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Commit | Line | Data |
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6aa8b732 AK |
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 | */ | |
e495606d AK |
19 | |
20 | #include "vmx.h" | |
21 | #include "kvm.h" | |
22 | ||
6aa8b732 AK |
23 | #include <linux/types.h> |
24 | #include <linux/string.h> | |
6aa8b732 AK |
25 | #include <linux/mm.h> |
26 | #include <linux/highmem.h> | |
27 | #include <linux/module.h> | |
28 | ||
e495606d AK |
29 | #include <asm/page.h> |
30 | #include <asm/cmpxchg.h> | |
6aa8b732 | 31 | |
37a7d8b0 AK |
32 | #undef MMU_DEBUG |
33 | ||
34 | #undef AUDIT | |
35 | ||
36 | #ifdef AUDIT | |
37 | static void kvm_mmu_audit(struct kvm_vcpu *vcpu, const char *msg); | |
38 | #else | |
39 | static void kvm_mmu_audit(struct kvm_vcpu *vcpu, const char *msg) {} | |
40 | #endif | |
41 | ||
42 | #ifdef MMU_DEBUG | |
43 | ||
44 | #define pgprintk(x...) do { if (dbg) printk(x); } while (0) | |
45 | #define rmap_printk(x...) do { if (dbg) printk(x); } while (0) | |
46 | ||
47 | #else | |
48 | ||
49 | #define pgprintk(x...) do { } while (0) | |
50 | #define rmap_printk(x...) do { } while (0) | |
51 | ||
52 | #endif | |
53 | ||
54 | #if defined(MMU_DEBUG) || defined(AUDIT) | |
55 | static int dbg = 1; | |
56 | #endif | |
6aa8b732 | 57 | |
d6c69ee9 YD |
58 | #ifndef MMU_DEBUG |
59 | #define ASSERT(x) do { } while (0) | |
60 | #else | |
6aa8b732 AK |
61 | #define ASSERT(x) \ |
62 | if (!(x)) { \ | |
63 | printk(KERN_WARNING "assertion failed %s:%d: %s\n", \ | |
64 | __FILE__, __LINE__, #x); \ | |
65 | } | |
d6c69ee9 | 66 | #endif |
6aa8b732 | 67 | |
cea0f0e7 AK |
68 | #define PT64_PT_BITS 9 |
69 | #define PT64_ENT_PER_PAGE (1 << PT64_PT_BITS) | |
70 | #define PT32_PT_BITS 10 | |
71 | #define PT32_ENT_PER_PAGE (1 << PT32_PT_BITS) | |
6aa8b732 AK |
72 | |
73 | #define PT_WRITABLE_SHIFT 1 | |
74 | ||
75 | #define PT_PRESENT_MASK (1ULL << 0) | |
76 | #define PT_WRITABLE_MASK (1ULL << PT_WRITABLE_SHIFT) | |
77 | #define PT_USER_MASK (1ULL << 2) | |
78 | #define PT_PWT_MASK (1ULL << 3) | |
79 | #define PT_PCD_MASK (1ULL << 4) | |
80 | #define PT_ACCESSED_MASK (1ULL << 5) | |
81 | #define PT_DIRTY_MASK (1ULL << 6) | |
82 | #define PT_PAGE_SIZE_MASK (1ULL << 7) | |
83 | #define PT_PAT_MASK (1ULL << 7) | |
84 | #define PT_GLOBAL_MASK (1ULL << 8) | |
85 | #define PT64_NX_MASK (1ULL << 63) | |
86 | ||
87 | #define PT_PAT_SHIFT 7 | |
88 | #define PT_DIR_PAT_SHIFT 12 | |
89 | #define PT_DIR_PAT_MASK (1ULL << PT_DIR_PAT_SHIFT) | |
90 | ||
91 | #define PT32_DIR_PSE36_SIZE 4 | |
92 | #define PT32_DIR_PSE36_SHIFT 13 | |
93 | #define PT32_DIR_PSE36_MASK (((1ULL << PT32_DIR_PSE36_SIZE) - 1) << PT32_DIR_PSE36_SHIFT) | |
94 | ||
95 | ||
6aa8b732 AK |
96 | #define PT_FIRST_AVAIL_BITS_SHIFT 9 |
97 | #define PT64_SECOND_AVAIL_BITS_SHIFT 52 | |
98 | ||
6aa8b732 AK |
99 | #define PT_SHADOW_IO_MARK (1ULL << PT_FIRST_AVAIL_BITS_SHIFT) |
100 | ||
6aa8b732 AK |
101 | #define VALID_PAGE(x) ((x) != INVALID_PAGE) |
102 | ||
103 | #define PT64_LEVEL_BITS 9 | |
104 | ||
105 | #define PT64_LEVEL_SHIFT(level) \ | |
106 | ( PAGE_SHIFT + (level - 1) * PT64_LEVEL_BITS ) | |
107 | ||
108 | #define PT64_LEVEL_MASK(level) \ | |
109 | (((1ULL << PT64_LEVEL_BITS) - 1) << PT64_LEVEL_SHIFT(level)) | |
110 | ||
111 | #define PT64_INDEX(address, level)\ | |
112 | (((address) >> PT64_LEVEL_SHIFT(level)) & ((1 << PT64_LEVEL_BITS) - 1)) | |
113 | ||
114 | ||
115 | #define PT32_LEVEL_BITS 10 | |
116 | ||
117 | #define PT32_LEVEL_SHIFT(level) \ | |
118 | ( PAGE_SHIFT + (level - 1) * PT32_LEVEL_BITS ) | |
119 | ||
120 | #define PT32_LEVEL_MASK(level) \ | |
121 | (((1ULL << PT32_LEVEL_BITS) - 1) << PT32_LEVEL_SHIFT(level)) | |
122 | ||
123 | #define PT32_INDEX(address, level)\ | |
124 | (((address) >> PT32_LEVEL_SHIFT(level)) & ((1 << PT32_LEVEL_BITS) - 1)) | |
125 | ||
126 | ||
27aba766 | 127 | #define PT64_BASE_ADDR_MASK (((1ULL << 52) - 1) & ~(u64)(PAGE_SIZE-1)) |
6aa8b732 AK |
128 | #define PT64_DIR_BASE_ADDR_MASK \ |
129 | (PT64_BASE_ADDR_MASK & ~((1ULL << (PAGE_SHIFT + PT64_LEVEL_BITS)) - 1)) | |
130 | ||
131 | #define PT32_BASE_ADDR_MASK PAGE_MASK | |
132 | #define PT32_DIR_BASE_ADDR_MASK \ | |
133 | (PAGE_MASK & ~((1ULL << (PAGE_SHIFT + PT32_LEVEL_BITS)) - 1)) | |
134 | ||
135 | ||
136 | #define PFERR_PRESENT_MASK (1U << 0) | |
137 | #define PFERR_WRITE_MASK (1U << 1) | |
138 | #define PFERR_USER_MASK (1U << 2) | |
73b1087e | 139 | #define PFERR_FETCH_MASK (1U << 4) |
6aa8b732 AK |
140 | |
141 | #define PT64_ROOT_LEVEL 4 | |
142 | #define PT32_ROOT_LEVEL 2 | |
143 | #define PT32E_ROOT_LEVEL 3 | |
144 | ||
145 | #define PT_DIRECTORY_LEVEL 2 | |
146 | #define PT_PAGE_TABLE_LEVEL 1 | |
147 | ||
cd4a4e53 AK |
148 | #define RMAP_EXT 4 |
149 | ||
150 | struct kvm_rmap_desc { | |
151 | u64 *shadow_ptes[RMAP_EXT]; | |
152 | struct kvm_rmap_desc *more; | |
153 | }; | |
154 | ||
b5a33a75 AK |
155 | static struct kmem_cache *pte_chain_cache; |
156 | static struct kmem_cache *rmap_desc_cache; | |
d3d25b04 | 157 | static struct kmem_cache *mmu_page_header_cache; |
b5a33a75 | 158 | |
6aa8b732 AK |
159 | static int is_write_protection(struct kvm_vcpu *vcpu) |
160 | { | |
161 | return vcpu->cr0 & CR0_WP_MASK; | |
162 | } | |
163 | ||
164 | static int is_cpuid_PSE36(void) | |
165 | { | |
166 | return 1; | |
167 | } | |
168 | ||
73b1087e AK |
169 | static int is_nx(struct kvm_vcpu *vcpu) |
170 | { | |
171 | return vcpu->shadow_efer & EFER_NX; | |
172 | } | |
173 | ||
6aa8b732 AK |
174 | static int is_present_pte(unsigned long pte) |
175 | { | |
176 | return pte & PT_PRESENT_MASK; | |
177 | } | |
178 | ||
179 | static int is_writeble_pte(unsigned long pte) | |
180 | { | |
181 | return pte & PT_WRITABLE_MASK; | |
182 | } | |
183 | ||
184 | static int is_io_pte(unsigned long pte) | |
185 | { | |
186 | return pte & PT_SHADOW_IO_MARK; | |
187 | } | |
188 | ||
cd4a4e53 AK |
189 | static int is_rmap_pte(u64 pte) |
190 | { | |
191 | return (pte & (PT_WRITABLE_MASK | PT_PRESENT_MASK)) | |
192 | == (PT_WRITABLE_MASK | PT_PRESENT_MASK); | |
193 | } | |
194 | ||
e663ee64 AK |
195 | static void set_shadow_pte(u64 *sptep, u64 spte) |
196 | { | |
197 | #ifdef CONFIG_X86_64 | |
198 | set_64bit((unsigned long *)sptep, spte); | |
199 | #else | |
200 | set_64bit((unsigned long long *)sptep, spte); | |
201 | #endif | |
202 | } | |
203 | ||
e2dec939 | 204 | static int mmu_topup_memory_cache(struct kvm_mmu_memory_cache *cache, |
8c438502 AK |
205 | struct kmem_cache *base_cache, int min, |
206 | gfp_t gfp_flags) | |
714b93da AK |
207 | { |
208 | void *obj; | |
209 | ||
210 | if (cache->nobjs >= min) | |
e2dec939 | 211 | return 0; |
