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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)) |
c6473555 | 48 | #define kvm_pud_huge(_x) pud_huge(_x) |
ad361f09 | 49 | |
15a49a44 MS |
50 | #define KVM_S2PTE_FLAG_IS_IOMAP (1UL << 0) |
51 | #define KVM_S2_FLAG_LOGGING_ACTIVE (1UL << 1) | |
52 | ||
53 | static bool memslot_is_logging(struct kvm_memory_slot *memslot) | |
54 | { | |
15a49a44 | 55 | return memslot->dirty_bitmap && !(memslot->flags & KVM_MEM_READONLY); |
7276030a MS |
56 | } |
57 | ||
58 | /** | |
59 | * kvm_flush_remote_tlbs() - flush all VM TLB entries for v7/8 | |
60 | * @kvm: pointer to kvm structure. | |
61 | * | |
62 | * Interface to HYP function to flush all VM TLB entries | |
63 | */ | |
64 | void kvm_flush_remote_tlbs(struct kvm *kvm) | |
65 | { | |
66 | kvm_call_hyp(__kvm_tlb_flush_vmid, kvm); | |
15a49a44 | 67 | } |
ad361f09 | 68 | |
48762767 | 69 | static void kvm_tlb_flush_vmid_ipa(struct kvm *kvm, phys_addr_t ipa) |
d5d8184d | 70 | { |
d4cb9df5 MZ |
71 | /* |
72 | * This function also gets called when dealing with HYP page | |
73 | * tables. As HYP doesn't have an associated struct kvm (and | |
74 | * the HYP page tables are fairly static), we don't do | |
75 | * anything there. | |
76 | */ | |
77 | if (kvm) | |
78 | kvm_call_hyp(__kvm_tlb_flush_vmid_ipa, kvm, ipa); | |
d5d8184d CD |
79 | } |
80 | ||
363ef89f MZ |
81 | /* |
82 | * D-Cache management functions. They take the page table entries by | |
83 | * value, as they are flushing the cache using the kernel mapping (or | |
84 | * kmap on 32bit). | |
85 | */ | |
86 | static void kvm_flush_dcache_pte(pte_t pte) | |
87 | { | |
88 | __kvm_flush_dcache_pte(pte); | |
89 | } | |
90 | ||
91 | static void kvm_flush_dcache_pmd(pmd_t pmd) | |
92 | { | |
93 | __kvm_flush_dcache_pmd(pmd); | |
94 | } | |
95 | ||
96 | static void kvm_flush_dcache_pud(pud_t pud) | |
97 | { | |
98 | __kvm_flush_dcache_pud(pud); | |
99 | } | |
100 | ||
15a49a44 MS |
101 | /** |
102 | * stage2_dissolve_pmd() - clear and flush huge PMD entry | |
103 | * @kvm: pointer to kvm structure. | |
104 | * @addr: IPA | |
105 | * @pmd: pmd pointer for IPA | |
106 | * | |
107 | * Function clears a PMD entry, flushes addr 1st and 2nd stage TLBs. Marks all | |
108 | * pages in the range dirty. | |
109 | */ | |
110 | static void stage2_dissolve_pmd(struct kvm *kvm, phys_addr_t addr, pmd_t *pmd) | |
111 | { | |
112 | if (!kvm_pmd_huge(*pmd)) | |
113 | return; | |
114 | ||
115 | pmd_clear(pmd); | |
116 | kvm_tlb_flush_vmid_ipa(kvm, addr); | |
117 | put_page(virt_to_page(pmd)); | |
118 | } | |
119 | ||
d5d8184d CD |
120 | static int mmu_topup_memory_cache(struct kvm_mmu_memory_cache *cache, |
121 | int min, int max) | |
122 | { | |
123 | void *page; | |
124 | ||
125 | BUG_ON(max > KVM_NR_MEM_OBJS); | |
126 | if (cache->nobjs >= min) | |
127 | return 0; | |
128 | while (cache->nobjs < max) { | |
129 | page = (void *)__get_free_page(PGALLOC_GFP); | |
130 | if (!page) | |
131 | return -ENOMEM; | |
132 | cache->objects[cache->nobjs++] = page; | |
133 | } | |
134 | return 0; | |
135 | } | |
136 | ||
137 | static void mmu_free_memory_cache(struct kvm_mmu_memory_cache *mc) | |
138 | { | |
139 | while (mc->nobjs) | |
140 | free_page((unsigned long)mc->objects[--mc->nobjs]); | |
141 | } | |
142 | ||
143 | static void *mmu_memory_cache_alloc(struct kvm_mmu_memory_cache *mc) | |
144 | { | |
145 | void *p; | |
146 | ||
147 | BUG_ON(!mc || !mc->nobjs); | |
148 | p = mc->objects[--mc->nobjs]; | |
149 | return p; | |
150 | } | |
151 | ||
4f853a71 | 152 | static void clear_pgd_entry(struct kvm *kvm, pgd_t *pgd, phys_addr_t addr) |
979acd5e | 153 | { |
4f853a71 CD |
154 | pud_t *pud_table __maybe_unused = pud_offset(pgd, 0); |
155 | pgd_clear(pgd); | |
156 | kvm_tlb_flush_vmid_ipa(kvm, addr); | |
157 | pud_free(NULL, pud_table); | |
158 | put_page(virt_to_page(pgd)); | |
979acd5e MZ |
159 | } |
160 | ||
d4cb9df5 | 161 | static void clear_pud_entry(struct kvm *kvm, pud_t *pud, phys_addr_t addr) |
342cd0ab | 162 | { |
4f853a71 CD |
163 | pmd_t *pmd_table = pmd_offset(pud, 0); |
164 | VM_BUG_ON(pud_huge(*pud)); | |
165 | pud_clear(pud); | |
166 | kvm_tlb_flush_vmid_ipa(kvm, addr); | |
167 | pmd_free(NULL, pmd_table); | |
4f728276 MZ |
168 | put_page(virt_to_page(pud)); |
169 | } | |
342cd0ab | 170 | |
d4cb9df5 | 171 | static void clear_pmd_entry(struct kvm *kvm, pmd_t *pmd, phys_addr_t addr) |
4f728276 | 172 | { |
4f853a71 CD |
173 | pte_t *pte_table = pte_offset_kernel(pmd, 0); |
174 | VM_BUG_ON(kvm_pmd_huge(*pmd)); | |
175 | pmd_clear(pmd); | |
176 | kvm_tlb_flush_vmid_ipa(kvm, addr); | |
177 | pte_free_kernel(NULL, pte_table); | |
4f728276 MZ |
178 | put_page(virt_to_page(pmd)); |
179 | } | |
180 | ||
363ef89f MZ |
181 | /* |
182 | * Unmapping vs dcache management: | |
183 | * | |
184 | * If a guest maps certain memory pages as uncached, all writes will | |
185 | * bypass the data cache and go directly to RAM. However, the CPUs | |
186 | * can still speculate reads (not writes) and fill cache lines with | |
187 | * data. | |
188 | * | |
189 | * Those cache lines will be *clean* cache lines though, so a | |
190 | * clean+invalidate operation is equivalent to an invalidate | |
191 | * operation, because no cache lines are marked dirty. | |
192 | * | |
193 | * Those clean cache lines could be filled prior to an uncached write | |
194 | * by the guest, and the cache coherent IO subsystem would therefore | |
195 | * end up writing old data to disk. | |
196 | * | |
197 | * This is why right after unmapping a page/section and invalidating | |
198 | * the corresponding TLBs, we call kvm_flush_dcache_p*() to make sure | |
199 | * the IO subsystem will never hit in the cache. | |
200 | */ | |
4f853a71 CD |
201 | static void unmap_ptes(struct kvm *kvm, pmd_t *pmd, |
202 | phys_addr_t addr, phys_addr_t end) | |
4f728276 | 203 | { |
4f853a71 CD |
204 | phys_addr_t start_addr = addr; |
205 | pte_t *pte, *start_pte; | |
206 | ||
207 | start_pte = pte = pte_offset_kernel(pmd, addr); | |
208 | do { | |
209 | if (!pte_none(*pte)) { | |
363ef89f MZ |
210 | pte_t old_pte = *pte; |
211 | ||
4f853a71 | 212 | kvm_set_pte(pte, __pte(0)); |
4f853a71 | 213 | kvm_tlb_flush_vmid_ipa(kvm, addr); |
363ef89f MZ |
214 | |
215 | /* No need to invalidate the cache for device mappings */ | |
216 | if ((pte_val(old_pte) & PAGE_S2_DEVICE) != PAGE_S2_DEVICE) | |
217 | kvm_flush_dcache_pte(old_pte); | |
218 | ||
219 | put_page(virt_to_page(pte)); | |
4f853a71 CD |
220 | } |
221 | } while (pte++, addr += PAGE_SIZE, addr != end); | |
222 | ||
38f791a4 | 223 | if (kvm_pte_table_empty(kvm, start_pte)) |
4f853a71 | 224 | clear_pmd_entry(kvm, pmd, start_addr); |
342cd0ab CD |
225 | } |
226 | ||
4f853a71 CD |
227 | static void unmap_pmds(struct kvm *kvm, pud_t *pud, |
228 | phys_addr_t addr, phys_addr_t end) | |
000d3996 | 229 | { |
4f853a71 CD |
230 | phys_addr_t next, start_addr = addr; |
231 | pmd_t *pmd, *start_pmd; | |
000d3996 | 232 | |
4f853a71 CD |
233 | start_pmd = pmd = pmd_offset(pud, addr); |
234 | do { | |
235 | next = kvm_pmd_addr_end(addr, end); | |
236 | if (!pmd_none(*pmd)) { | |
237 | if (kvm_pmd_huge(*pmd)) { | |
363ef89f MZ |
238 | pmd_t old_pmd = *pmd; |
239 | ||
4f853a71 CD |
240 | pmd_clear(pmd); |
241 | kvm_tlb_flush_vmid_ipa(kvm, addr); | |
363ef89f MZ |
242 | |
243 | kvm_flush_dcache_pmd(old_pmd); | |
244 | ||
4f853a71 CD |
245 | put_page(virt_to_page(pmd)); |
246 | } else { | |
247 | unmap_ptes(kvm, pmd, addr, next); | |
248 | } | |
ad361f09 | 249 | } |
4f853a71 | 250 | } while (pmd++, addr = next, addr != end); |
ad361f09 | 251 | |
38f791a4 | 252 | if (kvm_pmd_table_empty(kvm, start_pmd)) |
4f853a71 CD |
253 | clear_pud_entry(kvm, pud, start_addr); |
254 | } | |
000d3996 | 255 | |
4f853a71 CD |
256 | static void unmap_puds(struct kvm *kvm, pgd_t *pgd, |
257 | phys_addr_t addr, phys_addr_t end) | |
258 | { | |
259 | phys_addr_t next, start_addr = addr; | |
260 | pud_t *pud, *start_pud; | |
4f728276 | 261 | |
4f853a71 CD |
262 | start_pud = pud = pud_offset(pgd, addr); |
263 | do { | |
264 | next = kvm_pud_addr_end(addr, end); | |
265 | if (!pud_none(*pud)) { | |
266 | if (pud_huge(*pud)) { | |
363ef89f MZ |
267 | pud_t old_pud = *pud; |
268 | ||
4f853a71 CD |
269 | pud_clear(pud); |
270 | kvm_tlb_flush_vmid_ipa(kvm, addr); | |
