Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Kernel-based Virtual Machine driver for Linux |
| 3 | * |
| 4 | * This module enables machines with Intel VT-x extensions to run virtual |
| 5 | * machines without emulation or binary translation. |
| 6 | * |
| 7 | * MMU support |
| 8 | * |
| 9 | * Copyright (C) 2006 Qumranet, Inc. |
Nicolas Kaiser | 9611c18 | 2010-10-06 14:23:22 +0200 | [diff] [blame] | 10 | * Copyright 2010 Red Hat, Inc. and/or its affiliates. |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 11 | * |
| 12 | * Authors: |
| 13 | * Yaniv Kamay <yaniv@qumranet.com> |
| 14 | * Avi Kivity <avi@qumranet.com> |
| 15 | * |
| 16 | * This work is licensed under the terms of the GNU GPL, version 2. See |
| 17 | * the COPYING file in the top-level directory. |
| 18 | * |
| 19 | */ |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 20 | |
Gleb Natapov | af585b9 | 2010-10-14 11:22:46 +0200 | [diff] [blame] | 21 | #include "irq.h" |
Zhang Xiantao | 1d737c8 | 2007-12-14 09:35:10 +0800 | [diff] [blame] | 22 | #include "mmu.h" |
Avi Kivity | 836a1b3 | 2010-01-21 15:31:49 +0200 | [diff] [blame] | 23 | #include "x86.h" |
Avi Kivity | 6de4f3a | 2009-05-31 22:58:47 +0300 | [diff] [blame] | 24 | #include "kvm_cache_regs.h" |
Nadav Amit | 5f7dde7 | 2014-05-07 15:32:50 +0300 | [diff] [blame] | 25 | #include "cpuid.h" |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 26 | |
Avi Kivity | edf8841 | 2007-12-16 11:02:48 +0200 | [diff] [blame] | 27 | #include <linux/kvm_host.h> |
Avi Kivity | e495606 | 2007-06-28 14:15:57 -0400 | [diff] [blame] | 28 | #include <linux/types.h> |
| 29 | #include <linux/string.h> |
| 30 | #include <linux/mm.h> |
| 31 | #include <linux/highmem.h> |
| 32 | #include <linux/module.h> |
Izik Eidus | 448353c | 2007-11-26 14:08:14 +0200 | [diff] [blame] | 33 | #include <linux/swap.h> |
Marcelo Tosatti | 05da455 | 2008-02-23 11:44:30 -0300 | [diff] [blame] | 34 | #include <linux/hugetlb.h> |
Marcelo Tosatti | 2f333bc | 2008-02-22 12:21:37 -0500 | [diff] [blame] | 35 | #include <linux/compiler.h> |
Marcelo Tosatti | bc6678a | 2009-12-23 14:35:21 -0200 | [diff] [blame] | 36 | #include <linux/srcu.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 37 | #include <linux/slab.h> |
Huang Ying | bf99815 | 2010-05-31 14:28:19 +0800 | [diff] [blame] | 38 | #include <linux/uaccess.h> |
Avi Kivity | e495606 | 2007-06-28 14:15:57 -0400 | [diff] [blame] | 39 | |
| 40 | #include <asm/page.h> |
| 41 | #include <asm/cmpxchg.h> |
Avi Kivity | 4e54237 | 2007-11-21 14:08:40 +0200 | [diff] [blame] | 42 | #include <asm/io.h> |
Eduardo Habkost | 13673a9 | 2008-11-17 19:03:13 -0200 | [diff] [blame] | 43 | #include <asm/vmx.h> |
Avi Kivity | e495606 | 2007-06-28 14:15:57 -0400 | [diff] [blame] | 44 | |
Joerg Roedel | 1855267 | 2008-02-07 13:47:41 +0100 | [diff] [blame] | 45 | /* |
| 46 | * When setting this variable to true it enables Two-Dimensional-Paging |
| 47 | * where the hardware walks 2 page tables: |
| 48 | * 1. the guest-virtual to guest-physical |
| 49 | * 2. while doing 1. it walks guest-physical to host-physical |
| 50 | * If the hardware supports that we don't need to do shadow paging. |
| 51 | */ |
Marcelo Tosatti | 2f333bc | 2008-02-22 12:21:37 -0500 | [diff] [blame] | 52 | bool tdp_enabled = false; |
Joerg Roedel | 1855267 | 2008-02-07 13:47:41 +0100 | [diff] [blame] | 53 | |
Xiao Guangrong | 8b1fe17 | 2010-08-30 18:22:53 +0800 | [diff] [blame] | 54 | enum { |
| 55 | AUDIT_PRE_PAGE_FAULT, |
| 56 | AUDIT_POST_PAGE_FAULT, |
| 57 | AUDIT_PRE_PTE_WRITE, |
Xiao Guangrong | 6903074 | 2010-09-27 18:09:29 +0800 | [diff] [blame] | 58 | AUDIT_POST_PTE_WRITE, |
| 59 | AUDIT_PRE_SYNC, |
| 60 | AUDIT_POST_SYNC |
Xiao Guangrong | 8b1fe17 | 2010-08-30 18:22:53 +0800 | [diff] [blame] | 61 | }; |
| 62 | |
Avi Kivity | 37a7d8b | 2007-01-05 16:36:56 -0800 | [diff] [blame] | 63 | #undef MMU_DEBUG |
| 64 | |
Avi Kivity | 37a7d8b | 2007-01-05 16:36:56 -0800 | [diff] [blame] | 65 | #ifdef MMU_DEBUG |
| 66 | |
| 67 | #define pgprintk(x...) do { if (dbg) printk(x); } while (0) |
| 68 | #define rmap_printk(x...) do { if (dbg) printk(x); } while (0) |
| 69 | |
| 70 | #else |
| 71 | |
| 72 | #define pgprintk(x...) do { } while (0) |
| 73 | #define rmap_printk(x...) do { } while (0) |
| 74 | |
| 75 | #endif |
| 76 | |
Xiao Guangrong | 8b1fe17 | 2010-08-30 18:22:53 +0800 | [diff] [blame] | 77 | #ifdef MMU_DEBUG |
Rusty Russell | 476bc00 | 2012-01-13 09:32:18 +1030 | [diff] [blame] | 78 | static bool dbg = 0; |
Avi Kivity | 6ada8cc | 2008-06-22 16:45:24 +0300 | [diff] [blame] | 79 | module_param(dbg, bool, 0644); |
Avi Kivity | 37a7d8b | 2007-01-05 16:36:56 -0800 | [diff] [blame] | 80 | #endif |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 81 | |
Yaozu Dong | d6c69ee | 2007-04-25 14:17:25 +0800 | [diff] [blame] | 82 | #ifndef MMU_DEBUG |
| 83 | #define ASSERT(x) do { } while (0) |
| 84 | #else |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 85 | #define ASSERT(x) \ |
| 86 | if (!(x)) { \ |
| 87 | printk(KERN_WARNING "assertion failed %s:%d: %s\n", \ |
| 88 | __FILE__, __LINE__, #x); \ |
| 89 | } |
Yaozu Dong | d6c69ee | 2007-04-25 14:17:25 +0800 | [diff] [blame] | 90 | #endif |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 91 | |
Xiao Guangrong | 957ed9e | 2010-08-22 19:12:48 +0800 | [diff] [blame] | 92 | #define PTE_PREFETCH_NUM 8 |
| 93 | |
Xudong Hao | 00763e4 | 2012-06-07 18:26:07 +0800 | [diff] [blame] | 94 | #define PT_FIRST_AVAIL_BITS_SHIFT 10 |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 95 | #define PT64_SECOND_AVAIL_BITS_SHIFT 52 |
| 96 | |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 97 | #define PT64_LEVEL_BITS 9 |
| 98 | |
| 99 | #define PT64_LEVEL_SHIFT(level) \ |
Mike Day | d77c26f | 2007-10-08 09:02:08 -0400 | [diff] [blame] | 100 | (PAGE_SHIFT + (level - 1) * PT64_LEVEL_BITS) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 101 | |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 102 | #define PT64_INDEX(address, level)\ |
| 103 | (((address) >> PT64_LEVEL_SHIFT(level)) & ((1 << PT64_LEVEL_BITS) - 1)) |
| 104 | |
| 105 | |
| 106 | #define PT32_LEVEL_BITS 10 |
| 107 | |
| 108 | #define PT32_LEVEL_SHIFT(level) \ |
Mike Day | d77c26f | 2007-10-08 09:02:08 -0400 | [diff] [blame] | 109 | (PAGE_SHIFT + (level - 1) * PT32_LEVEL_BITS) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 110 | |
Joerg Roedel | e04da98 | 2009-07-27 16:30:45 +0200 | [diff] [blame] | 111 | #define PT32_LVL_OFFSET_MASK(level) \ |
| 112 | (PT32_BASE_ADDR_MASK & ((1ULL << (PAGE_SHIFT + (((level) - 1) \ |
| 113 | * PT32_LEVEL_BITS))) - 1)) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 114 | |
| 115 | #define PT32_INDEX(address, level)\ |
| 116 | (((address) >> PT32_LEVEL_SHIFT(level)) & ((1 << PT32_LEVEL_BITS) - 1)) |
| 117 | |
| 118 | |
Avi Kivity | 27aba76 | 2007-03-09 13:04:31 +0200 | [diff] [blame] | 119 | #define PT64_BASE_ADDR_MASK (((1ULL << 52) - 1) & ~(u64)(PAGE_SIZE-1)) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 120 | #define PT64_DIR_BASE_ADDR_MASK \ |
| 121 | (PT64_BASE_ADDR_MASK & ~((1ULL << (PAGE_SHIFT + PT64_LEVEL_BITS)) - 1)) |
Joerg Roedel | e04da98 | 2009-07-27 16:30:45 +0200 | [diff] [blame] | 122 | #define PT64_LVL_ADDR_MASK(level) \ |
| 123 | (PT64_BASE_ADDR_MASK & ~((1ULL << (PAGE_SHIFT + (((level) - 1) \ |
| 124 | * PT64_LEVEL_BITS))) - 1)) |
| 125 | #define PT64_LVL_OFFSET_MASK(level) \ |
| 126 | (PT64_BASE_ADDR_MASK & ((1ULL << (PAGE_SHIFT + (((level) - 1) \ |
| 127 | * PT64_LEVEL_BITS))) - 1)) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 128 | |
| 129 | #define PT32_BASE_ADDR_MASK PAGE_MASK |
| 130 | #define PT32_DIR_BASE_ADDR_MASK \ |
| 131 | (PAGE_MASK & ~((1ULL << (PAGE_SHIFT + PT32_LEVEL_BITS)) - 1)) |
Joerg Roedel | e04da98 | 2009-07-27 16:30:45 +0200 | [diff] [blame] | 132 | #define PT32_LVL_ADDR_MASK(level) \ |
| 133 | (PAGE_MASK & ~((1ULL << (PAGE_SHIFT + (((level) - 1) \ |
| 134 | * PT32_LEVEL_BITS))) - 1)) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 135 | |
Gleb Natapov | 5316622 | 2013-08-05 11:07:14 +0300 | [diff] [blame] | 136 | #define PT64_PERM_MASK (PT_PRESENT_MASK | PT_WRITABLE_MASK | shadow_user_mask \ |
| 137 | | shadow_x_mask | shadow_nx_mask) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 138 | |
Avi Kivity | fe135d2 | 2007-12-09 16:15:46 +0200 | [diff] [blame] | 139 | #define ACC_EXEC_MASK 1 |
| 140 | #define ACC_WRITE_MASK PT_WRITABLE_MASK |
| 141 | #define ACC_USER_MASK PT_USER_MASK |
| 142 | #define ACC_ALL (ACC_EXEC_MASK | ACC_WRITE_MASK | ACC_USER_MASK) |
| 143 | |
Avi Kivity | 90bb6fc | 2009-12-31 12:10:16 +0200 | [diff] [blame] | 144 | #include <trace/events/kvm.h> |
| 145 | |
Avi Kivity | 0742017 | 2009-07-06 12:21:32 +0300 | [diff] [blame] | 146 | #define CREATE_TRACE_POINTS |
| 147 | #include "mmutrace.h" |
| 148 | |
Xiao Guangrong | 49fde34 | 2012-06-20 15:58:58 +0800 | [diff] [blame] | 149 | #define SPTE_HOST_WRITEABLE (1ULL << PT_FIRST_AVAIL_BITS_SHIFT) |
| 150 | #define SPTE_MMU_WRITEABLE (1ULL << (PT_FIRST_AVAIL_BITS_SHIFT + 1)) |
Izik Eidus | 1403283 | 2009-09-23 21:47:17 +0300 | [diff] [blame] | 151 | |
Avi Kivity | 135f8c2 | 2008-08-21 17:49:56 +0300 | [diff] [blame] | 152 | #define SHADOW_PT_INDEX(addr, level) PT64_INDEX(addr, level) |
| 153 | |
Takuya Yoshikawa | 220f773 | 2012-03-21 23:49:39 +0900 | [diff] [blame] | 154 | /* make pte_list_desc fit well in cache line */ |
| 155 | #define PTE_LIST_EXT 3 |
| 156 | |
Xiao Guangrong | 53c07b1 | 2011-05-15 23:26:20 +0800 | [diff] [blame] | 157 | struct pte_list_desc { |
| 158 | u64 *sptes[PTE_LIST_EXT]; |
| 159 | struct pte_list_desc *more; |
Avi Kivity | cd4a4e5 | 2007-01-05 16:36:38 -0800 | [diff] [blame] | 160 | }; |
| 161 | |
Avi Kivity | 2d11123 | 2008-12-25 14:39:47 +0200 | [diff] [blame] | 162 | struct kvm_shadow_walk_iterator { |
| 163 | u64 addr; |
| 164 | hpa_t shadow_addr; |
Avi Kivity | 2d11123 | 2008-12-25 14:39:47 +0200 | [diff] [blame] | 165 | u64 *sptep; |
Xiao Guangrong | dd3bfd5 | 2011-07-12 03:32:54 +0800 | [diff] [blame] | 166 | int level; |
Avi Kivity | 2d11123 | 2008-12-25 14:39:47 +0200 | [diff] [blame] | 167 | unsigned index; |
| 168 | }; |
| 169 | |
| 170 | #define for_each_shadow_entry(_vcpu, _addr, _walker) \ |
| 171 | for (shadow_walk_init(&(_walker), _vcpu, _addr); \ |
| 172 | shadow_walk_okay(&(_walker)); \ |
| 173 | shadow_walk_next(&(_walker))) |
| 174 | |
Xiao Guangrong | c2a2ac2 | 2011-07-12 03:32:13 +0800 | [diff] [blame] | 175 | #define for_each_shadow_entry_lockless(_vcpu, _addr, _walker, spte) \ |
| 176 | for (shadow_walk_init(&(_walker), _vcpu, _addr); \ |
| 177 | shadow_walk_okay(&(_walker)) && \ |
| 178 | ({ spte = mmu_spte_get_lockless(_walker.sptep); 1; }); \ |
| 179 | __shadow_walk_next(&(_walker), spte)) |
| 180 | |
Xiao Guangrong | 53c07b1 | 2011-05-15 23:26:20 +0800 | [diff] [blame] | 181 | static struct kmem_cache *pte_list_desc_cache; |
Avi Kivity | d3d25b0 | 2007-05-30 12:34:53 +0300 | [diff] [blame] | 182 | static struct kmem_cache *mmu_page_header_cache; |
Dave Hansen | 45221ab | 2010-08-19 18:11:37 -0700 | [diff] [blame] | 183 | static struct percpu_counter kvm_total_used_mmu_pages; |
Avi Kivity | b5a33a7 | 2007-04-15 16:31:09 +0300 | [diff] [blame] | 184 | |
Sheng Yang | 7b52345 | 2008-04-25 21:13:50 +0800 | [diff] [blame] | 185 | static u64 __read_mostly shadow_nx_mask; |
| 186 | static u64 __read_mostly shadow_x_mask; /* mutual exclusive with nx_mask */ |
| 187 | static u64 __read_mostly shadow_user_mask; |
| 188 | static u64 __read_mostly shadow_accessed_mask; |
| 189 | static u64 __read_mostly shadow_dirty_mask; |
Xiao Guangrong | ce88dec | 2011-07-12 03:33:44 +0800 | [diff] [blame] | 190 | static u64 __read_mostly shadow_mmio_mask; |
| 191 | |
| 192 | static void mmu_spte_set(u64 *sptep, u64 spte); |
Avi Kivity | e676505 | 2012-07-08 17:16:30 +0300 | [diff] [blame] | 193 | static void mmu_free_roots(struct kvm_vcpu *vcpu); |
Xiao Guangrong | ce88dec | 2011-07-12 03:33:44 +0800 | [diff] [blame] | 194 | |
| 195 | void kvm_mmu_set_mmio_spte_mask(u64 mmio_mask) |
| 196 | { |
| 197 | shadow_mmio_mask = mmio_mask; |
| 198 | } |
| 199 | EXPORT_SYMBOL_GPL(kvm_mmu_set_mmio_spte_mask); |
| 200 | |
Xiao Guangrong | f2fd125 | 2013-06-07 16:51:24 +0800 | [diff] [blame] | 201 | /* |
| 202 | * spte bits of bit 3 ~ bit 11 are used as low 9 bits of generation number, |
| 203 | * the bits of bits 52 ~ bit 61 are used as high 10 bits of generation |
| 204 | * number. |
| 205 | */ |
| 206 | #define MMIO_SPTE_GEN_LOW_SHIFT 3 |
| 207 | #define MMIO_SPTE_GEN_HIGH_SHIFT 52 |
| 208 | |
Xiao Guangrong | f8f5594 | 2013-06-07 16:51:26 +0800 | [diff] [blame] | 209 | #define MMIO_GEN_SHIFT 19 |
Xiao Guangrong | f2fd125 | 2013-06-07 16:51:24 +0800 | [diff] [blame] | 210 | #define MMIO_GEN_LOW_SHIFT 9 |
| 211 | #define MMIO_GEN_LOW_MASK ((1 << MMIO_GEN_LOW_SHIFT) - 1) |
Xiao Guangrong | f8f5594 | 2013-06-07 16:51:26 +0800 | [diff] [blame] | 212 | #define MMIO_GEN_MASK ((1 << MMIO_GEN_SHIFT) - 1) |
| 213 | #define MMIO_MAX_GEN ((1 << MMIO_GEN_SHIFT) - 1) |
Xiao Guangrong | f2fd125 | 2013-06-07 16:51:24 +0800 | [diff] [blame] | 214 | |
| 215 | static u64 generation_mmio_spte_mask(unsigned int gen) |
| 216 | { |
| 217 | u64 mask; |
| 218 | |
| 219 | WARN_ON(gen > MMIO_MAX_GEN); |
| 220 | |
| 221 | mask = (gen & MMIO_GEN_LOW_MASK) << MMIO_SPTE_GEN_LOW_SHIFT; |
| 222 | mask |= ((u64)gen >> MMIO_GEN_LOW_SHIFT) << MMIO_SPTE_GEN_HIGH_SHIFT; |
| 223 | return mask; |
| 224 | } |
| 225 | |
| 226 | static unsigned int get_mmio_spte_generation(u64 spte) |
| 227 | { |
| 228 | unsigned int gen; |
| 229 | |
| 230 | spte &= ~shadow_mmio_mask; |
| 231 | |
| 232 | gen = (spte >> MMIO_SPTE_GEN_LOW_SHIFT) & MMIO_GEN_LOW_MASK; |
| 233 | gen |= (spte >> MMIO_SPTE_GEN_HIGH_SHIFT) << MMIO_GEN_LOW_SHIFT; |
| 234 | return gen; |
| 235 | } |
| 236 | |
Xiao Guangrong | f8f5594 | 2013-06-07 16:51:26 +0800 | [diff] [blame] | 237 | static unsigned int kvm_current_mmio_generation(struct kvm *kvm) |
| 238 | { |
Paolo Bonzini | 00f034a | 2014-08-20 14:29:21 +0200 | [diff] [blame^] | 239 | return kvm_memslots(kvm)->generation & MMIO_GEN_MASK; |
Xiao Guangrong | f8f5594 | 2013-06-07 16:51:26 +0800 | [diff] [blame] | 240 | } |
| 241 | |
Xiao Guangrong | f2fd125 | 2013-06-07 16:51:24 +0800 | [diff] [blame] | 242 | static void mark_mmio_spte(struct kvm *kvm, u64 *sptep, u64 gfn, |
| 243 | unsigned access) |
Xiao Guangrong | ce88dec | 2011-07-12 03:33:44 +0800 | [diff] [blame] | 244 | { |
Xiao Guangrong | f8f5594 | 2013-06-07 16:51:26 +0800 | [diff] [blame] | 245 | unsigned int gen = kvm_current_mmio_generation(kvm); |
| 246 | u64 mask = generation_mmio_spte_mask(gen); |
Takuya Yoshikawa | 95b0430 | 2013-03-12 17:44:40 +0900 | [diff] [blame] | 247 | |
Xiao Guangrong | ce88dec | 2011-07-12 03:33:44 +0800 | [diff] [blame] | 248 | access &= ACC_WRITE_MASK | ACC_USER_MASK; |
Xiao Guangrong | f2fd125 | 2013-06-07 16:51:24 +0800 | [diff] [blame] | 249 | mask |= shadow_mmio_mask | access | gfn << PAGE_SHIFT; |
Xiao Guangrong | f2fd125 | 2013-06-07 16:51:24 +0800 | [diff] [blame] | 250 | |
Xiao Guangrong | f8f5594 | 2013-06-07 16:51:26 +0800 | [diff] [blame] | 251 | trace_mark_mmio_spte(sptep, gfn, access, gen); |
Xiao Guangrong | f2fd125 | 2013-06-07 16:51:24 +0800 | [diff] [blame] | 252 | mmu_spte_set(sptep, mask); |
Xiao Guangrong | ce88dec | 2011-07-12 03:33:44 +0800 | [diff] [blame] | 253 | } |
| 254 | |
| 255 | static bool is_mmio_spte(u64 spte) |
| 256 | { |
| 257 | return (spte & shadow_mmio_mask) == shadow_mmio_mask; |
| 258 | } |
| 259 | |
| 260 | static gfn_t get_mmio_spte_gfn(u64 spte) |
| 261 | { |
Xiao Guangrong | f2fd125 | 2013-06-07 16:51:24 +0800 | [diff] [blame] | 262 | u64 mask = generation_mmio_spte_mask(MMIO_MAX_GEN) | shadow_mmio_mask; |
| 263 | return (spte & ~mask) >> PAGE_SHIFT; |
Xiao Guangrong | ce88dec | 2011-07-12 03:33:44 +0800 | [diff] [blame] | 264 | } |
| 265 | |
| 266 | static unsigned get_mmio_spte_access(u64 spte) |
| 267 | { |
Xiao Guangrong | f2fd125 | 2013-06-07 16:51:24 +0800 | [diff] [blame] | 268 | u64 mask = generation_mmio_spte_mask(MMIO_MAX_GEN) | shadow_mmio_mask; |
| 269 | return (spte & ~mask) & ~PAGE_MASK; |
Xiao Guangrong | ce88dec | 2011-07-12 03:33:44 +0800 | [diff] [blame] | 270 | } |
| 271 | |
Xiao Guangrong | f2fd125 | 2013-06-07 16:51:24 +0800 | [diff] [blame] | 272 | static bool set_mmio_spte(struct kvm *kvm, u64 *sptep, gfn_t gfn, |
| 273 | pfn_t pfn, unsigned access) |
Xiao Guangrong | ce88dec | 2011-07-12 03:33:44 +0800 | [diff] [blame] | 274 | { |
| 275 | if (unlikely(is_noslot_pfn(pfn))) { |
Xiao Guangrong | f2fd125 | 2013-06-07 16:51:24 +0800 | [diff] [blame] | 276 | mark_mmio_spte(kvm, sptep, gfn, access); |
Xiao Guangrong | ce88dec | 2011-07-12 03:33:44 +0800 | [diff] [blame] | 277 | return true; |
| 278 | } |
| 279 | |
| 280 | return false; |
| 281 | } |
Avi Kivity | c7addb9 | 2007-09-16 18:58:32 +0200 | [diff] [blame] | 282 | |
Xiao Guangrong | f8f5594 | 2013-06-07 16:51:26 +0800 | [diff] [blame] | 283 | static bool check_mmio_spte(struct kvm *kvm, u64 spte) |
| 284 | { |
Xiao Guangrong | 089504c | 2013-06-07 16:51:27 +0800 | [diff] [blame] | 285 | unsigned int kvm_gen, spte_gen; |
| 286 | |
| 287 | kvm_gen = kvm_current_mmio_generation(kvm); |
| 288 | spte_gen = get_mmio_spte_generation(spte); |
| 289 | |
| 290 | trace_check_mmio_spte(spte, kvm_gen, spte_gen); |
| 291 | return likely(kvm_gen == spte_gen); |
Xiao Guangrong | f8f5594 | 2013-06-07 16:51:26 +0800 | [diff] [blame] | 292 | } |
| 293 | |
Dong, Eddie | 82725b2 | 2009-03-30 16:21:08 +0800 | [diff] [blame] | 294 | static inline u64 rsvd_bits(int s, int e) |
| 295 | { |
| 296 | return ((1ULL << (e - s + 1)) - 1) << s; |
| 297 | } |
| 298 | |
Sheng Yang | 7b52345 | 2008-04-25 21:13:50 +0800 | [diff] [blame] | 299 | void kvm_mmu_set_mask_ptes(u64 user_mask, u64 accessed_mask, |
Sheng Yang | 4b12f0d | 2009-04-27 20:35:42 +0800 | [diff] [blame] | 300 | u64 dirty_mask, u64 nx_mask, u64 x_mask) |
Sheng Yang | 7b52345 | 2008-04-25 21:13:50 +0800 | [diff] [blame] | 301 | { |
| 302 | shadow_user_mask = user_mask; |
| 303 | shadow_accessed_mask = accessed_mask; |
| 304 | shadow_dirty_mask = dirty_mask; |
| 305 | shadow_nx_mask = nx_mask; |
| 306 | shadow_x_mask = x_mask; |
| 307 | } |
| 308 | EXPORT_SYMBOL_GPL(kvm_mmu_set_mask_ptes); |
| 309 | |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 310 | static int is_cpuid_PSE36(void) |
| 311 | { |
| 312 | return 1; |
| 313 | } |
| 314 | |
Avi Kivity | 73b1087 | 2007-01-26 00:56:41 -0800 | [diff] [blame] | 315 | static int is_nx(struct kvm_vcpu *vcpu) |
| 316 | { |
Avi Kivity | f6801df | 2010-01-21 15:31:50 +0200 | [diff] [blame] | 317 | return vcpu->arch.efer & EFER_NX; |
Avi Kivity | 73b1087 | 2007-01-26 00:56:41 -0800 | [diff] [blame] | 318 | } |
| 319 | |
Avi Kivity | c7addb9 | 2007-09-16 18:58:32 +0200 | [diff] [blame] | 320 | static int is_shadow_present_pte(u64 pte) |
| 321 | { |
Xiao Guangrong | ce88dec | 2011-07-12 03:33:44 +0800 | [diff] [blame] | 322 | return pte & PT_PRESENT_MASK && !is_mmio_spte(pte); |
Avi Kivity | c7addb9 | 2007-09-16 18:58:32 +0200 | [diff] [blame] | 323 | } |
| 324 | |
Marcelo Tosatti | 05da455 | 2008-02-23 11:44:30 -0300 | [diff] [blame] | 325 | static int is_large_pte(u64 pte) |
| 326 | { |
| 327 | return pte & PT_PAGE_SIZE_MASK; |
| 328 | } |
| 329 | |
Avi Kivity | 43a3795 | 2009-06-10 14:12:05 +0300 | [diff] [blame] | 330 | static int is_rmap_spte(u64 pte) |
Avi Kivity | cd4a4e5 | 2007-01-05 16:36:38 -0800 | [diff] [blame] | 331 | { |
Avi Kivity | 4b1a80f | 2008-03-23 12:18:19 +0200 | [diff] [blame] | 332 | return is_shadow_present_pte(pte); |
Avi Kivity | cd4a4e5 | 2007-01-05 16:36:38 -0800 | [diff] [blame] | 333 | } |
| 334 | |
Marcelo Tosatti | 776e663 | 2009-06-10 12:27:03 -0300 | [diff] [blame] | 335 | static int is_last_spte(u64 pte, int level) |
| 336 | { |
| 337 | if (level == PT_PAGE_TABLE_LEVEL) |
| 338 | return 1; |
Joerg Roedel | 852e3c1 | 2009-07-27 16:30:44 +0200 | [diff] [blame] | 339 | if (is_large_pte(pte)) |
Marcelo Tosatti | 776e663 | 2009-06-10 12:27:03 -0300 | [diff] [blame] | 340 | return 1; |
| 341 | return 0; |
| 342 | } |
| 343 | |
Anthony Liguori | 35149e2 | 2008-04-02 14:46:56 -0500 | [diff] [blame] | 344 | static pfn_t spte_to_pfn(u64 pte) |
Avi Kivity | 0b49ea8 | 2008-03-23 15:06:23 +0200 | [diff] [blame] | 345 | { |
Anthony Liguori | 35149e2 | 2008-04-02 14:46:56 -0500 | [diff] [blame] | 346 | return (pte & PT64_BASE_ADDR_MASK) >> PAGE_SHIFT; |
Avi Kivity | 0b49ea8 | 2008-03-23 15:06:23 +0200 | [diff] [blame] | 347 | } |
| 348 | |
Avi Kivity | da92852 | 2007-11-21 13:54:47 +0200 | [diff] [blame] | 349 | static gfn_t pse36_gfn_delta(u32 gpte) |
| 350 | { |
| 351 | int shift = 32 - PT32_DIR_PSE36_SHIFT - PAGE_SHIFT; |
| 352 | |
| 353 | return (gpte & PT32_DIR_PSE36_MASK) << shift; |
| 354 | } |
| 355 | |
Xiao Guangrong | 603e065 | 2011-07-12 03:31:28 +0800 | [diff] [blame] | 356 | #ifdef CONFIG_X86_64 |
Avi Kivity | d555c33 | 2009-06-10 14:24:23 +0300 | [diff] [blame] | 357 | static void __set_spte(u64 *sptep, u64 spte) |
Avi Kivity | e663ee6 | 2007-05-31 15:46:04 +0300 | [diff] [blame] | 358 | { |
Xiao Guangrong | 603e065 | 2011-07-12 03:31:28 +0800 | [diff] [blame] | 359 | *sptep = spte; |
Avi Kivity | e663ee6 | 2007-05-31 15:46:04 +0300 | [diff] [blame] | 360 | } |
| 361 | |
Xiao Guangrong | 603e065 | 2011-07-12 03:31:28 +0800 | [diff] [blame] | 362 | static void __update_clear_spte_fast(u64 *sptep, u64 spte) |
Avi Kivity | a9221dd | 2010-06-06 14:48:06 +0300 | [diff] [blame] | 363 | { |
Xiao Guangrong | 603e065 | 2011-07-12 03:31:28 +0800 | [diff] [blame] | 364 | *sptep = spte; |
Avi Kivity | a9221dd | 2010-06-06 14:48:06 +0300 | [diff] [blame] | 365 | } |
| 366 | |
Xiao Guangrong | 603e065 | 2011-07-12 03:31:28 +0800 | [diff] [blame] | 367 | static u64 __update_clear_spte_slow(u64 *sptep, u64 spte) |
| 368 | { |
| 369 | return xchg(sptep, spte); |
| 370 | } |
Xiao Guangrong | c2a2ac2 | 2011-07-12 03:32:13 +0800 | [diff] [blame] | 371 | |
| 372 | static u64 __get_spte_lockless(u64 *sptep) |
| 373 | { |
| 374 | return ACCESS_ONCE(*sptep); |
| 375 | } |
Xiao Guangrong | ce88dec | 2011-07-12 03:33:44 +0800 | [diff] [blame] | 376 | |
| 377 | static bool __check_direct_spte_mmio_pf(u64 spte) |
| 378 | { |
| 379 | /* It is valid if the spte is zapped. */ |
| 380 | return spte == 0ull; |
| 381 | } |
Xiao Guangrong | 603e065 | 2011-07-12 03:31:28 +0800 | [diff] [blame] | 382 | #else |
| 383 | union split_spte { |
| 384 | struct { |
| 385 | u32 spte_low; |
| 386 | u32 spte_high; |
| 387 | }; |
| 388 | u64 spte; |
| 389 | }; |
| 390 | |
Xiao Guangrong | c2a2ac2 | 2011-07-12 03:32:13 +0800 | [diff] [blame] | 391 | static void count_spte_clear(u64 *sptep, u64 spte) |
| 392 | { |
| 393 | struct kvm_mmu_page *sp = page_header(__pa(sptep)); |
| 394 | |
| 395 | if (is_shadow_present_pte(spte)) |
| 396 | return; |
| 397 | |
| 398 | /* Ensure the spte is completely set before we increase the count */ |
| 399 | smp_wmb(); |
| 400 | sp->clear_spte_count++; |
| 401 | } |
| 402 | |
Xiao Guangrong | 603e065 | 2011-07-12 03:31:28 +0800 | [diff] [blame] | 403 | static void __set_spte(u64 *sptep, u64 spte) |
| 404 | { |
| 405 | union split_spte *ssptep, sspte; |
| 406 | |
| 407 | ssptep = (union split_spte *)sptep; |
| 408 | sspte = (union split_spte)spte; |
| 409 | |
| 410 | ssptep->spte_high = sspte.spte_high; |
| 411 | |
| 412 | /* |
| 413 | * If we map the spte from nonpresent to present, We should store |
| 414 | * the high bits firstly, then set present bit, so cpu can not |
| 415 | * fetch this spte while we are setting the spte. |
| 416 | */ |
| 417 | smp_wmb(); |
| 418 | |
| 419 | ssptep->spte_low = sspte.spte_low; |
| 420 | } |
| 421 | |
| 422 | static void __update_clear_spte_fast(u64 *sptep, u64 spte) |
| 423 | { |
| 424 | union split_spte *ssptep, sspte; |
| 425 | |
| 426 | ssptep = (union split_spte *)sptep; |
| 427 | sspte = (union split_spte)spte; |
| 428 | |
| 429 | ssptep->spte_low = sspte.spte_low; |
| 430 | |
| 431 | /* |
| 432 | * If we map the spte from present to nonpresent, we should clear |
| 433 | * present bit firstly to avoid vcpu fetch the old high bits. |
| 434 | */ |
| 435 | smp_wmb(); |
| 436 | |
| 437 | ssptep->spte_high = sspte.spte_high; |
Xiao Guangrong | c2a2ac2 | 2011-07-12 03:32:13 +0800 | [diff] [blame] | 438 | count_spte_clear(sptep, spte); |
Xiao Guangrong | 603e065 | 2011-07-12 03:31:28 +0800 | [diff] [blame] | 439 | } |
| 440 | |
| 441 | static u64 __update_clear_spte_slow(u64 *sptep, u64 spte) |
| 442 | { |
| 443 | union split_spte *ssptep, sspte, orig; |
| 444 | |
| 445 | ssptep = (union split_spte *)sptep; |
| 446 | sspte = (union split_spte)spte; |
| 447 | |
| 448 | /* xchg acts as a barrier before the setting of the high bits */ |
| 449 | orig.spte_low = xchg(&ssptep->spte_low, sspte.spte_low); |
Zhao Jin | 41bc318 | 2011-09-19 12:19:51 +0800 | [diff] [blame] | 450 | orig.spte_high = ssptep->spte_high; |
| 451 | ssptep->spte_high = sspte.spte_high; |
Xiao Guangrong | c2a2ac2 | 2011-07-12 03:32:13 +0800 | [diff] [blame] | 452 | count_spte_clear(sptep, spte); |
Xiao Guangrong | 603e065 | 2011-07-12 03:31:28 +0800 | [diff] [blame] | 453 | |
| 454 | return orig.spte; |
| 455 | } |
Xiao Guangrong | c2a2ac2 | 2011-07-12 03:32:13 +0800 | [diff] [blame] | 456 | |
| 457 | /* |
| 458 | * The idea using the light way get the spte on x86_32 guest is from |
| 459 | * gup_get_pte(arch/x86/mm/gup.c). |
Xiao Guangrong | accaefe | 2013-06-19 17:09:20 +0800 | [diff] [blame] | 460 | * |
| 461 | * An spte tlb flush may be pending, because kvm_set_pte_rmapp |
| 462 | * coalesces them and we are running out of the MMU lock. Therefore |
| 463 | * we need to protect against in-progress updates of the spte. |
| 464 | * |
| 465 | * Reading the spte while an update is in progress may get the old value |
| 466 | * for the high part of the spte. The race is fine for a present->non-present |
| 467 | * change (because the high part of the spte is ignored for non-present spte), |
| 468 | * but for a present->present change we must reread the spte. |
| 469 | * |
| 470 | * All such changes are done in two steps (present->non-present and |
| 471 | * non-present->present), hence it is enough to count the number of |
| 472 | * present->non-present updates: if it changed while reading the spte, |
| 473 | * we might have hit the race. This is done using clear_spte_count. |
Xiao Guangrong | c2a2ac2 | 2011-07-12 03:32:13 +0800 | [diff] [blame] | 474 | */ |
| 475 | static u64 __get_spte_lockless(u64 *sptep) |
| 476 | { |
| 477 | struct kvm_mmu_page *sp = page_header(__pa(sptep)); |
| 478 | union split_spte spte, *orig = (union split_spte *)sptep; |
| 479 | int count; |
| 480 | |
| 481 | retry: |
| 482 | count = sp->clear_spte_count; |
| 483 | smp_rmb(); |
| 484 | |
| 485 | spte.spte_low = orig->spte_low; |
| 486 | smp_rmb(); |
| 487 | |
| 488 | spte.spte_high = orig->spte_high; |
| 489 | smp_rmb(); |
| 490 | |
| 491 | if (unlikely(spte.spte_low != orig->spte_low || |
| 492 | count != sp->clear_spte_count)) |
| 493 | goto retry; |
| 494 | |
| 495 | return spte.spte; |
| 496 | } |
Xiao Guangrong | ce88dec | 2011-07-12 03:33:44 +0800 | [diff] [blame] | 497 | |
| 498 | static bool __check_direct_spte_mmio_pf(u64 spte) |
| 499 | { |
| 500 | union split_spte sspte = (union split_spte)spte; |
| 501 | u32 high_mmio_mask = shadow_mmio_mask >> 32; |
| 502 | |
| 503 | /* It is valid if the spte is zapped. */ |
| 504 | if (spte == 0ull) |
| 505 | return true; |
| 506 | |
| 507 | /* It is valid if the spte is being zapped. */ |
| 508 | if (sspte.spte_low == 0ull && |
| 509 | (sspte.spte_high & high_mmio_mask) == high_mmio_mask) |
| 510 | return true; |
| 511 | |
| 512 | return false; |
| 513 | } |
Xiao Guangrong | 603e065 | 2011-07-12 03:31:28 +0800 | [diff] [blame] | 514 | #endif |
| 515 | |
Xiao Guangrong | c7ba5b4 | 2012-06-20 15:59:18 +0800 | [diff] [blame] | 516 | static bool spte_is_locklessly_modifiable(u64 spte) |
| 517 | { |
Gleb Natapov | feb3eb7 | 2013-01-30 16:45:00 +0200 | [diff] [blame] | 518 | return (spte & (SPTE_HOST_WRITEABLE | SPTE_MMU_WRITEABLE)) == |
| 519 | (SPTE_HOST_WRITEABLE | SPTE_MMU_WRITEABLE); |
Xiao Guangrong | c7ba5b4 | 2012-06-20 15:59:18 +0800 | [diff] [blame] | 520 | } |
| 521 | |
Xiao Guangrong | 8672b72 | 2010-08-02 16:14:04 +0800 | [diff] [blame] | 522 | static bool spte_has_volatile_bits(u64 spte) |
| 523 | { |
Xiao Guangrong | c7ba5b4 | 2012-06-20 15:59:18 +0800 | [diff] [blame] | 524 | /* |
| 525 | * Always atomicly update spte if it can be updated |
| 526 | * out of mmu-lock, it can ensure dirty bit is not lost, |
| 527 | * also, it can help us to get a stable is_writable_pte() |
| 528 | * to ensure tlb flush is not missed. |
| 529 | */ |
| 530 | if (spte_is_locklessly_modifiable(spte)) |
| 531 | return true; |
| 532 | |
Xiao Guangrong | 8672b72 | 2010-08-02 16:14:04 +0800 | [diff] [blame] | 533 | if (!shadow_accessed_mask) |
| 534 | return false; |
| 535 | |
| 536 | if (!is_shadow_present_pte(spte)) |
| 537 | return false; |
| 538 | |
Xiao Guangrong | 4132779 | 2010-08-02 16:15:08 +0800 | [diff] [blame] | 539 | if ((spte & shadow_accessed_mask) && |
| 540 | (!is_writable_pte(spte) || (spte & shadow_dirty_mask))) |
Xiao Guangrong | 8672b72 | 2010-08-02 16:14:04 +0800 | [diff] [blame] | 541 | return false; |
| 542 | |
| 543 | return true; |
| 544 | } |
| 545 | |
Xiao Guangrong | 4132779 | 2010-08-02 16:15:08 +0800 | [diff] [blame] | 546 | static bool spte_is_bit_cleared(u64 old_spte, u64 new_spte, u64 bit_mask) |
| 547 | { |
| 548 | return (old_spte & bit_mask) && !(new_spte & bit_mask); |
| 549 | } |
| 550 | |
Xiao Guangrong | 1df9f2d | 2011-07-12 03:30:35 +0800 | [diff] [blame] | 551 | /* Rules for using mmu_spte_set: |
| 552 | * Set the sptep from nonpresent to present. |
| 553 | * Note: the sptep being assigned *must* be either not present |
| 554 | * or in a state where the hardware will not attempt to update |
| 555 | * the spte. |
| 556 | */ |
| 557 | static void mmu_spte_set(u64 *sptep, u64 new_spte) |
| 558 | { |
| 559 | WARN_ON(is_shadow_present_pte(*sptep)); |
| 560 | __set_spte(sptep, new_spte); |
| 561 | } |
| 562 | |
| 563 | /* Rules for using mmu_spte_update: |
| 564 | * Update the state bits, it means the mapped pfn is not changged. |
Xiao Guangrong | 6e7d035 | 2012-06-20 15:58:33 +0800 | [diff] [blame] | 565 | * |
| 566 | * Whenever we overwrite a writable spte with a read-only one we |
| 567 | * should flush remote TLBs. Otherwise rmap_write_protect |
| 568 | * will find a read-only spte, even though the writable spte |
| 569 | * might be cached on a CPU's TLB, the return value indicates this |
| 570 | * case. |
Xiao Guangrong | 1df9f2d | 2011-07-12 03:30:35 +0800 | [diff] [blame] | 571 | */ |
Xiao Guangrong | 6e7d035 | 2012-06-20 15:58:33 +0800 | [diff] [blame] | 572 | static bool mmu_spte_update(u64 *sptep, u64 new_spte) |
Avi Kivity | b79b93f | 2010-06-06 15:46:44 +0300 | [diff] [blame] | 573 | { |
Xiao Guangrong | c7ba5b4 | 2012-06-20 15:59:18 +0800 | [diff] [blame] | 574 | u64 old_spte = *sptep; |
Xiao Guangrong | 6e7d035 | 2012-06-20 15:58:33 +0800 | [diff] [blame] | 575 | bool ret = false; |
Avi Kivity | b79b93f | 2010-06-06 15:46:44 +0300 | [diff] [blame] | 576 | |
Xiao Guangrong | 4132779 | 2010-08-02 16:15:08 +0800 | [diff] [blame] | 577 | WARN_ON(!is_rmap_spte(new_spte)); |
| 578 | |
Xiao Guangrong | 6e7d035 | 2012-06-20 15:58:33 +0800 | [diff] [blame] | 579 | if (!is_shadow_present_pte(old_spte)) { |
| 580 | mmu_spte_set(sptep, new_spte); |
| 581 | return ret; |
| 582 | } |
Xiao Guangrong | 1df9f2d | 2011-07-12 03:30:35 +0800 | [diff] [blame] | 583 | |
Xiao Guangrong | c7ba5b4 | 2012-06-20 15:59:18 +0800 | [diff] [blame] | 584 | if (!spte_has_volatile_bits(old_spte)) |
Xiao Guangrong | 603e065 | 2011-07-12 03:31:28 +0800 | [diff] [blame] | 585 | __update_clear_spte_fast(sptep, new_spte); |
Xiao Guangrong | 4132779 | 2010-08-02 16:15:08 +0800 | [diff] [blame] | 586 | else |
Xiao Guangrong | 603e065 | 2011-07-12 03:31:28 +0800 | [diff] [blame] | 587 | old_spte = __update_clear_spte_slow(sptep, new_spte); |
Xiao Guangrong | 4132779 | 2010-08-02 16:15:08 +0800 | [diff] [blame] | 588 | |
Xiao Guangrong | c7ba5b4 | 2012-06-20 15:59:18 +0800 | [diff] [blame] | 589 | /* |
| 590 | * For the spte updated out of mmu-lock is safe, since |
| 591 | * we always atomicly update it, see the comments in |
| 592 | * spte_has_volatile_bits(). |
| 593 | */ |
Xiao Guangrong | 7f31c95 | 2014-04-17 17:06:15 +0800 | [diff] [blame] | 594 | if (spte_is_locklessly_modifiable(old_spte) && |
| 595 | !is_writable_pte(new_spte)) |
Xiao Guangrong | 6e7d035 | 2012-06-20 15:58:33 +0800 | [diff] [blame] | 596 | ret = true; |
| 597 | |
Xiao Guangrong | 4132779 | 2010-08-02 16:15:08 +0800 | [diff] [blame] | 598 | if (!shadow_accessed_mask) |
Xiao Guangrong | 6e7d035 | 2012-06-20 15:58:33 +0800 | [diff] [blame] | 599 | return ret; |
Xiao Guangrong | 4132779 | 2010-08-02 16:15:08 +0800 | [diff] [blame] | 600 | |
| 601 | if (spte_is_bit_cleared(old_spte, new_spte, shadow_accessed_mask)) |
| 602 | kvm_set_pfn_accessed(spte_to_pfn(old_spte)); |
| 603 | if (spte_is_bit_cleared(old_spte, new_spte, shadow_dirty_mask)) |
| 604 | kvm_set_pfn_dirty(spte_to_pfn(old_spte)); |
Xiao Guangrong | 6e7d035 | 2012-06-20 15:58:33 +0800 | [diff] [blame] | 605 | |
| 606 | return ret; |
Avi Kivity | b79b93f | 2010-06-06 15:46:44 +0300 | [diff] [blame] | 607 | } |
| 608 | |
Xiao Guangrong | 1df9f2d | 2011-07-12 03:30:35 +0800 | [diff] [blame] | 609 | /* |
| 610 | * Rules for using mmu_spte_clear_track_bits: |
| 611 | * It sets the sptep from present to nonpresent, and track the |
| 612 | * state bits, it is used to clear the last level sptep. |
| 613 | */ |
| 614 | static int mmu_spte_clear_track_bits(u64 *sptep) |
| 615 | { |
| 616 | pfn_t pfn; |
| 617 | u64 old_spte = *sptep; |
| 618 | |
| 619 | if (!spte_has_volatile_bits(old_spte)) |
Xiao Guangrong | 603e065 | 2011-07-12 03:31:28 +0800 | [diff] [blame] | 620 | __update_clear_spte_fast(sptep, 0ull); |
Xiao Guangrong | 1df9f2d | 2011-07-12 03:30:35 +0800 | [diff] [blame] | 621 | else |
Xiao Guangrong | 603e065 | 2011-07-12 03:31:28 +0800 | [diff] [blame] | 622 | old_spte = __update_clear_spte_slow(sptep, 0ull); |
Xiao Guangrong | 1df9f2d | 2011-07-12 03:30:35 +0800 | [diff] [blame] | 623 | |
| 624 | if (!is_rmap_spte(old_spte)) |
| 625 | return 0; |
| 626 | |
| 627 | pfn = spte_to_pfn(old_spte); |
Xiao Guangrong | 86fde74 | 2012-07-17 21:52:52 +0800 | [diff] [blame] | 628 | |
| 629 | /* |
| 630 | * KVM does not hold the refcount of the page used by |
| 631 | * kvm mmu, before reclaiming the page, we should |
| 632 | * unmap it from mmu first. |
| 633 | */ |
| 634 | WARN_ON(!kvm_is_mmio_pfn(pfn) && !page_count(pfn_to_page(pfn))); |
| 635 | |
Xiao Guangrong | 1df9f2d | 2011-07-12 03:30:35 +0800 | [diff] [blame] | 636 | if (!shadow_accessed_mask || old_spte & shadow_accessed_mask) |
| 637 | kvm_set_pfn_accessed(pfn); |
| 638 | if (!shadow_dirty_mask || (old_spte & shadow_dirty_mask)) |
| 639 | kvm_set_pfn_dirty(pfn); |
| 640 | return 1; |
| 641 | } |
| 642 | |
| 643 | /* |
| 644 | * Rules for using mmu_spte_clear_no_track: |
| 645 | * Directly clear spte without caring the state bits of sptep, |
| 646 | * it is used to set the upper level spte. |
| 647 | */ |
| 648 | static void mmu_spte_clear_no_track(u64 *sptep) |
| 649 | { |
Xiao Guangrong | 603e065 | 2011-07-12 03:31:28 +0800 | [diff] [blame] | 650 | __update_clear_spte_fast(sptep, 0ull); |
