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 | { |
| 451 | return !(~spte & (SPTE_HOST_WRITEABLE | SPTE_MMU_WRITEABLE)); |
| 452 | } |
| 453 | |
Xiao Guangrong | 8672b72 | 2010-08-02 16:14:04 +0800 | [diff] [blame] | 454 | static bool spte_has_volatile_bits(u64 spte) |
| 455 | { |
Xiao Guangrong | c7ba5b4 | 2012-06-20 15:59:18 +0800 | [diff] [blame] | 456 | /* |
| 457 | * Always atomicly update spte if it can be updated |
| 458 | * out of mmu-lock, it can ensure dirty bit is not lost, |
| 459 | * also, it can help us to get a stable is_writable_pte() |
| 460 | * to ensure tlb flush is not missed. |
| 461 | */ |
| 462 | if (spte_is_locklessly_modifiable(spte)) |
| 463 | return true; |
| 464 | |
Xiao Guangrong | 8672b72 | 2010-08-02 16:14:04 +0800 | [diff] [blame] | 465 | if (!shadow_accessed_mask) |
| 466 | return false; |
| 467 | |
| 468 | if (!is_shadow_present_pte(spte)) |
| 469 | return false; |
| 470 | |
Xiao Guangrong | 4132779 | 2010-08-02 16:15:08 +0800 | [diff] [blame] | 471 | if ((spte & shadow_accessed_mask) && |
| 472 | (!is_writable_pte(spte) || (spte & shadow_dirty_mask))) |
Xiao Guangrong | 8672b72 | 2010-08-02 16:14:04 +0800 | [diff] [blame] | 473 | return false; |
| 474 | |
| 475 | return true; |
| 476 | } |
| 477 | |
Xiao Guangrong | 4132779 | 2010-08-02 16:15:08 +0800 | [diff] [blame] | 478 | static bool spte_is_bit_cleared(u64 old_spte, u64 new_spte, u64 bit_mask) |
| 479 | { |
| 480 | return (old_spte & bit_mask) && !(new_spte & bit_mask); |
| 481 | } |
| 482 | |
Xiao Guangrong | 1df9f2d | 2011-07-12 03:30:35 +0800 | [diff] [blame] | 483 | /* Rules for using mmu_spte_set: |
| 484 | * Set the sptep from nonpresent to present. |
| 485 | * Note: the sptep being assigned *must* be either not present |
| 486 | * or in a state where the hardware will not attempt to update |
| 487 | * the spte. |
| 488 | */ |
| 489 | static void mmu_spte_set(u64 *sptep, u64 new_spte) |
| 490 | { |
| 491 | WARN_ON(is_shadow_present_pte(*sptep)); |
| 492 | __set_spte(sptep, new_spte); |
| 493 | } |
| 494 | |
| 495 | /* Rules for using mmu_spte_update: |
| 496 | * Update the state bits, it means the mapped pfn is not changged. |
Xiao Guangrong | 6e7d035 | 2012-06-20 15:58:33 +0800 | [diff] [blame] | 497 | * |
| 498 | * Whenever we overwrite a writable spte with a read-only one we |
| 499 | * should flush remote TLBs. Otherwise rmap_write_protect |
| 500 | * will find a read-only spte, even though the writable spte |
| 501 | * might be cached on a CPU's TLB, the return value indicates this |
| 502 | * case. |
Xiao Guangrong | 1df9f2d | 2011-07-12 03:30:35 +0800 | [diff] [blame] | 503 | */ |
Xiao Guangrong | 6e7d035 | 2012-06-20 15:58:33 +0800 | [diff] [blame] | 504 | static bool mmu_spte_update(u64 *sptep, u64 new_spte) |
Avi Kivity | b79b93f | 2010-06-06 15:46:44 +0300 | [diff] [blame] | 505 | { |
Xiao Guangrong | c7ba5b4 | 2012-06-20 15:59:18 +0800 | [diff] [blame] | 506 | u64 old_spte = *sptep; |
Xiao Guangrong | 6e7d035 | 2012-06-20 15:58:33 +0800 | [diff] [blame] | 507 | bool ret = false; |
Avi Kivity | b79b93f | 2010-06-06 15:46:44 +0300 | [diff] [blame] | 508 | |
Xiao Guangrong | 4132779 | 2010-08-02 16:15:08 +0800 | [diff] [blame] | 509 | WARN_ON(!is_rmap_spte(new_spte)); |
| 510 | |
Xiao Guangrong | 6e7d035 | 2012-06-20 15:58:33 +0800 | [diff] [blame] | 511 | if (!is_shadow_present_pte(old_spte)) { |
| 512 | mmu_spte_set(sptep, new_spte); |
| 513 | return ret; |
| 514 | } |
Xiao Guangrong | 1df9f2d | 2011-07-12 03:30:35 +0800 | [diff] [blame] | 515 | |
Xiao Guangrong | c7ba5b4 | 2012-06-20 15:59:18 +0800 | [diff] [blame] | 516 | if (!spte_has_volatile_bits(old_spte)) |
Xiao Guangrong | 603e065 | 2011-07-12 03:31:28 +0800 | [diff] [blame] | 517 | __update_clear_spte_fast(sptep, new_spte); |
Xiao Guangrong | 4132779 | 2010-08-02 16:15:08 +0800 | [diff] [blame] | 518 | else |
Xiao Guangrong | 603e065 | 2011-07-12 03:31:28 +0800 | [diff] [blame] | 519 | old_spte = __update_clear_spte_slow(sptep, new_spte); |
Xiao Guangrong | 4132779 | 2010-08-02 16:15:08 +0800 | [diff] [blame] | 520 | |
Xiao Guangrong | c7ba5b4 | 2012-06-20 15:59:18 +0800 | [diff] [blame] | 521 | /* |
| 522 | * For the spte updated out of mmu-lock is safe, since |
| 523 | * we always atomicly update it, see the comments in |
| 524 | * spte_has_volatile_bits(). |
| 525 | */ |
Xiao Guangrong | 6e7d035 | 2012-06-20 15:58:33 +0800 | [diff] [blame] | 526 | if (is_writable_pte(old_spte) && !is_writable_pte(new_spte)) |
| 527 | ret = true; |
| 528 | |
Xiao Guangrong | 4132779 | 2010-08-02 16:15:08 +0800 | [diff] [blame] | 529 | if (!shadow_accessed_mask) |
Xiao Guangrong | 6e7d035 | 2012-06-20 15:58:33 +0800 | [diff] [blame] | 530 | return ret; |
Xiao Guangrong | 4132779 | 2010-08-02 16:15:08 +0800 | [diff] [blame] | 531 | |
| 532 | if (spte_is_bit_cleared(old_spte, new_spte, shadow_accessed_mask)) |
| 533 | kvm_set_pfn_accessed(spte_to_pfn(old_spte)); |
| 534 | if (spte_is_bit_cleared(old_spte, new_spte, shadow_dirty_mask)) |
| 535 | kvm_set_pfn_dirty(spte_to_pfn(old_spte)); |
Xiao Guangrong | 6e7d035 | 2012-06-20 15:58:33 +0800 | [diff] [blame] | 536 | |
| 537 | return ret; |
Avi Kivity | b79b93f | 2010-06-06 15:46:44 +0300 | [diff] [blame] | 538 | } |
| 539 | |
Xiao Guangrong | 1df9f2d | 2011-07-12 03:30:35 +0800 | [diff] [blame] | 540 | /* |
| 541 | * Rules for using mmu_spte_clear_track_bits: |
| 542 | * It sets the sptep from present to nonpresent, and track the |
| 543 | * state bits, it is used to clear the last level sptep. |
| 544 | */ |
| 545 | static int mmu_spte_clear_track_bits(u64 *sptep) |
| 546 | { |
| 547 | pfn_t pfn; |
| 548 | u64 old_spte = *sptep; |
| 549 | |
| 550 | if (!spte_has_volatile_bits(old_spte)) |
Xiao Guangrong | 603e065 | 2011-07-12 03:31:28 +0800 | [diff] [blame] | 551 | __update_clear_spte_fast(sptep, 0ull); |
Xiao Guangrong | 1df9f2d | 2011-07-12 03:30:35 +0800 | [diff] [blame] | 552 | else |
Xiao Guangrong | 603e065 | 2011-07-12 03:31:28 +0800 | [diff] [blame] | 553 | old_spte = __update_clear_spte_slow(sptep, 0ull); |
Xiao Guangrong | 1df9f2d | 2011-07-12 03:30:35 +0800 | [diff] [blame] | 554 | |
| 555 | if (!is_rmap_spte(old_spte)) |
| 556 | return 0; |
| 557 | |
| 558 | pfn = spte_to_pfn(old_spte); |
Xiao Guangrong | 86fde74 | 2012-07-17 21:52:52 +0800 | [diff] [blame] | 559 | |
| 560 | /* |
| 561 | * KVM does not hold the refcount of the page used by |
| 562 | * kvm mmu, before reclaiming the page, we should |
| 563 | * unmap it from mmu first. |
| 564 | */ |
| 565 | WARN_ON(!kvm_is_mmio_pfn(pfn) && !page_count(pfn_to_page(pfn))); |
| 566 | |
Xiao Guangrong | 1df9f2d | 2011-07-12 03:30:35 +0800 | [diff] [blame] | 567 | if (!shadow_accessed_mask || old_spte & shadow_accessed_mask) |
| 568 | kvm_set_pfn_accessed(pfn); |
| 569 | if (!shadow_dirty_mask || (old_spte & shadow_dirty_mask)) |
| 570 | kvm_set_pfn_dirty(pfn); |
| 571 | return 1; |
| 572 | } |
| 573 | |
| 574 | /* |
| 575 | * Rules for using mmu_spte_clear_no_track: |
| 576 | * Directly clear spte without caring the state bits of sptep, |
| 577 | * it is used to set the upper level spte. |
| 578 | */ |
| 579 | static void mmu_spte_clear_no_track(u64 *sptep) |
| 580 | { |
Xiao Guangrong | 603e065 | 2011-07-12 03:31:28 +0800 | [diff] [blame] | 581 | __update_clear_spte_fast(sptep, 0ull); |
Xiao Guangrong | 1df9f2d | 2011-07-12 03:30:35 +0800 | [diff] [blame] | 582 | } |
| 583 | |
Xiao Guangrong | c2a2ac2 | 2011-07-12 03:32:13 +0800 | [diff] [blame] | 584 | static u64 mmu_spte_get_lockless(u64 *sptep) |
| 585 | { |
| 586 | return __get_spte_lockless(sptep); |
| 587 | } |
| 588 | |
| 589 | static void walk_shadow_page_lockless_begin(struct kvm_vcpu *vcpu) |
| 590 | { |
Avi Kivity | c142786 | 2012-05-14 15:44:06 +0300 | [diff] [blame] | 591 | /* |
| 592 | * Prevent page table teardown by making any free-er wait during |
| 593 | * kvm_flush_remote_tlbs() IPI to all active vcpus. |
| 594 | */ |
| 595 | local_irq_disable(); |
| 596 | vcpu->mode = READING_SHADOW_PAGE_TABLES; |
| 597 | /* |
| 598 | * Make sure a following spte read is not reordered ahead of the write |
| 599 | * to vcpu->mode. |
| 600 | */ |
| 601 | smp_mb(); |
Xiao Guangrong | c2a2ac2 | 2011-07-12 03:32:13 +0800 | [diff] [blame] | 602 | } |
| 603 | |
| 604 | static void walk_shadow_page_lockless_end(struct kvm_vcpu *vcpu) |
| 605 | { |
Avi Kivity | c142786 | 2012-05-14 15:44:06 +0300 | [diff] [blame] | 606 | /* |
| 607 | * Make sure the write to vcpu->mode is not reordered in front of |
| 608 | * reads to sptes. If it does, kvm_commit_zap_page() can see us |
| 609 | * OUTSIDE_GUEST_MODE and proceed to free the shadow page table. |
| 610 | */ |
| 611 | smp_mb(); |
| 612 | vcpu->mode = OUTSIDE_GUEST_MODE; |
| 613 | local_irq_enable(); |
Xiao Guangrong | c2a2ac2 | 2011-07-12 03:32:13 +0800 | [diff] [blame] | 614 | } |
| 615 | |
Avi Kivity | e2dec93 | 2007-01-05 16:36:54 -0800 | [diff] [blame] | 616 | static int mmu_topup_memory_cache(struct kvm_mmu_memory_cache *cache, |
Avi Kivity | 2e3e588 | 2007-09-10 11:28:17 +0300 | [diff] [blame] | 617 | struct kmem_cache *base_cache, int min) |
Avi Kivity | 714b93d | 2007-01-05 16:36:53 -0800 | [diff] [blame] | 618 | { |
| 619 | void *obj; |
| 620 | |
| 621 | if (cache->nobjs >= min) |
Avi Kivity | e2dec93 | 2007-01-05 16:36:54 -0800 | [diff] [blame] | 622 | return 0; |
Avi Kivity | 714b93d | 2007-01-05 16:36:53 -0800 | [diff] [blame] | 623 | while (cache->nobjs < ARRAY_SIZE(cache->objects)) { |
Avi Kivity | 2e3e588 | 2007-09-10 11:28:17 +0300 | [diff] [blame] | 624 | obj = kmem_cache_zalloc(base_cache, GFP_KERNEL); |
Avi Kivity | 714b93d | 2007-01-05 16:36:53 -0800 | [diff] [blame] | 625 | if (!obj) |
Avi Kivity | e2dec93 | 2007-01-05 16:36:54 -0800 | [diff] [blame] | 626 | return -ENOMEM; |
Avi Kivity | 714b93d | 2007-01-05 16:36:53 -0800 | [diff] [blame] | 627 | cache->objects[cache->nobjs++] = obj; |
| 628 | } |
Avi Kivity | e2dec93 | 2007-01-05 16:36:54 -0800 | [diff] [blame] | 629 | return 0; |
Avi Kivity | 714b93d | 2007-01-05 16:36:53 -0800 | [diff] [blame] | 630 | } |
| 631 | |
Xiao Guangrong | f759e2b | 2011-09-22 16:53:17 +0800 | [diff] [blame] | 632 | static int mmu_memory_cache_free_objects(struct kvm_mmu_memory_cache *cache) |
| 633 | { |
| 634 | return cache->nobjs; |
| 635 | } |
| 636 | |
Xiao Guangrong | e8ad9a7 | 2010-05-13 10:06:02 +0800 | [diff] [blame] | 637 | static void mmu_free_memory_cache(struct kvm_mmu_memory_cache *mc, |
| 638 | struct kmem_cache *cache) |
Avi Kivity | 714b93d | 2007-01-05 16:36:53 -0800 | [diff] [blame] | 639 | { |
| 640 | while (mc->nobjs) |
Xiao Guangrong | e8ad9a7 | 2010-05-13 10:06:02 +0800 | [diff] [blame] | 641 | kmem_cache_free(cache, mc->objects[--mc->nobjs]); |
Avi Kivity | 714b93d | 2007-01-05 16:36:53 -0800 | [diff] [blame] | 642 | } |
| 643 | |
Avi Kivity | c1158e6 | 2007-07-20 08:18:27 +0300 | [diff] [blame] | 644 | 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] | 645 | int min) |
Avi Kivity | c1158e6 | 2007-07-20 08:18:27 +0300 | [diff] [blame] | 646 | { |
Xiao Guangrong | 842f22e | 2011-03-04 19:01:10 +0800 | [diff] [blame] | 647 | void *page; |
Avi Kivity | c1158e6 | 2007-07-20 08:18:27 +0300 | [diff] [blame] | 648 | |
| 649 | if (cache->nobjs >= min) |
| 650 | return 0; |
| 651 | while (cache->nobjs < ARRAY_SIZE(cache->objects)) { |
Xiao Guangrong | 842f22e | 2011-03-04 19:01:10 +0800 | [diff] [blame] | 652 | page = (void *)__get_free_page(GFP_KERNEL); |
Avi Kivity | c1158e6 | 2007-07-20 08:18:27 +0300 | [diff] [blame] | 653 | if (!page) |
| 654 | return -ENOMEM; |
Xiao Guangrong | 842f22e | 2011-03-04 19:01:10 +0800 | [diff] [blame] | 655 | cache->objects[cache->nobjs++] = page; |
Avi Kivity | c1158e6 | 2007-07-20 08:18:27 +0300 | [diff] [blame] | 656 | } |
| 657 | return 0; |
| 658 | } |
| 659 | |
| 660 | static void mmu_free_memory_cache_page(struct kvm_mmu_memory_cache *mc) |
| 661 | { |
| 662 | while (mc->nobjs) |
Avi Kivity | c4d198d | 2007-07-21 09:06:46 +0300 | [diff] [blame] | 663 | free_page((unsigned long)mc->objects[--mc->nobjs]); |
Avi Kivity | c1158e6 | 2007-07-20 08:18:27 +0300 | [diff] [blame] | 664 | } |
| 665 | |
Avi Kivity | 8c43850 | 2007-04-16 11:53:17 +0300 | [diff] [blame] | 666 | static int mmu_topup_memory_caches(struct kvm_vcpu *vcpu) |
| 667 | { |
| 668 | int r; |
| 669 | |
Xiao Guangrong | 53c07b1 | 2011-05-15 23:26:20 +0800 | [diff] [blame] | 670 | r = mmu_topup_memory_cache(&vcpu->arch.mmu_pte_list_desc_cache, |
Xiao Guangrong | 67052b3 | 2011-05-15 23:27:08 +0800 | [diff] [blame] | 671 | pte_list_desc_cache, 8 + PTE_PREFETCH_NUM); |
Avi Kivity | 2e3e588 | 2007-09-10 11:28:17 +0300 | [diff] [blame] | 672 | if (r) |
| 673 | goto out; |
Zhang Xiantao | ad312c7 | 2007-12-13 23:50:52 +0800 | [diff] [blame] | 674 | r = mmu_topup_memory_cache_page(&vcpu->arch.mmu_page_cache, 8); |
Avi Kivity | 2e3e588 | 2007-09-10 11:28:17 +0300 | [diff] [blame] | 675 | if (r) |
| 676 | goto out; |
Zhang Xiantao | ad312c7 | 2007-12-13 23:50:52 +0800 | [diff] [blame] | 677 | r = mmu_topup_memory_cache(&vcpu->arch.mmu_page_header_cache, |
Avi Kivity | 2e3e588 | 2007-09-10 11:28:17 +0300 | [diff] [blame] | 678 | mmu_page_header_cache, 4); |
| 679 | out: |
Avi Kivity | 8c43850 | 2007-04-16 11:53:17 +0300 | [diff] [blame] | 680 | return r; |
| 681 | } |
| 682 | |
Avi Kivity | 714b93d | 2007-01-05 16:36:53 -0800 | [diff] [blame] | 683 | static void mmu_free_memory_caches(struct kvm_vcpu *vcpu) |
| 684 | { |
Xiao Guangrong | 53c07b1 | 2011-05-15 23:26:20 +0800 | [diff] [blame] | 685 | mmu_free_memory_cache(&vcpu->arch.mmu_pte_list_desc_cache, |
| 686 | pte_list_desc_cache); |
Zhang Xiantao | ad312c7 | 2007-12-13 23:50:52 +0800 | [diff] [blame] | 687 | mmu_free_memory_cache_page(&vcpu->arch.mmu_page_cache); |
Xiao Guangrong | e8ad9a7 | 2010-05-13 10:06:02 +0800 | [diff] [blame] | 688 | mmu_free_memory_cache(&vcpu->arch.mmu_page_header_cache, |
| 689 | mmu_page_header_cache); |
Avi Kivity | 714b93d | 2007-01-05 16:36:53 -0800 | [diff] [blame] | 690 | } |
| 691 | |
Takuya Yoshikawa | 80feb89 | 2012-05-29 23:54:26 +0900 | [diff] [blame] | 692 | static void *mmu_memory_cache_alloc(struct kvm_mmu_memory_cache *mc) |
Avi Kivity | 714b93d | 2007-01-05 16:36:53 -0800 | [diff] [blame] | 693 | { |
| 694 | void *p; |
| 695 | |
| 696 | BUG_ON(!mc->nobjs); |
| 697 | p = mc->objects[--mc->nobjs]; |
Avi Kivity | 714b93d | 2007-01-05 16:36:53 -0800 | [diff] [blame] | 698 | return p; |
| 699 | } |
| 700 | |
Xiao Guangrong | 53c07b1 | 2011-05-15 23:26:20 +0800 | [diff] [blame] | 701 | 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] | 702 | { |
Takuya Yoshikawa | 80feb89 | 2012-05-29 23:54:26 +0900 | [diff] [blame] | 703 | return mmu_memory_cache_alloc(&vcpu->arch.mmu_pte_list_desc_cache); |
Avi Kivity | 714b93d | 2007-01-05 16:36:53 -0800 | [diff] [blame] | 704 | } |
| 705 | |
Xiao Guangrong | 53c07b1 | 2011-05-15 23:26:20 +0800 | [diff] [blame] | 706 | 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] | 707 | { |
Xiao Guangrong | 53c07b1 | 2011-05-15 23:26:20 +0800 | [diff] [blame] | 708 | kmem_cache_free(pte_list_desc_cache, pte_list_desc); |
Avi Kivity | 714b93d | 2007-01-05 16:36:53 -0800 | [diff] [blame] | 709 | } |
| 710 | |
Lai Jiangshan | 2032a93 | 2010-05-26 16:49:59 +0800 | [diff] [blame] | 711 | static gfn_t kvm_mmu_page_get_gfn(struct kvm_mmu_page *sp, int index) |
| 712 | { |
| 713 | if (!sp->role.direct) |
| 714 | return sp->gfns[index]; |
| 715 | |
| 716 | return sp->gfn + (index << ((sp->role.level - 1) * PT64_LEVEL_BITS)); |
| 717 | } |
| 718 | |
| 719 | static void kvm_mmu_page_set_gfn(struct kvm_mmu_page *sp, int index, gfn_t gfn) |
| 720 | { |
| 721 | if (sp->role.direct) |
| 722 | BUG_ON(gfn != kvm_mmu_page_get_gfn(sp, index)); |
| 723 | else |
| 724 | sp->gfns[index] = gfn; |
| 725 | } |
| 726 | |
Avi Kivity | cd4a4e5 | 2007-01-05 16:36:38 -0800 | [diff] [blame] | 727 | /* |
Takuya Yoshikawa | d4dbf47 | 2010-12-07 12:59:07 +0900 | [diff] [blame] | 728 | * Return the pointer to the large page information for a given gfn, |
| 729 | * handling slots that are not large page aligned. |
Marcelo Tosatti | 05da455 | 2008-02-23 11:44:30 -0300 | [diff] [blame] | 730 | */ |
Takuya Yoshikawa | d4dbf47 | 2010-12-07 12:59:07 +0900 | [diff] [blame] | 731 | static struct kvm_lpage_info *lpage_info_slot(gfn_t gfn, |
| 732 | struct kvm_memory_slot *slot, |
| 733 | int level) |
Marcelo Tosatti | 05da455 | 2008-02-23 11:44:30 -0300 | [diff] [blame] | 734 | { |
| 735 | unsigned long idx; |
| 736 | |
Takuya Yoshikawa | fb03cb6 | 2012-02-08 12:59:10 +0900 | [diff] [blame] | 737 | idx = gfn_to_index(gfn, slot->base_gfn, level); |
Takuya Yoshikawa | db3fe4e | 2012-02-08 13:02:18 +0900 | [diff] [blame] | 738 | return &slot->arch.lpage_info[level - 2][idx]; |
Marcelo Tosatti | 05da455 | 2008-02-23 11:44:30 -0300 | [diff] [blame] | 739 | } |
| 740 | |
| 741 | static void account_shadowed(struct kvm *kvm, gfn_t gfn) |
| 742 | { |
Joerg Roedel | d25797b | 2009-07-27 16:30:43 +0200 | [diff] [blame] | 743 | struct kvm_memory_slot *slot; |
Takuya Yoshikawa | d4dbf47 | 2010-12-07 12:59:07 +0900 | [diff] [blame] | 744 | struct kvm_lpage_info *linfo; |
Joerg Roedel | d25797b | 2009-07-27 16:30:43 +0200 | [diff] [blame] | 745 | int i; |
Marcelo Tosatti | 05da455 | 2008-02-23 11:44:30 -0300 | [diff] [blame] | 746 | |
Avi Kivity | a1f4d395 | 2010-06-21 11:44:20 +0300 | [diff] [blame] | 747 | slot = gfn_to_memslot(kvm, gfn); |
Joerg Roedel | d25797b | 2009-07-27 16:30:43 +0200 | [diff] [blame] | 748 | for (i = PT_DIRECTORY_LEVEL; |
| 749 | i < PT_PAGE_TABLE_LEVEL + KVM_NR_PAGE_SIZES; ++i) { |
Takuya Yoshikawa | d4dbf47 | 2010-12-07 12:59:07 +0900 | [diff] [blame] | 750 | linfo = lpage_info_slot(gfn, slot, i); |
| 751 | linfo->write_count += 1; |
Joerg Roedel | d25797b | 2009-07-27 16:30:43 +0200 | [diff] [blame] | 752 | } |
Xiao Guangrong | 332b207 | 2011-05-15 23:20:27 +0800 | [diff] [blame] | 753 | kvm->arch.indirect_shadow_pages++; |
Marcelo Tosatti | 05da455 | 2008-02-23 11:44:30 -0300 | [diff] [blame] | 754 | } |
| 755 | |
| 756 | static void unaccount_shadowed(struct kvm *kvm, gfn_t gfn) |
| 757 | { |
Joerg Roedel | d25797b | 2009-07-27 16:30:43 +0200 | [diff] [blame] | 758 | struct kvm_memory_slot *slot; |
Takuya Yoshikawa | d4dbf47 | 2010-12-07 12:59:07 +0900 | [diff] [blame] | 759 | struct kvm_lpage_info *linfo; |
Joerg Roedel | d25797b | 2009-07-27 16:30:43 +0200 | [diff] [blame] | 760 | int i; |
Marcelo Tosatti | 05da455 | 2008-02-23 11:44:30 -0300 | [diff] [blame] | 761 | |
Avi Kivity | a1f4d395 | 2010-06-21 11:44:20 +0300 | [diff] [blame] | 762 | slot = gfn_to_memslot(kvm, gfn); |
Joerg Roedel | d25797b | 2009-07-27 16:30:43 +0200 | [diff] [blame] | 763 | for (i = PT_DIRECTORY_LEVEL; |
| 764 | i < PT_PAGE_TABLE_LEVEL + KVM_NR_PAGE_SIZES; ++i) { |
Takuya Yoshikawa | d4dbf47 | 2010-12-07 12:59:07 +0900 | [diff] [blame] | 765 | linfo = lpage_info_slot(gfn, slot, i); |
| 766 | linfo->write_count -= 1; |
| 767 | WARN_ON(linfo->write_count < 0); |
Joerg Roedel | d25797b | 2009-07-27 16:30:43 +0200 | [diff] [blame] | 768 | } |
Xiao Guangrong | 332b207 | 2011-05-15 23:20:27 +0800 | [diff] [blame] | 769 | kvm->arch.indirect_shadow_pages--; |
Marcelo Tosatti | 05da455 | 2008-02-23 11:44:30 -0300 | [diff] [blame] | 770 | } |
| 771 | |
Joerg Roedel | d25797b | 2009-07-27 16:30:43 +0200 | [diff] [blame] | 772 | static int has_wrprotected_page(struct kvm *kvm, |
| 773 | gfn_t gfn, |
| 774 | int level) |
Marcelo Tosatti | 05da455 | 2008-02-23 11:44:30 -0300 | [diff] [blame] | 775 | { |
Izik Eidus | 2843099 | 2008-10-03 17:40:32 +0300 | [diff] [blame] | 776 | struct kvm_memory_slot *slot; |
Takuya Yoshikawa | d4dbf47 | 2010-12-07 12:59:07 +0900 | [diff] [blame] | 777 | struct kvm_lpage_info *linfo; |
Marcelo Tosatti | 05da455 | 2008-02-23 11:44:30 -0300 | [diff] [blame] | 778 | |
Avi Kivity | a1f4d395 | 2010-06-21 11:44:20 +0300 | [diff] [blame] | 779 | slot = gfn_to_memslot(kvm, gfn); |
Marcelo Tosatti | 05da455 | 2008-02-23 11:44:30 -0300 | [diff] [blame] | 780 | if (slot) { |
Takuya Yoshikawa | d4dbf47 | 2010-12-07 12:59:07 +0900 | [diff] [blame] | 781 | linfo = lpage_info_slot(gfn, slot, level); |
| 782 | return linfo->write_count; |
Marcelo Tosatti | 05da455 | 2008-02-23 11:44:30 -0300 | [diff] [blame] | 783 | } |
| 784 | |
| 785 | return 1; |
| 786 | } |
| 787 | |
Joerg Roedel | d25797b | 2009-07-27 16:30:43 +0200 | [diff] [blame] | 788 | static int host_mapping_level(struct kvm *kvm, gfn_t gfn) |
Marcelo Tosatti | 05da455 | 2008-02-23 11:44:30 -0300 | [diff] [blame] | 789 | { |
Joerg Roedel | 8f0b1ab | 2010-01-28 12:37:56 +0100 | [diff] [blame] | 790 | unsigned long page_size; |
Joerg Roedel | d25797b | 2009-07-27 16:30:43 +0200 | [diff] [blame] | 791 | int i, ret = 0; |
Marcelo Tosatti | 05da455 | 2008-02-23 11:44:30 -0300 | [diff] [blame] | 792 | |
Joerg Roedel | 8f0b1ab | 2010-01-28 12:37:56 +0100 | [diff] [blame] | 793 | page_size = kvm_host_page_size(kvm, gfn); |
Marcelo Tosatti | 05da455 | 2008-02-23 11:44:30 -0300 | [diff] [blame] | 794 | |
Joerg Roedel | d25797b | 2009-07-27 16:30:43 +0200 | [diff] [blame] | 795 | for (i = PT_PAGE_TABLE_LEVEL; |
| 796 | i < (PT_PAGE_TABLE_LEVEL + KVM_NR_PAGE_SIZES); ++i) { |
| 797 | if (page_size >= KVM_HPAGE_SIZE(i)) |
| 798 | ret = i; |
| 799 | else |
| 800 | break; |
| 801 | } |
| 802 | |
Marcelo Tosatti | 4c2155c | 2008-09-16 20:54:47 -0300 | [diff] [blame] | 803 | return ret; |
Marcelo Tosatti | 05da455 | 2008-02-23 11:44:30 -0300 | [diff] [blame] | 804 | } |
| 805 | |
Xiao Guangrong | 5d163b1 | 2011-03-09 15:43:00 +0800 | [diff] [blame] | 806 | static struct kvm_memory_slot * |
| 807 | gfn_to_memslot_dirty_bitmap(struct kvm_vcpu *vcpu, gfn_t gfn, |
| 808 | bool no_dirty_log) |
Marcelo Tosatti | 05da455 | 2008-02-23 11:44:30 -0300 | [diff] [blame] | 809 | { |
| 810 | struct kvm_memory_slot *slot; |
Xiao Guangrong | 5d163b1 | 2011-03-09 15:43:00 +0800 | [diff] [blame] | 811 | |
| 812 | slot = gfn_to_memslot(vcpu->kvm, gfn); |
| 813 | if (!slot || slot->flags & KVM_MEMSLOT_INVALID || |
| 814 | (no_dirty_log && slot->dirty_bitmap)) |
| 815 | slot = NULL; |
| 816 | |
| 817 | return slot; |
| 818 | } |
| 819 | |
| 820 | static bool mapping_level_dirty_bitmap(struct kvm_vcpu *vcpu, gfn_t large_gfn) |
| 821 | { |
Steve | a0a8eab | 2011-06-17 10:25:39 +0800 | [diff] [blame] | 822 | return !gfn_to_memslot_dirty_bitmap(vcpu, large_gfn, true); |
Andrea Arcangeli | 936a5fe | 2011-01-13 15:46:48 -0800 | [diff] [blame] | 823 | } |
| 824 | |
| 825 | static int mapping_level(struct kvm_vcpu *vcpu, gfn_t large_gfn) |
| 826 | { |
| 827 | int host_level, level, max_level; |
Marcelo Tosatti | 05da455 | 2008-02-23 11:44:30 -0300 | [diff] [blame] | 828 | |
Joerg Roedel | d25797b | 2009-07-27 16:30:43 +0200 | [diff] [blame] | 829 | host_level = host_mapping_level(vcpu->kvm, large_gfn); |
| 830 | |
| 831 | if (host_level == PT_PAGE_TABLE_LEVEL) |
| 832 | return host_level; |
| 833 | |
Sheng Yang | 878403b | 2010-01-05 19:02:29 +0800 | [diff] [blame] | 834 | max_level = kvm_x86_ops->get_lpage_level() < host_level ? |
| 835 | kvm_x86_ops->get_lpage_level() : host_level; |
| 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 |
| 1108 | * spte writ-protection is caused by protecting shadow page table. |
| 1109 | * @flush indicates whether tlb need be flushed. |
| 1110 | * |
| 1111 | * Note: write protection is difference between drity logging and spte |
| 1112 | * protection: |
| 1113 | * - for dirty logging, the spte can be set to writable at anytime if |
| 1114 | * its dirty bitmap is properly set. |
| 1115 | * - for spte protection, the spte can be writable only after unsync-ing |
| 1116 | * shadow page. |
Xiao Guangrong | 8e22f95 | 2012-06-20 15:57:39 +0800 | [diff] [blame] | 1117 | * |
| 1118 | * Return true if the spte is dropped. |
| 1119 | */ |
Xiao Guangrong | 49fde34 | 2012-06-20 15:58:58 +0800 | [diff] [blame] | 1120 | static bool |
| 1121 | spte_write_protect(struct kvm *kvm, u64 *sptep, bool *flush, bool pt_protect) |
Xiao Guangrong | d13bc5b | 2012-06-20 15:57:15 +0800 | [diff] [blame] | 1122 | { |
| 1123 | u64 spte = *sptep; |
| 1124 | |
Xiao Guangrong | 49fde34 | 2012-06-20 15:58:58 +0800 | [diff] [blame] | 1125 | if (!is_writable_pte(spte) && |
| 1126 | !(pt_protect && spte_is_locklessly_modifiable(spte))) |
Xiao Guangrong | d13bc5b | 2012-06-20 15:57:15 +0800 | [diff] [blame] | 1127 | return false; |
| 1128 | |
| 1129 | rmap_printk("rmap_write_protect: spte %p %llx\n", sptep, *sptep); |
| 1130 | |
Xiao Guangrong | 49fde34 | 2012-06-20 15:58:58 +0800 | [diff] [blame] | 1131 | if (__drop_large_spte(kvm, sptep)) { |
| 1132 | *flush |= true; |
Xiao Guangrong | d13bc5b | 2012-06-20 15:57:15 +0800 | [diff] [blame] | 1133 | return true; |
Xiao Guangrong | 49fde34 | 2012-06-20 15:58:58 +0800 | [diff] [blame] | 1134 | } |
Xiao Guangrong | d13bc5b | 2012-06-20 15:57:15 +0800 | [diff] [blame] | 1135 | |
Xiao Guangrong | 49fde34 | 2012-06-20 15:58:58 +0800 | [diff] [blame] | 1136 | if (pt_protect) |
| 1137 | spte &= ~SPTE_MMU_WRITEABLE; |
Xiao Guangrong | d13bc5b | 2012-06-20 15:57:15 +0800 | [diff] [blame] | 1138 | spte = spte & ~PT_WRITABLE_MASK; |
Xiao Guangrong | 49fde34 | 2012-06-20 15:58:58 +0800 | [diff] [blame] | 1139 | |
| 1140 | *flush |= mmu_spte_update(sptep, spte); |
Xiao Guangrong | d13bc5b | 2012-06-20 15:57:15 +0800 | [diff] [blame] | 1141 | return false; |
| 1142 | } |
| 1143 | |
Xiao Guangrong | 49fde34 | 2012-06-20 15:58:58 +0800 | [diff] [blame] | 1144 | static bool __rmap_write_protect(struct kvm *kvm, unsigned long *rmapp, |
| 1145 | int level, bool pt_protect) |
Takuya Yoshikawa | a0ed460 | 2012-03-01 19:31:22 +0900 | [diff] [blame] | 1146 | { |
Takuya Yoshikawa | 1e3f42f | 2012-03-21 23:50:34 +0900 | [diff] [blame] | 1147 | u64 *sptep; |
| 1148 | struct rmap_iterator iter; |
Xiao Guangrong | d13bc5b | 2012-06-20 15:57:15 +0800 | [diff] [blame] | 1149 | bool flush = false; |
Takuya Yoshikawa | a0ed460 | 2012-03-01 19:31:22 +0900 | [diff] [blame] | 1150 | |
Takuya Yoshikawa | 1e3f42f | 2012-03-21 23:50:34 +0900 | [diff] [blame] | 1151 | for (sptep = rmap_get_first(*rmapp, &iter); sptep;) { |
| 1152 | BUG_ON(!(*sptep & PT_PRESENT_MASK)); |
Xiao Guangrong | 49fde34 | 2012-06-20 15:58:58 +0800 | [diff] [blame] | 1153 | if (spte_write_protect(kvm, sptep, &flush, pt_protect)) { |
Xiao Guangrong | d13bc5b | 2012-06-20 15:57:15 +0800 | [diff] [blame] | 1154 | sptep = rmap_get_first(*rmapp, &iter); |
Takuya Yoshikawa | a0ed460 | 2012-03-01 19:31:22 +0900 | [diff] [blame] | 1155 | continue; |
Takuya Yoshikawa | 1e3f42f | 2012-03-21 23:50:34 +0900 | [diff] [blame] | 1156 | } |
Takuya Yoshikawa | a0ed460 | 2012-03-01 19:31:22 +0900 | [diff] [blame] | 1157 | |
Xiao Guangrong | d13bc5b | 2012-06-20 15:57:15 +0800 | [diff] [blame] | 1158 | sptep = rmap_get_next(&iter); |
Takuya Yoshikawa | a0ed460 | 2012-03-01 19:31:22 +0900 | [diff] [blame] | 1159 | } |
| 1160 | |
Xiao Guangrong | d13bc5b | 2012-06-20 15:57:15 +0800 | [diff] [blame] | 1161 | return flush; |
Takuya Yoshikawa | a0ed460 | 2012-03-01 19:31:22 +0900 | [diff] [blame] | 1162 | } |
| 1163 | |
Takuya Yoshikawa | 5dc99b23 | 2012-03-01 19:32:16 +0900 | [diff] [blame] | 1164 | /** |
| 1165 | * kvm_mmu_write_protect_pt_masked - write protect selected PT level pages |
| 1166 | * @kvm: kvm instance |
| 1167 | * @slot: slot to protect |
| 1168 | * @gfn_offset: start of the BITS_PER_LONG pages we care about |
| 1169 | * @mask: indicates which pages we should protect |
| 1170 | * |
| 1171 | * Used when we do not need to care about huge page mappings: e.g. during dirty |
| 1172 | * logging we do not have any such mappings. |
| 1173 | */ |
| 1174 | void kvm_mmu_write_protect_pt_masked(struct kvm *kvm, |
| 1175 | struct kvm_memory_slot *slot, |
