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749cf76c CD |
1 | /* |
2 | * Copyright (C) 2012 - Virtual Open Systems and Columbia University | |
3 | * Author: Christoffer Dall <c.dall@virtualopensystems.com> | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License, version 2, as | |
7 | * published by the Free Software Foundation. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License | |
15 | * along with this program; if not, write to the Free Software | |
16 | * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. | |
17 | */ | |
342cd0ab CD |
18 | |
19 | #include <linux/mman.h> | |
20 | #include <linux/kvm_host.h> | |
21 | #include <linux/io.h> | |
45e96ea6 | 22 | #include <trace/events/kvm.h> |
342cd0ab CD |
23 | #include <asm/idmap.h> |
24 | #include <asm/pgalloc.h> | |
94f8e641 | 25 | #include <asm/cacheflush.h> |
342cd0ab CD |
26 | #include <asm/kvm_arm.h> |
27 | #include <asm/kvm_mmu.h> | |
45e96ea6 | 28 | #include <asm/kvm_mmio.h> |
d5d8184d | 29 | #include <asm/kvm_asm.h> |
94f8e641 | 30 | #include <asm/kvm_emulate.h> |
d5d8184d CD |
31 | |
32 | #include "trace.h" | |
342cd0ab CD |
33 | |
34 | extern char __hyp_idmap_text_start[], __hyp_idmap_text_end[]; | |
35 | ||
36 | static DEFINE_MUTEX(kvm_hyp_pgd_mutex); | |
37 | ||
d5d8184d CD |
38 | static void kvm_tlb_flush_vmid(struct kvm *kvm) |
39 | { | |
40 | kvm_call_hyp(__kvm_tlb_flush_vmid, kvm); | |
41 | } | |
42 | ||
d5d8184d CD |
43 | static int mmu_topup_memory_cache(struct kvm_mmu_memory_cache *cache, |
44 | int min, int max) | |
45 | { | |
46 | void *page; | |
47 | ||
48 | BUG_ON(max > KVM_NR_MEM_OBJS); | |
49 | if (cache->nobjs >= min) | |
50 | return 0; | |
51 | while (cache->nobjs < max) { | |
52 | page = (void *)__get_free_page(PGALLOC_GFP); | |
53 | if (!page) | |
54 | return -ENOMEM; | |
55 | cache->objects[cache->nobjs++] = page; | |
56 | } | |
57 | return 0; | |
58 | } | |
59 | ||
60 | static void mmu_free_memory_cache(struct kvm_mmu_memory_cache *mc) | |
61 | { | |
62 | while (mc->nobjs) | |
63 | free_page((unsigned long)mc->objects[--mc->nobjs]); | |
64 | } | |
65 | ||
66 | static void *mmu_memory_cache_alloc(struct kvm_mmu_memory_cache *mc) | |
67 | { | |
68 | void *p; | |
69 | ||
70 | BUG_ON(!mc || !mc->nobjs); | |
71 | p = mc->objects[--mc->nobjs]; | |
72 | return p; | |
73 | } | |
74 | ||
342cd0ab CD |
75 | static void free_ptes(pmd_t *pmd, unsigned long addr) |
76 | { | |
77 | pte_t *pte; | |
78 | unsigned int i; | |
79 | ||
80 | for (i = 0; i < PTRS_PER_PMD; i++, addr += PMD_SIZE) { | |
81 | if (!pmd_none(*pmd) && pmd_table(*pmd)) { | |
82 | pte = pte_offset_kernel(pmd, addr); | |
83 | pte_free_kernel(NULL, pte); | |
84 | } | |
85 | pmd++; | |
86 | } | |
87 | } | |
88 | ||
89 | /** | |
90 | * free_hyp_pmds - free a Hyp-mode level-2 tables and child level-3 tables | |
91 | * | |
92 | * Assumes this is a page table used strictly in Hyp-mode and therefore contains | |
93 | * only mappings in the kernel memory area, which is above PAGE_OFFSET. | |
94 | */ | |
95 | void free_hyp_pmds(void) | |
96 | { | |
97 | pgd_t *pgd; | |
