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 AK |
157 | static struct kmem_cache *mmu_page_cache; |
158 | static struct kmem_cache *mmu_page_header_cache; | |
b5a33a75 | 159 | |
6aa8b732 AK |
160 | static int is_write_protection(struct kvm_vcpu *vcpu) |
161 | { | |
162 | return vcpu->cr0 & CR0_WP_MASK; | |
163 | } | |
164 | ||
165 | static int is_cpuid_PSE36(void) | |
166 | { | |
167 | return 1; | |
168 | } | |
169 | ||
73b1087e AK |
170 | static int is_nx(struct kvm_vcpu *vcpu) |
171 | { | |
172 | return vcpu->shadow_efer & EFER_NX; | |
173 | } | |
174 | ||
6aa8b732 AK |
175 | static int is_present_pte(unsigned long pte) |
176 | { | |
177 | return pte & PT_PRESENT_MASK; | |
178 | } | |
179 | ||
180 | static int is_writeble_pte(unsigned long pte) | |
181 | { | |
182 | return pte & PT_WRITABLE_MASK; | |
183 | } | |
184 | ||
185 | static int is_io_pte(unsigned long pte) | |
186 | { | |
187 | return pte & PT_SHADOW_IO_MARK; | |
188 | } | |
189 | ||
cd4a4e53 AK |
190 | static int is_rmap_pte(u64 pte) |
191 | { | |
192 | return (pte & (PT_WRITABLE_MASK | PT_PRESENT_MASK)) | |
193 | == (PT_WRITABLE_MASK | PT_PRESENT_MASK); | |
194 | } | |
195 | ||
e663ee64 AK |
196 | static void set_shadow_pte(u64 *sptep, u64 spte) |
197 | { | |
198 | #ifdef CONFIG_X86_64 | |
199 | set_64bit((unsigned long *)sptep, spte); | |
200 | #else | |
201 | set_64bit((unsigned long long *)sptep, spte); | |
202 | #endif | |
203 | } | |
204 | ||
e2dec939 | 205 | static int mmu_topup_memory_cache(struct kvm_mmu_memory_cache *cache, |
8c438502 AK |
206 | struct kmem_cache *base_cache, int min, |
207 | gfp_t gfp_flags) | |
714b93da AK |
208 | { |
209 | void *obj; | |
210 | ||
211 | if (cache->nobjs >= min) | |
e2dec939 | 212 | return 0; |
714b93da | 213 | while (cache->nobjs < ARRAY_SIZE(cache->objects)) { |
8c438502 | 214 | obj = kmem_cache_zalloc(base_cache, gfp_flags); |
714b93da | 215 | if (!obj) |
e2dec939 | 216 | return -ENOMEM; |
714b93da AK |
217 | cache->objects[cache->nobjs++] = obj; |
218 | } | |
e2dec939 | 219 | return 0; |
714b93da AK |
220 | } |
221 | ||
222 | static void mmu_free_memory_cache(struct kvm_mmu_memory_cache *mc) | |
223 | { | |
224 | while (mc->nobjs) | |
225 | kfree(mc->objects[--mc->nobjs]); | |
226 | } | |
227 | ||
8c438502 | 228 | static int __mmu_topup_memory_caches(struct kvm_vcpu *vcpu, gfp_t gfp_flags) |
714b93da | 229 | { |
e2dec939 AK |
230 | int r; |
231 | ||
232 | r = mmu_topup_memory_cache(&vcpu->mmu_pte_chain_cache, | |
8c438502 | 233 | pte_chain_cache, 4, gfp_flags); |
e2dec939 AK |
234 | if (r) |
235 | goto out; | |
236 | r = mmu_topup_memory_cache(&vcpu->mmu_rmap_desc_cache, | |
8c438502 | 237 | rmap_desc_cache, 1, gfp_flags); |
d3d25b04 AK |
238 | if (r) |
239 | goto out; | |
240 | r = mmu_topup_memory_cache(&vcpu->mmu_page_cache, | |
241 | mmu_page_cache, 4, gfp_flags); | |
242 | if (r) | |
243 | goto out; | |
244 | r = mmu_topup_memory_cache(&vcpu->mmu_page_header_cache, | |
245 | mmu_page_header_cache, 4, gfp_flags); | |
e2dec939 AK |
246 | out: |
247 | return r; | |
714b93da AK |
248 | } |
249 | ||
8c438502 AK |
250 | static int mmu_topup_memory_caches(struct kvm_vcpu *vcpu) |
251 | { | |
252 | int r; | |
253 | ||
254 | r = __mmu_topup_memory_caches(vcpu, GFP_NOWAIT); | |
255 | if (r < 0) { | |
256 | spin_unlock(&vcpu->kvm->lock); | |
257 | kvm_arch_ops->vcpu_put(vcpu); | |
258 | r = __mmu_topup_memory_caches(vcpu, GFP_KERNEL); | |
259 | kvm_arch_ops->vcpu_load(vcpu); | |
260 | spin_lock(&vcpu->kvm->lock); | |
261 | } | |
262 | return r; | |
263 | } | |
264 | ||
714b93da AK |
265 | static void mmu_free_memory_caches(struct kvm_vcpu *vcpu) |
266 | { | |
267 | mmu_free_memory_cache(&vcpu->mmu_pte_chain_cache); | |
268 | mmu_free_memory_cache(&vcpu->mmu_rmap_desc_cache); | |
d3d25b04 AK |
269 | mmu_free_memory_cache(&vcpu->mmu_page_cache); |
270 | mmu_free_memory_cache(&vcpu->mmu_page_header_cache); | |
714b93da AK |
271 | } |
272 | ||
273 | static void *mmu_memory_cache_alloc(struct kvm_mmu_memory_cache *mc, | |
274 | size_t size) | |
275 | { | |
276 | void *p; | |
277 | ||
278 | BUG_ON(!mc->nobjs); | |
279 | p = mc->objects[--mc->nobjs]; | |
280 | memset(p, 0, size); | |
281 | return p; | |
282 | } | |
283 | ||
284 | static void mmu_memory_cache_free(struct kvm_mmu_memory_cache *mc, void *obj) | |
285 | { | |
286 | if (mc->nobjs < KVM_NR_MEM_OBJS) | |
287 | mc->objects[mc->nobjs++] = obj; | |
288 | else | |
289 | kfree(obj); | |
290 | } | |
291 | ||
292 | static struct kvm_pte_chain *mmu_alloc_pte_chain(struct kvm_vcpu *vcpu) | |
293 | { | |
294 | return mmu_memory_cache_alloc(&vcpu->mmu_pte_chain_cache, | |
295 | sizeof(struct kvm_pte_chain)); | |
296 | } | |
297 | ||
298 | static void mmu_free_pte_chain(struct kvm_vcpu *vcpu, | |
299 | struct kvm_pte_chain *pc) | |
300 | { | |
301 | mmu_memory_cache_free(&vcpu->mmu_pte_chain_cache, pc); | |
302 | } | |
303 | ||
304 | static struct kvm_rmap_desc *mmu_alloc_rmap_desc(struct kvm_vcpu *vcpu) | |
305 | { | |
306 | return mmu_memory_cache_alloc(&vcpu->mmu_rmap_desc_cache, | |
307 | sizeof(struct kvm_rmap_desc)); | |
308 | } | |
309 | ||
310 | static void mmu_free_rmap_desc(struct kvm_vcpu *vcpu, | |
311 | struct kvm_rmap_desc *rd) | |
312 | { | |
313 | mmu_memory_cache_free(&vcpu->mmu_rmap_desc_cache, rd); | |
314 | } | |
315 | ||
cd4a4e53 AK |
316 | /* |
317 | * Reverse mapping data structures: | |
318 | * | |
319 | * If page->private bit zero is zero, then page->private points to the | |
320 | * shadow page table entry that points to page_address(page). | |
321 | * | |
322 | * If page->private bit zero is one, (then page->private & ~1) points | |
323 | * to a struct kvm_rmap_desc containing more mappings. | |
324 | */ | |
714b93da | 325 | static void rmap_add(struct kvm_vcpu *vcpu, u64 *spte) |
cd4a4e53 AK |
326 | { |
327 | struct page *page; | |
328 | struct kvm_rmap_desc *desc; | |
329 | int i; | |
330 | ||
331 | if (!is_rmap_pte(*spte)) | |
332 | return; | |
333 | page = pfn_to_page((*spte & PT64_BASE_ADDR_MASK) >> PAGE_SHIFT); | |