| 1176 | gfn_t gfn_offset, unsigned long mask) |
Izik Eidus | 98348e9 | 2007-10-16 14:42:30 +0200 | [diff] [blame] | 1177 | { |
Izik Eidus | 290fc38 | 2007-09-27 14:11:22 +0200 | [diff] [blame] | 1178 | unsigned long *rmapp; |
Takuya Yoshikawa | 5dc99b23 | 2012-03-01 19:32:16 +0900 | [diff] [blame] | 1179 | |
| 1180 | while (mask) { |
Takuya Yoshikawa | 65fbe37 | 2012-08-01 18:02:01 +0900 | [diff] [blame] | 1181 | rmapp = __gfn_to_rmap(slot->base_gfn + gfn_offset + __ffs(mask), |
| 1182 | PT_PAGE_TABLE_LEVEL, slot); |
Xiao Guangrong | 49fde34 | 2012-06-20 15:58:58 +0800 | [diff] [blame] | 1183 | __rmap_write_protect(kvm, rmapp, PT_PAGE_TABLE_LEVEL, false); |
Takuya Yoshikawa | 5dc99b23 | 2012-03-01 19:32:16 +0900 | [diff] [blame] | 1184 | |
| 1185 | /* clear the first set bit */ |
| 1186 | mask &= mask - 1; |
| 1187 | } |
| 1188 | } |
| 1189 | |
Xiao Guangrong | 2f84569 | 2012-06-20 15:56:53 +0800 | [diff] [blame] | 1190 | static bool rmap_write_protect(struct kvm *kvm, u64 gfn) |
Takuya Yoshikawa | 5dc99b23 | 2012-03-01 19:32:16 +0900 | [diff] [blame] | 1191 | { |
| 1192 | struct kvm_memory_slot *slot; |
| 1193 | unsigned long *rmapp; |
| 1194 | int i; |
Xiao Guangrong | 2f84569 | 2012-06-20 15:56:53 +0800 | [diff] [blame] | 1195 | bool write_protected = false; |
Takuya Yoshikawa | 5dc99b23 | 2012-03-01 19:32:16 +0900 | [diff] [blame] | 1196 | |
| 1197 | slot = gfn_to_memslot(kvm, gfn); |
Avi Kivity | 374cbac | 2007-01-05 16:36:43 -0800 | [diff] [blame] | 1198 | |
Takuya Yoshikawa | a0ed460 | 2012-03-01 19:31:22 +0900 | [diff] [blame] | 1199 | for (i = PT_PAGE_TABLE_LEVEL; |
Joerg Roedel | 44ad994 | 2009-07-27 16:30:42 +0200 | [diff] [blame] | 1200 | i < PT_PAGE_TABLE_LEVEL + KVM_NR_PAGE_SIZES; ++i) { |
Takuya Yoshikawa | 9373e2c0 | 2012-01-17 19:51:20 +0900 | [diff] [blame] | 1201 | rmapp = __gfn_to_rmap(gfn, i, slot); |
Xiao Guangrong | 49fde34 | 2012-06-20 15:58:58 +0800 | [diff] [blame] | 1202 | write_protected |= __rmap_write_protect(kvm, rmapp, i, true); |
Marcelo Tosatti | 05da455 | 2008-02-23 11:44:30 -0300 | [diff] [blame] | 1203 | } |
| 1204 | |
Marcelo Tosatti | b1a3682 | 2008-12-01 22:32:03 -0200 | [diff] [blame] | 1205 | return write_protected; |
Avi Kivity | 374cbac | 2007-01-05 16:36:43 -0800 | [diff] [blame] | 1206 | } |
| 1207 | |
Frederik Deweerdt | 8a8365c | 2009-10-09 11:42:56 +0000 | [diff] [blame] | 1208 | static int kvm_unmap_rmapp(struct kvm *kvm, unsigned long *rmapp, |
Takuya Yoshikawa | 048212d | 2012-07-02 17:57:59 +0900 | [diff] [blame] | 1209 | struct kvm_memory_slot *slot, unsigned long data) |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 1210 | { |
Takuya Yoshikawa | 1e3f42f | 2012-03-21 23:50:34 +0900 | [diff] [blame] | 1211 | u64 *sptep; |
| 1212 | struct rmap_iterator iter; |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 1213 | int need_tlb_flush = 0; |
| 1214 | |
Takuya Yoshikawa | 1e3f42f | 2012-03-21 23:50:34 +0900 | [diff] [blame] | 1215 | while ((sptep = rmap_get_first(*rmapp, &iter))) { |
| 1216 | BUG_ON(!(*sptep & PT_PRESENT_MASK)); |
| 1217 | rmap_printk("kvm_rmap_unmap_hva: spte %p %llx\n", sptep, *sptep); |
| 1218 | |
| 1219 | drop_spte(kvm, sptep); |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 1220 | need_tlb_flush = 1; |
| 1221 | } |
Takuya Yoshikawa | 1e3f42f | 2012-03-21 23:50:34 +0900 | [diff] [blame] | 1222 | |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 1223 | return need_tlb_flush; |
| 1224 | } |
| 1225 | |
Frederik Deweerdt | 8a8365c | 2009-10-09 11:42:56 +0000 | [diff] [blame] | 1226 | static int kvm_set_pte_rmapp(struct kvm *kvm, unsigned long *rmapp, |
Takuya Yoshikawa | 048212d | 2012-07-02 17:57:59 +0900 | [diff] [blame] | 1227 | struct kvm_memory_slot *slot, unsigned long data) |
Izik Eidus | 3da0dd4 | 2009-09-23 21:47:18 +0300 | [diff] [blame] | 1228 | { |
Takuya Yoshikawa | 1e3f42f | 2012-03-21 23:50:34 +0900 | [diff] [blame] | 1229 | u64 *sptep; |
| 1230 | struct rmap_iterator iter; |
Izik Eidus | 3da0dd4 | 2009-09-23 21:47:18 +0300 | [diff] [blame] | 1231 | int need_flush = 0; |
Takuya Yoshikawa | 1e3f42f | 2012-03-21 23:50:34 +0900 | [diff] [blame] | 1232 | u64 new_spte; |
Izik Eidus | 3da0dd4 | 2009-09-23 21:47:18 +0300 | [diff] [blame] | 1233 | pte_t *ptep = (pte_t *)data; |
| 1234 | pfn_t new_pfn; |
| 1235 | |
| 1236 | WARN_ON(pte_huge(*ptep)); |
| 1237 | new_pfn = pte_pfn(*ptep); |
Takuya Yoshikawa | 1e3f42f | 2012-03-21 23:50:34 +0900 | [diff] [blame] | 1238 | |
| 1239 | for (sptep = rmap_get_first(*rmapp, &iter); sptep;) { |
| 1240 | BUG_ON(!is_shadow_present_pte(*sptep)); |
| 1241 | rmap_printk("kvm_set_pte_rmapp: spte %p %llx\n", sptep, *sptep); |
| 1242 | |
Izik Eidus | 3da0dd4 | 2009-09-23 21:47:18 +0300 | [diff] [blame] | 1243 | need_flush = 1; |
Takuya Yoshikawa | 1e3f42f | 2012-03-21 23:50:34 +0900 | [diff] [blame] | 1244 | |
Izik Eidus | 3da0dd4 | 2009-09-23 21:47:18 +0300 | [diff] [blame] | 1245 | if (pte_write(*ptep)) { |
Takuya Yoshikawa | 1e3f42f | 2012-03-21 23:50:34 +0900 | [diff] [blame] | 1246 | drop_spte(kvm, sptep); |
| 1247 | sptep = rmap_get_first(*rmapp, &iter); |
Izik Eidus | 3da0dd4 | 2009-09-23 21:47:18 +0300 | [diff] [blame] | 1248 | } else { |
Takuya Yoshikawa | 1e3f42f | 2012-03-21 23:50:34 +0900 | [diff] [blame] | 1249 | new_spte = *sptep & ~PT64_BASE_ADDR_MASK; |
Izik Eidus | 3da0dd4 | 2009-09-23 21:47:18 +0300 | [diff] [blame] | 1250 | new_spte |= (u64)new_pfn << PAGE_SHIFT; |
| 1251 | |
| 1252 | new_spte &= ~PT_WRITABLE_MASK; |
| 1253 | new_spte &= ~SPTE_HOST_WRITEABLE; |
Avi Kivity | b79b93f | 2010-06-06 15:46:44 +0300 | [diff] [blame] | 1254 | new_spte &= ~shadow_accessed_mask; |
Takuya Yoshikawa | 1e3f42f | 2012-03-21 23:50:34 +0900 | [diff] [blame] | 1255 | |
| 1256 | mmu_spte_clear_track_bits(sptep); |
| 1257 | mmu_spte_set(sptep, new_spte); |
| 1258 | sptep = rmap_get_next(&iter); |
Izik Eidus | 3da0dd4 | 2009-09-23 21:47:18 +0300 | [diff] [blame] | 1259 | } |
| 1260 | } |
Takuya Yoshikawa | 1e3f42f | 2012-03-21 23:50:34 +0900 | [diff] [blame] | 1261 | |
Izik Eidus | 3da0dd4 | 2009-09-23 21:47:18 +0300 | [diff] [blame] | 1262 | if (need_flush) |
| 1263 | kvm_flush_remote_tlbs(kvm); |
| 1264 | |
| 1265 | return 0; |
| 1266 | } |
| 1267 | |
Takuya Yoshikawa | 84504ef | 2012-07-02 17:55:48 +0900 | [diff] [blame] | 1268 | static int kvm_handle_hva_range(struct kvm *kvm, |
| 1269 | unsigned long start, |
| 1270 | unsigned long end, |
| 1271 | unsigned long data, |
| 1272 | int (*handler)(struct kvm *kvm, |
| 1273 | unsigned long *rmapp, |
Takuya Yoshikawa | 048212d | 2012-07-02 17:57:59 +0900 | [diff] [blame] | 1274 | struct kvm_memory_slot *slot, |
Takuya Yoshikawa | 84504ef | 2012-07-02 17:55:48 +0900 | [diff] [blame] | 1275 | unsigned long data)) |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 1276 | { |
Xiao Guangrong | be6ba0f | 2011-11-24 17:39:18 +0800 | [diff] [blame] | 1277 | int j; |
Takuya Yoshikawa | f395302 | 2012-07-02 17:58:48 +0900 | [diff] [blame] | 1278 | int ret = 0; |
Marcelo Tosatti | bc6678a | 2009-12-23 14:35:21 -0200 | [diff] [blame] | 1279 | struct kvm_memslots *slots; |
Xiao Guangrong | be6ba0f | 2011-11-24 17:39:18 +0800 | [diff] [blame] | 1280 | struct kvm_memory_slot *memslot; |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 1281 | |
Lai Jiangshan | 90d83dc | 2010-04-19 17:41:23 +0800 | [diff] [blame] | 1282 | slots = kvm_memslots(kvm); |
Marcelo Tosatti | bc6678a | 2009-12-23 14:35:21 -0200 | [diff] [blame] | 1283 | |
Xiao Guangrong | be6ba0f | 2011-11-24 17:39:18 +0800 | [diff] [blame] | 1284 | kvm_for_each_memslot(memslot, slots) { |
Takuya Yoshikawa | 84504ef | 2012-07-02 17:55:48 +0900 | [diff] [blame] | 1285 | unsigned long hva_start, hva_end; |
Takuya Yoshikawa | bcd3ef5 | 2012-07-02 17:59:33 +0900 | [diff] [blame] | 1286 | gfn_t gfn_start, gfn_end; |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 1287 | |
Takuya Yoshikawa | 84504ef | 2012-07-02 17:55:48 +0900 | [diff] [blame] | 1288 | hva_start = max(start, memslot->userspace_addr); |
| 1289 | hva_end = min(end, memslot->userspace_addr + |
| 1290 | (memslot->npages << PAGE_SHIFT)); |
| 1291 | if (hva_start >= hva_end) |
| 1292 | continue; |
| 1293 | /* |
| 1294 | * {gfn(page) | page intersects with [hva_start, hva_end)} = |
Takuya Yoshikawa | bcd3ef5 | 2012-07-02 17:59:33 +0900 | [diff] [blame] | 1295 | * {gfn_start, gfn_start+1, ..., gfn_end-1}. |
Takuya Yoshikawa | 84504ef | 2012-07-02 17:55:48 +0900 | [diff] [blame] | 1296 | */ |
Takuya Yoshikawa | bcd3ef5 | 2012-07-02 17:59:33 +0900 | [diff] [blame] | 1297 | gfn_start = hva_to_gfn_memslot(hva_start, memslot); |
Takuya Yoshikawa | 84504ef | 2012-07-02 17:55:48 +0900 | [diff] [blame] | 1298 | gfn_end = hva_to_gfn_memslot(hva_end + PAGE_SIZE - 1, memslot); |
Joerg Roedel | 852e3c1 | 2009-07-27 16:30:44 +0200 | [diff] [blame] | 1299 | |
Takuya Yoshikawa | bcd3ef5 | 2012-07-02 17:59:33 +0900 | [diff] [blame] | 1300 | for (j = PT_PAGE_TABLE_LEVEL; |
| 1301 | j < PT_PAGE_TABLE_LEVEL + KVM_NR_PAGE_SIZES; ++j) { |
| 1302 | unsigned long idx, idx_end; |
| 1303 | unsigned long *rmapp; |
Joerg Roedel | 852e3c1 | 2009-07-27 16:30:44 +0200 | [diff] [blame] | 1304 | |
Takuya Yoshikawa | bcd3ef5 | 2012-07-02 17:59:33 +0900 | [diff] [blame] | 1305 | /* |
| 1306 | * {idx(page_j) | page_j intersects with |
| 1307 | * [hva_start, hva_end)} = {idx, idx+1, ..., idx_end}. |
| 1308 | */ |
| 1309 | idx = gfn_to_index(gfn_start, memslot->base_gfn, j); |
| 1310 | idx_end = gfn_to_index(gfn_end - 1, memslot->base_gfn, j); |
Andrea Arcangeli | 6e3e243 | 2010-07-16 11:52:55 +0200 | [diff] [blame] | 1311 | |
Takuya Yoshikawa | bcd3ef5 | 2012-07-02 17:59:33 +0900 | [diff] [blame] | 1312 | rmapp = __gfn_to_rmap(gfn_start, j, memslot); |
| 1313 | |
| 1314 | for (; idx <= idx_end; ++idx) |
| 1315 | ret |= handler(kvm, rmapp++, memslot, data); |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 1316 | } |
| 1317 | } |
| 1318 | |
Takuya Yoshikawa | f395302 | 2012-07-02 17:58:48 +0900 | [diff] [blame] | 1319 | return ret; |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 1320 | } |
| 1321 | |
Takuya Yoshikawa | 84504ef | 2012-07-02 17:55:48 +0900 | [diff] [blame] | 1322 | static int kvm_handle_hva(struct kvm *kvm, unsigned long hva, |
| 1323 | unsigned long data, |
| 1324 | int (*handler)(struct kvm *kvm, unsigned long *rmapp, |
Takuya Yoshikawa | 048212d | 2012-07-02 17:57:59 +0900 | [diff] [blame] | 1325 | struct kvm_memory_slot *slot, |
Takuya Yoshikawa | 84504ef | 2012-07-02 17:55:48 +0900 | [diff] [blame] | 1326 | unsigned long data)) |
| 1327 | { |
| 1328 | return kvm_handle_hva_range(kvm, hva, hva + 1, data, handler); |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 1329 | } |
| 1330 | |
| 1331 | int kvm_unmap_hva(struct kvm *kvm, unsigned long hva) |
| 1332 | { |
Izik Eidus | 3da0dd4 | 2009-09-23 21:47:18 +0300 | [diff] [blame] | 1333 | return kvm_handle_hva(kvm, hva, 0, kvm_unmap_rmapp); |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 1334 | } |
| 1335 | |
Takuya Yoshikawa | b3ae209 | 2012-07-02 17:56:33 +0900 | [diff] [blame] | 1336 | int kvm_unmap_hva_range(struct kvm *kvm, unsigned long start, unsigned long end) |
| 1337 | { |
| 1338 | return kvm_handle_hva_range(kvm, start, end, 0, kvm_unmap_rmapp); |
| 1339 | } |
| 1340 | |
Izik Eidus | 3da0dd4 | 2009-09-23 21:47:18 +0300 | [diff] [blame] | 1341 | void kvm_set_spte_hva(struct kvm *kvm, unsigned long hva, pte_t pte) |
| 1342 | { |
Frederik Deweerdt | 8a8365c | 2009-10-09 11:42:56 +0000 | [diff] [blame] | 1343 | kvm_handle_hva(kvm, hva, (unsigned long)&pte, kvm_set_pte_rmapp); |
Izik Eidus | 3da0dd4 | 2009-09-23 21:47:18 +0300 | [diff] [blame] | 1344 | } |
| 1345 | |
Frederik Deweerdt | 8a8365c | 2009-10-09 11:42:56 +0000 | [diff] [blame] | 1346 | static int kvm_age_rmapp(struct kvm *kvm, unsigned long *rmapp, |
Takuya Yoshikawa | 048212d | 2012-07-02 17:57:59 +0900 | [diff] [blame] | 1347 | struct kvm_memory_slot *slot, unsigned long data) |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 1348 | { |
Takuya Yoshikawa | 1e3f42f | 2012-03-21 23:50:34 +0900 | [diff] [blame] | 1349 | u64 *sptep; |
Michael S. Tsirkin | 79f702a | 2012-06-03 11:34:08 +0300 | [diff] [blame] | 1350 | struct rmap_iterator uninitialized_var(iter); |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 1351 | int young = 0; |
| 1352 | |
Rik van Riel | 6316e1c | 2010-02-03 16:11:03 -0500 | [diff] [blame] | 1353 | /* |
Xudong Hao | 3f6d8c8 | 2012-05-22 11:23:15 +0800 | [diff] [blame] | 1354 | * In case of absence of EPT Access and Dirty Bits supports, |
| 1355 | * 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] | 1356 | * an EPT mapping, and clearing it if it does. On the next access, |
| 1357 | * a new EPT mapping will be established. |
| 1358 | * This has some overhead, but not as much as the cost of swapping |
| 1359 | * out actively used pages or breaking up actively used hugepages. |
| 1360 | */ |
Takuya Yoshikawa | f395302 | 2012-07-02 17:58:48 +0900 | [diff] [blame] | 1361 | if (!shadow_accessed_mask) { |
| 1362 | young = kvm_unmap_rmapp(kvm, rmapp, slot, data); |
| 1363 | goto out; |
| 1364 | } |
Sheng Yang | 534e38b | 2008-09-08 15:12:30 +0800 | [diff] [blame] | 1365 | |
Takuya Yoshikawa | 1e3f42f | 2012-03-21 23:50:34 +0900 | [diff] [blame] | 1366 | for (sptep = rmap_get_first(*rmapp, &iter); sptep; |
| 1367 | sptep = rmap_get_next(&iter)) { |
Xudong Hao | 3f6d8c8 | 2012-05-22 11:23:15 +0800 | [diff] [blame] | 1368 | BUG_ON(!is_shadow_present_pte(*sptep)); |
Takuya Yoshikawa | 1e3f42f | 2012-03-21 23:50:34 +0900 | [diff] [blame] | 1369 | |
Xudong Hao | 3f6d8c8 | 2012-05-22 11:23:15 +0800 | [diff] [blame] | 1370 | if (*sptep & shadow_accessed_mask) { |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 1371 | young = 1; |
Xudong Hao | 3f6d8c8 | 2012-05-22 11:23:15 +0800 | [diff] [blame] | 1372 | clear_bit((ffs(shadow_accessed_mask) - 1), |
| 1373 | (unsigned long *)sptep); |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 1374 | } |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 1375 | } |
Takuya Yoshikawa | f395302 | 2012-07-02 17:58:48 +0900 | [diff] [blame] | 1376 | out: |
| 1377 | /* @data has hva passed to kvm_age_hva(). */ |
| 1378 | trace_kvm_age_page(data, slot, young); |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 1379 | return young; |
| 1380 | } |
| 1381 | |
Andrea Arcangeli | 8ee5382 | 2011-01-13 15:47:10 -0800 | [diff] [blame] | 1382 | static int kvm_test_age_rmapp(struct kvm *kvm, unsigned long *rmapp, |
Takuya Yoshikawa | 048212d | 2012-07-02 17:57:59 +0900 | [diff] [blame] | 1383 | struct kvm_memory_slot *slot, unsigned long data) |
Andrea Arcangeli | 8ee5382 | 2011-01-13 15:47:10 -0800 | [diff] [blame] | 1384 | { |
Takuya Yoshikawa | 1e3f42f | 2012-03-21 23:50:34 +0900 | [diff] [blame] | 1385 | u64 *sptep; |
| 1386 | struct rmap_iterator iter; |
Andrea Arcangeli | 8ee5382 | 2011-01-13 15:47:10 -0800 | [diff] [blame] | 1387 | int young = 0; |
| 1388 | |
| 1389 | /* |
| 1390 | * If there's no access bit in the secondary pte set by the |
| 1391 | * hardware it's up to gup-fast/gup to set the access bit in |
| 1392 | * the primary pte or in the page structure. |
| 1393 | */ |
| 1394 | if (!shadow_accessed_mask) |
| 1395 | goto out; |
| 1396 | |
Takuya Yoshikawa | 1e3f42f | 2012-03-21 23:50:34 +0900 | [diff] [blame] | 1397 | for (sptep = rmap_get_first(*rmapp, &iter); sptep; |
| 1398 | sptep = rmap_get_next(&iter)) { |
Xudong Hao | 3f6d8c8 | 2012-05-22 11:23:15 +0800 | [diff] [blame] | 1399 | BUG_ON(!is_shadow_present_pte(*sptep)); |
Takuya Yoshikawa | 1e3f42f | 2012-03-21 23:50:34 +0900 | [diff] [blame] | 1400 | |
Xudong Hao | 3f6d8c8 | 2012-05-22 11:23:15 +0800 | [diff] [blame] | 1401 | if (*sptep & shadow_accessed_mask) { |
Andrea Arcangeli | 8ee5382 | 2011-01-13 15:47:10 -0800 | [diff] [blame] | 1402 | young = 1; |
| 1403 | break; |
| 1404 | } |
Andrea Arcangeli | 8ee5382 | 2011-01-13 15:47:10 -0800 | [diff] [blame] | 1405 | } |
| 1406 | out: |
| 1407 | return young; |
| 1408 | } |
| 1409 | |
Marcelo Tosatti | 53a27b3 | 2009-08-05 15:43:58 -0300 | [diff] [blame] | 1410 | #define RMAP_RECYCLE_THRESHOLD 1000 |
| 1411 | |
Joerg Roedel | 852e3c1 | 2009-07-27 16:30:44 +0200 | [diff] [blame] | 1412 | 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] | 1413 | { |
| 1414 | unsigned long *rmapp; |
Joerg Roedel | 852e3c1 | 2009-07-27 16:30:44 +0200 | [diff] [blame] | 1415 | struct kvm_mmu_page *sp; |
| 1416 | |
| 1417 | sp = page_header(__pa(spte)); |
Marcelo Tosatti | 53a27b3 | 2009-08-05 15:43:58 -0300 | [diff] [blame] | 1418 | |
Joerg Roedel | 852e3c1 | 2009-07-27 16:30:44 +0200 | [diff] [blame] | 1419 | rmapp = gfn_to_rmap(vcpu->kvm, gfn, sp->role.level); |
Marcelo Tosatti | 53a27b3 | 2009-08-05 15:43:58 -0300 | [diff] [blame] | 1420 | |
Takuya Yoshikawa | 048212d | 2012-07-02 17:57:59 +0900 | [diff] [blame] | 1421 | kvm_unmap_rmapp(vcpu->kvm, rmapp, NULL, 0); |
Marcelo Tosatti | 53a27b3 | 2009-08-05 15:43:58 -0300 | [diff] [blame] | 1422 | kvm_flush_remote_tlbs(vcpu->kvm); |
| 1423 | } |
| 1424 | |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 1425 | int kvm_age_hva(struct kvm *kvm, unsigned long hva) |
| 1426 | { |
Takuya Yoshikawa | f395302 | 2012-07-02 17:58:48 +0900 | [diff] [blame] | 1427 | return kvm_handle_hva(kvm, hva, hva, kvm_age_rmapp); |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 1428 | } |
| 1429 | |
Andrea Arcangeli | 8ee5382 | 2011-01-13 15:47:10 -0800 | [diff] [blame] | 1430 | int kvm_test_age_hva(struct kvm *kvm, unsigned long hva) |
| 1431 | { |
| 1432 | return kvm_handle_hva(kvm, hva, 0, kvm_test_age_rmapp); |
| 1433 | } |
| 1434 | |
Yaozu Dong | d6c69ee | 2007-04-25 14:17:25 +0800 | [diff] [blame] | 1435 | #ifdef MMU_DEBUG |
Avi Kivity | 47ad8e6 | 2007-05-06 15:50:58 +0300 | [diff] [blame] | 1436 | static int is_empty_shadow_page(u64 *spt) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1437 | { |
Avi Kivity | 139bdb2 | 2007-01-05 16:36:50 -0800 | [diff] [blame] | 1438 | u64 *pos; |
| 1439 | u64 *end; |
| 1440 | |
Avi Kivity | 47ad8e6 | 2007-05-06 15:50:58 +0300 | [diff] [blame] | 1441 | for (pos = spt, end = pos + PAGE_SIZE / sizeof(u64); pos != end; pos++) |
Avi Kivity | 3c91551 | 2008-05-20 16:21:13 +0300 | [diff] [blame] | 1442 | if (is_shadow_present_pte(*pos)) { |
Harvey Harrison | b8688d5 | 2008-03-03 12:59:56 -0800 | [diff] [blame] | 1443 | printk(KERN_ERR "%s: %p %llx\n", __func__, |
Avi Kivity | 139bdb2 | 2007-01-05 16:36:50 -0800 | [diff] [blame] | 1444 | pos, *pos); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1445 | return 0; |
Avi Kivity | 139bdb2 | 2007-01-05 16:36:50 -0800 | [diff] [blame] | 1446 | } |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1447 | return 1; |
| 1448 | } |
Yaozu Dong | d6c69ee | 2007-04-25 14:17:25 +0800 | [diff] [blame] | 1449 | #endif |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1450 | |
Dave Hansen | 45221ab | 2010-08-19 18:11:37 -0700 | [diff] [blame] | 1451 | /* |
| 1452 | * This value is the sum of all of the kvm instances's |
| 1453 | * kvm->arch.n_used_mmu_pages values. We need a global, |
| 1454 | * aggregate version in order to make the slab shrinker |
| 1455 | * faster |
| 1456 | */ |
| 1457 | static inline void kvm_mod_used_mmu_pages(struct kvm *kvm, int nr) |
| 1458 | { |
| 1459 | kvm->arch.n_used_mmu_pages += nr; |
| 1460 | percpu_counter_add(&kvm_total_used_mmu_pages, nr); |
| 1461 | } |
| 1462 | |
Xiao Guangrong | bd4c86e | 2011-07-12 03:27:14 +0800 | [diff] [blame] | 1463 | /* |
| 1464 | * Remove the sp from shadow page cache, after call it, |
| 1465 | * we can not find this sp from the cache, and the shadow |
| 1466 | * page table is still valid. |
| 1467 | * It should be under the protection of mmu lock. |
| 1468 | */ |
| 1469 | static void kvm_mmu_isolate_page(struct kvm_mmu_page *sp) |
Avi Kivity | 260746c | 2007-01-05 16:36:49 -0800 | [diff] [blame] | 1470 | { |
Avi Kivity | 4db3531 | 2007-11-21 15:28:32 +0200 | [diff] [blame] | 1471 | ASSERT(is_empty_shadow_page(sp->spt)); |
Xiao Guangrong | 7775834 | 2010-06-04 21:53:54 +0800 | [diff] [blame] | 1472 | hlist_del(&sp->hash_link); |
Lai Jiangshan | 2032a93 | 2010-05-26 16:49:59 +0800 | [diff] [blame] | 1473 | if (!sp->role.direct) |
Xiao Guangrong | 842f22e | 2011-03-04 19:01:10 +0800 | [diff] [blame] | 1474 | free_page((unsigned long)sp->gfns); |
Xiao Guangrong | bd4c86e | 2011-07-12 03:27:14 +0800 | [diff] [blame] | 1475 | } |
| 1476 | |
| 1477 | /* |
| 1478 | * Free the shadow page table and the sp, we can do it |
| 1479 | * out of the protection of mmu lock. |
| 1480 | */ |
| 1481 | static void kvm_mmu_free_page(struct kvm_mmu_page *sp) |
| 1482 | { |
| 1483 | list_del(&sp->link); |
| 1484 | free_page((unsigned long)sp->spt); |
Xiao Guangrong | e8ad9a7 | 2010-05-13 10:06:02 +0800 | [diff] [blame] | 1485 | kmem_cache_free(mmu_page_header_cache, sp); |
Avi Kivity | 260746c | 2007-01-05 16:36:49 -0800 | [diff] [blame] | 1486 | } |
| 1487 | |
Avi Kivity | cea0f0e | 2007-01-05 16:36:43 -0800 | [diff] [blame] | 1488 | static unsigned kvm_page_table_hashfn(gfn_t gfn) |
| 1489 | { |
Dong, Eddie | 1ae0a13 | 2008-01-07 13:20:25 +0200 | [diff] [blame] | 1490 | return gfn & ((1 << KVM_MMU_HASH_SHIFT) - 1); |
Avi Kivity | cea0f0e | 2007-01-05 16:36:43 -0800 | [diff] [blame] | 1491 | } |
| 1492 | |
Xiao Guangrong | 67052b3 | 2011-05-15 23:27:08 +0800 | [diff] [blame] | 1493 | static void mmu_page_add_parent_pte(struct kvm_vcpu *vcpu, |
| 1494 | struct kvm_mmu_page *sp, u64 *parent_pte) |
| 1495 | { |
| 1496 | if (!parent_pte) |
| 1497 | return; |
| 1498 | |
| 1499 | pte_list_add(vcpu, parent_pte, &sp->parent_ptes); |
| 1500 | } |
| 1501 | |
| 1502 | static void mmu_page_remove_parent_pte(struct kvm_mmu_page *sp, |
| 1503 | u64 *parent_pte) |
| 1504 | { |
| 1505 | pte_list_remove(parent_pte, &sp->parent_ptes); |
| 1506 | } |
| 1507 | |
Xiao Guangrong | bcdd9a9 | 2011-05-15 23:28:29 +0800 | [diff] [blame] | 1508 | static void drop_parent_pte(struct kvm_mmu_page *sp, |
| 1509 | u64 *parent_pte) |
| 1510 | { |
| 1511 | mmu_page_remove_parent_pte(sp, parent_pte); |
Xiao Guangrong | 1df9f2d | 2011-07-12 03:30:35 +0800 | [diff] [blame] | 1512 | mmu_spte_clear_no_track(parent_pte); |
Xiao Guangrong | bcdd9a9 | 2011-05-15 23:28:29 +0800 | [diff] [blame] | 1513 | } |
| 1514 | |
Avi Kivity | 25c0de2 | 2007-01-05 16:36:42 -0800 | [diff] [blame] | 1515 | 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] | 1516 | u64 *parent_pte, int direct) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1517 | { |
Avi Kivity | 4db3531 | 2007-11-21 15:28:32 +0200 | [diff] [blame] | 1518 | struct kvm_mmu_page *sp; |
Takuya Yoshikawa | 80feb89 | 2012-05-29 23:54:26 +0900 | [diff] [blame] | 1519 | sp = mmu_memory_cache_alloc(&vcpu->arch.mmu_page_header_cache); |
| 1520 | sp->spt = mmu_memory_cache_alloc(&vcpu->arch.mmu_page_cache); |
Lai Jiangshan | 2032a93 | 2010-05-26 16:49:59 +0800 | [diff] [blame] | 1521 | if (!direct) |
Takuya Yoshikawa | 80feb89 | 2012-05-29 23:54:26 +0900 | [diff] [blame] | 1522 | sp->gfns = mmu_memory_cache_alloc(&vcpu->arch.mmu_page_cache); |
Avi Kivity | 4db3531 | 2007-11-21 15:28:32 +0200 | [diff] [blame] | 1523 | set_page_private(virt_to_page(sp->spt), (unsigned long)sp); |
Zhang Xiantao | f05e70a | 2007-12-14 10:01:48 +0800 | [diff] [blame] | 1524 | list_add(&sp->link, &vcpu->kvm->arch.active_mmu_pages); |
Xiao Guangrong | 93a5cef | 2011-11-24 17:37:48 +0800 | [diff] [blame] | 1525 | bitmap_zero(sp->slot_bitmap, KVM_MEM_SLOTS_NUM); |
Xiao Guangrong | 67052b3 | 2011-05-15 23:27:08 +0800 | [diff] [blame] | 1526 | sp->parent_ptes = 0; |
| 1527 | mmu_page_add_parent_pte(vcpu, sp, parent_pte); |
Dave Hansen | 45221ab | 2010-08-19 18:11:37 -0700 | [diff] [blame] | 1528 | kvm_mod_used_mmu_pages(vcpu->kvm, +1); |
Avi Kivity | 4db3531 | 2007-11-21 15:28:32 +0200 | [diff] [blame] | 1529 | return sp; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1530 | } |
| 1531 | |
Xiao Guangrong | 67052b3 | 2011-05-15 23:27:08 +0800 | [diff] [blame] | 1532 | static void mark_unsync(u64 *spte); |
Xiao Guangrong | 6b18493 | 2010-04-16 21:29:17 +0800 | [diff] [blame] | 1533 | static void kvm_mmu_mark_parents_unsync(struct kvm_mmu_page *sp) |
Marcelo Tosatti | 0074ff6 | 2008-09-23 13:18:40 -0300 | [diff] [blame] | 1534 | { |
Xiao Guangrong | 67052b3 | 2011-05-15 23:27:08 +0800 | [diff] [blame] | 1535 | pte_list_walk(&sp->parent_ptes, mark_unsync); |
Xiao Guangrong | 1047df1 | 2010-06-11 21:35:15 +0800 | [diff] [blame] | 1536 | } |
| 1537 | |
Xiao Guangrong | 67052b3 | 2011-05-15 23:27:08 +0800 | [diff] [blame] | 1538 | static void mark_unsync(u64 *spte) |
Xiao Guangrong | 1047df1 | 2010-06-11 21:35:15 +0800 | [diff] [blame] | 1539 | { |
Xiao Guangrong | 67052b3 | 2011-05-15 23:27:08 +0800 | [diff] [blame] | 1540 | struct kvm_mmu_page *sp; |
Xiao Guangrong | 1047df1 | 2010-06-11 21:35:15 +0800 | [diff] [blame] | 1541 | unsigned int index; |
| 1542 | |
Xiao Guangrong | 67052b3 | 2011-05-15 23:27:08 +0800 | [diff] [blame] | 1543 | sp = page_header(__pa(spte)); |
Xiao Guangrong | 1047df1 | 2010-06-11 21:35:15 +0800 | [diff] [blame] | 1544 | index = spte - sp->spt; |
| 1545 | if (__test_and_set_bit(index, sp->unsync_child_bitmap)) |
| 1546 | return; |
| 1547 | if (sp->unsync_children++) |
| 1548 | return; |
| 1549 | kvm_mmu_mark_parents_unsync(sp); |
Marcelo Tosatti | 0074ff6 | 2008-09-23 13:18:40 -0300 | [diff] [blame] | 1550 | } |
| 1551 | |
Marcelo Tosatti | e8bc217 | 2008-09-23 13:18:33 -0300 | [diff] [blame] | 1552 | static int nonpaging_sync_page(struct kvm_vcpu *vcpu, |
Xiao Guangrong | a4a8e6f | 2010-11-19 17:04:03 +0800 | [diff] [blame] | 1553 | struct kvm_mmu_page *sp) |
Marcelo Tosatti | e8bc217 | 2008-09-23 13:18:33 -0300 | [diff] [blame] | 1554 | { |
| 1555 | return 1; |
| 1556 | } |
| 1557 | |
Marcelo Tosatti | a705289 | 2008-09-23 13:18:35 -0300 | [diff] [blame] | 1558 | static void nonpaging_invlpg(struct kvm_vcpu *vcpu, gva_t gva) |
| 1559 | { |
| 1560 | } |
| 1561 | |
Xiao Guangrong | 0f53b5b | 2011-03-09 15:43:51 +0800 | [diff] [blame] | 1562 | static void nonpaging_update_pte(struct kvm_vcpu *vcpu, |
| 1563 | struct kvm_mmu_page *sp, u64 *spte, |
Xiao Guangrong | 7c56252 | 2011-03-28 10:29:27 +0800 | [diff] [blame] | 1564 | const void *pte) |
Xiao Guangrong | 0f53b5b | 2011-03-09 15:43:51 +0800 | [diff] [blame] | 1565 | { |
| 1566 | WARN_ON(1); |
| 1567 | } |
| 1568 | |
Marcelo Tosatti | 60c8aec | 2008-12-01 22:32:02 -0200 | [diff] [blame] | 1569 | #define KVM_PAGE_ARRAY_NR 16 |
| 1570 | |
| 1571 | struct kvm_mmu_pages { |
| 1572 | struct mmu_page_and_offset { |
| 1573 | struct kvm_mmu_page *sp; |
| 1574 | unsigned int idx; |
| 1575 | } page[KVM_PAGE_ARRAY_NR]; |
| 1576 | unsigned int nr; |
| 1577 | }; |
| 1578 | |
Hannes Eder | cded19f | 2009-02-21 02:19:13 +0100 | [diff] [blame] | 1579 | static int mmu_pages_add(struct kvm_mmu_pages *pvec, struct kvm_mmu_page *sp, |
| 1580 | int idx) |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 1581 | { |
Marcelo Tosatti | 60c8aec | 2008-12-01 22:32:02 -0200 | [diff] [blame] | 1582 | int i; |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 1583 | |
Marcelo Tosatti | 60c8aec | 2008-12-01 22:32:02 -0200 | [diff] [blame] | 1584 | if (sp->unsync) |
| 1585 | for (i=0; i < pvec->nr; i++) |
| 1586 | if (pvec->page[i].sp == sp) |
| 1587 | return 0; |
| 1588 | |
| 1589 | pvec->page[pvec->nr].sp = sp; |
| 1590 | pvec->page[pvec->nr].idx = idx; |
| 1591 | pvec->nr++; |
| 1592 | return (pvec->nr == KVM_PAGE_ARRAY_NR); |
| 1593 | } |
| 1594 | |
| 1595 | static int __mmu_unsync_walk(struct kvm_mmu_page *sp, |
| 1596 | struct kvm_mmu_pages *pvec) |
| 1597 | { |
| 1598 | int i, ret, nr_unsync_leaf = 0; |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 1599 | |
