Commit | Line | Data |
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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> | |
ad361f09 | 22 | #include <linux/hugetlb.h> |
45e96ea6 | 23 | #include <trace/events/kvm.h> |
342cd0ab | 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 | ||
5a677ce0 | 36 | static pgd_t *boot_hyp_pgd; |
2fb41059 | 37 | static pgd_t *hyp_pgd; |
342cd0ab CD |
38 | static DEFINE_MUTEX(kvm_hyp_pgd_mutex); |
39 | ||
5a677ce0 MZ |
40 | static void *init_bounce_page; |
41 | static unsigned long hyp_idmap_start; | |
42 | static unsigned long hyp_idmap_end; | |
43 | static phys_addr_t hyp_idmap_vector; | |
44 | ||
38f791a4 | 45 | #define hyp_pgd_order get_order(PTRS_PER_PGD * sizeof(pgd_t)) |
5d4e08c4 | 46 | |
9b5fdb97 | 47 | #define kvm_pmd_huge(_x) (pmd_huge(_x) || pmd_trans_huge(_x)) |
ad361f09 | 48 | |
48762767 | 49 | static void kvm_tlb_flush_vmid_ipa(struct kvm *kvm, phys_addr_t ipa) |
d5d8184d | 50 | { |
d4cb9df5 MZ |
51 | /* |
52 | * This function also gets called when dealing with HYP page | |
53 | * tables. As HYP doesn't have an associated struct kvm (and | |
54 | * the HYP page tables are fairly static), we don't do | |
55 | * anything there. | |
56 | */ | |
57 | if (kvm) | |
58 | kvm_call_hyp(__kvm_tlb_flush_vmid_ipa, kvm, ipa); | |
d5d8184d CD |
59 | } |
60 | ||
d5d8184d CD |
61 | static int mmu_topup_memory_cache(struct kvm_mmu_memory_cache *cache, |
62 | int min, int max) | |
63 | { | |
64 | void *page; | |
65 | ||
66 | BUG_ON(max > KVM_NR_MEM_OBJS); | |
67 | if (cache->nobjs >= min) | |
68 | return 0; | |
69 | while (cache->nobjs < max) { | |
70 | page = (void *)__get_free_page(PGALLOC_GFP); | |
71 | if (!page) | |
72 | return -ENOMEM; | |
73 | cache->objects[cache->nobjs++] = page; | |
74 | } | |
75 | return 0; | |
76 | } | |
77 | ||
78 | static void mmu_free_memory_cache(struct kvm_mmu_memory_cache *mc) | |
79 | { | |
80 | while (mc->nobjs) | |
81 | free_page((unsigned long)mc->objects[--mc->nobjs]); | |
82 | } | |
83 | ||
84 | static void *mmu_memory_cache_alloc(struct kvm_mmu_memory_cache *mc) | |
85 | { | |
86 | void *p; | |
87 | ||
88 | BUG_ON(!mc || !mc->nobjs); | |
89 | p = mc->objects[--mc->nobjs]; | |
90 | return p; | |
91 | } | |
92 | ||
4f853a71 | 93 | static void clear_pgd_entry(struct kvm *kvm, pgd_t *pgd, phys_addr_t addr) |
979acd5e | 94 | { |
4f853a71 CD |
95 | pud_t *pud_table __maybe_unused = pud_offset(pgd, 0); |
96 | pgd_clear(pgd); | |
97 | kvm_tlb_flush_vmid_ipa(kvm, addr); | |
98 | pud_free(NULL, pud_table); | |
99 | put_page(virt_to_page(pgd)); | |
979acd5e MZ |
100 | } |
101 | ||
d4cb9df5 | 102 | static void clear_pud_entry(struct kvm *kvm, pud_t *pud, phys_addr_t addr) |
342cd0ab | 103 | { |
4f853a71 CD |
104 | pmd_t *pmd_table = pmd_offset(pud, 0); |
105 | VM_BUG_ON(pud_huge(*pud)); | |
106 | pud_clear(pud); | |
107 | kvm_tlb_flush_vmid_ipa(kvm, addr); | |
108 | pmd_free(NULL, pmd_table); | |
4f728276 MZ |
109 | put_page(virt_to_page(pud)); |
110 | } | |
342cd0ab | 111 | |
d4cb9df5 | 112 | static void clear_pmd_entry(struct kvm *kvm, pmd_t *pmd, phys_addr_t addr) |
4f728276 | 113 | { |
4f853a71 CD |
114 | pte_t *pte_table = pte_offset_kernel(pmd, 0); |
115 | VM_BUG_ON(kvm_pmd_huge(*pmd)); | |
116 | pmd_clear(pmd); | |
117 | kvm_tlb_flush_vmid_ipa(kvm, addr); | |
118 | pte_free_kernel(NULL, pte_table); | |
4f728276 MZ |
119 | put_page(virt_to_page(pmd)); |
120 | } | |
121 | ||
4f853a71 CD |
122 | static void unmap_ptes(struct kvm *kvm, pmd_t *pmd, |
123 | phys_addr_t addr, phys_addr_t end) | |
4f728276 | 124 | { |
4f853a71 CD |
125 | phys_addr_t start_addr = addr; |
126 | pte_t *pte, *start_pte; | |
127 | ||
128 | start_pte = pte = pte_offset_kernel(pmd, addr); | |
129 | do { | |
130 | if (!pte_none(*pte)) { | |
131 | kvm_set_pte(pte, __pte(0)); | |
132 | put_page(virt_to_page(pte)); | |
133 | kvm_tlb_flush_vmid_ipa(kvm, addr); | |
134 | } | |
135 | } while (pte++, addr += PAGE_SIZE, addr != end); | |
136 | ||
38f791a4 | 137 | if (kvm_pte_table_empty(kvm, start_pte)) |
4f853a71 | 138 | clear_pmd_entry(kvm, pmd, start_addr); |
342cd0ab CD |
139 | } |
140 | ||
4f853a71 CD |
141 | static void unmap_pmds(struct kvm *kvm, pud_t *pud, |
142 | phys_addr_t addr, phys_addr_t end) | |
000d3996 | 143 | { |
4f853a71 CD |
144 | phys_addr_t next, start_addr = addr; |
145 | pmd_t *pmd, *start_pmd; | |
000d3996 | 146 | |
4f853a71 CD |
147 | start_pmd = pmd = pmd_offset(pud, addr); |
148 | do { | |
149 | next = kvm_pmd_addr_end(addr, end); | |
150 | if (!pmd_none(*pmd)) { | |
151 | if (kvm_pmd_huge(*pmd)) { | |
152 | pmd_clear(pmd); | |
153 | kvm_tlb_flush_vmid_ipa(kvm, addr); | |
154 | put_page(virt_to_page(pmd)); | |
155 | } else { | |
156 | unmap_ptes(kvm, pmd, addr, next); | |
157 | } | |
ad361f09 | 158 | } |
4f853a71 | 159 | } while (pmd++, addr = next, addr != end); |
ad361f09 | 160 | |
38f791a4 | 161 | if (kvm_pmd_table_empty(kvm, start_pmd)) |
4f853a71 CD |
162 | clear_pud_entry(kvm, pud, start_addr); |
163 | } | |
000d3996 | 164 | |
4f853a71 CD |
165 | static void unmap_puds(struct kvm *kvm, pgd_t *pgd, |
166 | phys_addr_t addr, phys_addr_t end) | |
167 | { | |
168 | phys_addr_t next, start_addr = addr; | |
169 | pud_t *pud, *start_pud; | |
4f728276 | 170 | |
4f853a71 CD |
171 | start_pud = pud = pud_offset(pgd, addr); |
172 | do { | |
173 | next = kvm_pud_addr_end(addr, end); | |
174 | if (!pud_none(*pud)) { | |
175 | if (pud_huge(*pud)) { | |
176 | pud_clear(pud); | |
177 | kvm_tlb_flush_vmid_ipa(kvm, addr); | |
178 | put_page(virt_to_page(pud)); | |
179 | } else { | |
180 | unmap_pmds(kvm, pud, addr, next); | |
4f728276 MZ |
181 | } |
182 | } | |
4f853a71 | 183 | } while (pud++, addr = next, addr != end); |
4f728276 | 184 | |
38f791a4 | 185 | if (kvm_pud_table_empty(kvm, start_pud)) |
4f853a71 CD |
186 | clear_pgd_entry(kvm, pgd, start_addr); |
187 | } | |
188 | ||
189 | ||
190 | static void unmap_range(struct kvm *kvm, pgd_t *pgdp, | |
191 | phys_addr_t start, u64 size) | |
192 | { | |
193 | pgd_t *pgd; | |
