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" |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 25 | |
Avi Kivity | edf8841 | 2007-12-16 11:02:48 +0200 | [diff] [blame] | 26 | #include <linux/kvm_host.h> |
Avi Kivity | e495606 | 2007-06-28 14:15:57 -0400 | [diff] [blame] | 27 | #include <linux/types.h> |
| 28 | #include <linux/string.h> |
| 29 | #include <linux/mm.h> |
| 30 | #include <linux/highmem.h> |
| 31 | #include <linux/module.h> |
Izik Eidus | 448353c | 2007-11-26 14:08:14 +0200 | [diff] [blame] | 32 | #include <linux/swap.h> |
Marcelo Tosatti | 05da455 | 2008-02-23 11:44:30 -0300 | [diff] [blame] | 33 | #include <linux/hugetlb.h> |
Marcelo Tosatti | 2f333bc | 2008-02-22 12:21:37 -0500 | [diff] [blame] | 34 | #include <linux/compiler.h> |
Marcelo Tosatti | bc6678a | 2009-12-23 14:35:21 -0200 | [diff] [blame] | 35 | #include <linux/srcu.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 36 | #include <linux/slab.h> |
Huang Ying | bf99815 | 2010-05-31 14:28:19 +0800 | [diff] [blame] | 37 | #include <linux/uaccess.h> |
Avi Kivity | e495606 | 2007-06-28 14:15:57 -0400 | [diff] [blame] | 38 | |
| 39 | #include <asm/page.h> |
| 40 | #include <asm/cmpxchg.h> |
Avi Kivity | 4e54237 | 2007-11-21 14:08:40 +0200 | [diff] [blame] | 41 | #include <asm/io.h> |
Eduardo Habkost | 13673a9 | 2008-11-17 19:03:13 -0200 | [diff] [blame] | 42 | #include <asm/vmx.h> |
Avi Kivity | e495606 | 2007-06-28 14:15:57 -0400 | [diff] [blame] | 43 | |
Joerg Roedel | 1855267 | 2008-02-07 13:47:41 +0100 | [diff] [blame] | 44 | /* |
| 45 | * When setting this variable to true it enables Two-Dimensional-Paging |
| 46 | * where the hardware walks 2 page tables: |
| 47 | * 1. the guest-virtual to guest-physical |
| 48 | * 2. while doing 1. it walks guest-physical to host-physical |
| 49 | * If the hardware supports that we don't need to do shadow paging. |
| 50 | */ |
Marcelo Tosatti | 2f333bc | 2008-02-22 12:21:37 -0500 | [diff] [blame] | 51 | bool tdp_enabled = false; |
Joerg Roedel | 1855267 | 2008-02-07 13:47:41 +0100 | [diff] [blame] | 52 | |
Xiao Guangrong | 8b1fe17 | 2010-08-30 18:22:53 +0800 | [diff] [blame] | 53 | enum { |
| 54 | AUDIT_PRE_PAGE_FAULT, |
| 55 | AUDIT_POST_PAGE_FAULT, |
| 56 | AUDIT_PRE_PTE_WRITE, |
Xiao Guangrong | 6903074 | 2010-09-27 18:09:29 +0800 | [diff] [blame] | 57 | AUDIT_POST_PTE_WRITE, |
| 58 | AUDIT_PRE_SYNC, |
| 59 | AUDIT_POST_SYNC |
Xiao Guangrong | 8b1fe17 | 2010-08-30 18:22:53 +0800 | [diff] [blame] | 60 | }; |
| 61 | |
Avi Kivity | 37a7d8b | 2007-01-05 16:36:56 -0800 | [diff] [blame] | 62 | #undef MMU_DEBUG |
| 63 | |
Avi Kivity | 37a7d8b | 2007-01-05 16:36:56 -0800 | [diff] [blame] | 64 | #ifdef MMU_DEBUG |
| 65 | |
| 66 | #define pgprintk(x...) do { if (dbg) printk(x); } while (0) |
| 67 | #define rmap_printk(x...) do { if (dbg) printk(x); } while (0) |
| 68 | |
| 69 | #else |
| 70 | |
| 71 | #define pgprintk(x...) do { } while (0) |
| 72 | #define rmap_printk(x...) do { } while (0) |
| 73 | |
| 74 | #endif |
| 75 | |
Xiao Guangrong | 8b1fe17 | 2010-08-30 18:22:53 +0800 | [diff] [blame] | 76 | #ifdef MMU_DEBUG |
Rusty Russell | 476bc00 | 2012-01-13 09:32:18 +1030 | [diff] [blame] | 77 | static bool dbg = 0; |
Avi Kivity | 6ada8cc | 2008-06-22 16:45:24 +0300 | [diff] [blame] | 78 | module_param(dbg, bool, 0644); |
Avi Kivity | 37a7d8b | 2007-01-05 16:36:56 -0800 | [diff] [blame] | 79 | #endif |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 80 | |
Yaozu Dong | d6c69ee | 2007-04-25 14:17:25 +0800 | [diff] [blame] | 81 | #ifndef MMU_DEBUG |
| 82 | #define ASSERT(x) do { } while (0) |
| 83 | #else |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 84 | #define ASSERT(x) \ |
| 85 | if (!(x)) { \ |
| 86 | printk(KERN_WARNING "assertion failed %s:%d: %s\n", \ |
| 87 | __FILE__, __LINE__, #x); \ |
| 88 | } |
Yaozu Dong | d6c69ee | 2007-04-25 14:17:25 +0800 | [diff] [blame] | 89 | #endif |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 90 | |
Xiao Guangrong | 957ed9e | 2010-08-22 19:12:48 +0800 | [diff] [blame] | 91 | #define PTE_PREFETCH_NUM 8 |
| 92 | |
Xudong Hao | 00763e4 | 2012-06-07 18:26:07 +0800 | [diff] [blame] | 93 | #define PT_FIRST_AVAIL_BITS_SHIFT 10 |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 94 | #define PT64_SECOND_AVAIL_BITS_SHIFT 52 |
| 95 | |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 96 | #define PT64_LEVEL_BITS 9 |
| 97 | |
| 98 | #define PT64_LEVEL_SHIFT(level) \ |
Mike Day | d77c26f | 2007-10-08 09:02:08 -0400 | [diff] [blame] | 99 | (PAGE_SHIFT + (level - 1) * PT64_LEVEL_BITS) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 100 | |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 101 | #define PT64_INDEX(address, level)\ |
| 102 | (((address) >> PT64_LEVEL_SHIFT(level)) & ((1 << PT64_LEVEL_BITS) - 1)) |
| 103 | |
| 104 | |
| 105 | #define PT32_LEVEL_BITS 10 |
| 106 | |
| 107 | #define PT32_LEVEL_SHIFT(level) \ |
Mike Day | d77c26f | 2007-10-08 09:02:08 -0400 | [diff] [blame] | 108 | (PAGE_SHIFT + (level - 1) * PT32_LEVEL_BITS) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 109 | |
Joerg Roedel | e04da98 | 2009-07-27 16:30:45 +0200 | [diff] [blame] | 110 | #define PT32_LVL_OFFSET_MASK(level) \ |
| 111 | (PT32_BASE_ADDR_MASK & ((1ULL << (PAGE_SHIFT + (((level) - 1) \ |
| 112 | * PT32_LEVEL_BITS))) - 1)) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 113 | |
| 114 | #define PT32_INDEX(address, level)\ |
| 115 | (((address) >> PT32_LEVEL_SHIFT(level)) & ((1 << PT32_LEVEL_BITS) - 1)) |
| 116 | |
| 117 | |
Avi Kivity | 27aba76 | 2007-03-09 13:04:31 +0200 | [diff] [blame] | 118 | #define PT64_BASE_ADDR_MASK (((1ULL << 52) - 1) & ~(u64)(PAGE_SIZE-1)) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 119 | #define PT64_DIR_BASE_ADDR_MASK \ |
| 120 | (PT64_BASE_ADDR_MASK & ~((1ULL << (PAGE_SHIFT + PT64_LEVEL_BITS)) - 1)) |
Joerg Roedel | e04da98 | 2009-07-27 16:30:45 +0200 | [diff] [blame] | 121 | #define PT64_LVL_ADDR_MASK(level) \ |
| 122 | (PT64_BASE_ADDR_MASK & ~((1ULL << (PAGE_SHIFT + (((level) - 1) \ |
| 123 | * PT64_LEVEL_BITS))) - 1)) |
| 124 | #define PT64_LVL_OFFSET_MASK(level) \ |
| 125 | (PT64_BASE_ADDR_MASK & ((1ULL << (PAGE_SHIFT + (((level) - 1) \ |
| 126 | * PT64_LEVEL_BITS))) - 1)) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 127 | |
| 128 | #define PT32_BASE_ADDR_MASK PAGE_MASK |
| 129 | #define PT32_DIR_BASE_ADDR_MASK \ |
| 130 | (PAGE_MASK & ~((1ULL << (PAGE_SHIFT + PT32_LEVEL_BITS)) - 1)) |
Joerg Roedel | e04da98 | 2009-07-27 16:30:45 +0200 | [diff] [blame] | 131 | #define PT32_LVL_ADDR_MASK(level) \ |
| 132 | (PAGE_MASK & ~((1ULL << (PAGE_SHIFT + (((level) - 1) \ |
| 133 | * PT32_LEVEL_BITS))) - 1)) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 134 | |
Avi Kivity | 79539ce | 2007-11-21 02:06:21 +0200 | [diff] [blame] | 135 | #define PT64_PERM_MASK (PT_PRESENT_MASK | PT_WRITABLE_MASK | PT_USER_MASK \ |
| 136 | | PT64_NX_MASK) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 137 | |
Avi Kivity | fe135d2 | 2007-12-09 16:15:46 +0200 | [diff] [blame] | 138 | #define ACC_EXEC_MASK 1 |
| 139 | #define ACC_WRITE_MASK PT_WRITABLE_MASK |
| 140 | #define ACC_USER_MASK PT_USER_MASK |
| 141 | #define ACC_ALL (ACC_EXEC_MASK | ACC_WRITE_MASK | ACC_USER_MASK) |
| 142 | |
Avi Kivity | 90bb6fc | 2009-12-31 12:10:16 +0200 | [diff] [blame] | 143 | #include <trace/events/kvm.h> |
| 144 | |
Avi Kivity | 0742017 | 2009-07-06 12:21:32 +0300 | [diff] [blame] | 145 | #define CREATE_TRACE_POINTS |
| 146 | #include "mmutrace.h" |
| 147 | |
Xiao Guangrong | 49fde34 | 2012-06-20 15:58:58 +0800 | [diff] [blame] | 148 | #define SPTE_HOST_WRITEABLE (1ULL << PT_FIRST_AVAIL_BITS_SHIFT) |
| 149 | #define SPTE_MMU_WRITEABLE (1ULL << (PT_FIRST_AVAIL_BITS_SHIFT + 1)) |
Izik Eidus | 1403283 | 2009-09-23 21:47:17 +0300 | [diff] [blame] | 150 | |
Avi Kivity | 135f8c2 | 2008-08-21 17:49:56 +0300 | [diff] [blame] | 151 | #define SHADOW_PT_INDEX(addr, level) PT64_INDEX(addr, level) |
| 152 | |
Takuya Yoshikawa | 220f773 | 2012-03-21 23:49:39 +0900 | [diff] [blame] | 153 | /* make pte_list_desc fit well in cache line */ |
| 154 | #define PTE_LIST_EXT 3 |
| 155 | |
Xiao Guangrong | 53c07b1 | 2011-05-15 23:26:20 +0800 | [diff] [blame] | 156 | struct pte_list_desc { |
| 157 | u64 *sptes[PTE_LIST_EXT]; |
| 158 | struct pte_list_desc *more; |
Avi Kivity | cd4a4e5 | 2007-01-05 16:36:38 -0800 | [diff] [blame] | 159 | }; |
| 160 | |
Avi Kivity | 2d11123 | 2008-12-25 14:39:47 +0200 | [diff] [blame] | 161 | struct kvm_shadow_walk_iterator { |
| 162 | u64 addr; |
| 163 | hpa_t shadow_addr; |
Avi Kivity | 2d11123 | 2008-12-25 14:39:47 +0200 | [diff] [blame] | 164 | u64 *sptep; |
Xiao Guangrong | dd3bfd5 | 2011-07-12 03:32:54 +0800 | [diff] [blame] | 165 | int level; |
Avi Kivity | 2d11123 | 2008-12-25 14:39:47 +0200 | [diff] [blame] | 166 | unsigned index; |
| 167 | }; |
| 168 | |
| 169 | #define for_each_shadow_entry(_vcpu, _addr, _walker) \ |
| 170 | for (shadow_walk_init(&(_walker), _vcpu, _addr); \ |
| 171 | shadow_walk_okay(&(_walker)); \ |
| 172 | shadow_walk_next(&(_walker))) |
| 173 | |
Xiao Guangrong | c2a2ac2 | 2011-07-12 03:32:13 +0800 | [diff] [blame] | 174 | #define for_each_shadow_entry_lockless(_vcpu, _addr, _walker, spte) \ |
| 175 | for (shadow_walk_init(&(_walker), _vcpu, _addr); \ |
| 176 | shadow_walk_okay(&(_walker)) && \ |
| 177 | ({ spte = mmu_spte_get_lockless(_walker.sptep); 1; }); \ |
| 178 | __shadow_walk_next(&(_walker), spte)) |
| 179 | |
Xiao Guangrong | 53c07b1 | 2011-05-15 23:26:20 +0800 | [diff] [blame] | 180 | static struct kmem_cache *pte_list_desc_cache; |
Avi Kivity | d3d25b0 | 2007-05-30 12:34:53 +0300 | [diff] [blame] | 181 | static struct kmem_cache *mmu_page_header_cache; |
Dave Hansen | 45221ab | 2010-08-19 18:11:37 -0700 | [diff] [blame] | 182 | static struct percpu_counter kvm_total_used_mmu_pages; |
Avi Kivity | b5a33a7 | 2007-04-15 16:31:09 +0300 | [diff] [blame] | 183 | |
Sheng Yang | 7b52345 | 2008-04-25 21:13:50 +0800 | [diff] [blame] | 184 | static u64 __read_mostly shadow_nx_mask; |
| 185 | static u64 __read_mostly shadow_x_mask; /* mutual exclusive with nx_mask */ |
| 186 | static u64 __read_mostly shadow_user_mask; |
| 187 | static u64 __read_mostly shadow_accessed_mask; |
| 188 | static u64 __read_mostly shadow_dirty_mask; |
Xiao Guangrong | ce88dec | 2011-07-12 03:33:44 +0800 | [diff] [blame] | 189 | static u64 __read_mostly shadow_mmio_mask; |
| 190 | |
| 191 | static void mmu_spte_set(u64 *sptep, u64 spte); |
Avi Kivity | e676505 | 2012-07-08 17:16:30 +0300 | [diff] [blame] | 192 | static void mmu_free_roots(struct kvm_vcpu *vcpu); |
Xiao Guangrong | ce88dec | 2011-07-12 03:33:44 +0800 | [diff] [blame] | 193 | |
| 194 | void kvm_mmu_set_mmio_spte_mask(u64 mmio_mask) |
| 195 | { |
| 196 | shadow_mmio_mask = mmio_mask; |
| 197 | } |
| 198 | EXPORT_SYMBOL_GPL(kvm_mmu_set_mmio_spte_mask); |
| 199 | |
| 200 | static void mark_mmio_spte(u64 *sptep, u64 gfn, unsigned access) |
| 201 | { |
| 202 | access &= ACC_WRITE_MASK | ACC_USER_MASK; |
| 203 | |
Xiao Guangrong | 4f02264 | 2011-07-12 03:34:24 +0800 | [diff] [blame] | 204 | trace_mark_mmio_spte(sptep, gfn, access); |
Xiao Guangrong | ce88dec | 2011-07-12 03:33:44 +0800 | [diff] [blame] | 205 | mmu_spte_set(sptep, shadow_mmio_mask | access | gfn << PAGE_SHIFT); |
| 206 | } |
| 207 | |
| 208 | static bool is_mmio_spte(u64 spte) |
| 209 | { |
| 210 | return (spte & shadow_mmio_mask) == shadow_mmio_mask; |
| 211 | } |
| 212 | |
| 213 | static gfn_t get_mmio_spte_gfn(u64 spte) |
| 214 | { |
| 215 | return (spte & ~shadow_mmio_mask) >> PAGE_SHIFT; |
| 216 | } |
| 217 | |
| 218 | static unsigned get_mmio_spte_access(u64 spte) |
| 219 | { |
| 220 | return (spte & ~shadow_mmio_mask) & ~PAGE_MASK; |
| 221 | } |
| 222 | |
| 223 | static bool set_mmio_spte(u64 *sptep, gfn_t gfn, pfn_t pfn, unsigned access) |
| 224 | { |
| 225 | if (unlikely(is_noslot_pfn(pfn))) { |
| 226 | mark_mmio_spte(sptep, gfn, access); |
| 227 | return true; |
| 228 | } |
| 229 | |
| 230 | return false; |
| 231 | } |
Avi Kivity | c7addb9 | 2007-09-16 18:58:32 +0200 | [diff] [blame] | 232 | |
Dong, Eddie | 82725b2 | 2009-03-30 16:21:08 +0800 | [diff] [blame] | 233 | static inline u64 rsvd_bits(int s, int e) |
| 234 | { |
| 235 | return ((1ULL << (e - s + 1)) - 1) << s; |
| 236 | } |
| 237 | |
Sheng Yang | 7b52345 | 2008-04-25 21:13:50 +0800 | [diff] [blame] | 238 | void kvm_mmu_set_mask_ptes(u64 user_mask, u64 accessed_mask, |
Sheng Yang | 4b12f0d | 2009-04-27 20:35:42 +0800 | [diff] [blame] | 239 | u64 dirty_mask, u64 nx_mask, u64 x_mask) |
Sheng Yang | 7b52345 | 2008-04-25 21:13:50 +0800 | [diff] [blame] | 240 | { |
| 241 | shadow_user_mask = user_mask; |
| 242 | shadow_accessed_mask = accessed_mask; |
| 243 | shadow_dirty_mask = dirty_mask; |
| 244 | shadow_nx_mask = nx_mask; |
| 245 | shadow_x_mask = x_mask; |
| 246 | } |
| 247 | EXPORT_SYMBOL_GPL(kvm_mmu_set_mask_ptes); |
| 248 | |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 249 | static int is_cpuid_PSE36(void) |
| 250 | { |
| 251 | return 1; |
| 252 | } |
| 253 | |
Avi Kivity | 73b1087 | 2007-01-26 00:56:41 -0800 | [diff] [blame] | 254 | static int is_nx(struct kvm_vcpu *vcpu) |
| 255 | { |
Avi Kivity | f6801df | 2010-01-21 15:31:50 +0200 | [diff] [blame] | 256 | return vcpu->arch.efer & EFER_NX; |
Avi Kivity | 73b1087 | 2007-01-26 00:56:41 -0800 | [diff] [blame] | 257 | } |
| 258 | |
Avi Kivity | c7addb9 | 2007-09-16 18:58:32 +0200 | [diff] [blame] | 259 | static int is_shadow_present_pte(u64 pte) |
| 260 | { |
Xiao Guangrong | ce88dec | 2011-07-12 03:33:44 +0800 | [diff] [blame] | 261 | return pte & PT_PRESENT_MASK && !is_mmio_spte(pte); |
Avi Kivity | c7addb9 | 2007-09-16 18:58:32 +0200 | [diff] [blame] | 262 | } |
| 263 | |
Marcelo Tosatti | 05da455 | 2008-02-23 11:44:30 -0300 | [diff] [blame] | 264 | static int is_large_pte(u64 pte) |
| 265 | { |
| 266 | return pte & PT_PAGE_SIZE_MASK; |
| 267 | } |
| 268 | |
Avi Kivity | 43a3795 | 2009-06-10 14:12:05 +0300 | [diff] [blame] | 269 | static int is_dirty_gpte(unsigned long pte) |
Avi Kivity | e3c5e7ec | 2007-10-11 12:32:30 +0200 | [diff] [blame] | 270 | { |
Avi Kivity | 439e218 | 2009-06-10 12:56:54 +0300 | [diff] [blame] | 271 | return pte & PT_DIRTY_MASK; |
Avi Kivity | e3c5e7ec | 2007-10-11 12:32:30 +0200 | [diff] [blame] | 272 | } |
| 273 | |
Avi Kivity | 43a3795 | 2009-06-10 14:12:05 +0300 | [diff] [blame] | 274 | static int is_rmap_spte(u64 pte) |
Avi Kivity | cd4a4e5 | 2007-01-05 16:36:38 -0800 | [diff] [blame] | 275 | { |
Avi Kivity | 4b1a80f | 2008-03-23 12:18:19 +0200 | [diff] [blame] | 276 | return is_shadow_present_pte(pte); |
Avi Kivity | cd4a4e5 | 2007-01-05 16:36:38 -0800 | [diff] [blame] | 277 | } |
| 278 | |
Marcelo Tosatti | 776e663 | 2009-06-10 12:27:03 -0300 | [diff] [blame] | 279 | static int is_last_spte(u64 pte, int level) |
| 280 | { |
| 281 | if (level == PT_PAGE_TABLE_LEVEL) |
| 282 | return 1; |
Joerg Roedel | 852e3c1 | 2009-07-27 16:30:44 +0200 | [diff] [blame] | 283 | if (is_large_pte(pte)) |
Marcelo Tosatti | 776e663 | 2009-06-10 12:27:03 -0300 | [diff] [blame] | 284 | return 1; |
| 285 | return 0; |
| 286 | } |
| 287 | |
Anthony Liguori | 35149e2 | 2008-04-02 14:46:56 -0500 | [diff] [blame] | 288 | static pfn_t spte_to_pfn(u64 pte) |
Avi Kivity | 0b49ea8 | 2008-03-23 15:06:23 +0200 | [diff] [blame] | 289 | { |
Anthony Liguori | 35149e2 | 2008-04-02 14:46:56 -0500 | [diff] [blame] | 290 | return (pte & PT64_BASE_ADDR_MASK) >> PAGE_SHIFT; |
Avi Kivity | 0b49ea8 | 2008-03-23 15:06:23 +0200 | [diff] [blame] | 291 | } |
| 292 | |
Avi Kivity | da92852 | 2007-11-21 13:54:47 +0200 | [diff] [blame] | 293 | static gfn_t pse36_gfn_delta(u32 gpte) |
| 294 | { |
| 295 | int shift = 32 - PT32_DIR_PSE36_SHIFT - PAGE_SHIFT; |
| 296 | |
| 297 | return (gpte & PT32_DIR_PSE36_MASK) << shift; |
| 298 | } |
| 299 | |
Xiao Guangrong | 603e065 | 2011-07-12 03:31:28 +0800 | [diff] [blame] | 300 | #ifdef CONFIG_X86_64 |
Avi Kivity | d555c33 | 2009-06-10 14:24:23 +0300 | [diff] [blame] | 301 | static void __set_spte(u64 *sptep, u64 spte) |
Avi Kivity | e663ee6 | 2007-05-31 15:46:04 +0300 | [diff] [blame] | 302 | { |
Xiao Guangrong | 603e065 | 2011-07-12 03:31:28 +0800 | [diff] [blame] | 303 | *sptep = spte; |
Avi Kivity | e663ee6 | 2007-05-31 15:46:04 +0300 | [diff] [blame] | 304 | } |
| 305 | |
Xiao Guangrong | 603e065 | 2011-07-12 03:31:28 +0800 | [diff] [blame] | 306 | static void __update_clear_spte_fast(u64 *sptep, u64 spte) |
Avi Kivity | a9221dd | 2010-06-06 14:48:06 +0300 | [diff] [blame] | 307 | { |
Xiao Guangrong | 603e065 | 2011-07-12 03:31:28 +0800 | [diff] [blame] | 308 | *sptep = spte; |
Avi Kivity | a9221dd | 2010-06-06 14:48:06 +0300 | [diff] [blame] | 309 | } |
| 310 | |
Xiao Guangrong | 603e065 | 2011-07-12 03:31:28 +0800 | [diff] [blame] | 311 | static u64 __update_clear_spte_slow(u64 *sptep, u64 spte) |
| 312 | { |
| 313 | return xchg(sptep, spte); |
| 314 | } |
Xiao Guangrong | c2a2ac2 | 2011-07-12 03:32:13 +0800 | [diff] [blame] | 315 | |
| 316 | static u64 __get_spte_lockless(u64 *sptep) |
| 317 | { |
| 318 | return ACCESS_ONCE(*sptep); |
| 319 | } |
Xiao Guangrong | ce88dec | 2011-07-12 03:33:44 +0800 | [diff] [blame] | 320 | |
| 321 | static bool __check_direct_spte_mmio_pf(u64 spte) |
| 322 | { |
| 323 | /* It is valid if the spte is zapped. */ |
| 324 | return spte == 0ull; |
| 325 | } |
Xiao Guangrong | 603e065 | 2011-07-12 03:31:28 +0800 | [diff] [blame] | 326 | #else |
| 327 | union split_spte { |
| 328 | struct { |
| 329 | u32 spte_low; |
| 330 | u32 spte_high; |
| 331 | }; |
| 332 | u64 spte; |
| 333 | }; |
| 334 | |
Xiao Guangrong | c2a2ac2 | 2011-07-12 03:32:13 +0800 | [diff] [blame] | 335 | static void count_spte_clear(u64 *sptep, u64 spte) |
| 336 | { |
| 337 | struct kvm_mmu_page *sp = page_header(__pa(sptep)); |
| 338 | |
| 339 | if (is_shadow_present_pte(spte)) |
| 340 | return; |
| 341 | |
| 342 | /* Ensure the spte is completely set before we increase the count */ |
| 343 | smp_wmb(); |
| 344 | sp->clear_spte_count++; |
| 345 | } |
| 346 | |
Xiao Guangrong | 603e065 | 2011-07-12 03:31:28 +0800 | [diff] [blame] | 347 | static void __set_spte(u64 *sptep, u64 spte) |
| 348 | { |
| 349 | union split_spte *ssptep, sspte; |
| 350 | |
| 351 | ssptep = (union split_spte *)sptep; |
| 352 | sspte = (union split_spte)spte; |
| 353 | |
| 354 | ssptep->spte_high = sspte.spte_high; |
| 355 | |
| 356 | /* |
| 357 | * If we map the spte from nonpresent to present, We should store |
| 358 | * the high bits firstly, then set present bit, so cpu can not |
| 359 | * fetch this spte while we are setting the spte. |
| 360 | */ |
| 361 | smp_wmb(); |
| 362 | |
| 363 | ssptep->spte_low = sspte.spte_low; |
| 364 | } |
| 365 | |
| 366 | static void __update_clear_spte_fast(u64 *sptep, u64 spte) |
| 367 | { |
| 368 | union split_spte *ssptep, sspte; |
| 369 | |
| 370 | ssptep = (union split_spte *)sptep; |
| 371 | sspte = (union split_spte)spte; |
| 372 | |
| 373 | ssptep->spte_low = sspte.spte_low; |
| 374 | |
| 375 | /* |
| 376 | * If we map the spte from present to nonpresent, we should clear |
| 377 | * present bit firstly to avoid vcpu fetch the old high bits. |
| 378 | */ |
| 379 | smp_wmb(); |
| 380 | |
| 381 | ssptep->spte_high = sspte.spte_high; |
Xiao Guangrong | c2a2ac2 | 2011-07-12 03:32:13 +0800 | [diff] [blame] | 382 | count_spte_clear(sptep, spte); |
Xiao Guangrong | 603e065 | 2011-07-12 03:31:28 +0800 | [diff] [blame] | 383 | } |
| 384 | |
| 385 | static u64 __update_clear_spte_slow(u64 *sptep, u64 spte) |
| 386 | { |
| 387 | union split_spte *ssptep, sspte, orig; |
| 388 | |
| 389 | ssptep = (union split_spte *)sptep; |
| 390 | sspte = (union split_spte)spte; |
| 391 | |
| 392 | /* xchg acts as a barrier before the setting of the high bits */ |
| 393 | orig.spte_low = xchg(&ssptep->spte_low, sspte.spte_low); |
Zhao Jin | 41bc318 | 2011-09-19 12:19:51 +0800 | [diff] [blame] | 394 | orig.spte_high = ssptep->spte_high; |
| 395 | ssptep->spte_high = sspte.spte_high; |
Xiao Guangrong | c2a2ac2 | 2011-07-12 03:32:13 +0800 | [diff] [blame] | 396 | count_spte_clear(sptep, spte); |
Xiao Guangrong | 603e065 | 2011-07-12 03:31:28 +0800 | [diff] [blame] | 397 | |
| 398 | return orig.spte; |
| 399 | } |
Xiao Guangrong | c2a2ac2 | 2011-07-12 03:32:13 +0800 | [diff] [blame] | 400 | |
| 401 | /* |
| 402 | * The idea using the light way get the spte on x86_32 guest is from |
| 403 | * gup_get_pte(arch/x86/mm/gup.c). |
| 404 | * The difference is we can not catch the spte tlb flush if we leave |
| 405 | * guest mode, so we emulate it by increase clear_spte_count when spte |
| 406 | * is cleared. |
| 407 | */ |
| 408 | static u64 __get_spte_lockless(u64 *sptep) |
| 409 | { |
| 410 | struct kvm_mmu_page *sp = page_header(__pa(sptep)); |
| 411 | union split_spte spte, *orig = (union split_spte *)sptep; |
| 412 | int count; |
| 413 | |
| 414 | retry: |
| 415 | count = sp->clear_spte_count; |
| 416 | smp_rmb(); |
| 417 | |
| 418 | spte.spte_low = orig->spte_low; |
| 419 | smp_rmb(); |
| 420 | |
| 421 | spte.spte_high = orig->spte_high; |
| 422 | smp_rmb(); |
| 423 | |
| 424 | if (unlikely(spte.spte_low != orig->spte_low || |
| 425 | count != sp->clear_spte_count)) |
| 426 | goto retry; |
| 427 | |
| 428 | return spte.spte; |
| 429 | } |
Xiao Guangrong | ce88dec | 2011-07-12 03:33:44 +0800 | [diff] [blame] | 430 | |
| 431 | static bool __check_direct_spte_mmio_pf(u64 spte) |
| 432 | { |
| 433 | union split_spte sspte = (union split_spte)spte; |
| 434 | u32 high_mmio_mask = shadow_mmio_mask >> 32; |
| 435 | |
| 436 | /* It is valid if the spte is zapped. */ |
| 437 | if (spte == 0ull) |
| 438 | return true; |
| 439 | |
| 440 | /* It is valid if the spte is being zapped. */ |
| 441 | if (sspte.spte_low == 0ull && |
| 442 | (sspte.spte_high & high_mmio_mask) == high_mmio_mask) |
| 443 | return true; |
| 444 | |
| 445 | return false; |
| 446 | } |
Xiao Guangrong | 603e065 | 2011-07-12 03:31:28 +0800 | [diff] [blame] | 447 | #endif |
| 448 | |
Xiao Guangrong | c7ba5b4 | 2012-06-20 15:59:18 +0800 | [diff] [blame] | 449 | static bool spte_is_locklessly_modifiable(u64 spte) |
| 450 | { |
Gleb Natapov | feb3eb7 | 2013-01-30 16:45:00 +0200 | [diff] [blame] | 451 | return (spte & (SPTE_HOST_WRITEABLE | SPTE_MMU_WRITEABLE)) == |
| 452 | (SPTE_HOST_WRITEABLE | SPTE_MMU_WRITEABLE); |
Xiao Guangrong | c7ba5b4 | 2012-06-20 15:59:18 +0800 | [diff] [blame] | 453 | } |
| 454 | |
Xiao Guangrong | 8672b72 | 2010-08-02 16:14:04 +0800 | [diff] [blame] | 455 | static bool spte_has_volatile_bits(u64 spte) |
| 456 | { |
Xiao Guangrong | c7ba5b4 | 2012-06-20 15:59:18 +0800 | [diff] [blame] | 457 | /* |
| 458 | * Always atomicly update spte if it can be updated |
| 459 | * out of mmu-lock, it can ensure dirty bit is not lost, |
| 460 | * also, it can help us to get a stable is_writable_pte() |
| 461 | * to ensure tlb flush is not missed. |
| 462 | */ |
| 463 | if (spte_is_locklessly_modifiable(spte)) |
| 464 | return true; |
| 465 | |
Xiao Guangrong | 8672b72 | 2010-08-02 16:14:04 +0800 | [diff] [blame] | 466 | if (!shadow_accessed_mask) |
| 467 | return false; |
| 468 | |
| 469 | if (!is_shadow_present_pte(spte)) |
| 470 | return false; |
| 471 | |
Xiao Guangrong | 4132779 | 2010-08-02 16:15:08 +0800 | [diff] [blame] | 472 | if ((spte & shadow_accessed_mask) && |
| 473 | (!is_writable_pte(spte) || (spte & shadow_dirty_mask))) |
Xiao Guangrong | 8672b72 | 2010-08-02 16:14:04 +0800 | [diff] [blame] | 474 | return false; |
| 475 | |
| 476 | return true; |
| 477 | } |
| 478 | |
Xiao Guangrong | 4132779 | 2010-08-02 16:15:08 +0800 | [diff] [blame] | 479 | static bool spte_is_bit_cleared(u64 old_spte, u64 new_spte, u64 bit_mask) |
| 480 | { |
| 481 | return (old_spte & bit_mask) && !(new_spte & bit_mask); |
| 482 | } |
| 483 | |
Xiao Guangrong | 1df9f2d | 2011-07-12 03:30:35 +0800 | [diff] [blame] | 484 | /* Rules for using mmu_spte_set: |
| 485 | * Set the sptep from nonpresent to present. |
| 486 | * Note: the sptep being assigned *must* be either not present |
| 487 | * or in a state where the hardware will not attempt to update |
| 488 | * the spte. |
| 489 | */ |
| 490 | static void mmu_spte_set(u64 *sptep, u64 new_spte) |
| 491 | { |
| 492 | WARN_ON(is_shadow_present_pte(*sptep)); |
| 493 | __set_spte(sptep, new_spte); |
| 494 | } |
| 495 | |
| 496 | /* Rules for using mmu_spte_update: |
| 497 | * Update the state bits, it means the mapped pfn is not changged. |
Xiao Guangrong | 6e7d035 | 2012-06-20 15:58:33 +0800 | [diff] [blame] | 498 | * |
| 499 | * Whenever we overwrite a writable spte with a read-only one we |
| 500 | * should flush remote TLBs. Otherwise rmap_write_protect |
| 501 | * will find a read-only spte, even though the writable spte |
| 502 | * might be cached on a CPU's TLB, the return value indicates this |
| 503 | * case. |
Xiao Guangrong | 1df9f2d | 2011-07-12 03:30:35 +0800 | [diff] [blame] | 504 | */ |
Xiao Guangrong | 6e7d035 | 2012-06-20 15:58:33 +0800 | [diff] [blame] | 505 | static bool mmu_spte_update(u64 *sptep, u64 new_spte) |
Avi Kivity | b79b93f | 2010-06-06 15:46:44 +0300 | [diff] [blame] | 506 | { |
Xiao Guangrong | c7ba5b4 | 2012-06-20 15:59:18 +0800 | [diff] [blame] | 507 | u64 old_spte = *sptep; |
Xiao Guangrong | 6e7d035 | 2012-06-20 15:58:33 +0800 | [diff] [blame] | 508 | bool ret = false; |
Avi Kivity | b79b93f | 2010-06-06 15:46:44 +0300 | [diff] [blame] | 509 | |
Xiao Guangrong | 4132779 | 2010-08-02 16:15:08 +0800 | [diff] [blame] | 510 | WARN_ON(!is_rmap_spte(new_spte)); |
| 511 | |
Xiao Guangrong | 6e7d035 | 2012-06-20 15:58:33 +0800 | [diff] [blame] | 512 | if (!is_shadow_present_pte(old_spte)) { |
| 513 | mmu_spte_set(sptep, new_spte); |
| 514 | return ret; |
| 515 | } |
Xiao Guangrong | 1df9f2d | 2011-07-12 03:30:35 +0800 | [diff] [blame] | 516 | |
Xiao Guangrong | c7ba5b4 | 2012-06-20 15:59:18 +0800 | [diff] [blame] | 517 | if (!spte_has_volatile_bits(old_spte)) |
Xiao Guangrong | 603e065 | 2011-07-12 03:31:28 +0800 | [diff] [blame] | 518 | __update_clear_spte_fast(sptep, new_spte); |
Xiao Guangrong | 4132779 | 2010-08-02 16:15:08 +0800 | [diff] [blame] | 519 | else |
Xiao Guangrong | 603e065 | 2011-07-12 03:31:28 +0800 | [diff] [blame] | 520 | old_spte = __update_clear_spte_slow(sptep, new_spte); |
Xiao Guangrong | 4132779 | 2010-08-02 16:15:08 +0800 | [diff] [blame] | 521 | |
Xiao Guangrong | c7ba5b4 | 2012-06-20 15:59:18 +0800 | [diff] [blame] | 522 | /* |
| 523 | * For the spte updated out of mmu-lock is safe, since |
| 524 | * we always atomicly update it, see the comments in |
| 525 | * spte_has_volatile_bits(). |
| 526 | */ |
Xiao Guangrong | 6e7d035 | 2012-06-20 15:58:33 +0800 | [diff] [blame] | 527 | if (is_writable_pte(old_spte) && !is_writable_pte(new_spte)) |
| 528 | ret = true; |
| 529 | |
Xiao Guangrong | 4132779 | 2010-08-02 16:15:08 +0800 | [diff] [blame] | 530 | if (!shadow_accessed_mask) |
Xiao Guangrong | 6e7d035 | 2012-06-20 15:58:33 +0800 | [diff] [blame] | 531 | return ret; |
Xiao Guangrong | 4132779 | 2010-08-02 16:15:08 +0800 | [diff] [blame] | 532 | |
| 533 | if (spte_is_bit_cleared(old_spte, new_spte, shadow_accessed_mask)) |
| 534 | kvm_set_pfn_accessed(spte_to_pfn(old_spte)); |
| 535 | if (spte_is_bit_cleared(old_spte, new_spte, shadow_dirty_mask)) |
| 536 | kvm_set_pfn_dirty(spte_to_pfn(old_spte)); |
Xiao Guangrong | 6e7d035 | 2012-06-20 15:58:33 +0800 | [diff] [blame] | 537 | |
| 538 | return ret; |
Avi Kivity | b79b93f | 2010-06-06 15:46:44 +0300 | [diff] [blame] | 539 | } |
| 540 | |
Xiao Guangrong | 1df9f2d | 2011-07-12 03:30:35 +0800 | [diff] [blame] | 541 | /* |
| 542 | * Rules for using mmu_spte_clear_track_bits: |
| 543 | * It sets the sptep from present to nonpresent, and track the |
| 544 | * state bits, it is used to clear the last level sptep. |
| 545 | */ |
| 546 | static int mmu_spte_clear_track_bits(u64 *sptep) |
| 547 | { |
| 548 | pfn_t pfn; |
| 549 | u64 old_spte = *sptep; |
| 550 | |
| 551 | if (!spte_has_volatile_bits(old_spte)) |
Xiao Guangrong | 603e065 | 2011-07-12 03:31:28 +0800 | [diff] [blame] | 552 | __update_clear_spte_fast(sptep, 0ull); |
Xiao Guangrong | 1df9f2d | 2011-07-12 03:30:35 +0800 | [diff] [blame] | 553 | else |
Xiao Guangrong | 603e065 | 2011-07-12 03:31:28 +0800 | [diff] [blame] | 554 | old_spte = __update_clear_spte_slow(sptep, 0ull); |
Xiao Guangrong | 1df9f2d | 2011-07-12 03:30:35 +0800 | [diff] [blame] | 555 | |
| 556 | if (!is_rmap_spte(old_spte)) |
| 557 | return 0; |
| 558 | |
| 559 | pfn = spte_to_pfn(old_spte); |
Xiao Guangrong | 86fde74 | 2012-07-17 21:52:52 +0800 | [diff] [blame] | 560 | |
| 561 | /* |
| 562 | * KVM does not hold the refcount of the page used by |
| 563 | * kvm mmu, before reclaiming the page, we should |
| 564 | * unmap it from mmu first. |
| 565 | */ |
| 566 | WARN_ON(!kvm_is_mmio_pfn(pfn) && !page_count(pfn_to_page(pfn))); |
| 567 | |
Xiao Guangrong | 1df9f2d | 2011-07-12 03:30:35 +0800 | [diff] [blame] | 568 | if (!shadow_accessed_mask || old_spte & shadow_accessed_mask) |
| 569 | kvm_set_pfn_accessed(pfn); |
| 570 | if (!shadow_dirty_mask || (old_spte & shadow_dirty_mask)) |
| 571 | kvm_set_pfn_dirty(pfn); |
| 572 | return 1; |
| 573 | } |
| 574 | |
| 575 | /* |
| 576 | * Rules for using mmu_spte_clear_no_track: |
| 577 | * Directly clear spte without caring the state bits of sptep, |
| 578 | * it is used to set the upper level spte. |
| 579 | */ |
| 580 | static void mmu_spte_clear_no_track(u64 *sptep) |
| 581 | { |
Xiao Guangrong | 603e065 | 2011-07-12 03:31:28 +0800 | [diff] [blame] | 582 | __update_clear_spte_fast(sptep, 0ull); |
Xiao Guangrong | 1df9f2d | 2011-07-12 03:30:35 +0800 | [diff] [blame] | 583 | } |
| 584 | |
Xiao Guangrong | c2a2ac2 | 2011-07-12 03:32:13 +0800 | [diff] [blame] | 585 | static u64 mmu_spte_get_lockless(u64 *sptep) |
| 586 | { |
| 587 | return __get_spte_lockless(sptep); |
| 588 | } |
| 589 | |
| 590 | static void walk_shadow_page_lockless_begin(struct kvm_vcpu *vcpu) |
| 591 | { |
Avi Kivity | c142786 | 2012-05-14 15:44:06 +0300 | [diff] [blame] | 592 | /* |
| 593 | * Prevent page table teardown by making any free-er wait during |
| 594 | * kvm_flush_remote_tlbs() IPI to all active vcpus. |
| 595 | */ |
| 596 | local_irq_disable(); |
| 597 | vcpu->mode = READING_SHADOW_PAGE_TABLES; |
| 598 | /* |
| 599 | * Make sure a following spte read is not reordered ahead of the write |
| 600 | * to vcpu->mode. |
| 601 | */ |
| 602 | smp_mb(); |
Xiao Guangrong | c2a2ac2 | 2011-07-12 03:32:13 +0800 | [diff] [blame] | 603 | } |
| 604 | |
| 605 | static void walk_shadow_page_lockless_end(struct kvm_vcpu *vcpu) |
| 606 | { |
Avi Kivity | c142786 | 2012-05-14 15:44:06 +0300 | [diff] [blame] | 607 | /* |
| 608 | * Make sure the write to vcpu->mode is not reordered in front of |
| 609 | * reads to sptes. If it does, kvm_commit_zap_page() can see us |
| 610 | * OUTSIDE_GUEST_MODE and proceed to free the shadow page table. |
| 611 | */ |
| 612 | smp_mb(); |
| 613 | vcpu->mode = OUTSIDE_GUEST_MODE; |
| 614 | local_irq_enable(); |
Xiao Guangrong | c2a2ac2 | 2011-07-12 03:32:13 +0800 | [diff] [blame] | 615 | } |
| 616 | |
Avi Kivity | e2dec93 | 2007-01-05 16:36:54 -0800 | [diff] [blame] | 617 | static int mmu_topup_memory_cache(struct kvm_mmu_memory_cache *cache, |
Avi Kivity | 2e3e588 | 2007-09-10 11:28:17 +0300 | [diff] [blame] | 618 | struct kmem_cache *base_cache, int min) |
Avi Kivity | 714b93d | 2007-01-05 16:36:53 -0800 | [diff] [blame] | 619 | { |
| 620 | void *obj; |
| 621 | |
| 622 | if (cache->nobjs >= min) |
Avi Kivity | e2dec93 | 2007-01-05 16:36:54 -0800 | [diff] [blame] | 623 | return 0; |
Avi Kivity | 714b93d | 2007-01-05 16:36:53 -0800 | [diff] [blame] | 624 | while (cache->nobjs < ARRAY_SIZE(cache->objects)) { |
Avi Kivity | 2e3e588 | 2007-09-10 11:28:17 +0300 | [diff] [blame] | 625 | obj = kmem_cache_zalloc(base_cache, GFP_KERNEL); |
Avi Kivity | 714b93d | 2007-01-05 16:36:53 -0800 | [diff] [blame] | 626 | if (!obj) |
Avi Kivity | e2dec93 | 2007-01-05 16:36:54 -0800 | [diff] [blame] | 627 | return -ENOMEM; |
Avi Kivity | 714b93d | 2007-01-05 16:36:53 -0800 | [diff] [blame] | 628 | cache->objects[cache->nobjs++] = obj; |
| 629 | } |
Avi Kivity | e2dec93 | 2007-01-05 16:36:54 -0800 | [diff] [blame] | 630 | return 0; |
Avi Kivity | 714b93d | 2007-01-05 16:36:53 -0800 | [diff] [blame] | 631 | } |
| 632 | |
Xiao Guangrong | f759e2b | 2011-09-22 16:53:17 +0800 | [diff] [blame] | 633 | static int mmu_memory_cache_free_objects(struct kvm_mmu_memory_cache *cache) |
| 634 | { |