Takuya Yoshikawa | 37178b8 | 2011-11-29 14:02:45 +0900 | [diff] [blame] | 1600 | for_each_set_bit(i, sp->unsync_child_bitmap, 512) { |
Xiao Guangrong | 7a8f1a7 | 2010-06-11 21:34:04 +0800 | [diff] [blame] | 1601 | struct kvm_mmu_page *child; |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 1602 | u64 ent = sp->spt[i]; |
| 1603 | |
Xiao Guangrong | 7a8f1a7 | 2010-06-11 21:34:04 +0800 | [diff] [blame] | 1604 | if (!is_shadow_present_pte(ent) || is_large_pte(ent)) |
| 1605 | goto clear_child_bitmap; |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 1606 | |
Xiao Guangrong | 7a8f1a7 | 2010-06-11 21:34:04 +0800 | [diff] [blame] | 1607 | child = page_header(ent & PT64_BASE_ADDR_MASK); |
Marcelo Tosatti | 60c8aec | 2008-12-01 22:32:02 -0200 | [diff] [blame] | 1608 | |
Xiao Guangrong | 7a8f1a7 | 2010-06-11 21:34:04 +0800 | [diff] [blame] | 1609 | if (child->unsync_children) { |
| 1610 | if (mmu_pages_add(pvec, child, i)) |
| 1611 | return -ENOSPC; |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 1612 | |
Xiao Guangrong | 7a8f1a7 | 2010-06-11 21:34:04 +0800 | [diff] [blame] | 1613 | ret = __mmu_unsync_walk(child, pvec); |
| 1614 | if (!ret) |
| 1615 | goto clear_child_bitmap; |
| 1616 | else if (ret > 0) |
| 1617 | nr_unsync_leaf += ret; |
| 1618 | else |
| 1619 | return ret; |
| 1620 | } else if (child->unsync) { |
| 1621 | nr_unsync_leaf++; |
| 1622 | if (mmu_pages_add(pvec, child, i)) |
| 1623 | return -ENOSPC; |
| 1624 | } else |
| 1625 | goto clear_child_bitmap; |
| 1626 | |
| 1627 | continue; |
| 1628 | |
| 1629 | clear_child_bitmap: |
| 1630 | __clear_bit(i, sp->unsync_child_bitmap); |
| 1631 | sp->unsync_children--; |
| 1632 | WARN_ON((int)sp->unsync_children < 0); |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 1633 | } |
| 1634 | |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 1635 | |
Marcelo Tosatti | 60c8aec | 2008-12-01 22:32:02 -0200 | [diff] [blame] | 1636 | return nr_unsync_leaf; |
| 1637 | } |
| 1638 | |
| 1639 | static int mmu_unsync_walk(struct kvm_mmu_page *sp, |
| 1640 | struct kvm_mmu_pages *pvec) |
| 1641 | { |
| 1642 | if (!sp->unsync_children) |
| 1643 | return 0; |
| 1644 | |
| 1645 | mmu_pages_add(pvec, sp, 0); |
| 1646 | return __mmu_unsync_walk(sp, pvec); |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 1647 | } |
| 1648 | |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 1649 | static void kvm_unlink_unsync_page(struct kvm *kvm, struct kvm_mmu_page *sp) |
| 1650 | { |
| 1651 | WARN_ON(!sp->unsync); |
Xiao Guangrong | 5e1b3dd | 2010-04-28 11:55:06 +0800 | [diff] [blame] | 1652 | trace_kvm_mmu_sync_page(sp); |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 1653 | sp->unsync = 0; |
| 1654 | --kvm->stat.mmu_unsync; |
| 1655 | } |
| 1656 | |
Xiao Guangrong | 7775834 | 2010-06-04 21:53:54 +0800 | [diff] [blame] | 1657 | static int kvm_mmu_prepare_zap_page(struct kvm *kvm, struct kvm_mmu_page *sp, |
| 1658 | struct list_head *invalid_list); |
| 1659 | static void kvm_mmu_commit_zap_page(struct kvm *kvm, |
| 1660 | struct list_head *invalid_list); |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 1661 | |
Xiao Guangrong | f41d335 | 2010-06-04 21:56:11 +0800 | [diff] [blame] | 1662 | #define for_each_gfn_sp(kvm, sp, gfn, pos) \ |
| 1663 | hlist_for_each_entry(sp, pos, \ |
Xiao Guangrong | 7ae680e | 2010-06-04 21:53:07 +0800 | [diff] [blame] | 1664 | &(kvm)->arch.mmu_page_hash[kvm_page_table_hashfn(gfn)], hash_link) \ |
| 1665 | if ((sp)->gfn != (gfn)) {} else |
| 1666 | |
Xiao Guangrong | f41d335 | 2010-06-04 21:56:11 +0800 | [diff] [blame] | 1667 | #define for_each_gfn_indirect_valid_sp(kvm, sp, gfn, pos) \ |
| 1668 | hlist_for_each_entry(sp, pos, \ |
Xiao Guangrong | 7ae680e | 2010-06-04 21:53:07 +0800 | [diff] [blame] | 1669 | &(kvm)->arch.mmu_page_hash[kvm_page_table_hashfn(gfn)], hash_link) \ |
| 1670 | if ((sp)->gfn != (gfn) || (sp)->role.direct || \ |
| 1671 | (sp)->role.invalid) {} else |
| 1672 | |
Xiao Guangrong | f918b44 | 2010-06-11 21:30:36 +0800 | [diff] [blame] | 1673 | /* @sp->gfn should be write-protected at the call site */ |
Xiao Guangrong | 1d9dc7e | 2010-05-15 18:51:24 +0800 | [diff] [blame] | 1674 | 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] | 1675 | struct list_head *invalid_list, bool clear_unsync) |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 1676 | { |
Avi Kivity | 5b7e010 | 2010-04-14 19:20:03 +0300 | [diff] [blame] | 1677 | if (sp->role.cr4_pae != !!is_pae(vcpu)) { |
Xiao Guangrong | d98ba05 | 2010-06-04 21:55:29 +0800 | [diff] [blame] | 1678 | kvm_mmu_prepare_zap_page(vcpu->kvm, sp, invalid_list); |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 1679 | return 1; |
| 1680 | } |
| 1681 | |
Xiao Guangrong | f918b44 | 2010-06-11 21:30:36 +0800 | [diff] [blame] | 1682 | if (clear_unsync) |
Xiao Guangrong | 1d9dc7e | 2010-05-15 18:51:24 +0800 | [diff] [blame] | 1683 | kvm_unlink_unsync_page(vcpu->kvm, sp); |
Xiao Guangrong | 1d9dc7e | 2010-05-15 18:51:24 +0800 | [diff] [blame] | 1684 | |
Xiao Guangrong | a4a8e6f | 2010-11-19 17:04:03 +0800 | [diff] [blame] | 1685 | if (vcpu->arch.mmu.sync_page(vcpu, sp)) { |
Xiao Guangrong | d98ba05 | 2010-06-04 21:55:29 +0800 | [diff] [blame] | 1686 | kvm_mmu_prepare_zap_page(vcpu->kvm, sp, invalid_list); |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 1687 | return 1; |
| 1688 | } |
| 1689 | |
| 1690 | kvm_mmu_flush_tlb(vcpu); |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 1691 | return 0; |
| 1692 | } |
| 1693 | |
Xiao Guangrong | 1d9dc7e | 2010-05-15 18:51:24 +0800 | [diff] [blame] | 1694 | static int kvm_sync_page_transient(struct kvm_vcpu *vcpu, |
| 1695 | struct kvm_mmu_page *sp) |
| 1696 | { |
Xiao Guangrong | d98ba05 | 2010-06-04 21:55:29 +0800 | [diff] [blame] | 1697 | LIST_HEAD(invalid_list); |
Xiao Guangrong | 1d9dc7e | 2010-05-15 18:51:24 +0800 | [diff] [blame] | 1698 | int ret; |
| 1699 | |
Xiao Guangrong | d98ba05 | 2010-06-04 21:55:29 +0800 | [diff] [blame] | 1700 | ret = __kvm_sync_page(vcpu, sp, &invalid_list, false); |
Xiao Guangrong | be71e06 | 2010-06-11 21:31:38 +0800 | [diff] [blame] | 1701 | if (ret) |
Xiao Guangrong | d98ba05 | 2010-06-04 21:55:29 +0800 | [diff] [blame] | 1702 | kvm_mmu_commit_zap_page(vcpu->kvm, &invalid_list); |
| 1703 | |
Xiao Guangrong | 1d9dc7e | 2010-05-15 18:51:24 +0800 | [diff] [blame] | 1704 | return ret; |
| 1705 | } |
| 1706 | |
Xiao Guangrong | e37fa78 | 2011-11-30 17:43:24 +0800 | [diff] [blame] | 1707 | #ifdef CONFIG_KVM_MMU_AUDIT |
| 1708 | #include "mmu_audit.c" |
| 1709 | #else |
| 1710 | static void kvm_mmu_audit(struct kvm_vcpu *vcpu, int point) { } |
| 1711 | static void mmu_audit_disable(void) { } |
| 1712 | #endif |
| 1713 | |
Xiao Guangrong | d98ba05 | 2010-06-04 21:55:29 +0800 | [diff] [blame] | 1714 | static int kvm_sync_page(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp, |
| 1715 | struct list_head *invalid_list) |
Xiao Guangrong | 1d9dc7e | 2010-05-15 18:51:24 +0800 | [diff] [blame] | 1716 | { |
Xiao Guangrong | d98ba05 | 2010-06-04 21:55:29 +0800 | [diff] [blame] | 1717 | return __kvm_sync_page(vcpu, sp, invalid_list, true); |
Xiao Guangrong | 1d9dc7e | 2010-05-15 18:51:24 +0800 | [diff] [blame] | 1718 | } |
| 1719 | |
Xiao Guangrong | 9f1a122 | 2010-05-24 15:41:33 +0800 | [diff] [blame] | 1720 | /* @gfn should be write-protected at the call site */ |
| 1721 | static void kvm_sync_pages(struct kvm_vcpu *vcpu, gfn_t gfn) |
| 1722 | { |
Xiao Guangrong | 9f1a122 | 2010-05-24 15:41:33 +0800 | [diff] [blame] | 1723 | struct kvm_mmu_page *s; |
Xiao Guangrong | f41d335 | 2010-06-04 21:56:11 +0800 | [diff] [blame] | 1724 | struct hlist_node *node; |
Xiao Guangrong | d98ba05 | 2010-06-04 21:55:29 +0800 | [diff] [blame] | 1725 | LIST_HEAD(invalid_list); |
Xiao Guangrong | 9f1a122 | 2010-05-24 15:41:33 +0800 | [diff] [blame] | 1726 | bool flush = false; |
| 1727 | |
Xiao Guangrong | f41d335 | 2010-06-04 21:56:11 +0800 | [diff] [blame] | 1728 | for_each_gfn_indirect_valid_sp(vcpu->kvm, s, gfn, node) { |
Xiao Guangrong | 7ae680e | 2010-06-04 21:53:07 +0800 | [diff] [blame] | 1729 | if (!s->unsync) |
Xiao Guangrong | 9f1a122 | 2010-05-24 15:41:33 +0800 | [diff] [blame] | 1730 | continue; |
| 1731 | |
| 1732 | WARN_ON(s->role.level != PT_PAGE_TABLE_LEVEL); |
Xiao Guangrong | a4a8e6f | 2010-11-19 17:04:03 +0800 | [diff] [blame] | 1733 | kvm_unlink_unsync_page(vcpu->kvm, s); |
Xiao Guangrong | 9f1a122 | 2010-05-24 15:41:33 +0800 | [diff] [blame] | 1734 | if ((s->role.cr4_pae != !!is_pae(vcpu)) || |
Xiao Guangrong | a4a8e6f | 2010-11-19 17:04:03 +0800 | [diff] [blame] | 1735 | (vcpu->arch.mmu.sync_page(vcpu, s))) { |
Xiao Guangrong | d98ba05 | 2010-06-04 21:55:29 +0800 | [diff] [blame] | 1736 | kvm_mmu_prepare_zap_page(vcpu->kvm, s, &invalid_list); |
Xiao Guangrong | 9f1a122 | 2010-05-24 15:41:33 +0800 | [diff] [blame] | 1737 | continue; |
| 1738 | } |
Xiao Guangrong | 9f1a122 | 2010-05-24 15:41:33 +0800 | [diff] [blame] | 1739 | flush = true; |
| 1740 | } |
| 1741 | |
Xiao Guangrong | d98ba05 | 2010-06-04 21:55:29 +0800 | [diff] [blame] | 1742 | kvm_mmu_commit_zap_page(vcpu->kvm, &invalid_list); |
Xiao Guangrong | 9f1a122 | 2010-05-24 15:41:33 +0800 | [diff] [blame] | 1743 | if (flush) |
| 1744 | kvm_mmu_flush_tlb(vcpu); |
| 1745 | } |
| 1746 | |
Marcelo Tosatti | 60c8aec | 2008-12-01 22:32:02 -0200 | [diff] [blame] | 1747 | struct mmu_page_path { |
| 1748 | struct kvm_mmu_page *parent[PT64_ROOT_LEVEL-1]; |
| 1749 | unsigned int idx[PT64_ROOT_LEVEL-1]; |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 1750 | }; |
| 1751 | |
Marcelo Tosatti | 60c8aec | 2008-12-01 22:32:02 -0200 | [diff] [blame] | 1752 | #define for_each_sp(pvec, sp, parents, i) \ |
| 1753 | for (i = mmu_pages_next(&pvec, &parents, -1), \ |
| 1754 | sp = pvec.page[i].sp; \ |
| 1755 | i < pvec.nr && ({ sp = pvec.page[i].sp; 1;}); \ |
| 1756 | i = mmu_pages_next(&pvec, &parents, i)) |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 1757 | |
Hannes Eder | cded19f | 2009-02-21 02:19:13 +0100 | [diff] [blame] | 1758 | static int mmu_pages_next(struct kvm_mmu_pages *pvec, |
| 1759 | struct mmu_page_path *parents, |
| 1760 | int i) |
Marcelo Tosatti | 60c8aec | 2008-12-01 22:32:02 -0200 | [diff] [blame] | 1761 | { |
| 1762 | int n; |
| 1763 | |
| 1764 | for (n = i+1; n < pvec->nr; n++) { |
| 1765 | struct kvm_mmu_page *sp = pvec->page[n].sp; |
| 1766 | |
| 1767 | if (sp->role.level == PT_PAGE_TABLE_LEVEL) { |
| 1768 | parents->idx[0] = pvec->page[n].idx; |
| 1769 | return n; |
| 1770 | } |
| 1771 | |
| 1772 | parents->parent[sp->role.level-2] = sp; |
| 1773 | parents->idx[sp->role.level-1] = pvec->page[n].idx; |
| 1774 | } |
| 1775 | |
| 1776 | return n; |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 1777 | } |
| 1778 | |
Hannes Eder | cded19f | 2009-02-21 02:19:13 +0100 | [diff] [blame] | 1779 | static void mmu_pages_clear_parents(struct mmu_page_path *parents) |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 1780 | { |
Marcelo Tosatti | 60c8aec | 2008-12-01 22:32:02 -0200 | [diff] [blame] | 1781 | struct kvm_mmu_page *sp; |
| 1782 | unsigned int level = 0; |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 1783 | |
Marcelo Tosatti | 60c8aec | 2008-12-01 22:32:02 -0200 | [diff] [blame] | 1784 | do { |
| 1785 | unsigned int idx = parents->idx[level]; |
| 1786 | |
| 1787 | sp = parents->parent[level]; |
| 1788 | if (!sp) |
| 1789 | return; |
| 1790 | |
| 1791 | --sp->unsync_children; |
| 1792 | WARN_ON((int)sp->unsync_children < 0); |
| 1793 | __clear_bit(idx, sp->unsync_child_bitmap); |
| 1794 | level++; |
| 1795 | } while (level < PT64_ROOT_LEVEL-1 && !sp->unsync_children); |
| 1796 | } |
| 1797 | |
| 1798 | static void kvm_mmu_pages_init(struct kvm_mmu_page *parent, |
| 1799 | struct mmu_page_path *parents, |
| 1800 | struct kvm_mmu_pages *pvec) |
| 1801 | { |
| 1802 | parents->parent[parent->role.level-1] = NULL; |
| 1803 | pvec->nr = 0; |
| 1804 | } |
| 1805 | |
| 1806 | static void mmu_sync_children(struct kvm_vcpu *vcpu, |
| 1807 | struct kvm_mmu_page *parent) |
| 1808 | { |
| 1809 | int i; |
| 1810 | struct kvm_mmu_page *sp; |
| 1811 | struct mmu_page_path parents; |
| 1812 | struct kvm_mmu_pages pages; |
Xiao Guangrong | d98ba05 | 2010-06-04 21:55:29 +0800 | [diff] [blame] | 1813 | LIST_HEAD(invalid_list); |
Marcelo Tosatti | 60c8aec | 2008-12-01 22:32:02 -0200 | [diff] [blame] | 1814 | |
| 1815 | kvm_mmu_pages_init(parent, &parents, &pages); |
| 1816 | while (mmu_unsync_walk(parent, &pages)) { |
Xiao Guangrong | 2f84569 | 2012-06-20 15:56:53 +0800 | [diff] [blame] | 1817 | bool protected = false; |
Marcelo Tosatti | b1a3682 | 2008-12-01 22:32:03 -0200 | [diff] [blame] | 1818 | |
| 1819 | for_each_sp(pages, sp, parents, i) |
| 1820 | protected |= rmap_write_protect(vcpu->kvm, sp->gfn); |
| 1821 | |
| 1822 | if (protected) |
| 1823 | kvm_flush_remote_tlbs(vcpu->kvm); |
| 1824 | |
Marcelo Tosatti | 60c8aec | 2008-12-01 22:32:02 -0200 | [diff] [blame] | 1825 | for_each_sp(pages, sp, parents, i) { |
Xiao Guangrong | d98ba05 | 2010-06-04 21:55:29 +0800 | [diff] [blame] | 1826 | kvm_sync_page(vcpu, sp, &invalid_list); |
Marcelo Tosatti | 60c8aec | 2008-12-01 22:32:02 -0200 | [diff] [blame] | 1827 | mmu_pages_clear_parents(&parents); |
| 1828 | } |
Xiao Guangrong | d98ba05 | 2010-06-04 21:55:29 +0800 | [diff] [blame] | 1829 | kvm_mmu_commit_zap_page(vcpu->kvm, &invalid_list); |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 1830 | cond_resched_lock(&vcpu->kvm->mmu_lock); |
Marcelo Tosatti | 60c8aec | 2008-12-01 22:32:02 -0200 | [diff] [blame] | 1831 | kvm_mmu_pages_init(parent, &parents, &pages); |
| 1832 | } |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 1833 | } |
| 1834 | |
Xiao Guangrong | c370795 | 2011-07-12 03:28:04 +0800 | [diff] [blame] | 1835 | static void init_shadow_page_table(struct kvm_mmu_page *sp) |
| 1836 | { |
| 1837 | int i; |
| 1838 | |
| 1839 | for (i = 0; i < PT64_ENT_PER_PAGE; ++i) |
| 1840 | sp->spt[i] = 0ull; |
| 1841 | } |
| 1842 | |
Xiao Guangrong | a30f47c | 2011-09-22 16:58:36 +0800 | [diff] [blame] | 1843 | static void __clear_sp_write_flooding_count(struct kvm_mmu_page *sp) |
| 1844 | { |
| 1845 | sp->write_flooding_count = 0; |
| 1846 | } |
| 1847 | |
| 1848 | static void clear_sp_write_flooding_count(u64 *spte) |
| 1849 | { |
| 1850 | struct kvm_mmu_page *sp = page_header(__pa(spte)); |
| 1851 | |
| 1852 | __clear_sp_write_flooding_count(sp); |
| 1853 | } |
| 1854 | |
Avi Kivity | cea0f0e | 2007-01-05 16:36:43 -0800 | [diff] [blame] | 1855 | static struct kvm_mmu_page *kvm_mmu_get_page(struct kvm_vcpu *vcpu, |
| 1856 | gfn_t gfn, |
| 1857 | gva_t gaddr, |
| 1858 | unsigned level, |
Avi Kivity | f6e2c02 | 2009-01-11 13:02:10 +0200 | [diff] [blame] | 1859 | int direct, |
Avi Kivity | 41074d0 | 2007-12-09 17:00:02 +0200 | [diff] [blame] | 1860 | unsigned access, |
Avi Kivity | f7d9c7b | 2008-02-26 22:12:10 +0200 | [diff] [blame] | 1861 | u64 *parent_pte) |
Avi Kivity | cea0f0e | 2007-01-05 16:36:43 -0800 | [diff] [blame] | 1862 | { |
| 1863 | union kvm_mmu_page_role role; |
Avi Kivity | cea0f0e | 2007-01-05 16:36:43 -0800 | [diff] [blame] | 1864 | unsigned quadrant; |
Xiao Guangrong | 9f1a122 | 2010-05-24 15:41:33 +0800 | [diff] [blame] | 1865 | struct kvm_mmu_page *sp; |
Xiao Guangrong | f41d335 | 2010-06-04 21:56:11 +0800 | [diff] [blame] | 1866 | struct hlist_node *node; |
Xiao Guangrong | 9f1a122 | 2010-05-24 15:41:33 +0800 | [diff] [blame] | 1867 | bool need_sync = false; |
Avi Kivity | cea0f0e | 2007-01-05 16:36:43 -0800 | [diff] [blame] | 1868 | |
Avi Kivity | a770f6f | 2008-12-21 19:20:09 +0200 | [diff] [blame] | 1869 | role = vcpu->arch.mmu.base_role; |
Avi Kivity | cea0f0e | 2007-01-05 16:36:43 -0800 | [diff] [blame] | 1870 | role.level = level; |
Avi Kivity | f6e2c02 | 2009-01-11 13:02:10 +0200 | [diff] [blame] | 1871 | role.direct = direct; |
Avi Kivity | 84b0c8c | 2010-03-14 10:16:40 +0200 | [diff] [blame] | 1872 | if (role.direct) |
Avi Kivity | 5b7e010 | 2010-04-14 19:20:03 +0300 | [diff] [blame] | 1873 | role.cr4_pae = 0; |
Avi Kivity | 41074d0 | 2007-12-09 17:00:02 +0200 | [diff] [blame] | 1874 | role.access = access; |
Joerg Roedel | c5a78f2b | 2010-09-10 17:30:39 +0200 | [diff] [blame] | 1875 | if (!vcpu->arch.mmu.direct_map |
| 1876 | && vcpu->arch.mmu.root_level <= PT32_ROOT_LEVEL) { |
Avi Kivity | cea0f0e | 2007-01-05 16:36:43 -0800 | [diff] [blame] | 1877 | quadrant = gaddr >> (PAGE_SHIFT + (PT64_PT_BITS * level)); |
| 1878 | quadrant &= (1 << ((PT32_PT_BITS - PT64_PT_BITS) * level)) - 1; |
| 1879 | role.quadrant = quadrant; |
| 1880 | } |
Xiao Guangrong | f41d335 | 2010-06-04 21:56:11 +0800 | [diff] [blame] | 1881 | for_each_gfn_sp(vcpu->kvm, sp, gfn, node) { |
Xiao Guangrong | 7ae680e | 2010-06-04 21:53:07 +0800 | [diff] [blame] | 1882 | if (!need_sync && sp->unsync) |
| 1883 | need_sync = true; |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 1884 | |
Xiao Guangrong | 7ae680e | 2010-06-04 21:53:07 +0800 | [diff] [blame] | 1885 | if (sp->role.word != role.word) |
| 1886 | continue; |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 1887 | |
Xiao Guangrong | 7ae680e | 2010-06-04 21:53:07 +0800 | [diff] [blame] | 1888 | if (sp->unsync && kvm_sync_page_transient(vcpu, sp)) |
| 1889 | break; |
Xiao Guangrong | e02aa90 | 2010-05-15 18:52:34 +0800 | [diff] [blame] | 1890 | |
Xiao Guangrong | 7ae680e | 2010-06-04 21:53:07 +0800 | [diff] [blame] | 1891 | mmu_page_add_parent_pte(vcpu, sp, parent_pte); |
| 1892 | if (sp->unsync_children) { |
Avi Kivity | a8eeb04 | 2010-05-10 12:34:53 +0300 | [diff] [blame] | 1893 | kvm_make_request(KVM_REQ_MMU_SYNC, vcpu); |
Xiao Guangrong | 7ae680e | 2010-06-04 21:53:07 +0800 | [diff] [blame] | 1894 | kvm_mmu_mark_parents_unsync(sp); |
| 1895 | } else if (sp->unsync) |
| 1896 | kvm_mmu_mark_parents_unsync(sp); |
Xiao Guangrong | e02aa90 | 2010-05-15 18:52:34 +0800 | [diff] [blame] | 1897 | |
Xiao Guangrong | a30f47c | 2011-09-22 16:58:36 +0800 | [diff] [blame] | 1898 | __clear_sp_write_flooding_count(sp); |
Xiao Guangrong | 7ae680e | 2010-06-04 21:53:07 +0800 | [diff] [blame] | 1899 | trace_kvm_mmu_get_page(sp, false); |
| 1900 | return sp; |
| 1901 | } |
Avi Kivity | dfc5aa0 | 2007-12-18 19:47:18 +0200 | [diff] [blame] | 1902 | ++vcpu->kvm->stat.mmu_cache_miss; |
Lai Jiangshan | 2032a93 | 2010-05-26 16:49:59 +0800 | [diff] [blame] | 1903 | sp = kvm_mmu_alloc_page(vcpu, parent_pte, direct); |
Avi Kivity | 4db3531 | 2007-11-21 15:28:32 +0200 | [diff] [blame] | 1904 | if (!sp) |
| 1905 | return sp; |
Avi Kivity | 4db3531 | 2007-11-21 15:28:32 +0200 | [diff] [blame] | 1906 | sp->gfn = gfn; |
| 1907 | sp->role = role; |
Xiao Guangrong | 7ae680e | 2010-06-04 21:53:07 +0800 | [diff] [blame] | 1908 | hlist_add_head(&sp->hash_link, |
| 1909 | &vcpu->kvm->arch.mmu_page_hash[kvm_page_table_hashfn(gfn)]); |
Avi Kivity | f6e2c02 | 2009-01-11 13:02:10 +0200 | [diff] [blame] | 1910 | if (!direct) { |
Marcelo Tosatti | b1a3682 | 2008-12-01 22:32:03 -0200 | [diff] [blame] | 1911 | if (rmap_write_protect(vcpu->kvm, gfn)) |
| 1912 | kvm_flush_remote_tlbs(vcpu->kvm); |
Xiao Guangrong | 9f1a122 | 2010-05-24 15:41:33 +0800 | [diff] [blame] | 1913 | if (level > PT_PAGE_TABLE_LEVEL && need_sync) |
| 1914 | kvm_sync_pages(vcpu, gfn); |
| 1915 | |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 1916 | account_shadowed(vcpu->kvm, gfn); |
| 1917 | } |
Xiao Guangrong | c370795 | 2011-07-12 03:28:04 +0800 | [diff] [blame] | 1918 | init_shadow_page_table(sp); |
Avi Kivity | f691fe1 | 2009-07-06 15:58:14 +0300 | [diff] [blame] | 1919 | trace_kvm_mmu_get_page(sp, true); |
Avi Kivity | 4db3531 | 2007-11-21 15:28:32 +0200 | [diff] [blame] | 1920 | return sp; |
Avi Kivity | cea0f0e | 2007-01-05 16:36:43 -0800 | [diff] [blame] | 1921 | } |
| 1922 | |
Avi Kivity | 2d11123 | 2008-12-25 14:39:47 +0200 | [diff] [blame] | 1923 | static void shadow_walk_init(struct kvm_shadow_walk_iterator *iterator, |
| 1924 | struct kvm_vcpu *vcpu, u64 addr) |
| 1925 | { |
| 1926 | iterator->addr = addr; |
| 1927 | iterator->shadow_addr = vcpu->arch.mmu.root_hpa; |
| 1928 | iterator->level = vcpu->arch.mmu.shadow_root_level; |
Joerg Roedel | 81407ca | 2010-09-10 17:31:00 +0200 | [diff] [blame] | 1929 | |
| 1930 | if (iterator->level == PT64_ROOT_LEVEL && |
| 1931 | vcpu->arch.mmu.root_level < PT64_ROOT_LEVEL && |
| 1932 | !vcpu->arch.mmu.direct_map) |
| 1933 | --iterator->level; |
| 1934 | |
Avi Kivity | 2d11123 | 2008-12-25 14:39:47 +0200 | [diff] [blame] | 1935 | if (iterator->level == PT32E_ROOT_LEVEL) { |
| 1936 | iterator->shadow_addr |
| 1937 | = vcpu->arch.mmu.pae_root[(addr >> 30) & 3]; |
| 1938 | iterator->shadow_addr &= PT64_BASE_ADDR_MASK; |
| 1939 | --iterator->level; |
| 1940 | if (!iterator->shadow_addr) |
| 1941 | iterator->level = 0; |
| 1942 | } |
| 1943 | } |
| 1944 | |
| 1945 | static bool shadow_walk_okay(struct kvm_shadow_walk_iterator *iterator) |
| 1946 | { |
| 1947 | if (iterator->level < PT_PAGE_TABLE_LEVEL) |
| 1948 | return false; |
Marcelo Tosatti | 4d88954 | 2009-06-11 12:07:41 -0300 | [diff] [blame] | 1949 | |
Avi Kivity | 2d11123 | 2008-12-25 14:39:47 +0200 | [diff] [blame] | 1950 | iterator->index = SHADOW_PT_INDEX(iterator->addr, iterator->level); |
| 1951 | iterator->sptep = ((u64 *)__va(iterator->shadow_addr)) + iterator->index; |
| 1952 | return true; |
| 1953 | } |
| 1954 | |
Xiao Guangrong | c2a2ac2 | 2011-07-12 03:32:13 +0800 | [diff] [blame] | 1955 | static void __shadow_walk_next(struct kvm_shadow_walk_iterator *iterator, |
| 1956 | u64 spte) |
Avi Kivity | 2d11123 | 2008-12-25 14:39:47 +0200 | [diff] [blame] | 1957 | { |
Xiao Guangrong | c2a2ac2 | 2011-07-12 03:32:13 +0800 | [diff] [blame] | 1958 | if (is_last_spte(spte, iterator->level)) { |
Xiao Guangrong | 052331b | 2011-07-12 03:21:17 +0800 | [diff] [blame] | 1959 | iterator->level = 0; |
| 1960 | return; |
| 1961 | } |
| 1962 | |
Xiao Guangrong | c2a2ac2 | 2011-07-12 03:32:13 +0800 | [diff] [blame] | 1963 | iterator->shadow_addr = spte & PT64_BASE_ADDR_MASK; |
Avi Kivity | 2d11123 | 2008-12-25 14:39:47 +0200 | [diff] [blame] | 1964 | --iterator->level; |
| 1965 | } |
| 1966 | |
Xiao Guangrong | c2a2ac2 | 2011-07-12 03:32:13 +0800 | [diff] [blame] | 1967 | static void shadow_walk_next(struct kvm_shadow_walk_iterator *iterator) |
| 1968 | { |
| 1969 | return __shadow_walk_next(iterator, *iterator->sptep); |
| 1970 | } |
| 1971 | |
Avi Kivity | 32ef26a | 2010-07-13 14:27:04 +0300 | [diff] [blame] | 1972 | static void link_shadow_page(u64 *sptep, struct kvm_mmu_page *sp) |
| 1973 | { |
| 1974 | u64 spte; |
| 1975 | |
| 1976 | spte = __pa(sp->spt) |
| 1977 | | PT_PRESENT_MASK | PT_ACCESSED_MASK |
| 1978 | | PT_WRITABLE_MASK | PT_USER_MASK; |
Xiao Guangrong | 1df9f2d | 2011-07-12 03:30:35 +0800 | [diff] [blame] | 1979 | mmu_spte_set(sptep, spte); |
Avi Kivity | 32ef26a | 2010-07-13 14:27:04 +0300 | [diff] [blame] | 1980 | } |
| 1981 | |
Avi Kivity | a357bd2 | 2010-07-13 14:27:07 +0300 | [diff] [blame] | 1982 | static void validate_direct_spte(struct kvm_vcpu *vcpu, u64 *sptep, |
| 1983 | unsigned direct_access) |
| 1984 | { |
| 1985 | if (is_shadow_present_pte(*sptep) && !is_large_pte(*sptep)) { |
| 1986 | struct kvm_mmu_page *child; |
| 1987 | |
| 1988 | /* |
| 1989 | * For the direct sp, if the guest pte's dirty bit |
| 1990 | * changed form clean to dirty, it will corrupt the |
| 1991 | * sp's access: allow writable in the read-only sp, |
| 1992 | * so we should update the spte at this point to get |
| 1993 | * a new sp with the correct access. |
| 1994 | */ |
| 1995 | child = page_header(*sptep & PT64_BASE_ADDR_MASK); |
| 1996 | if (child->role.access == direct_access) |
| 1997 | return; |
| 1998 | |
Xiao Guangrong | bcdd9a9 | 2011-05-15 23:28:29 +0800 | [diff] [blame] | 1999 | drop_parent_pte(child, sptep); |
Avi Kivity | a357bd2 | 2010-07-13 14:27:07 +0300 | [diff] [blame] | 2000 | kvm_flush_remote_tlbs(vcpu->kvm); |
| 2001 | } |
| 2002 | } |
| 2003 | |
Xiao Guangrong | 505aef8 | 2011-09-22 16:56:06 +0800 | [diff] [blame] | 2004 | 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] | 2005 | u64 *spte) |
| 2006 | { |
| 2007 | u64 pte; |
| 2008 | struct kvm_mmu_page *child; |
| 2009 | |
| 2010 | pte = *spte; |
| 2011 | if (is_shadow_present_pte(pte)) { |
Xiao Guangrong | 505aef8 | 2011-09-22 16:56:06 +0800 | [diff] [blame] | 2012 | if (is_last_spte(pte, sp->role.level)) { |
Xiao Guangrong | c370795 | 2011-07-12 03:28:04 +0800 | [diff] [blame] | 2013 | drop_spte(kvm, spte); |
Xiao Guangrong | 505aef8 | 2011-09-22 16:56:06 +0800 | [diff] [blame] | 2014 | if (is_large_pte(pte)) |
| 2015 | --kvm->stat.lpages; |
| 2016 | } else { |
Xiao Guangrong | 38e3b2b | 2011-05-15 23:27:52 +0800 | [diff] [blame] | 2017 | child = page_header(pte & PT64_BASE_ADDR_MASK); |
Xiao Guangrong | bcdd9a9 | 2011-05-15 23:28:29 +0800 | [diff] [blame] | 2018 | drop_parent_pte(child, spte); |
Xiao Guangrong | 38e3b2b | 2011-05-15 23:27:52 +0800 | [diff] [blame] | 2019 | } |
Xiao Guangrong | 505aef8 | 2011-09-22 16:56:06 +0800 | [diff] [blame] | 2020 | return true; |
| 2021 | } |
| 2022 | |
| 2023 | if (is_mmio_spte(pte)) |
Xiao Guangrong | ce88dec | 2011-07-12 03:33:44 +0800 | [diff] [blame] | 2024 | mmu_spte_clear_no_track(spte); |
Xiao Guangrong | c370795 | 2011-07-12 03:28:04 +0800 | [diff] [blame] | 2025 | |
Xiao Guangrong | 505aef8 | 2011-09-22 16:56:06 +0800 | [diff] [blame] | 2026 | return false; |
Xiao Guangrong | 38e3b2b | 2011-05-15 23:27:52 +0800 | [diff] [blame] | 2027 | } |
| 2028 | |
Avi Kivity | 90cb052 | 2007-07-17 13:04:56 +0300 | [diff] [blame] | 2029 | static void kvm_mmu_page_unlink_children(struct kvm *kvm, |
Avi Kivity | 4db3531 | 2007-11-21 15:28:32 +0200 | [diff] [blame] | 2030 | struct kvm_mmu_page *sp) |
Avi Kivity | a436036 | 2007-01-05 16:36:45 -0800 | [diff] [blame] | 2031 | { |
Avi Kivity | 697fe2e | 2007-01-05 16:36:46 -0800 | [diff] [blame] | 2032 | unsigned i; |
Avi Kivity | 697fe2e | 2007-01-05 16:36:46 -0800 | [diff] [blame] | 2033 | |
Xiao Guangrong | 38e3b2b | 2011-05-15 23:27:52 +0800 | [diff] [blame] | 2034 | for (i = 0; i < PT64_ENT_PER_PAGE; ++i) |
| 2035 | mmu_page_zap_pte(kvm, sp, sp->spt + i); |
Avi Kivity | a436036 | 2007-01-05 16:36:45 -0800 | [diff] [blame] | 2036 | } |
| 2037 | |
Avi Kivity | 4db3531 | 2007-11-21 15:28:32 +0200 | [diff] [blame] | 2038 | 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] | 2039 | { |
Avi Kivity | 4db3531 | 2007-11-21 15:28:32 +0200 | [diff] [blame] | 2040 | mmu_page_remove_parent_pte(sp, parent_pte); |
Avi Kivity | a436036 | 2007-01-05 16:36:45 -0800 | [diff] [blame] | 2041 | } |
| 2042 | |
Avi Kivity | 31aa2b4 | 2008-07-11 17:59:46 +0300 | [diff] [blame] | 2043 | 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] | 2044 | { |
Takuya Yoshikawa | 1e3f42f | 2012-03-21 23:50:34 +0900 | [diff] [blame] | 2045 | u64 *sptep; |
| 2046 | struct rmap_iterator iter; |
Avi Kivity | a436036 | 2007-01-05 16:36:45 -0800 | [diff] [blame] | 2047 | |
Takuya Yoshikawa | 1e3f42f | 2012-03-21 23:50:34 +0900 | [diff] [blame] | 2048 | while ((sptep = rmap_get_first(sp->parent_ptes, &iter))) |
| 2049 | drop_parent_pte(sp, sptep); |
Avi Kivity | 31aa2b4 | 2008-07-11 17:59:46 +0300 | [diff] [blame] | 2050 | } |
| 2051 | |
Marcelo Tosatti | 60c8aec | 2008-12-01 22:32:02 -0200 | [diff] [blame] | 2052 | static int mmu_zap_unsync_children(struct kvm *kvm, |
Xiao Guangrong | 7775834 | 2010-06-04 21:53:54 +0800 | [diff] [blame] | 2053 | struct kvm_mmu_page *parent, |
| 2054 | struct list_head *invalid_list) |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 2055 | { |
Marcelo Tosatti | 60c8aec | 2008-12-01 22:32:02 -0200 | [diff] [blame] | 2056 | int i, zapped = 0; |
| 2057 | struct mmu_page_path parents; |