714b93da | 212 | while (cache->nobjs < ARRAY_SIZE(cache->objects)) { |
8c438502 | 213 | obj = kmem_cache_zalloc(base_cache, gfp_flags); |
714b93da | 214 | if (!obj) |
e2dec939 | 215 | return -ENOMEM; |
714b93da AK |
216 | cache->objects[cache->nobjs++] = obj; |
217 | } | |
e2dec939 | 218 | return 0; |
714b93da AK |
219 | } |
220 | ||
221 | static void mmu_free_memory_cache(struct kvm_mmu_memory_cache *mc) | |
222 | { | |
223 | while (mc->nobjs) | |
224 | kfree(mc->objects[--mc->nobjs]); | |
225 | } | |
226 | ||
c1158e63 AK |
227 | static int mmu_topup_memory_cache_page(struct kvm_mmu_memory_cache *cache, |
228 | int min, gfp_t gfp_flags) | |
229 | { | |
230 | struct page *page; | |
231 | ||
232 | if (cache->nobjs >= min) | |
233 | return 0; | |
234 | while (cache->nobjs < ARRAY_SIZE(cache->objects)) { | |
235 | page = alloc_page(gfp_flags); | |
236 | if (!page) | |
237 | return -ENOMEM; | |
238 | set_page_private(page, 0); | |
239 | cache->objects[cache->nobjs++] = page_address(page); | |
240 | } | |
241 | return 0; | |
242 | } | |
243 | ||
244 | static void mmu_free_memory_cache_page(struct kvm_mmu_memory_cache *mc) | |
245 | { | |
246 | while (mc->nobjs) | |
247 | __free_page(mc->objects[--mc->nobjs]); | |
248 | } | |
249 | ||
8c438502 | 250 | static int __mmu_topup_memory_caches(struct kvm_vcpu *vcpu, gfp_t gfp_flags) |
714b93da | 251 | { |
e2dec939 AK |
252 | int r; |
253 | ||
254 | r = mmu_topup_memory_cache(&vcpu->mmu_pte_chain_cache, | |
8c438502 | 255 | pte_chain_cache, 4, gfp_flags); |
e2dec939 AK |
256 | if (r) |
257 | goto out; | |
258 | r = mmu_topup_memory_cache(&vcpu->mmu_rmap_desc_cache, | |
8c438502 | 259 | rmap_desc_cache, 1, gfp_flags); |
d3d25b04 AK |
260 | if (r) |
261 | goto out; | |
c1158e63 | 262 | r = mmu_topup_memory_cache_page(&vcpu->mmu_page_cache, 4, gfp_flags); |
d3d25b04 AK |
263 | if (r) |
264 | goto out; | |
265 | r = mmu_topup_memory_cache(&vcpu->mmu_page_header_cache, | |
266 | mmu_page_header_cache, 4, gfp_flags); | |
e2dec939 AK |
267 | out: |
268 | return r; | |
714b93da AK |
269 | } |
270 | ||
8c438502 AK |
271 | static int mmu_topup_memory_caches(struct kvm_vcpu *vcpu) |
272 | { | |
273 | int r; | |
274 | ||
275 | r = __mmu_topup_memory_caches(vcpu, GFP_NOWAIT); | |
276 | if (r < 0) { | |
277 | spin_unlock(&vcpu->kvm->lock); | |
278 | kvm_arch_ops->vcpu_put(vcpu); | |
279 | r = __mmu_topup_memory_caches(vcpu, GFP_KERNEL); | |
280 | kvm_arch_ops->vcpu_load(vcpu); | |
281 | spin_lock(&vcpu->kvm->lock); | |
282 | } | |
283 | return r; | |
284 | } | |
285 | ||
714b93da AK |
286 | static void mmu_free_memory_caches(struct kvm_vcpu *vcpu) |
287 | { | |
288 | mmu_free_memory_cache(&vcpu->mmu_pte_chain_cache); | |
289 | mmu_free_memory_cache(&vcpu->mmu_rmap_desc_cache); | |
c1158e63 | 290 | mmu_free_memory_cache_page(&vcpu->mmu_page_cache); |
d3d25b04 | 291 | mmu_free_memory_cache(&vcpu->mmu_page_header_cache); |
714b93da AK |
292 | } |
293 | ||
294 | static void *mmu_memory_cache_alloc(struct kvm_mmu_memory_cache *mc, | |
295 | size_t size) | |
296 | { | |
297 | void *p; | |
298 | ||
299 | BUG_ON(!mc->nobjs); | |
300 | p = mc->objects[--mc->nobjs]; | |
301 | memset(p, 0, size); | |
302 | return p; | |
303 | } | |
304 | ||
714b93da AK |
305 | static struct kvm_pte_chain *mmu_alloc_pte_chain(struct kvm_vcpu *vcpu) |
306 | { | |
307 | return mmu_memory_cache_alloc(&vcpu->mmu_pte_chain_cache, | |
308 | sizeof(struct kvm_pte_chain)); | |
309 | } | |
310 | ||
90cb0529 | 311 | static void mmu_free_pte_chain(struct kvm_pte_chain *pc) |
714b93da | 312 | { |
90cb0529 | 313 | kfree(pc); |
714b93da AK |
314 | } |
315 | ||
316 | static struct kvm_rmap_desc *mmu_alloc_rmap_desc(struct kvm_vcpu *vcpu) | |
317 | { | |
318 | return mmu_memory_cache_alloc(&vcpu->mmu_rmap_desc_cache, | |
319 | sizeof(struct kvm_rmap_desc)); | |
320 | } | |
321 | ||
90cb0529 | 322 | static void mmu_free_rmap_desc(struct kvm_rmap_desc *rd) |
714b93da | 323 | { |
90cb0529 | 324 | kfree(rd); |
714b93da AK |
325 | } |
326 | ||
cd4a4e53 AK |
327 | /* |
328 | * Reverse mapping data structures: | |
329 | * | |
330 | * If page->private bit zero is zero, then page->private points to the | |
331 | * shadow page table entry that points to page_address(page). | |
332 | * | |
333 | * If page->private bit zero is one, (then page->private & ~1) points | |
334 | * to a struct kvm_rmap_desc containing more mappings. | |
335 | */ | |
714b93da | 336 | static void rmap_add(struct kvm_vcpu *vcpu, u64 *spte) |
cd4a4e53 AK |
337 | { |
338 | struct page *page; | |
339 | struct kvm_rmap_desc *desc; | |
340 | int i; | |
341 | ||
342 | if (!is_rmap_pte(*spte)) | |
343 | return; | |
344 | page = pfn_to_page((*spte & PT64_BASE_ADDR_MASK) >> PAGE_SHIFT); | |
5972e953 | 345 | if (!page_private(page)) { |
cd4a4e53 | 346 | rmap_printk("rmap_add: %p %llx 0->1\n", spte, *spte); |
5972e953 MR |
347 | set_page_private(page,(unsigned long)spte); |
348 | } else if (!(page_private(page) & 1)) { | |
cd4a4e53 | 349 | rmap_printk("rmap_add: %p %llx 1->many\n", spte, *spte); |
714b93da | 350 | desc = mmu_alloc_rmap_desc(vcpu); |
5972e953 | 351 | desc->shadow_ptes[0] = (u64 *)page_private(page); |
cd4a4e53 | 352 | desc->shadow_ptes[1] = spte; |
5972e953 | 353 | set_page_private(page,(unsigned long)desc | 1); |
cd4a4e53 AK |
354 | } else { |
355 | rmap_printk("rmap_add: %p %llx many->many\n", spte, *spte); | |
5972e953 | 356 | desc = (struct kvm_rmap_desc *)(page_private(page) & ~1ul); |
cd4a4e53 AK |
357 | while (desc->shadow_ptes[RMAP_EXT-1] && desc->more) |
358 | desc = desc->more; | |
359 | if (desc->shadow_ptes[RMAP_EXT-1]) { | |
714b93da | 360 | desc->more = mmu_alloc_rmap_desc(vcpu); |
cd4a4e53 AK |
361 | desc = desc->more; |
362 | } | |
363 | for (i = 0; desc->shadow_ptes[i]; ++i) | |
364 | ; | |
365 | desc->shadow_ptes[i] = spte; | |
366 | } | |
367 | } | |
368 | ||
90cb0529 | 369 | static void rmap_desc_remove_entry(struct page *page, |
cd4a4e53 AK |
370 | struct kvm_rmap_desc *desc, |
371 | int i, | |
372 | struct kvm_rmap_desc *prev_desc) | |
373 | { | |
374 | int j; | |
375 | ||
376 | for (j = RMAP_EXT - 1; !desc->shadow_ptes[j] && j > i; --j) | |
377 | ; | |
378 | desc->shadow_ptes[i] = desc->shadow_ptes[j]; | |
11718b4d | 379 | desc->shadow_ptes[j] = NULL; |
cd4a4e53 AK |
380 | if (j != 0) |
381 | return; | |
382 | if (!prev_desc && !desc->more) | |
5972e953 | 383 | set_page_private(page,(unsigned long)desc->shadow_ptes[0]); |
cd4a4e53 AK |
384 | else |
385 | if (prev_desc) | |
386 | prev_desc->more = desc->more; | |
387 | else | |
5972e953 | 388 | set_page_private(page,(unsigned long)desc->more | 1); |
90cb0529 | 389 | mmu_free_rmap_desc(desc); |