| 635 | return cache->nobjs; |
| 636 | } |
| 637 | |
Xiao Guangrong | e8ad9a7 | 2010-05-13 10:06:02 +0800 | [diff] [blame] | 638 | static void mmu_free_memory_cache(struct kvm_mmu_memory_cache *mc, |
| 639 | struct kmem_cache *cache) |
Avi Kivity | 714b93d | 2007-01-05 16:36:53 -0800 | [diff] [blame] | 640 | { |
| 641 | while (mc->nobjs) |
Xiao Guangrong | e8ad9a7 | 2010-05-13 10:06:02 +0800 | [diff] [blame] | 642 | kmem_cache_free(cache, mc->objects[--mc->nobjs]); |
Avi Kivity | 714b93d | 2007-01-05 16:36:53 -0800 | [diff] [blame] | 643 | } |
| 644 | |
Avi Kivity | c1158e6 | 2007-07-20 08:18:27 +0300 | [diff] [blame] | 645 | 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] | 646 | int min) |
Avi Kivity | c1158e6 | 2007-07-20 08:18:27 +0300 | [diff] [blame] | 647 | { |
Xiao Guangrong | 842f22e | 2011-03-04 19:01:10 +0800 | [diff] [blame] | 648 | void *page; |
Avi Kivity | c1158e6 | 2007-07-20 08:18:27 +0300 | [diff] [blame] | 649 | |
| 650 | if (cache->nobjs >= min) |
| 651 | return 0; |
| 652 | while (cache->nobjs < ARRAY_SIZE(cache->objects)) { |
Xiao Guangrong | 842f22e | 2011-03-04 19:01:10 +0800 | [diff] [blame] | 653 | page = (void *)__get_free_page(GFP_KERNEL); |
Avi Kivity | c1158e6 | 2007-07-20 08:18:27 +0300 | [diff] [blame] | 654 | if (!page) |
| 655 | return -ENOMEM; |
Xiao Guangrong | 842f22e | 2011-03-04 19:01:10 +0800 | [diff] [blame] | 656 | cache->objects[cache->nobjs++] = page; |
Avi Kivity | c1158e6 | 2007-07-20 08:18:27 +0300 | [diff] [blame] | 657 | } |
| 658 | return 0; |
| 659 | } |
| 660 | |
| 661 | static void mmu_free_memory_cache_page(struct kvm_mmu_memory_cache *mc) |
| 662 | { |
| 663 | while (mc->nobjs) |
Avi Kivity | c4d198d | 2007-07-21 09:06:46 +0300 | [diff] [blame] | 664 | free_page((unsigned long)mc->objects[--mc->nobjs]); |
Avi Kivity | c1158e6 | 2007-07-20 08:18:27 +0300 | [diff] [blame] | 665 | } |
| 666 | |
Avi Kivity | 8c43850 | 2007-04-16 11:53:17 +0300 | [diff] [blame] | 667 | static int mmu_topup_memory_caches(struct kvm_vcpu *vcpu) |
| 668 | { |
| 669 | int r; |
| 670 | |
Xiao Guangrong | 53c07b1 | 2011-05-15 23:26:20 +0800 | [diff] [blame] | 671 | r = mmu_topup_memory_cache(&vcpu->arch.mmu_pte_list_desc_cache, |
Xiao Guangrong | 67052b3 | 2011-05-15 23:27:08 +0800 | [diff] [blame] | 672 | pte_list_desc_cache, 8 + PTE_PREFETCH_NUM); |
Avi Kivity | 2e3e588 | 2007-09-10 11:28:17 +0300 | [diff] [blame] | 673 | if (r) |
| 674 | goto out; |
Zhang Xiantao | ad312c7 | 2007-12-13 23:50:52 +0800 | [diff] [blame] | 675 | r = mmu_topup_memory_cache_page(&vcpu->arch.mmu_page_cache, 8); |
Avi Kivity | 2e3e588 | 2007-09-10 11:28:17 +0300 | [diff] [blame] | 676 | if (r) |
| 677 | goto out; |
Zhang Xiantao | ad312c7 | 2007-12-13 23:50:52 +0800 | [diff] [blame] | 678 | r = mmu_topup_memory_cache(&vcpu->arch.mmu_page_header_cache, |
Avi Kivity | 2e3e588 | 2007-09-10 11:28:17 +0300 | [diff] [blame] | 679 | mmu_page_header_cache, 4); |
| 680 | out: |
Avi Kivity | 8c43850 | 2007-04-16 11:53:17 +0300 | [diff] [blame] | 681 | return r; |
| 682 | } |
| 683 | |
Avi Kivity | 714b93d | 2007-01-05 16:36:53 -0800 | [diff] [blame] | 684 | static void mmu_free_memory_caches(struct kvm_vcpu *vcpu) |
| 685 | { |
Xiao Guangrong | 53c07b1 | 2011-05-15 23:26:20 +0800 | [diff] [blame] | 686 | mmu_free_memory_cache(&vcpu->arch.mmu_pte_list_desc_cache, |
| 687 | pte_list_desc_cache); |
Zhang Xiantao | ad312c7 | 2007-12-13 23:50:52 +0800 | [diff] [blame] | 688 | mmu_free_memory_cache_page(&vcpu->arch.mmu_page_cache); |
Xiao Guangrong | e8ad9a7 | 2010-05-13 10:06:02 +0800 | [diff] [blame] | 689 | mmu_free_memory_cache(&vcpu->arch.mmu_page_header_cache, |
| 690 | mmu_page_header_cache); |
Avi Kivity | 714b93d | 2007-01-05 16:36:53 -0800 | [diff] [blame] | 691 | } |
| 692 | |
Takuya Yoshikawa | 80feb89 | 2012-05-29 23:54:26 +0900 | [diff] [blame] | 693 | static void *mmu_memory_cache_alloc(struct kvm_mmu_memory_cache *mc) |
Avi Kivity | 714b93d | 2007-01-05 16:36:53 -0800 | [diff] [blame] | 694 | { |
| 695 | void *p; |
| 696 | |
| 697 | BUG_ON(!mc->nobjs); |
| 698 | p = mc->objects[--mc->nobjs]; |
Avi Kivity | 714b93d | 2007-01-05 16:36:53 -0800 | [diff] [blame] | 699 | return p; |
| 700 | } |
| 701 | |
Xiao Guangrong | 53c07b1 | 2011-05-15 23:26:20 +0800 | [diff] [blame] | 702 | 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] | 703 | { |
Takuya Yoshikawa | 80feb89 | 2012-05-29 23:54:26 +0900 | [diff] [blame] | 704 | return mmu_memory_cache_alloc(&vcpu->arch.mmu_pte_list_desc_cache); |
Avi Kivity | 714b93d | 2007-01-05 16:36:53 -0800 | [diff] [blame] | 705 | } |
| 706 | |
Xiao Guangrong | 53c07b1 | 2011-05-15 23:26:20 +0800 | [diff] [blame] | 707 | 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] | 708 | { |
Xiao Guangrong | 53c07b1 | 2011-05-15 23:26:20 +0800 | [diff] [blame] | 709 | kmem_cache_free(pte_list_desc_cache, pte_list_desc); |
Avi Kivity | 714b93d | 2007-01-05 16:36:53 -0800 | [diff] [blame] | 710 | } |
| 711 | |
Lai Jiangshan | 2032a93 | 2010-05-26 16:49:59 +0800 | [diff] [blame] | 712 | static gfn_t kvm_mmu_page_get_gfn(struct kvm_mmu_page *sp, int index) |
| 713 | { |
| 714 | if (!sp->role.direct) |
| 715 | return sp->gfns[index]; |
| 716 | |
| 717 | return sp->gfn + (index << ((sp->role.level - 1) * PT64_LEVEL_BITS)); |
| 718 | } |
| 719 | |
| 720 | static void kvm_mmu_page_set_gfn(struct kvm_mmu_page *sp, int index, gfn_t gfn) |
| 721 | { |
| 722 | if (sp->role.direct) |
| 723 | BUG_ON(gfn != kvm_mmu_page_get_gfn(sp, index)); |
| 724 | else |
| 725 | sp->gfns[index] = gfn; |
| 726 | } |
| 727 | |
Avi Kivity | cd4a4e5 | 2007-01-05 16:36:38 -0800 | [diff] [blame] | 728 | /* |
Takuya Yoshikawa | d4dbf47 | 2010-12-07 12:59:07 +0900 | [diff] [blame] | 729 | * Return the pointer to the large page information for a given gfn, |
| 730 | * handling slots that are not large page aligned. |
Marcelo Tosatti | 05da455 | 2008-02-23 11:44:30 -0300 | [diff] [blame] | 731 | */ |
Takuya Yoshikawa | d4dbf47 | 2010-12-07 12:59:07 +0900 | [diff] [blame] | 732 | static struct kvm_lpage_info *lpage_info_slot(gfn_t gfn, |
| 733 | struct kvm_memory_slot *slot, |
| 734 | int level) |
Marcelo Tosatti | 05da455 | 2008-02-23 11:44:30 -0300 | [diff] [blame] | 735 | { |
| 736 | unsigned long idx; |
| 737 | |
Takuya Yoshikawa | fb03cb6 | 2012-02-08 12:59:10 +0900 | [diff] [blame] | 738 | idx = gfn_to_index(gfn, slot->base_gfn, level); |
Takuya Yoshikawa | db3fe4e | 2012-02-08 13:02:18 +0900 | [diff] [blame] | 739 | return &slot->arch.lpage_info[level - 2][idx]; |
Marcelo Tosatti | 05da455 | 2008-02-23 11:44:30 -0300 | [diff] [blame] | 740 | } |
| 741 | |
| 742 | static void account_shadowed(struct kvm *kvm, gfn_t gfn) |
| 743 | { |
Joerg Roedel | d25797b | 2009-07-27 16:30:43 +0200 | [diff] [blame] | 744 | struct kvm_memory_slot *slot; |
Takuya Yoshikawa | d4dbf47 | 2010-12-07 12:59:07 +0900 | [diff] [blame] | 745 | struct kvm_lpage_info *linfo; |
Joerg Roedel | d25797b | 2009-07-27 16:30:43 +0200 | [diff] [blame] | 746 | int i; |
Marcelo Tosatti | 05da455 | 2008-02-23 11:44:30 -0300 | [diff] [blame] | 747 | |
Avi Kivity | a1f4d395 | 2010-06-21 11:44:20 +0300 | [diff] [blame] | 748 | slot = gfn_to_memslot(kvm, gfn); |
Joerg Roedel | d25797b | 2009-07-27 16:30:43 +0200 | [diff] [blame] | 749 | for (i = PT_DIRECTORY_LEVEL; |
| 750 | i < PT_PAGE_TABLE_LEVEL + KVM_NR_PAGE_SIZES; ++i) { |
Takuya Yoshikawa | d4dbf47 | 2010-12-07 12:59:07 +0900 | [diff] [blame] | 751 | linfo = lpage_info_slot(gfn, slot, i); |
| 752 | linfo->write_count += 1; |
Joerg Roedel | d25797b | 2009-07-27 16:30:43 +0200 | [diff] [blame] | 753 | } |
Xiao Guangrong | 332b207 | 2011-05-15 23:20:27 +0800 | [diff] [blame] | 754 | kvm->arch.indirect_shadow_pages++; |
Marcelo Tosatti | 05da455 | 2008-02-23 11:44:30 -0300 | [diff] [blame] | 755 | } |
| 756 | |
| 757 | static void unaccount_shadowed(struct kvm *kvm, gfn_t gfn) |
| 758 | { |
Joerg Roedel | d25797b | 2009-07-27 16:30:43 +0200 | [diff] [blame] | 759 | struct kvm_memory_slot *slot; |
Takuya Yoshikawa | d4dbf47 | 2010-12-07 12:59:07 +0900 | [diff] [blame] | 760 | struct kvm_lpage_info *linfo; |
Joerg Roedel | d25797b | 2009-07-27 16:30:43 +0200 | [diff] [blame] | 761 | int i; |
Marcelo Tosatti | 05da455 | 2008-02-23 11:44:30 -0300 | [diff] [blame] | 762 | |
Avi Kivity | a1f4d395 | 2010-06-21 11:44:20 +0300 | [diff] [blame] | 763 | slot = gfn_to_memslot(kvm, gfn); |
Joerg Roedel | d25797b | 2009-07-27 16:30:43 +0200 | [diff] [blame] | 764 | for (i = PT_DIRECTORY_LEVEL; |
| 765 | i < PT_PAGE_TABLE_LEVEL + KVM_NR_PAGE_SIZES; ++i) { |
Takuya Yoshikawa | d4dbf47 | 2010-12-07 12:59:07 +0900 | [diff] [blame] | 766 | linfo = lpage_info_slot(gfn, slot, i); |
| 767 | linfo->write_count -= 1; |
| 768 | WARN_ON(linfo->write_count < 0); |
Joerg Roedel | d25797b | 2009-07-27 16:30:43 +0200 | [diff] [blame] | 769 | } |
Xiao Guangrong | 332b207 | 2011-05-15 23:20:27 +0800 | [diff] [blame] | 770 | kvm->arch.indirect_shadow_pages--; |
Marcelo Tosatti | 05da455 | 2008-02-23 11:44:30 -0300 | [diff] [blame] | 771 | } |
| 772 | |
Joerg Roedel | d25797b | 2009-07-27 16:30:43 +0200 | [diff] [blame] | 773 | static int has_wrprotected_page(struct kvm *kvm, |
| 774 | gfn_t gfn, |
| 775 | int level) |
Marcelo Tosatti | 05da455 | 2008-02-23 11:44:30 -0300 | [diff] [blame] | 776 | { |
Izik Eidus | 2843099 | 2008-10-03 17:40:32 +0300 | [diff] [blame] | 777 | struct kvm_memory_slot *slot; |
Takuya Yoshikawa | d4dbf47 | 2010-12-07 12:59:07 +0900 | [diff] [blame] | 778 | struct kvm_lpage_info *linfo; |
Marcelo Tosatti | 05da455 | 2008-02-23 11:44:30 -0300 | [diff] [blame] | 779 | |
Avi Kivity | a1f4d395 | 2010-06-21 11:44:20 +0300 | [diff] [blame] | 780 | slot = gfn_to_memslot(kvm, gfn); |
Marcelo Tosatti | 05da455 | 2008-02-23 11:44:30 -0300 | [diff] [blame] | 781 | if (slot) { |
Takuya Yoshikawa | d4dbf47 | 2010-12-07 12:59:07 +0900 | [diff] [blame] | 782 | linfo = lpage_info_slot(gfn, slot, level); |
| 783 | return linfo->write_count; |
Marcelo Tosatti | 05da455 | 2008-02-23 11:44:30 -0300 | [diff] [blame] | 784 | } |
| 785 | |
| 786 | return 1; |
| 787 | } |
| 788 | |
Joerg Roedel | d25797b | 2009-07-27 16:30:43 +0200 | [diff] [blame] | 789 | static int host_mapping_level(struct kvm *kvm, gfn_t gfn) |
Marcelo Tosatti | 05da455 | 2008-02-23 11:44:30 -0300 | [diff] [blame] | 790 | { |
Joerg Roedel | 8f0b1ab | 2010-01-28 12:37:56 +0100 | [diff] [blame] | 791 | unsigned long page_size; |
Joerg Roedel | d25797b | 2009-07-27 16:30:43 +0200 | [diff] [blame] | 792 | int i, ret = 0; |
Marcelo Tosatti | 05da455 | 2008-02-23 11:44:30 -0300 | [diff] [blame] | 793 | |
Joerg Roedel | 8f0b1ab | 2010-01-28 12:37:56 +0100 | [diff] [blame] | 794 | page_size = kvm_host_page_size(kvm, gfn); |
Marcelo Tosatti | 05da455 | 2008-02-23 11:44:30 -0300 | [diff] [blame] | 795 | |
Joerg Roedel | d25797b | 2009-07-27 16:30:43 +0200 | [diff] [blame] | 796 | for (i = PT_PAGE_TABLE_LEVEL; |
| 797 | i < (PT_PAGE_TABLE_LEVEL + KVM_NR_PAGE_SIZES); ++i) { |
| 798 | if (page_size >= KVM_HPAGE_SIZE(i)) |
| 799 | ret = i; |
| 800 | else |
| 801 | break; |
| 802 | } |
| 803 | |
Marcelo Tosatti | 4c2155c | 2008-09-16 20:54:47 -0300 | [diff] [blame] | 804 | return ret; |
Marcelo Tosatti | 05da455 | 2008-02-23 11:44:30 -0300 | [diff] [blame] | 805 | } |
| 806 | |
Xiao Guangrong | 5d163b1 | 2011-03-09 15:43:00 +0800 | [diff] [blame] | 807 | static struct kvm_memory_slot * |
| 808 | gfn_to_memslot_dirty_bitmap(struct kvm_vcpu *vcpu, gfn_t gfn, |
| 809 | bool no_dirty_log) |
Marcelo Tosatti | 05da455 | 2008-02-23 11:44:30 -0300 | [diff] [blame] | 810 | { |
| 811 | struct kvm_memory_slot *slot; |
Xiao Guangrong | 5d163b1 | 2011-03-09 15:43:00 +0800 | [diff] [blame] | 812 | |
| 813 | slot = gfn_to_memslot(vcpu->kvm, gfn); |
| 814 | if (!slot || slot->flags & KVM_MEMSLOT_INVALID || |
| 815 | (no_dirty_log && slot->dirty_bitmap)) |
| 816 | slot = NULL; |
| 817 | |
| 818 | return slot; |
| 819 | } |
| 820 | |
| 821 | static bool mapping_level_dirty_bitmap(struct kvm_vcpu *vcpu, gfn_t large_gfn) |
| 822 | { |
Steve | a0a8eab | 2011-06-17 10:25:39 +0800 | [diff] [blame] | 823 | return !gfn_to_memslot_dirty_bitmap(vcpu, large_gfn, true); |
Andrea Arcangeli | 936a5fe | 2011-01-13 15:46:48 -0800 | [diff] [blame] | 824 | } |
| 825 | |
| 826 | static int mapping_level(struct kvm_vcpu *vcpu, gfn_t large_gfn) |
| 827 | { |
| 828 | int host_level, level, max_level; |
Marcelo Tosatti | 05da455 | 2008-02-23 11:44:30 -0300 | [diff] [blame] | 829 | |
Joerg Roedel | d25797b | 2009-07-27 16:30:43 +0200 | [diff] [blame] | 830 | host_level = host_mapping_level(vcpu->kvm, large_gfn); |
| 831 | |
| 832 | if (host_level == PT_PAGE_TABLE_LEVEL) |
| 833 | return host_level; |
| 834 | |
Xiao Guangrong | 55dd98c | 2013-02-05 15:26:54 +0800 | [diff] [blame^] | 835 | max_level = min(kvm_x86_ops->get_lpage_level(), host_level); |
Sheng Yang | 878403b | 2010-01-05 19:02:29 +0800 | [diff] [blame] | 836 | |
| 837 | for (level = PT_DIRECTORY_LEVEL; level <= max_level; ++level) |
Joerg Roedel | d25797b | 2009-07-27 16:30:43 +0200 | [diff] [blame] | 838 | if (has_wrprotected_page(vcpu->kvm, large_gfn, level)) |
| 839 | break; |
Joerg Roedel | d25797b | 2009-07-27 16:30:43 +0200 | [diff] [blame] | 840 | |
| 841 | return level - 1; |
Marcelo Tosatti | 05da455 | 2008-02-23 11:44:30 -0300 | [diff] [blame] | 842 | } |
| 843 | |
| 844 | /* |
Xiao Guangrong | 53c07b1 | 2011-05-15 23:26:20 +0800 | [diff] [blame] | 845 | * Pte mapping structures: |
| 846 | * |
| 847 | * If pte_list bit zero is zero, then pte_list point to the spte. |
| 848 | * |
| 849 | * If pte_list bit zero is one, (then pte_list & ~1) points to a struct |
| 850 | * pte_list_desc containing more mappings. |
| 851 | * |
| 852 | * Returns the number of pte entries before the spte was added or zero if |
| 853 | * the spte was not added. |
| 854 | * |
| 855 | */ |
| 856 | static int pte_list_add(struct kvm_vcpu *vcpu, u64 *spte, |
| 857 | unsigned long *pte_list) |
| 858 | { |
| 859 | struct pte_list_desc *desc; |
| 860 | int i, count = 0; |
| 861 | |
| 862 | if (!*pte_list) { |
| 863 | rmap_printk("pte_list_add: %p %llx 0->1\n", spte, *spte); |
| 864 | *pte_list = (unsigned long)spte; |
| 865 | } else if (!(*pte_list & 1)) { |
| 866 | rmap_printk("pte_list_add: %p %llx 1->many\n", spte, *spte); |
| 867 | desc = mmu_alloc_pte_list_desc(vcpu); |
| 868 | desc->sptes[0] = (u64 *)*pte_list; |
| 869 | desc->sptes[1] = spte; |
| 870 | *pte_list = (unsigned long)desc | 1; |
| 871 | ++count; |
| 872 | } else { |
| 873 | rmap_printk("pte_list_add: %p %llx many->many\n", spte, *spte); |
| 874 | desc = (struct pte_list_desc *)(*pte_list & ~1ul); |
| 875 | while (desc->sptes[PTE_LIST_EXT-1] && desc->more) { |
| 876 | desc = desc->more; |
| 877 | count += PTE_LIST_EXT; |
| 878 | } |
| 879 | if (desc->sptes[PTE_LIST_EXT-1]) { |
| 880 | desc->more = mmu_alloc_pte_list_desc(vcpu); |
| 881 | desc = desc->more; |
| 882 | } |
| 883 | for (i = 0; desc->sptes[i]; ++i) |
| 884 | ++count; |
| 885 | desc->sptes[i] = spte; |
| 886 | } |
| 887 | return count; |
| 888 | } |
| 889 | |
Xiao Guangrong | 53c07b1 | 2011-05-15 23:26:20 +0800 | [diff] [blame] | 890 | static void |
| 891 | pte_list_desc_remove_entry(unsigned long *pte_list, struct pte_list_desc *desc, |
| 892 | int i, struct pte_list_desc *prev_desc) |
| 893 | { |
| 894 | int j; |
| 895 | |
| 896 | for (j = PTE_LIST_EXT - 1; !desc->sptes[j] && j > i; --j) |
| 897 | ; |
| 898 | desc->sptes[i] = desc->sptes[j]; |
| 899 | desc->sptes[j] = NULL; |
| 900 | if (j != 0) |
| 901 | return; |
| 902 | if (!prev_desc && !desc->more) |
| 903 | *pte_list = (unsigned long)desc->sptes[0]; |
| 904 | else |
| 905 | if (prev_desc) |
| 906 | prev_desc->more = desc->more; |
| 907 | else |
| 908 | *pte_list = (unsigned long)desc->more | 1; |
| 909 | mmu_free_pte_list_desc(desc); |
| 910 | } |
| 911 | |
| 912 | static void pte_list_remove(u64 *spte, unsigned long *pte_list) |
| 913 | { |
| 914 | struct pte_list_desc *desc; |
| 915 | struct pte_list_desc *prev_desc; |
| 916 | int i; |
| 917 | |
| 918 | if (!*pte_list) { |
| 919 | printk(KERN_ERR "pte_list_remove: %p 0->BUG\n", spte); |
| 920 | BUG(); |
| 921 | } else if (!(*pte_list & 1)) { |
| 922 | rmap_printk("pte_list_remove: %p 1->0\n", spte); |
| 923 | if ((u64 *)*pte_list != spte) { |
| 924 | printk(KERN_ERR "pte_list_remove: %p 1->BUG\n", spte); |
| 925 | BUG(); |
| 926 | } |
| 927 | *pte_list = 0; |
| 928 | } else { |
| 929 | rmap_printk("pte_list_remove: %p many->many\n", spte); |
| 930 | desc = (struct pte_list_desc *)(*pte_list & ~1ul); |
| 931 | prev_desc = NULL; |
| 932 | while (desc) { |
| 933 | for (i = 0; i < PTE_LIST_EXT && desc->sptes[i]; ++i) |
| 934 | if (desc->sptes[i] == spte) { |
| 935 | pte_list_desc_remove_entry(pte_list, |
| 936 | desc, i, |
| 937 | prev_desc); |
| 938 | return; |
| 939 | } |
| 940 | prev_desc = desc; |
| 941 | desc = desc->more; |
| 942 | } |
| 943 | pr_err("pte_list_remove: %p many->many\n", spte); |
| 944 | BUG(); |
| 945 | } |
| 946 | } |
| 947 | |
Xiao Guangrong | 67052b3 | 2011-05-15 23:27:08 +0800 | [diff] [blame] | 948 | typedef void (*pte_list_walk_fn) (u64 *spte); |
| 949 | static void pte_list_walk(unsigned long *pte_list, pte_list_walk_fn fn) |
| 950 | { |
| 951 | struct pte_list_desc *desc; |
| 952 | int i; |
| 953 | |
| 954 | if (!*pte_list) |
| 955 | return; |
| 956 | |
| 957 | if (!(*pte_list & 1)) |
| 958 | return fn((u64 *)*pte_list); |
| 959 | |
| 960 | desc = (struct pte_list_desc *)(*pte_list & ~1ul); |
| 961 | while (desc) { |
| 962 | for (i = 0; i < PTE_LIST_EXT && desc->sptes[i]; ++i) |
| 963 | fn(desc->sptes[i]); |
| 964 | desc = desc->more; |
| 965 | } |
| 966 | } |
| 967 | |
Takuya Yoshikawa | 9373e2c0 | 2012-01-17 19:51:20 +0900 | [diff] [blame] | 968 | static unsigned long *__gfn_to_rmap(gfn_t gfn, int level, |
Takuya Yoshikawa | 9b9b149 | 2011-11-14 18:22:28 +0900 | [diff] [blame] | 969 | struct kvm_memory_slot *slot) |
| 970 | { |
Takuya Yoshikawa | 77d1130 | 2012-07-02 17:57:17 +0900 | [diff] [blame] | 971 | unsigned long idx; |
Takuya Yoshikawa | 9b9b149 | 2011-11-14 18:22:28 +0900 | [diff] [blame] | 972 | |
Takuya Yoshikawa | 77d1130 | 2012-07-02 17:57:17 +0900 | [diff] [blame] | 973 | idx = gfn_to_index(gfn, slot->base_gfn, level); |
Takuya Yoshikawa | d89cc61 | 2012-08-01 18:03:28 +0900 | [diff] [blame] | 974 | return &slot->arch.rmap[level - PT_PAGE_TABLE_LEVEL][idx]; |
Takuya Yoshikawa | 9b9b149 | 2011-11-14 18:22:28 +0900 | [diff] [blame] | 975 | } |
| 976 | |
Xiao Guangrong | 53c07b1 | 2011-05-15 23:26:20 +0800 | [diff] [blame] | 977 | /* |
Izik Eidus | 290fc38 | 2007-09-27 14:11:22 +0200 | [diff] [blame] | 978 | * Take gfn and return the reverse mapping to it. |
Izik Eidus | 290fc38 | 2007-09-27 14:11:22 +0200 | [diff] [blame] | 979 | */ |
Joerg Roedel | 44ad994 | 2009-07-27 16:30:42 +0200 | [diff] [blame] | 980 | 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] | 981 | { |
| 982 | struct kvm_memory_slot *slot; |
| 983 | |
| 984 | slot = gfn_to_memslot(kvm, gfn); |
Takuya Yoshikawa | 9373e2c0 | 2012-01-17 19:51:20 +0900 | [diff] [blame] | 985 | return __gfn_to_rmap(gfn, level, slot); |
Izik Eidus | 290fc38 | 2007-09-27 14:11:22 +0200 | [diff] [blame] | 986 | } |
| 987 | |
Xiao Guangrong | f759e2b | 2011-09-22 16:53:17 +0800 | [diff] [blame] | 988 | static bool rmap_can_add(struct kvm_vcpu *vcpu) |
| 989 | { |
| 990 | struct kvm_mmu_memory_cache *cache; |
| 991 | |
| 992 | cache = &vcpu->arch.mmu_pte_list_desc_cache; |
| 993 | return mmu_memory_cache_free_objects(cache); |
| 994 | } |
| 995 | |
Joerg Roedel | 44ad994 | 2009-07-27 16:30:42 +0200 | [diff] [blame] | 996 | 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] | 997 | { |
Avi Kivity | 4db3531 | 2007-11-21 15:28:32 +0200 | [diff] [blame] | 998 | struct kvm_mmu_page *sp; |
Izik Eidus | 290fc38 | 2007-09-27 14:11:22 +0200 | [diff] [blame] | 999 | unsigned long *rmapp; |
Avi Kivity | cd4a4e5 | 2007-01-05 16:36:38 -0800 | [diff] [blame] | 1000 | |
Avi Kivity | 4db3531 | 2007-11-21 15:28:32 +0200 | [diff] [blame] | 1001 | sp = page_header(__pa(spte)); |
Lai Jiangshan | 2032a93 | 2010-05-26 16:49:59 +0800 | [diff] [blame] | 1002 | kvm_mmu_page_set_gfn(sp, spte - sp->spt, gfn); |
Joerg Roedel | 44ad994 | 2009-07-27 16:30:42 +0200 | [diff] [blame] | 1003 | rmapp = gfn_to_rmap(vcpu->kvm, gfn, sp->role.level); |
Xiao Guangrong | 53c07b1 | 2011-05-15 23:26:20 +0800 | [diff] [blame] | 1004 | return pte_list_add(vcpu, spte, rmapp); |
Avi Kivity | cd4a4e5 | 2007-01-05 16:36:38 -0800 | [diff] [blame] | 1005 | } |
| 1006 | |
Izik Eidus | 290fc38 | 2007-09-27 14:11:22 +0200 | [diff] [blame] | 1007 | static void rmap_remove(struct kvm *kvm, u64 *spte) |
Avi Kivity | cd4a4e5 | 2007-01-05 16:36:38 -0800 | [diff] [blame] | 1008 | { |
Avi Kivity | 4db3531 | 2007-11-21 15:28:32 +0200 | [diff] [blame] | 1009 | struct kvm_mmu_page *sp; |
Lai Jiangshan | 2032a93 | 2010-05-26 16:49:59 +0800 | [diff] [blame] | 1010 | gfn_t gfn; |
Izik Eidus | 290fc38 | 2007-09-27 14:11:22 +0200 | [diff] [blame] | 1011 | unsigned long *rmapp; |
Avi Kivity | cd4a4e5 | 2007-01-05 16:36:38 -0800 | [diff] [blame] | 1012 | |
Avi Kivity | 4db3531 | 2007-11-21 15:28:32 +0200 | [diff] [blame] | 1013 | sp = page_header(__pa(spte)); |
Lai Jiangshan | 2032a93 | 2010-05-26 16:49:59 +0800 | [diff] [blame] | 1014 | gfn = kvm_mmu_page_get_gfn(sp, spte - sp->spt); |
| 1015 | rmapp = gfn_to_rmap(kvm, gfn, sp->role.level); |
Xiao Guangrong | 53c07b1 | 2011-05-15 23:26:20 +0800 | [diff] [blame] | 1016 | pte_list_remove(spte, rmapp); |
Avi Kivity | cd4a4e5 | 2007-01-05 16:36:38 -0800 | [diff] [blame] | 1017 | } |
| 1018 | |
Takuya Yoshikawa | 1e3f42f | 2012-03-21 23:50:34 +0900 | [diff] [blame] | 1019 | /* |
| 1020 | * Used by the following functions to iterate through the sptes linked by a |
| 1021 | * rmap. All fields are private and not assumed to be used outside. |
| 1022 | */ |
| 1023 | struct rmap_iterator { |
| 1024 | /* private fields */ |
| 1025 | struct pte_list_desc *desc; /* holds the sptep if not NULL */ |
| 1026 | int pos; /* index of the sptep */ |
| 1027 | }; |
| 1028 | |
| 1029 | /* |
| 1030 | * Iteration must be started by this function. This should also be used after |
| 1031 | * removing/dropping sptes from the rmap link because in such cases the |
| 1032 | * information in the itererator may not be valid. |
| 1033 | * |
| 1034 | * Returns sptep if found, NULL otherwise. |
| 1035 | */ |
| 1036 | static u64 *rmap_get_first(unsigned long rmap, struct rmap_iterator *iter) |
| 1037 | { |
| 1038 | if (!rmap) |
| 1039 | return NULL; |
| 1040 | |
| 1041 | if (!(rmap & 1)) { |
| 1042 | iter->desc = NULL; |
| 1043 | return (u64 *)rmap; |
| 1044 | } |
| 1045 | |
| 1046 | iter->desc = (struct pte_list_desc *)(rmap & ~1ul); |
| 1047 | iter->pos = 0; |
| 1048 | return iter->desc->sptes[iter->pos]; |
| 1049 | } |
| 1050 | |
| 1051 | /* |
| 1052 | * Must be used with a valid iterator: e.g. after rmap_get_first(). |
| 1053 | * |
| 1054 | * Returns sptep if found, NULL otherwise. |
| 1055 | */ |
| 1056 | static u64 *rmap_get_next(struct rmap_iterator *iter) |
| 1057 | { |
| 1058 | if (iter->desc) { |
| 1059 | if (iter->pos < PTE_LIST_EXT - 1) { |
| 1060 | u64 *sptep; |
| 1061 | |
| 1062 | ++iter->pos; |
| 1063 | sptep = iter->desc->sptes[iter->pos]; |
| 1064 | if (sptep) |
| 1065 | return sptep; |
| 1066 | } |
| 1067 | |
| 1068 | iter->desc = iter->desc->more; |
| 1069 | |
| 1070 | if (iter->desc) { |
| 1071 | iter->pos = 0; |
| 1072 | /* desc->sptes[0] cannot be NULL */ |
| 1073 | return iter->desc->sptes[iter->pos]; |
| 1074 | } |
| 1075 | } |
| 1076 | |
| 1077 | return NULL; |
| 1078 | } |
| 1079 | |
Xiao Guangrong | c370795 | 2011-07-12 03:28:04 +0800 | [diff] [blame] | 1080 | static void drop_spte(struct kvm *kvm, u64 *sptep) |
Xiao Guangrong | e4b502e | 2010-07-16 11:28:09 +0800 | [diff] [blame] | 1081 | { |
Xiao Guangrong | 1df9f2d | 2011-07-12 03:30:35 +0800 | [diff] [blame] | 1082 | if (mmu_spte_clear_track_bits(sptep)) |
Marcelo Tosatti | eb45fda | 2010-10-25 11:58:22 -0200 | [diff] [blame] | 1083 | rmap_remove(kvm, sptep); |
Avi Kivity | be38d27 | 2010-06-06 14:31:27 +0300 | [diff] [blame] | 1084 | } |
| 1085 | |
Xiao Guangrong | 8e22f95 | 2012-06-20 15:57:39 +0800 | [diff] [blame] | 1086 | |
| 1087 | static bool __drop_large_spte(struct kvm *kvm, u64 *sptep) |
| 1088 | { |
| 1089 | if (is_large_pte(*sptep)) { |
| 1090 | WARN_ON(page_header(__pa(sptep))->role.level == |
| 1091 | PT_PAGE_TABLE_LEVEL); |
| 1092 | drop_spte(kvm, sptep); |
| 1093 | --kvm->stat.lpages; |
| 1094 | return true; |
| 1095 | } |
| 1096 | |
| 1097 | return false; |
| 1098 | } |
| 1099 | |
| 1100 | static void drop_large_spte(struct kvm_vcpu *vcpu, u64 *sptep) |
| 1101 | { |
| 1102 | if (__drop_large_spte(vcpu->kvm, sptep)) |
| 1103 | kvm_flush_remote_tlbs(vcpu->kvm); |
| 1104 | } |
| 1105 | |
| 1106 | /* |
Xiao Guangrong | 49fde34 | 2012-06-20 15:58:58 +0800 | [diff] [blame] | 1107 | * Write-protect on the specified @sptep, @pt_protect indicates whether |
Xiao Guangrong | caf6900 | 2013-02-05 15:11:09 +0800 | [diff] [blame] | 1108 | * spte write-protection is caused by protecting shadow page table. |
Xiao Guangrong | 49fde34 | 2012-06-20 15:58:58 +0800 | [diff] [blame] | 1109 | * |
| 1110 | * Note: write protection is difference between drity logging and spte |
| 1111 | * protection: |
| 1112 | * - for dirty logging, the spte can be set to writable at anytime if |
| 1113 | * its dirty bitmap is properly set. |
| 1114 | * - for spte protection, the spte can be writable only after unsync-ing |
| 1115 | * shadow page. |
Xiao Guangrong | 8e22f95 | 2012-06-20 15:57:39 +0800 | [diff] [blame] | 1116 | * |
Xiao Guangrong | caf6900 | 2013-02-05 15:11:09 +0800 | [diff] [blame] | 1117 | * Return true if tlb need be flushed. |
Xiao Guangrong | 8e22f95 | 2012-06-20 15:57:39 +0800 | [diff] [blame] | 1118 | */ |
Xiao Guangrong | caf6900 | 2013-02-05 15:11:09 +0800 | [diff] [blame] | 1119 | 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] | 1120 | { |
| 1121 | u64 spte = *sptep; |
| 1122 | |
Xiao Guangrong | 49fde34 | 2012-06-20 15:58:58 +0800 | [diff] [blame] | 1123 | if (!is_writable_pte(spte) && |
| 1124 | !(pt_protect && spte_is_locklessly_modifiable(spte))) |
Xiao Guangrong | d13bc5b | 2012-06-20 15:57:15 +0800 | [diff] [blame] | 1125 | return false; |
| 1126 | |
| 1127 | rmap_printk("rmap_write_protect: spte %p %llx\n", sptep, *sptep); |
| 1128 | |
Xiao Guangrong | 49fde34 | 2012-06-20 15:58:58 +0800 | [diff] [blame] | 1129 | if (pt_protect) |
| 1130 | spte &= ~SPTE_MMU_WRITEABLE; |
Xiao Guangrong | d13bc5b | 2012-06-20 15:57:15 +0800 | [diff] [blame] | 1131 | spte = spte & ~PT_WRITABLE_MASK; |
Xiao Guangrong | 49fde34 | 2012-06-20 15:58:58 +0800 | [diff] [blame] | 1132 | |
Xiao Guangrong | caf6900 | 2013-02-05 15:11:09 +0800 | [diff] [blame] | 1133 | return mmu_spte_update(sptep, spte); |
Xiao Guangrong | d13bc5b | 2012-06-20 15:57:15 +0800 | [diff] [blame] | 1134 | } |
| 1135 | |
Xiao Guangrong | 49fde34 | 2012-06-20 15:58:58 +0800 | [diff] [blame] | 1136 | static bool __rmap_write_protect(struct kvm *kvm, unsigned long *rmapp, |
Takuya Yoshikawa | 245c391 | 2013-01-08 19:44:09 +0900 | [diff] [blame] | 1137 | bool pt_protect) |
Takuya Yoshikawa | a0ed460 | 2012-03-01 19:31:22 +0900 | [diff] [blame] | 1138 | { |
Takuya Yoshikawa | 1e3f42f | 2012-03-21 23:50:34 +0900 | [diff] [blame] | 1139 | u64 *sptep; |
| 1140 | struct rmap_iterator iter; |
Xiao Guangrong | d13bc5b | 2012-06-20 15:57:15 +0800 | [diff] [blame] | 1141 | bool flush = false; |
Takuya Yoshikawa | a0ed460 | 2012-03-01 19:31:22 +0900 | [diff] [blame] | 1142 | |
Takuya Yoshikawa | 1e3f42f | 2012-03-21 23:50:34 +0900 | [diff] [blame] | 1143 | for (sptep = rmap_get_first(*rmapp, &iter); sptep;) { |
| 1144 | BUG_ON(!(*sptep & PT_PRESENT_MASK)); |
Takuya Yoshikawa | a0ed460 | 2012-03-01 19:31:22 +0900 | [diff] [blame] | 1145 | |
Xiao Guangrong | caf6900 | 2013-02-05 15:11:09 +0800 | [diff] [blame] | 1146 | flush |= spte_write_protect(kvm, sptep, pt_protect); |
Xiao Guangrong | d13bc5b | 2012-06-20 15:57:15 +0800 | [diff] [blame] | 1147 | sptep = rmap_get_next(&iter); |
Takuya Yoshikawa | a0ed460 | 2012-03-01 19:31:22 +0900 | [diff] [blame] | 1148 | } |
| 1149 | |
Xiao Guangrong | d13bc5b | 2012-06-20 15:57:15 +0800 | [diff] [blame] | 1150 | return flush; |
Takuya Yoshikawa | a0ed460 | 2012-03-01 19:31:22 +0900 | [diff] [blame] | 1151 | } |
| 1152 | |
Takuya Yoshikawa | 5dc99b23 | 2012-03-01 19:32:16 +0900 | [diff] [blame] | 1153 | /** |
| 1154 | * kvm_mmu_write_protect_pt_masked - write protect selected PT level pages |
| 1155 | * @kvm: kvm instance |
| 1156 | * @slot: slot to protect |
| 1157 | * @gfn_offset: start of the BITS_PER_LONG pages we care about |
| 1158 | * @mask: indicates which pages we should protect |
| 1159 | * |
| 1160 | * Used when we do not need to care about huge page mappings: e.g. during dirty |
| 1161 | * logging we do not have any such mappings. |
| 1162 | */ |
| 1163 | void kvm_mmu_write_protect_pt_masked(struct kvm *kvm, |
| 1164 | struct kvm_memory_slot *slot, |
| 1165 | gfn_t gfn_offset, unsigned long mask) |
Izik Eidus | 98348e9 | 2007-10-16 14:42:30 +0200 | [diff] [blame] | 1166 | { |
Izik Eidus | 290fc38 | 2007-09-27 14:11:22 +0200 | [diff] [blame] | 1167 | unsigned long *rmapp; |
Takuya Yoshikawa | 5dc99b23 | 2012-03-01 19:32:16 +0900 | [diff] [blame] | 1168 | |
| 1169 | while (mask) { |
Takuya Yoshikawa | 65fbe37 | 2012-08-01 18:02:01 +0900 | [diff] [blame] | 1170 | rmapp = __gfn_to_rmap(slot->base_gfn + gfn_offset + __ffs(mask), |
| 1171 | PT_PAGE_TABLE_LEVEL, slot); |
Takuya Yoshikawa | 245c391 | 2013-01-08 19:44:09 +0900 | [diff] [blame] | 1172 | __rmap_write_protect(kvm, rmapp, false); |
Takuya Yoshikawa | 5dc99b23 | 2012-03-01 19:32:16 +0900 | [diff] [blame] | 1173 | |
| 1174 | /* clear the first set bit */ |
| 1175 | mask &= mask - 1; |
| 1176 | } |
| 1177 | } |
| 1178 | |
Xiao Guangrong | 2f84569 | 2012-06-20 15:56:53 +0800 | [diff] [blame] | 1179 | static bool rmap_write_protect(struct kvm *kvm, u64 gfn) |
Takuya Yoshikawa | 5dc99b23 | 2012-03-01 19:32:16 +0900 | [diff] [blame] | 1180 | { |
| 1181 | struct kvm_memory_slot *slot; |
| 1182 | unsigned long *rmapp; |
| 1183 | int i; |
Xiao Guangrong | 2f84569 | 2012-06-20 15:56:53 +0800 | [diff] [blame] | 1184 | bool write_protected = false; |
Takuya Yoshikawa | 5dc99b23 | 2012-03-01 19:32:16 +0900 | [diff] [blame] | 1185 | |
| 1186 | slot = gfn_to_memslot(kvm, gfn); |
Avi Kivity | 374cbac | 2007-01-05 16:36:43 -0800 | [diff] [blame] | 1187 | |
Takuya Yoshikawa | a0ed460 | 2012-03-01 19:31:22 +0900 | [diff] [blame] | 1188 | for (i = PT_PAGE_TABLE_LEVEL; |
Joerg Roedel | 44ad994 | 2009-07-27 16:30:42 +0200 | [diff] [blame] | 1189 | i < PT_PAGE_TABLE_LEVEL + KVM_NR_PAGE_SIZES; ++i) { |
Takuya Yoshikawa | 9373e2c0 | 2012-01-17 19:51:20 +0900 | [diff] [blame] | 1190 | rmapp = __gfn_to_rmap(gfn, i, slot); |
Takuya Yoshikawa | 245c391 | 2013-01-08 19:44:09 +0900 | [diff] [blame] | 1191 | write_protected |= __rmap_write_protect(kvm, rmapp, true); |
Marcelo Tosatti | 05da455 | 2008-02-23 11:44:30 -0300 | [diff] [blame] | 1192 | } |
| 1193 | |
Marcelo Tosatti | b1a3682 | 2008-12-01 22:32:03 -0200 | [diff] [blame] | 1194 | return write_protected; |
Avi Kivity | 374cbac | 2007-01-05 16:36:43 -0800 | [diff] [blame] | 1195 | } |
| 1196 | |
Frederik Deweerdt | 8a8365c | 2009-10-09 11:42:56 +0000 | [diff] [blame] | 1197 | static int kvm_unmap_rmapp(struct kvm *kvm, unsigned long *rmapp, |
Takuya Yoshikawa | 048212d | 2012-07-02 17:57:59 +0900 | [diff] [blame] | 1198 | struct kvm_memory_slot *slot, unsigned long data) |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 1199 | { |
Takuya Yoshikawa | 1e3f42f | 2012-03-21 23:50:34 +0900 | [diff] [blame] | 1200 | u64 *sptep; |
| 1201 | struct rmap_iterator iter; |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 1202 | int need_tlb_flush = 0; |
| 1203 | |
Takuya Yoshikawa | 1e3f42f | 2012-03-21 23:50:34 +0900 | [diff] [blame] | 1204 | while ((sptep = rmap_get_first(*rmapp, &iter))) { |
| 1205 | BUG_ON(!(*sptep & PT_PRESENT_MASK)); |
| 1206 | rmap_printk("kvm_rmap_unmap_hva: spte %p %llx\n", sptep, *sptep); |
| 1207 | |
| 1208 | drop_spte(kvm, sptep); |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 1209 | need_tlb_flush = 1; |
| 1210 | } |
Takuya Yoshikawa | 1e3f42f | 2012-03-21 23:50:34 +0900 | [diff] [blame] | 1211 | |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 1212 | return need_tlb_flush; |
| 1213 | } |
| 1214 | |
