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. | |
9611c187 | 10 | * Copyright 2010 Red Hat, Inc. and/or its affiliates. |
6aa8b732 AK |
11 | * |
12 | * Authors: | |
13 | * Yaniv Kamay <yaniv@qumranet.com> | |
14 | * Avi Kivity <avi@qumranet.com> | |
15 | * | |
16 | * This work is licensed under the terms of the GNU GPL, version 2. See | |
17 | * the COPYING file in the top-level directory. | |
18 | * | |
19 | */ | |
e495606d | 20 | |
af585b92 | 21 | #include "irq.h" |
1d737c8a | 22 | #include "mmu.h" |
836a1b3c | 23 | #include "x86.h" |
6de4f3ad | 24 | #include "kvm_cache_regs.h" |
e495606d | 25 | |
edf88417 | 26 | #include <linux/kvm_host.h> |
6aa8b732 AK |
27 | #include <linux/types.h> |
28 | #include <linux/string.h> | |
6aa8b732 AK |
29 | #include <linux/mm.h> |
30 | #include <linux/highmem.h> | |
31 | #include <linux/module.h> | |
448353ca | 32 | #include <linux/swap.h> |
05da4558 | 33 | #include <linux/hugetlb.h> |
2f333bcb | 34 | #include <linux/compiler.h> |
bc6678a3 | 35 | #include <linux/srcu.h> |
5a0e3ad6 | 36 | #include <linux/slab.h> |
bf998156 | 37 | #include <linux/uaccess.h> |
6aa8b732 | 38 | |
e495606d AK |
39 | #include <asm/page.h> |
40 | #include <asm/cmpxchg.h> | |
4e542370 | 41 | #include <asm/io.h> |
13673a90 | 42 | #include <asm/vmx.h> |
6aa8b732 | 43 | |
18552672 JR |
44 | /* |
45 | * When setting this variable to true it enables Two-Dimensional-Paging | |
46 | * where the hardware walks 2 page tables: | |
47 | * 1. the guest-virtual to guest-physical | |
48 | * 2. while doing 1. it walks guest-physical to host-physical | |
49 | * If the hardware supports that we don't need to do shadow paging. | |
50 | */ | |
2f333bcb | 51 | bool tdp_enabled = false; |
18552672 | 52 | |
8b1fe17c XG |
53 | enum { |
54 | AUDIT_PRE_PAGE_FAULT, | |
55 | AUDIT_POST_PAGE_FAULT, | |
56 | AUDIT_PRE_PTE_WRITE, | |
6903074c XG |
57 | AUDIT_POST_PTE_WRITE, |
58 | AUDIT_PRE_SYNC, | |
59 | AUDIT_POST_SYNC | |
8b1fe17c | 60 | }; |
37a7d8b0 | 61 | |
8b1fe17c XG |
62 | char *audit_point_name[] = { |
63 | "pre page fault", | |
64 | "post page fault", | |
65 | "pre pte write", | |
6903074c XG |
66 | "post pte write", |
67 | "pre sync", | |
68 | "post sync" | |
8b1fe17c | 69 | }; |
37a7d8b0 | 70 | |
8b1fe17c | 71 | #undef MMU_DEBUG |
37a7d8b0 AK |
72 | |
73 | #ifdef MMU_DEBUG | |
74 | ||
75 | #define pgprintk(x...) do { if (dbg) printk(x); } while (0) | |
76 | #define rmap_printk(x...) do { if (dbg) printk(x); } while (0) | |
77 | ||
78 | #else | |
79 | ||
80 | #define pgprintk(x...) do { } while (0) | |
81 | #define rmap_printk(x...) do { } while (0) | |
82 | ||
83 | #endif | |
84 | ||
8b1fe17c | 85 | #ifdef MMU_DEBUG |
6ada8cca AK |
86 | static int dbg = 0; |
87 | module_param(dbg, bool, 0644); | |
37a7d8b0 | 88 | #endif |
6aa8b732 | 89 | |
582801a9 MT |
90 | static int oos_shadow = 1; |
91 | module_param(oos_shadow, bool, 0644); | |
92 | ||
d6c69ee9 YD |
93 | #ifndef MMU_DEBUG |
94 | #define ASSERT(x) do { } while (0) | |
95 | #else | |
6aa8b732 AK |
96 | #define ASSERT(x) \ |
97 | if (!(x)) { \ | |
98 | printk(KERN_WARNING "assertion failed %s:%d: %s\n", \ | |
99 | __FILE__, __LINE__, #x); \ | |
100 | } | |
d6c69ee9 | 101 | #endif |
6aa8b732 | 102 | |
957ed9ef XG |
103 | #define PTE_PREFETCH_NUM 8 |
104 | ||
6aa8b732 AK |
105 | #define PT_FIRST_AVAIL_BITS_SHIFT 9 |
106 | #define PT64_SECOND_AVAIL_BITS_SHIFT 52 | |
107 | ||
6aa8b732 AK |
108 | #define PT64_LEVEL_BITS 9 |
109 | ||
110 | #define PT64_LEVEL_SHIFT(level) \ | |
d77c26fc | 111 | (PAGE_SHIFT + (level - 1) * PT64_LEVEL_BITS) |
6aa8b732 | 112 | |
6aa8b732 AK |
113 | #define PT64_INDEX(address, level)\ |
114 | (((address) >> PT64_LEVEL_SHIFT(level)) & ((1 << PT64_LEVEL_BITS) - 1)) | |
115 | ||
116 | ||
117 | #define PT32_LEVEL_BITS 10 | |
118 | ||
119 | #define PT32_LEVEL_SHIFT(level) \ | |
d77c26fc | 120 | (PAGE_SHIFT + (level - 1) * PT32_LEVEL_BITS) |
6aa8b732 | 121 | |
e04da980 JR |
122 | #define PT32_LVL_OFFSET_MASK(level) \ |
123 | (PT32_BASE_ADDR_MASK & ((1ULL << (PAGE_SHIFT + (((level) - 1) \ | |
124 | * PT32_LEVEL_BITS))) - 1)) | |
6aa8b732 AK |
125 | |
126 | #define PT32_INDEX(address, level)\ | |
127 | (((address) >> PT32_LEVEL_SHIFT(level)) & ((1 << PT32_LEVEL_BITS) - 1)) | |
128 | ||
129 | ||
27aba766 | 130 | #define PT64_BASE_ADDR_MASK (((1ULL << 52) - 1) & ~(u64)(PAGE_SIZE-1)) |
6aa8b732 AK |
131 | #define PT64_DIR_BASE_ADDR_MASK \ |
132 | (PT64_BASE_ADDR_MASK & ~((1ULL << (PAGE_SHIFT + PT64_LEVEL_BITS)) - 1)) | |
e04da980 JR |
133 | #define PT64_LVL_ADDR_MASK(level) \ |
134 | (PT64_BASE_ADDR_MASK & ~((1ULL << (PAGE_SHIFT + (((level) - 1) \ | |
135 | * PT64_LEVEL_BITS))) - 1)) | |
136 | #define PT64_LVL_OFFSET_MASK(level) \ | |
137 | (PT64_BASE_ADDR_MASK & ((1ULL << (PAGE_SHIFT + (((level) - 1) \ | |
138 | * PT64_LEVEL_BITS))) - 1)) | |
6aa8b732 AK |
139 | |
140 | #define PT32_BASE_ADDR_MASK PAGE_MASK | |
141 | #define PT32_DIR_BASE_ADDR_MASK \ | |
142 | (PAGE_MASK & ~((1ULL << (PAGE_SHIFT + PT32_LEVEL_BITS)) - 1)) | |
e04da980 JR |
143 | #define PT32_LVL_ADDR_MASK(level) \ |
144 | (PAGE_MASK & ~((1ULL << (PAGE_SHIFT + (((level) - 1) \ | |
145 | * PT32_LEVEL_BITS))) - 1)) | |
6aa8b732 | 146 | |
79539cec AK |
147 | #define PT64_PERM_MASK (PT_PRESENT_MASK | PT_WRITABLE_MASK | PT_USER_MASK \ |
148 | | PT64_NX_MASK) | |
6aa8b732 | 149 | |
53c07b18 | 150 | #define PTE_LIST_EXT 4 |
cd4a4e53 | 151 | |
fe135d2c AK |
152 | #define ACC_EXEC_MASK 1 |
153 | #define ACC_WRITE_MASK PT_WRITABLE_MASK | |
154 | #define ACC_USER_MASK PT_USER_MASK | |
155 | #define ACC_ALL (ACC_EXEC_MASK | ACC_WRITE_MASK | ACC_USER_MASK) | |
156 | ||
90bb6fc5 AK |
157 | #include <trace/events/kvm.h> |
158 | ||
07420171 AK |
159 | #define CREATE_TRACE_POINTS |
160 | #include "mmutrace.h" | |
161 | ||
1403283a IE |
162 | #define SPTE_HOST_WRITEABLE (1ULL << PT_FIRST_AVAIL_BITS_SHIFT) |
163 | ||
135f8c2b AK |
164 | #define SHADOW_PT_INDEX(addr, level) PT64_INDEX(addr, level) |
165 | ||
53c07b18 XG |
166 | struct pte_list_desc { |
167 | u64 *sptes[PTE_LIST_EXT]; | |
168 | struct pte_list_desc *more; | |
cd4a4e53 AK |
169 | }; |
170 | ||
2d11123a AK |
171 | struct kvm_shadow_walk_iterator { |
172 | u64 addr; | |
173 | hpa_t shadow_addr; | |
2d11123a | 174 | u64 *sptep; |
dd3bfd59 | 175 | int level; |
2d11123a AK |
176 | unsigned index; |
177 | }; | |
178 | ||
179 | #define for_each_shadow_entry(_vcpu, _addr, _walker) \ | |
180 | for (shadow_walk_init(&(_walker), _vcpu, _addr); \ | |
181 | shadow_walk_okay(&(_walker)); \ | |
182 | shadow_walk_next(&(_walker))) | |
183 | ||
c2a2ac2b XG |
184 | #define for_each_shadow_entry_lockless(_vcpu, _addr, _walker, spte) \ |
185 | for (shadow_walk_init(&(_walker), _vcpu, _addr); \ | |
186 | shadow_walk_okay(&(_walker)) && \ | |
187 | ({ spte = mmu_spte_get_lockless(_walker.sptep); 1; }); \ | |
188 | __shadow_walk_next(&(_walker), spte)) | |
189 | ||
53c07b18 | 190 | static struct kmem_cache *pte_list_desc_cache; |
d3d25b04 | 191 | static struct kmem_cache *mmu_page_header_cache; |
45221ab6 | 192 | static struct percpu_counter kvm_total_used_mmu_pages; |
b5a33a75 | 193 | |
7b52345e SY |
194 | static u64 __read_mostly shadow_nx_mask; |
195 | static u64 __read_mostly shadow_x_mask; /* mutual exclusive with nx_mask */ | |
196 | static u64 __read_mostly shadow_user_mask; | |
197 | static u64 __read_mostly shadow_accessed_mask; | |
198 | static u64 __read_mostly shadow_dirty_mask; | |
ce88decf XG |
199 | static u64 __read_mostly shadow_mmio_mask; |
200 | ||
201 | static void mmu_spte_set(u64 *sptep, u64 spte); | |
202 | ||
203 | void kvm_mmu_set_mmio_spte_mask(u64 mmio_mask) | |
204 | { | |
205 | shadow_mmio_mask = mmio_mask; | |
206 | } | |
207 | EXPORT_SYMBOL_GPL(kvm_mmu_set_mmio_spte_mask); | |
208 | ||
209 | static void mark_mmio_spte(u64 *sptep, u64 gfn, unsigned access) | |
210 | { | |
211 | access &= ACC_WRITE_MASK | ACC_USER_MASK; | |
212 | ||
4f022648 | 213 | trace_mark_mmio_spte(sptep, gfn, access); |
ce88decf XG |
214 | mmu_spte_set(sptep, shadow_mmio_mask | access | gfn << PAGE_SHIFT); |
215 | } | |
216 | ||
217 | static bool is_mmio_spte(u64 spte) | |
218 | { | |
219 | return (spte & shadow_mmio_mask) == shadow_mmio_mask; | |
220 | } | |
221 | ||
222 | static gfn_t get_mmio_spte_gfn(u64 spte) | |
223 | { | |
224 | return (spte & ~shadow_mmio_mask) >> PAGE_SHIFT; | |
225 | } | |
226 | ||
227 | static unsigned get_mmio_spte_access(u64 spte) | |
228 | { | |
229 | return (spte & ~shadow_mmio_mask) & ~PAGE_MASK; | |
230 | } | |
231 | ||
232 | static bool set_mmio_spte(u64 *sptep, gfn_t gfn, pfn_t pfn, unsigned access) | |
233 | { | |
234 | if (unlikely(is_noslot_pfn(pfn))) { | |
235 | mark_mmio_spte(sptep, gfn, access); | |
236 | return true; | |
237 | } | |
238 | ||
239 | return false; | |
240 | } | |
c7addb90 | 241 | |
82725b20 DE |
242 | static inline u64 rsvd_bits(int s, int e) |
243 | { | |
244 | return ((1ULL << (e - s + 1)) - 1) << s; | |
245 | } | |
246 | ||
7b52345e | 247 | void kvm_mmu_set_mask_ptes(u64 user_mask, u64 accessed_mask, |
4b12f0de | 248 | u64 dirty_mask, u64 nx_mask, u64 x_mask) |
7b52345e SY |
249 | { |
250 | shadow_user_mask = user_mask; | |
251 | shadow_accessed_mask = accessed_mask; | |
252 | shadow_dirty_mask = dirty_mask; | |
253 | shadow_nx_mask = nx_mask; | |
254 | shadow_x_mask = x_mask; | |
255 | } | |
256 | EXPORT_SYMBOL_GPL(kvm_mmu_set_mask_ptes); | |
257 | ||
6aa8b732 AK |
258 | static int is_cpuid_PSE36(void) |
259 | { | |
260 | return 1; | |
261 | } | |
262 | ||
73b1087e AK |
263 | static int is_nx(struct kvm_vcpu *vcpu) |
264 | { | |
f6801dff | 265 | return vcpu->arch.efer & EFER_NX; |
73b1087e AK |
266 | } |
267 | ||
c7addb90 AK |
268 | static int is_shadow_present_pte(u64 pte) |
269 | { | |
ce88decf | 270 | return pte & PT_PRESENT_MASK && !is_mmio_spte(pte); |
c7addb90 AK |
271 | } |
272 | ||
05da4558 MT |
273 | static int is_large_pte(u64 pte) |
274 | { | |
275 | return pte & PT_PAGE_SIZE_MASK; | |
276 | } | |
277 | ||
43a3795a | 278 | static int is_dirty_gpte(unsigned long pte) |
e3c5e7ec | 279 | { |
439e218a | 280 | return pte & PT_DIRTY_MASK; |
e3c5e7ec AK |
281 | } |
282 | ||
43a3795a | 283 | static int is_rmap_spte(u64 pte) |
cd4a4e53 | 284 | { |
4b1a80fa | 285 | return is_shadow_present_pte(pte); |
cd4a4e53 AK |
286 | } |
287 | ||
776e6633 MT |
288 | static int is_last_spte(u64 pte, int level) |
289 | { | |
290 | if (level == PT_PAGE_TABLE_LEVEL) | |
291 | return 1; | |
852e3c19 | 292 | if (is_large_pte(pte)) |
776e6633 MT |
293 | return 1; |
294 | return 0; | |
295 | } | |
296 | ||
35149e21 | 297 | static pfn_t spte_to_pfn(u64 pte) |
0b49ea86 | 298 | { |
35149e21 | 299 | return (pte & PT64_BASE_ADDR_MASK) >> PAGE_SHIFT; |
0b49ea86 AK |
300 | } |
301 | ||
da928521 AK |
302 | static gfn_t pse36_gfn_delta(u32 gpte) |
303 | { | |
304 | int shift = 32 - PT32_DIR_PSE36_SHIFT - PAGE_SHIFT; | |
305 | ||
306 | return (gpte & PT32_DIR_PSE36_MASK) << shift; | |
307 | } | |
308 | ||
603e0651 | 309 | #ifdef CONFIG_X86_64 |
d555c333 | 310 | static void __set_spte(u64 *sptep, u64 spte) |
e663ee64 | 311 | { |
603e0651 | 312 | *sptep = spte; |
e663ee64 AK |
313 | } |
314 | ||
603e0651 | 315 | static void __update_clear_spte_fast(u64 *sptep, u64 spte) |
a9221dd5 | 316 | { |
603e0651 XG |
317 | *sptep = spte; |
318 | } | |
319 | ||
320 | static u64 __update_clear_spte_slow(u64 *sptep, u64 spte) | |
321 | { | |
322 | return xchg(sptep, spte); | |
323 | } | |
c2a2ac2b XG |
324 | |
325 | static u64 __get_spte_lockless(u64 *sptep) | |
326 | { | |
327 | return ACCESS_ONCE(*sptep); | |
328 | } | |
ce88decf XG |
329 | |
330 | static bool __check_direct_spte_mmio_pf(u64 spte) | |
331 | { | |
332 | /* It is valid if the spte is zapped. */ | |
333 | return spte == 0ull; | |
334 | } | |
a9221dd5 | 335 | #else |
603e0651 XG |
336 | union split_spte { |
337 | struct { | |
338 | u32 spte_low; | |
339 | u32 spte_high; | |
340 | }; | |
341 | u64 spte; | |
342 | }; | |
a9221dd5 | 343 | |
c2a2ac2b XG |
344 | static void count_spte_clear(u64 *sptep, u64 spte) |
345 | { | |
346 | struct kvm_mmu_page *sp = page_header(__pa(sptep)); | |
347 | ||
348 | if (is_shadow_present_pte(spte)) | |
349 | return; | |
350 | ||
351 | /* Ensure the spte is completely set before we increase the count */ | |
352 | smp_wmb(); | |
353 | sp->clear_spte_count++; | |
354 | } | |
355 | ||
603e0651 XG |
356 | static void __set_spte(u64 *sptep, u64 spte) |
357 | { | |
358 | union split_spte *ssptep, sspte; | |
a9221dd5 | 359 | |
603e0651 XG |
360 | ssptep = (union split_spte *)sptep; |
361 | sspte = (union split_spte)spte; | |
362 | ||
363 | ssptep->spte_high = sspte.spte_high; | |
364 | ||
365 | /* | |
366 | * If we map the spte from nonpresent to present, We should store | |
367 | * the high bits firstly, then set present bit, so cpu can not | |
368 | * fetch this spte while we are setting the spte. | |
369 | */ | |
370 | smp_wmb(); | |
371 | ||
372 | ssptep->spte_low = sspte.spte_low; | |
a9221dd5 AK |
373 | } |
374 | ||
603e0651 XG |
375 | static void __update_clear_spte_fast(u64 *sptep, u64 spte) |
376 | { | |
377 | union split_spte *ssptep, sspte; | |
378 | ||
379 | ssptep = (union split_spte *)sptep; | |
380 | sspte = (union split_spte)spte; | |
381 | ||
382 | ssptep->spte_low = sspte.spte_low; | |
383 | ||
384 | /* | |
385 | * If we map the spte from present to nonpresent, we should clear | |
386 | * present bit firstly to avoid vcpu fetch the old high bits. | |
387 | */ | |
388 | smp_wmb(); | |
389 | ||
390 | ssptep->spte_high = sspte.spte_high; | |
c2a2ac2b | 391 | count_spte_clear(sptep, spte); |
603e0651 XG |
392 | } |
393 | ||
394 | static u64 __update_clear_spte_slow(u64 *sptep, u64 spte) | |
395 | { | |
396 | union split_spte *ssptep, sspte, orig; | |
397 | ||
398 | ssptep = (union split_spte *)sptep; | |
399 | sspte = (union split_spte)spte; | |
400 | ||
401 | /* xchg acts as a barrier before the setting of the high bits */ | |
402 | orig.spte_low = xchg(&ssptep->spte_low, sspte.spte_low); | |
41bc3186 ZJ |
403 | orig.spte_high = ssptep->spte_high; |
404 | ssptep->spte_high = sspte.spte_high; | |
c2a2ac2b | 405 | count_spte_clear(sptep, spte); |
603e0651 XG |
406 | |
407 | return orig.spte; | |
408 | } | |
c2a2ac2b XG |
409 | |
410 | /* | |
411 | * The idea using the light way get the spte on x86_32 guest is from | |
412 | * gup_get_pte(arch/x86/mm/gup.c). | |
413 | * The difference is we can not catch the spte tlb flush if we leave | |
414 | * guest mode, so we emulate it by increase clear_spte_count when spte | |
415 | * is cleared. | |
416 | */ | |
417 | static u64 __get_spte_lockless(u64 *sptep) | |
418 | { | |
419 | struct kvm_mmu_page *sp = page_header(__pa(sptep)); | |
420 | union split_spte spte, *orig = (union split_spte *)sptep; | |
421 | int count; | |
422 | ||
423 | retry: | |
424 | count = sp->clear_spte_count; | |
425 | smp_rmb(); | |
426 | ||
427 | spte.spte_low = orig->spte_low; | |
428 | smp_rmb(); | |
429 | ||
430 | spte.spte_high = orig->spte_high; | |
431 | smp_rmb(); | |
432 | ||
433 | if (unlikely(spte.spte_low != orig->spte_low || | |
434 | count != sp->clear_spte_count)) | |
435 | goto retry; | |
436 | ||
437 | return spte.spte; | |
438 | } | |
ce88decf XG |
439 | |
440 | static bool __check_direct_spte_mmio_pf(u64 spte) | |
441 | { | |
442 | union split_spte sspte = (union split_spte)spte; | |
443 | u32 high_mmio_mask = shadow_mmio_mask >> 32; | |
444 | ||
445 | /* It is valid if the spte is zapped. */ | |
446 | if (spte == 0ull) | |
447 | return true; | |
448 | ||
449 | /* It is valid if the spte is being zapped. */ | |
450 | if (sspte.spte_low == 0ull && | |
451 | (sspte.spte_high & high_mmio_mask) == high_mmio_mask) | |
452 | return true; | |
453 | ||
454 | return false; | |
455 | } | |
603e0651 XG |
456 | #endif |
457 | ||
8672b721 XG |
458 | static bool spte_has_volatile_bits(u64 spte) |
459 | { | |
460 | if (!shadow_accessed_mask) | |
461 | return false; | |
462 | ||
463 | if (!is_shadow_present_pte(spte)) | |
464 | return false; | |
465 | ||
4132779b XG |
466 | if ((spte & shadow_accessed_mask) && |
467 | (!is_writable_pte(spte) || (spte & shadow_dirty_mask))) | |
8672b721 XG |
468 | return false; |
469 | ||
470 | return true; | |
471 | } | |
472 | ||
4132779b XG |
473 | static bool spte_is_bit_cleared(u64 old_spte, u64 new_spte, u64 bit_mask) |
474 | { | |
475 | return (old_spte & bit_mask) && !(new_spte & bit_mask); | |
476 | } | |
477 | ||
1df9f2dc XG |
478 | /* Rules for using mmu_spte_set: |
479 | * Set the sptep from nonpresent to present. | |
480 | * Note: the sptep being assigned *must* be either not present | |
481 | * or in a state where the hardware will not attempt to update | |
482 | * the spte. | |
483 | */ | |
484 | static void mmu_spte_set(u64 *sptep, u64 new_spte) | |
485 | { | |
486 | WARN_ON(is_shadow_present_pte(*sptep)); | |
487 | __set_spte(sptep, new_spte); | |
488 | } | |
489 | ||
490 | /* Rules for using mmu_spte_update: | |
491 | * Update the state bits, it means the mapped pfn is not changged. | |
492 | */ | |
493 | static void mmu_spte_update(u64 *sptep, u64 new_spte) | |
b79b93f9 | 494 | { |
4132779b XG |
495 | u64 mask, old_spte = *sptep; |
496 | ||
497 | WARN_ON(!is_rmap_spte(new_spte)); | |
b79b93f9 | 498 | |
1df9f2dc XG |
499 | if (!is_shadow_present_pte(old_spte)) |
500 | return mmu_spte_set(sptep, new_spte); | |
501 | ||
4132779b XG |
502 | new_spte |= old_spte & shadow_dirty_mask; |
503 | ||
504 | mask = shadow_accessed_mask; | |
505 | if (is_writable_pte(old_spte)) | |
506 | mask |= shadow_dirty_mask; | |
507 | ||
508 | if (!spte_has_volatile_bits(old_spte) || (new_spte & mask) == mask) | |
603e0651 | 509 | __update_clear_spte_fast(sptep, new_spte); |
4132779b | 510 | else |
603e0651 | 511 | old_spte = __update_clear_spte_slow(sptep, new_spte); |
4132779b XG |
512 | |
513 | if (!shadow_accessed_mask) | |
514 | return; | |
515 | ||
516 | if (spte_is_bit_cleared(old_spte, new_spte, shadow_accessed_mask)) | |
517 | kvm_set_pfn_accessed(spte_to_pfn(old_spte)); | |
518 | if (spte_is_bit_cleared(old_spte, new_spte, shadow_dirty_mask)) | |
519 | kvm_set_pfn_dirty(spte_to_pfn(old_spte)); | |
b79b93f9 AK |
520 | } |
521 | ||
1df9f2dc XG |
522 | /* |
523 | * Rules for using mmu_spte_clear_track_bits: | |
524 | * It sets the sptep from present to nonpresent, and track the | |
525 | * state bits, it is used to clear the last level sptep. | |
526 | */ | |
527 | static int mmu_spte_clear_track_bits(u64 *sptep) | |
528 | { | |
529 | pfn_t pfn; | |
530 | u64 old_spte = *sptep; | |
531 | ||
532 | if (!spte_has_volatile_bits(old_spte)) | |
603e0651 | 533 | __update_clear_spte_fast(sptep, 0ull); |
1df9f2dc | 534 | else |
603e0651 | 535 | old_spte = __update_clear_spte_slow(sptep, 0ull); |
1df9f2dc XG |
536 | |
537 | if (!is_rmap_spte(old_spte)) | |
538 | return 0; | |
539 | ||
540 | pfn = spte_to_pfn(old_spte); | |
541 | if (!shadow_accessed_mask || old_spte & shadow_accessed_mask) | |
542 | kvm_set_pfn_accessed(pfn); | |
543 | if (!shadow_dirty_mask || (old_spte & shadow_dirty_mask)) | |
544 | kvm_set_pfn_dirty(pfn); | |
545 | return 1; | |
546 | } | |
