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d94d71cb | 1 | // SPDX-License-Identifier: GPL-2.0-only |
749cf76c CD |
2 | /* |
3 | * Copyright (C) 2012 - Virtual Open Systems and Columbia University | |
4 | * Author: Christoffer Dall <c.dall@virtualopensystems.com> | |
749cf76c | 5 | */ |
342cd0ab CD |
6 | |
7 | #include <linux/mman.h> | |
8 | #include <linux/kvm_host.h> | |
9 | #include <linux/io.h> | |
ad361f09 | 10 | #include <linux/hugetlb.h> |
196f878a | 11 | #include <linux/sched/signal.h> |
45e96ea6 | 12 | #include <trace/events/kvm.h> |
342cd0ab | 13 | #include <asm/pgalloc.h> |
94f8e641 | 14 | #include <asm/cacheflush.h> |
342cd0ab CD |
15 | #include <asm/kvm_arm.h> |
16 | #include <asm/kvm_mmu.h> | |
0db5e022 | 17 | #include <asm/kvm_ras.h> |
d5d8184d | 18 | #include <asm/kvm_asm.h> |
94f8e641 | 19 | #include <asm/kvm_emulate.h> |
1e947bad | 20 | #include <asm/virt.h> |
d5d8184d CD |
21 | |
22 | #include "trace.h" | |
342cd0ab | 23 | |
5a677ce0 | 24 | static pgd_t *boot_hyp_pgd; |
2fb41059 | 25 | static pgd_t *hyp_pgd; |
e4c5a685 | 26 | static pgd_t *merged_hyp_pgd; |
342cd0ab CD |
27 | static DEFINE_MUTEX(kvm_hyp_pgd_mutex); |
28 | ||
5a677ce0 MZ |
29 | static unsigned long hyp_idmap_start; |
30 | static unsigned long hyp_idmap_end; | |
31 | static phys_addr_t hyp_idmap_vector; | |
32 | ||
e3f019b3 MZ |
33 | static unsigned long io_map_base; |
34 | ||
38f791a4 | 35 | #define hyp_pgd_order get_order(PTRS_PER_PGD * sizeof(pgd_t)) |
5d4e08c4 | 36 | |
15a49a44 MS |
37 | #define KVM_S2PTE_FLAG_IS_IOMAP (1UL << 0) |
38 | #define KVM_S2_FLAG_LOGGING_ACTIVE (1UL << 1) | |
39 | ||
6d674e28 MZ |
40 | static bool is_iomap(unsigned long flags) |
41 | { | |
42 | return flags & KVM_S2PTE_FLAG_IS_IOMAP; | |
43 | } | |
44 | ||
15a49a44 MS |
45 | static bool memslot_is_logging(struct kvm_memory_slot *memslot) |
46 | { | |
15a49a44 | 47 | return memslot->dirty_bitmap && !(memslot->flags & KVM_MEM_READONLY); |
7276030a MS |
48 | } |
49 | ||
50 | /** | |
51 | * kvm_flush_remote_tlbs() - flush all VM TLB entries for v7/8 | |
52 | * @kvm: pointer to kvm structure. | |
53 | * | |
54 | * Interface to HYP function to flush all VM TLB entries | |
55 | */ | |
56 | void kvm_flush_remote_tlbs(struct kvm *kvm) | |
57 | { | |
58 | kvm_call_hyp(__kvm_tlb_flush_vmid, kvm); | |
15a49a44 | 59 | } |
ad361f09 | 60 | |
48762767 | 61 | static void kvm_tlb_flush_vmid_ipa(struct kvm *kvm, phys_addr_t ipa) |
d5d8184d | 62 | { |
8684e701 | 63 | kvm_call_hyp(__kvm_tlb_flush_vmid_ipa, kvm, ipa); |
d5d8184d CD |
64 | } |
65 | ||
363ef89f MZ |
66 | /* |
67 | * D-Cache management functions. They take the page table entries by | |
68 | * value, as they are flushing the cache using the kernel mapping (or | |
69 | * kmap on 32bit). | |
70 | */ | |
71 | static void kvm_flush_dcache_pte(pte_t pte) | |
72 | { | |
73 | __kvm_flush_dcache_pte(pte); | |
74 | } | |
75 | ||
76 | static void kvm_flush_dcache_pmd(pmd_t pmd) | |
77 | { | |
78 | __kvm_flush_dcache_pmd(pmd); | |
79 | } | |
80 | ||
81 | static void kvm_flush_dcache_pud(pud_t pud) | |
82 | { | |
83 | __kvm_flush_dcache_pud(pud); | |
84 | } | |
85 | ||
e6fab544 AB |
86 | static bool kvm_is_device_pfn(unsigned long pfn) |
87 | { | |
88 | return !pfn_valid(pfn); | |
89 | } | |
90 | ||
15a49a44 MS |
91 | /** |
92 | * stage2_dissolve_pmd() - clear and flush huge PMD entry | |
93 | * @kvm: pointer to kvm structure. | |
94 | * @addr: IPA | |
95 | * @pmd: pmd pointer for IPA | |
96 | * | |
8324c3d5 | 97 | * Function clears a PMD entry, flushes addr 1st and 2nd stage TLBs. |
15a49a44 MS |
98 | */ |
99 | static void stage2_dissolve_pmd(struct kvm *kvm, phys_addr_t addr, pmd_t *pmd) | |
100 | { | |
bbb3b6b3 | 101 | if (!pmd_thp_or_huge(*pmd)) |
15a49a44 MS |
102 | return; |
103 | ||
104 | pmd_clear(pmd); | |
105 | kvm_tlb_flush_vmid_ipa(kvm, addr); | |
106 | put_page(virt_to_page(pmd)); | |
107 | } | |
108 | ||
b8e0ba7c PA |
109 | /** |
110 | * stage2_dissolve_pud() - clear and flush huge PUD entry | |
111 | * @kvm: pointer to kvm structure. | |
112 | * @addr: IPA | |
113 | * @pud: pud pointer for IPA | |
114 | * | |
8324c3d5 | 115 | * Function clears a PUD entry, flushes addr 1st and 2nd stage TLBs. |
b8e0ba7c PA |
116 | */ |
117 | static void stage2_dissolve_pud(struct kvm *kvm, phys_addr_t addr, pud_t *pudp) | |
118 | { | |
119 | if (!stage2_pud_huge(kvm, *pudp)) | |
120 | return; | |
121 | ||
122 | stage2_pud_clear(kvm, pudp); | |
123 | kvm_tlb_flush_vmid_ipa(kvm, addr); | |
124 | put_page(virt_to_page(pudp)); | |
125 | } | |
126 | ||
d5d8184d CD |
127 | static int mmu_topup_memory_cache(struct kvm_mmu_memory_cache *cache, |
128 | int min, int max) | |
129 | { | |
130 | void *page; | |
131 | ||
132 | BUG_ON(max > KVM_NR_MEM_OBJS); | |
133 | if (cache->nobjs >= min) | |
134 | return 0; | |
135 | while (cache->nobjs < max) { | |
50f11a8a | 136 | page = (void *)__get_free_page(GFP_PGTABLE_USER); |
d5d8184d CD |
137 | if (!page) |
138 | return -ENOMEM; | |
139 | cache->objects[cache->nobjs++] = page; | |
140 | } | |
141 | return 0; | |
142 | } | |
143 | ||
144 | static void mmu_free_memory_cache(struct kvm_mmu_memory_cache *mc) | |
145 | { | |
146 | while (mc->nobjs) | |
147 | free_page((unsigned long)mc->objects[--mc->nobjs]); | |
148 | } | |
149 | ||
150 | static void *mmu_memory_cache_alloc(struct kvm_mmu_memory_cache *mc) | |
151 | { | |
152 | void *p; | |
153 | ||
154 | BUG_ON(!mc || !mc->nobjs); | |
155 | p = mc->objects[--mc->nobjs]; | |
156 | return p; | |
157 | } | |
158 | ||
7a1c831e | 159 | static void clear_stage2_pgd_entry(struct kvm *kvm, pgd_t *pgd, phys_addr_t addr) |
979acd5e | 160 | { |
e55cac5b SP |
161 | pud_t *pud_table __maybe_unused = stage2_pud_offset(kvm, pgd, 0UL); |
162 | stage2_pgd_clear(kvm, pgd); | |
4f853a71 | 163 | kvm_tlb_flush_vmid_ipa(kvm, addr); |
e55cac5b | 164 | stage2_pud_free(kvm, pud_table); |
4f853a71 | 165 | put_page(virt_to_page(pgd)); |
979acd5e MZ |
166 | } |
167 | ||
7a1c831e | 168 | static void clear_stage2_pud_entry(struct kvm *kvm, pud_t *pud, phys_addr_t addr) |
342cd0ab | 169 | { |
e55cac5b SP |
170 | pmd_t *pmd_table __maybe_unused = stage2_pmd_offset(kvm, pud, 0); |
171 | VM_BUG_ON(stage2_pud_huge(kvm, *pud)); | |
172 | stage2_pud_clear(kvm, pud); | |
4f853a71 | 173 | kvm_tlb_flush_vmid_ipa(kvm, addr); |
e55cac5b | 174 | stage2_pmd_free(kvm, pmd_table); |
4f728276 MZ |
175 | put_page(virt_to_page(pud)); |
176 | } | |
342cd0ab | 177 | |
7a1c831e | 178 | static void clear_stage2_pmd_entry(struct kvm *kvm, pmd_t *pmd, phys_addr_t addr) |
4f728276 | 179 | { |
4f853a71 | 180 | pte_t *pte_table = pte_offset_kernel(pmd, 0); |
bbb3b6b3 | 181 | VM_BUG_ON(pmd_thp_or_huge(*pmd)); |
4f853a71 CD |
182 | pmd_clear(pmd); |
183 | kvm_tlb_flush_vmid_ipa(kvm, addr); | |
14b94d07 | 184 | free_page((unsigned long)pte_table); |
4f728276 MZ |
185 | put_page(virt_to_page(pmd)); |
186 | } | |
187 | ||
88dc25e8 MZ |
188 | static inline void kvm_set_pte(pte_t *ptep, pte_t new_pte) |
189 | { | |
190 | WRITE_ONCE(*ptep, new_pte); | |
191 | dsb(ishst); | |
192 | } | |
193 | ||
194 | static inline void kvm_set_pmd(pmd_t *pmdp, pmd_t new_pmd) | |
195 | { | |
196 | WRITE_ONCE(*pmdp, new_pmd); | |
197 | dsb(ishst); | |
198 | } | |
199 | ||
0db9dd8a MZ |
200 | static inline void kvm_pmd_populate(pmd_t *pmdp, pte_t *ptep) |
201 | { | |
202 | kvm_set_pmd(pmdp, kvm_mk_pmd(ptep)); | |
203 | } | |
204 | ||
205 | static inline void kvm_pud_populate(pud_t *pudp, pmd_t *pmdp) | |
206 | { | |
207 | WRITE_ONCE(*pudp, kvm_mk_pud(pmdp)); | |
208 | dsb(ishst); | |
209 | } | |
210 | ||
211 | static inline void kvm_pgd_populate(pgd_t *pgdp, pud_t *pudp) | |
212 | { | |
213 | WRITE_ONCE(*pgdp, kvm_mk_pgd(pudp)); | |
214 | dsb(ishst); | |
215 | } | |
216 | ||
363ef89f MZ |
217 | /* |
218 | * Unmapping vs dcache management: | |
219 | * | |
220 | * If a guest maps certain memory pages as uncached, all writes will | |
221 | * bypass the data cache and go directly to RAM. However, the CPUs | |
222 | * can still speculate reads (not writes) and fill cache lines with | |
223 | * data. | |
224 | * | |
225 | * Those cache lines will be *clean* cache lines though, so a | |
226 | * clean+invalidate operation is equivalent to an invalidate | |
227 | * operation, because no cache lines are marked dirty. | |
228 | * | |
229 | * Those clean cache lines could be filled prior to an uncached write | |
230 | * by the guest, and the cache coherent IO subsystem would therefore | |
231 | * end up writing old data to disk. | |
232 | * | |
233 | * This is why right after unmapping a page/section and invalidating | |
234 | * the corresponding TLBs, we call kvm_flush_dcache_p*() to make sure | |
235 | * the IO subsystem will never hit in the cache. | |
e48d53a9 MZ |
236 | * |
237 | * This is all avoided on systems that have ARM64_HAS_STAGE2_FWB, as | |
238 | * we then fully enforce cacheability of RAM, no matter what the guest | |
239 | * does. | |
363ef89f | 240 | */ |
7a1c831e | 241 | static void unmap_stage2_ptes(struct kvm *kvm, pmd_t *pmd, |
4f853a71 | 242 | phys_addr_t addr, phys_addr_t end) |
4f728276 | 243 | { |
4f853a71 CD |
244 | phys_addr_t start_addr = addr; |
245 | pte_t *pte, *start_pte; | |
246 | ||
247 | start_pte = pte = pte_offset_kernel(pmd, addr); | |
248 | do { | |
249 | if (!pte_none(*pte)) { | |
363ef89f MZ |
250 | pte_t old_pte = *pte; |
251 | ||
4f853a71 | 252 | kvm_set_pte(pte, __pte(0)); |
4f853a71 | 253 | kvm_tlb_flush_vmid_ipa(kvm, addr); |
363ef89f MZ |
254 | |
255 | /* No need to invalidate the cache for device mappings */ | |
0de58f85 | 256 | if (!kvm_is_device_pfn(pte_pfn(old_pte))) |
363ef89f MZ |
257 | kvm_flush_dcache_pte(old_pte); |
258 | ||
259 | put_page(virt_to_page(pte)); | |
4f853a71 CD |
260 | } |
261 | } while (pte++, addr += PAGE_SIZE, addr != end); | |
262 | ||
e55cac5b | 263 | if (stage2_pte_table_empty(kvm, start_pte)) |
7a1c831e | 264 | clear_stage2_pmd_entry(kvm, pmd, start_addr); |
342cd0ab CD |
265 | } |
266 | ||
7a1c831e | 267 | static void unmap_stage2_pmds(struct kvm *kvm, pud_t *pud, |
4f853a71 | 268 | phys_addr_t addr, phys_addr_t end) |
000d3996 | 269 | { |
4f853a71 CD |
270 | phys_addr_t next, start_addr = addr; |
271 | pmd_t *pmd, *start_pmd; | |
000d3996 | 272 | |
e55cac5b | 273 | start_pmd = pmd = stage2_pmd_offset(kvm, pud, addr); |
4f853a71 | 274 | do { |
e55cac5b | 275 | next = stage2_pmd_addr_end(kvm, addr, end); |
4f853a71 | 276 | if (!pmd_none(*pmd)) { |
bbb3b6b3 | 277 | if (pmd_thp_or_huge(*pmd)) { |
363ef89f MZ |
278 | pmd_t old_pmd = *pmd; |
279 | ||
4f853a71 CD |
280 | pmd_clear(pmd); |
281 | kvm_tlb_flush_vmid_ipa(kvm, addr); | |
363ef89f MZ |
282 | |
283 | kvm_flush_dcache_pmd(old_pmd); | |
284 | ||
4f853a71 CD |
285 | put_page(virt_to_page(pmd)); |
286 | } else { | |
7a1c831e | 287 | unmap_stage2_ptes(kvm, pmd, addr, next); |
4f853a71 | 288 | } |
ad361f09 | 289 | } |
4f853a71 | 290 | } while (pmd++, addr = next, addr != end); |
ad361f09 | 291 | |
e55cac5b | 292 | if (stage2_pmd_table_empty(kvm, start_pmd)) |
7a1c831e | 293 | clear_stage2_pud_entry(kvm, pud, start_addr); |
4f853a71 | 294 | } |
000d3996 | 295 | |
7a1c831e | 296 | static void unmap_stage2_puds(struct kvm *kvm, pgd_t *pgd, |
4f853a71 CD |
297 | phys_addr_t addr, phys_addr_t end) |
298 | { | |
299 | phys_addr_t next, start_addr = addr; | |
300 | pud_t *pud, *start_pud; | |
4f728276 | 301 | |
e55cac5b | 302 | start_pud = pud = stage2_pud_offset(kvm, pgd, addr); |
4f853a71 | 303 | do { |
e55cac5b SP |
304 | next = stage2_pud_addr_end(kvm, addr, end); |
305 | if (!stage2_pud_none(kvm, *pud)) { | |
306 | if (stage2_pud_huge(kvm, *pud)) { | |
363ef89f MZ |
307 | pud_t old_pud = *pud; |
308 | ||
e55cac5b | 309 | stage2_pud_clear(kvm, pud); |
4f853a71 | 310 | kvm_tlb_flush_vmid_ipa(kvm, addr); |
