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Commit | Line | Data |
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6aa8b732 AK |
1 | /* |
2 | * Kernel-based Virtual Machine driver for Linux | |
3 | * | |
4 | * This module enables machines with Intel VT-x extensions to run virtual | |
5 | * machines without emulation or binary translation. | |
6 | * | |
7 | * MMU support | |
8 | * | |
9 | * Copyright (C) 2006 Qumranet, Inc. | |
10 | * | |
11 | * Authors: | |
12 | * Yaniv Kamay <yaniv@qumranet.com> | |
13 | * Avi Kivity <avi@qumranet.com> | |
14 | * | |
15 | * This work is licensed under the terms of the GNU GPL, version 2. See | |
16 | * the COPYING file in the top-level directory. | |
17 | * | |
18 | */ | |
e495606d | 19 | |
1d737c8a | 20 | #include "mmu.h" |
836a1b3c | 21 | #include "x86.h" |
6de4f3ad | 22 | #include "kvm_cache_regs.h" |
e495606d | 23 | |
edf88417 | 24 | #include <linux/kvm_host.h> |
6aa8b732 AK |
25 | #include <linux/types.h> |
26 | #include <linux/string.h> | |
6aa8b732 AK |
27 | #include <linux/mm.h> |
28 | #include <linux/highmem.h> | |
29 | #include <linux/module.h> | |
448353ca | 30 | #include <linux/swap.h> |
05da4558 | 31 | #include <linux/hugetlb.h> |
2f333bcb | 32 | #include <linux/compiler.h> |
bc6678a3 | 33 | #include <linux/srcu.h> |
5a0e3ad6 | 34 | #include <linux/slab.h> |
6aa8b732 | 35 | |
e495606d AK |
36 | #include <asm/page.h> |
37 | #include <asm/cmpxchg.h> | |
4e542370 | 38 | #include <asm/io.h> |
13673a90 | 39 | #include <asm/vmx.h> |
6aa8b732 | 40 | |
18552672 JR |
41 | /* |
42 | * When setting this variable to true it enables Two-Dimensional-Paging | |
43 | * where the hardware walks 2 page tables: | |
44 | * 1. the guest-virtual to guest-physical | |
45 | * 2. while doing 1. it walks guest-physical to host-physical | |
46 | * If the hardware supports that we don't need to do shadow paging. | |
47 | */ | |
2f333bcb | 48 | bool tdp_enabled = false; |
18552672 | 49 | |
37a7d8b0 AK |
50 | #undef MMU_DEBUG |
51 | ||
52 | #undef AUDIT | |
53 | ||
54 | #ifdef AUDIT | |
55 | static void kvm_mmu_audit(struct kvm_vcpu *vcpu, const char *msg); | |
56 | #else | |
57 | static void kvm_mmu_audit(struct kvm_vcpu *vcpu, const char *msg) {} | |
58 | #endif | |
59 | ||
60 | #ifdef MMU_DEBUG | |
61 | ||
62 | #define pgprintk(x...) do { if (dbg) printk(x); } while (0) | |
63 | #define rmap_printk(x...) do { if (dbg) printk(x); } while (0) | |
64 | ||
65 | #else | |
66 | ||
67 | #define pgprintk(x...) do { } while (0) | |
68 | #define rmap_printk(x...) do { } while (0) | |
69 | ||
70 | #endif | |
71 | ||
72 | #if defined(MMU_DEBUG) || defined(AUDIT) | |
6ada8cca AK |
73 | static int dbg = 0; |
74 | module_param(dbg, bool, 0644); | |
37a7d8b0 | 75 | #endif |
6aa8b732 | 76 | |
582801a9 MT |
77 | static int oos_shadow = 1; |
78 | module_param(oos_shadow, bool, 0644); | |
79 | ||
d6c69ee9 YD |
80 | #ifndef MMU_DEBUG |
81 | #define ASSERT(x) do { } while (0) | |
82 | #else | |
6aa8b732 AK |
83 | #define ASSERT(x) \ |
84 | if (!(x)) { \ | |
85 | printk(KERN_WARNING "assertion failed %s:%d: %s\n", \ | |
86 | __FILE__, __LINE__, #x); \ | |
87 | } | |
d6c69ee9 | 88 | #endif |
6aa8b732 | 89 | |
6aa8b732 AK |
90 | #define PT_FIRST_AVAIL_BITS_SHIFT 9 |
91 | #define PT64_SECOND_AVAIL_BITS_SHIFT 52 | |
92 | ||
6aa8b732 AK |
93 | #define VALID_PAGE(x) ((x) != INVALID_PAGE) |
94 | ||
95 | #define PT64_LEVEL_BITS 9 | |
96 | ||
97 | #define PT64_LEVEL_SHIFT(level) \ | |
d77c26fc | 98 | (PAGE_SHIFT + (level - 1) * PT64_LEVEL_BITS) |
6aa8b732 AK |
99 | |
100 | #define PT64_LEVEL_MASK(level) \ | |
101 | (((1ULL << PT64_LEVEL_BITS) - 1) << PT64_LEVEL_SHIFT(level)) | |
102 | ||
103 | #define PT64_INDEX(address, level)\ | |
104 | (((address) >> PT64_LEVEL_SHIFT(level)) & ((1 << PT64_LEVEL_BITS) - 1)) | |
105 | ||
106 | ||
107 | #define PT32_LEVEL_BITS 10 | |
108 | ||
109 | #define PT32_LEVEL_SHIFT(level) \ | |
d77c26fc | 110 | (PAGE_SHIFT + (level - 1) * PT32_LEVEL_BITS) |
6aa8b732 AK |
111 | |
112 | #define PT32_LEVEL_MASK(level) \ | |
113 | (((1ULL << PT32_LEVEL_BITS) - 1) << PT32_LEVEL_SHIFT(level)) | |
e04da980 JR |
114 | #define PT32_LVL_OFFSET_MASK(level) \ |
115 | (PT32_BASE_ADDR_MASK & ((1ULL << (PAGE_SHIFT + (((level) - 1) \ | |
116 | * PT32_LEVEL_BITS))) - 1)) | |
6aa8b732 AK |
117 | |
118 | #define PT32_INDEX(address, level)\ | |
119 | (((address) >> PT32_LEVEL_SHIFT(level)) & ((1 << PT32_LEVEL_BITS) - 1)) | |
120 | ||
121 | ||
27aba766 | 122 | #define PT64_BASE_ADDR_MASK (((1ULL << 52) - 1) & ~(u64)(PAGE_SIZE-1)) |
6aa8b732 AK |
123 | #define PT64_DIR_BASE_ADDR_MASK \ |
124 | (PT64_BASE_ADDR_MASK & ~((1ULL << (PAGE_SHIFT + PT64_LEVEL_BITS)) - 1)) | |
e04da980 JR |
125 | #define PT64_LVL_ADDR_MASK(level) \ |
126 | (PT64_BASE_ADDR_MASK & ~((1ULL << (PAGE_SHIFT + (((level) - 1) \ | |
127 | * PT64_LEVEL_BITS))) - 1)) | |
128 | #define PT64_LVL_OFFSET_MASK(level) \ | |
129 | (PT64_BASE_ADDR_MASK & ((1ULL << (PAGE_SHIFT + (((level) - 1) \ | |
130 | * PT64_LEVEL_BITS))) - 1)) | |
6aa8b732 AK |
131 | |
132 | #define PT32_BASE_ADDR_MASK PAGE_MASK | |
133 | #define PT32_DIR_BASE_ADDR_MASK \ | |
134 | (PAGE_MASK & ~((1ULL << (PAGE_SHIFT + PT32_LEVEL_BITS)) - 1)) | |
e04da980 JR |
135 | #define PT32_LVL_ADDR_MASK(level) \ |
136 | (PAGE_MASK & ~((1ULL << (PAGE_SHIFT + (((level) - 1) \ | |
137 | * PT32_LEVEL_BITS))) - 1)) | |
6aa8b732 | 138 | |
79539cec AK |
139 | #define PT64_PERM_MASK (PT_PRESENT_MASK | PT_WRITABLE_MASK | PT_USER_MASK \ |
140 | | PT64_NX_MASK) | |
6aa8b732 | 141 | |
cd4a4e53 AK |
142 | #define RMAP_EXT 4 |
143 | ||
fe135d2c AK |
144 | #define ACC_EXEC_MASK 1 |
145 | #define ACC_WRITE_MASK PT_WRITABLE_MASK | |
146 | #define ACC_USER_MASK PT_USER_MASK | |
147 | #define ACC_ALL (ACC_EXEC_MASK | ACC_WRITE_MASK | ACC_USER_MASK) | |
148 | ||
90bb6fc5 AK |
149 | #include <trace/events/kvm.h> |
150 | ||
07420171 AK |
151 | #define CREATE_TRACE_POINTS |
152 | #include "mmutrace.h" | |
153 | ||
1403283a IE |
154 | #define SPTE_HOST_WRITEABLE (1ULL << PT_FIRST_AVAIL_BITS_SHIFT) |
155 | ||
135f8c2b AK |
156 | #define SHADOW_PT_INDEX(addr, level) PT64_INDEX(addr, level) |
157 | ||
cd4a4e53 | 158 | struct kvm_rmap_desc { |
d555c333 | 159 | u64 *sptes[RMAP_EXT]; |
cd4a4e53 AK |
160 | struct kvm_rmap_desc *more; |
161 | }; | |
162 | ||
2d11123a AK |
163 | struct kvm_shadow_walk_iterator { |
164 | u64 addr; | |
165 | hpa_t shadow_addr; | |
166 | int level; | |
167 | u64 *sptep; | |
168 | unsigned index; | |
169 | }; | |
170 | ||
171 | #define for_each_shadow_entry(_vcpu, _addr, _walker) \ | |
172 | for (shadow_walk_init(&(_walker), _vcpu, _addr); \ | |
173 | shadow_walk_okay(&(_walker)); \ | |
174 | shadow_walk_next(&(_walker))) | |
175 | ||
6b18493d | 176 | typedef int (*mmu_parent_walk_fn) (struct kvm_mmu_page *sp); |
ad8cfbe3 | 177 | |
b5a33a75 AK |
178 | static struct kmem_cache *pte_chain_cache; |
179 | static struct kmem_cache *rmap_desc_cache; | |
d3d25b04 | 180 | static struct kmem_cache *mmu_page_header_cache; |
b5a33a75 | 181 | |
c7addb90 AK |
182 | static u64 __read_mostly shadow_trap_nonpresent_pte; |
183 | static u64 __read_mostly shadow_notrap_nonpresent_pte; | |
7b52345e SY |
184 | static u64 __read_mostly shadow_base_present_pte; |
185 | static u64 __read_mostly shadow_nx_mask; | |
186 | static u64 __read_mostly shadow_x_mask; /* mutual exclusive with nx_mask */ | |
187 | static u64 __read_mostly shadow_user_mask; | |
188 | static u64 __read_mostly shadow_accessed_mask; | |
189 | static u64 __read_mostly shadow_dirty_mask; | |
c7addb90 | 190 | |
82725b20 DE |
191 | static inline u64 rsvd_bits(int s, int e) |
192 | { | |
193 | return ((1ULL << (e - s + 1)) - 1) << s; | |
194 | } | |
195 | ||
c7addb90 AK |
196 | void kvm_mmu_set_nonpresent_ptes(u64 trap_pte, u64 notrap_pte) |
197 | { | |
198 | shadow_trap_nonpresent_pte = trap_pte; | |
199 | shadow_notrap_nonpresent_pte = notrap_pte; | |
200 | } | |
201 | EXPORT_SYMBOL_GPL(kvm_mmu_set_nonpresent_ptes); | |
202 | ||
7b52345e SY |
203 | void kvm_mmu_set_base_ptes(u64 base_pte) |
204 | { | |
205 | shadow_base_present_pte = base_pte; | |
206 | } | |
207 | EXPORT_SYMBOL_GPL(kvm_mmu_set_base_ptes); | |
208 | ||
209 | void kvm_mmu_set_mask_ptes(u64 user_mask, u64 accessed_mask, | |
4b12f0de | 210 | u64 dirty_mask, u64 nx_mask, u64 x_mask) |
7b52345e SY |
211 | { |
212 | shadow_user_mask = user_mask; | |
213 | shadow_accessed_mask = accessed_mask; | |
214 | shadow_dirty_mask = dirty_mask; | |
215 | shadow_nx_mask = nx_mask; | |
216 | shadow_x_mask = x_mask; | |
217 | } | |
218 | EXPORT_SYMBOL_GPL(kvm_mmu_set_mask_ptes); | |
219 | ||
6aa8b732 AK |
220 | static int is_write_protection(struct kvm_vcpu *vcpu) |
221 | { | |
4d4ec087 | 222 | return kvm_read_cr0_bits(vcpu, X86_CR0_WP); |
6aa8b732 AK |
223 | } |
224 | ||
225 | static int is_cpuid_PSE36(void) | |
226 | { | |
227 | return 1; | |
228 | } | |
229 | ||
73b1087e AK |
230 | static int is_nx(struct kvm_vcpu *vcpu) |
231 | { | |
f6801dff | 232 | return vcpu->arch.efer & EFER_NX; |
73b1087e AK |
233 | } |
234 | ||
c7addb90 AK |
235 | static int is_shadow_present_pte(u64 pte) |
236 | { | |
c7addb90 AK |
237 | return pte != shadow_trap_nonpresent_pte |
238 | && pte != shadow_notrap_nonpresent_pte; | |
239 | } | |
240 | ||
05da4558 MT |
241 | static int is_large_pte(u64 pte) |
242 | { | |
243 | return pte & PT_PAGE_SIZE_MASK; | |
244 | } | |
245 | ||
8dae4445 | 246 | static int is_writable_pte(unsigned long pte) |
6aa8b732 AK |
247 | { |
248 | return pte & PT_WRITABLE_MASK; | |
249 | } | |
250 | ||
43a3795a | 251 | static int is_dirty_gpte(unsigned long pte) |
e3c5e7ec | 252 | { |
439e218a | 253 | return pte & PT_DIRTY_MASK; |
e3c5e7ec AK |
254 | } |
255 | ||
43a3795a | 256 | static int is_rmap_spte(u64 pte) |
cd4a4e53 | 257 | { |
4b1a80fa | 258 | return is_shadow_present_pte(pte); |
cd4a4e53 AK |
259 | } |
260 | ||
776e6633 MT |
261 | static int is_last_spte(u64 pte, int level) |
262 | { | |
263 | if (level == PT_PAGE_TABLE_LEVEL) | |
264 | return 1; | |
852e3c19 | 265 | if (is_large_pte(pte)) |
776e6633 MT |
266 | return 1; |
267 | return 0; | |
268 | } | |
269 | ||
35149e21 | 270 | static pfn_t spte_to_pfn(u64 pte) |
0b49ea86 | 271 | { |
35149e21 | 272 | return (pte & PT64_BASE_ADDR_MASK) >> PAGE_SHIFT; |
0b49ea86 AK |
273 | } |
274 | ||
da928521 AK |
275 | static gfn_t pse36_gfn_delta(u32 gpte) |
276 | { | |
277 | int shift = 32 - PT32_DIR_PSE36_SHIFT - PAGE_SHIFT; | |
278 | ||
279 | return (gpte & PT32_DIR_PSE36_MASK) << shift; | |
280 | } | |
281 | ||
d555c333 | 282 | static void __set_spte(u64 *sptep, u64 spte) |
e663ee64 AK |
283 | { |
284 | #ifdef CONFIG_X86_64 | |
285 | set_64bit((unsigned long *)sptep, spte); | |
286 | #else | |
287 | set_64bit((unsigned long long *)sptep, spte); | |
288 | #endif | |
289 | } | |
290 | ||
e2dec939 | 291 | static int mmu_topup_memory_cache(struct kvm_mmu_memory_cache *cache, |
2e3e5882 | 292 | struct kmem_cache *base_cache, int min) |
714b93da AK |
293 | { |
294 | void *obj; | |
295 | ||
296 | if (cache->nobjs >= min) | |
e2dec939 | 297 | return 0; |
714b93da | 298 | while (cache->nobjs < ARRAY_SIZE(cache->objects)) { |
2e3e5882 | 299 | obj = kmem_cache_zalloc(base_cache, GFP_KERNEL); |
714b93da | 300 | if (!obj) |
e2dec939 | 301 | return -ENOMEM; |
714b93da AK |
302 | cache->objects[cache->nobjs++] = obj; |
303 | } | |
e2dec939 | 304 | return 0; |
714b93da AK |
305 | } |
306 | ||
307 | static void mmu_free_memory_cache(struct kvm_mmu_memory_cache *mc) | |
308 | { | |
309 | while (mc->nobjs) | |
310 | kfree(mc->objects[--mc->nobjs]); | |
311 | } | |
312 | ||
c1158e63 | 313 | static int mmu_topup_memory_cache_page(struct kvm_mmu_memory_cache *cache, |
2e3e5882 | 314 | int min) |
c1158e63 AK |
315 | { |
316 | struct page *page; | |
317 | ||
318 | if (cache->nobjs >= min) | |
319 | return 0; | |
320 | while (cache->nobjs < ARRAY_SIZE(cache->objects)) { | |
2e3e5882 | 321 | page = alloc_page(GFP_KERNEL); |
c1158e63 AK |
322 | if (!page) |
323 | return -ENOMEM; | |
c1158e63 AK |
324 | cache->objects[cache->nobjs++] = page_address(page); |
325 | } | |
326 | return 0; | |
327 | } | |
328 | ||
329 | static void mmu_free_memory_cache_page(struct kvm_mmu_memory_cache *mc) | |
330 | { | |
331 | while (mc->nobjs) | |
c4d198d5 | 332 | free_page((unsigned long)mc->objects[--mc->nobjs]); |
c1158e63 AK |
333 | } |
334 | ||
2e3e5882 | 335 | static int mmu_topup_memory_caches(struct kvm_vcpu *vcpu) |
714b93da | 336 | { |
e2dec939 AK |
337 | int r; |
338 | ||
ad312c7c | 339 | r = mmu_topup_memory_cache(&vcpu->arch.mmu_pte_chain_cache, |
2e3e5882 | 340 | pte_chain_cache, 4); |
e2dec939 AK |
341 | if (r) |
342 | goto out; | |
ad312c7c | 343 | r = mmu_topup_memory_cache(&vcpu->arch.mmu_rmap_desc_cache, |
c41ef344 | 344 | rmap_desc_cache, 4); |
d3d25b04 AK |
345 | if (r) |
346 | goto out; | |
ad312c7c | 347 | r = mmu_topup_memory_cache_page(&vcpu->arch.mmu_page_cache, 8); |
d3d25b04 AK |
348 | if (r) |
349 | goto out; | |
ad312c7c | 350 | r = mmu_topup_memory_cache(&vcpu->arch.mmu_page_header_cache, |
2e3e5882 | 351 | mmu_page_header_cache, 4); |
e2dec939 AK |
352 | out: |
353 | return r; | |
714b93da AK |
354 | } |
355 | ||
356 | static void mmu_free_memory_caches(struct kvm_vcpu *vcpu) | |
357 | { | |
ad312c7c ZX |
358 | mmu_free_memory_cache(&vcpu->arch.mmu_pte_chain_cache); |
359 | mmu_free_memory_cache(&vcpu->arch.mmu_rmap_desc_cache); | |
360 | mmu_free_memory_cache_page(&vcpu->arch.mmu_page_cache); | |
361 | mmu_free_memory_cache(&vcpu->arch.mmu_page_header_cache); | |
714b93da AK |
362 | } |
363 | ||
364 | static void *mmu_memory_cache_alloc(struct kvm_mmu_memory_cache *mc, | |
365 | size_t size) | |
366 | { | |
367 | void *p; | |
368 | ||
369 | BUG_ON(!mc->nobjs); | |
370 | p = mc->objects[--mc->nobjs]; | |
714b93da AK |
371 | return p; |
372 | } | |
373 | ||
714b93da AK |
374 | static struct kvm_pte_chain *mmu_alloc_pte_chain(struct kvm_vcpu *vcpu) |
375 | { | |
ad312c7c | 376 | return mmu_memory_cache_alloc(&vcpu->arch.mmu_pte_chain_cache, |
714b93da AK |
377 | sizeof(struct kvm_pte_chain)); |
378 | } | |
379 | ||
90cb0529 | 380 | static void mmu_free_pte_chain(struct kvm_pte_chain *pc) |
714b93da | 381 | { |
90cb0529 | 382 | kfree(pc); |
714b93da AK |
383 | } |
384 | ||
385 | static struct kvm_rmap_desc *mmu_alloc_rmap_desc(struct kvm_vcpu *vcpu) | |
386 | { | |
ad312c7c | 387 | return mmu_memory_cache_alloc(&vcpu->arch.mmu_rmap_desc_cache, |
714b93da AK |
388 | sizeof(struct kvm_rmap_desc)); |
389 | } | |
390 | ||
90cb0529 | 391 | static void mmu_free_rmap_desc(struct kvm_rmap_desc *rd) |
714b93da | 392 | { |
90cb0529 | 393 | kfree(rd); |
714b93da AK |
394 | } |
395 | ||
05da4558 MT |
396 | /* |
397 | * Return the pointer to the largepage write count for a given | |
398 | * gfn, handling slots that are not large page aligned. | |
399 | */ | |
d25797b2 JR |
400 | static int *slot_largepage_idx(gfn_t gfn, |
401 | struct kvm_memory_slot *slot, | |
402 | int level) | |
05da4558 MT |
403 | { |
404 | unsigned long idx; | |
405 | ||
d25797b2 JR |
406 | idx = (gfn / KVM_PAGES_PER_HPAGE(level)) - |
407 | (slot->base_gfn / KVM_PAGES_PER_HPAGE(level)); | |
408 | return &slot->lpage_info[level - 2][idx].write_count; | |
05da4558 MT |
409 | } |
410 | ||
411 | static void account_shadowed(struct kvm *kvm, gfn_t gfn) | |
412 | { | |
d25797b2 | 413 | struct kvm_memory_slot *slot; |
05da4558 | 414 | int *write_count; |
d25797b2 | 415 | int i; |
05da4558 | 416 | |
2843099f | 417 | gfn = unalias_gfn(kvm, gfn); |
d25797b2 JR |
418 | |
419 | slot = gfn_to_memslot_unaliased(kvm, gfn); | |
420 | for (i = PT_DIRECTORY_LEVEL; | |
421 | i < PT_PAGE_TABLE_LEVEL + KVM_NR_PAGE_SIZES; ++i) { | |
422 | write_count = slot_largepage_idx(gfn, slot, i); | |
423 | *write_count += 1; | |
424 | } | |
05da4558 MT |
425 | } |
426 | ||
427 | static void unaccount_shadowed(struct kvm *kvm, gfn_t gfn) | |
428 | { | |
d25797b2 | 429 | struct kvm_memory_slot *slot; |
05da4558 | 430 | int *write_count; |
d25797b2 | 431 | int i; |
05da4558 | 432 | |