98 | pud_t *pud; | |
99 | pmd_t *pmd; | |
100 | unsigned long addr; | |
101 | ||
102 | mutex_lock(&kvm_hyp_pgd_mutex); | |
103 | for (addr = PAGE_OFFSET; addr != 0; addr += PGDIR_SIZE) { | |
104 | pgd = hyp_pgd + pgd_index(addr); | |
105 | pud = pud_offset(pgd, addr); | |
106 | ||
107 | if (pud_none(*pud)) | |
108 | continue; | |
109 | BUG_ON(pud_bad(*pud)); | |
110 | ||
111 | pmd = pmd_offset(pud, addr); | |
112 | free_ptes(pmd, addr); | |
113 | pmd_free(NULL, pmd); | |
114 | pud_clear(pud); | |
115 | } | |
116 | mutex_unlock(&kvm_hyp_pgd_mutex); | |
117 | } | |
118 | ||
119 | static void create_hyp_pte_mappings(pmd_t *pmd, unsigned long start, | |
120 | unsigned long end) | |
121 | { | |
122 | pte_t *pte; | |
123 | unsigned long addr; | |
124 | struct page *page; | |
125 | ||
126 | for (addr = start & PAGE_MASK; addr < end; addr += PAGE_SIZE) { | |
127 | pte = pte_offset_kernel(pmd, addr); | |
128 | BUG_ON(!virt_addr_valid(addr)); | |
129 | page = virt_to_page(addr); | |
130 | kvm_set_pte(pte, mk_pte(page, PAGE_HYP)); | |
131 | } | |
132 | } | |
133 | ||
134 | static void create_hyp_io_pte_mappings(pmd_t *pmd, unsigned long start, | |
135 | unsigned long end, | |
136 | unsigned long *pfn_base) | |
137 | { | |
138 | pte_t *pte; | |
139 | unsigned long addr; | |
140 | ||
141 | for (addr = start & PAGE_MASK; addr < end; addr += PAGE_SIZE) { | |
142 | pte = pte_offset_kernel(pmd, addr); | |
143 | BUG_ON(pfn_valid(*pfn_base)); | |
144 | kvm_set_pte(pte, pfn_pte(*pfn_base, PAGE_HYP_DEVICE)); | |
145 | (*pfn_base)++; | |
146 | } | |
147 | } | |
148 | ||
149 | static int create_hyp_pmd_mappings(pud_t *pud, unsigned long start, | |
150 | unsigned long end, unsigned long *pfn_base) | |
151 | { | |
152 | pmd_t *pmd; | |
153 | pte_t *pte; | |
154 | unsigned long addr, next; | |
155 | ||
156 | for (addr = start; addr < end; addr = next) { | |
157 | pmd = pmd_offset(pud, addr); | |
158 | ||
159 | BUG_ON(pmd_sect(*pmd)); | |
160 | ||
161 | if (pmd_none(*pmd)) { | |
162 | pte = pte_alloc_one_kernel(NULL, addr); | |
163 | if (!pte) { | |
164 | kvm_err("Cannot allocate Hyp pte\n"); | |
165 | return -ENOMEM; | |
166 | } | |
167 | pmd_populate_kernel(NULL, pmd, pte); | |
168 | } | |
169 | ||
170 | next = pmd_addr_end(addr, end); | |
171 | ||
172 | /* | |
173 | * If pfn_base is NULL, we map kernel pages into HYP with the | |
174 | * virtual address. Otherwise, this is considered an I/O | |
175 | * mapping and we map the physical region starting at | |
176 | * *pfn_base to [start, end[. | |
177 | */ | |
178 | if (!pfn_base) | |
179 | create_hyp_pte_mappings(pmd, addr, next); | |
180 | else | |
181 | create_hyp_io_pte_mappings(pmd, addr, next, pfn_base); | |
182 | } | |
183 | ||
184 | return 0; | |
185 | } | |
186 | ||
187 | static int __create_hyp_mappings(void *from, void *to, unsigned long *pfn_base) | |
188 | { | |
189 | unsigned long start = (unsigned long)from; | |
190 | unsigned long end = (unsigned long)to; | |
191 | pgd_t *pgd; | |
192 | pud_t *pud; | |
193 | pmd_t *pmd; | |
194 | unsigned long addr, next; | |
195 | int err = 0; | |