363ef89f MZ |
271 | |
272 | kvm_flush_dcache_pud(old_pud); | |
273 | ||
4f853a71 CD |
274 | put_page(virt_to_page(pud)); |
275 | } else { | |
276 | unmap_pmds(kvm, pud, addr, next); | |
4f728276 MZ |
277 | } |
278 | } | |
4f853a71 | 279 | } while (pud++, addr = next, addr != end); |
4f728276 | 280 | |
38f791a4 | 281 | if (kvm_pud_table_empty(kvm, start_pud)) |
4f853a71 CD |
282 | clear_pgd_entry(kvm, pgd, start_addr); |
283 | } | |
284 | ||
285 | ||
286 | static void unmap_range(struct kvm *kvm, pgd_t *pgdp, | |
287 | phys_addr_t start, u64 size) | |
288 | { | |
289 | pgd_t *pgd; | |
290 | phys_addr_t addr = start, end = start + size; | |
291 | phys_addr_t next; | |
292 | ||
293 | pgd = pgdp + pgd_index(addr); | |
294 | do { | |
295 | next = kvm_pgd_addr_end(addr, end); | |
7cbb87d6 MR |
296 | if (!pgd_none(*pgd)) |
297 | unmap_puds(kvm, pgd, addr, next); | |
4f853a71 | 298 | } while (pgd++, addr = next, addr != end); |
000d3996 MZ |
299 | } |
300 | ||
9d218a1f MZ |
301 | static void stage2_flush_ptes(struct kvm *kvm, pmd_t *pmd, |
302 | phys_addr_t addr, phys_addr_t end) | |
303 | { | |
304 | pte_t *pte; | |
305 | ||
306 | pte = pte_offset_kernel(pmd, addr); | |
307 | do { | |
363ef89f MZ |
308 | if (!pte_none(*pte) && |
309 | (pte_val(*pte) & PAGE_S2_DEVICE) != PAGE_S2_DEVICE) | |
310 | kvm_flush_dcache_pte(*pte); | |
9d218a1f MZ |
311 | } while (pte++, addr += PAGE_SIZE, addr != end); |
312 | } | |
313 | ||
314 | static void stage2_flush_pmds(struct kvm *kvm, pud_t *pud, | |
315 | phys_addr_t addr, phys_addr_t end) | |
316 | { | |
317 | pmd_t *pmd; | |
318 | phys_addr_t next; | |
319 | ||
320 | pmd = pmd_offset(pud, addr); | |
321 | do { | |
322 | next = kvm_pmd_addr_end(addr, end); | |
323 | if (!pmd_none(*pmd)) { | |
363ef89f MZ |
324 | if (kvm_pmd_huge(*pmd)) |
325 | kvm_flush_dcache_pmd(*pmd); | |
326 | else | |
9d218a1f | 327 | stage2_flush_ptes(kvm, pmd, addr, next); |
9d218a1f MZ |
328 | } |
329 | } while (pmd++, addr = next, addr != end); | |
330 | } | |
331 | ||
332 | static void stage2_flush_puds(struct kvm *kvm, pgd_t *pgd, | |
333 | phys_addr_t addr, phys_addr_t end) | |
334 | { | |
335 | pud_t *pud; | |
336 | phys_addr_t next; | |
337 | ||
338 | pud = pud_offset(pgd, addr); | |
339 | do { | |
340 | next = kvm_pud_addr_end(addr, end); | |
341 | if (!pud_none(*pud)) { | |
363ef89f MZ |
342 | if (pud_huge(*pud)) |
343 | kvm_flush_dcache_pud(*pud); | |
344 | else | |
9d218a1f | 345 | stage2_flush_pmds(kvm, pud, addr, next); |
9d218a1f MZ |
346 | } |
347 | } while (pud++, addr = next, addr != end); | |
348 | } | |
349 | ||
350 | static void stage2_flush_memslot(struct kvm *kvm, | |
351 | struct kvm_memory_slot *memslot) | |
352 | { | |
353 | phys_addr_t addr = memslot->base_gfn << PAGE_SHIFT; | |
354 | phys_addr_t end = addr + PAGE_SIZE * memslot->npages; | |
355 | phys_addr_t next; | |
356 | pgd_t *pgd; | |
357 | ||
358 | pgd = kvm->arch.pgd + pgd_index(addr); | |
359 | do { | |
360 | next = kvm_pgd_addr_end(addr, end); | |
361 | stage2_flush_puds(kvm, pgd, addr, next); | |
362 | } while (pgd++, addr = next, addr != end); | |
363 | } | |
364 | ||
365 | /** | |
366 | * stage2_flush_vm - Invalidate cache for pages mapped in stage 2 | |
367 | * @kvm: The struct kvm pointer | |
368 | * | |
369 | * Go through the stage 2 page tables and invalidate any cache lines | |
370 | * backing memory already mapped to the VM. | |
371 | */ | |
3c1e7165 | 372 | static void stage2_flush_vm(struct kvm *kvm) |
9d218a1f MZ |
373 | { |
374 | struct kvm_memslots *slots; | |
375 | struct kvm_memory_slot *memslot; | |
376 | int idx; | |
377 | ||
378 | idx = srcu_read_lock(&kvm->srcu); | |
379 | spin_lock(&kvm->mmu_lock); | |
380 | ||
381 | slots = kvm_memslots(kvm); | |
382 | kvm_for_each_memslot(memslot, slots) | |
383 | stage2_flush_memslot(kvm, memslot); | |
384 | ||
385 | spin_unlock(&kvm->mmu_lock); | |
386 | srcu_read_unlock(&kvm->srcu, idx); | |
387 | } | |
388 | ||
d157f4a5 MZ |
389 | /** |
390 | * free_boot_hyp_pgd - free HYP boot page tables | |
391 | * | |
392 | * Free the HYP boot page tables. The bounce page is also freed. | |
393 | */ | |
394 | void free_boot_hyp_pgd(void) | |
395 | { | |
396 | mutex_lock(&kvm_hyp_pgd_mutex); | |
397 | ||
398 | if (boot_hyp_pgd) { | |
d4cb9df5 MZ |
399 | unmap_range(NULL, boot_hyp_pgd, hyp_idmap_start, PAGE_SIZE); |
400 | unmap_range(NULL, boot_hyp_pgd, TRAMPOLINE_VA, PAGE_SIZE); | |
38f791a4 | 401 | free_pages((unsigned long)boot_hyp_pgd, hyp_pgd_order); |
d157f4a5 MZ |
402 | boot_hyp_pgd = NULL; |
403 | } | |
404 | ||
405 | if (hyp_pgd) | |
d4cb9df5 | 406 | unmap_range(NULL, hyp_pgd, TRAMPOLINE_VA, PAGE_SIZE); |
d157f4a5 | 407 | |
5d4e08c4 | 408 | free_page((unsigned long)init_bounce_page); |
d157f4a5 MZ |
409 | init_bounce_page = NULL; |
410 | ||
411 | mutex_unlock(&kvm_hyp_pgd_mutex); | |
412 | } | |
413 | ||
342cd0ab | 414 | /** |
4f728276 | 415 | * free_hyp_pgds - free Hyp-mode page tables |
342cd0ab | 416 | * |
5a677ce0 MZ |
417 | * Assumes hyp_pgd is a page table used strictly in Hyp-mode and |
418 | * therefore contains either mappings in the kernel memory area (above | |
419 | * PAGE_OFFSET), or device mappings in the vmalloc range (from | |
420 | * VMALLOC_START to VMALLOC_END). | |
421 | * | |
422 | * boot_hyp_pgd should only map two pages for the init code. | |
342cd0ab | 423 | */ |
4f728276 | 424 | void free_hyp_pgds(void) |
342cd0ab | 425 | { |
342cd0ab CD |
426 | unsigned long addr; |
427 | ||
d157f4a5 | 428 | free_boot_hyp_pgd(); |
4f728276 | 429 | |
d157f4a5 | 430 | mutex_lock(&kvm_hyp_pgd_mutex); |
5a677ce0 | 431 | |
4f728276 MZ |
432 | if (hyp_pgd) { |
433 | for (addr = PAGE_OFFSET; virt_addr_valid(addr); addr += PGDIR_SIZE) | |
d4cb9df5 | 434 | unmap_range(NULL, hyp_pgd, KERN_TO_HYP(addr), PGDIR_SIZE); |
4f728276 | 435 | for (addr = VMALLOC_START; is_vmalloc_addr((void*)addr); addr += PGDIR_SIZE) |
d4cb9df5 MZ |
436 | unmap_range(NULL, hyp_pgd, KERN_TO_HYP(addr), PGDIR_SIZE); |
437 | ||
38f791a4 | 438 | free_pages((unsigned long)hyp_pgd, hyp_pgd_order); |
d157f4a5 | 439 | hyp_pgd = NULL; |
4f728276 MZ |
440 | } |
441 | ||
342cd0ab CD |
442 | mutex_unlock(&kvm_hyp_pgd_mutex); |
443 | } | |
444 | ||
445 | static void create_hyp_pte_mappings(pmd_t *pmd, unsigned long start, | |
6060df84 MZ |
446 | unsigned long end, unsigned long pfn, |
447 | pgprot_t prot) | |
342cd0ab CD |
448 | { |
449 | pte_t *pte; | |
450 | unsigned long addr; | |
342cd0ab | 451 | |
3562c76d MZ |
452 | addr = start; |
453 | do { | |
6060df84 MZ |
454 | pte = pte_offset_kernel(pmd, addr); |
455 | kvm_set_pte(pte, pfn_pte(pfn, prot)); | |
4f728276 | 456 | get_page(virt_to_page(pte)); |
5a677ce0 | 457 | kvm_flush_dcache_to_poc(pte, sizeof(*pte)); |
6060df84 | 458 | pfn++; |
3562c76d | 459 | } while (addr += PAGE_SIZE, addr != end); |
342cd0ab CD |
460 | } |
461 | ||
462 | static int create_hyp_pmd_mappings(pud_t *pud, unsigned long start, | |
6060df84 MZ |
463 | unsigned long end, unsigned long pfn, |
464 | pgprot_t prot) | |
342cd0ab CD |
465 | { |
466 | pmd_t *pmd; | |
467 | pte_t *pte; | |
468 | unsigned long addr, next; | |
469 | ||
3562c76d MZ |
470 | addr = start; |
471 | do { | |
6060df84 | 472 | pmd = pmd_offset(pud, addr); |
342cd0ab CD |
473 | |
474 | BUG_ON(pmd_sect(*pmd)); | |
475 | ||
476 | if (pmd_none(*pmd)) { | |
6060df84 | 477 | pte = pte_alloc_one_kernel(NULL, addr); |
342cd0ab CD |
478 | if (!pte) { |
479 | kvm_err("Cannot allocate Hyp pte\n"); | |
480 | return -ENOMEM; | |
481 | } | |
482 | pmd_populate_kernel(NULL, pmd, pte); | |
4f728276 | 483 | get_page(virt_to_page(pmd)); |
5a677ce0 | 484 | kvm_flush_dcache_to_poc(pmd, sizeof(*pmd)); |
342cd0ab CD |
485 | } |
486 | ||
487 | next = pmd_addr_end(addr, end); | |
488 | ||
6060df84 MZ |
489 | create_hyp_pte_mappings(pmd, addr, next, pfn, prot); |
490 | pfn += (next - addr) >> PAGE_SHIFT; | |
3562c76d | 491 | } while (addr = next, addr != end); |
342cd0ab CD |
492 | |
493 | return 0; | |
494 | } | |
495 | ||
38f791a4 CD |
496 | static int create_hyp_pud_mappings(pgd_t *pgd, unsigned long start, |
497 | unsigned long end, unsigned long pfn, | |
498 | pgprot_t prot) | |
499 | { | |
500 | pud_t *pud; | |
501 | pmd_t *pmd; | |
502 | unsigned long addr, next; | |
503 | int ret; | |
504 | ||
505 | addr = start; | |
506 | do { | |