2843099f | 433 | gfn = unalias_gfn(kvm, gfn); |
77a1a715 | 434 | slot = gfn_to_memslot_unaliased(kvm, gfn); |
d25797b2 JR |
435 | for (i = PT_DIRECTORY_LEVEL; |
436 | i < PT_PAGE_TABLE_LEVEL + KVM_NR_PAGE_SIZES; ++i) { | |
d25797b2 JR |
437 | write_count = slot_largepage_idx(gfn, slot, i); |
438 | *write_count -= 1; | |
439 | WARN_ON(*write_count < 0); | |
440 | } | |
05da4558 MT |
441 | } |
442 | ||
d25797b2 JR |
443 | static int has_wrprotected_page(struct kvm *kvm, |
444 | gfn_t gfn, | |
445 | int level) | |
05da4558 | 446 | { |
2843099f | 447 | struct kvm_memory_slot *slot; |
05da4558 MT |
448 | int *largepage_idx; |
449 | ||
2843099f IE |
450 | gfn = unalias_gfn(kvm, gfn); |
451 | slot = gfn_to_memslot_unaliased(kvm, gfn); | |
05da4558 | 452 | if (slot) { |
d25797b2 | 453 | largepage_idx = slot_largepage_idx(gfn, slot, level); |
05da4558 MT |
454 | return *largepage_idx; |
455 | } | |
456 | ||
457 | return 1; | |
458 | } | |
459 | ||
d25797b2 | 460 | static int host_mapping_level(struct kvm *kvm, gfn_t gfn) |
05da4558 | 461 | { |
8f0b1ab6 | 462 | unsigned long page_size; |
d25797b2 | 463 | int i, ret = 0; |
05da4558 | 464 | |
8f0b1ab6 | 465 | page_size = kvm_host_page_size(kvm, gfn); |
05da4558 | 466 | |
d25797b2 JR |
467 | for (i = PT_PAGE_TABLE_LEVEL; |
468 | i < (PT_PAGE_TABLE_LEVEL + KVM_NR_PAGE_SIZES); ++i) { | |
469 | if (page_size >= KVM_HPAGE_SIZE(i)) | |
470 | ret = i; | |
471 | else | |
472 | break; | |
473 | } | |
474 | ||
4c2155ce | 475 | return ret; |
05da4558 MT |
476 | } |
477 | ||
d25797b2 | 478 | static int mapping_level(struct kvm_vcpu *vcpu, gfn_t large_gfn) |
05da4558 MT |
479 | { |
480 | struct kvm_memory_slot *slot; | |
878403b7 | 481 | int host_level, level, max_level; |
05da4558 MT |
482 | |
483 | slot = gfn_to_memslot(vcpu->kvm, large_gfn); | |
484 | if (slot && slot->dirty_bitmap) | |
d25797b2 | 485 | return PT_PAGE_TABLE_LEVEL; |
05da4558 | 486 | |
d25797b2 JR |
487 | host_level = host_mapping_level(vcpu->kvm, large_gfn); |
488 | ||
489 | if (host_level == PT_PAGE_TABLE_LEVEL) | |
490 | return host_level; | |
491 | ||
878403b7 SY |
492 | max_level = kvm_x86_ops->get_lpage_level() < host_level ? |
493 | kvm_x86_ops->get_lpage_level() : host_level; | |
494 | ||
495 | for (level = PT_DIRECTORY_LEVEL; level <= max_level; ++level) | |
d25797b2 JR |
496 | if (has_wrprotected_page(vcpu->kvm, large_gfn, level)) |
497 | break; | |
d25797b2 JR |
498 | |
499 | return level - 1; | |
05da4558 MT |
500 | } |
501 | ||
290fc38d IE |
502 | /* |
503 | * Take gfn and return the reverse mapping to it. | |
504 | * Note: gfn must be unaliased before this function get called | |
505 | */ | |
506 | ||
44ad9944 | 507 | static unsigned long *gfn_to_rmap(struct kvm *kvm, gfn_t gfn, int level) |
290fc38d IE |
508 | { |
509 | struct kvm_memory_slot *slot; | |
05da4558 | 510 | unsigned long idx; |
290fc38d IE |
511 | |
512 | slot = gfn_to_memslot(kvm, gfn); | |
44ad9944 | 513 | if (likely(level == PT_PAGE_TABLE_LEVEL)) |
05da4558 MT |
514 | return &slot->rmap[gfn - slot->base_gfn]; |
515 | ||
44ad9944 JR |
516 | idx = (gfn / KVM_PAGES_PER_HPAGE(level)) - |
517 | (slot->base_gfn / KVM_PAGES_PER_HPAGE(level)); | |
05da4558 | 518 | |
44ad9944 | 519 | return &slot->lpage_info[level - 2][idx].rmap_pde; |
290fc38d IE |
520 | } |
521 | ||
cd4a4e53 AK |
522 | /* |
523 | * Reverse mapping data structures: | |
524 | * | |
290fc38d IE |
525 | * If rmapp bit zero is zero, then rmapp point to the shadw page table entry |
526 | * that points to page_address(page). | |
cd4a4e53 | 527 | * |
290fc38d IE |
528 | * If rmapp bit zero is one, (then rmap & ~1) points to a struct kvm_rmap_desc |
529 | * containing more mappings. | |
53a27b39 MT |
530 | * |
531 | * Returns the number of rmap entries before the spte was added or zero if | |
532 | * the spte was not added. | |
533 | * | |
cd4a4e53 | 534 | */ |
44ad9944 | 535 | static int rmap_add(struct kvm_vcpu *vcpu, u64 *spte, gfn_t gfn) |
cd4a4e53 | 536 | { |
4db35314 | 537 | struct kvm_mmu_page *sp; |
cd4a4e53 | 538 | struct kvm_rmap_desc *desc; |
290fc38d | 539 | unsigned long *rmapp; |
53a27b39 | 540 | int i, count = 0; |
cd4a4e53 | 541 | |
43a3795a | 542 | if (!is_rmap_spte(*spte)) |
53a27b39 | 543 | return count; |
290fc38d | 544 | gfn = unalias_gfn(vcpu->kvm, gfn); |
4db35314 AK |
545 | sp = page_header(__pa(spte)); |
546 | sp->gfns[spte - sp->spt] = gfn; | |
44ad9944 | 547 | rmapp = gfn_to_rmap(vcpu->kvm, gfn, sp->role.level); |
290fc38d | 548 | if (!*rmapp) { |
cd4a4e53 | 549 | rmap_printk("rmap_add: %p %llx 0->1\n", spte, *spte); |
290fc38d IE |
550 | *rmapp = (unsigned long)spte; |
551 | } else if (!(*rmapp & 1)) { | |
cd4a4e53 | 552 | rmap_printk("rmap_add: %p %llx 1->many\n", spte, *spte); |
714b93da | 553 | desc = mmu_alloc_rmap_desc(vcpu); |
d555c333 AK |
554 | desc->sptes[0] = (u64 *)*rmapp; |
555 | desc->sptes[1] = spte; | |
290fc38d | 556 | *rmapp = (unsigned long)desc | 1; |
cd4a4e53 AK |
557 | } else { |
558 | rmap_printk("rmap_add: %p %llx many->many\n", spte, *spte); | |
290fc38d | 559 | desc = (struct kvm_rmap_desc *)(*rmapp & ~1ul); |
d555c333 | 560 | while (desc->sptes[RMAP_EXT-1] && desc->more) { |
cd4a4e53 | 561 | desc = desc->more; |
53a27b39 MT |
562 | count += RMAP_EXT; |
563 | } | |
d555c333 | 564 | if (desc->sptes[RMAP_EXT-1]) { |
714b93da | 565 | desc->more = mmu_alloc_rmap_desc(vcpu); |
cd4a4e53 AK |
566 | desc = desc->more; |
567 | } | |
d555c333 | 568 | for (i = 0; desc->sptes[i]; ++i) |
cd4a4e53 | 569 | ; |
d555c333 | 570 | desc->sptes[i] = spte; |
cd4a4e53 | 571 | } |
53a27b39 | 572 | return count; |
cd4a4e53 AK |
573 | } |
574 | ||
290fc38d | 575 | static void rmap_desc_remove_entry(unsigned long *rmapp, |
cd4a4e53 AK |
576 | struct kvm_rmap_desc *desc, |
577 | int i, | |
578 | struct kvm_rmap_desc *prev_desc) | |
579 | { | |
580 | int j; | |
581 | ||
d555c333 | 582 | for (j = RMAP_EXT - 1; !desc->sptes[j] && j > i; --j) |
cd4a4e53 | 583 | ; |
d555c333 AK |
584 | desc->sptes[i] = desc->sptes[j]; |
585 | desc->sptes[j] = NULL; | |
cd4a4e53 AK |
586 | if (j != 0) |
587 | return; | |
588 | if (!prev_desc && !desc->more) | |
d555c333 | 589 | *rmapp = (unsigned long)desc->sptes[0]; |
cd4a4e53 AK |
590 | else |
591 | if (prev_desc) | |
592 | prev_desc->more = desc->more; | |
593 | else | |
290fc38d | 594 | *rmapp = (unsigned long)desc->more | 1; |
90cb0529 | 595 | mmu_free_rmap_desc(desc); |
cd4a4e53 AK |
596 | } |
597 | ||
290fc38d | 598 | static void rmap_remove(struct kvm *kvm, u64 *spte) |
cd4a4e53 | 599 | { |
cd4a4e53 AK |
600 | struct kvm_rmap_desc *desc; |
601 | struct kvm_rmap_desc *prev_desc; | |
4db35314 | 602 | struct kvm_mmu_page *sp; |
35149e21 | 603 | pfn_t pfn; |
290fc38d | 604 | unsigned long *rmapp; |
cd4a4e53 AK |
605 | int i; |
606 | ||
43a3795a | 607 | if (!is_rmap_spte(*spte)) |
cd4a4e53 | 608 | return; |
4db35314 | 609 | sp = page_header(__pa(spte)); |
35149e21 | 610 | pfn = spte_to_pfn(*spte); |
7b52345e | 611 | if (*spte & shadow_accessed_mask) |
35149e21 | 612 | kvm_set_pfn_accessed(pfn); |
8dae4445 | 613 | if (is_writable_pte(*spte)) |
acb66dd0 | 614 | kvm_set_pfn_dirty(pfn); |
44ad9944 | 615 | rmapp = gfn_to_rmap(kvm, sp->gfns[spte - sp->spt], sp->role.level); |
290fc38d | 616 | if (!*rmapp) { |
cd4a4e53 AK |
617 | printk(KERN_ERR "rmap_remove: %p %llx 0->BUG\n", spte, *spte); |
618 | BUG(); | |
290fc38d | 619 | } else if (!(*rmapp & 1)) { |
cd4a4e53 | 620 | rmap_printk("rmap_remove: %p %llx 1->0\n", spte, *spte); |
290fc38d | 621 | if ((u64 *)*rmapp != spte) { |
cd4a4e53 AK |
622 | printk(KERN_ERR "rmap_remove: %p %llx 1->BUG\n", |
623 | spte, *spte); | |
624 | BUG(); | |
625 | } | |
290fc38d | 626 | *rmapp = 0; |
cd4a4e53 AK |
627 | } else { |
628 | rmap_printk("rmap_remove: %p %llx many->many\n", spte, *spte); | |
290fc38d | 629 | desc = (struct kvm_rmap_desc *)(*rmapp & ~1ul); |
cd4a4e53 AK |
630 | prev_desc = NULL; |
631 | while (desc) { | |
d555c333 AK |
632 | for (i = 0; i < RMAP_EXT && desc->sptes[i]; ++i) |
633 | if (desc->sptes[i] == spte) { | |
290fc38d | 634 | rmap_desc_remove_entry(rmapp, |
714b93da | 635 | desc, i, |
cd4a4e53 AK |
636 | prev_desc); |
637 | return; | |
638 | } | |
639 | prev_desc = desc; | |
640 | desc = desc->more; | |
641 | } | |
186a3e52 | 642 | pr_err("rmap_remove: %p %llx many->many\n", spte, *spte); |
cd4a4e53 AK |
643 | BUG(); |
644 | } | |
645 | } | |
646 | ||
98348e95 | 647 | static u64 *rmap_next(struct kvm *kvm, unsigned long *rmapp, u64 *spte) |
374cbac0 | 648 | { |
374cbac0 | 649 | struct kvm_rmap_desc *desc; |
98348e95 IE |
650 | u64 *prev_spte; |
651 | int i; | |
652 | ||
653 | if (!*rmapp) | |
654 | return NULL; | |
655 | else if (!(*rmapp & 1)) { | |
656 | if (!spte) | |
657 | return (u64 *)*rmapp; | |
658 | return NULL; | |
659 | } | |
660 | desc = (struct kvm_rmap_desc *)(*rmapp & ~1ul); | |
98348e95 IE |
661 | prev_spte = NULL; |
662 | while (desc) { | |
d555c333 | 663 | for (i = 0; i < RMAP_EXT && desc->sptes[i]; ++i) { |
98348e95 | 664 | if (prev_spte == spte) |
d555c333 AK |
665 | return desc->sptes[i]; |
666 | prev_spte = desc->sptes[i]; | |
98348e95 IE |
667 | } |
668 | desc = desc->more; | |
669 | } | |
670 | return NULL; | |
671 | } | |
672 | ||
b1a36821 | 673 | static int rmap_write_protect(struct kvm *kvm, u64 gfn) |
98348e95 | 674 | { |
290fc38d | 675 | unsigned long *rmapp; |
374cbac0 | 676 | u64 *spte; |
44ad9944 | 677 | int i, write_protected = 0; |
374cbac0 | 678 | |
4a4c9924 | 679 | gfn = unalias_gfn(kvm, gfn); |
44ad9944 | 680 | rmapp = gfn_to_rmap(kvm, gfn, PT_PAGE_TABLE_LEVEL); |
374cbac0 | 681 | |
98348e95 IE |
682 | spte = rmap_next(kvm, rmapp, NULL); |
683 | while (spte) { | |
374cbac0 | 684 | BUG_ON(!spte); |
374cbac0 | 685 | BUG_ON(!(*spte & PT_PRESENT_MASK)); |
374cbac0 | 686 | rmap_printk("rmap_write_protect: spte %p %llx\n", spte, *spte); |
8dae4445 | 687 | if (is_writable_pte(*spte)) { |
d555c333 | 688 | __set_spte(spte, *spte & ~PT_WRITABLE_MASK); |
caa5b8a5 ED |
689 | write_protected = 1; |
690 | } | |
9647c14c | 691 | spte = rmap_next(kvm, rmapp, spte); |
374cbac0 | 692 | } |
855149aa | 693 | if (write_protected) { |
35149e21 | 694 | pfn_t pfn; |
855149aa IE |
695 | |
696 | spte = rmap_next(kvm, rmapp, NULL); | |
35149e21 AL |
697 | pfn = spte_to_pfn(*spte); |
698 | kvm_set_pfn_dirty(pfn); | |
855149aa IE |
699 | } |
700 | ||
05da4558 | 701 | /* check for huge page mappings */ |
44ad9944 JR |
702 | for (i = PT_DIRECTORY_LEVEL; |
703 | i < PT_PAGE_TABLE_LEVEL + KVM_NR_PAGE_SIZES; ++i) { | |
704 | rmapp = gfn_to_rmap(kvm, gfn, i); | |
705 | spte = rmap_next(kvm, rmapp, NULL); | |
706 | while (spte) { | |
707 | BUG_ON(!spte); | |
708 | BUG_ON(!(*spte & PT_PRESENT_MASK)); | |
709 | BUG_ON((*spte & (PT_PAGE_SIZE_MASK|PT_PRESENT_MASK)) != (PT_PAGE_SIZE_MASK|PT_PRESENT_MASK)); | |
710 | pgprintk("rmap_write_protect(large): spte %p %llx %lld\n", spte, *spte, gfn); | |
8dae4445 | 711 | if (is_writable_pte(*spte)) { |
44ad9944 JR |
712 | rmap_remove(kvm, spte); |
713 | --kvm->stat.lpages; | |
714 | __set_spte(spte, shadow_trap_nonpresent_pte); | |
715 | spte = NULL; | |
716 | write_protected = 1; | |
717 | } | |
718 | spte = rmap_next(kvm, rmapp, spte); | |
05da4558 | 719 | } |
05da4558 MT |
720 | } |
721 | ||
b1a36821 | 722 | return write_protected; |
374cbac0 AK |
723 | } |
724 | ||
8a8365c5 FD |
725 | static int kvm_unmap_rmapp(struct kvm *kvm, unsigned long *rmapp, |
726 | unsigned long data) | |
e930bffe AA |
727 | { |
728 | u64 *spte; | |
729 | int need_tlb_flush = 0; | |
730 | ||
731 | while ((spte = rmap_next(kvm, rmapp, NULL))) { | |
732 | BUG_ON(!(*spte & PT_PRESENT_MASK)); | |
733 | rmap_printk("kvm_rmap_unmap_hva: spte %p %llx\n", spte, *spte); | |
734 | rmap_remove(kvm, spte); | |
d555c333 | 735 | __set_spte(spte, shadow_trap_nonpresent_pte); |
e930bffe AA |
736 | need_tlb_flush = 1; |
737 | } | |
738 | return need_tlb_flush; | |
739 | } | |
740 | ||
8a8365c5 FD |
741 | static int kvm_set_pte_rmapp(struct kvm *kvm, unsigned long *rmapp, |
742 | unsigned long data) | |
3da0dd43 IE |
743 | { |
744 | int need_flush = 0; | |
745 | u64 *spte, new_spte; | |
746 | pte_t *ptep = (pte_t *)data; | |
747 | pfn_t new_pfn; | |
748 | ||
749 | WARN_ON(pte_huge(*ptep)); | |
750 | new_pfn = pte_pfn(*ptep); | |
751 | spte = rmap_next(kvm, rmapp, NULL); | |
752 | while (spte) { | |
753 | BUG_ON(!is_shadow_present_pte(*spte)); | |
754 | rmap_printk("kvm_set_pte_rmapp: spte %p %llx\n", spte, *spte); | |
755 | need_flush = 1; | |
756 | if (pte_write(*ptep)) { | |
757 | rmap_remove(kvm, spte); | |
758 | __set_spte(spte, shadow_trap_nonpresent_pte); | |
759 | spte = rmap_next(kvm, rmapp, NULL); | |
760 | } else { | |
761 | new_spte = *spte &~ (PT64_BASE_ADDR_MASK); | |
762 | new_spte |= (u64)new_pfn << PAGE_SHIFT; | |
763 | ||
764 | new_spte &= ~PT_WRITABLE_MASK; | |
765 | new_spte &= ~SPTE_HOST_WRITEABLE; | |
8dae4445 | 766 | if (is_writable_pte(*spte)) |
3da0dd43 IE |
767 | kvm_set_pfn_dirty(spte_to_pfn(*spte)); |
768 | __set_spte(spte, new_spte); | |
769 | spte = rmap_next(kvm, rmapp, spte); | |
770 | } | |
771 | } | |
772 | if (need_flush) | |
773 | kvm_flush_remote_tlbs(kvm); | |
774 | ||
775 | return 0; | |
776 | } | |
777 | ||
8a8365c5 FD |
778 | static int kvm_handle_hva(struct kvm *kvm, unsigned long hva, |
779 | unsigned long data, | |
3da0dd43 | 780 | int (*handler)(struct kvm *kvm, unsigned long *rmapp, |
8a8365c5 | 781 | unsigned long data)) |
e930bffe | 782 | { |
852e3c19 | 783 | int i, j; |
90bb6fc5 | 784 | int ret; |
e930bffe | 785 | int retval = 0; |
bc6678a3 MT |
786 | struct kvm_memslots *slots; |
787 | ||
90d83dc3 | 788 | slots = kvm_memslots(kvm); |
e930bffe | 789 | |
46a26bf5 MT |
790 | for (i = 0; i < slots->nmemslots; i++) { |
791 | struct kvm_memory_slot *memslot = &slots->memslots[i]; | |
e930bffe AA |
792 | unsigned long start = memslot->userspace_addr; |
793 | unsigned long end; | |
794 | ||
e930bffe AA |
795 | end = start + (memslot->npages << PAGE_SHIFT); |
796 | if (hva >= start && hva < end) { | |
797 | gfn_t gfn_offset = (hva - start) >> PAGE_SHIFT; | |
852e3c19 | 798 | |
90bb6fc5 | 799 | ret = handler(kvm, &memslot->rmap[gfn_offset], data); |
852e3c19 JR |
800 | |
801 | for (j = 0; j < KVM_NR_PAGE_SIZES - 1; ++j) { | |
802 | int idx = gfn_offset; | |
803 | idx /= KVM_PAGES_PER_HPAGE(PT_DIRECTORY_LEVEL + j); | |
90bb6fc5 | 804 | ret |= handler(kvm, |
3da0dd43 IE |
805 | &memslot->lpage_info[j][idx].rmap_pde, |
806 | data); | |
852e3c19 | 807 | } |
90bb6fc5 AK |
808 | trace_kvm_age_page(hva, memslot, ret); |
809 | retval |= ret; | |
e930bffe AA |
810 | } |
811 | } | |
812 | ||
813 | return retval; | |
814 | } | |
815 | ||
816 | int kvm_unmap_hva(struct kvm *kvm, unsigned long hva) | |
817 | { | |
3da0dd43 IE |
818 | return kvm_handle_hva(kvm, hva, 0, kvm_unmap_rmapp); |
819 | } | |
820 | ||
821 | void kvm_set_spte_hva(struct kvm *kvm, unsigned long hva, pte_t pte) | |
822 | { | |
8a8365c5 | 823 | kvm_handle_hva(kvm, hva, (unsigned long)&pte, kvm_set_pte_rmapp); |
e930bffe AA |
824 | } |
825 | ||
8a8365c5 FD |
826 | static int kvm_age_rmapp(struct kvm *kvm, unsigned long *rmapp, |
827 | unsigned long data) | |
e930bffe AA |
828 | { |
829 | u64 *spte; | |
830 | int young = 0; | |
831 | ||
6316e1c8 RR |
832 | /* |
833 | * Emulate the accessed bit for EPT, by checking if this page has | |
834 | * an EPT mapping, and clearing it if it does. On the next access, | |
835 | * a new EPT mapping will be established. | |
836 | * This has some overhead, but not as much as the cost of swapping | |
837 | * out actively used pages or breaking up actively used hugepages. | |
838 | */ | |
534e38b4 | 839 | if (!shadow_accessed_mask) |
6316e1c8 | 840 | return kvm_unmap_rmapp(kvm, rmapp, data); |
534e38b4 | 841 | |
e930bffe AA |
842 | spte = rmap_next(kvm, rmapp, NULL); |
843 | while (spte) { | |
844 | int _young; | |
845 | u64 _spte = *spte; | |
846 | BUG_ON(!(_spte & PT_PRESENT_MASK)); | |
847 | _young = _spte & PT_ACCESSED_MASK; | |
848 | if (_young) { | |
849 | young = 1; | |
850 | clear_bit(PT_ACCESSED_SHIFT, (unsigned long *)spte); | |
