]>
Commit | Line | Data |
---|---|---|
6aa8b732 AK |
1 | /* |
2 | * Kernel-based Virtual Machine driver for Linux | |
3 | * | |
4 | * This module enables machines with Intel VT-x extensions to run virtual | |
5 | * machines without emulation or binary translation. | |
6 | * | |
7 | * Copyright (C) 2006 Qumranet, Inc. | |
9611c187 | 8 | * Copyright 2010 Red Hat, Inc. and/or its affiliates. |
6aa8b732 AK |
9 | * |
10 | * Authors: | |
11 | * Avi Kivity <avi@qumranet.com> | |
12 | * Yaniv Kamay <yaniv@qumranet.com> | |
13 | * | |
14 | * This work is licensed under the terms of the GNU GPL, version 2. See | |
15 | * the COPYING file in the top-level directory. | |
16 | * | |
17 | */ | |
18 | ||
e2174021 | 19 | #include "iodev.h" |
6aa8b732 | 20 | |
edf88417 | 21 | #include <linux/kvm_host.h> |
6aa8b732 AK |
22 | #include <linux/kvm.h> |
23 | #include <linux/module.h> | |
24 | #include <linux/errno.h> | |
6aa8b732 | 25 | #include <linux/percpu.h> |
6aa8b732 AK |
26 | #include <linux/mm.h> |
27 | #include <linux/miscdevice.h> | |
28 | #include <linux/vmalloc.h> | |
6aa8b732 | 29 | #include <linux/reboot.h> |
6aa8b732 AK |
30 | #include <linux/debugfs.h> |
31 | #include <linux/highmem.h> | |
32 | #include <linux/file.h> | |
fb3600cc | 33 | #include <linux/syscore_ops.h> |
774c47f1 | 34 | #include <linux/cpu.h> |
e8edc6e0 | 35 | #include <linux/sched.h> |
d9e368d6 AK |
36 | #include <linux/cpumask.h> |
37 | #include <linux/smp.h> | |
d6d28168 | 38 | #include <linux/anon_inodes.h> |
04d2cc77 | 39 | #include <linux/profile.h> |
7aa81cc0 | 40 | #include <linux/kvm_para.h> |
6fc138d2 | 41 | #include <linux/pagemap.h> |
8d4e1288 | 42 | #include <linux/mman.h> |
35149e21 | 43 | #include <linux/swap.h> |
e56d532f | 44 | #include <linux/bitops.h> |
547de29e | 45 | #include <linux/spinlock.h> |
6ff5894c | 46 | #include <linux/compat.h> |
bc6678a3 | 47 | #include <linux/srcu.h> |
8f0b1ab6 | 48 | #include <linux/hugetlb.h> |
5a0e3ad6 | 49 | #include <linux/slab.h> |
743eeb0b SL |
50 | #include <linux/sort.h> |
51 | #include <linux/bsearch.h> | |
6aa8b732 | 52 | |
e495606d | 53 | #include <asm/processor.h> |
e495606d AK |
54 | #include <asm/io.h> |
55 | #include <asm/uaccess.h> | |
3e021bf5 | 56 | #include <asm/pgtable.h> |
6aa8b732 | 57 | |
5f94c174 | 58 | #include "coalesced_mmio.h" |
af585b92 | 59 | #include "async_pf.h" |
5f94c174 | 60 | |
229456fc MT |
61 | #define CREATE_TRACE_POINTS |
62 | #include <trace/events/kvm.h> | |
63 | ||
6aa8b732 AK |
64 | MODULE_AUTHOR("Qumranet"); |
65 | MODULE_LICENSE("GPL"); | |
66 | ||
fa40a821 MT |
67 | /* |
68 | * Ordering of locks: | |
69 | * | |
fae3a353 | 70 | * kvm->lock --> kvm->slots_lock --> kvm->irq_lock |
fa40a821 MT |
71 | */ |
72 | ||
e935b837 | 73 | DEFINE_RAW_SPINLOCK(kvm_lock); |
e9b11c17 | 74 | LIST_HEAD(vm_list); |
133de902 | 75 | |
7f59f492 | 76 | static cpumask_var_t cpus_hardware_enabled; |
10474ae8 AG |
77 | static int kvm_usage_count = 0; |
78 | static atomic_t hardware_enable_failed; | |
1b6c0168 | 79 | |
c16f862d RR |
80 | struct kmem_cache *kvm_vcpu_cache; |
81 | EXPORT_SYMBOL_GPL(kvm_vcpu_cache); | |
1165f5fe | 82 | |
15ad7146 AK |
83 | static __read_mostly struct preempt_ops kvm_preempt_ops; |
84 | ||
76f7c879 | 85 | struct dentry *kvm_debugfs_dir; |
6aa8b732 | 86 | |
bccf2150 AK |
87 | static long kvm_vcpu_ioctl(struct file *file, unsigned int ioctl, |
88 | unsigned long arg); | |
1dda606c AG |
89 | #ifdef CONFIG_COMPAT |
90 | static long kvm_vcpu_compat_ioctl(struct file *file, unsigned int ioctl, | |
91 | unsigned long arg); | |
92 | #endif | |
10474ae8 AG |
93 | static int hardware_enable_all(void); |
94 | static void hardware_disable_all(void); | |
bccf2150 | 95 | |
e93f8a0f MT |
96 | static void kvm_io_bus_destroy(struct kvm_io_bus *bus); |
97 | ||
b7c4145b AK |
98 | bool kvm_rebooting; |
99 | EXPORT_SYMBOL_GPL(kvm_rebooting); | |
4ecac3fd | 100 | |
54dee993 MT |
101 | static bool largepages_enabled = true; |
102 | ||
fa7bff8f GN |
103 | static struct page *hwpoison_page; |
104 | static pfn_t hwpoison_pfn; | |
bf998156 | 105 | |
fce92dce XG |
106 | struct page *fault_page; |
107 | pfn_t fault_pfn; | |
edba23e5 | 108 | |
c77fb9dc | 109 | inline int kvm_is_mmio_pfn(pfn_t pfn) |
cbff90a7 | 110 | { |
fc5659c8 | 111 | if (pfn_valid(pfn)) { |
22e5c47e | 112 | int reserved; |
936a5fe6 | 113 | struct page *tail = pfn_to_page(pfn); |
22e5c47e AA |
114 | struct page *head = compound_trans_head(tail); |
115 | reserved = PageReserved(head); | |
936a5fe6 | 116 | if (head != tail) { |
936a5fe6 | 117 | /* |
22e5c47e AA |
118 | * "head" is not a dangling pointer |
119 | * (compound_trans_head takes care of that) | |
120 | * but the hugepage may have been splitted | |
121 | * from under us (and we may not hold a | |
122 | * reference count on the head page so it can | |
123 | * be reused before we run PageReferenced), so | |
124 | * we've to check PageTail before returning | |
125 | * what we just read. | |
936a5fe6 | 126 | */ |
22e5c47e AA |
127 | smp_rmb(); |
128 | if (PageTail(tail)) | |
129 | return reserved; | |
936a5fe6 AA |
130 | } |
131 | return PageReserved(tail); | |
fc5659c8 | 132 | } |
cbff90a7 BAY |
133 | |
134 | return true; | |
135 | } | |
136 | ||
bccf2150 AK |
137 | /* |
138 | * Switches to specified vcpu, until a matching vcpu_put() | |
139 | */ | |
313a3dc7 | 140 | void vcpu_load(struct kvm_vcpu *vcpu) |
6aa8b732 | 141 | { |
15ad7146 AK |
142 | int cpu; |
143 | ||
bccf2150 | 144 | mutex_lock(&vcpu->mutex); |
34bb10b7 RR |
145 | if (unlikely(vcpu->pid != current->pids[PIDTYPE_PID].pid)) { |
146 | /* The thread running this VCPU changed. */ | |
147 | struct pid *oldpid = vcpu->pid; | |
148 | struct pid *newpid = get_task_pid(current, PIDTYPE_PID); | |
149 | rcu_assign_pointer(vcpu->pid, newpid); | |
150 | synchronize_rcu(); | |
151 | put_pid(oldpid); | |
152 | } | |
15ad7146 AK |
153 | cpu = get_cpu(); |
154 | preempt_notifier_register(&vcpu->preempt_notifier); | |
313a3dc7 | 155 | kvm_arch_vcpu_load(vcpu, cpu); |
15ad7146 | 156 | put_cpu(); |
6aa8b732 AK |
157 | } |
158 | ||
313a3dc7 | 159 | void vcpu_put(struct kvm_vcpu *vcpu) |
6aa8b732 | 160 | { |
15ad7146 | 161 | preempt_disable(); |
313a3dc7 | 162 | kvm_arch_vcpu_put(vcpu); |
15ad7146 AK |
163 | preempt_notifier_unregister(&vcpu->preempt_notifier); |
164 | preempt_enable(); | |
6aa8b732 AK |
165 | mutex_unlock(&vcpu->mutex); |
166 | } | |
167 | ||
d9e368d6 AK |
168 | static void ack_flush(void *_completed) |
169 | { | |
d9e368d6 AK |
170 | } |
171 | ||
49846896 | 172 | static bool make_all_cpus_request(struct kvm *kvm, unsigned int req) |
d9e368d6 | 173 | { |
597a5f55 | 174 | int i, cpu, me; |
6ef7a1bc RR |
175 | cpumask_var_t cpus; |
176 | bool called = true; | |
d9e368d6 | 177 | struct kvm_vcpu *vcpu; |
d9e368d6 | 178 | |
79f55997 | 179 | zalloc_cpumask_var(&cpus, GFP_ATOMIC); |
6ef7a1bc | 180 | |
3cba4130 | 181 | me = get_cpu(); |
988a2cae | 182 | kvm_for_each_vcpu(i, vcpu, kvm) { |
3cba4130 | 183 | kvm_make_request(req, vcpu); |
d9e368d6 | 184 | cpu = vcpu->cpu; |
6b7e2d09 XG |
185 | |
186 | /* Set ->requests bit before we read ->mode */ | |
187 | smp_mb(); | |
188 | ||
189 | if (cpus != NULL && cpu != -1 && cpu != me && | |
190 | kvm_vcpu_exiting_guest_mode(vcpu) != OUTSIDE_GUEST_MODE) | |
6ef7a1bc | 191 | cpumask_set_cpu(cpu, cpus); |
49846896 | 192 | } |
6ef7a1bc RR |
193 | if (unlikely(cpus == NULL)) |
194 | smp_call_function_many(cpu_online_mask, ack_flush, NULL, 1); | |
195 | else if (!cpumask_empty(cpus)) | |
196 | smp_call_function_many(cpus, ack_flush, NULL, 1); | |
197 | else | |
198 | called = false; | |
3cba4130 | 199 | put_cpu(); |
6ef7a1bc | 200 | free_cpumask_var(cpus); |
49846896 | 201 | return called; |
d9e368d6 AK |
202 | } |
203 | ||
49846896 | 204 | void kvm_flush_remote_tlbs(struct kvm *kvm) |
2e53d63a | 205 | { |
bec87d6e | 206 | long dirty_count = kvm->tlbs_dirty; |
a4ee1ca4 XG |
207 | |
208 | smp_mb(); | |
49846896 RR |
209 | if (make_all_cpus_request(kvm, KVM_REQ_TLB_FLUSH)) |
210 | ++kvm->stat.remote_tlb_flush; | |
a4ee1ca4 | 211 | cmpxchg(&kvm->tlbs_dirty, dirty_count, 0); |
2e53d63a MT |
212 | } |
213 | ||
49846896 RR |
214 | void kvm_reload_remote_mmus(struct kvm *kvm) |
215 | { | |
216 | make_all_cpus_request(kvm, KVM_REQ_MMU_RELOAD); | |
217 | } | |
2e53d63a | 218 | |
fb3f0f51 RR |
219 | int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id) |
220 | { | |
221 | struct page *page; | |
222 | int r; | |
223 | ||
224 | mutex_init(&vcpu->mutex); | |
225 | vcpu->cpu = -1; | |
fb3f0f51 RR |
226 | vcpu->kvm = kvm; |
227 | vcpu->vcpu_id = id; | |
34bb10b7 | 228 | vcpu->pid = NULL; |
b6958ce4 | 229 | init_waitqueue_head(&vcpu->wq); |
af585b92 | 230 | kvm_async_pf_vcpu_init(vcpu); |
fb3f0f51 RR |
231 | |
232 | page = alloc_page(GFP_KERNEL | __GFP_ZERO); | |
233 | if (!page) { | |
234 | r = -ENOMEM; | |
235 | goto fail; | |
236 | } | |
237 | vcpu->run = page_address(page); | |
238 | ||
e9b11c17 | 239 | r = kvm_arch_vcpu_init(vcpu); |
fb3f0f51 | 240 | if (r < 0) |
e9b11c17 | 241 | goto fail_free_run; |
fb3f0f51 RR |
242 | return 0; |
243 | ||
fb3f0f51 RR |
244 | fail_free_run: |
245 | free_page((unsigned long)vcpu->run); | |
246 | fail: | |
76fafa5e | 247 | return r; |
fb3f0f51 RR |
248 | } |
249 | EXPORT_SYMBOL_GPL(kvm_vcpu_init); | |
250 | ||
251 | void kvm_vcpu_uninit(struct kvm_vcpu *vcpu) | |
252 | { | |
34bb10b7 | 253 | put_pid(vcpu->pid); |
e9b11c17 | 254 | kvm_arch_vcpu_uninit(vcpu); |
fb3f0f51 RR |
255 | free_page((unsigned long)vcpu->run); |
256 | } | |
257 | EXPORT_SYMBOL_GPL(kvm_vcpu_uninit); | |
258 | ||
e930bffe AA |
259 | #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER) |
260 | static inline struct kvm *mmu_notifier_to_kvm(struct mmu_notifier *mn) | |
261 | { | |
262 | return container_of(mn, struct kvm, mmu_notifier); | |
263 | } | |
264 | ||
265 | static void kvm_mmu_notifier_invalidate_page(struct mmu_notifier *mn, | |
266 | struct mm_struct *mm, | |
267 | unsigned long address) | |
268 | { | |
269 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
bc6678a3 | 270 | int need_tlb_flush, idx; |
e930bffe AA |
271 | |
272 | /* | |
273 | * When ->invalidate_page runs, the linux pte has been zapped | |
274 | * already but the page is still allocated until | |
275 | * ->invalidate_page returns. So if we increase the sequence | |
276 | * here the kvm page fault will notice if the spte can't be | |
277 | * established because the page is going to be freed. If | |
278 | * instead the kvm page fault establishes the spte before | |
279 | * ->invalidate_page runs, kvm_unmap_hva will release it | |
280 | * before returning. | |
281 | * | |
282 | * The sequence increase only need to be seen at spin_unlock | |
283 | * time, and not at spin_lock time. | |
284 | * | |
285 | * Increasing the sequence after the spin_unlock would be | |
286 | * unsafe because the kvm page fault could then establish the | |
287 | * pte after kvm_unmap_hva returned, without noticing the page | |
288 | * is going to be freed. | |
289 | */ | |
bc6678a3 | 290 | idx = srcu_read_lock(&kvm->srcu); |
e930bffe | 291 | spin_lock(&kvm->mmu_lock); |
565f3be2 | 292 | |
e930bffe | 293 | kvm->mmu_notifier_seq++; |
a4ee1ca4 | 294 | need_tlb_flush = kvm_unmap_hva(kvm, address) | kvm->tlbs_dirty; |
e930bffe AA |
295 | /* we've to flush the tlb before the pages can be freed */ |
296 | if (need_tlb_flush) | |
297 | kvm_flush_remote_tlbs(kvm); | |
298 | ||
565f3be2 TY |
299 | spin_unlock(&kvm->mmu_lock); |
300 | srcu_read_unlock(&kvm->srcu, idx); | |
e930bffe AA |
301 | } |
302 | ||
3da0dd43 IE |
303 | static void kvm_mmu_notifier_change_pte(struct mmu_notifier *mn, |
304 | struct mm_struct *mm, | |
305 | unsigned long address, | |
306 | pte_t pte) | |
307 | { | |
308 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
bc6678a3 | 309 | int idx; |
3da0dd43 | 310 | |
bc6678a3 | 311 | idx = srcu_read_lock(&kvm->srcu); |
3da0dd43 IE |
312 | spin_lock(&kvm->mmu_lock); |
313 | kvm->mmu_notifier_seq++; | |
314 | kvm_set_spte_hva(kvm, address, pte); | |
315 | spin_unlock(&kvm->mmu_lock); | |
bc6678a3 | 316 | srcu_read_unlock(&kvm->srcu, idx); |
3da0dd43 IE |
317 | } |
318 | ||
e930bffe AA |
319 | static void kvm_mmu_notifier_invalidate_range_start(struct mmu_notifier *mn, |
320 | struct mm_struct *mm, | |
321 | unsigned long start, | |
322 | unsigned long end) | |
323 | { | |
324 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
bc6678a3 | 325 | int need_tlb_flush = 0, idx; |
e930bffe | 326 | |
bc6678a3 | 327 | idx = srcu_read_lock(&kvm->srcu); |
e930bffe AA |
328 | spin_lock(&kvm->mmu_lock); |
329 | /* | |
330 | * The count increase must become visible at unlock time as no | |
331 | * spte can be established without taking the mmu_lock and | |