| 2058 | struct kvm_mmu_pages pages; |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 2059 | |
Marcelo Tosatti | 60c8aec | 2008-12-01 22:32:02 -0200 | [diff] [blame] | 2060 | if (parent->role.level == PT_PAGE_TABLE_LEVEL) |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 2061 | return 0; |
Marcelo Tosatti | 60c8aec | 2008-12-01 22:32:02 -0200 | [diff] [blame] | 2062 | |
| 2063 | kvm_mmu_pages_init(parent, &parents, &pages); |
| 2064 | while (mmu_unsync_walk(parent, &pages)) { |
| 2065 | struct kvm_mmu_page *sp; |
| 2066 | |
| 2067 | for_each_sp(pages, sp, parents, i) { |
Xiao Guangrong | 7775834 | 2010-06-04 21:53:54 +0800 | [diff] [blame] | 2068 | kvm_mmu_prepare_zap_page(kvm, sp, invalid_list); |
Marcelo Tosatti | 60c8aec | 2008-12-01 22:32:02 -0200 | [diff] [blame] | 2069 | mmu_pages_clear_parents(&parents); |
Xiao Guangrong | 77662e0 | 2010-04-16 16:34:42 +0800 | [diff] [blame] | 2070 | zapped++; |
Marcelo Tosatti | 60c8aec | 2008-12-01 22:32:02 -0200 | [diff] [blame] | 2071 | } |
Marcelo Tosatti | 60c8aec | 2008-12-01 22:32:02 -0200 | [diff] [blame] | 2072 | kvm_mmu_pages_init(parent, &parents, &pages); |
| 2073 | } |
| 2074 | |
| 2075 | return zapped; |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 2076 | } |
| 2077 | |
Xiao Guangrong | 7775834 | 2010-06-04 21:53:54 +0800 | [diff] [blame] | 2078 | static int kvm_mmu_prepare_zap_page(struct kvm *kvm, struct kvm_mmu_page *sp, |
| 2079 | struct list_head *invalid_list) |
Avi Kivity | 31aa2b4 | 2008-07-11 17:59:46 +0300 | [diff] [blame] | 2080 | { |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 2081 | int ret; |
Avi Kivity | f691fe1 | 2009-07-06 15:58:14 +0300 | [diff] [blame] | 2082 | |
Xiao Guangrong | 7775834 | 2010-06-04 21:53:54 +0800 | [diff] [blame] | 2083 | trace_kvm_mmu_prepare_zap_page(sp); |
Avi Kivity | 31aa2b4 | 2008-07-11 17:59:46 +0300 | [diff] [blame] | 2084 | ++kvm->stat.mmu_shadow_zapped; |
Xiao Guangrong | 7775834 | 2010-06-04 21:53:54 +0800 | [diff] [blame] | 2085 | ret = mmu_zap_unsync_children(kvm, sp, invalid_list); |
Avi Kivity | 4db3531 | 2007-11-21 15:28:32 +0200 | [diff] [blame] | 2086 | kvm_mmu_page_unlink_children(kvm, sp); |
Avi Kivity | 31aa2b4 | 2008-07-11 17:59:46 +0300 | [diff] [blame] | 2087 | kvm_mmu_unlink_parents(kvm, sp); |
Avi Kivity | f6e2c02 | 2009-01-11 13:02:10 +0200 | [diff] [blame] | 2088 | if (!sp->role.invalid && !sp->role.direct) |
Avi Kivity | 5b5c6a5 | 2008-07-11 18:07:26 +0300 | [diff] [blame] | 2089 | unaccount_shadowed(kvm, sp->gfn); |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 2090 | if (sp->unsync) |
| 2091 | kvm_unlink_unsync_page(kvm, sp); |
Avi Kivity | 4db3531 | 2007-11-21 15:28:32 +0200 | [diff] [blame] | 2092 | if (!sp->root_count) { |
Gui Jianfeng | 54a4f02 | 2010-05-05 09:03:49 +0800 | [diff] [blame] | 2093 | /* Count self */ |
| 2094 | ret++; |
Xiao Guangrong | 7775834 | 2010-06-04 21:53:54 +0800 | [diff] [blame] | 2095 | list_move(&sp->link, invalid_list); |
Xiao Guangrong | aa6bd18 | 2011-07-12 03:26:40 +0800 | [diff] [blame] | 2096 | kvm_mod_used_mmu_pages(kvm, -1); |
Marcelo Tosatti | 2e53d63 | 2008-02-20 14:47:24 -0500 | [diff] [blame] | 2097 | } else { |
Avi Kivity | 5b5c6a5 | 2008-07-11 18:07:26 +0300 | [diff] [blame] | 2098 | list_move(&sp->link, &kvm->arch.active_mmu_pages); |
Marcelo Tosatti | 2e53d63 | 2008-02-20 14:47:24 -0500 | [diff] [blame] | 2099 | kvm_reload_remote_mmus(kvm); |
| 2100 | } |
Xiao Guangrong | 7775834 | 2010-06-04 21:53:54 +0800 | [diff] [blame] | 2101 | |
| 2102 | sp->role.invalid = 1; |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 2103 | return ret; |
Avi Kivity | a436036 | 2007-01-05 16:36:45 -0800 | [diff] [blame] | 2104 | } |
| 2105 | |
Xiao Guangrong | 7775834 | 2010-06-04 21:53:54 +0800 | [diff] [blame] | 2106 | static void kvm_mmu_commit_zap_page(struct kvm *kvm, |
| 2107 | struct list_head *invalid_list) |
| 2108 | { |
| 2109 | struct kvm_mmu_page *sp; |
| 2110 | |
| 2111 | if (list_empty(invalid_list)) |
| 2112 | return; |
| 2113 | |
Avi Kivity | c142786 | 2012-05-14 15:44:06 +0300 | [diff] [blame] | 2114 | /* |
| 2115 | * wmb: make sure everyone sees our modifications to the page tables |
| 2116 | * rmb: make sure we see changes to vcpu->mode |
| 2117 | */ |
| 2118 | smp_mb(); |
| 2119 | |
| 2120 | /* |
| 2121 | * Wait for all vcpus to exit guest mode and/or lockless shadow |
| 2122 | * page table walks. |
| 2123 | */ |
Xiao Guangrong | 7775834 | 2010-06-04 21:53:54 +0800 | [diff] [blame] | 2124 | kvm_flush_remote_tlbs(kvm); |
| 2125 | |
| 2126 | do { |
| 2127 | sp = list_first_entry(invalid_list, struct kvm_mmu_page, link); |
| 2128 | WARN_ON(!sp->role.invalid || sp->root_count); |
Xiao Guangrong | bd4c86e | 2011-07-12 03:27:14 +0800 | [diff] [blame] | 2129 | kvm_mmu_isolate_page(sp); |
Xiao Guangrong | aa6bd18 | 2011-07-12 03:26:40 +0800 | [diff] [blame] | 2130 | kvm_mmu_free_page(sp); |
Xiao Guangrong | 7775834 | 2010-06-04 21:53:54 +0800 | [diff] [blame] | 2131 | } while (!list_empty(invalid_list)); |
Xiao Guangrong | 7775834 | 2010-06-04 21:53:54 +0800 | [diff] [blame] | 2132 | } |
| 2133 | |
Izik Eidus | 82ce2c9 | 2007-10-02 18:52:55 +0200 | [diff] [blame] | 2134 | /* |
| 2135 | * Changing the number of mmu pages allocated to the vm |
Dave Hansen | 49d5ca2 | 2010-08-19 18:11:28 -0700 | [diff] [blame] | 2136 | * 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] | 2137 | */ |
Dave Hansen | 49d5ca2 | 2010-08-19 18:11:28 -0700 | [diff] [blame] | 2138 | 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] | 2139 | { |
Xiao Guangrong | d98ba05 | 2010-06-04 21:55:29 +0800 | [diff] [blame] | 2140 | LIST_HEAD(invalid_list); |
Izik Eidus | 82ce2c9 | 2007-10-02 18:52:55 +0200 | [diff] [blame] | 2141 | /* |
| 2142 | * If we set the number of mmu pages to be smaller be than the |
| 2143 | * number of actived pages , we must to free some mmu pages before we |
| 2144 | * change the value |
| 2145 | */ |
| 2146 | |
Dave Hansen | 49d5ca2 | 2010-08-19 18:11:28 -0700 | [diff] [blame] | 2147 | if (kvm->arch.n_used_mmu_pages > goal_nr_mmu_pages) { |
| 2148 | while (kvm->arch.n_used_mmu_pages > goal_nr_mmu_pages && |
Xiao Guangrong | 77662e0 | 2010-04-16 16:34:42 +0800 | [diff] [blame] | 2149 | !list_empty(&kvm->arch.active_mmu_pages)) { |
Izik Eidus | 82ce2c9 | 2007-10-02 18:52:55 +0200 | [diff] [blame] | 2150 | struct kvm_mmu_page *page; |
| 2151 | |
Zhang Xiantao | f05e70a | 2007-12-14 10:01:48 +0800 | [diff] [blame] | 2152 | page = container_of(kvm->arch.active_mmu_pages.prev, |
Izik Eidus | 82ce2c9 | 2007-10-02 18:52:55 +0200 | [diff] [blame] | 2153 | struct kvm_mmu_page, link); |
Xiaotian Feng | 80b63fa | 2010-08-24 10:31:07 +0800 | [diff] [blame] | 2154 | kvm_mmu_prepare_zap_page(kvm, page, &invalid_list); |
Izik Eidus | 82ce2c9 | 2007-10-02 18:52:55 +0200 | [diff] [blame] | 2155 | } |
Xiao Guangrong | aa6bd18 | 2011-07-12 03:26:40 +0800 | [diff] [blame] | 2156 | kvm_mmu_commit_zap_page(kvm, &invalid_list); |
Dave Hansen | 49d5ca2 | 2010-08-19 18:11:28 -0700 | [diff] [blame] | 2157 | goal_nr_mmu_pages = kvm->arch.n_used_mmu_pages; |
Izik Eidus | 82ce2c9 | 2007-10-02 18:52:55 +0200 | [diff] [blame] | 2158 | } |
Izik Eidus | 82ce2c9 | 2007-10-02 18:52:55 +0200 | [diff] [blame] | 2159 | |
Dave Hansen | 49d5ca2 | 2010-08-19 18:11:28 -0700 | [diff] [blame] | 2160 | kvm->arch.n_max_mmu_pages = goal_nr_mmu_pages; |
Izik Eidus | 82ce2c9 | 2007-10-02 18:52:55 +0200 | [diff] [blame] | 2161 | } |
| 2162 | |
Xiao Guangrong | 1cb3f3a | 2011-09-22 17:02:48 +0800 | [diff] [blame] | 2163 | int kvm_mmu_unprotect_page(struct kvm *kvm, gfn_t gfn) |
Avi Kivity | a436036 | 2007-01-05 16:36:45 -0800 | [diff] [blame] | 2164 | { |
Avi Kivity | 4db3531 | 2007-11-21 15:28:32 +0200 | [diff] [blame] | 2165 | struct kvm_mmu_page *sp; |
Xiao Guangrong | f41d335 | 2010-06-04 21:56:11 +0800 | [diff] [blame] | 2166 | struct hlist_node *node; |
Xiao Guangrong | d98ba05 | 2010-06-04 21:55:29 +0800 | [diff] [blame] | 2167 | LIST_HEAD(invalid_list); |
Avi Kivity | a436036 | 2007-01-05 16:36:45 -0800 | [diff] [blame] | 2168 | int r; |
| 2169 | |
Xiao Guangrong | 9ad17b10 | 2010-08-28 19:19:42 +0800 | [diff] [blame] | 2170 | pgprintk("%s: looking for gfn %llx\n", __func__, gfn); |
Avi Kivity | a436036 | 2007-01-05 16:36:45 -0800 | [diff] [blame] | 2171 | r = 0; |
Xiao Guangrong | 1cb3f3a | 2011-09-22 17:02:48 +0800 | [diff] [blame] | 2172 | spin_lock(&kvm->mmu_lock); |
Xiao Guangrong | f41d335 | 2010-06-04 21:56:11 +0800 | [diff] [blame] | 2173 | for_each_gfn_indirect_valid_sp(kvm, sp, gfn, node) { |
Xiao Guangrong | 9ad17b10 | 2010-08-28 19:19:42 +0800 | [diff] [blame] | 2174 | pgprintk("%s: gfn %llx role %x\n", __func__, gfn, |
Xiao Guangrong | 7ae680e | 2010-06-04 21:53:07 +0800 | [diff] [blame] | 2175 | sp->role.word); |
| 2176 | r = 1; |
Xiao Guangrong | f41d335 | 2010-06-04 21:56:11 +0800 | [diff] [blame] | 2177 | kvm_mmu_prepare_zap_page(kvm, sp, &invalid_list); |
Xiao Guangrong | 7ae680e | 2010-06-04 21:53:07 +0800 | [diff] [blame] | 2178 | } |
Xiao Guangrong | d98ba05 | 2010-06-04 21:55:29 +0800 | [diff] [blame] | 2179 | kvm_mmu_commit_zap_page(kvm, &invalid_list); |
Xiao Guangrong | 1cb3f3a | 2011-09-22 17:02:48 +0800 | [diff] [blame] | 2180 | spin_unlock(&kvm->mmu_lock); |
| 2181 | |
Avi Kivity | a436036 | 2007-01-05 16:36:45 -0800 | [diff] [blame] | 2182 | return r; |
Avi Kivity | cea0f0e | 2007-01-05 16:36:43 -0800 | [diff] [blame] | 2183 | } |
Xiao Guangrong | 1cb3f3a | 2011-09-22 17:02:48 +0800 | [diff] [blame] | 2184 | EXPORT_SYMBOL_GPL(kvm_mmu_unprotect_page); |
Avi Kivity | cea0f0e | 2007-01-05 16:36:43 -0800 | [diff] [blame] | 2185 | |
Avi Kivity | 38c335f | 2007-11-21 14:20:22 +0200 | [diff] [blame] | 2186 | static void page_header_update_slot(struct kvm *kvm, void *pte, gfn_t gfn) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 2187 | { |
Marcelo Tosatti | bc6678a | 2009-12-23 14:35:21 -0200 | [diff] [blame] | 2188 | int slot = memslot_id(kvm, gfn); |
Avi Kivity | 4db3531 | 2007-11-21 15:28:32 +0200 | [diff] [blame] | 2189 | struct kvm_mmu_page *sp = page_header(__pa(pte)); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 2190 | |
Sheng Yang | 291f26b | 2008-10-16 17:30:57 +0800 | [diff] [blame] | 2191 | __set_bit(slot, sp->slot_bitmap); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 2192 | } |
| 2193 | |
Sheng Yang | 74be52e | 2008-10-09 16:01:56 +0800 | [diff] [blame] | 2194 | /* |
| 2195 | * The function is based on mtrr_type_lookup() in |
| 2196 | * arch/x86/kernel/cpu/mtrr/generic.c |
| 2197 | */ |
| 2198 | static int get_mtrr_type(struct mtrr_state_type *mtrr_state, |
| 2199 | u64 start, u64 end) |
| 2200 | { |
| 2201 | int i; |
| 2202 | u64 base, mask; |
| 2203 | u8 prev_match, curr_match; |
| 2204 | int num_var_ranges = KVM_NR_VAR_MTRR; |
| 2205 | |
| 2206 | if (!mtrr_state->enabled) |
| 2207 | return 0xFF; |
| 2208 | |
| 2209 | /* Make end inclusive end, instead of exclusive */ |
| 2210 | end--; |
| 2211 | |
| 2212 | /* Look in fixed ranges. Just return the type as per start */ |
| 2213 | if (mtrr_state->have_fixed && (start < 0x100000)) { |
| 2214 | int idx; |
| 2215 | |
| 2216 | if (start < 0x80000) { |
| 2217 | idx = 0; |
| 2218 | idx += (start >> 16); |
| 2219 | return mtrr_state->fixed_ranges[idx]; |
| 2220 | } else if (start < 0xC0000) { |
| 2221 | idx = 1 * 8; |
| 2222 | idx += ((start - 0x80000) >> 14); |
| 2223 | return mtrr_state->fixed_ranges[idx]; |
| 2224 | } else if (start < 0x1000000) { |
| 2225 | idx = 3 * 8; |
| 2226 | idx += ((start - 0xC0000) >> 12); |
| 2227 | return mtrr_state->fixed_ranges[idx]; |
| 2228 | } |
| 2229 | } |
| 2230 | |
| 2231 | /* |
| 2232 | * Look in variable ranges |
| 2233 | * Look of multiple ranges matching this address and pick type |
| 2234 | * as per MTRR precedence |
| 2235 | */ |
| 2236 | if (!(mtrr_state->enabled & 2)) |
| 2237 | return mtrr_state->def_type; |
| 2238 | |
| 2239 | prev_match = 0xFF; |
| 2240 | for (i = 0; i < num_var_ranges; ++i) { |
| 2241 | unsigned short start_state, end_state; |
| 2242 | |
| 2243 | if (!(mtrr_state->var_ranges[i].mask_lo & (1 << 11))) |
| 2244 | continue; |
| 2245 | |
| 2246 | base = (((u64)mtrr_state->var_ranges[i].base_hi) << 32) + |
| 2247 | (mtrr_state->var_ranges[i].base_lo & PAGE_MASK); |
| 2248 | mask = (((u64)mtrr_state->var_ranges[i].mask_hi) << 32) + |
| 2249 | (mtrr_state->var_ranges[i].mask_lo & PAGE_MASK); |
| 2250 | |
| 2251 | start_state = ((start & mask) == (base & mask)); |
| 2252 | end_state = ((end & mask) == (base & mask)); |
| 2253 | if (start_state != end_state) |
| 2254 | return 0xFE; |
| 2255 | |
| 2256 | if ((start & mask) != (base & mask)) |
| 2257 | continue; |
| 2258 | |
| 2259 | curr_match = mtrr_state->var_ranges[i].base_lo & 0xff; |
| 2260 | if (prev_match == 0xFF) { |
| 2261 | prev_match = curr_match; |
| 2262 | continue; |
| 2263 | } |
| 2264 | |
| 2265 | if (prev_match == MTRR_TYPE_UNCACHABLE || |
| 2266 | curr_match == MTRR_TYPE_UNCACHABLE) |
| 2267 | return MTRR_TYPE_UNCACHABLE; |
| 2268 | |
| 2269 | if ((prev_match == MTRR_TYPE_WRBACK && |
| 2270 | curr_match == MTRR_TYPE_WRTHROUGH) || |
| 2271 | (prev_match == MTRR_TYPE_WRTHROUGH && |
| 2272 | curr_match == MTRR_TYPE_WRBACK)) { |
| 2273 | prev_match = MTRR_TYPE_WRTHROUGH; |
| 2274 | curr_match = MTRR_TYPE_WRTHROUGH; |
| 2275 | } |
| 2276 | |
| 2277 | if (prev_match != curr_match) |
| 2278 | return MTRR_TYPE_UNCACHABLE; |
| 2279 | } |
| 2280 | |
| 2281 | if (prev_match != 0xFF) |
| 2282 | return prev_match; |
| 2283 | |
| 2284 | return mtrr_state->def_type; |
| 2285 | } |
| 2286 | |
Sheng Yang | 4b12f0d | 2009-04-27 20:35:42 +0800 | [diff] [blame] | 2287 | 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] | 2288 | { |
| 2289 | u8 mtrr; |
| 2290 | |
| 2291 | mtrr = get_mtrr_type(&vcpu->arch.mtrr_state, gfn << PAGE_SHIFT, |
| 2292 | (gfn << PAGE_SHIFT) + PAGE_SIZE); |
| 2293 | if (mtrr == 0xfe || mtrr == 0xff) |
| 2294 | mtrr = MTRR_TYPE_WRBACK; |
| 2295 | return mtrr; |
| 2296 | } |
Sheng Yang | 4b12f0d | 2009-04-27 20:35:42 +0800 | [diff] [blame] | 2297 | EXPORT_SYMBOL_GPL(kvm_get_guest_memory_type); |
Sheng Yang | 74be52e | 2008-10-09 16:01:56 +0800 | [diff] [blame] | 2298 | |
Xiao Guangrong | 9cf5cf5 | 2010-05-24 15:40:07 +0800 | [diff] [blame] | 2299 | 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] | 2300 | { |
Xiao Guangrong | 5e1b3dd | 2010-04-28 11:55:06 +0800 | [diff] [blame] | 2301 | trace_kvm_mmu_unsync_page(sp); |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 2302 | ++vcpu->kvm->stat.mmu_unsync; |
| 2303 | sp->unsync = 1; |
Marcelo Tosatti | 6cffe8c | 2008-12-01 22:32:04 -0200 | [diff] [blame] | 2304 | |
Xiao Guangrong | 6b18493 | 2010-04-16 21:29:17 +0800 | [diff] [blame] | 2305 | kvm_mmu_mark_parents_unsync(sp); |
Xiao Guangrong | 9cf5cf5 | 2010-05-24 15:40:07 +0800 | [diff] [blame] | 2306 | } |
| 2307 | |
| 2308 | static void kvm_unsync_pages(struct kvm_vcpu *vcpu, gfn_t gfn) |
| 2309 | { |
Xiao Guangrong | 9cf5cf5 | 2010-05-24 15:40:07 +0800 | [diff] [blame] | 2310 | struct kvm_mmu_page *s; |
Xiao Guangrong | f41d335 | 2010-06-04 21:56:11 +0800 | [diff] [blame] | 2311 | struct hlist_node *node; |
Xiao Guangrong | 9cf5cf5 | 2010-05-24 15:40:07 +0800 | [diff] [blame] | 2312 | |
Xiao Guangrong | f41d335 | 2010-06-04 21:56:11 +0800 | [diff] [blame] | 2313 | for_each_gfn_indirect_valid_sp(vcpu->kvm, s, gfn, node) { |
Xiao Guangrong | 7ae680e | 2010-06-04 21:53:07 +0800 | [diff] [blame] | 2314 | if (s->unsync) |
Xiao Guangrong | 9cf5cf5 | 2010-05-24 15:40:07 +0800 | [diff] [blame] | 2315 | continue; |
| 2316 | WARN_ON(s->role.level != PT_PAGE_TABLE_LEVEL); |
| 2317 | __kvm_unsync_page(vcpu, s); |
| 2318 | } |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 2319 | } |
| 2320 | |
| 2321 | static int mmu_need_write_protect(struct kvm_vcpu *vcpu, gfn_t gfn, |
| 2322 | bool can_unsync) |
| 2323 | { |
Xiao Guangrong | 9cf5cf5 | 2010-05-24 15:40:07 +0800 | [diff] [blame] | 2324 | struct kvm_mmu_page *s; |
Xiao Guangrong | f41d335 | 2010-06-04 21:56:11 +0800 | [diff] [blame] | 2325 | struct hlist_node *node; |
Xiao Guangrong | 9cf5cf5 | 2010-05-24 15:40:07 +0800 | [diff] [blame] | 2326 | bool need_unsync = false; |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 2327 | |
Xiao Guangrong | f41d335 | 2010-06-04 21:56:11 +0800 | [diff] [blame] | 2328 | for_each_gfn_indirect_valid_sp(vcpu->kvm, s, gfn, node) { |
Xiao Guangrong | 36a2e67 | 2010-06-30 16:02:02 +0800 | [diff] [blame] | 2329 | if (!can_unsync) |
| 2330 | return 1; |
| 2331 | |
Xiao Guangrong | 9cf5cf5 | 2010-05-24 15:40:07 +0800 | [diff] [blame] | 2332 | if (s->role.level != PT_PAGE_TABLE_LEVEL) |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 2333 | return 1; |
Xiao Guangrong | 9cf5cf5 | 2010-05-24 15:40:07 +0800 | [diff] [blame] | 2334 | |
| 2335 | if (!need_unsync && !s->unsync) { |
Xiao Guangrong | 9cf5cf5 | 2010-05-24 15:40:07 +0800 | [diff] [blame] | 2336 | need_unsync = true; |
| 2337 | } |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 2338 | } |
Xiao Guangrong | 9cf5cf5 | 2010-05-24 15:40:07 +0800 | [diff] [blame] | 2339 | if (need_unsync) |
| 2340 | kvm_unsync_pages(vcpu, gfn); |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 2341 | return 0; |
| 2342 | } |
| 2343 | |
Avi Kivity | d555c33 | 2009-06-10 14:24:23 +0300 | [diff] [blame] | 2344 | static int set_spte(struct kvm_vcpu *vcpu, u64 *sptep, |
Marcelo Tosatti | 1e73f9d | 2008-09-23 13:18:30 -0300 | [diff] [blame] | 2345 | unsigned pte_access, int user_fault, |
Xiao Guangrong | 640d9b0 | 2011-07-12 03:24:39 +0800 | [diff] [blame] | 2346 | int write_fault, int level, |
Marcelo Tosatti | c2d0ee4 | 2009-04-05 14:54:47 -0300 | [diff] [blame] | 2347 | gfn_t gfn, pfn_t pfn, bool speculative, |
Lai Jiangshan | 9bdbba1 | 2010-11-19 17:03:22 +0800 | [diff] [blame] | 2348 | bool can_unsync, bool host_writable) |
Avi Kivity | 1c4f1fd | 2007-12-09 17:40:31 +0200 | [diff] [blame] | 2349 | { |
Xiao Guangrong | 6e7d035 | 2012-06-20 15:58:33 +0800 | [diff] [blame] | 2350 | u64 spte; |
Marcelo Tosatti | 1e73f9d | 2008-09-23 13:18:30 -0300 | [diff] [blame] | 2351 | int ret = 0; |
Sheng Yang | 64d4d52 | 2008-10-09 16:01:57 +0800 | [diff] [blame] | 2352 | |
Xiao Guangrong | ce88dec | 2011-07-12 03:33:44 +0800 | [diff] [blame] | 2353 | if (set_mmio_spte(sptep, gfn, pfn, pte_access)) |
| 2354 | return 0; |
| 2355 | |
Marcelo Tosatti | 982c256 | 2010-10-22 14:18:16 -0200 | [diff] [blame] | 2356 | spte = PT_PRESENT_MASK; |
Avi Kivity | 947da53 | 2008-03-18 11:05:52 +0200 | [diff] [blame] | 2357 | if (!speculative) |
Avi Kivity | 3201b5d | 2008-08-27 20:01:04 +0300 | [diff] [blame] | 2358 | spte |= shadow_accessed_mask; |
Xiao Guangrong | 640d9b0 | 2011-07-12 03:24:39 +0800 | [diff] [blame] | 2359 | |
Sheng Yang | 7b52345 | 2008-04-25 21:13:50 +0800 | [diff] [blame] | 2360 | if (pte_access & ACC_EXEC_MASK) |
| 2361 | spte |= shadow_x_mask; |
| 2362 | else |
| 2363 | spte |= shadow_nx_mask; |
Xiao Guangrong | 49fde34 | 2012-06-20 15:58:58 +0800 | [diff] [blame] | 2364 | |
Avi Kivity | 1c4f1fd | 2007-12-09 17:40:31 +0200 | [diff] [blame] | 2365 | if (pte_access & ACC_USER_MASK) |
Sheng Yang | 7b52345 | 2008-04-25 21:13:50 +0800 | [diff] [blame] | 2366 | spte |= shadow_user_mask; |
Xiao Guangrong | 49fde34 | 2012-06-20 15:58:58 +0800 | [diff] [blame] | 2367 | |
Joerg Roedel | 852e3c1 | 2009-07-27 16:30:44 +0200 | [diff] [blame] | 2368 | if (level > PT_PAGE_TABLE_LEVEL) |
Marcelo Tosatti | 05da455 | 2008-02-23 11:44:30 -0300 | [diff] [blame] | 2369 | spte |= PT_PAGE_SIZE_MASK; |
Avi Kivity | b0bc3ee | 2010-09-13 16:45:28 +0200 | [diff] [blame] | 2370 | if (tdp_enabled) |
Sheng Yang | 4b12f0d | 2009-04-27 20:35:42 +0800 | [diff] [blame] | 2371 | spte |= kvm_x86_ops->get_mt_mask(vcpu, gfn, |
| 2372 | kvm_is_mmio_pfn(pfn)); |
Avi Kivity | 1c4f1fd | 2007-12-09 17:40:31 +0200 | [diff] [blame] | 2373 | |
Lai Jiangshan | 9bdbba1 | 2010-11-19 17:03:22 +0800 | [diff] [blame] | 2374 | if (host_writable) |
Izik Eidus | 1403283 | 2009-09-23 21:47:17 +0300 | [diff] [blame] | 2375 | spte |= SPTE_HOST_WRITEABLE; |
Xiao Guangrong | f8e453b | 2010-12-23 16:09:29 +0800 | [diff] [blame] | 2376 | else |
| 2377 | pte_access &= ~ACC_WRITE_MASK; |
Izik Eidus | 1403283 | 2009-09-23 21:47:17 +0300 | [diff] [blame] | 2378 | |
Anthony Liguori | 35149e2 | 2008-04-02 14:46:56 -0500 | [diff] [blame] | 2379 | spte |= (u64)pfn << PAGE_SHIFT; |
Avi Kivity | 1c4f1fd | 2007-12-09 17:40:31 +0200 | [diff] [blame] | 2380 | |
| 2381 | if ((pte_access & ACC_WRITE_MASK) |
Joerg Roedel | c5a78f2b | 2010-09-10 17:30:39 +0200 | [diff] [blame] | 2382 | || (!vcpu->arch.mmu.direct_map && write_fault |
| 2383 | && !is_write_protection(vcpu) && !user_fault)) { |
Avi Kivity | 1c4f1fd | 2007-12-09 17:40:31 +0200 | [diff] [blame] | 2384 | |
Joerg Roedel | 852e3c1 | 2009-07-27 16:30:44 +0200 | [diff] [blame] | 2385 | if (level > PT_PAGE_TABLE_LEVEL && |
| 2386 | has_wrprotected_page(vcpu->kvm, gfn, level)) { |
Marcelo Tosatti | 38187c8 | 2008-09-23 13:18:32 -0300 | [diff] [blame] | 2387 | ret = 1; |
Xiao Guangrong | c370795 | 2011-07-12 03:28:04 +0800 | [diff] [blame] | 2388 | drop_spte(vcpu->kvm, sptep); |
Avi Kivity | be38d27 | 2010-06-06 14:31:27 +0300 | [diff] [blame] | 2389 | goto done; |
Marcelo Tosatti | 38187c8 | 2008-09-23 13:18:32 -0300 | [diff] [blame] | 2390 | } |
| 2391 | |
Xiao Guangrong | 49fde34 | 2012-06-20 15:58:58 +0800 | [diff] [blame] | 2392 | spte |= PT_WRITABLE_MASK | SPTE_MMU_WRITEABLE; |
Avi Kivity | 1c4f1fd | 2007-12-09 17:40:31 +0200 | [diff] [blame] | 2393 | |
Joerg Roedel | c5a78f2b | 2010-09-10 17:30:39 +0200 | [diff] [blame] | 2394 | if (!vcpu->arch.mmu.direct_map |
Avi Kivity | 411c588 | 2011-06-06 16:11:54 +0300 | [diff] [blame] | 2395 | && !(pte_access & ACC_WRITE_MASK)) { |
Avi Kivity | 69325a1 | 2010-05-27 14:35:58 +0300 | [diff] [blame] | 2396 | spte &= ~PT_USER_MASK; |
Avi Kivity | 411c588 | 2011-06-06 16:11:54 +0300 | [diff] [blame] | 2397 | /* |
| 2398 | * If we converted a user page to a kernel page, |
| 2399 | * so that the kernel can write to it when cr0.wp=0, |
| 2400 | * then we should prevent the kernel from executing it |
| 2401 | * if SMEP is enabled. |
| 2402 | */ |
| 2403 | if (kvm_read_cr4_bits(vcpu, X86_CR4_SMEP)) |
| 2404 | spte |= PT64_NX_MASK; |
| 2405 | } |
Avi Kivity | 69325a1 | 2010-05-27 14:35:58 +0300 | [diff] [blame] | 2406 | |
Marcelo Tosatti | ecc5589 | 2008-11-25 15:58:07 +0100 | [diff] [blame] | 2407 | /* |
| 2408 | * Optimization: for pte sync, if spte was writable the hash |
| 2409 | * lookup is unnecessary (and expensive). Write protection |
| 2410 | * is responsibility of mmu_get_page / kvm_sync_page. |
| 2411 | * Same reasoning can be applied to dirty page accounting. |
| 2412 | */ |
Takuya Yoshikawa | 8dae444 | 2010-01-18 18:45:10 +0900 | [diff] [blame] | 2413 | if (!can_unsync && is_writable_pte(*sptep)) |
Marcelo Tosatti | ecc5589 | 2008-11-25 15:58:07 +0100 | [diff] [blame] | 2414 | goto set_pte; |
| 2415 | |
Marcelo Tosatti | 4731d4c | 2008-09-23 13:18:39 -0300 | [diff] [blame] | 2416 | if (mmu_need_write_protect(vcpu, gfn, can_unsync)) { |
Xiao Guangrong | 9ad17b10 | 2010-08-28 19:19:42 +0800 | [diff] [blame] | 2417 | pgprintk("%s: found shadow page for %llx, marking ro\n", |
Harvey Harrison | b8688d5 | 2008-03-03 12:59:56 -0800 | [diff] [blame] | 2418 | __func__, gfn); |
Marcelo Tosatti | 1e73f9d | 2008-09-23 13:18:30 -0300 | [diff] [blame] | 2419 | ret = 1; |
Avi Kivity | 1c4f1fd | 2007-12-09 17:40:31 +0200 | [diff] [blame] | 2420 | pte_access &= ~ACC_WRITE_MASK; |
Xiao Guangrong | 49fde34 | 2012-06-20 15:58:58 +0800 | [diff] [blame] | 2421 | spte &= ~(PT_WRITABLE_MASK | SPTE_MMU_WRITEABLE); |
Avi Kivity | 1c4f1fd | 2007-12-09 17:40:31 +0200 | [diff] [blame] | 2422 | } |
| 2423 | } |
| 2424 | |
Avi Kivity | 1c4f1fd | 2007-12-09 17:40:31 +0200 | [diff] [blame] | 2425 | if (pte_access & ACC_WRITE_MASK) |
| 2426 | mark_page_dirty(vcpu->kvm, gfn); |
| 2427 | |
Marcelo Tosatti | 38187c8 | 2008-09-23 13:18:32 -0300 | [diff] [blame] | 2428 | set_pte: |
Xiao Guangrong | 6e7d035 | 2012-06-20 15:58:33 +0800 | [diff] [blame] | 2429 | if (mmu_spte_update(sptep, spte)) |
Xiao Guangrong | b330aa0 | 2010-11-19 17:02:35 +0800 | [diff] [blame] | 2430 | kvm_flush_remote_tlbs(vcpu->kvm); |
Avi Kivity | be38d27 | 2010-06-06 14:31:27 +0300 | [diff] [blame] | 2431 | done: |
Marcelo Tosatti | 1e73f9d | 2008-09-23 13:18:30 -0300 | [diff] [blame] | 2432 | return ret; |
| 2433 | } |
| 2434 | |
Avi Kivity | d555c33 | 2009-06-10 14:24:23 +0300 | [diff] [blame] | 2435 | static void mmu_set_spte(struct kvm_vcpu *vcpu, u64 *sptep, |
Marcelo Tosatti | 1e73f9d | 2008-09-23 13:18:30 -0300 | [diff] [blame] | 2436 | unsigned pt_access, unsigned pte_access, |
Xiao Guangrong | 640d9b0 | 2011-07-12 03:24:39 +0800 | [diff] [blame] | 2437 | int user_fault, int write_fault, |
Xiao Guangrong | b90a0e6 | 2011-07-12 03:25:56 +0800 | [diff] [blame] | 2438 | int *emulate, int level, gfn_t gfn, |
Izik Eidus | 1403283 | 2009-09-23 21:47:17 +0300 | [diff] [blame] | 2439 | pfn_t pfn, bool speculative, |
Lai Jiangshan | 9bdbba1 | 2010-11-19 17:03:22 +0800 | [diff] [blame] | 2440 | bool host_writable) |
Marcelo Tosatti | 1e73f9d | 2008-09-23 13:18:30 -0300 | [diff] [blame] | 2441 | { |
| 2442 | int was_rmapped = 0; |
Marcelo Tosatti | 53a27b3 | 2009-08-05 15:43:58 -0300 | [diff] [blame] | 2443 | int rmap_count; |
Marcelo Tosatti | 1e73f9d | 2008-09-23 13:18:30 -0300 | [diff] [blame] | 2444 | |
| 2445 | pgprintk("%s: spte %llx access %x write_fault %d" |
Xiao Guangrong | 9ad17b10 | 2010-08-28 19:19:42 +0800 | [diff] [blame] | 2446 | " user_fault %d gfn %llx\n", |
Avi Kivity | d555c33 | 2009-06-10 14:24:23 +0300 | [diff] [blame] | 2447 | __func__, *sptep, pt_access, |
Marcelo Tosatti | 1e73f9d | 2008-09-23 13:18:30 -0300 | [diff] [blame] | 2448 | write_fault, user_fault, gfn); |
| 2449 | |
Avi Kivity | d555c33 | 2009-06-10 14:24:23 +0300 | [diff] [blame] | 2450 | if (is_rmap_spte(*sptep)) { |
Marcelo Tosatti | 1e73f9d | 2008-09-23 13:18:30 -0300 | [diff] [blame] | 2451 | /* |
| 2452 | * If we overwrite a PTE page pointer with a 2MB PMD, unlink |
| 2453 | * the parent of the now unreachable PTE. |
| 2454 | */ |
Joerg Roedel | 852e3c1 | 2009-07-27 16:30:44 +0200 | [diff] [blame] | 2455 | if (level > PT_PAGE_TABLE_LEVEL && |
| 2456 | !is_large_pte(*sptep)) { |
Marcelo Tosatti | 1e73f9d | 2008-09-23 13:18:30 -0300 | [diff] [blame] | 2457 | struct kvm_mmu_page *child; |
Avi Kivity | d555c33 | 2009-06-10 14:24:23 +0300 | [diff] [blame] | 2458 | u64 pte = *sptep; |
Marcelo Tosatti | 1e73f9d | 2008-09-23 13:18:30 -0300 | [diff] [blame] | 2459 | |
| 2460 | child = page_header(pte & PT64_BASE_ADDR_MASK); |
Xiao Guangrong | bcdd9a9 | 2011-05-15 23:28:29 +0800 | [diff] [blame] | 2461 | drop_parent_pte(child, sptep); |
Marcelo Tosatti | 3be2264 | 2010-05-28 09:44:59 -0300 | [diff] [blame] | 2462 | kvm_flush_remote_tlbs(vcpu->kvm); |
Avi Kivity | d555c33 | 2009-06-10 14:24:23 +0300 | [diff] [blame] | 2463 | } else if (pfn != spte_to_pfn(*sptep)) { |
Xiao Guangrong | 9ad17b10 | 2010-08-28 19:19:42 +0800 | [diff] [blame] | 2464 | pgprintk("hfn old %llx new %llx\n", |
Avi Kivity | d555c33 | 2009-06-10 14:24:23 +0300 | [diff] [blame] | 2465 | spte_to_pfn(*sptep), pfn); |
Xiao Guangrong | c370795 | 2011-07-12 03:28:04 +0800 | [diff] [blame] | 2466 | drop_spte(vcpu->kvm, sptep); |
Xiao Guangrong | 9154635 | 2010-06-30 16:04:06 +0800 | [diff] [blame] | 2467 | kvm_flush_remote_tlbs(vcpu->kvm); |
Joerg Roedel | 6bed6b9 | 2009-02-18 14:08:59 +0100 | [diff] [blame] | 2468 | } else |
| 2469 | was_rmapped = 1; |
Marcelo Tosatti | 1e73f9d | 2008-09-23 13:18:30 -0300 | [diff] [blame] | 2470 | } |
Joerg Roedel | 852e3c1 | 2009-07-27 16:30:44 +0200 | [diff] [blame] | 2471 | |
