Commit | Line | Data |
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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 | ||
a2766325 | 103 | bool kvm_is_mmio_pfn(pfn_t pfn) |
cbff90a7 | 104 | { |
fc5659c8 | 105 | if (pfn_valid(pfn)) { |
22e5c47e | 106 | int reserved; |
936a5fe6 | 107 | struct page *tail = pfn_to_page(pfn); |
22e5c47e AA |
108 | struct page *head = compound_trans_head(tail); |
109 | reserved = PageReserved(head); | |
936a5fe6 | 110 | if (head != tail) { |
936a5fe6 | 111 | /* |
22e5c47e AA |
112 | * "head" is not a dangling pointer |
113 | * (compound_trans_head takes care of that) | |
114 | * but the hugepage may have been splitted | |
115 | * from under us (and we may not hold a | |
116 | * reference count on the head page so it can | |
117 | * be reused before we run PageReferenced), so | |
118 | * we've to check PageTail before returning | |
119 | * what we just read. | |
936a5fe6 | 120 | */ |
22e5c47e AA |
121 | smp_rmb(); |
122 | if (PageTail(tail)) | |
123 | return reserved; | |
936a5fe6 AA |
124 | } |
125 | return PageReserved(tail); | |
fc5659c8 | 126 | } |
cbff90a7 BAY |
127 | |
128 | return true; | |
129 | } | |
130 | ||
bccf2150 AK |
131 | /* |
132 | * Switches to specified vcpu, until a matching vcpu_put() | |
133 | */ | |
9fc77441 | 134 | int vcpu_load(struct kvm_vcpu *vcpu) |
6aa8b732 | 135 | { |
15ad7146 AK |
136 | int cpu; |
137 | ||
9fc77441 MT |
138 | if (mutex_lock_killable(&vcpu->mutex)) |
139 | return -EINTR; | |
34bb10b7 RR |
140 | if (unlikely(vcpu->pid != current->pids[PIDTYPE_PID].pid)) { |
141 | /* The thread running this VCPU changed. */ | |
142 | struct pid *oldpid = vcpu->pid; | |
143 | struct pid *newpid = get_task_pid(current, PIDTYPE_PID); | |
144 | rcu_assign_pointer(vcpu->pid, newpid); | |
145 | synchronize_rcu(); | |
146 | put_pid(oldpid); | |
147 | } | |
15ad7146 AK |
148 | cpu = get_cpu(); |
149 | preempt_notifier_register(&vcpu->preempt_notifier); | |
313a3dc7 | 150 | kvm_arch_vcpu_load(vcpu, cpu); |
15ad7146 | 151 | put_cpu(); |
9fc77441 | 152 | return 0; |
6aa8b732 AK |
153 | } |
154 | ||
313a3dc7 | 155 | void vcpu_put(struct kvm_vcpu *vcpu) |
6aa8b732 | 156 | { |
15ad7146 | 157 | preempt_disable(); |
313a3dc7 | 158 | kvm_arch_vcpu_put(vcpu); |
15ad7146 AK |
159 | preempt_notifier_unregister(&vcpu->preempt_notifier); |
160 | preempt_enable(); | |
6aa8b732 AK |
161 | mutex_unlock(&vcpu->mutex); |
162 | } | |
163 | ||
d9e368d6 AK |
164 | static void ack_flush(void *_completed) |
165 | { | |
d9e368d6 AK |
166 | } |
167 | ||
49846896 | 168 | static bool make_all_cpus_request(struct kvm *kvm, unsigned int req) |
d9e368d6 | 169 | { |
597a5f55 | 170 | int i, cpu, me; |
6ef7a1bc RR |
171 | cpumask_var_t cpus; |
172 | bool called = true; | |
d9e368d6 | 173 | struct kvm_vcpu *vcpu; |
d9e368d6 | 174 | |
79f55997 | 175 | zalloc_cpumask_var(&cpus, GFP_ATOMIC); |
6ef7a1bc | 176 | |
3cba4130 | 177 | me = get_cpu(); |
988a2cae | 178 | kvm_for_each_vcpu(i, vcpu, kvm) { |
3cba4130 | 179 | kvm_make_request(req, vcpu); |
d9e368d6 | 180 | cpu = vcpu->cpu; |
6b7e2d09 XG |
181 | |
182 | /* Set ->requests bit before we read ->mode */ | |
183 | smp_mb(); | |
184 | ||
185 | if (cpus != NULL && cpu != -1 && cpu != me && | |
186 | kvm_vcpu_exiting_guest_mode(vcpu) != OUTSIDE_GUEST_MODE) | |
6ef7a1bc | 187 | cpumask_set_cpu(cpu, cpus); |
49846896 | 188 | } |
6ef7a1bc RR |
189 | if (unlikely(cpus == NULL)) |
190 | smp_call_function_many(cpu_online_mask, ack_flush, NULL, 1); | |
191 | else if (!cpumask_empty(cpus)) | |
192 | smp_call_function_many(cpus, ack_flush, NULL, 1); | |
193 | else | |
194 | called = false; | |
3cba4130 | 195 | put_cpu(); |
6ef7a1bc | 196 | free_cpumask_var(cpus); |
49846896 | 197 | return called; |
d9e368d6 AK |
198 | } |
199 | ||
49846896 | 200 | void kvm_flush_remote_tlbs(struct kvm *kvm) |
2e53d63a | 201 | { |
bec87d6e | 202 | long dirty_count = kvm->tlbs_dirty; |
a4ee1ca4 XG |
203 | |
204 | smp_mb(); | |
49846896 RR |
205 | if (make_all_cpus_request(kvm, KVM_REQ_TLB_FLUSH)) |
206 | ++kvm->stat.remote_tlb_flush; | |
a4ee1ca4 | 207 | cmpxchg(&kvm->tlbs_dirty, dirty_count, 0); |
2e53d63a MT |
208 | } |
209 | ||
49846896 RR |
210 | void kvm_reload_remote_mmus(struct kvm *kvm) |
211 | { | |
212 | make_all_cpus_request(kvm, KVM_REQ_MMU_RELOAD); | |
213 | } | |
2e53d63a | 214 | |
d828199e MT |
215 | void kvm_make_mclock_inprogress_request(struct kvm *kvm) |
216 | { | |
217 | make_all_cpus_request(kvm, KVM_REQ_MCLOCK_INPROGRESS); | |
218 | } | |
219 | ||
c7c9c56c YZ |
220 | void kvm_make_update_eoibitmap_request(struct kvm *kvm) |
221 | { | |
222 | make_all_cpus_request(kvm, KVM_REQ_EOIBITMAP); | |
223 | } | |
224 | ||
fb3f0f51 RR |
225 | int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id) |
226 | { | |
227 | struct page *page; | |
228 | int r; | |
229 | ||
230 | mutex_init(&vcpu->mutex); | |
231 | vcpu->cpu = -1; | |
fb3f0f51 RR |
232 | vcpu->kvm = kvm; |
233 | vcpu->vcpu_id = id; | |
34bb10b7 | 234 | vcpu->pid = NULL; |
b6958ce4 | 235 | init_waitqueue_head(&vcpu->wq); |
af585b92 | 236 | kvm_async_pf_vcpu_init(vcpu); |
fb3f0f51 RR |
237 | |
238 | page = alloc_page(GFP_KERNEL | __GFP_ZERO); | |
239 | if (!page) { | |
240 | r = -ENOMEM; | |
241 | goto fail; | |
242 | } | |
243 | vcpu->run = page_address(page); | |
244 | ||
4c088493 R |
245 | kvm_vcpu_set_in_spin_loop(vcpu, false); |
246 | kvm_vcpu_set_dy_eligible(vcpu, false); | |
247 | ||
e9b11c17 | 248 | r = kvm_arch_vcpu_init(vcpu); |
fb3f0f51 | 249 | if (r < 0) |
e9b11c17 | 250 | goto fail_free_run; |
fb3f0f51 RR |
251 | return 0; |
252 | ||
fb3f0f51 RR |
253 | fail_free_run: |
254 | free_page((unsigned long)vcpu->run); | |
255 | fail: | |
76fafa5e | 256 | return r; |
fb3f0f51 RR |
257 | } |
258 | EXPORT_SYMBOL_GPL(kvm_vcpu_init); | |
259 | ||
260 | void kvm_vcpu_uninit(struct kvm_vcpu *vcpu) | |
261 | { | |
34bb10b7 | 262 | put_pid(vcpu->pid); |
e9b11c17 | 263 | kvm_arch_vcpu_uninit(vcpu); |
fb3f0f51 RR |
264 | free_page((unsigned long)vcpu->run); |
265 | } | |
266 | EXPORT_SYMBOL_GPL(kvm_vcpu_uninit); | |
267 | ||
e930bffe AA |
268 | #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER) |
269 | static inline struct kvm *mmu_notifier_to_kvm(struct mmu_notifier *mn) | |
270 | { | |
271 | return container_of(mn, struct kvm, mmu_notifier); | |
272 | } | |
273 | ||
274 | static void kvm_mmu_notifier_invalidate_page(struct mmu_notifier *mn, | |
275 | struct mm_struct *mm, | |
276 | unsigned long address) | |
277 | { | |
278 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
bc6678a3 | 279 | int need_tlb_flush, idx; |
e930bffe AA |
280 | |
281 | /* | |
282 | * When ->invalidate_page runs, the linux pte has been zapped | |
283 | * already but the page is still allocated until | |
284 | * ->invalidate_page returns. So if we increase the sequence | |
285 | * here the kvm page fault will notice if the spte can't be | |
286 | * established because the page is going to be freed. If | |
287 | * instead the kvm page fault establishes the spte before | |
288 | * ->invalidate_page runs, kvm_unmap_hva will release it | |
289 | * before returning. | |
290 | * | |
291 | * The sequence increase only need to be seen at spin_unlock | |
292 | * time, and not at spin_lock time. | |
293 | * | |
294 | * Increasing the sequence after the spin_unlock would be | |
295 | * unsafe because the kvm page fault could then establish the | |
296 | * pte after kvm_unmap_hva returned, without noticing the page | |
297 | * is going to be freed. | |
298 | */ | |
bc6678a3 | 299 | idx = srcu_read_lock(&kvm->srcu); |
e930bffe | 300 | spin_lock(&kvm->mmu_lock); |
565f3be2 | 301 | |
e930bffe | 302 | kvm->mmu_notifier_seq++; |
a4ee1ca4 | 303 | need_tlb_flush = kvm_unmap_hva(kvm, address) | kvm->tlbs_dirty; |
e930bffe AA |
304 | /* we've to flush the tlb before the pages can be freed */ |
305 | if (need_tlb_flush) | |
306 | kvm_flush_remote_tlbs(kvm); | |
307 | ||
565f3be2 TY |
308 | spin_unlock(&kvm->mmu_lock); |
309 | srcu_read_unlock(&kvm->srcu, idx); | |
e930bffe AA |
310 | } |
311 | ||
3da0dd43 IE |
312 | static void kvm_mmu_notifier_change_pte(struct mmu_notifier *mn, |
313 | struct mm_struct *mm, | |
314 | unsigned long address, | |
315 | pte_t pte) | |
316 | { | |
317 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
bc6678a3 | 318 | int idx; |
3da0dd43 | 319 | |
bc6678a3 | 320 | idx = srcu_read_lock(&kvm->srcu); |
3da0dd43 IE |
321 | spin_lock(&kvm->mmu_lock); |
322 | kvm->mmu_notifier_seq++; | |
323 | kvm_set_spte_hva(kvm, address, pte); | |
324 | spin_unlock(&kvm->mmu_lock); | |
bc6678a3 | 325 | srcu_read_unlock(&kvm->srcu, idx); |
3da0dd43 IE |
326 | } |
327 | ||
e930bffe AA |
328 | static void kvm_mmu_notifier_invalidate_range_start(struct mmu_notifier *mn, |
329 | struct mm_struct *mm, | |
330 | unsigned long start, | |
331 | unsigned long end) | |
332 | { | |
333 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
bc6678a3 | 334 | int need_tlb_flush = 0, idx; |
e930bffe | 335 | |
bc6678a3 | 336 | idx = srcu_read_lock(&kvm->srcu); |
e930bffe AA |
337 | spin_lock(&kvm->mmu_lock); |
338 | /* | |
339 | * The count increase must become visible at unlock time as no | |
340 | * spte can be established without taking the mmu_lock and | |
341 | * count is also read inside the mmu_lock critical section. | |
342 | */ | |
343 | kvm->mmu_notifier_count++; | |
b3ae2096 | 344 | need_tlb_flush = kvm_unmap_hva_range(kvm, start, end); |
a4ee1ca4 | 345 | need_tlb_flush |= kvm->tlbs_dirty; |
e930bffe AA |
346 | /* we've to flush the tlb before the pages can be freed */ |
347 | if (need_tlb_flush) | |
348 | kvm_flush_remote_tlbs(kvm); | |
565f3be2 TY |
349 | |
350 | spin_unlock(&kvm->mmu_lock); | |
351 | srcu_read_unlock(&kvm->srcu, idx); | |
e930bffe AA |
352 | } |
353 | ||
354 | static void kvm_mmu_notifier_invalidate_range_end(struct mmu_notifier *mn, | |
355 | struct mm_struct *mm, | |
356 | unsigned long start, | |
357 | unsigned long end) | |
358 | { | |
359 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
360 | ||
361 | spin_lock(&kvm->mmu_lock); | |
362 | /* | |
363 | * This sequence increase will notify the kvm page fault that | |
364 | * the page that is going to be mapped in the spte could have | |
365 | * been freed. | |
366 | */ | |
367 | kvm->mmu_notifier_seq++; | |
a355aa54 | 368 | smp_wmb(); |
e930bffe AA |
369 | /* |
370 | * The above sequence increase must be visible before the | |
a355aa54 PM |
371 | * below count decrease, which is ensured by the smp_wmb above |
372 | * in conjunction with the smp_rmb in mmu_notifier_retry(). | |
e930bffe AA |
373 | */ |
374 | kvm->mmu_notifier_count--; | |
375 | spin_unlock(&kvm->mmu_lock); | |
376 | ||
377 | BUG_ON(kvm->mmu_notifier_count < 0); | |
378 | } | |
379 | ||
380 | static int kvm_mmu_notifier_clear_flush_young(struct mmu_notifier *mn, | |
381 | struct mm_struct *mm, | |
382 | unsigned long address) | |
383 | { | |
384 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
bc6678a3 | 385 | int young, idx; |
e930bffe | 386 | |
bc6678a3 | 387 | idx = srcu_read_lock(&kvm->srcu); |
e930bffe | 388 | spin_lock(&kvm->mmu_lock); |
e930bffe | 389 | |
565f3be2 | 390 | young = kvm_age_hva(kvm, address); |
e930bffe AA |
391 | if (young) |
392 | kvm_flush_remote_tlbs(kvm); | |
393 | ||
565f3be2 TY |
394 | spin_unlock(&kvm->mmu_lock); |
395 | srcu_read_unlock(&kvm->srcu, idx); | |
396 | ||
e930bffe AA |
397 | return young; |
398 | } | |
399 | ||
8ee53820 AA |
400 | static int kvm_mmu_notifier_test_young(struct mmu_notifier *mn, |
401 | struct mm_struct *mm, | |
402 | unsigned long address) | |
403 | { | |
404 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
405 | int young, idx; | |
406 | ||
407 | idx = srcu_read_lock(&kvm->srcu); | |
408 | spin_lock(&kvm->mmu_lock); | |
409 | young = kvm_test_age_hva(kvm, address); | |
410 | spin_unlock(&kvm->mmu_lock); | |
411 | srcu_read_unlock(&kvm->srcu, idx); | |
412 | ||
413 | return young; | |
414 | } | |
415 | ||
85db06e5 MT |
416 | static void kvm_mmu_notifier_release(struct mmu_notifier *mn, |
417 | struct mm_struct *mm) | |
418 | { | |
419 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
eda2beda LJ |
420 | int idx; |
421 | ||
422 | idx = srcu_read_lock(&kvm->srcu); | |
2df72e9b | 423 | kvm_arch_flush_shadow_all(kvm); |
eda2beda | 424 | srcu_read_unlock(&kvm->srcu, idx); |
85db06e5 MT |
425 | } |
426 | ||
e930bffe AA |
427 | static const struct mmu_notifier_ops kvm_mmu_notifier_ops = { |
428 | .invalidate_page = kvm_mmu_notifier_invalidate_page, | |
429 | .invalidate_range_start = kvm_mmu_notifier_invalidate_range_start, | |
430 | .invalidate_range_end = kvm_mmu_notifier_invalidate_range_end, | |
431 | .clear_flush_young = kvm_mmu_notifier_clear_flush_young, | |
8ee53820 | 432 | .test_young = kvm_mmu_notifier_test_young, |
3da0dd43 | 433 | .change_pte = kvm_mmu_notifier_change_pte, |
85db06e5 | 434 | .release = kvm_mmu_notifier_release, |
e930bffe | 435 | }; |
4c07b0a4 AK |
436 | |
437 | static int kvm_init_mmu_notifier(struct kvm *kvm) | |
438 | { | |
439 | kvm->mmu_notifier.ops = &kvm_mmu_notifier_ops; | |
440 | return mmu_notifier_register(&kvm->mmu_notifier, current->mm); | |
441 | } | |
442 | ||
443 | #else /* !(CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER) */ | |
444 | ||
445 | static int kvm_init_mmu_notifier(struct kvm *kvm) | |
446 | { | |
447 | return 0; | |
448 | } | |
449 | ||
e930bffe AA |
450 | #endif /* CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER */ |
451 | ||
bf3e05bc XG |
452 | static void kvm_init_memslots_id(struct kvm *kvm) |
453 | { | |
454 | int i; | |
455 | struct kvm_memslots *slots = kvm->memslots; | |
456 | ||
457 | for (i = 0; i < KVM_MEM_SLOTS_NUM; i++) | |
f85e2cb5 | 458 | slots->id_to_index[i] = slots->memslots[i].id = i; |
bf3e05bc XG |
459 | } |
460 | ||
e08b9637 | 461 | static struct kvm *kvm_create_vm(unsigned long type) |
6aa8b732 | 462 | { |
d89f5eff JK |
463 | int r, i; |
464 | struct kvm *kvm = kvm_arch_alloc_vm(); | |
6aa8b732 | 465 | |
d89f5eff JK |
466 | if (!kvm) |
467 | return ERR_PTR(-ENOMEM); | |
468 | ||
e08b9637 | 469 | r = kvm_arch_init_vm(kvm, type); |
d89f5eff JK |
470 | if (r) |
471 | goto out_err_nodisable; | |
10474ae8 AG |
472 | |
473 | r = hardware_enable_all(); | |
474 | if (r) | |
475 | goto out_err_nodisable; | |
476 | ||
75858a84 AK |
477 | #ifdef CONFIG_HAVE_KVM_IRQCHIP |
478 | INIT_HLIST_HEAD(&kvm->mask_notifier_list); | |
136bdfee | 479 | INIT_HLIST_HEAD(&kvm->irq_ack_notifier_list); |
75858a84 | 480 | #endif |
6aa8b732 | 481 | |
1e702d9a AW |
482 | BUILD_BUG_ON(KVM_MEM_SLOTS_NUM > SHRT_MAX); |
483 | ||
46a26bf5 MT |
484 | r = -ENOMEM; |
485 | kvm->memslots = kzalloc(sizeof(struct kvm_memslots), GFP_KERNEL); | |
486 | if (!kvm->memslots) | |
57e7fbee | 487 | goto out_err_nosrcu; |
bf3e05bc | 488 | kvm_init_memslots_id(kvm); |
bc6678a3 | 489 | if (init_srcu_struct(&kvm->srcu)) |
57e7fbee | 490 | goto out_err_nosrcu; |
e93f8a0f MT |
491 | for (i = 0; i < KVM_NR_BUSES; i++) { |
492 | kvm->buses[i] = kzalloc(sizeof(struct kvm_io_bus), | |
493 | GFP_KERNEL); | |
57e7fbee | 494 | if (!kvm->buses[i]) |
e93f8a0f | 495 | goto out_err; |
e93f8a0f | 496 | } |
e930bffe | 497 | |
74b5c5bf | 498 | spin_lock_init(&kvm->mmu_lock); |
6d4e4c4f AK |
499 | kvm->mm = current->mm; |
500 | atomic_inc(&kvm->mm->mm_count); | |
d34e6b17 | 501 | kvm_eventfd_init(kvm); |
11ec2804 | 502 | mutex_init(&kvm->lock); |
60eead79 | 503 | mutex_init(&kvm->irq_lock); |
79fac95e | 504 | mutex_init(&kvm->slots_lock); |
d39f13b0 | 505 | atomic_set(&kvm->users_count, 1); |
74b5c5bf MW |
506 | |
507 | r = kvm_init_mmu_notifier(kvm); | |
508 | if (r) | |
509 | goto out_err; | |
510 | ||
e935b837 | 511 | raw_spin_lock(&kvm_lock); |
5e58cfe4 | 512 | list_add(&kvm->vm_list, &vm_list); |
e935b837 | 513 | raw_spin_unlock(&kvm_lock); |
d89f5eff | 514 | |
f17abe9a | 515 | return kvm; |
10474ae8 AG |
516 | |
517 | out_err: | |
57e7fbee JK |
518 | cleanup_srcu_struct(&kvm->srcu); |
519 | out_err_nosrcu: | |
10474ae8 AG |
520 | hardware_disable_all(); |
521 | out_err_nodisable: | |
e93f8a0f MT |
522 | for (i = 0; i < KVM_NR_BUSES; i++) |
523 | kfree(kvm->buses[i]); | |
46a26bf5 | 524 | kfree(kvm->memslots); |
d89f5eff | 525 | kvm_arch_free_vm(kvm); |
10474ae8 | 526 | return ERR_PTR(r); |
f17abe9a AK |
527 | } |
528 | ||
92eca8fa TY |
529 | /* |
530 | * Avoid using vmalloc for a small buffer. | |
531 | * Should not be used when the size is statically known. | |
532 | */ | |
c1a7b32a | 533 | void *kvm_kvzalloc(unsigned long size) |
92eca8fa TY |
534 | { |
535 | if (size > PAGE_SIZE) | |
536 | return vzalloc(size); | |
537 | else | |
538 | return kzalloc(size, GFP_KERNEL); | |
539 | } | |
540 | ||
c1a7b32a | 541 | void kvm_kvfree(const void *addr) |
92eca8fa TY |
542 | { |
543 | if (is_vmalloc_addr(addr)) | |
544 | vfree(addr); | |
545 | else | |
546 | kfree(addr); | |
547 | } | |
548 | ||
a36a57b1 TY |
549 | static void kvm_destroy_dirty_bitmap(struct kvm_memory_slot *memslot) |
550 | { | |
551 | if (!memslot->dirty_bitmap) | |
552 | return; | |
553 | ||
92eca8fa | 554 | kvm_kvfree(memslot->dirty_bitmap); |
a36a57b1 TY |
555 | memslot->dirty_bitmap = NULL; |
556 | } | |
557 | ||
6aa8b732 AK |
558 | /* |
559 | * Free any memory in @free but not in @dont. | |
560 | */ | |
561 | static void kvm_free_physmem_slot(struct kvm_memory_slot *free, | |
562 | struct kvm_memory_slot *dont) | |
563 | { | |
6aa8b732 | 564 | if (!dont || free->dirty_bitmap != dont->dirty_bitmap) |
a36a57b1 | 565 | kvm_destroy_dirty_bitmap(free); |
6aa8b732 | 566 | |
db3fe4eb | 567 | kvm_arch_free_memslot(free, dont); |
05da4558 | 568 | |
6aa8b732 | 569 | free->npages = 0; |
6aa8b732 AK |
570 | } |
571 | ||
d19a9cd2 | 572 | void kvm_free_physmem(struct kvm *kvm) |
6aa8b732 | 573 | { |
46a26bf5 | 574 | struct kvm_memslots *slots = kvm->memslots; |
be6ba0f0 | 575 | struct kvm_memory_slot *memslot; |
46a26bf5 | 576 | |
be6ba0f0 XG |
577 | kvm_for_each_memslot(memslot, slots) |
578 | kvm_free_physmem_slot(memslot, NULL); | |
6aa8b732 | 579 | |
46a26bf5 | 580 | kfree(kvm->memslots); |
6aa8b732 AK |
581 | } |
582 | ||
f17abe9a AK |
583 | static void kvm_destroy_vm(struct kvm *kvm) |
584 | { | |
e93f8a0f | 585 | int i; |
6d4e4c4f AK |
586 | struct mm_struct *mm = kvm->mm; |
587 | ||
ad8ba2cd | 588 | kvm_arch_sync_events(kvm); |
e935b837 | 589 | raw_spin_lock(&kvm_lock); |
133de902 | 590 | list_del(&kvm->vm_list); |
e935b837 | 591 | raw_spin_unlock(&kvm_lock); |
399ec807 | 592 | kvm_free_irq_routing(kvm); |
e93f8a0f MT |
593 | for (i = 0; i < KVM_NR_BUSES; i++) |
594 | kvm_io_bus_destroy(kvm->buses[i]); | |
980da6ce | 595 | kvm_coalesced_mmio_free(kvm); |
e930bffe AA |
596 | #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER) |
597 | mmu_notifier_unregister(&kvm->mmu_notifier, kvm->mm); | |
f00be0ca | 598 | #else |
2df72e9b | 599 | kvm_arch_flush_shadow_all(kvm); |
5f94c174 | 600 | #endif |
d19a9cd2 | 601 | kvm_arch_destroy_vm(kvm); |
d89f5eff JK |
602 | kvm_free_physmem(kvm); |
603 | cleanup_srcu_struct(&kvm->srcu); | |
604 | kvm_arch_free_vm(kvm); | |
10474ae8 | 605 | hardware_disable_all(); |
6d4e4c4f | 606 | mmdrop(mm); |
f17abe9a AK |
607 | } |
608 | ||
d39f13b0 IE |
609 | void kvm_get_kvm(struct kvm *kvm) |
610 | { | |
611 | atomic_inc(&kvm->users_count); | |
612 | } | |
613 | EXPORT_SYMBOL_GPL(kvm_get_kvm); | |
614 | ||
615 | void kvm_put_kvm(struct kvm *kvm) | |
616 | { | |
617 | if (atomic_dec_and_test(&kvm->users_count)) | |
618 | kvm_destroy_vm(kvm); | |
619 | } | |
620 | EXPORT_SYMBOL_GPL(kvm_put_kvm); | |
621 | ||
622 | ||
f17abe9a AK |
623 | static int kvm_vm_release(struct inode *inode, struct file *filp) |
624 | { | |
625 | struct kvm *kvm = filp->private_data; | |
626 | ||
721eecbf GH |
627 | kvm_irqfd_release(kvm); |
628 | ||
d39f13b0 | 629 | kvm_put_kvm(kvm); |
6aa8b732 AK |
630 | return 0; |
631 | } | |
632 | ||
515a0127 TY |
633 | /* |
634 | * Allocation size is twice as large as the actual dirty bitmap size. | |
93474b25 | 635 | * See x86's kvm_vm_ioctl_get_dirty_log() why this is needed. |
515a0127 | 636 | */ |
a36a57b1 TY |
637 | static int kvm_create_dirty_bitmap(struct kvm_memory_slot *memslot) |
638 | { | |
189a2f7b | 639 | #ifndef CONFIG_S390 |
515a0127 | 640 | unsigned long dirty_bytes = 2 * kvm_dirty_bitmap_bytes(memslot); |
a36a57b1 | 641 | |
92eca8fa | 642 | memslot->dirty_bitmap = kvm_kvzalloc(dirty_bytes); |
a36a57b1 TY |
643 | if (!memslot->dirty_bitmap) |
644 | return -ENOMEM; | |
645 | ||
189a2f7b | 646 | #endif /* !CONFIG_S390 */ |
a36a57b1 TY |
647 | return 0; |
648 | } | |
649 | ||
bf3e05bc XG |
650 | static int cmp_memslot(const void *slot1, const void *slot2) |
651 | { | |
652 | struct kvm_memory_slot *s1, *s2; | |
653 | ||
654 | s1 = (struct kvm_memory_slot *)slot1; | |
655 | s2 = (struct kvm_memory_slot *)slot2; | |
656 | ||
657 | if (s1->npages < s2->npages) | |
658 | return 1; | |
659 | if (s1->npages > s2->npages) | |
660 | return -1; | |
661 | ||
662 | return 0; | |
663 | } | |
664 | ||
665 | /* | |
666 | * Sort the memslots base on its size, so the larger slots | |
667 | * will get better fit. | |
668 | */ | |
669 | static void sort_memslots(struct kvm_memslots *slots) | |
670 | { | |
f85e2cb5 XG |
671 | int i; |
672 | ||
bf3e05bc XG |
673 | sort(slots->memslots, KVM_MEM_SLOTS_NUM, |
674 | sizeof(struct kvm_memory_slot), cmp_memslot, NULL); | |
f85e2cb5 XG |
675 | |
676 | for (i = 0; i < KVM_MEM_SLOTS_NUM; i++) | |
677 | slots->id_to_index[slots->memslots[i].id] = i; | |
bf3e05bc XG |
678 | } |
679 | ||
116c14c0 AW |
680 | void update_memslots(struct kvm_memslots *slots, struct kvm_memory_slot *new, |
681 | u64 last_generation) | |
be593d62 XG |
682 | { |
683 | if (new) { | |
684 | int id = new->id; | |
28a37544 | 685 | struct kvm_memory_slot *old = id_to_memslot(slots, id); |
bf3e05bc | 686 | unsigned long npages = old->npages; |
be593d62 | 687 | |
28a37544 | 688 | *old = *new; |
bf3e05bc XG |
689 | if (new->npages != npages) |
690 | sort_memslots(slots); | |
be593d62 XG |
691 | } |
692 | ||
116c14c0 | 693 | slots->generation = last_generation + 1; |
be593d62 XG |
694 | } |
695 | ||
a50d64d6 XG |
696 | static int check_memory_region_flags(struct kvm_userspace_memory_region *mem) |
697 | { | |
4d8b81ab XG |
698 | u32 valid_flags = KVM_MEM_LOG_DIRTY_PAGES; |
699 | ||
700 | #ifdef KVM_CAP_READONLY_MEM | |
701 | valid_flags |= KVM_MEM_READONLY; | |
702 | #endif | |
703 | ||
704 | if (mem->flags & ~valid_flags) | |
a50d64d6 XG |
705 | return -EINVAL; |
706 | ||
707 | return 0; | |
708 | } | |
709 | ||
7ec4fb44 GN |
710 | static struct kvm_memslots *install_new_memslots(struct kvm *kvm, |
711 | struct kvm_memslots *slots, struct kvm_memory_slot *new) | |
712 | { | |
713 | struct kvm_memslots *old_memslots = kvm->memslots; | |
714 | ||
715 | update_memslots(slots, new, kvm->memslots->generation); | |
716 | rcu_assign_pointer(kvm->memslots, slots); | |
717 | synchronize_srcu_expedited(&kvm->srcu); | |
718 | return old_memslots; | |
719 | } | |
720 | ||
f64c0398 TY |
721 | /* |
722 | * KVM_SET_USER_MEMORY_REGION ioctl allows the following operations: | |
723 | * - create a new memory slot | |
724 | * - delete an existing memory slot | |
725 | * - modify an existing memory slot | |
726 | * -- move it in the guest physical memory space | |
727 | * -- just change its flags | |
728 | * | |
729 | * Since flags can be changed by some of these operations, the following | |
730 | * differentiation is the best we can do for __kvm_set_memory_region(): | |
731 | */ | |
732 | enum kvm_mr_change { | |
733 | KVM_MR_CREATE, | |
734 | KVM_MR_DELETE, | |
735 | KVM_MR_MOVE, | |
736 | KVM_MR_FLAGS_ONLY, | |
737 | }; | |
738 | ||
6aa8b732 AK |
739 | /* |
740 | * Allocate some memory and give it an address in the guest physical address | |
741 | * space. | |
742 | * | |
743 | * Discontiguous memory is allowed, mostly for framebuffers. | |
f78e0e2e | 744 | * |
10589a46 | 745 | * Must be called holding mmap_sem for write. |
6aa8b732 | 746 | */ |
f78e0e2e SY |
747 | int __kvm_set_memory_region(struct kvm *kvm, |
748 | struct kvm_userspace_memory_region *mem, | |
f82a8cfe | 749 | bool user_alloc) |
6aa8b732 | 750 | { |
8234b22e | 751 | int r; |
6aa8b732 | 752 | gfn_t base_gfn; |
28bcb112 | 753 | unsigned long npages; |
a843fac2 | 754 | struct kvm_memory_slot *slot; |
6aa8b732 | 755 | struct kvm_memory_slot old, new; |
b7f69c55 | 756 | struct kvm_memslots *slots = NULL, *old_memslots; |
f64c0398 | 757 | enum kvm_mr_change change; |
6aa8b732 | 758 | |
a50d64d6 XG |
759 | r = check_memory_region_flags(mem); |
760 | if (r) | |
761 | goto out; | |
762 | ||
6aa8b732 AK |
763 | r = -EINVAL; |
764 | /* General sanity checks */ | |
765 | if (mem->memory_size & (PAGE_SIZE - 1)) | |
766 | goto out; | |
767 | if (mem->guest_phys_addr & (PAGE_SIZE - 1)) | |
768 | goto out; | |
fa3d315a TY |
769 | /* We can read the guest memory with __xxx_user() later on. */ |
770 | if (user_alloc && | |
771 | ((mem->userspace_addr & (PAGE_SIZE - 1)) || | |
9e3bb6b6 HC |
772 | !access_ok(VERIFY_WRITE, |
773 | (void __user *)(unsigned long)mem->userspace_addr, | |
774 | mem->memory_size))) | |
78749809 | 775 | goto out; |
93a5cef0 | 776 | if (mem->slot >= KVM_MEM_SLOTS_NUM) |
6aa8b732 AK |
777 | goto out; |
778 | if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr) | |
779 | goto out; | |
780 | ||
a843fac2 | 781 | slot = id_to_memslot(kvm->memslots, mem->slot); |
6aa8b732 AK |
782 | base_gfn = mem->guest_phys_addr >> PAGE_SHIFT; |
783 | npages = mem->memory_size >> PAGE_SHIFT; | |
784 | ||
660c22c4 TY |
785 | r = -EINVAL; |
786 | if (npages > KVM_MEM_MAX_NR_PAGES) | |
787 | goto out; | |
788 | ||
6aa8b732 AK |
789 | if (!npages) |
790 | mem->flags &= ~KVM_MEM_LOG_DIRTY_PAGES; | |
791 | ||
a843fac2 | 792 | new = old = *slot; |
6aa8b732 | 793 | |
e36d96f7 | 794 | new.id = mem->slot; |
6aa8b732 AK |
795 | new.base_gfn = base_gfn; |
796 | new.npages = npages; | |
797 | new.flags = mem->flags; | |
798 | ||
6aa8b732 | 799 | r = -EINVAL; |
f64c0398 TY |
800 | if (npages) { |
801 | if (!old.npages) | |
802 | change = KVM_MR_CREATE; | |
803 | else { /* Modify an existing slot. */ | |
804 | if ((mem->userspace_addr != old.userspace_addr) || | |
75d61fbc TY |
805 | (npages != old.npages) || |
806 | ((new.flags ^ old.flags) & KVM_MEM_READONLY)) | |
f64c0398 TY |
807 | goto out; |
808 | ||
809 | if (base_gfn != old.base_gfn) | |
810 | change = KVM_MR_MOVE; | |
811 | else if (new.flags != old.flags) | |
812 | change = KVM_MR_FLAGS_ONLY; | |
813 | else { /* Nothing to change. */ | |
814 | r = 0; | |
815 | goto out; | |
816 | } | |
817 | } | |
818 | } else if (old.npages) { | |
819 | change = KVM_MR_DELETE; | |
820 | } else /* Modify a non-existent slot: disallowed. */ | |
0ea75e1d | 821 | goto out; |
6aa8b732 | 822 | |
f64c0398 | 823 | if ((change == KVM_MR_CREATE) || (change == KVM_MR_MOVE)) { |
0a706bee TY |
824 | /* Check for overlaps */ |
825 | r = -EEXIST; | |