5972e953 | 334 | if (!page_private(page)) { |
cd4a4e53 | 335 | rmap_printk("rmap_add: %p %llx 0->1\n", spte, *spte); |
5972e953 MR |
336 | set_page_private(page,(unsigned long)spte); |
337 | } else if (!(page_private(page) & 1)) { | |
cd4a4e53 | 338 | rmap_printk("rmap_add: %p %llx 1->many\n", spte, *spte); |
714b93da | 339 | desc = mmu_alloc_rmap_desc(vcpu); |
5972e953 | 340 | desc->shadow_ptes[0] = (u64 *)page_private(page); |
cd4a4e53 | 341 | desc->shadow_ptes[1] = spte; |
5972e953 | 342 | set_page_private(page,(unsigned long)desc | 1); |
cd4a4e53 AK |
343 | } else { |
344 | rmap_printk("rmap_add: %p %llx many->many\n", spte, *spte); | |
5972e953 | 345 | desc = (struct kvm_rmap_desc *)(page_private(page) & ~1ul); |
cd4a4e53 AK |
346 | while (desc->shadow_ptes[RMAP_EXT-1] && desc->more) |
347 | desc = desc->more; | |
348 | if (desc->shadow_ptes[RMAP_EXT-1]) { | |
714b93da | 349 | desc->more = mmu_alloc_rmap_desc(vcpu); |
cd4a4e53 AK |
350 | desc = desc->more; |
351 | } | |
352 | for (i = 0; desc->shadow_ptes[i]; ++i) | |
353 | ; | |
354 | desc->shadow_ptes[i] = spte; | |
355 | } | |
356 | } | |
357 | ||
714b93da AK |
358 | static void rmap_desc_remove_entry(struct kvm_vcpu *vcpu, |
359 | struct page *page, | |
cd4a4e53 AK |
360 | struct kvm_rmap_desc *desc, |
361 | int i, | |
362 | struct kvm_rmap_desc *prev_desc) | |
363 | { | |
364 | int j; | |
365 | ||
366 | for (j = RMAP_EXT - 1; !desc->shadow_ptes[j] && j > i; --j) | |
367 | ; | |
368 | desc->shadow_ptes[i] = desc->shadow_ptes[j]; | |
11718b4d | 369 | desc->shadow_ptes[j] = NULL; |
cd4a4e53 AK |
370 | if (j != 0) |
371 | return; | |
372 | if (!prev_desc && !desc->more) | |
5972e953 | 373 | set_page_private(page,(unsigned long)desc->shadow_ptes[0]); |
cd4a4e53 AK |
374 | else |
375 | if (prev_desc) | |
376 | prev_desc->more = desc->more; | |
377 | else | |
5972e953 | 378 | set_page_private(page,(unsigned long)desc->more | 1); |
714b93da | 379 | mmu_free_rmap_desc(vcpu, desc); |
cd4a4e53 AK |
380 | } |
381 | ||
714b93da | 382 | static void rmap_remove(struct kvm_vcpu *vcpu, u64 *spte) |
cd4a4e53 AK |
383 | { |
384 | struct page *page; | |
385 | struct kvm_rmap_desc *desc; | |
386 | struct kvm_rmap_desc *prev_desc; | |
387 | int i; | |
388 | ||
389 | if (!is_rmap_pte(*spte)) | |
390 | return; | |
391 | page = pfn_to_page((*spte & PT64_BASE_ADDR_MASK) >> PAGE_SHIFT); | |
5972e953 | 392 | if (!page_private(page)) { |
cd4a4e53 AK |
393 | printk(KERN_ERR "rmap_remove: %p %llx 0->BUG\n", spte, *spte); |
394 | BUG(); | |
5972e953 | 395 | } else if (!(page_private(page) & 1)) { |
cd4a4e53 | 396 | rmap_printk("rmap_remove: %p %llx 1->0\n", spte, *spte); |
5972e953 | 397 | if ((u64 *)page_private(page) != spte) { |
cd4a4e53 AK |
398 | printk(KERN_ERR "rmap_remove: %p %llx 1->BUG\n", |
399 | spte, *spte); | |
400 | BUG(); | |
401 | } | |
5972e953 | 402 | set_page_private(page,0); |
cd4a4e53 AK |
403 | } else { |
404 | rmap_printk("rmap_remove: %p %llx many->many\n", spte, *spte); | |
5972e953 | 405 | desc = (struct kvm_rmap_desc *)(page_private(page) & ~1ul); |
cd4a4e53 AK |
406 | prev_desc = NULL; |
407 | while (desc) { | |
408 | for (i = 0; i < RMAP_EXT && desc->shadow_ptes[i]; ++i) | |
409 | if (desc->shadow_ptes[i] == spte) { | |
714b93da AK |
410 | rmap_desc_remove_entry(vcpu, page, |
411 | desc, i, | |
cd4a4e53 AK |
412 | prev_desc); |
413 | return; | |
414 | } | |
415 | prev_desc = desc; | |
416 | desc = desc->more; | |
417 | } | |
418 | BUG(); | |
419 | } | |
420 | } | |
421 | ||
714b93da | 422 | static void rmap_write_protect(struct kvm_vcpu *vcpu, u64 gfn) |
374cbac0 | 423 | { |
714b93da | 424 | struct kvm *kvm = vcpu->kvm; |
374cbac0 | 425 | struct page *page; |
374cbac0 AK |
426 | struct kvm_rmap_desc *desc; |
427 | u64 *spte; | |
428 | ||
954bbbc2 AK |
429 | page = gfn_to_page(kvm, gfn); |
430 | BUG_ON(!page); | |
374cbac0 | 431 | |
5972e953 MR |
432 | while (page_private(page)) { |
433 | if (!(page_private(page) & 1)) | |
434 | spte = (u64 *)page_private(page); | |
374cbac0 | 435 | else { |
5972e953 | 436 | desc = (struct kvm_rmap_desc *)(page_private(page) & ~1ul); |
374cbac0 AK |
437 | spte = desc->shadow_ptes[0]; |
438 | } | |
439 | BUG_ON(!spte); | |
27aba766 AK |
440 | BUG_ON((*spte & PT64_BASE_ADDR_MASK) >> PAGE_SHIFT |
441 | != page_to_pfn(page)); | |
374cbac0 AK |
442 | BUG_ON(!(*spte & PT_PRESENT_MASK)); |
443 | BUG_ON(!(*spte & PT_WRITABLE_MASK)); | |
444 | rmap_printk("rmap_write_protect: spte %p %llx\n", spte, *spte); | |
714b93da | 445 | rmap_remove(vcpu, spte); |
e663ee64 | 446 | set_shadow_pte(spte, *spte & ~PT_WRITABLE_MASK); |
88a97f0b | 447 | kvm_flush_remote_tlbs(vcpu->kvm); |
374cbac0 AK |
448 | } |
449 | } | |
450 | ||
d6c69ee9 | 451 | #ifdef MMU_DEBUG |
47ad8e68 | 452 | static int is_empty_shadow_page(u64 *spt) |
6aa8b732 | 453 | { |
139bdb2d AK |
454 | u64 *pos; |
455 | u64 *end; | |
456 | ||
47ad8e68 | 457 | for (pos = spt, end = pos + PAGE_SIZE / sizeof(u64); pos != end; pos++) |
139bdb2d AK |
458 | if (*pos != 0) { |
459 | printk(KERN_ERR "%s: %p %llx\n", __FUNCTION__, | |
460 | pos, *pos); | |
6aa8b732 | 461 | return 0; |
139bdb2d | 462 | } |
6aa8b732 AK |
463 | return 1; |
464 | } | |
d6c69ee9 | 465 | #endif |
6aa8b732 | 466 | |
4b02d6da AK |
467 | static void kvm_mmu_free_page(struct kvm_vcpu *vcpu, |
468 | struct kvm_mmu_page *page_head) | |
260746c0 | 469 | { |
47ad8e68 | 470 | ASSERT(is_empty_shadow_page(page_head->spt)); |
d3d25b04 AK |
471 | list_del(&page_head->link); |
472 | mmu_memory_cache_free(&vcpu->mmu_page_cache, page_head->spt); | |
473 | mmu_memory_cache_free(&vcpu->mmu_page_header_cache, page_head); | |
260746c0 AK |
474 | ++vcpu->kvm->n_free_mmu_pages; |
475 | } | |
476 | ||
cea0f0e7 AK |
477 | static unsigned kvm_page_table_hashfn(gfn_t gfn) |
478 | { | |
479 | return gfn; | |
480 | } | |
481 | ||
25c0de2c AK |
482 | static struct kvm_mmu_page *kvm_mmu_alloc_page(struct kvm_vcpu *vcpu, |
483 | u64 *parent_pte) | |
6aa8b732 AK |
484 | { |
485 | struct kvm_mmu_page *page; | |
486 | ||