Frederik Deweerdt | 8a8365c | 2009-10-09 11:42:56 +0000 | [diff] [blame] | 1215 | static int kvm_set_pte_rmapp(struct kvm *kvm, unsigned long *rmapp, |
Takuya Yoshikawa | 048212d | 2012-07-02 17:57:59 +0900 | [diff] [blame] | 1216 | struct kvm_memory_slot *slot, unsigned long data) |
Izik Eidus | 3da0dd4 | 2009-09-23 21:47:18 +0300 | [diff] [blame] | 1217 | { |
Takuya Yoshikawa | 1e3f42f | 2012-03-21 23:50:34 +0900 | [diff] [blame] | 1218 | u64 *sptep; |
| 1219 | struct rmap_iterator iter; |
Izik Eidus | 3da0dd4 | 2009-09-23 21:47:18 +0300 | [diff] [blame] | 1220 | int need_flush = 0; |
Takuya Yoshikawa | 1e3f42f | 2012-03-21 23:50:34 +0900 | [diff] [blame] | 1221 | u64 new_spte; |
Izik Eidus | 3da0dd4 | 2009-09-23 21:47:18 +0300 | [diff] [blame] | 1222 | pte_t *ptep = (pte_t *)data; |
| 1223 | pfn_t new_pfn; |
| 1224 | |
| 1225 | WARN_ON(pte_huge(*ptep)); |
| 1226 | new_pfn = pte_pfn(*ptep); |
Takuya Yoshikawa | 1e3f42f | 2012-03-21 23:50:34 +0900 | [diff] [blame] | 1227 | |
| 1228 | for (sptep = rmap_get_first(*rmapp, &iter); sptep;) { |
| 1229 | BUG_ON(!is_shadow_present_pte(*sptep)); |
| 1230 | rmap_printk("kvm_set_pte_rmapp: spte %p %llx\n", sptep, *sptep); |
| 1231 | |
Izik Eidus | 3da0dd4 | 2009-09-23 21:47:18 +0300 | [diff] [blame] | 1232 | need_flush = 1; |
Takuya Yoshikawa | 1e3f42f | 2012-03-21 23:50:34 +0900 | [diff] [blame] | 1233 | |
Izik Eidus | 3da0dd4 | 2009-09-23 21:47:18 +0300 | [diff] [blame] | 1234 | if (pte_write(*ptep)) { |
Takuya Yoshikawa | 1e3f42f | 2012-03-21 23:50:34 +0900 | [diff] [blame] | 1235 | drop_spte(kvm, sptep); |
| 1236 | sptep = rmap_get_first(*rmapp, &iter); |
Izik Eidus | 3da0dd4 | 2009-09-23 21:47:18 +0300 | [diff] [blame] | 1237 | } else { |
Takuya Yoshikawa | 1e3f42f | 2012-03-21 23:50:34 +0900 | [diff] [blame] | 1238 | new_spte = *sptep & ~PT64_BASE_ADDR_MASK; |
Izik Eidus | 3da0dd4 | 2009-09-23 21:47:18 +0300 | [diff] [blame] | 1239 | new_spte |= (u64)new_pfn << PAGE_SHIFT; |
| 1240 | |
| 1241 | new_spte &= ~PT_WRITABLE_MASK; |
| 1242 | new_spte &= ~SPTE_HOST_WRITEABLE; |
Avi Kivity | b79b93f | 2010-06-06 15:46:44 +0300 | [diff] [blame] | 1243 | new_spte &= ~shadow_accessed_mask; |
Takuya Yoshikawa | 1e3f42f | 2012-03-21 23:50:34 +0900 | [diff] [blame] | 1244 | |
| 1245 | mmu_spte_clear_track_bits(sptep); |
| 1246 | mmu_spte_set(sptep, new_spte); |
| 1247 | sptep = rmap_get_next(&iter); |
Izik Eidus | 3da0dd4 | 2009-09-23 21:47:18 +0300 | [diff] [blame] | 1248 | } |
| 1249 | } |
Takuya Yoshikawa | 1e3f42f | 2012-03-21 23:50:34 +0900 | [diff] [blame] | 1250 | |
Izik Eidus | 3da0dd4 | 2009-09-23 21:47:18 +0300 | [diff] [blame] | 1251 | if (need_flush) |
| 1252 | kvm_flush_remote_tlbs(kvm); |
| 1253 | |
| 1254 | return 0; |
| 1255 | } |
| 1256 | |
Takuya Yoshikawa | 84504ef | 2012-07-02 17:55:48 +0900 | [diff] [blame] | 1257 | static int kvm_handle_hva_range(struct kvm *kvm, |
| 1258 | unsigned long start, |
| 1259 | unsigned long end, |
| 1260 | unsigned long data, |
| 1261 | int (*handler)(struct kvm *kvm, |
| 1262 | unsigned long *rmapp, |
Takuya Yoshikawa | 048212d | 2012-07-02 17:57:59 +0900 | [diff] [blame] | 1263 | struct kvm_memory_slot *slot, |
Takuya Yoshikawa | 84504ef | 2012-07-02 17:55:48 +0900 | [diff] [blame] | 1264 | unsigned long data)) |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 1265 | { |
Xiao Guangrong | be6ba0f | 2011-11-24 17:39:18 +0800 | [diff] [blame] | 1266 | int j; |
Takuya Yoshikawa | f395302 | 2012-07-02 17:58:48 +0900 | [diff] [blame] | 1267 | int ret = 0; |
Marcelo Tosatti | bc6678a | 2009-12-23 14:35:21 -0200 | [diff] [blame] | 1268 | struct kvm_memslots *slots; |
Xiao Guangrong | be6ba0f | 2011-11-24 17:39:18 +0800 | [diff] [blame] | 1269 | struct kvm_memory_slot *memslot; |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 1270 | |
Lai Jiangshan | 90d83dc | 2010-04-19 17:41:23 +0800 | [diff] [blame] | 1271 | slots = kvm_memslots(kvm); |
Marcelo Tosatti | bc6678a | 2009-12-23 14:35:21 -0200 | [diff] [blame] | 1272 | |
Xiao Guangrong | be6ba0f | 2011-11-24 17:39:18 +0800 | [diff] [blame] | 1273 | kvm_for_each_memslot(memslot, slots) { |
Takuya Yoshikawa | 84504ef | 2012-07-02 17:55:48 +0900 | [diff] [blame] | 1274 | unsigned long hva_start, hva_end; |
Takuya Yoshikawa | bcd3ef5 | 2012-07-02 17:59:33 +0900 | [diff] [blame] | 1275 | gfn_t gfn_start, gfn_end; |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 1276 | |
Takuya Yoshikawa | 84504ef | 2012-07-02 17:55:48 +0900 | [diff] [blame] | 1277 | hva_start = max(start, memslot->userspace_addr); |
| 1278 | hva_end = min(end, memslot->userspace_addr + |
| 1279 | (memslot->npages << PAGE_SHIFT)); |
| 1280 | if (hva_start >= hva_end) |
| 1281 | continue; |
| 1282 | /* |
| 1283 | * {gfn(page) | page intersects with [hva_start, hva_end)} = |
Takuya Yoshikawa | bcd3ef5 | 2012-07-02 17:59:33 +0900 | [diff] [blame] | 1284 | * {gfn_start, gfn_start+1, ..., gfn_end-1}. |
Takuya Yoshikawa | 84504ef | 2012-07-02 17:55:48 +0900 | [diff] [blame] | 1285 | */ |
Takuya Yoshikawa | bcd3ef5 | 2012-07-02 17:59:33 +0900 | [diff] [blame] | 1286 | gfn_start = hva_to_gfn_memslot(hva_start, memslot); |
Takuya Yoshikawa | 84504ef | 2012-07-02 17:55:48 +0900 | [diff] [blame] | 1287 | gfn_end = hva_to_gfn_memslot(hva_end + PAGE_SIZE - 1, memslot); |
Joerg Roedel | 852e3c1 | 2009-07-27 16:30:44 +0200 | [diff] [blame] | 1288 | |
Takuya Yoshikawa | bcd3ef5 | 2012-07-02 17:59:33 +0900 | [diff] [blame] | 1289 | for (j = PT_PAGE_TABLE_LEVEL; |
| 1290 | j < PT_PAGE_TABLE_LEVEL + KVM_NR_PAGE_SIZES; ++j) { |
| 1291 | unsigned long idx, idx_end; |
| 1292 | unsigned long *rmapp; |
Joerg Roedel | 852e3c1 | 2009-07-27 16:30:44 +0200 | [diff] [blame] | 1293 | |
Takuya Yoshikawa | bcd3ef5 | 2012-07-02 17:59:33 +0900 | [diff] [blame] | 1294 | /* |
| 1295 | * {idx(page_j) | page_j intersects with |
| 1296 | * [hva_start, hva_end)} = {idx, idx+1, ..., idx_end}. |
| 1297 | */ |
| 1298 | idx = gfn_to_index(gfn_start, memslot->base_gfn, j); |
| 1299 | idx_end = gfn_to_index(gfn_end - 1, memslot->base_gfn, j); |
Andrea Arcangeli | 6e3e243 | 2010-07-16 11:52:55 +0200 | [diff] [blame] | 1300 | |
Takuya Yoshikawa | bcd3ef5 | 2012-07-02 17:59:33 +0900 | [diff] [blame] | 1301 | rmapp = __gfn_to_rmap(gfn_start, j, memslot); |
| 1302 | |
| 1303 | for (; idx <= idx_end; ++idx) |
| 1304 | ret |= handler(kvm, rmapp++, memslot, data); |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 1305 | } |
| 1306 | } |
| 1307 | |
Takuya Yoshikawa | f395302 | 2012-07-02 17:58:48 +0900 | [diff] [blame] | 1308 | return ret; |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 1309 | } |
| 1310 | |
Takuya Yoshikawa | 84504ef | 2012-07-02 17:55:48 +0900 | [diff] [blame] | 1311 | static int kvm_handle_hva(struct kvm *kvm, unsigned long hva, |
| 1312 | unsigned long data, |
| 1313 | int (*handler)(struct kvm *kvm, unsigned long *rmapp, |
Takuya Yoshikawa | 048212d | 2012-07-02 17:57:59 +0900 | [diff] [blame] | 1314 | struct kvm_memory_slot *slot, |
Takuya Yoshikawa | 84504ef | 2012-07-02 17:55:48 +0900 | [diff] [blame] | 1315 | unsigned long data)) |
| 1316 | { |
| 1317 | return kvm_handle_hva_range(kvm, hva, hva + 1, data, handler); |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 1318 | } |
| 1319 | |
| 1320 | int kvm_unmap_hva(struct kvm *kvm, unsigned long hva) |
| 1321 | { |
Izik Eidus | 3da0dd4 | 2009-09-23 21:47:18 +0300 | [diff] [blame] | 1322 | return kvm_handle_hva(kvm, hva, 0, kvm_unmap_rmapp); |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 1323 | } |
| 1324 | |
Takuya Yoshikawa | b3ae209 | 2012-07-02 17:56:33 +0900 | [diff] [blame] | 1325 | int kvm_unmap_hva_range(struct kvm *kvm, unsigned long start, unsigned long end) |
| 1326 | { |
| 1327 | return kvm_handle_hva_range(kvm, start, end, 0, kvm_unmap_rmapp); |
| 1328 | } |
| 1329 | |
Izik Eidus | 3da0dd4 | 2009-09-23 21:47:18 +0300 | [diff] [blame] | 1330 | void kvm_set_spte_hva(struct kvm *kvm, unsigned long hva, pte_t pte) |
| 1331 | { |
Frederik Deweerdt | 8a8365c | 2009-10-09 11:42:56 +0000 | [diff] [blame] | 1332 | kvm_handle_hva(kvm, hva, (unsigned long)&pte, kvm_set_pte_rmapp); |
Izik Eidus | 3da0dd4 | 2009-09-23 21:47:18 +0300 | [diff] [blame] | 1333 | } |
| 1334 | |
Frederik Deweerdt | 8a8365c | 2009-10-09 11:42:56 +0000 | [diff] [blame] | 1335 | static int kvm_age_rmapp(struct kvm *kvm, unsigned long *rmapp, |
Takuya Yoshikawa | 048212d | 2012-07-02 17:57:59 +0900 | [diff] [blame] | 1336 | struct kvm_memory_slot *slot, unsigned long data) |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 1337 | { |
Takuya Yoshikawa | 1e3f42f | 2012-03-21 23:50:34 +0900 | [diff] [blame] | 1338 | u64 *sptep; |
Michael S. Tsirkin | 79f702a | 2012-06-03 11:34:08 +0300 | [diff] [blame] | 1339 | struct rmap_iterator uninitialized_var(iter); |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 1340 | int young = 0; |
| 1341 | |
Rik van Riel | 6316e1c | 2010-02-03 16:11:03 -0500 | [diff] [blame] | 1342 | /* |
Xudong Hao | 3f6d8c8 | 2012-05-22 11:23:15 +0800 | [diff] [blame] | 1343 | * In case of absence of EPT Access and Dirty Bits supports, |
| 1344 | * 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] | 1345 | * an EPT mapping, and clearing it if it does. On the next access, |
| 1346 | * a new EPT mapping will be established. |
| 1347 | * This has some overhead, but not as much as the cost of swapping |
| 1348 | * out actively used pages or breaking up actively used hugepages. |
| 1349 | */ |
Takuya Yoshikawa | f395302 | 2012-07-02 17:58:48 +0900 | [diff] [blame] | 1350 | if (!shadow_accessed_mask) { |
| 1351 | young = kvm_unmap_rmapp(kvm, rmapp, slot, data); |
| 1352 | goto out; |
| 1353 | } |
Sheng Yang | 534e38b | 2008-09-08 15:12:30 +0800 | [diff] [blame] | 1354 | |
Takuya Yoshikawa | 1e3f42f | 2012-03-21 23:50:34 +0900 | [diff] [blame] | 1355 | for (sptep = rmap_get_first(*rmapp, &iter); sptep; |
| 1356 | sptep = rmap_get_next(&iter)) { |
Xudong Hao | 3f6d8c8 | 2012-05-22 11:23:15 +0800 | [diff] [blame] | 1357 | BUG_ON(!is_shadow_present_pte(*sptep)); |
Takuya Yoshikawa | 1e3f42f | 2012-03-21 23:50:34 +0900 | [diff] [blame] | 1358 | |
Xudong Hao | 3f6d8c8 | 2012-05-22 11:23:15 +0800 | [diff] [blame] | 1359 | if (*sptep & shadow_accessed_mask) { |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 1360 | young = 1; |
Xudong Hao | 3f6d8c8 | 2012-05-22 11:23:15 +0800 | [diff] [blame] | 1361 | clear_bit((ffs(shadow_accessed_mask) - 1), |
| 1362 | (unsigned long *)sptep); |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 1363 | } |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 1364 | } |
Takuya Yoshikawa | f395302 | 2012-07-02 17:58:48 +0900 | [diff] [blame] | 1365 | out: |
| 1366 | /* @data has hva passed to kvm_age_hva(). */ |
| 1367 | trace_kvm_age_page(data, slot, young); |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 1368 | return young; |
| 1369 | } |
| 1370 | |
Andrea Arcangeli | 8ee5382 | 2011-01-13 15:47:10 -0800 | [diff] [blame] | 1371 | static int kvm_test_age_rmapp(struct kvm *kvm, unsigned long *rmapp, |
Takuya Yoshikawa | 048212d | 2012-07-02 17:57:59 +0900 | [diff] [blame] | 1372 | struct kvm_memory_slot *slot, unsigned long data) |
Andrea Arcangeli | 8ee5382 | 2011-01-13 15:47:10 -0800 | [diff] [blame] | 1373 | { |
Takuya Yoshikawa | 1e3f42f | 2012-03-21 23:50:34 +0900 | [diff] [blame] | 1374 | u64 *sptep; |
| 1375 | struct rmap_iterator iter; |
Andrea Arcangeli | 8ee5382 | 2011-01-13 15:47:10 -0800 | [diff] [blame] | 1376 | int young = 0; |
| 1377 | |
| 1378 | /* |
| 1379 | * If there's no access bit in the secondary pte set by the |
| 1380 | * hardware it's up to gup-fast/gup to set the access bit in |
| 1381 | * the primary pte or in the page structure. |
| 1382 | */ |
| 1383 | if (!shadow_accessed_mask) |
| 1384 | goto out; |
| 1385 | |
Takuya Yoshikawa | 1e3f42f | 2012-03-21 23:50:34 +0900 | [diff] [blame] | 1386 | for (sptep = rmap_get_first(*rmapp, &iter); sptep; |
| 1387 | sptep = rmap_get_next(&iter)) { |
Xudong Hao | 3f6d8c8 | 2012-05-22 11:23:15 +0800 | [diff] [blame] | 1388 | BUG_ON(!is_shadow_present_pte(*sptep)); |
Takuya Yoshikawa | 1e3f42f | 2012-03-21 23:50:34 +0900 | [diff] [blame] | 1389 | |
Xudong Hao | 3f6d8c8 | 2012-05-22 11:23:15 +0800 | [diff] [blame] | 1390 | if (*sptep & shadow_accessed_mask) { |
Andrea Arcangeli | 8ee5382 | 2011-01-13 15:47:10 -0800 | [diff] [blame] | 1391 | young = 1; |
| 1392 | break; |
| 1393 | } |
Andrea Arcangeli | 8ee5382 | 2011-01-13 15:47:10 -0800 | [diff] [blame] | 1394 | } |
| 1395 | out: |
| 1396 | return young; |
| 1397 | } |
| 1398 | |
Marcelo Tosatti | 53a27b3 | 2009-08-05 15:43:58 -0300 | [diff] [blame] | 1399 | #define RMAP_RECYCLE_THRESHOLD 1000 |
| 1400 | |
Joerg Roedel | 852e3c1 | 2009-07-27 16:30:44 +0200 | [diff] [blame] | 1401 | 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] | 1402 | { |
| 1403 | unsigned long *rmapp; |
Joerg Roedel | 852e3c1 | 2009-07-27 16:30:44 +0200 | [diff] [blame] | 1404 | struct kvm_mmu_page *sp; |
| 1405 | |
| 1406 | sp = page_header(__pa(spte)); |
Marcelo Tosatti | 53a27b3 | 2009-08-05 15:43:58 -0300 | [diff] [blame] | 1407 | |
Joerg Roedel | 852e3c1 | 2009-07-27 16:30:44 +0200 | [diff] [blame] | 1408 | rmapp = gfn_to_rmap(vcpu->kvm, gfn, sp->role.level); |
Marcelo Tosatti | 53a27b3 | 2009-08-05 15:43:58 -0300 | [diff] [blame] | 1409 | |
Takuya Yoshikawa | 048212d | 2012-07-02 17:57:59 +0900 | [diff] [blame] | 1410 | kvm_unmap_rmapp(vcpu->kvm, rmapp, NULL, 0); |
Marcelo Tosatti | 53a27b3 | 2009-08-05 15:43:58 -0300 | [diff] [blame] | 1411 | kvm_flush_remote_tlbs(vcpu->kvm); |
| 1412 | } |
| 1413 | |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 1414 | int kvm_age_hva(struct kvm *kvm, unsigned long hva) |
| 1415 | { |
Takuya Yoshikawa | f395302 | 2012-07-02 17:58:48 +0900 | [diff] [blame] | 1416 | return kvm_handle_hva(kvm, hva, hva, kvm_age_rmapp); |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 1417 | } |
| 1418 | |
Andrea Arcangeli | 8ee5382 | 2011-01-13 15:47:10 -0800 | [diff] [blame] | 1419 | int kvm_test_age_hva(struct kvm *kvm, unsigned long hva) |
| 1420 | { |
| 1421 | return kvm_handle_hva(kvm, hva, 0, kvm_test_age_rmapp); |
| 1422 | } |
| 1423 | |
Yaozu Dong | d6c69ee | 2007-04-25 14:17:25 +0800 | [diff] [blame] | 1424 | #ifdef MMU_DEBUG |
Avi Kivity | 47ad8e6 | 2007-05-06 15:50:58 +0300 | [diff] [blame] | 1425 | static int is_empty_shadow_page(u64 *spt) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1426 | { |
Avi Kivity | 139bdb2 | 2007-01-05 16:36:50 -0800 | [diff] [blame] | 1427 | u64 *pos; |
| 1428 | u64 *end; |
| 1429 | |
Avi Kivity | 47ad8e6 | 2007-05-06 15:50:58 +0300 | [diff] [blame] | 1430 | for (pos = spt, end = pos + PAGE_SIZE / sizeof(u64); pos != end; pos++) |
Avi Kivity | 3c91551 | 2008-05-20 16:21:13 +0300 | [diff] [blame] | 1431 | if (is_shadow_present_pte(*pos)) { |
Harvey Harrison | b8688d5 | 2008-03-03 12:59:56 -0800 | [diff] [blame] | 1432 | printk(KERN_ERR "%s: %p %llx\n", __func__, |
Avi Kivity | 139bdb2 | 2007-01-05 16:36:50 -0800 | [diff] [blame] | 1433 | pos, *pos); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1434 | return 0; |
Avi Kivity | 139bdb2 | 2007-01-05 16:36:50 -0800 | [diff] [blame] | 1435 | } |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1436 | return 1; |
| 1437 | } |
Yaozu Dong | d6c69ee | 2007-04-25 14:17:25 +0800 | [diff] [blame] | 1438 | #endif |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1439 | |
Dave Hansen | 45221ab | 2010-08-19 18:11:37 -0700 | [diff] [blame] | 1440 | /* |
| 1441 | * This value is the sum of all of the kvm instances's |
| 1442 | * kvm->arch.n_used_mmu_pages values. We need a global, |
| 1443 | * aggregate version in order to make the slab shrinker |
| 1444 | * faster |
| 1445 | */ |
| 1446 | static inline void kvm_mod_used_mmu_pages(struct kvm *kvm, int nr) |
| 1447 | { |
| 1448 | kvm->arch.n_used_mmu_pages += nr; |
| 1449 | percpu_counter_add(&kvm_total_used_mmu_pages, nr); |
| 1450 | } |
| 1451 | |
Gleb Natapov | 834be0d | 2013-01-30 16:45:05 +0200 | [diff] [blame] | 1452 | static void kvm_mmu_free_page(struct kvm_mmu_page *sp) |
Avi Kivity | 260746c | 2007-01-05 16:36:49 -0800 | [diff] [blame] | 1453 | { |
Avi Kivity | 4db3531 | 2007-11-21 15:28:32 +0200 | [diff] [blame] | 1454 | ASSERT(is_empty_shadow_page(sp->spt)); |
Xiao Guangrong | 7775834 | 2010-06-04 21:53:54 +0800 | [diff] [blame] | 1455 | hlist_del(&sp->hash_link); |
Xiao Guangrong | bd4c86e | 2011-07-12 03:27:14 +0800 | [diff] [blame] | 1456 | list_del(&sp->link); |
| 1457 | free_page((unsigned long)sp->spt); |
Gleb Natapov | 834be0d | 2013-01-30 16:45:05 +0200 | [diff] [blame] | 1458 | if (!sp->role.direct) |
| 1459 | free_page((unsigned long)sp->gfns); |
Xiao Guangrong | e8ad9a7 | 2010-05-13 10:06:02 +0800 | [diff] [blame] | 1460 | kmem_cache_free(mmu_page_header_cache, sp); |
Avi Kivity | 260746c | 2007-01-05 16:36:49 -0800 | [diff] [blame] | 1461 | } |
| 1462 | |
Avi Kivity | cea0f0e | 2007-01-05 16:36:43 -0800 | [diff] [blame] | 1463 | static unsigned kvm_page_table_hashfn(gfn_t gfn) |
| 1464 | { |
Dong, Eddie | 1ae0a13 | 2008-01-07 13:20:25 +0200 | [diff] [blame] | 1465 | return gfn & ((1 << KVM_MMU_HASH_SHIFT) - 1); |
Avi Kivity | cea0f0e | 2007-01-05 16:36:43 -0800 | [diff] [blame] | 1466 | } |
| 1467 | |
Xiao Guangrong | 67052b3 | 2011-05-15 23:27:08 +0800 | [diff] [blame] | 1468 | static void mmu_page_add_parent_pte(struct kvm_vcpu *vcpu, |
| 1469 | struct kvm_mmu_page *sp, u64 *parent_pte) |
| 1470 | { |
| 1471 | if (!parent_pte) |
| 1472 | return; |
| 1473 | |
| 1474 | pte_list_add(vcpu, parent_pte, &sp->parent_ptes); |
| 1475 | } |
| 1476 | |
| 1477 | static void mmu_page_remove_parent_pte(struct kvm_mmu_page *sp, |
| 1478 | u64 *parent_pte) |
| 1479 | { |
| 1480 | pte_list_remove(parent_pte, &sp->parent_ptes); |
| 1481 | } |
| 1482 | |
Xiao Guangrong | bcdd9a9 | 2011-05-15 23:28:29 +0800 | [diff] [blame] | 1483 | static void drop_parent_pte(struct kvm_mmu_page *sp, |
| 1484 | u64 *parent_pte) |
| 1485 | { |
| 1486 | mmu_page_remove_parent_pte(sp, parent_pte); |
Xiao Guangrong | 1df9f2d | 2011-07-12 03:30:35 +0800 | [diff] [blame] | 1487 | mmu_spte_clear_no_track(parent_pte); |
Xiao Guangrong | bcdd9a9 | 2011-05-15 23:28:29 +0800 | [diff] [blame] | 1488 | } |
| 1489 | |
Avi Kivity | 25c0de2 | 2007-01-05 16:36:42 -0800 | [diff] [blame] | 1490 | 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] | 1491 | u64 *parent_pte, int direct) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1492 | { |
Avi Kivity | 4db3531 | 2007-11-21 15:28:32 +0200 | [diff] [blame] | 1493 | struct kvm_mmu_page *sp; |
Takuya Yoshikawa | 80feb89 | 2012-05-29 23:54:26 +0900 | [diff] [blame] | 1494 | sp = mmu_memory_cache_alloc(&vcpu->arch.mmu_page_header_cache); |
| 1495 | sp->spt = mmu_memory_cache_alloc(&vcpu->arch.mmu_page_cache); |
Lai Jiangshan | 2032a93 | 2010-05-26 16:49:59 +0800 | [diff] [blame] | 1496 | if (!direct) |
Takuya Yoshikawa | 80feb89 | 2012-05-29 23:54:26 +0900 | [diff] [blame] | 1497 | sp->gfns = mmu_memory_cache_alloc(&vcpu->arch.mmu_page_cache); |
Avi Kivity | 4db3531 | 2007-11-21 15:28:32 +0200 | [diff] [blame] | 1498 | set_page_private(virt_to_page(sp->spt), (unsigned long)sp); |
Zhang Xiantao | f05e70a | 2007-12-14 10:01:48 +0800 | [diff] [blame] | 1499 | list_add(&sp->link, &vcpu->kvm->arch.active_mmu_pages); |
Xiao Guangrong | 67052b3 | 2011-05-15 23:27:08 +0800 | [diff] [blame] | 1500 | sp->parent_ptes = 0; |
| 1501 | mmu_page_add_parent_pte(vcpu, sp, parent_pte); |
Dave Hansen | 45221ab | 2010-08-19 18:11:37 -0700 | [diff] [blame] | 1502 | kvm_mod_used_mmu_pages(vcpu->kvm, +1); |
Avi Kivity | 4db3531 | 2007-11-21 15:28:32 +0200 | [diff] [blame] | 1503 | return sp; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1504 | } |
| 1505 | |
Xiao Guangrong | 67052b3 | 2011-05-15 23:27:08 +0800 | [diff] [blame] | 1506 | static void mark_unsync(u64 *spte); |
Xiao Guangrong | 6b18493 | 2010-04-16 21:29:17 +0800 | [diff] [blame] | 1507 | static void kvm_mmu_mark_parents_unsync(struct kvm_mmu_page *sp) |
Marcelo Tosatti | 0074ff6 | 2008-09-23 13:18:40 -0300 | [diff] [blame] | 1508 | { |
Xiao Guangrong | 67052b3 | 2011-05-15 23:27:08 +0800 | [diff] [blame] | 1509 | pte_list_walk(&sp->parent_ptes, mark_unsync); |
Xiao Guangrong | 1047df1 | 2010-06-11 21:35:15 +0800 | [diff] [blame] | 1510 | } |
| 1511 | |
Xiao Guangrong | 67052b3 | 2011-05-15 23:27:08 +0800 | [diff] [blame] | 1512 | static void mark_unsync(u64 *spte) |
Xiao Guangrong | 1047df1 | 2010-06-11 21:35:15 +0800 | [diff] [blame] | 1513 | { |
Xiao Guangrong | 67052b3 | 2011-05-15 23:27:08 +0800 | [diff] [blame] | 1514 | struct kvm_mmu_page *sp; |
Xiao Guangrong | 1047df1 | 2010-06-11 21:35:15 +0800 | [diff] [blame] | 1515 | unsigned int index; |
| 1516 | |
Xiao Guangrong | 67052b3 | 2011-05-15 23:27:08 +0800 | [diff] [blame] | 1517 | sp = page_header(__pa(spte)); |
Xiao Guangrong | 1047df1 | 2010-06-11 21:35:15 +0800 | [diff] [blame] | 1518 | index = spte - sp->spt; |
| 1519 | if (__test_and_set_bit(index, sp->unsync_child_bitmap)) |
| 1520 | return; |
| 1521 | if (sp->unsync_children++) |
| 1522 | return; |
| 1523 | kvm_mmu_mark_parents_unsync(sp); |
Marcelo Tosatti | 0074ff6 | 2008-09-23 13:18:40 -0300 | [diff] [blame] | 1524 | } |
| 1525 | |
Marcelo Tosatti | e8bc217 | 2008-09-23 13:18:33 -0300 | [diff] [blame] | 1526 | static int nonpaging_sync_page(struct kvm_vcpu *vcpu, |
Xiao Guangrong | a4a8e6f | 2010-11-19 17:04:03 +0800 | [diff] [blame] | 1527 | struct kvm_mmu_page *sp) |
Marcelo Tosatti | e8bc217 | 2008-09-23 13:18:33 -0300 | [diff] [blame] | 1528 | { |
| 1529 | return 1; |
| 1530 | } |
| 1531 | |
Marcelo Tosatti | a705289 | 2008-09-23 13:18:35 -0300 | [diff] [blame] | 1532 | static void nonpaging_invlpg(struct kvm_vcpu *vcpu, gva_t gva) |
| 1533 | { |
| 1534 | } |
| 1535 | |
Xiao Guangrong | 0f53b5b | 2011-03-09 15:43:51 +0800 | [diff] [blame] | 1536 | static void nonpaging_update_pte(struct kvm_vcpu *vcpu, |
| 1537 | struct kvm_mmu_page *sp, u64 *spte, |
Xiao Guangrong | 7c56252 | 2011-03-28 10:29:27 +0800 | [diff] [blame] | 1538 | const void *pte) |
Xiao Guangrong | 0f53b5b | 2011-03-09 15:43:51 +0800 | [diff] [blame] | 1539 | { |
| 1540 | WARN_ON(1); |
| 1541 | } |
| 1542 | |
Marcelo Tosatti | 60c8aec | 2008-12-01 22:32:02 -0200 | [diff] [blame] | 1543 | #define KVM_PAGE_ARRAY_NR 16 |
| 1544 | |
| 1545 | struct kvm_mmu_pages { |
| 1546 | struct mmu_page_and_offset { |
| 1547 | struct kvm_mmu_page *sp; |
| 1548 | unsigned int idx; |
| 1549 | } page[KVM_PAGE_ARRAY_NR]; |
| 1550 | unsigned int nr; |
| 1551 | }; |
| 1552 | |
Hannes Eder | cded19f | 2009-02-21 02:19:13 +0100 | [diff] [blame] | 1553 | static int mmu_pages_add(struct kvm_mmu_pages *pvec, struct kvm_mmu_page *sp, |
| 1554 | int idx) |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 1555 | { |
Marcelo Tosatti | 60c8aec | 2008-12-01 22:32:02 -0200 | [diff] [blame] | 1556 | int i; |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 1557 | |
Marcelo Tosatti | 60c8aec | 2008-12-01 22:32:02 -0200 | [diff] [blame] | 1558 | if (sp->unsync) |
| 1559 | for (i=0; i < pvec->nr; i++) |
| 1560 | if (pvec->page[i].sp == sp) |
| 1561 | return 0; |
| 1562 | |
| 1563 | pvec->page[pvec->nr].sp = sp; |
| 1564 | pvec->page[pvec->nr].idx = idx; |
| 1565 | pvec->nr++; |
| 1566 | return (pvec->nr == KVM_PAGE_ARRAY_NR); |
| 1567 | } |
| 1568 | |
| 1569 | static int __mmu_unsync_walk(struct kvm_mmu_page *sp, |
| 1570 | struct kvm_mmu_pages *pvec) |
| 1571 | { |
| 1572 | int i, ret, nr_unsync_leaf = 0; |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 1573 | |
Takuya Yoshikawa | 37178b8 | 2011-11-29 14:02:45 +0900 | [diff] [blame] | 1574 | for_each_set_bit(i, sp->unsync_child_bitmap, 512) { |
Xiao Guangrong | 7a8f1a7 | 2010-06-11 21:34:04 +0800 | [diff] [blame] | 1575 | struct kvm_mmu_page *child; |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 1576 | u64 ent = sp->spt[i]; |
| 1577 | |
Xiao Guangrong | 7a8f1a7 | 2010-06-11 21:34:04 +0800 | [diff] [blame] | 1578 | if (!is_shadow_present_pte(ent) || is_large_pte(ent)) |
| 1579 | goto clear_child_bitmap; |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 1580 | |
Xiao Guangrong | 7a8f1a7 | 2010-06-11 21:34:04 +0800 | [diff] [blame] | 1581 | child = page_header(ent & PT64_BASE_ADDR_MASK); |
Marcelo Tosatti | 60c8aec | 2008-12-01 22:32:02 -0200 | [diff] [blame] | 1582 | |
Xiao Guangrong | 7a8f1a7 | 2010-06-11 21:34:04 +0800 | [diff] [blame] | 1583 | if (child->unsync_children) { |
| 1584 | if (mmu_pages_add(pvec, child, i)) |
| 1585 | return -ENOSPC; |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 1586 | |
Xiao Guangrong | 7a8f1a7 | 2010-06-11 21:34:04 +0800 | [diff] [blame] | 1587 | ret = __mmu_unsync_walk(child, pvec); |
| 1588 | if (!ret) |
| 1589 | goto clear_child_bitmap; |
| 1590 | else if (ret > 0) |
| 1591 | nr_unsync_leaf += ret; |
| 1592 | else |
| 1593 | return ret; |
| 1594 | } else if (child->unsync) { |
| 1595 | nr_unsync_leaf++; |
| 1596 | if (mmu_pages_add(pvec, child, i)) |
| 1597 | return -ENOSPC; |
| 1598 | } else |
| 1599 | goto clear_child_bitmap; |
| 1600 | |
| 1601 | continue; |
| 1602 | |
| 1603 | clear_child_bitmap: |
| 1604 | __clear_bit(i, sp->unsync_child_bitmap); |
| 1605 | sp->unsync_children--; |
| 1606 | WARN_ON((int)sp->unsync_children < 0); |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 1607 | } |
| 1608 | |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 1609 | |
Marcelo Tosatti | 60c8aec | 2008-12-01 22:32:02 -0200 | [diff] [blame] | 1610 | return nr_unsync_leaf; |
| 1611 | } |
| 1612 | |
| 1613 | static int mmu_unsync_walk(struct kvm_mmu_page *sp, |
| 1614 | struct kvm_mmu_pages *pvec) |
| 1615 | { |
| 1616 | if (!sp->unsync_children) |
| 1617 | return 0; |
| 1618 | |
| 1619 | mmu_pages_add(pvec, sp, 0); |
| 1620 | return __mmu_unsync_walk(sp, pvec); |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 1621 | } |
| 1622 | |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 1623 | static void kvm_unlink_unsync_page(struct kvm *kvm, struct kvm_mmu_page *sp) |
| 1624 | { |
| 1625 | WARN_ON(!sp->unsync); |
Xiao Guangrong | 5e1b3dd | 2010-04-28 11:55:06 +0800 | [diff] [blame] | 1626 | trace_kvm_mmu_sync_page(sp); |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 1627 | sp->unsync = 0; |
| 1628 | --kvm->stat.mmu_unsync; |
| 1629 | } |
| 1630 | |
Xiao Guangrong | 7775834 | 2010-06-04 21:53:54 +0800 | [diff] [blame] | 1631 | static int kvm_mmu_prepare_zap_page(struct kvm *kvm, struct kvm_mmu_page *sp, |
| 1632 | struct list_head *invalid_list); |
| 1633 | static void kvm_mmu_commit_zap_page(struct kvm *kvm, |
| 1634 | struct list_head *invalid_list); |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 1635 | |
Xiao Guangrong | f41d335 | 2010-06-04 21:56:11 +0800 | [diff] [blame] | 1636 | #define for_each_gfn_sp(kvm, sp, gfn, pos) \ |
| 1637 | hlist_for_each_entry(sp, pos, \ |
Xiao Guangrong | 7ae680e | 2010-06-04 21:53:07 +0800 | [diff] [blame] | 1638 | &(kvm)->arch.mmu_page_hash[kvm_page_table_hashfn(gfn)], hash_link) \ |
| 1639 | if ((sp)->gfn != (gfn)) {} else |
| 1640 | |
Xiao Guangrong | f41d335 | 2010-06-04 21:56:11 +0800 | [diff] [blame] | 1641 | #define for_each_gfn_indirect_valid_sp(kvm, sp, gfn, pos) \ |
| 1642 | hlist_for_each_entry(sp, pos, \ |
Xiao Guangrong | 7ae680e | 2010-06-04 21:53:07 +0800 | [diff] [blame] | 1643 | &(kvm)->arch.mmu_page_hash[kvm_page_table_hashfn(gfn)], hash_link) \ |
| 1644 | if ((sp)->gfn != (gfn) || (sp)->role.direct || \ |
| 1645 | (sp)->role.invalid) {} else |
| 1646 | |
Xiao Guangrong | f918b44 | 2010-06-11 21:30:36 +0800 | [diff] [blame] | 1647 | /* @sp->gfn should be write-protected at the call site */ |
Xiao Guangrong | 1d9dc7e | 2010-05-15 18:51:24 +0800 | [diff] [blame] | 1648 | 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] | 1649 | struct list_head *invalid_list, bool clear_unsync) |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 1650 | { |
Avi Kivity | 5b7e010 | 2010-04-14 19:20:03 +0300 | [diff] [blame] | 1651 | if (sp->role.cr4_pae != !!is_pae(vcpu)) { |
Xiao Guangrong | d98ba05 | 2010-06-04 21:55:29 +0800 | [diff] [blame] | 1652 | kvm_mmu_prepare_zap_page(vcpu->kvm, sp, invalid_list); |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 1653 | return 1; |
| 1654 | } |
| 1655 | |
Xiao Guangrong | f918b44 | 2010-06-11 21:30:36 +0800 | [diff] [blame] | 1656 | if (clear_unsync) |
Xiao Guangrong | 1d9dc7e | 2010-05-15 18:51:24 +0800 | [diff] [blame] | 1657 | kvm_unlink_unsync_page(vcpu->kvm, sp); |
Xiao Guangrong | 1d9dc7e | 2010-05-15 18:51:24 +0800 | [diff] [blame] | 1658 | |
Xiao Guangrong | a4a8e6f | 2010-11-19 17:04:03 +0800 | [diff] [blame] | 1659 | if (vcpu->arch.mmu.sync_page(vcpu, sp)) { |
Xiao Guangrong | d98ba05 | 2010-06-04 21:55:29 +0800 | [diff] [blame] | 1660 | kvm_mmu_prepare_zap_page(vcpu->kvm, sp, invalid_list); |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 1661 | return 1; |
| 1662 | } |
| 1663 | |
| 1664 | kvm_mmu_flush_tlb(vcpu); |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 1665 | return 0; |
| 1666 | } |
| 1667 | |
Xiao Guangrong | 1d9dc7e | 2010-05-15 18:51:24 +0800 | [diff] [blame] | 1668 | static int kvm_sync_page_transient(struct kvm_vcpu *vcpu, |
| 1669 | struct kvm_mmu_page *sp) |
| 1670 | { |
Xiao Guangrong | d98ba05 | 2010-06-04 21:55:29 +0800 | [diff] [blame] | 1671 | LIST_HEAD(invalid_list); |
Xiao Guangrong | 1d9dc7e | 2010-05-15 18:51:24 +0800 | [diff] [blame] | 1672 | int ret; |
| 1673 | |
Xiao Guangrong | d98ba05 | 2010-06-04 21:55:29 +0800 | [diff] [blame] | 1674 | ret = __kvm_sync_page(vcpu, sp, &invalid_list, false); |
Xiao Guangrong | be71e06 | 2010-06-11 21:31:38 +0800 | [diff] [blame] | 1675 | if (ret) |
Xiao Guangrong | d98ba05 | 2010-06-04 21:55:29 +0800 | [diff] [blame] | 1676 | kvm_mmu_commit_zap_page(vcpu->kvm, &invalid_list); |
| 1677 | |
Xiao Guangrong | 1d9dc7e | 2010-05-15 18:51:24 +0800 | [diff] [blame] | 1678 | return ret; |
| 1679 | } |
| 1680 | |
Xiao Guangrong | e37fa78 | 2011-11-30 17:43:24 +0800 | [diff] [blame] | 1681 | #ifdef CONFIG_KVM_MMU_AUDIT |
| 1682 | #include "mmu_audit.c" |
| 1683 | #else |
| 1684 | static void kvm_mmu_audit(struct kvm_vcpu *vcpu, int point) { } |
| 1685 | static void mmu_audit_disable(void) { } |
| 1686 | #endif |
| 1687 | |
Xiao Guangrong | d98ba05 | 2010-06-04 21:55:29 +0800 | [diff] [blame] | 1688 | static int kvm_sync_page(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp, |
| 1689 | struct list_head *invalid_list) |
Xiao Guangrong | 1d9dc7e | 2010-05-15 18:51:24 +0800 | [diff] [blame] | 1690 | { |
Xiao Guangrong | d98ba05 | 2010-06-04 21:55:29 +0800 | [diff] [blame] | 1691 | return __kvm_sync_page(vcpu, sp, invalid_list, true); |
Xiao Guangrong | 1d9dc7e | 2010-05-15 18:51:24 +0800 | [diff] [blame] | 1692 | } |
| 1693 | |
Xiao Guangrong | 9f1a122 | 2010-05-24 15:41:33 +0800 | [diff] [blame] | 1694 | /* @gfn should be write-protected at the call site */ |
| 1695 | static void kvm_sync_pages(struct kvm_vcpu *vcpu, gfn_t gfn) |
| 1696 | { |
Xiao Guangrong | 9f1a122 | 2010-05-24 15:41:33 +0800 | [diff] [blame] | 1697 | struct kvm_mmu_page *s; |
Xiao Guangrong | f41d335 | 2010-06-04 21:56:11 +0800 | [diff] [blame] | 1698 | struct hlist_node *node; |
Xiao Guangrong | d98ba05 | 2010-06-04 21:55:29 +0800 | [diff] [blame] | 1699 | LIST_HEAD(invalid_list); |
Xiao Guangrong | 9f1a122 | 2010-05-24 15:41:33 +0800 | [diff] [blame] | 1700 | bool flush = false; |
| 1701 | |
Xiao Guangrong | f41d335 | 2010-06-04 21:56:11 +0800 | [diff] [blame] | 1702 | for_each_gfn_indirect_valid_sp(vcpu->kvm, s, gfn, node) { |
Xiao Guangrong | 7ae680e | 2010-06-04 21:53:07 +0800 | [diff] [blame] | 1703 | if (!s->unsync) |
Xiao Guangrong | 9f1a122 | 2010-05-24 15:41:33 +0800 | [diff] [blame] | 1704 | continue; |
| 1705 | |
| 1706 | WARN_ON(s->role.level != PT_PAGE_TABLE_LEVEL); |
Xiao Guangrong | a4a8e6f | 2010-11-19 17:04:03 +0800 | [diff] [blame] | 1707 | kvm_unlink_unsync_page(vcpu->kvm, s); |
Xiao Guangrong | 9f1a122 | 2010-05-24 15:41:33 +0800 | [diff] [blame] | 1708 | if ((s->role.cr4_pae != !!is_pae(vcpu)) || |
Xiao Guangrong | a4a8e6f | 2010-11-19 17:04:03 +0800 | [diff] [blame] | 1709 | (vcpu->arch.mmu.sync_page(vcpu, s))) { |
Xiao Guangrong | d98ba05 | 2010-06-04 21:55:29 +0800 | [diff] [blame] | 1710 | kvm_mmu_prepare_zap_page(vcpu->kvm, s, &invalid_list); |
Xiao Guangrong | 9f1a122 | 2010-05-24 15:41:33 +0800 | [diff] [blame] | 1711 | continue; |
| 1712 | } |
Xiao Guangrong | 9f1a122 | 2010-05-24 15:41:33 +0800 | [diff] [blame] | 1713 | flush = true; |
