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. |
| 10 | * |
| 11 | * Authors: |
| 12 | * Yaniv Kamay <yaniv@qumranet.com> |
| 13 | * Avi Kivity <avi@qumranet.com> |
| 14 | * |
| 15 | * This work is licensed under the terms of the GNU GPL, version 2. See |
| 16 | * the COPYING file in the top-level directory. |
| 17 | * |
| 18 | */ |
| 19 | #include <linux/types.h> |
| 20 | #include <linux/string.h> |
| 21 | #include <asm/page.h> |
| 22 | #include <linux/mm.h> |
| 23 | #include <linux/highmem.h> |
| 24 | #include <linux/module.h> |
| 25 | |
| 26 | #include "vmx.h" |
| 27 | #include "kvm.h" |
| 28 | |
Avi Kivity | 37a7d8b | 2007-01-05 16:36:56 -0800 | [diff] [blame] | 29 | #undef MMU_DEBUG |
| 30 | |
| 31 | #undef AUDIT |
| 32 | |
| 33 | #ifdef AUDIT |
| 34 | static void kvm_mmu_audit(struct kvm_vcpu *vcpu, const char *msg); |
| 35 | #else |
| 36 | static void kvm_mmu_audit(struct kvm_vcpu *vcpu, const char *msg) {} |
| 37 | #endif |
| 38 | |
| 39 | #ifdef MMU_DEBUG |
| 40 | |
| 41 | #define pgprintk(x...) do { if (dbg) printk(x); } while (0) |
| 42 | #define rmap_printk(x...) do { if (dbg) printk(x); } while (0) |
| 43 | |
| 44 | #else |
| 45 | |
| 46 | #define pgprintk(x...) do { } while (0) |
| 47 | #define rmap_printk(x...) do { } while (0) |
| 48 | |
| 49 | #endif |
| 50 | |
| 51 | #if defined(MMU_DEBUG) || defined(AUDIT) |
| 52 | static int dbg = 1; |
| 53 | #endif |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 54 | |
| 55 | #define ASSERT(x) \ |
| 56 | if (!(x)) { \ |
| 57 | printk(KERN_WARNING "assertion failed %s:%d: %s\n", \ |
| 58 | __FILE__, __LINE__, #x); \ |
| 59 | } |
| 60 | |
Avi Kivity | cea0f0e | 2007-01-05 16:36:43 -0800 | [diff] [blame] | 61 | #define PT64_PT_BITS 9 |
| 62 | #define PT64_ENT_PER_PAGE (1 << PT64_PT_BITS) |
| 63 | #define PT32_PT_BITS 10 |
| 64 | #define PT32_ENT_PER_PAGE (1 << PT32_PT_BITS) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 65 | |
| 66 | #define PT_WRITABLE_SHIFT 1 |
| 67 | |
| 68 | #define PT_PRESENT_MASK (1ULL << 0) |
| 69 | #define PT_WRITABLE_MASK (1ULL << PT_WRITABLE_SHIFT) |
| 70 | #define PT_USER_MASK (1ULL << 2) |
| 71 | #define PT_PWT_MASK (1ULL << 3) |
| 72 | #define PT_PCD_MASK (1ULL << 4) |
| 73 | #define PT_ACCESSED_MASK (1ULL << 5) |
| 74 | #define PT_DIRTY_MASK (1ULL << 6) |
| 75 | #define PT_PAGE_SIZE_MASK (1ULL << 7) |
| 76 | #define PT_PAT_MASK (1ULL << 7) |
| 77 | #define PT_GLOBAL_MASK (1ULL << 8) |
| 78 | #define PT64_NX_MASK (1ULL << 63) |
| 79 | |
| 80 | #define PT_PAT_SHIFT 7 |
| 81 | #define PT_DIR_PAT_SHIFT 12 |
| 82 | #define PT_DIR_PAT_MASK (1ULL << PT_DIR_PAT_SHIFT) |
| 83 | |
| 84 | #define PT32_DIR_PSE36_SIZE 4 |
| 85 | #define PT32_DIR_PSE36_SHIFT 13 |
| 86 | #define PT32_DIR_PSE36_MASK (((1ULL << PT32_DIR_PSE36_SIZE) - 1) << PT32_DIR_PSE36_SHIFT) |
| 87 | |
| 88 | |
| 89 | #define PT32_PTE_COPY_MASK \ |
Avi Kivity | 8c7bb72 | 2006-12-13 00:34:02 -0800 | [diff] [blame] | 90 | (PT_PRESENT_MASK | PT_ACCESSED_MASK | PT_DIRTY_MASK | PT_GLOBAL_MASK) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 91 | |
Avi Kivity | 8c7bb72 | 2006-12-13 00:34:02 -0800 | [diff] [blame] | 92 | #define PT64_PTE_COPY_MASK (PT64_NX_MASK | PT32_PTE_COPY_MASK) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 93 | |
| 94 | #define PT_FIRST_AVAIL_BITS_SHIFT 9 |
| 95 | #define PT64_SECOND_AVAIL_BITS_SHIFT 52 |
| 96 | |
| 97 | #define PT_SHADOW_PS_MARK (1ULL << PT_FIRST_AVAIL_BITS_SHIFT) |
| 98 | #define PT_SHADOW_IO_MARK (1ULL << PT_FIRST_AVAIL_BITS_SHIFT) |
| 99 | |
| 100 | #define PT_SHADOW_WRITABLE_SHIFT (PT_FIRST_AVAIL_BITS_SHIFT + 1) |
| 101 | #define PT_SHADOW_WRITABLE_MASK (1ULL << PT_SHADOW_WRITABLE_SHIFT) |
| 102 | |
| 103 | #define PT_SHADOW_USER_SHIFT (PT_SHADOW_WRITABLE_SHIFT + 1) |
| 104 | #define PT_SHADOW_USER_MASK (1ULL << (PT_SHADOW_USER_SHIFT)) |
| 105 | |
| 106 | #define PT_SHADOW_BITS_OFFSET (PT_SHADOW_WRITABLE_SHIFT - PT_WRITABLE_SHIFT) |
| 107 | |
| 108 | #define VALID_PAGE(x) ((x) != INVALID_PAGE) |
| 109 | |
| 110 | #define PT64_LEVEL_BITS 9 |
| 111 | |
| 112 | #define PT64_LEVEL_SHIFT(level) \ |
| 113 | ( PAGE_SHIFT + (level - 1) * PT64_LEVEL_BITS ) |
| 114 | |
| 115 | #define PT64_LEVEL_MASK(level) \ |
| 116 | (((1ULL << PT64_LEVEL_BITS) - 1) << PT64_LEVEL_SHIFT(level)) |
| 117 | |
| 118 | #define PT64_INDEX(address, level)\ |
| 119 | (((address) >> PT64_LEVEL_SHIFT(level)) & ((1 << PT64_LEVEL_BITS) - 1)) |
| 120 | |
| 121 | |
| 122 | #define PT32_LEVEL_BITS 10 |
| 123 | |
| 124 | #define PT32_LEVEL_SHIFT(level) \ |
| 125 | ( PAGE_SHIFT + (level - 1) * PT32_LEVEL_BITS ) |
| 126 | |
| 127 | #define PT32_LEVEL_MASK(level) \ |
| 128 | (((1ULL << PT32_LEVEL_BITS) - 1) << PT32_LEVEL_SHIFT(level)) |
| 129 | |
| 130 | #define PT32_INDEX(address, level)\ |
| 131 | (((address) >> PT32_LEVEL_SHIFT(level)) & ((1 << PT32_LEVEL_BITS) - 1)) |
| 132 | |
| 133 | |
| 134 | #define PT64_BASE_ADDR_MASK (((1ULL << 52) - 1) & PAGE_MASK) |
| 135 | #define PT64_DIR_BASE_ADDR_MASK \ |
| 136 | (PT64_BASE_ADDR_MASK & ~((1ULL << (PAGE_SHIFT + PT64_LEVEL_BITS)) - 1)) |
| 137 | |
| 138 | #define PT32_BASE_ADDR_MASK PAGE_MASK |
| 139 | #define PT32_DIR_BASE_ADDR_MASK \ |
| 140 | (PAGE_MASK & ~((1ULL << (PAGE_SHIFT + PT32_LEVEL_BITS)) - 1)) |
| 141 | |
| 142 | |
| 143 | #define PFERR_PRESENT_MASK (1U << 0) |
| 144 | #define PFERR_WRITE_MASK (1U << 1) |
| 145 | #define PFERR_USER_MASK (1U << 2) |
| 146 | |
| 147 | #define PT64_ROOT_LEVEL 4 |
| 148 | #define PT32_ROOT_LEVEL 2 |
| 149 | #define PT32E_ROOT_LEVEL 3 |
| 150 | |
| 151 | #define PT_DIRECTORY_LEVEL 2 |
| 152 | #define PT_PAGE_TABLE_LEVEL 1 |
| 153 | |
Avi Kivity | cd4a4e5 | 2007-01-05 16:36:38 -0800 | [diff] [blame] | 154 | #define RMAP_EXT 4 |
| 155 | |
| 156 | struct kvm_rmap_desc { |
| 157 | u64 *shadow_ptes[RMAP_EXT]; |
| 158 | struct kvm_rmap_desc *more; |
| 159 | }; |
| 160 | |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 161 | static int is_write_protection(struct kvm_vcpu *vcpu) |
| 162 | { |
| 163 | return vcpu->cr0 & CR0_WP_MASK; |
| 164 | } |
| 165 | |
| 166 | static int is_cpuid_PSE36(void) |
| 167 | { |
| 168 | return 1; |
| 169 | } |
| 170 | |
| 171 | static int is_present_pte(unsigned long pte) |
| 172 | { |
| 173 | return pte & PT_PRESENT_MASK; |
| 174 | } |
| 175 | |
| 176 | static int is_writeble_pte(unsigned long pte) |
| 177 | { |
| 178 | return pte & PT_WRITABLE_MASK; |
| 179 | } |
| 180 | |
| 181 | static int is_io_pte(unsigned long pte) |
| 182 | { |
| 183 | return pte & PT_SHADOW_IO_MARK; |
| 184 | } |
| 185 | |
Avi Kivity | cd4a4e5 | 2007-01-05 16:36:38 -0800 | [diff] [blame] | 186 | static int is_rmap_pte(u64 pte) |
| 187 | { |
| 188 | return (pte & (PT_WRITABLE_MASK | PT_PRESENT_MASK)) |
| 189 | == (PT_WRITABLE_MASK | PT_PRESENT_MASK); |
| 190 | } |
| 191 | |
Avi Kivity | e2dec93 | 2007-01-05 16:36:54 -0800 | [diff] [blame] | 192 | static int mmu_topup_memory_cache(struct kvm_mmu_memory_cache *cache, |
| 193 | size_t objsize, int min) |
Avi Kivity | 714b93d | 2007-01-05 16:36:53 -0800 | [diff] [blame] | 194 | { |
| 195 | void *obj; |
| 196 | |
| 197 | if (cache->nobjs >= min) |
Avi Kivity | e2dec93 | 2007-01-05 16:36:54 -0800 | [diff] [blame] | 198 | return 0; |
Avi Kivity | 714b93d | 2007-01-05 16:36:53 -0800 | [diff] [blame] | 199 | while (cache->nobjs < ARRAY_SIZE(cache->objects)) { |
| 200 | obj = kzalloc(objsize, GFP_NOWAIT); |
| 201 | if (!obj) |
Avi Kivity | e2dec93 | 2007-01-05 16:36:54 -0800 | [diff] [blame] | 202 | return -ENOMEM; |
Avi Kivity | 714b93d | 2007-01-05 16:36:53 -0800 | [diff] [blame] | 203 | cache->objects[cache->nobjs++] = obj; |
| 204 | } |
Avi Kivity | e2dec93 | 2007-01-05 16:36:54 -0800 | [diff] [blame] | 205 | return 0; |
Avi Kivity | 714b93d | 2007-01-05 16:36:53 -0800 | [diff] [blame] | 206 | } |
| 207 | |
| 208 | static void mmu_free_memory_cache(struct kvm_mmu_memory_cache *mc) |
| 209 | { |
| 210 | while (mc->nobjs) |
| 211 | kfree(mc->objects[--mc->nobjs]); |
| 212 | } |
| 213 | |
Avi Kivity | e2dec93 | 2007-01-05 16:36:54 -0800 | [diff] [blame] | 214 | static int mmu_topup_memory_caches(struct kvm_vcpu *vcpu) |