547 | ||
548 | /* | |
549 | * Rules for using mmu_spte_clear_no_track: | |
550 | * Directly clear spte without caring the state bits of sptep, | |
551 | * it is used to set the upper level spte. | |
552 | */ | |
553 | static void mmu_spte_clear_no_track(u64 *sptep) | |
554 | { | |
603e0651 | 555 | __update_clear_spte_fast(sptep, 0ull); |
1df9f2dc XG |
556 | } |
557 | ||
c2a2ac2b XG |
558 | static u64 mmu_spte_get_lockless(u64 *sptep) |
559 | { | |
560 | return __get_spte_lockless(sptep); | |
561 | } | |
562 | ||
563 | static void walk_shadow_page_lockless_begin(struct kvm_vcpu *vcpu) | |
564 | { | |
565 | rcu_read_lock(); | |
566 | atomic_inc(&vcpu->kvm->arch.reader_counter); | |
567 | ||
568 | /* Increase the counter before walking shadow page table */ | |
569 | smp_mb__after_atomic_inc(); | |
570 | } | |
571 | ||
572 | static void walk_shadow_page_lockless_end(struct kvm_vcpu *vcpu) | |
573 | { | |
574 | /* Decrease the counter after walking shadow page table finished */ | |
575 | smp_mb__before_atomic_dec(); | |
576 | atomic_dec(&vcpu->kvm->arch.reader_counter); | |
577 | rcu_read_unlock(); | |
578 | } | |
579 | ||
e2dec939 | 580 | static int mmu_topup_memory_cache(struct kvm_mmu_memory_cache *cache, |
2e3e5882 | 581 | struct kmem_cache *base_cache, int min) |
714b93da AK |
582 | { |
583 | void *obj; | |
584 | ||
585 | if (cache->nobjs >= min) | |
e2dec939 | 586 | return 0; |
714b93da | 587 | while (cache->nobjs < ARRAY_SIZE(cache->objects)) { |
2e3e5882 | 588 | obj = kmem_cache_zalloc(base_cache, GFP_KERNEL); |
714b93da | 589 | if (!obj) |
e2dec939 | 590 | return -ENOMEM; |
714b93da AK |
591 | cache->objects[cache->nobjs++] = obj; |
592 | } | |
e2dec939 | 593 | return 0; |
714b93da AK |
594 | } |
595 | ||
f759e2b4 XG |
596 | static int mmu_memory_cache_free_objects(struct kvm_mmu_memory_cache *cache) |
597 | { | |
598 | return cache->nobjs; | |
599 | } | |
600 | ||
e8ad9a70 XG |
601 | static void mmu_free_memory_cache(struct kvm_mmu_memory_cache *mc, |
602 | struct kmem_cache *cache) | |
714b93da AK |
603 | { |
604 | while (mc->nobjs) | |
e8ad9a70 | 605 | kmem_cache_free(cache, mc->objects[--mc->nobjs]); |
714b93da AK |
606 | } |
607 | ||
c1158e63 | 608 | static int mmu_topup_memory_cache_page(struct kvm_mmu_memory_cache *cache, |
2e3e5882 | 609 | int min) |
c1158e63 | 610 | { |
842f22ed | 611 | void *page; |
c1158e63 AK |
612 | |
613 | if (cache->nobjs >= min) | |
614 | return 0; | |
615 | while (cache->nobjs < ARRAY_SIZE(cache->objects)) { | |
842f22ed | 616 | page = (void *)__get_free_page(GFP_KERNEL); |
c1158e63 AK |
617 | if (!page) |
618 | return -ENOMEM; | |
842f22ed | 619 | cache->objects[cache->nobjs++] = page; |
c1158e63 AK |
620 | } |
621 | return 0; | |
622 | } | |
623 | ||
624 | static void mmu_free_memory_cache_page(struct kvm_mmu_memory_cache *mc) | |
625 | { | |
626 | while (mc->nobjs) | |
c4d198d5 | 627 | free_page((unsigned long)mc->objects[--mc->nobjs]); |
c1158e63 AK |
628 | } |
629 | ||
2e3e5882 | 630 | static int mmu_topup_memory_caches(struct kvm_vcpu *vcpu) |
714b93da | 631 | { |
e2dec939 AK |
632 | int r; |
633 | ||
53c07b18 | 634 | r = mmu_topup_memory_cache(&vcpu->arch.mmu_pte_list_desc_cache, |
67052b35 | 635 | pte_list_desc_cache, 8 + PTE_PREFETCH_NUM); |
d3d25b04 AK |
636 | if (r) |
637 | goto out; | |
ad312c7c | 638 | r = mmu_topup_memory_cache_page(&vcpu->arch.mmu_page_cache, 8); |
d3d25b04 AK |
639 | if (r) |
640 | goto out; | |
ad312c7c | 641 | r = mmu_topup_memory_cache(&vcpu->arch.mmu_page_header_cache, |
2e3e5882 | 642 | mmu_page_header_cache, 4); |
e2dec939 AK |
643 | out: |
644 | return r; | |
714b93da AK |
645 | } |
646 | ||
647 | static void mmu_free_memory_caches(struct kvm_vcpu *vcpu) | |
648 | { | |
53c07b18 XG |
649 | mmu_free_memory_cache(&vcpu->arch.mmu_pte_list_desc_cache, |
650 | pte_list_desc_cache); | |
ad312c7c | 651 | mmu_free_memory_cache_page(&vcpu->arch.mmu_page_cache); |
e8ad9a70 XG |
652 | mmu_free_memory_cache(&vcpu->arch.mmu_page_header_cache, |
653 | mmu_page_header_cache); | |
714b93da AK |
654 | } |
655 | ||
656 | static void *mmu_memory_cache_alloc(struct kvm_mmu_memory_cache *mc, | |
657 | size_t size) | |
658 | { | |
659 | void *p; | |
660 | ||
661 | BUG_ON(!mc->nobjs); | |
662 | p = mc->objects[--mc->nobjs]; | |
714b93da AK |
663 | return p; |
664 | } | |
665 | ||
53c07b18 | 666 | static struct pte_list_desc *mmu_alloc_pte_list_desc(struct kvm_vcpu *vcpu) |
714b93da | 667 | { |
53c07b18 XG |
668 | return mmu_memory_cache_alloc(&vcpu->arch.mmu_pte_list_desc_cache, |
669 | sizeof(struct pte_list_desc)); | |
714b93da AK |
670 | } |
671 | ||
53c07b18 | 672 | static void mmu_free_pte_list_desc(struct pte_list_desc *pte_list_desc) |
714b93da | 673 | { |
53c07b18 | 674 | kmem_cache_free(pte_list_desc_cache, pte_list_desc); |
714b93da AK |
675 | } |
676 | ||
2032a93d LJ |
677 | static gfn_t kvm_mmu_page_get_gfn(struct kvm_mmu_page *sp, int index) |
678 | { | |
679 | if (!sp->role.direct) | |
680 | return sp->gfns[index]; | |
681 | ||
682 | return sp->gfn + (index << ((sp->role.level - 1) * PT64_LEVEL_BITS)); | |
683 | } | |
684 | ||
685 | static void kvm_mmu_page_set_gfn(struct kvm_mmu_page *sp, int index, gfn_t gfn) | |
686 | { | |
687 | if (sp->role.direct) | |
688 | BUG_ON(gfn != kvm_mmu_page_get_gfn(sp, index)); | |
689 | else | |
690 | sp->gfns[index] = gfn; | |
691 | } | |
692 | ||
05da4558 | 693 | /* |
d4dbf470 TY |
694 | * Return the pointer to the large page information for a given gfn, |
695 | * handling slots that are not large page aligned. | |
05da4558 | 696 | */ |
d4dbf470 TY |
697 | static struct kvm_lpage_info *lpage_info_slot(gfn_t gfn, |
698 | struct kvm_memory_slot *slot, | |
699 | int level) | |
05da4558 MT |
700 | { |
701 | unsigned long idx; | |
702 | ||
82855413 JR |
703 | idx = (gfn >> KVM_HPAGE_GFN_SHIFT(level)) - |
704 | (slot->base_gfn >> KVM_HPAGE_GFN_SHIFT(level)); | |
d4dbf470 | 705 | return &slot->lpage_info[level - 2][idx]; |
05da4558 MT |
706 | } |
707 | ||
708 | static void account_shadowed(struct kvm *kvm, gfn_t gfn) | |
709 | { | |
d25797b2 | 710 | struct kvm_memory_slot *slot; |
d4dbf470 | 711 | struct kvm_lpage_info *linfo; |
d25797b2 | 712 | int i; |
05da4558 | 713 | |
a1f4d395 | 714 | slot = gfn_to_memslot(kvm, gfn); |
d25797b2 JR |
715 | for (i = PT_DIRECTORY_LEVEL; |
716 | i < PT_PAGE_TABLE_LEVEL + KVM_NR_PAGE_SIZES; ++i) { | |
d4dbf470 TY |
717 | linfo = lpage_info_slot(gfn, slot, i); |
718 | linfo->write_count += 1; | |
d25797b2 | 719 | } |
332b207d | 720 | kvm->arch.indirect_shadow_pages++; |
05da4558 MT |
721 | } |
722 | ||
723 | static void unaccount_shadowed(struct kvm *kvm, gfn_t gfn) | |
724 | { | |
d25797b2 | 725 | struct kvm_memory_slot *slot; |
d4dbf470 | 726 | struct kvm_lpage_info *linfo; |
d25797b2 | 727 | int i; |
05da4558 | 728 | |
a1f4d395 | 729 | slot = gfn_to_memslot(kvm, gfn); |
d25797b2 JR |
730 | for (i = PT_DIRECTORY_LEVEL; |
731 | i < PT_PAGE_TABLE_LEVEL + KVM_NR_PAGE_SIZES; ++i) { | |
d4dbf470 TY |
732 | linfo = lpage_info_slot(gfn, slot, i); |
733 | linfo->write_count -= 1; | |
734 | WARN_ON(linfo->write_count < 0); | |
d25797b2 | 735 | } |
332b207d | 736 | kvm->arch.indirect_shadow_pages--; |
05da4558 MT |
737 | } |
738 | ||
d25797b2 JR |
739 | static int has_wrprotected_page(struct kvm *kvm, |
740 | gfn_t gfn, | |
741 | int level) | |
05da4558 | 742 | { |
2843099f | 743 | struct kvm_memory_slot *slot; |
d4dbf470 | 744 | struct kvm_lpage_info *linfo; |
05da4558 | 745 | |
a1f4d395 | 746 | slot = gfn_to_memslot(kvm, gfn); |
05da4558 | 747 | if (slot) { |
d4dbf470 TY |
748 | linfo = lpage_info_slot(gfn, slot, level); |
749 | return linfo->write_count; | |
05da4558 MT |
750 | } |
751 | ||
752 | return 1; | |
753 | } | |
754 | ||
d25797b2 | 755 | static int host_mapping_level(struct kvm *kvm, gfn_t gfn) |
05da4558 | 756 | { |
8f0b1ab6 | 757 | unsigned long page_size; |
d25797b2 | 758 | int i, ret = 0; |
05da4558 | 759 | |
8f0b1ab6 | 760 | page_size = kvm_host_page_size(kvm, gfn); |
05da4558 | 761 | |
d25797b2 JR |
762 | for (i = PT_PAGE_TABLE_LEVEL; |
763 | i < (PT_PAGE_TABLE_LEVEL + KVM_NR_PAGE_SIZES); ++i) { | |
764 | if (page_size >= KVM_HPAGE_SIZE(i)) | |
765 | ret = i; | |
766 | else | |
767 | break; | |
768 | } | |
769 | ||
4c2155ce | 770 | return ret; |
05da4558 MT |
771 | } |
772 | ||
5d163b1c XG |
773 | static struct kvm_memory_slot * |
774 | gfn_to_memslot_dirty_bitmap(struct kvm_vcpu *vcpu, gfn_t gfn, | |
775 | bool no_dirty_log) | |
05da4558 MT |
776 | { |
777 | struct kvm_memory_slot *slot; | |
5d163b1c XG |
778 | |
779 | slot = gfn_to_memslot(vcpu->kvm, gfn); | |
780 | if (!slot || slot->flags & KVM_MEMSLOT_INVALID || | |
781 | (no_dirty_log && slot->dirty_bitmap)) | |
782 | slot = NULL; | |
783 | ||
784 | return slot; | |
785 | } | |
786 | ||
787 | static bool mapping_level_dirty_bitmap(struct kvm_vcpu *vcpu, gfn_t large_gfn) | |
788 | { | |
a0a8eaba | 789 | return !gfn_to_memslot_dirty_bitmap(vcpu, large_gfn, true); |
936a5fe6 AA |
790 | } |
791 | ||
792 | static int mapping_level(struct kvm_vcpu *vcpu, gfn_t large_gfn) | |
793 | { | |
794 | int host_level, level, max_level; | |
05da4558 | 795 | |
d25797b2 JR |
796 | host_level = host_mapping_level(vcpu->kvm, large_gfn); |
797 | ||
798 | if (host_level == PT_PAGE_TABLE_LEVEL) | |
799 | return host_level; | |
800 | ||
878403b7 SY |
801 | max_level = kvm_x86_ops->get_lpage_level() < host_level ? |
802 | kvm_x86_ops->get_lpage_level() : host_level; | |
803 | ||
804 | for (level = PT_DIRECTORY_LEVEL; level <= max_level; ++level) | |
d25797b2 JR |
805 | if (has_wrprotected_page(vcpu->kvm, large_gfn, level)) |
806 | break; | |
d25797b2 JR |
807 | |
808 | return level - 1; | |
05da4558 MT |
809 | } |
810 | ||
290fc38d | 811 | /* |
53c07b18 | 812 | * Pte mapping structures: |
cd4a4e53 | 813 | * |
53c07b18 | 814 | * If pte_list bit zero is zero, then pte_list point to the spte. |
cd4a4e53 | 815 | * |
53c07b18 XG |
816 | * If pte_list bit zero is one, (then pte_list & ~1) points to a struct |
817 | * pte_list_desc containing more mappings. | |
53a27b39 | 818 | * |
53c07b18 | 819 | * Returns the number of pte entries before the spte was added or zero if |
53a27b39 MT |
820 | * the spte was not added. |
821 | * | |
cd4a4e53 | 822 | */ |
53c07b18 XG |
823 | static int pte_list_add(struct kvm_vcpu *vcpu, u64 *spte, |
824 | unsigned long *pte_list) | |
cd4a4e53 | 825 | { |
53c07b18 | 826 | struct pte_list_desc *desc; |
53a27b39 | 827 | int i, count = 0; |
cd4a4e53 | 828 | |
53c07b18 XG |
829 | if (!*pte_list) { |
830 | rmap_printk("pte_list_add: %p %llx 0->1\n", spte, *spte); | |
831 | *pte_list = (unsigned long)spte; | |
832 | } else if (!(*pte_list & 1)) { | |
833 | rmap_printk("pte_list_add: %p %llx 1->many\n", spte, *spte); | |
834 | desc = mmu_alloc_pte_list_desc(vcpu); | |
835 | desc->sptes[0] = (u64 *)*pte_list; | |
d555c333 | 836 | desc->sptes[1] = spte; |
53c07b18 | 837 | *pte_list = (unsigned long)desc | 1; |
cb16a7b3 | 838 | ++count; |
cd4a4e53 | 839 | } else { |
53c07b18 XG |
840 | rmap_printk("pte_list_add: %p %llx many->many\n", spte, *spte); |
841 | desc = (struct pte_list_desc *)(*pte_list & ~1ul); | |
842 | while (desc->sptes[PTE_LIST_EXT-1] && desc->more) { | |
cd4a4e53 | 843 | desc = desc->more; |
53c07b18 | 844 | count += PTE_LIST_EXT; |
53a27b39 | 845 | } |
53c07b18 XG |
846 | if (desc->sptes[PTE_LIST_EXT-1]) { |
847 | desc->more = mmu_alloc_pte_list_desc(vcpu); | |
cd4a4e53 AK |
848 | desc = desc->more; |
849 | } | |
d555c333 | 850 | for (i = 0; desc->sptes[i]; ++i) |
cb16a7b3 | 851 | ++count; |
d555c333 | 852 | desc->sptes[i] = spte; |
cd4a4e53 | 853 | } |
53a27b39 | 854 | return count; |
cd4a4e53 AK |
855 | } |
856 | ||
53c07b18 XG |
857 | static u64 *pte_list_next(unsigned long *pte_list, u64 *spte) |
858 | { | |
859 | struct pte_list_desc *desc; | |
860 | u64 *prev_spte; | |
861 | int i; | |
862 | ||
863 | if (!*pte_list) | |
864 | return NULL; | |
865 | else if (!(*pte_list & 1)) { | |
866 | if (!spte) | |
867 | return (u64 *)*pte_list; | |
868 | return NULL; | |
869 | } | |
870 | desc = (struct pte_list_desc *)(*pte_list & ~1ul); | |
871 | prev_spte = NULL; | |
872 | while (desc) { | |
873 | for (i = 0; i < PTE_LIST_EXT && desc->sptes[i]; ++i) { | |
874 | if (prev_spte == spte) | |
875 | return desc->sptes[i]; | |
876 | prev_spte = desc->sptes[i]; | |
877 | } | |
878 | desc = desc->more; | |
879 | } | |
880 | return NULL; | |
881 | } | |
882 | ||
883 | static void | |
884 | pte_list_desc_remove_entry(unsigned long *pte_list, struct pte_list_desc *desc, | |
885 | int i, struct pte_list_desc *prev_desc) | |
cd4a4e53 AK |
886 | { |
887 | int j; | |
888 | ||
53c07b18 | 889 | for (j = PTE_LIST_EXT - 1; !desc->sptes[j] && j > i; --j) |
cd4a4e53 | 890 | ; |
d555c333 AK |
891 | desc->sptes[i] = desc->sptes[j]; |
892 | desc->sptes[j] = NULL; | |
cd4a4e53 AK |
893 | if (j != 0) |
894 | return; | |
895 | if (!prev_desc && !desc->more) | |
53c07b18 | 896 | *pte_list = (unsigned long)desc->sptes[0]; |
cd4a4e53 AK |
897 | else |
898 | if (prev_desc) | |
899 | prev_desc->more = desc->more; | |
900 | else | |
53c07b18 XG |
901 | *pte_list = (unsigned long)desc->more | 1; |
902 | mmu_free_pte_list_desc(desc); | |
cd4a4e53 AK |
903 | } |
904 | ||
53c07b18 | 905 | static void pte_list_remove(u64 *spte, unsigned long *pte_list) |
cd4a4e53 | 906 | { |
53c07b18 XG |
907 | struct pte_list_desc *desc; |
908 | struct pte_list_desc *prev_desc; | |
cd4a4e53 AK |
909 | int i; |
910 | ||
53c07b18 XG |
911 | if (!*pte_list) { |
912 | printk(KERN_ERR "pte_list_remove: %p 0->BUG\n", spte); | |
cd4a4e53 | 913 | BUG(); |
53c07b18 XG |
914 | } else if (!(*pte_list & 1)) { |
915 | rmap_printk("pte_list_remove: %p 1->0\n", spte); | |
916 | if ((u64 *)*pte_list != spte) { | |
917 | printk(KERN_ERR "pte_list_remove: %p 1->BUG\n", spte); | |
cd4a4e53 AK |
918 | BUG(); |
919 | } | |
53c07b18 | 920 | *pte_list = 0; |
cd4a4e53 | 921 | } else { |
53c07b18 XG |
922 | rmap_printk("pte_list_remove: %p many->many\n", spte); |
923 | desc = (struct pte_list_desc *)(*pte_list & ~1ul); | |
cd4a4e53 AK |
924 | prev_desc = NULL; |
925 | while (desc) { | |
53c07b18 | 926 | for (i = 0; i < PTE_LIST_EXT && desc->sptes[i]; ++i) |
d555c333 | 927 | if (desc->sptes[i] == spte) { |
53c07b18 | 928 | pte_list_desc_remove_entry(pte_list, |
714b93da | 929 | desc, i, |
cd4a4e53 AK |
930 | prev_desc); |
931 | return; | |
932 | } | |
933 | prev_desc = desc; | |
934 | desc = desc->more; | |
935 | } | |
53c07b18 | 936 | pr_err("pte_list_remove: %p many->many\n", spte); |
cd4a4e53 AK |
937 | BUG(); |
938 | } | |
939 | } | |
940 | ||
67052b35 XG |
941 | typedef void (*pte_list_walk_fn) (u64 *spte); |
942 | static void pte_list_walk(unsigned long *pte_list, pte_list_walk_fn fn) | |
943 | { | |
944 | struct pte_list_desc *desc; | |
945 | int i; | |
946 | ||
947 | if (!*pte_list) | |
948 | return; | |
949 | ||
950 | if (!(*pte_list & 1)) | |
951 | return fn((u64 *)*pte_list); | |
952 | ||
953 | desc = (struct pte_list_desc *)(*pte_list & ~1ul); | |
954 | while (desc) { | |
955 | for (i = 0; i < PTE_LIST_EXT && desc->sptes[i]; ++i) | |
956 | fn(desc->sptes[i]); | |
957 | desc = desc->more; | |
958 | } | |
959 | } | |
960 | ||
9b9b1492 TY |
961 | static unsigned long *__gfn_to_rmap(struct kvm *kvm, gfn_t gfn, int level, |
962 | struct kvm_memory_slot *slot) | |
53c07b18 | 963 | { |
53c07b18 XG |
964 | struct kvm_lpage_info *linfo; |
965 | ||
53c07b18 XG |
966 | if (likely(level == PT_PAGE_TABLE_LEVEL)) |
967 | return &slot->rmap[gfn - slot->base_gfn]; | |
968 | ||
969 | linfo = lpage_info_slot(gfn, slot, level); | |
53c07b18 XG |
970 | return &linfo->rmap_pde; |
971 | } | |
972 | ||
9b9b1492 TY |
973 | /* |
974 | * Take gfn and return the reverse mapping to it. | |
975 | */ | |
976 | static unsigned long *gfn_to_rmap(struct kvm *kvm, gfn_t gfn, int level) | |
977 | { | |
978 | struct kvm_memory_slot *slot; | |
979 | ||
980 | slot = gfn_to_memslot(kvm, gfn); | |
981 | return __gfn_to_rmap(kvm, gfn, level, slot); | |
982 | } | |
983 | ||
f759e2b4 XG |
984 | static bool rmap_can_add(struct kvm_vcpu *vcpu) |
985 | { | |
986 | struct kvm_mmu_memory_cache *cache; | |
987 | ||
988 | cache = &vcpu->arch.mmu_pte_list_desc_cache; | |
989 | return mmu_memory_cache_free_objects(cache); | |
990 | } | |
991 | ||
53c07b18 XG |
992 | static int rmap_add(struct kvm_vcpu *vcpu, u64 *spte, gfn_t gfn) |
993 | { | |
994 | struct kvm_mmu_page *sp; | |
995 | unsigned long *rmapp; | |
996 | ||
53c07b18 XG |
997 | sp = page_header(__pa(spte)); |
998 | kvm_mmu_page_set_gfn(sp, spte - sp->spt, gfn); | |
999 | rmapp = gfn_to_rmap(vcpu->kvm, gfn, sp->role.level); | |
1000 | return pte_list_add(vcpu, spte, rmapp); | |
1001 | } | |
1002 | ||
1003 | static u64 *rmap_next(struct kvm *kvm, unsigned long *rmapp, u64 *spte) | |
1004 | { | |
1005 | return pte_list_next(rmapp, spte); | |
1006 | } | |
1007 | ||
1008 | static void rmap_remove(struct kvm *kvm, u64 *spte) | |
1009 | { | |
1010 | struct kvm_mmu_page *sp; | |
1011 | gfn_t gfn; | |
1012 | unsigned long *rmapp; | |
1013 | ||
1014 | sp = page_header(__pa(spte)); | |
1015 | gfn = kvm_mmu_page_get_gfn(sp, spte - sp->spt); | |
1016 | rmapp = gfn_to_rmap(kvm, gfn, sp->role.level); | |
1017 | pte_list_remove(spte, rmapp); | |
1018 | } | |
1019 | ||
c3707958 | 1020 | static void drop_spte(struct kvm *kvm, u64 *sptep) |
e4b502ea | 1021 | { |
1df9f2dc | 1022 | if (mmu_spte_clear_track_bits(sptep)) |
eb45fda4 | 1023 | rmap_remove(kvm, sptep); |
be38d276 AK |
1024 | } |
1025 | ||
95d4c16c TY |
1026 | int kvm_mmu_rmap_write_protect(struct kvm *kvm, u64 gfn, |
1027 | struct kvm_memory_slot *slot) | |
98348e95 | 1028 | { |
290fc38d | 1029 | unsigned long *rmapp; |
374cbac0 | 1030 | u64 *spte; |
44ad9944 | 1031 | int i, write_protected = 0; |
374cbac0 | 1032 | |
9b9b1492 | 1033 | rmapp = __gfn_to_rmap(kvm, gfn, PT_PAGE_TABLE_LEVEL, slot); |
98348e95 IE |
1034 | spte = rmap_next(kvm, rmapp, NULL); |
1035 | while (spte) { | |
374cbac0 | 1036 | BUG_ON(!(*spte & PT_PRESENT_MASK)); |
374cbac0 | 1037 | rmap_printk("rmap_write_protect: spte %p %llx\n", spte, *spte); |
8dae4445 | 1038 | if (is_writable_pte(*spte)) { |
1df9f2dc | 1039 | mmu_spte_update(spte, *spte & ~PT_WRITABLE_MASK); |
caa5b8a5 ED |
1040 | write_protected = 1; |
1041 | } | |
9647c14c | 1042 | spte = rmap_next(kvm, rmapp, spte); |
374cbac0 | 1043 | } |
855149aa | 1044 | |
05da4558 | 1045 | /* check for huge page mappings */ |
44ad9944 JR |
1046 | for (i = PT_DIRECTORY_LEVEL; |
1047 | i < PT_PAGE_TABLE_LEVEL + KVM_NR_PAGE_SIZES; ++i) { | |
9b9b1492 | 1048 | rmapp = __gfn_to_rmap(kvm, gfn, i, slot); |
44ad9944 JR |
1049 | spte = rmap_next(kvm, rmapp, NULL); |
1050 | while (spte) { | |
44ad9944 | 1051 | BUG_ON(!(*spte & PT_PRESENT_MASK)); |
d6eebf8b | 1052 | BUG_ON(!is_large_pte(*spte)); |
44ad9944 | 1053 | pgprintk("rmap_write_protect(large): spte %p %llx %lld\n", spte, *spte, gfn); |
8dae4445 | 1054 | if (is_writable_pte(*spte)) { |
c3707958 | 1055 | drop_spte(kvm, spte); |
44ad9944 | 1056 | --kvm->stat.lpages; |
44ad9944 JR |
1057 | spte = NULL; |
1058 | write_protected = 1; | |