332 | * count is also read inside the mmu_lock critical section. | |
333 | */ | |
334 | kvm->mmu_notifier_count++; | |
335 | for (; start < end; start += PAGE_SIZE) | |
336 | need_tlb_flush |= kvm_unmap_hva(kvm, start); | |
a4ee1ca4 | 337 | need_tlb_flush |= kvm->tlbs_dirty; |
e930bffe AA |
338 | /* we've to flush the tlb before the pages can be freed */ |
339 | if (need_tlb_flush) | |
340 | kvm_flush_remote_tlbs(kvm); | |
565f3be2 TY |
341 | |
342 | spin_unlock(&kvm->mmu_lock); | |
343 | srcu_read_unlock(&kvm->srcu, idx); | |
e930bffe AA |
344 | } |
345 | ||
346 | static void kvm_mmu_notifier_invalidate_range_end(struct mmu_notifier *mn, | |
347 | struct mm_struct *mm, | |
348 | unsigned long start, | |
349 | unsigned long end) | |
350 | { | |
351 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
352 | ||
353 | spin_lock(&kvm->mmu_lock); | |
354 | /* | |
355 | * This sequence increase will notify the kvm page fault that | |
356 | * the page that is going to be mapped in the spte could have | |
357 | * been freed. | |
358 | */ | |
359 | kvm->mmu_notifier_seq++; | |
a355aa54 | 360 | smp_wmb(); |
e930bffe AA |
361 | /* |
362 | * The above sequence increase must be visible before the | |
a355aa54 PM |
363 | * below count decrease, which is ensured by the smp_wmb above |
364 | * in conjunction with the smp_rmb in mmu_notifier_retry(). | |
e930bffe AA |
365 | */ |
366 | kvm->mmu_notifier_count--; | |
367 | spin_unlock(&kvm->mmu_lock); | |
368 | ||
369 | BUG_ON(kvm->mmu_notifier_count < 0); | |
370 | } | |
371 | ||
372 | static int kvm_mmu_notifier_clear_flush_young(struct mmu_notifier *mn, | |
373 | struct mm_struct *mm, | |
374 | unsigned long address) | |
375 | { | |
376 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
bc6678a3 | 377 | int young, idx; |
e930bffe | 378 | |
bc6678a3 | 379 | idx = srcu_read_lock(&kvm->srcu); |
e930bffe | 380 | spin_lock(&kvm->mmu_lock); |
e930bffe | 381 | |
565f3be2 | 382 | young = kvm_age_hva(kvm, address); |
e930bffe AA |
383 | if (young) |
384 | kvm_flush_remote_tlbs(kvm); | |
385 | ||
565f3be2 TY |
386 | spin_unlock(&kvm->mmu_lock); |
387 | srcu_read_unlock(&kvm->srcu, idx); | |
388 | ||
e930bffe AA |
389 | return young; |
390 | } | |
391 | ||
8ee53820 AA |
392 | static int kvm_mmu_notifier_test_young(struct mmu_notifier *mn, |
393 | struct mm_struct *mm, | |
394 | unsigned long address) | |
395 | { | |
396 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
397 | int young, idx; | |
398 | ||
399 | idx = srcu_read_lock(&kvm->srcu); | |
400 | spin_lock(&kvm->mmu_lock); | |
401 | young = kvm_test_age_hva(kvm, address); | |
402 | spin_unlock(&kvm->mmu_lock); | |
403 | srcu_read_unlock(&kvm->srcu, idx); | |
404 | ||
405 | return young; | |
406 | } | |
407 | ||
85db06e5 MT |
408 | static void kvm_mmu_notifier_release(struct mmu_notifier *mn, |
409 | struct mm_struct *mm) | |
410 | { | |
411 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
eda2beda LJ |
412 | int idx; |
413 | ||
414 | idx = srcu_read_lock(&kvm->srcu); | |
85db06e5 | 415 | kvm_arch_flush_shadow(kvm); |
eda2beda | 416 | srcu_read_unlock(&kvm->srcu, idx); |
85db06e5 MT |
417 | } |
418 | ||
e930bffe AA |
419 | static const struct mmu_notifier_ops kvm_mmu_notifier_ops = { |
420 | .invalidate_page = kvm_mmu_notifier_invalidate_page, | |
421 | .invalidate_range_start = kvm_mmu_notifier_invalidate_range_start, | |
422 | .invalidate_range_end = kvm_mmu_notifier_invalidate_range_end, | |
423 | .clear_flush_young = kvm_mmu_notifier_clear_flush_young, | |
8ee53820 | 424 | .test_young = kvm_mmu_notifier_test_young, |
3da0dd43 | 425 | .change_pte = kvm_mmu_notifier_change_pte, |
85db06e5 | 426 | .release = kvm_mmu_notifier_release, |
e930bffe | 427 | }; |
4c07b0a4 AK |
428 | |
429 | static int kvm_init_mmu_notifier(struct kvm *kvm) | |
430 | { | |
431 | kvm->mmu_notifier.ops = &kvm_mmu_notifier_ops; | |
432 | return mmu_notifier_register(&kvm->mmu_notifier, current->mm); | |
433 | } | |
434 | ||
435 | #else /* !(CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER) */ | |
436 | ||
437 | static int kvm_init_mmu_notifier(struct kvm *kvm) | |
438 | { | |
439 | return 0; | |
440 | } | |
441 | ||
e930bffe AA |
442 | #endif /* CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER */ |
443 | ||
bf3e05bc XG |
444 | static void kvm_init_memslots_id(struct kvm *kvm) |
445 | { | |
446 | int i; | |
447 | struct kvm_memslots *slots = kvm->memslots; | |
448 | ||
449 | for (i = 0; i < KVM_MEM_SLOTS_NUM; i++) | |
f85e2cb5 | 450 | slots->id_to_index[i] = slots->memslots[i].id = i; |
bf3e05bc XG |
451 | } |
452 | ||
e08b9637 | 453 | static struct kvm *kvm_create_vm(unsigned long type) |
6aa8b732 | 454 | { |
d89f5eff JK |
455 | int r, i; |
456 | struct kvm *kvm = kvm_arch_alloc_vm(); | |
6aa8b732 | 457 | |
d89f5eff JK |
458 | if (!kvm) |
459 | return ERR_PTR(-ENOMEM); | |
460 | ||
e08b9637 | 461 | r = kvm_arch_init_vm(kvm, type); |
d89f5eff JK |
462 | if (r) |
463 | goto out_err_nodisable; | |
10474ae8 AG |
464 | |
465 | r = hardware_enable_all(); | |
466 | if (r) | |
467 | goto out_err_nodisable; | |
468 | ||
75858a84 AK |
469 | #ifdef CONFIG_HAVE_KVM_IRQCHIP |
470 | INIT_HLIST_HEAD(&kvm->mask_notifier_list); | |
136bdfee | 471 | INIT_HLIST_HEAD(&kvm->irq_ack_notifier_list); |
75858a84 | 472 | #endif |
6aa8b732 | 473 | |
46a26bf5 MT |
474 | r = -ENOMEM; |
475 | kvm->memslots = kzalloc(sizeof(struct kvm_memslots), GFP_KERNEL); | |
476 | if (!kvm->memslots) | |
57e7fbee | 477 | goto out_err_nosrcu; |
bf3e05bc | 478 | kvm_init_memslots_id(kvm); |
bc6678a3 | 479 | if (init_srcu_struct(&kvm->srcu)) |
57e7fbee | 480 | goto out_err_nosrcu; |
e93f8a0f MT |
481 | for (i = 0; i < KVM_NR_BUSES; i++) { |
482 | kvm->buses[i] = kzalloc(sizeof(struct kvm_io_bus), | |
483 | GFP_KERNEL); | |
57e7fbee | 484 | if (!kvm->buses[i]) |
e93f8a0f | 485 | goto out_err; |
e93f8a0f | 486 | } |
e930bffe | 487 | |
74b5c5bf | 488 | spin_lock_init(&kvm->mmu_lock); |
6d4e4c4f AK |
489 | kvm->mm = current->mm; |
490 | atomic_inc(&kvm->mm->mm_count); | |
d34e6b17 | 491 | kvm_eventfd_init(kvm); |
11ec2804 | 492 | mutex_init(&kvm->lock); |
60eead79 | 493 | mutex_init(&kvm->irq_lock); |
79fac95e | 494 | mutex_init(&kvm->slots_lock); |
d39f13b0 | 495 | atomic_set(&kvm->users_count, 1); |
74b5c5bf MW |
496 | |
497 | r = kvm_init_mmu_notifier(kvm); | |
498 | if (r) | |
499 | goto out_err; | |
500 | ||
e935b837 | 501 | raw_spin_lock(&kvm_lock); |
5e58cfe4 | 502 | list_add(&kvm->vm_list, &vm_list); |
e935b837 | 503 | raw_spin_unlock(&kvm_lock); |
d89f5eff | 504 | |
f17abe9a | 505 | return kvm; |
10474ae8 AG |
506 | |
507 | out_err: | |
57e7fbee JK |
508 | cleanup_srcu_struct(&kvm->srcu); |
509 | out_err_nosrcu: | |
10474ae8 AG |
510 | hardware_disable_all(); |
511 | out_err_nodisable: | |
e93f8a0f MT |
512 | for (i = 0; i < KVM_NR_BUSES; i++) |
513 | kfree(kvm->buses[i]); | |
46a26bf5 | 514 | kfree(kvm->memslots); |
d89f5eff | 515 | kvm_arch_free_vm(kvm); |
10474ae8 | 516 | return ERR_PTR(r); |
f17abe9a AK |
517 | } |
518 | ||
92eca8fa TY |
519 | /* |
520 | * Avoid using vmalloc for a small buffer. | |
521 | * Should not be used when the size is statically known. | |
522 | */ | |
c1a7b32a | 523 | void *kvm_kvzalloc(unsigned long size) |
92eca8fa TY |
524 | { |
525 | if (size > PAGE_SIZE) | |
526 | return vzalloc(size); | |
527 | else | |
528 | return kzalloc(size, GFP_KERNEL); | |
529 | } | |
530 | ||
c1a7b32a | 531 | void kvm_kvfree(const void *addr) |
92eca8fa TY |
532 | { |
533 | if (is_vmalloc_addr(addr)) | |
534 | vfree(addr); | |
535 | else | |
536 | kfree(addr); | |
537 | } | |
538 | ||
a36a57b1 TY |
539 | static void kvm_destroy_dirty_bitmap(struct kvm_memory_slot *memslot) |
540 | { | |
541 | if (!memslot->dirty_bitmap) | |
542 | return; | |
543 | ||
92eca8fa | 544 | kvm_kvfree(memslot->dirty_bitmap); |
a36a57b1 TY |
545 | memslot->dirty_bitmap = NULL; |
546 | } | |
547 | ||
6aa8b732 AK |
548 | /* |
549 | * Free any memory in @free but not in @dont. | |
550 | */ | |
551 | static void kvm_free_physmem_slot(struct kvm_memory_slot *free, | |
552 | struct kvm_memory_slot *dont) | |
553 | { | |
290fc38d IE |
554 | if (!dont || free->rmap != dont->rmap) |
555 | vfree(free->rmap); | |
6aa8b732 AK |
556 | |
557 | if (!dont || free->dirty_bitmap != dont->dirty_bitmap) | |
a36a57b1 | 558 | kvm_destroy_dirty_bitmap(free); |
6aa8b732 | 559 | |
db3fe4eb | 560 | kvm_arch_free_memslot(free, dont); |
05da4558 | 561 | |
6aa8b732 | 562 | free->npages = 0; |
8d4e1288 | 563 | free->rmap = NULL; |
6aa8b732 AK |
564 | } |
565 | ||
d19a9cd2 | 566 | void kvm_free_physmem(struct kvm *kvm) |
6aa8b732 | 567 | { |
46a26bf5 | 568 | struct kvm_memslots *slots = kvm->memslots; |
be6ba0f0 | 569 | struct kvm_memory_slot *memslot; |
46a26bf5 | 570 | |
be6ba0f0 XG |
571 | kvm_for_each_memslot(memslot, slots) |
572 | kvm_free_physmem_slot(memslot, NULL); | |
6aa8b732 | 573 | |
46a26bf5 | 574 | kfree(kvm->memslots); |
6aa8b732 AK |
575 | } |
576 | ||
f17abe9a AK |
577 | static void kvm_destroy_vm(struct kvm *kvm) |
578 | { | |
e93f8a0f | 579 | int i; |
6d4e4c4f AK |
580 | struct mm_struct *mm = kvm->mm; |
581 | ||
ad8ba2cd | 582 | kvm_arch_sync_events(kvm); |
e935b837 | 583 | raw_spin_lock(&kvm_lock); |
133de902 | 584 | list_del(&kvm->vm_list); |
e935b837 | 585 | raw_spin_unlock(&kvm_lock); |
399ec807 | 586 | kvm_free_irq_routing(kvm); |
e93f8a0f MT |
587 | for (i = 0; i < KVM_NR_BUSES; i++) |
588 | kvm_io_bus_destroy(kvm->buses[i]); | |
980da6ce | 589 | kvm_coalesced_mmio_free(kvm); |
e930bffe AA |
590 | #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER) |
591 | mmu_notifier_unregister(&kvm->mmu_notifier, kvm->mm); | |
f00be0ca GN |
592 | #else |
593 | kvm_arch_flush_shadow(kvm); | |
5f94c174 | 594 | #endif |
d19a9cd2 | 595 | kvm_arch_destroy_vm(kvm); |
d89f5eff JK |
596 | kvm_free_physmem(kvm); |
597 | cleanup_srcu_struct(&kvm->srcu); | |
598 | kvm_arch_free_vm(kvm); | |
10474ae8 | 599 | hardware_disable_all(); |
6d4e4c4f | 600 | mmdrop(mm); |
f17abe9a AK |
601 | } |
602 | ||
d39f13b0 IE |
603 | void kvm_get_kvm(struct kvm *kvm) |
604 | { | |
605 | atomic_inc(&kvm->users_count); | |
606 | } | |
607 | EXPORT_SYMBOL_GPL(kvm_get_kvm); | |
608 | ||
609 | void kvm_put_kvm(struct kvm *kvm) | |
610 | { | |
611 | if (atomic_dec_and_test(&kvm->users_count)) | |
612 | kvm_destroy_vm(kvm); | |
613 | } | |
614 | EXPORT_SYMBOL_GPL(kvm_put_kvm); | |
615 | ||
616 | ||
f17abe9a AK |
617 | static int kvm_vm_release(struct inode *inode, struct file *filp) |
618 | { | |
619 | struct kvm *kvm = filp->private_data; | |
620 | ||
721eecbf GH |
621 | kvm_irqfd_release(kvm); |
622 | ||
d39f13b0 | 623 | kvm_put_kvm(kvm); |
6aa8b732 AK |
624 | return 0; |
625 | } | |
626 | ||
515a0127 TY |
627 | /* |
628 | * Allocation size is twice as large as the actual dirty bitmap size. | |
93474b25 | 629 | * See x86's kvm_vm_ioctl_get_dirty_log() why this is needed. |
515a0127 | 630 | */ |
a36a57b1 TY |
631 | static int kvm_create_dirty_bitmap(struct kvm_memory_slot *memslot) |
632 | { | |
189a2f7b | 633 | #ifndef CONFIG_S390 |
515a0127 | 634 | unsigned long dirty_bytes = 2 * kvm_dirty_bitmap_bytes(memslot); |
a36a57b1 | 635 | |
92eca8fa | 636 | memslot->dirty_bitmap = kvm_kvzalloc(dirty_bytes); |
a36a57b1 TY |
637 | if (!memslot->dirty_bitmap) |
638 | return -ENOMEM; | |
639 | ||
189a2f7b | 640 | #endif /* !CONFIG_S390 */ |
a36a57b1 TY |
641 | return 0; |
642 | } | |
643 | ||
bf3e05bc XG |
644 | static int cmp_memslot(const void *slot1, const void *slot2) |
645 | { | |
646 | struct kvm_memory_slot *s1, *s2; | |
647 | ||
648 | s1 = (struct kvm_memory_slot *)slot1; | |
649 | s2 = (struct kvm_memory_slot *)slot2; | |
650 | ||
651 | if (s1->npages < s2->npages) | |
652 | return 1; | |
653 | if (s1->npages > s2->npages) | |
654 | return -1; | |
655 | ||
656 | return 0; | |
657 | } | |
658 | ||
659 | /* | |
660 | * Sort the memslots base on its size, so the larger slots | |
661 | * will get better fit. | |
662 | */ | |
663 | static void sort_memslots(struct kvm_memslots *slots) | |
664 | { | |
f85e2cb5 XG |
665 | int i; |
666 | ||
bf3e05bc XG |
667 | sort(slots->memslots, KVM_MEM_SLOTS_NUM, |
668 | sizeof(struct kvm_memory_slot), cmp_memslot, NULL); | |
f85e2cb5 XG |
669 | |
670 | for (i = 0; i < KVM_MEM_SLOTS_NUM; i++) | |
671 | slots->id_to_index[slots->memslots[i].id] = i; | |
bf3e05bc XG |
672 | } |
673 | ||
be593d62 XG |
674 | void update_memslots(struct kvm_memslots *slots, struct kvm_memory_slot *new) |
675 | { | |
676 | if (new) { | |
677 | int id = new->id; | |
28a37544 | 678 | struct kvm_memory_slot *old = id_to_memslot(slots, id); |
bf3e05bc | 679 | unsigned long npages = old->npages; |
be593d62 | 680 | |
28a37544 | 681 | *old = *new; |
bf3e05bc XG |
682 | if (new->npages != npages) |