Xiao Guangrong | 1df9f2d | 2011-07-12 03:30:35 +0800 | [diff] [blame] | 651 | } |
| 652 | |
Xiao Guangrong | c2a2ac2 | 2011-07-12 03:32:13 +0800 | [diff] [blame] | 653 | static u64 mmu_spte_get_lockless(u64 *sptep) |
| 654 | { |
| 655 | return __get_spte_lockless(sptep); |
| 656 | } |
| 657 | |
| 658 | static void walk_shadow_page_lockless_begin(struct kvm_vcpu *vcpu) |
| 659 | { |
Avi Kivity | c142786 | 2012-05-14 15:44:06 +0300 | [diff] [blame] | 660 | /* |
| 661 | * Prevent page table teardown by making any free-er wait during |
| 662 | * kvm_flush_remote_tlbs() IPI to all active vcpus. |
| 663 | */ |
| 664 | local_irq_disable(); |
| 665 | vcpu->mode = READING_SHADOW_PAGE_TABLES; |
| 666 | /* |
| 667 | * Make sure a following spte read is not reordered ahead of the write |
| 668 | * to vcpu->mode. |
| 669 | */ |
| 670 | smp_mb(); |
Xiao Guangrong | c2a2ac2 | 2011-07-12 03:32:13 +0800 | [diff] [blame] | 671 | } |
| 672 | |
| 673 | static void walk_shadow_page_lockless_end(struct kvm_vcpu *vcpu) |
| 674 | { |
Avi Kivity | c142786 | 2012-05-14 15:44:06 +0300 | [diff] [blame] | 675 | /* |
| 676 | * Make sure the write to vcpu->mode is not reordered in front of |
| 677 | * reads to sptes. If it does, kvm_commit_zap_page() can see us |
| 678 | * OUTSIDE_GUEST_MODE and proceed to free the shadow page table. |
| 679 | */ |
| 680 | smp_mb(); |
| 681 | vcpu->mode = OUTSIDE_GUEST_MODE; |
| 682 | local_irq_enable(); |
Xiao Guangrong | c2a2ac2 | 2011-07-12 03:32:13 +0800 | [diff] [blame] | 683 | } |
| 684 | |
Avi Kivity | e2dec93 | 2007-01-05 16:36:54 -0800 | [diff] [blame] | 685 | static int mmu_topup_memory_cache(struct kvm_mmu_memory_cache *cache, |
Avi Kivity | 2e3e588 | 2007-09-10 11:28:17 +0300 | [diff] [blame] | 686 | struct kmem_cache *base_cache, int min) |
Avi Kivity | 714b93d | 2007-01-05 16:36:53 -0800 | [diff] [blame] | 687 | { |
| 688 | void *obj; |
| 689 | |
| 690 | if (cache->nobjs >= min) |
Avi Kivity | e2dec93 | 2007-01-05 16:36:54 -0800 | [diff] [blame] | 691 | return 0; |
Avi Kivity | 714b93d | 2007-01-05 16:36:53 -0800 | [diff] [blame] | 692 | while (cache->nobjs < ARRAY_SIZE(cache->objects)) { |
Avi Kivity | 2e3e588 | 2007-09-10 11:28:17 +0300 | [diff] [blame] | 693 | obj = kmem_cache_zalloc(base_cache, GFP_KERNEL); |
Avi Kivity | 714b93d | 2007-01-05 16:36:53 -0800 | [diff] [blame] | 694 | if (!obj) |
Avi Kivity | e2dec93 | 2007-01-05 16:36:54 -0800 | [diff] [blame] | 695 | return -ENOMEM; |
Avi Kivity | 714b93d | 2007-01-05 16:36:53 -0800 | [diff] [blame] | 696 | cache->objects[cache->nobjs++] = obj; |
| 697 | } |
Avi Kivity | e2dec93 | 2007-01-05 16:36:54 -0800 | [diff] [blame] | 698 | return 0; |
Avi Kivity | 714b93d | 2007-01-05 16:36:53 -0800 | [diff] [blame] | 699 | } |
| 700 | |
Xiao Guangrong | f759e2b | 2011-09-22 16:53:17 +0800 | [diff] [blame] | 701 | static int mmu_memory_cache_free_objects(struct kvm_mmu_memory_cache *cache) |
| 702 | { |
| 703 | return cache->nobjs; |
| 704 | } |
| 705 | |
Xiao Guangrong | e8ad9a7 | 2010-05-13 10:06:02 +0800 | [diff] [blame] | 706 | static void mmu_free_memory_cache(struct kvm_mmu_memory_cache *mc, |
| 707 | struct kmem_cache *cache) |
Avi Kivity | 714b93d | 2007-01-05 16:36:53 -0800 | [diff] [blame] | 708 | { |
| 709 | while (mc->nobjs) |
Xiao Guangrong | e8ad9a7 | 2010-05-13 10:06:02 +0800 | [diff] [blame] | 710 | kmem_cache_free(cache, mc->objects[--mc->nobjs]); |
Avi Kivity | 714b93d | 2007-01-05 16:36:53 -0800 | [diff] [blame] | 711 | } |
| 712 | |
Avi Kivity | c1158e6 | 2007-07-20 08:18:27 +0300 | [diff] [blame] | 713 | static int mmu_topup_memory_cache_page(struct kvm_mmu_memory_cache *cache, |
Avi Kivity | 2e3e588 | 2007-09-10 11:28:17 +0300 | [diff] [blame] | 714 | int min) |
Avi Kivity | c1158e6 | 2007-07-20 08:18:27 +0300 | [diff] [blame] | 715 | { |
Xiao Guangrong | 842f22e | 2011-03-04 19:01:10 +0800 | [diff] [blame] | 716 | void *page; |
Avi Kivity | c1158e6 | 2007-07-20 08:18:27 +0300 | [diff] [blame] | 717 | |
| 718 | if (cache->nobjs >= min) |
| 719 | return 0; |
| 720 | while (cache->nobjs < ARRAY_SIZE(cache->objects)) { |
Xiao Guangrong | 842f22e | 2011-03-04 19:01:10 +0800 | [diff] [blame] | 721 | page = (void *)__get_free_page(GFP_KERNEL); |
Avi Kivity | c1158e6 | 2007-07-20 08:18:27 +0300 | [diff] [blame] | 722 | if (!page) |
| 723 | return -ENOMEM; |
Xiao Guangrong | 842f22e | 2011-03-04 19:01:10 +0800 | [diff] [blame] | 724 | cache->objects[cache->nobjs++] = page; |
Avi Kivity | c1158e6 | 2007-07-20 08:18:27 +0300 | [diff] [blame] | 725 | } |
| 726 | return 0; |
| 727 | } |
| 728 | |
| 729 | static void mmu_free_memory_cache_page(struct kvm_mmu_memory_cache *mc) |
| 730 | { |
| 731 | while (mc->nobjs) |
Avi Kivity | c4d198d | 2007-07-21 09:06:46 +0300 | [diff] [blame] | 732 | free_page((unsigned long)mc->objects[--mc->nobjs]); |
Avi Kivity | c1158e6 | 2007-07-20 08:18:27 +0300 | [diff] [blame] | 733 | } |
| 734 | |
Avi Kivity | 8c43850 | 2007-04-16 11:53:17 +0300 | [diff] [blame] | 735 | static int mmu_topup_memory_caches(struct kvm_vcpu *vcpu) |
| 736 | { |
| 737 | int r; |
| 738 | |
Xiao Guangrong | 53c07b1 | 2011-05-15 23:26:20 +0800 | [diff] [blame] | 739 | r = mmu_topup_memory_cache(&vcpu->arch.mmu_pte_list_desc_cache, |
Xiao Guangrong | 67052b3 | 2011-05-15 23:27:08 +0800 | [diff] [blame] | 740 | pte_list_desc_cache, 8 + PTE_PREFETCH_NUM); |
Avi Kivity | 2e3e588 | 2007-09-10 11:28:17 +0300 | [diff] [blame] | 741 | if (r) |
| 742 | goto out; |
Zhang Xiantao | ad312c7 | 2007-12-13 23:50:52 +0800 | [diff] [blame] | 743 | r = mmu_topup_memory_cache_page(&vcpu->arch.mmu_page_cache, 8); |
Avi Kivity | 2e3e588 | 2007-09-10 11:28:17 +0300 | [diff] [blame] | 744 | if (r) |
| 745 | goto out; |
Zhang Xiantao | ad312c7 | 2007-12-13 23:50:52 +0800 | [diff] [blame] | 746 | r = mmu_topup_memory_cache(&vcpu->arch.mmu_page_header_cache, |
Avi Kivity | 2e3e588 | 2007-09-10 11:28:17 +0300 | [diff] [blame] | 747 | mmu_page_header_cache, 4); |
| 748 | out: |
Avi Kivity | 8c43850 | 2007-04-16 11:53:17 +0300 | [diff] [blame] | 749 | return r; |
| 750 | } |
| 751 | |
Avi Kivity | 714b93d | 2007-01-05 16:36:53 -0800 | [diff] [blame] | 752 | static void mmu_free_memory_caches(struct kvm_vcpu *vcpu) |
| 753 | { |
Xiao Guangrong | 53c07b1 | 2011-05-15 23:26:20 +0800 | [diff] [blame] | 754 | mmu_free_memory_cache(&vcpu->arch.mmu_pte_list_desc_cache, |
| 755 | pte_list_desc_cache); |
Zhang Xiantao | ad312c7 | 2007-12-13 23:50:52 +0800 | [diff] [blame] | 756 | mmu_free_memory_cache_page(&vcpu->arch.mmu_page_cache); |
Xiao Guangrong | e8ad9a7 | 2010-05-13 10:06:02 +0800 | [diff] [blame] | 757 | mmu_free_memory_cache(&vcpu->arch.mmu_page_header_cache, |
| 758 | mmu_page_header_cache); |
Avi Kivity | 714b93d | 2007-01-05 16:36:53 -0800 | [diff] [blame] | 759 | } |
| 760 | |
Takuya Yoshikawa | 80feb89 | 2012-05-29 23:54:26 +0900 | [diff] [blame] | 761 | static void *mmu_memory_cache_alloc(struct kvm_mmu_memory_cache *mc) |
Avi Kivity | 714b93d | 2007-01-05 16:36:53 -0800 | [diff] [blame] | 762 | { |
| 763 | void *p; |
| 764 | |
| 765 | BUG_ON(!mc->nobjs); |
| 766 | p = mc->objects[--mc->nobjs]; |
Avi Kivity | 714b93d | 2007-01-05 16:36:53 -0800 | [diff] [blame] | 767 | return p; |
| 768 | } |
| 769 | |
Xiao Guangrong | 53c07b1 | 2011-05-15 23:26:20 +0800 | [diff] [blame] | 770 | static struct pte_list_desc *mmu_alloc_pte_list_desc(struct kvm_vcpu *vcpu) |
Avi Kivity | 714b93d | 2007-01-05 16:36:53 -0800 | [diff] [blame] | 771 | { |
Takuya Yoshikawa | 80feb89 | 2012-05-29 23:54:26 +0900 | [diff] [blame] | 772 | return mmu_memory_cache_alloc(&vcpu->arch.mmu_pte_list_desc_cache); |
Avi Kivity | 714b93d | 2007-01-05 16:36:53 -0800 | [diff] [blame] | 773 | } |
| 774 | |
Xiao Guangrong | 53c07b1 | 2011-05-15 23:26:20 +0800 | [diff] [blame] | 775 | static void mmu_free_pte_list_desc(struct pte_list_desc *pte_list_desc) |
Avi Kivity | 714b93d | 2007-01-05 16:36:53 -0800 | [diff] [blame] | 776 | { |
Xiao Guangrong | 53c07b1 | 2011-05-15 23:26:20 +0800 | [diff] [blame] | 777 | kmem_cache_free(pte_list_desc_cache, pte_list_desc); |
Avi Kivity | 714b93d | 2007-01-05 16:36:53 -0800 | [diff] [blame] | 778 | } |
| 779 | |
Lai Jiangshan | 2032a93 | 2010-05-26 16:49:59 +0800 | [diff] [blame] | 780 | static gfn_t kvm_mmu_page_get_gfn(struct kvm_mmu_page *sp, int index) |
| 781 | { |
| 782 | if (!sp->role.direct) |
| 783 | return sp->gfns[index]; |
| 784 | |
| 785 | return sp->gfn + (index << ((sp->role.level - 1) * PT64_LEVEL_BITS)); |
| 786 | } |
| 787 | |
| 788 | static void kvm_mmu_page_set_gfn(struct kvm_mmu_page *sp, int index, gfn_t gfn) |
| 789 | { |
| 790 | if (sp->role.direct) |
| 791 | BUG_ON(gfn != kvm_mmu_page_get_gfn(sp, index)); |
| 792 | else |
| 793 | sp->gfns[index] = gfn; |
| 794 | } |
| 795 | |
Avi Kivity | cd4a4e5 | 2007-01-05 16:36:38 -0800 | [diff] [blame] | 796 | /* |
Takuya Yoshikawa | d4dbf47 | 2010-12-07 12:59:07 +0900 | [diff] [blame] | 797 | * Return the pointer to the large page information for a given gfn, |
| 798 | * handling slots that are not large page aligned. |
Marcelo Tosatti | 05da455 | 2008-02-23 11:44:30 -0300 | [diff] [blame] | 799 | */ |
Takuya Yoshikawa | d4dbf47 | 2010-12-07 12:59:07 +0900 | [diff] [blame] | 800 | static struct kvm_lpage_info *lpage_info_slot(gfn_t gfn, |
| 801 | struct kvm_memory_slot *slot, |
| 802 | int level) |
Marcelo Tosatti | 05da455 | 2008-02-23 11:44:30 -0300 | [diff] [blame] | 803 | { |
| 804 | unsigned long idx; |
| 805 | |
Takuya Yoshikawa | fb03cb6 | 2012-02-08 12:59:10 +0900 | [diff] [blame] | 806 | idx = gfn_to_index(gfn, slot->base_gfn, level); |
Takuya Yoshikawa | db3fe4e | 2012-02-08 13:02:18 +0900 | [diff] [blame] | 807 | return &slot->arch.lpage_info[level - 2][idx]; |
Marcelo Tosatti | 05da455 | 2008-02-23 11:44:30 -0300 | [diff] [blame] | 808 | } |
| 809 | |
| 810 | static void account_shadowed(struct kvm *kvm, gfn_t gfn) |
| 811 | { |
Joerg Roedel | d25797b | 2009-07-27 16:30:43 +0200 | [diff] [blame] | 812 | struct kvm_memory_slot *slot; |
Takuya Yoshikawa | d4dbf47 | 2010-12-07 12:59:07 +0900 | [diff] [blame] | 813 | struct kvm_lpage_info *linfo; |
Joerg Roedel | d25797b | 2009-07-27 16:30:43 +0200 | [diff] [blame] | 814 | int i; |
Marcelo Tosatti | 05da455 | 2008-02-23 11:44:30 -0300 | [diff] [blame] | 815 | |
Avi Kivity | a1f4d395 | 2010-06-21 11:44:20 +0300 | [diff] [blame] | 816 | slot = gfn_to_memslot(kvm, gfn); |
Joerg Roedel | d25797b | 2009-07-27 16:30:43 +0200 | [diff] [blame] | 817 | for (i = PT_DIRECTORY_LEVEL; |
| 818 | i < PT_PAGE_TABLE_LEVEL + KVM_NR_PAGE_SIZES; ++i) { |
Takuya Yoshikawa | d4dbf47 | 2010-12-07 12:59:07 +0900 | [diff] [blame] | 819 | linfo = lpage_info_slot(gfn, slot, i); |
| 820 | linfo->write_count += 1; |
Joerg Roedel | d25797b | 2009-07-27 16:30:43 +0200 | [diff] [blame] | 821 | } |
Xiao Guangrong | 332b207 | 2011-05-15 23:20:27 +0800 | [diff] [blame] | 822 | kvm->arch.indirect_shadow_pages++; |
Marcelo Tosatti | 05da455 | 2008-02-23 11:44:30 -0300 | [diff] [blame] | 823 | } |
| 824 | |
| 825 | static void unaccount_shadowed(struct kvm *kvm, gfn_t gfn) |
| 826 | { |
Joerg Roedel | d25797b | 2009-07-27 16:30:43 +0200 | [diff] [blame] | 827 | struct kvm_memory_slot *slot; |
Takuya Yoshikawa | d4dbf47 | 2010-12-07 12:59:07 +0900 | [diff] [blame] | 828 | struct kvm_lpage_info *linfo; |
Joerg Roedel | d25797b | 2009-07-27 16:30:43 +0200 | [diff] [blame] | 829 | int i; |
Marcelo Tosatti | 05da455 | 2008-02-23 11:44:30 -0300 | [diff] [blame] | 830 | |
Avi Kivity | a1f4d395 | 2010-06-21 11:44:20 +0300 | [diff] [blame] | 831 | slot = gfn_to_memslot(kvm, gfn); |
Joerg Roedel | d25797b | 2009-07-27 16:30:43 +0200 | [diff] [blame] | 832 | for (i = PT_DIRECTORY_LEVEL; |
| 833 | i < PT_PAGE_TABLE_LEVEL + KVM_NR_PAGE_SIZES; ++i) { |
Takuya Yoshikawa | d4dbf47 | 2010-12-07 12:59:07 +0900 | [diff] [blame] | 834 | linfo = lpage_info_slot(gfn, slot, i); |
| 835 | linfo->write_count -= 1; |
| 836 | WARN_ON(linfo->write_count < 0); |
Joerg Roedel | d25797b | 2009-07-27 16:30:43 +0200 | [diff] [blame] | 837 | } |
Xiao Guangrong | 332b207 | 2011-05-15 23:20:27 +0800 | [diff] [blame] | 838 | kvm->arch.indirect_shadow_pages--; |
Marcelo Tosatti | 05da455 | 2008-02-23 11:44:30 -0300 | [diff] [blame] | 839 | } |
| 840 | |
Joerg Roedel | d25797b | 2009-07-27 16:30:43 +0200 | [diff] [blame] | 841 | static int has_wrprotected_page(struct kvm *kvm, |
| 842 | gfn_t gfn, |
| 843 | int level) |
Marcelo Tosatti | 05da455 | 2008-02-23 11:44:30 -0300 | [diff] [blame] | 844 | { |
Izik Eidus | 2843099 | 2008-10-03 17:40:32 +0300 | [diff] [blame] | 845 | struct kvm_memory_slot *slot; |
Takuya Yoshikawa | d4dbf47 | 2010-12-07 12:59:07 +0900 | [diff] [blame] | 846 | struct kvm_lpage_info *linfo; |
Marcelo Tosatti | 05da455 | 2008-02-23 11:44:30 -0300 | [diff] [blame] | 847 | |
Avi Kivity | a1f4d395 | 2010-06-21 11:44:20 +0300 | [diff] [blame] | 848 | slot = gfn_to_memslot(kvm, gfn); |
Marcelo Tosatti | 05da455 | 2008-02-23 11:44:30 -0300 | [diff] [blame] | 849 | if (slot) { |
Takuya Yoshikawa | d4dbf47 | 2010-12-07 12:59:07 +0900 | [diff] [blame] | 850 | linfo = lpage_info_slot(gfn, slot, level); |
| 851 | return linfo->write_count; |
Marcelo Tosatti | 05da455 | 2008-02-23 11:44:30 -0300 | [diff] [blame] | 852 | } |
| 853 | |
| 854 | return 1; |
| 855 | } |
| 856 | |
Joerg Roedel | d25797b | 2009-07-27 16:30:43 +0200 | [diff] [blame] | 857 | static int host_mapping_level(struct kvm *kvm, gfn_t gfn) |
Marcelo Tosatti | 05da455 | 2008-02-23 11:44:30 -0300 | [diff] [blame] | 858 | { |
Joerg Roedel | 8f0b1ab | 2010-01-28 12:37:56 +0100 | [diff] [blame] | 859 | unsigned long page_size; |
Joerg Roedel | d25797b | 2009-07-27 16:30:43 +0200 | [diff] [blame] | 860 | int i, ret = 0; |
Marcelo Tosatti | 05da455 | 2008-02-23 11:44:30 -0300 | [diff] [blame] | 861 | |
Joerg Roedel | 8f0b1ab | 2010-01-28 12:37:56 +0100 | [diff] [blame] | 862 | page_size = kvm_host_page_size(kvm, gfn); |
Marcelo Tosatti | 05da455 | 2008-02-23 11:44:30 -0300 | [diff] [blame] | 863 | |
Joerg Roedel | d25797b | 2009-07-27 16:30:43 +0200 | [diff] [blame] | 864 | for (i = PT_PAGE_TABLE_LEVEL; |
| 865 | i < (PT_PAGE_TABLE_LEVEL + KVM_NR_PAGE_SIZES); ++i) { |
| 866 | if (page_size >= KVM_HPAGE_SIZE(i)) |
| 867 | ret = i; |
| 868 | else |
| 869 | break; |
| 870 | } |
| 871 | |
Marcelo Tosatti | 4c2155c | 2008-09-16 20:54:47 -0300 | [diff] [blame] | 872 | return ret; |
Marcelo Tosatti | 05da455 | 2008-02-23 11:44:30 -0300 | [diff] [blame] | 873 | } |
| 874 | |
Xiao Guangrong | 5d163b1 | 2011-03-09 15:43:00 +0800 | [diff] [blame] | 875 | static struct kvm_memory_slot * |
| 876 | gfn_to_memslot_dirty_bitmap(struct kvm_vcpu *vcpu, gfn_t gfn, |
| 877 | bool no_dirty_log) |
Marcelo Tosatti | 05da455 | 2008-02-23 11:44:30 -0300 | [diff] [blame] | 878 | { |
| 879 | struct kvm_memory_slot *slot; |
Xiao Guangrong | 5d163b1 | 2011-03-09 15:43:00 +0800 | [diff] [blame] | 880 | |
| 881 | slot = gfn_to_memslot(vcpu->kvm, gfn); |
| 882 | if (!slot || slot->flags & KVM_MEMSLOT_INVALID || |
| 883 | (no_dirty_log && slot->dirty_bitmap)) |
| 884 | slot = NULL; |
| 885 | |
| 886 | return slot; |
| 887 | } |
| 888 | |
| 889 | static bool mapping_level_dirty_bitmap(struct kvm_vcpu *vcpu, gfn_t large_gfn) |
| 890 | { |
Steve | a0a8eab | 2011-06-17 10:25:39 +0800 | [diff] [blame] | 891 | return !gfn_to_memslot_dirty_bitmap(vcpu, large_gfn, true); |
Andrea Arcangeli | 936a5fe | 2011-01-13 15:46:48 -0800 | [diff] [blame] | 892 | } |
| 893 | |
| 894 | static int mapping_level(struct kvm_vcpu *vcpu, gfn_t large_gfn) |
| 895 | { |
| 896 | int host_level, level, max_level; |
Marcelo Tosatti | 05da455 | 2008-02-23 11:44:30 -0300 | [diff] [blame] | 897 | |
Joerg Roedel | d25797b | 2009-07-27 16:30:43 +0200 | [diff] [blame] | 898 | host_level = host_mapping_level(vcpu->kvm, large_gfn); |
| 899 | |
| 900 | if (host_level == PT_PAGE_TABLE_LEVEL) |
| 901 | return host_level; |
| 902 | |
Xiao Guangrong | 55dd98c | 2013-02-05 15:26:54 +0800 | [diff] [blame] | 903 | max_level = min(kvm_x86_ops->get_lpage_level(), host_level); |
Sheng Yang | 878403b | 2010-01-05 19:02:29 +0800 | [diff] [blame] | 904 | |
| 905 | for (level = PT_DIRECTORY_LEVEL; level <= max_level; ++level) |
Joerg Roedel | d25797b | 2009-07-27 16:30:43 +0200 | [diff] [blame] | 906 | if (has_wrprotected_page(vcpu->kvm, large_gfn, level)) |
| 907 | break; |
Joerg Roedel | d25797b | 2009-07-27 16:30:43 +0200 | [diff] [blame] | 908 | |
| 909 | return level - 1; |
Marcelo Tosatti | 05da455 | 2008-02-23 11:44:30 -0300 | [diff] [blame] | 910 | } |
| 911 | |
| 912 | /* |
Xiao Guangrong | 53c07b1 | 2011-05-15 23:26:20 +0800 | [diff] [blame] | 913 | * Pte mapping structures: |
| 914 | * |
| 915 | * If pte_list bit zero is zero, then pte_list point to the spte. |
| 916 | * |
| 917 | * If pte_list bit zero is one, (then pte_list & ~1) points to a struct |
| 918 | * pte_list_desc containing more mappings. |
| 919 | * |
| 920 | * Returns the number of pte entries before the spte was added or zero if |
| 921 | * the spte was not added. |
| 922 | * |
| 923 | */ |
| 924 | static int pte_list_add(struct kvm_vcpu *vcpu, u64 *spte, |
| 925 | unsigned long *pte_list) |
| 926 | { |
| 927 | struct pte_list_desc *desc; |
| 928 | int i, count = 0; |
| 929 | |
| 930 | if (!*pte_list) { |
| 931 | rmap_printk("pte_list_add: %p %llx 0->1\n", spte, *spte); |
| 932 | *pte_list = (unsigned long)spte; |
| 933 | } else if (!(*pte_list & 1)) { |
| 934 | rmap_printk("pte_list_add: %p %llx 1->many\n", spte, *spte); |
| 935 | desc = mmu_alloc_pte_list_desc(vcpu); |
| 936 | desc->sptes[0] = (u64 *)*pte_list; |
| 937 | desc->sptes[1] = spte; |
| 938 | *pte_list = (unsigned long)desc | 1; |
| 939 | ++count; |
| 940 | } else { |
| 941 | rmap_printk("pte_list_add: %p %llx many->many\n", spte, *spte); |
| 942 | desc = (struct pte_list_desc *)(*pte_list & ~1ul); |
| 943 | while (desc->sptes[PTE_LIST_EXT-1] && desc->more) { |
| 944 | desc = desc->more; |
| 945 | count += PTE_LIST_EXT; |
| 946 | } |
| 947 | if (desc->sptes[PTE_LIST_EXT-1]) { |
| 948 | desc->more = mmu_alloc_pte_list_desc(vcpu); |
| 949 | desc = desc->more; |
| 950 | } |
| 951 | for (i = 0; desc->sptes[i]; ++i) |
| 952 | ++count; |
| 953 | desc->sptes[i] = spte; |
| 954 | } |
| 955 | return count; |
| 956 | } |
| 957 | |
Xiao Guangrong | 53c07b1 | 2011-05-15 23:26:20 +0800 | [diff] [blame] | 958 | static void |
| 959 | pte_list_desc_remove_entry(unsigned long *pte_list, struct pte_list_desc *desc, |
| 960 | int i, struct pte_list_desc *prev_desc) |
| 961 | { |
| 962 | int j; |
| 963 | |
| 964 | for (j = PTE_LIST_EXT - 1; !desc->sptes[j] && j > i; --j) |
| 965 | ; |
| 966 | desc->sptes[i] = desc->sptes[j]; |
| 967 | desc->sptes[j] = NULL; |
| 968 | if (j != 0) |
| 969 | return; |
| 970 | if (!prev_desc && !desc->more) |
| 971 | *pte_list = (unsigned long)desc->sptes[0]; |
| 972 | else |
| 973 | if (prev_desc) |
| 974 | prev_desc->more = desc->more; |
| 975 | else |
| 976 | *pte_list = (unsigned long)desc->more | 1; |
| 977 | mmu_free_pte_list_desc(desc); |
| 978 | } |
| 979 | |
| 980 | static void pte_list_remove(u64 *spte, unsigned long *pte_list) |
| 981 | { |
| 982 | struct pte_list_desc *desc; |
| 983 | struct pte_list_desc *prev_desc; |
| 984 | int i; |
| 985 | |
| 986 | if (!*pte_list) { |
| 987 | printk(KERN_ERR "pte_list_remove: %p 0->BUG\n", spte); |
| 988 | BUG(); |
| 989 | } else if (!(*pte_list & 1)) { |
| 990 | rmap_printk("pte_list_remove: %p 1->0\n", spte); |
| 991 | if ((u64 *)*pte_list != spte) { |
| 992 | printk(KERN_ERR "pte_list_remove: %p 1->BUG\n", spte); |
| 993 | BUG(); |
| 994 | } |
| 995 | *pte_list = 0; |
| 996 | } else { |
| 997 | rmap_printk("pte_list_remove: %p many->many\n", spte); |
| 998 | desc = (struct pte_list_desc *)(*pte_list & ~1ul); |
| 999 | prev_desc = NULL; |
| 1000 | while (desc) { |
| 1001 | for (i = 0; i < PTE_LIST_EXT && desc->sptes[i]; ++i) |
| 1002 | if (desc->sptes[i] == spte) { |
| 1003 | pte_list_desc_remove_entry(pte_list, |
| 1004 | desc, i, |
| 1005 | prev_desc); |
| 1006 | return; |
| 1007 | } |
| 1008 | prev_desc = desc; |
| 1009 | desc = desc->more; |
| 1010 | } |
| 1011 | pr_err("pte_list_remove: %p many->many\n", spte); |
| 1012 | BUG(); |
| 1013 | } |
| 1014 | } |
| 1015 | |
Xiao Guangrong | 67052b3 | 2011-05-15 23:27:08 +0800 | [diff] [blame] | 1016 | typedef void (*pte_list_walk_fn) (u64 *spte); |
| 1017 | static void pte_list_walk(unsigned long *pte_list, pte_list_walk_fn fn) |
| 1018 | { |
| 1019 | struct pte_list_desc *desc; |
| 1020 | int i; |
| 1021 | |
| 1022 | if (!*pte_list) |
| 1023 | return; |
| 1024 | |
| 1025 | if (!(*pte_list & 1)) |
| 1026 | return fn((u64 *)*pte_list); |
| 1027 | |
| 1028 | desc = (struct pte_list_desc *)(*pte_list & ~1ul); |
| 1029 | while (desc) { |
| 1030 | for (i = 0; i < PTE_LIST_EXT && desc->sptes[i]; ++i) |
| 1031 | fn(desc->sptes[i]); |
| 1032 | desc = desc->more; |
| 1033 | } |
| 1034 | } |
| 1035 | |
Takuya Yoshikawa | 9373e2c0 | 2012-01-17 19:51:20 +0900 | [diff] [blame] | 1036 | static unsigned long *__gfn_to_rmap(gfn_t gfn, int level, |
Takuya Yoshikawa | 9b9b149 | 2011-11-14 18:22:28 +0900 | [diff] [blame] | 1037 | struct kvm_memory_slot *slot) |
| 1038 | { |
Takuya Yoshikawa | 77d1130 | 2012-07-02 17:57:17 +0900 | [diff] [blame] | 1039 | unsigned long idx; |
Takuya Yoshikawa | 9b9b149 | 2011-11-14 18:22:28 +0900 | [diff] [blame] | 1040 | |
Takuya Yoshikawa | 77d1130 | 2012-07-02 17:57:17 +0900 | [diff] [blame] | 1041 | idx = gfn_to_index(gfn, slot->base_gfn, level); |
Takuya Yoshikawa | d89cc61 | 2012-08-01 18:03:28 +0900 | [diff] [blame] | 1042 | return &slot->arch.rmap[level - PT_PAGE_TABLE_LEVEL][idx]; |
Takuya Yoshikawa | 9b9b149 | 2011-11-14 18:22:28 +0900 | [diff] [blame] | 1043 | } |
| 1044 | |
Xiao Guangrong | 53c07b1 | 2011-05-15 23:26:20 +0800 | [diff] [blame] | 1045 | /* |
Izik Eidus | 290fc38 | 2007-09-27 14:11:22 +0200 | [diff] [blame] | 1046 | * Take gfn and return the reverse mapping to it. |
Izik Eidus | 290fc38 | 2007-09-27 14:11:22 +0200 | [diff] [blame] | 1047 | */ |
Joerg Roedel | 44ad994 | 2009-07-27 16:30:42 +0200 | [diff] [blame] | 1048 | static unsigned long *gfn_to_rmap(struct kvm *kvm, gfn_t gfn, int level) |
Izik Eidus | 290fc38 | 2007-09-27 14:11:22 +0200 | [diff] [blame] | 1049 | { |
| 1050 | struct kvm_memory_slot *slot; |
| 1051 | |
| 1052 | slot = gfn_to_memslot(kvm, gfn); |
Takuya Yoshikawa | 9373e2c0 | 2012-01-17 19:51:20 +0900 | [diff] [blame] | 1053 | return __gfn_to_rmap(gfn, level, slot); |
Izik Eidus | 290fc38 | 2007-09-27 14:11:22 +0200 | [diff] [blame] | 1054 | } |
| 1055 | |
Xiao Guangrong | f759e2b | 2011-09-22 16:53:17 +0800 | [diff] [blame] | 1056 | static bool rmap_can_add(struct kvm_vcpu *vcpu) |
| 1057 | { |
| 1058 | struct kvm_mmu_memory_cache *cache; |
| 1059 | |
| 1060 | cache = &vcpu->arch.mmu_pte_list_desc_cache; |
| 1061 | return mmu_memory_cache_free_objects(cache); |
| 1062 | } |
| 1063 | |
Joerg Roedel | 44ad994 | 2009-07-27 16:30:42 +0200 | [diff] [blame] | 1064 | static int rmap_add(struct kvm_vcpu *vcpu, u64 *spte, gfn_t gfn) |
Avi Kivity | cd4a4e5 | 2007-01-05 16:36:38 -0800 | [diff] [blame] | 1065 | { |
Avi Kivity | 4db3531 | 2007-11-21 15:28:32 +0200 | [diff] [blame] | 1066 | struct kvm_mmu_page *sp; |
Izik Eidus | 290fc38 | 2007-09-27 14:11:22 +0200 | [diff] [blame] | 1067 | unsigned long *rmapp; |
Avi Kivity | cd4a4e5 | 2007-01-05 16:36:38 -0800 | [diff] [blame] | 1068 | |
Avi Kivity | 4db3531 | 2007-11-21 15:28:32 +0200 | [diff] [blame] | 1069 | sp = page_header(__pa(spte)); |
Lai Jiangshan | 2032a93 | 2010-05-26 16:49:59 +0800 | [diff] [blame] | 1070 | kvm_mmu_page_set_gfn(sp, spte - sp->spt, gfn); |
Joerg Roedel | 44ad994 | 2009-07-27 16:30:42 +0200 | [diff] [blame] | 1071 | rmapp = gfn_to_rmap(vcpu->kvm, gfn, sp->role.level); |
Xiao Guangrong | 53c07b1 | 2011-05-15 23:26:20 +0800 | [diff] [blame] | 1072 | return pte_list_add(vcpu, spte, rmapp); |
Avi Kivity | cd4a4e5 | 2007-01-05 16:36:38 -0800 | [diff] [blame] | 1073 | } |
| 1074 | |
Izik Eidus | 290fc38 | 2007-09-27 14:11:22 +0200 | [diff] [blame] | 1075 | static void rmap_remove(struct kvm *kvm, u64 *spte) |
Avi Kivity | cd4a4e5 | 2007-01-05 16:36:38 -0800 | [diff] [blame] | 1076 | { |
Avi Kivity | 4db3531 | 2007-11-21 15:28:32 +0200 | [diff] [blame] | 1077 | struct kvm_mmu_page *sp; |
Lai Jiangshan | 2032a93 | 2010-05-26 16:49:59 +0800 | [diff] [blame] | 1078 | gfn_t gfn; |
Izik Eidus | 290fc38 | 2007-09-27 14:11:22 +0200 | [diff] [blame] | 1079 | unsigned long *rmapp; |
Avi Kivity | cd4a4e5 | 2007-01-05 16:36:38 -0800 | [diff] [blame] | 1080 | |
Avi Kivity | 4db3531 | 2007-11-21 15:28:32 +0200 | [diff] [blame] | 1081 | sp = page_header(__pa(spte)); |
Lai Jiangshan | 2032a93 | 2010-05-26 16:49:59 +0800 | [diff] [blame] | 1082 | gfn = kvm_mmu_page_get_gfn(sp, spte - sp->spt); |
| 1083 | rmapp = gfn_to_rmap(kvm, gfn, sp->role.level); |
Xiao Guangrong | 53c07b1 | 2011-05-15 23:26:20 +0800 | [diff] [blame] | 1084 | pte_list_remove(spte, rmapp); |
Avi Kivity | cd4a4e5 | 2007-01-05 16:36:38 -0800 | [diff] [blame] | 1085 | } |
| 1086 | |
Takuya Yoshikawa | 1e3f42f | 2012-03-21 23:50:34 +0900 | [diff] [blame] | 1087 | /* |
| 1088 | * Used by the following functions to iterate through the sptes linked by a |
| 1089 | * rmap. All fields are private and not assumed to be used outside. |
| 1090 | */ |
| 1091 | struct rmap_iterator { |
| 1092 | /* private fields */ |
| 1093 | struct pte_list_desc *desc; /* holds the sptep if not NULL */ |
| 1094 | int pos; /* index of the sptep */ |
| 1095 | }; |
| 1096 | |
| 1097 | /* |
| 1098 | * Iteration must be started by this function. This should also be used after |
| 1099 | * removing/dropping sptes from the rmap link because in such cases the |
| 1100 | * information in the itererator may not be valid. |
| 1101 | * |
| 1102 | * Returns sptep if found, NULL otherwise. |
| 1103 | */ |
| 1104 | static u64 *rmap_get_first(unsigned long rmap, struct rmap_iterator *iter) |
| 1105 | { |
| 1106 | if (!rmap) |
| 1107 | return NULL; |
| 1108 | |
| 1109 | if (!(rmap & 1)) { |
| 1110 | iter->desc = NULL; |
| 1111 | return (u64 *)rmap; |
| 1112 | } |
| 1113 | |
| 1114 | iter->desc = (struct pte_list_desc *)(rmap & ~1ul); |
| 1115 | iter->pos = 0; |
| 1116 | return iter->desc->sptes[iter->pos]; |
| 1117 | } |
| 1118 | |
| 1119 | /* |
| 1120 | * Must be used with a valid iterator: e.g. after rmap_get_first(). |
| 1121 | * |
| 1122 | * Returns sptep if found, NULL otherwise. |
| 1123 | */ |
| 1124 | static u64 *rmap_get_next(struct rmap_iterator *iter) |
| 1125 | { |
| 1126 | if (iter->desc) { |
| 1127 | if (iter->pos < PTE_LIST_EXT - 1) { |
| 1128 | u64 *sptep; |
| 1129 | |
| 1130 | ++iter->pos; |
| 1131 | sptep = iter->desc->sptes[iter->pos]; |
| 1132 | if (sptep) |
| 1133 | return sptep; |
| 1134 | } |
| 1135 | |
| 1136 | iter->desc = iter->desc->more; |
| 1137 | |
| 1138 | if (iter->desc) { |
| 1139 | iter->pos = 0; |
| 1140 | /* desc->sptes[0] cannot be NULL */ |
| 1141 | return iter->desc->sptes[iter->pos]; |
| 1142 | } |
| 1143 | } |
| 1144 | |
| 1145 | return NULL; |
| 1146 | } |
| 1147 | |
Xiao Guangrong | c370795 | 2011-07-12 03:28:04 +0800 | [diff] [blame] | 1148 | static void drop_spte(struct kvm *kvm, u64 *sptep) |
Xiao Guangrong | e4b502e | 2010-07-16 11:28:09 +0800 | [diff] [blame] | 1149 | { |
Xiao Guangrong | 1df9f2d | 2011-07-12 03:30:35 +0800 | [diff] [blame] | 1150 | if (mmu_spte_clear_track_bits(sptep)) |
Marcelo Tosatti | eb45fda | 2010-10-25 11:58:22 -0200 | [diff] [blame] | 1151 | rmap_remove(kvm, sptep); |
Avi Kivity | be38d27 | 2010-06-06 14:31:27 +0300 | [diff] [blame] | 1152 | } |
| 1153 | |
Xiao Guangrong | 8e22f95 | 2012-06-20 15:57:39 +0800 | [diff] [blame] | 1154 | |
| 1155 | static bool __drop_large_spte(struct kvm *kvm, u64 *sptep) |
| 1156 | { |
| 1157 | if (is_large_pte(*sptep)) { |
| 1158 | WARN_ON(page_header(__pa(sptep))->role.level == |
| 1159 | PT_PAGE_TABLE_LEVEL); |
| 1160 | drop_spte(kvm, sptep); |
| 1161 | --kvm->stat.lpages; |
| 1162 | return true; |
| 1163 | } |
| 1164 | |
| 1165 | return false; |
| 1166 | } |
| 1167 | |
| 1168 | static void drop_large_spte(struct kvm_vcpu *vcpu, u64 *sptep) |
| 1169 | { |
| 1170 | if (__drop_large_spte(vcpu->kvm, sptep)) |
| 1171 | kvm_flush_remote_tlbs(vcpu->kvm); |
| 1172 | } |
| 1173 | |
| 1174 | /* |
Xiao Guangrong | 49fde34 | 2012-06-20 15:58:58 +0800 | [diff] [blame] | 1175 | * Write-protect on the specified @sptep, @pt_protect indicates whether |
Xiao Guangrong | c126d94 | 2014-04-17 17:06:14 +0800 | [diff] [blame] | 1176 | * spte write-protection is caused by protecting shadow page table. |
Xiao Guangrong | 49fde34 | 2012-06-20 15:58:58 +0800 | [diff] [blame] | 1177 | * |
| 1178 | * Note: write protection is difference between drity logging and spte |
| 1179 | * protection: |
| 1180 | * - for dirty logging, the spte can be set to writable at anytime if |
| 1181 | * its dirty bitmap is properly set. |
| 1182 | * - for spte protection, the spte can be writable only after unsync-ing |
| 1183 | * shadow page. |
Xiao Guangrong | 8e22f95 | 2012-06-20 15:57:39 +0800 | [diff] [blame] | 1184 | * |
Xiao Guangrong | c126d94 | 2014-04-17 17:06:14 +0800 | [diff] [blame] | 1185 | * Return true if tlb need be flushed. |
Xiao Guangrong | 8e22f95 | 2012-06-20 15:57:39 +0800 | [diff] [blame] | 1186 | */ |
Xiao Guangrong | c126d94 | 2014-04-17 17:06:14 +0800 | [diff] [blame] | 1187 | static bool spte_write_protect(struct kvm *kvm, u64 *sptep, bool pt_protect) |
Xiao Guangrong | d13bc5b | 2012-06-20 15:57:15 +0800 | [diff] [blame] | 1188 | { |
| 1189 | u64 spte = *sptep; |
| 1190 | |
Xiao Guangrong | 49fde34 | 2012-06-20 15:58:58 +0800 | [diff] [blame] | 1191 | if (!is_writable_pte(spte) && |
| 1192 | !(pt_protect && spte_is_locklessly_modifiable(spte))) |
Xiao Guangrong | d13bc5b | 2012-06-20 15:57:15 +0800 | [diff] [blame] | 1193 | return false; |
| 1194 | |
| 1195 | rmap_printk("rmap_write_protect: spte %p %llx\n", sptep, *sptep); |
| 1196 | |
Xiao Guangrong | 49fde34 | 2012-06-20 15:58:58 +0800 | [diff] [blame] | 1197 | if (pt_protect) |
| 1198 | spte &= ~SPTE_MMU_WRITEABLE; |
Xiao Guangrong | d13bc5b | 2012-06-20 15:57:15 +0800 | [diff] [blame] | 1199 | spte = spte & ~PT_WRITABLE_MASK; |
Xiao Guangrong | 49fde34 | 2012-06-20 15:58:58 +0800 | [diff] [blame] | 1200 | |
Xiao Guangrong | c126d94 | 2014-04-17 17:06:14 +0800 | [diff] [blame] | 1201 | return mmu_spte_update(sptep, spte); |
Xiao Guangrong | d13bc5b | 2012-06-20 15:57:15 +0800 | [diff] [blame] | 1202 | } |
| 1203 | |
Xiao Guangrong | 49fde34 | 2012-06-20 15:58:58 +0800 | [diff] [blame] | 1204 | static bool __rmap_write_protect(struct kvm *kvm, unsigned long *rmapp, |
Takuya Yoshikawa | 245c391 | 2013-01-08 19:44:09 +0900 | [diff] [blame] | 1205 | bool pt_protect) |
Takuya Yoshikawa | a0ed460 | 2012-03-01 19:31:22 +0900 | [diff] [blame] | 1206 | { |
Takuya Yoshikawa | 1e3f42f | 2012-03-21 23:50:34 +0900 | [diff] [blame] | 1207 | u64 *sptep; |
| 1208 | struct rmap_iterator iter; |
Xiao Guangrong | d13bc5b | 2012-06-20 15:57:15 +0800 | [diff] [blame] | 1209 | bool flush = false; |
Takuya Yoshikawa | a0ed460 | 2012-03-01 19:31:22 +0900 | [diff] [blame] | 1210 | |
Takuya Yoshikawa | 1e3f42f | 2012-03-21 23:50:34 +0900 | [diff] [blame] | 1211 | for (sptep = rmap_get_first(*rmapp, &iter); sptep;) { |
| 1212 | BUG_ON(!(*sptep & PT_PRESENT_MASK)); |
Takuya Yoshikawa | a0ed460 | 2012-03-01 19:31:22 +0900 | [diff] [blame] | 1213 | |
Xiao Guangrong | c126d94 | 2014-04-17 17:06:14 +0800 | [diff] [blame] | 1214 | flush |= spte_write_protect(kvm, sptep, pt_protect); |
Xiao Guangrong | d13bc5b | 2012-06-20 15:57:15 +0800 | [diff] [blame] | 1215 | sptep = rmap_get_next(&iter); |
Takuya Yoshikawa | a0ed460 | 2012-03-01 19:31:22 +0900 | [diff] [blame] | 1216 | } |
| 1217 | |
Xiao Guangrong | d13bc5b | 2012-06-20 15:57:15 +0800 | [diff] [blame] | 1218 | return flush; |
Takuya Yoshikawa | a0ed460 | 2012-03-01 19:31:22 +0900 | [diff] [blame] | 1219 | } |
| 1220 | |
Takuya Yoshikawa | 5dc99b23 | 2012-03-01 19:32:16 +0900 | [diff] [blame] | 1221 | /** |
| 1222 | * kvm_mmu_write_protect_pt_masked - write protect selected PT level pages |
| 1223 | * @kvm: kvm instance |
| 1224 | * @slot: slot to protect |
| 1225 | * @gfn_offset: start of the BITS_PER_LONG pages we care about |
| 1226 | * @mask: indicates which pages we should protect |
| 1227 | * |
| 1228 | * Used when we do not need to care about huge page mappings: e.g. during dirty |
| 1229 | * logging we do not have any such mappings. |
| 1230 | */ |
| 1231 | void kvm_mmu_write_protect_pt_masked(struct kvm *kvm, |
| 1232 | struct kvm_memory_slot *slot, |
| 1233 | gfn_t gfn_offset, unsigned long mask) |
Izik Eidus | 98348e9 | 2007-10-16 14:42:30 +0200 | [diff] [blame] | 1234 | { |
Izik Eidus | 290fc38 | 2007-09-27 14:11:22 +0200 | [diff] [blame] | 1235 | unsigned long *rmapp; |
Takuya Yoshikawa | 5dc99b23 | 2012-03-01 19:32:16 +0900 | [diff] [blame] | 1236 | |
| 1237 | while (mask) { |
Takuya Yoshikawa | 65fbe37 | 2012-08-01 18:02:01 +0900 | [diff] [blame] | 1238 | rmapp = __gfn_to_rmap(slot->base_gfn + gfn_offset + __ffs(mask), |
| 1239 | PT_PAGE_TABLE_LEVEL, slot); |
Takuya Yoshikawa | 245c391 | 2013-01-08 19:44:09 +0900 | [diff] [blame] | 1240 | __rmap_write_protect(kvm, rmapp, false); |
Takuya Yoshikawa | 5dc99b23 | 2012-03-01 19:32:16 +0900 | [diff] [blame] | 1241 | |
| 1242 | /* clear the first set bit */ |
| 1243 | mask &= mask - 1; |
| 1244 | } |
| 1245 | } |
| 1246 | |
Xiao Guangrong | 2f84569 | 2012-06-20 15:56:53 +0800 | [diff] [blame] | 1247 | static bool rmap_write_protect(struct kvm *kvm, u64 gfn) |
Takuya Yoshikawa | 5dc99b23 | 2012-03-01 19:32:16 +0900 | [diff] [blame] | 1248 | { |
| 1249 | struct kvm_memory_slot *slot; |
| 1250 | unsigned long *rmapp; |
| 1251 | int i; |
Xiao Guangrong | 2f84569 | 2012-06-20 15:56:53 +0800 | [diff] [blame] | 1252 | bool write_protected = false; |
Takuya Yoshikawa | 5dc99b23 | 2012-03-01 19:32:16 +0900 | [diff] [blame] | 1253 | |
| 1254 | slot = gfn_to_memslot(kvm, gfn); |
Avi Kivity | 374cbac | 2007-01-05 16:36:43 -0800 | [diff] [blame] | 1255 | |
Takuya Yoshikawa | a0ed460 | 2012-03-01 19:31:22 +0900 | [diff] [blame] | 1256 | for (i = PT_PAGE_TABLE_LEVEL; |
Joerg Roedel | 44ad994 | 2009-07-27 16:30:42 +0200 | [diff] [blame] | 1257 | i < PT_PAGE_TABLE_LEVEL + KVM_NR_PAGE_SIZES; ++i) { |
Takuya Yoshikawa | 9373e2c0 | 2012-01-17 19:51:20 +0900 | [diff] [blame] | 1258 | rmapp = __gfn_to_rmap(gfn, i, slot); |
Takuya Yoshikawa | 245c391 | 2013-01-08 19:44:09 +0900 | [diff] [blame] | 1259 | write_protected |= __rmap_write_protect(kvm, rmapp, true); |
Marcelo Tosatti | 05da455 | 2008-02-23 11:44:30 -0300 | [diff] [blame] | 1260 | } |
| 1261 | |
Marcelo Tosatti | b1a3682 | 2008-12-01 22:32:03 -0200 | [diff] [blame] | 1262 | return write_protected; |
Avi Kivity | 374cbac | 2007-01-05 16:36:43 -0800 | [diff] [blame] | 1263 | } |
| 1264 | |
Frederik Deweerdt | 8a8365c | 2009-10-09 11:42:56 +0000 | [diff] [blame] | 1265 | static int kvm_unmap_rmapp(struct kvm *kvm, unsigned long *rmapp, |
Takuya Yoshikawa | 048212d | 2012-07-02 17:57:59 +0900 | [diff] [blame] | 1266 | struct kvm_memory_slot *slot, unsigned long data) |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 1267 | { |
Takuya Yoshikawa | 1e3f42f | 2012-03-21 23:50:34 +0900 | [diff] [blame] | 1268 | u64 *sptep; |
| 1269 | struct rmap_iterator iter; |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 1270 | int need_tlb_flush = 0; |