d3d25b04 | 487 | if (!vcpu->kvm->n_free_mmu_pages) |
25c0de2c | 488 | return NULL; |
6aa8b732 | 489 | |
d3d25b04 AK |
490 | page = mmu_memory_cache_alloc(&vcpu->mmu_page_header_cache, |
491 | sizeof *page); | |
492 | page->spt = mmu_memory_cache_alloc(&vcpu->mmu_page_cache, PAGE_SIZE); | |
493 | set_page_private(virt_to_page(page->spt), (unsigned long)page); | |
494 | list_add(&page->link, &vcpu->kvm->active_mmu_pages); | |
47ad8e68 | 495 | ASSERT(is_empty_shadow_page(page->spt)); |
6aa8b732 | 496 | page->slot_bitmap = 0; |
cea0f0e7 | 497 | page->multimapped = 0; |
6aa8b732 | 498 | page->parent_pte = parent_pte; |
ebeace86 | 499 | --vcpu->kvm->n_free_mmu_pages; |
25c0de2c | 500 | return page; |
6aa8b732 AK |
501 | } |
502 | ||
714b93da AK |
503 | static void mmu_page_add_parent_pte(struct kvm_vcpu *vcpu, |
504 | struct kvm_mmu_page *page, u64 *parent_pte) | |
cea0f0e7 AK |
505 | { |
506 | struct kvm_pte_chain *pte_chain; | |
507 | struct hlist_node *node; | |
508 | int i; | |
509 | ||
510 | if (!parent_pte) | |
511 | return; | |
512 | if (!page->multimapped) { | |
513 | u64 *old = page->parent_pte; | |
514 | ||
515 | if (!old) { | |
516 | page->parent_pte = parent_pte; | |
517 | return; | |
518 | } | |
519 | page->multimapped = 1; | |
714b93da | 520 | pte_chain = mmu_alloc_pte_chain(vcpu); |
cea0f0e7 AK |
521 | INIT_HLIST_HEAD(&page->parent_ptes); |
522 | hlist_add_head(&pte_chain->link, &page->parent_ptes); | |
523 | pte_chain->parent_ptes[0] = old; | |
524 | } | |
525 | hlist_for_each_entry(pte_chain, node, &page->parent_ptes, link) { | |
526 | if (pte_chain->parent_ptes[NR_PTE_CHAIN_ENTRIES-1]) | |
527 | continue; | |
528 | for (i = 0; i < NR_PTE_CHAIN_ENTRIES; ++i) | |
529 | if (!pte_chain->parent_ptes[i]) { | |
530 | pte_chain->parent_ptes[i] = parent_pte; | |
531 | return; | |
532 | } | |
533 | } | |
714b93da | 534 | pte_chain = mmu_alloc_pte_chain(vcpu); |
cea0f0e7 AK |
535 | BUG_ON(!pte_chain); |
536 | hlist_add_head(&pte_chain->link, &page->parent_ptes); | |
537 | pte_chain->parent_ptes[0] = parent_pte; | |
538 | } | |
539 | ||
714b93da AK |
540 | static void mmu_page_remove_parent_pte(struct kvm_vcpu *vcpu, |
541 | struct kvm_mmu_page *page, | |
cea0f0e7 AK |
542 | u64 *parent_pte) |
543 | { | |
544 | struct kvm_pte_chain *pte_chain; | |
545 | struct hlist_node *node; | |
546 | int i; | |
547 | ||
548 | if (!page->multimapped) { | |
549 | BUG_ON(page->parent_pte != parent_pte); | |
550 | page->parent_pte = NULL; | |
551 | return; | |
552 | } | |
553 | hlist_for_each_entry(pte_chain, node, &page->parent_ptes, link) | |
554 | for (i = 0; i < NR_PTE_CHAIN_ENTRIES; ++i) { | |
555 | if (!pte_chain->parent_ptes[i]) | |
556 | break; | |
557 | if (pte_chain->parent_ptes[i] != parent_pte) | |
558 | continue; | |
697fe2e2 AK |
559 | while (i + 1 < NR_PTE_CHAIN_ENTRIES |
560 | && pte_chain->parent_ptes[i + 1]) { | |
cea0f0e7 AK |
561 | pte_chain->parent_ptes[i] |
562 | = pte_chain->parent_ptes[i + 1]; | |
563 | ++i; | |
564 | } | |
565 | pte_chain->parent_ptes[i] = NULL; | |
697fe2e2 AK |
566 | if (i == 0) { |
567 | hlist_del(&pte_chain->link); | |
714b93da | 568 | mmu_free_pte_chain(vcpu, pte_chain); |
697fe2e2 AK |
569 | if (hlist_empty(&page->parent_ptes)) { |
570 | page->multimapped = 0; | |
571 | page->parent_pte = NULL; | |
572 | } | |
573 | } | |
cea0f0e7 AK |
574 | return; |
575 | } | |
576 | BUG(); | |
577 | } | |
578 | ||
579 | static struct kvm_mmu_page *kvm_mmu_lookup_page(struct kvm_vcpu *vcpu, | |
580 | gfn_t gfn) | |
581 | { | |
582 | unsigned index; | |
583 | struct hlist_head *bucket; | |
584 | struct kvm_mmu_page *page; | |
585 | struct hlist_node *node; | |
586 | ||
587 | pgprintk("%s: looking for gfn %lx\n", __FUNCTION__, gfn); | |
588 | index = kvm_page_table_hashfn(gfn) % KVM_NUM_MMU_PAGES; | |
589 | bucket = &vcpu->kvm->mmu_page_hash[index]; | |
590 | hlist_for_each_entry(page, node, bucket, hash_link) | |
591 | if (page->gfn == gfn && !page->role.metaphysical) { | |
592 | pgprintk("%s: found role %x\n", | |
593 | __FUNCTION__, page->role.word); | |
594 | return page; | |
595 | } | |
596 | return NULL; | |
597 | } | |
598 | ||
599 | static struct kvm_mmu_page *kvm_mmu_get_page(struct kvm_vcpu *vcpu, | |
600 | gfn_t gfn, | |
601 | gva_t gaddr, | |
602 | unsigned level, | |
603 | int metaphysical, | |
d28c6cfb | 604 | unsigned hugepage_access, |
cea0f0e7 AK |
605 | u64 *parent_pte) |
606 | { | |
607 | union kvm_mmu_page_role role; | |
608 | unsigned index; | |
609 | unsigned quadrant; | |
610 | struct hlist_head *bucket; | |
611 | struct kvm_mmu_page *page; | |
612 | struct hlist_node *node; | |
613 | ||
614 | role.word = 0; | |
615 | role.glevels = vcpu->mmu.root_level; | |
616 | role.level = level; | |
617 | role.metaphysical = metaphysical; | |
d28c6cfb | 618 | role.hugepage_access = hugepage_access; |
cea0f0e7 AK |
619 | if (vcpu->mmu.root_level <= PT32_ROOT_LEVEL) { |
620 | quadrant = gaddr >> (PAGE_SHIFT + (PT64_PT_BITS * level)); | |
621 | quadrant &= (1 << ((PT32_PT_BITS - PT64_PT_BITS) * level)) - 1; | |
622 | role.quadrant = quadrant; | |
623 | } | |
624 | pgprintk("%s: looking gfn %lx role %x\n", __FUNCTION__, | |
625 | gfn, role.word); | |
626 | index = kvm_page_table_hashfn(gfn) % KVM_NUM_MMU_PAGES; | |
627 | bucket = &vcpu->kvm->mmu_page_hash[index]; | |
628 | hlist_for_each_entry(page, node, bucket, hash_link) | |
629 | if (page->gfn == gfn && page->role.word == role.word) { | |
714b93da | 630 | mmu_page_add_parent_pte(vcpu, page, parent_pte); |
cea0f0e7 AK |
631 | pgprintk("%s: found\n", __FUNCTION__); |
632 | return page; | |
633 | } | |
634 | page = kvm_mmu_alloc_page(vcpu, parent_pte); | |
635 | if (!page) | |
636 | return page; | |
637 | pgprintk("%s: adding gfn %lx role %x\n", __FUNCTION__, gfn, role.word); | |
638 | page->gfn = gfn; | |
639 | page->role = role; | |
640 | hlist_add_head(&page->hash_link, bucket); | |
374cbac0 | 641 | if (!metaphysical) |
714b93da | 642 | rmap_write_protect(vcpu, gfn); |
cea0f0e7 AK |
643 | return page; |
644 | } | |
645 | ||
a436036b AK |