194 | phys_addr_t addr = start, end = start + size; | |
195 | phys_addr_t next; | |
196 | ||
197 | pgd = pgdp + pgd_index(addr); | |
198 | do { | |
199 | next = kvm_pgd_addr_end(addr, end); | |
200 | unmap_puds(kvm, pgd, addr, next); | |
201 | } while (pgd++, addr = next, addr != end); | |
000d3996 MZ |
202 | } |
203 | ||
9d218a1f MZ |
204 | static void stage2_flush_ptes(struct kvm *kvm, pmd_t *pmd, |
205 | phys_addr_t addr, phys_addr_t end) | |
206 | { | |
207 | pte_t *pte; | |
208 | ||
209 | pte = pte_offset_kernel(pmd, addr); | |
210 | do { | |
211 | if (!pte_none(*pte)) { | |
212 | hva_t hva = gfn_to_hva(kvm, addr >> PAGE_SHIFT); | |
213 | kvm_flush_dcache_to_poc((void*)hva, PAGE_SIZE); | |
214 | } | |
215 | } while (pte++, addr += PAGE_SIZE, addr != end); | |
216 | } | |
217 | ||
218 | static void stage2_flush_pmds(struct kvm *kvm, pud_t *pud, | |
219 | phys_addr_t addr, phys_addr_t end) | |
220 | { | |
221 | pmd_t *pmd; | |
222 | phys_addr_t next; | |
223 | ||
224 | pmd = pmd_offset(pud, addr); | |
225 | do { | |
226 | next = kvm_pmd_addr_end(addr, end); | |
227 | if (!pmd_none(*pmd)) { | |
228 | if (kvm_pmd_huge(*pmd)) { | |
229 | hva_t hva = gfn_to_hva(kvm, addr >> PAGE_SHIFT); | |
230 | kvm_flush_dcache_to_poc((void*)hva, PMD_SIZE); | |
231 | } else { | |
232 | stage2_flush_ptes(kvm, pmd, addr, next); | |
233 | } | |
234 | } | |
235 | } while (pmd++, addr = next, addr != end); | |
236 | } | |
237 | ||
238 | static void stage2_flush_puds(struct kvm *kvm, pgd_t *pgd, | |
239 | phys_addr_t addr, phys_addr_t end) | |
240 | { | |
241 | pud_t *pud; | |
242 | phys_addr_t next; | |
243 | ||
244 | pud = pud_offset(pgd, addr); | |
245 | do { | |
246 | next = kvm_pud_addr_end(addr, end); | |
247 | if (!pud_none(*pud)) { | |
248 | if (pud_huge(*pud)) { | |
249 | hva_t hva = gfn_to_hva(kvm, addr >> PAGE_SHIFT); | |
250 | kvm_flush_dcache_to_poc((void*)hva, PUD_SIZE); | |
251 | } else { | |
252 | stage2_flush_pmds(kvm, pud, addr, next); | |
253 | } | |
254 | } | |
255 | } while (pud++, addr = next, addr != end); | |
256 | } | |
257 | ||
258 | static void stage2_flush_memslot(struct kvm *kvm, | |
259 | struct kvm_memory_slot *memslot) | |
260 | { | |
261 | phys_addr_t addr = memslot->base_gfn << PAGE_SHIFT; | |
262 | phys_addr_t end = addr + PAGE_SIZE * memslot->npages; | |
263 | phys_addr_t next; | |
264 | pgd_t *pgd; | |
265 | ||
266 | pgd = kvm->arch.pgd + pgd_index(addr); | |
267 | do { | |
268 | next = kvm_pgd_addr_end(addr, end); | |
269 | stage2_flush_puds(kvm, pgd, addr, next); | |
270 | } while (pgd++, addr = next, addr != end); | |
271 | } | |
272 | ||
273 | /** | |
274 | * stage2_flush_vm - Invalidate cache for pages mapped in stage 2 | |
275 | * @kvm: The struct kvm pointer | |
276 | * | |
277 | * Go through the stage 2 page tables and invalidate any cache lines | |
278 | * backing memory already mapped to the VM. | |
279 | */ | |
280 | void stage2_flush_vm(struct kvm *kvm) | |
281 | { | |
282 | struct kvm_memslots *slots; | |
283 | struct kvm_memory_slot *memslot; | |
284 | int idx; | |
285 | ||
286 | idx = srcu_read_lock(&kvm->srcu); | |
287 | spin_lock(&kvm->mmu_lock); | |
288 | ||
289 | slots = kvm_memslots(kvm); | |
290 | kvm_for_each_memslot(memslot, slots) | |
291 | stage2_flush_memslot(kvm, memslot); | |
292 | ||
293 | spin_unlock(&kvm->mmu_lock); | |
294 | srcu_read_unlock(&kvm->srcu, idx); | |
295 | } | |
296 | ||
d157f4a5 MZ |
297 | /** |
298 | * free_boot_hyp_pgd - free HYP boot page tables | |
299 | * | |
300 | * Free the HYP boot page tables. The bounce page is also freed. | |
301 | */ | |
302 | void free_boot_hyp_pgd(void) | |
303 | { | |
304 | mutex_lock(&kvm_hyp_pgd_mutex); | |
305 | ||
306 | if (boot_hyp_pgd) { | |
d4cb9df5 MZ |
307 | unmap_range(NULL, boot_hyp_pgd, hyp_idmap_start, PAGE_SIZE); |
308 | unmap_range(NULL, boot_hyp_pgd, TRAMPOLINE_VA, PAGE_SIZE); | |
38f791a4 | 309 | free_pages((unsigned long)boot_hyp_pgd, hyp_pgd_order); |
d157f4a5 MZ |
310 | boot_hyp_pgd = NULL; |
311 | } | |
312 | ||
313 | if (hyp_pgd) | |
d4cb9df5 | 314 | unmap_range(NULL, hyp_pgd, TRAMPOLINE_VA, PAGE_SIZE); |
d157f4a5 | 315 | |
5d4e08c4 | 316 | free_page((unsigned long)init_bounce_page); |
d157f4a5 MZ |
317 | init_bounce_page = NULL; |
318 | ||
319 | mutex_unlock(&kvm_hyp_pgd_mutex); | |
320 | } | |
321 | ||
342cd0ab | 322 | /** |
4f728276 | 323 | * free_hyp_pgds - free Hyp-mode page tables |
342cd0ab | 324 | * |
5a677ce0 MZ |
325 | * Assumes hyp_pgd is a page table used strictly in Hyp-mode and |
326 | * therefore contains either mappings in the kernel memory area (above | |
327 | * PAGE_OFFSET), or device mappings in the vmalloc range (from | |
328 | * VMALLOC_START to VMALLOC_END). | |
329 | * | |
330 | * boot_hyp_pgd should only map two pages for the init code. | |
342cd0ab | 331 | */ |
4f728276 | 332 | void free_hyp_pgds(void) |
342cd0ab | 333 | { |
342cd0ab CD |
334 | unsigned long addr; |
335 | ||
d157f4a5 | 336 | free_boot_hyp_pgd(); |
4f728276 | 337 | |
d157f4a5 | 338 | mutex_lock(&kvm_hyp_pgd_mutex); |
5a677ce0 | 339 | |
4f728276 MZ |
340 | if (hyp_pgd) { |
341 | for (addr = PAGE_OFFSET; virt_addr_valid(addr); addr += PGDIR_SIZE) | |
d4cb9df5 | 342 | unmap_range(NULL, hyp_pgd, KERN_TO_HYP(addr), PGDIR_SIZE); |
4f728276 | 343 | for (addr = VMALLOC_START; is_vmalloc_addr((void*)addr); addr += PGDIR_SIZE) |
d4cb9df5 MZ |
344 | unmap_range(NULL, hyp_pgd, KERN_TO_HYP(addr), PGDIR_SIZE); |
345 | ||
38f791a4 | 346 | free_pages((unsigned long)hyp_pgd, hyp_pgd_order); |
d157f4a5 | 347 | hyp_pgd = NULL; |
4f728276 MZ |
348 | } |
349 | ||
342cd0ab CD |
350 | mutex_unlock(&kvm_hyp_pgd_mutex); |
351 | } | |
352 | ||
353 | static void create_hyp_pte_mappings(pmd_t *pmd, unsigned long start, | |
6060df84 MZ |
354 | unsigned long end, unsigned long pfn, |
355 | pgprot_t prot) | |
342cd0ab CD |
356 | { |
357 | pte_t *pte; | |
358 | unsigned long addr; | |
342cd0ab | 359 | |
3562c76d MZ |
360 | addr = start; |
361 | do { | |
6060df84 MZ |
362 | pte = pte_offset_kernel(pmd, addr); |
363 | kvm_set_pte(pte, pfn_pte(pfn, prot)); | |