363ef89f | 311 | kvm_flush_dcache_pud(old_pud); |
4f853a71 CD |
312 | put_page(virt_to_page(pud)); |
313 | } else { | |
7a1c831e | 314 | unmap_stage2_pmds(kvm, pud, addr, next); |
4f728276 MZ |
315 | } |
316 | } | |
4f853a71 | 317 | } while (pud++, addr = next, addr != end); |
4f728276 | 318 | |
e55cac5b | 319 | if (stage2_pud_table_empty(kvm, start_pud)) |
7a1c831e | 320 | clear_stage2_pgd_entry(kvm, pgd, start_addr); |
4f853a71 CD |
321 | } |
322 | ||
7a1c831e SP |
323 | /** |
324 | * unmap_stage2_range -- Clear stage2 page table entries to unmap a range | |
325 | * @kvm: The VM pointer | |
326 | * @start: The intermediate physical base address of the range to unmap | |
327 | * @size: The size of the area to unmap | |
328 | * | |
329 | * Clear a range of stage-2 mappings, lowering the various ref-counts. Must | |
330 | * be called while holding mmu_lock (unless for freeing the stage2 pgd before | |
331 | * destroying the VM), otherwise another faulting VCPU may come in and mess | |
332 | * with things behind our backs. | |
333 | */ | |
334 | static void unmap_stage2_range(struct kvm *kvm, phys_addr_t start, u64 size) | |
4f853a71 CD |
335 | { |
336 | pgd_t *pgd; | |
337 | phys_addr_t addr = start, end = start + size; | |
338 | phys_addr_t next; | |
339 | ||
8b3405e3 | 340 | assert_spin_locked(&kvm->mmu_lock); |
47a91b72 JH |
341 | WARN_ON(size & ~PAGE_MASK); |
342 | ||
e55cac5b | 343 | pgd = kvm->arch.pgd + stage2_pgd_index(kvm, addr); |
4f853a71 | 344 | do { |
0c428a6a SP |
345 | /* |
346 | * Make sure the page table is still active, as another thread | |
347 | * could have possibly freed the page table, while we released | |
348 | * the lock. | |
349 | */ | |
350 | if (!READ_ONCE(kvm->arch.pgd)) | |
351 | break; | |
e55cac5b SP |
352 | next = stage2_pgd_addr_end(kvm, addr, end); |
353 | if (!stage2_pgd_none(kvm, *pgd)) | |
7a1c831e | 354 | unmap_stage2_puds(kvm, pgd, addr, next); |
8b3405e3 SP |
355 | /* |
356 | * If the range is too large, release the kvm->mmu_lock | |
357 | * to prevent starvation and lockup detector warnings. | |
358 | */ | |
359 | if (next != end) | |
360 | cond_resched_lock(&kvm->mmu_lock); | |
4f853a71 | 361 | } while (pgd++, addr = next, addr != end); |
000d3996 MZ |
362 | } |
363 | ||
9d218a1f MZ |
364 | static void stage2_flush_ptes(struct kvm *kvm, pmd_t *pmd, |
365 | phys_addr_t addr, phys_addr_t end) | |
366 | { | |
367 | pte_t *pte; | |
368 | ||
369 | pte = pte_offset_kernel(pmd, addr); | |
370 | do { | |
0de58f85 | 371 | if (!pte_none(*pte) && !kvm_is_device_pfn(pte_pfn(*pte))) |
363ef89f | 372 | kvm_flush_dcache_pte(*pte); |
9d218a1f MZ |
373 | } while (pte++, addr += PAGE_SIZE, addr != end); |
374 | } | |
375 | ||
376 | static void stage2_flush_pmds(struct kvm *kvm, pud_t *pud, | |
377 | phys_addr_t addr, phys_addr_t end) | |
378 | { | |
379 | pmd_t *pmd; | |
380 | phys_addr_t next; | |
381 | ||
e55cac5b | 382 | pmd = stage2_pmd_offset(kvm, pud, addr); |
9d218a1f | 383 | do { |
e55cac5b | 384 | next = stage2_pmd_addr_end(kvm, addr, end); |
9d218a1f | 385 | if (!pmd_none(*pmd)) { |
bbb3b6b3 | 386 | if (pmd_thp_or_huge(*pmd)) |
363ef89f MZ |
387 | kvm_flush_dcache_pmd(*pmd); |
388 | else | |
9d218a1f | 389 | stage2_flush_ptes(kvm, pmd, addr, next); |
9d218a1f MZ |
390 | } |
391 | } while (pmd++, addr = next, addr != end); | |
392 | } | |
393 | ||
394 | static void stage2_flush_puds(struct kvm *kvm, pgd_t *pgd, | |
395 | phys_addr_t addr, phys_addr_t end) | |
396 | { | |
397 | pud_t *pud; | |
398 | phys_addr_t next; | |
399 | ||
e55cac5b | 400 | pud = stage2_pud_offset(kvm, pgd, addr); |
9d218a1f | 401 | do { |
e55cac5b SP |
402 | next = stage2_pud_addr_end(kvm, addr, end); |
403 | if (!stage2_pud_none(kvm, *pud)) { | |
404 | if (stage2_pud_huge(kvm, *pud)) | |
363ef89f MZ |
405 | kvm_flush_dcache_pud(*pud); |
406 | else | |
9d218a1f | 407 | stage2_flush_pmds(kvm, pud, addr, next); |
9d218a1f MZ |
408 | } |
409 | } while (pud++, addr = next, addr != end); | |
410 | } | |
411 | ||
412 | static void stage2_flush_memslot(struct kvm *kvm, | |
413 | struct kvm_memory_slot *memslot) | |
414 | { | |
415 | phys_addr_t addr = memslot->base_gfn << PAGE_SHIFT; | |
416 | phys_addr_t end = addr + PAGE_SIZE * memslot->npages; | |
417 | phys_addr_t next; | |
418 | pgd_t *pgd; | |
419 | ||
e55cac5b | 420 | pgd = kvm->arch.pgd + stage2_pgd_index(kvm, addr); |
9d218a1f | 421 | do { |
e55cac5b SP |
422 | next = stage2_pgd_addr_end(kvm, addr, end); |
423 | if (!stage2_pgd_none(kvm, *pgd)) | |
d2db7773 | 424 | stage2_flush_puds(kvm, pgd, addr, next); |
9d218a1f MZ |
425 | } while (pgd++, addr = next, addr != end); |
426 | } | |
427 | ||
428 | /** | |
429 | * stage2_flush_vm - Invalidate cache for pages mapped in stage 2 | |
430 | * @kvm: The struct kvm pointer | |
431 | * | |
432 | * Go through the stage 2 page tables and invalidate any cache lines | |
433 | * backing memory already mapped to the VM. | |
434 | */ | |
3c1e7165 | 435 | static void stage2_flush_vm(struct kvm *kvm) |
9d218a1f MZ |
436 | { |
437 | struct kvm_memslots *slots; | |
438 | struct kvm_memory_slot *memslot; | |
439 | int idx; | |
440 | ||
441 | idx = srcu_read_lock(&kvm->srcu); | |
442 | spin_lock(&kvm->mmu_lock); | |
443 | ||
444 | slots = kvm_memslots(kvm); | |
445 | kvm_for_each_memslot(memslot, slots) | |
446 | stage2_flush_memslot(kvm, memslot); | |
447 | ||
448 | spin_unlock(&kvm->mmu_lock); | |
449 | srcu_read_unlock(&kvm->srcu, idx); | |
450 | } | |
451 | ||
64f32497 SP |
452 | static void clear_hyp_pgd_entry(pgd_t *pgd) |
453 | { | |
454 | pud_t *pud_table __maybe_unused = pud_offset(pgd, 0UL); | |
455 | pgd_clear(pgd); | |
456 | pud_free(NULL, pud_table); | |
457 | put_page(virt_to_page(pgd)); | |
458 | } | |
459 | ||
460 | static void clear_hyp_pud_entry(pud_t *pud) | |
461 | { | |
462 | pmd_t *pmd_table __maybe_unused = pmd_offset(pud, 0); | |
463 | VM_BUG_ON(pud_huge(*pud)); | |
464 | pud_clear(pud); | |
465 | pmd_free(NULL, pmd_table); | |
466 | put_page(virt_to_page(pud)); | |
467 | } | |
468 | ||
469 | static void clear_hyp_pmd_entry(pmd_t *pmd) | |
470 | { | |
471 | pte_t *pte_table = pte_offset_kernel(pmd, 0); | |
472 | VM_BUG_ON(pmd_thp_or_huge(*pmd)); | |
473 | pmd_clear(pmd); | |
474 | pte_free_kernel(NULL, pte_table); | |
475 | put_page(virt_to_page(pmd)); | |
476 | } | |
477 | ||
478 | static void unmap_hyp_ptes(pmd_t *pmd, phys_addr_t addr, phys_addr_t end) | |
479 | { | |
480 | pte_t *pte, *start_pte; | |
481 | ||
482 | start_pte = pte = pte_offset_kernel(pmd, addr); | |
483 | do { | |
484 | if (!pte_none(*pte)) { | |
485 | kvm_set_pte(pte, __pte(0)); | |
486 | put_page(virt_to_page(pte)); | |
487 | } | |
488 | } while (pte++, addr += PAGE_SIZE, addr != end); | |
489 | ||
490 | if (hyp_pte_table_empty(start_pte)) | |
491 | clear_hyp_pmd_entry(pmd); | |
492 | } | |
493 | ||
494 | static void unmap_hyp_pmds(pud_t *pud, phys_addr_t addr, phys_addr_t end) | |
495 | { | |
496 | phys_addr_t next; | |
497 | pmd_t *pmd, *start_pmd; | |
498 | ||
499 | start_pmd = pmd = pmd_offset(pud, addr); | |
500 | do { | |
501 | next = pmd_addr_end(addr, end); | |
502 | /* Hyp doesn't use huge pmds */ | |
503 | if (!pmd_none(*pmd)) | |
504 | unmap_hyp_ptes(pmd, addr, next); | |
505 | } while (pmd++, addr = next, addr != end); | |
506 | ||
507 | if (hyp_pmd_table_empty(start_pmd)) | |
508 | clear_hyp_pud_entry(pud); | |
509 | } | |
510 | ||
511 | static void unmap_hyp_puds(pgd_t *pgd, phys_addr_t addr, phys_addr_t end) | |
512 | { | |
513 | phys_addr_t next; | |
514 | pud_t *pud, *start_pud; | |
515 | ||
516 | start_pud = pud = pud_offset(pgd, addr); | |
517 | do { | |
518 | next = pud_addr_end(addr, end); | |
519 | /* Hyp doesn't use huge puds */ | |
520 | if (!pud_none(*pud)) | |
521 | unmap_hyp_pmds(pud, addr, next); | |
522 | } while (pud++, addr = next, addr != end); | |
523 | ||
524 | if (hyp_pud_table_empty(start_pud)) | |
525 | clear_hyp_pgd_entry(pgd); | |
526 | } | |
527 | ||
3ddd4556 MZ |
528 | static unsigned int kvm_pgd_index(unsigned long addr, unsigned int ptrs_per_pgd) |
529 | { | |
530 | return (addr >> PGDIR_SHIFT) & (ptrs_per_pgd - 1); | |
531 | } | |
532 | ||
533 | static void __unmap_hyp_range(pgd_t *pgdp, unsigned long ptrs_per_pgd, | |
534 | phys_addr_t start, u64 size) | |
64f32497 SP |
535 | { |
536 | pgd_t *pgd; | |
537 | phys_addr_t addr = start, end = start + size; | |
538 | phys_addr_t next; | |
539 | ||
540 | /* | |
541 | * We don't unmap anything from HYP, except at the hyp tear down. | |
542 | * Hence, we don't have to invalidate the TLBs here. | |
543 | */ | |
3ddd4556 | 544 | pgd = pgdp + kvm_pgd_index(addr, ptrs_per_pgd); |
64f32497 SP |
545 | do { |
546 | next = pgd_addr_end(addr, end); | |
547 | if (!pgd_none(*pgd)) | |
548 | unmap_hyp_puds(pgd, addr, next); | |
549 | } while (pgd++, addr = next, addr != end); | |
550 | } | |
551 | ||
3ddd4556 MZ |
552 | static void unmap_hyp_range(pgd_t *pgdp, phys_addr_t start, u64 size) |
553 | { | |
554 | __unmap_hyp_range(pgdp, PTRS_PER_PGD, start, size); | |
555 | } | |
556 | ||
557 | static void unmap_hyp_idmap_range(pgd_t *pgdp, phys_addr_t start, u64 size) | |
558 | { | |
559 | __unmap_hyp_range(pgdp, __kvm_idmap_ptrs_per_pgd(), start, size); | |
560 | } | |
561 | ||
342cd0ab | 562 | /** |
4f728276 | 563 | * free_hyp_pgds - free Hyp-mode page tables |
342cd0ab | 564 | * |
5a677ce0 MZ |
565 | * Assumes hyp_pgd is a page table used strictly in Hyp-mode and |
566 | * therefore contains either mappings in the kernel memory area (above | |
e3f019b3 | 567 | * PAGE_OFFSET), or device mappings in the idmap range. |
5a677ce0 | 568 | * |
e3f019b3 MZ |
569 | * boot_hyp_pgd should only map the idmap range, and is only used in |
570 | * the extended idmap case. | |
342cd0ab | 571 | */ |
4f728276 | 572 | void free_hyp_pgds(void) |
342cd0ab | 573 | { |
e3f019b3 MZ |
574 | pgd_t *id_pgd; |
575 | ||
d157f4a5 | 576 | mutex_lock(&kvm_hyp_pgd_mutex); |
5a677ce0 | 577 | |
e3f019b3 MZ |
578 | id_pgd = boot_hyp_pgd ? boot_hyp_pgd : hyp_pgd; |
579 | ||
580 | if (id_pgd) { | |
581 | /* In case we never called hyp_mmu_init() */ | |
582 | if (!io_map_base) | |
583 | io_map_base = hyp_idmap_start; | |
584 | unmap_hyp_idmap_range(id_pgd, io_map_base, | |
585 | hyp_idmap_start + PAGE_SIZE - io_map_base); | |
586 | } | |
587 | ||
26781f9c | 588 | if (boot_hyp_pgd) { |
26781f9c MZ |
589 | free_pages((unsigned long)boot_hyp_pgd, hyp_pgd_order); |
590 | boot_hyp_pgd = NULL; | |
591 | } | |
592 | ||
4f728276 | 593 | if (hyp_pgd) { |
7839c672 MZ |
594 | unmap_hyp_range(hyp_pgd, kern_hyp_va(PAGE_OFFSET), |
595 | (uintptr_t)high_memory - PAGE_OFFSET); | |
d4cb9df5 | 596 | |
38f791a4 | 597 | free_pages((unsigned long)hyp_pgd, hyp_pgd_order); |
d157f4a5 | 598 | hyp_pgd = NULL; |
4f728276 | 599 | } |
e4c5a685 AB |
600 | if (merged_hyp_pgd) { |
601 | clear_page(merged_hyp_pgd); | |
602 | free_page((unsigned long)merged_hyp_pgd); | |
603 | merged_hyp_pgd = NULL; | |
604 | } | |
4f728276 | 605 | |
342cd0ab CD |
606 | mutex_unlock(&kvm_hyp_pgd_mutex); |
607 | } | |
608 | ||
609 | static void create_hyp_pte_mappings(pmd_t *pmd, unsigned long start, | |
6060df84 MZ |
610 | unsigned long end, unsigned long pfn, |
611 | pgprot_t prot) | |
342cd0ab CD |
612 | { |
613 | pte_t *pte; | |
614 | unsigned long addr; | |
342cd0ab | 615 | |
3562c76d MZ |
616 | addr = start; |
617 | do { | |
6060df84 | 618 | pte = pte_offset_kernel(pmd, addr); |
f8df7338 | 619 | kvm_set_pte(pte, kvm_pfn_pte(pfn, prot)); |
4f728276 | 620 | get_page(virt_to_page(pte)); |
6060df84 | 621 | pfn++; |
3562c76d | 622 | } while (addr += PAGE_SIZE, addr != end); |
342cd0ab CD |
623 | } |
624 | ||
625 | static int create_hyp_pmd_mappings(pud_t *pud, unsigned long start, | |
6060df84 MZ |
626 | unsigned long end, unsigned long pfn, |
627 | pgprot_t prot) | |
342cd0ab CD |
628 | { |
