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 | */ | |
19 | ||
20 | /* | |
21 | * We need the mmu code to access both 32-bit and 64-bit guest ptes, | |
22 | * so the code in this file is compiled twice, once per pte size. | |
23 | */ | |
24 | ||
25 | #if PTTYPE == 64 | |
26 | #define pt_element_t u64 | |
27 | #define guest_walker guest_walker64 | |
28 | #define FNAME(name) paging##64_##name | |
29 | #define PT_BASE_ADDR_MASK PT64_BASE_ADDR_MASK | |
30 | #define PT_DIR_BASE_ADDR_MASK PT64_DIR_BASE_ADDR_MASK | |
31 | #define PT_INDEX(addr, level) PT64_INDEX(addr, level) | |
32 | #define SHADOW_PT_INDEX(addr, level) PT64_INDEX(addr, level) | |
33 | #define PT_LEVEL_MASK(level) PT64_LEVEL_MASK(level) | |
34 | #define PT_PTE_COPY_MASK PT64_PTE_COPY_MASK | |
cea0f0e7 AK |
35 | #ifdef CONFIG_X86_64 |
36 | #define PT_MAX_FULL_LEVELS 4 | |
37 | #else | |
38 | #define PT_MAX_FULL_LEVELS 2 | |
39 | #endif | |
6aa8b732 AK |
40 | #elif PTTYPE == 32 |
41 | #define pt_element_t u32 | |
42 | #define guest_walker guest_walker32 | |
43 | #define FNAME(name) paging##32_##name | |
44 | #define PT_BASE_ADDR_MASK PT32_BASE_ADDR_MASK | |
45 | #define PT_DIR_BASE_ADDR_MASK PT32_DIR_BASE_ADDR_MASK | |
46 | #define PT_INDEX(addr, level) PT32_INDEX(addr, level) | |
47 | #define SHADOW_PT_INDEX(addr, level) PT64_INDEX(addr, level) | |
48 | #define PT_LEVEL_MASK(level) PT32_LEVEL_MASK(level) | |
49 | #define PT_PTE_COPY_MASK PT32_PTE_COPY_MASK | |
cea0f0e7 | 50 | #define PT_MAX_FULL_LEVELS 2 |
6aa8b732 AK |
51 | #else |
52 | #error Invalid PTTYPE value | |
53 | #endif | |
54 | ||
55 | /* | |
56 | * The guest_walker structure emulates the behavior of the hardware page | |
57 | * table walker. | |
58 | */ | |
59 | struct guest_walker { | |
60 | int level; | |
cea0f0e7 | 61 | gfn_t table_gfn[PT_MAX_FULL_LEVELS]; |
6aa8b732 | 62 | pt_element_t *table; |
ac79c978 | 63 | pt_element_t *ptep; |
6aa8b732 | 64 | pt_element_t inherited_ar; |
815af8d4 | 65 | gfn_t gfn; |
7993ba43 | 66 | u32 error_code; |
6aa8b732 AK |
67 | }; |
68 | ||
ac79c978 AK |
69 | /* |
70 | * Fetch a guest pte for a guest virtual address | |
71 | */ | |
7993ba43 AK |
72 | static int FNAME(walk_addr)(struct guest_walker *walker, |
73 | struct kvm_vcpu *vcpu, gva_t addr, | |
73b1087e | 74 | int write_fault, int user_fault, int fetch_fault) |
6aa8b732 AK |
75 | { |
76 | hpa_t hpa; | |
77 | struct kvm_memory_slot *slot; | |
ac79c978 | 78 | pt_element_t *ptep; |
1b0973bd | 79 | pt_element_t root; |
cea0f0e7 | 80 | gfn_t table_gfn; |
6aa8b732 | 81 | |
cea0f0e7 | 82 | pgprintk("%s: addr %lx\n", __FUNCTION__, addr); |
6aa8b732 | 83 | walker->level = vcpu->mmu.root_level; |
1b0973bd AK |
84 | walker->table = NULL; |
85 | root = vcpu->cr3; | |
86 | #if PTTYPE == 64 | |