cd4a4e53 AK |
390 | } |
391 | ||
90cb0529 | 392 | static void rmap_remove(u64 *spte) |
cd4a4e53 AK |
393 | { |
394 | struct page *page; | |
395 | struct kvm_rmap_desc *desc; | |
396 | struct kvm_rmap_desc *prev_desc; | |
397 | int i; | |
398 | ||
399 | if (!is_rmap_pte(*spte)) | |
400 | return; | |
401 | page = pfn_to_page((*spte & PT64_BASE_ADDR_MASK) >> PAGE_SHIFT); | |
5972e953 | 402 | if (!page_private(page)) { |
cd4a4e53 AK |
403 | printk(KERN_ERR "rmap_remove: %p %llx 0->BUG\n", spte, *spte); |
404 | BUG(); | |
5972e953 | 405 | } else if (!(page_private(page) & 1)) { |
cd4a4e53 | 406 | rmap_printk("rmap_remove: %p %llx 1->0\n", spte, *spte); |
5972e953 | 407 | if ((u64 *)page_private(page) != spte) { |
cd4a4e53 AK |
408 | printk(KERN_ERR "rmap_remove: %p %llx 1->BUG\n", |
409 | spte, *spte); | |
410 | BUG(); | |
411 | } | |
5972e953 | 412 | set_page_private(page,0); |
cd4a4e53 AK |
413 | } else { |
414 | rmap_printk("rmap_remove: %p %llx many->many\n", spte, *spte); | |
5972e953 | 415 | desc = (struct kvm_rmap_desc *)(page_private(page) & ~1ul); |
cd4a4e53 AK |
416 | prev_desc = NULL; |
417 | while (desc) { | |
418 | for (i = 0; i < RMAP_EXT && desc->shadow_ptes[i]; ++i) | |
419 | if (desc->shadow_ptes[i] == spte) { | |
90cb0529 | 420 | rmap_desc_remove_entry(page, |
714b93da | 421 | desc, i, |
cd4a4e53 AK |
422 | prev_desc); |
423 | return; | |
424 | } | |
425 | prev_desc = desc; | |
426 | desc = desc->more; | |
427 | } | |
428 | BUG(); | |
429 | } | |
430 | } | |
431 | ||
714b93da | 432 | static void rmap_write_protect(struct kvm_vcpu *vcpu, u64 gfn) |
374cbac0 | 433 | { |
714b93da | 434 | struct kvm *kvm = vcpu->kvm; |
374cbac0 | 435 | struct page *page; |
374cbac0 AK |
436 | struct kvm_rmap_desc *desc; |
437 | u64 *spte; | |
438 | ||
954bbbc2 AK |
439 | page = gfn_to_page(kvm, gfn); |
440 | BUG_ON(!page); | |
374cbac0 | 441 | |
5972e953 MR |
442 | while (page_private(page)) { |
443 | if (!(page_private(page) & 1)) | |
444 | spte = (u64 *)page_private(page); | |
374cbac0 | 445 | else { |
5972e953 | 446 | desc = (struct kvm_rmap_desc *)(page_private(page) & ~1ul); |
374cbac0 AK |
447 | spte = desc->shadow_ptes[0]; |
448 | } | |
449 | BUG_ON(!spte); | |
27aba766 AK |
450 | BUG_ON((*spte & PT64_BASE_ADDR_MASK) >> PAGE_SHIFT |
451 | != page_to_pfn(page)); | |
374cbac0 AK |
452 | BUG_ON(!(*spte & PT_PRESENT_MASK)); |
453 | BUG_ON(!(*spte & PT_WRITABLE_MASK)); | |
454 | rmap_printk("rmap_write_protect: spte %p %llx\n", spte, *spte); | |
90cb0529 | 455 | rmap_remove(spte); |
e663ee64 | 456 | set_shadow_pte(spte, *spte & ~PT_WRITABLE_MASK); |
88a97f0b | 457 | kvm_flush_remote_tlbs(vcpu->kvm); |
374cbac0 AK |
458 | } |
459 | } | |
460 | ||
d6c69ee9 | 461 | #ifdef MMU_DEBUG |
47ad8e68 | 462 | static int is_empty_shadow_page(u64 *spt) |
6aa8b732 | 463 | { |
139bdb2d AK |
464 | u64 *pos; |
465 | u64 *end; | |
466 | ||
47ad8e68 | 467 | for (pos = spt, end = pos + PAGE_SIZE / sizeof(u64); pos != end; pos++) |
139bdb2d AK |
468 | if (*pos != 0) { |
469 | printk(KERN_ERR "%s: %p %llx\n", __FUNCTION__, | |
470 | pos, *pos); | |
6aa8b732 | 471 | return 0; |
139bdb2d | 472 | } |
6aa8b732 AK |
473 | return 1; |
474 | } | |
d6c69ee9 | 475 | #endif |
6aa8b732 | 476 | |
90cb0529 | 477 | static void kvm_mmu_free_page(struct kvm *kvm, |
4b02d6da | 478 | struct kvm_mmu_page *page_head) |
260746c0 | 479 | { |
47ad8e68 | 480 | ASSERT(is_empty_shadow_page(page_head->spt)); |
d3d25b04 | 481 | list_del(&page_head->link); |
c1158e63 | 482 | __free_page(virt_to_page(page_head->spt)); |
90cb0529 AK |
483 | kfree(page_head); |
484 | ++kvm->n_free_mmu_pages; | |
260746c0 AK |
485 | } |
486 | ||
cea0f0e7 AK |
487 | static unsigned kvm_page_table_hashfn(gfn_t gfn) |
488 | { | |
489 | return gfn; | |
490 | } | |
491 | ||
25c0de2c AK |
492 | static struct kvm_mmu_page *kvm_mmu_alloc_page(struct kvm_vcpu *vcpu, |
493 | u64 *parent_pte) | |
6aa8b732 AK |
494 | { |
495 | struct kvm_mmu_page *page; | |
496 | ||
d3d25b04 | 497 | if (!vcpu->kvm->n_free_mmu_pages) |
25c0de2c | 498 | return NULL; |
6aa8b732 | 499 | |
d3d25b04 AK |
500 | page = mmu_memory_cache_alloc(&vcpu->mmu_page_header_cache, |
501 | sizeof *page); | |
502 | page->spt = mmu_memory_cache_alloc(&vcpu->mmu_page_cache, PAGE_SIZE); | |
503 | set_page_private(virt_to_page(page->spt), (unsigned long)page); | |
504 | list_add(&page->link, &vcpu->kvm->active_mmu_pages); | |
47ad8e68 | 505 | ASSERT(is_empty_shadow_page(page->spt)); |
6aa8b732 | 506 | page->slot_bitmap = 0; |
cea0f0e7 | 507 | page->multimapped = 0; |
6aa8b732 | 508 | page->parent_pte = parent_pte; |
ebeace86 | 509 | --vcpu->kvm->n_free_mmu_pages; |
25c0de2c | 510 | return page; |
6aa8b732 AK |
511 | } |
512 | ||
714b93da AK |
513 | static void mmu_page_add_parent_pte(struct kvm_vcpu *vcpu, |
514 | struct kvm_mmu_page *page, u64 *parent_pte) | |
cea0f0e7 AK |
515 | { |
516 | struct kvm_pte_chain *pte_chain; | |
517 | struct hlist_node *node; | |
518 | int i; | |
519 | ||
520 | if (!parent_pte) | |
521 | return; | |
522 | if (!page->multimapped) { | |
523 | u64 *old = page->parent_pte; | |
524 | ||
525 | if (!old) { | |
526 | page->parent_pte = parent_pte; | |
527 | return; | |
528 | } | |
529 | page->multimapped = 1; | |
714b93da | 530 | pte_chain = mmu_alloc_pte_chain(vcpu); |
cea0f0e7 AK |
531 | INIT_HLIST_HEAD(&page->parent_ptes); |
532 | hlist_add_head(&pte_chain->link, &page->parent_ptes); | |
533 | pte_chain->parent_ptes[0] = old; | |
534 | } | |
535 | hlist_for_each_entry(pte_chain, node, &page->parent_ptes, link) { | |
536 | if (pte_chain->parent_ptes[NR_PTE_CHAIN_ENTRIES-1]) | |
537 | continue; | |
538 | for (i = 0; i < NR_PTE_CHAIN_ENTRIES; ++i) | |
539 | if (!pte_chain->parent_ptes[i]) { | |
540 | pte_chain->parent_ptes[i] = parent_pte; | |
541 | return; | |
542 | } | |
543 | } | |
714b93da | 544 | pte_chain = mmu_alloc_pte_chain(vcpu); |
cea0f0e7 AK |
545 | BUG_ON(!pte_chain); |
546 | hlist_add_head(&pte_chain->link, &page->parent_ptes); | |
547 | pte_chain->parent_ptes[0] = parent_pte; | |
548 | } | |
549 | ||
90cb0529 | 550 | static void mmu_page_remove_parent_pte(struct kvm_mmu_page *page, |
cea0f0e7 AK |
551 | u64 *parent_pte) |
552 | { | |
553 | struct kvm_pte_chain *pte_chain; | |
554 | struct hlist_node *node; | |
555 | int i; | |
556 | ||
557 | if (!page->multimapped) { | |
558 | BUG_ON(page->parent_pte != parent_pte); | |
559 | page->parent_pte = NULL; | |
560 | return; | |
561 | } | |
562 | hlist_for_each_entry(pte_chain, node, &page->parent_ptes, link) | |
563 | for (i = 0; i < NR_PTE_CHAIN_ENTRIES; ++i) { | |
564 | if (!pte_chain->parent_ptes[i]) | |
565 | break; | |
566 | if (pte_chain->parent_ptes[i] != parent_pte) | |