Avi Kivity | 714b93d | 2007-01-05 16:36:53 -0800 | [diff] [blame] | 215 | { |
Avi Kivity | e2dec93 | 2007-01-05 16:36:54 -0800 | [diff] [blame] | 216 | int r; |
| 217 | |
| 218 | r = mmu_topup_memory_cache(&vcpu->mmu_pte_chain_cache, |
| 219 | sizeof(struct kvm_pte_chain), 4); |
| 220 | if (r) |
| 221 | goto out; |
| 222 | r = mmu_topup_memory_cache(&vcpu->mmu_rmap_desc_cache, |
| 223 | sizeof(struct kvm_rmap_desc), 1); |
| 224 | out: |
| 225 | return r; |
Avi Kivity | 714b93d | 2007-01-05 16:36:53 -0800 | [diff] [blame] | 226 | } |
| 227 | |
| 228 | static void mmu_free_memory_caches(struct kvm_vcpu *vcpu) |
| 229 | { |
| 230 | mmu_free_memory_cache(&vcpu->mmu_pte_chain_cache); |
| 231 | mmu_free_memory_cache(&vcpu->mmu_rmap_desc_cache); |
| 232 | } |
| 233 | |
| 234 | static void *mmu_memory_cache_alloc(struct kvm_mmu_memory_cache *mc, |
| 235 | size_t size) |
| 236 | { |
| 237 | void *p; |
| 238 | |
| 239 | BUG_ON(!mc->nobjs); |
| 240 | p = mc->objects[--mc->nobjs]; |
| 241 | memset(p, 0, size); |
| 242 | return p; |
| 243 | } |
| 244 | |
| 245 | static void mmu_memory_cache_free(struct kvm_mmu_memory_cache *mc, void *obj) |
| 246 | { |
| 247 | if (mc->nobjs < KVM_NR_MEM_OBJS) |
| 248 | mc->objects[mc->nobjs++] = obj; |
| 249 | else |
| 250 | kfree(obj); |
| 251 | } |
| 252 | |
| 253 | static struct kvm_pte_chain *mmu_alloc_pte_chain(struct kvm_vcpu *vcpu) |
| 254 | { |
| 255 | return mmu_memory_cache_alloc(&vcpu->mmu_pte_chain_cache, |
| 256 | sizeof(struct kvm_pte_chain)); |
| 257 | } |
| 258 | |
| 259 | static void mmu_free_pte_chain(struct kvm_vcpu *vcpu, |
| 260 | struct kvm_pte_chain *pc) |
| 261 | { |
| 262 | mmu_memory_cache_free(&vcpu->mmu_pte_chain_cache, pc); |
| 263 | } |
| 264 | |
| 265 | static struct kvm_rmap_desc *mmu_alloc_rmap_desc(struct kvm_vcpu *vcpu) |
| 266 | { |
| 267 | return mmu_memory_cache_alloc(&vcpu->mmu_rmap_desc_cache, |
| 268 | sizeof(struct kvm_rmap_desc)); |
| 269 | } |
| 270 | |
| 271 | static void mmu_free_rmap_desc(struct kvm_vcpu *vcpu, |
| 272 | struct kvm_rmap_desc *rd) |
| 273 | { |
| 274 | mmu_memory_cache_free(&vcpu->mmu_rmap_desc_cache, rd); |
| 275 | } |
| 276 | |
Avi Kivity | cd4a4e5 | 2007-01-05 16:36:38 -0800 | [diff] [blame] | 277 | /* |
| 278 | * Reverse mapping data structures: |
| 279 | * |
| 280 | * If page->private bit zero is zero, then page->private points to the |
| 281 | * shadow page table entry that points to page_address(page). |
| 282 | * |
| 283 | * If page->private bit zero is one, (then page->private & ~1) points |
| 284 | * to a struct kvm_rmap_desc containing more mappings. |
| 285 | */ |
Avi Kivity | 714b93d | 2007-01-05 16:36:53 -0800 | [diff] [blame] | 286 | static void rmap_add(struct kvm_vcpu *vcpu, u64 *spte) |
Avi Kivity | cd4a4e5 | 2007-01-05 16:36:38 -0800 | [diff] [blame] | 287 | { |
| 288 | struct page *page; |
| 289 | struct kvm_rmap_desc *desc; |
| 290 | int i; |
| 291 | |
| 292 | if (!is_rmap_pte(*spte)) |
| 293 | return; |
| 294 | page = pfn_to_page((*spte & PT64_BASE_ADDR_MASK) >> PAGE_SHIFT); |
| 295 | if (!page->private) { |
| 296 | rmap_printk("rmap_add: %p %llx 0->1\n", spte, *spte); |
| 297 | page->private = (unsigned long)spte; |
| 298 | } else if (!(page->private & 1)) { |
| 299 | rmap_printk("rmap_add: %p %llx 1->many\n", spte, *spte); |
Avi Kivity | 714b93d | 2007-01-05 16:36:53 -0800 | [diff] [blame] | 300 | desc = mmu_alloc_rmap_desc(vcpu); |
Avi Kivity | cd4a4e5 | 2007-01-05 16:36:38 -0800 | [diff] [blame] | 301 | desc->shadow_ptes[0] = (u64 *)page->private; |
| 302 | desc->shadow_ptes[1] = spte; |
| 303 | page->private = (unsigned long)desc | 1; |
| 304 | } else { |
| 305 | rmap_printk("rmap_add: %p %llx many->many\n", spte, *spte); |
| 306 | desc = (struct kvm_rmap_desc *)(page->private & ~1ul); |
| 307 | while (desc->shadow_ptes[RMAP_EXT-1] && desc->more) |
| 308 | desc = desc->more; |
| 309 | if (desc->shadow_ptes[RMAP_EXT-1]) { |
Avi Kivity | 714b93d | 2007-01-05 16:36:53 -0800 | [diff] [blame] | 310 | desc->more = mmu_alloc_rmap_desc(vcpu); |
Avi Kivity | cd4a4e5 | 2007-01-05 16:36:38 -0800 | [diff] [blame] | 311 | desc = desc->more; |
| 312 | } |
| 313 | for (i = 0; desc->shadow_ptes[i]; ++i) |
| 314 | ; |
| 315 | desc->shadow_ptes[i] = spte; |
| 316 | } |
| 317 | } |
| 318 | |
Avi Kivity | 714b93d | 2007-01-05 16:36:53 -0800 | [diff] [blame] | 319 | static void rmap_desc_remove_entry(struct kvm_vcpu *vcpu, |
| 320 | struct page *page, |
Avi Kivity | cd4a4e5 | 2007-01-05 16:36:38 -0800 | [diff] [blame] | 321 | struct kvm_rmap_desc *desc, |
| 322 | int i, |
| 323 | struct kvm_rmap_desc *prev_desc) |
| 324 | { |
| 325 | int j; |
| 326 | |
| 327 | for (j = RMAP_EXT - 1; !desc->shadow_ptes[j] && j > i; --j) |
| 328 | ; |
| 329 | desc->shadow_ptes[i] = desc->shadow_ptes[j]; |
| 330 | desc->shadow_ptes[j] = 0; |
| 331 | if (j != 0) |
| 332 | return; |
| 333 | if (!prev_desc && !desc->more) |
| 334 | page->private = (unsigned long)desc->shadow_ptes[0]; |
| 335 | else |
| 336 | if (prev_desc) |
| 337 | prev_desc->more = desc->more; |
| 338 | else |
| 339 | page->private = (unsigned long)desc->more | 1; |
Avi Kivity | 714b93d | 2007-01-05 16:36:53 -0800 | [diff] [blame] | 340 | mmu_free_rmap_desc(vcpu, desc); |
Avi Kivity | cd4a4e5 | 2007-01-05 16:36:38 -0800 | [diff] [blame] | 341 | } |
| 342 | |
Avi Kivity | 714b93d | 2007-01-05 16:36:53 -0800 | [diff] [blame] | 343 | static void rmap_remove(struct kvm_vcpu *vcpu, u64 *spte) |
Avi Kivity | cd4a4e5 | 2007-01-05 16:36:38 -0800 | [diff] [blame] | 344 | { |
| 345 | struct page *page; |
| 346 | struct kvm_rmap_desc *desc; |
| 347 | struct kvm_rmap_desc *prev_desc; |
| 348 | int i; |
| 349 | |
| 350 | if (!is_rmap_pte(*spte)) |
| 351 | return; |
| 352 | page = pfn_to_page((*spte & PT64_BASE_ADDR_MASK) >> PAGE_SHIFT); |
| 353 | if (!page->private) { |
| 354 | printk(KERN_ERR "rmap_remove: %p %llx 0->BUG\n", spte, *spte); |
| 355 | BUG(); |
| 356 | } else if (!(page->private & 1)) { |
| 357 | rmap_printk("rmap_remove: %p %llx 1->0\n", spte, *spte); |
| 358 | if ((u64 *)page->private != spte) { |
| 359 | printk(KERN_ERR "rmap_remove: %p %llx 1->BUG\n", |
| 360 | spte, *spte); |
| 361 | BUG(); |
| 362 | } |
| 363 | page->private = 0; |
| 364 | } else { |
| 365 | rmap_printk("rmap_remove: %p %llx many->many\n", spte, *spte); |
| 366 | desc = (struct kvm_rmap_desc *)(page->private & ~1ul); |
| 367 | prev_desc = NULL; |
| 368 | while (desc) { |
| 369 | for (i = 0; i < RMAP_EXT && desc->shadow_ptes[i]; ++i) |
| 370 | if (desc->shadow_ptes[i] == spte) { |
Avi Kivity | 714b93d | 2007-01-05 16:36:53 -0800 | [diff] [blame] | 371 | rmap_desc_remove_entry(vcpu, page, |
| 372 | desc, i, |
Avi Kivity | cd4a4e5 | 2007-01-05 16:36:38 -0800 | [diff] [blame] | 373 | prev_desc); |
| 374 | return; |
| 375 | } |
| 376 | prev_desc = desc; |
| 377 | desc = desc->more; |
| 378 | } |
| 379 | BUG(); |
| 380 | } |
| 381 | } |
| 382 | |
Avi Kivity | 714b93d | 2007-01-05 16:36:53 -0800 | [diff] [blame] | 383 | static void rmap_write_protect(struct kvm_vcpu *vcpu, u64 gfn) |
Avi Kivity | 374cbac | 2007-01-05 16:36:43 -0800 | [diff] [blame] | 384 | { |
Avi Kivity | 714b93d | 2007-01-05 16:36:53 -0800 | [diff] [blame] | 385 | struct kvm *kvm = vcpu->kvm; |
Avi Kivity | 374cbac | 2007-01-05 16:36:43 -0800 | [diff] [blame] | 386 | struct page *page; |
| 387 | struct kvm_memory_slot *slot; |
| 388 | struct kvm_rmap_desc *desc; |
| 389 | u64 *spte; |
| 390 | |
| 391 | slot = gfn_to_memslot(kvm, gfn); |
| 392 | BUG_ON(!slot); |
| 393 | page = gfn_to_page(slot, gfn); |
| 394 | |
| 395 | while (page->private) { |
| 396 | if (!(page->private & 1)) |
| 397 | spte = (u64 *)page->private; |
| 398 | else { |
| 399 | desc = (struct kvm_rmap_desc *)(page->private & ~1ul); |
| 400 | spte = desc->shadow_ptes[0]; |
| 401 | } |
| 402 | BUG_ON(!spte); |
| 403 | BUG_ON((*spte & PT64_BASE_ADDR_MASK) != |
| 404 | page_to_pfn(page) << PAGE_SHIFT); |
| 405 | BUG_ON(!(*spte & PT_PRESENT_MASK)); |
| 406 | BUG_ON(!(*spte & PT_WRITABLE_MASK)); |
| 407 | rmap_printk("rmap_write_protect: spte %p %llx\n", spte, *spte); |
Avi Kivity | 714b93d | 2007-01-05 16:36:53 -0800 | [diff] [blame] | 408 | rmap_remove(vcpu, spte); |