4f728276 | 364 | get_page(virt_to_page(pte)); |
5a677ce0 | 365 | kvm_flush_dcache_to_poc(pte, sizeof(*pte)); |
6060df84 | 366 | pfn++; |
3562c76d | 367 | } while (addr += PAGE_SIZE, addr != end); |
342cd0ab CD |
368 | } |
369 | ||
370 | static int create_hyp_pmd_mappings(pud_t *pud, unsigned long start, | |
6060df84 MZ |
371 | unsigned long end, unsigned long pfn, |
372 | pgprot_t prot) | |
342cd0ab CD |
373 | { |
374 | pmd_t *pmd; | |
375 | pte_t *pte; | |
376 | unsigned long addr, next; | |
377 | ||
3562c76d MZ |
378 | addr = start; |
379 | do { | |
6060df84 | 380 | pmd = pmd_offset(pud, addr); |
342cd0ab CD |
381 | |
382 | BUG_ON(pmd_sect(*pmd)); | |
383 | ||
384 | if (pmd_none(*pmd)) { | |
6060df84 | 385 | pte = pte_alloc_one_kernel(NULL, addr); |
342cd0ab CD |
386 | if (!pte) { |
387 | kvm_err("Cannot allocate Hyp pte\n"); | |
388 | return -ENOMEM; | |
389 | } | |
390 | pmd_populate_kernel(NULL, pmd, pte); | |
4f728276 | 391 | get_page(virt_to_page(pmd)); |
5a677ce0 | 392 | kvm_flush_dcache_to_poc(pmd, sizeof(*pmd)); |
342cd0ab CD |
393 | } |
394 | ||
395 | next = pmd_addr_end(addr, end); | |
396 | ||
6060df84 MZ |
397 | create_hyp_pte_mappings(pmd, addr, next, pfn, prot); |
398 | pfn += (next - addr) >> PAGE_SHIFT; | |
3562c76d | 399 | } while (addr = next, addr != end); |
342cd0ab CD |
400 | |
401 | return 0; | |
402 | } | |
403 | ||
38f791a4 CD |
404 | static int create_hyp_pud_mappings(pgd_t *pgd, unsigned long start, |
405 | unsigned long end, unsigned long pfn, | |
406 | pgprot_t prot) | |
407 | { | |
408 | pud_t *pud; | |
409 | pmd_t *pmd; | |
410 | unsigned long addr, next; | |
411 | int ret; | |
412 | ||
413 | addr = start; | |
414 | do { | |
415 | pud = pud_offset(pgd, addr); | |
416 | ||
417 | if (pud_none_or_clear_bad(pud)) { | |
418 | pmd = pmd_alloc_one(NULL, addr); | |
419 | if (!pmd) { | |
420 | kvm_err("Cannot allocate Hyp pmd\n"); | |
421 | return -ENOMEM; | |
422 | } | |
423 | pud_populate(NULL, pud, pmd); | |
424 | get_page(virt_to_page(pud)); | |
425 | kvm_flush_dcache_to_poc(pud, sizeof(*pud)); | |
426 | } | |
427 | ||
428 | next = pud_addr_end(addr, end); | |
429 | ret = create_hyp_pmd_mappings(pud, addr, next, pfn, prot); | |
430 | if (ret) | |
431 | return ret; | |
432 | pfn += (next - addr) >> PAGE_SHIFT; | |
433 | } while (addr = next, addr != end); | |
434 | ||
435 | return 0; | |
436 | } | |
437 | ||
6060df84 MZ |
438 | static int __create_hyp_mappings(pgd_t *pgdp, |
439 | unsigned long start, unsigned long end, | |
440 | unsigned long pfn, pgprot_t prot) | |
342cd0ab | 441 | { |
342cd0ab CD |
442 | pgd_t *pgd; |
443 | pud_t *pud; | |
342cd0ab CD |
444 | unsigned long addr, next; |
445 | int err = 0; | |
446 | ||
342cd0ab | 447 | mutex_lock(&kvm_hyp_pgd_mutex); |
3562c76d MZ |
448 | addr = start & PAGE_MASK; |
449 | end = PAGE_ALIGN(end); | |
450 | do { | |
6060df84 | 451 | pgd = pgdp + pgd_index(addr); |
342cd0ab | 452 | |
38f791a4 CD |
453 | if (pgd_none(*pgd)) { |
454 | pud = pud_alloc_one(NULL, addr); | |
455 | if (!pud) { | |
456 | kvm_err("Cannot allocate Hyp pud\n"); | |
342cd0ab CD |
457 | err = -ENOMEM; |
458 | goto out; | |
459 | } | |
38f791a4 CD |
460 | pgd_populate(NULL, pgd, pud); |
461 | get_page(virt_to_page(pgd)); | |
462 | kvm_flush_dcache_to_poc(pgd, sizeof(*pgd)); | |
342cd0ab CD |
463 | } |
464 | ||
465 | next = pgd_addr_end(addr, end); | |
38f791a4 | 466 | err = create_hyp_pud_mappings(pgd, addr, next, pfn, prot); |
342cd0ab CD |
467 | if (err) |
468 | goto out; | |
6060df84 | 469 | pfn += (next - addr) >> PAGE_SHIFT; |
3562c76d | 470 | } while (addr = next, addr != end); |
342cd0ab CD |
471 | out: |
472 | mutex_unlock(&kvm_hyp_pgd_mutex); | |
473 | return err; | |
474 | } | |
475 | ||
40c2729b CD |
476 | static phys_addr_t kvm_kaddr_to_phys(void *kaddr) |
477 | { | |
478 | if (!is_vmalloc_addr(kaddr)) { | |
479 | BUG_ON(!virt_addr_valid(kaddr)); | |
480 | return __pa(kaddr); | |
481 | } else { | |
482 | return page_to_phys(vmalloc_to_page(kaddr)) + | |
483 | offset_in_page(kaddr); | |
484 | } | |
485 | } | |
486 | ||
342cd0ab | 487 | /** |
06e8c3b0 | 488 | * create_hyp_mappings - duplicate a kernel virtual address range in Hyp mode |
342cd0ab CD |
489 | * @from: The virtual kernel start address of the range |
490 | * @to: The virtual kernel end address of the range (exclusive) | |
491 | * | |
06e8c3b0 MZ |
492 | * The same virtual address as the kernel virtual address is also used |
493 | * in Hyp-mode mapping (modulo HYP_PAGE_OFFSET) to the same underlying | |
494 | * physical pages. | |
342cd0ab CD |
495 | */ |
496 | int create_hyp_mappings(void *from, void *to) | |
497 | { | |
40c2729b CD |
498 | phys_addr_t phys_addr; |
499 | unsigned long virt_addr; | |
6060df84 MZ |
500 | unsigned long start = KERN_TO_HYP((unsigned long)from); |
501 | unsigned long end = KERN_TO_HYP((unsigned long)to); | |
502 | ||
40c2729b CD |
503 | start = start & PAGE_MASK; |
504 | end = PAGE_ALIGN(end); | |
6060df84 | 505 | |
40c2729b CD |
506 | for (virt_addr = start; virt_addr < end; virt_addr += PAGE_SIZE) { |
507 | int err; | |
6060df84 | 508 | |
40c2729b CD |
509 | phys_addr = kvm_kaddr_to_phys(from + virt_addr - start); |
510 | err = __create_hyp_mappings(hyp_pgd, virt_addr, | |
511 | virt_addr + PAGE_SIZE, | |
512 | __phys_to_pfn(phys_addr), | |
513 | PAGE_HYP); | |
514 | if (err) | |
515 | return err; | |
516 | } | |
517 | ||
518 | return 0; | |
342cd0ab CD |
519 | } |
520 | ||
521 | /** | |
06e8c3b0 MZ |
522 | * create_hyp_io_mappings - duplicate a kernel IO mapping into Hyp mode |
523 | * @from: The kernel start VA of the range | |
524 | * @to: The kernel end VA of the range (exclusive) | |
6060df84 | 525 | * @phys_addr: The physical start address which gets mapped |
06e8c3b0 MZ |
526 | * |
527 | * The resulting HYP VA is the same as the kernel VA, modulo | |
528 | * HYP_PAGE_OFFSET. | |
342cd0ab | 529 | */ |
6060df84 | 530 | int create_hyp_io_mappings(void *from, void *to, phys_addr_t phys_addr) |
342cd0ab | 531 | { |
6060df84 MZ |