567 | continue; | |
697fe2e2 AK |
568 | while (i + 1 < NR_PTE_CHAIN_ENTRIES |
569 | && pte_chain->parent_ptes[i + 1]) { | |
cea0f0e7 AK |
570 | pte_chain->parent_ptes[i] |
571 | = pte_chain->parent_ptes[i + 1]; | |
572 | ++i; | |
573 | } | |
574 | pte_chain->parent_ptes[i] = NULL; | |
697fe2e2 AK |
575 | if (i == 0) { |
576 | hlist_del(&pte_chain->link); | |
90cb0529 | 577 | mmu_free_pte_chain(pte_chain); |
697fe2e2 AK |
578 | if (hlist_empty(&page->parent_ptes)) { |
579 | page->multimapped = 0; | |
580 | page->parent_pte = NULL; | |
581 | } | |
582 | } | |
cea0f0e7 AK |
583 | return; |
584 | } | |
585 | BUG(); | |
586 | } | |
587 | ||
588 | static struct kvm_mmu_page *kvm_mmu_lookup_page(struct kvm_vcpu *vcpu, | |
589 | gfn_t gfn) | |
590 | { | |
591 | unsigned index; | |
592 | struct hlist_head *bucket; | |
593 | struct kvm_mmu_page *page; | |
594 | struct hlist_node *node; | |
595 | ||
596 | pgprintk("%s: looking for gfn %lx\n", __FUNCTION__, gfn); | |
597 | index = kvm_page_table_hashfn(gfn) % KVM_NUM_MMU_PAGES; | |
598 | bucket = &vcpu->kvm->mmu_page_hash[index]; | |
599 | hlist_for_each_entry(page, node, bucket, hash_link) | |
600 | if (page->gfn == gfn && !page->role.metaphysical) { | |
601 | pgprintk("%s: found role %x\n", | |
602 | __FUNCTION__, page->role.word); | |
603 | return page; | |
604 | } | |
605 | return NULL; | |
606 | } | |
607 | ||
608 | static struct kvm_mmu_page *kvm_mmu_get_page(struct kvm_vcpu *vcpu, | |
609 | gfn_t gfn, | |
610 | gva_t gaddr, | |
611 | unsigned level, | |
612 | int metaphysical, | |
d28c6cfb | 613 | unsigned hugepage_access, |
cea0f0e7 AK |
614 | u64 *parent_pte) |
615 | { | |
616 | union kvm_mmu_page_role role; | |
617 | unsigned index; | |
618 | unsigned quadrant; | |
619 | struct hlist_head *bucket; | |
620 | struct kvm_mmu_page *page; | |
621 | struct hlist_node *node; | |
622 | ||
623 | role.word = 0; | |
624 | role.glevels = vcpu->mmu.root_level; | |
625 | role.level = level; | |
626 | role.metaphysical = metaphysical; | |
d28c6cfb | 627 | role.hugepage_access = hugepage_access; |
cea0f0e7 AK |
628 | if (vcpu->mmu.root_level <= PT32_ROOT_LEVEL) { |
629 | quadrant = gaddr >> (PAGE_SHIFT + (PT64_PT_BITS * level)); | |
630 | quadrant &= (1 << ((PT32_PT_BITS - PT64_PT_BITS) * level)) - 1; | |
631 | role.quadrant = quadrant; | |
632 | } | |
633 | pgprintk("%s: looking gfn %lx role %x\n", __FUNCTION__, | |
634 | gfn, role.word); | |
635 | index = kvm_page_table_hashfn(gfn) % KVM_NUM_MMU_PAGES; | |
636 | bucket = &vcpu->kvm->mmu_page_hash[index]; | |
637 | hlist_for_each_entry(page, node, bucket, hash_link) | |
638 | if (page->gfn == gfn && page->role.word == role.word) { | |
714b93da | 639 | mmu_page_add_parent_pte(vcpu, page, parent_pte); |
cea0f0e7 AK |
640 | pgprintk("%s: found\n", __FUNCTION__); |
641 | return page; | |
642 | } | |
643 | page = kvm_mmu_alloc_page(vcpu, parent_pte); | |
644 | if (!page) | |
645 | return page; | |
646 | pgprintk("%s: adding gfn %lx role %x\n", __FUNCTION__, gfn, role.word); | |
647 | page->gfn = gfn; | |
648 | page->role = role; | |
649 | hlist_add_head(&page->hash_link, bucket); | |
374cbac0 | 650 | if (!metaphysical) |
714b93da | 651 | rmap_write_protect(vcpu, gfn); |
cea0f0e7 AK |
652 | return page; |
653 | } | |
654 | ||
90cb0529 | 655 | static void kvm_mmu_page_unlink_children(struct kvm *kvm, |
a436036b AK |
656 | struct kvm_mmu_page *page) |
657 | { | |
697fe2e2 AK |
658 | unsigned i; |
659 | u64 *pt; | |
660 | u64 ent; | |
661 | ||
47ad8e68 | 662 | pt = page->spt; |
697fe2e2 AK |
663 | |
664 | if (page->role.level == PT_PAGE_TABLE_LEVEL) { | |
665 | for (i = 0; i < PT64_ENT_PER_PAGE; ++i) { | |
666 | if (pt[i] & PT_PRESENT_MASK) | |
90cb0529 | 667 | rmap_remove(&pt[i]); |
697fe2e2 AK |
668 | pt[i] = 0; |
669 | } | |
90cb0529 | 670 | kvm_flush_remote_tlbs(kvm); |
697fe2e2 AK |
671 | return; |
672 | } | |
673 | ||
674 | for (i = 0; i < PT64_ENT_PER_PAGE; ++i) { | |
675 | ent = pt[i]; | |
676 | ||
677 | pt[i] = 0; | |
678 | if (!(ent & PT_PRESENT_MASK)) | |
679 | continue; | |
680 | ent &= PT64_BASE_ADDR_MASK; | |
90cb0529 | 681 | mmu_page_remove_parent_pte(page_header(ent), &pt[i]); |
697fe2e2 | 682 | } |
90cb0529 | 683 | kvm_flush_remote_tlbs(kvm); |
a436036b AK |
684 | } |
685 | ||
90cb0529 | 686 | static void kvm_mmu_put_page(struct kvm_mmu_page *page, |
cea0f0e7 AK |
687 | u64 *parent_pte) |
688 | { | |
90cb0529 | 689 | mmu_page_remove_parent_pte(page, parent_pte); |
a436036b AK |
690 | } |
691 | ||
90cb0529 | 692 | static void kvm_mmu_zap_page(struct kvm *kvm, |
a436036b AK |
693 | struct kvm_mmu_page *page) |
694 | { | |
695 | u64 *parent_pte; | |
696 | ||
697 | while (page->multimapped || page->parent_pte) { | |
698 | if (!page->multimapped) | |
699 | parent_pte = page->parent_pte; | |
700 | else { | |
701 | struct kvm_pte_chain *chain; | |
702 | ||
703 | chain = container_of(page->parent_ptes.first, | |
704 | struct kvm_pte_chain, link); | |
705 | parent_pte = chain->parent_ptes[0]; | |
706 | } | |
697fe2e2 | 707 | BUG_ON(!parent_pte); |
90cb0529 | 708 | kvm_mmu_put_page(page, parent_pte); |
e663ee64 | 709 | set_shadow_pte(parent_pte, 0); |
a436036b | 710 | } |
90cb0529 | 711 | kvm_mmu_page_unlink_children(kvm, page); |
3bb65a22 AK |
712 | if (!page->root_count) { |
713 | hlist_del(&page->hash_link); | |
90cb0529 | 714 | kvm_mmu_free_page(kvm, page); |
36868f7b | 715 | } else |
90cb0529 | 716 | list_move(&page->link, &kvm->active_mmu_pages); |
a436036b AK |
717 | } |
718 | ||
719 | static int kvm_mmu_unprotect_page(struct kvm_vcpu *vcpu, gfn_t gfn) | |
720 | { | |
721 | unsigned index; | |
722 | struct hlist_head *bucket; | |
723 | struct kvm_mmu_page *page; | |
724 | struct hlist_node *node, *n; | |
725 | int r; | |
726 | ||
727 | pgprintk("%s: looking for gfn %lx\n", __FUNCTION__, gfn); | |
728 | r = 0; | |
729 | index = kvm_page_table_hashfn(gfn) % KVM_NUM_MMU_PAGES; | |
730 | bucket = &vcpu->kvm->mmu_page_hash[index]; | |
731 | hlist_for_each_entry_safe(page, node, n, bucket, hash_link) | |
732 | if (page->gfn == gfn && !page->role.metaphysical) { | |
697fe2e2 AK |
733 | pgprintk("%s: gfn %lx role %x\n", __FUNCTION__, gfn, |
734 | page->role.word); | |
90cb0529 | 735 | kvm_mmu_zap_page(vcpu->kvm, page); |
a436036b AK |
736 | r = 1; |
737 | } | |
738 | return r; | |
cea0f0e7 AK |
739 | } |
740 | ||
97a0a01e AK |
741 | static void mmu_unshadow(struct kvm_vcpu *vcpu, gfn_t gfn) |
742 | { | |
743 | struct kvm_mmu_page *page; | |
744 | ||
745 | while ((page = kvm_mmu_lookup_page(vcpu, gfn)) != NULL) { | |
746 | pgprintk("%s: zap %lx %x\n", | |
747 | __FUNCTION__, gfn, page->role.word); | |