Avi Kivity | 40907d5 | 2007-01-05 16:36:55 -0800 | [diff] [blame] | 409 | kvm_arch_ops->tlb_flush(vcpu); |
Avi Kivity | 374cbac | 2007-01-05 16:36:43 -0800 | [diff] [blame] | 410 | *spte &= ~(u64)PT_WRITABLE_MASK; |
| 411 | } |
| 412 | } |
| 413 | |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 414 | static int is_empty_shadow_page(hpa_t page_hpa) |
| 415 | { |
Avi Kivity | 139bdb2 | 2007-01-05 16:36:50 -0800 | [diff] [blame] | 416 | u64 *pos; |
| 417 | u64 *end; |
| 418 | |
| 419 | for (pos = __va(page_hpa), end = pos + PAGE_SIZE / sizeof(u64); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 420 | pos != end; pos++) |
Avi Kivity | 139bdb2 | 2007-01-05 16:36:50 -0800 | [diff] [blame] | 421 | if (*pos != 0) { |
| 422 | printk(KERN_ERR "%s: %p %llx\n", __FUNCTION__, |
| 423 | pos, *pos); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 424 | return 0; |
Avi Kivity | 139bdb2 | 2007-01-05 16:36:50 -0800 | [diff] [blame] | 425 | } |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 426 | return 1; |
| 427 | } |
| 428 | |
Avi Kivity | 260746c | 2007-01-05 16:36:49 -0800 | [diff] [blame] | 429 | static void kvm_mmu_free_page(struct kvm_vcpu *vcpu, hpa_t page_hpa) |
| 430 | { |
| 431 | struct kvm_mmu_page *page_head = page_header(page_hpa); |
| 432 | |
Avi Kivity | 5f1e0b6 | 2007-01-05 16:36:49 -0800 | [diff] [blame] | 433 | ASSERT(is_empty_shadow_page(page_hpa)); |
Avi Kivity | 260746c | 2007-01-05 16:36:49 -0800 | [diff] [blame] | 434 | list_del(&page_head->link); |
| 435 | page_head->page_hpa = page_hpa; |
| 436 | list_add(&page_head->link, &vcpu->free_pages); |
| 437 | ++vcpu->kvm->n_free_mmu_pages; |
| 438 | } |
| 439 | |
Avi Kivity | cea0f0e | 2007-01-05 16:36:43 -0800 | [diff] [blame] | 440 | static unsigned kvm_page_table_hashfn(gfn_t gfn) |
| 441 | { |
| 442 | return gfn; |
| 443 | } |
| 444 | |
Avi Kivity | 25c0de2 | 2007-01-05 16:36:42 -0800 | [diff] [blame] | 445 | static struct kvm_mmu_page *kvm_mmu_alloc_page(struct kvm_vcpu *vcpu, |
| 446 | u64 *parent_pte) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 447 | { |
| 448 | struct kvm_mmu_page *page; |
| 449 | |
| 450 | if (list_empty(&vcpu->free_pages)) |
Avi Kivity | 25c0de2 | 2007-01-05 16:36:42 -0800 | [diff] [blame] | 451 | return NULL; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 452 | |
| 453 | page = list_entry(vcpu->free_pages.next, struct kvm_mmu_page, link); |
| 454 | list_del(&page->link); |
| 455 | list_add(&page->link, &vcpu->kvm->active_mmu_pages); |
| 456 | ASSERT(is_empty_shadow_page(page->page_hpa)); |
| 457 | page->slot_bitmap = 0; |
| 458 | page->global = 1; |
Avi Kivity | cea0f0e | 2007-01-05 16:36:43 -0800 | [diff] [blame] | 459 | page->multimapped = 0; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 460 | page->parent_pte = parent_pte; |
Avi Kivity | ebeace8 | 2007-01-05 16:36:47 -0800 | [diff] [blame] | 461 | --vcpu->kvm->n_free_mmu_pages; |
Avi Kivity | 25c0de2 | 2007-01-05 16:36:42 -0800 | [diff] [blame] | 462 | return page; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 463 | } |
| 464 | |
Avi Kivity | 714b93d | 2007-01-05 16:36:53 -0800 | [diff] [blame] | 465 | static void mmu_page_add_parent_pte(struct kvm_vcpu *vcpu, |
| 466 | struct kvm_mmu_page *page, u64 *parent_pte) |
Avi Kivity | cea0f0e | 2007-01-05 16:36:43 -0800 | [diff] [blame] | 467 | { |
| 468 | struct kvm_pte_chain *pte_chain; |
| 469 | struct hlist_node *node; |
| 470 | int i; |
| 471 | |
| 472 | if (!parent_pte) |
| 473 | return; |
| 474 | if (!page->multimapped) { |
| 475 | u64 *old = page->parent_pte; |
| 476 | |
| 477 | if (!old) { |
| 478 | page->parent_pte = parent_pte; |
| 479 | return; |
| 480 | } |
| 481 | page->multimapped = 1; |
Avi Kivity | 714b93d | 2007-01-05 16:36:53 -0800 | [diff] [blame] | 482 | pte_chain = mmu_alloc_pte_chain(vcpu); |
Avi Kivity | cea0f0e | 2007-01-05 16:36:43 -0800 | [diff] [blame] | 483 | INIT_HLIST_HEAD(&page->parent_ptes); |
| 484 | hlist_add_head(&pte_chain->link, &page->parent_ptes); |
| 485 | pte_chain->parent_ptes[0] = old; |
| 486 | } |
| 487 | hlist_for_each_entry(pte_chain, node, &page->parent_ptes, link) { |
| 488 | if (pte_chain->parent_ptes[NR_PTE_CHAIN_ENTRIES-1]) |
| 489 | continue; |
| 490 | for (i = 0; i < NR_PTE_CHAIN_ENTRIES; ++i) |
| 491 | if (!pte_chain->parent_ptes[i]) { |
| 492 | pte_chain->parent_ptes[i] = parent_pte; |
| 493 | return; |
| 494 | } |
| 495 | } |
Avi Kivity | 714b93d | 2007-01-05 16:36:53 -0800 | [diff] [blame] | 496 | pte_chain = mmu_alloc_pte_chain(vcpu); |
Avi Kivity | cea0f0e | 2007-01-05 16:36:43 -0800 | [diff] [blame] | 497 | BUG_ON(!pte_chain); |
| 498 | hlist_add_head(&pte_chain->link, &page->parent_ptes); |
| 499 | pte_chain->parent_ptes[0] = parent_pte; |
| 500 | } |
| 501 | |
Avi Kivity | 714b93d | 2007-01-05 16:36:53 -0800 | [diff] [blame] | 502 | static void mmu_page_remove_parent_pte(struct kvm_vcpu *vcpu, |
| 503 | struct kvm_mmu_page *page, |
Avi Kivity | cea0f0e | 2007-01-05 16:36:43 -0800 | [diff] [blame] | 504 | u64 *parent_pte) |
| 505 | { |
| 506 | struct kvm_pte_chain *pte_chain; |
| 507 | struct hlist_node *node; |
| 508 | int i; |
| 509 | |
| 510 | if (!page->multimapped) { |
| 511 | BUG_ON(page->parent_pte != parent_pte); |
| 512 | page->parent_pte = NULL; |
| 513 | return; |
| 514 | } |
| 515 | hlist_for_each_entry(pte_chain, node, &page->parent_ptes, link) |
| 516 | for (i = 0; i < NR_PTE_CHAIN_ENTRIES; ++i) { |
| 517 | if (!pte_chain->parent_ptes[i]) |
| 518 | break; |
| 519 | if (pte_chain->parent_ptes[i] != parent_pte) |
| 520 | continue; |
Avi Kivity | 697fe2e | 2007-01-05 16:36:46 -0800 | [diff] [blame] | 521 | while (i + 1 < NR_PTE_CHAIN_ENTRIES |
| 522 | && pte_chain->parent_ptes[i + 1]) { |
Avi Kivity | cea0f0e | 2007-01-05 16:36:43 -0800 | [diff] [blame] | 523 | pte_chain->parent_ptes[i] |
| 524 | = pte_chain->parent_ptes[i + 1]; |
| 525 | ++i; |
| 526 | } |
| 527 | pte_chain->parent_ptes[i] = NULL; |
Avi Kivity | 697fe2e | 2007-01-05 16:36:46 -0800 | [diff] [blame] | 528 | if (i == 0) { |
| 529 | hlist_del(&pte_chain->link); |
Avi Kivity | 714b93d | 2007-01-05 16:36:53 -0800 | [diff] [blame] | 530 | mmu_free_pte_chain(vcpu, pte_chain); |
Avi Kivity | 697fe2e | 2007-01-05 16:36:46 -0800 | [diff] [blame] | 531 | if (hlist_empty(&page->parent_ptes)) { |
| 532 | page->multimapped = 0; |
| 533 | page->parent_pte = NULL; |
| 534 | } |
| 535 | } |
Avi Kivity | cea0f0e | 2007-01-05 16:36:43 -0800 | [diff] [blame] | 536 | return; |
| 537 | } |
| 538 | BUG(); |
| 539 | } |
| 540 | |
| 541 | static struct kvm_mmu_page *kvm_mmu_lookup_page(struct kvm_vcpu *vcpu, |
| 542 | gfn_t gfn) |
| 543 | { |
| 544 | unsigned index; |
| 545 | struct hlist_head *bucket; |
| 546 | struct kvm_mmu_page *page; |
| 547 | struct hlist_node *node; |
| 548 | |
| 549 | pgprintk("%s: looking for gfn %lx\n", __FUNCTION__, gfn); |
| 550 | index = kvm_page_table_hashfn(gfn) % KVM_NUM_MMU_PAGES; |
| 551 | bucket = &vcpu->kvm->mmu_page_hash[index]; |
| 552 | hlist_for_each_entry(page, node, bucket, hash_link) |
| 553 | if (page->gfn == gfn && !page->role.metaphysical) { |
| 554 | pgprintk("%s: found role %x\n", |
| 555 | __FUNCTION__, page->role.word); |
| 556 | return page; |
| 557 | } |
| 558 | return NULL; |
| 559 | } |
| 560 | |
| 561 | static struct kvm_mmu_page *kvm_mmu_get_page(struct kvm_vcpu *vcpu, |
| 562 | gfn_t gfn, |
| 563 | gva_t gaddr, |
| 564 | unsigned level, |
| 565 | int metaphysical, |
| 566 | u64 *parent_pte) |
| 567 | { |
| 568 | union kvm_mmu_page_role role; |
| 569 | unsigned index; |
| 570 | unsigned quadrant; |
| 571 | struct hlist_head *bucket; |
| 572 | struct kvm_mmu_page *page; |
| 573 | struct hlist_node *node; |
| 574 | |
| 575 | role.word = 0; |
| 576 | role.glevels = vcpu->mmu.root_level; |
| 577 | role.level = level; |
| 578 | role.metaphysical = metaphysical; |
| 579 | if (vcpu->mmu.root_level <= PT32_ROOT_LEVEL) { |
| 580 | quadrant = gaddr >> (PAGE_SHIFT + (PT64_PT_BITS * level)); |
| 581 | quadrant &= (1 << ((PT32_PT_BITS - PT64_PT_BITS) * level)) - 1; |
| 582 | role.quadrant = quadrant; |
| 583 | } |