851 | } | |
852 | spte = rmap_next(kvm, rmapp, spte); | |
853 | } | |
854 | return young; | |
855 | } | |
856 | ||
53a27b39 MT |
857 | #define RMAP_RECYCLE_THRESHOLD 1000 |
858 | ||
852e3c19 | 859 | static void rmap_recycle(struct kvm_vcpu *vcpu, u64 *spte, gfn_t gfn) |
53a27b39 MT |
860 | { |
861 | unsigned long *rmapp; | |
852e3c19 JR |
862 | struct kvm_mmu_page *sp; |
863 | ||
864 | sp = page_header(__pa(spte)); | |
53a27b39 MT |
865 | |
866 | gfn = unalias_gfn(vcpu->kvm, gfn); | |
852e3c19 | 867 | rmapp = gfn_to_rmap(vcpu->kvm, gfn, sp->role.level); |
53a27b39 | 868 | |
3da0dd43 | 869 | kvm_unmap_rmapp(vcpu->kvm, rmapp, 0); |
53a27b39 MT |
870 | kvm_flush_remote_tlbs(vcpu->kvm); |
871 | } | |
872 | ||
e930bffe AA |
873 | int kvm_age_hva(struct kvm *kvm, unsigned long hva) |
874 | { | |
3da0dd43 | 875 | return kvm_handle_hva(kvm, hva, 0, kvm_age_rmapp); |
e930bffe AA |
876 | } |
877 | ||
d6c69ee9 | 878 | #ifdef MMU_DEBUG |
47ad8e68 | 879 | static int is_empty_shadow_page(u64 *spt) |
6aa8b732 | 880 | { |
139bdb2d AK |
881 | u64 *pos; |
882 | u64 *end; | |
883 | ||
47ad8e68 | 884 | for (pos = spt, end = pos + PAGE_SIZE / sizeof(u64); pos != end; pos++) |
3c915510 | 885 | if (is_shadow_present_pte(*pos)) { |
b8688d51 | 886 | printk(KERN_ERR "%s: %p %llx\n", __func__, |
139bdb2d | 887 | pos, *pos); |
6aa8b732 | 888 | return 0; |
139bdb2d | 889 | } |
6aa8b732 AK |
890 | return 1; |
891 | } | |
d6c69ee9 | 892 | #endif |
6aa8b732 | 893 | |
4db35314 | 894 | static void kvm_mmu_free_page(struct kvm *kvm, struct kvm_mmu_page *sp) |
260746c0 | 895 | { |
4db35314 AK |
896 | ASSERT(is_empty_shadow_page(sp->spt)); |
897 | list_del(&sp->link); | |
898 | __free_page(virt_to_page(sp->spt)); | |
899 | __free_page(virt_to_page(sp->gfns)); | |
900 | kfree(sp); | |
f05e70ac | 901 | ++kvm->arch.n_free_mmu_pages; |
260746c0 AK |
902 | } |
903 | ||
cea0f0e7 AK |
904 | static unsigned kvm_page_table_hashfn(gfn_t gfn) |
905 | { | |
1ae0a13d | 906 | return gfn & ((1 << KVM_MMU_HASH_SHIFT) - 1); |
cea0f0e7 AK |
907 | } |
908 | ||
25c0de2c AK |
909 | static struct kvm_mmu_page *kvm_mmu_alloc_page(struct kvm_vcpu *vcpu, |
910 | u64 *parent_pte) | |
6aa8b732 | 911 | { |
4db35314 | 912 | struct kvm_mmu_page *sp; |
6aa8b732 | 913 | |
ad312c7c ZX |
914 | sp = mmu_memory_cache_alloc(&vcpu->arch.mmu_page_header_cache, sizeof *sp); |
915 | sp->spt = mmu_memory_cache_alloc(&vcpu->arch.mmu_page_cache, PAGE_SIZE); | |
916 | sp->gfns = mmu_memory_cache_alloc(&vcpu->arch.mmu_page_cache, PAGE_SIZE); | |
4db35314 | 917 | set_page_private(virt_to_page(sp->spt), (unsigned long)sp); |
f05e70ac | 918 | list_add(&sp->link, &vcpu->kvm->arch.active_mmu_pages); |
291f26bc | 919 | bitmap_zero(sp->slot_bitmap, KVM_MEMORY_SLOTS + KVM_PRIVATE_MEM_SLOTS); |
4db35314 AK |
920 | sp->multimapped = 0; |
921 | sp->parent_pte = parent_pte; | |
f05e70ac | 922 | --vcpu->kvm->arch.n_free_mmu_pages; |
4db35314 | 923 | return sp; |
6aa8b732 AK |
924 | } |
925 | ||
714b93da | 926 | static void mmu_page_add_parent_pte(struct kvm_vcpu *vcpu, |
4db35314 | 927 | struct kvm_mmu_page *sp, u64 *parent_pte) |
cea0f0e7 AK |
928 | { |
929 | struct kvm_pte_chain *pte_chain; | |
930 | struct hlist_node *node; | |
931 | int i; | |
932 | ||
933 | if (!parent_pte) | |
934 | return; | |
4db35314 AK |
935 | if (!sp->multimapped) { |
936 | u64 *old = sp->parent_pte; | |
cea0f0e7 AK |
937 | |
938 | if (!old) { | |
4db35314 | 939 | sp->parent_pte = parent_pte; |
cea0f0e7 AK |
940 | return; |
941 | } | |
4db35314 | 942 | sp->multimapped = 1; |
714b93da | 943 | pte_chain = mmu_alloc_pte_chain(vcpu); |
4db35314 AK |
944 | INIT_HLIST_HEAD(&sp->parent_ptes); |
945 | hlist_add_head(&pte_chain->link, &sp->parent_ptes); | |
cea0f0e7 AK |
946 | pte_chain->parent_ptes[0] = old; |
947 | } | |
4db35314 | 948 | hlist_for_each_entry(pte_chain, node, &sp->parent_ptes, link) { |
cea0f0e7 AK |
949 | if (pte_chain->parent_ptes[NR_PTE_CHAIN_ENTRIES-1]) |
950 | continue; | |
951 | for (i = 0; i < NR_PTE_CHAIN_ENTRIES; ++i) | |
952 | if (!pte_chain->parent_ptes[i]) { | |
953 | pte_chain->parent_ptes[i] = parent_pte; | |
954 | return; | |
955 | } | |
956 | } | |
714b93da | 957 | pte_chain = mmu_alloc_pte_chain(vcpu); |
cea0f0e7 | 958 | BUG_ON(!pte_chain); |
4db35314 | 959 | hlist_add_head(&pte_chain->link, &sp->parent_ptes); |
cea0f0e7 AK |
960 | pte_chain->parent_ptes[0] = parent_pte; |
961 | } | |
962 | ||
4db35314 | 963 | static void mmu_page_remove_parent_pte(struct kvm_mmu_page *sp, |
cea0f0e7 AK |
964 | u64 *parent_pte) |
965 | { | |
966 | struct kvm_pte_chain *pte_chain; | |
967 | struct hlist_node *node; | |
968 | int i; | |
969 | ||
4db35314 AK |
970 | if (!sp->multimapped) { |
971 | BUG_ON(sp->parent_pte != parent_pte); | |
972 | sp->parent_pte = NULL; | |
cea0f0e7 AK |
973 | return; |
974 | } | |
4db35314 | 975 | hlist_for_each_entry(pte_chain, node, &sp->parent_ptes, link) |
cea0f0e7 AK |
976 | for (i = 0; i < NR_PTE_CHAIN_ENTRIES; ++i) { |
977 | if (!pte_chain->parent_ptes[i]) | |
978 | break; | |
979 | if (pte_chain->parent_ptes[i] != parent_pte) | |
980 | continue; | |
697fe2e2 AK |
981 | while (i + 1 < NR_PTE_CHAIN_ENTRIES |
982 | && pte_chain->parent_ptes[i + 1]) { | |
cea0f0e7 AK |
983 | pte_chain->parent_ptes[i] |
984 | = pte_chain->parent_ptes[i + 1]; | |
985 | ++i; | |
986 | } | |
987 | pte_chain->parent_ptes[i] = NULL; | |
697fe2e2 AK |
988 | if (i == 0) { |
989 | hlist_del(&pte_chain->link); | |
90cb0529 | 990 | mmu_free_pte_chain(pte_chain); |
4db35314 AK |
991 | if (hlist_empty(&sp->parent_ptes)) { |
992 | sp->multimapped = 0; | |
993 | sp->parent_pte = NULL; | |
697fe2e2 AK |
994 | } |
995 | } | |
cea0f0e7 AK |
996 | return; |
997 | } | |
998 | BUG(); | |
999 | } | |
1000 | ||
ad8cfbe3 | 1001 | |
6b18493d | 1002 | static void mmu_parent_walk(struct kvm_mmu_page *sp, mmu_parent_walk_fn fn) |
ad8cfbe3 MT |
1003 | { |
1004 | struct kvm_pte_chain *pte_chain; | |
1005 | struct hlist_node *node; | |
1006 | struct kvm_mmu_page *parent_sp; | |
1007 | int i; | |
1008 | ||
1009 | if (!sp->multimapped && sp->parent_pte) { | |
1010 | parent_sp = page_header(__pa(sp->parent_pte)); | |
6b18493d XG |
1011 | fn(parent_sp); |
1012 | mmu_parent_walk(parent_sp, fn); | |
ad8cfbe3 MT |
1013 | return; |
1014 | } | |
1015 | hlist_for_each_entry(pte_chain, node, &sp->parent_ptes, link) | |
1016 | for (i = 0; i < NR_PTE_CHAIN_ENTRIES; ++i) { | |
1017 | if (!pte_chain->parent_ptes[i]) | |
1018 | break; | |
1019 | parent_sp = page_header(__pa(pte_chain->parent_ptes[i])); | |
6b18493d XG |
1020 | fn(parent_sp); |
1021 | mmu_parent_walk(parent_sp, fn); | |
ad8cfbe3 MT |
1022 | } |
1023 | } | |
1024 | ||
0074ff63 MT |
1025 | static void kvm_mmu_update_unsync_bitmap(u64 *spte) |
1026 | { | |
1027 | unsigned int index; | |
1028 | struct kvm_mmu_page *sp = page_header(__pa(spte)); | |
1029 | ||
1030 | index = spte - sp->spt; | |
60c8aec6 MT |
1031 | if (!__test_and_set_bit(index, sp->unsync_child_bitmap)) |
1032 | sp->unsync_children++; | |
1033 | WARN_ON(!sp->unsync_children); | |
0074ff63 MT |
1034 | } |
1035 | ||
1036 | static void kvm_mmu_update_parents_unsync(struct kvm_mmu_page *sp) | |
1037 | { | |
1038 | struct kvm_pte_chain *pte_chain; | |
1039 | struct hlist_node *node; | |
1040 | int i; | |
1041 | ||
1042 | if (!sp->parent_pte) | |
1043 | return; | |
1044 | ||
1045 | if (!sp->multimapped) { | |
1046 | kvm_mmu_update_unsync_bitmap(sp->parent_pte); | |
1047 | return; | |
1048 | } | |
1049 | ||
1050 | hlist_for_each_entry(pte_chain, node, &sp->parent_ptes, link) | |
1051 | for (i = 0; i < NR_PTE_CHAIN_ENTRIES; ++i) { | |
1052 | if (!pte_chain->parent_ptes[i]) | |
1053 | break; | |
1054 | kvm_mmu_update_unsync_bitmap(pte_chain->parent_ptes[i]); | |
1055 | } | |
1056 | } | |
1057 | ||
6b18493d | 1058 | static int unsync_walk_fn(struct kvm_mmu_page *sp) |
0074ff63 | 1059 | { |
0074ff63 MT |
1060 | kvm_mmu_update_parents_unsync(sp); |
1061 | return 1; | |
1062 | } | |
1063 | ||
6b18493d | 1064 | static void kvm_mmu_mark_parents_unsync(struct kvm_mmu_page *sp) |
0074ff63 | 1065 | { |
6b18493d | 1066 | mmu_parent_walk(sp, unsync_walk_fn); |
0074ff63 MT |
1067 | kvm_mmu_update_parents_unsync(sp); |
1068 | } | |
1069 | ||
d761a501 AK |
1070 | static void nonpaging_prefetch_page(struct kvm_vcpu *vcpu, |
1071 | struct kvm_mmu_page *sp) | |
1072 | { | |
1073 | int i; | |
1074 | ||
1075 | for (i = 0; i < PT64_ENT_PER_PAGE; ++i) | |
1076 | sp->spt[i] = shadow_trap_nonpresent_pte; | |
1077 | } | |
1078 | ||
e8bc217a MT |
1079 | static int nonpaging_sync_page(struct kvm_vcpu *vcpu, |
1080 | struct kvm_mmu_page *sp) | |
1081 | { | |
1082 | return 1; | |
1083 | } | |
1084 | ||
a7052897 MT |
1085 | static void nonpaging_invlpg(struct kvm_vcpu *vcpu, gva_t gva) |
1086 | { | |
1087 | } | |
1088 | ||
60c8aec6 MT |
1089 | #define KVM_PAGE_ARRAY_NR 16 |
1090 | ||
1091 | struct kvm_mmu_pages { | |
1092 | struct mmu_page_and_offset { | |
1093 | struct kvm_mmu_page *sp; | |
1094 | unsigned int idx; | |
1095 | } page[KVM_PAGE_ARRAY_NR]; | |
1096 | unsigned int nr; | |
1097 | }; | |
1098 | ||
0074ff63 MT |
1099 | #define for_each_unsync_children(bitmap, idx) \ |
1100 | for (idx = find_first_bit(bitmap, 512); \ | |
1101 | idx < 512; \ | |
1102 | idx = find_next_bit(bitmap, 512, idx+1)) | |
1103 | ||
cded19f3 HE |
1104 | static int mmu_pages_add(struct kvm_mmu_pages *pvec, struct kvm_mmu_page *sp, |
1105 | int idx) | |
4731d4c7 | 1106 | { |
60c8aec6 | 1107 | int i; |
4731d4c7 | 1108 | |
60c8aec6 MT |
1109 | if (sp->unsync) |
1110 | for (i=0; i < pvec->nr; i++) | |
1111 | if (pvec->page[i].sp == sp) | |
1112 | return 0; | |
1113 | ||
1114 | pvec->page[pvec->nr].sp = sp; | |
1115 | pvec->page[pvec->nr].idx = idx; | |
1116 | pvec->nr++; | |
1117 | return (pvec->nr == KVM_PAGE_ARRAY_NR); | |
1118 | } | |
1119 | ||
1120 | static int __mmu_unsync_walk(struct kvm_mmu_page *sp, | |
1121 | struct kvm_mmu_pages *pvec) | |
1122 | { | |
1123 | int i, ret, nr_unsync_leaf = 0; | |
4731d4c7 | 1124 | |
0074ff63 | 1125 | for_each_unsync_children(sp->unsync_child_bitmap, i) { |
4731d4c7 MT |
1126 | u64 ent = sp->spt[i]; |
1127 | ||
87917239 | 1128 | if (is_shadow_present_pte(ent) && !is_large_pte(ent)) { |
4731d4c7 MT |
1129 | struct kvm_mmu_page *child; |
1130 | child = page_header(ent & PT64_BASE_ADDR_MASK); | |
1131 | ||
1132 | if (child->unsync_children) { | |
60c8aec6 MT |
1133 | if (mmu_pages_add(pvec, child, i)) |
1134 | return -ENOSPC; | |
1135 | ||
1136 | ret = __mmu_unsync_walk(child, pvec); | |
1137 | if (!ret) | |
1138 | __clear_bit(i, sp->unsync_child_bitmap); | |
1139 | else if (ret > 0) | |
1140 | nr_unsync_leaf += ret; | |
1141 | else | |
4731d4c7 MT |
1142 | return ret; |
1143 | } | |
1144 | ||
1145 | if (child->unsync) { | |
60c8aec6 MT |
1146 | nr_unsync_leaf++; |
1147 | if (mmu_pages_add(pvec, child, i)) | |
1148 | return -ENOSPC; | |
4731d4c7 MT |
1149 | } |
1150 | } | |
1151 | } | |
1152 | ||
0074ff63 | 1153 | if (find_first_bit(sp->unsync_child_bitmap, 512) == 512) |
4731d4c7 MT |
1154 | sp->unsync_children = 0; |
1155 | ||
60c8aec6 MT |
1156 | return nr_unsync_leaf; |
1157 | } | |
1158 | ||
1159 | static int mmu_unsync_walk(struct kvm_mmu_page *sp, | |
1160 | struct kvm_mmu_pages *pvec) | |
1161 | { | |
1162 | if (!sp->unsync_children) | |
1163 | return 0; | |
1164 | ||
1165 | mmu_pages_add(pvec, sp, 0); | |
1166 | return __mmu_unsync_walk(sp, pvec); | |
4731d4c7 MT |
1167 | } |
1168 | ||
4db35314 | 1169 | static struct kvm_mmu_page *kvm_mmu_lookup_page(struct kvm *kvm, gfn_t gfn) |
cea0f0e7 AK |
1170 | { |
1171 | unsigned index; | |
1172 | struct hlist_head *bucket; | |
4db35314 | 1173 | struct kvm_mmu_page *sp; |
cea0f0e7 AK |
1174 | struct hlist_node *node; |
1175 | ||
b8688d51 | 1176 | pgprintk("%s: looking for gfn %lx\n", __func__, gfn); |
1ae0a13d | 1177 | index = kvm_page_table_hashfn(gfn); |
f05e70ac | 1178 | bucket = &kvm->arch.mmu_page_hash[index]; |
4db35314 | 1179 | hlist_for_each_entry(sp, node, bucket, hash_link) |
f6e2c02b | 1180 | if (sp->gfn == gfn && !sp->role.direct |
2e53d63a | 1181 | && !sp->role.invalid) { |
cea0f0e7 | 1182 | pgprintk("%s: found role %x\n", |
b8688d51 | 1183 | __func__, sp->role.word); |
4db35314 | 1184 | return sp; |
cea0f0e7 AK |
1185 | } |
1186 | return NULL; | |
1187 | } | |
1188 | ||
4731d4c7 MT |
1189 | static void kvm_unlink_unsync_page(struct kvm *kvm, struct kvm_mmu_page *sp) |
1190 | { | |
1191 | WARN_ON(!sp->unsync); | |
1192 | sp->unsync = 0; | |
1193 | --kvm->stat.mmu_unsync; | |
1194 | } | |
1195 | ||
1196 | static int kvm_mmu_zap_page(struct kvm *kvm, struct kvm_mmu_page *sp); | |
1197 | ||
1198 | static int kvm_sync_page(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp) | |
1199 | { | |
5b7e0102 | 1200 | if (sp->role.cr4_pae != !!is_pae(vcpu)) { |
4731d4c7 MT |
1201 | kvm_mmu_zap_page(vcpu->kvm, sp); |
1202 | return 1; | |
1203 | } | |
1204 | ||
f691fe1d | 1205 | trace_kvm_mmu_sync_page(sp); |
b1a36821 MT |
1206 | if (rmap_write_protect(vcpu->kvm, sp->gfn)) |
1207 | kvm_flush_remote_tlbs(vcpu->kvm); | |
0c0f40bd | 1208 | kvm_unlink_unsync_page(vcpu->kvm, sp); |
4731d4c7 MT |
1209 | if (vcpu->arch.mmu.sync_page(vcpu, sp)) { |
1210 | kvm_mmu_zap_page(vcpu->kvm, sp); | |
1211 | return 1; | |
1212 | } | |
1213 | ||
1214 | kvm_mmu_flush_tlb(vcpu); | |
4731d4c7 MT |
1215 | return 0; |
1216 | } | |
1217 | ||
60c8aec6 MT |
1218 | struct mmu_page_path { |
1219 | struct kvm_mmu_page *parent[PT64_ROOT_LEVEL-1]; | |
1220 | unsigned int idx[PT64_ROOT_LEVEL-1]; | |
4731d4c7 MT |
1221 | }; |
1222 | ||
60c8aec6 MT |
1223 | #define for_each_sp(pvec, sp, parents, i) \ |
1224 | for (i = mmu_pages_next(&pvec, &parents, -1), \ | |
1225 | sp = pvec.page[i].sp; \ | |
1226 | i < pvec.nr && ({ sp = pvec.page[i].sp; 1;}); \ | |
1227 | i = mmu_pages_next(&pvec, &parents, i)) | |
1228 | ||
cded19f3 HE |
1229 | static int mmu_pages_next(struct kvm_mmu_pages *pvec, |
1230 | struct mmu_page_path *parents, | |
1231 | int i) | |
60c8aec6 MT |
1232 | { |
1233 | int n; | |
1234 | ||
1235 | for (n = i+1; n < pvec->nr; n++) { | |
1236 | struct kvm_mmu_page *sp = pvec->page[n].sp; | |
1237 | ||
1238 | if (sp->role.level == PT_PAGE_TABLE_LEVEL) { | |
1239 | parents->idx[0] = pvec->page[n].idx; | |
1240 | return n; | |
1241 | } | |
1242 | ||
1243 | parents->parent[sp->role.level-2] = sp; | |
1244 | parents->idx[sp->role.level-1] = pvec->page[n].idx; | |
1245 | } | |
1246 | ||
1247 | return n; | |
1248 | } | |
1249 | ||
cded19f3 | 1250 | static void mmu_pages_clear_parents(struct mmu_page_path *parents) |
4731d4c7 | 1251 | { |
60c8aec6 MT |
1252 | struct kvm_mmu_page *sp; |
1253 | unsigned int level = 0; | |
1254 | ||
1255 | do { | |
1256 | unsigned int idx = parents->idx[level]; | |
4731d4c7 | 1257 | |
60c8aec6 MT |
1258 | sp = parents->parent[level]; |
1259 | if (!sp) | |
1260 | return; | |
1261 | ||
1262 | --sp->unsync_children; | |
1263 | WARN_ON((int)sp->unsync_children < 0); | |
1264 | __clear_bit(idx, sp->unsync_child_bitmap); | |
1265 | level++; | |
1266 | } while (level < PT64_ROOT_LEVEL-1 && !sp->unsync_children); | |
4731d4c7 MT |
1267 | } |
1268 | ||
60c8aec6 MT |
1269 | static void kvm_mmu_pages_init(struct kvm_mmu_page *parent, |
1270 | struct mmu_page_path *parents, | |
1271 | struct kvm_mmu_pages *pvec) | |
4731d4c7 | 1272 | { |
60c8aec6 MT |
1273 | parents->parent[parent->role.level-1] = NULL; |
1274 | pvec->nr = 0; | |
1275 | } | |
4731d4c7 | 1276 | |
60c8aec6 MT |
1277 | static void mmu_sync_children(struct kvm_vcpu *vcpu, |
1278 | struct kvm_mmu_page *parent) | |
1279 | { | |
1280 | int i; | |
1281 | struct kvm_mmu_page *sp; | |
1282 | struct mmu_page_path parents; | |
1283 | struct kvm_mmu_pages pages; | |
1284 | ||
1285 | kvm_mmu_pages_init(parent, &parents, &pages); | |
1286 | while (mmu_unsync_walk(parent, &pages)) { | |
b1a36821 MT |
1287 | int protected = 0; |
1288 | ||
1289 | for_each_sp(pages, sp, parents, i) | |
1290 | protected |= rmap_write_protect(vcpu->kvm, sp->gfn); | |
1291 | ||
1292 | if (protected) | |
1293 | kvm_flush_remote_tlbs(vcpu->kvm); | |