| 1714 | } |
| 1715 | |
Xiao Guangrong | d98ba05 | 2010-06-04 21:55:29 +0800 | [diff] [blame] | 1716 | kvm_mmu_commit_zap_page(vcpu->kvm, &invalid_list); |
Xiao Guangrong | 9f1a122 | 2010-05-24 15:41:33 +0800 | [diff] [blame] | 1717 | if (flush) |
| 1718 | kvm_mmu_flush_tlb(vcpu); |
| 1719 | } |
| 1720 | |
Marcelo Tosatti | 60c8aec | 2008-12-01 22:32:02 -0200 | [diff] [blame] | 1721 | struct mmu_page_path { |
| 1722 | struct kvm_mmu_page *parent[PT64_ROOT_LEVEL-1]; |
| 1723 | unsigned int idx[PT64_ROOT_LEVEL-1]; |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 1724 | }; |
| 1725 | |
Marcelo Tosatti | 60c8aec | 2008-12-01 22:32:02 -0200 | [diff] [blame] | 1726 | #define for_each_sp(pvec, sp, parents, i) \ |
| 1727 | for (i = mmu_pages_next(&pvec, &parents, -1), \ |
| 1728 | sp = pvec.page[i].sp; \ |
| 1729 | i < pvec.nr && ({ sp = pvec.page[i].sp; 1;}); \ |
| 1730 | i = mmu_pages_next(&pvec, &parents, i)) |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 1731 | |
Hannes Eder | cded19f | 2009-02-21 02:19:13 +0100 | [diff] [blame] | 1732 | static int mmu_pages_next(struct kvm_mmu_pages *pvec, |
| 1733 | struct mmu_page_path *parents, |
| 1734 | int i) |
Marcelo Tosatti | 60c8aec | 2008-12-01 22:32:02 -0200 | [diff] [blame] | 1735 | { |
| 1736 | int n; |
| 1737 | |
| 1738 | for (n = i+1; n < pvec->nr; n++) { |
| 1739 | struct kvm_mmu_page *sp = pvec->page[n].sp; |
| 1740 | |
| 1741 | if (sp->role.level == PT_PAGE_TABLE_LEVEL) { |
| 1742 | parents->idx[0] = pvec->page[n].idx; |
| 1743 | return n; |
| 1744 | } |
| 1745 | |
| 1746 | parents->parent[sp->role.level-2] = sp; |
| 1747 | parents->idx[sp->role.level-1] = pvec->page[n].idx; |
| 1748 | } |
| 1749 | |
| 1750 | return n; |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 1751 | } |
| 1752 | |
Hannes Eder | cded19f | 2009-02-21 02:19:13 +0100 | [diff] [blame] | 1753 | static void mmu_pages_clear_parents(struct mmu_page_path *parents) |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 1754 | { |
Marcelo Tosatti | 60c8aec | 2008-12-01 22:32:02 -0200 | [diff] [blame] | 1755 | struct kvm_mmu_page *sp; |
| 1756 | unsigned int level = 0; |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 1757 | |
Marcelo Tosatti | 60c8aec | 2008-12-01 22:32:02 -0200 | [diff] [blame] | 1758 | do { |
| 1759 | unsigned int idx = parents->idx[level]; |
| 1760 | |
| 1761 | sp = parents->parent[level]; |
| 1762 | if (!sp) |
| 1763 | return; |
| 1764 | |
| 1765 | --sp->unsync_children; |
| 1766 | WARN_ON((int)sp->unsync_children < 0); |
| 1767 | __clear_bit(idx, sp->unsync_child_bitmap); |
| 1768 | level++; |
| 1769 | } while (level < PT64_ROOT_LEVEL-1 && !sp->unsync_children); |
| 1770 | } |
| 1771 | |
| 1772 | static void kvm_mmu_pages_init(struct kvm_mmu_page *parent, |
| 1773 | struct mmu_page_path *parents, |
| 1774 | struct kvm_mmu_pages *pvec) |
| 1775 | { |
| 1776 | parents->parent[parent->role.level-1] = NULL; |
| 1777 | pvec->nr = 0; |
| 1778 | } |
| 1779 | |
| 1780 | static void mmu_sync_children(struct kvm_vcpu *vcpu, |
| 1781 | struct kvm_mmu_page *parent) |
| 1782 | { |
| 1783 | int i; |
| 1784 | struct kvm_mmu_page *sp; |
| 1785 | struct mmu_page_path parents; |
| 1786 | struct kvm_mmu_pages pages; |
Xiao Guangrong | d98ba05 | 2010-06-04 21:55:29 +0800 | [diff] [blame] | 1787 | LIST_HEAD(invalid_list); |
Marcelo Tosatti | 60c8aec | 2008-12-01 22:32:02 -0200 | [diff] [blame] | 1788 | |
| 1789 | kvm_mmu_pages_init(parent, &parents, &pages); |
| 1790 | while (mmu_unsync_walk(parent, &pages)) { |
Xiao Guangrong | 2f84569 | 2012-06-20 15:56:53 +0800 | [diff] [blame] | 1791 | bool protected = false; |
Marcelo Tosatti | b1a3682 | 2008-12-01 22:32:03 -0200 | [diff] [blame] | 1792 | |
| 1793 | for_each_sp(pages, sp, parents, i) |
| 1794 | protected |= rmap_write_protect(vcpu->kvm, sp->gfn); |
| 1795 | |
| 1796 | if (protected) |
| 1797 | kvm_flush_remote_tlbs(vcpu->kvm); |
| 1798 | |
Marcelo Tosatti | 60c8aec | 2008-12-01 22:32:02 -0200 | [diff] [blame] | 1799 | for_each_sp(pages, sp, parents, i) { |
Xiao Guangrong | d98ba05 | 2010-06-04 21:55:29 +0800 | [diff] [blame] | 1800 | kvm_sync_page(vcpu, sp, &invalid_list); |
Marcelo Tosatti | 60c8aec | 2008-12-01 22:32:02 -0200 | [diff] [blame] | 1801 | mmu_pages_clear_parents(&parents); |
| 1802 | } |
Xiao Guangrong | d98ba05 | 2010-06-04 21:55:29 +0800 | [diff] [blame] | 1803 | kvm_mmu_commit_zap_page(vcpu->kvm, &invalid_list); |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 1804 | cond_resched_lock(&vcpu->kvm->mmu_lock); |
Marcelo Tosatti | 60c8aec | 2008-12-01 22:32:02 -0200 | [diff] [blame] | 1805 | kvm_mmu_pages_init(parent, &parents, &pages); |
| 1806 | } |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 1807 | } |
| 1808 | |
Xiao Guangrong | c370795 | 2011-07-12 03:28:04 +0800 | [diff] [blame] | 1809 | static void init_shadow_page_table(struct kvm_mmu_page *sp) |
| 1810 | { |
| 1811 | int i; |
| 1812 | |
| 1813 | for (i = 0; i < PT64_ENT_PER_PAGE; ++i) |
| 1814 | sp->spt[i] = 0ull; |
| 1815 | } |
| 1816 | |
Xiao Guangrong | a30f47c | 2011-09-22 16:58:36 +0800 | [diff] [blame] | 1817 | static void __clear_sp_write_flooding_count(struct kvm_mmu_page *sp) |
| 1818 | { |
| 1819 | sp->write_flooding_count = 0; |
| 1820 | } |
| 1821 | |
| 1822 | static void clear_sp_write_flooding_count(u64 *spte) |
| 1823 | { |
| 1824 | struct kvm_mmu_page *sp = page_header(__pa(spte)); |
| 1825 | |
| 1826 | __clear_sp_write_flooding_count(sp); |
| 1827 | } |
| 1828 | |
Avi Kivity | cea0f0e | 2007-01-05 16:36:43 -0800 | [diff] [blame] | 1829 | static struct kvm_mmu_page *kvm_mmu_get_page(struct kvm_vcpu *vcpu, |
| 1830 | gfn_t gfn, |
| 1831 | gva_t gaddr, |
| 1832 | unsigned level, |
Avi Kivity | f6e2c02 | 2009-01-11 13:02:10 +0200 | [diff] [blame] | 1833 | int direct, |
Avi Kivity | 41074d0 | 2007-12-09 17:00:02 +0200 | [diff] [blame] | 1834 | unsigned access, |
Avi Kivity | f7d9c7b | 2008-02-26 22:12:10 +0200 | [diff] [blame] | 1835 | u64 *parent_pte) |
Avi Kivity | cea0f0e | 2007-01-05 16:36:43 -0800 | [diff] [blame] | 1836 | { |
| 1837 | union kvm_mmu_page_role role; |
Avi Kivity | cea0f0e | 2007-01-05 16:36:43 -0800 | [diff] [blame] | 1838 | unsigned quadrant; |
Xiao Guangrong | 9f1a122 | 2010-05-24 15:41:33 +0800 | [diff] [blame] | 1839 | struct kvm_mmu_page *sp; |
Xiao Guangrong | f41d335 | 2010-06-04 21:56:11 +0800 | [diff] [blame] | 1840 | struct hlist_node *node; |
Xiao Guangrong | 9f1a122 | 2010-05-24 15:41:33 +0800 | [diff] [blame] | 1841 | bool need_sync = false; |
Avi Kivity | cea0f0e | 2007-01-05 16:36:43 -0800 | [diff] [blame] | 1842 | |
Avi Kivity | a770f6f | 2008-12-21 19:20:09 +0200 | [diff] [blame] | 1843 | role = vcpu->arch.mmu.base_role; |
Avi Kivity | cea0f0e | 2007-01-05 16:36:43 -0800 | [diff] [blame] | 1844 | role.level = level; |
Avi Kivity | f6e2c02 | 2009-01-11 13:02:10 +0200 | [diff] [blame] | 1845 | role.direct = direct; |
Avi Kivity | 84b0c8c | 2010-03-14 10:16:40 +0200 | [diff] [blame] | 1846 | if (role.direct) |
Avi Kivity | 5b7e010 | 2010-04-14 19:20:03 +0300 | [diff] [blame] | 1847 | role.cr4_pae = 0; |
Avi Kivity | 41074d0 | 2007-12-09 17:00:02 +0200 | [diff] [blame] | 1848 | role.access = access; |
Joerg Roedel | c5a78f2b | 2010-09-10 17:30:39 +0200 | [diff] [blame] | 1849 | if (!vcpu->arch.mmu.direct_map |
| 1850 | && vcpu->arch.mmu.root_level <= PT32_ROOT_LEVEL) { |
Avi Kivity | cea0f0e | 2007-01-05 16:36:43 -0800 | [diff] [blame] | 1851 | quadrant = gaddr >> (PAGE_SHIFT + (PT64_PT_BITS * level)); |
| 1852 | quadrant &= (1 << ((PT32_PT_BITS - PT64_PT_BITS) * level)) - 1; |
| 1853 | role.quadrant = quadrant; |
| 1854 | } |
Xiao Guangrong | f41d335 | 2010-06-04 21:56:11 +0800 | [diff] [blame] | 1855 | for_each_gfn_sp(vcpu->kvm, sp, gfn, node) { |
Xiao Guangrong | 7ae680e | 2010-06-04 21:53:07 +0800 | [diff] [blame] | 1856 | if (!need_sync && sp->unsync) |
| 1857 | need_sync = true; |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 1858 | |
Xiao Guangrong | 7ae680e | 2010-06-04 21:53:07 +0800 | [diff] [blame] | 1859 | if (sp->role.word != role.word) |
| 1860 | continue; |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 1861 | |
Xiao Guangrong | 7ae680e | 2010-06-04 21:53:07 +0800 | [diff] [blame] | 1862 | if (sp->unsync && kvm_sync_page_transient(vcpu, sp)) |
| 1863 | break; |
Xiao Guangrong | e02aa90 | 2010-05-15 18:52:34 +0800 | [diff] [blame] | 1864 | |
Xiao Guangrong | 7ae680e | 2010-06-04 21:53:07 +0800 | [diff] [blame] | 1865 | mmu_page_add_parent_pte(vcpu, sp, parent_pte); |
| 1866 | if (sp->unsync_children) { |
Avi Kivity | a8eeb04 | 2010-05-10 12:34:53 +0300 | [diff] [blame] | 1867 | kvm_make_request(KVM_REQ_MMU_SYNC, vcpu); |
Xiao Guangrong | 7ae680e | 2010-06-04 21:53:07 +0800 | [diff] [blame] | 1868 | kvm_mmu_mark_parents_unsync(sp); |
| 1869 | } else if (sp->unsync) |
| 1870 | kvm_mmu_mark_parents_unsync(sp); |
Xiao Guangrong | e02aa90 | 2010-05-15 18:52:34 +0800 | [diff] [blame] | 1871 | |
Xiao Guangrong | a30f47c | 2011-09-22 16:58:36 +0800 | [diff] [blame] | 1872 | __clear_sp_write_flooding_count(sp); |
Xiao Guangrong | 7ae680e | 2010-06-04 21:53:07 +0800 | [diff] [blame] | 1873 | trace_kvm_mmu_get_page(sp, false); |
| 1874 | return sp; |
| 1875 | } |
Avi Kivity | dfc5aa0 | 2007-12-18 19:47:18 +0200 | [diff] [blame] | 1876 | ++vcpu->kvm->stat.mmu_cache_miss; |
Lai Jiangshan | 2032a93 | 2010-05-26 16:49:59 +0800 | [diff] [blame] | 1877 | sp = kvm_mmu_alloc_page(vcpu, parent_pte, direct); |
Avi Kivity | 4db3531 | 2007-11-21 15:28:32 +0200 | [diff] [blame] | 1878 | if (!sp) |
| 1879 | return sp; |
Avi Kivity | 4db3531 | 2007-11-21 15:28:32 +0200 | [diff] [blame] | 1880 | sp->gfn = gfn; |
| 1881 | sp->role = role; |
Xiao Guangrong | 7ae680e | 2010-06-04 21:53:07 +0800 | [diff] [blame] | 1882 | hlist_add_head(&sp->hash_link, |
| 1883 | &vcpu->kvm->arch.mmu_page_hash[kvm_page_table_hashfn(gfn)]); |
Avi Kivity | f6e2c02 | 2009-01-11 13:02:10 +0200 | [diff] [blame] | 1884 | if (!direct) { |
Marcelo Tosatti | b1a3682 | 2008-12-01 22:32:03 -0200 | [diff] [blame] | 1885 | if (rmap_write_protect(vcpu->kvm, gfn)) |
| 1886 | kvm_flush_remote_tlbs(vcpu->kvm); |
Xiao Guangrong | 9f1a122 | 2010-05-24 15:41:33 +0800 | [diff] [blame] | 1887 | if (level > PT_PAGE_TABLE_LEVEL && need_sync) |
| 1888 | kvm_sync_pages(vcpu, gfn); |
| 1889 | |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 1890 | account_shadowed(vcpu->kvm, gfn); |
| 1891 | } |
Xiao Guangrong | c370795 | 2011-07-12 03:28:04 +0800 | [diff] [blame] | 1892 | init_shadow_page_table(sp); |
Avi Kivity | f691fe1 | 2009-07-06 15:58:14 +0300 | [diff] [blame] | 1893 | trace_kvm_mmu_get_page(sp, true); |
Avi Kivity | 4db3531 | 2007-11-21 15:28:32 +0200 | [diff] [blame] | 1894 | return sp; |
Avi Kivity | cea0f0e | 2007-01-05 16:36:43 -0800 | [diff] [blame] | 1895 | } |
| 1896 | |
Avi Kivity | 2d11123 | 2008-12-25 14:39:47 +0200 | [diff] [blame] | 1897 | static void shadow_walk_init(struct kvm_shadow_walk_iterator *iterator, |
| 1898 | struct kvm_vcpu *vcpu, u64 addr) |
| 1899 | { |
| 1900 | iterator->addr = addr; |
| 1901 | iterator->shadow_addr = vcpu->arch.mmu.root_hpa; |
| 1902 | iterator->level = vcpu->arch.mmu.shadow_root_level; |
Joerg Roedel | 81407ca | 2010-09-10 17:31:00 +0200 | [diff] [blame] | 1903 | |
| 1904 | if (iterator->level == PT64_ROOT_LEVEL && |
| 1905 | vcpu->arch.mmu.root_level < PT64_ROOT_LEVEL && |
| 1906 | !vcpu->arch.mmu.direct_map) |
| 1907 | --iterator->level; |
| 1908 | |
Avi Kivity | 2d11123 | 2008-12-25 14:39:47 +0200 | [diff] [blame] | 1909 | if (iterator->level == PT32E_ROOT_LEVEL) { |
| 1910 | iterator->shadow_addr |
| 1911 | = vcpu->arch.mmu.pae_root[(addr >> 30) & 3]; |
| 1912 | iterator->shadow_addr &= PT64_BASE_ADDR_MASK; |
| 1913 | --iterator->level; |
| 1914 | if (!iterator->shadow_addr) |
| 1915 | iterator->level = 0; |
| 1916 | } |
| 1917 | } |
| 1918 | |
| 1919 | static bool shadow_walk_okay(struct kvm_shadow_walk_iterator *iterator) |
| 1920 | { |
| 1921 | if (iterator->level < PT_PAGE_TABLE_LEVEL) |
| 1922 | return false; |
Marcelo Tosatti | 4d88954 | 2009-06-11 12:07:41 -0300 | [diff] [blame] | 1923 | |
Avi Kivity | 2d11123 | 2008-12-25 14:39:47 +0200 | [diff] [blame] | 1924 | iterator->index = SHADOW_PT_INDEX(iterator->addr, iterator->level); |
| 1925 | iterator->sptep = ((u64 *)__va(iterator->shadow_addr)) + iterator->index; |
| 1926 | return true; |
| 1927 | } |
| 1928 | |
Xiao Guangrong | c2a2ac2 | 2011-07-12 03:32:13 +0800 | [diff] [blame] | 1929 | static void __shadow_walk_next(struct kvm_shadow_walk_iterator *iterator, |
| 1930 | u64 spte) |
Avi Kivity | 2d11123 | 2008-12-25 14:39:47 +0200 | [diff] [blame] | 1931 | { |
Xiao Guangrong | c2a2ac2 | 2011-07-12 03:32:13 +0800 | [diff] [blame] | 1932 | if (is_last_spte(spte, iterator->level)) { |
Xiao Guangrong | 052331b | 2011-07-12 03:21:17 +0800 | [diff] [blame] | 1933 | iterator->level = 0; |
| 1934 | return; |
| 1935 | } |
| 1936 | |
Xiao Guangrong | c2a2ac2 | 2011-07-12 03:32:13 +0800 | [diff] [blame] | 1937 | iterator->shadow_addr = spte & PT64_BASE_ADDR_MASK; |
Avi Kivity | 2d11123 | 2008-12-25 14:39:47 +0200 | [diff] [blame] | 1938 | --iterator->level; |
| 1939 | } |
| 1940 | |
Xiao Guangrong | c2a2ac2 | 2011-07-12 03:32:13 +0800 | [diff] [blame] | 1941 | static void shadow_walk_next(struct kvm_shadow_walk_iterator *iterator) |
| 1942 | { |
| 1943 | return __shadow_walk_next(iterator, *iterator->sptep); |
| 1944 | } |
| 1945 | |
Avi Kivity | 32ef26a | 2010-07-13 14:27:04 +0300 | [diff] [blame] | 1946 | static void link_shadow_page(u64 *sptep, struct kvm_mmu_page *sp) |
| 1947 | { |
| 1948 | u64 spte; |
| 1949 | |
| 1950 | spte = __pa(sp->spt) |
| 1951 | | PT_PRESENT_MASK | PT_ACCESSED_MASK |
| 1952 | | PT_WRITABLE_MASK | PT_USER_MASK; |
Xiao Guangrong | 1df9f2d | 2011-07-12 03:30:35 +0800 | [diff] [blame] | 1953 | mmu_spte_set(sptep, spte); |
Avi Kivity | 32ef26a | 2010-07-13 14:27:04 +0300 | [diff] [blame] | 1954 | } |
| 1955 | |
Avi Kivity | a357bd2 | 2010-07-13 14:27:07 +0300 | [diff] [blame] | 1956 | static void validate_direct_spte(struct kvm_vcpu *vcpu, u64 *sptep, |
| 1957 | unsigned direct_access) |
| 1958 | { |
| 1959 | if (is_shadow_present_pte(*sptep) && !is_large_pte(*sptep)) { |
| 1960 | struct kvm_mmu_page *child; |
| 1961 | |
| 1962 | /* |
| 1963 | * For the direct sp, if the guest pte's dirty bit |
| 1964 | * changed form clean to dirty, it will corrupt the |
| 1965 | * sp's access: allow writable in the read-only sp, |
| 1966 | * so we should update the spte at this point to get |
| 1967 | * a new sp with the correct access. |
| 1968 | */ |
| 1969 | child = page_header(*sptep & PT64_BASE_ADDR_MASK); |
| 1970 | if (child->role.access == direct_access) |
| 1971 | return; |
| 1972 | |
Xiao Guangrong | bcdd9a9 | 2011-05-15 23:28:29 +0800 | [diff] [blame] | 1973 | drop_parent_pte(child, sptep); |
Avi Kivity | a357bd2 | 2010-07-13 14:27:07 +0300 | [diff] [blame] | 1974 | kvm_flush_remote_tlbs(vcpu->kvm); |
| 1975 | } |
| 1976 | } |
| 1977 | |
Xiao Guangrong | 505aef8 | 2011-09-22 16:56:06 +0800 | [diff] [blame] | 1978 | 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] | 1979 | u64 *spte) |
| 1980 | { |
| 1981 | u64 pte; |
| 1982 | struct kvm_mmu_page *child; |
| 1983 | |
| 1984 | pte = *spte; |
| 1985 | if (is_shadow_present_pte(pte)) { |
Xiao Guangrong | 505aef8 | 2011-09-22 16:56:06 +0800 | [diff] [blame] | 1986 | if (is_last_spte(pte, sp->role.level)) { |
Xiao Guangrong | c370795 | 2011-07-12 03:28:04 +0800 | [diff] [blame] | 1987 | drop_spte(kvm, spte); |
Xiao Guangrong | 505aef8 | 2011-09-22 16:56:06 +0800 | [diff] [blame] | 1988 | if (is_large_pte(pte)) |
| 1989 | --kvm->stat.lpages; |
| 1990 | } else { |
Xiao Guangrong | 38e3b2b | 2011-05-15 23:27:52 +0800 | [diff] [blame] | 1991 | child = page_header(pte & PT64_BASE_ADDR_MASK); |
Xiao Guangrong | bcdd9a9 | 2011-05-15 23:28:29 +0800 | [diff] [blame] | 1992 | drop_parent_pte(child, spte); |
Xiao Guangrong | 38e3b2b | 2011-05-15 23:27:52 +0800 | [diff] [blame] | 1993 | } |
Xiao Guangrong | 505aef8 | 2011-09-22 16:56:06 +0800 | [diff] [blame] | 1994 | return true; |
| 1995 | } |
| 1996 | |
| 1997 | if (is_mmio_spte(pte)) |
Xiao Guangrong | ce88dec | 2011-07-12 03:33:44 +0800 | [diff] [blame] | 1998 | mmu_spte_clear_no_track(spte); |
Xiao Guangrong | c370795 | 2011-07-12 03:28:04 +0800 | [diff] [blame] | 1999 | |
Xiao Guangrong | 505aef8 | 2011-09-22 16:56:06 +0800 | [diff] [blame] | 2000 | return false; |
Xiao Guangrong | 38e3b2b | 2011-05-15 23:27:52 +0800 | [diff] [blame] | 2001 | } |
| 2002 | |
Avi Kivity | 90cb052 | 2007-07-17 13:04:56 +0300 | [diff] [blame] | 2003 | static void kvm_mmu_page_unlink_children(struct kvm *kvm, |
Avi Kivity | 4db3531 | 2007-11-21 15:28:32 +0200 | [diff] [blame] | 2004 | struct kvm_mmu_page *sp) |
Avi Kivity | a436036 | 2007-01-05 16:36:45 -0800 | [diff] [blame] | 2005 | { |
Avi Kivity | 697fe2e | 2007-01-05 16:36:46 -0800 | [diff] [blame] | 2006 | unsigned i; |
Avi Kivity | 697fe2e | 2007-01-05 16:36:46 -0800 | [diff] [blame] | 2007 | |
Xiao Guangrong | 38e3b2b | 2011-05-15 23:27:52 +0800 | [diff] [blame] | 2008 | for (i = 0; i < PT64_ENT_PER_PAGE; ++i) |
| 2009 | mmu_page_zap_pte(kvm, sp, sp->spt + i); |
Avi Kivity | a436036 | 2007-01-05 16:36:45 -0800 | [diff] [blame] | 2010 | } |
| 2011 | |
Avi Kivity | 4db3531 | 2007-11-21 15:28:32 +0200 | [diff] [blame] | 2012 | 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] | 2013 | { |
Avi Kivity | 4db3531 | 2007-11-21 15:28:32 +0200 | [diff] [blame] | 2014 | mmu_page_remove_parent_pte(sp, parent_pte); |
Avi Kivity | a436036 | 2007-01-05 16:36:45 -0800 | [diff] [blame] | 2015 | } |
| 2016 | |
Avi Kivity | 31aa2b4 | 2008-07-11 17:59:46 +0300 | [diff] [blame] | 2017 | 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] | 2018 | { |
Takuya Yoshikawa | 1e3f42f | 2012-03-21 23:50:34 +0900 | [diff] [blame] | 2019 | u64 *sptep; |
| 2020 | struct rmap_iterator iter; |
Avi Kivity | a436036 | 2007-01-05 16:36:45 -0800 | [diff] [blame] | 2021 | |
Takuya Yoshikawa | 1e3f42f | 2012-03-21 23:50:34 +0900 | [diff] [blame] | 2022 | while ((sptep = rmap_get_first(sp->parent_ptes, &iter))) |
| 2023 | drop_parent_pte(sp, sptep); |
Avi Kivity | 31aa2b4 | 2008-07-11 17:59:46 +0300 | [diff] [blame] | 2024 | } |
| 2025 | |
Marcelo Tosatti | 60c8aec | 2008-12-01 22:32:02 -0200 | [diff] [blame] | 2026 | static int mmu_zap_unsync_children(struct kvm *kvm, |
Xiao Guangrong | 7775834 | 2010-06-04 21:53:54 +0800 | [diff] [blame] | 2027 | struct kvm_mmu_page *parent, |
| 2028 | struct list_head *invalid_list) |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 2029 | { |
Marcelo Tosatti | 60c8aec | 2008-12-01 22:32:02 -0200 | [diff] [blame] | 2030 | int i, zapped = 0; |
| 2031 | struct mmu_page_path parents; |
| 2032 | struct kvm_mmu_pages pages; |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 2033 | |
Marcelo Tosatti | 60c8aec | 2008-12-01 22:32:02 -0200 | [diff] [blame] | 2034 | if (parent->role.level == PT_PAGE_TABLE_LEVEL) |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 2035 | return 0; |
Marcelo Tosatti | 60c8aec | 2008-12-01 22:32:02 -0200 | [diff] [blame] | 2036 | |
| 2037 | kvm_mmu_pages_init(parent, &parents, &pages); |
| 2038 | while (mmu_unsync_walk(parent, &pages)) { |
| 2039 | struct kvm_mmu_page *sp; |
| 2040 | |
| 2041 | for_each_sp(pages, sp, parents, i) { |
Xiao Guangrong | 7775834 | 2010-06-04 21:53:54 +0800 | [diff] [blame] | 2042 | kvm_mmu_prepare_zap_page(kvm, sp, invalid_list); |
Marcelo Tosatti | 60c8aec | 2008-12-01 22:32:02 -0200 | [diff] [blame] | 2043 | mmu_pages_clear_parents(&parents); |
Xiao Guangrong | 77662e0 | 2010-04-16 16:34:42 +0800 | [diff] [blame] | 2044 | zapped++; |
Marcelo Tosatti | 60c8aec | 2008-12-01 22:32:02 -0200 | [diff] [blame] | 2045 | } |
Marcelo Tosatti | 60c8aec | 2008-12-01 22:32:02 -0200 | [diff] [blame] | 2046 | kvm_mmu_pages_init(parent, &parents, &pages); |
| 2047 | } |
| 2048 | |
| 2049 | return zapped; |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 2050 | } |
| 2051 | |
Xiao Guangrong | 7775834 | 2010-06-04 21:53:54 +0800 | [diff] [blame] | 2052 | static int kvm_mmu_prepare_zap_page(struct kvm *kvm, struct kvm_mmu_page *sp, |
| 2053 | struct list_head *invalid_list) |
Avi Kivity | 31aa2b4 | 2008-07-11 17:59:46 +0300 | [diff] [blame] | 2054 | { |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 2055 | int ret; |
Avi Kivity | f691fe1 | 2009-07-06 15:58:14 +0300 | [diff] [blame] | 2056 | |
Xiao Guangrong | 7775834 | 2010-06-04 21:53:54 +0800 | [diff] [blame] | 2057 | trace_kvm_mmu_prepare_zap_page(sp); |
Avi Kivity | 31aa2b4 | 2008-07-11 17:59:46 +0300 | [diff] [blame] | 2058 | ++kvm->stat.mmu_shadow_zapped; |
Xiao Guangrong | 7775834 | 2010-06-04 21:53:54 +0800 | [diff] [blame] | 2059 | ret = mmu_zap_unsync_children(kvm, sp, invalid_list); |
Avi Kivity | 4db3531 | 2007-11-21 15:28:32 +0200 | [diff] [blame] | 2060 | kvm_mmu_page_unlink_children(kvm, sp); |
Avi Kivity | 31aa2b4 | 2008-07-11 17:59:46 +0300 | [diff] [blame] | 2061 | kvm_mmu_unlink_parents(kvm, sp); |
Avi Kivity | f6e2c02 | 2009-01-11 13:02:10 +0200 | [diff] [blame] | 2062 | if (!sp->role.invalid && !sp->role.direct) |
Avi Kivity | 5b5c6a5 | 2008-07-11 18:07:26 +0300 | [diff] [blame] | 2063 | unaccount_shadowed(kvm, sp->gfn); |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 2064 | if (sp->unsync) |
| 2065 | kvm_unlink_unsync_page(kvm, sp); |
Avi Kivity | 4db3531 | 2007-11-21 15:28:32 +0200 | [diff] [blame] | 2066 | if (!sp->root_count) { |
Gui Jianfeng | 54a4f02 | 2010-05-05 09:03:49 +0800 | [diff] [blame] | 2067 | /* Count self */ |
| 2068 | ret++; |
Xiao Guangrong | 7775834 | 2010-06-04 21:53:54 +0800 | [diff] [blame] | 2069 | list_move(&sp->link, invalid_list); |
Xiao Guangrong | aa6bd18 | 2011-07-12 03:26:40 +0800 | [diff] [blame] | 2070 | kvm_mod_used_mmu_pages(kvm, -1); |
Marcelo Tosatti | 2e53d63 | 2008-02-20 14:47:24 -0500 | [diff] [blame] | 2071 | } else { |
Avi Kivity | 5b5c6a5 | 2008-07-11 18:07:26 +0300 | [diff] [blame] | 2072 | list_move(&sp->link, &kvm->arch.active_mmu_pages); |
Marcelo Tosatti | 2e53d63 | 2008-02-20 14:47:24 -0500 | [diff] [blame] | 2073 | kvm_reload_remote_mmus(kvm); |
| 2074 | } |
Xiao Guangrong | 7775834 | 2010-06-04 21:53:54 +0800 | [diff] [blame] | 2075 | |
| 2076 | sp->role.invalid = 1; |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 2077 | return ret; |
Avi Kivity | a436036 | 2007-01-05 16:36:45 -0800 | [diff] [blame] | 2078 | } |
| 2079 | |
Xiao Guangrong | 7775834 | 2010-06-04 21:53:54 +0800 | [diff] [blame] | 2080 | static void kvm_mmu_commit_zap_page(struct kvm *kvm, |
| 2081 | struct list_head *invalid_list) |
| 2082 | { |
| 2083 | struct kvm_mmu_page *sp; |
| 2084 | |
| 2085 | if (list_empty(invalid_list)) |
| 2086 | return; |
| 2087 | |
Avi Kivity | c142786 | 2012-05-14 15:44:06 +0300 | [diff] [blame] | 2088 | /* |
| 2089 | * wmb: make sure everyone sees our modifications to the page tables |
| 2090 | * rmb: make sure we see changes to vcpu->mode |
| 2091 | */ |
| 2092 | smp_mb(); |
| 2093 | |
| 2094 | /* |
| 2095 | * Wait for all vcpus to exit guest mode and/or lockless shadow |
| 2096 | * page table walks. |
| 2097 | */ |
Xiao Guangrong | 7775834 | 2010-06-04 21:53:54 +0800 | [diff] [blame] | 2098 | kvm_flush_remote_tlbs(kvm); |
| 2099 | |
| 2100 | do { |
| 2101 | sp = list_first_entry(invalid_list, struct kvm_mmu_page, link); |
| 2102 | WARN_ON(!sp->role.invalid || sp->root_count); |
Xiao Guangrong | aa6bd18 | 2011-07-12 03:26:40 +0800 | [diff] [blame] | 2103 | kvm_mmu_free_page(sp); |
Xiao Guangrong | 7775834 | 2010-06-04 21:53:54 +0800 | [diff] [blame] | 2104 | } while (!list_empty(invalid_list)); |
Xiao Guangrong | 7775834 | 2010-06-04 21:53:54 +0800 | [diff] [blame] | 2105 | } |
| 2106 | |
Izik Eidus | 82ce2c9 | 2007-10-02 18:52:55 +0200 | [diff] [blame] | 2107 | /* |
| 2108 | * Changing the number of mmu pages allocated to the vm |
Dave Hansen | 49d5ca2 | 2010-08-19 18:11:28 -0700 | [diff] [blame] | 2109 | * 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] | 2110 | */ |
Dave Hansen | 49d5ca2 | 2010-08-19 18:11:28 -0700 | [diff] [blame] | 2111 | 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] | 2112 | { |
Xiao Guangrong | d98ba05 | 2010-06-04 21:55:29 +0800 | [diff] [blame] | 2113 | LIST_HEAD(invalid_list); |
Izik Eidus | 82ce2c9 | 2007-10-02 18:52:55 +0200 | [diff] [blame] | 2114 | /* |
| 2115 | * If we set the number of mmu pages to be smaller be than the |
| 2116 | * number of actived pages , we must to free some mmu pages before we |
| 2117 | * change the value |
| 2118 | */ |
| 2119 | |
Takuya Yoshikawa | b34cb59 | 2013-01-08 19:46:07 +0900 | [diff] [blame] | 2120 | spin_lock(&kvm->mmu_lock); |
| 2121 | |
Dave Hansen | 49d5ca2 | 2010-08-19 18:11:28 -0700 | [diff] [blame] | 2122 | if (kvm->arch.n_used_mmu_pages > goal_nr_mmu_pages) { |
| 2123 | while (kvm->arch.n_used_mmu_pages > goal_nr_mmu_pages && |
Xiao Guangrong | 77662e0 | 2010-04-16 16:34:42 +0800 | [diff] [blame] | 2124 | !list_empty(&kvm->arch.active_mmu_pages)) { |
Izik Eidus | 82ce2c9 | 2007-10-02 18:52:55 +0200 | [diff] [blame] | 2125 | struct kvm_mmu_page *page; |
| 2126 | |
Zhang Xiantao | f05e70a | 2007-12-14 10:01:48 +0800 | [diff] [blame] | 2127 | page = container_of(kvm->arch.active_mmu_pages.prev, |
Izik Eidus | 82ce2c9 | 2007-10-02 18:52:55 +0200 | [diff] [blame] | 2128 | struct kvm_mmu_page, link); |
Xiaotian Feng | 80b63fa | 2010-08-24 10:31:07 +0800 | [diff] [blame] | 2129 | kvm_mmu_prepare_zap_page(kvm, page, &invalid_list); |
Izik Eidus | 82ce2c9 | 2007-10-02 18:52:55 +0200 | [diff] [blame] | 2130 | } |
Xiao Guangrong | aa6bd18 | 2011-07-12 03:26:40 +0800 | [diff] [blame] | 2131 | kvm_mmu_commit_zap_page(kvm, &invalid_list); |
Dave Hansen | 49d5ca2 | 2010-08-19 18:11:28 -0700 | [diff] [blame] | 2132 | goal_nr_mmu_pages = kvm->arch.n_used_mmu_pages; |
Izik Eidus | 82ce2c9 | 2007-10-02 18:52:55 +0200 | [diff] [blame] | 2133 | } |
Izik Eidus | 82ce2c9 | 2007-10-02 18:52:55 +0200 | [diff] [blame] | 2134 | |
Dave Hansen | 49d5ca2 | 2010-08-19 18:11:28 -0700 | [diff] [blame] | 2135 | kvm->arch.n_max_mmu_pages = goal_nr_mmu_pages; |
Takuya Yoshikawa | b34cb59 | 2013-01-08 19:46:07 +0900 | [diff] [blame] | 2136 | |
| 2137 | spin_unlock(&kvm->mmu_lock); |
Izik Eidus | 82ce2c9 | 2007-10-02 18:52:55 +0200 | [diff] [blame] | 2138 | } |
| 2139 | |
Xiao Guangrong | 1cb3f3a | 2011-09-22 17:02:48 +0800 | [diff] [blame] | 2140 | int kvm_mmu_unprotect_page(struct kvm *kvm, gfn_t gfn) |
Avi Kivity | a436036 | 2007-01-05 16:36:45 -0800 | [diff] [blame] | 2141 | { |
Avi Kivity | 4db3531 | 2007-11-21 15:28:32 +0200 | [diff] [blame] | 2142 | struct kvm_mmu_page *sp; |
Xiao Guangrong | f41d335 | 2010-06-04 21:56:11 +0800 | [diff] [blame] | 2143 | struct hlist_node *node; |
Xiao Guangrong | d98ba05 | 2010-06-04 21:55:29 +0800 | [diff] [blame] | 2144 | LIST_HEAD(invalid_list); |
Avi Kivity | a436036 | 2007-01-05 16:36:45 -0800 | [diff] [blame] | 2145 | int r; |
| 2146 | |
Xiao Guangrong | 9ad17b10 | 2010-08-28 19:19:42 +0800 | [diff] [blame] | 2147 | pgprintk("%s: looking for gfn %llx\n", __func__, gfn); |
Avi Kivity | a436036 | 2007-01-05 16:36:45 -0800 | [diff] [blame] | 2148 | r = 0; |
Xiao Guangrong | 1cb3f3a | 2011-09-22 17:02:48 +0800 | [diff] [blame] | 2149 | spin_lock(&kvm->mmu_lock); |
Xiao Guangrong | f41d335 | 2010-06-04 21:56:11 +0800 | [diff] [blame] | 2150 | for_each_gfn_indirect_valid_sp(kvm, sp, gfn, node) { |
Xiao Guangrong | 9ad17b10 | 2010-08-28 19:19:42 +0800 | [diff] [blame] | 2151 | pgprintk("%s: gfn %llx role %x\n", __func__, gfn, |
Xiao Guangrong | 7ae680e | 2010-06-04 21:53:07 +0800 | [diff] [blame] | 2152 | sp->role.word); |
| 2153 | r = 1; |
Xiao Guangrong | f41d335 | 2010-06-04 21:56:11 +0800 | [diff] [blame] | 2154 | kvm_mmu_prepare_zap_page(kvm, sp, &invalid_list); |
Xiao Guangrong | 7ae680e | 2010-06-04 21:53:07 +0800 | [diff] [blame] | 2155 | } |
Xiao Guangrong | d98ba05 | 2010-06-04 21:55:29 +0800 | [diff] [blame] | 2156 | kvm_mmu_commit_zap_page(kvm, &invalid_list); |
Xiao Guangrong | 1cb3f3a | 2011-09-22 17:02:48 +0800 | [diff] [blame] | 2157 | spin_unlock(&kvm->mmu_lock); |
| 2158 | |
Avi Kivity | a436036 | 2007-01-05 16:36:45 -0800 | [diff] [blame] | 2159 | return r; |
Avi Kivity | cea0f0e | 2007-01-05 16:36:43 -0800 | [diff] [blame] | 2160 | } |
Xiao Guangrong | 1cb3f3a | 2011-09-22 17:02:48 +0800 | [diff] [blame] | 2161 | EXPORT_SYMBOL_GPL(kvm_mmu_unprotect_page); |
Avi Kivity | cea0f0e | 2007-01-05 16:36:43 -0800 | [diff] [blame] | 2162 | |
Sheng Yang | 74be52e | 2008-10-09 16:01:56 +0800 | [diff] [blame] | 2163 | /* |
| 2164 | * The function is based on mtrr_type_lookup() in |
| 2165 | * arch/x86/kernel/cpu/mtrr/generic.c |
| 2166 | */ |
| 2167 | static int get_mtrr_type(struct mtrr_state_type *mtrr_state, |
| 2168 | u64 start, u64 end) |
| 2169 | { |
| 2170 | int i; |
| 2171 | u64 base, mask; |
| 2172 | u8 prev_match, curr_match; |
| 2173 | int num_var_ranges = KVM_NR_VAR_MTRR; |
| 2174 | |
| 2175 | if (!mtrr_state->enabled) |
| 2176 | return 0xFF; |
| 2177 | |
| 2178 | /* Make end inclusive end, instead of exclusive */ |
| 2179 | end--; |
| 2180 | |
| 2181 | /* Look in fixed ranges. Just return the type as per start */ |
| 2182 | if (mtrr_state->have_fixed && (start < 0x100000)) { |
| 2183 | int idx; |
| 2184 | |
| 2185 | if (start < 0x80000) { |
| 2186 | idx = 0; |
| 2187 | idx += (start >> 16); |
| 2188 | return mtrr_state->fixed_ranges[idx]; |
| 2189 | } else if (start < 0xC0000) { |
| 2190 | idx = 1 * 8; |
| 2191 | idx += ((start - 0x80000) >> 14); |
| 2192 | return mtrr_state->fixed_ranges[idx]; |
| 2193 | } else if (start < 0x1000000) { |
| 2194 | idx = 3 * 8; |
| 2195 | idx += ((start - 0xC0000) >> 12); |
| 2196 | return mtrr_state->fixed_ranges[idx]; |
| 2197 | } |
| 2198 | } |
| 2199 | |
| 2200 | /* |
| 2201 | * Look in variable ranges |
| 2202 | * Look of multiple ranges matching this address and pick type |
| 2203 | * as per MTRR precedence |
| 2204 | */ |
| 2205 | if (!(mtrr_state->enabled & 2)) |
| 2206 | return mtrr_state->def_type; |
| 2207 | |
| 2208 | prev_match = 0xFF; |
| 2209 | for (i = 0; i < num_var_ranges; ++i) { |
| 2210 | unsigned short start_state, end_state; |
| 2211 | |
| 2212 | if (!(mtrr_state->var_ranges[i].mask_lo & (1 << 11))) |
| 2213 | continue; |
| 2214 | |
| 2215 | base = (((u64)mtrr_state->var_ranges[i].base_hi) << 32) + |
| 2216 | (mtrr_state->var_ranges[i].base_lo & PAGE_MASK); |
| 2217 | mask = (((u64)mtrr_state->var_ranges[i].mask_hi) << 32) + |
| 2218 | (mtrr_state->var_ranges[i].mask_lo & PAGE_MASK); |
| 2219 | |
| 2220 | start_state = ((start & mask) == (base & mask)); |
| 2221 | end_state = ((end & mask) == (base & mask)); |
| 2222 | if (start_state != end_state) |
| 2223 | return 0xFE; |
| 2224 | |
| 2225 | if ((start & mask) != (base & mask)) |
| 2226 | continue; |
| 2227 | |
| 2228 | curr_match = mtrr_state->var_ranges[i].base_lo & 0xff; |
| 2229 | if (prev_match == 0xFF) { |
| 2230 | prev_match = curr_match; |
| 2231 | continue; |
| 2232 | } |
| 2233 | |
| 2234 | if (prev_match == MTRR_TYPE_UNCACHABLE || |
| 2235 | curr_match == MTRR_TYPE_UNCACHABLE) |
| 2236 | return MTRR_TYPE_UNCACHABLE; |
| 2237 | |
| 2238 | if ((prev_match == MTRR_TYPE_WRBACK && |
| 2239 | curr_match == MTRR_TYPE_WRTHROUGH) || |
| 2240 | (prev_match == MTRR_TYPE_WRTHROUGH && |
| 2241 | curr_match == MTRR_TYPE_WRBACK)) { |
| 2242 | prev_match = MTRR_TYPE_WRTHROUGH; |
| 2243 | curr_match = MTRR_TYPE_WRTHROUGH; |
| 2244 | } |
| 2245 | |
| 2246 | if (prev_match != curr_match) |
| 2247 | return MTRR_TYPE_UNCACHABLE; |
| 2248 | } |
| 2249 | |
| 2250 | if (prev_match != 0xFF) |
| 2251 | return prev_match; |
| 2252 | |
| 2253 | return mtrr_state->def_type; |
| 2254 | } |
| 2255 | |
Sheng Yang | 4b12f0d | 2009-04-27 20:35:42 +0800 | [diff] [blame] | 2256 | 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] | 2257 | { |
| 2258 | u8 mtrr; |
| 2259 | |
| 2260 | mtrr = get_mtrr_type(&vcpu->arch.mtrr_state, gfn << PAGE_SHIFT, |
| 2261 | (gfn << PAGE_SHIFT) + PAGE_SIZE); |
| 2262 | if (mtrr == 0xfe || mtrr == 0xff) |
| 2263 | mtrr = MTRR_TYPE_WRBACK; |
| 2264 | return mtrr; |
| 2265 | } |
Sheng Yang | 4b12f0d | 2009-04-27 20:35:42 +0800 | [diff] [blame] | 2266 | EXPORT_SYMBOL_GPL(kvm_get_guest_memory_type); |
Sheng Yang | 74be52e | 2008-10-09 16:01:56 +0800 | [diff] [blame] | 2267 | |
Xiao Guangrong | 9cf5cf5 | 2010-05-24 15:40:07 +0800 | [diff] [blame] | 2268 | 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] | 2269 | { |
