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Commit | Line | Data |
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6aa8b732 AK |
1 | /* |
2 | * Kernel-based Virtual Machine driver for Linux | |
3 | * | |
4 | * This module enables machines with Intel VT-x extensions to run virtual | |
5 | * machines without emulation or binary translation. | |
6 | * | |
7 | * Copyright (C) 2006 Qumranet, Inc. | |
9611c187 | 8 | * Copyright 2010 Red Hat, Inc. and/or its affiliates. |
6aa8b732 AK |
9 | * |
10 | * Authors: | |
11 | * Avi Kivity <avi@qumranet.com> | |
12 | * Yaniv Kamay <yaniv@qumranet.com> | |
13 | * | |
14 | * This work is licensed under the terms of the GNU GPL, version 2. See | |
15 | * the COPYING file in the top-level directory. | |
16 | * | |
17 | */ | |
18 | ||
e2174021 | 19 | #include "iodev.h" |
6aa8b732 | 20 | |
edf88417 | 21 | #include <linux/kvm_host.h> |
6aa8b732 AK |
22 | #include <linux/kvm.h> |
23 | #include <linux/module.h> | |
24 | #include <linux/errno.h> | |
6aa8b732 | 25 | #include <linux/percpu.h> |
6aa8b732 AK |
26 | #include <linux/mm.h> |
27 | #include <linux/miscdevice.h> | |
28 | #include <linux/vmalloc.h> | |
6aa8b732 | 29 | #include <linux/reboot.h> |
6aa8b732 AK |
30 | #include <linux/debugfs.h> |
31 | #include <linux/highmem.h> | |
32 | #include <linux/file.h> | |
fb3600cc | 33 | #include <linux/syscore_ops.h> |
774c47f1 | 34 | #include <linux/cpu.h> |
e8edc6e0 | 35 | #include <linux/sched.h> |
d9e368d6 AK |
36 | #include <linux/cpumask.h> |
37 | #include <linux/smp.h> | |
d6d28168 | 38 | #include <linux/anon_inodes.h> |
04d2cc77 | 39 | #include <linux/profile.h> |
7aa81cc0 | 40 | #include <linux/kvm_para.h> |
6fc138d2 | 41 | #include <linux/pagemap.h> |
8d4e1288 | 42 | #include <linux/mman.h> |
35149e21 | 43 | #include <linux/swap.h> |
e56d532f | 44 | #include <linux/bitops.h> |
547de29e | 45 | #include <linux/spinlock.h> |
6ff5894c | 46 | #include <linux/compat.h> |
bc6678a3 | 47 | #include <linux/srcu.h> |
8f0b1ab6 | 48 | #include <linux/hugetlb.h> |
5a0e3ad6 | 49 | #include <linux/slab.h> |
743eeb0b SL |
50 | #include <linux/sort.h> |
51 | #include <linux/bsearch.h> | |
6aa8b732 | 52 | |
e495606d | 53 | #include <asm/processor.h> |
e495606d AK |
54 | #include <asm/io.h> |
55 | #include <asm/uaccess.h> | |
3e021bf5 | 56 | #include <asm/pgtable.h> |
6aa8b732 | 57 | |
5f94c174 | 58 | #include "coalesced_mmio.h" |
af585b92 | 59 | #include "async_pf.h" |
5f94c174 | 60 | |
229456fc MT |
61 | #define CREATE_TRACE_POINTS |
62 | #include <trace/events/kvm.h> | |
63 | ||
6aa8b732 AK |
64 | MODULE_AUTHOR("Qumranet"); |
65 | MODULE_LICENSE("GPL"); | |
66 | ||
fa40a821 MT |
67 | /* |
68 | * Ordering of locks: | |
69 | * | |
fae3a353 | 70 | * kvm->lock --> kvm->slots_lock --> kvm->irq_lock |
fa40a821 MT |
71 | */ |
72 | ||
e935b837 | 73 | DEFINE_RAW_SPINLOCK(kvm_lock); |
e9b11c17 | 74 | LIST_HEAD(vm_list); |
133de902 | 75 | |
7f59f492 | 76 | static cpumask_var_t cpus_hardware_enabled; |
10474ae8 AG |
77 | static int kvm_usage_count = 0; |
78 | static atomic_t hardware_enable_failed; | |
1b6c0168 | 79 | |
c16f862d RR |
80 | struct kmem_cache *kvm_vcpu_cache; |
81 | EXPORT_SYMBOL_GPL(kvm_vcpu_cache); | |
1165f5fe | 82 | |
15ad7146 AK |
83 | static __read_mostly struct preempt_ops kvm_preempt_ops; |
84 | ||
76f7c879 | 85 | struct dentry *kvm_debugfs_dir; |
6aa8b732 | 86 | |
bccf2150 AK |
87 | static long kvm_vcpu_ioctl(struct file *file, unsigned int ioctl, |
88 | unsigned long arg); | |
1dda606c AG |
89 | #ifdef CONFIG_COMPAT |
90 | static long kvm_vcpu_compat_ioctl(struct file *file, unsigned int ioctl, | |
91 | unsigned long arg); | |
92 | #endif | |
10474ae8 AG |
93 | static int hardware_enable_all(void); |
94 | static void hardware_disable_all(void); | |
bccf2150 | 95 | |
e93f8a0f MT |
96 | static void kvm_io_bus_destroy(struct kvm_io_bus *bus); |
97 | ||
b7c4145b AK |
98 | bool kvm_rebooting; |
99 | EXPORT_SYMBOL_GPL(kvm_rebooting); | |
4ecac3fd | 100 | |
54dee993 MT |
101 | static bool largepages_enabled = true; |
102 | ||
a2766325 | 103 | bool kvm_is_mmio_pfn(pfn_t pfn) |
cbff90a7 | 104 | { |
fc5659c8 | 105 | if (pfn_valid(pfn)) { |
22e5c47e | 106 | int reserved; |
936a5fe6 | 107 | struct page *tail = pfn_to_page(pfn); |
22e5c47e AA |
108 | struct page *head = compound_trans_head(tail); |
109 | reserved = PageReserved(head); | |
936a5fe6 | 110 | if (head != tail) { |
936a5fe6 | 111 | /* |
22e5c47e AA |
112 | * "head" is not a dangling pointer |
113 | * (compound_trans_head takes care of that) | |
114 | * but the hugepage may have been splitted | |
115 | * from under us (and we may not hold a | |
116 | * reference count on the head page so it can | |
117 | * be reused before we run PageReferenced), so | |
118 | * we've to check PageTail before returning | |
119 | * what we just read. | |
936a5fe6 | 120 | */ |
22e5c47e AA |
121 | smp_rmb(); |
122 | if (PageTail(tail)) | |
123 | return reserved; | |
936a5fe6 AA |
124 | } |
125 | return PageReserved(tail); | |
fc5659c8 | 126 | } |
cbff90a7 BAY |
127 | |
128 | return true; | |
129 | } | |
130 | ||
bccf2150 AK |
131 | /* |
132 | * Switches to specified vcpu, until a matching vcpu_put() | |
133 | */ | |
9fc77441 | 134 | int vcpu_load(struct kvm_vcpu *vcpu) |
6aa8b732 | 135 | { |
15ad7146 AK |
136 | int cpu; |
137 | ||
9fc77441 MT |
138 | if (mutex_lock_killable(&vcpu->mutex)) |
139 | return -EINTR; | |
34bb10b7 RR |
140 | if (unlikely(vcpu->pid != current->pids[PIDTYPE_PID].pid)) { |
141 | /* The thread running this VCPU changed. */ | |
142 | struct pid *oldpid = vcpu->pid; | |
143 | struct pid *newpid = get_task_pid(current, PIDTYPE_PID); | |
144 | rcu_assign_pointer(vcpu->pid, newpid); | |
145 | synchronize_rcu(); | |
146 | put_pid(oldpid); | |
147 | } | |
15ad7146 AK |
