Commit | Line | Data |
---|---|---|
6aa8b732 AK |
1 | /* |
2 | * Kernel-based Virtual Machine driver for Linux | |
3 | * | |
4 | * This module enables machines with Intel VT-x extensions to run virtual | |
5 | * machines without emulation or binary translation. | |
6 | * | |
7 | * Copyright (C) 2006 Qumranet, Inc. | |
9611c187 | 8 | * Copyright 2010 Red Hat, Inc. and/or its affiliates. |
6aa8b732 AK |
9 | * |
10 | * Authors: | |
11 | * Avi Kivity <avi@qumranet.com> | |
12 | * Yaniv Kamay <yaniv@qumranet.com> | |
13 | * | |
14 | * This work is licensed under the terms of the GNU GPL, version 2. See | |
15 | * the COPYING file in the top-level directory. | |
16 | * | |
17 | */ | |
18 | ||
e2174021 | 19 | #include "iodev.h" |
6aa8b732 | 20 | |
edf88417 | 21 | #include <linux/kvm_host.h> |
6aa8b732 AK |
22 | #include <linux/kvm.h> |
23 | #include <linux/module.h> | |
24 | #include <linux/errno.h> | |
6aa8b732 | 25 | #include <linux/percpu.h> |
6aa8b732 AK |
26 | #include <linux/mm.h> |
27 | #include <linux/miscdevice.h> | |
28 | #include <linux/vmalloc.h> | |
6aa8b732 | 29 | #include <linux/reboot.h> |
6aa8b732 AK |
30 | #include <linux/debugfs.h> |
31 | #include <linux/highmem.h> | |
32 | #include <linux/file.h> | |
fb3600cc | 33 | #include <linux/syscore_ops.h> |
774c47f1 | 34 | #include <linux/cpu.h> |
e8edc6e0 | 35 | #include <linux/sched.h> |
d9e368d6 AK |
36 | #include <linux/cpumask.h> |
37 | #include <linux/smp.h> | |
d6d28168 | 38 | #include <linux/anon_inodes.h> |
04d2cc77 | 39 | #include <linux/profile.h> |
7aa81cc0 | 40 | #include <linux/kvm_para.h> |
6fc138d2 | 41 | #include <linux/pagemap.h> |
8d4e1288 | 42 | #include <linux/mman.h> |
35149e21 | 43 | #include <linux/swap.h> |
e56d532f | 44 | #include <linux/bitops.h> |
547de29e | 45 | #include <linux/spinlock.h> |
6ff5894c | 46 | #include <linux/compat.h> |
bc6678a3 | 47 | #include <linux/srcu.h> |
8f0b1ab6 | 48 | #include <linux/hugetlb.h> |
5a0e3ad6 | 49 | #include <linux/slab.h> |
743eeb0b SL |
50 | #include <linux/sort.h> |
51 | #include <linux/bsearch.h> | |
6aa8b732 | 52 | |
e495606d | 53 | #include <asm/processor.h> |
e495606d | 54 | #include <asm/io.h> |
2ea75be3 | 55 | #include <asm/ioctl.h> |
e495606d | 56 | #include <asm/uaccess.h> |
3e021bf5 | 57 | #include <asm/pgtable.h> |
6aa8b732 | 58 | |
5f94c174 | 59 | #include "coalesced_mmio.h" |
af585b92 | 60 | #include "async_pf.h" |
3c3c29fd | 61 | #include "vfio.h" |
5f94c174 | 62 | |
229456fc MT |
63 | #define CREATE_TRACE_POINTS |
64 | #include <trace/events/kvm.h> | |
65 | ||
6aa8b732 AK |
66 | MODULE_AUTHOR("Qumranet"); |
67 | MODULE_LICENSE("GPL"); | |
68 | ||
fa40a821 MT |
69 | /* |
70 | * Ordering of locks: | |
71 | * | |
fae3a353 | 72 | * kvm->lock --> kvm->slots_lock --> kvm->irq_lock |
fa40a821 MT |
73 | */ |
74 | ||
2f303b74 | 75 | DEFINE_SPINLOCK(kvm_lock); |
4a937f96 | 76 | static DEFINE_RAW_SPINLOCK(kvm_count_lock); |
e9b11c17 | 77 | LIST_HEAD(vm_list); |
133de902 | 78 | |
7f59f492 | 79 | static cpumask_var_t cpus_hardware_enabled; |
10474ae8 AG |
80 | static int kvm_usage_count = 0; |
81 | static atomic_t hardware_enable_failed; | |
1b6c0168 | 82 | |
c16f862d RR |
83 | struct kmem_cache *kvm_vcpu_cache; |
84 | EXPORT_SYMBOL_GPL(kvm_vcpu_cache); | |
1165f5fe | 85 | |
15ad7146 AK |
86 | static __read_mostly struct preempt_ops kvm_preempt_ops; |
87 | ||
76f7c879 | 88 | struct dentry *kvm_debugfs_dir; |
6aa8b732 | 89 | |
bccf2150 AK |
90 | static long kvm_vcpu_ioctl(struct file *file, unsigned int ioctl, |
91 | unsigned long arg); | |
1dda606c AG |
92 | #ifdef CONFIG_COMPAT |
93 | static long kvm_vcpu_compat_ioctl(struct file *file, unsigned int ioctl, | |
94 | unsigned long arg); | |
95 | #endif | |
10474ae8 AG |
96 | static int hardware_enable_all(void); |
97 | static void hardware_disable_all(void); | |
bccf2150 | 98 | |
e93f8a0f | 99 | static void kvm_io_bus_destroy(struct kvm_io_bus *bus); |
7940876e SH |
100 | |
101 | static void kvm_release_pfn_dirty(pfn_t pfn); | |
102 | static void mark_page_dirty_in_slot(struct kvm *kvm, | |
103 | struct kvm_memory_slot *memslot, gfn_t gfn); | |
e93f8a0f | 104 | |
52480137 | 105 | __visible bool kvm_rebooting; |
b7c4145b | 106 | EXPORT_SYMBOL_GPL(kvm_rebooting); |
4ecac3fd | 107 | |
54dee993 MT |
108 | static bool largepages_enabled = true; |
109 | ||
bf4bea8e | 110 | bool kvm_is_reserved_pfn(pfn_t pfn) |
cbff90a7 | 111 | { |
11feeb49 | 112 | if (pfn_valid(pfn)) |
bf4bea8e | 113 | return PageReserved(pfn_to_page(pfn)); |
cbff90a7 BAY |
114 | |
115 | return true; | |
116 | } | |
117 | ||
bccf2150 AK |
118 | /* |
119 | * Switches to specified vcpu, until a matching vcpu_put() | |
120 | */ | |
9fc77441 | 121 | int vcpu_load(struct kvm_vcpu *vcpu) |
6aa8b732 | 122 | { |
15ad7146 AK |
123 | int cpu; |
124 | ||
9fc77441 MT |
125 | if (mutex_lock_killable(&vcpu->mutex)) |
126 | return -EINTR; | |
15ad7146 AK |
127 | cpu = get_cpu(); |
128 | preempt_notifier_register(&vcpu->preempt_notifier); | |
313a3dc7 | 129 | kvm_arch_vcpu_load(vcpu, cpu); |
15ad7146 | 130 | put_cpu(); |
9fc77441 | 131 | return 0; |
6aa8b732 AK |
132 | } |
133 | ||
313a3dc7 | 134 | void vcpu_put(struct kvm_vcpu *vcpu) |
6aa8b732 | 135 | { |
15ad7146 | 136 | preempt_disable(); |
313a3dc7 | 137 | kvm_arch_vcpu_put(vcpu); |
15ad7146 AK |
138 | preempt_notifier_unregister(&vcpu->preempt_notifier); |
139 | preempt_enable(); | |
6aa8b732 AK |
140 | mutex_unlock(&vcpu->mutex); |
141 | } | |
142 | ||
d9e368d6 AK |
143 | static void ack_flush(void *_completed) |
144 | { | |
d9e368d6 AK |
145 | } |
146 | ||
445b8236 | 147 | bool kvm_make_all_cpus_request(struct kvm *kvm, unsigned int req) |
d9e368d6 | 148 | { |
597a5f55 | 149 | int i, cpu, me; |
6ef7a1bc RR |
150 | cpumask_var_t cpus; |
151 | bool called = true; | |
d9e368d6 | 152 | struct kvm_vcpu *vcpu; |
d9e368d6 | 153 | |
79f55997 | 154 | zalloc_cpumask_var(&cpus, GFP_ATOMIC); |
6ef7a1bc | 155 | |
3cba4130 | 156 | me = get_cpu(); |
988a2cae | 157 | kvm_for_each_vcpu(i, vcpu, kvm) { |
3cba4130 | 158 | kvm_make_request(req, vcpu); |
d9e368d6 | 159 | cpu = vcpu->cpu; |
6b7e2d09 XG |
160 | |
161 | /* Set ->requests bit before we read ->mode */ | |
162 | smp_mb(); | |
163 | ||
164 | if (cpus != NULL && cpu != -1 && cpu != me && | |
165 | kvm_vcpu_exiting_guest_mode(vcpu) != OUTSIDE_GUEST_MODE) | |
6ef7a1bc | 166 | cpumask_set_cpu(cpu, cpus); |
49846896 | 167 | } |
6ef7a1bc RR |
168 | if (unlikely(cpus == NULL)) |
169 | smp_call_function_many(cpu_online_mask, ack_flush, NULL, 1); | |
170 | else if (!cpumask_empty(cpus)) | |
171 | smp_call_function_many(cpus, ack_flush, NULL, 1); | |
172 | else | |
173 | called = false; | |
3cba4130 | 174 | put_cpu(); |
6ef7a1bc | 175 | free_cpumask_var(cpus); |
49846896 | 176 | return called; |
d9e368d6 AK |
177 | } |
178 | ||
49846896 | 179 | void kvm_flush_remote_tlbs(struct kvm *kvm) |
2e53d63a | 180 | { |
a086f6a1 XG |
181 | long dirty_count = kvm->tlbs_dirty; |
182 | ||
183 | smp_mb(); | |
445b8236 | 184 | if (kvm_make_all_cpus_request(kvm, KVM_REQ_TLB_FLUSH)) |
49846896 | 185 | ++kvm->stat.remote_tlb_flush; |
a086f6a1 | 186 | cmpxchg(&kvm->tlbs_dirty, dirty_count, 0); |
2e53d63a | 187 | } |
2ba9f0d8 | 188 | EXPORT_SYMBOL_GPL(kvm_flush_remote_tlbs); |
2e53d63a | 189 | |
49846896 RR |
190 | void kvm_reload_remote_mmus(struct kvm *kvm) |
191 | { | |
445b8236 | 192 | kvm_make_all_cpus_request(kvm, KVM_REQ_MMU_RELOAD); |
49846896 | 193 | } |
2e53d63a | 194 | |
d828199e MT |
195 | void kvm_make_mclock_inprogress_request(struct kvm *kvm) |
196 | { | |
445b8236 | 197 | kvm_make_all_cpus_request(kvm, KVM_REQ_MCLOCK_INPROGRESS); |
d828199e MT |
198 | } |
199 | ||
3d81bc7e | 200 | void kvm_make_scan_ioapic_request(struct kvm *kvm) |
c7c9c56c | 201 | { |
445b8236 | 202 | kvm_make_all_cpus_request(kvm, KVM_REQ_SCAN_IOAPIC); |
c7c9c56c YZ |
203 | } |
204 | ||
fb3f0f51 RR |
205 | int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id) |
206 | { | |
207 | struct page *page; | |
208 | int r; | |
209 | ||
210 | mutex_init(&vcpu->mutex); | |
211 | vcpu->cpu = -1; | |
fb3f0f51 RR |
212 | vcpu->kvm = kvm; |
213 | vcpu->vcpu_id = id; | |
34bb10b7 | 214 | vcpu->pid = NULL; |
b6958ce4 | 215 | init_waitqueue_head(&vcpu->wq); |
af585b92 | 216 | kvm_async_pf_vcpu_init(vcpu); |
fb3f0f51 RR |
217 | |
218 | page = alloc_page(GFP_KERNEL | __GFP_ZERO); | |
219 | if (!page) { | |
220 | r = -ENOMEM; | |
221 | goto fail; | |
222 | } | |
223 | vcpu->run = page_address(page); | |
224 | ||
4c088493 R |
225 | kvm_vcpu_set_in_spin_loop(vcpu, false); |
226 | kvm_vcpu_set_dy_eligible(vcpu, false); | |
3a08a8f9 | 227 | vcpu->preempted = false; |
4c088493 | 228 | |
e9b11c17 | 229 | r = kvm_arch_vcpu_init(vcpu); |
fb3f0f51 | 230 | if (r < 0) |
e9b11c17 | 231 | goto fail_free_run; |
fb3f0f51 RR |
232 | return 0; |
233 | ||
fb3f0f51 RR |
234 | fail_free_run: |
235 | free_page((unsigned long)vcpu->run); | |
236 | fail: | |
76fafa5e | 237 | return r; |
fb3f0f51 RR |
238 | } |
239 | EXPORT_SYMBOL_GPL(kvm_vcpu_init); | |
240 | ||
241 | void kvm_vcpu_uninit(struct kvm_vcpu *vcpu) | |
242 | { | |
34bb10b7 | 243 | put_pid(vcpu->pid); |
e9b11c17 | 244 | kvm_arch_vcpu_uninit(vcpu); |
fb3f0f51 RR |
245 | free_page((unsigned long)vcpu->run); |
246 | } | |
247 | EXPORT_SYMBOL_GPL(kvm_vcpu_uninit); | |
248 | ||
e930bffe AA |
249 | #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER) |
250 | static inline struct kvm *mmu_notifier_to_kvm(struct mmu_notifier *mn) | |
251 | { | |
252 | return container_of(mn, struct kvm, mmu_notifier); | |
253 | } | |
254 | ||
255 | static void kvm_mmu_notifier_invalidate_page(struct mmu_notifier *mn, | |
256 | struct mm_struct *mm, | |
257 | unsigned long address) | |
258 | { | |
259 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
bc6678a3 | 260 | int need_tlb_flush, idx; |
e930bffe AA |
261 | |
262 | /* | |
263 | * When ->invalidate_page runs, the linux pte has been zapped | |
264 | * already but the page is still allocated until | |
265 | * ->invalidate_page returns. So if we increase the sequence | |
266 | * here the kvm page fault will notice if the spte can't be | |
267 | * established because the page is going to be freed. If | |
268 | * instead the kvm page fault establishes the spte before | |
269 | * ->invalidate_page runs, kvm_unmap_hva will release it | |
270 | * before returning. | |
271 | * | |
272 | * The sequence increase only need to be seen at spin_unlock | |
273 | * time, and not at spin_lock time. | |
274 | * | |
275 | * Increasing the sequence after the spin_unlock would be | |
276 | * unsafe because the kvm page fault could then establish the | |
277 | * pte after kvm_unmap_hva returned, without noticing the page | |
278 | * is going to be freed. | |
279 | */ | |
bc6678a3 | 280 | idx = srcu_read_lock(&kvm->srcu); |
e930bffe | 281 | spin_lock(&kvm->mmu_lock); |
565f3be2 | 282 | |
e930bffe | 283 | kvm->mmu_notifier_seq++; |
a4ee1ca4 | 284 | need_tlb_flush = kvm_unmap_hva(kvm, address) | kvm->tlbs_dirty; |
e930bffe AA |
285 | /* we've to flush the tlb before the pages can be freed */ |
286 | if (need_tlb_flush) | |
287 | kvm_flush_remote_tlbs(kvm); | |
288 | ||
565f3be2 | 289 | spin_unlock(&kvm->mmu_lock); |
fe71557a TC |
290 | |
291 | kvm_arch_mmu_notifier_invalidate_page(kvm, address); | |
292 | ||
565f3be2 | 293 | srcu_read_unlock(&kvm->srcu, idx); |
e930bffe AA |
294 | } |
295 | ||
3da0dd43 IE |
296 | static void kvm_mmu_notifier_change_pte(struct mmu_notifier *mn, |
297 | struct mm_struct *mm, | |
298 | unsigned long address, | |
299 | pte_t pte) | |
300 | { | |
301 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
bc6678a3 | 302 | int idx; |
3da0dd43 | 303 | |
bc6678a3 | 304 | idx = srcu_read_lock(&kvm->srcu); |
3da0dd43 IE |
305 | spin_lock(&kvm->mmu_lock); |
306 | kvm->mmu_notifier_seq++; | |
307 | kvm_set_spte_hva(kvm, address, pte); | |
308 | spin_unlock(&kvm->mmu_lock); | |
bc6678a3 | 309 | srcu_read_unlock(&kvm->srcu, idx); |
3da0dd43 IE |
310 | } |
311 | ||
e930bffe AA |
312 | static void kvm_mmu_notifier_invalidate_range_start(struct mmu_notifier *mn, |
313 | struct mm_struct *mm, | |
314 | unsigned long start, | |
315 | unsigned long end) | |
316 | { | |
317 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
bc6678a3 | 318 | int need_tlb_flush = 0, idx; |
e930bffe | 319 | |
bc6678a3 | 320 | idx = srcu_read_lock(&kvm->srcu); |
e930bffe AA |
321 | spin_lock(&kvm->mmu_lock); |
322 | /* | |
323 | * The count increase must become visible at unlock time as no | |
324 | * spte can be established without taking the mmu_lock and | |
325 | * count is also read inside the mmu_lock critical section. | |
326 | */ | |
327 | kvm->mmu_notifier_count++; | |
b3ae2096 | 328 | need_tlb_flush = kvm_unmap_hva_range(kvm, start, end); |
a4ee1ca4 | 329 | need_tlb_flush |= kvm->tlbs_dirty; |
e930bffe AA |
330 | /* we've to flush the tlb before the pages can be freed */ |
331 | if (need_tlb_flush) | |
332 | kvm_flush_remote_tlbs(kvm); | |
565f3be2 TY |
333 | |
334 | spin_unlock(&kvm->mmu_lock); | |
335 | srcu_read_unlock(&kvm->srcu, idx); | |
e930bffe AA |
336 | } |
337 | ||
338 | static void kvm_mmu_notifier_invalidate_range_end(struct mmu_notifier *mn, | |
339 | struct mm_struct *mm, | |
340 | unsigned long start, | |
341 | unsigned long end) | |
342 | { | |
343 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
344 | ||
345 | spin_lock(&kvm->mmu_lock); | |
346 | /* | |
347 | * This sequence increase will notify the kvm page fault that | |
348 | * the page that is going to be mapped in the spte could have | |
349 | * been freed. | |
350 | */ | |
351 | kvm->mmu_notifier_seq++; | |
a355aa54 | 352 | smp_wmb(); |
e930bffe AA |
353 | /* |
354 | * The above sequence increase must be visible before the | |
a355aa54 PM |
355 | * below count decrease, which is ensured by the smp_wmb above |
356 | * in conjunction with the smp_rmb in mmu_notifier_retry(). | |
e930bffe AA |
357 | */ |
358 | kvm->mmu_notifier_count--; | |
359 | spin_unlock(&kvm->mmu_lock); | |
360 | ||
361 | BUG_ON(kvm->mmu_notifier_count < 0); | |
362 | } | |
363 | ||
364 | static int kvm_mmu_notifier_clear_flush_young(struct mmu_notifier *mn, | |
365 | struct mm_struct *mm, | |
57128468 ALC |
366 | unsigned long start, |
367 | unsigned long end) | |
e930bffe AA |
368 | { |
369 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
bc6678a3 | 370 | int young, idx; |
e930bffe | 371 | |
bc6678a3 | 372 | idx = srcu_read_lock(&kvm->srcu); |
e930bffe | 373 | spin_lock(&kvm->mmu_lock); |
e930bffe | 374 | |
57128468 | 375 | young = kvm_age_hva(kvm, start, end); |
e930bffe AA |
376 | if (young) |
377 | kvm_flush_remote_tlbs(kvm); | |
378 | ||
565f3be2 TY |
379 | spin_unlock(&kvm->mmu_lock); |
380 | srcu_read_unlock(&kvm->srcu, idx); | |
381 | ||
e930bffe AA |
382 | return young; |
383 | } | |
384 | ||
8ee53820 AA |
385 | static int kvm_mmu_notifier_test_young(struct mmu_notifier *mn, |
386 | struct mm_struct *mm, | |
387 | unsigned long address) | |
388 | { | |
389 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
390 | int young, idx; | |
391 | ||
392 | idx = srcu_read_lock(&kvm->srcu); | |
393 | spin_lock(&kvm->mmu_lock); | |
394 | young = kvm_test_age_hva(kvm, address); | |
395 | spin_unlock(&kvm->mmu_lock); | |
396 | srcu_read_unlock(&kvm->srcu, idx); | |
397 | ||
398 | return young; | |
399 | } | |
400 | ||
85db06e5 MT |