1059 | } | |
1060 | spte = rmap_next(kvm, rmapp, spte); | |
05da4558 | 1061 | } |
05da4558 MT |
1062 | } |
1063 | ||
b1a36821 | 1064 | return write_protected; |
374cbac0 AK |
1065 | } |
1066 | ||
95d4c16c TY |
1067 | static int rmap_write_protect(struct kvm *kvm, u64 gfn) |
1068 | { | |
1069 | struct kvm_memory_slot *slot; | |
1070 | ||
1071 | slot = gfn_to_memslot(kvm, gfn); | |
1072 | return kvm_mmu_rmap_write_protect(kvm, gfn, slot); | |
1073 | } | |
1074 | ||
8a8365c5 FD |
1075 | static int kvm_unmap_rmapp(struct kvm *kvm, unsigned long *rmapp, |
1076 | unsigned long data) | |
e930bffe AA |
1077 | { |
1078 | u64 *spte; | |
1079 | int need_tlb_flush = 0; | |
1080 | ||
1081 | while ((spte = rmap_next(kvm, rmapp, NULL))) { | |
1082 | BUG_ON(!(*spte & PT_PRESENT_MASK)); | |
1083 | rmap_printk("kvm_rmap_unmap_hva: spte %p %llx\n", spte, *spte); | |
c3707958 | 1084 | drop_spte(kvm, spte); |
e930bffe AA |
1085 | need_tlb_flush = 1; |
1086 | } | |
1087 | return need_tlb_flush; | |
1088 | } | |
1089 | ||
8a8365c5 FD |
1090 | static int kvm_set_pte_rmapp(struct kvm *kvm, unsigned long *rmapp, |
1091 | unsigned long data) | |
3da0dd43 IE |
1092 | { |
1093 | int need_flush = 0; | |
e4b502ea | 1094 | u64 *spte, new_spte; |
3da0dd43 IE |
1095 | pte_t *ptep = (pte_t *)data; |
1096 | pfn_t new_pfn; | |
1097 | ||
1098 | WARN_ON(pte_huge(*ptep)); | |
1099 | new_pfn = pte_pfn(*ptep); | |
1100 | spte = rmap_next(kvm, rmapp, NULL); | |
1101 | while (spte) { | |
1102 | BUG_ON(!is_shadow_present_pte(*spte)); | |
1103 | rmap_printk("kvm_set_pte_rmapp: spte %p %llx\n", spte, *spte); | |
1104 | need_flush = 1; | |
1105 | if (pte_write(*ptep)) { | |
c3707958 | 1106 | drop_spte(kvm, spte); |
3da0dd43 IE |
1107 | spte = rmap_next(kvm, rmapp, NULL); |
1108 | } else { | |
1109 | new_spte = *spte &~ (PT64_BASE_ADDR_MASK); | |
1110 | new_spte |= (u64)new_pfn << PAGE_SHIFT; | |
1111 | ||
1112 | new_spte &= ~PT_WRITABLE_MASK; | |
1113 | new_spte &= ~SPTE_HOST_WRITEABLE; | |
b79b93f9 | 1114 | new_spte &= ~shadow_accessed_mask; |
1df9f2dc XG |
1115 | mmu_spte_clear_track_bits(spte); |
1116 | mmu_spte_set(spte, new_spte); | |
3da0dd43 IE |
1117 | spte = rmap_next(kvm, rmapp, spte); |
1118 | } | |
1119 | } | |
1120 | if (need_flush) | |
1121 | kvm_flush_remote_tlbs(kvm); | |
1122 | ||
1123 | return 0; | |
1124 | } | |
1125 | ||
8a8365c5 FD |
1126 | static int kvm_handle_hva(struct kvm *kvm, unsigned long hva, |
1127 | unsigned long data, | |
3da0dd43 | 1128 | int (*handler)(struct kvm *kvm, unsigned long *rmapp, |
8a8365c5 | 1129 | unsigned long data)) |
e930bffe | 1130 | { |
852e3c19 | 1131 | int i, j; |
90bb6fc5 | 1132 | int ret; |
e930bffe | 1133 | int retval = 0; |
bc6678a3 MT |
1134 | struct kvm_memslots *slots; |
1135 | ||
90d83dc3 | 1136 | slots = kvm_memslots(kvm); |
e930bffe | 1137 | |
46a26bf5 MT |
1138 | for (i = 0; i < slots->nmemslots; i++) { |
1139 | struct kvm_memory_slot *memslot = &slots->memslots[i]; | |
e930bffe AA |
1140 | unsigned long start = memslot->userspace_addr; |
1141 | unsigned long end; | |
1142 | ||
e930bffe AA |
1143 | end = start + (memslot->npages << PAGE_SHIFT); |
1144 | if (hva >= start && hva < end) { | |
1145 | gfn_t gfn_offset = (hva - start) >> PAGE_SHIFT; | |
d4dbf470 | 1146 | gfn_t gfn = memslot->base_gfn + gfn_offset; |
852e3c19 | 1147 | |
90bb6fc5 | 1148 | ret = handler(kvm, &memslot->rmap[gfn_offset], data); |
852e3c19 JR |
1149 | |
1150 | for (j = 0; j < KVM_NR_PAGE_SIZES - 1; ++j) { | |
d4dbf470 TY |
1151 | struct kvm_lpage_info *linfo; |
1152 | ||
1153 | linfo = lpage_info_slot(gfn, memslot, | |
1154 | PT_DIRECTORY_LEVEL + j); | |
1155 | ret |= handler(kvm, &linfo->rmap_pde, data); | |
852e3c19 | 1156 | } |
90bb6fc5 AK |
1157 | trace_kvm_age_page(hva, memslot, ret); |
1158 | retval |= ret; | |
e930bffe AA |
1159 | } |
1160 | } | |
1161 | ||
1162 | return retval; | |
1163 | } | |
1164 | ||
1165 | int kvm_unmap_hva(struct kvm *kvm, unsigned long hva) | |
1166 | { | |
3da0dd43 IE |
1167 | return kvm_handle_hva(kvm, hva, 0, kvm_unmap_rmapp); |
1168 | } | |
1169 | ||
1170 | void kvm_set_spte_hva(struct kvm *kvm, unsigned long hva, pte_t pte) | |
1171 | { | |
8a8365c5 | 1172 | kvm_handle_hva(kvm, hva, (unsigned long)&pte, kvm_set_pte_rmapp); |
e930bffe AA |
1173 | } |
1174 | ||
8a8365c5 FD |
1175 | static int kvm_age_rmapp(struct kvm *kvm, unsigned long *rmapp, |
1176 | unsigned long data) | |
e930bffe AA |
1177 | { |
1178 | u64 *spte; | |
1179 | int young = 0; | |
1180 | ||
6316e1c8 RR |
1181 | /* |
1182 | * Emulate the accessed bit for EPT, by checking if this page has | |
1183 | * an EPT mapping, and clearing it if it does. On the next access, | |
1184 | * a new EPT mapping will be established. | |
1185 | * This has some overhead, but not as much as the cost of swapping | |
1186 | * out actively used pages or breaking up actively used hugepages. | |
1187 | */ | |
534e38b4 | 1188 | if (!shadow_accessed_mask) |
6316e1c8 | 1189 | return kvm_unmap_rmapp(kvm, rmapp, data); |
534e38b4 | 1190 | |
e930bffe AA |
1191 | spte = rmap_next(kvm, rmapp, NULL); |
1192 | while (spte) { | |
1193 | int _young; | |
1194 | u64 _spte = *spte; | |
1195 | BUG_ON(!(_spte & PT_PRESENT_MASK)); | |
1196 | _young = _spte & PT_ACCESSED_MASK; | |
1197 | if (_young) { | |
1198 | young = 1; | |
1199 | clear_bit(PT_ACCESSED_SHIFT, (unsigned long *)spte); | |
1200 | } | |
1201 | spte = rmap_next(kvm, rmapp, spte); | |
1202 | } | |
1203 | return young; | |
1204 | } | |
1205 | ||
8ee53820 AA |
1206 | static int kvm_test_age_rmapp(struct kvm *kvm, unsigned long *rmapp, |
1207 | unsigned long data) | |
1208 | { | |
1209 | u64 *spte; | |
1210 | int young = 0; | |
1211 | ||
1212 | /* | |
1213 | * If there's no access bit in the secondary pte set by the | |
1214 | * hardware it's up to gup-fast/gup to set the access bit in | |
1215 | * the primary pte or in the page structure. | |
1216 | */ | |
1217 | if (!shadow_accessed_mask) | |
1218 | goto out; | |
1219 | ||
1220 | spte = rmap_next(kvm, rmapp, NULL); | |
1221 | while (spte) { | |
1222 | u64 _spte = *spte; | |
1223 | BUG_ON(!(_spte & PT_PRESENT_MASK)); | |
1224 | young = _spte & PT_ACCESSED_MASK; | |
1225 | if (young) { | |
1226 | young = 1; | |
1227 | break; | |
1228 | } | |
1229 | spte = rmap_next(kvm, rmapp, spte); | |
1230 | } | |
1231 | out: | |
1232 | return young; | |
1233 | } | |
1234 | ||
53a27b39 MT |
1235 | #define RMAP_RECYCLE_THRESHOLD 1000 |
1236 | ||
852e3c19 | 1237 | static void rmap_recycle(struct kvm_vcpu *vcpu, u64 *spte, gfn_t gfn) |
53a27b39 MT |
1238 | { |
1239 | unsigned long *rmapp; | |
852e3c19 JR |
1240 | struct kvm_mmu_page *sp; |
1241 | ||
1242 | sp = page_header(__pa(spte)); | |
53a27b39 | 1243 | |
852e3c19 | 1244 | rmapp = gfn_to_rmap(vcpu->kvm, gfn, sp->role.level); |
53a27b39 | 1245 | |
3da0dd43 | 1246 | kvm_unmap_rmapp(vcpu->kvm, rmapp, 0); |
53a27b39 MT |
1247 | kvm_flush_remote_tlbs(vcpu->kvm); |
1248 | } | |
1249 | ||
e930bffe AA |
1250 | int kvm_age_hva(struct kvm *kvm, unsigned long hva) |
1251 | { | |
3da0dd43 | 1252 | return kvm_handle_hva(kvm, hva, 0, kvm_age_rmapp); |
e930bffe AA |
1253 | } |
1254 | ||
8ee53820 AA |
1255 | int kvm_test_age_hva(struct kvm *kvm, unsigned long hva) |
1256 | { | |
1257 | return kvm_handle_hva(kvm, hva, 0, kvm_test_age_rmapp); | |
1258 | } | |
1259 | ||
d6c69ee9 | 1260 | #ifdef MMU_DEBUG |
47ad8e68 | 1261 | static int is_empty_shadow_page(u64 *spt) |
6aa8b732 | 1262 | { |
139bdb2d AK |
1263 | u64 *pos; |
1264 | u64 *end; | |
1265 | ||
47ad8e68 | 1266 | for (pos = spt, end = pos + PAGE_SIZE / sizeof(u64); pos != end; pos++) |
3c915510 | 1267 | if (is_shadow_present_pte(*pos)) { |
b8688d51 | 1268 | printk(KERN_ERR "%s: %p %llx\n", __func__, |
139bdb2d | 1269 | pos, *pos); |
6aa8b732 | 1270 | return 0; |
139bdb2d | 1271 | } |
6aa8b732 AK |
1272 | return 1; |
1273 | } | |
d6c69ee9 | 1274 | #endif |
6aa8b732 | 1275 | |
45221ab6 DH |
1276 | /* |
1277 | * This value is the sum of all of the kvm instances's | |
1278 | * kvm->arch.n_used_mmu_pages values. We need a global, | |
1279 | * aggregate version in order to make the slab shrinker | |
1280 | * faster | |
1281 | */ | |
1282 | static inline void kvm_mod_used_mmu_pages(struct kvm *kvm, int nr) | |
1283 | { | |
1284 | kvm->arch.n_used_mmu_pages += nr; | |
1285 | percpu_counter_add(&kvm_total_used_mmu_pages, nr); | |
1286 | } | |
1287 | ||
bd4c86ea XG |
1288 | /* |
1289 | * Remove the sp from shadow page cache, after call it, | |
1290 | * we can not find this sp from the cache, and the shadow | |
1291 | * page table is still valid. | |
1292 | * It should be under the protection of mmu lock. | |
1293 | */ | |
1294 | static void kvm_mmu_isolate_page(struct kvm_mmu_page *sp) | |
260746c0 | 1295 | { |
4db35314 | 1296 | ASSERT(is_empty_shadow_page(sp->spt)); |
7775834a | 1297 | hlist_del(&sp->hash_link); |
2032a93d | 1298 | if (!sp->role.direct) |
842f22ed | 1299 | free_page((unsigned long)sp->gfns); |
bd4c86ea XG |
1300 | } |
1301 | ||
1302 | /* | |
1303 | * Free the shadow page table and the sp, we can do it | |
1304 | * out of the protection of mmu lock. | |
1305 | */ | |
1306 | static void kvm_mmu_free_page(struct kvm_mmu_page *sp) | |
1307 | { | |
1308 | list_del(&sp->link); | |
1309 | free_page((unsigned long)sp->spt); | |
e8ad9a70 | 1310 | kmem_cache_free(mmu_page_header_cache, sp); |
260746c0 AK |
1311 | } |
1312 | ||
cea0f0e7 AK |
1313 | static unsigned kvm_page_table_hashfn(gfn_t gfn) |
1314 | { | |
1ae0a13d | 1315 | return gfn & ((1 << KVM_MMU_HASH_SHIFT) - 1); |
cea0f0e7 AK |
1316 | } |
1317 | ||
714b93da | 1318 | static void mmu_page_add_parent_pte(struct kvm_vcpu *vcpu, |
4db35314 | 1319 | struct kvm_mmu_page *sp, u64 *parent_pte) |
cea0f0e7 | 1320 | { |
cea0f0e7 AK |
1321 | if (!parent_pte) |
1322 | return; | |
cea0f0e7 | 1323 | |
67052b35 | 1324 | pte_list_add(vcpu, parent_pte, &sp->parent_ptes); |
cea0f0e7 AK |
1325 | } |
1326 | ||
4db35314 | 1327 | static void mmu_page_remove_parent_pte(struct kvm_mmu_page *sp, |
cea0f0e7 AK |
1328 | u64 *parent_pte) |
1329 | { | |
67052b35 | 1330 | pte_list_remove(parent_pte, &sp->parent_ptes); |
cea0f0e7 AK |
1331 | } |
1332 | ||
bcdd9a93 XG |
1333 | static void drop_parent_pte(struct kvm_mmu_page *sp, |
1334 | u64 *parent_pte) | |
1335 | { | |
1336 | mmu_page_remove_parent_pte(sp, parent_pte); | |
1df9f2dc | 1337 | mmu_spte_clear_no_track(parent_pte); |
bcdd9a93 XG |
1338 | } |
1339 | ||
67052b35 XG |
1340 | static struct kvm_mmu_page *kvm_mmu_alloc_page(struct kvm_vcpu *vcpu, |
1341 | u64 *parent_pte, int direct) | |
ad8cfbe3 | 1342 | { |
67052b35 XG |
1343 | struct kvm_mmu_page *sp; |
1344 | sp = mmu_memory_cache_alloc(&vcpu->arch.mmu_page_header_cache, | |
1345 | sizeof *sp); | |
1346 | sp->spt = mmu_memory_cache_alloc(&vcpu->arch.mmu_page_cache, PAGE_SIZE); | |
1347 | if (!direct) | |
1348 | sp->gfns = mmu_memory_cache_alloc(&vcpu->arch.mmu_page_cache, | |
1349 | PAGE_SIZE); | |
1350 | set_page_private(virt_to_page(sp->spt), (unsigned long)sp); | |
1351 | list_add(&sp->link, &vcpu->kvm->arch.active_mmu_pages); | |
93a5cef0 | 1352 | bitmap_zero(sp->slot_bitmap, KVM_MEM_SLOTS_NUM); |
67052b35 XG |
1353 | sp->parent_ptes = 0; |
1354 | mmu_page_add_parent_pte(vcpu, sp, parent_pte); | |
1355 | kvm_mod_used_mmu_pages(vcpu->kvm, +1); | |
1356 | return sp; | |
ad8cfbe3 MT |
1357 | } |
1358 | ||
67052b35 | 1359 | static void mark_unsync(u64 *spte); |
1047df1f | 1360 | static void kvm_mmu_mark_parents_unsync(struct kvm_mmu_page *sp) |
0074ff63 | 1361 | { |
67052b35 | 1362 | pte_list_walk(&sp->parent_ptes, mark_unsync); |
0074ff63 MT |
1363 | } |
1364 | ||
67052b35 | 1365 | static void mark_unsync(u64 *spte) |
0074ff63 | 1366 | { |
67052b35 | 1367 | struct kvm_mmu_page *sp; |
1047df1f | 1368 | unsigned int index; |
0074ff63 | 1369 | |
67052b35 | 1370 | sp = page_header(__pa(spte)); |
1047df1f XG |
1371 | index = spte - sp->spt; |
1372 | if (__test_and_set_bit(index, sp->unsync_child_bitmap)) | |
0074ff63 | 1373 | return; |
1047df1f | 1374 | if (sp->unsync_children++) |
0074ff63 | 1375 | return; |
1047df1f | 1376 | kvm_mmu_mark_parents_unsync(sp); |
0074ff63 MT |
1377 | } |
1378 | ||
e8bc217a | 1379 | static int nonpaging_sync_page(struct kvm_vcpu *vcpu, |
a4a8e6f7 | 1380 | struct kvm_mmu_page *sp) |
e8bc217a MT |
1381 | { |
1382 | return 1; | |
1383 | } | |
1384 | ||
a7052897 MT |
1385 | static void nonpaging_invlpg(struct kvm_vcpu *vcpu, gva_t gva) |
1386 | { | |
1387 | } | |
1388 | ||
0f53b5b1 XG |
1389 | static void nonpaging_update_pte(struct kvm_vcpu *vcpu, |
1390 | struct kvm_mmu_page *sp, u64 *spte, | |
7c562522 | 1391 | const void *pte) |
0f53b5b1 XG |
1392 | { |
1393 | WARN_ON(1); | |
1394 | } | |
1395 | ||
60c8aec6 MT |
1396 | #define KVM_PAGE_ARRAY_NR 16 |
1397 | ||
1398 | struct kvm_mmu_pages { | |
1399 | struct mmu_page_and_offset { | |
1400 | struct kvm_mmu_page *sp; | |
1401 | unsigned int idx; | |
1402 | } page[KVM_PAGE_ARRAY_NR]; | |
1403 | unsigned int nr; | |
1404 | }; | |
1405 | ||
0074ff63 MT |
1406 | #define for_each_unsync_children(bitmap, idx) \ |
1407 | for (idx = find_first_bit(bitmap, 512); \ | |
1408 | idx < 512; \ | |
1409 | idx = find_next_bit(bitmap, 512, idx+1)) | |
1410 | ||
cded19f3 HE |
1411 | static int mmu_pages_add(struct kvm_mmu_pages *pvec, struct kvm_mmu_page *sp, |
1412 | int idx) | |
4731d4c7 | 1413 | { |
60c8aec6 | 1414 | int i; |
4731d4c7 | 1415 | |
60c8aec6 MT |
1416 | if (sp->unsync) |
1417 | for (i=0; i < pvec->nr; i++) | |
1418 | if (pvec->page[i].sp == sp) | |
1419 | return 0; | |
1420 | ||
1421 | pvec->page[pvec->nr].sp = sp; | |
1422 | pvec->page[pvec->nr].idx = idx; | |
1423 | pvec->nr++; | |
1424 | return (pvec->nr == KVM_PAGE_ARRAY_NR); | |
1425 | } | |
1426 | ||
1427 | static int __mmu_unsync_walk(struct kvm_mmu_page *sp, | |
1428 | struct kvm_mmu_pages *pvec) | |
1429 | { | |
1430 | int i, ret, nr_unsync_leaf = 0; | |
4731d4c7 | 1431 | |
0074ff63 | 1432 | for_each_unsync_children(sp->unsync_child_bitmap, i) { |
7a8f1a74 | 1433 | struct kvm_mmu_page *child; |
4731d4c7 MT |
1434 | u64 ent = sp->spt[i]; |
1435 | ||
7a8f1a74 XG |
1436 | if (!is_shadow_present_pte(ent) || is_large_pte(ent)) |
1437 | goto clear_child_bitmap; | |
1438 | ||
1439 | child = page_header(ent & PT64_BASE_ADDR_MASK); | |
1440 | ||
1441 | if (child->unsync_children) { | |
1442 | if (mmu_pages_add(pvec, child, i)) | |
1443 | return -ENOSPC; | |
1444 | ||
1445 | ret = __mmu_unsync_walk(child, pvec); | |
1446 | if (!ret) | |
1447 | goto clear_child_bitmap; | |
1448 | else if (ret > 0) | |
1449 | nr_unsync_leaf += ret; | |
1450 | else | |
1451 | return ret; | |
1452 | } else if (child->unsync) { | |
1453 | nr_unsync_leaf++; | |
1454 | if (mmu_pages_add(pvec, child, i)) | |
1455 | return -ENOSPC; | |
1456 | } else | |
1457 | goto clear_child_bitmap; | |
1458 | ||
1459 | continue; | |
1460 | ||
1461 | clear_child_bitmap: | |
1462 | __clear_bit(i, sp->unsync_child_bitmap); | |
1463 | sp->unsync_children--; | |
1464 | WARN_ON((int)sp->unsync_children < 0); | |
4731d4c7 MT |
1465 | } |
1466 | ||
4731d4c7 | 1467 | |
60c8aec6 MT |
1468 | return nr_unsync_leaf; |
1469 | } | |
1470 | ||
1471 | static int mmu_unsync_walk(struct kvm_mmu_page *sp, | |
1472 | struct kvm_mmu_pages *pvec) | |
1473 | { | |
1474 | if (!sp->unsync_children) | |
1475 | return 0; | |
1476 | ||
1477 | mmu_pages_add(pvec, sp, 0); | |
1478 | return __mmu_unsync_walk(sp, pvec); | |
4731d4c7 MT |
1479 | } |
1480 | ||
4731d4c7 MT |
1481 | static void kvm_unlink_unsync_page(struct kvm *kvm, struct kvm_mmu_page *sp) |
1482 | { | |
1483 | WARN_ON(!sp->unsync); | |
5e1b3ddb | 1484 | trace_kvm_mmu_sync_page(sp); |
4731d4c7 MT |
1485 | sp->unsync = 0; |
1486 | --kvm->stat.mmu_unsync; | |
1487 | } | |
1488 | ||
7775834a XG |
1489 | static int kvm_mmu_prepare_zap_page(struct kvm *kvm, struct kvm_mmu_page *sp, |
1490 | struct list_head *invalid_list); | |
1491 | static void kvm_mmu_commit_zap_page(struct kvm *kvm, | |
1492 | struct list_head *invalid_list); | |
4731d4c7 | 1493 | |
f41d335a XG |
1494 | #define for_each_gfn_sp(kvm, sp, gfn, pos) \ |
1495 | hlist_for_each_entry(sp, pos, \ | |
7ae680eb XG |
1496 | &(kvm)->arch.mmu_page_hash[kvm_page_table_hashfn(gfn)], hash_link) \ |
1497 | if ((sp)->gfn != (gfn)) {} else | |
1498 | ||
f41d335a XG |
1499 | #define for_each_gfn_indirect_valid_sp(kvm, sp, gfn, pos) \ |
1500 | hlist_for_each_entry(sp, pos, \ | |
7ae680eb XG |
1501 | &(kvm)->arch.mmu_page_hash[kvm_page_table_hashfn(gfn)], hash_link) \ |
1502 | if ((sp)->gfn != (gfn) || (sp)->role.direct || \ | |
1503 | (sp)->role.invalid) {} else | |
1504 | ||
f918b443 | 1505 | /* @sp->gfn should be write-protected at the call site */ |
1d9dc7e0 | 1506 | static int __kvm_sync_page(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp, |
d98ba053 | 1507 | struct list_head *invalid_list, bool clear_unsync) |
4731d4c7 | 1508 | { |
5b7e0102 | 1509 | if (sp->role.cr4_pae != !!is_pae(vcpu)) { |
d98ba053 | 1510 | kvm_mmu_prepare_zap_page(vcpu->kvm, sp, invalid_list); |
4731d4c7 MT |
1511 | return 1; |
1512 | } | |
1513 | ||
f918b443 | 1514 | if (clear_unsync) |
1d9dc7e0 | 1515 | kvm_unlink_unsync_page(vcpu->kvm, sp); |
1d9dc7e0 | 1516 | |
a4a8e6f7 | 1517 | if (vcpu->arch.mmu.sync_page(vcpu, sp)) { |
d98ba053 | 1518 | kvm_mmu_prepare_zap_page(vcpu->kvm, sp, invalid_list); |
4731d4c7 MT |
1519 | return 1; |
1520 | } | |
1521 | ||
1522 | kvm_mmu_flush_tlb(vcpu); | |
4731d4c7 MT |
1523 | return 0; |
1524 | } | |
1525 | ||
1d9dc7e0 XG |
1526 | static int kvm_sync_page_transient(struct kvm_vcpu *vcpu, |
1527 | struct kvm_mmu_page *sp) | |
1528 | { | |
d98ba053 | 1529 | LIST_HEAD(invalid_list); |
1d9dc7e0 XG |
1530 | int ret; |
1531 | ||
d98ba053 | 1532 | ret = __kvm_sync_page(vcpu, sp, &invalid_list, false); |
be71e061 | 1533 | if (ret) |
d98ba053 XG |
1534 | kvm_mmu_commit_zap_page(vcpu->kvm, &invalid_list); |
1535 | ||
1d9dc7e0 XG |
1536 | return ret; |
1537 | } | |
1538 | ||
d98ba053 XG |
1539 | static int kvm_sync_page(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp, |
1540 | struct list_head *invalid_list) | |
1d9dc7e0 | 1541 | { |
d98ba053 | 1542 | return __kvm_sync_page(vcpu, sp, invalid_list, true); |
1d9dc7e0 XG |
1543 | } |
1544 | ||
9f1a122f XG |
1545 | /* @gfn should be write-protected at the call site */ |
1546 | static void kvm_sync_pages(struct kvm_vcpu *vcpu, gfn_t gfn) | |
1547 | { | |
9f1a122f | 1548 | struct kvm_mmu_page *s; |
f41d335a | 1549 | struct hlist_node *node; |
d98ba053 | 1550 | LIST_HEAD(invalid_list); |
9f1a122f XG |
1551 | bool flush = false; |
1552 | ||
f41d335a | 1553 | for_each_gfn_indirect_valid_sp(vcpu->kvm, s, gfn, node) { |
7ae680eb | 1554 | if (!s->unsync) |
9f1a122f XG |
1555 | continue; |
1556 | ||
1557 | WARN_ON(s->role.level != PT_PAGE_TABLE_LEVEL); | |
a4a8e6f7 | 1558 | kvm_unlink_unsync_page(vcpu->kvm, s); |
9f1a122f | 1559 | if ((s->role.cr4_pae != !!is_pae(vcpu)) || |
a4a8e6f7 | 1560 | (vcpu->arch.mmu.sync_page(vcpu, s))) { |
d98ba053 | 1561 | kvm_mmu_prepare_zap_page(vcpu->kvm, s, &invalid_list); |
9f1a122f XG |
1562 | continue; |
1563 | } | |
9f1a122f XG |
1564 | flush = true; |