507 | pud = pud_offset(pgd, addr); | |
508 | ||
509 | if (pud_none_or_clear_bad(pud)) { | |
510 | pmd = pmd_alloc_one(NULL, addr); | |
511 | if (!pmd) { | |
512 | kvm_err("Cannot allocate Hyp pmd\n"); | |
513 | return -ENOMEM; | |
514 | } | |
515 | pud_populate(NULL, pud, pmd); | |
516 | get_page(virt_to_page(pud)); | |
517 | kvm_flush_dcache_to_poc(pud, sizeof(*pud)); | |
518 | } | |
519 | ||
520 | next = pud_addr_end(addr, end); | |
521 | ret = create_hyp_pmd_mappings(pud, addr, next, pfn, prot); | |
522 | if (ret) | |
523 | return ret; | |
524 | pfn += (next - addr) >> PAGE_SHIFT; | |
525 | } while (addr = next, addr != end); | |
526 | ||
527 | return 0; | |
528 | } | |
529 | ||
6060df84 MZ |
530 | static int __create_hyp_mappings(pgd_t *pgdp, |
531 | unsigned long start, unsigned long end, | |
532 | unsigned long pfn, pgprot_t prot) | |
342cd0ab | 533 | { |
342cd0ab CD |
534 | pgd_t *pgd; |
535 | pud_t *pud; | |
342cd0ab CD |
536 | unsigned long addr, next; |
537 | int err = 0; | |
538 | ||
342cd0ab | 539 | mutex_lock(&kvm_hyp_pgd_mutex); |
3562c76d MZ |
540 | addr = start & PAGE_MASK; |
541 | end = PAGE_ALIGN(end); | |
542 | do { | |
6060df84 | 543 | pgd = pgdp + pgd_index(addr); |
342cd0ab | 544 | |
38f791a4 CD |
545 | if (pgd_none(*pgd)) { |
546 | pud = pud_alloc_one(NULL, addr); | |
547 | if (!pud) { | |
548 | kvm_err("Cannot allocate Hyp pud\n"); | |
342cd0ab CD |
549 | err = -ENOMEM; |
550 | goto out; | |
551 | } | |
38f791a4 CD |
552 | pgd_populate(NULL, pgd, pud); |
553 | get_page(virt_to_page(pgd)); | |
554 | kvm_flush_dcache_to_poc(pgd, sizeof(*pgd)); | |
342cd0ab CD |
555 | } |
556 | ||
557 | next = pgd_addr_end(addr, end); | |
38f791a4 | 558 | err = create_hyp_pud_mappings(pgd, addr, next, pfn, prot); |
342cd0ab CD |
559 | if (err) |
560 | goto out; | |
6060df84 | 561 | pfn += (next - addr) >> PAGE_SHIFT; |
3562c76d | 562 | } while (addr = next, addr != end); |
342cd0ab CD |
563 | out: |
564 | mutex_unlock(&kvm_hyp_pgd_mutex); | |
565 | return err; | |
566 | } | |
567 | ||
40c2729b CD |
568 | static phys_addr_t kvm_kaddr_to_phys(void *kaddr) |
569 | { | |
570 | if (!is_vmalloc_addr(kaddr)) { | |
571 | BUG_ON(!virt_addr_valid(kaddr)); | |
572 | return __pa(kaddr); | |
573 | } else { | |
574 | return page_to_phys(vmalloc_to_page(kaddr)) + | |
575 | offset_in_page(kaddr); | |
576 | } | |
577 | } | |
578 | ||
342cd0ab | 579 | /** |
06e8c3b0 | 580 | * create_hyp_mappings - duplicate a kernel virtual address range in Hyp mode |
342cd0ab CD |
581 | * @from: The virtual kernel start address of the range |
582 | * @to: The virtual kernel end address of the range (exclusive) | |
583 | * | |
06e8c3b0 MZ |
584 | * The same virtual address as the kernel virtual address is also used |
585 | * in Hyp-mode mapping (modulo HYP_PAGE_OFFSET) to the same underlying | |
586 | * physical pages. | |
342cd0ab CD |
587 | */ |
588 | int create_hyp_mappings(void *from, void *to) | |
589 | { | |
40c2729b CD |
590 | phys_addr_t phys_addr; |
591 | unsigned long virt_addr; | |
6060df84 MZ |
592 | unsigned long start = KERN_TO_HYP((unsigned long)from); |
593 | unsigned long end = KERN_TO_HYP((unsigned long)to); | |
594 | ||
40c2729b CD |
595 | start = start & PAGE_MASK; |
596 | end = PAGE_ALIGN(end); | |
6060df84 | 597 | |
40c2729b CD |
598 | for (virt_addr = start; virt_addr < end; virt_addr += PAGE_SIZE) { |
599 | int err; | |
6060df84 | 600 | |
40c2729b CD |
601 | phys_addr = kvm_kaddr_to_phys(from + virt_addr - start); |
602 | err = __create_hyp_mappings(hyp_pgd, virt_addr, | |
603 | virt_addr + PAGE_SIZE, | |
604 | __phys_to_pfn(phys_addr), | |
605 | PAGE_HYP); | |
606 | if (err) | |
607 | return err; | |
608 | } | |
609 | ||
610 | return 0; | |
342cd0ab CD |
611 | } |
612 | ||
613 | /** | |
06e8c3b0 MZ |
614 | * create_hyp_io_mappings - duplicate a kernel IO mapping into Hyp mode |
615 | * @from: The kernel start VA of the range | |
616 | * @to: The kernel end VA of the range (exclusive) | |
6060df84 | 617 | * @phys_addr: The physical start address which gets mapped |
06e8c3b0 MZ |
618 | * |
619 | * The resulting HYP VA is the same as the kernel VA, modulo | |
620 | * HYP_PAGE_OFFSET. | |
342cd0ab | 621 | */ |
6060df84 | 622 | int create_hyp_io_mappings(void *from, void *to, phys_addr_t phys_addr) |
342cd0ab | 623 | { |
6060df84 MZ |
624 | unsigned long start = KERN_TO_HYP((unsigned long)from); |
625 | unsigned long end = KERN_TO_HYP((unsigned long)to); | |
626 | ||
627 | /* Check for a valid kernel IO mapping */ | |
628 | if (!is_vmalloc_addr(from) || !is_vmalloc_addr(to - 1)) | |
629 | return -EINVAL; | |
630 | ||
631 | return __create_hyp_mappings(hyp_pgd, start, end, | |
632 | __phys_to_pfn(phys_addr), PAGE_HYP_DEVICE); | |
342cd0ab CD |
633 | } |
634 | ||
d5d8184d CD |
635 | /** |
636 | * kvm_alloc_stage2_pgd - allocate level-1 table for stage-2 translation. | |
637 | * @kvm: The KVM struct pointer for the VM. | |
638 | * | |
639 | * Allocates the 1st level table only of size defined by S2_PGD_ORDER (can | |
640 | * support either full 40-bit input addresses or limited to 32-bit input | |
641 | * addresses). Clears the allocated pages. | |
642 | * | |
643 | * Note we don't need locking here as this is only called when the VM is | |
644 | * created, which can only be done once. | |
645 | */ | |
646 | int kvm_alloc_stage2_pgd(struct kvm *kvm) | |
647 | { | |
38f791a4 | 648 | int ret; |
d5d8184d CD |
649 | pgd_t *pgd; |
650 | ||
651 | if (kvm->arch.pgd != NULL) { | |
652 | kvm_err("kvm_arch already initialized?\n"); | |
653 | return -EINVAL; | |
654 | } | |
655 | ||
38f791a4 CD |
656 | if (KVM_PREALLOC_LEVEL > 0) { |
657 | /* | |
658 | * Allocate fake pgd for the page table manipulation macros to | |
659 | * work. This is not used by the hardware and we have no | |
660 | * alignment requirement for this allocation. | |
661 | */ | |
662 | pgd = (pgd_t *)kmalloc(PTRS_PER_S2_PGD * sizeof(pgd_t), | |
663 | GFP_KERNEL | __GFP_ZERO); | |
664 | } else { | |
665 | /* | |
666 | * Allocate actual first-level Stage-2 page table used by the | |
667 | * hardware for Stage-2 page table walks. | |
668 | */ | |
669 | pgd = (pgd_t *)__get_free_pages(GFP_KERNEL | __GFP_ZERO, S2_PGD_ORDER); | |
670 | } | |
671 | ||
d5d8184d CD |
672 | if (!pgd) |
673 | return -ENOMEM; | |
674 | ||
38f791a4 CD |
675 | ret = kvm_prealloc_hwpgd(kvm, pgd); |
676 | if (ret) | |
677 | goto out_err; | |
678 | ||
c62ee2b2 | 679 | kvm_clean_pgd(pgd); |
d5d8184d | 680 | kvm->arch.pgd = pgd; |
d5d8184d | 681 | return 0; |
38f791a4 CD |
682 | out_err: |
683 | if (KVM_PREALLOC_LEVEL > 0) | |
684 | kfree(pgd); | |
685 | else | |
686 | free_pages((unsigned long)pgd, S2_PGD_ORDER); | |
687 | return ret; | |
d5d8184d CD |
688 | } |
689 | ||
d5d8184d CD |
690 | /** |
691 | * unmap_stage2_range -- Clear stage2 page table entries to unmap a range | |
692 | * @kvm: The VM pointer | |
693 | * @start: The intermediate physical base address of the range to unmap | |
694 | * @size: The size of the area to unmap | |
695 | * | |
696 | * Clear a range of stage-2 mappings, lowering the various ref-counts. Must | |
697 | * be called while holding mmu_lock (unless for freeing the stage2 pgd before | |
698 | * destroying the VM), otherwise another faulting VCPU may come in and mess | |
699 | * with things behind our backs. | |
700 | */ | |
701 | static void unmap_stage2_range(struct kvm *kvm, phys_addr_t start, u64 size) | |
702 | { | |
d4cb9df5 | 703 | unmap_range(kvm, kvm->arch.pgd, start, size); |
d5d8184d CD |
704 | } |
705 | ||
957db105 CD |
706 | static void stage2_unmap_memslot(struct kvm *kvm, |
707 | struct kvm_memory_slot *memslot) | |
708 | { | |
709 | hva_t hva = memslot->userspace_addr; | |
710 | phys_addr_t addr = memslot->base_gfn << PAGE_SHIFT; | |
711 | phys_addr_t size = PAGE_SIZE * memslot->npages; | |
712 | hva_t reg_end = hva + size; | |
713 | ||
714 | /* | |
715 | * A memory region could potentially cover multiple VMAs, and any holes | |
716 | * between them, so iterate over all of them to find out if we should | |
717 | * unmap any of them. | |
718 | * | |
719 | * +--------------------------------------------+ | |
720 | * +---------------+----------------+ +----------------+ | |
721 | * | : VMA 1 | VMA 2 | | VMA 3 : | | |
722 | * +---------------+----------------+ +----------------+ | |