401 | static void kvm_mmu_notifier_release(struct mmu_notifier *mn, |
402 | struct mm_struct *mm) | |
403 | { | |
404 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
eda2beda LJ |
405 | int idx; |
406 | ||
407 | idx = srcu_read_lock(&kvm->srcu); | |
2df72e9b | 408 | kvm_arch_flush_shadow_all(kvm); |
eda2beda | 409 | srcu_read_unlock(&kvm->srcu, idx); |
85db06e5 MT |
410 | } |
411 | ||
e930bffe AA |
412 | static const struct mmu_notifier_ops kvm_mmu_notifier_ops = { |
413 | .invalidate_page = kvm_mmu_notifier_invalidate_page, | |
414 | .invalidate_range_start = kvm_mmu_notifier_invalidate_range_start, | |
415 | .invalidate_range_end = kvm_mmu_notifier_invalidate_range_end, | |
416 | .clear_flush_young = kvm_mmu_notifier_clear_flush_young, | |
8ee53820 | 417 | .test_young = kvm_mmu_notifier_test_young, |
3da0dd43 | 418 | .change_pte = kvm_mmu_notifier_change_pte, |
85db06e5 | 419 | .release = kvm_mmu_notifier_release, |
e930bffe | 420 | }; |
4c07b0a4 AK |
421 | |
422 | static int kvm_init_mmu_notifier(struct kvm *kvm) | |
423 | { | |
424 | kvm->mmu_notifier.ops = &kvm_mmu_notifier_ops; | |
425 | return mmu_notifier_register(&kvm->mmu_notifier, current->mm); | |
426 | } | |
427 | ||
428 | #else /* !(CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER) */ | |
429 | ||
430 | static int kvm_init_mmu_notifier(struct kvm *kvm) | |
431 | { | |
432 | return 0; | |
433 | } | |
434 | ||
e930bffe AA |
435 | #endif /* CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER */ |
436 | ||
bf3e05bc XG |
437 | static void kvm_init_memslots_id(struct kvm *kvm) |
438 | { | |
439 | int i; | |
440 | struct kvm_memslots *slots = kvm->memslots; | |
441 | ||
442 | for (i = 0; i < KVM_MEM_SLOTS_NUM; i++) | |
f85e2cb5 | 443 | slots->id_to_index[i] = slots->memslots[i].id = i; |
bf3e05bc XG |
444 | } |
445 | ||
e08b9637 | 446 | static struct kvm *kvm_create_vm(unsigned long type) |
6aa8b732 | 447 | { |
d89f5eff JK |
448 | int r, i; |
449 | struct kvm *kvm = kvm_arch_alloc_vm(); | |
6aa8b732 | 450 | |
d89f5eff JK |
451 | if (!kvm) |
452 | return ERR_PTR(-ENOMEM); | |
453 | ||
e08b9637 | 454 | r = kvm_arch_init_vm(kvm, type); |
d89f5eff | 455 | if (r) |
719d93cd | 456 | goto out_err_no_disable; |
10474ae8 AG |
457 | |
458 | r = hardware_enable_all(); | |
459 | if (r) | |
719d93cd | 460 | goto out_err_no_disable; |
10474ae8 | 461 | |
c77dcacb | 462 | #ifdef CONFIG_HAVE_KVM_IRQFD |
136bdfee | 463 | INIT_HLIST_HEAD(&kvm->irq_ack_notifier_list); |
75858a84 | 464 | #endif |
6aa8b732 | 465 | |
1e702d9a AW |
466 | BUILD_BUG_ON(KVM_MEM_SLOTS_NUM > SHRT_MAX); |
467 | ||
46a26bf5 MT |
468 | r = -ENOMEM; |
469 | kvm->memslots = kzalloc(sizeof(struct kvm_memslots), GFP_KERNEL); | |
470 | if (!kvm->memslots) | |
719d93cd | 471 | goto out_err_no_srcu; |
00f034a1 PB |
472 | |
473 | /* | |
474 | * Init kvm generation close to the maximum to easily test the | |
475 | * code of handling generation number wrap-around. | |
476 | */ | |
477 | kvm->memslots->generation = -150; | |
478 | ||
bf3e05bc | 479 | kvm_init_memslots_id(kvm); |
bc6678a3 | 480 | if (init_srcu_struct(&kvm->srcu)) |
719d93cd CB |
481 | goto out_err_no_srcu; |
482 | if (init_srcu_struct(&kvm->irq_srcu)) | |
483 | goto out_err_no_irq_srcu; | |
e93f8a0f MT |
484 | for (i = 0; i < KVM_NR_BUSES; i++) { |
485 | kvm->buses[i] = kzalloc(sizeof(struct kvm_io_bus), | |
486 | GFP_KERNEL); | |
57e7fbee | 487 | if (!kvm->buses[i]) |
e93f8a0f | 488 | goto out_err; |
e93f8a0f | 489 | } |
e930bffe | 490 | |
74b5c5bf | 491 | spin_lock_init(&kvm->mmu_lock); |
6d4e4c4f AK |
492 | kvm->mm = current->mm; |
493 | atomic_inc(&kvm->mm->mm_count); | |
d34e6b17 | 494 | kvm_eventfd_init(kvm); |
11ec2804 | 495 | mutex_init(&kvm->lock); |
60eead79 | 496 | mutex_init(&kvm->irq_lock); |
79fac95e | 497 | mutex_init(&kvm->slots_lock); |
d39f13b0 | 498 | atomic_set(&kvm->users_count, 1); |
07f0a7bd | 499 | INIT_LIST_HEAD(&kvm->devices); |
74b5c5bf MW |
500 | |
501 | r = kvm_init_mmu_notifier(kvm); | |
502 | if (r) | |
503 | goto out_err; | |
504 | ||
2f303b74 | 505 | spin_lock(&kvm_lock); |
5e58cfe4 | 506 | list_add(&kvm->vm_list, &vm_list); |
2f303b74 | 507 | spin_unlock(&kvm_lock); |
d89f5eff | 508 | |
f17abe9a | 509 | return kvm; |
10474ae8 AG |
510 | |
511 | out_err: | |
719d93cd CB |
512 | cleanup_srcu_struct(&kvm->irq_srcu); |
513 | out_err_no_irq_srcu: | |
57e7fbee | 514 | cleanup_srcu_struct(&kvm->srcu); |
719d93cd | 515 | out_err_no_srcu: |
10474ae8 | 516 | hardware_disable_all(); |
719d93cd | 517 | out_err_no_disable: |
e93f8a0f MT |
518 | for (i = 0; i < KVM_NR_BUSES; i++) |
519 | kfree(kvm->buses[i]); | |
46a26bf5 | 520 | kfree(kvm->memslots); |
d89f5eff | 521 | kvm_arch_free_vm(kvm); |
10474ae8 | 522 | return ERR_PTR(r); |
f17abe9a AK |
523 | } |
524 | ||
92eca8fa TY |
525 | /* |
526 | * Avoid using vmalloc for a small buffer. | |
527 | * Should not be used when the size is statically known. | |
528 | */ | |
c1a7b32a | 529 | void *kvm_kvzalloc(unsigned long size) |
92eca8fa TY |
530 | { |
531 | if (size > PAGE_SIZE) | |
532 | return vzalloc(size); | |
533 | else | |
534 | return kzalloc(size, GFP_KERNEL); | |
535 | } | |
536 | ||
c1a7b32a | 537 | void kvm_kvfree(const void *addr) |
92eca8fa TY |
538 | { |
539 | if (is_vmalloc_addr(addr)) | |
540 | vfree(addr); | |
541 | else | |
542 | kfree(addr); | |
543 | } | |
544 | ||
a36a57b1 TY |
545 | static void kvm_destroy_dirty_bitmap(struct kvm_memory_slot *memslot) |
546 | { | |
547 | if (!memslot->dirty_bitmap) | |
548 | return; | |
549 | ||
92eca8fa | 550 | kvm_kvfree(memslot->dirty_bitmap); |
a36a57b1 TY |
551 | memslot->dirty_bitmap = NULL; |
552 | } | |
553 | ||
6aa8b732 AK |
554 | /* |
555 | * Free any memory in @free but not in @dont. | |
556 | */ | |
5587027c | 557 | static void kvm_free_physmem_slot(struct kvm *kvm, struct kvm_memory_slot *free, |
6aa8b732 AK |
558 | struct kvm_memory_slot *dont) |
559 | { | |
6aa8b732 | 560 | if (!dont || free->dirty_bitmap != dont->dirty_bitmap) |
a36a57b1 | 561 | kvm_destroy_dirty_bitmap(free); |
6aa8b732 | 562 | |
5587027c | 563 | kvm_arch_free_memslot(kvm, free, dont); |
05da4558 | 564 | |
6aa8b732 | 565 | free->npages = 0; |
6aa8b732 AK |
566 | } |
567 | ||
7940876e | 568 | static void kvm_free_physmem(struct kvm *kvm) |
6aa8b732 | 569 | { |
46a26bf5 | 570 | struct kvm_memslots *slots = kvm->memslots; |
be6ba0f0 | 571 | struct kvm_memory_slot *memslot; |
46a26bf5 | 572 | |
be6ba0f0 | 573 | kvm_for_each_memslot(memslot, slots) |
5587027c | 574 | kvm_free_physmem_slot(kvm, memslot, NULL); |
6aa8b732 | 575 | |
46a26bf5 | 576 | kfree(kvm->memslots); |
6aa8b732 AK |
577 | } |
578 | ||
07f0a7bd SW |
579 | static void kvm_destroy_devices(struct kvm *kvm) |
580 | { | |
581 | struct list_head *node, *tmp; | |
582 | ||
583 | list_for_each_safe(node, tmp, &kvm->devices) { | |
584 | struct kvm_device *dev = | |
585 | list_entry(node, struct kvm_device, vm_node); | |
586 | ||
587 | list_del(node); | |
588 | dev->ops->destroy(dev); | |
589 | } | |
590 | } | |
591 | ||
f17abe9a AK |
592 | static void kvm_destroy_vm(struct kvm *kvm) |
593 | { | |
e93f8a0f | 594 | int i; |
6d4e4c4f AK |
595 | struct mm_struct *mm = kvm->mm; |
596 | ||
ad8ba2cd | 597 | kvm_arch_sync_events(kvm); |
2f303b74 | 598 | spin_lock(&kvm_lock); |
133de902 | 599 | list_del(&kvm->vm_list); |
2f303b74 | 600 | spin_unlock(&kvm_lock); |
399ec807 | 601 | kvm_free_irq_routing(kvm); |
e93f8a0f MT |
602 | for (i = 0; i < KVM_NR_BUSES; i++) |
603 | kvm_io_bus_destroy(kvm->buses[i]); | |
980da6ce | 604 | kvm_coalesced_mmio_free(kvm); |
e930bffe AA |
605 | #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER) |
606 | mmu_notifier_unregister(&kvm->mmu_notifier, kvm->mm); | |
f00be0ca | 607 | #else |
2df72e9b | 608 | kvm_arch_flush_shadow_all(kvm); |
5f94c174 | 609 | #endif |
d19a9cd2 | 610 | kvm_arch_destroy_vm(kvm); |
07f0a7bd | 611 | kvm_destroy_devices(kvm); |
d89f5eff | 612 | kvm_free_physmem(kvm); |
820b3fcd | 613 | cleanup_srcu_struct(&kvm->irq_srcu); |
d89f5eff JK |
614 | cleanup_srcu_struct(&kvm->srcu); |
615 | kvm_arch_free_vm(kvm); | |
10474ae8 | 616 | hardware_disable_all(); |
6d4e4c4f | 617 | mmdrop(mm); |
f17abe9a AK |
618 | } |
619 | ||
d39f13b0 IE |
620 | void kvm_get_kvm(struct kvm *kvm) |
621 | { | |
622 | atomic_inc(&kvm->users_count); | |
623 | } | |
624 | EXPORT_SYMBOL_GPL(kvm_get_kvm); | |
625 | ||
626 | void kvm_put_kvm(struct kvm *kvm) | |
627 | { | |
628 | if (atomic_dec_and_test(&kvm->users_count)) | |
629 | kvm_destroy_vm(kvm); | |
630 | } | |
631 | EXPORT_SYMBOL_GPL(kvm_put_kvm); | |
632 | ||
633 | ||
f17abe9a AK |
634 | static int kvm_vm_release(struct inode *inode, struct file *filp) |
635 | { | |
636 | struct kvm *kvm = filp->private_data; | |
637 | ||
721eecbf GH |
638 | kvm_irqfd_release(kvm); |
639 | ||
d39f13b0 | 640 | kvm_put_kvm(kvm); |
6aa8b732 AK |
641 | return 0; |
642 | } | |
643 | ||
515a0127 TY |
644 | /* |
645 | * Allocation size is twice as large as the actual dirty bitmap size. | |
93474b25 | 646 | * See x86's kvm_vm_ioctl_get_dirty_log() why this is needed. |
515a0127 | 647 | */ |
a36a57b1 TY |
648 | static int kvm_create_dirty_bitmap(struct kvm_memory_slot *memslot) |
649 | { | |
515a0127 | 650 | unsigned long dirty_bytes = 2 * kvm_dirty_bitmap_bytes(memslot); |
a36a57b1 | 651 | |
92eca8fa | 652 | memslot->dirty_bitmap = kvm_kvzalloc(dirty_bytes); |
a36a57b1 TY |
653 | if (!memslot->dirty_bitmap) |
654 | return -ENOMEM; | |
655 | ||
a36a57b1 TY |
656 | return 0; |
657 | } | |
658 | ||
bf3e05bc | 659 | /* |
0e60b079 IM |
660 | * Insert memslot and re-sort memslots based on their GFN, |
661 | * so binary search could be used to lookup GFN. | |
662 | * Sorting algorithm takes advantage of having initially | |
663 | * sorted array and known changed memslot position. | |
bf3e05bc | 664 | */ |
5cc15027 PB |
665 | static void update_memslots(struct kvm_memslots *slots, |
666 | struct kvm_memory_slot *new) | |
bf3e05bc | 667 | { |
8593176c PB |
668 | int id = new->id; |
669 | int i = slots->id_to_index[id]; | |
063584d4 | 670 | struct kvm_memory_slot *mslots = slots->memslots; |
f85e2cb5 | 671 | |
8593176c | 672 | WARN_ON(mslots[i].id != id); |
9c1a5d38 | 673 | if (!new->npages) { |
dbaff309 | 674 | WARN_ON(!mslots[i].npages); |
0e60b079 | 675 | new->base_gfn = 0; |
9c1a5d38 IM |
676 | if (mslots[i].npages) |
677 | slots->used_slots--; | |
678 | } else { | |
679 | if (!mslots[i].npages) | |
680 | slots->used_slots++; | |
681 | } | |
0e60b079 | 682 | |
7f379cff | 683 | while (i < KVM_MEM_SLOTS_NUM - 1 && |
0e60b079 IM |
684 | new->base_gfn <= mslots[i + 1].base_gfn) { |
685 | if (!mslots[i + 1].npages) | |
686 | break; | |
7f379cff IM |
687 | mslots[i] = mslots[i + 1]; |
688 | slots->id_to_index[mslots[i].id] = i; | |
689 | i++; | |
690 | } | |
efbeec70 PB |
691 | |
692 | /* | |
693 | * The ">=" is needed when creating a slot with base_gfn == 0, | |
694 | * so that it moves before all those with base_gfn == npages == 0. | |
695 | * | |
696 | * On the other hand, if new->npages is zero, the above loop has | |
697 | * already left i pointing to the beginning of the empty part of | |
698 | * mslots, and the ">=" would move the hole backwards in this | |
699 | * case---which is wrong. So skip the loop when deleting a slot. | |
700 | */ | |
701 | if (new->npages) { | |
702 | while (i > 0 && | |
703 | new->base_gfn >= mslots[i - 1].base_gfn) { | |
704 | mslots[i] = mslots[i - 1]; | |
705 | slots->id_to_index[mslots[i].id] = i; | |
706 | i--; | |
707 | } | |
dbaff309 PB |
708 | } else |
709 | WARN_ON_ONCE(i != slots->used_slots); | |
f85e2cb5 | 710 | |
8593176c PB |
711 | mslots[i] = *new; |
712 | slots->id_to_index[mslots[i].id] = i; | |
bf3e05bc XG |
713 | } |
714 | ||
a50d64d6 XG |
715 | static int check_memory_region_flags(struct kvm_userspace_memory_region *mem) |
716 | { | |
4d8b81ab XG |
717 | u32 valid_flags = KVM_MEM_LOG_DIRTY_PAGES; |
718 | ||
0f8a4de3 | 719 | #ifdef __KVM_HAVE_READONLY_MEM |
4d8b81ab XG |
720 | valid_flags |= KVM_MEM_READONLY; |
721 | #endif | |
722 | ||
723 | if (mem->flags & ~valid_flags) | |
a50d64d6 XG |
724 | return -EINVAL; |
725 | ||
726 | return 0; | |
727 | } | |
728 | ||
7ec4fb44 | 729 | static struct kvm_memslots *install_new_memslots(struct kvm *kvm, |
5cc15027 | 730 | struct kvm_memslots *slots) |
7ec4fb44 GN |
731 | { |
732 | struct kvm_memslots *old_memslots = kvm->memslots; | |
733 | ||
ee3d1570 DM |
734 | /* |
735 | * Set the low bit in the generation, which disables SPTE caching | |
736 | * until the end of synchronize_srcu_expedited. | |
737 | */ | |
738 | WARN_ON(old_memslots->generation & 1); | |
739 | slots->generation = old_memslots->generation + 1; | |
740 | ||
7ec4fb44 GN |
741 | rcu_assign_pointer(kvm->memslots, slots); |
742 | synchronize_srcu_expedited(&kvm->srcu); | |
e59dbe09 | 743 | |
ee3d1570 DM |
744 | /* |
745 | * Increment the new memslot generation a second time. This prevents | |
746 | * vm exits that race with memslot updates from caching a memslot | |
747 | * generation that will (potentially) be valid forever. | |
748 | */ | |
749 | slots->generation++; | |
750 | ||
e59dbe09 TY |
751 | kvm_arch_memslots_updated(kvm); |
752 | ||
753 | return old_memslots; | |
7ec4fb44 GN |
754 | } |
755 | ||
6aa8b732 AK |
756 | /* |
757 | * Allocate some memory and give it an address in the guest physical address | |
758 | * space. | |
759 | * | |
760 | * Discontiguous memory is allowed, mostly for framebuffers. | |
f78e0e2e | 761 | * |
02d5d55b | 762 | * Must be called holding kvm->slots_lock for write. |
6aa8b732 | 763 | */ |
f78e0e2e | 764 | int __kvm_set_memory_region(struct kvm *kvm, |
47ae31e2 | 765 | struct kvm_userspace_memory_region *mem) |
6aa8b732 | 766 | { |
8234b22e | 767 | int r; |
6aa8b732 | 768 | gfn_t base_gfn; |
28bcb112 | 769 | unsigned long npages; |
a843fac2 | 770 | struct kvm_memory_slot *slot; |
6aa8b732 | 771 | struct kvm_memory_slot old, new; |
b7f69c55 | 772 | struct kvm_memslots *slots = NULL, *old_memslots; |
f64c0398 | 773 | enum kvm_mr_change change; |
6aa8b732 | 774 | |
a50d64d6 XG |
775 | r = check_memory_region_flags(mem); |
776 | if (r) | |
777 | goto out; | |
778 | ||
6aa8b732 AK |
779 | r = -EINVAL; |
780 | /* General sanity checks */ | |
781 | if (mem->memory_size & (PAGE_SIZE - 1)) | |
782 | goto out; | |
783 | if (mem->guest_phys_addr & (PAGE_SIZE - 1)) | |
784 | goto out; | |
fa3d315a | 785 | /* We can read the guest memory with __xxx_user() later on. */ |
47ae31e2 | 786 | if ((mem->slot < KVM_USER_MEM_SLOTS) && |
fa3d315a | 787 | ((mem->userspace_addr & (PAGE_SIZE - 1)) || |
9e3bb6b6 HC |
788 | !access_ok(VERIFY_WRITE, |
789 | (void __user *)(unsigned long)mem->userspace_addr, | |
790 | mem->memory_size))) | |
78749809 | 791 | goto out; |
93a5cef0 | 792 | if (mem->slot >= KVM_MEM_SLOTS_NUM) |
6aa8b732 AK |
793 | goto out; |
794 | if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr) | |
795 | goto out; | |
796 | ||
a843fac2 | 797 | slot = id_to_memslot(kvm->memslots, mem->slot); |
6aa8b732 AK |
798 | base_gfn = mem->guest_phys_addr >> PAGE_SHIFT; |
799 | npages = mem->memory_size >> PAGE_SHIFT; | |
800 | ||
660c22c4 TY |
801 | if (npages > KVM_MEM_MAX_NR_PAGES) |
802 | goto out; | |
803 | ||
6aa8b732 AK |
804 | if (!npages) |
805 | mem->flags &= ~KVM_MEM_LOG_DIRTY_PAGES; | |
806 | ||
a843fac2 | 807 | new = old = *slot; |
6aa8b732 | 808 | |