826 | kvm_for_each_memslot(slot, kvm->memslots) { | |
a843fac2 TY |
827 | if ((slot->id >= KVM_USER_MEM_SLOTS) || |
828 | (slot->id == mem->slot)) | |
0a706bee TY |
829 | continue; |
830 | if (!((base_gfn + npages <= slot->base_gfn) || | |
831 | (base_gfn >= slot->base_gfn + slot->npages))) | |
832 | goto out; | |
833 | } | |
6aa8b732 | 834 | } |
6aa8b732 | 835 | |
6aa8b732 AK |
836 | /* Free page dirty bitmap if unneeded */ |
837 | if (!(new.flags & KVM_MEM_LOG_DIRTY_PAGES)) | |
8b6d44c7 | 838 | new.dirty_bitmap = NULL; |
6aa8b732 AK |
839 | |
840 | r = -ENOMEM; | |
f64c0398 | 841 | if (change == KVM_MR_CREATE) { |
189a2f7b | 842 | new.userspace_addr = mem->userspace_addr; |
d89cc617 | 843 | |
db3fe4eb TY |
844 | if (kvm_arch_create_memslot(&new, npages)) |
845 | goto out_free; | |
6aa8b732 | 846 | } |
ec04b260 | 847 | |
6aa8b732 AK |
848 | /* Allocate page dirty bitmap if needed */ |
849 | if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) { | |
a36a57b1 | 850 | if (kvm_create_dirty_bitmap(&new) < 0) |
f78e0e2e | 851 | goto out_free; |
6aa8b732 AK |
852 | } |
853 | ||
f64c0398 | 854 | if ((change == KVM_MR_DELETE) || (change == KVM_MR_MOVE)) { |
bc6678a3 | 855 | r = -ENOMEM; |
6da64fdb TM |
856 | slots = kmemdup(kvm->memslots, sizeof(struct kvm_memslots), |
857 | GFP_KERNEL); | |
bc6678a3 MT |
858 | if (!slots) |
859 | goto out_free; | |
28a37544 XG |
860 | slot = id_to_memslot(slots, mem->slot); |
861 | slot->flags |= KVM_MEMSLOT_INVALID; | |
862 | ||
7ec4fb44 | 863 | old_memslots = install_new_memslots(kvm, slots, NULL); |
bc6678a3 | 864 | |
e40f193f AW |
865 | /* slot was deleted or moved, clear iommu mapping */ |
866 | kvm_iommu_unmap_pages(kvm, &old); | |
12d6e753 MT |
867 | /* From this point no new shadow pages pointing to a deleted, |
868 | * or moved, memslot will be created. | |
bc6678a3 MT |
869 | * |
870 | * validation of sp->gfn happens in: | |
871 | * - gfn_to_hva (kvm_read_guest, gfn_to_pfn) | |
872 | * - kvm_is_visible_gfn (mmu_check_roots) | |
873 | */ | |
2df72e9b | 874 | kvm_arch_flush_shadow_memslot(kvm, slot); |
b7f69c55 | 875 | slots = old_memslots; |
bc6678a3 | 876 | } |
34d4cb8f | 877 | |
f7784b8e MT |
878 | r = kvm_arch_prepare_memory_region(kvm, &new, old, mem, user_alloc); |
879 | if (r) | |
b7f69c55 | 880 | goto out_slots; |
f7784b8e | 881 | |
bc6678a3 | 882 | r = -ENOMEM; |
b7f69c55 AW |
883 | /* |
884 | * We can re-use the old_memslots from above, the only difference | |
885 | * from the currently installed memslots is the invalid flag. This | |
886 | * will get overwritten by update_memslots anyway. | |
887 | */ | |
888 | if (!slots) { | |
889 | slots = kmemdup(kvm->memslots, sizeof(struct kvm_memslots), | |
890 | GFP_KERNEL); | |
891 | if (!slots) | |
892 | goto out_free; | |
893 | } | |
bc6678a3 | 894 | |
261874b0 AW |
895 | /* |
896 | * IOMMU mapping: New slots need to be mapped. Old slots need to be | |
75d61fbc TY |
897 | * un-mapped and re-mapped if their base changes. Since base change |
898 | * unmapping is handled above with slot deletion, mapping alone is | |
899 | * needed here. Anything else the iommu might care about for existing | |
900 | * slots (size changes, userspace addr changes and read-only flag | |
901 | * changes) is disallowed above, so any other attribute changes getting | |
902 | * here can be skipped. | |
261874b0 | 903 | */ |
75d61fbc TY |
904 | if ((change == KVM_MR_CREATE) || (change == KVM_MR_MOVE)) { |
905 | r = kvm_iommu_map_pages(kvm, &new); | |
906 | if (r) | |
907 | goto out_slots; | |
e40f193f AW |
908 | } |
909 | ||
bc6678a3 | 910 | /* actual memory is freed via old in kvm_free_physmem_slot below */ |
f64c0398 | 911 | if (change == KVM_MR_DELETE) { |
bc6678a3 | 912 | new.dirty_bitmap = NULL; |
db3fe4eb | 913 | memset(&new.arch, 0, sizeof(new.arch)); |
bc6678a3 MT |
914 | } |
915 | ||
7ec4fb44 | 916 | old_memslots = install_new_memslots(kvm, slots, &new); |
3ad82a7e | 917 | |
f7784b8e | 918 | kvm_arch_commit_memory_region(kvm, mem, old, user_alloc); |
82ce2c96 | 919 | |
bc6678a3 MT |
920 | kvm_free_physmem_slot(&old, &new); |
921 | kfree(old_memslots); | |
922 | ||
6aa8b732 AK |
923 | return 0; |
924 | ||
e40f193f AW |
925 | out_slots: |
926 | kfree(slots); | |
f78e0e2e | 927 | out_free: |
6aa8b732 AK |
928 | kvm_free_physmem_slot(&new, &old); |
929 | out: | |
930 | return r; | |
210c7c4d | 931 | } |
f78e0e2e SY |
932 | EXPORT_SYMBOL_GPL(__kvm_set_memory_region); |
933 | ||
934 | int kvm_set_memory_region(struct kvm *kvm, | |
935 | struct kvm_userspace_memory_region *mem, | |
f82a8cfe | 936 | bool user_alloc) |
f78e0e2e SY |
937 | { |
938 | int r; | |
939 | ||
79fac95e | 940 | mutex_lock(&kvm->slots_lock); |
f78e0e2e | 941 | r = __kvm_set_memory_region(kvm, mem, user_alloc); |
79fac95e | 942 | mutex_unlock(&kvm->slots_lock); |
f78e0e2e SY |
943 | return r; |
944 | } | |
210c7c4d IE |
945 | EXPORT_SYMBOL_GPL(kvm_set_memory_region); |
946 | ||
1fe779f8 CO |
947 | int kvm_vm_ioctl_set_memory_region(struct kvm *kvm, |
948 | struct | |
949 | kvm_userspace_memory_region *mem, | |
f82a8cfe | 950 | bool user_alloc) |
210c7c4d | 951 | { |
bbacc0c1 | 952 | if (mem->slot >= KVM_USER_MEM_SLOTS) |
e0d62c7f | 953 | return -EINVAL; |
210c7c4d | 954 | return kvm_set_memory_region(kvm, mem, user_alloc); |
6aa8b732 AK |
955 | } |
956 | ||
5bb064dc ZX |
957 | int kvm_get_dirty_log(struct kvm *kvm, |
958 | struct kvm_dirty_log *log, int *is_dirty) | |
6aa8b732 AK |
959 | { |
960 | struct kvm_memory_slot *memslot; | |
961 | int r, i; | |
87bf6e7d | 962 | unsigned long n; |
6aa8b732 AK |
963 | unsigned long any = 0; |
964 | ||
6aa8b732 | 965 | r = -EINVAL; |
bbacc0c1 | 966 | if (log->slot >= KVM_USER_MEM_SLOTS) |
6aa8b732 AK |
967 | goto out; |
968 | ||
28a37544 | 969 | memslot = id_to_memslot(kvm->memslots, log->slot); |
6aa8b732 AK |
970 | r = -ENOENT; |
971 | if (!memslot->dirty_bitmap) | |
972 | goto out; | |
973 | ||
87bf6e7d | 974 | n = kvm_dirty_bitmap_bytes(memslot); |
6aa8b732 | 975 | |
cd1a4a98 | 976 | for (i = 0; !any && i < n/sizeof(long); ++i) |
6aa8b732 AK |
977 | any = memslot->dirty_bitmap[i]; |
978 | ||
979 | r = -EFAULT; | |
980 | if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n)) | |
981 | goto out; | |
982 | ||
5bb064dc ZX |
983 | if (any) |
984 | *is_dirty = 1; | |
6aa8b732 AK |
985 | |
986 | r = 0; | |
6aa8b732 | 987 | out: |
6aa8b732 AK |
988 | return r; |
989 | } | |
990 | ||
db3fe4eb TY |
991 | bool kvm_largepages_enabled(void) |
992 | { | |
993 | return largepages_enabled; | |
994 | } | |
995 | ||
54dee993 MT |
996 | void kvm_disable_largepages(void) |
997 | { | |
998 | largepages_enabled = false; | |
999 | } | |
1000 | EXPORT_SYMBOL_GPL(kvm_disable_largepages); | |
1001 | ||
49c7754c GN |
1002 | struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn) |
1003 | { | |
1004 | return __gfn_to_memslot(kvm_memslots(kvm), gfn); | |
1005 | } | |
a1f4d395 | 1006 | EXPORT_SYMBOL_GPL(gfn_to_memslot); |
6aa8b732 | 1007 | |
e0d62c7f IE |
1008 | int kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn) |
1009 | { | |
bf3e05bc | 1010 | struct kvm_memory_slot *memslot = gfn_to_memslot(kvm, gfn); |
e0d62c7f | 1011 | |
bbacc0c1 | 1012 | if (!memslot || memslot->id >= KVM_USER_MEM_SLOTS || |
bf3e05bc XG |
1013 | memslot->flags & KVM_MEMSLOT_INVALID) |
1014 | return 0; | |
e0d62c7f | 1015 | |
bf3e05bc | 1016 | return 1; |
e0d62c7f IE |
1017 | } |
1018 | EXPORT_SYMBOL_GPL(kvm_is_visible_gfn); | |
1019 | ||
8f0b1ab6 JR |
1020 | unsigned long kvm_host_page_size(struct kvm *kvm, gfn_t gfn) |
1021 | { | |
1022 | struct vm_area_struct *vma; | |
1023 | unsigned long addr, size; | |
1024 | ||
1025 | size = PAGE_SIZE; | |
1026 | ||
1027 | addr = gfn_to_hva(kvm, gfn); | |
1028 | if (kvm_is_error_hva(addr)) | |
1029 | return PAGE_SIZE; | |
1030 | ||
1031 | down_read(¤t->mm->mmap_sem); | |
1032 | vma = find_vma(current->mm, addr); | |
1033 | if (!vma) | |
1034 | goto out; | |
1035 | ||
1036 | size = vma_kernel_pagesize(vma); | |
1037 | ||
1038 | out: | |
1039 | up_read(¤t->mm->mmap_sem); | |
1040 | ||
1041 | return size; | |
1042 | } | |
1043 | ||
4d8b81ab XG |
1044 | static bool memslot_is_readonly(struct kvm_memory_slot *slot) |
1045 | { | |
1046 | return slot->flags & KVM_MEM_READONLY; | |
1047 | } | |
1048 | ||
4d8b81ab XG |
1049 | static unsigned long __gfn_to_hva_many(struct kvm_memory_slot *slot, gfn_t gfn, |
1050 | gfn_t *nr_pages, bool write) | |
539cb660 | 1051 | { |
bc6678a3 | 1052 | if (!slot || slot->flags & KVM_MEMSLOT_INVALID) |
ca3a490c | 1053 | return KVM_HVA_ERR_BAD; |
48987781 | 1054 | |
4d8b81ab XG |
1055 | if (memslot_is_readonly(slot) && write) |
1056 | return KVM_HVA_ERR_RO_BAD; | |
48987781 XG |
1057 | |
1058 | if (nr_pages) | |
1059 | *nr_pages = slot->npages - (gfn - slot->base_gfn); | |
1060 | ||
4d8b81ab | 1061 | return __gfn_to_hva_memslot(slot, gfn); |
539cb660 | 1062 | } |
48987781 | 1063 | |
4d8b81ab XG |
1064 | static unsigned long gfn_to_hva_many(struct kvm_memory_slot *slot, gfn_t gfn, |
1065 | gfn_t *nr_pages) | |
1066 | { | |
1067 | return __gfn_to_hva_many(slot, gfn, nr_pages, true); | |
539cb660 | 1068 | } |
48987781 | 1069 | |
4d8b81ab XG |
1070 | unsigned long gfn_to_hva_memslot(struct kvm_memory_slot *slot, |
1071 | gfn_t gfn) | |
1072 | { | |
1073 | return gfn_to_hva_many(slot, gfn, NULL); | |
1074 | } | |
1075 | EXPORT_SYMBOL_GPL(gfn_to_hva_memslot); | |
1076 | ||
48987781 XG |
1077 | unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn) |
1078 | { | |
49c7754c | 1079 | return gfn_to_hva_many(gfn_to_memslot(kvm, gfn), gfn, NULL); |
48987781 | 1080 | } |
0d150298 | 1081 | EXPORT_SYMBOL_GPL(gfn_to_hva); |
539cb660 | 1082 | |
86ab8cff XG |
1083 | /* |
1084 | * The hva returned by this function is only allowed to be read. | |
1085 | * It should pair with kvm_read_hva() or kvm_read_hva_atomic(). | |
1086 | */ | |
1087 | static unsigned long gfn_to_hva_read(struct kvm *kvm, gfn_t gfn) | |
1088 | { | |
4d8b81ab | 1089 | return __gfn_to_hva_many(gfn_to_memslot(kvm, gfn), gfn, NULL, false); |
86ab8cff XG |
1090 | } |
1091 | ||
1092 | static int kvm_read_hva(void *data, void __user *hva, int len) | |
8030089f | 1093 | { |
86ab8cff XG |
1094 | return __copy_from_user(data, hva, len); |
1095 | } | |
1096 | ||
1097 | static int kvm_read_hva_atomic(void *data, void __user *hva, int len) | |
1098 | { | |
1099 | return __copy_from_user_inatomic(data, hva, len); | |
8030089f GN |
1100 | } |
1101 | ||
0857b9e9 GN |
1102 | int get_user_page_nowait(struct task_struct *tsk, struct mm_struct *mm, |
1103 | unsigned long start, int write, struct page **page) | |
1104 | { | |
1105 | int flags = FOLL_TOUCH | FOLL_NOWAIT | FOLL_HWPOISON | FOLL_GET; | |
1106 | ||
1107 | if (write) | |
1108 | flags |= FOLL_WRITE; | |
1109 | ||
1110 | return __get_user_pages(tsk, mm, start, 1, flags, page, NULL, NULL); | |
1111 | } | |
1112 | ||
fafc3dba HY |
1113 | static inline int check_user_page_hwpoison(unsigned long addr) |
1114 | { | |
1115 | int rc, flags = FOLL_TOUCH | FOLL_HWPOISON | FOLL_WRITE; | |
1116 | ||
1117 | rc = __get_user_pages(current, current->mm, addr, 1, | |
1118 | flags, NULL, NULL, NULL); | |
1119 | return rc == -EHWPOISON; | |
1120 | } | |
1121 | ||
2fc84311 XG |
1122 | /* |
1123 | * The atomic path to get the writable pfn which will be stored in @pfn, | |
1124 | * true indicates success, otherwise false is returned. | |
1125 | */ | |
1126 | static bool hva_to_pfn_fast(unsigned long addr, bool atomic, bool *async, | |
1127 | bool write_fault, bool *writable, pfn_t *pfn) | |
954bbbc2 | 1128 | { |
8d4e1288 | 1129 | struct page *page[1]; |
2fc84311 | 1130 | int npages; |
954bbbc2 | 1131 | |
2fc84311 XG |
1132 | if (!(async || atomic)) |
1133 | return false; | |
af585b92 | 1134 | |
12ce13fe XG |
1135 | /* |
1136 | * Fast pin a writable pfn only if it is a write fault request | |
1137 | * or the caller allows to map a writable pfn for a read fault | |
1138 | * request. | |
1139 | */ | |
1140 | if (!(write_fault || writable)) | |
1141 | return false; | |
612819c3 | 1142 | |
2fc84311 XG |
1143 | npages = __get_user_pages_fast(addr, 1, 1, page); |
1144 | if (npages == 1) { | |
1145 | *pfn = page_to_pfn(page[0]); | |
612819c3 | 1146 | |
2fc84311 XG |
1147 | if (writable) |
1148 | *writable = true; | |
1149 | return true; | |
1150 | } | |
af585b92 | 1151 | |
2fc84311 XG |
1152 | return false; |
1153 | } | |
612819c3 | 1154 | |
2fc84311 XG |
1155 | /* |
1156 | * The slow path to get the pfn of the specified host virtual address, | |
1157 | * 1 indicates success, -errno is returned if error is detected. | |
1158 | */ | |
1159 | static int hva_to_pfn_slow(unsigned long addr, bool *async, bool write_fault, | |
1160 | bool *writable, pfn_t *pfn) | |
1161 | { | |
1162 | struct page *page[1]; | |
1163 | int npages = 0; | |
612819c3 | 1164 | |
2fc84311 XG |
1165 | might_sleep(); |
1166 | ||
1167 | if (writable) | |
1168 | *writable = write_fault; | |
1169 | ||
1170 | if (async) { | |
1171 | down_read(¤t->mm->mmap_sem); | |
1172 | npages = get_user_page_nowait(current, current->mm, | |
1173 | addr, write_fault, page); | |
1174 | up_read(¤t->mm->mmap_sem); | |
1175 | } else | |
1176 | npages = get_user_pages_fast(addr, 1, write_fault, | |
1177 | page); | |
1178 | if (npages != 1) | |
1179 | return npages; | |
1180 | ||
1181 | /* map read fault as writable if possible */ | |
12ce13fe | 1182 | if (unlikely(!write_fault) && writable) { |
2fc84311 XG |
1183 | struct page *wpage[1]; |
1184 | ||