1294 | ||
60c8aec6 MT |
1295 | for_each_sp(pages, sp, parents, i) { |
1296 | kvm_sync_page(vcpu, sp); | |
1297 | mmu_pages_clear_parents(&parents); | |
1298 | } | |
4731d4c7 | 1299 | cond_resched_lock(&vcpu->kvm->mmu_lock); |
60c8aec6 MT |
1300 | kvm_mmu_pages_init(parent, &parents, &pages); |
1301 | } | |
4731d4c7 MT |
1302 | } |
1303 | ||
cea0f0e7 AK |
1304 | static struct kvm_mmu_page *kvm_mmu_get_page(struct kvm_vcpu *vcpu, |
1305 | gfn_t gfn, | |
1306 | gva_t gaddr, | |
1307 | unsigned level, | |
f6e2c02b | 1308 | int direct, |
41074d07 | 1309 | unsigned access, |
f7d9c7b7 | 1310 | u64 *parent_pte) |
cea0f0e7 AK |
1311 | { |
1312 | union kvm_mmu_page_role role; | |
1313 | unsigned index; | |
1314 | unsigned quadrant; | |
1315 | struct hlist_head *bucket; | |
4db35314 | 1316 | struct kvm_mmu_page *sp; |
4731d4c7 | 1317 | struct hlist_node *node, *tmp; |
cea0f0e7 | 1318 | |
a770f6f2 | 1319 | role = vcpu->arch.mmu.base_role; |
cea0f0e7 | 1320 | role.level = level; |
f6e2c02b | 1321 | role.direct = direct; |
84b0c8c6 | 1322 | if (role.direct) |
5b7e0102 | 1323 | role.cr4_pae = 0; |
41074d07 | 1324 | role.access = access; |
ad312c7c | 1325 | if (vcpu->arch.mmu.root_level <= PT32_ROOT_LEVEL) { |
cea0f0e7 AK |
1326 | quadrant = gaddr >> (PAGE_SHIFT + (PT64_PT_BITS * level)); |
1327 | quadrant &= (1 << ((PT32_PT_BITS - PT64_PT_BITS) * level)) - 1; | |
1328 | role.quadrant = quadrant; | |
1329 | } | |
1ae0a13d | 1330 | index = kvm_page_table_hashfn(gfn); |
f05e70ac | 1331 | bucket = &vcpu->kvm->arch.mmu_page_hash[index]; |
4731d4c7 MT |
1332 | hlist_for_each_entry_safe(sp, node, tmp, bucket, hash_link) |
1333 | if (sp->gfn == gfn) { | |
1334 | if (sp->unsync) | |
1335 | if (kvm_sync_page(vcpu, sp)) | |
1336 | continue; | |
1337 | ||
1338 | if (sp->role.word != role.word) | |
1339 | continue; | |
1340 | ||
4db35314 | 1341 | mmu_page_add_parent_pte(vcpu, sp, parent_pte); |
0074ff63 MT |
1342 | if (sp->unsync_children) { |
1343 | set_bit(KVM_REQ_MMU_SYNC, &vcpu->requests); | |
6b18493d | 1344 | kvm_mmu_mark_parents_unsync(sp); |
0074ff63 | 1345 | } |
f691fe1d | 1346 | trace_kvm_mmu_get_page(sp, false); |
4db35314 | 1347 | return sp; |
cea0f0e7 | 1348 | } |
dfc5aa00 | 1349 | ++vcpu->kvm->stat.mmu_cache_miss; |
4db35314 AK |
1350 | sp = kvm_mmu_alloc_page(vcpu, parent_pte); |
1351 | if (!sp) | |
1352 | return sp; | |
4db35314 AK |
1353 | sp->gfn = gfn; |
1354 | sp->role = role; | |
1355 | hlist_add_head(&sp->hash_link, bucket); | |
f6e2c02b | 1356 | if (!direct) { |
b1a36821 MT |
1357 | if (rmap_write_protect(vcpu->kvm, gfn)) |
1358 | kvm_flush_remote_tlbs(vcpu->kvm); | |
4731d4c7 MT |
1359 | account_shadowed(vcpu->kvm, gfn); |
1360 | } | |
131d8279 AK |
1361 | if (shadow_trap_nonpresent_pte != shadow_notrap_nonpresent_pte) |
1362 | vcpu->arch.mmu.prefetch_page(vcpu, sp); | |
1363 | else | |
1364 | nonpaging_prefetch_page(vcpu, sp); | |
f691fe1d | 1365 | trace_kvm_mmu_get_page(sp, true); |
4db35314 | 1366 | return sp; |
cea0f0e7 AK |
1367 | } |
1368 | ||
2d11123a AK |
1369 | static void shadow_walk_init(struct kvm_shadow_walk_iterator *iterator, |
1370 | struct kvm_vcpu *vcpu, u64 addr) | |
1371 | { | |
1372 | iterator->addr = addr; | |
1373 | iterator->shadow_addr = vcpu->arch.mmu.root_hpa; | |
1374 | iterator->level = vcpu->arch.mmu.shadow_root_level; | |
1375 | if (iterator->level == PT32E_ROOT_LEVEL) { | |
1376 | iterator->shadow_addr | |
1377 | = vcpu->arch.mmu.pae_root[(addr >> 30) & 3]; | |
1378 | iterator->shadow_addr &= PT64_BASE_ADDR_MASK; | |
1379 | --iterator->level; | |
1380 | if (!iterator->shadow_addr) | |
1381 | iterator->level = 0; | |
1382 | } | |
1383 | } | |
1384 | ||
1385 | static bool shadow_walk_okay(struct kvm_shadow_walk_iterator *iterator) | |
1386 | { | |
1387 | if (iterator->level < PT_PAGE_TABLE_LEVEL) | |
1388 | return false; | |
4d88954d MT |
1389 | |
1390 | if (iterator->level == PT_PAGE_TABLE_LEVEL) | |
1391 | if (is_large_pte(*iterator->sptep)) | |
1392 | return false; | |
1393 | ||
2d11123a AK |
1394 | iterator->index = SHADOW_PT_INDEX(iterator->addr, iterator->level); |
1395 | iterator->sptep = ((u64 *)__va(iterator->shadow_addr)) + iterator->index; | |
1396 | return true; | |
1397 | } | |
1398 | ||
1399 | static void shadow_walk_next(struct kvm_shadow_walk_iterator *iterator) | |
1400 | { | |
1401 | iterator->shadow_addr = *iterator->sptep & PT64_BASE_ADDR_MASK; | |
1402 | --iterator->level; | |
1403 | } | |
1404 | ||
90cb0529 | 1405 | static void kvm_mmu_page_unlink_children(struct kvm *kvm, |
4db35314 | 1406 | struct kvm_mmu_page *sp) |
a436036b | 1407 | { |
697fe2e2 AK |
1408 | unsigned i; |
1409 | u64 *pt; | |
1410 | u64 ent; | |
1411 | ||
4db35314 | 1412 | pt = sp->spt; |
697fe2e2 | 1413 | |
697fe2e2 AK |
1414 | for (i = 0; i < PT64_ENT_PER_PAGE; ++i) { |
1415 | ent = pt[i]; | |
1416 | ||
05da4558 | 1417 | if (is_shadow_present_pte(ent)) { |
776e6633 | 1418 | if (!is_last_spte(ent, sp->role.level)) { |
05da4558 MT |
1419 | ent &= PT64_BASE_ADDR_MASK; |
1420 | mmu_page_remove_parent_pte(page_header(ent), | |
1421 | &pt[i]); | |
1422 | } else { | |
776e6633 MT |
1423 | if (is_large_pte(ent)) |
1424 | --kvm->stat.lpages; | |
05da4558 MT |
1425 | rmap_remove(kvm, &pt[i]); |
1426 | } | |
1427 | } | |
c7addb90 | 1428 | pt[i] = shadow_trap_nonpresent_pte; |
697fe2e2 | 1429 | } |
a436036b AK |
1430 | } |
1431 | ||
4db35314 | 1432 | static void kvm_mmu_put_page(struct kvm_mmu_page *sp, u64 *parent_pte) |
cea0f0e7 | 1433 | { |
4db35314 | 1434 | mmu_page_remove_parent_pte(sp, parent_pte); |
a436036b AK |
1435 | } |
1436 | ||
12b7d28f AK |
1437 | static void kvm_mmu_reset_last_pte_updated(struct kvm *kvm) |
1438 | { | |
1439 | int i; | |
988a2cae | 1440 | struct kvm_vcpu *vcpu; |
12b7d28f | 1441 | |
988a2cae GN |
1442 | kvm_for_each_vcpu(i, vcpu, kvm) |
1443 | vcpu->arch.last_pte_updated = NULL; | |
12b7d28f AK |
1444 | } |
1445 | ||
31aa2b44 | 1446 | static void kvm_mmu_unlink_parents(struct kvm *kvm, struct kvm_mmu_page *sp) |
a436036b AK |
1447 | { |
1448 | u64 *parent_pte; | |
1449 | ||
4db35314 AK |
1450 | while (sp->multimapped || sp->parent_pte) { |
1451 | if (!sp->multimapped) | |
1452 | parent_pte = sp->parent_pte; | |
a436036b AK |
1453 | else { |
1454 | struct kvm_pte_chain *chain; | |
1455 | ||
4db35314 | 1456 | chain = container_of(sp->parent_ptes.first, |
a436036b AK |
1457 | struct kvm_pte_chain, link); |
1458 | parent_pte = chain->parent_ptes[0]; | |
1459 | } | |
697fe2e2 | 1460 | BUG_ON(!parent_pte); |
4db35314 | 1461 | kvm_mmu_put_page(sp, parent_pte); |
d555c333 | 1462 | __set_spte(parent_pte, shadow_trap_nonpresent_pte); |
a436036b | 1463 | } |
31aa2b44 AK |
1464 | } |
1465 | ||
60c8aec6 MT |
1466 | static int mmu_zap_unsync_children(struct kvm *kvm, |
1467 | struct kvm_mmu_page *parent) | |
4731d4c7 | 1468 | { |
60c8aec6 MT |
1469 | int i, zapped = 0; |
1470 | struct mmu_page_path parents; | |
1471 | struct kvm_mmu_pages pages; | |
4731d4c7 | 1472 | |
60c8aec6 | 1473 | if (parent->role.level == PT_PAGE_TABLE_LEVEL) |
4731d4c7 | 1474 | return 0; |
60c8aec6 MT |
1475 | |
1476 | kvm_mmu_pages_init(parent, &parents, &pages); | |
1477 | while (mmu_unsync_walk(parent, &pages)) { | |
1478 | struct kvm_mmu_page *sp; | |
1479 | ||
1480 | for_each_sp(pages, sp, parents, i) { | |
1481 | kvm_mmu_zap_page(kvm, sp); | |
1482 | mmu_pages_clear_parents(&parents); | |
77662e00 | 1483 | zapped++; |
60c8aec6 | 1484 | } |
60c8aec6 MT |
1485 | kvm_mmu_pages_init(parent, &parents, &pages); |
1486 | } | |
1487 | ||
1488 | return zapped; | |
4731d4c7 MT |
1489 | } |
1490 | ||
07385413 | 1491 | static int kvm_mmu_zap_page(struct kvm *kvm, struct kvm_mmu_page *sp) |
31aa2b44 | 1492 | { |
4731d4c7 | 1493 | int ret; |
f691fe1d AK |
1494 | |
1495 | trace_kvm_mmu_zap_page(sp); | |
31aa2b44 | 1496 | ++kvm->stat.mmu_shadow_zapped; |
4731d4c7 | 1497 | ret = mmu_zap_unsync_children(kvm, sp); |
4db35314 | 1498 | kvm_mmu_page_unlink_children(kvm, sp); |
31aa2b44 | 1499 | kvm_mmu_unlink_parents(kvm, sp); |
5b5c6a5a | 1500 | kvm_flush_remote_tlbs(kvm); |
f6e2c02b | 1501 | if (!sp->role.invalid && !sp->role.direct) |
5b5c6a5a | 1502 | unaccount_shadowed(kvm, sp->gfn); |
4731d4c7 MT |
1503 | if (sp->unsync) |
1504 | kvm_unlink_unsync_page(kvm, sp); | |
4db35314 AK |
1505 | if (!sp->root_count) { |
1506 | hlist_del(&sp->hash_link); | |
1507 | kvm_mmu_free_page(kvm, sp); | |
2e53d63a | 1508 | } else { |
2e53d63a | 1509 | sp->role.invalid = 1; |
5b5c6a5a | 1510 | list_move(&sp->link, &kvm->arch.active_mmu_pages); |
2e53d63a MT |
1511 | kvm_reload_remote_mmus(kvm); |
1512 | } | |
12b7d28f | 1513 | kvm_mmu_reset_last_pte_updated(kvm); |
4731d4c7 | 1514 | return ret; |
a436036b AK |
1515 | } |
1516 | ||
82ce2c96 IE |
1517 | /* |
1518 | * Changing the number of mmu pages allocated to the vm | |
1519 | * Note: if kvm_nr_mmu_pages is too small, you will get dead lock | |
1520 | */ | |
1521 | void kvm_mmu_change_mmu_pages(struct kvm *kvm, unsigned int kvm_nr_mmu_pages) | |
1522 | { | |
025dbbf3 MT |
1523 | int used_pages; |
1524 | ||
1525 | used_pages = kvm->arch.n_alloc_mmu_pages - kvm->arch.n_free_mmu_pages; | |
1526 | used_pages = max(0, used_pages); | |
1527 | ||
82ce2c96 IE |
1528 | /* |
1529 | * If we set the number of mmu pages to be smaller be than the | |
1530 | * number of actived pages , we must to free some mmu pages before we | |
1531 | * change the value | |
1532 | */ | |
1533 | ||
025dbbf3 | 1534 | if (used_pages > kvm_nr_mmu_pages) { |
77662e00 XG |
1535 | while (used_pages > kvm_nr_mmu_pages && |
1536 | !list_empty(&kvm->arch.active_mmu_pages)) { | |
82ce2c96 IE |
1537 | struct kvm_mmu_page *page; |
1538 | ||
f05e70ac | 1539 | page = container_of(kvm->arch.active_mmu_pages.prev, |
82ce2c96 | 1540 | struct kvm_mmu_page, link); |
77662e00 | 1541 | used_pages -= kvm_mmu_zap_page(kvm, page); |
025dbbf3 | 1542 | used_pages--; |
82ce2c96 | 1543 | } |
77662e00 | 1544 | kvm_nr_mmu_pages = used_pages; |
f05e70ac | 1545 | kvm->arch.n_free_mmu_pages = 0; |
82ce2c96 IE |
1546 | } |
1547 | else | |
f05e70ac ZX |
1548 | kvm->arch.n_free_mmu_pages += kvm_nr_mmu_pages |
1549 | - kvm->arch.n_alloc_mmu_pages; | |
82ce2c96 | 1550 | |
f05e70ac | 1551 | kvm->arch.n_alloc_mmu_pages = kvm_nr_mmu_pages; |
82ce2c96 IE |
1552 | } |
1553 | ||
f67a46f4 | 1554 | static int kvm_mmu_unprotect_page(struct kvm *kvm, gfn_t gfn) |
a436036b AK |
1555 | { |
1556 | unsigned index; | |
1557 | struct hlist_head *bucket; | |
4db35314 | 1558 | struct kvm_mmu_page *sp; |
a436036b AK |
1559 | struct hlist_node *node, *n; |
1560 | int r; | |
1561 | ||
b8688d51 | 1562 | pgprintk("%s: looking for gfn %lx\n", __func__, gfn); |
a436036b | 1563 | r = 0; |
1ae0a13d | 1564 | index = kvm_page_table_hashfn(gfn); |
f05e70ac | 1565 | bucket = &kvm->arch.mmu_page_hash[index]; |
3246af0e | 1566 | restart: |
4db35314 | 1567 | hlist_for_each_entry_safe(sp, node, n, bucket, hash_link) |
f6e2c02b | 1568 | if (sp->gfn == gfn && !sp->role.direct) { |
b8688d51 | 1569 | pgprintk("%s: gfn %lx role %x\n", __func__, gfn, |
4db35314 | 1570 | sp->role.word); |
a436036b | 1571 | r = 1; |
07385413 | 1572 | if (kvm_mmu_zap_page(kvm, sp)) |
3246af0e | 1573 | goto restart; |
a436036b AK |
1574 | } |
1575 | return r; | |
cea0f0e7 AK |
1576 | } |
1577 | ||
f67a46f4 | 1578 | static void mmu_unshadow(struct kvm *kvm, gfn_t gfn) |
97a0a01e | 1579 | { |
4677a3b6 AK |
1580 | unsigned index; |
1581 | struct hlist_head *bucket; | |
4db35314 | 1582 | struct kvm_mmu_page *sp; |
4677a3b6 | 1583 | struct hlist_node *node, *nn; |
97a0a01e | 1584 | |
4677a3b6 AK |
1585 | index = kvm_page_table_hashfn(gfn); |
1586 | bucket = &kvm->arch.mmu_page_hash[index]; | |
3246af0e | 1587 | restart: |
4677a3b6 | 1588 | hlist_for_each_entry_safe(sp, node, nn, bucket, hash_link) { |
f6e2c02b | 1589 | if (sp->gfn == gfn && !sp->role.direct |
4677a3b6 AK |
1590 | && !sp->role.invalid) { |
1591 | pgprintk("%s: zap %lx %x\n", | |
1592 | __func__, gfn, sp->role.word); | |
77662e00 | 1593 | if (kvm_mmu_zap_page(kvm, sp)) |
3246af0e | 1594 | goto restart; |
4677a3b6 | 1595 | } |
97a0a01e AK |
1596 | } |
1597 | } | |
1598 | ||
38c335f1 | 1599 | static void page_header_update_slot(struct kvm *kvm, void *pte, gfn_t gfn) |
6aa8b732 | 1600 | { |
bc6678a3 | 1601 | int slot = memslot_id(kvm, gfn); |
4db35314 | 1602 | struct kvm_mmu_page *sp = page_header(__pa(pte)); |
6aa8b732 | 1603 | |
291f26bc | 1604 | __set_bit(slot, sp->slot_bitmap); |
6aa8b732 AK |
1605 | } |
1606 | ||
6844dec6 MT |
1607 | static void mmu_convert_notrap(struct kvm_mmu_page *sp) |
1608 | { | |
1609 | int i; | |
1610 | u64 *pt = sp->spt; | |
1611 | ||
1612 | if (shadow_trap_nonpresent_pte == shadow_notrap_nonpresent_pte) | |
1613 | return; | |
1614 | ||
1615 | for (i = 0; i < PT64_ENT_PER_PAGE; ++i) { | |
1616 | if (pt[i] == shadow_notrap_nonpresent_pte) | |
d555c333 | 1617 | __set_spte(&pt[i], shadow_trap_nonpresent_pte); |
6844dec6 MT |
1618 | } |
1619 | } | |
1620 | ||
74be52e3 SY |
1621 | /* |
1622 | * The function is based on mtrr_type_lookup() in | |
1623 | * arch/x86/kernel/cpu/mtrr/generic.c | |
1624 | */ | |
1625 | static int get_mtrr_type(struct mtrr_state_type *mtrr_state, | |
1626 | u64 start, u64 end) | |
1627 | { | |
1628 | int i; | |
1629 | u64 base, mask; | |
1630 | u8 prev_match, curr_match; | |
1631 | int num_var_ranges = KVM_NR_VAR_MTRR; | |
1632 | ||
1633 | if (!mtrr_state->enabled) | |
1634 | return 0xFF; | |
1635 | ||
1636 | /* Make end inclusive end, instead of exclusive */ | |
1637 | end--; | |
1638 | ||
1639 | /* Look in fixed ranges. Just return the type as per start */ | |
1640 | if (mtrr_state->have_fixed && (start < 0x100000)) { | |
1641 | int idx; | |
1642 | ||
1643 | if (start < 0x80000) { | |
1644 | idx = 0; | |
1645 | idx += (start >> 16); | |
1646 | return mtrr_state->fixed_ranges[idx]; | |
1647 | } else if (start < 0xC0000) { | |
1648 | idx = 1 * 8; | |
1649 | idx += ((start - 0x80000) >> 14); | |
1650 | return mtrr_state->fixed_ranges[idx]; | |
1651 | } else if (start < 0x1000000) { | |
1652 | idx = 3 * 8; | |
1653 | idx += ((start - 0xC0000) >> 12); | |
1654 | return mtrr_state->fixed_ranges[idx]; | |
1655 | } | |
1656 | } | |
1657 | ||
1658 | /* | |
1659 | * Look in variable ranges | |
1660 | * Look of multiple ranges matching this address and pick type | |
1661 | * as per MTRR precedence | |
1662 | */ | |
1663 | if (!(mtrr_state->enabled & 2)) | |
1664 | return mtrr_state->def_type; | |
1665 | ||
1666 | prev_match = 0xFF; | |
1667 | for (i = 0; i < num_var_ranges; ++i) { | |
1668 | unsigned short start_state, end_state; | |
1669 | ||
1670 | if (!(mtrr_state->var_ranges[i].mask_lo & (1 << 11))) | |
1671 | continue; | |
1672 | ||
1673 | base = (((u64)mtrr_state->var_ranges[i].base_hi) << 32) + | |
1674 | (mtrr_state->var_ranges[i].base_lo & PAGE_MASK); | |
1675 | mask = (((u64)mtrr_state->var_ranges[i].mask_hi) << 32) + | |
1676 | (mtrr_state->var_ranges[i].mask_lo & PAGE_MASK); | |
1677 | ||
1678 | start_state = ((start & mask) == (base & mask)); | |
1679 | end_state = ((end & mask) == (base & mask)); | |
1680 | if (start_state != end_state) | |
1681 | return 0xFE; | |
1682 | ||
1683 | if ((start & mask) != (base & mask)) | |
1684 | continue; | |
1685 | ||
1686 | curr_match = mtrr_state->var_ranges[i].base_lo & 0xff; | |
1687 | if (prev_match == 0xFF) { | |
1688 | prev_match = curr_match; | |
1689 | continue; | |
1690 | } | |
1691 | ||
1692 | if (prev_match == MTRR_TYPE_UNCACHABLE || | |
1693 | curr_match == MTRR_TYPE_UNCACHABLE) | |
1694 | return MTRR_TYPE_UNCACHABLE; | |
1695 | ||
1696 | if ((prev_match == MTRR_TYPE_WRBACK && | |
1697 | curr_match == MTRR_TYPE_WRTHROUGH) || | |
1698 | (prev_match == MTRR_TYPE_WRTHROUGH && | |
1699 | curr_match == MTRR_TYPE_WRBACK)) { | |
1700 | prev_match = MTRR_TYPE_WRTHROUGH; | |
1701 | curr_match = MTRR_TYPE_WRTHROUGH; | |
1702 | } | |
1703 | ||
1704 | if (prev_match != curr_match) | |
1705 | return MTRR_TYPE_UNCACHABLE; | |
1706 | } | |
1707 | ||
1708 | if (prev_match != 0xFF) | |
1709 | return prev_match; | |