| 584 | pgprintk("%s: looking gfn %lx role %x\n", __FUNCTION__, |
| 585 | gfn, role.word); |
| 586 | index = kvm_page_table_hashfn(gfn) % KVM_NUM_MMU_PAGES; |
| 587 | bucket = &vcpu->kvm->mmu_page_hash[index]; |
| 588 | hlist_for_each_entry(page, node, bucket, hash_link) |
| 589 | if (page->gfn == gfn && page->role.word == role.word) { |
Avi Kivity | 714b93d | 2007-01-05 16:36:53 -0800 | [diff] [blame] | 590 | mmu_page_add_parent_pte(vcpu, page, parent_pte); |
Avi Kivity | cea0f0e | 2007-01-05 16:36:43 -0800 | [diff] [blame] | 591 | pgprintk("%s: found\n", __FUNCTION__); |
| 592 | return page; |
| 593 | } |
| 594 | page = kvm_mmu_alloc_page(vcpu, parent_pte); |
| 595 | if (!page) |
| 596 | return page; |
| 597 | pgprintk("%s: adding gfn %lx role %x\n", __FUNCTION__, gfn, role.word); |
| 598 | page->gfn = gfn; |
| 599 | page->role = role; |
| 600 | hlist_add_head(&page->hash_link, bucket); |
Avi Kivity | 374cbac | 2007-01-05 16:36:43 -0800 | [diff] [blame] | 601 | if (!metaphysical) |
Avi Kivity | 714b93d | 2007-01-05 16:36:53 -0800 | [diff] [blame] | 602 | rmap_write_protect(vcpu, gfn); |
Avi Kivity | cea0f0e | 2007-01-05 16:36:43 -0800 | [diff] [blame] | 603 | return page; |
| 604 | } |
| 605 | |
Avi Kivity | a436036 | 2007-01-05 16:36:45 -0800 | [diff] [blame] | 606 | static void kvm_mmu_page_unlink_children(struct kvm_vcpu *vcpu, |
| 607 | struct kvm_mmu_page *page) |
| 608 | { |
Avi Kivity | 697fe2e | 2007-01-05 16:36:46 -0800 | [diff] [blame] | 609 | unsigned i; |
| 610 | u64 *pt; |
| 611 | u64 ent; |
| 612 | |
| 613 | pt = __va(page->page_hpa); |
| 614 | |
| 615 | if (page->role.level == PT_PAGE_TABLE_LEVEL) { |
| 616 | for (i = 0; i < PT64_ENT_PER_PAGE; ++i) { |
| 617 | if (pt[i] & PT_PRESENT_MASK) |
Avi Kivity | 714b93d | 2007-01-05 16:36:53 -0800 | [diff] [blame] | 618 | rmap_remove(vcpu, &pt[i]); |
Avi Kivity | 697fe2e | 2007-01-05 16:36:46 -0800 | [diff] [blame] | 619 | pt[i] = 0; |
| 620 | } |
Avi Kivity | 40907d5 | 2007-01-05 16:36:55 -0800 | [diff] [blame] | 621 | kvm_arch_ops->tlb_flush(vcpu); |
Avi Kivity | 697fe2e | 2007-01-05 16:36:46 -0800 | [diff] [blame] | 622 | return; |
| 623 | } |
| 624 | |
| 625 | for (i = 0; i < PT64_ENT_PER_PAGE; ++i) { |
| 626 | ent = pt[i]; |
| 627 | |
| 628 | pt[i] = 0; |
| 629 | if (!(ent & PT_PRESENT_MASK)) |
| 630 | continue; |
| 631 | ent &= PT64_BASE_ADDR_MASK; |
Avi Kivity | 714b93d | 2007-01-05 16:36:53 -0800 | [diff] [blame] | 632 | mmu_page_remove_parent_pte(vcpu, page_header(ent), &pt[i]); |
Avi Kivity | 697fe2e | 2007-01-05 16:36:46 -0800 | [diff] [blame] | 633 | } |
Avi Kivity | a436036 | 2007-01-05 16:36:45 -0800 | [diff] [blame] | 634 | } |
| 635 | |
Avi Kivity | cea0f0e | 2007-01-05 16:36:43 -0800 | [diff] [blame] | 636 | static void kvm_mmu_put_page(struct kvm_vcpu *vcpu, |
| 637 | struct kvm_mmu_page *page, |
| 638 | u64 *parent_pte) |
| 639 | { |
Avi Kivity | 714b93d | 2007-01-05 16:36:53 -0800 | [diff] [blame] | 640 | mmu_page_remove_parent_pte(vcpu, page, parent_pte); |
Avi Kivity | a436036 | 2007-01-05 16:36:45 -0800 | [diff] [blame] | 641 | } |
| 642 | |
| 643 | static void kvm_mmu_zap_page(struct kvm_vcpu *vcpu, |
| 644 | struct kvm_mmu_page *page) |
| 645 | { |
| 646 | u64 *parent_pte; |
| 647 | |
| 648 | while (page->multimapped || page->parent_pte) { |
| 649 | if (!page->multimapped) |
| 650 | parent_pte = page->parent_pte; |
| 651 | else { |
| 652 | struct kvm_pte_chain *chain; |
| 653 | |
| 654 | chain = container_of(page->parent_ptes.first, |
| 655 | struct kvm_pte_chain, link); |
| 656 | parent_pte = chain->parent_ptes[0]; |
| 657 | } |
Avi Kivity | 697fe2e | 2007-01-05 16:36:46 -0800 | [diff] [blame] | 658 | BUG_ON(!parent_pte); |
Avi Kivity | a436036 | 2007-01-05 16:36:45 -0800 | [diff] [blame] | 659 | kvm_mmu_put_page(vcpu, page, parent_pte); |
| 660 | *parent_pte = 0; |
| 661 | } |
Avi Kivity | cc4529e | 2007-01-05 16:36:47 -0800 | [diff] [blame] | 662 | kvm_mmu_page_unlink_children(vcpu, page); |
Avi Kivity | 3bb65a2 | 2007-01-05 16:36:51 -0800 | [diff] [blame] | 663 | if (!page->root_count) { |
| 664 | hlist_del(&page->hash_link); |
| 665 | kvm_mmu_free_page(vcpu, page->page_hpa); |
| 666 | } else { |
| 667 | list_del(&page->link); |
| 668 | list_add(&page->link, &vcpu->kvm->active_mmu_pages); |
| 669 | } |
Avi Kivity | a436036 | 2007-01-05 16:36:45 -0800 | [diff] [blame] | 670 | } |
| 671 | |
| 672 | static int kvm_mmu_unprotect_page(struct kvm_vcpu *vcpu, gfn_t gfn) |
| 673 | { |
| 674 | unsigned index; |
| 675 | struct hlist_head *bucket; |
| 676 | struct kvm_mmu_page *page; |
| 677 | struct hlist_node *node, *n; |
| 678 | int r; |
| 679 | |
| 680 | pgprintk("%s: looking for gfn %lx\n", __FUNCTION__, gfn); |
| 681 | r = 0; |
| 682 | index = kvm_page_table_hashfn(gfn) % KVM_NUM_MMU_PAGES; |
| 683 | bucket = &vcpu->kvm->mmu_page_hash[index]; |
| 684 | hlist_for_each_entry_safe(page, node, n, bucket, hash_link) |
| 685 | if (page->gfn == gfn && !page->role.metaphysical) { |
Avi Kivity | 697fe2e | 2007-01-05 16:36:46 -0800 | [diff] [blame] | 686 | pgprintk("%s: gfn %lx role %x\n", __FUNCTION__, gfn, |
| 687 | page->role.word); |
Avi Kivity | a436036 | 2007-01-05 16:36:45 -0800 | [diff] [blame] | 688 | kvm_mmu_zap_page(vcpu, page); |
| 689 | r = 1; |
| 690 | } |
| 691 | return r; |
Avi Kivity | cea0f0e | 2007-01-05 16:36:43 -0800 | [diff] [blame] | 692 | } |
| 693 | |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 694 | static void page_header_update_slot(struct kvm *kvm, void *pte, gpa_t gpa) |
| 695 | { |
| 696 | int slot = memslot_id(kvm, gfn_to_memslot(kvm, gpa >> PAGE_SHIFT)); |
| 697 | struct kvm_mmu_page *page_head = page_header(__pa(pte)); |
| 698 | |
| 699 | __set_bit(slot, &page_head->slot_bitmap); |
| 700 | } |
| 701 | |
| 702 | hpa_t safe_gpa_to_hpa(struct kvm_vcpu *vcpu, gpa_t gpa) |
| 703 | { |
| 704 | hpa_t hpa = gpa_to_hpa(vcpu, gpa); |
| 705 | |
| 706 | return is_error_hpa(hpa) ? bad_page_address | (gpa & ~PAGE_MASK): hpa; |
| 707 | } |
| 708 | |
| 709 | hpa_t gpa_to_hpa(struct kvm_vcpu *vcpu, gpa_t gpa) |
| 710 | { |
| 711 | struct kvm_memory_slot *slot; |
| 712 | struct page *page; |
| 713 | |
| 714 | ASSERT((gpa & HPA_ERR_MASK) == 0); |
| 715 | slot = gfn_to_memslot(vcpu->kvm, gpa >> PAGE_SHIFT); |
| 716 | if (!slot) |
| 717 | return gpa | HPA_ERR_MASK; |
| 718 | page = gfn_to_page(slot, gpa >> PAGE_SHIFT); |
| 719 | return ((hpa_t)page_to_pfn(page) << PAGE_SHIFT) |
| 720 | | (gpa & (PAGE_SIZE-1)); |
| 721 | } |
| 722 | |
| 723 | hpa_t gva_to_hpa(struct kvm_vcpu *vcpu, gva_t gva) |
| 724 | { |
| 725 | gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, gva); |
| 726 | |
| 727 | if (gpa == UNMAPPED_GVA) |
| 728 | return UNMAPPED_GVA; |
| 729 | return gpa_to_hpa(vcpu, gpa); |
| 730 | } |
| 731 | |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 732 | static void nonpaging_new_cr3(struct kvm_vcpu *vcpu) |
| 733 | { |
| 734 | } |
| 735 | |
| 736 | static int nonpaging_map(struct kvm_vcpu *vcpu, gva_t v, hpa_t p) |
| 737 | { |
| 738 | int level = PT32E_ROOT_LEVEL; |
| 739 | hpa_t table_addr = vcpu->mmu.root_hpa; |
| 740 | |
| 741 | for (; ; level--) { |
| 742 | u32 index = PT64_INDEX(v, level); |
| 743 | u64 *table; |
Avi Kivity | cea0f0e | 2007-01-05 16:36:43 -0800 | [diff] [blame] | 744 | u64 pte; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 745 | |
| 746 | ASSERT(VALID_PAGE(table_addr)); |
| 747 | table = __va(table_addr); |
| 748 | |
| 749 | if (level == 1) { |
Avi Kivity | cea0f0e | 2007-01-05 16:36:43 -0800 | [diff] [blame] | 750 | pte = table[index]; |
| 751 | if (is_present_pte(pte) && is_writeble_pte(pte)) |
| 752 | return 0; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 753 | mark_page_dirty(vcpu->kvm, v >> PAGE_SHIFT); |
| 754 | page_header_update_slot(vcpu->kvm, table, v); |
| 755 | table[index] = p | PT_PRESENT_MASK | PT_WRITABLE_MASK | |
| 756 | PT_USER_MASK; |
Avi Kivity | 714b93d | 2007-01-05 16:36:53 -0800 | [diff] [blame] | 757 | rmap_add(vcpu, &table[index]); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 758 | return 0; |
| 759 | } |
| 760 | |
| 761 | if (table[index] == 0) { |