Avi Kivity | d555c33 | 2009-06-10 14:24:23 +0300 | [diff] [blame] | 2472 | if (set_spte(vcpu, sptep, pte_access, user_fault, write_fault, |
Xiao Guangrong | 640d9b0 | 2011-07-12 03:24:39 +0800 | [diff] [blame] | 2473 | level, gfn, pfn, speculative, true, |
Lai Jiangshan | 9bdbba1 | 2010-11-19 17:03:22 +0800 | [diff] [blame] | 2474 | host_writable)) { |
Marcelo Tosatti | 1e73f9d | 2008-09-23 13:18:30 -0300 | [diff] [blame] | 2475 | if (write_fault) |
Xiao Guangrong | b90a0e6 | 2011-07-12 03:25:56 +0800 | [diff] [blame] | 2476 | *emulate = 1; |
Xiao Guangrong | 5304efd | 2010-06-08 20:05:57 +0800 | [diff] [blame] | 2477 | kvm_mmu_flush_tlb(vcpu); |
Marcelo Tosatti | a378b4e | 2008-09-23 13:18:31 -0300 | [diff] [blame] | 2478 | } |
Marcelo Tosatti | 1e73f9d | 2008-09-23 13:18:30 -0300 | [diff] [blame] | 2479 | |
Xiao Guangrong | ce88dec | 2011-07-12 03:33:44 +0800 | [diff] [blame] | 2480 | if (unlikely(is_mmio_spte(*sptep) && emulate)) |
| 2481 | *emulate = 1; |
| 2482 | |
Avi Kivity | d555c33 | 2009-06-10 14:24:23 +0300 | [diff] [blame] | 2483 | pgprintk("%s: setting spte %llx\n", __func__, *sptep); |
Xiao Guangrong | 9ad17b10 | 2010-08-28 19:19:42 +0800 | [diff] [blame] | 2484 | pgprintk("instantiating %s PTE (%s) at %llx (%llx) addr %p\n", |
Avi Kivity | d555c33 | 2009-06-10 14:24:23 +0300 | [diff] [blame] | 2485 | is_large_pte(*sptep)? "2MB" : "4kB", |
Joerg Roedel | a205bc1 | 2009-07-09 16:36:01 +0200 | [diff] [blame] | 2486 | *sptep & PT_PRESENT_MASK ?"RW":"R", gfn, |
| 2487 | *sptep, sptep); |
Avi Kivity | d555c33 | 2009-06-10 14:24:23 +0300 | [diff] [blame] | 2488 | if (!was_rmapped && is_large_pte(*sptep)) |
Marcelo Tosatti | 05da455 | 2008-02-23 11:44:30 -0300 | [diff] [blame] | 2489 | ++vcpu->kvm->stat.lpages; |
| 2490 | |
Xiao Guangrong | ffb61bb | 2011-07-12 03:22:01 +0800 | [diff] [blame] | 2491 | if (is_shadow_present_pte(*sptep)) { |
| 2492 | page_header_update_slot(vcpu->kvm, sptep, gfn); |
| 2493 | if (!was_rmapped) { |
| 2494 | rmap_count = rmap_add(vcpu, sptep, gfn); |
| 2495 | if (rmap_count > RMAP_RECYCLE_THRESHOLD) |
| 2496 | rmap_recycle(vcpu, sptep, gfn); |
| 2497 | } |
Avi Kivity | 1c4f1fd | 2007-12-09 17:40:31 +0200 | [diff] [blame] | 2498 | } |
Xiao Guangrong | cb9aaa3 | 2012-08-03 15:42:10 +0800 | [diff] [blame] | 2499 | |
| 2500 | if (!is_error_pfn(pfn)) |
| 2501 | kvm_release_pfn_clean(pfn); |
Avi Kivity | 1c4f1fd | 2007-12-09 17:40:31 +0200 | [diff] [blame] | 2502 | } |
| 2503 | |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 2504 | static void nonpaging_new_cr3(struct kvm_vcpu *vcpu) |
| 2505 | { |
Avi Kivity | e676505 | 2012-07-08 17:16:30 +0300 | [diff] [blame] | 2506 | mmu_free_roots(vcpu); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 2507 | } |
| 2508 | |
Xiao Guangrong | 957ed9e | 2010-08-22 19:12:48 +0800 | [diff] [blame] | 2509 | static pfn_t pte_prefetch_gfn_to_pfn(struct kvm_vcpu *vcpu, gfn_t gfn, |
| 2510 | bool no_dirty_log) |
| 2511 | { |
| 2512 | struct kvm_memory_slot *slot; |
Xiao Guangrong | 957ed9e | 2010-08-22 19:12:48 +0800 | [diff] [blame] | 2513 | |
Xiao Guangrong | 5d163b1 | 2011-03-09 15:43:00 +0800 | [diff] [blame] | 2514 | slot = gfn_to_memslot_dirty_bitmap(vcpu, gfn, no_dirty_log); |
Xiao Guangrong | 903816f | 2012-07-17 21:54:11 +0800 | [diff] [blame] | 2515 | if (!slot) |
Xiao Guangrong | 6c8ee57 | 2012-08-03 15:37:54 +0800 | [diff] [blame] | 2516 | return KVM_PFN_ERR_FAULT; |
Xiao Guangrong | 957ed9e | 2010-08-22 19:12:48 +0800 | [diff] [blame] | 2517 | |
Xiao Guangrong | 037d92d | 2012-08-21 10:59:12 +0800 | [diff] [blame] | 2518 | return gfn_to_pfn_memslot_atomic(slot, gfn); |
Xiao Guangrong | 957ed9e | 2010-08-22 19:12:48 +0800 | [diff] [blame] | 2519 | } |
| 2520 | |
| 2521 | static int direct_pte_prefetch_many(struct kvm_vcpu *vcpu, |
| 2522 | struct kvm_mmu_page *sp, |
| 2523 | u64 *start, u64 *end) |
| 2524 | { |
| 2525 | struct page *pages[PTE_PREFETCH_NUM]; |
| 2526 | unsigned access = sp->role.access; |
| 2527 | int i, ret; |
| 2528 | gfn_t gfn; |
| 2529 | |
| 2530 | gfn = kvm_mmu_page_get_gfn(sp, start - sp->spt); |
Xiao Guangrong | 5d163b1 | 2011-03-09 15:43:00 +0800 | [diff] [blame] | 2531 | if (!gfn_to_memslot_dirty_bitmap(vcpu, gfn, access & ACC_WRITE_MASK)) |
Xiao Guangrong | 957ed9e | 2010-08-22 19:12:48 +0800 | [diff] [blame] | 2532 | return -1; |
| 2533 | |
| 2534 | ret = gfn_to_page_many_atomic(vcpu->kvm, gfn, pages, end - start); |
| 2535 | if (ret <= 0) |
| 2536 | return -1; |
| 2537 | |
| 2538 | for (i = 0; i < ret; i++, gfn++, start++) |
| 2539 | mmu_set_spte(vcpu, start, ACC_ALL, |
Xiao Guangrong | 640d9b0 | 2011-07-12 03:24:39 +0800 | [diff] [blame] | 2540 | access, 0, 0, NULL, |
Xiao Guangrong | 957ed9e | 2010-08-22 19:12:48 +0800 | [diff] [blame] | 2541 | sp->role.level, gfn, |
| 2542 | page_to_pfn(pages[i]), true, true); |
| 2543 | |
| 2544 | return 0; |
| 2545 | } |
| 2546 | |
| 2547 | static void __direct_pte_prefetch(struct kvm_vcpu *vcpu, |
| 2548 | struct kvm_mmu_page *sp, u64 *sptep) |
| 2549 | { |
| 2550 | u64 *spte, *start = NULL; |
| 2551 | int i; |
| 2552 | |
| 2553 | WARN_ON(!sp->role.direct); |
| 2554 | |
| 2555 | i = (sptep - sp->spt) & ~(PTE_PREFETCH_NUM - 1); |
| 2556 | spte = sp->spt + i; |
| 2557 | |
| 2558 | for (i = 0; i < PTE_PREFETCH_NUM; i++, spte++) { |
Xiao Guangrong | c370795 | 2011-07-12 03:28:04 +0800 | [diff] [blame] | 2559 | if (is_shadow_present_pte(*spte) || spte == sptep) { |
Xiao Guangrong | 957ed9e | 2010-08-22 19:12:48 +0800 | [diff] [blame] | 2560 | if (!start) |
| 2561 | continue; |
| 2562 | if (direct_pte_prefetch_many(vcpu, sp, start, spte) < 0) |
| 2563 | break; |
| 2564 | start = NULL; |
| 2565 | } else if (!start) |
| 2566 | start = spte; |
| 2567 | } |
| 2568 | } |
| 2569 | |
| 2570 | static void direct_pte_prefetch(struct kvm_vcpu *vcpu, u64 *sptep) |
| 2571 | { |
| 2572 | struct kvm_mmu_page *sp; |
| 2573 | |
| 2574 | /* |
| 2575 | * Since it's no accessed bit on EPT, it's no way to |
| 2576 | * distinguish between actually accessed translations |
| 2577 | * and prefetched, so disable pte prefetch if EPT is |
| 2578 | * enabled. |
| 2579 | */ |
| 2580 | if (!shadow_accessed_mask) |
| 2581 | return; |
| 2582 | |
| 2583 | sp = page_header(__pa(sptep)); |
| 2584 | if (sp->role.level > PT_PAGE_TABLE_LEVEL) |
| 2585 | return; |
| 2586 | |
| 2587 | __direct_pte_prefetch(vcpu, sp, sptep); |
| 2588 | } |
| 2589 | |
Joerg Roedel | 4d9976b | 2008-02-07 13:47:42 +0100 | [diff] [blame] | 2590 | 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] | 2591 | int map_writable, int level, gfn_t gfn, pfn_t pfn, |
| 2592 | bool prefault) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 2593 | { |
Avi Kivity | 9f652d2 | 2008-12-25 14:54:25 +0200 | [diff] [blame] | 2594 | struct kvm_shadow_walk_iterator iterator; |
| 2595 | struct kvm_mmu_page *sp; |
Xiao Guangrong | b90a0e6 | 2011-07-12 03:25:56 +0800 | [diff] [blame] | 2596 | int emulate = 0; |
Avi Kivity | 9f652d2 | 2008-12-25 14:54:25 +0200 | [diff] [blame] | 2597 | gfn_t pseudo_gfn; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 2598 | |
Avi Kivity | 9f652d2 | 2008-12-25 14:54:25 +0200 | [diff] [blame] | 2599 | for_each_shadow_entry(vcpu, (u64)gfn << PAGE_SHIFT, iterator) { |
Joerg Roedel | 852e3c1 | 2009-07-27 16:30:44 +0200 | [diff] [blame] | 2600 | if (iterator.level == level) { |
Marcelo Tosatti | 612819c | 2010-10-22 14:18:18 -0200 | [diff] [blame] | 2601 | unsigned pte_access = ACC_ALL; |
| 2602 | |
Marcelo Tosatti | 612819c | 2010-10-22 14:18:18 -0200 | [diff] [blame] | 2603 | mmu_set_spte(vcpu, iterator.sptep, ACC_ALL, pte_access, |
Xiao Guangrong | b90a0e6 | 2011-07-12 03:25:56 +0800 | [diff] [blame] | 2604 | 0, write, &emulate, |
Xiao Guangrong | 2ec4739 | 2010-12-07 10:34:42 +0800 | [diff] [blame] | 2605 | level, gfn, pfn, prefault, map_writable); |
Xiao Guangrong | 957ed9e | 2010-08-22 19:12:48 +0800 | [diff] [blame] | 2606 | direct_pte_prefetch(vcpu, iterator.sptep); |
Avi Kivity | 9f652d2 | 2008-12-25 14:54:25 +0200 | [diff] [blame] | 2607 | ++vcpu->stat.pf_fixed; |
| 2608 | break; |
| 2609 | } |
| 2610 | |
Xiao Guangrong | c370795 | 2011-07-12 03:28:04 +0800 | [diff] [blame] | 2611 | if (!is_shadow_present_pte(*iterator.sptep)) { |
Lai Jiangshan | c9fa0b3 | 2010-05-26 16:48:25 +0800 | [diff] [blame] | 2612 | u64 base_addr = iterator.addr; |
| 2613 | |
| 2614 | base_addr &= PT64_LVL_ADDR_MASK(iterator.level); |
| 2615 | pseudo_gfn = base_addr >> PAGE_SHIFT; |
Avi Kivity | 9f652d2 | 2008-12-25 14:54:25 +0200 | [diff] [blame] | 2616 | sp = kvm_mmu_get_page(vcpu, pseudo_gfn, iterator.addr, |
| 2617 | iterator.level - 1, |
| 2618 | 1, ACC_ALL, iterator.sptep); |
| 2619 | if (!sp) { |
| 2620 | pgprintk("nonpaging_map: ENOMEM\n"); |
| 2621 | kvm_release_pfn_clean(pfn); |
| 2622 | return -ENOMEM; |
| 2623 | } |
| 2624 | |
Xiao Guangrong | 1df9f2d | 2011-07-12 03:30:35 +0800 | [diff] [blame] | 2625 | mmu_spte_set(iterator.sptep, |
| 2626 | __pa(sp->spt) |
| 2627 | | PT_PRESENT_MASK | PT_WRITABLE_MASK |
| 2628 | | shadow_user_mask | shadow_x_mask |
| 2629 | | shadow_accessed_mask); |
Avi Kivity | 9f652d2 | 2008-12-25 14:54:25 +0200 | [diff] [blame] | 2630 | } |
| 2631 | } |
Xiao Guangrong | b90a0e6 | 2011-07-12 03:25:56 +0800 | [diff] [blame] | 2632 | return emulate; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 2633 | } |
| 2634 | |
Huang Ying | 77db5cb | 2010-10-08 16:24:15 +0800 | [diff] [blame] | 2635 | 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] | 2636 | { |
Huang Ying | 77db5cb | 2010-10-08 16:24:15 +0800 | [diff] [blame] | 2637 | siginfo_t info; |
Huang Ying | bf99815 | 2010-05-31 14:28:19 +0800 | [diff] [blame] | 2638 | |
Huang Ying | 77db5cb | 2010-10-08 16:24:15 +0800 | [diff] [blame] | 2639 | info.si_signo = SIGBUS; |
| 2640 | info.si_errno = 0; |
| 2641 | info.si_code = BUS_MCEERR_AR; |
| 2642 | info.si_addr = (void __user *)address; |
| 2643 | info.si_addr_lsb = PAGE_SHIFT; |
| 2644 | |
| 2645 | send_sig_info(SIGBUS, &info, tsk); |
Huang Ying | bf99815 | 2010-05-31 14:28:19 +0800 | [diff] [blame] | 2646 | } |
| 2647 | |
Xiao Guangrong | d7c5520 | 2011-07-12 03:29:38 +0800 | [diff] [blame] | 2648 | 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] | 2649 | { |
Xiao Guangrong | 4d8b81a | 2012-08-21 11:02:51 +0800 | [diff] [blame^] | 2650 | /* |
| 2651 | * Do not cache the mmio info caused by writing the readonly gfn |
| 2652 | * into the spte otherwise read access on readonly gfn also can |
| 2653 | * caused mmio page fault and treat it as mmio access. |
| 2654 | * Return 1 to tell kvm to emulate it. |
| 2655 | */ |
| 2656 | if (pfn == KVM_PFN_ERR_RO_FAULT) |
| 2657 | return 1; |
| 2658 | |
Xiao Guangrong | e6c1502 | 2012-08-03 15:38:36 +0800 | [diff] [blame] | 2659 | if (pfn == KVM_PFN_ERR_HWPOISON) { |
Xiao Guangrong | bebb106 | 2011-07-12 03:23:20 +0800 | [diff] [blame] | 2660 | kvm_send_hwpoison_signal(gfn_to_hva(vcpu->kvm, gfn), current); |
Huang Ying | bf99815 | 2010-05-31 14:28:19 +0800 | [diff] [blame] | 2661 | return 0; |
Xiao Guangrong | d7c5520 | 2011-07-12 03:29:38 +0800 | [diff] [blame] | 2662 | } |
Gleb Natapov | edba23e | 2010-07-07 20:16:45 +0300 | [diff] [blame] | 2663 | |
Xiao Guangrong | d7c5520 | 2011-07-12 03:29:38 +0800 | [diff] [blame] | 2664 | return -EFAULT; |
Huang Ying | bf99815 | 2010-05-31 14:28:19 +0800 | [diff] [blame] | 2665 | } |
| 2666 | |
Andrea Arcangeli | 936a5fe | 2011-01-13 15:46:48 -0800 | [diff] [blame] | 2667 | static void transparent_hugepage_adjust(struct kvm_vcpu *vcpu, |
| 2668 | gfn_t *gfnp, pfn_t *pfnp, int *levelp) |
| 2669 | { |
| 2670 | pfn_t pfn = *pfnp; |
| 2671 | gfn_t gfn = *gfnp; |
| 2672 | int level = *levelp; |
| 2673 | |
| 2674 | /* |
| 2675 | * Check if it's a transparent hugepage. If this would be an |
| 2676 | * hugetlbfs page, level wouldn't be set to |
| 2677 | * PT_PAGE_TABLE_LEVEL and there would be no adjustment done |
| 2678 | * here. |
| 2679 | */ |
| 2680 | if (!is_error_pfn(pfn) && !kvm_is_mmio_pfn(pfn) && |
| 2681 | level == PT_PAGE_TABLE_LEVEL && |
| 2682 | PageTransCompound(pfn_to_page(pfn)) && |
| 2683 | !has_wrprotected_page(vcpu->kvm, gfn, PT_DIRECTORY_LEVEL)) { |
| 2684 | unsigned long mask; |
| 2685 | /* |
| 2686 | * mmu_notifier_retry was successful and we hold the |
| 2687 | * mmu_lock here, so the pmd can't become splitting |
| 2688 | * from under us, and in turn |
| 2689 | * __split_huge_page_refcount() can't run from under |
| 2690 | * us and we can safely transfer the refcount from |
| 2691 | * PG_tail to PG_head as we switch the pfn to tail to |
| 2692 | * head. |
| 2693 | */ |
| 2694 | *levelp = level = PT_DIRECTORY_LEVEL; |
| 2695 | mask = KVM_PAGES_PER_HPAGE(level) - 1; |
| 2696 | VM_BUG_ON((gfn & mask) != (pfn & mask)); |
| 2697 | if (pfn & mask) { |
| 2698 | gfn &= ~mask; |
| 2699 | *gfnp = gfn; |
| 2700 | kvm_release_pfn_clean(pfn); |
| 2701 | pfn &= ~mask; |
Xiao Guangrong | c358666 | 2012-05-28 14:10:43 +0800 | [diff] [blame] | 2702 | kvm_get_pfn(pfn); |
Andrea Arcangeli | 936a5fe | 2011-01-13 15:46:48 -0800 | [diff] [blame] | 2703 | *pfnp = pfn; |
| 2704 | } |
| 2705 | } |
| 2706 | } |
| 2707 | |
Xiao Guangrong | d7c5520 | 2011-07-12 03:29:38 +0800 | [diff] [blame] | 2708 | static bool mmu_invalid_pfn(pfn_t pfn) |
| 2709 | { |
Xiao Guangrong | ce88dec | 2011-07-12 03:33:44 +0800 | [diff] [blame] | 2710 | return unlikely(is_invalid_pfn(pfn)); |
Xiao Guangrong | d7c5520 | 2011-07-12 03:29:38 +0800 | [diff] [blame] | 2711 | } |
| 2712 | |
| 2713 | static bool handle_abnormal_pfn(struct kvm_vcpu *vcpu, gva_t gva, gfn_t gfn, |
| 2714 | pfn_t pfn, unsigned access, int *ret_val) |
| 2715 | { |
| 2716 | bool ret = true; |
| 2717 | |
| 2718 | /* The pfn is invalid, report the error! */ |
| 2719 | if (unlikely(is_invalid_pfn(pfn))) { |
| 2720 | *ret_val = kvm_handle_bad_page(vcpu, gfn, pfn); |
| 2721 | goto exit; |
| 2722 | } |
| 2723 | |
Xiao Guangrong | ce88dec | 2011-07-12 03:33:44 +0800 | [diff] [blame] | 2724 | if (unlikely(is_noslot_pfn(pfn))) |
Xiao Guangrong | d7c5520 | 2011-07-12 03:29:38 +0800 | [diff] [blame] | 2725 | vcpu_cache_mmio_info(vcpu, gva, gfn, access); |
Xiao Guangrong | d7c5520 | 2011-07-12 03:29:38 +0800 | [diff] [blame] | 2726 | |
| 2727 | ret = false; |
| 2728 | exit: |
| 2729 | return ret; |
| 2730 | } |
| 2731 | |
Xiao Guangrong | c7ba5b4 | 2012-06-20 15:59:18 +0800 | [diff] [blame] | 2732 | static bool page_fault_can_be_fast(struct kvm_vcpu *vcpu, u32 error_code) |
| 2733 | { |
| 2734 | /* |
| 2735 | * #PF can be fast only if the shadow page table is present and it |
| 2736 | * is caused by write-protect, that means we just need change the |
| 2737 | * W bit of the spte which can be done out of mmu-lock. |
| 2738 | */ |
| 2739 | if (!(error_code & PFERR_PRESENT_MASK) || |
| 2740 | !(error_code & PFERR_WRITE_MASK)) |
| 2741 | return false; |
| 2742 | |
| 2743 | return true; |
| 2744 | } |
| 2745 | |
| 2746 | static bool |
| 2747 | fast_pf_fix_direct_spte(struct kvm_vcpu *vcpu, u64 *sptep, u64 spte) |
| 2748 | { |
| 2749 | struct kvm_mmu_page *sp = page_header(__pa(sptep)); |
| 2750 | gfn_t gfn; |
| 2751 | |
| 2752 | WARN_ON(!sp->role.direct); |
| 2753 | |
| 2754 | /* |
| 2755 | * The gfn of direct spte is stable since it is calculated |
| 2756 | * by sp->gfn. |
| 2757 | */ |
| 2758 | gfn = kvm_mmu_page_get_gfn(sp, sptep - sp->spt); |
| 2759 | |
| 2760 | if (cmpxchg64(sptep, spte, spte | PT_WRITABLE_MASK) == spte) |
| 2761 | mark_page_dirty(vcpu->kvm, gfn); |
| 2762 | |
| 2763 | return true; |
| 2764 | } |
| 2765 | |
| 2766 | /* |
| 2767 | * Return value: |
| 2768 | * - true: let the vcpu to access on the same address again. |
| 2769 | * - false: let the real page fault path to fix it. |
| 2770 | */ |
| 2771 | static bool fast_page_fault(struct kvm_vcpu *vcpu, gva_t gva, int level, |
| 2772 | u32 error_code) |
| 2773 | { |
| 2774 | struct kvm_shadow_walk_iterator iterator; |
| 2775 | bool ret = false; |
| 2776 | u64 spte = 0ull; |
| 2777 | |
| 2778 | if (!page_fault_can_be_fast(vcpu, error_code)) |
| 2779 | return false; |
| 2780 | |
| 2781 | walk_shadow_page_lockless_begin(vcpu); |
| 2782 | for_each_shadow_entry_lockless(vcpu, gva, iterator, spte) |
| 2783 | if (!is_shadow_present_pte(spte) || iterator.level < level) |
| 2784 | break; |
| 2785 | |
| 2786 | /* |
| 2787 | * If the mapping has been changed, let the vcpu fault on the |
| 2788 | * same address again. |
| 2789 | */ |
| 2790 | if (!is_rmap_spte(spte)) { |
| 2791 | ret = true; |
| 2792 | goto exit; |
| 2793 | } |
| 2794 | |
| 2795 | if (!is_last_spte(spte, level)) |
| 2796 | goto exit; |
| 2797 | |
| 2798 | /* |
| 2799 | * Check if it is a spurious fault caused by TLB lazily flushed. |
| 2800 | * |
| 2801 | * Need not check the access of upper level table entries since |
| 2802 | * they are always ACC_ALL. |
| 2803 | */ |
| 2804 | if (is_writable_pte(spte)) { |
| 2805 | ret = true; |
| 2806 | goto exit; |
| 2807 | } |
| 2808 | |
| 2809 | /* |
| 2810 | * Currently, to simplify the code, only the spte write-protected |
| 2811 | * by dirty-log can be fast fixed. |
| 2812 | */ |
| 2813 | if (!spte_is_locklessly_modifiable(spte)) |
| 2814 | goto exit; |
| 2815 | |
| 2816 | /* |
| 2817 | * Currently, fast page fault only works for direct mapping since |
| 2818 | * the gfn is not stable for indirect shadow page. |
| 2819 | * See Documentation/virtual/kvm/locking.txt to get more detail. |
| 2820 | */ |
| 2821 | ret = fast_pf_fix_direct_spte(vcpu, iterator.sptep, spte); |
| 2822 | exit: |
Xiao Guangrong | a72faf2 | 2012-06-20 15:59:41 +0800 | [diff] [blame] | 2823 | trace_fast_page_fault(vcpu, gva, error_code, iterator.sptep, |
| 2824 | spte, ret); |
Xiao Guangrong | c7ba5b4 | 2012-06-20 15:59:18 +0800 | [diff] [blame] | 2825 | walk_shadow_page_lockless_end(vcpu); |
| 2826 | |
| 2827 | return ret; |
| 2828 | } |
| 2829 | |
Xiao Guangrong | 78b2c54 | 2010-12-07 10:48:06 +0800 | [diff] [blame] | 2830 | 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] | 2831 | gva_t gva, pfn_t *pfn, bool write, bool *writable); |
| 2832 | |
Xiao Guangrong | c7ba5b4 | 2012-06-20 15:59:18 +0800 | [diff] [blame] | 2833 | static int nonpaging_map(struct kvm_vcpu *vcpu, gva_t v, u32 error_code, |
| 2834 | gfn_t gfn, bool prefault) |
Marcelo Tosatti | 10589a4 | 2007-12-20 19:18:22 -0500 | [diff] [blame] | 2835 | { |
| 2836 | int r; |
Joerg Roedel | 852e3c1 | 2009-07-27 16:30:44 +0200 | [diff] [blame] | 2837 | int level; |
Andrea Arcangeli | 936a5fe | 2011-01-13 15:46:48 -0800 | [diff] [blame] | 2838 | int force_pt_level; |
Anthony Liguori | 35149e2 | 2008-04-02 14:46:56 -0500 | [diff] [blame] | 2839 | pfn_t pfn; |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 2840 | unsigned long mmu_seq; |
Xiao Guangrong | c7ba5b4 | 2012-06-20 15:59:18 +0800 | [diff] [blame] | 2841 | bool map_writable, write = error_code & PFERR_WRITE_MASK; |
Marcelo Tosatti | aaee2c9 | 2007-12-20 19:18:26 -0500 | [diff] [blame] | 2842 | |
Andrea Arcangeli | 936a5fe | 2011-01-13 15:46:48 -0800 | [diff] [blame] | 2843 | force_pt_level = mapping_level_dirty_bitmap(vcpu, gfn); |
| 2844 | if (likely(!force_pt_level)) { |
| 2845 | level = mapping_level(vcpu, gfn); |
| 2846 | /* |
| 2847 | * This path builds a PAE pagetable - so we can map |
| 2848 | * 2mb pages at maximum. Therefore check if the level |
| 2849 | * is larger than that. |
| 2850 | */ |
| 2851 | if (level > PT_DIRECTORY_LEVEL) |
| 2852 | level = PT_DIRECTORY_LEVEL; |
Joerg Roedel | 852e3c1 | 2009-07-27 16:30:44 +0200 | [diff] [blame] | 2853 | |
Andrea Arcangeli | 936a5fe | 2011-01-13 15:46:48 -0800 | [diff] [blame] | 2854 | gfn &= ~(KVM_PAGES_PER_HPAGE(level) - 1); |
| 2855 | } else |
| 2856 | level = PT_PAGE_TABLE_LEVEL; |
Marcelo Tosatti | 05da455 | 2008-02-23 11:44:30 -0300 | [diff] [blame] | 2857 | |
Xiao Guangrong | c7ba5b4 | 2012-06-20 15:59:18 +0800 | [diff] [blame] | 2858 | if (fast_page_fault(vcpu, v, level, error_code)) |
| 2859 | return 0; |
| 2860 | |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 2861 | mmu_seq = vcpu->kvm->mmu_notifier_seq; |
Marcelo Tosatti | 4c2155c | 2008-09-16 20:54:47 -0300 | [diff] [blame] | 2862 | smp_rmb(); |
Xiao Guangrong | 060c2ab | 2010-11-12 14:49:11 +0800 | [diff] [blame] | 2863 | |
Xiao Guangrong | 78b2c54 | 2010-12-07 10:48:06 +0800 | [diff] [blame] | 2864 | if (try_async_pf(vcpu, prefault, gfn, v, &pfn, write, &map_writable)) |
Xiao Guangrong | 060c2ab | 2010-11-12 14:49:11 +0800 | [diff] [blame] | 2865 | return 0; |
Marcelo Tosatti | aaee2c9 | 2007-12-20 19:18:26 -0500 | [diff] [blame] | 2866 | |
Xiao Guangrong | d7c5520 | 2011-07-12 03:29:38 +0800 | [diff] [blame] | 2867 | if (handle_abnormal_pfn(vcpu, v, gfn, pfn, ACC_ALL, &r)) |
| 2868 | return r; |
Avi Kivity | d196e34 | 2008-01-24 11:44:11 +0200 | [diff] [blame] | 2869 | |
Marcelo Tosatti | aaee2c9 | 2007-12-20 19:18:26 -0500 | [diff] [blame] | 2870 | spin_lock(&vcpu->kvm->mmu_lock); |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 2871 | if (mmu_notifier_retry(vcpu, mmu_seq)) |
| 2872 | goto out_unlock; |
Avi Kivity | eb787d1 | 2007-12-31 15:27:49 +0200 | [diff] [blame] | 2873 | kvm_mmu_free_some_pages(vcpu); |
Andrea Arcangeli | 936a5fe | 2011-01-13 15:46:48 -0800 | [diff] [blame] | 2874 | if (likely(!force_pt_level)) |
| 2875 | transparent_hugepage_adjust(vcpu, &gfn, &pfn, &level); |
Xiao Guangrong | 2ec4739 | 2010-12-07 10:34:42 +0800 | [diff] [blame] | 2876 | r = __direct_map(vcpu, v, write, map_writable, level, gfn, pfn, |
| 2877 | prefault); |
Marcelo Tosatti | aaee2c9 | 2007-12-20 19:18:26 -0500 | [diff] [blame] | 2878 | spin_unlock(&vcpu->kvm->mmu_lock); |
| 2879 | |
Marcelo Tosatti | aaee2c9 | 2007-12-20 19:18:26 -0500 | [diff] [blame] | 2880 | |
Marcelo Tosatti | 10589a4 | 2007-12-20 19:18:22 -0500 | [diff] [blame] | 2881 | return r; |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 2882 | |
| 2883 | out_unlock: |
| 2884 | spin_unlock(&vcpu->kvm->mmu_lock); |
| 2885 | kvm_release_pfn_clean(pfn); |
| 2886 | return 0; |
Marcelo Tosatti | 10589a4 | 2007-12-20 19:18:22 -0500 | [diff] [blame] | 2887 | } |
| 2888 | |
| 2889 | |
Avi Kivity | 17ac10a | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 2890 | static void mmu_free_roots(struct kvm_vcpu *vcpu) |
| 2891 | { |
| 2892 | int i; |
Avi Kivity | 4db3531 | 2007-11-21 15:28:32 +0200 | [diff] [blame] | 2893 | struct kvm_mmu_page *sp; |
Xiao Guangrong | d98ba05 | 2010-06-04 21:55:29 +0800 | [diff] [blame] | 2894 | LIST_HEAD(invalid_list); |
Avi Kivity | 17ac10a | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 2895 | |
Zhang Xiantao | ad312c7 | 2007-12-13 23:50:52 +0800 | [diff] [blame] | 2896 | if (!VALID_PAGE(vcpu->arch.mmu.root_hpa)) |
Avi Kivity | 7b53aa5 | 2007-06-05 12:17:03 +0300 | [diff] [blame] | 2897 | return; |
Marcelo Tosatti | aaee2c9 | 2007-12-20 19:18:26 -0500 | [diff] [blame] | 2898 | spin_lock(&vcpu->kvm->mmu_lock); |
Joerg Roedel | 81407ca | 2010-09-10 17:31:00 +0200 | [diff] [blame] | 2899 | if (vcpu->arch.mmu.shadow_root_level == PT64_ROOT_LEVEL && |
| 2900 | (vcpu->arch.mmu.root_level == PT64_ROOT_LEVEL || |
| 2901 | vcpu->arch.mmu.direct_map)) { |
Zhang Xiantao | ad312c7 | 2007-12-13 23:50:52 +0800 | [diff] [blame] | 2902 | hpa_t root = vcpu->arch.mmu.root_hpa; |
Avi Kivity | 17ac10a | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 2903 | |
Avi Kivity | 4db3531 | 2007-11-21 15:28:32 +0200 | [diff] [blame] | 2904 | sp = page_header(root); |
| 2905 | --sp->root_count; |
Xiao Guangrong | d98ba05 | 2010-06-04 21:55:29 +0800 | [diff] [blame] | 2906 | if (!sp->root_count && sp->role.invalid) { |
| 2907 | kvm_mmu_prepare_zap_page(vcpu->kvm, sp, &invalid_list); |
| 2908 | kvm_mmu_commit_zap_page(vcpu->kvm, &invalid_list); |
| 2909 | } |
Zhang Xiantao | ad312c7 | 2007-12-13 23:50:52 +0800 | [diff] [blame] | 2910 | vcpu->arch.mmu.root_hpa = INVALID_PAGE; |
Marcelo Tosatti | aaee2c9 | 2007-12-20 19:18:26 -0500 | [diff] [blame] | 2911 | spin_unlock(&vcpu->kvm->mmu_lock); |
Avi Kivity | 17ac10a | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 2912 | return; |
| 2913 | } |
Avi Kivity | 17ac10a | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 2914 | for (i = 0; i < 4; ++i) { |
Zhang Xiantao | ad312c7 | 2007-12-13 23:50:52 +0800 | [diff] [blame] | 2915 | hpa_t root = vcpu->arch.mmu.pae_root[i]; |
Avi Kivity | 17ac10a | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 2916 | |
Avi Kivity | 417726a | 2007-04-12 17:35:58 +0300 | [diff] [blame] | 2917 | if (root) { |
Avi Kivity | 417726a | 2007-04-12 17:35:58 +0300 | [diff] [blame] | 2918 | root &= PT64_BASE_ADDR_MASK; |
Avi Kivity | 4db3531 | 2007-11-21 15:28:32 +0200 | [diff] [blame] | 2919 | sp = page_header(root); |
| 2920 | --sp->root_count; |
Marcelo Tosatti | 2e53d63 | 2008-02-20 14:47:24 -0500 | [diff] [blame] | 2921 | if (!sp->root_count && sp->role.invalid) |
Xiao Guangrong | d98ba05 | 2010-06-04 21:55:29 +0800 | [diff] [blame] | 2922 | kvm_mmu_prepare_zap_page(vcpu->kvm, sp, |
| 2923 | &invalid_list); |
Avi Kivity | 417726a | 2007-04-12 17:35:58 +0300 | [diff] [blame] | 2924 | } |
Zhang Xiantao | ad312c7 | 2007-12-13 23:50:52 +0800 | [diff] [blame] | 2925 | vcpu->arch.mmu.pae_root[i] = INVALID_PAGE; |
Avi Kivity | 17ac10a | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 2926 | } |
Xiao Guangrong | d98ba05 | 2010-06-04 21:55:29 +0800 | [diff] [blame] | 2927 | kvm_mmu_commit_zap_page(vcpu->kvm, &invalid_list); |
Marcelo Tosatti | aaee2c9 | 2007-12-20 19:18:26 -0500 | [diff] [blame] | 2928 | spin_unlock(&vcpu->kvm->mmu_lock); |
Zhang Xiantao | ad312c7 | 2007-12-13 23:50:52 +0800 | [diff] [blame] | 2929 | vcpu->arch.mmu.root_hpa = INVALID_PAGE; |
Avi Kivity | 17ac10a | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 2930 | } |
| 2931 | |
Marcelo Tosatti | 8986ecc | 2009-05-12 18:55:45 -0300 | [diff] [blame] | 2932 | static int mmu_check_root(struct kvm_vcpu *vcpu, gfn_t root_gfn) |
| 2933 | { |
| 2934 | int ret = 0; |
| 2935 | |
| 2936 | if (!kvm_is_visible_gfn(vcpu->kvm, root_gfn)) { |
Avi Kivity | a8eeb04 | 2010-05-10 12:34:53 +0300 | [diff] [blame] | 2937 | kvm_make_request(KVM_REQ_TRIPLE_FAULT, vcpu); |
Marcelo Tosatti | 8986ecc | 2009-05-12 18:55:45 -0300 | [diff] [blame] | 2938 | ret = 1; |
| 2939 | } |
| 2940 | |
| 2941 | return ret; |
| 2942 | } |
| 2943 | |
Joerg Roedel | 651dd37 | 2010-09-10 17:30:59 +0200 | [diff] [blame] | 2944 | static int mmu_alloc_direct_roots(struct kvm_vcpu *vcpu) |
| 2945 | { |
| 2946 | struct kvm_mmu_page *sp; |
Avi Kivity | 7ebaf15 | 2010-10-03 18:51:39 +0200 | [diff] [blame] | 2947 | unsigned i; |
Joerg Roedel | 651dd37 | 2010-09-10 17:30:59 +0200 | [diff] [blame] | 2948 | |
| 2949 | if (vcpu->arch.mmu.shadow_root_level == PT64_ROOT_LEVEL) { |
| 2950 | spin_lock(&vcpu->kvm->mmu_lock); |
| 2951 | kvm_mmu_free_some_pages(vcpu); |
| 2952 | sp = kvm_mmu_get_page(vcpu, 0, 0, PT64_ROOT_LEVEL, |
| 2953 | 1, ACC_ALL, NULL); |
| 2954 | ++sp->root_count; |
| 2955 | spin_unlock(&vcpu->kvm->mmu_lock); |
| 2956 | vcpu->arch.mmu.root_hpa = __pa(sp->spt); |
| 2957 | } else if (vcpu->arch.mmu.shadow_root_level == PT32E_ROOT_LEVEL) { |
| 2958 | for (i = 0; i < 4; ++i) { |
| 2959 | hpa_t root = vcpu->arch.mmu.pae_root[i]; |
| 2960 | |
| 2961 | ASSERT(!VALID_PAGE(root)); |
| 2962 | spin_lock(&vcpu->kvm->mmu_lock); |
| 2963 | kvm_mmu_free_some_pages(vcpu); |
Avi Kivity | 649497d | 2010-12-28 12:09:07 +0200 | [diff] [blame] | 2964 | sp = kvm_mmu_get_page(vcpu, i << (30 - PAGE_SHIFT), |
| 2965 | i << 30, |
Joerg Roedel | 651dd37 | 2010-09-10 17:30:59 +0200 | [diff] [blame] | 2966 | PT32_ROOT_LEVEL, 1, ACC_ALL, |
| 2967 | NULL); |
| 2968 | root = __pa(sp->spt); |
| 2969 | ++sp->root_count; |
| 2970 | spin_unlock(&vcpu->kvm->mmu_lock); |
| 2971 | vcpu->arch.mmu.pae_root[i] = root | PT_PRESENT_MASK; |
Joerg Roedel | 651dd37 | 2010-09-10 17:30:59 +0200 | [diff] [blame] | 2972 | } |