1710 | ||
1711 | return mtrr_state->def_type; | |
1712 | } | |
1713 | ||
4b12f0de | 1714 | u8 kvm_get_guest_memory_type(struct kvm_vcpu *vcpu, gfn_t gfn) |
74be52e3 SY |
1715 | { |
1716 | u8 mtrr; | |
1717 | ||
1718 | mtrr = get_mtrr_type(&vcpu->arch.mtrr_state, gfn << PAGE_SHIFT, | |
1719 | (gfn << PAGE_SHIFT) + PAGE_SIZE); | |
1720 | if (mtrr == 0xfe || mtrr == 0xff) | |
1721 | mtrr = MTRR_TYPE_WRBACK; | |
1722 | return mtrr; | |
1723 | } | |
4b12f0de | 1724 | EXPORT_SYMBOL_GPL(kvm_get_guest_memory_type); |
74be52e3 | 1725 | |
4731d4c7 MT |
1726 | static int kvm_unsync_page(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp) |
1727 | { | |
1728 | unsigned index; | |
1729 | struct hlist_head *bucket; | |
1730 | struct kvm_mmu_page *s; | |
1731 | struct hlist_node *node, *n; | |
1732 | ||
f691fe1d | 1733 | trace_kvm_mmu_unsync_page(sp); |
4731d4c7 MT |
1734 | index = kvm_page_table_hashfn(sp->gfn); |
1735 | bucket = &vcpu->kvm->arch.mmu_page_hash[index]; | |
1736 | /* don't unsync if pagetable is shadowed with multiple roles */ | |
1737 | hlist_for_each_entry_safe(s, node, n, bucket, hash_link) { | |
f6e2c02b | 1738 | if (s->gfn != sp->gfn || s->role.direct) |
4731d4c7 MT |
1739 | continue; |
1740 | if (s->role.word != sp->role.word) | |
1741 | return 1; | |
1742 | } | |
4731d4c7 MT |
1743 | ++vcpu->kvm->stat.mmu_unsync; |
1744 | sp->unsync = 1; | |
6cffe8ca | 1745 | |
6b18493d | 1746 | kvm_mmu_mark_parents_unsync(sp); |
6cffe8ca | 1747 | |
4731d4c7 MT |
1748 | mmu_convert_notrap(sp); |
1749 | return 0; | |
1750 | } | |
1751 | ||
1752 | static int mmu_need_write_protect(struct kvm_vcpu *vcpu, gfn_t gfn, | |
1753 | bool can_unsync) | |
1754 | { | |
1755 | struct kvm_mmu_page *shadow; | |
1756 | ||
1757 | shadow = kvm_mmu_lookup_page(vcpu->kvm, gfn); | |
1758 | if (shadow) { | |
1759 | if (shadow->role.level != PT_PAGE_TABLE_LEVEL) | |
1760 | return 1; | |
1761 | if (shadow->unsync) | |
1762 | return 0; | |
582801a9 | 1763 | if (can_unsync && oos_shadow) |
4731d4c7 MT |
1764 | return kvm_unsync_page(vcpu, shadow); |
1765 | return 1; | |
1766 | } | |
1767 | return 0; | |
1768 | } | |
1769 | ||
d555c333 | 1770 | static int set_spte(struct kvm_vcpu *vcpu, u64 *sptep, |
1e73f9dd | 1771 | unsigned pte_access, int user_fault, |
852e3c19 | 1772 | int write_fault, int dirty, int level, |
c2d0ee46 | 1773 | gfn_t gfn, pfn_t pfn, bool speculative, |
1403283a | 1774 | bool can_unsync, bool reset_host_protection) |
1c4f1fd6 AK |
1775 | { |
1776 | u64 spte; | |
1e73f9dd | 1777 | int ret = 0; |
64d4d521 | 1778 | |
1c4f1fd6 AK |
1779 | /* |
1780 | * We don't set the accessed bit, since we sometimes want to see | |
1781 | * whether the guest actually used the pte (in order to detect | |
1782 | * demand paging). | |
1783 | */ | |
7b52345e | 1784 | spte = shadow_base_present_pte | shadow_dirty_mask; |
947da538 | 1785 | if (!speculative) |
3201b5d9 | 1786 | spte |= shadow_accessed_mask; |
1c4f1fd6 AK |
1787 | if (!dirty) |
1788 | pte_access &= ~ACC_WRITE_MASK; | |
7b52345e SY |
1789 | if (pte_access & ACC_EXEC_MASK) |
1790 | spte |= shadow_x_mask; | |
1791 | else | |
1792 | spte |= shadow_nx_mask; | |
1c4f1fd6 | 1793 | if (pte_access & ACC_USER_MASK) |
7b52345e | 1794 | spte |= shadow_user_mask; |
852e3c19 | 1795 | if (level > PT_PAGE_TABLE_LEVEL) |
05da4558 | 1796 | spte |= PT_PAGE_SIZE_MASK; |
4b12f0de SY |
1797 | if (tdp_enabled) |
1798 | spte |= kvm_x86_ops->get_mt_mask(vcpu, gfn, | |
1799 | kvm_is_mmio_pfn(pfn)); | |
1c4f1fd6 | 1800 | |
1403283a IE |
1801 | if (reset_host_protection) |
1802 | spte |= SPTE_HOST_WRITEABLE; | |
1803 | ||
35149e21 | 1804 | spte |= (u64)pfn << PAGE_SHIFT; |
1c4f1fd6 AK |
1805 | |
1806 | if ((pte_access & ACC_WRITE_MASK) | |
1807 | || (write_fault && !is_write_protection(vcpu) && !user_fault)) { | |
1c4f1fd6 | 1808 | |
852e3c19 JR |
1809 | if (level > PT_PAGE_TABLE_LEVEL && |
1810 | has_wrprotected_page(vcpu->kvm, gfn, level)) { | |
38187c83 MT |
1811 | ret = 1; |
1812 | spte = shadow_trap_nonpresent_pte; | |
1813 | goto set_pte; | |
1814 | } | |
1815 | ||
1c4f1fd6 | 1816 | spte |= PT_WRITABLE_MASK; |
1c4f1fd6 | 1817 | |
ecc5589f MT |
1818 | /* |
1819 | * Optimization: for pte sync, if spte was writable the hash | |
1820 | * lookup is unnecessary (and expensive). Write protection | |
1821 | * is responsibility of mmu_get_page / kvm_sync_page. | |
1822 | * Same reasoning can be applied to dirty page accounting. | |
1823 | */ | |
8dae4445 | 1824 | if (!can_unsync && is_writable_pte(*sptep)) |
ecc5589f MT |
1825 | goto set_pte; |
1826 | ||
4731d4c7 | 1827 | if (mmu_need_write_protect(vcpu, gfn, can_unsync)) { |
1c4f1fd6 | 1828 | pgprintk("%s: found shadow page for %lx, marking ro\n", |
b8688d51 | 1829 | __func__, gfn); |
1e73f9dd | 1830 | ret = 1; |
1c4f1fd6 | 1831 | pte_access &= ~ACC_WRITE_MASK; |
8dae4445 | 1832 | if (is_writable_pte(spte)) |
1c4f1fd6 | 1833 | spte &= ~PT_WRITABLE_MASK; |
1c4f1fd6 AK |
1834 | } |
1835 | } | |
1836 | ||
1c4f1fd6 AK |
1837 | if (pte_access & ACC_WRITE_MASK) |
1838 | mark_page_dirty(vcpu->kvm, gfn); | |
1839 | ||
38187c83 | 1840 | set_pte: |
d555c333 | 1841 | __set_spte(sptep, spte); |
1e73f9dd MT |
1842 | return ret; |
1843 | } | |
1844 | ||
d555c333 | 1845 | static void mmu_set_spte(struct kvm_vcpu *vcpu, u64 *sptep, |
1e73f9dd MT |
1846 | unsigned pt_access, unsigned pte_access, |
1847 | int user_fault, int write_fault, int dirty, | |
852e3c19 | 1848 | int *ptwrite, int level, gfn_t gfn, |
1403283a IE |
1849 | pfn_t pfn, bool speculative, |
1850 | bool reset_host_protection) | |
1e73f9dd MT |
1851 | { |
1852 | int was_rmapped = 0; | |
8dae4445 | 1853 | int was_writable = is_writable_pte(*sptep); |
53a27b39 | 1854 | int rmap_count; |
1e73f9dd MT |
1855 | |
1856 | pgprintk("%s: spte %llx access %x write_fault %d" | |
1857 | " user_fault %d gfn %lx\n", | |
d555c333 | 1858 | __func__, *sptep, pt_access, |
1e73f9dd MT |
1859 | write_fault, user_fault, gfn); |
1860 | ||
d555c333 | 1861 | if (is_rmap_spte(*sptep)) { |
1e73f9dd MT |
1862 | /* |
1863 | * If we overwrite a PTE page pointer with a 2MB PMD, unlink | |
1864 | * the parent of the now unreachable PTE. | |
1865 | */ | |
852e3c19 JR |
1866 | if (level > PT_PAGE_TABLE_LEVEL && |
1867 | !is_large_pte(*sptep)) { | |
1e73f9dd | 1868 | struct kvm_mmu_page *child; |
d555c333 | 1869 | u64 pte = *sptep; |
1e73f9dd MT |
1870 | |
1871 | child = page_header(pte & PT64_BASE_ADDR_MASK); | |
d555c333 AK |
1872 | mmu_page_remove_parent_pte(child, sptep); |
1873 | } else if (pfn != spte_to_pfn(*sptep)) { | |
1e73f9dd | 1874 | pgprintk("hfn old %lx new %lx\n", |
d555c333 AK |
1875 | spte_to_pfn(*sptep), pfn); |
1876 | rmap_remove(vcpu->kvm, sptep); | |
6bed6b9e JR |
1877 | } else |
1878 | was_rmapped = 1; | |
1e73f9dd | 1879 | } |
852e3c19 | 1880 | |
d555c333 | 1881 | if (set_spte(vcpu, sptep, pte_access, user_fault, write_fault, |
1403283a IE |
1882 | dirty, level, gfn, pfn, speculative, true, |
1883 | reset_host_protection)) { | |
1e73f9dd MT |
1884 | if (write_fault) |
1885 | *ptwrite = 1; | |
a378b4e6 MT |
1886 | kvm_x86_ops->tlb_flush(vcpu); |
1887 | } | |
1e73f9dd | 1888 | |
d555c333 | 1889 | pgprintk("%s: setting spte %llx\n", __func__, *sptep); |
1e73f9dd | 1890 | pgprintk("instantiating %s PTE (%s) at %ld (%llx) addr %p\n", |
d555c333 | 1891 | is_large_pte(*sptep)? "2MB" : "4kB", |
a205bc19 JR |
1892 | *sptep & PT_PRESENT_MASK ?"RW":"R", gfn, |
1893 | *sptep, sptep); | |
d555c333 | 1894 | if (!was_rmapped && is_large_pte(*sptep)) |
05da4558 MT |
1895 | ++vcpu->kvm->stat.lpages; |
1896 | ||
d555c333 | 1897 | page_header_update_slot(vcpu->kvm, sptep, gfn); |
1c4f1fd6 | 1898 | if (!was_rmapped) { |
44ad9944 | 1899 | rmap_count = rmap_add(vcpu, sptep, gfn); |
acb66dd0 | 1900 | kvm_release_pfn_clean(pfn); |
53a27b39 | 1901 | if (rmap_count > RMAP_RECYCLE_THRESHOLD) |
852e3c19 | 1902 | rmap_recycle(vcpu, sptep, gfn); |
75e68e60 | 1903 | } else { |
8dae4445 | 1904 | if (was_writable) |
35149e21 | 1905 | kvm_release_pfn_dirty(pfn); |
75e68e60 | 1906 | else |
35149e21 | 1907 | kvm_release_pfn_clean(pfn); |
1c4f1fd6 | 1908 | } |
1b7fcd32 | 1909 | if (speculative) { |
d555c333 | 1910 | vcpu->arch.last_pte_updated = sptep; |
1b7fcd32 AK |
1911 | vcpu->arch.last_pte_gfn = gfn; |
1912 | } | |
1c4f1fd6 AK |
1913 | } |
1914 | ||
6aa8b732 AK |
1915 | static void nonpaging_new_cr3(struct kvm_vcpu *vcpu) |
1916 | { | |
1917 | } | |
1918 | ||
9f652d21 | 1919 | static int __direct_map(struct kvm_vcpu *vcpu, gpa_t v, int write, |
852e3c19 | 1920 | int level, gfn_t gfn, pfn_t pfn) |
140754bc | 1921 | { |
9f652d21 | 1922 | struct kvm_shadow_walk_iterator iterator; |
140754bc | 1923 | struct kvm_mmu_page *sp; |
9f652d21 | 1924 | int pt_write = 0; |
140754bc | 1925 | gfn_t pseudo_gfn; |
6aa8b732 | 1926 | |
9f652d21 | 1927 | for_each_shadow_entry(vcpu, (u64)gfn << PAGE_SHIFT, iterator) { |
852e3c19 | 1928 | if (iterator.level == level) { |
9f652d21 AK |
1929 | mmu_set_spte(vcpu, iterator.sptep, ACC_ALL, ACC_ALL, |
1930 | 0, write, 1, &pt_write, | |
1403283a | 1931 | level, gfn, pfn, false, true); |
9f652d21 AK |
1932 | ++vcpu->stat.pf_fixed; |
1933 | break; | |
6aa8b732 AK |
1934 | } |
1935 | ||
9f652d21 AK |
1936 | if (*iterator.sptep == shadow_trap_nonpresent_pte) { |
1937 | pseudo_gfn = (iterator.addr & PT64_DIR_BASE_ADDR_MASK) >> PAGE_SHIFT; | |
1938 | sp = kvm_mmu_get_page(vcpu, pseudo_gfn, iterator.addr, | |
1939 | iterator.level - 1, | |
1940 | 1, ACC_ALL, iterator.sptep); | |
1941 | if (!sp) { | |
1942 | pgprintk("nonpaging_map: ENOMEM\n"); | |
1943 | kvm_release_pfn_clean(pfn); | |
1944 | return -ENOMEM; | |
1945 | } | |
140754bc | 1946 | |
d555c333 AK |
1947 | __set_spte(iterator.sptep, |
1948 | __pa(sp->spt) | |
1949 | | PT_PRESENT_MASK | PT_WRITABLE_MASK | |
1950 | | shadow_user_mask | shadow_x_mask); | |
9f652d21 AK |
1951 | } |
1952 | } | |
1953 | return pt_write; | |
6aa8b732 AK |
1954 | } |
1955 | ||
10589a46 MT |
1956 | static int nonpaging_map(struct kvm_vcpu *vcpu, gva_t v, int write, gfn_t gfn) |
1957 | { | |
1958 | int r; | |
852e3c19 | 1959 | int level; |
35149e21 | 1960 | pfn_t pfn; |
e930bffe | 1961 | unsigned long mmu_seq; |
aaee2c94 | 1962 | |
852e3c19 JR |
1963 | level = mapping_level(vcpu, gfn); |
1964 | ||
1965 | /* | |
1966 | * This path builds a PAE pagetable - so we can map 2mb pages at | |
1967 | * maximum. Therefore check if the level is larger than that. | |
1968 | */ | |
1969 | if (level > PT_DIRECTORY_LEVEL) | |
1970 | level = PT_DIRECTORY_LEVEL; | |
1971 | ||
1972 | gfn &= ~(KVM_PAGES_PER_HPAGE(level) - 1); | |
05da4558 | 1973 | |
e930bffe | 1974 | mmu_seq = vcpu->kvm->mmu_notifier_seq; |
4c2155ce | 1975 | smp_rmb(); |
35149e21 | 1976 | pfn = gfn_to_pfn(vcpu->kvm, gfn); |
aaee2c94 | 1977 | |
d196e343 | 1978 | /* mmio */ |
35149e21 AL |
1979 | if (is_error_pfn(pfn)) { |
1980 | kvm_release_pfn_clean(pfn); | |
d196e343 AK |
1981 | return 1; |
1982 | } | |
1983 | ||
aaee2c94 | 1984 | spin_lock(&vcpu->kvm->mmu_lock); |
e930bffe AA |
1985 | if (mmu_notifier_retry(vcpu, mmu_seq)) |
1986 | goto out_unlock; | |
eb787d10 | 1987 | kvm_mmu_free_some_pages(vcpu); |
852e3c19 | 1988 | r = __direct_map(vcpu, v, write, level, gfn, pfn); |
aaee2c94 MT |
1989 | spin_unlock(&vcpu->kvm->mmu_lock); |
1990 | ||
aaee2c94 | 1991 | |
10589a46 | 1992 | return r; |
e930bffe AA |
1993 | |
1994 | out_unlock: | |
1995 | spin_unlock(&vcpu->kvm->mmu_lock); | |
1996 | kvm_release_pfn_clean(pfn); | |
1997 | return 0; | |
10589a46 MT |
1998 | } |
1999 | ||
2000 | ||
17ac10ad AK |
2001 | static void mmu_free_roots(struct kvm_vcpu *vcpu) |
2002 | { | |
2003 | int i; | |
4db35314 | 2004 | struct kvm_mmu_page *sp; |
17ac10ad | 2005 | |
ad312c7c | 2006 | if (!VALID_PAGE(vcpu->arch.mmu.root_hpa)) |
7b53aa56 | 2007 | return; |
aaee2c94 | 2008 | spin_lock(&vcpu->kvm->mmu_lock); |
ad312c7c ZX |
2009 | if (vcpu->arch.mmu.shadow_root_level == PT64_ROOT_LEVEL) { |
2010 | hpa_t root = vcpu->arch.mmu.root_hpa; | |
17ac10ad | 2011 | |
4db35314 AK |
2012 | sp = page_header(root); |
2013 | --sp->root_count; | |
2e53d63a MT |
2014 | if (!sp->root_count && sp->role.invalid) |
2015 | kvm_mmu_zap_page(vcpu->kvm, sp); | |
ad312c7c | 2016 | vcpu->arch.mmu.root_hpa = INVALID_PAGE; |
aaee2c94 | 2017 | spin_unlock(&vcpu->kvm->mmu_lock); |
17ac10ad AK |
2018 | return; |
2019 | } | |
17ac10ad | 2020 | for (i = 0; i < 4; ++i) { |
ad312c7c | 2021 | hpa_t root = vcpu->arch.mmu.pae_root[i]; |
17ac10ad | 2022 | |
417726a3 | 2023 | if (root) { |
417726a3 | 2024 | root &= PT64_BASE_ADDR_MASK; |
4db35314 AK |
2025 | sp = page_header(root); |
2026 | --sp->root_count; | |
2e53d63a MT |
2027 | if (!sp->root_count && sp->role.invalid) |
2028 | kvm_mmu_zap_page(vcpu->kvm, sp); | |
417726a3 | 2029 | } |
ad312c7c | 2030 | vcpu->arch.mmu.pae_root[i] = INVALID_PAGE; |
17ac10ad | 2031 | } |
aaee2c94 | 2032 | spin_unlock(&vcpu->kvm->mmu_lock); |
ad312c7c | 2033 | vcpu->arch.mmu.root_hpa = INVALID_PAGE; |
17ac10ad AK |
2034 | } |
2035 | ||
8986ecc0 MT |
2036 | static int mmu_check_root(struct kvm_vcpu *vcpu, gfn_t root_gfn) |
2037 | { | |
2038 | int ret = 0; | |
2039 | ||
2040 | if (!kvm_is_visible_gfn(vcpu->kvm, root_gfn)) { | |
2041 | set_bit(KVM_REQ_TRIPLE_FAULT, &vcpu->requests); | |
2042 | ret = 1; | |
2043 | } | |
2044 | ||
2045 | return ret; | |
2046 | } | |
2047 | ||
2048 | static int mmu_alloc_roots(struct kvm_vcpu *vcpu) | |
17ac10ad AK |
2049 | { |
2050 | int i; | |
cea0f0e7 | 2051 | gfn_t root_gfn; |
4db35314 | 2052 | struct kvm_mmu_page *sp; |
f6e2c02b | 2053 | int direct = 0; |
6de4f3ad | 2054 | u64 pdptr; |
3bb65a22 | 2055 | |
ad312c7c | 2056 | root_gfn = vcpu->arch.cr3 >> PAGE_SHIFT; |
17ac10ad | 2057 | |
ad312c7c ZX |
2058 | if (vcpu->arch.mmu.shadow_root_level == PT64_ROOT_LEVEL) { |
2059 | hpa_t root = vcpu->arch.mmu.root_hpa; | |
17ac10ad AK |
2060 | |
2061 | ASSERT(!VALID_PAGE(root)); | |
fb72d167 | 2062 | if (tdp_enabled) |
f6e2c02b | 2063 | direct = 1; |
8986ecc0 MT |
2064 | if (mmu_check_root(vcpu, root_gfn)) |
2065 | return 1; | |
4db35314 | 2066 | sp = kvm_mmu_get_page(vcpu, root_gfn, 0, |
f6e2c02b | 2067 | PT64_ROOT_LEVEL, direct, |
fb72d167 | 2068 | ACC_ALL, NULL); |
4db35314 AK |
2069 | root = __pa(sp->spt); |
2070 | ++sp->root_count; | |
ad312c7c | 2071 | vcpu->arch.mmu.root_hpa = root; |
8986ecc0 | 2072 | return 0; |
17ac10ad | 2073 | } |
f6e2c02b | 2074 | direct = !is_paging(vcpu); |
fb72d167 | 2075 | if (tdp_enabled) |
f6e2c02b | 2076 | direct = 1; |
17ac10ad | 2077 | for (i = 0; i < 4; ++i) { |
ad312c7c | 2078 | hpa_t root = vcpu->arch.mmu.pae_root[i]; |
17ac10ad AK |
2079 | |
2080 | ASSERT(!VALID_PAGE(root)); | |
ad312c7c | 2081 | if (vcpu->arch.mmu.root_level == PT32E_ROOT_LEVEL) { |
6de4f3ad | 2082 | pdptr = kvm_pdptr_read(vcpu, i); |
43a3795a | 2083 | if (!is_present_gpte(pdptr)) { |
ad312c7c | 2084 | vcpu->arch.mmu.pae_root[i] = 0; |
417726a3 AK |
2085 | continue; |
2086 | } | |
6de4f3ad | 2087 | root_gfn = pdptr >> PAGE_SHIFT; |
ad312c7c | 2088 | } else if (vcpu->arch.mmu.root_level == 0) |
cea0f0e7 | 2089 | root_gfn = 0; |
8986ecc0 MT |
2090 | if (mmu_check_root(vcpu, root_gfn)) |
2091 | return 1; | |
4db35314 | 2092 | sp = kvm_mmu_get_page(vcpu, root_gfn, i << 30, |
f6e2c02b | 2093 | PT32_ROOT_LEVEL, direct, |
f7d9c7b7 | 2094 | ACC_ALL, NULL); |
4db35314 AK |
2095 | root = __pa(sp->spt); |
2096 | ++sp->root_count; | |
ad312c7c | 2097 | vcpu->arch.mmu.pae_root[i] = root | PT_PRESENT_MASK; |
17ac10ad | 2098 | } |
ad312c7c | 2099 | vcpu->arch.mmu.root_hpa = __pa(vcpu->arch.mmu.pae_root); |
8986ecc0 | 2100 | return 0; |
17ac10ad AK |
2101 | } |
2102 | ||
0ba73cda MT |
2103 | static void mmu_sync_roots(struct kvm_vcpu *vcpu) |
2104 | { | |
2105 | int i; | |
2106 | struct kvm_mmu_page *sp; | |
2107 | ||
2108 | if (!VALID_PAGE(vcpu->arch.mmu.root_hpa)) | |
2109 | return; | |
2110 | if (vcpu->arch.mmu.shadow_root_level == PT64_ROOT_LEVEL) { | |
2111 | hpa_t root = vcpu->arch.mmu.root_hpa; | |
2112 | sp = page_header(root); | |
2113 | mmu_sync_children(vcpu, sp); | |
2114 | return; | |
2115 | } | |