Avi Kivity | 25c0de2 | 2007-01-05 16:36:42 -0800 | [diff] [blame] | 762 | struct kvm_mmu_page *new_table; |
Avi Kivity | cea0f0e | 2007-01-05 16:36:43 -0800 | [diff] [blame] | 763 | gfn_t pseudo_gfn; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 764 | |
Avi Kivity | cea0f0e | 2007-01-05 16:36:43 -0800 | [diff] [blame] | 765 | pseudo_gfn = (v & PT64_DIR_BASE_ADDR_MASK) |
| 766 | >> PAGE_SHIFT; |
| 767 | new_table = kvm_mmu_get_page(vcpu, pseudo_gfn, |
| 768 | v, level - 1, |
| 769 | 1, &table[index]); |
Avi Kivity | 25c0de2 | 2007-01-05 16:36:42 -0800 | [diff] [blame] | 770 | if (!new_table) { |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 771 | pgprintk("nonpaging_map: ENOMEM\n"); |
| 772 | return -ENOMEM; |
| 773 | } |
| 774 | |
Avi Kivity | 25c0de2 | 2007-01-05 16:36:42 -0800 | [diff] [blame] | 775 | table[index] = new_table->page_hpa | PT_PRESENT_MASK |
| 776 | | PT_WRITABLE_MASK | PT_USER_MASK; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 777 | } |
| 778 | table_addr = table[index] & PT64_BASE_ADDR_MASK; |
| 779 | } |
| 780 | } |
| 781 | |
Avi Kivity | 17ac10a | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 782 | static void mmu_free_roots(struct kvm_vcpu *vcpu) |
| 783 | { |
| 784 | int i; |
Avi Kivity | 3bb65a2 | 2007-01-05 16:36:51 -0800 | [diff] [blame] | 785 | struct kvm_mmu_page *page; |
Avi Kivity | 17ac10a | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 786 | |
| 787 | #ifdef CONFIG_X86_64 |
| 788 | if (vcpu->mmu.shadow_root_level == PT64_ROOT_LEVEL) { |
| 789 | hpa_t root = vcpu->mmu.root_hpa; |
| 790 | |
| 791 | ASSERT(VALID_PAGE(root)); |
Avi Kivity | 3bb65a2 | 2007-01-05 16:36:51 -0800 | [diff] [blame] | 792 | page = page_header(root); |
| 793 | --page->root_count; |
Avi Kivity | 17ac10a | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 794 | vcpu->mmu.root_hpa = INVALID_PAGE; |
| 795 | return; |
| 796 | } |
| 797 | #endif |
| 798 | for (i = 0; i < 4; ++i) { |
| 799 | hpa_t root = vcpu->mmu.pae_root[i]; |
| 800 | |
| 801 | ASSERT(VALID_PAGE(root)); |
| 802 | root &= PT64_BASE_ADDR_MASK; |
Avi Kivity | 3bb65a2 | 2007-01-05 16:36:51 -0800 | [diff] [blame] | 803 | page = page_header(root); |
| 804 | --page->root_count; |
Avi Kivity | 17ac10a | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 805 | vcpu->mmu.pae_root[i] = INVALID_PAGE; |
| 806 | } |
| 807 | vcpu->mmu.root_hpa = INVALID_PAGE; |
| 808 | } |
| 809 | |
| 810 | static void mmu_alloc_roots(struct kvm_vcpu *vcpu) |
| 811 | { |
| 812 | int i; |
Avi Kivity | cea0f0e | 2007-01-05 16:36:43 -0800 | [diff] [blame] | 813 | gfn_t root_gfn; |
Avi Kivity | 3bb65a2 | 2007-01-05 16:36:51 -0800 | [diff] [blame] | 814 | struct kvm_mmu_page *page; |
| 815 | |
Avi Kivity | cea0f0e | 2007-01-05 16:36:43 -0800 | [diff] [blame] | 816 | root_gfn = vcpu->cr3 >> PAGE_SHIFT; |
Avi Kivity | 17ac10a | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 817 | |
| 818 | #ifdef CONFIG_X86_64 |
| 819 | if (vcpu->mmu.shadow_root_level == PT64_ROOT_LEVEL) { |
| 820 | hpa_t root = vcpu->mmu.root_hpa; |
| 821 | |
| 822 | ASSERT(!VALID_PAGE(root)); |
Ingo Molnar | 68a99f6 | 2007-01-05 16:36:59 -0800 | [diff] [blame^] | 823 | page = kvm_mmu_get_page(vcpu, root_gfn, 0, |
| 824 | PT64_ROOT_LEVEL, 0, NULL); |
| 825 | root = page->page_hpa; |
Avi Kivity | 3bb65a2 | 2007-01-05 16:36:51 -0800 | [diff] [blame] | 826 | ++page->root_count; |
Avi Kivity | 17ac10a | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 827 | vcpu->mmu.root_hpa = root; |
| 828 | return; |
| 829 | } |
| 830 | #endif |
| 831 | for (i = 0; i < 4; ++i) { |
| 832 | hpa_t root = vcpu->mmu.pae_root[i]; |
| 833 | |
| 834 | ASSERT(!VALID_PAGE(root)); |
Avi Kivity | cea0f0e | 2007-01-05 16:36:43 -0800 | [diff] [blame] | 835 | if (vcpu->mmu.root_level == PT32E_ROOT_LEVEL) |
| 836 | root_gfn = vcpu->pdptrs[i] >> PAGE_SHIFT; |
| 837 | else if (vcpu->mmu.root_level == 0) |
| 838 | root_gfn = 0; |
Ingo Molnar | 68a99f6 | 2007-01-05 16:36:59 -0800 | [diff] [blame^] | 839 | page = kvm_mmu_get_page(vcpu, root_gfn, i << 30, |
Avi Kivity | cea0f0e | 2007-01-05 16:36:43 -0800 | [diff] [blame] | 840 | PT32_ROOT_LEVEL, !is_paging(vcpu), |
Ingo Molnar | 68a99f6 | 2007-01-05 16:36:59 -0800 | [diff] [blame^] | 841 | NULL); |
| 842 | root = page->page_hpa; |
Avi Kivity | 3bb65a2 | 2007-01-05 16:36:51 -0800 | [diff] [blame] | 843 | ++page->root_count; |
Avi Kivity | 17ac10a | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 844 | vcpu->mmu.pae_root[i] = root | PT_PRESENT_MASK; |
| 845 | } |
| 846 | vcpu->mmu.root_hpa = __pa(vcpu->mmu.pae_root); |
| 847 | } |
| 848 | |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 849 | static gpa_t nonpaging_gva_to_gpa(struct kvm_vcpu *vcpu, gva_t vaddr) |
| 850 | { |
| 851 | return vaddr; |
| 852 | } |
| 853 | |
| 854 | static int nonpaging_page_fault(struct kvm_vcpu *vcpu, gva_t gva, |
| 855 | u32 error_code) |
| 856 | { |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 857 | gpa_t addr = gva; |
Avi Kivity | ebeace8 | 2007-01-05 16:36:47 -0800 | [diff] [blame] | 858 | hpa_t paddr; |
Avi Kivity | e2dec93 | 2007-01-05 16:36:54 -0800 | [diff] [blame] | 859 | int r; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 860 | |
Avi Kivity | e2dec93 | 2007-01-05 16:36:54 -0800 | [diff] [blame] | 861 | r = mmu_topup_memory_caches(vcpu); |
| 862 | if (r) |
| 863 | return r; |
Avi Kivity | 714b93d | 2007-01-05 16:36:53 -0800 | [diff] [blame] | 864 | |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 865 | ASSERT(vcpu); |
| 866 | ASSERT(VALID_PAGE(vcpu->mmu.root_hpa)); |
| 867 | |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 868 | |
Avi Kivity | ebeace8 | 2007-01-05 16:36:47 -0800 | [diff] [blame] | 869 | paddr = gpa_to_hpa(vcpu , addr & PT64_BASE_ADDR_MASK); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 870 | |
Avi Kivity | ebeace8 | 2007-01-05 16:36:47 -0800 | [diff] [blame] | 871 | if (is_error_hpa(paddr)) |
| 872 | return 1; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 873 | |
Avi Kivity | ebeace8 | 2007-01-05 16:36:47 -0800 | [diff] [blame] | 874 | return nonpaging_map(vcpu, addr & PAGE_MASK, paddr); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 875 | } |
| 876 | |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 877 | static void nonpaging_free(struct kvm_vcpu *vcpu) |
| 878 | { |
Avi Kivity | 17ac10a | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 879 | mmu_free_roots(vcpu); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 880 | } |
| 881 | |
| 882 | static int nonpaging_init_context(struct kvm_vcpu *vcpu) |
| 883 | { |
| 884 | struct kvm_mmu *context = &vcpu->mmu; |
| 885 | |
| 886 | context->new_cr3 = nonpaging_new_cr3; |
| 887 | context->page_fault = nonpaging_page_fault; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 888 | context->gva_to_gpa = nonpaging_gva_to_gpa; |
| 889 | context->free = nonpaging_free; |
Avi Kivity | cea0f0e | 2007-01-05 16:36:43 -0800 | [diff] [blame] | 890 | context->root_level = 0; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 891 | context->shadow_root_level = PT32E_ROOT_LEVEL; |
Avi Kivity | 17ac10a | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 892 | mmu_alloc_roots(vcpu); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 893 | ASSERT(VALID_PAGE(context->root_hpa)); |
| 894 | kvm_arch_ops->set_cr3(vcpu, context->root_hpa); |
| 895 | return 0; |
| 896 | } |
| 897 | |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 898 | static void kvm_mmu_flush_tlb(struct kvm_vcpu *vcpu) |
| 899 | { |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 900 | ++kvm_stat.tlb_flush; |
| 901 | kvm_arch_ops->tlb_flush(vcpu); |
| 902 | } |
| 903 | |
| 904 | static void paging_new_cr3(struct kvm_vcpu *vcpu) |
| 905 | { |
Avi Kivity | 374cbac | 2007-01-05 16:36:43 -0800 | [diff] [blame] | 906 | pgprintk("%s: cr3 %lx\n", __FUNCTION__, vcpu->cr3); |
Avi Kivity | cea0f0e | 2007-01-05 16:36:43 -0800 | [diff] [blame] | 907 | mmu_free_roots(vcpu); |
Ingo Molnar | 7f7417d | 2007-01-05 16:36:57 -0800 | [diff] [blame] | 908 | if (unlikely(vcpu->kvm->n_free_mmu_pages < KVM_MIN_FREE_MMU_PAGES)) |