629 | pmd_t *pmd; | |
630 | pte_t *pte; | |
631 | unsigned long addr, next; | |
632 | ||
3562c76d MZ |
633 | addr = start; |
634 | do { | |
6060df84 | 635 | pmd = pmd_offset(pud, addr); |
342cd0ab CD |
636 | |
637 | BUG_ON(pmd_sect(*pmd)); | |
638 | ||
639 | if (pmd_none(*pmd)) { | |
4cf58924 | 640 | pte = pte_alloc_one_kernel(NULL); |
342cd0ab CD |
641 | if (!pte) { |
642 | kvm_err("Cannot allocate Hyp pte\n"); | |
643 | return -ENOMEM; | |
644 | } | |
0db9dd8a | 645 | kvm_pmd_populate(pmd, pte); |
4f728276 | 646 | get_page(virt_to_page(pmd)); |
342cd0ab CD |
647 | } |
648 | ||
649 | next = pmd_addr_end(addr, end); | |
650 | ||
6060df84 MZ |
651 | create_hyp_pte_mappings(pmd, addr, next, pfn, prot); |
652 | pfn += (next - addr) >> PAGE_SHIFT; | |
3562c76d | 653 | } while (addr = next, addr != end); |
342cd0ab CD |
654 | |
655 | return 0; | |
656 | } | |
657 | ||
38f791a4 CD |
658 | static int create_hyp_pud_mappings(pgd_t *pgd, unsigned long start, |
659 | unsigned long end, unsigned long pfn, | |
660 | pgprot_t prot) | |
661 | { | |
662 | pud_t *pud; | |
663 | pmd_t *pmd; | |
664 | unsigned long addr, next; | |
665 | int ret; | |
666 | ||
667 | addr = start; | |
668 | do { | |
669 | pud = pud_offset(pgd, addr); | |
670 | ||
671 | if (pud_none_or_clear_bad(pud)) { | |
672 | pmd = pmd_alloc_one(NULL, addr); | |
673 | if (!pmd) { | |
674 | kvm_err("Cannot allocate Hyp pmd\n"); | |
675 | return -ENOMEM; | |
676 | } | |
0db9dd8a | 677 | kvm_pud_populate(pud, pmd); |
38f791a4 | 678 | get_page(virt_to_page(pud)); |
38f791a4 CD |
679 | } |
680 | ||
681 | next = pud_addr_end(addr, end); | |
682 | ret = create_hyp_pmd_mappings(pud, addr, next, pfn, prot); | |
683 | if (ret) | |
684 | return ret; | |
685 | pfn += (next - addr) >> PAGE_SHIFT; | |
686 | } while (addr = next, addr != end); | |
687 | ||
688 | return 0; | |
689 | } | |
690 | ||
98732d1b | 691 | static int __create_hyp_mappings(pgd_t *pgdp, unsigned long ptrs_per_pgd, |
6060df84 MZ |
692 | unsigned long start, unsigned long end, |
693 | unsigned long pfn, pgprot_t prot) | |
342cd0ab | 694 | { |
342cd0ab CD |
695 | pgd_t *pgd; |
696 | pud_t *pud; | |
342cd0ab CD |
697 | unsigned long addr, next; |
698 | int err = 0; | |
699 | ||
342cd0ab | 700 | mutex_lock(&kvm_hyp_pgd_mutex); |
3562c76d MZ |
701 | addr = start & PAGE_MASK; |
702 | end = PAGE_ALIGN(end); | |
703 | do { | |
3ddd4556 | 704 | pgd = pgdp + kvm_pgd_index(addr, ptrs_per_pgd); |
342cd0ab | 705 | |
38f791a4 CD |
706 | if (pgd_none(*pgd)) { |
707 | pud = pud_alloc_one(NULL, addr); | |
708 | if (!pud) { | |
709 | kvm_err("Cannot allocate Hyp pud\n"); | |
342cd0ab CD |
710 | err = -ENOMEM; |
711 | goto out; | |
712 | } | |
0db9dd8a | 713 | kvm_pgd_populate(pgd, pud); |
38f791a4 | 714 | get_page(virt_to_page(pgd)); |
342cd0ab CD |
715 | } |
716 | ||
717 | next = pgd_addr_end(addr, end); | |
38f791a4 | 718 | err = create_hyp_pud_mappings(pgd, addr, next, pfn, prot); |
342cd0ab CD |
719 | if (err) |
720 | goto out; | |
6060df84 | 721 | pfn += (next - addr) >> PAGE_SHIFT; |
3562c76d | 722 | } while (addr = next, addr != end); |
342cd0ab CD |
723 | out: |
724 | mutex_unlock(&kvm_hyp_pgd_mutex); | |
725 | return err; | |
726 | } | |
727 | ||
40c2729b CD |
728 | static phys_addr_t kvm_kaddr_to_phys(void *kaddr) |
729 | { | |
730 | if (!is_vmalloc_addr(kaddr)) { | |
731 | BUG_ON(!virt_addr_valid(kaddr)); | |
732 | return __pa(kaddr); | |
733 | } else { | |
734 | return page_to_phys(vmalloc_to_page(kaddr)) + | |
735 | offset_in_page(kaddr); | |
736 | } | |
737 | } | |
738 | ||
342cd0ab | 739 | /** |
06e8c3b0 | 740 | * create_hyp_mappings - duplicate a kernel virtual address range in Hyp mode |
342cd0ab CD |
741 | * @from: The virtual kernel start address of the range |
742 | * @to: The virtual kernel end address of the range (exclusive) | |
c8dddecd | 743 | * @prot: The protection to be applied to this range |
342cd0ab | 744 | * |
06e8c3b0 MZ |
745 | * The same virtual address as the kernel virtual address is also used |
746 | * in Hyp-mode mapping (modulo HYP_PAGE_OFFSET) to the same underlying | |
747 | * physical pages. | |
342cd0ab | 748 | */ |
c8dddecd | 749 | int create_hyp_mappings(void *from, void *to, pgprot_t prot) |
342cd0ab | 750 | { |
40c2729b CD |
751 | phys_addr_t phys_addr; |
752 | unsigned long virt_addr; | |
6c41a413 MZ |
753 | unsigned long start = kern_hyp_va((unsigned long)from); |
754 | unsigned long end = kern_hyp_va((unsigned long)to); | |
6060df84 | 755 | |
1e947bad MZ |
756 | if (is_kernel_in_hyp_mode()) |
757 | return 0; | |
758 | ||
40c2729b CD |
759 | start = start & PAGE_MASK; |
760 | end = PAGE_ALIGN(end); | |
6060df84 | 761 | |
40c2729b CD |
762 | for (virt_addr = start; virt_addr < end; virt_addr += PAGE_SIZE) { |
763 | int err; | |
6060df84 | 764 | |
40c2729b | 765 | phys_addr = kvm_kaddr_to_phys(from + virt_addr - start); |
98732d1b KM |
766 | err = __create_hyp_mappings(hyp_pgd, PTRS_PER_PGD, |
767 | virt_addr, virt_addr + PAGE_SIZE, | |
40c2729b | 768 | __phys_to_pfn(phys_addr), |
c8dddecd | 769 | prot); |
40c2729b CD |
770 | if (err) |
771 | return err; | |
772 | } | |
773 | ||
774 | return 0; | |
342cd0ab CD |
775 | } |
776 | ||
dc2e4633 MZ |
777 | static int __create_hyp_private_mapping(phys_addr_t phys_addr, size_t size, |
778 | unsigned long *haddr, pgprot_t prot) | |
342cd0ab | 779 | { |
e3f019b3 MZ |
780 | pgd_t *pgd = hyp_pgd; |
781 | unsigned long base; | |
782 | int ret = 0; | |
6060df84 | 783 | |
e3f019b3 | 784 | mutex_lock(&kvm_hyp_pgd_mutex); |
6060df84 | 785 | |
e3f019b3 MZ |
786 | /* |
787 | * This assumes that we we have enough space below the idmap | |
788 | * page to allocate our VAs. If not, the check below will | |
789 | * kick. A potential alternative would be to detect that | |
790 | * overflow and switch to an allocation above the idmap. | |
791 | * | |
792 | * The allocated size is always a multiple of PAGE_SIZE. | |
793 | */ | |
794 | size = PAGE_ALIGN(size + offset_in_page(phys_addr)); | |
795 | base = io_map_base - size; | |
1bb32a44 | 796 | |
e3f019b3 MZ |
797 | /* |
798 | * Verify that BIT(VA_BITS - 1) hasn't been flipped by | |
799 | * allocating the new area, as it would indicate we've | |
800 | * overflowed the idmap/IO address range. | |
801 | */ | |
802 | if ((base ^ io_map_base) & BIT(VA_BITS - 1)) | |
803 | ret = -ENOMEM; | |
804 | else | |
805 | io_map_base = base; | |
806 | ||
807 | mutex_unlock(&kvm_hyp_pgd_mutex); | |
808 | ||
809 | if (ret) | |
810 | goto out; | |
811 | ||
812 | if (__kvm_cpu_uses_extended_idmap()) | |
813 | pgd = boot_hyp_pgd; | |
814 | ||
815 | ret = __create_hyp_mappings(pgd, __kvm_idmap_ptrs_per_pgd(), | |
816 | base, base + size, | |
dc2e4633 | 817 | __phys_to_pfn(phys_addr), prot); |
e3f019b3 MZ |
818 | if (ret) |
819 | goto out; | |
820 | ||
dc2e4633 | 821 | *haddr = base + offset_in_page(phys_addr); |
e3f019b3 MZ |
822 | |
823 | out: | |
dc2e4633 MZ |
824 | return ret; |
825 | } | |
826 | ||
827 | /** | |
828 | * create_hyp_io_mappings - Map IO into both kernel and HYP | |
829 | * @phys_addr: The physical start address which gets mapped | |
830 | * @size: Size of the region being mapped | |
831 | * @kaddr: Kernel VA for this mapping | |
832 | * @haddr: HYP VA for this mapping | |
833 | */ | |
834 | int create_hyp_io_mappings(phys_addr_t phys_addr, size_t size, | |
835 | void __iomem **kaddr, | |
836 | void __iomem **haddr) | |
837 | { | |
838 | unsigned long addr; | |
839 | int ret; | |
840 | ||
841 | *kaddr = ioremap(phys_addr, size); | |
842 | if (!*kaddr) | |
843 | return -ENOMEM; | |
844 | ||
845 | if (is_kernel_in_hyp_mode()) { | |
846 | *haddr = *kaddr; | |
847 | return 0; | |
848 | } | |
849 | ||
850 | ret = __create_hyp_private_mapping(phys_addr, size, | |
851 | &addr, PAGE_HYP_DEVICE); | |
1bb32a44 MZ |
852 | if (ret) { |
853 | iounmap(*kaddr); | |
854 | *kaddr = NULL; | |
dc2e4633 MZ |
855 | *haddr = NULL; |
856 | return ret; | |
857 | } | |
858 | ||
859 | *haddr = (void __iomem *)addr; | |
860 | return 0; | |
861 | } | |
862 | ||
863 | /** | |
864 | * create_hyp_exec_mappings - Map an executable range into HYP | |
865 | * @phys_addr: The physical start address which gets mapped | |
866 | * @size: Size of the region being mapped | |
867 | * @haddr: HYP VA for this mapping | |
868 | */ | |
869 | int create_hyp_exec_mappings(phys_addr_t phys_addr, size_t size, | |
870 | void **haddr) | |
871 | { | |
872 | unsigned long addr; | |
873 | int ret; | |
874 | ||
875 | BUG_ON(is_kernel_in_hyp_mode()); | |
876 | ||
877 | ret = __create_hyp_private_mapping(phys_addr, size, | |
878 | &addr, PAGE_HYP_EXEC); | |
879 | if (ret) { | |
880 | *haddr = NULL; | |
1bb32a44 MZ |
881 | return ret; |
882 | } | |
883 | ||
dc2e4633 | 884 | *haddr = (void *)addr; |
1bb32a44 | 885 | return 0; |
342cd0ab CD |
886 | } |
887 | ||
d5d8184d CD |
888 | /** |
889 | * kvm_alloc_stage2_pgd - allocate level-1 table for stage-2 translation. | |
890 | * @kvm: The KVM struct pointer for the VM. | |
891 | * | |
8324c3d5 ZY |
892 | * Allocates only the stage-2 HW PGD level table(s) of size defined by |
893 | * stage2_pgd_size(kvm). | |
d5d8184d CD |
894 | * |
895 | * Note we don't need locking here as this is only called when the VM is | |
896 | * created, which can only be done once. | |
897 | */ | |
898 | int kvm_alloc_stage2_pgd(struct kvm *kvm) | |
899 | { | |
e329fb75 | 900 | phys_addr_t pgd_phys; |
d5d8184d CD |
901 | pgd_t *pgd; |
902 | ||
903 | if (kvm->arch.pgd != NULL) { | |
904 | kvm_err("kvm_arch already initialized?\n"); | |
905 | return -EINVAL; | |
906 | } | |
907 | ||
9163ee23 | 908 | /* Allocate the HW PGD, making sure that each page gets its own refcount */ |
e55cac5b | 909 | pgd = alloc_pages_exact(stage2_pgd_size(kvm), GFP_KERNEL | __GFP_ZERO); |
9163ee23 | 910 | if (!pgd) |
a987370f MZ |
911 | return -ENOMEM; |
912 | ||
e329fb75 CD |
913 | pgd_phys = virt_to_phys(pgd); |
914 | if (WARN_ON(pgd_phys & ~kvm_vttbr_baddr_mask(kvm))) | |
915 | return -EINVAL; | |
916 | ||
d5d8184d | 917 | kvm->arch.pgd = pgd; |
e329fb75 | 918 | kvm->arch.pgd_phys = pgd_phys; |
d5d8184d CD |
919 | return 0; |
920 | } | |
921 | ||
957db105 CD |
922 | static void stage2_unmap_memslot(struct kvm *kvm, |
923 | struct kvm_memory_slot *memslot) | |
924 | { | |
925 | hva_t hva = memslot->userspace_addr; | |
926 | phys_addr_t addr = memslot->base_gfn << PAGE_SHIFT; | |
927 | phys_addr_t size = PAGE_SIZE * memslot->npages; | |
928 | hva_t reg_end = hva + size; | |
929 | ||
930 | /* | |
931 | * A memory region could potentially cover multiple VMAs, and any holes | |
932 | * between them, so iterate over all of them to find out if we should | |
933 | * unmap any of them. | |
934 | * | |
935 | * +--------------------------------------------+ | |
936 | * +---------------+----------------+ +----------------+ | |
937 | * | : VMA 1 | VMA 2 | | VMA 3 : | | |
938 | * +---------------+----------------+ +----------------+ | |
939 | * | memory region | | |
940 | * +--------------------------------------------+ | |
941 | */ | |
942 | do { | |
943 | struct vm_area_struct *vma = find_vma(current->mm, hva); | |
944 | hva_t vm_start, vm_end; | |
945 | ||
946 | if (!vma || vma->vm_start >= reg_end) | |
947 | break; | |
948 | ||
949 | /* | |
950 | * Take the intersection of this VMA with the memory region | |
951 | */ | |
952 | vm_start = max(hva, vma->vm_start); | |
953 | vm_end = min(reg_end, vma->vm_end); | |
954 | ||
955 | if (!(vma->vm_flags & VM_PFNMAP)) { | |
956 | gpa_t gpa = addr + (vm_start - memslot->userspace_addr); | |
957 | unmap_stage2_range(kvm, gpa, vm_end - vm_start); | |
958 | } | |
959 | hva = vm_end; | |
960 | } while (hva < reg_end); | |
961 | } | |
962 | ||
963 | /** | |
964 | * stage2_unmap_vm - Unmap Stage-2 RAM mappings | |
965 | * @kvm: The struct kvm pointer | |
966 | * | |