148 | cpu = get_cpu(); |
149 | preempt_notifier_register(&vcpu->preempt_notifier); | |
313a3dc7 | 150 | kvm_arch_vcpu_load(vcpu, cpu); |
15ad7146 | 151 | put_cpu(); |
9fc77441 | 152 | return 0; |
6aa8b732 AK |
153 | } |
154 | ||
313a3dc7 | 155 | void vcpu_put(struct kvm_vcpu *vcpu) |
6aa8b732 | 156 | { |
15ad7146 | 157 | preempt_disable(); |
313a3dc7 | 158 | kvm_arch_vcpu_put(vcpu); |
15ad7146 AK |
159 | preempt_notifier_unregister(&vcpu->preempt_notifier); |
160 | preempt_enable(); | |
6aa8b732 AK |
161 | mutex_unlock(&vcpu->mutex); |
162 | } | |
163 | ||
d9e368d6 AK |
164 | static void ack_flush(void *_completed) |
165 | { | |
d9e368d6 AK |
166 | } |
167 | ||
49846896 | 168 | static bool make_all_cpus_request(struct kvm *kvm, unsigned int req) |
d9e368d6 | 169 | { |
597a5f55 | 170 | int i, cpu, me; |
6ef7a1bc RR |
171 | cpumask_var_t cpus; |
172 | bool called = true; | |
d9e368d6 | 173 | struct kvm_vcpu *vcpu; |
d9e368d6 | 174 | |
79f55997 | 175 | zalloc_cpumask_var(&cpus, GFP_ATOMIC); |
6ef7a1bc | 176 | |
3cba4130 | 177 | me = get_cpu(); |
988a2cae | 178 | kvm_for_each_vcpu(i, vcpu, kvm) { |
3cba4130 | 179 | kvm_make_request(req, vcpu); |
d9e368d6 | 180 | cpu = vcpu->cpu; |
6b7e2d09 XG |
181 | |
182 | /* Set ->requests bit before we read ->mode */ | |
183 | smp_mb(); | |
184 | ||
185 | if (cpus != NULL && cpu != -1 && cpu != me && | |
186 | kvm_vcpu_exiting_guest_mode(vcpu) != OUTSIDE_GUEST_MODE) | |
6ef7a1bc | 187 | cpumask_set_cpu(cpu, cpus); |
49846896 | 188 | } |
6ef7a1bc RR |
189 | if (unlikely(cpus == NULL)) |
190 | smp_call_function_many(cpu_online_mask, ack_flush, NULL, 1); | |
191 | else if (!cpumask_empty(cpus)) | |
192 | smp_call_function_many(cpus, ack_flush, NULL, 1); | |
193 | else | |
194 | called = false; | |
3cba4130 | 195 | put_cpu(); |
6ef7a1bc | 196 | free_cpumask_var(cpus); |
49846896 | 197 | return called; |
d9e368d6 AK |
198 | } |
199 | ||
49846896 | 200 | void kvm_flush_remote_tlbs(struct kvm *kvm) |
2e53d63a | 201 | { |
bec87d6e | 202 | long dirty_count = kvm->tlbs_dirty; |
a4ee1ca4 XG |
203 | |
204 | smp_mb(); | |
49846896 RR |
205 | if (make_all_cpus_request(kvm, KVM_REQ_TLB_FLUSH)) |
206 | ++kvm->stat.remote_tlb_flush; | |
a4ee1ca4 | 207 | cmpxchg(&kvm->tlbs_dirty, dirty_count, 0); |
2e53d63a MT |
208 | } |
209 | ||
49846896 RR |
210 | void kvm_reload_remote_mmus(struct kvm *kvm) |
211 | { | |
212 | make_all_cpus_request(kvm, KVM_REQ_MMU_RELOAD); | |
213 | } | |
2e53d63a | 214 | |
d828199e MT |
215 | void kvm_make_mclock_inprogress_request(struct kvm *kvm) |
216 | { | |
217 | make_all_cpus_request(kvm, KVM_REQ_MCLOCK_INPROGRESS); | |
218 | } | |
219 | ||
fb3f0f51 RR |
220 | int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id) |
221 | { | |
222 | struct page *page; | |
223 | int r; | |
224 | ||
225 | mutex_init(&vcpu->mutex); | |
226 | vcpu->cpu = -1; | |
fb3f0f51 RR |
227 | vcpu->kvm = kvm; |
228 | vcpu->vcpu_id = id; | |
34bb10b7 | 229 | vcpu->pid = NULL; |
b6958ce4 | 230 | init_waitqueue_head(&vcpu->wq); |
af585b92 | 231 | kvm_async_pf_vcpu_init(vcpu); |
fb3f0f51 RR |
232 | |
233 | page = alloc_page(GFP_KERNEL | __GFP_ZERO); | |
234 | if (!page) { | |
235 | r = -ENOMEM; | |
236 | goto fail; | |
237 | } | |
238 | vcpu->run = page_address(page); | |
239 | ||
4c088493 R |
240 | kvm_vcpu_set_in_spin_loop(vcpu, false); |
241 | kvm_vcpu_set_dy_eligible(vcpu, false); | |
242 | ||
e9b11c17 | 243 | r = kvm_arch_vcpu_init(vcpu); |
fb3f0f51 | 244 | if (r < 0) |
e9b11c17 | 245 | goto fail_free_run; |
fb3f0f51 RR |
246 | return 0; |
247 | ||
fb3f0f51 RR |
248 | fail_free_run: |
249 | free_page((unsigned long)vcpu->run); | |
250 | fail: | |
76fafa5e | 251 | return r; |
fb3f0f51 RR |
252 | } |
253 | EXPORT_SYMBOL_GPL(kvm_vcpu_init); | |
254 | ||
255 | void kvm_vcpu_uninit(struct kvm_vcpu *vcpu) | |
256 | { | |
34bb10b7 | 257 | put_pid(vcpu->pid); |
e9b11c17 | 258 | kvm_arch_vcpu_uninit(vcpu); |
fb3f0f51 RR |
259 | free_page((unsigned long)vcpu->run); |
260 | } | |
261 | EXPORT_SYMBOL_GPL(kvm_vcpu_uninit); | |
262 | ||
e930bffe AA |
263 | #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER) |
264 | static inline struct kvm *mmu_notifier_to_kvm(struct mmu_notifier *mn) | |
265 | { | |
266 | return container_of(mn, struct kvm, mmu_notifier); | |
267 | } | |
268 | ||
269 | static void kvm_mmu_notifier_invalidate_page(struct mmu_notifier *mn, | |
270 | struct mm_struct *mm, | |
271 | unsigned long address) | |
272 | { | |
273 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
bc6678a3 | 274 | int need_tlb_flush, idx; |
e930bffe AA |
275 | |
276 | /* | |
277 | * When ->invalidate_page runs, the linux pte has been zapped | |
278 | * already but the page is still allocated until | |
279 | * ->invalidate_page returns. So if we increase the sequence | |
280 | * here the kvm page fault will notice if the spte can't be | |
281 | * established because the page is going to be freed. If | |
282 | * instead the kvm page fault establishes the spte before | |
283 | * ->invalidate_page runs, kvm_unmap_hva will release it | |
284 | * before returning. | |
285 | * | |
286 | * The sequence increase only need to be seen at spin_unlock | |
287 | * time, and not at spin_lock time. | |
288 | * | |
289 | * Increasing the sequence after the spin_unlock would be | |
290 | * unsafe because the kvm page fault could then establish the | |
291 | * pte after kvm_unmap_hva returned, without noticing the page | |
292 | * is going to be freed. | |
293 | */ | |
bc6678a3 | 294 | idx = srcu_read_lock(&kvm->srcu); |
e930bffe | 295 | spin_lock(&kvm->mmu_lock); |
565f3be2 | 296 | |
e930bffe | 297 | kvm->mmu_notifier_seq++; |
a4ee1ca4 | 298 | need_tlb_flush = kvm_unmap_hva(kvm, address) | kvm->tlbs_dirty; |
e930bffe AA |
299 | /* we've to flush the tlb before the pages can be freed */ |