1185 | npages = __get_user_pages_fast(addr, 1, 1, wpage); | |
1186 | if (npages == 1) { | |
1187 | *writable = true; | |
1188 | put_page(page[0]); | |
1189 | page[0] = wpage[0]; | |
612819c3 | 1190 | } |
2fc84311 XG |
1191 | |
1192 | npages = 1; | |
887c08ac | 1193 | } |
2fc84311 XG |
1194 | *pfn = page_to_pfn(page[0]); |
1195 | return npages; | |
1196 | } | |
539cb660 | 1197 | |
4d8b81ab XG |
1198 | static bool vma_is_valid(struct vm_area_struct *vma, bool write_fault) |
1199 | { | |
1200 | if (unlikely(!(vma->vm_flags & VM_READ))) | |
1201 | return false; | |
2e2e3738 | 1202 | |
4d8b81ab XG |
1203 | if (write_fault && (unlikely(!(vma->vm_flags & VM_WRITE)))) |
1204 | return false; | |
887c08ac | 1205 | |
4d8b81ab XG |
1206 | return true; |
1207 | } | |
bf998156 | 1208 | |
12ce13fe XG |
1209 | /* |
1210 | * Pin guest page in memory and return its pfn. | |
1211 | * @addr: host virtual address which maps memory to the guest | |
1212 | * @atomic: whether this function can sleep | |
1213 | * @async: whether this function need to wait IO complete if the | |
1214 | * host page is not in the memory | |
1215 | * @write_fault: whether we should get a writable host page | |
1216 | * @writable: whether it allows to map a writable host page for !@write_fault | |
1217 | * | |
1218 | * The function will map a writable host page for these two cases: | |
1219 | * 1): @write_fault = true | |
1220 | * 2): @write_fault = false && @writable, @writable will tell the caller | |
1221 | * whether the mapping is writable. | |
1222 | */ | |
2fc84311 XG |
1223 | static pfn_t hva_to_pfn(unsigned long addr, bool atomic, bool *async, |
1224 | bool write_fault, bool *writable) | |
1225 | { | |
1226 | struct vm_area_struct *vma; | |
1227 | pfn_t pfn = 0; | |
1228 | int npages; | |
2e2e3738 | 1229 | |
2fc84311 XG |
1230 | /* we can do it either atomically or asynchronously, not both */ |
1231 | BUG_ON(atomic && async); | |
8d4e1288 | 1232 | |
2fc84311 XG |
1233 | if (hva_to_pfn_fast(addr, atomic, async, write_fault, writable, &pfn)) |
1234 | return pfn; | |
1235 | ||
1236 | if (atomic) | |
1237 | return KVM_PFN_ERR_FAULT; | |
1238 | ||
1239 | npages = hva_to_pfn_slow(addr, async, write_fault, writable, &pfn); | |
1240 | if (npages == 1) | |
1241 | return pfn; | |
8d4e1288 | 1242 | |
2fc84311 XG |
1243 | down_read(¤t->mm->mmap_sem); |
1244 | if (npages == -EHWPOISON || | |
1245 | (!async && check_user_page_hwpoison(addr))) { | |
1246 | pfn = KVM_PFN_ERR_HWPOISON; | |
1247 | goto exit; | |
1248 | } | |
1249 | ||
1250 | vma = find_vma_intersection(current->mm, addr, addr + 1); | |
1251 | ||
1252 | if (vma == NULL) | |
1253 | pfn = KVM_PFN_ERR_FAULT; | |
1254 | else if ((vma->vm_flags & VM_PFNMAP)) { | |
1255 | pfn = ((addr - vma->vm_start) >> PAGE_SHIFT) + | |
1256 | vma->vm_pgoff; | |
1257 | BUG_ON(!kvm_is_mmio_pfn(pfn)); | |
1258 | } else { | |
4d8b81ab | 1259 | if (async && vma_is_valid(vma, write_fault)) |
2fc84311 XG |
1260 | *async = true; |
1261 | pfn = KVM_PFN_ERR_FAULT; | |
1262 | } | |
1263 | exit: | |
1264 | up_read(¤t->mm->mmap_sem); | |
2e2e3738 | 1265 | return pfn; |
35149e21 AL |
1266 | } |
1267 | ||
4d8b81ab XG |
1268 | static pfn_t |
1269 | __gfn_to_pfn_memslot(struct kvm_memory_slot *slot, gfn_t gfn, bool atomic, | |
1270 | bool *async, bool write_fault, bool *writable) | |
887c08ac | 1271 | { |
4d8b81ab XG |
1272 | unsigned long addr = __gfn_to_hva_many(slot, gfn, NULL, write_fault); |
1273 | ||
1274 | if (addr == KVM_HVA_ERR_RO_BAD) | |
1275 | return KVM_PFN_ERR_RO_FAULT; | |
1276 | ||
1277 | if (kvm_is_error_hva(addr)) | |
81c52c56 | 1278 | return KVM_PFN_NOSLOT; |
4d8b81ab XG |
1279 | |
1280 | /* Do not map writable pfn in the readonly memslot. */ | |
1281 | if (writable && memslot_is_readonly(slot)) { | |
1282 | *writable = false; | |
1283 | writable = NULL; | |
1284 | } | |
1285 | ||
1286 | return hva_to_pfn(addr, atomic, async, write_fault, | |
1287 | writable); | |
887c08ac | 1288 | } |
887c08ac | 1289 | |
612819c3 MT |
1290 | static pfn_t __gfn_to_pfn(struct kvm *kvm, gfn_t gfn, bool atomic, bool *async, |
1291 | bool write_fault, bool *writable) | |
506f0d6f | 1292 | { |
4d8b81ab | 1293 | struct kvm_memory_slot *slot; |
506f0d6f | 1294 | |
af585b92 GN |
1295 | if (async) |
1296 | *async = false; | |
1297 | ||
4d8b81ab | 1298 | slot = gfn_to_memslot(kvm, gfn); |
506f0d6f | 1299 | |
4d8b81ab XG |
1300 | return __gfn_to_pfn_memslot(slot, gfn, atomic, async, write_fault, |
1301 | writable); | |
365fb3fd XG |
1302 | } |
1303 | ||
1304 | pfn_t gfn_to_pfn_atomic(struct kvm *kvm, gfn_t gfn) | |
1305 | { | |
612819c3 | 1306 | return __gfn_to_pfn(kvm, gfn, true, NULL, true, NULL); |
365fb3fd XG |
1307 | } |
1308 | EXPORT_SYMBOL_GPL(gfn_to_pfn_atomic); | |
1309 | ||
612819c3 MT |
1310 | pfn_t gfn_to_pfn_async(struct kvm *kvm, gfn_t gfn, bool *async, |
1311 | bool write_fault, bool *writable) | |
af585b92 | 1312 | { |
612819c3 | 1313 | return __gfn_to_pfn(kvm, gfn, false, async, write_fault, writable); |
af585b92 GN |
1314 | } |
1315 | EXPORT_SYMBOL_GPL(gfn_to_pfn_async); | |
1316 | ||
365fb3fd XG |
1317 | pfn_t gfn_to_pfn(struct kvm *kvm, gfn_t gfn) |
1318 | { | |
612819c3 | 1319 | return __gfn_to_pfn(kvm, gfn, false, NULL, true, NULL); |
506f0d6f | 1320 | } |
35149e21 AL |
1321 | EXPORT_SYMBOL_GPL(gfn_to_pfn); |
1322 | ||
612819c3 MT |
1323 | pfn_t gfn_to_pfn_prot(struct kvm *kvm, gfn_t gfn, bool write_fault, |
1324 | bool *writable) | |
1325 | { | |
1326 | return __gfn_to_pfn(kvm, gfn, false, NULL, write_fault, writable); | |
1327 | } | |
1328 | EXPORT_SYMBOL_GPL(gfn_to_pfn_prot); | |
1329 | ||
d5661048 | 1330 | pfn_t gfn_to_pfn_memslot(struct kvm_memory_slot *slot, gfn_t gfn) |
506f0d6f | 1331 | { |
4d8b81ab | 1332 | return __gfn_to_pfn_memslot(slot, gfn, false, NULL, true, NULL); |
506f0d6f MT |
1333 | } |
1334 | ||
037d92dc | 1335 | pfn_t gfn_to_pfn_memslot_atomic(struct kvm_memory_slot *slot, gfn_t gfn) |
506f0d6f | 1336 | { |
4d8b81ab | 1337 | return __gfn_to_pfn_memslot(slot, gfn, true, NULL, true, NULL); |
506f0d6f | 1338 | } |
037d92dc | 1339 | EXPORT_SYMBOL_GPL(gfn_to_pfn_memslot_atomic); |
506f0d6f | 1340 | |
48987781 XG |
1341 | int gfn_to_page_many_atomic(struct kvm *kvm, gfn_t gfn, struct page **pages, |
1342 | int nr_pages) | |
1343 | { | |
1344 | unsigned long addr; | |
1345 | gfn_t entry; | |
1346 | ||
49c7754c | 1347 | addr = gfn_to_hva_many(gfn_to_memslot(kvm, gfn), gfn, &entry); |
48987781 XG |
1348 | if (kvm_is_error_hva(addr)) |
1349 | return -1; | |
1350 | ||
1351 | if (entry < nr_pages) | |
1352 | return 0; | |
1353 | ||
1354 | return __get_user_pages_fast(addr, nr_pages, 1, pages); | |
1355 | } | |
1356 | EXPORT_SYMBOL_GPL(gfn_to_page_many_atomic); | |
1357 | ||
a2766325 XG |
1358 | static struct page *kvm_pfn_to_page(pfn_t pfn) |
1359 | { | |
81c52c56 | 1360 | if (is_error_noslot_pfn(pfn)) |
cb9aaa30 | 1361 | return KVM_ERR_PTR_BAD_PAGE; |
a2766325 | 1362 | |
cb9aaa30 XG |
1363 | if (kvm_is_mmio_pfn(pfn)) { |
1364 | WARN_ON(1); | |
6cede2e6 | 1365 | return KVM_ERR_PTR_BAD_PAGE; |
cb9aaa30 | 1366 | } |
a2766325 XG |
1367 | |
1368 | return pfn_to_page(pfn); | |
1369 | } | |
1370 | ||
35149e21 AL |
1371 | struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn) |
1372 | { | |
2e2e3738 AL |
1373 | pfn_t pfn; |
1374 | ||
1375 | pfn = gfn_to_pfn(kvm, gfn); | |
2e2e3738 | 1376 | |
a2766325 | 1377 | return kvm_pfn_to_page(pfn); |
954bbbc2 | 1378 | } |
aab61cc0 | 1379 | |
954bbbc2 AK |
1380 | EXPORT_SYMBOL_GPL(gfn_to_page); |
1381 | ||
b4231d61 IE |
1382 | void kvm_release_page_clean(struct page *page) |
1383 | { | |
32cad84f XG |
1384 | WARN_ON(is_error_page(page)); |
1385 | ||
35149e21 | 1386 | kvm_release_pfn_clean(page_to_pfn(page)); |
b4231d61 IE |
1387 | } |
1388 | EXPORT_SYMBOL_GPL(kvm_release_page_clean); | |
1389 | ||
35149e21 AL |
1390 | void kvm_release_pfn_clean(pfn_t pfn) |
1391 | { | |
81c52c56 | 1392 | if (!is_error_noslot_pfn(pfn) && !kvm_is_mmio_pfn(pfn)) |
2e2e3738 | 1393 | put_page(pfn_to_page(pfn)); |
35149e21 AL |
1394 | } |
1395 | EXPORT_SYMBOL_GPL(kvm_release_pfn_clean); | |
1396 | ||
b4231d61 | 1397 | void kvm_release_page_dirty(struct page *page) |
8a7ae055 | 1398 | { |
a2766325 XG |
1399 | WARN_ON(is_error_page(page)); |
1400 | ||
35149e21 AL |
1401 | kvm_release_pfn_dirty(page_to_pfn(page)); |
1402 | } | |
1403 | EXPORT_SYMBOL_GPL(kvm_release_page_dirty); | |
1404 | ||
1405 | void kvm_release_pfn_dirty(pfn_t pfn) | |
1406 | { | |
1407 | kvm_set_pfn_dirty(pfn); | |
1408 | kvm_release_pfn_clean(pfn); | |
1409 | } | |
1410 | EXPORT_SYMBOL_GPL(kvm_release_pfn_dirty); | |
1411 | ||
1412 | void kvm_set_page_dirty(struct page *page) | |
1413 | { | |
1414 | kvm_set_pfn_dirty(page_to_pfn(page)); | |
1415 | } | |
1416 | EXPORT_SYMBOL_GPL(kvm_set_page_dirty); | |
1417 | ||
1418 | void kvm_set_pfn_dirty(pfn_t pfn) | |
1419 | { | |
c77fb9dc | 1420 | if (!kvm_is_mmio_pfn(pfn)) { |
2e2e3738 AL |
1421 | struct page *page = pfn_to_page(pfn); |
1422 | if (!PageReserved(page)) | |
1423 | SetPageDirty(page); | |
1424 | } | |
8a7ae055 | 1425 | } |
35149e21 AL |
1426 | EXPORT_SYMBOL_GPL(kvm_set_pfn_dirty); |
1427 | ||
1428 | void kvm_set_pfn_accessed(pfn_t pfn) | |
1429 | { | |
c77fb9dc | 1430 | if (!kvm_is_mmio_pfn(pfn)) |
2e2e3738 | 1431 | mark_page_accessed(pfn_to_page(pfn)); |
35149e21 AL |
1432 | } |
1433 | EXPORT_SYMBOL_GPL(kvm_set_pfn_accessed); | |
1434 | ||
1435 | void kvm_get_pfn(pfn_t pfn) | |
1436 | { | |
c77fb9dc | 1437 | if (!kvm_is_mmio_pfn(pfn)) |
2e2e3738 | 1438 | get_page(pfn_to_page(pfn)); |
35149e21 AL |
1439 | } |
1440 | EXPORT_SYMBOL_GPL(kvm_get_pfn); | |
8a7ae055 | 1441 | |
195aefde IE |
1442 | static int next_segment(unsigned long len, int offset) |
1443 | { | |
1444 | if (len > PAGE_SIZE - offset) | |
1445 | return PAGE_SIZE - offset; | |
1446 | else | |
1447 | return len; | |
1448 | } | |
1449 | ||
1450 | int kvm_read_guest_page(struct kvm *kvm, gfn_t gfn, void *data, int offset, | |
1451 | int len) | |
1452 | { | |
e0506bcb IE |
1453 | int r; |
1454 | unsigned long addr; | |
195aefde | 1455 | |
86ab8cff | 1456 | addr = gfn_to_hva_read(kvm, gfn); |
e0506bcb IE |
1457 | if (kvm_is_error_hva(addr)) |
1458 | return -EFAULT; | |
86ab8cff | 1459 | r = kvm_read_hva(data, (void __user *)addr + offset, len); |
e0506bcb | 1460 | if (r) |
195aefde | 1461 | return -EFAULT; |
195aefde IE |
1462 | return 0; |
1463 | } | |
1464 | EXPORT_SYMBOL_GPL(kvm_read_guest_page); | |
1465 | ||
1466 | int kvm_read_guest(struct kvm *kvm, gpa_t gpa, void *data, unsigned long len) | |
1467 | { | |
1468 | gfn_t gfn = gpa >> PAGE_SHIFT; | |
1469 | int seg; | |
1470 | int offset = offset_in_page(gpa); | |
1471 | int ret; | |
1472 | ||
1473 | while ((seg = next_segment(len, offset)) != 0) { | |
1474 | ret = kvm_read_guest_page(kvm, gfn, data, offset, seg); | |
1475 | if (ret < 0) | |
1476 | return ret; | |
1477 | offset = 0; | |
1478 | len -= seg; | |
1479 | data += seg; | |
1480 | ++gfn; | |
1481 | } | |
1482 | return 0; | |
1483 | } | |
1484 | EXPORT_SYMBOL_GPL(kvm_read_guest); | |
1485 | ||
7ec54588 MT |
1486 | int kvm_read_guest_atomic(struct kvm *kvm, gpa_t gpa, void *data, |
1487 | unsigned long len) | |
1488 | { | |
1489 | int r; | |
1490 | unsigned long addr; | |
1491 | gfn_t gfn = gpa >> PAGE_SHIFT; | |
1492 | int offset = offset_in_page(gpa); | |
1493 | ||
86ab8cff | 1494 | addr = gfn_to_hva_read(kvm, gfn); |
7ec54588 MT |
1495 | if (kvm_is_error_hva(addr)) |
1496 | return -EFAULT; | |
0aac03f0 | 1497 | pagefault_disable(); |
86ab8cff | 1498 | r = kvm_read_hva_atomic(data, (void __user *)addr + offset, len); |
0aac03f0 | 1499 | pagefault_enable(); |
7ec54588 MT |
1500 | if (r) |
1501 | return -EFAULT; | |
1502 | return 0; | |
1503 | } | |
1504 | EXPORT_SYMBOL(kvm_read_guest_atomic); | |
1505 | ||
195aefde IE |
1506 | int kvm_write_guest_page(struct kvm *kvm, gfn_t gfn, const void *data, |
1507 | int offset, int len) | |
1508 | { | |
e0506bcb IE |
1509 | int r; |
1510 | unsigned long addr; | |
195aefde | 1511 | |
e0506bcb IE |
1512 | addr = gfn_to_hva(kvm, gfn); |
1513 | if (kvm_is_error_hva(addr)) | |
1514 | return -EFAULT; | |
8b0cedff | 1515 | r = __copy_to_user((void __user *)addr + offset, data, len); |
e0506bcb | 1516 | if (r) |
195aefde | 1517 | return -EFAULT; |
195aefde IE |
1518 | mark_page_dirty(kvm, gfn); |
1519 | return 0; | |
1520 | } | |
1521 | EXPORT_SYMBOL_GPL(kvm_write_guest_page); | |
1522 | ||
1523 | int kvm_write_guest(struct kvm *kvm, gpa_t gpa, const void *data, | |
1524 | unsigned long len) | |
1525 | { | |
1526 | gfn_t gfn = gpa >> PAGE_SHIFT; | |
1527 | int seg; | |
1528 | int offset = offset_in_page(gpa); | |
1529 | int ret; | |
1530 | ||
1531 | while ((seg = next_segment(len, offset)) != 0) { | |
1532 | ret = kvm_write_guest_page(kvm, gfn, data, offset, seg); | |
1533 | if (ret < 0) | |
1534 | return ret; | |
1535 | offset = 0; | |
1536 | len -= seg; | |
1537 | data += seg; | |
1538 | ++gfn; | |
1539 | } | |
1540 | return 0; | |
1541 | } | |
1542 | ||
49c7754c | 1543 | int kvm_gfn_to_hva_cache_init(struct kvm *kvm, struct gfn_to_hva_cache *ghc, |
8f964525 | 1544 | gpa_t gpa, unsigned long len) |
49c7754c GN |
1545 | { |
1546 | struct kvm_memslots *slots = kvm_memslots(kvm); | |
1547 | int offset = offset_in_page(gpa); | |
8f964525 AH |
1548 | gfn_t start_gfn = gpa >> PAGE_SHIFT; |
1549 | gfn_t end_gfn = (gpa + len - 1) >> PAGE_SHIFT; | |
1550 | gfn_t nr_pages_needed = end_gfn - start_gfn + 1; | |
1551 | gfn_t nr_pages_avail; | |