e36d96f7 | 809 | new.id = mem->slot; |
6aa8b732 AK |
810 | new.base_gfn = base_gfn; |
811 | new.npages = npages; | |
812 | new.flags = mem->flags; | |
813 | ||
f64c0398 TY |
814 | if (npages) { |
815 | if (!old.npages) | |
816 | change = KVM_MR_CREATE; | |
817 | else { /* Modify an existing slot. */ | |
818 | if ((mem->userspace_addr != old.userspace_addr) || | |
75d61fbc TY |
819 | (npages != old.npages) || |
820 | ((new.flags ^ old.flags) & KVM_MEM_READONLY)) | |
f64c0398 TY |
821 | goto out; |
822 | ||
823 | if (base_gfn != old.base_gfn) | |
824 | change = KVM_MR_MOVE; | |
825 | else if (new.flags != old.flags) | |
826 | change = KVM_MR_FLAGS_ONLY; | |
827 | else { /* Nothing to change. */ | |
828 | r = 0; | |
829 | goto out; | |
830 | } | |
831 | } | |
832 | } else if (old.npages) { | |
833 | change = KVM_MR_DELETE; | |
834 | } else /* Modify a non-existent slot: disallowed. */ | |
0ea75e1d | 835 | goto out; |
6aa8b732 | 836 | |
f64c0398 | 837 | if ((change == KVM_MR_CREATE) || (change == KVM_MR_MOVE)) { |
0a706bee TY |
838 | /* Check for overlaps */ |
839 | r = -EEXIST; | |
840 | kvm_for_each_memslot(slot, kvm->memslots) { | |
a843fac2 TY |
841 | if ((slot->id >= KVM_USER_MEM_SLOTS) || |
842 | (slot->id == mem->slot)) | |
0a706bee TY |
843 | continue; |
844 | if (!((base_gfn + npages <= slot->base_gfn) || | |
845 | (base_gfn >= slot->base_gfn + slot->npages))) | |
846 | goto out; | |
847 | } | |
6aa8b732 | 848 | } |
6aa8b732 | 849 | |
6aa8b732 AK |
850 | /* Free page dirty bitmap if unneeded */ |
851 | if (!(new.flags & KVM_MEM_LOG_DIRTY_PAGES)) | |
8b6d44c7 | 852 | new.dirty_bitmap = NULL; |
6aa8b732 AK |
853 | |
854 | r = -ENOMEM; | |
f64c0398 | 855 | if (change == KVM_MR_CREATE) { |
189a2f7b | 856 | new.userspace_addr = mem->userspace_addr; |
d89cc617 | 857 | |
5587027c | 858 | if (kvm_arch_create_memslot(kvm, &new, npages)) |
db3fe4eb | 859 | goto out_free; |
6aa8b732 | 860 | } |
ec04b260 | 861 | |
6aa8b732 AK |
862 | /* Allocate page dirty bitmap if needed */ |
863 | if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) { | |
a36a57b1 | 864 | if (kvm_create_dirty_bitmap(&new) < 0) |
f78e0e2e | 865 | goto out_free; |
6aa8b732 AK |
866 | } |
867 | ||
f2a81036 PB |
868 | slots = kmemdup(kvm->memslots, sizeof(struct kvm_memslots), |
869 | GFP_KERNEL); | |
870 | if (!slots) | |
871 | goto out_free; | |
872 | ||
f64c0398 | 873 | if ((change == KVM_MR_DELETE) || (change == KVM_MR_MOVE)) { |
28a37544 XG |
874 | slot = id_to_memslot(slots, mem->slot); |
875 | slot->flags |= KVM_MEMSLOT_INVALID; | |
876 | ||
5cc15027 | 877 | old_memslots = install_new_memslots(kvm, slots); |
bc6678a3 | 878 | |
e40f193f AW |
879 | /* slot was deleted or moved, clear iommu mapping */ |
880 | kvm_iommu_unmap_pages(kvm, &old); | |
12d6e753 MT |
881 | /* From this point no new shadow pages pointing to a deleted, |
882 | * or moved, memslot will be created. | |
bc6678a3 MT |
883 | * |
884 | * validation of sp->gfn happens in: | |
885 | * - gfn_to_hva (kvm_read_guest, gfn_to_pfn) | |
886 | * - kvm_is_visible_gfn (mmu_check_roots) | |
887 | */ | |
2df72e9b | 888 | kvm_arch_flush_shadow_memslot(kvm, slot); |
f2a81036 PB |
889 | |
890 | /* | |
891 | * We can re-use the old_memslots from above, the only difference | |
892 | * from the currently installed memslots is the invalid flag. This | |
893 | * will get overwritten by update_memslots anyway. | |
894 | */ | |
b7f69c55 | 895 | slots = old_memslots; |
bc6678a3 | 896 | } |
34d4cb8f | 897 | |
7b6195a9 | 898 | r = kvm_arch_prepare_memory_region(kvm, &new, mem, change); |
f7784b8e | 899 | if (r) |
b7f69c55 | 900 | goto out_slots; |
f7784b8e | 901 | |
bc6678a3 | 902 | /* actual memory is freed via old in kvm_free_physmem_slot below */ |
f64c0398 | 903 | if (change == KVM_MR_DELETE) { |
bc6678a3 | 904 | new.dirty_bitmap = NULL; |
db3fe4eb | 905 | memset(&new.arch, 0, sizeof(new.arch)); |
bc6678a3 MT |
906 | } |
907 | ||
5cc15027 PB |
908 | update_memslots(slots, &new); |
909 | old_memslots = install_new_memslots(kvm, slots); | |
3ad82a7e | 910 | |
8482644a | 911 | kvm_arch_commit_memory_region(kvm, mem, &old, change); |
82ce2c96 | 912 | |
5587027c | 913 | kvm_free_physmem_slot(kvm, &old, &new); |
bc6678a3 MT |
914 | kfree(old_memslots); |
915 | ||
261874b0 AW |
916 | /* |
917 | * IOMMU mapping: New slots need to be mapped. Old slots need to be | |
75d61fbc TY |
918 | * un-mapped and re-mapped if their base changes. Since base change |
919 | * unmapping is handled above with slot deletion, mapping alone is | |
920 | * needed here. Anything else the iommu might care about for existing | |
921 | * slots (size changes, userspace addr changes and read-only flag | |
922 | * changes) is disallowed above, so any other attribute changes getting | |
923 | * here can be skipped. | |
261874b0 | 924 | */ |
75d61fbc TY |
925 | if ((change == KVM_MR_CREATE) || (change == KVM_MR_MOVE)) { |
926 | r = kvm_iommu_map_pages(kvm, &new); | |
e0230e13 | 927 | return r; |
bc6678a3 MT |
928 | } |
929 | ||
6aa8b732 AK |
930 | return 0; |
931 | ||
e40f193f AW |
932 | out_slots: |
933 | kfree(slots); | |
f78e0e2e | 934 | out_free: |
5587027c | 935 | kvm_free_physmem_slot(kvm, &new, &old); |
6aa8b732 AK |
936 | out: |
937 | return r; | |
210c7c4d | 938 | } |
f78e0e2e SY |
939 | EXPORT_SYMBOL_GPL(__kvm_set_memory_region); |
940 | ||
941 | int kvm_set_memory_region(struct kvm *kvm, | |
47ae31e2 | 942 | struct kvm_userspace_memory_region *mem) |
f78e0e2e SY |
943 | { |
944 | int r; | |
945 | ||
79fac95e | 946 | mutex_lock(&kvm->slots_lock); |
47ae31e2 | 947 | r = __kvm_set_memory_region(kvm, mem); |
79fac95e | 948 | mutex_unlock(&kvm->slots_lock); |
f78e0e2e SY |
949 | return r; |
950 | } | |
210c7c4d IE |
951 | EXPORT_SYMBOL_GPL(kvm_set_memory_region); |
952 | ||
7940876e SH |
953 | static int kvm_vm_ioctl_set_memory_region(struct kvm *kvm, |
954 | struct kvm_userspace_memory_region *mem) | |
210c7c4d | 955 | { |
bbacc0c1 | 956 | if (mem->slot >= KVM_USER_MEM_SLOTS) |
e0d62c7f | 957 | return -EINVAL; |
47ae31e2 | 958 | return kvm_set_memory_region(kvm, mem); |
6aa8b732 AK |
959 | } |
960 | ||
5bb064dc ZX |
961 | int kvm_get_dirty_log(struct kvm *kvm, |
962 | struct kvm_dirty_log *log, int *is_dirty) | |
6aa8b732 AK |
963 | { |
964 | struct kvm_memory_slot *memslot; | |
965 | int r, i; | |
87bf6e7d | 966 | unsigned long n; |
6aa8b732 AK |
967 | unsigned long any = 0; |
968 | ||
6aa8b732 | 969 | r = -EINVAL; |
bbacc0c1 | 970 | if (log->slot >= KVM_USER_MEM_SLOTS) |
6aa8b732 AK |
971 | goto out; |
972 | ||
28a37544 | 973 | memslot = id_to_memslot(kvm->memslots, log->slot); |
6aa8b732 AK |
974 | r = -ENOENT; |
975 | if (!memslot->dirty_bitmap) | |
976 | goto out; | |
977 | ||
87bf6e7d | 978 | n = kvm_dirty_bitmap_bytes(memslot); |
6aa8b732 | 979 | |
cd1a4a98 | 980 | for (i = 0; !any && i < n/sizeof(long); ++i) |
6aa8b732 AK |
981 | any = memslot->dirty_bitmap[i]; |
982 | ||
983 | r = -EFAULT; | |
984 | if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n)) | |
985 | goto out; | |
986 | ||
5bb064dc ZX |
987 | if (any) |
988 | *is_dirty = 1; | |
6aa8b732 AK |
989 | |
990 | r = 0; | |
6aa8b732 | 991 | out: |
6aa8b732 AK |
992 | return r; |
993 | } | |
2ba9f0d8 | 994 | EXPORT_SYMBOL_GPL(kvm_get_dirty_log); |
6aa8b732 | 995 | |
db3fe4eb TY |
996 | bool kvm_largepages_enabled(void) |
997 | { | |
998 | return largepages_enabled; | |
999 | } | |
1000 | ||
54dee993 MT |
1001 | void kvm_disable_largepages(void) |
1002 | { | |
1003 | largepages_enabled = false; | |
1004 | } | |
1005 | EXPORT_SYMBOL_GPL(kvm_disable_largepages); | |
1006 | ||
49c7754c GN |
1007 | struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn) |
1008 | { | |
1009 | return __gfn_to_memslot(kvm_memslots(kvm), gfn); | |
1010 | } | |
a1f4d395 | 1011 | EXPORT_SYMBOL_GPL(gfn_to_memslot); |
6aa8b732 | 1012 | |
e0d62c7f IE |
1013 | int kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn) |
1014 | { | |
bf3e05bc | 1015 | struct kvm_memory_slot *memslot = gfn_to_memslot(kvm, gfn); |
e0d62c7f | 1016 | |
bbacc0c1 | 1017 | if (!memslot || memslot->id >= KVM_USER_MEM_SLOTS || |
bf3e05bc XG |
1018 | memslot->flags & KVM_MEMSLOT_INVALID) |
1019 | return 0; | |
e0d62c7f | 1020 | |
bf3e05bc | 1021 | return 1; |
e0d62c7f IE |
1022 | } |
1023 | EXPORT_SYMBOL_GPL(kvm_is_visible_gfn); | |
1024 | ||
8f0b1ab6 JR |
1025 | unsigned long kvm_host_page_size(struct kvm *kvm, gfn_t gfn) |
1026 | { | |
1027 | struct vm_area_struct *vma; | |
1028 | unsigned long addr, size; | |
1029 | ||
1030 | size = PAGE_SIZE; | |
1031 | ||
1032 | addr = gfn_to_hva(kvm, gfn); | |
1033 | if (kvm_is_error_hva(addr)) | |
1034 | return PAGE_SIZE; | |
1035 | ||
1036 | down_read(¤t->mm->mmap_sem); | |
1037 | vma = find_vma(current->mm, addr); | |
1038 | if (!vma) | |
1039 | goto out; | |
1040 | ||
1041 | size = vma_kernel_pagesize(vma); | |
1042 | ||
1043 | out: | |
1044 | up_read(¤t->mm->mmap_sem); | |
1045 | ||
1046 | return size; | |
1047 | } | |
1048 | ||
4d8b81ab XG |
1049 | static bool memslot_is_readonly(struct kvm_memory_slot *slot) |
1050 | { | |
1051 | return slot->flags & KVM_MEM_READONLY; | |
1052 | } | |
1053 | ||
4d8b81ab XG |
1054 | static unsigned long __gfn_to_hva_many(struct kvm_memory_slot *slot, gfn_t gfn, |
1055 | gfn_t *nr_pages, bool write) | |
539cb660 | 1056 | { |
bc6678a3 | 1057 | if (!slot || slot->flags & KVM_MEMSLOT_INVALID) |
ca3a490c | 1058 | return KVM_HVA_ERR_BAD; |
48987781 | 1059 | |
4d8b81ab XG |
1060 | if (memslot_is_readonly(slot) && write) |
1061 | return KVM_HVA_ERR_RO_BAD; | |
48987781 XG |
1062 | |
1063 | if (nr_pages) | |
1064 | *nr_pages = slot->npages - (gfn - slot->base_gfn); | |
1065 | ||
4d8b81ab | 1066 | return __gfn_to_hva_memslot(slot, gfn); |
539cb660 | 1067 | } |
48987781 | 1068 | |
4d8b81ab XG |
1069 | static unsigned long gfn_to_hva_many(struct kvm_memory_slot *slot, gfn_t gfn, |
1070 | gfn_t *nr_pages) | |
1071 | { | |
1072 | return __gfn_to_hva_many(slot, gfn, nr_pages, true); | |
539cb660 | 1073 | } |
48987781 | 1074 | |
4d8b81ab | 1075 | unsigned long gfn_to_hva_memslot(struct kvm_memory_slot *slot, |
7940876e | 1076 | gfn_t gfn) |
4d8b81ab XG |
1077 | { |
1078 | return gfn_to_hva_many(slot, gfn, NULL); | |
1079 | } | |
1080 | EXPORT_SYMBOL_GPL(gfn_to_hva_memslot); | |
1081 | ||
48987781 XG |
1082 | unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn) |
1083 | { | |
49c7754c | 1084 | return gfn_to_hva_many(gfn_to_memslot(kvm, gfn), gfn, NULL); |
48987781 | 1085 | } |
0d150298 | 1086 | EXPORT_SYMBOL_GPL(gfn_to_hva); |
539cb660 | 1087 | |
86ab8cff | 1088 | /* |
ba6a3541 PB |
1089 | * If writable is set to false, the hva returned by this function is only |
1090 | * allowed to be read. | |
86ab8cff | 1091 | */ |
64d83126 CD |
1092 | unsigned long gfn_to_hva_memslot_prot(struct kvm_memory_slot *slot, |
1093 | gfn_t gfn, bool *writable) | |
86ab8cff | 1094 | { |
a2ac07fe GN |
1095 | unsigned long hva = __gfn_to_hva_many(slot, gfn, NULL, false); |
1096 | ||
1097 | if (!kvm_is_error_hva(hva) && writable) | |
ba6a3541 PB |
1098 | *writable = !memslot_is_readonly(slot); |
1099 | ||
a2ac07fe | 1100 | return hva; |
86ab8cff XG |
1101 | } |
1102 | ||
64d83126 CD |
1103 | unsigned long gfn_to_hva_prot(struct kvm *kvm, gfn_t gfn, bool *writable) |
1104 | { | |
1105 | struct kvm_memory_slot *slot = gfn_to_memslot(kvm, gfn); | |
1106 | ||
1107 | return gfn_to_hva_memslot_prot(slot, gfn, writable); | |
1108 | } | |
1109 | ||
86ab8cff | 1110 | static int kvm_read_hva(void *data, void __user *hva, int len) |
8030089f | 1111 | { |
86ab8cff XG |
1112 | return __copy_from_user(data, hva, len); |
1113 | } | |
1114 | ||
1115 | static int kvm_read_hva_atomic(void *data, void __user *hva, int len) | |
1116 | { | |
1117 | return __copy_from_user_inatomic(data, hva, len); | |
8030089f GN |
1118 | } |
1119 | ||
39369f7a | 1120 | static int get_user_page_nowait(struct task_struct *tsk, struct mm_struct *mm, |
0857b9e9 GN |
1121 | unsigned long start, int write, struct page **page) |
1122 | { | |
1123 | int flags = FOLL_TOUCH | FOLL_NOWAIT | FOLL_HWPOISON | FOLL_GET; | |
1124 | ||
1125 | if (write) | |
1126 | flags |= FOLL_WRITE; | |
1127 | ||
1128 | return __get_user_pages(tsk, mm, start, 1, flags, page, NULL, NULL); | |
1129 | } | |
1130 | ||
234b239b ALC |
1131 | int kvm_get_user_page_io(struct task_struct *tsk, struct mm_struct *mm, |
1132 | unsigned long addr, bool write_fault, | |
1133 | struct page **pagep) | |
1134 | { | |
1135 | int npages; | |
1136 | int locked = 1; | |
1137 | int flags = FOLL_TOUCH | FOLL_HWPOISON | | |
1138 | (pagep ? FOLL_GET : 0) | | |
1139 | (write_fault ? FOLL_WRITE : 0); | |
1140 | ||
1141 | /* | |
1142 | * If retrying the fault, we get here *not* having allowed the filemap | |
1143 | * to wait on the page lock. We should now allow waiting on the IO with | |
1144 | * the mmap semaphore released. | |
1145 | */ | |
1146 | down_read(&mm->mmap_sem); | |
1147 | npages = __get_user_pages(tsk, mm, addr, 1, flags, pagep, NULL, | |
1148 | &locked); | |
1149 | if (!locked) { | |
bb0ca6ac | 1150 | VM_BUG_ON(npages); |
234b239b ALC |
1151 | |
1152 | if (!pagep) | |
1153 | return 0; | |
1154 | ||
1155 | /* | |
1156 | * The previous call has now waited on the IO. Now we can | |
1157 | * retry and complete. Pass TRIED to ensure we do not re | |
1158 | * schedule async IO (see e.g. filemap_fault). | |
1159 | */ | |
1160 | down_read(&mm->mmap_sem); | |
1161 | npages = __get_user_pages(tsk, mm, addr, 1, flags | FOLL_TRIED, | |
1162 | pagep, NULL, NULL); | |
1163 | } | |
1164 | up_read(&mm->mmap_sem); | |
1165 | return npages; | |
1166 | } | |
1167 | ||
fafc3dba HY |
1168 | static inline int check_user_page_hwpoison(unsigned long addr) |
1169 | { | |
1170 | int rc, flags = FOLL_TOUCH | FOLL_HWPOISON | FOLL_WRITE; | |
1171 | ||
1172 | rc = __get_user_pages(current, current->mm, addr, 1, | |
1173 | flags, NULL, NULL, NULL); | |
1174 | return rc == -EHWPOISON; | |
1175 | } | |
1176 | ||
2fc84311 XG |
1177 | /* |
1178 | * The atomic path to get the writable pfn which will be stored in @pfn, | |
1179 | * true indicates success, otherwise false is returned. | |
1180 | */ | |
1181 | static bool hva_to_pfn_fast(unsigned long addr, bool atomic, bool *async, | |
1182 | bool write_fault, bool *writable, pfn_t *pfn) | |
954bbbc2 | 1183 | { |
8d4e1288 | 1184 | struct page *page[1]; |
2fc84311 | 1185 | int npages; |
954bbbc2 | 1186 | |
2fc84311 XG |
1187 | if (!(async || atomic)) |
1188 | return false; | |
af585b92 | 1189 | |
12ce13fe XG |
1190 | /* |
1191 | * Fast pin a writable pfn only if it is a write fault request | |
1192 | * or the caller allows to map a writable pfn for a read fault | |
1193 | * request. | |
1194 | */ | |
1195 | if (!(write_fault || writable)) | |
1196 | return false; | |
612819c3 | 1197 | |
2fc84311 XG |
1198 | npages = __get_user_pages_fast(addr, 1, 1, page); |
1199 | if (npages == 1) { | |
1200 | *pfn = page_to_pfn(page[0]); | |
612819c3 | 1201 | |
2fc84311 XG |
1202 | if (writable) |
1203 | *writable = true; | |
1204 | return true; | |
1205 | } | |
af585b92 | 1206 | |
2fc84311 XG |
1207 | return false; |
1208 | } | |
612819c3 | 1209 | |
2fc84311 XG |
1210 | /* |
1211 | * The slow path to get the pfn of the specified host virtual address, | |
1212 | * 1 indicates success, -errno is returned if error is detected. | |
1213 | */ | |