87 | if (!is_long_mode(vcpu)) { | |
88 | walker->ptep = &vcpu->pdptrs[(addr >> 30) & 3]; | |
89 | root = *walker->ptep; | |
90 | if (!(root & PT_PRESENT_MASK)) | |
7993ba43 | 91 | goto not_present; |
1b0973bd AK |
92 | --walker->level; |
93 | } | |
94 | #endif | |
cea0f0e7 AK |
95 | table_gfn = (root & PT64_BASE_ADDR_MASK) >> PAGE_SHIFT; |
96 | walker->table_gfn[walker->level - 1] = table_gfn; | |
97 | pgprintk("%s: table_gfn[%d] %lx\n", __FUNCTION__, | |
98 | walker->level - 1, table_gfn); | |
99 | slot = gfn_to_memslot(vcpu->kvm, table_gfn); | |
1b0973bd | 100 | hpa = safe_gpa_to_hpa(vcpu, root & PT64_BASE_ADDR_MASK); |
6aa8b732 AK |
101 | walker->table = kmap_atomic(pfn_to_page(hpa >> PAGE_SHIFT), KM_USER0); |
102 | ||
a9058ecd | 103 | ASSERT((!is_long_mode(vcpu) && is_pae(vcpu)) || |
6aa8b732 AK |
104 | (vcpu->cr3 & ~(PAGE_MASK | CR3_FLAGS_MASK)) == 0); |
105 | ||
6aa8b732 | 106 | walker->inherited_ar = PT_USER_MASK | PT_WRITABLE_MASK; |
ac79c978 AK |
107 | |
108 | for (;;) { | |
109 | int index = PT_INDEX(addr, walker->level); | |
110 | hpa_t paddr; | |
111 | ||
112 | ptep = &walker->table[index]; | |
113 | ASSERT(((unsigned long)walker->table & PAGE_MASK) == | |
114 | ((unsigned long)ptep & PAGE_MASK)); | |
115 | ||
815af8d4 | 116 | if (!is_present_pte(*ptep)) |
7993ba43 AK |
117 | goto not_present; |
118 | ||
119 | if (write_fault && !is_writeble_pte(*ptep)) | |
120 | if (user_fault || is_write_protection(vcpu)) | |
121 | goto access_error; | |
122 | ||
123 | if (user_fault && !(*ptep & PT_USER_MASK)) | |
124 | goto access_error; | |
125 | ||
73b1087e AK |
126 | #if PTTYPE == 64 |
127 | if (fetch_fault && is_nx(vcpu) && (*ptep & PT64_NX_MASK)) | |
128 | goto access_error; | |
129 | #endif | |
130 | ||
bf3f8e86 AK |
131 | if (!(*ptep & PT_ACCESSED_MASK)) { |
132 | mark_page_dirty(vcpu->kvm, table_gfn); | |
133 | *ptep |= PT_ACCESSED_MASK; | |
134 | } | |
815af8d4 AK |
135 | |
136 | if (walker->level == PT_PAGE_TABLE_LEVEL) { | |
137 | walker->gfn = (*ptep & PT_BASE_ADDR_MASK) | |
138 | >> PAGE_SHIFT; | |
139 | break; | |
140 | } | |
141 | ||
142 | if (walker->level == PT_DIRECTORY_LEVEL | |
143 | && (*ptep & PT_PAGE_SIZE_MASK) | |
144 | && (PTTYPE == 64 || is_pse(vcpu))) { | |
145 | walker->gfn = (*ptep & PT_DIR_BASE_ADDR_MASK) | |
146 | >> PAGE_SHIFT; | |
147 | walker->gfn += PT_INDEX(addr, PT_PAGE_TABLE_LEVEL); | |
ac79c978 | 148 | break; |
815af8d4 | 149 | } |
ac79c978 | 150 | |
ca5aac1f | 151 | walker->inherited_ar &= walker->table[index]; |
cea0f0e7 | 152 | table_gfn = (*ptep & PT_BASE_ADDR_MASK) >> PAGE_SHIFT; |
ac79c978 AK |
153 | paddr = safe_gpa_to_hpa(vcpu, *ptep & PT_BASE_ADDR_MASK); |
154 | kunmap_atomic(walker->table, KM_USER0); | |
155 | walker->table = kmap_atomic(pfn_to_page(paddr >> PAGE_SHIFT), | |