532 | unsigned long start = KERN_TO_HYP((unsigned long)from); |
533 | unsigned long end = KERN_TO_HYP((unsigned long)to); | |
534 | ||
535 | /* Check for a valid kernel IO mapping */ | |
536 | if (!is_vmalloc_addr(from) || !is_vmalloc_addr(to - 1)) | |
537 | return -EINVAL; | |
538 | ||
539 | return __create_hyp_mappings(hyp_pgd, start, end, | |
540 | __phys_to_pfn(phys_addr), PAGE_HYP_DEVICE); | |
342cd0ab CD |
541 | } |
542 | ||
d5d8184d CD |
543 | /** |
544 | * kvm_alloc_stage2_pgd - allocate level-1 table for stage-2 translation. | |
545 | * @kvm: The KVM struct pointer for the VM. | |
546 | * | |
547 | * Allocates the 1st level table only of size defined by S2_PGD_ORDER (can | |
548 | * support either full 40-bit input addresses or limited to 32-bit input | |
549 | * addresses). Clears the allocated pages. | |
550 | * | |
551 | * Note we don't need locking here as this is only called when the VM is | |
552 | * created, which can only be done once. | |
553 | */ | |
554 | int kvm_alloc_stage2_pgd(struct kvm *kvm) | |
555 | { | |
38f791a4 | 556 | int ret; |
d5d8184d CD |
557 | pgd_t *pgd; |
558 | ||
559 | if (kvm->arch.pgd != NULL) { | |
560 | kvm_err("kvm_arch already initialized?\n"); | |
561 | return -EINVAL; | |
562 | } | |
563 | ||
38f791a4 CD |
564 | if (KVM_PREALLOC_LEVEL > 0) { |
565 | /* | |
566 | * Allocate fake pgd for the page table manipulation macros to | |
567 | * work. This is not used by the hardware and we have no | |
568 | * alignment requirement for this allocation. | |
569 | */ | |
570 | pgd = (pgd_t *)kmalloc(PTRS_PER_S2_PGD * sizeof(pgd_t), | |
571 | GFP_KERNEL | __GFP_ZERO); | |
572 | } else { | |
573 | /* | |
574 | * Allocate actual first-level Stage-2 page table used by the | |
575 | * hardware for Stage-2 page table walks. | |
576 | */ | |
577 | pgd = (pgd_t *)__get_free_pages(GFP_KERNEL | __GFP_ZERO, S2_PGD_ORDER); | |
578 | } | |
579 | ||
d5d8184d CD |
580 | if (!pgd) |
581 | return -ENOMEM; | |
582 | ||
38f791a4 CD |
583 | ret = kvm_prealloc_hwpgd(kvm, pgd); |
584 | if (ret) | |
585 | goto out_err; | |
586 | ||
c62ee2b2 | 587 | kvm_clean_pgd(pgd); |
d5d8184d | 588 | kvm->arch.pgd = pgd; |
d5d8184d | 589 | return 0; |
38f791a4 CD |
590 | out_err: |
591 | if (KVM_PREALLOC_LEVEL > 0) | |
592 | kfree(pgd); | |
593 | else | |
594 | free_pages((unsigned long)pgd, S2_PGD_ORDER); | |
595 | return ret; | |
d5d8184d CD |
596 | } |
597 | ||
d5d8184d CD |
598 | /** |
599 | * unmap_stage2_range -- Clear stage2 page table entries to unmap a range | |
600 | * @kvm: The VM pointer | |
601 | * @start: The intermediate physical base address of the range to unmap | |
602 | * @size: The size of the area to unmap | |
603 | * | |
604 | * Clear a range of stage-2 mappings, lowering the various ref-counts. Must | |
605 | * be called while holding mmu_lock (unless for freeing the stage2 pgd before | |
606 | * destroying the VM), otherwise another faulting VCPU may come in and mess | |
607 | * with things behind our backs. | |
608 | */ | |
609 | static void unmap_stage2_range(struct kvm *kvm, phys_addr_t start, u64 size) | |
610 | { | |
d4cb9df5 | 611 | unmap_range(kvm, kvm->arch.pgd, start, size); |
d5d8184d CD |
612 | } |
613 | ||
614 | /** | |
615 | * kvm_free_stage2_pgd - free all stage-2 tables | |
616 | * @kvm: The KVM struct pointer for the VM. | |
617 | * | |
618 | * Walks the level-1 page table pointed to by kvm->arch.pgd and frees all | |
619 | * underlying level-2 and level-3 tables before freeing the actual level-1 table | |
620 | * and setting the struct pointer to NULL. | |
621 | * | |
622 | * Note we don't need locking here as this is only called when the VM is | |
623 | * destroyed, which can only be done once. | |
624 | */ | |
625 | void kvm_free_stage2_pgd(struct kvm *kvm) | |
626 | { | |
627 | if (kvm->arch.pgd == NULL) | |
628 | return; | |
629 | ||
630 | unmap_stage2_range(kvm, 0, KVM_PHYS_SIZE); | |
38f791a4 CD |
631 | kvm_free_hwpgd(kvm); |
632 | if (KVM_PREALLOC_LEVEL > 0) | |
633 | kfree(kvm->arch.pgd); | |
634 | else | |
635 | free_pages((unsigned long)kvm->arch.pgd, S2_PGD_ORDER); | |
d5d8184d CD |
636 | kvm->arch.pgd = NULL; |
637 | } | |
638 | ||
38f791a4 | 639 | static pud_t *stage2_get_pud(struct kvm *kvm, struct kvm_mmu_memory_cache *cache, |
ad361f09 | 640 | phys_addr_t addr) |
d5d8184d CD |
641 | { |
642 | pgd_t *pgd; | |
643 | pud_t *pud; | |
d5d8184d | 644 | |
d5d8184d | 645 | pgd = kvm->arch.pgd + pgd_index(addr); |
38f791a4 CD |
646 | if (WARN_ON(pgd_none(*pgd))) { |
647 | if (!cache) | |
648 | return NULL; | |
649 | pud = mmu_memory_cache_alloc(cache); | |
650 | pgd_populate(NULL, pgd, pud); | |
651 | get_page(virt_to_page(pgd)); | |
652 | } | |
653 | ||
654 | return pud_offset(pgd, addr); | |
655 | } | |
656 | ||
657 | static pmd_t *stage2_get_pmd(struct kvm *kvm, struct kvm_mmu_memory_cache *cache, | |
658 | phys_addr_t addr) | |
659 | { | |
660 | pud_t *pud; | |
661 | pmd_t *pmd; | |
662 | ||
663 | pud = stage2_get_pud(kvm, cache, addr); | |
d5d8184d CD |
664 | if (pud_none(*pud)) { |
665 | if (!cache) | |
ad361f09 | 666 | return NULL; |
d5d8184d CD |
667 | pmd = mmu_memory_cache_alloc(cache); |
668 | pud_populate(NULL, pud, pmd); | |
d5d8184d | 669 | get_page(virt_to_page(pud)); |
c62ee2b2 MZ |
670 | } |
671 | ||
ad361f09 CD |
672 | return pmd_offset(pud, addr); |
673 | } | |
674 | ||
675 | static int stage2_set_pmd_huge(struct kvm *kvm, struct kvm_mmu_memory_cache | |
676 | *cache, phys_addr_t addr, const pmd_t *new_pmd) | |
677 | { | |
678 | pmd_t *pmd, old_pmd; | |
679 | ||
680 | pmd = stage2_get_pmd(kvm, cache, addr); | |
681 | VM_BUG_ON(!pmd); | |
d5d8184d | 682 | |
ad361f09 CD |
683 | /* |
684 | * Mapping in huge pages should only happen through a fault. If a | |
685 | * page is merged into a transparent huge page, the individual | |
686 | * subpages of that huge page should be unmapped through MMU | |
687 | * notifiers before we get here. | |
688 | * | |
689 | * Merging of CompoundPages is not supported; they should become | |