1214 | static int hva_to_pfn_slow(unsigned long addr, bool *async, bool write_fault, | |
1215 | bool *writable, pfn_t *pfn) | |
1216 | { | |
1217 | struct page *page[1]; | |
1218 | int npages = 0; | |
612819c3 | 1219 | |
2fc84311 XG |
1220 | might_sleep(); |
1221 | ||
1222 | if (writable) | |
1223 | *writable = write_fault; | |
1224 | ||
1225 | if (async) { | |
1226 | down_read(¤t->mm->mmap_sem); | |
1227 | npages = get_user_page_nowait(current, current->mm, | |
1228 | addr, write_fault, page); | |
1229 | up_read(¤t->mm->mmap_sem); | |
234b239b ALC |
1230 | } else { |
1231 | /* | |
1232 | * By now we have tried gup_fast, and possibly async_pf, and we | |
1233 | * are certainly not atomic. Time to retry the gup, allowing | |
1234 | * mmap semaphore to be relinquished in the case of IO. | |
1235 | */ | |
1236 | npages = kvm_get_user_page_io(current, current->mm, addr, | |
1237 | write_fault, page); | |
1238 | } | |
2fc84311 XG |
1239 | if (npages != 1) |
1240 | return npages; | |
1241 | ||
1242 | /* map read fault as writable if possible */ | |
12ce13fe | 1243 | if (unlikely(!write_fault) && writable) { |
2fc84311 XG |
1244 | struct page *wpage[1]; |
1245 | ||
1246 | npages = __get_user_pages_fast(addr, 1, 1, wpage); | |
1247 | if (npages == 1) { | |
1248 | *writable = true; | |
1249 | put_page(page[0]); | |
1250 | page[0] = wpage[0]; | |
612819c3 | 1251 | } |
2fc84311 XG |
1252 | |
1253 | npages = 1; | |
887c08ac | 1254 | } |
2fc84311 XG |
1255 | *pfn = page_to_pfn(page[0]); |
1256 | return npages; | |
1257 | } | |
539cb660 | 1258 | |
4d8b81ab XG |
1259 | static bool vma_is_valid(struct vm_area_struct *vma, bool write_fault) |
1260 | { | |
1261 | if (unlikely(!(vma->vm_flags & VM_READ))) | |
1262 | return false; | |
2e2e3738 | 1263 | |
4d8b81ab XG |
1264 | if (write_fault && (unlikely(!(vma->vm_flags & VM_WRITE)))) |
1265 | return false; | |
887c08ac | 1266 | |
4d8b81ab XG |
1267 | return true; |
1268 | } | |
bf998156 | 1269 | |
12ce13fe XG |
1270 | /* |
1271 | * Pin guest page in memory and return its pfn. | |
1272 | * @addr: host virtual address which maps memory to the guest | |
1273 | * @atomic: whether this function can sleep | |
1274 | * @async: whether this function need to wait IO complete if the | |
1275 | * host page is not in the memory | |
1276 | * @write_fault: whether we should get a writable host page | |
1277 | * @writable: whether it allows to map a writable host page for !@write_fault | |
1278 | * | |
1279 | * The function will map a writable host page for these two cases: | |
1280 | * 1): @write_fault = true | |
1281 | * 2): @write_fault = false && @writable, @writable will tell the caller | |
1282 | * whether the mapping is writable. | |
1283 | */ | |
2fc84311 XG |
1284 | static pfn_t hva_to_pfn(unsigned long addr, bool atomic, bool *async, |
1285 | bool write_fault, bool *writable) | |
1286 | { | |
1287 | struct vm_area_struct *vma; | |
1288 | pfn_t pfn = 0; | |
1289 | int npages; | |
2e2e3738 | 1290 | |
2fc84311 XG |
1291 | /* we can do it either atomically or asynchronously, not both */ |
1292 | BUG_ON(atomic && async); | |
8d4e1288 | 1293 | |
2fc84311 XG |
1294 | if (hva_to_pfn_fast(addr, atomic, async, write_fault, writable, &pfn)) |
1295 | return pfn; | |
1296 | ||
1297 | if (atomic) | |
1298 | return KVM_PFN_ERR_FAULT; | |
1299 | ||
1300 | npages = hva_to_pfn_slow(addr, async, write_fault, writable, &pfn); | |
1301 | if (npages == 1) | |
1302 | return pfn; | |
8d4e1288 | 1303 | |
2fc84311 XG |
1304 | down_read(¤t->mm->mmap_sem); |
1305 | if (npages == -EHWPOISON || | |
1306 | (!async && check_user_page_hwpoison(addr))) { | |
1307 | pfn = KVM_PFN_ERR_HWPOISON; | |
1308 | goto exit; | |
1309 | } | |
1310 | ||
1311 | vma = find_vma_intersection(current->mm, addr, addr + 1); | |
1312 | ||
1313 | if (vma == NULL) | |
1314 | pfn = KVM_PFN_ERR_FAULT; | |
1315 | else if ((vma->vm_flags & VM_PFNMAP)) { | |
1316 | pfn = ((addr - vma->vm_start) >> PAGE_SHIFT) + | |
1317 | vma->vm_pgoff; | |
bf4bea8e | 1318 | BUG_ON(!kvm_is_reserved_pfn(pfn)); |
2fc84311 | 1319 | } else { |
4d8b81ab | 1320 | if (async && vma_is_valid(vma, write_fault)) |
2fc84311 XG |
1321 | *async = true; |
1322 | pfn = KVM_PFN_ERR_FAULT; | |
1323 | } | |
1324 | exit: | |
1325 | up_read(¤t->mm->mmap_sem); | |
2e2e3738 | 1326 | return pfn; |
35149e21 AL |
1327 | } |
1328 | ||
4d8b81ab XG |
1329 | static pfn_t |
1330 | __gfn_to_pfn_memslot(struct kvm_memory_slot *slot, gfn_t gfn, bool atomic, | |
1331 | bool *async, bool write_fault, bool *writable) | |
887c08ac | 1332 | { |
4d8b81ab XG |
1333 | unsigned long addr = __gfn_to_hva_many(slot, gfn, NULL, write_fault); |
1334 | ||
1335 | if (addr == KVM_HVA_ERR_RO_BAD) | |
1336 | return KVM_PFN_ERR_RO_FAULT; | |
1337 | ||
1338 | if (kvm_is_error_hva(addr)) | |
81c52c56 | 1339 | return KVM_PFN_NOSLOT; |
4d8b81ab XG |
1340 | |
1341 | /* Do not map writable pfn in the readonly memslot. */ | |
1342 | if (writable && memslot_is_readonly(slot)) { | |
1343 | *writable = false; | |
1344 | writable = NULL; | |
1345 | } | |
1346 | ||
1347 | return hva_to_pfn(addr, atomic, async, write_fault, | |
1348 | writable); | |
887c08ac | 1349 | } |
887c08ac | 1350 | |
612819c3 MT |
1351 | static pfn_t __gfn_to_pfn(struct kvm *kvm, gfn_t gfn, bool atomic, bool *async, |
1352 | bool write_fault, bool *writable) | |
506f0d6f | 1353 | { |
4d8b81ab | 1354 | struct kvm_memory_slot *slot; |
506f0d6f | 1355 | |
af585b92 GN |
1356 | if (async) |
1357 | *async = false; | |
1358 | ||
4d8b81ab | 1359 | slot = gfn_to_memslot(kvm, gfn); |
506f0d6f | 1360 | |
4d8b81ab XG |
1361 | return __gfn_to_pfn_memslot(slot, gfn, atomic, async, write_fault, |
1362 | writable); | |
365fb3fd XG |
1363 | } |
1364 | ||
1365 | pfn_t gfn_to_pfn_atomic(struct kvm *kvm, gfn_t gfn) | |
1366 | { | |
612819c3 | 1367 | return __gfn_to_pfn(kvm, gfn, true, NULL, true, NULL); |
365fb3fd XG |
1368 | } |
1369 | EXPORT_SYMBOL_GPL(gfn_to_pfn_atomic); | |
1370 | ||
612819c3 MT |
1371 | pfn_t gfn_to_pfn_async(struct kvm *kvm, gfn_t gfn, bool *async, |
1372 | bool write_fault, bool *writable) | |
af585b92 | 1373 | { |
612819c3 | 1374 | return __gfn_to_pfn(kvm, gfn, false, async, write_fault, writable); |
af585b92 GN |
1375 | } |
1376 | EXPORT_SYMBOL_GPL(gfn_to_pfn_async); | |
1377 | ||
365fb3fd XG |
1378 | pfn_t gfn_to_pfn(struct kvm *kvm, gfn_t gfn) |
1379 | { | |
612819c3 | 1380 | return __gfn_to_pfn(kvm, gfn, false, NULL, true, NULL); |
506f0d6f | 1381 | } |
35149e21 AL |
1382 | EXPORT_SYMBOL_GPL(gfn_to_pfn); |
1383 | ||
612819c3 MT |
1384 | pfn_t gfn_to_pfn_prot(struct kvm *kvm, gfn_t gfn, bool write_fault, |
1385 | bool *writable) | |
1386 | { | |
1387 | return __gfn_to_pfn(kvm, gfn, false, NULL, write_fault, writable); | |
1388 | } | |
1389 | EXPORT_SYMBOL_GPL(gfn_to_pfn_prot); | |
1390 | ||
d5661048 | 1391 | pfn_t gfn_to_pfn_memslot(struct kvm_memory_slot *slot, gfn_t gfn) |
506f0d6f | 1392 | { |
4d8b81ab | 1393 | return __gfn_to_pfn_memslot(slot, gfn, false, NULL, true, NULL); |
506f0d6f MT |
1394 | } |
1395 | ||
037d92dc | 1396 | pfn_t gfn_to_pfn_memslot_atomic(struct kvm_memory_slot *slot, gfn_t gfn) |
506f0d6f | 1397 | { |
4d8b81ab | 1398 | return __gfn_to_pfn_memslot(slot, gfn, true, NULL, true, NULL); |
506f0d6f | 1399 | } |
037d92dc | 1400 | EXPORT_SYMBOL_GPL(gfn_to_pfn_memslot_atomic); |
506f0d6f | 1401 | |
48987781 XG |
1402 | int gfn_to_page_many_atomic(struct kvm *kvm, gfn_t gfn, struct page **pages, |
1403 | int nr_pages) | |
1404 | { | |
1405 | unsigned long addr; | |
1406 | gfn_t entry; | |
1407 | ||
49c7754c | 1408 | addr = gfn_to_hva_many(gfn_to_memslot(kvm, gfn), gfn, &entry); |
48987781 XG |
1409 | if (kvm_is_error_hva(addr)) |
1410 | return -1; | |
1411 | ||
1412 | if (entry < nr_pages) | |
1413 | return 0; | |
1414 | ||
1415 | return __get_user_pages_fast(addr, nr_pages, 1, pages); | |
1416 | } | |
1417 | EXPORT_SYMBOL_GPL(gfn_to_page_many_atomic); | |
1418 | ||
a2766325 XG |
1419 | static struct page *kvm_pfn_to_page(pfn_t pfn) |
1420 | { | |
81c52c56 | 1421 | if (is_error_noslot_pfn(pfn)) |
cb9aaa30 | 1422 | return KVM_ERR_PTR_BAD_PAGE; |
a2766325 | 1423 | |
bf4bea8e | 1424 | if (kvm_is_reserved_pfn(pfn)) { |
cb9aaa30 | 1425 | WARN_ON(1); |
6cede2e6 | 1426 | return KVM_ERR_PTR_BAD_PAGE; |
cb9aaa30 | 1427 | } |
a2766325 XG |
1428 | |
1429 | return pfn_to_page(pfn); | |
1430 | } | |
1431 | ||
35149e21 AL |
1432 | struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn) |
1433 | { | |
2e2e3738 AL |
1434 | pfn_t pfn; |
1435 | ||
1436 | pfn = gfn_to_pfn(kvm, gfn); | |
2e2e3738 | 1437 | |
a2766325 | 1438 | return kvm_pfn_to_page(pfn); |
954bbbc2 | 1439 | } |
aab61cc0 | 1440 | |
954bbbc2 AK |
1441 | EXPORT_SYMBOL_GPL(gfn_to_page); |
1442 | ||
b4231d61 IE |
1443 | void kvm_release_page_clean(struct page *page) |
1444 | { | |
32cad84f XG |
1445 | WARN_ON(is_error_page(page)); |
1446 | ||
35149e21 | 1447 | kvm_release_pfn_clean(page_to_pfn(page)); |
b4231d61 IE |
1448 | } |
1449 | EXPORT_SYMBOL_GPL(kvm_release_page_clean); | |
1450 | ||
35149e21 AL |
1451 | void kvm_release_pfn_clean(pfn_t pfn) |
1452 | { | |
bf4bea8e | 1453 | if (!is_error_noslot_pfn(pfn) && !kvm_is_reserved_pfn(pfn)) |
2e2e3738 | 1454 | put_page(pfn_to_page(pfn)); |
35149e21 AL |
1455 | } |
1456 | EXPORT_SYMBOL_GPL(kvm_release_pfn_clean); | |
1457 | ||
b4231d61 | 1458 | void kvm_release_page_dirty(struct page *page) |
8a7ae055 | 1459 | { |
a2766325 XG |
1460 | WARN_ON(is_error_page(page)); |
1461 | ||
35149e21 AL |
1462 | kvm_release_pfn_dirty(page_to_pfn(page)); |
1463 | } | |
1464 | EXPORT_SYMBOL_GPL(kvm_release_page_dirty); | |
1465 | ||
7940876e | 1466 | static void kvm_release_pfn_dirty(pfn_t pfn) |
35149e21 AL |
1467 | { |
1468 | kvm_set_pfn_dirty(pfn); | |
1469 | kvm_release_pfn_clean(pfn); | |
1470 | } | |
35149e21 AL |
1471 | |
1472 | void kvm_set_pfn_dirty(pfn_t pfn) | |
1473 | { | |
bf4bea8e | 1474 | if (!kvm_is_reserved_pfn(pfn)) { |
2e2e3738 AL |
1475 | struct page *page = pfn_to_page(pfn); |
1476 | if (!PageReserved(page)) | |
1477 | SetPageDirty(page); | |
1478 | } | |
8a7ae055 | 1479 | } |
35149e21 AL |
1480 | EXPORT_SYMBOL_GPL(kvm_set_pfn_dirty); |
1481 | ||
1482 | void kvm_set_pfn_accessed(pfn_t pfn) | |
1483 | { | |
bf4bea8e | 1484 | if (!kvm_is_reserved_pfn(pfn)) |
2e2e3738 | 1485 | mark_page_accessed(pfn_to_page(pfn)); |
35149e21 AL |
1486 | } |
1487 | EXPORT_SYMBOL_GPL(kvm_set_pfn_accessed); | |
1488 | ||
1489 | void kvm_get_pfn(pfn_t pfn) | |
1490 | { | |
bf4bea8e | 1491 | if (!kvm_is_reserved_pfn(pfn)) |
2e2e3738 | 1492 | get_page(pfn_to_page(pfn)); |
35149e21 AL |
1493 | } |
1494 | EXPORT_SYMBOL_GPL(kvm_get_pfn); | |
8a7ae055 | 1495 | |
195aefde IE |
1496 | static int next_segment(unsigned long len, int offset) |
1497 | { | |
1498 | if (len > PAGE_SIZE - offset) | |
1499 | return PAGE_SIZE - offset; | |
1500 | else | |
1501 | return len; | |
1502 | } | |
1503 | ||
1504 | int kvm_read_guest_page(struct kvm *kvm, gfn_t gfn, void *data, int offset, | |
1505 | int len) | |
1506 | { | |
e0506bcb IE |
1507 | int r; |
1508 | unsigned long addr; | |
195aefde | 1509 | |
ba6a3541 | 1510 | addr = gfn_to_hva_prot(kvm, gfn, NULL); |
e0506bcb IE |
1511 | if (kvm_is_error_hva(addr)) |
1512 | return -EFAULT; | |
86ab8cff | 1513 | r = kvm_read_hva(data, (void __user *)addr + offset, len); |
e0506bcb | 1514 | if (r) |
195aefde | 1515 | return -EFAULT; |
195aefde IE |
1516 | return 0; |
1517 | } | |
1518 | EXPORT_SYMBOL_GPL(kvm_read_guest_page); | |
1519 | ||
1520 | int kvm_read_guest(struct kvm *kvm, gpa_t gpa, void *data, unsigned long len) | |
1521 | { | |
1522 | gfn_t gfn = gpa >> PAGE_SHIFT; | |
1523 | int seg; | |
1524 | int offset = offset_in_page(gpa); | |
1525 | int ret; | |
1526 | ||
1527 | while ((seg = next_segment(len, offset)) != 0) { | |
1528 | ret = kvm_read_guest_page(kvm, gfn, data, offset, seg); | |
1529 | if (ret < 0) | |
1530 | return ret; | |
1531 | offset = 0; | |
1532 | len -= seg; | |
1533 | data += seg; | |
1534 | ++gfn; | |
1535 | } | |
1536 | return 0; | |
1537 | } | |
1538 | EXPORT_SYMBOL_GPL(kvm_read_guest); | |
1539 | ||
7ec54588 MT |
1540 | int kvm_read_guest_atomic(struct kvm *kvm, gpa_t gpa, void *data, |
1541 | unsigned long len) | |
1542 | { | |
1543 | int r; | |
1544 | unsigned long addr; | |
1545 | gfn_t gfn = gpa >> PAGE_SHIFT; | |
1546 | int offset = offset_in_page(gpa); | |
1547 | ||
ba6a3541 | 1548 | addr = gfn_to_hva_prot(kvm, gfn, NULL); |
7ec54588 MT |
1549 | if (kvm_is_error_hva(addr)) |
1550 | return -EFAULT; | |
0aac03f0 | 1551 | pagefault_disable(); |
86ab8cff | 1552 | r = kvm_read_hva_atomic(data, (void __user *)addr + offset, len); |
0aac03f0 | 1553 | pagefault_enable(); |
7ec54588 MT |
1554 | if (r) |
1555 | return -EFAULT; | |
1556 | return 0; | |
1557 | } | |
1558 | EXPORT_SYMBOL(kvm_read_guest_atomic); | |
1559 | ||
195aefde IE |
1560 | int kvm_write_guest_page(struct kvm *kvm, gfn_t gfn, const void *data, |
1561 | int offset, int len) | |
1562 | { | |
e0506bcb IE |
1563 | int r; |
1564 | unsigned long addr; | |
195aefde | 1565 | |
e0506bcb IE |
1566 | addr = gfn_to_hva(kvm, gfn); |
1567 | if (kvm_is_error_hva(addr)) | |
1568 | return -EFAULT; | |
8b0cedff | 1569 | r = __copy_to_user((void __user *)addr + offset, data, len); |
e0506bcb | 1570 | if (r) |
195aefde | 1571 | return -EFAULT; |
195aefde IE |
1572 | mark_page_dirty(kvm, gfn); |
1573 | return 0; | |
1574 | } | |
1575 | EXPORT_SYMBOL_GPL(kvm_write_guest_page); | |
1576 | ||
1577 | int kvm_write_guest(struct kvm *kvm, gpa_t gpa, const void *data, | |
1578 | unsigned long len) | |
1579 | { | |
1580 | gfn_t gfn = gpa >> PAGE_SHIFT; | |
1581 | int seg; | |
1582 | int offset = offset_in_page(gpa); | |
1583 | int ret; | |
1584 | ||
1585 | while ((seg = next_segment(len, offset)) != 0) { | |
1586 | ret = kvm_write_guest_page(kvm, gfn, data, offset, seg); | |
1587 | if (ret < 0) | |
1588 | return ret; | |
1589 | offset = 0; | |
1590 | len -= seg; | |
1591 | data += seg; | |
1592 | ++gfn; | |
1593 | } | |
1594 | return 0; | |
1595 | } | |
1596 | ||
49c7754c | 1597 | int kvm_gfn_to_hva_cache_init(struct kvm *kvm, struct gfn_to_hva_cache *ghc, |
8f964525 | 1598 | gpa_t gpa, unsigned long len) |
49c7754c GN |
1599 | { |
1600 | struct kvm_memslots *slots = kvm_memslots(kvm); | |
1601 | int offset = offset_in_page(gpa); | |
8f964525 AH |
1602 | gfn_t start_gfn = gpa >> PAGE_SHIFT; |
1603 | gfn_t end_gfn = (gpa + len - 1) >> PAGE_SHIFT; | |
1604 | gfn_t nr_pages_needed = end_gfn - start_gfn + 1; | |
1605 | gfn_t nr_pages_avail; | |
49c7754c GN |
1606 | |
1607 | ghc->gpa = gpa; | |
1608 | ghc->generation = slots->generation; | |
8f964525 AH |
1609 | ghc->len = len; |
1610 | ghc->memslot = gfn_to_memslot(kvm, start_gfn); | |
1611 | ghc->hva = gfn_to_hva_many(ghc->memslot, start_gfn, &nr_pages_avail); | |
1612 | if (!kvm_is_error_hva(ghc->hva) && nr_pages_avail >= nr_pages_needed) { | |
49c7754c | 1613 | ghc->hva += offset; |
8f964525 AH |
1614 | } else { |
1615 | /* | |
1616 | * If the requested region crosses two memslots, we still | |
1617 | * verify that the entire region is valid here. | |
1618 | */ | |
1619 | while (start_gfn <= end_gfn) { | |
1620 | ghc->memslot = gfn_to_memslot(kvm, start_gfn); | |
1621 | ghc->hva = gfn_to_hva_many(ghc->memslot, start_gfn, | |
1622 | &nr_pages_avail); | |
1623 | if (kvm_is_error_hva(ghc->hva)) | |
1624 | return -EFAULT; | |
1625 | start_gfn += nr_pages_avail; | |