| 1271 | |
Takuya Yoshikawa | 1e3f42f | 2012-03-21 23:50:34 +0900 | [diff] [blame] | 1272 | while ((sptep = rmap_get_first(*rmapp, &iter))) { |
| 1273 | BUG_ON(!(*sptep & PT_PRESENT_MASK)); |
| 1274 | rmap_printk("kvm_rmap_unmap_hva: spte %p %llx\n", sptep, *sptep); |
| 1275 | |
| 1276 | drop_spte(kvm, sptep); |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 1277 | need_tlb_flush = 1; |
| 1278 | } |
Takuya Yoshikawa | 1e3f42f | 2012-03-21 23:50:34 +0900 | [diff] [blame] | 1279 | |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 1280 | return need_tlb_flush; |
| 1281 | } |
| 1282 | |
Frederik Deweerdt | 8a8365c | 2009-10-09 11:42:56 +0000 | [diff] [blame] | 1283 | static int kvm_set_pte_rmapp(struct kvm *kvm, unsigned long *rmapp, |
Takuya Yoshikawa | 048212d | 2012-07-02 17:57:59 +0900 | [diff] [blame] | 1284 | struct kvm_memory_slot *slot, unsigned long data) |
Izik Eidus | 3da0dd4 | 2009-09-23 21:47:18 +0300 | [diff] [blame] | 1285 | { |
Takuya Yoshikawa | 1e3f42f | 2012-03-21 23:50:34 +0900 | [diff] [blame] | 1286 | u64 *sptep; |
| 1287 | struct rmap_iterator iter; |
Izik Eidus | 3da0dd4 | 2009-09-23 21:47:18 +0300 | [diff] [blame] | 1288 | int need_flush = 0; |
Takuya Yoshikawa | 1e3f42f | 2012-03-21 23:50:34 +0900 | [diff] [blame] | 1289 | u64 new_spte; |
Izik Eidus | 3da0dd4 | 2009-09-23 21:47:18 +0300 | [diff] [blame] | 1290 | pte_t *ptep = (pte_t *)data; |
| 1291 | pfn_t new_pfn; |
| 1292 | |
| 1293 | WARN_ON(pte_huge(*ptep)); |
| 1294 | new_pfn = pte_pfn(*ptep); |
Takuya Yoshikawa | 1e3f42f | 2012-03-21 23:50:34 +0900 | [diff] [blame] | 1295 | |
| 1296 | for (sptep = rmap_get_first(*rmapp, &iter); sptep;) { |
| 1297 | BUG_ON(!is_shadow_present_pte(*sptep)); |
| 1298 | rmap_printk("kvm_set_pte_rmapp: spte %p %llx\n", sptep, *sptep); |
| 1299 | |
Izik Eidus | 3da0dd4 | 2009-09-23 21:47:18 +0300 | [diff] [blame] | 1300 | need_flush = 1; |
Takuya Yoshikawa | 1e3f42f | 2012-03-21 23:50:34 +0900 | [diff] [blame] | 1301 | |
Izik Eidus | 3da0dd4 | 2009-09-23 21:47:18 +0300 | [diff] [blame] | 1302 | if (pte_write(*ptep)) { |
Takuya Yoshikawa | 1e3f42f | 2012-03-21 23:50:34 +0900 | [diff] [blame] | 1303 | drop_spte(kvm, sptep); |
| 1304 | sptep = rmap_get_first(*rmapp, &iter); |
Izik Eidus | 3da0dd4 | 2009-09-23 21:47:18 +0300 | [diff] [blame] | 1305 | } else { |
Takuya Yoshikawa | 1e3f42f | 2012-03-21 23:50:34 +0900 | [diff] [blame] | 1306 | new_spte = *sptep & ~PT64_BASE_ADDR_MASK; |
Izik Eidus | 3da0dd4 | 2009-09-23 21:47:18 +0300 | [diff] [blame] | 1307 | new_spte |= (u64)new_pfn << PAGE_SHIFT; |
| 1308 | |
| 1309 | new_spte &= ~PT_WRITABLE_MASK; |
| 1310 | new_spte &= ~SPTE_HOST_WRITEABLE; |
Avi Kivity | b79b93f | 2010-06-06 15:46:44 +0300 | [diff] [blame] | 1311 | new_spte &= ~shadow_accessed_mask; |
Takuya Yoshikawa | 1e3f42f | 2012-03-21 23:50:34 +0900 | [diff] [blame] | 1312 | |
| 1313 | mmu_spte_clear_track_bits(sptep); |
| 1314 | mmu_spte_set(sptep, new_spte); |
| 1315 | sptep = rmap_get_next(&iter); |
Izik Eidus | 3da0dd4 | 2009-09-23 21:47:18 +0300 | [diff] [blame] | 1316 | } |
| 1317 | } |
Takuya Yoshikawa | 1e3f42f | 2012-03-21 23:50:34 +0900 | [diff] [blame] | 1318 | |
Izik Eidus | 3da0dd4 | 2009-09-23 21:47:18 +0300 | [diff] [blame] | 1319 | if (need_flush) |
| 1320 | kvm_flush_remote_tlbs(kvm); |
| 1321 | |
| 1322 | return 0; |
| 1323 | } |
| 1324 | |
Takuya Yoshikawa | 84504ef | 2012-07-02 17:55:48 +0900 | [diff] [blame] | 1325 | static int kvm_handle_hva_range(struct kvm *kvm, |
| 1326 | unsigned long start, |
| 1327 | unsigned long end, |
| 1328 | unsigned long data, |
| 1329 | int (*handler)(struct kvm *kvm, |
| 1330 | unsigned long *rmapp, |
Takuya Yoshikawa | 048212d | 2012-07-02 17:57:59 +0900 | [diff] [blame] | 1331 | struct kvm_memory_slot *slot, |
Takuya Yoshikawa | 84504ef | 2012-07-02 17:55:48 +0900 | [diff] [blame] | 1332 | unsigned long data)) |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 1333 | { |
Xiao Guangrong | be6ba0f | 2011-11-24 17:39:18 +0800 | [diff] [blame] | 1334 | int j; |
Takuya Yoshikawa | f395302 | 2012-07-02 17:58:48 +0900 | [diff] [blame] | 1335 | int ret = 0; |
Marcelo Tosatti | bc6678a | 2009-12-23 14:35:21 -0200 | [diff] [blame] | 1336 | struct kvm_memslots *slots; |
Xiao Guangrong | be6ba0f | 2011-11-24 17:39:18 +0800 | [diff] [blame] | 1337 | struct kvm_memory_slot *memslot; |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 1338 | |
Lai Jiangshan | 90d83dc | 2010-04-19 17:41:23 +0800 | [diff] [blame] | 1339 | slots = kvm_memslots(kvm); |
Marcelo Tosatti | bc6678a | 2009-12-23 14:35:21 -0200 | [diff] [blame] | 1340 | |
Xiao Guangrong | be6ba0f | 2011-11-24 17:39:18 +0800 | [diff] [blame] | 1341 | kvm_for_each_memslot(memslot, slots) { |
Takuya Yoshikawa | 84504ef | 2012-07-02 17:55:48 +0900 | [diff] [blame] | 1342 | unsigned long hva_start, hva_end; |
Takuya Yoshikawa | bcd3ef5 | 2012-07-02 17:59:33 +0900 | [diff] [blame] | 1343 | gfn_t gfn_start, gfn_end; |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 1344 | |
Takuya Yoshikawa | 84504ef | 2012-07-02 17:55:48 +0900 | [diff] [blame] | 1345 | hva_start = max(start, memslot->userspace_addr); |
| 1346 | hva_end = min(end, memslot->userspace_addr + |
| 1347 | (memslot->npages << PAGE_SHIFT)); |
| 1348 | if (hva_start >= hva_end) |
| 1349 | continue; |
| 1350 | /* |
| 1351 | * {gfn(page) | page intersects with [hva_start, hva_end)} = |
Takuya Yoshikawa | bcd3ef5 | 2012-07-02 17:59:33 +0900 | [diff] [blame] | 1352 | * {gfn_start, gfn_start+1, ..., gfn_end-1}. |
Takuya Yoshikawa | 84504ef | 2012-07-02 17:55:48 +0900 | [diff] [blame] | 1353 | */ |
Takuya Yoshikawa | bcd3ef5 | 2012-07-02 17:59:33 +0900 | [diff] [blame] | 1354 | gfn_start = hva_to_gfn_memslot(hva_start, memslot); |
Takuya Yoshikawa | 84504ef | 2012-07-02 17:55:48 +0900 | [diff] [blame] | 1355 | gfn_end = hva_to_gfn_memslot(hva_end + PAGE_SIZE - 1, memslot); |
Joerg Roedel | 852e3c1 | 2009-07-27 16:30:44 +0200 | [diff] [blame] | 1356 | |
Takuya Yoshikawa | bcd3ef5 | 2012-07-02 17:59:33 +0900 | [diff] [blame] | 1357 | for (j = PT_PAGE_TABLE_LEVEL; |
| 1358 | j < PT_PAGE_TABLE_LEVEL + KVM_NR_PAGE_SIZES; ++j) { |
| 1359 | unsigned long idx, idx_end; |
| 1360 | unsigned long *rmapp; |
Joerg Roedel | 852e3c1 | 2009-07-27 16:30:44 +0200 | [diff] [blame] | 1361 | |
Takuya Yoshikawa | bcd3ef5 | 2012-07-02 17:59:33 +0900 | [diff] [blame] | 1362 | /* |
| 1363 | * {idx(page_j) | page_j intersects with |
| 1364 | * [hva_start, hva_end)} = {idx, idx+1, ..., idx_end}. |
| 1365 | */ |
| 1366 | idx = gfn_to_index(gfn_start, memslot->base_gfn, j); |
| 1367 | idx_end = gfn_to_index(gfn_end - 1, memslot->base_gfn, j); |
Andrea Arcangeli | 6e3e243 | 2010-07-16 11:52:55 +0200 | [diff] [blame] | 1368 | |
Takuya Yoshikawa | bcd3ef5 | 2012-07-02 17:59:33 +0900 | [diff] [blame] | 1369 | rmapp = __gfn_to_rmap(gfn_start, j, memslot); |
| 1370 | |
| 1371 | for (; idx <= idx_end; ++idx) |
| 1372 | ret |= handler(kvm, rmapp++, memslot, data); |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 1373 | } |
| 1374 | } |
| 1375 | |
Takuya Yoshikawa | f395302 | 2012-07-02 17:58:48 +0900 | [diff] [blame] | 1376 | return ret; |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 1377 | } |
| 1378 | |
Takuya Yoshikawa | 84504ef | 2012-07-02 17:55:48 +0900 | [diff] [blame] | 1379 | static int kvm_handle_hva(struct kvm *kvm, unsigned long hva, |
| 1380 | unsigned long data, |
| 1381 | int (*handler)(struct kvm *kvm, unsigned long *rmapp, |
Takuya Yoshikawa | 048212d | 2012-07-02 17:57:59 +0900 | [diff] [blame] | 1382 | struct kvm_memory_slot *slot, |
Takuya Yoshikawa | 84504ef | 2012-07-02 17:55:48 +0900 | [diff] [blame] | 1383 | unsigned long data)) |
| 1384 | { |
| 1385 | return kvm_handle_hva_range(kvm, hva, hva + 1, data, handler); |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 1386 | } |
| 1387 | |
| 1388 | int kvm_unmap_hva(struct kvm *kvm, unsigned long hva) |
| 1389 | { |
Izik Eidus | 3da0dd4 | 2009-09-23 21:47:18 +0300 | [diff] [blame] | 1390 | return kvm_handle_hva(kvm, hva, 0, kvm_unmap_rmapp); |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 1391 | } |
| 1392 | |
Takuya Yoshikawa | b3ae209 | 2012-07-02 17:56:33 +0900 | [diff] [blame] | 1393 | int kvm_unmap_hva_range(struct kvm *kvm, unsigned long start, unsigned long end) |
| 1394 | { |
| 1395 | return kvm_handle_hva_range(kvm, start, end, 0, kvm_unmap_rmapp); |
| 1396 | } |
| 1397 | |
Izik Eidus | 3da0dd4 | 2009-09-23 21:47:18 +0300 | [diff] [blame] | 1398 | void kvm_set_spte_hva(struct kvm *kvm, unsigned long hva, pte_t pte) |
| 1399 | { |
Frederik Deweerdt | 8a8365c | 2009-10-09 11:42:56 +0000 | [diff] [blame] | 1400 | kvm_handle_hva(kvm, hva, (unsigned long)&pte, kvm_set_pte_rmapp); |
Izik Eidus | 3da0dd4 | 2009-09-23 21:47:18 +0300 | [diff] [blame] | 1401 | } |
| 1402 | |
Frederik Deweerdt | 8a8365c | 2009-10-09 11:42:56 +0000 | [diff] [blame] | 1403 | static int kvm_age_rmapp(struct kvm *kvm, unsigned long *rmapp, |
Takuya Yoshikawa | 048212d | 2012-07-02 17:57:59 +0900 | [diff] [blame] | 1404 | struct kvm_memory_slot *slot, unsigned long data) |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 1405 | { |
Takuya Yoshikawa | 1e3f42f | 2012-03-21 23:50:34 +0900 | [diff] [blame] | 1406 | u64 *sptep; |
Michael S. Tsirkin | 79f702a | 2012-06-03 11:34:08 +0300 | [diff] [blame] | 1407 | struct rmap_iterator uninitialized_var(iter); |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 1408 | int young = 0; |
| 1409 | |
Rik van Riel | 6316e1c | 2010-02-03 16:11:03 -0500 | [diff] [blame] | 1410 | /* |
Xudong Hao | 3f6d8c8 | 2012-05-22 11:23:15 +0800 | [diff] [blame] | 1411 | * In case of absence of EPT Access and Dirty Bits supports, |
| 1412 | * emulate the accessed bit for EPT, by checking if this page has |
Rik van Riel | 6316e1c | 2010-02-03 16:11:03 -0500 | [diff] [blame] | 1413 | * an EPT mapping, and clearing it if it does. On the next access, |
| 1414 | * a new EPT mapping will be established. |
| 1415 | * This has some overhead, but not as much as the cost of swapping |
| 1416 | * out actively used pages or breaking up actively used hugepages. |
| 1417 | */ |
Takuya Yoshikawa | f395302 | 2012-07-02 17:58:48 +0900 | [diff] [blame] | 1418 | if (!shadow_accessed_mask) { |
| 1419 | young = kvm_unmap_rmapp(kvm, rmapp, slot, data); |
| 1420 | goto out; |
| 1421 | } |
Sheng Yang | 534e38b | 2008-09-08 15:12:30 +0800 | [diff] [blame] | 1422 | |
Takuya Yoshikawa | 1e3f42f | 2012-03-21 23:50:34 +0900 | [diff] [blame] | 1423 | for (sptep = rmap_get_first(*rmapp, &iter); sptep; |
| 1424 | sptep = rmap_get_next(&iter)) { |
Xudong Hao | 3f6d8c8 | 2012-05-22 11:23:15 +0800 | [diff] [blame] | 1425 | BUG_ON(!is_shadow_present_pte(*sptep)); |
Takuya Yoshikawa | 1e3f42f | 2012-03-21 23:50:34 +0900 | [diff] [blame] | 1426 | |
Xudong Hao | 3f6d8c8 | 2012-05-22 11:23:15 +0800 | [diff] [blame] | 1427 | if (*sptep & shadow_accessed_mask) { |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 1428 | young = 1; |
Xudong Hao | 3f6d8c8 | 2012-05-22 11:23:15 +0800 | [diff] [blame] | 1429 | clear_bit((ffs(shadow_accessed_mask) - 1), |
| 1430 | (unsigned long *)sptep); |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 1431 | } |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 1432 | } |
Takuya Yoshikawa | f395302 | 2012-07-02 17:58:48 +0900 | [diff] [blame] | 1433 | out: |
| 1434 | /* @data has hva passed to kvm_age_hva(). */ |
| 1435 | trace_kvm_age_page(data, slot, young); |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 1436 | return young; |
| 1437 | } |
| 1438 | |
Andrea Arcangeli | 8ee5382 | 2011-01-13 15:47:10 -0800 | [diff] [blame] | 1439 | static int kvm_test_age_rmapp(struct kvm *kvm, unsigned long *rmapp, |
Takuya Yoshikawa | 048212d | 2012-07-02 17:57:59 +0900 | [diff] [blame] | 1440 | struct kvm_memory_slot *slot, unsigned long data) |
Andrea Arcangeli | 8ee5382 | 2011-01-13 15:47:10 -0800 | [diff] [blame] | 1441 | { |
Takuya Yoshikawa | 1e3f42f | 2012-03-21 23:50:34 +0900 | [diff] [blame] | 1442 | u64 *sptep; |
| 1443 | struct rmap_iterator iter; |
Andrea Arcangeli | 8ee5382 | 2011-01-13 15:47:10 -0800 | [diff] [blame] | 1444 | int young = 0; |
| 1445 | |
| 1446 | /* |
| 1447 | * If there's no access bit in the secondary pte set by the |
| 1448 | * hardware it's up to gup-fast/gup to set the access bit in |
| 1449 | * the primary pte or in the page structure. |
| 1450 | */ |
| 1451 | if (!shadow_accessed_mask) |
| 1452 | goto out; |
| 1453 | |
Takuya Yoshikawa | 1e3f42f | 2012-03-21 23:50:34 +0900 | [diff] [blame] | 1454 | for (sptep = rmap_get_first(*rmapp, &iter); sptep; |
| 1455 | sptep = rmap_get_next(&iter)) { |
Xudong Hao | 3f6d8c8 | 2012-05-22 11:23:15 +0800 | [diff] [blame] | 1456 | BUG_ON(!is_shadow_present_pte(*sptep)); |
Takuya Yoshikawa | 1e3f42f | 2012-03-21 23:50:34 +0900 | [diff] [blame] | 1457 | |
Xudong Hao | 3f6d8c8 | 2012-05-22 11:23:15 +0800 | [diff] [blame] | 1458 | if (*sptep & shadow_accessed_mask) { |
Andrea Arcangeli | 8ee5382 | 2011-01-13 15:47:10 -0800 | [diff] [blame] | 1459 | young = 1; |
| 1460 | break; |
| 1461 | } |
Andrea Arcangeli | 8ee5382 | 2011-01-13 15:47:10 -0800 | [diff] [blame] | 1462 | } |
| 1463 | out: |
| 1464 | return young; |
| 1465 | } |
| 1466 | |
Marcelo Tosatti | 53a27b3 | 2009-08-05 15:43:58 -0300 | [diff] [blame] | 1467 | #define RMAP_RECYCLE_THRESHOLD 1000 |
| 1468 | |
Joerg Roedel | 852e3c1 | 2009-07-27 16:30:44 +0200 | [diff] [blame] | 1469 | static void rmap_recycle(struct kvm_vcpu *vcpu, u64 *spte, gfn_t gfn) |
Marcelo Tosatti | 53a27b3 | 2009-08-05 15:43:58 -0300 | [diff] [blame] | 1470 | { |
| 1471 | unsigned long *rmapp; |
Joerg Roedel | 852e3c1 | 2009-07-27 16:30:44 +0200 | [diff] [blame] | 1472 | struct kvm_mmu_page *sp; |
| 1473 | |
| 1474 | sp = page_header(__pa(spte)); |
Marcelo Tosatti | 53a27b3 | 2009-08-05 15:43:58 -0300 | [diff] [blame] | 1475 | |
Joerg Roedel | 852e3c1 | 2009-07-27 16:30:44 +0200 | [diff] [blame] | 1476 | rmapp = gfn_to_rmap(vcpu->kvm, gfn, sp->role.level); |
Marcelo Tosatti | 53a27b3 | 2009-08-05 15:43:58 -0300 | [diff] [blame] | 1477 | |
Takuya Yoshikawa | 048212d | 2012-07-02 17:57:59 +0900 | [diff] [blame] | 1478 | kvm_unmap_rmapp(vcpu->kvm, rmapp, NULL, 0); |
Marcelo Tosatti | 53a27b3 | 2009-08-05 15:43:58 -0300 | [diff] [blame] | 1479 | kvm_flush_remote_tlbs(vcpu->kvm); |
| 1480 | } |
| 1481 | |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 1482 | int kvm_age_hva(struct kvm *kvm, unsigned long hva) |
| 1483 | { |
Takuya Yoshikawa | f395302 | 2012-07-02 17:58:48 +0900 | [diff] [blame] | 1484 | return kvm_handle_hva(kvm, hva, hva, kvm_age_rmapp); |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 1485 | } |
| 1486 | |
Andrea Arcangeli | 8ee5382 | 2011-01-13 15:47:10 -0800 | [diff] [blame] | 1487 | int kvm_test_age_hva(struct kvm *kvm, unsigned long hva) |
| 1488 | { |
| 1489 | return kvm_handle_hva(kvm, hva, 0, kvm_test_age_rmapp); |
| 1490 | } |
| 1491 | |
Yaozu Dong | d6c69ee | 2007-04-25 14:17:25 +0800 | [diff] [blame] | 1492 | #ifdef MMU_DEBUG |
Avi Kivity | 47ad8e6 | 2007-05-06 15:50:58 +0300 | [diff] [blame] | 1493 | static int is_empty_shadow_page(u64 *spt) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1494 | { |
Avi Kivity | 139bdb2 | 2007-01-05 16:36:50 -0800 | [diff] [blame] | 1495 | u64 *pos; |
| 1496 | u64 *end; |
| 1497 | |
Avi Kivity | 47ad8e6 | 2007-05-06 15:50:58 +0300 | [diff] [blame] | 1498 | for (pos = spt, end = pos + PAGE_SIZE / sizeof(u64); pos != end; pos++) |
Avi Kivity | 3c91551 | 2008-05-20 16:21:13 +0300 | [diff] [blame] | 1499 | if (is_shadow_present_pte(*pos)) { |
Harvey Harrison | b8688d5 | 2008-03-03 12:59:56 -0800 | [diff] [blame] | 1500 | printk(KERN_ERR "%s: %p %llx\n", __func__, |
Avi Kivity | 139bdb2 | 2007-01-05 16:36:50 -0800 | [diff] [blame] | 1501 | pos, *pos); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1502 | return 0; |
Avi Kivity | 139bdb2 | 2007-01-05 16:36:50 -0800 | [diff] [blame] | 1503 | } |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1504 | return 1; |
| 1505 | } |
Yaozu Dong | d6c69ee | 2007-04-25 14:17:25 +0800 | [diff] [blame] | 1506 | #endif |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1507 | |
Dave Hansen | 45221ab | 2010-08-19 18:11:37 -0700 | [diff] [blame] | 1508 | /* |
| 1509 | * This value is the sum of all of the kvm instances's |
| 1510 | * kvm->arch.n_used_mmu_pages values. We need a global, |
| 1511 | * aggregate version in order to make the slab shrinker |
| 1512 | * faster |
| 1513 | */ |
| 1514 | static inline void kvm_mod_used_mmu_pages(struct kvm *kvm, int nr) |
| 1515 | { |
| 1516 | kvm->arch.n_used_mmu_pages += nr; |
| 1517 | percpu_counter_add(&kvm_total_used_mmu_pages, nr); |
| 1518 | } |
| 1519 | |
Gleb Natapov | 834be0d | 2013-01-30 16:45:05 +0200 | [diff] [blame] | 1520 | static void kvm_mmu_free_page(struct kvm_mmu_page *sp) |
Avi Kivity | 260746c | 2007-01-05 16:36:49 -0800 | [diff] [blame] | 1521 | { |
Avi Kivity | 4db3531 | 2007-11-21 15:28:32 +0200 | [diff] [blame] | 1522 | ASSERT(is_empty_shadow_page(sp->spt)); |
Xiao Guangrong | 7775834 | 2010-06-04 21:53:54 +0800 | [diff] [blame] | 1523 | hlist_del(&sp->hash_link); |
Xiao Guangrong | bd4c86e | 2011-07-12 03:27:14 +0800 | [diff] [blame] | 1524 | list_del(&sp->link); |
| 1525 | free_page((unsigned long)sp->spt); |
Gleb Natapov | 834be0d | 2013-01-30 16:45:05 +0200 | [diff] [blame] | 1526 | if (!sp->role.direct) |
| 1527 | free_page((unsigned long)sp->gfns); |
Xiao Guangrong | e8ad9a7 | 2010-05-13 10:06:02 +0800 | [diff] [blame] | 1528 | kmem_cache_free(mmu_page_header_cache, sp); |
Avi Kivity | 260746c | 2007-01-05 16:36:49 -0800 | [diff] [blame] | 1529 | } |
| 1530 | |
Avi Kivity | cea0f0e | 2007-01-05 16:36:43 -0800 | [diff] [blame] | 1531 | static unsigned kvm_page_table_hashfn(gfn_t gfn) |
| 1532 | { |
Dong, Eddie | 1ae0a13 | 2008-01-07 13:20:25 +0200 | [diff] [blame] | 1533 | return gfn & ((1 << KVM_MMU_HASH_SHIFT) - 1); |
Avi Kivity | cea0f0e | 2007-01-05 16:36:43 -0800 | [diff] [blame] | 1534 | } |
| 1535 | |
Xiao Guangrong | 67052b3 | 2011-05-15 23:27:08 +0800 | [diff] [blame] | 1536 | static void mmu_page_add_parent_pte(struct kvm_vcpu *vcpu, |
| 1537 | struct kvm_mmu_page *sp, u64 *parent_pte) |
| 1538 | { |
| 1539 | if (!parent_pte) |
| 1540 | return; |
| 1541 | |
| 1542 | pte_list_add(vcpu, parent_pte, &sp->parent_ptes); |
| 1543 | } |
| 1544 | |
| 1545 | static void mmu_page_remove_parent_pte(struct kvm_mmu_page *sp, |
| 1546 | u64 *parent_pte) |
| 1547 | { |
| 1548 | pte_list_remove(parent_pte, &sp->parent_ptes); |
| 1549 | } |
| 1550 | |
Xiao Guangrong | bcdd9a9 | 2011-05-15 23:28:29 +0800 | [diff] [blame] | 1551 | static void drop_parent_pte(struct kvm_mmu_page *sp, |
| 1552 | u64 *parent_pte) |
| 1553 | { |
| 1554 | mmu_page_remove_parent_pte(sp, parent_pte); |
Xiao Guangrong | 1df9f2d | 2011-07-12 03:30:35 +0800 | [diff] [blame] | 1555 | mmu_spte_clear_no_track(parent_pte); |
Xiao Guangrong | bcdd9a9 | 2011-05-15 23:28:29 +0800 | [diff] [blame] | 1556 | } |
| 1557 | |
Avi Kivity | 25c0de2 | 2007-01-05 16:36:42 -0800 | [diff] [blame] | 1558 | static struct kvm_mmu_page *kvm_mmu_alloc_page(struct kvm_vcpu *vcpu, |
Lai Jiangshan | 2032a93 | 2010-05-26 16:49:59 +0800 | [diff] [blame] | 1559 | u64 *parent_pte, int direct) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1560 | { |
Avi Kivity | 4db3531 | 2007-11-21 15:28:32 +0200 | [diff] [blame] | 1561 | struct kvm_mmu_page *sp; |
Takuya Yoshikawa | 7ddca7e | 2013-03-21 19:33:43 +0900 | [diff] [blame] | 1562 | |
Takuya Yoshikawa | 80feb89 | 2012-05-29 23:54:26 +0900 | [diff] [blame] | 1563 | sp = mmu_memory_cache_alloc(&vcpu->arch.mmu_page_header_cache); |
| 1564 | sp->spt = mmu_memory_cache_alloc(&vcpu->arch.mmu_page_cache); |
Lai Jiangshan | 2032a93 | 2010-05-26 16:49:59 +0800 | [diff] [blame] | 1565 | if (!direct) |
Takuya Yoshikawa | 80feb89 | 2012-05-29 23:54:26 +0900 | [diff] [blame] | 1566 | sp->gfns = mmu_memory_cache_alloc(&vcpu->arch.mmu_page_cache); |
Avi Kivity | 4db3531 | 2007-11-21 15:28:32 +0200 | [diff] [blame] | 1567 | set_page_private(virt_to_page(sp->spt), (unsigned long)sp); |
Xiao Guangrong | 5304b8d | 2013-05-31 08:36:22 +0800 | [diff] [blame] | 1568 | |
| 1569 | /* |
| 1570 | * The active_mmu_pages list is the FIFO list, do not move the |
| 1571 | * page until it is zapped. kvm_zap_obsolete_pages depends on |
| 1572 | * this feature. See the comments in kvm_zap_obsolete_pages(). |
| 1573 | */ |
Zhang Xiantao | f05e70a | 2007-12-14 10:01:48 +0800 | [diff] [blame] | 1574 | list_add(&sp->link, &vcpu->kvm->arch.active_mmu_pages); |
Xiao Guangrong | 67052b3 | 2011-05-15 23:27:08 +0800 | [diff] [blame] | 1575 | sp->parent_ptes = 0; |
| 1576 | mmu_page_add_parent_pte(vcpu, sp, parent_pte); |
Dave Hansen | 45221ab | 2010-08-19 18:11:37 -0700 | [diff] [blame] | 1577 | kvm_mod_used_mmu_pages(vcpu->kvm, +1); |
Avi Kivity | 4db3531 | 2007-11-21 15:28:32 +0200 | [diff] [blame] | 1578 | return sp; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1579 | } |
| 1580 | |
Xiao Guangrong | 67052b3 | 2011-05-15 23:27:08 +0800 | [diff] [blame] | 1581 | static void mark_unsync(u64 *spte); |
Xiao Guangrong | 6b18493 | 2010-04-16 21:29:17 +0800 | [diff] [blame] | 1582 | static void kvm_mmu_mark_parents_unsync(struct kvm_mmu_page *sp) |
Marcelo Tosatti | 0074ff6 | 2008-09-23 13:18:40 -0300 | [diff] [blame] | 1583 | { |
Xiao Guangrong | 67052b3 | 2011-05-15 23:27:08 +0800 | [diff] [blame] | 1584 | pte_list_walk(&sp->parent_ptes, mark_unsync); |
Xiao Guangrong | 1047df1 | 2010-06-11 21:35:15 +0800 | [diff] [blame] | 1585 | } |
| 1586 | |
Xiao Guangrong | 67052b3 | 2011-05-15 23:27:08 +0800 | [diff] [blame] | 1587 | static void mark_unsync(u64 *spte) |
Xiao Guangrong | 1047df1 | 2010-06-11 21:35:15 +0800 | [diff] [blame] | 1588 | { |
Xiao Guangrong | 67052b3 | 2011-05-15 23:27:08 +0800 | [diff] [blame] | 1589 | struct kvm_mmu_page *sp; |
Xiao Guangrong | 1047df1 | 2010-06-11 21:35:15 +0800 | [diff] [blame] | 1590 | unsigned int index; |
| 1591 | |
Xiao Guangrong | 67052b3 | 2011-05-15 23:27:08 +0800 | [diff] [blame] | 1592 | sp = page_header(__pa(spte)); |
Xiao Guangrong | 1047df1 | 2010-06-11 21:35:15 +0800 | [diff] [blame] | 1593 | index = spte - sp->spt; |
| 1594 | if (__test_and_set_bit(index, sp->unsync_child_bitmap)) |
| 1595 | return; |
| 1596 | if (sp->unsync_children++) |
| 1597 | return; |
| 1598 | kvm_mmu_mark_parents_unsync(sp); |
Marcelo Tosatti | 0074ff6 | 2008-09-23 13:18:40 -0300 | [diff] [blame] | 1599 | } |
| 1600 | |
Marcelo Tosatti | e8bc217 | 2008-09-23 13:18:33 -0300 | [diff] [blame] | 1601 | static int nonpaging_sync_page(struct kvm_vcpu *vcpu, |
Xiao Guangrong | a4a8e6f | 2010-11-19 17:04:03 +0800 | [diff] [blame] | 1602 | struct kvm_mmu_page *sp) |
Marcelo Tosatti | e8bc217 | 2008-09-23 13:18:33 -0300 | [diff] [blame] | 1603 | { |
| 1604 | return 1; |
| 1605 | } |
| 1606 | |
Marcelo Tosatti | a705289 | 2008-09-23 13:18:35 -0300 | [diff] [blame] | 1607 | static void nonpaging_invlpg(struct kvm_vcpu *vcpu, gva_t gva) |
| 1608 | { |
| 1609 | } |
| 1610 | |
Xiao Guangrong | 0f53b5b | 2011-03-09 15:43:51 +0800 | [diff] [blame] | 1611 | static void nonpaging_update_pte(struct kvm_vcpu *vcpu, |
| 1612 | struct kvm_mmu_page *sp, u64 *spte, |
Xiao Guangrong | 7c56252 | 2011-03-28 10:29:27 +0800 | [diff] [blame] | 1613 | const void *pte) |
Xiao Guangrong | 0f53b5b | 2011-03-09 15:43:51 +0800 | [diff] [blame] | 1614 | { |
| 1615 | WARN_ON(1); |
| 1616 | } |
| 1617 | |
Marcelo Tosatti | 60c8aec | 2008-12-01 22:32:02 -0200 | [diff] [blame] | 1618 | #define KVM_PAGE_ARRAY_NR 16 |
| 1619 | |
| 1620 | struct kvm_mmu_pages { |
| 1621 | struct mmu_page_and_offset { |
| 1622 | struct kvm_mmu_page *sp; |
| 1623 | unsigned int idx; |
| 1624 | } page[KVM_PAGE_ARRAY_NR]; |
| 1625 | unsigned int nr; |
| 1626 | }; |
| 1627 | |
Hannes Eder | cded19f | 2009-02-21 02:19:13 +0100 | [diff] [blame] | 1628 | static int mmu_pages_add(struct kvm_mmu_pages *pvec, struct kvm_mmu_page *sp, |
| 1629 | int idx) |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 1630 | { |
Marcelo Tosatti | 60c8aec | 2008-12-01 22:32:02 -0200 | [diff] [blame] | 1631 | int i; |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 1632 | |
Marcelo Tosatti | 60c8aec | 2008-12-01 22:32:02 -0200 | [diff] [blame] | 1633 | if (sp->unsync) |
| 1634 | for (i=0; i < pvec->nr; i++) |
| 1635 | if (pvec->page[i].sp == sp) |
| 1636 | return 0; |
| 1637 | |
| 1638 | pvec->page[pvec->nr].sp = sp; |
| 1639 | pvec->page[pvec->nr].idx = idx; |
| 1640 | pvec->nr++; |
| 1641 | return (pvec->nr == KVM_PAGE_ARRAY_NR); |
| 1642 | } |
| 1643 | |
| 1644 | static int __mmu_unsync_walk(struct kvm_mmu_page *sp, |
| 1645 | struct kvm_mmu_pages *pvec) |
| 1646 | { |
| 1647 | int i, ret, nr_unsync_leaf = 0; |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 1648 | |
Takuya Yoshikawa | 37178b8 | 2011-11-29 14:02:45 +0900 | [diff] [blame] | 1649 | for_each_set_bit(i, sp->unsync_child_bitmap, 512) { |
Xiao Guangrong | 7a8f1a7 | 2010-06-11 21:34:04 +0800 | [diff] [blame] | 1650 | struct kvm_mmu_page *child; |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 1651 | u64 ent = sp->spt[i]; |
| 1652 | |
Xiao Guangrong | 7a8f1a7 | 2010-06-11 21:34:04 +0800 | [diff] [blame] | 1653 | if (!is_shadow_present_pte(ent) || is_large_pte(ent)) |
| 1654 | goto clear_child_bitmap; |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 1655 | |
Xiao Guangrong | 7a8f1a7 | 2010-06-11 21:34:04 +0800 | [diff] [blame] | 1656 | child = page_header(ent & PT64_BASE_ADDR_MASK); |
Marcelo Tosatti | 60c8aec | 2008-12-01 22:32:02 -0200 | [diff] [blame] | 1657 | |
Xiao Guangrong | 7a8f1a7 | 2010-06-11 21:34:04 +0800 | [diff] [blame] | 1658 | if (child->unsync_children) { |
| 1659 | if (mmu_pages_add(pvec, child, i)) |
| 1660 | return -ENOSPC; |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 1661 | |
Xiao Guangrong | 7a8f1a7 | 2010-06-11 21:34:04 +0800 | [diff] [blame] | 1662 | ret = __mmu_unsync_walk(child, pvec); |
| 1663 | if (!ret) |
| 1664 | goto clear_child_bitmap; |
| 1665 | else if (ret > 0) |
| 1666 | nr_unsync_leaf += ret; |
| 1667 | else |
| 1668 | return ret; |
| 1669 | } else if (child->unsync) { |
| 1670 | nr_unsync_leaf++; |
| 1671 | if (mmu_pages_add(pvec, child, i)) |
| 1672 | return -ENOSPC; |
| 1673 | } else |
| 1674 | goto clear_child_bitmap; |
| 1675 | |
| 1676 | continue; |
| 1677 | |
| 1678 | clear_child_bitmap: |
| 1679 | __clear_bit(i, sp->unsync_child_bitmap); |
| 1680 | sp->unsync_children--; |
| 1681 | WARN_ON((int)sp->unsync_children < 0); |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 1682 | } |
| 1683 | |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 1684 | |
Marcelo Tosatti | 60c8aec | 2008-12-01 22:32:02 -0200 | [diff] [blame] | 1685 | return nr_unsync_leaf; |
| 1686 | } |
| 1687 | |
| 1688 | static int mmu_unsync_walk(struct kvm_mmu_page *sp, |
| 1689 | struct kvm_mmu_pages *pvec) |
| 1690 | { |
| 1691 | if (!sp->unsync_children) |
| 1692 | return 0; |
| 1693 | |
| 1694 | mmu_pages_add(pvec, sp, 0); |
| 1695 | return __mmu_unsync_walk(sp, pvec); |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 1696 | } |
| 1697 | |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 1698 | static void kvm_unlink_unsync_page(struct kvm *kvm, struct kvm_mmu_page *sp) |
| 1699 | { |
| 1700 | WARN_ON(!sp->unsync); |
Xiao Guangrong | 5e1b3dd | 2010-04-28 11:55:06 +0800 | [diff] [blame] | 1701 | trace_kvm_mmu_sync_page(sp); |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 1702 | sp->unsync = 0; |
| 1703 | --kvm->stat.mmu_unsync; |
| 1704 | } |
| 1705 | |
Xiao Guangrong | 7775834 | 2010-06-04 21:53:54 +0800 | [diff] [blame] | 1706 | static int kvm_mmu_prepare_zap_page(struct kvm *kvm, struct kvm_mmu_page *sp, |
| 1707 | struct list_head *invalid_list); |
| 1708 | static void kvm_mmu_commit_zap_page(struct kvm *kvm, |
| 1709 | struct list_head *invalid_list); |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 1710 | |
Xiao Guangrong | f34d251 | 2013-05-31 08:36:28 +0800 | [diff] [blame] | 1711 | /* |
| 1712 | * NOTE: we should pay more attention on the zapped-obsolete page |
| 1713 | * (is_obsolete_sp(sp) && sp->role.invalid) when you do hash list walk |
| 1714 | * since it has been deleted from active_mmu_pages but still can be found |
| 1715 | * at hast list. |
| 1716 | * |
| 1717 | * for_each_gfn_indirect_valid_sp has skipped that kind of page and |
| 1718 | * kvm_mmu_get_page(), the only user of for_each_gfn_sp(), has skipped |
| 1719 | * all the obsolete pages. |
| 1720 | */ |
Takuya Yoshikawa | 1044b03 | 2013-03-06 16:05:07 +0900 | [diff] [blame] | 1721 | #define for_each_gfn_sp(_kvm, _sp, _gfn) \ |
| 1722 | hlist_for_each_entry(_sp, \ |
| 1723 | &(_kvm)->arch.mmu_page_hash[kvm_page_table_hashfn(_gfn)], hash_link) \ |
| 1724 | if ((_sp)->gfn != (_gfn)) {} else |
Xiao Guangrong | 7ae680e | 2010-06-04 21:53:07 +0800 | [diff] [blame] | 1725 | |
Takuya Yoshikawa | 1044b03 | 2013-03-06 16:05:07 +0900 | [diff] [blame] | 1726 | #define for_each_gfn_indirect_valid_sp(_kvm, _sp, _gfn) \ |
| 1727 | for_each_gfn_sp(_kvm, _sp, _gfn) \ |
| 1728 | if ((_sp)->role.direct || (_sp)->role.invalid) {} else |
Xiao Guangrong | 7ae680e | 2010-06-04 21:53:07 +0800 | [diff] [blame] | 1729 | |
Xiao Guangrong | f918b44 | 2010-06-11 21:30:36 +0800 | [diff] [blame] | 1730 | /* @sp->gfn should be write-protected at the call site */ |
Xiao Guangrong | 1d9dc7e | 2010-05-15 18:51:24 +0800 | [diff] [blame] | 1731 | static int __kvm_sync_page(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp, |
Xiao Guangrong | d98ba05 | 2010-06-04 21:55:29 +0800 | [diff] [blame] | 1732 | struct list_head *invalid_list, bool clear_unsync) |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 1733 | { |
Avi Kivity | 5b7e010 | 2010-04-14 19:20:03 +0300 | [diff] [blame] | 1734 | if (sp->role.cr4_pae != !!is_pae(vcpu)) { |
Xiao Guangrong | d98ba05 | 2010-06-04 21:55:29 +0800 | [diff] [blame] | 1735 | kvm_mmu_prepare_zap_page(vcpu->kvm, sp, invalid_list); |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 1736 | return 1; |
| 1737 | } |
| 1738 | |
Xiao Guangrong | f918b44 | 2010-06-11 21:30:36 +0800 | [diff] [blame] | 1739 | if (clear_unsync) |
Xiao Guangrong | 1d9dc7e | 2010-05-15 18:51:24 +0800 | [diff] [blame] | 1740 | kvm_unlink_unsync_page(vcpu->kvm, sp); |
Xiao Guangrong | 1d9dc7e | 2010-05-15 18:51:24 +0800 | [diff] [blame] | 1741 | |
Xiao Guangrong | a4a8e6f | 2010-11-19 17:04:03 +0800 | [diff] [blame] | 1742 | if (vcpu->arch.mmu.sync_page(vcpu, sp)) { |
Xiao Guangrong | d98ba05 | 2010-06-04 21:55:29 +0800 | [diff] [blame] | 1743 | kvm_mmu_prepare_zap_page(vcpu->kvm, sp, invalid_list); |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 1744 | return 1; |
| 1745 | } |
| 1746 | |
| 1747 | kvm_mmu_flush_tlb(vcpu); |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 1748 | return 0; |
| 1749 | } |
| 1750 | |
Xiao Guangrong | 1d9dc7e | 2010-05-15 18:51:24 +0800 | [diff] [blame] | 1751 | static int kvm_sync_page_transient(struct kvm_vcpu *vcpu, |
| 1752 | struct kvm_mmu_page *sp) |
| 1753 | { |
Xiao Guangrong | d98ba05 | 2010-06-04 21:55:29 +0800 | [diff] [blame] | 1754 | LIST_HEAD(invalid_list); |
Xiao Guangrong | 1d9dc7e | 2010-05-15 18:51:24 +0800 | [diff] [blame] | 1755 | int ret; |
| 1756 | |
Xiao Guangrong | d98ba05 | 2010-06-04 21:55:29 +0800 | [diff] [blame] | 1757 | ret = __kvm_sync_page(vcpu, sp, &invalid_list, false); |
Xiao Guangrong | be71e06 | 2010-06-11 21:31:38 +0800 | [diff] [blame] | 1758 | if (ret) |
Xiao Guangrong | d98ba05 | 2010-06-04 21:55:29 +0800 | [diff] [blame] | 1759 | kvm_mmu_commit_zap_page(vcpu->kvm, &invalid_list); |
| 1760 | |
Xiao Guangrong | 1d9dc7e | 2010-05-15 18:51:24 +0800 | [diff] [blame] | 1761 | return ret; |
| 1762 | } |
| 1763 | |
Xiao Guangrong | e37fa78 | 2011-11-30 17:43:24 +0800 | [diff] [blame] | 1764 | #ifdef CONFIG_KVM_MMU_AUDIT |
| 1765 | #include "mmu_audit.c" |
| 1766 | #else |
| 1767 | static void kvm_mmu_audit(struct kvm_vcpu *vcpu, int point) { } |
| 1768 | static void mmu_audit_disable(void) { } |
| 1769 | #endif |
| 1770 | |
Xiao Guangrong | d98ba05 | 2010-06-04 21:55:29 +0800 | [diff] [blame] | 1771 | static int kvm_sync_page(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp, |
| 1772 | struct list_head *invalid_list) |
Xiao Guangrong | 1d9dc7e | 2010-05-15 18:51:24 +0800 | [diff] [blame] | 1773 | { |
Xiao Guangrong | d98ba05 | 2010-06-04 21:55:29 +0800 | [diff] [blame] | 1774 | return __kvm_sync_page(vcpu, sp, invalid_list, true); |
Xiao Guangrong | 1d9dc7e | 2010-05-15 18:51:24 +0800 | [diff] [blame] | 1775 | } |
| 1776 | |
Xiao Guangrong | 9f1a122 | 2010-05-24 15:41:33 +0800 | [diff] [blame] | 1777 | /* @gfn should be write-protected at the call site */ |
| 1778 | static void kvm_sync_pages(struct kvm_vcpu *vcpu, gfn_t gfn) |
| 1779 | { |
Xiao Guangrong | 9f1a122 | 2010-05-24 15:41:33 +0800 | [diff] [blame] | 1780 | struct kvm_mmu_page *s; |
Xiao Guangrong | d98ba05 | 2010-06-04 21:55:29 +0800 | [diff] [blame] | 1781 | LIST_HEAD(invalid_list); |
Xiao Guangrong | 9f1a122 | 2010-05-24 15:41:33 +0800 | [diff] [blame] | 1782 | bool flush = false; |
| 1783 | |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 1784 | for_each_gfn_indirect_valid_sp(vcpu->kvm, s, gfn) { |
Xiao Guangrong | 7ae680e | 2010-06-04 21:53:07 +0800 | [diff] [blame] | 1785 | if (!s->unsync) |
Xiao Guangrong | 9f1a122 | 2010-05-24 15:41:33 +0800 | [diff] [blame] | 1786 | continue; |
| 1787 | |
| 1788 | WARN_ON(s->role.level != PT_PAGE_TABLE_LEVEL); |
Xiao Guangrong | a4a8e6f | 2010-11-19 17:04:03 +0800 | [diff] [blame] | 1789 | kvm_unlink_unsync_page(vcpu->kvm, s); |
Xiao Guangrong | 9f1a122 | 2010-05-24 15:41:33 +0800 | [diff] [blame] | 1790 | if ((s->role.cr4_pae != !!is_pae(vcpu)) || |
Xiao Guangrong | a4a8e6f | 2010-11-19 17:04:03 +0800 | [diff] [blame] | 1791 | (vcpu->arch.mmu.sync_page(vcpu, s))) { |
Xiao Guangrong | d98ba05 | 2010-06-04 21:55:29 +0800 | [diff] [blame] | 1792 | kvm_mmu_prepare_zap_page(vcpu->kvm, s, &invalid_list); |
Xiao Guangrong | 9f1a122 | 2010-05-24 15:41:33 +0800 | [diff] [blame] | 1793 | continue; |
| 1794 | } |
Xiao Guangrong | 9f1a122 | 2010-05-24 15:41:33 +0800 | [diff] [blame] | 1795 | flush = true; |
| 1796 | } |
| 1797 | |
Xiao Guangrong | d98ba05 | 2010-06-04 21:55:29 +0800 | [diff] [blame] | 1798 | kvm_mmu_commit_zap_page(vcpu->kvm, &invalid_list); |
Xiao Guangrong | 9f1a122 | 2010-05-24 15:41:33 +0800 | [diff] [blame] | 1799 | if (flush) |
| 1800 | kvm_mmu_flush_tlb(vcpu); |
| 1801 | } |
| 1802 | |
Marcelo Tosatti | 60c8aec | 2008-12-01 22:32:02 -0200 | [diff] [blame] | 1803 | struct mmu_page_path { |
| 1804 | struct kvm_mmu_page *parent[PT64_ROOT_LEVEL-1]; |
| 1805 | unsigned int idx[PT64_ROOT_LEVEL-1]; |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 1806 | }; |
| 1807 | |
Marcelo Tosatti | 60c8aec | 2008-12-01 22:32:02 -0200 | [diff] [blame] | 1808 | #define for_each_sp(pvec, sp, parents, i) \ |
| 1809 | for (i = mmu_pages_next(&pvec, &parents, -1), \ |
| 1810 | sp = pvec.page[i].sp; \ |
| 1811 | i < pvec.nr && ({ sp = pvec.page[i].sp; 1;}); \ |
| 1812 | i = mmu_pages_next(&pvec, &parents, i)) |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 1813 | |
Hannes Eder | cded19f | 2009-02-21 02:19:13 +0100 | [diff] [blame] | 1814 | static int mmu_pages_next(struct kvm_mmu_pages *pvec, |
| 1815 | struct mmu_page_path *parents, |
| 1816 | int i) |
Marcelo Tosatti | 60c8aec | 2008-12-01 22:32:02 -0200 | [diff] [blame] | 1817 | { |