300 | if (need_tlb_flush) | |
301 | kvm_flush_remote_tlbs(kvm); | |
302 | ||
565f3be2 TY |
303 | spin_unlock(&kvm->mmu_lock); |
304 | srcu_read_unlock(&kvm->srcu, idx); | |
e930bffe AA |
305 | } |
306 | ||
3da0dd43 IE |
307 | static void kvm_mmu_notifier_change_pte(struct mmu_notifier *mn, |
308 | struct mm_struct *mm, | |
309 | unsigned long address, | |
310 | pte_t pte) | |
311 | { | |
312 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
bc6678a3 | 313 | int idx; |
3da0dd43 | 314 | |
bc6678a3 | 315 | idx = srcu_read_lock(&kvm->srcu); |
3da0dd43 IE |
316 | spin_lock(&kvm->mmu_lock); |
317 | kvm->mmu_notifier_seq++; | |
318 | kvm_set_spte_hva(kvm, address, pte); | |
319 | spin_unlock(&kvm->mmu_lock); | |
bc6678a3 | 320 | srcu_read_unlock(&kvm->srcu, idx); |
3da0dd43 IE |
321 | } |
322 | ||
e930bffe AA |
323 | static void kvm_mmu_notifier_invalidate_range_start(struct mmu_notifier *mn, |
324 | struct mm_struct *mm, | |
325 | unsigned long start, | |
326 | unsigned long end) | |
327 | { | |
328 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
bc6678a3 | 329 | int need_tlb_flush = 0, idx; |
e930bffe | 330 | |
bc6678a3 | 331 | idx = srcu_read_lock(&kvm->srcu); |
e930bffe AA |
332 | spin_lock(&kvm->mmu_lock); |
333 | /* | |
334 | * The count increase must become visible at unlock time as no | |
335 | * spte can be established without taking the mmu_lock and | |
336 | * count is also read inside the mmu_lock critical section. | |
337 | */ | |
338 | kvm->mmu_notifier_count++; | |
b3ae2096 | 339 | need_tlb_flush = kvm_unmap_hva_range(kvm, start, end); |
a4ee1ca4 | 340 | need_tlb_flush |= kvm->tlbs_dirty; |
e930bffe AA |
341 | /* we've to flush the tlb before the pages can be freed */ |
342 | if (need_tlb_flush) | |
343 | kvm_flush_remote_tlbs(kvm); | |
565f3be2 TY |
344 | |
345 | spin_unlock(&kvm->mmu_lock); | |
346 | srcu_read_unlock(&kvm->srcu, idx); | |
e930bffe AA |
347 | } |
348 | ||
349 | static void kvm_mmu_notifier_invalidate_range_end(struct mmu_notifier *mn, | |
350 | struct mm_struct *mm, | |
351 | unsigned long start, | |
352 | unsigned long end) | |
353 | { | |
354 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
355 | ||
356 | spin_lock(&kvm->mmu_lock); | |
357 | /* | |
358 | * This sequence increase will notify the kvm page fault that | |
359 | * the page that is going to be mapped in the spte could have | |
360 | * been freed. | |
361 | */ | |
362 | kvm->mmu_notifier_seq++; | |
a355aa54 | 363 | smp_wmb(); |
e930bffe AA |
364 | /* |
365 | * The above sequence increase must be visible before the | |
a355aa54 PM |
366 | * below count decrease, which is ensured by the smp_wmb above |
367 | * in conjunction with the smp_rmb in mmu_notifier_retry(). | |
e930bffe AA |
368 | */ |
369 | kvm->mmu_notifier_count--; | |
370 | spin_unlock(&kvm->mmu_lock); | |
371 | ||
372 | BUG_ON(kvm->mmu_notifier_count < 0); | |
373 | } | |
374 | ||
375 | static int kvm_mmu_notifier_clear_flush_young(struct mmu_notifier *mn, | |
376 | struct mm_struct *mm, | |
377 | unsigned long address) | |
378 | { | |
379 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
bc6678a3 | 380 | int young, idx; |
e930bffe | 381 | |
bc6678a3 | 382 | idx = srcu_read_lock(&kvm->srcu); |
e930bffe | 383 | spin_lock(&kvm->mmu_lock); |
e930bffe | 384 | |
565f3be2 | 385 | young = kvm_age_hva(kvm, address); |
e930bffe AA |
386 | if (young) |
387 | kvm_flush_remote_tlbs(kvm); | |
388 | ||
565f3be2 TY |
389 | spin_unlock(&kvm->mmu_lock); |
390 | srcu_read_unlock(&kvm->srcu, idx); | |
391 | ||
e930bffe AA |
392 | return young; |
393 | } | |
394 | ||
8ee53820 AA |
395 | static int kvm_mmu_notifier_test_young(struct mmu_notifier *mn, |
396 | struct mm_struct *mm, | |
397 | unsigned long address) | |
398 | { | |
399 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
400 | int young, idx; | |
401 | ||
402 | idx = srcu_read_lock(&kvm->srcu); | |
403 | spin_lock(&kvm->mmu_lock); | |
404 | young = kvm_test_age_hva(kvm, address); | |
405 | spin_unlock(&kvm->mmu_lock); | |
406 | srcu_read_unlock(&kvm->srcu, idx); | |
407 | ||
408 | return young; | |
409 | } | |
410 | ||
85db06e5 MT |
411 | static void kvm_mmu_notifier_release(struct mmu_notifier *mn, |
412 | struct mm_struct *mm) | |
413 | { | |
414 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
eda2beda LJ |
415 | int idx; |
416 | ||
417 | idx = srcu_read_lock(&kvm->srcu); | |
2df72e9b | 418 | kvm_arch_flush_shadow_all(kvm); |
eda2beda | 419 | srcu_read_unlock(&kvm->srcu, idx); |
85db06e5 MT |
420 | } |
421 | ||
e930bffe AA |
422 | static const struct mmu_notifier_ops kvm_mmu_notifier_ops = { |
423 | .invalidate_page = kvm_mmu_notifier_invalidate_page, | |
424 | .invalidate_range_start = kvm_mmu_notifier_invalidate_range_start, | |
425 | .invalidate_range_end = kvm_mmu_notifier_invalidate_range_end, | |
426 | .clear_flush_young = kvm_mmu_notifier_clear_flush_young, | |
8ee53820 | 427 | .test_young = kvm_mmu_notifier_test_young, |
3da0dd43 | 428 | .change_pte = kvm_mmu_notifier_change_pte, |
85db06e5 | 429 | .release = kvm_mmu_notifier_release, |
e930bffe | 430 | }; |
4c07b0a4 AK |
431 | |
432 | static int kvm_init_mmu_notifier(struct kvm *kvm) | |
433 | { | |
434 | kvm->mmu_notifier.ops = &kvm_mmu_notifier_ops; | |
435 | return mmu_notifier_register(&kvm->mmu_notifier, current->mm); | |
436 | } | |
437 | ||
438 | #else /* !(CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER) */ | |
439 | ||
440 | static int kvm_init_mmu_notifier(struct kvm *kvm) | |
441 | { | |
442 | return 0; | |
443 | } | |
444 | ||
e930bffe AA |
445 | #endif /* CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER */ |
446 | ||
bf3e05bc XG |
447 | static void kvm_init_memslots_id(struct kvm *kvm) |
448 | { | |
449 | int i; | |