1565 | } | |
1566 | ||
d98ba053 | 1567 | kvm_mmu_commit_zap_page(vcpu->kvm, &invalid_list); |
9f1a122f XG |
1568 | if (flush) |
1569 | kvm_mmu_flush_tlb(vcpu); | |
1570 | } | |
1571 | ||
60c8aec6 MT |
1572 | struct mmu_page_path { |
1573 | struct kvm_mmu_page *parent[PT64_ROOT_LEVEL-1]; | |
1574 | unsigned int idx[PT64_ROOT_LEVEL-1]; | |
4731d4c7 MT |
1575 | }; |
1576 | ||
60c8aec6 MT |
1577 | #define for_each_sp(pvec, sp, parents, i) \ |
1578 | for (i = mmu_pages_next(&pvec, &parents, -1), \ | |
1579 | sp = pvec.page[i].sp; \ | |
1580 | i < pvec.nr && ({ sp = pvec.page[i].sp; 1;}); \ | |
1581 | i = mmu_pages_next(&pvec, &parents, i)) | |
1582 | ||
cded19f3 HE |
1583 | static int mmu_pages_next(struct kvm_mmu_pages *pvec, |
1584 | struct mmu_page_path *parents, | |
1585 | int i) | |
60c8aec6 MT |
1586 | { |
1587 | int n; | |
1588 | ||
1589 | for (n = i+1; n < pvec->nr; n++) { | |
1590 | struct kvm_mmu_page *sp = pvec->page[n].sp; | |
1591 | ||
1592 | if (sp->role.level == PT_PAGE_TABLE_LEVEL) { | |
1593 | parents->idx[0] = pvec->page[n].idx; | |
1594 | return n; | |
1595 | } | |
1596 | ||
1597 | parents->parent[sp->role.level-2] = sp; | |
1598 | parents->idx[sp->role.level-1] = pvec->page[n].idx; | |
1599 | } | |
1600 | ||
1601 | return n; | |
1602 | } | |
1603 | ||
cded19f3 | 1604 | static void mmu_pages_clear_parents(struct mmu_page_path *parents) |
4731d4c7 | 1605 | { |
60c8aec6 MT |
1606 | struct kvm_mmu_page *sp; |
1607 | unsigned int level = 0; | |
1608 | ||
1609 | do { | |
1610 | unsigned int idx = parents->idx[level]; | |
4731d4c7 | 1611 | |
60c8aec6 MT |
1612 | sp = parents->parent[level]; |
1613 | if (!sp) | |
1614 | return; | |
1615 | ||
1616 | --sp->unsync_children; | |
1617 | WARN_ON((int)sp->unsync_children < 0); | |
1618 | __clear_bit(idx, sp->unsync_child_bitmap); | |
1619 | level++; | |
1620 | } while (level < PT64_ROOT_LEVEL-1 && !sp->unsync_children); | |
4731d4c7 MT |
1621 | } |
1622 | ||
60c8aec6 MT |
1623 | static void kvm_mmu_pages_init(struct kvm_mmu_page *parent, |
1624 | struct mmu_page_path *parents, | |
1625 | struct kvm_mmu_pages *pvec) | |
4731d4c7 | 1626 | { |
60c8aec6 MT |
1627 | parents->parent[parent->role.level-1] = NULL; |
1628 | pvec->nr = 0; | |
1629 | } | |
4731d4c7 | 1630 | |
60c8aec6 MT |
1631 | static void mmu_sync_children(struct kvm_vcpu *vcpu, |
1632 | struct kvm_mmu_page *parent) | |
1633 | { | |
1634 | int i; | |
1635 | struct kvm_mmu_page *sp; | |
1636 | struct mmu_page_path parents; | |
1637 | struct kvm_mmu_pages pages; | |
d98ba053 | 1638 | LIST_HEAD(invalid_list); |
60c8aec6 MT |
1639 | |
1640 | kvm_mmu_pages_init(parent, &parents, &pages); | |
1641 | while (mmu_unsync_walk(parent, &pages)) { | |
b1a36821 MT |
1642 | int protected = 0; |
1643 | ||
1644 | for_each_sp(pages, sp, parents, i) | |
1645 | protected |= rmap_write_protect(vcpu->kvm, sp->gfn); | |
1646 | ||
1647 | if (protected) | |
1648 | kvm_flush_remote_tlbs(vcpu->kvm); | |
1649 | ||
60c8aec6 | 1650 | for_each_sp(pages, sp, parents, i) { |
d98ba053 | 1651 | kvm_sync_page(vcpu, sp, &invalid_list); |
60c8aec6 MT |
1652 | mmu_pages_clear_parents(&parents); |
1653 | } | |
d98ba053 | 1654 | kvm_mmu_commit_zap_page(vcpu->kvm, &invalid_list); |
4731d4c7 | 1655 | cond_resched_lock(&vcpu->kvm->mmu_lock); |
60c8aec6 MT |
1656 | kvm_mmu_pages_init(parent, &parents, &pages); |
1657 | } | |
4731d4c7 MT |
1658 | } |
1659 | ||
c3707958 XG |
1660 | static void init_shadow_page_table(struct kvm_mmu_page *sp) |
1661 | { | |
1662 | int i; | |
1663 | ||
1664 | for (i = 0; i < PT64_ENT_PER_PAGE; ++i) | |
1665 | sp->spt[i] = 0ull; | |
1666 | } | |
1667 | ||
a30f47cb XG |
1668 | static void __clear_sp_write_flooding_count(struct kvm_mmu_page *sp) |
1669 | { | |
1670 | sp->write_flooding_count = 0; | |
1671 | } | |
1672 | ||
1673 | static void clear_sp_write_flooding_count(u64 *spte) | |
1674 | { | |
1675 | struct kvm_mmu_page *sp = page_header(__pa(spte)); | |
1676 | ||
1677 | __clear_sp_write_flooding_count(sp); | |
1678 | } | |
1679 | ||
cea0f0e7 AK |
1680 | static struct kvm_mmu_page *kvm_mmu_get_page(struct kvm_vcpu *vcpu, |
1681 | gfn_t gfn, | |
1682 | gva_t gaddr, | |
1683 | unsigned level, | |
f6e2c02b | 1684 | int direct, |
41074d07 | 1685 | unsigned access, |
f7d9c7b7 | 1686 | u64 *parent_pte) |
cea0f0e7 AK |
1687 | { |
1688 | union kvm_mmu_page_role role; | |
cea0f0e7 | 1689 | unsigned quadrant; |
9f1a122f | 1690 | struct kvm_mmu_page *sp; |
f41d335a | 1691 | struct hlist_node *node; |
9f1a122f | 1692 | bool need_sync = false; |
cea0f0e7 | 1693 | |
a770f6f2 | 1694 | role = vcpu->arch.mmu.base_role; |
cea0f0e7 | 1695 | role.level = level; |
f6e2c02b | 1696 | role.direct = direct; |
84b0c8c6 | 1697 | if (role.direct) |
5b7e0102 | 1698 | role.cr4_pae = 0; |
41074d07 | 1699 | role.access = access; |
c5a78f2b JR |
1700 | if (!vcpu->arch.mmu.direct_map |
1701 | && vcpu->arch.mmu.root_level <= PT32_ROOT_LEVEL) { | |
cea0f0e7 AK |
1702 | quadrant = gaddr >> (PAGE_SHIFT + (PT64_PT_BITS * level)); |
1703 | quadrant &= (1 << ((PT32_PT_BITS - PT64_PT_BITS) * level)) - 1; | |
1704 | role.quadrant = quadrant; | |
1705 | } | |
f41d335a | 1706 | for_each_gfn_sp(vcpu->kvm, sp, gfn, node) { |
7ae680eb XG |
1707 | if (!need_sync && sp->unsync) |
1708 | need_sync = true; | |
4731d4c7 | 1709 | |
7ae680eb XG |
1710 | if (sp->role.word != role.word) |
1711 | continue; | |
4731d4c7 | 1712 | |
7ae680eb XG |
1713 | if (sp->unsync && kvm_sync_page_transient(vcpu, sp)) |
1714 | break; | |
e02aa901 | 1715 | |
7ae680eb XG |
1716 | mmu_page_add_parent_pte(vcpu, sp, parent_pte); |
1717 | if (sp->unsync_children) { | |
a8eeb04a | 1718 | kvm_make_request(KVM_REQ_MMU_SYNC, vcpu); |
7ae680eb XG |
1719 | kvm_mmu_mark_parents_unsync(sp); |
1720 | } else if (sp->unsync) | |
1721 | kvm_mmu_mark_parents_unsync(sp); | |
e02aa901 | 1722 | |
a30f47cb | 1723 | __clear_sp_write_flooding_count(sp); |
7ae680eb XG |
1724 | trace_kvm_mmu_get_page(sp, false); |
1725 | return sp; | |
1726 | } | |
dfc5aa00 | 1727 | ++vcpu->kvm->stat.mmu_cache_miss; |
2032a93d | 1728 | sp = kvm_mmu_alloc_page(vcpu, parent_pte, direct); |
4db35314 AK |
1729 | if (!sp) |
1730 | return sp; | |
4db35314 AK |
1731 | sp->gfn = gfn; |
1732 | sp->role = role; | |
7ae680eb XG |
1733 | hlist_add_head(&sp->hash_link, |
1734 | &vcpu->kvm->arch.mmu_page_hash[kvm_page_table_hashfn(gfn)]); | |
f6e2c02b | 1735 | if (!direct) { |
b1a36821 MT |
1736 | if (rmap_write_protect(vcpu->kvm, gfn)) |
1737 | kvm_flush_remote_tlbs(vcpu->kvm); | |
9f1a122f XG |
1738 | if (level > PT_PAGE_TABLE_LEVEL && need_sync) |
1739 | kvm_sync_pages(vcpu, gfn); | |
1740 | ||
4731d4c7 MT |
1741 | account_shadowed(vcpu->kvm, gfn); |
1742 | } | |
c3707958 | 1743 | init_shadow_page_table(sp); |
f691fe1d | 1744 | trace_kvm_mmu_get_page(sp, true); |
4db35314 | 1745 | return sp; |
cea0f0e7 AK |
1746 | } |
1747 | ||
2d11123a AK |
1748 | static void shadow_walk_init(struct kvm_shadow_walk_iterator *iterator, |
1749 | struct kvm_vcpu *vcpu, u64 addr) | |
1750 | { | |
1751 | iterator->addr = addr; | |
1752 | iterator->shadow_addr = vcpu->arch.mmu.root_hpa; | |
1753 | iterator->level = vcpu->arch.mmu.shadow_root_level; | |
81407ca5 JR |
1754 | |
1755 | if (iterator->level == PT64_ROOT_LEVEL && | |
1756 | vcpu->arch.mmu.root_level < PT64_ROOT_LEVEL && | |
1757 | !vcpu->arch.mmu.direct_map) | |
1758 | --iterator->level; | |
1759 | ||
2d11123a AK |
1760 | if (iterator->level == PT32E_ROOT_LEVEL) { |
1761 | iterator->shadow_addr | |
1762 | = vcpu->arch.mmu.pae_root[(addr >> 30) & 3]; | |
1763 | iterator->shadow_addr &= PT64_BASE_ADDR_MASK; | |
1764 | --iterator->level; | |
1765 | if (!iterator->shadow_addr) | |
1766 | iterator->level = 0; | |
1767 | } | |
1768 | } | |
1769 | ||
1770 | static bool shadow_walk_okay(struct kvm_shadow_walk_iterator *iterator) | |
1771 | { | |
1772 | if (iterator->level < PT_PAGE_TABLE_LEVEL) | |
1773 | return false; | |
4d88954d | 1774 | |
2d11123a AK |
1775 | iterator->index = SHADOW_PT_INDEX(iterator->addr, iterator->level); |
1776 | iterator->sptep = ((u64 *)__va(iterator->shadow_addr)) + iterator->index; | |
1777 | return true; | |
1778 | } | |
1779 | ||
c2a2ac2b XG |
1780 | static void __shadow_walk_next(struct kvm_shadow_walk_iterator *iterator, |
1781 | u64 spte) | |
2d11123a | 1782 | { |
c2a2ac2b | 1783 | if (is_last_spte(spte, iterator->level)) { |
052331be XG |
1784 | iterator->level = 0; |
1785 | return; | |
1786 | } | |
1787 | ||
c2a2ac2b | 1788 | iterator->shadow_addr = spte & PT64_BASE_ADDR_MASK; |
2d11123a AK |
1789 | --iterator->level; |
1790 | } | |
1791 | ||
c2a2ac2b XG |
1792 | static void shadow_walk_next(struct kvm_shadow_walk_iterator *iterator) |
1793 | { | |
1794 | return __shadow_walk_next(iterator, *iterator->sptep); | |
1795 | } | |
1796 | ||
32ef26a3 AK |
1797 | static void link_shadow_page(u64 *sptep, struct kvm_mmu_page *sp) |
1798 | { | |
1799 | u64 spte; | |
1800 | ||
1801 | spte = __pa(sp->spt) | |
1802 | | PT_PRESENT_MASK | PT_ACCESSED_MASK | |
1803 | | PT_WRITABLE_MASK | PT_USER_MASK; | |
1df9f2dc | 1804 | mmu_spte_set(sptep, spte); |
32ef26a3 AK |
1805 | } |
1806 | ||
a3aa51cf AK |
1807 | static void drop_large_spte(struct kvm_vcpu *vcpu, u64 *sptep) |
1808 | { | |
1809 | if (is_large_pte(*sptep)) { | |
c3707958 | 1810 | drop_spte(vcpu->kvm, sptep); |
a3aa51cf AK |
1811 | kvm_flush_remote_tlbs(vcpu->kvm); |
1812 | } | |
1813 | } | |
1814 | ||
a357bd22 AK |
1815 | static void validate_direct_spte(struct kvm_vcpu *vcpu, u64 *sptep, |
1816 | unsigned direct_access) | |
1817 | { | |
1818 | if (is_shadow_present_pte(*sptep) && !is_large_pte(*sptep)) { | |
1819 | struct kvm_mmu_page *child; | |
1820 | ||
1821 | /* | |
1822 | * For the direct sp, if the guest pte's dirty bit | |
1823 | * changed form clean to dirty, it will corrupt the | |
1824 | * sp's access: allow writable in the read-only sp, | |
1825 | * so we should update the spte at this point to get | |
1826 | * a new sp with the correct access. | |
1827 | */ | |
1828 | child = page_header(*sptep & PT64_BASE_ADDR_MASK); | |
1829 | if (child->role.access == direct_access) | |
1830 | return; | |
1831 | ||
bcdd9a93 | 1832 | drop_parent_pte(child, sptep); |
a357bd22 AK |
1833 | kvm_flush_remote_tlbs(vcpu->kvm); |
1834 | } | |
1835 | } | |
1836 | ||
505aef8f | 1837 | static bool mmu_page_zap_pte(struct kvm *kvm, struct kvm_mmu_page *sp, |
38e3b2b2 XG |
1838 | u64 *spte) |
1839 | { | |
1840 | u64 pte; | |
1841 | struct kvm_mmu_page *child; | |
1842 | ||
1843 | pte = *spte; | |
1844 | if (is_shadow_present_pte(pte)) { | |
505aef8f | 1845 | if (is_last_spte(pte, sp->role.level)) { |
c3707958 | 1846 | drop_spte(kvm, spte); |
505aef8f XG |
1847 | if (is_large_pte(pte)) |
1848 | --kvm->stat.lpages; | |
1849 | } else { | |
38e3b2b2 | 1850 | child = page_header(pte & PT64_BASE_ADDR_MASK); |
bcdd9a93 | 1851 | drop_parent_pte(child, spte); |
38e3b2b2 | 1852 | } |
505aef8f XG |
1853 | return true; |
1854 | } | |
1855 | ||
1856 | if (is_mmio_spte(pte)) | |
ce88decf | 1857 | mmu_spte_clear_no_track(spte); |
c3707958 | 1858 | |
505aef8f | 1859 | return false; |
38e3b2b2 XG |
1860 | } |
1861 | ||
90cb0529 | 1862 | static void kvm_mmu_page_unlink_children(struct kvm *kvm, |
4db35314 | 1863 | struct kvm_mmu_page *sp) |
a436036b | 1864 | { |
697fe2e2 | 1865 | unsigned i; |
697fe2e2 | 1866 | |
38e3b2b2 XG |
1867 | for (i = 0; i < PT64_ENT_PER_PAGE; ++i) |
1868 | mmu_page_zap_pte(kvm, sp, sp->spt + i); | |
a436036b AK |
1869 | } |
1870 | ||
4db35314 | 1871 | static void kvm_mmu_put_page(struct kvm_mmu_page *sp, u64 *parent_pte) |
cea0f0e7 | 1872 | { |
4db35314 | 1873 | mmu_page_remove_parent_pte(sp, parent_pte); |
a436036b AK |
1874 | } |
1875 | ||
31aa2b44 | 1876 | static void kvm_mmu_unlink_parents(struct kvm *kvm, struct kvm_mmu_page *sp) |
a436036b AK |
1877 | { |
1878 | u64 *parent_pte; | |
1879 | ||
bcdd9a93 XG |
1880 | while ((parent_pte = pte_list_next(&sp->parent_ptes, NULL))) |
1881 | drop_parent_pte(sp, parent_pte); | |
31aa2b44 AK |
1882 | } |
1883 | ||
60c8aec6 | 1884 | static int mmu_zap_unsync_children(struct kvm *kvm, |
7775834a XG |
1885 | struct kvm_mmu_page *parent, |
1886 | struct list_head *invalid_list) | |
4731d4c7 | 1887 | { |
60c8aec6 MT |
1888 | int i, zapped = 0; |
1889 | struct mmu_page_path parents; | |
1890 | struct kvm_mmu_pages pages; | |
4731d4c7 | 1891 | |
60c8aec6 | 1892 | if (parent->role.level == PT_PAGE_TABLE_LEVEL) |
4731d4c7 | 1893 | return 0; |
60c8aec6 MT |
1894 | |
1895 | kvm_mmu_pages_init(parent, &parents, &pages); | |
1896 | while (mmu_unsync_walk(parent, &pages)) { | |
1897 | struct kvm_mmu_page *sp; | |
1898 | ||
1899 | for_each_sp(pages, sp, parents, i) { | |
7775834a | 1900 | kvm_mmu_prepare_zap_page(kvm, sp, invalid_list); |
60c8aec6 | 1901 | mmu_pages_clear_parents(&parents); |
77662e00 | 1902 | zapped++; |
60c8aec6 | 1903 | } |
60c8aec6 MT |
1904 | kvm_mmu_pages_init(parent, &parents, &pages); |
1905 | } | |
1906 | ||
1907 | return zapped; | |
4731d4c7 MT |
1908 | } |
1909 | ||
7775834a XG |
1910 | static int kvm_mmu_prepare_zap_page(struct kvm *kvm, struct kvm_mmu_page *sp, |
1911 | struct list_head *invalid_list) | |
31aa2b44 | 1912 | { |
4731d4c7 | 1913 | int ret; |
f691fe1d | 1914 | |
7775834a | 1915 | trace_kvm_mmu_prepare_zap_page(sp); |
31aa2b44 | 1916 | ++kvm->stat.mmu_shadow_zapped; |
7775834a | 1917 | ret = mmu_zap_unsync_children(kvm, sp, invalid_list); |
4db35314 | 1918 | kvm_mmu_page_unlink_children(kvm, sp); |
31aa2b44 | 1919 | kvm_mmu_unlink_parents(kvm, sp); |
f6e2c02b | 1920 | if (!sp->role.invalid && !sp->role.direct) |
5b5c6a5a | 1921 | unaccount_shadowed(kvm, sp->gfn); |
4731d4c7 MT |
1922 | if (sp->unsync) |
1923 | kvm_unlink_unsync_page(kvm, sp); | |
4db35314 | 1924 | if (!sp->root_count) { |
54a4f023 GJ |
1925 | /* Count self */ |
1926 | ret++; | |
7775834a | 1927 | list_move(&sp->link, invalid_list); |
aa6bd187 | 1928 | kvm_mod_used_mmu_pages(kvm, -1); |
2e53d63a | 1929 | } else { |
5b5c6a5a | 1930 | list_move(&sp->link, &kvm->arch.active_mmu_pages); |
2e53d63a MT |
1931 | kvm_reload_remote_mmus(kvm); |
1932 | } | |
7775834a XG |
1933 | |
1934 | sp->role.invalid = 1; | |
4731d4c7 | 1935 | return ret; |
a436036b AK |
1936 | } |
1937 | ||
c2a2ac2b XG |
1938 | static void kvm_mmu_isolate_pages(struct list_head *invalid_list) |
1939 | { | |
1940 | struct kvm_mmu_page *sp; | |
1941 | ||
1942 | list_for_each_entry(sp, invalid_list, link) | |
1943 | kvm_mmu_isolate_page(sp); | |
1944 | } | |
1945 | ||
1946 | static void free_pages_rcu(struct rcu_head *head) | |
1947 | { | |
1948 | struct kvm_mmu_page *next, *sp; | |
1949 | ||
1950 | sp = container_of(head, struct kvm_mmu_page, rcu); | |
1951 | while (sp) { | |
1952 | if (!list_empty(&sp->link)) | |
1953 | next = list_first_entry(&sp->link, | |
1954 | struct kvm_mmu_page, link); | |
1955 | else | |
1956 | next = NULL; | |
1957 | kvm_mmu_free_page(sp); | |
1958 | sp = next; | |
1959 | } | |
1960 | } | |
1961 | ||
7775834a XG |
1962 | static void kvm_mmu_commit_zap_page(struct kvm *kvm, |
1963 | struct list_head *invalid_list) | |
1964 | { | |
1965 | struct kvm_mmu_page *sp; | |
1966 | ||
1967 | if (list_empty(invalid_list)) | |
1968 | return; | |
1969 | ||
1970 | kvm_flush_remote_tlbs(kvm); | |
1971 | ||
c2a2ac2b XG |
1972 | if (atomic_read(&kvm->arch.reader_counter)) { |
1973 | kvm_mmu_isolate_pages(invalid_list); | |
1974 | sp = list_first_entry(invalid_list, struct kvm_mmu_page, link); | |
1975 | list_del_init(invalid_list); | |
4f022648 XG |
1976 | |
1977 | trace_kvm_mmu_delay_free_pages(sp); | |
c2a2ac2b XG |
1978 | call_rcu(&sp->rcu, free_pages_rcu); |
1979 | return; | |
1980 | } | |
1981 | ||
7775834a XG |
1982 | do { |
1983 | sp = list_first_entry(invalid_list, struct kvm_mmu_page, link); | |
1984 | WARN_ON(!sp->role.invalid || sp->root_count); | |
bd4c86ea | 1985 | kvm_mmu_isolate_page(sp); |
aa6bd187 | 1986 | kvm_mmu_free_page(sp); |
7775834a XG |
1987 | } while (!list_empty(invalid_list)); |
1988 | ||
1989 | } | |
1990 | ||
82ce2c96 IE |
1991 | /* |
1992 | * Changing the number of mmu pages allocated to the vm | |
49d5ca26 | 1993 | * Note: if goal_nr_mmu_pages is too small, you will get dead lock |
82ce2c96 | 1994 | */ |
49d5ca26 | 1995 | void kvm_mmu_change_mmu_pages(struct kvm *kvm, unsigned int goal_nr_mmu_pages) |
82ce2c96 | 1996 | { |
d98ba053 | 1997 | LIST_HEAD(invalid_list); |
82ce2c96 IE |
1998 | /* |
1999 | * If we set the number of mmu pages to be smaller be than the | |
2000 | * number of actived pages , we must to free some mmu pages before we | |
2001 | * change the value | |
2002 | */ | |
2003 | ||
49d5ca26 DH |
2004 | if (kvm->arch.n_used_mmu_pages > goal_nr_mmu_pages) { |
2005 | while (kvm->arch.n_used_mmu_pages > goal_nr_mmu_pages && | |
77662e00 | 2006 | !list_empty(&kvm->arch.active_mmu_pages)) { |
82ce2c96 IE |
2007 | struct kvm_mmu_page *page; |
2008 | ||
f05e70ac | 2009 | page = container_of(kvm->arch.active_mmu_pages.prev, |
82ce2c96 | 2010 | struct kvm_mmu_page, link); |
80b63faf | 2011 | kvm_mmu_prepare_zap_page(kvm, page, &invalid_list); |
82ce2c96 | 2012 | } |
aa6bd187 | 2013 | kvm_mmu_commit_zap_page(kvm, &invalid_list); |
49d5ca26 | 2014 | goal_nr_mmu_pages = kvm->arch.n_used_mmu_pages; |
82ce2c96 | 2015 | } |
82ce2c96 | 2016 | |
49d5ca26 | 2017 | kvm->arch.n_max_mmu_pages = goal_nr_mmu_pages; |
82ce2c96 IE |
2018 | } |
2019 | ||
1cb3f3ae | 2020 | int kvm_mmu_unprotect_page(struct kvm *kvm, gfn_t gfn) |
a436036b | 2021 | { |
4db35314 | 2022 | struct kvm_mmu_page *sp; |
f41d335a | 2023 | struct hlist_node *node; |
d98ba053 | 2024 | LIST_HEAD(invalid_list); |
a436036b AK |
2025 | int r; |
2026 | ||
9ad17b10 | 2027 | pgprintk("%s: looking for gfn %llx\n", __func__, gfn); |
a436036b | 2028 | r = 0; |
1cb3f3ae | 2029 | spin_lock(&kvm->mmu_lock); |
f41d335a | 2030 | for_each_gfn_indirect_valid_sp(kvm, sp, gfn, node) { |
9ad17b10 | 2031 | pgprintk("%s: gfn %llx role %x\n", __func__, gfn, |
7ae680eb XG |
2032 | sp->role.word); |
2033 | r = 1; | |
f41d335a | 2034 | kvm_mmu_prepare_zap_page(kvm, sp, &invalid_list); |
7ae680eb | 2035 | } |
d98ba053 | 2036 | kvm_mmu_commit_zap_page(kvm, &invalid_list); |
1cb3f3ae XG |
2037 | spin_unlock(&kvm->mmu_lock); |
2038 | ||
a436036b | 2039 | return r; |
cea0f0e7 | 2040 | } |
1cb3f3ae | 2041 | EXPORT_SYMBOL_GPL(kvm_mmu_unprotect_page); |
cea0f0e7 | 2042 | |
38c335f1 | 2043 | static void page_header_update_slot(struct kvm *kvm, void *pte, gfn_t gfn) |
6aa8b732 | 2044 | { |
bc6678a3 | 2045 | int slot = memslot_id(kvm, gfn); |
4db35314 | 2046 | struct kvm_mmu_page *sp = page_header(__pa(pte)); |
6aa8b732 | 2047 | |
291f26bc | 2048 | __set_bit(slot, sp->slot_bitmap); |
6aa8b732 AK |
2049 | } |
2050 | ||
74be52e3 SY |
2051 | /* |
2052 | * The function is based on mtrr_type_lookup() in | |
2053 | * arch/x86/kernel/cpu/mtrr/generic.c | |
2054 | */ | |
2055 | static int get_mtrr_type(struct mtrr_state_type *mtrr_state, | |
2056 | u64 start, u64 end) | |
2057 | { | |
2058 | int i; | |
2059 | u64 base, mask; | |
2060 | u8 prev_match, curr_match; | |
2061 | int num_var_ranges = KVM_NR_VAR_MTRR; | |
2062 | ||
2063 | if (!mtrr_state->enabled) | |