Xiao Guangrong | 6292757 | 2010-09-27 18:02:12 +0800 | [diff] [blame] | 2973 | vcpu->arch.mmu.root_hpa = __pa(vcpu->arch.mmu.pae_root); |
Joerg Roedel | 651dd37 | 2010-09-10 17:30:59 +0200 | [diff] [blame] | 2974 | } else |
| 2975 | BUG(); |
| 2976 | |
| 2977 | return 0; |
| 2978 | } |
| 2979 | |
| 2980 | static int mmu_alloc_shadow_roots(struct kvm_vcpu *vcpu) |
Avi Kivity | 17ac10a | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 2981 | { |
Avi Kivity | 4db3531 | 2007-11-21 15:28:32 +0200 | [diff] [blame] | 2982 | struct kvm_mmu_page *sp; |
Joerg Roedel | 81407ca | 2010-09-10 17:31:00 +0200 | [diff] [blame] | 2983 | u64 pdptr, pm_mask; |
| 2984 | gfn_t root_gfn; |
| 2985 | int i; |
Avi Kivity | 3bb65a2 | 2007-01-05 16:36:51 -0800 | [diff] [blame] | 2986 | |
Joerg Roedel | 5777ed3 | 2010-09-10 17:30:42 +0200 | [diff] [blame] | 2987 | root_gfn = vcpu->arch.mmu.get_cr3(vcpu) >> PAGE_SHIFT; |
Avi Kivity | 17ac10a | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 2988 | |
Joerg Roedel | 651dd37 | 2010-09-10 17:30:59 +0200 | [diff] [blame] | 2989 | if (mmu_check_root(vcpu, root_gfn)) |
| 2990 | return 1; |
| 2991 | |
| 2992 | /* |
| 2993 | * Do we shadow a long mode page table? If so we need to |
| 2994 | * write-protect the guests page table root. |
| 2995 | */ |
| 2996 | if (vcpu->arch.mmu.root_level == PT64_ROOT_LEVEL) { |
Zhang Xiantao | ad312c7 | 2007-12-13 23:50:52 +0800 | [diff] [blame] | 2997 | hpa_t root = vcpu->arch.mmu.root_hpa; |
Avi Kivity | 17ac10a | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 2998 | |
| 2999 | ASSERT(!VALID_PAGE(root)); |
Joerg Roedel | 651dd37 | 2010-09-10 17:30:59 +0200 | [diff] [blame] | 3000 | |
Avi Kivity | 8facbbf | 2010-05-04 12:58:32 +0300 | [diff] [blame] | 3001 | spin_lock(&vcpu->kvm->mmu_lock); |
Marcelo Tosatti | 24955b6 | 2010-05-12 21:00:35 -0300 | [diff] [blame] | 3002 | kvm_mmu_free_some_pages(vcpu); |
Joerg Roedel | 651dd37 | 2010-09-10 17:30:59 +0200 | [diff] [blame] | 3003 | sp = kvm_mmu_get_page(vcpu, root_gfn, 0, PT64_ROOT_LEVEL, |
| 3004 | 0, ACC_ALL, NULL); |
Avi Kivity | 4db3531 | 2007-11-21 15:28:32 +0200 | [diff] [blame] | 3005 | root = __pa(sp->spt); |
| 3006 | ++sp->root_count; |
Avi Kivity | 8facbbf | 2010-05-04 12:58:32 +0300 | [diff] [blame] | 3007 | spin_unlock(&vcpu->kvm->mmu_lock); |
Zhang Xiantao | ad312c7 | 2007-12-13 23:50:52 +0800 | [diff] [blame] | 3008 | vcpu->arch.mmu.root_hpa = root; |
Marcelo Tosatti | 8986ecc | 2009-05-12 18:55:45 -0300 | [diff] [blame] | 3009 | return 0; |
Avi Kivity | 17ac10a | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 3010 | } |
Joerg Roedel | f87f928 | 2010-09-02 17:29:45 +0200 | [diff] [blame] | 3011 | |
Joerg Roedel | 651dd37 | 2010-09-10 17:30:59 +0200 | [diff] [blame] | 3012 | /* |
| 3013 | * 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] | 3014 | * or a PAE 3-level page table. In either case we need to be aware that |
| 3015 | * 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] | 3016 | */ |
Joerg Roedel | 81407ca | 2010-09-10 17:31:00 +0200 | [diff] [blame] | 3017 | pm_mask = PT_PRESENT_MASK; |
| 3018 | if (vcpu->arch.mmu.shadow_root_level == PT64_ROOT_LEVEL) |
| 3019 | pm_mask |= PT_ACCESSED_MASK | PT_WRITABLE_MASK | PT_USER_MASK; |
| 3020 | |
Avi Kivity | 17ac10a | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 3021 | for (i = 0; i < 4; ++i) { |
Zhang Xiantao | ad312c7 | 2007-12-13 23:50:52 +0800 | [diff] [blame] | 3022 | hpa_t root = vcpu->arch.mmu.pae_root[i]; |
Avi Kivity | 17ac10a | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 3023 | |
| 3024 | ASSERT(!VALID_PAGE(root)); |
Zhang Xiantao | ad312c7 | 2007-12-13 23:50:52 +0800 | [diff] [blame] | 3025 | if (vcpu->arch.mmu.root_level == PT32E_ROOT_LEVEL) { |
Avi Kivity | e4e517b | 2011-07-28 11:36:17 +0300 | [diff] [blame] | 3026 | pdptr = vcpu->arch.mmu.get_pdptr(vcpu, i); |
Avi Kivity | 43a3795 | 2009-06-10 14:12:05 +0300 | [diff] [blame] | 3027 | if (!is_present_gpte(pdptr)) { |
Zhang Xiantao | ad312c7 | 2007-12-13 23:50:52 +0800 | [diff] [blame] | 3028 | vcpu->arch.mmu.pae_root[i] = 0; |
Avi Kivity | 417726a | 2007-04-12 17:35:58 +0300 | [diff] [blame] | 3029 | continue; |
| 3030 | } |
Avi Kivity | 6de4f3a | 2009-05-31 22:58:47 +0300 | [diff] [blame] | 3031 | root_gfn = pdptr >> PAGE_SHIFT; |
Joerg Roedel | f87f928 | 2010-09-02 17:29:45 +0200 | [diff] [blame] | 3032 | if (mmu_check_root(vcpu, root_gfn)) |
| 3033 | return 1; |
Eric Northup | 5a7388c | 2010-04-26 17:00:05 -0700 | [diff] [blame] | 3034 | } |
Avi Kivity | 8facbbf | 2010-05-04 12:58:32 +0300 | [diff] [blame] | 3035 | spin_lock(&vcpu->kvm->mmu_lock); |
Marcelo Tosatti | 24955b6 | 2010-05-12 21:00:35 -0300 | [diff] [blame] | 3036 | kvm_mmu_free_some_pages(vcpu); |
Avi Kivity | 4db3531 | 2007-11-21 15:28:32 +0200 | [diff] [blame] | 3037 | sp = kvm_mmu_get_page(vcpu, root_gfn, i << 30, |
Joerg Roedel | 651dd37 | 2010-09-10 17:30:59 +0200 | [diff] [blame] | 3038 | PT32_ROOT_LEVEL, 0, |
Avi Kivity | f7d9c7b | 2008-02-26 22:12:10 +0200 | [diff] [blame] | 3039 | ACC_ALL, NULL); |
Avi Kivity | 4db3531 | 2007-11-21 15:28:32 +0200 | [diff] [blame] | 3040 | root = __pa(sp->spt); |
| 3041 | ++sp->root_count; |
Avi Kivity | 8facbbf | 2010-05-04 12:58:32 +0300 | [diff] [blame] | 3042 | spin_unlock(&vcpu->kvm->mmu_lock); |
| 3043 | |
Joerg Roedel | 81407ca | 2010-09-10 17:31:00 +0200 | [diff] [blame] | 3044 | vcpu->arch.mmu.pae_root[i] = root | pm_mask; |
Avi Kivity | 17ac10a | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 3045 | } |
Xiao Guangrong | 6292757 | 2010-09-27 18:02:12 +0800 | [diff] [blame] | 3046 | vcpu->arch.mmu.root_hpa = __pa(vcpu->arch.mmu.pae_root); |
Joerg Roedel | 81407ca | 2010-09-10 17:31:00 +0200 | [diff] [blame] | 3047 | |
| 3048 | /* |
| 3049 | * If we shadow a 32 bit page table with a long mode page |
| 3050 | * table we enter this path. |
| 3051 | */ |
| 3052 | if (vcpu->arch.mmu.shadow_root_level == PT64_ROOT_LEVEL) { |
| 3053 | if (vcpu->arch.mmu.lm_root == NULL) { |
| 3054 | /* |
| 3055 | * The additional page necessary for this is only |
| 3056 | * allocated on demand. |
| 3057 | */ |
| 3058 | |
| 3059 | u64 *lm_root; |
| 3060 | |
| 3061 | lm_root = (void*)get_zeroed_page(GFP_KERNEL); |
| 3062 | if (lm_root == NULL) |
| 3063 | return 1; |
| 3064 | |
| 3065 | lm_root[0] = __pa(vcpu->arch.mmu.pae_root) | pm_mask; |
| 3066 | |
| 3067 | vcpu->arch.mmu.lm_root = lm_root; |
| 3068 | } |
| 3069 | |
| 3070 | vcpu->arch.mmu.root_hpa = __pa(vcpu->arch.mmu.lm_root); |
| 3071 | } |
| 3072 | |
Marcelo Tosatti | 8986ecc | 2009-05-12 18:55:45 -0300 | [diff] [blame] | 3073 | return 0; |
Avi Kivity | 17ac10a | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 3074 | } |
| 3075 | |
Joerg Roedel | 651dd37 | 2010-09-10 17:30:59 +0200 | [diff] [blame] | 3076 | static int mmu_alloc_roots(struct kvm_vcpu *vcpu) |
| 3077 | { |
| 3078 | if (vcpu->arch.mmu.direct_map) |
| 3079 | return mmu_alloc_direct_roots(vcpu); |
| 3080 | else |
| 3081 | return mmu_alloc_shadow_roots(vcpu); |
| 3082 | } |
| 3083 | |
Marcelo Tosatti | 0ba73cd | 2008-09-23 13:18:34 -0300 | [diff] [blame] | 3084 | static void mmu_sync_roots(struct kvm_vcpu *vcpu) |
| 3085 | { |
| 3086 | int i; |
| 3087 | struct kvm_mmu_page *sp; |
| 3088 | |
Joerg Roedel | 81407ca | 2010-09-10 17:31:00 +0200 | [diff] [blame] | 3089 | if (vcpu->arch.mmu.direct_map) |
| 3090 | return; |
| 3091 | |
Marcelo Tosatti | 0ba73cd | 2008-09-23 13:18:34 -0300 | [diff] [blame] | 3092 | if (!VALID_PAGE(vcpu->arch.mmu.root_hpa)) |
| 3093 | return; |
Xiao Guangrong | 6903074 | 2010-09-27 18:09:29 +0800 | [diff] [blame] | 3094 | |
Xiao Guangrong | bebb106 | 2011-07-12 03:23:20 +0800 | [diff] [blame] | 3095 | vcpu_clear_mmio_info(vcpu, ~0ul); |
Xiao Guangrong | 0375f7f | 2011-11-28 20:41:00 +0800 | [diff] [blame] | 3096 | kvm_mmu_audit(vcpu, AUDIT_PRE_SYNC); |
Joerg Roedel | 81407ca | 2010-09-10 17:31:00 +0200 | [diff] [blame] | 3097 | if (vcpu->arch.mmu.root_level == PT64_ROOT_LEVEL) { |
Marcelo Tosatti | 0ba73cd | 2008-09-23 13:18:34 -0300 | [diff] [blame] | 3098 | hpa_t root = vcpu->arch.mmu.root_hpa; |
| 3099 | sp = page_header(root); |
| 3100 | mmu_sync_children(vcpu, sp); |
Xiao Guangrong | 0375f7f | 2011-11-28 20:41:00 +0800 | [diff] [blame] | 3101 | kvm_mmu_audit(vcpu, AUDIT_POST_SYNC); |
Marcelo Tosatti | 0ba73cd | 2008-09-23 13:18:34 -0300 | [diff] [blame] | 3102 | return; |
| 3103 | } |
| 3104 | for (i = 0; i < 4; ++i) { |
| 3105 | hpa_t root = vcpu->arch.mmu.pae_root[i]; |
| 3106 | |
Marcelo Tosatti | 8986ecc | 2009-05-12 18:55:45 -0300 | [diff] [blame] | 3107 | if (root && VALID_PAGE(root)) { |
Marcelo Tosatti | 0ba73cd | 2008-09-23 13:18:34 -0300 | [diff] [blame] | 3108 | root &= PT64_BASE_ADDR_MASK; |
| 3109 | sp = page_header(root); |
| 3110 | mmu_sync_children(vcpu, sp); |
| 3111 | } |
| 3112 | } |
Xiao Guangrong | 0375f7f | 2011-11-28 20:41:00 +0800 | [diff] [blame] | 3113 | kvm_mmu_audit(vcpu, AUDIT_POST_SYNC); |
Marcelo Tosatti | 0ba73cd | 2008-09-23 13:18:34 -0300 | [diff] [blame] | 3114 | } |
| 3115 | |
| 3116 | void kvm_mmu_sync_roots(struct kvm_vcpu *vcpu) |
| 3117 | { |
| 3118 | spin_lock(&vcpu->kvm->mmu_lock); |
| 3119 | mmu_sync_roots(vcpu); |
| 3120 | spin_unlock(&vcpu->kvm->mmu_lock); |
| 3121 | } |
| 3122 | |
Gleb Natapov | 1871c60 | 2010-02-10 14:21:32 +0200 | [diff] [blame] | 3123 | 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] | 3124 | u32 access, struct x86_exception *exception) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3125 | { |
Avi Kivity | ab9ae31 | 2010-11-22 17:53:26 +0200 | [diff] [blame] | 3126 | if (exception) |
| 3127 | exception->error_code = 0; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3128 | return vaddr; |
| 3129 | } |
| 3130 | |
Joerg Roedel | 6539e73 | 2010-09-10 17:30:50 +0200 | [diff] [blame] | 3131 | 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] | 3132 | u32 access, |
| 3133 | struct x86_exception *exception) |
Joerg Roedel | 6539e73 | 2010-09-10 17:30:50 +0200 | [diff] [blame] | 3134 | { |
Avi Kivity | ab9ae31 | 2010-11-22 17:53:26 +0200 | [diff] [blame] | 3135 | if (exception) |
| 3136 | exception->error_code = 0; |
Joerg Roedel | 6539e73 | 2010-09-10 17:30:50 +0200 | [diff] [blame] | 3137 | return vcpu->arch.nested_mmu.translate_gpa(vcpu, vaddr, access); |
| 3138 | } |
| 3139 | |
Xiao Guangrong | ce88dec | 2011-07-12 03:33:44 +0800 | [diff] [blame] | 3140 | static bool quickly_check_mmio_pf(struct kvm_vcpu *vcpu, u64 addr, bool direct) |
| 3141 | { |
| 3142 | if (direct) |
| 3143 | return vcpu_match_mmio_gpa(vcpu, addr); |
| 3144 | |
| 3145 | return vcpu_match_mmio_gva(vcpu, addr); |
| 3146 | } |
| 3147 | |
| 3148 | |
| 3149 | /* |
| 3150 | * On direct hosts, the last spte is only allows two states |
| 3151 | * for mmio page fault: |
| 3152 | * - It is the mmio spte |
| 3153 | * - It is zapped or it is being zapped. |
| 3154 | * |
| 3155 | * This function completely checks the spte when the last spte |
| 3156 | * is not the mmio spte. |
| 3157 | */ |
| 3158 | static bool check_direct_spte_mmio_pf(u64 spte) |
| 3159 | { |
| 3160 | return __check_direct_spte_mmio_pf(spte); |
| 3161 | } |
| 3162 | |
| 3163 | static u64 walk_shadow_page_get_mmio_spte(struct kvm_vcpu *vcpu, u64 addr) |
| 3164 | { |
| 3165 | struct kvm_shadow_walk_iterator iterator; |
| 3166 | u64 spte = 0ull; |
| 3167 | |
| 3168 | walk_shadow_page_lockless_begin(vcpu); |
| 3169 | for_each_shadow_entry_lockless(vcpu, addr, iterator, spte) |
| 3170 | if (!is_shadow_present_pte(spte)) |
| 3171 | break; |
| 3172 | walk_shadow_page_lockless_end(vcpu); |
| 3173 | |
| 3174 | return spte; |
| 3175 | } |
| 3176 | |
| 3177 | /* |
| 3178 | * If it is a real mmio page fault, return 1 and emulat the instruction |
| 3179 | * directly, return 0 to let CPU fault again on the address, -1 is |
| 3180 | * returned if bug is detected. |
| 3181 | */ |
| 3182 | int handle_mmio_page_fault_common(struct kvm_vcpu *vcpu, u64 addr, bool direct) |
| 3183 | { |
| 3184 | u64 spte; |
| 3185 | |
| 3186 | if (quickly_check_mmio_pf(vcpu, addr, direct)) |
| 3187 | return 1; |
| 3188 | |
| 3189 | spte = walk_shadow_page_get_mmio_spte(vcpu, addr); |
| 3190 | |
| 3191 | if (is_mmio_spte(spte)) { |
| 3192 | gfn_t gfn = get_mmio_spte_gfn(spte); |
| 3193 | unsigned access = get_mmio_spte_access(spte); |
| 3194 | |
| 3195 | if (direct) |
| 3196 | addr = 0; |
Xiao Guangrong | 4f02264 | 2011-07-12 03:34:24 +0800 | [diff] [blame] | 3197 | |
| 3198 | trace_handle_mmio_page_fault(addr, gfn, access); |
Xiao Guangrong | ce88dec | 2011-07-12 03:33:44 +0800 | [diff] [blame] | 3199 | vcpu_cache_mmio_info(vcpu, addr, gfn, access); |
| 3200 | return 1; |
| 3201 | } |
| 3202 | |
| 3203 | /* |
| 3204 | * It's ok if the gva is remapped by other cpus on shadow guest, |
| 3205 | * it's a BUG if the gfn is not a mmio page. |
| 3206 | */ |
| 3207 | if (direct && !check_direct_spte_mmio_pf(spte)) |
| 3208 | return -1; |
| 3209 | |
| 3210 | /* |
| 3211 | * If the page table is zapped by other cpus, let CPU fault again on |
| 3212 | * the address. |
| 3213 | */ |
| 3214 | return 0; |
| 3215 | } |
| 3216 | EXPORT_SYMBOL_GPL(handle_mmio_page_fault_common); |
| 3217 | |
| 3218 | static int handle_mmio_page_fault(struct kvm_vcpu *vcpu, u64 addr, |
| 3219 | u32 error_code, bool direct) |
| 3220 | { |
| 3221 | int ret; |
| 3222 | |
| 3223 | ret = handle_mmio_page_fault_common(vcpu, addr, direct); |
| 3224 | WARN_ON(ret < 0); |
| 3225 | return ret; |
| 3226 | } |
| 3227 | |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3228 | static int nonpaging_page_fault(struct kvm_vcpu *vcpu, gva_t gva, |
Xiao Guangrong | 78b2c54 | 2010-12-07 10:48:06 +0800 | [diff] [blame] | 3229 | u32 error_code, bool prefault) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3230 | { |
Avi Kivity | e833240 | 2007-12-09 18:43:00 +0200 | [diff] [blame] | 3231 | gfn_t gfn; |
Avi Kivity | e2dec93 | 2007-01-05 16:36:54 -0800 | [diff] [blame] | 3232 | int r; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3233 | |
Harvey Harrison | b8688d5 | 2008-03-03 12:59:56 -0800 | [diff] [blame] | 3234 | pgprintk("%s: gva %lx error %x\n", __func__, gva, error_code); |
Xiao Guangrong | ce88dec | 2011-07-12 03:33:44 +0800 | [diff] [blame] | 3235 | |
| 3236 | if (unlikely(error_code & PFERR_RSVD_MASK)) |
| 3237 | return handle_mmio_page_fault(vcpu, gva, error_code, true); |
| 3238 | |
Avi Kivity | e2dec93 | 2007-01-05 16:36:54 -0800 | [diff] [blame] | 3239 | r = mmu_topup_memory_caches(vcpu); |
| 3240 | if (r) |
| 3241 | return r; |
Avi Kivity | 714b93d | 2007-01-05 16:36:53 -0800 | [diff] [blame] | 3242 | |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3243 | ASSERT(vcpu); |
Zhang Xiantao | ad312c7 | 2007-12-13 23:50:52 +0800 | [diff] [blame] | 3244 | ASSERT(VALID_PAGE(vcpu->arch.mmu.root_hpa)); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3245 | |
Avi Kivity | e833240 | 2007-12-09 18:43:00 +0200 | [diff] [blame] | 3246 | gfn = gva >> PAGE_SHIFT; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3247 | |
Avi Kivity | e833240 | 2007-12-09 18:43:00 +0200 | [diff] [blame] | 3248 | return nonpaging_map(vcpu, gva & PAGE_MASK, |
Xiao Guangrong | c7ba5b4 | 2012-06-20 15:59:18 +0800 | [diff] [blame] | 3249 | error_code, gfn, prefault); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3250 | } |
| 3251 | |
Jan Kiszka | 7e1fbea | 2010-10-20 15:18:02 +0200 | [diff] [blame] | 3252 | 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] | 3253 | { |
| 3254 | struct kvm_arch_async_pf arch; |
Xiao Guangrong | fb67e14 | 2010-12-07 10:35:25 +0800 | [diff] [blame] | 3255 | |
Gleb Natapov | 7c90705 | 2010-10-14 11:22:53 +0200 | [diff] [blame] | 3256 | arch.token = (vcpu->arch.apf.id++ << 12) | vcpu->vcpu_id; |
Gleb Natapov | af585b9 | 2010-10-14 11:22:46 +0200 | [diff] [blame] | 3257 | arch.gfn = gfn; |
Xiao Guangrong | c4806ac | 2010-11-12 14:49:55 +0800 | [diff] [blame] | 3258 | arch.direct_map = vcpu->arch.mmu.direct_map; |
Xiao Guangrong | fb67e14 | 2010-12-07 10:35:25 +0800 | [diff] [blame] | 3259 | arch.cr3 = vcpu->arch.mmu.get_cr3(vcpu); |
Gleb Natapov | af585b9 | 2010-10-14 11:22:46 +0200 | [diff] [blame] | 3260 | |
| 3261 | return kvm_setup_async_pf(vcpu, gva, gfn, &arch); |
| 3262 | } |
| 3263 | |
| 3264 | static bool can_do_async_pf(struct kvm_vcpu *vcpu) |
| 3265 | { |
| 3266 | if (unlikely(!irqchip_in_kernel(vcpu->kvm) || |
| 3267 | kvm_event_needs_reinjection(vcpu))) |
| 3268 | return false; |
| 3269 | |
| 3270 | return kvm_x86_ops->interrupt_allowed(vcpu); |
| 3271 | } |
| 3272 | |
Xiao Guangrong | 78b2c54 | 2010-12-07 10:48:06 +0800 | [diff] [blame] | 3273 | 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] | 3274 | gva_t gva, pfn_t *pfn, bool write, bool *writable) |
Gleb Natapov | af585b9 | 2010-10-14 11:22:46 +0200 | [diff] [blame] | 3275 | { |
| 3276 | bool async; |
| 3277 | |
Marcelo Tosatti | 612819c | 2010-10-22 14:18:18 -0200 | [diff] [blame] | 3278 | *pfn = gfn_to_pfn_async(vcpu->kvm, gfn, &async, write, writable); |
Gleb Natapov | af585b9 | 2010-10-14 11:22:46 +0200 | [diff] [blame] | 3279 | |
| 3280 | if (!async) |
| 3281 | return false; /* *pfn has correct page already */ |
| 3282 | |
Xiao Guangrong | 78b2c54 | 2010-12-07 10:48:06 +0800 | [diff] [blame] | 3283 | if (!prefault && can_do_async_pf(vcpu)) { |
Xiao Guangrong | c9b263d | 2010-11-01 16:58:43 +0800 | [diff] [blame] | 3284 | trace_kvm_try_async_get_page(gva, gfn); |
Gleb Natapov | af585b9 | 2010-10-14 11:22:46 +0200 | [diff] [blame] | 3285 | if (kvm_find_async_pf_gfn(vcpu, gfn)) { |
| 3286 | trace_kvm_async_pf_doublefault(gva, gfn); |
| 3287 | kvm_make_request(KVM_REQ_APF_HALT, vcpu); |
| 3288 | return true; |
| 3289 | } else if (kvm_arch_setup_async_pf(vcpu, gva, gfn)) |
| 3290 | return true; |
| 3291 | } |
| 3292 | |
Marcelo Tosatti | 612819c | 2010-10-22 14:18:18 -0200 | [diff] [blame] | 3293 | *pfn = gfn_to_pfn_prot(vcpu->kvm, gfn, write, writable); |
Gleb Natapov | af585b9 | 2010-10-14 11:22:46 +0200 | [diff] [blame] | 3294 | |
| 3295 | return false; |
| 3296 | } |
| 3297 | |
Gleb Natapov | 56028d0 | 2010-10-17 18:13:42 +0200 | [diff] [blame] | 3298 | 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] | 3299 | bool prefault) |
Joerg Roedel | fb72d16 | 2008-02-07 13:47:44 +0100 | [diff] [blame] | 3300 | { |
Anthony Liguori | 35149e2 | 2008-04-02 14:46:56 -0500 | [diff] [blame] | 3301 | pfn_t pfn; |
Joerg Roedel | fb72d16 | 2008-02-07 13:47:44 +0100 | [diff] [blame] | 3302 | int r; |
Joerg Roedel | 852e3c1 | 2009-07-27 16:30:44 +0200 | [diff] [blame] | 3303 | int level; |
Andrea Arcangeli | 936a5fe | 2011-01-13 15:46:48 -0800 | [diff] [blame] | 3304 | int force_pt_level; |
Marcelo Tosatti | 05da455 | 2008-02-23 11:44:30 -0300 | [diff] [blame] | 3305 | gfn_t gfn = gpa >> PAGE_SHIFT; |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 3306 | unsigned long mmu_seq; |
Marcelo Tosatti | 612819c | 2010-10-22 14:18:18 -0200 | [diff] [blame] | 3307 | int write = error_code & PFERR_WRITE_MASK; |
| 3308 | bool map_writable; |
Joerg Roedel | fb72d16 | 2008-02-07 13:47:44 +0100 | [diff] [blame] | 3309 | |
| 3310 | ASSERT(vcpu); |
| 3311 | ASSERT(VALID_PAGE(vcpu->arch.mmu.root_hpa)); |
| 3312 | |
Xiao Guangrong | ce88dec | 2011-07-12 03:33:44 +0800 | [diff] [blame] | 3313 | if (unlikely(error_code & PFERR_RSVD_MASK)) |
| 3314 | return handle_mmio_page_fault(vcpu, gpa, error_code, true); |
| 3315 | |
Joerg Roedel | fb72d16 | 2008-02-07 13:47:44 +0100 | [diff] [blame] | 3316 | r = mmu_topup_memory_caches(vcpu); |
| 3317 | if (r) |
| 3318 | return r; |
| 3319 | |
Andrea Arcangeli | 936a5fe | 2011-01-13 15:46:48 -0800 | [diff] [blame] | 3320 | force_pt_level = mapping_level_dirty_bitmap(vcpu, gfn); |
| 3321 | if (likely(!force_pt_level)) { |
| 3322 | level = mapping_level(vcpu, gfn); |
| 3323 | gfn &= ~(KVM_PAGES_PER_HPAGE(level) - 1); |
| 3324 | } else |
| 3325 | level = PT_PAGE_TABLE_LEVEL; |
Joerg Roedel | 852e3c1 | 2009-07-27 16:30:44 +0200 | [diff] [blame] | 3326 | |
Xiao Guangrong | c7ba5b4 | 2012-06-20 15:59:18 +0800 | [diff] [blame] | 3327 | if (fast_page_fault(vcpu, gpa, level, error_code)) |
| 3328 | return 0; |
| 3329 | |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 3330 | mmu_seq = vcpu->kvm->mmu_notifier_seq; |
Marcelo Tosatti | 4c2155c | 2008-09-16 20:54:47 -0300 | [diff] [blame] | 3331 | smp_rmb(); |
Gleb Natapov | af585b9 | 2010-10-14 11:22:46 +0200 | [diff] [blame] | 3332 | |
Xiao Guangrong | 78b2c54 | 2010-12-07 10:48:06 +0800 | [diff] [blame] | 3333 | if (try_async_pf(vcpu, prefault, gfn, gpa, &pfn, write, &map_writable)) |
Gleb Natapov | af585b9 | 2010-10-14 11:22:46 +0200 | [diff] [blame] | 3334 | return 0; |
| 3335 | |
Xiao Guangrong | d7c5520 | 2011-07-12 03:29:38 +0800 | [diff] [blame] | 3336 | if (handle_abnormal_pfn(vcpu, 0, gfn, pfn, ACC_ALL, &r)) |
| 3337 | return r; |
| 3338 | |
Joerg Roedel | fb72d16 | 2008-02-07 13:47:44 +0100 | [diff] [blame] | 3339 | spin_lock(&vcpu->kvm->mmu_lock); |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 3340 | if (mmu_notifier_retry(vcpu, mmu_seq)) |
| 3341 | goto out_unlock; |
Joerg Roedel | fb72d16 | 2008-02-07 13:47:44 +0100 | [diff] [blame] | 3342 | kvm_mmu_free_some_pages(vcpu); |
Andrea Arcangeli | 936a5fe | 2011-01-13 15:46:48 -0800 | [diff] [blame] | 3343 | if (likely(!force_pt_level)) |
| 3344 | transparent_hugepage_adjust(vcpu, &gfn, &pfn, &level); |
Marcelo Tosatti | 612819c | 2010-10-22 14:18:18 -0200 | [diff] [blame] | 3345 | r = __direct_map(vcpu, gpa, write, map_writable, |
Xiao Guangrong | 2ec4739 | 2010-12-07 10:34:42 +0800 | [diff] [blame] | 3346 | level, gfn, pfn, prefault); |
Joerg Roedel | fb72d16 | 2008-02-07 13:47:44 +0100 | [diff] [blame] | 3347 | spin_unlock(&vcpu->kvm->mmu_lock); |
Joerg Roedel | fb72d16 | 2008-02-07 13:47:44 +0100 | [diff] [blame] | 3348 | |
| 3349 | return r; |
Andrea Arcangeli | e930bff | 2008-07-25 16:24:52 +0200 | [diff] [blame] | 3350 | |
| 3351 | out_unlock: |
| 3352 | spin_unlock(&vcpu->kvm->mmu_lock); |
| 3353 | kvm_release_pfn_clean(pfn); |
| 3354 | return 0; |
Joerg Roedel | fb72d16 | 2008-02-07 13:47:44 +0100 | [diff] [blame] | 3355 | } |
| 3356 | |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3357 | static void nonpaging_free(struct kvm_vcpu *vcpu) |
| 3358 | { |
Avi Kivity | 17ac10a | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 3359 | mmu_free_roots(vcpu); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3360 | } |
| 3361 | |
Joerg Roedel | 52fde8d | 2010-09-10 17:30:44 +0200 | [diff] [blame] | 3362 | static int nonpaging_init_context(struct kvm_vcpu *vcpu, |
| 3363 | struct kvm_mmu *context) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3364 | { |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3365 | context->new_cr3 = nonpaging_new_cr3; |
| 3366 | context->page_fault = nonpaging_page_fault; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3367 | context->gva_to_gpa = nonpaging_gva_to_gpa; |
| 3368 | context->free = nonpaging_free; |
Marcelo Tosatti | e8bc217 | 2008-09-23 13:18:33 -0300 | [diff] [blame] | 3369 | context->sync_page = nonpaging_sync_page; |
Marcelo Tosatti | a705289 | 2008-09-23 13:18:35 -0300 | [diff] [blame] | 3370 | context->invlpg = nonpaging_invlpg; |
Xiao Guangrong | 0f53b5b | 2011-03-09 15:43:51 +0800 | [diff] [blame] | 3371 | context->update_pte = nonpaging_update_pte; |
Avi Kivity | cea0f0e | 2007-01-05 16:36:43 -0800 | [diff] [blame] | 3372 | context->root_level = 0; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3373 | context->shadow_root_level = PT32E_ROOT_LEVEL; |
Avi Kivity | 17c3ba9 | 2007-06-04 15:58:30 +0300 | [diff] [blame] | 3374 | context->root_hpa = INVALID_PAGE; |
Joerg Roedel | c5a78f2b | 2010-09-10 17:30:39 +0200 | [diff] [blame] | 3375 | context->direct_map = true; |
Joerg Roedel | 2d48a98 | 2010-09-10 17:31:01 +0200 | [diff] [blame] | 3376 | context->nx = false; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3377 | return 0; |
| 3378 | } |
| 3379 | |
Avi Kivity | d835dfe | 2007-11-21 02:57:59 +0200 | [diff] [blame] | 3380 | void kvm_mmu_flush_tlb(struct kvm_vcpu *vcpu) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3381 | { |
Avi Kivity | 1165f5f | 2007-04-19 17:27:43 +0300 | [diff] [blame] | 3382 | ++vcpu->stat.tlb_flush; |
Avi Kivity | a8eeb04 | 2010-05-10 12:34:53 +0300 | [diff] [blame] | 3383 | kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3384 | } |
| 3385 | |
| 3386 | static void paging_new_cr3(struct kvm_vcpu *vcpu) |
| 3387 | { |
Avi Kivity | 9f8fe50 | 2010-12-05 17:30:00 +0200 | [diff] [blame] | 3388 | pgprintk("%s: cr3 %lx\n", __func__, kvm_read_cr3(vcpu)); |
Avi Kivity | cea0f0e | 2007-01-05 16:36:43 -0800 | [diff] [blame] | 3389 | mmu_free_roots(vcpu); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3390 | } |
| 3391 | |
Joerg Roedel | 5777ed3 | 2010-09-10 17:30:42 +0200 | [diff] [blame] | 3392 | static unsigned long get_cr3(struct kvm_vcpu *vcpu) |
| 3393 | { |
Avi Kivity | 9f8fe50 | 2010-12-05 17:30:00 +0200 | [diff] [blame] | 3394 | return kvm_read_cr3(vcpu); |
Joerg Roedel | 5777ed3 | 2010-09-10 17:30:42 +0200 | [diff] [blame] | 3395 | } |
| 3396 | |
Avi Kivity | 6389ee9 | 2010-11-29 16:12:30 +0200 | [diff] [blame] | 3397 | static void inject_page_fault(struct kvm_vcpu *vcpu, |
| 3398 | struct x86_exception *fault) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3399 | { |
Avi Kivity | 6389ee9 | 2010-11-29 16:12:30 +0200 | [diff] [blame] | 3400 | vcpu->arch.mmu.inject_page_fault(vcpu, fault); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3401 | } |
| 3402 | |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3403 | static void paging_free(struct kvm_vcpu *vcpu) |
| 3404 | { |
| 3405 | nonpaging_free(vcpu); |
| 3406 | } |
| 3407 | |
Joerg Roedel | 3241f22 | 2010-09-10 17:30:45 +0200 | [diff] [blame] | 3408 | static bool is_rsvd_bits_set(struct kvm_mmu *mmu, u64 gpte, int level) |
Dong, Eddie | 82725b2 | 2009-03-30 16:21:08 +0800 | [diff] [blame] | 3409 | { |
| 3410 | int bit7; |
| 3411 | |
| 3412 | bit7 = (gpte >> 7) & 1; |
Joerg Roedel | 3241f22 | 2010-09-10 17:30:45 +0200 | [diff] [blame] | 3413 | return (gpte & mmu->rsvd_bits_mask[bit7][level-1]) != 0; |
Dong, Eddie | 82725b2 | 2009-03-30 16:21:08 +0800 | [diff] [blame] | 3414 | } |
| 3415 | |
Xiao Guangrong | ce88dec | 2011-07-12 03:33:44 +0800 | [diff] [blame] | 3416 | static bool sync_mmio_spte(u64 *sptep, gfn_t gfn, unsigned access, |
| 3417 | int *nr_present) |
| 3418 | { |
| 3419 | if (unlikely(is_mmio_spte(*sptep))) { |
| 3420 | if (gfn != get_mmio_spte_gfn(*sptep)) { |
| 3421 | mmu_spte_clear_no_track(sptep); |
| 3422 | return true; |
| 3423 | } |
| 3424 | |
| 3425 | (*nr_present)++; |
| 3426 | mark_mmio_spte(sptep, gfn, access); |
| 3427 | return true; |
| 3428 | } |
| 3429 | |
| 3430 | return false; |
| 3431 | } |
| 3432 | |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3433 | #define PTTYPE 64 |
| 3434 | #include "paging_tmpl.h" |
| 3435 | #undef PTTYPE |
| 3436 | |
| 3437 | #define PTTYPE 32 |
| 3438 | #include "paging_tmpl.h" |
| 3439 | #undef PTTYPE |
| 3440 | |
Joerg Roedel | 52fde8d | 2010-09-10 17:30:44 +0200 | [diff] [blame] | 3441 | static void reset_rsvds_bits_mask(struct kvm_vcpu *vcpu, |
Davidlohr Bueso | 4d6931c | 2012-03-05 16:53:06 +0100 | [diff] [blame] | 3442 | struct kvm_mmu *context) |
Dong, Eddie | 82725b2 | 2009-03-30 16:21:08 +0800 | [diff] [blame] | 3443 | { |
Dong, Eddie | 82725b2 | 2009-03-30 16:21:08 +0800 | [diff] [blame] | 3444 | int maxphyaddr = cpuid_maxphyaddr(vcpu); |
| 3445 | u64 exb_bit_rsvd = 0; |
| 3446 | |
Joerg Roedel | 2d48a98 | 2010-09-10 17:31:01 +0200 | [diff] [blame] | 3447 | if (!context->nx) |
Dong, Eddie | 82725b2 | 2009-03-30 16:21:08 +0800 | [diff] [blame] | 3448 | exb_bit_rsvd = rsvd_bits(63, 63); |