723 | * | memory region | | |
724 | * +--------------------------------------------+ | |
725 | */ | |
726 | do { | |
727 | struct vm_area_struct *vma = find_vma(current->mm, hva); | |
728 | hva_t vm_start, vm_end; | |
729 | ||
730 | if (!vma || vma->vm_start >= reg_end) | |
731 | break; | |
732 | ||
733 | /* | |
734 | * Take the intersection of this VMA with the memory region | |
735 | */ | |
736 | vm_start = max(hva, vma->vm_start); | |
737 | vm_end = min(reg_end, vma->vm_end); | |
738 | ||
739 | if (!(vma->vm_flags & VM_PFNMAP)) { | |
740 | gpa_t gpa = addr + (vm_start - memslot->userspace_addr); | |
741 | unmap_stage2_range(kvm, gpa, vm_end - vm_start); | |
742 | } | |
743 | hva = vm_end; | |
744 | } while (hva < reg_end); | |
745 | } | |
746 | ||
747 | /** | |
748 | * stage2_unmap_vm - Unmap Stage-2 RAM mappings | |
749 | * @kvm: The struct kvm pointer | |
750 | * | |
751 | * Go through the memregions and unmap any reguler RAM | |
752 | * backing memory already mapped to the VM. | |
753 | */ | |
754 | void stage2_unmap_vm(struct kvm *kvm) | |
755 | { | |
756 | struct kvm_memslots *slots; | |
757 | struct kvm_memory_slot *memslot; | |
758 | int idx; | |
759 | ||
760 | idx = srcu_read_lock(&kvm->srcu); | |
761 | spin_lock(&kvm->mmu_lock); | |
762 | ||
763 | slots = kvm_memslots(kvm); | |
764 | kvm_for_each_memslot(memslot, slots) | |
765 | stage2_unmap_memslot(kvm, memslot); | |
766 | ||
767 | spin_unlock(&kvm->mmu_lock); | |
768 | srcu_read_unlock(&kvm->srcu, idx); | |
769 | } | |
770 | ||
d5d8184d CD |
771 | /** |
772 | * kvm_free_stage2_pgd - free all stage-2 tables | |
773 | * @kvm: The KVM struct pointer for the VM. | |
774 | * | |
775 | * Walks the level-1 page table pointed to by kvm->arch.pgd and frees all | |
776 | * underlying level-2 and level-3 tables before freeing the actual level-1 table | |
777 | * and setting the struct pointer to NULL. | |
778 | * | |
779 | * Note we don't need locking here as this is only called when the VM is | |
780 | * destroyed, which can only be done once. | |
781 | */ | |
782 | void kvm_free_stage2_pgd(struct kvm *kvm) | |
783 | { | |
784 | if (kvm->arch.pgd == NULL) | |
785 | return; | |
786 | ||
787 | unmap_stage2_range(kvm, 0, KVM_PHYS_SIZE); | |
38f791a4 CD |
788 | kvm_free_hwpgd(kvm); |
789 | if (KVM_PREALLOC_LEVEL > 0) | |
790 | kfree(kvm->arch.pgd); | |
791 | else | |
792 | free_pages((unsigned long)kvm->arch.pgd, S2_PGD_ORDER); | |
d5d8184d CD |
793 | kvm->arch.pgd = NULL; |
794 | } | |
795 | ||
38f791a4 | 796 | static pud_t *stage2_get_pud(struct kvm *kvm, struct kvm_mmu_memory_cache *cache, |
ad361f09 | 797 | phys_addr_t addr) |
d5d8184d CD |
798 | { |
799 | pgd_t *pgd; | |
800 | pud_t *pud; | |
d5d8184d | 801 | |
d5d8184d | 802 | pgd = kvm->arch.pgd + pgd_index(addr); |
38f791a4 CD |
803 | if (WARN_ON(pgd_none(*pgd))) { |
804 | if (!cache) | |
805 | return NULL; | |
806 | pud = mmu_memory_cache_alloc(cache); | |
807 | pgd_populate(NULL, pgd, pud); | |
808 | get_page(virt_to_page(pgd)); | |
809 | } | |
810 | ||
811 | return pud_offset(pgd, addr); | |
812 | } | |
813 | ||
814 | static pmd_t *stage2_get_pmd(struct kvm *kvm, struct kvm_mmu_memory_cache *cache, | |
815 | phys_addr_t addr) | |
816 | { | |
817 | pud_t *pud; | |
818 | pmd_t *pmd; | |
819 | ||
820 | pud = stage2_get_pud(kvm, cache, addr); | |
d5d8184d CD |
821 | if (pud_none(*pud)) { |
822 | if (!cache) | |
ad361f09 | 823 | return NULL; |
d5d8184d CD |
824 | pmd = mmu_memory_cache_alloc(cache); |
825 | pud_populate(NULL, pud, pmd); | |
d5d8184d | 826 | get_page(virt_to_page(pud)); |
c62ee2b2 MZ |
827 | } |
828 | ||
ad361f09 CD |
829 | return pmd_offset(pud, addr); |
830 | } | |
831 | ||
832 | static int stage2_set_pmd_huge(struct kvm *kvm, struct kvm_mmu_memory_cache | |
833 | *cache, phys_addr_t addr, const pmd_t *new_pmd) | |
834 | { | |
835 | pmd_t *pmd, old_pmd; | |
836 | ||
837 | pmd = stage2_get_pmd(kvm, cache, addr); | |
838 | VM_BUG_ON(!pmd); | |
d5d8184d | 839 | |
ad361f09 CD |
840 | /* |
841 | * Mapping in huge pages should only happen through a fault. If a | |
842 | * page is merged into a transparent huge page, the individual | |
843 | * subpages of that huge page should be unmapped through MMU | |
844 | * notifiers before we get here. | |
845 | * | |
846 | * Merging of CompoundPages is not supported; they should become | |
847 | * splitting first, unmapped, merged, and mapped back in on-demand. | |
848 | */ | |
849 | VM_BUG_ON(pmd_present(*pmd) && pmd_pfn(*pmd) != pmd_pfn(*new_pmd)); | |
850 | ||
851 | old_pmd = *pmd; | |
852 | kvm_set_pmd(pmd, *new_pmd); | |
853 | if (pmd_present(old_pmd)) | |
854 | kvm_tlb_flush_vmid_ipa(kvm, addr); | |
855 | else | |
856 | get_page(virt_to_page(pmd)); | |
857 | return 0; | |
858 | } | |
859 | ||
860 | static int stage2_set_pte(struct kvm *kvm, struct kvm_mmu_memory_cache *cache, | |
15a49a44 MS |
861 | phys_addr_t addr, const pte_t *new_pte, |
862 | unsigned long flags) | |
ad361f09 CD |
863 | { |
864 | pmd_t *pmd; | |
865 | pte_t *pte, old_pte; | |
15a49a44 MS |
866 | bool iomap = flags & KVM_S2PTE_FLAG_IS_IOMAP; |
867 | bool logging_active = flags & KVM_S2_FLAG_LOGGING_ACTIVE; | |
868 | ||
869 | VM_BUG_ON(logging_active && !cache); | |
ad361f09 | 870 | |
38f791a4 | 871 | /* Create stage-2 page table mapping - Levels 0 and 1 */ |
ad361f09 CD |
872 | pmd = stage2_get_pmd(kvm, cache, addr); |
873 | if (!pmd) { | |
874 | /* | |
875 | * Ignore calls from kvm_set_spte_hva for unallocated | |
876 | * address ranges. | |
877 | */ | |
878 | return 0; | |
879 | } | |
880 | ||
15a49a44 MS |
881 | /* |
882 | * While dirty page logging - dissolve huge PMD, then continue on to | |
883 | * allocate page. | |
884 | */ | |
885 | if (logging_active) | |
886 | stage2_dissolve_pmd(kvm, addr, pmd); | |
887 | ||
ad361f09 | 888 | /* Create stage-2 page mappings - Level 2 */ |
d5d8184d CD |
889 | if (pmd_none(*pmd)) { |
890 | if (!cache) | |
891 | return 0; /* ignore calls from kvm_set_spte_hva */ | |
892 | pte = mmu_memory_cache_alloc(cache); | |
c62ee2b2 | 893 | kvm_clean_pte(pte); |
d5d8184d | 894 | pmd_populate_kernel(NULL, pmd, pte); |
d5d8184d | 895 | get_page(virt_to_page(pmd)); |
c62ee2b2 MZ |
896 | } |
897 | ||
898 | pte = pte_offset_kernel(pmd, addr); | |
d5d8184d CD |
899 | |
900 | if (iomap && pte_present(*pte)) | |
901 | return -EFAULT; | |
902 | ||
903 | /* Create 2nd stage page table mapping - Level 3 */ | |
904 | old_pte = *pte; | |
905 | kvm_set_pte(pte, *new_pte); | |
906 | if (pte_present(old_pte)) | |
48762767 | 907 | kvm_tlb_flush_vmid_ipa(kvm, addr); |
d5d8184d CD |
908 | else |
909 | get_page(virt_to_page(pte)); | |
910 | ||
911 | return 0; | |
912 | } | |
913 | ||
914 | /** | |
915 | * kvm_phys_addr_ioremap - map a device range to guest IPA | |
916 | * | |
917 | * @kvm: The KVM pointer | |
918 | * @guest_ipa: The IPA at which to insert the mapping | |
919 | * @pa: The physical address of the device | |
920 | * @size: The size of the mapping | |
921 | */ | |
922 | int kvm_phys_addr_ioremap(struct kvm *kvm, phys_addr_t guest_ipa, | |
c40f2f8f | 923 | phys_addr_t pa, unsigned long size, bool writable) |
d5d8184d CD |
924 | { |
925 | phys_addr_t addr, end; | |
926 | int ret = 0; | |
927 | unsigned long pfn; | |
928 | struct kvm_mmu_memory_cache cache = { 0, }; | |
929 | ||
930 | end = (guest_ipa + size + PAGE_SIZE - 1) & PAGE_MASK; | |
931 | pfn = __phys_to_pfn(pa); | |
932 | ||
933 | for (addr = guest_ipa; addr < end; addr += PAGE_SIZE) { | |
c62ee2b2 | 934 | pte_t pte = pfn_pte(pfn, PAGE_S2_DEVICE); |
d5d8184d | 935 | |
c40f2f8f AB |
936 | if (writable) |
937 | kvm_set_s2pte_writable(&pte); | |
938 | ||
38f791a4 CD |
939 | ret = mmu_topup_memory_cache(&cache, KVM_MMU_CACHE_MIN_PAGES, |
940 | KVM_NR_MEM_OBJS); | |
d5d8184d CD |
941 | if (ret) |
942 | goto out; | |
943 | spin_lock(&kvm->mmu_lock); | |
15a49a44 MS |
944 | ret = stage2_set_pte(kvm, &cache, addr, &pte, |
945 | KVM_S2PTE_FLAG_IS_IOMAP); | |
d5d8184d CD |
946 | spin_unlock(&kvm->mmu_lock); |
947 | if (ret) | |
948 | goto out; | |
949 | ||
950 | pfn++; | |
951 | } | |
952 | ||
953 | out: | |
954 | mmu_free_memory_cache(&cache); | |
955 | return ret; | |
956 | } | |
957 | ||
9b5fdb97 CD |
958 | static bool transparent_hugepage_adjust(pfn_t *pfnp, phys_addr_t *ipap) |
959 | { | |