690 | * splitting first, unmapped, merged, and mapped back in on-demand. | |
691 | */ | |
692 | VM_BUG_ON(pmd_present(*pmd) && pmd_pfn(*pmd) != pmd_pfn(*new_pmd)); | |
693 | ||
694 | old_pmd = *pmd; | |
695 | kvm_set_pmd(pmd, *new_pmd); | |
696 | if (pmd_present(old_pmd)) | |
697 | kvm_tlb_flush_vmid_ipa(kvm, addr); | |
698 | else | |
699 | get_page(virt_to_page(pmd)); | |
700 | return 0; | |
701 | } | |
702 | ||
703 | static int stage2_set_pte(struct kvm *kvm, struct kvm_mmu_memory_cache *cache, | |
704 | phys_addr_t addr, const pte_t *new_pte, bool iomap) | |
705 | { | |
706 | pmd_t *pmd; | |
707 | pte_t *pte, old_pte; | |
708 | ||
38f791a4 | 709 | /* Create stage-2 page table mapping - Levels 0 and 1 */ |
ad361f09 CD |
710 | pmd = stage2_get_pmd(kvm, cache, addr); |
711 | if (!pmd) { | |
712 | /* | |
713 | * Ignore calls from kvm_set_spte_hva for unallocated | |
714 | * address ranges. | |
715 | */ | |
716 | return 0; | |
717 | } | |
718 | ||
719 | /* Create stage-2 page mappings - Level 2 */ | |
d5d8184d CD |
720 | if (pmd_none(*pmd)) { |
721 | if (!cache) | |
722 | return 0; /* ignore calls from kvm_set_spte_hva */ | |
723 | pte = mmu_memory_cache_alloc(cache); | |
c62ee2b2 | 724 | kvm_clean_pte(pte); |
d5d8184d | 725 | pmd_populate_kernel(NULL, pmd, pte); |
d5d8184d | 726 | get_page(virt_to_page(pmd)); |
c62ee2b2 MZ |
727 | } |
728 | ||
729 | pte = pte_offset_kernel(pmd, addr); | |
d5d8184d CD |
730 | |
731 | if (iomap && pte_present(*pte)) | |
732 | return -EFAULT; | |
733 | ||
734 | /* Create 2nd stage page table mapping - Level 3 */ | |
735 | old_pte = *pte; | |
736 | kvm_set_pte(pte, *new_pte); | |
737 | if (pte_present(old_pte)) | |
48762767 | 738 | kvm_tlb_flush_vmid_ipa(kvm, addr); |
d5d8184d CD |
739 | else |
740 | get_page(virt_to_page(pte)); | |
741 | ||
742 | return 0; | |
743 | } | |
744 | ||
745 | /** | |
746 | * kvm_phys_addr_ioremap - map a device range to guest IPA | |
747 | * | |
748 | * @kvm: The KVM pointer | |
749 | * @guest_ipa: The IPA at which to insert the mapping | |
750 | * @pa: The physical address of the device | |
751 | * @size: The size of the mapping | |
752 | */ | |
753 | int kvm_phys_addr_ioremap(struct kvm *kvm, phys_addr_t guest_ipa, | |
c40f2f8f | 754 | phys_addr_t pa, unsigned long size, bool writable) |
d5d8184d CD |
755 | { |
756 | phys_addr_t addr, end; | |
757 | int ret = 0; | |
758 | unsigned long pfn; | |
759 | struct kvm_mmu_memory_cache cache = { 0, }; | |
760 | ||
761 | end = (guest_ipa + size + PAGE_SIZE - 1) & PAGE_MASK; | |
762 | pfn = __phys_to_pfn(pa); | |
763 | ||
764 | for (addr = guest_ipa; addr < end; addr += PAGE_SIZE) { | |
c62ee2b2 | 765 | pte_t pte = pfn_pte(pfn, PAGE_S2_DEVICE); |
d5d8184d | 766 | |
c40f2f8f AB |
767 | if (writable) |
768 | kvm_set_s2pte_writable(&pte); | |
769 | ||
38f791a4 CD |
770 | ret = mmu_topup_memory_cache(&cache, KVM_MMU_CACHE_MIN_PAGES, |
771 | KVM_NR_MEM_OBJS); | |
d5d8184d CD |
772 | if (ret) |
773 | goto out; | |
774 | spin_lock(&kvm->mmu_lock); | |
775 | ret = stage2_set_pte(kvm, &cache, addr, &pte, true); | |
776 | spin_unlock(&kvm->mmu_lock); | |
777 | if (ret) | |
778 | goto out; | |
779 | ||
780 | pfn++; | |
781 | } | |
782 | ||
783 | out: | |
784 | mmu_free_memory_cache(&cache); | |
785 | return ret; | |
786 | } | |
787 | ||
9b5fdb97 CD |
788 | static bool transparent_hugepage_adjust(pfn_t *pfnp, phys_addr_t *ipap) |
789 | { | |
790 | pfn_t pfn = *pfnp; | |
791 | gfn_t gfn = *ipap >> PAGE_SHIFT; | |
792 | ||
793 | if (PageTransCompound(pfn_to_page(pfn))) { | |
794 | unsigned long mask; | |
795 | /* | |
796 | * The address we faulted on is backed by a transparent huge | |
797 | * page. However, because we map the compound huge page and | |
798 | * not the individual tail page, we need to transfer the | |
799 | * refcount to the head page. We have to be careful that the | |
800 | * THP doesn't start to split while we are adjusting the | |
801 | * refcounts. | |
802 | * | |
803 | * We are sure this doesn't happen, because mmu_notifier_retry | |
804 | * was successful and we are holding the mmu_lock, so if this | |
805 | * THP is trying to split, it will be blocked in the mmu | |
806 | * notifier before touching any of the pages, specifically | |
807 | * before being able to call __split_huge_page_refcount(). | |
808 | * | |
809 | * We can therefore safely transfer the refcount from PG_tail | |
810 | * to PG_head and switch the pfn from a tail page to the head | |
811 | * page accordingly. | |
812 | */ | |
813 | mask = PTRS_PER_PMD - 1; | |
814 | VM_BUG_ON((gfn & mask) != (pfn & mask)); | |
815 | if (pfn & mask) { | |
816 | *ipap &= PMD_MASK; | |
817 | kvm_release_pfn_clean(pfn); | |
818 | pfn &= ~mask; | |
819 | kvm_get_pfn(pfn); | |
820 | *pfnp = pfn; | |
821 | } | |
822 | ||
823 | return true; | |
824 | } | |
825 | ||
826 | return false; | |
827 | } | |
828 | ||
a7d079ce AB |
829 | static bool kvm_is_write_fault(struct kvm_vcpu *vcpu) |
830 | { | |
831 | if (kvm_vcpu_trap_is_iabt(vcpu)) | |
832 | return false; | |
833 | ||
834 | return kvm_vcpu_dabt_iswrite(vcpu); | |
835 | } | |
836 | ||
94f8e641 | 837 | static int user_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa, |
98047888 | 838 | struct kvm_memory_slot *memslot, unsigned long hva, |
94f8e641 CD |
839 | unsigned long fault_status) |
840 | { | |
94f8e641 | 841 | int ret; |
9b5fdb97 | 842 | bool write_fault, writable, hugetlb = false, force_pte = false; |
94f8e641 | 843 | unsigned long mmu_seq; |
ad361f09 | 844 | gfn_t gfn = fault_ipa >> PAGE_SHIFT; |
ad361f09 | 845 | struct kvm *kvm = vcpu->kvm; |
94f8e641 | 846 | struct kvm_mmu_memory_cache *memcache = &vcpu->arch.mmu_page_cache; |
ad361f09 CD |
847 | struct vm_area_struct *vma; |
848 | pfn_t pfn; | |
b8865767 | 849 | pgprot_t mem_type = PAGE_S2; |
94f8e641 | 850 | |
a7d079ce | 851 | write_fault = kvm_is_write_fault(vcpu); |
94f8e641 CD |
852 | if (fault_status == FSC_PERM && !write_fault) { |
853 | kvm_err("Unexpected L2 read permission error\n"); | |
854 | return -EFAULT; | |
855 | } | |