| 909 | kvm_mmu_free_some_pages(vcpu); |
Avi Kivity | cea0f0e | 2007-01-05 16:36:43 -0800 | [diff] [blame] | 910 | mmu_alloc_roots(vcpu); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 911 | kvm_mmu_flush_tlb(vcpu); |
Avi Kivity | cea0f0e | 2007-01-05 16:36:43 -0800 | [diff] [blame] | 912 | kvm_arch_ops->set_cr3(vcpu, vcpu->mmu.root_hpa); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 913 | } |
| 914 | |
| 915 | static void mark_pagetable_nonglobal(void *shadow_pte) |
| 916 | { |
| 917 | page_header(__pa(shadow_pte))->global = 0; |
| 918 | } |
| 919 | |
| 920 | static inline void set_pte_common(struct kvm_vcpu *vcpu, |
| 921 | u64 *shadow_pte, |
| 922 | gpa_t gaddr, |
| 923 | int dirty, |
Avi Kivity | 815af8d | 2007-01-05 16:36:44 -0800 | [diff] [blame] | 924 | u64 access_bits, |
| 925 | gfn_t gfn) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 926 | { |
| 927 | hpa_t paddr; |
| 928 | |
| 929 | *shadow_pte |= access_bits << PT_SHADOW_BITS_OFFSET; |
| 930 | if (!dirty) |
| 931 | access_bits &= ~PT_WRITABLE_MASK; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 932 | |
| 933 | paddr = gpa_to_hpa(vcpu, gaddr & PT64_BASE_ADDR_MASK); |
| 934 | |
Avi Kivity | 374cbac | 2007-01-05 16:36:43 -0800 | [diff] [blame] | 935 | *shadow_pte |= access_bits; |
| 936 | |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 937 | if (!(*shadow_pte & PT_GLOBAL_MASK)) |
| 938 | mark_pagetable_nonglobal(shadow_pte); |
| 939 | |
| 940 | if (is_error_hpa(paddr)) { |
| 941 | *shadow_pte |= gaddr; |
| 942 | *shadow_pte |= PT_SHADOW_IO_MARK; |
| 943 | *shadow_pte &= ~PT_PRESENT_MASK; |
Avi Kivity | 374cbac | 2007-01-05 16:36:43 -0800 | [diff] [blame] | 944 | return; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 945 | } |
Avi Kivity | 374cbac | 2007-01-05 16:36:43 -0800 | [diff] [blame] | 946 | |
| 947 | *shadow_pte |= paddr; |
| 948 | |
| 949 | if (access_bits & PT_WRITABLE_MASK) { |
| 950 | struct kvm_mmu_page *shadow; |
| 951 | |
Avi Kivity | 815af8d | 2007-01-05 16:36:44 -0800 | [diff] [blame] | 952 | shadow = kvm_mmu_lookup_page(vcpu, gfn); |
Avi Kivity | 374cbac | 2007-01-05 16:36:43 -0800 | [diff] [blame] | 953 | if (shadow) { |
| 954 | pgprintk("%s: found shadow page for %lx, marking ro\n", |
Avi Kivity | 815af8d | 2007-01-05 16:36:44 -0800 | [diff] [blame] | 955 | __FUNCTION__, gfn); |
Avi Kivity | 374cbac | 2007-01-05 16:36:43 -0800 | [diff] [blame] | 956 | access_bits &= ~PT_WRITABLE_MASK; |
Avi Kivity | 40907d5 | 2007-01-05 16:36:55 -0800 | [diff] [blame] | 957 | if (is_writeble_pte(*shadow_pte)) { |
| 958 | *shadow_pte &= ~PT_WRITABLE_MASK; |
| 959 | kvm_arch_ops->tlb_flush(vcpu); |
| 960 | } |
Avi Kivity | 374cbac | 2007-01-05 16:36:43 -0800 | [diff] [blame] | 961 | } |
| 962 | } |
| 963 | |
| 964 | if (access_bits & PT_WRITABLE_MASK) |
| 965 | mark_page_dirty(vcpu->kvm, gaddr >> PAGE_SHIFT); |
| 966 | |
| 967 | page_header_update_slot(vcpu->kvm, shadow_pte, gaddr); |
Avi Kivity | 714b93d | 2007-01-05 16:36:53 -0800 | [diff] [blame] | 968 | rmap_add(vcpu, shadow_pte); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 969 | } |
| 970 | |
| 971 | static void inject_page_fault(struct kvm_vcpu *vcpu, |
| 972 | u64 addr, |
| 973 | u32 err_code) |
| 974 | { |
| 975 | kvm_arch_ops->inject_page_fault(vcpu, addr, err_code); |
| 976 | } |
| 977 | |
| 978 | static inline int fix_read_pf(u64 *shadow_ent) |
| 979 | { |
| 980 | if ((*shadow_ent & PT_SHADOW_USER_MASK) && |
| 981 | !(*shadow_ent & PT_USER_MASK)) { |
| 982 | /* |
| 983 | * If supervisor write protect is disabled, we shadow kernel |
| 984 | * pages as user pages so we can trap the write access. |
| 985 | */ |
| 986 | *shadow_ent |= PT_USER_MASK; |
| 987 | *shadow_ent &= ~PT_WRITABLE_MASK; |
| 988 | |
| 989 | return 1; |
| 990 | |
| 991 | } |
| 992 | return 0; |
| 993 | } |
| 994 | |
| 995 | static int may_access(u64 pte, int write, int user) |
| 996 | { |
| 997 | |
| 998 | if (user && !(pte & PT_USER_MASK)) |
| 999 | return 0; |
| 1000 | if (write && !(pte & PT_WRITABLE_MASK)) |
| 1001 | return 0; |
| 1002 | return 1; |
| 1003 | } |
| 1004 | |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1005 | static void paging_free(struct kvm_vcpu *vcpu) |
| 1006 | { |
| 1007 | nonpaging_free(vcpu); |
| 1008 | } |
| 1009 | |
| 1010 | #define PTTYPE 64 |
| 1011 | #include "paging_tmpl.h" |
| 1012 | #undef PTTYPE |
| 1013 | |
| 1014 | #define PTTYPE 32 |
| 1015 | #include "paging_tmpl.h" |
| 1016 | #undef PTTYPE |
| 1017 | |
Avi Kivity | 17ac10a | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 1018 | static int paging64_init_context_common(struct kvm_vcpu *vcpu, int level) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1019 | { |
| 1020 | struct kvm_mmu *context = &vcpu->mmu; |
| 1021 | |
| 1022 | ASSERT(is_pae(vcpu)); |
| 1023 | context->new_cr3 = paging_new_cr3; |
| 1024 | context->page_fault = paging64_page_fault; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1025 | context->gva_to_gpa = paging64_gva_to_gpa; |
| 1026 | context->free = paging_free; |
Avi Kivity | 17ac10a | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 1027 | context->root_level = level; |
| 1028 | context->shadow_root_level = level; |
| 1029 | mmu_alloc_roots(vcpu); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1030 | ASSERT(VALID_PAGE(context->root_hpa)); |
| 1031 | kvm_arch_ops->set_cr3(vcpu, context->root_hpa | |
| 1032 | (vcpu->cr3 & (CR3_PCD_MASK | CR3_WPT_MASK))); |
| 1033 | return 0; |
| 1034 | } |
| 1035 | |
Avi Kivity | 17ac10a | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 1036 | static int paging64_init_context(struct kvm_vcpu *vcpu) |
| 1037 | { |
| 1038 | return paging64_init_context_common(vcpu, PT64_ROOT_LEVEL); |
| 1039 | } |
| 1040 | |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1041 | static int paging32_init_context(struct kvm_vcpu *vcpu) |
| 1042 | { |
| 1043 | struct kvm_mmu *context = &vcpu->mmu; |
| 1044 | |
| 1045 | context->new_cr3 = paging_new_cr3; |
| 1046 | context->page_fault = paging32_page_fault; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1047 | context->gva_to_gpa = paging32_gva_to_gpa; |
| 1048 | context->free = paging_free; |
| 1049 | context->root_level = PT32_ROOT_LEVEL; |
| 1050 | context->shadow_root_level = PT32E_ROOT_LEVEL; |
Avi Kivity | 17ac10a | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 1051 | mmu_alloc_roots(vcpu); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1052 | ASSERT(VALID_PAGE(context->root_hpa)); |
| 1053 | kvm_arch_ops->set_cr3(vcpu, context->root_hpa | |
| 1054 | (vcpu->cr3 & (CR3_PCD_MASK | CR3_WPT_MASK))); |
| 1055 | return 0; |
| 1056 | } |
| 1057 | |
| 1058 | static int paging32E_init_context(struct kvm_vcpu *vcpu) |
| 1059 | { |
Avi Kivity | 17ac10a | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 1060 | return paging64_init_context_common(vcpu, PT32E_ROOT_LEVEL); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1061 | } |
| 1062 | |
| 1063 | static int init_kvm_mmu(struct kvm_vcpu *vcpu) |
| 1064 | { |
| 1065 | ASSERT(vcpu); |
| 1066 | ASSERT(!VALID_PAGE(vcpu->mmu.root_hpa)); |
| 1067 | |
| 1068 | if (!is_paging(vcpu)) |
| 1069 | return nonpaging_init_context(vcpu); |
Avi Kivity | a9058ec | 2006-12-29 16:49:37 -0800 | [diff] [blame] | 1070 | else if (is_long_mode(vcpu)) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1071 | return paging64_init_context(vcpu); |
| 1072 | else if (is_pae(vcpu)) |
| 1073 | return paging32E_init_context(vcpu); |
| 1074 | else |
| 1075 | return paging32_init_context(vcpu); |
| 1076 | } |
| 1077 | |
| 1078 | static void destroy_kvm_mmu(struct kvm_vcpu *vcpu) |
| 1079 | { |
| 1080 | ASSERT(vcpu); |
| 1081 | if (VALID_PAGE(vcpu->mmu.root_hpa)) { |
| 1082 | vcpu->mmu.free(vcpu); |
| 1083 | vcpu->mmu.root_hpa = INVALID_PAGE; |
| 1084 | } |
| 1085 | } |
| 1086 | |
| 1087 | int kvm_mmu_reset_context(struct kvm_vcpu *vcpu) |
| 1088 | { |
Avi Kivity | 714b93d | 2007-01-05 16:36:53 -0800 | [diff] [blame] | 1089 | int r; |
| 1090 | |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1091 | destroy_kvm_mmu(vcpu); |