Xiao Guangrong | 5e1b3dd | 2010-04-28 11:55:06 +0800 | [diff] [blame] | 2270 | trace_kvm_mmu_unsync_page(sp); |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 2271 | ++vcpu->kvm->stat.mmu_unsync; |
| 2272 | sp->unsync = 1; |
Marcelo Tosatti | 6cffe8c | 2008-12-01 22:32:04 -0200 | [diff] [blame] | 2273 | |
Xiao Guangrong | 6b18493 | 2010-04-16 21:29:17 +0800 | [diff] [blame] | 2274 | kvm_mmu_mark_parents_unsync(sp); |
Xiao Guangrong | 9cf5cf5 | 2010-05-24 15:40:07 +0800 | [diff] [blame] | 2275 | } |
| 2276 | |
| 2277 | static void kvm_unsync_pages(struct kvm_vcpu *vcpu, gfn_t gfn) |
| 2278 | { |
Xiao Guangrong | 9cf5cf5 | 2010-05-24 15:40:07 +0800 | [diff] [blame] | 2279 | struct kvm_mmu_page *s; |
Xiao Guangrong | f41d335 | 2010-06-04 21:56:11 +0800 | [diff] [blame] | 2280 | struct hlist_node *node; |
Xiao Guangrong | 9cf5cf5 | 2010-05-24 15:40:07 +0800 | [diff] [blame] | 2281 | |
Xiao Guangrong | f41d335 | 2010-06-04 21:56:11 +0800 | [diff] [blame] | 2282 | for_each_gfn_indirect_valid_sp(vcpu->kvm, s, gfn, node) { |
Xiao Guangrong | 7ae680e | 2010-06-04 21:53:07 +0800 | [diff] [blame] | 2283 | if (s->unsync) |
Xiao Guangrong | 9cf5cf5 | 2010-05-24 15:40:07 +0800 | [diff] [blame] | 2284 | continue; |
| 2285 | WARN_ON(s->role.level != PT_PAGE_TABLE_LEVEL); |
| 2286 | __kvm_unsync_page(vcpu, s); |
| 2287 | } |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 2288 | } |
| 2289 | |
| 2290 | static int mmu_need_write_protect(struct kvm_vcpu *vcpu, gfn_t gfn, |
| 2291 | bool can_unsync) |
| 2292 | { |
Xiao Guangrong | 9cf5cf5 | 2010-05-24 15:40:07 +0800 | [diff] [blame] | 2293 | struct kvm_mmu_page *s; |
Xiao Guangrong | f41d335 | 2010-06-04 21:56:11 +0800 | [diff] [blame] | 2294 | struct hlist_node *node; |
Xiao Guangrong | 9cf5cf5 | 2010-05-24 15:40:07 +0800 | [diff] [blame] | 2295 | bool need_unsync = false; |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 2296 | |
Xiao Guangrong | f41d335 | 2010-06-04 21:56:11 +0800 | [diff] [blame] | 2297 | for_each_gfn_indirect_valid_sp(vcpu->kvm, s, gfn, node) { |
Xiao Guangrong | 36a2e67 | 2010-06-30 16:02:02 +0800 | [diff] [blame] | 2298 | if (!can_unsync) |
| 2299 | return 1; |
| 2300 | |
Xiao Guangrong | 9cf5cf5 | 2010-05-24 15:40:07 +0800 | [diff] [blame] | 2301 | if (s->role.level != PT_PAGE_TABLE_LEVEL) |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 2302 | return 1; |
Xiao Guangrong | 9cf5cf5 | 2010-05-24 15:40:07 +0800 | [diff] [blame] | 2303 | |
Gleb Natapov | 9bb4f6b | 2013-01-30 16:45:01 +0200 | [diff] [blame] | 2304 | if (!s->unsync) |
Xiao Guangrong | 9cf5cf5 | 2010-05-24 15:40:07 +0800 | [diff] [blame] | 2305 | need_unsync = true; |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 2306 | } |
Xiao Guangrong | 9cf5cf5 | 2010-05-24 15:40:07 +0800 | [diff] [blame] | 2307 | if (need_unsync) |
| 2308 | kvm_unsync_pages(vcpu, gfn); |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 2309 | return 0; |
| 2310 | } |
| 2311 | |
Avi Kivity | d555c33 | 2009-06-10 14:24:23 +0300 | [diff] [blame] | 2312 | static int set_spte(struct kvm_vcpu *vcpu, u64 *sptep, |
Xiao Guangrong | c2288505 | 2013-01-08 14:36:04 +0800 | [diff] [blame] | 2313 | unsigned pte_access, int level, |
Marcelo Tosatti | c2d0ee4 | 2009-04-05 14:54:47 -0300 | [diff] [blame] | 2314 | gfn_t gfn, pfn_t pfn, bool speculative, |
Lai Jiangshan | 9bdbba1 | 2010-11-19 17:03:22 +0800 | [diff] [blame] | 2315 | bool can_unsync, bool host_writable) |
Avi Kivity | 1c4f1fd | 2007-12-09 17:40:31 +0200 | [diff] [blame] | 2316 | { |
Xiao Guangrong | 6e7d035 | 2012-06-20 15:58:33 +0800 | [diff] [blame] | 2317 | u64 spte; |
Marcelo Tosatti | 1e73f9d | 2008-09-23 13:18:30 -0300 | [diff] [blame] | 2318 | int ret = 0; |
Sheng Yang | 64d4d52 | 2008-10-09 16:01:57 +0800 | [diff] [blame] | 2319 | |
Xiao Guangrong | ce88dec | 2011-07-12 03:33:44 +0800 | [diff] [blame] | 2320 | if (set_mmio_spte(sptep, gfn, pfn, pte_access)) |
| 2321 | return 0; |
| 2322 | |
Marcelo Tosatti | 982c256 | 2010-10-22 14:18:16 -0200 | [diff] [blame] | 2323 | spte = PT_PRESENT_MASK; |
Avi Kivity | 947da53 | 2008-03-18 11:05:52 +0200 | [diff] [blame] | 2324 | if (!speculative) |
Avi Kivity | 3201b5d | 2008-08-27 20:01:04 +0300 | [diff] [blame] | 2325 | spte |= shadow_accessed_mask; |
Xiao Guangrong | 640d9b0 | 2011-07-12 03:24:39 +0800 | [diff] [blame] | 2326 | |
Sheng Yang | 7b52345 | 2008-04-25 21:13:50 +0800 | [diff] [blame] | 2327 | if (pte_access & ACC_EXEC_MASK) |
| 2328 | spte |= shadow_x_mask; |
| 2329 | else |
| 2330 | spte |= shadow_nx_mask; |
Xiao Guangrong | 49fde34 | 2012-06-20 15:58:58 +0800 | [diff] [blame] | 2331 | |
Avi Kivity | 1c4f1fd | 2007-12-09 17:40:31 +0200 | [diff] [blame] | 2332 | if (pte_access & ACC_USER_MASK) |
Sheng Yang | 7b52345 | 2008-04-25 21:13:50 +0800 | [diff] [blame] | 2333 | spte |= shadow_user_mask; |
Xiao Guangrong | 49fde34 | 2012-06-20 15:58:58 +0800 | [diff] [blame] | 2334 | |
Joerg Roedel | 852e3c1 | 2009-07-27 16:30:44 +0200 | [diff] [blame] | 2335 | if (level > PT_PAGE_TABLE_LEVEL) |
Marcelo Tosatti | 05da455 | 2008-02-23 11:44:30 -0300 | [diff] [blame] | 2336 | spte |= PT_PAGE_SIZE_MASK; |
Avi Kivity | b0bc3ee | 2010-09-13 16:45:28 +0200 | [diff] [blame] | 2337 | if (tdp_enabled) |
Sheng Yang | 4b12f0d | 2009-04-27 20:35:42 +0800 | [diff] [blame] | 2338 | spte |= kvm_x86_ops->get_mt_mask(vcpu, gfn, |
| 2339 | kvm_is_mmio_pfn(pfn)); |
Avi Kivity | 1c4f1fd | 2007-12-09 17:40:31 +0200 | [diff] [blame] | 2340 | |
Lai Jiangshan | 9bdbba1 | 2010-11-19 17:03:22 +0800 | [diff] [blame] | 2341 | if (host_writable) |
Izik Eidus | 1403283 | 2009-09-23 21:47:17 +0300 | [diff] [blame] | 2342 | spte |= SPTE_HOST_WRITEABLE; |
Xiao Guangrong | f8e453b | 2010-12-23 16:09:29 +0800 | [diff] [blame] | 2343 | else |
| 2344 | pte_access &= ~ACC_WRITE_MASK; |
Izik Eidus | 1403283 | 2009-09-23 21:47:17 +0300 | [diff] [blame] | 2345 | |
Anthony Liguori | 35149e2 | 2008-04-02 14:46:56 -0500 | [diff] [blame] | 2346 | spte |= (u64)pfn << PAGE_SHIFT; |
Avi Kivity | 1c4f1fd | 2007-12-09 17:40:31 +0200 | [diff] [blame] | 2347 | |
Xiao Guangrong | c2288505 | 2013-01-08 14:36:04 +0800 | [diff] [blame] | 2348 | if (pte_access & ACC_WRITE_MASK) { |
Avi Kivity | 1c4f1fd | 2007-12-09 17:40:31 +0200 | [diff] [blame] | 2349 | |
Xiao Guangrong | c219346 | 2012-12-04 07:17:11 +0800 | [diff] [blame] | 2350 | /* |
Xiao Guangrong | 7751bab | 2013-01-08 14:36:51 +0800 | [diff] [blame] | 2351 | * Other vcpu creates new sp in the window between |
| 2352 | * mapping_level() and acquiring mmu-lock. We can |
| 2353 | * allow guest to retry the access, the mapping can |
| 2354 | * be fixed if guest refault. |
Xiao Guangrong | c219346 | 2012-12-04 07:17:11 +0800 | [diff] [blame] | 2355 | */ |
Joerg Roedel | 852e3c1 | 2009-07-27 16:30:44 +0200 | [diff] [blame] | 2356 | if (level > PT_PAGE_TABLE_LEVEL && |
Xiao Guangrong | c219346 | 2012-12-04 07:17:11 +0800 | [diff] [blame] | 2357 | has_wrprotected_page(vcpu->kvm, gfn, level)) |
Avi Kivity | be38d27 | 2010-06-06 14:31:27 +0300 | [diff] [blame] | 2358 | goto done; |
Marcelo Tosatti | 38187c8 | 2008-09-23 13:18:32 -0300 | [diff] [blame] | 2359 | |
Xiao Guangrong | 49fde34 | 2012-06-20 15:58:58 +0800 | [diff] [blame] | 2360 | spte |= PT_WRITABLE_MASK | SPTE_MMU_WRITEABLE; |
Avi Kivity | 1c4f1fd | 2007-12-09 17:40:31 +0200 | [diff] [blame] | 2361 | |
Marcelo Tosatti | ecc5589 | 2008-11-25 15:58:07 +0100 | [diff] [blame] | 2362 | /* |
| 2363 | * Optimization: for pte sync, if spte was writable the hash |
| 2364 | * lookup is unnecessary (and expensive). Write protection |
| 2365 | * is responsibility of mmu_get_page / kvm_sync_page. |
| 2366 | * Same reasoning can be applied to dirty page accounting. |
| 2367 | */ |
Takuya Yoshikawa | 8dae444 | 2010-01-18 18:45:10 +0900 | [diff] [blame] | 2368 | if (!can_unsync && is_writable_pte(*sptep)) |
Marcelo Tosatti | ecc5589 | 2008-11-25 15:58:07 +0100 | [diff] [blame] | 2369 | goto set_pte; |
| 2370 | |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 2371 | if (mmu_need_write_protect(vcpu, gfn, can_unsync)) { |
Xiao Guangrong | 9ad17b10 | 2010-08-28 19:19:42 +0800 | [diff] [blame] | 2372 | pgprintk("%s: found shadow page for %llx, marking ro\n", |
Harvey Harrison | b8688d5 | 2008-03-03 12:59:56 -0800 | [diff] [blame] | 2373 | __func__, gfn); |
Marcelo Tosatti | 1e73f9d | 2008-09-23 13:18:30 -0300 | [diff] [blame] | 2374 | ret = 1; |
Avi Kivity | 1c4f1fd | 2007-12-09 17:40:31 +0200 | [diff] [blame] | 2375 | pte_access &= ~ACC_WRITE_MASK; |
Xiao Guangrong | 49fde34 | 2012-06-20 15:58:58 +0800 | [diff] [blame] | 2376 | spte &= ~(PT_WRITABLE_MASK | SPTE_MMU_WRITEABLE); |
Avi Kivity | 1c4f1fd | 2007-12-09 17:40:31 +0200 | [diff] [blame] | 2377 | } |
| 2378 | } |
| 2379 | |
Avi Kivity | 1c4f1fd | 2007-12-09 17:40:31 +0200 | [diff] [blame] | 2380 | if (pte_access & ACC_WRITE_MASK) |
| 2381 | mark_page_dirty(vcpu->kvm, gfn); |
| 2382 | |
Marcelo Tosatti | 38187c8 | 2008-09-23 13:18:32 -0300 | [diff] [blame] | 2383 | set_pte: |
Xiao Guangrong | 6e7d035 | 2012-06-20 15:58:33 +0800 | [diff] [blame] | 2384 | if (mmu_spte_update(sptep, spte)) |
Xiao Guangrong | b330aa0 | 2010-11-19 17:02:35 +0800 | [diff] [blame] | 2385 | kvm_flush_remote_tlbs(vcpu->kvm); |
Avi Kivity | be38d27 | 2010-06-06 14:31:27 +0300 | [diff] [blame] | 2386 | done: |
Marcelo Tosatti | 1e73f9d | 2008-09-23 13:18:30 -0300 | [diff] [blame] | 2387 | return ret; |
| 2388 | } |
| 2389 | |
Avi Kivity | d555c33 | 2009-06-10 14:24:23 +0300 | [diff] [blame] | 2390 | static void mmu_set_spte(struct kvm_vcpu *vcpu, u64 *sptep, |
Marcelo Tosatti | 1e73f9d | 2008-09-23 13:18:30 -0300 | [diff] [blame] | 2391 | unsigned pt_access, unsigned pte_access, |
Xiao Guangrong | c2288505 | 2013-01-08 14:36:04 +0800 | [diff] [blame] | 2392 | int write_fault, int *emulate, int level, gfn_t gfn, |
| 2393 | pfn_t pfn, bool speculative, bool host_writable) |
Marcelo Tosatti | 1e73f9d | 2008-09-23 13:18:30 -0300 | [diff] [blame] | 2394 | { |
| 2395 | int was_rmapped = 0; |
Marcelo Tosatti | 53a27b3 | 2009-08-05 15:43:58 -0300 | [diff] [blame] | 2396 | int rmap_count; |
Marcelo Tosatti | 1e73f9d | 2008-09-23 13:18:30 -0300 | [diff] [blame] | 2397 | |
Xiao Guangrong | c2288505 | 2013-01-08 14:36:04 +0800 | [diff] [blame] | 2398 | pgprintk("%s: spte %llx access %x write_fault %d gfn %llx\n", |
Avi Kivity | d555c33 | 2009-06-10 14:24:23 +0300 | [diff] [blame] | 2399 | __func__, *sptep, pt_access, |
Xiao Guangrong | c2288505 | 2013-01-08 14:36:04 +0800 | [diff] [blame] | 2400 | write_fault, gfn); |
Marcelo Tosatti | 1e73f9d | 2008-09-23 13:18:30 -0300 | [diff] [blame] | 2401 | |
Avi Kivity | d555c33 | 2009-06-10 14:24:23 +0300 | [diff] [blame] | 2402 | if (is_rmap_spte(*sptep)) { |
Marcelo Tosatti | 1e73f9d | 2008-09-23 13:18:30 -0300 | [diff] [blame] | 2403 | /* |
| 2404 | * If we overwrite a PTE page pointer with a 2MB PMD, unlink |
| 2405 | * the parent of the now unreachable PTE. |
| 2406 | */ |
Joerg Roedel | 852e3c1 | 2009-07-27 16:30:44 +0200 | [diff] [blame] | 2407 | if (level > PT_PAGE_TABLE_LEVEL && |
| 2408 | !is_large_pte(*sptep)) { |
Marcelo Tosatti | 1e73f9d | 2008-09-23 13:18:30 -0300 | [diff] [blame] | 2409 | struct kvm_mmu_page *child; |
Avi Kivity | d555c33 | 2009-06-10 14:24:23 +0300 | [diff] [blame] | 2410 | u64 pte = *sptep; |
Marcelo Tosatti | 1e73f9d | 2008-09-23 13:18:30 -0300 | [diff] [blame] | 2411 | |
| 2412 | child = page_header(pte & PT64_BASE_ADDR_MASK); |
Xiao Guangrong | bcdd9a9 | 2011-05-15 23:28:29 +0800 | [diff] [blame] | 2413 | drop_parent_pte(child, sptep); |
Marcelo Tosatti | 3be2264 | 2010-05-28 09:44:59 -0300 | [diff] [blame] | 2414 | kvm_flush_remote_tlbs(vcpu->kvm); |
Avi Kivity | d555c33 | 2009-06-10 14:24:23 +0300 | [diff] [blame] | 2415 | } else if (pfn != spte_to_pfn(*sptep)) { |
Xiao Guangrong | 9ad17b10 | 2010-08-28 19:19:42 +0800 | [diff] [blame] | 2416 | pgprintk("hfn old %llx new %llx\n", |
Avi Kivity | d555c33 | 2009-06-10 14:24:23 +0300 | [diff] [blame] | 2417 | spte_to_pfn(*sptep), pfn); |
Xiao Guangrong | c370795 | 2011-07-12 03:28:04 +0800 | [diff] [blame] | 2418 | drop_spte(vcpu->kvm, sptep); |
Xiao Guangrong | 9154635 | 2010-06-30 16:04:06 +0800 | [diff] [blame] | 2419 | kvm_flush_remote_tlbs(vcpu->kvm); |
Joerg Roedel | 6bed6b9 | 2009-02-18 14:08:59 +0100 | [diff] [blame] | 2420 | } else |
| 2421 | was_rmapped = 1; |
Marcelo Tosatti | 1e73f9d | 2008-09-23 13:18:30 -0300 | [diff] [blame] | 2422 | } |
Joerg Roedel | 852e3c1 | 2009-07-27 16:30:44 +0200 | [diff] [blame] | 2423 | |
Xiao Guangrong | c2288505 | 2013-01-08 14:36:04 +0800 | [diff] [blame] | 2424 | if (set_spte(vcpu, sptep, pte_access, level, gfn, pfn, speculative, |
| 2425 | true, host_writable)) { |
Marcelo Tosatti | 1e73f9d | 2008-09-23 13:18:30 -0300 | [diff] [blame] | 2426 | if (write_fault) |
Xiao Guangrong | b90a0e6 | 2011-07-12 03:25:56 +0800 | [diff] [blame] | 2427 | *emulate = 1; |
Xiao Guangrong | 5304efd | 2010-06-08 20:05:57 +0800 | [diff] [blame] | 2428 | kvm_mmu_flush_tlb(vcpu); |
Marcelo Tosatti | a378b4e | 2008-09-23 13:18:31 -0300 | [diff] [blame] | 2429 | } |
Marcelo Tosatti | 1e73f9d | 2008-09-23 13:18:30 -0300 | [diff] [blame] | 2430 | |
Xiao Guangrong | ce88dec | 2011-07-12 03:33:44 +0800 | [diff] [blame] | 2431 | if (unlikely(is_mmio_spte(*sptep) && emulate)) |
| 2432 | *emulate = 1; |
| 2433 | |
Avi Kivity | d555c33 | 2009-06-10 14:24:23 +0300 | [diff] [blame] | 2434 | pgprintk("%s: setting spte %llx\n", __func__, *sptep); |
Xiao Guangrong | 9ad17b10 | 2010-08-28 19:19:42 +0800 | [diff] [blame] | 2435 | pgprintk("instantiating %s PTE (%s) at %llx (%llx) addr %p\n", |
Avi Kivity | d555c33 | 2009-06-10 14:24:23 +0300 | [diff] [blame] | 2436 | is_large_pte(*sptep)? "2MB" : "4kB", |
Joerg Roedel | a205bc1 | 2009-07-09 16:36:01 +0200 | [diff] [blame] | 2437 | *sptep & PT_PRESENT_MASK ?"RW":"R", gfn, |
| 2438 | *sptep, sptep); |
Avi Kivity | d555c33 | 2009-06-10 14:24:23 +0300 | [diff] [blame] | 2439 | if (!was_rmapped && is_large_pte(*sptep)) |
Marcelo Tosatti | 05da455 | 2008-02-23 11:44:30 -0300 | [diff] [blame] | 2440 | ++vcpu->kvm->stat.lpages; |
| 2441 | |
Xiao Guangrong | ffb61bb | 2011-07-12 03:22:01 +0800 | [diff] [blame] | 2442 | if (is_shadow_present_pte(*sptep)) { |
Xiao Guangrong | ffb61bb | 2011-07-12 03:22:01 +0800 | [diff] [blame] | 2443 | if (!was_rmapped) { |
| 2444 | rmap_count = rmap_add(vcpu, sptep, gfn); |
| 2445 | if (rmap_count > RMAP_RECYCLE_THRESHOLD) |
| 2446 | rmap_recycle(vcpu, sptep, gfn); |
| 2447 | } |
Avi Kivity | 1c4f1fd | 2007-12-09 17:40:31 +0200 | [diff] [blame] | 2448 | } |
Xiao Guangrong | cb9aaa3 | 2012-08-03 15:42:10 +0800 | [diff] [blame] | 2449 | |
Xiao Guangrong | f3ac1a4 | 2012-10-16 20:07:03 +0800 | [diff] [blame] | 2450 | kvm_release_pfn_clean(pfn); |
Avi Kivity | 1c4f1fd | 2007-12-09 17:40:31 +0200 | [diff] [blame] | 2451 | } |
| 2452 | |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 2453 | static void nonpaging_new_cr3(struct kvm_vcpu *vcpu) |
| 2454 | { |
Avi Kivity | e676505 | 2012-07-08 17:16:30 +0300 | [diff] [blame] | 2455 | mmu_free_roots(vcpu); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 2456 | } |
| 2457 | |
Xiao Guangrong | a052b42 | 2012-10-16 20:09:36 +0800 | [diff] [blame] | 2458 | static bool is_rsvd_bits_set(struct kvm_mmu *mmu, u64 gpte, int level) |
| 2459 | { |
| 2460 | int bit7; |
| 2461 | |
| 2462 | bit7 = (gpte >> 7) & 1; |
| 2463 | return (gpte & mmu->rsvd_bits_mask[bit7][level-1]) != 0; |
| 2464 | } |
| 2465 | |
Xiao Guangrong | 957ed9e | 2010-08-22 19:12:48 +0800 | [diff] [blame] | 2466 | static pfn_t pte_prefetch_gfn_to_pfn(struct kvm_vcpu *vcpu, gfn_t gfn, |
| 2467 | bool no_dirty_log) |
| 2468 | { |
| 2469 | struct kvm_memory_slot *slot; |
Xiao Guangrong | 957ed9e | 2010-08-22 19:12:48 +0800 | [diff] [blame] | 2470 | |
Xiao Guangrong | 5d163b1 | 2011-03-09 15:43:00 +0800 | [diff] [blame] | 2471 | slot = gfn_to_memslot_dirty_bitmap(vcpu, gfn, no_dirty_log); |
Xiao Guangrong | 903816f | 2012-07-17 21:54:11 +0800 | [diff] [blame] | 2472 | if (!slot) |
Xiao Guangrong | 6c8ee57 | 2012-08-03 15:37:54 +0800 | [diff] [blame] | 2473 | return KVM_PFN_ERR_FAULT; |
Xiao Guangrong | 957ed9e | 2010-08-22 19:12:48 +0800 | [diff] [blame] | 2474 | |
Xiao Guangrong | 037d92d | 2012-08-21 10:59:12 +0800 | [diff] [blame] | 2475 | return gfn_to_pfn_memslot_atomic(slot, gfn); |
Xiao Guangrong | 957ed9e | 2010-08-22 19:12:48 +0800 | [diff] [blame] | 2476 | } |
| 2477 | |
Xiao Guangrong | a052b42 | 2012-10-16 20:09:36 +0800 | [diff] [blame] | 2478 | static bool prefetch_invalid_gpte(struct kvm_vcpu *vcpu, |
| 2479 | struct kvm_mmu_page *sp, u64 *spte, |
| 2480 | u64 gpte) |
| 2481 | { |
| 2482 | if (is_rsvd_bits_set(&vcpu->arch.mmu, gpte, PT_PAGE_TABLE_LEVEL)) |
| 2483 | goto no_present; |
| 2484 | |
| 2485 | if (!is_present_gpte(gpte)) |
| 2486 | goto no_present; |
| 2487 | |
| 2488 | if (!(gpte & PT_ACCESSED_MASK)) |
| 2489 | goto no_present; |
| 2490 | |
| 2491 | return false; |
| 2492 | |
| 2493 | no_present: |
| 2494 | drop_spte(vcpu->kvm, spte); |
| 2495 | return true; |
| 2496 | } |
| 2497 | |
Xiao Guangrong | 957ed9e | 2010-08-22 19:12:48 +0800 | [diff] [blame] | 2498 | static int direct_pte_prefetch_many(struct kvm_vcpu *vcpu, |
| 2499 | struct kvm_mmu_page *sp, |
| 2500 | u64 *start, u64 *end) |
| 2501 | { |
| 2502 | struct page *pages[PTE_PREFETCH_NUM]; |
| 2503 | unsigned access = sp->role.access; |
| 2504 | int i, ret; |
| 2505 | gfn_t gfn; |
| 2506 | |
| 2507 | gfn = kvm_mmu_page_get_gfn(sp, start - sp->spt); |
Xiao Guangrong | 5d163b1 | 2011-03-09 15:43:00 +0800 | [diff] [blame] | 2508 | if (!gfn_to_memslot_dirty_bitmap(vcpu, gfn, access & ACC_WRITE_MASK)) |
Xiao Guangrong | 957ed9e | 2010-08-22 19:12:48 +0800 | [diff] [blame] | 2509 | return -1; |
| 2510 | |
| 2511 | ret = gfn_to_page_many_atomic(vcpu->kvm, gfn, pages, end - start); |
| 2512 | if (ret <= 0) |
| 2513 | return -1; |
| 2514 | |
| 2515 | for (i = 0; i < ret; i++, gfn++, start++) |
Xiao Guangrong | c2288505 | 2013-01-08 14:36:04 +0800 | [diff] [blame] | 2516 | mmu_set_spte(vcpu, start, ACC_ALL, access, 0, NULL, |
| 2517 | sp->role.level, gfn, page_to_pfn(pages[i]), |
| 2518 | true, true); |
Xiao Guangrong | 957ed9e | 2010-08-22 19:12:48 +0800 | [diff] [blame] | 2519 | |
| 2520 | return 0; |
| 2521 | } |
| 2522 | |
| 2523 | static void __direct_pte_prefetch(struct kvm_vcpu *vcpu, |
| 2524 | struct kvm_mmu_page *sp, u64 *sptep) |
| 2525 | { |
| 2526 | u64 *spte, *start = NULL; |
| 2527 | int i; |
| 2528 | |
| 2529 | WARN_ON(!sp->role.direct); |
| 2530 | |
| 2531 | i = (sptep - sp->spt) & ~(PTE_PREFETCH_NUM - 1); |
| 2532 | spte = sp->spt + i; |
| 2533 | |
| 2534 | for (i = 0; i < PTE_PREFETCH_NUM; i++, spte++) { |
Xiao Guangrong | c370795 | 2011-07-12 03:28:04 +0800 | [diff] [blame] | 2535 | if (is_shadow_present_pte(*spte) || spte == sptep) { |
Xiao Guangrong | 957ed9e | 2010-08-22 19:12:48 +0800 | [diff] [blame] | 2536 | if (!start) |
| 2537 | continue; |
| 2538 | if (direct_pte_prefetch_many(vcpu, sp, start, spte) < 0) |
| 2539 | break; |
| 2540 | start = NULL; |
| 2541 | } else if (!start) |
| 2542 | start = spte; |
| 2543 | } |
| 2544 | } |
| 2545 | |
| 2546 | static void direct_pte_prefetch(struct kvm_vcpu *vcpu, u64 *sptep) |
| 2547 | { |
| 2548 | struct kvm_mmu_page *sp; |
| 2549 | |
| 2550 | /* |
| 2551 | * Since it's no accessed bit on EPT, it's no way to |
| 2552 | * distinguish between actually accessed translations |
| 2553 | * and prefetched, so disable pte prefetch if EPT is |
| 2554 | * enabled. |
| 2555 | */ |
| 2556 | if (!shadow_accessed_mask) |
| 2557 | return; |
| 2558 | |
| 2559 | sp = page_header(__pa(sptep)); |
| 2560 | if (sp->role.level > PT_PAGE_TABLE_LEVEL) |
| 2561 | return; |
| 2562 | |
| 2563 | __direct_pte_prefetch(vcpu, sp, sptep); |
| 2564 | } |
| 2565 | |
Joerg Roedel | 4d9976b | 2008-02-07 13:47:42 +0100 | [diff] [blame] | 2566 | 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] | 2567 | int map_writable, int level, gfn_t gfn, pfn_t pfn, |
| 2568 | bool prefault) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 2569 | { |
Avi Kivity | 9f652d2 | 2008-12-25 14:54:25 +0200 | [diff] [blame] | 2570 | struct kvm_shadow_walk_iterator iterator; |
| 2571 | struct kvm_mmu_page *sp; |
Xiao Guangrong | b90a0e6 | 2011-07-12 03:25:56 +0800 | [diff] [blame] | 2572 | int emulate = 0; |
Avi Kivity | 9f652d2 | 2008-12-25 14:54:25 +0200 | [diff] [blame] | 2573 | gfn_t pseudo_gfn; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 2574 | |
Avi Kivity | 9f652d2 | 2008-12-25 14:54:25 +0200 | [diff] [blame] | 2575 | for_each_shadow_entry(vcpu, (u64)gfn << PAGE_SHIFT, iterator) { |
Joerg Roedel | 852e3c1 | 2009-07-27 16:30:44 +0200 | [diff] [blame] | 2576 | if (iterator.level == level) { |
Marcelo Tosatti | 612819c | 2010-10-22 14:18:18 -0200 | [diff] [blame] | 2577 | unsigned pte_access = ACC_ALL; |
| 2578 | |
Marcelo Tosatti | 612819c | 2010-10-22 14:18:18 -0200 | [diff] [blame] | 2579 | mmu_set_spte(vcpu, iterator.sptep, ACC_ALL, pte_access, |
Xiao Guangrong | c2288505 | 2013-01-08 14:36:04 +0800 | [diff] [blame] | 2580 | write, &emulate, level, gfn, pfn, |
| 2581 | prefault, map_writable); |
Xiao Guangrong | 957ed9e | 2010-08-22 19:12:48 +0800 | [diff] [blame] | 2582 | direct_pte_prefetch(vcpu, iterator.sptep); |
Avi Kivity | 9f652d2 | 2008-12-25 14:54:25 +0200 | [diff] [blame] | 2583 | ++vcpu->stat.pf_fixed; |
| 2584 | break; |
| 2585 | } |
| 2586 | |
Xiao Guangrong | caf6900 | 2013-02-05 15:11:09 +0800 | [diff] [blame] | 2587 | drop_large_spte(vcpu, iterator.sptep); |
| 2588 | |
Xiao Guangrong | c370795 | 2011-07-12 03:28:04 +0800 | [diff] [blame] | 2589 | if (!is_shadow_present_pte(*iterator.sptep)) { |
Lai Jiangshan | c9fa0b3 | 2010-05-26 16:48:25 +0800 | [diff] [blame] | 2590 | u64 base_addr = iterator.addr; |
| 2591 | |
| 2592 | base_addr &= PT64_LVL_ADDR_MASK(iterator.level); |
| 2593 | pseudo_gfn = base_addr >> PAGE_SHIFT; |
Avi Kivity | 9f652d2 | 2008-12-25 14:54:25 +0200 | [diff] [blame] | 2594 | sp = kvm_mmu_get_page(vcpu, pseudo_gfn, iterator.addr, |
| 2595 | iterator.level - 1, |
| 2596 | 1, ACC_ALL, iterator.sptep); |
Avi Kivity | 9f652d2 | 2008-12-25 14:54:25 +0200 | [diff] [blame] | 2597 | |
Xiao Guangrong | 1df9f2d | 2011-07-12 03:30:35 +0800 | [diff] [blame] | 2598 | mmu_spte_set(iterator.sptep, |
| 2599 | __pa(sp->spt) |
| 2600 | | PT_PRESENT_MASK | PT_WRITABLE_MASK |
| 2601 | | shadow_user_mask | shadow_x_mask |
| 2602 | | shadow_accessed_mask); |
Avi Kivity | 9f652d2 | 2008-12-25 14:54:25 +0200 | [diff] [blame] | 2603 | } |
| 2604 | } |
Xiao Guangrong | b90a0e6 | 2011-07-12 03:25:56 +0800 | [diff] [blame] | 2605 | return emulate; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 2606 | } |
| 2607 | |
Huang Ying | 77db5cb | 2010-10-08 16:24:15 +0800 | [diff] [blame] | 2608 | 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] | 2609 | { |
Huang Ying | 77db5cb | 2010-10-08 16:24:15 +0800 | [diff] [blame] | 2610 | siginfo_t info; |
Huang Ying | bf99815 | 2010-05-31 14:28:19 +0800 | [diff] [blame] | 2611 | |
Huang Ying | 77db5cb | 2010-10-08 16:24:15 +0800 | [diff] [blame] | 2612 | info.si_signo = SIGBUS; |
| 2613 | info.si_errno = 0; |
| 2614 | info.si_code = BUS_MCEERR_AR; |
| 2615 | info.si_addr = (void __user *)address; |
| 2616 | info.si_addr_lsb = PAGE_SHIFT; |
| 2617 | |
| 2618 | send_sig_info(SIGBUS, &info, tsk); |
Huang Ying | bf99815 | 2010-05-31 14:28:19 +0800 | [diff] [blame] | 2619 | } |
| 2620 | |
Xiao Guangrong | d7c5520 | 2011-07-12 03:29:38 +0800 | [diff] [blame] | 2621 | 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] | 2622 | { |
Xiao Guangrong | 4d8b81a | 2012-08-21 11:02:51 +0800 | [diff] [blame] | 2623 | /* |
| 2624 | * Do not cache the mmio info caused by writing the readonly gfn |
| 2625 | * into the spte otherwise read access on readonly gfn also can |
| 2626 | * caused mmio page fault and treat it as mmio access. |
| 2627 | * Return 1 to tell kvm to emulate it. |
| 2628 | */ |
| 2629 | if (pfn == KVM_PFN_ERR_RO_FAULT) |
| 2630 | return 1; |
| 2631 | |
Xiao Guangrong | e6c1502 | 2012-08-03 15:38:36 +0800 | [diff] [blame] | 2632 | if (pfn == KVM_PFN_ERR_HWPOISON) { |
Xiao Guangrong | bebb106 | 2011-07-12 03:23:20 +0800 | [diff] [blame] | 2633 | kvm_send_hwpoison_signal(gfn_to_hva(vcpu->kvm, gfn), current); |
Huang Ying | bf99815 | 2010-05-31 14:28:19 +0800 | [diff] [blame] | 2634 | return 0; |
Xiao Guangrong | d7c5520 | 2011-07-12 03:29:38 +0800 | [diff] [blame] | 2635 | } |
Gleb Natapov | edba23e | 2010-07-07 20:16:45 +0300 | [diff] [blame] | 2636 | |
Xiao Guangrong | d7c5520 | 2011-07-12 03:29:38 +0800 | [diff] [blame] | 2637 | return -EFAULT; |
Huang Ying | bf99815 | 2010-05-31 14:28:19 +0800 | [diff] [blame] | 2638 | } |
| 2639 | |
Andrea Arcangeli | 936a5fe | 2011-01-13 15:46:48 -0800 | [diff] [blame] | 2640 | static void transparent_hugepage_adjust(struct kvm_vcpu *vcpu, |
| 2641 | gfn_t *gfnp, pfn_t *pfnp, int *levelp) |
| 2642 | { |
| 2643 | pfn_t pfn = *pfnp; |
| 2644 | gfn_t gfn = *gfnp; |
| 2645 | int level = *levelp; |
| 2646 | |
| 2647 | /* |
| 2648 | * Check if it's a transparent hugepage. If this would be an |
| 2649 | * hugetlbfs page, level wouldn't be set to |
| 2650 | * PT_PAGE_TABLE_LEVEL and there would be no adjustment done |
| 2651 | * here. |
| 2652 | */ |
Xiao Guangrong | 81c52c5 | 2012-10-16 20:10:59 +0800 | [diff] [blame] | 2653 | if (!is_error_noslot_pfn(pfn) && !kvm_is_mmio_pfn(pfn) && |
Andrea Arcangeli | 936a5fe | 2011-01-13 15:46:48 -0800 | [diff] [blame] | 2654 | level == PT_PAGE_TABLE_LEVEL && |
| 2655 | PageTransCompound(pfn_to_page(pfn)) && |
| 2656 | !has_wrprotected_page(vcpu->kvm, gfn, PT_DIRECTORY_LEVEL)) { |
| 2657 | unsigned long mask; |
| 2658 | /* |
| 2659 | * mmu_notifier_retry was successful and we hold the |
| 2660 | * mmu_lock here, so the pmd can't become splitting |
| 2661 | * from under us, and in turn |
| 2662 | * __split_huge_page_refcount() can't run from under |
| 2663 | * us and we can safely transfer the refcount from |
| 2664 | * PG_tail to PG_head as we switch the pfn to tail to |
| 2665 | * head. |
| 2666 | */ |
| 2667 | *levelp = level = PT_DIRECTORY_LEVEL; |
| 2668 | mask = KVM_PAGES_PER_HPAGE(level) - 1; |
| 2669 | VM_BUG_ON((gfn & mask) != (pfn & mask)); |
| 2670 | if (pfn & mask) { |
| 2671 | gfn &= ~mask; |
| 2672 | *gfnp = gfn; |
| 2673 | kvm_release_pfn_clean(pfn); |
| 2674 | pfn &= ~mask; |
Xiao Guangrong | c358666 | 2012-05-28 14:10:43 +0800 | [diff] [blame] | 2675 | kvm_get_pfn(pfn); |
Andrea Arcangeli | 936a5fe | 2011-01-13 15:46:48 -0800 | [diff] [blame] | 2676 | *pfnp = pfn; |
| 2677 | } |
| 2678 | } |
| 2679 | } |
| 2680 | |
Xiao Guangrong | d7c5520 | 2011-07-12 03:29:38 +0800 | [diff] [blame] | 2681 | static bool handle_abnormal_pfn(struct kvm_vcpu *vcpu, gva_t gva, gfn_t gfn, |
| 2682 | pfn_t pfn, unsigned access, int *ret_val) |
| 2683 | { |
| 2684 | bool ret = true; |
| 2685 | |
| 2686 | /* The pfn is invalid, report the error! */ |
Xiao Guangrong | 81c52c5 | 2012-10-16 20:10:59 +0800 | [diff] [blame] | 2687 | if (unlikely(is_error_pfn(pfn))) { |
Xiao Guangrong | d7c5520 | 2011-07-12 03:29:38 +0800 | [diff] [blame] | 2688 | *ret_val = kvm_handle_bad_page(vcpu, gfn, pfn); |
| 2689 | goto exit; |
| 2690 | } |
| 2691 | |
Xiao Guangrong | ce88dec | 2011-07-12 03:33:44 +0800 | [diff] [blame] | 2692 | if (unlikely(is_noslot_pfn(pfn))) |
Xiao Guangrong | d7c5520 | 2011-07-12 03:29:38 +0800 | [diff] [blame] | 2693 | vcpu_cache_mmio_info(vcpu, gva, gfn, access); |
Xiao Guangrong | d7c5520 | 2011-07-12 03:29:38 +0800 | [diff] [blame] | 2694 | |
| 2695 | ret = false; |
| 2696 | exit: |
| 2697 | return ret; |
| 2698 | } |
| 2699 | |
Xiao Guangrong | c7ba5b4 | 2012-06-20 15:59:18 +0800 | [diff] [blame] | 2700 | static bool page_fault_can_be_fast(struct kvm_vcpu *vcpu, u32 error_code) |
| 2701 | { |
| 2702 | /* |
| 2703 | * #PF can be fast only if the shadow page table is present and it |
| 2704 | * is caused by write-protect, that means we just need change the |
| 2705 | * W bit of the spte which can be done out of mmu-lock. |
| 2706 | */ |
| 2707 | if (!(error_code & PFERR_PRESENT_MASK) || |
| 2708 | !(error_code & PFERR_WRITE_MASK)) |
| 2709 | return false; |
| 2710 | |
| 2711 | return true; |
| 2712 | } |
| 2713 | |
| 2714 | static bool |
| 2715 | fast_pf_fix_direct_spte(struct kvm_vcpu *vcpu, u64 *sptep, u64 spte) |
| 2716 | { |
| 2717 | struct kvm_mmu_page *sp = page_header(__pa(sptep)); |
| 2718 | gfn_t gfn; |
| 2719 | |
| 2720 | WARN_ON(!sp->role.direct); |
| 2721 | |
| 2722 | /* |
| 2723 | * The gfn of direct spte is stable since it is calculated |
| 2724 | * by sp->gfn. |
| 2725 | */ |
| 2726 | gfn = kvm_mmu_page_get_gfn(sp, sptep - sp->spt); |
| 2727 | |
| 2728 | if (cmpxchg64(sptep, spte, spte | PT_WRITABLE_MASK) == spte) |
| 2729 | mark_page_dirty(vcpu->kvm, gfn); |
| 2730 | |
| 2731 | return true; |
| 2732 | } |
| 2733 | |
| 2734 | /* |
| 2735 | * Return value: |
| 2736 | * - true: let the vcpu to access on the same address again. |
| 2737 | * - false: let the real page fault path to fix it. |
| 2738 | */ |
| 2739 | static bool fast_page_fault(struct kvm_vcpu *vcpu, gva_t gva, int level, |
| 2740 | u32 error_code) |
| 2741 | { |
| 2742 | struct kvm_shadow_walk_iterator iterator; |
| 2743 | bool ret = false; |
| 2744 | u64 spte = 0ull; |
| 2745 | |
| 2746 | if (!page_fault_can_be_fast(vcpu, error_code)) |
| 2747 | return false; |
| 2748 | |
| 2749 | walk_shadow_page_lockless_begin(vcpu); |
| 2750 | for_each_shadow_entry_lockless(vcpu, gva, iterator, spte) |
| 2751 | if (!is_shadow_present_pte(spte) || iterator.level < level) |
| 2752 | break; |
| 2753 | |
| 2754 | /* |
| 2755 | * If the mapping has been changed, let the vcpu fault on the |
| 2756 | * same address again. |
| 2757 | */ |
| 2758 | if (!is_rmap_spte(spte)) { |
| 2759 | ret = true; |
| 2760 | goto exit; |
| 2761 | } |
| 2762 | |
| 2763 | if (!is_last_spte(spte, level)) |
| 2764 | goto exit; |
| 2765 | |
| 2766 | /* |
| 2767 | * Check if it is a spurious fault caused by TLB lazily flushed. |
| 2768 | * |
| 2769 | * Need not check the access of upper level table entries since |
| 2770 | * they are always ACC_ALL. |
| 2771 | */ |
| 2772 | if (is_writable_pte(spte)) { |
| 2773 | ret = true; |
| 2774 | goto exit; |
| 2775 | } |
| 2776 | |
| 2777 | /* |
| 2778 | * Currently, to simplify the code, only the spte write-protected |
| 2779 | * by dirty-log can be fast fixed. |
| 2780 | */ |
| 2781 | if (!spte_is_locklessly_modifiable(spte)) |
| 2782 | goto exit; |
| 2783 | |
| 2784 | /* |
| 2785 | * Currently, fast page fault only works for direct mapping since |
| 2786 | * the gfn is not stable for indirect shadow page. |
| 2787 | * See Documentation/virtual/kvm/locking.txt to get more detail. |
| 2788 | */ |
| 2789 | ret = fast_pf_fix_direct_spte(vcpu, iterator.sptep, spte); |
| 2790 | exit: |
Xiao Guangrong | a72faf2 | 2012-06-20 15:59:41 +0800 | [diff] [blame] | 2791 | trace_fast_page_fault(vcpu, gva, error_code, iterator.sptep, |
| 2792 | spte, ret); |
Xiao Guangrong | c7ba5b4 | 2012-06-20 15:59:18 +0800 | [diff] [blame] | 2793 | walk_shadow_page_lockless_end(vcpu); |
| 2794 | |
| 2795 | return ret; |
| 2796 | } |
| 2797 | |
Xiao Guangrong | 78b2c54 | 2010-12-07 10:48:06 +0800 | [diff] [blame] | 2798 | 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] | 2799 | gva_t gva, pfn_t *pfn, bool write, bool *writable); |
| 2800 | |
Xiao Guangrong | c7ba5b4 | 2012-06-20 15:59:18 +0800 | [diff] [blame] | 2801 | static int nonpaging_map(struct kvm_vcpu *vcpu, gva_t v, u32 error_code, |
| 2802 | gfn_t gfn, bool prefault) |
Marcelo Tosatti | 10589a4 | 2007-12-20 19:18:22 -0500 | [diff] [blame] | 2803 | { |
| 2804 | int r; |
Joerg Roedel | 852e3c1 | 2009-07-27 16:30:44 +0200 | [diff] [blame] | 2805 | int level; |
Andrea Arcangeli | 936a5fe | 2011-01-13 15:46:48 -0800 | [diff] [blame] | 2806 | int force_pt_level; |
Anthony Liguori | 35149e2 | 2008-04-02 14:46:56 -0500 | [diff] [blame] | 2807 | pfn_t pfn; |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 2808 | unsigned long mmu_seq; |
Xiao Guangrong | c7ba5b4 | 2012-06-20 15:59:18 +0800 | [diff] [blame] | 2809 | bool map_writable, write = error_code & PFERR_WRITE_MASK; |
Marcelo Tosatti | aaee2c9 | 2007-12-20 19:18:26 -0500 | [diff] [blame] | 2810 | |
Andrea Arcangeli | 936a5fe | 2011-01-13 15:46:48 -0800 | [diff] [blame] | 2811 | force_pt_level = mapping_level_dirty_bitmap(vcpu, gfn); |
| 2812 | if (likely(!force_pt_level)) { |
| 2813 | level = mapping_level(vcpu, gfn); |