196 | ||
197 | BUG_ON(start > end); | |
198 | if (start < PAGE_OFFSET) | |
199 | return -EINVAL; | |
200 | ||
201 | mutex_lock(&kvm_hyp_pgd_mutex); | |
202 | for (addr = start; addr < end; addr = next) { | |
203 | pgd = hyp_pgd + pgd_index(addr); | |
204 | pud = pud_offset(pgd, addr); | |
205 | ||
206 | if (pud_none_or_clear_bad(pud)) { | |
207 | pmd = pmd_alloc_one(NULL, addr); | |
208 | if (!pmd) { | |
209 | kvm_err("Cannot allocate Hyp pmd\n"); | |
210 | err = -ENOMEM; | |
211 | goto out; | |
212 | } | |
213 | pud_populate(NULL, pud, pmd); | |
214 | } | |
215 | ||
216 | next = pgd_addr_end(addr, end); | |
217 | err = create_hyp_pmd_mappings(pud, addr, next, pfn_base); | |
218 | if (err) | |
219 | goto out; | |
220 | } | |
221 | out: | |
222 | mutex_unlock(&kvm_hyp_pgd_mutex); | |
223 | return err; | |
224 | } | |
225 | ||
226 | /** | |
227 | * create_hyp_mappings - map a kernel virtual address range in Hyp mode | |
228 | * @from: The virtual kernel start address of the range | |
229 | * @to: The virtual kernel end address of the range (exclusive) | |
230 | * | |
231 | * The same virtual address as the kernel virtual address is also used in | |
232 | * Hyp-mode mapping to the same underlying physical pages. | |
233 | * | |
234 | * Note: Wrapping around zero in the "to" address is not supported. | |
235 | */ | |
236 | int create_hyp_mappings(void *from, void *to) | |
237 | { | |
238 | return __create_hyp_mappings(from, to, NULL); | |
239 | } | |
240 | ||
241 | /** | |
242 | * create_hyp_io_mappings - map a physical IO range in Hyp mode | |
243 | * @from: The virtual HYP start address of the range | |
244 | * @to: The virtual HYP end address of the range (exclusive) | |
245 | * @addr: The physical start address which gets mapped | |
246 | */ | |
247 | int create_hyp_io_mappings(void *from, void *to, phys_addr_t addr) | |
248 | { | |
249 | unsigned long pfn = __phys_to_pfn(addr); | |
250 | return __create_hyp_mappings(from, to, &pfn); | |
251 | } | |
252 | ||
d5d8184d CD |
253 | /** |
254 | * kvm_alloc_stage2_pgd - allocate level-1 table for stage-2 translation. | |
255 | * @kvm: The KVM struct pointer for the VM. | |
256 | * | |
257 | * Allocates the 1st level table only of size defined by S2_PGD_ORDER (can | |
258 | * support either full 40-bit input addresses or limited to 32-bit input | |
259 | * addresses). Clears the allocated pages. | |
260 | * | |
261 | * Note we don't need locking here as this is only called when the VM is | |
262 | * created, which can only be done once. | |
263 | */ | |
264 | int kvm_alloc_stage2_pgd(struct kvm *kvm) | |
265 | { | |
266 | pgd_t *pgd; | |
267 | ||
268 | if (kvm->arch.pgd != NULL) { | |
269 | kvm_err("kvm_arch already initialized?\n"); | |
270 | return -EINVAL; | |
271 | } | |
272 | ||
273 | pgd = (pgd_t *)__get_free_pages(GFP_KERNEL, S2_PGD_ORDER); | |
274 | if (!pgd) | |
275 | return -ENOMEM; | |
276 | ||
277 | /* stage-2 pgd must be aligned to its size */ | |
278 | VM_BUG_ON((unsigned long)pgd & (S2_PGD_SIZE - 1)); | |
279 | ||
280 | memset(pgd, 0, PTRS_PER_S2_PGD * sizeof(pgd_t)); | |