683 | sort_memslots(slots); | |
be593d62 XG |
684 | } |
685 | ||
686 | slots->generation++; | |
687 | } | |
688 | ||
6aa8b732 AK |
689 | /* |
690 | * Allocate some memory and give it an address in the guest physical address | |
691 | * space. | |
692 | * | |
693 | * Discontiguous memory is allowed, mostly for framebuffers. | |
f78e0e2e | 694 | * |
10589a46 | 695 | * Must be called holding mmap_sem for write. |
6aa8b732 | 696 | */ |
f78e0e2e SY |
697 | int __kvm_set_memory_region(struct kvm *kvm, |
698 | struct kvm_userspace_memory_region *mem, | |
699 | int user_alloc) | |
6aa8b732 | 700 | { |
8234b22e | 701 | int r; |
6aa8b732 | 702 | gfn_t base_gfn; |
28bcb112 HC |
703 | unsigned long npages; |
704 | unsigned long i; | |
6aa8b732 AK |
705 | struct kvm_memory_slot *memslot; |
706 | struct kvm_memory_slot old, new; | |
bc6678a3 | 707 | struct kvm_memslots *slots, *old_memslots; |
6aa8b732 AK |
708 | |
709 | r = -EINVAL; | |
710 | /* General sanity checks */ | |
711 | if (mem->memory_size & (PAGE_SIZE - 1)) | |
712 | goto out; | |
713 | if (mem->guest_phys_addr & (PAGE_SIZE - 1)) | |
714 | goto out; | |
fa3d315a TY |
715 | /* We can read the guest memory with __xxx_user() later on. */ |
716 | if (user_alloc && | |
717 | ((mem->userspace_addr & (PAGE_SIZE - 1)) || | |
9e3bb6b6 HC |
718 | !access_ok(VERIFY_WRITE, |
719 | (void __user *)(unsigned long)mem->userspace_addr, | |
720 | mem->memory_size))) | |
78749809 | 721 | goto out; |
93a5cef0 | 722 | if (mem->slot >= KVM_MEM_SLOTS_NUM) |
6aa8b732 AK |
723 | goto out; |
724 | if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr) | |
725 | goto out; | |
726 | ||
28a37544 | 727 | memslot = id_to_memslot(kvm->memslots, mem->slot); |
6aa8b732 AK |
728 | base_gfn = mem->guest_phys_addr >> PAGE_SHIFT; |
729 | npages = mem->memory_size >> PAGE_SHIFT; | |
730 | ||
660c22c4 TY |
731 | r = -EINVAL; |
732 | if (npages > KVM_MEM_MAX_NR_PAGES) | |
733 | goto out; | |
734 | ||
6aa8b732 AK |
735 | if (!npages) |
736 | mem->flags &= ~KVM_MEM_LOG_DIRTY_PAGES; | |
737 | ||
6aa8b732 AK |
738 | new = old = *memslot; |
739 | ||
e36d96f7 | 740 | new.id = mem->slot; |
6aa8b732 AK |
741 | new.base_gfn = base_gfn; |
742 | new.npages = npages; | |
743 | new.flags = mem->flags; | |
744 | ||
745 | /* Disallow changing a memory slot's size. */ | |
746 | r = -EINVAL; | |
747 | if (npages && old.npages && npages != old.npages) | |
f78e0e2e | 748 | goto out_free; |
6aa8b732 AK |
749 | |
750 | /* Check for overlaps */ | |
751 | r = -EEXIST; | |
752 | for (i = 0; i < KVM_MEMORY_SLOTS; ++i) { | |
46a26bf5 | 753 | struct kvm_memory_slot *s = &kvm->memslots->memslots[i]; |
6aa8b732 | 754 | |
4cd481f6 | 755 | if (s == memslot || !s->npages) |
6aa8b732 AK |
756 | continue; |
757 | if (!((base_gfn + npages <= s->base_gfn) || | |
758 | (base_gfn >= s->base_gfn + s->npages))) | |
f78e0e2e | 759 | goto out_free; |
6aa8b732 | 760 | } |
6aa8b732 | 761 | |
6aa8b732 AK |
762 | /* Free page dirty bitmap if unneeded */ |
763 | if (!(new.flags & KVM_MEM_LOG_DIRTY_PAGES)) | |
8b6d44c7 | 764 | new.dirty_bitmap = NULL; |
6aa8b732 AK |
765 | |
766 | r = -ENOMEM; | |
767 | ||
768 | /* Allocate if a slot is being created */ | |
189a2f7b TY |
769 | if (npages && !old.npages) { |
770 | new.user_alloc = user_alloc; | |
771 | new.userspace_addr = mem->userspace_addr; | |
eff0114a | 772 | #ifndef CONFIG_S390 |
26535037 | 773 | new.rmap = vzalloc(npages * sizeof(*new.rmap)); |
290fc38d | 774 | if (!new.rmap) |
f78e0e2e | 775 | goto out_free; |
189a2f7b | 776 | #endif /* not defined CONFIG_S390 */ |
db3fe4eb TY |
777 | if (kvm_arch_create_memslot(&new, npages)) |
778 | goto out_free; | |
6aa8b732 | 779 | } |
ec04b260 | 780 | |
6aa8b732 AK |
781 | /* Allocate page dirty bitmap if needed */ |
782 | if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) { | |
a36a57b1 | 783 | if (kvm_create_dirty_bitmap(&new) < 0) |
f78e0e2e | 784 | goto out_free; |
bc6678a3 | 785 | /* destroy any largepage mappings for dirty tracking */ |
6aa8b732 AK |
786 | } |
787 | ||
bc6678a3 | 788 | if (!npages) { |
28a37544 XG |
789 | struct kvm_memory_slot *slot; |
790 | ||
bc6678a3 | 791 | r = -ENOMEM; |
6da64fdb TM |
792 | slots = kmemdup(kvm->memslots, sizeof(struct kvm_memslots), |
793 | GFP_KERNEL); | |
bc6678a3 MT |
794 | if (!slots) |
795 | goto out_free; | |
28a37544 XG |
796 | slot = id_to_memslot(slots, mem->slot); |
797 | slot->flags |= KVM_MEMSLOT_INVALID; | |
798 | ||
be593d62 | 799 | update_memslots(slots, NULL); |
bc6678a3 MT |
800 | |
801 | old_memslots = kvm->memslots; | |
802 | rcu_assign_pointer(kvm->memslots, slots); | |
803 | synchronize_srcu_expedited(&kvm->srcu); | |
804 | /* From this point no new shadow pages pointing to a deleted | |
805 | * memslot will be created. | |
806 | * | |
807 | * validation of sp->gfn happens in: | |
808 | * - gfn_to_hva (kvm_read_guest, gfn_to_pfn) | |
809 | * - kvm_is_visible_gfn (mmu_check_roots) | |
810 | */ | |
34d4cb8f | 811 | kvm_arch_flush_shadow(kvm); |
bc6678a3 MT |
812 | kfree(old_memslots); |
813 | } | |
34d4cb8f | 814 | |
f7784b8e MT |
815 | r = kvm_arch_prepare_memory_region(kvm, &new, old, mem, user_alloc); |
816 | if (r) | |
817 | goto out_free; | |
818 | ||
32f6daad | 819 | /* map/unmap the pages in iommu page table */ |
bc6678a3 MT |
820 | if (npages) { |
821 | r = kvm_iommu_map_pages(kvm, &new); | |
822 | if (r) | |
823 | goto out_free; | |
32f6daad AW |
824 | } else |
825 | kvm_iommu_unmap_pages(kvm, &old); | |
604b38ac | 826 | |
bc6678a3 | 827 | r = -ENOMEM; |
6da64fdb TM |
828 | slots = kmemdup(kvm->memslots, sizeof(struct kvm_memslots), |
829 | GFP_KERNEL); | |
bc6678a3 MT |
830 | if (!slots) |
831 | goto out_free; | |
bc6678a3 MT |
832 | |
833 | /* actual memory is freed via old in kvm_free_physmem_slot below */ | |
834 | if (!npages) { | |
835 | new.rmap = NULL; | |
836 | new.dirty_bitmap = NULL; | |
db3fe4eb | 837 | memset(&new.arch, 0, sizeof(new.arch)); |
bc6678a3 MT |
838 | } |
839 | ||
be593d62 | 840 | update_memslots(slots, &new); |
bc6678a3 MT |
841 | old_memslots = kvm->memslots; |
842 | rcu_assign_pointer(kvm->memslots, slots); | |
843 | synchronize_srcu_expedited(&kvm->srcu); | |
3ad82a7e | 844 | |
f7784b8e | 845 | kvm_arch_commit_memory_region(kvm, mem, old, user_alloc); |
82ce2c96 | 846 | |
ce88decf XG |
847 | /* |
848 | * If the new memory slot is created, we need to clear all | |
849 | * mmio sptes. | |
850 | */ | |
851 | if (npages && old.base_gfn != mem->guest_phys_addr >> PAGE_SHIFT) | |
852 | kvm_arch_flush_shadow(kvm); | |
853 | ||
bc6678a3 MT |
854 | kvm_free_physmem_slot(&old, &new); |
855 | kfree(old_memslots); | |
856 | ||
6aa8b732 AK |
857 | return 0; |
858 | ||
f78e0e2e | 859 | out_free: |
6aa8b732 AK |
860 | kvm_free_physmem_slot(&new, &old); |
861 | out: | |
862 | return r; | |
210c7c4d IE |
863 | |
864 | } | |
f78e0e2e SY |
865 | EXPORT_SYMBOL_GPL(__kvm_set_memory_region); |
866 | ||
867 | int kvm_set_memory_region(struct kvm *kvm, | |
868 | struct kvm_userspace_memory_region *mem, | |
869 | int user_alloc) | |
870 | { | |
871 | int r; | |
872 | ||
79fac95e | 873 | mutex_lock(&kvm->slots_lock); |
f78e0e2e | 874 | r = __kvm_set_memory_region(kvm, mem, user_alloc); |
79fac95e | 875 | mutex_unlock(&kvm->slots_lock); |
f78e0e2e SY |
876 | return r; |
877 | } | |
210c7c4d IE |
878 | EXPORT_SYMBOL_GPL(kvm_set_memory_region); |
879 | ||
1fe779f8 CO |
880 | int kvm_vm_ioctl_set_memory_region(struct kvm *kvm, |
881 | struct | |
882 | kvm_userspace_memory_region *mem, | |
883 | int user_alloc) | |
210c7c4d | 884 | { |
e0d62c7f IE |
885 | if (mem->slot >= KVM_MEMORY_SLOTS) |
886 | return -EINVAL; | |
210c7c4d | 887 | return kvm_set_memory_region(kvm, mem, user_alloc); |
6aa8b732 AK |
888 | } |
889 | ||
5bb064dc ZX |
890 | int kvm_get_dirty_log(struct kvm *kvm, |
891 | struct kvm_dirty_log *log, int *is_dirty) | |
6aa8b732 AK |
892 | { |
893 | struct kvm_memory_slot *memslot; | |
894 | int r, i; | |
87bf6e7d | 895 | unsigned long n; |
6aa8b732 AK |
896 | unsigned long any = 0; |
897 | ||
6aa8b732 AK |
898 | r = -EINVAL; |
899 | if (log->slot >= KVM_MEMORY_SLOTS) | |
900 | goto out; | |
901 | ||
28a37544 | 902 | memslot = id_to_memslot(kvm->memslots, log->slot); |
6aa8b732 AK |
903 | r = -ENOENT; |
904 | if (!memslot->dirty_bitmap) | |
905 | goto out; | |
906 | ||
87bf6e7d | 907 | n = kvm_dirty_bitmap_bytes(memslot); |
6aa8b732 | 908 | |
cd1a4a98 | 909 | for (i = 0; !any && i < n/sizeof(long); ++i) |
6aa8b732 AK |
910 | any = memslot->dirty_bitmap[i]; |
911 | ||
912 | r = -EFAULT; | |
913 | if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n)) | |
914 | goto out; | |
915 | ||
5bb064dc ZX |
916 | if (any) |
917 | *is_dirty = 1; | |
6aa8b732 AK |
918 | |
919 | r = 0; | |
6aa8b732 | 920 | out: |
6aa8b732 AK |
921 | return r; |
922 | } | |
923 | ||
db3fe4eb TY |
924 | bool kvm_largepages_enabled(void) |
925 | { | |
926 | return largepages_enabled; | |
927 | } | |
928 | ||
54dee993 MT |
929 | void kvm_disable_largepages(void) |
930 | { | |
931 | largepages_enabled = false; | |
932 | } | |
933 | EXPORT_SYMBOL_GPL(kvm_disable_largepages); | |
934 | ||
cea7bb21 IE |
935 | int is_error_page(struct page *page) |
936 | { | |
edba23e5 | 937 | return page == bad_page || page == hwpoison_page || page == fault_page; |
cea7bb21 IE |
938 | } |
939 | EXPORT_SYMBOL_GPL(is_error_page); | |
940 | ||
35149e21 AL |
941 | int is_error_pfn(pfn_t pfn) |
942 | { | |
edba23e5 | 943 | return pfn == bad_pfn || pfn == hwpoison_pfn || pfn == fault_pfn; |
35149e21 AL |
944 | } |
945 | EXPORT_SYMBOL_GPL(is_error_pfn); | |
946 | ||
bf998156 HY |
947 | int is_hwpoison_pfn(pfn_t pfn) |
948 | { | |
949 | return pfn == hwpoison_pfn; | |
950 | } | |
951 | EXPORT_SYMBOL_GPL(is_hwpoison_pfn); | |
952 | ||
edba23e5 GN |
953 | int is_fault_pfn(pfn_t pfn) |
954 | { | |
955 | return pfn == fault_pfn; | |
956 | } | |
957 | EXPORT_SYMBOL_GPL(is_fault_pfn); | |
958 | ||
fce92dce XG |
959 | int is_noslot_pfn(pfn_t pfn) |
960 | { | |
961 | return pfn == bad_pfn; | |
962 | } | |
963 | EXPORT_SYMBOL_GPL(is_noslot_pfn); | |
964 | ||
965 | int is_invalid_pfn(pfn_t pfn) | |
966 | { | |
967 | return pfn == hwpoison_pfn || pfn == fault_pfn; | |
968 | } | |
969 | EXPORT_SYMBOL_GPL(is_invalid_pfn); | |
970 | ||
f9d46eb0 IE |
971 | static inline unsigned long bad_hva(void) |
972 | { | |
973 | return PAGE_OFFSET; | |
974 | } | |
975 | ||
976 | int kvm_is_error_hva(unsigned long addr) | |
977 | { | |
978 | return addr == bad_hva(); | |
979 | } | |
980 | EXPORT_SYMBOL_GPL(kvm_is_error_hva); | |
981 | ||
49c7754c GN |
982 | struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn) |
983 | { | |
984 | return __gfn_to_memslot(kvm_memslots(kvm), gfn); | |
985 | } | |
a1f4d395 | 986 | EXPORT_SYMBOL_GPL(gfn_to_memslot); |
6aa8b732 | 987 | |
e0d62c7f IE |
988 | int kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn) |
989 | { | |
bf3e05bc | 990 | struct kvm_memory_slot *memslot = gfn_to_memslot(kvm, gfn); |
e0d62c7f | 991 | |
bf3e05bc XG |
992 | if (!memslot || memslot->id >= KVM_MEMORY_SLOTS || |
993 | memslot->flags & KVM_MEMSLOT_INVALID) | |
994 | return 0; | |
e0d62c7f | 995 | |
bf3e05bc | 996 | return 1; |
e0d62c7f IE |
997 | } |
998 | EXPORT_SYMBOL_GPL(kvm_is_visible_gfn); | |
999 | ||
8f0b1ab6 JR |
1000 | unsigned long kvm_host_page_size(struct kvm *kvm, gfn_t gfn) |
1001 | { | |
1002 | struct vm_area_struct *vma; | |
1003 | unsigned long addr, size; | |
1004 | ||
1005 | size = PAGE_SIZE; | |
1006 | ||
1007 | addr = gfn_to_hva(kvm, gfn); | |
1008 | if (kvm_is_error_hva(addr)) | |
1009 | return PAGE_SIZE; | |
1010 | ||
1011 | down_read(¤t->mm->mmap_sem); | |
1012 | vma = find_vma(current->mm, addr); | |
1013 | if (!vma) | |
1014 | goto out; | |
1015 | ||
1016 | size = vma_kernel_pagesize(vma); | |
1017 | ||
1018 | out: | |
1019 | up_read(¤t->mm->mmap_sem); | |
1020 | ||
1021 | return size; | |
1022 | } | |
1023 | ||
49c7754c | 1024 | static unsigned long gfn_to_hva_many(struct kvm_memory_slot *slot, gfn_t gfn, |
48987781 | 1025 | gfn_t *nr_pages) |
539cb660 | 1026 | { |
bc6678a3 | 1027 | if (!slot || slot->flags & KVM_MEMSLOT_INVALID) |
539cb660 | 1028 | return bad_hva(); |
48987781 XG |
1029 | |
1030 | if (nr_pages) | |
1031 | *nr_pages = slot->npages - (gfn - slot->base_gfn); | |
1032 | ||
f5c98031 | 1033 | return gfn_to_hva_memslot(slot, gfn); |
539cb660 | 1034 | } |
48987781 XG |
1035 | |
1036 | unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn) | |
1037 | { | |
49c7754c | 1038 | return gfn_to_hva_many(gfn_to_memslot(kvm, gfn), gfn, NULL); |
48987781 | 1039 | } |
0d150298 | 1040 | EXPORT_SYMBOL_GPL(gfn_to_hva); |
539cb660 | 1041 | |
8030089f GN |
1042 | static pfn_t get_fault_pfn(void) |
1043 | { | |
1044 | get_page(fault_page); | |
1045 | return fault_pfn; | |