90cb0529 | 748 | kvm_mmu_zap_page(vcpu->kvm, page); |
97a0a01e AK |
749 | } |
750 | } | |
751 | ||
6aa8b732 AK |
752 | static void page_header_update_slot(struct kvm *kvm, void *pte, gpa_t gpa) |
753 | { | |
754 | int slot = memslot_id(kvm, gfn_to_memslot(kvm, gpa >> PAGE_SHIFT)); | |
755 | struct kvm_mmu_page *page_head = page_header(__pa(pte)); | |
756 | ||
757 | __set_bit(slot, &page_head->slot_bitmap); | |
758 | } | |
759 | ||
760 | hpa_t safe_gpa_to_hpa(struct kvm_vcpu *vcpu, gpa_t gpa) | |
761 | { | |
762 | hpa_t hpa = gpa_to_hpa(vcpu, gpa); | |
763 | ||
764 | return is_error_hpa(hpa) ? bad_page_address | (gpa & ~PAGE_MASK): hpa; | |
765 | } | |
766 | ||
767 | hpa_t gpa_to_hpa(struct kvm_vcpu *vcpu, gpa_t gpa) | |
768 | { | |
6aa8b732 AK |
769 | struct page *page; |
770 | ||
771 | ASSERT((gpa & HPA_ERR_MASK) == 0); | |
954bbbc2 AK |
772 | page = gfn_to_page(vcpu->kvm, gpa >> PAGE_SHIFT); |
773 | if (!page) | |
6aa8b732 | 774 | return gpa | HPA_ERR_MASK; |
6aa8b732 AK |
775 | return ((hpa_t)page_to_pfn(page) << PAGE_SHIFT) |
776 | | (gpa & (PAGE_SIZE-1)); | |
777 | } | |
778 | ||
779 | hpa_t gva_to_hpa(struct kvm_vcpu *vcpu, gva_t gva) | |
780 | { | |
781 | gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, gva); | |
782 | ||
783 | if (gpa == UNMAPPED_GVA) | |
784 | return UNMAPPED_GVA; | |
785 | return gpa_to_hpa(vcpu, gpa); | |
786 | } | |
787 | ||
039576c0 AK |
788 | struct page *gva_to_page(struct kvm_vcpu *vcpu, gva_t gva) |
789 | { | |
790 | gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, gva); | |
791 | ||
792 | if (gpa == UNMAPPED_GVA) | |
793 | return NULL; | |
794 | return pfn_to_page(gpa_to_hpa(vcpu, gpa) >> PAGE_SHIFT); | |
795 | } | |
796 | ||
6aa8b732 AK |
797 | static void nonpaging_new_cr3(struct kvm_vcpu *vcpu) |
798 | { | |
799 | } | |
800 | ||
801 | static int nonpaging_map(struct kvm_vcpu *vcpu, gva_t v, hpa_t p) | |
802 | { | |
803 | int level = PT32E_ROOT_LEVEL; | |
804 | hpa_t table_addr = vcpu->mmu.root_hpa; | |
805 | ||
806 | for (; ; level--) { | |
807 | u32 index = PT64_INDEX(v, level); | |
808 | u64 *table; | |
cea0f0e7 | 809 | u64 pte; |
6aa8b732 AK |
810 | |
811 | ASSERT(VALID_PAGE(table_addr)); | |
812 | table = __va(table_addr); | |
813 | ||
814 | if (level == 1) { | |
cea0f0e7 AK |
815 | pte = table[index]; |
816 | if (is_present_pte(pte) && is_writeble_pte(pte)) | |
817 | return 0; | |
6aa8b732 AK |
818 | mark_page_dirty(vcpu->kvm, v >> PAGE_SHIFT); |
819 | page_header_update_slot(vcpu->kvm, table, v); | |
820 | table[index] = p | PT_PRESENT_MASK | PT_WRITABLE_MASK | | |
821 | PT_USER_MASK; | |
714b93da | 822 | rmap_add(vcpu, &table[index]); |
6aa8b732 AK |
823 | return 0; |
824 | } | |
825 | ||
826 | if (table[index] == 0) { | |
25c0de2c | 827 | struct kvm_mmu_page *new_table; |
cea0f0e7 | 828 | gfn_t pseudo_gfn; |
6aa8b732 | 829 | |
cea0f0e7 AK |
830 | pseudo_gfn = (v & PT64_DIR_BASE_ADDR_MASK) |
831 | >> PAGE_SHIFT; | |
832 | new_table = kvm_mmu_get_page(vcpu, pseudo_gfn, | |
833 | v, level - 1, | |
d28c6cfb | 834 | 1, 0, &table[index]); |
25c0de2c | 835 | if (!new_table) { |
6aa8b732 AK |
836 | pgprintk("nonpaging_map: ENOMEM\n"); |
837 | return -ENOMEM; | |
838 | } | |
839 | ||
47ad8e68 | 840 | table[index] = __pa(new_table->spt) | PT_PRESENT_MASK |
25c0de2c | 841 | | PT_WRITABLE_MASK | PT_USER_MASK; |
6aa8b732 AK |
842 | } |
843 | table_addr = table[index] & PT64_BASE_ADDR_MASK; | |
844 | } | |
845 | } | |
846 | ||
17ac10ad AK |
847 | static void mmu_free_roots(struct kvm_vcpu *vcpu) |
848 | { | |
849 | int i; | |
3bb65a22 | 850 | struct kvm_mmu_page *page; |
17ac10ad | 851 | |
7b53aa56 AK |
852 | if (!VALID_PAGE(vcpu->mmu.root_hpa)) |
853 | return; | |
17ac10ad AK |
854 | #ifdef CONFIG_X86_64 |
855 | if (vcpu->mmu.shadow_root_level == PT64_ROOT_LEVEL) { | |
856 | hpa_t root = vcpu->mmu.root_hpa; | |
857 | ||
3bb65a22 AK |
858 | page = page_header(root); |
859 | --page->root_count; | |
17ac10ad AK |
860 | vcpu->mmu.root_hpa = INVALID_PAGE; |
861 | return; | |
862 | } | |
863 | #endif | |
864 | for (i = 0; i < 4; ++i) { | |
865 | hpa_t root = vcpu->mmu.pae_root[i]; | |
866 | ||
417726a3 | 867 | if (root) { |
417726a3 AK |
868 | root &= PT64_BASE_ADDR_MASK; |
869 | page = page_header(root); | |
870 | --page->root_count; | |
871 | } | |
17ac10ad AK |
872 | vcpu->mmu.pae_root[i] = INVALID_PAGE; |
873 | } | |
874 | vcpu->mmu.root_hpa = INVALID_PAGE; | |
875 | } | |
876 | ||
877 | static void mmu_alloc_roots(struct kvm_vcpu *vcpu) | |
878 | { | |
879 | int i; | |
cea0f0e7 | 880 | gfn_t root_gfn; |
3bb65a22 AK |
881 | struct kvm_mmu_page *page; |
882 | ||
cea0f0e7 | 883 | root_gfn = vcpu->cr3 >> PAGE_SHIFT; |
17ac10ad AK |
884 | |
885 | #ifdef CONFIG_X86_64 | |
886 | if (vcpu->mmu.shadow_root_level == PT64_ROOT_LEVEL) { | |
887 | hpa_t root = vcpu->mmu.root_hpa; | |
888 | ||
889 | ASSERT(!VALID_PAGE(root)); | |
68a99f6d | 890 | page = kvm_mmu_get_page(vcpu, root_gfn, 0, |
d28c6cfb | 891 | PT64_ROOT_LEVEL, 0, 0, NULL); |
47ad8e68 | 892 | root = __pa(page->spt); |
3bb65a22 | 893 | ++page->root_count; |
17ac10ad AK |
894 | vcpu->mmu.root_hpa = root; |
895 | return; | |
896 | } | |
897 | #endif | |
898 | for (i = 0; i < 4; ++i) { | |
899 | hpa_t root = vcpu->mmu.pae_root[i]; | |
900 | ||
901 | ASSERT(!VALID_PAGE(root)); | |
417726a3 AK |
902 | if (vcpu->mmu.root_level == PT32E_ROOT_LEVEL) { |
903 | if (!is_present_pte(vcpu->pdptrs[i])) { | |
904 | vcpu->mmu.pae_root[i] = 0; | |
905 | continue; | |
906 | } | |
cea0f0e7 | 907 | root_gfn = vcpu->pdptrs[i] >> PAGE_SHIFT; |
417726a3 | 908 | } else if (vcpu->mmu.root_level == 0) |
cea0f0e7 | 909 | root_gfn = 0; |
68a99f6d | 910 | page = kvm_mmu_get_page(vcpu, root_gfn, i << 30, |
cea0f0e7 | 911 | PT32_ROOT_LEVEL, !is_paging(vcpu), |
d28c6cfb | 912 | 0, NULL); |
47ad8e68 | 913 | root = __pa(page->spt); |
3bb65a22 | 914 | ++page->root_count; |
17ac10ad AK |
915 | vcpu->mmu.pae_root[i] = root | PT_PRESENT_MASK; |
916 | } | |
917 | vcpu->mmu.root_hpa = __pa(vcpu->mmu.pae_root); | |
918 | } | |
919 | ||
6aa8b732 AK |
920 | static gpa_t nonpaging_gva_to_gpa(struct kvm_vcpu *vcpu, gva_t vaddr) |
921 | { | |
922 | return vaddr; | |
923 | } | |
924 | ||
925 | static int nonpaging_page_fault(struct kvm_vcpu *vcpu, gva_t gva, | |
926 | u32 error_code) | |
927 | { | |
6aa8b732 | 928 | gpa_t addr = gva; |
ebeace86 | 929 | hpa_t paddr; |
e2dec939 | 930 | int r; |
6aa8b732 | 931 | |
e2dec939 AK |
932 | r = mmu_topup_memory_caches(vcpu); |
933 | if (r) | |
934 | return r; | |
714b93da | 935 | |
6aa8b732 AK |
936 | ASSERT(vcpu); |
937 | ASSERT(VALID_PAGE(vcpu->mmu.root_hpa)); | |
938 | ||
6aa8b732 | 939 | |
ebeace86 | 940 | paddr = gpa_to_hpa(vcpu , addr & PT64_BASE_ADDR_MASK); |