c62ee2b2 | 281 | kvm_clean_pgd(pgd); |
d5d8184d CD |
282 | kvm->arch.pgd = pgd; |
283 | ||
284 | return 0; | |
285 | } | |
286 | ||
287 | static void clear_pud_entry(pud_t *pud) | |
288 | { | |
289 | pmd_t *pmd_table = pmd_offset(pud, 0); | |
290 | pud_clear(pud); | |
291 | pmd_free(NULL, pmd_table); | |
292 | put_page(virt_to_page(pud)); | |
293 | } | |
294 | ||
295 | static void clear_pmd_entry(pmd_t *pmd) | |
296 | { | |
297 | pte_t *pte_table = pte_offset_kernel(pmd, 0); | |
298 | pmd_clear(pmd); | |
299 | pte_free_kernel(NULL, pte_table); | |
300 | put_page(virt_to_page(pmd)); | |
301 | } | |
302 | ||
303 | static bool pmd_empty(pmd_t *pmd) | |
304 | { | |
305 | struct page *pmd_page = virt_to_page(pmd); | |
306 | return page_count(pmd_page) == 1; | |
307 | } | |
308 | ||
309 | static void clear_pte_entry(pte_t *pte) | |
310 | { | |
311 | if (pte_present(*pte)) { | |
312 | kvm_set_pte(pte, __pte(0)); | |
313 | put_page(virt_to_page(pte)); | |
314 | } | |
315 | } | |
316 | ||
317 | static bool pte_empty(pte_t *pte) | |
318 | { | |
319 | struct page *pte_page = virt_to_page(pte); | |
320 | return page_count(pte_page) == 1; | |
321 | } | |
322 | ||
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) | |
335 | { | |
336 | pgd_t *pgd; | |
337 | pud_t *pud; | |
338 | pmd_t *pmd; | |
339 | pte_t *pte; | |
340 | phys_addr_t addr = start, end = start + size; | |
341 | u64 range; | |
342 | ||
343 | while (addr < end) { | |
344 | pgd = kvm->arch.pgd + pgd_index(addr); | |
345 | pud = pud_offset(pgd, addr); | |
346 | if (pud_none(*pud)) { | |
347 | addr += PUD_SIZE; | |
348 | continue; | |
349 | } | |
350 | ||
351 | pmd = pmd_offset(pud, addr); | |
352 | if (pmd_none(*pmd)) { | |
353 | addr += PMD_SIZE; | |
354 | continue; | |
355 | } | |
356 | ||
357 | pte = pte_offset_kernel(pmd, addr); | |
358 | clear_pte_entry(pte); | |
359 | range = PAGE_SIZE; | |
360 | ||
361 | /* If we emptied the pte, walk back up the ladder */ | |
362 | if (pte_empty(pte)) { | |
363 | clear_pmd_entry(pmd); | |
364 | range = PMD_SIZE; | |
365 | if (pmd_empty(pmd)) { | |
366 | clear_pud_entry(pud); | |
367 | range = PUD_SIZE; | |
368 | } | |
369 | } | |
370 | ||
371 | addr += range; | |
372 | } | |
373 | } | |
374 | ||
375 | /** | |
376 | * kvm_free_stage2_pgd - free all stage-2 tables | |
377 | * @kvm: The KVM struct pointer for the VM. | |
378 | * | |
379 | * Walks the level-1 page table pointed to by kvm->arch.pgd and frees all | |
380 | * underlying level-2 and level-3 tables before freeing the actual level-1 table | |
381 | * and setting the struct pointer to NULL. | |
382 | * | |
383 | * Note we don't need locking here as this is only called when the VM is | |
384 | * destroyed, which can only be done once. | |
385 | */ | |
386 | void kvm_free_stage2_pgd(struct kvm *kvm) | |
387 | { | |
388 | if (kvm->arch.pgd == NULL) | |
389 | return; | |
390 | ||
391 | unmap_stage2_range(kvm, 0, KVM_PHYS_SIZE); | |
392 | free_pages((unsigned long)kvm->arch.pgd, S2_PGD_ORDER); | |
393 | kvm->arch.pgd = NULL; | |
394 | } | |
395 | ||
396 | ||
