Commit | Line | Data |
---|---|---|
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 | 19 | |
1d737c8a | 20 | #include "mmu.h" |
e495606d | 21 | |
edf88417 | 22 | #include <linux/kvm_host.h> |
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> | |
448353ca | 28 | #include <linux/swap.h> |
05da4558 | 29 | #include <linux/hugetlb.h> |
2f333bcb | 30 | #include <linux/compiler.h> |
6aa8b732 | 31 | |
e495606d AK |
32 | #include <asm/page.h> |
33 | #include <asm/cmpxchg.h> | |
4e542370 | 34 | #include <asm/io.h> |
13673a90 | 35 | #include <asm/vmx.h> |
6aa8b732 | 36 | |
18552672 JR |
37 | /* |
38 | * When setting this variable to true it enables Two-Dimensional-Paging | |
39 | * where the hardware walks 2 page tables: | |
40 | * 1. the guest-virtual to guest-physical | |
41 | * 2. while doing 1. it walks guest-physical to host-physical | |
42 | * If the hardware supports that we don't need to do shadow paging. | |
43 | */ | |
2f333bcb | 44 | bool tdp_enabled = false; |
18552672 | 45 | |
37a7d8b0 AK |
46 | #undef MMU_DEBUG |
47 | ||
48 | #undef AUDIT | |
49 | ||
50 | #ifdef AUDIT | |
51 | static void kvm_mmu_audit(struct kvm_vcpu *vcpu, const char *msg); | |
52 | #else | |
53 | static void kvm_mmu_audit(struct kvm_vcpu *vcpu, const char *msg) {} | |
54 | #endif | |
55 | ||
56 | #ifdef MMU_DEBUG | |
57 | ||
58 | #define pgprintk(x...) do { if (dbg) printk(x); } while (0) | |
59 | #define rmap_printk(x...) do { if (dbg) printk(x); } while (0) | |
60 | ||
61 | #else | |
62 | ||
63 | #define pgprintk(x...) do { } while (0) | |
64 | #define rmap_printk(x...) do { } while (0) | |
65 | ||
66 | #endif | |
67 | ||
68 | #if defined(MMU_DEBUG) || defined(AUDIT) | |
6ada8cca AK |
69 | static int dbg = 0; |
70 | module_param(dbg, bool, 0644); | |
37a7d8b0 | 71 | #endif |
6aa8b732 | 72 | |
582801a9 MT |
73 | static int oos_shadow = 1; |
74 | module_param(oos_shadow, bool, 0644); | |
75 | ||
d6c69ee9 YD |
76 | #ifndef MMU_DEBUG |
77 | #define ASSERT(x) do { } while (0) | |
78 | #else | |
6aa8b732 AK |
79 | #define ASSERT(x) \ |
80 | if (!(x)) { \ | |
81 | printk(KERN_WARNING "assertion failed %s:%d: %s\n", \ | |
82 | __FILE__, __LINE__, #x); \ | |
83 | } | |
d6c69ee9 | 84 | #endif |
6aa8b732 | 85 | |
6aa8b732 AK |
86 | #define PT_FIRST_AVAIL_BITS_SHIFT 9 |
87 | #define PT64_SECOND_AVAIL_BITS_SHIFT 52 | |
88 | ||
6aa8b732 AK |
89 | #define VALID_PAGE(x) ((x) != INVALID_PAGE) |
90 | ||
91 | #define PT64_LEVEL_BITS 9 | |
92 | ||
93 | #define PT64_LEVEL_SHIFT(level) \ | |
d77c26fc | 94 | (PAGE_SHIFT + (level - 1) * PT64_LEVEL_BITS) |
6aa8b732 AK |
95 | |
96 | #define PT64_LEVEL_MASK(level) \ | |
97 | (((1ULL << PT64_LEVEL_BITS) - 1) << PT64_LEVEL_SHIFT(level)) | |
98 | ||
99 | #define PT64_INDEX(address, level)\ | |
100 | (((address) >> PT64_LEVEL_SHIFT(level)) & ((1 << PT64_LEVEL_BITS) - 1)) | |
101 | ||
102 | ||
103 | #define PT32_LEVEL_BITS 10 | |
104 | ||
105 | #define PT32_LEVEL_SHIFT(level) \ | |
d77c26fc | 106 | (PAGE_SHIFT + (level - 1) * PT32_LEVEL_BITS) |
6aa8b732 AK |
107 | |
108 | #define PT32_LEVEL_MASK(level) \ | |
109 | (((1ULL << PT32_LEVEL_BITS) - 1) << PT32_LEVEL_SHIFT(level)) | |
110 | ||
111 | #define PT32_INDEX(address, level)\ | |
112 | (((address) >> PT32_LEVEL_SHIFT(level)) & ((1 << PT32_LEVEL_BITS) - 1)) | |
113 | ||
114 | ||
27aba766 | 115 | #define PT64_BASE_ADDR_MASK (((1ULL << 52) - 1) & ~(u64)(PAGE_SIZE-1)) |
6aa8b732 AK |
116 | #define PT64_DIR_BASE_ADDR_MASK \ |
117 | (PT64_BASE_ADDR_MASK & ~((1ULL << (PAGE_SHIFT + PT64_LEVEL_BITS)) - 1)) | |
118 | ||
119 | #define PT32_BASE_ADDR_MASK PAGE_MASK | |
120 | #define PT32_DIR_BASE_ADDR_MASK \ | |
121 | (PAGE_MASK & ~((1ULL << (PAGE_SHIFT + PT32_LEVEL_BITS)) - 1)) | |
122 | ||
79539cec AK |
123 | #define PT64_PERM_MASK (PT_PRESENT_MASK | PT_WRITABLE_MASK | PT_USER_MASK \ |
124 | | PT64_NX_MASK) | |
6aa8b732 AK |
125 | |
126 | #define PFERR_PRESENT_MASK (1U << 0) | |
127 | #define PFERR_WRITE_MASK (1U << 1) | |
128 | #define PFERR_USER_MASK (1U << 2) | |
73b1087e | 129 | #define PFERR_FETCH_MASK (1U << 4) |
6aa8b732 | 130 | |
6aa8b732 AK |
131 | #define PT_DIRECTORY_LEVEL 2 |
132 | #define PT_PAGE_TABLE_LEVEL 1 | |
133 | ||
cd4a4e53 AK |
134 | #define RMAP_EXT 4 |
135 | ||
fe135d2c AK |
136 | #define ACC_EXEC_MASK 1 |
137 | #define ACC_WRITE_MASK PT_WRITABLE_MASK | |
138 | #define ACC_USER_MASK PT_USER_MASK | |
139 | #define ACC_ALL (ACC_EXEC_MASK | ACC_WRITE_MASK | ACC_USER_MASK) | |
140 | ||
135f8c2b AK |
141 | #define SHADOW_PT_INDEX(addr, level) PT64_INDEX(addr, level) |
142 | ||
cd4a4e53 AK |
143 | struct kvm_rmap_desc { |
144 | u64 *shadow_ptes[RMAP_EXT]; | |
145 | struct kvm_rmap_desc *more; | |
146 | }; | |
147 | ||
3d000db5 AK |
148 | struct kvm_shadow_walk { |
149 | int (*entry)(struct kvm_shadow_walk *walk, struct kvm_vcpu *vcpu, | |
d40a1ee4 | 150 | u64 addr, u64 *spte, int level); |
3d000db5 AK |
151 | }; |
152 | ||
4731d4c7 MT |
153 | struct kvm_unsync_walk { |
154 | int (*entry) (struct kvm_mmu_page *sp, struct kvm_unsync_walk *walk); | |
155 | }; | |
156 | ||
ad8cfbe3 MT |
157 | typedef int (*mmu_parent_walk_fn) (struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp); |
158 | ||
b5a33a75 AK |
159 | static struct kmem_cache *pte_chain_cache; |
160 | static struct kmem_cache *rmap_desc_cache; | |
d3d25b04 | 161 | static struct kmem_cache *mmu_page_header_cache; |
b5a33a75 | 162 | |
c7addb90 AK |
163 | static u64 __read_mostly shadow_trap_nonpresent_pte; |
164 | static u64 __read_mostly shadow_notrap_nonpresent_pte; | |
7b52345e SY |
165 | static u64 __read_mostly shadow_base_present_pte; |
166 | static u64 __read_mostly shadow_nx_mask; | |
167 | static u64 __read_mostly shadow_x_mask; /* mutual exclusive with nx_mask */ | |
168 | static u64 __read_mostly shadow_user_mask; | |
169 | static u64 __read_mostly shadow_accessed_mask; | |
170 | static u64 __read_mostly shadow_dirty_mask; | |
64d4d521 | 171 | static u64 __read_mostly shadow_mt_mask; |
c7addb90 AK |
172 | |
173 | void kvm_mmu_set_nonpresent_ptes(u64 trap_pte, u64 notrap_pte) | |
174 | { | |
175 | shadow_trap_nonpresent_pte = trap_pte; | |
176 | shadow_notrap_nonpresent_pte = notrap_pte; | |
177 | } | |
178 | EXPORT_SYMBOL_GPL(kvm_mmu_set_nonpresent_ptes); | |
179 | ||
7b52345e SY |
180 | void kvm_mmu_set_base_ptes(u64 base_pte) |
181 | { | |
182 | shadow_base_present_pte = base_pte; | |
183 | } | |
184 | EXPORT_SYMBOL_GPL(kvm_mmu_set_base_ptes); | |
185 | ||
186 | void kvm_mmu_set_mask_ptes(u64 user_mask, u64 accessed_mask, | |
64d4d521 | 187 | u64 dirty_mask, u64 nx_mask, u64 x_mask, u64 mt_mask) |
7b52345e SY |
188 | { |
189 | shadow_user_mask = user_mask; | |
190 | shadow_accessed_mask = accessed_mask; | |
191 | shadow_dirty_mask = dirty_mask; | |
192 | shadow_nx_mask = nx_mask; | |
193 | shadow_x_mask = x_mask; | |
64d4d521 | 194 | shadow_mt_mask = mt_mask; |
7b52345e SY |
195 | } |
196 | EXPORT_SYMBOL_GPL(kvm_mmu_set_mask_ptes); | |
197 | ||
6aa8b732 AK |
198 | static int is_write_protection(struct kvm_vcpu *vcpu) |
199 | { | |
ad312c7c | 200 | return vcpu->arch.cr0 & X86_CR0_WP; |
6aa8b732 AK |
201 | } |
202 | ||
203 | static int is_cpuid_PSE36(void) | |
204 | { | |
205 | return 1; | |
206 | } | |
207 | ||
73b1087e AK |
208 | static int is_nx(struct kvm_vcpu *vcpu) |
209 | { | |
ad312c7c | 210 | return vcpu->arch.shadow_efer & EFER_NX; |
73b1087e AK |
211 | } |
212 | ||
6aa8b732 AK |
213 | static int is_present_pte(unsigned long pte) |
214 | { | |
215 | return pte & PT_PRESENT_MASK; | |
216 | } | |
217 | ||
c7addb90 AK |
218 | static int is_shadow_present_pte(u64 pte) |
219 | { | |
c7addb90 AK |
220 | return pte != shadow_trap_nonpresent_pte |
221 | && pte != shadow_notrap_nonpresent_pte; | |
222 | } | |
223 | ||
05da4558 MT |
224 | static int is_large_pte(u64 pte) |
225 | { | |
226 | return pte & PT_PAGE_SIZE_MASK; | |
227 | } | |
228 | ||
6aa8b732 AK |
229 | static int is_writeble_pte(unsigned long pte) |
230 | { | |
231 | return pte & PT_WRITABLE_MASK; | |
232 | } | |
233 | ||
e3c5e7ec AK |
234 | static int is_dirty_pte(unsigned long pte) |
235 | { | |
7b52345e | 236 | return pte & shadow_dirty_mask; |
e3c5e7ec AK |
237 | } |
238 | ||
cd4a4e53 AK |
239 | static int is_rmap_pte(u64 pte) |
240 | { | |
4b1a80fa | 241 | return is_shadow_present_pte(pte); |
cd4a4e53 AK |
242 | } |
243 | ||
35149e21 | 244 | static pfn_t spte_to_pfn(u64 pte) |
0b49ea86 | 245 | { |
35149e21 | 246 | return (pte & PT64_BASE_ADDR_MASK) >> PAGE_SHIFT; |
0b49ea86 AK |
247 | } |
248 | ||
da928521 AK |
249 | static gfn_t pse36_gfn_delta(u32 gpte) |
250 | { | |
251 | int shift = 32 - PT32_DIR_PSE36_SHIFT - PAGE_SHIFT; | |
252 | ||
253 | return (gpte & PT32_DIR_PSE36_MASK) << shift; | |
254 | } | |
255 | ||
e663ee64 AK |
256 | static void set_shadow_pte(u64 *sptep, u64 spte) |
257 | { | |
258 | #ifdef CONFIG_X86_64 | |
259 | set_64bit((unsigned long *)sptep, spte); | |
260 | #else | |
261 | set_64bit((unsigned long long *)sptep, spte); | |
262 | #endif | |
263 | } | |
264 | ||
e2dec939 | 265 | static int mmu_topup_memory_cache(struct kvm_mmu_memory_cache *cache, |
2e3e5882 | 266 | struct kmem_cache *base_cache, int min) |
714b93da AK |
267 | { |
268 | void *obj; | |
269 | ||
270 | if (cache->nobjs >= min) | |
e2dec939 | 271 | return 0; |
714b93da | 272 | while (cache->nobjs < ARRAY_SIZE(cache->objects)) { |
2e3e5882 | 273 | obj = kmem_cache_zalloc(base_cache, GFP_KERNEL); |
714b93da | 274 | if (!obj) |
e2dec939 | 275 | return -ENOMEM; |
714b93da AK |
276 | cache->objects[cache->nobjs++] = obj; |
277 | } | |
e2dec939 | 278 | return 0; |
714b93da AK |
279 | } |
280 | ||
281 | static void mmu_free_memory_cache(struct kvm_mmu_memory_cache *mc) | |
282 | { | |
283 | while (mc->nobjs) | |
284 | kfree(mc->objects[--mc->nobjs]); | |
285 | } | |
286 | ||
c1158e63 | 287 | static int mmu_topup_memory_cache_page(struct kvm_mmu_memory_cache *cache, |
2e3e5882 | 288 | int min) |
c1158e63 AK |
289 | { |
290 | struct page *page; | |
291 | ||
292 | if (cache->nobjs >= min) | |
293 | return 0; | |
294 | while (cache->nobjs < ARRAY_SIZE(cache->objects)) { | |
2e3e5882 | 295 | page = alloc_page(GFP_KERNEL); |
c1158e63 AK |
296 | if (!page) |
297 | return -ENOMEM; | |
298 | set_page_private(page, 0); | |
299 | cache->objects[cache->nobjs++] = page_address(page); | |
300 | } | |
301 | return 0; | |
302 | } | |
303 | ||
304 | static void mmu_free_memory_cache_page(struct kvm_mmu_memory_cache *mc) | |
305 | { | |
306 | while (mc->nobjs) | |
c4d198d5 | 307 | free_page((unsigned long)mc->objects[--mc->nobjs]); |
c1158e63 AK |
308 | } |
309 | ||
2e3e5882 | 310 | static int mmu_topup_memory_caches(struct kvm_vcpu *vcpu) |
714b93da | 311 | { |
e2dec939 AK |
312 | int r; |
313 | ||
ad312c7c | 314 | r = mmu_topup_memory_cache(&vcpu->arch.mmu_pte_chain_cache, |
2e3e5882 | 315 | pte_chain_cache, 4); |
e2dec939 AK |
316 | if (r) |
317 | goto out; | |
ad312c7c | 318 | r = mmu_topup_memory_cache(&vcpu->arch.mmu_rmap_desc_cache, |
c41ef344 | 319 | rmap_desc_cache, 4); |
d3d25b04 AK |
320 | if (r) |
321 | goto out; | |
ad312c7c | 322 | r = mmu_topup_memory_cache_page(&vcpu->arch.mmu_page_cache, 8); |
d3d25b04 AK |
323 | if (r) |
324 | goto out; | |
ad312c7c | 325 | r = mmu_topup_memory_cache(&vcpu->arch.mmu_page_header_cache, |
2e3e5882 | 326 | mmu_page_header_cache, 4); |
e2dec939 AK |
327 | out: |
328 | return r; | |
714b93da AK |
329 | } |
330 | ||
331 | static void mmu_free_memory_caches(struct kvm_vcpu *vcpu) | |
332 | { | |
ad312c7c ZX |
333 | mmu_free_memory_cache(&vcpu->arch.mmu_pte_chain_cache); |
334 | mmu_free_memory_cache(&vcpu->arch.mmu_rmap_desc_cache); | |
335 | mmu_free_memory_cache_page(&vcpu->arch.mmu_page_cache); | |
336 | mmu_free_memory_cache(&vcpu->arch.mmu_page_header_cache); | |
714b93da AK |
337 | } |
338 | ||
339 | static void *mmu_memory_cache_alloc(struct kvm_mmu_memory_cache *mc, | |
340 | size_t size) | |
341 | { | |
342 | void *p; | |
343 | ||
344 | BUG_ON(!mc->nobjs); | |
345 | p = mc->objects[--mc->nobjs]; | |
346 | memset(p, 0, size); | |
347 | return p; | |
348 | } | |
349 | ||
714b93da AK |
350 | static struct kvm_pte_chain *mmu_alloc_pte_chain(struct kvm_vcpu *vcpu) |
351 | { | |
ad312c7c | 352 | return mmu_memory_cache_alloc(&vcpu->arch.mmu_pte_chain_cache, |
714b93da AK |
353 | sizeof(struct kvm_pte_chain)); |
354 | } | |
355 | ||
90cb0529 | 356 | static void mmu_free_pte_chain(struct kvm_pte_chain *pc) |
714b93da | 357 | { |
90cb0529 | 358 | kfree(pc); |
714b93da AK |
359 | } |
360 | ||
361 | static struct kvm_rmap_desc *mmu_alloc_rmap_desc(struct kvm_vcpu *vcpu) | |
362 | { | |
ad312c7c | 363 | return mmu_memory_cache_alloc(&vcpu->arch.mmu_rmap_desc_cache, |
714b93da AK |
364 | sizeof(struct kvm_rmap_desc)); |
365 | } | |
366 | ||
90cb0529 | 367 | static void mmu_free_rmap_desc(struct kvm_rmap_desc *rd) |
714b93da | 368 | { |
90cb0529 | 369 | kfree(rd); |
714b93da AK |
370 | } |
371 | ||
05da4558 MT |
372 | /* |
373 | * Return the pointer to the largepage write count for a given | |
374 | * gfn, handling slots that are not large page aligned. | |
375 | */ | |
376 | static int *slot_largepage_idx(gfn_t gfn, struct kvm_memory_slot *slot) | |
377 | { | |
378 | unsigned long idx; | |
379 | ||
380 | idx = (gfn / KVM_PAGES_PER_HPAGE) - | |
381 | (slot->base_gfn / KVM_PAGES_PER_HPAGE); | |
382 | return &slot->lpage_info[idx].write_count; | |
383 | } | |
384 | ||
385 | static void account_shadowed(struct kvm *kvm, gfn_t gfn) | |
386 | { | |
387 | int *write_count; | |
388 | ||
2843099f IE |
389 | gfn = unalias_gfn(kvm, gfn); |
390 | write_count = slot_largepage_idx(gfn, | |
391 | gfn_to_memslot_unaliased(kvm, gfn)); | |
05da4558 | 392 | *write_count += 1; |
05da4558 MT |
393 | } |
394 | ||