450 | struct kvm_memslots *slots = kvm->memslots; | |
451 | ||
452 | for (i = 0; i < KVM_MEM_SLOTS_NUM; i++) | |
f85e2cb5 | 453 | slots->id_to_index[i] = slots->memslots[i].id = i; |
bf3e05bc XG |
454 | } |
455 | ||
e08b9637 | 456 | static struct kvm *kvm_create_vm(unsigned long type) |
6aa8b732 | 457 | { |
d89f5eff JK |
458 | int r, i; |
459 | struct kvm *kvm = kvm_arch_alloc_vm(); | |
6aa8b732 | 460 | |
d89f5eff JK |
461 | if (!kvm) |
462 | return ERR_PTR(-ENOMEM); | |
463 | ||
e08b9637 | 464 | r = kvm_arch_init_vm(kvm, type); |
d89f5eff JK |
465 | if (r) |
466 | goto out_err_nodisable; | |
10474ae8 AG |
467 | |
468 | r = hardware_enable_all(); | |
469 | if (r) | |
470 | goto out_err_nodisable; | |
471 | ||
75858a84 AK |
472 | #ifdef CONFIG_HAVE_KVM_IRQCHIP |
473 | INIT_HLIST_HEAD(&kvm->mask_notifier_list); | |
136bdfee | 474 | INIT_HLIST_HEAD(&kvm->irq_ack_notifier_list); |
75858a84 | 475 | #endif |
6aa8b732 | 476 | |
1e702d9a AW |
477 | BUILD_BUG_ON(KVM_MEM_SLOTS_NUM > SHRT_MAX); |
478 | ||
46a26bf5 MT |
479 | r = -ENOMEM; |
480 | kvm->memslots = kzalloc(sizeof(struct kvm_memslots), GFP_KERNEL); | |
481 | if (!kvm->memslots) | |
57e7fbee | 482 | goto out_err_nosrcu; |
bf3e05bc | 483 | kvm_init_memslots_id(kvm); |
bc6678a3 | 484 | if (init_srcu_struct(&kvm->srcu)) |
57e7fbee | 485 | goto out_err_nosrcu; |
e93f8a0f MT |
486 | for (i = 0; i < KVM_NR_BUSES; i++) { |
487 | kvm->buses[i] = kzalloc(sizeof(struct kvm_io_bus), | |
488 | GFP_KERNEL); | |
57e7fbee | 489 | if (!kvm->buses[i]) |
e93f8a0f | 490 | goto out_err; |
e93f8a0f | 491 | } |
e930bffe | 492 | |
74b5c5bf | 493 | spin_lock_init(&kvm->mmu_lock); |
6d4e4c4f AK |
494 | kvm->mm = current->mm; |
495 | atomic_inc(&kvm->mm->mm_count); | |
d34e6b17 | 496 | kvm_eventfd_init(kvm); |
11ec2804 | 497 | mutex_init(&kvm->lock); |
60eead79 | 498 | mutex_init(&kvm->irq_lock); |
79fac95e | 499 | mutex_init(&kvm->slots_lock); |
d39f13b0 | 500 | atomic_set(&kvm->users_count, 1); |
74b5c5bf MW |
501 | |
502 | r = kvm_init_mmu_notifier(kvm); | |
503 | if (r) | |
504 | goto out_err; | |
505 | ||
e935b837 | 506 | raw_spin_lock(&kvm_lock); |
5e58cfe4 | 507 | list_add(&kvm->vm_list, &vm_list); |
e935b837 | 508 | raw_spin_unlock(&kvm_lock); |
d89f5eff | 509 | |
f17abe9a | 510 | return kvm; |
10474ae8 AG |
511 | |
512 | out_err: | |
57e7fbee JK |
513 | cleanup_srcu_struct(&kvm->srcu); |
514 | out_err_nosrcu: | |
10474ae8 AG |
515 | hardware_disable_all(); |
516 | out_err_nodisable: | |
e93f8a0f MT |
517 | for (i = 0; i < KVM_NR_BUSES; i++) |
518 | kfree(kvm->buses[i]); | |
46a26bf5 | 519 | kfree(kvm->memslots); |
d89f5eff | 520 | kvm_arch_free_vm(kvm); |
10474ae8 | 521 | return ERR_PTR(r); |
f17abe9a AK |
522 | } |
523 | ||
92eca8fa TY |
524 | /* |
525 | * Avoid using vmalloc for a small buffer. | |
526 | * Should not be used when the size is statically known. | |
527 | */ | |
c1a7b32a | 528 | void *kvm_kvzalloc(unsigned long size) |
92eca8fa TY |
529 | { |
530 | if (size > PAGE_SIZE) | |
531 | return vzalloc(size); | |
532 | else | |
533 | return kzalloc(size, GFP_KERNEL); | |
534 | } | |
535 | ||
c1a7b32a | 536 | void kvm_kvfree(const void *addr) |
92eca8fa TY |
537 | { |
538 | if (is_vmalloc_addr(addr)) | |
539 | vfree(addr); | |
540 | else | |
541 | kfree(addr); | |
542 | } | |
543 | ||
a36a57b1 TY |
544 | static void kvm_destroy_dirty_bitmap(struct kvm_memory_slot *memslot) |
545 | { | |
546 | if (!memslot->dirty_bitmap) | |
547 | return; | |
548 | ||
92eca8fa | 549 | kvm_kvfree(memslot->dirty_bitmap); |
a36a57b1 TY |
550 | memslot->dirty_bitmap = NULL; |
551 | } | |
552 | ||
6aa8b732 AK |
553 | /* |
554 | * Free any memory in @free but not in @dont. | |
555 | */ | |
556 | static void kvm_free_physmem_slot(struct kvm_memory_slot *free, | |
557 | struct kvm_memory_slot *dont) | |
558 | { | |
6aa8b732 | 559 | if (!dont || free->dirty_bitmap != dont->dirty_bitmap) |
a36a57b1 | 560 | kvm_destroy_dirty_bitmap(free); |
6aa8b732 | 561 | |
db3fe4eb | 562 | kvm_arch_free_memslot(free, dont); |
05da4558 | 563 | |
6aa8b732 | 564 | free->npages = 0; |
6aa8b732 AK |
565 | } |
566 | ||
d19a9cd2 | 567 | void kvm_free_physmem(struct kvm *kvm) |
6aa8b732 | 568 | { |
46a26bf5 | 569 | struct kvm_memslots *slots = kvm->memslots; |
be6ba0f0 | 570 | struct kvm_memory_slot *memslot; |
46a26bf5 | 571 | |
be6ba0f0 XG |
572 | kvm_for_each_memslot(memslot, slots) |
573 | kvm_free_physmem_slot(memslot, NULL); | |
6aa8b732 | 574 | |
46a26bf5 | 575 | kfree(kvm->memslots); |
6aa8b732 AK |
576 | } |
577 | ||
f17abe9a AK |
578 | static void kvm_destroy_vm(struct kvm *kvm) |
579 | { | |
e93f8a0f | 580 | int i; |
6d4e4c4f AK |
581 | struct mm_struct *mm = kvm->mm; |
582 | ||
ad8ba2cd | 583 | kvm_arch_sync_events(kvm); |
e935b837 | 584 | raw_spin_lock(&kvm_lock); |
133de902 | 585 | list_del(&kvm->vm_list); |
e935b837 | 586 | raw_spin_unlock(&kvm_lock); |
399ec807 | 587 | kvm_free_irq_routing(kvm); |
e93f8a0f MT |
588 | for (i = 0; i < KVM_NR_BUSES; i++) |
589 | kvm_io_bus_destroy(kvm->buses[i]); | |
980da6ce | 590 | kvm_coalesced_mmio_free(kvm); |
e930bffe AA |
591 | #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER) |
592 | mmu_notifier_unregister(&kvm->mmu_notifier, kvm->mm); | |
f00be0ca | 593 | #else |
2df72e9b | 594 | kvm_arch_flush_shadow_all(kvm); |
5f94c174 | 595 | #endif |
d19a9cd2 | 596 | kvm_arch_destroy_vm(kvm); |
d89f5eff JK |
597 | kvm_free_physmem(kvm); |
598 | cleanup_srcu_struct(&kvm->srcu); | |
599 | kvm_arch_free_vm(kvm); | |
10474ae8 | 600 | hardware_disable_all(); |
6d4e4c4f | 601 | mmdrop(mm); |
f17abe9a AK |
602 | } |
603 | ||
d39f13b0 IE |
604 | void kvm_get_kvm(struct kvm *kvm) |
605 | { | |
606 | atomic_inc(&kvm->users_count); | |
607 | } | |
608 | EXPORT_SYMBOL_GPL(kvm_get_kvm); | |
609 | ||
610 | void kvm_put_kvm(struct kvm *kvm) | |