397 | static int stage2_set_pte(struct kvm *kvm, struct kvm_mmu_memory_cache *cache, | |
398 | phys_addr_t addr, const pte_t *new_pte, bool iomap) | |
399 | { | |
400 | pgd_t *pgd; | |
401 | pud_t *pud; | |
402 | pmd_t *pmd; | |
403 | pte_t *pte, old_pte; | |
404 | ||
405 | /* Create 2nd stage page table mapping - Level 1 */ | |
406 | pgd = kvm->arch.pgd + pgd_index(addr); | |
407 | pud = pud_offset(pgd, addr); | |
408 | if (pud_none(*pud)) { | |
409 | if (!cache) | |
410 | return 0; /* ignore calls from kvm_set_spte_hva */ | |
411 | pmd = mmu_memory_cache_alloc(cache); | |
412 | pud_populate(NULL, pud, pmd); | |
d5d8184d | 413 | get_page(virt_to_page(pud)); |
c62ee2b2 MZ |
414 | } |
415 | ||
416 | pmd = pmd_offset(pud, addr); | |
d5d8184d CD |
417 | |
418 | /* Create 2nd stage page table mapping - Level 2 */ | |
419 | if (pmd_none(*pmd)) { | |
420 | if (!cache) | |
421 | return 0; /* ignore calls from kvm_set_spte_hva */ | |
422 | pte = mmu_memory_cache_alloc(cache); | |
c62ee2b2 | 423 | kvm_clean_pte(pte); |
d5d8184d | 424 | pmd_populate_kernel(NULL, pmd, pte); |
d5d8184d | 425 | get_page(virt_to_page(pmd)); |
c62ee2b2 MZ |
426 | } |
427 | ||
428 | pte = pte_offset_kernel(pmd, addr); | |
d5d8184d CD |
429 | |
430 | if (iomap && pte_present(*pte)) | |
431 | return -EFAULT; | |
432 | ||
433 | /* Create 2nd stage page table mapping - Level 3 */ | |
434 | old_pte = *pte; | |
435 | kvm_set_pte(pte, *new_pte); | |
436 | if (pte_present(old_pte)) | |
437 | kvm_tlb_flush_vmid(kvm); | |
438 | else | |
439 | get_page(virt_to_page(pte)); | |
440 | ||
441 | return 0; | |
442 | } | |
443 | ||
444 | /** | |
445 | * kvm_phys_addr_ioremap - map a device range to guest IPA | |
446 | * | |
447 | * @kvm: The KVM pointer | |
448 | * @guest_ipa: The IPA at which to insert the mapping | |
449 | * @pa: The physical address of the device | |
450 | * @size: The size of the mapping | |
451 | */ | |
452 | int kvm_phys_addr_ioremap(struct kvm *kvm, phys_addr_t guest_ipa, | |
453 | phys_addr_t pa, unsigned long size) | |
454 | { | |
455 | phys_addr_t addr, end; | |
456 | int ret = 0; | |
457 | unsigned long pfn; | |
458 | struct kvm_mmu_memory_cache cache = { 0, }; | |
459 | ||
460 | end = (guest_ipa + size + PAGE_SIZE - 1) & PAGE_MASK; | |
461 | pfn = __phys_to_pfn(pa); | |
462 | ||
463 | for (addr = guest_ipa; addr < end; addr += PAGE_SIZE) { | |
c62ee2b2 MZ |
464 | pte_t pte = pfn_pte(pfn, PAGE_S2_DEVICE); |
465 | kvm_set_s2pte_writable(&pte); | |
d5d8184d CD |
466 | |
467 | ret = mmu_topup_memory_cache(&cache, 2, 2); | |
468 | if (ret) | |
469 | goto out; | |
470 | spin_lock(&kvm->mmu_lock); | |
471 | ret = stage2_set_pte(kvm, &cache, addr, &pte, true); | |
472 | spin_unlock(&kvm->mmu_lock); | |
473 | if (ret) | |
474 | goto out; | |
475 | ||
476 | pfn++; | |
477 | } | |
478 | ||
479 | out: | |
480 | mmu_free_memory_cache(&cache); | |
481 | return ret; | |
482 | } | |
483 | ||
94f8e641 CD |
484 | static int user_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa, |
485 | gfn_t gfn, struct kvm_memory_slot *memslot, | |
486 | unsigned long fault_status) | |