395 | static void unaccount_shadowed(struct kvm *kvm, gfn_t gfn) | |
396 | { | |
397 | int *write_count; | |
398 | ||
2843099f IE |
399 | gfn = unalias_gfn(kvm, gfn); |
400 | write_count = slot_largepage_idx(gfn, | |
401 | gfn_to_memslot_unaliased(kvm, gfn)); | |
05da4558 MT |
402 | *write_count -= 1; |
403 | WARN_ON(*write_count < 0); | |
404 | } | |
405 | ||
406 | static int has_wrprotected_page(struct kvm *kvm, gfn_t gfn) | |
407 | { | |
2843099f | 408 | struct kvm_memory_slot *slot; |
05da4558 MT |
409 | int *largepage_idx; |
410 | ||
2843099f IE |
411 | gfn = unalias_gfn(kvm, gfn); |
412 | slot = gfn_to_memslot_unaliased(kvm, gfn); | |
05da4558 MT |
413 | if (slot) { |
414 | largepage_idx = slot_largepage_idx(gfn, slot); | |
415 | return *largepage_idx; | |
416 | } | |
417 | ||
418 | return 1; | |
419 | } | |
420 | ||
421 | static int host_largepage_backed(struct kvm *kvm, gfn_t gfn) | |
422 | { | |
423 | struct vm_area_struct *vma; | |
424 | unsigned long addr; | |
4c2155ce | 425 | int ret = 0; |
05da4558 MT |
426 | |
427 | addr = gfn_to_hva(kvm, gfn); | |
428 | if (kvm_is_error_hva(addr)) | |
4c2155ce | 429 | return ret; |
05da4558 | 430 | |
4c2155ce | 431 | down_read(¤t->mm->mmap_sem); |
05da4558 MT |
432 | vma = find_vma(current->mm, addr); |
433 | if (vma && is_vm_hugetlb_page(vma)) | |
4c2155ce MT |
434 | ret = 1; |
435 | up_read(¤t->mm->mmap_sem); | |
05da4558 | 436 | |
4c2155ce | 437 | return ret; |
05da4558 MT |
438 | } |
439 | ||
440 | static int is_largepage_backed(struct kvm_vcpu *vcpu, gfn_t large_gfn) | |
441 | { | |
442 | struct kvm_memory_slot *slot; | |
443 | ||
444 | if (has_wrprotected_page(vcpu->kvm, large_gfn)) | |
445 | return 0; | |
446 | ||
447 | if (!host_largepage_backed(vcpu->kvm, large_gfn)) | |
448 | return 0; | |
449 | ||
450 | slot = gfn_to_memslot(vcpu->kvm, large_gfn); | |
451 | if (slot && slot->dirty_bitmap) | |
452 | return 0; | |
453 | ||
454 | return 1; | |
455 | } | |
456 | ||
290fc38d IE |
457 | /* |
458 | * Take gfn and return the reverse mapping to it. | |
459 | * Note: gfn must be unaliased before this function get called | |
460 | */ | |
461 | ||
05da4558 | 462 | static unsigned long *gfn_to_rmap(struct kvm *kvm, gfn_t gfn, int lpage) |
290fc38d IE |
463 | { |
464 | struct kvm_memory_slot *slot; | |
05da4558 | 465 | unsigned long idx; |
290fc38d IE |
466 | |
467 | slot = gfn_to_memslot(kvm, gfn); | |
05da4558 MT |
468 | if (!lpage) |
469 | return &slot->rmap[gfn - slot->base_gfn]; | |
470 | ||
471 | idx = (gfn / KVM_PAGES_PER_HPAGE) - | |
472 | (slot->base_gfn / KVM_PAGES_PER_HPAGE); | |
473 | ||
474 | return &slot->lpage_info[idx].rmap_pde; | |
290fc38d IE |
475 | } |
476 | ||
cd4a4e53 AK |
477 | /* |
478 | * Reverse mapping data structures: | |
479 | * | |
290fc38d IE |
480 | * If rmapp bit zero is zero, then rmapp point to the shadw page table entry |
481 | * that points to page_address(page). | |
cd4a4e53 | 482 | * |
290fc38d IE |
483 | * If rmapp bit zero is one, (then rmap & ~1) points to a struct kvm_rmap_desc |
484 | * containing more mappings. | |
cd4a4e53 | 485 | */ |
05da4558 | 486 | static void rmap_add(struct kvm_vcpu *vcpu, u64 *spte, gfn_t gfn, int lpage) |
cd4a4e53 | 487 | { |
4db35314 | 488 | struct kvm_mmu_page *sp; |
cd4a4e53 | 489 | struct kvm_rmap_desc *desc; |
290fc38d | 490 | unsigned long *rmapp; |
cd4a4e53 AK |
491 | int i; |
492 | ||
493 | if (!is_rmap_pte(*spte)) | |
494 | return; | |
290fc38d | 495 | gfn = unalias_gfn(vcpu->kvm, gfn); |
4db35314 AK |
496 | sp = page_header(__pa(spte)); |
497 | sp->gfns[spte - sp->spt] = gfn; | |
05da4558 | 498 | rmapp = gfn_to_rmap(vcpu->kvm, gfn, lpage); |
290fc38d | 499 | if (!*rmapp) { |
cd4a4e53 | 500 | rmap_printk("rmap_add: %p %llx 0->1\n", spte, *spte); |
290fc38d IE |
501 | *rmapp = (unsigned long)spte; |
502 | } else if (!(*rmapp & 1)) { | |
cd4a4e53 | 503 | rmap_printk("rmap_add: %p %llx 1->many\n", spte, *spte); |
714b93da | 504 | desc = mmu_alloc_rmap_desc(vcpu); |
290fc38d | 505 | desc->shadow_ptes[0] = (u64 *)*rmapp; |
cd4a4e53 | 506 | desc->shadow_ptes[1] = spte; |
290fc38d | 507 | *rmapp = (unsigned long)desc | 1; |
cd4a4e53 AK |
508 | } else { |
509 | rmap_printk("rmap_add: %p %llx many->many\n", spte, *spte); | |
290fc38d | 510 | desc = (struct kvm_rmap_desc *)(*rmapp & ~1ul); |
cd4a4e53 AK |
511 | while (desc->shadow_ptes[RMAP_EXT-1] && desc->more) |
512 | desc = desc->more; | |
513 | if (desc->shadow_ptes[RMAP_EXT-1]) { | |
714b93da | 514 | desc->more = mmu_alloc_rmap_desc(vcpu); |
cd4a4e53 AK |
515 | desc = desc->more; |
516 | } | |
517 | for (i = 0; desc->shadow_ptes[i]; ++i) | |
518 | ; | |
519 | desc->shadow_ptes[i] = spte; | |
520 | } | |
521 | } | |
522 | ||
290fc38d | 523 | static void rmap_desc_remove_entry(unsigned long *rmapp, |
cd4a4e53 AK |
524 | struct kvm_rmap_desc *desc, |
525 | int i, | |
526 | struct kvm_rmap_desc *prev_desc) | |
527 | { | |
528 | int j; | |
529 | ||
530 | for (j = RMAP_EXT - 1; !desc->shadow_ptes[j] && j > i; --j) | |
531 | ; | |
532 | desc->shadow_ptes[i] = desc->shadow_ptes[j]; | |
11718b4d | 533 | desc->shadow_ptes[j] = NULL; |
cd4a4e53 AK |
534 | if (j != 0) |
535 | return; | |
536 | if (!prev_desc && !desc->more) | |
290fc38d | 537 | *rmapp = (unsigned long)desc->shadow_ptes[0]; |
cd4a4e53 AK |
538 | else |
539 | if (prev_desc) | |
540 | prev_desc->more = desc->more; | |
541 | else | |
290fc38d | 542 | *rmapp = (unsigned long)desc->more | 1; |
90cb0529 | 543 | mmu_free_rmap_desc(desc); |
cd4a4e53 AK |
544 | } |
545 | ||
290fc38d | 546 | static void rmap_remove(struct kvm *kvm, u64 *spte) |
cd4a4e53 | 547 | { |
cd4a4e53 AK |
548 | struct kvm_rmap_desc *desc; |
549 | struct kvm_rmap_desc *prev_desc; | |
4db35314 | 550 | struct kvm_mmu_page *sp; |
35149e21 | 551 | pfn_t pfn; |
290fc38d | 552 | unsigned long *rmapp; |
cd4a4e53 AK |
553 | int i; |
554 | ||
555 | if (!is_rmap_pte(*spte)) | |
556 | return; | |
4db35314 | 557 | sp = page_header(__pa(spte)); |
35149e21 | 558 | pfn = spte_to_pfn(*spte); |
7b52345e | 559 | if (*spte & shadow_accessed_mask) |
35149e21 | 560 | kvm_set_pfn_accessed(pfn); |
b4231d61 | 561 | if (is_writeble_pte(*spte)) |
35149e21 | 562 | kvm_release_pfn_dirty(pfn); |
b4231d61 | 563 | else |
35149e21 | 564 | kvm_release_pfn_clean(pfn); |
05da4558 | 565 | rmapp = gfn_to_rmap(kvm, sp->gfns[spte - sp->spt], is_large_pte(*spte)); |
290fc38d | 566 | if (!*rmapp) { |
cd4a4e53 AK |
567 | printk(KERN_ERR "rmap_remove: %p %llx 0->BUG\n", spte, *spte); |
568 | BUG(); | |
290fc38d | 569 | } else if (!(*rmapp & 1)) { |
cd4a4e53 | 570 | rmap_printk("rmap_remove: %p %llx 1->0\n", spte, *spte); |
290fc38d | 571 | if ((u64 *)*rmapp != spte) { |
cd4a4e53 AK |
572 | printk(KERN_ERR "rmap_remove: %p %llx 1->BUG\n", |
573 | spte, *spte); | |
574 | BUG(); | |
575 | } | |
290fc38d | 576 | *rmapp = 0; |
cd4a4e53 AK |
577 | } else { |
578 | rmap_printk("rmap_remove: %p %llx many->many\n", spte, *spte); | |
290fc38d | 579 | desc = (struct kvm_rmap_desc *)(*rmapp & ~1ul); |
cd4a4e53 AK |
580 | prev_desc = NULL; |
581 | while (desc) { | |
582 | for (i = 0; i < RMAP_EXT && desc->shadow_ptes[i]; ++i) | |
583 | if (desc->shadow_ptes[i] == spte) { | |
290fc38d | 584 | rmap_desc_remove_entry(rmapp, |
714b93da | 585 | desc, i, |
cd4a4e53 AK |
586 | prev_desc); |
587 | return; | |
588 | } | |
589 | prev_desc = desc; | |
590 | desc = desc->more; | |
591 | } | |
592 | BUG(); | |
593 | } | |
594 | } | |
595 | ||
98348e95 | 596 | static u64 *rmap_next(struct kvm *kvm, unsigned long *rmapp, u64 *spte) |
374cbac0 | 597 | { |
374cbac0 | 598 | struct kvm_rmap_desc *desc; |
98348e95 IE |
599 | struct kvm_rmap_desc *prev_desc; |
600 | u64 *prev_spte; | |
601 | int i; | |
602 | ||
603 | if (!*rmapp) | |
604 | return NULL; | |
605 | else if (!(*rmapp & 1)) { | |
606 | if (!spte) | |
607 | return (u64 *)*rmapp; | |
608 | return NULL; | |
609 | } | |
610 | desc = (struct kvm_rmap_desc *)(*rmapp & ~1ul); | |
611 | prev_desc = NULL; | |
612 | prev_spte = NULL; | |
613 | while (desc) { | |
614 | for (i = 0; i < RMAP_EXT && desc->shadow_ptes[i]; ++i) { | |
615 | if (prev_spte == spte) | |
616 | return desc->shadow_ptes[i]; | |
617 | prev_spte = desc->shadow_ptes[i]; | |
618 | } | |
619 | desc = desc->more; | |
620 | } | |
621 | return NULL; | |
622 | } | |
623 | ||
624 | static void rmap_write_protect(struct kvm *kvm, u64 gfn) | |
625 | { | |
290fc38d | 626 | unsigned long *rmapp; |
374cbac0 | 627 | u64 *spte; |
caa5b8a5 | 628 | int write_protected = 0; |
374cbac0 | 629 | |
4a4c9924 | 630 | gfn = unalias_gfn(kvm, gfn); |
05da4558 | 631 | rmapp = gfn_to_rmap(kvm, gfn, 0); |
374cbac0 | 632 | |
98348e95 IE |
633 | spte = rmap_next(kvm, rmapp, NULL); |
634 | while (spte) { | |
374cbac0 | 635 | BUG_ON(!spte); |
374cbac0 | 636 | BUG_ON(!(*spte & PT_PRESENT_MASK)); |
374cbac0 | 637 | rmap_printk("rmap_write_protect: spte %p %llx\n", spte, *spte); |
caa5b8a5 | 638 | if (is_writeble_pte(*spte)) { |
9647c14c | 639 | set_shadow_pte(spte, *spte & ~PT_WRITABLE_MASK); |
caa5b8a5 ED |
640 | write_protected = 1; |
641 | } | |
9647c14c | 642 | spte = rmap_next(kvm, rmapp, spte); |
374cbac0 | 643 | } |
855149aa | 644 | if (write_protected) { |
35149e21 | 645 | pfn_t pfn; |
855149aa IE |
646 | |
647 | spte = rmap_next(kvm, rmapp, NULL); | |
35149e21 AL |
648 | pfn = spte_to_pfn(*spte); |
649 | kvm_set_pfn_dirty(pfn); | |
855149aa IE |
650 | } |
651 | ||
05da4558 MT |
652 | /* check for huge page mappings */ |
653 | rmapp = gfn_to_rmap(kvm, gfn, 1); | |
654 | spte = rmap_next(kvm, rmapp, NULL); | |
655 | while (spte) { | |
656 | BUG_ON(!spte); | |
657 | BUG_ON(!(*spte & PT_PRESENT_MASK)); | |
658 | BUG_ON((*spte & (PT_PAGE_SIZE_MASK|PT_PRESENT_MASK)) != (PT_PAGE_SIZE_MASK|PT_PRESENT_MASK)); | |
659 | pgprintk("rmap_write_protect(large): spte %p %llx %lld\n", spte, *spte, gfn); | |
660 | if (is_writeble_pte(*spte)) { | |
661 | rmap_remove(kvm, spte); | |
662 | --kvm->stat.lpages; | |
663 | set_shadow_pte(spte, shadow_trap_nonpresent_pte); | |
6597ca09 | 664 | spte = NULL; |
05da4558 MT |
665 | write_protected = 1; |
666 | } | |
667 | spte = rmap_next(kvm, rmapp, spte); | |
668 | } | |
669 | ||
caa5b8a5 ED |
670 | if (write_protected) |
671 | kvm_flush_remote_tlbs(kvm); | |
374cbac0 AK |
672 | } |
673 | ||
e930bffe AA |
674 | static int kvm_unmap_rmapp(struct kvm *kvm, unsigned long *rmapp) |
675 | { | |
676 | u64 *spte; | |
677 | int need_tlb_flush = 0; | |
678 | ||
679 | while ((spte = rmap_next(kvm, rmapp, NULL))) { | |
680 | BUG_ON(!(*spte & PT_PRESENT_MASK)); | |
681 | rmap_printk("kvm_rmap_unmap_hva: spte %p %llx\n", spte, *spte); | |
682 | rmap_remove(kvm, spte); | |
683 | set_shadow_pte(spte, shadow_trap_nonpresent_pte); | |
684 | need_tlb_flush = 1; | |
685 | } | |
686 | return need_tlb_flush; | |
687 | } | |
688 | ||
689 | static int kvm_handle_hva(struct kvm *kvm, unsigned long hva, | |
690 | int (*handler)(struct kvm *kvm, unsigned long *rmapp)) | |
691 | { | |
692 | int i; | |
693 | int retval = 0; | |
694 | ||
695 | /* | |
696 | * If mmap_sem isn't taken, we can look the memslots with only | |
697 | * the mmu_lock by skipping over the slots with userspace_addr == 0. | |
698 | */ | |
699 | for (i = 0; i < kvm->nmemslots; i++) { | |
700 | struct kvm_memory_slot *memslot = &kvm->memslots[i]; | |
701 | unsigned long start = memslot->userspace_addr; | |
702 | unsigned long end; | |
703 | ||
704 | /* mmu_lock protects userspace_addr */ | |
705 | if (!start) | |
706 | continue; | |
707 | ||
708 | end = start + (memslot->npages << PAGE_SHIFT); | |
709 | if (hva >= start && hva < end) { | |
710 | gfn_t gfn_offset = (hva - start) >> PAGE_SHIFT; | |
711 | retval |= handler(kvm, &memslot->rmap[gfn_offset]); | |
712 | retval |= handler(kvm, | |
713 | &memslot->lpage_info[ | |
714 | gfn_offset / | |
715 | KVM_PAGES_PER_HPAGE].rmap_pde); | |
716 | } | |
717 | } | |
718 | ||
719 | return retval; | |
720 | } | |
721 | ||
722 | int kvm_unmap_hva(struct kvm *kvm, unsigned long hva) | |
723 | { | |
724 | return kvm_handle_hva(kvm, hva, kvm_unmap_rmapp); | |
725 | } | |
726 | ||
727 | static int kvm_age_rmapp(struct kvm *kvm, unsigned long *rmapp) | |
728 | { | |
729 | u64 *spte; | |
730 | int young = 0; | |
731 | ||
534e38b4 SY |
732 | /* always return old for EPT */ |
733 | if (!shadow_accessed_mask) | |
734 | return 0; | |
735 | ||
e930bffe AA |
736 | spte = rmap_next(kvm, rmapp, NULL); |
737 | while (spte) { | |
738 | int _young; | |
739 | u64 _spte = *spte; | |
740 | BUG_ON(!(_spte & PT_PRESENT_MASK)); | |
741 | _young = _spte & PT_ACCESSED_MASK; | |
742 | if (_young) { | |
743 | young = 1; | |
744 | clear_bit(PT_ACCESSED_SHIFT, (unsigned long *)spte); | |
745 | } | |
746 | spte = rmap_next(kvm, rmapp, spte); | |
747 | } | |
748 | return young; | |
749 | } | |
750 | ||
751 | int kvm_age_hva(struct kvm *kvm, unsigned long hva) | |
752 | { | |
753 | return kvm_handle_hva(kvm, hva, kvm_age_rmapp); | |
754 | } | |
755 | ||
d6c69ee9 | 756 | #ifdef MMU_DEBUG |
47ad8e68 | 757 | static int is_empty_shadow_page(u64 *spt) |
6aa8b732 | 758 | { |
139bdb2d AK |
759 | u64 *pos; |
760 | u64 *end; | |
761 | ||
47ad8e68 | 762 | for (pos = spt, end = pos + PAGE_SIZE / sizeof(u64); pos != end; pos++) |
3c915510 | 763 | if (is_shadow_present_pte(*pos)) { |
b8688d51 | 764 | printk(KERN_ERR "%s: %p %llx\n", __func__, |
139bdb2d | 765 | pos, *pos); |
6aa8b732 | 766 | return 0; |
139bdb2d | 767 | } |
6aa8b732 AK |
768 | return 1; |
769 | } | |
d6c69ee9 | 770 | #endif |
6aa8b732 | 771 | |
4db35314 | 772 | static void kvm_mmu_free_page(struct kvm *kvm, struct kvm_mmu_page *sp) |
260746c0 | 773 | { |
4db35314 AK |
774 | ASSERT(is_empty_shadow_page(sp->spt)); |
775 | list_del(&sp->link); | |