| 1818 | int n; |
| 1819 | |
| 1820 | for (n = i+1; n < pvec->nr; n++) { |
| 1821 | struct kvm_mmu_page *sp = pvec->page[n].sp; |
| 1822 | |
| 1823 | if (sp->role.level == PT_PAGE_TABLE_LEVEL) { |
| 1824 | parents->idx[0] = pvec->page[n].idx; |
| 1825 | return n; |
| 1826 | } |
| 1827 | |
| 1828 | parents->parent[sp->role.level-2] = sp; |
| 1829 | parents->idx[sp->role.level-1] = pvec->page[n].idx; |
| 1830 | } |
| 1831 | |
| 1832 | return n; |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 1833 | } |
| 1834 | |
Hannes Eder | cded19f | 2009-02-21 02:19:13 +0100 | [diff] [blame] | 1835 | static void mmu_pages_clear_parents(struct mmu_page_path *parents) |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 1836 | { |
Marcelo Tosatti | 60c8aec | 2008-12-01 22:32:02 -0200 | [diff] [blame] | 1837 | struct kvm_mmu_page *sp; |
| 1838 | unsigned int level = 0; |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 1839 | |
Marcelo Tosatti | 60c8aec | 2008-12-01 22:32:02 -0200 | [diff] [blame] | 1840 | do { |
| 1841 | unsigned int idx = parents->idx[level]; |
| 1842 | |
| 1843 | sp = parents->parent[level]; |
| 1844 | if (!sp) |
| 1845 | return; |
| 1846 | |
| 1847 | --sp->unsync_children; |
| 1848 | WARN_ON((int)sp->unsync_children < 0); |
| 1849 | __clear_bit(idx, sp->unsync_child_bitmap); |
| 1850 | level++; |
| 1851 | } while (level < PT64_ROOT_LEVEL-1 && !sp->unsync_children); |
| 1852 | } |
| 1853 | |
| 1854 | static void kvm_mmu_pages_init(struct kvm_mmu_page *parent, |
| 1855 | struct mmu_page_path *parents, |
| 1856 | struct kvm_mmu_pages *pvec) |
| 1857 | { |
| 1858 | parents->parent[parent->role.level-1] = NULL; |
| 1859 | pvec->nr = 0; |
| 1860 | } |
| 1861 | |
| 1862 | static void mmu_sync_children(struct kvm_vcpu *vcpu, |
| 1863 | struct kvm_mmu_page *parent) |
| 1864 | { |
| 1865 | int i; |
| 1866 | struct kvm_mmu_page *sp; |
| 1867 | struct mmu_page_path parents; |
| 1868 | struct kvm_mmu_pages pages; |
Xiao Guangrong | d98ba05 | 2010-06-04 21:55:29 +0800 | [diff] [blame] | 1869 | LIST_HEAD(invalid_list); |
Marcelo Tosatti | 60c8aec | 2008-12-01 22:32:02 -0200 | [diff] [blame] | 1870 | |
| 1871 | kvm_mmu_pages_init(parent, &parents, &pages); |
| 1872 | while (mmu_unsync_walk(parent, &pages)) { |
Xiao Guangrong | 2f84569 | 2012-06-20 15:56:53 +0800 | [diff] [blame] | 1873 | bool protected = false; |
Marcelo Tosatti | b1a3682 | 2008-12-01 22:32:03 -0200 | [diff] [blame] | 1874 | |
| 1875 | for_each_sp(pages, sp, parents, i) |
| 1876 | protected |= rmap_write_protect(vcpu->kvm, sp->gfn); |
| 1877 | |
| 1878 | if (protected) |
| 1879 | kvm_flush_remote_tlbs(vcpu->kvm); |
| 1880 | |
Marcelo Tosatti | 60c8aec | 2008-12-01 22:32:02 -0200 | [diff] [blame] | 1881 | for_each_sp(pages, sp, parents, i) { |
Xiao Guangrong | d98ba05 | 2010-06-04 21:55:29 +0800 | [diff] [blame] | 1882 | kvm_sync_page(vcpu, sp, &invalid_list); |
Marcelo Tosatti | 60c8aec | 2008-12-01 22:32:02 -0200 | [diff] [blame] | 1883 | mmu_pages_clear_parents(&parents); |
| 1884 | } |
Xiao Guangrong | d98ba05 | 2010-06-04 21:55:29 +0800 | [diff] [blame] | 1885 | kvm_mmu_commit_zap_page(vcpu->kvm, &invalid_list); |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 1886 | cond_resched_lock(&vcpu->kvm->mmu_lock); |
Marcelo Tosatti | 60c8aec | 2008-12-01 22:32:02 -0200 | [diff] [blame] | 1887 | kvm_mmu_pages_init(parent, &parents, &pages); |
| 1888 | } |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 1889 | } |
| 1890 | |
Xiao Guangrong | c370795 | 2011-07-12 03:28:04 +0800 | [diff] [blame] | 1891 | static void init_shadow_page_table(struct kvm_mmu_page *sp) |
| 1892 | { |
| 1893 | int i; |
| 1894 | |
| 1895 | for (i = 0; i < PT64_ENT_PER_PAGE; ++i) |
| 1896 | sp->spt[i] = 0ull; |
| 1897 | } |
| 1898 | |
Xiao Guangrong | a30f47c | 2011-09-22 16:58:36 +0800 | [diff] [blame] | 1899 | static void __clear_sp_write_flooding_count(struct kvm_mmu_page *sp) |
| 1900 | { |
| 1901 | sp->write_flooding_count = 0; |
| 1902 | } |
| 1903 | |
| 1904 | static void clear_sp_write_flooding_count(u64 *spte) |
| 1905 | { |
| 1906 | struct kvm_mmu_page *sp = page_header(__pa(spte)); |
| 1907 | |
| 1908 | __clear_sp_write_flooding_count(sp); |
| 1909 | } |
| 1910 | |
Xiao Guangrong | 5304b8d | 2013-05-31 08:36:22 +0800 | [diff] [blame] | 1911 | static bool is_obsolete_sp(struct kvm *kvm, struct kvm_mmu_page *sp) |
| 1912 | { |
| 1913 | return unlikely(sp->mmu_valid_gen != kvm->arch.mmu_valid_gen); |
| 1914 | } |
| 1915 | |
Avi Kivity | cea0f0e | 2007-01-05 16:36:43 -0800 | [diff] [blame] | 1916 | static struct kvm_mmu_page *kvm_mmu_get_page(struct kvm_vcpu *vcpu, |
| 1917 | gfn_t gfn, |
| 1918 | gva_t gaddr, |
| 1919 | unsigned level, |
Avi Kivity | f6e2c02 | 2009-01-11 13:02:10 +0200 | [diff] [blame] | 1920 | int direct, |
Avi Kivity | 41074d0 | 2007-12-09 17:00:02 +0200 | [diff] [blame] | 1921 | unsigned access, |
Avi Kivity | f7d9c7b | 2008-02-26 22:12:10 +0200 | [diff] [blame] | 1922 | u64 *parent_pte) |
Avi Kivity | cea0f0e | 2007-01-05 16:36:43 -0800 | [diff] [blame] | 1923 | { |
| 1924 | union kvm_mmu_page_role role; |
Avi Kivity | cea0f0e | 2007-01-05 16:36:43 -0800 | [diff] [blame] | 1925 | unsigned quadrant; |
Xiao Guangrong | 9f1a122 | 2010-05-24 15:41:33 +0800 | [diff] [blame] | 1926 | struct kvm_mmu_page *sp; |
Xiao Guangrong | 9f1a122 | 2010-05-24 15:41:33 +0800 | [diff] [blame] | 1927 | bool need_sync = false; |
Avi Kivity | cea0f0e | 2007-01-05 16:36:43 -0800 | [diff] [blame] | 1928 | |
Avi Kivity | a770f6f | 2008-12-21 19:20:09 +0200 | [diff] [blame] | 1929 | role = vcpu->arch.mmu.base_role; |
Avi Kivity | cea0f0e | 2007-01-05 16:36:43 -0800 | [diff] [blame] | 1930 | role.level = level; |
Avi Kivity | f6e2c02 | 2009-01-11 13:02:10 +0200 | [diff] [blame] | 1931 | role.direct = direct; |
Avi Kivity | 84b0c8c | 2010-03-14 10:16:40 +0200 | [diff] [blame] | 1932 | if (role.direct) |
Avi Kivity | 5b7e010 | 2010-04-14 19:20:03 +0300 | [diff] [blame] | 1933 | role.cr4_pae = 0; |
Avi Kivity | 41074d0 | 2007-12-09 17:00:02 +0200 | [diff] [blame] | 1934 | role.access = access; |
Joerg Roedel | c5a78f2b | 2010-09-10 17:30:39 +0200 | [diff] [blame] | 1935 | if (!vcpu->arch.mmu.direct_map |
| 1936 | && vcpu->arch.mmu.root_level <= PT32_ROOT_LEVEL) { |
Avi Kivity | cea0f0e | 2007-01-05 16:36:43 -0800 | [diff] [blame] | 1937 | quadrant = gaddr >> (PAGE_SHIFT + (PT64_PT_BITS * level)); |
| 1938 | quadrant &= (1 << ((PT32_PT_BITS - PT64_PT_BITS) * level)) - 1; |
| 1939 | role.quadrant = quadrant; |
| 1940 | } |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 1941 | for_each_gfn_sp(vcpu->kvm, sp, gfn) { |
Xiao Guangrong | 7f52af7 | 2013-05-31 08:36:26 +0800 | [diff] [blame] | 1942 | if (is_obsolete_sp(vcpu->kvm, sp)) |
| 1943 | continue; |
| 1944 | |
Xiao Guangrong | 7ae680e | 2010-06-04 21:53:07 +0800 | [diff] [blame] | 1945 | if (!need_sync && sp->unsync) |
| 1946 | need_sync = true; |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 1947 | |
Xiao Guangrong | 7ae680e | 2010-06-04 21:53:07 +0800 | [diff] [blame] | 1948 | if (sp->role.word != role.word) |
| 1949 | continue; |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 1950 | |
Xiao Guangrong | 7ae680e | 2010-06-04 21:53:07 +0800 | [diff] [blame] | 1951 | if (sp->unsync && kvm_sync_page_transient(vcpu, sp)) |
| 1952 | break; |
Xiao Guangrong | e02aa90 | 2010-05-15 18:52:34 +0800 | [diff] [blame] | 1953 | |
Xiao Guangrong | 7ae680e | 2010-06-04 21:53:07 +0800 | [diff] [blame] | 1954 | mmu_page_add_parent_pte(vcpu, sp, parent_pte); |
| 1955 | if (sp->unsync_children) { |
Avi Kivity | a8eeb04 | 2010-05-10 12:34:53 +0300 | [diff] [blame] | 1956 | kvm_make_request(KVM_REQ_MMU_SYNC, vcpu); |
Xiao Guangrong | 7ae680e | 2010-06-04 21:53:07 +0800 | [diff] [blame] | 1957 | kvm_mmu_mark_parents_unsync(sp); |
| 1958 | } else if (sp->unsync) |
| 1959 | kvm_mmu_mark_parents_unsync(sp); |
Xiao Guangrong | e02aa90 | 2010-05-15 18:52:34 +0800 | [diff] [blame] | 1960 | |
Xiao Guangrong | a30f47c | 2011-09-22 16:58:36 +0800 | [diff] [blame] | 1961 | __clear_sp_write_flooding_count(sp); |
Xiao Guangrong | 7ae680e | 2010-06-04 21:53:07 +0800 | [diff] [blame] | 1962 | trace_kvm_mmu_get_page(sp, false); |
| 1963 | return sp; |
| 1964 | } |
Avi Kivity | dfc5aa0 | 2007-12-18 19:47:18 +0200 | [diff] [blame] | 1965 | ++vcpu->kvm->stat.mmu_cache_miss; |
Lai Jiangshan | 2032a93 | 2010-05-26 16:49:59 +0800 | [diff] [blame] | 1966 | sp = kvm_mmu_alloc_page(vcpu, parent_pte, direct); |
Avi Kivity | 4db3531 | 2007-11-21 15:28:32 +0200 | [diff] [blame] | 1967 | if (!sp) |
| 1968 | return sp; |
Avi Kivity | 4db3531 | 2007-11-21 15:28:32 +0200 | [diff] [blame] | 1969 | sp->gfn = gfn; |
| 1970 | sp->role = role; |
Xiao Guangrong | 7ae680e | 2010-06-04 21:53:07 +0800 | [diff] [blame] | 1971 | hlist_add_head(&sp->hash_link, |
| 1972 | &vcpu->kvm->arch.mmu_page_hash[kvm_page_table_hashfn(gfn)]); |
Avi Kivity | f6e2c02 | 2009-01-11 13:02:10 +0200 | [diff] [blame] | 1973 | if (!direct) { |
Marcelo Tosatti | b1a3682 | 2008-12-01 22:32:03 -0200 | [diff] [blame] | 1974 | if (rmap_write_protect(vcpu->kvm, gfn)) |
| 1975 | kvm_flush_remote_tlbs(vcpu->kvm); |
Xiao Guangrong | 9f1a122 | 2010-05-24 15:41:33 +0800 | [diff] [blame] | 1976 | if (level > PT_PAGE_TABLE_LEVEL && need_sync) |
| 1977 | kvm_sync_pages(vcpu, gfn); |
| 1978 | |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 1979 | account_shadowed(vcpu->kvm, gfn); |
| 1980 | } |
Xiao Guangrong | 5304b8d | 2013-05-31 08:36:22 +0800 | [diff] [blame] | 1981 | sp->mmu_valid_gen = vcpu->kvm->arch.mmu_valid_gen; |
Xiao Guangrong | c370795 | 2011-07-12 03:28:04 +0800 | [diff] [blame] | 1982 | init_shadow_page_table(sp); |
Avi Kivity | f691fe1 | 2009-07-06 15:58:14 +0300 | [diff] [blame] | 1983 | trace_kvm_mmu_get_page(sp, true); |
Avi Kivity | 4db3531 | 2007-11-21 15:28:32 +0200 | [diff] [blame] | 1984 | return sp; |
Avi Kivity | cea0f0e | 2007-01-05 16:36:43 -0800 | [diff] [blame] | 1985 | } |
| 1986 | |
Avi Kivity | 2d11123 | 2008-12-25 14:39:47 +0200 | [diff] [blame] | 1987 | static void shadow_walk_init(struct kvm_shadow_walk_iterator *iterator, |
| 1988 | struct kvm_vcpu *vcpu, u64 addr) |
| 1989 | { |
| 1990 | iterator->addr = addr; |
| 1991 | iterator->shadow_addr = vcpu->arch.mmu.root_hpa; |
| 1992 | iterator->level = vcpu->arch.mmu.shadow_root_level; |
Joerg Roedel | 81407ca | 2010-09-10 17:31:00 +0200 | [diff] [blame] | 1993 | |
| 1994 | if (iterator->level == PT64_ROOT_LEVEL && |
| 1995 | vcpu->arch.mmu.root_level < PT64_ROOT_LEVEL && |
| 1996 | !vcpu->arch.mmu.direct_map) |
| 1997 | --iterator->level; |
| 1998 | |
Avi Kivity | 2d11123 | 2008-12-25 14:39:47 +0200 | [diff] [blame] | 1999 | if (iterator->level == PT32E_ROOT_LEVEL) { |
| 2000 | iterator->shadow_addr |
| 2001 | = vcpu->arch.mmu.pae_root[(addr >> 30) & 3]; |
| 2002 | iterator->shadow_addr &= PT64_BASE_ADDR_MASK; |
| 2003 | --iterator->level; |
| 2004 | if (!iterator->shadow_addr) |
| 2005 | iterator->level = 0; |
| 2006 | } |
| 2007 | } |
| 2008 | |
| 2009 | static bool shadow_walk_okay(struct kvm_shadow_walk_iterator *iterator) |
| 2010 | { |
| 2011 | if (iterator->level < PT_PAGE_TABLE_LEVEL) |
| 2012 | return false; |
Marcelo Tosatti | 4d88954 | 2009-06-11 12:07:41 -0300 | [diff] [blame] | 2013 | |
Avi Kivity | 2d11123 | 2008-12-25 14:39:47 +0200 | [diff] [blame] | 2014 | iterator->index = SHADOW_PT_INDEX(iterator->addr, iterator->level); |
| 2015 | iterator->sptep = ((u64 *)__va(iterator->shadow_addr)) + iterator->index; |
| 2016 | return true; |
| 2017 | } |
| 2018 | |
Xiao Guangrong | c2a2ac2 | 2011-07-12 03:32:13 +0800 | [diff] [blame] | 2019 | static void __shadow_walk_next(struct kvm_shadow_walk_iterator *iterator, |
| 2020 | u64 spte) |
Avi Kivity | 2d11123 | 2008-12-25 14:39:47 +0200 | [diff] [blame] | 2021 | { |
Xiao Guangrong | c2a2ac2 | 2011-07-12 03:32:13 +0800 | [diff] [blame] | 2022 | if (is_last_spte(spte, iterator->level)) { |
Xiao Guangrong | 052331b | 2011-07-12 03:21:17 +0800 | [diff] [blame] | 2023 | iterator->level = 0; |
| 2024 | return; |
| 2025 | } |
| 2026 | |
Xiao Guangrong | c2a2ac2 | 2011-07-12 03:32:13 +0800 | [diff] [blame] | 2027 | iterator->shadow_addr = spte & PT64_BASE_ADDR_MASK; |
Avi Kivity | 2d11123 | 2008-12-25 14:39:47 +0200 | [diff] [blame] | 2028 | --iterator->level; |
| 2029 | } |
| 2030 | |
Xiao Guangrong | c2a2ac2 | 2011-07-12 03:32:13 +0800 | [diff] [blame] | 2031 | static void shadow_walk_next(struct kvm_shadow_walk_iterator *iterator) |
| 2032 | { |
| 2033 | return __shadow_walk_next(iterator, *iterator->sptep); |
| 2034 | } |
| 2035 | |
Yang Zhang | 7a1638c | 2013-08-05 11:07:13 +0300 | [diff] [blame] | 2036 | static void link_shadow_page(u64 *sptep, struct kvm_mmu_page *sp, bool accessed) |
Avi Kivity | 32ef26a | 2010-07-13 14:27:04 +0300 | [diff] [blame] | 2037 | { |
| 2038 | u64 spte; |
| 2039 | |
Yang Zhang | 7a1638c | 2013-08-05 11:07:13 +0300 | [diff] [blame] | 2040 | BUILD_BUG_ON(VMX_EPT_READABLE_MASK != PT_PRESENT_MASK || |
| 2041 | VMX_EPT_WRITABLE_MASK != PT_WRITABLE_MASK); |
| 2042 | |
Xiao Guangrong | 24db273 | 2013-02-05 15:28:02 +0800 | [diff] [blame] | 2043 | spte = __pa(sp->spt) | PT_PRESENT_MASK | PT_WRITABLE_MASK | |
Yang Zhang | 7a1638c | 2013-08-05 11:07:13 +0300 | [diff] [blame] | 2044 | shadow_user_mask | shadow_x_mask; |
| 2045 | |
| 2046 | if (accessed) |
| 2047 | spte |= shadow_accessed_mask; |
Xiao Guangrong | 24db273 | 2013-02-05 15:28:02 +0800 | [diff] [blame] | 2048 | |
Xiao Guangrong | 1df9f2d | 2011-07-12 03:30:35 +0800 | [diff] [blame] | 2049 | mmu_spte_set(sptep, spte); |
Avi Kivity | 32ef26a | 2010-07-13 14:27:04 +0300 | [diff] [blame] | 2050 | } |
| 2051 | |
Avi Kivity | a357bd2 | 2010-07-13 14:27:07 +0300 | [diff] [blame] | 2052 | static void validate_direct_spte(struct kvm_vcpu *vcpu, u64 *sptep, |
| 2053 | unsigned direct_access) |
| 2054 | { |
| 2055 | if (is_shadow_present_pte(*sptep) && !is_large_pte(*sptep)) { |
| 2056 | struct kvm_mmu_page *child; |
| 2057 | |
| 2058 | /* |
| 2059 | * For the direct sp, if the guest pte's dirty bit |
| 2060 | * changed form clean to dirty, it will corrupt the |
| 2061 | * sp's access: allow writable in the read-only sp, |
| 2062 | * so we should update the spte at this point to get |
| 2063 | * a new sp with the correct access. |
| 2064 | */ |
| 2065 | child = page_header(*sptep & PT64_BASE_ADDR_MASK); |
| 2066 | if (child->role.access == direct_access) |
| 2067 | return; |
| 2068 | |
Xiao Guangrong | bcdd9a9 | 2011-05-15 23:28:29 +0800 | [diff] [blame] | 2069 | drop_parent_pte(child, sptep); |
Avi Kivity | a357bd2 | 2010-07-13 14:27:07 +0300 | [diff] [blame] | 2070 | kvm_flush_remote_tlbs(vcpu->kvm); |
| 2071 | } |
| 2072 | } |
| 2073 | |
Xiao Guangrong | 505aef8 | 2011-09-22 16:56:06 +0800 | [diff] [blame] | 2074 | static bool mmu_page_zap_pte(struct kvm *kvm, struct kvm_mmu_page *sp, |
Xiao Guangrong | 38e3b2b | 2011-05-15 23:27:52 +0800 | [diff] [blame] | 2075 | u64 *spte) |
| 2076 | { |
| 2077 | u64 pte; |
| 2078 | struct kvm_mmu_page *child; |
| 2079 | |
| 2080 | pte = *spte; |
| 2081 | if (is_shadow_present_pte(pte)) { |
Xiao Guangrong | 505aef8 | 2011-09-22 16:56:06 +0800 | [diff] [blame] | 2082 | if (is_last_spte(pte, sp->role.level)) { |
Xiao Guangrong | c370795 | 2011-07-12 03:28:04 +0800 | [diff] [blame] | 2083 | drop_spte(kvm, spte); |
Xiao Guangrong | 505aef8 | 2011-09-22 16:56:06 +0800 | [diff] [blame] | 2084 | if (is_large_pte(pte)) |
| 2085 | --kvm->stat.lpages; |
| 2086 | } else { |
Xiao Guangrong | 38e3b2b | 2011-05-15 23:27:52 +0800 | [diff] [blame] | 2087 | child = page_header(pte & PT64_BASE_ADDR_MASK); |
Xiao Guangrong | bcdd9a9 | 2011-05-15 23:28:29 +0800 | [diff] [blame] | 2088 | drop_parent_pte(child, spte); |
Xiao Guangrong | 38e3b2b | 2011-05-15 23:27:52 +0800 | [diff] [blame] | 2089 | } |
Xiao Guangrong | 505aef8 | 2011-09-22 16:56:06 +0800 | [diff] [blame] | 2090 | return true; |
| 2091 | } |
| 2092 | |
| 2093 | if (is_mmio_spte(pte)) |
Xiao Guangrong | ce88dec | 2011-07-12 03:33:44 +0800 | [diff] [blame] | 2094 | mmu_spte_clear_no_track(spte); |
Xiao Guangrong | c370795 | 2011-07-12 03:28:04 +0800 | [diff] [blame] | 2095 | |
Xiao Guangrong | 505aef8 | 2011-09-22 16:56:06 +0800 | [diff] [blame] | 2096 | return false; |
Xiao Guangrong | 38e3b2b | 2011-05-15 23:27:52 +0800 | [diff] [blame] | 2097 | } |
| 2098 | |
Avi Kivity | 90cb052 | 2007-07-17 13:04:56 +0300 | [diff] [blame] | 2099 | static void kvm_mmu_page_unlink_children(struct kvm *kvm, |
Avi Kivity | 4db3531 | 2007-11-21 15:28:32 +0200 | [diff] [blame] | 2100 | struct kvm_mmu_page *sp) |
Avi Kivity | a436036 | 2007-01-05 16:36:45 -0800 | [diff] [blame] | 2101 | { |
Avi Kivity | 697fe2e | 2007-01-05 16:36:46 -0800 | [diff] [blame] | 2102 | unsigned i; |
Avi Kivity | 697fe2e | 2007-01-05 16:36:46 -0800 | [diff] [blame] | 2103 | |
Xiao Guangrong | 38e3b2b | 2011-05-15 23:27:52 +0800 | [diff] [blame] | 2104 | for (i = 0; i < PT64_ENT_PER_PAGE; ++i) |
| 2105 | mmu_page_zap_pte(kvm, sp, sp->spt + i); |
Avi Kivity | a436036 | 2007-01-05 16:36:45 -0800 | [diff] [blame] | 2106 | } |
| 2107 | |
Avi Kivity | 4db3531 | 2007-11-21 15:28:32 +0200 | [diff] [blame] | 2108 | static void kvm_mmu_put_page(struct kvm_mmu_page *sp, u64 *parent_pte) |
Avi Kivity | cea0f0e | 2007-01-05 16:36:43 -0800 | [diff] [blame] | 2109 | { |
Avi Kivity | 4db3531 | 2007-11-21 15:28:32 +0200 | [diff] [blame] | 2110 | mmu_page_remove_parent_pte(sp, parent_pte); |
Avi Kivity | a436036 | 2007-01-05 16:36:45 -0800 | [diff] [blame] | 2111 | } |
| 2112 | |
Avi Kivity | 31aa2b4 | 2008-07-11 17:59:46 +0300 | [diff] [blame] | 2113 | static void kvm_mmu_unlink_parents(struct kvm *kvm, struct kvm_mmu_page *sp) |
Avi Kivity | a436036 | 2007-01-05 16:36:45 -0800 | [diff] [blame] | 2114 | { |
Takuya Yoshikawa | 1e3f42f | 2012-03-21 23:50:34 +0900 | [diff] [blame] | 2115 | u64 *sptep; |
| 2116 | struct rmap_iterator iter; |
Avi Kivity | a436036 | 2007-01-05 16:36:45 -0800 | [diff] [blame] | 2117 | |
Takuya Yoshikawa | 1e3f42f | 2012-03-21 23:50:34 +0900 | [diff] [blame] | 2118 | while ((sptep = rmap_get_first(sp->parent_ptes, &iter))) |
| 2119 | drop_parent_pte(sp, sptep); |
Avi Kivity | 31aa2b4 | 2008-07-11 17:59:46 +0300 | [diff] [blame] | 2120 | } |
| 2121 | |
Marcelo Tosatti | 60c8aec | 2008-12-01 22:32:02 -0200 | [diff] [blame] | 2122 | static int mmu_zap_unsync_children(struct kvm *kvm, |
Xiao Guangrong | 7775834 | 2010-06-04 21:53:54 +0800 | [diff] [blame] | 2123 | struct kvm_mmu_page *parent, |
| 2124 | struct list_head *invalid_list) |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 2125 | { |
Marcelo Tosatti | 60c8aec | 2008-12-01 22:32:02 -0200 | [diff] [blame] | 2126 | int i, zapped = 0; |
| 2127 | struct mmu_page_path parents; |
| 2128 | struct kvm_mmu_pages pages; |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 2129 | |
Marcelo Tosatti | 60c8aec | 2008-12-01 22:32:02 -0200 | [diff] [blame] | 2130 | if (parent->role.level == PT_PAGE_TABLE_LEVEL) |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 2131 | return 0; |
Marcelo Tosatti | 60c8aec | 2008-12-01 22:32:02 -0200 | [diff] [blame] | 2132 | |
| 2133 | kvm_mmu_pages_init(parent, &parents, &pages); |
| 2134 | while (mmu_unsync_walk(parent, &pages)) { |
| 2135 | struct kvm_mmu_page *sp; |
| 2136 | |
| 2137 | for_each_sp(pages, sp, parents, i) { |
Xiao Guangrong | 7775834 | 2010-06-04 21:53:54 +0800 | [diff] [blame] | 2138 | kvm_mmu_prepare_zap_page(kvm, sp, invalid_list); |
Marcelo Tosatti | 60c8aec | 2008-12-01 22:32:02 -0200 | [diff] [blame] | 2139 | mmu_pages_clear_parents(&parents); |
Xiao Guangrong | 77662e0 | 2010-04-16 16:34:42 +0800 | [diff] [blame] | 2140 | zapped++; |
Marcelo Tosatti | 60c8aec | 2008-12-01 22:32:02 -0200 | [diff] [blame] | 2141 | } |
Marcelo Tosatti | 60c8aec | 2008-12-01 22:32:02 -0200 | [diff] [blame] | 2142 | kvm_mmu_pages_init(parent, &parents, &pages); |
| 2143 | } |
| 2144 | |
| 2145 | return zapped; |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 2146 | } |
| 2147 | |
Xiao Guangrong | 7775834 | 2010-06-04 21:53:54 +0800 | [diff] [blame] | 2148 | static int kvm_mmu_prepare_zap_page(struct kvm *kvm, struct kvm_mmu_page *sp, |
| 2149 | struct list_head *invalid_list) |
Avi Kivity | 31aa2b4 | 2008-07-11 17:59:46 +0300 | [diff] [blame] | 2150 | { |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 2151 | int ret; |
Avi Kivity | f691fe1 | 2009-07-06 15:58:14 +0300 | [diff] [blame] | 2152 | |
Xiao Guangrong | 7775834 | 2010-06-04 21:53:54 +0800 | [diff] [blame] | 2153 | trace_kvm_mmu_prepare_zap_page(sp); |
Avi Kivity | 31aa2b4 | 2008-07-11 17:59:46 +0300 | [diff] [blame] | 2154 | ++kvm->stat.mmu_shadow_zapped; |
Xiao Guangrong | 7775834 | 2010-06-04 21:53:54 +0800 | [diff] [blame] | 2155 | ret = mmu_zap_unsync_children(kvm, sp, invalid_list); |
Avi Kivity | 4db3531 | 2007-11-21 15:28:32 +0200 | [diff] [blame] | 2156 | kvm_mmu_page_unlink_children(kvm, sp); |
Avi Kivity | 31aa2b4 | 2008-07-11 17:59:46 +0300 | [diff] [blame] | 2157 | kvm_mmu_unlink_parents(kvm, sp); |
Xiao Guangrong | 5304b8d | 2013-05-31 08:36:22 +0800 | [diff] [blame] | 2158 | |
Avi Kivity | f6e2c02 | 2009-01-11 13:02:10 +0200 | [diff] [blame] | 2159 | if (!sp->role.invalid && !sp->role.direct) |
Avi Kivity | 5b5c6a5 | 2008-07-11 18:07:26 +0300 | [diff] [blame] | 2160 | unaccount_shadowed(kvm, sp->gfn); |
Xiao Guangrong | 5304b8d | 2013-05-31 08:36:22 +0800 | [diff] [blame] | 2161 | |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 2162 | if (sp->unsync) |
| 2163 | kvm_unlink_unsync_page(kvm, sp); |
Avi Kivity | 4db3531 | 2007-11-21 15:28:32 +0200 | [diff] [blame] | 2164 | if (!sp->root_count) { |
Gui Jianfeng | 54a4f02 | 2010-05-05 09:03:49 +0800 | [diff] [blame] | 2165 | /* Count self */ |
| 2166 | ret++; |
Xiao Guangrong | 7775834 | 2010-06-04 21:53:54 +0800 | [diff] [blame] | 2167 | list_move(&sp->link, invalid_list); |
Xiao Guangrong | aa6bd18 | 2011-07-12 03:26:40 +0800 | [diff] [blame] | 2168 | kvm_mod_used_mmu_pages(kvm, -1); |
Marcelo Tosatti | 2e53d63 | 2008-02-20 14:47:24 -0500 | [diff] [blame] | 2169 | } else { |
Avi Kivity | 5b5c6a5 | 2008-07-11 18:07:26 +0300 | [diff] [blame] | 2170 | list_move(&sp->link, &kvm->arch.active_mmu_pages); |
Gleb Natapov | 05988d7 | 2013-05-31 08:36:30 +0800 | [diff] [blame] | 2171 | |
| 2172 | /* |
| 2173 | * The obsolete pages can not be used on any vcpus. |
| 2174 | * See the comments in kvm_mmu_invalidate_zap_all_pages(). |
| 2175 | */ |
| 2176 | if (!sp->role.invalid && !is_obsolete_sp(kvm, sp)) |
| 2177 | kvm_reload_remote_mmus(kvm); |
Marcelo Tosatti | 2e53d63 | 2008-02-20 14:47:24 -0500 | [diff] [blame] | 2178 | } |
Xiao Guangrong | 7775834 | 2010-06-04 21:53:54 +0800 | [diff] [blame] | 2179 | |
| 2180 | sp->role.invalid = 1; |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 2181 | return ret; |
Avi Kivity | a436036 | 2007-01-05 16:36:45 -0800 | [diff] [blame] | 2182 | } |
| 2183 | |
Xiao Guangrong | 7775834 | 2010-06-04 21:53:54 +0800 | [diff] [blame] | 2184 | static void kvm_mmu_commit_zap_page(struct kvm *kvm, |
| 2185 | struct list_head *invalid_list) |
| 2186 | { |
Takuya Yoshikawa | 945315b | 2013-03-06 16:05:52 +0900 | [diff] [blame] | 2187 | struct kvm_mmu_page *sp, *nsp; |
Xiao Guangrong | 7775834 | 2010-06-04 21:53:54 +0800 | [diff] [blame] | 2188 | |
| 2189 | if (list_empty(invalid_list)) |
| 2190 | return; |
| 2191 | |
Avi Kivity | c142786 | 2012-05-14 15:44:06 +0300 | [diff] [blame] | 2192 | /* |
| 2193 | * wmb: make sure everyone sees our modifications to the page tables |
| 2194 | * rmb: make sure we see changes to vcpu->mode |
| 2195 | */ |
| 2196 | smp_mb(); |
| 2197 | |
| 2198 | /* |
| 2199 | * Wait for all vcpus to exit guest mode and/or lockless shadow |
| 2200 | * page table walks. |
| 2201 | */ |
Xiao Guangrong | 7775834 | 2010-06-04 21:53:54 +0800 | [diff] [blame] | 2202 | kvm_flush_remote_tlbs(kvm); |
| 2203 | |
Takuya Yoshikawa | 945315b | 2013-03-06 16:05:52 +0900 | [diff] [blame] | 2204 | list_for_each_entry_safe(sp, nsp, invalid_list, link) { |
Xiao Guangrong | 7775834 | 2010-06-04 21:53:54 +0800 | [diff] [blame] | 2205 | WARN_ON(!sp->role.invalid || sp->root_count); |
Xiao Guangrong | aa6bd18 | 2011-07-12 03:26:40 +0800 | [diff] [blame] | 2206 | kvm_mmu_free_page(sp); |
Takuya Yoshikawa | 945315b | 2013-03-06 16:05:52 +0900 | [diff] [blame] | 2207 | } |
Xiao Guangrong | 7775834 | 2010-06-04 21:53:54 +0800 | [diff] [blame] | 2208 | } |
| 2209 | |
Takuya Yoshikawa | 5da5960 | 2013-03-06 16:06:58 +0900 | [diff] [blame] | 2210 | static bool prepare_zap_oldest_mmu_page(struct kvm *kvm, |
| 2211 | struct list_head *invalid_list) |
| 2212 | { |
| 2213 | struct kvm_mmu_page *sp; |
| 2214 | |
| 2215 | if (list_empty(&kvm->arch.active_mmu_pages)) |
| 2216 | return false; |
| 2217 | |
| 2218 | sp = list_entry(kvm->arch.active_mmu_pages.prev, |
| 2219 | struct kvm_mmu_page, link); |
| 2220 | kvm_mmu_prepare_zap_page(kvm, sp, invalid_list); |
| 2221 | |
| 2222 | return true; |
| 2223 | } |
| 2224 | |
Izik Eidus | 82ce2c9 | 2007-10-02 18:52:55 +0200 | [diff] [blame] | 2225 | /* |
| 2226 | * Changing the number of mmu pages allocated to the vm |
Dave Hansen | 49d5ca2 | 2010-08-19 18:11:28 -0700 | [diff] [blame] | 2227 | * Note: if goal_nr_mmu_pages is too small, you will get dead lock |
Izik Eidus | 82ce2c9 | 2007-10-02 18:52:55 +0200 | [diff] [blame] | 2228 | */ |
Dave Hansen | 49d5ca2 | 2010-08-19 18:11:28 -0700 | [diff] [blame] | 2229 | void kvm_mmu_change_mmu_pages(struct kvm *kvm, unsigned int goal_nr_mmu_pages) |
Izik Eidus | 82ce2c9 | 2007-10-02 18:52:55 +0200 | [diff] [blame] | 2230 | { |
Xiao Guangrong | d98ba05 | 2010-06-04 21:55:29 +0800 | [diff] [blame] | 2231 | LIST_HEAD(invalid_list); |
Izik Eidus | 82ce2c9 | 2007-10-02 18:52:55 +0200 | [diff] [blame] | 2232 | |
Takuya Yoshikawa | b34cb59 | 2013-01-08 19:46:07 +0900 | [diff] [blame] | 2233 | spin_lock(&kvm->mmu_lock); |
| 2234 | |
Dave Hansen | 49d5ca2 | 2010-08-19 18:11:28 -0700 | [diff] [blame] | 2235 | if (kvm->arch.n_used_mmu_pages > goal_nr_mmu_pages) { |
Takuya Yoshikawa | 5da5960 | 2013-03-06 16:06:58 +0900 | [diff] [blame] | 2236 | /* Need to free some mmu pages to achieve the goal. */ |
| 2237 | while (kvm->arch.n_used_mmu_pages > goal_nr_mmu_pages) |
| 2238 | if (!prepare_zap_oldest_mmu_page(kvm, &invalid_list)) |
| 2239 | break; |
Izik Eidus | 82ce2c9 | 2007-10-02 18:52:55 +0200 | [diff] [blame] | 2240 | |
Xiao Guangrong | aa6bd18 | 2011-07-12 03:26:40 +0800 | [diff] [blame] | 2241 | kvm_mmu_commit_zap_page(kvm, &invalid_list); |
Dave Hansen | 49d5ca2 | 2010-08-19 18:11:28 -0700 | [diff] [blame] | 2242 | goal_nr_mmu_pages = kvm->arch.n_used_mmu_pages; |
Izik Eidus | 82ce2c9 | 2007-10-02 18:52:55 +0200 | [diff] [blame] | 2243 | } |
Izik Eidus | 82ce2c9 | 2007-10-02 18:52:55 +0200 | [diff] [blame] | 2244 | |
Dave Hansen | 49d5ca2 | 2010-08-19 18:11:28 -0700 | [diff] [blame] | 2245 | kvm->arch.n_max_mmu_pages = goal_nr_mmu_pages; |
Takuya Yoshikawa | b34cb59 | 2013-01-08 19:46:07 +0900 | [diff] [blame] | 2246 | |
| 2247 | spin_unlock(&kvm->mmu_lock); |
Izik Eidus | 82ce2c9 | 2007-10-02 18:52:55 +0200 | [diff] [blame] | 2248 | } |
| 2249 | |
Xiao Guangrong | 1cb3f3a | 2011-09-22 17:02:48 +0800 | [diff] [blame] | 2250 | int kvm_mmu_unprotect_page(struct kvm *kvm, gfn_t gfn) |
Avi Kivity | a436036 | 2007-01-05 16:36:45 -0800 | [diff] [blame] | 2251 | { |
Avi Kivity | 4db3531 | 2007-11-21 15:28:32 +0200 | [diff] [blame] | 2252 | struct kvm_mmu_page *sp; |
Xiao Guangrong | d98ba05 | 2010-06-04 21:55:29 +0800 | [diff] [blame] | 2253 | LIST_HEAD(invalid_list); |
Avi Kivity | a436036 | 2007-01-05 16:36:45 -0800 | [diff] [blame] | 2254 | int r; |
| 2255 | |
Xiao Guangrong | 9ad17b10 | 2010-08-28 19:19:42 +0800 | [diff] [blame] | 2256 | pgprintk("%s: looking for gfn %llx\n", __func__, gfn); |
Avi Kivity | a436036 | 2007-01-05 16:36:45 -0800 | [diff] [blame] | 2257 | r = 0; |
Xiao Guangrong | 1cb3f3a | 2011-09-22 17:02:48 +0800 | [diff] [blame] | 2258 | spin_lock(&kvm->mmu_lock); |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 2259 | for_each_gfn_indirect_valid_sp(kvm, sp, gfn) { |
Xiao Guangrong | 9ad17b10 | 2010-08-28 19:19:42 +0800 | [diff] [blame] | 2260 | pgprintk("%s: gfn %llx role %x\n", __func__, gfn, |
Xiao Guangrong | 7ae680e | 2010-06-04 21:53:07 +0800 | [diff] [blame] | 2261 | sp->role.word); |
| 2262 | r = 1; |
Xiao Guangrong | f41d335 | 2010-06-04 21:56:11 +0800 | [diff] [blame] | 2263 | kvm_mmu_prepare_zap_page(kvm, sp, &invalid_list); |
Xiao Guangrong | 7ae680e | 2010-06-04 21:53:07 +0800 | [diff] [blame] | 2264 | } |
Xiao Guangrong | d98ba05 | 2010-06-04 21:55:29 +0800 | [diff] [blame] | 2265 | kvm_mmu_commit_zap_page(kvm, &invalid_list); |
Xiao Guangrong | 1cb3f3a | 2011-09-22 17:02:48 +0800 | [diff] [blame] | 2266 | spin_unlock(&kvm->mmu_lock); |
| 2267 | |
Avi Kivity | a436036 | 2007-01-05 16:36:45 -0800 | [diff] [blame] | 2268 | return r; |
Avi Kivity | cea0f0e | 2007-01-05 16:36:43 -0800 | [diff] [blame] | 2269 | } |
Xiao Guangrong | 1cb3f3a | 2011-09-22 17:02:48 +0800 | [diff] [blame] | 2270 | EXPORT_SYMBOL_GPL(kvm_mmu_unprotect_page); |
Avi Kivity | cea0f0e | 2007-01-05 16:36:43 -0800 | [diff] [blame] | 2271 | |
Sheng Yang | 74be52e | 2008-10-09 16:01:56 +0800 | [diff] [blame] | 2272 | /* |
| 2273 | * The function is based on mtrr_type_lookup() in |
| 2274 | * arch/x86/kernel/cpu/mtrr/generic.c |
| 2275 | */ |
| 2276 | static int get_mtrr_type(struct mtrr_state_type *mtrr_state, |
| 2277 | u64 start, u64 end) |
| 2278 | { |
| 2279 | int i; |
| 2280 | u64 base, mask; |
| 2281 | u8 prev_match, curr_match; |
| 2282 | int num_var_ranges = KVM_NR_VAR_MTRR; |
| 2283 | |
| 2284 | if (!mtrr_state->enabled) |
| 2285 | return 0xFF; |
| 2286 | |
| 2287 | /* Make end inclusive end, instead of exclusive */ |
| 2288 | end--; |
| 2289 | |
| 2290 | /* Look in fixed ranges. Just return the type as per start */ |
| 2291 | if (mtrr_state->have_fixed && (start < 0x100000)) { |
| 2292 | int idx; |
| 2293 | |
| 2294 | if (start < 0x80000) { |
| 2295 | idx = 0; |
| 2296 | idx += (start >> 16); |
| 2297 | return mtrr_state->fixed_ranges[idx]; |
| 2298 | } else if (start < 0xC0000) { |
| 2299 | idx = 1 * 8; |
| 2300 | idx += ((start - 0x80000) >> 14); |
| 2301 | return mtrr_state->fixed_ranges[idx]; |
| 2302 | } else if (start < 0x1000000) { |
| 2303 | idx = 3 * 8; |
| 2304 | idx += ((start - 0xC0000) >> 12); |
| 2305 | return mtrr_state->fixed_ranges[idx]; |
| 2306 | } |
| 2307 | } |
| 2308 | |
| 2309 | /* |
| 2310 | * Look in variable ranges |
| 2311 | * Look of multiple ranges matching this address and pick type |
| 2312 | * as per MTRR precedence |
| 2313 | */ |
| 2314 | if (!(mtrr_state->enabled & 2)) |
| 2315 | return mtrr_state->def_type; |
| 2316 | |
| 2317 | prev_match = 0xFF; |
| 2318 | for (i = 0; i < num_var_ranges; ++i) { |
| 2319 | unsigned short start_state, end_state; |
| 2320 | |
| 2321 | if (!(mtrr_state->var_ranges[i].mask_lo & (1 << 11))) |
| 2322 | continue; |
| 2323 | |
| 2324 | base = (((u64)mtrr_state->var_ranges[i].base_hi) << 32) + |
| 2325 | (mtrr_state->var_ranges[i].base_lo & PAGE_MASK); |
| 2326 | mask = (((u64)mtrr_state->var_ranges[i].mask_hi) << 32) + |
| 2327 | (mtrr_state->var_ranges[i].mask_lo & PAGE_MASK); |
| 2328 | |
| 2329 | start_state = ((start & mask) == (base & mask)); |
| 2330 | end_state = ((end & mask) == (base & mask)); |
| 2331 | if (start_state != end_state) |
| 2332 | return 0xFE; |
| 2333 | |
| 2334 | if ((start & mask) != (base & mask)) |
| 2335 | continue; |
| 2336 | |
| 2337 | curr_match = mtrr_state->var_ranges[i].base_lo & 0xff; |
| 2338 | if (prev_match == 0xFF) { |
| 2339 | prev_match = curr_match; |
| 2340 | continue; |
| 2341 | } |
| 2342 | |
| 2343 | if (prev_match == MTRR_TYPE_UNCACHABLE || |
| 2344 | curr_match == MTRR_TYPE_UNCACHABLE) |
| 2345 | return MTRR_TYPE_UNCACHABLE; |
| 2346 | |
| 2347 | if ((prev_match == MTRR_TYPE_WRBACK && |
| 2348 | curr_match == MTRR_TYPE_WRTHROUGH) || |
| 2349 | (prev_match == MTRR_TYPE_WRTHROUGH && |
| 2350 | curr_match == MTRR_TYPE_WRBACK)) { |
| 2351 | prev_match = MTRR_TYPE_WRTHROUGH; |
| 2352 | curr_match = MTRR_TYPE_WRTHROUGH; |
| 2353 | } |
| 2354 | |
| 2355 | if (prev_match != curr_match) |
| 2356 | return MTRR_TYPE_UNCACHABLE; |
| 2357 | } |
| 2358 | |
| 2359 | if (prev_match != 0xFF) |
| 2360 | return prev_match; |
| 2361 | |
| 2362 | return mtrr_state->def_type; |
| 2363 | } |
| 2364 | |
Sheng Yang | 4b12f0d | 2009-04-27 20:35:42 +0800 | [diff] [blame] | 2365 | u8 kvm_get_guest_memory_type(struct kvm_vcpu *vcpu, gfn_t gfn) |
Sheng Yang | 74be52e | 2008-10-09 16:01:56 +0800 | [diff] [blame] | 2366 | { |
| 2367 | u8 mtrr; |
| 2368 | |
| 2369 | mtrr = get_mtrr_type(&vcpu->arch.mtrr_state, gfn << PAGE_SHIFT, |
| 2370 | (gfn << PAGE_SHIFT) + PAGE_SIZE); |
| 2371 | if (mtrr == 0xfe || mtrr == 0xff) |
| 2372 | mtrr = MTRR_TYPE_WRBACK; |
| 2373 | return mtrr; |
| 2374 | } |
Sheng Yang | 4b12f0d | 2009-04-27 20:35:42 +0800 | [diff] [blame] | 2375 | EXPORT_SYMBOL_GPL(kvm_get_guest_memory_type); |
Sheng Yang | 74be52e | 2008-10-09 16:01:56 +0800 | [diff] [blame] | 2376 | |
Xiao Guangrong | 9cf5cf5 | 2010-05-24 15:40:07 +0800 | [diff] [blame] | 2377 | static void __kvm_unsync_page(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp) |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 2378 | { |
Xiao Guangrong | 5e1b3dd | 2010-04-28 11:55:06 +0800 | [diff] [blame] | 2379 | trace_kvm_mmu_unsync_page(sp); |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 2380 | ++vcpu->kvm->stat.mmu_unsync; |
| 2381 | sp->unsync = 1; |
Marcelo Tosatti | 6cffe8c | 2008-12-01 22:32:04 -0200 | [diff] [blame] | 2382 | |
Xiao Guangrong | 6b18493 | 2010-04-16 21:29:17 +0800 | [diff] [blame] | 2383 | kvm_mmu_mark_parents_unsync(sp); |
Xiao Guangrong | 9cf5cf5 | 2010-05-24 15:40:07 +0800 | [diff] [blame] | 2384 | } |
| 2385 | |
| 2386 | static void kvm_unsync_pages(struct kvm_vcpu *vcpu, gfn_t gfn) |
| 2387 | { |
Xiao Guangrong | 9cf5cf5 | 2010-05-24 15:40:07 +0800 | [diff] [blame] | 2388 | struct kvm_mmu_page *s; |
Xiao Guangrong | 9cf5cf5 | 2010-05-24 15:40:07 +0800 | [diff] [blame] | 2389 | |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 2390 | for_each_gfn_indirect_valid_sp(vcpu->kvm, s, gfn) { |
Xiao Guangrong | 7ae680e | 2010-06-04 21:53:07 +0800 | [diff] [blame] | 2391 | if (s->unsync) |
Xiao Guangrong | 9cf5cf5 | 2010-05-24 15:40:07 +0800 | [diff] [blame] | 2392 | continue; |
| 2393 | WARN_ON(s->role.level != PT_PAGE_TABLE_LEVEL); |
| 2394 | __kvm_unsync_page(vcpu, s); |
| 2395 | } |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 2396 | } |
| 2397 | |
| 2398 | static int mmu_need_write_protect(struct kvm_vcpu *vcpu, gfn_t gfn, |
| 2399 | bool can_unsync) |
| 2400 | { |
Xiao Guangrong | 9cf5cf5 | 2010-05-24 15:40:07 +0800 | [diff] [blame] | 2401 | struct kvm_mmu_page *s; |
Xiao Guangrong | 9cf5cf5 | 2010-05-24 15:40:07 +0800 | [diff] [blame] | 2402 | bool need_unsync = false; |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 2403 | |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 2404 | for_each_gfn_indirect_valid_sp(vcpu->kvm, s, gfn) { |
Xiao Guangrong | 36a2e67 | 2010-06-30 16:02:02 +0800 | [diff] [blame] | 2405 | if (!can_unsync) |
| 2406 | return 1; |
| 2407 | |
Xiao Guangrong | 9cf5cf5 | 2010-05-24 15:40:07 +0800 | [diff] [blame] | 2408 | if (s->role.level != PT_PAGE_TABLE_LEVEL) |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 2409 | return 1; |
Xiao Guangrong | 9cf5cf5 | 2010-05-24 15:40:07 +0800 | [diff] [blame] | 2410 | |