967 | * Go through the memregions and unmap any reguler RAM | |
968 | * backing memory already mapped to the VM. | |
969 | */ | |
970 | void stage2_unmap_vm(struct kvm *kvm) | |
971 | { | |
972 | struct kvm_memslots *slots; | |
973 | struct kvm_memory_slot *memslot; | |
974 | int idx; | |
975 | ||
976 | idx = srcu_read_lock(&kvm->srcu); | |
90f6e150 | 977 | down_read(¤t->mm->mmap_sem); |
957db105 CD |
978 | spin_lock(&kvm->mmu_lock); |
979 | ||
980 | slots = kvm_memslots(kvm); | |
981 | kvm_for_each_memslot(memslot, slots) | |
982 | stage2_unmap_memslot(kvm, memslot); | |
983 | ||
984 | spin_unlock(&kvm->mmu_lock); | |
90f6e150 | 985 | up_read(¤t->mm->mmap_sem); |
957db105 CD |
986 | srcu_read_unlock(&kvm->srcu, idx); |
987 | } | |
988 | ||
d5d8184d CD |
989 | /** |
990 | * kvm_free_stage2_pgd - free all stage-2 tables | |
991 | * @kvm: The KVM struct pointer for the VM. | |
992 | * | |
993 | * Walks the level-1 page table pointed to by kvm->arch.pgd and frees all | |
994 | * underlying level-2 and level-3 tables before freeing the actual level-1 table | |
995 | * and setting the struct pointer to NULL. | |
d5d8184d CD |
996 | */ |
997 | void kvm_free_stage2_pgd(struct kvm *kvm) | |
998 | { | |
6c0d706b | 999 | void *pgd = NULL; |
d5d8184d | 1000 | |
8b3405e3 | 1001 | spin_lock(&kvm->mmu_lock); |
6c0d706b | 1002 | if (kvm->arch.pgd) { |
e55cac5b | 1003 | unmap_stage2_range(kvm, 0, kvm_phys_size(kvm)); |
2952a607 | 1004 | pgd = READ_ONCE(kvm->arch.pgd); |
6c0d706b | 1005 | kvm->arch.pgd = NULL; |
e329fb75 | 1006 | kvm->arch.pgd_phys = 0; |
6c0d706b | 1007 | } |
8b3405e3 SP |
1008 | spin_unlock(&kvm->mmu_lock); |
1009 | ||
9163ee23 | 1010 | /* Free the HW pgd, one page at a time */ |
6c0d706b | 1011 | if (pgd) |
e55cac5b | 1012 | free_pages_exact(pgd, stage2_pgd_size(kvm)); |
d5d8184d CD |
1013 | } |
1014 | ||
38f791a4 | 1015 | static pud_t *stage2_get_pud(struct kvm *kvm, struct kvm_mmu_memory_cache *cache, |
ad361f09 | 1016 | phys_addr_t addr) |
d5d8184d CD |
1017 | { |
1018 | pgd_t *pgd; | |
1019 | pud_t *pud; | |
d5d8184d | 1020 | |
e55cac5b SP |
1021 | pgd = kvm->arch.pgd + stage2_pgd_index(kvm, addr); |
1022 | if (stage2_pgd_none(kvm, *pgd)) { | |
38f791a4 CD |
1023 | if (!cache) |
1024 | return NULL; | |
1025 | pud = mmu_memory_cache_alloc(cache); | |
e55cac5b | 1026 | stage2_pgd_populate(kvm, pgd, pud); |
38f791a4 CD |
1027 | get_page(virt_to_page(pgd)); |
1028 | } | |
1029 | ||
e55cac5b | 1030 | return stage2_pud_offset(kvm, pgd, addr); |
38f791a4 CD |
1031 | } |
1032 | ||
1033 | static pmd_t *stage2_get_pmd(struct kvm *kvm, struct kvm_mmu_memory_cache *cache, | |
1034 | phys_addr_t addr) | |
1035 | { | |
1036 | pud_t *pud; | |
1037 | pmd_t *pmd; | |
1038 | ||
1039 | pud = stage2_get_pud(kvm, cache, addr); | |
b8e0ba7c | 1040 | if (!pud || stage2_pud_huge(kvm, *pud)) |
d6dbdd3c MZ |
1041 | return NULL; |
1042 | ||
e55cac5b | 1043 | if (stage2_pud_none(kvm, *pud)) { |
d5d8184d | 1044 | if (!cache) |
ad361f09 | 1045 | return NULL; |
d5d8184d | 1046 | pmd = mmu_memory_cache_alloc(cache); |
e55cac5b | 1047 | stage2_pud_populate(kvm, pud, pmd); |
d5d8184d | 1048 | get_page(virt_to_page(pud)); |
c62ee2b2 MZ |
1049 | } |
1050 | ||
e55cac5b | 1051 | return stage2_pmd_offset(kvm, pud, addr); |
ad361f09 CD |
1052 | } |
1053 | ||
1054 | static int stage2_set_pmd_huge(struct kvm *kvm, struct kvm_mmu_memory_cache | |
1055 | *cache, phys_addr_t addr, const pmd_t *new_pmd) | |
1056 | { | |
1057 | pmd_t *pmd, old_pmd; | |
1058 | ||
3c3736cd | 1059 | retry: |
ad361f09 CD |
1060 | pmd = stage2_get_pmd(kvm, cache, addr); |
1061 | VM_BUG_ON(!pmd); | |
d5d8184d | 1062 | |
ad361f09 | 1063 | old_pmd = *pmd; |
3c3736cd SP |
1064 | /* |
1065 | * Multiple vcpus faulting on the same PMD entry, can | |
1066 | * lead to them sequentially updating the PMD with the | |
1067 | * same value. Following the break-before-make | |
1068 | * (pmd_clear() followed by tlb_flush()) process can | |
1069 | * hinder forward progress due to refaults generated | |
1070 | * on missing translations. | |
1071 | * | |
1072 | * Skip updating the page table if the entry is | |
1073 | * unchanged. | |
1074 | */ | |
1075 | if (pmd_val(old_pmd) == pmd_val(*new_pmd)) | |
1076 | return 0; | |
1077 | ||
d4b9e079 | 1078 | if (pmd_present(old_pmd)) { |
86658b81 | 1079 | /* |
3c3736cd SP |
1080 | * If we already have PTE level mapping for this block, |
1081 | * we must unmap it to avoid inconsistent TLB state and | |
1082 | * leaking the table page. We could end up in this situation | |
1083 | * if the memory slot was marked for dirty logging and was | |
1084 | * reverted, leaving PTE level mappings for the pages accessed | |
1085 | * during the period. So, unmap the PTE level mapping for this | |
1086 | * block and retry, as we could have released the upper level | |
1087 | * table in the process. | |
86658b81 | 1088 | * |
3c3736cd SP |
1089 | * Normal THP split/merge follows mmu_notifier callbacks and do |
1090 | * get handled accordingly. | |
86658b81 | 1091 | */ |
3c3736cd SP |
1092 | if (!pmd_thp_or_huge(old_pmd)) { |
1093 | unmap_stage2_range(kvm, addr & S2_PMD_MASK, S2_PMD_SIZE); | |
1094 | goto retry; | |
1095 | } | |
86658b81 PA |
1096 | /* |
1097 | * Mapping in huge pages should only happen through a | |
1098 | * fault. If a page is merged into a transparent huge | |
1099 | * page, the individual subpages of that huge page | |
1100 | * should be unmapped through MMU notifiers before we | |
1101 | * get here. | |
1102 | * | |
1103 | * Merging of CompoundPages is not supported; they | |
1104 | * should become splitting first, unmapped, merged, | |
1105 | * and mapped back in on-demand. | |
1106 | */ | |
3c3736cd | 1107 | WARN_ON_ONCE(pmd_pfn(old_pmd) != pmd_pfn(*new_pmd)); |
d4b9e079 | 1108 | pmd_clear(pmd); |
ad361f09 | 1109 | kvm_tlb_flush_vmid_ipa(kvm, addr); |
d4b9e079 | 1110 | } else { |
ad361f09 | 1111 | get_page(virt_to_page(pmd)); |
d4b9e079 MZ |
1112 | } |
1113 | ||
1114 | kvm_set_pmd(pmd, *new_pmd); | |
ad361f09 CD |
1115 | return 0; |
1116 | } | |
1117 | ||
b8e0ba7c PA |
1118 | static int stage2_set_pud_huge(struct kvm *kvm, struct kvm_mmu_memory_cache *cache, |
1119 | phys_addr_t addr, const pud_t *new_pudp) | |
1120 | { | |
1121 | pud_t *pudp, old_pud; | |
1122 | ||
3c3736cd | 1123 | retry: |
b8e0ba7c PA |
1124 | pudp = stage2_get_pud(kvm, cache, addr); |
1125 | VM_BUG_ON(!pudp); | |
1126 | ||
1127 | old_pud = *pudp; | |
1128 | ||
1129 | /* | |
1130 | * A large number of vcpus faulting on the same stage 2 entry, | |
3c3736cd SP |
1131 | * can lead to a refault due to the stage2_pud_clear()/tlb_flush(). |
1132 | * Skip updating the page tables if there is no change. | |
b8e0ba7c PA |
1133 | */ |
1134 | if (pud_val(old_pud) == pud_val(*new_pudp)) | |
1135 | return 0; | |
1136 | ||
1137 | if (stage2_pud_present(kvm, old_pud)) { | |
3c3736cd SP |
1138 | /* |
1139 | * If we already have table level mapping for this block, unmap | |
1140 | * the range for this block and retry. | |
1141 | */ | |
1142 | if (!stage2_pud_huge(kvm, old_pud)) { | |
1143 | unmap_stage2_range(kvm, addr & S2_PUD_MASK, S2_PUD_SIZE); | |
1144 | goto retry; | |
1145 | } | |
1146 | ||
1147 | WARN_ON_ONCE(kvm_pud_pfn(old_pud) != kvm_pud_pfn(*new_pudp)); | |
b8e0ba7c PA |
1148 | stage2_pud_clear(kvm, pudp); |
1149 | kvm_tlb_flush_vmid_ipa(kvm, addr); | |
1150 | } else { | |
1151 | get_page(virt_to_page(pudp)); | |
1152 | } | |
1153 | ||
1154 | kvm_set_pud(pudp, *new_pudp); | |
1155 | return 0; | |
1156 | } | |
1157 | ||
86d1c55e PA |
1158 | /* |
1159 | * stage2_get_leaf_entry - walk the stage2 VM page tables and return | |
1160 | * true if a valid and present leaf-entry is found. A pointer to the | |
1161 | * leaf-entry is returned in the appropriate level variable - pudpp, | |
1162 | * pmdpp, ptepp. | |
1163 | */ | |
1164 | static bool stage2_get_leaf_entry(struct kvm *kvm, phys_addr_t addr, | |
1165 | pud_t **pudpp, pmd_t **pmdpp, pte_t **ptepp) | |
7a3796d2 | 1166 | { |
86d1c55e | 1167 | pud_t *pudp; |
7a3796d2 MZ |
1168 | pmd_t *pmdp; |
1169 | pte_t *ptep; | |
1170 | ||
86d1c55e PA |
1171 | *pudpp = NULL; |
1172 | *pmdpp = NULL; | |
1173 | *ptepp = NULL; | |
1174 | ||
1175 | pudp = stage2_get_pud(kvm, NULL, addr); | |
1176 | if (!pudp || stage2_pud_none(kvm, *pudp) || !stage2_pud_present(kvm, *pudp)) | |
1177 | return false; | |
1178 | ||
1179 | if (stage2_pud_huge(kvm, *pudp)) { | |
1180 | *pudpp = pudp; | |
1181 | return true; | |
1182 | } | |
1183 | ||
1184 | pmdp = stage2_pmd_offset(kvm, pudp, addr); | |
7a3796d2 MZ |
1185 | if (!pmdp || pmd_none(*pmdp) || !pmd_present(*pmdp)) |
1186 | return false; | |
1187 | ||
86d1c55e PA |
1188 | if (pmd_thp_or_huge(*pmdp)) { |
1189 | *pmdpp = pmdp; | |
1190 | return true; | |
1191 | } | |
7a3796d2 MZ |
1192 | |
1193 | ptep = pte_offset_kernel(pmdp, addr); | |
1194 | if (!ptep || pte_none(*ptep) || !pte_present(*ptep)) | |
1195 | return false; | |
1196 | ||
86d1c55e PA |
1197 | *ptepp = ptep; |
1198 | return true; | |
1199 | } | |
1200 | ||
1201 | static bool stage2_is_exec(struct kvm *kvm, phys_addr_t addr) | |
1202 | { | |
1203 | pud_t *pudp; | |
1204 | pmd_t *pmdp; | |
1205 | pte_t *ptep; | |
1206 | bool found; | |
1207 | ||
1208 | found = stage2_get_leaf_entry(kvm, addr, &pudp, &pmdp, &ptep); | |
1209 | if (!found) | |
1210 | return false; | |
1211 | ||
1212 | if (pudp) | |
1213 | return kvm_s2pud_exec(pudp); | |
1214 | else if (pmdp) | |
1215 | return kvm_s2pmd_exec(pmdp); | |
1216 | else | |
1217 | return kvm_s2pte_exec(ptep); | |
7a3796d2 MZ |
1218 | } |
1219 | ||
ad361f09 | 1220 | static int stage2_set_pte(struct kvm *kvm, struct kvm_mmu_memory_cache *cache, |
15a49a44 MS |
1221 | phys_addr_t addr, const pte_t *new_pte, |
1222 | unsigned long flags) | |
ad361f09 | 1223 | { |
b8e0ba7c | 1224 | pud_t *pud; |
ad361f09 CD |
1225 | pmd_t *pmd; |
1226 | pte_t *pte, old_pte; | |
15a49a44 MS |
1227 | bool iomap = flags & KVM_S2PTE_FLAG_IS_IOMAP; |
1228 | bool logging_active = flags & KVM_S2_FLAG_LOGGING_ACTIVE; | |
1229 | ||
1230 | VM_BUG_ON(logging_active && !cache); | |
ad361f09 | 1231 | |
38f791a4 | 1232 | /* Create stage-2 page table mapping - Levels 0 and 1 */ |
b8e0ba7c PA |
1233 | pud = stage2_get_pud(kvm, cache, addr); |
1234 | if (!pud) { | |
1235 | /* | |
1236 | * Ignore calls from kvm_set_spte_hva for unallocated | |
1237 | * address ranges. | |
1238 | */ | |
1239 | return 0; | |
1240 | } | |
1241 | ||
1242 | /* | |
1243 | * While dirty page logging - dissolve huge PUD, then continue | |
1244 | * on to allocate page. | |
1245 | */ | |
1246 | if (logging_active) | |
1247 | stage2_dissolve_pud(kvm, addr, pud); | |
1248 | ||
1249 | if (stage2_pud_none(kvm, *pud)) { | |
1250 | if (!cache) | |
1251 | return 0; /* ignore calls from kvm_set_spte_hva */ | |
1252 | pmd = mmu_memory_cache_alloc(cache); | |
1253 | stage2_pud_populate(kvm, pud, pmd); | |
1254 | get_page(virt_to_page(pud)); | |
1255 | } | |
1256 | ||
1257 | pmd = stage2_pmd_offset(kvm, pud, addr); | |
ad361f09 CD |
1258 | if (!pmd) { |
1259 | /* | |
1260 | * Ignore calls from kvm_set_spte_hva for unallocated | |
1261 | * address ranges. | |
1262 | */ | |
1263 | return 0; | |
1264 | } | |
1265 | ||
15a49a44 MS |
1266 | /* |
1267 | * While dirty page logging - dissolve huge PMD, then continue on to | |
1268 | * allocate page. | |
1269 | */ | |
1270 | if (logging_active) | |
1271 | stage2_dissolve_pmd(kvm, addr, pmd); | |
1272 | ||
ad361f09 | 1273 | /* Create stage-2 page mappings - Level 2 */ |
d5d8184d CD |
1274 | if (pmd_none(*pmd)) { |
1275 | if (!cache) | |
1276 | return 0; /* ignore calls from kvm_set_spte_hva */ | |
1277 | pte = mmu_memory_cache_alloc(cache); | |
0db9dd8a | 1278 | kvm_pmd_populate(pmd, pte); |
d5d8184d | 1279 | get_page(virt_to_page(pmd)); |
c62ee2b2 MZ |
1280 | } |