776 | __free_page(virt_to_page(sp->spt)); | |
777 | __free_page(virt_to_page(sp->gfns)); | |
778 | kfree(sp); | |
f05e70ac | 779 | ++kvm->arch.n_free_mmu_pages; |
260746c0 AK |
780 | } |
781 | ||
cea0f0e7 AK |
782 | static unsigned kvm_page_table_hashfn(gfn_t gfn) |
783 | { | |
1ae0a13d | 784 | return gfn & ((1 << KVM_MMU_HASH_SHIFT) - 1); |
cea0f0e7 AK |
785 | } |
786 | ||
25c0de2c AK |
787 | static struct kvm_mmu_page *kvm_mmu_alloc_page(struct kvm_vcpu *vcpu, |
788 | u64 *parent_pte) | |
6aa8b732 | 789 | { |
4db35314 | 790 | struct kvm_mmu_page *sp; |
6aa8b732 | 791 | |
ad312c7c ZX |
792 | sp = mmu_memory_cache_alloc(&vcpu->arch.mmu_page_header_cache, sizeof *sp); |
793 | sp->spt = mmu_memory_cache_alloc(&vcpu->arch.mmu_page_cache, PAGE_SIZE); | |
794 | sp->gfns = mmu_memory_cache_alloc(&vcpu->arch.mmu_page_cache, PAGE_SIZE); | |
4db35314 | 795 | set_page_private(virt_to_page(sp->spt), (unsigned long)sp); |
f05e70ac | 796 | list_add(&sp->link, &vcpu->kvm->arch.active_mmu_pages); |
4db35314 | 797 | ASSERT(is_empty_shadow_page(sp->spt)); |
291f26bc | 798 | bitmap_zero(sp->slot_bitmap, KVM_MEMORY_SLOTS + KVM_PRIVATE_MEM_SLOTS); |
4db35314 AK |
799 | sp->multimapped = 0; |
800 | sp->parent_pte = parent_pte; | |
f05e70ac | 801 | --vcpu->kvm->arch.n_free_mmu_pages; |
4db35314 | 802 | return sp; |
6aa8b732 AK |
803 | } |
804 | ||
714b93da | 805 | static void mmu_page_add_parent_pte(struct kvm_vcpu *vcpu, |
4db35314 | 806 | struct kvm_mmu_page *sp, u64 *parent_pte) |
cea0f0e7 AK |
807 | { |
808 | struct kvm_pte_chain *pte_chain; | |
809 | struct hlist_node *node; | |
810 | int i; | |
811 | ||
812 | if (!parent_pte) | |
813 | return; | |
4db35314 AK |
814 | if (!sp->multimapped) { |
815 | u64 *old = sp->parent_pte; | |
cea0f0e7 AK |
816 | |
817 | if (!old) { | |
4db35314 | 818 | sp->parent_pte = parent_pte; |
cea0f0e7 AK |
819 | return; |
820 | } | |
4db35314 | 821 | sp->multimapped = 1; |
714b93da | 822 | pte_chain = mmu_alloc_pte_chain(vcpu); |
4db35314 AK |
823 | INIT_HLIST_HEAD(&sp->parent_ptes); |
824 | hlist_add_head(&pte_chain->link, &sp->parent_ptes); | |
cea0f0e7 AK |
825 | pte_chain->parent_ptes[0] = old; |
826 | } | |
4db35314 | 827 | hlist_for_each_entry(pte_chain, node, &sp->parent_ptes, link) { |
cea0f0e7 AK |
828 | if (pte_chain->parent_ptes[NR_PTE_CHAIN_ENTRIES-1]) |
829 | continue; | |
830 | for (i = 0; i < NR_PTE_CHAIN_ENTRIES; ++i) | |
831 | if (!pte_chain->parent_ptes[i]) { | |
832 | pte_chain->parent_ptes[i] = parent_pte; | |
833 | return; | |
834 | } | |
835 | } | |
714b93da | 836 | pte_chain = mmu_alloc_pte_chain(vcpu); |
cea0f0e7 | 837 | BUG_ON(!pte_chain); |
4db35314 | 838 | hlist_add_head(&pte_chain->link, &sp->parent_ptes); |
cea0f0e7 AK |
839 | pte_chain->parent_ptes[0] = parent_pte; |
840 | } | |
841 | ||
4db35314 | 842 | static void mmu_page_remove_parent_pte(struct kvm_mmu_page *sp, |
cea0f0e7 AK |
843 | u64 *parent_pte) |
844 | { | |
845 | struct kvm_pte_chain *pte_chain; | |
846 | struct hlist_node *node; | |
847 | int i; | |
848 | ||
4db35314 AK |
849 | if (!sp->multimapped) { |
850 | BUG_ON(sp->parent_pte != parent_pte); | |
851 | sp->parent_pte = NULL; | |
cea0f0e7 AK |
852 | return; |
853 | } | |
4db35314 | 854 | hlist_for_each_entry(pte_chain, node, &sp->parent_ptes, link) |
cea0f0e7 AK |
855 | for (i = 0; i < NR_PTE_CHAIN_ENTRIES; ++i) { |
856 | if (!pte_chain->parent_ptes[i]) | |
857 | break; | |
858 | if (pte_chain->parent_ptes[i] != parent_pte) | |
859 | continue; | |
697fe2e2 AK |
860 | while (i + 1 < NR_PTE_CHAIN_ENTRIES |
861 | && pte_chain->parent_ptes[i + 1]) { | |
cea0f0e7 AK |
862 | pte_chain->parent_ptes[i] |
863 | = pte_chain->parent_ptes[i + 1]; | |
864 | ++i; | |
865 | } | |
866 | pte_chain->parent_ptes[i] = NULL; | |
697fe2e2 AK |
867 | if (i == 0) { |
868 | hlist_del(&pte_chain->link); | |
90cb0529 | 869 | mmu_free_pte_chain(pte_chain); |
4db35314 AK |
870 | if (hlist_empty(&sp->parent_ptes)) { |
871 | sp->multimapped = 0; | |
872 | sp->parent_pte = NULL; | |
697fe2e2 AK |
873 | } |
874 | } | |
cea0f0e7 AK |
875 | return; |
876 | } | |
877 | BUG(); | |
878 | } | |
879 | ||
ad8cfbe3 MT |
880 | |
881 | static void mmu_parent_walk(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp, | |
882 | mmu_parent_walk_fn fn) | |
883 | { | |
884 | struct kvm_pte_chain *pte_chain; | |
885 | struct hlist_node *node; | |
886 | struct kvm_mmu_page *parent_sp; | |
887 | int i; | |
888 | ||
889 | if (!sp->multimapped && sp->parent_pte) { | |
890 | parent_sp = page_header(__pa(sp->parent_pte)); | |
891 | fn(vcpu, parent_sp); | |
892 | mmu_parent_walk(vcpu, parent_sp, fn); | |
893 | return; | |
894 | } | |
895 | hlist_for_each_entry(pte_chain, node, &sp->parent_ptes, link) | |
896 | for (i = 0; i < NR_PTE_CHAIN_ENTRIES; ++i) { | |
897 | if (!pte_chain->parent_ptes[i]) | |
898 | break; | |
899 | parent_sp = page_header(__pa(pte_chain->parent_ptes[i])); | |
900 | fn(vcpu, parent_sp); | |
901 | mmu_parent_walk(vcpu, parent_sp, fn); | |
902 | } | |
903 | } | |
904 | ||
0074ff63 MT |
905 | static void kvm_mmu_update_unsync_bitmap(u64 *spte) |
906 | { | |
907 | unsigned int index; | |
908 | struct kvm_mmu_page *sp = page_header(__pa(spte)); | |
909 | ||
910 | index = spte - sp->spt; | |
911 | __set_bit(index, sp->unsync_child_bitmap); | |
912 | sp->unsync_children = 1; | |
913 | } | |
914 | ||
915 | static void kvm_mmu_update_parents_unsync(struct kvm_mmu_page *sp) | |
916 | { | |
917 | struct kvm_pte_chain *pte_chain; | |
918 | struct hlist_node *node; | |
919 | int i; | |
920 | ||
921 | if (!sp->parent_pte) | |
922 | return; | |
923 | ||
924 | if (!sp->multimapped) { | |
925 | kvm_mmu_update_unsync_bitmap(sp->parent_pte); | |
926 | return; | |
927 | } | |
928 | ||
929 | hlist_for_each_entry(pte_chain, node, &sp->parent_ptes, link) | |
930 | for (i = 0; i < NR_PTE_CHAIN_ENTRIES; ++i) { | |
931 | if (!pte_chain->parent_ptes[i]) | |
932 | break; | |
933 | kvm_mmu_update_unsync_bitmap(pte_chain->parent_ptes[i]); | |
934 | } | |
935 | } | |
936 | ||
937 | static int unsync_walk_fn(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp) | |
938 | { | |
939 | sp->unsync_children = 1; | |
940 | kvm_mmu_update_parents_unsync(sp); | |
941 | return 1; | |
942 | } | |
943 | ||
944 | static void kvm_mmu_mark_parents_unsync(struct kvm_vcpu *vcpu, | |
945 | struct kvm_mmu_page *sp) | |
946 | { | |
947 | mmu_parent_walk(vcpu, sp, unsync_walk_fn); | |
948 | kvm_mmu_update_parents_unsync(sp); | |
949 | } | |
950 | ||
d761a501 AK |
951 | static void nonpaging_prefetch_page(struct kvm_vcpu *vcpu, |
952 | struct kvm_mmu_page *sp) | |
953 | { | |
954 | int i; | |
955 | ||
956 | for (i = 0; i < PT64_ENT_PER_PAGE; ++i) | |
957 | sp->spt[i] = shadow_trap_nonpresent_pte; | |
958 | } | |
959 | ||
e8bc217a MT |
960 | static int nonpaging_sync_page(struct kvm_vcpu *vcpu, |
961 | struct kvm_mmu_page *sp) | |
962 | { | |
963 | return 1; | |
964 | } | |
965 | ||
a7052897 MT |
966 | static void nonpaging_invlpg(struct kvm_vcpu *vcpu, gva_t gva) |
967 | { | |
968 | } | |
969 | ||
0074ff63 MT |
970 | #define for_each_unsync_children(bitmap, idx) \ |
971 | for (idx = find_first_bit(bitmap, 512); \ | |
972 | idx < 512; \ | |
973 | idx = find_next_bit(bitmap, 512, idx+1)) | |
974 | ||
4731d4c7 MT |
975 | static int mmu_unsync_walk(struct kvm_mmu_page *sp, |
976 | struct kvm_unsync_walk *walker) | |
977 | { | |
978 | int i, ret; | |
979 | ||
980 | if (!sp->unsync_children) | |
981 | return 0; | |
982 | ||
0074ff63 | 983 | for_each_unsync_children(sp->unsync_child_bitmap, i) { |
4731d4c7 MT |
984 | u64 ent = sp->spt[i]; |
985 | ||
986 | if (is_shadow_present_pte(ent)) { | |
987 | struct kvm_mmu_page *child; | |
988 | child = page_header(ent & PT64_BASE_ADDR_MASK); | |
989 | ||
990 | if (child->unsync_children) { | |
991 | ret = mmu_unsync_walk(child, walker); | |
992 | if (ret) | |
993 | return ret; | |
0074ff63 | 994 | __clear_bit(i, sp->unsync_child_bitmap); |
4731d4c7 MT |
995 | } |
996 | ||
997 | if (child->unsync) { | |
998 | ret = walker->entry(child, walker); | |
0074ff63 | 999 | __clear_bit(i, sp->unsync_child_bitmap); |
4731d4c7 MT |
1000 | if (ret) |
1001 | return ret; | |
1002 | } | |
1003 | } | |
1004 | } | |
1005 | ||
0074ff63 | 1006 | if (find_first_bit(sp->unsync_child_bitmap, 512) == 512) |
4731d4c7 MT |
1007 | sp->unsync_children = 0; |
1008 | ||
1009 | return 0; | |
1010 | } | |
1011 | ||
4db35314 | 1012 | static struct kvm_mmu_page *kvm_mmu_lookup_page(struct kvm *kvm, gfn_t gfn) |
cea0f0e7 AK |
1013 | { |
1014 | unsigned index; | |
1015 | struct hlist_head *bucket; | |
4db35314 | 1016 | struct kvm_mmu_page *sp; |
cea0f0e7 AK |
1017 | struct hlist_node *node; |
1018 | ||
b8688d51 | 1019 | pgprintk("%s: looking for gfn %lx\n", __func__, gfn); |
1ae0a13d | 1020 | index = kvm_page_table_hashfn(gfn); |
f05e70ac | 1021 | bucket = &kvm->arch.mmu_page_hash[index]; |
4db35314 | 1022 | hlist_for_each_entry(sp, node, bucket, hash_link) |
2e53d63a MT |
1023 | if (sp->gfn == gfn && !sp->role.metaphysical |
1024 | && !sp->role.invalid) { | |
cea0f0e7 | 1025 | pgprintk("%s: found role %x\n", |
b8688d51 | 1026 | __func__, sp->role.word); |
4db35314 | 1027 | return sp; |
cea0f0e7 AK |
1028 | } |
1029 | return NULL; | |
1030 | } | |
1031 | ||
4731d4c7 MT |
1032 | static void kvm_unlink_unsync_page(struct kvm *kvm, struct kvm_mmu_page *sp) |
1033 | { | |
1034 | WARN_ON(!sp->unsync); | |
1035 | sp->unsync = 0; | |
1036 | --kvm->stat.mmu_unsync; | |
1037 | } | |
1038 | ||
1039 | static int kvm_mmu_zap_page(struct kvm *kvm, struct kvm_mmu_page *sp); | |
1040 | ||
1041 | static int kvm_sync_page(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp) | |
1042 | { | |
1043 | if (sp->role.glevels != vcpu->arch.mmu.root_level) { | |
1044 | kvm_mmu_zap_page(vcpu->kvm, sp); | |
1045 | return 1; | |
1046 | } | |
1047 | ||
1048 | rmap_write_protect(vcpu->kvm, sp->gfn); | |
0c0f40bd | 1049 | kvm_unlink_unsync_page(vcpu->kvm, sp); |
4731d4c7 MT |
1050 | if (vcpu->arch.mmu.sync_page(vcpu, sp)) { |
1051 | kvm_mmu_zap_page(vcpu->kvm, sp); | |
1052 | return 1; | |
1053 | } | |
1054 | ||
1055 | kvm_mmu_flush_tlb(vcpu); | |
4731d4c7 MT |
1056 | return 0; |
1057 | } | |
1058 | ||
1059 | struct sync_walker { | |
1060 | struct kvm_vcpu *vcpu; | |
1061 | struct kvm_unsync_walk walker; | |
1062 | }; | |
1063 | ||
1064 | static int mmu_sync_fn(struct kvm_mmu_page *sp, struct kvm_unsync_walk *walk) | |
1065 | { | |
1066 | struct sync_walker *sync_walk = container_of(walk, struct sync_walker, | |
1067 | walker); | |
1068 | struct kvm_vcpu *vcpu = sync_walk->vcpu; | |
1069 | ||
1070 | kvm_sync_page(vcpu, sp); | |
1071 | return (need_resched() || spin_needbreak(&vcpu->kvm->mmu_lock)); | |
1072 | } | |
1073 | ||
1074 | static void mmu_sync_children(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp) | |
1075 | { | |
1076 | struct sync_walker walker = { | |
1077 | .walker = { .entry = mmu_sync_fn, }, | |
1078 | .vcpu = vcpu, | |
1079 | }; | |
1080 | ||
1081 | while (mmu_unsync_walk(sp, &walker.walker)) | |
1082 | cond_resched_lock(&vcpu->kvm->mmu_lock); | |
1083 | } | |
1084 | ||
cea0f0e7 AK |
1085 | static struct kvm_mmu_page *kvm_mmu_get_page(struct kvm_vcpu *vcpu, |
1086 | gfn_t gfn, | |
1087 | gva_t gaddr, | |
1088 | unsigned level, | |
1089 | int metaphysical, | |
41074d07 | 1090 | unsigned access, |
f7d9c7b7 | 1091 | u64 *parent_pte) |
cea0f0e7 AK |
1092 | { |
1093 | union kvm_mmu_page_role role; | |
1094 | unsigned index; | |
1095 | unsigned quadrant; | |
1096 | struct hlist_head *bucket; | |
4db35314 | 1097 | struct kvm_mmu_page *sp; |
4731d4c7 | 1098 | struct hlist_node *node, *tmp; |
cea0f0e7 AK |
1099 | |
1100 | role.word = 0; | |
ad312c7c | 1101 | role.glevels = vcpu->arch.mmu.root_level; |
cea0f0e7 AK |
1102 | role.level = level; |
1103 | role.metaphysical = metaphysical; | |
41074d07 | 1104 | role.access = access; |
ad312c7c | 1105 | if (vcpu->arch.mmu.root_level <= PT32_ROOT_LEVEL) { |
cea0f0e7 AK |
1106 | quadrant = gaddr >> (PAGE_SHIFT + (PT64_PT_BITS * level)); |
1107 | quadrant &= (1 << ((PT32_PT_BITS - PT64_PT_BITS) * level)) - 1; | |
1108 | role.quadrant = quadrant; | |
1109 | } | |
b8688d51 | 1110 | pgprintk("%s: looking gfn %lx role %x\n", __func__, |
cea0f0e7 | 1111 | gfn, role.word); |
1ae0a13d | 1112 | index = kvm_page_table_hashfn(gfn); |
f05e70ac | 1113 | bucket = &vcpu->kvm->arch.mmu_page_hash[index]; |
4731d4c7 MT |
1114 | hlist_for_each_entry_safe(sp, node, tmp, bucket, hash_link) |
1115 | if (sp->gfn == gfn) { | |
1116 | if (sp->unsync) | |
1117 | if (kvm_sync_page(vcpu, sp)) | |
1118 | continue; | |
1119 | ||
1120 | if (sp->role.word != role.word) | |
1121 | continue; | |
1122 | ||
4db35314 | 1123 | mmu_page_add_parent_pte(vcpu, sp, parent_pte); |
0074ff63 MT |
1124 | if (sp->unsync_children) { |
1125 | set_bit(KVM_REQ_MMU_SYNC, &vcpu->requests); | |
1126 | kvm_mmu_mark_parents_unsync(vcpu, sp); | |
1127 | } | |
b8688d51 | 1128 | pgprintk("%s: found\n", __func__); |
4db35314 | 1129 | return sp; |
cea0f0e7 | 1130 | } |
dfc5aa00 | 1131 | ++vcpu->kvm->stat.mmu_cache_miss; |
4db35314 AK |
1132 | sp = kvm_mmu_alloc_page(vcpu, parent_pte); |
1133 | if (!sp) | |
1134 | return sp; | |
b8688d51 | 1135 | pgprintk("%s: adding gfn %lx role %x\n", __func__, gfn, role.word); |
4db35314 AK |
1136 | sp->gfn = gfn; |
1137 | sp->role = role; | |
1138 | hlist_add_head(&sp->hash_link, bucket); | |
4731d4c7 | 1139 | if (!metaphysical) { |
4a4c9924 | 1140 | rmap_write_protect(vcpu->kvm, gfn); |
4731d4c7 MT |
1141 | account_shadowed(vcpu->kvm, gfn); |
1142 | } | |
131d8279 AK |
1143 | if (shadow_trap_nonpresent_pte != shadow_notrap_nonpresent_pte) |
1144 | vcpu->arch.mmu.prefetch_page(vcpu, sp); | |
1145 | else | |
1146 | nonpaging_prefetch_page(vcpu, sp); | |