856 | ||
ad361f09 CD |
857 | /* Let's check if we will get back a huge page backed by hugetlbfs */ |
858 | down_read(¤t->mm->mmap_sem); | |
859 | vma = find_vma_intersection(current->mm, hva, hva + 1); | |
37b54408 AB |
860 | if (unlikely(!vma)) { |
861 | kvm_err("Failed to find VMA for hva 0x%lx\n", hva); | |
862 | up_read(¤t->mm->mmap_sem); | |
863 | return -EFAULT; | |
864 | } | |
865 | ||
ad361f09 CD |
866 | if (is_vm_hugetlb_page(vma)) { |
867 | hugetlb = true; | |
868 | gfn = (fault_ipa & PMD_MASK) >> PAGE_SHIFT; | |
9b5fdb97 CD |
869 | } else { |
870 | /* | |
136d737f MZ |
871 | * Pages belonging to memslots that don't have the same |
872 | * alignment for userspace and IPA cannot be mapped using | |
873 | * block descriptors even if the pages belong to a THP for | |
874 | * the process, because the stage-2 block descriptor will | |
875 | * cover more than a single THP and we loose atomicity for | |
876 | * unmapping, updates, and splits of the THP or other pages | |
877 | * in the stage-2 block range. | |
9b5fdb97 | 878 | */ |
136d737f MZ |
879 | if ((memslot->userspace_addr & ~PMD_MASK) != |
880 | ((memslot->base_gfn << PAGE_SHIFT) & ~PMD_MASK)) | |
9b5fdb97 | 881 | force_pte = true; |
ad361f09 CD |
882 | } |
883 | up_read(¤t->mm->mmap_sem); | |
884 | ||
94f8e641 | 885 | /* We need minimum second+third level pages */ |
38f791a4 CD |
886 | ret = mmu_topup_memory_cache(memcache, KVM_MMU_CACHE_MIN_PAGES, |
887 | KVM_NR_MEM_OBJS); | |
94f8e641 CD |
888 | if (ret) |
889 | return ret; | |
890 | ||
891 | mmu_seq = vcpu->kvm->mmu_notifier_seq; | |
892 | /* | |
893 | * Ensure the read of mmu_notifier_seq happens before we call | |
894 | * gfn_to_pfn_prot (which calls get_user_pages), so that we don't risk | |
895 | * the page we just got a reference to gets unmapped before we have a | |
896 | * chance to grab the mmu_lock, which ensure that if the page gets | |
897 | * unmapped afterwards, the call to kvm_unmap_hva will take it away | |
898 | * from us again properly. This smp_rmb() interacts with the smp_wmb() | |
899 | * in kvm_mmu_notifier_invalidate_<page|range_end>. | |
900 | */ | |
901 | smp_rmb(); | |
902 | ||
ad361f09 | 903 | pfn = gfn_to_pfn_prot(kvm, gfn, write_fault, &writable); |
94f8e641 CD |
904 | if (is_error_pfn(pfn)) |
905 | return -EFAULT; | |
906 | ||
b8865767 KP |
907 | if (kvm_is_mmio_pfn(pfn)) |
908 | mem_type = PAGE_S2_DEVICE; | |
909 | ||
ad361f09 CD |
910 | spin_lock(&kvm->mmu_lock); |
911 | if (mmu_notifier_retry(kvm, mmu_seq)) | |
94f8e641 | 912 | goto out_unlock; |
9b5fdb97 CD |
913 | if (!hugetlb && !force_pte) |
914 | hugetlb = transparent_hugepage_adjust(&pfn, &fault_ipa); | |
ad361f09 CD |
915 | |
916 | if (hugetlb) { | |
b8865767 | 917 | pmd_t new_pmd = pfn_pmd(pfn, mem_type); |
ad361f09 CD |
918 | new_pmd = pmd_mkhuge(new_pmd); |
919 | if (writable) { | |
920 | kvm_set_s2pmd_writable(&new_pmd); | |
921 | kvm_set_pfn_dirty(pfn); | |
922 | } | |
2d58b733 | 923 | coherent_cache_guest_page(vcpu, hva & PMD_MASK, PMD_SIZE); |
ad361f09 CD |
924 | ret = stage2_set_pmd_huge(kvm, memcache, fault_ipa, &new_pmd); |
925 | } else { | |
b8865767 | 926 | pte_t new_pte = pfn_pte(pfn, mem_type); |
ad361f09 CD |
927 | if (writable) { |
928 | kvm_set_s2pte_writable(&new_pte); | |
929 | kvm_set_pfn_dirty(pfn); | |
930 | } | |
2d58b733 | 931 | coherent_cache_guest_page(vcpu, hva, PAGE_SIZE); |
b8865767 | 932 | ret = stage2_set_pte(kvm, memcache, fault_ipa, &new_pte, |
3d08c629 | 933 | pgprot_val(mem_type) == pgprot_val(PAGE_S2_DEVICE)); |
94f8e641 | 934 | } |
ad361f09 | 935 | |
94f8e641 CD |
936 | |
937 | out_unlock: | |
ad361f09 | 938 | spin_unlock(&kvm->mmu_lock); |
94f8e641 | 939 | kvm_release_pfn_clean(pfn); |
ad361f09 | 940 | return ret; |
94f8e641 CD |
941 | } |
942 | ||
943 | /** | |
944 | * kvm_handle_guest_abort - handles all 2nd stage aborts | |
945 | * @vcpu: the VCPU pointer | |
946 | * @run: the kvm_run structure | |
947 | * | |
948 | * Any abort that gets to the host is almost guaranteed to be caused by a | |
949 | * missing second stage translation table entry, which can mean that either the | |
950 | * guest simply needs more memory and we must allocate an appropriate page or it | |
951 | * can mean that the guest tried to access I/O memory, which is emulated by user | |
952 | * space. The distinction is based on the IPA causing the fault and whether this | |
953 | * memory region has been registered as standard RAM by user space. | |
954 | */ | |
342cd0ab CD |
955 | int kvm_handle_guest_abort(struct kvm_vcpu *vcpu, struct kvm_run *run) |
956 | { | |
94f8e641 CD |
957 | unsigned long fault_status; |
958 | phys_addr_t fault_ipa; | |
959 | struct kvm_memory_slot *memslot; | |
98047888 CD |
960 | unsigned long hva; |
961 | bool is_iabt, write_fault, writable; | |
94f8e641 CD |
962 | gfn_t gfn; |
963 | int ret, idx; | |
964 | ||
52d1dba9 | 965 | is_iabt = kvm_vcpu_trap_is_iabt(vcpu); |
7393b599 | 966 | fault_ipa = kvm_vcpu_get_fault_ipa(vcpu); |
94f8e641 | 967 | |
7393b599 MZ |
968 | trace_kvm_guest_fault(*vcpu_pc(vcpu), kvm_vcpu_get_hsr(vcpu), |
969 | kvm_vcpu_get_hfar(vcpu), fault_ipa); | |
94f8e641 CD |
970 | |
971 | /* Check the stage-2 fault is trans. fault or write fault */ | |
0496daa5 | 972 | fault_status = kvm_vcpu_trap_get_fault_type(vcpu); |
94f8e641 | 973 | if (fault_status != FSC_FAULT && fault_status != FSC_PERM) { |
0496daa5 CD |
974 | kvm_err("Unsupported FSC: EC=%#x xFSC=%#lx ESR_EL2=%#lx\n", |
975 | kvm_vcpu_trap_get_class(vcpu), | |
976 | (unsigned long)kvm_vcpu_trap_get_fault(vcpu), | |
977 | (unsigned long)kvm_vcpu_get_hsr(vcpu)); | |
94f8e641 CD |
978 | return -EFAULT; |
979 | } | |
980 | ||
981 | idx = srcu_read_lock(&vcpu->kvm->srcu); | |
982 | ||
983 | gfn = fault_ipa >> PAGE_SHIFT; | |
98047888 CD |
984 | memslot = gfn_to_memslot(vcpu->kvm, gfn); |
985 | hva = gfn_to_hva_memslot_prot(memslot, gfn, &writable); | |
a7d079ce | 986 | write_fault = kvm_is_write_fault(vcpu); |
98047888 | 987 | if (kvm_is_error_hva(hva) || (write_fault && !writable)) { |