1046 | } | |
1047 | ||
0857b9e9 GN |
1048 | int get_user_page_nowait(struct task_struct *tsk, struct mm_struct *mm, |
1049 | unsigned long start, int write, struct page **page) | |
1050 | { | |
1051 | int flags = FOLL_TOUCH | FOLL_NOWAIT | FOLL_HWPOISON | FOLL_GET; | |
1052 | ||
1053 | if (write) | |
1054 | flags |= FOLL_WRITE; | |
1055 | ||
1056 | return __get_user_pages(tsk, mm, start, 1, flags, page, NULL, NULL); | |
1057 | } | |
1058 | ||
fafc3dba HY |
1059 | static inline int check_user_page_hwpoison(unsigned long addr) |
1060 | { | |
1061 | int rc, flags = FOLL_TOUCH | FOLL_HWPOISON | FOLL_WRITE; | |
1062 | ||
1063 | rc = __get_user_pages(current, current->mm, addr, 1, | |
1064 | flags, NULL, NULL, NULL); | |
1065 | return rc == -EHWPOISON; | |
1066 | } | |
1067 | ||
af585b92 | 1068 | static pfn_t hva_to_pfn(struct kvm *kvm, unsigned long addr, bool atomic, |
612819c3 | 1069 | bool *async, bool write_fault, bool *writable) |
954bbbc2 | 1070 | { |
8d4e1288 | 1071 | struct page *page[1]; |
af585b92 | 1072 | int npages = 0; |
2e2e3738 | 1073 | pfn_t pfn; |
954bbbc2 | 1074 | |
af585b92 GN |
1075 | /* we can do it either atomically or asynchronously, not both */ |
1076 | BUG_ON(atomic && async); | |
1077 | ||
612819c3 MT |
1078 | BUG_ON(!write_fault && !writable); |
1079 | ||
1080 | if (writable) | |
1081 | *writable = true; | |
1082 | ||
af585b92 | 1083 | if (atomic || async) |
887c08ac | 1084 | npages = __get_user_pages_fast(addr, 1, 1, page); |
af585b92 GN |
1085 | |
1086 | if (unlikely(npages != 1) && !atomic) { | |
887c08ac | 1087 | might_sleep(); |
612819c3 MT |
1088 | |
1089 | if (writable) | |
1090 | *writable = write_fault; | |
1091 | ||
0857b9e9 GN |
1092 | if (async) { |
1093 | down_read(¤t->mm->mmap_sem); | |
1094 | npages = get_user_page_nowait(current, current->mm, | |
1095 | addr, write_fault, page); | |
1096 | up_read(¤t->mm->mmap_sem); | |
1097 | } else | |
1098 | npages = get_user_pages_fast(addr, 1, write_fault, | |
1099 | page); | |
612819c3 MT |
1100 | |
1101 | /* map read fault as writable if possible */ | |
1102 | if (unlikely(!write_fault) && npages == 1) { | |
1103 | struct page *wpage[1]; | |
1104 | ||
1105 | npages = __get_user_pages_fast(addr, 1, 1, wpage); | |
1106 | if (npages == 1) { | |
1107 | *writable = true; | |
1108 | put_page(page[0]); | |
1109 | page[0] = wpage[0]; | |
1110 | } | |
1111 | npages = 1; | |
1112 | } | |
887c08ac | 1113 | } |
539cb660 | 1114 | |
2e2e3738 AL |
1115 | if (unlikely(npages != 1)) { |
1116 | struct vm_area_struct *vma; | |
1117 | ||
887c08ac | 1118 | if (atomic) |
8030089f | 1119 | return get_fault_pfn(); |
887c08ac | 1120 | |
bbeb3406 | 1121 | down_read(¤t->mm->mmap_sem); |
0857b9e9 GN |
1122 | if (npages == -EHWPOISON || |
1123 | (!async && check_user_page_hwpoison(addr))) { | |
bbeb3406 | 1124 | up_read(¤t->mm->mmap_sem); |
bf998156 HY |
1125 | get_page(hwpoison_page); |
1126 | return page_to_pfn(hwpoison_page); | |
1127 | } | |
1128 | ||
8030089f | 1129 | vma = find_vma_intersection(current->mm, addr, addr+1); |
4c2155ce | 1130 | |
8030089f GN |
1131 | if (vma == NULL) |
1132 | pfn = get_fault_pfn(); | |
1133 | else if ((vma->vm_flags & VM_PFNMAP)) { | |
1134 | pfn = ((addr - vma->vm_start) >> PAGE_SHIFT) + | |
1135 | vma->vm_pgoff; | |
1136 | BUG_ON(!kvm_is_mmio_pfn(pfn)); | |
1137 | } else { | |
1138 | if (async && (vma->vm_flags & VM_WRITE)) | |
af585b92 | 1139 | *async = true; |
8030089f | 1140 | pfn = get_fault_pfn(); |
2e2e3738 | 1141 | } |
4c2155ce | 1142 | up_read(¤t->mm->mmap_sem); |
2e2e3738 AL |
1143 | } else |
1144 | pfn = page_to_pfn(page[0]); | |
8d4e1288 | 1145 | |
2e2e3738 | 1146 | return pfn; |
35149e21 AL |
1147 | } |
1148 | ||
887c08ac XG |
1149 | pfn_t hva_to_pfn_atomic(struct kvm *kvm, unsigned long addr) |
1150 | { | |
612819c3 | 1151 | return hva_to_pfn(kvm, addr, true, NULL, true, NULL); |
887c08ac XG |
1152 | } |
1153 | EXPORT_SYMBOL_GPL(hva_to_pfn_atomic); | |
1154 | ||
612819c3 MT |
1155 | static pfn_t __gfn_to_pfn(struct kvm *kvm, gfn_t gfn, bool atomic, bool *async, |
1156 | bool write_fault, bool *writable) | |
506f0d6f MT |
1157 | { |
1158 | unsigned long addr; | |
1159 | ||
af585b92 GN |
1160 | if (async) |
1161 | *async = false; | |
1162 | ||
506f0d6f MT |
1163 | addr = gfn_to_hva(kvm, gfn); |
1164 | if (kvm_is_error_hva(addr)) { | |
1165 | get_page(bad_page); | |
1166 | return page_to_pfn(bad_page); | |
1167 | } | |
1168 | ||
612819c3 | 1169 | return hva_to_pfn(kvm, addr, atomic, async, write_fault, writable); |
365fb3fd XG |
1170 | } |
1171 | ||
1172 | pfn_t gfn_to_pfn_atomic(struct kvm *kvm, gfn_t gfn) | |
1173 | { | |
612819c3 | 1174 | return __gfn_to_pfn(kvm, gfn, true, NULL, true, NULL); |
365fb3fd XG |
1175 | } |
1176 | EXPORT_SYMBOL_GPL(gfn_to_pfn_atomic); | |
1177 | ||
612819c3 MT |
1178 | pfn_t gfn_to_pfn_async(struct kvm *kvm, gfn_t gfn, bool *async, |
1179 | bool write_fault, bool *writable) | |
af585b92 | 1180 | { |
612819c3 | 1181 | return __gfn_to_pfn(kvm, gfn, false, async, write_fault, writable); |
af585b92 GN |
1182 | } |
1183 | EXPORT_SYMBOL_GPL(gfn_to_pfn_async); | |
1184 | ||
365fb3fd XG |
1185 | pfn_t gfn_to_pfn(struct kvm *kvm, gfn_t gfn) |
1186 | { | |
612819c3 | 1187 | return __gfn_to_pfn(kvm, gfn, false, NULL, true, NULL); |
506f0d6f | 1188 | } |
35149e21 AL |
1189 | EXPORT_SYMBOL_GPL(gfn_to_pfn); |
1190 | ||
612819c3 MT |
1191 | pfn_t gfn_to_pfn_prot(struct kvm *kvm, gfn_t gfn, bool write_fault, |
1192 | bool *writable) | |
1193 | { | |
1194 | return __gfn_to_pfn(kvm, gfn, false, NULL, write_fault, writable); | |
1195 | } | |
1196 | EXPORT_SYMBOL_GPL(gfn_to_pfn_prot); | |
1197 | ||
506f0d6f MT |
1198 | pfn_t gfn_to_pfn_memslot(struct kvm *kvm, |
1199 | struct kvm_memory_slot *slot, gfn_t gfn) | |
1200 | { | |
1201 | unsigned long addr = gfn_to_hva_memslot(slot, gfn); | |
612819c3 | 1202 | return hva_to_pfn(kvm, addr, false, NULL, true, NULL); |
506f0d6f MT |
1203 | } |
1204 | ||
48987781 XG |
1205 | int gfn_to_page_many_atomic(struct kvm *kvm, gfn_t gfn, struct page **pages, |
1206 | int nr_pages) | |
1207 | { | |
1208 | unsigned long addr; | |
1209 | gfn_t entry; | |
1210 | ||
49c7754c | 1211 | addr = gfn_to_hva_many(gfn_to_memslot(kvm, gfn), gfn, &entry); |
48987781 XG |
1212 | if (kvm_is_error_hva(addr)) |
1213 | return -1; | |
1214 | ||
1215 | if (entry < nr_pages) | |
1216 | return 0; | |
1217 | ||
1218 | return __get_user_pages_fast(addr, nr_pages, 1, pages); | |
1219 | } | |
1220 | EXPORT_SYMBOL_GPL(gfn_to_page_many_atomic); | |
1221 | ||
35149e21 AL |
1222 | struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn) |
1223 | { | |
2e2e3738 AL |
1224 | pfn_t pfn; |
1225 | ||
1226 | pfn = gfn_to_pfn(kvm, gfn); | |
c77fb9dc | 1227 | if (!kvm_is_mmio_pfn(pfn)) |
2e2e3738 AL |
1228 | return pfn_to_page(pfn); |
1229 | ||
c77fb9dc | 1230 | WARN_ON(kvm_is_mmio_pfn(pfn)); |
2e2e3738 AL |
1231 | |
1232 | get_page(bad_page); | |
1233 | return bad_page; | |
954bbbc2 | 1234 | } |
aab61cc0 | 1235 | |
954bbbc2 AK |
1236 | EXPORT_SYMBOL_GPL(gfn_to_page); |
1237 | ||
b4231d61 IE |
1238 | void kvm_release_page_clean(struct page *page) |
1239 | { | |
35149e21 | 1240 | kvm_release_pfn_clean(page_to_pfn(page)); |
b4231d61 IE |
1241 | } |
1242 | EXPORT_SYMBOL_GPL(kvm_release_page_clean); | |
1243 | ||
35149e21 AL |
1244 | void kvm_release_pfn_clean(pfn_t pfn) |
1245 | { | |
c77fb9dc | 1246 | if (!kvm_is_mmio_pfn(pfn)) |
2e2e3738 | 1247 | put_page(pfn_to_page(pfn)); |
35149e21 AL |
1248 | } |
1249 | EXPORT_SYMBOL_GPL(kvm_release_pfn_clean); | |
1250 | ||
b4231d61 | 1251 | void kvm_release_page_dirty(struct page *page) |
8a7ae055 | 1252 | { |
35149e21 AL |
1253 | kvm_release_pfn_dirty(page_to_pfn(page)); |
1254 | } | |
1255 | EXPORT_SYMBOL_GPL(kvm_release_page_dirty); | |
1256 | ||
1257 | void kvm_release_pfn_dirty(pfn_t pfn) | |
1258 | { | |
1259 | kvm_set_pfn_dirty(pfn); | |
1260 | kvm_release_pfn_clean(pfn); | |
1261 | } | |
1262 | EXPORT_SYMBOL_GPL(kvm_release_pfn_dirty); | |
1263 | ||
1264 | void kvm_set_page_dirty(struct page *page) | |
1265 | { | |
1266 | kvm_set_pfn_dirty(page_to_pfn(page)); | |
1267 | } | |
1268 | EXPORT_SYMBOL_GPL(kvm_set_page_dirty); | |
1269 | ||
1270 | void kvm_set_pfn_dirty(pfn_t pfn) | |
1271 | { | |
c77fb9dc | 1272 | if (!kvm_is_mmio_pfn(pfn)) { |
2e2e3738 AL |
1273 | struct page *page = pfn_to_page(pfn); |
1274 | if (!PageReserved(page)) | |
1275 | SetPageDirty(page); | |
1276 | } | |
8a7ae055 | 1277 | } |
35149e21 AL |
1278 | EXPORT_SYMBOL_GPL(kvm_set_pfn_dirty); |
1279 | ||
1280 | void kvm_set_pfn_accessed(pfn_t pfn) | |
1281 | { | |
c77fb9dc | 1282 | if (!kvm_is_mmio_pfn(pfn)) |
2e2e3738 | 1283 | mark_page_accessed(pfn_to_page(pfn)); |
35149e21 AL |
1284 | } |
1285 | EXPORT_SYMBOL_GPL(kvm_set_pfn_accessed); | |
1286 | ||
1287 | void kvm_get_pfn(pfn_t pfn) | |
1288 | { | |
c77fb9dc | 1289 | if (!kvm_is_mmio_pfn(pfn)) |
2e2e3738 | 1290 | get_page(pfn_to_page(pfn)); |
35149e21 AL |
1291 | } |
1292 | EXPORT_SYMBOL_GPL(kvm_get_pfn); | |
8a7ae055 | 1293 | |
195aefde IE |
1294 | static int next_segment(unsigned long len, int offset) |
1295 | { | |
1296 | if (len > PAGE_SIZE - offset) | |
1297 | return PAGE_SIZE - offset; | |
1298 | else | |
1299 | return len; | |
1300 | } | |
1301 | ||
1302 | int kvm_read_guest_page(struct kvm *kvm, gfn_t gfn, void *data, int offset, | |
1303 | int len) | |
1304 | { | |
e0506bcb IE |
1305 | int r; |
1306 | unsigned long addr; | |
195aefde | 1307 | |
e0506bcb IE |
1308 | addr = gfn_to_hva(kvm, gfn); |
1309 | if (kvm_is_error_hva(addr)) | |
1310 | return -EFAULT; | |
fa3d315a | 1311 | r = __copy_from_user(data, (void __user *)addr + offset, len); |
e0506bcb | 1312 | if (r) |
195aefde | 1313 | return -EFAULT; |
195aefde IE |
1314 | return 0; |
1315 | } | |
1316 | EXPORT_SYMBOL_GPL(kvm_read_guest_page); | |
1317 | ||
1318 | int kvm_read_guest(struct kvm *kvm, gpa_t gpa, void *data, unsigned long len) | |
1319 | { | |
1320 | gfn_t gfn = gpa >> PAGE_SHIFT; | |
1321 | int seg; | |
1322 | int offset = offset_in_page(gpa); | |
1323 | int ret; | |
1324 | ||
1325 | while ((seg = next_segment(len, offset)) != 0) { | |
1326 | ret = kvm_read_guest_page(kvm, gfn, data, offset, seg); | |
1327 | if (ret < 0) | |
1328 | return ret; | |
1329 | offset = 0; | |
1330 | len -= seg; | |
1331 | data += seg; | |
1332 | ++gfn; | |
1333 | } | |
1334 | return 0; | |
1335 | } | |
1336 | EXPORT_SYMBOL_GPL(kvm_read_guest); | |
1337 | ||
7ec54588 MT |
1338 | int kvm_read_guest_atomic(struct kvm *kvm, gpa_t gpa, void *data, |
1339 | unsigned long len) | |
1340 | { | |
1341 | int r; | |
1342 | unsigned long addr; | |
1343 | gfn_t gfn = gpa >> PAGE_SHIFT; | |
1344 | int offset = offset_in_page(gpa); | |
1345 | ||
1346 | addr = gfn_to_hva(kvm, gfn); | |
1347 | if (kvm_is_error_hva(addr)) | |
1348 | return -EFAULT; | |
0aac03f0 | 1349 | pagefault_disable(); |
7ec54588 | 1350 | r = __copy_from_user_inatomic(data, (void __user *)addr + offset, len); |
0aac03f0 | 1351 | pagefault_enable(); |
7ec54588 MT |
1352 | if (r) |
1353 | return -EFAULT; | |
1354 | return 0; | |
1355 | } | |
1356 | EXPORT_SYMBOL(kvm_read_guest_atomic); | |
1357 | ||
195aefde IE |
1358 | int kvm_write_guest_page(struct kvm *kvm, gfn_t gfn, const void *data, |
1359 | int offset, int len) | |
1360 | { | |
e0506bcb IE |
1361 | int r; |
1362 | unsigned long addr; | |
195aefde | 1363 | |
e0506bcb IE |
1364 | addr = gfn_to_hva(kvm, gfn); |
1365 | if (kvm_is_error_hva(addr)) | |
1366 | return -EFAULT; | |
8b0cedff | 1367 | r = __copy_to_user((void __user *)addr + offset, data, len); |
e0506bcb | 1368 | if (r) |
195aefde | 1369 | return -EFAULT; |
195aefde IE |
1370 | mark_page_dirty(kvm, gfn); |
1371 | return 0; | |
1372 | } | |
1373 | EXPORT_SYMBOL_GPL(kvm_write_guest_page); | |
1374 | ||
1375 | int kvm_write_guest(struct kvm *kvm, gpa_t gpa, const void *data, | |
1376 | unsigned long len) | |
1377 | { | |
1378 | gfn_t gfn = gpa >> PAGE_SHIFT; | |
1379 | int seg; | |
1380 | int offset = offset_in_page(gpa); | |
1381 | int ret; | |
1382 | ||
1383 | while ((seg = next_segment(len, offset)) != 0) { | |
1384 | ret = kvm_write_guest_page(kvm, gfn, data, offset, seg); | |
1385 | if (ret < 0) | |
1386 | return ret; | |
1387 | offset = 0; | |
1388 | len -= seg; | |
1389 | data += seg; | |
1390 | ++gfn; | |
1391 | } | |
1392 | return 0; | |
1393 | } | |
1394 | ||
49c7754c GN |
1395 | int kvm_gfn_to_hva_cache_init(struct kvm *kvm, struct gfn_to_hva_cache *ghc, |
1396 | gpa_t gpa) | |
1397 | { | |
1398 | struct kvm_memslots *slots = kvm_memslots(kvm); | |
1399 | int offset = offset_in_page(gpa); | |
1400 | gfn_t gfn = gpa >> PAGE_SHIFT; | |
1401 | ||
1402 | ghc->gpa = gpa; | |
1403 | ghc->generation = slots->generation; | |
9d4cba7f | 1404 | ghc->memslot = gfn_to_memslot(kvm, gfn); |