4db35314 | 1147 | return sp; |
cea0f0e7 AK |
1148 | } |
1149 | ||
3d000db5 | 1150 | static int walk_shadow(struct kvm_shadow_walk *walker, |
d40a1ee4 | 1151 | struct kvm_vcpu *vcpu, u64 addr) |
3d000db5 AK |
1152 | { |
1153 | hpa_t shadow_addr; | |
1154 | int level; | |
1155 | int r; | |
1156 | u64 *sptep; | |
1157 | unsigned index; | |
1158 | ||
1159 | shadow_addr = vcpu->arch.mmu.root_hpa; | |
1160 | level = vcpu->arch.mmu.shadow_root_level; | |
1161 | if (level == PT32E_ROOT_LEVEL) { | |
1162 | shadow_addr = vcpu->arch.mmu.pae_root[(addr >> 30) & 3]; | |
1163 | shadow_addr &= PT64_BASE_ADDR_MASK; | |
1164 | --level; | |
1165 | } | |
1166 | ||
1167 | while (level >= PT_PAGE_TABLE_LEVEL) { | |
1168 | index = SHADOW_PT_INDEX(addr, level); | |
1169 | sptep = ((u64 *)__va(shadow_addr)) + index; | |
1170 | r = walker->entry(walker, vcpu, addr, sptep, level); | |
1171 | if (r) | |
1172 | return r; | |
1173 | shadow_addr = *sptep & PT64_BASE_ADDR_MASK; | |
1174 | --level; | |
1175 | } | |
1176 | return 0; | |
1177 | } | |
1178 | ||
90cb0529 | 1179 | static void kvm_mmu_page_unlink_children(struct kvm *kvm, |
4db35314 | 1180 | struct kvm_mmu_page *sp) |
a436036b | 1181 | { |
697fe2e2 AK |
1182 | unsigned i; |
1183 | u64 *pt; | |
1184 | u64 ent; | |
1185 | ||
4db35314 | 1186 | pt = sp->spt; |
697fe2e2 | 1187 | |
4db35314 | 1188 | if (sp->role.level == PT_PAGE_TABLE_LEVEL) { |
697fe2e2 | 1189 | for (i = 0; i < PT64_ENT_PER_PAGE; ++i) { |
c7addb90 | 1190 | if (is_shadow_present_pte(pt[i])) |
290fc38d | 1191 | rmap_remove(kvm, &pt[i]); |
c7addb90 | 1192 | pt[i] = shadow_trap_nonpresent_pte; |
697fe2e2 AK |
1193 | } |
1194 | return; | |
1195 | } | |
1196 | ||
1197 | for (i = 0; i < PT64_ENT_PER_PAGE; ++i) { | |
1198 | ent = pt[i]; | |
1199 | ||
05da4558 MT |
1200 | if (is_shadow_present_pte(ent)) { |
1201 | if (!is_large_pte(ent)) { | |
1202 | ent &= PT64_BASE_ADDR_MASK; | |
1203 | mmu_page_remove_parent_pte(page_header(ent), | |
1204 | &pt[i]); | |
1205 | } else { | |
1206 | --kvm->stat.lpages; | |
1207 | rmap_remove(kvm, &pt[i]); | |
1208 | } | |
1209 | } | |
c7addb90 | 1210 | pt[i] = shadow_trap_nonpresent_pte; |
697fe2e2 | 1211 | } |
a436036b AK |
1212 | } |
1213 | ||
4db35314 | 1214 | static void kvm_mmu_put_page(struct kvm_mmu_page *sp, u64 *parent_pte) |
cea0f0e7 | 1215 | { |
4db35314 | 1216 | mmu_page_remove_parent_pte(sp, parent_pte); |
a436036b AK |
1217 | } |
1218 | ||
12b7d28f AK |
1219 | static void kvm_mmu_reset_last_pte_updated(struct kvm *kvm) |
1220 | { | |
1221 | int i; | |
1222 | ||
1223 | for (i = 0; i < KVM_MAX_VCPUS; ++i) | |
1224 | if (kvm->vcpus[i]) | |
ad312c7c | 1225 | kvm->vcpus[i]->arch.last_pte_updated = NULL; |
12b7d28f AK |
1226 | } |
1227 | ||
31aa2b44 | 1228 | static void kvm_mmu_unlink_parents(struct kvm *kvm, struct kvm_mmu_page *sp) |
a436036b AK |
1229 | { |
1230 | u64 *parent_pte; | |
1231 | ||
4db35314 AK |
1232 | while (sp->multimapped || sp->parent_pte) { |
1233 | if (!sp->multimapped) | |
1234 | parent_pte = sp->parent_pte; | |
a436036b AK |
1235 | else { |
1236 | struct kvm_pte_chain *chain; | |
1237 | ||
4db35314 | 1238 | chain = container_of(sp->parent_ptes.first, |
a436036b AK |
1239 | struct kvm_pte_chain, link); |
1240 | parent_pte = chain->parent_ptes[0]; | |
1241 | } | |
697fe2e2 | 1242 | BUG_ON(!parent_pte); |
4db35314 | 1243 | kvm_mmu_put_page(sp, parent_pte); |
c7addb90 | 1244 | set_shadow_pte(parent_pte, shadow_trap_nonpresent_pte); |
a436036b | 1245 | } |
31aa2b44 AK |
1246 | } |
1247 | ||
4731d4c7 MT |
1248 | struct zap_walker { |
1249 | struct kvm_unsync_walk walker; | |
1250 | struct kvm *kvm; | |
1251 | int zapped; | |
1252 | }; | |
1253 | ||
1254 | static int mmu_zap_fn(struct kvm_mmu_page *sp, struct kvm_unsync_walk *walk) | |
1255 | { | |
1256 | struct zap_walker *zap_walk = container_of(walk, struct zap_walker, | |
1257 | walker); | |
1258 | kvm_mmu_zap_page(zap_walk->kvm, sp); | |
1259 | zap_walk->zapped = 1; | |
1260 | return 0; | |
1261 | } | |
1262 | ||
1263 | static int mmu_zap_unsync_children(struct kvm *kvm, struct kvm_mmu_page *sp) | |
1264 | { | |
1265 | struct zap_walker walker = { | |
1266 | .walker = { .entry = mmu_zap_fn, }, | |
1267 | .kvm = kvm, | |
1268 | .zapped = 0, | |
1269 | }; | |
1270 | ||
1271 | if (sp->role.level == PT_PAGE_TABLE_LEVEL) | |
1272 | return 0; | |
1273 | mmu_unsync_walk(sp, &walker.walker); | |
1274 | return walker.zapped; | |
1275 | } | |
1276 | ||
07385413 | 1277 | static int kvm_mmu_zap_page(struct kvm *kvm, struct kvm_mmu_page *sp) |
31aa2b44 | 1278 | { |
4731d4c7 | 1279 | int ret; |
31aa2b44 | 1280 | ++kvm->stat.mmu_shadow_zapped; |
4731d4c7 | 1281 | ret = mmu_zap_unsync_children(kvm, sp); |
4db35314 | 1282 | kvm_mmu_page_unlink_children(kvm, sp); |
31aa2b44 | 1283 | kvm_mmu_unlink_parents(kvm, sp); |
5b5c6a5a AK |
1284 | kvm_flush_remote_tlbs(kvm); |
1285 | if (!sp->role.invalid && !sp->role.metaphysical) | |
1286 | unaccount_shadowed(kvm, sp->gfn); | |
4731d4c7 MT |
1287 | if (sp->unsync) |
1288 | kvm_unlink_unsync_page(kvm, sp); | |
4db35314 AK |
1289 | if (!sp->root_count) { |
1290 | hlist_del(&sp->hash_link); | |
1291 | kvm_mmu_free_page(kvm, sp); | |
2e53d63a | 1292 | } else { |
2e53d63a | 1293 | sp->role.invalid = 1; |
5b5c6a5a | 1294 | list_move(&sp->link, &kvm->arch.active_mmu_pages); |
2e53d63a MT |
1295 | kvm_reload_remote_mmus(kvm); |
1296 | } | |
12b7d28f | 1297 | kvm_mmu_reset_last_pte_updated(kvm); |
4731d4c7 | 1298 | return ret; |
a436036b AK |
1299 | } |
1300 | ||
82ce2c96 IE |
1301 | /* |
1302 | * Changing the number of mmu pages allocated to the vm | |
1303 | * Note: if kvm_nr_mmu_pages is too small, you will get dead lock | |
1304 | */ | |
1305 | void kvm_mmu_change_mmu_pages(struct kvm *kvm, unsigned int kvm_nr_mmu_pages) | |
1306 | { | |
1307 | /* | |
1308 | * If we set the number of mmu pages to be smaller be than the | |
1309 | * number of actived pages , we must to free some mmu pages before we | |
1310 | * change the value | |
1311 | */ | |
1312 | ||
f05e70ac | 1313 | if ((kvm->arch.n_alloc_mmu_pages - kvm->arch.n_free_mmu_pages) > |
82ce2c96 | 1314 | kvm_nr_mmu_pages) { |
f05e70ac ZX |
1315 | int n_used_mmu_pages = kvm->arch.n_alloc_mmu_pages |
1316 | - kvm->arch.n_free_mmu_pages; | |
82ce2c96 IE |
1317 | |
1318 | while (n_used_mmu_pages > kvm_nr_mmu_pages) { | |
1319 | struct kvm_mmu_page *page; | |
1320 | ||
f05e70ac | 1321 | page = container_of(kvm->arch.active_mmu_pages.prev, |
82ce2c96 IE |
1322 | struct kvm_mmu_page, link); |
1323 | kvm_mmu_zap_page(kvm, page); | |
1324 | n_used_mmu_pages--; | |
1325 | } | |
f05e70ac | 1326 | kvm->arch.n_free_mmu_pages = 0; |
82ce2c96 IE |
1327 | } |
1328 | else | |
f05e70ac ZX |
1329 | kvm->arch.n_free_mmu_pages += kvm_nr_mmu_pages |
1330 | - kvm->arch.n_alloc_mmu_pages; | |
82ce2c96 | 1331 | |
f05e70ac | 1332 | kvm->arch.n_alloc_mmu_pages = kvm_nr_mmu_pages; |
82ce2c96 IE |
1333 | } |
1334 | ||
f67a46f4 | 1335 | static int kvm_mmu_unprotect_page(struct kvm *kvm, gfn_t gfn) |
a436036b AK |
1336 | { |
1337 | unsigned index; | |
1338 | struct hlist_head *bucket; | |
4db35314 | 1339 | struct kvm_mmu_page *sp; |
a436036b AK |
1340 | struct hlist_node *node, *n; |
1341 | int r; | |
1342 | ||
b8688d51 | 1343 | pgprintk("%s: looking for gfn %lx\n", __func__, gfn); |
a436036b | 1344 | r = 0; |
1ae0a13d | 1345 | index = kvm_page_table_hashfn(gfn); |
f05e70ac | 1346 | bucket = &kvm->arch.mmu_page_hash[index]; |
4db35314 AK |
1347 | hlist_for_each_entry_safe(sp, node, n, bucket, hash_link) |
1348 | if (sp->gfn == gfn && !sp->role.metaphysical) { | |
b8688d51 | 1349 | pgprintk("%s: gfn %lx role %x\n", __func__, gfn, |
4db35314 | 1350 | sp->role.word); |
a436036b | 1351 | r = 1; |
07385413 MT |
1352 | if (kvm_mmu_zap_page(kvm, sp)) |
1353 | n = bucket->first; | |
a436036b AK |
1354 | } |
1355 | return r; | |
cea0f0e7 AK |
1356 | } |
1357 | ||
f67a46f4 | 1358 | static void mmu_unshadow(struct kvm *kvm, gfn_t gfn) |
97a0a01e | 1359 | { |
4db35314 | 1360 | struct kvm_mmu_page *sp; |
97a0a01e | 1361 | |
4db35314 | 1362 | while ((sp = kvm_mmu_lookup_page(kvm, gfn)) != NULL) { |
b8688d51 | 1363 | pgprintk("%s: zap %lx %x\n", __func__, gfn, sp->role.word); |
4db35314 | 1364 | kvm_mmu_zap_page(kvm, sp); |
97a0a01e AK |
1365 | } |
1366 | } | |
1367 | ||
38c335f1 | 1368 | static void page_header_update_slot(struct kvm *kvm, void *pte, gfn_t gfn) |
6aa8b732 | 1369 | { |
38c335f1 | 1370 | int slot = memslot_id(kvm, gfn_to_memslot(kvm, gfn)); |
4db35314 | 1371 | struct kvm_mmu_page *sp = page_header(__pa(pte)); |
6aa8b732 | 1372 | |
291f26bc | 1373 | __set_bit(slot, sp->slot_bitmap); |
6aa8b732 AK |
1374 | } |
1375 | ||
6844dec6 MT |
1376 | static void mmu_convert_notrap(struct kvm_mmu_page *sp) |
1377 | { | |
1378 | int i; | |
1379 | u64 *pt = sp->spt; | |
1380 | ||
1381 | if (shadow_trap_nonpresent_pte == shadow_notrap_nonpresent_pte) | |
1382 | return; | |
1383 | ||
1384 | for (i = 0; i < PT64_ENT_PER_PAGE; ++i) { | |
1385 | if (pt[i] == shadow_notrap_nonpresent_pte) | |
1386 | set_shadow_pte(&pt[i], shadow_trap_nonpresent_pte); | |
1387 | } | |
1388 | } | |
1389 | ||
039576c0 AK |
1390 | struct page *gva_to_page(struct kvm_vcpu *vcpu, gva_t gva) |
1391 | { | |
72dc67a6 IE |
1392 | struct page *page; |
1393 | ||
ad312c7c | 1394 | gpa_t gpa = vcpu->arch.mmu.gva_to_gpa(vcpu, gva); |
039576c0 AK |
1395 | |
1396 | if (gpa == UNMAPPED_GVA) | |
1397 | return NULL; | |
72dc67a6 | 1398 | |
72dc67a6 | 1399 | page = gfn_to_page(vcpu->kvm, gpa >> PAGE_SHIFT); |
72dc67a6 IE |
1400 | |
1401 | return page; | |
039576c0 AK |
1402 | } |
1403 | ||
74be52e3 SY |
1404 | /* |
1405 | * The function is based on mtrr_type_lookup() in | |
1406 | * arch/x86/kernel/cpu/mtrr/generic.c | |
1407 | */ | |
1408 | static int get_mtrr_type(struct mtrr_state_type *mtrr_state, | |
1409 | u64 start, u64 end) | |
1410 | { | |
1411 | int i; | |
1412 | u64 base, mask; | |
1413 | u8 prev_match, curr_match; | |
1414 | int num_var_ranges = KVM_NR_VAR_MTRR; | |
1415 | ||
1416 | if (!mtrr_state->enabled) | |
1417 | return 0xFF; | |
1418 | ||
1419 | /* Make end inclusive end, instead of exclusive */ | |
1420 | end--; | |
1421 | ||
1422 | /* Look in fixed ranges. Just return the type as per start */ | |
1423 | if (mtrr_state->have_fixed && (start < 0x100000)) { | |
1424 | int idx; | |
1425 | ||
1426 | if (start < 0x80000) { | |
1427 | idx = 0; | |
1428 | idx += (start >> 16); | |
1429 | return mtrr_state->fixed_ranges[idx]; | |
1430 | } else if (start < 0xC0000) { | |
1431 | idx = 1 * 8; | |
1432 | idx += ((start - 0x80000) >> 14); | |
1433 | return mtrr_state->fixed_ranges[idx]; | |
1434 | } else if (start < 0x1000000) { | |
1435 | idx = 3 * 8; | |
1436 | idx += ((start - 0xC0000) >> 12); | |
1437 | return mtrr_state->fixed_ranges[idx]; | |
1438 | } | |
1439 | } | |
1440 | ||
1441 | /* | |
1442 | * Look in variable ranges | |
1443 | * Look of multiple ranges matching this address and pick type | |
1444 | * as per MTRR precedence | |
1445 | */ | |
1446 | if (!(mtrr_state->enabled & 2)) | |
1447 | return mtrr_state->def_type; | |
1448 | ||
1449 | prev_match = 0xFF; | |
1450 | for (i = 0; i < num_var_ranges; ++i) { | |
1451 | unsigned short start_state, end_state; | |
1452 | ||
1453 | if (!(mtrr_state->var_ranges[i].mask_lo & (1 << 11))) | |
1454 | continue; | |
1455 | ||
1456 | base = (((u64)mtrr_state->var_ranges[i].base_hi) << 32) + | |
1457 | (mtrr_state->var_ranges[i].base_lo & PAGE_MASK); | |
1458 | mask = (((u64)mtrr_state->var_ranges[i].mask_hi) << 32) + | |
1459 | (mtrr_state->var_ranges[i].mask_lo & PAGE_MASK); | |
1460 | ||
1461 | start_state = ((start & mask) == (base & mask)); | |
1462 | end_state = ((end & mask) == (base & mask)); | |
1463 | if (start_state != end_state) | |
1464 | return 0xFE; | |
1465 | ||
1466 | if ((start & mask) != (base & mask)) | |
1467 | continue; | |
1468 | ||
1469 | curr_match = mtrr_state->var_ranges[i].base_lo & 0xff; | |
1470 | if (prev_match == 0xFF) { | |
1471 | prev_match = curr_match; | |
1472 | continue; | |
1473 | } | |
1474 | ||
1475 | if (prev_match == MTRR_TYPE_UNCACHABLE || | |
1476 | curr_match == MTRR_TYPE_UNCACHABLE) | |
1477 | return MTRR_TYPE_UNCACHABLE; | |
1478 | ||
1479 | if ((prev_match == MTRR_TYPE_WRBACK && | |
1480 | curr_match == MTRR_TYPE_WRTHROUGH) || | |
1481 | (prev_match == MTRR_TYPE_WRTHROUGH && | |
1482 | curr_match == MTRR_TYPE_WRBACK)) { | |
1483 | prev_match = MTRR_TYPE_WRTHROUGH; | |
1484 | curr_match = MTRR_TYPE_WRTHROUGH; | |
1485 | } | |
1486 | ||
1487 | if (prev_match != curr_match) | |
1488 | return MTRR_TYPE_UNCACHABLE; | |
1489 | } | |
1490 | ||
1491 | if (prev_match != 0xFF) | |
1492 | return prev_match; | |
1493 | ||
1494 | return mtrr_state->def_type; | |
1495 | } | |
1496 | ||
1497 | static u8 get_memory_type(struct kvm_vcpu *vcpu, gfn_t gfn) | |
1498 | { | |
1499 | u8 mtrr; | |
1500 | ||
1501 | mtrr = get_mtrr_type(&vcpu->arch.mtrr_state, gfn << PAGE_SHIFT, | |
1502 | (gfn << PAGE_SHIFT) + PAGE_SIZE); | |
1503 | if (mtrr == 0xfe || mtrr == 0xff) | |
1504 | mtrr = MTRR_TYPE_WRBACK; | |
1505 | return mtrr; | |
1506 | } | |
1507 | ||
4731d4c7 MT |
1508 | static int kvm_unsync_page(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp) |
1509 | { | |
1510 | unsigned index; | |
1511 | struct hlist_head *bucket; | |
1512 | struct kvm_mmu_page *s; | |
1513 | struct hlist_node *node, *n; | |
1514 | ||
1515 | index = kvm_page_table_hashfn(sp->gfn); | |
1516 | bucket = &vcpu->kvm->arch.mmu_page_hash[index]; | |
1517 | /* don't unsync if pagetable is shadowed with multiple roles */ | |
1518 | hlist_for_each_entry_safe(s, node, n, bucket, hash_link) { | |
1519 | if (s->gfn != sp->gfn || s->role.metaphysical) | |