49c7754c GN |
1552 | |
1553 | ghc->gpa = gpa; | |
1554 | ghc->generation = slots->generation; | |
8f964525 AH |
1555 | ghc->len = len; |
1556 | ghc->memslot = gfn_to_memslot(kvm, start_gfn); | |
1557 | ghc->hva = gfn_to_hva_many(ghc->memslot, start_gfn, &nr_pages_avail); | |
1558 | if (!kvm_is_error_hva(ghc->hva) && nr_pages_avail >= nr_pages_needed) { | |
49c7754c | 1559 | ghc->hva += offset; |
8f964525 AH |
1560 | } else { |
1561 | /* | |
1562 | * If the requested region crosses two memslots, we still | |
1563 | * verify that the entire region is valid here. | |
1564 | */ | |
1565 | while (start_gfn <= end_gfn) { | |
1566 | ghc->memslot = gfn_to_memslot(kvm, start_gfn); | |
1567 | ghc->hva = gfn_to_hva_many(ghc->memslot, start_gfn, | |
1568 | &nr_pages_avail); | |
1569 | if (kvm_is_error_hva(ghc->hva)) | |
1570 | return -EFAULT; | |
1571 | start_gfn += nr_pages_avail; | |
1572 | } | |
1573 | /* Use the slow path for cross page reads and writes. */ | |
1574 | ghc->memslot = NULL; | |
1575 | } | |
49c7754c GN |
1576 | return 0; |
1577 | } | |
1578 | EXPORT_SYMBOL_GPL(kvm_gfn_to_hva_cache_init); | |
1579 | ||
1580 | int kvm_write_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc, | |
1581 | void *data, unsigned long len) | |
1582 | { | |
1583 | struct kvm_memslots *slots = kvm_memslots(kvm); | |
1584 | int r; | |
1585 | ||
8f964525 AH |
1586 | BUG_ON(len > ghc->len); |
1587 | ||
49c7754c | 1588 | if (slots->generation != ghc->generation) |
8f964525 AH |
1589 | kvm_gfn_to_hva_cache_init(kvm, ghc, ghc->gpa, ghc->len); |
1590 | ||
1591 | if (unlikely(!ghc->memslot)) | |
1592 | return kvm_write_guest(kvm, ghc->gpa, data, len); | |
49c7754c GN |
1593 | |
1594 | if (kvm_is_error_hva(ghc->hva)) | |
1595 | return -EFAULT; | |
1596 | ||
8b0cedff | 1597 | r = __copy_to_user((void __user *)ghc->hva, data, len); |
49c7754c GN |
1598 | if (r) |
1599 | return -EFAULT; | |
1600 | mark_page_dirty_in_slot(kvm, ghc->memslot, ghc->gpa >> PAGE_SHIFT); | |
1601 | ||
1602 | return 0; | |
1603 | } | |
1604 | EXPORT_SYMBOL_GPL(kvm_write_guest_cached); | |
1605 | ||
e03b644f GN |
1606 | int kvm_read_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc, |
1607 | void *data, unsigned long len) | |
1608 | { | |
1609 | struct kvm_memslots *slots = kvm_memslots(kvm); | |
1610 | int r; | |
1611 | ||
8f964525 AH |
1612 | BUG_ON(len > ghc->len); |
1613 | ||
e03b644f | 1614 | if (slots->generation != ghc->generation) |
8f964525 AH |
1615 | kvm_gfn_to_hva_cache_init(kvm, ghc, ghc->gpa, ghc->len); |
1616 | ||
1617 | if (unlikely(!ghc->memslot)) | |
1618 | return kvm_read_guest(kvm, ghc->gpa, data, len); | |
e03b644f GN |
1619 | |
1620 | if (kvm_is_error_hva(ghc->hva)) | |
1621 | return -EFAULT; | |
1622 | ||
1623 | r = __copy_from_user(data, (void __user *)ghc->hva, len); | |
1624 | if (r) | |
1625 | return -EFAULT; | |
1626 | ||
1627 | return 0; | |
1628 | } | |
1629 | EXPORT_SYMBOL_GPL(kvm_read_guest_cached); | |
1630 | ||
195aefde IE |
1631 | int kvm_clear_guest_page(struct kvm *kvm, gfn_t gfn, int offset, int len) |
1632 | { | |
3bcc8a8c HC |
1633 | return kvm_write_guest_page(kvm, gfn, (const void *) empty_zero_page, |
1634 | offset, len); | |
195aefde IE |
1635 | } |
1636 | EXPORT_SYMBOL_GPL(kvm_clear_guest_page); | |
1637 | ||
1638 | int kvm_clear_guest(struct kvm *kvm, gpa_t gpa, unsigned long len) | |
1639 | { | |
1640 | gfn_t gfn = gpa >> PAGE_SHIFT; | |
1641 | int seg; | |
1642 | int offset = offset_in_page(gpa); | |
1643 | int ret; | |
1644 | ||
1645 | while ((seg = next_segment(len, offset)) != 0) { | |
1646 | ret = kvm_clear_guest_page(kvm, gfn, offset, seg); | |
1647 | if (ret < 0) | |
1648 | return ret; | |
1649 | offset = 0; | |
1650 | len -= seg; | |
1651 | ++gfn; | |
1652 | } | |
1653 | return 0; | |
1654 | } | |
1655 | EXPORT_SYMBOL_GPL(kvm_clear_guest); | |
1656 | ||
49c7754c GN |
1657 | void mark_page_dirty_in_slot(struct kvm *kvm, struct kvm_memory_slot *memslot, |
1658 | gfn_t gfn) | |
6aa8b732 | 1659 | { |
7e9d619d RR |
1660 | if (memslot && memslot->dirty_bitmap) { |
1661 | unsigned long rel_gfn = gfn - memslot->base_gfn; | |
6aa8b732 | 1662 | |
b74ca3b3 | 1663 | set_bit_le(rel_gfn, memslot->dirty_bitmap); |
6aa8b732 AK |
1664 | } |
1665 | } | |
1666 | ||
49c7754c GN |
1667 | void mark_page_dirty(struct kvm *kvm, gfn_t gfn) |
1668 | { | |
1669 | struct kvm_memory_slot *memslot; | |
1670 | ||
1671 | memslot = gfn_to_memslot(kvm, gfn); | |
1672 | mark_page_dirty_in_slot(kvm, memslot, gfn); | |
1673 | } | |
1674 | ||
b6958ce4 ED |
1675 | /* |
1676 | * The vCPU has executed a HLT instruction with in-kernel mode enabled. | |
1677 | */ | |
8776e519 | 1678 | void kvm_vcpu_block(struct kvm_vcpu *vcpu) |
d3bef15f | 1679 | { |
e5c239cf MT |
1680 | DEFINE_WAIT(wait); |
1681 | ||
1682 | for (;;) { | |
1683 | prepare_to_wait(&vcpu->wq, &wait, TASK_INTERRUPTIBLE); | |
1684 | ||
a1b37100 | 1685 | if (kvm_arch_vcpu_runnable(vcpu)) { |
a8eeb04a | 1686 | kvm_make_request(KVM_REQ_UNHALT, vcpu); |
e5c239cf | 1687 | break; |
d7690175 | 1688 | } |
09cec754 GN |
1689 | if (kvm_cpu_has_pending_timer(vcpu)) |
1690 | break; | |
e5c239cf MT |
1691 | if (signal_pending(current)) |
1692 | break; | |
1693 | ||
b6958ce4 | 1694 | schedule(); |
b6958ce4 | 1695 | } |
d3bef15f | 1696 | |
e5c239cf | 1697 | finish_wait(&vcpu->wq, &wait); |
b6958ce4 ED |
1698 | } |
1699 | ||
8c84780d | 1700 | #ifndef CONFIG_S390 |
b6d33834 CD |
1701 | /* |
1702 | * Kick a sleeping VCPU, or a guest VCPU in guest mode, into host kernel mode. | |
1703 | */ | |
1704 | void kvm_vcpu_kick(struct kvm_vcpu *vcpu) | |
1705 | { | |
1706 | int me; | |
1707 | int cpu = vcpu->cpu; | |
1708 | wait_queue_head_t *wqp; | |
1709 | ||
1710 | wqp = kvm_arch_vcpu_wq(vcpu); | |
1711 | if (waitqueue_active(wqp)) { | |
1712 | wake_up_interruptible(wqp); | |
1713 | ++vcpu->stat.halt_wakeup; | |
1714 | } | |
1715 | ||
1716 | me = get_cpu(); | |
1717 | if (cpu != me && (unsigned)cpu < nr_cpu_ids && cpu_online(cpu)) | |
1718 | if (kvm_arch_vcpu_should_kick(vcpu)) | |
1719 | smp_send_reschedule(cpu); | |
1720 | put_cpu(); | |
1721 | } | |
8c84780d | 1722 | #endif /* !CONFIG_S390 */ |
b6d33834 | 1723 | |
6aa8b732 AK |
1724 | void kvm_resched(struct kvm_vcpu *vcpu) |
1725 | { | |
3fca0365 YD |
1726 | if (!need_resched()) |
1727 | return; | |
6aa8b732 | 1728 | cond_resched(); |
6aa8b732 AK |
1729 | } |
1730 | EXPORT_SYMBOL_GPL(kvm_resched); | |
1731 | ||
41628d33 KW |
1732 | bool kvm_vcpu_yield_to(struct kvm_vcpu *target) |
1733 | { | |
1734 | struct pid *pid; | |
1735 | struct task_struct *task = NULL; | |
c45c528e | 1736 | bool ret = false; |
41628d33 KW |
1737 | |
1738 | rcu_read_lock(); | |
1739 | pid = rcu_dereference(target->pid); | |
1740 | if (pid) | |
1741 | task = get_pid_task(target->pid, PIDTYPE_PID); | |
1742 | rcu_read_unlock(); | |
1743 | if (!task) | |
c45c528e | 1744 | return ret; |
41628d33 KW |
1745 | if (task->flags & PF_VCPU) { |
1746 | put_task_struct(task); | |
c45c528e | 1747 | return ret; |
41628d33 | 1748 | } |
c45c528e | 1749 | ret = yield_to(task, 1); |
41628d33 | 1750 | put_task_struct(task); |
c45c528e R |
1751 | |
1752 | return ret; | |
41628d33 KW |
1753 | } |
1754 | EXPORT_SYMBOL_GPL(kvm_vcpu_yield_to); | |
1755 | ||
06e48c51 R |
1756 | #ifdef CONFIG_HAVE_KVM_CPU_RELAX_INTERCEPT |
1757 | /* | |
1758 | * Helper that checks whether a VCPU is eligible for directed yield. | |
1759 | * Most eligible candidate to yield is decided by following heuristics: | |
1760 | * | |
1761 | * (a) VCPU which has not done pl-exit or cpu relax intercepted recently | |
1762 | * (preempted lock holder), indicated by @in_spin_loop. | |
1763 | * Set at the beiginning and cleared at the end of interception/PLE handler. | |
1764 | * | |
1765 | * (b) VCPU which has done pl-exit/ cpu relax intercepted but did not get | |
1766 | * chance last time (mostly it has become eligible now since we have probably | |
1767 | * yielded to lockholder in last iteration. This is done by toggling | |
1768 | * @dy_eligible each time a VCPU checked for eligibility.) | |
1769 | * | |
1770 | * Yielding to a recently pl-exited/cpu relax intercepted VCPU before yielding | |
1771 | * to preempted lock-holder could result in wrong VCPU selection and CPU | |
1772 | * burning. Giving priority for a potential lock-holder increases lock | |
1773 | * progress. | |
1774 | * | |
1775 | * Since algorithm is based on heuristics, accessing another VCPU data without | |
1776 | * locking does not harm. It may result in trying to yield to same VCPU, fail | |
1777 | * and continue with next VCPU and so on. | |
1778 | */ | |
1779 | bool kvm_vcpu_eligible_for_directed_yield(struct kvm_vcpu *vcpu) | |
1780 | { | |
1781 | bool eligible; | |
1782 | ||
1783 | eligible = !vcpu->spin_loop.in_spin_loop || | |
1784 | (vcpu->spin_loop.in_spin_loop && | |
1785 | vcpu->spin_loop.dy_eligible); | |
1786 | ||
1787 | if (vcpu->spin_loop.in_spin_loop) | |
1788 | kvm_vcpu_set_dy_eligible(vcpu, !vcpu->spin_loop.dy_eligible); | |
1789 | ||
1790 | return eligible; | |
1791 | } | |
1792 | #endif | |
c45c528e | 1793 | |
217ece61 | 1794 | void kvm_vcpu_on_spin(struct kvm_vcpu *me) |
d255f4f2 | 1795 | { |
217ece61 RR |
1796 | struct kvm *kvm = me->kvm; |
1797 | struct kvm_vcpu *vcpu; | |
1798 | int last_boosted_vcpu = me->kvm->last_boosted_vcpu; | |
1799 | int yielded = 0; | |
c45c528e | 1800 | int try = 3; |
217ece61 RR |
1801 | int pass; |
1802 | int i; | |
d255f4f2 | 1803 | |
4c088493 | 1804 | kvm_vcpu_set_in_spin_loop(me, true); |
217ece61 RR |
1805 | /* |
1806 | * We boost the priority of a VCPU that is runnable but not | |
1807 | * currently running, because it got preempted by something | |
1808 | * else and called schedule in __vcpu_run. Hopefully that | |
1809 | * VCPU is holding the lock that we need and will release it. | |
1810 | * We approximate round-robin by starting at the last boosted VCPU. | |
1811 | */ | |
c45c528e | 1812 | for (pass = 0; pass < 2 && !yielded && try; pass++) { |
217ece61 | 1813 | kvm_for_each_vcpu(i, vcpu, kvm) { |
5cfc2aab | 1814 | if (!pass && i <= last_boosted_vcpu) { |
217ece61 RR |
1815 | i = last_boosted_vcpu; |
1816 | continue; | |
1817 | } else if (pass && i > last_boosted_vcpu) | |
1818 | break; | |
1819 | if (vcpu == me) | |
1820 | continue; | |
1821 | if (waitqueue_active(&vcpu->wq)) | |
1822 | continue; | |
06e48c51 R |
1823 | if (!kvm_vcpu_eligible_for_directed_yield(vcpu)) |
1824 | continue; | |
c45c528e R |
1825 | |
1826 | yielded = kvm_vcpu_yield_to(vcpu); | |
1827 | if (yielded > 0) { | |
217ece61 | 1828 | kvm->last_boosted_vcpu = i; |
217ece61 | 1829 | break; |
c45c528e R |
1830 | } else if (yielded < 0) { |
1831 | try--; | |
1832 | if (!try) | |
1833 | break; | |
217ece61 | 1834 | } |
217ece61 RR |
1835 | } |
1836 | } | |
4c088493 | 1837 | kvm_vcpu_set_in_spin_loop(me, false); |
06e48c51 R |
1838 | |
1839 | /* Ensure vcpu is not eligible during next spinloop */ | |
1840 | kvm_vcpu_set_dy_eligible(me, false); | |
d255f4f2 ZE |
1841 | } |
1842 | EXPORT_SYMBOL_GPL(kvm_vcpu_on_spin); | |
1843 | ||
e4a533a4 | 1844 | static int kvm_vcpu_fault(struct vm_area_struct *vma, struct vm_fault *vmf) |
9a2bb7f4 AK |
1845 | { |
1846 | struct kvm_vcpu *vcpu = vma->vm_file->private_data; | |
9a2bb7f4 AK |
1847 | struct page *page; |
1848 | ||
e4a533a4 | 1849 | if (vmf->pgoff == 0) |
039576c0 | 1850 | page = virt_to_page(vcpu->run); |
09566765 | 1851 | #ifdef CONFIG_X86 |
e4a533a4 | 1852 | else if (vmf->pgoff == KVM_PIO_PAGE_OFFSET) |
ad312c7c | 1853 | page = virt_to_page(vcpu->arch.pio_data); |
5f94c174 LV |
1854 | #endif |
1855 | #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET | |
1856 | else if (vmf->pgoff == KVM_COALESCED_MMIO_PAGE_OFFSET) | |
1857 | page = virt_to_page(vcpu->kvm->coalesced_mmio_ring); | |
09566765 | 1858 | #endif |
039576c0 | 1859 | else |
5b1c1493 | 1860 | return kvm_arch_vcpu_fault(vcpu, vmf); |
9a2bb7f4 | 1861 | get_page(page); |
e4a533a4 | 1862 | vmf->page = page; |
1863 | return 0; | |
9a2bb7f4 AK |
1864 | } |
1865 | ||
f0f37e2f | 1866 | static const struct vm_operations_struct kvm_vcpu_vm_ops = { |
e4a533a4 | 1867 | .fault = kvm_vcpu_fault, |
9a2bb7f4 AK |
1868 | }; |
1869 | ||
1870 | static int kvm_vcpu_mmap(struct file *file, struct vm_area_struct *vma) | |
1871 | { | |
1872 | vma->vm_ops = &kvm_vcpu_vm_ops; | |
1873 | return 0; | |
1874 | } | |
1875 | ||
bccf2150 AK |
1876 | static int kvm_vcpu_release(struct inode *inode, struct file *filp) |
1877 | { | |
1878 | struct kvm_vcpu *vcpu = filp->private_data; | |
1879 | ||
66c0b394 | 1880 | kvm_put_kvm(vcpu->kvm); |
bccf2150 AK |
1881 | return 0; |
1882 | } | |
1883 | ||
3d3aab1b | 1884 | static struct file_operations kvm_vcpu_fops = { |
bccf2150 AK |
1885 | .release = kvm_vcpu_release, |
1886 | .unlocked_ioctl = kvm_vcpu_ioctl, | |
1dda606c AG |
1887 | #ifdef CONFIG_COMPAT |
1888 | .compat_ioctl = kvm_vcpu_compat_ioctl, | |
1889 | #endif | |
9a2bb7f4 | 1890 | .mmap = kvm_vcpu_mmap, |
6038f373 | 1891 | .llseek = noop_llseek, |
bccf2150 AK |
1892 | }; |
1893 | ||
1894 | /* | |
1895 | * Allocates an inode for the vcpu. | |
1896 | */ | |
1897 | static int create_vcpu_fd(struct kvm_vcpu *vcpu) | |
1898 | { | |
628ff7c1 | 1899 | return anon_inode_getfd("kvm-vcpu", &kvm_vcpu_fops, vcpu, O_RDWR); |
bccf2150 AK |
1900 | } |
1901 | ||
c5ea7660 AK |
1902 | /* |
1903 | * Creates some virtual cpus. Good luck creating more than one. | |
1904 | */ | |
73880c80 | 1905 | static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, u32 id) |