2116 | for (i = 0; i < 4; ++i) { | |
2117 | hpa_t root = vcpu->arch.mmu.pae_root[i]; | |
2118 | ||
8986ecc0 | 2119 | if (root && VALID_PAGE(root)) { |
0ba73cda MT |
2120 | root &= PT64_BASE_ADDR_MASK; |
2121 | sp = page_header(root); | |
2122 | mmu_sync_children(vcpu, sp); | |
2123 | } | |
2124 | } | |
2125 | } | |
2126 | ||
2127 | void kvm_mmu_sync_roots(struct kvm_vcpu *vcpu) | |
2128 | { | |
2129 | spin_lock(&vcpu->kvm->mmu_lock); | |
2130 | mmu_sync_roots(vcpu); | |
6cffe8ca | 2131 | spin_unlock(&vcpu->kvm->mmu_lock); |
0ba73cda MT |
2132 | } |
2133 | ||
1871c602 GN |
2134 | static gpa_t nonpaging_gva_to_gpa(struct kvm_vcpu *vcpu, gva_t vaddr, |
2135 | u32 access, u32 *error) | |
6aa8b732 | 2136 | { |
1871c602 GN |
2137 | if (error) |
2138 | *error = 0; | |
6aa8b732 AK |
2139 | return vaddr; |
2140 | } | |
2141 | ||
2142 | static int nonpaging_page_fault(struct kvm_vcpu *vcpu, gva_t gva, | |
3f3e7124 | 2143 | u32 error_code) |
6aa8b732 | 2144 | { |
e833240f | 2145 | gfn_t gfn; |
e2dec939 | 2146 | int r; |
6aa8b732 | 2147 | |
b8688d51 | 2148 | pgprintk("%s: gva %lx error %x\n", __func__, gva, error_code); |
e2dec939 AK |
2149 | r = mmu_topup_memory_caches(vcpu); |
2150 | if (r) | |
2151 | return r; | |
714b93da | 2152 | |
6aa8b732 | 2153 | ASSERT(vcpu); |
ad312c7c | 2154 | ASSERT(VALID_PAGE(vcpu->arch.mmu.root_hpa)); |
6aa8b732 | 2155 | |
e833240f | 2156 | gfn = gva >> PAGE_SHIFT; |
6aa8b732 | 2157 | |
e833240f AK |
2158 | return nonpaging_map(vcpu, gva & PAGE_MASK, |
2159 | error_code & PFERR_WRITE_MASK, gfn); | |
6aa8b732 AK |
2160 | } |
2161 | ||
fb72d167 JR |
2162 | static int tdp_page_fault(struct kvm_vcpu *vcpu, gva_t gpa, |
2163 | u32 error_code) | |
2164 | { | |
35149e21 | 2165 | pfn_t pfn; |
fb72d167 | 2166 | int r; |
852e3c19 | 2167 | int level; |
05da4558 | 2168 | gfn_t gfn = gpa >> PAGE_SHIFT; |
e930bffe | 2169 | unsigned long mmu_seq; |
fb72d167 JR |
2170 | |
2171 | ASSERT(vcpu); | |
2172 | ASSERT(VALID_PAGE(vcpu->arch.mmu.root_hpa)); | |
2173 | ||
2174 | r = mmu_topup_memory_caches(vcpu); | |
2175 | if (r) | |
2176 | return r; | |
2177 | ||
852e3c19 JR |
2178 | level = mapping_level(vcpu, gfn); |
2179 | ||
2180 | gfn &= ~(KVM_PAGES_PER_HPAGE(level) - 1); | |
2181 | ||
e930bffe | 2182 | mmu_seq = vcpu->kvm->mmu_notifier_seq; |
4c2155ce | 2183 | smp_rmb(); |
35149e21 | 2184 | pfn = gfn_to_pfn(vcpu->kvm, gfn); |
35149e21 AL |
2185 | if (is_error_pfn(pfn)) { |
2186 | kvm_release_pfn_clean(pfn); | |
fb72d167 JR |
2187 | return 1; |
2188 | } | |
2189 | spin_lock(&vcpu->kvm->mmu_lock); | |
e930bffe AA |
2190 | if (mmu_notifier_retry(vcpu, mmu_seq)) |
2191 | goto out_unlock; | |
fb72d167 JR |
2192 | kvm_mmu_free_some_pages(vcpu); |
2193 | r = __direct_map(vcpu, gpa, error_code & PFERR_WRITE_MASK, | |
852e3c19 | 2194 | level, gfn, pfn); |
fb72d167 | 2195 | spin_unlock(&vcpu->kvm->mmu_lock); |
fb72d167 JR |
2196 | |
2197 | return r; | |
e930bffe AA |
2198 | |
2199 | out_unlock: | |
2200 | spin_unlock(&vcpu->kvm->mmu_lock); | |
2201 | kvm_release_pfn_clean(pfn); | |
2202 | return 0; | |
fb72d167 JR |
2203 | } |
2204 | ||
6aa8b732 AK |
2205 | static void nonpaging_free(struct kvm_vcpu *vcpu) |
2206 | { | |
17ac10ad | 2207 | mmu_free_roots(vcpu); |
6aa8b732 AK |
2208 | } |
2209 | ||
2210 | static int nonpaging_init_context(struct kvm_vcpu *vcpu) | |
2211 | { | |
ad312c7c | 2212 | struct kvm_mmu *context = &vcpu->arch.mmu; |
6aa8b732 AK |
2213 | |
2214 | context->new_cr3 = nonpaging_new_cr3; | |
2215 | context->page_fault = nonpaging_page_fault; | |
6aa8b732 AK |
2216 | context->gva_to_gpa = nonpaging_gva_to_gpa; |
2217 | context->free = nonpaging_free; | |
c7addb90 | 2218 | context->prefetch_page = nonpaging_prefetch_page; |
e8bc217a | 2219 | context->sync_page = nonpaging_sync_page; |
a7052897 | 2220 | context->invlpg = nonpaging_invlpg; |
cea0f0e7 | 2221 | context->root_level = 0; |
6aa8b732 | 2222 | context->shadow_root_level = PT32E_ROOT_LEVEL; |
17c3ba9d | 2223 | context->root_hpa = INVALID_PAGE; |
6aa8b732 AK |
2224 | return 0; |
2225 | } | |
2226 | ||
d835dfec | 2227 | void kvm_mmu_flush_tlb(struct kvm_vcpu *vcpu) |
6aa8b732 | 2228 | { |
1165f5fe | 2229 | ++vcpu->stat.tlb_flush; |
cbdd1bea | 2230 | kvm_x86_ops->tlb_flush(vcpu); |
6aa8b732 AK |
2231 | } |
2232 | ||
2233 | static void paging_new_cr3(struct kvm_vcpu *vcpu) | |
2234 | { | |
b8688d51 | 2235 | pgprintk("%s: cr3 %lx\n", __func__, vcpu->arch.cr3); |
cea0f0e7 | 2236 | mmu_free_roots(vcpu); |
6aa8b732 AK |
2237 | } |
2238 | ||
6aa8b732 AK |
2239 | static void inject_page_fault(struct kvm_vcpu *vcpu, |
2240 | u64 addr, | |
2241 | u32 err_code) | |
2242 | { | |
c3c91fee | 2243 | kvm_inject_page_fault(vcpu, addr, err_code); |
6aa8b732 AK |
2244 | } |
2245 | ||
6aa8b732 AK |
2246 | static void paging_free(struct kvm_vcpu *vcpu) |
2247 | { | |
2248 | nonpaging_free(vcpu); | |
2249 | } | |
2250 | ||
82725b20 DE |
2251 | static bool is_rsvd_bits_set(struct kvm_vcpu *vcpu, u64 gpte, int level) |
2252 | { | |
2253 | int bit7; | |
2254 | ||
2255 | bit7 = (gpte >> 7) & 1; | |
2256 | return (gpte & vcpu->arch.mmu.rsvd_bits_mask[bit7][level-1]) != 0; | |
2257 | } | |
2258 | ||
6aa8b732 AK |
2259 | #define PTTYPE 64 |
2260 | #include "paging_tmpl.h" | |
2261 | #undef PTTYPE | |
2262 | ||
2263 | #define PTTYPE 32 | |
2264 | #include "paging_tmpl.h" | |
2265 | #undef PTTYPE | |
2266 | ||
82725b20 DE |
2267 | static void reset_rsvds_bits_mask(struct kvm_vcpu *vcpu, int level) |
2268 | { | |
2269 | struct kvm_mmu *context = &vcpu->arch.mmu; | |
2270 | int maxphyaddr = cpuid_maxphyaddr(vcpu); | |
2271 | u64 exb_bit_rsvd = 0; | |
2272 | ||
2273 | if (!is_nx(vcpu)) | |
2274 | exb_bit_rsvd = rsvd_bits(63, 63); | |
2275 | switch (level) { | |
2276 | case PT32_ROOT_LEVEL: | |
2277 | /* no rsvd bits for 2 level 4K page table entries */ | |
2278 | context->rsvd_bits_mask[0][1] = 0; | |
2279 | context->rsvd_bits_mask[0][0] = 0; | |
f815bce8 XG |
2280 | context->rsvd_bits_mask[1][0] = context->rsvd_bits_mask[0][0]; |
2281 | ||
2282 | if (!is_pse(vcpu)) { | |
2283 | context->rsvd_bits_mask[1][1] = 0; | |
2284 | break; | |
2285 | } | |
2286 | ||
82725b20 DE |
2287 | if (is_cpuid_PSE36()) |
2288 | /* 36bits PSE 4MB page */ | |
2289 | context->rsvd_bits_mask[1][1] = rsvd_bits(17, 21); | |
2290 | else | |
2291 | /* 32 bits PSE 4MB page */ | |
2292 | context->rsvd_bits_mask[1][1] = rsvd_bits(13, 21); | |
82725b20 DE |
2293 | break; |
2294 | case PT32E_ROOT_LEVEL: | |
20c466b5 DE |
2295 | context->rsvd_bits_mask[0][2] = |
2296 | rsvd_bits(maxphyaddr, 63) | | |
2297 | rsvd_bits(7, 8) | rsvd_bits(1, 2); /* PDPTE */ | |
82725b20 | 2298 | context->rsvd_bits_mask[0][1] = exb_bit_rsvd | |
4c26b4cd | 2299 | rsvd_bits(maxphyaddr, 62); /* PDE */ |
82725b20 DE |
2300 | context->rsvd_bits_mask[0][0] = exb_bit_rsvd | |
2301 | rsvd_bits(maxphyaddr, 62); /* PTE */ | |
2302 | context->rsvd_bits_mask[1][1] = exb_bit_rsvd | | |
2303 | rsvd_bits(maxphyaddr, 62) | | |
2304 | rsvd_bits(13, 20); /* large page */ | |
f815bce8 | 2305 | context->rsvd_bits_mask[1][0] = context->rsvd_bits_mask[0][0]; |
82725b20 DE |
2306 | break; |
2307 | case PT64_ROOT_LEVEL: | |
2308 | context->rsvd_bits_mask[0][3] = exb_bit_rsvd | | |
2309 | rsvd_bits(maxphyaddr, 51) | rsvd_bits(7, 8); | |
2310 | context->rsvd_bits_mask[0][2] = exb_bit_rsvd | | |
2311 | rsvd_bits(maxphyaddr, 51) | rsvd_bits(7, 8); | |
2312 | context->rsvd_bits_mask[0][1] = exb_bit_rsvd | | |
4c26b4cd | 2313 | rsvd_bits(maxphyaddr, 51); |
82725b20 DE |
2314 | context->rsvd_bits_mask[0][0] = exb_bit_rsvd | |
2315 | rsvd_bits(maxphyaddr, 51); | |
2316 | context->rsvd_bits_mask[1][3] = context->rsvd_bits_mask[0][3]; | |
e04da980 JR |
2317 | context->rsvd_bits_mask[1][2] = exb_bit_rsvd | |
2318 | rsvd_bits(maxphyaddr, 51) | | |
2319 | rsvd_bits(13, 29); | |
82725b20 | 2320 | context->rsvd_bits_mask[1][1] = exb_bit_rsvd | |
4c26b4cd SY |
2321 | rsvd_bits(maxphyaddr, 51) | |
2322 | rsvd_bits(13, 20); /* large page */ | |
f815bce8 | 2323 | context->rsvd_bits_mask[1][0] = context->rsvd_bits_mask[0][0]; |
82725b20 DE |
2324 | break; |
2325 | } | |
2326 | } | |
2327 | ||
17ac10ad | 2328 | static int paging64_init_context_common(struct kvm_vcpu *vcpu, int level) |
6aa8b732 | 2329 | { |
ad312c7c | 2330 | struct kvm_mmu *context = &vcpu->arch.mmu; |
6aa8b732 AK |
2331 | |
2332 | ASSERT(is_pae(vcpu)); | |
2333 | context->new_cr3 = paging_new_cr3; | |
2334 | context->page_fault = paging64_page_fault; | |
6aa8b732 | 2335 | context->gva_to_gpa = paging64_gva_to_gpa; |
c7addb90 | 2336 | context->prefetch_page = paging64_prefetch_page; |
e8bc217a | 2337 | context->sync_page = paging64_sync_page; |
a7052897 | 2338 | context->invlpg = paging64_invlpg; |
6aa8b732 | 2339 | context->free = paging_free; |
17ac10ad AK |
2340 | context->root_level = level; |
2341 | context->shadow_root_level = level; | |
17c3ba9d | 2342 | context->root_hpa = INVALID_PAGE; |
6aa8b732 AK |
2343 | return 0; |
2344 | } | |
2345 | ||
17ac10ad AK |
2346 | static int paging64_init_context(struct kvm_vcpu *vcpu) |
2347 | { | |
82725b20 | 2348 | reset_rsvds_bits_mask(vcpu, PT64_ROOT_LEVEL); |
17ac10ad AK |
2349 | return paging64_init_context_common(vcpu, PT64_ROOT_LEVEL); |
2350 | } | |
2351 | ||
6aa8b732 AK |
2352 | static int paging32_init_context(struct kvm_vcpu *vcpu) |
2353 | { | |
ad312c7c | 2354 | struct kvm_mmu *context = &vcpu->arch.mmu; |
6aa8b732 | 2355 | |
82725b20 | 2356 | reset_rsvds_bits_mask(vcpu, PT32_ROOT_LEVEL); |
6aa8b732 AK |
2357 | context->new_cr3 = paging_new_cr3; |
2358 | context->page_fault = paging32_page_fault; | |
6aa8b732 AK |
2359 | context->gva_to_gpa = paging32_gva_to_gpa; |
2360 | context->free = paging_free; | |
c7addb90 | 2361 | context->prefetch_page = paging32_prefetch_page; |
e8bc217a | 2362 | context->sync_page = paging32_sync_page; |
a7052897 | 2363 | context->invlpg = paging32_invlpg; |
6aa8b732 AK |
2364 | context->root_level = PT32_ROOT_LEVEL; |
2365 | context->shadow_root_level = PT32E_ROOT_LEVEL; | |
17c3ba9d | 2366 | context->root_hpa = INVALID_PAGE; |
6aa8b732 AK |
2367 | return 0; |
2368 | } | |
2369 | ||
2370 | static int paging32E_init_context(struct kvm_vcpu *vcpu) | |
2371 | { | |
82725b20 | 2372 | reset_rsvds_bits_mask(vcpu, PT32E_ROOT_LEVEL); |
17ac10ad | 2373 | return paging64_init_context_common(vcpu, PT32E_ROOT_LEVEL); |
6aa8b732 AK |
2374 | } |
2375 | ||
fb72d167 JR |
2376 | static int init_kvm_tdp_mmu(struct kvm_vcpu *vcpu) |
2377 | { | |
2378 | struct kvm_mmu *context = &vcpu->arch.mmu; | |
2379 | ||
2380 | context->new_cr3 = nonpaging_new_cr3; | |
2381 | context->page_fault = tdp_page_fault; | |
2382 | context->free = nonpaging_free; | |
2383 | context->prefetch_page = nonpaging_prefetch_page; | |
e8bc217a | 2384 | context->sync_page = nonpaging_sync_page; |
a7052897 | 2385 | context->invlpg = nonpaging_invlpg; |
67253af5 | 2386 | context->shadow_root_level = kvm_x86_ops->get_tdp_level(); |
fb72d167 JR |
2387 | context->root_hpa = INVALID_PAGE; |
2388 | ||
2389 | if (!is_paging(vcpu)) { | |
2390 | context->gva_to_gpa = nonpaging_gva_to_gpa; | |
2391 | context->root_level = 0; | |
2392 | } else if (is_long_mode(vcpu)) { | |
82725b20 | 2393 | reset_rsvds_bits_mask(vcpu, PT64_ROOT_LEVEL); |
fb72d167 JR |
2394 | context->gva_to_gpa = paging64_gva_to_gpa; |
2395 | context->root_level = PT64_ROOT_LEVEL; | |
2396 | } else if (is_pae(vcpu)) { | |
82725b20 | 2397 | reset_rsvds_bits_mask(vcpu, PT32E_ROOT_LEVEL); |
fb72d167 JR |
2398 | context->gva_to_gpa = paging64_gva_to_gpa; |
2399 | context->root_level = PT32E_ROOT_LEVEL; | |
2400 | } else { | |
82725b20 | 2401 | reset_rsvds_bits_mask(vcpu, PT32_ROOT_LEVEL); |
fb72d167 JR |
2402 | context->gva_to_gpa = paging32_gva_to_gpa; |
2403 | context->root_level = PT32_ROOT_LEVEL; | |
2404 | } | |
2405 | ||
2406 | return 0; | |
2407 | } | |
2408 | ||
2409 | static int init_kvm_softmmu(struct kvm_vcpu *vcpu) | |
6aa8b732 | 2410 | { |
a770f6f2 AK |
2411 | int r; |
2412 | ||
6aa8b732 | 2413 | ASSERT(vcpu); |
ad312c7c | 2414 | ASSERT(!VALID_PAGE(vcpu->arch.mmu.root_hpa)); |
6aa8b732 AK |
2415 | |
2416 | if (!is_paging(vcpu)) | |
a770f6f2 | 2417 | r = nonpaging_init_context(vcpu); |
a9058ecd | 2418 | else if (is_long_mode(vcpu)) |
a770f6f2 | 2419 | r = paging64_init_context(vcpu); |
6aa8b732 | 2420 | else if (is_pae(vcpu)) |
a770f6f2 | 2421 | r = paging32E_init_context(vcpu); |
6aa8b732 | 2422 | else |
a770f6f2 AK |
2423 | r = paging32_init_context(vcpu); |
2424 | ||
5b7e0102 | 2425 | vcpu->arch.mmu.base_role.cr4_pae = !!is_pae(vcpu); |
a770f6f2 AK |
2426 | |
2427 | return r; | |
6aa8b732 AK |
2428 | } |
2429 | ||
fb72d167 JR |
2430 | static int init_kvm_mmu(struct kvm_vcpu *vcpu) |
2431 | { | |
35149e21 AL |
2432 | vcpu->arch.update_pte.pfn = bad_pfn; |
2433 | ||
fb72d167 JR |
2434 | if (tdp_enabled) |
2435 | return init_kvm_tdp_mmu(vcpu); | |
2436 | else | |
2437 | return init_kvm_softmmu(vcpu); | |
2438 | } | |
2439 | ||
6aa8b732 AK |
2440 | static void destroy_kvm_mmu(struct kvm_vcpu *vcpu) |
2441 | { | |
2442 | ASSERT(vcpu); | |
ad312c7c ZX |
2443 | if (VALID_PAGE(vcpu->arch.mmu.root_hpa)) { |
2444 | vcpu->arch.mmu.free(vcpu); | |
2445 | vcpu->arch.mmu.root_hpa = INVALID_PAGE; | |
6aa8b732 AK |
2446 | } |
2447 | } | |
2448 | ||
2449 | int kvm_mmu_reset_context(struct kvm_vcpu *vcpu) | |
17c3ba9d AK |
2450 | { |
2451 | destroy_kvm_mmu(vcpu); | |
2452 | return init_kvm_mmu(vcpu); | |
2453 | } | |
8668a3c4 | 2454 | EXPORT_SYMBOL_GPL(kvm_mmu_reset_context); |
17c3ba9d AK |
2455 | |
2456 | int kvm_mmu_load(struct kvm_vcpu *vcpu) | |
6aa8b732 | 2457 | { |
714b93da AK |
2458 | int r; |
2459 | ||
e2dec939 | 2460 | r = mmu_topup_memory_caches(vcpu); |
17c3ba9d AK |
2461 | if (r) |
2462 | goto out; | |
aaee2c94 | 2463 | spin_lock(&vcpu->kvm->mmu_lock); |
eb787d10 | 2464 | kvm_mmu_free_some_pages(vcpu); |
8986ecc0 | 2465 | r = mmu_alloc_roots(vcpu); |
0ba73cda | 2466 | mmu_sync_roots(vcpu); |
aaee2c94 | 2467 | spin_unlock(&vcpu->kvm->mmu_lock); |
8986ecc0 MT |
2468 | if (r) |
2469 | goto out; | |
3662cb1c | 2470 | /* set_cr3() should ensure TLB has been flushed */ |
ad312c7c | 2471 | kvm_x86_ops->set_cr3(vcpu, vcpu->arch.mmu.root_hpa); |
714b93da AK |
2472 | out: |
2473 | return r; | |
6aa8b732 | 2474 | } |
17c3ba9d AK |
2475 | EXPORT_SYMBOL_GPL(kvm_mmu_load); |
2476 | ||
2477 | void kvm_mmu_unload(struct kvm_vcpu *vcpu) | |
2478 | { | |
2479 | mmu_free_roots(vcpu); | |
2480 | } | |
6aa8b732 | 2481 | |
09072daf | 2482 | static void mmu_pte_write_zap_pte(struct kvm_vcpu *vcpu, |
4db35314 | 2483 | struct kvm_mmu_page *sp, |
ac1b714e AK |
2484 | u64 *spte) |
2485 | { | |
2486 | u64 pte; | |
2487 | struct kvm_mmu_page *child; | |
2488 | ||
2489 | pte = *spte; | |
c7addb90 | 2490 | if (is_shadow_present_pte(pte)) { |
776e6633 | 2491 | if (is_last_spte(pte, sp->role.level)) |
290fc38d | 2492 | rmap_remove(vcpu->kvm, spte); |
ac1b714e AK |
2493 | else { |
2494 | child = page_header(pte & PT64_BASE_ADDR_MASK); | |
90cb0529 | 2495 | mmu_page_remove_parent_pte(child, spte); |
ac1b714e AK |
2496 | } |
2497 | } | |
d555c333 | 2498 | __set_spte(spte, shadow_trap_nonpresent_pte); |
05da4558 MT |
2499 | if (is_large_pte(pte)) |
2500 | --vcpu->kvm->stat.lpages; | |
ac1b714e AK |
2501 | } |
2502 | ||
0028425f | 2503 | static void mmu_pte_write_new_pte(struct kvm_vcpu *vcpu, |
4db35314 | 2504 | struct kvm_mmu_page *sp, |
0028425f | 2505 | u64 *spte, |
489f1d65 | 2506 | const void *new) |
0028425f | 2507 | { |
30945387 | 2508 | if (sp->role.level != PT_PAGE_TABLE_LEVEL) { |
7e4e4056 JR |
2509 | ++vcpu->kvm->stat.mmu_pde_zapped; |
2510 | return; | |
30945387 | 2511 | } |
0028425f | 2512 | |
4cee5764 | 2513 | ++vcpu->kvm->stat.mmu_pte_updated; |
5b7e0102 | 2514 | if (!sp->role.cr4_pae) |
489f1d65 | 2515 | paging32_update_pte(vcpu, sp, spte, new); |
0028425f | 2516 | else |
489f1d65 | 2517 | paging64_update_pte(vcpu, sp, spte, new); |
0028425f AK |
2518 | } |
2519 | ||
79539cec AK |
2520 | static bool need_remote_flush(u64 old, u64 new) |
2521 | { | |
2522 | if (!is_shadow_present_pte(old)) | |
2523 | return false; | |