49c7754c GN |
1405 | ghc->hva = gfn_to_hva_many(ghc->memslot, gfn, NULL); |
1406 | if (!kvm_is_error_hva(ghc->hva)) | |
1407 | ghc->hva += offset; | |
1408 | else | |
1409 | return -EFAULT; | |
1410 | ||
1411 | return 0; | |
1412 | } | |
1413 | EXPORT_SYMBOL_GPL(kvm_gfn_to_hva_cache_init); | |
1414 | ||
1415 | int kvm_write_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc, | |
1416 | void *data, unsigned long len) | |
1417 | { | |
1418 | struct kvm_memslots *slots = kvm_memslots(kvm); | |
1419 | int r; | |
1420 | ||
1421 | if (slots->generation != ghc->generation) | |
1422 | kvm_gfn_to_hva_cache_init(kvm, ghc, ghc->gpa); | |
1423 | ||
1424 | if (kvm_is_error_hva(ghc->hva)) | |
1425 | return -EFAULT; | |
1426 | ||
8b0cedff | 1427 | r = __copy_to_user((void __user *)ghc->hva, data, len); |
49c7754c GN |
1428 | if (r) |
1429 | return -EFAULT; | |
1430 | mark_page_dirty_in_slot(kvm, ghc->memslot, ghc->gpa >> PAGE_SHIFT); | |
1431 | ||
1432 | return 0; | |
1433 | } | |
1434 | EXPORT_SYMBOL_GPL(kvm_write_guest_cached); | |
1435 | ||
e03b644f GN |
1436 | int kvm_read_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc, |
1437 | void *data, unsigned long len) | |
1438 | { | |
1439 | struct kvm_memslots *slots = kvm_memslots(kvm); | |
1440 | int r; | |
1441 | ||
1442 | if (slots->generation != ghc->generation) | |
1443 | kvm_gfn_to_hva_cache_init(kvm, ghc, ghc->gpa); | |
1444 | ||
1445 | if (kvm_is_error_hva(ghc->hva)) | |
1446 | return -EFAULT; | |
1447 | ||
1448 | r = __copy_from_user(data, (void __user *)ghc->hva, len); | |
1449 | if (r) | |
1450 | return -EFAULT; | |
1451 | ||
1452 | return 0; | |
1453 | } | |
1454 | EXPORT_SYMBOL_GPL(kvm_read_guest_cached); | |
1455 | ||
195aefde IE |
1456 | int kvm_clear_guest_page(struct kvm *kvm, gfn_t gfn, int offset, int len) |
1457 | { | |
3bcc8a8c HC |
1458 | return kvm_write_guest_page(kvm, gfn, (const void *) empty_zero_page, |
1459 | offset, len); | |
195aefde IE |
1460 | } |
1461 | EXPORT_SYMBOL_GPL(kvm_clear_guest_page); | |
1462 | ||
1463 | int kvm_clear_guest(struct kvm *kvm, gpa_t gpa, unsigned long len) | |
1464 | { | |
1465 | gfn_t gfn = gpa >> PAGE_SHIFT; | |
1466 | int seg; | |
1467 | int offset = offset_in_page(gpa); | |
1468 | int ret; | |
1469 | ||
1470 | while ((seg = next_segment(len, offset)) != 0) { | |
1471 | ret = kvm_clear_guest_page(kvm, gfn, offset, seg); | |
1472 | if (ret < 0) | |
1473 | return ret; | |
1474 | offset = 0; | |
1475 | len -= seg; | |
1476 | ++gfn; | |
1477 | } | |
1478 | return 0; | |
1479 | } | |
1480 | EXPORT_SYMBOL_GPL(kvm_clear_guest); | |
1481 | ||
49c7754c GN |
1482 | void mark_page_dirty_in_slot(struct kvm *kvm, struct kvm_memory_slot *memslot, |
1483 | gfn_t gfn) | |
6aa8b732 | 1484 | { |
7e9d619d RR |
1485 | if (memslot && memslot->dirty_bitmap) { |
1486 | unsigned long rel_gfn = gfn - memslot->base_gfn; | |
6aa8b732 | 1487 | |
93474b25 TY |
1488 | /* TODO: introduce set_bit_le() and use it */ |
1489 | test_and_set_bit_le(rel_gfn, memslot->dirty_bitmap); | |
6aa8b732 AK |
1490 | } |
1491 | } | |
1492 | ||
49c7754c GN |
1493 | void mark_page_dirty(struct kvm *kvm, gfn_t gfn) |
1494 | { | |
1495 | struct kvm_memory_slot *memslot; | |
1496 | ||
1497 | memslot = gfn_to_memslot(kvm, gfn); | |
1498 | mark_page_dirty_in_slot(kvm, memslot, gfn); | |
1499 | } | |
1500 | ||
b6958ce4 ED |
1501 | /* |
1502 | * The vCPU has executed a HLT instruction with in-kernel mode enabled. | |
1503 | */ | |
8776e519 | 1504 | void kvm_vcpu_block(struct kvm_vcpu *vcpu) |
d3bef15f | 1505 | { |
e5c239cf MT |
1506 | DEFINE_WAIT(wait); |
1507 | ||
1508 | for (;;) { | |
1509 | prepare_to_wait(&vcpu->wq, &wait, TASK_INTERRUPTIBLE); | |
1510 | ||
a1b37100 | 1511 | if (kvm_arch_vcpu_runnable(vcpu)) { |
a8eeb04a | 1512 | kvm_make_request(KVM_REQ_UNHALT, vcpu); |
e5c239cf | 1513 | break; |
d7690175 | 1514 | } |
09cec754 GN |
1515 | if (kvm_cpu_has_pending_timer(vcpu)) |
1516 | break; | |
e5c239cf MT |
1517 | if (signal_pending(current)) |
1518 | break; | |
1519 | ||
b6958ce4 | 1520 | schedule(); |
b6958ce4 | 1521 | } |
d3bef15f | 1522 | |
e5c239cf | 1523 | finish_wait(&vcpu->wq, &wait); |
b6958ce4 ED |
1524 | } |
1525 | ||
8c84780d | 1526 | #ifndef CONFIG_S390 |
b6d33834 CD |
1527 | /* |
1528 | * Kick a sleeping VCPU, or a guest VCPU in guest mode, into host kernel mode. | |
1529 | */ | |
1530 | void kvm_vcpu_kick(struct kvm_vcpu *vcpu) | |
1531 | { | |
1532 | int me; | |
1533 | int cpu = vcpu->cpu; | |
1534 | wait_queue_head_t *wqp; | |
1535 | ||
1536 | wqp = kvm_arch_vcpu_wq(vcpu); | |
1537 | if (waitqueue_active(wqp)) { | |
1538 | wake_up_interruptible(wqp); | |
1539 | ++vcpu->stat.halt_wakeup; | |
1540 | } | |
1541 | ||
1542 | me = get_cpu(); | |
1543 | if (cpu != me && (unsigned)cpu < nr_cpu_ids && cpu_online(cpu)) | |
1544 | if (kvm_arch_vcpu_should_kick(vcpu)) | |
1545 | smp_send_reschedule(cpu); | |
1546 | put_cpu(); | |
1547 | } | |
8c84780d | 1548 | #endif /* !CONFIG_S390 */ |
b6d33834 | 1549 | |
6aa8b732 AK |
1550 | void kvm_resched(struct kvm_vcpu *vcpu) |
1551 | { | |
3fca0365 YD |
1552 | if (!need_resched()) |
1553 | return; | |
6aa8b732 | 1554 | cond_resched(); |
6aa8b732 AK |
1555 | } |
1556 | EXPORT_SYMBOL_GPL(kvm_resched); | |
1557 | ||
41628d33 KW |
1558 | bool kvm_vcpu_yield_to(struct kvm_vcpu *target) |
1559 | { | |
1560 | struct pid *pid; | |
1561 | struct task_struct *task = NULL; | |
1562 | ||
1563 | rcu_read_lock(); | |
1564 | pid = rcu_dereference(target->pid); | |
1565 | if (pid) | |
1566 | task = get_pid_task(target->pid, PIDTYPE_PID); | |
1567 | rcu_read_unlock(); | |
1568 | if (!task) | |
1569 | return false; | |
1570 | if (task->flags & PF_VCPU) { | |
1571 | put_task_struct(task); | |
1572 | return false; | |
1573 | } | |
1574 | if (yield_to(task, 1)) { | |
1575 | put_task_struct(task); | |
1576 | return true; | |
1577 | } | |
1578 | put_task_struct(task); | |
1579 | return false; | |
1580 | } | |
1581 | EXPORT_SYMBOL_GPL(kvm_vcpu_yield_to); | |
1582 | ||
217ece61 | 1583 | void kvm_vcpu_on_spin(struct kvm_vcpu *me) |
d255f4f2 | 1584 | { |
217ece61 RR |
1585 | struct kvm *kvm = me->kvm; |
1586 | struct kvm_vcpu *vcpu; | |
1587 | int last_boosted_vcpu = me->kvm->last_boosted_vcpu; | |
1588 | int yielded = 0; | |
1589 | int pass; | |
1590 | int i; | |
d255f4f2 | 1591 | |
217ece61 RR |
1592 | /* |
1593 | * We boost the priority of a VCPU that is runnable but not | |
1594 | * currently running, because it got preempted by something | |
1595 | * else and called schedule in __vcpu_run. Hopefully that | |
1596 | * VCPU is holding the lock that we need and will release it. | |
1597 | * We approximate round-robin by starting at the last boosted VCPU. | |
1598 | */ | |
1599 | for (pass = 0; pass < 2 && !yielded; pass++) { | |
1600 | kvm_for_each_vcpu(i, vcpu, kvm) { | |
217ece61 RR |
1601 | if (!pass && i < last_boosted_vcpu) { |
1602 | i = last_boosted_vcpu; | |
1603 | continue; | |
1604 | } else if (pass && i > last_boosted_vcpu) | |
1605 | break; | |
1606 | if (vcpu == me) | |
1607 | continue; | |
1608 | if (waitqueue_active(&vcpu->wq)) | |
1609 | continue; | |
41628d33 | 1610 | if (kvm_vcpu_yield_to(vcpu)) { |
217ece61 RR |
1611 | kvm->last_boosted_vcpu = i; |
1612 | yielded = 1; | |
1613 | break; | |
1614 | } | |
217ece61 RR |
1615 | } |
1616 | } | |
d255f4f2 ZE |
1617 | } |
1618 | EXPORT_SYMBOL_GPL(kvm_vcpu_on_spin); | |
1619 | ||
e4a533a4 | 1620 | static int kvm_vcpu_fault(struct vm_area_struct *vma, struct vm_fault *vmf) |
9a2bb7f4 AK |
1621 | { |
1622 | struct kvm_vcpu *vcpu = vma->vm_file->private_data; | |
9a2bb7f4 AK |
1623 | struct page *page; |
1624 | ||
e4a533a4 | 1625 | if (vmf->pgoff == 0) |
039576c0 | 1626 | page = virt_to_page(vcpu->run); |
09566765 | 1627 | #ifdef CONFIG_X86 |
e4a533a4 | 1628 | else if (vmf->pgoff == KVM_PIO_PAGE_OFFSET) |
ad312c7c | 1629 | page = virt_to_page(vcpu->arch.pio_data); |
5f94c174 LV |
1630 | #endif |
1631 | #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET | |
1632 | else if (vmf->pgoff == KVM_COALESCED_MMIO_PAGE_OFFSET) | |
1633 | page = virt_to_page(vcpu->kvm->coalesced_mmio_ring); | |
09566765 | 1634 | #endif |
039576c0 | 1635 | else |
5b1c1493 | 1636 | return kvm_arch_vcpu_fault(vcpu, vmf); |
9a2bb7f4 | 1637 | get_page(page); |
e4a533a4 | 1638 | vmf->page = page; |
1639 | return 0; | |
9a2bb7f4 AK |
1640 | } |
1641 | ||
f0f37e2f | 1642 | static const struct vm_operations_struct kvm_vcpu_vm_ops = { |
e4a533a4 | 1643 | .fault = kvm_vcpu_fault, |
9a2bb7f4 AK |
1644 | }; |
1645 | ||
1646 | static int kvm_vcpu_mmap(struct file *file, struct vm_area_struct *vma) | |
1647 | { | |
1648 | vma->vm_ops = &kvm_vcpu_vm_ops; | |
1649 | return 0; | |
1650 | } | |
1651 | ||
bccf2150 AK |
1652 | static int kvm_vcpu_release(struct inode *inode, struct file *filp) |
1653 | { | |
1654 | struct kvm_vcpu *vcpu = filp->private_data; | |
1655 | ||
66c0b394 | 1656 | kvm_put_kvm(vcpu->kvm); |
bccf2150 AK |
1657 | return 0; |
1658 | } | |
1659 | ||
3d3aab1b | 1660 | static struct file_operations kvm_vcpu_fops = { |
bccf2150 AK |
1661 | .release = kvm_vcpu_release, |
1662 | .unlocked_ioctl = kvm_vcpu_ioctl, | |
1dda606c AG |
1663 | #ifdef CONFIG_COMPAT |
1664 | .compat_ioctl = kvm_vcpu_compat_ioctl, | |
1665 | #endif | |
9a2bb7f4 | 1666 | .mmap = kvm_vcpu_mmap, |
6038f373 | 1667 | .llseek = noop_llseek, |
bccf2150 AK |
1668 | }; |
1669 | ||
1670 | /* | |
1671 | * Allocates an inode for the vcpu. | |
1672 | */ | |
1673 | static int create_vcpu_fd(struct kvm_vcpu *vcpu) | |
1674 | { | |
628ff7c1 | 1675 | return anon_inode_getfd("kvm-vcpu", &kvm_vcpu_fops, vcpu, O_RDWR); |
bccf2150 AK |
1676 | } |
1677 | ||
c5ea7660 AK |
1678 | /* |
1679 | * Creates some virtual cpus. Good luck creating more than one. | |
1680 | */ | |
73880c80 | 1681 | static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, u32 id) |
c5ea7660 AK |
1682 | { |
1683 | int r; | |
988a2cae | 1684 | struct kvm_vcpu *vcpu, *v; |
c5ea7660 | 1685 | |
73880c80 | 1686 | vcpu = kvm_arch_vcpu_create(kvm, id); |
fb3f0f51 RR |
1687 | if (IS_ERR(vcpu)) |
1688 | return PTR_ERR(vcpu); | |
c5ea7660 | 1689 | |
15ad7146 AK |
1690 | preempt_notifier_init(&vcpu->preempt_notifier, &kvm_preempt_ops); |
1691 | ||
26e5215f AK |
1692 | r = kvm_arch_vcpu_setup(vcpu); |
1693 | if (r) | |
d780592b | 1694 | goto vcpu_destroy; |
26e5215f | 1695 | |
11ec2804 | 1696 | mutex_lock(&kvm->lock); |
3e515705 AK |
1697 | if (!kvm_vcpu_compatible(vcpu)) { |
1698 | r = -EINVAL; | |
1699 | goto unlock_vcpu_destroy; | |
1700 | } | |
73880c80 GN |
1701 | if (atomic_read(&kvm->online_vcpus) == KVM_MAX_VCPUS) { |
1702 | r = -EINVAL; | |
d780592b | 1703 | goto unlock_vcpu_destroy; |
fb3f0f51 | 1704 | } |
73880c80 | 1705 | |
988a2cae GN |
1706 | kvm_for_each_vcpu(r, v, kvm) |
1707 | if (v->vcpu_id == id) { | |
73880c80 | 1708 | r = -EEXIST; |
d780592b | 1709 | goto unlock_vcpu_destroy; |
73880c80 GN |
1710 | } |
1711 | ||
1712 | BUG_ON(kvm->vcpus[atomic_read(&kvm->online_vcpus)]); | |
c5ea7660 | 1713 | |
fb3f0f51 | 1714 | /* Now it's all set up, let userspace reach it */ |
66c0b394 | 1715 | kvm_get_kvm(kvm); |
bccf2150 | 1716 | r = create_vcpu_fd(vcpu); |
73880c80 GN |
1717 | if (r < 0) { |
1718 | kvm_put_kvm(kvm); | |
d780592b | 1719 | goto unlock_vcpu_destroy; |
73880c80 GN |
1720 | } |
1721 | ||
1722 | kvm->vcpus[atomic_read(&kvm->online_vcpus)] = vcpu; | |
1723 | smp_wmb(); | |
1724 | atomic_inc(&kvm->online_vcpus); | |
1725 | ||
73880c80 | 1726 | mutex_unlock(&kvm->lock); |
fb3f0f51 | 1727 | return r; |
39c3b86e | 1728 | |
d780592b | 1729 | unlock_vcpu_destroy: |
7d8fece6 | 1730 | mutex_unlock(&kvm->lock); |
d780592b | 1731 | vcpu_destroy: |
d40ccc62 | 1732 | kvm_arch_vcpu_destroy(vcpu); |
c5ea7660 AK |
1733 | return r; |
1734 | } | |
1735 | ||
1961d276 AK |
1736 | static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu *vcpu, sigset_t *sigset) |
1737 | { | |
1738 | if (sigset) { | |
1739 | sigdelsetmask(sigset, sigmask(SIGKILL)|sigmask(SIGSTOP)); | |
1740 | vcpu->sigset_active = 1; | |
1741 | vcpu->sigset = *sigset; | |
1742 | } else | |
1743 | vcpu->sigset_active = 0; | |
1744 | return 0; | |
1745 | } | |
1746 | ||
bccf2150 AK |
1747 | static long kvm_vcpu_ioctl(struct file *filp, |
1748 | unsigned int ioctl, unsigned long arg) | |
6aa8b732 | 1749 | { |
bccf2150 | 1750 | struct kvm_vcpu *vcpu = filp->private_data; |
2f366987 | 1751 | void __user *argp = (void __user *)arg; |
313a3dc7 | 1752 | int r; |
fa3795a7 DH |
1753 | struct kvm_fpu *fpu = NULL; |
1754 | struct kvm_sregs *kvm_sregs = NULL; | |
6aa8b732 | 1755 | |
6d4e4c4f AK |
1756 | if (vcpu->kvm->mm != current->mm) |
1757 | return -EIO; | |
2122ff5e AK |
1758 | |
1759 | #if defined(CONFIG_S390) || defined(CONFIG_PPC) | |
1760 | /* | |