6aa8b732 | 941 | |
ebeace86 AK |
942 | if (is_error_hpa(paddr)) |
943 | return 1; | |
6aa8b732 | 944 | |
ebeace86 | 945 | return nonpaging_map(vcpu, addr & PAGE_MASK, paddr); |
6aa8b732 AK |
946 | } |
947 | ||
6aa8b732 AK |
948 | static void nonpaging_free(struct kvm_vcpu *vcpu) |
949 | { | |
17ac10ad | 950 | mmu_free_roots(vcpu); |
6aa8b732 AK |
951 | } |
952 | ||
953 | static int nonpaging_init_context(struct kvm_vcpu *vcpu) | |
954 | { | |
955 | struct kvm_mmu *context = &vcpu->mmu; | |
956 | ||
957 | context->new_cr3 = nonpaging_new_cr3; | |
958 | context->page_fault = nonpaging_page_fault; | |
6aa8b732 AK |
959 | context->gva_to_gpa = nonpaging_gva_to_gpa; |
960 | context->free = nonpaging_free; | |
cea0f0e7 | 961 | context->root_level = 0; |
6aa8b732 | 962 | context->shadow_root_level = PT32E_ROOT_LEVEL; |
17c3ba9d | 963 | context->root_hpa = INVALID_PAGE; |
6aa8b732 AK |
964 | return 0; |
965 | } | |
966 | ||
6aa8b732 AK |
967 | static void kvm_mmu_flush_tlb(struct kvm_vcpu *vcpu) |
968 | { | |
1165f5fe | 969 | ++vcpu->stat.tlb_flush; |
6aa8b732 AK |
970 | kvm_arch_ops->tlb_flush(vcpu); |
971 | } | |
972 | ||
973 | static void paging_new_cr3(struct kvm_vcpu *vcpu) | |
974 | { | |
374cbac0 | 975 | pgprintk("%s: cr3 %lx\n", __FUNCTION__, vcpu->cr3); |
cea0f0e7 | 976 | mmu_free_roots(vcpu); |
6aa8b732 AK |
977 | } |
978 | ||
6aa8b732 AK |
979 | static void inject_page_fault(struct kvm_vcpu *vcpu, |
980 | u64 addr, | |
981 | u32 err_code) | |
982 | { | |
983 | kvm_arch_ops->inject_page_fault(vcpu, addr, err_code); | |
984 | } | |
985 | ||
6aa8b732 AK |
986 | static void paging_free(struct kvm_vcpu *vcpu) |
987 | { | |
988 | nonpaging_free(vcpu); | |
989 | } | |
990 | ||
991 | #define PTTYPE 64 | |
992 | #include "paging_tmpl.h" | |
993 | #undef PTTYPE | |
994 | ||
995 | #define PTTYPE 32 | |
996 | #include "paging_tmpl.h" | |
997 | #undef PTTYPE | |
998 | ||
17ac10ad | 999 | static int paging64_init_context_common(struct kvm_vcpu *vcpu, int level) |
6aa8b732 AK |
1000 | { |
1001 | struct kvm_mmu *context = &vcpu->mmu; | |
1002 | ||
1003 | ASSERT(is_pae(vcpu)); | |
1004 | context->new_cr3 = paging_new_cr3; | |
1005 | context->page_fault = paging64_page_fault; | |
6aa8b732 AK |
1006 | context->gva_to_gpa = paging64_gva_to_gpa; |
1007 | context->free = paging_free; | |
17ac10ad AK |
1008 | context->root_level = level; |
1009 | context->shadow_root_level = level; | |
17c3ba9d | 1010 | context->root_hpa = INVALID_PAGE; |
6aa8b732 AK |
1011 | return 0; |
1012 | } | |
1013 | ||
17ac10ad AK |
1014 | static int paging64_init_context(struct kvm_vcpu *vcpu) |
1015 | { | |
1016 | return paging64_init_context_common(vcpu, PT64_ROOT_LEVEL); | |
1017 | } | |
1018 | ||
6aa8b732 AK |
1019 | static int paging32_init_context(struct kvm_vcpu *vcpu) |
1020 | { | |
1021 | struct kvm_mmu *context = &vcpu->mmu; | |
1022 | ||
1023 | context->new_cr3 = paging_new_cr3; | |
1024 | context->page_fault = paging32_page_fault; | |
6aa8b732 AK |
1025 | context->gva_to_gpa = paging32_gva_to_gpa; |
1026 | context->free = paging_free; | |
1027 | context->root_level = PT32_ROOT_LEVEL; | |
1028 | context->shadow_root_level = PT32E_ROOT_LEVEL; | |
17c3ba9d | 1029 | context->root_hpa = INVALID_PAGE; |
6aa8b732 AK |
1030 | return 0; |
1031 | } | |
1032 | ||
1033 | static int paging32E_init_context(struct kvm_vcpu *vcpu) | |
1034 | { | |
17ac10ad | 1035 | return paging64_init_context_common(vcpu, PT32E_ROOT_LEVEL); |
6aa8b732 AK |
1036 | } |
1037 | ||
1038 | static int init_kvm_mmu(struct kvm_vcpu *vcpu) | |
1039 | { | |
1040 | ASSERT(vcpu); | |
1041 | ASSERT(!VALID_PAGE(vcpu->mmu.root_hpa)); | |
1042 | ||
1043 | if (!is_paging(vcpu)) | |
1044 | return nonpaging_init_context(vcpu); | |
a9058ecd | 1045 | else if (is_long_mode(vcpu)) |
6aa8b732 AK |
1046 | return paging64_init_context(vcpu); |
1047 | else if (is_pae(vcpu)) | |
1048 | return paging32E_init_context(vcpu); | |
1049 | else | |
1050 | return paging32_init_context(vcpu); | |
1051 | } | |
1052 | ||
1053 | static void destroy_kvm_mmu(struct kvm_vcpu *vcpu) | |
1054 | { | |
1055 | ASSERT(vcpu); | |
1056 | if (VALID_PAGE(vcpu->mmu.root_hpa)) { | |
1057 | vcpu->mmu.free(vcpu); | |
1058 | vcpu->mmu.root_hpa = INVALID_PAGE; | |
1059 | } | |
1060 | } | |
1061 | ||
1062 | int kvm_mmu_reset_context(struct kvm_vcpu *vcpu) | |
17c3ba9d AK |
1063 | { |
1064 | destroy_kvm_mmu(vcpu); | |
1065 | return init_kvm_mmu(vcpu); | |
1066 | } | |
1067 | ||
1068 | int kvm_mmu_load(struct kvm_vcpu *vcpu) | |
6aa8b732 | 1069 | { |
714b93da AK |
1070 | int r; |
1071 | ||
17c3ba9d | 1072 | spin_lock(&vcpu->kvm->lock); |
e2dec939 | 1073 | r = mmu_topup_memory_caches(vcpu); |
17c3ba9d AK |
1074 | if (r) |
1075 | goto out; | |
1076 | mmu_alloc_roots(vcpu); | |
1077 | kvm_arch_ops->set_cr3(vcpu, vcpu->mmu.root_hpa); | |
1078 | kvm_mmu_flush_tlb(vcpu); | |
714b93da | 1079 | out: |
17c3ba9d | 1080 | spin_unlock(&vcpu->kvm->lock); |
714b93da | 1081 | return r; |
6aa8b732 | 1082 | } |
17c3ba9d AK |
1083 | EXPORT_SYMBOL_GPL(kvm_mmu_load); |
1084 | ||
1085 | void kvm_mmu_unload(struct kvm_vcpu *vcpu) | |
1086 | { | |
1087 | mmu_free_roots(vcpu); | |
1088 | } | |
6aa8b732 | 1089 | |
09072daf | 1090 | static void mmu_pte_write_zap_pte(struct kvm_vcpu *vcpu, |
ac1b714e AK |
1091 | struct kvm_mmu_page *page, |
1092 | u64 *spte) | |
1093 | { | |
1094 | u64 pte; | |
1095 | struct kvm_mmu_page *child; | |
1096 | ||
1097 | pte = *spte; | |
1098 | if (is_present_pte(pte)) { | |
1099 | if (page->role.level == PT_PAGE_TABLE_LEVEL) | |
90cb0529 | 1100 | rmap_remove(spte); |
ac1b714e AK |
1101 | else { |
1102 | child = page_header(pte & PT64_BASE_ADDR_MASK); | |
90cb0529 | 1103 | mmu_page_remove_parent_pte(child, spte); |
ac1b714e AK |
1104 | } |
1105 | } | |
1106 | *spte = 0; | |
d9e368d6 | 1107 | kvm_flush_remote_tlbs(vcpu->kvm); |
ac1b714e AK |
1108 | } |
1109 | ||
0028425f AK |
1110 | static void mmu_pte_write_new_pte(struct kvm_vcpu *vcpu, |
1111 | struct kvm_mmu_page *page, | |
1112 | u64 *spte, | |
1113 | const void *new, int bytes) | |
1114 | { | |
1115 | if (page->role.level != PT_PAGE_TABLE_LEVEL) | |
1116 | return; | |
1117 | ||
1118 | if (page->role.glevels == PT32_ROOT_LEVEL) | |
1119 | paging32_update_pte(vcpu, page, spte, new, bytes); | |
1120 | else | |
1121 | paging64_update_pte(vcpu, page, spte, new, bytes); | |
1122 | } | |
1123 | ||
09072daf AK |
1124 | void kvm_mmu_pte_write(struct kvm_vcpu *vcpu, gpa_t gpa, |
1125 | const u8 *old, const u8 *new, int bytes) | |
da4a00f0 | 1126 | { |
9b7a0325 AK |
1127 | gfn_t gfn = gpa >> PAGE_SHIFT; |
1128 | struct kvm_mmu_page *page; | |
0e7bc4b9 | 1129 | struct hlist_node *node, *n; |