| 2814 | /* |
| 2815 | * This path builds a PAE pagetable - so we can map |
| 2816 | * 2mb pages at maximum. Therefore check if the level |
| 2817 | * is larger than that. |
| 2818 | */ |
| 2819 | if (level > PT_DIRECTORY_LEVEL) |
| 2820 | level = PT_DIRECTORY_LEVEL; |
Joerg Roedel | 852e3c1 | 2009-07-27 16:30:44 +0200 | [diff] [blame] | 2821 | |
Andrea Arcangeli | 936a5fe | 2011-01-13 15:46:48 -0800 | [diff] [blame] | 2822 | gfn &= ~(KVM_PAGES_PER_HPAGE(level) - 1); |
| 2823 | } else |
| 2824 | level = PT_PAGE_TABLE_LEVEL; |
Marcelo Tosatti | 05da455 | 2008-02-23 11:44:30 -0300 | [diff] [blame] | 2825 | |
Xiao Guangrong | c7ba5b4 | 2012-06-20 15:59:18 +0800 | [diff] [blame] | 2826 | if (fast_page_fault(vcpu, v, level, error_code)) |
| 2827 | return 0; |
| 2828 | |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 2829 | mmu_seq = vcpu->kvm->mmu_notifier_seq; |
Marcelo Tosatti | 4c2155c | 2008-09-16 20:54:47 -0300 | [diff] [blame] | 2830 | smp_rmb(); |
Xiao Guangrong | 060c2ab | 2010-11-12 14:49:11 +0800 | [diff] [blame] | 2831 | |
Xiao Guangrong | 78b2c54 | 2010-12-07 10:48:06 +0800 | [diff] [blame] | 2832 | if (try_async_pf(vcpu, prefault, gfn, v, &pfn, write, &map_writable)) |
Xiao Guangrong | 060c2ab | 2010-11-12 14:49:11 +0800 | [diff] [blame] | 2833 | return 0; |
Marcelo Tosatti | aaee2c9 | 2007-12-20 19:18:26 -0500 | [diff] [blame] | 2834 | |
Xiao Guangrong | d7c5520 | 2011-07-12 03:29:38 +0800 | [diff] [blame] | 2835 | if (handle_abnormal_pfn(vcpu, v, gfn, pfn, ACC_ALL, &r)) |
| 2836 | return r; |
Avi Kivity | d196e34 | 2008-01-24 11:44:11 +0200 | [diff] [blame] | 2837 | |
Marcelo Tosatti | aaee2c9 | 2007-12-20 19:18:26 -0500 | [diff] [blame] | 2838 | spin_lock(&vcpu->kvm->mmu_lock); |
Christoffer Dall | 8ca40a7 | 2012-10-14 23:10:18 -0400 | [diff] [blame] | 2839 | if (mmu_notifier_retry(vcpu->kvm, mmu_seq)) |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 2840 | goto out_unlock; |
Avi Kivity | eb787d1 | 2007-12-31 15:27:49 +0200 | [diff] [blame] | 2841 | kvm_mmu_free_some_pages(vcpu); |
Andrea Arcangeli | 936a5fe | 2011-01-13 15:46:48 -0800 | [diff] [blame] | 2842 | if (likely(!force_pt_level)) |
| 2843 | transparent_hugepage_adjust(vcpu, &gfn, &pfn, &level); |
Xiao Guangrong | 2ec4739 | 2010-12-07 10:34:42 +0800 | [diff] [blame] | 2844 | r = __direct_map(vcpu, v, write, map_writable, level, gfn, pfn, |
| 2845 | prefault); |
Marcelo Tosatti | aaee2c9 | 2007-12-20 19:18:26 -0500 | [diff] [blame] | 2846 | spin_unlock(&vcpu->kvm->mmu_lock); |
| 2847 | |
Marcelo Tosatti | aaee2c9 | 2007-12-20 19:18:26 -0500 | [diff] [blame] | 2848 | |
Marcelo Tosatti | 10589a4 | 2007-12-20 19:18:22 -0500 | [diff] [blame] | 2849 | return r; |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 2850 | |
| 2851 | out_unlock: |
| 2852 | spin_unlock(&vcpu->kvm->mmu_lock); |
| 2853 | kvm_release_pfn_clean(pfn); |
| 2854 | return 0; |
Marcelo Tosatti | 10589a4 | 2007-12-20 19:18:22 -0500 | [diff] [blame] | 2855 | } |
| 2856 | |
| 2857 | |
Avi Kivity | 17ac10a | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 2858 | static void mmu_free_roots(struct kvm_vcpu *vcpu) |
| 2859 | { |
| 2860 | int i; |
Avi Kivity | 4db3531 | 2007-11-21 15:28:32 +0200 | [diff] [blame] | 2861 | struct kvm_mmu_page *sp; |
Xiao Guangrong | d98ba05 | 2010-06-04 21:55:29 +0800 | [diff] [blame] | 2862 | LIST_HEAD(invalid_list); |
Avi Kivity | 17ac10a | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 2863 | |
Zhang Xiantao | ad312c7 | 2007-12-13 23:50:52 +0800 | [diff] [blame] | 2864 | if (!VALID_PAGE(vcpu->arch.mmu.root_hpa)) |
Avi Kivity | 7b53aa5 | 2007-06-05 12:17:03 +0300 | [diff] [blame] | 2865 | return; |
Marcelo Tosatti | aaee2c9 | 2007-12-20 19:18:26 -0500 | [diff] [blame] | 2866 | spin_lock(&vcpu->kvm->mmu_lock); |
Joerg Roedel | 81407ca | 2010-09-10 17:31:00 +0200 | [diff] [blame] | 2867 | if (vcpu->arch.mmu.shadow_root_level == PT64_ROOT_LEVEL && |
| 2868 | (vcpu->arch.mmu.root_level == PT64_ROOT_LEVEL || |
| 2869 | vcpu->arch.mmu.direct_map)) { |
Zhang Xiantao | ad312c7 | 2007-12-13 23:50:52 +0800 | [diff] [blame] | 2870 | hpa_t root = vcpu->arch.mmu.root_hpa; |
Avi Kivity | 17ac10a | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 2871 | |
Avi Kivity | 4db3531 | 2007-11-21 15:28:32 +0200 | [diff] [blame] | 2872 | sp = page_header(root); |
| 2873 | --sp->root_count; |
Xiao Guangrong | d98ba05 | 2010-06-04 21:55:29 +0800 | [diff] [blame] | 2874 | if (!sp->root_count && sp->role.invalid) { |
| 2875 | kvm_mmu_prepare_zap_page(vcpu->kvm, sp, &invalid_list); |
| 2876 | kvm_mmu_commit_zap_page(vcpu->kvm, &invalid_list); |
| 2877 | } |
Zhang Xiantao | ad312c7 | 2007-12-13 23:50:52 +0800 | [diff] [blame] | 2878 | vcpu->arch.mmu.root_hpa = INVALID_PAGE; |
Marcelo Tosatti | aaee2c9 | 2007-12-20 19:18:26 -0500 | [diff] [blame] | 2879 | spin_unlock(&vcpu->kvm->mmu_lock); |
Avi Kivity | 17ac10a | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 2880 | return; |
| 2881 | } |
Avi Kivity | 17ac10a | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 2882 | for (i = 0; i < 4; ++i) { |
Zhang Xiantao | ad312c7 | 2007-12-13 23:50:52 +0800 | [diff] [blame] | 2883 | hpa_t root = vcpu->arch.mmu.pae_root[i]; |
Avi Kivity | 17ac10a | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 2884 | |
Avi Kivity | 417726a | 2007-04-12 17:35:58 +0300 | [diff] [blame] | 2885 | if (root) { |
Avi Kivity | 417726a | 2007-04-12 17:35:58 +0300 | [diff] [blame] | 2886 | root &= PT64_BASE_ADDR_MASK; |
Avi Kivity | 4db3531 | 2007-11-21 15:28:32 +0200 | [diff] [blame] | 2887 | sp = page_header(root); |
| 2888 | --sp->root_count; |
Marcelo Tosatti | 2e53d63 | 2008-02-20 14:47:24 -0500 | [diff] [blame] | 2889 | if (!sp->root_count && sp->role.invalid) |
Xiao Guangrong | d98ba05 | 2010-06-04 21:55:29 +0800 | [diff] [blame] | 2890 | kvm_mmu_prepare_zap_page(vcpu->kvm, sp, |
| 2891 | &invalid_list); |
Avi Kivity | 417726a | 2007-04-12 17:35:58 +0300 | [diff] [blame] | 2892 | } |
Zhang Xiantao | ad312c7 | 2007-12-13 23:50:52 +0800 | [diff] [blame] | 2893 | vcpu->arch.mmu.pae_root[i] = INVALID_PAGE; |
Avi Kivity | 17ac10a | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 2894 | } |
Xiao Guangrong | d98ba05 | 2010-06-04 21:55:29 +0800 | [diff] [blame] | 2895 | kvm_mmu_commit_zap_page(vcpu->kvm, &invalid_list); |
Marcelo Tosatti | aaee2c9 | 2007-12-20 19:18:26 -0500 | [diff] [blame] | 2896 | spin_unlock(&vcpu->kvm->mmu_lock); |
Zhang Xiantao | ad312c7 | 2007-12-13 23:50:52 +0800 | [diff] [blame] | 2897 | vcpu->arch.mmu.root_hpa = INVALID_PAGE; |
Avi Kivity | 17ac10a | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 2898 | } |
| 2899 | |
Marcelo Tosatti | 8986ecc | 2009-05-12 18:55:45 -0300 | [diff] [blame] | 2900 | static int mmu_check_root(struct kvm_vcpu *vcpu, gfn_t root_gfn) |
| 2901 | { |
| 2902 | int ret = 0; |
| 2903 | |
| 2904 | if (!kvm_is_visible_gfn(vcpu->kvm, root_gfn)) { |
Avi Kivity | a8eeb04 | 2010-05-10 12:34:53 +0300 | [diff] [blame] | 2905 | kvm_make_request(KVM_REQ_TRIPLE_FAULT, vcpu); |
Marcelo Tosatti | 8986ecc | 2009-05-12 18:55:45 -0300 | [diff] [blame] | 2906 | ret = 1; |
| 2907 | } |
| 2908 | |
| 2909 | return ret; |
| 2910 | } |
| 2911 | |
Joerg Roedel | 651dd37 | 2010-09-10 17:30:59 +0200 | [diff] [blame] | 2912 | static int mmu_alloc_direct_roots(struct kvm_vcpu *vcpu) |
| 2913 | { |
| 2914 | struct kvm_mmu_page *sp; |
Avi Kivity | 7ebaf15 | 2010-10-03 18:51:39 +0200 | [diff] [blame] | 2915 | unsigned i; |
Joerg Roedel | 651dd37 | 2010-09-10 17:30:59 +0200 | [diff] [blame] | 2916 | |
| 2917 | if (vcpu->arch.mmu.shadow_root_level == PT64_ROOT_LEVEL) { |
| 2918 | spin_lock(&vcpu->kvm->mmu_lock); |
| 2919 | kvm_mmu_free_some_pages(vcpu); |
| 2920 | sp = kvm_mmu_get_page(vcpu, 0, 0, PT64_ROOT_LEVEL, |
| 2921 | 1, ACC_ALL, NULL); |
| 2922 | ++sp->root_count; |
| 2923 | spin_unlock(&vcpu->kvm->mmu_lock); |
| 2924 | vcpu->arch.mmu.root_hpa = __pa(sp->spt); |
| 2925 | } else if (vcpu->arch.mmu.shadow_root_level == PT32E_ROOT_LEVEL) { |
| 2926 | for (i = 0; i < 4; ++i) { |
| 2927 | hpa_t root = vcpu->arch.mmu.pae_root[i]; |
| 2928 | |
| 2929 | ASSERT(!VALID_PAGE(root)); |
| 2930 | spin_lock(&vcpu->kvm->mmu_lock); |
| 2931 | kvm_mmu_free_some_pages(vcpu); |
Avi Kivity | 649497d | 2010-12-28 12:09:07 +0200 | [diff] [blame] | 2932 | sp = kvm_mmu_get_page(vcpu, i << (30 - PAGE_SHIFT), |
| 2933 | i << 30, |
Joerg Roedel | 651dd37 | 2010-09-10 17:30:59 +0200 | [diff] [blame] | 2934 | PT32_ROOT_LEVEL, 1, ACC_ALL, |
| 2935 | NULL); |
| 2936 | root = __pa(sp->spt); |
| 2937 | ++sp->root_count; |
| 2938 | spin_unlock(&vcpu->kvm->mmu_lock); |
| 2939 | vcpu->arch.mmu.pae_root[i] = root | PT_PRESENT_MASK; |
Joerg Roedel | 651dd37 | 2010-09-10 17:30:59 +0200 | [diff] [blame] | 2940 | } |
Xiao Guangrong | 6292757 | 2010-09-27 18:02:12 +0800 | [diff] [blame] | 2941 | vcpu->arch.mmu.root_hpa = __pa(vcpu->arch.mmu.pae_root); |
Joerg Roedel | 651dd37 | 2010-09-10 17:30:59 +0200 | [diff] [blame] | 2942 | } else |
| 2943 | BUG(); |
| 2944 | |
| 2945 | return 0; |
| 2946 | } |
| 2947 | |
| 2948 | static int mmu_alloc_shadow_roots(struct kvm_vcpu *vcpu) |
Avi Kivity | 17ac10a | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 2949 | { |
Avi Kivity | 4db3531 | 2007-11-21 15:28:32 +0200 | [diff] [blame] | 2950 | struct kvm_mmu_page *sp; |
Joerg Roedel | 81407ca | 2010-09-10 17:31:00 +0200 | [diff] [blame] | 2951 | u64 pdptr, pm_mask; |
| 2952 | gfn_t root_gfn; |
| 2953 | int i; |
Avi Kivity | 3bb65a2 | 2007-01-05 16:36:51 -0800 | [diff] [blame] | 2954 | |
Joerg Roedel | 5777ed3 | 2010-09-10 17:30:42 +0200 | [diff] [blame] | 2955 | root_gfn = vcpu->arch.mmu.get_cr3(vcpu) >> PAGE_SHIFT; |
Avi Kivity | 17ac10a | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 2956 | |
Joerg Roedel | 651dd37 | 2010-09-10 17:30:59 +0200 | [diff] [blame] | 2957 | if (mmu_check_root(vcpu, root_gfn)) |
| 2958 | return 1; |
| 2959 | |
| 2960 | /* |
| 2961 | * Do we shadow a long mode page table? If so we need to |
| 2962 | * write-protect the guests page table root. |
| 2963 | */ |
| 2964 | if (vcpu->arch.mmu.root_level == PT64_ROOT_LEVEL) { |
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 | |
| 2967 | ASSERT(!VALID_PAGE(root)); |
Joerg Roedel | 651dd37 | 2010-09-10 17:30:59 +0200 | [diff] [blame] | 2968 | |
Avi Kivity | 8facbbf | 2010-05-04 12:58:32 +0300 | [diff] [blame] | 2969 | spin_lock(&vcpu->kvm->mmu_lock); |
Marcelo Tosatti | 24955b6 | 2010-05-12 21:00:35 -0300 | [diff] [blame] | 2970 | kvm_mmu_free_some_pages(vcpu); |
Joerg Roedel | 651dd37 | 2010-09-10 17:30:59 +0200 | [diff] [blame] | 2971 | sp = kvm_mmu_get_page(vcpu, root_gfn, 0, PT64_ROOT_LEVEL, |
| 2972 | 0, ACC_ALL, NULL); |
Avi Kivity | 4db3531 | 2007-11-21 15:28:32 +0200 | [diff] [blame] | 2973 | root = __pa(sp->spt); |
| 2974 | ++sp->root_count; |
Avi Kivity | 8facbbf | 2010-05-04 12:58:32 +0300 | [diff] [blame] | 2975 | spin_unlock(&vcpu->kvm->mmu_lock); |
Zhang Xiantao | ad312c7 | 2007-12-13 23:50:52 +0800 | [diff] [blame] | 2976 | vcpu->arch.mmu.root_hpa = root; |
Marcelo Tosatti | 8986ecc | 2009-05-12 18:55:45 -0300 | [diff] [blame] | 2977 | return 0; |
Avi Kivity | 17ac10a | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 2978 | } |
Joerg Roedel | f87f928 | 2010-09-02 17:29:45 +0200 | [diff] [blame] | 2979 | |
Joerg Roedel | 651dd37 | 2010-09-10 17:30:59 +0200 | [diff] [blame] | 2980 | /* |
| 2981 | * 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] | 2982 | * or a PAE 3-level page table. In either case we need to be aware that |
| 2983 | * 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] | 2984 | */ |
Joerg Roedel | 81407ca | 2010-09-10 17:31:00 +0200 | [diff] [blame] | 2985 | pm_mask = PT_PRESENT_MASK; |
| 2986 | if (vcpu->arch.mmu.shadow_root_level == PT64_ROOT_LEVEL) |
| 2987 | pm_mask |= PT_ACCESSED_MASK | PT_WRITABLE_MASK | PT_USER_MASK; |
| 2988 | |
Avi Kivity | 17ac10a | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 2989 | for (i = 0; i < 4; ++i) { |
Zhang Xiantao | ad312c7 | 2007-12-13 23:50:52 +0800 | [diff] [blame] | 2990 | hpa_t root = vcpu->arch.mmu.pae_root[i]; |
Avi Kivity | 17ac10a | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 2991 | |
| 2992 | ASSERT(!VALID_PAGE(root)); |
Zhang Xiantao | ad312c7 | 2007-12-13 23:50:52 +0800 | [diff] [blame] | 2993 | if (vcpu->arch.mmu.root_level == PT32E_ROOT_LEVEL) { |
Avi Kivity | e4e517b | 2011-07-28 11:36:17 +0300 | [diff] [blame] | 2994 | pdptr = vcpu->arch.mmu.get_pdptr(vcpu, i); |
Avi Kivity | 43a3795 | 2009-06-10 14:12:05 +0300 | [diff] [blame] | 2995 | if (!is_present_gpte(pdptr)) { |
Zhang Xiantao | ad312c7 | 2007-12-13 23:50:52 +0800 | [diff] [blame] | 2996 | vcpu->arch.mmu.pae_root[i] = 0; |
Avi Kivity | 417726a | 2007-04-12 17:35:58 +0300 | [diff] [blame] | 2997 | continue; |
| 2998 | } |
Avi Kivity | 6de4f3a | 2009-05-31 22:58:47 +0300 | [diff] [blame] | 2999 | root_gfn = pdptr >> PAGE_SHIFT; |
Joerg Roedel | f87f928 | 2010-09-02 17:29:45 +0200 | [diff] [blame] | 3000 | if (mmu_check_root(vcpu, root_gfn)) |
| 3001 | return 1; |
Eric Northup | 5a7388c | 2010-04-26 17:00:05 -0700 | [diff] [blame] | 3002 | } |
Avi Kivity | 8facbbf | 2010-05-04 12:58:32 +0300 | [diff] [blame] | 3003 | spin_lock(&vcpu->kvm->mmu_lock); |
Marcelo Tosatti | 24955b6 | 2010-05-12 21:00:35 -0300 | [diff] [blame] | 3004 | kvm_mmu_free_some_pages(vcpu); |
Avi Kivity | 4db3531 | 2007-11-21 15:28:32 +0200 | [diff] [blame] | 3005 | sp = kvm_mmu_get_page(vcpu, root_gfn, i << 30, |
Joerg Roedel | 651dd37 | 2010-09-10 17:30:59 +0200 | [diff] [blame] | 3006 | PT32_ROOT_LEVEL, 0, |
Avi Kivity | f7d9c7b | 2008-02-26 22:12:10 +0200 | [diff] [blame] | 3007 | ACC_ALL, NULL); |
Avi Kivity | 4db3531 | 2007-11-21 15:28:32 +0200 | [diff] [blame] | 3008 | root = __pa(sp->spt); |
| 3009 | ++sp->root_count; |
Avi Kivity | 8facbbf | 2010-05-04 12:58:32 +0300 | [diff] [blame] | 3010 | spin_unlock(&vcpu->kvm->mmu_lock); |
| 3011 | |
Joerg Roedel | 81407ca | 2010-09-10 17:31:00 +0200 | [diff] [blame] | 3012 | vcpu->arch.mmu.pae_root[i] = root | pm_mask; |
Avi Kivity | 17ac10a | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 3013 | } |
Xiao Guangrong | 6292757 | 2010-09-27 18:02:12 +0800 | [diff] [blame] | 3014 | vcpu->arch.mmu.root_hpa = __pa(vcpu->arch.mmu.pae_root); |
Joerg Roedel | 81407ca | 2010-09-10 17:31:00 +0200 | [diff] [blame] | 3015 | |
| 3016 | /* |
| 3017 | * If we shadow a 32 bit page table with a long mode page |
| 3018 | * table we enter this path. |
| 3019 | */ |
| 3020 | if (vcpu->arch.mmu.shadow_root_level == PT64_ROOT_LEVEL) { |
| 3021 | if (vcpu->arch.mmu.lm_root == NULL) { |
| 3022 | /* |
| 3023 | * The additional page necessary for this is only |
| 3024 | * allocated on demand. |
| 3025 | */ |
| 3026 | |
| 3027 | u64 *lm_root; |
| 3028 | |
| 3029 | lm_root = (void*)get_zeroed_page(GFP_KERNEL); |
| 3030 | if (lm_root == NULL) |
| 3031 | return 1; |
| 3032 | |
| 3033 | lm_root[0] = __pa(vcpu->arch.mmu.pae_root) | pm_mask; |
| 3034 | |
| 3035 | vcpu->arch.mmu.lm_root = lm_root; |
| 3036 | } |
| 3037 | |
| 3038 | vcpu->arch.mmu.root_hpa = __pa(vcpu->arch.mmu.lm_root); |
| 3039 | } |
| 3040 | |
Marcelo Tosatti | 8986ecc | 2009-05-12 18:55:45 -0300 | [diff] [blame] | 3041 | return 0; |
Avi Kivity | 17ac10a | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 3042 | } |
| 3043 | |
Joerg Roedel | 651dd37 | 2010-09-10 17:30:59 +0200 | [diff] [blame] | 3044 | static int mmu_alloc_roots(struct kvm_vcpu *vcpu) |
| 3045 | { |
| 3046 | if (vcpu->arch.mmu.direct_map) |
| 3047 | return mmu_alloc_direct_roots(vcpu); |
| 3048 | else |
| 3049 | return mmu_alloc_shadow_roots(vcpu); |
| 3050 | } |
| 3051 | |
Marcelo Tosatti | 0ba73cd | 2008-09-23 13:18:34 -0300 | [diff] [blame] | 3052 | static void mmu_sync_roots(struct kvm_vcpu *vcpu) |
| 3053 | { |
| 3054 | int i; |
| 3055 | struct kvm_mmu_page *sp; |
| 3056 | |
Joerg Roedel | 81407ca | 2010-09-10 17:31:00 +0200 | [diff] [blame] | 3057 | if (vcpu->arch.mmu.direct_map) |
| 3058 | return; |
| 3059 | |
Marcelo Tosatti | 0ba73cd | 2008-09-23 13:18:34 -0300 | [diff] [blame] | 3060 | if (!VALID_PAGE(vcpu->arch.mmu.root_hpa)) |
| 3061 | return; |
Xiao Guangrong | 6903074 | 2010-09-27 18:09:29 +0800 | [diff] [blame] | 3062 | |
Xiao Guangrong | bebb106 | 2011-07-12 03:23:20 +0800 | [diff] [blame] | 3063 | vcpu_clear_mmio_info(vcpu, ~0ul); |
Xiao Guangrong | 0375f7f | 2011-11-28 20:41:00 +0800 | [diff] [blame] | 3064 | kvm_mmu_audit(vcpu, AUDIT_PRE_SYNC); |
Joerg Roedel | 81407ca | 2010-09-10 17:31:00 +0200 | [diff] [blame] | 3065 | if (vcpu->arch.mmu.root_level == PT64_ROOT_LEVEL) { |
Marcelo Tosatti | 0ba73cd | 2008-09-23 13:18:34 -0300 | [diff] [blame] | 3066 | hpa_t root = vcpu->arch.mmu.root_hpa; |
| 3067 | sp = page_header(root); |
| 3068 | mmu_sync_children(vcpu, sp); |
Xiao Guangrong | 0375f7f | 2011-11-28 20:41:00 +0800 | [diff] [blame] | 3069 | kvm_mmu_audit(vcpu, AUDIT_POST_SYNC); |
Marcelo Tosatti | 0ba73cd | 2008-09-23 13:18:34 -0300 | [diff] [blame] | 3070 | return; |
| 3071 | } |
| 3072 | for (i = 0; i < 4; ++i) { |
| 3073 | hpa_t root = vcpu->arch.mmu.pae_root[i]; |
| 3074 | |
Marcelo Tosatti | 8986ecc | 2009-05-12 18:55:45 -0300 | [diff] [blame] | 3075 | if (root && VALID_PAGE(root)) { |
Marcelo Tosatti | 0ba73cd | 2008-09-23 13:18:34 -0300 | [diff] [blame] | 3076 | root &= PT64_BASE_ADDR_MASK; |
| 3077 | sp = page_header(root); |
| 3078 | mmu_sync_children(vcpu, sp); |
| 3079 | } |
| 3080 | } |
Xiao Guangrong | 0375f7f | 2011-11-28 20:41:00 +0800 | [diff] [blame] | 3081 | kvm_mmu_audit(vcpu, AUDIT_POST_SYNC); |
Marcelo Tosatti | 0ba73cd | 2008-09-23 13:18:34 -0300 | [diff] [blame] | 3082 | } |
| 3083 | |
| 3084 | void kvm_mmu_sync_roots(struct kvm_vcpu *vcpu) |
| 3085 | { |
| 3086 | spin_lock(&vcpu->kvm->mmu_lock); |
| 3087 | mmu_sync_roots(vcpu); |
| 3088 | spin_unlock(&vcpu->kvm->mmu_lock); |
| 3089 | } |
| 3090 | |
Gleb Natapov | 1871c60 | 2010-02-10 14:21:32 +0200 | [diff] [blame] | 3091 | 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] | 3092 | u32 access, struct x86_exception *exception) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3093 | { |
Avi Kivity | ab9ae31 | 2010-11-22 17:53:26 +0200 | [diff] [blame] | 3094 | if (exception) |
| 3095 | exception->error_code = 0; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3096 | return vaddr; |
| 3097 | } |
| 3098 | |
Joerg Roedel | 6539e73 | 2010-09-10 17:30:50 +0200 | [diff] [blame] | 3099 | 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] | 3100 | u32 access, |
| 3101 | struct x86_exception *exception) |
Joerg Roedel | 6539e73 | 2010-09-10 17:30:50 +0200 | [diff] [blame] | 3102 | { |
Avi Kivity | ab9ae31 | 2010-11-22 17:53:26 +0200 | [diff] [blame] | 3103 | if (exception) |
| 3104 | exception->error_code = 0; |
Joerg Roedel | 6539e73 | 2010-09-10 17:30:50 +0200 | [diff] [blame] | 3105 | return vcpu->arch.nested_mmu.translate_gpa(vcpu, vaddr, access); |
| 3106 | } |
| 3107 | |
Xiao Guangrong | ce88dec | 2011-07-12 03:33:44 +0800 | [diff] [blame] | 3108 | static bool quickly_check_mmio_pf(struct kvm_vcpu *vcpu, u64 addr, bool direct) |
| 3109 | { |
| 3110 | if (direct) |
| 3111 | return vcpu_match_mmio_gpa(vcpu, addr); |
| 3112 | |
| 3113 | return vcpu_match_mmio_gva(vcpu, addr); |
| 3114 | } |
| 3115 | |
| 3116 | |
| 3117 | /* |
| 3118 | * On direct hosts, the last spte is only allows two states |
| 3119 | * for mmio page fault: |
| 3120 | * - It is the mmio spte |
| 3121 | * - It is zapped or it is being zapped. |
| 3122 | * |
| 3123 | * This function completely checks the spte when the last spte |
| 3124 | * is not the mmio spte. |
| 3125 | */ |
| 3126 | static bool check_direct_spte_mmio_pf(u64 spte) |
| 3127 | { |
| 3128 | return __check_direct_spte_mmio_pf(spte); |
| 3129 | } |
| 3130 | |
| 3131 | static u64 walk_shadow_page_get_mmio_spte(struct kvm_vcpu *vcpu, u64 addr) |
| 3132 | { |
| 3133 | struct kvm_shadow_walk_iterator iterator; |
| 3134 | u64 spte = 0ull; |
| 3135 | |
| 3136 | walk_shadow_page_lockless_begin(vcpu); |
| 3137 | for_each_shadow_entry_lockless(vcpu, addr, iterator, spte) |
| 3138 | if (!is_shadow_present_pte(spte)) |
| 3139 | break; |
| 3140 | walk_shadow_page_lockless_end(vcpu); |
| 3141 | |
| 3142 | return spte; |
| 3143 | } |
| 3144 | |
| 3145 | /* |
| 3146 | * If it is a real mmio page fault, return 1 and emulat the instruction |
| 3147 | * directly, return 0 to let CPU fault again on the address, -1 is |
| 3148 | * returned if bug is detected. |
| 3149 | */ |
| 3150 | int handle_mmio_page_fault_common(struct kvm_vcpu *vcpu, u64 addr, bool direct) |
| 3151 | { |
| 3152 | u64 spte; |
| 3153 | |
| 3154 | if (quickly_check_mmio_pf(vcpu, addr, direct)) |
| 3155 | return 1; |
| 3156 | |
| 3157 | spte = walk_shadow_page_get_mmio_spte(vcpu, addr); |
| 3158 | |
| 3159 | if (is_mmio_spte(spte)) { |
| 3160 | gfn_t gfn = get_mmio_spte_gfn(spte); |
| 3161 | unsigned access = get_mmio_spte_access(spte); |
| 3162 | |
| 3163 | if (direct) |
| 3164 | addr = 0; |
Xiao Guangrong | 4f02264 | 2011-07-12 03:34:24 +0800 | [diff] [blame] | 3165 | |
| 3166 | trace_handle_mmio_page_fault(addr, gfn, access); |
Xiao Guangrong | ce88dec | 2011-07-12 03:33:44 +0800 | [diff] [blame] | 3167 | vcpu_cache_mmio_info(vcpu, addr, gfn, access); |
| 3168 | return 1; |
| 3169 | } |
| 3170 | |
| 3171 | /* |
| 3172 | * It's ok if the gva is remapped by other cpus on shadow guest, |
| 3173 | * it's a BUG if the gfn is not a mmio page. |
| 3174 | */ |
| 3175 | if (direct && !check_direct_spte_mmio_pf(spte)) |
| 3176 | return -1; |
| 3177 | |
| 3178 | /* |
| 3179 | * If the page table is zapped by other cpus, let CPU fault again on |
| 3180 | * the address. |
| 3181 | */ |
| 3182 | return 0; |
| 3183 | } |
| 3184 | EXPORT_SYMBOL_GPL(handle_mmio_page_fault_common); |
| 3185 | |
| 3186 | static int handle_mmio_page_fault(struct kvm_vcpu *vcpu, u64 addr, |
| 3187 | u32 error_code, bool direct) |
| 3188 | { |
| 3189 | int ret; |
| 3190 | |
| 3191 | ret = handle_mmio_page_fault_common(vcpu, addr, direct); |
| 3192 | WARN_ON(ret < 0); |
| 3193 | return ret; |
| 3194 | } |
| 3195 | |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3196 | static int nonpaging_page_fault(struct kvm_vcpu *vcpu, gva_t gva, |
Xiao Guangrong | 78b2c54 | 2010-12-07 10:48:06 +0800 | [diff] [blame] | 3197 | u32 error_code, bool prefault) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3198 | { |
Avi Kivity | e833240 | 2007-12-09 18:43:00 +0200 | [diff] [blame] | 3199 | gfn_t gfn; |
Avi Kivity | e2dec93 | 2007-01-05 16:36:54 -0800 | [diff] [blame] | 3200 | int r; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3201 | |
Harvey Harrison | b8688d5 | 2008-03-03 12:59:56 -0800 | [diff] [blame] | 3202 | pgprintk("%s: gva %lx error %x\n", __func__, gva, error_code); |
Xiao Guangrong | ce88dec | 2011-07-12 03:33:44 +0800 | [diff] [blame] | 3203 | |
| 3204 | if (unlikely(error_code & PFERR_RSVD_MASK)) |
| 3205 | return handle_mmio_page_fault(vcpu, gva, error_code, true); |
| 3206 | |
Avi Kivity | e2dec93 | 2007-01-05 16:36:54 -0800 | [diff] [blame] | 3207 | r = mmu_topup_memory_caches(vcpu); |
| 3208 | if (r) |
| 3209 | return r; |
Avi Kivity | 714b93d | 2007-01-05 16:36:53 -0800 | [diff] [blame] | 3210 | |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3211 | ASSERT(vcpu); |
Zhang Xiantao | ad312c7 | 2007-12-13 23:50:52 +0800 | [diff] [blame] | 3212 | ASSERT(VALID_PAGE(vcpu->arch.mmu.root_hpa)); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3213 | |
Avi Kivity | e833240 | 2007-12-09 18:43:00 +0200 | [diff] [blame] | 3214 | gfn = gva >> PAGE_SHIFT; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3215 | |
Avi Kivity | e833240 | 2007-12-09 18:43:00 +0200 | [diff] [blame] | 3216 | return nonpaging_map(vcpu, gva & PAGE_MASK, |
Xiao Guangrong | c7ba5b4 | 2012-06-20 15:59:18 +0800 | [diff] [blame] | 3217 | error_code, gfn, prefault); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3218 | } |
| 3219 | |
Jan Kiszka | 7e1fbea | 2010-10-20 15:18:02 +0200 | [diff] [blame] | 3220 | 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] | 3221 | { |
| 3222 | struct kvm_arch_async_pf arch; |
Xiao Guangrong | fb67e14 | 2010-12-07 10:35:25 +0800 | [diff] [blame] | 3223 | |
Gleb Natapov | 7c90705 | 2010-10-14 11:22:53 +0200 | [diff] [blame] | 3224 | arch.token = (vcpu->arch.apf.id++ << 12) | vcpu->vcpu_id; |
Gleb Natapov | af585b9 | 2010-10-14 11:22:46 +0200 | [diff] [blame] | 3225 | arch.gfn = gfn; |
Xiao Guangrong | c4806ac | 2010-11-12 14:49:55 +0800 | [diff] [blame] | 3226 | arch.direct_map = vcpu->arch.mmu.direct_map; |
Xiao Guangrong | fb67e14 | 2010-12-07 10:35:25 +0800 | [diff] [blame] | 3227 | arch.cr3 = vcpu->arch.mmu.get_cr3(vcpu); |
Gleb Natapov | af585b9 | 2010-10-14 11:22:46 +0200 | [diff] [blame] | 3228 | |
| 3229 | return kvm_setup_async_pf(vcpu, gva, gfn, &arch); |
| 3230 | } |
| 3231 | |
| 3232 | static bool can_do_async_pf(struct kvm_vcpu *vcpu) |
| 3233 | { |
| 3234 | if (unlikely(!irqchip_in_kernel(vcpu->kvm) || |
| 3235 | kvm_event_needs_reinjection(vcpu))) |
| 3236 | return false; |
| 3237 | |
| 3238 | return kvm_x86_ops->interrupt_allowed(vcpu); |
| 3239 | } |
| 3240 | |
Xiao Guangrong | 78b2c54 | 2010-12-07 10:48:06 +0800 | [diff] [blame] | 3241 | 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] | 3242 | gva_t gva, pfn_t *pfn, bool write, bool *writable) |
Gleb Natapov | af585b9 | 2010-10-14 11:22:46 +0200 | [diff] [blame] | 3243 | { |
| 3244 | bool async; |
| 3245 | |
Marcelo Tosatti | 612819c | 2010-10-22 14:18:18 -0200 | [diff] [blame] | 3246 | *pfn = gfn_to_pfn_async(vcpu->kvm, gfn, &async, write, writable); |
Gleb Natapov | af585b9 | 2010-10-14 11:22:46 +0200 | [diff] [blame] | 3247 | |
| 3248 | if (!async) |
| 3249 | return false; /* *pfn has correct page already */ |
| 3250 | |
Xiao Guangrong | 78b2c54 | 2010-12-07 10:48:06 +0800 | [diff] [blame] | 3251 | if (!prefault && can_do_async_pf(vcpu)) { |
Xiao Guangrong | c9b263d | 2010-11-01 16:58:43 +0800 | [diff] [blame] | 3252 | trace_kvm_try_async_get_page(gva, gfn); |
Gleb Natapov | af585b9 | 2010-10-14 11:22:46 +0200 | [diff] [blame] | 3253 | if (kvm_find_async_pf_gfn(vcpu, gfn)) { |
| 3254 | trace_kvm_async_pf_doublefault(gva, gfn); |
| 3255 | kvm_make_request(KVM_REQ_APF_HALT, vcpu); |
| 3256 | return true; |
| 3257 | } else if (kvm_arch_setup_async_pf(vcpu, gva, gfn)) |
| 3258 | return true; |
| 3259 | } |
| 3260 | |
Marcelo Tosatti | 612819c | 2010-10-22 14:18:18 -0200 | [diff] [blame] | 3261 | *pfn = gfn_to_pfn_prot(vcpu->kvm, gfn, write, writable); |
Gleb Natapov | af585b9 | 2010-10-14 11:22:46 +0200 | [diff] [blame] | 3262 | |
| 3263 | return false; |
| 3264 | } |
| 3265 | |
Gleb Natapov | 56028d0 | 2010-10-17 18:13:42 +0200 | [diff] [blame] | 3266 | 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] | 3267 | bool prefault) |
Joerg Roedel | fb72d16 | 2008-02-07 13:47:44 +0100 | [diff] [blame] | 3268 | { |
Anthony Liguori | 35149e2 | 2008-04-02 14:46:56 -0500 | [diff] [blame] | 3269 | pfn_t pfn; |
Joerg Roedel | fb72d16 | 2008-02-07 13:47:44 +0100 | [diff] [blame] | 3270 | int r; |
Joerg Roedel | 852e3c1 | 2009-07-27 16:30:44 +0200 | [diff] [blame] | 3271 | int level; |
Andrea Arcangeli | 936a5fe | 2011-01-13 15:46:48 -0800 | [diff] [blame] | 3272 | int force_pt_level; |
Marcelo Tosatti | 05da455 | 2008-02-23 11:44:30 -0300 | [diff] [blame] | 3273 | gfn_t gfn = gpa >> PAGE_SHIFT; |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 3274 | unsigned long mmu_seq; |
Marcelo Tosatti | 612819c | 2010-10-22 14:18:18 -0200 | [diff] [blame] | 3275 | int write = error_code & PFERR_WRITE_MASK; |
| 3276 | bool map_writable; |
Joerg Roedel | fb72d16 | 2008-02-07 13:47:44 +0100 | [diff] [blame] | 3277 | |
| 3278 | ASSERT(vcpu); |
| 3279 | ASSERT(VALID_PAGE(vcpu->arch.mmu.root_hpa)); |
| 3280 | |
Xiao Guangrong | ce88dec | 2011-07-12 03:33:44 +0800 | [diff] [blame] | 3281 | if (unlikely(error_code & PFERR_RSVD_MASK)) |
| 3282 | return handle_mmio_page_fault(vcpu, gpa, error_code, true); |
| 3283 | |
Joerg Roedel | fb72d16 | 2008-02-07 13:47:44 +0100 | [diff] [blame] | 3284 | r = mmu_topup_memory_caches(vcpu); |
| 3285 | if (r) |
| 3286 | return r; |
| 3287 | |
Andrea Arcangeli | 936a5fe | 2011-01-13 15:46:48 -0800 | [diff] [blame] | 3288 | force_pt_level = mapping_level_dirty_bitmap(vcpu, gfn); |
| 3289 | if (likely(!force_pt_level)) { |
| 3290 | level = mapping_level(vcpu, gfn); |
| 3291 | gfn &= ~(KVM_PAGES_PER_HPAGE(level) - 1); |
| 3292 | } else |
| 3293 | level = PT_PAGE_TABLE_LEVEL; |
Joerg Roedel | 852e3c1 | 2009-07-27 16:30:44 +0200 | [diff] [blame] | 3294 | |
Xiao Guangrong | c7ba5b4 | 2012-06-20 15:59:18 +0800 | [diff] [blame] | 3295 | if (fast_page_fault(vcpu, gpa, level, error_code)) |
| 3296 | return 0; |
| 3297 | |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 3298 | mmu_seq = vcpu->kvm->mmu_notifier_seq; |
Marcelo Tosatti | 4c2155c | 2008-09-16 20:54:47 -0300 | [diff] [blame] | 3299 | smp_rmb(); |
Gleb Natapov | af585b9 | 2010-10-14 11:22:46 +0200 | [diff] [blame] | 3300 | |
Xiao Guangrong | 78b2c54 | 2010-12-07 10:48:06 +0800 | [diff] [blame] | 3301 | if (try_async_pf(vcpu, prefault, gfn, gpa, &pfn, write, &map_writable)) |
Gleb Natapov | af585b9 | 2010-10-14 11:22:46 +0200 | [diff] [blame] | 3302 | return 0; |
| 3303 | |
Xiao Guangrong | d7c5520 | 2011-07-12 03:29:38 +0800 | [diff] [blame] | 3304 | if (handle_abnormal_pfn(vcpu, 0, gfn, pfn, ACC_ALL, &r)) |
| 3305 | return r; |
| 3306 | |
Joerg Roedel | fb72d16 | 2008-02-07 13:47:44 +0100 | [diff] [blame] | 3307 | spin_lock(&vcpu->kvm->mmu_lock); |
Christoffer Dall | 8ca40a7 | 2012-10-14 23:10:18 -0400 | [diff] [blame] | 3308 | if (mmu_notifier_retry(vcpu->kvm, mmu_seq)) |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 3309 | goto out_unlock; |
Joerg Roedel | fb72d16 | 2008-02-07 13:47:44 +0100 | [diff] [blame] | 3310 | kvm_mmu_free_some_pages(vcpu); |
Andrea Arcangeli | 936a5fe | 2011-01-13 15:46:48 -0800 | [diff] [blame] | 3311 | if (likely(!force_pt_level)) |
| 3312 | transparent_hugepage_adjust(vcpu, &gfn, &pfn, &level); |
Marcelo Tosatti | 612819c | 2010-10-22 14:18:18 -0200 | [diff] [blame] | 3313 | r = __direct_map(vcpu, gpa, write, map_writable, |
Xiao Guangrong | 2ec4739 | 2010-12-07 10:34:42 +0800 | [diff] [blame] | 3314 | level, gfn, pfn, prefault); |
Joerg Roedel | fb72d16 | 2008-02-07 13:47:44 +0100 | [diff] [blame] | 3315 | spin_unlock(&vcpu->kvm->mmu_lock); |
Joerg Roedel | fb72d16 | 2008-02-07 13:47:44 +0100 | [diff] [blame] | 3316 | |
| 3317 | return r; |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 3318 | |
| 3319 | out_unlock: |
| 3320 | spin_unlock(&vcpu->kvm->mmu_lock); |
| 3321 | kvm_release_pfn_clean(pfn); |
| 3322 | return 0; |
Joerg Roedel | fb72d16 | 2008-02-07 13:47:44 +0100 | [diff] [blame] | 3323 | } |
| 3324 | |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3325 | static void nonpaging_free(struct kvm_vcpu *vcpu) |
| 3326 | { |
Avi Kivity | 17ac10a | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 3327 | mmu_free_roots(vcpu); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3328 | } |
| 3329 | |
Joerg Roedel | 52fde8d | 2010-09-10 17:30:44 +0200 | [diff] [blame] | 3330 | static int nonpaging_init_context(struct kvm_vcpu *vcpu, |
| 3331 | struct kvm_mmu *context) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3332 | { |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3333 | context->new_cr3 = nonpaging_new_cr3; |
| 3334 | context->page_fault = nonpaging_page_fault; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3335 | context->gva_to_gpa = nonpaging_gva_to_gpa; |
| 3336 | context->free = nonpaging_free; |
Marcelo Tosatti | e8bc217 | 2008-09-23 13:18:33 -0300 | [diff] [blame] | 3337 | context->sync_page = nonpaging_sync_page; |
Marcelo Tosatti | a705289 | 2008-09-23 13:18:35 -0300 | [diff] [blame] | 3338 | context->invlpg = nonpaging_invlpg; |
Xiao Guangrong | 0f53b5b | 2011-03-09 15:43:51 +0800 | [diff] [blame] | 3339 | context->update_pte = nonpaging_update_pte; |
Avi Kivity | cea0f0e | 2007-01-05 16:36:43 -0800 | [diff] [blame] | 3340 | context->root_level = 0; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3341 | context->shadow_root_level = PT32E_ROOT_LEVEL; |
Avi Kivity | 17c3ba9 | 2007-06-04 15:58:30 +0300 | [diff] [blame] | 3342 | context->root_hpa = INVALID_PAGE; |
Joerg Roedel | c5a78f2b | 2010-09-10 17:30:39 +0200 | [diff] [blame] | 3343 | context->direct_map = true; |
Joerg Roedel | 2d48a98 | 2010-09-10 17:31:01 +0200 | [diff] [blame] | 3344 | context->nx = false; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3345 | return 0; |