2064 | return 0xFF; | |
2065 | ||
2066 | /* Make end inclusive end, instead of exclusive */ | |
2067 | end--; | |
2068 | ||
2069 | /* Look in fixed ranges. Just return the type as per start */ | |
2070 | if (mtrr_state->have_fixed && (start < 0x100000)) { | |
2071 | int idx; | |
2072 | ||
2073 | if (start < 0x80000) { | |
2074 | idx = 0; | |
2075 | idx += (start >> 16); | |
2076 | return mtrr_state->fixed_ranges[idx]; | |
2077 | } else if (start < 0xC0000) { | |
2078 | idx = 1 * 8; | |
2079 | idx += ((start - 0x80000) >> 14); | |
2080 | return mtrr_state->fixed_ranges[idx]; | |
2081 | } else if (start < 0x1000000) { | |
2082 | idx = 3 * 8; | |
2083 | idx += ((start - 0xC0000) >> 12); | |
2084 | return mtrr_state->fixed_ranges[idx]; | |
2085 | } | |
2086 | } | |
2087 | ||
2088 | /* | |
2089 | * Look in variable ranges | |
2090 | * Look of multiple ranges matching this address and pick type | |
2091 | * as per MTRR precedence | |
2092 | */ | |
2093 | if (!(mtrr_state->enabled & 2)) | |
2094 | return mtrr_state->def_type; | |
2095 | ||
2096 | prev_match = 0xFF; | |
2097 | for (i = 0; i < num_var_ranges; ++i) { | |
2098 | unsigned short start_state, end_state; | |
2099 | ||
2100 | if (!(mtrr_state->var_ranges[i].mask_lo & (1 << 11))) | |
2101 | continue; | |
2102 | ||
2103 | base = (((u64)mtrr_state->var_ranges[i].base_hi) << 32) + | |
2104 | (mtrr_state->var_ranges[i].base_lo & PAGE_MASK); | |
2105 | mask = (((u64)mtrr_state->var_ranges[i].mask_hi) << 32) + | |
2106 | (mtrr_state->var_ranges[i].mask_lo & PAGE_MASK); | |
2107 | ||
2108 | start_state = ((start & mask) == (base & mask)); | |
2109 | end_state = ((end & mask) == (base & mask)); | |
2110 | if (start_state != end_state) | |
2111 | return 0xFE; | |
2112 | ||
2113 | if ((start & mask) != (base & mask)) | |
2114 | continue; | |
2115 | ||
2116 | curr_match = mtrr_state->var_ranges[i].base_lo & 0xff; | |
2117 | if (prev_match == 0xFF) { | |
2118 | prev_match = curr_match; | |
2119 | continue; | |
2120 | } | |
2121 | ||
2122 | if (prev_match == MTRR_TYPE_UNCACHABLE || | |
2123 | curr_match == MTRR_TYPE_UNCACHABLE) | |
2124 | return MTRR_TYPE_UNCACHABLE; | |
2125 | ||
2126 | if ((prev_match == MTRR_TYPE_WRBACK && | |
2127 | curr_match == MTRR_TYPE_WRTHROUGH) || | |
2128 | (prev_match == MTRR_TYPE_WRTHROUGH && | |
2129 | curr_match == MTRR_TYPE_WRBACK)) { | |
2130 | prev_match = MTRR_TYPE_WRTHROUGH; | |
2131 | curr_match = MTRR_TYPE_WRTHROUGH; | |
2132 | } | |
2133 | ||
2134 | if (prev_match != curr_match) | |
2135 | return MTRR_TYPE_UNCACHABLE; | |
2136 | } | |
2137 | ||
2138 | if (prev_match != 0xFF) | |
2139 | return prev_match; | |
2140 | ||
2141 | return mtrr_state->def_type; | |
2142 | } | |
2143 | ||
4b12f0de | 2144 | u8 kvm_get_guest_memory_type(struct kvm_vcpu *vcpu, gfn_t gfn) |
74be52e3 SY |
2145 | { |
2146 | u8 mtrr; | |
2147 | ||
2148 | mtrr = get_mtrr_type(&vcpu->arch.mtrr_state, gfn << PAGE_SHIFT, | |
2149 | (gfn << PAGE_SHIFT) + PAGE_SIZE); | |
2150 | if (mtrr == 0xfe || mtrr == 0xff) | |
2151 | mtrr = MTRR_TYPE_WRBACK; | |
2152 | return mtrr; | |
2153 | } | |
4b12f0de | 2154 | EXPORT_SYMBOL_GPL(kvm_get_guest_memory_type); |
74be52e3 | 2155 | |
9cf5cf5a XG |
2156 | static void __kvm_unsync_page(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp) |
2157 | { | |
2158 | trace_kvm_mmu_unsync_page(sp); | |
2159 | ++vcpu->kvm->stat.mmu_unsync; | |
2160 | sp->unsync = 1; | |
2161 | ||
2162 | kvm_mmu_mark_parents_unsync(sp); | |
9cf5cf5a XG |
2163 | } |
2164 | ||
2165 | static void kvm_unsync_pages(struct kvm_vcpu *vcpu, gfn_t gfn) | |
4731d4c7 | 2166 | { |
4731d4c7 | 2167 | struct kvm_mmu_page *s; |
f41d335a | 2168 | struct hlist_node *node; |
9cf5cf5a | 2169 | |
f41d335a | 2170 | for_each_gfn_indirect_valid_sp(vcpu->kvm, s, gfn, node) { |
7ae680eb | 2171 | if (s->unsync) |
4731d4c7 | 2172 | continue; |
9cf5cf5a XG |
2173 | WARN_ON(s->role.level != PT_PAGE_TABLE_LEVEL); |
2174 | __kvm_unsync_page(vcpu, s); | |
4731d4c7 | 2175 | } |
4731d4c7 MT |
2176 | } |
2177 | ||
2178 | static int mmu_need_write_protect(struct kvm_vcpu *vcpu, gfn_t gfn, | |
2179 | bool can_unsync) | |
2180 | { | |
9cf5cf5a | 2181 | struct kvm_mmu_page *s; |
f41d335a | 2182 | struct hlist_node *node; |
9cf5cf5a XG |
2183 | bool need_unsync = false; |
2184 | ||
f41d335a | 2185 | for_each_gfn_indirect_valid_sp(vcpu->kvm, s, gfn, node) { |
36a2e677 XG |
2186 | if (!can_unsync) |
2187 | return 1; | |
2188 | ||
9cf5cf5a | 2189 | if (s->role.level != PT_PAGE_TABLE_LEVEL) |
4731d4c7 | 2190 | return 1; |
9cf5cf5a XG |
2191 | |
2192 | if (!need_unsync && !s->unsync) { | |
36a2e677 | 2193 | if (!oos_shadow) |
9cf5cf5a XG |
2194 | return 1; |
2195 | need_unsync = true; | |
2196 | } | |
4731d4c7 | 2197 | } |
9cf5cf5a XG |
2198 | if (need_unsync) |
2199 | kvm_unsync_pages(vcpu, gfn); | |
4731d4c7 MT |
2200 | return 0; |
2201 | } | |
2202 | ||
d555c333 | 2203 | static int set_spte(struct kvm_vcpu *vcpu, u64 *sptep, |
1e73f9dd | 2204 | unsigned pte_access, int user_fault, |
640d9b0d | 2205 | int write_fault, int level, |
c2d0ee46 | 2206 | gfn_t gfn, pfn_t pfn, bool speculative, |
9bdbba13 | 2207 | bool can_unsync, bool host_writable) |
1c4f1fd6 | 2208 | { |
b330aa0c | 2209 | u64 spte, entry = *sptep; |
1e73f9dd | 2210 | int ret = 0; |
64d4d521 | 2211 | |
ce88decf XG |
2212 | if (set_mmio_spte(sptep, gfn, pfn, pte_access)) |
2213 | return 0; | |
2214 | ||
982c2565 | 2215 | spte = PT_PRESENT_MASK; |
947da538 | 2216 | if (!speculative) |
3201b5d9 | 2217 | spte |= shadow_accessed_mask; |
640d9b0d | 2218 | |
7b52345e SY |
2219 | if (pte_access & ACC_EXEC_MASK) |
2220 | spte |= shadow_x_mask; | |
2221 | else | |
2222 | spte |= shadow_nx_mask; | |
1c4f1fd6 | 2223 | if (pte_access & ACC_USER_MASK) |
7b52345e | 2224 | spte |= shadow_user_mask; |
852e3c19 | 2225 | if (level > PT_PAGE_TABLE_LEVEL) |
05da4558 | 2226 | spte |= PT_PAGE_SIZE_MASK; |
b0bc3ee2 | 2227 | if (tdp_enabled) |
4b12f0de SY |
2228 | spte |= kvm_x86_ops->get_mt_mask(vcpu, gfn, |
2229 | kvm_is_mmio_pfn(pfn)); | |
1c4f1fd6 | 2230 | |
9bdbba13 | 2231 | if (host_writable) |
1403283a | 2232 | spte |= SPTE_HOST_WRITEABLE; |
f8e453b0 XG |
2233 | else |
2234 | pte_access &= ~ACC_WRITE_MASK; | |
1403283a | 2235 | |
35149e21 | 2236 | spte |= (u64)pfn << PAGE_SHIFT; |
1c4f1fd6 AK |
2237 | |
2238 | if ((pte_access & ACC_WRITE_MASK) | |
c5a78f2b JR |
2239 | || (!vcpu->arch.mmu.direct_map && write_fault |
2240 | && !is_write_protection(vcpu) && !user_fault)) { | |
1c4f1fd6 | 2241 | |
852e3c19 JR |
2242 | if (level > PT_PAGE_TABLE_LEVEL && |
2243 | has_wrprotected_page(vcpu->kvm, gfn, level)) { | |
38187c83 | 2244 | ret = 1; |
c3707958 | 2245 | drop_spte(vcpu->kvm, sptep); |
be38d276 | 2246 | goto done; |
38187c83 MT |
2247 | } |
2248 | ||
1c4f1fd6 | 2249 | spte |= PT_WRITABLE_MASK; |
1c4f1fd6 | 2250 | |
c5a78f2b | 2251 | if (!vcpu->arch.mmu.direct_map |
411c588d | 2252 | && !(pte_access & ACC_WRITE_MASK)) { |
69325a12 | 2253 | spte &= ~PT_USER_MASK; |
411c588d AK |
2254 | /* |
2255 | * If we converted a user page to a kernel page, | |
2256 | * so that the kernel can write to it when cr0.wp=0, | |
2257 | * then we should prevent the kernel from executing it | |
2258 | * if SMEP is enabled. | |
2259 | */ | |
2260 | if (kvm_read_cr4_bits(vcpu, X86_CR4_SMEP)) | |
2261 | spte |= PT64_NX_MASK; | |
2262 | } | |
69325a12 | 2263 | |
ecc5589f MT |
2264 | /* |
2265 | * Optimization: for pte sync, if spte was writable the hash | |
2266 | * lookup is unnecessary (and expensive). Write protection | |
2267 | * is responsibility of mmu_get_page / kvm_sync_page. | |
2268 | * Same reasoning can be applied to dirty page accounting. | |
2269 | */ | |
8dae4445 | 2270 | if (!can_unsync && is_writable_pte(*sptep)) |
ecc5589f MT |
2271 | goto set_pte; |
2272 | ||
4731d4c7 | 2273 | if (mmu_need_write_protect(vcpu, gfn, can_unsync)) { |
9ad17b10 | 2274 | pgprintk("%s: found shadow page for %llx, marking ro\n", |
b8688d51 | 2275 | __func__, gfn); |
1e73f9dd | 2276 | ret = 1; |
1c4f1fd6 | 2277 | pte_access &= ~ACC_WRITE_MASK; |
8dae4445 | 2278 | if (is_writable_pte(spte)) |
1c4f1fd6 | 2279 | spte &= ~PT_WRITABLE_MASK; |
1c4f1fd6 AK |
2280 | } |
2281 | } | |
2282 | ||
1c4f1fd6 AK |
2283 | if (pte_access & ACC_WRITE_MASK) |
2284 | mark_page_dirty(vcpu->kvm, gfn); | |
2285 | ||
38187c83 | 2286 | set_pte: |
1df9f2dc | 2287 | mmu_spte_update(sptep, spte); |
b330aa0c XG |
2288 | /* |
2289 | * If we overwrite a writable spte with a read-only one we | |
2290 | * should flush remote TLBs. Otherwise rmap_write_protect | |
2291 | * will find a read-only spte, even though the writable spte | |
2292 | * might be cached on a CPU's TLB. | |
2293 | */ | |
2294 | if (is_writable_pte(entry) && !is_writable_pte(*sptep)) | |
2295 | kvm_flush_remote_tlbs(vcpu->kvm); | |
be38d276 | 2296 | done: |
1e73f9dd MT |
2297 | return ret; |
2298 | } | |
2299 | ||
d555c333 | 2300 | static void mmu_set_spte(struct kvm_vcpu *vcpu, u64 *sptep, |
1e73f9dd | 2301 | unsigned pt_access, unsigned pte_access, |
640d9b0d | 2302 | int user_fault, int write_fault, |
b90a0e6c | 2303 | int *emulate, int level, gfn_t gfn, |
1403283a | 2304 | pfn_t pfn, bool speculative, |
9bdbba13 | 2305 | bool host_writable) |
1e73f9dd MT |
2306 | { |
2307 | int was_rmapped = 0; | |
53a27b39 | 2308 | int rmap_count; |
1e73f9dd MT |
2309 | |
2310 | pgprintk("%s: spte %llx access %x write_fault %d" | |
9ad17b10 | 2311 | " user_fault %d gfn %llx\n", |
d555c333 | 2312 | __func__, *sptep, pt_access, |
1e73f9dd MT |
2313 | write_fault, user_fault, gfn); |
2314 | ||
d555c333 | 2315 | if (is_rmap_spte(*sptep)) { |
1e73f9dd MT |
2316 | /* |
2317 | * If we overwrite a PTE page pointer with a 2MB PMD, unlink | |
2318 | * the parent of the now unreachable PTE. | |
2319 | */ | |
852e3c19 JR |
2320 | if (level > PT_PAGE_TABLE_LEVEL && |
2321 | !is_large_pte(*sptep)) { | |
1e73f9dd | 2322 | struct kvm_mmu_page *child; |
d555c333 | 2323 | u64 pte = *sptep; |
1e73f9dd MT |
2324 | |
2325 | child = page_header(pte & PT64_BASE_ADDR_MASK); | |
bcdd9a93 | 2326 | drop_parent_pte(child, sptep); |
3be2264b | 2327 | kvm_flush_remote_tlbs(vcpu->kvm); |
d555c333 | 2328 | } else if (pfn != spte_to_pfn(*sptep)) { |
9ad17b10 | 2329 | pgprintk("hfn old %llx new %llx\n", |
d555c333 | 2330 | spte_to_pfn(*sptep), pfn); |
c3707958 | 2331 | drop_spte(vcpu->kvm, sptep); |
91546356 | 2332 | kvm_flush_remote_tlbs(vcpu->kvm); |
6bed6b9e JR |
2333 | } else |
2334 | was_rmapped = 1; | |
1e73f9dd | 2335 | } |
852e3c19 | 2336 | |
d555c333 | 2337 | if (set_spte(vcpu, sptep, pte_access, user_fault, write_fault, |
640d9b0d | 2338 | level, gfn, pfn, speculative, true, |
9bdbba13 | 2339 | host_writable)) { |
1e73f9dd | 2340 | if (write_fault) |
b90a0e6c | 2341 | *emulate = 1; |
5304efde | 2342 | kvm_mmu_flush_tlb(vcpu); |
a378b4e6 | 2343 | } |
1e73f9dd | 2344 | |
ce88decf XG |
2345 | if (unlikely(is_mmio_spte(*sptep) && emulate)) |
2346 | *emulate = 1; | |
2347 | ||
d555c333 | 2348 | pgprintk("%s: setting spte %llx\n", __func__, *sptep); |
9ad17b10 | 2349 | pgprintk("instantiating %s PTE (%s) at %llx (%llx) addr %p\n", |
d555c333 | 2350 | is_large_pte(*sptep)? "2MB" : "4kB", |
a205bc19 JR |
2351 | *sptep & PT_PRESENT_MASK ?"RW":"R", gfn, |
2352 | *sptep, sptep); | |
d555c333 | 2353 | if (!was_rmapped && is_large_pte(*sptep)) |
05da4558 MT |
2354 | ++vcpu->kvm->stat.lpages; |
2355 | ||
ffb61bb3 XG |
2356 | if (is_shadow_present_pte(*sptep)) { |
2357 | page_header_update_slot(vcpu->kvm, sptep, gfn); | |
2358 | if (!was_rmapped) { | |
2359 | rmap_count = rmap_add(vcpu, sptep, gfn); | |
2360 | if (rmap_count > RMAP_RECYCLE_THRESHOLD) | |
2361 | rmap_recycle(vcpu, sptep, gfn); | |
2362 | } | |
1c4f1fd6 | 2363 | } |
9ed5520d | 2364 | kvm_release_pfn_clean(pfn); |
1c4f1fd6 AK |
2365 | } |
2366 | ||
6aa8b732 AK |
2367 | static void nonpaging_new_cr3(struct kvm_vcpu *vcpu) |
2368 | { | |
2369 | } | |
2370 | ||
957ed9ef XG |
2371 | static pfn_t pte_prefetch_gfn_to_pfn(struct kvm_vcpu *vcpu, gfn_t gfn, |
2372 | bool no_dirty_log) | |
2373 | { | |
2374 | struct kvm_memory_slot *slot; | |
2375 | unsigned long hva; | |
2376 | ||
5d163b1c | 2377 | slot = gfn_to_memslot_dirty_bitmap(vcpu, gfn, no_dirty_log); |
957ed9ef | 2378 | if (!slot) { |
fce92dce XG |
2379 | get_page(fault_page); |
2380 | return page_to_pfn(fault_page); | |
957ed9ef XG |
2381 | } |
2382 | ||
2383 | hva = gfn_to_hva_memslot(slot, gfn); | |
2384 | ||
2385 | return hva_to_pfn_atomic(vcpu->kvm, hva); | |
2386 | } | |
2387 | ||
2388 | static int direct_pte_prefetch_many(struct kvm_vcpu *vcpu, | |
2389 | struct kvm_mmu_page *sp, | |
2390 | u64 *start, u64 *end) | |
2391 | { | |
2392 | struct page *pages[PTE_PREFETCH_NUM]; | |
2393 | unsigned access = sp->role.access; | |
2394 | int i, ret; | |
2395 | gfn_t gfn; | |
2396 | ||
2397 | gfn = kvm_mmu_page_get_gfn(sp, start - sp->spt); | |
5d163b1c | 2398 | if (!gfn_to_memslot_dirty_bitmap(vcpu, gfn, access & ACC_WRITE_MASK)) |
957ed9ef XG |
2399 | return -1; |
2400 | ||
2401 | ret = gfn_to_page_many_atomic(vcpu->kvm, gfn, pages, end - start); | |
2402 | if (ret <= 0) | |
2403 | return -1; | |
2404 | ||
2405 | for (i = 0; i < ret; i++, gfn++, start++) | |
2406 | mmu_set_spte(vcpu, start, ACC_ALL, | |
640d9b0d | 2407 | access, 0, 0, NULL, |
957ed9ef XG |
2408 | sp->role.level, gfn, |
2409 | page_to_pfn(pages[i]), true, true); | |
2410 | ||
2411 | return 0; | |
2412 | } | |
2413 | ||
2414 | static void __direct_pte_prefetch(struct kvm_vcpu *vcpu, | |
2415 | struct kvm_mmu_page *sp, u64 *sptep) | |
2416 | { | |
2417 | u64 *spte, *start = NULL; | |
2418 | int i; | |
2419 | ||
2420 | WARN_ON(!sp->role.direct); | |
2421 | ||
2422 | i = (sptep - sp->spt) & ~(PTE_PREFETCH_NUM - 1); | |
2423 | spte = sp->spt + i; | |
2424 | ||
2425 | for (i = 0; i < PTE_PREFETCH_NUM; i++, spte++) { | |
c3707958 | 2426 | if (is_shadow_present_pte(*spte) || spte == sptep) { |
957ed9ef XG |
2427 | if (!start) |
2428 | continue; | |
2429 | if (direct_pte_prefetch_many(vcpu, sp, start, spte) < 0) | |
2430 | break; | |
2431 | start = NULL; | |
2432 | } else if (!start) | |
2433 | start = spte; | |
2434 | } | |
2435 | } | |
2436 | ||
2437 | static void direct_pte_prefetch(struct kvm_vcpu *vcpu, u64 *sptep) | |
2438 | { | |
2439 | struct kvm_mmu_page *sp; | |
2440 | ||
2441 | /* | |
2442 | * Since it's no accessed bit on EPT, it's no way to | |
2443 | * distinguish between actually accessed translations | |
2444 | * and prefetched, so disable pte prefetch if EPT is | |
2445 | * enabled. | |
2446 | */ | |
2447 | if (!shadow_accessed_mask) | |
2448 | return; | |
2449 | ||
2450 | sp = page_header(__pa(sptep)); | |
2451 | if (sp->role.level > PT_PAGE_TABLE_LEVEL) | |
2452 | return; | |
2453 | ||
2454 | __direct_pte_prefetch(vcpu, sp, sptep); | |
2455 | } | |
2456 | ||
9f652d21 | 2457 | static int __direct_map(struct kvm_vcpu *vcpu, gpa_t v, int write, |
2ec4739d XG |
2458 | int map_writable, int level, gfn_t gfn, pfn_t pfn, |
2459 | bool prefault) | |
140754bc | 2460 | { |
9f652d21 | 2461 | struct kvm_shadow_walk_iterator iterator; |
140754bc | 2462 | struct kvm_mmu_page *sp; |
b90a0e6c | 2463 | int emulate = 0; |
140754bc | 2464 | gfn_t pseudo_gfn; |
6aa8b732 | 2465 | |
9f652d21 | 2466 | for_each_shadow_entry(vcpu, (u64)gfn << PAGE_SHIFT, iterator) { |
852e3c19 | 2467 | if (iterator.level == level) { |
612819c3 MT |
2468 | unsigned pte_access = ACC_ALL; |
2469 | ||
612819c3 | 2470 | mmu_set_spte(vcpu, iterator.sptep, ACC_ALL, pte_access, |
b90a0e6c | 2471 | 0, write, &emulate, |
2ec4739d | 2472 | level, gfn, pfn, prefault, map_writable); |
957ed9ef | 2473 | direct_pte_prefetch(vcpu, iterator.sptep); |
9f652d21 AK |
2474 | ++vcpu->stat.pf_fixed; |
2475 | break; | |
6aa8b732 AK |
2476 | } |
2477 | ||
c3707958 | 2478 | if (!is_shadow_present_pte(*iterator.sptep)) { |
c9fa0b3b LJ |
2479 | u64 base_addr = iterator.addr; |
2480 | ||
2481 | base_addr &= PT64_LVL_ADDR_MASK(iterator.level); | |
2482 | pseudo_gfn = base_addr >> PAGE_SHIFT; | |
9f652d21 AK |
2483 | sp = kvm_mmu_get_page(vcpu, pseudo_gfn, iterator.addr, |
2484 | iterator.level - 1, | |
2485 | 1, ACC_ALL, iterator.sptep); | |
2486 | if (!sp) { | |
2487 | pgprintk("nonpaging_map: ENOMEM\n"); | |
2488 | kvm_release_pfn_clean(pfn); | |
2489 | return -ENOMEM; | |
2490 | } | |
140754bc | 2491 | |
1df9f2dc XG |
2492 | mmu_spte_set(iterator.sptep, |
2493 | __pa(sp->spt) | |
2494 | | PT_PRESENT_MASK | PT_WRITABLE_MASK | |
2495 | | shadow_user_mask | shadow_x_mask | |
2496 | | shadow_accessed_mask); | |
9f652d21 AK |
2497 | } |
2498 | } | |
b90a0e6c | 2499 | return emulate; |
6aa8b732 AK |
2500 | } |
2501 | ||
77db5cbd | 2502 | static void kvm_send_hwpoison_signal(unsigned long address, struct task_struct *tsk) |
bf998156 | 2503 | { |
77db5cbd HY |
2504 | siginfo_t info; |
2505 | ||
2506 | info.si_signo = SIGBUS; | |
2507 | info.si_errno = 0; | |
2508 | info.si_code = BUS_MCEERR_AR; | |
2509 | info.si_addr = (void __user *)address; | |
2510 | info.si_addr_lsb = PAGE_SHIFT; | |
bf998156 | 2511 | |
77db5cbd | 2512 | send_sig_info(SIGBUS, &info, tsk); |
bf998156 HY |
2513 | } |
2514 | ||
d7c55201 | 2515 | static int kvm_handle_bad_page(struct kvm_vcpu *vcpu, gfn_t gfn, pfn_t pfn) |
bf998156 HY |
2516 | { |
2517 | kvm_release_pfn_clean(pfn); | |
2518 | if (is_hwpoison_pfn(pfn)) { | |
bebb106a | 2519 | kvm_send_hwpoison_signal(gfn_to_hva(vcpu->kvm, gfn), current); |
bf998156 | 2520 | return 0; |
d7c55201 | 2521 | } |
edba23e5 | 2522 | |
d7c55201 | 2523 | return -EFAULT; |
bf998156 HY |
2524 | } |
2525 | ||
936a5fe6 AA |
2526 | static void transparent_hugepage_adjust(struct kvm_vcpu *vcpu, |
2527 | gfn_t *gfnp, pfn_t *pfnp, int *levelp) | |
2528 | { | |
2529 | pfn_t pfn = *pfnp; | |
2530 | gfn_t gfn = *gfnp; | |
2531 | int level = *levelp; | |
2532 | ||
2533 | /* | |
2534 | * Check if it's a transparent hugepage. If this would be an | |
2535 | * hugetlbfs page, level wouldn't be set to | |
2536 | * PT_PAGE_TABLE_LEVEL and there would be no adjustment done | |
2537 | * here. | |
2538 | */ | |
2539 | if (!is_error_pfn(pfn) && !kvm_is_mmio_pfn(pfn) && | |
2540 | level == PT_PAGE_TABLE_LEVEL && | |
2541 | PageTransCompound(pfn_to_page(pfn)) && | |
2542 | !has_wrprotected_page(vcpu->kvm, gfn, PT_DIRECTORY_LEVEL)) { | |
2543 | unsigned long mask; | |
2544 | /* | |
2545 | * mmu_notifier_retry was successful and we hold the | |
2546 | * mmu_lock here, so the pmd can't become splitting | |
2547 | * from under us, and in turn | |
2548 | * __split_huge_page_refcount() can't run from under | |
2549 | * us and we can safely transfer the refcount from | |
2550 | * PG_tail to PG_head as we switch the pfn to tail to | |
2551 | * head. | |
2552 | */ | |
2553 | *levelp = level = PT_DIRECTORY_LEVEL; | |
2554 | mask = KVM_PAGES_PER_HPAGE(level) - 1; | |
2555 | VM_BUG_ON((gfn & mask) != (pfn & mask)); | |
2556 | if (pfn & mask) { | |
2557 | gfn &= ~mask; | |
2558 | *gfnp = gfn; | |
2559 | kvm_release_pfn_clean(pfn); | |
2560 | pfn &= ~mask; | |
2561 | if (!get_page_unless_zero(pfn_to_page(pfn))) | |
2562 | BUG(); | |
2563 | *pfnp = pfn; | |
2564 | } | |
2565 | } | |