960 | pfn_t pfn = *pfnp; | |
961 | gfn_t gfn = *ipap >> PAGE_SHIFT; | |
962 | ||
963 | if (PageTransCompound(pfn_to_page(pfn))) { | |
964 | unsigned long mask; | |
965 | /* | |
966 | * The address we faulted on is backed by a transparent huge | |
967 | * page. However, because we map the compound huge page and | |
968 | * not the individual tail page, we need to transfer the | |
969 | * refcount to the head page. We have to be careful that the | |
970 | * THP doesn't start to split while we are adjusting the | |
971 | * refcounts. | |
972 | * | |
973 | * We are sure this doesn't happen, because mmu_notifier_retry | |
974 | * was successful and we are holding the mmu_lock, so if this | |
975 | * THP is trying to split, it will be blocked in the mmu | |
976 | * notifier before touching any of the pages, specifically | |
977 | * before being able to call __split_huge_page_refcount(). | |
978 | * | |
979 | * We can therefore safely transfer the refcount from PG_tail | |
980 | * to PG_head and switch the pfn from a tail page to the head | |
981 | * page accordingly. | |
982 | */ | |
983 | mask = PTRS_PER_PMD - 1; | |
984 | VM_BUG_ON((gfn & mask) != (pfn & mask)); | |
985 | if (pfn & mask) { | |
986 | *ipap &= PMD_MASK; | |
987 | kvm_release_pfn_clean(pfn); | |
988 | pfn &= ~mask; | |
989 | kvm_get_pfn(pfn); | |
990 | *pfnp = pfn; | |
991 | } | |
992 | ||
993 | return true; | |
994 | } | |
995 | ||
996 | return false; | |
997 | } | |
998 | ||
a7d079ce AB |
999 | static bool kvm_is_write_fault(struct kvm_vcpu *vcpu) |
1000 | { | |
1001 | if (kvm_vcpu_trap_is_iabt(vcpu)) | |
1002 | return false; | |
1003 | ||
1004 | return kvm_vcpu_dabt_iswrite(vcpu); | |
1005 | } | |
1006 | ||
bb55e9b1 AB |
1007 | static bool kvm_is_device_pfn(unsigned long pfn) |
1008 | { | |
1009 | return !pfn_valid(pfn); | |
1010 | } | |
1011 | ||
c6473555 MS |
1012 | /** |
1013 | * stage2_wp_ptes - write protect PMD range | |
1014 | * @pmd: pointer to pmd entry | |
1015 | * @addr: range start address | |
1016 | * @end: range end address | |
1017 | */ | |
1018 | static void stage2_wp_ptes(pmd_t *pmd, phys_addr_t addr, phys_addr_t end) | |
1019 | { | |
1020 | pte_t *pte; | |
1021 | ||
1022 | pte = pte_offset_kernel(pmd, addr); | |
1023 | do { | |
1024 | if (!pte_none(*pte)) { | |
1025 | if (!kvm_s2pte_readonly(pte)) | |
1026 | kvm_set_s2pte_readonly(pte); | |
1027 | } | |
1028 | } while (pte++, addr += PAGE_SIZE, addr != end); | |
1029 | } | |
1030 | ||
1031 | /** | |
1032 | * stage2_wp_pmds - write protect PUD range | |
1033 | * @pud: pointer to pud entry | |
1034 | * @addr: range start address | |
1035 | * @end: range end address | |
1036 | */ | |
1037 | static void stage2_wp_pmds(pud_t *pud, phys_addr_t addr, phys_addr_t end) | |
1038 | { | |
1039 | pmd_t *pmd; | |
1040 | phys_addr_t next; | |
1041 | ||
1042 | pmd = pmd_offset(pud, addr); | |
1043 | ||
1044 | do { | |
1045 | next = kvm_pmd_addr_end(addr, end); | |
1046 | if (!pmd_none(*pmd)) { | |
1047 | if (kvm_pmd_huge(*pmd)) { | |
1048 | if (!kvm_s2pmd_readonly(pmd)) | |
1049 | kvm_set_s2pmd_readonly(pmd); | |
1050 | } else { | |
1051 | stage2_wp_ptes(pmd, addr, next); | |
1052 | } | |
1053 | } | |
1054 | } while (pmd++, addr = next, addr != end); | |
1055 | } | |
1056 | ||
1057 | /** | |
1058 | * stage2_wp_puds - write protect PGD range | |
1059 | * @pgd: pointer to pgd entry | |
1060 | * @addr: range start address | |
1061 | * @end: range end address | |
1062 | * | |
1063 | * Process PUD entries, for a huge PUD we cause a panic. | |
1064 | */ | |
1065 | static void stage2_wp_puds(pgd_t *pgd, phys_addr_t addr, phys_addr_t end) | |
1066 | { | |
1067 | pud_t *pud; | |
1068 | phys_addr_t next; | |
1069 | ||
1070 | pud = pud_offset(pgd, addr); | |
1071 | do { | |
1072 | next = kvm_pud_addr_end(addr, end); | |
1073 | if (!pud_none(*pud)) { | |
1074 | /* TODO:PUD not supported, revisit later if supported */ | |
1075 | BUG_ON(kvm_pud_huge(*pud)); | |
1076 | stage2_wp_pmds(pud, addr, next); | |
1077 | } | |
1078 | } while (pud++, addr = next, addr != end); | |
1079 | } | |
1080 | ||
1081 | /** | |
1082 | * stage2_wp_range() - write protect stage2 memory region range | |
1083 | * @kvm: The KVM pointer | |
1084 | * @addr: Start address of range | |
1085 | * @end: End address of range | |
1086 | */ | |
1087 | static void stage2_wp_range(struct kvm *kvm, phys_addr_t addr, phys_addr_t end) | |
1088 | { | |
1089 | pgd_t *pgd; | |
1090 | phys_addr_t next; | |
1091 | ||
1092 | pgd = kvm->arch.pgd + pgd_index(addr); | |
1093 | do { | |
1094 | /* | |
1095 | * Release kvm_mmu_lock periodically if the memory region is | |
1096 | * large. Otherwise, we may see kernel panics with | |
227ea818 CD |
1097 | * CONFIG_DETECT_HUNG_TASK, CONFIG_LOCKUP_DETECTOR, |
1098 | * CONFIG_LOCKDEP. Additionally, holding the lock too long | |
c6473555 MS |
1099 | * will also starve other vCPUs. |
1100 | */ | |
1101 | if (need_resched() || spin_needbreak(&kvm->mmu_lock)) | |
1102 | cond_resched_lock(&kvm->mmu_lock); | |
1103 | ||
1104 | next = kvm_pgd_addr_end(addr, end); | |
1105 | if (pgd_present(*pgd)) | |
1106 | stage2_wp_puds(pgd, addr, next); | |
1107 | } while (pgd++, addr = next, addr != end); | |
1108 | } | |
1109 | ||
1110 | /** | |
1111 | * kvm_mmu_wp_memory_region() - write protect stage 2 entries for memory slot | |
1112 | * @kvm: The KVM pointer | |
1113 | * @slot: The memory slot to write protect | |
1114 | * | |
1115 | * Called to start logging dirty pages after memory region | |
1116 | * KVM_MEM_LOG_DIRTY_PAGES operation is called. After this function returns | |
1117 | * all present PMD and PTEs are write protected in the memory region. | |
1118 | * Afterwards read of dirty page log can be called. | |
1119 | * | |
1120 | * Acquires kvm_mmu_lock. Called with kvm->slots_lock mutex acquired, | |
1121 | * serializing operations for VM memory regions. | |
1122 | */ | |
1123 | void kvm_mmu_wp_memory_region(struct kvm *kvm, int slot) | |
1124 | { | |
1125 | struct kvm_memory_slot *memslot = id_to_memslot(kvm->memslots, slot); | |
1126 | phys_addr_t start = memslot->base_gfn << PAGE_SHIFT; | |
1127 | phys_addr_t end = (memslot->base_gfn + memslot->npages) << PAGE_SHIFT; | |
1128 | ||
1129 | spin_lock(&kvm->mmu_lock); | |
1130 | stage2_wp_range(kvm, start, end); | |
1131 | spin_unlock(&kvm->mmu_lock); | |
1132 | kvm_flush_remote_tlbs(kvm); | |
1133 | } | |
53c810c3 MS |
1134 | |
1135 | /** | |
3b0f1d01 | 1136 | * kvm_mmu_write_protect_pt_masked() - write protect dirty pages |
53c810c3 MS |
1137 | * @kvm: The KVM pointer |
1138 | * @slot: The memory slot associated with mask | |
1139 | * @gfn_offset: The gfn offset in memory slot | |
1140 | * @mask: The mask of dirty pages at offset 'gfn_offset' in this memory | |
1141 | * slot to be write protected | |
1142 | * | |
1143 | * Walks bits set in mask write protects the associated pte's. Caller must | |
1144 | * acquire kvm_mmu_lock. | |
1145 | */ | |
3b0f1d01 | 1146 | static void kvm_mmu_write_protect_pt_masked(struct kvm *kvm, |
53c810c3 MS |
1147 | struct kvm_memory_slot *slot, |
1148 | gfn_t gfn_offset, unsigned long mask) | |
1149 | { | |
1150 | phys_addr_t base_gfn = slot->base_gfn + gfn_offset; | |
1151 | phys_addr_t start = (base_gfn + __ffs(mask)) << PAGE_SHIFT; | |
1152 | phys_addr_t end = (base_gfn + __fls(mask) + 1) << PAGE_SHIFT; | |
1153 | ||
1154 | stage2_wp_range(kvm, start, end); | |
1155 | } | |
c6473555 | 1156 | |
3b0f1d01 KH |
1157 | /* |
1158 | * kvm_arch_mmu_enable_log_dirty_pt_masked - enable dirty logging for selected | |
1159 | * dirty pages. | |
1160 | * | |
1161 | * It calls kvm_mmu_write_protect_pt_masked to write protect selected pages to | |
1162 | * enable dirty logging for them. | |
1163 | */ | |
1164 | void kvm_arch_mmu_enable_log_dirty_pt_masked(struct kvm *kvm, | |
1165 | struct kvm_memory_slot *slot, | |
1166 | gfn_t gfn_offset, unsigned long mask) | |
1167 | { | |
1168 | kvm_mmu_write_protect_pt_masked(kvm, slot, gfn_offset, mask); | |
1169 | } | |
1170 | ||
0d3e4d4f MZ |
1171 | static void coherent_cache_guest_page(struct kvm_vcpu *vcpu, pfn_t pfn, |
1172 | unsigned long size, bool uncached) | |
1173 | { | |
1174 | __coherent_cache_guest_page(vcpu, pfn, size, uncached); | |
1175 | } | |
1176 | ||
94f8e641 | 1177 | static int user_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa, |