c5ea7660 AK |
1906 | { |
1907 | int r; | |
988a2cae | 1908 | struct kvm_vcpu *vcpu, *v; |
c5ea7660 | 1909 | |
73880c80 | 1910 | vcpu = kvm_arch_vcpu_create(kvm, id); |
fb3f0f51 RR |
1911 | if (IS_ERR(vcpu)) |
1912 | return PTR_ERR(vcpu); | |
c5ea7660 | 1913 | |
15ad7146 AK |
1914 | preempt_notifier_init(&vcpu->preempt_notifier, &kvm_preempt_ops); |
1915 | ||
26e5215f AK |
1916 | r = kvm_arch_vcpu_setup(vcpu); |
1917 | if (r) | |
d780592b | 1918 | goto vcpu_destroy; |
26e5215f | 1919 | |
11ec2804 | 1920 | mutex_lock(&kvm->lock); |
3e515705 AK |
1921 | if (!kvm_vcpu_compatible(vcpu)) { |
1922 | r = -EINVAL; | |
1923 | goto unlock_vcpu_destroy; | |
1924 | } | |
73880c80 GN |
1925 | if (atomic_read(&kvm->online_vcpus) == KVM_MAX_VCPUS) { |
1926 | r = -EINVAL; | |
d780592b | 1927 | goto unlock_vcpu_destroy; |
fb3f0f51 | 1928 | } |
73880c80 | 1929 | |
988a2cae GN |
1930 | kvm_for_each_vcpu(r, v, kvm) |
1931 | if (v->vcpu_id == id) { | |
73880c80 | 1932 | r = -EEXIST; |
d780592b | 1933 | goto unlock_vcpu_destroy; |
73880c80 GN |
1934 | } |
1935 | ||
1936 | BUG_ON(kvm->vcpus[atomic_read(&kvm->online_vcpus)]); | |
c5ea7660 | 1937 | |
fb3f0f51 | 1938 | /* Now it's all set up, let userspace reach it */ |
66c0b394 | 1939 | kvm_get_kvm(kvm); |
bccf2150 | 1940 | r = create_vcpu_fd(vcpu); |
73880c80 GN |
1941 | if (r < 0) { |
1942 | kvm_put_kvm(kvm); | |
d780592b | 1943 | goto unlock_vcpu_destroy; |
73880c80 GN |
1944 | } |
1945 | ||
1946 | kvm->vcpus[atomic_read(&kvm->online_vcpus)] = vcpu; | |
1947 | smp_wmb(); | |
1948 | atomic_inc(&kvm->online_vcpus); | |
1949 | ||
73880c80 | 1950 | mutex_unlock(&kvm->lock); |
42897d86 | 1951 | kvm_arch_vcpu_postcreate(vcpu); |
fb3f0f51 | 1952 | return r; |
39c3b86e | 1953 | |
d780592b | 1954 | unlock_vcpu_destroy: |
7d8fece6 | 1955 | mutex_unlock(&kvm->lock); |
d780592b | 1956 | vcpu_destroy: |
d40ccc62 | 1957 | kvm_arch_vcpu_destroy(vcpu); |
c5ea7660 AK |
1958 | return r; |
1959 | } | |
1960 | ||
1961d276 AK |
1961 | static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu *vcpu, sigset_t *sigset) |
1962 | { | |
1963 | if (sigset) { | |
1964 | sigdelsetmask(sigset, sigmask(SIGKILL)|sigmask(SIGSTOP)); | |
1965 | vcpu->sigset_active = 1; | |
1966 | vcpu->sigset = *sigset; | |
1967 | } else | |
1968 | vcpu->sigset_active = 0; | |
1969 | return 0; | |
1970 | } | |
1971 | ||
bccf2150 AK |
1972 | static long kvm_vcpu_ioctl(struct file *filp, |
1973 | unsigned int ioctl, unsigned long arg) | |
6aa8b732 | 1974 | { |
bccf2150 | 1975 | struct kvm_vcpu *vcpu = filp->private_data; |
2f366987 | 1976 | void __user *argp = (void __user *)arg; |
313a3dc7 | 1977 | int r; |
fa3795a7 DH |
1978 | struct kvm_fpu *fpu = NULL; |
1979 | struct kvm_sregs *kvm_sregs = NULL; | |
6aa8b732 | 1980 | |
6d4e4c4f AK |
1981 | if (vcpu->kvm->mm != current->mm) |
1982 | return -EIO; | |
2122ff5e | 1983 | |
2f4d9b54 | 1984 | #if defined(CONFIG_S390) || defined(CONFIG_PPC) || defined(CONFIG_MIPS) |
2122ff5e AK |
1985 | /* |
1986 | * Special cases: vcpu ioctls that are asynchronous to vcpu execution, | |
1987 | * so vcpu_load() would break it. | |
1988 | */ | |
1989 | if (ioctl == KVM_S390_INTERRUPT || ioctl == KVM_INTERRUPT) | |
1990 | return kvm_arch_vcpu_ioctl(filp, ioctl, arg); | |
1991 | #endif | |
1992 | ||
1993 | ||
9fc77441 MT |
1994 | r = vcpu_load(vcpu); |
1995 | if (r) | |
1996 | return r; | |
6aa8b732 | 1997 | switch (ioctl) { |
9a2bb7f4 | 1998 | case KVM_RUN: |
f0fe5108 AK |
1999 | r = -EINVAL; |
2000 | if (arg) | |
2001 | goto out; | |
b6c7a5dc | 2002 | r = kvm_arch_vcpu_ioctl_run(vcpu, vcpu->run); |
64be5007 | 2003 | trace_kvm_userspace_exit(vcpu->run->exit_reason, r); |
6aa8b732 | 2004 | break; |
6aa8b732 | 2005 | case KVM_GET_REGS: { |
3e4bb3ac | 2006 | struct kvm_regs *kvm_regs; |
6aa8b732 | 2007 | |
3e4bb3ac XZ |
2008 | r = -ENOMEM; |
2009 | kvm_regs = kzalloc(sizeof(struct kvm_regs), GFP_KERNEL); | |
2010 | if (!kvm_regs) | |
6aa8b732 | 2011 | goto out; |
3e4bb3ac XZ |
2012 | r = kvm_arch_vcpu_ioctl_get_regs(vcpu, kvm_regs); |
2013 | if (r) | |
2014 | goto out_free1; | |
6aa8b732 | 2015 | r = -EFAULT; |
3e4bb3ac XZ |
2016 | if (copy_to_user(argp, kvm_regs, sizeof(struct kvm_regs))) |
2017 | goto out_free1; | |
6aa8b732 | 2018 | r = 0; |
3e4bb3ac XZ |
2019 | out_free1: |
2020 | kfree(kvm_regs); | |
6aa8b732 AK |
2021 | break; |
2022 | } | |
2023 | case KVM_SET_REGS: { | |
3e4bb3ac | 2024 | struct kvm_regs *kvm_regs; |
6aa8b732 | 2025 | |
3e4bb3ac | 2026 | r = -ENOMEM; |
ff5c2c03 SL |
2027 | kvm_regs = memdup_user(argp, sizeof(*kvm_regs)); |
2028 | if (IS_ERR(kvm_regs)) { | |
2029 | r = PTR_ERR(kvm_regs); | |
6aa8b732 | 2030 | goto out; |
ff5c2c03 | 2031 | } |
3e4bb3ac | 2032 | r = kvm_arch_vcpu_ioctl_set_regs(vcpu, kvm_regs); |
3e4bb3ac | 2033 | kfree(kvm_regs); |
6aa8b732 AK |
2034 | break; |
2035 | } | |
2036 | case KVM_GET_SREGS: { | |
fa3795a7 DH |
2037 | kvm_sregs = kzalloc(sizeof(struct kvm_sregs), GFP_KERNEL); |
2038 | r = -ENOMEM; | |
2039 | if (!kvm_sregs) | |
2040 | goto out; | |
2041 | r = kvm_arch_vcpu_ioctl_get_sregs(vcpu, kvm_sregs); | |
6aa8b732 AK |
2042 | if (r) |
2043 | goto out; | |
2044 | r = -EFAULT; | |
fa3795a7 | 2045 | if (copy_to_user(argp, kvm_sregs, sizeof(struct kvm_sregs))) |
6aa8b732 AK |
2046 | goto out; |
2047 | r = 0; | |
2048 | break; | |
2049 | } | |
2050 | case KVM_SET_SREGS: { | |
ff5c2c03 SL |
2051 | kvm_sregs = memdup_user(argp, sizeof(*kvm_sregs)); |
2052 | if (IS_ERR(kvm_sregs)) { | |
2053 | r = PTR_ERR(kvm_sregs); | |
18595411 | 2054 | kvm_sregs = NULL; |
6aa8b732 | 2055 | goto out; |
ff5c2c03 | 2056 | } |
fa3795a7 | 2057 | r = kvm_arch_vcpu_ioctl_set_sregs(vcpu, kvm_sregs); |
6aa8b732 AK |
2058 | break; |
2059 | } | |
62d9f0db MT |
2060 | case KVM_GET_MP_STATE: { |
2061 | struct kvm_mp_state mp_state; | |
2062 | ||
2063 | r = kvm_arch_vcpu_ioctl_get_mpstate(vcpu, &mp_state); | |
2064 | if (r) | |
2065 | goto out; | |
2066 | r = -EFAULT; | |
2067 | if (copy_to_user(argp, &mp_state, sizeof mp_state)) | |
2068 | goto out; | |
2069 | r = 0; | |
2070 | break; | |
2071 | } | |
2072 | case KVM_SET_MP_STATE: { | |
2073 | struct kvm_mp_state mp_state; | |
2074 | ||
2075 | r = -EFAULT; | |
2076 | if (copy_from_user(&mp_state, argp, sizeof mp_state)) | |
2077 | goto out; | |
2078 | r = kvm_arch_vcpu_ioctl_set_mpstate(vcpu, &mp_state); | |
62d9f0db MT |
2079 | break; |
2080 | } | |
6aa8b732 AK |
2081 | case KVM_TRANSLATE: { |
2082 | struct kvm_translation tr; | |
2083 | ||
2084 | r = -EFAULT; | |
2f366987 | 2085 | if (copy_from_user(&tr, argp, sizeof tr)) |
6aa8b732 | 2086 | goto out; |
8b006791 | 2087 | r = kvm_arch_vcpu_ioctl_translate(vcpu, &tr); |
6aa8b732 AK |
2088 | if (r) |
2089 | goto out; | |
2090 | r = -EFAULT; | |
2f366987 | 2091 | if (copy_to_user(argp, &tr, sizeof tr)) |
6aa8b732 AK |
2092 | goto out; |
2093 | r = 0; | |
2094 | break; | |
2095 | } | |
d0bfb940 JK |
2096 | case KVM_SET_GUEST_DEBUG: { |
2097 | struct kvm_guest_debug dbg; | |
6aa8b732 AK |
2098 | |
2099 | r = -EFAULT; | |
2f366987 | 2100 | if (copy_from_user(&dbg, argp, sizeof dbg)) |
6aa8b732 | 2101 | goto out; |
d0bfb940 | 2102 | r = kvm_arch_vcpu_ioctl_set_guest_debug(vcpu, &dbg); |
6aa8b732 AK |
2103 | break; |
2104 | } | |
1961d276 AK |
2105 | case KVM_SET_SIGNAL_MASK: { |
2106 | struct kvm_signal_mask __user *sigmask_arg = argp; | |
2107 | struct kvm_signal_mask kvm_sigmask; | |
2108 | sigset_t sigset, *p; | |
2109 | ||
2110 | p = NULL; | |
2111 | if (argp) { | |
2112 | r = -EFAULT; | |
2113 | if (copy_from_user(&kvm_sigmask, argp, | |
2114 | sizeof kvm_sigmask)) | |
2115 | goto out; | |
2116 | r = -EINVAL; | |
2117 | if (kvm_sigmask.len != sizeof sigset) | |
2118 | goto out; | |
2119 | r = -EFAULT; | |
2120 | if (copy_from_user(&sigset, sigmask_arg->sigset, | |
2121 | sizeof sigset)) | |
2122 | goto out; | |
2123 | p = &sigset; | |
2124 | } | |
376d41ff | 2125 | r = kvm_vcpu_ioctl_set_sigmask(vcpu, p); |
1961d276 AK |
2126 | break; |
2127 | } | |
b8836737 | 2128 | case KVM_GET_FPU: { |
fa3795a7 DH |
2129 | fpu = kzalloc(sizeof(struct kvm_fpu), GFP_KERNEL); |
2130 | r = -ENOMEM; | |
2131 | if (!fpu) | |
2132 | goto out; | |
2133 | r = kvm_arch_vcpu_ioctl_get_fpu(vcpu, fpu); | |
b8836737 AK |
2134 | if (r) |
2135 | goto out; | |
2136 | r = -EFAULT; | |
fa3795a7 | 2137 | if (copy_to_user(argp, fpu, sizeof(struct kvm_fpu))) |
b8836737 AK |
2138 | goto out; |
2139 | r = 0; | |
2140 | break; | |
2141 | } | |
2142 | case KVM_SET_FPU: { | |
ff5c2c03 SL |
2143 | fpu = memdup_user(argp, sizeof(*fpu)); |
2144 | if (IS_ERR(fpu)) { | |
2145 | r = PTR_ERR(fpu); | |
18595411 | 2146 | fpu = NULL; |
b8836737 | 2147 | goto out; |
ff5c2c03 | 2148 | } |
fa3795a7 | 2149 | r = kvm_arch_vcpu_ioctl_set_fpu(vcpu, fpu); |
b8836737 AK |
2150 | break; |
2151 | } | |
bccf2150 | 2152 | default: |
313a3dc7 | 2153 | r = kvm_arch_vcpu_ioctl(filp, ioctl, arg); |
bccf2150 AK |
2154 | } |
2155 | out: | |
2122ff5e | 2156 | vcpu_put(vcpu); |
fa3795a7 DH |
2157 | kfree(fpu); |
2158 | kfree(kvm_sregs); | |
bccf2150 AK |
2159 | return r; |
2160 | } | |
2161 | ||
1dda606c AG |
2162 | #ifdef CONFIG_COMPAT |
2163 | static long kvm_vcpu_compat_ioctl(struct file *filp, | |
2164 | unsigned int ioctl, unsigned long arg) | |
2165 | { | |
2166 | struct kvm_vcpu *vcpu = filp->private_data; | |
2167 | void __user *argp = compat_ptr(arg); | |
2168 | int r; | |
2169 | ||
2170 | if (vcpu->kvm->mm != current->mm) | |
2171 | return -EIO; | |
2172 | ||
2173 | switch (ioctl) { | |
2174 | case KVM_SET_SIGNAL_MASK: { | |
2175 | struct kvm_signal_mask __user *sigmask_arg = argp; | |
2176 | struct kvm_signal_mask kvm_sigmask; | |
2177 | compat_sigset_t csigset; | |
2178 | sigset_t sigset; | |
2179 | ||
2180 | if (argp) { | |
2181 | r = -EFAULT; | |
2182 | if (copy_from_user(&kvm_sigmask, argp, | |
2183 | sizeof kvm_sigmask)) | |
2184 | goto out; | |
2185 | r = -EINVAL; | |
2186 | if (kvm_sigmask.len != sizeof csigset) | |
2187 | goto out; | |
2188 | r = -EFAULT; | |
2189 | if (copy_from_user(&csigset, sigmask_arg->sigset, | |
2190 | sizeof csigset)) | |
2191 | goto out; | |
760a9a30 AC |
2192 | sigset_from_compat(&sigset, &csigset); |
2193 | r = kvm_vcpu_ioctl_set_sigmask(vcpu, &sigset); | |
2194 | } else | |
2195 | r = kvm_vcpu_ioctl_set_sigmask(vcpu, NULL); | |
1dda606c AG |
2196 | break; |
2197 | } | |
2198 | default: | |
2199 | r = kvm_vcpu_ioctl(filp, ioctl, arg); | |
2200 | } | |
2201 | ||
2202 | out: | |
2203 | return r; | |
2204 | } | |
2205 | #endif | |
2206 | ||
bccf2150 AK |
2207 | static long kvm_vm_ioctl(struct file *filp, |
2208 | unsigned int ioctl, unsigned long arg) | |
2209 | { | |
2210 | struct kvm *kvm = filp->private_data; | |
2211 | void __user *argp = (void __user *)arg; | |
1fe779f8 | 2212 | int r; |
bccf2150 | 2213 | |
6d4e4c4f AK |
2214 | if (kvm->mm != current->mm) |
2215 | return -EIO; | |
bccf2150 AK |
2216 | switch (ioctl) { |
2217 | case KVM_CREATE_VCPU: | |
2218 | r = kvm_vm_ioctl_create_vcpu(kvm, arg); | |
bccf2150 | 2219 | break; |
6fc138d2 IE |
2220 | case KVM_SET_USER_MEMORY_REGION: { |
2221 | struct kvm_userspace_memory_region kvm_userspace_mem; | |
2222 | ||
2223 | r = -EFAULT; | |
2224 | if (copy_from_user(&kvm_userspace_mem, argp, | |
2225 | sizeof kvm_userspace_mem)) | |
2226 | goto out; | |
2227 | ||
f82a8cfe | 2228 | r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_userspace_mem, true); |
6aa8b732 AK |
2229 | break; |
2230 | } | |
2231 | case KVM_GET_DIRTY_LOG: { | |
2232 | struct kvm_dirty_log log; | |
2233 | ||
2234 | r = -EFAULT; | |
2f366987 | 2235 | if (copy_from_user(&log, argp, sizeof log)) |
6aa8b732 | 2236 | goto out; |
2c6f5df9 | 2237 | r = kvm_vm_ioctl_get_dirty_log(kvm, &log); |
6aa8b732 AK |
2238 | break; |
2239 | } | |
5f94c174 LV |
2240 | #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET |
2241 | case KVM_REGISTER_COALESCED_MMIO: { | |
2242 | struct kvm_coalesced_mmio_zone zone; | |
2243 | r = -EFAULT; | |
2244 | if (copy_from_user(&zone, argp, sizeof zone)) | |
2245 | goto out; | |
5f94c174 | 2246 | r = kvm_vm_ioctl_register_coalesced_mmio(kvm, &zone); |
5f94c174 LV |
2247 | break; |
2248 | } | |
2249 | case KVM_UNREGISTER_COALESCED_MMIO: { | |
2250 | struct kvm_coalesced_mmio_zone zone; | |
2251 | r = -EFAULT; | |
2252 | if (copy_from_user(&zone, argp, sizeof zone)) | |
2253 | goto out; | |
5f94c174 | 2254 | r = kvm_vm_ioctl_unregister_coalesced_mmio(kvm, &zone); |
5f94c174 LV |
2255 | break; |
2256 | } | |
2257 | #endif | |
721eecbf GH |
2258 | case KVM_IRQFD: { |
2259 | struct kvm_irqfd data; | |
2260 | ||
2261 | r = -EFAULT; | |
2262 | if (copy_from_user(&data, argp, sizeof data)) | |
2263 | goto out; | |
d4db2935 | 2264 | r = kvm_irqfd(kvm, &data); |
721eecbf GH |
2265 | break; |
2266 | } | |
d34e6b17 GH |
2267 | case KVM_IOEVENTFD: { |
2268 | struct kvm_ioeventfd data; | |
2269 | ||
2270 | r = -EFAULT; | |
2271 | if (copy_from_user(&data, argp, sizeof data)) | |
2272 | goto out; | |
2273 | r = kvm_ioeventfd(kvm, &data); | |
2274 | break; | |
2275 | } | |
73880c80 GN |
2276 | #ifdef CONFIG_KVM_APIC_ARCHITECTURE |
2277 | case KVM_SET_BOOT_CPU_ID: | |
2278 | r = 0; | |
894a9c55 | 2279 | mutex_lock(&kvm->lock); |
73880c80 GN |
2280 | if (atomic_read(&kvm->online_vcpus) != 0) |
2281 | r = -EBUSY; | |
2282 | else | |
2283 | kvm->bsp_vcpu_id = arg; | |
894a9c55 | 2284 | mutex_unlock(&kvm->lock); |
73880c80 | 2285 | break; |
07975ad3 JK |
2286 | #endif |
2287 | #ifdef CONFIG_HAVE_KVM_MSI | |