1520 | continue; | |
1521 | if (s->role.word != sp->role.word) | |
1522 | return 1; | |
1523 | } | |
0074ff63 | 1524 | kvm_mmu_mark_parents_unsync(vcpu, sp); |
4731d4c7 MT |
1525 | ++vcpu->kvm->stat.mmu_unsync; |
1526 | sp->unsync = 1; | |
1527 | mmu_convert_notrap(sp); | |
1528 | return 0; | |
1529 | } | |
1530 | ||
1531 | static int mmu_need_write_protect(struct kvm_vcpu *vcpu, gfn_t gfn, | |
1532 | bool can_unsync) | |
1533 | { | |
1534 | struct kvm_mmu_page *shadow; | |
1535 | ||
1536 | shadow = kvm_mmu_lookup_page(vcpu->kvm, gfn); | |
1537 | if (shadow) { | |
1538 | if (shadow->role.level != PT_PAGE_TABLE_LEVEL) | |
1539 | return 1; | |
1540 | if (shadow->unsync) | |
1541 | return 0; | |
582801a9 | 1542 | if (can_unsync && oos_shadow) |
4731d4c7 MT |
1543 | return kvm_unsync_page(vcpu, shadow); |
1544 | return 1; | |
1545 | } | |
1546 | return 0; | |
1547 | } | |
1548 | ||
1e73f9dd MT |
1549 | static int set_spte(struct kvm_vcpu *vcpu, u64 *shadow_pte, |
1550 | unsigned pte_access, int user_fault, | |
1551 | int write_fault, int dirty, int largepage, | |
4731d4c7 MT |
1552 | gfn_t gfn, pfn_t pfn, bool speculative, |
1553 | bool can_unsync) | |
1c4f1fd6 AK |
1554 | { |
1555 | u64 spte; | |
1e73f9dd | 1556 | int ret = 0; |
64d4d521 SY |
1557 | u64 mt_mask = shadow_mt_mask; |
1558 | ||
1c4f1fd6 AK |
1559 | /* |
1560 | * We don't set the accessed bit, since we sometimes want to see | |
1561 | * whether the guest actually used the pte (in order to detect | |
1562 | * demand paging). | |
1563 | */ | |
7b52345e | 1564 | spte = shadow_base_present_pte | shadow_dirty_mask; |
947da538 | 1565 | if (!speculative) |
3201b5d9 | 1566 | spte |= shadow_accessed_mask; |
1c4f1fd6 AK |
1567 | if (!dirty) |
1568 | pte_access &= ~ACC_WRITE_MASK; | |
7b52345e SY |
1569 | if (pte_access & ACC_EXEC_MASK) |
1570 | spte |= shadow_x_mask; | |
1571 | else | |
1572 | spte |= shadow_nx_mask; | |
1c4f1fd6 | 1573 | if (pte_access & ACC_USER_MASK) |
7b52345e | 1574 | spte |= shadow_user_mask; |
05da4558 MT |
1575 | if (largepage) |
1576 | spte |= PT_PAGE_SIZE_MASK; | |
64d4d521 SY |
1577 | if (mt_mask) { |
1578 | mt_mask = get_memory_type(vcpu, gfn) << | |
1579 | kvm_x86_ops->get_mt_mask_shift(); | |
1580 | spte |= mt_mask; | |
1581 | } | |
1c4f1fd6 | 1582 | |
35149e21 | 1583 | spte |= (u64)pfn << PAGE_SHIFT; |
1c4f1fd6 AK |
1584 | |
1585 | if ((pte_access & ACC_WRITE_MASK) | |
1586 | || (write_fault && !is_write_protection(vcpu) && !user_fault)) { | |
1c4f1fd6 | 1587 | |
38187c83 MT |
1588 | if (largepage && has_wrprotected_page(vcpu->kvm, gfn)) { |
1589 | ret = 1; | |
1590 | spte = shadow_trap_nonpresent_pte; | |
1591 | goto set_pte; | |
1592 | } | |
1593 | ||
1c4f1fd6 | 1594 | spte |= PT_WRITABLE_MASK; |
1c4f1fd6 | 1595 | |
4731d4c7 | 1596 | if (mmu_need_write_protect(vcpu, gfn, can_unsync)) { |
1c4f1fd6 | 1597 | pgprintk("%s: found shadow page for %lx, marking ro\n", |
b8688d51 | 1598 | __func__, gfn); |
1e73f9dd | 1599 | ret = 1; |
1c4f1fd6 | 1600 | pte_access &= ~ACC_WRITE_MASK; |
a378b4e6 | 1601 | if (is_writeble_pte(spte)) |
1c4f1fd6 | 1602 | spte &= ~PT_WRITABLE_MASK; |
1c4f1fd6 AK |
1603 | } |
1604 | } | |
1605 | ||
1c4f1fd6 AK |
1606 | if (pte_access & ACC_WRITE_MASK) |
1607 | mark_page_dirty(vcpu->kvm, gfn); | |
1608 | ||
38187c83 | 1609 | set_pte: |
1c4f1fd6 | 1610 | set_shadow_pte(shadow_pte, spte); |
1e73f9dd MT |
1611 | return ret; |
1612 | } | |
1613 | ||
1e73f9dd MT |
1614 | static void mmu_set_spte(struct kvm_vcpu *vcpu, u64 *shadow_pte, |
1615 | unsigned pt_access, unsigned pte_access, | |
1616 | int user_fault, int write_fault, int dirty, | |
1617 | int *ptwrite, int largepage, gfn_t gfn, | |
1618 | pfn_t pfn, bool speculative) | |
1619 | { | |
1620 | int was_rmapped = 0; | |
1621 | int was_writeble = is_writeble_pte(*shadow_pte); | |
1622 | ||
1623 | pgprintk("%s: spte %llx access %x write_fault %d" | |
1624 | " user_fault %d gfn %lx\n", | |
1625 | __func__, *shadow_pte, pt_access, | |
1626 | write_fault, user_fault, gfn); | |
1627 | ||
1628 | if (is_rmap_pte(*shadow_pte)) { | |
1629 | /* | |
1630 | * If we overwrite a PTE page pointer with a 2MB PMD, unlink | |
1631 | * the parent of the now unreachable PTE. | |
1632 | */ | |
1633 | if (largepage && !is_large_pte(*shadow_pte)) { | |
1634 | struct kvm_mmu_page *child; | |
1635 | u64 pte = *shadow_pte; | |
1636 | ||
1637 | child = page_header(pte & PT64_BASE_ADDR_MASK); | |
1638 | mmu_page_remove_parent_pte(child, shadow_pte); | |
1639 | } else if (pfn != spte_to_pfn(*shadow_pte)) { | |
1640 | pgprintk("hfn old %lx new %lx\n", | |
1641 | spte_to_pfn(*shadow_pte), pfn); | |
1642 | rmap_remove(vcpu->kvm, shadow_pte); | |
1643 | } else { | |
1644 | if (largepage) | |
1645 | was_rmapped = is_large_pte(*shadow_pte); | |
1646 | else | |
1647 | was_rmapped = 1; | |
1648 | } | |
1649 | } | |
1650 | if (set_spte(vcpu, shadow_pte, pte_access, user_fault, write_fault, | |
4731d4c7 | 1651 | dirty, largepage, gfn, pfn, speculative, true)) { |
1e73f9dd MT |
1652 | if (write_fault) |
1653 | *ptwrite = 1; | |
a378b4e6 MT |
1654 | kvm_x86_ops->tlb_flush(vcpu); |
1655 | } | |
1e73f9dd MT |
1656 | |
1657 | pgprintk("%s: setting spte %llx\n", __func__, *shadow_pte); | |
1658 | pgprintk("instantiating %s PTE (%s) at %ld (%llx) addr %p\n", | |
1659 | is_large_pte(*shadow_pte)? "2MB" : "4kB", | |
1660 | is_present_pte(*shadow_pte)?"RW":"R", gfn, | |
1661 | *shadow_pte, shadow_pte); | |
1662 | if (!was_rmapped && is_large_pte(*shadow_pte)) | |
05da4558 MT |
1663 | ++vcpu->kvm->stat.lpages; |
1664 | ||
1c4f1fd6 AK |
1665 | page_header_update_slot(vcpu->kvm, shadow_pte, gfn); |
1666 | if (!was_rmapped) { | |
05da4558 | 1667 | rmap_add(vcpu, shadow_pte, gfn, largepage); |
1c4f1fd6 | 1668 | if (!is_rmap_pte(*shadow_pte)) |
35149e21 | 1669 | kvm_release_pfn_clean(pfn); |
75e68e60 IE |
1670 | } else { |
1671 | if (was_writeble) | |
35149e21 | 1672 | kvm_release_pfn_dirty(pfn); |
75e68e60 | 1673 | else |
35149e21 | 1674 | kvm_release_pfn_clean(pfn); |
1c4f1fd6 | 1675 | } |
1b7fcd32 | 1676 | if (speculative) { |
ad312c7c | 1677 | vcpu->arch.last_pte_updated = shadow_pte; |
1b7fcd32 AK |
1678 | vcpu->arch.last_pte_gfn = gfn; |
1679 | } | |
1c4f1fd6 AK |
1680 | } |
1681 | ||
6aa8b732 AK |
1682 | static void nonpaging_new_cr3(struct kvm_vcpu *vcpu) |
1683 | { | |
1684 | } | |
1685 | ||
140754bc AK |
1686 | struct direct_shadow_walk { |
1687 | struct kvm_shadow_walk walker; | |
1688 | pfn_t pfn; | |
1689 | int write; | |
1690 | int largepage; | |
1691 | int pt_write; | |
1692 | }; | |
6aa8b732 | 1693 | |
140754bc AK |
1694 | static int direct_map_entry(struct kvm_shadow_walk *_walk, |
1695 | struct kvm_vcpu *vcpu, | |
d40a1ee4 | 1696 | u64 addr, u64 *sptep, int level) |
140754bc AK |
1697 | { |
1698 | struct direct_shadow_walk *walk = | |
1699 | container_of(_walk, struct direct_shadow_walk, walker); | |
1700 | struct kvm_mmu_page *sp; | |
1701 | gfn_t pseudo_gfn; | |
1702 | gfn_t gfn = addr >> PAGE_SHIFT; | |
1703 | ||
1704 | if (level == PT_PAGE_TABLE_LEVEL | |
1705 | || (walk->largepage && level == PT_DIRECTORY_LEVEL)) { | |
1706 | mmu_set_spte(vcpu, sptep, ACC_ALL, ACC_ALL, | |
1707 | 0, walk->write, 1, &walk->pt_write, | |
1708 | walk->largepage, gfn, walk->pfn, false); | |
bc2d4299 | 1709 | ++vcpu->stat.pf_fixed; |
140754bc AK |
1710 | return 1; |
1711 | } | |
6aa8b732 | 1712 | |
140754bc AK |
1713 | if (*sptep == shadow_trap_nonpresent_pte) { |
1714 | pseudo_gfn = (addr & PT64_DIR_BASE_ADDR_MASK) >> PAGE_SHIFT; | |
d40a1ee4 | 1715 | sp = kvm_mmu_get_page(vcpu, pseudo_gfn, (gva_t)addr, level - 1, |
140754bc AK |
1716 | 1, ACC_ALL, sptep); |
1717 | if (!sp) { | |
1718 | pgprintk("nonpaging_map: ENOMEM\n"); | |
1719 | kvm_release_pfn_clean(walk->pfn); | |
1720 | return -ENOMEM; | |
6aa8b732 AK |
1721 | } |
1722 | ||
140754bc AK |
1723 | set_shadow_pte(sptep, |
1724 | __pa(sp->spt) | |
1725 | | PT_PRESENT_MASK | PT_WRITABLE_MASK | |
1726 | | shadow_user_mask | shadow_x_mask); | |
6aa8b732 | 1727 | } |
140754bc AK |
1728 | return 0; |
1729 | } | |
1730 | ||
1731 | static int __direct_map(struct kvm_vcpu *vcpu, gpa_t v, int write, | |
1732 | int largepage, gfn_t gfn, pfn_t pfn) | |
1733 | { | |
1734 | int r; | |
1735 | struct direct_shadow_walk walker = { | |
1736 | .walker = { .entry = direct_map_entry, }, | |
1737 | .pfn = pfn, | |
1738 | .largepage = largepage, | |
1739 | .write = write, | |
1740 | .pt_write = 0, | |
1741 | }; | |
1742 | ||
d40a1ee4 | 1743 | r = walk_shadow(&walker.walker, vcpu, gfn << PAGE_SHIFT); |
140754bc AK |
1744 | if (r < 0) |
1745 | return r; | |
1746 | return walker.pt_write; | |
6aa8b732 AK |
1747 | } |
1748 | ||
10589a46 MT |
1749 | static int nonpaging_map(struct kvm_vcpu *vcpu, gva_t v, int write, gfn_t gfn) |
1750 | { | |
1751 | int r; | |
05da4558 | 1752 | int largepage = 0; |
35149e21 | 1753 | pfn_t pfn; |
e930bffe | 1754 | unsigned long mmu_seq; |
aaee2c94 | 1755 | |
05da4558 MT |
1756 | if (is_largepage_backed(vcpu, gfn & ~(KVM_PAGES_PER_HPAGE-1))) { |
1757 | gfn &= ~(KVM_PAGES_PER_HPAGE-1); | |
1758 | largepage = 1; | |
1759 | } | |
1760 | ||
e930bffe | 1761 | mmu_seq = vcpu->kvm->mmu_notifier_seq; |
4c2155ce | 1762 | smp_rmb(); |
35149e21 | 1763 | pfn = gfn_to_pfn(vcpu->kvm, gfn); |
aaee2c94 | 1764 | |
d196e343 | 1765 | /* mmio */ |
35149e21 AL |
1766 | if (is_error_pfn(pfn)) { |
1767 | kvm_release_pfn_clean(pfn); | |
d196e343 AK |
1768 | return 1; |
1769 | } | |
1770 | ||
aaee2c94 | 1771 | spin_lock(&vcpu->kvm->mmu_lock); |
e930bffe AA |
1772 | if (mmu_notifier_retry(vcpu, mmu_seq)) |
1773 | goto out_unlock; | |
eb787d10 | 1774 | kvm_mmu_free_some_pages(vcpu); |
6c41f428 | 1775 | r = __direct_map(vcpu, v, write, largepage, gfn, pfn); |
aaee2c94 MT |
1776 | spin_unlock(&vcpu->kvm->mmu_lock); |
1777 | ||
aaee2c94 | 1778 | |
10589a46 | 1779 | return r; |
e930bffe AA |
1780 | |
1781 | out_unlock: | |
1782 | spin_unlock(&vcpu->kvm->mmu_lock); | |
1783 | kvm_release_pfn_clean(pfn); | |
1784 | return 0; | |
10589a46 MT |
1785 | } |
1786 | ||
1787 | ||
17ac10ad AK |
1788 | static void mmu_free_roots(struct kvm_vcpu *vcpu) |
1789 | { | |
1790 | int i; | |
4db35314 | 1791 | struct kvm_mmu_page *sp; |
17ac10ad | 1792 | |
ad312c7c | 1793 | if (!VALID_PAGE(vcpu->arch.mmu.root_hpa)) |
7b53aa56 | 1794 | return; |
aaee2c94 | 1795 | spin_lock(&vcpu->kvm->mmu_lock); |
ad312c7c ZX |
1796 | if (vcpu->arch.mmu.shadow_root_level == PT64_ROOT_LEVEL) { |
1797 | hpa_t root = vcpu->arch.mmu.root_hpa; | |
17ac10ad | 1798 | |
4db35314 AK |
1799 | sp = page_header(root); |
1800 | --sp->root_count; | |
2e53d63a MT |
1801 | if (!sp->root_count && sp->role.invalid) |
1802 | kvm_mmu_zap_page(vcpu->kvm, sp); | |
ad312c7c | 1803 | vcpu->arch.mmu.root_hpa = INVALID_PAGE; |
aaee2c94 | 1804 | spin_unlock(&vcpu->kvm->mmu_lock); |
17ac10ad AK |
1805 | return; |
1806 | } | |
17ac10ad | 1807 | for (i = 0; i < 4; ++i) { |
ad312c7c | 1808 | hpa_t root = vcpu->arch.mmu.pae_root[i]; |
17ac10ad | 1809 | |
417726a3 | 1810 | if (root) { |
417726a3 | 1811 | root &= PT64_BASE_ADDR_MASK; |
4db35314 AK |
1812 | sp = page_header(root); |
1813 | --sp->root_count; | |
2e53d63a MT |
1814 | if (!sp->root_count && sp->role.invalid) |
1815 | kvm_mmu_zap_page(vcpu->kvm, sp); | |
417726a3 | 1816 | } |
ad312c7c | 1817 | vcpu->arch.mmu.pae_root[i] = INVALID_PAGE; |
17ac10ad | 1818 | } |
aaee2c94 | 1819 | spin_unlock(&vcpu->kvm->mmu_lock); |
ad312c7c | 1820 | vcpu->arch.mmu.root_hpa = INVALID_PAGE; |
17ac10ad AK |
1821 | } |
1822 | ||
1823 | static void mmu_alloc_roots(struct kvm_vcpu *vcpu) | |
1824 | { | |
1825 | int i; | |
cea0f0e7 | 1826 | gfn_t root_gfn; |
4db35314 | 1827 | struct kvm_mmu_page *sp; |
fb72d167 | 1828 | int metaphysical = 0; |
3bb65a22 | 1829 | |
ad312c7c | 1830 | root_gfn = vcpu->arch.cr3 >> PAGE_SHIFT; |
17ac10ad | 1831 | |
ad312c7c ZX |
1832 | if (vcpu->arch.mmu.shadow_root_level == PT64_ROOT_LEVEL) { |
1833 | hpa_t root = vcpu->arch.mmu.root_hpa; | |
17ac10ad AK |
1834 | |
1835 | ASSERT(!VALID_PAGE(root)); | |
fb72d167 JR |
1836 | if (tdp_enabled) |
1837 | metaphysical = 1; | |
4db35314 | 1838 | sp = kvm_mmu_get_page(vcpu, root_gfn, 0, |
fb72d167 JR |
1839 | PT64_ROOT_LEVEL, metaphysical, |
1840 | ACC_ALL, NULL); | |
4db35314 AK |
1841 | root = __pa(sp->spt); |
1842 | ++sp->root_count; | |
ad312c7c | 1843 | vcpu->arch.mmu.root_hpa = root; |
17ac10ad AK |
1844 | return; |
1845 | } | |
fb72d167 JR |
1846 | metaphysical = !is_paging(vcpu); |
1847 | if (tdp_enabled) | |
1848 | metaphysical = 1; | |
17ac10ad | 1849 | for (i = 0; i < 4; ++i) { |
ad312c7c | 1850 | hpa_t root = vcpu->arch.mmu.pae_root[i]; |
17ac10ad AK |
1851 | |
1852 | ASSERT(!VALID_PAGE(root)); | |
ad312c7c ZX |
1853 | if (vcpu->arch.mmu.root_level == PT32E_ROOT_LEVEL) { |
1854 | if (!is_present_pte(vcpu->arch.pdptrs[i])) { | |
1855 | vcpu->arch.mmu.pae_root[i] = 0; | |
417726a3 AK |
1856 | continue; |
1857 | } | |
ad312c7c ZX |
1858 | root_gfn = vcpu->arch.pdptrs[i] >> PAGE_SHIFT; |
1859 | } else if (vcpu->arch.mmu.root_level == 0) | |
cea0f0e7 | 1860 | root_gfn = 0; |
4db35314 | 1861 | sp = kvm_mmu_get_page(vcpu, root_gfn, i << 30, |
fb72d167 | 1862 | PT32_ROOT_LEVEL, metaphysical, |
f7d9c7b7 | 1863 | ACC_ALL, NULL); |
4db35314 AK |
1864 | root = __pa(sp->spt); |
1865 | ++sp->root_count; | |
ad312c7c | 1866 | vcpu->arch.mmu.pae_root[i] = root | PT_PRESENT_MASK; |
17ac10ad | 1867 | } |
ad312c7c | 1868 | vcpu->arch.mmu.root_hpa = __pa(vcpu->arch.mmu.pae_root); |
17ac10ad AK |
1869 | } |
1870 | ||
0ba73cda MT |
1871 | static void mmu_sync_roots(struct kvm_vcpu *vcpu) |
1872 | { | |
1873 | int i; | |
1874 | struct kvm_mmu_page *sp; | |
1875 | ||
1876 | if (!VALID_PAGE(vcpu->arch.mmu.root_hpa)) | |
1877 | return; | |