611 | { | |
612 | if (atomic_dec_and_test(&kvm->users_count)) | |
613 | kvm_destroy_vm(kvm); | |
614 | } | |
615 | EXPORT_SYMBOL_GPL(kvm_put_kvm); | |
616 | ||
617 | ||
f17abe9a AK |
618 | static int kvm_vm_release(struct inode *inode, struct file *filp) |
619 | { | |
620 | struct kvm *kvm = filp->private_data; | |
621 | ||
721eecbf GH |
622 | kvm_irqfd_release(kvm); |
623 | ||
d39f13b0 | 624 | kvm_put_kvm(kvm); |
6aa8b732 AK |
625 | return 0; |
626 | } | |
627 | ||
515a0127 TY |
628 | /* |
629 | * Allocation size is twice as large as the actual dirty bitmap size. | |
93474b25 | 630 | * See x86's kvm_vm_ioctl_get_dirty_log() why this is needed. |
515a0127 | 631 | */ |
a36a57b1 TY |
632 | static int kvm_create_dirty_bitmap(struct kvm_memory_slot *memslot) |
633 | { | |
189a2f7b | 634 | #ifndef CONFIG_S390 |
515a0127 | 635 | unsigned long dirty_bytes = 2 * kvm_dirty_bitmap_bytes(memslot); |
a36a57b1 | 636 | |
92eca8fa | 637 | memslot->dirty_bitmap = kvm_kvzalloc(dirty_bytes); |
a36a57b1 TY |
638 | if (!memslot->dirty_bitmap) |
639 | return -ENOMEM; | |
640 | ||
189a2f7b | 641 | #endif /* !CONFIG_S390 */ |
a36a57b1 TY |
642 | return 0; |
643 | } | |
644 | ||
bf3e05bc XG |
645 | static int cmp_memslot(const void *slot1, const void *slot2) |
646 | { | |
647 | struct kvm_memory_slot *s1, *s2; | |
648 | ||
649 | s1 = (struct kvm_memory_slot *)slot1; | |
650 | s2 = (struct kvm_memory_slot *)slot2; | |
651 | ||
652 | if (s1->npages < s2->npages) | |
653 | return 1; | |
654 | if (s1->npages > s2->npages) | |
655 | return -1; | |
656 | ||
657 | return 0; | |
658 | } | |
659 | ||
660 | /* | |
661 | * Sort the memslots base on its size, so the larger slots | |
662 | * will get better fit. | |
663 | */ | |
664 | static void sort_memslots(struct kvm_memslots *slots) | |
665 | { | |
f85e2cb5 XG |
666 | int i; |
667 | ||
bf3e05bc XG |
668 | sort(slots->memslots, KVM_MEM_SLOTS_NUM, |
669 | sizeof(struct kvm_memory_slot), cmp_memslot, NULL); | |
f85e2cb5 XG |
670 | |
671 | for (i = 0; i < KVM_MEM_SLOTS_NUM; i++) | |
672 | slots->id_to_index[slots->memslots[i].id] = i; | |
bf3e05bc XG |
673 | } |
674 | ||
be593d62 XG |
675 | void update_memslots(struct kvm_memslots *slots, struct kvm_memory_slot *new) |
676 | { | |
677 | if (new) { | |
678 | int id = new->id; | |
28a37544 | 679 | struct kvm_memory_slot *old = id_to_memslot(slots, id); |
bf3e05bc | 680 | unsigned long npages = old->npages; |
be593d62 | 681 | |
28a37544 | 682 | *old = *new; |
bf3e05bc XG |
683 | if (new->npages != npages) |
684 | sort_memslots(slots); | |
be593d62 XG |
685 | } |
686 | ||
687 | slots->generation++; | |
688 | } | |
689 | ||
a50d64d6 XG |
690 | static int check_memory_region_flags(struct kvm_userspace_memory_region *mem) |
691 | { | |
4d8b81ab XG |
692 | u32 valid_flags = KVM_MEM_LOG_DIRTY_PAGES; |
693 | ||
694 | #ifdef KVM_CAP_READONLY_MEM | |
695 | valid_flags |= KVM_MEM_READONLY; | |
696 | #endif | |
697 | ||
698 | if (mem->flags & ~valid_flags) | |
a50d64d6 XG |
699 | return -EINVAL; |
700 | ||
701 | return 0; | |
702 | } | |
703 | ||
6aa8b732 AK |
704 | /* |
705 | * Allocate some memory and give it an address in the guest physical address | |
706 | * space. | |
707 | * | |
708 | * Discontiguous memory is allowed, mostly for framebuffers. | |
f78e0e2e | 709 | * |
10589a46 | 710 | * Must be called holding mmap_sem for write. |
6aa8b732 | 711 | */ |
f78e0e2e SY |
712 | int __kvm_set_memory_region(struct kvm *kvm, |
713 | struct kvm_userspace_memory_region *mem, | |
f82a8cfe | 714 | bool user_alloc) |
6aa8b732 | 715 | { |
8234b22e | 716 | int r; |
6aa8b732 | 717 | gfn_t base_gfn; |
28bcb112 | 718 | unsigned long npages; |
5419369e | 719 | struct kvm_memory_slot *memslot, *slot; |
6aa8b732 | 720 | struct kvm_memory_slot old, new; |
b7f69c55 | 721 | struct kvm_memslots *slots = NULL, *old_memslots; |
6aa8b732 | 722 | |
a50d64d6 XG |
723 | r = check_memory_region_flags(mem); |
724 | if (r) | |
725 | goto out; | |
726 | ||
6aa8b732 AK |
727 | r = -EINVAL; |
728 | /* General sanity checks */ | |
729 | if (mem->memory_size & (PAGE_SIZE - 1)) | |
730 | goto out; | |
731 | if (mem->guest_phys_addr & (PAGE_SIZE - 1)) | |
732 | goto out; | |
fa3d315a TY |
733 | /* We can read the guest memory with __xxx_user() later on. */ |
734 | if (user_alloc && | |
735 | ((mem->userspace_addr & (PAGE_SIZE - 1)) || | |
9e3bb6b6 HC |
736 | !access_ok(VERIFY_WRITE, |
737 | (void __user *)(unsigned long)mem->userspace_addr, | |
738 | mem->memory_size))) | |
78749809 | 739 | goto out; |
93a5cef0 | 740 | if (mem->slot >= KVM_MEM_SLOTS_NUM) |
6aa8b732 AK |
741 | goto out; |
742 | if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr) | |
743 | goto out; | |
744 | ||
28a37544 | 745 | memslot = id_to_memslot(kvm->memslots, mem->slot); |
6aa8b732 AK |
746 | base_gfn = mem->guest_phys_addr >> PAGE_SHIFT; |
747 | npages = mem->memory_size >> PAGE_SHIFT; | |
748 | ||
660c22c4 TY |
749 | r = -EINVAL; |
750 | if (npages > KVM_MEM_MAX_NR_PAGES) | |
751 | goto out; | |
752 | ||
6aa8b732 AK |
753 | if (!npages) |
754 | mem->flags &= ~KVM_MEM_LOG_DIRTY_PAGES; | |
755 | ||
6aa8b732 AK |
756 | new = old = *memslot; |
757 | ||
e36d96f7 | 758 | new.id = mem->slot; |
6aa8b732 AK |
759 | new.base_gfn = base_gfn; |
760 | new.npages = npages; | |
761 | new.flags = mem->flags; | |
762 | ||
f0736cf0 AW |
763 | /* |
764 | * Disallow changing a memory slot's size or changing anything about | |
765 | * zero sized slots that doesn't involve making them non-zero. | |
766 | */ | |
6aa8b732 AK |
767 | r = -EINVAL; |
768 | if (npages && old.npages && npages != old.npages) | |
f78e0e2e | 769 | goto out_free; |
f0736cf0 AW |
770 | if (!npages && !old.npages) |
771 | goto out_free; | |
6aa8b732 AK |
772 | |
773 | /* Check for overlaps */ | |