1281 | ||
1282 | pte = pte_offset_kernel(pmd, addr); | |
d5d8184d CD |
1283 | |
1284 | if (iomap && pte_present(*pte)) | |
1285 | return -EFAULT; | |
1286 | ||
1287 | /* Create 2nd stage page table mapping - Level 3 */ | |
1288 | old_pte = *pte; | |
d4b9e079 | 1289 | if (pte_present(old_pte)) { |
976d34e2 PA |
1290 | /* Skip page table update if there is no change */ |
1291 | if (pte_val(old_pte) == pte_val(*new_pte)) | |
1292 | return 0; | |
1293 | ||
d4b9e079 | 1294 | kvm_set_pte(pte, __pte(0)); |
48762767 | 1295 | kvm_tlb_flush_vmid_ipa(kvm, addr); |
d4b9e079 | 1296 | } else { |
d5d8184d | 1297 | get_page(virt_to_page(pte)); |
d4b9e079 | 1298 | } |
d5d8184d | 1299 | |
d4b9e079 | 1300 | kvm_set_pte(pte, *new_pte); |
d5d8184d CD |
1301 | return 0; |
1302 | } | |
d5d8184d | 1303 | |
06485053 CM |
1304 | #ifndef __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG |
1305 | static int stage2_ptep_test_and_clear_young(pte_t *pte) | |
1306 | { | |
1307 | if (pte_young(*pte)) { | |
1308 | *pte = pte_mkold(*pte); | |
1309 | return 1; | |
1310 | } | |
d5d8184d CD |
1311 | return 0; |
1312 | } | |
06485053 CM |
1313 | #else |
1314 | static int stage2_ptep_test_and_clear_young(pte_t *pte) | |
1315 | { | |
1316 | return __ptep_test_and_clear_young(pte); | |
1317 | } | |
1318 | #endif | |
1319 | ||
1320 | static int stage2_pmdp_test_and_clear_young(pmd_t *pmd) | |
1321 | { | |
1322 | return stage2_ptep_test_and_clear_young((pte_t *)pmd); | |
1323 | } | |
d5d8184d | 1324 | |
35a63966 PA |
1325 | static int stage2_pudp_test_and_clear_young(pud_t *pud) |
1326 | { | |
1327 | return stage2_ptep_test_and_clear_young((pte_t *)pud); | |
1328 | } | |
1329 | ||
d5d8184d CD |
1330 | /** |
1331 | * kvm_phys_addr_ioremap - map a device range to guest IPA | |
1332 | * | |
1333 | * @kvm: The KVM pointer | |
1334 | * @guest_ipa: The IPA at which to insert the mapping | |
1335 | * @pa: The physical address of the device | |
1336 | * @size: The size of the mapping | |
1337 | */ | |
1338 | int kvm_phys_addr_ioremap(struct kvm *kvm, phys_addr_t guest_ipa, | |
c40f2f8f | 1339 | phys_addr_t pa, unsigned long size, bool writable) |
d5d8184d CD |
1340 | { |
1341 | phys_addr_t addr, end; | |
1342 | int ret = 0; | |
1343 | unsigned long pfn; | |
1344 | struct kvm_mmu_memory_cache cache = { 0, }; | |
1345 | ||
1346 | end = (guest_ipa + size + PAGE_SIZE - 1) & PAGE_MASK; | |
1347 | pfn = __phys_to_pfn(pa); | |
1348 | ||
1349 | for (addr = guest_ipa; addr < end; addr += PAGE_SIZE) { | |
f8df7338 | 1350 | pte_t pte = kvm_pfn_pte(pfn, PAGE_S2_DEVICE); |
d5d8184d | 1351 | |
c40f2f8f | 1352 | if (writable) |
06485053 | 1353 | pte = kvm_s2pte_mkwrite(pte); |
c40f2f8f | 1354 | |
e55cac5b SP |
1355 | ret = mmu_topup_memory_cache(&cache, |
1356 | kvm_mmu_cache_min_pages(kvm), | |
1357 | KVM_NR_MEM_OBJS); | |
d5d8184d CD |
1358 | if (ret) |
1359 | goto out; | |
1360 | spin_lock(&kvm->mmu_lock); | |
15a49a44 MS |
1361 | ret = stage2_set_pte(kvm, &cache, addr, &pte, |
1362 | KVM_S2PTE_FLAG_IS_IOMAP); | |
d5d8184d CD |
1363 | spin_unlock(&kvm->mmu_lock); |
1364 | if (ret) | |
1365 | goto out; | |
1366 | ||
1367 | pfn++; | |
1368 | } | |
1369 | ||
1370 | out: | |
1371 | mmu_free_memory_cache(&cache); | |
1372 | return ret; | |
1373 | } | |
1374 | ||
ba049e93 | 1375 | static bool transparent_hugepage_adjust(kvm_pfn_t *pfnp, phys_addr_t *ipap) |
9b5fdb97 | 1376 | { |
ba049e93 | 1377 | kvm_pfn_t pfn = *pfnp; |
9b5fdb97 CD |
1378 | gfn_t gfn = *ipap >> PAGE_SHIFT; |
1379 | ||
005ba37c | 1380 | if (kvm_is_transparent_hugepage(pfn)) { |
9b5fdb97 CD |
1381 | unsigned long mask; |
1382 | /* | |
1383 | * The address we faulted on is backed by a transparent huge | |
1384 | * page. However, because we map the compound huge page and | |
1385 | * not the individual tail page, we need to transfer the | |
1386 | * refcount to the head page. We have to be careful that the | |
1387 | * THP doesn't start to split while we are adjusting the | |
1388 | * refcounts. | |
1389 | * | |
1390 | * We are sure this doesn't happen, because mmu_notifier_retry | |
1391 | * was successful and we are holding the mmu_lock, so if this | |
1392 | * THP is trying to split, it will be blocked in the mmu | |
1393 | * notifier before touching any of the pages, specifically | |
1394 | * before being able to call __split_huge_page_refcount(). | |
1395 | * | |
1396 | * We can therefore safely transfer the refcount from PG_tail | |
1397 | * to PG_head and switch the pfn from a tail page to the head | |
1398 | * page accordingly. | |
1399 | */ | |
1400 | mask = PTRS_PER_PMD - 1; | |
1401 | VM_BUG_ON((gfn & mask) != (pfn & mask)); | |
1402 | if (pfn & mask) { | |
1403 | *ipap &= PMD_MASK; | |
1404 | kvm_release_pfn_clean(pfn); | |
1405 | pfn &= ~mask; | |
1406 | kvm_get_pfn(pfn); | |
1407 | *pfnp = pfn; | |
1408 | } | |
1409 | ||
1410 | return true; | |
1411 | } | |
1412 | ||
1413 | return false; | |
1414 | } | |
1415 | ||
c6473555 MS |
1416 | /** |
1417 | * stage2_wp_ptes - write protect PMD range | |
1418 | * @pmd: pointer to pmd entry | |
1419 | * @addr: range start address | |
1420 | * @end: range end address | |
1421 | */ | |
1422 | static void stage2_wp_ptes(pmd_t *pmd, phys_addr_t addr, phys_addr_t end) | |
1423 | { | |
1424 | pte_t *pte; | |
1425 | ||
1426 | pte = pte_offset_kernel(pmd, addr); | |
1427 | do { | |
1428 | if (!pte_none(*pte)) { | |
1429 | if (!kvm_s2pte_readonly(pte)) | |
1430 | kvm_set_s2pte_readonly(pte); | |
1431 | } | |
1432 | } while (pte++, addr += PAGE_SIZE, addr != end); | |
1433 | } | |
1434 | ||
1435 | /** | |
1436 | * stage2_wp_pmds - write protect PUD range | |
e55cac5b | 1437 | * kvm: kvm instance for the VM |
c6473555 MS |
1438 | * @pud: pointer to pud entry |
1439 | * @addr: range start address | |
1440 | * @end: range end address | |
1441 | */ | |
e55cac5b SP |
1442 | static void stage2_wp_pmds(struct kvm *kvm, pud_t *pud, |
1443 | phys_addr_t addr, phys_addr_t end) | |
c6473555 MS |
1444 | { |
1445 | pmd_t *pmd; | |
1446 | phys_addr_t next; | |
1447 | ||
e55cac5b | 1448 | pmd = stage2_pmd_offset(kvm, pud, addr); |
c6473555 MS |
1449 | |
1450 | do { | |
e55cac5b | 1451 | next = stage2_pmd_addr_end(kvm, addr, end); |
c6473555 | 1452 | if (!pmd_none(*pmd)) { |
bbb3b6b3 | 1453 | if (pmd_thp_or_huge(*pmd)) { |
c6473555 MS |
1454 | if (!kvm_s2pmd_readonly(pmd)) |
1455 | kvm_set_s2pmd_readonly(pmd); | |
1456 | } else { | |
1457 | stage2_wp_ptes(pmd, addr, next); | |
1458 | } | |
1459 | } | |
1460 | } while (pmd++, addr = next, addr != end); | |
1461 | } | |
1462 | ||
1463 | /** | |
8324c3d5 ZY |
1464 | * stage2_wp_puds - write protect PGD range |
1465 | * @pgd: pointer to pgd entry | |
1466 | * @addr: range start address | |
1467 | * @end: range end address | |
1468 | */ | |
e55cac5b SP |
1469 | static void stage2_wp_puds(struct kvm *kvm, pgd_t *pgd, |
1470 | phys_addr_t addr, phys_addr_t end) | |
c6473555 MS |
1471 | { |
1472 | pud_t *pud; | |
1473 | phys_addr_t next; | |
1474 | ||
e55cac5b | 1475 | pud = stage2_pud_offset(kvm, pgd, addr); |
c6473555 | 1476 | do { |
e55cac5b SP |
1477 | next = stage2_pud_addr_end(kvm, addr, end); |
1478 | if (!stage2_pud_none(kvm, *pud)) { | |
4ea5af53 PA |
1479 | if (stage2_pud_huge(kvm, *pud)) { |
1480 | if (!kvm_s2pud_readonly(pud)) | |
1481 | kvm_set_s2pud_readonly(pud); | |
1482 | } else { | |
1483 | stage2_wp_pmds(kvm, pud, addr, next); | |
1484 | } | |
c6473555 MS |
1485 | } |
1486 | } while (pud++, addr = next, addr != end); | |
1487 | } | |
1488 | ||
1489 | /** | |
1490 | * stage2_wp_range() - write protect stage2 memory region range | |
1491 | * @kvm: The KVM pointer | |
1492 | * @addr: Start address of range | |
1493 | * @end: End address of range | |
1494 | */ | |
1495 | static void stage2_wp_range(struct kvm *kvm, phys_addr_t addr, phys_addr_t end) | |
1496 | { | |
1497 | pgd_t *pgd; | |
1498 | phys_addr_t next; | |
1499 | ||
e55cac5b | 1500 | pgd = kvm->arch.pgd + stage2_pgd_index(kvm, addr); |
c6473555 MS |
1501 | do { |
1502 | /* | |
1503 | * Release kvm_mmu_lock periodically if the memory region is | |
1504 | * large. Otherwise, we may see kernel panics with | |
227ea818 CD |
1505 | * CONFIG_DETECT_HUNG_TASK, CONFIG_LOCKUP_DETECTOR, |
1506 | * CONFIG_LOCKDEP. Additionally, holding the lock too long | |
0c428a6a SP |
1507 | * will also starve other vCPUs. We have to also make sure |
1508 | * that the page tables are not freed while we released | |
1509 | * the lock. | |
c6473555 | 1510 | */ |
0c428a6a SP |
1511 | cond_resched_lock(&kvm->mmu_lock); |
1512 | if (!READ_ONCE(kvm->arch.pgd)) | |
1513 | break; | |
e55cac5b SP |
1514 | next = stage2_pgd_addr_end(kvm, addr, end); |
1515 | if (stage2_pgd_present(kvm, *pgd)) | |
1516 | stage2_wp_puds(kvm, pgd, addr, next); | |
c6473555 MS |
1517 | } while (pgd++, addr = next, addr != end); |
1518 | } | |
1519 | ||
1520 | /** | |
1521 | * kvm_mmu_wp_memory_region() - write protect stage 2 entries for memory slot | |
1522 | * @kvm: The KVM pointer | |
1523 | * @slot: The memory slot to write protect | |
1524 | * | |
1525 | * Called to start logging dirty pages after memory region | |
1526 | * KVM_MEM_LOG_DIRTY_PAGES operation is called. After this function returns | |
4ea5af53 | 1527 | * all present PUD, PMD and PTEs are write protected in the memory region. |
c6473555 MS |
1528 | * Afterwards read of dirty page log can be called. |
1529 | * | |
1530 | * Acquires kvm_mmu_lock. Called with kvm->slots_lock mutex acquired, | |
1531 | * serializing operations for VM memory regions. | |
1532 | */ | |
1533 | void kvm_mmu_wp_memory_region(struct kvm *kvm, int slot) | |
1534 | { | |
9f6b8029 PB |
1535 | struct kvm_memslots *slots = kvm_memslots(kvm); |
1536 | struct kvm_memory_slot *memslot = id_to_memslot(slots, slot); | |
c6473555 MS |
1537 | phys_addr_t start = memslot->base_gfn << PAGE_SHIFT; |
1538 | phys_addr_t end = (memslot->base_gfn + memslot->npages) << PAGE_SHIFT; | |
1539 | ||
1540 | spin_lock(&kvm->mmu_lock); | |
1541 | stage2_wp_range(kvm, start, end); | |
1542 | spin_unlock(&kvm->mmu_lock); | |
1543 | kvm_flush_remote_tlbs(kvm); | |
1544 | } | |
53c810c3 MS |
1545 | |
1546 | /** | |
3b0f1d01 | 1547 | * kvm_mmu_write_protect_pt_masked() - write protect dirty pages |
53c810c3 MS |
1548 | * @kvm: The KVM pointer |
1549 | * @slot: The memory slot associated with mask | |
1550 | * @gfn_offset: The gfn offset in memory slot | |
1551 | * @mask: The mask of dirty pages at offset 'gfn_offset' in this memory | |
1552 | * slot to be write protected | |
1553 | * | |
1554 | * Walks bits set in mask write protects the associated pte's. Caller must | |
1555 | * acquire kvm_mmu_lock. | |
1556 | */ | |
3b0f1d01 | 1557 | static void kvm_mmu_write_protect_pt_masked(struct kvm *kvm, |
53c810c3 MS |
1558 | struct kvm_memory_slot *slot, |
1559 | gfn_t gfn_offset, unsigned long mask) | |
1560 | { | |
1561 | phys_addr_t base_gfn = slot->base_gfn + gfn_offset; | |
1562 | phys_addr_t start = (base_gfn + __ffs(mask)) << PAGE_SHIFT; | |
1563 | phys_addr_t end = (base_gfn + __fls(mask) + 1) << PAGE_SHIFT; | |
1564 | ||
1565 | stage2_wp_range(kvm, start, end); | |
1566 | } | |
c6473555 | 1567 | |
3b0f1d01 KH |
1568 | /* |
1569 | * kvm_arch_mmu_enable_log_dirty_pt_masked - enable dirty logging for selected | |
1570 | * dirty pages. | |
1571 | * | |
1572 | * It calls kvm_mmu_write_protect_pt_masked to write protect selected pages to | |
1573 | * enable dirty logging for them. | |
1574 | */ | |
1575 | void kvm_arch_mmu_enable_log_dirty_pt_masked(struct kvm *kvm, | |
1576 | struct kvm_memory_slot *slot, | |
1577 | gfn_t gfn_offset, unsigned long mask) | |
1578 | { | |
1579 | kvm_mmu_write_protect_pt_masked(kvm, slot, gfn_offset, mask); | |
1580 | } | |
1581 | ||
17ab9d57 | 1582 | static void clean_dcache_guest_page(kvm_pfn_t pfn, unsigned long size) |