9b7a0325 AK |
1130 | struct hlist_head *bucket; |
1131 | unsigned index; | |
1132 | u64 *spte; | |
9b7a0325 | 1133 | unsigned offset = offset_in_page(gpa); |
0e7bc4b9 | 1134 | unsigned pte_size; |
9b7a0325 | 1135 | unsigned page_offset; |
0e7bc4b9 | 1136 | unsigned misaligned; |
fce0657f | 1137 | unsigned quadrant; |
9b7a0325 | 1138 | int level; |
86a5ba02 | 1139 | int flooded = 0; |
ac1b714e | 1140 | int npte; |
9b7a0325 | 1141 | |
da4a00f0 | 1142 | pgprintk("%s: gpa %llx bytes %d\n", __FUNCTION__, gpa, bytes); |
86a5ba02 AK |
1143 | if (gfn == vcpu->last_pt_write_gfn) { |
1144 | ++vcpu->last_pt_write_count; | |
1145 | if (vcpu->last_pt_write_count >= 3) | |
1146 | flooded = 1; | |
1147 | } else { | |
1148 | vcpu->last_pt_write_gfn = gfn; | |
1149 | vcpu->last_pt_write_count = 1; | |
1150 | } | |
9b7a0325 AK |
1151 | index = kvm_page_table_hashfn(gfn) % KVM_NUM_MMU_PAGES; |
1152 | bucket = &vcpu->kvm->mmu_page_hash[index]; | |
0e7bc4b9 | 1153 | hlist_for_each_entry_safe(page, node, n, bucket, hash_link) { |
9b7a0325 AK |
1154 | if (page->gfn != gfn || page->role.metaphysical) |
1155 | continue; | |
0e7bc4b9 AK |
1156 | pte_size = page->role.glevels == PT32_ROOT_LEVEL ? 4 : 8; |
1157 | misaligned = (offset ^ (offset + bytes - 1)) & ~(pte_size - 1); | |
e925c5ba | 1158 | misaligned |= bytes < 4; |
86a5ba02 | 1159 | if (misaligned || flooded) { |
0e7bc4b9 AK |
1160 | /* |
1161 | * Misaligned accesses are too much trouble to fix | |
1162 | * up; also, they usually indicate a page is not used | |
1163 | * as a page table. | |
86a5ba02 AK |
1164 | * |
1165 | * If we're seeing too many writes to a page, | |
1166 | * it may no longer be a page table, or we may be | |
1167 | * forking, in which case it is better to unmap the | |
1168 | * page. | |
0e7bc4b9 AK |
1169 | */ |
1170 | pgprintk("misaligned: gpa %llx bytes %d role %x\n", | |
1171 | gpa, bytes, page->role.word); | |
90cb0529 | 1172 | kvm_mmu_zap_page(vcpu->kvm, page); |
0e7bc4b9 AK |
1173 | continue; |
1174 | } | |
9b7a0325 AK |
1175 | page_offset = offset; |
1176 | level = page->role.level; | |
ac1b714e | 1177 | npte = 1; |
9b7a0325 | 1178 | if (page->role.glevels == PT32_ROOT_LEVEL) { |
ac1b714e AK |
1179 | page_offset <<= 1; /* 32->64 */ |
1180 | /* | |
1181 | * A 32-bit pde maps 4MB while the shadow pdes map | |
1182 | * only 2MB. So we need to double the offset again | |
1183 | * and zap two pdes instead of one. | |
1184 | */ | |
1185 | if (level == PT32_ROOT_LEVEL) { | |
6b8d0f9b | 1186 | page_offset &= ~7; /* kill rounding error */ |
ac1b714e AK |
1187 | page_offset <<= 1; |
1188 | npte = 2; | |
1189 | } | |
fce0657f | 1190 | quadrant = page_offset >> PAGE_SHIFT; |
9b7a0325 | 1191 | page_offset &= ~PAGE_MASK; |
fce0657f AK |
1192 | if (quadrant != page->role.quadrant) |
1193 | continue; | |
9b7a0325 | 1194 | } |
47ad8e68 | 1195 | spte = &page->spt[page_offset / sizeof(*spte)]; |
ac1b714e | 1196 | while (npte--) { |
09072daf | 1197 | mmu_pte_write_zap_pte(vcpu, page, spte); |
0028425f | 1198 | mmu_pte_write_new_pte(vcpu, page, spte, new, bytes); |
ac1b714e | 1199 | ++spte; |
9b7a0325 | 1200 | } |
9b7a0325 | 1201 | } |
da4a00f0 AK |
1202 | } |
1203 | ||
a436036b AK |
1204 | int kvm_mmu_unprotect_page_virt(struct kvm_vcpu *vcpu, gva_t gva) |
1205 | { | |
1206 | gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, gva); | |
1207 | ||
1208 | return kvm_mmu_unprotect_page(vcpu, gpa >> PAGE_SHIFT); | |
1209 | } | |
1210 | ||
ebeace86 AK |
1211 | void kvm_mmu_free_some_pages(struct kvm_vcpu *vcpu) |
1212 | { | |
1213 | while (vcpu->kvm->n_free_mmu_pages < KVM_REFILL_PAGES) { | |
1214 | struct kvm_mmu_page *page; | |
1215 | ||
1216 | page = container_of(vcpu->kvm->active_mmu_pages.prev, | |
1217 | struct kvm_mmu_page, link); | |
90cb0529 | 1218 | kvm_mmu_zap_page(vcpu->kvm, page); |
ebeace86 AK |
1219 | } |
1220 | } | |
1221 | EXPORT_SYMBOL_GPL(kvm_mmu_free_some_pages); | |
1222 | ||
6aa8b732 AK |
1223 | static void free_mmu_pages(struct kvm_vcpu *vcpu) |
1224 | { | |
f51234c2 | 1225 | struct kvm_mmu_page *page; |
6aa8b732 | 1226 | |
f51234c2 AK |
1227 | while (!list_empty(&vcpu->kvm->active_mmu_pages)) { |
1228 | page = container_of(vcpu->kvm->active_mmu_pages.next, | |
1229 | struct kvm_mmu_page, link); | |
90cb0529 | 1230 | kvm_mmu_zap_page(vcpu->kvm, page); |
f51234c2 | 1231 | } |
17ac10ad | 1232 | free_page((unsigned long)vcpu->mmu.pae_root); |
6aa8b732 AK |
1233 | } |
1234 | ||
1235 | static int alloc_mmu_pages(struct kvm_vcpu *vcpu) | |
1236 | { | |
17ac10ad | 1237 | struct page *page; |
6aa8b732 AK |
1238 | int i; |
1239 | ||
1240 | ASSERT(vcpu); | |
1241 | ||
d3d25b04 | 1242 | vcpu->kvm->n_free_mmu_pages = KVM_NUM_MMU_PAGES; |
17ac10ad AK |
1243 | |
1244 | /* | |
1245 | * When emulating 32-bit mode, cr3 is only 32 bits even on x86_64. | |
1246 | * Therefore we need to allocate shadow page tables in the first | |
1247 | * 4GB of memory, which happens to fit the DMA32 zone. | |
1248 | */ | |
1249 | page = alloc_page(GFP_KERNEL | __GFP_DMA32); | |
1250 | if (!page) | |
1251 | goto error_1; | |
1252 | vcpu->mmu.pae_root = page_address(page); | |
1253 | for (i = 0; i < 4; ++i) | |
1254 | vcpu->mmu.pae_root[i] = INVALID_PAGE; | |
1255 | ||
6aa8b732 AK |
1256 | return 0; |
1257 | ||
1258 | error_1: | |
1259 | free_mmu_pages(vcpu); | |
1260 | return -ENOMEM; | |
1261 | } | |
1262 | ||
8018c27b | 1263 | int kvm_mmu_create(struct kvm_vcpu *vcpu) |
6aa8b732 | 1264 | { |
6aa8b732 AK |
1265 | ASSERT(vcpu); |
1266 | ASSERT(!VALID_PAGE(vcpu->mmu.root_hpa)); | |
6aa8b732 | 1267 | |
8018c27b IM |
1268 | return alloc_mmu_pages(vcpu); |
1269 | } | |
6aa8b732 | 1270 | |
8018c27b IM |
1271 | int kvm_mmu_setup(struct kvm_vcpu *vcpu) |
1272 | { | |
1273 | ASSERT(vcpu); | |
1274 | ASSERT(!VALID_PAGE(vcpu->mmu.root_hpa)); | |
2c264957 | 1275 | |
8018c27b | 1276 | return init_kvm_mmu(vcpu); |
6aa8b732 AK |
1277 | } |
1278 | ||
1279 | void kvm_mmu_destroy(struct kvm_vcpu *vcpu) | |
1280 | { | |
1281 | ASSERT(vcpu); | |
1282 | ||
1283 | destroy_kvm_mmu(vcpu); | |
1284 | free_mmu_pages(vcpu); | |
714b93da | 1285 | mmu_free_memory_caches(vcpu); |
6aa8b732 AK |
1286 | } |
1287 | ||
90cb0529 | 1288 | void kvm_mmu_slot_remove_write_access(struct kvm *kvm, int slot) |
6aa8b732 AK |
1289 | { |
1290 | struct kvm_mmu_page *page; | |
1291 | ||
1292 | list_for_each_entry(page, &kvm->active_mmu_pages, link) { | |
1293 | int i; | |
1294 | u64 *pt; | |
1295 | ||
1296 | if (!test_bit(slot, &page->slot_bitmap)) | |
1297 | continue; | |
1298 | ||
47ad8e68 | 1299 | pt = page->spt; |
6aa8b732 AK |
1300 | for (i = 0; i < PT64_ENT_PER_PAGE; ++i) |
1301 | /* avoid RMW */ | |