774 | r = -EEXIST; | |
5419369e | 775 | kvm_for_each_memslot(slot, kvm->memslots) { |
bbacc0c1 | 776 | if (slot->id >= KVM_USER_MEM_SLOTS || slot == memslot) |
6aa8b732 | 777 | continue; |
5419369e AW |
778 | if (!((base_gfn + npages <= slot->base_gfn) || |
779 | (base_gfn >= slot->base_gfn + slot->npages))) | |
f78e0e2e | 780 | goto out_free; |
6aa8b732 | 781 | } |
6aa8b732 | 782 | |
6aa8b732 AK |
783 | /* Free page dirty bitmap if unneeded */ |
784 | if (!(new.flags & KVM_MEM_LOG_DIRTY_PAGES)) | |
8b6d44c7 | 785 | new.dirty_bitmap = NULL; |
6aa8b732 AK |
786 | |
787 | r = -ENOMEM; | |
788 | ||
9c695d42 AW |
789 | /* |
790 | * Allocate if a slot is being created. If modifying a slot, | |
791 | * the userspace_addr cannot change. | |
792 | */ | |
f0736cf0 | 793 | if (!old.npages) { |
189a2f7b TY |
794 | new.user_alloc = user_alloc; |
795 | new.userspace_addr = mem->userspace_addr; | |
d89cc617 | 796 | |
db3fe4eb TY |
797 | if (kvm_arch_create_memslot(&new, npages)) |
798 | goto out_free; | |
9c695d42 AW |
799 | } else if (npages && mem->userspace_addr != old.userspace_addr) { |
800 | r = -EINVAL; | |
801 | goto out_free; | |
6aa8b732 | 802 | } |
ec04b260 | 803 | |
6aa8b732 AK |
804 | /* Allocate page dirty bitmap if needed */ |
805 | if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) { | |
a36a57b1 | 806 | if (kvm_create_dirty_bitmap(&new) < 0) |
f78e0e2e | 807 | goto out_free; |
bc6678a3 | 808 | /* destroy any largepage mappings for dirty tracking */ |
6aa8b732 AK |
809 | } |
810 | ||
12d6e753 | 811 | if (!npages || base_gfn != old.base_gfn) { |
28a37544 XG |
812 | struct kvm_memory_slot *slot; |
813 | ||
bc6678a3 | 814 | r = -ENOMEM; |
6da64fdb TM |
815 | slots = kmemdup(kvm->memslots, sizeof(struct kvm_memslots), |
816 | GFP_KERNEL); | |
bc6678a3 MT |
817 | if (!slots) |
818 | goto out_free; | |
28a37544 XG |
819 | slot = id_to_memslot(slots, mem->slot); |
820 | slot->flags |= KVM_MEMSLOT_INVALID; | |
821 | ||
be593d62 | 822 | update_memslots(slots, NULL); |
bc6678a3 MT |
823 | |
824 | old_memslots = kvm->memslots; | |
825 | rcu_assign_pointer(kvm->memslots, slots); | |
826 | synchronize_srcu_expedited(&kvm->srcu); | |
e40f193f AW |
827 | /* slot was deleted or moved, clear iommu mapping */ |
828 | kvm_iommu_unmap_pages(kvm, &old); | |
12d6e753 MT |
829 | /* From this point no new shadow pages pointing to a deleted, |
830 | * or moved, memslot will be created. | |
bc6678a3 MT |
831 | * |
832 | * validation of sp->gfn happens in: | |
833 | * - gfn_to_hva (kvm_read_guest, gfn_to_pfn) | |
834 | * - kvm_is_visible_gfn (mmu_check_roots) | |
835 | */ | |
2df72e9b | 836 | kvm_arch_flush_shadow_memslot(kvm, slot); |
b7f69c55 | 837 | slots = old_memslots; |
bc6678a3 | 838 | } |
34d4cb8f | 839 | |
f7784b8e MT |
840 | r = kvm_arch_prepare_memory_region(kvm, &new, old, mem, user_alloc); |
841 | if (r) | |
b7f69c55 | 842 | goto out_slots; |
f7784b8e | 843 | |
bc6678a3 | 844 | r = -ENOMEM; |
b7f69c55 AW |
845 | /* |
846 | * We can re-use the old_memslots from above, the only difference | |
847 | * from the currently installed memslots is the invalid flag. This | |
848 | * will get overwritten by update_memslots anyway. | |
849 | */ | |
850 | if (!slots) { | |
851 | slots = kmemdup(kvm->memslots, sizeof(struct kvm_memslots), | |
852 | GFP_KERNEL); | |
853 | if (!slots) | |
854 | goto out_free; | |
855 | } | |
bc6678a3 | 856 | |
e40f193f AW |
857 | /* map new memory slot into the iommu */ |
858 | if (npages) { | |
859 | r = kvm_iommu_map_pages(kvm, &new); | |
860 | if (r) | |
861 | goto out_slots; | |
862 | } | |
863 | ||
bc6678a3 MT |
864 | /* actual memory is freed via old in kvm_free_physmem_slot below */ |
865 | if (!npages) { | |
bc6678a3 | 866 | new.dirty_bitmap = NULL; |
db3fe4eb | 867 | memset(&new.arch, 0, sizeof(new.arch)); |
bc6678a3 MT |
868 | } |
869 | ||
be593d62 | 870 | update_memslots(slots, &new); |
bc6678a3 MT |
871 | old_memslots = kvm->memslots; |
872 | rcu_assign_pointer(kvm->memslots, slots); | |
873 | synchronize_srcu_expedited(&kvm->srcu); | |
3ad82a7e | 874 | |
f7784b8e | 875 | kvm_arch_commit_memory_region(kvm, mem, old, user_alloc); |
82ce2c96 | 876 | |
bc6678a3 MT |
877 | kvm_free_physmem_slot(&old, &new); |
878 | kfree(old_memslots); | |
879 | ||
6aa8b732 AK |
880 | return 0; |
881 | ||
e40f193f AW |
882 | out_slots: |
883 | kfree(slots); | |
f78e0e2e | 884 | out_free: |
6aa8b732 AK |
885 | kvm_free_physmem_slot(&new, &old); |
886 | out: | |
887 | return r; | |
210c7c4d IE |
888 | |
889 | } | |
f78e0e2e SY |
890 | EXPORT_SYMBOL_GPL(__kvm_set_memory_region); |
891 | ||
892 | int kvm_set_memory_region(struct kvm *kvm, | |
893 | struct kvm_userspace_memory_region *mem, | |
f82a8cfe | 894 | bool user_alloc) |
f78e0e2e SY |
895 | { |
896 | int r; | |
897 | ||
79fac95e | 898 | mutex_lock(&kvm->slots_lock); |
f78e0e2e | 899 | r = __kvm_set_memory_region(kvm, mem, user_alloc); |
79fac95e | 900 | mutex_unlock(&kvm->slots_lock); |
f78e0e2e SY |
901 | return r; |
902 | } | |
210c7c4d IE |
903 | EXPORT_SYMBOL_GPL(kvm_set_memory_region); |
904 | ||
1fe779f8 CO |
905 | int kvm_vm_ioctl_set_memory_region(struct kvm *kvm, |
906 | struct | |
907 | kvm_userspace_memory_region *mem, | |
f82a8cfe | 908 | bool user_alloc) |
210c7c4d | 909 | { |
bbacc0c1 | 910 | if (mem->slot >= KVM_USER_MEM_SLOTS) |
e0d62c7f | 911 | return -EINVAL; |
210c7c4d | 912 | return kvm_set_memory_region(kvm, mem, user_alloc); |
6aa8b732 AK |
913 | } |
914 | ||
5bb064dc ZX |
915 | int kvm_get_dirty_log(struct kvm *kvm, |
916 | struct kvm_dirty_log *log, int *is_dirty) | |
6aa8b732 AK |
917 | { |
918 | struct kvm_memory_slot *memslot; | |
919 | int r, i; | |
87bf6e7d | 920 | unsigned long n; |
6aa8b732 AK |
921 | unsigned long any = 0; |
922 | ||
6aa8b732 | 923 | r = -EINVAL; |