Gleb Natapov | 9bb4f6b | 2013-01-30 16:45:01 +0200 | [diff] [blame] | 2411 | if (!s->unsync) |
Xiao Guangrong | 9cf5cf5 | 2010-05-24 15:40:07 +0800 | [diff] [blame] | 2412 | need_unsync = true; |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 2413 | } |
Xiao Guangrong | 9cf5cf5 | 2010-05-24 15:40:07 +0800 | [diff] [blame] | 2414 | if (need_unsync) |
| 2415 | kvm_unsync_pages(vcpu, gfn); |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 2416 | return 0; |
| 2417 | } |
| 2418 | |
Avi Kivity | d555c33 | 2009-06-10 14:24:23 +0300 | [diff] [blame] | 2419 | static int set_spte(struct kvm_vcpu *vcpu, u64 *sptep, |
Xiao Guangrong | c2288505 | 2013-01-08 14:36:04 +0800 | [diff] [blame] | 2420 | unsigned pte_access, int level, |
Marcelo Tosatti | c2d0ee4 | 2009-04-05 14:54:47 -0300 | [diff] [blame] | 2421 | gfn_t gfn, pfn_t pfn, bool speculative, |
Lai Jiangshan | 9bdbba1 | 2010-11-19 17:03:22 +0800 | [diff] [blame] | 2422 | bool can_unsync, bool host_writable) |
Avi Kivity | 1c4f1fd | 2007-12-09 17:40:31 +0200 | [diff] [blame] | 2423 | { |
Xiao Guangrong | 6e7d035 | 2012-06-20 15:58:33 +0800 | [diff] [blame] | 2424 | u64 spte; |
Marcelo Tosatti | 1e73f9d | 2008-09-23 13:18:30 -0300 | [diff] [blame] | 2425 | int ret = 0; |
Sheng Yang | 64d4d52 | 2008-10-09 16:01:57 +0800 | [diff] [blame] | 2426 | |
Xiao Guangrong | f2fd125 | 2013-06-07 16:51:24 +0800 | [diff] [blame] | 2427 | if (set_mmio_spte(vcpu->kvm, sptep, gfn, pfn, pte_access)) |
Xiao Guangrong | ce88dec | 2011-07-12 03:33:44 +0800 | [diff] [blame] | 2428 | return 0; |
| 2429 | |
Marcelo Tosatti | 982c256 | 2010-10-22 14:18:16 -0200 | [diff] [blame] | 2430 | spte = PT_PRESENT_MASK; |
Avi Kivity | 947da53 | 2008-03-18 11:05:52 +0200 | [diff] [blame] | 2431 | if (!speculative) |
Avi Kivity | 3201b5d | 2008-08-27 20:01:04 +0300 | [diff] [blame] | 2432 | spte |= shadow_accessed_mask; |
Xiao Guangrong | 640d9b0 | 2011-07-12 03:24:39 +0800 | [diff] [blame] | 2433 | |
Sheng Yang | 7b52345 | 2008-04-25 21:13:50 +0800 | [diff] [blame] | 2434 | if (pte_access & ACC_EXEC_MASK) |
| 2435 | spte |= shadow_x_mask; |
| 2436 | else |
| 2437 | spte |= shadow_nx_mask; |
Xiao Guangrong | 49fde34 | 2012-06-20 15:58:58 +0800 | [diff] [blame] | 2438 | |
Avi Kivity | 1c4f1fd | 2007-12-09 17:40:31 +0200 | [diff] [blame] | 2439 | if (pte_access & ACC_USER_MASK) |
Sheng Yang | 7b52345 | 2008-04-25 21:13:50 +0800 | [diff] [blame] | 2440 | spte |= shadow_user_mask; |
Xiao Guangrong | 49fde34 | 2012-06-20 15:58:58 +0800 | [diff] [blame] | 2441 | |
Joerg Roedel | 852e3c1 | 2009-07-27 16:30:44 +0200 | [diff] [blame] | 2442 | if (level > PT_PAGE_TABLE_LEVEL) |
Marcelo Tosatti | 05da455 | 2008-02-23 11:44:30 -0300 | [diff] [blame] | 2443 | spte |= PT_PAGE_SIZE_MASK; |
Avi Kivity | b0bc3ee | 2010-09-13 16:45:28 +0200 | [diff] [blame] | 2444 | if (tdp_enabled) |
Sheng Yang | 4b12f0d | 2009-04-27 20:35:42 +0800 | [diff] [blame] | 2445 | spte |= kvm_x86_ops->get_mt_mask(vcpu, gfn, |
| 2446 | kvm_is_mmio_pfn(pfn)); |
Avi Kivity | 1c4f1fd | 2007-12-09 17:40:31 +0200 | [diff] [blame] | 2447 | |
Lai Jiangshan | 9bdbba1 | 2010-11-19 17:03:22 +0800 | [diff] [blame] | 2448 | if (host_writable) |
Izik Eidus | 1403283 | 2009-09-23 21:47:17 +0300 | [diff] [blame] | 2449 | spte |= SPTE_HOST_WRITEABLE; |
Xiao Guangrong | f8e453b | 2010-12-23 16:09:29 +0800 | [diff] [blame] | 2450 | else |
| 2451 | pte_access &= ~ACC_WRITE_MASK; |
Izik Eidus | 1403283 | 2009-09-23 21:47:17 +0300 | [diff] [blame] | 2452 | |
Anthony Liguori | 35149e2 | 2008-04-02 14:46:56 -0500 | [diff] [blame] | 2453 | spte |= (u64)pfn << PAGE_SHIFT; |
Avi Kivity | 1c4f1fd | 2007-12-09 17:40:31 +0200 | [diff] [blame] | 2454 | |
Xiao Guangrong | c2288505 | 2013-01-08 14:36:04 +0800 | [diff] [blame] | 2455 | if (pte_access & ACC_WRITE_MASK) { |
Avi Kivity | 1c4f1fd | 2007-12-09 17:40:31 +0200 | [diff] [blame] | 2456 | |
Xiao Guangrong | c219346 | 2012-12-04 07:17:11 +0800 | [diff] [blame] | 2457 | /* |
Xiao Guangrong | 7751bab | 2013-01-08 14:36:51 +0800 | [diff] [blame] | 2458 | * Other vcpu creates new sp in the window between |
| 2459 | * mapping_level() and acquiring mmu-lock. We can |
| 2460 | * allow guest to retry the access, the mapping can |
| 2461 | * be fixed if guest refault. |
Xiao Guangrong | c219346 | 2012-12-04 07:17:11 +0800 | [diff] [blame] | 2462 | */ |
Joerg Roedel | 852e3c1 | 2009-07-27 16:30:44 +0200 | [diff] [blame] | 2463 | if (level > PT_PAGE_TABLE_LEVEL && |
Xiao Guangrong | c219346 | 2012-12-04 07:17:11 +0800 | [diff] [blame] | 2464 | has_wrprotected_page(vcpu->kvm, gfn, level)) |
Avi Kivity | be38d27 | 2010-06-06 14:31:27 +0300 | [diff] [blame] | 2465 | goto done; |
Marcelo Tosatti | 38187c8 | 2008-09-23 13:18:32 -0300 | [diff] [blame] | 2466 | |
Xiao Guangrong | 49fde34 | 2012-06-20 15:58:58 +0800 | [diff] [blame] | 2467 | spte |= PT_WRITABLE_MASK | SPTE_MMU_WRITEABLE; |
Avi Kivity | 1c4f1fd | 2007-12-09 17:40:31 +0200 | [diff] [blame] | 2468 | |
Marcelo Tosatti | ecc5589 | 2008-11-25 15:58:07 +0100 | [diff] [blame] | 2469 | /* |
| 2470 | * Optimization: for pte sync, if spte was writable the hash |
| 2471 | * lookup is unnecessary (and expensive). Write protection |
| 2472 | * is responsibility of mmu_get_page / kvm_sync_page. |
| 2473 | * Same reasoning can be applied to dirty page accounting. |
| 2474 | */ |
Takuya Yoshikawa | 8dae444 | 2010-01-18 18:45:10 +0900 | [diff] [blame] | 2475 | if (!can_unsync && is_writable_pte(*sptep)) |
Marcelo Tosatti | ecc5589 | 2008-11-25 15:58:07 +0100 | [diff] [blame] | 2476 | goto set_pte; |
| 2477 | |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 2478 | if (mmu_need_write_protect(vcpu, gfn, can_unsync)) { |
Xiao Guangrong | 9ad17b10 | 2010-08-28 19:19:42 +0800 | [diff] [blame] | 2479 | pgprintk("%s: found shadow page for %llx, marking ro\n", |
Harvey Harrison | b8688d5 | 2008-03-03 12:59:56 -0800 | [diff] [blame] | 2480 | __func__, gfn); |
Marcelo Tosatti | 1e73f9d | 2008-09-23 13:18:30 -0300 | [diff] [blame] | 2481 | ret = 1; |
Avi Kivity | 1c4f1fd | 2007-12-09 17:40:31 +0200 | [diff] [blame] | 2482 | pte_access &= ~ACC_WRITE_MASK; |
Xiao Guangrong | 49fde34 | 2012-06-20 15:58:58 +0800 | [diff] [blame] | 2483 | spte &= ~(PT_WRITABLE_MASK | SPTE_MMU_WRITEABLE); |
Avi Kivity | 1c4f1fd | 2007-12-09 17:40:31 +0200 | [diff] [blame] | 2484 | } |
| 2485 | } |
| 2486 | |
Avi Kivity | 1c4f1fd | 2007-12-09 17:40:31 +0200 | [diff] [blame] | 2487 | if (pte_access & ACC_WRITE_MASK) |
| 2488 | mark_page_dirty(vcpu->kvm, gfn); |
| 2489 | |
Marcelo Tosatti | 38187c8 | 2008-09-23 13:18:32 -0300 | [diff] [blame] | 2490 | set_pte: |
Xiao Guangrong | 6e7d035 | 2012-06-20 15:58:33 +0800 | [diff] [blame] | 2491 | if (mmu_spte_update(sptep, spte)) |
Xiao Guangrong | b330aa0 | 2010-11-19 17:02:35 +0800 | [diff] [blame] | 2492 | kvm_flush_remote_tlbs(vcpu->kvm); |
Avi Kivity | be38d27 | 2010-06-06 14:31:27 +0300 | [diff] [blame] | 2493 | done: |
Marcelo Tosatti | 1e73f9d | 2008-09-23 13:18:30 -0300 | [diff] [blame] | 2494 | return ret; |
| 2495 | } |
| 2496 | |
Avi Kivity | d555c33 | 2009-06-10 14:24:23 +0300 | [diff] [blame] | 2497 | static void mmu_set_spte(struct kvm_vcpu *vcpu, u64 *sptep, |
Xiao Guangrong | f761620 | 2013-02-05 15:27:27 +0800 | [diff] [blame] | 2498 | unsigned pte_access, int write_fault, int *emulate, |
| 2499 | int level, gfn_t gfn, pfn_t pfn, bool speculative, |
| 2500 | bool host_writable) |
Marcelo Tosatti | 1e73f9d | 2008-09-23 13:18:30 -0300 | [diff] [blame] | 2501 | { |
| 2502 | int was_rmapped = 0; |
Marcelo Tosatti | 53a27b3 | 2009-08-05 15:43:58 -0300 | [diff] [blame] | 2503 | int rmap_count; |
Marcelo Tosatti | 1e73f9d | 2008-09-23 13:18:30 -0300 | [diff] [blame] | 2504 | |
Xiao Guangrong | f761620 | 2013-02-05 15:27:27 +0800 | [diff] [blame] | 2505 | pgprintk("%s: spte %llx write_fault %d gfn %llx\n", __func__, |
| 2506 | *sptep, write_fault, gfn); |
Marcelo Tosatti | 1e73f9d | 2008-09-23 13:18:30 -0300 | [diff] [blame] | 2507 | |
Avi Kivity | d555c33 | 2009-06-10 14:24:23 +0300 | [diff] [blame] | 2508 | if (is_rmap_spte(*sptep)) { |
Marcelo Tosatti | 1e73f9d | 2008-09-23 13:18:30 -0300 | [diff] [blame] | 2509 | /* |
| 2510 | * If we overwrite a PTE page pointer with a 2MB PMD, unlink |
| 2511 | * the parent of the now unreachable PTE. |
| 2512 | */ |
Joerg Roedel | 852e3c1 | 2009-07-27 16:30:44 +0200 | [diff] [blame] | 2513 | if (level > PT_PAGE_TABLE_LEVEL && |
| 2514 | !is_large_pte(*sptep)) { |
Marcelo Tosatti | 1e73f9d | 2008-09-23 13:18:30 -0300 | [diff] [blame] | 2515 | struct kvm_mmu_page *child; |
Avi Kivity | d555c33 | 2009-06-10 14:24:23 +0300 | [diff] [blame] | 2516 | u64 pte = *sptep; |
Marcelo Tosatti | 1e73f9d | 2008-09-23 13:18:30 -0300 | [diff] [blame] | 2517 | |
| 2518 | child = page_header(pte & PT64_BASE_ADDR_MASK); |
Xiao Guangrong | bcdd9a9 | 2011-05-15 23:28:29 +0800 | [diff] [blame] | 2519 | drop_parent_pte(child, sptep); |
Marcelo Tosatti | 3be2264 | 2010-05-28 09:44:59 -0300 | [diff] [blame] | 2520 | kvm_flush_remote_tlbs(vcpu->kvm); |
Avi Kivity | d555c33 | 2009-06-10 14:24:23 +0300 | [diff] [blame] | 2521 | } else if (pfn != spte_to_pfn(*sptep)) { |
Xiao Guangrong | 9ad17b10 | 2010-08-28 19:19:42 +0800 | [diff] [blame] | 2522 | pgprintk("hfn old %llx new %llx\n", |
Avi Kivity | d555c33 | 2009-06-10 14:24:23 +0300 | [diff] [blame] | 2523 | spte_to_pfn(*sptep), pfn); |
Xiao Guangrong | c370795 | 2011-07-12 03:28:04 +0800 | [diff] [blame] | 2524 | drop_spte(vcpu->kvm, sptep); |
Xiao Guangrong | 9154635 | 2010-06-30 16:04:06 +0800 | [diff] [blame] | 2525 | kvm_flush_remote_tlbs(vcpu->kvm); |
Joerg Roedel | 6bed6b9 | 2009-02-18 14:08:59 +0100 | [diff] [blame] | 2526 | } else |
| 2527 | was_rmapped = 1; |
Marcelo Tosatti | 1e73f9d | 2008-09-23 13:18:30 -0300 | [diff] [blame] | 2528 | } |
Joerg Roedel | 852e3c1 | 2009-07-27 16:30:44 +0200 | [diff] [blame] | 2529 | |
Xiao Guangrong | c2288505 | 2013-01-08 14:36:04 +0800 | [diff] [blame] | 2530 | if (set_spte(vcpu, sptep, pte_access, level, gfn, pfn, speculative, |
| 2531 | true, host_writable)) { |
Marcelo Tosatti | 1e73f9d | 2008-09-23 13:18:30 -0300 | [diff] [blame] | 2532 | if (write_fault) |
Xiao Guangrong | b90a0e6 | 2011-07-12 03:25:56 +0800 | [diff] [blame] | 2533 | *emulate = 1; |
Xiao Guangrong | 5304efd | 2010-06-08 20:05:57 +0800 | [diff] [blame] | 2534 | kvm_mmu_flush_tlb(vcpu); |
Marcelo Tosatti | a378b4e | 2008-09-23 13:18:31 -0300 | [diff] [blame] | 2535 | } |
Marcelo Tosatti | 1e73f9d | 2008-09-23 13:18:30 -0300 | [diff] [blame] | 2536 | |
Xiao Guangrong | ce88dec | 2011-07-12 03:33:44 +0800 | [diff] [blame] | 2537 | if (unlikely(is_mmio_spte(*sptep) && emulate)) |
| 2538 | *emulate = 1; |
| 2539 | |
Avi Kivity | d555c33 | 2009-06-10 14:24:23 +0300 | [diff] [blame] | 2540 | pgprintk("%s: setting spte %llx\n", __func__, *sptep); |
Xiao Guangrong | 9ad17b10 | 2010-08-28 19:19:42 +0800 | [diff] [blame] | 2541 | pgprintk("instantiating %s PTE (%s) at %llx (%llx) addr %p\n", |
Avi Kivity | d555c33 | 2009-06-10 14:24:23 +0300 | [diff] [blame] | 2542 | is_large_pte(*sptep)? "2MB" : "4kB", |
Joerg Roedel | a205bc1 | 2009-07-09 16:36:01 +0200 | [diff] [blame] | 2543 | *sptep & PT_PRESENT_MASK ?"RW":"R", gfn, |
| 2544 | *sptep, sptep); |
Avi Kivity | d555c33 | 2009-06-10 14:24:23 +0300 | [diff] [blame] | 2545 | if (!was_rmapped && is_large_pte(*sptep)) |
Marcelo Tosatti | 05da455 | 2008-02-23 11:44:30 -0300 | [diff] [blame] | 2546 | ++vcpu->kvm->stat.lpages; |
| 2547 | |
Xiao Guangrong | ffb61bb | 2011-07-12 03:22:01 +0800 | [diff] [blame] | 2548 | if (is_shadow_present_pte(*sptep)) { |
Xiao Guangrong | ffb61bb | 2011-07-12 03:22:01 +0800 | [diff] [blame] | 2549 | if (!was_rmapped) { |
| 2550 | rmap_count = rmap_add(vcpu, sptep, gfn); |
| 2551 | if (rmap_count > RMAP_RECYCLE_THRESHOLD) |
| 2552 | rmap_recycle(vcpu, sptep, gfn); |
| 2553 | } |
Avi Kivity | 1c4f1fd | 2007-12-09 17:40:31 +0200 | [diff] [blame] | 2554 | } |
Xiao Guangrong | cb9aaa3 | 2012-08-03 15:42:10 +0800 | [diff] [blame] | 2555 | |
Xiao Guangrong | f3ac1a4 | 2012-10-16 20:07:03 +0800 | [diff] [blame] | 2556 | kvm_release_pfn_clean(pfn); |
Avi Kivity | 1c4f1fd | 2007-12-09 17:40:31 +0200 | [diff] [blame] | 2557 | } |
| 2558 | |
Xiao Guangrong | 957ed9e | 2010-08-22 19:12:48 +0800 | [diff] [blame] | 2559 | static pfn_t pte_prefetch_gfn_to_pfn(struct kvm_vcpu *vcpu, gfn_t gfn, |
| 2560 | bool no_dirty_log) |
| 2561 | { |
| 2562 | struct kvm_memory_slot *slot; |
Xiao Guangrong | 957ed9e | 2010-08-22 19:12:48 +0800 | [diff] [blame] | 2563 | |
Xiao Guangrong | 5d163b1 | 2011-03-09 15:43:00 +0800 | [diff] [blame] | 2564 | slot = gfn_to_memslot_dirty_bitmap(vcpu, gfn, no_dirty_log); |
Xiao Guangrong | 903816f | 2012-07-17 21:54:11 +0800 | [diff] [blame] | 2565 | if (!slot) |
Xiao Guangrong | 6c8ee57 | 2012-08-03 15:37:54 +0800 | [diff] [blame] | 2566 | return KVM_PFN_ERR_FAULT; |
Xiao Guangrong | 957ed9e | 2010-08-22 19:12:48 +0800 | [diff] [blame] | 2567 | |
Xiao Guangrong | 037d92d | 2012-08-21 10:59:12 +0800 | [diff] [blame] | 2568 | return gfn_to_pfn_memslot_atomic(slot, gfn); |
Xiao Guangrong | 957ed9e | 2010-08-22 19:12:48 +0800 | [diff] [blame] | 2569 | } |
| 2570 | |
| 2571 | static int direct_pte_prefetch_many(struct kvm_vcpu *vcpu, |
| 2572 | struct kvm_mmu_page *sp, |
| 2573 | u64 *start, u64 *end) |
| 2574 | { |
| 2575 | struct page *pages[PTE_PREFETCH_NUM]; |
| 2576 | unsigned access = sp->role.access; |
| 2577 | int i, ret; |
| 2578 | gfn_t gfn; |
| 2579 | |
| 2580 | gfn = kvm_mmu_page_get_gfn(sp, start - sp->spt); |
Xiao Guangrong | 5d163b1 | 2011-03-09 15:43:00 +0800 | [diff] [blame] | 2581 | if (!gfn_to_memslot_dirty_bitmap(vcpu, gfn, access & ACC_WRITE_MASK)) |
Xiao Guangrong | 957ed9e | 2010-08-22 19:12:48 +0800 | [diff] [blame] | 2582 | return -1; |
| 2583 | |
| 2584 | ret = gfn_to_page_many_atomic(vcpu->kvm, gfn, pages, end - start); |
| 2585 | if (ret <= 0) |
| 2586 | return -1; |
| 2587 | |
| 2588 | for (i = 0; i < ret; i++, gfn++, start++) |
Xiao Guangrong | f761620 | 2013-02-05 15:27:27 +0800 | [diff] [blame] | 2589 | mmu_set_spte(vcpu, start, access, 0, NULL, |
Xiao Guangrong | c2288505 | 2013-01-08 14:36:04 +0800 | [diff] [blame] | 2590 | sp->role.level, gfn, page_to_pfn(pages[i]), |
| 2591 | true, true); |
Xiao Guangrong | 957ed9e | 2010-08-22 19:12:48 +0800 | [diff] [blame] | 2592 | |
| 2593 | return 0; |
| 2594 | } |
| 2595 | |
| 2596 | static void __direct_pte_prefetch(struct kvm_vcpu *vcpu, |
| 2597 | struct kvm_mmu_page *sp, u64 *sptep) |
| 2598 | { |
| 2599 | u64 *spte, *start = NULL; |
| 2600 | int i; |
| 2601 | |
| 2602 | WARN_ON(!sp->role.direct); |
| 2603 | |
| 2604 | i = (sptep - sp->spt) & ~(PTE_PREFETCH_NUM - 1); |
| 2605 | spte = sp->spt + i; |
| 2606 | |
| 2607 | for (i = 0; i < PTE_PREFETCH_NUM; i++, spte++) { |
Xiao Guangrong | c370795 | 2011-07-12 03:28:04 +0800 | [diff] [blame] | 2608 | if (is_shadow_present_pte(*spte) || spte == sptep) { |
Xiao Guangrong | 957ed9e | 2010-08-22 19:12:48 +0800 | [diff] [blame] | 2609 | if (!start) |
| 2610 | continue; |
| 2611 | if (direct_pte_prefetch_many(vcpu, sp, start, spte) < 0) |
| 2612 | break; |
| 2613 | start = NULL; |
| 2614 | } else if (!start) |
| 2615 | start = spte; |
| 2616 | } |
| 2617 | } |
| 2618 | |
| 2619 | static void direct_pte_prefetch(struct kvm_vcpu *vcpu, u64 *sptep) |
| 2620 | { |
| 2621 | struct kvm_mmu_page *sp; |
| 2622 | |
| 2623 | /* |
| 2624 | * Since it's no accessed bit on EPT, it's no way to |
| 2625 | * distinguish between actually accessed translations |
| 2626 | * and prefetched, so disable pte prefetch if EPT is |
| 2627 | * enabled. |
| 2628 | */ |
| 2629 | if (!shadow_accessed_mask) |
| 2630 | return; |
| 2631 | |
| 2632 | sp = page_header(__pa(sptep)); |
| 2633 | if (sp->role.level > PT_PAGE_TABLE_LEVEL) |
| 2634 | return; |
| 2635 | |
| 2636 | __direct_pte_prefetch(vcpu, sp, sptep); |
| 2637 | } |
| 2638 | |
Joerg Roedel | 4d9976b | 2008-02-07 13:47:42 +0100 | [diff] [blame] | 2639 | static int __direct_map(struct kvm_vcpu *vcpu, gpa_t v, int write, |
Xiao Guangrong | 2ec4739 | 2010-12-07 10:34:42 +0800 | [diff] [blame] | 2640 | int map_writable, int level, gfn_t gfn, pfn_t pfn, |
| 2641 | bool prefault) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 2642 | { |
Avi Kivity | 9f652d2 | 2008-12-25 14:54:25 +0200 | [diff] [blame] | 2643 | struct kvm_shadow_walk_iterator iterator; |
| 2644 | struct kvm_mmu_page *sp; |
Xiao Guangrong | b90a0e6 | 2011-07-12 03:25:56 +0800 | [diff] [blame] | 2645 | int emulate = 0; |
Avi Kivity | 9f652d2 | 2008-12-25 14:54:25 +0200 | [diff] [blame] | 2646 | gfn_t pseudo_gfn; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 2647 | |
Marcelo Tosatti | 989c6b3 | 2013-12-19 15:28:51 -0200 | [diff] [blame] | 2648 | if (!VALID_PAGE(vcpu->arch.mmu.root_hpa)) |
| 2649 | return 0; |
| 2650 | |
Avi Kivity | 9f652d2 | 2008-12-25 14:54:25 +0200 | [diff] [blame] | 2651 | for_each_shadow_entry(vcpu, (u64)gfn << PAGE_SHIFT, iterator) { |
Joerg Roedel | 852e3c1 | 2009-07-27 16:30:44 +0200 | [diff] [blame] | 2652 | if (iterator.level == level) { |
Xiao Guangrong | f761620 | 2013-02-05 15:27:27 +0800 | [diff] [blame] | 2653 | mmu_set_spte(vcpu, iterator.sptep, ACC_ALL, |
Xiao Guangrong | c2288505 | 2013-01-08 14:36:04 +0800 | [diff] [blame] | 2654 | write, &emulate, level, gfn, pfn, |
| 2655 | prefault, map_writable); |
Xiao Guangrong | 957ed9e | 2010-08-22 19:12:48 +0800 | [diff] [blame] | 2656 | direct_pte_prefetch(vcpu, iterator.sptep); |
Avi Kivity | 9f652d2 | 2008-12-25 14:54:25 +0200 | [diff] [blame] | 2657 | ++vcpu->stat.pf_fixed; |
| 2658 | break; |
| 2659 | } |
| 2660 | |
Marcelo Tosatti | 404381c | 2014-02-24 13:59:32 -0300 | [diff] [blame] | 2661 | drop_large_spte(vcpu, iterator.sptep); |
Xiao Guangrong | c370795 | 2011-07-12 03:28:04 +0800 | [diff] [blame] | 2662 | if (!is_shadow_present_pte(*iterator.sptep)) { |
Lai Jiangshan | c9fa0b3 | 2010-05-26 16:48:25 +0800 | [diff] [blame] | 2663 | u64 base_addr = iterator.addr; |
| 2664 | |
| 2665 | base_addr &= PT64_LVL_ADDR_MASK(iterator.level); |
| 2666 | pseudo_gfn = base_addr >> PAGE_SHIFT; |
Avi Kivity | 9f652d2 | 2008-12-25 14:54:25 +0200 | [diff] [blame] | 2667 | sp = kvm_mmu_get_page(vcpu, pseudo_gfn, iterator.addr, |
| 2668 | iterator.level - 1, |
| 2669 | 1, ACC_ALL, iterator.sptep); |
Avi Kivity | 9f652d2 | 2008-12-25 14:54:25 +0200 | [diff] [blame] | 2670 | |
Yang Zhang | 7a1638c | 2013-08-05 11:07:13 +0300 | [diff] [blame] | 2671 | link_shadow_page(iterator.sptep, sp, true); |
Avi Kivity | 9f652d2 | 2008-12-25 14:54:25 +0200 | [diff] [blame] | 2672 | } |
| 2673 | } |
Xiao Guangrong | b90a0e6 | 2011-07-12 03:25:56 +0800 | [diff] [blame] | 2674 | return emulate; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 2675 | } |
| 2676 | |
Huang Ying | 77db5cb | 2010-10-08 16:24:15 +0800 | [diff] [blame] | 2677 | static void kvm_send_hwpoison_signal(unsigned long address, struct task_struct *tsk) |
Huang Ying | bf99815 | 2010-05-31 14:28:19 +0800 | [diff] [blame] | 2678 | { |
Huang Ying | 77db5cb | 2010-10-08 16:24:15 +0800 | [diff] [blame] | 2679 | siginfo_t info; |
Huang Ying | bf99815 | 2010-05-31 14:28:19 +0800 | [diff] [blame] | 2680 | |
Huang Ying | 77db5cb | 2010-10-08 16:24:15 +0800 | [diff] [blame] | 2681 | info.si_signo = SIGBUS; |
| 2682 | info.si_errno = 0; |
| 2683 | info.si_code = BUS_MCEERR_AR; |
| 2684 | info.si_addr = (void __user *)address; |
| 2685 | info.si_addr_lsb = PAGE_SHIFT; |
| 2686 | |
| 2687 | send_sig_info(SIGBUS, &info, tsk); |
Huang Ying | bf99815 | 2010-05-31 14:28:19 +0800 | [diff] [blame] | 2688 | } |
| 2689 | |
Xiao Guangrong | d7c5520 | 2011-07-12 03:29:38 +0800 | [diff] [blame] | 2690 | static int kvm_handle_bad_page(struct kvm_vcpu *vcpu, gfn_t gfn, pfn_t pfn) |
Huang Ying | bf99815 | 2010-05-31 14:28:19 +0800 | [diff] [blame] | 2691 | { |
Xiao Guangrong | 4d8b81a | 2012-08-21 11:02:51 +0800 | [diff] [blame] | 2692 | /* |
| 2693 | * Do not cache the mmio info caused by writing the readonly gfn |
| 2694 | * into the spte otherwise read access on readonly gfn also can |
| 2695 | * caused mmio page fault and treat it as mmio access. |
| 2696 | * Return 1 to tell kvm to emulate it. |
| 2697 | */ |
| 2698 | if (pfn == KVM_PFN_ERR_RO_FAULT) |
| 2699 | return 1; |
| 2700 | |
Xiao Guangrong | e6c1502 | 2012-08-03 15:38:36 +0800 | [diff] [blame] | 2701 | if (pfn == KVM_PFN_ERR_HWPOISON) { |
Xiao Guangrong | bebb106 | 2011-07-12 03:23:20 +0800 | [diff] [blame] | 2702 | kvm_send_hwpoison_signal(gfn_to_hva(vcpu->kvm, gfn), current); |
Huang Ying | bf99815 | 2010-05-31 14:28:19 +0800 | [diff] [blame] | 2703 | return 0; |
Xiao Guangrong | d7c5520 | 2011-07-12 03:29:38 +0800 | [diff] [blame] | 2704 | } |
Gleb Natapov | edba23e | 2010-07-07 20:16:45 +0300 | [diff] [blame] | 2705 | |
Xiao Guangrong | d7c5520 | 2011-07-12 03:29:38 +0800 | [diff] [blame] | 2706 | return -EFAULT; |
Huang Ying | bf99815 | 2010-05-31 14:28:19 +0800 | [diff] [blame] | 2707 | } |
| 2708 | |
Andrea Arcangeli | 936a5fe | 2011-01-13 15:46:48 -0800 | [diff] [blame] | 2709 | static void transparent_hugepage_adjust(struct kvm_vcpu *vcpu, |
| 2710 | gfn_t *gfnp, pfn_t *pfnp, int *levelp) |
| 2711 | { |
| 2712 | pfn_t pfn = *pfnp; |
| 2713 | gfn_t gfn = *gfnp; |
| 2714 | int level = *levelp; |
| 2715 | |
| 2716 | /* |
| 2717 | * Check if it's a transparent hugepage. If this would be an |
| 2718 | * hugetlbfs page, level wouldn't be set to |
| 2719 | * PT_PAGE_TABLE_LEVEL and there would be no adjustment done |
| 2720 | * here. |
| 2721 | */ |
Xiao Guangrong | 81c52c5 | 2012-10-16 20:10:59 +0800 | [diff] [blame] | 2722 | if (!is_error_noslot_pfn(pfn) && !kvm_is_mmio_pfn(pfn) && |
Andrea Arcangeli | 936a5fe | 2011-01-13 15:46:48 -0800 | [diff] [blame] | 2723 | level == PT_PAGE_TABLE_LEVEL && |
| 2724 | PageTransCompound(pfn_to_page(pfn)) && |
| 2725 | !has_wrprotected_page(vcpu->kvm, gfn, PT_DIRECTORY_LEVEL)) { |
| 2726 | unsigned long mask; |
| 2727 | /* |
| 2728 | * mmu_notifier_retry was successful and we hold the |
| 2729 | * mmu_lock here, so the pmd can't become splitting |
| 2730 | * from under us, and in turn |
| 2731 | * __split_huge_page_refcount() can't run from under |
| 2732 | * us and we can safely transfer the refcount from |
| 2733 | * PG_tail to PG_head as we switch the pfn to tail to |
| 2734 | * head. |
| 2735 | */ |
| 2736 | *levelp = level = PT_DIRECTORY_LEVEL; |
| 2737 | mask = KVM_PAGES_PER_HPAGE(level) - 1; |
| 2738 | VM_BUG_ON((gfn & mask) != (pfn & mask)); |
| 2739 | if (pfn & mask) { |
| 2740 | gfn &= ~mask; |
| 2741 | *gfnp = gfn; |
| 2742 | kvm_release_pfn_clean(pfn); |
| 2743 | pfn &= ~mask; |
Xiao Guangrong | c358666 | 2012-05-28 14:10:43 +0800 | [diff] [blame] | 2744 | kvm_get_pfn(pfn); |
Andrea Arcangeli | 936a5fe | 2011-01-13 15:46:48 -0800 | [diff] [blame] | 2745 | *pfnp = pfn; |
| 2746 | } |
| 2747 | } |
| 2748 | } |
| 2749 | |
Xiao Guangrong | d7c5520 | 2011-07-12 03:29:38 +0800 | [diff] [blame] | 2750 | static bool handle_abnormal_pfn(struct kvm_vcpu *vcpu, gva_t gva, gfn_t gfn, |
| 2751 | pfn_t pfn, unsigned access, int *ret_val) |
| 2752 | { |
| 2753 | bool ret = true; |
| 2754 | |
| 2755 | /* The pfn is invalid, report the error! */ |
Xiao Guangrong | 81c52c5 | 2012-10-16 20:10:59 +0800 | [diff] [blame] | 2756 | if (unlikely(is_error_pfn(pfn))) { |
Xiao Guangrong | d7c5520 | 2011-07-12 03:29:38 +0800 | [diff] [blame] | 2757 | *ret_val = kvm_handle_bad_page(vcpu, gfn, pfn); |
| 2758 | goto exit; |
| 2759 | } |
| 2760 | |
Xiao Guangrong | ce88dec | 2011-07-12 03:33:44 +0800 | [diff] [blame] | 2761 | if (unlikely(is_noslot_pfn(pfn))) |
Xiao Guangrong | d7c5520 | 2011-07-12 03:29:38 +0800 | [diff] [blame] | 2762 | vcpu_cache_mmio_info(vcpu, gva, gfn, access); |
Xiao Guangrong | d7c5520 | 2011-07-12 03:29:38 +0800 | [diff] [blame] | 2763 | |
| 2764 | ret = false; |
| 2765 | exit: |
| 2766 | return ret; |
| 2767 | } |
| 2768 | |
Xiao Guangrong | e5552fd | 2013-07-30 21:01:59 +0800 | [diff] [blame] | 2769 | static bool page_fault_can_be_fast(u32 error_code) |
Xiao Guangrong | c7ba5b4 | 2012-06-20 15:59:18 +0800 | [diff] [blame] | 2770 | { |
| 2771 | /* |
Xiao Guangrong | 1c118b8 | 2013-07-18 12:52:37 +0800 | [diff] [blame] | 2772 | * Do not fix the mmio spte with invalid generation number which |
| 2773 | * need to be updated by slow page fault path. |
| 2774 | */ |
| 2775 | if (unlikely(error_code & PFERR_RSVD_MASK)) |
| 2776 | return false; |
| 2777 | |
| 2778 | /* |
Xiao Guangrong | c7ba5b4 | 2012-06-20 15:59:18 +0800 | [diff] [blame] | 2779 | * #PF can be fast only if the shadow page table is present and it |
| 2780 | * is caused by write-protect, that means we just need change the |
| 2781 | * W bit of the spte which can be done out of mmu-lock. |
| 2782 | */ |
| 2783 | if (!(error_code & PFERR_PRESENT_MASK) || |
| 2784 | !(error_code & PFERR_WRITE_MASK)) |
| 2785 | return false; |
| 2786 | |
| 2787 | return true; |
| 2788 | } |
| 2789 | |
| 2790 | static bool |
Xiao Guangrong | 92a476c | 2014-04-17 17:06:13 +0800 | [diff] [blame] | 2791 | fast_pf_fix_direct_spte(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp, |
| 2792 | u64 *sptep, u64 spte) |
Xiao Guangrong | c7ba5b4 | 2012-06-20 15:59:18 +0800 | [diff] [blame] | 2793 | { |
Xiao Guangrong | c7ba5b4 | 2012-06-20 15:59:18 +0800 | [diff] [blame] | 2794 | gfn_t gfn; |
| 2795 | |
| 2796 | WARN_ON(!sp->role.direct); |
| 2797 | |
| 2798 | /* |
| 2799 | * The gfn of direct spte is stable since it is calculated |
| 2800 | * by sp->gfn. |
| 2801 | */ |
| 2802 | gfn = kvm_mmu_page_get_gfn(sp, sptep - sp->spt); |
| 2803 | |
| 2804 | if (cmpxchg64(sptep, spte, spte | PT_WRITABLE_MASK) == spte) |
| 2805 | mark_page_dirty(vcpu->kvm, gfn); |
| 2806 | |
| 2807 | return true; |
| 2808 | } |
| 2809 | |
| 2810 | /* |
| 2811 | * Return value: |
| 2812 | * - true: let the vcpu to access on the same address again. |
| 2813 | * - false: let the real page fault path to fix it. |
| 2814 | */ |
| 2815 | static bool fast_page_fault(struct kvm_vcpu *vcpu, gva_t gva, int level, |
| 2816 | u32 error_code) |
| 2817 | { |
| 2818 | struct kvm_shadow_walk_iterator iterator; |
Xiao Guangrong | 92a476c | 2014-04-17 17:06:13 +0800 | [diff] [blame] | 2819 | struct kvm_mmu_page *sp; |
Xiao Guangrong | c7ba5b4 | 2012-06-20 15:59:18 +0800 | [diff] [blame] | 2820 | bool ret = false; |
| 2821 | u64 spte = 0ull; |
| 2822 | |
Marcelo Tosatti | 37f6a4e | 2014-01-03 17:09:32 -0200 | [diff] [blame] | 2823 | if (!VALID_PAGE(vcpu->arch.mmu.root_hpa)) |
| 2824 | return false; |
| 2825 | |
Xiao Guangrong | e5552fd | 2013-07-30 21:01:59 +0800 | [diff] [blame] | 2826 | if (!page_fault_can_be_fast(error_code)) |
Xiao Guangrong | c7ba5b4 | 2012-06-20 15:59:18 +0800 | [diff] [blame] | 2827 | return false; |
| 2828 | |
| 2829 | walk_shadow_page_lockless_begin(vcpu); |
| 2830 | for_each_shadow_entry_lockless(vcpu, gva, iterator, spte) |
| 2831 | if (!is_shadow_present_pte(spte) || iterator.level < level) |
| 2832 | break; |
| 2833 | |
| 2834 | /* |
| 2835 | * If the mapping has been changed, let the vcpu fault on the |
| 2836 | * same address again. |
| 2837 | */ |
| 2838 | if (!is_rmap_spte(spte)) { |
| 2839 | ret = true; |
| 2840 | goto exit; |
| 2841 | } |
| 2842 | |
Xiao Guangrong | 92a476c | 2014-04-17 17:06:13 +0800 | [diff] [blame] | 2843 | sp = page_header(__pa(iterator.sptep)); |
| 2844 | if (!is_last_spte(spte, sp->role.level)) |
Xiao Guangrong | c7ba5b4 | 2012-06-20 15:59:18 +0800 | [diff] [blame] | 2845 | goto exit; |
| 2846 | |
| 2847 | /* |
| 2848 | * Check if it is a spurious fault caused by TLB lazily flushed. |
| 2849 | * |
| 2850 | * Need not check the access of upper level table entries since |
| 2851 | * they are always ACC_ALL. |
| 2852 | */ |
| 2853 | if (is_writable_pte(spte)) { |
| 2854 | ret = true; |
| 2855 | goto exit; |
| 2856 | } |
| 2857 | |
| 2858 | /* |
| 2859 | * Currently, to simplify the code, only the spte write-protected |
| 2860 | * by dirty-log can be fast fixed. |
| 2861 | */ |
| 2862 | if (!spte_is_locklessly_modifiable(spte)) |
| 2863 | goto exit; |
| 2864 | |
| 2865 | /* |
Xiao Guangrong | c126d94 | 2014-04-17 17:06:14 +0800 | [diff] [blame] | 2866 | * Do not fix write-permission on the large spte since we only dirty |
| 2867 | * the first page into the dirty-bitmap in fast_pf_fix_direct_spte() |
| 2868 | * that means other pages are missed if its slot is dirty-logged. |
| 2869 | * |
| 2870 | * Instead, we let the slow page fault path create a normal spte to |
| 2871 | * fix the access. |
| 2872 | * |
| 2873 | * See the comments in kvm_arch_commit_memory_region(). |
| 2874 | */ |
| 2875 | if (sp->role.level > PT_PAGE_TABLE_LEVEL) |
| 2876 | goto exit; |
| 2877 | |
| 2878 | /* |
Xiao Guangrong | c7ba5b4 | 2012-06-20 15:59:18 +0800 | [diff] [blame] | 2879 | * Currently, fast page fault only works for direct mapping since |
| 2880 | * the gfn is not stable for indirect shadow page. |
| 2881 | * See Documentation/virtual/kvm/locking.txt to get more detail. |
| 2882 | */ |
Xiao Guangrong | 92a476c | 2014-04-17 17:06:13 +0800 | [diff] [blame] | 2883 | ret = fast_pf_fix_direct_spte(vcpu, sp, iterator.sptep, spte); |
Xiao Guangrong | c7ba5b4 | 2012-06-20 15:59:18 +0800 | [diff] [blame] | 2884 | exit: |
Xiao Guangrong | a72faf2 | 2012-06-20 15:59:41 +0800 | [diff] [blame] | 2885 | trace_fast_page_fault(vcpu, gva, error_code, iterator.sptep, |
| 2886 | spte, ret); |
Xiao Guangrong | c7ba5b4 | 2012-06-20 15:59:18 +0800 | [diff] [blame] | 2887 | walk_shadow_page_lockless_end(vcpu); |
| 2888 | |
| 2889 | return ret; |
| 2890 | } |
| 2891 | |
Xiao Guangrong | 78b2c54 | 2010-12-07 10:48:06 +0800 | [diff] [blame] | 2892 | static bool try_async_pf(struct kvm_vcpu *vcpu, bool prefault, gfn_t gfn, |
Xiao Guangrong | 060c2ab | 2010-11-12 14:49:11 +0800 | [diff] [blame] | 2893 | gva_t gva, pfn_t *pfn, bool write, bool *writable); |
Takuya Yoshikawa | 450e0b4 | 2013-03-29 14:05:26 +0900 | [diff] [blame] | 2894 | static void make_mmu_pages_available(struct kvm_vcpu *vcpu); |
Xiao Guangrong | 060c2ab | 2010-11-12 14:49:11 +0800 | [diff] [blame] | 2895 | |
Xiao Guangrong | c7ba5b4 | 2012-06-20 15:59:18 +0800 | [diff] [blame] | 2896 | static int nonpaging_map(struct kvm_vcpu *vcpu, gva_t v, u32 error_code, |
| 2897 | gfn_t gfn, bool prefault) |
Marcelo Tosatti | 10589a4 | 2007-12-20 19:18:22 -0500 | [diff] [blame] | 2898 | { |
| 2899 | int r; |
Joerg Roedel | 852e3c1 | 2009-07-27 16:30:44 +0200 | [diff] [blame] | 2900 | int level; |
Andrea Arcangeli | 936a5fe | 2011-01-13 15:46:48 -0800 | [diff] [blame] | 2901 | int force_pt_level; |
Anthony Liguori | 35149e2 | 2008-04-02 14:46:56 -0500 | [diff] [blame] | 2902 | pfn_t pfn; |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 2903 | unsigned long mmu_seq; |
Xiao Guangrong | c7ba5b4 | 2012-06-20 15:59:18 +0800 | [diff] [blame] | 2904 | bool map_writable, write = error_code & PFERR_WRITE_MASK; |
Marcelo Tosatti | aaee2c9 | 2007-12-20 19:18:26 -0500 | [diff] [blame] | 2905 | |
Andrea Arcangeli | 936a5fe | 2011-01-13 15:46:48 -0800 | [diff] [blame] | 2906 | force_pt_level = mapping_level_dirty_bitmap(vcpu, gfn); |
| 2907 | if (likely(!force_pt_level)) { |
| 2908 | level = mapping_level(vcpu, gfn); |
| 2909 | /* |
| 2910 | * This path builds a PAE pagetable - so we can map |
| 2911 | * 2mb pages at maximum. Therefore check if the level |
| 2912 | * is larger than that. |
| 2913 | */ |
| 2914 | if (level > PT_DIRECTORY_LEVEL) |
| 2915 | level = PT_DIRECTORY_LEVEL; |
Joerg Roedel | 852e3c1 | 2009-07-27 16:30:44 +0200 | [diff] [blame] | 2916 | |
Andrea Arcangeli | 936a5fe | 2011-01-13 15:46:48 -0800 | [diff] [blame] | 2917 | gfn &= ~(KVM_PAGES_PER_HPAGE(level) - 1); |
| 2918 | } else |
| 2919 | level = PT_PAGE_TABLE_LEVEL; |
Marcelo Tosatti | 05da455 | 2008-02-23 11:44:30 -0300 | [diff] [blame] | 2920 | |
Xiao Guangrong | c7ba5b4 | 2012-06-20 15:59:18 +0800 | [diff] [blame] | 2921 | if (fast_page_fault(vcpu, v, level, error_code)) |
| 2922 | return 0; |
| 2923 | |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 2924 | mmu_seq = vcpu->kvm->mmu_notifier_seq; |
Marcelo Tosatti | 4c2155c | 2008-09-16 20:54:47 -0300 | [diff] [blame] | 2925 | smp_rmb(); |
Xiao Guangrong | 060c2ab | 2010-11-12 14:49:11 +0800 | [diff] [blame] | 2926 | |
Xiao Guangrong | 78b2c54 | 2010-12-07 10:48:06 +0800 | [diff] [blame] | 2927 | if (try_async_pf(vcpu, prefault, gfn, v, &pfn, write, &map_writable)) |
Xiao Guangrong | 060c2ab | 2010-11-12 14:49:11 +0800 | [diff] [blame] | 2928 | return 0; |
Marcelo Tosatti | aaee2c9 | 2007-12-20 19:18:26 -0500 | [diff] [blame] | 2929 | |
Xiao Guangrong | d7c5520 | 2011-07-12 03:29:38 +0800 | [diff] [blame] | 2930 | if (handle_abnormal_pfn(vcpu, v, gfn, pfn, ACC_ALL, &r)) |
| 2931 | return r; |
Avi Kivity | d196e34 | 2008-01-24 11:44:11 +0200 | [diff] [blame] | 2932 | |
Marcelo Tosatti | aaee2c9 | 2007-12-20 19:18:26 -0500 | [diff] [blame] | 2933 | spin_lock(&vcpu->kvm->mmu_lock); |
Christoffer Dall | 8ca40a7 | 2012-10-14 23:10:18 -0400 | [diff] [blame] | 2934 | if (mmu_notifier_retry(vcpu->kvm, mmu_seq)) |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 2935 | goto out_unlock; |
Takuya Yoshikawa | 450e0b4 | 2013-03-29 14:05:26 +0900 | [diff] [blame] | 2936 | make_mmu_pages_available(vcpu); |
Andrea Arcangeli | 936a5fe | 2011-01-13 15:46:48 -0800 | [diff] [blame] | 2937 | if (likely(!force_pt_level)) |
| 2938 | transparent_hugepage_adjust(vcpu, &gfn, &pfn, &level); |
Xiao Guangrong | 2ec4739 | 2010-12-07 10:34:42 +0800 | [diff] [blame] | 2939 | r = __direct_map(vcpu, v, write, map_writable, level, gfn, pfn, |
| 2940 | prefault); |
Marcelo Tosatti | aaee2c9 | 2007-12-20 19:18:26 -0500 | [diff] [blame] | 2941 | spin_unlock(&vcpu->kvm->mmu_lock); |
| 2942 | |
Marcelo Tosatti | aaee2c9 | 2007-12-20 19:18:26 -0500 | [diff] [blame] | 2943 | |
Marcelo Tosatti | 10589a4 | 2007-12-20 19:18:22 -0500 | [diff] [blame] | 2944 | return r; |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 2945 | |
| 2946 | out_unlock: |
| 2947 | spin_unlock(&vcpu->kvm->mmu_lock); |
| 2948 | kvm_release_pfn_clean(pfn); |
| 2949 | return 0; |
Marcelo Tosatti | 10589a4 | 2007-12-20 19:18:22 -0500 | [diff] [blame] | 2950 | } |
| 2951 | |
| 2952 | |
Avi Kivity | 17ac10a | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 2953 | static void mmu_free_roots(struct kvm_vcpu *vcpu) |
| 2954 | { |
| 2955 | int i; |
Avi Kivity | 4db3531 | 2007-11-21 15:28:32 +0200 | [diff] [blame] | 2956 | struct kvm_mmu_page *sp; |
Xiao Guangrong | d98ba05 | 2010-06-04 21:55:29 +0800 | [diff] [blame] | 2957 | LIST_HEAD(invalid_list); |
Avi Kivity | 17ac10a | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 2958 | |
Zhang Xiantao | ad312c7 | 2007-12-13 23:50:52 +0800 | [diff] [blame] | 2959 | if (!VALID_PAGE(vcpu->arch.mmu.root_hpa)) |
Avi Kivity | 7b53aa5 | 2007-06-05 12:17:03 +0300 | [diff] [blame] | 2960 | return; |
Gleb Natapov | 35af577 | 2013-05-16 11:55:51 +0300 | [diff] [blame] | 2961 | |
Joerg Roedel | 81407ca | 2010-09-10 17:31:00 +0200 | [diff] [blame] | 2962 | if (vcpu->arch.mmu.shadow_root_level == PT64_ROOT_LEVEL && |
| 2963 | (vcpu->arch.mmu.root_level == PT64_ROOT_LEVEL || |
| 2964 | vcpu->arch.mmu.direct_map)) { |
Zhang Xiantao | ad312c7 | 2007-12-13 23:50:52 +0800 | [diff] [blame] | 2965 | hpa_t root = vcpu->arch.mmu.root_hpa; |
Avi Kivity | 17ac10a | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 2966 | |
Gleb Natapov | 35af577 | 2013-05-16 11:55:51 +0300 | [diff] [blame] | 2967 | spin_lock(&vcpu->kvm->mmu_lock); |