| 3346 | } |
| 3347 | |
Avi Kivity | d835dfe | 2007-11-21 02:57:59 +0200 | [diff] [blame] | 3348 | void kvm_mmu_flush_tlb(struct kvm_vcpu *vcpu) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3349 | { |
Avi Kivity | 1165f5f | 2007-04-19 17:27:43 +0300 | [diff] [blame] | 3350 | ++vcpu->stat.tlb_flush; |
Avi Kivity | a8eeb04 | 2010-05-10 12:34:53 +0300 | [diff] [blame] | 3351 | kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3352 | } |
| 3353 | |
| 3354 | static void paging_new_cr3(struct kvm_vcpu *vcpu) |
| 3355 | { |
Avi Kivity | 9f8fe50 | 2010-12-05 17:30:00 +0200 | [diff] [blame] | 3356 | pgprintk("%s: cr3 %lx\n", __func__, kvm_read_cr3(vcpu)); |
Avi Kivity | cea0f0e | 2007-01-05 16:36:43 -0800 | [diff] [blame] | 3357 | mmu_free_roots(vcpu); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3358 | } |
| 3359 | |
Joerg Roedel | 5777ed3 | 2010-09-10 17:30:42 +0200 | [diff] [blame] | 3360 | static unsigned long get_cr3(struct kvm_vcpu *vcpu) |
| 3361 | { |
Avi Kivity | 9f8fe50 | 2010-12-05 17:30:00 +0200 | [diff] [blame] | 3362 | return kvm_read_cr3(vcpu); |
Joerg Roedel | 5777ed3 | 2010-09-10 17:30:42 +0200 | [diff] [blame] | 3363 | } |
| 3364 | |
Avi Kivity | 6389ee9 | 2010-11-29 16:12:30 +0200 | [diff] [blame] | 3365 | static void inject_page_fault(struct kvm_vcpu *vcpu, |
| 3366 | struct x86_exception *fault) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3367 | { |
Avi Kivity | 6389ee9 | 2010-11-29 16:12:30 +0200 | [diff] [blame] | 3368 | vcpu->arch.mmu.inject_page_fault(vcpu, fault); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3369 | } |
| 3370 | |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3371 | static void paging_free(struct kvm_vcpu *vcpu) |
| 3372 | { |
| 3373 | nonpaging_free(vcpu); |
| 3374 | } |
| 3375 | |
Avi Kivity | 8ea667f | 2012-09-12 13:44:53 +0300 | [diff] [blame] | 3376 | static inline void protect_clean_gpte(unsigned *access, unsigned gpte) |
| 3377 | { |
| 3378 | unsigned mask; |
| 3379 | |
| 3380 | BUILD_BUG_ON(PT_WRITABLE_MASK != ACC_WRITE_MASK); |
| 3381 | |
| 3382 | mask = (unsigned)~ACC_WRITE_MASK; |
| 3383 | /* Allow write access to dirty gptes */ |
| 3384 | mask |= (gpte >> (PT_DIRTY_SHIFT - PT_WRITABLE_SHIFT)) & PT_WRITABLE_MASK; |
| 3385 | *access &= mask; |
| 3386 | } |
| 3387 | |
Xiao Guangrong | ce88dec | 2011-07-12 03:33:44 +0800 | [diff] [blame] | 3388 | static bool sync_mmio_spte(u64 *sptep, gfn_t gfn, unsigned access, |
| 3389 | int *nr_present) |
| 3390 | { |
| 3391 | if (unlikely(is_mmio_spte(*sptep))) { |
| 3392 | if (gfn != get_mmio_spte_gfn(*sptep)) { |
| 3393 | mmu_spte_clear_no_track(sptep); |
| 3394 | return true; |
| 3395 | } |
| 3396 | |
| 3397 | (*nr_present)++; |
| 3398 | mark_mmio_spte(sptep, gfn, access); |
| 3399 | return true; |
| 3400 | } |
| 3401 | |
| 3402 | return false; |
| 3403 | } |
| 3404 | |
Avi Kivity | 3d34ade | 2012-09-12 14:03:28 +0300 | [diff] [blame] | 3405 | static inline unsigned gpte_access(struct kvm_vcpu *vcpu, u64 gpte) |
| 3406 | { |
| 3407 | unsigned access; |
| 3408 | |
| 3409 | access = (gpte & (PT_WRITABLE_MASK | PT_USER_MASK)) | ACC_EXEC_MASK; |
| 3410 | access &= ~(gpte >> PT64_NX_SHIFT); |
| 3411 | |
| 3412 | return access; |
| 3413 | } |
| 3414 | |
Avi Kivity | 6fd01b7 | 2012-09-12 20:46:56 +0300 | [diff] [blame] | 3415 | static inline bool is_last_gpte(struct kvm_mmu *mmu, unsigned level, unsigned gpte) |
| 3416 | { |
| 3417 | unsigned index; |
| 3418 | |
| 3419 | index = level - 1; |
| 3420 | index |= (gpte & PT_PAGE_SIZE_MASK) >> (PT_PAGE_SIZE_SHIFT - 2); |
| 3421 | return mmu->last_pte_bitmap & (1 << index); |
| 3422 | } |
| 3423 | |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3424 | #define PTTYPE 64 |
| 3425 | #include "paging_tmpl.h" |
| 3426 | #undef PTTYPE |
| 3427 | |
| 3428 | #define PTTYPE 32 |
| 3429 | #include "paging_tmpl.h" |
| 3430 | #undef PTTYPE |
| 3431 | |
Joerg Roedel | 52fde8d | 2010-09-10 17:30:44 +0200 | [diff] [blame] | 3432 | static void reset_rsvds_bits_mask(struct kvm_vcpu *vcpu, |
Davidlohr Bueso | 4d6931c | 2012-03-05 16:53:06 +0100 | [diff] [blame] | 3433 | struct kvm_mmu *context) |
Dong, Eddie | 82725b2 | 2009-03-30 16:21:08 +0800 | [diff] [blame] | 3434 | { |
Dong, Eddie | 82725b2 | 2009-03-30 16:21:08 +0800 | [diff] [blame] | 3435 | int maxphyaddr = cpuid_maxphyaddr(vcpu); |
| 3436 | u64 exb_bit_rsvd = 0; |
| 3437 | |
Joerg Roedel | 2d48a98 | 2010-09-10 17:31:01 +0200 | [diff] [blame] | 3438 | if (!context->nx) |
Dong, Eddie | 82725b2 | 2009-03-30 16:21:08 +0800 | [diff] [blame] | 3439 | exb_bit_rsvd = rsvd_bits(63, 63); |
Davidlohr Bueso | 4d6931c | 2012-03-05 16:53:06 +0100 | [diff] [blame] | 3440 | switch (context->root_level) { |
Dong, Eddie | 82725b2 | 2009-03-30 16:21:08 +0800 | [diff] [blame] | 3441 | case PT32_ROOT_LEVEL: |
| 3442 | /* no rsvd bits for 2 level 4K page table entries */ |
| 3443 | context->rsvd_bits_mask[0][1] = 0; |
| 3444 | context->rsvd_bits_mask[0][0] = 0; |
Xiao Guangrong | f815bce | 2010-03-19 17:58:53 +0800 | [diff] [blame] | 3445 | context->rsvd_bits_mask[1][0] = context->rsvd_bits_mask[0][0]; |
| 3446 | |
| 3447 | if (!is_pse(vcpu)) { |
| 3448 | context->rsvd_bits_mask[1][1] = 0; |
| 3449 | break; |
| 3450 | } |
| 3451 | |
Dong, Eddie | 82725b2 | 2009-03-30 16:21:08 +0800 | [diff] [blame] | 3452 | if (is_cpuid_PSE36()) |
| 3453 | /* 36bits PSE 4MB page */ |
| 3454 | context->rsvd_bits_mask[1][1] = rsvd_bits(17, 21); |
| 3455 | else |
| 3456 | /* 32 bits PSE 4MB page */ |
| 3457 | context->rsvd_bits_mask[1][1] = rsvd_bits(13, 21); |
Dong, Eddie | 82725b2 | 2009-03-30 16:21:08 +0800 | [diff] [blame] | 3458 | break; |
| 3459 | case PT32E_ROOT_LEVEL: |
Dong, Eddie | 20c466b | 2009-03-31 23:03:45 +0800 | [diff] [blame] | 3460 | context->rsvd_bits_mask[0][2] = |
| 3461 | rsvd_bits(maxphyaddr, 63) | |
| 3462 | rsvd_bits(7, 8) | rsvd_bits(1, 2); /* PDPTE */ |
Dong, Eddie | 82725b2 | 2009-03-30 16:21:08 +0800 | [diff] [blame] | 3463 | context->rsvd_bits_mask[0][1] = exb_bit_rsvd | |
Sheng Yang | 4c26b4c | 2009-04-02 10:28:37 +0800 | [diff] [blame] | 3464 | rsvd_bits(maxphyaddr, 62); /* PDE */ |
Dong, Eddie | 82725b2 | 2009-03-30 16:21:08 +0800 | [diff] [blame] | 3465 | context->rsvd_bits_mask[0][0] = exb_bit_rsvd | |
| 3466 | rsvd_bits(maxphyaddr, 62); /* PTE */ |
| 3467 | context->rsvd_bits_mask[1][1] = exb_bit_rsvd | |
| 3468 | rsvd_bits(maxphyaddr, 62) | |
| 3469 | rsvd_bits(13, 20); /* large page */ |
Xiao Guangrong | f815bce | 2010-03-19 17:58:53 +0800 | [diff] [blame] | 3470 | context->rsvd_bits_mask[1][0] = context->rsvd_bits_mask[0][0]; |
Dong, Eddie | 82725b2 | 2009-03-30 16:21:08 +0800 | [diff] [blame] | 3471 | break; |
| 3472 | case PT64_ROOT_LEVEL: |
| 3473 | context->rsvd_bits_mask[0][3] = exb_bit_rsvd | |
| 3474 | rsvd_bits(maxphyaddr, 51) | rsvd_bits(7, 8); |
| 3475 | context->rsvd_bits_mask[0][2] = exb_bit_rsvd | |
| 3476 | rsvd_bits(maxphyaddr, 51) | rsvd_bits(7, 8); |
| 3477 | context->rsvd_bits_mask[0][1] = exb_bit_rsvd | |
Sheng Yang | 4c26b4c | 2009-04-02 10:28:37 +0800 | [diff] [blame] | 3478 | rsvd_bits(maxphyaddr, 51); |
Dong, Eddie | 82725b2 | 2009-03-30 16:21:08 +0800 | [diff] [blame] | 3479 | context->rsvd_bits_mask[0][0] = exb_bit_rsvd | |
| 3480 | rsvd_bits(maxphyaddr, 51); |
| 3481 | context->rsvd_bits_mask[1][3] = context->rsvd_bits_mask[0][3]; |
Joerg Roedel | e04da98 | 2009-07-27 16:30:45 +0200 | [diff] [blame] | 3482 | context->rsvd_bits_mask[1][2] = exb_bit_rsvd | |
| 3483 | rsvd_bits(maxphyaddr, 51) | |
| 3484 | rsvd_bits(13, 29); |
Dong, Eddie | 82725b2 | 2009-03-30 16:21:08 +0800 | [diff] [blame] | 3485 | context->rsvd_bits_mask[1][1] = exb_bit_rsvd | |
Sheng Yang | 4c26b4c | 2009-04-02 10:28:37 +0800 | [diff] [blame] | 3486 | rsvd_bits(maxphyaddr, 51) | |
| 3487 | rsvd_bits(13, 20); /* large page */ |
Xiao Guangrong | f815bce | 2010-03-19 17:58:53 +0800 | [diff] [blame] | 3488 | context->rsvd_bits_mask[1][0] = context->rsvd_bits_mask[0][0]; |
Dong, Eddie | 82725b2 | 2009-03-30 16:21:08 +0800 | [diff] [blame] | 3489 | break; |
| 3490 | } |
| 3491 | } |
| 3492 | |
Avi Kivity | 97d64b7 | 2012-09-12 14:52:00 +0300 | [diff] [blame] | 3493 | static void update_permission_bitmask(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu) |
| 3494 | { |
| 3495 | unsigned bit, byte, pfec; |
| 3496 | u8 map; |
| 3497 | bool fault, x, w, u, wf, uf, ff, smep; |
| 3498 | |
| 3499 | smep = kvm_read_cr4_bits(vcpu, X86_CR4_SMEP); |
| 3500 | for (byte = 0; byte < ARRAY_SIZE(mmu->permissions); ++byte) { |
| 3501 | pfec = byte << 1; |
| 3502 | map = 0; |
| 3503 | wf = pfec & PFERR_WRITE_MASK; |
| 3504 | uf = pfec & PFERR_USER_MASK; |
| 3505 | ff = pfec & PFERR_FETCH_MASK; |
| 3506 | for (bit = 0; bit < 8; ++bit) { |
| 3507 | x = bit & ACC_EXEC_MASK; |
| 3508 | w = bit & ACC_WRITE_MASK; |
| 3509 | u = bit & ACC_USER_MASK; |
| 3510 | |
| 3511 | /* Not really needed: !nx will cause pte.nx to fault */ |
| 3512 | x |= !mmu->nx; |
| 3513 | /* Allow supervisor writes if !cr0.wp */ |
| 3514 | w |= !is_write_protection(vcpu) && !uf; |
| 3515 | /* Disallow supervisor fetches of user code if cr4.smep */ |
| 3516 | x &= !(smep && u && !uf); |
| 3517 | |
| 3518 | fault = (ff && !x) || (uf && !u) || (wf && !w); |
| 3519 | map |= fault << bit; |
| 3520 | } |
| 3521 | mmu->permissions[byte] = map; |
| 3522 | } |
| 3523 | } |
| 3524 | |
Avi Kivity | 6fd01b7 | 2012-09-12 20:46:56 +0300 | [diff] [blame] | 3525 | static void update_last_pte_bitmap(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu) |
| 3526 | { |
| 3527 | u8 map; |
| 3528 | unsigned level, root_level = mmu->root_level; |
| 3529 | const unsigned ps_set_index = 1 << 2; /* bit 2 of index: ps */ |
| 3530 | |
| 3531 | if (root_level == PT32E_ROOT_LEVEL) |
| 3532 | --root_level; |
| 3533 | /* PT_PAGE_TABLE_LEVEL always terminates */ |
| 3534 | map = 1 | (1 << ps_set_index); |
| 3535 | for (level = PT_DIRECTORY_LEVEL; level <= root_level; ++level) { |
| 3536 | if (level <= PT_PDPE_LEVEL |
| 3537 | && (mmu->root_level >= PT32E_ROOT_LEVEL || is_pse(vcpu))) |
| 3538 | map |= 1 << (ps_set_index | (level - 1)); |
| 3539 | } |
| 3540 | mmu->last_pte_bitmap = map; |
| 3541 | } |
| 3542 | |
Joerg Roedel | 52fde8d | 2010-09-10 17:30:44 +0200 | [diff] [blame] | 3543 | static int paging64_init_context_common(struct kvm_vcpu *vcpu, |
| 3544 | struct kvm_mmu *context, |
| 3545 | int level) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3546 | { |
Joerg Roedel | 2d48a98 | 2010-09-10 17:31:01 +0200 | [diff] [blame] | 3547 | context->nx = is_nx(vcpu); |
Davidlohr Bueso | 4d6931c | 2012-03-05 16:53:06 +0100 | [diff] [blame] | 3548 | context->root_level = level; |
Joerg Roedel | 2d48a98 | 2010-09-10 17:31:01 +0200 | [diff] [blame] | 3549 | |
Davidlohr Bueso | 4d6931c | 2012-03-05 16:53:06 +0100 | [diff] [blame] | 3550 | reset_rsvds_bits_mask(vcpu, context); |
Avi Kivity | 97d64b7 | 2012-09-12 14:52:00 +0300 | [diff] [blame] | 3551 | update_permission_bitmask(vcpu, context); |
Avi Kivity | 6fd01b7 | 2012-09-12 20:46:56 +0300 | [diff] [blame] | 3552 | update_last_pte_bitmap(vcpu, context); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3553 | |
| 3554 | ASSERT(is_pae(vcpu)); |
| 3555 | context->new_cr3 = paging_new_cr3; |
| 3556 | context->page_fault = paging64_page_fault; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3557 | context->gva_to_gpa = paging64_gva_to_gpa; |
Marcelo Tosatti | e8bc217 | 2008-09-23 13:18:33 -0300 | [diff] [blame] | 3558 | context->sync_page = paging64_sync_page; |
Marcelo Tosatti | a705289 | 2008-09-23 13:18:35 -0300 | [diff] [blame] | 3559 | context->invlpg = paging64_invlpg; |
Xiao Guangrong | 0f53b5b | 2011-03-09 15:43:51 +0800 | [diff] [blame] | 3560 | context->update_pte = paging64_update_pte; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3561 | context->free = paging_free; |
Avi Kivity | 17ac10a | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 3562 | context->shadow_root_level = level; |
Avi Kivity | 17c3ba9 | 2007-06-04 15:58:30 +0300 | [diff] [blame] | 3563 | context->root_hpa = INVALID_PAGE; |
Joerg Roedel | c5a78f2b | 2010-09-10 17:30:39 +0200 | [diff] [blame] | 3564 | context->direct_map = false; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3565 | return 0; |
| 3566 | } |
| 3567 | |
Joerg Roedel | 52fde8d | 2010-09-10 17:30:44 +0200 | [diff] [blame] | 3568 | static int paging64_init_context(struct kvm_vcpu *vcpu, |
| 3569 | struct kvm_mmu *context) |
Avi Kivity | 17ac10a | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 3570 | { |
Joerg Roedel | 52fde8d | 2010-09-10 17:30:44 +0200 | [diff] [blame] | 3571 | return paging64_init_context_common(vcpu, context, PT64_ROOT_LEVEL); |
Avi Kivity | 17ac10a | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 3572 | } |
| 3573 | |
Joerg Roedel | 52fde8d | 2010-09-10 17:30:44 +0200 | [diff] [blame] | 3574 | static int paging32_init_context(struct kvm_vcpu *vcpu, |
| 3575 | struct kvm_mmu *context) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3576 | { |
Joerg Roedel | 2d48a98 | 2010-09-10 17:31:01 +0200 | [diff] [blame] | 3577 | context->nx = false; |
Davidlohr Bueso | 4d6931c | 2012-03-05 16:53:06 +0100 | [diff] [blame] | 3578 | context->root_level = PT32_ROOT_LEVEL; |
Joerg Roedel | 2d48a98 | 2010-09-10 17:31:01 +0200 | [diff] [blame] | 3579 | |
Davidlohr Bueso | 4d6931c | 2012-03-05 16:53:06 +0100 | [diff] [blame] | 3580 | reset_rsvds_bits_mask(vcpu, context); |
Avi Kivity | 97d64b7 | 2012-09-12 14:52:00 +0300 | [diff] [blame] | 3581 | update_permission_bitmask(vcpu, context); |
Avi Kivity | 6fd01b7 | 2012-09-12 20:46:56 +0300 | [diff] [blame] | 3582 | update_last_pte_bitmap(vcpu, context); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3583 | |
| 3584 | context->new_cr3 = paging_new_cr3; |
| 3585 | context->page_fault = paging32_page_fault; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3586 | context->gva_to_gpa = paging32_gva_to_gpa; |
| 3587 | context->free = paging_free; |
Marcelo Tosatti | e8bc217 | 2008-09-23 13:18:33 -0300 | [diff] [blame] | 3588 | context->sync_page = paging32_sync_page; |
Marcelo Tosatti | a705289 | 2008-09-23 13:18:35 -0300 | [diff] [blame] | 3589 | context->invlpg = paging32_invlpg; |
Xiao Guangrong | 0f53b5b | 2011-03-09 15:43:51 +0800 | [diff] [blame] | 3590 | context->update_pte = paging32_update_pte; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3591 | context->shadow_root_level = PT32E_ROOT_LEVEL; |
Avi Kivity | 17c3ba9 | 2007-06-04 15:58:30 +0300 | [diff] [blame] | 3592 | context->root_hpa = INVALID_PAGE; |
Joerg Roedel | c5a78f2b | 2010-09-10 17:30:39 +0200 | [diff] [blame] | 3593 | context->direct_map = false; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3594 | return 0; |
| 3595 | } |
| 3596 | |
Joerg Roedel | 52fde8d | 2010-09-10 17:30:44 +0200 | [diff] [blame] | 3597 | static int paging32E_init_context(struct kvm_vcpu *vcpu, |
| 3598 | struct kvm_mmu *context) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3599 | { |
Joerg Roedel | 52fde8d | 2010-09-10 17:30:44 +0200 | [diff] [blame] | 3600 | return paging64_init_context_common(vcpu, context, PT32E_ROOT_LEVEL); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3601 | } |
| 3602 | |
Joerg Roedel | fb72d16 | 2008-02-07 13:47:44 +0100 | [diff] [blame] | 3603 | static int init_kvm_tdp_mmu(struct kvm_vcpu *vcpu) |
| 3604 | { |
Joerg Roedel | 14dfe85 | 2010-09-10 17:30:49 +0200 | [diff] [blame] | 3605 | struct kvm_mmu *context = vcpu->arch.walk_mmu; |
Joerg Roedel | fb72d16 | 2008-02-07 13:47:44 +0100 | [diff] [blame] | 3606 | |
Avi Kivity | c445f8e | 2010-12-21 16:26:01 +0200 | [diff] [blame] | 3607 | context->base_role.word = 0; |
Joerg Roedel | fb72d16 | 2008-02-07 13:47:44 +0100 | [diff] [blame] | 3608 | context->new_cr3 = nonpaging_new_cr3; |
| 3609 | context->page_fault = tdp_page_fault; |
| 3610 | context->free = nonpaging_free; |
Marcelo Tosatti | e8bc217 | 2008-09-23 13:18:33 -0300 | [diff] [blame] | 3611 | context->sync_page = nonpaging_sync_page; |
Marcelo Tosatti | a705289 | 2008-09-23 13:18:35 -0300 | [diff] [blame] | 3612 | context->invlpg = nonpaging_invlpg; |
Xiao Guangrong | 0f53b5b | 2011-03-09 15:43:51 +0800 | [diff] [blame] | 3613 | context->update_pte = nonpaging_update_pte; |
Sheng Yang | 67253af | 2008-04-25 10:20:22 +0800 | [diff] [blame] | 3614 | context->shadow_root_level = kvm_x86_ops->get_tdp_level(); |
Joerg Roedel | fb72d16 | 2008-02-07 13:47:44 +0100 | [diff] [blame] | 3615 | context->root_hpa = INVALID_PAGE; |
Joerg Roedel | c5a78f2b | 2010-09-10 17:30:39 +0200 | [diff] [blame] | 3616 | context->direct_map = true; |
Joerg Roedel | 1c97f0a | 2010-09-10 17:30:41 +0200 | [diff] [blame] | 3617 | context->set_cr3 = kvm_x86_ops->set_tdp_cr3; |
Joerg Roedel | 5777ed3 | 2010-09-10 17:30:42 +0200 | [diff] [blame] | 3618 | context->get_cr3 = get_cr3; |
Avi Kivity | e4e517b | 2011-07-28 11:36:17 +0300 | [diff] [blame] | 3619 | context->get_pdptr = kvm_pdptr_read; |
Joerg Roedel | cb659db | 2010-09-10 17:30:43 +0200 | [diff] [blame] | 3620 | context->inject_page_fault = kvm_inject_page_fault; |
Joerg Roedel | fb72d16 | 2008-02-07 13:47:44 +0100 | [diff] [blame] | 3621 | |
| 3622 | if (!is_paging(vcpu)) { |
Joerg Roedel | 2d48a98 | 2010-09-10 17:31:01 +0200 | [diff] [blame] | 3623 | context->nx = false; |
Joerg Roedel | fb72d16 | 2008-02-07 13:47:44 +0100 | [diff] [blame] | 3624 | context->gva_to_gpa = nonpaging_gva_to_gpa; |
| 3625 | context->root_level = 0; |
| 3626 | } else if (is_long_mode(vcpu)) { |
Joerg Roedel | 2d48a98 | 2010-09-10 17:31:01 +0200 | [diff] [blame] | 3627 | context->nx = is_nx(vcpu); |
Joerg Roedel | fb72d16 | 2008-02-07 13:47:44 +0100 | [diff] [blame] | 3628 | context->root_level = PT64_ROOT_LEVEL; |
Davidlohr Bueso | 4d6931c | 2012-03-05 16:53:06 +0100 | [diff] [blame] | 3629 | reset_rsvds_bits_mask(vcpu, context); |
| 3630 | context->gva_to_gpa = paging64_gva_to_gpa; |
Joerg Roedel | fb72d16 | 2008-02-07 13:47:44 +0100 | [diff] [blame] | 3631 | } else if (is_pae(vcpu)) { |
Joerg Roedel | 2d48a98 | 2010-09-10 17:31:01 +0200 | [diff] [blame] | 3632 | context->nx = is_nx(vcpu); |
Joerg Roedel | fb72d16 | 2008-02-07 13:47:44 +0100 | [diff] [blame] | 3633 | context->root_level = PT32E_ROOT_LEVEL; |
Davidlohr Bueso | 4d6931c | 2012-03-05 16:53:06 +0100 | [diff] [blame] | 3634 | reset_rsvds_bits_mask(vcpu, context); |
| 3635 | context->gva_to_gpa = paging64_gva_to_gpa; |
Joerg Roedel | fb72d16 | 2008-02-07 13:47:44 +0100 | [diff] [blame] | 3636 | } else { |
Joerg Roedel | 2d48a98 | 2010-09-10 17:31:01 +0200 | [diff] [blame] | 3637 | context->nx = false; |
Joerg Roedel | fb72d16 | 2008-02-07 13:47:44 +0100 | [diff] [blame] | 3638 | context->root_level = PT32_ROOT_LEVEL; |
Davidlohr Bueso | 4d6931c | 2012-03-05 16:53:06 +0100 | [diff] [blame] | 3639 | reset_rsvds_bits_mask(vcpu, context); |
| 3640 | context->gva_to_gpa = paging32_gva_to_gpa; |
Joerg Roedel | fb72d16 | 2008-02-07 13:47:44 +0100 | [diff] [blame] | 3641 | } |
| 3642 | |
Avi Kivity | 97d64b7 | 2012-09-12 14:52:00 +0300 | [diff] [blame] | 3643 | update_permission_bitmask(vcpu, context); |
Avi Kivity | 6fd01b7 | 2012-09-12 20:46:56 +0300 | [diff] [blame] | 3644 | update_last_pte_bitmap(vcpu, context); |
Avi Kivity | 97d64b7 | 2012-09-12 14:52:00 +0300 | [diff] [blame] | 3645 | |
Joerg Roedel | fb72d16 | 2008-02-07 13:47:44 +0100 | [diff] [blame] | 3646 | return 0; |
| 3647 | } |
| 3648 | |
Joerg Roedel | 52fde8d | 2010-09-10 17:30:44 +0200 | [diff] [blame] | 3649 | int kvm_init_shadow_mmu(struct kvm_vcpu *vcpu, struct kvm_mmu *context) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3650 | { |
Avi Kivity | a770f6f | 2008-12-21 19:20:09 +0200 | [diff] [blame] | 3651 | int r; |
Avi Kivity | 411c588 | 2011-06-06 16:11:54 +0300 | [diff] [blame] | 3652 | bool smep = kvm_read_cr4_bits(vcpu, X86_CR4_SMEP); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3653 | ASSERT(vcpu); |
Zhang Xiantao | ad312c7 | 2007-12-13 23:50:52 +0800 | [diff] [blame] | 3654 | ASSERT(!VALID_PAGE(vcpu->arch.mmu.root_hpa)); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3655 | |
| 3656 | if (!is_paging(vcpu)) |
Joerg Roedel | 52fde8d | 2010-09-10 17:30:44 +0200 | [diff] [blame] | 3657 | r = nonpaging_init_context(vcpu, context); |
Avi Kivity | a9058ec | 2006-12-29 16:49:37 -0800 | [diff] [blame] | 3658 | else if (is_long_mode(vcpu)) |
Joerg Roedel | 52fde8d | 2010-09-10 17:30:44 +0200 | [diff] [blame] | 3659 | r = paging64_init_context(vcpu, context); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3660 | else if (is_pae(vcpu)) |
Joerg Roedel | 52fde8d | 2010-09-10 17:30:44 +0200 | [diff] [blame] | 3661 | r = paging32E_init_context(vcpu, context); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3662 | else |
Joerg Roedel | 52fde8d | 2010-09-10 17:30:44 +0200 | [diff] [blame] | 3663 | r = paging32_init_context(vcpu, context); |
Avi Kivity | a770f6f | 2008-12-21 19:20:09 +0200 | [diff] [blame] | 3664 | |
Gleb Natapov | 2c9afa5 | 2013-01-30 16:45:02 +0200 | [diff] [blame] | 3665 | vcpu->arch.mmu.base_role.nxe = is_nx(vcpu); |
Avi Kivity | 5b7e010 | 2010-04-14 19:20:03 +0300 | [diff] [blame] | 3666 | vcpu->arch.mmu.base_role.cr4_pae = !!is_pae(vcpu); |
Joerg Roedel | f43addd | 2010-09-10 17:30:40 +0200 | [diff] [blame] | 3667 | vcpu->arch.mmu.base_role.cr0_wp = is_write_protection(vcpu); |
Avi Kivity | 411c588 | 2011-06-06 16:11:54 +0300 | [diff] [blame] | 3668 | vcpu->arch.mmu.base_role.smep_andnot_wp |
| 3669 | = smep && !is_write_protection(vcpu); |
Joerg Roedel | 52fde8d | 2010-09-10 17:30:44 +0200 | [diff] [blame] | 3670 | |
| 3671 | return r; |
| 3672 | } |
| 3673 | EXPORT_SYMBOL_GPL(kvm_init_shadow_mmu); |
| 3674 | |
| 3675 | static int init_kvm_softmmu(struct kvm_vcpu *vcpu) |
| 3676 | { |
Joerg Roedel | 14dfe85 | 2010-09-10 17:30:49 +0200 | [diff] [blame] | 3677 | int r = kvm_init_shadow_mmu(vcpu, vcpu->arch.walk_mmu); |
Joerg Roedel | 52fde8d | 2010-09-10 17:30:44 +0200 | [diff] [blame] | 3678 | |
Joerg Roedel | 14dfe85 | 2010-09-10 17:30:49 +0200 | [diff] [blame] | 3679 | vcpu->arch.walk_mmu->set_cr3 = kvm_x86_ops->set_cr3; |
| 3680 | vcpu->arch.walk_mmu->get_cr3 = get_cr3; |
Avi Kivity | e4e517b | 2011-07-28 11:36:17 +0300 | [diff] [blame] | 3681 | vcpu->arch.walk_mmu->get_pdptr = kvm_pdptr_read; |
Joerg Roedel | 14dfe85 | 2010-09-10 17:30:49 +0200 | [diff] [blame] | 3682 | vcpu->arch.walk_mmu->inject_page_fault = kvm_inject_page_fault; |
Avi Kivity | a770f6f | 2008-12-21 19:20:09 +0200 | [diff] [blame] | 3683 | |
| 3684 | return r; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3685 | } |
| 3686 | |
Joerg Roedel | 02f59dc | 2010-09-10 17:30:54 +0200 | [diff] [blame] | 3687 | static int init_kvm_nested_mmu(struct kvm_vcpu *vcpu) |
| 3688 | { |
| 3689 | struct kvm_mmu *g_context = &vcpu->arch.nested_mmu; |
| 3690 | |
| 3691 | g_context->get_cr3 = get_cr3; |
Avi Kivity | e4e517b | 2011-07-28 11:36:17 +0300 | [diff] [blame] | 3692 | g_context->get_pdptr = kvm_pdptr_read; |
Joerg Roedel | 02f59dc | 2010-09-10 17:30:54 +0200 | [diff] [blame] | 3693 | g_context->inject_page_fault = kvm_inject_page_fault; |
| 3694 | |
| 3695 | /* |
| 3696 | * Note that arch.mmu.gva_to_gpa translates l2_gva to l1_gpa. The |
| 3697 | * translation of l2_gpa to l1_gpa addresses is done using the |
| 3698 | * arch.nested_mmu.gva_to_gpa function. Basically the gva_to_gpa |
| 3699 | * functions between mmu and nested_mmu are swapped. |
| 3700 | */ |
| 3701 | if (!is_paging(vcpu)) { |
Joerg Roedel | 2d48a98 | 2010-09-10 17:31:01 +0200 | [diff] [blame] | 3702 | g_context->nx = false; |
Joerg Roedel | 02f59dc | 2010-09-10 17:30:54 +0200 | [diff] [blame] | 3703 | g_context->root_level = 0; |
| 3704 | g_context->gva_to_gpa = nonpaging_gva_to_gpa_nested; |
| 3705 | } else if (is_long_mode(vcpu)) { |
Joerg Roedel | 2d48a98 | 2010-09-10 17:31:01 +0200 | [diff] [blame] | 3706 | g_context->nx = is_nx(vcpu); |
Joerg Roedel | 02f59dc | 2010-09-10 17:30:54 +0200 | [diff] [blame] | 3707 | g_context->root_level = PT64_ROOT_LEVEL; |
Davidlohr Bueso | 4d6931c | 2012-03-05 16:53:06 +0100 | [diff] [blame] | 3708 | reset_rsvds_bits_mask(vcpu, g_context); |
Joerg Roedel | 02f59dc | 2010-09-10 17:30:54 +0200 | [diff] [blame] | 3709 | g_context->gva_to_gpa = paging64_gva_to_gpa_nested; |
| 3710 | } else if (is_pae(vcpu)) { |
Joerg Roedel | 2d48a98 | 2010-09-10 17:31:01 +0200 | [diff] [blame] | 3711 | g_context->nx = is_nx(vcpu); |
Joerg Roedel | 02f59dc | 2010-09-10 17:30:54 +0200 | [diff] [blame] | 3712 | g_context->root_level = PT32E_ROOT_LEVEL; |
Davidlohr Bueso | 4d6931c | 2012-03-05 16:53:06 +0100 | [diff] [blame] | 3713 | reset_rsvds_bits_mask(vcpu, g_context); |
Joerg Roedel | 02f59dc | 2010-09-10 17:30:54 +0200 | [diff] [blame] | 3714 | g_context->gva_to_gpa = paging64_gva_to_gpa_nested; |
| 3715 | } else { |
Joerg Roedel | 2d48a98 | 2010-09-10 17:31:01 +0200 | [diff] [blame] | 3716 | g_context->nx = false; |
Joerg Roedel | 02f59dc | 2010-09-10 17:30:54 +0200 | [diff] [blame] | 3717 | g_context->root_level = PT32_ROOT_LEVEL; |
Davidlohr Bueso | 4d6931c | 2012-03-05 16:53:06 +0100 | [diff] [blame] | 3718 | reset_rsvds_bits_mask(vcpu, g_context); |
Joerg Roedel | 02f59dc | 2010-09-10 17:30:54 +0200 | [diff] [blame] | 3719 | g_context->gva_to_gpa = paging32_gva_to_gpa_nested; |
| 3720 | } |
| 3721 | |
Avi Kivity | 97d64b7 | 2012-09-12 14:52:00 +0300 | [diff] [blame] | 3722 | update_permission_bitmask(vcpu, g_context); |
Avi Kivity | 6fd01b7 | 2012-09-12 20:46:56 +0300 | [diff] [blame] | 3723 | update_last_pte_bitmap(vcpu, g_context); |
Avi Kivity | 97d64b7 | 2012-09-12 14:52:00 +0300 | [diff] [blame] | 3724 | |
Joerg Roedel | 02f59dc | 2010-09-10 17:30:54 +0200 | [diff] [blame] | 3725 | return 0; |
| 3726 | } |
| 3727 | |
Joerg Roedel | fb72d16 | 2008-02-07 13:47:44 +0100 | [diff] [blame] | 3728 | static int init_kvm_mmu(struct kvm_vcpu *vcpu) |
| 3729 | { |
Joerg Roedel | 02f59dc | 2010-09-10 17:30:54 +0200 | [diff] [blame] | 3730 | if (mmu_is_nested(vcpu)) |
| 3731 | return init_kvm_nested_mmu(vcpu); |
| 3732 | else if (tdp_enabled) |
Joerg Roedel | fb72d16 | 2008-02-07 13:47:44 +0100 | [diff] [blame] | 3733 | return init_kvm_tdp_mmu(vcpu); |
| 3734 | else |
| 3735 | return init_kvm_softmmu(vcpu); |
| 3736 | } |
| 3737 | |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3738 | static void destroy_kvm_mmu(struct kvm_vcpu *vcpu) |
| 3739 | { |
| 3740 | ASSERT(vcpu); |
Sheng Yang | 62ad075 | 2010-05-12 16:40:41 +0800 | [diff] [blame] | 3741 | if (VALID_PAGE(vcpu->arch.mmu.root_hpa)) |
| 3742 | /* mmu.free() should set root_hpa = INVALID_PAGE */ |
Zhang Xiantao | ad312c7 | 2007-12-13 23:50:52 +0800 | [diff] [blame] | 3743 | vcpu->arch.mmu.free(vcpu); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3744 | } |
| 3745 | |
| 3746 | int kvm_mmu_reset_context(struct kvm_vcpu *vcpu) |
| 3747 | { |
Avi Kivity | 17c3ba9 | 2007-06-04 15:58:30 +0300 | [diff] [blame] | 3748 | destroy_kvm_mmu(vcpu); |
Marcelo Tosatti | f8f7e5e | 2011-06-21 14:00:10 -0300 | [diff] [blame] | 3749 | return init_kvm_mmu(vcpu); |
Avi Kivity | 17c3ba9 | 2007-06-04 15:58:30 +0300 | [diff] [blame] | 3750 | } |
Eddie Dong | 8668a3c | 2007-10-10 14:26:45 +0800 | [diff] [blame] | 3751 | EXPORT_SYMBOL_GPL(kvm_mmu_reset_context); |
Avi Kivity | 17c3ba9 | 2007-06-04 15:58:30 +0300 | [diff] [blame] | 3752 | |
| 3753 | int kvm_mmu_load(struct kvm_vcpu *vcpu) |
| 3754 | { |
Avi Kivity | 714b93d | 2007-01-05 16:36:53 -0800 | [diff] [blame] | 3755 | int r; |
| 3756 | |
Avi Kivity | e2dec93 | 2007-01-05 16:36:54 -0800 | [diff] [blame] | 3757 | r = mmu_topup_memory_caches(vcpu); |
Avi Kivity | 17c3ba9 | 2007-06-04 15:58:30 +0300 | [diff] [blame] | 3758 | if (r) |
| 3759 | goto out; |
Marcelo Tosatti | 8986ecc | 2009-05-12 18:55:45 -0300 | [diff] [blame] | 3760 | r = mmu_alloc_roots(vcpu); |
Avi Kivity | 8facbbf | 2010-05-04 12:58:32 +0300 | [diff] [blame] | 3761 | spin_lock(&vcpu->kvm->mmu_lock); |
Marcelo Tosatti | 0ba73cd | 2008-09-23 13:18:34 -0300 | [diff] [blame] | 3762 | mmu_sync_roots(vcpu); |
Marcelo Tosatti | aaee2c9 | 2007-12-20 19:18:26 -0500 | [diff] [blame] | 3763 | spin_unlock(&vcpu->kvm->mmu_lock); |
Marcelo Tosatti | 8986ecc | 2009-05-12 18:55:45 -0300 | [diff] [blame] | 3764 | if (r) |
| 3765 | goto out; |
Sheng Yang | 3662cb1 | 2009-07-09 17:00:42 +0800 | [diff] [blame] | 3766 | /* set_cr3() should ensure TLB has been flushed */ |
Joerg Roedel | f43addd | 2010-09-10 17:30:40 +0200 | [diff] [blame] | 3767 | vcpu->arch.mmu.set_cr3(vcpu, vcpu->arch.mmu.root_hpa); |
Avi Kivity | 714b93d | 2007-01-05 16:36:53 -0800 | [diff] [blame] | 3768 | out: |
| 3769 | return r; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3770 | } |
Avi Kivity | 17c3ba9 | 2007-06-04 15:58:30 +0300 | [diff] [blame] | 3771 | EXPORT_SYMBOL_GPL(kvm_mmu_load); |
| 3772 | |
| 3773 | void kvm_mmu_unload(struct kvm_vcpu *vcpu) |
| 3774 | { |
| 3775 | mmu_free_roots(vcpu); |
| 3776 | } |
Joerg Roedel | 4b16184 | 2010-09-10 17:31:03 +0200 | [diff] [blame] | 3777 | EXPORT_SYMBOL_GPL(kvm_mmu_unload); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3778 | |
Avi Kivity | 0028425 | 2007-05-01 16:53:31 +0300 | [diff] [blame] | 3779 | static void mmu_pte_write_new_pte(struct kvm_vcpu *vcpu, |
Xiao Guangrong | 7c56252 | 2011-03-28 10:29:27 +0800 | [diff] [blame] | 3780 | struct kvm_mmu_page *sp, u64 *spte, |
| 3781 | const void *new) |
Avi Kivity | 0028425 | 2007-05-01 16:53:31 +0300 | [diff] [blame] | 3782 | { |
Marcelo Tosatti | 3094538 | 2008-06-11 20:32:40 -0300 | [diff] [blame] | 3783 | if (sp->role.level != PT_PAGE_TABLE_LEVEL) { |
Joerg Roedel | 7e4e405 | 2009-07-27 16:30:46 +0200 | [diff] [blame] | 3784 | ++vcpu->kvm->stat.mmu_pde_zapped; |
| 3785 | return; |
Marcelo Tosatti | 3094538 | 2008-06-11 20:32:40 -0300 | [diff] [blame] | 3786 | } |
Avi Kivity | 0028425 | 2007-05-01 16:53:31 +0300 | [diff] [blame] | 3787 | |
Avi Kivity | 4cee576 | 2007-11-18 16:37:07 +0200 | [diff] [blame] | 3788 | ++vcpu->kvm->stat.mmu_pte_updated; |
Xiao Guangrong | 7c56252 | 2011-03-28 10:29:27 +0800 | [diff] [blame] | 3789 | vcpu->arch.mmu.update_pte(vcpu, sp, spte, new); |
Avi Kivity | 0028425 | 2007-05-01 16:53:31 +0300 | [diff] [blame] | 3790 | } |
| 3791 | |
Avi Kivity | 79539ce | 2007-11-21 02:06:21 +0200 | [diff] [blame] | 3792 | static bool need_remote_flush(u64 old, u64 new) |
| 3793 | { |
| 3794 | if (!is_shadow_present_pte(old)) |
| 3795 | return false; |
| 3796 | if (!is_shadow_present_pte(new)) |
| 3797 | return true; |
| 3798 | if ((old ^ new) & PT64_BASE_ADDR_MASK) |
| 3799 | return true; |
| 3800 | old ^= PT64_NX_MASK; |
| 3801 | new ^= PT64_NX_MASK; |
| 3802 | return (old & ~new & PT64_PERM_MASK) != 0; |
| 3803 | } |
| 3804 | |
Xiao Guangrong | 0671a8e | 2010-06-04 21:56:59 +0800 | [diff] [blame] | 3805 | static void mmu_pte_write_flush_tlb(struct kvm_vcpu *vcpu, bool zap_page, |
| 3806 | bool remote_flush, bool local_flush) |
Avi Kivity | 79539ce | 2007-11-21 02:06:21 +0200 | [diff] [blame] | 3807 | { |
Xiao Guangrong | 0671a8e | 2010-06-04 21:56:59 +0800 | [diff] [blame] | 3808 | if (zap_page) |
| 3809 | return; |
| 3810 | |
| 3811 | if (remote_flush) |
Avi Kivity | 79539ce | 2007-11-21 02:06:21 +0200 | [diff] [blame] | 3812 | kvm_flush_remote_tlbs(vcpu->kvm); |
Xiao Guangrong | 0671a8e | 2010-06-04 21:56:59 +0800 | [diff] [blame] | 3813 | else if (local_flush) |
Avi Kivity | 79539ce | 2007-11-21 02:06:21 +0200 | [diff] [blame] | 3814 | kvm_mmu_flush_tlb(vcpu); |
| 3815 | } |
| 3816 | |
Xiao Guangrong | 889e5cb | 2011-09-22 16:57:23 +0800 | [diff] [blame] | 3817 | static u64 mmu_pte_write_fetch_gpte(struct kvm_vcpu *vcpu, gpa_t *gpa, |
| 3818 | const u8 *new, int *bytes) |
Avi Kivity | da4a00f | 2007-01-05 16:36:44 -0800 | [diff] [blame] | 3819 | { |
Xiao Guangrong | 889e5cb | 2011-09-22 16:57:23 +0800 | [diff] [blame] | 3820 | u64 gentry; |
| 3821 | int r; |
Avi Kivity | 72016f3 | 2010-03-15 13:59:53 +0200 | [diff] [blame] | 3822 | |
Avi Kivity | 08e850c | 2010-03-15 13:59:57 +0200 | [diff] [blame] | 3823 | /* |
| 3824 | * 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] | 3825 | * as the current vcpu paging mode since we update the sptes only |
| 3826 | * when they have the same mode. |
Avi Kivity | 08e850c | 2010-03-15 13:59:57 +0200 | [diff] [blame] | 3827 | */ |
Xiao Guangrong | 889e5cb | 2011-09-22 16:57:23 +0800 | [diff] [blame] | 3828 | if (is_pae(vcpu) && *bytes == 4) { |
Avi Kivity | 08e850c | 2010-03-15 13:59:57 +0200 | [diff] [blame] | 3829 | /* 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] | 3830 | *gpa &= ~(gpa_t)7; |