2566 | } | |
2567 | ||
d7c55201 XG |
2568 | static bool mmu_invalid_pfn(pfn_t pfn) |
2569 | { | |
ce88decf | 2570 | return unlikely(is_invalid_pfn(pfn)); |
d7c55201 XG |
2571 | } |
2572 | ||
2573 | static bool handle_abnormal_pfn(struct kvm_vcpu *vcpu, gva_t gva, gfn_t gfn, | |
2574 | pfn_t pfn, unsigned access, int *ret_val) | |
2575 | { | |
2576 | bool ret = true; | |
2577 | ||
2578 | /* The pfn is invalid, report the error! */ | |
2579 | if (unlikely(is_invalid_pfn(pfn))) { | |
2580 | *ret_val = kvm_handle_bad_page(vcpu, gfn, pfn); | |
2581 | goto exit; | |
2582 | } | |
2583 | ||
ce88decf | 2584 | if (unlikely(is_noslot_pfn(pfn))) |
d7c55201 | 2585 | vcpu_cache_mmio_info(vcpu, gva, gfn, access); |
d7c55201 XG |
2586 | |
2587 | ret = false; | |
2588 | exit: | |
2589 | return ret; | |
2590 | } | |
2591 | ||
78b2c54a | 2592 | static bool try_async_pf(struct kvm_vcpu *vcpu, bool prefault, gfn_t gfn, |
060c2abe XG |
2593 | gva_t gva, pfn_t *pfn, bool write, bool *writable); |
2594 | ||
2595 | static int nonpaging_map(struct kvm_vcpu *vcpu, gva_t v, int write, gfn_t gfn, | |
78b2c54a | 2596 | bool prefault) |
10589a46 MT |
2597 | { |
2598 | int r; | |
852e3c19 | 2599 | int level; |
936a5fe6 | 2600 | int force_pt_level; |
35149e21 | 2601 | pfn_t pfn; |
e930bffe | 2602 | unsigned long mmu_seq; |
612819c3 | 2603 | bool map_writable; |
aaee2c94 | 2604 | |
936a5fe6 AA |
2605 | force_pt_level = mapping_level_dirty_bitmap(vcpu, gfn); |
2606 | if (likely(!force_pt_level)) { | |
2607 | level = mapping_level(vcpu, gfn); | |
2608 | /* | |
2609 | * This path builds a PAE pagetable - so we can map | |
2610 | * 2mb pages at maximum. Therefore check if the level | |
2611 | * is larger than that. | |
2612 | */ | |
2613 | if (level > PT_DIRECTORY_LEVEL) | |
2614 | level = PT_DIRECTORY_LEVEL; | |
852e3c19 | 2615 | |
936a5fe6 AA |
2616 | gfn &= ~(KVM_PAGES_PER_HPAGE(level) - 1); |
2617 | } else | |
2618 | level = PT_PAGE_TABLE_LEVEL; | |
05da4558 | 2619 | |
e930bffe | 2620 | mmu_seq = vcpu->kvm->mmu_notifier_seq; |
4c2155ce | 2621 | smp_rmb(); |
060c2abe | 2622 | |
78b2c54a | 2623 | if (try_async_pf(vcpu, prefault, gfn, v, &pfn, write, &map_writable)) |
060c2abe | 2624 | return 0; |
aaee2c94 | 2625 | |
d7c55201 XG |
2626 | if (handle_abnormal_pfn(vcpu, v, gfn, pfn, ACC_ALL, &r)) |
2627 | return r; | |
d196e343 | 2628 | |
aaee2c94 | 2629 | spin_lock(&vcpu->kvm->mmu_lock); |
e930bffe AA |
2630 | if (mmu_notifier_retry(vcpu, mmu_seq)) |
2631 | goto out_unlock; | |
eb787d10 | 2632 | kvm_mmu_free_some_pages(vcpu); |
936a5fe6 AA |
2633 | if (likely(!force_pt_level)) |
2634 | transparent_hugepage_adjust(vcpu, &gfn, &pfn, &level); | |
2ec4739d XG |
2635 | r = __direct_map(vcpu, v, write, map_writable, level, gfn, pfn, |
2636 | prefault); | |
aaee2c94 MT |
2637 | spin_unlock(&vcpu->kvm->mmu_lock); |
2638 | ||
aaee2c94 | 2639 | |
10589a46 | 2640 | return r; |
e930bffe AA |
2641 | |
2642 | out_unlock: | |
2643 | spin_unlock(&vcpu->kvm->mmu_lock); | |
2644 | kvm_release_pfn_clean(pfn); | |
2645 | return 0; | |
10589a46 MT |
2646 | } |
2647 | ||
2648 | ||
17ac10ad AK |
2649 | static void mmu_free_roots(struct kvm_vcpu *vcpu) |
2650 | { | |
2651 | int i; | |
4db35314 | 2652 | struct kvm_mmu_page *sp; |
d98ba053 | 2653 | LIST_HEAD(invalid_list); |
17ac10ad | 2654 | |
ad312c7c | 2655 | if (!VALID_PAGE(vcpu->arch.mmu.root_hpa)) |
7b53aa56 | 2656 | return; |
aaee2c94 | 2657 | spin_lock(&vcpu->kvm->mmu_lock); |
81407ca5 JR |
2658 | if (vcpu->arch.mmu.shadow_root_level == PT64_ROOT_LEVEL && |
2659 | (vcpu->arch.mmu.root_level == PT64_ROOT_LEVEL || | |
2660 | vcpu->arch.mmu.direct_map)) { | |
ad312c7c | 2661 | hpa_t root = vcpu->arch.mmu.root_hpa; |
17ac10ad | 2662 | |
4db35314 AK |
2663 | sp = page_header(root); |
2664 | --sp->root_count; | |
d98ba053 XG |
2665 | if (!sp->root_count && sp->role.invalid) { |
2666 | kvm_mmu_prepare_zap_page(vcpu->kvm, sp, &invalid_list); | |
2667 | kvm_mmu_commit_zap_page(vcpu->kvm, &invalid_list); | |
2668 | } | |
ad312c7c | 2669 | vcpu->arch.mmu.root_hpa = INVALID_PAGE; |
aaee2c94 | 2670 | spin_unlock(&vcpu->kvm->mmu_lock); |
17ac10ad AK |
2671 | return; |
2672 | } | |
17ac10ad | 2673 | for (i = 0; i < 4; ++i) { |
ad312c7c | 2674 | hpa_t root = vcpu->arch.mmu.pae_root[i]; |
17ac10ad | 2675 | |
417726a3 | 2676 | if (root) { |
417726a3 | 2677 | root &= PT64_BASE_ADDR_MASK; |
4db35314 AK |
2678 | sp = page_header(root); |
2679 | --sp->root_count; | |
2e53d63a | 2680 | if (!sp->root_count && sp->role.invalid) |
d98ba053 XG |
2681 | kvm_mmu_prepare_zap_page(vcpu->kvm, sp, |
2682 | &invalid_list); | |
417726a3 | 2683 | } |
ad312c7c | 2684 | vcpu->arch.mmu.pae_root[i] = INVALID_PAGE; |
17ac10ad | 2685 | } |
d98ba053 | 2686 | kvm_mmu_commit_zap_page(vcpu->kvm, &invalid_list); |
aaee2c94 | 2687 | spin_unlock(&vcpu->kvm->mmu_lock); |
ad312c7c | 2688 | vcpu->arch.mmu.root_hpa = INVALID_PAGE; |
17ac10ad AK |
2689 | } |
2690 | ||
8986ecc0 MT |
2691 | static int mmu_check_root(struct kvm_vcpu *vcpu, gfn_t root_gfn) |
2692 | { | |
2693 | int ret = 0; | |
2694 | ||
2695 | if (!kvm_is_visible_gfn(vcpu->kvm, root_gfn)) { | |
a8eeb04a | 2696 | kvm_make_request(KVM_REQ_TRIPLE_FAULT, vcpu); |
8986ecc0 MT |
2697 | ret = 1; |
2698 | } | |
2699 | ||
2700 | return ret; | |
2701 | } | |
2702 | ||
651dd37a JR |
2703 | static int mmu_alloc_direct_roots(struct kvm_vcpu *vcpu) |
2704 | { | |
2705 | struct kvm_mmu_page *sp; | |
7ebaf15e | 2706 | unsigned i; |
651dd37a JR |
2707 | |
2708 | if (vcpu->arch.mmu.shadow_root_level == PT64_ROOT_LEVEL) { | |
2709 | spin_lock(&vcpu->kvm->mmu_lock); | |
2710 | kvm_mmu_free_some_pages(vcpu); | |
2711 | sp = kvm_mmu_get_page(vcpu, 0, 0, PT64_ROOT_LEVEL, | |
2712 | 1, ACC_ALL, NULL); | |
2713 | ++sp->root_count; | |
2714 | spin_unlock(&vcpu->kvm->mmu_lock); | |
2715 | vcpu->arch.mmu.root_hpa = __pa(sp->spt); | |
2716 | } else if (vcpu->arch.mmu.shadow_root_level == PT32E_ROOT_LEVEL) { | |
2717 | for (i = 0; i < 4; ++i) { | |
2718 | hpa_t root = vcpu->arch.mmu.pae_root[i]; | |
2719 | ||
2720 | ASSERT(!VALID_PAGE(root)); | |
2721 | spin_lock(&vcpu->kvm->mmu_lock); | |
2722 | kvm_mmu_free_some_pages(vcpu); | |
649497d1 AK |
2723 | sp = kvm_mmu_get_page(vcpu, i << (30 - PAGE_SHIFT), |
2724 | i << 30, | |
651dd37a JR |
2725 | PT32_ROOT_LEVEL, 1, ACC_ALL, |
2726 | NULL); | |
2727 | root = __pa(sp->spt); | |
2728 | ++sp->root_count; | |
2729 | spin_unlock(&vcpu->kvm->mmu_lock); | |
2730 | vcpu->arch.mmu.pae_root[i] = root | PT_PRESENT_MASK; | |
651dd37a | 2731 | } |
6292757f | 2732 | vcpu->arch.mmu.root_hpa = __pa(vcpu->arch.mmu.pae_root); |
651dd37a JR |
2733 | } else |
2734 | BUG(); | |
2735 | ||
2736 | return 0; | |
2737 | } | |
2738 | ||
2739 | static int mmu_alloc_shadow_roots(struct kvm_vcpu *vcpu) | |
17ac10ad | 2740 | { |
4db35314 | 2741 | struct kvm_mmu_page *sp; |
81407ca5 JR |
2742 | u64 pdptr, pm_mask; |
2743 | gfn_t root_gfn; | |
2744 | int i; | |
3bb65a22 | 2745 | |
5777ed34 | 2746 | root_gfn = vcpu->arch.mmu.get_cr3(vcpu) >> PAGE_SHIFT; |
17ac10ad | 2747 | |
651dd37a JR |
2748 | if (mmu_check_root(vcpu, root_gfn)) |
2749 | return 1; | |
2750 | ||
2751 | /* | |
2752 | * Do we shadow a long mode page table? If so we need to | |
2753 | * write-protect the guests page table root. | |
2754 | */ | |
2755 | if (vcpu->arch.mmu.root_level == PT64_ROOT_LEVEL) { | |
ad312c7c | 2756 | hpa_t root = vcpu->arch.mmu.root_hpa; |
17ac10ad AK |
2757 | |
2758 | ASSERT(!VALID_PAGE(root)); | |
651dd37a | 2759 | |
8facbbff | 2760 | spin_lock(&vcpu->kvm->mmu_lock); |
24955b6c | 2761 | kvm_mmu_free_some_pages(vcpu); |
651dd37a JR |
2762 | sp = kvm_mmu_get_page(vcpu, root_gfn, 0, PT64_ROOT_LEVEL, |
2763 | 0, ACC_ALL, NULL); | |
4db35314 AK |
2764 | root = __pa(sp->spt); |
2765 | ++sp->root_count; | |
8facbbff | 2766 | spin_unlock(&vcpu->kvm->mmu_lock); |
ad312c7c | 2767 | vcpu->arch.mmu.root_hpa = root; |
8986ecc0 | 2768 | return 0; |
17ac10ad | 2769 | } |
f87f9288 | 2770 | |
651dd37a JR |
2771 | /* |
2772 | * We shadow a 32 bit page table. This may be a legacy 2-level | |
81407ca5 JR |
2773 | * or a PAE 3-level page table. In either case we need to be aware that |
2774 | * the shadow page table may be a PAE or a long mode page table. | |
651dd37a | 2775 | */ |
81407ca5 JR |
2776 | pm_mask = PT_PRESENT_MASK; |
2777 | if (vcpu->arch.mmu.shadow_root_level == PT64_ROOT_LEVEL) | |
2778 | pm_mask |= PT_ACCESSED_MASK | PT_WRITABLE_MASK | PT_USER_MASK; | |
2779 | ||
17ac10ad | 2780 | for (i = 0; i < 4; ++i) { |
ad312c7c | 2781 | hpa_t root = vcpu->arch.mmu.pae_root[i]; |
17ac10ad AK |
2782 | |
2783 | ASSERT(!VALID_PAGE(root)); | |
ad312c7c | 2784 | if (vcpu->arch.mmu.root_level == PT32E_ROOT_LEVEL) { |
e4e517b4 | 2785 | pdptr = vcpu->arch.mmu.get_pdptr(vcpu, i); |
43a3795a | 2786 | if (!is_present_gpte(pdptr)) { |
ad312c7c | 2787 | vcpu->arch.mmu.pae_root[i] = 0; |
417726a3 AK |
2788 | continue; |
2789 | } | |
6de4f3ad | 2790 | root_gfn = pdptr >> PAGE_SHIFT; |
f87f9288 JR |
2791 | if (mmu_check_root(vcpu, root_gfn)) |
2792 | return 1; | |
5a7388c2 | 2793 | } |
8facbbff | 2794 | spin_lock(&vcpu->kvm->mmu_lock); |
24955b6c | 2795 | kvm_mmu_free_some_pages(vcpu); |
4db35314 | 2796 | sp = kvm_mmu_get_page(vcpu, root_gfn, i << 30, |
651dd37a | 2797 | PT32_ROOT_LEVEL, 0, |
f7d9c7b7 | 2798 | ACC_ALL, NULL); |
4db35314 AK |
2799 | root = __pa(sp->spt); |
2800 | ++sp->root_count; | |
8facbbff AK |
2801 | spin_unlock(&vcpu->kvm->mmu_lock); |
2802 | ||
81407ca5 | 2803 | vcpu->arch.mmu.pae_root[i] = root | pm_mask; |
17ac10ad | 2804 | } |
6292757f | 2805 | vcpu->arch.mmu.root_hpa = __pa(vcpu->arch.mmu.pae_root); |
81407ca5 JR |
2806 | |
2807 | /* | |
2808 | * If we shadow a 32 bit page table with a long mode page | |
2809 | * table we enter this path. | |
2810 | */ | |
2811 | if (vcpu->arch.mmu.shadow_root_level == PT64_ROOT_LEVEL) { | |
2812 | if (vcpu->arch.mmu.lm_root == NULL) { | |
2813 | /* | |
2814 | * The additional page necessary for this is only | |
2815 | * allocated on demand. | |
2816 | */ | |
2817 | ||
2818 | u64 *lm_root; | |
2819 | ||
2820 | lm_root = (void*)get_zeroed_page(GFP_KERNEL); | |
2821 | if (lm_root == NULL) | |
2822 | return 1; | |
2823 | ||
2824 | lm_root[0] = __pa(vcpu->arch.mmu.pae_root) | pm_mask; | |
2825 | ||
2826 | vcpu->arch.mmu.lm_root = lm_root; | |
2827 | } | |
2828 | ||
2829 | vcpu->arch.mmu.root_hpa = __pa(vcpu->arch.mmu.lm_root); | |
2830 | } | |
2831 | ||
8986ecc0 | 2832 | return 0; |
17ac10ad AK |
2833 | } |
2834 | ||
651dd37a JR |
2835 | static int mmu_alloc_roots(struct kvm_vcpu *vcpu) |
2836 | { | |
2837 | if (vcpu->arch.mmu.direct_map) | |
2838 | return mmu_alloc_direct_roots(vcpu); | |
2839 | else | |
2840 | return mmu_alloc_shadow_roots(vcpu); | |
2841 | } | |
2842 | ||
0ba73cda MT |
2843 | static void mmu_sync_roots(struct kvm_vcpu *vcpu) |
2844 | { | |
2845 | int i; | |
2846 | struct kvm_mmu_page *sp; | |
2847 | ||
81407ca5 JR |
2848 | if (vcpu->arch.mmu.direct_map) |
2849 | return; | |
2850 | ||
0ba73cda MT |
2851 | if (!VALID_PAGE(vcpu->arch.mmu.root_hpa)) |
2852 | return; | |
6903074c | 2853 | |
bebb106a | 2854 | vcpu_clear_mmio_info(vcpu, ~0ul); |
6903074c | 2855 | trace_kvm_mmu_audit(vcpu, AUDIT_PRE_SYNC); |
81407ca5 | 2856 | if (vcpu->arch.mmu.root_level == PT64_ROOT_LEVEL) { |
0ba73cda MT |
2857 | hpa_t root = vcpu->arch.mmu.root_hpa; |
2858 | sp = page_header(root); | |
2859 | mmu_sync_children(vcpu, sp); | |
5054c0de | 2860 | trace_kvm_mmu_audit(vcpu, AUDIT_POST_SYNC); |
0ba73cda MT |
2861 | return; |
2862 | } | |
2863 | for (i = 0; i < 4; ++i) { | |
2864 | hpa_t root = vcpu->arch.mmu.pae_root[i]; | |
2865 | ||
8986ecc0 | 2866 | if (root && VALID_PAGE(root)) { |
0ba73cda MT |
2867 | root &= PT64_BASE_ADDR_MASK; |
2868 | sp = page_header(root); | |
2869 | mmu_sync_children(vcpu, sp); | |
2870 | } | |
2871 | } | |
6903074c | 2872 | trace_kvm_mmu_audit(vcpu, AUDIT_POST_SYNC); |
0ba73cda MT |
2873 | } |
2874 | ||
2875 | void kvm_mmu_sync_roots(struct kvm_vcpu *vcpu) | |
2876 | { | |
2877 | spin_lock(&vcpu->kvm->mmu_lock); | |
2878 | mmu_sync_roots(vcpu); | |
6cffe8ca | 2879 | spin_unlock(&vcpu->kvm->mmu_lock); |
0ba73cda MT |
2880 | } |
2881 | ||
1871c602 | 2882 | static gpa_t nonpaging_gva_to_gpa(struct kvm_vcpu *vcpu, gva_t vaddr, |
ab9ae313 | 2883 | u32 access, struct x86_exception *exception) |
6aa8b732 | 2884 | { |
ab9ae313 AK |
2885 | if (exception) |
2886 | exception->error_code = 0; | |
6aa8b732 AK |
2887 | return vaddr; |
2888 | } | |
2889 | ||
6539e738 | 2890 | static gpa_t nonpaging_gva_to_gpa_nested(struct kvm_vcpu *vcpu, gva_t vaddr, |
ab9ae313 AK |
2891 | u32 access, |
2892 | struct x86_exception *exception) | |
6539e738 | 2893 | { |
ab9ae313 AK |
2894 | if (exception) |
2895 | exception->error_code = 0; | |
6539e738 JR |
2896 | return vcpu->arch.nested_mmu.translate_gpa(vcpu, vaddr, access); |
2897 | } | |
2898 | ||
ce88decf XG |
2899 | static bool quickly_check_mmio_pf(struct kvm_vcpu *vcpu, u64 addr, bool direct) |
2900 | { | |
2901 | if (direct) | |
2902 | return vcpu_match_mmio_gpa(vcpu, addr); | |
2903 | ||
2904 | return vcpu_match_mmio_gva(vcpu, addr); | |
2905 | } | |
2906 | ||
2907 | ||
2908 | /* | |
2909 | * On direct hosts, the last spte is only allows two states | |
2910 | * for mmio page fault: | |
2911 | * - It is the mmio spte | |
2912 | * - It is zapped or it is being zapped. | |
2913 | * | |
2914 | * This function completely checks the spte when the last spte | |
2915 | * is not the mmio spte. | |
2916 | */ | |
2917 | static bool check_direct_spte_mmio_pf(u64 spte) | |
2918 | { | |
2919 | return __check_direct_spte_mmio_pf(spte); | |
2920 | } | |
2921 | ||
2922 | static u64 walk_shadow_page_get_mmio_spte(struct kvm_vcpu *vcpu, u64 addr) | |
2923 | { | |
2924 | struct kvm_shadow_walk_iterator iterator; | |
2925 | u64 spte = 0ull; | |
2926 | ||
2927 | walk_shadow_page_lockless_begin(vcpu); | |
2928 | for_each_shadow_entry_lockless(vcpu, addr, iterator, spte) | |
2929 | if (!is_shadow_present_pte(spte)) | |
2930 | break; | |
2931 | walk_shadow_page_lockless_end(vcpu); | |
2932 | ||
2933 | return spte; | |
2934 | } | |
2935 | ||
2936 | /* | |
2937 | * If it is a real mmio page fault, return 1 and emulat the instruction | |
2938 | * directly, return 0 to let CPU fault again on the address, -1 is | |
2939 | * returned if bug is detected. | |
2940 | */ | |
2941 | int handle_mmio_page_fault_common(struct kvm_vcpu *vcpu, u64 addr, bool direct) | |
2942 | { | |
2943 | u64 spte; | |
2944 | ||
2945 | if (quickly_check_mmio_pf(vcpu, addr, direct)) | |
2946 | return 1; | |
2947 | ||
2948 | spte = walk_shadow_page_get_mmio_spte(vcpu, addr); | |
2949 | ||
2950 | if (is_mmio_spte(spte)) { | |
2951 | gfn_t gfn = get_mmio_spte_gfn(spte); | |
2952 | unsigned access = get_mmio_spte_access(spte); | |
2953 | ||
2954 | if (direct) | |
2955 | addr = 0; | |
4f022648 XG |
2956 | |
2957 | trace_handle_mmio_page_fault(addr, gfn, access); | |
ce88decf XG |
2958 | vcpu_cache_mmio_info(vcpu, addr, gfn, access); |
2959 | return 1; | |
2960 | } | |
2961 | ||
2962 | /* | |
2963 | * It's ok if the gva is remapped by other cpus on shadow guest, | |
2964 | * it's a BUG if the gfn is not a mmio page. | |
2965 | */ | |
2966 | if (direct && !check_direct_spte_mmio_pf(spte)) | |
2967 | return -1; | |
2968 | ||
2969 | /* | |
2970 | * If the page table is zapped by other cpus, let CPU fault again on | |
2971 | * the address. | |
2972 | */ | |
2973 | return 0; | |
2974 | } | |
2975 | EXPORT_SYMBOL_GPL(handle_mmio_page_fault_common); | |
2976 | ||
2977 | static int handle_mmio_page_fault(struct kvm_vcpu *vcpu, u64 addr, | |
2978 | u32 error_code, bool direct) | |
2979 | { | |
2980 | int ret; | |
2981 | ||
2982 | ret = handle_mmio_page_fault_common(vcpu, addr, direct); | |
2983 | WARN_ON(ret < 0); | |
2984 | return ret; | |
2985 | } | |
2986 | ||
6aa8b732 | 2987 | static int nonpaging_page_fault(struct kvm_vcpu *vcpu, gva_t gva, |
78b2c54a | 2988 | u32 error_code, bool prefault) |
6aa8b732 | 2989 | { |
e833240f | 2990 | gfn_t gfn; |
e2dec939 | 2991 | int r; |
6aa8b732 | 2992 | |
b8688d51 | 2993 | pgprintk("%s: gva %lx error %x\n", __func__, gva, error_code); |
ce88decf XG |
2994 | |
2995 | if (unlikely(error_code & PFERR_RSVD_MASK)) | |
2996 | return handle_mmio_page_fault(vcpu, gva, error_code, true); | |
2997 | ||
e2dec939 AK |
2998 | r = mmu_topup_memory_caches(vcpu); |
2999 | if (r) | |
3000 | return r; | |
714b93da | 3001 | |
6aa8b732 | 3002 | ASSERT(vcpu); |
ad312c7c | 3003 | ASSERT(VALID_PAGE(vcpu->arch.mmu.root_hpa)); |
6aa8b732 | 3004 | |
e833240f | 3005 | gfn = gva >> PAGE_SHIFT; |
6aa8b732 | 3006 | |
e833240f | 3007 | return nonpaging_map(vcpu, gva & PAGE_MASK, |
78b2c54a | 3008 | error_code & PFERR_WRITE_MASK, gfn, prefault); |
6aa8b732 AK |
3009 | } |
3010 | ||
7e1fbeac | 3011 | static int kvm_arch_setup_async_pf(struct kvm_vcpu *vcpu, gva_t gva, gfn_t gfn) |
af585b92 GN |
3012 | { |
3013 | struct kvm_arch_async_pf arch; | |
fb67e14f | 3014 | |
7c90705b | 3015 | arch.token = (vcpu->arch.apf.id++ << 12) | vcpu->vcpu_id; |
af585b92 | 3016 | arch.gfn = gfn; |
c4806acd | 3017 | arch.direct_map = vcpu->arch.mmu.direct_map; |
fb67e14f | 3018 | arch.cr3 = vcpu->arch.mmu.get_cr3(vcpu); |
af585b92 GN |
3019 | |
3020 | return kvm_setup_async_pf(vcpu, gva, gfn, &arch); | |
3021 | } | |
3022 | ||
3023 | static bool can_do_async_pf(struct kvm_vcpu *vcpu) | |
3024 | { | |
3025 | if (unlikely(!irqchip_in_kernel(vcpu->kvm) || | |
3026 | kvm_event_needs_reinjection(vcpu))) | |
3027 | return false; | |
3028 | ||
3029 | return kvm_x86_ops->interrupt_allowed(vcpu); | |
3030 | } | |
3031 | ||
78b2c54a | 3032 | static bool try_async_pf(struct kvm_vcpu *vcpu, bool prefault, gfn_t gfn, |
612819c3 | 3033 | gva_t gva, pfn_t *pfn, bool write, bool *writable) |
af585b92 GN |
3034 | { |
3035 | bool async; | |
3036 | ||
612819c3 | 3037 | *pfn = gfn_to_pfn_async(vcpu->kvm, gfn, &async, write, writable); |
af585b92 GN |
3038 | |
3039 | if (!async) | |
3040 | return false; /* *pfn has correct page already */ | |
3041 | ||
3042 | put_page(pfn_to_page(*pfn)); | |
3043 | ||
78b2c54a | 3044 | if (!prefault && can_do_async_pf(vcpu)) { |
c9b263d2 | 3045 | trace_kvm_try_async_get_page(gva, gfn); |
af585b92 GN |
3046 | if (kvm_find_async_pf_gfn(vcpu, gfn)) { |
3047 | trace_kvm_async_pf_doublefault(gva, gfn); | |
3048 | kvm_make_request(KVM_REQ_APF_HALT, vcpu); | |
3049 | return true; | |
3050 | } else if (kvm_arch_setup_async_pf(vcpu, gva, gfn)) | |
3051 | return true; | |
3052 | } | |
3053 | ||
612819c3 | 3054 | *pfn = gfn_to_pfn_prot(vcpu->kvm, gfn, write, writable); |
af585b92 GN |
3055 | |
3056 | return false; | |
3057 | } | |
3058 | ||
56028d08 | 3059 | static int tdp_page_fault(struct kvm_vcpu *vcpu, gva_t gpa, u32 error_code, |
78b2c54a | 3060 | bool prefault) |
fb72d167 | 3061 | { |
35149e21 | 3062 | pfn_t pfn; |
fb72d167 | 3063 | int r; |
852e3c19 | 3064 | int level; |
936a5fe6 | 3065 | int force_pt_level; |
05da4558 | 3066 | gfn_t gfn = gpa >> PAGE_SHIFT; |
e930bffe | 3067 | unsigned long mmu_seq; |
612819c3 MT |
3068 | int write = error_code & PFERR_WRITE_MASK; |
3069 | bool map_writable; | |