98047888 | 1178 | struct kvm_memory_slot *memslot, unsigned long hva, |
94f8e641 CD |
1179 | unsigned long fault_status) |
1180 | { | |
94f8e641 | 1181 | int ret; |
9b5fdb97 | 1182 | bool write_fault, writable, hugetlb = false, force_pte = false; |
94f8e641 | 1183 | unsigned long mmu_seq; |
ad361f09 | 1184 | gfn_t gfn = fault_ipa >> PAGE_SHIFT; |
ad361f09 | 1185 | struct kvm *kvm = vcpu->kvm; |
94f8e641 | 1186 | struct kvm_mmu_memory_cache *memcache = &vcpu->arch.mmu_page_cache; |
ad361f09 CD |
1187 | struct vm_area_struct *vma; |
1188 | pfn_t pfn; | |
b8865767 | 1189 | pgprot_t mem_type = PAGE_S2; |
840f4bfb | 1190 | bool fault_ipa_uncached; |
15a49a44 MS |
1191 | bool logging_active = memslot_is_logging(memslot); |
1192 | unsigned long flags = 0; | |
94f8e641 | 1193 | |
a7d079ce | 1194 | write_fault = kvm_is_write_fault(vcpu); |
94f8e641 CD |
1195 | if (fault_status == FSC_PERM && !write_fault) { |
1196 | kvm_err("Unexpected L2 read permission error\n"); | |
1197 | return -EFAULT; | |
1198 | } | |
1199 | ||
ad361f09 CD |
1200 | /* Let's check if we will get back a huge page backed by hugetlbfs */ |
1201 | down_read(¤t->mm->mmap_sem); | |
1202 | vma = find_vma_intersection(current->mm, hva, hva + 1); | |
37b54408 AB |
1203 | if (unlikely(!vma)) { |
1204 | kvm_err("Failed to find VMA for hva 0x%lx\n", hva); | |
1205 | up_read(¤t->mm->mmap_sem); | |
1206 | return -EFAULT; | |
1207 | } | |
1208 | ||
15a49a44 | 1209 | if (is_vm_hugetlb_page(vma) && !logging_active) { |
ad361f09 CD |
1210 | hugetlb = true; |
1211 | gfn = (fault_ipa & PMD_MASK) >> PAGE_SHIFT; | |
9b5fdb97 CD |
1212 | } else { |
1213 | /* | |
136d737f MZ |
1214 | * Pages belonging to memslots that don't have the same |
1215 | * alignment for userspace and IPA cannot be mapped using | |
1216 | * block descriptors even if the pages belong to a THP for | |
1217 | * the process, because the stage-2 block descriptor will | |
1218 | * cover more than a single THP and we loose atomicity for | |
1219 | * unmapping, updates, and splits of the THP or other pages | |
1220 | * in the stage-2 block range. | |
9b5fdb97 | 1221 | */ |
136d737f MZ |
1222 | if ((memslot->userspace_addr & ~PMD_MASK) != |
1223 | ((memslot->base_gfn << PAGE_SHIFT) & ~PMD_MASK)) | |
9b5fdb97 | 1224 | force_pte = true; |
ad361f09 CD |
1225 | } |
1226 | up_read(¤t->mm->mmap_sem); | |
1227 | ||
94f8e641 | 1228 | /* We need minimum second+third level pages */ |
38f791a4 CD |
1229 | ret = mmu_topup_memory_cache(memcache, KVM_MMU_CACHE_MIN_PAGES, |
1230 | KVM_NR_MEM_OBJS); | |
94f8e641 CD |
1231 | if (ret) |
1232 | return ret; | |
1233 | ||
1234 | mmu_seq = vcpu->kvm->mmu_notifier_seq; | |
1235 | /* | |
1236 | * Ensure the read of mmu_notifier_seq happens before we call | |
1237 | * gfn_to_pfn_prot (which calls get_user_pages), so that we don't risk | |
1238 | * the page we just got a reference to gets unmapped before we have a | |
1239 | * chance to grab the mmu_lock, which ensure that if the page gets | |
1240 | * unmapped afterwards, the call to kvm_unmap_hva will take it away | |
1241 | * from us again properly. This smp_rmb() interacts with the smp_wmb() | |
1242 | * in kvm_mmu_notifier_invalidate_<page|range_end>. | |
1243 | */ | |
1244 | smp_rmb(); | |
1245 | ||
ad361f09 | 1246 | pfn = gfn_to_pfn_prot(kvm, gfn, write_fault, &writable); |
94f8e641 CD |
1247 | if (is_error_pfn(pfn)) |
1248 | return -EFAULT; | |
1249 | ||
15a49a44 | 1250 | if (kvm_is_device_pfn(pfn)) { |
b8865767 | 1251 | mem_type = PAGE_S2_DEVICE; |
15a49a44 MS |
1252 | flags |= KVM_S2PTE_FLAG_IS_IOMAP; |
1253 | } else if (logging_active) { | |
1254 | /* | |
1255 | * Faults on pages in a memslot with logging enabled | |
1256 | * should not be mapped with huge pages (it introduces churn | |
1257 | * and performance degradation), so force a pte mapping. | |
1258 | */ | |
1259 | force_pte = true; | |
1260 | flags |= KVM_S2_FLAG_LOGGING_ACTIVE; | |
1261 | ||
1262 | /* | |
1263 | * Only actually map the page as writable if this was a write | |
1264 | * fault. | |
1265 | */ | |
1266 | if (!write_fault) | |
1267 | writable = false; | |
1268 | } | |
b8865767 | 1269 | |
ad361f09 CD |
1270 | spin_lock(&kvm->mmu_lock); |
1271 | if (mmu_notifier_retry(kvm, mmu_seq)) | |
94f8e641 | 1272 | goto out_unlock; |
15a49a44 | 1273 | |
9b5fdb97 CD |
1274 | if (!hugetlb && !force_pte) |
1275 | hugetlb = transparent_hugepage_adjust(&pfn, &fault_ipa); | |
ad361f09 | 1276 | |
849260c7 | 1277 | fault_ipa_uncached = memslot->flags & KVM_MEMSLOT_INCOHERENT; |
840f4bfb | 1278 | |
ad361f09 | 1279 | if (hugetlb) { |
b8865767 | 1280 | pmd_t new_pmd = pfn_pmd(pfn, mem_type); |
ad361f09 CD |
1281 | new_pmd = pmd_mkhuge(new_pmd); |
1282 | if (writable) { | |
1283 | kvm_set_s2pmd_writable(&new_pmd); | |
1284 | kvm_set_pfn_dirty(pfn); | |
1285 | } | |
0d3e4d4f | 1286 | coherent_cache_guest_page(vcpu, pfn, PMD_SIZE, fault_ipa_uncached); |
ad361f09 CD |
1287 | ret = stage2_set_pmd_huge(kvm, memcache, fault_ipa, &new_pmd); |
1288 | } else { | |
b8865767 | 1289 | pte_t new_pte = pfn_pte(pfn, mem_type); |
15a49a44 | 1290 | |
ad361f09 CD |
1291 | if (writable) { |
1292 | kvm_set_s2pte_writable(&new_pte); | |
1293 | kvm_set_pfn_dirty(pfn); | |
15a49a44 | 1294 | mark_page_dirty(kvm, gfn); |
ad361f09 | 1295 | } |
0d3e4d4f | 1296 | coherent_cache_guest_page(vcpu, pfn, PAGE_SIZE, fault_ipa_uncached); |
15a49a44 | 1297 | ret = stage2_set_pte(kvm, memcache, fault_ipa, &new_pte, flags); |
94f8e641 | 1298 | } |
ad361f09 | 1299 | |
94f8e641 | 1300 | out_unlock: |
ad361f09 | 1301 | spin_unlock(&kvm->mmu_lock); |
94f8e641 | 1302 | kvm_release_pfn_clean(pfn); |
ad361f09 | 1303 | return ret; |
94f8e641 CD |
1304 | } |
1305 | ||
1306 | /** | |
1307 | * kvm_handle_guest_abort - handles all 2nd stage aborts | |
1308 | * @vcpu: the VCPU pointer | |
1309 | * @run: the kvm_run structure | |
1310 | * | |
1311 | * Any abort that gets to the host is almost guaranteed to be caused by a | |
1312 | * missing second stage translation table entry, which can mean that either the | |
1313 | * guest simply needs more memory and we must allocate an appropriate page or it | |
1314 | * can mean that the guest tried to access I/O memory, which is emulated by user | |
1315 | * space. The distinction is based on the IPA causing the fault and whether this | |
1316 | * memory region has been registered as standard RAM by user space. | |
1317 | */ | |
342cd0ab CD |
1318 | int kvm_handle_guest_abort(struct kvm_vcpu *vcpu, struct kvm_run *run) |
1319 | { | |
94f8e641 CD |
1320 | unsigned long fault_status; |
1321 | phys_addr_t fault_ipa; | |
1322 | struct kvm_memory_slot *memslot; | |
98047888 CD |
1323 | unsigned long hva; |
1324 | bool is_iabt, write_fault, writable; | |
94f8e641 CD |
1325 | gfn_t gfn; |
1326 | int ret, idx; | |
1327 | ||
52d1dba9 | 1328 | is_iabt = kvm_vcpu_trap_is_iabt(vcpu); |
7393b599 | 1329 | fault_ipa = kvm_vcpu_get_fault_ipa(vcpu); |
94f8e641 | 1330 | |
7393b599 MZ |
1331 | trace_kvm_guest_fault(*vcpu_pc(vcpu), kvm_vcpu_get_hsr(vcpu), |
1332 | kvm_vcpu_get_hfar(vcpu), fault_ipa); | |
94f8e641 CD |
1333 | |
1334 | /* Check the stage-2 fault is trans. fault or write fault */ | |
0496daa5 | 1335 | fault_status = kvm_vcpu_trap_get_fault_type(vcpu); |
94f8e641 | 1336 | if (fault_status != FSC_FAULT && fault_status != FSC_PERM) { |
0496daa5 CD |
1337 | kvm_err("Unsupported FSC: EC=%#x xFSC=%#lx ESR_EL2=%#lx\n", |
1338 | kvm_vcpu_trap_get_class(vcpu), | |
1339 | (unsigned long)kvm_vcpu_trap_get_fault(vcpu), | |
1340 | (unsigned long)kvm_vcpu_get_hsr(vcpu)); | |
94f8e641 CD |
1341 | return -EFAULT; |
1342 | } | |
1343 | ||
1344 | idx = srcu_read_lock(&vcpu->kvm->srcu); | |
1345 | ||
1346 | gfn = fault_ipa >> PAGE_SHIFT; | |
98047888 CD |
1347 | memslot = gfn_to_memslot(vcpu->kvm, gfn); |
1348 | hva = gfn_to_hva_memslot_prot(memslot, gfn, &writable); | |
a7d079ce | 1349 | write_fault = kvm_is_write_fault(vcpu); |
98047888 | 1350 | if (kvm_is_error_hva(hva) || (write_fault && !writable)) { |
94f8e641 CD |
1351 | if (is_iabt) { |
1352 | /* Prefetch Abort on I/O address */ | |
7393b599 | 1353 | kvm_inject_pabt(vcpu, kvm_vcpu_get_hfar(vcpu)); |
94f8e641 CD |
1354 | ret = 1; |
1355 | goto out_unlock; | |
1356 | } | |
1357 | ||
cfe3950c MZ |
1358 | /* |