646 | static void kvm_mmu_page_unlink_children(struct kvm_vcpu *vcpu, |
647 | struct kvm_mmu_page *page) | |
648 | { | |
697fe2e2 AK |
649 | unsigned i; |
650 | u64 *pt; | |
651 | u64 ent; | |
652 | ||
47ad8e68 | 653 | pt = page->spt; |
697fe2e2 AK |
654 | |
655 | if (page->role.level == PT_PAGE_TABLE_LEVEL) { | |
656 | for (i = 0; i < PT64_ENT_PER_PAGE; ++i) { | |
657 | if (pt[i] & PT_PRESENT_MASK) | |
714b93da | 658 | rmap_remove(vcpu, &pt[i]); |
697fe2e2 AK |
659 | pt[i] = 0; |
660 | } | |
d9e368d6 | 661 | kvm_flush_remote_tlbs(vcpu->kvm); |
697fe2e2 AK |
662 | return; |
663 | } | |
664 | ||
665 | for (i = 0; i < PT64_ENT_PER_PAGE; ++i) { | |
666 | ent = pt[i]; | |
667 | ||
668 | pt[i] = 0; | |
669 | if (!(ent & PT_PRESENT_MASK)) | |
670 | continue; | |
671 | ent &= PT64_BASE_ADDR_MASK; | |
714b93da | 672 | mmu_page_remove_parent_pte(vcpu, page_header(ent), &pt[i]); |
697fe2e2 | 673 | } |
d9e368d6 | 674 | kvm_flush_remote_tlbs(vcpu->kvm); |
a436036b AK |
675 | } |
676 | ||
cea0f0e7 AK |
677 | static void kvm_mmu_put_page(struct kvm_vcpu *vcpu, |
678 | struct kvm_mmu_page *page, | |
679 | u64 *parent_pte) | |
680 | { | |
714b93da | 681 | mmu_page_remove_parent_pte(vcpu, page, parent_pte); |
a436036b AK |
682 | } |
683 | ||
684 | static void kvm_mmu_zap_page(struct kvm_vcpu *vcpu, | |
685 | struct kvm_mmu_page *page) | |
686 | { | |
687 | u64 *parent_pte; | |
688 | ||
689 | while (page->multimapped || page->parent_pte) { | |
690 | if (!page->multimapped) | |
691 | parent_pte = page->parent_pte; | |
692 | else { | |
693 | struct kvm_pte_chain *chain; | |
694 | ||
695 | chain = container_of(page->parent_ptes.first, | |
696 | struct kvm_pte_chain, link); | |
697 | parent_pte = chain->parent_ptes[0]; | |
698 | } | |
697fe2e2 | 699 | BUG_ON(!parent_pte); |
a436036b | 700 | kvm_mmu_put_page(vcpu, page, parent_pte); |
e663ee64 | 701 | set_shadow_pte(parent_pte, 0); |
a436036b | 702 | } |
cc4529ef | 703 | kvm_mmu_page_unlink_children(vcpu, page); |
3bb65a22 AK |
704 | if (!page->root_count) { |
705 | hlist_del(&page->hash_link); | |
4b02d6da | 706 | kvm_mmu_free_page(vcpu, page); |
36868f7b AK |
707 | } else |
708 | list_move(&page->link, &vcpu->kvm->active_mmu_pages); | |
a436036b AK |
709 | } |
710 | ||
711 | static int kvm_mmu_unprotect_page(struct kvm_vcpu *vcpu, gfn_t gfn) | |
712 | { | |
713 | unsigned index; | |
714 | struct hlist_head *bucket; | |
715 | struct kvm_mmu_page *page; | |
716 | struct hlist_node *node, *n; | |
717 | int r; | |
718 | ||
719 | pgprintk("%s: looking for gfn %lx\n", __FUNCTION__, gfn); | |
720 | r = 0; | |
721 | index = kvm_page_table_hashfn(gfn) % KVM_NUM_MMU_PAGES; | |
722 | bucket = &vcpu->kvm->mmu_page_hash[index]; | |
723 | hlist_for_each_entry_safe(page, node, n, bucket, hash_link) | |
724 | if (page->gfn == gfn && !page->role.metaphysical) { | |
697fe2e2 AK |
725 | pgprintk("%s: gfn %lx role %x\n", __FUNCTION__, gfn, |
726 | page->role.word); | |
a436036b AK |
727 | kvm_mmu_zap_page(vcpu, page); |
728 | r = 1; | |
729 | } | |
730 | return r; | |
cea0f0e7 AK |
731 | } |
732 | ||
97a0a01e AK |
733 | static void mmu_unshadow(struct kvm_vcpu *vcpu, gfn_t gfn) |
734 | { | |
735 | struct kvm_mmu_page *page; | |
736 | ||
737 | while ((page = kvm_mmu_lookup_page(vcpu, gfn)) != NULL) { | |
738 | pgprintk("%s: zap %lx %x\n", | |
739 | __FUNCTION__, gfn, page->role.word); | |
740 | kvm_mmu_zap_page(vcpu, page); | |
741 | } | |
742 | } | |
743 | ||
6aa8b732 AK |
744 | static void page_header_update_slot(struct kvm *kvm, void *pte, gpa_t gpa) |
745 | { | |
746 | int slot = memslot_id(kvm, gfn_to_memslot(kvm, gpa >> PAGE_SHIFT)); | |
747 | struct kvm_mmu_page *page_head = page_header(__pa(pte)); | |
748 | ||
749 | __set_bit(slot, &page_head->slot_bitmap); | |
750 | } | |
751 | ||
752 | hpa_t safe_gpa_to_hpa(struct kvm_vcpu *vcpu, gpa_t gpa) | |
753 | { | |
754 | hpa_t hpa = gpa_to_hpa(vcpu, gpa); | |
755 | ||
756 | return is_error_hpa(hpa) ? bad_page_address | (gpa & ~PAGE_MASK): hpa; | |
757 | } | |
758 | ||
759 | hpa_t gpa_to_hpa(struct kvm_vcpu *vcpu, gpa_t gpa) | |
760 | { | |
6aa8b732 AK |
761 | struct page *page; |
762 | ||
763 | ASSERT((gpa & HPA_ERR_MASK) == 0); | |
954bbbc2 AK |
764 | page = gfn_to_page(vcpu->kvm, gpa >> PAGE_SHIFT); |
765 | if (!page) | |
6aa8b732 | 766 | return gpa | HPA_ERR_MASK; |
6aa8b732 AK |
767 | return ((hpa_t)page_to_pfn(page) << PAGE_SHIFT) |
768 | | (gpa & (PAGE_SIZE-1)); | |
769 | } | |
770 | ||
771 | hpa_t gva_to_hpa(struct kvm_vcpu *vcpu, gva_t gva) | |
772 | { | |
773 | gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, gva); | |
774 | ||
775 | if (gpa == UNMAPPED_GVA) | |
776 | return UNMAPPED_GVA; | |
777 | return gpa_to_hpa(vcpu, gpa); | |
778 | } | |
779 | ||
039576c0 AK |
780 | struct page *gva_to_page(struct kvm_vcpu *vcpu, gva_t gva) |
781 | { | |
782 | gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, gva); | |
783 | ||
784 | if (gpa == UNMAPPED_GVA) | |
785 | return NULL; | |
786 | return pfn_to_page(gpa_to_hpa(vcpu, gpa) >> PAGE_SHIFT); | |
787 | } | |
788 | ||
6aa8b732 AK |
789 | static void nonpaging_new_cr3(struct kvm_vcpu *vcpu) |
790 | { | |
791 | } | |
792 | ||
793 | static int nonpaging_map(struct kvm_vcpu *vcpu, gva_t v, hpa_t p) | |
794 | { | |
795 | int level = PT32E_ROOT_LEVEL; | |
796 | hpa_t table_addr = vcpu->mmu.root_hpa; | |
797 | ||
798 | for (; ; level--) { | |
799 | u32 index = PT64_INDEX(v, level); | |
800 | u64 *table; | |
cea0f0e7 | 801 | u64 pte; |
6aa8b732 AK |
802 | |
803 | ASSERT(VALID_PAGE(table_addr)); | |
804 | table = __va(table_addr); | |
805 | ||
806 | if (level == 1) { | |
cea0f0e7 AK |
807 | pte = table[index]; |
808 | if (is_present_pte(pte) && is_writeble_pte(pte)) | |
809 | return 0; | |
6aa8b732 AK |
810 | mark_page_dirty(vcpu->kvm, v >> PAGE_SHIFT); |
811 | page_header_update_slot(vcpu->kvm, table, v); | |
812 | table[index] = p | PT_PRESENT_MASK | PT_WRITABLE_MASK | | |
813 | PT_USER_MASK; | |
714b93da | 814 | rmap_add(vcpu, &table[index]); |
6aa8b732 AK |
815 | return 0; |
816 | } | |
817 | ||