Avi Kivity | 714b93d | 2007-01-05 16:36:53 -0800 | [diff] [blame] | 1092 | r = init_kvm_mmu(vcpu); |
| 1093 | if (r < 0) |
| 1094 | goto out; |
Avi Kivity | e2dec93 | 2007-01-05 16:36:54 -0800 | [diff] [blame] | 1095 | r = mmu_topup_memory_caches(vcpu); |
Avi Kivity | 714b93d | 2007-01-05 16:36:53 -0800 | [diff] [blame] | 1096 | out: |
| 1097 | return r; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1098 | } |
| 1099 | |
Avi Kivity | da4a00f | 2007-01-05 16:36:44 -0800 | [diff] [blame] | 1100 | void kvm_mmu_pre_write(struct kvm_vcpu *vcpu, gpa_t gpa, int bytes) |
| 1101 | { |
Avi Kivity | 9b7a032 | 2007-01-05 16:36:45 -0800 | [diff] [blame] | 1102 | gfn_t gfn = gpa >> PAGE_SHIFT; |
| 1103 | struct kvm_mmu_page *page; |
| 1104 | struct kvm_mmu_page *child; |
Avi Kivity | 0e7bc4b | 2007-01-05 16:36:48 -0800 | [diff] [blame] | 1105 | struct hlist_node *node, *n; |
Avi Kivity | 9b7a032 | 2007-01-05 16:36:45 -0800 | [diff] [blame] | 1106 | struct hlist_head *bucket; |
| 1107 | unsigned index; |
| 1108 | u64 *spte; |
| 1109 | u64 pte; |
| 1110 | unsigned offset = offset_in_page(gpa); |
Avi Kivity | 0e7bc4b | 2007-01-05 16:36:48 -0800 | [diff] [blame] | 1111 | unsigned pte_size; |
Avi Kivity | 9b7a032 | 2007-01-05 16:36:45 -0800 | [diff] [blame] | 1112 | unsigned page_offset; |
Avi Kivity | 0e7bc4b | 2007-01-05 16:36:48 -0800 | [diff] [blame] | 1113 | unsigned misaligned; |
Avi Kivity | 9b7a032 | 2007-01-05 16:36:45 -0800 | [diff] [blame] | 1114 | int level; |
Avi Kivity | 86a5ba0 | 2007-01-05 16:36:50 -0800 | [diff] [blame] | 1115 | int flooded = 0; |
Avi Kivity | 9b7a032 | 2007-01-05 16:36:45 -0800 | [diff] [blame] | 1116 | |
Avi Kivity | da4a00f | 2007-01-05 16:36:44 -0800 | [diff] [blame] | 1117 | pgprintk("%s: gpa %llx bytes %d\n", __FUNCTION__, gpa, bytes); |
Avi Kivity | 86a5ba0 | 2007-01-05 16:36:50 -0800 | [diff] [blame] | 1118 | if (gfn == vcpu->last_pt_write_gfn) { |
| 1119 | ++vcpu->last_pt_write_count; |
| 1120 | if (vcpu->last_pt_write_count >= 3) |
| 1121 | flooded = 1; |
| 1122 | } else { |
| 1123 | vcpu->last_pt_write_gfn = gfn; |
| 1124 | vcpu->last_pt_write_count = 1; |
| 1125 | } |
Avi Kivity | 9b7a032 | 2007-01-05 16:36:45 -0800 | [diff] [blame] | 1126 | index = kvm_page_table_hashfn(gfn) % KVM_NUM_MMU_PAGES; |
| 1127 | bucket = &vcpu->kvm->mmu_page_hash[index]; |
Avi Kivity | 0e7bc4b | 2007-01-05 16:36:48 -0800 | [diff] [blame] | 1128 | hlist_for_each_entry_safe(page, node, n, bucket, hash_link) { |
Avi Kivity | 9b7a032 | 2007-01-05 16:36:45 -0800 | [diff] [blame] | 1129 | if (page->gfn != gfn || page->role.metaphysical) |
| 1130 | continue; |
Avi Kivity | 0e7bc4b | 2007-01-05 16:36:48 -0800 | [diff] [blame] | 1131 | pte_size = page->role.glevels == PT32_ROOT_LEVEL ? 4 : 8; |
| 1132 | misaligned = (offset ^ (offset + bytes - 1)) & ~(pte_size - 1); |
Avi Kivity | 86a5ba0 | 2007-01-05 16:36:50 -0800 | [diff] [blame] | 1133 | if (misaligned || flooded) { |
Avi Kivity | 0e7bc4b | 2007-01-05 16:36:48 -0800 | [diff] [blame] | 1134 | /* |
| 1135 | * Misaligned accesses are too much trouble to fix |
| 1136 | * up; also, they usually indicate a page is not used |
| 1137 | * as a page table. |
Avi Kivity | 86a5ba0 | 2007-01-05 16:36:50 -0800 | [diff] [blame] | 1138 | * |
| 1139 | * If we're seeing too many writes to a page, |
| 1140 | * it may no longer be a page table, or we may be |
| 1141 | * forking, in which case it is better to unmap the |
| 1142 | * page. |
Avi Kivity | 0e7bc4b | 2007-01-05 16:36:48 -0800 | [diff] [blame] | 1143 | */ |
| 1144 | pgprintk("misaligned: gpa %llx bytes %d role %x\n", |
| 1145 | gpa, bytes, page->role.word); |
| 1146 | kvm_mmu_zap_page(vcpu, page); |
| 1147 | continue; |
| 1148 | } |
Avi Kivity | 9b7a032 | 2007-01-05 16:36:45 -0800 | [diff] [blame] | 1149 | page_offset = offset; |
| 1150 | level = page->role.level; |
| 1151 | if (page->role.glevels == PT32_ROOT_LEVEL) { |
| 1152 | page_offset <<= 1; /* 32->64 */ |
| 1153 | page_offset &= ~PAGE_MASK; |
| 1154 | } |
| 1155 | spte = __va(page->page_hpa); |
| 1156 | spte += page_offset / sizeof(*spte); |
| 1157 | pte = *spte; |
| 1158 | if (is_present_pte(pte)) { |
| 1159 | if (level == PT_PAGE_TABLE_LEVEL) |
Avi Kivity | 714b93d | 2007-01-05 16:36:53 -0800 | [diff] [blame] | 1160 | rmap_remove(vcpu, spte); |
Avi Kivity | 9b7a032 | 2007-01-05 16:36:45 -0800 | [diff] [blame] | 1161 | else { |
| 1162 | child = page_header(pte & PT64_BASE_ADDR_MASK); |
Avi Kivity | 714b93d | 2007-01-05 16:36:53 -0800 | [diff] [blame] | 1163 | mmu_page_remove_parent_pte(vcpu, child, spte); |
Avi Kivity | 9b7a032 | 2007-01-05 16:36:45 -0800 | [diff] [blame] | 1164 | } |
| 1165 | } |
| 1166 | *spte = 0; |
| 1167 | } |
Avi Kivity | da4a00f | 2007-01-05 16:36:44 -0800 | [diff] [blame] | 1168 | } |
| 1169 | |
| 1170 | void kvm_mmu_post_write(struct kvm_vcpu *vcpu, gpa_t gpa, int bytes) |
| 1171 | { |
| 1172 | } |
| 1173 | |
Avi Kivity | a436036 | 2007-01-05 16:36:45 -0800 | [diff] [blame] | 1174 | int kvm_mmu_unprotect_page_virt(struct kvm_vcpu *vcpu, gva_t gva) |
| 1175 | { |
| 1176 | gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, gva); |
| 1177 | |
| 1178 | return kvm_mmu_unprotect_page(vcpu, gpa >> PAGE_SHIFT); |
| 1179 | } |
| 1180 | |
Avi Kivity | ebeace8 | 2007-01-05 16:36:47 -0800 | [diff] [blame] | 1181 | void kvm_mmu_free_some_pages(struct kvm_vcpu *vcpu) |
| 1182 | { |
| 1183 | while (vcpu->kvm->n_free_mmu_pages < KVM_REFILL_PAGES) { |
| 1184 | struct kvm_mmu_page *page; |
| 1185 | |
| 1186 | page = container_of(vcpu->kvm->active_mmu_pages.prev, |
| 1187 | struct kvm_mmu_page, link); |
| 1188 | kvm_mmu_zap_page(vcpu, page); |
| 1189 | } |
| 1190 | } |
| 1191 | EXPORT_SYMBOL_GPL(kvm_mmu_free_some_pages); |
| 1192 | |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1193 | static void free_mmu_pages(struct kvm_vcpu *vcpu) |
| 1194 | { |
Avi Kivity | f51234c | 2007-01-05 16:36:52 -0800 | [diff] [blame] | 1195 | struct kvm_mmu_page *page; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1196 | |
Avi Kivity | f51234c | 2007-01-05 16:36:52 -0800 | [diff] [blame] | 1197 | while (!list_empty(&vcpu->kvm->active_mmu_pages)) { |
| 1198 | page = container_of(vcpu->kvm->active_mmu_pages.next, |
| 1199 | struct kvm_mmu_page, link); |
| 1200 | kvm_mmu_zap_page(vcpu, page); |
| 1201 | } |
| 1202 | while (!list_empty(&vcpu->free_pages)) { |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1203 | page = list_entry(vcpu->free_pages.next, |
| 1204 | struct kvm_mmu_page, link); |
| 1205 | list_del(&page->link); |
| 1206 | __free_page(pfn_to_page(page->page_hpa >> PAGE_SHIFT)); |
| 1207 | page->page_hpa = INVALID_PAGE; |
| 1208 | } |
Avi Kivity | 17ac10a | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 1209 | free_page((unsigned long)vcpu->mmu.pae_root); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1210 | } |
| 1211 | |
| 1212 | static int alloc_mmu_pages(struct kvm_vcpu *vcpu) |
| 1213 | { |
Avi Kivity | 17ac10a | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 1214 | struct page *page; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1215 | int i; |
| 1216 | |
| 1217 | ASSERT(vcpu); |
| 1218 | |
| 1219 | for (i = 0; i < KVM_NUM_MMU_PAGES; i++) { |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1220 | struct kvm_mmu_page *page_header = &vcpu->page_header_buf[i]; |
| 1221 | |
| 1222 | INIT_LIST_HEAD(&page_header->link); |
Avi Kivity | 17ac10a | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 1223 | if ((page = alloc_page(GFP_KERNEL)) == NULL) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1224 | goto error_1; |
| 1225 | page->private = (unsigned long)page_header; |
| 1226 | page_header->page_hpa = (hpa_t)page_to_pfn(page) << PAGE_SHIFT; |
| 1227 | memset(__va(page_header->page_hpa), 0, PAGE_SIZE); |
| 1228 | list_add(&page_header->link, &vcpu->free_pages); |
Avi Kivity | ebeace8 | 2007-01-05 16:36:47 -0800 | [diff] [blame] | 1229 | ++vcpu->kvm->n_free_mmu_pages; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1230 | } |
Avi Kivity | 17ac10a | 2007-01-05 16:36:40 -0800 | [diff] [blame] | 1231 | |
| 1232 | /* |
| 1233 | * When emulating 32-bit mode, cr3 is only 32 bits even on x86_64. |