1359 | * The IPA is reported as [MAX:12], so we need to | |
1360 | * complement it with the bottom 12 bits from the | |
1361 | * faulting VA. This is always 12 bits, irrespective | |
1362 | * of the page size. | |
1363 | */ | |
1364 | fault_ipa |= kvm_vcpu_get_hfar(vcpu) & ((1 << 12) - 1); | |
45e96ea6 | 1365 | ret = io_mem_abort(vcpu, run, fault_ipa); |
94f8e641 CD |
1366 | goto out_unlock; |
1367 | } | |
1368 | ||
c3058d5d CD |
1369 | /* Userspace should not be able to register out-of-bounds IPAs */ |
1370 | VM_BUG_ON(fault_ipa >= KVM_PHYS_SIZE); | |
1371 | ||
98047888 | 1372 | ret = user_mem_abort(vcpu, fault_ipa, memslot, hva, fault_status); |
94f8e641 CD |
1373 | if (ret == 0) |
1374 | ret = 1; | |
1375 | out_unlock: | |
1376 | srcu_read_unlock(&vcpu->kvm->srcu, idx); | |
1377 | return ret; | |
342cd0ab CD |
1378 | } |
1379 | ||
1d2ebacc MZ |
1380 | static int handle_hva_to_gpa(struct kvm *kvm, |
1381 | unsigned long start, | |
1382 | unsigned long end, | |
1383 | int (*handler)(struct kvm *kvm, | |
1384 | gpa_t gpa, void *data), | |
1385 | void *data) | |
d5d8184d CD |
1386 | { |
1387 | struct kvm_memslots *slots; | |
1388 | struct kvm_memory_slot *memslot; | |
1d2ebacc | 1389 | int ret = 0; |
d5d8184d CD |
1390 | |
1391 | slots = kvm_memslots(kvm); | |
1392 | ||
1393 | /* we only care about the pages that the guest sees */ | |
1394 | kvm_for_each_memslot(memslot, slots) { | |
1395 | unsigned long hva_start, hva_end; | |
1396 | gfn_t gfn, gfn_end; | |
1397 | ||
1398 | hva_start = max(start, memslot->userspace_addr); | |
1399 | hva_end = min(end, memslot->userspace_addr + | |
1400 | (memslot->npages << PAGE_SHIFT)); | |
1401 | if (hva_start >= hva_end) | |
1402 | continue; | |
1403 | ||
1404 | /* | |
1405 | * {gfn(page) | page intersects with [hva_start, hva_end)} = | |
1406 | * {gfn_start, gfn_start+1, ..., gfn_end-1}. | |
1407 | */ | |
1408 | gfn = hva_to_gfn_memslot(hva_start, memslot); | |
1409 | gfn_end = hva_to_gfn_memslot(hva_end + PAGE_SIZE - 1, memslot); | |
1410 | ||
1411 | for (; gfn < gfn_end; ++gfn) { | |
1412 | gpa_t gpa = gfn << PAGE_SHIFT; | |
1d2ebacc | 1413 | ret |= handler(kvm, gpa, data); |
d5d8184d CD |
1414 | } |
1415 | } | |
1d2ebacc MZ |
1416 | |
1417 | return ret; | |
d5d8184d CD |
1418 | } |
1419 | ||
1d2ebacc | 1420 | static int kvm_unmap_hva_handler(struct kvm *kvm, gpa_t gpa, void *data) |
d5d8184d CD |
1421 | { |
1422 | unmap_stage2_range(kvm, gpa, PAGE_SIZE); | |
1d2ebacc | 1423 | return 0; |
d5d8184d CD |
1424 | } |
1425 | ||
1426 | int kvm_unmap_hva(struct kvm *kvm, unsigned long hva) | |
1427 | { | |
1428 | unsigned long end = hva + PAGE_SIZE; | |
1429 | ||
1430 | if (!kvm->arch.pgd) | |
1431 | return 0; | |
1432 | ||
1433 | trace_kvm_unmap_hva(hva); | |
1434 | handle_hva_to_gpa(kvm, hva, end, &kvm_unmap_hva_handler, NULL); | |
1435 | return 0; | |
1436 | } | |
1437 | ||
1438 | int kvm_unmap_hva_range(struct kvm *kvm, | |
1439 | unsigned long start, unsigned long end) | |
1440 | { | |
1441 | if (!kvm->arch.pgd) | |
1442 | return 0; | |
1443 | ||
1444 | trace_kvm_unmap_hva_range(start, end); | |
1445 | handle_hva_to_gpa(kvm, start, end, &kvm_unmap_hva_handler, NULL); | |
1446 | return 0; | |
1447 | } | |
1448 | ||
1d2ebacc | 1449 | static int kvm_set_spte_handler(struct kvm *kvm, gpa_t gpa, void *data) |
d5d8184d CD |
1450 | { |
1451 | pte_t *pte = (pte_t *)data; | |
1452 | ||
15a49a44 MS |
1453 | /* |
1454 | * We can always call stage2_set_pte with KVM_S2PTE_FLAG_LOGGING_ACTIVE | |
1455 | * flag clear because MMU notifiers will have unmapped a huge PMD before | |
1456 | * calling ->change_pte() (which in turn calls kvm_set_spte_hva()) and | |
1457 | * therefore stage2_set_pte() never needs to clear out a huge PMD | |
1458 | * through this calling path. | |
1459 | */ | |
1460 | stage2_set_pte(kvm, NULL, gpa, pte, 0); | |
1d2ebacc | 1461 | return 0; |
d5d8184d CD |
1462 | } |
1463 | ||
1464 | ||
1465 | void kvm_set_spte_hva(struct kvm *kvm, unsigned long hva, pte_t pte) | |
1466 | { | |
1467 | unsigned long end = hva + PAGE_SIZE; | |
1468 | pte_t stage2_pte; | |
1469 | ||
1470 | if (!kvm->arch.pgd) | |
1471 | return; | |
1472 | ||
1473 | trace_kvm_set_spte_hva(hva); | |
1474 | stage2_pte = pfn_pte(pte_pfn(pte), PAGE_S2); | |
1475 | handle_hva_to_gpa(kvm, hva, end, &kvm_set_spte_handler, &stage2_pte); | |
1476 | } | |
1477 | ||
1478 | void kvm_mmu_free_memory_caches(struct kvm_vcpu *vcpu) | |
1479 | { | |
1480 | mmu_free_memory_cache(&vcpu->arch.mmu_page_cache); | |
1481 | } | |
1482 | ||
342cd0ab CD |
1483 | phys_addr_t kvm_mmu_get_httbr(void) |
1484 | { | |
342cd0ab CD |
1485 | return virt_to_phys(hyp_pgd); |
1486 | } | |
1487 | ||
5a677ce0 MZ |
1488 | phys_addr_t kvm_mmu_get_boot_httbr(void) |
1489 | { | |
1490 | return virt_to_phys(boot_hyp_pgd); | |
1491 | } | |
1492 | ||
1493 | phys_addr_t kvm_get_idmap_vector(void) | |
1494 | { | |
1495 | return hyp_idmap_vector; | |
1496 | } | |
1497 | ||
342cd0ab CD |
1498 | int kvm_mmu_init(void) |
1499 | { | |
2fb41059 MZ |
1500 | int err; |
1501 | ||
4fda342c SS |
1502 | hyp_idmap_start = kvm_virt_to_phys(__hyp_idmap_text_start); |
1503 | hyp_idmap_end = kvm_virt_to_phys(__hyp_idmap_text_end); | |
1504 | hyp_idmap_vector = kvm_virt_to_phys(__kvm_hyp_init); | |
5a677ce0 MZ |
1505 | |
1506 | if ((hyp_idmap_start ^ hyp_idmap_end) & PAGE_MASK) { | |
1507 | /* | |
1508 | * Our init code is crossing a page boundary. Allocate | |
1509 | * a bounce page, copy the code over and use that. | |
1510 | */ | |
1511 | size_t len = __hyp_idmap_text_end - __hyp_idmap_text_start; | |
1512 | phys_addr_t phys_base; | |
1513 | ||
5d4e08c4 | 1514 | init_bounce_page = (void *)__get_free_page(GFP_KERNEL); |
5a677ce0 MZ |
1515 | if (!init_bounce_page) { |
1516 | kvm_err("Couldn't allocate HYP init bounce page\n"); | |
1517 | err = -ENOMEM; | |
1518 | goto out; | |
1519 | } | |
1520 | ||
1521 | memcpy(init_bounce_page, __hyp_idmap_text_start, len); | |
1522 | /* | |
1523 | * Warning: the code we just copied to the bounce page | |
1524 | * must be flushed to the point of coherency. | |
1525 | * Otherwise, the data may be sitting in L2, and HYP | |
1526 | * mode won't be able to observe it as it runs with | |
1527 | * caches off at that point. | |
1528 | */ | |
1529 | kvm_flush_dcache_to_poc(init_bounce_page, len); | |
1530 | ||
4fda342c | 1531 | phys_base = kvm_virt_to_phys(init_bounce_page); |
5a677ce0 MZ |
1532 | hyp_idmap_vector += phys_base - hyp_idmap_start; |
1533 | hyp_idmap_start = phys_base; | |
1534 | hyp_idmap_end = phys_base + len; | |
1535 | ||
1536 | kvm_info("Using HYP init bounce page @%lx\n", | |
1537 | (unsigned long)phys_base); | |
1538 | } | |
1539 | ||
38f791a4 CD |
1540 | hyp_pgd = (pgd_t *)__get_free_pages(GFP_KERNEL | __GFP_ZERO, hyp_pgd_order); |
1541 | boot_hyp_pgd = (pgd_t *)__get_free_pages(GFP_KERNEL | __GFP_ZERO, hyp_pgd_order); | |
5d4e08c4 | 1542 | |
5a677ce0 | 1543 | if (!hyp_pgd || !boot_hyp_pgd) { |
d5d8184d | 1544 | kvm_err("Hyp mode PGD not allocated\n"); |
2fb41059 MZ |
1545 | err = -ENOMEM; |
1546 | goto out; | |
1547 | } | |
1548 | ||
1549 | /* Create the idmap in the boot page tables */ | |
1550 | err = __create_hyp_mappings(boot_hyp_pgd, | |
1551 | hyp_idmap_start, hyp_idmap_end, | |
1552 | __phys_to_pfn(hyp_idmap_start), | |
1553 | PAGE_HYP); | |
1554 | ||
1555 | if (err) { | |
1556 | kvm_err("Failed to idmap %lx-%lx\n", | |
1557 | hyp_idmap_start, hyp_idmap_end); | |
1558 | goto out; | |
d5d8184d CD |
1559 | } |
1560 | ||
5a677ce0 MZ |
1561 | /* Map the very same page at the trampoline VA */ |
1562 | err = __create_hyp_mappings(boot_hyp_pgd, | |
1563 | TRAMPOLINE_VA, TRAMPOLINE_VA + PAGE_SIZE, | |
1564 | __phys_to_pfn(hyp_idmap_start), | |
1565 | PAGE_HYP); | |
1566 | if (err) { | |
1567 | kvm_err("Failed to map trampoline @%lx into boot HYP pgd\n", | |
1568 | TRAMPOLINE_VA); | |
1569 | goto out; | |
1570 | } | |
1571 | ||
1572 | /* Map the same page again into the runtime page tables */ | |
1573 | err = __create_hyp_mappings(hyp_pgd, | |
1574 | TRAMPOLINE_VA, TRAMPOLINE_VA + PAGE_SIZE, | |
1575 | __phys_to_pfn(hyp_idmap_start), | |
1576 | PAGE_HYP); | |
1577 | if (err) { | |
1578 | kvm_err("Failed to map trampoline @%lx into runtime HYP pgd\n", | |
1579 | TRAMPOLINE_VA); | |
1580 | goto out; | |
1581 | } | |
1582 | ||
d5d8184d | 1583 | return 0; |