2524 | if (!is_shadow_present_pte(new)) | |
2525 | return true; | |
2526 | if ((old ^ new) & PT64_BASE_ADDR_MASK) | |
2527 | return true; | |
2528 | old ^= PT64_NX_MASK; | |
2529 | new ^= PT64_NX_MASK; | |
2530 | return (old & ~new & PT64_PERM_MASK) != 0; | |
2531 | } | |
2532 | ||
2533 | static void mmu_pte_write_flush_tlb(struct kvm_vcpu *vcpu, u64 old, u64 new) | |
2534 | { | |
2535 | if (need_remote_flush(old, new)) | |
2536 | kvm_flush_remote_tlbs(vcpu->kvm); | |
2537 | else | |
2538 | kvm_mmu_flush_tlb(vcpu); | |
2539 | } | |
2540 | ||
12b7d28f AK |
2541 | static bool last_updated_pte_accessed(struct kvm_vcpu *vcpu) |
2542 | { | |
ad312c7c | 2543 | u64 *spte = vcpu->arch.last_pte_updated; |
12b7d28f | 2544 | |
7b52345e | 2545 | return !!(spte && (*spte & shadow_accessed_mask)); |
12b7d28f AK |
2546 | } |
2547 | ||
d7824fff | 2548 | static void mmu_guess_page_from_pte_write(struct kvm_vcpu *vcpu, gpa_t gpa, |
72016f3a | 2549 | u64 gpte) |
d7824fff AK |
2550 | { |
2551 | gfn_t gfn; | |
35149e21 | 2552 | pfn_t pfn; |
d7824fff | 2553 | |
43a3795a | 2554 | if (!is_present_gpte(gpte)) |
d7824fff AK |
2555 | return; |
2556 | gfn = (gpte & PT64_BASE_ADDR_MASK) >> PAGE_SHIFT; | |
72dc67a6 | 2557 | |
e930bffe | 2558 | vcpu->arch.update_pte.mmu_seq = vcpu->kvm->mmu_notifier_seq; |
4c2155ce | 2559 | smp_rmb(); |
35149e21 | 2560 | pfn = gfn_to_pfn(vcpu->kvm, gfn); |
72dc67a6 | 2561 | |
35149e21 AL |
2562 | if (is_error_pfn(pfn)) { |
2563 | kvm_release_pfn_clean(pfn); | |
d196e343 AK |
2564 | return; |
2565 | } | |
d7824fff | 2566 | vcpu->arch.update_pte.gfn = gfn; |
35149e21 | 2567 | vcpu->arch.update_pte.pfn = pfn; |
d7824fff AK |
2568 | } |
2569 | ||
1b7fcd32 AK |
2570 | static void kvm_mmu_access_page(struct kvm_vcpu *vcpu, gfn_t gfn) |
2571 | { | |
2572 | u64 *spte = vcpu->arch.last_pte_updated; | |
2573 | ||
2574 | if (spte | |
2575 | && vcpu->arch.last_pte_gfn == gfn | |
2576 | && shadow_accessed_mask | |
2577 | && !(*spte & shadow_accessed_mask) | |
2578 | && is_shadow_present_pte(*spte)) | |
2579 | set_bit(PT_ACCESSED_SHIFT, (unsigned long *)spte); | |
2580 | } | |
2581 | ||
09072daf | 2582 | void kvm_mmu_pte_write(struct kvm_vcpu *vcpu, gpa_t gpa, |
ad218f85 MT |
2583 | const u8 *new, int bytes, |
2584 | bool guest_initiated) | |
da4a00f0 | 2585 | { |
9b7a0325 | 2586 | gfn_t gfn = gpa >> PAGE_SHIFT; |
4db35314 | 2587 | struct kvm_mmu_page *sp; |
0e7bc4b9 | 2588 | struct hlist_node *node, *n; |
9b7a0325 AK |
2589 | struct hlist_head *bucket; |
2590 | unsigned index; | |
489f1d65 | 2591 | u64 entry, gentry; |
9b7a0325 | 2592 | u64 *spte; |
9b7a0325 | 2593 | unsigned offset = offset_in_page(gpa); |
0e7bc4b9 | 2594 | unsigned pte_size; |
9b7a0325 | 2595 | unsigned page_offset; |
0e7bc4b9 | 2596 | unsigned misaligned; |
fce0657f | 2597 | unsigned quadrant; |
9b7a0325 | 2598 | int level; |
86a5ba02 | 2599 | int flooded = 0; |
ac1b714e | 2600 | int npte; |
489f1d65 | 2601 | int r; |
08e850c6 | 2602 | int invlpg_counter; |
9b7a0325 | 2603 | |
b8688d51 | 2604 | pgprintk("%s: gpa %llx bytes %d\n", __func__, gpa, bytes); |
72016f3a | 2605 | |
08e850c6 | 2606 | invlpg_counter = atomic_read(&vcpu->kvm->arch.invlpg_counter); |
72016f3a AK |
2607 | |
2608 | /* | |
2609 | * Assume that the pte write on a page table of the same type | |
2610 | * as the current vcpu paging mode. This is nearly always true | |
2611 | * (might be false while changing modes). Note it is verified later | |
2612 | * by update_pte(). | |
2613 | */ | |
08e850c6 | 2614 | if ((is_pae(vcpu) && bytes == 4) || !new) { |
72016f3a | 2615 | /* Handle a 32-bit guest writing two halves of a 64-bit gpte */ |
08e850c6 AK |
2616 | if (is_pae(vcpu)) { |
2617 | gpa &= ~(gpa_t)7; | |
2618 | bytes = 8; | |
2619 | } | |
2620 | r = kvm_read_guest(vcpu->kvm, gpa, &gentry, min(bytes, 8)); | |
72016f3a AK |
2621 | if (r) |
2622 | gentry = 0; | |
08e850c6 AK |
2623 | new = (const u8 *)&gentry; |
2624 | } | |
2625 | ||
2626 | switch (bytes) { | |
2627 | case 4: | |
2628 | gentry = *(const u32 *)new; | |
2629 | break; | |
2630 | case 8: | |
2631 | gentry = *(const u64 *)new; | |
2632 | break; | |
2633 | default: | |
2634 | gentry = 0; | |
2635 | break; | |
72016f3a AK |
2636 | } |
2637 | ||
2638 | mmu_guess_page_from_pte_write(vcpu, gpa, gentry); | |
aaee2c94 | 2639 | spin_lock(&vcpu->kvm->mmu_lock); |
08e850c6 AK |
2640 | if (atomic_read(&vcpu->kvm->arch.invlpg_counter) != invlpg_counter) |
2641 | gentry = 0; | |
1b7fcd32 | 2642 | kvm_mmu_access_page(vcpu, gfn); |
eb787d10 | 2643 | kvm_mmu_free_some_pages(vcpu); |
4cee5764 | 2644 | ++vcpu->kvm->stat.mmu_pte_write; |
c7addb90 | 2645 | kvm_mmu_audit(vcpu, "pre pte write"); |
ad218f85 MT |
2646 | if (guest_initiated) { |
2647 | if (gfn == vcpu->arch.last_pt_write_gfn | |
2648 | && !last_updated_pte_accessed(vcpu)) { | |
2649 | ++vcpu->arch.last_pt_write_count; | |
2650 | if (vcpu->arch.last_pt_write_count >= 3) | |
2651 | flooded = 1; | |
2652 | } else { | |
2653 | vcpu->arch.last_pt_write_gfn = gfn; | |
2654 | vcpu->arch.last_pt_write_count = 1; | |
2655 | vcpu->arch.last_pte_updated = NULL; | |
2656 | } | |
86a5ba02 | 2657 | } |
1ae0a13d | 2658 | index = kvm_page_table_hashfn(gfn); |
f05e70ac | 2659 | bucket = &vcpu->kvm->arch.mmu_page_hash[index]; |
3246af0e XG |
2660 | |
2661 | restart: | |
4db35314 | 2662 | hlist_for_each_entry_safe(sp, node, n, bucket, hash_link) { |
f6e2c02b | 2663 | if (sp->gfn != gfn || sp->role.direct || sp->role.invalid) |
9b7a0325 | 2664 | continue; |
5b7e0102 | 2665 | pte_size = sp->role.cr4_pae ? 8 : 4; |
0e7bc4b9 | 2666 | misaligned = (offset ^ (offset + bytes - 1)) & ~(pte_size - 1); |
e925c5ba | 2667 | misaligned |= bytes < 4; |
86a5ba02 | 2668 | if (misaligned || flooded) { |
0e7bc4b9 AK |
2669 | /* |
2670 | * Misaligned accesses are too much trouble to fix | |
2671 | * up; also, they usually indicate a page is not used | |
2672 | * as a page table. | |
86a5ba02 AK |
2673 | * |
2674 | * If we're seeing too many writes to a page, | |
2675 | * it may no longer be a page table, or we may be | |
2676 | * forking, in which case it is better to unmap the | |
2677 | * page. | |
0e7bc4b9 AK |
2678 | */ |
2679 | pgprintk("misaligned: gpa %llx bytes %d role %x\n", | |
4db35314 | 2680 | gpa, bytes, sp->role.word); |
07385413 | 2681 | if (kvm_mmu_zap_page(vcpu->kvm, sp)) |
3246af0e | 2682 | goto restart; |
4cee5764 | 2683 | ++vcpu->kvm->stat.mmu_flooded; |
0e7bc4b9 AK |
2684 | continue; |
2685 | } | |
9b7a0325 | 2686 | page_offset = offset; |
4db35314 | 2687 | level = sp->role.level; |
ac1b714e | 2688 | npte = 1; |
5b7e0102 | 2689 | if (!sp->role.cr4_pae) { |
ac1b714e AK |
2690 | page_offset <<= 1; /* 32->64 */ |
2691 | /* | |
2692 | * A 32-bit pde maps 4MB while the shadow pdes map | |
2693 | * only 2MB. So we need to double the offset again | |
2694 | * and zap two pdes instead of one. | |
2695 | */ | |
2696 | if (level == PT32_ROOT_LEVEL) { | |
6b8d0f9b | 2697 | page_offset &= ~7; /* kill rounding error */ |
ac1b714e AK |
2698 | page_offset <<= 1; |
2699 | npte = 2; | |
2700 | } | |
fce0657f | 2701 | quadrant = page_offset >> PAGE_SHIFT; |
9b7a0325 | 2702 | page_offset &= ~PAGE_MASK; |
4db35314 | 2703 | if (quadrant != sp->role.quadrant) |
fce0657f | 2704 | continue; |
9b7a0325 | 2705 | } |
4db35314 | 2706 | spte = &sp->spt[page_offset / sizeof(*spte)]; |
ac1b714e | 2707 | while (npte--) { |
79539cec | 2708 | entry = *spte; |
4db35314 | 2709 | mmu_pte_write_zap_pte(vcpu, sp, spte); |
72016f3a AK |
2710 | if (gentry) |
2711 | mmu_pte_write_new_pte(vcpu, sp, spte, &gentry); | |
79539cec | 2712 | mmu_pte_write_flush_tlb(vcpu, entry, *spte); |
ac1b714e | 2713 | ++spte; |
9b7a0325 | 2714 | } |
9b7a0325 | 2715 | } |
c7addb90 | 2716 | kvm_mmu_audit(vcpu, "post pte write"); |
aaee2c94 | 2717 | spin_unlock(&vcpu->kvm->mmu_lock); |
35149e21 AL |
2718 | if (!is_error_pfn(vcpu->arch.update_pte.pfn)) { |
2719 | kvm_release_pfn_clean(vcpu->arch.update_pte.pfn); | |
2720 | vcpu->arch.update_pte.pfn = bad_pfn; | |
d7824fff | 2721 | } |
da4a00f0 AK |
2722 | } |
2723 | ||
a436036b AK |
2724 | int kvm_mmu_unprotect_page_virt(struct kvm_vcpu *vcpu, gva_t gva) |
2725 | { | |
10589a46 MT |
2726 | gpa_t gpa; |
2727 | int r; | |
a436036b | 2728 | |
60f24784 AK |
2729 | if (tdp_enabled) |
2730 | return 0; | |
2731 | ||
1871c602 | 2732 | gpa = kvm_mmu_gva_to_gpa_read(vcpu, gva, NULL); |
10589a46 | 2733 | |
aaee2c94 | 2734 | spin_lock(&vcpu->kvm->mmu_lock); |
10589a46 | 2735 | r = kvm_mmu_unprotect_page(vcpu->kvm, gpa >> PAGE_SHIFT); |
aaee2c94 | 2736 | spin_unlock(&vcpu->kvm->mmu_lock); |
10589a46 | 2737 | return r; |
a436036b | 2738 | } |
577bdc49 | 2739 | EXPORT_SYMBOL_GPL(kvm_mmu_unprotect_page_virt); |
a436036b | 2740 | |
22d95b12 | 2741 | void __kvm_mmu_free_some_pages(struct kvm_vcpu *vcpu) |
ebeace86 | 2742 | { |
3b80fffe IE |
2743 | while (vcpu->kvm->arch.n_free_mmu_pages < KVM_REFILL_PAGES && |
2744 | !list_empty(&vcpu->kvm->arch.active_mmu_pages)) { | |
4db35314 | 2745 | struct kvm_mmu_page *sp; |
ebeace86 | 2746 | |
f05e70ac | 2747 | sp = container_of(vcpu->kvm->arch.active_mmu_pages.prev, |
4db35314 AK |
2748 | struct kvm_mmu_page, link); |
2749 | kvm_mmu_zap_page(vcpu->kvm, sp); | |
4cee5764 | 2750 | ++vcpu->kvm->stat.mmu_recycled; |
ebeace86 AK |
2751 | } |
2752 | } | |
ebeace86 | 2753 | |
3067714c AK |
2754 | int kvm_mmu_page_fault(struct kvm_vcpu *vcpu, gva_t cr2, u32 error_code) |
2755 | { | |
2756 | int r; | |
2757 | enum emulation_result er; | |
2758 | ||
ad312c7c | 2759 | r = vcpu->arch.mmu.page_fault(vcpu, cr2, error_code); |
3067714c AK |
2760 | if (r < 0) |
2761 | goto out; | |
2762 | ||
2763 | if (!r) { | |
2764 | r = 1; | |
2765 | goto out; | |
2766 | } | |
2767 | ||
b733bfb5 AK |
2768 | r = mmu_topup_memory_caches(vcpu); |
2769 | if (r) | |
2770 | goto out; | |
2771 | ||
851ba692 | 2772 | er = emulate_instruction(vcpu, cr2, error_code, 0); |
3067714c AK |
2773 | |
2774 | switch (er) { | |
2775 | case EMULATE_DONE: | |
2776 | return 1; | |
2777 | case EMULATE_DO_MMIO: | |
2778 | ++vcpu->stat.mmio_exits; | |
2779 | return 0; | |
2780 | case EMULATE_FAIL: | |
3f5d18a9 AK |
2781 | vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR; |
2782 | vcpu->run->internal.suberror = KVM_INTERNAL_ERROR_EMULATION; | |
a9c7399d | 2783 | vcpu->run->internal.ndata = 0; |
3f5d18a9 | 2784 | return 0; |
3067714c AK |
2785 | default: |
2786 | BUG(); | |
2787 | } | |
2788 | out: | |
3067714c AK |
2789 | return r; |
2790 | } | |
2791 | EXPORT_SYMBOL_GPL(kvm_mmu_page_fault); | |
2792 | ||
a7052897 MT |
2793 | void kvm_mmu_invlpg(struct kvm_vcpu *vcpu, gva_t gva) |
2794 | { | |
a7052897 | 2795 | vcpu->arch.mmu.invlpg(vcpu, gva); |
a7052897 MT |
2796 | kvm_mmu_flush_tlb(vcpu); |
2797 | ++vcpu->stat.invlpg; | |
2798 | } | |
2799 | EXPORT_SYMBOL_GPL(kvm_mmu_invlpg); | |
2800 | ||
18552672 JR |
2801 | void kvm_enable_tdp(void) |
2802 | { | |
2803 | tdp_enabled = true; | |
2804 | } | |
2805 | EXPORT_SYMBOL_GPL(kvm_enable_tdp); | |
2806 | ||
5f4cb662 JR |
2807 | void kvm_disable_tdp(void) |
2808 | { | |
2809 | tdp_enabled = false; | |
2810 | } | |
2811 | EXPORT_SYMBOL_GPL(kvm_disable_tdp); | |
2812 | ||
6aa8b732 AK |
2813 | static void free_mmu_pages(struct kvm_vcpu *vcpu) |
2814 | { | |
ad312c7c | 2815 | free_page((unsigned long)vcpu->arch.mmu.pae_root); |
6aa8b732 AK |
2816 | } |
2817 | ||
2818 | static int alloc_mmu_pages(struct kvm_vcpu *vcpu) | |
2819 | { | |
17ac10ad | 2820 | struct page *page; |
6aa8b732 AK |
2821 | int i; |
2822 | ||
2823 | ASSERT(vcpu); | |
2824 | ||
17ac10ad AK |
2825 | /* |
2826 | * When emulating 32-bit mode, cr3 is only 32 bits even on x86_64. | |
2827 | * Therefore we need to allocate shadow page tables in the first | |
2828 | * 4GB of memory, which happens to fit the DMA32 zone. | |
2829 | */ | |
2830 | page = alloc_page(GFP_KERNEL | __GFP_DMA32); | |
2831 | if (!page) | |
d7fa6ab2 WY |
2832 | return -ENOMEM; |
2833 | ||
ad312c7c | 2834 | vcpu->arch.mmu.pae_root = page_address(page); |
17ac10ad | 2835 | for (i = 0; i < 4; ++i) |
ad312c7c | 2836 | vcpu->arch.mmu.pae_root[i] = INVALID_PAGE; |
17ac10ad | 2837 | |
6aa8b732 | 2838 | return 0; |
6aa8b732 AK |
2839 | } |
2840 | ||
8018c27b | 2841 | int kvm_mmu_create(struct kvm_vcpu *vcpu) |
6aa8b732 | 2842 | { |
6aa8b732 | 2843 | ASSERT(vcpu); |
ad312c7c | 2844 | ASSERT(!VALID_PAGE(vcpu->arch.mmu.root_hpa)); |
6aa8b732 | 2845 | |
8018c27b IM |
2846 | return alloc_mmu_pages(vcpu); |
2847 | } | |
6aa8b732 | 2848 | |
8018c27b IM |
2849 | int kvm_mmu_setup(struct kvm_vcpu *vcpu) |
2850 | { | |
2851 | ASSERT(vcpu); | |
ad312c7c | 2852 | ASSERT(!VALID_PAGE(vcpu->arch.mmu.root_hpa)); |
2c264957 | 2853 | |
8018c27b | 2854 | return init_kvm_mmu(vcpu); |
6aa8b732 AK |
2855 | } |
2856 | ||
2857 | void kvm_mmu_destroy(struct kvm_vcpu *vcpu) | |
2858 | { | |
2859 | ASSERT(vcpu); | |
2860 | ||
2861 | destroy_kvm_mmu(vcpu); | |
2862 | free_mmu_pages(vcpu); | |
714b93da | 2863 | mmu_free_memory_caches(vcpu); |
6aa8b732 AK |
2864 | } |
2865 | ||
90cb0529 | 2866 | void kvm_mmu_slot_remove_write_access(struct kvm *kvm, int slot) |
6aa8b732 | 2867 | { |
4db35314 | 2868 | struct kvm_mmu_page *sp; |
6aa8b732 | 2869 | |
f05e70ac | 2870 | list_for_each_entry(sp, &kvm->arch.active_mmu_pages, link) { |
6aa8b732 AK |
2871 | int i; |
2872 | u64 *pt; | |
2873 | ||
291f26bc | 2874 | if (!test_bit(slot, sp->slot_bitmap)) |
6aa8b732 AK |
2875 | continue; |
2876 | ||
4db35314 | 2877 | pt = sp->spt; |
6aa8b732 AK |
2878 | for (i = 0; i < PT64_ENT_PER_PAGE; ++i) |
2879 | /* avoid RMW */ | |
9647c14c | 2880 | if (pt[i] & PT_WRITABLE_MASK) |
6aa8b732 | 2881 | pt[i] &= ~PT_WRITABLE_MASK; |
6aa8b732 | 2882 | } |
171d595d | 2883 | kvm_flush_remote_tlbs(kvm); |
6aa8b732 | 2884 | } |
37a7d8b0 | 2885 | |
90cb0529 | 2886 | void kvm_mmu_zap_all(struct kvm *kvm) |
e0fa826f | 2887 | { |
4db35314 | 2888 | struct kvm_mmu_page *sp, *node; |
e0fa826f | 2889 | |
aaee2c94 | 2890 | spin_lock(&kvm->mmu_lock); |
3246af0e | 2891 | restart: |
f05e70ac | 2892 | list_for_each_entry_safe(sp, node, &kvm->arch.active_mmu_pages, link) |
07385413 | 2893 | if (kvm_mmu_zap_page(kvm, sp)) |
3246af0e XG |
2894 | goto restart; |
2895 | ||
aaee2c94 | 2896 | spin_unlock(&kvm->mmu_lock); |
e0fa826f | 2897 | |
90cb0529 | 2898 | kvm_flush_remote_tlbs(kvm); |
e0fa826f DL |
2899 | } |
2900 | ||
8b2cf73c | 2901 | static void kvm_mmu_remove_one_alloc_mmu_page(struct kvm *kvm) |
3ee16c81 IE |
2902 | { |
2903 | struct kvm_mmu_page *page; | |
2904 | ||
2905 | page = container_of(kvm->arch.active_mmu_pages.prev, | |
2906 | struct kvm_mmu_page, link); | |
2907 | kvm_mmu_zap_page(kvm, page); | |
2908 | } | |
2909 | ||
2910 | static int mmu_shrink(int nr_to_scan, gfp_t gfp_mask) | |
2911 | { | |
2912 | struct kvm *kvm; | |
2913 | struct kvm *kvm_freed = NULL; | |
2914 | int cache_count = 0; | |
2915 | ||
2916 | spin_lock(&kvm_lock); | |
2917 | ||
2918 | list_for_each_entry(kvm, &vm_list, vm_list) { | |
f656ce01 | 2919 | int npages, idx; |
3ee16c81 | 2920 | |
f656ce01 | 2921 | idx = srcu_read_lock(&kvm->srcu); |
3ee16c81 IE |
2922 | spin_lock(&kvm->mmu_lock); |
2923 | npages = kvm->arch.n_alloc_mmu_pages - | |
2924 | kvm->arch.n_free_mmu_pages; | |
2925 | cache_count += npages; | |
2926 | if (!kvm_freed && nr_to_scan > 0 && npages > 0) { | |
2927 | kvm_mmu_remove_one_alloc_mmu_page(kvm); | |
2928 | cache_count--; | |
2929 | kvm_freed = kvm; | |
2930 | } | |
2931 | nr_to_scan--; | |
2932 | ||
2933 | spin_unlock(&kvm->mmu_lock); | |
f656ce01 | 2934 | srcu_read_unlock(&kvm->srcu, idx); |
3ee16c81 IE |
2935 | } |
2936 | if (kvm_freed) | |
2937 | list_move_tail(&kvm_freed->vm_list, &vm_list); | |
2938 | ||
2939 | spin_unlock(&kvm_lock); | |
2940 | ||
2941 | return cache_count; | |
2942 | } | |
2943 | ||
2944 | static struct shrinker mmu_shrinker = { | |
2945 | .shrink = mmu_shrink, | |
2946 | .seeks = DEFAULT_SEEKS * 10, | |
2947 | }; | |
2948 | ||
2ddfd20e | 2949 | static void mmu_destroy_caches(void) |
b5a33a75 AK |
2950 | { |
2951 | if (pte_chain_cache) | |
2952 | kmem_cache_destroy(pte_chain_cache); | |