fb72d167 JR |
3070 | |
3071 | ASSERT(vcpu); | |
3072 | ASSERT(VALID_PAGE(vcpu->arch.mmu.root_hpa)); | |
3073 | ||
ce88decf XG |
3074 | if (unlikely(error_code & PFERR_RSVD_MASK)) |
3075 | return handle_mmio_page_fault(vcpu, gpa, error_code, true); | |
3076 | ||
fb72d167 JR |
3077 | r = mmu_topup_memory_caches(vcpu); |
3078 | if (r) | |
3079 | return r; | |
3080 | ||
936a5fe6 AA |
3081 | force_pt_level = mapping_level_dirty_bitmap(vcpu, gfn); |
3082 | if (likely(!force_pt_level)) { | |
3083 | level = mapping_level(vcpu, gfn); | |
3084 | gfn &= ~(KVM_PAGES_PER_HPAGE(level) - 1); | |
3085 | } else | |
3086 | level = PT_PAGE_TABLE_LEVEL; | |
852e3c19 | 3087 | |
e930bffe | 3088 | mmu_seq = vcpu->kvm->mmu_notifier_seq; |
4c2155ce | 3089 | smp_rmb(); |
af585b92 | 3090 | |
78b2c54a | 3091 | if (try_async_pf(vcpu, prefault, gfn, gpa, &pfn, write, &map_writable)) |
af585b92 GN |
3092 | return 0; |
3093 | ||
d7c55201 XG |
3094 | if (handle_abnormal_pfn(vcpu, 0, gfn, pfn, ACC_ALL, &r)) |
3095 | return r; | |
3096 | ||
fb72d167 | 3097 | spin_lock(&vcpu->kvm->mmu_lock); |
e930bffe AA |
3098 | if (mmu_notifier_retry(vcpu, mmu_seq)) |
3099 | goto out_unlock; | |
fb72d167 | 3100 | kvm_mmu_free_some_pages(vcpu); |
936a5fe6 AA |
3101 | if (likely(!force_pt_level)) |
3102 | transparent_hugepage_adjust(vcpu, &gfn, &pfn, &level); | |
612819c3 | 3103 | r = __direct_map(vcpu, gpa, write, map_writable, |
2ec4739d | 3104 | level, gfn, pfn, prefault); |
fb72d167 | 3105 | spin_unlock(&vcpu->kvm->mmu_lock); |
fb72d167 JR |
3106 | |
3107 | return r; | |
e930bffe AA |
3108 | |
3109 | out_unlock: | |
3110 | spin_unlock(&vcpu->kvm->mmu_lock); | |
3111 | kvm_release_pfn_clean(pfn); | |
3112 | return 0; | |
fb72d167 JR |
3113 | } |
3114 | ||
6aa8b732 AK |
3115 | static void nonpaging_free(struct kvm_vcpu *vcpu) |
3116 | { | |
17ac10ad | 3117 | mmu_free_roots(vcpu); |
6aa8b732 AK |
3118 | } |
3119 | ||
52fde8df JR |
3120 | static int nonpaging_init_context(struct kvm_vcpu *vcpu, |
3121 | struct kvm_mmu *context) | |
6aa8b732 | 3122 | { |
6aa8b732 AK |
3123 | context->new_cr3 = nonpaging_new_cr3; |
3124 | context->page_fault = nonpaging_page_fault; | |
6aa8b732 AK |
3125 | context->gva_to_gpa = nonpaging_gva_to_gpa; |
3126 | context->free = nonpaging_free; | |
e8bc217a | 3127 | context->sync_page = nonpaging_sync_page; |
a7052897 | 3128 | context->invlpg = nonpaging_invlpg; |
0f53b5b1 | 3129 | context->update_pte = nonpaging_update_pte; |
cea0f0e7 | 3130 | context->root_level = 0; |
6aa8b732 | 3131 | context->shadow_root_level = PT32E_ROOT_LEVEL; |
17c3ba9d | 3132 | context->root_hpa = INVALID_PAGE; |
c5a78f2b | 3133 | context->direct_map = true; |
2d48a985 | 3134 | context->nx = false; |
6aa8b732 AK |
3135 | return 0; |
3136 | } | |
3137 | ||
d835dfec | 3138 | void kvm_mmu_flush_tlb(struct kvm_vcpu *vcpu) |
6aa8b732 | 3139 | { |
1165f5fe | 3140 | ++vcpu->stat.tlb_flush; |
a8eeb04a | 3141 | kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu); |
6aa8b732 AK |
3142 | } |
3143 | ||
3144 | static void paging_new_cr3(struct kvm_vcpu *vcpu) | |
3145 | { | |
9f8fe504 | 3146 | pgprintk("%s: cr3 %lx\n", __func__, kvm_read_cr3(vcpu)); |
cea0f0e7 | 3147 | mmu_free_roots(vcpu); |
6aa8b732 AK |
3148 | } |
3149 | ||
5777ed34 JR |
3150 | static unsigned long get_cr3(struct kvm_vcpu *vcpu) |
3151 | { | |
9f8fe504 | 3152 | return kvm_read_cr3(vcpu); |
5777ed34 JR |
3153 | } |
3154 | ||
6389ee94 AK |
3155 | static void inject_page_fault(struct kvm_vcpu *vcpu, |
3156 | struct x86_exception *fault) | |
6aa8b732 | 3157 | { |
6389ee94 | 3158 | vcpu->arch.mmu.inject_page_fault(vcpu, fault); |
6aa8b732 AK |
3159 | } |
3160 | ||
6aa8b732 AK |
3161 | static void paging_free(struct kvm_vcpu *vcpu) |
3162 | { | |
3163 | nonpaging_free(vcpu); | |
3164 | } | |
3165 | ||
3241f22d | 3166 | static bool is_rsvd_bits_set(struct kvm_mmu *mmu, u64 gpte, int level) |
82725b20 DE |
3167 | { |
3168 | int bit7; | |
3169 | ||
3170 | bit7 = (gpte >> 7) & 1; | |
3241f22d | 3171 | return (gpte & mmu->rsvd_bits_mask[bit7][level-1]) != 0; |
82725b20 DE |
3172 | } |
3173 | ||
ce88decf XG |
3174 | static bool sync_mmio_spte(u64 *sptep, gfn_t gfn, unsigned access, |
3175 | int *nr_present) | |
3176 | { | |
3177 | if (unlikely(is_mmio_spte(*sptep))) { | |
3178 | if (gfn != get_mmio_spte_gfn(*sptep)) { | |
3179 | mmu_spte_clear_no_track(sptep); | |
3180 | return true; | |
3181 | } | |
3182 | ||
3183 | (*nr_present)++; | |
3184 | mark_mmio_spte(sptep, gfn, access); | |
3185 | return true; | |
3186 | } | |
3187 | ||
3188 | return false; | |
3189 | } | |
3190 | ||
6aa8b732 AK |
3191 | #define PTTYPE 64 |
3192 | #include "paging_tmpl.h" | |
3193 | #undef PTTYPE | |
3194 | ||
3195 | #define PTTYPE 32 | |
3196 | #include "paging_tmpl.h" | |
3197 | #undef PTTYPE | |
3198 | ||
52fde8df JR |
3199 | static void reset_rsvds_bits_mask(struct kvm_vcpu *vcpu, |
3200 | struct kvm_mmu *context, | |
3201 | int level) | |
82725b20 | 3202 | { |
82725b20 DE |
3203 | int maxphyaddr = cpuid_maxphyaddr(vcpu); |
3204 | u64 exb_bit_rsvd = 0; | |
3205 | ||
2d48a985 | 3206 | if (!context->nx) |
82725b20 DE |
3207 | exb_bit_rsvd = rsvd_bits(63, 63); |
3208 | switch (level) { | |
3209 | case PT32_ROOT_LEVEL: | |
3210 | /* no rsvd bits for 2 level 4K page table entries */ | |
3211 | context->rsvd_bits_mask[0][1] = 0; | |
3212 | context->rsvd_bits_mask[0][0] = 0; | |
f815bce8 XG |
3213 | context->rsvd_bits_mask[1][0] = context->rsvd_bits_mask[0][0]; |
3214 | ||
3215 | if (!is_pse(vcpu)) { | |
3216 | context->rsvd_bits_mask[1][1] = 0; | |
3217 | break; | |
3218 | } | |
3219 | ||
82725b20 DE |
3220 | if (is_cpuid_PSE36()) |
3221 | /* 36bits PSE 4MB page */ | |
3222 | context->rsvd_bits_mask[1][1] = rsvd_bits(17, 21); | |
3223 | else | |
3224 | /* 32 bits PSE 4MB page */ | |
3225 | context->rsvd_bits_mask[1][1] = rsvd_bits(13, 21); | |
82725b20 DE |
3226 | break; |
3227 | case PT32E_ROOT_LEVEL: | |
20c466b5 DE |
3228 | context->rsvd_bits_mask[0][2] = |
3229 | rsvd_bits(maxphyaddr, 63) | | |
3230 | rsvd_bits(7, 8) | rsvd_bits(1, 2); /* PDPTE */ | |
82725b20 | 3231 | context->rsvd_bits_mask[0][1] = exb_bit_rsvd | |
4c26b4cd | 3232 | rsvd_bits(maxphyaddr, 62); /* PDE */ |
82725b20 DE |
3233 | context->rsvd_bits_mask[0][0] = exb_bit_rsvd | |
3234 | rsvd_bits(maxphyaddr, 62); /* PTE */ | |
3235 | context->rsvd_bits_mask[1][1] = exb_bit_rsvd | | |
3236 | rsvd_bits(maxphyaddr, 62) | | |
3237 | rsvd_bits(13, 20); /* large page */ | |
f815bce8 | 3238 | context->rsvd_bits_mask[1][0] = context->rsvd_bits_mask[0][0]; |
82725b20 DE |
3239 | break; |
3240 | case PT64_ROOT_LEVEL: | |
3241 | context->rsvd_bits_mask[0][3] = exb_bit_rsvd | | |
3242 | rsvd_bits(maxphyaddr, 51) | rsvd_bits(7, 8); | |
3243 | context->rsvd_bits_mask[0][2] = exb_bit_rsvd | | |
3244 | rsvd_bits(maxphyaddr, 51) | rsvd_bits(7, 8); | |
3245 | context->rsvd_bits_mask[0][1] = exb_bit_rsvd | | |
4c26b4cd | 3246 | rsvd_bits(maxphyaddr, 51); |
82725b20 DE |
3247 | context->rsvd_bits_mask[0][0] = exb_bit_rsvd | |
3248 | rsvd_bits(maxphyaddr, 51); | |
3249 | context->rsvd_bits_mask[1][3] = context->rsvd_bits_mask[0][3]; | |
e04da980 JR |
3250 | context->rsvd_bits_mask[1][2] = exb_bit_rsvd | |
3251 | rsvd_bits(maxphyaddr, 51) | | |
3252 | rsvd_bits(13, 29); | |
82725b20 | 3253 | context->rsvd_bits_mask[1][1] = exb_bit_rsvd | |
4c26b4cd SY |
3254 | rsvd_bits(maxphyaddr, 51) | |
3255 | rsvd_bits(13, 20); /* large page */ | |
f815bce8 | 3256 | context->rsvd_bits_mask[1][0] = context->rsvd_bits_mask[0][0]; |
82725b20 DE |
3257 | break; |
3258 | } | |
3259 | } | |
3260 | ||
52fde8df JR |
3261 | static int paging64_init_context_common(struct kvm_vcpu *vcpu, |
3262 | struct kvm_mmu *context, | |
3263 | int level) | |
6aa8b732 | 3264 | { |
2d48a985 JR |
3265 | context->nx = is_nx(vcpu); |
3266 | ||
52fde8df | 3267 | reset_rsvds_bits_mask(vcpu, context, level); |
6aa8b732 AK |
3268 | |
3269 | ASSERT(is_pae(vcpu)); | |
3270 | context->new_cr3 = paging_new_cr3; | |
3271 | context->page_fault = paging64_page_fault; | |
6aa8b732 | 3272 | context->gva_to_gpa = paging64_gva_to_gpa; |
e8bc217a | 3273 | context->sync_page = paging64_sync_page; |
a7052897 | 3274 | context->invlpg = paging64_invlpg; |
0f53b5b1 | 3275 | context->update_pte = paging64_update_pte; |
6aa8b732 | 3276 | context->free = paging_free; |
17ac10ad AK |
3277 | context->root_level = level; |
3278 | context->shadow_root_level = level; | |
17c3ba9d | 3279 | context->root_hpa = INVALID_PAGE; |
c5a78f2b | 3280 | context->direct_map = false; |
6aa8b732 AK |
3281 | return 0; |
3282 | } | |
3283 | ||
52fde8df JR |
3284 | static int paging64_init_context(struct kvm_vcpu *vcpu, |
3285 | struct kvm_mmu *context) | |
17ac10ad | 3286 | { |
52fde8df | 3287 | return paging64_init_context_common(vcpu, context, PT64_ROOT_LEVEL); |
17ac10ad AK |
3288 | } |
3289 | ||
52fde8df JR |
3290 | static int paging32_init_context(struct kvm_vcpu *vcpu, |
3291 | struct kvm_mmu *context) | |
6aa8b732 | 3292 | { |
2d48a985 JR |
3293 | context->nx = false; |
3294 | ||
52fde8df | 3295 | reset_rsvds_bits_mask(vcpu, context, PT32_ROOT_LEVEL); |
6aa8b732 AK |
3296 | |
3297 | context->new_cr3 = paging_new_cr3; | |
3298 | context->page_fault = paging32_page_fault; | |
6aa8b732 AK |
3299 | context->gva_to_gpa = paging32_gva_to_gpa; |
3300 | context->free = paging_free; | |
e8bc217a | 3301 | context->sync_page = paging32_sync_page; |
a7052897 | 3302 | context->invlpg = paging32_invlpg; |
0f53b5b1 | 3303 | context->update_pte = paging32_update_pte; |
6aa8b732 AK |
3304 | context->root_level = PT32_ROOT_LEVEL; |
3305 | context->shadow_root_level = PT32E_ROOT_LEVEL; | |
17c3ba9d | 3306 | context->root_hpa = INVALID_PAGE; |
c5a78f2b | 3307 | context->direct_map = false; |
6aa8b732 AK |
3308 | return 0; |
3309 | } | |
3310 | ||
52fde8df JR |
3311 | static int paging32E_init_context(struct kvm_vcpu *vcpu, |
3312 | struct kvm_mmu *context) | |
6aa8b732 | 3313 | { |
52fde8df | 3314 | return paging64_init_context_common(vcpu, context, PT32E_ROOT_LEVEL); |
6aa8b732 AK |
3315 | } |
3316 | ||
fb72d167 JR |
3317 | static int init_kvm_tdp_mmu(struct kvm_vcpu *vcpu) |
3318 | { | |
14dfe855 | 3319 | struct kvm_mmu *context = vcpu->arch.walk_mmu; |
fb72d167 | 3320 | |
c445f8ef | 3321 | context->base_role.word = 0; |
fb72d167 JR |
3322 | context->new_cr3 = nonpaging_new_cr3; |
3323 | context->page_fault = tdp_page_fault; | |
3324 | context->free = nonpaging_free; | |
e8bc217a | 3325 | context->sync_page = nonpaging_sync_page; |
a7052897 | 3326 | context->invlpg = nonpaging_invlpg; |
0f53b5b1 | 3327 | context->update_pte = nonpaging_update_pte; |
67253af5 | 3328 | context->shadow_root_level = kvm_x86_ops->get_tdp_level(); |
fb72d167 | 3329 | context->root_hpa = INVALID_PAGE; |
c5a78f2b | 3330 | context->direct_map = true; |
1c97f0a0 | 3331 | context->set_cr3 = kvm_x86_ops->set_tdp_cr3; |
5777ed34 | 3332 | context->get_cr3 = get_cr3; |
e4e517b4 | 3333 | context->get_pdptr = kvm_pdptr_read; |
cb659db8 | 3334 | context->inject_page_fault = kvm_inject_page_fault; |
2d48a985 | 3335 | context->nx = is_nx(vcpu); |
fb72d167 JR |
3336 | |
3337 | if (!is_paging(vcpu)) { | |
2d48a985 | 3338 | context->nx = false; |
fb72d167 JR |
3339 | context->gva_to_gpa = nonpaging_gva_to_gpa; |
3340 | context->root_level = 0; | |
3341 | } else if (is_long_mode(vcpu)) { | |
2d48a985 | 3342 | context->nx = is_nx(vcpu); |
52fde8df | 3343 | reset_rsvds_bits_mask(vcpu, context, PT64_ROOT_LEVEL); |
fb72d167 JR |
3344 | context->gva_to_gpa = paging64_gva_to_gpa; |
3345 | context->root_level = PT64_ROOT_LEVEL; | |
3346 | } else if (is_pae(vcpu)) { | |
2d48a985 | 3347 | context->nx = is_nx(vcpu); |
52fde8df | 3348 | reset_rsvds_bits_mask(vcpu, context, PT32E_ROOT_LEVEL); |
fb72d167 JR |
3349 | context->gva_to_gpa = paging64_gva_to_gpa; |
3350 | context->root_level = PT32E_ROOT_LEVEL; | |
3351 | } else { | |
2d48a985 | 3352 | context->nx = false; |
52fde8df | 3353 | reset_rsvds_bits_mask(vcpu, context, PT32_ROOT_LEVEL); |
fb72d167 JR |
3354 | context->gva_to_gpa = paging32_gva_to_gpa; |
3355 | context->root_level = PT32_ROOT_LEVEL; | |
3356 | } | |
3357 | ||
3358 | return 0; | |
3359 | } | |
3360 | ||
52fde8df | 3361 | int kvm_init_shadow_mmu(struct kvm_vcpu *vcpu, struct kvm_mmu *context) |
6aa8b732 | 3362 | { |
a770f6f2 | 3363 | int r; |
411c588d | 3364 | bool smep = kvm_read_cr4_bits(vcpu, X86_CR4_SMEP); |
6aa8b732 | 3365 | ASSERT(vcpu); |
ad312c7c | 3366 | ASSERT(!VALID_PAGE(vcpu->arch.mmu.root_hpa)); |
6aa8b732 AK |
3367 | |
3368 | if (!is_paging(vcpu)) | |
52fde8df | 3369 | r = nonpaging_init_context(vcpu, context); |
a9058ecd | 3370 | else if (is_long_mode(vcpu)) |
52fde8df | 3371 | r = paging64_init_context(vcpu, context); |
6aa8b732 | 3372 | else if (is_pae(vcpu)) |
52fde8df | 3373 | r = paging32E_init_context(vcpu, context); |
6aa8b732 | 3374 | else |
52fde8df | 3375 | r = paging32_init_context(vcpu, context); |
a770f6f2 | 3376 | |
5b7e0102 | 3377 | vcpu->arch.mmu.base_role.cr4_pae = !!is_pae(vcpu); |
f43addd4 | 3378 | vcpu->arch.mmu.base_role.cr0_wp = is_write_protection(vcpu); |
411c588d AK |
3379 | vcpu->arch.mmu.base_role.smep_andnot_wp |
3380 | = smep && !is_write_protection(vcpu); | |
52fde8df JR |
3381 | |
3382 | return r; | |
3383 | } | |
3384 | EXPORT_SYMBOL_GPL(kvm_init_shadow_mmu); | |
3385 | ||
3386 | static int init_kvm_softmmu(struct kvm_vcpu *vcpu) | |
3387 | { | |
14dfe855 | 3388 | int r = kvm_init_shadow_mmu(vcpu, vcpu->arch.walk_mmu); |
52fde8df | 3389 | |
14dfe855 JR |
3390 | vcpu->arch.walk_mmu->set_cr3 = kvm_x86_ops->set_cr3; |
3391 | vcpu->arch.walk_mmu->get_cr3 = get_cr3; | |
e4e517b4 | 3392 | vcpu->arch.walk_mmu->get_pdptr = kvm_pdptr_read; |
14dfe855 | 3393 | vcpu->arch.walk_mmu->inject_page_fault = kvm_inject_page_fault; |
a770f6f2 AK |
3394 | |
3395 | return r; | |
6aa8b732 AK |
3396 | } |
3397 | ||
02f59dc9 JR |
3398 | static int init_kvm_nested_mmu(struct kvm_vcpu *vcpu) |
3399 | { | |
3400 | struct kvm_mmu *g_context = &vcpu->arch.nested_mmu; | |
3401 | ||
3402 | g_context->get_cr3 = get_cr3; | |
e4e517b4 | 3403 | g_context->get_pdptr = kvm_pdptr_read; |
02f59dc9 JR |
3404 | g_context->inject_page_fault = kvm_inject_page_fault; |
3405 | ||
3406 | /* | |
3407 | * Note that arch.mmu.gva_to_gpa translates l2_gva to l1_gpa. The | |
3408 | * translation of l2_gpa to l1_gpa addresses is done using the | |
3409 | * arch.nested_mmu.gva_to_gpa function. Basically the gva_to_gpa | |
3410 | * functions between mmu and nested_mmu are swapped. | |
3411 | */ | |
3412 | if (!is_paging(vcpu)) { | |
2d48a985 | 3413 | g_context->nx = false; |
02f59dc9 JR |
3414 | g_context->root_level = 0; |
3415 | g_context->gva_to_gpa = nonpaging_gva_to_gpa_nested; | |
3416 | } else if (is_long_mode(vcpu)) { | |
2d48a985 | 3417 | g_context->nx = is_nx(vcpu); |
02f59dc9 JR |
3418 | reset_rsvds_bits_mask(vcpu, g_context, PT64_ROOT_LEVEL); |
3419 | g_context->root_level = PT64_ROOT_LEVEL; | |
3420 | g_context->gva_to_gpa = paging64_gva_to_gpa_nested; | |
3421 | } else if (is_pae(vcpu)) { | |
2d48a985 | 3422 | g_context->nx = is_nx(vcpu); |
02f59dc9 JR |
3423 | reset_rsvds_bits_mask(vcpu, g_context, PT32E_ROOT_LEVEL); |
3424 | g_context->root_level = PT32E_ROOT_LEVEL; | |
3425 | g_context->gva_to_gpa = paging64_gva_to_gpa_nested; | |
3426 | } else { | |
2d48a985 | 3427 | g_context->nx = false; |
02f59dc9 JR |
3428 | reset_rsvds_bits_mask(vcpu, g_context, PT32_ROOT_LEVEL); |
3429 | g_context->root_level = PT32_ROOT_LEVEL; | |
3430 | g_context->gva_to_gpa = paging32_gva_to_gpa_nested; | |
3431 | } | |
3432 | ||
3433 | return 0; | |
3434 | } | |
3435 | ||
fb72d167 JR |
3436 | static int init_kvm_mmu(struct kvm_vcpu *vcpu) |
3437 | { | |
02f59dc9 JR |
3438 | if (mmu_is_nested(vcpu)) |
3439 | return init_kvm_nested_mmu(vcpu); | |
3440 | else if (tdp_enabled) | |
fb72d167 JR |
3441 | return init_kvm_tdp_mmu(vcpu); |
3442 | else | |
3443 | return init_kvm_softmmu(vcpu); | |
3444 | } | |
3445 | ||
6aa8b732 AK |
3446 | static void destroy_kvm_mmu(struct kvm_vcpu *vcpu) |
3447 | { | |
3448 | ASSERT(vcpu); | |
62ad0755 SY |
3449 | if (VALID_PAGE(vcpu->arch.mmu.root_hpa)) |
3450 | /* mmu.free() should set root_hpa = INVALID_PAGE */ | |
ad312c7c | 3451 | vcpu->arch.mmu.free(vcpu); |
6aa8b732 AK |
3452 | } |
3453 | ||
3454 | int kvm_mmu_reset_context(struct kvm_vcpu *vcpu) | |
17c3ba9d AK |
3455 | { |
3456 | destroy_kvm_mmu(vcpu); | |
f8f7e5ee | 3457 | return init_kvm_mmu(vcpu); |
17c3ba9d | 3458 | } |
8668a3c4 | 3459 | EXPORT_SYMBOL_GPL(kvm_mmu_reset_context); |
17c3ba9d AK |
3460 | |
3461 | int kvm_mmu_load(struct kvm_vcpu *vcpu) | |
6aa8b732 | 3462 | { |
714b93da AK |
3463 | int r; |
3464 | ||
e2dec939 | 3465 | r = mmu_topup_memory_caches(vcpu); |
17c3ba9d AK |
3466 | if (r) |
3467 | goto out; | |
8986ecc0 | 3468 | r = mmu_alloc_roots(vcpu); |
8facbbff | 3469 | spin_lock(&vcpu->kvm->mmu_lock); |
0ba73cda | 3470 | mmu_sync_roots(vcpu); |
aaee2c94 | 3471 | spin_unlock(&vcpu->kvm->mmu_lock); |
8986ecc0 MT |
3472 | if (r) |
3473 | goto out; | |
3662cb1c | 3474 | /* set_cr3() should ensure TLB has been flushed */ |
f43addd4 | 3475 | vcpu->arch.mmu.set_cr3(vcpu, vcpu->arch.mmu.root_hpa); |
714b93da AK |
3476 | out: |
3477 | return r; | |
6aa8b732 | 3478 | } |
17c3ba9d AK |
3479 | EXPORT_SYMBOL_GPL(kvm_mmu_load); |
3480 | ||
3481 | void kvm_mmu_unload(struct kvm_vcpu *vcpu) | |
3482 | { | |
3483 | mmu_free_roots(vcpu); | |
3484 | } | |
4b16184c | 3485 | EXPORT_SYMBOL_GPL(kvm_mmu_unload); |
6aa8b732 | 3486 | |
0028425f | 3487 | static void mmu_pte_write_new_pte(struct kvm_vcpu *vcpu, |
7c562522 XG |
3488 | struct kvm_mmu_page *sp, u64 *spte, |
3489 | const void *new) | |
0028425f | 3490 | { |
30945387 | 3491 | if (sp->role.level != PT_PAGE_TABLE_LEVEL) { |
7e4e4056 JR |
3492 | ++vcpu->kvm->stat.mmu_pde_zapped; |
3493 | return; | |
30945387 | 3494 | } |
0028425f | 3495 | |
4cee5764 | 3496 | ++vcpu->kvm->stat.mmu_pte_updated; |
7c562522 | 3497 | vcpu->arch.mmu.update_pte(vcpu, sp, spte, new); |
0028425f AK |
3498 | } |
3499 | ||
79539cec AK |
3500 | static bool need_remote_flush(u64 old, u64 new) |
3501 | { | |
3502 | if (!is_shadow_present_pte(old)) | |
3503 | return false; | |
3504 | if (!is_shadow_present_pte(new)) | |
3505 | return true; | |
3506 | if ((old ^ new) & PT64_BASE_ADDR_MASK) | |
3507 | return true; | |
3508 | old ^= PT64_NX_MASK; | |
3509 | new ^= PT64_NX_MASK; | |
3510 | return (old & ~new & PT64_PERM_MASK) != 0; | |
3511 | } | |
3512 | ||
0671a8e7 XG |
3513 | static void mmu_pte_write_flush_tlb(struct kvm_vcpu *vcpu, bool zap_page, |
3514 | bool remote_flush, bool local_flush) | |
79539cec | 3515 | { |
0671a8e7 XG |
3516 | if (zap_page) |
3517 | return; | |
3518 | ||
3519 | if (remote_flush) | |
79539cec | 3520 | kvm_flush_remote_tlbs(vcpu->kvm); |
0671a8e7 | 3521 | else if (local_flush) |
79539cec AK |
3522 | kvm_mmu_flush_tlb(vcpu); |
3523 | } | |
3524 | ||
889e5cbc XG |
3525 | static u64 mmu_pte_write_fetch_gpte(struct kvm_vcpu *vcpu, gpa_t *gpa, |
3526 | const u8 *new, int *bytes) | |
da4a00f0 | 3527 | { |
889e5cbc XG |
3528 | u64 gentry; |
3529 | int r; | |