1761 | * Special cases: vcpu ioctls that are asynchronous to vcpu execution, | |
1762 | * so vcpu_load() would break it. | |
1763 | */ | |
1764 | if (ioctl == KVM_S390_INTERRUPT || ioctl == KVM_INTERRUPT) | |
1765 | return kvm_arch_vcpu_ioctl(filp, ioctl, arg); | |
1766 | #endif | |
1767 | ||
1768 | ||
1769 | vcpu_load(vcpu); | |
6aa8b732 | 1770 | switch (ioctl) { |
9a2bb7f4 | 1771 | case KVM_RUN: |
f0fe5108 AK |
1772 | r = -EINVAL; |
1773 | if (arg) | |
1774 | goto out; | |
b6c7a5dc | 1775 | r = kvm_arch_vcpu_ioctl_run(vcpu, vcpu->run); |
64be5007 | 1776 | trace_kvm_userspace_exit(vcpu->run->exit_reason, r); |
6aa8b732 | 1777 | break; |
6aa8b732 | 1778 | case KVM_GET_REGS: { |
3e4bb3ac | 1779 | struct kvm_regs *kvm_regs; |
6aa8b732 | 1780 | |
3e4bb3ac XZ |
1781 | r = -ENOMEM; |
1782 | kvm_regs = kzalloc(sizeof(struct kvm_regs), GFP_KERNEL); | |
1783 | if (!kvm_regs) | |
6aa8b732 | 1784 | goto out; |
3e4bb3ac XZ |
1785 | r = kvm_arch_vcpu_ioctl_get_regs(vcpu, kvm_regs); |
1786 | if (r) | |
1787 | goto out_free1; | |
6aa8b732 | 1788 | r = -EFAULT; |
3e4bb3ac XZ |
1789 | if (copy_to_user(argp, kvm_regs, sizeof(struct kvm_regs))) |
1790 | goto out_free1; | |
6aa8b732 | 1791 | r = 0; |
3e4bb3ac XZ |
1792 | out_free1: |
1793 | kfree(kvm_regs); | |
6aa8b732 AK |
1794 | break; |
1795 | } | |
1796 | case KVM_SET_REGS: { | |
3e4bb3ac | 1797 | struct kvm_regs *kvm_regs; |
6aa8b732 | 1798 | |
3e4bb3ac | 1799 | r = -ENOMEM; |
ff5c2c03 SL |
1800 | kvm_regs = memdup_user(argp, sizeof(*kvm_regs)); |
1801 | if (IS_ERR(kvm_regs)) { | |
1802 | r = PTR_ERR(kvm_regs); | |
6aa8b732 | 1803 | goto out; |
ff5c2c03 | 1804 | } |
3e4bb3ac | 1805 | r = kvm_arch_vcpu_ioctl_set_regs(vcpu, kvm_regs); |
6aa8b732 | 1806 | if (r) |
3e4bb3ac | 1807 | goto out_free2; |
6aa8b732 | 1808 | r = 0; |
3e4bb3ac XZ |
1809 | out_free2: |
1810 | kfree(kvm_regs); | |
6aa8b732 AK |
1811 | break; |
1812 | } | |
1813 | case KVM_GET_SREGS: { | |
fa3795a7 DH |
1814 | kvm_sregs = kzalloc(sizeof(struct kvm_sregs), GFP_KERNEL); |
1815 | r = -ENOMEM; | |
1816 | if (!kvm_sregs) | |
1817 | goto out; | |
1818 | r = kvm_arch_vcpu_ioctl_get_sregs(vcpu, kvm_sregs); | |
6aa8b732 AK |
1819 | if (r) |
1820 | goto out; | |
1821 | r = -EFAULT; | |
fa3795a7 | 1822 | if (copy_to_user(argp, kvm_sregs, sizeof(struct kvm_sregs))) |
6aa8b732 AK |
1823 | goto out; |
1824 | r = 0; | |
1825 | break; | |
1826 | } | |
1827 | case KVM_SET_SREGS: { | |
ff5c2c03 SL |
1828 | kvm_sregs = memdup_user(argp, sizeof(*kvm_sregs)); |
1829 | if (IS_ERR(kvm_sregs)) { | |
1830 | r = PTR_ERR(kvm_sregs); | |
6aa8b732 | 1831 | goto out; |
ff5c2c03 | 1832 | } |
fa3795a7 | 1833 | r = kvm_arch_vcpu_ioctl_set_sregs(vcpu, kvm_sregs); |
6aa8b732 AK |
1834 | if (r) |
1835 | goto out; | |
1836 | r = 0; | |
1837 | break; | |
1838 | } | |
62d9f0db MT |
1839 | case KVM_GET_MP_STATE: { |
1840 | struct kvm_mp_state mp_state; | |
1841 | ||
1842 | r = kvm_arch_vcpu_ioctl_get_mpstate(vcpu, &mp_state); | |
1843 | if (r) | |
1844 | goto out; | |
1845 | r = -EFAULT; | |
1846 | if (copy_to_user(argp, &mp_state, sizeof mp_state)) | |
1847 | goto out; | |
1848 | r = 0; | |
1849 | break; | |
1850 | } | |
1851 | case KVM_SET_MP_STATE: { | |
1852 | struct kvm_mp_state mp_state; | |
1853 | ||
1854 | r = -EFAULT; | |
1855 | if (copy_from_user(&mp_state, argp, sizeof mp_state)) | |
1856 | goto out; | |
1857 | r = kvm_arch_vcpu_ioctl_set_mpstate(vcpu, &mp_state); | |
1858 | if (r) | |
1859 | goto out; | |
1860 | r = 0; | |
1861 | break; | |
1862 | } | |
6aa8b732 AK |
1863 | case KVM_TRANSLATE: { |
1864 | struct kvm_translation tr; | |
1865 | ||
1866 | r = -EFAULT; | |
2f366987 | 1867 | if (copy_from_user(&tr, argp, sizeof tr)) |
6aa8b732 | 1868 | goto out; |
8b006791 | 1869 | r = kvm_arch_vcpu_ioctl_translate(vcpu, &tr); |
6aa8b732 AK |
1870 | if (r) |
1871 | goto out; | |
1872 | r = -EFAULT; | |
2f366987 | 1873 | if (copy_to_user(argp, &tr, sizeof tr)) |
6aa8b732 AK |
1874 | goto out; |
1875 | r = 0; | |
1876 | break; | |
1877 | } | |
d0bfb940 JK |
1878 | case KVM_SET_GUEST_DEBUG: { |
1879 | struct kvm_guest_debug dbg; | |
6aa8b732 AK |
1880 | |
1881 | r = -EFAULT; | |
2f366987 | 1882 | if (copy_from_user(&dbg, argp, sizeof dbg)) |
6aa8b732 | 1883 | goto out; |
d0bfb940 | 1884 | r = kvm_arch_vcpu_ioctl_set_guest_debug(vcpu, &dbg); |
6aa8b732 AK |
1885 | if (r) |
1886 | goto out; | |
1887 | r = 0; | |
1888 | break; | |
1889 | } | |
1961d276 AK |
1890 | case KVM_SET_SIGNAL_MASK: { |
1891 | struct kvm_signal_mask __user *sigmask_arg = argp; | |
1892 | struct kvm_signal_mask kvm_sigmask; | |
1893 | sigset_t sigset, *p; | |
1894 | ||
1895 | p = NULL; | |
1896 | if (argp) { | |
1897 | r = -EFAULT; | |
1898 | if (copy_from_user(&kvm_sigmask, argp, | |
1899 | sizeof kvm_sigmask)) | |
1900 | goto out; | |
1901 | r = -EINVAL; | |
1902 | if (kvm_sigmask.len != sizeof sigset) | |
1903 | goto out; | |
1904 | r = -EFAULT; | |
1905 | if (copy_from_user(&sigset, sigmask_arg->sigset, | |
1906 | sizeof sigset)) | |
1907 | goto out; | |
1908 | p = &sigset; | |
1909 | } | |
376d41ff | 1910 | r = kvm_vcpu_ioctl_set_sigmask(vcpu, p); |
1961d276 AK |
1911 | break; |
1912 | } | |
b8836737 | 1913 | case KVM_GET_FPU: { |
fa3795a7 DH |
1914 | fpu = kzalloc(sizeof(struct kvm_fpu), GFP_KERNEL); |
1915 | r = -ENOMEM; | |
1916 | if (!fpu) | |
1917 | goto out; | |
1918 | r = kvm_arch_vcpu_ioctl_get_fpu(vcpu, fpu); | |
b8836737 AK |
1919 | if (r) |
1920 | goto out; | |
1921 | r = -EFAULT; | |
fa3795a7 | 1922 | if (copy_to_user(argp, fpu, sizeof(struct kvm_fpu))) |
b8836737 AK |
1923 | goto out; |
1924 | r = 0; | |
1925 | break; | |
1926 | } | |
1927 | case KVM_SET_FPU: { | |
ff5c2c03 SL |
1928 | fpu = memdup_user(argp, sizeof(*fpu)); |
1929 | if (IS_ERR(fpu)) { | |
1930 | r = PTR_ERR(fpu); | |
b8836737 | 1931 | goto out; |
ff5c2c03 | 1932 | } |
fa3795a7 | 1933 | r = kvm_arch_vcpu_ioctl_set_fpu(vcpu, fpu); |
b8836737 AK |
1934 | if (r) |
1935 | goto out; | |
1936 | r = 0; | |
1937 | break; | |
1938 | } | |
bccf2150 | 1939 | default: |
313a3dc7 | 1940 | r = kvm_arch_vcpu_ioctl(filp, ioctl, arg); |
bccf2150 AK |
1941 | } |
1942 | out: | |
2122ff5e | 1943 | vcpu_put(vcpu); |
fa3795a7 DH |
1944 | kfree(fpu); |
1945 | kfree(kvm_sregs); | |
bccf2150 AK |
1946 | return r; |
1947 | } | |
1948 | ||
1dda606c AG |
1949 | #ifdef CONFIG_COMPAT |
1950 | static long kvm_vcpu_compat_ioctl(struct file *filp, | |
1951 | unsigned int ioctl, unsigned long arg) | |
1952 | { | |
1953 | struct kvm_vcpu *vcpu = filp->private_data; | |
1954 | void __user *argp = compat_ptr(arg); | |
1955 | int r; | |
1956 | ||
1957 | if (vcpu->kvm->mm != current->mm) | |
1958 | return -EIO; | |
1959 | ||
1960 | switch (ioctl) { | |
1961 | case KVM_SET_SIGNAL_MASK: { | |
1962 | struct kvm_signal_mask __user *sigmask_arg = argp; | |
1963 | struct kvm_signal_mask kvm_sigmask; | |
1964 | compat_sigset_t csigset; | |
1965 | sigset_t sigset; | |
1966 | ||
1967 | if (argp) { | |
1968 | r = -EFAULT; | |
1969 | if (copy_from_user(&kvm_sigmask, argp, | |
1970 | sizeof kvm_sigmask)) | |
1971 | goto out; | |
1972 | r = -EINVAL; | |
1973 | if (kvm_sigmask.len != sizeof csigset) | |
1974 | goto out; | |
1975 | r = -EFAULT; | |
1976 | if (copy_from_user(&csigset, sigmask_arg->sigset, | |
1977 | sizeof csigset)) | |
1978 | goto out; | |
1979 | } | |
1980 | sigset_from_compat(&sigset, &csigset); | |
1981 | r = kvm_vcpu_ioctl_set_sigmask(vcpu, &sigset); | |
1982 | break; | |
1983 | } | |
1984 | default: | |
1985 | r = kvm_vcpu_ioctl(filp, ioctl, arg); | |
1986 | } | |
1987 | ||
1988 | out: | |
1989 | return r; | |
1990 | } | |
1991 | #endif | |
1992 | ||
bccf2150 AK |
1993 | static long kvm_vm_ioctl(struct file *filp, |
1994 | unsigned int ioctl, unsigned long arg) | |
1995 | { | |
1996 | struct kvm *kvm = filp->private_data; | |
1997 | void __user *argp = (void __user *)arg; | |
1fe779f8 | 1998 | int r; |
bccf2150 | 1999 | |
6d4e4c4f AK |
2000 | if (kvm->mm != current->mm) |
2001 | return -EIO; | |
bccf2150 AK |
2002 | switch (ioctl) { |
2003 | case KVM_CREATE_VCPU: | |
2004 | r = kvm_vm_ioctl_create_vcpu(kvm, arg); | |
2005 | if (r < 0) | |
2006 | goto out; | |
2007 | break; | |
6fc138d2 IE |
2008 | case KVM_SET_USER_MEMORY_REGION: { |
2009 | struct kvm_userspace_memory_region kvm_userspace_mem; | |
2010 | ||
2011 | r = -EFAULT; | |
2012 | if (copy_from_user(&kvm_userspace_mem, argp, | |
2013 | sizeof kvm_userspace_mem)) | |
2014 | goto out; | |
2015 | ||
2016 | r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_userspace_mem, 1); | |
6aa8b732 AK |
2017 | if (r) |
2018 | goto out; | |
2019 | break; | |
2020 | } | |
2021 | case KVM_GET_DIRTY_LOG: { | |
2022 | struct kvm_dirty_log log; | |
2023 | ||
2024 | r = -EFAULT; | |
2f366987 | 2025 | if (copy_from_user(&log, argp, sizeof log)) |
6aa8b732 | 2026 | goto out; |
2c6f5df9 | 2027 | r = kvm_vm_ioctl_get_dirty_log(kvm, &log); |
6aa8b732 AK |
2028 | if (r) |
2029 | goto out; | |
2030 | break; | |
2031 | } | |
5f94c174 LV |
2032 | #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET |
2033 | case KVM_REGISTER_COALESCED_MMIO: { | |
2034 | struct kvm_coalesced_mmio_zone zone; | |
2035 | r = -EFAULT; | |
2036 | if (copy_from_user(&zone, argp, sizeof zone)) | |
2037 | goto out; | |
5f94c174 LV |
2038 | r = kvm_vm_ioctl_register_coalesced_mmio(kvm, &zone); |
2039 | if (r) | |
2040 | goto out; | |
2041 | r = 0; | |
2042 | break; | |
2043 | } | |
2044 | case KVM_UNREGISTER_COALESCED_MMIO: { | |
2045 | struct kvm_coalesced_mmio_zone zone; | |
2046 | r = -EFAULT; | |
2047 | if (copy_from_user(&zone, argp, sizeof zone)) | |
2048 | goto out; | |
5f94c174 LV |
2049 | r = kvm_vm_ioctl_unregister_coalesced_mmio(kvm, &zone); |
2050 | if (r) | |
2051 | goto out; | |
2052 | r = 0; | |
2053 | break; | |
2054 | } | |
2055 | #endif | |
721eecbf GH |
2056 | case KVM_IRQFD: { |
2057 | struct kvm_irqfd data; | |
2058 | ||
2059 | r = -EFAULT; | |
2060 | if (copy_from_user(&data, argp, sizeof data)) | |
2061 | goto out; | |
2062 | r = kvm_irqfd(kvm, data.fd, data.gsi, data.flags); | |
2063 | break; | |
2064 | } | |
d34e6b17 GH |
2065 | case KVM_IOEVENTFD: { |
2066 | struct kvm_ioeventfd data; | |
2067 | ||
2068 | r = -EFAULT; | |
2069 | if (copy_from_user(&data, argp, sizeof data)) | |
2070 | goto out; | |
2071 | r = kvm_ioeventfd(kvm, &data); | |
2072 | break; | |
2073 | } | |
73880c80 GN |
2074 | #ifdef CONFIG_KVM_APIC_ARCHITECTURE |
2075 | case KVM_SET_BOOT_CPU_ID: | |
2076 | r = 0; | |
894a9c55 | 2077 | mutex_lock(&kvm->lock); |
73880c80 GN |
2078 | if (atomic_read(&kvm->online_vcpus) != 0) |
2079 | r = -EBUSY; | |
2080 | else | |
2081 | kvm->bsp_vcpu_id = arg; | |
894a9c55 | 2082 | mutex_unlock(&kvm->lock); |
73880c80 | 2083 | break; |
07975ad3 JK |
2084 | #endif |
2085 | #ifdef CONFIG_HAVE_KVM_MSI | |
2086 | case KVM_SIGNAL_MSI: { | |
2087 | struct kvm_msi msi; | |
2088 | ||
2089 | r = -EFAULT; | |
2090 | if (copy_from_user(&msi, argp, sizeof msi)) | |
2091 | goto out; | |
2092 | r = kvm_send_userspace_msi(kvm, &msi); | |
2093 | break; | |
2094 | } | |
73880c80 | 2095 | #endif |
f17abe9a | 2096 | default: |
1fe779f8 | 2097 | r = kvm_arch_vm_ioctl(filp, ioctl, arg); |
bfd99ff5 AK |
2098 | if (r == -ENOTTY) |
2099 | r = kvm_vm_ioctl_assigned_device(kvm, ioctl, arg); | |
f17abe9a AK |
2100 | } |
2101 | out: | |
2102 | return r; | |
2103 | } | |
2104 | ||
6ff5894c AB |
2105 | #ifdef CONFIG_COMPAT |
2106 | struct compat_kvm_dirty_log { | |
2107 | __u32 slot; | |
2108 | __u32 padding1; | |
2109 | union { | |
2110 | compat_uptr_t dirty_bitmap; /* one bit per page */ | |
2111 | __u64 padding2; | |
2112 | }; | |
2113 | }; | |
2114 | ||
2115 | static long kvm_vm_compat_ioctl(struct file *filp, | |
2116 | unsigned int ioctl, unsigned long arg) | |
2117 | { | |
2118 | struct kvm *kvm = filp->private_data; | |
2119 | int r; | |
2120 | ||
2121 | if (kvm->mm != current->mm) | |
2122 | return -EIO; | |
2123 | switch (ioctl) { | |
2124 | case KVM_GET_DIRTY_LOG: { | |
2125 | struct compat_kvm_dirty_log compat_log; | |
2126 | struct kvm_dirty_log log; | |
2127 | ||
2128 | r = -EFAULT; | |
2129 | if (copy_from_user(&compat_log, (void __user *)arg, | |
2130 | sizeof(compat_log))) | |
2131 | goto out; | |
2132 | log.slot = compat_log.slot; | |
2133 | log.padding1 = compat_log.padding1; | |
2134 | log.padding2 = compat_log.padding2; | |
2135 | log.dirty_bitmap = compat_ptr(compat_log.dirty_bitmap); | |
2136 | ||
2137 | r = kvm_vm_ioctl_get_dirty_log(kvm, &log); | |
2138 | if (r) | |
2139 | goto out; | |
2140 | break; | |
2141 | } | |
2142 | default: | |
2143 | r = kvm_vm_ioctl(filp, ioctl, arg); | |
2144 | } | |
2145 | ||
2146 | out: | |
2147 | return r; | |
2148 | } | |
2149 | #endif | |
2150 | ||
e4a533a4 | 2151 | static int kvm_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf) |