818 | if (table[index] == 0) { | |
25c0de2c | 819 | struct kvm_mmu_page *new_table; |
cea0f0e7 | 820 | gfn_t pseudo_gfn; |
6aa8b732 | 821 | |
cea0f0e7 AK |
822 | pseudo_gfn = (v & PT64_DIR_BASE_ADDR_MASK) |
823 | >> PAGE_SHIFT; | |
824 | new_table = kvm_mmu_get_page(vcpu, pseudo_gfn, | |
825 | v, level - 1, | |
d28c6cfb | 826 | 1, 0, &table[index]); |
25c0de2c | 827 | if (!new_table) { |
6aa8b732 AK |
828 | pgprintk("nonpaging_map: ENOMEM\n"); |
829 | return -ENOMEM; | |
830 | } | |
831 | ||
47ad8e68 | 832 | table[index] = __pa(new_table->spt) | PT_PRESENT_MASK |
25c0de2c | 833 | | PT_WRITABLE_MASK | PT_USER_MASK; |
6aa8b732 AK |
834 | } |
835 | table_addr = table[index] & PT64_BASE_ADDR_MASK; | |
836 | } | |
837 | } | |
838 | ||
17ac10ad AK |
839 | static void mmu_free_roots(struct kvm_vcpu *vcpu) |
840 | { | |
841 | int i; | |
3bb65a22 | 842 | struct kvm_mmu_page *page; |
17ac10ad | 843 | |
7b53aa56 AK |
844 | if (!VALID_PAGE(vcpu->mmu.root_hpa)) |
845 | return; | |
17ac10ad AK |
846 | #ifdef CONFIG_X86_64 |
847 | if (vcpu->mmu.shadow_root_level == PT64_ROOT_LEVEL) { | |
848 | hpa_t root = vcpu->mmu.root_hpa; | |
849 | ||
3bb65a22 AK |
850 | page = page_header(root); |
851 | --page->root_count; | |
17ac10ad AK |
852 | vcpu->mmu.root_hpa = INVALID_PAGE; |
853 | return; | |
854 | } | |
855 | #endif | |
856 | for (i = 0; i < 4; ++i) { | |
857 | hpa_t root = vcpu->mmu.pae_root[i]; | |
858 | ||
417726a3 | 859 | if (root) { |
417726a3 AK |
860 | root &= PT64_BASE_ADDR_MASK; |
861 | page = page_header(root); | |
862 | --page->root_count; | |
863 | } | |
17ac10ad AK |
864 | vcpu->mmu.pae_root[i] = INVALID_PAGE; |
865 | } | |
866 | vcpu->mmu.root_hpa = INVALID_PAGE; | |
867 | } | |
868 | ||
869 | static void mmu_alloc_roots(struct kvm_vcpu *vcpu) | |
870 | { | |
871 | int i; | |
cea0f0e7 | 872 | gfn_t root_gfn; |
3bb65a22 AK |
873 | struct kvm_mmu_page *page; |
874 | ||
cea0f0e7 | 875 | root_gfn = vcpu->cr3 >> PAGE_SHIFT; |
17ac10ad AK |
876 | |
877 | #ifdef CONFIG_X86_64 | |
878 | if (vcpu->mmu.shadow_root_level == PT64_ROOT_LEVEL) { | |
879 | hpa_t root = vcpu->mmu.root_hpa; | |
880 | ||
881 | ASSERT(!VALID_PAGE(root)); | |
68a99f6d | 882 | page = kvm_mmu_get_page(vcpu, root_gfn, 0, |
d28c6cfb | 883 | PT64_ROOT_LEVEL, 0, 0, NULL); |
47ad8e68 | 884 | root = __pa(page->spt); |
3bb65a22 | 885 | ++page->root_count; |
17ac10ad AK |
886 | vcpu->mmu.root_hpa = root; |
887 | return; | |
888 | } | |
889 | #endif | |
890 | for (i = 0; i < 4; ++i) { | |
891 | hpa_t root = vcpu->mmu.pae_root[i]; | |
892 | ||
893 | ASSERT(!VALID_PAGE(root)); | |
417726a3 AK |
894 | if (vcpu->mmu.root_level == PT32E_ROOT_LEVEL) { |
895 | if (!is_present_pte(vcpu->pdptrs[i])) { | |
896 | vcpu->mmu.pae_root[i] = 0; | |
897 | continue; | |
898 | } | |
cea0f0e7 | 899 | root_gfn = vcpu->pdptrs[i] >> PAGE_SHIFT; |
417726a3 | 900 | } else if (vcpu->mmu.root_level == 0) |
cea0f0e7 | 901 | root_gfn = 0; |
68a99f6d | 902 | page = kvm_mmu_get_page(vcpu, root_gfn, i << 30, |
cea0f0e7 | 903 | PT32_ROOT_LEVEL, !is_paging(vcpu), |
d28c6cfb | 904 | 0, NULL); |
47ad8e68 | 905 | root = __pa(page->spt); |
3bb65a22 | 906 | ++page->root_count; |
17ac10ad AK |
907 | vcpu->mmu.pae_root[i] = root | PT_PRESENT_MASK; |
908 | } | |
909 | vcpu->mmu.root_hpa = __pa(vcpu->mmu.pae_root); | |
910 | } | |
911 | ||
6aa8b732 AK |
912 | static gpa_t nonpaging_gva_to_gpa(struct kvm_vcpu *vcpu, gva_t vaddr) |
913 | { | |
914 | return vaddr; | |
915 | } | |
916 | ||
917 | static int nonpaging_page_fault(struct kvm_vcpu *vcpu, gva_t gva, | |
918 | u32 error_code) | |
919 | { | |
6aa8b732 | 920 | gpa_t addr = gva; |
ebeace86 | 921 | hpa_t paddr; |
e2dec939 | 922 | int r; |
6aa8b732 | 923 | |
e2dec939 AK |
924 | r = mmu_topup_memory_caches(vcpu); |
925 | if (r) | |
926 | return r; | |
714b93da | 927 | |
6aa8b732 AK |
928 | ASSERT(vcpu); |
929 | ASSERT(VALID_PAGE(vcpu->mmu.root_hpa)); | |
930 | ||
6aa8b732 | 931 | |
ebeace86 | 932 | paddr = gpa_to_hpa(vcpu , addr & PT64_BASE_ADDR_MASK); |
6aa8b732 | 933 | |
ebeace86 AK |
934 | if (is_error_hpa(paddr)) |
935 | return 1; | |
6aa8b732 | 936 | |
ebeace86 | 937 | return nonpaging_map(vcpu, addr & PAGE_MASK, paddr); |
6aa8b732 AK |
938 | } |
939 | ||
6aa8b732 AK |
940 | static void nonpaging_free(struct kvm_vcpu *vcpu) |
941 | { | |
17ac10ad | 942 | mmu_free_roots(vcpu); |
6aa8b732 AK |
943 | } |
944 | ||
945 | static int nonpaging_init_context(struct kvm_vcpu *vcpu) | |
946 | { | |
947 | struct kvm_mmu *context = &vcpu->mmu; | |
948 | ||
949 | context->new_cr3 = nonpaging_new_cr3; | |
950 | context->page_fault = nonpaging_page_fault; | |
6aa8b732 AK |
951 | context->gva_to_gpa = nonpaging_gva_to_gpa; |
952 | context->free = nonpaging_free; | |
cea0f0e7 | 953 | context->root_level = 0; |
6aa8b732 | 954 | context->shadow_root_level = PT32E_ROOT_LEVEL; |
17c3ba9d | 955 | context->root_hpa = INVALID_PAGE; |
6aa8b732 AK |
956 | return 0; |
957 | } | |
958 | ||
6aa8b732 AK |
959 | static void kvm_mmu_flush_tlb(struct kvm_vcpu *vcpu) |
960 | { | |
1165f5fe | 961 | ++vcpu->stat.tlb_flush; |
6aa8b732 AK |
962 | kvm_arch_ops->tlb_flush(vcpu); |
963 | } | |
964 | ||
965 | static void paging_new_cr3(struct kvm_vcpu *vcpu) | |
966 | { | |
374cbac0 | 967 | pgprintk("%s: cr3 %lx\n", __FUNCTION__, vcpu->cr3); |
cea0f0e7 | 968 | mmu_free_roots(vcpu); |
6aa8b732 AK |
969 | } |
970 | ||
6aa8b732 AK |
971 | static void inject_page_fault(struct kvm_vcpu *vcpu, |
972 | u64 addr, | |
973 | u32 err_code) | |
974 | { | |
975 | kvm_arch_ops->inject_page_fault(vcpu, addr, err_code); | |
976 | } | |
977 | ||
6aa8b732 AK |
978 | static void paging_free(struct kvm_vcpu *vcpu) |
979 | { | |
980 | nonpaging_free(vcpu); | |
981 | } | |
982 | ||
983 | #define PTTYPE 64 | |
984 | #include "paging_tmpl.h" | |
985 | #undef PTTYPE | |
986 | ||
987 | #define PTTYPE 32 | |
988 | #include "paging_tmpl.h" | |
989 | #undef PTTYPE | |
990 | ||
17ac10ad | 991 | static int paging64_init_context_common(struct kvm_vcpu *vcpu, int level) |
6aa8b732 AK |
992 | { |