cd4a4e53 | 1302 | if (pt[i] & PT_WRITABLE_MASK) { |
90cb0529 | 1303 | rmap_remove(&pt[i]); |
6aa8b732 | 1304 | pt[i] &= ~PT_WRITABLE_MASK; |
cd4a4e53 | 1305 | } |
6aa8b732 AK |
1306 | } |
1307 | } | |
37a7d8b0 | 1308 | |
90cb0529 | 1309 | void kvm_mmu_zap_all(struct kvm *kvm) |
e0fa826f | 1310 | { |
90cb0529 | 1311 | struct kvm_mmu_page *page, *node; |
e0fa826f | 1312 | |
90cb0529 AK |
1313 | list_for_each_entry_safe(page, node, &kvm->active_mmu_pages, link) |
1314 | kvm_mmu_zap_page(kvm, page); | |
e0fa826f | 1315 | |
90cb0529 | 1316 | kvm_flush_remote_tlbs(kvm); |
e0fa826f DL |
1317 | } |
1318 | ||
b5a33a75 AK |
1319 | void kvm_mmu_module_exit(void) |
1320 | { | |
1321 | if (pte_chain_cache) | |
1322 | kmem_cache_destroy(pte_chain_cache); | |
1323 | if (rmap_desc_cache) | |
1324 | kmem_cache_destroy(rmap_desc_cache); | |
d3d25b04 AK |
1325 | if (mmu_page_header_cache) |
1326 | kmem_cache_destroy(mmu_page_header_cache); | |
b5a33a75 AK |
1327 | } |
1328 | ||
1329 | int kvm_mmu_module_init(void) | |
1330 | { | |
1331 | pte_chain_cache = kmem_cache_create("kvm_pte_chain", | |
1332 | sizeof(struct kvm_pte_chain), | |
20c2df83 | 1333 | 0, 0, NULL); |
b5a33a75 AK |
1334 | if (!pte_chain_cache) |
1335 | goto nomem; | |
1336 | rmap_desc_cache = kmem_cache_create("kvm_rmap_desc", | |
1337 | sizeof(struct kvm_rmap_desc), | |
20c2df83 | 1338 | 0, 0, NULL); |
b5a33a75 AK |
1339 | if (!rmap_desc_cache) |
1340 | goto nomem; | |
1341 | ||
d3d25b04 AK |
1342 | mmu_page_header_cache = kmem_cache_create("kvm_mmu_page_header", |
1343 | sizeof(struct kvm_mmu_page), | |
20c2df83 | 1344 | 0, 0, NULL); |
d3d25b04 AK |
1345 | if (!mmu_page_header_cache) |
1346 | goto nomem; | |
1347 | ||
b5a33a75 AK |
1348 | return 0; |
1349 | ||
1350 | nomem: | |
1351 | kvm_mmu_module_exit(); | |
1352 | return -ENOMEM; | |
1353 | } | |
1354 | ||
37a7d8b0 AK |
1355 | #ifdef AUDIT |
1356 | ||
1357 | static const char *audit_msg; | |
1358 | ||
1359 | static gva_t canonicalize(gva_t gva) | |
1360 | { | |
1361 | #ifdef CONFIG_X86_64 | |
1362 | gva = (long long)(gva << 16) >> 16; | |
1363 | #endif | |
1364 | return gva; | |
1365 | } | |
1366 | ||
1367 | static void audit_mappings_page(struct kvm_vcpu *vcpu, u64 page_pte, | |
1368 | gva_t va, int level) | |
1369 | { | |
1370 | u64 *pt = __va(page_pte & PT64_BASE_ADDR_MASK); | |
1371 | int i; | |
1372 | gva_t va_delta = 1ul << (PAGE_SHIFT + 9 * (level - 1)); | |
1373 | ||
1374 | for (i = 0; i < PT64_ENT_PER_PAGE; ++i, va += va_delta) { | |
1375 | u64 ent = pt[i]; | |
1376 | ||
2807696c | 1377 | if (!(ent & PT_PRESENT_MASK)) |
37a7d8b0 AK |
1378 | continue; |
1379 | ||
1380 | va = canonicalize(va); | |
1381 | if (level > 1) | |
1382 | audit_mappings_page(vcpu, ent, va, level - 1); | |
1383 | else { | |
1384 | gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, va); | |
1385 | hpa_t hpa = gpa_to_hpa(vcpu, gpa); | |
1386 | ||
1387 | if ((ent & PT_PRESENT_MASK) | |
1388 | && (ent & PT64_BASE_ADDR_MASK) != hpa) | |
1389 | printk(KERN_ERR "audit error: (%s) levels %d" | |
1390 | " gva %lx gpa %llx hpa %llx ent %llx\n", | |
1391 | audit_msg, vcpu->mmu.root_level, | |
1392 | va, gpa, hpa, ent); | |
1393 | } | |
1394 | } | |
1395 | } | |
1396 | ||
1397 | static void audit_mappings(struct kvm_vcpu *vcpu) | |
1398 | { | |
1ea252af | 1399 | unsigned i; |
37a7d8b0 AK |
1400 | |
1401 | if (vcpu->mmu.root_level == 4) | |
1402 | audit_mappings_page(vcpu, vcpu->mmu.root_hpa, 0, 4); | |
1403 | else | |
1404 | for (i = 0; i < 4; ++i) | |
1405 | if (vcpu->mmu.pae_root[i] & PT_PRESENT_MASK) | |
1406 | audit_mappings_page(vcpu, | |
1407 | vcpu->mmu.pae_root[i], | |
1408 | i << 30, | |
1409 | 2); | |
1410 | } | |
1411 | ||
1412 | static int count_rmaps(struct kvm_vcpu *vcpu) | |
1413 | { | |
1414 | int nmaps = 0; | |
1415 | int i, j, k; | |
1416 | ||
1417 | for (i = 0; i < KVM_MEMORY_SLOTS; ++i) { | |
1418 | struct kvm_memory_slot *m = &vcpu->kvm->memslots[i]; | |
1419 | struct kvm_rmap_desc *d; | |
1420 | ||
1421 | for (j = 0; j < m->npages; ++j) { | |
1422 | struct page *page = m->phys_mem[j]; | |
1423 | ||
1424 | if (!page->private) | |
1425 | continue; | |
1426 | if (!(page->private & 1)) { | |
1427 | ++nmaps; | |
1428 | continue; | |
1429 | } | |
1430 | d = (struct kvm_rmap_desc *)(page->private & ~1ul); | |
1431 | while (d) { | |
1432 | for (k = 0; k < RMAP_EXT; ++k) | |
1433 | if (d->shadow_ptes[k]) | |
1434 | ++nmaps; | |
1435 | else | |
1436 | break; | |
1437 | d = d->more; | |
1438 | } | |
1439 | } | |
1440 | } | |
1441 | return nmaps; | |
1442 | } | |
1443 | ||
1444 | static int count_writable_mappings(struct kvm_vcpu *vcpu) | |
1445 | { | |
1446 | int nmaps = 0; | |
1447 | struct kvm_mmu_page *page; | |
1448 | int i; | |
1449 | ||
1450 | list_for_each_entry(page, &vcpu->kvm->active_mmu_pages, link) { | |
47ad8e68 | 1451 | u64 *pt = page->spt; |
37a7d8b0 AK |
1452 | |
1453 | if (page->role.level != PT_PAGE_TABLE_LEVEL) | |
1454 | continue; | |
1455 | ||
1456 | for (i = 0; i < PT64_ENT_PER_PAGE; ++i) { | |
1457 | u64 ent = pt[i]; | |
1458 | ||
1459 | if (!(ent & PT_PRESENT_MASK)) | |
1460 | continue; | |
1461 | if (!(ent & PT_WRITABLE_MASK)) | |
1462 | continue; | |
1463 | ++nmaps; | |
1464 | } | |
1465 | } | |
1466 | return nmaps; | |
1467 | } | |
1468 | ||
1469 | static void audit_rmap(struct kvm_vcpu *vcpu) | |
1470 | { | |
1471 | int n_rmap = count_rmaps(vcpu); | |
1472 | int n_actual = count_writable_mappings(vcpu); | |
1473 | ||
1474 | if (n_rmap != n_actual) | |
1475 | printk(KERN_ERR "%s: (%s) rmap %d actual %d\n", | |
1476 | __FUNCTION__, audit_msg, n_rmap, n_actual); | |
1477 | } | |
1478 | ||
1479 | static void audit_write_protection(struct kvm_vcpu *vcpu) | |
1480 | { | |
1481 | struct kvm_mmu_page *page; | |
1482 | ||
1483 | list_for_each_entry(page, &vcpu->kvm->active_mmu_pages, link) { | |
1484 | hfn_t hfn; | |
1485 | struct page *pg; | |
1486 | ||
1487 | if (page->role.metaphysical) | |
1488 | continue; | |
1489 | ||
1490 | hfn = gpa_to_hpa(vcpu, (gpa_t)page->gfn << PAGE_SHIFT) | |
1491 | >> PAGE_SHIFT; | |
1492 | pg = pfn_to_page(hfn); | |
1493 | if (pg->private) | |
1494 | printk(KERN_ERR "%s: (%s) shadow page has writable" | |
1495 | " mappings: gfn %lx role %x\n", | |
1496 | __FUNCTION__, audit_msg, page->gfn, | |
1497 | page->role.word); | |
1498 | } | |
1499 | } | |
1500 | ||
1501 | static void kvm_mmu_audit(struct kvm_vcpu *vcpu, const char *msg) | |
1502 | { | |
1503 | int olddbg = dbg; | |
1504 | ||
1505 | dbg = 0; | |
1506 | audit_msg = msg; | |
1507 | audit_rmap(vcpu); | |
1508 | audit_write_protection(vcpu); | |
1509 | audit_mappings(vcpu); | |
1510 | dbg = olddbg; | |
1511 | } | |
1512 | ||
1513 | #endif |