Davidlohr Bueso | 4d6931c | 2012-03-05 16:53:06 +0100 | [diff] [blame] | 3449 | switch (context->root_level) { |
Dong, Eddie | 82725b2 | 2009-03-30 16:21:08 +0800 | [diff] [blame] | 3450 | case PT32_ROOT_LEVEL: |
| 3451 | /* no rsvd bits for 2 level 4K page table entries */ |
| 3452 | context->rsvd_bits_mask[0][1] = 0; |
| 3453 | context->rsvd_bits_mask[0][0] = 0; |
Xiao Guangrong | f815bce | 2010-03-19 17:58:53 +0800 | [diff] [blame] | 3454 | context->rsvd_bits_mask[1][0] = context->rsvd_bits_mask[0][0]; |
| 3455 | |
| 3456 | if (!is_pse(vcpu)) { |
| 3457 | context->rsvd_bits_mask[1][1] = 0; |
| 3458 | break; |
| 3459 | } |
| 3460 | |
Dong, Eddie | 82725b2 | 2009-03-30 16:21:08 +0800 | [diff] [blame] | 3461 | if (is_cpuid_PSE36()) |
| 3462 | /* 36bits PSE 4MB page */ |
| 3463 | context->rsvd_bits_mask[1][1] = rsvd_bits(17, 21); |
| 3464 | else |
| 3465 | /* 32 bits PSE 4MB page */ |
| 3466 | context->rsvd_bits_mask[1][1] = rsvd_bits(13, 21); |
Dong, Eddie | 82725b2 | 2009-03-30 16:21:08 +0800 | [diff] [blame] | 3467 | break; |
| 3468 | case PT32E_ROOT_LEVEL: |
Dong, Eddie | 20c466b | 2009-03-31 23:03:45 +0800 | [diff] [blame] | 3469 | context->rsvd_bits_mask[0][2] = |
| 3470 | rsvd_bits(maxphyaddr, 63) | |
| 3471 | rsvd_bits(7, 8) | rsvd_bits(1, 2); /* PDPTE */ |
Dong, Eddie | 82725b2 | 2009-03-30 16:21:08 +0800 | [diff] [blame] | 3472 | context->rsvd_bits_mask[0][1] = exb_bit_rsvd | |
Sheng Yang | 4c26b4c | 2009-04-02 10:28:37 +0800 | [diff] [blame] | 3473 | rsvd_bits(maxphyaddr, 62); /* PDE */ |
Dong, Eddie | 82725b2 | 2009-03-30 16:21:08 +0800 | [diff] [blame] | 3474 | context->rsvd_bits_mask[0][0] = exb_bit_rsvd | |
| 3475 | rsvd_bits(maxphyaddr, 62); /* PTE */ |
| 3476 | context->rsvd_bits_mask[1][1] = exb_bit_rsvd | |
| 3477 | rsvd_bits(maxphyaddr, 62) | |
| 3478 | rsvd_bits(13, 20); /* large page */ |
Xiao Guangrong | f815bce | 2010-03-19 17:58:53 +0800 | [diff] [blame] | 3479 | context->rsvd_bits_mask[1][0] = context->rsvd_bits_mask[0][0]; |
Dong, Eddie | 82725b2 | 2009-03-30 16:21:08 +0800 | [diff] [blame] | 3480 | break; |
| 3481 | case PT64_ROOT_LEVEL: |
| 3482 | context->rsvd_bits_mask[0][3] = exb_bit_rsvd | |
| 3483 | rsvd_bits(maxphyaddr, 51) | rsvd_bits(7, 8); |
| 3484 | context->rsvd_bits_mask[0][2] = exb_bit_rsvd | |
| 3485 | rsvd_bits(maxphyaddr, 51) | rsvd_bits(7, 8); |
| 3486 | context->rsvd_bits_mask[0][1] = exb_bit_rsvd | |
Sheng Yang | 4c26b4c | 2009-04-02 10:28:37 +0800 | [diff] [blame] | 3487 | rsvd_bits(maxphyaddr, 51); |
Dong, Eddie | 82725b2 | 2009-03-30 16:21:08 +0800 | [diff] [blame] | 3488 | context->rsvd_bits_mask[0][0] = exb_bit_rsvd | |
| 3489 | rsvd_bits(maxphyaddr, 51); |
| 3490 | context->rsvd_bits_mask[1][3] = context->rsvd_bits_mask[0][3]; |
Joerg Roedel | e04da98 | 2009-07-27 16:30:45 +0200 | [diff] [blame] | 3491 | context->rsvd_bits_mask[1][2] = exb_bit_rsvd | |
| 3492 | rsvd_bits(maxphyaddr, 51) | |
| 3493 | rsvd_bits(13, 29); |
Dong, Eddie | 82725b2 | 2009-03-30 16:21:08 +0800 | [diff] [blame] | 3494 | context->rsvd_bits_mask[1][1] = exb_bit_rsvd | |
Sheng Yang | 4c26b4c | 2009-04-02 10:28:37 +0800 | [diff] [blame] | 3495 | rsvd_bits(maxphyaddr, 51) | |
| 3496 | rsvd_bits(13, 20); /* large page */ |
Xiao Guangrong | f815bce | 2010-03-19 17:58:53 +0800 | [diff] [blame] | 3497 | context->rsvd_bits_mask[1][0] = context->rsvd_bits_mask[0][0]; |
Dong, Eddie | 82725b2 | 2009-03-30 16:21:08 +0800 | [diff] [blame] | 3498 | break; |
| 3499 | } |
| 3500 | } |
| 3501 | |
Joerg Roedel | 52fde8d | 2010-09-10 17:30:44 +0200 | [diff] [blame] | 3502 | static int paging64_init_context_common(struct kvm_vcpu *vcpu, |
| 3503 | struct kvm_mmu *context, |
| 3504 | int level) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3505 | { |
Joerg Roedel | 2d48a98 | 2010-09-10 17:31:01 +0200 | [diff] [blame] | 3506 | context->nx = is_nx(vcpu); |
Davidlohr Bueso | 4d6931c | 2012-03-05 16:53:06 +0100 | [diff] [blame] | 3507 | context->root_level = level; |
Joerg Roedel | 2d48a98 | 2010-09-10 17:31:01 +0200 | [diff] [blame] | 3508 | |
Davidlohr Bueso | 4d6931c | 2012-03-05 16:53:06 +0100 | [diff] [blame] | 3509 | reset_rsvds_bits_mask(vcpu, context); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3510 | |
| 3511 | ASSERT(is_pae(vcpu)); |
| 3512 | context->new_cr3 = paging_new_cr3; |
| 3513 | context->page_fault = paging64_page_fault; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3514 | context->gva_to_gpa = paging64_gva_to_gpa; |
Marcelo Tosatti | e8bc217 | 2008-09-23 13:18:33 -0300 | [diff] [blame] | 3515 | context->sync_page = paging64_sync_page; |
Marcelo Tosatti | a705289 | 2008-09-23 13:18:35 -0300 | [diff] [blame] | 3516 | context->invlpg = paging64_invlpg; |
Xiao Guangrong | 0f53b5b | 2011-03-09 15:43:51 +0800 | [diff] [blame] | 3517 | context->update_pte = paging64_update_pte; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3518 | context->free = paging_free; |
Avi Kivity | 17ac10a | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 3519 | context->shadow_root_level = level; |
Avi Kivity | 17c3ba9 | 2007-06-04 15:58:30 +0300 | [diff] [blame] | 3520 | context->root_hpa = INVALID_PAGE; |
Joerg Roedel | c5a78f2b | 2010-09-10 17:30:39 +0200 | [diff] [blame] | 3521 | context->direct_map = false; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3522 | return 0; |
| 3523 | } |
| 3524 | |
Joerg Roedel | 52fde8d | 2010-09-10 17:30:44 +0200 | [diff] [blame] | 3525 | static int paging64_init_context(struct kvm_vcpu *vcpu, |
| 3526 | struct kvm_mmu *context) |
Avi Kivity | 17ac10a | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 3527 | { |
Joerg Roedel | 52fde8d | 2010-09-10 17:30:44 +0200 | [diff] [blame] | 3528 | return paging64_init_context_common(vcpu, context, PT64_ROOT_LEVEL); |
Avi Kivity | 17ac10a | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 3529 | } |
| 3530 | |
Joerg Roedel | 52fde8d | 2010-09-10 17:30:44 +0200 | [diff] [blame] | 3531 | static int paging32_init_context(struct kvm_vcpu *vcpu, |
| 3532 | struct kvm_mmu *context) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3533 | { |
Joerg Roedel | 2d48a98 | 2010-09-10 17:31:01 +0200 | [diff] [blame] | 3534 | context->nx = false; |
Davidlohr Bueso | 4d6931c | 2012-03-05 16:53:06 +0100 | [diff] [blame] | 3535 | context->root_level = PT32_ROOT_LEVEL; |
Joerg Roedel | 2d48a98 | 2010-09-10 17:31:01 +0200 | [diff] [blame] | 3536 | |
Davidlohr Bueso | 4d6931c | 2012-03-05 16:53:06 +0100 | [diff] [blame] | 3537 | reset_rsvds_bits_mask(vcpu, context); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3538 | |
| 3539 | context->new_cr3 = paging_new_cr3; |
| 3540 | context->page_fault = paging32_page_fault; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3541 | context->gva_to_gpa = paging32_gva_to_gpa; |
| 3542 | context->free = paging_free; |
Marcelo Tosatti | e8bc217 | 2008-09-23 13:18:33 -0300 | [diff] [blame] | 3543 | context->sync_page = paging32_sync_page; |
Marcelo Tosatti | a705289 | 2008-09-23 13:18:35 -0300 | [diff] [blame] | 3544 | context->invlpg = paging32_invlpg; |
Xiao Guangrong | 0f53b5b | 2011-03-09 15:43:51 +0800 | [diff] [blame] | 3545 | context->update_pte = paging32_update_pte; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3546 | context->shadow_root_level = PT32E_ROOT_LEVEL; |
Avi Kivity | 17c3ba9 | 2007-06-04 15:58:30 +0300 | [diff] [blame] | 3547 | context->root_hpa = INVALID_PAGE; |
Joerg Roedel | c5a78f2b | 2010-09-10 17:30:39 +0200 | [diff] [blame] | 3548 | context->direct_map = false; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3549 | return 0; |
| 3550 | } |
| 3551 | |
Joerg Roedel | 52fde8d | 2010-09-10 17:30:44 +0200 | [diff] [blame] | 3552 | static int paging32E_init_context(struct kvm_vcpu *vcpu, |
| 3553 | struct kvm_mmu *context) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3554 | { |
Joerg Roedel | 52fde8d | 2010-09-10 17:30:44 +0200 | [diff] [blame] | 3555 | return paging64_init_context_common(vcpu, context, PT32E_ROOT_LEVEL); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3556 | } |
| 3557 | |
Joerg Roedel | fb72d16 | 2008-02-07 13:47:44 +0100 | [diff] [blame] | 3558 | static int init_kvm_tdp_mmu(struct kvm_vcpu *vcpu) |
| 3559 | { |
Joerg Roedel | 14dfe85 | 2010-09-10 17:30:49 +0200 | [diff] [blame] | 3560 | struct kvm_mmu *context = vcpu->arch.walk_mmu; |
Joerg Roedel | fb72d16 | 2008-02-07 13:47:44 +0100 | [diff] [blame] | 3561 | |
Avi Kivity | c445f8e | 2010-12-21 16:26:01 +0200 | [diff] [blame] | 3562 | context->base_role.word = 0; |
Joerg Roedel | fb72d16 | 2008-02-07 13:47:44 +0100 | [diff] [blame] | 3563 | context->new_cr3 = nonpaging_new_cr3; |
| 3564 | context->page_fault = tdp_page_fault; |
| 3565 | context->free = nonpaging_free; |
Marcelo Tosatti | e8bc217 | 2008-09-23 13:18:33 -0300 | [diff] [blame] | 3566 | context->sync_page = nonpaging_sync_page; |
Marcelo Tosatti | a705289 | 2008-09-23 13:18:35 -0300 | [diff] [blame] | 3567 | context->invlpg = nonpaging_invlpg; |
Xiao Guangrong | 0f53b5b | 2011-03-09 15:43:51 +0800 | [diff] [blame] | 3568 | context->update_pte = nonpaging_update_pte; |
Sheng Yang | 67253af | 2008-04-25 10:20:22 +0800 | [diff] [blame] | 3569 | context->shadow_root_level = kvm_x86_ops->get_tdp_level(); |
Joerg Roedel | fb72d16 | 2008-02-07 13:47:44 +0100 | [diff] [blame] | 3570 | context->root_hpa = INVALID_PAGE; |
Joerg Roedel | c5a78f2b | 2010-09-10 17:30:39 +0200 | [diff] [blame] | 3571 | context->direct_map = true; |
Joerg Roedel | 1c97f0a | 2010-09-10 17:30:41 +0200 | [diff] [blame] | 3572 | context->set_cr3 = kvm_x86_ops->set_tdp_cr3; |
Joerg Roedel | 5777ed3 | 2010-09-10 17:30:42 +0200 | [diff] [blame] | 3573 | context->get_cr3 = get_cr3; |
Avi Kivity | e4e517b | 2011-07-28 11:36:17 +0300 | [diff] [blame] | 3574 | context->get_pdptr = kvm_pdptr_read; |
Joerg Roedel | cb659db | 2010-09-10 17:30:43 +0200 | [diff] [blame] | 3575 | context->inject_page_fault = kvm_inject_page_fault; |
Joerg Roedel | fb72d16 | 2008-02-07 13:47:44 +0100 | [diff] [blame] | 3576 | |
| 3577 | if (!is_paging(vcpu)) { |
Joerg Roedel | 2d48a98 | 2010-09-10 17:31:01 +0200 | [diff] [blame] | 3578 | context->nx = false; |
Joerg Roedel | fb72d16 | 2008-02-07 13:47:44 +0100 | [diff] [blame] | 3579 | context->gva_to_gpa = nonpaging_gva_to_gpa; |
| 3580 | context->root_level = 0; |
| 3581 | } else if (is_long_mode(vcpu)) { |
Joerg Roedel | 2d48a98 | 2010-09-10 17:31:01 +0200 | [diff] [blame] | 3582 | context->nx = is_nx(vcpu); |
Joerg Roedel | fb72d16 | 2008-02-07 13:47:44 +0100 | [diff] [blame] | 3583 | context->root_level = PT64_ROOT_LEVEL; |
Davidlohr Bueso | 4d6931c | 2012-03-05 16:53:06 +0100 | [diff] [blame] | 3584 | reset_rsvds_bits_mask(vcpu, context); |
| 3585 | context->gva_to_gpa = paging64_gva_to_gpa; |
Joerg Roedel | fb72d16 | 2008-02-07 13:47:44 +0100 | [diff] [blame] | 3586 | } else if (is_pae(vcpu)) { |
Joerg Roedel | 2d48a98 | 2010-09-10 17:31:01 +0200 | [diff] [blame] | 3587 | context->nx = is_nx(vcpu); |
Joerg Roedel | fb72d16 | 2008-02-07 13:47:44 +0100 | [diff] [blame] | 3588 | context->root_level = PT32E_ROOT_LEVEL; |
Davidlohr Bueso | 4d6931c | 2012-03-05 16:53:06 +0100 | [diff] [blame] | 3589 | reset_rsvds_bits_mask(vcpu, context); |
| 3590 | context->gva_to_gpa = paging64_gva_to_gpa; |
Joerg Roedel | fb72d16 | 2008-02-07 13:47:44 +0100 | [diff] [blame] | 3591 | } else { |
Joerg Roedel | 2d48a98 | 2010-09-10 17:31:01 +0200 | [diff] [blame] | 3592 | context->nx = false; |
Joerg Roedel | fb72d16 | 2008-02-07 13:47:44 +0100 | [diff] [blame] | 3593 | context->root_level = PT32_ROOT_LEVEL; |
Davidlohr Bueso | 4d6931c | 2012-03-05 16:53:06 +0100 | [diff] [blame] | 3594 | reset_rsvds_bits_mask(vcpu, context); |
| 3595 | context->gva_to_gpa = paging32_gva_to_gpa; |
Joerg Roedel | fb72d16 | 2008-02-07 13:47:44 +0100 | [diff] [blame] | 3596 | } |
| 3597 | |
| 3598 | return 0; |
| 3599 | } |
| 3600 | |
Joerg Roedel | 52fde8d | 2010-09-10 17:30:44 +0200 | [diff] [blame] | 3601 | 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] | 3602 | { |
Avi Kivity | a770f6f | 2008-12-21 19:20:09 +0200 | [diff] [blame] | 3603 | int r; |
Avi Kivity | 411c588 | 2011-06-06 16:11:54 +0300 | [diff] [blame] | 3604 | bool smep = kvm_read_cr4_bits(vcpu, X86_CR4_SMEP); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3605 | ASSERT(vcpu); |
Zhang Xiantao | ad312c7 | 2007-12-13 23:50:52 +0800 | [diff] [blame] | 3606 | ASSERT(!VALID_PAGE(vcpu->arch.mmu.root_hpa)); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3607 | |
| 3608 | if (!is_paging(vcpu)) |
Joerg Roedel | 52fde8d | 2010-09-10 17:30:44 +0200 | [diff] [blame] | 3609 | r = nonpaging_init_context(vcpu, context); |
Avi Kivity | a9058ec | 2006-12-29 16:49:37 -0800 | [diff] [blame] | 3610 | else if (is_long_mode(vcpu)) |
Joerg Roedel | 52fde8d | 2010-09-10 17:30:44 +0200 | [diff] [blame] | 3611 | r = paging64_init_context(vcpu, context); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3612 | else if (is_pae(vcpu)) |
Joerg Roedel | 52fde8d | 2010-09-10 17:30:44 +0200 | [diff] [blame] | 3613 | r = paging32E_init_context(vcpu, context); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3614 | else |
Joerg Roedel | 52fde8d | 2010-09-10 17:30:44 +0200 | [diff] [blame] | 3615 | r = paging32_init_context(vcpu, context); |
Avi Kivity | a770f6f | 2008-12-21 19:20:09 +0200 | [diff] [blame] | 3616 | |
Avi Kivity | 5b7e010 | 2010-04-14 19:20:03 +0300 | [diff] [blame] | 3617 | vcpu->arch.mmu.base_role.cr4_pae = !!is_pae(vcpu); |
Joerg Roedel | f43addd | 2010-09-10 17:30:40 +0200 | [diff] [blame] | 3618 | vcpu->arch.mmu.base_role.cr0_wp = is_write_protection(vcpu); |
Avi Kivity | 411c588 | 2011-06-06 16:11:54 +0300 | [diff] [blame] | 3619 | vcpu->arch.mmu.base_role.smep_andnot_wp |
| 3620 | = smep && !is_write_protection(vcpu); |
Joerg Roedel | 52fde8d | 2010-09-10 17:30:44 +0200 | [diff] [blame] | 3621 | |
| 3622 | return r; |
| 3623 | } |
| 3624 | EXPORT_SYMBOL_GPL(kvm_init_shadow_mmu); |
| 3625 | |
| 3626 | static int init_kvm_softmmu(struct kvm_vcpu *vcpu) |
| 3627 | { |
Joerg Roedel | 14dfe85 | 2010-09-10 17:30:49 +0200 | [diff] [blame] | 3628 | int r = kvm_init_shadow_mmu(vcpu, vcpu->arch.walk_mmu); |
Joerg Roedel | 52fde8d | 2010-09-10 17:30:44 +0200 | [diff] [blame] | 3629 | |
Joerg Roedel | 14dfe85 | 2010-09-10 17:30:49 +0200 | [diff] [blame] | 3630 | vcpu->arch.walk_mmu->set_cr3 = kvm_x86_ops->set_cr3; |
| 3631 | vcpu->arch.walk_mmu->get_cr3 = get_cr3; |
Avi Kivity | e4e517b | 2011-07-28 11:36:17 +0300 | [diff] [blame] | 3632 | vcpu->arch.walk_mmu->get_pdptr = kvm_pdptr_read; |
Joerg Roedel | 14dfe85 | 2010-09-10 17:30:49 +0200 | [diff] [blame] | 3633 | vcpu->arch.walk_mmu->inject_page_fault = kvm_inject_page_fault; |
Avi Kivity | a770f6f | 2008-12-21 19:20:09 +0200 | [diff] [blame] | 3634 | |
| 3635 | return r; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3636 | } |
| 3637 | |
Joerg Roedel | 02f59dc | 2010-09-10 17:30:54 +0200 | [diff] [blame] | 3638 | static int init_kvm_nested_mmu(struct kvm_vcpu *vcpu) |
| 3639 | { |
| 3640 | struct kvm_mmu *g_context = &vcpu->arch.nested_mmu; |
| 3641 | |
| 3642 | g_context->get_cr3 = get_cr3; |
Avi Kivity | e4e517b | 2011-07-28 11:36:17 +0300 | [diff] [blame] | 3643 | g_context->get_pdptr = kvm_pdptr_read; |
Joerg Roedel | 02f59dc | 2010-09-10 17:30:54 +0200 | [diff] [blame] | 3644 | g_context->inject_page_fault = kvm_inject_page_fault; |
| 3645 | |
| 3646 | /* |
| 3647 | * Note that arch.mmu.gva_to_gpa translates l2_gva to l1_gpa. The |
| 3648 | * translation of l2_gpa to l1_gpa addresses is done using the |
| 3649 | * arch.nested_mmu.gva_to_gpa function. Basically the gva_to_gpa |
| 3650 | * functions between mmu and nested_mmu are swapped. |
| 3651 | */ |
| 3652 | if (!is_paging(vcpu)) { |
Joerg Roedel | 2d48a98 | 2010-09-10 17:31:01 +0200 | [diff] [blame] | 3653 | g_context->nx = false; |
Joerg Roedel | 02f59dc | 2010-09-10 17:30:54 +0200 | [diff] [blame] | 3654 | g_context->root_level = 0; |
| 3655 | g_context->gva_to_gpa = nonpaging_gva_to_gpa_nested; |
| 3656 | } else if (is_long_mode(vcpu)) { |
Joerg Roedel | 2d48a98 | 2010-09-10 17:31:01 +0200 | [diff] [blame] | 3657 | g_context->nx = is_nx(vcpu); |
Joerg Roedel | 02f59dc | 2010-09-10 17:30:54 +0200 | [diff] [blame] | 3658 | g_context->root_level = PT64_ROOT_LEVEL; |
Davidlohr Bueso | 4d6931c | 2012-03-05 16:53:06 +0100 | [diff] [blame] | 3659 | reset_rsvds_bits_mask(vcpu, g_context); |
Joerg Roedel | 02f59dc | 2010-09-10 17:30:54 +0200 | [diff] [blame] | 3660 | g_context->gva_to_gpa = paging64_gva_to_gpa_nested; |
| 3661 | } else if (is_pae(vcpu)) { |
Joerg Roedel | 2d48a98 | 2010-09-10 17:31:01 +0200 | [diff] [blame] | 3662 | g_context->nx = is_nx(vcpu); |
Joerg Roedel | 02f59dc | 2010-09-10 17:30:54 +0200 | [diff] [blame] | 3663 | g_context->root_level = PT32E_ROOT_LEVEL; |
Davidlohr Bueso | 4d6931c | 2012-03-05 16:53:06 +0100 | [diff] [blame] | 3664 | reset_rsvds_bits_mask(vcpu, g_context); |
Joerg Roedel | 02f59dc | 2010-09-10 17:30:54 +0200 | [diff] [blame] | 3665 | g_context->gva_to_gpa = paging64_gva_to_gpa_nested; |
| 3666 | } else { |
Joerg Roedel | 2d48a98 | 2010-09-10 17:31:01 +0200 | [diff] [blame] | 3667 | g_context->nx = false; |
Joerg Roedel | 02f59dc | 2010-09-10 17:30:54 +0200 | [diff] [blame] | 3668 | g_context->root_level = PT32_ROOT_LEVEL; |
Davidlohr Bueso | 4d6931c | 2012-03-05 16:53:06 +0100 | [diff] [blame] | 3669 | reset_rsvds_bits_mask(vcpu, g_context); |
Joerg Roedel | 02f59dc | 2010-09-10 17:30:54 +0200 | [diff] [blame] | 3670 | g_context->gva_to_gpa = paging32_gva_to_gpa_nested; |
| 3671 | } |
| 3672 | |
| 3673 | return 0; |
| 3674 | } |
| 3675 | |
Joerg Roedel | fb72d16 | 2008-02-07 13:47:44 +0100 | [diff] [blame] | 3676 | static int init_kvm_mmu(struct kvm_vcpu *vcpu) |
| 3677 | { |
Joerg Roedel | 02f59dc | 2010-09-10 17:30:54 +0200 | [diff] [blame] | 3678 | if (mmu_is_nested(vcpu)) |
| 3679 | return init_kvm_nested_mmu(vcpu); |
| 3680 | else if (tdp_enabled) |
Joerg Roedel | fb72d16 | 2008-02-07 13:47:44 +0100 | [diff] [blame] | 3681 | return init_kvm_tdp_mmu(vcpu); |
| 3682 | else |
| 3683 | return init_kvm_softmmu(vcpu); |
| 3684 | } |
| 3685 | |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3686 | static void destroy_kvm_mmu(struct kvm_vcpu *vcpu) |
| 3687 | { |
| 3688 | ASSERT(vcpu); |
Sheng Yang | 62ad075 | 2010-05-12 16:40:41 +0800 | [diff] [blame] | 3689 | if (VALID_PAGE(vcpu->arch.mmu.root_hpa)) |
| 3690 | /* mmu.free() should set root_hpa = INVALID_PAGE */ |
Zhang Xiantao | ad312c7 | 2007-12-13 23:50:52 +0800 | [diff] [blame] | 3691 | vcpu->arch.mmu.free(vcpu); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3692 | } |
| 3693 | |
| 3694 | int kvm_mmu_reset_context(struct kvm_vcpu *vcpu) |
| 3695 | { |
Avi Kivity | 17c3ba9 | 2007-06-04 15:58:30 +0300 | [diff] [blame] | 3696 | destroy_kvm_mmu(vcpu); |
Marcelo Tosatti | f8f7e5e | 2011-06-21 14:00:10 -0300 | [diff] [blame] | 3697 | return init_kvm_mmu(vcpu); |
Avi Kivity | 17c3ba9 | 2007-06-04 15:58:30 +0300 | [diff] [blame] | 3698 | } |
Eddie Dong | 8668a3c | 2007-10-10 14:26:45 +0800 | [diff] [blame] | 3699 | EXPORT_SYMBOL_GPL(kvm_mmu_reset_context); |
Avi Kivity | 17c3ba9 | 2007-06-04 15:58:30 +0300 | [diff] [blame] | 3700 | |
| 3701 | int kvm_mmu_load(struct kvm_vcpu *vcpu) |
| 3702 | { |
Avi Kivity | 714b93d | 2007-01-05 16:36:53 -0800 | [diff] [blame] | 3703 | int r; |
| 3704 | |
Avi Kivity | e2dec93 | 2007-01-05 16:36:54 -0800 | [diff] [blame] | 3705 | r = mmu_topup_memory_caches(vcpu); |
Avi Kivity | 17c3ba9 | 2007-06-04 15:58:30 +0300 | [diff] [blame] | 3706 | if (r) |
| 3707 | goto out; |
Marcelo Tosatti | 8986ecc | 2009-05-12 18:55:45 -0300 | [diff] [blame] | 3708 | r = mmu_alloc_roots(vcpu); |
Avi Kivity | 8facbbf | 2010-05-04 12:58:32 +0300 | [diff] [blame] | 3709 | spin_lock(&vcpu->kvm->mmu_lock); |
Marcelo Tosatti | 0ba73cd | 2008-09-23 13:18:34 -0300 | [diff] [blame] | 3710 | mmu_sync_roots(vcpu); |
Marcelo Tosatti | aaee2c9 | 2007-12-20 19:18:26 -0500 | [diff] [blame] | 3711 | spin_unlock(&vcpu->kvm->mmu_lock); |
Marcelo Tosatti | 8986ecc | 2009-05-12 18:55:45 -0300 | [diff] [blame] | 3712 | if (r) |
| 3713 | goto out; |
Sheng Yang | 3662cb1 | 2009-07-09 17:00:42 +0800 | [diff] [blame] | 3714 | /* set_cr3() should ensure TLB has been flushed */ |
Joerg Roedel | f43addd | 2010-09-10 17:30:40 +0200 | [diff] [blame] | 3715 | vcpu->arch.mmu.set_cr3(vcpu, vcpu->arch.mmu.root_hpa); |
Avi Kivity | 714b93d | 2007-01-05 16:36:53 -0800 | [diff] [blame] | 3716 | out: |
| 3717 | return r; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3718 | } |
Avi Kivity | 17c3ba9 | 2007-06-04 15:58:30 +0300 | [diff] [blame] | 3719 | EXPORT_SYMBOL_GPL(kvm_mmu_load); |
| 3720 | |
| 3721 | void kvm_mmu_unload(struct kvm_vcpu *vcpu) |
| 3722 | { |
| 3723 | mmu_free_roots(vcpu); |
| 3724 | } |
Joerg Roedel | 4b16184 | 2010-09-10 17:31:03 +0200 | [diff] [blame] | 3725 | EXPORT_SYMBOL_GPL(kvm_mmu_unload); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 3726 | |
Avi Kivity | 0028425 | 2007-05-01 16:53:31 +0300 | [diff] [blame] | 3727 | static void mmu_pte_write_new_pte(struct kvm_vcpu *vcpu, |
Xiao Guangrong | 7c56252 | 2011-03-28 10:29:27 +0800 | [diff] [blame] | 3728 | struct kvm_mmu_page *sp, u64 *spte, |
| 3729 | const void *new) |
Avi Kivity | 0028425 | 2007-05-01 16:53:31 +0300 | [diff] [blame] | 3730 | { |
Marcelo Tosatti | 3094538 | 2008-06-11 20:32:40 -0300 | [diff] [blame] | 3731 | if (sp->role.level != PT_PAGE_TABLE_LEVEL) { |
Joerg Roedel | 7e4e405 | 2009-07-27 16:30:46 +0200 | [diff] [blame] | 3732 | ++vcpu->kvm->stat.mmu_pde_zapped; |
| 3733 | return; |
Marcelo Tosatti | 3094538 | 2008-06-11 20:32:40 -0300 | [diff] [blame] | 3734 | } |
Avi Kivity | 0028425 | 2007-05-01 16:53:31 +0300 | [diff] [blame] | 3735 | |
Avi Kivity | 4cee576 | 2007-11-18 16:37:07 +0200 | [diff] [blame] | 3736 | ++vcpu->kvm->stat.mmu_pte_updated; |
Xiao Guangrong | 7c56252 | 2011-03-28 10:29:27 +0800 | [diff] [blame] | 3737 | vcpu->arch.mmu.update_pte(vcpu, sp, spte, new); |
Avi Kivity | 0028425 | 2007-05-01 16:53:31 +0300 | [diff] [blame] | 3738 | } |
| 3739 | |
Avi Kivity | 79539ce | 2007-11-21 02:06:21 +0200 | [diff] [blame] | 3740 | static bool need_remote_flush(u64 old, u64 new) |
| 3741 | { |
| 3742 | if (!is_shadow_present_pte(old)) |
| 3743 | return false; |
| 3744 | if (!is_shadow_present_pte(new)) |
| 3745 | return true; |
| 3746 | if ((old ^ new) & PT64_BASE_ADDR_MASK) |
| 3747 | return true; |
| 3748 | old ^= PT64_NX_MASK; |
| 3749 | new ^= PT64_NX_MASK; |
| 3750 | return (old & ~new & PT64_PERM_MASK) != 0; |
| 3751 | } |
| 3752 | |
Xiao Guangrong | 0671a8e | 2010-06-04 21:56:59 +0800 | [diff] [blame] | 3753 | static void mmu_pte_write_flush_tlb(struct kvm_vcpu *vcpu, bool zap_page, |
| 3754 | bool remote_flush, bool local_flush) |
Avi Kivity | 79539ce | 2007-11-21 02:06:21 +0200 | [diff] [blame] | 3755 | { |
Xiao Guangrong | 0671a8e | 2010-06-04 21:56:59 +0800 | [diff] [blame] | 3756 | if (zap_page) |
| 3757 | return; |
| 3758 | |
| 3759 | if (remote_flush) |
Avi Kivity | 79539ce | 2007-11-21 02:06:21 +0200 | [diff] [blame] | 3760 | kvm_flush_remote_tlbs(vcpu->kvm); |
Xiao Guangrong | 0671a8e | 2010-06-04 21:56:59 +0800 | [diff] [blame] | 3761 | else if (local_flush) |
Avi Kivity | 79539ce | 2007-11-21 02:06:21 +0200 | [diff] [blame] | 3762 | kvm_mmu_flush_tlb(vcpu); |
| 3763 | } |
| 3764 | |
Xiao Guangrong | 889e5cb | 2011-09-22 16:57:23 +0800 | [diff] [blame] | 3765 | static u64 mmu_pte_write_fetch_gpte(struct kvm_vcpu *vcpu, gpa_t *gpa, |
| 3766 | const u8 *new, int *bytes) |
Avi Kivity | da4a00f | 2007-01-05 16:36:44 -0800 | [diff] [blame] | 3767 | { |
Xiao Guangrong | 889e5cb | 2011-09-22 16:57:23 +0800 | [diff] [blame] | 3768 | u64 gentry; |
| 3769 | int r; |
Avi Kivity | 72016f3 | 2010-03-15 13:59:53 +0200 | [diff] [blame] | 3770 | |
Avi Kivity | 08e850c | 2010-03-15 13:59:57 +0200 | [diff] [blame] | 3771 | /* |
| 3772 | * 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] | 3773 | * as the current vcpu paging mode since we update the sptes only |
| 3774 | * when they have the same mode. |
Avi Kivity | 08e850c | 2010-03-15 13:59:57 +0200 | [diff] [blame] | 3775 | */ |
Xiao Guangrong | 889e5cb | 2011-09-22 16:57:23 +0800 | [diff] [blame] | 3776 | if (is_pae(vcpu) && *bytes == 4) { |
Avi Kivity | 08e850c | 2010-03-15 13:59:57 +0200 | [diff] [blame] | 3777 | /* 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] | 3778 | *gpa &= ~(gpa_t)7; |
| 3779 | *bytes = 8; |
| 3780 | r = kvm_read_guest(vcpu->kvm, *gpa, &gentry, min(*bytes, 8)); |
Avi Kivity | 08e850c | 2010-03-15 13:59:57 +0200 | [diff] [blame] | 3781 | if (r) |
| 3782 | gentry = 0; |
| 3783 | new = (const u8 *)&gentry; |
| 3784 | } |
| 3785 | |
Xiao Guangrong | 889e5cb | 2011-09-22 16:57:23 +0800 | [diff] [blame] | 3786 | switch (*bytes) { |
Avi Kivity | 72016f3 | 2010-03-15 13:59:53 +0200 | [diff] [blame] | 3787 | case 4: |
| 3788 | gentry = *(const u32 *)new; |
| 3789 | break; |
| 3790 | case 8: |
| 3791 | gentry = *(const u64 *)new; |
| 3792 | break; |
| 3793 | default: |
| 3794 | gentry = 0; |
| 3795 | break; |
| 3796 | } |
| 3797 | |
Xiao Guangrong | 889e5cb | 2011-09-22 16:57:23 +0800 | [diff] [blame] | 3798 | return gentry; |
| 3799 | } |
| 3800 | |
| 3801 | /* |
| 3802 | * If we're seeing too many writes to a page, it may no longer be a page table, |
| 3803 | * or we may be forking, in which case it is better to unmap the page. |
| 3804 | */ |
Xiao Guangrong | a138fe7 | 2011-12-16 18:18:10 +0800 | [diff] [blame] | 3805 | static bool detect_write_flooding(struct kvm_mmu_page *sp) |
Xiao Guangrong | 889e5cb | 2011-09-22 16:57:23 +0800 | [diff] [blame] | 3806 | { |
Xiao Guangrong | a30f47c | 2011-09-22 16:58:36 +0800 | [diff] [blame] | 3807 | /* |
| 3808 | * Skip write-flooding detected for the sp whose level is 1, because |
| 3809 | * it can become unsync, then the guest page is not write-protected. |
| 3810 | */ |
Davidlohr Bueso | f71fa31 | 2012-04-18 12:24:29 +0200 | [diff] [blame] | 3811 | if (sp->role.level == PT_PAGE_TABLE_LEVEL) |
Xiao Guangrong | a30f47c | 2011-09-22 16:58:36 +0800 | [diff] [blame] | 3812 | return false; |
Xiao Guangrong | 889e5cb | 2011-09-22 16:57:23 +0800 | [diff] [blame] | 3813 | |
Xiao Guangrong | a30f47c | 2011-09-22 16:58:36 +0800 | [diff] [blame] | 3814 | return ++sp->write_flooding_count >= 3; |
Xiao Guangrong | 889e5cb | 2011-09-22 16:57:23 +0800 | [diff] [blame] | 3815 | } |
| 3816 | |
| 3817 | /* |
| 3818 | * Misaligned accesses are too much trouble to fix up; also, they usually |
| 3819 | * indicate a page is not used as a page table. |
| 3820 | */ |
| 3821 | static bool detect_write_misaligned(struct kvm_mmu_page *sp, gpa_t gpa, |
| 3822 | int bytes) |
| 3823 | { |
| 3824 | unsigned offset, pte_size, misaligned; |
| 3825 | |
| 3826 | pgprintk("misaligned: gpa %llx bytes %d role %x\n", |
| 3827 | gpa, bytes, sp->role.word); |
| 3828 | |
| 3829 | offset = offset_in_page(gpa); |
| 3830 | pte_size = sp->role.cr4_pae ? 8 : 4; |
Xiao Guangrong | 5d9ca30 | 2011-09-22 16:57:55 +0800 | [diff] [blame] | 3831 | |
| 3832 | /* |
| 3833 | * Sometimes, the OS only writes the last one bytes to update status |
| 3834 | * bits, for example, in linux, andb instruction is used in clear_bit(). |
| 3835 | */ |
| 3836 | if (!(offset & (pte_size - 1)) && bytes == 1) |
| 3837 | return false; |
| 3838 | |
Xiao Guangrong | 889e5cb | 2011-09-22 16:57:23 +0800 | [diff] [blame] | 3839 | misaligned = (offset ^ (offset + bytes - 1)) & ~(pte_size - 1); |
| 3840 | misaligned |= bytes < 4; |
| 3841 | |
| 3842 | return misaligned; |
| 3843 | } |
| 3844 | |
| 3845 | static u64 *get_written_sptes(struct kvm_mmu_page *sp, gpa_t gpa, int *nspte) |
| 3846 | { |
| 3847 | unsigned page_offset, quadrant; |
| 3848 | u64 *spte; |