Avi Kivity | 4db3531 | 2007-11-21 15:28:32 +0200 | [diff] [blame] | 2968 | sp = page_header(root); |
| 2969 | --sp->root_count; |
Xiao Guangrong | d98ba05 | 2010-06-04 21:55:29 +0800 | [diff] [blame] | 2970 | if (!sp->root_count && sp->role.invalid) { |
| 2971 | kvm_mmu_prepare_zap_page(vcpu->kvm, sp, &invalid_list); |
| 2972 | kvm_mmu_commit_zap_page(vcpu->kvm, &invalid_list); |
| 2973 | } |
Marcelo Tosatti | aaee2c9 | 2007-12-20 19:18:26 -0500 | [diff] [blame] | 2974 | spin_unlock(&vcpu->kvm->mmu_lock); |
Gleb Natapov | 35af577 | 2013-05-16 11:55:51 +0300 | [diff] [blame] | 2975 | vcpu->arch.mmu.root_hpa = INVALID_PAGE; |
Avi Kivity | 17ac10a | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 2976 | return; |
| 2977 | } |
Gleb Natapov | 35af577 | 2013-05-16 11:55:51 +0300 | [diff] [blame] | 2978 | |
| 2979 | spin_lock(&vcpu->kvm->mmu_lock); |
Avi Kivity | 17ac10a | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 2980 | for (i = 0; i < 4; ++i) { |
Zhang Xiantao | ad312c7 | 2007-12-13 23:50:52 +0800 | [diff] [blame] | 2981 | hpa_t root = vcpu->arch.mmu.pae_root[i]; |
Avi Kivity | 17ac10a | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 2982 | |
Avi Kivity | 417726a | 2007-04-12 17:35:58 +0300 | [diff] [blame] | 2983 | if (root) { |
Avi Kivity | 417726a | 2007-04-12 17:35:58 +0300 | [diff] [blame] | 2984 | root &= PT64_BASE_ADDR_MASK; |
Avi Kivity | 4db3531 | 2007-11-21 15:28:32 +0200 | [diff] [blame] | 2985 | sp = page_header(root); |
| 2986 | --sp->root_count; |
Marcelo Tosatti | 2e53d63 | 2008-02-20 14:47:24 -0500 | [diff] [blame] | 2987 | if (!sp->root_count && sp->role.invalid) |
Xiao Guangrong | d98ba05 | 2010-06-04 21:55:29 +0800 | [diff] [blame] | 2988 | kvm_mmu_prepare_zap_page(vcpu->kvm, sp, |
| 2989 | &invalid_list); |
Avi Kivity | 417726a | 2007-04-12 17:35:58 +0300 | [diff] [blame] | 2990 | } |
Zhang Xiantao | ad312c7 | 2007-12-13 23:50:52 +0800 | [diff] [blame] | 2991 | vcpu->arch.mmu.pae_root[i] = INVALID_PAGE; |
Avi Kivity | 17ac10a | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 2992 | } |
Xiao Guangrong | d98ba05 | 2010-06-04 21:55:29 +0800 | [diff] [blame] | 2993 | kvm_mmu_commit_zap_page(vcpu->kvm, &invalid_list); |
Marcelo Tosatti | aaee2c9 | 2007-12-20 19:18:26 -0500 | [diff] [blame] | 2994 | spin_unlock(&vcpu->kvm->mmu_lock); |
Zhang Xiantao | ad312c7 | 2007-12-13 23:50:52 +0800 | [diff] [blame] | 2995 | vcpu->arch.mmu.root_hpa = INVALID_PAGE; |
Avi Kivity | 17ac10a | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 2996 | } |
| 2997 | |
Marcelo Tosatti | 8986ecc | 2009-05-12 18:55:45 -0300 | [diff] [blame] | 2998 | static int mmu_check_root(struct kvm_vcpu *vcpu, gfn_t root_gfn) |
| 2999 | { |
| 3000 | int ret = 0; |
| 3001 | |
| 3002 | if (!kvm_is_visible_gfn(vcpu->kvm, root_gfn)) { |
Avi Kivity | a8eeb04 | 2010-05-10 12:34:53 +0300 | [diff] [blame] | 3003 | kvm_make_request(KVM_REQ_TRIPLE_FAULT, vcpu); |
Marcelo Tosatti | 8986ecc | 2009-05-12 18:55:45 -0300 | [diff] [blame] | 3004 | ret = 1; |
| 3005 | } |
| 3006 | |
| 3007 | return ret; |
| 3008 | } |
| 3009 | |
Joerg Roedel | 651dd37 | 2010-09-10 17:30:59 +0200 | [diff] [blame] | 3010 | static int mmu_alloc_direct_roots(struct kvm_vcpu *vcpu) |
| 3011 | { |
| 3012 | struct kvm_mmu_page *sp; |
Avi Kivity | 7ebaf15 | 2010-10-03 18:51:39 +0200 | [diff] [blame] | 3013 | unsigned i; |
Joerg Roedel | 651dd37 | 2010-09-10 17:30:59 +0200 | [diff] [blame] | 3014 | |
| 3015 | if (vcpu->arch.mmu.shadow_root_level == PT64_ROOT_LEVEL) { |
| 3016 | spin_lock(&vcpu->kvm->mmu_lock); |
Takuya Yoshikawa | 450e0b4 | 2013-03-29 14:05:26 +0900 | [diff] [blame] | 3017 | make_mmu_pages_available(vcpu); |
Joerg Roedel | 651dd37 | 2010-09-10 17:30:59 +0200 | [diff] [blame] | 3018 | sp = kvm_mmu_get_page(vcpu, 0, 0, PT64_ROOT_LEVEL, |
| 3019 | 1, ACC_ALL, NULL); |
| 3020 | ++sp->root_count; |
| 3021 | spin_unlock(&vcpu->kvm->mmu_lock); |
| 3022 | vcpu->arch.mmu.root_hpa = __pa(sp->spt); |
| 3023 | } else if (vcpu->arch.mmu.shadow_root_level == PT32E_ROOT_LEVEL) { |
| 3024 | for (i = 0; i < 4; ++i) { |
| 3025 | hpa_t root = vcpu->arch.mmu.pae_root[i]; |
| 3026 | |
| 3027 | ASSERT(!VALID_PAGE(root)); |
| 3028 | spin_lock(&vcpu->kvm->mmu_lock); |
Takuya Yoshikawa | 450e0b4 | 2013-03-29 14:05:26 +0900 | [diff] [blame] | 3029 | make_mmu_pages_available(vcpu); |
Avi Kivity | 649497d | 2010-12-28 12:09:07 +0200 | [diff] [blame] | 3030 | sp = kvm_mmu_get_page(vcpu, i << (30 - PAGE_SHIFT), |
| 3031 | i << 30, |
Joerg Roedel | 651dd37 | 2010-09-10 17:30:59 +0200 | [diff] [blame] | 3032 | PT32_ROOT_LEVEL, 1, ACC_ALL, |
| 3033 | NULL); |
| 3034 | root = __pa(sp->spt); |
| 3035 | ++sp->root_count; |
| 3036 | spin_unlock(&vcpu->kvm->mmu_lock); |
| 3037 | vcpu->arch.mmu.pae_root[i] = root | PT_PRESENT_MASK; |
Joerg Roedel | 651dd37 | 2010-09-10 17:30:59 +0200 | [diff] [blame] | 3038 | } |
Xiao Guangrong | 6292757 | 2010-09-27 18:02:12 +0800 | [diff] [blame] | 3039 | vcpu->arch.mmu.root_hpa = __pa(vcpu->arch.mmu.pae_root); |
Joerg Roedel | 651dd37 | 2010-09-10 17:30:59 +0200 | [diff] [blame] | 3040 | } else |
| 3041 | BUG(); |
| 3042 | |
| 3043 | return 0; |
| 3044 | } |
| 3045 | |
| 3046 | static int mmu_alloc_shadow_roots(struct kvm_vcpu *vcpu) |
Avi Kivity | 17ac10a | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 3047 | { |
Avi Kivity | 4db3531 | 2007-11-21 15:28:32 +0200 | [diff] [blame] | 3048 | struct kvm_mmu_page *sp; |
Joerg Roedel | 81407ca | 2010-09-10 17:31:00 +0200 | [diff] [blame] | 3049 | u64 pdptr, pm_mask; |
| 3050 | gfn_t root_gfn; |
| 3051 | int i; |
Avi Kivity | 3bb65a2 | 2007-01-05 16:36:51 -0800 | [diff] [blame] | 3052 | |
Joerg Roedel | 5777ed3 | 2010-09-10 17:30:42 +0200 | [diff] [blame] | 3053 | root_gfn = vcpu->arch.mmu.get_cr3(vcpu) >> PAGE_SHIFT; |
Avi Kivity | 17ac10a | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 3054 | |
Joerg Roedel | 651dd37 | 2010-09-10 17:30:59 +0200 | [diff] [blame] | 3055 | if (mmu_check_root(vcpu, root_gfn)) |
| 3056 | return 1; |
| 3057 | |
| 3058 | /* |
| 3059 | * Do we shadow a long mode page table? If so we need to |
| 3060 | * write-protect the guests page table root. |
| 3061 | */ |
| 3062 | if (vcpu->arch.mmu.root_level == PT64_ROOT_LEVEL) { |
Zhang Xiantao | ad312c7 | 2007-12-13 23:50:52 +0800 | [diff] [blame] | 3063 | hpa_t root = vcpu->arch.mmu.root_hpa; |
Avi Kivity | 17ac10a | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 3064 | |
| 3065 | ASSERT(!VALID_PAGE(root)); |
Joerg Roedel | 651dd37 | 2010-09-10 17:30:59 +0200 | [diff] [blame] | 3066 | |
Avi Kivity | 8facbbf | 2010-05-04 12:58:32 +0300 | [diff] [blame] | 3067 | spin_lock(&vcpu->kvm->mmu_lock); |
Takuya Yoshikawa | 450e0b4 | 2013-03-29 14:05:26 +0900 | [diff] [blame] | 3068 | make_mmu_pages_available(vcpu); |
Joerg Roedel | 651dd37 | 2010-09-10 17:30:59 +0200 | [diff] [blame] | 3069 | sp = kvm_mmu_get_page(vcpu, root_gfn, 0, PT64_ROOT_LEVEL, |
| 3070 | 0, ACC_ALL, NULL); |
Avi Kivity | 4db3531 | 2007-11-21 15:28:32 +0200 | [diff] [blame] | 3071 | root = __pa(sp->spt); |
| 3072 | ++sp->root_count; |
Avi Kivity | 8facbbf | 2010-05-04 12:58:32 +0300 | [diff] [blame] | 3073 | spin_unlock(&vcpu->kvm->mmu_lock); |
Zhang Xiantao | ad312c7 | 2007-12-13 23:50:52 +0800 | [diff] [blame] | 3074 | vcpu->arch.mmu.root_hpa = root; |
Marcelo Tosatti | 8986ecc | 2009-05-12 18:55:45 -0300 | [diff] [blame] | 3075 | return 0; |
Avi Kivity | 17ac10a | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 3076 | } |
Joerg Roedel | f87f928 | 2010-09-02 17:29:45 +0200 | [diff] [blame] | 3077 | |
Joerg Roedel | 651dd37 | 2010-09-10 17:30:59 +0200 | [diff] [blame] | 3078 | /* |
| 3079 | * We shadow a 32 bit page table. This may be a legacy 2-level |
Joerg Roedel | 81407ca | 2010-09-10 17:31:00 +0200 | [diff] [blame] | 3080 | * or a PAE 3-level page table. In either case we need to be aware that |
| 3081 | * the shadow page table may be a PAE or a long mode page table. |
Joerg Roedel | 651dd37 | 2010-09-10 17:30:59 +0200 | [diff] [blame] | 3082 | */ |
Joerg Roedel | 81407ca | 2010-09-10 17:31:00 +0200 | [diff] [blame] | 3083 | pm_mask = PT_PRESENT_MASK; |
| 3084 | if (vcpu->arch.mmu.shadow_root_level == PT64_ROOT_LEVEL) |
| 3085 | pm_mask |= PT_ACCESSED_MASK | PT_WRITABLE_MASK | PT_USER_MASK; |
| 3086 | |
Avi Kivity | 17ac10a | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 3087 | for (i = 0; i < 4; ++i) { |
Zhang Xiantao | ad312c7 | 2007-12-13 23:50:52 +0800 | [diff] [blame] | 3088 | hpa_t root = vcpu->arch.mmu.pae_root[i]; |
Avi Kivity | 17ac10a | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 3089 | |
| 3090 | ASSERT(!VALID_PAGE(root)); |
Zhang Xiantao | ad312c7 | 2007-12-13 23:50:52 +0800 | [diff] [blame] | 3091 | if (vcpu->arch.mmu.root_level == PT32E_ROOT_LEVEL) { |
Avi Kivity | e4e517b | 2011-07-28 11:36:17 +0300 | [diff] [blame] | 3092 | pdptr = vcpu->arch.mmu.get_pdptr(vcpu, i); |
Avi Kivity | 43a3795 | 2009-06-10 14:12:05 +0300 | [diff] [blame] | 3093 | if (!is_present_gpte(pdptr)) { |
Zhang Xiantao | ad312c7 | 2007-12-13 23:50:52 +0800 | [diff] [blame] | 3094 | vcpu->arch.mmu.pae_root[i] = 0; |
Avi Kivity | 417726a | 2007-04-12 17:35:58 +0300 | [diff] [blame] | 3095 | continue; |
| 3096 | } |
Avi Kivity | 6de4f3a | 2009-05-31 22:58:47 +0300 | [diff] [blame] | 3097 | root_gfn = pdptr >> PAGE_SHIFT; |
Joerg Roedel | f87f928 | 2010-09-02 17:29:45 +0200 | [diff] [blame] | 3098 | if (mmu_check_root(vcpu, root_gfn)) |
| 3099 | return 1; |
Eric Northup | 5a7388c | 2010-04-26 17:00:05 -0700 | [diff] [blame] | 3100 | } |
Avi Kivity | 8facbbf | 2010-05-04 12:58:32 +0300 | [diff] [blame] | 3101 | spin_lock(&vcpu->kvm->mmu_lock); |
Takuya Yoshikawa | 450e0b4 | 2013-03-29 14:05:26 +0900 | [diff] [blame] | 3102 | make_mmu_pages_available(vcpu); |
Avi Kivity | 4db3531 | 2007-11-21 15:28:32 +0200 | [diff] [blame] | 3103 | sp = kvm_mmu_get_page(vcpu, root_gfn, i << 30, |
Joerg Roedel | 651dd37 | 2010-09-10 17:30:59 +0200 | [diff] [blame] | 3104 | PT32_ROOT_LEVEL, 0, |
Avi Kivity | f7d9c7b | 2008-02-26 22:12:10 +0200 | [diff] [blame] | 3105 | ACC_ALL, NULL); |
Avi Kivity | 4db3531 | 2007-11-21 15:28:32 +0200 | [diff] [blame] | 3106 | root = __pa(sp->spt); |
| 3107 | ++sp->root_count; |
Avi Kivity | 8facbbf | 2010-05-04 12:58:32 +0300 | [diff] [blame] | 3108 | spin_unlock(&vcpu->kvm->mmu_lock); |
| 3109 | |
Joerg Roedel | 81407ca | 2010-09-10 17:31:00 +0200 | [diff] [blame] | 3110 | vcpu->arch.mmu.pae_root[i] = root | pm_mask; |
Avi Kivity | 17ac10a | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 3111 | } |
Xiao Guangrong | 6292757 | 2010-09-27 18:02:12 +0800 | [diff] [blame] | 3112 | vcpu->arch.mmu.root_hpa = __pa(vcpu->arch.mmu.pae_root); |
Joerg Roedel | 81407ca | 2010-09-10 17:31:00 +0200 | [diff] [blame] | 3113 | |
| 3114 | /* |
| 3115 | * If we shadow a 32 bit page table with a long mode page |
| 3116 | * table we enter this path. |
| 3117 | */ |
| 3118 | if (vcpu->arch.mmu.shadow_root_level == PT64_ROOT_LEVEL) { |
| 3119 | if (vcpu->arch.mmu.lm_root == NULL) { |
| 3120 | /* |
| 3121 | * The additional page necessary for this is only |
| 3122 | * allocated on demand. |
| 3123 | */ |
| 3124 | |
| 3125 | u64 *lm_root; |
| 3126 | |
| 3127 | lm_root = (void*)get_zeroed_page(GFP_KERNEL); |
| 3128 | if (lm_root == NULL) |
| 3129 | return 1; |
| 3130 | |
| 3131 | lm_root[0] = __pa(vcpu->arch.mmu.pae_root) | pm_mask; |
| 3132 | |
| 3133 | vcpu->arch.mmu.lm_root = lm_root; |
| 3134 | } |
| 3135 | |
| 3136 | vcpu->arch.mmu.root_hpa = __pa(vcpu->arch.mmu.lm_root); |
| 3137 | } |
| 3138 | |
Marcelo Tosatti | 8986ecc | 2009-05-12 18:55:45 -0300 | [diff] [blame] | 3139 | return 0; |
Avi Kivity | 17ac10a | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 3140 | } |
| 3141 | |
Joerg Roedel | 651dd37 | 2010-09-10 17:30:59 +0200 | [diff] [blame] | 3142 | static int mmu_alloc_roots(struct kvm_vcpu *vcpu) |
| 3143 | { |
| 3144 | if (vcpu->arch.mmu.direct_map) |
| 3145 | return mmu_alloc_direct_roots(vcpu); |
| 3146 | else |
| 3147 | return mmu_alloc_shadow_roots(vcpu); |
| 3148 | } |
| 3149 | |
Marcelo Tosatti | 0ba73cd | 2008-09-23 13:18:34 -0300 | [diff] [blame] | 3150 | static void mmu_sync_roots(struct kvm_vcpu *vcpu) |
| 3151 | { |
| 3152 | int i; |
| 3153 | struct kvm_mmu_page *sp; |
| 3154 | |
Joerg Roedel | 81407ca | 2010-09-10 17:31:00 +0200 | [diff] [blame] | 3155 | if (vcpu->arch.mmu.direct_map) |
| 3156 | return; |
| 3157 | |
Marcelo Tosatti | 0ba73cd | 2008-09-23 13:18:34 -0300 | [diff] [blame] | 3158 | if (!VALID_PAGE(vcpu->arch.mmu.root_hpa)) |
| 3159 | return; |
Xiao Guangrong | 6903074 | 2010-09-27 18:09:29 +0800 | [diff] [blame] | 3160 | |
Xiao Guangrong | bebb106 | 2011-07-12 03:23:20 +0800 | [diff] [blame] | 3161 | vcpu_clear_mmio_info(vcpu, ~0ul); |
Xiao Guangrong | 0375f7f | 2011-11-28 20:41:00 +0800 | [diff] [blame] | 3162 | kvm_mmu_audit(vcpu, AUDIT_PRE_SYNC); |
Joerg Roedel | 81407ca | 2010-09-10 17:31:00 +0200 | [diff] [blame] | 3163 | if (vcpu->arch.mmu.root_level == PT64_ROOT_LEVEL) { |
Marcelo Tosatti | 0ba73cd | 2008-09-23 13:18:34 -0300 | [diff] [blame] | 3164 | hpa_t root = vcpu->arch.mmu.root_hpa; |
| 3165 | sp = page_header(root); |
| 3166 | mmu_sync_children(vcpu, sp); |
Xiao Guangrong | 0375f7f | 2011-11-28 20:41:00 +0800 | [diff] [blame] | 3167 | kvm_mmu_audit(vcpu, AUDIT_POST_SYNC); |
Marcelo Tosatti | 0ba73cd | 2008-09-23 13:18:34 -0300 | [diff] [blame] | 3168 | return; |
| 3169 | } |
| 3170 | for (i = 0; i < 4; ++i) { |
| 3171 | hpa_t root = vcpu->arch.mmu.pae_root[i]; |
| 3172 | |
Marcelo Tosatti | 8986ecc | 2009-05-12 18:55:45 -0300 | [diff] [blame] | 3173 | if (root && VALID_PAGE(root)) { |
Marcelo Tosatti | 0ba73cd | 2008-09-23 13:18:34 -0300 | [diff] [blame] | 3174 | root &= PT64_BASE_ADDR_MASK; |
| 3175 | sp = page_header(root); |
| 3176 | mmu_sync_children(vcpu, sp); |
| 3177 | } |
| 3178 | } |
Xiao Guangrong | 0375f7f | 2011-11-28 20:41:00 +0800 | [diff] [blame] | 3179 | kvm_mmu_audit(vcpu, AUDIT_POST_SYNC); |
Marcelo Tosatti | 0ba73cd | 2008-09-23 13:18:34 -0300 | [diff] [blame] | 3180 | } |
| 3181 | |
| 3182 | void kvm_mmu_sync_roots(struct kvm_vcpu *vcpu) |
| 3183 | { |
| 3184 | spin_lock(&vcpu->kvm->mmu_lock); |
| 3185 | mmu_sync_roots(vcpu); |
| 3186 | spin_unlock(&vcpu->kvm->mmu_lock); |
| 3187 | } |
Nadav Har'El | bfd0a56 | 2013-08-05 11:07:17 +0300 | [diff] [blame] | 3188 | EXPORT_SYMBOL_GPL(kvm_mmu_sync_roots); |
Marcelo Tosatti | 0ba73cd | 2008-09-23 13:18:34 -0300 | [diff] [blame] | 3189 | |
Gleb Natapov | 1871c60 | 2010-02-10 14:21:32 +0200 | [diff] [blame] | 3190 | static gpa_t nonpaging_gva_to_gpa(struct kvm_vcpu *vcpu, gva_t vaddr, |
Avi Kivity | ab9ae31 | 2010-11-22 17:53:26 +0200 | [diff] [blame] | 3191 | u32 access, struct x86_exception *exception) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3192 | { |
Avi Kivity | ab9ae31 | 2010-11-22 17:53:26 +0200 | [diff] [blame] | 3193 | if (exception) |
| 3194 | exception->error_code = 0; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3195 | return vaddr; |
| 3196 | } |
| 3197 | |
Joerg Roedel | 6539e73 | 2010-09-10 17:30:50 +0200 | [diff] [blame] | 3198 | static gpa_t nonpaging_gva_to_gpa_nested(struct kvm_vcpu *vcpu, gva_t vaddr, |
Avi Kivity | ab9ae31 | 2010-11-22 17:53:26 +0200 | [diff] [blame] | 3199 | u32 access, |
| 3200 | struct x86_exception *exception) |
Joerg Roedel | 6539e73 | 2010-09-10 17:30:50 +0200 | [diff] [blame] | 3201 | { |
Avi Kivity | ab9ae31 | 2010-11-22 17:53:26 +0200 | [diff] [blame] | 3202 | if (exception) |
| 3203 | exception->error_code = 0; |
Joerg Roedel | 6539e73 | 2010-09-10 17:30:50 +0200 | [diff] [blame] | 3204 | return vcpu->arch.nested_mmu.translate_gpa(vcpu, vaddr, access); |
| 3205 | } |
| 3206 | |
Xiao Guangrong | ce88dec | 2011-07-12 03:33:44 +0800 | [diff] [blame] | 3207 | static bool quickly_check_mmio_pf(struct kvm_vcpu *vcpu, u64 addr, bool direct) |
| 3208 | { |
| 3209 | if (direct) |
| 3210 | return vcpu_match_mmio_gpa(vcpu, addr); |
| 3211 | |
| 3212 | return vcpu_match_mmio_gva(vcpu, addr); |
| 3213 | } |
| 3214 | |
| 3215 | |
| 3216 | /* |
| 3217 | * On direct hosts, the last spte is only allows two states |
| 3218 | * for mmio page fault: |
| 3219 | * - It is the mmio spte |
| 3220 | * - It is zapped or it is being zapped. |
| 3221 | * |
| 3222 | * This function completely checks the spte when the last spte |
| 3223 | * is not the mmio spte. |
| 3224 | */ |
| 3225 | static bool check_direct_spte_mmio_pf(u64 spte) |
| 3226 | { |
| 3227 | return __check_direct_spte_mmio_pf(spte); |
| 3228 | } |
| 3229 | |
| 3230 | static u64 walk_shadow_page_get_mmio_spte(struct kvm_vcpu *vcpu, u64 addr) |
| 3231 | { |
| 3232 | struct kvm_shadow_walk_iterator iterator; |
| 3233 | u64 spte = 0ull; |
| 3234 | |
Marcelo Tosatti | 37f6a4e | 2014-01-03 17:09:32 -0200 | [diff] [blame] | 3235 | if (!VALID_PAGE(vcpu->arch.mmu.root_hpa)) |
| 3236 | return spte; |
| 3237 | |
Xiao Guangrong | ce88dec | 2011-07-12 03:33:44 +0800 | [diff] [blame] | 3238 | walk_shadow_page_lockless_begin(vcpu); |
| 3239 | for_each_shadow_entry_lockless(vcpu, addr, iterator, spte) |
| 3240 | if (!is_shadow_present_pte(spte)) |
| 3241 | break; |
| 3242 | walk_shadow_page_lockless_end(vcpu); |
| 3243 | |
| 3244 | return spte; |
| 3245 | } |
| 3246 | |
Xiao Guangrong | ce88dec | 2011-07-12 03:33:44 +0800 | [diff] [blame] | 3247 | int handle_mmio_page_fault_common(struct kvm_vcpu *vcpu, u64 addr, bool direct) |
| 3248 | { |
| 3249 | u64 spte; |
| 3250 | |
| 3251 | if (quickly_check_mmio_pf(vcpu, addr, direct)) |
Xiao Guangrong | b37fbea | 2013-06-07 16:51:25 +0800 | [diff] [blame] | 3252 | return RET_MMIO_PF_EMULATE; |
Xiao Guangrong | ce88dec | 2011-07-12 03:33:44 +0800 | [diff] [blame] | 3253 | |
| 3254 | spte = walk_shadow_page_get_mmio_spte(vcpu, addr); |
| 3255 | |
| 3256 | if (is_mmio_spte(spte)) { |
| 3257 | gfn_t gfn = get_mmio_spte_gfn(spte); |
| 3258 | unsigned access = get_mmio_spte_access(spte); |
| 3259 | |
Xiao Guangrong | f8f5594 | 2013-06-07 16:51:26 +0800 | [diff] [blame] | 3260 | if (!check_mmio_spte(vcpu->kvm, spte)) |
| 3261 | return RET_MMIO_PF_INVALID; |
| 3262 | |
Xiao Guangrong | ce88dec | 2011-07-12 03:33:44 +0800 | [diff] [blame] | 3263 | if (direct) |
| 3264 | addr = 0; |
Xiao Guangrong | 4f02264 | 2011-07-12 03:34:24 +0800 | [diff] [blame] | 3265 | |
| 3266 | trace_handle_mmio_page_fault(addr, gfn, access); |
Xiao Guangrong | ce88dec | 2011-07-12 03:33:44 +0800 | [diff] [blame] | 3267 | vcpu_cache_mmio_info(vcpu, addr, gfn, access); |
Xiao Guangrong | b37fbea | 2013-06-07 16:51:25 +0800 | [diff] [blame] | 3268 | return RET_MMIO_PF_EMULATE; |
Xiao Guangrong | ce88dec | 2011-07-12 03:33:44 +0800 | [diff] [blame] | 3269 | } |
| 3270 | |
| 3271 | /* |
| 3272 | * It's ok if the gva is remapped by other cpus on shadow guest, |
| 3273 | * it's a BUG if the gfn is not a mmio page. |
| 3274 | */ |
| 3275 | if (direct && !check_direct_spte_mmio_pf(spte)) |
Xiao Guangrong | b37fbea | 2013-06-07 16:51:25 +0800 | [diff] [blame] | 3276 | return RET_MMIO_PF_BUG; |
Xiao Guangrong | ce88dec | 2011-07-12 03:33:44 +0800 | [diff] [blame] | 3277 | |
| 3278 | /* |
| 3279 | * If the page table is zapped by other cpus, let CPU fault again on |
| 3280 | * the address. |
| 3281 | */ |
Xiao Guangrong | b37fbea | 2013-06-07 16:51:25 +0800 | [diff] [blame] | 3282 | return RET_MMIO_PF_RETRY; |
Xiao Guangrong | ce88dec | 2011-07-12 03:33:44 +0800 | [diff] [blame] | 3283 | } |
| 3284 | EXPORT_SYMBOL_GPL(handle_mmio_page_fault_common); |
| 3285 | |
| 3286 | static int handle_mmio_page_fault(struct kvm_vcpu *vcpu, u64 addr, |
| 3287 | u32 error_code, bool direct) |
| 3288 | { |
| 3289 | int ret; |
| 3290 | |
| 3291 | ret = handle_mmio_page_fault_common(vcpu, addr, direct); |
Xiao Guangrong | b37fbea | 2013-06-07 16:51:25 +0800 | [diff] [blame] | 3292 | WARN_ON(ret == RET_MMIO_PF_BUG); |
Xiao Guangrong | ce88dec | 2011-07-12 03:33:44 +0800 | [diff] [blame] | 3293 | return ret; |
| 3294 | } |
| 3295 | |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3296 | static int nonpaging_page_fault(struct kvm_vcpu *vcpu, gva_t gva, |
Xiao Guangrong | 78b2c54 | 2010-12-07 10:48:06 +0800 | [diff] [blame] | 3297 | u32 error_code, bool prefault) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3298 | { |
Avi Kivity | e833240 | 2007-12-09 18:43:00 +0200 | [diff] [blame] | 3299 | gfn_t gfn; |
Avi Kivity | e2dec93 | 2007-01-05 16:36:54 -0800 | [diff] [blame] | 3300 | int r; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3301 | |
Harvey Harrison | b8688d5 | 2008-03-03 12:59:56 -0800 | [diff] [blame] | 3302 | pgprintk("%s: gva %lx error %x\n", __func__, gva, error_code); |
Xiao Guangrong | ce88dec | 2011-07-12 03:33:44 +0800 | [diff] [blame] | 3303 | |
Xiao Guangrong | f8f5594 | 2013-06-07 16:51:26 +0800 | [diff] [blame] | 3304 | if (unlikely(error_code & PFERR_RSVD_MASK)) { |
| 3305 | r = handle_mmio_page_fault(vcpu, gva, error_code, true); |
| 3306 | |
| 3307 | if (likely(r != RET_MMIO_PF_INVALID)) |
| 3308 | return r; |
| 3309 | } |
Xiao Guangrong | ce88dec | 2011-07-12 03:33:44 +0800 | [diff] [blame] | 3310 | |
Avi Kivity | e2dec93 | 2007-01-05 16:36:54 -0800 | [diff] [blame] | 3311 | r = mmu_topup_memory_caches(vcpu); |
| 3312 | if (r) |
| 3313 | return r; |
Avi Kivity | 714b93d | 2007-01-05 16:36:53 -0800 | [diff] [blame] | 3314 | |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3315 | ASSERT(vcpu); |
Zhang Xiantao | ad312c7 | 2007-12-13 23:50:52 +0800 | [diff] [blame] | 3316 | ASSERT(VALID_PAGE(vcpu->arch.mmu.root_hpa)); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3317 | |
Avi Kivity | e833240 | 2007-12-09 18:43:00 +0200 | [diff] [blame] | 3318 | gfn = gva >> PAGE_SHIFT; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3319 | |
Avi Kivity | e833240 | 2007-12-09 18:43:00 +0200 | [diff] [blame] | 3320 | return nonpaging_map(vcpu, gva & PAGE_MASK, |
Xiao Guangrong | c7ba5b4 | 2012-06-20 15:59:18 +0800 | [diff] [blame] | 3321 | error_code, gfn, prefault); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3322 | } |
| 3323 | |
Jan Kiszka | 7e1fbea | 2010-10-20 15:18:02 +0200 | [diff] [blame] | 3324 | static int kvm_arch_setup_async_pf(struct kvm_vcpu *vcpu, gva_t gva, gfn_t gfn) |
Gleb Natapov | af585b9 | 2010-10-14 11:22:46 +0200 | [diff] [blame] | 3325 | { |
| 3326 | struct kvm_arch_async_pf arch; |
Xiao Guangrong | fb67e14 | 2010-12-07 10:35:25 +0800 | [diff] [blame] | 3327 | |
Gleb Natapov | 7c90705 | 2010-10-14 11:22:53 +0200 | [diff] [blame] | 3328 | arch.token = (vcpu->arch.apf.id++ << 12) | vcpu->vcpu_id; |
Gleb Natapov | af585b9 | 2010-10-14 11:22:46 +0200 | [diff] [blame] | 3329 | arch.gfn = gfn; |
Xiao Guangrong | c4806ac | 2010-11-12 14:49:55 +0800 | [diff] [blame] | 3330 | arch.direct_map = vcpu->arch.mmu.direct_map; |
Xiao Guangrong | fb67e14 | 2010-12-07 10:35:25 +0800 | [diff] [blame] | 3331 | arch.cr3 = vcpu->arch.mmu.get_cr3(vcpu); |
Gleb Natapov | af585b9 | 2010-10-14 11:22:46 +0200 | [diff] [blame] | 3332 | |
Dominik Dingel | e0ead41 | 2013-06-06 15:32:37 +0200 | [diff] [blame] | 3333 | return kvm_setup_async_pf(vcpu, gva, gfn_to_hva(vcpu->kvm, gfn), &arch); |
Gleb Natapov | af585b9 | 2010-10-14 11:22:46 +0200 | [diff] [blame] | 3334 | } |
| 3335 | |
| 3336 | static bool can_do_async_pf(struct kvm_vcpu *vcpu) |
| 3337 | { |
| 3338 | if (unlikely(!irqchip_in_kernel(vcpu->kvm) || |
| 3339 | kvm_event_needs_reinjection(vcpu))) |
| 3340 | return false; |
| 3341 | |
| 3342 | return kvm_x86_ops->interrupt_allowed(vcpu); |
| 3343 | } |
| 3344 | |
Xiao Guangrong | 78b2c54 | 2010-12-07 10:48:06 +0800 | [diff] [blame] | 3345 | static bool try_async_pf(struct kvm_vcpu *vcpu, bool prefault, gfn_t gfn, |
Marcelo Tosatti | 612819c | 2010-10-22 14:18:18 -0200 | [diff] [blame] | 3346 | gva_t gva, pfn_t *pfn, bool write, bool *writable) |
Gleb Natapov | af585b9 | 2010-10-14 11:22:46 +0200 | [diff] [blame] | 3347 | { |
| 3348 | bool async; |
| 3349 | |
Marcelo Tosatti | 612819c | 2010-10-22 14:18:18 -0200 | [diff] [blame] | 3350 | *pfn = gfn_to_pfn_async(vcpu->kvm, gfn, &async, write, writable); |
Gleb Natapov | af585b9 | 2010-10-14 11:22:46 +0200 | [diff] [blame] | 3351 | |
| 3352 | if (!async) |
| 3353 | return false; /* *pfn has correct page already */ |
| 3354 | |
Xiao Guangrong | 78b2c54 | 2010-12-07 10:48:06 +0800 | [diff] [blame] | 3355 | if (!prefault && can_do_async_pf(vcpu)) { |
Xiao Guangrong | c9b263d | 2010-11-01 16:58:43 +0800 | [diff] [blame] | 3356 | trace_kvm_try_async_get_page(gva, gfn); |
Gleb Natapov | af585b9 | 2010-10-14 11:22:46 +0200 | [diff] [blame] | 3357 | if (kvm_find_async_pf_gfn(vcpu, gfn)) { |
| 3358 | trace_kvm_async_pf_doublefault(gva, gfn); |
| 3359 | kvm_make_request(KVM_REQ_APF_HALT, vcpu); |
| 3360 | return true; |
| 3361 | } else if (kvm_arch_setup_async_pf(vcpu, gva, gfn)) |
| 3362 | return true; |
| 3363 | } |
| 3364 | |
Marcelo Tosatti | 612819c | 2010-10-22 14:18:18 -0200 | [diff] [blame] | 3365 | *pfn = gfn_to_pfn_prot(vcpu->kvm, gfn, write, writable); |
Gleb Natapov | af585b9 | 2010-10-14 11:22:46 +0200 | [diff] [blame] | 3366 | |
| 3367 | return false; |
| 3368 | } |
| 3369 | |
Gleb Natapov | 56028d0 | 2010-10-17 18:13:42 +0200 | [diff] [blame] | 3370 | static int tdp_page_fault(struct kvm_vcpu *vcpu, gva_t gpa, u32 error_code, |
Xiao Guangrong | 78b2c54 | 2010-12-07 10:48:06 +0800 | [diff] [blame] | 3371 | bool prefault) |
Joerg Roedel | fb72d16 | 2008-02-07 13:47:44 +0100 | [diff] [blame] | 3372 | { |
Anthony Liguori | 35149e2 | 2008-04-02 14:46:56 -0500 | [diff] [blame] | 3373 | pfn_t pfn; |
Joerg Roedel | fb72d16 | 2008-02-07 13:47:44 +0100 | [diff] [blame] | 3374 | int r; |
Joerg Roedel | 852e3c1 | 2009-07-27 16:30:44 +0200 | [diff] [blame] | 3375 | int level; |
Andrea Arcangeli | 936a5fe | 2011-01-13 15:46:48 -0800 | [diff] [blame] | 3376 | int force_pt_level; |
Marcelo Tosatti | 05da455 | 2008-02-23 11:44:30 -0300 | [diff] [blame] | 3377 | gfn_t gfn = gpa >> PAGE_SHIFT; |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 3378 | unsigned long mmu_seq; |
Marcelo Tosatti | 612819c | 2010-10-22 14:18:18 -0200 | [diff] [blame] | 3379 | int write = error_code & PFERR_WRITE_MASK; |
| 3380 | bool map_writable; |
Joerg Roedel | fb72d16 | 2008-02-07 13:47:44 +0100 | [diff] [blame] | 3381 | |
| 3382 | ASSERT(vcpu); |
| 3383 | ASSERT(VALID_PAGE(vcpu->arch.mmu.root_hpa)); |
| 3384 | |
Xiao Guangrong | f8f5594 | 2013-06-07 16:51:26 +0800 | [diff] [blame] | 3385 | if (unlikely(error_code & PFERR_RSVD_MASK)) { |
| 3386 | r = handle_mmio_page_fault(vcpu, gpa, error_code, true); |
| 3387 | |
| 3388 | if (likely(r != RET_MMIO_PF_INVALID)) |
| 3389 | return r; |
| 3390 | } |
Xiao Guangrong | ce88dec | 2011-07-12 03:33:44 +0800 | [diff] [blame] | 3391 | |
Joerg Roedel | fb72d16 | 2008-02-07 13:47:44 +0100 | [diff] [blame] | 3392 | r = mmu_topup_memory_caches(vcpu); |
| 3393 | if (r) |
| 3394 | return r; |
| 3395 | |
Andrea Arcangeli | 936a5fe | 2011-01-13 15:46:48 -0800 | [diff] [blame] | 3396 | force_pt_level = mapping_level_dirty_bitmap(vcpu, gfn); |
| 3397 | if (likely(!force_pt_level)) { |
| 3398 | level = mapping_level(vcpu, gfn); |
| 3399 | gfn &= ~(KVM_PAGES_PER_HPAGE(level) - 1); |
| 3400 | } else |
| 3401 | level = PT_PAGE_TABLE_LEVEL; |
Joerg Roedel | 852e3c1 | 2009-07-27 16:30:44 +0200 | [diff] [blame] | 3402 | |
Xiao Guangrong | c7ba5b4 | 2012-06-20 15:59:18 +0800 | [diff] [blame] | 3403 | if (fast_page_fault(vcpu, gpa, level, error_code)) |
| 3404 | return 0; |
| 3405 | |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 3406 | mmu_seq = vcpu->kvm->mmu_notifier_seq; |
Marcelo Tosatti | 4c2155c | 2008-09-16 20:54:47 -0300 | [diff] [blame] | 3407 | smp_rmb(); |
Gleb Natapov | af585b9 | 2010-10-14 11:22:46 +0200 | [diff] [blame] | 3408 | |
Xiao Guangrong | 78b2c54 | 2010-12-07 10:48:06 +0800 | [diff] [blame] | 3409 | if (try_async_pf(vcpu, prefault, gfn, gpa, &pfn, write, &map_writable)) |
Gleb Natapov | af585b9 | 2010-10-14 11:22:46 +0200 | [diff] [blame] | 3410 | return 0; |
| 3411 | |
Xiao Guangrong | d7c5520 | 2011-07-12 03:29:38 +0800 | [diff] [blame] | 3412 | if (handle_abnormal_pfn(vcpu, 0, gfn, pfn, ACC_ALL, &r)) |
| 3413 | return r; |
| 3414 | |
Joerg Roedel | fb72d16 | 2008-02-07 13:47:44 +0100 | [diff] [blame] | 3415 | spin_lock(&vcpu->kvm->mmu_lock); |
Christoffer Dall | 8ca40a7 | 2012-10-14 23:10:18 -0400 | [diff] [blame] | 3416 | if (mmu_notifier_retry(vcpu->kvm, mmu_seq)) |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 3417 | goto out_unlock; |
Takuya Yoshikawa | 450e0b4 | 2013-03-29 14:05:26 +0900 | [diff] [blame] | 3418 | make_mmu_pages_available(vcpu); |
Andrea Arcangeli | 936a5fe | 2011-01-13 15:46:48 -0800 | [diff] [blame] | 3419 | if (likely(!force_pt_level)) |
| 3420 | transparent_hugepage_adjust(vcpu, &gfn, &pfn, &level); |
Marcelo Tosatti | 612819c | 2010-10-22 14:18:18 -0200 | [diff] [blame] | 3421 | r = __direct_map(vcpu, gpa, write, map_writable, |
Xiao Guangrong | 2ec4739 | 2010-12-07 10:34:42 +0800 | [diff] [blame] | 3422 | level, gfn, pfn, prefault); |
Joerg Roedel | fb72d16 | 2008-02-07 13:47:44 +0100 | [diff] [blame] | 3423 | spin_unlock(&vcpu->kvm->mmu_lock); |
Joerg Roedel | fb72d16 | 2008-02-07 13:47:44 +0100 | [diff] [blame] | 3424 | |
| 3425 | return r; |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 3426 | |
| 3427 | out_unlock: |
| 3428 | spin_unlock(&vcpu->kvm->mmu_lock); |
| 3429 | kvm_release_pfn_clean(pfn); |
| 3430 | return 0; |
Joerg Roedel | fb72d16 | 2008-02-07 13:47:44 +0100 | [diff] [blame] | 3431 | } |
| 3432 | |
Paolo Bonzini | 8a3c1a33 | 2013-10-02 16:56:13 +0200 | [diff] [blame] | 3433 | static void nonpaging_init_context(struct kvm_vcpu *vcpu, |
| 3434 | struct kvm_mmu *context) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3435 | { |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3436 | context->page_fault = nonpaging_page_fault; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3437 | context->gva_to_gpa = nonpaging_gva_to_gpa; |
Marcelo Tosatti | e8bc217 | 2008-09-23 13:18:33 -0300 | [diff] [blame] | 3438 | context->sync_page = nonpaging_sync_page; |
Marcelo Tosatti | a705289 | 2008-09-23 13:18:35 -0300 | [diff] [blame] | 3439 | context->invlpg = nonpaging_invlpg; |
Xiao Guangrong | 0f53b5b | 2011-03-09 15:43:51 +0800 | [diff] [blame] | 3440 | context->update_pte = nonpaging_update_pte; |
Avi Kivity | cea0f0e | 2007-01-05 16:36:43 -0800 | [diff] [blame] | 3441 | context->root_level = 0; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3442 | context->shadow_root_level = PT32E_ROOT_LEVEL; |
Avi Kivity | 17c3ba9 | 2007-06-04 15:58:30 +0300 | [diff] [blame] | 3443 | context->root_hpa = INVALID_PAGE; |
Joerg Roedel | c5a78f2b | 2010-09-10 17:30:39 +0200 | [diff] [blame] | 3444 | context->direct_map = true; |
Joerg Roedel | 2d48a98 | 2010-09-10 17:31:01 +0200 | [diff] [blame] | 3445 | context->nx = false; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3446 | } |
| 3447 | |
Avi Kivity | d835dfe | 2007-11-21 02:57:59 +0200 | [diff] [blame] | 3448 | void kvm_mmu_flush_tlb(struct kvm_vcpu *vcpu) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3449 | { |
Avi Kivity | 1165f5f | 2007-04-19 17:27:43 +0300 | [diff] [blame] | 3450 | ++vcpu->stat.tlb_flush; |
Avi Kivity | a8eeb04 | 2010-05-10 12:34:53 +0300 | [diff] [blame] | 3451 | kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3452 | } |
Nadav Har'El | bfd0a56 | 2013-08-05 11:07:17 +0300 | [diff] [blame] | 3453 | EXPORT_SYMBOL_GPL(kvm_mmu_flush_tlb); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3454 | |
Paolo Bonzini | d8d173d | 2013-10-02 16:56:11 +0200 | [diff] [blame] | 3455 | void kvm_mmu_new_cr3(struct kvm_vcpu *vcpu) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3456 | { |
Avi Kivity | cea0f0e | 2007-01-05 16:36:43 -0800 | [diff] [blame] | 3457 | mmu_free_roots(vcpu); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3458 | } |
| 3459 | |
Joerg Roedel | 5777ed3 | 2010-09-10 17:30:42 +0200 | [diff] [blame] | 3460 | static unsigned long get_cr3(struct kvm_vcpu *vcpu) |
| 3461 | { |
Avi Kivity | 9f8fe50 | 2010-12-05 17:30:00 +0200 | [diff] [blame] | 3462 | return kvm_read_cr3(vcpu); |
Joerg Roedel | 5777ed3 | 2010-09-10 17:30:42 +0200 | [diff] [blame] | 3463 | } |
| 3464 | |
Avi Kivity | 6389ee9 | 2010-11-29 16:12:30 +0200 | [diff] [blame] | 3465 | static void inject_page_fault(struct kvm_vcpu *vcpu, |
| 3466 | struct x86_exception *fault) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3467 | { |
Avi Kivity | 6389ee9 | 2010-11-29 16:12:30 +0200 | [diff] [blame] | 3468 | vcpu->arch.mmu.inject_page_fault(vcpu, fault); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3469 | } |
| 3470 | |
Xiao Guangrong | f2fd125 | 2013-06-07 16:51:24 +0800 | [diff] [blame] | 3471 | static bool sync_mmio_spte(struct kvm *kvm, u64 *sptep, gfn_t gfn, |
| 3472 | unsigned access, int *nr_present) |
Xiao Guangrong | ce88dec | 2011-07-12 03:33:44 +0800 | [diff] [blame] | 3473 | { |
| 3474 | if (unlikely(is_mmio_spte(*sptep))) { |
| 3475 | if (gfn != get_mmio_spte_gfn(*sptep)) { |
| 3476 | mmu_spte_clear_no_track(sptep); |
| 3477 | return true; |
| 3478 | } |
| 3479 | |
| 3480 | (*nr_present)++; |
Xiao Guangrong | f2fd125 | 2013-06-07 16:51:24 +0800 | [diff] [blame] | 3481 | mark_mmio_spte(kvm, sptep, gfn, access); |
Xiao Guangrong | ce88dec | 2011-07-12 03:33:44 +0800 | [diff] [blame] | 3482 | return true; |
| 3483 | } |
| 3484 | |
| 3485 | return false; |
| 3486 | } |
| 3487 | |
Avi Kivity | 6fd01b7 | 2012-09-12 20:46:56 +0300 | [diff] [blame] | 3488 | static inline bool is_last_gpte(struct kvm_mmu *mmu, unsigned level, unsigned gpte) |
| 3489 | { |
| 3490 | unsigned index; |
| 3491 | |
| 3492 | index = level - 1; |
| 3493 | index |= (gpte & PT_PAGE_SIZE_MASK) >> (PT_PAGE_SIZE_SHIFT - 2); |
| 3494 | return mmu->last_pte_bitmap & (1 << index); |
| 3495 | } |
| 3496 | |
Nadav Har'El | 37406aa | 2013-08-05 11:07:12 +0300 | [diff] [blame] | 3497 | #define PTTYPE_EPT 18 /* arbitrary */ |
| 3498 | #define PTTYPE PTTYPE_EPT |
| 3499 | #include "paging_tmpl.h" |
| 3500 | #undef PTTYPE |
| 3501 | |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3502 | #define PTTYPE 64 |
| 3503 | #include "paging_tmpl.h" |
| 3504 | #undef PTTYPE |
| 3505 | |
| 3506 | #define PTTYPE 32 |
| 3507 | #include "paging_tmpl.h" |
| 3508 | #undef PTTYPE |
| 3509 | |
Joerg Roedel | 52fde8d | 2010-09-10 17:30:44 +0200 | [diff] [blame] | 3510 | static void reset_rsvds_bits_mask(struct kvm_vcpu *vcpu, |
Davidlohr Bueso | 4d6931c | 2012-03-05 16:53:06 +0100 | [diff] [blame] | 3511 | struct kvm_mmu *context) |
Dong, Eddie | 82725b2 | 2009-03-30 16:21:08 +0800 | [diff] [blame] | 3512 | { |
Dong, Eddie | 82725b2 | 2009-03-30 16:21:08 +0800 | [diff] [blame] | 3513 | int maxphyaddr = cpuid_maxphyaddr(vcpu); |
| 3514 | u64 exb_bit_rsvd = 0; |
Nadav Amit | 5f7dde7 | 2014-05-07 15:32:50 +0300 | [diff] [blame] | 3515 | u64 gbpages_bit_rsvd = 0; |
Dong, Eddie | 82725b2 | 2009-03-30 16:21:08 +0800 | [diff] [blame] | 3516 | |
Yang Zhang | 25d9208 | 2013-08-06 12:00:32 +0300 | [diff] [blame] | 3517 | context->bad_mt_xwr = 0; |
| 3518 | |
Joerg Roedel | 2d48a98 | 2010-09-10 17:31:01 +0200 | [diff] [blame] | 3519 | if (!context->nx) |
Dong, Eddie | 82725b2 | 2009-03-30 16:21:08 +0800 | [diff] [blame] | 3520 | exb_bit_rsvd = rsvd_bits(63, 63); |
Nadav Amit | 5f7dde7 | 2014-05-07 15:32:50 +0300 | [diff] [blame] | 3521 | if (!guest_cpuid_has_gbpages(vcpu)) |
| 3522 | gbpages_bit_rsvd = rsvd_bits(7, 7); |
Davidlohr Bueso | 4d6931c | 2012-03-05 16:53:06 +0100 | [diff] [blame] | 3523 | switch (context->root_level) { |