0d3e4d4f | 1583 | { |
17ab9d57 | 1584 | __clean_dcache_guest_page(pfn, size); |
a15f6939 MZ |
1585 | } |
1586 | ||
17ab9d57 | 1587 | static void invalidate_icache_guest_page(kvm_pfn_t pfn, unsigned long size) |
a15f6939 | 1588 | { |
17ab9d57 | 1589 | __invalidate_icache_guest_page(pfn, size); |
0d3e4d4f MZ |
1590 | } |
1591 | ||
1559b758 | 1592 | static void kvm_send_hwpoison_signal(unsigned long address, short lsb) |
196f878a | 1593 | { |
795a8371 | 1594 | send_sig_mceerr(BUS_MCEERR_AR, (void __user *)address, lsb, current); |
196f878a JM |
1595 | } |
1596 | ||
a80868f3 SP |
1597 | static bool fault_supports_stage2_huge_mapping(struct kvm_memory_slot *memslot, |
1598 | unsigned long hva, | |
1599 | unsigned long map_size) | |
6794ad54 | 1600 | { |
c2be79a0 | 1601 | gpa_t gpa_start; |
6794ad54 CD |
1602 | hva_t uaddr_start, uaddr_end; |
1603 | size_t size; | |
1604 | ||
1605 | size = memslot->npages * PAGE_SIZE; | |
1606 | ||
1607 | gpa_start = memslot->base_gfn << PAGE_SHIFT; | |
6794ad54 CD |
1608 | |
1609 | uaddr_start = memslot->userspace_addr; | |
1610 | uaddr_end = uaddr_start + size; | |
1611 | ||
1612 | /* | |
1613 | * Pages belonging to memslots that don't have the same alignment | |
a80868f3 SP |
1614 | * within a PMD/PUD for userspace and IPA cannot be mapped with stage-2 |
1615 | * PMD/PUD entries, because we'll end up mapping the wrong pages. | |
6794ad54 CD |
1616 | * |
1617 | * Consider a layout like the following: | |
1618 | * | |
1619 | * memslot->userspace_addr: | |
1620 | * +-----+--------------------+--------------------+---+ | |
a80868f3 | 1621 | * |abcde|fgh Stage-1 block | Stage-1 block tv|xyz| |
6794ad54 CD |
1622 | * +-----+--------------------+--------------------+---+ |
1623 | * | |
1624 | * memslot->base_gfn << PAGE_SIZE: | |
1625 | * +---+--------------------+--------------------+-----+ | |
a80868f3 | 1626 | * |abc|def Stage-2 block | Stage-2 block |tvxyz| |
6794ad54 CD |
1627 | * +---+--------------------+--------------------+-----+ |
1628 | * | |
a80868f3 | 1629 | * If we create those stage-2 blocks, we'll end up with this incorrect |
6794ad54 CD |
1630 | * mapping: |
1631 | * d -> f | |
1632 | * e -> g | |
1633 | * f -> h | |
1634 | */ | |
a80868f3 | 1635 | if ((gpa_start & (map_size - 1)) != (uaddr_start & (map_size - 1))) |
6794ad54 CD |
1636 | return false; |
1637 | ||
1638 | /* | |
1639 | * Next, let's make sure we're not trying to map anything not covered | |
a80868f3 SP |
1640 | * by the memslot. This means we have to prohibit block size mappings |
1641 | * for the beginning and end of a non-block aligned and non-block sized | |
6794ad54 CD |
1642 | * memory slot (illustrated by the head and tail parts of the |
1643 | * userspace view above containing pages 'abcde' and 'xyz', | |
1644 | * respectively). | |
1645 | * | |
1646 | * Note that it doesn't matter if we do the check using the | |
1647 | * userspace_addr or the base_gfn, as both are equally aligned (per | |
1648 | * the check above) and equally sized. | |
1649 | */ | |
a80868f3 SP |
1650 | return (hva & ~(map_size - 1)) >= uaddr_start && |
1651 | (hva & ~(map_size - 1)) + map_size <= uaddr_end; | |
6794ad54 CD |
1652 | } |
1653 | ||
94f8e641 | 1654 | static int user_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa, |
98047888 | 1655 | struct kvm_memory_slot *memslot, unsigned long hva, |
94f8e641 CD |
1656 | unsigned long fault_status) |
1657 | { | |
94f8e641 | 1658 | int ret; |
6396b852 PA |
1659 | bool write_fault, writable, force_pte = false; |
1660 | bool exec_fault, needs_exec; | |
94f8e641 | 1661 | unsigned long mmu_seq; |
ad361f09 | 1662 | gfn_t gfn = fault_ipa >> PAGE_SHIFT; |
ad361f09 | 1663 | struct kvm *kvm = vcpu->kvm; |
94f8e641 | 1664 | struct kvm_mmu_memory_cache *memcache = &vcpu->arch.mmu_page_cache; |
ad361f09 | 1665 | struct vm_area_struct *vma; |
1559b758 | 1666 | short vma_shift; |
ba049e93 | 1667 | kvm_pfn_t pfn; |
b8865767 | 1668 | pgprot_t mem_type = PAGE_S2; |
15a49a44 | 1669 | bool logging_active = memslot_is_logging(memslot); |
3f58bf63 | 1670 | unsigned long vma_pagesize, flags = 0; |
94f8e641 | 1671 | |
a7d079ce | 1672 | write_fault = kvm_is_write_fault(vcpu); |
d0e22b4a MZ |
1673 | exec_fault = kvm_vcpu_trap_is_iabt(vcpu); |
1674 | VM_BUG_ON(write_fault && exec_fault); | |
1675 | ||
1676 | if (fault_status == FSC_PERM && !write_fault && !exec_fault) { | |
94f8e641 CD |
1677 | kvm_err("Unexpected L2 read permission error\n"); |
1678 | return -EFAULT; | |
1679 | } | |
1680 | ||
ad361f09 CD |
1681 | /* Let's check if we will get back a huge page backed by hugetlbfs */ |
1682 | down_read(¤t->mm->mmap_sem); | |
1683 | vma = find_vma_intersection(current->mm, hva, hva + 1); | |
37b54408 AB |
1684 | if (unlikely(!vma)) { |
1685 | kvm_err("Failed to find VMA for hva 0x%lx\n", hva); | |
1686 | up_read(¤t->mm->mmap_sem); | |
1687 | return -EFAULT; | |
1688 | } | |
1689 | ||
1559b758 JM |
1690 | if (is_vm_hugetlb_page(vma)) |
1691 | vma_shift = huge_page_shift(hstate_vma(vma)); | |
1692 | else | |
1693 | vma_shift = PAGE_SHIFT; | |
1694 | ||
1695 | vma_pagesize = 1ULL << vma_shift; | |
a80868f3 | 1696 | if (logging_active || |
6d674e28 | 1697 | (vma->vm_flags & VM_PFNMAP) || |
a80868f3 SP |
1698 | !fault_supports_stage2_huge_mapping(memslot, hva, vma_pagesize)) { |
1699 | force_pte = true; | |
1700 | vma_pagesize = PAGE_SIZE; | |
1701 | } | |
1702 | ||
b8e0ba7c | 1703 | /* |
280cebfd SP |
1704 | * The stage2 has a minimum of 2 level table (For arm64 see |
1705 | * kvm_arm_setup_stage2()). Hence, we are guaranteed that we can | |
1706 | * use PMD_SIZE huge mappings (even when the PMD is folded into PGD). | |
1707 | * As for PUD huge maps, we must make sure that we have at least | |
1708 | * 3 levels, i.e, PMD is not folded. | |
b8e0ba7c | 1709 | */ |
a80868f3 SP |
1710 | if (vma_pagesize == PMD_SIZE || |
1711 | (vma_pagesize == PUD_SIZE && kvm_stage2_has_pmd(kvm))) | |
b8e0ba7c | 1712 | gfn = (fault_ipa & huge_page_mask(hstate_vma(vma))) >> PAGE_SHIFT; |
ad361f09 CD |
1713 | up_read(¤t->mm->mmap_sem); |
1714 | ||
94f8e641 | 1715 | /* We need minimum second+third level pages */ |
e55cac5b | 1716 | ret = mmu_topup_memory_cache(memcache, kvm_mmu_cache_min_pages(kvm), |
38f791a4 | 1717 | KVM_NR_MEM_OBJS); |
94f8e641 CD |
1718 | if (ret) |
1719 | return ret; | |
1720 | ||
1721 | mmu_seq = vcpu->kvm->mmu_notifier_seq; | |
1722 | /* | |
1723 | * Ensure the read of mmu_notifier_seq happens before we call | |
1724 | * gfn_to_pfn_prot (which calls get_user_pages), so that we don't risk | |
1725 | * the page we just got a reference to gets unmapped before we have a | |
1726 | * chance to grab the mmu_lock, which ensure that if the page gets | |
1727 | * unmapped afterwards, the call to kvm_unmap_hva will take it away | |
1728 | * from us again properly. This smp_rmb() interacts with the smp_wmb() | |
1729 | * in kvm_mmu_notifier_invalidate_<page|range_end>. | |
1730 | */ | |
1731 | smp_rmb(); | |
1732 | ||
ad361f09 | 1733 | pfn = gfn_to_pfn_prot(kvm, gfn, write_fault, &writable); |
196f878a | 1734 | if (pfn == KVM_PFN_ERR_HWPOISON) { |
1559b758 | 1735 | kvm_send_hwpoison_signal(hva, vma_shift); |
196f878a JM |
1736 | return 0; |
1737 | } | |
9ac71595 | 1738 | if (is_error_noslot_pfn(pfn)) |
94f8e641 CD |
1739 | return -EFAULT; |
1740 | ||
15a49a44 | 1741 | if (kvm_is_device_pfn(pfn)) { |
b8865767 | 1742 | mem_type = PAGE_S2_DEVICE; |
15a49a44 MS |
1743 | flags |= KVM_S2PTE_FLAG_IS_IOMAP; |
1744 | } else if (logging_active) { | |
1745 | /* | |
1746 | * Faults on pages in a memslot with logging enabled | |
1747 | * should not be mapped with huge pages (it introduces churn | |
1748 | * and performance degradation), so force a pte mapping. | |
1749 | */ | |
15a49a44 MS |
1750 | flags |= KVM_S2_FLAG_LOGGING_ACTIVE; |
1751 | ||
1752 | /* | |
1753 | * Only actually map the page as writable if this was a write | |
1754 | * fault. | |
1755 | */ | |
1756 | if (!write_fault) | |
1757 | writable = false; | |
1758 | } | |
b8865767 | 1759 | |
6d674e28 MZ |
1760 | if (exec_fault && is_iomap(flags)) |
1761 | return -ENOEXEC; | |
1762 | ||
ad361f09 CD |
1763 | spin_lock(&kvm->mmu_lock); |
1764 | if (mmu_notifier_retry(kvm, mmu_seq)) | |
94f8e641 | 1765 | goto out_unlock; |
15a49a44 | 1766 | |
3f58bf63 PA |
1767 | if (vma_pagesize == PAGE_SIZE && !force_pte) { |
1768 | /* | |
1769 | * Only PMD_SIZE transparent hugepages(THP) are | |
1770 | * currently supported. This code will need to be | |
1771 | * updated to support other THP sizes. | |
2e8010bb SP |
1772 | * |
1773 | * Make sure the host VA and the guest IPA are sufficiently | |
1774 | * aligned and that the block is contained within the memslot. | |
3f58bf63 | 1775 | */ |
2e8010bb SP |
1776 | if (fault_supports_stage2_huge_mapping(memslot, hva, PMD_SIZE) && |
1777 | transparent_hugepage_adjust(&pfn, &fault_ipa)) | |
3f58bf63 PA |
1778 | vma_pagesize = PMD_SIZE; |
1779 | } | |
1780 | ||
1781 | if (writable) | |
1782 | kvm_set_pfn_dirty(pfn); | |
ad361f09 | 1783 | |
6d674e28 | 1784 | if (fault_status != FSC_PERM && !is_iomap(flags)) |
3f58bf63 PA |
1785 | clean_dcache_guest_page(pfn, vma_pagesize); |
1786 | ||
1787 | if (exec_fault) | |
1788 | invalidate_icache_guest_page(pfn, vma_pagesize); | |
1789 | ||
6396b852 PA |
1790 | /* |
1791 | * If we took an execution fault we have made the | |
1792 | * icache/dcache coherent above and should now let the s2 | |
1793 | * mapping be executable. | |
1794 | * | |
1795 | * Write faults (!exec_fault && FSC_PERM) are orthogonal to | |
1796 | * execute permissions, and we preserve whatever we have. | |
1797 | */ | |
1798 | needs_exec = exec_fault || | |
1799 | (fault_status == FSC_PERM && stage2_is_exec(kvm, fault_ipa)); | |
1800 | ||
b8e0ba7c PA |
1801 | if (vma_pagesize == PUD_SIZE) { |
1802 | pud_t new_pud = kvm_pfn_pud(pfn, mem_type); | |
1803 | ||
1804 | new_pud = kvm_pud_mkhuge(new_pud); | |
1805 | if (writable) | |
1806 | new_pud = kvm_s2pud_mkwrite(new_pud); | |
1807 | ||
1808 | if (needs_exec) | |
1809 | new_pud = kvm_s2pud_mkexec(new_pud); | |
1810 | ||
1811 | ret = stage2_set_pud_huge(kvm, memcache, fault_ipa, &new_pud); | |
1812 | } else if (vma_pagesize == PMD_SIZE) { | |
f8df7338 PA |
1813 | pmd_t new_pmd = kvm_pfn_pmd(pfn, mem_type); |
1814 | ||
1815 | new_pmd = kvm_pmd_mkhuge(new_pmd); | |
1816 | ||
3f58bf63 | 1817 | if (writable) |
06485053 | 1818 | new_pmd = kvm_s2pmd_mkwrite(new_pmd); |
d0e22b4a | 1819 | |
6396b852 | 1820 | if (needs_exec) |
d0e22b4a | 1821 | new_pmd = kvm_s2pmd_mkexec(new_pmd); |
a15f6939 | 1822 | |
ad361f09 CD |
1823 | ret = stage2_set_pmd_huge(kvm, memcache, fault_ipa, &new_pmd); |
1824 | } else { | |
f8df7338 | 1825 | pte_t new_pte = kvm_pfn_pte(pfn, mem_type); |
15a49a44 | 1826 | |
ad361f09 | 1827 | if (writable) { |
06485053 | 1828 | new_pte = kvm_s2pte_mkwrite(new_pte); |
15a49a44 | 1829 | mark_page_dirty(kvm, gfn); |
ad361f09 | 1830 | } |
a9c0e12e | 1831 | |
6396b852 | 1832 | if (needs_exec) |
d0e22b4a | 1833 | new_pte = kvm_s2pte_mkexec(new_pte); |
a15f6939 | 1834 | |
15a49a44 | 1835 | ret = stage2_set_pte(kvm, memcache, fault_ipa, &new_pte, flags); |
94f8e641 | 1836 | } |
ad361f09 | 1837 | |
94f8e641 | 1838 | out_unlock: |
ad361f09 | 1839 | spin_unlock(&kvm->mmu_lock); |
35307b9a | 1840 | kvm_set_pfn_accessed(pfn); |
94f8e641 | 1841 | kvm_release_pfn_clean(pfn); |
ad361f09 | 1842 | return ret; |
94f8e641 CD |
1843 | } |
1844 | ||
aeda9130 MZ |
1845 | /* |
1846 | * Resolve the access fault by making the page young again. | |
1847 | * Note that because the faulting entry is guaranteed not to be | |
1848 | * cached in the TLB, we don't need to invalidate anything. | |
06485053 CM |
1849 | * Only the HW Access Flag updates are supported for Stage 2 (no DBM), |
1850 | * so there is no need for atomic (pte|pmd)_mkyoung operations. | |