bbacc0c1 | 924 | if (log->slot >= KVM_USER_MEM_SLOTS) |
6aa8b732 AK |
925 | goto out; |
926 | ||
28a37544 | 927 | memslot = id_to_memslot(kvm->memslots, log->slot); |
6aa8b732 AK |
928 | r = -ENOENT; |
929 | if (!memslot->dirty_bitmap) | |
930 | goto out; | |
931 | ||
87bf6e7d | 932 | n = kvm_dirty_bitmap_bytes(memslot); |
6aa8b732 | 933 | |
cd1a4a98 | 934 | for (i = 0; !any && i < n/sizeof(long); ++i) |
6aa8b732 AK |
935 | any = memslot->dirty_bitmap[i]; |
936 | ||
937 | r = -EFAULT; | |
938 | if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n)) | |
939 | goto out; | |
940 | ||
5bb064dc ZX |
941 | if (any) |
942 | *is_dirty = 1; | |
6aa8b732 AK |
943 | |
944 | r = 0; | |
6aa8b732 | 945 | out: |
6aa8b732 AK |
946 | return r; |
947 | } | |
948 | ||
db3fe4eb TY |
949 | bool kvm_largepages_enabled(void) |
950 | { | |
951 | return largepages_enabled; | |
952 | } | |
953 | ||
54dee993 MT |
954 | void kvm_disable_largepages(void) |
955 | { | |
956 | largepages_enabled = false; | |
957 | } | |
958 | EXPORT_SYMBOL_GPL(kvm_disable_largepages); | |
959 | ||
49c7754c GN |
960 | struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn) |
961 | { | |
962 | return __gfn_to_memslot(kvm_memslots(kvm), gfn); | |
963 | } | |
a1f4d395 | 964 | EXPORT_SYMBOL_GPL(gfn_to_memslot); |
6aa8b732 | 965 | |
e0d62c7f IE |
966 | int kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn) |
967 | { | |
bf3e05bc | 968 | struct kvm_memory_slot *memslot = gfn_to_memslot(kvm, gfn); |
e0d62c7f | 969 | |
bbacc0c1 | 970 | if (!memslot || memslot->id >= KVM_USER_MEM_SLOTS || |
bf3e05bc XG |
971 | memslot->flags & KVM_MEMSLOT_INVALID) |
972 | return 0; | |
e0d62c7f | 973 | |
bf3e05bc | 974 | return 1; |
e0d62c7f IE |
975 | } |
976 | EXPORT_SYMBOL_GPL(kvm_is_visible_gfn); | |
977 | ||
8f0b1ab6 JR |
978 | unsigned long kvm_host_page_size(struct kvm *kvm, gfn_t gfn) |
979 | { | |
980 | struct vm_area_struct *vma; | |
981 | unsigned long addr, size; | |
982 | ||
983 | size = PAGE_SIZE; | |
984 | ||
985 | addr = gfn_to_hva(kvm, gfn); | |
986 | if (kvm_is_error_hva(addr)) | |
987 | return PAGE_SIZE; | |
988 | ||
989 | down_read(¤t->mm->mmap_sem); | |
990 | vma = find_vma(current->mm, addr); | |
991 | if (!vma) | |
992 | goto out; | |
993 | ||
994 | size = vma_kernel_pagesize(vma); | |
995 | ||
996 | out: | |
997 | up_read(¤t->mm->mmap_sem); | |
998 | ||
999 | return size; | |
1000 | } | |
1001 | ||
4d8b81ab XG |
1002 | static bool memslot_is_readonly(struct kvm_memory_slot *slot) |
1003 | { | |
1004 | return slot->flags & KVM_MEM_READONLY; | |
1005 | } | |
1006 | ||
4d8b81ab XG |
1007 | static unsigned long __gfn_to_hva_many(struct kvm_memory_slot *slot, gfn_t gfn, |
1008 | gfn_t *nr_pages, bool write) | |
539cb660 | 1009 | { |
bc6678a3 | 1010 | if (!slot || slot->flags & KVM_MEMSLOT_INVALID) |
ca3a490c | 1011 | return KVM_HVA_ERR_BAD; |
48987781 | 1012 | |
4d8b81ab XG |
1013 | if (memslot_is_readonly(slot) && write) |
1014 | return KVM_HVA_ERR_RO_BAD; | |
48987781 XG |
1015 | |
1016 | if (nr_pages) | |
1017 | *nr_pages = slot->npages - (gfn - slot->base_gfn); | |
1018 | ||
4d8b81ab | 1019 | return __gfn_to_hva_memslot(slot, gfn); |
539cb660 | 1020 | } |
48987781 | 1021 | |
4d8b81ab XG |
1022 | static unsigned long gfn_to_hva_many(struct kvm_memory_slot *slot, gfn_t gfn, |
1023 | gfn_t *nr_pages) | |
1024 | { | |
1025 | return __gfn_to_hva_many(slot, gfn, nr_pages, true); | |
539cb660 | 1026 | } |
48987781 | 1027 | |
4d8b81ab XG |
1028 | unsigned long gfn_to_hva_memslot(struct kvm_memory_slot *slot, |
1029 | gfn_t gfn) | |
1030 | { | |
1031 | return gfn_to_hva_many(slot, gfn, NULL); | |
1032 | } | |
1033 | EXPORT_SYMBOL_GPL(gfn_to_hva_memslot); | |
1034 | ||
48987781 XG |
1035 | unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn) |
1036 | { | |
49c7754c | 1037 | return gfn_to_hva_many(gfn_to_memslot(kvm, gfn), gfn, NULL); |
48987781 | 1038 | } |
0d150298 | 1039 | EXPORT_SYMBOL_GPL(gfn_to_hva); |
539cb660 | 1040 | |
86ab8cff XG |
1041 | /* |
1042 | * The hva returned by this function is only allowed to be read. | |
1043 | * It should pair with kvm_read_hva() or kvm_read_hva_atomic(). | |
1044 | */ | |
1045 | static unsigned long gfn_to_hva_read(struct kvm *kvm, gfn_t gfn) | |
1046 | { | |
4d8b81ab | 1047 | return __gfn_to_hva_many(gfn_to_memslot(kvm, gfn), gfn, NULL, false); |
86ab8cff XG |
1048 | } |
1049 | ||
1050 | static int kvm_read_hva(void *data, void __user *hva, int len) | |
8030089f | 1051 | { |
86ab8cff XG |
1052 | return __copy_from_user(data, hva, len); |
1053 | } | |
1054 | ||
1055 | static int kvm_read_hva_atomic(void *data, void __user *hva, int len) | |
1056 | { | |
1057 | return __copy_from_user_inatomic(data, hva, len); | |
8030089f GN |
1058 | } |
1059 | ||
0857b9e9 GN |
1060 | int get_user_page_nowait(struct task_struct *tsk, struct mm_struct *mm, |
1061 | unsigned long start, int write, struct page **page) | |
1062 | { | |
1063 | int flags = FOLL_TOUCH | FOLL_NOWAIT | FOLL_HWPOISON | FOLL_GET; | |
1064 | ||
1065 | if (write) | |
1066 | flags |= FOLL_WRITE; | |
1067 | ||
1068 | return __get_user_pages(tsk, mm, start, 1, flags, page, NULL, NULL); | |
1069 | } | |
1070 | ||
fafc3dba HY |
1071 | static inline int check_user_page_hwpoison(unsigned long addr) |
1072 | { | |
1073 | int rc, flags = FOLL_TOUCH | FOLL_HWPOISON | FOLL_WRITE; | |
1074 | ||
1075 | rc = __get_user_pages(current, current->mm, addr, 1, | |
1076 | flags, NULL, NULL, NULL); | |
1077 | return rc == -EHWPOISON; | |
1078 | } | |
1079 | ||
2fc84311 XG |
1080 | /* |
1081 | * The atomic path to get the writable pfn which will be stored in @pfn, | |
1082 | * true indicates success, otherwise false is returned. | |
1083 | */ | |
1084 | static bool hva_to_pfn_fast(unsigned long addr, bool atomic, bool *async, | |