1626 | } | |
1627 | /* Use the slow path for cross page reads and writes. */ | |
1628 | ghc->memslot = NULL; | |
1629 | } | |
49c7754c GN |
1630 | return 0; |
1631 | } | |
1632 | EXPORT_SYMBOL_GPL(kvm_gfn_to_hva_cache_init); | |
1633 | ||
1634 | int kvm_write_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc, | |
1635 | void *data, unsigned long len) | |
1636 | { | |
1637 | struct kvm_memslots *slots = kvm_memslots(kvm); | |
1638 | int r; | |
1639 | ||
8f964525 AH |
1640 | BUG_ON(len > ghc->len); |
1641 | ||
49c7754c | 1642 | if (slots->generation != ghc->generation) |
8f964525 AH |
1643 | kvm_gfn_to_hva_cache_init(kvm, ghc, ghc->gpa, ghc->len); |
1644 | ||
1645 | if (unlikely(!ghc->memslot)) | |
1646 | return kvm_write_guest(kvm, ghc->gpa, data, len); | |
49c7754c GN |
1647 | |
1648 | if (kvm_is_error_hva(ghc->hva)) | |
1649 | return -EFAULT; | |
1650 | ||
8b0cedff | 1651 | r = __copy_to_user((void __user *)ghc->hva, data, len); |
49c7754c GN |
1652 | if (r) |
1653 | return -EFAULT; | |
1654 | mark_page_dirty_in_slot(kvm, ghc->memslot, ghc->gpa >> PAGE_SHIFT); | |
1655 | ||
1656 | return 0; | |
1657 | } | |
1658 | EXPORT_SYMBOL_GPL(kvm_write_guest_cached); | |
1659 | ||
e03b644f GN |
1660 | int kvm_read_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc, |
1661 | void *data, unsigned long len) | |
1662 | { | |
1663 | struct kvm_memslots *slots = kvm_memslots(kvm); | |
1664 | int r; | |
1665 | ||
8f964525 AH |
1666 | BUG_ON(len > ghc->len); |
1667 | ||
e03b644f | 1668 | if (slots->generation != ghc->generation) |
8f964525 AH |
1669 | kvm_gfn_to_hva_cache_init(kvm, ghc, ghc->gpa, ghc->len); |
1670 | ||
1671 | if (unlikely(!ghc->memslot)) | |
1672 | return kvm_read_guest(kvm, ghc->gpa, data, len); | |
e03b644f GN |
1673 | |
1674 | if (kvm_is_error_hva(ghc->hva)) | |
1675 | return -EFAULT; | |
1676 | ||
1677 | r = __copy_from_user(data, (void __user *)ghc->hva, len); | |
1678 | if (r) | |
1679 | return -EFAULT; | |
1680 | ||
1681 | return 0; | |
1682 | } | |
1683 | EXPORT_SYMBOL_GPL(kvm_read_guest_cached); | |
1684 | ||
195aefde IE |
1685 | int kvm_clear_guest_page(struct kvm *kvm, gfn_t gfn, int offset, int len) |
1686 | { | |
8a3caa6d HC |
1687 | const void *zero_page = (const void *) __va(page_to_phys(ZERO_PAGE(0))); |
1688 | ||
1689 | return kvm_write_guest_page(kvm, gfn, zero_page, offset, len); | |
195aefde IE |
1690 | } |
1691 | EXPORT_SYMBOL_GPL(kvm_clear_guest_page); | |
1692 | ||
1693 | int kvm_clear_guest(struct kvm *kvm, gpa_t gpa, unsigned long len) | |
1694 | { | |
1695 | gfn_t gfn = gpa >> PAGE_SHIFT; | |
1696 | int seg; | |
1697 | int offset = offset_in_page(gpa); | |
1698 | int ret; | |
1699 | ||
1700 | while ((seg = next_segment(len, offset)) != 0) { | |
1701 | ret = kvm_clear_guest_page(kvm, gfn, offset, seg); | |
1702 | if (ret < 0) | |
1703 | return ret; | |
1704 | offset = 0; | |
1705 | len -= seg; | |
1706 | ++gfn; | |
1707 | } | |
1708 | return 0; | |
1709 | } | |
1710 | EXPORT_SYMBOL_GPL(kvm_clear_guest); | |
1711 | ||
7940876e SH |
1712 | static void mark_page_dirty_in_slot(struct kvm *kvm, |
1713 | struct kvm_memory_slot *memslot, | |
1714 | gfn_t gfn) | |
6aa8b732 | 1715 | { |
7e9d619d RR |
1716 | if (memslot && memslot->dirty_bitmap) { |
1717 | unsigned long rel_gfn = gfn - memslot->base_gfn; | |
6aa8b732 | 1718 | |
b74ca3b3 | 1719 | set_bit_le(rel_gfn, memslot->dirty_bitmap); |
6aa8b732 AK |
1720 | } |
1721 | } | |
1722 | ||
49c7754c GN |
1723 | void mark_page_dirty(struct kvm *kvm, gfn_t gfn) |
1724 | { | |
1725 | struct kvm_memory_slot *memslot; | |
1726 | ||
1727 | memslot = gfn_to_memslot(kvm, gfn); | |
1728 | mark_page_dirty_in_slot(kvm, memslot, gfn); | |
1729 | } | |
2ba9f0d8 | 1730 | EXPORT_SYMBOL_GPL(mark_page_dirty); |
49c7754c | 1731 | |
b6958ce4 ED |
1732 | /* |
1733 | * The vCPU has executed a HLT instruction with in-kernel mode enabled. | |
1734 | */ | |
8776e519 | 1735 | void kvm_vcpu_block(struct kvm_vcpu *vcpu) |
d3bef15f | 1736 | { |
e5c239cf MT |
1737 | DEFINE_WAIT(wait); |
1738 | ||
1739 | for (;;) { | |
1740 | prepare_to_wait(&vcpu->wq, &wait, TASK_INTERRUPTIBLE); | |
1741 | ||
a1b37100 | 1742 | if (kvm_arch_vcpu_runnable(vcpu)) { |
a8eeb04a | 1743 | kvm_make_request(KVM_REQ_UNHALT, vcpu); |
e5c239cf | 1744 | break; |
d7690175 | 1745 | } |
09cec754 GN |
1746 | if (kvm_cpu_has_pending_timer(vcpu)) |
1747 | break; | |
e5c239cf MT |
1748 | if (signal_pending(current)) |
1749 | break; | |
1750 | ||
b6958ce4 | 1751 | schedule(); |
b6958ce4 | 1752 | } |
d3bef15f | 1753 | |
e5c239cf | 1754 | finish_wait(&vcpu->wq, &wait); |
b6958ce4 | 1755 | } |
2ba9f0d8 | 1756 | EXPORT_SYMBOL_GPL(kvm_vcpu_block); |
b6958ce4 | 1757 | |
8c84780d | 1758 | #ifndef CONFIG_S390 |
b6d33834 CD |
1759 | /* |
1760 | * Kick a sleeping VCPU, or a guest VCPU in guest mode, into host kernel mode. | |
1761 | */ | |
1762 | void kvm_vcpu_kick(struct kvm_vcpu *vcpu) | |
1763 | { | |
1764 | int me; | |
1765 | int cpu = vcpu->cpu; | |
1766 | wait_queue_head_t *wqp; | |
1767 | ||
1768 | wqp = kvm_arch_vcpu_wq(vcpu); | |
1769 | if (waitqueue_active(wqp)) { | |
1770 | wake_up_interruptible(wqp); | |
1771 | ++vcpu->stat.halt_wakeup; | |
1772 | } | |
1773 | ||
1774 | me = get_cpu(); | |
1775 | if (cpu != me && (unsigned)cpu < nr_cpu_ids && cpu_online(cpu)) | |
1776 | if (kvm_arch_vcpu_should_kick(vcpu)) | |
1777 | smp_send_reschedule(cpu); | |
1778 | put_cpu(); | |
1779 | } | |
a20ed54d | 1780 | EXPORT_SYMBOL_GPL(kvm_vcpu_kick); |
8c84780d | 1781 | #endif /* !CONFIG_S390 */ |
b6d33834 | 1782 | |
fa93384f | 1783 | int kvm_vcpu_yield_to(struct kvm_vcpu *target) |
41628d33 KW |
1784 | { |
1785 | struct pid *pid; | |
1786 | struct task_struct *task = NULL; | |
fa93384f | 1787 | int ret = 0; |
41628d33 KW |
1788 | |
1789 | rcu_read_lock(); | |
1790 | pid = rcu_dereference(target->pid); | |
1791 | if (pid) | |
27fbe64b | 1792 | task = get_pid_task(pid, PIDTYPE_PID); |
41628d33 KW |
1793 | rcu_read_unlock(); |
1794 | if (!task) | |
c45c528e | 1795 | return ret; |
c45c528e | 1796 | ret = yield_to(task, 1); |
41628d33 | 1797 | put_task_struct(task); |
c45c528e R |
1798 | |
1799 | return ret; | |
41628d33 KW |
1800 | } |
1801 | EXPORT_SYMBOL_GPL(kvm_vcpu_yield_to); | |
1802 | ||
06e48c51 R |
1803 | /* |
1804 | * Helper that checks whether a VCPU is eligible for directed yield. | |
1805 | * Most eligible candidate to yield is decided by following heuristics: | |
1806 | * | |
1807 | * (a) VCPU which has not done pl-exit or cpu relax intercepted recently | |
1808 | * (preempted lock holder), indicated by @in_spin_loop. | |
1809 | * Set at the beiginning and cleared at the end of interception/PLE handler. | |
1810 | * | |
1811 | * (b) VCPU which has done pl-exit/ cpu relax intercepted but did not get | |
1812 | * chance last time (mostly it has become eligible now since we have probably | |
1813 | * yielded to lockholder in last iteration. This is done by toggling | |
1814 | * @dy_eligible each time a VCPU checked for eligibility.) | |
1815 | * | |
1816 | * Yielding to a recently pl-exited/cpu relax intercepted VCPU before yielding | |
1817 | * to preempted lock-holder could result in wrong VCPU selection and CPU | |
1818 | * burning. Giving priority for a potential lock-holder increases lock | |
1819 | * progress. | |
1820 | * | |
1821 | * Since algorithm is based on heuristics, accessing another VCPU data without | |
1822 | * locking does not harm. It may result in trying to yield to same VCPU, fail | |
1823 | * and continue with next VCPU and so on. | |
1824 | */ | |
7940876e | 1825 | static bool kvm_vcpu_eligible_for_directed_yield(struct kvm_vcpu *vcpu) |
06e48c51 | 1826 | { |
4a55dd72 | 1827 | #ifdef CONFIG_HAVE_KVM_CPU_RELAX_INTERCEPT |
06e48c51 R |
1828 | bool eligible; |
1829 | ||
1830 | eligible = !vcpu->spin_loop.in_spin_loop || | |
34656113 | 1831 | vcpu->spin_loop.dy_eligible; |
06e48c51 R |
1832 | |
1833 | if (vcpu->spin_loop.in_spin_loop) | |
1834 | kvm_vcpu_set_dy_eligible(vcpu, !vcpu->spin_loop.dy_eligible); | |
1835 | ||
1836 | return eligible; | |
4a55dd72 SW |
1837 | #else |
1838 | return true; | |
06e48c51 | 1839 | #endif |
4a55dd72 | 1840 | } |
c45c528e | 1841 | |
217ece61 | 1842 | void kvm_vcpu_on_spin(struct kvm_vcpu *me) |
d255f4f2 | 1843 | { |
217ece61 RR |
1844 | struct kvm *kvm = me->kvm; |
1845 | struct kvm_vcpu *vcpu; | |
1846 | int last_boosted_vcpu = me->kvm->last_boosted_vcpu; | |
1847 | int yielded = 0; | |
c45c528e | 1848 | int try = 3; |
217ece61 RR |
1849 | int pass; |
1850 | int i; | |
d255f4f2 | 1851 | |
4c088493 | 1852 | kvm_vcpu_set_in_spin_loop(me, true); |
217ece61 RR |
1853 | /* |
1854 | * We boost the priority of a VCPU that is runnable but not | |
1855 | * currently running, because it got preempted by something | |
1856 | * else and called schedule in __vcpu_run. Hopefully that | |
1857 | * VCPU is holding the lock that we need and will release it. | |
1858 | * We approximate round-robin by starting at the last boosted VCPU. | |
1859 | */ | |
c45c528e | 1860 | for (pass = 0; pass < 2 && !yielded && try; pass++) { |
217ece61 | 1861 | kvm_for_each_vcpu(i, vcpu, kvm) { |
5cfc2aab | 1862 | if (!pass && i <= last_boosted_vcpu) { |
217ece61 RR |
1863 | i = last_boosted_vcpu; |
1864 | continue; | |
1865 | } else if (pass && i > last_boosted_vcpu) | |
1866 | break; | |
7bc7ae25 R |
1867 | if (!ACCESS_ONCE(vcpu->preempted)) |
1868 | continue; | |
217ece61 RR |
1869 | if (vcpu == me) |
1870 | continue; | |
98f4a146 | 1871 | if (waitqueue_active(&vcpu->wq) && !kvm_arch_vcpu_runnable(vcpu)) |
217ece61 | 1872 | continue; |
06e48c51 R |
1873 | if (!kvm_vcpu_eligible_for_directed_yield(vcpu)) |
1874 | continue; | |
c45c528e R |
1875 | |
1876 | yielded = kvm_vcpu_yield_to(vcpu); | |
1877 | if (yielded > 0) { | |
217ece61 | 1878 | kvm->last_boosted_vcpu = i; |
217ece61 | 1879 | break; |
c45c528e R |
1880 | } else if (yielded < 0) { |
1881 | try--; | |
1882 | if (!try) | |
1883 | break; | |
217ece61 | 1884 | } |
217ece61 RR |
1885 | } |
1886 | } | |
4c088493 | 1887 | kvm_vcpu_set_in_spin_loop(me, false); |
06e48c51 R |
1888 | |
1889 | /* Ensure vcpu is not eligible during next spinloop */ | |
1890 | kvm_vcpu_set_dy_eligible(me, false); | |
d255f4f2 ZE |
1891 | } |
1892 | EXPORT_SYMBOL_GPL(kvm_vcpu_on_spin); | |
1893 | ||
e4a533a4 | 1894 | static int kvm_vcpu_fault(struct vm_area_struct *vma, struct vm_fault *vmf) |
9a2bb7f4 AK |
1895 | { |
1896 | struct kvm_vcpu *vcpu = vma->vm_file->private_data; | |
9a2bb7f4 AK |
1897 | struct page *page; |
1898 | ||
e4a533a4 | 1899 | if (vmf->pgoff == 0) |
039576c0 | 1900 | page = virt_to_page(vcpu->run); |
09566765 | 1901 | #ifdef CONFIG_X86 |
e4a533a4 | 1902 | else if (vmf->pgoff == KVM_PIO_PAGE_OFFSET) |
ad312c7c | 1903 | page = virt_to_page(vcpu->arch.pio_data); |
5f94c174 LV |
1904 | #endif |
1905 | #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET | |
1906 | else if (vmf->pgoff == KVM_COALESCED_MMIO_PAGE_OFFSET) | |
1907 | page = virt_to_page(vcpu->kvm->coalesced_mmio_ring); | |
09566765 | 1908 | #endif |
039576c0 | 1909 | else |
5b1c1493 | 1910 | return kvm_arch_vcpu_fault(vcpu, vmf); |
9a2bb7f4 | 1911 | get_page(page); |
e4a533a4 | 1912 | vmf->page = page; |
1913 | return 0; | |
9a2bb7f4 AK |
1914 | } |
1915 | ||
f0f37e2f | 1916 | static const struct vm_operations_struct kvm_vcpu_vm_ops = { |
e4a533a4 | 1917 | .fault = kvm_vcpu_fault, |
9a2bb7f4 AK |
1918 | }; |
1919 | ||
1920 | static int kvm_vcpu_mmap(struct file *file, struct vm_area_struct *vma) | |
1921 | { | |
1922 | vma->vm_ops = &kvm_vcpu_vm_ops; | |
1923 | return 0; | |
1924 | } | |
1925 | ||
bccf2150 AK |
1926 | static int kvm_vcpu_release(struct inode *inode, struct file *filp) |
1927 | { | |
1928 | struct kvm_vcpu *vcpu = filp->private_data; | |
1929 | ||
66c0b394 | 1930 | kvm_put_kvm(vcpu->kvm); |
bccf2150 AK |
1931 | return 0; |
1932 | } | |
1933 | ||
3d3aab1b | 1934 | static struct file_operations kvm_vcpu_fops = { |
bccf2150 AK |
1935 | .release = kvm_vcpu_release, |
1936 | .unlocked_ioctl = kvm_vcpu_ioctl, | |
1dda606c AG |
1937 | #ifdef CONFIG_COMPAT |
1938 | .compat_ioctl = kvm_vcpu_compat_ioctl, | |
1939 | #endif | |
9a2bb7f4 | 1940 | .mmap = kvm_vcpu_mmap, |
6038f373 | 1941 | .llseek = noop_llseek, |
bccf2150 AK |
1942 | }; |
1943 | ||
1944 | /* | |
1945 | * Allocates an inode for the vcpu. | |
1946 | */ | |
1947 | static int create_vcpu_fd(struct kvm_vcpu *vcpu) | |
1948 | { | |
24009b05 | 1949 | return anon_inode_getfd("kvm-vcpu", &kvm_vcpu_fops, vcpu, O_RDWR | O_CLOEXEC); |
bccf2150 AK |
1950 | } |
1951 | ||
c5ea7660 AK |
1952 | /* |
1953 | * Creates some virtual cpus. Good luck creating more than one. | |
1954 | */ | |
73880c80 | 1955 | static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, u32 id) |
c5ea7660 AK |
1956 | { |
1957 | int r; | |
988a2cae | 1958 | struct kvm_vcpu *vcpu, *v; |
c5ea7660 | 1959 | |
338c7dba AH |
1960 | if (id >= KVM_MAX_VCPUS) |
1961 | return -EINVAL; | |
1962 | ||
73880c80 | 1963 | vcpu = kvm_arch_vcpu_create(kvm, id); |
fb3f0f51 RR |
1964 | if (IS_ERR(vcpu)) |
1965 | return PTR_ERR(vcpu); | |
c5ea7660 | 1966 | |
15ad7146 AK |
1967 | preempt_notifier_init(&vcpu->preempt_notifier, &kvm_preempt_ops); |
1968 | ||
26e5215f AK |
1969 | r = kvm_arch_vcpu_setup(vcpu); |
1970 | if (r) | |
d780592b | 1971 | goto vcpu_destroy; |
26e5215f | 1972 | |
11ec2804 | 1973 | mutex_lock(&kvm->lock); |
3e515705 AK |
1974 | if (!kvm_vcpu_compatible(vcpu)) { |
1975 | r = -EINVAL; | |
1976 | goto unlock_vcpu_destroy; | |
1977 | } | |
73880c80 GN |
1978 | if (atomic_read(&kvm->online_vcpus) == KVM_MAX_VCPUS) { |
1979 | r = -EINVAL; | |
d780592b | 1980 | goto unlock_vcpu_destroy; |
fb3f0f51 | 1981 | } |
73880c80 | 1982 | |
988a2cae GN |
1983 | kvm_for_each_vcpu(r, v, kvm) |
1984 | if (v->vcpu_id == id) { | |
73880c80 | 1985 | r = -EEXIST; |
d780592b | 1986 | goto unlock_vcpu_destroy; |
73880c80 GN |
1987 | } |
1988 | ||
1989 | BUG_ON(kvm->vcpus[atomic_read(&kvm->online_vcpus)]); | |
c5ea7660 | 1990 | |
fb3f0f51 | 1991 | /* Now it's all set up, let userspace reach it */ |
66c0b394 | 1992 | kvm_get_kvm(kvm); |
bccf2150 | 1993 | r = create_vcpu_fd(vcpu); |
73880c80 GN |
1994 | if (r < 0) { |
1995 | kvm_put_kvm(kvm); | |
d780592b | 1996 | goto unlock_vcpu_destroy; |
73880c80 GN |
1997 | } |
1998 | ||
1999 | kvm->vcpus[atomic_read(&kvm->online_vcpus)] = vcpu; | |
2000 | smp_wmb(); | |
2001 | atomic_inc(&kvm->online_vcpus); | |
2002 | ||
73880c80 | 2003 | mutex_unlock(&kvm->lock); |
42897d86 | 2004 | kvm_arch_vcpu_postcreate(vcpu); |
fb3f0f51 | 2005 | return r; |
39c3b86e | 2006 | |
d780592b | 2007 | unlock_vcpu_destroy: |
7d8fece6 | 2008 | mutex_unlock(&kvm->lock); |
d780592b | 2009 | vcpu_destroy: |
d40ccc62 | 2010 | kvm_arch_vcpu_destroy(vcpu); |
c5ea7660 AK |
2011 | return r; |
2012 | } | |
2013 | ||
1961d276 AK |
2014 | static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu *vcpu, sigset_t *sigset) |
2015 | { | |
2016 | if (sigset) { | |
2017 | sigdelsetmask(sigset, sigmask(SIGKILL)|sigmask(SIGSTOP)); | |
2018 | vcpu->sigset_active = 1; | |
2019 | vcpu->sigset = *sigset; | |
2020 | } else | |
2021 | vcpu->sigset_active = 0; | |
2022 | return 0; | |
2023 | } | |
2024 | ||
bccf2150 AK |
2025 | static long kvm_vcpu_ioctl(struct file *filp, |
2026 | unsigned int ioctl, unsigned long arg) | |
6aa8b732 | 2027 | { |