Dong, Eddie | 82725b2 | 2009-03-30 16:21:08 +0800 | [diff] [blame] | 3524 | case PT32_ROOT_LEVEL: |
| 3525 | /* no rsvd bits for 2 level 4K page table entries */ |
| 3526 | context->rsvd_bits_mask[0][1] = 0; |
| 3527 | context->rsvd_bits_mask[0][0] = 0; |
Xiao Guangrong | f815bce | 2010-03-19 17:58:53 +0800 | [diff] [blame] | 3528 | context->rsvd_bits_mask[1][0] = context->rsvd_bits_mask[0][0]; |
| 3529 | |
| 3530 | if (!is_pse(vcpu)) { |
| 3531 | context->rsvd_bits_mask[1][1] = 0; |
| 3532 | break; |
| 3533 | } |
| 3534 | |
Dong, Eddie | 82725b2 | 2009-03-30 16:21:08 +0800 | [diff] [blame] | 3535 | if (is_cpuid_PSE36()) |
| 3536 | /* 36bits PSE 4MB page */ |
| 3537 | context->rsvd_bits_mask[1][1] = rsvd_bits(17, 21); |
| 3538 | else |
| 3539 | /* 32 bits PSE 4MB page */ |
| 3540 | context->rsvd_bits_mask[1][1] = rsvd_bits(13, 21); |
Dong, Eddie | 82725b2 | 2009-03-30 16:21:08 +0800 | [diff] [blame] | 3541 | break; |
| 3542 | case PT32E_ROOT_LEVEL: |
Dong, Eddie | 20c466b | 2009-03-31 23:03:45 +0800 | [diff] [blame] | 3543 | context->rsvd_bits_mask[0][2] = |
| 3544 | rsvd_bits(maxphyaddr, 63) | |
Nadav Amit | cd9ae5f | 2014-04-04 06:31:04 +0300 | [diff] [blame] | 3545 | rsvd_bits(5, 8) | rsvd_bits(1, 2); /* PDPTE */ |
Dong, Eddie | 82725b2 | 2009-03-30 16:21:08 +0800 | [diff] [blame] | 3546 | context->rsvd_bits_mask[0][1] = exb_bit_rsvd | |
Sheng Yang | 4c26b4c | 2009-04-02 10:28:37 +0800 | [diff] [blame] | 3547 | rsvd_bits(maxphyaddr, 62); /* PDE */ |
Dong, Eddie | 82725b2 | 2009-03-30 16:21:08 +0800 | [diff] [blame] | 3548 | context->rsvd_bits_mask[0][0] = exb_bit_rsvd | |
| 3549 | rsvd_bits(maxphyaddr, 62); /* PTE */ |
| 3550 | context->rsvd_bits_mask[1][1] = exb_bit_rsvd | |
| 3551 | rsvd_bits(maxphyaddr, 62) | |
| 3552 | rsvd_bits(13, 20); /* large page */ |
Xiao Guangrong | f815bce | 2010-03-19 17:58:53 +0800 | [diff] [blame] | 3553 | context->rsvd_bits_mask[1][0] = context->rsvd_bits_mask[0][0]; |
Dong, Eddie | 82725b2 | 2009-03-30 16:21:08 +0800 | [diff] [blame] | 3554 | break; |
| 3555 | case PT64_ROOT_LEVEL: |
| 3556 | context->rsvd_bits_mask[0][3] = exb_bit_rsvd | |
Nadav Amit | cd9ae5f | 2014-04-04 06:31:04 +0300 | [diff] [blame] | 3557 | rsvd_bits(maxphyaddr, 51) | rsvd_bits(7, 7); |
Dong, Eddie | 82725b2 | 2009-03-30 16:21:08 +0800 | [diff] [blame] | 3558 | context->rsvd_bits_mask[0][2] = exb_bit_rsvd | |
Nadav Amit | 5f7dde7 | 2014-05-07 15:32:50 +0300 | [diff] [blame] | 3559 | gbpages_bit_rsvd | rsvd_bits(maxphyaddr, 51); |
Dong, Eddie | 82725b2 | 2009-03-30 16:21:08 +0800 | [diff] [blame] | 3560 | context->rsvd_bits_mask[0][1] = exb_bit_rsvd | |
Sheng Yang | 4c26b4c | 2009-04-02 10:28:37 +0800 | [diff] [blame] | 3561 | rsvd_bits(maxphyaddr, 51); |
Dong, Eddie | 82725b2 | 2009-03-30 16:21:08 +0800 | [diff] [blame] | 3562 | context->rsvd_bits_mask[0][0] = exb_bit_rsvd | |
| 3563 | rsvd_bits(maxphyaddr, 51); |
| 3564 | context->rsvd_bits_mask[1][3] = context->rsvd_bits_mask[0][3]; |
Joerg Roedel | e04da98 | 2009-07-27 16:30:45 +0200 | [diff] [blame] | 3565 | context->rsvd_bits_mask[1][2] = exb_bit_rsvd | |
Nadav Amit | 5f7dde7 | 2014-05-07 15:32:50 +0300 | [diff] [blame] | 3566 | gbpages_bit_rsvd | rsvd_bits(maxphyaddr, 51) | |
Joerg Roedel | e04da98 | 2009-07-27 16:30:45 +0200 | [diff] [blame] | 3567 | rsvd_bits(13, 29); |
Dong, Eddie | 82725b2 | 2009-03-30 16:21:08 +0800 | [diff] [blame] | 3568 | context->rsvd_bits_mask[1][1] = exb_bit_rsvd | |
Sheng Yang | 4c26b4c | 2009-04-02 10:28:37 +0800 | [diff] [blame] | 3569 | rsvd_bits(maxphyaddr, 51) | |
| 3570 | rsvd_bits(13, 20); /* large page */ |
Xiao Guangrong | f815bce | 2010-03-19 17:58:53 +0800 | [diff] [blame] | 3571 | context->rsvd_bits_mask[1][0] = context->rsvd_bits_mask[0][0]; |
Dong, Eddie | 82725b2 | 2009-03-30 16:21:08 +0800 | [diff] [blame] | 3572 | break; |
| 3573 | } |
| 3574 | } |
| 3575 | |
Yang Zhang | 25d9208 | 2013-08-06 12:00:32 +0300 | [diff] [blame] | 3576 | static void reset_rsvds_bits_mask_ept(struct kvm_vcpu *vcpu, |
| 3577 | struct kvm_mmu *context, bool execonly) |
| 3578 | { |
| 3579 | int maxphyaddr = cpuid_maxphyaddr(vcpu); |
| 3580 | int pte; |
| 3581 | |
| 3582 | context->rsvd_bits_mask[0][3] = |
| 3583 | rsvd_bits(maxphyaddr, 51) | rsvd_bits(3, 7); |
| 3584 | context->rsvd_bits_mask[0][2] = |
| 3585 | rsvd_bits(maxphyaddr, 51) | rsvd_bits(3, 6); |
| 3586 | context->rsvd_bits_mask[0][1] = |
| 3587 | rsvd_bits(maxphyaddr, 51) | rsvd_bits(3, 6); |
| 3588 | context->rsvd_bits_mask[0][0] = rsvd_bits(maxphyaddr, 51); |
| 3589 | |
| 3590 | /* large page */ |
| 3591 | context->rsvd_bits_mask[1][3] = context->rsvd_bits_mask[0][3]; |
| 3592 | context->rsvd_bits_mask[1][2] = |
| 3593 | rsvd_bits(maxphyaddr, 51) | rsvd_bits(12, 29); |
| 3594 | context->rsvd_bits_mask[1][1] = |
| 3595 | rsvd_bits(maxphyaddr, 51) | rsvd_bits(12, 20); |
| 3596 | context->rsvd_bits_mask[1][0] = context->rsvd_bits_mask[0][0]; |
| 3597 | |
| 3598 | for (pte = 0; pte < 64; pte++) { |
| 3599 | int rwx_bits = pte & 7; |
| 3600 | int mt = pte >> 3; |
| 3601 | if (mt == 0x2 || mt == 0x3 || mt == 0x7 || |
| 3602 | rwx_bits == 0x2 || rwx_bits == 0x6 || |
| 3603 | (rwx_bits == 0x4 && !execonly)) |
| 3604 | context->bad_mt_xwr |= (1ull << pte); |
| 3605 | } |
| 3606 | } |
| 3607 | |
Feng Wu | 97ec8c0 | 2014-04-01 17:46:34 +0800 | [diff] [blame] | 3608 | void update_permission_bitmask(struct kvm_vcpu *vcpu, |
Yang Zhang | 25d9208 | 2013-08-06 12:00:32 +0300 | [diff] [blame] | 3609 | struct kvm_mmu *mmu, bool ept) |
Avi Kivity | 97d64b7 | 2012-09-12 14:52:00 +0300 | [diff] [blame] | 3610 | { |
| 3611 | unsigned bit, byte, pfec; |
| 3612 | u8 map; |
Feng Wu | 66386ad | 2014-04-01 17:56:48 +0800 | [diff] [blame] | 3613 | bool fault, x, w, u, wf, uf, ff, smapf, cr4_smap, cr4_smep, smap = 0; |
Avi Kivity | 97d64b7 | 2012-09-12 14:52:00 +0300 | [diff] [blame] | 3614 | |
Feng Wu | 66386ad | 2014-04-01 17:56:48 +0800 | [diff] [blame] | 3615 | cr4_smep = kvm_read_cr4_bits(vcpu, X86_CR4_SMEP); |
Feng Wu | 97ec8c0 | 2014-04-01 17:46:34 +0800 | [diff] [blame] | 3616 | cr4_smap = kvm_read_cr4_bits(vcpu, X86_CR4_SMAP); |
Avi Kivity | 97d64b7 | 2012-09-12 14:52:00 +0300 | [diff] [blame] | 3617 | for (byte = 0; byte < ARRAY_SIZE(mmu->permissions); ++byte) { |
| 3618 | pfec = byte << 1; |
| 3619 | map = 0; |
| 3620 | wf = pfec & PFERR_WRITE_MASK; |
| 3621 | uf = pfec & PFERR_USER_MASK; |
| 3622 | ff = pfec & PFERR_FETCH_MASK; |
Feng Wu | 97ec8c0 | 2014-04-01 17:46:34 +0800 | [diff] [blame] | 3623 | /* |
| 3624 | * PFERR_RSVD_MASK bit is set in PFEC if the access is not |
| 3625 | * subject to SMAP restrictions, and cleared otherwise. The |
| 3626 | * bit is only meaningful if the SMAP bit is set in CR4. |
| 3627 | */ |
| 3628 | smapf = !(pfec & PFERR_RSVD_MASK); |
Avi Kivity | 97d64b7 | 2012-09-12 14:52:00 +0300 | [diff] [blame] | 3629 | for (bit = 0; bit < 8; ++bit) { |
| 3630 | x = bit & ACC_EXEC_MASK; |
| 3631 | w = bit & ACC_WRITE_MASK; |
| 3632 | u = bit & ACC_USER_MASK; |
| 3633 | |
Yang Zhang | 25d9208 | 2013-08-06 12:00:32 +0300 | [diff] [blame] | 3634 | if (!ept) { |
| 3635 | /* Not really needed: !nx will cause pte.nx to fault */ |
| 3636 | x |= !mmu->nx; |
| 3637 | /* Allow supervisor writes if !cr0.wp */ |
| 3638 | w |= !is_write_protection(vcpu) && !uf; |
| 3639 | /* Disallow supervisor fetches of user code if cr4.smep */ |
Feng Wu | 66386ad | 2014-04-01 17:56:48 +0800 | [diff] [blame] | 3640 | x &= !(cr4_smep && u && !uf); |
Feng Wu | 97ec8c0 | 2014-04-01 17:46:34 +0800 | [diff] [blame] | 3641 | |
| 3642 | /* |
| 3643 | * SMAP:kernel-mode data accesses from user-mode |
| 3644 | * mappings should fault. A fault is considered |
| 3645 | * as a SMAP violation if all of the following |
| 3646 | * conditions are ture: |
| 3647 | * - X86_CR4_SMAP is set in CR4 |
| 3648 | * - An user page is accessed |
| 3649 | * - Page fault in kernel mode |
| 3650 | * - if CPL = 3 or X86_EFLAGS_AC is clear |
| 3651 | * |
| 3652 | * Here, we cover the first three conditions. |
| 3653 | * The fourth is computed dynamically in |
| 3654 | * permission_fault() and is in smapf. |
| 3655 | * |
| 3656 | * Also, SMAP does not affect instruction |
| 3657 | * fetches, add the !ff check here to make it |
| 3658 | * clearer. |
| 3659 | */ |
| 3660 | smap = cr4_smap && u && !uf && !ff; |
Yang Zhang | 25d9208 | 2013-08-06 12:00:32 +0300 | [diff] [blame] | 3661 | } else |
| 3662 | /* Not really needed: no U/S accesses on ept */ |
| 3663 | u = 1; |
Avi Kivity | 97d64b7 | 2012-09-12 14:52:00 +0300 | [diff] [blame] | 3664 | |
Feng Wu | 97ec8c0 | 2014-04-01 17:46:34 +0800 | [diff] [blame] | 3665 | fault = (ff && !x) || (uf && !u) || (wf && !w) || |
| 3666 | (smapf && smap); |
Avi Kivity | 97d64b7 | 2012-09-12 14:52:00 +0300 | [diff] [blame] | 3667 | map |= fault << bit; |
| 3668 | } |
| 3669 | mmu->permissions[byte] = map; |
| 3670 | } |
| 3671 | } |
| 3672 | |
Avi Kivity | 6fd01b7 | 2012-09-12 20:46:56 +0300 | [diff] [blame] | 3673 | static void update_last_pte_bitmap(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu) |
| 3674 | { |
| 3675 | u8 map; |
| 3676 | unsigned level, root_level = mmu->root_level; |
| 3677 | const unsigned ps_set_index = 1 << 2; /* bit 2 of index: ps */ |
| 3678 | |
| 3679 | if (root_level == PT32E_ROOT_LEVEL) |
| 3680 | --root_level; |
| 3681 | /* PT_PAGE_TABLE_LEVEL always terminates */ |
| 3682 | map = 1 | (1 << ps_set_index); |
| 3683 | for (level = PT_DIRECTORY_LEVEL; level <= root_level; ++level) { |
| 3684 | if (level <= PT_PDPE_LEVEL |
| 3685 | && (mmu->root_level >= PT32E_ROOT_LEVEL || is_pse(vcpu))) |
| 3686 | map |= 1 << (ps_set_index | (level - 1)); |
| 3687 | } |
| 3688 | mmu->last_pte_bitmap = map; |
| 3689 | } |
| 3690 | |
Paolo Bonzini | 8a3c1a33 | 2013-10-02 16:56:13 +0200 | [diff] [blame] | 3691 | static void paging64_init_context_common(struct kvm_vcpu *vcpu, |
| 3692 | struct kvm_mmu *context, |
| 3693 | int level) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3694 | { |
Joerg Roedel | 2d48a98 | 2010-09-10 17:31:01 +0200 | [diff] [blame] | 3695 | context->nx = is_nx(vcpu); |
Davidlohr Bueso | 4d6931c | 2012-03-05 16:53:06 +0100 | [diff] [blame] | 3696 | context->root_level = level; |
Joerg Roedel | 2d48a98 | 2010-09-10 17:31:01 +0200 | [diff] [blame] | 3697 | |
Davidlohr Bueso | 4d6931c | 2012-03-05 16:53:06 +0100 | [diff] [blame] | 3698 | reset_rsvds_bits_mask(vcpu, context); |
Yang Zhang | 25d9208 | 2013-08-06 12:00:32 +0300 | [diff] [blame] | 3699 | update_permission_bitmask(vcpu, context, false); |
Avi Kivity | 6fd01b7 | 2012-09-12 20:46:56 +0300 | [diff] [blame] | 3700 | update_last_pte_bitmap(vcpu, context); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3701 | |
| 3702 | ASSERT(is_pae(vcpu)); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3703 | context->page_fault = paging64_page_fault; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3704 | context->gva_to_gpa = paging64_gva_to_gpa; |
Marcelo Tosatti | e8bc217 | 2008-09-23 13:18:33 -0300 | [diff] [blame] | 3705 | context->sync_page = paging64_sync_page; |
Marcelo Tosatti | a705289 | 2008-09-23 13:18:35 -0300 | [diff] [blame] | 3706 | context->invlpg = paging64_invlpg; |
Xiao Guangrong | 0f53b5b | 2011-03-09 15:43:51 +0800 | [diff] [blame] | 3707 | context->update_pte = paging64_update_pte; |
Avi Kivity | 17ac10a | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 3708 | context->shadow_root_level = level; |
Avi Kivity | 17c3ba9 | 2007-06-04 15:58:30 +0300 | [diff] [blame] | 3709 | context->root_hpa = INVALID_PAGE; |
Joerg Roedel | c5a78f2b | 2010-09-10 17:30:39 +0200 | [diff] [blame] | 3710 | context->direct_map = false; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3711 | } |
| 3712 | |
Paolo Bonzini | 8a3c1a33 | 2013-10-02 16:56:13 +0200 | [diff] [blame] | 3713 | static void paging64_init_context(struct kvm_vcpu *vcpu, |
| 3714 | struct kvm_mmu *context) |
Avi Kivity | 17ac10a | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 3715 | { |
Paolo Bonzini | 8a3c1a33 | 2013-10-02 16:56:13 +0200 | [diff] [blame] | 3716 | paging64_init_context_common(vcpu, context, PT64_ROOT_LEVEL); |
Avi Kivity | 17ac10a | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 3717 | } |
| 3718 | |
Paolo Bonzini | 8a3c1a33 | 2013-10-02 16:56:13 +0200 | [diff] [blame] | 3719 | static void paging32_init_context(struct kvm_vcpu *vcpu, |
| 3720 | struct kvm_mmu *context) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3721 | { |
Joerg Roedel | 2d48a98 | 2010-09-10 17:31:01 +0200 | [diff] [blame] | 3722 | context->nx = false; |
Davidlohr Bueso | 4d6931c | 2012-03-05 16:53:06 +0100 | [diff] [blame] | 3723 | context->root_level = PT32_ROOT_LEVEL; |
Joerg Roedel | 2d48a98 | 2010-09-10 17:31:01 +0200 | [diff] [blame] | 3724 | |
Davidlohr Bueso | 4d6931c | 2012-03-05 16:53:06 +0100 | [diff] [blame] | 3725 | reset_rsvds_bits_mask(vcpu, context); |
Yang Zhang | 25d9208 | 2013-08-06 12:00:32 +0300 | [diff] [blame] | 3726 | update_permission_bitmask(vcpu, context, false); |
Avi Kivity | 6fd01b7 | 2012-09-12 20:46:56 +0300 | [diff] [blame] | 3727 | update_last_pte_bitmap(vcpu, context); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3728 | |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3729 | context->page_fault = paging32_page_fault; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3730 | context->gva_to_gpa = paging32_gva_to_gpa; |
Marcelo Tosatti | e8bc217 | 2008-09-23 13:18:33 -0300 | [diff] [blame] | 3731 | context->sync_page = paging32_sync_page; |
Marcelo Tosatti | a705289 | 2008-09-23 13:18:35 -0300 | [diff] [blame] | 3732 | context->invlpg = paging32_invlpg; |
Xiao Guangrong | 0f53b5b | 2011-03-09 15:43:51 +0800 | [diff] [blame] | 3733 | context->update_pte = paging32_update_pte; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3734 | context->shadow_root_level = PT32E_ROOT_LEVEL; |
Avi Kivity | 17c3ba9 | 2007-06-04 15:58:30 +0300 | [diff] [blame] | 3735 | context->root_hpa = INVALID_PAGE; |
Joerg Roedel | c5a78f2b | 2010-09-10 17:30:39 +0200 | [diff] [blame] | 3736 | context->direct_map = false; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3737 | } |
| 3738 | |
Paolo Bonzini | 8a3c1a33 | 2013-10-02 16:56:13 +0200 | [diff] [blame] | 3739 | static void paging32E_init_context(struct kvm_vcpu *vcpu, |
| 3740 | struct kvm_mmu *context) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3741 | { |
Paolo Bonzini | 8a3c1a33 | 2013-10-02 16:56:13 +0200 | [diff] [blame] | 3742 | paging64_init_context_common(vcpu, context, PT32E_ROOT_LEVEL); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3743 | } |
| 3744 | |
Paolo Bonzini | 8a3c1a33 | 2013-10-02 16:56:13 +0200 | [diff] [blame] | 3745 | static void init_kvm_tdp_mmu(struct kvm_vcpu *vcpu) |
Joerg Roedel | fb72d16 | 2008-02-07 13:47:44 +0100 | [diff] [blame] | 3746 | { |
Joerg Roedel | 14dfe85 | 2010-09-10 17:30:49 +0200 | [diff] [blame] | 3747 | struct kvm_mmu *context = vcpu->arch.walk_mmu; |
Joerg Roedel | fb72d16 | 2008-02-07 13:47:44 +0100 | [diff] [blame] | 3748 | |
Avi Kivity | c445f8e | 2010-12-21 16:26:01 +0200 | [diff] [blame] | 3749 | context->base_role.word = 0; |
Joerg Roedel | fb72d16 | 2008-02-07 13:47:44 +0100 | [diff] [blame] | 3750 | context->page_fault = tdp_page_fault; |
Marcelo Tosatti | e8bc217 | 2008-09-23 13:18:33 -0300 | [diff] [blame] | 3751 | context->sync_page = nonpaging_sync_page; |
Marcelo Tosatti | a705289 | 2008-09-23 13:18:35 -0300 | [diff] [blame] | 3752 | context->invlpg = nonpaging_invlpg; |
Xiao Guangrong | 0f53b5b | 2011-03-09 15:43:51 +0800 | [diff] [blame] | 3753 | context->update_pte = nonpaging_update_pte; |
Sheng Yang | 67253af | 2008-04-25 10:20:22 +0800 | [diff] [blame] | 3754 | context->shadow_root_level = kvm_x86_ops->get_tdp_level(); |
Joerg Roedel | fb72d16 | 2008-02-07 13:47:44 +0100 | [diff] [blame] | 3755 | context->root_hpa = INVALID_PAGE; |
Joerg Roedel | c5a78f2b | 2010-09-10 17:30:39 +0200 | [diff] [blame] | 3756 | context->direct_map = true; |
Joerg Roedel | 1c97f0a | 2010-09-10 17:30:41 +0200 | [diff] [blame] | 3757 | context->set_cr3 = kvm_x86_ops->set_tdp_cr3; |
Joerg Roedel | 5777ed3 | 2010-09-10 17:30:42 +0200 | [diff] [blame] | 3758 | context->get_cr3 = get_cr3; |
Avi Kivity | e4e517b | 2011-07-28 11:36:17 +0300 | [diff] [blame] | 3759 | context->get_pdptr = kvm_pdptr_read; |
Joerg Roedel | cb659db | 2010-09-10 17:30:43 +0200 | [diff] [blame] | 3760 | context->inject_page_fault = kvm_inject_page_fault; |
Joerg Roedel | fb72d16 | 2008-02-07 13:47:44 +0100 | [diff] [blame] | 3761 | |
| 3762 | if (!is_paging(vcpu)) { |
Joerg Roedel | 2d48a98 | 2010-09-10 17:31:01 +0200 | [diff] [blame] | 3763 | context->nx = false; |
Joerg Roedel | fb72d16 | 2008-02-07 13:47:44 +0100 | [diff] [blame] | 3764 | context->gva_to_gpa = nonpaging_gva_to_gpa; |
| 3765 | context->root_level = 0; |
| 3766 | } else if (is_long_mode(vcpu)) { |
Joerg Roedel | 2d48a98 | 2010-09-10 17:31:01 +0200 | [diff] [blame] | 3767 | context->nx = is_nx(vcpu); |
Joerg Roedel | fb72d16 | 2008-02-07 13:47:44 +0100 | [diff] [blame] | 3768 | context->root_level = PT64_ROOT_LEVEL; |
Davidlohr Bueso | 4d6931c | 2012-03-05 16:53:06 +0100 | [diff] [blame] | 3769 | reset_rsvds_bits_mask(vcpu, context); |
| 3770 | context->gva_to_gpa = paging64_gva_to_gpa; |
Joerg Roedel | fb72d16 | 2008-02-07 13:47:44 +0100 | [diff] [blame] | 3771 | } else if (is_pae(vcpu)) { |
Joerg Roedel | 2d48a98 | 2010-09-10 17:31:01 +0200 | [diff] [blame] | 3772 | context->nx = is_nx(vcpu); |
Joerg Roedel | fb72d16 | 2008-02-07 13:47:44 +0100 | [diff] [blame] | 3773 | context->root_level = PT32E_ROOT_LEVEL; |
Davidlohr Bueso | 4d6931c | 2012-03-05 16:53:06 +0100 | [diff] [blame] | 3774 | reset_rsvds_bits_mask(vcpu, context); |
| 3775 | context->gva_to_gpa = paging64_gva_to_gpa; |
Joerg Roedel | fb72d16 | 2008-02-07 13:47:44 +0100 | [diff] [blame] | 3776 | } else { |
Joerg Roedel | 2d48a98 | 2010-09-10 17:31:01 +0200 | [diff] [blame] | 3777 | context->nx = false; |
Joerg Roedel | fb72d16 | 2008-02-07 13:47:44 +0100 | [diff] [blame] | 3778 | context->root_level = PT32_ROOT_LEVEL; |
Davidlohr Bueso | 4d6931c | 2012-03-05 16:53:06 +0100 | [diff] [blame] | 3779 | reset_rsvds_bits_mask(vcpu, context); |
| 3780 | context->gva_to_gpa = paging32_gva_to_gpa; |
Joerg Roedel | fb72d16 | 2008-02-07 13:47:44 +0100 | [diff] [blame] | 3781 | } |
| 3782 | |
Yang Zhang | 25d9208 | 2013-08-06 12:00:32 +0300 | [diff] [blame] | 3783 | update_permission_bitmask(vcpu, context, false); |
Avi Kivity | 6fd01b7 | 2012-09-12 20:46:56 +0300 | [diff] [blame] | 3784 | update_last_pte_bitmap(vcpu, context); |
Joerg Roedel | fb72d16 | 2008-02-07 13:47:44 +0100 | [diff] [blame] | 3785 | } |
| 3786 | |
Paolo Bonzini | 8a3c1a33 | 2013-10-02 16:56:13 +0200 | [diff] [blame] | 3787 | void kvm_init_shadow_mmu(struct kvm_vcpu *vcpu, struct kvm_mmu *context) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3788 | { |
Avi Kivity | 411c588 | 2011-06-06 16:11:54 +0300 | [diff] [blame] | 3789 | bool smep = kvm_read_cr4_bits(vcpu, X86_CR4_SMEP); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3790 | ASSERT(vcpu); |
Zhang Xiantao | ad312c7 | 2007-12-13 23:50:52 +0800 | [diff] [blame] | 3791 | ASSERT(!VALID_PAGE(vcpu->arch.mmu.root_hpa)); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3792 | |
| 3793 | if (!is_paging(vcpu)) |
Paolo Bonzini | 8a3c1a33 | 2013-10-02 16:56:13 +0200 | [diff] [blame] | 3794 | nonpaging_init_context(vcpu, context); |
Avi Kivity | a9058ec | 2006-12-29 16:49:37 -0800 | [diff] [blame] | 3795 | else if (is_long_mode(vcpu)) |
Paolo Bonzini | 8a3c1a33 | 2013-10-02 16:56:13 +0200 | [diff] [blame] | 3796 | paging64_init_context(vcpu, context); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3797 | else if (is_pae(vcpu)) |
Paolo Bonzini | 8a3c1a33 | 2013-10-02 16:56:13 +0200 | [diff] [blame] | 3798 | paging32E_init_context(vcpu, context); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3799 | else |
Paolo Bonzini | 8a3c1a33 | 2013-10-02 16:56:13 +0200 | [diff] [blame] | 3800 | paging32_init_context(vcpu, context); |
Avi Kivity | a770f6f | 2008-12-21 19:20:09 +0200 | [diff] [blame] | 3801 | |
Gleb Natapov | 2c9afa5 | 2013-01-30 16:45:02 +0200 | [diff] [blame] | 3802 | vcpu->arch.mmu.base_role.nxe = is_nx(vcpu); |
Avi Kivity | 5b7e010 | 2010-04-14 19:20:03 +0300 | [diff] [blame] | 3803 | vcpu->arch.mmu.base_role.cr4_pae = !!is_pae(vcpu); |
Joerg Roedel | f43addd | 2010-09-10 17:30:40 +0200 | [diff] [blame] | 3804 | vcpu->arch.mmu.base_role.cr0_wp = is_write_protection(vcpu); |
Avi Kivity | 411c588 | 2011-06-06 16:11:54 +0300 | [diff] [blame] | 3805 | vcpu->arch.mmu.base_role.smep_andnot_wp |
| 3806 | = smep && !is_write_protection(vcpu); |
Joerg Roedel | 52fde8d | 2010-09-10 17:30:44 +0200 | [diff] [blame] | 3807 | } |
| 3808 | EXPORT_SYMBOL_GPL(kvm_init_shadow_mmu); |
| 3809 | |
Paolo Bonzini | 8a3c1a33 | 2013-10-02 16:56:13 +0200 | [diff] [blame] | 3810 | void kvm_init_shadow_ept_mmu(struct kvm_vcpu *vcpu, struct kvm_mmu *context, |
Nadav Har'El | 155a97a | 2013-08-05 11:07:16 +0300 | [diff] [blame] | 3811 | bool execonly) |
| 3812 | { |
| 3813 | ASSERT(vcpu); |
| 3814 | ASSERT(!VALID_PAGE(vcpu->arch.mmu.root_hpa)); |
| 3815 | |
| 3816 | context->shadow_root_level = kvm_x86_ops->get_tdp_level(); |
| 3817 | |
| 3818 | context->nx = true; |
Nadav Har'El | 155a97a | 2013-08-05 11:07:16 +0300 | [diff] [blame] | 3819 | context->page_fault = ept_page_fault; |
| 3820 | context->gva_to_gpa = ept_gva_to_gpa; |
| 3821 | context->sync_page = ept_sync_page; |
| 3822 | context->invlpg = ept_invlpg; |
| 3823 | context->update_pte = ept_update_pte; |
Nadav Har'El | 155a97a | 2013-08-05 11:07:16 +0300 | [diff] [blame] | 3824 | context->root_level = context->shadow_root_level; |
| 3825 | context->root_hpa = INVALID_PAGE; |
| 3826 | context->direct_map = false; |
| 3827 | |
| 3828 | update_permission_bitmask(vcpu, context, true); |
| 3829 | reset_rsvds_bits_mask_ept(vcpu, context, execonly); |
Nadav Har'El | 155a97a | 2013-08-05 11:07:16 +0300 | [diff] [blame] | 3830 | } |
| 3831 | EXPORT_SYMBOL_GPL(kvm_init_shadow_ept_mmu); |
| 3832 | |
Paolo Bonzini | 8a3c1a33 | 2013-10-02 16:56:13 +0200 | [diff] [blame] | 3833 | static void init_kvm_softmmu(struct kvm_vcpu *vcpu) |
Joerg Roedel | 52fde8d | 2010-09-10 17:30:44 +0200 | [diff] [blame] | 3834 | { |
Paolo Bonzini | 8a3c1a33 | 2013-10-02 16:56:13 +0200 | [diff] [blame] | 3835 | kvm_init_shadow_mmu(vcpu, vcpu->arch.walk_mmu); |
Joerg Roedel | 14dfe85 | 2010-09-10 17:30:49 +0200 | [diff] [blame] | 3836 | vcpu->arch.walk_mmu->set_cr3 = kvm_x86_ops->set_cr3; |
| 3837 | vcpu->arch.walk_mmu->get_cr3 = get_cr3; |
Avi Kivity | e4e517b | 2011-07-28 11:36:17 +0300 | [diff] [blame] | 3838 | vcpu->arch.walk_mmu->get_pdptr = kvm_pdptr_read; |
Joerg Roedel | 14dfe85 | 2010-09-10 17:30:49 +0200 | [diff] [blame] | 3839 | vcpu->arch.walk_mmu->inject_page_fault = kvm_inject_page_fault; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3840 | } |
| 3841 | |
Paolo Bonzini | 8a3c1a33 | 2013-10-02 16:56:13 +0200 | [diff] [blame] | 3842 | static void init_kvm_nested_mmu(struct kvm_vcpu *vcpu) |
Joerg Roedel | 02f59dc | 2010-09-10 17:30:54 +0200 | [diff] [blame] | 3843 | { |
| 3844 | struct kvm_mmu *g_context = &vcpu->arch.nested_mmu; |
| 3845 | |
| 3846 | g_context->get_cr3 = get_cr3; |
Avi Kivity | e4e517b | 2011-07-28 11:36:17 +0300 | [diff] [blame] | 3847 | g_context->get_pdptr = kvm_pdptr_read; |
Joerg Roedel | 02f59dc | 2010-09-10 17:30:54 +0200 | [diff] [blame] | 3848 | g_context->inject_page_fault = kvm_inject_page_fault; |
| 3849 | |
| 3850 | /* |
| 3851 | * Note that arch.mmu.gva_to_gpa translates l2_gva to l1_gpa. The |
| 3852 | * translation of l2_gpa to l1_gpa addresses is done using the |
| 3853 | * arch.nested_mmu.gva_to_gpa function. Basically the gva_to_gpa |
| 3854 | * functions between mmu and nested_mmu are swapped. |
| 3855 | */ |
| 3856 | if (!is_paging(vcpu)) { |
Joerg Roedel | 2d48a98 | 2010-09-10 17:31:01 +0200 | [diff] [blame] | 3857 | g_context->nx = false; |
Joerg Roedel | 02f59dc | 2010-09-10 17:30:54 +0200 | [diff] [blame] | 3858 | g_context->root_level = 0; |
| 3859 | g_context->gva_to_gpa = nonpaging_gva_to_gpa_nested; |
| 3860 | } else if (is_long_mode(vcpu)) { |
Joerg Roedel | 2d48a98 | 2010-09-10 17:31:01 +0200 | [diff] [blame] | 3861 | g_context->nx = is_nx(vcpu); |
Joerg Roedel | 02f59dc | 2010-09-10 17:30:54 +0200 | [diff] [blame] | 3862 | g_context->root_level = PT64_ROOT_LEVEL; |
Davidlohr Bueso | 4d6931c | 2012-03-05 16:53:06 +0100 | [diff] [blame] | 3863 | reset_rsvds_bits_mask(vcpu, g_context); |
Joerg Roedel | 02f59dc | 2010-09-10 17:30:54 +0200 | [diff] [blame] | 3864 | g_context->gva_to_gpa = paging64_gva_to_gpa_nested; |
| 3865 | } else if (is_pae(vcpu)) { |
Joerg Roedel | 2d48a98 | 2010-09-10 17:31:01 +0200 | [diff] [blame] | 3866 | g_context->nx = is_nx(vcpu); |
Joerg Roedel | 02f59dc | 2010-09-10 17:30:54 +0200 | [diff] [blame] | 3867 | g_context->root_level = PT32E_ROOT_LEVEL; |
Davidlohr Bueso | 4d6931c | 2012-03-05 16:53:06 +0100 | [diff] [blame] | 3868 | reset_rsvds_bits_mask(vcpu, g_context); |
Joerg Roedel | 02f59dc | 2010-09-10 17:30:54 +0200 | [diff] [blame] | 3869 | g_context->gva_to_gpa = paging64_gva_to_gpa_nested; |
| 3870 | } else { |
Joerg Roedel | 2d48a98 | 2010-09-10 17:31:01 +0200 | [diff] [blame] | 3871 | g_context->nx = false; |
Joerg Roedel | 02f59dc | 2010-09-10 17:30:54 +0200 | [diff] [blame] | 3872 | g_context->root_level = PT32_ROOT_LEVEL; |
Davidlohr Bueso | 4d6931c | 2012-03-05 16:53:06 +0100 | [diff] [blame] | 3873 | reset_rsvds_bits_mask(vcpu, g_context); |
Joerg Roedel | 02f59dc | 2010-09-10 17:30:54 +0200 | [diff] [blame] | 3874 | g_context->gva_to_gpa = paging32_gva_to_gpa_nested; |
| 3875 | } |
| 3876 | |
Yang Zhang | 25d9208 | 2013-08-06 12:00:32 +0300 | [diff] [blame] | 3877 | update_permission_bitmask(vcpu, g_context, false); |
Avi Kivity | 6fd01b7 | 2012-09-12 20:46:56 +0300 | [diff] [blame] | 3878 | update_last_pte_bitmap(vcpu, g_context); |
Joerg Roedel | 02f59dc | 2010-09-10 17:30:54 +0200 | [diff] [blame] | 3879 | } |
| 3880 | |
Paolo Bonzini | 8a3c1a33 | 2013-10-02 16:56:13 +0200 | [diff] [blame] | 3881 | static void init_kvm_mmu(struct kvm_vcpu *vcpu) |
Joerg Roedel | fb72d16 | 2008-02-07 13:47:44 +0100 | [diff] [blame] | 3882 | { |
Joerg Roedel | 02f59dc | 2010-09-10 17:30:54 +0200 | [diff] [blame] | 3883 | if (mmu_is_nested(vcpu)) |
| 3884 | return init_kvm_nested_mmu(vcpu); |
| 3885 | else if (tdp_enabled) |
Joerg Roedel | fb72d16 | 2008-02-07 13:47:44 +0100 | [diff] [blame] | 3886 | return init_kvm_tdp_mmu(vcpu); |
| 3887 | else |
| 3888 | return init_kvm_softmmu(vcpu); |
| 3889 | } |
| 3890 | |
Paolo Bonzini | 8a3c1a33 | 2013-10-02 16:56:13 +0200 | [diff] [blame] | 3891 | void kvm_mmu_reset_context(struct kvm_vcpu *vcpu) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3892 | { |
Paolo Bonzini | 95f93af | 2013-10-02 16:56:12 +0200 | [diff] [blame] | 3893 | ASSERT(vcpu); |
| 3894 | |
| 3895 | kvm_mmu_unload(vcpu); |
Paolo Bonzini | 8a3c1a33 | 2013-10-02 16:56:13 +0200 | [diff] [blame] | 3896 | init_kvm_mmu(vcpu); |
Avi Kivity | 17c3ba9 | 2007-06-04 15:58:30 +0300 | [diff] [blame] | 3897 | } |
Eddie Dong | 8668a3c | 2007-10-10 14:26:45 +0800 | [diff] [blame] | 3898 | EXPORT_SYMBOL_GPL(kvm_mmu_reset_context); |
Avi Kivity | 17c3ba9 | 2007-06-04 15:58:30 +0300 | [diff] [blame] | 3899 | |
| 3900 | int kvm_mmu_load(struct kvm_vcpu *vcpu) |
| 3901 | { |
Avi Kivity | 714b93d | 2007-01-05 16:36:53 -0800 | [diff] [blame] | 3902 | int r; |
| 3903 | |
Avi Kivity | e2dec93 | 2007-01-05 16:36:54 -0800 | [diff] [blame] | 3904 | r = mmu_topup_memory_caches(vcpu); |
Avi Kivity | 17c3ba9 | 2007-06-04 15:58:30 +0300 | [diff] [blame] | 3905 | if (r) |
| 3906 | goto out; |
Marcelo Tosatti | 8986ecc | 2009-05-12 18:55:45 -0300 | [diff] [blame] | 3907 | r = mmu_alloc_roots(vcpu); |
Takuya Yoshikawa | e2858b4 | 2013-05-09 15:45:12 +0900 | [diff] [blame] | 3908 | kvm_mmu_sync_roots(vcpu); |
Marcelo Tosatti | 8986ecc | 2009-05-12 18:55:45 -0300 | [diff] [blame] | 3909 | if (r) |
| 3910 | goto out; |
Sheng Yang | 3662cb1 | 2009-07-09 17:00:42 +0800 | [diff] [blame] | 3911 | /* set_cr3() should ensure TLB has been flushed */ |
Joerg Roedel | f43addd | 2010-09-10 17:30:40 +0200 | [diff] [blame] | 3912 | vcpu->arch.mmu.set_cr3(vcpu, vcpu->arch.mmu.root_hpa); |
Avi Kivity | 714b93d | 2007-01-05 16:36:53 -0800 | [diff] [blame] | 3913 | out: |
| 3914 | return r; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3915 | } |
Avi Kivity | 17c3ba9 | 2007-06-04 15:58:30 +0300 | [diff] [blame] | 3916 | EXPORT_SYMBOL_GPL(kvm_mmu_load); |
| 3917 | |
| 3918 | void kvm_mmu_unload(struct kvm_vcpu *vcpu) |
| 3919 | { |
| 3920 | mmu_free_roots(vcpu); |
Paolo Bonzini | 95f93af | 2013-10-02 16:56:12 +0200 | [diff] [blame] | 3921 | WARN_ON(VALID_PAGE(vcpu->arch.mmu.root_hpa)); |
Avi Kivity | 17c3ba9 | 2007-06-04 15:58:30 +0300 | [diff] [blame] | 3922 | } |
Joerg Roedel | 4b16184 | 2010-09-10 17:31:03 +0200 | [diff] [blame] | 3923 | EXPORT_SYMBOL_GPL(kvm_mmu_unload); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3924 | |
Avi Kivity | 0028425 | 2007-05-01 16:53:31 +0300 | [diff] [blame] | 3925 | static void mmu_pte_write_new_pte(struct kvm_vcpu *vcpu, |
Xiao Guangrong | 7c56252 | 2011-03-28 10:29:27 +0800 | [diff] [blame] | 3926 | struct kvm_mmu_page *sp, u64 *spte, |
| 3927 | const void *new) |
Avi Kivity | 0028425 | 2007-05-01 16:53:31 +0300 | [diff] [blame] | 3928 | { |
Marcelo Tosatti | 3094538 | 2008-06-11 20:32:40 -0300 | [diff] [blame] | 3929 | if (sp->role.level != PT_PAGE_TABLE_LEVEL) { |
Joerg Roedel | 7e4e405 | 2009-07-27 16:30:46 +0200 | [diff] [blame] | 3930 | ++vcpu->kvm->stat.mmu_pde_zapped; |
| 3931 | return; |
Marcelo Tosatti | 3094538 | 2008-06-11 20:32:40 -0300 | [diff] [blame] | 3932 | } |
Avi Kivity | 0028425 | 2007-05-01 16:53:31 +0300 | [diff] [blame] | 3933 | |
Avi Kivity | 4cee576 | 2007-11-18 16:37:07 +0200 | [diff] [blame] | 3934 | ++vcpu->kvm->stat.mmu_pte_updated; |
Xiao Guangrong | 7c56252 | 2011-03-28 10:29:27 +0800 | [diff] [blame] | 3935 | vcpu->arch.mmu.update_pte(vcpu, sp, spte, new); |
Avi Kivity | 0028425 | 2007-05-01 16:53:31 +0300 | [diff] [blame] | 3936 | } |
| 3937 | |
Avi Kivity | 79539ce | 2007-11-21 02:06:21 +0200 | [diff] [blame] | 3938 | static bool need_remote_flush(u64 old, u64 new) |
| 3939 | { |
| 3940 | if (!is_shadow_present_pte(old)) |
| 3941 | return false; |
| 3942 | if (!is_shadow_present_pte(new)) |
| 3943 | return true; |
| 3944 | if ((old ^ new) & PT64_BASE_ADDR_MASK) |
| 3945 | return true; |
Gleb Natapov | 5316622 | 2013-08-05 11:07:14 +0300 | [diff] [blame] | 3946 | old ^= shadow_nx_mask; |
| 3947 | new ^= shadow_nx_mask; |
Avi Kivity | 79539ce | 2007-11-21 02:06:21 +0200 | [diff] [blame] | 3948 | return (old & ~new & PT64_PERM_MASK) != 0; |
| 3949 | } |
| 3950 | |
Xiao Guangrong | 0671a8e | 2010-06-04 21:56:59 +0800 | [diff] [blame] | 3951 | static void mmu_pte_write_flush_tlb(struct kvm_vcpu *vcpu, bool zap_page, |
| 3952 | bool remote_flush, bool local_flush) |
Avi Kivity | 79539ce | 2007-11-21 02:06:21 +0200 | [diff] [blame] | 3953 | { |
Xiao Guangrong | 0671a8e | 2010-06-04 21:56:59 +0800 | [diff] [blame] | 3954 | if (zap_page) |
| 3955 | return; |
| 3956 | |
| 3957 | if (remote_flush) |
Avi Kivity | 79539ce | 2007-11-21 02:06:21 +0200 | [diff] [blame] | 3958 | kvm_flush_remote_tlbs(vcpu->kvm); |
Xiao Guangrong | 0671a8e | 2010-06-04 21:56:59 +0800 | [diff] [blame] | 3959 | else if (local_flush) |
Avi Kivity | 79539ce | 2007-11-21 02:06:21 +0200 | [diff] [blame] | 3960 | kvm_mmu_flush_tlb(vcpu); |
| 3961 | } |
| 3962 | |
Xiao Guangrong | 889e5cb | 2011-09-22 16:57:23 +0800 | [diff] [blame] | 3963 | static u64 mmu_pte_write_fetch_gpte(struct kvm_vcpu *vcpu, gpa_t *gpa, |
| 3964 | const u8 *new, int *bytes) |
Avi Kivity | da4a00f | 2007-01-05 16:36:44 -0800 | [diff] [blame] | 3965 | { |
Xiao Guangrong | 889e5cb | 2011-09-22 16:57:23 +0800 | [diff] [blame] | 3966 | u64 gentry; |
| 3967 | int r; |
Avi Kivity | 72016f3 | 2010-03-15 13:59:53 +0200 | [diff] [blame] | 3968 | |
Avi Kivity | 08e850c | 2010-03-15 13:59:57 +0200 | [diff] [blame] | 3969 | /* |
| 3970 | * Assume that the pte write on a page table of the same type |
Xiao Guangrong | 49b26e2 | 2011-03-04 19:00:00 +0800 | [diff] [blame] | 3971 | * as the current vcpu paging mode since we update the sptes only |
| 3972 | * when they have the same mode. |
Avi Kivity | 08e850c | 2010-03-15 13:59:57 +0200 | [diff] [blame] | 3973 | */ |
Xiao Guangrong | 889e5cb | 2011-09-22 16:57:23 +0800 | [diff] [blame] | 3974 | if (is_pae(vcpu) && *bytes == 4) { |
Avi Kivity | 08e850c | 2010-03-15 13:59:57 +0200 | [diff] [blame] | 3975 | /* Handle a 32-bit guest writing two halves of a 64-bit gpte */ |
Xiao Guangrong | 889e5cb | 2011-09-22 16:57:23 +0800 | [diff] [blame] | 3976 | *gpa &= ~(gpa_t)7; |
| 3977 | *bytes = 8; |
Gleb Natapov | 116eb3d | 2013-01-30 16:45:03 +0200 | [diff] [blame] | 3978 | r = kvm_read_guest(vcpu->kvm, *gpa, &gentry, 8); |
Avi Kivity | 08e850c | 2010-03-15 13:59:57 +0200 | [diff] [blame] | 3979 | if (r) |
| 3980 | gentry = 0; |
| 3981 | new = (const u8 *)&gentry; |
| 3982 | } |
| 3983 | |
Xiao Guangrong | 889e5cb | 2011-09-22 16:57:23 +0800 | [diff] [blame] | 3984 | switch (*bytes) { |
Avi Kivity | 72016f3 | 2010-03-15 13:59:53 +0200 | [diff] [blame] | 3985 | case 4: |
| 3986 | gentry = *(const u32 *)new; |
| 3987 | break; |
| 3988 | case 8: |
| 3989 | gentry = *(const u64 *)new; |
| 3990 | break; |
| 3991 | default: |
| 3992 | gentry = 0; |
| 3993 | break; |
| 3994 | } |
| 3995 | |
Xiao Guangrong | 889e5cb | 2011-09-22 16:57:23 +0800 | [diff] [blame] | 3996 | return gentry; |
| 3997 | } |
| 3998 | |
| 3999 | /* |
| 4000 | * If we're seeing too many writes to a page, it may no longer be a page table, |
| 4001 | * or we may be forking, in which case it is better to unmap the page. |
| 4002 | */ |
Xiao Guangrong | a138fe7 | 2011-12-16 18:18:10 +0800 | [diff] [blame] | 4003 | static bool detect_write_flooding(struct kvm_mmu_page *sp) |
Xiao Guangrong | 889e5cb | 2011-09-22 16:57:23 +0800 | [diff] [blame] | 4004 | { |
Xiao Guangrong | a30f47c | 2011-09-22 16:58:36 +0800 | [diff] [blame] | 4005 | /* |
| 4006 | * Skip write-flooding detected for the sp whose level is 1, because |
| 4007 | * it can become unsync, then the guest page is not write-protected. |
| 4008 | */ |
Davidlohr Bueso | f71fa31 | 2012-04-18 12:24:29 +0200 | [diff] [blame] | 4009 | if (sp->role.level == PT_PAGE_TABLE_LEVEL) |
Xiao Guangrong | a30f47c | 2011-09-22 16:58:36 +0800 | [diff] [blame] | 4010 | return false; |
Xiao Guangrong | 889e5cb | 2011-09-22 16:57:23 +0800 | [diff] [blame] | 4011 | |
Xiao Guangrong | a30f47c | 2011-09-22 16:58:36 +0800 | [diff] [blame] | 4012 | return ++sp->write_flooding_count >= 3; |
Xiao Guangrong | 889e5cb | 2011-09-22 16:57:23 +0800 | [diff] [blame] | 4013 | } |
| 4014 | |
| 4015 | /* |
| 4016 | * Misaligned accesses are too much trouble to fix up; also, they usually |
| 4017 | * indicate a page is not used as a page table. |
| 4018 | */ |
| 4019 | static bool detect_write_misaligned(struct kvm_mmu_page *sp, gpa_t gpa, |
| 4020 | int bytes) |
| 4021 | { |
| 4022 | unsigned offset, pte_size, misaligned; |
| 4023 | |
| 4024 | pgprintk("misaligned: gpa %llx bytes %d role %x\n", |
| 4025 | gpa, bytes, sp->role.word); |
| 4026 | |
| 4027 | offset = offset_in_page(gpa); |
| 4028 | pte_size = sp->role.cr4_pae ? 8 : 4; |
