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