bccf2150 | 2028 | struct kvm_vcpu *vcpu = filp->private_data; |
2f366987 | 2029 | void __user *argp = (void __user *)arg; |
313a3dc7 | 2030 | int r; |
fa3795a7 DH |
2031 | struct kvm_fpu *fpu = NULL; |
2032 | struct kvm_sregs *kvm_sregs = NULL; | |
6aa8b732 | 2033 | |
6d4e4c4f AK |
2034 | if (vcpu->kvm->mm != current->mm) |
2035 | return -EIO; | |
2122ff5e | 2036 | |
2ea75be3 DM |
2037 | if (unlikely(_IOC_TYPE(ioctl) != KVMIO)) |
2038 | return -EINVAL; | |
2039 | ||
2f4d9b54 | 2040 | #if defined(CONFIG_S390) || defined(CONFIG_PPC) || defined(CONFIG_MIPS) |
2122ff5e AK |
2041 | /* |
2042 | * Special cases: vcpu ioctls that are asynchronous to vcpu execution, | |
2043 | * so vcpu_load() would break it. | |
2044 | */ | |
2045 | if (ioctl == KVM_S390_INTERRUPT || ioctl == KVM_INTERRUPT) | |
2046 | return kvm_arch_vcpu_ioctl(filp, ioctl, arg); | |
2047 | #endif | |
2048 | ||
2049 | ||
9fc77441 MT |
2050 | r = vcpu_load(vcpu); |
2051 | if (r) | |
2052 | return r; | |
6aa8b732 | 2053 | switch (ioctl) { |
9a2bb7f4 | 2054 | case KVM_RUN: |
f0fe5108 AK |
2055 | r = -EINVAL; |
2056 | if (arg) | |
2057 | goto out; | |
7a72f7a1 CB |
2058 | if (unlikely(vcpu->pid != current->pids[PIDTYPE_PID].pid)) { |
2059 | /* The thread running this VCPU changed. */ | |
2060 | struct pid *oldpid = vcpu->pid; | |
2061 | struct pid *newpid = get_task_pid(current, PIDTYPE_PID); | |
2062 | rcu_assign_pointer(vcpu->pid, newpid); | |
2063 | if (oldpid) | |
2064 | synchronize_rcu(); | |
2065 | put_pid(oldpid); | |
2066 | } | |
b6c7a5dc | 2067 | r = kvm_arch_vcpu_ioctl_run(vcpu, vcpu->run); |
64be5007 | 2068 | trace_kvm_userspace_exit(vcpu->run->exit_reason, r); |
6aa8b732 | 2069 | break; |
6aa8b732 | 2070 | case KVM_GET_REGS: { |
3e4bb3ac | 2071 | struct kvm_regs *kvm_regs; |
6aa8b732 | 2072 | |
3e4bb3ac XZ |
2073 | r = -ENOMEM; |
2074 | kvm_regs = kzalloc(sizeof(struct kvm_regs), GFP_KERNEL); | |
2075 | if (!kvm_regs) | |
6aa8b732 | 2076 | goto out; |
3e4bb3ac XZ |
2077 | r = kvm_arch_vcpu_ioctl_get_regs(vcpu, kvm_regs); |
2078 | if (r) | |
2079 | goto out_free1; | |
6aa8b732 | 2080 | r = -EFAULT; |
3e4bb3ac XZ |
2081 | if (copy_to_user(argp, kvm_regs, sizeof(struct kvm_regs))) |
2082 | goto out_free1; | |
6aa8b732 | 2083 | r = 0; |
3e4bb3ac XZ |
2084 | out_free1: |
2085 | kfree(kvm_regs); | |
6aa8b732 AK |
2086 | break; |
2087 | } | |
2088 | case KVM_SET_REGS: { | |
3e4bb3ac | 2089 | struct kvm_regs *kvm_regs; |
6aa8b732 | 2090 | |
3e4bb3ac | 2091 | r = -ENOMEM; |
ff5c2c03 SL |
2092 | kvm_regs = memdup_user(argp, sizeof(*kvm_regs)); |
2093 | if (IS_ERR(kvm_regs)) { | |
2094 | r = PTR_ERR(kvm_regs); | |
6aa8b732 | 2095 | goto out; |
ff5c2c03 | 2096 | } |
3e4bb3ac | 2097 | r = kvm_arch_vcpu_ioctl_set_regs(vcpu, kvm_regs); |
3e4bb3ac | 2098 | kfree(kvm_regs); |
6aa8b732 AK |
2099 | break; |
2100 | } | |
2101 | case KVM_GET_SREGS: { | |
fa3795a7 DH |
2102 | kvm_sregs = kzalloc(sizeof(struct kvm_sregs), GFP_KERNEL); |
2103 | r = -ENOMEM; | |
2104 | if (!kvm_sregs) | |
2105 | goto out; | |
2106 | r = kvm_arch_vcpu_ioctl_get_sregs(vcpu, kvm_sregs); | |
6aa8b732 AK |
2107 | if (r) |
2108 | goto out; | |
2109 | r = -EFAULT; | |
fa3795a7 | 2110 | if (copy_to_user(argp, kvm_sregs, sizeof(struct kvm_sregs))) |
6aa8b732 AK |
2111 | goto out; |
2112 | r = 0; | |
2113 | break; | |
2114 | } | |
2115 | case KVM_SET_SREGS: { | |
ff5c2c03 SL |
2116 | kvm_sregs = memdup_user(argp, sizeof(*kvm_sregs)); |
2117 | if (IS_ERR(kvm_sregs)) { | |
2118 | r = PTR_ERR(kvm_sregs); | |
18595411 | 2119 | kvm_sregs = NULL; |
6aa8b732 | 2120 | goto out; |
ff5c2c03 | 2121 | } |
fa3795a7 | 2122 | r = kvm_arch_vcpu_ioctl_set_sregs(vcpu, kvm_sregs); |
6aa8b732 AK |
2123 | break; |
2124 | } | |
62d9f0db MT |
2125 | case KVM_GET_MP_STATE: { |
2126 | struct kvm_mp_state mp_state; | |
2127 | ||
2128 | r = kvm_arch_vcpu_ioctl_get_mpstate(vcpu, &mp_state); | |
2129 | if (r) | |
2130 | goto out; | |
2131 | r = -EFAULT; | |
2132 | if (copy_to_user(argp, &mp_state, sizeof mp_state)) | |
2133 | goto out; | |
2134 | r = 0; | |
2135 | break; | |
2136 | } | |
2137 | case KVM_SET_MP_STATE: { | |
2138 | struct kvm_mp_state mp_state; | |
2139 | ||
2140 | r = -EFAULT; | |
2141 | if (copy_from_user(&mp_state, argp, sizeof mp_state)) | |
2142 | goto out; | |
2143 | r = kvm_arch_vcpu_ioctl_set_mpstate(vcpu, &mp_state); | |
62d9f0db MT |
2144 | break; |
2145 | } | |
6aa8b732 AK |
2146 | case KVM_TRANSLATE: { |
2147 | struct kvm_translation tr; | |
2148 | ||
2149 | r = -EFAULT; | |
2f366987 | 2150 | if (copy_from_user(&tr, argp, sizeof tr)) |
6aa8b732 | 2151 | goto out; |
8b006791 | 2152 | r = kvm_arch_vcpu_ioctl_translate(vcpu, &tr); |
6aa8b732 AK |
2153 | if (r) |
2154 | goto out; | |
2155 | r = -EFAULT; | |
2f366987 | 2156 | if (copy_to_user(argp, &tr, sizeof tr)) |
6aa8b732 AK |
2157 | goto out; |
2158 | r = 0; | |
2159 | break; | |
2160 | } | |
d0bfb940 JK |
2161 | case KVM_SET_GUEST_DEBUG: { |
2162 | struct kvm_guest_debug dbg; | |
6aa8b732 AK |
2163 | |
2164 | r = -EFAULT; | |
2f366987 | 2165 | if (copy_from_user(&dbg, argp, sizeof dbg)) |
6aa8b732 | 2166 | goto out; |
d0bfb940 | 2167 | r = kvm_arch_vcpu_ioctl_set_guest_debug(vcpu, &dbg); |
6aa8b732 AK |
2168 | break; |
2169 | } | |
1961d276 AK |
2170 | case KVM_SET_SIGNAL_MASK: { |
2171 | struct kvm_signal_mask __user *sigmask_arg = argp; | |
2172 | struct kvm_signal_mask kvm_sigmask; | |
2173 | sigset_t sigset, *p; | |
2174 | ||
2175 | p = NULL; | |
2176 | if (argp) { | |
2177 | r = -EFAULT; | |
2178 | if (copy_from_user(&kvm_sigmask, argp, | |
2179 | sizeof kvm_sigmask)) | |
2180 | goto out; | |
2181 | r = -EINVAL; | |
2182 | if (kvm_sigmask.len != sizeof sigset) | |
2183 | goto out; | |
2184 | r = -EFAULT; | |
2185 | if (copy_from_user(&sigset, sigmask_arg->sigset, | |
2186 | sizeof sigset)) | |
2187 | goto out; | |
2188 | p = &sigset; | |
2189 | } | |
376d41ff | 2190 | r = kvm_vcpu_ioctl_set_sigmask(vcpu, p); |
1961d276 AK |
2191 | break; |
2192 | } | |
b8836737 | 2193 | case KVM_GET_FPU: { |
fa3795a7 DH |
2194 | fpu = kzalloc(sizeof(struct kvm_fpu), GFP_KERNEL); |
2195 | r = -ENOMEM; | |
2196 | if (!fpu) | |
2197 | goto out; | |
2198 | r = kvm_arch_vcpu_ioctl_get_fpu(vcpu, fpu); | |
b8836737 AK |
2199 | if (r) |
2200 | goto out; | |
2201 | r = -EFAULT; | |
fa3795a7 | 2202 | if (copy_to_user(argp, fpu, sizeof(struct kvm_fpu))) |
b8836737 AK |
2203 | goto out; |
2204 | r = 0; | |
2205 | break; | |
2206 | } | |
2207 | case KVM_SET_FPU: { | |
ff5c2c03 SL |
2208 | fpu = memdup_user(argp, sizeof(*fpu)); |
2209 | if (IS_ERR(fpu)) { | |
2210 | r = PTR_ERR(fpu); | |
18595411 | 2211 | fpu = NULL; |
b8836737 | 2212 | goto out; |
ff5c2c03 | 2213 | } |
fa3795a7 | 2214 | r = kvm_arch_vcpu_ioctl_set_fpu(vcpu, fpu); |
b8836737 AK |
2215 | break; |
2216 | } | |
bccf2150 | 2217 | default: |
313a3dc7 | 2218 | r = kvm_arch_vcpu_ioctl(filp, ioctl, arg); |
bccf2150 AK |
2219 | } |
2220 | out: | |
2122ff5e | 2221 | vcpu_put(vcpu); |
fa3795a7 DH |
2222 | kfree(fpu); |
2223 | kfree(kvm_sregs); | |
bccf2150 AK |
2224 | return r; |
2225 | } | |
2226 | ||
1dda606c AG |
2227 | #ifdef CONFIG_COMPAT |
2228 | static long kvm_vcpu_compat_ioctl(struct file *filp, | |
2229 | unsigned int ioctl, unsigned long arg) | |
2230 | { | |
2231 | struct kvm_vcpu *vcpu = filp->private_data; | |
2232 | void __user *argp = compat_ptr(arg); | |
2233 | int r; | |
2234 | ||
2235 | if (vcpu->kvm->mm != current->mm) | |
2236 | return -EIO; | |
2237 | ||
2238 | switch (ioctl) { | |
2239 | case KVM_SET_SIGNAL_MASK: { | |
2240 | struct kvm_signal_mask __user *sigmask_arg = argp; | |
2241 | struct kvm_signal_mask kvm_sigmask; | |
2242 | compat_sigset_t csigset; | |
2243 | sigset_t sigset; | |
2244 | ||
2245 | if (argp) { | |
2246 | r = -EFAULT; | |
2247 | if (copy_from_user(&kvm_sigmask, argp, | |
2248 | sizeof kvm_sigmask)) | |
2249 | goto out; | |
2250 | r = -EINVAL; | |
2251 | if (kvm_sigmask.len != sizeof csigset) | |
2252 | goto out; | |
2253 | r = -EFAULT; | |
2254 | if (copy_from_user(&csigset, sigmask_arg->sigset, | |
2255 | sizeof csigset)) | |
2256 | goto out; | |
760a9a30 AC |
2257 | sigset_from_compat(&sigset, &csigset); |
2258 | r = kvm_vcpu_ioctl_set_sigmask(vcpu, &sigset); | |
2259 | } else | |
2260 | r = kvm_vcpu_ioctl_set_sigmask(vcpu, NULL); | |
1dda606c AG |
2261 | break; |
2262 | } | |
2263 | default: | |
2264 | r = kvm_vcpu_ioctl(filp, ioctl, arg); | |
2265 | } | |
2266 | ||
2267 | out: | |
2268 | return r; | |
2269 | } | |
2270 | #endif | |
2271 | ||
852b6d57 SW |
2272 | static int kvm_device_ioctl_attr(struct kvm_device *dev, |
2273 | int (*accessor)(struct kvm_device *dev, | |
2274 | struct kvm_device_attr *attr), | |
2275 | unsigned long arg) | |
2276 | { | |
2277 | struct kvm_device_attr attr; | |
2278 | ||
2279 | if (!accessor) | |
2280 | return -EPERM; | |
2281 | ||
2282 | if (copy_from_user(&attr, (void __user *)arg, sizeof(attr))) | |
2283 | return -EFAULT; | |
2284 | ||
2285 | return accessor(dev, &attr); | |
2286 | } | |
2287 | ||
2288 | static long kvm_device_ioctl(struct file *filp, unsigned int ioctl, | |
2289 | unsigned long arg) | |
2290 | { | |
2291 | struct kvm_device *dev = filp->private_data; | |
2292 | ||
2293 | switch (ioctl) { | |
2294 | case KVM_SET_DEVICE_ATTR: | |
2295 | return kvm_device_ioctl_attr(dev, dev->ops->set_attr, arg); | |
2296 | case KVM_GET_DEVICE_ATTR: | |
2297 | return kvm_device_ioctl_attr(dev, dev->ops->get_attr, arg); | |
2298 | case KVM_HAS_DEVICE_ATTR: | |
2299 | return kvm_device_ioctl_attr(dev, dev->ops->has_attr, arg); | |
2300 | default: | |
2301 | if (dev->ops->ioctl) | |
2302 | return dev->ops->ioctl(dev, ioctl, arg); | |
2303 | ||
2304 | return -ENOTTY; | |
2305 | } | |
2306 | } | |
2307 | ||
852b6d57 SW |
2308 | static int kvm_device_release(struct inode *inode, struct file *filp) |
2309 | { | |
2310 | struct kvm_device *dev = filp->private_data; | |
2311 | struct kvm *kvm = dev->kvm; | |
2312 | ||
852b6d57 SW |
2313 | kvm_put_kvm(kvm); |
2314 | return 0; | |
2315 | } | |
2316 | ||
2317 | static const struct file_operations kvm_device_fops = { | |
2318 | .unlocked_ioctl = kvm_device_ioctl, | |
db6ae615 SW |
2319 | #ifdef CONFIG_COMPAT |
2320 | .compat_ioctl = kvm_device_ioctl, | |
2321 | #endif | |
852b6d57 SW |
2322 | .release = kvm_device_release, |
2323 | }; | |
2324 | ||
2325 | struct kvm_device *kvm_device_from_filp(struct file *filp) | |
2326 | { | |
2327 | if (filp->f_op != &kvm_device_fops) | |
2328 | return NULL; | |
2329 | ||
2330 | return filp->private_data; | |
2331 | } | |
2332 | ||
d60eacb0 | 2333 | static struct kvm_device_ops *kvm_device_ops_table[KVM_DEV_TYPE_MAX] = { |
5df554ad | 2334 | #ifdef CONFIG_KVM_MPIC |
d60eacb0 WD |
2335 | [KVM_DEV_TYPE_FSL_MPIC_20] = &kvm_mpic_ops, |
2336 | [KVM_DEV_TYPE_FSL_MPIC_42] = &kvm_mpic_ops, | |
5975a2e0 | 2337 | #endif |
d60eacb0 | 2338 | |
5975a2e0 | 2339 | #ifdef CONFIG_KVM_XICS |
d60eacb0 | 2340 | [KVM_DEV_TYPE_XICS] = &kvm_xics_ops, |
ec53500f | 2341 | #endif |
d60eacb0 WD |
2342 | }; |
2343 | ||
2344 | int kvm_register_device_ops(struct kvm_device_ops *ops, u32 type) | |
2345 | { | |
2346 | if (type >= ARRAY_SIZE(kvm_device_ops_table)) | |
2347 | return -ENOSPC; | |
2348 | ||
2349 | if (kvm_device_ops_table[type] != NULL) | |
2350 | return -EEXIST; | |
2351 | ||
2352 | kvm_device_ops_table[type] = ops; | |
2353 | return 0; | |
2354 | } | |
2355 | ||
571ee1b6 WL |
2356 | void kvm_unregister_device_ops(u32 type) |
2357 | { | |
2358 | if (kvm_device_ops_table[type] != NULL) | |
2359 | kvm_device_ops_table[type] = NULL; | |
2360 | } | |
2361 | ||
852b6d57 SW |
2362 | static int kvm_ioctl_create_device(struct kvm *kvm, |
2363 | struct kvm_create_device *cd) | |
2364 | { | |
2365 | struct kvm_device_ops *ops = NULL; | |
2366 | struct kvm_device *dev; | |
2367 | bool test = cd->flags & KVM_CREATE_DEVICE_TEST; | |
2368 | int ret; | |
2369 | ||
d60eacb0 WD |
2370 | if (cd->type >= ARRAY_SIZE(kvm_device_ops_table)) |
2371 | return -ENODEV; | |
2372 | ||
2373 | ops = kvm_device_ops_table[cd->type]; | |
2374 | if (ops == NULL) | |
852b6d57 | 2375 | return -ENODEV; |
852b6d57 SW |
2376 | |
2377 | if (test) | |
2378 | return 0; | |
2379 | ||
2380 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); | |
2381 | if (!dev) | |
2382 | return -ENOMEM; | |
2383 | ||
2384 | dev->ops = ops; | |
2385 | dev->kvm = kvm; | |
852b6d57 SW |
2386 | |
2387 | ret = ops->create(dev, cd->type); | |
2388 | if (ret < 0) { | |
2389 | kfree(dev); | |
2390 | return ret; | |
2391 | } | |
2392 | ||
24009b05 | 2393 | ret = anon_inode_getfd(ops->name, &kvm_device_fops, dev, O_RDWR | O_CLOEXEC); |
852b6d57 SW |
2394 | if (ret < 0) { |
2395 | ops->destroy(dev); | |
2396 | return ret; | |
2397 | } | |
2398 | ||
07f0a7bd | 2399 | list_add(&dev->vm_node, &kvm->devices); |
852b6d57 SW |
2400 | kvm_get_kvm(kvm); |
2401 | cd->fd = ret; | |
2402 | return 0; | |
2403 | } | |
2404 | ||
92b591a4 AG |
2405 | static long kvm_vm_ioctl_check_extension_generic(struct kvm *kvm, long arg) |
2406 | { | |
2407 | switch (arg) { | |
2408 | case KVM_CAP_USER_MEMORY: | |
2409 | case KVM_CAP_DESTROY_MEMORY_REGION_WORKS: | |
2410 | case KVM_CAP_JOIN_MEMORY_REGIONS_WORKS: | |
2411 | #ifdef CONFIG_KVM_APIC_ARCHITECTURE | |
2412 | case KVM_CAP_SET_BOOT_CPU_ID: | |
2413 | #endif | |
2414 | case KVM_CAP_INTERNAL_ERROR_DATA: | |
2415 | #ifdef CONFIG_HAVE_KVM_MSI | |
2416 | case KVM_CAP_SIGNAL_MSI: | |
2417 | #endif | |
297e2105 | 2418 | #ifdef CONFIG_HAVE_KVM_IRQFD |
92b591a4 AG |
2419 | case KVM_CAP_IRQFD_RESAMPLE: |
2420 | #endif | |
2421 | case KVM_CAP_CHECK_EXTENSION_VM: | |
2422 | return 1; | |
2423 | #ifdef CONFIG_HAVE_KVM_IRQ_ROUTING | |
2424 | case KVM_CAP_IRQ_ROUTING: | |
2425 | return KVM_MAX_IRQ_ROUTES; | |
2426 | #endif | |
2427 | default: | |
2428 | break; | |
2429 | } | |
2430 | return kvm_vm_ioctl_check_extension(kvm, arg); | |
2431 | } | |
2432 | ||
bccf2150 AK |
2433 | static long kvm_vm_ioctl(struct file *filp, |
2434 | unsigned int ioctl, unsigned long arg) | |
2435 | { | |
2436 | struct kvm *kvm = filp->private_data; | |
2437 | void __user *argp = (void __user *)arg; | |
1fe779f8 | 2438 | int r; |
bccf2150 | 2439 | |
6d4e4c4f AK |
2440 | if (kvm->mm != current->mm) |
2441 | return -EIO; | |
bccf2150 AK |
2442 | switch (ioctl) { |
2443 | case KVM_CREATE_VCPU: | |
2444 | r = kvm_vm_ioctl_create_vcpu(kvm, arg); | |
bccf2150 | 2445 | break; |
6fc138d2 IE |
2446 | case KVM_SET_USER_MEMORY_REGION: { |
2447 | struct kvm_userspace_memory_region kvm_userspace_mem; | |
2448 | ||
2449 | r = -EFAULT; | |
2450 | if (copy_from_user(&kvm_userspace_mem, argp, | |
2451 | sizeof kvm_userspace_mem)) | |
2452 | goto out; | |
2453 | ||
47ae31e2 | 2454 | r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_userspace_mem); |
6aa8b732 AK |
2455 | break; |
2456 | } | |
2457 | case KVM_GET_DIRTY_LOG: { | |
2458 | struct kvm_dirty_log log; | |
2459 | ||
2460 | r = -EFAULT; | |
2f366987 | 2461 | if (copy_from_user(&log, argp, sizeof log)) |
6aa8b732 | 2462 | goto out; |
2c6f5df9 | 2463 | r = kvm_vm_ioctl_get_dirty_log(kvm, &log); |
6aa8b732 AK |
2464 | break; |
2465 | } | |
5f94c174 LV |
2466 | #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET |
2467 | case KVM_REGISTER_COALESCED_MMIO: { | |
2468 | struct kvm_coalesced_mmio_zone zone; | |
2469 | r = -EFAULT; | |
2470 | if (copy_from_user(&zone, argp, sizeof zone)) | |
2471 | goto out; | |