2288 | case KVM_SIGNAL_MSI: { | |
2289 | struct kvm_msi msi; | |
2290 | ||
2291 | r = -EFAULT; | |
2292 | if (copy_from_user(&msi, argp, sizeof msi)) | |
2293 | goto out; | |
2294 | r = kvm_send_userspace_msi(kvm, &msi); | |
2295 | break; | |
2296 | } | |
23d43cf9 CD |
2297 | #endif |
2298 | #ifdef __KVM_HAVE_IRQ_LINE | |
2299 | case KVM_IRQ_LINE_STATUS: | |
2300 | case KVM_IRQ_LINE: { | |
2301 | struct kvm_irq_level irq_event; | |
2302 | ||
2303 | r = -EFAULT; | |
2304 | if (copy_from_user(&irq_event, argp, sizeof irq_event)) | |
2305 | goto out; | |
2306 | ||
2307 | r = kvm_vm_ioctl_irq_line(kvm, &irq_event); | |
2308 | if (r) | |
2309 | goto out; | |
2310 | ||
2311 | r = -EFAULT; | |
2312 | if (ioctl == KVM_IRQ_LINE_STATUS) { | |
2313 | if (copy_to_user(argp, &irq_event, sizeof irq_event)) | |
2314 | goto out; | |
2315 | } | |
2316 | ||
2317 | r = 0; | |
2318 | break; | |
2319 | } | |
73880c80 | 2320 | #endif |
f17abe9a | 2321 | default: |
1fe779f8 | 2322 | r = kvm_arch_vm_ioctl(filp, ioctl, arg); |
bfd99ff5 AK |
2323 | if (r == -ENOTTY) |
2324 | r = kvm_vm_ioctl_assigned_device(kvm, ioctl, arg); | |
f17abe9a AK |
2325 | } |
2326 | out: | |
2327 | return r; | |
2328 | } | |
2329 | ||
6ff5894c AB |
2330 | #ifdef CONFIG_COMPAT |
2331 | struct compat_kvm_dirty_log { | |
2332 | __u32 slot; | |
2333 | __u32 padding1; | |
2334 | union { | |
2335 | compat_uptr_t dirty_bitmap; /* one bit per page */ | |
2336 | __u64 padding2; | |
2337 | }; | |
2338 | }; | |
2339 | ||
2340 | static long kvm_vm_compat_ioctl(struct file *filp, | |
2341 | unsigned int ioctl, unsigned long arg) | |
2342 | { | |
2343 | struct kvm *kvm = filp->private_data; | |
2344 | int r; | |
2345 | ||
2346 | if (kvm->mm != current->mm) | |
2347 | return -EIO; | |
2348 | switch (ioctl) { | |
2349 | case KVM_GET_DIRTY_LOG: { | |
2350 | struct compat_kvm_dirty_log compat_log; | |
2351 | struct kvm_dirty_log log; | |
2352 | ||
2353 | r = -EFAULT; | |
2354 | if (copy_from_user(&compat_log, (void __user *)arg, | |
2355 | sizeof(compat_log))) | |
2356 | goto out; | |
2357 | log.slot = compat_log.slot; | |
2358 | log.padding1 = compat_log.padding1; | |
2359 | log.padding2 = compat_log.padding2; | |
2360 | log.dirty_bitmap = compat_ptr(compat_log.dirty_bitmap); | |
2361 | ||
2362 | r = kvm_vm_ioctl_get_dirty_log(kvm, &log); | |
6ff5894c AB |
2363 | break; |
2364 | } | |
2365 | default: | |
2366 | r = kvm_vm_ioctl(filp, ioctl, arg); | |
2367 | } | |
2368 | ||
2369 | out: | |
2370 | return r; | |
2371 | } | |
2372 | #endif | |
2373 | ||
e4a533a4 | 2374 | static int kvm_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf) |
f17abe9a | 2375 | { |
777b3f49 MT |
2376 | struct page *page[1]; |
2377 | unsigned long addr; | |
2378 | int npages; | |
2379 | gfn_t gfn = vmf->pgoff; | |
f17abe9a | 2380 | struct kvm *kvm = vma->vm_file->private_data; |
f17abe9a | 2381 | |
777b3f49 MT |
2382 | addr = gfn_to_hva(kvm, gfn); |
2383 | if (kvm_is_error_hva(addr)) | |
e4a533a4 | 2384 | return VM_FAULT_SIGBUS; |
777b3f49 MT |
2385 | |
2386 | npages = get_user_pages(current, current->mm, addr, 1, 1, 0, page, | |
2387 | NULL); | |
2388 | if (unlikely(npages != 1)) | |
e4a533a4 | 2389 | return VM_FAULT_SIGBUS; |
777b3f49 MT |
2390 | |
2391 | vmf->page = page[0]; | |
e4a533a4 | 2392 | return 0; |
f17abe9a AK |
2393 | } |
2394 | ||
f0f37e2f | 2395 | static const struct vm_operations_struct kvm_vm_vm_ops = { |
e4a533a4 | 2396 | .fault = kvm_vm_fault, |
f17abe9a AK |
2397 | }; |
2398 | ||
2399 | static int kvm_vm_mmap(struct file *file, struct vm_area_struct *vma) | |
2400 | { | |
2401 | vma->vm_ops = &kvm_vm_vm_ops; | |
2402 | return 0; | |
2403 | } | |
2404 | ||
3d3aab1b | 2405 | static struct file_operations kvm_vm_fops = { |
f17abe9a AK |
2406 | .release = kvm_vm_release, |
2407 | .unlocked_ioctl = kvm_vm_ioctl, | |
6ff5894c AB |
2408 | #ifdef CONFIG_COMPAT |
2409 | .compat_ioctl = kvm_vm_compat_ioctl, | |
2410 | #endif | |
f17abe9a | 2411 | .mmap = kvm_vm_mmap, |
6038f373 | 2412 | .llseek = noop_llseek, |
f17abe9a AK |
2413 | }; |
2414 | ||
e08b9637 | 2415 | static int kvm_dev_ioctl_create_vm(unsigned long type) |
f17abe9a | 2416 | { |
aac87636 | 2417 | int r; |
f17abe9a AK |
2418 | struct kvm *kvm; |
2419 | ||
e08b9637 | 2420 | kvm = kvm_create_vm(type); |
d6d28168 AK |
2421 | if (IS_ERR(kvm)) |
2422 | return PTR_ERR(kvm); | |
6ce5a090 TY |
2423 | #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET |
2424 | r = kvm_coalesced_mmio_init(kvm); | |
2425 | if (r < 0) { | |
2426 | kvm_put_kvm(kvm); | |
2427 | return r; | |
2428 | } | |
2429 | #endif | |
aac87636 HC |
2430 | r = anon_inode_getfd("kvm-vm", &kvm_vm_fops, kvm, O_RDWR); |
2431 | if (r < 0) | |
66c0b394 | 2432 | kvm_put_kvm(kvm); |
f17abe9a | 2433 | |
aac87636 | 2434 | return r; |
f17abe9a AK |
2435 | } |
2436 | ||
1a811b61 AK |
2437 | static long kvm_dev_ioctl_check_extension_generic(long arg) |
2438 | { | |
2439 | switch (arg) { | |
ca9edaee | 2440 | case KVM_CAP_USER_MEMORY: |
1a811b61 | 2441 | case KVM_CAP_DESTROY_MEMORY_REGION_WORKS: |
4cd481f6 | 2442 | case KVM_CAP_JOIN_MEMORY_REGIONS_WORKS: |
73880c80 GN |
2443 | #ifdef CONFIG_KVM_APIC_ARCHITECTURE |
2444 | case KVM_CAP_SET_BOOT_CPU_ID: | |
2445 | #endif | |
a9c7399d | 2446 | case KVM_CAP_INTERNAL_ERROR_DATA: |
07975ad3 JK |
2447 | #ifdef CONFIG_HAVE_KVM_MSI |
2448 | case KVM_CAP_SIGNAL_MSI: | |
2449 | #endif | |
1a811b61 | 2450 | return 1; |
9900b4b4 | 2451 | #ifdef KVM_CAP_IRQ_ROUTING |
399ec807 | 2452 | case KVM_CAP_IRQ_ROUTING: |
36463146 | 2453 | return KVM_MAX_IRQ_ROUTES; |
399ec807 | 2454 | #endif |
1a811b61 AK |
2455 | default: |
2456 | break; | |
2457 | } | |
2458 | return kvm_dev_ioctl_check_extension(arg); | |
2459 | } | |
2460 | ||
f17abe9a AK |
2461 | static long kvm_dev_ioctl(struct file *filp, |
2462 | unsigned int ioctl, unsigned long arg) | |
2463 | { | |
07c45a36 | 2464 | long r = -EINVAL; |
f17abe9a AK |
2465 | |
2466 | switch (ioctl) { | |
2467 | case KVM_GET_API_VERSION: | |
f0fe5108 AK |
2468 | r = -EINVAL; |
2469 | if (arg) | |
2470 | goto out; | |
f17abe9a AK |
2471 | r = KVM_API_VERSION; |
2472 | break; | |
2473 | case KVM_CREATE_VM: | |
e08b9637 | 2474 | r = kvm_dev_ioctl_create_vm(arg); |
f17abe9a | 2475 | break; |
018d00d2 | 2476 | case KVM_CHECK_EXTENSION: |
1a811b61 | 2477 | r = kvm_dev_ioctl_check_extension_generic(arg); |
5d308f45 | 2478 | break; |
07c45a36 AK |
2479 | case KVM_GET_VCPU_MMAP_SIZE: |
2480 | r = -EINVAL; | |
2481 | if (arg) | |
2482 | goto out; | |
adb1ff46 AK |
2483 | r = PAGE_SIZE; /* struct kvm_run */ |
2484 | #ifdef CONFIG_X86 | |
2485 | r += PAGE_SIZE; /* pio data page */ | |
5f94c174 LV |
2486 | #endif |
2487 | #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET | |
2488 | r += PAGE_SIZE; /* coalesced mmio ring page */ | |
adb1ff46 | 2489 | #endif |
07c45a36 | 2490 | break; |
d4c9ff2d FEL |
2491 | case KVM_TRACE_ENABLE: |
2492 | case KVM_TRACE_PAUSE: | |
2493 | case KVM_TRACE_DISABLE: | |
2023a29c | 2494 | r = -EOPNOTSUPP; |
d4c9ff2d | 2495 | break; |
6aa8b732 | 2496 | default: |
043405e1 | 2497 | return kvm_arch_dev_ioctl(filp, ioctl, arg); |
6aa8b732 AK |
2498 | } |
2499 | out: | |
2500 | return r; | |
2501 | } | |
2502 | ||
6aa8b732 | 2503 | static struct file_operations kvm_chardev_ops = { |
6aa8b732 AK |
2504 | .unlocked_ioctl = kvm_dev_ioctl, |
2505 | .compat_ioctl = kvm_dev_ioctl, | |
6038f373 | 2506 | .llseek = noop_llseek, |
6aa8b732 AK |
2507 | }; |
2508 | ||
2509 | static struct miscdevice kvm_dev = { | |
bbe4432e | 2510 | KVM_MINOR, |
6aa8b732 AK |
2511 | "kvm", |
2512 | &kvm_chardev_ops, | |
2513 | }; | |
2514 | ||
75b7127c | 2515 | static void hardware_enable_nolock(void *junk) |
1b6c0168 AK |
2516 | { |
2517 | int cpu = raw_smp_processor_id(); | |
10474ae8 | 2518 | int r; |
1b6c0168 | 2519 | |
7f59f492 | 2520 | if (cpumask_test_cpu(cpu, cpus_hardware_enabled)) |
1b6c0168 | 2521 | return; |
10474ae8 | 2522 | |
7f59f492 | 2523 | cpumask_set_cpu(cpu, cpus_hardware_enabled); |
10474ae8 AG |
2524 | |
2525 | r = kvm_arch_hardware_enable(NULL); | |
2526 | ||
2527 | if (r) { | |
2528 | cpumask_clear_cpu(cpu, cpus_hardware_enabled); | |
2529 | atomic_inc(&hardware_enable_failed); | |
2530 | printk(KERN_INFO "kvm: enabling virtualization on " | |
2531 | "CPU%d failed\n", cpu); | |
2532 | } | |
1b6c0168 AK |
2533 | } |
2534 | ||
75b7127c TY |
2535 | static void hardware_enable(void *junk) |
2536 | { | |
e935b837 | 2537 | raw_spin_lock(&kvm_lock); |
75b7127c | 2538 | hardware_enable_nolock(junk); |
e935b837 | 2539 | raw_spin_unlock(&kvm_lock); |
75b7127c TY |
2540 | } |
2541 | ||
2542 | static void hardware_disable_nolock(void *junk) | |
1b6c0168 AK |
2543 | { |
2544 | int cpu = raw_smp_processor_id(); | |
2545 | ||
7f59f492 | 2546 | if (!cpumask_test_cpu(cpu, cpus_hardware_enabled)) |
1b6c0168 | 2547 | return; |
7f59f492 | 2548 | cpumask_clear_cpu(cpu, cpus_hardware_enabled); |
e9b11c17 | 2549 | kvm_arch_hardware_disable(NULL); |
1b6c0168 AK |
2550 | } |
2551 | ||
75b7127c TY |
2552 | static void hardware_disable(void *junk) |
2553 | { | |
e935b837 | 2554 | raw_spin_lock(&kvm_lock); |
75b7127c | 2555 | hardware_disable_nolock(junk); |
e935b837 | 2556 | raw_spin_unlock(&kvm_lock); |
75b7127c TY |
2557 | } |
2558 | ||
10474ae8 AG |
2559 | static void hardware_disable_all_nolock(void) |
2560 | { | |
2561 | BUG_ON(!kvm_usage_count); | |
2562 | ||
2563 | kvm_usage_count--; | |
2564 | if (!kvm_usage_count) | |
75b7127c | 2565 | on_each_cpu(hardware_disable_nolock, NULL, 1); |
10474ae8 AG |
2566 | } |
2567 | ||
2568 | static void hardware_disable_all(void) | |
2569 | { | |
e935b837 | 2570 | raw_spin_lock(&kvm_lock); |
10474ae8 | 2571 | hardware_disable_all_nolock(); |
e935b837 | 2572 | raw_spin_unlock(&kvm_lock); |
10474ae8 AG |
2573 | } |
2574 | ||
2575 | static int hardware_enable_all(void) | |
2576 | { | |
2577 | int r = 0; | |
2578 | ||
e935b837 | 2579 | raw_spin_lock(&kvm_lock); |
10474ae8 AG |
2580 | |
2581 | kvm_usage_count++; | |
2582 | if (kvm_usage_count == 1) { | |
2583 | atomic_set(&hardware_enable_failed, 0); | |
75b7127c | 2584 | on_each_cpu(hardware_enable_nolock, NULL, 1); |
10474ae8 AG |
2585 | |
2586 | if (atomic_read(&hardware_enable_failed)) { | |
2587 | hardware_disable_all_nolock(); | |
2588 | r = -EBUSY; | |
2589 | } | |
2590 | } | |
2591 | ||
e935b837 | 2592 | raw_spin_unlock(&kvm_lock); |
10474ae8 AG |
2593 | |
2594 | return r; | |
2595 | } | |
2596 | ||
774c47f1 AK |
2597 | static int kvm_cpu_hotplug(struct notifier_block *notifier, unsigned long val, |
2598 | void *v) | |
2599 | { | |
2600 | int cpu = (long)v; | |
2601 | ||
10474ae8 AG |
2602 | if (!kvm_usage_count) |
2603 | return NOTIFY_OK; | |
2604 | ||
1a6f4d7f | 2605 | val &= ~CPU_TASKS_FROZEN; |
774c47f1 | 2606 | switch (val) { |
cec9ad27 | 2607 | case CPU_DYING: |
6ec8a856 AK |
2608 | printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n", |
2609 | cpu); | |
2610 | hardware_disable(NULL); | |
2611 | break; | |
da908f2f | 2612 | case CPU_STARTING: |
43934a38 JK |
2613 | printk(KERN_INFO "kvm: enabling virtualization on CPU%d\n", |
2614 | cpu); | |
da908f2f | 2615 | hardware_enable(NULL); |
774c47f1 AK |
2616 | break; |
2617 | } | |
2618 | return NOTIFY_OK; | |
2619 | } | |
2620 | ||
4ecac3fd | 2621 | |
b7c4145b | 2622 | asmlinkage void kvm_spurious_fault(void) |
4ecac3fd | 2623 | { |
4ecac3fd AK |
2624 | /* Fault while not rebooting. We want the trace. */ |
2625 | BUG(); | |
2626 | } | |
b7c4145b | 2627 | EXPORT_SYMBOL_GPL(kvm_spurious_fault); |
4ecac3fd | 2628 | |
9a2b85c6 | 2629 | static int kvm_reboot(struct notifier_block *notifier, unsigned long val, |
d77c26fc | 2630 | void *v) |
9a2b85c6 | 2631 | { |
8e1c1815 SY |
2632 | /* |
2633 | * Some (well, at least mine) BIOSes hang on reboot if | |
2634 | * in vmx root mode. | |
2635 | * | |
2636 | * And Intel TXT required VMX off for all cpu when system shutdown. | |
2637 | */ | |
2638 | printk(KERN_INFO "kvm: exiting hardware virtualization\n"); | |
2639 | kvm_rebooting = true; | |
75b7127c | 2640 | on_each_cpu(hardware_disable_nolock, NULL, 1); |
9a2b85c6 RR |
2641 | return NOTIFY_OK; |
2642 | } | |
2643 | ||
2644 | static struct notifier_block kvm_reboot_notifier = { | |
2645 | .notifier_call = kvm_reboot, | |
2646 | .priority = 0, | |
2647 | }; | |
2648 | ||
e93f8a0f | 2649 | static void kvm_io_bus_destroy(struct kvm_io_bus *bus) |
2eeb2e94 GH |
2650 | { |
2651 | int i; | |
2652 | ||
2653 | for (i = 0; i < bus->dev_count; i++) { | |
743eeb0b | 2654 | struct kvm_io_device *pos = bus->range[i].dev; |
2eeb2e94 GH |
2655 | |
2656 | kvm_iodevice_destructor(pos); | |
2657 | } | |
e93f8a0f | 2658 | kfree(bus); |
2eeb2e94 GH |
2659 | } |
2660 | ||
743eeb0b SL |
2661 | int kvm_io_bus_sort_cmp(const void *p1, const void *p2) |
2662 | { | |
2663 | const struct kvm_io_range *r1 = p1; | |
2664 | const struct kvm_io_range *r2 = p2; | |
2665 | ||
2666 | if (r1->addr < r2->addr) | |
2667 | return -1; | |
2668 | if (r1->addr + r1->len > r2->addr + r2->len) | |
2669 | return 1; | |
2670 | return 0; | |
2671 | } | |
2672 | ||
2673 | int kvm_io_bus_insert_dev(struct kvm_io_bus *bus, struct kvm_io_device *dev, | |
2674 | gpa_t addr, int len) | |
2675 | { | |
743eeb0b SL |
2676 | bus->range[bus->dev_count++] = (struct kvm_io_range) { |
2677 | .addr = addr, | |
2678 | .len = len, | |
2679 | .dev = dev, | |
2680 | }; | |
2681 | ||
2682 | sort(bus->range, bus->dev_count, sizeof(struct kvm_io_range), | |
2683 | kvm_io_bus_sort_cmp, NULL); | |
2684 | ||