| 3849 | int level; |
| 3850 | |
| 3851 | page_offset = offset_in_page(gpa); |
| 3852 | level = sp->role.level; |
| 3853 | *nspte = 1; |
| 3854 | if (!sp->role.cr4_pae) { |
| 3855 | page_offset <<= 1; /* 32->64 */ |
| 3856 | /* |
| 3857 | * A 32-bit pde maps 4MB while the shadow pdes map |
| 3858 | * only 2MB. So we need to double the offset again |
| 3859 | * and zap two pdes instead of one. |
| 3860 | */ |
| 3861 | if (level == PT32_ROOT_LEVEL) { |
| 3862 | page_offset &= ~7; /* kill rounding error */ |
| 3863 | page_offset <<= 1; |
| 3864 | *nspte = 2; |
| 3865 | } |
| 3866 | quadrant = page_offset >> PAGE_SHIFT; |
| 3867 | page_offset &= ~PAGE_MASK; |
| 3868 | if (quadrant != sp->role.quadrant) |
| 3869 | return NULL; |
| 3870 | } |
| 3871 | |
| 3872 | spte = &sp->spt[page_offset / sizeof(*spte)]; |
| 3873 | return spte; |
| 3874 | } |
| 3875 | |
| 3876 | void kvm_mmu_pte_write(struct kvm_vcpu *vcpu, gpa_t gpa, |
| 3877 | const u8 *new, int bytes) |
| 3878 | { |
| 3879 | gfn_t gfn = gpa >> PAGE_SHIFT; |
| 3880 | union kvm_mmu_page_role mask = { .word = 0 }; |
| 3881 | struct kvm_mmu_page *sp; |
| 3882 | struct hlist_node *node; |
| 3883 | LIST_HEAD(invalid_list); |
| 3884 | u64 entry, gentry, *spte; |
| 3885 | int npte; |
Xiao Guangrong | a30f47c | 2011-09-22 16:58:36 +0800 | [diff] [blame] | 3886 | bool remote_flush, local_flush, zap_page; |
Xiao Guangrong | 889e5cb | 2011-09-22 16:57:23 +0800 | [diff] [blame] | 3887 | |
| 3888 | /* |
| 3889 | * If we don't have indirect shadow pages, it means no page is |
| 3890 | * write-protected, so we can exit simply. |
| 3891 | */ |
| 3892 | if (!ACCESS_ONCE(vcpu->kvm->arch.indirect_shadow_pages)) |
| 3893 | return; |
| 3894 | |
| 3895 | zap_page = remote_flush = local_flush = false; |
| 3896 | |
| 3897 | pgprintk("%s: gpa %llx bytes %d\n", __func__, gpa, bytes); |
| 3898 | |
| 3899 | gentry = mmu_pte_write_fetch_gpte(vcpu, &gpa, new, &bytes); |
| 3900 | |
| 3901 | /* |
| 3902 | * No need to care whether allocation memory is successful |
| 3903 | * or not since pte prefetch is skiped if it does not have |
| 3904 | * enough objects in the cache. |
| 3905 | */ |
| 3906 | mmu_topup_memory_caches(vcpu); |
| 3907 | |
| 3908 | spin_lock(&vcpu->kvm->mmu_lock); |
| 3909 | ++vcpu->kvm->stat.mmu_pte_write; |
Xiao Guangrong | 0375f7f | 2011-11-28 20:41:00 +0800 | [diff] [blame] | 3910 | kvm_mmu_audit(vcpu, AUDIT_PRE_PTE_WRITE); |
Xiao Guangrong | 889e5cb | 2011-09-22 16:57:23 +0800 | [diff] [blame] | 3911 | |
Xiao Guangrong | fa1de2b | 2010-07-16 11:19:51 +0800 | [diff] [blame] | 3912 | mask.cr0_wp = mask.cr4_pae = mask.nxe = 1; |
Xiao Guangrong | f41d335 | 2010-06-04 21:56:11 +0800 | [diff] [blame] | 3913 | for_each_gfn_indirect_valid_sp(vcpu->kvm, sp, gfn, node) { |
Xiao Guangrong | a30f47c | 2011-09-22 16:58:36 +0800 | [diff] [blame] | 3914 | if (detect_write_misaligned(sp, gpa, bytes) || |
Xiao Guangrong | a138fe7 | 2011-12-16 18:18:10 +0800 | [diff] [blame] | 3915 | detect_write_flooding(sp)) { |
Xiao Guangrong | 0671a8e | 2010-06-04 21:56:59 +0800 | [diff] [blame] | 3916 | zap_page |= !!kvm_mmu_prepare_zap_page(vcpu->kvm, sp, |
Xiao Guangrong | f41d335 | 2010-06-04 21:56:11 +0800 | [diff] [blame] | 3917 | &invalid_list); |
Avi Kivity | 4cee576 | 2007-11-18 16:37:07 +0200 | [diff] [blame] | 3918 | ++vcpu->kvm->stat.mmu_flooded; |
Avi Kivity | 0e7bc4b | 2007-01-05 16:36:48 -0800 | [diff] [blame] | 3919 | continue; |
| 3920 | } |
Xiao Guangrong | 889e5cb | 2011-09-22 16:57:23 +0800 | [diff] [blame] | 3921 | |
| 3922 | spte = get_written_sptes(sp, gpa, &npte); |
| 3923 | if (!spte) |
| 3924 | continue; |
| 3925 | |
Xiao Guangrong | 0671a8e | 2010-06-04 21:56:59 +0800 | [diff] [blame] | 3926 | local_flush = true; |
Avi Kivity | ac1b714 | 2007-03-08 17:13:32 +0200 | [diff] [blame] | 3927 | while (npte--) { |
Avi Kivity | 79539ce | 2007-11-21 02:06:21 +0200 | [diff] [blame] | 3928 | entry = *spte; |
Xiao Guangrong | 38e3b2b | 2011-05-15 23:27:52 +0800 | [diff] [blame] | 3929 | mmu_page_zap_pte(vcpu->kvm, sp, spte); |
Xiao Guangrong | fa1de2b | 2010-07-16 11:19:51 +0800 | [diff] [blame] | 3930 | if (gentry && |
| 3931 | !((sp->role.word ^ vcpu->arch.mmu.base_role.word) |
Xiao Guangrong | f759e2b | 2011-09-22 16:53:17 +0800 | [diff] [blame] | 3932 | & mask.word) && rmap_can_add(vcpu)) |
Xiao Guangrong | 7c56252 | 2011-03-28 10:29:27 +0800 | [diff] [blame] | 3933 | mmu_pte_write_new_pte(vcpu, sp, spte, &gentry); |
Xiao Guangrong | 0671a8e | 2010-06-04 21:56:59 +0800 | [diff] [blame] | 3934 | if (!remote_flush && need_remote_flush(entry, *spte)) |
| 3935 | remote_flush = true; |
Avi Kivity | ac1b714 | 2007-03-08 17:13:32 +0200 | [diff] [blame] | 3936 | ++spte; |
Avi Kivity | 9b7a032 | 2007-01-05 16:36:45 -0800 | [diff] [blame] | 3937 | } |
Avi Kivity | 9b7a032 | 2007-01-05 16:36:45 -0800 | [diff] [blame] | 3938 | } |
Xiao Guangrong | 0671a8e | 2010-06-04 21:56:59 +0800 | [diff] [blame] | 3939 | mmu_pte_write_flush_tlb(vcpu, zap_page, remote_flush, local_flush); |
Xiao Guangrong | d98ba05 | 2010-06-04 21:55:29 +0800 | [diff] [blame] | 3940 | kvm_mmu_commit_zap_page(vcpu->kvm, &invalid_list); |
Xiao Guangrong | 0375f7f | 2011-11-28 20:41:00 +0800 | [diff] [blame] | 3941 | kvm_mmu_audit(vcpu, AUDIT_POST_PTE_WRITE); |
Marcelo Tosatti | aaee2c9 | 2007-12-20 19:18:26 -0500 | [diff] [blame] | 3942 | spin_unlock(&vcpu->kvm->mmu_lock); |
Avi Kivity | da4a00f | 2007-01-05 16:36:44 -0800 | [diff] [blame] | 3943 | } |
| 3944 | |
Avi Kivity | a436036 | 2007-01-05 16:36:45 -0800 | [diff] [blame] | 3945 | int kvm_mmu_unprotect_page_virt(struct kvm_vcpu *vcpu, gva_t gva) |
| 3946 | { |
Marcelo Tosatti | 10589a4 | 2007-12-20 19:18:22 -0500 | [diff] [blame] | 3947 | gpa_t gpa; |
| 3948 | int r; |
Avi Kivity | a436036 | 2007-01-05 16:36:45 -0800 | [diff] [blame] | 3949 | |
Joerg Roedel | c5a78f2b | 2010-09-10 17:30:39 +0200 | [diff] [blame] | 3950 | if (vcpu->arch.mmu.direct_map) |
Avi Kivity | 60f2478 | 2009-08-27 13:37:06 +0300 | [diff] [blame] | 3951 | return 0; |
| 3952 | |
Gleb Natapov | 1871c60 | 2010-02-10 14:21:32 +0200 | [diff] [blame] | 3953 | gpa = kvm_mmu_gva_to_gpa_read(vcpu, gva, NULL); |
Marcelo Tosatti | 10589a4 | 2007-12-20 19:18:22 -0500 | [diff] [blame] | 3954 | |
Marcelo Tosatti | 10589a4 | 2007-12-20 19:18:22 -0500 | [diff] [blame] | 3955 | r = kvm_mmu_unprotect_page(vcpu->kvm, gpa >> PAGE_SHIFT); |
Xiao Guangrong | 1cb3f3a | 2011-09-22 17:02:48 +0800 | [diff] [blame] | 3956 | |
Marcelo Tosatti | 10589a4 | 2007-12-20 19:18:22 -0500 | [diff] [blame] | 3957 | return r; |
Avi Kivity | a436036 | 2007-01-05 16:36:45 -0800 | [diff] [blame] | 3958 | } |
Avi Kivity | 577bdc4 | 2008-07-19 08:57:05 +0300 | [diff] [blame] | 3959 | EXPORT_SYMBOL_GPL(kvm_mmu_unprotect_page_virt); |
Avi Kivity | a436036 | 2007-01-05 16:36:45 -0800 | [diff] [blame] | 3960 | |
Avi Kivity | 22d95b1 | 2007-09-14 20:26:06 +0300 | [diff] [blame] | 3961 | void __kvm_mmu_free_some_pages(struct kvm_vcpu *vcpu) |
Avi Kivity | ebeace8 | 2007-01-05 16:36:47 -0800 | [diff] [blame] | 3962 | { |
Xiao Guangrong | d98ba05 | 2010-06-04 21:55:29 +0800 | [diff] [blame] | 3963 | LIST_HEAD(invalid_list); |
Xiao Guangrong | 103ad25 | 2010-06-04 21:54:38 +0800 | [diff] [blame] | 3964 | |
Dave Hansen | e0df7b9 | 2010-08-19 18:11:05 -0700 | [diff] [blame] | 3965 | while (kvm_mmu_available_pages(vcpu->kvm) < KVM_REFILL_PAGES && |
Izik Eidus | 3b80fff | 2009-07-28 15:26:58 -0300 | [diff] [blame] | 3966 | !list_empty(&vcpu->kvm->arch.active_mmu_pages)) { |
Avi Kivity | 4db3531 | 2007-11-21 15:28:32 +0200 | [diff] [blame] | 3967 | struct kvm_mmu_page *sp; |
Avi Kivity | ebeace8 | 2007-01-05 16:36:47 -0800 | [diff] [blame] | 3968 | |
Zhang Xiantao | f05e70a | 2007-12-14 10:01:48 +0800 | [diff] [blame] | 3969 | sp = container_of(vcpu->kvm->arch.active_mmu_pages.prev, |
Avi Kivity | 4db3531 | 2007-11-21 15:28:32 +0200 | [diff] [blame] | 3970 | struct kvm_mmu_page, link); |
Dave Hansen | e0df7b9 | 2010-08-19 18:11:05 -0700 | [diff] [blame] | 3971 | kvm_mmu_prepare_zap_page(vcpu->kvm, sp, &invalid_list); |
Avi Kivity | 4cee576 | 2007-11-18 16:37:07 +0200 | [diff] [blame] | 3972 | ++vcpu->kvm->stat.mmu_recycled; |
Avi Kivity | ebeace8 | 2007-01-05 16:36:47 -0800 | [diff] [blame] | 3973 | } |
Xiao Guangrong | aa6bd18 | 2011-07-12 03:26:40 +0800 | [diff] [blame] | 3974 | kvm_mmu_commit_zap_page(vcpu->kvm, &invalid_list); |
Avi Kivity | ebeace8 | 2007-01-05 16:36:47 -0800 | [diff] [blame] | 3975 | } |
Avi Kivity | ebeace8 | 2007-01-05 16:36:47 -0800 | [diff] [blame] | 3976 | |
Xiao Guangrong | 1cb3f3a | 2011-09-22 17:02:48 +0800 | [diff] [blame] | 3977 | static bool is_mmio_page_fault(struct kvm_vcpu *vcpu, gva_t addr) |
| 3978 | { |
| 3979 | if (vcpu->arch.mmu.direct_map || mmu_is_nested(vcpu)) |
| 3980 | return vcpu_match_mmio_gpa(vcpu, addr); |
| 3981 | |
| 3982 | return vcpu_match_mmio_gva(vcpu, addr); |
| 3983 | } |
| 3984 | |
Andre Przywara | dc25e89 | 2010-12-21 11:12:07 +0100 | [diff] [blame] | 3985 | int kvm_mmu_page_fault(struct kvm_vcpu *vcpu, gva_t cr2, u32 error_code, |
| 3986 | void *insn, int insn_len) |
Avi Kivity | 3067714 | 2007-10-28 18:48:59 +0200 | [diff] [blame] | 3987 | { |
Xiao Guangrong | 1cb3f3a | 2011-09-22 17:02:48 +0800 | [diff] [blame] | 3988 | int r, emulation_type = EMULTYPE_RETRY; |
Avi Kivity | 3067714 | 2007-10-28 18:48:59 +0200 | [diff] [blame] | 3989 | enum emulation_result er; |
| 3990 | |
Gleb Natapov | 56028d0 | 2010-10-17 18:13:42 +0200 | [diff] [blame] | 3991 | r = vcpu->arch.mmu.page_fault(vcpu, cr2, error_code, false); |
Avi Kivity | 3067714 | 2007-10-28 18:48:59 +0200 | [diff] [blame] | 3992 | if (r < 0) |
| 3993 | goto out; |
| 3994 | |
| 3995 | if (!r) { |
| 3996 | r = 1; |
| 3997 | goto out; |
| 3998 | } |
| 3999 | |
Xiao Guangrong | 1cb3f3a | 2011-09-22 17:02:48 +0800 | [diff] [blame] | 4000 | if (is_mmio_page_fault(vcpu, cr2)) |
| 4001 | emulation_type = 0; |
| 4002 | |
| 4003 | er = x86_emulate_instruction(vcpu, cr2, emulation_type, insn, insn_len); |
Avi Kivity | 3067714 | 2007-10-28 18:48:59 +0200 | [diff] [blame] | 4004 | |
| 4005 | switch (er) { |
| 4006 | case EMULATE_DONE: |
| 4007 | return 1; |
| 4008 | case EMULATE_DO_MMIO: |
| 4009 | ++vcpu->stat.mmio_exits; |
Gleb Natapov | 6d77dbf | 2010-05-10 11:16:56 +0300 | [diff] [blame] | 4010 | /* fall through */ |
Avi Kivity | 3067714 | 2007-10-28 18:48:59 +0200 | [diff] [blame] | 4011 | case EMULATE_FAIL: |
Avi Kivity | 3f5d18a | 2009-06-11 15:43:28 +0300 | [diff] [blame] | 4012 | return 0; |
Avi Kivity | 3067714 | 2007-10-28 18:48:59 +0200 | [diff] [blame] | 4013 | default: |
| 4014 | BUG(); |
| 4015 | } |
| 4016 | out: |
Avi Kivity | 3067714 | 2007-10-28 18:48:59 +0200 | [diff] [blame] | 4017 | return r; |
| 4018 | } |
| 4019 | EXPORT_SYMBOL_GPL(kvm_mmu_page_fault); |
| 4020 | |
Marcelo Tosatti | a705289 | 2008-09-23 13:18:35 -0300 | [diff] [blame] | 4021 | void kvm_mmu_invlpg(struct kvm_vcpu *vcpu, gva_t gva) |
| 4022 | { |
Marcelo Tosatti | a705289 | 2008-09-23 13:18:35 -0300 | [diff] [blame] | 4023 | vcpu->arch.mmu.invlpg(vcpu, gva); |
Marcelo Tosatti | a705289 | 2008-09-23 13:18:35 -0300 | [diff] [blame] | 4024 | kvm_mmu_flush_tlb(vcpu); |
| 4025 | ++vcpu->stat.invlpg; |
| 4026 | } |
| 4027 | EXPORT_SYMBOL_GPL(kvm_mmu_invlpg); |
| 4028 | |
Joerg Roedel | 1855267 | 2008-02-07 13:47:41 +0100 | [diff] [blame] | 4029 | void kvm_enable_tdp(void) |
| 4030 | { |
| 4031 | tdp_enabled = true; |
| 4032 | } |
| 4033 | EXPORT_SYMBOL_GPL(kvm_enable_tdp); |
| 4034 | |
Joerg Roedel | 5f4cb66 | 2008-07-14 20:36:36 +0200 | [diff] [blame] | 4035 | void kvm_disable_tdp(void) |
| 4036 | { |
| 4037 | tdp_enabled = false; |
| 4038 | } |
| 4039 | EXPORT_SYMBOL_GPL(kvm_disable_tdp); |
| 4040 | |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 4041 | static void free_mmu_pages(struct kvm_vcpu *vcpu) |
| 4042 | { |
Zhang Xiantao | ad312c7 | 2007-12-13 23:50:52 +0800 | [diff] [blame] | 4043 | free_page((unsigned long)vcpu->arch.mmu.pae_root); |
Joerg Roedel | 81407ca | 2010-09-10 17:31:00 +0200 | [diff] [blame] | 4044 | if (vcpu->arch.mmu.lm_root != NULL) |
| 4045 | free_page((unsigned long)vcpu->arch.mmu.lm_root); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 4046 | } |
| 4047 | |
| 4048 | static int alloc_mmu_pages(struct kvm_vcpu *vcpu) |
| 4049 | { |
Avi Kivity | 17ac10a | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 4050 | struct page *page; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 4051 | int i; |
| 4052 | |
| 4053 | ASSERT(vcpu); |
| 4054 | |
Avi Kivity | 17ac10a | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 4055 | /* |
| 4056 | * When emulating 32-bit mode, cr3 is only 32 bits even on x86_64. |
| 4057 | * Therefore we need to allocate shadow page tables in the first |
| 4058 | * 4GB of memory, which happens to fit the DMA32 zone. |
| 4059 | */ |
| 4060 | page = alloc_page(GFP_KERNEL | __GFP_DMA32); |
| 4061 | if (!page) |
Wei Yongjun | d7fa6ab | 2010-01-22 16:55:05 +0800 | [diff] [blame] | 4062 | return -ENOMEM; |
| 4063 | |
Zhang Xiantao | ad312c7 | 2007-12-13 23:50:52 +0800 | [diff] [blame] | 4064 | vcpu->arch.mmu.pae_root = page_address(page); |
Avi Kivity | 17ac10a | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 4065 | for (i = 0; i < 4; ++i) |
Zhang Xiantao | ad312c7 | 2007-12-13 23:50:52 +0800 | [diff] [blame] | 4066 | vcpu->arch.mmu.pae_root[i] = INVALID_PAGE; |
Avi Kivity | 17ac10a | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 4067 | |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 4068 | return 0; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 4069 | } |
| 4070 | |
Ingo Molnar | 8018c27 | 2006-12-29 16:50:01 -0800 | [diff] [blame] | 4071 | int kvm_mmu_create(struct kvm_vcpu *vcpu) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 4072 | { |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 4073 | ASSERT(vcpu); |
Xiao Guangrong | e459e32 | 2011-11-28 20:42:16 +0800 | [diff] [blame] | 4074 | |
| 4075 | vcpu->arch.walk_mmu = &vcpu->arch.mmu; |
| 4076 | vcpu->arch.mmu.root_hpa = INVALID_PAGE; |
| 4077 | vcpu->arch.mmu.translate_gpa = translate_gpa; |
| 4078 | vcpu->arch.nested_mmu.translate_gpa = translate_nested_gpa; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 4079 | |
Ingo Molnar | 8018c27 | 2006-12-29 16:50:01 -0800 | [diff] [blame] | 4080 | return alloc_mmu_pages(vcpu); |
| 4081 | } |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 4082 | |
Ingo Molnar | 8018c27 | 2006-12-29 16:50:01 -0800 | [diff] [blame] | 4083 | int kvm_mmu_setup(struct kvm_vcpu *vcpu) |
| 4084 | { |
| 4085 | ASSERT(vcpu); |
Zhang Xiantao | ad312c7 | 2007-12-13 23:50:52 +0800 | [diff] [blame] | 4086 | ASSERT(!VALID_PAGE(vcpu->arch.mmu.root_hpa)); |
Avi Kivity | 2c26495 | 2006-12-22 01:05:28 -0800 | [diff] [blame] | 4087 | |
Ingo Molnar | 8018c27 | 2006-12-29 16:50:01 -0800 | [diff] [blame] | 4088 | return init_kvm_mmu(vcpu); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 4089 | } |
| 4090 | |
Avi Kivity | 90cb052 | 2007-07-17 13:04:56 +0300 | [diff] [blame] | 4091 | void kvm_mmu_slot_remove_write_access(struct kvm *kvm, int slot) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 4092 | { |
Avi Kivity | 4db3531 | 2007-11-21 15:28:32 +0200 | [diff] [blame] | 4093 | struct kvm_mmu_page *sp; |
Xiao Guangrong | d13bc5b | 2012-06-20 15:57:15 +0800 | [diff] [blame] | 4094 | bool flush = false; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 4095 | |
Zhang Xiantao | f05e70a | 2007-12-14 10:01:48 +0800 | [diff] [blame] | 4096 | list_for_each_entry(sp, &kvm->arch.active_mmu_pages, link) { |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 4097 | int i; |
| 4098 | u64 *pt; |
| 4099 | |
Sheng Yang | 291f26b | 2008-10-16 17:30:57 +0800 | [diff] [blame] | 4100 | if (!test_bit(slot, sp->slot_bitmap)) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 4101 | continue; |
| 4102 | |
Avi Kivity | 4db3531 | 2007-11-21 15:28:32 +0200 | [diff] [blame] | 4103 | pt = sp->spt; |
Avi Kivity | 8234b22 | 2010-12-27 12:08:45 +0200 | [diff] [blame] | 4104 | for (i = 0; i < PT64_ENT_PER_PAGE; ++i) { |
Xiao Guangrong | da8dc75 | 2011-03-04 18:56:41 +0800 | [diff] [blame] | 4105 | if (!is_shadow_present_pte(pt[i]) || |
| 4106 | !is_last_spte(pt[i], sp->role.level)) |
| 4107 | continue; |
| 4108 | |
Xiao Guangrong | 49fde34 | 2012-06-20 15:58:58 +0800 | [diff] [blame] | 4109 | spte_write_protect(kvm, &pt[i], &flush, false); |
Avi Kivity | 8234b22 | 2010-12-27 12:08:45 +0200 | [diff] [blame] | 4110 | } |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 4111 | } |
Avi Kivity | 171d595 | 2008-08-27 16:40:51 +0300 | [diff] [blame] | 4112 | kvm_flush_remote_tlbs(kvm); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 4113 | } |
Avi Kivity | 37a7d8b | 2007-01-05 16:36:56 -0800 | [diff] [blame] | 4114 | |
Avi Kivity | 90cb052 | 2007-07-17 13:04:56 +0300 | [diff] [blame] | 4115 | void kvm_mmu_zap_all(struct kvm *kvm) |
Dor Laor | e0fa826 | 2007-03-30 13:06:33 +0300 | [diff] [blame] | 4116 | { |
Avi Kivity | 4db3531 | 2007-11-21 15:28:32 +0200 | [diff] [blame] | 4117 | struct kvm_mmu_page *sp, *node; |
Xiao Guangrong | d98ba05 | 2010-06-04 21:55:29 +0800 | [diff] [blame] | 4118 | LIST_HEAD(invalid_list); |
Dor Laor | e0fa826 | 2007-03-30 13:06:33 +0300 | [diff] [blame] | 4119 | |
Marcelo Tosatti | aaee2c9 | 2007-12-20 19:18:26 -0500 | [diff] [blame] | 4120 | spin_lock(&kvm->mmu_lock); |
Xiao Guangrong | 3246af0 | 2010-04-16 16:35:54 +0800 | [diff] [blame] | 4121 | restart: |
Zhang Xiantao | f05e70a | 2007-12-14 10:01:48 +0800 | [diff] [blame] | 4122 | 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] | 4123 | if (kvm_mmu_prepare_zap_page(kvm, sp, &invalid_list)) |
Xiao Guangrong | 3246af0 | 2010-04-16 16:35:54 +0800 | [diff] [blame] | 4124 | goto restart; |
| 4125 | |
Xiao Guangrong | d98ba05 | 2010-06-04 21:55:29 +0800 | [diff] [blame] | 4126 | kvm_mmu_commit_zap_page(kvm, &invalid_list); |
Marcelo Tosatti | aaee2c9 | 2007-12-20 19:18:26 -0500 | [diff] [blame] | 4127 | spin_unlock(&kvm->mmu_lock); |
Dor Laor | e0fa826 | 2007-03-30 13:06:33 +0300 | [diff] [blame] | 4128 | } |
| 4129 | |
Jan Kiszka | 3d56cbd | 2011-12-02 18:35:24 +0100 | [diff] [blame] | 4130 | static void kvm_mmu_remove_some_alloc_mmu_pages(struct kvm *kvm, |
| 4131 | struct list_head *invalid_list) |
Izik Eidus | 3ee16c8 | 2008-03-30 15:17:21 +0300 | [diff] [blame] | 4132 | { |
| 4133 | struct kvm_mmu_page *page; |
| 4134 | |
Xiao Guangrong | 85b7059 | 2012-07-03 14:31:43 +0800 | [diff] [blame] | 4135 | if (list_empty(&kvm->arch.active_mmu_pages)) |
| 4136 | return; |
| 4137 | |
Izik Eidus | 3ee16c8 | 2008-03-30 15:17:21 +0300 | [diff] [blame] | 4138 | page = container_of(kvm->arch.active_mmu_pages.prev, |
| 4139 | struct kvm_mmu_page, link); |
Jan Kiszka | 3d56cbd | 2011-12-02 18:35:24 +0100 | [diff] [blame] | 4140 | kvm_mmu_prepare_zap_page(kvm, page, invalid_list); |
Izik Eidus | 3ee16c8 | 2008-03-30 15:17:21 +0300 | [diff] [blame] | 4141 | } |
| 4142 | |
Ying Han | 1495f23 | 2011-05-24 17:12:27 -0700 | [diff] [blame] | 4143 | static int mmu_shrink(struct shrinker *shrink, struct shrink_control *sc) |
Izik Eidus | 3ee16c8 | 2008-03-30 15:17:21 +0300 | [diff] [blame] | 4144 | { |
| 4145 | struct kvm *kvm; |
Ying Han | 1495f23 | 2011-05-24 17:12:27 -0700 | [diff] [blame] | 4146 | int nr_to_scan = sc->nr_to_scan; |
Dave Hansen | 45221ab | 2010-08-19 18:11:37 -0700 | [diff] [blame] | 4147 | |
| 4148 | if (nr_to_scan == 0) |
| 4149 | goto out; |
Izik Eidus | 3ee16c8 | 2008-03-30 15:17:21 +0300 | [diff] [blame] | 4150 | |
Jan Kiszka | e935b83 | 2011-02-08 12:55:33 +0100 | [diff] [blame] | 4151 | raw_spin_lock(&kvm_lock); |
Izik Eidus | 3ee16c8 | 2008-03-30 15:17:21 +0300 | [diff] [blame] | 4152 | |
| 4153 | list_for_each_entry(kvm, &vm_list, vm_list) { |
Jan Kiszka | 3d56cbd | 2011-12-02 18:35:24 +0100 | [diff] [blame] | 4154 | int idx; |
Xiao Guangrong | d98ba05 | 2010-06-04 21:55:29 +0800 | [diff] [blame] | 4155 | LIST_HEAD(invalid_list); |
Izik Eidus | 3ee16c8 | 2008-03-30 15:17:21 +0300 | [diff] [blame] | 4156 | |
Gleb Natapov | 1952639 | 2012-06-04 14:53:23 +0300 | [diff] [blame] | 4157 | /* |
| 4158 | * n_used_mmu_pages is accessed without holding kvm->mmu_lock |
| 4159 | * here. We may skip a VM instance errorneosly, but we do not |
| 4160 | * want to shrink a VM that only started to populate its MMU |
| 4161 | * anyway. |
| 4162 | */ |
| 4163 | if (kvm->arch.n_used_mmu_pages > 0) { |
| 4164 | if (!nr_to_scan--) |
| 4165 | break; |
| 4166 | continue; |
| 4167 | } |
| 4168 | |
Marcelo Tosatti | f656ce0 | 2009-12-23 14:35:25 -0200 | [diff] [blame] | 4169 | idx = srcu_read_lock(&kvm->srcu); |
Izik Eidus | 3ee16c8 | 2008-03-30 15:17:21 +0300 | [diff] [blame] | 4170 | spin_lock(&kvm->mmu_lock); |
Izik Eidus | 3ee16c8 | 2008-03-30 15:17:21 +0300 | [diff] [blame] | 4171 | |
Gleb Natapov | 1952639 | 2012-06-04 14:53:23 +0300 | [diff] [blame] | 4172 | kvm_mmu_remove_some_alloc_mmu_pages(kvm, &invalid_list); |
Xiao Guangrong | d98ba05 | 2010-06-04 21:55:29 +0800 | [diff] [blame] | 4173 | kvm_mmu_commit_zap_page(kvm, &invalid_list); |
Gleb Natapov | 1952639 | 2012-06-04 14:53:23 +0300 | [diff] [blame] | 4174 | |
Izik Eidus | 3ee16c8 | 2008-03-30 15:17:21 +0300 | [diff] [blame] | 4175 | spin_unlock(&kvm->mmu_lock); |
Marcelo Tosatti | f656ce0 | 2009-12-23 14:35:25 -0200 | [diff] [blame] | 4176 | srcu_read_unlock(&kvm->srcu, idx); |
Gleb Natapov | 1952639 | 2012-06-04 14:53:23 +0300 | [diff] [blame] | 4177 | |
| 4178 | list_move_tail(&kvm->vm_list, &vm_list); |
| 4179 | break; |
Izik Eidus | 3ee16c8 | 2008-03-30 15:17:21 +0300 | [diff] [blame] | 4180 | } |
Izik Eidus | 3ee16c8 | 2008-03-30 15:17:21 +0300 | [diff] [blame] | 4181 | |
Jan Kiszka | e935b83 | 2011-02-08 12:55:33 +0100 | [diff] [blame] | 4182 | raw_spin_unlock(&kvm_lock); |
Izik Eidus | 3ee16c8 | 2008-03-30 15:17:21 +0300 | [diff] [blame] | 4183 | |
Dave Hansen | 45221ab | 2010-08-19 18:11:37 -0700 | [diff] [blame] | 4184 | out: |
| 4185 | return percpu_counter_read_positive(&kvm_total_used_mmu_pages); |
Izik Eidus | 3ee16c8 | 2008-03-30 15:17:21 +0300 | [diff] [blame] | 4186 | } |
| 4187 | |
| 4188 | static struct shrinker mmu_shrinker = { |
| 4189 | .shrink = mmu_shrink, |
| 4190 | .seeks = DEFAULT_SEEKS * 10, |
| 4191 | }; |
| 4192 | |
Ingo Molnar | 2ddfd20 | 2008-05-22 10:37:48 +0200 | [diff] [blame] | 4193 | static void mmu_destroy_caches(void) |
Avi Kivity | b5a33a7 | 2007-04-15 16:31:09 +0300 | [diff] [blame] | 4194 | { |
Xiao Guangrong | 53c07b1 | 2011-05-15 23:26:20 +0800 | [diff] [blame] | 4195 | if (pte_list_desc_cache) |
| 4196 | kmem_cache_destroy(pte_list_desc_cache); |
Avi Kivity | d3d25b0 | 2007-05-30 12:34:53 +0300 | [diff] [blame] | 4197 | if (mmu_page_header_cache) |
| 4198 | kmem_cache_destroy(mmu_page_header_cache); |
Avi Kivity | b5a33a7 | 2007-04-15 16:31:09 +0300 | [diff] [blame] | 4199 | } |
| 4200 | |
| 4201 | int kvm_mmu_module_init(void) |
| 4202 | { |
Xiao Guangrong | 53c07b1 | 2011-05-15 23:26:20 +0800 | [diff] [blame] | 4203 | pte_list_desc_cache = kmem_cache_create("pte_list_desc", |
| 4204 | sizeof(struct pte_list_desc), |
Paul Mundt | 20c2df8 | 2007-07-20 10:11:58 +0900 | [diff] [blame] | 4205 | 0, 0, NULL); |
Xiao Guangrong | 53c07b1 | 2011-05-15 23:26:20 +0800 | [diff] [blame] | 4206 | if (!pte_list_desc_cache) |
Avi Kivity | b5a33a7 | 2007-04-15 16:31:09 +0300 | [diff] [blame] | 4207 | goto nomem; |
| 4208 | |
Avi Kivity | d3d25b0 | 2007-05-30 12:34:53 +0300 | [diff] [blame] | 4209 | mmu_page_header_cache = kmem_cache_create("kvm_mmu_page_header", |
| 4210 | sizeof(struct kvm_mmu_page), |
Paul Mundt | 20c2df8 | 2007-07-20 10:11:58 +0900 | [diff] [blame] | 4211 | 0, 0, NULL); |
Avi Kivity | d3d25b0 | 2007-05-30 12:34:53 +0300 | [diff] [blame] | 4212 | if (!mmu_page_header_cache) |
| 4213 | goto nomem; |
| 4214 | |
Wei Yongjun | 45bf21a | 2010-08-23 16:13:15 +0800 | [diff] [blame] | 4215 | if (percpu_counter_init(&kvm_total_used_mmu_pages, 0)) |
| 4216 | goto nomem; |
| 4217 | |
Izik Eidus | 3ee16c8 | 2008-03-30 15:17:21 +0300 | [diff] [blame] | 4218 | register_shrinker(&mmu_shrinker); |
| 4219 | |
Avi Kivity | b5a33a7 | 2007-04-15 16:31:09 +0300 | [diff] [blame] | 4220 | return 0; |
| 4221 | |
| 4222 | nomem: |
Izik Eidus | 3ee16c8 | 2008-03-30 15:17:21 +0300 | [diff] [blame] | 4223 | mmu_destroy_caches(); |
Avi Kivity | b5a33a7 | 2007-04-15 16:31:09 +0300 | [diff] [blame] | 4224 | return -ENOMEM; |
| 4225 | } |
| 4226 | |
Zhang Xiantao | 3ad82a7 | 2007-11-20 13:11:38 +0800 | [diff] [blame] | 4227 | /* |
| 4228 | * Caculate mmu pages needed for kvm. |
| 4229 | */ |
| 4230 | unsigned int kvm_mmu_calculate_mmu_pages(struct kvm *kvm) |
| 4231 | { |
Zhang Xiantao | 3ad82a7 | 2007-11-20 13:11:38 +0800 | [diff] [blame] | 4232 | unsigned int nr_mmu_pages; |
| 4233 | unsigned int nr_pages = 0; |
Marcelo Tosatti | bc6678a | 2009-12-23 14:35:21 -0200 | [diff] [blame] | 4234 | struct kvm_memslots *slots; |
Xiao Guangrong | be6ba0f | 2011-11-24 17:39:18 +0800 | [diff] [blame] | 4235 | struct kvm_memory_slot *memslot; |
Zhang Xiantao | 3ad82a7 | 2007-11-20 13:11:38 +0800 | [diff] [blame] | 4236 | |
Lai Jiangshan | 90d83dc | 2010-04-19 17:41:23 +0800 | [diff] [blame] | 4237 | slots = kvm_memslots(kvm); |
| 4238 | |
Xiao Guangrong | be6ba0f | 2011-11-24 17:39:18 +0800 | [diff] [blame] | 4239 | kvm_for_each_memslot(memslot, slots) |
| 4240 | nr_pages += memslot->npages; |
Zhang Xiantao | 3ad82a7 | 2007-11-20 13:11:38 +0800 | [diff] [blame] | 4241 | |
| 4242 | nr_mmu_pages = nr_pages * KVM_PERMILLE_MMU_PAGES / 1000; |
| 4243 | nr_mmu_pages = max(nr_mmu_pages, |
| 4244 | (unsigned int) KVM_MIN_ALLOC_MMU_PAGES); |
| 4245 | |
| 4246 | return nr_mmu_pages; |
| 4247 | } |
| 4248 | |
Marcelo Tosatti | 94d8b05 | 2009-06-11 12:07:42 -0300 | [diff] [blame] | 4249 | int kvm_mmu_get_spte_hierarchy(struct kvm_vcpu *vcpu, u64 addr, u64 sptes[4]) |
| 4250 | { |
| 4251 | struct kvm_shadow_walk_iterator iterator; |
Xiao Guangrong | c2a2ac2 | 2011-07-12 03:32:13 +0800 | [diff] [blame] | 4252 | u64 spte; |
Marcelo Tosatti | 94d8b05 | 2009-06-11 12:07:42 -0300 | [diff] [blame] | 4253 | int nr_sptes = 0; |
| 4254 | |
Xiao Guangrong | c2a2ac2 | 2011-07-12 03:32:13 +0800 | [diff] [blame] | 4255 | walk_shadow_page_lockless_begin(vcpu); |
| 4256 | for_each_shadow_entry_lockless(vcpu, addr, iterator, spte) { |
| 4257 | sptes[iterator.level-1] = spte; |
Marcelo Tosatti | 94d8b05 | 2009-06-11 12:07:42 -0300 | [diff] [blame] | 4258 | nr_sptes++; |
Xiao Guangrong | c2a2ac2 | 2011-07-12 03:32:13 +0800 | [diff] [blame] | 4259 | if (!is_shadow_present_pte(spte)) |
Marcelo Tosatti | 94d8b05 | 2009-06-11 12:07:42 -0300 | [diff] [blame] | 4260 | break; |
| 4261 | } |
Xiao Guangrong | c2a2ac2 | 2011-07-12 03:32:13 +0800 | [diff] [blame] | 4262 | walk_shadow_page_lockless_end(vcpu); |
Marcelo Tosatti | 94d8b05 | 2009-06-11 12:07:42 -0300 | [diff] [blame] | 4263 | |
| 4264 | return nr_sptes; |
| 4265 | } |
| 4266 | EXPORT_SYMBOL_GPL(kvm_mmu_get_spte_hierarchy); |
| 4267 | |
Xiao Guangrong | c42fffe | 2010-09-27 18:07:07 +0800 | [diff] [blame] | 4268 | void kvm_mmu_destroy(struct kvm_vcpu *vcpu) |
| 4269 | { |
| 4270 | ASSERT(vcpu); |
| 4271 | |
| 4272 | destroy_kvm_mmu(vcpu); |
| 4273 | free_mmu_pages(vcpu); |
| 4274 | mmu_free_memory_caches(vcpu); |
Xiao Guangrong | b034cf0 | 2010-12-23 16:08:35 +0800 | [diff] [blame] | 4275 | } |
| 4276 | |
Xiao Guangrong | b034cf0 | 2010-12-23 16:08:35 +0800 | [diff] [blame] | 4277 | void kvm_mmu_module_exit(void) |
| 4278 | { |
| 4279 | mmu_destroy_caches(); |
| 4280 | percpu_counter_destroy(&kvm_total_used_mmu_pages); |
| 4281 | unregister_shrinker(&mmu_shrinker); |
Xiao Guangrong | c42fffe | 2010-09-27 18:07:07 +0800 | [diff] [blame] | 4282 | mmu_audit_disable(); |
| 4283 | } |