2953 | if (rmap_desc_cache) | |
2954 | kmem_cache_destroy(rmap_desc_cache); | |
d3d25b04 AK |
2955 | if (mmu_page_header_cache) |
2956 | kmem_cache_destroy(mmu_page_header_cache); | |
b5a33a75 AK |
2957 | } |
2958 | ||
3ee16c81 IE |
2959 | void kvm_mmu_module_exit(void) |
2960 | { | |
2961 | mmu_destroy_caches(); | |
2962 | unregister_shrinker(&mmu_shrinker); | |
2963 | } | |
2964 | ||
b5a33a75 AK |
2965 | int kvm_mmu_module_init(void) |
2966 | { | |
2967 | pte_chain_cache = kmem_cache_create("kvm_pte_chain", | |
2968 | sizeof(struct kvm_pte_chain), | |
20c2df83 | 2969 | 0, 0, NULL); |
b5a33a75 AK |
2970 | if (!pte_chain_cache) |
2971 | goto nomem; | |
2972 | rmap_desc_cache = kmem_cache_create("kvm_rmap_desc", | |
2973 | sizeof(struct kvm_rmap_desc), | |
20c2df83 | 2974 | 0, 0, NULL); |
b5a33a75 AK |
2975 | if (!rmap_desc_cache) |
2976 | goto nomem; | |
2977 | ||
d3d25b04 AK |
2978 | mmu_page_header_cache = kmem_cache_create("kvm_mmu_page_header", |
2979 | sizeof(struct kvm_mmu_page), | |
20c2df83 | 2980 | 0, 0, NULL); |
d3d25b04 AK |
2981 | if (!mmu_page_header_cache) |
2982 | goto nomem; | |
2983 | ||
3ee16c81 IE |
2984 | register_shrinker(&mmu_shrinker); |
2985 | ||
b5a33a75 AK |
2986 | return 0; |
2987 | ||
2988 | nomem: | |
3ee16c81 | 2989 | mmu_destroy_caches(); |
b5a33a75 AK |
2990 | return -ENOMEM; |
2991 | } | |
2992 | ||
3ad82a7e ZX |
2993 | /* |
2994 | * Caculate mmu pages needed for kvm. | |
2995 | */ | |
2996 | unsigned int kvm_mmu_calculate_mmu_pages(struct kvm *kvm) | |
2997 | { | |
2998 | int i; | |
2999 | unsigned int nr_mmu_pages; | |
3000 | unsigned int nr_pages = 0; | |
bc6678a3 | 3001 | struct kvm_memslots *slots; |
3ad82a7e | 3002 | |
90d83dc3 LJ |
3003 | slots = kvm_memslots(kvm); |
3004 | ||
bc6678a3 MT |
3005 | for (i = 0; i < slots->nmemslots; i++) |
3006 | nr_pages += slots->memslots[i].npages; | |
3ad82a7e ZX |
3007 | |
3008 | nr_mmu_pages = nr_pages * KVM_PERMILLE_MMU_PAGES / 1000; | |
3009 | nr_mmu_pages = max(nr_mmu_pages, | |
3010 | (unsigned int) KVM_MIN_ALLOC_MMU_PAGES); | |
3011 | ||
3012 | return nr_mmu_pages; | |
3013 | } | |
3014 | ||
2f333bcb MT |
3015 | static void *pv_mmu_peek_buffer(struct kvm_pv_mmu_op_buffer *buffer, |
3016 | unsigned len) | |
3017 | { | |
3018 | if (len > buffer->len) | |
3019 | return NULL; | |
3020 | return buffer->ptr; | |
3021 | } | |
3022 | ||
3023 | static void *pv_mmu_read_buffer(struct kvm_pv_mmu_op_buffer *buffer, | |
3024 | unsigned len) | |
3025 | { | |
3026 | void *ret; | |
3027 | ||
3028 | ret = pv_mmu_peek_buffer(buffer, len); | |
3029 | if (!ret) | |
3030 | return ret; | |
3031 | buffer->ptr += len; | |
3032 | buffer->len -= len; | |
3033 | buffer->processed += len; | |
3034 | return ret; | |
3035 | } | |
3036 | ||
3037 | static int kvm_pv_mmu_write(struct kvm_vcpu *vcpu, | |
3038 | gpa_t addr, gpa_t value) | |
3039 | { | |
3040 | int bytes = 8; | |
3041 | int r; | |
3042 | ||
3043 | if (!is_long_mode(vcpu) && !is_pae(vcpu)) | |
3044 | bytes = 4; | |
3045 | ||
3046 | r = mmu_topup_memory_caches(vcpu); | |
3047 | if (r) | |
3048 | return r; | |
3049 | ||
3200f405 | 3050 | if (!emulator_write_phys(vcpu, addr, &value, bytes)) |
2f333bcb MT |
3051 | return -EFAULT; |
3052 | ||
3053 | return 1; | |
3054 | } | |
3055 | ||
3056 | static int kvm_pv_mmu_flush_tlb(struct kvm_vcpu *vcpu) | |
3057 | { | |
a8cd0244 | 3058 | kvm_set_cr3(vcpu, vcpu->arch.cr3); |
2f333bcb MT |
3059 | return 1; |
3060 | } | |
3061 | ||
3062 | static int kvm_pv_mmu_release_pt(struct kvm_vcpu *vcpu, gpa_t addr) | |
3063 | { | |
3064 | spin_lock(&vcpu->kvm->mmu_lock); | |
3065 | mmu_unshadow(vcpu->kvm, addr >> PAGE_SHIFT); | |
3066 | spin_unlock(&vcpu->kvm->mmu_lock); | |
3067 | return 1; | |
3068 | } | |
3069 | ||
3070 | static int kvm_pv_mmu_op_one(struct kvm_vcpu *vcpu, | |
3071 | struct kvm_pv_mmu_op_buffer *buffer) | |
3072 | { | |
3073 | struct kvm_mmu_op_header *header; | |
3074 | ||
3075 | header = pv_mmu_peek_buffer(buffer, sizeof *header); | |
3076 | if (!header) | |
3077 | return 0; | |
3078 | switch (header->op) { | |
3079 | case KVM_MMU_OP_WRITE_PTE: { | |
3080 | struct kvm_mmu_op_write_pte *wpte; | |
3081 | ||
3082 | wpte = pv_mmu_read_buffer(buffer, sizeof *wpte); | |
3083 | if (!wpte) | |
3084 | return 0; | |
3085 | return kvm_pv_mmu_write(vcpu, wpte->pte_phys, | |
3086 | wpte->pte_val); | |
3087 | } | |
3088 | case KVM_MMU_OP_FLUSH_TLB: { | |
3089 | struct kvm_mmu_op_flush_tlb *ftlb; | |
3090 | ||
3091 | ftlb = pv_mmu_read_buffer(buffer, sizeof *ftlb); | |
3092 | if (!ftlb) | |
3093 | return 0; | |
3094 | return kvm_pv_mmu_flush_tlb(vcpu); | |
3095 | } | |
3096 | case KVM_MMU_OP_RELEASE_PT: { | |
3097 | struct kvm_mmu_op_release_pt *rpt; | |
3098 | ||
3099 | rpt = pv_mmu_read_buffer(buffer, sizeof *rpt); | |
3100 | if (!rpt) | |
3101 | return 0; | |
3102 | return kvm_pv_mmu_release_pt(vcpu, rpt->pt_phys); | |
3103 | } | |
3104 | default: return 0; | |
3105 | } | |
3106 | } | |
3107 | ||
3108 | int kvm_pv_mmu_op(struct kvm_vcpu *vcpu, unsigned long bytes, | |
3109 | gpa_t addr, unsigned long *ret) | |
3110 | { | |
3111 | int r; | |
6ad18fba | 3112 | struct kvm_pv_mmu_op_buffer *buffer = &vcpu->arch.mmu_op_buffer; |
2f333bcb | 3113 | |
6ad18fba DH |
3114 | buffer->ptr = buffer->buf; |
3115 | buffer->len = min_t(unsigned long, bytes, sizeof buffer->buf); | |
3116 | buffer->processed = 0; | |
2f333bcb | 3117 | |
6ad18fba | 3118 | r = kvm_read_guest(vcpu->kvm, addr, buffer->buf, buffer->len); |
2f333bcb MT |
3119 | if (r) |
3120 | goto out; | |
3121 | ||
6ad18fba DH |
3122 | while (buffer->len) { |
3123 | r = kvm_pv_mmu_op_one(vcpu, buffer); | |
2f333bcb MT |
3124 | if (r < 0) |
3125 | goto out; | |
3126 | if (r == 0) | |
3127 | break; | |
3128 | } | |
3129 | ||
3130 | r = 1; | |
3131 | out: | |
6ad18fba | 3132 | *ret = buffer->processed; |
2f333bcb MT |
3133 | return r; |
3134 | } | |
3135 | ||
94d8b056 MT |
3136 | int kvm_mmu_get_spte_hierarchy(struct kvm_vcpu *vcpu, u64 addr, u64 sptes[4]) |
3137 | { | |
3138 | struct kvm_shadow_walk_iterator iterator; | |
3139 | int nr_sptes = 0; | |
3140 | ||
3141 | spin_lock(&vcpu->kvm->mmu_lock); | |
3142 | for_each_shadow_entry(vcpu, addr, iterator) { | |
3143 | sptes[iterator.level-1] = *iterator.sptep; | |
3144 | nr_sptes++; | |
3145 | if (!is_shadow_present_pte(*iterator.sptep)) | |
3146 | break; | |
3147 | } | |
3148 | spin_unlock(&vcpu->kvm->mmu_lock); | |
3149 | ||
3150 | return nr_sptes; | |
3151 | } | |
3152 | EXPORT_SYMBOL_GPL(kvm_mmu_get_spte_hierarchy); | |
3153 | ||
37a7d8b0 AK |
3154 | #ifdef AUDIT |
3155 | ||
3156 | static const char *audit_msg; | |
3157 | ||
3158 | static gva_t canonicalize(gva_t gva) | |
3159 | { | |
3160 | #ifdef CONFIG_X86_64 | |
3161 | gva = (long long)(gva << 16) >> 16; | |
3162 | #endif | |
3163 | return gva; | |
3164 | } | |
3165 | ||
08a3732b | 3166 | |
805d32de | 3167 | typedef void (*inspect_spte_fn) (struct kvm *kvm, u64 *sptep); |
08a3732b MT |
3168 | |
3169 | static void __mmu_spte_walk(struct kvm *kvm, struct kvm_mmu_page *sp, | |
3170 | inspect_spte_fn fn) | |
3171 | { | |
3172 | int i; | |
3173 | ||
3174 | for (i = 0; i < PT64_ENT_PER_PAGE; ++i) { | |
3175 | u64 ent = sp->spt[i]; | |
3176 | ||
3177 | if (is_shadow_present_pte(ent)) { | |
2920d728 | 3178 | if (!is_last_spte(ent, sp->role.level)) { |
08a3732b MT |
3179 | struct kvm_mmu_page *child; |
3180 | child = page_header(ent & PT64_BASE_ADDR_MASK); | |
3181 | __mmu_spte_walk(kvm, child, fn); | |
2920d728 | 3182 | } else |
805d32de | 3183 | fn(kvm, &sp->spt[i]); |
08a3732b MT |
3184 | } |
3185 | } | |
3186 | } | |
3187 | ||
3188 | static void mmu_spte_walk(struct kvm_vcpu *vcpu, inspect_spte_fn fn) | |
3189 | { | |
3190 | int i; | |
3191 | struct kvm_mmu_page *sp; | |
3192 | ||
3193 | if (!VALID_PAGE(vcpu->arch.mmu.root_hpa)) | |
3194 | return; | |
3195 | if (vcpu->arch.mmu.shadow_root_level == PT64_ROOT_LEVEL) { | |
3196 | hpa_t root = vcpu->arch.mmu.root_hpa; | |
3197 | sp = page_header(root); | |
3198 | __mmu_spte_walk(vcpu->kvm, sp, fn); | |
3199 | return; | |
3200 | } | |
3201 | for (i = 0; i < 4; ++i) { | |
3202 | hpa_t root = vcpu->arch.mmu.pae_root[i]; | |
3203 | ||
3204 | if (root && VALID_PAGE(root)) { | |
3205 | root &= PT64_BASE_ADDR_MASK; | |
3206 | sp = page_header(root); | |
3207 | __mmu_spte_walk(vcpu->kvm, sp, fn); | |
3208 | } | |
3209 | } | |
3210 | return; | |
3211 | } | |
3212 | ||
37a7d8b0 AK |
3213 | static void audit_mappings_page(struct kvm_vcpu *vcpu, u64 page_pte, |
3214 | gva_t va, int level) | |
3215 | { | |
3216 | u64 *pt = __va(page_pte & PT64_BASE_ADDR_MASK); | |
3217 | int i; | |
3218 | gva_t va_delta = 1ul << (PAGE_SHIFT + 9 * (level - 1)); | |
3219 | ||
3220 | for (i = 0; i < PT64_ENT_PER_PAGE; ++i, va += va_delta) { | |
3221 | u64 ent = pt[i]; | |
3222 | ||
c7addb90 | 3223 | if (ent == shadow_trap_nonpresent_pte) |
37a7d8b0 AK |
3224 | continue; |
3225 | ||
3226 | va = canonicalize(va); | |
2920d728 MT |
3227 | if (is_shadow_present_pte(ent) && !is_last_spte(ent, level)) |
3228 | audit_mappings_page(vcpu, ent, va, level - 1); | |
3229 | else { | |
1871c602 | 3230 | gpa_t gpa = kvm_mmu_gva_to_gpa_read(vcpu, va, NULL); |
34382539 JK |
3231 | gfn_t gfn = gpa >> PAGE_SHIFT; |
3232 | pfn_t pfn = gfn_to_pfn(vcpu->kvm, gfn); | |
3233 | hpa_t hpa = (hpa_t)pfn << PAGE_SHIFT; | |
37a7d8b0 | 3234 | |
2aaf65e8 MT |
3235 | if (is_error_pfn(pfn)) { |
3236 | kvm_release_pfn_clean(pfn); | |
3237 | continue; | |
3238 | } | |
3239 | ||
c7addb90 | 3240 | if (is_shadow_present_pte(ent) |
37a7d8b0 | 3241 | && (ent & PT64_BASE_ADDR_MASK) != hpa) |
c7addb90 AK |
3242 | printk(KERN_ERR "xx audit error: (%s) levels %d" |
3243 | " gva %lx gpa %llx hpa %llx ent %llx %d\n", | |
ad312c7c | 3244 | audit_msg, vcpu->arch.mmu.root_level, |
d77c26fc MD |
3245 | va, gpa, hpa, ent, |
3246 | is_shadow_present_pte(ent)); | |
c7addb90 AK |
3247 | else if (ent == shadow_notrap_nonpresent_pte |
3248 | && !is_error_hpa(hpa)) | |
3249 | printk(KERN_ERR "audit: (%s) notrap shadow," | |
3250 | " valid guest gva %lx\n", audit_msg, va); | |
35149e21 | 3251 | kvm_release_pfn_clean(pfn); |
c7addb90 | 3252 | |
37a7d8b0 AK |
3253 | } |
3254 | } | |
3255 | } | |
3256 | ||
3257 | static void audit_mappings(struct kvm_vcpu *vcpu) | |
3258 | { | |
1ea252af | 3259 | unsigned i; |
37a7d8b0 | 3260 | |
ad312c7c ZX |
3261 | if (vcpu->arch.mmu.root_level == 4) |
3262 | audit_mappings_page(vcpu, vcpu->arch.mmu.root_hpa, 0, 4); | |
37a7d8b0 AK |
3263 | else |
3264 | for (i = 0; i < 4; ++i) | |
ad312c7c | 3265 | if (vcpu->arch.mmu.pae_root[i] & PT_PRESENT_MASK) |
37a7d8b0 | 3266 | audit_mappings_page(vcpu, |
ad312c7c | 3267 | vcpu->arch.mmu.pae_root[i], |
37a7d8b0 AK |
3268 | i << 30, |
3269 | 2); | |
3270 | } | |
3271 | ||
3272 | static int count_rmaps(struct kvm_vcpu *vcpu) | |
3273 | { | |
805d32de XG |
3274 | struct kvm *kvm = vcpu->kvm; |
3275 | struct kvm_memslots *slots; | |
37a7d8b0 | 3276 | int nmaps = 0; |
bc6678a3 | 3277 | int i, j, k, idx; |
37a7d8b0 | 3278 | |
bc6678a3 | 3279 | idx = srcu_read_lock(&kvm->srcu); |
90d83dc3 | 3280 | slots = kvm_memslots(kvm); |
37a7d8b0 | 3281 | for (i = 0; i < KVM_MEMORY_SLOTS; ++i) { |
bc6678a3 | 3282 | struct kvm_memory_slot *m = &slots->memslots[i]; |
37a7d8b0 AK |
3283 | struct kvm_rmap_desc *d; |
3284 | ||
3285 | for (j = 0; j < m->npages; ++j) { | |
290fc38d | 3286 | unsigned long *rmapp = &m->rmap[j]; |
37a7d8b0 | 3287 | |
290fc38d | 3288 | if (!*rmapp) |
37a7d8b0 | 3289 | continue; |
290fc38d | 3290 | if (!(*rmapp & 1)) { |
37a7d8b0 AK |
3291 | ++nmaps; |
3292 | continue; | |
3293 | } | |
290fc38d | 3294 | d = (struct kvm_rmap_desc *)(*rmapp & ~1ul); |
37a7d8b0 AK |
3295 | while (d) { |
3296 | for (k = 0; k < RMAP_EXT; ++k) | |
d555c333 | 3297 | if (d->sptes[k]) |
37a7d8b0 AK |
3298 | ++nmaps; |
3299 | else | |
3300 | break; | |
3301 | d = d->more; | |
3302 | } | |
3303 | } | |
3304 | } | |
bc6678a3 | 3305 | srcu_read_unlock(&kvm->srcu, idx); |
37a7d8b0 AK |
3306 | return nmaps; |
3307 | } | |
3308 | ||
805d32de | 3309 | void inspect_spte_has_rmap(struct kvm *kvm, u64 *sptep) |
08a3732b MT |
3310 | { |
3311 | unsigned long *rmapp; | |
3312 | struct kvm_mmu_page *rev_sp; | |
3313 | gfn_t gfn; | |
3314 | ||
3315 | if (*sptep & PT_WRITABLE_MASK) { | |
3316 | rev_sp = page_header(__pa(sptep)); | |
3317 | gfn = rev_sp->gfns[sptep - rev_sp->spt]; | |
3318 | ||
3319 | if (!gfn_to_memslot(kvm, gfn)) { | |
3320 | if (!printk_ratelimit()) | |
3321 | return; | |
3322 | printk(KERN_ERR "%s: no memslot for gfn %ld\n", | |
3323 | audit_msg, gfn); | |
3324 | printk(KERN_ERR "%s: index %ld of sp (gfn=%lx)\n", | |
805d32de | 3325 | audit_msg, (long int)(sptep - rev_sp->spt), |
08a3732b MT |
3326 | rev_sp->gfn); |
3327 | dump_stack(); | |
3328 | return; | |
3329 | } | |
3330 | ||
2920d728 | 3331 | rmapp = gfn_to_rmap(kvm, rev_sp->gfns[sptep - rev_sp->spt], |
805d32de | 3332 | rev_sp->role.level); |
08a3732b MT |
3333 | if (!*rmapp) { |
3334 | if (!printk_ratelimit()) | |
3335 | return; | |
3336 | printk(KERN_ERR "%s: no rmap for writable spte %llx\n", | |
3337 | audit_msg, *sptep); | |
3338 | dump_stack(); | |
3339 | } | |
3340 | } | |
3341 | ||
3342 | } | |
3343 | ||
3344 | void audit_writable_sptes_have_rmaps(struct kvm_vcpu *vcpu) | |
3345 | { | |
3346 | mmu_spte_walk(vcpu, inspect_spte_has_rmap); | |
3347 | } | |
3348 | ||
3349 | static void check_writable_mappings_rmap(struct kvm_vcpu *vcpu) | |
37a7d8b0 | 3350 | { |
4db35314 | 3351 | struct kvm_mmu_page *sp; |
37a7d8b0 AK |
3352 | int i; |
3353 | ||
f05e70ac | 3354 | list_for_each_entry(sp, &vcpu->kvm->arch.active_mmu_pages, link) { |
4db35314 | 3355 | u64 *pt = sp->spt; |
37a7d8b0 | 3356 | |
4db35314 | 3357 | if (sp->role.level != PT_PAGE_TABLE_LEVEL) |
37a7d8b0 AK |
3358 | continue; |
3359 | ||
3360 | for (i = 0; i < PT64_ENT_PER_PAGE; ++i) { | |
3361 | u64 ent = pt[i]; | |
3362 | ||
3363 | if (!(ent & PT_PRESENT_MASK)) | |
3364 | continue; | |
3365 | if (!(ent & PT_WRITABLE_MASK)) | |
3366 | continue; | |
805d32de | 3367 | inspect_spte_has_rmap(vcpu->kvm, &pt[i]); |
37a7d8b0 AK |
3368 | } |
3369 | } | |
08a3732b | 3370 | return; |
37a7d8b0 AK |
3371 | } |
3372 | ||
3373 | static void audit_rmap(struct kvm_vcpu *vcpu) | |
3374 | { | |
08a3732b MT |
3375 | check_writable_mappings_rmap(vcpu); |
3376 | count_rmaps(vcpu); | |
37a7d8b0 AK |
3377 | } |
3378 | ||
3379 | static void audit_write_protection(struct kvm_vcpu *vcpu) | |
3380 | { | |
4db35314 | 3381 | struct kvm_mmu_page *sp; |
290fc38d IE |
3382 | struct kvm_memory_slot *slot; |
3383 | unsigned long *rmapp; | |
e58b0f9e | 3384 | u64 *spte; |
290fc38d | 3385 | gfn_t gfn; |
37a7d8b0 | 3386 | |
f05e70ac | 3387 | list_for_each_entry(sp, &vcpu->kvm->arch.active_mmu_pages, link) { |
f6e2c02b | 3388 | if (sp->role.direct) |
37a7d8b0 | 3389 | continue; |
e58b0f9e MT |
3390 | if (sp->unsync) |
3391 | continue; | |
37a7d8b0 | 3392 | |
4db35314 | 3393 | gfn = unalias_gfn(vcpu->kvm, sp->gfn); |
2843099f | 3394 | slot = gfn_to_memslot_unaliased(vcpu->kvm, sp->gfn); |
290fc38d | 3395 | rmapp = &slot->rmap[gfn - slot->base_gfn]; |
e58b0f9e MT |
3396 | |
3397 | spte = rmap_next(vcpu->kvm, rmapp, NULL); | |
3398 | while (spte) { | |
3399 | if (*spte & PT_WRITABLE_MASK) | |
3400 | printk(KERN_ERR "%s: (%s) shadow page has " | |
3401 | "writable mappings: gfn %lx role %x\n", | |
b8688d51 | 3402 | __func__, audit_msg, sp->gfn, |
4db35314 | 3403 | sp->role.word); |
e58b0f9e MT |
3404 | spte = rmap_next(vcpu->kvm, rmapp, spte); |
3405 | } | |
37a7d8b0 AK |
3406 | } |
3407 | } | |
3408 | ||
3409 | static void kvm_mmu_audit(struct kvm_vcpu *vcpu, const char *msg) | |
3410 | { | |
3411 | int olddbg = dbg; | |
3412 | ||
3413 | dbg = 0; | |
3414 | audit_msg = msg; | |
3415 | audit_rmap(vcpu); | |
3416 | audit_write_protection(vcpu); | |
2aaf65e8 MT |
3417 | if (strcmp("pre pte write", audit_msg) != 0) |
3418 | audit_mappings(vcpu); | |
08a3732b | 3419 | audit_writable_sptes_have_rmaps(vcpu); |
37a7d8b0 AK |
3420 | dbg = olddbg; |
3421 | } | |
3422 | ||
3423 | #endif |