156 | KM_USER0); | |
157 | --walker->level; | |
cea0f0e7 AK |
158 | walker->table_gfn[walker->level - 1 ] = table_gfn; |
159 | pgprintk("%s: table_gfn[%d] %lx\n", __FUNCTION__, | |
160 | walker->level - 1, table_gfn); | |
ac79c978 AK |
161 | } |
162 | walker->ptep = ptep; | |
374cbac0 | 163 | pgprintk("%s: pte %llx\n", __FUNCTION__, (u64)*ptep); |
7993ba43 AK |
164 | return 1; |
165 | ||
166 | not_present: | |
167 | walker->error_code = 0; | |
168 | goto err; | |
169 | ||
170 | access_error: | |
171 | walker->error_code = PFERR_PRESENT_MASK; | |
172 | ||
173 | err: | |
174 | if (write_fault) | |
175 | walker->error_code |= PFERR_WRITE_MASK; | |
176 | if (user_fault) | |
177 | walker->error_code |= PFERR_USER_MASK; | |
73b1087e AK |
178 | if (fetch_fault) |
179 | walker->error_code |= PFERR_FETCH_MASK; | |
7993ba43 | 180 | return 0; |
6aa8b732 AK |
181 | } |
182 | ||
183 | static void FNAME(release_walker)(struct guest_walker *walker) | |
184 | { | |
1b0973bd AK |
185 | if (walker->table) |
186 | kunmap_atomic(walker->table, KM_USER0); | |
6aa8b732 AK |
187 | } |
188 | ||
bf3f8e86 AK |
189 | static void FNAME(mark_pagetable_dirty)(struct kvm *kvm, |
190 | struct guest_walker *walker) | |
191 | { | |
192 | mark_page_dirty(kvm, walker->table_gfn[walker->level - 1]); | |
193 | } | |
194 | ||
e60d75ea AK |
195 | static void FNAME(set_pte_common)(struct kvm_vcpu *vcpu, |
196 | u64 *shadow_pte, | |
197 | gpa_t gaddr, | |
6598c8b2 | 198 | pt_element_t *gpte, |
e60d75ea | 199 | u64 access_bits, |
97a0a01e | 200 | int user_fault, |
63b1ad24 | 201 | int write_fault, |
97a0a01e AK |
202 | int *ptwrite, |
203 | struct guest_walker *walker, | |
e60d75ea AK |
204 | gfn_t gfn) |
205 | { | |
206 | hpa_t paddr; | |
6598c8b2 | 207 | int dirty = *gpte & PT_DIRTY_MASK; |
97a0a01e AK |
208 | int was_rmapped = is_rmap_pte(*shadow_pte); |
209 | ||
210 | pgprintk("%s: spte %llx gpte %llx access %llx write_fault %d" | |
211 | " user_fault %d gfn %lx\n", | |
212 | __FUNCTION__, *shadow_pte, (u64)*gpte, access_bits, | |
213 | write_fault, user_fault, gfn); | |
214 | ||
215 | if (write_fault && !dirty) { | |
216 | *gpte |= PT_DIRTY_MASK; | |
217 | dirty = 1; | |
218 | FNAME(mark_pagetable_dirty)(vcpu->kvm, walker); | |
219 | } | |
e60d75ea | 220 | |
a18de5a4 | 221 | *shadow_pte |= *gpte & PT_PTE_COPY_MASK; |
e60d75ea AK |
222 | *shadow_pte |= access_bits << PT_SHADOW_BITS_OFFSET; |
223 | if (!dirty) | |
224 | access_bits &= ~PT_WRITABLE_MASK; | |
225 | ||
226 | paddr = gpa_to_hpa(vcpu, gaddr & PT64_BASE_ADDR_MASK); | |
227 | ||
97a0a01e AK |
228 | *shadow_pte |= PT_PRESENT_MASK; |
229 | if (access_bits & PT_USER_MASK) | |
230 | *shadow_pte |= PT_USER_MASK; | |
e60d75ea AK |
231 | |
232 | if (is_error_hpa(paddr)) { | |
233 | *shadow_pte |= gaddr; | |