94f8e641 CD |
988 | if (is_iabt) { |
989 | /* Prefetch Abort on I/O address */ | |
7393b599 | 990 | kvm_inject_pabt(vcpu, kvm_vcpu_get_hfar(vcpu)); |
94f8e641 CD |
991 | ret = 1; |
992 | goto out_unlock; | |
993 | } | |
994 | ||
cfe3950c MZ |
995 | /* |
996 | * The IPA is reported as [MAX:12], so we need to | |
997 | * complement it with the bottom 12 bits from the | |
998 | * faulting VA. This is always 12 bits, irrespective | |
999 | * of the page size. | |
1000 | */ | |
1001 | fault_ipa |= kvm_vcpu_get_hfar(vcpu) & ((1 << 12) - 1); | |
45e96ea6 | 1002 | ret = io_mem_abort(vcpu, run, fault_ipa); |
94f8e641 CD |
1003 | goto out_unlock; |
1004 | } | |
1005 | ||
c3058d5d CD |
1006 | /* Userspace should not be able to register out-of-bounds IPAs */ |
1007 | VM_BUG_ON(fault_ipa >= KVM_PHYS_SIZE); | |
1008 | ||
98047888 | 1009 | ret = user_mem_abort(vcpu, fault_ipa, memslot, hva, fault_status); |
94f8e641 CD |
1010 | if (ret == 0) |
1011 | ret = 1; | |
1012 | out_unlock: | |
1013 | srcu_read_unlock(&vcpu->kvm->srcu, idx); | |
1014 | return ret; | |
342cd0ab CD |
1015 | } |
1016 | ||
d5d8184d CD |
1017 | static void handle_hva_to_gpa(struct kvm *kvm, |
1018 | unsigned long start, | |
1019 | unsigned long end, | |
1020 | void (*handler)(struct kvm *kvm, | |
1021 | gpa_t gpa, void *data), | |
1022 | void *data) | |
1023 | { | |
1024 | struct kvm_memslots *slots; | |
1025 | struct kvm_memory_slot *memslot; | |
1026 | ||
1027 | slots = kvm_memslots(kvm); | |
1028 | ||
1029 | /* we only care about the pages that the guest sees */ | |
1030 | kvm_for_each_memslot(memslot, slots) { | |
1031 | unsigned long hva_start, hva_end; | |
1032 | gfn_t gfn, gfn_end; | |
1033 | ||
1034 | hva_start = max(start, memslot->userspace_addr); | |
1035 | hva_end = min(end, memslot->userspace_addr + | |
1036 | (memslot->npages << PAGE_SHIFT)); | |
1037 | if (hva_start >= hva_end) | |
1038 | continue; | |
1039 | ||
1040 | /* | |
1041 | * {gfn(page) | page intersects with [hva_start, hva_end)} = | |
1042 | * {gfn_start, gfn_start+1, ..., gfn_end-1}. | |
1043 | */ | |
1044 | gfn = hva_to_gfn_memslot(hva_start, memslot); | |
1045 | gfn_end = hva_to_gfn_memslot(hva_end + PAGE_SIZE - 1, memslot); | |
1046 | ||
1047 | for (; gfn < gfn_end; ++gfn) { | |
1048 | gpa_t gpa = gfn << PAGE_SHIFT; | |
1049 | handler(kvm, gpa, data); | |
1050 | } | |
1051 | } | |
1052 | } | |
1053 | ||
1054 | static void kvm_unmap_hva_handler(struct kvm *kvm, gpa_t gpa, void *data) | |
1055 | { | |
1056 | unmap_stage2_range(kvm, gpa, PAGE_SIZE); | |
d5d8184d CD |
1057 | } |
1058 | ||
1059 | int kvm_unmap_hva(struct kvm *kvm, unsigned long hva) | |
1060 | { | |
1061 | unsigned long end = hva + PAGE_SIZE; | |
1062 | ||
1063 | if (!kvm->arch.pgd) | |
1064 | return 0; | |
1065 | ||
1066 | trace_kvm_unmap_hva(hva); | |
1067 | handle_hva_to_gpa(kvm, hva, end, &kvm_unmap_hva_handler, NULL); | |
1068 | return 0; | |
1069 | } | |
1070 | ||
1071 | int kvm_unmap_hva_range(struct kvm *kvm, | |
1072 | unsigned long start, unsigned long end) | |
1073 | { | |
1074 | if (!kvm->arch.pgd) | |
1075 | return 0; | |
1076 | ||
1077 | trace_kvm_unmap_hva_range(start, end); | |
1078 | handle_hva_to_gpa(kvm, start, end, &kvm_unmap_hva_handler, NULL); | |
1079 | return 0; | |
1080 | } | |
1081 | ||
1082 | static void kvm_set_spte_handler(struct kvm *kvm, gpa_t gpa, void *data) | |
1083 | { | |
1084 | pte_t *pte = (pte_t *)data; | |
1085 | ||
1086 | stage2_set_pte(kvm, NULL, gpa, pte, false); | |
1087 | } | |
1088 | ||
1089 | ||
1090 | void kvm_set_spte_hva(struct kvm *kvm, unsigned long hva, pte_t pte) | |
1091 | { | |
1092 | unsigned long end = hva + PAGE_SIZE; | |
1093 | pte_t stage2_pte; | |
1094 | ||
1095 | if (!kvm->arch.pgd) | |
1096 | return; | |
1097 | ||
1098 | trace_kvm_set_spte_hva(hva); | |
1099 | stage2_pte = pfn_pte(pte_pfn(pte), PAGE_S2); | |
1100 | handle_hva_to_gpa(kvm, hva, end, &kvm_set_spte_handler, &stage2_pte); | |
1101 | } | |
1102 | ||
1103 | void kvm_mmu_free_memory_caches(struct kvm_vcpu *vcpu) | |
1104 | { | |
1105 | mmu_free_memory_cache(&vcpu->arch.mmu_page_cache); | |
1106 | } | |
1107 | ||
342cd0ab CD |
1108 | phys_addr_t kvm_mmu_get_httbr(void) |
1109 | { | |
342cd0ab CD |
1110 | return virt_to_phys(hyp_pgd); |
1111 | } | |
1112 | ||
5a677ce0 MZ |
1113 | phys_addr_t kvm_mmu_get_boot_httbr(void) |
1114 | { | |
1115 | return virt_to_phys(boot_hyp_pgd); | |
1116 | } | |
1117 | ||
1118 | phys_addr_t kvm_get_idmap_vector(void) | |
1119 | { | |
1120 | return hyp_idmap_vector; | |
1121 | } | |
1122 | ||
342cd0ab CD |
1123 | int kvm_mmu_init(void) |
1124 | { | |
2fb41059 MZ |
1125 | int err; |
1126 | ||
4fda342c SS |
1127 | hyp_idmap_start = kvm_virt_to_phys(__hyp_idmap_text_start); |
1128 | hyp_idmap_end = kvm_virt_to_phys(__hyp_idmap_text_end); | |
1129 | hyp_idmap_vector = kvm_virt_to_phys(__kvm_hyp_init); | |
5a677ce0 MZ |
1130 | |
1131 | if ((hyp_idmap_start ^ hyp_idmap_end) & PAGE_MASK) { | |
1132 | /* | |
1133 | * Our init code is crossing a page boundary. Allocate | |
1134 | * a bounce page, copy the code over and use that. | |
1135 | */ | |
1136 | size_t len = __hyp_idmap_text_end - __hyp_idmap_text_start; | |
1137 | phys_addr_t phys_base; | |
1138 | ||
5d4e08c4 | 1139 | init_bounce_page = (void *)__get_free_page(GFP_KERNEL); |
5a677ce0 MZ |
1140 | if (!init_bounce_page) { |
1141 | kvm_err("Couldn't allocate HYP init bounce page\n"); | |
1142 | err = -ENOMEM; | |
1143 | goto out; | |
1144 | } | |
1145 | ||
1146 | memcpy(init_bounce_page, __hyp_idmap_text_start, len); | |
1147 | /* | |
1148 | * Warning: the code we just copied to the bounce page | |
1149 | * must be flushed to the point of coherency. | |
1150 | * Otherwise, the data may be sitting in L2, and HYP | |
1151 | * mode won't be able to observe it as it runs with | |
1152 | * caches off at that point. | |
1153 | */ | |
1154 | kvm_flush_dcache_to_poc(init_bounce_page, len); | |
1155 | ||
4fda342c | 1156 | phys_base = kvm_virt_to_phys(init_bounce_page); |
5a677ce0 MZ |