993 | struct kvm_mmu *context = &vcpu->mmu; | |
994 | ||
995 | ASSERT(is_pae(vcpu)); | |
996 | context->new_cr3 = paging_new_cr3; | |
997 | context->page_fault = paging64_page_fault; | |
6aa8b732 AK |
998 | context->gva_to_gpa = paging64_gva_to_gpa; |
999 | context->free = paging_free; | |
17ac10ad AK |
1000 | context->root_level = level; |
1001 | context->shadow_root_level = level; | |
17c3ba9d | 1002 | context->root_hpa = INVALID_PAGE; |
6aa8b732 AK |
1003 | return 0; |
1004 | } | |
1005 | ||
17ac10ad AK |
1006 | static int paging64_init_context(struct kvm_vcpu *vcpu) |
1007 | { | |
1008 | return paging64_init_context_common(vcpu, PT64_ROOT_LEVEL); | |
1009 | } | |
1010 | ||
6aa8b732 AK |
1011 | static int paging32_init_context(struct kvm_vcpu *vcpu) |
1012 | { | |
1013 | struct kvm_mmu *context = &vcpu->mmu; | |
1014 | ||
1015 | context->new_cr3 = paging_new_cr3; | |
1016 | context->page_fault = paging32_page_fault; | |
6aa8b732 AK |
1017 | context->gva_to_gpa = paging32_gva_to_gpa; |
1018 | context->free = paging_free; | |
1019 | context->root_level = PT32_ROOT_LEVEL; | |
1020 | context->shadow_root_level = PT32E_ROOT_LEVEL; | |
17c3ba9d | 1021 | context->root_hpa = INVALID_PAGE; |
6aa8b732 AK |
1022 | return 0; |
1023 | } | |
1024 | ||
1025 | static int paging32E_init_context(struct kvm_vcpu *vcpu) | |
1026 | { | |
17ac10ad | 1027 | return paging64_init_context_common(vcpu, PT32E_ROOT_LEVEL); |
6aa8b732 AK |
1028 | } |
1029 | ||
1030 | static int init_kvm_mmu(struct kvm_vcpu *vcpu) | |
1031 | { | |
1032 | ASSERT(vcpu); | |
1033 | ASSERT(!VALID_PAGE(vcpu->mmu.root_hpa)); | |
1034 | ||
1035 | if (!is_paging(vcpu)) | |
1036 | return nonpaging_init_context(vcpu); | |
a9058ecd | 1037 | else if (is_long_mode(vcpu)) |
6aa8b732 AK |
1038 | return paging64_init_context(vcpu); |
1039 | else if (is_pae(vcpu)) | |
1040 | return paging32E_init_context(vcpu); | |
1041 | else | |
1042 | return paging32_init_context(vcpu); | |
1043 | } | |
1044 | ||
1045 | static void destroy_kvm_mmu(struct kvm_vcpu *vcpu) | |
1046 | { | |
1047 | ASSERT(vcpu); | |
1048 | if (VALID_PAGE(vcpu->mmu.root_hpa)) { | |
1049 | vcpu->mmu.free(vcpu); | |
1050 | vcpu->mmu.root_hpa = INVALID_PAGE; | |
1051 | } | |
1052 | } | |
1053 | ||
1054 | int kvm_mmu_reset_context(struct kvm_vcpu *vcpu) | |
17c3ba9d AK |
1055 | { |
1056 | destroy_kvm_mmu(vcpu); | |
1057 | return init_kvm_mmu(vcpu); | |
1058 | } | |
1059 | ||
1060 | int kvm_mmu_load(struct kvm_vcpu *vcpu) | |
6aa8b732 | 1061 | { |
714b93da AK |
1062 | int r; |
1063 | ||
17c3ba9d | 1064 | spin_lock(&vcpu->kvm->lock); |
e2dec939 | 1065 | r = mmu_topup_memory_caches(vcpu); |
17c3ba9d AK |
1066 | if (r) |
1067 | goto out; | |
1068 | mmu_alloc_roots(vcpu); | |
1069 | kvm_arch_ops->set_cr3(vcpu, vcpu->mmu.root_hpa); | |
1070 | kvm_mmu_flush_tlb(vcpu); | |
714b93da | 1071 | out: |
17c3ba9d | 1072 | spin_unlock(&vcpu->kvm->lock); |
714b93da | 1073 | return r; |
6aa8b732 | 1074 | } |
17c3ba9d AK |
1075 | EXPORT_SYMBOL_GPL(kvm_mmu_load); |
1076 | ||
1077 | void kvm_mmu_unload(struct kvm_vcpu *vcpu) | |
1078 | { | |
1079 | mmu_free_roots(vcpu); | |
1080 | } | |
6aa8b732 | 1081 | |
09072daf | 1082 | static void mmu_pte_write_zap_pte(struct kvm_vcpu *vcpu, |
ac1b714e AK |
1083 | struct kvm_mmu_page *page, |
1084 | u64 *spte) | |
1085 | { | |
1086 | u64 pte; | |
1087 | struct kvm_mmu_page *child; | |
1088 | ||
1089 | pte = *spte; | |
1090 | if (is_present_pte(pte)) { | |
1091 | if (page->role.level == PT_PAGE_TABLE_LEVEL) | |
1092 | rmap_remove(vcpu, spte); | |
1093 | else { | |
1094 | child = page_header(pte & PT64_BASE_ADDR_MASK); | |
1095 | mmu_page_remove_parent_pte(vcpu, child, spte); | |
1096 | } | |
1097 | } | |
1098 | *spte = 0; | |
d9e368d6 | 1099 | kvm_flush_remote_tlbs(vcpu->kvm); |
ac1b714e AK |
1100 | } |
1101 | ||
0028425f AK |
1102 | static void mmu_pte_write_new_pte(struct kvm_vcpu *vcpu, |
1103 | struct kvm_mmu_page *page, | |
1104 | u64 *spte, | |
1105 | const void *new, int bytes) | |
1106 | { | |
1107 | if (page->role.level != PT_PAGE_TABLE_LEVEL) | |
1108 | return; | |
1109 | ||
1110 | if (page->role.glevels == PT32_ROOT_LEVEL) | |
1111 | paging32_update_pte(vcpu, page, spte, new, bytes); | |
1112 | else | |
1113 | paging64_update_pte(vcpu, page, spte, new, bytes); | |
1114 | } | |
1115 | ||
09072daf AK |
1116 | void kvm_mmu_pte_write(struct kvm_vcpu *vcpu, gpa_t gpa, |
1117 | const u8 *old, const u8 *new, int bytes) | |
da4a00f0 | 1118 | { |
9b7a0325 AK |
1119 | gfn_t gfn = gpa >> PAGE_SHIFT; |
1120 | struct kvm_mmu_page *page; | |
0e7bc4b9 | 1121 | struct hlist_node *node, *n; |
9b7a0325 AK |
1122 | struct hlist_head *bucket; |
1123 | unsigned index; | |
1124 | u64 *spte; | |
9b7a0325 | 1125 | unsigned offset = offset_in_page(gpa); |
0e7bc4b9 | 1126 | unsigned pte_size; |
9b7a0325 | 1127 | unsigned page_offset; |
0e7bc4b9 | 1128 | unsigned misaligned; |
fce0657f | 1129 | unsigned quadrant; |
9b7a0325 | 1130 | int level; |
86a5ba02 | 1131 | int flooded = 0; |
ac1b714e | 1132 | int npte; |
9b7a0325 | 1133 | |
da4a00f0 | 1134 | pgprintk("%s: gpa %llx bytes %d\n", __FUNCTION__, gpa, bytes); |
86a5ba02 AK |
1135 | if (gfn == vcpu->last_pt_write_gfn) { |
1136 | ++vcpu->last_pt_write_count; | |
1137 | if (vcpu->last_pt_write_count >= 3) | |
1138 | flooded = 1; | |
1139 | } else { | |
1140 | vcpu->last_pt_write_gfn = gfn; | |
1141 | vcpu->last_pt_write_count = 1; | |
1142 | } | |
9b7a0325 AK |
1143 | index = kvm_page_table_hashfn(gfn) % KVM_NUM_MMU_PAGES; |
1144 | bucket = &vcpu->kvm->mmu_page_hash[index]; | |
0e7bc4b9 | 1145 | hlist_for_each_entry_safe(page, node, n, bucket, hash_link) { |
9b7a0325 AK |
1146 | if (page->gfn != gfn || page->role.metaphysical) |
1147 | continue; | |
0e7bc4b9 AK |
1148 | pte_size = page->role.glevels == PT32_ROOT_LEVEL ? 4 : 8; |
1149 | misaligned = (offset ^ (offset + bytes - 1)) & ~(pte_size - 1); | |
e925c5ba | 1150 | misaligned |= bytes < 4; |
86a5ba02 | 1151 | if (misaligned || flooded) { |
0e7bc4b9 AK |
1152 | /* |
1153 | * Misaligned accesses are too much trouble to fix | |