234 | *shadow_pte |= PT_SHADOW_IO_MARK; | |
235 | *shadow_pte &= ~PT_PRESENT_MASK; | |
236 | return; | |
237 | } | |
238 | ||
239 | *shadow_pte |= paddr; | |
240 | ||
63b1ad24 AK |
241 | if (!write_fault && (*shadow_pte & PT_SHADOW_USER_MASK) && |
242 | !(*shadow_pte & PT_USER_MASK)) { | |
243 | /* | |
244 | * If supervisor write protect is disabled, we shadow kernel | |
245 | * pages as user pages so we can trap the write access. | |
246 | */ | |
247 | *shadow_pte |= PT_USER_MASK; | |
248 | *shadow_pte &= ~PT_WRITABLE_MASK; | |
249 | access_bits &= ~PT_WRITABLE_MASK; | |
250 | } | |
251 | ||
97a0a01e AK |
252 | if ((access_bits & PT_WRITABLE_MASK) |
253 | || (write_fault && !is_write_protection(vcpu) && !user_fault)) { | |
e60d75ea AK |
254 | struct kvm_mmu_page *shadow; |
255 | ||
97a0a01e AK |
256 | *shadow_pte |= PT_WRITABLE_MASK; |
257 | if (user_fault) { | |
258 | mmu_unshadow(vcpu, gfn); | |
259 | goto unshadowed; | |
260 | } | |
261 | ||
e60d75ea AK |
262 | shadow = kvm_mmu_lookup_page(vcpu, gfn); |
263 | if (shadow) { | |
264 | pgprintk("%s: found shadow page for %lx, marking ro\n", | |
265 | __FUNCTION__, gfn); | |
266 | access_bits &= ~PT_WRITABLE_MASK; | |
267 | if (is_writeble_pte(*shadow_pte)) { | |
97a0a01e AK |
268 | *shadow_pte &= ~PT_WRITABLE_MASK; |
269 | kvm_arch_ops->tlb_flush(vcpu); | |
e60d75ea | 270 | } |
97a0a01e AK |
271 | if (write_fault) |
272 | *ptwrite = 1; | |
e60d75ea AK |
273 | } |
274 | } | |
275 | ||
97a0a01e AK |
276 | unshadowed: |
277 | ||
e60d75ea AK |
278 | if (access_bits & PT_WRITABLE_MASK) |
279 | mark_page_dirty(vcpu->kvm, gaddr >> PAGE_SHIFT); | |
280 | ||
281 | page_header_update_slot(vcpu->kvm, shadow_pte, gaddr); | |
97a0a01e AK |
282 | if (!was_rmapped) |
283 | rmap_add(vcpu, shadow_pte); | |
e60d75ea AK |
284 | } |
285 | ||
6598c8b2 | 286 | static void FNAME(set_pte)(struct kvm_vcpu *vcpu, pt_element_t *gpte, |
63b1ad24 | 287 | u64 *shadow_pte, u64 access_bits, |
97a0a01e AK |
288 | int user_fault, int write_fault, int *ptwrite, |
289 | struct guest_walker *walker, gfn_t gfn) | |
6aa8b732 | 290 | { |
6598c8b2 | 291 | access_bits &= *gpte; |
6598c8b2 | 292 | FNAME(set_pte_common)(vcpu, shadow_pte, *gpte & PT_BASE_ADDR_MASK, |
97a0a01e AK |
293 | gpte, access_bits, user_fault, write_fault, |
294 | ptwrite, walker, gfn); | |
6aa8b732 AK |
295 | } |
296 | ||
0028425f AK |
297 | static void FNAME(update_pte)(struct kvm_vcpu *vcpu, struct kvm_mmu_page *page, |
298 | u64 *spte, const void *pte, int bytes) | |
299 | { | |
300 | pt_element_t gpte; | |
301 | ||
302 | if (bytes < sizeof(pt_element_t)) | |
303 | return; | |
304 | gpte = *(const pt_element_t *)pte; | |
305 | if (~gpte & (PT_PRESENT_MASK | PT_ACCESSED_MASK)) | |
306 | return; | |