f17abe9a | 2152 | { |
777b3f49 MT |
2153 | struct page *page[1]; |
2154 | unsigned long addr; | |
2155 | int npages; | |
2156 | gfn_t gfn = vmf->pgoff; | |
f17abe9a | 2157 | struct kvm *kvm = vma->vm_file->private_data; |
f17abe9a | 2158 | |
777b3f49 MT |
2159 | addr = gfn_to_hva(kvm, gfn); |
2160 | if (kvm_is_error_hva(addr)) | |
e4a533a4 | 2161 | return VM_FAULT_SIGBUS; |
777b3f49 MT |
2162 | |
2163 | npages = get_user_pages(current, current->mm, addr, 1, 1, 0, page, | |
2164 | NULL); | |
2165 | if (unlikely(npages != 1)) | |
e4a533a4 | 2166 | return VM_FAULT_SIGBUS; |
777b3f49 MT |
2167 | |
2168 | vmf->page = page[0]; | |
e4a533a4 | 2169 | return 0; |
f17abe9a AK |
2170 | } |
2171 | ||
f0f37e2f | 2172 | static const struct vm_operations_struct kvm_vm_vm_ops = { |
e4a533a4 | 2173 | .fault = kvm_vm_fault, |
f17abe9a AK |
2174 | }; |
2175 | ||
2176 | static int kvm_vm_mmap(struct file *file, struct vm_area_struct *vma) | |
2177 | { | |
2178 | vma->vm_ops = &kvm_vm_vm_ops; | |
2179 | return 0; | |
2180 | } | |
2181 | ||
3d3aab1b | 2182 | static struct file_operations kvm_vm_fops = { |
f17abe9a AK |
2183 | .release = kvm_vm_release, |
2184 | .unlocked_ioctl = kvm_vm_ioctl, | |
6ff5894c AB |
2185 | #ifdef CONFIG_COMPAT |
2186 | .compat_ioctl = kvm_vm_compat_ioctl, | |
2187 | #endif | |
f17abe9a | 2188 | .mmap = kvm_vm_mmap, |
6038f373 | 2189 | .llseek = noop_llseek, |
f17abe9a AK |
2190 | }; |
2191 | ||
e08b9637 | 2192 | static int kvm_dev_ioctl_create_vm(unsigned long type) |
f17abe9a | 2193 | { |
aac87636 | 2194 | int r; |
f17abe9a AK |
2195 | struct kvm *kvm; |
2196 | ||
e08b9637 | 2197 | kvm = kvm_create_vm(type); |
d6d28168 AK |
2198 | if (IS_ERR(kvm)) |
2199 | return PTR_ERR(kvm); | |
6ce5a090 TY |
2200 | #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET |
2201 | r = kvm_coalesced_mmio_init(kvm); | |
2202 | if (r < 0) { | |
2203 | kvm_put_kvm(kvm); | |
2204 | return r; | |
2205 | } | |
2206 | #endif | |
aac87636 HC |
2207 | r = anon_inode_getfd("kvm-vm", &kvm_vm_fops, kvm, O_RDWR); |
2208 | if (r < 0) | |
66c0b394 | 2209 | kvm_put_kvm(kvm); |
f17abe9a | 2210 | |
aac87636 | 2211 | return r; |
f17abe9a AK |
2212 | } |
2213 | ||
1a811b61 AK |
2214 | static long kvm_dev_ioctl_check_extension_generic(long arg) |
2215 | { | |
2216 | switch (arg) { | |
ca9edaee | 2217 | case KVM_CAP_USER_MEMORY: |
1a811b61 | 2218 | case KVM_CAP_DESTROY_MEMORY_REGION_WORKS: |
4cd481f6 | 2219 | case KVM_CAP_JOIN_MEMORY_REGIONS_WORKS: |
73880c80 GN |
2220 | #ifdef CONFIG_KVM_APIC_ARCHITECTURE |
2221 | case KVM_CAP_SET_BOOT_CPU_ID: | |
2222 | #endif | |
a9c7399d | 2223 | case KVM_CAP_INTERNAL_ERROR_DATA: |
07975ad3 JK |
2224 | #ifdef CONFIG_HAVE_KVM_MSI |
2225 | case KVM_CAP_SIGNAL_MSI: | |
2226 | #endif | |
1a811b61 | 2227 | return 1; |
399ec807 AK |
2228 | #ifdef CONFIG_HAVE_KVM_IRQCHIP |
2229 | case KVM_CAP_IRQ_ROUTING: | |
36463146 | 2230 | return KVM_MAX_IRQ_ROUTES; |
399ec807 | 2231 | #endif |
1a811b61 AK |
2232 | default: |
2233 | break; | |
2234 | } | |
2235 | return kvm_dev_ioctl_check_extension(arg); | |
2236 | } | |
2237 | ||
f17abe9a AK |
2238 | static long kvm_dev_ioctl(struct file *filp, |
2239 | unsigned int ioctl, unsigned long arg) | |
2240 | { | |
07c45a36 | 2241 | long r = -EINVAL; |
f17abe9a AK |
2242 | |
2243 | switch (ioctl) { | |
2244 | case KVM_GET_API_VERSION: | |
f0fe5108 AK |
2245 | r = -EINVAL; |
2246 | if (arg) | |
2247 | goto out; | |
f17abe9a AK |
2248 | r = KVM_API_VERSION; |
2249 | break; | |
2250 | case KVM_CREATE_VM: | |
e08b9637 | 2251 | r = kvm_dev_ioctl_create_vm(arg); |
f17abe9a | 2252 | break; |
018d00d2 | 2253 | case KVM_CHECK_EXTENSION: |
1a811b61 | 2254 | r = kvm_dev_ioctl_check_extension_generic(arg); |
5d308f45 | 2255 | break; |
07c45a36 AK |
2256 | case KVM_GET_VCPU_MMAP_SIZE: |
2257 | r = -EINVAL; | |
2258 | if (arg) | |
2259 | goto out; | |
adb1ff46 AK |
2260 | r = PAGE_SIZE; /* struct kvm_run */ |
2261 | #ifdef CONFIG_X86 | |
2262 | r += PAGE_SIZE; /* pio data page */ | |
5f94c174 LV |
2263 | #endif |
2264 | #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET | |
2265 | r += PAGE_SIZE; /* coalesced mmio ring page */ | |
adb1ff46 | 2266 | #endif |
07c45a36 | 2267 | break; |
d4c9ff2d FEL |
2268 | case KVM_TRACE_ENABLE: |
2269 | case KVM_TRACE_PAUSE: | |
2270 | case KVM_TRACE_DISABLE: | |
2023a29c | 2271 | r = -EOPNOTSUPP; |
d4c9ff2d | 2272 | break; |
6aa8b732 | 2273 | default: |
043405e1 | 2274 | return kvm_arch_dev_ioctl(filp, ioctl, arg); |
6aa8b732 AK |
2275 | } |
2276 | out: | |
2277 | return r; | |
2278 | } | |
2279 | ||
6aa8b732 | 2280 | static struct file_operations kvm_chardev_ops = { |
6aa8b732 AK |
2281 | .unlocked_ioctl = kvm_dev_ioctl, |
2282 | .compat_ioctl = kvm_dev_ioctl, | |
6038f373 | 2283 | .llseek = noop_llseek, |
6aa8b732 AK |
2284 | }; |
2285 | ||
2286 | static struct miscdevice kvm_dev = { | |
bbe4432e | 2287 | KVM_MINOR, |
6aa8b732 AK |
2288 | "kvm", |
2289 | &kvm_chardev_ops, | |
2290 | }; | |
2291 | ||
75b7127c | 2292 | static void hardware_enable_nolock(void *junk) |
1b6c0168 AK |
2293 | { |
2294 | int cpu = raw_smp_processor_id(); | |
10474ae8 | 2295 | int r; |
1b6c0168 | 2296 | |
7f59f492 | 2297 | if (cpumask_test_cpu(cpu, cpus_hardware_enabled)) |
1b6c0168 | 2298 | return; |
10474ae8 | 2299 | |
7f59f492 | 2300 | cpumask_set_cpu(cpu, cpus_hardware_enabled); |
10474ae8 AG |
2301 | |
2302 | r = kvm_arch_hardware_enable(NULL); | |
2303 | ||
2304 | if (r) { | |
2305 | cpumask_clear_cpu(cpu, cpus_hardware_enabled); | |
2306 | atomic_inc(&hardware_enable_failed); | |
2307 | printk(KERN_INFO "kvm: enabling virtualization on " | |
2308 | "CPU%d failed\n", cpu); | |
2309 | } | |
1b6c0168 AK |
2310 | } |
2311 | ||
75b7127c TY |
2312 | static void hardware_enable(void *junk) |
2313 | { | |
e935b837 | 2314 | raw_spin_lock(&kvm_lock); |
75b7127c | 2315 | hardware_enable_nolock(junk); |
e935b837 | 2316 | raw_spin_unlock(&kvm_lock); |
75b7127c TY |
2317 | } |
2318 | ||
2319 | static void hardware_disable_nolock(void *junk) | |
1b6c0168 AK |
2320 | { |
2321 | int cpu = raw_smp_processor_id(); | |
2322 | ||
7f59f492 | 2323 | if (!cpumask_test_cpu(cpu, cpus_hardware_enabled)) |
1b6c0168 | 2324 | return; |
7f59f492 | 2325 | cpumask_clear_cpu(cpu, cpus_hardware_enabled); |
e9b11c17 | 2326 | kvm_arch_hardware_disable(NULL); |
1b6c0168 AK |
2327 | } |
2328 | ||
75b7127c TY |
2329 | static void hardware_disable(void *junk) |
2330 | { | |
e935b837 | 2331 | raw_spin_lock(&kvm_lock); |
75b7127c | 2332 | hardware_disable_nolock(junk); |
e935b837 | 2333 | raw_spin_unlock(&kvm_lock); |
75b7127c TY |
2334 | } |
2335 | ||
10474ae8 AG |
2336 | static void hardware_disable_all_nolock(void) |
2337 | { | |
2338 | BUG_ON(!kvm_usage_count); | |
2339 | ||
2340 | kvm_usage_count--; | |
2341 | if (!kvm_usage_count) | |
75b7127c | 2342 | on_each_cpu(hardware_disable_nolock, NULL, 1); |
10474ae8 AG |
2343 | } |
2344 | ||
2345 | static void hardware_disable_all(void) | |
2346 | { | |
e935b837 | 2347 | raw_spin_lock(&kvm_lock); |
10474ae8 | 2348 | hardware_disable_all_nolock(); |
e935b837 | 2349 | raw_spin_unlock(&kvm_lock); |
10474ae8 AG |
2350 | } |
2351 | ||
2352 | static int hardware_enable_all(void) | |
2353 | { | |
2354 | int r = 0; | |
2355 | ||
e935b837 | 2356 | raw_spin_lock(&kvm_lock); |
10474ae8 AG |
2357 | |
2358 | kvm_usage_count++; | |
2359 | if (kvm_usage_count == 1) { | |
2360 | atomic_set(&hardware_enable_failed, 0); | |
75b7127c | 2361 | on_each_cpu(hardware_enable_nolock, NULL, 1); |
10474ae8 AG |
2362 | |
2363 | if (atomic_read(&hardware_enable_failed)) { | |
2364 | hardware_disable_all_nolock(); | |
2365 | r = -EBUSY; | |
2366 | } | |
2367 | } | |
2368 | ||
e935b837 | 2369 | raw_spin_unlock(&kvm_lock); |
10474ae8 AG |
2370 | |
2371 | return r; | |
2372 | } | |
2373 | ||
774c47f1 AK |
2374 | static int kvm_cpu_hotplug(struct notifier_block *notifier, unsigned long val, |
2375 | void *v) | |
2376 | { | |
2377 | int cpu = (long)v; | |
2378 | ||
10474ae8 AG |
2379 | if (!kvm_usage_count) |
2380 | return NOTIFY_OK; | |
2381 | ||
1a6f4d7f | 2382 | val &= ~CPU_TASKS_FROZEN; |
774c47f1 | 2383 | switch (val) { |
cec9ad27 | 2384 | case CPU_DYING: |
6ec8a856 AK |
2385 | printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n", |
2386 | cpu); | |
2387 | hardware_disable(NULL); | |
2388 | break; | |
da908f2f | 2389 | case CPU_STARTING: |
43934a38 JK |
2390 | printk(KERN_INFO "kvm: enabling virtualization on CPU%d\n", |
2391 | cpu); | |
da908f2f | 2392 | hardware_enable(NULL); |
774c47f1 AK |
2393 | break; |
2394 | } | |
2395 | return NOTIFY_OK; | |
2396 | } | |
2397 | ||
4ecac3fd | 2398 | |
b7c4145b | 2399 | asmlinkage void kvm_spurious_fault(void) |
4ecac3fd | 2400 | { |
4ecac3fd AK |
2401 | /* Fault while not rebooting. We want the trace. */ |
2402 | BUG(); | |
2403 | } | |
b7c4145b | 2404 | EXPORT_SYMBOL_GPL(kvm_spurious_fault); |
4ecac3fd | 2405 | |
9a2b85c6 | 2406 | static int kvm_reboot(struct notifier_block *notifier, unsigned long val, |
d77c26fc | 2407 | void *v) |
9a2b85c6 | 2408 | { |
8e1c1815 SY |
2409 | /* |
2410 | * Some (well, at least mine) BIOSes hang on reboot if | |
2411 | * in vmx root mode. | |
2412 | * | |
2413 | * And Intel TXT required VMX off for all cpu when system shutdown. | |
2414 | */ | |
2415 | printk(KERN_INFO "kvm: exiting hardware virtualization\n"); | |
2416 | kvm_rebooting = true; | |
75b7127c | 2417 | on_each_cpu(hardware_disable_nolock, NULL, 1); |
9a2b85c6 RR |
2418 | return NOTIFY_OK; |
2419 | } | |
2420 | ||
2421 | static struct notifier_block kvm_reboot_notifier = { | |
2422 | .notifier_call = kvm_reboot, | |
2423 | .priority = 0, | |
2424 | }; | |
2425 | ||
e93f8a0f | 2426 | static void kvm_io_bus_destroy(struct kvm_io_bus *bus) |
2eeb2e94 GH |
2427 | { |
2428 | int i; | |
2429 | ||
2430 | for (i = 0; i < bus->dev_count; i++) { | |
743eeb0b | 2431 | struct kvm_io_device *pos = bus->range[i].dev; |
2eeb2e94 GH |
2432 | |
2433 | kvm_iodevice_destructor(pos); | |
2434 | } | |
e93f8a0f | 2435 | kfree(bus); |
2eeb2e94 GH |
2436 | } |
2437 | ||
743eeb0b SL |
2438 | int kvm_io_bus_sort_cmp(const void *p1, const void *p2) |
2439 | { | |
2440 | const struct kvm_io_range *r1 = p1; | |
2441 | const struct kvm_io_range *r2 = p2; | |
2442 | ||
2443 | if (r1->addr < r2->addr) | |
2444 | return -1; | |
2445 | if (r1->addr + r1->len > r2->addr + r2->len) | |
2446 | return 1; | |
2447 | return 0; | |
2448 | } | |
2449 | ||
2450 | int kvm_io_bus_insert_dev(struct kvm_io_bus *bus, struct kvm_io_device *dev, | |
2451 | gpa_t addr, int len) | |
2452 | { | |
743eeb0b SL |
2453 | bus->range[bus->dev_count++] = (struct kvm_io_range) { |
2454 | .addr = addr, | |
2455 | .len = len, | |
2456 | .dev = dev, | |
2457 | }; | |
2458 | ||
2459 | sort(bus->range, bus->dev_count, sizeof(struct kvm_io_range), | |
2460 | kvm_io_bus_sort_cmp, NULL); | |
2461 | ||
2462 | return 0; | |
2463 | } | |
2464 | ||
2465 | int kvm_io_bus_get_first_dev(struct kvm_io_bus *bus, | |
2466 | gpa_t addr, int len) | |
2467 | { | |
2468 | struct kvm_io_range *range, key; | |
2469 | int off; | |
2470 | ||
2471 | key = (struct kvm_io_range) { | |
2472 | .addr = addr, | |
2473 | .len = len, | |
2474 | }; | |
2475 | ||
2476 | range = bsearch(&key, bus->range, bus->dev_count, | |
2477 | sizeof(struct kvm_io_range), kvm_io_bus_sort_cmp); | |
2478 | if (range == NULL) | |
2479 | return -ENOENT; | |
2480 | ||
2481 | off = range - bus->range; | |
2482 | ||
2483 | while (off > 0 && kvm_io_bus_sort_cmp(&key, &bus->range[off-1]) == 0) | |
2484 | off--; | |
2485 | ||
2486 | return off; | |
2487 | } | |
2488 | ||
bda9020e | 2489 | /* kvm_io_bus_write - called under kvm->slots_lock */ |
e93f8a0f | 2490 | int kvm_io_bus_write(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr, |
bda9020e | 2491 | int len, const void *val) |
2eeb2e94 | 2492 | { |
743eeb0b | 2493 | int idx; |
90d83dc3 | 2494 | struct kvm_io_bus *bus; |
743eeb0b SL |
2495 | struct kvm_io_range range; |
2496 | ||
2497 | range = (struct kvm_io_range) { | |
2498 | .addr = addr, | |
2499 | .len = len, | |
2500 | }; | |
90d83dc3 LJ |
2501 | |
2502 | bus = srcu_dereference(kvm->buses[bus_idx], &kvm->srcu); | |
743eeb0b SL |
2503 | idx = kvm_io_bus_get_first_dev(bus, addr, len); |
2504 | if (idx < 0) | |
2505 | return -EOPNOTSUPP; | |
2506 | ||
2507 | while (idx < bus->dev_count && | |
2508 | kvm_io_bus_sort_cmp(&range, &bus->range[idx]) == 0) { | |
2509 | if (!kvm_iodevice_write(bus->range[idx].dev, addr, len, val)) | |
bda9020e | 2510 | return 0; |
743eeb0b SL |
2511 | idx++; |
2512 | } | |
2513 | ||
bda9020e MT |
2514 | return -EOPNOTSUPP; |
2515 | } | |
2eeb2e94 | 2516 | |
bda9020e | 2517 | /* kvm_io_bus_read - called under kvm->slots_lock */ |
e93f8a0f MT |