1878 | if (vcpu->arch.mmu.shadow_root_level == PT64_ROOT_LEVEL) { | |
1879 | hpa_t root = vcpu->arch.mmu.root_hpa; | |
1880 | sp = page_header(root); | |
1881 | mmu_sync_children(vcpu, sp); | |
1882 | return; | |
1883 | } | |
1884 | for (i = 0; i < 4; ++i) { | |
1885 | hpa_t root = vcpu->arch.mmu.pae_root[i]; | |
1886 | ||
1887 | if (root) { | |
1888 | root &= PT64_BASE_ADDR_MASK; | |
1889 | sp = page_header(root); | |
1890 | mmu_sync_children(vcpu, sp); | |
1891 | } | |
1892 | } | |
1893 | } | |
1894 | ||
1895 | void kvm_mmu_sync_roots(struct kvm_vcpu *vcpu) | |
1896 | { | |
1897 | spin_lock(&vcpu->kvm->mmu_lock); | |
1898 | mmu_sync_roots(vcpu); | |
1899 | spin_unlock(&vcpu->kvm->mmu_lock); | |
1900 | } | |
1901 | ||
6aa8b732 AK |
1902 | static gpa_t nonpaging_gva_to_gpa(struct kvm_vcpu *vcpu, gva_t vaddr) |
1903 | { | |
1904 | return vaddr; | |
1905 | } | |
1906 | ||
1907 | static int nonpaging_page_fault(struct kvm_vcpu *vcpu, gva_t gva, | |
3f3e7124 | 1908 | u32 error_code) |
6aa8b732 | 1909 | { |
e833240f | 1910 | gfn_t gfn; |
e2dec939 | 1911 | int r; |
6aa8b732 | 1912 | |
b8688d51 | 1913 | pgprintk("%s: gva %lx error %x\n", __func__, gva, error_code); |
e2dec939 AK |
1914 | r = mmu_topup_memory_caches(vcpu); |
1915 | if (r) | |
1916 | return r; | |
714b93da | 1917 | |
6aa8b732 | 1918 | ASSERT(vcpu); |
ad312c7c | 1919 | ASSERT(VALID_PAGE(vcpu->arch.mmu.root_hpa)); |
6aa8b732 | 1920 | |
e833240f | 1921 | gfn = gva >> PAGE_SHIFT; |
6aa8b732 | 1922 | |
e833240f AK |
1923 | return nonpaging_map(vcpu, gva & PAGE_MASK, |
1924 | error_code & PFERR_WRITE_MASK, gfn); | |
6aa8b732 AK |
1925 | } |
1926 | ||
fb72d167 JR |
1927 | static int tdp_page_fault(struct kvm_vcpu *vcpu, gva_t gpa, |
1928 | u32 error_code) | |
1929 | { | |
35149e21 | 1930 | pfn_t pfn; |
fb72d167 | 1931 | int r; |
05da4558 MT |
1932 | int largepage = 0; |
1933 | gfn_t gfn = gpa >> PAGE_SHIFT; | |
e930bffe | 1934 | unsigned long mmu_seq; |
fb72d167 JR |
1935 | |
1936 | ASSERT(vcpu); | |
1937 | ASSERT(VALID_PAGE(vcpu->arch.mmu.root_hpa)); | |
1938 | ||
1939 | r = mmu_topup_memory_caches(vcpu); | |
1940 | if (r) | |
1941 | return r; | |
1942 | ||
05da4558 MT |
1943 | if (is_largepage_backed(vcpu, gfn & ~(KVM_PAGES_PER_HPAGE-1))) { |
1944 | gfn &= ~(KVM_PAGES_PER_HPAGE-1); | |
1945 | largepage = 1; | |
1946 | } | |
e930bffe | 1947 | mmu_seq = vcpu->kvm->mmu_notifier_seq; |
4c2155ce | 1948 | smp_rmb(); |
35149e21 | 1949 | pfn = gfn_to_pfn(vcpu->kvm, gfn); |
35149e21 AL |
1950 | if (is_error_pfn(pfn)) { |
1951 | kvm_release_pfn_clean(pfn); | |
fb72d167 JR |
1952 | return 1; |
1953 | } | |
1954 | spin_lock(&vcpu->kvm->mmu_lock); | |
e930bffe AA |
1955 | if (mmu_notifier_retry(vcpu, mmu_seq)) |
1956 | goto out_unlock; | |
fb72d167 JR |
1957 | kvm_mmu_free_some_pages(vcpu); |
1958 | r = __direct_map(vcpu, gpa, error_code & PFERR_WRITE_MASK, | |
6c41f428 | 1959 | largepage, gfn, pfn); |
fb72d167 | 1960 | spin_unlock(&vcpu->kvm->mmu_lock); |
fb72d167 JR |
1961 | |
1962 | return r; | |
e930bffe AA |
1963 | |
1964 | out_unlock: | |
1965 | spin_unlock(&vcpu->kvm->mmu_lock); | |
1966 | kvm_release_pfn_clean(pfn); | |
1967 | return 0; | |
fb72d167 JR |
1968 | } |
1969 | ||
6aa8b732 AK |
1970 | static void nonpaging_free(struct kvm_vcpu *vcpu) |
1971 | { | |
17ac10ad | 1972 | mmu_free_roots(vcpu); |
6aa8b732 AK |
1973 | } |
1974 | ||
1975 | static int nonpaging_init_context(struct kvm_vcpu *vcpu) | |
1976 | { | |
ad312c7c | 1977 | struct kvm_mmu *context = &vcpu->arch.mmu; |
6aa8b732 AK |
1978 | |
1979 | context->new_cr3 = nonpaging_new_cr3; | |
1980 | context->page_fault = nonpaging_page_fault; | |
6aa8b732 AK |
1981 | context->gva_to_gpa = nonpaging_gva_to_gpa; |
1982 | context->free = nonpaging_free; | |
c7addb90 | 1983 | context->prefetch_page = nonpaging_prefetch_page; |
e8bc217a | 1984 | context->sync_page = nonpaging_sync_page; |
a7052897 | 1985 | context->invlpg = nonpaging_invlpg; |
cea0f0e7 | 1986 | context->root_level = 0; |
6aa8b732 | 1987 | context->shadow_root_level = PT32E_ROOT_LEVEL; |
17c3ba9d | 1988 | context->root_hpa = INVALID_PAGE; |
6aa8b732 AK |
1989 | return 0; |
1990 | } | |
1991 | ||
d835dfec | 1992 | void kvm_mmu_flush_tlb(struct kvm_vcpu *vcpu) |
6aa8b732 | 1993 | { |
1165f5fe | 1994 | ++vcpu->stat.tlb_flush; |
cbdd1bea | 1995 | kvm_x86_ops->tlb_flush(vcpu); |
6aa8b732 AK |
1996 | } |
1997 | ||
1998 | static void paging_new_cr3(struct kvm_vcpu *vcpu) | |
1999 | { | |
b8688d51 | 2000 | pgprintk("%s: cr3 %lx\n", __func__, vcpu->arch.cr3); |
cea0f0e7 | 2001 | mmu_free_roots(vcpu); |
6aa8b732 AK |
2002 | } |
2003 | ||
6aa8b732 AK |
2004 | static void inject_page_fault(struct kvm_vcpu *vcpu, |
2005 | u64 addr, | |
2006 | u32 err_code) | |
2007 | { | |
c3c91fee | 2008 | kvm_inject_page_fault(vcpu, addr, err_code); |
6aa8b732 AK |
2009 | } |
2010 | ||
6aa8b732 AK |
2011 | static void paging_free(struct kvm_vcpu *vcpu) |
2012 | { | |
2013 | nonpaging_free(vcpu); | |
2014 | } | |
2015 | ||
2016 | #define PTTYPE 64 | |
2017 | #include "paging_tmpl.h" | |
2018 | #undef PTTYPE | |
2019 | ||
2020 | #define PTTYPE 32 | |
2021 | #include "paging_tmpl.h" | |
2022 | #undef PTTYPE | |
2023 | ||
17ac10ad | 2024 | static int paging64_init_context_common(struct kvm_vcpu *vcpu, int level) |
6aa8b732 | 2025 | { |
ad312c7c | 2026 | struct kvm_mmu *context = &vcpu->arch.mmu; |
6aa8b732 AK |
2027 | |
2028 | ASSERT(is_pae(vcpu)); | |
2029 | context->new_cr3 = paging_new_cr3; | |
2030 | context->page_fault = paging64_page_fault; | |
6aa8b732 | 2031 | context->gva_to_gpa = paging64_gva_to_gpa; |
c7addb90 | 2032 | context->prefetch_page = paging64_prefetch_page; |
e8bc217a | 2033 | context->sync_page = paging64_sync_page; |
a7052897 | 2034 | context->invlpg = paging64_invlpg; |
6aa8b732 | 2035 | context->free = paging_free; |
17ac10ad AK |
2036 | context->root_level = level; |
2037 | context->shadow_root_level = level; | |
17c3ba9d | 2038 | context->root_hpa = INVALID_PAGE; |
6aa8b732 AK |
2039 | return 0; |
2040 | } | |
2041 | ||
17ac10ad AK |
2042 | static int paging64_init_context(struct kvm_vcpu *vcpu) |
2043 | { | |
2044 | return paging64_init_context_common(vcpu, PT64_ROOT_LEVEL); | |
2045 | } | |
2046 | ||
6aa8b732 AK |
2047 | static int paging32_init_context(struct kvm_vcpu *vcpu) |
2048 | { | |
ad312c7c | 2049 | struct kvm_mmu *context = &vcpu->arch.mmu; |
6aa8b732 AK |
2050 | |
2051 | context->new_cr3 = paging_new_cr3; | |
2052 | context->page_fault = paging32_page_fault; | |
6aa8b732 AK |
2053 | context->gva_to_gpa = paging32_gva_to_gpa; |
2054 | context->free = paging_free; | |
c7addb90 | 2055 | context->prefetch_page = paging32_prefetch_page; |
e8bc217a | 2056 | context->sync_page = paging32_sync_page; |
a7052897 | 2057 | context->invlpg = paging32_invlpg; |
6aa8b732 AK |
2058 | context->root_level = PT32_ROOT_LEVEL; |
2059 | context->shadow_root_level = PT32E_ROOT_LEVEL; | |
17c3ba9d | 2060 | context->root_hpa = INVALID_PAGE; |
6aa8b732 AK |
2061 | return 0; |
2062 | } | |
2063 | ||
2064 | static int paging32E_init_context(struct kvm_vcpu *vcpu) | |
2065 | { | |
17ac10ad | 2066 | return paging64_init_context_common(vcpu, PT32E_ROOT_LEVEL); |
6aa8b732 AK |
2067 | } |
2068 | ||
fb72d167 JR |
2069 | static int init_kvm_tdp_mmu(struct kvm_vcpu *vcpu) |
2070 | { | |
2071 | struct kvm_mmu *context = &vcpu->arch.mmu; | |
2072 | ||
2073 | context->new_cr3 = nonpaging_new_cr3; | |
2074 | context->page_fault = tdp_page_fault; | |
2075 | context->free = nonpaging_free; | |
2076 | context->prefetch_page = nonpaging_prefetch_page; | |
e8bc217a | 2077 | context->sync_page = nonpaging_sync_page; |
a7052897 | 2078 | context->invlpg = nonpaging_invlpg; |
67253af5 | 2079 | context->shadow_root_level = kvm_x86_ops->get_tdp_level(); |
fb72d167 JR |
2080 | context->root_hpa = INVALID_PAGE; |
2081 | ||
2082 | if (!is_paging(vcpu)) { | |
2083 | context->gva_to_gpa = nonpaging_gva_to_gpa; | |
2084 | context->root_level = 0; | |
2085 | } else if (is_long_mode(vcpu)) { | |
2086 | context->gva_to_gpa = paging64_gva_to_gpa; | |
2087 | context->root_level = PT64_ROOT_LEVEL; | |
2088 | } else if (is_pae(vcpu)) { | |
2089 | context->gva_to_gpa = paging64_gva_to_gpa; | |
2090 | context->root_level = PT32E_ROOT_LEVEL; | |
2091 | } else { | |
2092 | context->gva_to_gpa = paging32_gva_to_gpa; | |
2093 | context->root_level = PT32_ROOT_LEVEL; | |
2094 | } | |
2095 | ||
2096 | return 0; | |
2097 | } | |
2098 | ||
2099 | static int init_kvm_softmmu(struct kvm_vcpu *vcpu) | |
6aa8b732 AK |
2100 | { |
2101 | ASSERT(vcpu); | |
ad312c7c | 2102 | ASSERT(!VALID_PAGE(vcpu->arch.mmu.root_hpa)); |
6aa8b732 AK |
2103 | |
2104 | if (!is_paging(vcpu)) | |
2105 | return nonpaging_init_context(vcpu); | |
a9058ecd | 2106 | else if (is_long_mode(vcpu)) |
6aa8b732 AK |
2107 | return paging64_init_context(vcpu); |
2108 | else if (is_pae(vcpu)) | |
2109 | return paging32E_init_context(vcpu); | |
2110 | else | |
2111 | return paging32_init_context(vcpu); | |
2112 | } | |
2113 | ||
fb72d167 JR |
2114 | static int init_kvm_mmu(struct kvm_vcpu *vcpu) |
2115 | { | |
35149e21 AL |
2116 | vcpu->arch.update_pte.pfn = bad_pfn; |
2117 | ||
fb72d167 JR |
2118 | if (tdp_enabled) |
2119 | return init_kvm_tdp_mmu(vcpu); | |
2120 | else | |
2121 | return init_kvm_softmmu(vcpu); | |
2122 | } | |
2123 | ||
6aa8b732 AK |
2124 | static void destroy_kvm_mmu(struct kvm_vcpu *vcpu) |
2125 | { | |
2126 | ASSERT(vcpu); | |
ad312c7c ZX |
2127 | if (VALID_PAGE(vcpu->arch.mmu.root_hpa)) { |
2128 | vcpu->arch.mmu.free(vcpu); | |
2129 | vcpu->arch.mmu.root_hpa = INVALID_PAGE; | |
6aa8b732 AK |
2130 | } |
2131 | } | |
2132 | ||
2133 | int kvm_mmu_reset_context(struct kvm_vcpu *vcpu) | |
17c3ba9d AK |
2134 | { |
2135 | destroy_kvm_mmu(vcpu); | |
2136 | return init_kvm_mmu(vcpu); | |
2137 | } | |
8668a3c4 | 2138 | EXPORT_SYMBOL_GPL(kvm_mmu_reset_context); |
17c3ba9d AK |
2139 | |
2140 | int kvm_mmu_load(struct kvm_vcpu *vcpu) | |
6aa8b732 | 2141 | { |
714b93da AK |
2142 | int r; |
2143 | ||
e2dec939 | 2144 | r = mmu_topup_memory_caches(vcpu); |
17c3ba9d AK |
2145 | if (r) |
2146 | goto out; | |
aaee2c94 | 2147 | spin_lock(&vcpu->kvm->mmu_lock); |
eb787d10 | 2148 | kvm_mmu_free_some_pages(vcpu); |
17c3ba9d | 2149 | mmu_alloc_roots(vcpu); |
0ba73cda | 2150 | mmu_sync_roots(vcpu); |
aaee2c94 | 2151 | spin_unlock(&vcpu->kvm->mmu_lock); |
ad312c7c | 2152 | kvm_x86_ops->set_cr3(vcpu, vcpu->arch.mmu.root_hpa); |
17c3ba9d | 2153 | kvm_mmu_flush_tlb(vcpu); |
714b93da AK |
2154 | out: |
2155 | return r; | |
6aa8b732 | 2156 | } |
17c3ba9d AK |
2157 | EXPORT_SYMBOL_GPL(kvm_mmu_load); |
2158 | ||
2159 | void kvm_mmu_unload(struct kvm_vcpu *vcpu) | |
2160 | { | |
2161 | mmu_free_roots(vcpu); | |
2162 | } | |
6aa8b732 | 2163 | |
09072daf | 2164 | static void mmu_pte_write_zap_pte(struct kvm_vcpu *vcpu, |
4db35314 | 2165 | struct kvm_mmu_page *sp, |
ac1b714e AK |
2166 | u64 *spte) |
2167 | { | |
2168 | u64 pte; | |
2169 | struct kvm_mmu_page *child; | |
2170 | ||
2171 | pte = *spte; | |
c7addb90 | 2172 | if (is_shadow_present_pte(pte)) { |
05da4558 MT |
2173 | if (sp->role.level == PT_PAGE_TABLE_LEVEL || |
2174 | is_large_pte(pte)) | |
290fc38d | 2175 | rmap_remove(vcpu->kvm, spte); |
ac1b714e AK |
2176 | else { |
2177 | child = page_header(pte & PT64_BASE_ADDR_MASK); | |
90cb0529 | 2178 | mmu_page_remove_parent_pte(child, spte); |
ac1b714e AK |
2179 | } |
2180 | } | |
c7addb90 | 2181 | set_shadow_pte(spte, shadow_trap_nonpresent_pte); |
05da4558 MT |
2182 | if (is_large_pte(pte)) |
2183 | --vcpu->kvm->stat.lpages; | |
ac1b714e AK |
2184 | } |
2185 | ||
0028425f | 2186 | static void mmu_pte_write_new_pte(struct kvm_vcpu *vcpu, |
4db35314 | 2187 | struct kvm_mmu_page *sp, |
0028425f | 2188 | u64 *spte, |
489f1d65 | 2189 | const void *new) |
0028425f | 2190 | { |
30945387 MT |
2191 | if (sp->role.level != PT_PAGE_TABLE_LEVEL) { |
2192 | if (!vcpu->arch.update_pte.largepage || | |
2193 | sp->role.glevels == PT32_ROOT_LEVEL) { | |
2194 | ++vcpu->kvm->stat.mmu_pde_zapped; | |
2195 | return; | |
2196 | } | |
2197 | } | |
0028425f | 2198 | |
4cee5764 | 2199 | ++vcpu->kvm->stat.mmu_pte_updated; |
4db35314 | 2200 | if (sp->role.glevels == PT32_ROOT_LEVEL) |
489f1d65 | 2201 | paging32_update_pte(vcpu, sp, spte, new); |
0028425f | 2202 | else |
489f1d65 | 2203 | paging64_update_pte(vcpu, sp, spte, new); |
0028425f AK |
2204 | } |
2205 | ||
79539cec AK |
2206 | static bool need_remote_flush(u64 old, u64 new) |
2207 | { | |
2208 | if (!is_shadow_present_pte(old)) | |
2209 | return false; | |
2210 | if (!is_shadow_present_pte(new)) | |
2211 | return true; | |
2212 | if ((old ^ new) & PT64_BASE_ADDR_MASK) | |
2213 | return true; | |
2214 | old ^= PT64_NX_MASK; | |
2215 | new ^= PT64_NX_MASK; | |
2216 | return (old & ~new & PT64_PERM_MASK) != 0; | |
2217 | } | |
2218 | ||
2219 | static void mmu_pte_write_flush_tlb(struct kvm_vcpu *vcpu, u64 old, u64 new) | |
2220 | { | |
2221 | if (need_remote_flush(old, new)) | |
2222 | kvm_flush_remote_tlbs(vcpu->kvm); | |
2223 | else | |
2224 | kvm_mmu_flush_tlb(vcpu); | |
2225 | } | |
2226 | ||
12b7d28f AK |
2227 | static bool last_updated_pte_accessed(struct kvm_vcpu *vcpu) |
2228 | { | |
ad312c7c | 2229 | u64 *spte = vcpu->arch.last_pte_updated; |
12b7d28f | 2230 | |
7b52345e | 2231 | return !!(spte && (*spte & shadow_accessed_mask)); |
12b7d28f AK |
2232 | } |
2233 | ||
d7824fff AK |
2234 | static void mmu_guess_page_from_pte_write(struct kvm_vcpu *vcpu, gpa_t gpa, |
2235 | const u8 *new, int bytes) | |
2236 | { | |
2237 | gfn_t gfn; | |
2238 | int r; | |
2239 | u64 gpte = 0; | |
35149e21 | 2240 | pfn_t pfn; |
d7824fff | 2241 | |
05da4558 MT |
2242 | vcpu->arch.update_pte.largepage = 0; |
2243 | ||
d7824fff AK |