1154 | * up; also, they usually indicate a page is not used | |
1155 | * as a page table. | |
86a5ba02 AK |
1156 | * |
1157 | * If we're seeing too many writes to a page, | |
1158 | * it may no longer be a page table, or we may be | |
1159 | * forking, in which case it is better to unmap the | |
1160 | * page. | |
0e7bc4b9 AK |
1161 | */ |
1162 | pgprintk("misaligned: gpa %llx bytes %d role %x\n", | |
1163 | gpa, bytes, page->role.word); | |
1164 | kvm_mmu_zap_page(vcpu, page); | |
1165 | continue; | |
1166 | } | |
9b7a0325 AK |
1167 | page_offset = offset; |
1168 | level = page->role.level; | |
ac1b714e | 1169 | npte = 1; |
9b7a0325 | 1170 | if (page->role.glevels == PT32_ROOT_LEVEL) { |
ac1b714e AK |
1171 | page_offset <<= 1; /* 32->64 */ |
1172 | /* | |
1173 | * A 32-bit pde maps 4MB while the shadow pdes map | |
1174 | * only 2MB. So we need to double the offset again | |
1175 | * and zap two pdes instead of one. | |
1176 | */ | |
1177 | if (level == PT32_ROOT_LEVEL) { | |
6b8d0f9b | 1178 | page_offset &= ~7; /* kill rounding error */ |
ac1b714e AK |
1179 | page_offset <<= 1; |
1180 | npte = 2; | |
1181 | } | |
fce0657f | 1182 | quadrant = page_offset >> PAGE_SHIFT; |
9b7a0325 | 1183 | page_offset &= ~PAGE_MASK; |
fce0657f AK |
1184 | if (quadrant != page->role.quadrant) |
1185 | continue; | |
9b7a0325 | 1186 | } |
47ad8e68 | 1187 | spte = &page->spt[page_offset / sizeof(*spte)]; |
ac1b714e | 1188 | while (npte--) { |
09072daf | 1189 | mmu_pte_write_zap_pte(vcpu, page, spte); |
0028425f | 1190 | mmu_pte_write_new_pte(vcpu, page, spte, new, bytes); |
ac1b714e | 1191 | ++spte; |
9b7a0325 | 1192 | } |
9b7a0325 | 1193 | } |
da4a00f0 AK |
1194 | } |
1195 | ||
a436036b AK |
1196 | int kvm_mmu_unprotect_page_virt(struct kvm_vcpu *vcpu, gva_t gva) |
1197 | { | |
1198 | gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, gva); | |
1199 | ||
1200 | return kvm_mmu_unprotect_page(vcpu, gpa >> PAGE_SHIFT); | |
1201 | } | |
1202 | ||
ebeace86 AK |
1203 | void kvm_mmu_free_some_pages(struct kvm_vcpu *vcpu) |
1204 | { | |
1205 | while (vcpu->kvm->n_free_mmu_pages < KVM_REFILL_PAGES) { | |
1206 | struct kvm_mmu_page *page; | |
1207 | ||
1208 | page = container_of(vcpu->kvm->active_mmu_pages.prev, | |
1209 | struct kvm_mmu_page, link); | |
1210 | kvm_mmu_zap_page(vcpu, page); | |
1211 | } | |
1212 | } | |
1213 | EXPORT_SYMBOL_GPL(kvm_mmu_free_some_pages); | |
1214 | ||
6aa8b732 AK |
1215 | static void free_mmu_pages(struct kvm_vcpu *vcpu) |
1216 | { | |
f51234c2 | 1217 | struct kvm_mmu_page *page; |
6aa8b732 | 1218 | |
f51234c2 AK |
1219 | while (!list_empty(&vcpu->kvm->active_mmu_pages)) { |
1220 | page = container_of(vcpu->kvm->active_mmu_pages.next, | |
1221 | struct kvm_mmu_page, link); | |
1222 | kvm_mmu_zap_page(vcpu, page); | |
1223 | } | |
17ac10ad | 1224 | free_page((unsigned long)vcpu->mmu.pae_root); |
6aa8b732 AK |
1225 | } |
1226 | ||
1227 | static int alloc_mmu_pages(struct kvm_vcpu *vcpu) | |
1228 | { | |
17ac10ad | 1229 | struct page *page; |
6aa8b732 AK |
1230 | int i; |
1231 | ||
1232 | ASSERT(vcpu); | |
1233 | ||
d3d25b04 | 1234 | vcpu->kvm->n_free_mmu_pages = KVM_NUM_MMU_PAGES; |
17ac10ad AK |
1235 | |
1236 | /* | |
1237 | * When emulating 32-bit mode, cr3 is only 32 bits even on x86_64. | |
1238 | * Therefore we need to allocate shadow page tables in the first | |
1239 | * 4GB of memory, which happens to fit the DMA32 zone. | |
1240 | */ | |
1241 | page = alloc_page(GFP_KERNEL | __GFP_DMA32); | |
1242 | if (!page) | |
1243 | goto error_1; | |
1244 | vcpu->mmu.pae_root = page_address(page); | |
1245 | for (i = 0; i < 4; ++i) | |
1246 | vcpu->mmu.pae_root[i] = INVALID_PAGE; | |
1247 | ||
6aa8b732 AK |
1248 | return 0; |
1249 | ||
1250 | error_1: | |
1251 | free_mmu_pages(vcpu); | |
1252 | return -ENOMEM; | |
1253 | } | |
1254 | ||
8018c27b | 1255 | int kvm_mmu_create(struct kvm_vcpu *vcpu) |
6aa8b732 | 1256 | { |
6aa8b732 AK |
1257 | ASSERT(vcpu); |
1258 | ASSERT(!VALID_PAGE(vcpu->mmu.root_hpa)); | |
6aa8b732 | 1259 | |
8018c27b IM |
1260 | return alloc_mmu_pages(vcpu); |
1261 | } | |
6aa8b732 | 1262 | |
8018c27b IM |
1263 | int kvm_mmu_setup(struct kvm_vcpu *vcpu) |
1264 | { | |
1265 | ASSERT(vcpu); | |
1266 | ASSERT(!VALID_PAGE(vcpu->mmu.root_hpa)); | |
2c264957 | 1267 | |
8018c27b | 1268 | return init_kvm_mmu(vcpu); |
6aa8b732 AK |
1269 | } |
1270 | ||
1271 | void kvm_mmu_destroy(struct kvm_vcpu *vcpu) | |
1272 | { | |
1273 | ASSERT(vcpu); | |
1274 | ||
1275 | destroy_kvm_mmu(vcpu); | |
1276 | free_mmu_pages(vcpu); | |
714b93da | 1277 | mmu_free_memory_caches(vcpu); |
6aa8b732 AK |
1278 | } |
1279 | ||
714b93da | 1280 | void kvm_mmu_slot_remove_write_access(struct kvm_vcpu *vcpu, int slot) |
6aa8b732 | 1281 | { |
714b93da | 1282 | struct kvm *kvm = vcpu->kvm; |
6aa8b732 AK |
1283 | struct kvm_mmu_page *page; |
1284 | ||
1285 | list_for_each_entry(page, &kvm->active_mmu_pages, link) { | |
1286 | int i; | |
1287 | u64 *pt; | |
1288 | ||
1289 | if (!test_bit(slot, &page->slot_bitmap)) | |
1290 | continue; | |
1291 | ||
47ad8e68 | 1292 | pt = page->spt; |
6aa8b732 AK |
1293 | for (i = 0; i < PT64_ENT_PER_PAGE; ++i) |
1294 | /* avoid RMW */ | |
cd4a4e53 | 1295 | if (pt[i] & PT_WRITABLE_MASK) { |
714b93da | 1296 | rmap_remove(vcpu, &pt[i]); |
6aa8b732 | 1297 | pt[i] &= ~PT_WRITABLE_MASK; |
cd4a4e53 | 1298 | } |
6aa8b732 AK |
1299 | } |
1300 | } | |
37a7d8b0 | 1301 | |
e0fa826f DL |
1302 | void kvm_mmu_zap_all(struct kvm_vcpu *vcpu) |
1303 | { | |
1304 | destroy_kvm_mmu(vcpu); | |
1305 | ||
1306 | while (!list_empty(&vcpu->kvm->active_mmu_pages)) { | |
1307 | struct kvm_mmu_page *page; | |
1308 | ||
1309 | page = container_of(vcpu->kvm->active_mmu_pages.next, | |
1310 | struct kvm_mmu_page, link); | |
1311 | kvm_mmu_zap_page(vcpu, page); | |
1312 | } | |
1313 | ||
1314 | mmu_free_memory_caches(vcpu); | |
d9e368d6 | 1315 | kvm_flush_remote_tlbs(vcpu->kvm); |
e0fa826f DL |
1316 | init_kvm_mmu(vcpu); |
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_cache) |
1326 | kmem_cache_destroy(mmu_page_cache); | |