aeda9130 MZ |
1851 | */ |
1852 | static void handle_access_fault(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa) | |
1853 | { | |
eb3f0624 | 1854 | pud_t *pud; |
aeda9130 MZ |
1855 | pmd_t *pmd; |
1856 | pte_t *pte; | |
ba049e93 | 1857 | kvm_pfn_t pfn; |
aeda9130 MZ |
1858 | bool pfn_valid = false; |
1859 | ||
1860 | trace_kvm_access_fault(fault_ipa); | |
1861 | ||
1862 | spin_lock(&vcpu->kvm->mmu_lock); | |
1863 | ||
eb3f0624 | 1864 | if (!stage2_get_leaf_entry(vcpu->kvm, fault_ipa, &pud, &pmd, &pte)) |
aeda9130 MZ |
1865 | goto out; |
1866 | ||
eb3f0624 PA |
1867 | if (pud) { /* HugeTLB */ |
1868 | *pud = kvm_s2pud_mkyoung(*pud); | |
1869 | pfn = kvm_pud_pfn(*pud); | |
1870 | pfn_valid = true; | |
1871 | } else if (pmd) { /* THP, HugeTLB */ | |
aeda9130 MZ |
1872 | *pmd = pmd_mkyoung(*pmd); |
1873 | pfn = pmd_pfn(*pmd); | |
1874 | pfn_valid = true; | |
eb3f0624 PA |
1875 | } else { |
1876 | *pte = pte_mkyoung(*pte); /* Just a page... */ | |
1877 | pfn = pte_pfn(*pte); | |
1878 | pfn_valid = true; | |
aeda9130 MZ |
1879 | } |
1880 | ||
aeda9130 MZ |
1881 | out: |
1882 | spin_unlock(&vcpu->kvm->mmu_lock); | |
1883 | if (pfn_valid) | |
1884 | kvm_set_pfn_accessed(pfn); | |
1885 | } | |
1886 | ||
94f8e641 CD |
1887 | /** |
1888 | * kvm_handle_guest_abort - handles all 2nd stage aborts | |
1889 | * @vcpu: the VCPU pointer | |
1890 | * @run: the kvm_run structure | |
1891 | * | |
1892 | * Any abort that gets to the host is almost guaranteed to be caused by a | |
1893 | * missing second stage translation table entry, which can mean that either the | |
1894 | * guest simply needs more memory and we must allocate an appropriate page or it | |
1895 | * can mean that the guest tried to access I/O memory, which is emulated by user | |
1896 | * space. The distinction is based on the IPA causing the fault and whether this | |
1897 | * memory region has been registered as standard RAM by user space. | |
1898 | */ | |
342cd0ab CD |
1899 | int kvm_handle_guest_abort(struct kvm_vcpu *vcpu, struct kvm_run *run) |
1900 | { | |
94f8e641 CD |
1901 | unsigned long fault_status; |
1902 | phys_addr_t fault_ipa; | |
1903 | struct kvm_memory_slot *memslot; | |
98047888 CD |
1904 | unsigned long hva; |
1905 | bool is_iabt, write_fault, writable; | |
94f8e641 CD |
1906 | gfn_t gfn; |
1907 | int ret, idx; | |
1908 | ||
621f48e4 TB |
1909 | fault_status = kvm_vcpu_trap_get_fault_type(vcpu); |
1910 | ||
1911 | fault_ipa = kvm_vcpu_get_fault_ipa(vcpu); | |
bb428921 | 1912 | is_iabt = kvm_vcpu_trap_is_iabt(vcpu); |
621f48e4 | 1913 | |
bb428921 JM |
1914 | /* Synchronous External Abort? */ |
1915 | if (kvm_vcpu_dabt_isextabt(vcpu)) { | |
1916 | /* | |
1917 | * For RAS the host kernel may handle this abort. | |
1918 | * There is no need to pass the error into the guest. | |
1919 | */ | |
0db5e022 | 1920 | if (!kvm_handle_guest_sea(fault_ipa, kvm_vcpu_get_hsr(vcpu))) |
621f48e4 | 1921 | return 1; |
621f48e4 | 1922 | |
bb428921 JM |
1923 | if (unlikely(!is_iabt)) { |
1924 | kvm_inject_vabt(vcpu); | |
1925 | return 1; | |
1926 | } | |
4055710b MZ |
1927 | } |
1928 | ||
7393b599 MZ |
1929 | trace_kvm_guest_fault(*vcpu_pc(vcpu), kvm_vcpu_get_hsr(vcpu), |
1930 | kvm_vcpu_get_hfar(vcpu), fault_ipa); | |
94f8e641 CD |
1931 | |
1932 | /* Check the stage-2 fault is trans. fault or write fault */ | |
35307b9a MZ |
1933 | if (fault_status != FSC_FAULT && fault_status != FSC_PERM && |
1934 | fault_status != FSC_ACCESS) { | |
0496daa5 CD |
1935 | kvm_err("Unsupported FSC: EC=%#x xFSC=%#lx ESR_EL2=%#lx\n", |
1936 | kvm_vcpu_trap_get_class(vcpu), | |
1937 | (unsigned long)kvm_vcpu_trap_get_fault(vcpu), | |
1938 | (unsigned long)kvm_vcpu_get_hsr(vcpu)); | |
94f8e641 CD |
1939 | return -EFAULT; |
1940 | } | |
1941 | ||
1942 | idx = srcu_read_lock(&vcpu->kvm->srcu); | |
1943 | ||
1944 | gfn = fault_ipa >> PAGE_SHIFT; | |
98047888 CD |
1945 | memslot = gfn_to_memslot(vcpu->kvm, gfn); |
1946 | hva = gfn_to_hva_memslot_prot(memslot, gfn, &writable); | |
a7d079ce | 1947 | write_fault = kvm_is_write_fault(vcpu); |
98047888 | 1948 | if (kvm_is_error_hva(hva) || (write_fault && !writable)) { |
94f8e641 CD |
1949 | if (is_iabt) { |
1950 | /* Prefetch Abort on I/O address */ | |
6d674e28 MZ |
1951 | ret = -ENOEXEC; |
1952 | goto out; | |
94f8e641 CD |
1953 | } |
1954 | ||
57c841f1 MZ |
1955 | /* |
1956 | * Check for a cache maintenance operation. Since we | |
1957 | * ended-up here, we know it is outside of any memory | |
1958 | * slot. But we can't find out if that is for a device, | |
1959 | * or if the guest is just being stupid. The only thing | |
1960 | * we know for sure is that this range cannot be cached. | |
1961 | * | |
1962 | * So let's assume that the guest is just being | |
1963 | * cautious, and skip the instruction. | |
1964 | */ | |
1965 | if (kvm_vcpu_dabt_is_cm(vcpu)) { | |
1966 | kvm_skip_instr(vcpu, kvm_vcpu_trap_il_is32bit(vcpu)); | |
1967 | ret = 1; | |
1968 | goto out_unlock; | |
1969 | } | |
1970 | ||
cfe3950c MZ |
1971 | /* |
1972 | * The IPA is reported as [MAX:12], so we need to | |
1973 | * complement it with the bottom 12 bits from the | |
1974 | * faulting VA. This is always 12 bits, irrespective | |
1975 | * of the page size. | |
1976 | */ | |
1977 | fault_ipa |= kvm_vcpu_get_hfar(vcpu) & ((1 << 12) - 1); | |
45e96ea6 | 1978 | ret = io_mem_abort(vcpu, run, fault_ipa); |
94f8e641 CD |
1979 | goto out_unlock; |
1980 | } | |
1981 | ||
c3058d5d | 1982 | /* Userspace should not be able to register out-of-bounds IPAs */ |
e55cac5b | 1983 | VM_BUG_ON(fault_ipa >= kvm_phys_size(vcpu->kvm)); |
c3058d5d | 1984 | |
aeda9130 MZ |
1985 | if (fault_status == FSC_ACCESS) { |
1986 | handle_access_fault(vcpu, fault_ipa); | |
1987 | ret = 1; | |
1988 | goto out_unlock; | |
1989 | } | |
1990 | ||
98047888 | 1991 | ret = user_mem_abort(vcpu, fault_ipa, memslot, hva, fault_status); |
94f8e641 CD |
1992 | if (ret == 0) |
1993 | ret = 1; | |
6d674e28 MZ |
1994 | out: |
1995 | if (ret == -ENOEXEC) { | |
1996 | kvm_inject_pabt(vcpu, kvm_vcpu_get_hfar(vcpu)); | |
1997 | ret = 1; | |
1998 | } | |
94f8e641 CD |
1999 | out_unlock: |
2000 | srcu_read_unlock(&vcpu->kvm->srcu, idx); | |
2001 | return ret; | |
342cd0ab CD |
2002 | } |
2003 | ||
1d2ebacc MZ |
2004 | static int handle_hva_to_gpa(struct kvm *kvm, |
2005 | unsigned long start, | |
2006 | unsigned long end, | |
2007 | int (*handler)(struct kvm *kvm, | |
056aad67 SP |
2008 | gpa_t gpa, u64 size, |
2009 | void *data), | |
1d2ebacc | 2010 | void *data) |
d5d8184d CD |
2011 | { |
2012 | struct kvm_memslots *slots; | |
2013 | struct kvm_memory_slot *memslot; | |
1d2ebacc | 2014 | int ret = 0; |
d5d8184d CD |
2015 | |
2016 | slots = kvm_memslots(kvm); | |
2017 | ||
2018 | /* we only care about the pages that the guest sees */ | |
2019 | kvm_for_each_memslot(memslot, slots) { | |
2020 | unsigned long hva_start, hva_end; | |
056aad67 | 2021 | gfn_t gpa; |
d5d8184d CD |
2022 | |
2023 | hva_start = max(start, memslot->userspace_addr); | |
2024 | hva_end = min(end, memslot->userspace_addr + | |
2025 | (memslot->npages << PAGE_SHIFT)); | |
2026 | if (hva_start >= hva_end) | |
2027 | continue; | |
2028 | ||
056aad67 SP |
2029 | gpa = hva_to_gfn_memslot(hva_start, memslot) << PAGE_SHIFT; |
2030 | ret |= handler(kvm, gpa, (u64)(hva_end - hva_start), data); | |
d5d8184d | 2031 | } |
1d2ebacc MZ |
2032 | |
2033 | return ret; | |
d5d8184d CD |
2034 | } |
2035 | ||
056aad67 | 2036 | static int kvm_unmap_hva_handler(struct kvm *kvm, gpa_t gpa, u64 size, void *data) |
d5d8184d | 2037 | { |
056aad67 | 2038 | unmap_stage2_range(kvm, gpa, size); |
1d2ebacc | 2039 | return 0; |
d5d8184d CD |
2040 | } |
2041 | ||
d5d8184d CD |
2042 | int kvm_unmap_hva_range(struct kvm *kvm, |
2043 | unsigned long start, unsigned long end) | |
2044 | { | |
2045 | if (!kvm->arch.pgd) | |
2046 | return 0; | |
2047 | ||
2048 | trace_kvm_unmap_hva_range(start, end); | |
2049 | handle_hva_to_gpa(kvm, start, end, &kvm_unmap_hva_handler, NULL); | |
2050 | return 0; | |
2051 | } | |
2052 | ||
056aad67 | 2053 | static int kvm_set_spte_handler(struct kvm *kvm, gpa_t gpa, u64 size, void *data) |
d5d8184d CD |
2054 | { |
2055 | pte_t *pte = (pte_t *)data; | |
2056 | ||
056aad67 | 2057 | WARN_ON(size != PAGE_SIZE); |
15a49a44 MS |
2058 | /* |
2059 | * We can always call stage2_set_pte with KVM_S2PTE_FLAG_LOGGING_ACTIVE | |
2060 | * flag clear because MMU notifiers will have unmapped a huge PMD before | |
2061 | * calling ->change_pte() (which in turn calls kvm_set_spte_hva()) and | |
2062 | * therefore stage2_set_pte() never needs to clear out a huge PMD | |
2063 | * through this calling path. | |
2064 | */ | |
2065 | stage2_set_pte(kvm, NULL, gpa, pte, 0); | |
1d2ebacc | 2066 | return 0; |
d5d8184d CD |
2067 | } |
2068 | ||
2069 | ||
748c0e31 | 2070 | int kvm_set_spte_hva(struct kvm *kvm, unsigned long hva, pte_t pte) |
d5d8184d CD |
2071 | { |
2072 | unsigned long end = hva + PAGE_SIZE; | |
694556d5 | 2073 | kvm_pfn_t pfn = pte_pfn(pte); |
d5d8184d CD |
2074 | pte_t stage2_pte; |
2075 | ||
2076 | if (!kvm->arch.pgd) | |
748c0e31 | 2077 | return 0; |
d5d8184d CD |
2078 | |
2079 | trace_kvm_set_spte_hva(hva); | |
694556d5 MZ |
2080 | |
2081 | /* | |
2082 | * We've moved a page around, probably through CoW, so let's treat it | |
2083 | * just like a translation fault and clean the cache to the PoC. | |
2084 | */ | |
2085 | clean_dcache_guest_page(pfn, PAGE_SIZE); | |
f8df7338 | 2086 | stage2_pte = kvm_pfn_pte(pfn, PAGE_S2); |
d5d8184d | 2087 | handle_hva_to_gpa(kvm, hva, end, &kvm_set_spte_handler, &stage2_pte); |
748c0e31 LT |
2088 | |
2089 | return 0; | |
d5d8184d CD |
2090 | } |
2091 | ||
056aad67 | 2092 | static int kvm_age_hva_handler(struct kvm *kvm, gpa_t gpa, u64 size, void *data) |
35307b9a | 2093 | { |
35a63966 | 2094 | pud_t *pud; |
35307b9a MZ |
2095 | pmd_t *pmd; |
2096 | pte_t *pte; | |
2097 | ||
35a63966 PA |
2098 | WARN_ON(size != PAGE_SIZE && size != PMD_SIZE && size != PUD_SIZE); |
2099 | if (!stage2_get_leaf_entry(kvm, gpa, &pud, &pmd, &pte)) | |
35307b9a MZ |
2100 | return 0; |
2101 | ||
35a63966 PA |
2102 | if (pud) |
2103 | return stage2_pudp_test_and_clear_young(pud); | |
2104 | else if (pmd) | |
06485053 | 2105 | return stage2_pmdp_test_and_clear_young(pmd); |
35a63966 PA |
2106 | else |
2107 | return stage2_ptep_test_and_clear_young(pte); | |
35307b9a MZ |
2108 | } |
2109 | ||
056aad67 | 2110 | static int kvm_test_age_hva_handler(struct kvm *kvm, gpa_t gpa, u64 size, void *data) |
35307b9a | 2111 | { |
35a63966 | 2112 | pud_t *pud; |
35307b9a MZ |
2113 | pmd_t *pmd; |
2114 | pte_t *pte; | |
2115 | ||
35a63966 PA |
2116 | WARN_ON(size != PAGE_SIZE && size != PMD_SIZE && size != PUD_SIZE); |
2117 | if (!stage2_get_leaf_entry(kvm, gpa, &pud, &pmd, &pte)) | |
35307b9a MZ |
2118 | return 0; |
2119 | ||
35a63966 PA |
2120 | if (pud) |
2121 | return kvm_s2pud_young(*pud); | |
2122 | else if (pmd) | |
35307b9a | 2123 | return pmd_young(*pmd); |
35a63966 | 2124 | else |
35307b9a | 2125 | return pte_young(*pte); |
35307b9a MZ |
2126 | } |
2127 | ||
2128 | int kvm_age_hva(struct kvm *kvm, unsigned long start, unsigned long end) | |
2129 | { | |
7e5a6722 SP |
2130 | if (!kvm->arch.pgd) |
2131 | return 0; | |
35307b9a MZ |
2132 | trace_kvm_age_hva(start, end); |
2133 | return handle_hva_to_gpa(kvm, start, end, kvm_age_hva_handler, NULL); | |
2134 | } | |
2135 | ||
2136 | int kvm_test_age_hva(struct kvm *kvm, unsigned long hva) | |
2137 | { | |
7e5a6722 SP |
2138 | if (!kvm->arch.pgd) |
2139 | return 0; | |
35307b9a | 2140 | trace_kvm_test_age_hva(hva); |
cf2d23e0 GS |
2141 | return handle_hva_to_gpa(kvm, hva, hva + PAGE_SIZE, |
2142 | kvm_test_age_hva_handler, NULL); | |
35307b9a MZ |
2143 | } |
2144 | ||
d5d8184d CD |