2244 | if (bytes != 4 && bytes != 8) |
2245 | return; | |
2246 | ||
2247 | /* | |
2248 | * Assume that the pte write on a page table of the same type | |
2249 | * as the current vcpu paging mode. This is nearly always true | |
2250 | * (might be false while changing modes). Note it is verified later | |
2251 | * by update_pte(). | |
2252 | */ | |
2253 | if (is_pae(vcpu)) { | |
2254 | /* Handle a 32-bit guest writing two halves of a 64-bit gpte */ | |
2255 | if ((bytes == 4) && (gpa % 4 == 0)) { | |
2256 | r = kvm_read_guest(vcpu->kvm, gpa & ~(u64)7, &gpte, 8); | |
2257 | if (r) | |
2258 | return; | |
2259 | memcpy((void *)&gpte + (gpa % 8), new, 4); | |
2260 | } else if ((bytes == 8) && (gpa % 8 == 0)) { | |
2261 | memcpy((void *)&gpte, new, 8); | |
2262 | } | |
2263 | } else { | |
2264 | if ((bytes == 4) && (gpa % 4 == 0)) | |
2265 | memcpy((void *)&gpte, new, 4); | |
2266 | } | |
2267 | if (!is_present_pte(gpte)) | |
2268 | return; | |
2269 | gfn = (gpte & PT64_BASE_ADDR_MASK) >> PAGE_SHIFT; | |
72dc67a6 | 2270 | |
05da4558 MT |
2271 | if (is_large_pte(gpte) && is_largepage_backed(vcpu, gfn)) { |
2272 | gfn &= ~(KVM_PAGES_PER_HPAGE-1); | |
2273 | vcpu->arch.update_pte.largepage = 1; | |
2274 | } | |
e930bffe | 2275 | vcpu->arch.update_pte.mmu_seq = vcpu->kvm->mmu_notifier_seq; |
4c2155ce | 2276 | smp_rmb(); |
35149e21 | 2277 | pfn = gfn_to_pfn(vcpu->kvm, gfn); |
72dc67a6 | 2278 | |
35149e21 AL |
2279 | if (is_error_pfn(pfn)) { |
2280 | kvm_release_pfn_clean(pfn); | |
d196e343 AK |
2281 | return; |
2282 | } | |
d7824fff | 2283 | vcpu->arch.update_pte.gfn = gfn; |
35149e21 | 2284 | vcpu->arch.update_pte.pfn = pfn; |
d7824fff AK |
2285 | } |
2286 | ||
1b7fcd32 AK |
2287 | static void kvm_mmu_access_page(struct kvm_vcpu *vcpu, gfn_t gfn) |
2288 | { | |
2289 | u64 *spte = vcpu->arch.last_pte_updated; | |
2290 | ||
2291 | if (spte | |
2292 | && vcpu->arch.last_pte_gfn == gfn | |
2293 | && shadow_accessed_mask | |
2294 | && !(*spte & shadow_accessed_mask) | |
2295 | && is_shadow_present_pte(*spte)) | |
2296 | set_bit(PT_ACCESSED_SHIFT, (unsigned long *)spte); | |
2297 | } | |
2298 | ||
09072daf | 2299 | void kvm_mmu_pte_write(struct kvm_vcpu *vcpu, gpa_t gpa, |
fe551881 | 2300 | const u8 *new, int bytes) |
da4a00f0 | 2301 | { |
9b7a0325 | 2302 | gfn_t gfn = gpa >> PAGE_SHIFT; |
4db35314 | 2303 | struct kvm_mmu_page *sp; |
0e7bc4b9 | 2304 | struct hlist_node *node, *n; |
9b7a0325 AK |
2305 | struct hlist_head *bucket; |
2306 | unsigned index; | |
489f1d65 | 2307 | u64 entry, gentry; |
9b7a0325 | 2308 | u64 *spte; |
9b7a0325 | 2309 | unsigned offset = offset_in_page(gpa); |
0e7bc4b9 | 2310 | unsigned pte_size; |
9b7a0325 | 2311 | unsigned page_offset; |
0e7bc4b9 | 2312 | unsigned misaligned; |
fce0657f | 2313 | unsigned quadrant; |
9b7a0325 | 2314 | int level; |
86a5ba02 | 2315 | int flooded = 0; |
ac1b714e | 2316 | int npte; |
489f1d65 | 2317 | int r; |
9b7a0325 | 2318 | |
b8688d51 | 2319 | pgprintk("%s: gpa %llx bytes %d\n", __func__, gpa, bytes); |
d7824fff | 2320 | mmu_guess_page_from_pte_write(vcpu, gpa, new, bytes); |
aaee2c94 | 2321 | spin_lock(&vcpu->kvm->mmu_lock); |
1b7fcd32 | 2322 | kvm_mmu_access_page(vcpu, gfn); |
eb787d10 | 2323 | kvm_mmu_free_some_pages(vcpu); |
4cee5764 | 2324 | ++vcpu->kvm->stat.mmu_pte_write; |
c7addb90 | 2325 | kvm_mmu_audit(vcpu, "pre pte write"); |
ad312c7c | 2326 | if (gfn == vcpu->arch.last_pt_write_gfn |
12b7d28f | 2327 | && !last_updated_pte_accessed(vcpu)) { |
ad312c7c ZX |
2328 | ++vcpu->arch.last_pt_write_count; |
2329 | if (vcpu->arch.last_pt_write_count >= 3) | |
86a5ba02 AK |
2330 | flooded = 1; |
2331 | } else { | |
ad312c7c ZX |
2332 | vcpu->arch.last_pt_write_gfn = gfn; |
2333 | vcpu->arch.last_pt_write_count = 1; | |
2334 | vcpu->arch.last_pte_updated = NULL; | |
86a5ba02 | 2335 | } |
1ae0a13d | 2336 | index = kvm_page_table_hashfn(gfn); |
f05e70ac | 2337 | bucket = &vcpu->kvm->arch.mmu_page_hash[index]; |
4db35314 | 2338 | hlist_for_each_entry_safe(sp, node, n, bucket, hash_link) { |
5b5c6a5a | 2339 | if (sp->gfn != gfn || sp->role.metaphysical || sp->role.invalid) |
9b7a0325 | 2340 | continue; |
4db35314 | 2341 | pte_size = sp->role.glevels == PT32_ROOT_LEVEL ? 4 : 8; |
0e7bc4b9 | 2342 | misaligned = (offset ^ (offset + bytes - 1)) & ~(pte_size - 1); |
e925c5ba | 2343 | misaligned |= bytes < 4; |
86a5ba02 | 2344 | if (misaligned || flooded) { |
0e7bc4b9 AK |
2345 | /* |
2346 | * Misaligned accesses are too much trouble to fix | |
2347 | * up; also, they usually indicate a page is not used | |
2348 | * as a page table. | |
86a5ba02 AK |
2349 | * |
2350 | * If we're seeing too many writes to a page, | |
2351 | * it may no longer be a page table, or we may be | |
2352 | * forking, in which case it is better to unmap the | |
2353 | * page. | |
0e7bc4b9 AK |
2354 | */ |
2355 | pgprintk("misaligned: gpa %llx bytes %d role %x\n", | |
4db35314 | 2356 | gpa, bytes, sp->role.word); |
07385413 MT |
2357 | if (kvm_mmu_zap_page(vcpu->kvm, sp)) |
2358 | n = bucket->first; | |
4cee5764 | 2359 | ++vcpu->kvm->stat.mmu_flooded; |
0e7bc4b9 AK |
2360 | continue; |
2361 | } | |
9b7a0325 | 2362 | page_offset = offset; |
4db35314 | 2363 | level = sp->role.level; |
ac1b714e | 2364 | npte = 1; |
4db35314 | 2365 | if (sp->role.glevels == PT32_ROOT_LEVEL) { |
ac1b714e AK |
2366 | page_offset <<= 1; /* 32->64 */ |
2367 | /* | |
2368 | * A 32-bit pde maps 4MB while the shadow pdes map | |
2369 | * only 2MB. So we need to double the offset again | |
2370 | * and zap two pdes instead of one. | |
2371 | */ | |
2372 | if (level == PT32_ROOT_LEVEL) { | |
6b8d0f9b | 2373 | page_offset &= ~7; /* kill rounding error */ |
ac1b714e AK |
2374 | page_offset <<= 1; |
2375 | npte = 2; | |
2376 | } | |
fce0657f | 2377 | quadrant = page_offset >> PAGE_SHIFT; |
9b7a0325 | 2378 | page_offset &= ~PAGE_MASK; |
4db35314 | 2379 | if (quadrant != sp->role.quadrant) |
fce0657f | 2380 | continue; |
9b7a0325 | 2381 | } |
4db35314 | 2382 | spte = &sp->spt[page_offset / sizeof(*spte)]; |
489f1d65 DE |
2383 | if ((gpa & (pte_size - 1)) || (bytes < pte_size)) { |
2384 | gentry = 0; | |
2385 | r = kvm_read_guest_atomic(vcpu->kvm, | |
2386 | gpa & ~(u64)(pte_size - 1), | |
2387 | &gentry, pte_size); | |
2388 | new = (const void *)&gentry; | |
2389 | if (r < 0) | |
2390 | new = NULL; | |
2391 | } | |
ac1b714e | 2392 | while (npte--) { |
79539cec | 2393 | entry = *spte; |
4db35314 | 2394 | mmu_pte_write_zap_pte(vcpu, sp, spte); |
489f1d65 DE |
2395 | if (new) |
2396 | mmu_pte_write_new_pte(vcpu, sp, spte, new); | |
79539cec | 2397 | mmu_pte_write_flush_tlb(vcpu, entry, *spte); |
ac1b714e | 2398 | ++spte; |
9b7a0325 | 2399 | } |
9b7a0325 | 2400 | } |
c7addb90 | 2401 | kvm_mmu_audit(vcpu, "post pte write"); |
aaee2c94 | 2402 | spin_unlock(&vcpu->kvm->mmu_lock); |
35149e21 AL |
2403 | if (!is_error_pfn(vcpu->arch.update_pte.pfn)) { |
2404 | kvm_release_pfn_clean(vcpu->arch.update_pte.pfn); | |
2405 | vcpu->arch.update_pte.pfn = bad_pfn; | |
d7824fff | 2406 | } |
da4a00f0 AK |
2407 | } |
2408 | ||
a436036b AK |
2409 | int kvm_mmu_unprotect_page_virt(struct kvm_vcpu *vcpu, gva_t gva) |
2410 | { | |
10589a46 MT |
2411 | gpa_t gpa; |
2412 | int r; | |
a436036b | 2413 | |
10589a46 | 2414 | gpa = vcpu->arch.mmu.gva_to_gpa(vcpu, gva); |
10589a46 | 2415 | |
aaee2c94 | 2416 | spin_lock(&vcpu->kvm->mmu_lock); |
10589a46 | 2417 | r = kvm_mmu_unprotect_page(vcpu->kvm, gpa >> PAGE_SHIFT); |
aaee2c94 | 2418 | spin_unlock(&vcpu->kvm->mmu_lock); |
10589a46 | 2419 | return r; |
a436036b | 2420 | } |
577bdc49 | 2421 | EXPORT_SYMBOL_GPL(kvm_mmu_unprotect_page_virt); |
a436036b | 2422 | |
22d95b12 | 2423 | void __kvm_mmu_free_some_pages(struct kvm_vcpu *vcpu) |
ebeace86 | 2424 | { |
f05e70ac | 2425 | while (vcpu->kvm->arch.n_free_mmu_pages < KVM_REFILL_PAGES) { |
4db35314 | 2426 | struct kvm_mmu_page *sp; |
ebeace86 | 2427 | |
f05e70ac | 2428 | sp = container_of(vcpu->kvm->arch.active_mmu_pages.prev, |
4db35314 AK |
2429 | struct kvm_mmu_page, link); |
2430 | kvm_mmu_zap_page(vcpu->kvm, sp); | |
4cee5764 | 2431 | ++vcpu->kvm->stat.mmu_recycled; |
ebeace86 AK |
2432 | } |
2433 | } | |
ebeace86 | 2434 | |
3067714c AK |
2435 | int kvm_mmu_page_fault(struct kvm_vcpu *vcpu, gva_t cr2, u32 error_code) |
2436 | { | |
2437 | int r; | |
2438 | enum emulation_result er; | |
2439 | ||
ad312c7c | 2440 | r = vcpu->arch.mmu.page_fault(vcpu, cr2, error_code); |
3067714c AK |
2441 | if (r < 0) |
2442 | goto out; | |
2443 | ||
2444 | if (!r) { | |
2445 | r = 1; | |
2446 | goto out; | |
2447 | } | |
2448 | ||
b733bfb5 AK |
2449 | r = mmu_topup_memory_caches(vcpu); |
2450 | if (r) | |
2451 | goto out; | |
2452 | ||
3067714c | 2453 | er = emulate_instruction(vcpu, vcpu->run, cr2, error_code, 0); |
3067714c AK |
2454 | |
2455 | switch (er) { | |
2456 | case EMULATE_DONE: | |
2457 | return 1; | |
2458 | case EMULATE_DO_MMIO: | |
2459 | ++vcpu->stat.mmio_exits; | |
2460 | return 0; | |
2461 | case EMULATE_FAIL: | |
2462 | kvm_report_emulation_failure(vcpu, "pagetable"); | |
2463 | return 1; | |
2464 | default: | |
2465 | BUG(); | |
2466 | } | |
2467 | out: | |
3067714c AK |
2468 | return r; |
2469 | } | |
2470 | EXPORT_SYMBOL_GPL(kvm_mmu_page_fault); | |
2471 | ||
a7052897 MT |
2472 | void kvm_mmu_invlpg(struct kvm_vcpu *vcpu, gva_t gva) |
2473 | { | |
2474 | spin_lock(&vcpu->kvm->mmu_lock); | |
2475 | vcpu->arch.mmu.invlpg(vcpu, gva); | |
2476 | spin_unlock(&vcpu->kvm->mmu_lock); | |
2477 | kvm_mmu_flush_tlb(vcpu); | |
2478 | ++vcpu->stat.invlpg; | |
2479 | } | |
2480 | EXPORT_SYMBOL_GPL(kvm_mmu_invlpg); | |
2481 | ||
18552672 JR |
2482 | void kvm_enable_tdp(void) |
2483 | { | |
2484 | tdp_enabled = true; | |
2485 | } | |
2486 | EXPORT_SYMBOL_GPL(kvm_enable_tdp); | |
2487 | ||
5f4cb662 JR |
2488 | void kvm_disable_tdp(void) |
2489 | { | |
2490 | tdp_enabled = false; | |
2491 | } | |
2492 | EXPORT_SYMBOL_GPL(kvm_disable_tdp); | |
2493 | ||
6aa8b732 AK |
2494 | static void free_mmu_pages(struct kvm_vcpu *vcpu) |
2495 | { | |
4db35314 | 2496 | struct kvm_mmu_page *sp; |
6aa8b732 | 2497 | |
f05e70ac ZX |
2498 | while (!list_empty(&vcpu->kvm->arch.active_mmu_pages)) { |
2499 | sp = container_of(vcpu->kvm->arch.active_mmu_pages.next, | |
4db35314 AK |
2500 | struct kvm_mmu_page, link); |
2501 | kvm_mmu_zap_page(vcpu->kvm, sp); | |
8d2d73b9 | 2502 | cond_resched(); |
f51234c2 | 2503 | } |
ad312c7c | 2504 | free_page((unsigned long)vcpu->arch.mmu.pae_root); |
6aa8b732 AK |
2505 | } |
2506 | ||
2507 | static int alloc_mmu_pages(struct kvm_vcpu *vcpu) | |
2508 | { | |
17ac10ad | 2509 | struct page *page; |
6aa8b732 AK |
2510 | int i; |
2511 | ||
2512 | ASSERT(vcpu); | |
2513 | ||
f05e70ac ZX |
2514 | if (vcpu->kvm->arch.n_requested_mmu_pages) |
2515 | vcpu->kvm->arch.n_free_mmu_pages = | |
2516 | vcpu->kvm->arch.n_requested_mmu_pages; | |
82ce2c96 | 2517 | else |
f05e70ac ZX |
2518 | vcpu->kvm->arch.n_free_mmu_pages = |
2519 | vcpu->kvm->arch.n_alloc_mmu_pages; | |
17ac10ad AK |
2520 | /* |
2521 | * When emulating 32-bit mode, cr3 is only 32 bits even on x86_64. | |
2522 | * Therefore we need to allocate shadow page tables in the first | |
2523 | * 4GB of memory, which happens to fit the DMA32 zone. | |
2524 | */ | |
2525 | page = alloc_page(GFP_KERNEL | __GFP_DMA32); | |
2526 | if (!page) | |
2527 | goto error_1; | |
ad312c7c | 2528 | vcpu->arch.mmu.pae_root = page_address(page); |
17ac10ad | 2529 | for (i = 0; i < 4; ++i) |
ad312c7c | 2530 | vcpu->arch.mmu.pae_root[i] = INVALID_PAGE; |
17ac10ad | 2531 | |
6aa8b732 AK |
2532 | return 0; |
2533 | ||
2534 | error_1: | |
2535 | free_mmu_pages(vcpu); | |
2536 | return -ENOMEM; | |
2537 | } | |
2538 | ||
8018c27b | 2539 | int kvm_mmu_create(struct kvm_vcpu *vcpu) |
6aa8b732 | 2540 | { |
6aa8b732 | 2541 | ASSERT(vcpu); |
ad312c7c | 2542 | ASSERT(!VALID_PAGE(vcpu->arch.mmu.root_hpa)); |
6aa8b732 | 2543 | |
8018c27b IM |
2544 | return alloc_mmu_pages(vcpu); |
2545 | } | |
6aa8b732 | 2546 | |
8018c27b IM |
2547 | int kvm_mmu_setup(struct kvm_vcpu *vcpu) |
2548 | { | |
2549 | ASSERT(vcpu); | |
ad312c7c | 2550 | ASSERT(!VALID_PAGE(vcpu->arch.mmu.root_hpa)); |
2c264957 | 2551 | |
8018c27b | 2552 | return init_kvm_mmu(vcpu); |
6aa8b732 AK |
2553 | } |
2554 | ||
2555 | void kvm_mmu_destroy(struct kvm_vcpu *vcpu) | |
2556 | { | |
2557 | ASSERT(vcpu); | |
2558 | ||
2559 | destroy_kvm_mmu(vcpu); | |
2560 | free_mmu_pages(vcpu); | |
714b93da | 2561 | mmu_free_memory_caches(vcpu); |
6aa8b732 AK |
2562 | } |
2563 | ||
90cb0529 | 2564 | void kvm_mmu_slot_remove_write_access(struct kvm *kvm, int slot) |
6aa8b732 | 2565 | { |
4db35314 | 2566 | struct kvm_mmu_page *sp; |
6aa8b732 | 2567 | |
2245a28f | 2568 | spin_lock(&kvm->mmu_lock); |
f05e70ac | 2569 | list_for_each_entry(sp, &kvm->arch.active_mmu_pages, link) { |
6aa8b732 AK |
2570 | int i; |
2571 | u64 *pt; | |
2572 | ||
291f26bc | 2573 | if (!test_bit(slot, sp->slot_bitmap)) |
6aa8b732 AK |
2574 | continue; |
2575 | ||
4db35314 | 2576 | pt = sp->spt; |
6aa8b732 AK |
2577 | for (i = 0; i < PT64_ENT_PER_PAGE; ++i) |
2578 | /* avoid RMW */ | |
9647c14c | 2579 | if (pt[i] & PT_WRITABLE_MASK) |
6aa8b732 | 2580 | pt[i] &= ~PT_WRITABLE_MASK; |
6aa8b732 | 2581 | } |
171d595d | 2582 | kvm_flush_remote_tlbs(kvm); |
2245a28f | 2583 | spin_unlock(&kvm->mmu_lock); |
6aa8b732 | 2584 | } |
37a7d8b0 | 2585 | |
90cb0529 | 2586 | void kvm_mmu_zap_all(struct kvm *kvm) |
e0fa826f | 2587 | { |
4db35314 | 2588 | struct kvm_mmu_page *sp, *node; |
e0fa826f | 2589 | |
aaee2c94 | 2590 | spin_lock(&kvm->mmu_lock); |
f05e70ac | 2591 | list_for_each_entry_safe(sp, node, &kvm->arch.active_mmu_pages, link) |
07385413 MT |
2592 | if (kvm_mmu_zap_page(kvm, sp)) |
2593 | node = container_of(kvm->arch.active_mmu_pages.next, | |