2fb41059 | 1584 | out: |
4f728276 | 1585 | free_hyp_pgds(); |
2fb41059 | 1586 | return err; |
342cd0ab | 1587 | } |
df6ce24f EA |
1588 | |
1589 | void kvm_arch_commit_memory_region(struct kvm *kvm, | |
1590 | struct kvm_userspace_memory_region *mem, | |
1591 | const struct kvm_memory_slot *old, | |
1592 | enum kvm_mr_change change) | |
1593 | { | |
c6473555 MS |
1594 | /* |
1595 | * At this point memslot has been committed and there is an | |
1596 | * allocated dirty_bitmap[], dirty pages will be be tracked while the | |
1597 | * memory slot is write protected. | |
1598 | */ | |
1599 | if (change != KVM_MR_DELETE && mem->flags & KVM_MEM_LOG_DIRTY_PAGES) | |
1600 | kvm_mmu_wp_memory_region(kvm, mem->slot); | |
df6ce24f EA |
1601 | } |
1602 | ||
1603 | int kvm_arch_prepare_memory_region(struct kvm *kvm, | |
1604 | struct kvm_memory_slot *memslot, | |
1605 | struct kvm_userspace_memory_region *mem, | |
1606 | enum kvm_mr_change change) | |
1607 | { | |
8eef9123 AB |
1608 | hva_t hva = mem->userspace_addr; |
1609 | hva_t reg_end = hva + mem->memory_size; | |
1610 | bool writable = !(mem->flags & KVM_MEM_READONLY); | |
1611 | int ret = 0; | |
1612 | ||
15a49a44 MS |
1613 | if (change != KVM_MR_CREATE && change != KVM_MR_MOVE && |
1614 | change != KVM_MR_FLAGS_ONLY) | |
8eef9123 AB |
1615 | return 0; |
1616 | ||
c3058d5d CD |
1617 | /* |
1618 | * Prevent userspace from creating a memory region outside of the IPA | |
1619 | * space addressable by the KVM guest IPA space. | |
1620 | */ | |
1621 | if (memslot->base_gfn + memslot->npages >= | |
1622 | (KVM_PHYS_SIZE >> PAGE_SHIFT)) | |
1623 | return -EFAULT; | |
1624 | ||
8eef9123 AB |
1625 | /* |
1626 | * A memory region could potentially cover multiple VMAs, and any holes | |
1627 | * between them, so iterate over all of them to find out if we can map | |
1628 | * any of them right now. | |
1629 | * | |
1630 | * +--------------------------------------------+ | |
1631 | * +---------------+----------------+ +----------------+ | |
1632 | * | : VMA 1 | VMA 2 | | VMA 3 : | | |
1633 | * +---------------+----------------+ +----------------+ | |
1634 | * | memory region | | |
1635 | * +--------------------------------------------+ | |
1636 | */ | |
1637 | do { | |
1638 | struct vm_area_struct *vma = find_vma(current->mm, hva); | |
1639 | hva_t vm_start, vm_end; | |
1640 | ||
1641 | if (!vma || vma->vm_start >= reg_end) | |
1642 | break; | |
1643 | ||
1644 | /* | |
1645 | * Mapping a read-only VMA is only allowed if the | |
1646 | * memory region is configured as read-only. | |
1647 | */ | |
1648 | if (writable && !(vma->vm_flags & VM_WRITE)) { | |
1649 | ret = -EPERM; | |
1650 | break; | |
1651 | } | |
1652 | ||
1653 | /* | |
1654 | * Take the intersection of this VMA with the memory region | |
1655 | */ | |
1656 | vm_start = max(hva, vma->vm_start); | |
1657 | vm_end = min(reg_end, vma->vm_end); | |
1658 | ||
1659 | if (vma->vm_flags & VM_PFNMAP) { | |
1660 | gpa_t gpa = mem->guest_phys_addr + | |
1661 | (vm_start - mem->userspace_addr); | |
1662 | phys_addr_t pa = (vma->vm_pgoff << PAGE_SHIFT) + | |
1663 | vm_start - vma->vm_start; | |
1664 | ||
15a49a44 MS |
1665 | /* IO region dirty page logging not allowed */ |
1666 | if (memslot->flags & KVM_MEM_LOG_DIRTY_PAGES) | |
1667 | return -EINVAL; | |
1668 | ||
8eef9123 AB |
1669 | ret = kvm_phys_addr_ioremap(kvm, gpa, pa, |
1670 | vm_end - vm_start, | |
1671 | writable); | |
1672 | if (ret) | |
1673 | break; | |
1674 | } | |
1675 | hva = vm_end; | |
1676 | } while (hva < reg_end); | |
1677 | ||
15a49a44 MS |
1678 | if (change == KVM_MR_FLAGS_ONLY) |
1679 | return ret; | |
1680 | ||
849260c7 AB |
1681 | spin_lock(&kvm->mmu_lock); |
1682 | if (ret) | |
8eef9123 | 1683 | unmap_stage2_range(kvm, mem->guest_phys_addr, mem->memory_size); |
849260c7 AB |
1684 | else |
1685 | stage2_flush_memslot(kvm, memslot); | |
1686 | spin_unlock(&kvm->mmu_lock); | |
8eef9123 | 1687 | return ret; |
df6ce24f EA |
1688 | } |
1689 | ||
1690 | void kvm_arch_free_memslot(struct kvm *kvm, struct kvm_memory_slot *free, | |
1691 | struct kvm_memory_slot *dont) | |
1692 | { | |
1693 | } | |
1694 | ||
1695 | int kvm_arch_create_memslot(struct kvm *kvm, struct kvm_memory_slot *slot, | |
1696 | unsigned long npages) | |
1697 | { | |
849260c7 AB |
1698 | /* |
1699 | * Readonly memslots are not incoherent with the caches by definition, | |
1700 | * but in practice, they are used mostly to emulate ROMs or NOR flashes | |
1701 | * that the guest may consider devices and hence map as uncached. | |
1702 | * To prevent incoherency issues in these cases, tag all readonly | |
1703 | * regions as incoherent. | |
1704 | */ | |
1705 | if (slot->flags & KVM_MEM_READONLY) | |
1706 | slot->flags |= KVM_MEMSLOT_INCOHERENT; | |
df6ce24f EA |
1707 | return 0; |
1708 | } | |
1709 | ||
1710 | void kvm_arch_memslots_updated(struct kvm *kvm) | |
1711 | { | |
1712 | } | |
1713 | ||
1714 | void kvm_arch_flush_shadow_all(struct kvm *kvm) | |
1715 | { | |
1716 | } | |
1717 | ||
1718 | void kvm_arch_flush_shadow_memslot(struct kvm *kvm, | |
1719 | struct kvm_memory_slot *slot) | |
1720 | { | |
8eef9123 AB |
1721 | gpa_t gpa = slot->base_gfn << PAGE_SHIFT; |
1722 | phys_addr_t size = slot->npages << PAGE_SHIFT; | |
1723 | ||
1724 | spin_lock(&kvm->mmu_lock); | |
1725 | unmap_stage2_range(kvm, gpa, size); | |
1726 | spin_unlock(&kvm->mmu_lock); | |
df6ce24f | 1727 | } |
3c1e7165 MZ |
1728 | |
1729 | /* | |
1730 | * See note at ARMv7 ARM B1.14.4 (TL;DR: S/W ops are not easily virtualized). | |
1731 | * | |
1732 | * Main problems: | |
1733 | * - S/W ops are local to a CPU (not broadcast) | |
1734 | * - We have line migration behind our back (speculation) | |
1735 | * - System caches don't support S/W at all (damn!) | |
1736 | * | |
1737 | * In the face of the above, the best we can do is to try and convert | |
1738 | * S/W ops to VA ops. Because the guest is not allowed to infer the | |
1739 | * S/W to PA mapping, it can only use S/W to nuke the whole cache, | |
1740 | * which is a rather good thing for us. | |
1741 | * | |
1742 | * Also, it is only used when turning caches on/off ("The expected | |
1743 | * usage of the cache maintenance instructions that operate by set/way | |
1744 | * is associated with the cache maintenance instructions associated | |
1745 | * with the powerdown and powerup of caches, if this is required by | |
1746 | * the implementation."). | |
1747 | * | |
1748 | * We use the following policy: | |
1749 | * | |
1750 | * - If we trap a S/W operation, we enable VM trapping to detect | |
1751 | * caches being turned on/off, and do a full clean. | |
1752 | * | |
1753 | * - We flush the caches on both caches being turned on and off. | |
1754 | * | |
1755 | * - Once the caches are enabled, we stop trapping VM ops. | |
1756 | */ | |
1757 | void kvm_set_way_flush(struct kvm_vcpu *vcpu) | |
1758 | { | |
1759 | unsigned long hcr = vcpu_get_hcr(vcpu); | |
1760 | ||
1761 | /* | |
1762 | * If this is the first time we do a S/W operation | |
1763 | * (i.e. HCR_TVM not set) flush the whole memory, and set the | |
1764 | * VM trapping. | |
1765 | * | |
1766 | * Otherwise, rely on the VM trapping to wait for the MMU + | |
1767 | * Caches to be turned off. At that point, we'll be able to | |
1768 | * clean the caches again. | |
1769 | */ | |
1770 | if (!(hcr & HCR_TVM)) { | |
1771 | trace_kvm_set_way_flush(*vcpu_pc(vcpu), | |
1772 | vcpu_has_cache_enabled(vcpu)); | |
1773 | stage2_flush_vm(vcpu->kvm); | |
1774 | vcpu_set_hcr(vcpu, hcr | HCR_TVM); | |
1775 | } | |
1776 | } | |
1777 | ||
1778 | void kvm_toggle_cache(struct kvm_vcpu *vcpu, bool was_enabled) | |
1779 | { | |
1780 | bool now_enabled = vcpu_has_cache_enabled(vcpu); | |
1781 | ||
1782 | /* | |
1783 | * If switching the MMU+caches on, need to invalidate the caches. | |
1784 | * If switching it off, need to clean the caches. | |
1785 | * Clean + invalidate does the trick always. | |
1786 | */ | |
1787 | if (now_enabled != was_enabled) | |
1788 | stage2_flush_vm(vcpu->kvm); | |
1789 | ||
1790 | /* Caches are now on, stop trapping VM ops (until a S/W op) */ | |
1791 | if (now_enabled) | |
1792 | vcpu_set_hcr(vcpu, vcpu_get_hcr(vcpu) & ~HCR_TVM); | |
1793 | ||
1794 | trace_kvm_toggle_cache(*vcpu_pc(vcpu), was_enabled, now_enabled); | |
1795 | } |