487 | { | |
488 | pte_t new_pte; | |
489 | pfn_t pfn; | |
490 | int ret; | |
491 | bool write_fault, writable; | |
492 | unsigned long mmu_seq; | |
493 | struct kvm_mmu_memory_cache *memcache = &vcpu->arch.mmu_page_cache; | |
494 | ||
7393b599 | 495 | write_fault = kvm_is_write_fault(kvm_vcpu_get_hsr(vcpu)); |
94f8e641 CD |
496 | if (fault_status == FSC_PERM && !write_fault) { |
497 | kvm_err("Unexpected L2 read permission error\n"); | |
498 | return -EFAULT; | |
499 | } | |
500 | ||
501 | /* We need minimum second+third level pages */ | |
502 | ret = mmu_topup_memory_cache(memcache, 2, KVM_NR_MEM_OBJS); | |
503 | if (ret) | |
504 | return ret; | |
505 | ||
506 | mmu_seq = vcpu->kvm->mmu_notifier_seq; | |
507 | /* | |
508 | * Ensure the read of mmu_notifier_seq happens before we call | |
509 | * gfn_to_pfn_prot (which calls get_user_pages), so that we don't risk | |
510 | * the page we just got a reference to gets unmapped before we have a | |
511 | * chance to grab the mmu_lock, which ensure that if the page gets | |
512 | * unmapped afterwards, the call to kvm_unmap_hva will take it away | |
513 | * from us again properly. This smp_rmb() interacts with the smp_wmb() | |
514 | * in kvm_mmu_notifier_invalidate_<page|range_end>. | |
515 | */ | |
516 | smp_rmb(); | |
517 | ||
518 | pfn = gfn_to_pfn_prot(vcpu->kvm, gfn, write_fault, &writable); | |
519 | if (is_error_pfn(pfn)) | |
520 | return -EFAULT; | |
521 | ||
522 | new_pte = pfn_pte(pfn, PAGE_S2); | |
523 | coherent_icache_guest_page(vcpu->kvm, gfn); | |
524 | ||
525 | spin_lock(&vcpu->kvm->mmu_lock); | |
526 | if (mmu_notifier_retry(vcpu->kvm, mmu_seq)) | |
527 | goto out_unlock; | |
528 | if (writable) { | |
c62ee2b2 | 529 | kvm_set_s2pte_writable(&new_pte); |
94f8e641 CD |
530 | kvm_set_pfn_dirty(pfn); |
531 | } | |
532 | stage2_set_pte(vcpu->kvm, memcache, fault_ipa, &new_pte, false); | |
533 | ||
534 | out_unlock: | |
535 | spin_unlock(&vcpu->kvm->mmu_lock); | |
536 | kvm_release_pfn_clean(pfn); | |
537 | return 0; | |
538 | } | |
539 | ||
540 | /** | |
541 | * kvm_handle_guest_abort - handles all 2nd stage aborts | |
542 | * @vcpu: the VCPU pointer | |
543 | * @run: the kvm_run structure | |
544 | * | |
545 | * Any abort that gets to the host is almost guaranteed to be caused by a | |
546 | * missing second stage translation table entry, which can mean that either the | |
547 | * guest simply needs more memory and we must allocate an appropriate page or it | |
548 | * can mean that the guest tried to access I/O memory, which is emulated by user | |
549 | * space. The distinction is based on the IPA causing the fault and whether this | |
550 | * memory region has been registered as standard RAM by user space. | |
551 | */ | |
342cd0ab CD |
552 | int kvm_handle_guest_abort(struct kvm_vcpu *vcpu, struct kvm_run *run) |
553 | { | |
94f8e641 CD |
554 | unsigned long fault_status; |
555 | phys_addr_t fault_ipa; | |
556 | struct kvm_memory_slot *memslot; | |
557 | bool is_iabt; | |
558 | gfn_t gfn; | |
559 | int ret, idx; | |
560 | ||
52d1dba9 | 561 | is_iabt = kvm_vcpu_trap_is_iabt(vcpu); |