1327 | if (mmu_page_header_cache) | |
1328 | kmem_cache_destroy(mmu_page_header_cache); | |
b5a33a75 AK |
1329 | } |
1330 | ||
1331 | int kvm_mmu_module_init(void) | |
1332 | { | |
1333 | pte_chain_cache = kmem_cache_create("kvm_pte_chain", | |
1334 | sizeof(struct kvm_pte_chain), | |
20c2df83 | 1335 | 0, 0, NULL); |
b5a33a75 AK |
1336 | if (!pte_chain_cache) |
1337 | goto nomem; | |
1338 | rmap_desc_cache = kmem_cache_create("kvm_rmap_desc", | |
1339 | sizeof(struct kvm_rmap_desc), | |
20c2df83 | 1340 | 0, 0, NULL); |
b5a33a75 AK |
1341 | if (!rmap_desc_cache) |
1342 | goto nomem; | |
1343 | ||
d3d25b04 AK |
1344 | mmu_page_cache = kmem_cache_create("kvm_mmu_page", |
1345 | PAGE_SIZE, | |
20c2df83 | 1346 | PAGE_SIZE, 0, NULL); |
d3d25b04 AK |
1347 | if (!mmu_page_cache) |
1348 | goto nomem; | |
1349 | ||
1350 | mmu_page_header_cache = kmem_cache_create("kvm_mmu_page_header", | |
1351 | sizeof(struct kvm_mmu_page), | |
20c2df83 | 1352 | 0, 0, NULL); |
d3d25b04 AK |
1353 | if (!mmu_page_header_cache) |
1354 | goto nomem; | |
1355 | ||
b5a33a75 AK |
1356 | return 0; |
1357 | ||
1358 | nomem: | |
1359 | kvm_mmu_module_exit(); | |
1360 | return -ENOMEM; | |
1361 | } | |
1362 | ||
37a7d8b0 AK |
1363 | #ifdef AUDIT |
1364 | ||
1365 | static const char *audit_msg; | |
1366 | ||
1367 | static gva_t canonicalize(gva_t gva) | |
1368 | { | |
1369 | #ifdef CONFIG_X86_64 | |
1370 | gva = (long long)(gva << 16) >> 16; | |
1371 | #endif | |
1372 | return gva; | |
1373 | } | |
1374 | ||
1375 | static void audit_mappings_page(struct kvm_vcpu *vcpu, u64 page_pte, | |
1376 | gva_t va, int level) | |
1377 | { | |
1378 | u64 *pt = __va(page_pte & PT64_BASE_ADDR_MASK); | |
1379 | int i; | |
1380 | gva_t va_delta = 1ul << (PAGE_SHIFT + 9 * (level - 1)); | |
1381 | ||
1382 | for (i = 0; i < PT64_ENT_PER_PAGE; ++i, va += va_delta) { | |
1383 | u64 ent = pt[i]; | |
1384 | ||
2807696c | 1385 | if (!(ent & PT_PRESENT_MASK)) |
37a7d8b0 AK |
1386 | continue; |
1387 | ||
1388 | va = canonicalize(va); | |
1389 | if (level > 1) | |
1390 | audit_mappings_page(vcpu, ent, va, level - 1); | |
1391 | else { | |
1392 | gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, va); | |
1393 | hpa_t hpa = gpa_to_hpa(vcpu, gpa); | |
1394 | ||
1395 | if ((ent & PT_PRESENT_MASK) | |
1396 | && (ent & PT64_BASE_ADDR_MASK) != hpa) | |
1397 | printk(KERN_ERR "audit error: (%s) levels %d" | |
1398 | " gva %lx gpa %llx hpa %llx ent %llx\n", | |
1399 | audit_msg, vcpu->mmu.root_level, | |
1400 | va, gpa, hpa, ent); | |
1401 | } | |
1402 | } | |
1403 | } | |
1404 | ||
1405 | static void audit_mappings(struct kvm_vcpu *vcpu) | |
1406 | { | |
1ea252af | 1407 | unsigned i; |
37a7d8b0 AK |
1408 | |
1409 | if (vcpu->mmu.root_level == 4) | |
1410 | audit_mappings_page(vcpu, vcpu->mmu.root_hpa, 0, 4); | |
1411 | else | |
1412 | for (i = 0; i < 4; ++i) | |
1413 | if (vcpu->mmu.pae_root[i] & PT_PRESENT_MASK) | |
1414 | audit_mappings_page(vcpu, | |
1415 | vcpu->mmu.pae_root[i], | |
1416 | i << 30, | |
1417 | 2); | |
1418 | } | |
1419 | ||
1420 | static int count_rmaps(struct kvm_vcpu *vcpu) | |
1421 | { | |
1422 | int nmaps = 0; | |
1423 | int i, j, k; | |
1424 | ||
1425 | for (i = 0; i < KVM_MEMORY_SLOTS; ++i) { | |
1426 | struct kvm_memory_slot *m = &vcpu->kvm->memslots[i]; | |
1427 | struct kvm_rmap_desc *d; | |
1428 | ||
1429 | for (j = 0; j < m->npages; ++j) { | |
1430 | struct page *page = m->phys_mem[j]; | |
1431 | ||
1432 | if (!page->private) | |
1433 | continue; | |
1434 | if (!(page->private & 1)) { | |
1435 | ++nmaps; | |
1436 | continue; | |
1437 | } | |
1438 | d = (struct kvm_rmap_desc *)(page->private & ~1ul); | |
1439 | while (d) { | |
1440 | for (k = 0; k < RMAP_EXT; ++k) | |
1441 | if (d->shadow_ptes[k]) | |
1442 | ++nmaps; | |
1443 | else | |
1444 | break; | |
1445 | d = d->more; | |
1446 | } | |
1447 | } | |
1448 | } | |
1449 | return nmaps; | |
1450 | } | |
1451 | ||
1452 | static int count_writable_mappings(struct kvm_vcpu *vcpu) | |
1453 | { | |
1454 | int nmaps = 0; | |
1455 | struct kvm_mmu_page *page; | |
1456 | int i; | |
1457 | ||
1458 | list_for_each_entry(page, &vcpu->kvm->active_mmu_pages, link) { | |
47ad8e68 | 1459 | u64 *pt = page->spt; |
37a7d8b0 AK |
1460 | |
1461 | if (page->role.level != PT_PAGE_TABLE_LEVEL) | |
1462 | continue; | |
1463 | ||
1464 | for (i = 0; i < PT64_ENT_PER_PAGE; ++i) { | |
1465 | u64 ent = pt[i]; | |
1466 | ||
1467 | if (!(ent & PT_PRESENT_MASK)) | |
1468 | continue; | |
1469 | if (!(ent & PT_WRITABLE_MASK)) | |
1470 | continue; | |
1471 | ++nmaps; | |
1472 | } | |
1473 | } | |
1474 | return nmaps; | |
1475 | } | |
1476 | ||
1477 | static void audit_rmap(struct kvm_vcpu *vcpu) | |
1478 | { | |
1479 | int n_rmap = count_rmaps(vcpu); | |
1480 | int n_actual = count_writable_mappings(vcpu); | |
1481 | ||
1482 | if (n_rmap != n_actual) | |
1483 | printk(KERN_ERR "%s: (%s) rmap %d actual %d\n", | |
1484 | __FUNCTION__, audit_msg, n_rmap, n_actual); | |
1485 | } | |
1486 | ||
1487 | static void audit_write_protection(struct kvm_vcpu *vcpu) | |
1488 | { | |
1489 | struct kvm_mmu_page *page; | |
1490 | ||
1491 | list_for_each_entry(page, &vcpu->kvm->active_mmu_pages, link) { | |
1492 | hfn_t hfn; | |
1493 | struct page *pg; | |
1494 | ||
1495 | if (page->role.metaphysical) | |
1496 | continue; | |
1497 | ||
1498 | hfn = gpa_to_hpa(vcpu, (gpa_t)page->gfn << PAGE_SHIFT) | |
1499 | >> PAGE_SHIFT; | |
1500 | pg = pfn_to_page(hfn); | |
1501 | if (pg->private) | |
1502 | printk(KERN_ERR "%s: (%s) shadow page has writable" | |
1503 | " mappings: gfn %lx role %x\n", | |
1504 | __FUNCTION__, audit_msg, page->gfn, | |
1505 | page->role.word); | |
1506 | } | |
1507 | } | |
1508 | ||
1509 | static void kvm_mmu_audit(struct kvm_vcpu *vcpu, const char *msg) | |
1510 | { | |
1511 | int olddbg = dbg; | |
1512 | ||
1513 | dbg = 0; | |
1514 | audit_msg = msg; | |
1515 | audit_rmap(vcpu); | |
1516 | audit_write_protection(vcpu); | |
1517 | audit_mappings(vcpu); | |
1518 | dbg = olddbg; | |
1519 | } | |
1520 | ||
1521 | #endif |