307 | pgprintk("%s: gpte %llx spte %p\n", __FUNCTION__, (u64)gpte, spte); | |
63b1ad24 | 308 | FNAME(set_pte)(vcpu, &gpte, spte, PT_USER_MASK | PT_WRITABLE_MASK, 0, |
97a0a01e | 309 | 0, NULL, NULL, |
0028425f AK |
310 | (gpte & PT_BASE_ADDR_MASK) >> PAGE_SHIFT); |
311 | } | |
312 | ||
6598c8b2 | 313 | static void FNAME(set_pde)(struct kvm_vcpu *vcpu, pt_element_t *gpde, |
97a0a01e AK |
314 | u64 *shadow_pte, u64 access_bits, |
315 | int user_fault, int write_fault, int *ptwrite, | |
316 | struct guest_walker *walker, gfn_t gfn) | |
6aa8b732 AK |
317 | { |
318 | gpa_t gaddr; | |
319 | ||
6598c8b2 | 320 | access_bits &= *gpde; |
815af8d4 | 321 | gaddr = (gpa_t)gfn << PAGE_SHIFT; |
6aa8b732 | 322 | if (PTTYPE == 32 && is_cpuid_PSE36()) |
6598c8b2 | 323 | gaddr |= (*gpde & PT32_DIR_PSE36_MASK) << |
6aa8b732 | 324 | (32 - PT32_DIR_PSE36_SHIFT); |
e60d75ea | 325 | FNAME(set_pte_common)(vcpu, shadow_pte, gaddr, |
97a0a01e AK |
326 | gpde, access_bits, user_fault, write_fault, |
327 | ptwrite, walker, gfn); | |
6aa8b732 AK |
328 | } |
329 | ||
6aa8b732 AK |
330 | /* |
331 | * Fetch a shadow pte for a specific level in the paging hierarchy. | |
332 | */ | |
333 | static u64 *FNAME(fetch)(struct kvm_vcpu *vcpu, gva_t addr, | |
97a0a01e AK |
334 | struct guest_walker *walker, |
335 | int user_fault, int write_fault, int *ptwrite) | |
6aa8b732 AK |
336 | { |
337 | hpa_t shadow_addr; | |
338 | int level; | |
ef0197e8 | 339 | u64 *shadow_ent; |
6aa8b732 | 340 | u64 *prev_shadow_ent = NULL; |
ac79c978 AK |
341 | pt_element_t *guest_ent = walker->ptep; |
342 | ||
343 | if (!is_present_pte(*guest_ent)) | |
344 | return NULL; | |
6aa8b732 AK |
345 | |
346 | shadow_addr = vcpu->mmu.root_hpa; | |
347 | level = vcpu->mmu.shadow_root_level; | |
aef3d3fe AK |
348 | if (level == PT32E_ROOT_LEVEL) { |
349 | shadow_addr = vcpu->mmu.pae_root[(addr >> 30) & 3]; | |
350 | shadow_addr &= PT64_BASE_ADDR_MASK; | |
351 | --level; | |
352 | } | |
6aa8b732 AK |
353 | |
354 | for (; ; level--) { | |
355 | u32 index = SHADOW_PT_INDEX(addr, level); | |
25c0de2c | 356 | struct kvm_mmu_page *shadow_page; |
8c7bb723 | 357 | u64 shadow_pte; |
cea0f0e7 AK |
358 | int metaphysical; |
359 | gfn_t table_gfn; | |
d28c6cfb | 360 | unsigned hugepage_access = 0; |
6aa8b732 | 361 | |
ef0197e8 | 362 | shadow_ent = ((u64 *)__va(shadow_addr)) + index; |
6aa8b732 AK |
363 | if (is_present_pte(*shadow_ent) || is_io_pte(*shadow_ent)) { |
364 | if (level == PT_PAGE_TABLE_LEVEL) | |
97a0a01e | 365 | break; |
6aa8b732 AK |
366 | shadow_addr = *shadow_ent & PT64_BASE_ADDR_MASK; |
367 | prev_shadow_ent = shadow_ent; | |
368 | continue; | |
369 | } | |
370 | ||
ef0197e8 AK |
371 | if (level == PT_PAGE_TABLE_LEVEL) |
372 | break; | |
6aa8b732 | 373 | |
cea0f0e7 AK |