7393b599 | 562 | fault_ipa = kvm_vcpu_get_fault_ipa(vcpu); |
94f8e641 | 563 | |
7393b599 MZ |
564 | trace_kvm_guest_fault(*vcpu_pc(vcpu), kvm_vcpu_get_hsr(vcpu), |
565 | kvm_vcpu_get_hfar(vcpu), fault_ipa); | |
94f8e641 CD |
566 | |
567 | /* Check the stage-2 fault is trans. fault or write fault */ | |
1cc287dd | 568 | fault_status = kvm_vcpu_trap_get_fault(vcpu); |
94f8e641 | 569 | if (fault_status != FSC_FAULT && fault_status != FSC_PERM) { |
52d1dba9 MZ |
570 | kvm_err("Unsupported fault status: EC=%#x DFCS=%#lx\n", |
571 | kvm_vcpu_trap_get_class(vcpu), fault_status); | |
94f8e641 CD |
572 | return -EFAULT; |
573 | } | |
574 | ||
575 | idx = srcu_read_lock(&vcpu->kvm->srcu); | |
576 | ||
577 | gfn = fault_ipa >> PAGE_SHIFT; | |
578 | if (!kvm_is_visible_gfn(vcpu->kvm, gfn)) { | |
579 | if (is_iabt) { | |
580 | /* Prefetch Abort on I/O address */ | |
7393b599 | 581 | kvm_inject_pabt(vcpu, kvm_vcpu_get_hfar(vcpu)); |
94f8e641 CD |
582 | ret = 1; |
583 | goto out_unlock; | |
584 | } | |
585 | ||
586 | if (fault_status != FSC_FAULT) { | |
587 | kvm_err("Unsupported fault status on io memory: %#lx\n", | |
588 | fault_status); | |
589 | ret = -EFAULT; | |
590 | goto out_unlock; | |
591 | } | |
592 | ||
45e96ea6 | 593 | /* Adjust page offset */ |
7393b599 | 594 | fault_ipa |= kvm_vcpu_get_hfar(vcpu) & ~PAGE_MASK; |
45e96ea6 | 595 | ret = io_mem_abort(vcpu, run, fault_ipa); |
94f8e641 CD |
596 | goto out_unlock; |
597 | } | |
598 | ||
599 | memslot = gfn_to_memslot(vcpu->kvm, gfn); | |
94f8e641 CD |
600 | |
601 | ret = user_mem_abort(vcpu, fault_ipa, gfn, memslot, fault_status); | |
602 | if (ret == 0) | |
603 | ret = 1; | |
604 | out_unlock: | |
605 | srcu_read_unlock(&vcpu->kvm->srcu, idx); | |
606 | return ret; | |
342cd0ab CD |
607 | } |
608 | ||
d5d8184d CD |
609 | static void handle_hva_to_gpa(struct kvm *kvm, |
610 | unsigned long start, | |
611 | unsigned long end, | |
612 | void (*handler)(struct kvm *kvm, | |
613 | gpa_t gpa, void *data), | |
614 | void *data) | |
615 | { | |
616 | struct kvm_memslots *slots; | |
617 | struct kvm_memory_slot *memslot; | |
618 | ||
619 | slots = kvm_memslots(kvm); | |
620 | ||
621 | /* we only care about the pages that the guest sees */ | |
622 | kvm_for_each_memslot(memslot, slots) { | |
623 | unsigned long hva_start, hva_end; | |
624 | gfn_t gfn, gfn_end; | |
625 | ||
626 | hva_start = max(start, memslot->userspace_addr); | |
627 | hva_end = min(end, memslot->userspace_addr + | |
628 | (memslot->npages << PAGE_SHIFT)); | |
629 | if (hva_start >= hva_end) | |
630 | continue; | |
631 | ||
632 | /* | |
633 | * {gfn(page) | page intersects with [hva_start, hva_end)} = | |
634 | * {gfn_start, gfn_start+1, ..., gfn_end-1}. | |
635 | */ | |
636 | gfn = hva_to_gfn_memslot(hva_start, memslot); | |
637 | gfn_end = hva_to_gfn_memslot(hva_end + PAGE_SIZE - 1, memslot); | |
638 | ||
639 | for (; gfn < gfn_end; ++gfn) { | |
640 | gpa_t gpa = gfn << PAGE_SHIFT; | |
641 | handler(kvm, gpa, data); | |
642 | } | |
643 | } | |
644 | } | |
645 | ||