2145 | void kvm_mmu_free_memory_caches(struct kvm_vcpu *vcpu) |
2146 | { | |
2147 | mmu_free_memory_cache(&vcpu->arch.mmu_page_cache); | |
2148 | } | |
2149 | ||
342cd0ab CD |
2150 | phys_addr_t kvm_mmu_get_httbr(void) |
2151 | { | |
e4c5a685 AB |
2152 | if (__kvm_cpu_uses_extended_idmap()) |
2153 | return virt_to_phys(merged_hyp_pgd); | |
2154 | else | |
2155 | return virt_to_phys(hyp_pgd); | |
342cd0ab CD |
2156 | } |
2157 | ||
5a677ce0 MZ |
2158 | phys_addr_t kvm_get_idmap_vector(void) |
2159 | { | |
2160 | return hyp_idmap_vector; | |
2161 | } | |
2162 | ||
0535a3e2 MZ |
2163 | static int kvm_map_idmap_text(pgd_t *pgd) |
2164 | { | |
2165 | int err; | |
2166 | ||
2167 | /* Create the idmap in the boot page tables */ | |
98732d1b | 2168 | err = __create_hyp_mappings(pgd, __kvm_idmap_ptrs_per_pgd(), |
0535a3e2 MZ |
2169 | hyp_idmap_start, hyp_idmap_end, |
2170 | __phys_to_pfn(hyp_idmap_start), | |
2171 | PAGE_HYP_EXEC); | |
2172 | if (err) | |
2173 | kvm_err("Failed to idmap %lx-%lx\n", | |
2174 | hyp_idmap_start, hyp_idmap_end); | |
2175 | ||
2176 | return err; | |
2177 | } | |
2178 | ||
342cd0ab CD |
2179 | int kvm_mmu_init(void) |
2180 | { | |
2fb41059 MZ |
2181 | int err; |
2182 | ||
4fda342c | 2183 | hyp_idmap_start = kvm_virt_to_phys(__hyp_idmap_text_start); |
46fef158 | 2184 | hyp_idmap_start = ALIGN_DOWN(hyp_idmap_start, PAGE_SIZE); |
4fda342c | 2185 | hyp_idmap_end = kvm_virt_to_phys(__hyp_idmap_text_end); |
46fef158 | 2186 | hyp_idmap_end = ALIGN(hyp_idmap_end, PAGE_SIZE); |
4fda342c | 2187 | hyp_idmap_vector = kvm_virt_to_phys(__kvm_hyp_init); |
5a677ce0 | 2188 | |
06f75a1f AB |
2189 | /* |
2190 | * We rely on the linker script to ensure at build time that the HYP | |
2191 | * init code does not cross a page boundary. | |
2192 | */ | |
2193 | BUG_ON((hyp_idmap_start ^ (hyp_idmap_end - 1)) & PAGE_MASK); | |
5a677ce0 | 2194 | |
b4ef0499 MZ |
2195 | kvm_debug("IDMAP page: %lx\n", hyp_idmap_start); |
2196 | kvm_debug("HYP VA range: %lx:%lx\n", | |
2197 | kern_hyp_va(PAGE_OFFSET), | |
2198 | kern_hyp_va((unsigned long)high_memory - 1)); | |
eac378a9 | 2199 | |
6c41a413 | 2200 | if (hyp_idmap_start >= kern_hyp_va(PAGE_OFFSET) && |
ed57cac8 | 2201 | hyp_idmap_start < kern_hyp_va((unsigned long)high_memory - 1) && |
d2896d4b | 2202 | hyp_idmap_start != (unsigned long)__hyp_idmap_text_start) { |
eac378a9 MZ |
2203 | /* |
2204 | * The idmap page is intersecting with the VA space, | |
2205 | * it is not safe to continue further. | |
2206 | */ | |
2207 | kvm_err("IDMAP intersecting with HYP VA, unable to continue\n"); | |
2208 | err = -EINVAL; | |
2209 | goto out; | |
2210 | } | |
2211 | ||
38f791a4 | 2212 | hyp_pgd = (pgd_t *)__get_free_pages(GFP_KERNEL | __GFP_ZERO, hyp_pgd_order); |
0535a3e2 | 2213 | if (!hyp_pgd) { |
d5d8184d | 2214 | kvm_err("Hyp mode PGD not allocated\n"); |
2fb41059 MZ |
2215 | err = -ENOMEM; |
2216 | goto out; | |
2217 | } | |
2218 | ||
0535a3e2 MZ |
2219 | if (__kvm_cpu_uses_extended_idmap()) { |
2220 | boot_hyp_pgd = (pgd_t *)__get_free_pages(GFP_KERNEL | __GFP_ZERO, | |
2221 | hyp_pgd_order); | |
2222 | if (!boot_hyp_pgd) { | |
2223 | kvm_err("Hyp boot PGD not allocated\n"); | |
2224 | err = -ENOMEM; | |
2225 | goto out; | |
2226 | } | |
2fb41059 | 2227 | |
0535a3e2 MZ |
2228 | err = kvm_map_idmap_text(boot_hyp_pgd); |
2229 | if (err) | |
2230 | goto out; | |
d5d8184d | 2231 | |
e4c5a685 AB |
2232 | merged_hyp_pgd = (pgd_t *)__get_free_page(GFP_KERNEL | __GFP_ZERO); |
2233 | if (!merged_hyp_pgd) { | |
2234 | kvm_err("Failed to allocate extra HYP pgd\n"); | |
2235 | goto out; | |
2236 | } | |
2237 | __kvm_extend_hypmap(boot_hyp_pgd, hyp_pgd, merged_hyp_pgd, | |
2238 | hyp_idmap_start); | |
0535a3e2 MZ |
2239 | } else { |
2240 | err = kvm_map_idmap_text(hyp_pgd); | |
2241 | if (err) | |
2242 | goto out; | |
5a677ce0 MZ |
2243 | } |
2244 | ||
e3f019b3 | 2245 | io_map_base = hyp_idmap_start; |
d5d8184d | 2246 | return 0; |
2fb41059 | 2247 | out: |
4f728276 | 2248 | free_hyp_pgds(); |
2fb41059 | 2249 | return err; |
342cd0ab | 2250 | } |
df6ce24f EA |
2251 | |
2252 | void kvm_arch_commit_memory_region(struct kvm *kvm, | |
09170a49 | 2253 | const struct kvm_userspace_memory_region *mem, |
9d4c197c | 2254 | struct kvm_memory_slot *old, |
f36f3f28 | 2255 | const struct kvm_memory_slot *new, |
df6ce24f EA |
2256 | enum kvm_mr_change change) |
2257 | { | |
c6473555 MS |
2258 | /* |
2259 | * At this point memslot has been committed and there is an | |
2260 | * allocated dirty_bitmap[], dirty pages will be be tracked while the | |
2261 | * memory slot is write protected. | |
2262 | */ | |
2263 | if (change != KVM_MR_DELETE && mem->flags & KVM_MEM_LOG_DIRTY_PAGES) | |
2264 | kvm_mmu_wp_memory_region(kvm, mem->slot); | |
df6ce24f EA |
2265 | } |
2266 | ||
2267 | int kvm_arch_prepare_memory_region(struct kvm *kvm, | |
2268 | struct kvm_memory_slot *memslot, | |
09170a49 | 2269 | const struct kvm_userspace_memory_region *mem, |
df6ce24f EA |
2270 | enum kvm_mr_change change) |
2271 | { | |
8eef9123 AB |
2272 | hva_t hva = mem->userspace_addr; |
2273 | hva_t reg_end = hva + mem->memory_size; | |
2274 | bool writable = !(mem->flags & KVM_MEM_READONLY); | |
2275 | int ret = 0; | |
2276 | ||
15a49a44 MS |
2277 | if (change != KVM_MR_CREATE && change != KVM_MR_MOVE && |
2278 | change != KVM_MR_FLAGS_ONLY) | |
8eef9123 AB |
2279 | return 0; |
2280 | ||
c3058d5d CD |
2281 | /* |
2282 | * Prevent userspace from creating a memory region outside of the IPA | |
2283 | * space addressable by the KVM guest IPA space. | |
2284 | */ | |
2285 | if (memslot->base_gfn + memslot->npages >= | |
e55cac5b | 2286 | (kvm_phys_size(kvm) >> PAGE_SHIFT)) |
c3058d5d CD |
2287 | return -EFAULT; |
2288 | ||
72f31048 | 2289 | down_read(¤t->mm->mmap_sem); |
8eef9123 AB |
2290 | /* |
2291 | * A memory region could potentially cover multiple VMAs, and any holes | |
2292 | * between them, so iterate over all of them to find out if we can map | |
2293 | * any of them right now. | |
2294 | * | |
2295 | * +--------------------------------------------+ | |
2296 | * +---------------+----------------+ +----------------+ | |
2297 | * | : VMA 1 | VMA 2 | | VMA 3 : | | |
2298 | * +---------------+----------------+ +----------------+ | |
2299 | * | memory region | | |
2300 | * +--------------------------------------------+ | |
2301 | */ | |
2302 | do { | |
2303 | struct vm_area_struct *vma = find_vma(current->mm, hva); | |
2304 | hva_t vm_start, vm_end; | |
2305 | ||
2306 | if (!vma || vma->vm_start >= reg_end) | |
2307 | break; | |
2308 | ||
8eef9123 AB |
2309 | /* |
2310 | * Take the intersection of this VMA with the memory region | |
2311 | */ | |
2312 | vm_start = max(hva, vma->vm_start); | |
2313 | vm_end = min(reg_end, vma->vm_end); | |
2314 | ||
2315 | if (vma->vm_flags & VM_PFNMAP) { | |
2316 | gpa_t gpa = mem->guest_phys_addr + | |
2317 | (vm_start - mem->userspace_addr); | |
ca09f02f MM |
2318 | phys_addr_t pa; |
2319 | ||
2320 | pa = (phys_addr_t)vma->vm_pgoff << PAGE_SHIFT; | |
2321 | pa += vm_start - vma->vm_start; | |
8eef9123 | 2322 | |
15a49a44 | 2323 | /* IO region dirty page logging not allowed */ |
72f31048 MZ |
2324 | if (memslot->flags & KVM_MEM_LOG_DIRTY_PAGES) { |
2325 | ret = -EINVAL; | |
2326 | goto out; | |
2327 | } | |
15a49a44 | 2328 | |
8eef9123 AB |
2329 | ret = kvm_phys_addr_ioremap(kvm, gpa, pa, |
2330 | vm_end - vm_start, | |
2331 | writable); | |
2332 | if (ret) | |
2333 | break; | |
2334 | } | |
2335 | hva = vm_end; | |
2336 | } while (hva < reg_end); | |
2337 | ||
15a49a44 | 2338 | if (change == KVM_MR_FLAGS_ONLY) |
72f31048 | 2339 | goto out; |
15a49a44 | 2340 | |
849260c7 AB |
2341 | spin_lock(&kvm->mmu_lock); |
2342 | if (ret) | |
8eef9123 | 2343 | unmap_stage2_range(kvm, mem->guest_phys_addr, mem->memory_size); |
849260c7 AB |
2344 | else |
2345 | stage2_flush_memslot(kvm, memslot); | |
2346 | spin_unlock(&kvm->mmu_lock); | |
72f31048 MZ |
2347 | out: |
2348 | up_read(¤t->mm->mmap_sem); | |
8eef9123 | 2349 | return ret; |
df6ce24f EA |
2350 | } |
2351 | ||
2352 | void kvm_arch_free_memslot(struct kvm *kvm, struct kvm_memory_slot *free, | |
2353 | struct kvm_memory_slot *dont) | |
2354 | { | |
2355 | } | |
2356 | ||
15248258 | 2357 | void kvm_arch_memslots_updated(struct kvm *kvm, u64 gen) |
df6ce24f EA |
2358 | { |
2359 | } | |
2360 | ||
2361 | void kvm_arch_flush_shadow_all(struct kvm *kvm) | |
2362 | { | |
293f2936 | 2363 | kvm_free_stage2_pgd(kvm); |
df6ce24f EA |
2364 | } |
2365 | ||
2366 | void kvm_arch_flush_shadow_memslot(struct kvm *kvm, | |
2367 | struct kvm_memory_slot *slot) | |
2368 | { | |
8eef9123 AB |
2369 | gpa_t gpa = slot->base_gfn << PAGE_SHIFT; |
2370 | phys_addr_t size = slot->npages << PAGE_SHIFT; | |
2371 | ||
2372 | spin_lock(&kvm->mmu_lock); | |
2373 | unmap_stage2_range(kvm, gpa, size); | |
2374 | spin_unlock(&kvm->mmu_lock); | |
df6ce24f | 2375 | } |
3c1e7165 MZ |
2376 | |
2377 | /* | |
2378 | * See note at ARMv7 ARM B1.14.4 (TL;DR: S/W ops are not easily virtualized). | |
2379 | * | |
2380 | * Main problems: | |
2381 | * - S/W ops are local to a CPU (not broadcast) | |
2382 | * - We have line migration behind our back (speculation) | |
2383 | * - System caches don't support S/W at all (damn!) | |
2384 | * | |
2385 | * In the face of the above, the best we can do is to try and convert | |
2386 | * S/W ops to VA ops. Because the guest is not allowed to infer the | |
2387 | * S/W to PA mapping, it can only use S/W to nuke the whole cache, | |
2388 | * which is a rather good thing for us. | |
2389 | * | |
2390 | * Also, it is only used when turning caches on/off ("The expected | |
2391 | * usage of the cache maintenance instructions that operate by set/way | |
2392 | * is associated with the cache maintenance instructions associated | |
2393 | * with the powerdown and powerup of caches, if this is required by | |
2394 | * the implementation."). | |
2395 | * | |
2396 | * We use the following policy: | |
2397 | * | |
2398 | * - If we trap a S/W operation, we enable VM trapping to detect | |
2399 | * caches being turned on/off, and do a full clean. | |
2400 | * | |
2401 | * - We flush the caches on both caches being turned on and off. | |
2402 | * | |
2403 | * - Once the caches are enabled, we stop trapping VM ops. | |
2404 | */ | |
2405 | void kvm_set_way_flush(struct kvm_vcpu *vcpu) | |
2406 | { | |
3df59d8d | 2407 | unsigned long hcr = *vcpu_hcr(vcpu); |
3c1e7165 MZ |
2408 | |
2409 | /* | |
2410 | * If this is the first time we do a S/W operation | |
2411 | * (i.e. HCR_TVM not set) flush the whole memory, and set the | |
2412 | * VM trapping. | |
2413 | * | |
2414 | * Otherwise, rely on the VM trapping to wait for the MMU + | |
2415 | * Caches to be turned off. At that point, we'll be able to | |
2416 | * clean the caches again. | |
2417 | */ | |
2418 | if (!(hcr & HCR_TVM)) { | |
2419 | trace_kvm_set_way_flush(*vcpu_pc(vcpu), | |
2420 | vcpu_has_cache_enabled(vcpu)); | |
2421 | stage2_flush_vm(vcpu->kvm); | |
3df59d8d | 2422 | *vcpu_hcr(vcpu) = hcr | HCR_TVM; |
3c1e7165 MZ |
2423 | } |
2424 | } | |
2425 | ||
2426 | void kvm_toggle_cache(struct kvm_vcpu *vcpu, bool was_enabled) | |
2427 | { | |
2428 | bool now_enabled = vcpu_has_cache_enabled(vcpu); | |
2429 | ||
2430 | /* | |
2431 | * If switching the MMU+caches on, need to invalidate the caches. | |
2432 | * If switching it off, need to clean the caches. | |
2433 | * Clean + invalidate does the trick always. | |
2434 | */ | |
2435 | if (now_enabled != was_enabled) | |
2436 | stage2_flush_vm(vcpu->kvm); | |
2437 | ||
2438 | /* Caches are now on, stop trapping VM ops (until a S/W op) */ | |
2439 | if (now_enabled) | |
3df59d8d | 2440 | *vcpu_hcr(vcpu) &= ~HCR_TVM; |
3c1e7165 MZ |
2441 | |
2442 | trace_kvm_toggle_cache(*vcpu_pc(vcpu), was_enabled, now_enabled); | |
2443 | } |