Xiao Guangrong | 5d9ca30 | 2011-09-22 16:57:55 +0800 | [diff] [blame] | 4029 | |
| 4030 | /* |
| 4031 | * Sometimes, the OS only writes the last one bytes to update status |
| 4032 | * bits, for example, in linux, andb instruction is used in clear_bit(). |
| 4033 | */ |
| 4034 | if (!(offset & (pte_size - 1)) && bytes == 1) |
| 4035 | return false; |
| 4036 | |
Xiao Guangrong | 889e5cb | 2011-09-22 16:57:23 +0800 | [diff] [blame] | 4037 | misaligned = (offset ^ (offset + bytes - 1)) & ~(pte_size - 1); |
| 4038 | misaligned |= bytes < 4; |
| 4039 | |
| 4040 | return misaligned; |
| 4041 | } |
| 4042 | |
| 4043 | static u64 *get_written_sptes(struct kvm_mmu_page *sp, gpa_t gpa, int *nspte) |
| 4044 | { |
| 4045 | unsigned page_offset, quadrant; |
| 4046 | u64 *spte; |
| 4047 | int level; |
| 4048 | |
| 4049 | page_offset = offset_in_page(gpa); |
| 4050 | level = sp->role.level; |
| 4051 | *nspte = 1; |
| 4052 | if (!sp->role.cr4_pae) { |
| 4053 | page_offset <<= 1; /* 32->64 */ |
| 4054 | /* |
| 4055 | * A 32-bit pde maps 4MB while the shadow pdes map |
| 4056 | * only 2MB. So we need to double the offset again |
| 4057 | * and zap two pdes instead of one. |
| 4058 | */ |
| 4059 | if (level == PT32_ROOT_LEVEL) { |
| 4060 | page_offset &= ~7; /* kill rounding error */ |
| 4061 | page_offset <<= 1; |
| 4062 | *nspte = 2; |
| 4063 | } |
| 4064 | quadrant = page_offset >> PAGE_SHIFT; |
| 4065 | page_offset &= ~PAGE_MASK; |
| 4066 | if (quadrant != sp->role.quadrant) |
| 4067 | return NULL; |
| 4068 | } |
| 4069 | |
| 4070 | spte = &sp->spt[page_offset / sizeof(*spte)]; |
| 4071 | return spte; |
| 4072 | } |
| 4073 | |
| 4074 | void kvm_mmu_pte_write(struct kvm_vcpu *vcpu, gpa_t gpa, |
| 4075 | const u8 *new, int bytes) |
| 4076 | { |
| 4077 | gfn_t gfn = gpa >> PAGE_SHIFT; |
| 4078 | union kvm_mmu_page_role mask = { .word = 0 }; |
| 4079 | struct kvm_mmu_page *sp; |
Xiao Guangrong | 889e5cb | 2011-09-22 16:57:23 +0800 | [diff] [blame] | 4080 | LIST_HEAD(invalid_list); |
| 4081 | u64 entry, gentry, *spte; |
| 4082 | int npte; |
Xiao Guangrong | a30f47c | 2011-09-22 16:58:36 +0800 | [diff] [blame] | 4083 | bool remote_flush, local_flush, zap_page; |
Xiao Guangrong | 889e5cb | 2011-09-22 16:57:23 +0800 | [diff] [blame] | 4084 | |
| 4085 | /* |
| 4086 | * If we don't have indirect shadow pages, it means no page is |
| 4087 | * write-protected, so we can exit simply. |
| 4088 | */ |
| 4089 | if (!ACCESS_ONCE(vcpu->kvm->arch.indirect_shadow_pages)) |
| 4090 | return; |
| 4091 | |
| 4092 | zap_page = remote_flush = local_flush = false; |
| 4093 | |
| 4094 | pgprintk("%s: gpa %llx bytes %d\n", __func__, gpa, bytes); |
| 4095 | |
| 4096 | gentry = mmu_pte_write_fetch_gpte(vcpu, &gpa, new, &bytes); |
| 4097 | |
| 4098 | /* |
| 4099 | * No need to care whether allocation memory is successful |
| 4100 | * or not since pte prefetch is skiped if it does not have |
| 4101 | * enough objects in the cache. |
| 4102 | */ |
| 4103 | mmu_topup_memory_caches(vcpu); |
| 4104 | |
| 4105 | spin_lock(&vcpu->kvm->mmu_lock); |
| 4106 | ++vcpu->kvm->stat.mmu_pte_write; |
Xiao Guangrong | 0375f7f | 2011-11-28 20:41:00 +0800 | [diff] [blame] | 4107 | kvm_mmu_audit(vcpu, AUDIT_PRE_PTE_WRITE); |
Xiao Guangrong | 889e5cb | 2011-09-22 16:57:23 +0800 | [diff] [blame] | 4108 | |
Xiao Guangrong | fa1de2b | 2010-07-16 11:19:51 +0800 | [diff] [blame] | 4109 | mask.cr0_wp = mask.cr4_pae = mask.nxe = 1; |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 4110 | for_each_gfn_indirect_valid_sp(vcpu->kvm, sp, gfn) { |
Xiao Guangrong | a30f47c | 2011-09-22 16:58:36 +0800 | [diff] [blame] | 4111 | if (detect_write_misaligned(sp, gpa, bytes) || |
Xiao Guangrong | a138fe7 | 2011-12-16 18:18:10 +0800 | [diff] [blame] | 4112 | detect_write_flooding(sp)) { |
Xiao Guangrong | 0671a8e | 2010-06-04 21:56:59 +0800 | [diff] [blame] | 4113 | zap_page |= !!kvm_mmu_prepare_zap_page(vcpu->kvm, sp, |
Xiao Guangrong | f41d335 | 2010-06-04 21:56:11 +0800 | [diff] [blame] | 4114 | &invalid_list); |
Avi Kivity | 4cee576 | 2007-11-18 16:37:07 +0200 | [diff] [blame] | 4115 | ++vcpu->kvm->stat.mmu_flooded; |
Avi Kivity | 0e7bc4b | 2007-01-05 16:36:48 -0800 | [diff] [blame] | 4116 | continue; |
| 4117 | } |
Xiao Guangrong | 889e5cb | 2011-09-22 16:57:23 +0800 | [diff] [blame] | 4118 | |
| 4119 | spte = get_written_sptes(sp, gpa, &npte); |
| 4120 | if (!spte) |
| 4121 | continue; |
| 4122 | |
Xiao Guangrong | 0671a8e | 2010-06-04 21:56:59 +0800 | [diff] [blame] | 4123 | local_flush = true; |
Avi Kivity | ac1b714 | 2007-03-08 17:13:32 +0200 | [diff] [blame] | 4124 | while (npte--) { |
Avi Kivity | 79539ce | 2007-11-21 02:06:21 +0200 | [diff] [blame] | 4125 | entry = *spte; |
Xiao Guangrong | 38e3b2b | 2011-05-15 23:27:52 +0800 | [diff] [blame] | 4126 | mmu_page_zap_pte(vcpu->kvm, sp, spte); |
Xiao Guangrong | fa1de2b | 2010-07-16 11:19:51 +0800 | [diff] [blame] | 4127 | if (gentry && |
| 4128 | !((sp->role.word ^ vcpu->arch.mmu.base_role.word) |
Xiao Guangrong | f759e2b | 2011-09-22 16:53:17 +0800 | [diff] [blame] | 4129 | & mask.word) && rmap_can_add(vcpu)) |
Xiao Guangrong | 7c56252 | 2011-03-28 10:29:27 +0800 | [diff] [blame] | 4130 | mmu_pte_write_new_pte(vcpu, sp, spte, &gentry); |
Gleb Natapov | 9bb4f6b | 2013-01-30 16:45:01 +0200 | [diff] [blame] | 4131 | if (need_remote_flush(entry, *spte)) |
Xiao Guangrong | 0671a8e | 2010-06-04 21:56:59 +0800 | [diff] [blame] | 4132 | remote_flush = true; |
Avi Kivity | ac1b714 | 2007-03-08 17:13:32 +0200 | [diff] [blame] | 4133 | ++spte; |
Avi Kivity | 9b7a032 | 2007-01-05 16:36:45 -0800 | [diff] [blame] | 4134 | } |
Avi Kivity | 9b7a032 | 2007-01-05 16:36:45 -0800 | [diff] [blame] | 4135 | } |
Xiao Guangrong | 0671a8e | 2010-06-04 21:56:59 +0800 | [diff] [blame] | 4136 | mmu_pte_write_flush_tlb(vcpu, zap_page, remote_flush, local_flush); |
Xiao Guangrong | d98ba05 | 2010-06-04 21:55:29 +0800 | [diff] [blame] | 4137 | kvm_mmu_commit_zap_page(vcpu->kvm, &invalid_list); |
Xiao Guangrong | 0375f7f | 2011-11-28 20:41:00 +0800 | [diff] [blame] | 4138 | kvm_mmu_audit(vcpu, AUDIT_POST_PTE_WRITE); |
Marcelo Tosatti | aaee2c9 | 2007-12-20 19:18:26 -0500 | [diff] [blame] | 4139 | spin_unlock(&vcpu->kvm->mmu_lock); |
Avi Kivity | da4a00f | 2007-01-05 16:36:44 -0800 | [diff] [blame] | 4140 | } |
| 4141 | |
Avi Kivity | a436036 | 2007-01-05 16:36:45 -0800 | [diff] [blame] | 4142 | int kvm_mmu_unprotect_page_virt(struct kvm_vcpu *vcpu, gva_t gva) |
| 4143 | { |
Marcelo Tosatti | 10589a4 | 2007-12-20 19:18:22 -0500 | [diff] [blame] | 4144 | gpa_t gpa; |
| 4145 | int r; |
Avi Kivity | a436036 | 2007-01-05 16:36:45 -0800 | [diff] [blame] | 4146 | |
Joerg Roedel | c5a78f2b | 2010-09-10 17:30:39 +0200 | [diff] [blame] | 4147 | if (vcpu->arch.mmu.direct_map) |
Avi Kivity | 60f2478 | 2009-08-27 13:37:06 +0300 | [diff] [blame] | 4148 | return 0; |
| 4149 | |
Gleb Natapov | 1871c60 | 2010-02-10 14:21:32 +0200 | [diff] [blame] | 4150 | gpa = kvm_mmu_gva_to_gpa_read(vcpu, gva, NULL); |
Marcelo Tosatti | 10589a4 | 2007-12-20 19:18:22 -0500 | [diff] [blame] | 4151 | |
Marcelo Tosatti | 10589a4 | 2007-12-20 19:18:22 -0500 | [diff] [blame] | 4152 | r = kvm_mmu_unprotect_page(vcpu->kvm, gpa >> PAGE_SHIFT); |
Xiao Guangrong | 1cb3f3a | 2011-09-22 17:02:48 +0800 | [diff] [blame] | 4153 | |
Marcelo Tosatti | 10589a4 | 2007-12-20 19:18:22 -0500 | [diff] [blame] | 4154 | return r; |
Avi Kivity | a436036 | 2007-01-05 16:36:45 -0800 | [diff] [blame] | 4155 | } |
Avi Kivity | 577bdc4 | 2008-07-19 08:57:05 +0300 | [diff] [blame] | 4156 | EXPORT_SYMBOL_GPL(kvm_mmu_unprotect_page_virt); |
Avi Kivity | a436036 | 2007-01-05 16:36:45 -0800 | [diff] [blame] | 4157 | |
Takuya Yoshikawa | 81f4f76 | 2013-03-21 19:34:27 +0900 | [diff] [blame] | 4158 | static void make_mmu_pages_available(struct kvm_vcpu *vcpu) |
Avi Kivity | ebeace8 | 2007-01-05 16:36:47 -0800 | [diff] [blame] | 4159 | { |
Xiao Guangrong | d98ba05 | 2010-06-04 21:55:29 +0800 | [diff] [blame] | 4160 | LIST_HEAD(invalid_list); |
Xiao Guangrong | 103ad25 | 2010-06-04 21:54:38 +0800 | [diff] [blame] | 4161 | |
Takuya Yoshikawa | 81f4f76 | 2013-03-21 19:34:27 +0900 | [diff] [blame] | 4162 | if (likely(kvm_mmu_available_pages(vcpu->kvm) >= KVM_MIN_FREE_MMU_PAGES)) |
| 4163 | return; |
| 4164 | |
Takuya Yoshikawa | 5da5960 | 2013-03-06 16:06:58 +0900 | [diff] [blame] | 4165 | while (kvm_mmu_available_pages(vcpu->kvm) < KVM_REFILL_PAGES) { |
| 4166 | if (!prepare_zap_oldest_mmu_page(vcpu->kvm, &invalid_list)) |
| 4167 | break; |
Avi Kivity | ebeace8 | 2007-01-05 16:36:47 -0800 | [diff] [blame] | 4168 | |
Avi Kivity | 4cee576 | 2007-11-18 16:37:07 +0200 | [diff] [blame] | 4169 | ++vcpu->kvm->stat.mmu_recycled; |
Avi Kivity | ebeace8 | 2007-01-05 16:36:47 -0800 | [diff] [blame] | 4170 | } |
Xiao Guangrong | aa6bd18 | 2011-07-12 03:26:40 +0800 | [diff] [blame] | 4171 | kvm_mmu_commit_zap_page(vcpu->kvm, &invalid_list); |
Avi Kivity | ebeace8 | 2007-01-05 16:36:47 -0800 | [diff] [blame] | 4172 | } |
Avi Kivity | ebeace8 | 2007-01-05 16:36:47 -0800 | [diff] [blame] | 4173 | |
Xiao Guangrong | 1cb3f3a | 2011-09-22 17:02:48 +0800 | [diff] [blame] | 4174 | static bool is_mmio_page_fault(struct kvm_vcpu *vcpu, gva_t addr) |
| 4175 | { |
| 4176 | if (vcpu->arch.mmu.direct_map || mmu_is_nested(vcpu)) |
| 4177 | return vcpu_match_mmio_gpa(vcpu, addr); |
| 4178 | |
| 4179 | return vcpu_match_mmio_gva(vcpu, addr); |
| 4180 | } |
| 4181 | |
Andre Przywara | dc25e89 | 2010-12-21 11:12:07 +0100 | [diff] [blame] | 4182 | int kvm_mmu_page_fault(struct kvm_vcpu *vcpu, gva_t cr2, u32 error_code, |
| 4183 | void *insn, int insn_len) |
Avi Kivity | 3067714 | 2007-10-28 18:48:59 +0200 | [diff] [blame] | 4184 | { |
Xiao Guangrong | 1cb3f3a | 2011-09-22 17:02:48 +0800 | [diff] [blame] | 4185 | int r, emulation_type = EMULTYPE_RETRY; |
Avi Kivity | 3067714 | 2007-10-28 18:48:59 +0200 | [diff] [blame] | 4186 | enum emulation_result er; |
| 4187 | |
Gleb Natapov | 56028d0 | 2010-10-17 18:13:42 +0200 | [diff] [blame] | 4188 | r = vcpu->arch.mmu.page_fault(vcpu, cr2, error_code, false); |
Avi Kivity | 3067714 | 2007-10-28 18:48:59 +0200 | [diff] [blame] | 4189 | if (r < 0) |
| 4190 | goto out; |
| 4191 | |
| 4192 | if (!r) { |
| 4193 | r = 1; |
| 4194 | goto out; |
| 4195 | } |
| 4196 | |
Xiao Guangrong | 1cb3f3a | 2011-09-22 17:02:48 +0800 | [diff] [blame] | 4197 | if (is_mmio_page_fault(vcpu, cr2)) |
| 4198 | emulation_type = 0; |
| 4199 | |
| 4200 | er = x86_emulate_instruction(vcpu, cr2, emulation_type, insn, insn_len); |
Avi Kivity | 3067714 | 2007-10-28 18:48:59 +0200 | [diff] [blame] | 4201 | |
| 4202 | switch (er) { |
| 4203 | case EMULATE_DONE: |
| 4204 | return 1; |
Paolo Bonzini | ac0a48c | 2013-06-25 18:24:41 +0200 | [diff] [blame] | 4205 | case EMULATE_USER_EXIT: |
Avi Kivity | 3067714 | 2007-10-28 18:48:59 +0200 | [diff] [blame] | 4206 | ++vcpu->stat.mmio_exits; |
Gleb Natapov | 6d77dbf | 2010-05-10 11:16:56 +0300 | [diff] [blame] | 4207 | /* fall through */ |
Avi Kivity | 3067714 | 2007-10-28 18:48:59 +0200 | [diff] [blame] | 4208 | case EMULATE_FAIL: |
Avi Kivity | 3f5d18a | 2009-06-11 15:43:28 +0300 | [diff] [blame] | 4209 | return 0; |
Avi Kivity | 3067714 | 2007-10-28 18:48:59 +0200 | [diff] [blame] | 4210 | default: |
| 4211 | BUG(); |
| 4212 | } |
| 4213 | out: |
Avi Kivity | 3067714 | 2007-10-28 18:48:59 +0200 | [diff] [blame] | 4214 | return r; |
| 4215 | } |
| 4216 | EXPORT_SYMBOL_GPL(kvm_mmu_page_fault); |
| 4217 | |
Marcelo Tosatti | a705289 | 2008-09-23 13:18:35 -0300 | [diff] [blame] | 4218 | void kvm_mmu_invlpg(struct kvm_vcpu *vcpu, gva_t gva) |
| 4219 | { |
Marcelo Tosatti | a705289 | 2008-09-23 13:18:35 -0300 | [diff] [blame] | 4220 | vcpu->arch.mmu.invlpg(vcpu, gva); |
Marcelo Tosatti | a705289 | 2008-09-23 13:18:35 -0300 | [diff] [blame] | 4221 | kvm_mmu_flush_tlb(vcpu); |
| 4222 | ++vcpu->stat.invlpg; |
| 4223 | } |
| 4224 | EXPORT_SYMBOL_GPL(kvm_mmu_invlpg); |
| 4225 | |
Joerg Roedel | 1855267 | 2008-02-07 13:47:41 +0100 | [diff] [blame] | 4226 | void kvm_enable_tdp(void) |
| 4227 | { |
| 4228 | tdp_enabled = true; |
| 4229 | } |
| 4230 | EXPORT_SYMBOL_GPL(kvm_enable_tdp); |
| 4231 | |
Joerg Roedel | 5f4cb66 | 2008-07-14 20:36:36 +0200 | [diff] [blame] | 4232 | void kvm_disable_tdp(void) |
| 4233 | { |
| 4234 | tdp_enabled = false; |
| 4235 | } |
| 4236 | EXPORT_SYMBOL_GPL(kvm_disable_tdp); |
| 4237 | |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 4238 | static void free_mmu_pages(struct kvm_vcpu *vcpu) |
| 4239 | { |
Zhang Xiantao | ad312c7 | 2007-12-13 23:50:52 +0800 | [diff] [blame] | 4240 | free_page((unsigned long)vcpu->arch.mmu.pae_root); |
Joerg Roedel | 81407ca | 2010-09-10 17:31:00 +0200 | [diff] [blame] | 4241 | if (vcpu->arch.mmu.lm_root != NULL) |
| 4242 | free_page((unsigned long)vcpu->arch.mmu.lm_root); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 4243 | } |
| 4244 | |
| 4245 | static int alloc_mmu_pages(struct kvm_vcpu *vcpu) |
| 4246 | { |
Avi Kivity | 17ac10a | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 4247 | struct page *page; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 4248 | int i; |
| 4249 | |
| 4250 | ASSERT(vcpu); |
| 4251 | |
Avi Kivity | 17ac10a | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 4252 | /* |
| 4253 | * When emulating 32-bit mode, cr3 is only 32 bits even on x86_64. |
| 4254 | * Therefore we need to allocate shadow page tables in the first |
| 4255 | * 4GB of memory, which happens to fit the DMA32 zone. |
| 4256 | */ |
| 4257 | page = alloc_page(GFP_KERNEL | __GFP_DMA32); |
| 4258 | if (!page) |
Wei Yongjun | d7fa6ab | 2010-01-22 16:55:05 +0800 | [diff] [blame] | 4259 | return -ENOMEM; |
| 4260 | |
Zhang Xiantao | ad312c7 | 2007-12-13 23:50:52 +0800 | [diff] [blame] | 4261 | vcpu->arch.mmu.pae_root = page_address(page); |
Avi Kivity | 17ac10a | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 4262 | for (i = 0; i < 4; ++i) |
Zhang Xiantao | ad312c7 | 2007-12-13 23:50:52 +0800 | [diff] [blame] | 4263 | vcpu->arch.mmu.pae_root[i] = INVALID_PAGE; |
Avi Kivity | 17ac10a | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 4264 | |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 4265 | return 0; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 4266 | } |
| 4267 | |
Ingo Molnar | 8018c27 | 2006-12-29 16:50:01 -0800 | [diff] [blame] | 4268 | int kvm_mmu_create(struct kvm_vcpu *vcpu) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 4269 | { |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 4270 | ASSERT(vcpu); |
Xiao Guangrong | e459e32 | 2011-11-28 20:42:16 +0800 | [diff] [blame] | 4271 | |
| 4272 | vcpu->arch.walk_mmu = &vcpu->arch.mmu; |
| 4273 | vcpu->arch.mmu.root_hpa = INVALID_PAGE; |
| 4274 | vcpu->arch.mmu.translate_gpa = translate_gpa; |
| 4275 | vcpu->arch.nested_mmu.translate_gpa = translate_nested_gpa; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 4276 | |
Ingo Molnar | 8018c27 | 2006-12-29 16:50:01 -0800 | [diff] [blame] | 4277 | return alloc_mmu_pages(vcpu); |
| 4278 | } |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 4279 | |
Paolo Bonzini | 8a3c1a33 | 2013-10-02 16:56:13 +0200 | [diff] [blame] | 4280 | void kvm_mmu_setup(struct kvm_vcpu *vcpu) |
Ingo Molnar | 8018c27 | 2006-12-29 16:50:01 -0800 | [diff] [blame] | 4281 | { |
| 4282 | ASSERT(vcpu); |
Zhang Xiantao | ad312c7 | 2007-12-13 23:50:52 +0800 | [diff] [blame] | 4283 | ASSERT(!VALID_PAGE(vcpu->arch.mmu.root_hpa)); |
Avi Kivity | 2c26495 | 2006-12-22 01:05:28 -0800 | [diff] [blame] | 4284 | |
Paolo Bonzini | 8a3c1a33 | 2013-10-02 16:56:13 +0200 | [diff] [blame] | 4285 | init_kvm_mmu(vcpu); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 4286 | } |
| 4287 | |
Avi Kivity | 90cb052 | 2007-07-17 13:04:56 +0300 | [diff] [blame] | 4288 | void kvm_mmu_slot_remove_write_access(struct kvm *kvm, int slot) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 4289 | { |
Takuya Yoshikawa | b99db1d | 2013-01-08 19:44:48 +0900 | [diff] [blame] | 4290 | struct kvm_memory_slot *memslot; |
| 4291 | gfn_t last_gfn; |
| 4292 | int i; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 4293 | |
Takuya Yoshikawa | b99db1d | 2013-01-08 19:44:48 +0900 | [diff] [blame] | 4294 | memslot = id_to_memslot(kvm->memslots, slot); |
| 4295 | last_gfn = memslot->base_gfn + memslot->npages - 1; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 4296 | |
Takuya Yoshikawa | 9d1beef | 2013-01-08 19:46:48 +0900 | [diff] [blame] | 4297 | spin_lock(&kvm->mmu_lock); |
| 4298 | |
Takuya Yoshikawa | b99db1d | 2013-01-08 19:44:48 +0900 | [diff] [blame] | 4299 | for (i = PT_PAGE_TABLE_LEVEL; |
| 4300 | i < PT_PAGE_TABLE_LEVEL + KVM_NR_PAGE_SIZES; ++i) { |
| 4301 | unsigned long *rmapp; |
| 4302 | unsigned long last_index, index; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 4303 | |
Takuya Yoshikawa | b99db1d | 2013-01-08 19:44:48 +0900 | [diff] [blame] | 4304 | rmapp = memslot->arch.rmap[i - PT_PAGE_TABLE_LEVEL]; |
| 4305 | last_index = gfn_to_index(last_gfn, memslot->base_gfn, i); |
Xiao Guangrong | da8dc75 | 2011-03-04 18:56:41 +0800 | [diff] [blame] | 4306 | |
Takuya Yoshikawa | b99db1d | 2013-01-08 19:44:48 +0900 | [diff] [blame] | 4307 | for (index = 0; index <= last_index; ++index, ++rmapp) { |
| 4308 | if (*rmapp) |
| 4309 | __rmap_write_protect(kvm, rmapp, false); |
Takuya Yoshikawa | 6b81b05 | 2013-01-08 19:47:33 +0900 | [diff] [blame] | 4310 | |
Xiao Guangrong | 198c74f | 2014-04-17 17:06:16 +0800 | [diff] [blame] | 4311 | if (need_resched() || spin_needbreak(&kvm->mmu_lock)) |
Takuya Yoshikawa | 6b81b05 | 2013-01-08 19:47:33 +0900 | [diff] [blame] | 4312 | cond_resched_lock(&kvm->mmu_lock); |
Avi Kivity | 8234b22 | 2010-12-27 12:08:45 +0200 | [diff] [blame] | 4313 | } |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 4314 | } |
Takuya Yoshikawa | b99db1d | 2013-01-08 19:44:48 +0900 | [diff] [blame] | 4315 | |
Takuya Yoshikawa | 9d1beef | 2013-01-08 19:46:48 +0900 | [diff] [blame] | 4316 | spin_unlock(&kvm->mmu_lock); |
Xiao Guangrong | 198c74f | 2014-04-17 17:06:16 +0800 | [diff] [blame] | 4317 | |
| 4318 | /* |
| 4319 | * kvm_mmu_slot_remove_write_access() and kvm_vm_ioctl_get_dirty_log() |
| 4320 | * which do tlb flush out of mmu-lock should be serialized by |
| 4321 | * kvm->slots_lock otherwise tlb flush would be missed. |
| 4322 | */ |
| 4323 | lockdep_assert_held(&kvm->slots_lock); |
| 4324 | |
| 4325 | /* |
| 4326 | * We can flush all the TLBs out of the mmu lock without TLB |
| 4327 | * corruption since we just change the spte from writable to |
| 4328 | * readonly so that we only need to care the case of changing |
| 4329 | * spte from present to present (changing the spte from present |
| 4330 | * to nonpresent will flush all the TLBs immediately), in other |
| 4331 | * words, the only case we care is mmu_spte_update() where we |
| 4332 | * haved checked SPTE_HOST_WRITEABLE | SPTE_MMU_WRITEABLE |
| 4333 | * instead of PT_WRITABLE_MASK, that means it does not depend |
| 4334 | * on PT_WRITABLE_MASK anymore. |
| 4335 | */ |
| 4336 | kvm_flush_remote_tlbs(kvm); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 4337 | } |
Avi Kivity | 37a7d8b | 2007-01-05 16:36:56 -0800 | [diff] [blame] | 4338 | |
Xiao Guangrong | e7d11c7 | 2013-05-31 08:36:27 +0800 | [diff] [blame] | 4339 | #define BATCH_ZAP_PAGES 10 |
Xiao Guangrong | 5304b8d | 2013-05-31 08:36:22 +0800 | [diff] [blame] | 4340 | static void kvm_zap_obsolete_pages(struct kvm *kvm) |
| 4341 | { |
| 4342 | struct kvm_mmu_page *sp, *node; |
Xiao Guangrong | e7d11c7 | 2013-05-31 08:36:27 +0800 | [diff] [blame] | 4343 | int batch = 0; |
Xiao Guangrong | 5304b8d | 2013-05-31 08:36:22 +0800 | [diff] [blame] | 4344 | |
| 4345 | restart: |
| 4346 | list_for_each_entry_safe_reverse(sp, node, |
| 4347 | &kvm->arch.active_mmu_pages, link) { |
Xiao Guangrong | e7d11c7 | 2013-05-31 08:36:27 +0800 | [diff] [blame] | 4348 | int ret; |
| 4349 | |
Xiao Guangrong | 5304b8d | 2013-05-31 08:36:22 +0800 | [diff] [blame] | 4350 | /* |
| 4351 | * No obsolete page exists before new created page since |
| 4352 | * active_mmu_pages is the FIFO list. |
| 4353 | */ |
| 4354 | if (!is_obsolete_sp(kvm, sp)) |
| 4355 | break; |
| 4356 | |
| 4357 | /* |
Xiao Guangrong | 5304b8d | 2013-05-31 08:36:22 +0800 | [diff] [blame] | 4358 | * Since we are reversely walking the list and the invalid |
| 4359 | * list will be moved to the head, skip the invalid page |
| 4360 | * can help us to avoid the infinity list walking. |
| 4361 | */ |
| 4362 | if (sp->role.invalid) |
| 4363 | continue; |
| 4364 | |
Xiao Guangrong | f34d251 | 2013-05-31 08:36:28 +0800 | [diff] [blame] | 4365 | /* |
| 4366 | * Need not flush tlb since we only zap the sp with invalid |
| 4367 | * generation number. |
| 4368 | */ |
Xiao Guangrong | e7d11c7 | 2013-05-31 08:36:27 +0800 | [diff] [blame] | 4369 | if (batch >= BATCH_ZAP_PAGES && |
Xiao Guangrong | f34d251 | 2013-05-31 08:36:28 +0800 | [diff] [blame] | 4370 | cond_resched_lock(&kvm->mmu_lock)) { |
Xiao Guangrong | e7d11c7 | 2013-05-31 08:36:27 +0800 | [diff] [blame] | 4371 | batch = 0; |
Xiao Guangrong | 5304b8d | 2013-05-31 08:36:22 +0800 | [diff] [blame] | 4372 | goto restart; |
| 4373 | } |
| 4374 | |
Xiao Guangrong | 365c886 | 2013-05-31 08:36:29 +0800 | [diff] [blame] | 4375 | ret = kvm_mmu_prepare_zap_page(kvm, sp, |
| 4376 | &kvm->arch.zapped_obsolete_pages); |
Xiao Guangrong | e7d11c7 | 2013-05-31 08:36:27 +0800 | [diff] [blame] | 4377 | batch += ret; |
| 4378 | |
| 4379 | if (ret) |
Xiao Guangrong | 5304b8d | 2013-05-31 08:36:22 +0800 | [diff] [blame] | 4380 | goto restart; |
| 4381 | } |
| 4382 | |
Xiao Guangrong | f34d251 | 2013-05-31 08:36:28 +0800 | [diff] [blame] | 4383 | /* |
| 4384 | * Should flush tlb before free page tables since lockless-walking |
| 4385 | * may use the pages. |
| 4386 | */ |
Xiao Guangrong | 365c886 | 2013-05-31 08:36:29 +0800 | [diff] [blame] | 4387 | kvm_mmu_commit_zap_page(kvm, &kvm->arch.zapped_obsolete_pages); |
Xiao Guangrong | 5304b8d | 2013-05-31 08:36:22 +0800 | [diff] [blame] | 4388 | } |
| 4389 | |
| 4390 | /* |
| 4391 | * Fast invalidate all shadow pages and use lock-break technique |
| 4392 | * to zap obsolete pages. |
| 4393 | * |
| 4394 | * It's required when memslot is being deleted or VM is being |
| 4395 | * destroyed, in these cases, we should ensure that KVM MMU does |
| 4396 | * not use any resource of the being-deleted slot or all slots |
| 4397 | * after calling the function. |
| 4398 | */ |
| 4399 | void kvm_mmu_invalidate_zap_all_pages(struct kvm *kvm) |
| 4400 | { |
| 4401 | spin_lock(&kvm->mmu_lock); |
Xiao Guangrong | 3500612 | 2013-05-31 08:36:25 +0800 | [diff] [blame] | 4402 | trace_kvm_mmu_invalidate_zap_all_pages(kvm); |
Xiao Guangrong | 5304b8d | 2013-05-31 08:36:22 +0800 | [diff] [blame] | 4403 | kvm->arch.mmu_valid_gen++; |
| 4404 | |
Xiao Guangrong | f34d251 | 2013-05-31 08:36:28 +0800 | [diff] [blame] | 4405 | /* |
| 4406 | * Notify all vcpus to reload its shadow page table |
| 4407 | * and flush TLB. Then all vcpus will switch to new |
| 4408 | * shadow page table with the new mmu_valid_gen. |
| 4409 | * |
| 4410 | * Note: we should do this under the protection of |
| 4411 | * mmu-lock, otherwise, vcpu would purge shadow page |
| 4412 | * but miss tlb flush. |
| 4413 | */ |
| 4414 | kvm_reload_remote_mmus(kvm); |
| 4415 | |
Xiao Guangrong | 5304b8d | 2013-05-31 08:36:22 +0800 | [diff] [blame] | 4416 | kvm_zap_obsolete_pages(kvm); |
| 4417 | spin_unlock(&kvm->mmu_lock); |
| 4418 | } |
| 4419 | |
Xiao Guangrong | 365c886 | 2013-05-31 08:36:29 +0800 | [diff] [blame] | 4420 | static bool kvm_has_zapped_obsolete_pages(struct kvm *kvm) |
| 4421 | { |
| 4422 | return unlikely(!list_empty_careful(&kvm->arch.zapped_obsolete_pages)); |
| 4423 | } |
| 4424 | |
Xiao Guangrong | f8f5594 | 2013-06-07 16:51:26 +0800 | [diff] [blame] | 4425 | void kvm_mmu_invalidate_mmio_sptes(struct kvm *kvm) |
| 4426 | { |
| 4427 | /* |
| 4428 | * The very rare case: if the generation-number is round, |
| 4429 | * zap all shadow pages. |
Xiao Guangrong | f8f5594 | 2013-06-07 16:51:26 +0800 | [diff] [blame] | 4430 | */ |
Takuya Yoshikawa | e6dff7d | 2013-07-04 13:41:26 +0900 | [diff] [blame] | 4431 | if (unlikely(kvm_current_mmio_generation(kvm) >= MMIO_MAX_GEN)) { |
Takuya Yoshikawa | 7a2e8aa | 2013-06-21 01:34:31 +0900 | [diff] [blame] | 4432 | printk_ratelimited(KERN_INFO "kvm: zapping shadow pages for mmio generation wraparound\n"); |
Xiao Guangrong | a8eca9d | 2013-06-10 16:28:55 +0800 | [diff] [blame] | 4433 | kvm_mmu_invalidate_zap_all_pages(kvm); |
Takuya Yoshikawa | 7a2e8aa | 2013-06-21 01:34:31 +0900 | [diff] [blame] | 4434 | } |
Xiao Guangrong | f8f5594 | 2013-06-07 16:51:26 +0800 | [diff] [blame] | 4435 | } |
| 4436 | |
Dave Chinner | 70534a7 | 2013-08-28 10:18:14 +1000 | [diff] [blame] | 4437 | static unsigned long |
| 4438 | mmu_shrink_scan(struct shrinker *shrink, struct shrink_control *sc) |
Izik Eidus | 3ee16c8 | 2008-03-30 15:17:21 +0300 | [diff] [blame] | 4439 | { |
| 4440 | struct kvm *kvm; |
Ying Han | 1495f23 | 2011-05-24 17:12:27 -0700 | [diff] [blame] | 4441 | int nr_to_scan = sc->nr_to_scan; |
Dave Chinner | 70534a7 | 2013-08-28 10:18:14 +1000 | [diff] [blame] | 4442 | unsigned long freed = 0; |
Izik Eidus | 3ee16c8 | 2008-03-30 15:17:21 +0300 | [diff] [blame] | 4443 | |
Paolo Bonzini | 2f303b7 | 2013-09-25 13:53:07 +0200 | [diff] [blame] | 4444 | spin_lock(&kvm_lock); |
Izik Eidus | 3ee16c8 | 2008-03-30 15:17:21 +0300 | [diff] [blame] | 4445 | |
| 4446 | list_for_each_entry(kvm, &vm_list, vm_list) { |
Jan Kiszka | 3d56cbd | 2011-12-02 18:35:24 +0100 | [diff] [blame] | 4447 | int idx; |
Xiao Guangrong | d98ba05 | 2010-06-04 21:55:29 +0800 | [diff] [blame] | 4448 | LIST_HEAD(invalid_list); |
Izik Eidus | 3ee16c8 | 2008-03-30 15:17:21 +0300 | [diff] [blame] | 4449 | |
Gleb Natapov | 1952639 | 2012-06-04 14:53:23 +0300 | [diff] [blame] | 4450 | /* |
Takuya Yoshikawa | 35f2d16 | 2012-08-20 18:35:39 +0900 | [diff] [blame] | 4451 | * Never scan more than sc->nr_to_scan VM instances. |
| 4452 | * Will not hit this condition practically since we do not try |
| 4453 | * to shrink more than one VM and it is very unlikely to see |
| 4454 | * !n_used_mmu_pages so many times. |
| 4455 | */ |
| 4456 | if (!nr_to_scan--) |
| 4457 | break; |
| 4458 | /* |
Gleb Natapov | 1952639 | 2012-06-04 14:53:23 +0300 | [diff] [blame] | 4459 | * n_used_mmu_pages is accessed without holding kvm->mmu_lock |
| 4460 | * here. We may skip a VM instance errorneosly, but we do not |
| 4461 | * want to shrink a VM that only started to populate its MMU |
| 4462 | * anyway. |
| 4463 | */ |
Xiao Guangrong | 365c886 | 2013-05-31 08:36:29 +0800 | [diff] [blame] | 4464 | if (!kvm->arch.n_used_mmu_pages && |
| 4465 | !kvm_has_zapped_obsolete_pages(kvm)) |
Gleb Natapov | 1952639 | 2012-06-04 14:53:23 +0300 | [diff] [blame] | 4466 | continue; |
Gleb Natapov | 1952639 | 2012-06-04 14:53:23 +0300 | [diff] [blame] | 4467 | |
Marcelo Tosatti | f656ce0 | 2009-12-23 14:35:25 -0200 | [diff] [blame] | 4468 | idx = srcu_read_lock(&kvm->srcu); |
Izik Eidus | 3ee16c8 | 2008-03-30 15:17:21 +0300 | [diff] [blame] | 4469 | spin_lock(&kvm->mmu_lock); |
Izik Eidus | 3ee16c8 | 2008-03-30 15:17:21 +0300 | [diff] [blame] | 4470 | |
Xiao Guangrong | 365c886 | 2013-05-31 08:36:29 +0800 | [diff] [blame] | 4471 | if (kvm_has_zapped_obsolete_pages(kvm)) { |
| 4472 | kvm_mmu_commit_zap_page(kvm, |
| 4473 | &kvm->arch.zapped_obsolete_pages); |
| 4474 | goto unlock; |
| 4475 | } |
| 4476 | |
Dave Chinner | 70534a7 | 2013-08-28 10:18:14 +1000 | [diff] [blame] | 4477 | if (prepare_zap_oldest_mmu_page(kvm, &invalid_list)) |
| 4478 | freed++; |
Xiao Guangrong | d98ba05 | 2010-06-04 21:55:29 +0800 | [diff] [blame] | 4479 | kvm_mmu_commit_zap_page(kvm, &invalid_list); |
Gleb Natapov | 1952639 | 2012-06-04 14:53:23 +0300 | [diff] [blame] | 4480 | |
Xiao Guangrong | 365c886 | 2013-05-31 08:36:29 +0800 | [diff] [blame] | 4481 | unlock: |
Izik Eidus | 3ee16c8 | 2008-03-30 15:17:21 +0300 | [diff] [blame] | 4482 | spin_unlock(&kvm->mmu_lock); |
Marcelo Tosatti | f656ce0 | 2009-12-23 14:35:25 -0200 | [diff] [blame] | 4483 | srcu_read_unlock(&kvm->srcu, idx); |
Gleb Natapov | 1952639 | 2012-06-04 14:53:23 +0300 | [diff] [blame] | 4484 | |
Dave Chinner | 70534a7 | 2013-08-28 10:18:14 +1000 | [diff] [blame] | 4485 | /* |
| 4486 | * unfair on small ones |
| 4487 | * per-vm shrinkers cry out |
| 4488 | * sadness comes quickly |
| 4489 | */ |
Gleb Natapov | 1952639 | 2012-06-04 14:53:23 +0300 | [diff] [blame] | 4490 | list_move_tail(&kvm->vm_list, &vm_list); |
| 4491 | break; |
Izik Eidus | 3ee16c8 | 2008-03-30 15:17:21 +0300 | [diff] [blame] | 4492 | } |
Izik Eidus | 3ee16c8 | 2008-03-30 15:17:21 +0300 | [diff] [blame] | 4493 | |
Paolo Bonzini | 2f303b7 | 2013-09-25 13:53:07 +0200 | [diff] [blame] | 4494 | spin_unlock(&kvm_lock); |
Dave Chinner | 70534a7 | 2013-08-28 10:18:14 +1000 | [diff] [blame] | 4495 | return freed; |
Dave Chinner | 70534a7 | 2013-08-28 10:18:14 +1000 | [diff] [blame] | 4496 | } |
| 4497 | |
| 4498 | static unsigned long |
| 4499 | mmu_shrink_count(struct shrinker *shrink, struct shrink_control *sc) |
| 4500 | { |
Dave Hansen | 45221ab | 2010-08-19 18:11:37 -0700 | [diff] [blame] | 4501 | return percpu_counter_read_positive(&kvm_total_used_mmu_pages); |
Izik Eidus | 3ee16c8 | 2008-03-30 15:17:21 +0300 | [diff] [blame] | 4502 | } |
| 4503 | |
| 4504 | static struct shrinker mmu_shrinker = { |
Dave Chinner | 70534a7 | 2013-08-28 10:18:14 +1000 | [diff] [blame] | 4505 | .count_objects = mmu_shrink_count, |
| 4506 | .scan_objects = mmu_shrink_scan, |
Izik Eidus | 3ee16c8 | 2008-03-30 15:17:21 +0300 | [diff] [blame] | 4507 | .seeks = DEFAULT_SEEKS * 10, |
| 4508 | }; |
| 4509 | |
Ingo Molnar | 2ddfd20 | 2008-05-22 10:37:48 +0200 | [diff] [blame] | 4510 | static void mmu_destroy_caches(void) |
Avi Kivity | b5a33a7 | 2007-04-15 16:31:09 +0300 | [diff] [blame] | 4511 | { |
Xiao Guangrong | 53c07b1 | 2011-05-15 23:26:20 +0800 | [diff] [blame] | 4512 | if (pte_list_desc_cache) |
| 4513 | kmem_cache_destroy(pte_list_desc_cache); |
Avi Kivity | d3d25b0 | 2007-05-30 12:34:53 +0300 | [diff] [blame] | 4514 | if (mmu_page_header_cache) |
| 4515 | kmem_cache_destroy(mmu_page_header_cache); |
Avi Kivity | b5a33a7 | 2007-04-15 16:31:09 +0300 | [diff] [blame] | 4516 | } |
| 4517 | |
| 4518 | int kvm_mmu_module_init(void) |
| 4519 | { |
Xiao Guangrong | 53c07b1 | 2011-05-15 23:26:20 +0800 | [diff] [blame] | 4520 | pte_list_desc_cache = kmem_cache_create("pte_list_desc", |
| 4521 | sizeof(struct pte_list_desc), |
Paul Mundt | 20c2df8 | 2007-07-20 10:11:58 +0900 | [diff] [blame] | 4522 | 0, 0, NULL); |
Xiao Guangrong | 53c07b1 | 2011-05-15 23:26:20 +0800 | [diff] [blame] | 4523 | if (!pte_list_desc_cache) |
Avi Kivity | b5a33a7 | 2007-04-15 16:31:09 +0300 | [diff] [blame] | 4524 | goto nomem; |
| 4525 | |
Avi Kivity | d3d25b0 | 2007-05-30 12:34:53 +0300 | [diff] [blame] | 4526 | mmu_page_header_cache = kmem_cache_create("kvm_mmu_page_header", |
| 4527 | sizeof(struct kvm_mmu_page), |
Paul Mundt | 20c2df8 | 2007-07-20 10:11:58 +0900 | [diff] [blame] | 4528 | 0, 0, NULL); |
Avi Kivity | d3d25b0 | 2007-05-30 12:34:53 +0300 | [diff] [blame] | 4529 | if (!mmu_page_header_cache) |
| 4530 | goto nomem; |
| 4531 | |
Wei Yongjun | 45bf21a | 2010-08-23 16:13:15 +0800 | [diff] [blame] | 4532 | if (percpu_counter_init(&kvm_total_used_mmu_pages, 0)) |
| 4533 | goto nomem; |
| 4534 | |
Izik Eidus | 3ee16c8 | 2008-03-30 15:17:21 +0300 | [diff] [blame] | 4535 | register_shrinker(&mmu_shrinker); |
| 4536 | |
Avi Kivity | b5a33a7 | 2007-04-15 16:31:09 +0300 | [diff] [blame] | 4537 | return 0; |
| 4538 | |
| 4539 | nomem: |
Izik Eidus | 3ee16c8 | 2008-03-30 15:17:21 +0300 | [diff] [blame] | 4540 | mmu_destroy_caches(); |
Avi Kivity | b5a33a7 | 2007-04-15 16:31:09 +0300 | [diff] [blame] | 4541 | return -ENOMEM; |
| 4542 | } |
| 4543 | |
Zhang Xiantao | 3ad82a7 | 2007-11-20 13:11:38 +0800 | [diff] [blame] | 4544 | /* |
| 4545 | * Caculate mmu pages needed for kvm. |
| 4546 | */ |
| 4547 | unsigned int kvm_mmu_calculate_mmu_pages(struct kvm *kvm) |
| 4548 | { |
Zhang Xiantao | 3ad82a7 | 2007-11-20 13:11:38 +0800 | [diff] [blame] | 4549 | unsigned int nr_mmu_pages; |
| 4550 | unsigned int nr_pages = 0; |
Marcelo Tosatti | bc6678a | 2009-12-23 14:35:21 -0200 | [diff] [blame] | 4551 | struct kvm_memslots *slots; |
Xiao Guangrong | be6ba0f | 2011-11-24 17:39:18 +0800 | [diff] [blame] | 4552 | struct kvm_memory_slot *memslot; |
Zhang Xiantao | 3ad82a7 | 2007-11-20 13:11:38 +0800 | [diff] [blame] | 4553 | |
Lai Jiangshan | 90d83dc | 2010-04-19 17:41:23 +0800 | [diff] [blame] | 4554 | slots = kvm_memslots(kvm); |
| 4555 | |
Xiao Guangrong | be6ba0f | 2011-11-24 17:39:18 +0800 | [diff] [blame] | 4556 | kvm_for_each_memslot(memslot, slots) |
| 4557 | nr_pages += memslot->npages; |
Zhang Xiantao | 3ad82a7 | 2007-11-20 13:11:38 +0800 | [diff] [blame] | 4558 | |
| 4559 | nr_mmu_pages = nr_pages * KVM_PERMILLE_MMU_PAGES / 1000; |
| 4560 | nr_mmu_pages = max(nr_mmu_pages, |
| 4561 | (unsigned int) KVM_MIN_ALLOC_MMU_PAGES); |
| 4562 | |
| 4563 | return nr_mmu_pages; |
| 4564 | } |
| 4565 | |
Marcelo Tosatti | 94d8b05 | 2009-06-11 12:07:42 -0300 | [diff] [blame] | 4566 | int kvm_mmu_get_spte_hierarchy(struct kvm_vcpu *vcpu, u64 addr, u64 sptes[4]) |
| 4567 | { |
| 4568 | struct kvm_shadow_walk_iterator iterator; |
Xiao Guangrong | c2a2ac2 | 2011-07-12 03:32:13 +0800 | [diff] [blame] | 4569 | u64 spte; |
Marcelo Tosatti | 94d8b05 | 2009-06-11 12:07:42 -0300 | [diff] [blame] | 4570 | int nr_sptes = 0; |
| 4571 | |
Marcelo Tosatti | 37f6a4e | 2014-01-03 17:09:32 -0200 | [diff] [blame] | 4572 | if (!VALID_PAGE(vcpu->arch.mmu.root_hpa)) |
| 4573 | return nr_sptes; |
| 4574 | |
Xiao Guangrong | c2a2ac2 | 2011-07-12 03:32:13 +0800 | [diff] [blame] | 4575 | walk_shadow_page_lockless_begin(vcpu); |
| 4576 | for_each_shadow_entry_lockless(vcpu, addr, iterator, spte) { |
| 4577 | sptes[iterator.level-1] = spte; |
Marcelo Tosatti | 94d8b05 | 2009-06-11 12:07:42 -0300 | [diff] [blame] | 4578 | nr_sptes++; |
Xiao Guangrong | c2a2ac2 | 2011-07-12 03:32:13 +0800 | [diff] [blame] | 4579 | if (!is_shadow_present_pte(spte)) |
Marcelo Tosatti | 94d8b05 | 2009-06-11 12:07:42 -0300 | [diff] [blame] | 4580 | break; |
| 4581 | } |
Xiao Guangrong | c2a2ac2 | 2011-07-12 03:32:13 +0800 | [diff] [blame] | 4582 | walk_shadow_page_lockless_end(vcpu); |
Marcelo Tosatti | 94d8b05 | 2009-06-11 12:07:42 -0300 | [diff] [blame] | 4583 | |
| 4584 | return nr_sptes; |
| 4585 | } |
| 4586 | EXPORT_SYMBOL_GPL(kvm_mmu_get_spte_hierarchy); |
| 4587 | |
Xiao Guangrong | c42fffe | 2010-09-27 18:07:07 +0800 | [diff] [blame] | 4588 | void kvm_mmu_destroy(struct kvm_vcpu *vcpu) |
| 4589 | { |
| 4590 | ASSERT(vcpu); |
| 4591 | |
Paolo Bonzini | 95f93af | 2013-10-02 16:56:12 +0200 | [diff] [blame] | 4592 | kvm_mmu_unload(vcpu); |
Xiao Guangrong | c42fffe | 2010-09-27 18:07:07 +0800 | [diff] [blame] | 4593 | free_mmu_pages(vcpu); |
| 4594 | mmu_free_memory_caches(vcpu); |
Xiao Guangrong | b034cf0 | 2010-12-23 16:08:35 +0800 | [diff] [blame] | 4595 | } |
| 4596 | |
Xiao Guangrong | b034cf0 | 2010-12-23 16:08:35 +0800 | [diff] [blame] | 4597 | void kvm_mmu_module_exit(void) |
| 4598 | { |
| 4599 | mmu_destroy_caches(); |
| 4600 | percpu_counter_destroy(&kvm_total_used_mmu_pages); |
| 4601 | unregister_shrinker(&mmu_shrinker); |
Xiao Guangrong | c42fffe | 2010-09-27 18:07:07 +0800 | [diff] [blame] | 4602 | mmu_audit_disable(); |
| 4603 | } |