| 1234 | * Therefore we need to allocate shadow page tables in the first |
| 1235 | * 4GB of memory, which happens to fit the DMA32 zone. |
| 1236 | */ |
| 1237 | page = alloc_page(GFP_KERNEL | __GFP_DMA32); |
| 1238 | if (!page) |
| 1239 | goto error_1; |
| 1240 | vcpu->mmu.pae_root = page_address(page); |
| 1241 | for (i = 0; i < 4; ++i) |
| 1242 | vcpu->mmu.pae_root[i] = INVALID_PAGE; |
| 1243 | |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1244 | return 0; |
| 1245 | |
| 1246 | error_1: |
| 1247 | free_mmu_pages(vcpu); |
| 1248 | return -ENOMEM; |
| 1249 | } |
| 1250 | |
Ingo Molnar | 8018c27 | 2006-12-29 16:50:01 -0800 | [diff] [blame] | 1251 | int kvm_mmu_create(struct kvm_vcpu *vcpu) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1252 | { |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1253 | ASSERT(vcpu); |
| 1254 | ASSERT(!VALID_PAGE(vcpu->mmu.root_hpa)); |
| 1255 | ASSERT(list_empty(&vcpu->free_pages)); |
| 1256 | |
Ingo Molnar | 8018c27 | 2006-12-29 16:50:01 -0800 | [diff] [blame] | 1257 | return alloc_mmu_pages(vcpu); |
| 1258 | } |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1259 | |
Ingo Molnar | 8018c27 | 2006-12-29 16:50:01 -0800 | [diff] [blame] | 1260 | int kvm_mmu_setup(struct kvm_vcpu *vcpu) |
| 1261 | { |
| 1262 | ASSERT(vcpu); |
| 1263 | ASSERT(!VALID_PAGE(vcpu->mmu.root_hpa)); |
| 1264 | ASSERT(!list_empty(&vcpu->free_pages)); |
Avi Kivity | 2c26495 | 2006-12-22 01:05:28 -0800 | [diff] [blame] | 1265 | |
Ingo Molnar | 8018c27 | 2006-12-29 16:50:01 -0800 | [diff] [blame] | 1266 | return init_kvm_mmu(vcpu); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1267 | } |
| 1268 | |
| 1269 | void kvm_mmu_destroy(struct kvm_vcpu *vcpu) |
| 1270 | { |
| 1271 | ASSERT(vcpu); |
| 1272 | |
| 1273 | destroy_kvm_mmu(vcpu); |
| 1274 | free_mmu_pages(vcpu); |
Avi Kivity | 714b93d | 2007-01-05 16:36:53 -0800 | [diff] [blame] | 1275 | mmu_free_memory_caches(vcpu); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1276 | } |
| 1277 | |
Avi Kivity | 714b93d | 2007-01-05 16:36:53 -0800 | [diff] [blame] | 1278 | void kvm_mmu_slot_remove_write_access(struct kvm_vcpu *vcpu, int slot) |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1279 | { |
Avi Kivity | 714b93d | 2007-01-05 16:36:53 -0800 | [diff] [blame] | 1280 | struct kvm *kvm = vcpu->kvm; |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1281 | struct kvm_mmu_page *page; |
| 1282 | |
| 1283 | list_for_each_entry(page, &kvm->active_mmu_pages, link) { |
| 1284 | int i; |
| 1285 | u64 *pt; |
| 1286 | |
| 1287 | if (!test_bit(slot, &page->slot_bitmap)) |
| 1288 | continue; |
| 1289 | |
| 1290 | pt = __va(page->page_hpa); |
| 1291 | for (i = 0; i < PT64_ENT_PER_PAGE; ++i) |
| 1292 | /* avoid RMW */ |
Avi Kivity | cd4a4e5 | 2007-01-05 16:36:38 -0800 | [diff] [blame] | 1293 | if (pt[i] & PT_WRITABLE_MASK) { |
Avi Kivity | 714b93d | 2007-01-05 16:36:53 -0800 | [diff] [blame] | 1294 | rmap_remove(vcpu, &pt[i]); |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1295 | pt[i] &= ~PT_WRITABLE_MASK; |
Avi Kivity | cd4a4e5 | 2007-01-05 16:36:38 -0800 | [diff] [blame] | 1296 | } |
Avi Kivity | 6aa8b73 | 2006-12-10 02:21:36 -0800 | [diff] [blame] | 1297 | } |
| 1298 | } |
Avi Kivity | 37a7d8b | 2007-01-05 16:36:56 -0800 | [diff] [blame] | 1299 | |
| 1300 | #ifdef AUDIT |
| 1301 | |
| 1302 | static const char *audit_msg; |
| 1303 | |
| 1304 | static gva_t canonicalize(gva_t gva) |
| 1305 | { |
| 1306 | #ifdef CONFIG_X86_64 |
| 1307 | gva = (long long)(gva << 16) >> 16; |
| 1308 | #endif |
| 1309 | return gva; |
| 1310 | } |
| 1311 | |
| 1312 | static void audit_mappings_page(struct kvm_vcpu *vcpu, u64 page_pte, |
| 1313 | gva_t va, int level) |
| 1314 | { |
| 1315 | u64 *pt = __va(page_pte & PT64_BASE_ADDR_MASK); |
| 1316 | int i; |
| 1317 | gva_t va_delta = 1ul << (PAGE_SHIFT + 9 * (level - 1)); |
| 1318 | |
| 1319 | for (i = 0; i < PT64_ENT_PER_PAGE; ++i, va += va_delta) { |
| 1320 | u64 ent = pt[i]; |
| 1321 | |
| 1322 | if (!ent & PT_PRESENT_MASK) |
| 1323 | continue; |
| 1324 | |
| 1325 | va = canonicalize(va); |
| 1326 | if (level > 1) |
| 1327 | audit_mappings_page(vcpu, ent, va, level - 1); |
| 1328 | else { |
| 1329 | gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, va); |
| 1330 | hpa_t hpa = gpa_to_hpa(vcpu, gpa); |
| 1331 | |
| 1332 | if ((ent & PT_PRESENT_MASK) |
| 1333 | && (ent & PT64_BASE_ADDR_MASK) != hpa) |
| 1334 | printk(KERN_ERR "audit error: (%s) levels %d" |
| 1335 | " gva %lx gpa %llx hpa %llx ent %llx\n", |
| 1336 | audit_msg, vcpu->mmu.root_level, |
| 1337 | va, gpa, hpa, ent); |
| 1338 | } |
| 1339 | } |
| 1340 | } |
| 1341 | |
| 1342 | static void audit_mappings(struct kvm_vcpu *vcpu) |
| 1343 | { |
| 1344 | int i; |
| 1345 | |
| 1346 | if (vcpu->mmu.root_level == 4) |
| 1347 | audit_mappings_page(vcpu, vcpu->mmu.root_hpa, 0, 4); |
| 1348 | else |
| 1349 | for (i = 0; i < 4; ++i) |
| 1350 | if (vcpu->mmu.pae_root[i] & PT_PRESENT_MASK) |
| 1351 | audit_mappings_page(vcpu, |
| 1352 | vcpu->mmu.pae_root[i], |
| 1353 | i << 30, |
| 1354 | 2); |
| 1355 | } |
| 1356 | |
| 1357 | static int count_rmaps(struct kvm_vcpu *vcpu) |
| 1358 | { |
| 1359 | int nmaps = 0; |
| 1360 | int i, j, k; |
| 1361 | |
| 1362 | for (i = 0; i < KVM_MEMORY_SLOTS; ++i) { |
| 1363 | struct kvm_memory_slot *m = &vcpu->kvm->memslots[i]; |
| 1364 | struct kvm_rmap_desc *d; |
| 1365 | |
| 1366 | for (j = 0; j < m->npages; ++j) { |
| 1367 | struct page *page = m->phys_mem[j]; |
| 1368 | |
| 1369 | if (!page->private) |
| 1370 | continue; |
| 1371 | if (!(page->private & 1)) { |
| 1372 | ++nmaps; |
| 1373 | continue; |
| 1374 | } |
| 1375 | d = (struct kvm_rmap_desc *)(page->private & ~1ul); |
| 1376 | while (d) { |
| 1377 | for (k = 0; k < RMAP_EXT; ++k) |
| 1378 | if (d->shadow_ptes[k]) |
| 1379 | ++nmaps; |
| 1380 | else |
| 1381 | break; |
| 1382 | d = d->more; |
| 1383 | } |
| 1384 | } |
| 1385 | } |
| 1386 | return nmaps; |
| 1387 | } |
| 1388 | |
| 1389 | static int count_writable_mappings(struct kvm_vcpu *vcpu) |
| 1390 | { |
| 1391 | int nmaps = 0; |
| 1392 | struct kvm_mmu_page *page; |
| 1393 | int i; |
| 1394 | |
| 1395 | list_for_each_entry(page, &vcpu->kvm->active_mmu_pages, link) { |
| 1396 | u64 *pt = __va(page->page_hpa); |
| 1397 | |
| 1398 | if (page->role.level != PT_PAGE_TABLE_LEVEL) |
| 1399 | continue; |
| 1400 | |
| 1401 | for (i = 0; i < PT64_ENT_PER_PAGE; ++i) { |
| 1402 | u64 ent = pt[i]; |
| 1403 | |
| 1404 | if (!(ent & PT_PRESENT_MASK)) |
| 1405 | continue; |
| 1406 | if (!(ent & PT_WRITABLE_MASK)) |
| 1407 | continue; |
| 1408 | ++nmaps; |
| 1409 | } |
| 1410 | } |
| 1411 | return nmaps; |
| 1412 | } |
| 1413 | |
| 1414 | static void audit_rmap(struct kvm_vcpu *vcpu) |
| 1415 | { |
| 1416 | int n_rmap = count_rmaps(vcpu); |
| 1417 | int n_actual = count_writable_mappings(vcpu); |
| 1418 | |
| 1419 | if (n_rmap != n_actual) |
| 1420 | printk(KERN_ERR "%s: (%s) rmap %d actual %d\n", |
| 1421 | __FUNCTION__, audit_msg, n_rmap, n_actual); |
| 1422 | } |
| 1423 | |
| 1424 | static void audit_write_protection(struct kvm_vcpu *vcpu) |
| 1425 | { |
| 1426 | struct kvm_mmu_page *page; |
| 1427 | |
| 1428 | list_for_each_entry(page, &vcpu->kvm->active_mmu_pages, link) { |
| 1429 | hfn_t hfn; |
| 1430 | struct page *pg; |
| 1431 | |
| 1432 | if (page->role.metaphysical) |
| 1433 | continue; |
| 1434 | |
| 1435 | hfn = gpa_to_hpa(vcpu, (gpa_t)page->gfn << PAGE_SHIFT) |
| 1436 | >> PAGE_SHIFT; |
| 1437 | pg = pfn_to_page(hfn); |
| 1438 | if (pg->private) |
| 1439 | printk(KERN_ERR "%s: (%s) shadow page has writable" |
| 1440 | " mappings: gfn %lx role %x\n", |
| 1441 | __FUNCTION__, audit_msg, page->gfn, |
| 1442 | page->role.word); |
| 1443 | } |
| 1444 | } |
| 1445 | |
| 1446 | static void kvm_mmu_audit(struct kvm_vcpu *vcpu, const char *msg) |
| 1447 | { |
| 1448 | int olddbg = dbg; |
| 1449 | |
| 1450 | dbg = 0; |
| 1451 | audit_msg = msg; |
| 1452 | audit_rmap(vcpu); |
| 1453 | audit_write_protection(vcpu); |
| 1454 | audit_mappings(vcpu); |
| 1455 | dbg = olddbg; |
| 1456 | } |
| 1457 | |
| 1458 | #endif |