5f94c174 | 2472 | r = kvm_vm_ioctl_register_coalesced_mmio(kvm, &zone); |
5f94c174 LV |
2473 | break; |
2474 | } | |
2475 | case KVM_UNREGISTER_COALESCED_MMIO: { | |
2476 | struct kvm_coalesced_mmio_zone zone; | |
2477 | r = -EFAULT; | |
2478 | if (copy_from_user(&zone, argp, sizeof zone)) | |
2479 | goto out; | |
5f94c174 | 2480 | r = kvm_vm_ioctl_unregister_coalesced_mmio(kvm, &zone); |
5f94c174 LV |
2481 | break; |
2482 | } | |
2483 | #endif | |
721eecbf GH |
2484 | case KVM_IRQFD: { |
2485 | struct kvm_irqfd data; | |
2486 | ||
2487 | r = -EFAULT; | |
2488 | if (copy_from_user(&data, argp, sizeof data)) | |
2489 | goto out; | |
d4db2935 | 2490 | r = kvm_irqfd(kvm, &data); |
721eecbf GH |
2491 | break; |
2492 | } | |
d34e6b17 GH |
2493 | case KVM_IOEVENTFD: { |
2494 | struct kvm_ioeventfd data; | |
2495 | ||
2496 | r = -EFAULT; | |
2497 | if (copy_from_user(&data, argp, sizeof data)) | |
2498 | goto out; | |
2499 | r = kvm_ioeventfd(kvm, &data); | |
2500 | break; | |
2501 | } | |
73880c80 GN |
2502 | #ifdef CONFIG_KVM_APIC_ARCHITECTURE |
2503 | case KVM_SET_BOOT_CPU_ID: | |
2504 | r = 0; | |
894a9c55 | 2505 | mutex_lock(&kvm->lock); |
73880c80 GN |
2506 | if (atomic_read(&kvm->online_vcpus) != 0) |
2507 | r = -EBUSY; | |
2508 | else | |
2509 | kvm->bsp_vcpu_id = arg; | |
894a9c55 | 2510 | mutex_unlock(&kvm->lock); |
73880c80 | 2511 | break; |
07975ad3 JK |
2512 | #endif |
2513 | #ifdef CONFIG_HAVE_KVM_MSI | |
2514 | case KVM_SIGNAL_MSI: { | |
2515 | struct kvm_msi msi; | |
2516 | ||
2517 | r = -EFAULT; | |
2518 | if (copy_from_user(&msi, argp, sizeof msi)) | |
2519 | goto out; | |
2520 | r = kvm_send_userspace_msi(kvm, &msi); | |
2521 | break; | |
2522 | } | |
23d43cf9 CD |
2523 | #endif |
2524 | #ifdef __KVM_HAVE_IRQ_LINE | |
2525 | case KVM_IRQ_LINE_STATUS: | |
2526 | case KVM_IRQ_LINE: { | |
2527 | struct kvm_irq_level irq_event; | |
2528 | ||
2529 | r = -EFAULT; | |
2530 | if (copy_from_user(&irq_event, argp, sizeof irq_event)) | |
2531 | goto out; | |
2532 | ||
aa2fbe6d YZ |
2533 | r = kvm_vm_ioctl_irq_line(kvm, &irq_event, |
2534 | ioctl == KVM_IRQ_LINE_STATUS); | |
23d43cf9 CD |
2535 | if (r) |
2536 | goto out; | |
2537 | ||
2538 | r = -EFAULT; | |
2539 | if (ioctl == KVM_IRQ_LINE_STATUS) { | |
2540 | if (copy_to_user(argp, &irq_event, sizeof irq_event)) | |
2541 | goto out; | |
2542 | } | |
2543 | ||
2544 | r = 0; | |
2545 | break; | |
2546 | } | |
73880c80 | 2547 | #endif |
aa8d5944 AG |
2548 | #ifdef CONFIG_HAVE_KVM_IRQ_ROUTING |
2549 | case KVM_SET_GSI_ROUTING: { | |
2550 | struct kvm_irq_routing routing; | |
2551 | struct kvm_irq_routing __user *urouting; | |
2552 | struct kvm_irq_routing_entry *entries; | |
2553 | ||
2554 | r = -EFAULT; | |
2555 | if (copy_from_user(&routing, argp, sizeof(routing))) | |
2556 | goto out; | |
2557 | r = -EINVAL; | |
2558 | if (routing.nr >= KVM_MAX_IRQ_ROUTES) | |
2559 | goto out; | |
2560 | if (routing.flags) | |
2561 | goto out; | |
2562 | r = -ENOMEM; | |
2563 | entries = vmalloc(routing.nr * sizeof(*entries)); | |
2564 | if (!entries) | |
2565 | goto out; | |
2566 | r = -EFAULT; | |
2567 | urouting = argp; | |
2568 | if (copy_from_user(entries, urouting->entries, | |
2569 | routing.nr * sizeof(*entries))) | |
2570 | goto out_free_irq_routing; | |
2571 | r = kvm_set_irq_routing(kvm, entries, routing.nr, | |
2572 | routing.flags); | |
2573 | out_free_irq_routing: | |
2574 | vfree(entries); | |
2575 | break; | |
2576 | } | |
2577 | #endif /* CONFIG_HAVE_KVM_IRQ_ROUTING */ | |
852b6d57 SW |
2578 | case KVM_CREATE_DEVICE: { |
2579 | struct kvm_create_device cd; | |
2580 | ||
2581 | r = -EFAULT; | |
2582 | if (copy_from_user(&cd, argp, sizeof(cd))) | |
2583 | goto out; | |
2584 | ||
2585 | r = kvm_ioctl_create_device(kvm, &cd); | |
2586 | if (r) | |
2587 | goto out; | |
2588 | ||
2589 | r = -EFAULT; | |
2590 | if (copy_to_user(argp, &cd, sizeof(cd))) | |
2591 | goto out; | |
2592 | ||
2593 | r = 0; | |
2594 | break; | |
2595 | } | |
92b591a4 AG |
2596 | case KVM_CHECK_EXTENSION: |
2597 | r = kvm_vm_ioctl_check_extension_generic(kvm, arg); | |
2598 | break; | |
f17abe9a | 2599 | default: |
1fe779f8 | 2600 | r = kvm_arch_vm_ioctl(filp, ioctl, arg); |
f17abe9a AK |
2601 | } |
2602 | out: | |
2603 | return r; | |
2604 | } | |
2605 | ||
6ff5894c AB |
2606 | #ifdef CONFIG_COMPAT |
2607 | struct compat_kvm_dirty_log { | |
2608 | __u32 slot; | |
2609 | __u32 padding1; | |
2610 | union { | |
2611 | compat_uptr_t dirty_bitmap; /* one bit per page */ | |
2612 | __u64 padding2; | |
2613 | }; | |
2614 | }; | |
2615 | ||
2616 | static long kvm_vm_compat_ioctl(struct file *filp, | |
2617 | unsigned int ioctl, unsigned long arg) | |
2618 | { | |
2619 | struct kvm *kvm = filp->private_data; | |
2620 | int r; | |
2621 | ||
2622 | if (kvm->mm != current->mm) | |
2623 | return -EIO; | |
2624 | switch (ioctl) { | |
2625 | case KVM_GET_DIRTY_LOG: { | |
2626 | struct compat_kvm_dirty_log compat_log; | |
2627 | struct kvm_dirty_log log; | |
2628 | ||
2629 | r = -EFAULT; | |
2630 | if (copy_from_user(&compat_log, (void __user *)arg, | |
2631 | sizeof(compat_log))) | |
2632 | goto out; | |
2633 | log.slot = compat_log.slot; | |
2634 | log.padding1 = compat_log.padding1; | |
2635 | log.padding2 = compat_log.padding2; | |
2636 | log.dirty_bitmap = compat_ptr(compat_log.dirty_bitmap); | |
2637 | ||
2638 | r = kvm_vm_ioctl_get_dirty_log(kvm, &log); | |
6ff5894c AB |
2639 | break; |
2640 | } | |
2641 | default: | |
2642 | r = kvm_vm_ioctl(filp, ioctl, arg); | |
2643 | } | |
2644 | ||
2645 | out: | |
2646 | return r; | |
2647 | } | |
2648 | #endif | |
2649 | ||
3d3aab1b | 2650 | static struct file_operations kvm_vm_fops = { |
f17abe9a AK |
2651 | .release = kvm_vm_release, |
2652 | .unlocked_ioctl = kvm_vm_ioctl, | |
6ff5894c AB |
2653 | #ifdef CONFIG_COMPAT |
2654 | .compat_ioctl = kvm_vm_compat_ioctl, | |
2655 | #endif | |
6038f373 | 2656 | .llseek = noop_llseek, |
f17abe9a AK |
2657 | }; |
2658 | ||
e08b9637 | 2659 | static int kvm_dev_ioctl_create_vm(unsigned long type) |
f17abe9a | 2660 | { |
aac87636 | 2661 | int r; |
f17abe9a AK |
2662 | struct kvm *kvm; |
2663 | ||
e08b9637 | 2664 | kvm = kvm_create_vm(type); |
d6d28168 AK |
2665 | if (IS_ERR(kvm)) |
2666 | return PTR_ERR(kvm); | |
6ce5a090 TY |
2667 | #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET |
2668 | r = kvm_coalesced_mmio_init(kvm); | |
2669 | if (r < 0) { | |
2670 | kvm_put_kvm(kvm); | |
2671 | return r; | |
2672 | } | |
2673 | #endif | |
24009b05 | 2674 | r = anon_inode_getfd("kvm-vm", &kvm_vm_fops, kvm, O_RDWR | O_CLOEXEC); |
aac87636 | 2675 | if (r < 0) |
66c0b394 | 2676 | kvm_put_kvm(kvm); |
f17abe9a | 2677 | |
aac87636 | 2678 | return r; |
f17abe9a AK |
2679 | } |
2680 | ||
2681 | static long kvm_dev_ioctl(struct file *filp, | |
2682 | unsigned int ioctl, unsigned long arg) | |
2683 | { | |
07c45a36 | 2684 | long r = -EINVAL; |
f17abe9a AK |
2685 | |
2686 | switch (ioctl) { | |
2687 | case KVM_GET_API_VERSION: | |
f0fe5108 AK |
2688 | if (arg) |
2689 | goto out; | |
f17abe9a AK |
2690 | r = KVM_API_VERSION; |
2691 | break; | |
2692 | case KVM_CREATE_VM: | |
e08b9637 | 2693 | r = kvm_dev_ioctl_create_vm(arg); |
f17abe9a | 2694 | break; |
018d00d2 | 2695 | case KVM_CHECK_EXTENSION: |
784aa3d7 | 2696 | r = kvm_vm_ioctl_check_extension_generic(NULL, arg); |
5d308f45 | 2697 | break; |
07c45a36 | 2698 | case KVM_GET_VCPU_MMAP_SIZE: |
07c45a36 AK |
2699 | if (arg) |
2700 | goto out; | |
adb1ff46 AK |
2701 | r = PAGE_SIZE; /* struct kvm_run */ |
2702 | #ifdef CONFIG_X86 | |
2703 | r += PAGE_SIZE; /* pio data page */ | |
5f94c174 LV |
2704 | #endif |
2705 | #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET | |
2706 | r += PAGE_SIZE; /* coalesced mmio ring page */ | |
adb1ff46 | 2707 | #endif |
07c45a36 | 2708 | break; |
d4c9ff2d FEL |
2709 | case KVM_TRACE_ENABLE: |
2710 | case KVM_TRACE_PAUSE: | |
2711 | case KVM_TRACE_DISABLE: | |
2023a29c | 2712 | r = -EOPNOTSUPP; |
d4c9ff2d | 2713 | break; |
6aa8b732 | 2714 | default: |
043405e1 | 2715 | return kvm_arch_dev_ioctl(filp, ioctl, arg); |
6aa8b732 AK |
2716 | } |
2717 | out: | |
2718 | return r; | |
2719 | } | |
2720 | ||
6aa8b732 | 2721 | static struct file_operations kvm_chardev_ops = { |
6aa8b732 AK |
2722 | .unlocked_ioctl = kvm_dev_ioctl, |
2723 | .compat_ioctl = kvm_dev_ioctl, | |
6038f373 | 2724 | .llseek = noop_llseek, |
6aa8b732 AK |
2725 | }; |
2726 | ||
2727 | static struct miscdevice kvm_dev = { | |
bbe4432e | 2728 | KVM_MINOR, |
6aa8b732 AK |
2729 | "kvm", |
2730 | &kvm_chardev_ops, | |
2731 | }; | |
2732 | ||
75b7127c | 2733 | static void hardware_enable_nolock(void *junk) |
1b6c0168 AK |
2734 | { |
2735 | int cpu = raw_smp_processor_id(); | |
10474ae8 | 2736 | int r; |
1b6c0168 | 2737 | |
7f59f492 | 2738 | if (cpumask_test_cpu(cpu, cpus_hardware_enabled)) |
1b6c0168 | 2739 | return; |
10474ae8 | 2740 | |
7f59f492 | 2741 | cpumask_set_cpu(cpu, cpus_hardware_enabled); |
10474ae8 | 2742 | |
13a34e06 | 2743 | r = kvm_arch_hardware_enable(); |
10474ae8 AG |
2744 | |
2745 | if (r) { | |
2746 | cpumask_clear_cpu(cpu, cpus_hardware_enabled); | |
2747 | atomic_inc(&hardware_enable_failed); | |
2748 | printk(KERN_INFO "kvm: enabling virtualization on " | |
2749 | "CPU%d failed\n", cpu); | |
2750 | } | |
1b6c0168 AK |
2751 | } |
2752 | ||
4fa92fb2 | 2753 | static void hardware_enable(void) |
75b7127c | 2754 | { |
4a937f96 | 2755 | raw_spin_lock(&kvm_count_lock); |
4fa92fb2 PB |
2756 | if (kvm_usage_count) |
2757 | hardware_enable_nolock(NULL); | |
4a937f96 | 2758 | raw_spin_unlock(&kvm_count_lock); |
75b7127c TY |
2759 | } |
2760 | ||
2761 | static void hardware_disable_nolock(void *junk) | |
1b6c0168 AK |
2762 | { |
2763 | int cpu = raw_smp_processor_id(); | |
2764 | ||
7f59f492 | 2765 | if (!cpumask_test_cpu(cpu, cpus_hardware_enabled)) |
1b6c0168 | 2766 | return; |
7f59f492 | 2767 | cpumask_clear_cpu(cpu, cpus_hardware_enabled); |
13a34e06 | 2768 | kvm_arch_hardware_disable(); |
1b6c0168 AK |
2769 | } |
2770 | ||
4fa92fb2 | 2771 | static void hardware_disable(void) |
75b7127c | 2772 | { |
4a937f96 | 2773 | raw_spin_lock(&kvm_count_lock); |
4fa92fb2 PB |
2774 | if (kvm_usage_count) |
2775 | hardware_disable_nolock(NULL); | |
4a937f96 | 2776 | raw_spin_unlock(&kvm_count_lock); |
75b7127c TY |
2777 | } |
2778 | ||
10474ae8 AG |
2779 | static void hardware_disable_all_nolock(void) |
2780 | { | |
2781 | BUG_ON(!kvm_usage_count); | |
2782 | ||
2783 | kvm_usage_count--; | |
2784 | if (!kvm_usage_count) | |
75b7127c | 2785 | on_each_cpu(hardware_disable_nolock, NULL, 1); |
10474ae8 AG |
2786 | } |
2787 | ||
2788 | static void hardware_disable_all(void) | |
2789 | { | |
4a937f96 | 2790 | raw_spin_lock(&kvm_count_lock); |
10474ae8 | 2791 | hardware_disable_all_nolock(); |
4a937f96 | 2792 | raw_spin_unlock(&kvm_count_lock); |
10474ae8 AG |
2793 | } |
2794 | ||
2795 | static int hardware_enable_all(void) | |
2796 | { | |
2797 | int r = 0; | |
2798 | ||
4a937f96 | 2799 | raw_spin_lock(&kvm_count_lock); |
10474ae8 AG |
2800 | |
2801 | kvm_usage_count++; | |
2802 | if (kvm_usage_count == 1) { | |
2803 | atomic_set(&hardware_enable_failed, 0); | |
75b7127c | 2804 | on_each_cpu(hardware_enable_nolock, NULL, 1); |
10474ae8 AG |
2805 | |
2806 | if (atomic_read(&hardware_enable_failed)) { | |
2807 | hardware_disable_all_nolock(); | |
2808 | r = -EBUSY; | |
2809 | } | |
2810 | } | |
2811 | ||
4a937f96 | 2812 | raw_spin_unlock(&kvm_count_lock); |
10474ae8 AG |
2813 | |
2814 | return r; | |
2815 | } | |
2816 | ||
774c47f1 AK |
2817 | static int kvm_cpu_hotplug(struct notifier_block *notifier, unsigned long val, |
2818 | void *v) | |
2819 | { | |
2820 | int cpu = (long)v; | |
2821 | ||
1a6f4d7f | 2822 | val &= ~CPU_TASKS_FROZEN; |
774c47f1 | 2823 | switch (val) { |
cec9ad27 | 2824 | case CPU_DYING: |
6ec8a856 AK |
2825 | printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n", |
2826 | cpu); | |
4fa92fb2 | 2827 | hardware_disable(); |
6ec8a856 | 2828 | break; |
da908f2f | 2829 | case CPU_STARTING: |
43934a38 JK |
2830 | printk(KERN_INFO "kvm: enabling virtualization on CPU%d\n", |
2831 | cpu); | |
4fa92fb2 | 2832 | hardware_enable(); |
774c47f1 AK |
2833 | break; |
2834 | } | |
2835 | return NOTIFY_OK; | |
2836 | } | |
2837 | ||
9a2b85c6 | 2838 | static int kvm_reboot(struct notifier_block *notifier, unsigned long val, |
d77c26fc | 2839 | void *v) |
9a2b85c6 | 2840 | { |
8e1c1815 SY |
2841 | /* |
2842 | * Some (well, at least mine) BIOSes hang on reboot if | |
2843 | * in vmx root mode. | |
2844 | * | |
2845 | * And Intel TXT required VMX off for all cpu when system shutdown. | |
2846 | */ | |
2847 | printk(KERN_INFO "kvm: exiting hardware virtualization\n"); | |
2848 | kvm_rebooting = true; | |
75b7127c | 2849 | on_each_cpu(hardware_disable_nolock, NULL, 1); |
9a2b85c6 RR |
2850 | return NOTIFY_OK; |
2851 | } | |
2852 | ||
2853 | static struct notifier_block kvm_reboot_notifier = { | |
2854 | .notifier_call = kvm_reboot, | |
2855 | .priority = 0, | |
2856 | }; | |
2857 | ||
e93f8a0f | 2858 | static void kvm_io_bus_destroy(struct kvm_io_bus *bus) |
2eeb2e94 GH |
2859 | { |
2860 | int i; | |
2861 | ||
2862 | for (i = 0; i < bus->dev_count; i++) { | |
743eeb0b | 2863 | struct kvm_io_device *pos = bus->range[i].dev; |
2eeb2e94 GH |
2864 | |
2865 | kvm_iodevice_destructor(pos); | |
2866 | } | |
e93f8a0f | 2867 | kfree(bus); |
2eeb2e94 GH |
2868 | } |
2869 | ||
c21fbff1 PB |
2870 | static inline int kvm_io_bus_cmp(const struct kvm_io_range *r1, |
2871 | const struct kvm_io_range *r2) | |
743eeb0b | 2872 | { |
743eeb0b SL |
2873 | if (r1->addr < r2->addr) |
2874 | return -1; | |
2875 | if (r1->addr + r1->len > r2->addr + r2->len) | |
2876 | return 1; | |
2877 | return 0; | |
2878 | } | |
2879 | ||
a343c9b7 PB |
2880 | static int kvm_io_bus_sort_cmp(const void *p1, const void *p2) |
2881 | { | |
c21fbff1 | 2882 | return kvm_io_bus_cmp(p1, p2); |
a343c9b7 PB |
2883 | } |
2884 | ||
39369f7a | 2885 | static int kvm_io_bus_insert_dev(struct kvm_io_bus *bus, struct kvm_io_device *dev, |
743eeb0b SL |
2886 | gpa_t addr, int len) |
2887 | { | |
743eeb0b SL |
2888 | bus->range[bus->dev_count++] = (struct kvm_io_range) { |
2889 | .addr = addr, | |
2890 | .len = len, | |
2891 | .dev = dev, | |
2892 | }; | |
2893 | ||
2894 | sort(bus->range, bus->dev_count, sizeof(struct kvm_io_range), | |
2895 | kvm_io_bus_sort_cmp, NULL); | |
2896 | ||
2897 | return 0; | |
2898 | } | |
2899 | ||
39369f7a | 2900 | static int kvm_io_bus_get_first_dev(struct kvm_io_bus *bus, |
743eeb0b SL |
2901 | gpa_t addr, int len) |
2902 | { | |
2903 | struct kvm_io_range *range, key; | |
2904 | int off; | |
2905 | ||
2906 | key = (struct kvm_io_range) { | |
2907 | .addr = addr, | |
2908 | .len = len, | |
2909 | }; | |
2910 | ||
2911 | range = bsearch(&key, bus->range, bus->dev_count, | |
2912 | sizeof(struct kvm_io_range), kvm_io_bus_sort_cmp); | |
2913 | if (range == NULL) | |
2914 | return -ENOENT; | |
2915 | ||
2916 | off = range - bus->range; | |
2917 | ||
c21fbff1 | 2918 | while (off > 0 && kvm_io_bus_cmp(&key, &bus->range[off-1]) == 0) |
743eeb0b SL |
2919 | off--; |
2920 | ||
2921 | return off; | |
2922 | } | |
2923 | ||
126a5af5 CH |
2924 | static int __kvm_io_bus_write(struct kvm_io_bus *bus, |
2925 | struct kvm_io_range *range, const void *val) | |
2926 | { | |
2927 | int idx; | |
2928 | ||
2929 | idx = kvm_io_bus_get_first_dev(bus, range->addr, range->len); | |