374 | if (level - 1 == PT_PAGE_TABLE_LEVEL |
375 | && walker->level == PT_DIRECTORY_LEVEL) { | |
376 | metaphysical = 1; | |
d28c6cfb AK |
377 | hugepage_access = *guest_ent; |
378 | hugepage_access &= PT_USER_MASK | PT_WRITABLE_MASK; | |
379 | hugepage_access >>= PT_WRITABLE_SHIFT; | |
cea0f0e7 AK |
380 | table_gfn = (*guest_ent & PT_BASE_ADDR_MASK) |
381 | >> PAGE_SHIFT; | |
382 | } else { | |
383 | metaphysical = 0; | |
384 | table_gfn = walker->table_gfn[level - 2]; | |
385 | } | |
386 | shadow_page = kvm_mmu_get_page(vcpu, table_gfn, addr, level-1, | |
d28c6cfb AK |
387 | metaphysical, hugepage_access, |
388 | shadow_ent); | |
47ad8e68 | 389 | shadow_addr = __pa(shadow_page->spt); |
aef3d3fe AK |
390 | shadow_pte = shadow_addr | PT_PRESENT_MASK | PT_ACCESSED_MASK |
391 | | PT_WRITABLE_MASK | PT_USER_MASK; | |
8c7bb723 | 392 | *shadow_ent = shadow_pte; |
6aa8b732 AK |
393 | prev_shadow_ent = shadow_ent; |
394 | } | |
ef0197e8 AK |
395 | |
396 | if (walker->level == PT_DIRECTORY_LEVEL) { | |
397 | if (prev_shadow_ent) | |
398 | *prev_shadow_ent |= PT_SHADOW_PS_MARK; | |
6598c8b2 | 399 | FNAME(set_pde)(vcpu, guest_ent, shadow_ent, |
97a0a01e AK |
400 | walker->inherited_ar, user_fault, write_fault, |
401 | ptwrite, walker, walker->gfn); | |
ef0197e8 AK |
402 | } else { |
403 | ASSERT(walker->level == PT_PAGE_TABLE_LEVEL); | |
6598c8b2 | 404 | FNAME(set_pte)(vcpu, guest_ent, shadow_ent, |
97a0a01e AK |
405 | walker->inherited_ar, user_fault, write_fault, |
406 | ptwrite, walker, walker->gfn); | |
ef0197e8 AK |
407 | } |
408 | return shadow_ent; | |
6aa8b732 AK |
409 | } |
410 | ||
6aa8b732 AK |
411 | /* |
412 | * Page fault handler. There are several causes for a page fault: | |
413 | * - there is no shadow pte for the guest pte | |
414 | * - write access through a shadow pte marked read only so that we can set | |
415 | * the dirty bit | |
416 | * - write access to a shadow pte marked read only so we can update the page | |
417 | * dirty bitmap, when userspace requests it | |
418 | * - mmio access; in this case we will never install a present shadow pte | |
419 | * - normal guest page fault due to the guest pte marked not present, not | |
420 | * writable, or not executable | |
421 | * | |
e2dec939 AK |
422 | * Returns: 1 if we need to emulate the instruction, 0 otherwise, or |
423 | * a negative value on error. | |
6aa8b732 AK |
424 | */ |
425 | static int FNAME(page_fault)(struct kvm_vcpu *vcpu, gva_t addr, | |
426 | u32 error_code) | |
427 | { | |
428 | int write_fault = error_code & PFERR_WRITE_MASK; | |
6aa8b732 | 429 | int user_fault = error_code & PFERR_USER_MASK; |
73b1087e | 430 | int fetch_fault = error_code & PFERR_FETCH_MASK; |
6aa8b732 AK |
431 | struct guest_walker walker; |
432 | u64 *shadow_pte; | |