72016f3a | 3530 | |
72016f3a AK |
3531 | /* |
3532 | * Assume that the pte write on a page table of the same type | |
49b26e26 XG |
3533 | * as the current vcpu paging mode since we update the sptes only |
3534 | * when they have the same mode. | |
72016f3a | 3535 | */ |
889e5cbc | 3536 | if (is_pae(vcpu) && *bytes == 4) { |
72016f3a | 3537 | /* Handle a 32-bit guest writing two halves of a 64-bit gpte */ |
889e5cbc XG |
3538 | *gpa &= ~(gpa_t)7; |
3539 | *bytes = 8; | |
3540 | r = kvm_read_guest(vcpu->kvm, *gpa, &gentry, min(*bytes, 8)); | |
72016f3a AK |
3541 | if (r) |
3542 | gentry = 0; | |
08e850c6 AK |
3543 | new = (const u8 *)&gentry; |
3544 | } | |
3545 | ||
889e5cbc | 3546 | switch (*bytes) { |
08e850c6 AK |
3547 | case 4: |
3548 | gentry = *(const u32 *)new; | |
3549 | break; | |
3550 | case 8: | |
3551 | gentry = *(const u64 *)new; | |
3552 | break; | |
3553 | default: | |
3554 | gentry = 0; | |
3555 | break; | |
72016f3a AK |
3556 | } |
3557 | ||
889e5cbc XG |
3558 | return gentry; |
3559 | } | |
3560 | ||
3561 | /* | |
3562 | * If we're seeing too many writes to a page, it may no longer be a page table, | |
3563 | * or we may be forking, in which case it is better to unmap the page. | |
3564 | */ | |
a30f47cb | 3565 | static bool detect_write_flooding(struct kvm_mmu_page *sp, u64 *spte) |
889e5cbc | 3566 | { |
a30f47cb XG |
3567 | /* |
3568 | * Skip write-flooding detected for the sp whose level is 1, because | |
3569 | * it can become unsync, then the guest page is not write-protected. | |
3570 | */ | |
3571 | if (sp->role.level == 1) | |
3572 | return false; | |
3246af0e | 3573 | |
a30f47cb | 3574 | return ++sp->write_flooding_count >= 3; |
889e5cbc XG |
3575 | } |
3576 | ||
3577 | /* | |
3578 | * Misaligned accesses are too much trouble to fix up; also, they usually | |
3579 | * indicate a page is not used as a page table. | |
3580 | */ | |
3581 | static bool detect_write_misaligned(struct kvm_mmu_page *sp, gpa_t gpa, | |
3582 | int bytes) | |
3583 | { | |
3584 | unsigned offset, pte_size, misaligned; | |
3585 | ||
3586 | pgprintk("misaligned: gpa %llx bytes %d role %x\n", | |
3587 | gpa, bytes, sp->role.word); | |
3588 | ||
3589 | offset = offset_in_page(gpa); | |
3590 | pte_size = sp->role.cr4_pae ? 8 : 4; | |
5d9ca30e XG |
3591 | |
3592 | /* | |
3593 | * Sometimes, the OS only writes the last one bytes to update status | |
3594 | * bits, for example, in linux, andb instruction is used in clear_bit(). | |
3595 | */ | |
3596 | if (!(offset & (pte_size - 1)) && bytes == 1) | |
3597 | return false; | |
3598 | ||
889e5cbc XG |
3599 | misaligned = (offset ^ (offset + bytes - 1)) & ~(pte_size - 1); |
3600 | misaligned |= bytes < 4; | |
3601 | ||
3602 | return misaligned; | |
3603 | } | |
3604 | ||
3605 | static u64 *get_written_sptes(struct kvm_mmu_page *sp, gpa_t gpa, int *nspte) | |
3606 | { | |
3607 | unsigned page_offset, quadrant; | |
3608 | u64 *spte; | |
3609 | int level; | |
3610 | ||
3611 | page_offset = offset_in_page(gpa); | |
3612 | level = sp->role.level; | |
3613 | *nspte = 1; | |
3614 | if (!sp->role.cr4_pae) { | |
3615 | page_offset <<= 1; /* 32->64 */ | |
3616 | /* | |
3617 | * A 32-bit pde maps 4MB while the shadow pdes map | |
3618 | * only 2MB. So we need to double the offset again | |
3619 | * and zap two pdes instead of one. | |
3620 | */ | |
3621 | if (level == PT32_ROOT_LEVEL) { | |
3622 | page_offset &= ~7; /* kill rounding error */ | |
3623 | page_offset <<= 1; | |
3624 | *nspte = 2; | |
3625 | } | |
3626 | quadrant = page_offset >> PAGE_SHIFT; | |
3627 | page_offset &= ~PAGE_MASK; | |
3628 | if (quadrant != sp->role.quadrant) | |
3629 | return NULL; | |
3630 | } | |
3631 | ||
3632 | spte = &sp->spt[page_offset / sizeof(*spte)]; | |
3633 | return spte; | |
3634 | } | |
3635 | ||
3636 | void kvm_mmu_pte_write(struct kvm_vcpu *vcpu, gpa_t gpa, | |
3637 | const u8 *new, int bytes) | |
3638 | { | |
3639 | gfn_t gfn = gpa >> PAGE_SHIFT; | |
3640 | union kvm_mmu_page_role mask = { .word = 0 }; | |
3641 | struct kvm_mmu_page *sp; | |
3642 | struct hlist_node *node; | |
3643 | LIST_HEAD(invalid_list); | |
3644 | u64 entry, gentry, *spte; | |
3645 | int npte; | |
a30f47cb | 3646 | bool remote_flush, local_flush, zap_page; |
889e5cbc XG |
3647 | |
3648 | /* | |
3649 | * If we don't have indirect shadow pages, it means no page is | |
3650 | * write-protected, so we can exit simply. | |
3651 | */ | |
3652 | if (!ACCESS_ONCE(vcpu->kvm->arch.indirect_shadow_pages)) | |
3653 | return; | |
3654 | ||
3655 | zap_page = remote_flush = local_flush = false; | |
3656 | ||
3657 | pgprintk("%s: gpa %llx bytes %d\n", __func__, gpa, bytes); | |
3658 | ||
3659 | gentry = mmu_pte_write_fetch_gpte(vcpu, &gpa, new, &bytes); | |
3660 | ||
3661 | /* | |
3662 | * No need to care whether allocation memory is successful | |
3663 | * or not since pte prefetch is skiped if it does not have | |
3664 | * enough objects in the cache. | |
3665 | */ | |
3666 | mmu_topup_memory_caches(vcpu); | |
3667 | ||
3668 | spin_lock(&vcpu->kvm->mmu_lock); | |
3669 | ++vcpu->kvm->stat.mmu_pte_write; | |
3670 | trace_kvm_mmu_audit(vcpu, AUDIT_PRE_PTE_WRITE); | |
3671 | ||
fa1de2bf | 3672 | mask.cr0_wp = mask.cr4_pae = mask.nxe = 1; |
f41d335a | 3673 | for_each_gfn_indirect_valid_sp(vcpu->kvm, sp, gfn, node) { |
a30f47cb | 3674 | spte = get_written_sptes(sp, gpa, &npte); |
889e5cbc | 3675 | |
a30f47cb XG |
3676 | if (detect_write_misaligned(sp, gpa, bytes) || |
3677 | detect_write_flooding(sp, spte)) { | |
0671a8e7 | 3678 | zap_page |= !!kvm_mmu_prepare_zap_page(vcpu->kvm, sp, |
f41d335a | 3679 | &invalid_list); |
4cee5764 | 3680 | ++vcpu->kvm->stat.mmu_flooded; |
0e7bc4b9 AK |
3681 | continue; |
3682 | } | |
889e5cbc XG |
3683 | |
3684 | spte = get_written_sptes(sp, gpa, &npte); | |
3685 | if (!spte) | |
3686 | continue; | |
3687 | ||
0671a8e7 | 3688 | local_flush = true; |
ac1b714e | 3689 | while (npte--) { |
79539cec | 3690 | entry = *spte; |
38e3b2b2 | 3691 | mmu_page_zap_pte(vcpu->kvm, sp, spte); |
fa1de2bf XG |
3692 | if (gentry && |
3693 | !((sp->role.word ^ vcpu->arch.mmu.base_role.word) | |
f759e2b4 | 3694 | & mask.word) && rmap_can_add(vcpu)) |
7c562522 | 3695 | mmu_pte_write_new_pte(vcpu, sp, spte, &gentry); |
0671a8e7 XG |
3696 | if (!remote_flush && need_remote_flush(entry, *spte)) |
3697 | remote_flush = true; | |
ac1b714e | 3698 | ++spte; |
9b7a0325 | 3699 | } |
9b7a0325 | 3700 | } |
0671a8e7 | 3701 | mmu_pte_write_flush_tlb(vcpu, zap_page, remote_flush, local_flush); |
d98ba053 | 3702 | kvm_mmu_commit_zap_page(vcpu->kvm, &invalid_list); |
8b1fe17c | 3703 | trace_kvm_mmu_audit(vcpu, AUDIT_POST_PTE_WRITE); |
aaee2c94 | 3704 | spin_unlock(&vcpu->kvm->mmu_lock); |
da4a00f0 AK |
3705 | } |
3706 | ||
a436036b AK |
3707 | int kvm_mmu_unprotect_page_virt(struct kvm_vcpu *vcpu, gva_t gva) |
3708 | { | |
10589a46 MT |
3709 | gpa_t gpa; |
3710 | int r; | |
a436036b | 3711 | |
c5a78f2b | 3712 | if (vcpu->arch.mmu.direct_map) |
60f24784 AK |
3713 | return 0; |
3714 | ||
1871c602 | 3715 | gpa = kvm_mmu_gva_to_gpa_read(vcpu, gva, NULL); |
10589a46 | 3716 | |
10589a46 | 3717 | r = kvm_mmu_unprotect_page(vcpu->kvm, gpa >> PAGE_SHIFT); |
1cb3f3ae | 3718 | |
10589a46 | 3719 | return r; |
a436036b | 3720 | } |
577bdc49 | 3721 | EXPORT_SYMBOL_GPL(kvm_mmu_unprotect_page_virt); |
a436036b | 3722 | |
22d95b12 | 3723 | void __kvm_mmu_free_some_pages(struct kvm_vcpu *vcpu) |
ebeace86 | 3724 | { |
d98ba053 | 3725 | LIST_HEAD(invalid_list); |
103ad25a | 3726 | |
e0df7b9f | 3727 | while (kvm_mmu_available_pages(vcpu->kvm) < KVM_REFILL_PAGES && |
3b80fffe | 3728 | !list_empty(&vcpu->kvm->arch.active_mmu_pages)) { |
4db35314 | 3729 | struct kvm_mmu_page *sp; |
ebeace86 | 3730 | |
f05e70ac | 3731 | sp = container_of(vcpu->kvm->arch.active_mmu_pages.prev, |
4db35314 | 3732 | struct kvm_mmu_page, link); |
e0df7b9f | 3733 | kvm_mmu_prepare_zap_page(vcpu->kvm, sp, &invalid_list); |
4cee5764 | 3734 | ++vcpu->kvm->stat.mmu_recycled; |
ebeace86 | 3735 | } |
aa6bd187 | 3736 | kvm_mmu_commit_zap_page(vcpu->kvm, &invalid_list); |
ebeace86 | 3737 | } |
ebeace86 | 3738 | |
1cb3f3ae XG |
3739 | static bool is_mmio_page_fault(struct kvm_vcpu *vcpu, gva_t addr) |
3740 | { | |
3741 | if (vcpu->arch.mmu.direct_map || mmu_is_nested(vcpu)) | |
3742 | return vcpu_match_mmio_gpa(vcpu, addr); | |
3743 | ||
3744 | return vcpu_match_mmio_gva(vcpu, addr); | |
3745 | } | |
3746 | ||
dc25e89e AP |
3747 | int kvm_mmu_page_fault(struct kvm_vcpu *vcpu, gva_t cr2, u32 error_code, |
3748 | void *insn, int insn_len) | |
3067714c | 3749 | { |
1cb3f3ae | 3750 | int r, emulation_type = EMULTYPE_RETRY; |
3067714c AK |
3751 | enum emulation_result er; |
3752 | ||
56028d08 | 3753 | r = vcpu->arch.mmu.page_fault(vcpu, cr2, error_code, false); |
3067714c AK |
3754 | if (r < 0) |
3755 | goto out; | |
3756 | ||
3757 | if (!r) { | |
3758 | r = 1; | |
3759 | goto out; | |
3760 | } | |
3761 | ||
1cb3f3ae XG |
3762 | if (is_mmio_page_fault(vcpu, cr2)) |
3763 | emulation_type = 0; | |
3764 | ||
3765 | er = x86_emulate_instruction(vcpu, cr2, emulation_type, insn, insn_len); | |
3067714c AK |
3766 | |
3767 | switch (er) { | |
3768 | case EMULATE_DONE: | |
3769 | return 1; | |
3770 | case EMULATE_DO_MMIO: | |
3771 | ++vcpu->stat.mmio_exits; | |
6d77dbfc | 3772 | /* fall through */ |
3067714c | 3773 | case EMULATE_FAIL: |
3f5d18a9 | 3774 | return 0; |
3067714c AK |
3775 | default: |
3776 | BUG(); | |
3777 | } | |
3778 | out: | |
3067714c AK |
3779 | return r; |
3780 | } | |
3781 | EXPORT_SYMBOL_GPL(kvm_mmu_page_fault); | |
3782 | ||
a7052897 MT |
3783 | void kvm_mmu_invlpg(struct kvm_vcpu *vcpu, gva_t gva) |
3784 | { | |
a7052897 | 3785 | vcpu->arch.mmu.invlpg(vcpu, gva); |
a7052897 MT |
3786 | kvm_mmu_flush_tlb(vcpu); |
3787 | ++vcpu->stat.invlpg; | |
3788 | } | |
3789 | EXPORT_SYMBOL_GPL(kvm_mmu_invlpg); | |
3790 | ||
18552672 JR |
3791 | void kvm_enable_tdp(void) |
3792 | { | |
3793 | tdp_enabled = true; | |
3794 | } | |
3795 | EXPORT_SYMBOL_GPL(kvm_enable_tdp); | |
3796 | ||
5f4cb662 JR |
3797 | void kvm_disable_tdp(void) |
3798 | { | |
3799 | tdp_enabled = false; | |
3800 | } | |
3801 | EXPORT_SYMBOL_GPL(kvm_disable_tdp); | |
3802 | ||
6aa8b732 AK |
3803 | static void free_mmu_pages(struct kvm_vcpu *vcpu) |
3804 | { | |
ad312c7c | 3805 | free_page((unsigned long)vcpu->arch.mmu.pae_root); |
81407ca5 JR |
3806 | if (vcpu->arch.mmu.lm_root != NULL) |
3807 | free_page((unsigned long)vcpu->arch.mmu.lm_root); | |
6aa8b732 AK |
3808 | } |
3809 | ||
3810 | static int alloc_mmu_pages(struct kvm_vcpu *vcpu) | |
3811 | { | |
17ac10ad | 3812 | struct page *page; |
6aa8b732 AK |
3813 | int i; |
3814 | ||
3815 | ASSERT(vcpu); | |
3816 | ||
17ac10ad AK |
3817 | /* |
3818 | * When emulating 32-bit mode, cr3 is only 32 bits even on x86_64. | |
3819 | * Therefore we need to allocate shadow page tables in the first | |
3820 | * 4GB of memory, which happens to fit the DMA32 zone. | |
3821 | */ | |
3822 | page = alloc_page(GFP_KERNEL | __GFP_DMA32); | |
3823 | if (!page) | |
d7fa6ab2 WY |
3824 | return -ENOMEM; |
3825 | ||
ad312c7c | 3826 | vcpu->arch.mmu.pae_root = page_address(page); |
17ac10ad | 3827 | for (i = 0; i < 4; ++i) |
ad312c7c | 3828 | vcpu->arch.mmu.pae_root[i] = INVALID_PAGE; |
17ac10ad | 3829 | |
6aa8b732 | 3830 | return 0; |
6aa8b732 AK |
3831 | } |
3832 | ||
8018c27b | 3833 | int kvm_mmu_create(struct kvm_vcpu *vcpu) |
6aa8b732 | 3834 | { |
6aa8b732 | 3835 | ASSERT(vcpu); |
ad312c7c | 3836 | ASSERT(!VALID_PAGE(vcpu->arch.mmu.root_hpa)); |
6aa8b732 | 3837 | |
8018c27b IM |
3838 | return alloc_mmu_pages(vcpu); |
3839 | } | |
6aa8b732 | 3840 | |
8018c27b IM |
3841 | int kvm_mmu_setup(struct kvm_vcpu *vcpu) |
3842 | { | |
3843 | ASSERT(vcpu); | |
ad312c7c | 3844 | ASSERT(!VALID_PAGE(vcpu->arch.mmu.root_hpa)); |
2c264957 | 3845 | |
8018c27b | 3846 | return init_kvm_mmu(vcpu); |
6aa8b732 AK |
3847 | } |
3848 | ||
90cb0529 | 3849 | void kvm_mmu_slot_remove_write_access(struct kvm *kvm, int slot) |
6aa8b732 | 3850 | { |
4db35314 | 3851 | struct kvm_mmu_page *sp; |
6aa8b732 | 3852 | |
f05e70ac | 3853 | list_for_each_entry(sp, &kvm->arch.active_mmu_pages, link) { |
6aa8b732 AK |
3854 | int i; |
3855 | u64 *pt; | |
3856 | ||
291f26bc | 3857 | if (!test_bit(slot, sp->slot_bitmap)) |
6aa8b732 AK |
3858 | continue; |
3859 | ||
4db35314 | 3860 | pt = sp->spt; |
8234b22e | 3861 | for (i = 0; i < PT64_ENT_PER_PAGE; ++i) { |
da8dc75f XG |
3862 | if (!is_shadow_present_pte(pt[i]) || |
3863 | !is_last_spte(pt[i], sp->role.level)) | |
3864 | continue; | |
3865 | ||
3866 | if (is_large_pte(pt[i])) { | |
c3707958 | 3867 | drop_spte(kvm, &pt[i]); |
8234b22e | 3868 | --kvm->stat.lpages; |
da8dc75f | 3869 | continue; |
8234b22e | 3870 | } |
da8dc75f | 3871 | |
6aa8b732 | 3872 | /* avoid RMW */ |
01c168ac | 3873 | if (is_writable_pte(pt[i])) |
1df9f2dc XG |
3874 | mmu_spte_update(&pt[i], |
3875 | pt[i] & ~PT_WRITABLE_MASK); | |
8234b22e | 3876 | } |
6aa8b732 | 3877 | } |
171d595d | 3878 | kvm_flush_remote_tlbs(kvm); |
6aa8b732 | 3879 | } |
37a7d8b0 | 3880 | |
90cb0529 | 3881 | void kvm_mmu_zap_all(struct kvm *kvm) |
e0fa826f | 3882 | { |
4db35314 | 3883 | struct kvm_mmu_page *sp, *node; |
d98ba053 | 3884 | LIST_HEAD(invalid_list); |
e0fa826f | 3885 | |
aaee2c94 | 3886 | spin_lock(&kvm->mmu_lock); |
3246af0e | 3887 | restart: |
f05e70ac | 3888 | list_for_each_entry_safe(sp, node, &kvm->arch.active_mmu_pages, link) |
d98ba053 | 3889 | if (kvm_mmu_prepare_zap_page(kvm, sp, &invalid_list)) |
3246af0e XG |
3890 | goto restart; |
3891 | ||
d98ba053 | 3892 | kvm_mmu_commit_zap_page(kvm, &invalid_list); |
aaee2c94 | 3893 | spin_unlock(&kvm->mmu_lock); |
e0fa826f DL |
3894 | } |
3895 | ||
d98ba053 XG |
3896 | static int kvm_mmu_remove_some_alloc_mmu_pages(struct kvm *kvm, |
3897 | struct list_head *invalid_list) | |
3ee16c81 IE |
3898 | { |
3899 | struct kvm_mmu_page *page; | |
3900 | ||
3901 | page = container_of(kvm->arch.active_mmu_pages.prev, | |
3902 | struct kvm_mmu_page, link); | |
d98ba053 | 3903 | return kvm_mmu_prepare_zap_page(kvm, page, invalid_list); |
3ee16c81 IE |
3904 | } |
3905 | ||
1495f230 | 3906 | static int mmu_shrink(struct shrinker *shrink, struct shrink_control *sc) |
3ee16c81 IE |
3907 | { |
3908 | struct kvm *kvm; | |
3909 | struct kvm *kvm_freed = NULL; | |
1495f230 | 3910 | int nr_to_scan = sc->nr_to_scan; |
45221ab6 DH |
3911 | |
3912 | if (nr_to_scan == 0) | |
3913 | goto out; | |
3ee16c81 | 3914 | |
e935b837 | 3915 | raw_spin_lock(&kvm_lock); |
3ee16c81 IE |
3916 | |
3917 | list_for_each_entry(kvm, &vm_list, vm_list) { | |
45221ab6 | 3918 | int idx, freed_pages; |
d98ba053 | 3919 | LIST_HEAD(invalid_list); |
3ee16c81 | 3920 | |
f656ce01 | 3921 | idx = srcu_read_lock(&kvm->srcu); |
3ee16c81 | 3922 | spin_lock(&kvm->mmu_lock); |
45221ab6 DH |
3923 | if (!kvm_freed && nr_to_scan > 0 && |
3924 | kvm->arch.n_used_mmu_pages > 0) { | |
d98ba053 XG |
3925 | freed_pages = kvm_mmu_remove_some_alloc_mmu_pages(kvm, |
3926 | &invalid_list); | |
3ee16c81 IE |
3927 | kvm_freed = kvm; |
3928 | } | |
3929 | nr_to_scan--; | |
3930 | ||
d98ba053 | 3931 | kvm_mmu_commit_zap_page(kvm, &invalid_list); |
3ee16c81 | 3932 | spin_unlock(&kvm->mmu_lock); |
f656ce01 | 3933 | srcu_read_unlock(&kvm->srcu, idx); |
3ee16c81 IE |
3934 | } |
3935 | if (kvm_freed) | |
3936 | list_move_tail(&kvm_freed->vm_list, &vm_list); | |
3937 | ||
e935b837 | 3938 | raw_spin_unlock(&kvm_lock); |
3ee16c81 | 3939 | |
45221ab6 DH |
3940 | out: |
3941 | return percpu_counter_read_positive(&kvm_total_used_mmu_pages); | |
3ee16c81 IE |
3942 | } |
3943 | ||
3944 | static struct shrinker mmu_shrinker = { | |
3945 | .shrink = mmu_shrink, | |
3946 | .seeks = DEFAULT_SEEKS * 10, | |
3947 | }; | |
3948 | ||
2ddfd20e | 3949 | static void mmu_destroy_caches(void) |
b5a33a75 | 3950 | { |
53c07b18 XG |
3951 | if (pte_list_desc_cache) |
3952 | kmem_cache_destroy(pte_list_desc_cache); | |
d3d25b04 AK |
3953 | if (mmu_page_header_cache) |
3954 | kmem_cache_destroy(mmu_page_header_cache); | |
b5a33a75 AK |
3955 | } |
3956 | ||
3957 | int kvm_mmu_module_init(void) | |
3958 | { | |
53c07b18 XG |
3959 | pte_list_desc_cache = kmem_cache_create("pte_list_desc", |
3960 | sizeof(struct pte_list_desc), | |
20c2df83 | 3961 | 0, 0, NULL); |
53c07b18 | 3962 | if (!pte_list_desc_cache) |
b5a33a75 AK |
3963 | goto nomem; |
3964 | ||
d3d25b04 AK |
3965 | mmu_page_header_cache = kmem_cache_create("kvm_mmu_page_header", |
3966 | sizeof(struct kvm_mmu_page), | |
20c2df83 | 3967 | 0, 0, NULL); |
d3d25b04 AK |
3968 | if (!mmu_page_header_cache) |
3969 | goto nomem; | |
3970 | ||
45bf21a8 WY |
3971 | if (percpu_counter_init(&kvm_total_used_mmu_pages, 0)) |
3972 | goto nomem; | |
3973 | ||
3ee16c81 IE |
3974 | register_shrinker(&mmu_shrinker); |
3975 | ||
b5a33a75 AK |
3976 | return 0; |
3977 | ||
3978 | nomem: | |
3ee16c81 | 3979 | mmu_destroy_caches(); |
b5a33a75 AK |
3980 | return -ENOMEM; |
3981 | } | |
3982 | ||
3ad82a7e ZX |
3983 | /* |
3984 | * Caculate mmu pages needed for kvm. | |
3985 | */ | |
3986 | unsigned int kvm_mmu_calculate_mmu_pages(struct kvm *kvm) | |
3987 | { | |
3988 | int i; | |
3989 | unsigned int nr_mmu_pages; | |
3990 | unsigned int nr_pages = 0; | |
bc6678a3 | 3991 | struct kvm_memslots *slots; |
3ad82a7e | 3992 | |
90d83dc3 LJ |
3993 | slots = kvm_memslots(kvm); |
3994 | ||
bc6678a3 MT |
3995 | for (i = 0; i < slots->nmemslots; i++) |
3996 | nr_pages += slots->memslots[i].npages; | |
3ad82a7e ZX |
3997 | |
3998 | nr_mmu_pages = nr_pages * KVM_PERMILLE_MMU_PAGES / 1000; | |
3999 | nr_mmu_pages = max(nr_mmu_pages, | |
4000 | (unsigned int) KVM_MIN_ALLOC_MMU_PAGES); | |
4001 | ||
4002 | return nr_mmu_pages; | |
4003 | } | |
4004 | ||
94d8b056 MT |
4005 | int kvm_mmu_get_spte_hierarchy(struct kvm_vcpu *vcpu, u64 addr, u64 sptes[4]) |
4006 | { | |
4007 | struct kvm_shadow_walk_iterator iterator; | |
c2a2ac2b | 4008 | u64 spte; |
94d8b056 MT |
4009 | int nr_sptes = 0; |
4010 | ||
c2a2ac2b XG |
4011 | walk_shadow_page_lockless_begin(vcpu); |
4012 | for_each_shadow_entry_lockless(vcpu, addr, iterator, spte) { | |
4013 | sptes[iterator.level-1] = spte; | |
94d8b056 | 4014 | nr_sptes++; |
c2a2ac2b | 4015 | if (!is_shadow_present_pte(spte)) |
94d8b056 MT |
4016 | break; |
4017 | } | |
c2a2ac2b | 4018 | walk_shadow_page_lockless_end(vcpu); |
94d8b056 MT |
4019 | |
4020 | return nr_sptes; | |
4021 | } | |
4022 | EXPORT_SYMBOL_GPL(kvm_mmu_get_spte_hierarchy); | |
4023 | ||
c42fffe3 XG |
4024 | void kvm_mmu_destroy(struct kvm_vcpu *vcpu) |
4025 | { | |
4026 | ASSERT(vcpu); | |
4027 | ||
4028 | destroy_kvm_mmu(vcpu); | |
4029 | free_mmu_pages(vcpu); | |
4030 | mmu_free_memory_caches(vcpu); | |
b034cf01 XG |
4031 | } |
4032 | ||
4033 | #ifdef CONFIG_KVM_MMU_AUDIT | |
4034 | #include "mmu_audit.c" | |
4035 | #else | |
4036 | static void mmu_audit_disable(void) { } | |
4037 | #endif | |
4038 | ||
4039 | void kvm_mmu_module_exit(void) | |
4040 | { | |
4041 | mmu_destroy_caches(); | |
4042 | percpu_counter_destroy(&kvm_total_used_mmu_pages); | |
4043 | unregister_shrinker(&mmu_shrinker); | |
c42fffe3 XG |
4044 | mmu_audit_disable(); |
4045 | } |