2594 | struct kvm_mmu_page, link); | |
aaee2c94 | 2595 | spin_unlock(&kvm->mmu_lock); |
e0fa826f | 2596 | |
90cb0529 | 2597 | kvm_flush_remote_tlbs(kvm); |
e0fa826f DL |
2598 | } |
2599 | ||
8b2cf73c | 2600 | static void kvm_mmu_remove_one_alloc_mmu_page(struct kvm *kvm) |
3ee16c81 IE |
2601 | { |
2602 | struct kvm_mmu_page *page; | |
2603 | ||
2604 | page = container_of(kvm->arch.active_mmu_pages.prev, | |
2605 | struct kvm_mmu_page, link); | |
2606 | kvm_mmu_zap_page(kvm, page); | |
2607 | } | |
2608 | ||
2609 | static int mmu_shrink(int nr_to_scan, gfp_t gfp_mask) | |
2610 | { | |
2611 | struct kvm *kvm; | |
2612 | struct kvm *kvm_freed = NULL; | |
2613 | int cache_count = 0; | |
2614 | ||
2615 | spin_lock(&kvm_lock); | |
2616 | ||
2617 | list_for_each_entry(kvm, &vm_list, vm_list) { | |
2618 | int npages; | |
2619 | ||
5a4c9288 MT |
2620 | if (!down_read_trylock(&kvm->slots_lock)) |
2621 | continue; | |
3ee16c81 IE |
2622 | spin_lock(&kvm->mmu_lock); |
2623 | npages = kvm->arch.n_alloc_mmu_pages - | |
2624 | kvm->arch.n_free_mmu_pages; | |
2625 | cache_count += npages; | |
2626 | if (!kvm_freed && nr_to_scan > 0 && npages > 0) { | |
2627 | kvm_mmu_remove_one_alloc_mmu_page(kvm); | |
2628 | cache_count--; | |
2629 | kvm_freed = kvm; | |
2630 | } | |
2631 | nr_to_scan--; | |
2632 | ||
2633 | spin_unlock(&kvm->mmu_lock); | |
5a4c9288 | 2634 | up_read(&kvm->slots_lock); |
3ee16c81 IE |
2635 | } |
2636 | if (kvm_freed) | |
2637 | list_move_tail(&kvm_freed->vm_list, &vm_list); | |
2638 | ||
2639 | spin_unlock(&kvm_lock); | |
2640 | ||
2641 | return cache_count; | |
2642 | } | |
2643 | ||
2644 | static struct shrinker mmu_shrinker = { | |
2645 | .shrink = mmu_shrink, | |
2646 | .seeks = DEFAULT_SEEKS * 10, | |
2647 | }; | |
2648 | ||
2ddfd20e | 2649 | static void mmu_destroy_caches(void) |
b5a33a75 AK |
2650 | { |
2651 | if (pte_chain_cache) | |
2652 | kmem_cache_destroy(pte_chain_cache); | |
2653 | if (rmap_desc_cache) | |
2654 | kmem_cache_destroy(rmap_desc_cache); | |
d3d25b04 AK |
2655 | if (mmu_page_header_cache) |
2656 | kmem_cache_destroy(mmu_page_header_cache); | |
b5a33a75 AK |
2657 | } |
2658 | ||
3ee16c81 IE |
2659 | void kvm_mmu_module_exit(void) |
2660 | { | |
2661 | mmu_destroy_caches(); | |
2662 | unregister_shrinker(&mmu_shrinker); | |
2663 | } | |
2664 | ||
b5a33a75 AK |
2665 | int kvm_mmu_module_init(void) |
2666 | { | |
2667 | pte_chain_cache = kmem_cache_create("kvm_pte_chain", | |
2668 | sizeof(struct kvm_pte_chain), | |
20c2df83 | 2669 | 0, 0, NULL); |
b5a33a75 AK |
2670 | if (!pte_chain_cache) |
2671 | goto nomem; | |
2672 | rmap_desc_cache = kmem_cache_create("kvm_rmap_desc", | |
2673 | sizeof(struct kvm_rmap_desc), | |
20c2df83 | 2674 | 0, 0, NULL); |
b5a33a75 AK |
2675 | if (!rmap_desc_cache) |
2676 | goto nomem; | |
2677 | ||
d3d25b04 AK |
2678 | mmu_page_header_cache = kmem_cache_create("kvm_mmu_page_header", |
2679 | sizeof(struct kvm_mmu_page), | |
20c2df83 | 2680 | 0, 0, NULL); |
d3d25b04 AK |
2681 | if (!mmu_page_header_cache) |
2682 | goto nomem; | |
2683 | ||
3ee16c81 IE |
2684 | register_shrinker(&mmu_shrinker); |
2685 | ||
b5a33a75 AK |
2686 | return 0; |
2687 | ||
2688 | nomem: | |
3ee16c81 | 2689 | mmu_destroy_caches(); |
b5a33a75 AK |
2690 | return -ENOMEM; |
2691 | } | |
2692 | ||
3ad82a7e ZX |
2693 | /* |
2694 | * Caculate mmu pages needed for kvm. | |
2695 | */ | |
2696 | unsigned int kvm_mmu_calculate_mmu_pages(struct kvm *kvm) | |
2697 | { | |
2698 | int i; | |
2699 | unsigned int nr_mmu_pages; | |
2700 | unsigned int nr_pages = 0; | |
2701 | ||
2702 | for (i = 0; i < kvm->nmemslots; i++) | |
2703 | nr_pages += kvm->memslots[i].npages; | |
2704 | ||
2705 | nr_mmu_pages = nr_pages * KVM_PERMILLE_MMU_PAGES / 1000; | |
2706 | nr_mmu_pages = max(nr_mmu_pages, | |
2707 | (unsigned int) KVM_MIN_ALLOC_MMU_PAGES); | |
2708 | ||
2709 | return nr_mmu_pages; | |
2710 | } | |
2711 | ||
2f333bcb MT |
2712 | static void *pv_mmu_peek_buffer(struct kvm_pv_mmu_op_buffer *buffer, |
2713 | unsigned len) | |
2714 | { | |
2715 | if (len > buffer->len) | |
2716 | return NULL; | |
2717 | return buffer->ptr; | |
2718 | } | |
2719 | ||
2720 | static void *pv_mmu_read_buffer(struct kvm_pv_mmu_op_buffer *buffer, | |
2721 | unsigned len) | |
2722 | { | |
2723 | void *ret; | |
2724 | ||
2725 | ret = pv_mmu_peek_buffer(buffer, len); | |
2726 | if (!ret) | |
2727 | return ret; | |
2728 | buffer->ptr += len; | |
2729 | buffer->len -= len; | |
2730 | buffer->processed += len; | |
2731 | return ret; | |
2732 | } | |
2733 | ||
2734 | static int kvm_pv_mmu_write(struct kvm_vcpu *vcpu, | |
2735 | gpa_t addr, gpa_t value) | |
2736 | { | |
2737 | int bytes = 8; | |
2738 | int r; | |
2739 | ||
2740 | if (!is_long_mode(vcpu) && !is_pae(vcpu)) | |
2741 | bytes = 4; | |
2742 | ||
2743 | r = mmu_topup_memory_caches(vcpu); | |
2744 | if (r) | |
2745 | return r; | |
2746 | ||
3200f405 | 2747 | if (!emulator_write_phys(vcpu, addr, &value, bytes)) |
2f333bcb MT |
2748 | return -EFAULT; |
2749 | ||
2750 | return 1; | |
2751 | } | |
2752 | ||
2753 | static int kvm_pv_mmu_flush_tlb(struct kvm_vcpu *vcpu) | |
2754 | { | |
2755 | kvm_x86_ops->tlb_flush(vcpu); | |
6ad9f15c | 2756 | set_bit(KVM_REQ_MMU_SYNC, &vcpu->requests); |
2f333bcb MT |
2757 | return 1; |
2758 | } | |
2759 | ||
2760 | static int kvm_pv_mmu_release_pt(struct kvm_vcpu *vcpu, gpa_t addr) | |
2761 | { | |
2762 | spin_lock(&vcpu->kvm->mmu_lock); | |
2763 | mmu_unshadow(vcpu->kvm, addr >> PAGE_SHIFT); | |
2764 | spin_unlock(&vcpu->kvm->mmu_lock); | |
2765 | return 1; | |
2766 | } | |
2767 | ||
2768 | static int kvm_pv_mmu_op_one(struct kvm_vcpu *vcpu, | |
2769 | struct kvm_pv_mmu_op_buffer *buffer) | |
2770 | { | |
2771 | struct kvm_mmu_op_header *header; | |
2772 | ||
2773 | header = pv_mmu_peek_buffer(buffer, sizeof *header); | |
2774 | if (!header) | |
2775 | return 0; | |
2776 | switch (header->op) { | |
2777 | case KVM_MMU_OP_WRITE_PTE: { | |
2778 | struct kvm_mmu_op_write_pte *wpte; | |
2779 | ||
2780 | wpte = pv_mmu_read_buffer(buffer, sizeof *wpte); | |
2781 | if (!wpte) | |
2782 | return 0; | |
2783 | return kvm_pv_mmu_write(vcpu, wpte->pte_phys, | |
2784 | wpte->pte_val); | |
2785 | } | |
2786 | case KVM_MMU_OP_FLUSH_TLB: { | |
2787 | struct kvm_mmu_op_flush_tlb *ftlb; | |
2788 | ||
2789 | ftlb = pv_mmu_read_buffer(buffer, sizeof *ftlb); | |
2790 | if (!ftlb) | |
2791 | return 0; | |
2792 | return kvm_pv_mmu_flush_tlb(vcpu); | |
2793 | } | |
2794 | case KVM_MMU_OP_RELEASE_PT: { | |
2795 | struct kvm_mmu_op_release_pt *rpt; | |
2796 | ||
2797 | rpt = pv_mmu_read_buffer(buffer, sizeof *rpt); | |
2798 | if (!rpt) | |
2799 | return 0; | |
2800 | return kvm_pv_mmu_release_pt(vcpu, rpt->pt_phys); | |
2801 | } | |
2802 | default: return 0; | |
2803 | } | |
2804 | } | |
2805 | ||
2806 | int kvm_pv_mmu_op(struct kvm_vcpu *vcpu, unsigned long bytes, | |
2807 | gpa_t addr, unsigned long *ret) | |
2808 | { | |
2809 | int r; | |
6ad18fba | 2810 | struct kvm_pv_mmu_op_buffer *buffer = &vcpu->arch.mmu_op_buffer; |
2f333bcb | 2811 | |
6ad18fba DH |
2812 | buffer->ptr = buffer->buf; |
2813 | buffer->len = min_t(unsigned long, bytes, sizeof buffer->buf); | |
2814 | buffer->processed = 0; | |
2f333bcb | 2815 | |
6ad18fba | 2816 | r = kvm_read_guest(vcpu->kvm, addr, buffer->buf, buffer->len); |
2f333bcb MT |
2817 | if (r) |
2818 | goto out; | |
2819 | ||
6ad18fba DH |
2820 | while (buffer->len) { |
2821 | r = kvm_pv_mmu_op_one(vcpu, buffer); | |
2f333bcb MT |
2822 | if (r < 0) |
2823 | goto out; | |
2824 | if (r == 0) | |
2825 | break; | |
2826 | } | |
2827 | ||
2828 | r = 1; | |
2829 | out: | |
6ad18fba | 2830 | *ret = buffer->processed; |
2f333bcb MT |
2831 | return r; |
2832 | } | |
2833 | ||
37a7d8b0 AK |
2834 | #ifdef AUDIT |
2835 | ||
2836 | static const char *audit_msg; | |
2837 | ||
2838 | static gva_t canonicalize(gva_t gva) | |
2839 | { | |
2840 | #ifdef CONFIG_X86_64 | |
2841 | gva = (long long)(gva << 16) >> 16; | |
2842 | #endif | |
2843 | return gva; | |
2844 | } | |
2845 | ||
2846 | static void audit_mappings_page(struct kvm_vcpu *vcpu, u64 page_pte, | |
2847 | gva_t va, int level) | |
2848 | { | |
2849 | u64 *pt = __va(page_pte & PT64_BASE_ADDR_MASK); | |
2850 | int i; | |
2851 | gva_t va_delta = 1ul << (PAGE_SHIFT + 9 * (level - 1)); | |
2852 | ||
2853 | for (i = 0; i < PT64_ENT_PER_PAGE; ++i, va += va_delta) { | |
2854 | u64 ent = pt[i]; | |
2855 | ||
c7addb90 | 2856 | if (ent == shadow_trap_nonpresent_pte) |
37a7d8b0 AK |
2857 | continue; |
2858 | ||
2859 | va = canonicalize(va); | |
c7addb90 AK |
2860 | if (level > 1) { |
2861 | if (ent == shadow_notrap_nonpresent_pte) | |
2862 | printk(KERN_ERR "audit: (%s) nontrapping pte" | |
2863 | " in nonleaf level: levels %d gva %lx" | |
2864 | " level %d pte %llx\n", audit_msg, | |
ad312c7c | 2865 | vcpu->arch.mmu.root_level, va, level, ent); |
c7addb90 | 2866 | |
37a7d8b0 | 2867 | audit_mappings_page(vcpu, ent, va, level - 1); |
c7addb90 | 2868 | } else { |
ad312c7c | 2869 | gpa_t gpa = vcpu->arch.mmu.gva_to_gpa(vcpu, va); |
35149e21 | 2870 | hpa_t hpa = (hpa_t)gpa_to_pfn(vcpu, gpa) << PAGE_SHIFT; |
37a7d8b0 | 2871 | |
c7addb90 | 2872 | if (is_shadow_present_pte(ent) |
37a7d8b0 | 2873 | && (ent & PT64_BASE_ADDR_MASK) != hpa) |
c7addb90 AK |
2874 | printk(KERN_ERR "xx audit error: (%s) levels %d" |
2875 | " gva %lx gpa %llx hpa %llx ent %llx %d\n", | |
ad312c7c | 2876 | audit_msg, vcpu->arch.mmu.root_level, |
d77c26fc MD |
2877 | va, gpa, hpa, ent, |
2878 | is_shadow_present_pte(ent)); | |
c7addb90 AK |
2879 | else if (ent == shadow_notrap_nonpresent_pte |
2880 | && !is_error_hpa(hpa)) | |
2881 | printk(KERN_ERR "audit: (%s) notrap shadow," | |
2882 | " valid guest gva %lx\n", audit_msg, va); | |
35149e21 | 2883 | kvm_release_pfn_clean(pfn); |
c7addb90 | 2884 | |
37a7d8b0 AK |
2885 | } |
2886 | } | |
2887 | } | |
2888 | ||
2889 | static void audit_mappings(struct kvm_vcpu *vcpu) | |
2890 | { | |
1ea252af | 2891 | unsigned i; |
37a7d8b0 | 2892 | |
ad312c7c ZX |
2893 | if (vcpu->arch.mmu.root_level == 4) |
2894 | audit_mappings_page(vcpu, vcpu->arch.mmu.root_hpa, 0, 4); | |
37a7d8b0 AK |
2895 | else |
2896 | for (i = 0; i < 4; ++i) | |
ad312c7c | 2897 | if (vcpu->arch.mmu.pae_root[i] & PT_PRESENT_MASK) |
37a7d8b0 | 2898 | audit_mappings_page(vcpu, |
ad312c7c | 2899 | vcpu->arch.mmu.pae_root[i], |
37a7d8b0 AK |
2900 | i << 30, |
2901 | 2); | |
2902 | } | |
2903 | ||
2904 | static int count_rmaps(struct kvm_vcpu *vcpu) | |
2905 | { | |
2906 | int nmaps = 0; | |
2907 | int i, j, k; | |
2908 | ||
2909 | for (i = 0; i < KVM_MEMORY_SLOTS; ++i) { | |
2910 | struct kvm_memory_slot *m = &vcpu->kvm->memslots[i]; | |
2911 | struct kvm_rmap_desc *d; | |
2912 | ||
2913 | for (j = 0; j < m->npages; ++j) { | |
290fc38d | 2914 | unsigned long *rmapp = &m->rmap[j]; |
37a7d8b0 | 2915 | |
290fc38d | 2916 | if (!*rmapp) |
37a7d8b0 | 2917 | continue; |
290fc38d | 2918 | if (!(*rmapp & 1)) { |
37a7d8b0 AK |
2919 | ++nmaps; |
2920 | continue; | |
2921 | } | |
290fc38d | 2922 | d = (struct kvm_rmap_desc *)(*rmapp & ~1ul); |
37a7d8b0 AK |
2923 | while (d) { |
2924 | for (k = 0; k < RMAP_EXT; ++k) | |
2925 | if (d->shadow_ptes[k]) | |
2926 | ++nmaps; | |
2927 | else | |
2928 | break; | |
2929 | d = d->more; | |
2930 | } | |
2931 | } | |
2932 | } | |
2933 | return nmaps; | |
2934 | } | |
2935 | ||
2936 | static int count_writable_mappings(struct kvm_vcpu *vcpu) | |
2937 | { | |
2938 | int nmaps = 0; | |
4db35314 | 2939 | struct kvm_mmu_page *sp; |
37a7d8b0 AK |
2940 | int i; |
2941 | ||
f05e70ac | 2942 | list_for_each_entry(sp, &vcpu->kvm->arch.active_mmu_pages, link) { |
4db35314 | 2943 | u64 *pt = sp->spt; |
37a7d8b0 | 2944 | |
4db35314 | 2945 | if (sp->role.level != PT_PAGE_TABLE_LEVEL) |
37a7d8b0 AK |
2946 | continue; |
2947 | ||
2948 | for (i = 0; i < PT64_ENT_PER_PAGE; ++i) { | |
2949 | u64 ent = pt[i]; | |
2950 | ||
2951 | if (!(ent & PT_PRESENT_MASK)) | |
2952 | continue; | |
2953 | if (!(ent & PT_WRITABLE_MASK)) | |
2954 | continue; | |
2955 | ++nmaps; | |
2956 | } | |
2957 | } | |
2958 | return nmaps; | |
2959 | } | |
2960 | ||
2961 | static void audit_rmap(struct kvm_vcpu *vcpu) | |
2962 | { | |
2963 | int n_rmap = count_rmaps(vcpu); | |
2964 | int n_actual = count_writable_mappings(vcpu); | |
2965 | ||
2966 | if (n_rmap != n_actual) | |
2967 | printk(KERN_ERR "%s: (%s) rmap %d actual %d\n", | |
b8688d51 | 2968 | __func__, audit_msg, n_rmap, n_actual); |
37a7d8b0 AK |
2969 | } |
2970 | ||
2971 | static void audit_write_protection(struct kvm_vcpu *vcpu) | |
2972 | { | |
4db35314 | 2973 | struct kvm_mmu_page *sp; |
290fc38d IE |
2974 | struct kvm_memory_slot *slot; |
2975 | unsigned long *rmapp; | |
2976 | gfn_t gfn; | |
37a7d8b0 | 2977 | |
f05e70ac | 2978 | list_for_each_entry(sp, &vcpu->kvm->arch.active_mmu_pages, link) { |
4db35314 | 2979 | if (sp->role.metaphysical) |
37a7d8b0 AK |
2980 | continue; |
2981 | ||
4db35314 | 2982 | gfn = unalias_gfn(vcpu->kvm, sp->gfn); |
2843099f | 2983 | slot = gfn_to_memslot_unaliased(vcpu->kvm, sp->gfn); |
290fc38d IE |
2984 | rmapp = &slot->rmap[gfn - slot->base_gfn]; |
2985 | if (*rmapp) | |
37a7d8b0 AK |
2986 | printk(KERN_ERR "%s: (%s) shadow page has writable" |
2987 | " mappings: gfn %lx role %x\n", | |
b8688d51 | 2988 | __func__, audit_msg, sp->gfn, |
4db35314 | 2989 | sp->role.word); |
37a7d8b0 AK |
2990 | } |
2991 | } | |
2992 | ||
2993 | static void kvm_mmu_audit(struct kvm_vcpu *vcpu, const char *msg) | |
2994 | { | |
2995 | int olddbg = dbg; | |
2996 | ||
2997 | dbg = 0; | |
2998 | audit_msg = msg; | |
2999 | audit_rmap(vcpu); | |
3000 | audit_write_protection(vcpu); | |
3001 | audit_mappings(vcpu); | |
3002 | dbg = olddbg; | |
3003 | } | |
3004 | ||
3005 | #endif |