cea0f0e7 | 433 | int write_pt = 0; |
e2dec939 | 434 | int r; |
6aa8b732 | 435 | |
cea0f0e7 | 436 | pgprintk("%s: addr %lx err %x\n", __FUNCTION__, addr, error_code); |
37a7d8b0 | 437 | kvm_mmu_audit(vcpu, "pre page fault"); |
714b93da | 438 | |
e2dec939 AK |
439 | r = mmu_topup_memory_caches(vcpu); |
440 | if (r) | |
441 | return r; | |
714b93da | 442 | |
6aa8b732 AK |
443 | /* |
444 | * Look up the shadow pte for the faulting address. | |
445 | */ | |
73b1087e AK |
446 | r = FNAME(walk_addr)(&walker, vcpu, addr, write_fault, user_fault, |
447 | fetch_fault); | |
6aa8b732 AK |
448 | |
449 | /* | |
450 | * The page is not mapped by the guest. Let the guest handle it. | |
451 | */ | |
7993ba43 AK |
452 | if (!r) { |
453 | pgprintk("%s: guest page fault\n", __FUNCTION__); | |
454 | inject_page_fault(vcpu, addr, walker.error_code); | |
6aa8b732 | 455 | FNAME(release_walker)(&walker); |
a25f7e1f | 456 | vcpu->last_pt_write_count = 0; /* reset fork detector */ |
6aa8b732 AK |
457 | return 0; |
458 | } | |
459 | ||
97a0a01e AK |
460 | shadow_pte = FNAME(fetch)(vcpu, addr, &walker, user_fault, write_fault, |
461 | &write_pt); | |
462 | pgprintk("%s: shadow pte %p %llx ptwrite %d\n", __FUNCTION__, | |
463 | shadow_pte, *shadow_pte, write_pt); | |
cea0f0e7 | 464 | |
6aa8b732 AK |
465 | FNAME(release_walker)(&walker); |
466 | ||
a25f7e1f AK |
467 | if (!write_pt) |
468 | vcpu->last_pt_write_count = 0; /* reset fork detector */ | |
469 | ||
6aa8b732 AK |
470 | /* |
471 | * mmio: emulate if accessible, otherwise its a guest fault. | |
472 | */ | |
d27d4aca | 473 | if (is_io_pte(*shadow_pte)) |
7993ba43 | 474 | return 1; |
6aa8b732 | 475 | |
1165f5fe | 476 | ++vcpu->stat.pf_fixed; |
37a7d8b0 | 477 | kvm_mmu_audit(vcpu, "post page fault (fixed)"); |
6aa8b732 | 478 | |
cea0f0e7 | 479 | return write_pt; |
6aa8b732 AK |
480 | } |
481 | ||
482 | static gpa_t FNAME(gva_to_gpa)(struct kvm_vcpu *vcpu, gva_t vaddr) | |
483 | { | |
484 | struct guest_walker walker; | |
e119d117 AK |
485 | gpa_t gpa = UNMAPPED_GVA; |
486 | int r; | |
6aa8b732 | 487 | |
e119d117 | 488 | r = FNAME(walk_addr)(&walker, vcpu, vaddr, 0, 0, 0); |
6aa8b732 | 489 | |
e119d117 AK |
490 | if (r) { |
491 | gpa = (gpa_t)walker.gfn << PAGE_SHIFT; | |
492 | gpa |= vaddr & ~PAGE_MASK; | |
6aa8b732 AK |
493 | } |
494 | ||
e119d117 | 495 | FNAME(release_walker)(&walker); |
6aa8b732 AK |
496 | return gpa; |
497 | } | |
498 | ||
499 | #undef pt_element_t | |
500 | #undef guest_walker | |
501 | #undef FNAME | |
502 | #undef PT_BASE_ADDR_MASK | |
503 | #undef PT_INDEX | |
504 | #undef SHADOW_PT_INDEX | |
505 | #undef PT_LEVEL_MASK | |
506 | #undef PT_PTE_COPY_MASK | |
507 | #undef PT_NON_PTE_COPY_MASK | |
508 | #undef PT_DIR_BASE_ADDR_MASK | |
cea0f0e7 | 509 | #undef PT_MAX_FULL_LEVELS |