2518 | int kvm_io_bus_read(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr, |
2519 | int len, void *val) | |
bda9020e | 2520 | { |
743eeb0b | 2521 | int idx; |
90d83dc3 | 2522 | struct kvm_io_bus *bus; |
743eeb0b SL |
2523 | struct kvm_io_range range; |
2524 | ||
2525 | range = (struct kvm_io_range) { | |
2526 | .addr = addr, | |
2527 | .len = len, | |
2528 | }; | |
e93f8a0f | 2529 | |
90d83dc3 | 2530 | bus = srcu_dereference(kvm->buses[bus_idx], &kvm->srcu); |
743eeb0b SL |
2531 | idx = kvm_io_bus_get_first_dev(bus, addr, len); |
2532 | if (idx < 0) | |
2533 | return -EOPNOTSUPP; | |
2534 | ||
2535 | while (idx < bus->dev_count && | |
2536 | kvm_io_bus_sort_cmp(&range, &bus->range[idx]) == 0) { | |
2537 | if (!kvm_iodevice_read(bus->range[idx].dev, addr, len, val)) | |
bda9020e | 2538 | return 0; |
743eeb0b SL |
2539 | idx++; |
2540 | } | |
2541 | ||
bda9020e | 2542 | return -EOPNOTSUPP; |
2eeb2e94 GH |
2543 | } |
2544 | ||
79fac95e | 2545 | /* Caller must hold slots_lock. */ |
743eeb0b SL |
2546 | int kvm_io_bus_register_dev(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr, |
2547 | int len, struct kvm_io_device *dev) | |
6c474694 | 2548 | { |
e93f8a0f | 2549 | struct kvm_io_bus *new_bus, *bus; |
090b7aff | 2550 | |
e93f8a0f | 2551 | bus = kvm->buses[bus_idx]; |
a1300716 | 2552 | if (bus->dev_count > NR_IOBUS_DEVS - 1) |
090b7aff | 2553 | return -ENOSPC; |
2eeb2e94 | 2554 | |
a1300716 AK |
2555 | new_bus = kzalloc(sizeof(*bus) + ((bus->dev_count + 1) * |
2556 | sizeof(struct kvm_io_range)), GFP_KERNEL); | |
e93f8a0f MT |
2557 | if (!new_bus) |
2558 | return -ENOMEM; | |
a1300716 AK |
2559 | memcpy(new_bus, bus, sizeof(*bus) + (bus->dev_count * |
2560 | sizeof(struct kvm_io_range))); | |
743eeb0b | 2561 | kvm_io_bus_insert_dev(new_bus, dev, addr, len); |
e93f8a0f MT |
2562 | rcu_assign_pointer(kvm->buses[bus_idx], new_bus); |
2563 | synchronize_srcu_expedited(&kvm->srcu); | |
2564 | kfree(bus); | |
090b7aff GH |
2565 | |
2566 | return 0; | |
2567 | } | |
2568 | ||
79fac95e | 2569 | /* Caller must hold slots_lock. */ |
e93f8a0f MT |
2570 | int kvm_io_bus_unregister_dev(struct kvm *kvm, enum kvm_bus bus_idx, |
2571 | struct kvm_io_device *dev) | |
090b7aff | 2572 | { |
e93f8a0f MT |
2573 | int i, r; |
2574 | struct kvm_io_bus *new_bus, *bus; | |
090b7aff | 2575 | |
cdfca7b3 | 2576 | bus = kvm->buses[bus_idx]; |
e93f8a0f | 2577 | r = -ENOENT; |
a1300716 AK |
2578 | for (i = 0; i < bus->dev_count; i++) |
2579 | if (bus->range[i].dev == dev) { | |
e93f8a0f | 2580 | r = 0; |
090b7aff GH |
2581 | break; |
2582 | } | |
e93f8a0f | 2583 | |
a1300716 | 2584 | if (r) |
e93f8a0f | 2585 | return r; |
a1300716 AK |
2586 | |
2587 | new_bus = kzalloc(sizeof(*bus) + ((bus->dev_count - 1) * | |
2588 | sizeof(struct kvm_io_range)), GFP_KERNEL); | |
2589 | if (!new_bus) | |
2590 | return -ENOMEM; | |
2591 | ||
2592 | memcpy(new_bus, bus, sizeof(*bus) + i * sizeof(struct kvm_io_range)); | |
2593 | new_bus->dev_count--; | |
2594 | memcpy(new_bus->range + i, bus->range + i + 1, | |
2595 | (new_bus->dev_count - i) * sizeof(struct kvm_io_range)); | |
e93f8a0f MT |
2596 | |
2597 | rcu_assign_pointer(kvm->buses[bus_idx], new_bus); | |
2598 | synchronize_srcu_expedited(&kvm->srcu); | |
2599 | kfree(bus); | |
2600 | return r; | |
2eeb2e94 GH |
2601 | } |
2602 | ||
774c47f1 AK |
2603 | static struct notifier_block kvm_cpu_notifier = { |
2604 | .notifier_call = kvm_cpu_hotplug, | |
774c47f1 AK |
2605 | }; |
2606 | ||
8b88b099 | 2607 | static int vm_stat_get(void *_offset, u64 *val) |
ba1389b7 AK |
2608 | { |
2609 | unsigned offset = (long)_offset; | |
ba1389b7 AK |
2610 | struct kvm *kvm; |
2611 | ||
8b88b099 | 2612 | *val = 0; |
e935b837 | 2613 | raw_spin_lock(&kvm_lock); |
ba1389b7 | 2614 | list_for_each_entry(kvm, &vm_list, vm_list) |
8b88b099 | 2615 | *val += *(u32 *)((void *)kvm + offset); |
e935b837 | 2616 | raw_spin_unlock(&kvm_lock); |
8b88b099 | 2617 | return 0; |
ba1389b7 AK |
2618 | } |
2619 | ||
2620 | DEFINE_SIMPLE_ATTRIBUTE(vm_stat_fops, vm_stat_get, NULL, "%llu\n"); | |
2621 | ||
8b88b099 | 2622 | static int vcpu_stat_get(void *_offset, u64 *val) |
1165f5fe AK |
2623 | { |
2624 | unsigned offset = (long)_offset; | |
1165f5fe AK |
2625 | struct kvm *kvm; |
2626 | struct kvm_vcpu *vcpu; | |
2627 | int i; | |
2628 | ||
8b88b099 | 2629 | *val = 0; |
e935b837 | 2630 | raw_spin_lock(&kvm_lock); |
1165f5fe | 2631 | list_for_each_entry(kvm, &vm_list, vm_list) |
988a2cae GN |
2632 | kvm_for_each_vcpu(i, vcpu, kvm) |
2633 | *val += *(u32 *)((void *)vcpu + offset); | |
2634 | ||
e935b837 | 2635 | raw_spin_unlock(&kvm_lock); |
8b88b099 | 2636 | return 0; |
1165f5fe AK |
2637 | } |
2638 | ||
ba1389b7 AK |
2639 | DEFINE_SIMPLE_ATTRIBUTE(vcpu_stat_fops, vcpu_stat_get, NULL, "%llu\n"); |
2640 | ||
828c0950 | 2641 | static const struct file_operations *stat_fops[] = { |
ba1389b7 AK |
2642 | [KVM_STAT_VCPU] = &vcpu_stat_fops, |
2643 | [KVM_STAT_VM] = &vm_stat_fops, | |
2644 | }; | |
1165f5fe | 2645 | |
4f69b680 | 2646 | static int kvm_init_debug(void) |
6aa8b732 | 2647 | { |
4f69b680 | 2648 | int r = -EFAULT; |
6aa8b732 AK |
2649 | struct kvm_stats_debugfs_item *p; |
2650 | ||
76f7c879 | 2651 | kvm_debugfs_dir = debugfs_create_dir("kvm", NULL); |
4f69b680 H |
2652 | if (kvm_debugfs_dir == NULL) |
2653 | goto out; | |
2654 | ||
2655 | for (p = debugfs_entries; p->name; ++p) { | |
76f7c879 | 2656 | p->dentry = debugfs_create_file(p->name, 0444, kvm_debugfs_dir, |
1165f5fe | 2657 | (void *)(long)p->offset, |
ba1389b7 | 2658 | stat_fops[p->kind]); |
4f69b680 H |
2659 | if (p->dentry == NULL) |
2660 | goto out_dir; | |
2661 | } | |
2662 | ||
2663 | return 0; | |
2664 | ||
2665 | out_dir: | |
2666 | debugfs_remove_recursive(kvm_debugfs_dir); | |
2667 | out: | |
2668 | return r; | |
6aa8b732 AK |
2669 | } |
2670 | ||
2671 | static void kvm_exit_debug(void) | |
2672 | { | |
2673 | struct kvm_stats_debugfs_item *p; | |
2674 | ||
2675 | for (p = debugfs_entries; p->name; ++p) | |
2676 | debugfs_remove(p->dentry); | |
76f7c879 | 2677 | debugfs_remove(kvm_debugfs_dir); |
6aa8b732 AK |
2678 | } |
2679 | ||
fb3600cc | 2680 | static int kvm_suspend(void) |
59ae6c6b | 2681 | { |
10474ae8 | 2682 | if (kvm_usage_count) |
75b7127c | 2683 | hardware_disable_nolock(NULL); |
59ae6c6b AK |
2684 | return 0; |
2685 | } | |
2686 | ||
fb3600cc | 2687 | static void kvm_resume(void) |
59ae6c6b | 2688 | { |
ca84d1a2 | 2689 | if (kvm_usage_count) { |
e935b837 | 2690 | WARN_ON(raw_spin_is_locked(&kvm_lock)); |
75b7127c | 2691 | hardware_enable_nolock(NULL); |
ca84d1a2 | 2692 | } |
59ae6c6b AK |
2693 | } |
2694 | ||
fb3600cc | 2695 | static struct syscore_ops kvm_syscore_ops = { |
59ae6c6b AK |
2696 | .suspend = kvm_suspend, |
2697 | .resume = kvm_resume, | |
2698 | }; | |
2699 | ||
cea7bb21 | 2700 | struct page *bad_page; |
35149e21 | 2701 | pfn_t bad_pfn; |
6aa8b732 | 2702 | |
15ad7146 AK |
2703 | static inline |
2704 | struct kvm_vcpu *preempt_notifier_to_vcpu(struct preempt_notifier *pn) | |
2705 | { | |
2706 | return container_of(pn, struct kvm_vcpu, preempt_notifier); | |
2707 | } | |
2708 | ||
2709 | static void kvm_sched_in(struct preempt_notifier *pn, int cpu) | |
2710 | { | |
2711 | struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn); | |
2712 | ||
e9b11c17 | 2713 | kvm_arch_vcpu_load(vcpu, cpu); |
15ad7146 AK |
2714 | } |
2715 | ||
2716 | static void kvm_sched_out(struct preempt_notifier *pn, | |
2717 | struct task_struct *next) | |
2718 | { | |
2719 | struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn); | |
2720 | ||
e9b11c17 | 2721 | kvm_arch_vcpu_put(vcpu); |
15ad7146 AK |
2722 | } |
2723 | ||
0ee75bea | 2724 | int kvm_init(void *opaque, unsigned vcpu_size, unsigned vcpu_align, |
c16f862d | 2725 | struct module *module) |
6aa8b732 AK |
2726 | { |
2727 | int r; | |
002c7f7c | 2728 | int cpu; |
6aa8b732 | 2729 | |
f8c16bba ZX |
2730 | r = kvm_arch_init(opaque); |
2731 | if (r) | |
d2308784 | 2732 | goto out_fail; |
cb498ea2 ZX |
2733 | |
2734 | bad_page = alloc_page(GFP_KERNEL | __GFP_ZERO); | |
2735 | ||
2736 | if (bad_page == NULL) { | |
2737 | r = -ENOMEM; | |
2738 | goto out; | |
2739 | } | |
2740 | ||
35149e21 AL |
2741 | bad_pfn = page_to_pfn(bad_page); |
2742 | ||
bf998156 HY |
2743 | hwpoison_page = alloc_page(GFP_KERNEL | __GFP_ZERO); |
2744 | ||
2745 | if (hwpoison_page == NULL) { | |
2746 | r = -ENOMEM; | |
2747 | goto out_free_0; | |
2748 | } | |
2749 | ||
2750 | hwpoison_pfn = page_to_pfn(hwpoison_page); | |
2751 | ||
edba23e5 GN |
2752 | fault_page = alloc_page(GFP_KERNEL | __GFP_ZERO); |
2753 | ||
2754 | if (fault_page == NULL) { | |
2755 | r = -ENOMEM; | |
2756 | goto out_free_0; | |
2757 | } | |
2758 | ||
2759 | fault_pfn = page_to_pfn(fault_page); | |
2760 | ||
8437a617 | 2761 | if (!zalloc_cpumask_var(&cpus_hardware_enabled, GFP_KERNEL)) { |
7f59f492 RR |
2762 | r = -ENOMEM; |
2763 | goto out_free_0; | |
2764 | } | |
2765 | ||
e9b11c17 | 2766 | r = kvm_arch_hardware_setup(); |
6aa8b732 | 2767 | if (r < 0) |
7f59f492 | 2768 | goto out_free_0a; |
6aa8b732 | 2769 | |
002c7f7c YS |
2770 | for_each_online_cpu(cpu) { |
2771 | smp_call_function_single(cpu, | |
e9b11c17 | 2772 | kvm_arch_check_processor_compat, |
8691e5a8 | 2773 | &r, 1); |
002c7f7c | 2774 | if (r < 0) |
d2308784 | 2775 | goto out_free_1; |
002c7f7c YS |
2776 | } |
2777 | ||
774c47f1 AK |
2778 | r = register_cpu_notifier(&kvm_cpu_notifier); |
2779 | if (r) | |
d2308784 | 2780 | goto out_free_2; |
6aa8b732 AK |
2781 | register_reboot_notifier(&kvm_reboot_notifier); |
2782 | ||
c16f862d | 2783 | /* A kmem cache lets us meet the alignment requirements of fx_save. */ |
0ee75bea AK |
2784 | if (!vcpu_align) |
2785 | vcpu_align = __alignof__(struct kvm_vcpu); | |
2786 | kvm_vcpu_cache = kmem_cache_create("kvm_vcpu", vcpu_size, vcpu_align, | |
56919c5c | 2787 | 0, NULL); |
c16f862d RR |
2788 | if (!kvm_vcpu_cache) { |
2789 | r = -ENOMEM; | |
fb3600cc | 2790 | goto out_free_3; |
c16f862d RR |
2791 | } |
2792 | ||
af585b92 GN |
2793 | r = kvm_async_pf_init(); |
2794 | if (r) | |
2795 | goto out_free; | |
2796 | ||
6aa8b732 | 2797 | kvm_chardev_ops.owner = module; |
3d3aab1b CB |
2798 | kvm_vm_fops.owner = module; |
2799 | kvm_vcpu_fops.owner = module; | |
6aa8b732 AK |
2800 | |
2801 | r = misc_register(&kvm_dev); | |
2802 | if (r) { | |
d77c26fc | 2803 | printk(KERN_ERR "kvm: misc device register failed\n"); |
af585b92 | 2804 | goto out_unreg; |
6aa8b732 AK |
2805 | } |
2806 | ||
fb3600cc RW |
2807 | register_syscore_ops(&kvm_syscore_ops); |
2808 | ||
15ad7146 AK |
2809 | kvm_preempt_ops.sched_in = kvm_sched_in; |
2810 | kvm_preempt_ops.sched_out = kvm_sched_out; | |
2811 | ||
4f69b680 H |
2812 | r = kvm_init_debug(); |
2813 | if (r) { | |
2814 | printk(KERN_ERR "kvm: create debugfs files failed\n"); | |
2815 | goto out_undebugfs; | |
2816 | } | |
0ea4ed8e | 2817 | |
c7addb90 | 2818 | return 0; |
6aa8b732 | 2819 | |
4f69b680 H |
2820 | out_undebugfs: |
2821 | unregister_syscore_ops(&kvm_syscore_ops); | |
af585b92 GN |
2822 | out_unreg: |
2823 | kvm_async_pf_deinit(); | |
6aa8b732 | 2824 | out_free: |
c16f862d | 2825 | kmem_cache_destroy(kvm_vcpu_cache); |
d2308784 | 2826 | out_free_3: |
6aa8b732 | 2827 | unregister_reboot_notifier(&kvm_reboot_notifier); |
774c47f1 | 2828 | unregister_cpu_notifier(&kvm_cpu_notifier); |
d2308784 | 2829 | out_free_2: |
d2308784 | 2830 | out_free_1: |
e9b11c17 | 2831 | kvm_arch_hardware_unsetup(); |
7f59f492 RR |
2832 | out_free_0a: |
2833 | free_cpumask_var(cpus_hardware_enabled); | |
d2308784 | 2834 | out_free_0: |
edba23e5 GN |
2835 | if (fault_page) |
2836 | __free_page(fault_page); | |
bf998156 HY |
2837 | if (hwpoison_page) |
2838 | __free_page(hwpoison_page); | |
d2308784 | 2839 | __free_page(bad_page); |
ca45aaae | 2840 | out: |
f8c16bba | 2841 | kvm_arch_exit(); |
d2308784 | 2842 | out_fail: |
6aa8b732 AK |
2843 | return r; |
2844 | } | |
cb498ea2 | 2845 | EXPORT_SYMBOL_GPL(kvm_init); |
6aa8b732 | 2846 | |
cb498ea2 | 2847 | void kvm_exit(void) |
6aa8b732 | 2848 | { |
0ea4ed8e | 2849 | kvm_exit_debug(); |
6aa8b732 | 2850 | misc_deregister(&kvm_dev); |
c16f862d | 2851 | kmem_cache_destroy(kvm_vcpu_cache); |
af585b92 | 2852 | kvm_async_pf_deinit(); |
fb3600cc | 2853 | unregister_syscore_ops(&kvm_syscore_ops); |
6aa8b732 | 2854 | unregister_reboot_notifier(&kvm_reboot_notifier); |
59ae6c6b | 2855 | unregister_cpu_notifier(&kvm_cpu_notifier); |
75b7127c | 2856 | on_each_cpu(hardware_disable_nolock, NULL, 1); |
e9b11c17 | 2857 | kvm_arch_hardware_unsetup(); |
f8c16bba | 2858 | kvm_arch_exit(); |
7f59f492 | 2859 | free_cpumask_var(cpus_hardware_enabled); |
bf998156 | 2860 | __free_page(hwpoison_page); |
cea7bb21 | 2861 | __free_page(bad_page); |
6aa8b732 | 2862 | } |
cb498ea2 | 2863 | EXPORT_SYMBOL_GPL(kvm_exit); |