| 3831 | *bytes = 8; |
Gleb Natapov | 116eb3d | 2013-01-30 16:45:03 +0200 | [diff] [blame] | 3832 | r = kvm_read_guest(vcpu->kvm, *gpa, &gentry, 8); |
Avi Kivity | 08e850c | 2010-03-15 13:59:57 +0200 | [diff] [blame] | 3833 | if (r) |
| 3834 | gentry = 0; |
| 3835 | new = (const u8 *)&gentry; |
| 3836 | } |
| 3837 | |
Xiao Guangrong | 889e5cb | 2011-09-22 16:57:23 +0800 | [diff] [blame] | 3838 | switch (*bytes) { |
Avi Kivity | 72016f3 | 2010-03-15 13:59:53 +0200 | [diff] [blame] | 3839 | case 4: |
| 3840 | gentry = *(const u32 *)new; |
| 3841 | break; |
| 3842 | case 8: |
| 3843 | gentry = *(const u64 *)new; |
| 3844 | break; |
| 3845 | default: |
| 3846 | gentry = 0; |
| 3847 | break; |
| 3848 | } |
| 3849 | |
Xiao Guangrong | 889e5cb | 2011-09-22 16:57:23 +0800 | [diff] [blame] | 3850 | return gentry; |
| 3851 | } |
| 3852 | |
| 3853 | /* |
| 3854 | * If we're seeing too many writes to a page, it may no longer be a page table, |
| 3855 | * or we may be forking, in which case it is better to unmap the page. |
| 3856 | */ |
Xiao Guangrong | a138fe7 | 2011-12-16 18:18:10 +0800 | [diff] [blame] | 3857 | static bool detect_write_flooding(struct kvm_mmu_page *sp) |
Xiao Guangrong | 889e5cb | 2011-09-22 16:57:23 +0800 | [diff] [blame] | 3858 | { |
Xiao Guangrong | a30f47c | 2011-09-22 16:58:36 +0800 | [diff] [blame] | 3859 | /* |
| 3860 | * Skip write-flooding detected for the sp whose level is 1, because |
| 3861 | * it can become unsync, then the guest page is not write-protected. |
| 3862 | */ |
Davidlohr Bueso | f71fa31 | 2012-04-18 12:24:29 +0200 | [diff] [blame] | 3863 | if (sp->role.level == PT_PAGE_TABLE_LEVEL) |
Xiao Guangrong | a30f47c | 2011-09-22 16:58:36 +0800 | [diff] [blame] | 3864 | return false; |
Xiao Guangrong | 889e5cb | 2011-09-22 16:57:23 +0800 | [diff] [blame] | 3865 | |
Xiao Guangrong | a30f47c | 2011-09-22 16:58:36 +0800 | [diff] [blame] | 3866 | return ++sp->write_flooding_count >= 3; |
Xiao Guangrong | 889e5cb | 2011-09-22 16:57:23 +0800 | [diff] [blame] | 3867 | } |
| 3868 | |
| 3869 | /* |
| 3870 | * Misaligned accesses are too much trouble to fix up; also, they usually |
| 3871 | * indicate a page is not used as a page table. |
| 3872 | */ |
| 3873 | static bool detect_write_misaligned(struct kvm_mmu_page *sp, gpa_t gpa, |
| 3874 | int bytes) |
| 3875 | { |
| 3876 | unsigned offset, pte_size, misaligned; |
| 3877 | |
| 3878 | pgprintk("misaligned: gpa %llx bytes %d role %x\n", |
| 3879 | gpa, bytes, sp->role.word); |
| 3880 | |
| 3881 | offset = offset_in_page(gpa); |
| 3882 | pte_size = sp->role.cr4_pae ? 8 : 4; |
Xiao Guangrong | 5d9ca30 | 2011-09-22 16:57:55 +0800 | [diff] [blame] | 3883 | |
| 3884 | /* |
| 3885 | * Sometimes, the OS only writes the last one bytes to update status |
| 3886 | * bits, for example, in linux, andb instruction is used in clear_bit(). |
| 3887 | */ |
| 3888 | if (!(offset & (pte_size - 1)) && bytes == 1) |
| 3889 | return false; |
| 3890 | |
Xiao Guangrong | 889e5cb | 2011-09-22 16:57:23 +0800 | [diff] [blame] | 3891 | misaligned = (offset ^ (offset + bytes - 1)) & ~(pte_size - 1); |
| 3892 | misaligned |= bytes < 4; |
| 3893 | |
| 3894 | return misaligned; |
| 3895 | } |
| 3896 | |
| 3897 | static u64 *get_written_sptes(struct kvm_mmu_page *sp, gpa_t gpa, int *nspte) |
| 3898 | { |
| 3899 | unsigned page_offset, quadrant; |
| 3900 | u64 *spte; |
| 3901 | int level; |
| 3902 | |
| 3903 | page_offset = offset_in_page(gpa); |
| 3904 | level = sp->role.level; |
| 3905 | *nspte = 1; |
| 3906 | if (!sp->role.cr4_pae) { |
| 3907 | page_offset <<= 1; /* 32->64 */ |
| 3908 | /* |
| 3909 | * A 32-bit pde maps 4MB while the shadow pdes map |
| 3910 | * only 2MB. So we need to double the offset again |
| 3911 | * and zap two pdes instead of one. |
| 3912 | */ |
| 3913 | if (level == PT32_ROOT_LEVEL) { |
| 3914 | page_offset &= ~7; /* kill rounding error */ |
| 3915 | page_offset <<= 1; |
| 3916 | *nspte = 2; |
| 3917 | } |
| 3918 | quadrant = page_offset >> PAGE_SHIFT; |
| 3919 | page_offset &= ~PAGE_MASK; |
| 3920 | if (quadrant != sp->role.quadrant) |
| 3921 | return NULL; |
| 3922 | } |
| 3923 | |
| 3924 | spte = &sp->spt[page_offset / sizeof(*spte)]; |
| 3925 | return spte; |
| 3926 | } |
| 3927 | |
| 3928 | void kvm_mmu_pte_write(struct kvm_vcpu *vcpu, gpa_t gpa, |
| 3929 | const u8 *new, int bytes) |
| 3930 | { |
| 3931 | gfn_t gfn = gpa >> PAGE_SHIFT; |
| 3932 | union kvm_mmu_page_role mask = { .word = 0 }; |
| 3933 | struct kvm_mmu_page *sp; |
| 3934 | struct hlist_node *node; |
| 3935 | LIST_HEAD(invalid_list); |
| 3936 | u64 entry, gentry, *spte; |
| 3937 | int npte; |
Xiao Guangrong | a30f47c | 2011-09-22 16:58:36 +0800 | [diff] [blame] | 3938 | bool remote_flush, local_flush, zap_page; |
Xiao Guangrong | 889e5cb | 2011-09-22 16:57:23 +0800 | [diff] [blame] | 3939 | |
| 3940 | /* |
| 3941 | * If we don't have indirect shadow pages, it means no page is |
| 3942 | * write-protected, so we can exit simply. |
| 3943 | */ |
| 3944 | if (!ACCESS_ONCE(vcpu->kvm->arch.indirect_shadow_pages)) |
| 3945 | return; |
| 3946 | |
| 3947 | zap_page = remote_flush = local_flush = false; |
| 3948 | |
| 3949 | pgprintk("%s: gpa %llx bytes %d\n", __func__, gpa, bytes); |
| 3950 | |
| 3951 | gentry = mmu_pte_write_fetch_gpte(vcpu, &gpa, new, &bytes); |
| 3952 | |
| 3953 | /* |
| 3954 | * No need to care whether allocation memory is successful |
| 3955 | * or not since pte prefetch is skiped if it does not have |
| 3956 | * enough objects in the cache. |
| 3957 | */ |
| 3958 | mmu_topup_memory_caches(vcpu); |
| 3959 | |
| 3960 | spin_lock(&vcpu->kvm->mmu_lock); |
| 3961 | ++vcpu->kvm->stat.mmu_pte_write; |
Xiao Guangrong | 0375f7f | 2011-11-28 20:41:00 +0800 | [diff] [blame] | 3962 | kvm_mmu_audit(vcpu, AUDIT_PRE_PTE_WRITE); |
Xiao Guangrong | 889e5cb | 2011-09-22 16:57:23 +0800 | [diff] [blame] | 3963 | |
Xiao Guangrong | fa1de2b | 2010-07-16 11:19:51 +0800 | [diff] [blame] | 3964 | mask.cr0_wp = mask.cr4_pae = mask.nxe = 1; |
Xiao Guangrong | f41d335 | 2010-06-04 21:56:11 +0800 | [diff] [blame] | 3965 | for_each_gfn_indirect_valid_sp(vcpu->kvm, sp, gfn, node) { |
Xiao Guangrong | a30f47c | 2011-09-22 16:58:36 +0800 | [diff] [blame] | 3966 | if (detect_write_misaligned(sp, gpa, bytes) || |
Xiao Guangrong | a138fe7 | 2011-12-16 18:18:10 +0800 | [diff] [blame] | 3967 | detect_write_flooding(sp)) { |
Xiao Guangrong | 0671a8e | 2010-06-04 21:56:59 +0800 | [diff] [blame] | 3968 | zap_page |= !!kvm_mmu_prepare_zap_page(vcpu->kvm, sp, |
Xiao Guangrong | f41d335 | 2010-06-04 21:56:11 +0800 | [diff] [blame] | 3969 | &invalid_list); |
Avi Kivity | 4cee576 | 2007-11-18 16:37:07 +0200 | [diff] [blame] | 3970 | ++vcpu->kvm->stat.mmu_flooded; |
Avi Kivity | 0e7bc4b | 2007-01-05 16:36:48 -0800 | [diff] [blame] | 3971 | continue; |
| 3972 | } |
Xiao Guangrong | 889e5cb | 2011-09-22 16:57:23 +0800 | [diff] [blame] | 3973 | |
| 3974 | spte = get_written_sptes(sp, gpa, &npte); |
| 3975 | if (!spte) |
| 3976 | continue; |
| 3977 | |
Xiao Guangrong | 0671a8e | 2010-06-04 21:56:59 +0800 | [diff] [blame] | 3978 | local_flush = true; |
Avi Kivity | ac1b714 | 2007-03-08 17:13:32 +0200 | [diff] [blame] | 3979 | while (npte--) { |
Avi Kivity | 79539ce | 2007-11-21 02:06:21 +0200 | [diff] [blame] | 3980 | entry = *spte; |
Xiao Guangrong | 38e3b2b | 2011-05-15 23:27:52 +0800 | [diff] [blame] | 3981 | mmu_page_zap_pte(vcpu->kvm, sp, spte); |
Xiao Guangrong | fa1de2b | 2010-07-16 11:19:51 +0800 | [diff] [blame] | 3982 | if (gentry && |
| 3983 | !((sp->role.word ^ vcpu->arch.mmu.base_role.word) |
Xiao Guangrong | f759e2b | 2011-09-22 16:53:17 +0800 | [diff] [blame] | 3984 | & mask.word) && rmap_can_add(vcpu)) |
Xiao Guangrong | 7c56252 | 2011-03-28 10:29:27 +0800 | [diff] [blame] | 3985 | mmu_pte_write_new_pte(vcpu, sp, spte, &gentry); |
Gleb Natapov | 9bb4f6b | 2013-01-30 16:45:01 +0200 | [diff] [blame] | 3986 | if (need_remote_flush(entry, *spte)) |
Xiao Guangrong | 0671a8e | 2010-06-04 21:56:59 +0800 | [diff] [blame] | 3987 | remote_flush = true; |
Avi Kivity | ac1b714 | 2007-03-08 17:13:32 +0200 | [diff] [blame] | 3988 | ++spte; |
Avi Kivity | 9b7a032 | 2007-01-05 16:36:45 -0800 | [diff] [blame] | 3989 | } |
Avi Kivity | 9b7a032 | 2007-01-05 16:36:45 -0800 | [diff] [blame] | 3990 | } |
Xiao Guangrong | 0671a8e | 2010-06-04 21:56:59 +0800 | [diff] [blame] | 3991 | mmu_pte_write_flush_tlb(vcpu, zap_page, remote_flush, local_flush); |
Xiao Guangrong | d98ba05 | 2010-06-04 21:55:29 +0800 | [diff] [blame] | 3992 | kvm_mmu_commit_zap_page(vcpu->kvm, &invalid_list); |
Xiao Guangrong | 0375f7f | 2011-11-28 20:41:00 +0800 | [diff] [blame] | 3993 | kvm_mmu_audit(vcpu, AUDIT_POST_PTE_WRITE); |
Marcelo Tosatti | aaee2c9 | 2007-12-20 19:18:26 -0500 | [diff] [blame] | 3994 | spin_unlock(&vcpu->kvm->mmu_lock); |
Avi Kivity | da4a00f | 2007-01-05 16:36:44 -0800 | [diff] [blame] | 3995 | } |
| 3996 | |
Avi Kivity | a436036 | 2007-01-05 16:36:45 -0800 | [diff] [blame] | 3997 | int kvm_mmu_unprotect_page_virt(struct kvm_vcpu *vcpu, gva_t gva) |
| 3998 | { |
Marcelo Tosatti | 10589a4 | 2007-12-20 19:18:22 -0500 | [diff] [blame] | 3999 | gpa_t gpa; |
| 4000 | int r; |
Avi Kivity | a436036 | 2007-01-05 16:36:45 -0800 | [diff] [blame] | 4001 | |
Joerg Roedel | c5a78f2b | 2010-09-10 17:30:39 +0200 | [diff] [blame] | 4002 | if (vcpu->arch.mmu.direct_map) |
Avi Kivity | 60f2478 | 2009-08-27 13:37:06 +0300 | [diff] [blame] | 4003 | return 0; |
| 4004 | |
Gleb Natapov | 1871c60 | 2010-02-10 14:21:32 +0200 | [diff] [blame] | 4005 | gpa = kvm_mmu_gva_to_gpa_read(vcpu, gva, NULL); |
Marcelo Tosatti | 10589a4 | 2007-12-20 19:18:22 -0500 | [diff] [blame] | 4006 | |
Marcelo Tosatti | 10589a4 | 2007-12-20 19:18:22 -0500 | [diff] [blame] | 4007 | r = kvm_mmu_unprotect_page(vcpu->kvm, gpa >> PAGE_SHIFT); |
Xiao Guangrong | 1cb3f3a | 2011-09-22 17:02:48 +0800 | [diff] [blame] | 4008 | |
Marcelo Tosatti | 10589a4 | 2007-12-20 19:18:22 -0500 | [diff] [blame] | 4009 | return r; |
Avi Kivity | a436036 | 2007-01-05 16:36:45 -0800 | [diff] [blame] | 4010 | } |
Avi Kivity | 577bdc4 | 2008-07-19 08:57:05 +0300 | [diff] [blame] | 4011 | EXPORT_SYMBOL_GPL(kvm_mmu_unprotect_page_virt); |
Avi Kivity | a436036 | 2007-01-05 16:36:45 -0800 | [diff] [blame] | 4012 | |
Avi Kivity | 22d95b1 | 2007-09-14 20:26:06 +0300 | [diff] [blame] | 4013 | void __kvm_mmu_free_some_pages(struct kvm_vcpu *vcpu) |
Avi Kivity | ebeace8 | 2007-01-05 16:36:47 -0800 | [diff] [blame] | 4014 | { |
Xiao Guangrong | d98ba05 | 2010-06-04 21:55:29 +0800 | [diff] [blame] | 4015 | LIST_HEAD(invalid_list); |
Xiao Guangrong | 103ad25 | 2010-06-04 21:54:38 +0800 | [diff] [blame] | 4016 | |
Dave Hansen | e0df7b9 | 2010-08-19 18:11:05 -0700 | [diff] [blame] | 4017 | while (kvm_mmu_available_pages(vcpu->kvm) < KVM_REFILL_PAGES && |
Izik Eidus | 3b80fff | 2009-07-28 15:26:58 -0300 | [diff] [blame] | 4018 | !list_empty(&vcpu->kvm->arch.active_mmu_pages)) { |
Avi Kivity | 4db3531 | 2007-11-21 15:28:32 +0200 | [diff] [blame] | 4019 | struct kvm_mmu_page *sp; |
Avi Kivity | ebeace8 | 2007-01-05 16:36:47 -0800 | [diff] [blame] | 4020 | |
Zhang Xiantao | f05e70a | 2007-12-14 10:01:48 +0800 | [diff] [blame] | 4021 | sp = container_of(vcpu->kvm->arch.active_mmu_pages.prev, |
Avi Kivity | 4db3531 | 2007-11-21 15:28:32 +0200 | [diff] [blame] | 4022 | struct kvm_mmu_page, link); |
Dave Hansen | e0df7b9 | 2010-08-19 18:11:05 -0700 | [diff] [blame] | 4023 | kvm_mmu_prepare_zap_page(vcpu->kvm, sp, &invalid_list); |
Avi Kivity | 4cee576 | 2007-11-18 16:37:07 +0200 | [diff] [blame] | 4024 | ++vcpu->kvm->stat.mmu_recycled; |
Avi Kivity | ebeace8 | 2007-01-05 16:36:47 -0800 | [diff] [blame] | 4025 | } |
Xiao Guangrong | aa6bd18 | 2011-07-12 03:26:40 +0800 | [diff] [blame] | 4026 | kvm_mmu_commit_zap_page(vcpu->kvm, &invalid_list); |
Avi Kivity | ebeace8 | 2007-01-05 16:36:47 -0800 | [diff] [blame] | 4027 | } |
Avi Kivity | ebeace8 | 2007-01-05 16:36:47 -0800 | [diff] [blame] | 4028 | |
Xiao Guangrong | 1cb3f3a | 2011-09-22 17:02:48 +0800 | [diff] [blame] | 4029 | static bool is_mmio_page_fault(struct kvm_vcpu *vcpu, gva_t addr) |
| 4030 | { |
| 4031 | if (vcpu->arch.mmu.direct_map || mmu_is_nested(vcpu)) |
| 4032 | return vcpu_match_mmio_gpa(vcpu, addr); |
| 4033 | |
| 4034 | return vcpu_match_mmio_gva(vcpu, addr); |
| 4035 | } |
| 4036 | |
Andre Przywara | dc25e89 | 2010-12-21 11:12:07 +0100 | [diff] [blame] | 4037 | int kvm_mmu_page_fault(struct kvm_vcpu *vcpu, gva_t cr2, u32 error_code, |
| 4038 | void *insn, int insn_len) |
Avi Kivity | 3067714 | 2007-10-28 18:48:59 +0200 | [diff] [blame] | 4039 | { |
Xiao Guangrong | 1cb3f3a | 2011-09-22 17:02:48 +0800 | [diff] [blame] | 4040 | int r, emulation_type = EMULTYPE_RETRY; |
Avi Kivity | 3067714 | 2007-10-28 18:48:59 +0200 | [diff] [blame] | 4041 | enum emulation_result er; |
| 4042 | |
Gleb Natapov | 56028d0 | 2010-10-17 18:13:42 +0200 | [diff] [blame] | 4043 | r = vcpu->arch.mmu.page_fault(vcpu, cr2, error_code, false); |
Avi Kivity | 3067714 | 2007-10-28 18:48:59 +0200 | [diff] [blame] | 4044 | if (r < 0) |
| 4045 | goto out; |
| 4046 | |
| 4047 | if (!r) { |
| 4048 | r = 1; |
| 4049 | goto out; |
| 4050 | } |
| 4051 | |
Xiao Guangrong | 1cb3f3a | 2011-09-22 17:02:48 +0800 | [diff] [blame] | 4052 | if (is_mmio_page_fault(vcpu, cr2)) |
| 4053 | emulation_type = 0; |
| 4054 | |
| 4055 | er = x86_emulate_instruction(vcpu, cr2, emulation_type, insn, insn_len); |
Avi Kivity | 3067714 | 2007-10-28 18:48:59 +0200 | [diff] [blame] | 4056 | |
| 4057 | switch (er) { |
| 4058 | case EMULATE_DONE: |
| 4059 | return 1; |
| 4060 | case EMULATE_DO_MMIO: |
| 4061 | ++vcpu->stat.mmio_exits; |
Gleb Natapov | 6d77dbf | 2010-05-10 11:16:56 +0300 | [diff] [blame] | 4062 | /* fall through */ |
Avi Kivity | 3067714 | 2007-10-28 18:48:59 +0200 | [diff] [blame] | 4063 | case EMULATE_FAIL: |
Avi Kivity | 3f5d18a | 2009-06-11 15:43:28 +0300 | [diff] [blame] | 4064 | return 0; |
Avi Kivity | 3067714 | 2007-10-28 18:48:59 +0200 | [diff] [blame] | 4065 | default: |
| 4066 | BUG(); |
| 4067 | } |
| 4068 | out: |
Avi Kivity | 3067714 | 2007-10-28 18:48:59 +0200 | [diff] [blame] | 4069 | return r; |
| 4070 | } |
| 4071 | EXPORT_SYMBOL_GPL(kvm_mmu_page_fault); |
| 4072 | |
Marcelo Tosatti | a705289 | 2008-09-23 13:18:35 -0300 | [diff] [blame] | 4073 | void kvm_mmu_invlpg(struct kvm_vcpu *vcpu, gva_t gva) |
| 4074 | { |
Marcelo Tosatti | a705289 | 2008-09-23 13:18:35 -0300 | [diff] [blame] | 4075 | vcpu->arch.mmu.invlpg(vcpu, gva); |
Marcelo Tosatti | a705289 | 2008-09-23 13:18:35 -0300 | [diff] [blame] | 4076 | kvm_mmu_flush_tlb(vcpu); |
| 4077 | ++vcpu->stat.invlpg; |
| 4078 | } |
| 4079 | EXPORT_SYMBOL_GPL(kvm_mmu_invlpg); |
| 4080 | |
Joerg Roedel | 1855267 | 2008-02-07 13:47:41 +0100 | [diff] [blame] | 4081 | void kvm_enable_tdp(void) |
| 4082 | { |
| 4083 | tdp_enabled = true; |
| 4084 | } |
| 4085 | EXPORT_SYMBOL_GPL(kvm_enable_tdp); |
| 4086 | |
Joerg Roedel | 5f4cb66 | 2008-07-14 20:36:36 +0200 | [diff] [blame] | 4087 | void kvm_disable_tdp(void) |
| 4088 | { |
| 4089 | tdp_enabled = false; |
| 4090 | } |
| 4091 | EXPORT_SYMBOL_GPL(kvm_disable_tdp); |
| 4092 | |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 4093 | static void free_mmu_pages(struct kvm_vcpu *vcpu) |
| 4094 | { |
Zhang Xiantao | ad312c7 | 2007-12-13 23:50:52 +0800 | [diff] [blame] | 4095 | free_page((unsigned long)vcpu->arch.mmu.pae_root); |
Joerg Roedel | 81407ca | 2010-09-10 17:31:00 +0200 | [diff] [blame] | 4096 | if (vcpu->arch.mmu.lm_root != NULL) |
| 4097 | free_page((unsigned long)vcpu->arch.mmu.lm_root); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 4098 | } |
| 4099 | |
| 4100 | static int alloc_mmu_pages(struct kvm_vcpu *vcpu) |
| 4101 | { |
Avi Kivity | 17ac10a | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 4102 | struct page *page; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 4103 | int i; |
| 4104 | |
| 4105 | ASSERT(vcpu); |
| 4106 | |
Avi Kivity | 17ac10a | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 4107 | /* |
| 4108 | * When emulating 32-bit mode, cr3 is only 32 bits even on x86_64. |
| 4109 | * Therefore we need to allocate shadow page tables in the first |
| 4110 | * 4GB of memory, which happens to fit the DMA32 zone. |
| 4111 | */ |
| 4112 | page = alloc_page(GFP_KERNEL | __GFP_DMA32); |
| 4113 | if (!page) |
Wei Yongjun | d7fa6ab | 2010-01-22 16:55:05 +0800 | [diff] [blame] | 4114 | return -ENOMEM; |
| 4115 | |
Zhang Xiantao | ad312c7 | 2007-12-13 23:50:52 +0800 | [diff] [blame] | 4116 | vcpu->arch.mmu.pae_root = page_address(page); |
Avi Kivity | 17ac10a | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 4117 | for (i = 0; i < 4; ++i) |
Zhang Xiantao | ad312c7 | 2007-12-13 23:50:52 +0800 | [diff] [blame] | 4118 | vcpu->arch.mmu.pae_root[i] = INVALID_PAGE; |
Avi Kivity | 17ac10a | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 4119 | |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 4120 | return 0; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 4121 | } |
| 4122 | |
Ingo Molnar | 8018c27 | 2006-12-29 16:50:01 -0800 | [diff] [blame] | 4123 | int kvm_mmu_create(struct kvm_vcpu *vcpu) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 4124 | { |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 4125 | ASSERT(vcpu); |
Xiao Guangrong | e459e32 | 2011-11-28 20:42:16 +0800 | [diff] [blame] | 4126 | |
| 4127 | vcpu->arch.walk_mmu = &vcpu->arch.mmu; |
| 4128 | vcpu->arch.mmu.root_hpa = INVALID_PAGE; |
| 4129 | vcpu->arch.mmu.translate_gpa = translate_gpa; |
| 4130 | vcpu->arch.nested_mmu.translate_gpa = translate_nested_gpa; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 4131 | |
Ingo Molnar | 8018c27 | 2006-12-29 16:50:01 -0800 | [diff] [blame] | 4132 | return alloc_mmu_pages(vcpu); |
| 4133 | } |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 4134 | |
Ingo Molnar | 8018c27 | 2006-12-29 16:50:01 -0800 | [diff] [blame] | 4135 | int kvm_mmu_setup(struct kvm_vcpu *vcpu) |
| 4136 | { |
| 4137 | ASSERT(vcpu); |
Zhang Xiantao | ad312c7 | 2007-12-13 23:50:52 +0800 | [diff] [blame] | 4138 | ASSERT(!VALID_PAGE(vcpu->arch.mmu.root_hpa)); |
Avi Kivity | 2c26495 | 2006-12-22 01:05:28 -0800 | [diff] [blame] | 4139 | |
Ingo Molnar | 8018c27 | 2006-12-29 16:50:01 -0800 | [diff] [blame] | 4140 | return init_kvm_mmu(vcpu); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 4141 | } |
| 4142 | |
Avi Kivity | 90cb052 | 2007-07-17 13:04:56 +0300 | [diff] [blame] | 4143 | void kvm_mmu_slot_remove_write_access(struct kvm *kvm, int slot) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 4144 | { |
Takuya Yoshikawa | b99db1d | 2013-01-08 19:44:48 +0900 | [diff] [blame] | 4145 | struct kvm_memory_slot *memslot; |
| 4146 | gfn_t last_gfn; |
| 4147 | int i; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 4148 | |
Takuya Yoshikawa | b99db1d | 2013-01-08 19:44:48 +0900 | [diff] [blame] | 4149 | memslot = id_to_memslot(kvm->memslots, slot); |
| 4150 | last_gfn = memslot->base_gfn + memslot->npages - 1; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 4151 | |
Takuya Yoshikawa | 9d1beef | 2013-01-08 19:46:48 +0900 | [diff] [blame] | 4152 | spin_lock(&kvm->mmu_lock); |
| 4153 | |
Takuya Yoshikawa | b99db1d | 2013-01-08 19:44:48 +0900 | [diff] [blame] | 4154 | for (i = PT_PAGE_TABLE_LEVEL; |
| 4155 | i < PT_PAGE_TABLE_LEVEL + KVM_NR_PAGE_SIZES; ++i) { |
| 4156 | unsigned long *rmapp; |
| 4157 | unsigned long last_index, index; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 4158 | |
Takuya Yoshikawa | b99db1d | 2013-01-08 19:44:48 +0900 | [diff] [blame] | 4159 | rmapp = memslot->arch.rmap[i - PT_PAGE_TABLE_LEVEL]; |
| 4160 | last_index = gfn_to_index(last_gfn, memslot->base_gfn, i); |
Xiao Guangrong | da8dc75 | 2011-03-04 18:56:41 +0800 | [diff] [blame] | 4161 | |
Takuya Yoshikawa | b99db1d | 2013-01-08 19:44:48 +0900 | [diff] [blame] | 4162 | for (index = 0; index <= last_index; ++index, ++rmapp) { |
| 4163 | if (*rmapp) |
| 4164 | __rmap_write_protect(kvm, rmapp, false); |
Takuya Yoshikawa | 6b81b05 | 2013-01-08 19:47:33 +0900 | [diff] [blame] | 4165 | |
| 4166 | if (need_resched() || spin_needbreak(&kvm->mmu_lock)) { |
| 4167 | kvm_flush_remote_tlbs(kvm); |
| 4168 | cond_resched_lock(&kvm->mmu_lock); |
| 4169 | } |
Avi Kivity | 8234b22 | 2010-12-27 12:08:45 +0200 | [diff] [blame] | 4170 | } |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 4171 | } |
Takuya Yoshikawa | b99db1d | 2013-01-08 19:44:48 +0900 | [diff] [blame] | 4172 | |
Avi Kivity | 171d595 | 2008-08-27 16:40:51 +0300 | [diff] [blame] | 4173 | kvm_flush_remote_tlbs(kvm); |
Takuya Yoshikawa | 9d1beef | 2013-01-08 19:46:48 +0900 | [diff] [blame] | 4174 | spin_unlock(&kvm->mmu_lock); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 4175 | } |
Avi Kivity | 37a7d8b | 2007-01-05 16:36:56 -0800 | [diff] [blame] | 4176 | |
Avi Kivity | 90cb052 | 2007-07-17 13:04:56 +0300 | [diff] [blame] | 4177 | void kvm_mmu_zap_all(struct kvm *kvm) |
Dor Laor | e0fa826 | 2007-03-30 13:06:33 +0300 | [diff] [blame] | 4178 | { |
Avi Kivity | 4db3531 | 2007-11-21 15:28:32 +0200 | [diff] [blame] | 4179 | struct kvm_mmu_page *sp, *node; |
Xiao Guangrong | d98ba05 | 2010-06-04 21:55:29 +0800 | [diff] [blame] | 4180 | LIST_HEAD(invalid_list); |
Dor Laor | e0fa826 | 2007-03-30 13:06:33 +0300 | [diff] [blame] | 4181 | |
Marcelo Tosatti | aaee2c9 | 2007-12-20 19:18:26 -0500 | [diff] [blame] | 4182 | spin_lock(&kvm->mmu_lock); |
Xiao Guangrong | 3246af0 | 2010-04-16 16:35:54 +0800 | [diff] [blame] | 4183 | restart: |
Zhang Xiantao | f05e70a | 2007-12-14 10:01:48 +0800 | [diff] [blame] | 4184 | list_for_each_entry_safe(sp, node, &kvm->arch.active_mmu_pages, link) |
Xiao Guangrong | d98ba05 | 2010-06-04 21:55:29 +0800 | [diff] [blame] | 4185 | if (kvm_mmu_prepare_zap_page(kvm, sp, &invalid_list)) |
Xiao Guangrong | 3246af0 | 2010-04-16 16:35:54 +0800 | [diff] [blame] | 4186 | goto restart; |
| 4187 | |
Xiao Guangrong | d98ba05 | 2010-06-04 21:55:29 +0800 | [diff] [blame] | 4188 | kvm_mmu_commit_zap_page(kvm, &invalid_list); |
Marcelo Tosatti | aaee2c9 | 2007-12-20 19:18:26 -0500 | [diff] [blame] | 4189 | spin_unlock(&kvm->mmu_lock); |
Dor Laor | e0fa826 | 2007-03-30 13:06:33 +0300 | [diff] [blame] | 4190 | } |
| 4191 | |
Jan Kiszka | 3d56cbd | 2011-12-02 18:35:24 +0100 | [diff] [blame] | 4192 | static void kvm_mmu_remove_some_alloc_mmu_pages(struct kvm *kvm, |
| 4193 | struct list_head *invalid_list) |
Izik Eidus | 3ee16c8 | 2008-03-30 15:17:21 +0300 | [diff] [blame] | 4194 | { |
| 4195 | struct kvm_mmu_page *page; |
| 4196 | |
Xiao Guangrong | 85b7059 | 2012-07-03 14:31:43 +0800 | [diff] [blame] | 4197 | if (list_empty(&kvm->arch.active_mmu_pages)) |
| 4198 | return; |
| 4199 | |
Izik Eidus | 3ee16c8 | 2008-03-30 15:17:21 +0300 | [diff] [blame] | 4200 | page = container_of(kvm->arch.active_mmu_pages.prev, |
| 4201 | struct kvm_mmu_page, link); |
Jan Kiszka | 3d56cbd | 2011-12-02 18:35:24 +0100 | [diff] [blame] | 4202 | kvm_mmu_prepare_zap_page(kvm, page, invalid_list); |
Izik Eidus | 3ee16c8 | 2008-03-30 15:17:21 +0300 | [diff] [blame] | 4203 | } |
| 4204 | |
Ying Han | 1495f23 | 2011-05-24 17:12:27 -0700 | [diff] [blame] | 4205 | static int mmu_shrink(struct shrinker *shrink, struct shrink_control *sc) |
Izik Eidus | 3ee16c8 | 2008-03-30 15:17:21 +0300 | [diff] [blame] | 4206 | { |
| 4207 | struct kvm *kvm; |
Ying Han | 1495f23 | 2011-05-24 17:12:27 -0700 | [diff] [blame] | 4208 | int nr_to_scan = sc->nr_to_scan; |
Dave Hansen | 45221ab | 2010-08-19 18:11:37 -0700 | [diff] [blame] | 4209 | |
| 4210 | if (nr_to_scan == 0) |
| 4211 | goto out; |
Izik Eidus | 3ee16c8 | 2008-03-30 15:17:21 +0300 | [diff] [blame] | 4212 | |
Jan Kiszka | e935b83 | 2011-02-08 12:55:33 +0100 | [diff] [blame] | 4213 | raw_spin_lock(&kvm_lock); |
Izik Eidus | 3ee16c8 | 2008-03-30 15:17:21 +0300 | [diff] [blame] | 4214 | |
| 4215 | list_for_each_entry(kvm, &vm_list, vm_list) { |
Jan Kiszka | 3d56cbd | 2011-12-02 18:35:24 +0100 | [diff] [blame] | 4216 | int idx; |
Xiao Guangrong | d98ba05 | 2010-06-04 21:55:29 +0800 | [diff] [blame] | 4217 | LIST_HEAD(invalid_list); |
Izik Eidus | 3ee16c8 | 2008-03-30 15:17:21 +0300 | [diff] [blame] | 4218 | |
Gleb Natapov | 1952639 | 2012-06-04 14:53:23 +0300 | [diff] [blame] | 4219 | /* |
Takuya Yoshikawa | 35f2d16 | 2012-08-20 18:35:39 +0900 | [diff] [blame] | 4220 | * Never scan more than sc->nr_to_scan VM instances. |
| 4221 | * Will not hit this condition practically since we do not try |
| 4222 | * to shrink more than one VM and it is very unlikely to see |
| 4223 | * !n_used_mmu_pages so many times. |
| 4224 | */ |
| 4225 | if (!nr_to_scan--) |
| 4226 | break; |
| 4227 | /* |
Gleb Natapov | 1952639 | 2012-06-04 14:53:23 +0300 | [diff] [blame] | 4228 | * n_used_mmu_pages is accessed without holding kvm->mmu_lock |
| 4229 | * here. We may skip a VM instance errorneosly, but we do not |
| 4230 | * want to shrink a VM that only started to populate its MMU |
| 4231 | * anyway. |
| 4232 | */ |
Takuya Yoshikawa | 35f2d16 | 2012-08-20 18:35:39 +0900 | [diff] [blame] | 4233 | if (!kvm->arch.n_used_mmu_pages) |
Gleb Natapov | 1952639 | 2012-06-04 14:53:23 +0300 | [diff] [blame] | 4234 | continue; |
Gleb Natapov | 1952639 | 2012-06-04 14:53:23 +0300 | [diff] [blame] | 4235 | |
Marcelo Tosatti | f656ce0 | 2009-12-23 14:35:25 -0200 | [diff] [blame] | 4236 | idx = srcu_read_lock(&kvm->srcu); |
Izik Eidus | 3ee16c8 | 2008-03-30 15:17:21 +0300 | [diff] [blame] | 4237 | spin_lock(&kvm->mmu_lock); |
Izik Eidus | 3ee16c8 | 2008-03-30 15:17:21 +0300 | [diff] [blame] | 4238 | |
Gleb Natapov | 1952639 | 2012-06-04 14:53:23 +0300 | [diff] [blame] | 4239 | kvm_mmu_remove_some_alloc_mmu_pages(kvm, &invalid_list); |
Xiao Guangrong | d98ba05 | 2010-06-04 21:55:29 +0800 | [diff] [blame] | 4240 | kvm_mmu_commit_zap_page(kvm, &invalid_list); |
Gleb Natapov | 1952639 | 2012-06-04 14:53:23 +0300 | [diff] [blame] | 4241 | |
Izik Eidus | 3ee16c8 | 2008-03-30 15:17:21 +0300 | [diff] [blame] | 4242 | spin_unlock(&kvm->mmu_lock); |
Marcelo Tosatti | f656ce0 | 2009-12-23 14:35:25 -0200 | [diff] [blame] | 4243 | srcu_read_unlock(&kvm->srcu, idx); |
Gleb Natapov | 1952639 | 2012-06-04 14:53:23 +0300 | [diff] [blame] | 4244 | |
| 4245 | list_move_tail(&kvm->vm_list, &vm_list); |
| 4246 | break; |
Izik Eidus | 3ee16c8 | 2008-03-30 15:17:21 +0300 | [diff] [blame] | 4247 | } |
Izik Eidus | 3ee16c8 | 2008-03-30 15:17:21 +0300 | [diff] [blame] | 4248 | |
Jan Kiszka | e935b83 | 2011-02-08 12:55:33 +0100 | [diff] [blame] | 4249 | raw_spin_unlock(&kvm_lock); |
Izik Eidus | 3ee16c8 | 2008-03-30 15:17:21 +0300 | [diff] [blame] | 4250 | |
Dave Hansen | 45221ab | 2010-08-19 18:11:37 -0700 | [diff] [blame] | 4251 | out: |
| 4252 | return percpu_counter_read_positive(&kvm_total_used_mmu_pages); |
Izik Eidus | 3ee16c8 | 2008-03-30 15:17:21 +0300 | [diff] [blame] | 4253 | } |
| 4254 | |
| 4255 | static struct shrinker mmu_shrinker = { |
| 4256 | .shrink = mmu_shrink, |
| 4257 | .seeks = DEFAULT_SEEKS * 10, |
| 4258 | }; |
| 4259 | |
Ingo Molnar | 2ddfd20 | 2008-05-22 10:37:48 +0200 | [diff] [blame] | 4260 | static void mmu_destroy_caches(void) |
Avi Kivity | b5a33a7 | 2007-04-15 16:31:09 +0300 | [diff] [blame] | 4261 | { |
Xiao Guangrong | 53c07b1 | 2011-05-15 23:26:20 +0800 | [diff] [blame] | 4262 | if (pte_list_desc_cache) |
| 4263 | kmem_cache_destroy(pte_list_desc_cache); |
Avi Kivity | d3d25b0 | 2007-05-30 12:34:53 +0300 | [diff] [blame] | 4264 | if (mmu_page_header_cache) |
| 4265 | kmem_cache_destroy(mmu_page_header_cache); |
Avi Kivity | b5a33a7 | 2007-04-15 16:31:09 +0300 | [diff] [blame] | 4266 | } |
| 4267 | |
| 4268 | int kvm_mmu_module_init(void) |
| 4269 | { |
Xiao Guangrong | 53c07b1 | 2011-05-15 23:26:20 +0800 | [diff] [blame] | 4270 | pte_list_desc_cache = kmem_cache_create("pte_list_desc", |
| 4271 | sizeof(struct pte_list_desc), |
Paul Mundt | 20c2df8 | 2007-07-20 10:11:58 +0900 | [diff] [blame] | 4272 | 0, 0, NULL); |
Xiao Guangrong | 53c07b1 | 2011-05-15 23:26:20 +0800 | [diff] [blame] | 4273 | if (!pte_list_desc_cache) |
Avi Kivity | b5a33a7 | 2007-04-15 16:31:09 +0300 | [diff] [blame] | 4274 | goto nomem; |
| 4275 | |
Avi Kivity | d3d25b0 | 2007-05-30 12:34:53 +0300 | [diff] [blame] | 4276 | mmu_page_header_cache = kmem_cache_create("kvm_mmu_page_header", |
| 4277 | sizeof(struct kvm_mmu_page), |
Paul Mundt | 20c2df8 | 2007-07-20 10:11:58 +0900 | [diff] [blame] | 4278 | 0, 0, NULL); |
Avi Kivity | d3d25b0 | 2007-05-30 12:34:53 +0300 | [diff] [blame] | 4279 | if (!mmu_page_header_cache) |
| 4280 | goto nomem; |
| 4281 | |
Wei Yongjun | 45bf21a | 2010-08-23 16:13:15 +0800 | [diff] [blame] | 4282 | if (percpu_counter_init(&kvm_total_used_mmu_pages, 0)) |
| 4283 | goto nomem; |
| 4284 | |
Izik Eidus | 3ee16c8 | 2008-03-30 15:17:21 +0300 | [diff] [blame] | 4285 | register_shrinker(&mmu_shrinker); |
| 4286 | |
Avi Kivity | b5a33a7 | 2007-04-15 16:31:09 +0300 | [diff] [blame] | 4287 | return 0; |
| 4288 | |
| 4289 | nomem: |
Izik Eidus | 3ee16c8 | 2008-03-30 15:17:21 +0300 | [diff] [blame] | 4290 | mmu_destroy_caches(); |
Avi Kivity | b5a33a7 | 2007-04-15 16:31:09 +0300 | [diff] [blame] | 4291 | return -ENOMEM; |
| 4292 | } |
| 4293 | |
Zhang Xiantao | 3ad82a7 | 2007-11-20 13:11:38 +0800 | [diff] [blame] | 4294 | /* |
| 4295 | * Caculate mmu pages needed for kvm. |
| 4296 | */ |
| 4297 | unsigned int kvm_mmu_calculate_mmu_pages(struct kvm *kvm) |
| 4298 | { |
Zhang Xiantao | 3ad82a7 | 2007-11-20 13:11:38 +0800 | [diff] [blame] | 4299 | unsigned int nr_mmu_pages; |
| 4300 | unsigned int nr_pages = 0; |
Marcelo Tosatti | bc6678a | 2009-12-23 14:35:21 -0200 | [diff] [blame] | 4301 | struct kvm_memslots *slots; |
Xiao Guangrong | be6ba0f | 2011-11-24 17:39:18 +0800 | [diff] [blame] | 4302 | struct kvm_memory_slot *memslot; |
Zhang Xiantao | 3ad82a7 | 2007-11-20 13:11:38 +0800 | [diff] [blame] | 4303 | |
Lai Jiangshan | 90d83dc | 2010-04-19 17:41:23 +0800 | [diff] [blame] | 4304 | slots = kvm_memslots(kvm); |
| 4305 | |
Xiao Guangrong | be6ba0f | 2011-11-24 17:39:18 +0800 | [diff] [blame] | 4306 | kvm_for_each_memslot(memslot, slots) |
| 4307 | nr_pages += memslot->npages; |
Zhang Xiantao | 3ad82a7 | 2007-11-20 13:11:38 +0800 | [diff] [blame] | 4308 | |
| 4309 | nr_mmu_pages = nr_pages * KVM_PERMILLE_MMU_PAGES / 1000; |
| 4310 | nr_mmu_pages = max(nr_mmu_pages, |
| 4311 | (unsigned int) KVM_MIN_ALLOC_MMU_PAGES); |
| 4312 | |
| 4313 | return nr_mmu_pages; |
| 4314 | } |
| 4315 | |
Marcelo Tosatti | 94d8b05 | 2009-06-11 12:07:42 -0300 | [diff] [blame] | 4316 | int kvm_mmu_get_spte_hierarchy(struct kvm_vcpu *vcpu, u64 addr, u64 sptes[4]) |
| 4317 | { |
| 4318 | struct kvm_shadow_walk_iterator iterator; |
Xiao Guangrong | c2a2ac2 | 2011-07-12 03:32:13 +0800 | [diff] [blame] | 4319 | u64 spte; |
Marcelo Tosatti | 94d8b05 | 2009-06-11 12:07:42 -0300 | [diff] [blame] | 4320 | int nr_sptes = 0; |
| 4321 | |
Xiao Guangrong | c2a2ac2 | 2011-07-12 03:32:13 +0800 | [diff] [blame] | 4322 | walk_shadow_page_lockless_begin(vcpu); |
| 4323 | for_each_shadow_entry_lockless(vcpu, addr, iterator, spte) { |
| 4324 | sptes[iterator.level-1] = spte; |
Marcelo Tosatti | 94d8b05 | 2009-06-11 12:07:42 -0300 | [diff] [blame] | 4325 | nr_sptes++; |
Xiao Guangrong | c2a2ac2 | 2011-07-12 03:32:13 +0800 | [diff] [blame] | 4326 | if (!is_shadow_present_pte(spte)) |
Marcelo Tosatti | 94d8b05 | 2009-06-11 12:07:42 -0300 | [diff] [blame] | 4327 | break; |
| 4328 | } |
Xiao Guangrong | c2a2ac2 | 2011-07-12 03:32:13 +0800 | [diff] [blame] | 4329 | walk_shadow_page_lockless_end(vcpu); |
Marcelo Tosatti | 94d8b05 | 2009-06-11 12:07:42 -0300 | [diff] [blame] | 4330 | |
| 4331 | return nr_sptes; |
| 4332 | } |
| 4333 | EXPORT_SYMBOL_GPL(kvm_mmu_get_spte_hierarchy); |
| 4334 | |
Xiao Guangrong | c42fffe | 2010-09-27 18:07:07 +0800 | [diff] [blame] | 4335 | void kvm_mmu_destroy(struct kvm_vcpu *vcpu) |
| 4336 | { |
| 4337 | ASSERT(vcpu); |
| 4338 | |
| 4339 | destroy_kvm_mmu(vcpu); |
| 4340 | free_mmu_pages(vcpu); |
| 4341 | mmu_free_memory_caches(vcpu); |
Xiao Guangrong | b034cf0 | 2010-12-23 16:08:35 +0800 | [diff] [blame] | 4342 | } |
| 4343 | |
Xiao Guangrong | b034cf0 | 2010-12-23 16:08:35 +0800 | [diff] [blame] | 4344 | void kvm_mmu_module_exit(void) |
| 4345 | { |
| 4346 | mmu_destroy_caches(); |
| 4347 | percpu_counter_destroy(&kvm_total_used_mmu_pages); |
| 4348 | unregister_shrinker(&mmu_shrinker); |
Xiao Guangrong | c42fffe | 2010-09-27 18:07:07 +0800 | [diff] [blame] | 4349 | mmu_audit_disable(); |
| 4350 | } |