2685 | return 0; | |
2686 | } | |
2687 | ||
2688 | int kvm_io_bus_get_first_dev(struct kvm_io_bus *bus, | |
2689 | gpa_t addr, int len) | |
2690 | { | |
2691 | struct kvm_io_range *range, key; | |
2692 | int off; | |
2693 | ||
2694 | key = (struct kvm_io_range) { | |
2695 | .addr = addr, | |
2696 | .len = len, | |
2697 | }; | |
2698 | ||
2699 | range = bsearch(&key, bus->range, bus->dev_count, | |
2700 | sizeof(struct kvm_io_range), kvm_io_bus_sort_cmp); | |
2701 | if (range == NULL) | |
2702 | return -ENOENT; | |
2703 | ||
2704 | off = range - bus->range; | |
2705 | ||
2706 | while (off > 0 && kvm_io_bus_sort_cmp(&key, &bus->range[off-1]) == 0) | |
2707 | off--; | |
2708 | ||
2709 | return off; | |
2710 | } | |
2711 | ||
bda9020e | 2712 | /* kvm_io_bus_write - called under kvm->slots_lock */ |
e93f8a0f | 2713 | int kvm_io_bus_write(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr, |
bda9020e | 2714 | int len, const void *val) |
2eeb2e94 | 2715 | { |
743eeb0b | 2716 | int idx; |
90d83dc3 | 2717 | struct kvm_io_bus *bus; |
743eeb0b SL |
2718 | struct kvm_io_range range; |
2719 | ||
2720 | range = (struct kvm_io_range) { | |
2721 | .addr = addr, | |
2722 | .len = len, | |
2723 | }; | |
90d83dc3 LJ |
2724 | |
2725 | bus = srcu_dereference(kvm->buses[bus_idx], &kvm->srcu); | |
743eeb0b SL |
2726 | idx = kvm_io_bus_get_first_dev(bus, addr, len); |
2727 | if (idx < 0) | |
2728 | return -EOPNOTSUPP; | |
2729 | ||
2730 | while (idx < bus->dev_count && | |
2731 | kvm_io_bus_sort_cmp(&range, &bus->range[idx]) == 0) { | |
2732 | if (!kvm_iodevice_write(bus->range[idx].dev, addr, len, val)) | |
bda9020e | 2733 | return 0; |
743eeb0b SL |
2734 | idx++; |
2735 | } | |
2736 | ||
bda9020e MT |
2737 | return -EOPNOTSUPP; |
2738 | } | |
2eeb2e94 | 2739 | |
bda9020e | 2740 | /* kvm_io_bus_read - called under kvm->slots_lock */ |
e93f8a0f MT |
2741 | int kvm_io_bus_read(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr, |
2742 | int len, void *val) | |
bda9020e | 2743 | { |
743eeb0b | 2744 | int idx; |
90d83dc3 | 2745 | struct kvm_io_bus *bus; |
743eeb0b SL |
2746 | struct kvm_io_range range; |
2747 | ||
2748 | range = (struct kvm_io_range) { | |
2749 | .addr = addr, | |
2750 | .len = len, | |
2751 | }; | |
e93f8a0f | 2752 | |
90d83dc3 | 2753 | bus = srcu_dereference(kvm->buses[bus_idx], &kvm->srcu); |
743eeb0b SL |
2754 | idx = kvm_io_bus_get_first_dev(bus, addr, len); |
2755 | if (idx < 0) | |
2756 | return -EOPNOTSUPP; | |
2757 | ||
2758 | while (idx < bus->dev_count && | |
2759 | kvm_io_bus_sort_cmp(&range, &bus->range[idx]) == 0) { | |
2760 | if (!kvm_iodevice_read(bus->range[idx].dev, addr, len, val)) | |
bda9020e | 2761 | return 0; |
743eeb0b SL |
2762 | idx++; |
2763 | } | |
2764 | ||
bda9020e | 2765 | return -EOPNOTSUPP; |
2eeb2e94 GH |
2766 | } |
2767 | ||
79fac95e | 2768 | /* Caller must hold slots_lock. */ |
743eeb0b SL |
2769 | int kvm_io_bus_register_dev(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr, |
2770 | int len, struct kvm_io_device *dev) | |
6c474694 | 2771 | { |
e93f8a0f | 2772 | struct kvm_io_bus *new_bus, *bus; |
090b7aff | 2773 | |
e93f8a0f | 2774 | bus = kvm->buses[bus_idx]; |
a1300716 | 2775 | if (bus->dev_count > NR_IOBUS_DEVS - 1) |
090b7aff | 2776 | return -ENOSPC; |
2eeb2e94 | 2777 | |
a1300716 AK |
2778 | new_bus = kzalloc(sizeof(*bus) + ((bus->dev_count + 1) * |
2779 | sizeof(struct kvm_io_range)), GFP_KERNEL); | |
e93f8a0f MT |
2780 | if (!new_bus) |
2781 | return -ENOMEM; | |
a1300716 AK |
2782 | memcpy(new_bus, bus, sizeof(*bus) + (bus->dev_count * |
2783 | sizeof(struct kvm_io_range))); | |
743eeb0b | 2784 | kvm_io_bus_insert_dev(new_bus, dev, addr, len); |
e93f8a0f MT |
2785 | rcu_assign_pointer(kvm->buses[bus_idx], new_bus); |
2786 | synchronize_srcu_expedited(&kvm->srcu); | |
2787 | kfree(bus); | |
090b7aff GH |
2788 | |
2789 | return 0; | |
2790 | } | |
2791 | ||
79fac95e | 2792 | /* Caller must hold slots_lock. */ |
e93f8a0f MT |
2793 | int kvm_io_bus_unregister_dev(struct kvm *kvm, enum kvm_bus bus_idx, |
2794 | struct kvm_io_device *dev) | |
090b7aff | 2795 | { |
e93f8a0f MT |
2796 | int i, r; |
2797 | struct kvm_io_bus *new_bus, *bus; | |
090b7aff | 2798 | |
cdfca7b3 | 2799 | bus = kvm->buses[bus_idx]; |
e93f8a0f | 2800 | r = -ENOENT; |
a1300716 AK |
2801 | for (i = 0; i < bus->dev_count; i++) |
2802 | if (bus->range[i].dev == dev) { | |
e93f8a0f | 2803 | r = 0; |
090b7aff GH |
2804 | break; |
2805 | } | |
e93f8a0f | 2806 | |
a1300716 | 2807 | if (r) |
e93f8a0f | 2808 | return r; |
a1300716 AK |
2809 | |
2810 | new_bus = kzalloc(sizeof(*bus) + ((bus->dev_count - 1) * | |
2811 | sizeof(struct kvm_io_range)), GFP_KERNEL); | |
2812 | if (!new_bus) | |
2813 | return -ENOMEM; | |
2814 | ||
2815 | memcpy(new_bus, bus, sizeof(*bus) + i * sizeof(struct kvm_io_range)); | |
2816 | new_bus->dev_count--; | |
2817 | memcpy(new_bus->range + i, bus->range + i + 1, | |
2818 | (new_bus->dev_count - i) * sizeof(struct kvm_io_range)); | |
e93f8a0f MT |
2819 | |
2820 | rcu_assign_pointer(kvm->buses[bus_idx], new_bus); | |
2821 | synchronize_srcu_expedited(&kvm->srcu); | |
2822 | kfree(bus); | |
2823 | return r; | |
2eeb2e94 GH |
2824 | } |
2825 | ||
774c47f1 AK |
2826 | static struct notifier_block kvm_cpu_notifier = { |
2827 | .notifier_call = kvm_cpu_hotplug, | |
774c47f1 AK |
2828 | }; |
2829 | ||
8b88b099 | 2830 | static int vm_stat_get(void *_offset, u64 *val) |
ba1389b7 AK |
2831 | { |
2832 | unsigned offset = (long)_offset; | |
ba1389b7 AK |
2833 | struct kvm *kvm; |
2834 | ||
8b88b099 | 2835 | *val = 0; |
e935b837 | 2836 | raw_spin_lock(&kvm_lock); |
ba1389b7 | 2837 | list_for_each_entry(kvm, &vm_list, vm_list) |
8b88b099 | 2838 | *val += *(u32 *)((void *)kvm + offset); |
e935b837 | 2839 | raw_spin_unlock(&kvm_lock); |
8b88b099 | 2840 | return 0; |
ba1389b7 AK |
2841 | } |
2842 | ||
2843 | DEFINE_SIMPLE_ATTRIBUTE(vm_stat_fops, vm_stat_get, NULL, "%llu\n"); | |
2844 | ||
8b88b099 | 2845 | static int vcpu_stat_get(void *_offset, u64 *val) |
1165f5fe AK |
2846 | { |
2847 | unsigned offset = (long)_offset; | |
1165f5fe AK |
2848 | struct kvm *kvm; |
2849 | struct kvm_vcpu *vcpu; | |
2850 | int i; | |
2851 | ||
8b88b099 | 2852 | *val = 0; |
e935b837 | 2853 | raw_spin_lock(&kvm_lock); |
1165f5fe | 2854 | list_for_each_entry(kvm, &vm_list, vm_list) |
988a2cae GN |
2855 | kvm_for_each_vcpu(i, vcpu, kvm) |
2856 | *val += *(u32 *)((void *)vcpu + offset); | |
2857 | ||
e935b837 | 2858 | raw_spin_unlock(&kvm_lock); |
8b88b099 | 2859 | return 0; |
1165f5fe AK |
2860 | } |
2861 | ||
ba1389b7 AK |
2862 | DEFINE_SIMPLE_ATTRIBUTE(vcpu_stat_fops, vcpu_stat_get, NULL, "%llu\n"); |
2863 | ||
828c0950 | 2864 | static const struct file_operations *stat_fops[] = { |
ba1389b7 AK |
2865 | [KVM_STAT_VCPU] = &vcpu_stat_fops, |
2866 | [KVM_STAT_VM] = &vm_stat_fops, | |
2867 | }; | |
1165f5fe | 2868 | |
4f69b680 | 2869 | static int kvm_init_debug(void) |
6aa8b732 | 2870 | { |
4f69b680 | 2871 | int r = -EFAULT; |
6aa8b732 AK |
2872 | struct kvm_stats_debugfs_item *p; |
2873 | ||
76f7c879 | 2874 | kvm_debugfs_dir = debugfs_create_dir("kvm", NULL); |
4f69b680 H |
2875 | if (kvm_debugfs_dir == NULL) |
2876 | goto out; | |
2877 | ||
2878 | for (p = debugfs_entries; p->name; ++p) { | |
76f7c879 | 2879 | p->dentry = debugfs_create_file(p->name, 0444, kvm_debugfs_dir, |
1165f5fe | 2880 | (void *)(long)p->offset, |
ba1389b7 | 2881 | stat_fops[p->kind]); |
4f69b680 H |
2882 | if (p->dentry == NULL) |
2883 | goto out_dir; | |
2884 | } | |
2885 | ||
2886 | return 0; | |
2887 | ||
2888 | out_dir: | |
2889 | debugfs_remove_recursive(kvm_debugfs_dir); | |
2890 | out: | |
2891 | return r; | |
6aa8b732 AK |
2892 | } |
2893 | ||
2894 | static void kvm_exit_debug(void) | |
2895 | { | |
2896 | struct kvm_stats_debugfs_item *p; | |
2897 | ||
2898 | for (p = debugfs_entries; p->name; ++p) | |
2899 | debugfs_remove(p->dentry); | |
76f7c879 | 2900 | debugfs_remove(kvm_debugfs_dir); |
6aa8b732 AK |
2901 | } |
2902 | ||
fb3600cc | 2903 | static int kvm_suspend(void) |
59ae6c6b | 2904 | { |
10474ae8 | 2905 | if (kvm_usage_count) |
75b7127c | 2906 | hardware_disable_nolock(NULL); |
59ae6c6b AK |
2907 | return 0; |
2908 | } | |
2909 | ||
fb3600cc | 2910 | static void kvm_resume(void) |
59ae6c6b | 2911 | { |
ca84d1a2 | 2912 | if (kvm_usage_count) { |
e935b837 | 2913 | WARN_ON(raw_spin_is_locked(&kvm_lock)); |
75b7127c | 2914 | hardware_enable_nolock(NULL); |
ca84d1a2 | 2915 | } |
59ae6c6b AK |
2916 | } |
2917 | ||
fb3600cc | 2918 | static struct syscore_ops kvm_syscore_ops = { |
59ae6c6b AK |
2919 | .suspend = kvm_suspend, |
2920 | .resume = kvm_resume, | |
2921 | }; | |
2922 | ||
15ad7146 AK |
2923 | static inline |
2924 | struct kvm_vcpu *preempt_notifier_to_vcpu(struct preempt_notifier *pn) | |
2925 | { | |
2926 | return container_of(pn, struct kvm_vcpu, preempt_notifier); | |
2927 | } | |
2928 | ||
2929 | static void kvm_sched_in(struct preempt_notifier *pn, int cpu) | |
2930 | { | |
2931 | struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn); | |
2932 | ||
e9b11c17 | 2933 | kvm_arch_vcpu_load(vcpu, cpu); |
15ad7146 AK |
2934 | } |
2935 | ||
2936 | static void kvm_sched_out(struct preempt_notifier *pn, | |
2937 | struct task_struct *next) | |
2938 | { | |
2939 | struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn); | |
2940 | ||
e9b11c17 | 2941 | kvm_arch_vcpu_put(vcpu); |
15ad7146 AK |
2942 | } |
2943 | ||
0ee75bea | 2944 | int kvm_init(void *opaque, unsigned vcpu_size, unsigned vcpu_align, |
c16f862d | 2945 | struct module *module) |
6aa8b732 AK |
2946 | { |
2947 | int r; | |
002c7f7c | 2948 | int cpu; |
6aa8b732 | 2949 | |
f8c16bba ZX |
2950 | r = kvm_arch_init(opaque); |
2951 | if (r) | |
d2308784 | 2952 | goto out_fail; |
cb498ea2 | 2953 | |
8437a617 | 2954 | if (!zalloc_cpumask_var(&cpus_hardware_enabled, GFP_KERNEL)) { |
7f59f492 RR |
2955 | r = -ENOMEM; |
2956 | goto out_free_0; | |
2957 | } | |
2958 | ||
e9b11c17 | 2959 | r = kvm_arch_hardware_setup(); |
6aa8b732 | 2960 | if (r < 0) |
7f59f492 | 2961 | goto out_free_0a; |
6aa8b732 | 2962 | |
002c7f7c YS |
2963 | for_each_online_cpu(cpu) { |
2964 | smp_call_function_single(cpu, | |
e9b11c17 | 2965 | kvm_arch_check_processor_compat, |
8691e5a8 | 2966 | &r, 1); |
002c7f7c | 2967 | if (r < 0) |
d2308784 | 2968 | goto out_free_1; |
002c7f7c YS |
2969 | } |
2970 | ||
774c47f1 AK |
2971 | r = register_cpu_notifier(&kvm_cpu_notifier); |
2972 | if (r) | |
d2308784 | 2973 | goto out_free_2; |
6aa8b732 AK |
2974 | register_reboot_notifier(&kvm_reboot_notifier); |
2975 | ||
c16f862d | 2976 | /* A kmem cache lets us meet the alignment requirements of fx_save. */ |
0ee75bea AK |
2977 | if (!vcpu_align) |
2978 | vcpu_align = __alignof__(struct kvm_vcpu); | |
2979 | kvm_vcpu_cache = kmem_cache_create("kvm_vcpu", vcpu_size, vcpu_align, | |
56919c5c | 2980 | 0, NULL); |
c16f862d RR |
2981 | if (!kvm_vcpu_cache) { |
2982 | r = -ENOMEM; | |
fb3600cc | 2983 | goto out_free_3; |
c16f862d RR |
2984 | } |
2985 | ||
af585b92 GN |
2986 | r = kvm_async_pf_init(); |
2987 | if (r) | |
2988 | goto out_free; | |
2989 | ||
6aa8b732 | 2990 | kvm_chardev_ops.owner = module; |
3d3aab1b CB |
2991 | kvm_vm_fops.owner = module; |
2992 | kvm_vcpu_fops.owner = module; | |
6aa8b732 AK |
2993 | |
2994 | r = misc_register(&kvm_dev); | |
2995 | if (r) { | |
d77c26fc | 2996 | printk(KERN_ERR "kvm: misc device register failed\n"); |
af585b92 | 2997 | goto out_unreg; |
6aa8b732 AK |
2998 | } |
2999 | ||
fb3600cc RW |
3000 | register_syscore_ops(&kvm_syscore_ops); |
3001 | ||
15ad7146 AK |
3002 | kvm_preempt_ops.sched_in = kvm_sched_in; |
3003 | kvm_preempt_ops.sched_out = kvm_sched_out; | |
3004 | ||
4f69b680 H |
3005 | r = kvm_init_debug(); |
3006 | if (r) { | |
3007 | printk(KERN_ERR "kvm: create debugfs files failed\n"); | |
3008 | goto out_undebugfs; | |
3009 | } | |
0ea4ed8e | 3010 | |
c7addb90 | 3011 | return 0; |
6aa8b732 | 3012 | |
4f69b680 H |
3013 | out_undebugfs: |
3014 | unregister_syscore_ops(&kvm_syscore_ops); | |
af585b92 GN |
3015 | out_unreg: |
3016 | kvm_async_pf_deinit(); | |
6aa8b732 | 3017 | out_free: |
c16f862d | 3018 | kmem_cache_destroy(kvm_vcpu_cache); |
d2308784 | 3019 | out_free_3: |
6aa8b732 | 3020 | unregister_reboot_notifier(&kvm_reboot_notifier); |
774c47f1 | 3021 | unregister_cpu_notifier(&kvm_cpu_notifier); |
d2308784 | 3022 | out_free_2: |
d2308784 | 3023 | out_free_1: |
e9b11c17 | 3024 | kvm_arch_hardware_unsetup(); |
7f59f492 RR |
3025 | out_free_0a: |
3026 | free_cpumask_var(cpus_hardware_enabled); | |
d2308784 | 3027 | out_free_0: |
f8c16bba | 3028 | kvm_arch_exit(); |
d2308784 | 3029 | out_fail: |
6aa8b732 AK |
3030 | return r; |
3031 | } | |
cb498ea2 | 3032 | EXPORT_SYMBOL_GPL(kvm_init); |
6aa8b732 | 3033 | |
cb498ea2 | 3034 | void kvm_exit(void) |
6aa8b732 | 3035 | { |
0ea4ed8e | 3036 | kvm_exit_debug(); |
6aa8b732 | 3037 | misc_deregister(&kvm_dev); |
c16f862d | 3038 | kmem_cache_destroy(kvm_vcpu_cache); |
af585b92 | 3039 | kvm_async_pf_deinit(); |
fb3600cc | 3040 | unregister_syscore_ops(&kvm_syscore_ops); |
6aa8b732 | 3041 | unregister_reboot_notifier(&kvm_reboot_notifier); |
59ae6c6b | 3042 | unregister_cpu_notifier(&kvm_cpu_notifier); |
75b7127c | 3043 | on_each_cpu(hardware_disable_nolock, NULL, 1); |
e9b11c17 | 3044 | kvm_arch_hardware_unsetup(); |
f8c16bba | 3045 | kvm_arch_exit(); |
7f59f492 | 3046 | free_cpumask_var(cpus_hardware_enabled); |
6aa8b732 | 3047 | } |
cb498ea2 | 3048 | EXPORT_SYMBOL_GPL(kvm_exit); |