646 | static void kvm_unmap_hva_handler(struct kvm *kvm, gpa_t gpa, void *data) | |
647 | { | |
648 | unmap_stage2_range(kvm, gpa, PAGE_SIZE); | |
649 | kvm_tlb_flush_vmid(kvm); | |
650 | } | |
651 | ||
652 | int kvm_unmap_hva(struct kvm *kvm, unsigned long hva) | |
653 | { | |
654 | unsigned long end = hva + PAGE_SIZE; | |
655 | ||
656 | if (!kvm->arch.pgd) | |
657 | return 0; | |
658 | ||
659 | trace_kvm_unmap_hva(hva); | |
660 | handle_hva_to_gpa(kvm, hva, end, &kvm_unmap_hva_handler, NULL); | |
661 | return 0; | |
662 | } | |
663 | ||
664 | int kvm_unmap_hva_range(struct kvm *kvm, | |
665 | unsigned long start, unsigned long end) | |
666 | { | |
667 | if (!kvm->arch.pgd) | |
668 | return 0; | |
669 | ||
670 | trace_kvm_unmap_hva_range(start, end); | |
671 | handle_hva_to_gpa(kvm, start, end, &kvm_unmap_hva_handler, NULL); | |
672 | return 0; | |
673 | } | |
674 | ||
675 | static void kvm_set_spte_handler(struct kvm *kvm, gpa_t gpa, void *data) | |
676 | { | |
677 | pte_t *pte = (pte_t *)data; | |
678 | ||
679 | stage2_set_pte(kvm, NULL, gpa, pte, false); | |
680 | } | |
681 | ||
682 | ||
683 | void kvm_set_spte_hva(struct kvm *kvm, unsigned long hva, pte_t pte) | |
684 | { | |
685 | unsigned long end = hva + PAGE_SIZE; | |
686 | pte_t stage2_pte; | |
687 | ||
688 | if (!kvm->arch.pgd) | |
689 | return; | |
690 | ||
691 | trace_kvm_set_spte_hva(hva); | |
692 | stage2_pte = pfn_pte(pte_pfn(pte), PAGE_S2); | |
693 | handle_hva_to_gpa(kvm, hva, end, &kvm_set_spte_handler, &stage2_pte); | |
694 | } | |
695 | ||
696 | void kvm_mmu_free_memory_caches(struct kvm_vcpu *vcpu) | |
697 | { | |
698 | mmu_free_memory_cache(&vcpu->arch.mmu_page_cache); | |
699 | } | |
700 | ||
342cd0ab CD |
701 | phys_addr_t kvm_mmu_get_httbr(void) |
702 | { | |
703 | VM_BUG_ON(!virt_addr_valid(hyp_pgd)); | |
704 | return virt_to_phys(hyp_pgd); | |
705 | } | |
706 | ||
707 | int kvm_mmu_init(void) | |
708 | { | |
d5d8184d CD |
709 | if (!hyp_pgd) { |
710 | kvm_err("Hyp mode PGD not allocated\n"); | |
711 | return -ENOMEM; | |
712 | } | |
713 | ||
714 | return 0; | |
342cd0ab CD |
715 | } |
716 | ||
717 | /** | |
718 | * kvm_clear_idmap - remove all idmaps from the hyp pgd | |
719 | * | |
720 | * Free the underlying pmds for all pgds in range and clear the pgds (but | |
721 | * don't free them) afterwards. | |
722 | */ | |
723 | void kvm_clear_hyp_idmap(void) | |
724 | { | |
725 | unsigned long addr, end; | |
726 | unsigned long next; | |
727 | pgd_t *pgd = hyp_pgd; | |
728 | pud_t *pud; | |
729 | pmd_t *pmd; | |
730 | ||
731 | addr = virt_to_phys(__hyp_idmap_text_start); | |
732 | end = virt_to_phys(__hyp_idmap_text_end); | |
733 | ||
734 | pgd += pgd_index(addr); | |
735 | do { | |
736 | next = pgd_addr_end(addr, end); | |
737 | if (pgd_none_or_clear_bad(pgd)) | |
738 | continue; | |
739 | pud = pud_offset(pgd, addr); | |
740 | pmd = pmd_offset(pud, addr); | |
741 | ||
742 | pud_clear(pud); | |
c62ee2b2 | 743 | kvm_clean_pmd_entry(pmd); |
342cd0ab CD |
744 | pmd_free(NULL, (pmd_t *)((unsigned long)pmd & PAGE_MASK)); |
745 | } while (pgd++, addr = next, addr < end); | |
746 | } |