2930 | if (idx < 0) | |
2931 | return -EOPNOTSUPP; | |
2932 | ||
2933 | while (idx < bus->dev_count && | |
c21fbff1 | 2934 | kvm_io_bus_cmp(range, &bus->range[idx]) == 0) { |
126a5af5 CH |
2935 | if (!kvm_iodevice_write(bus->range[idx].dev, range->addr, |
2936 | range->len, val)) | |
2937 | return idx; | |
2938 | idx++; | |
2939 | } | |
2940 | ||
2941 | return -EOPNOTSUPP; | |
2942 | } | |
2943 | ||
bda9020e | 2944 | /* kvm_io_bus_write - called under kvm->slots_lock */ |
e93f8a0f | 2945 | int kvm_io_bus_write(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr, |
bda9020e | 2946 | int len, const void *val) |
2eeb2e94 | 2947 | { |
90d83dc3 | 2948 | struct kvm_io_bus *bus; |
743eeb0b | 2949 | struct kvm_io_range range; |
126a5af5 | 2950 | int r; |
743eeb0b SL |
2951 | |
2952 | range = (struct kvm_io_range) { | |
2953 | .addr = addr, | |
2954 | .len = len, | |
2955 | }; | |
90d83dc3 LJ |
2956 | |
2957 | bus = srcu_dereference(kvm->buses[bus_idx], &kvm->srcu); | |
126a5af5 CH |
2958 | r = __kvm_io_bus_write(bus, &range, val); |
2959 | return r < 0 ? r : 0; | |
2960 | } | |
2961 | ||
2962 | /* kvm_io_bus_write_cookie - called under kvm->slots_lock */ | |
2963 | int kvm_io_bus_write_cookie(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr, | |
2964 | int len, const void *val, long cookie) | |
2965 | { | |
2966 | struct kvm_io_bus *bus; | |
2967 | struct kvm_io_range range; | |
2968 | ||
2969 | range = (struct kvm_io_range) { | |
2970 | .addr = addr, | |
2971 | .len = len, | |
2972 | }; | |
2973 | ||
2974 | bus = srcu_dereference(kvm->buses[bus_idx], &kvm->srcu); | |
2975 | ||
2976 | /* First try the device referenced by cookie. */ | |
2977 | if ((cookie >= 0) && (cookie < bus->dev_count) && | |
c21fbff1 | 2978 | (kvm_io_bus_cmp(&range, &bus->range[cookie]) == 0)) |
126a5af5 CH |
2979 | if (!kvm_iodevice_write(bus->range[cookie].dev, addr, len, |
2980 | val)) | |
2981 | return cookie; | |
2982 | ||
2983 | /* | |
2984 | * cookie contained garbage; fall back to search and return the | |
2985 | * correct cookie value. | |
2986 | */ | |
2987 | return __kvm_io_bus_write(bus, &range, val); | |
2988 | } | |
2989 | ||
2990 | static int __kvm_io_bus_read(struct kvm_io_bus *bus, struct kvm_io_range *range, | |
2991 | void *val) | |
2992 | { | |
2993 | int idx; | |
2994 | ||
2995 | idx = kvm_io_bus_get_first_dev(bus, range->addr, range->len); | |
743eeb0b SL |
2996 | if (idx < 0) |
2997 | return -EOPNOTSUPP; | |
2998 | ||
2999 | while (idx < bus->dev_count && | |
c21fbff1 | 3000 | kvm_io_bus_cmp(range, &bus->range[idx]) == 0) { |
126a5af5 CH |
3001 | if (!kvm_iodevice_read(bus->range[idx].dev, range->addr, |
3002 | range->len, val)) | |
3003 | return idx; | |
743eeb0b SL |
3004 | idx++; |
3005 | } | |
3006 | ||
bda9020e MT |
3007 | return -EOPNOTSUPP; |
3008 | } | |
68c3b4d1 | 3009 | EXPORT_SYMBOL_GPL(kvm_io_bus_write); |
2eeb2e94 | 3010 | |
bda9020e | 3011 | /* kvm_io_bus_read - called under kvm->slots_lock */ |
e93f8a0f MT |
3012 | int kvm_io_bus_read(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr, |
3013 | int len, void *val) | |
bda9020e | 3014 | { |
90d83dc3 | 3015 | struct kvm_io_bus *bus; |
743eeb0b | 3016 | struct kvm_io_range range; |
126a5af5 | 3017 | int r; |
743eeb0b SL |
3018 | |
3019 | range = (struct kvm_io_range) { | |
3020 | .addr = addr, | |
3021 | .len = len, | |
3022 | }; | |
e93f8a0f | 3023 | |
90d83dc3 | 3024 | bus = srcu_dereference(kvm->buses[bus_idx], &kvm->srcu); |
126a5af5 CH |
3025 | r = __kvm_io_bus_read(bus, &range, val); |
3026 | return r < 0 ? r : 0; | |
3027 | } | |
743eeb0b | 3028 | |
2eeb2e94 | 3029 | |
79fac95e | 3030 | /* Caller must hold slots_lock. */ |
743eeb0b SL |
3031 | int kvm_io_bus_register_dev(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr, |
3032 | int len, struct kvm_io_device *dev) | |
6c474694 | 3033 | { |
e93f8a0f | 3034 | struct kvm_io_bus *new_bus, *bus; |
090b7aff | 3035 | |
e93f8a0f | 3036 | bus = kvm->buses[bus_idx]; |
6ea34c9b AK |
3037 | /* exclude ioeventfd which is limited by maximum fd */ |
3038 | if (bus->dev_count - bus->ioeventfd_count > NR_IOBUS_DEVS - 1) | |
090b7aff | 3039 | return -ENOSPC; |
2eeb2e94 | 3040 | |
a1300716 AK |
3041 | new_bus = kzalloc(sizeof(*bus) + ((bus->dev_count + 1) * |
3042 | sizeof(struct kvm_io_range)), GFP_KERNEL); | |
e93f8a0f MT |
3043 | if (!new_bus) |
3044 | return -ENOMEM; | |
a1300716 AK |
3045 | memcpy(new_bus, bus, sizeof(*bus) + (bus->dev_count * |
3046 | sizeof(struct kvm_io_range))); | |
743eeb0b | 3047 | kvm_io_bus_insert_dev(new_bus, dev, addr, len); |
e93f8a0f MT |
3048 | rcu_assign_pointer(kvm->buses[bus_idx], new_bus); |
3049 | synchronize_srcu_expedited(&kvm->srcu); | |
3050 | kfree(bus); | |
090b7aff GH |
3051 | |
3052 | return 0; | |
3053 | } | |
3054 | ||
79fac95e | 3055 | /* Caller must hold slots_lock. */ |
e93f8a0f MT |
3056 | int kvm_io_bus_unregister_dev(struct kvm *kvm, enum kvm_bus bus_idx, |
3057 | struct kvm_io_device *dev) | |
090b7aff | 3058 | { |
e93f8a0f MT |
3059 | int i, r; |
3060 | struct kvm_io_bus *new_bus, *bus; | |
090b7aff | 3061 | |
cdfca7b3 | 3062 | bus = kvm->buses[bus_idx]; |
e93f8a0f | 3063 | r = -ENOENT; |
a1300716 AK |
3064 | for (i = 0; i < bus->dev_count; i++) |
3065 | if (bus->range[i].dev == dev) { | |
e93f8a0f | 3066 | r = 0; |
090b7aff GH |
3067 | break; |
3068 | } | |
e93f8a0f | 3069 | |
a1300716 | 3070 | if (r) |
e93f8a0f | 3071 | return r; |
a1300716 AK |
3072 | |
3073 | new_bus = kzalloc(sizeof(*bus) + ((bus->dev_count - 1) * | |
3074 | sizeof(struct kvm_io_range)), GFP_KERNEL); | |
3075 | if (!new_bus) | |
3076 | return -ENOMEM; | |
3077 | ||
3078 | memcpy(new_bus, bus, sizeof(*bus) + i * sizeof(struct kvm_io_range)); | |
3079 | new_bus->dev_count--; | |
3080 | memcpy(new_bus->range + i, bus->range + i + 1, | |
3081 | (new_bus->dev_count - i) * sizeof(struct kvm_io_range)); | |
e93f8a0f MT |
3082 | |
3083 | rcu_assign_pointer(kvm->buses[bus_idx], new_bus); | |
3084 | synchronize_srcu_expedited(&kvm->srcu); | |
3085 | kfree(bus); | |
3086 | return r; | |
2eeb2e94 GH |
3087 | } |
3088 | ||
774c47f1 AK |
3089 | static struct notifier_block kvm_cpu_notifier = { |
3090 | .notifier_call = kvm_cpu_hotplug, | |
774c47f1 AK |
3091 | }; |
3092 | ||
8b88b099 | 3093 | static int vm_stat_get(void *_offset, u64 *val) |
ba1389b7 AK |
3094 | { |
3095 | unsigned offset = (long)_offset; | |
ba1389b7 AK |
3096 | struct kvm *kvm; |
3097 | ||
8b88b099 | 3098 | *val = 0; |
2f303b74 | 3099 | spin_lock(&kvm_lock); |
ba1389b7 | 3100 | list_for_each_entry(kvm, &vm_list, vm_list) |
8b88b099 | 3101 | *val += *(u32 *)((void *)kvm + offset); |
2f303b74 | 3102 | spin_unlock(&kvm_lock); |
8b88b099 | 3103 | return 0; |
ba1389b7 AK |
3104 | } |
3105 | ||
3106 | DEFINE_SIMPLE_ATTRIBUTE(vm_stat_fops, vm_stat_get, NULL, "%llu\n"); | |
3107 | ||
8b88b099 | 3108 | static int vcpu_stat_get(void *_offset, u64 *val) |
1165f5fe AK |
3109 | { |
3110 | unsigned offset = (long)_offset; | |
1165f5fe AK |
3111 | struct kvm *kvm; |
3112 | struct kvm_vcpu *vcpu; | |
3113 | int i; | |
3114 | ||
8b88b099 | 3115 | *val = 0; |
2f303b74 | 3116 | spin_lock(&kvm_lock); |
1165f5fe | 3117 | list_for_each_entry(kvm, &vm_list, vm_list) |
988a2cae GN |
3118 | kvm_for_each_vcpu(i, vcpu, kvm) |
3119 | *val += *(u32 *)((void *)vcpu + offset); | |
3120 | ||
2f303b74 | 3121 | spin_unlock(&kvm_lock); |
8b88b099 | 3122 | return 0; |
1165f5fe AK |
3123 | } |
3124 | ||
ba1389b7 AK |
3125 | DEFINE_SIMPLE_ATTRIBUTE(vcpu_stat_fops, vcpu_stat_get, NULL, "%llu\n"); |
3126 | ||
828c0950 | 3127 | static const struct file_operations *stat_fops[] = { |
ba1389b7 AK |
3128 | [KVM_STAT_VCPU] = &vcpu_stat_fops, |
3129 | [KVM_STAT_VM] = &vm_stat_fops, | |
3130 | }; | |
1165f5fe | 3131 | |
4f69b680 | 3132 | static int kvm_init_debug(void) |
6aa8b732 | 3133 | { |
0c8eb04a | 3134 | int r = -EEXIST; |
6aa8b732 AK |
3135 | struct kvm_stats_debugfs_item *p; |
3136 | ||
76f7c879 | 3137 | kvm_debugfs_dir = debugfs_create_dir("kvm", NULL); |
4f69b680 H |
3138 | if (kvm_debugfs_dir == NULL) |
3139 | goto out; | |
3140 | ||
3141 | for (p = debugfs_entries; p->name; ++p) { | |
76f7c879 | 3142 | p->dentry = debugfs_create_file(p->name, 0444, kvm_debugfs_dir, |
1165f5fe | 3143 | (void *)(long)p->offset, |
ba1389b7 | 3144 | stat_fops[p->kind]); |
4f69b680 H |
3145 | if (p->dentry == NULL) |
3146 | goto out_dir; | |
3147 | } | |
3148 | ||
3149 | return 0; | |
3150 | ||
3151 | out_dir: | |
3152 | debugfs_remove_recursive(kvm_debugfs_dir); | |
3153 | out: | |
3154 | return r; | |
6aa8b732 AK |
3155 | } |
3156 | ||
3157 | static void kvm_exit_debug(void) | |
3158 | { | |
3159 | struct kvm_stats_debugfs_item *p; | |
3160 | ||
3161 | for (p = debugfs_entries; p->name; ++p) | |
3162 | debugfs_remove(p->dentry); | |
76f7c879 | 3163 | debugfs_remove(kvm_debugfs_dir); |
6aa8b732 AK |
3164 | } |
3165 | ||
fb3600cc | 3166 | static int kvm_suspend(void) |
59ae6c6b | 3167 | { |
10474ae8 | 3168 | if (kvm_usage_count) |
75b7127c | 3169 | hardware_disable_nolock(NULL); |
59ae6c6b AK |
3170 | return 0; |
3171 | } | |
3172 | ||
fb3600cc | 3173 | static void kvm_resume(void) |
59ae6c6b | 3174 | { |
ca84d1a2 | 3175 | if (kvm_usage_count) { |
4a937f96 | 3176 | WARN_ON(raw_spin_is_locked(&kvm_count_lock)); |
75b7127c | 3177 | hardware_enable_nolock(NULL); |
ca84d1a2 | 3178 | } |
59ae6c6b AK |
3179 | } |
3180 | ||
fb3600cc | 3181 | static struct syscore_ops kvm_syscore_ops = { |
59ae6c6b AK |
3182 | .suspend = kvm_suspend, |
3183 | .resume = kvm_resume, | |
3184 | }; | |
3185 | ||
15ad7146 AK |
3186 | static inline |
3187 | struct kvm_vcpu *preempt_notifier_to_vcpu(struct preempt_notifier *pn) | |
3188 | { | |
3189 | return container_of(pn, struct kvm_vcpu, preempt_notifier); | |
3190 | } | |
3191 | ||
3192 | static void kvm_sched_in(struct preempt_notifier *pn, int cpu) | |
3193 | { | |
3194 | struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn); | |
3a08a8f9 R |
3195 | if (vcpu->preempted) |
3196 | vcpu->preempted = false; | |
15ad7146 | 3197 | |
e790d9ef RK |
3198 | kvm_arch_sched_in(vcpu, cpu); |
3199 | ||
e9b11c17 | 3200 | kvm_arch_vcpu_load(vcpu, cpu); |
15ad7146 AK |
3201 | } |
3202 | ||
3203 | static void kvm_sched_out(struct preempt_notifier *pn, | |
3204 | struct task_struct *next) | |
3205 | { | |
3206 | struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn); | |
3207 | ||
3a08a8f9 R |
3208 | if (current->state == TASK_RUNNING) |
3209 | vcpu->preempted = true; | |
e9b11c17 | 3210 | kvm_arch_vcpu_put(vcpu); |
15ad7146 AK |
3211 | } |
3212 | ||
0ee75bea | 3213 | int kvm_init(void *opaque, unsigned vcpu_size, unsigned vcpu_align, |
c16f862d | 3214 | struct module *module) |
6aa8b732 AK |
3215 | { |
3216 | int r; | |
002c7f7c | 3217 | int cpu; |
6aa8b732 | 3218 | |
f8c16bba ZX |
3219 | r = kvm_arch_init(opaque); |
3220 | if (r) | |
d2308784 | 3221 | goto out_fail; |
cb498ea2 | 3222 | |
7dac16c3 AH |
3223 | /* |
3224 | * kvm_arch_init makes sure there's at most one caller | |
3225 | * for architectures that support multiple implementations, | |
3226 | * like intel and amd on x86. | |
3227 | * kvm_arch_init must be called before kvm_irqfd_init to avoid creating | |
3228 | * conflicts in case kvm is already setup for another implementation. | |
3229 | */ | |
3230 | r = kvm_irqfd_init(); | |
3231 | if (r) | |
3232 | goto out_irqfd; | |
3233 | ||
8437a617 | 3234 | if (!zalloc_cpumask_var(&cpus_hardware_enabled, GFP_KERNEL)) { |
7f59f492 RR |
3235 | r = -ENOMEM; |
3236 | goto out_free_0; | |
3237 | } | |
3238 | ||
e9b11c17 | 3239 | r = kvm_arch_hardware_setup(); |
6aa8b732 | 3240 | if (r < 0) |
7f59f492 | 3241 | goto out_free_0a; |
6aa8b732 | 3242 | |
002c7f7c YS |
3243 | for_each_online_cpu(cpu) { |
3244 | smp_call_function_single(cpu, | |
e9b11c17 | 3245 | kvm_arch_check_processor_compat, |
8691e5a8 | 3246 | &r, 1); |
002c7f7c | 3247 | if (r < 0) |
d2308784 | 3248 | goto out_free_1; |
002c7f7c YS |
3249 | } |
3250 | ||
774c47f1 AK |
3251 | r = register_cpu_notifier(&kvm_cpu_notifier); |
3252 | if (r) | |
d2308784 | 3253 | goto out_free_2; |
6aa8b732 AK |
3254 | register_reboot_notifier(&kvm_reboot_notifier); |
3255 | ||
c16f862d | 3256 | /* A kmem cache lets us meet the alignment requirements of fx_save. */ |
0ee75bea AK |
3257 | if (!vcpu_align) |
3258 | vcpu_align = __alignof__(struct kvm_vcpu); | |
3259 | kvm_vcpu_cache = kmem_cache_create("kvm_vcpu", vcpu_size, vcpu_align, | |
56919c5c | 3260 | 0, NULL); |
c16f862d RR |
3261 | if (!kvm_vcpu_cache) { |
3262 | r = -ENOMEM; | |
fb3600cc | 3263 | goto out_free_3; |
c16f862d RR |
3264 | } |
3265 | ||
af585b92 GN |
3266 | r = kvm_async_pf_init(); |
3267 | if (r) | |
3268 | goto out_free; | |
3269 | ||
6aa8b732 | 3270 | kvm_chardev_ops.owner = module; |
3d3aab1b CB |
3271 | kvm_vm_fops.owner = module; |
3272 | kvm_vcpu_fops.owner = module; | |
6aa8b732 AK |
3273 | |
3274 | r = misc_register(&kvm_dev); | |
3275 | if (r) { | |
d77c26fc | 3276 | printk(KERN_ERR "kvm: misc device register failed\n"); |
af585b92 | 3277 | goto out_unreg; |
6aa8b732 AK |
3278 | } |
3279 | ||
fb3600cc RW |
3280 | register_syscore_ops(&kvm_syscore_ops); |
3281 | ||
15ad7146 AK |
3282 | kvm_preempt_ops.sched_in = kvm_sched_in; |
3283 | kvm_preempt_ops.sched_out = kvm_sched_out; | |
3284 | ||
4f69b680 H |
3285 | r = kvm_init_debug(); |
3286 | if (r) { | |
3287 | printk(KERN_ERR "kvm: create debugfs files failed\n"); | |
3288 | goto out_undebugfs; | |
3289 | } | |
0ea4ed8e | 3290 | |
3c3c29fd PB |
3291 | r = kvm_vfio_ops_init(); |
3292 | WARN_ON(r); | |
3293 | ||
c7addb90 | 3294 | return 0; |
6aa8b732 | 3295 | |
4f69b680 H |
3296 | out_undebugfs: |
3297 | unregister_syscore_ops(&kvm_syscore_ops); | |
afc2f792 | 3298 | misc_deregister(&kvm_dev); |
af585b92 GN |
3299 | out_unreg: |
3300 | kvm_async_pf_deinit(); | |
6aa8b732 | 3301 | out_free: |
c16f862d | 3302 | kmem_cache_destroy(kvm_vcpu_cache); |
d2308784 | 3303 | out_free_3: |
6aa8b732 | 3304 | unregister_reboot_notifier(&kvm_reboot_notifier); |
774c47f1 | 3305 | unregister_cpu_notifier(&kvm_cpu_notifier); |
d2308784 | 3306 | out_free_2: |
d2308784 | 3307 | out_free_1: |
e9b11c17 | 3308 | kvm_arch_hardware_unsetup(); |
7f59f492 RR |
3309 | out_free_0a: |
3310 | free_cpumask_var(cpus_hardware_enabled); | |
d2308784 | 3311 | out_free_0: |
a0f155e9 CH |
3312 | kvm_irqfd_exit(); |
3313 | out_irqfd: | |
7dac16c3 AH |
3314 | kvm_arch_exit(); |
3315 | out_fail: | |
6aa8b732 AK |
3316 | return r; |
3317 | } | |
cb498ea2 | 3318 | EXPORT_SYMBOL_GPL(kvm_init); |
6aa8b732 | 3319 | |
cb498ea2 | 3320 | void kvm_exit(void) |
6aa8b732 | 3321 | { |
0ea4ed8e | 3322 | kvm_exit_debug(); |
6aa8b732 | 3323 | misc_deregister(&kvm_dev); |
c16f862d | 3324 | kmem_cache_destroy(kvm_vcpu_cache); |
af585b92 | 3325 | kvm_async_pf_deinit(); |
fb3600cc | 3326 | unregister_syscore_ops(&kvm_syscore_ops); |
6aa8b732 | 3327 | unregister_reboot_notifier(&kvm_reboot_notifier); |
59ae6c6b | 3328 | unregister_cpu_notifier(&kvm_cpu_notifier); |
75b7127c | 3329 | on_each_cpu(hardware_disable_nolock, NULL, 1); |
e9b11c17 | 3330 | kvm_arch_hardware_unsetup(); |
f8c16bba | 3331 | kvm_arch_exit(); |
a0f155e9 | 3332 | kvm_irqfd_exit(); |
7f59f492 | 3333 | free_cpumask_var(cpus_hardware_enabled); |
571ee1b6 | 3334 | kvm_vfio_ops_exit(); |
6aa8b732 | 3335 | } |
cb498ea2 | 3336 | EXPORT_SYMBOL_GPL(kvm_exit); |