1157 | hyp_idmap_vector += phys_base - hyp_idmap_start; |
1158 | hyp_idmap_start = phys_base; | |
1159 | hyp_idmap_end = phys_base + len; | |
1160 | ||
1161 | kvm_info("Using HYP init bounce page @%lx\n", | |
1162 | (unsigned long)phys_base); | |
1163 | } | |
1164 | ||
38f791a4 CD |
1165 | hyp_pgd = (pgd_t *)__get_free_pages(GFP_KERNEL | __GFP_ZERO, hyp_pgd_order); |
1166 | boot_hyp_pgd = (pgd_t *)__get_free_pages(GFP_KERNEL | __GFP_ZERO, hyp_pgd_order); | |
5d4e08c4 | 1167 | |
5a677ce0 | 1168 | if (!hyp_pgd || !boot_hyp_pgd) { |
d5d8184d | 1169 | kvm_err("Hyp mode PGD not allocated\n"); |
2fb41059 MZ |
1170 | err = -ENOMEM; |
1171 | goto out; | |
1172 | } | |
1173 | ||
1174 | /* Create the idmap in the boot page tables */ | |
1175 | err = __create_hyp_mappings(boot_hyp_pgd, | |
1176 | hyp_idmap_start, hyp_idmap_end, | |
1177 | __phys_to_pfn(hyp_idmap_start), | |
1178 | PAGE_HYP); | |
1179 | ||
1180 | if (err) { | |
1181 | kvm_err("Failed to idmap %lx-%lx\n", | |
1182 | hyp_idmap_start, hyp_idmap_end); | |
1183 | goto out; | |
d5d8184d CD |
1184 | } |
1185 | ||
5a677ce0 MZ |
1186 | /* Map the very same page at the trampoline VA */ |
1187 | err = __create_hyp_mappings(boot_hyp_pgd, | |
1188 | TRAMPOLINE_VA, TRAMPOLINE_VA + PAGE_SIZE, | |
1189 | __phys_to_pfn(hyp_idmap_start), | |
1190 | PAGE_HYP); | |
1191 | if (err) { | |
1192 | kvm_err("Failed to map trampoline @%lx into boot HYP pgd\n", | |
1193 | TRAMPOLINE_VA); | |
1194 | goto out; | |
1195 | } | |
1196 | ||
1197 | /* Map the same page again into the runtime page tables */ | |
1198 | err = __create_hyp_mappings(hyp_pgd, | |
1199 | TRAMPOLINE_VA, TRAMPOLINE_VA + PAGE_SIZE, | |
1200 | __phys_to_pfn(hyp_idmap_start), | |
1201 | PAGE_HYP); | |
1202 | if (err) { | |
1203 | kvm_err("Failed to map trampoline @%lx into runtime HYP pgd\n", | |
1204 | TRAMPOLINE_VA); | |
1205 | goto out; | |
1206 | } | |
1207 | ||
d5d8184d | 1208 | return 0; |
2fb41059 | 1209 | out: |
4f728276 | 1210 | free_hyp_pgds(); |
2fb41059 | 1211 | return err; |
342cd0ab | 1212 | } |
df6ce24f EA |
1213 | |
1214 | void kvm_arch_commit_memory_region(struct kvm *kvm, | |
1215 | struct kvm_userspace_memory_region *mem, | |
1216 | const struct kvm_memory_slot *old, | |
1217 | enum kvm_mr_change change) | |
1218 | { | |
df6ce24f EA |
1219 | } |
1220 | ||
1221 | int kvm_arch_prepare_memory_region(struct kvm *kvm, | |
1222 | struct kvm_memory_slot *memslot, | |
1223 | struct kvm_userspace_memory_region *mem, | |
1224 | enum kvm_mr_change change) | |
1225 | { | |
8eef9123 AB |
1226 | hva_t hva = mem->userspace_addr; |
1227 | hva_t reg_end = hva + mem->memory_size; | |
1228 | bool writable = !(mem->flags & KVM_MEM_READONLY); | |
1229 | int ret = 0; | |
1230 | ||
1231 | if (change != KVM_MR_CREATE && change != KVM_MR_MOVE) | |
1232 | return 0; | |
1233 | ||
c3058d5d CD |
1234 | /* |
1235 | * Prevent userspace from creating a memory region outside of the IPA | |
1236 | * space addressable by the KVM guest IPA space. | |
1237 | */ | |
1238 | if (memslot->base_gfn + memslot->npages >= | |
1239 | (KVM_PHYS_SIZE >> PAGE_SHIFT)) | |
1240 | return -EFAULT; | |
1241 | ||
8eef9123 AB |
1242 | /* |
1243 | * A memory region could potentially cover multiple VMAs, and any holes | |
1244 | * between them, so iterate over all of them to find out if we can map | |
1245 | * any of them right now. | |
1246 | * | |
1247 | * +--------------------------------------------+ | |
1248 | * +---------------+----------------+ +----------------+ | |
1249 | * | : VMA 1 | VMA 2 | | VMA 3 : | | |
1250 | * +---------------+----------------+ +----------------+ | |
1251 | * | memory region | | |
1252 | * +--------------------------------------------+ | |
1253 | */ | |
1254 | do { | |
1255 | struct vm_area_struct *vma = find_vma(current->mm, hva); | |
1256 | hva_t vm_start, vm_end; | |
1257 | ||
1258 | if (!vma || vma->vm_start >= reg_end) | |
1259 | break; | |
1260 | ||
1261 | /* | |
1262 | * Mapping a read-only VMA is only allowed if the | |
1263 | * memory region is configured as read-only. | |
1264 | */ | |
1265 | if (writable && !(vma->vm_flags & VM_WRITE)) { | |
1266 | ret = -EPERM; | |
1267 | break; | |
1268 | } | |
1269 | ||
1270 | /* | |
1271 | * Take the intersection of this VMA with the memory region | |
1272 | */ | |
1273 | vm_start = max(hva, vma->vm_start); | |
1274 | vm_end = min(reg_end, vma->vm_end); | |
1275 | ||
1276 | if (vma->vm_flags & VM_PFNMAP) { | |
1277 | gpa_t gpa = mem->guest_phys_addr + | |
1278 | (vm_start - mem->userspace_addr); | |
1279 | phys_addr_t pa = (vma->vm_pgoff << PAGE_SHIFT) + | |
1280 | vm_start - vma->vm_start; | |
1281 | ||
1282 | ret = kvm_phys_addr_ioremap(kvm, gpa, pa, | |
1283 | vm_end - vm_start, | |
1284 | writable); | |
1285 | if (ret) | |
1286 | break; | |
1287 | } | |
1288 | hva = vm_end; | |
1289 | } while (hva < reg_end); | |
1290 | ||
1291 | if (ret) { | |
1292 | spin_lock(&kvm->mmu_lock); | |
1293 | unmap_stage2_range(kvm, mem->guest_phys_addr, mem->memory_size); | |
1294 | spin_unlock(&kvm->mmu_lock); | |
1295 | } | |
1296 | return ret; | |
df6ce24f EA |
1297 | } |
1298 | ||
1299 | void kvm_arch_free_memslot(struct kvm *kvm, struct kvm_memory_slot *free, | |
1300 | struct kvm_memory_slot *dont) | |
1301 | { | |
1302 | } | |
1303 | ||
1304 | int kvm_arch_create_memslot(struct kvm *kvm, struct kvm_memory_slot *slot, | |
1305 | unsigned long npages) | |
1306 | { | |
1307 | return 0; | |
1308 | } | |
1309 | ||
1310 | void kvm_arch_memslots_updated(struct kvm *kvm) | |
1311 | { | |
1312 | } | |
1313 | ||
1314 | void kvm_arch_flush_shadow_all(struct kvm *kvm) | |
1315 | { | |
1316 | } | |
1317 | ||
1318 | void kvm_arch_flush_shadow_memslot(struct kvm *kvm, | |
1319 | struct kvm_memory_slot *slot) | |
1320 | { | |
8eef9123 AB |
1321 | gpa_t gpa = slot->base_gfn << PAGE_SHIFT; |
1322 | phys_addr_t size = slot->npages << PAGE_SHIFT; | |
1323 | ||
1324 | spin_lock(&kvm->mmu_lock); | |
1325 | unmap_stage2_range(kvm, gpa, size); | |
1326 | spin_unlock(&kvm->mmu_lock); | |
df6ce24f | 1327 | } |