1085 | bool write_fault, bool *writable, pfn_t *pfn) | |
954bbbc2 | 1086 | { |
8d4e1288 | 1087 | struct page *page[1]; |
2fc84311 | 1088 | int npages; |
954bbbc2 | 1089 | |
2fc84311 XG |
1090 | if (!(async || atomic)) |
1091 | return false; | |
af585b92 | 1092 | |
12ce13fe XG |
1093 | /* |
1094 | * Fast pin a writable pfn only if it is a write fault request | |
1095 | * or the caller allows to map a writable pfn for a read fault | |
1096 | * request. | |
1097 | */ | |
1098 | if (!(write_fault || writable)) | |
1099 | return false; | |
612819c3 | 1100 | |
2fc84311 XG |
1101 | npages = __get_user_pages_fast(addr, 1, 1, page); |
1102 | if (npages == 1) { | |
1103 | *pfn = page_to_pfn(page[0]); | |
612819c3 | 1104 | |
2fc84311 XG |
1105 | if (writable) |
1106 | *writable = true; | |
1107 | return true; | |
1108 | } | |
af585b92 | 1109 | |
2fc84311 XG |
1110 | return false; |
1111 | } | |
612819c3 | 1112 | |
2fc84311 XG |
1113 | /* |
1114 | * The slow path to get the pfn of the specified host virtual address, | |
1115 | * 1 indicates success, -errno is returned if error is detected. | |
1116 | */ | |
1117 | static int hva_to_pfn_slow(unsigned long addr, bool *async, bool write_fault, | |
1118 | bool *writable, pfn_t *pfn) | |
1119 | { | |
1120 | struct page *page[1]; | |
1121 | int npages = 0; | |
612819c3 | 1122 | |
2fc84311 XG |
1123 | might_sleep(); |
1124 | ||
1125 | if (writable) | |
1126 | *writable = write_fault; | |
1127 | ||
1128 | if (async) { | |
1129 | down_read(¤t->mm->mmap_sem); | |
1130 | npages = get_user_page_nowait(current, current->mm, | |
1131 | addr, write_fault, page); | |
1132 | up_read(¤t->mm->mmap_sem); | |
1133 | } else | |
1134 | npages = get_user_pages_fast(addr, 1, write_fault, | |
1135 | page); | |
1136 | if (npages != 1) | |
1137 | return npages; | |
1138 | ||
1139 | /* map read fault as writable if possible */ | |
12ce13fe | 1140 | if (unlikely(!write_fault) && writable) { |
2fc84311 XG |
1141 | struct page *wpage[1]; |
1142 | ||
1143 | npages = __get_user_pages_fast(addr, 1, 1, wpage); | |
1144 | if (npages == 1) { | |
1145 | *writable = true; | |
1146 | put_page(page[0]); | |
1147 | page[0] = wpage[0]; | |
612819c3 | 1148 | } |
2fc84311 XG |
1149 | |
1150 | npages = 1; | |
887c08ac | 1151 | } |
2fc84311 XG |
1152 | *pfn = page_to_pfn(page[0]); |
1153 | return npages; | |
1154 | } | |
539cb660 | 1155 | |
4d8b81ab XG |
1156 | static bool vma_is_valid(struct vm_area_struct *vma, bool write_fault) |
1157 | { | |
1158 | if (unlikely(!(vma->vm_flags & VM_READ))) | |
1159 | return false; | |
2e2e3738 | 1160 | |
4d8b81ab XG |
1161 | if (write_fault && (unlikely(!(vma->vm_flags & VM_WRITE)))) |
1162 | return false; | |
887c08ac | 1163 | |
4d8b81ab XG |
1164 | return true; |
1165 | } | |
bf998156 | 1166 | |
12ce13fe XG |
1167 | /* |
1168 | * Pin guest page in memory and return its pfn. | |
1169 | * @addr: host virtual address which maps memory to the guest | |
1170 | * @atomic: whether this function can sleep | |
1171 | * @async: whether this function need to wait IO complete if the | |
1172 | * host page is not in the memory | |
1173 | * @write_fault: whether we should get a writable host page | |
1174 | * @writable: whether it allows to map a writable host page for !@write_fault | |
1175 | * | |
1176 | * The function will map a writable host page for these two cases: | |
1177 | * 1): @write_fault = true | |
1178 | * 2): @write_fault = false && @writable, @writable will tell the caller | |
1179 | * whether the mapping is writable. | |
1180 | */ | |
2fc84311 XG |
1181 | static pfn_t hva_to_pfn(unsigned long addr, bool atomic, bool *async, |
1182 | bool write_fault, bool *writable) | |
1183 | { | |
1184 | struct vm_area_struct *vma; | |
1185 | pfn_t pfn = 0; | |
1186 | int npages; | |
2e2e3738 | 1187 | |
2fc84311 XG |
1188 | /* we can do it either atomically or asynchronously, not both */ |
1189 | BUG_ON(atomic && async); | |
8d4e1288 | 1190 | |
2fc84311 XG |
1191 | if (hva_to_pfn_fast(addr, atomic, async, write_fault, writable, &pfn)) |
1192 | return pfn; | |
1193 | ||
1194 | if (atomic) | |
1195 | return KVM_PFN_ERR_FAULT; | |
1196 | ||
1197 | npages = hva_to_pfn_slow(addr, async, write_fault, writable, &pfn); | |
1198 | if (npages == 1) | |
1199 | return pfn; | |
8d4e1288 | 1200 | |
2fc84311 XG |
1201 | down_read(¤t->mm->mmap_sem); |
1202 | if (npages == -EHWPOISON || | |
1203 | (!async && check_user_page_hwpoison(addr))) { | |
1204 | pfn = KVM_PFN_ERR_HWPOISON; | |
1205 | goto exit; | |
1206 | } | |
1207 | ||
1208 | vma = find_vma_intersection(current->mm, addr, addr + 1); | |
1209 | ||
1210 | if (vma == NULL) | |
1211 | pfn = KVM_PFN_ERR_FAULT; | |
1212 | else if ((vma->vm_flags & VM_PFNMAP)) { | |
1213 | pfn = ((addr - vma->vm_start) >> PAGE_SHIFT) + | |
1214 | vma->vm_pgoff; | |
1215 | BUG_ON(!kvm_is_mmio_pfn(pfn)); | |
1216 | } else { | |
4d8b81ab | 1217 | if (async && vma_is_valid(vma, write_fault)) |
2fc84311 XG |
1218 | *async = true; |
1219 | pfn = KVM_PFN_ERR_FAULT; | |
1220 | } | |
1221 | exit: | |
1222 | up_read(¤t->mm->mmap_sem); | |
2e2e3738 | 1223 | return pfn; |
35149e21 AL |
1224 | } |
1225 | ||
4d8b81ab XG |
1226 | static pfn_t |
1227 | __gfn_to_pfn_memslot(struct kvm_memory_slot *slot, gfn_t gfn, bool atomic, | |
1228 | bool *async, bool write_fault, bool *writable) | |
887c08ac | 1229 | { |
4d8b81ab XG |
1230 | unsigned long addr = __gfn_to_hva_many(slot, gfn, NULL, write_fault); |
1231 | ||
1232 | if (addr == KVM_HVA_ERR_RO_BAD) | |
1233 | return KVM_PFN_ERR_RO_FAULT; | |
1234 | ||
1235 | if (kvm_is_error_hva(addr)) | |
81c52c56 | 1236 | return KVM_PFN_NOSLOT; |
4d8b81ab XG |
1237 | |
1238 | /* Do not map writable pfn in the readonly memslot. */ | |
1239 | if (writable && memslot_is_readonly(slot)) { | |
1240 | *writable = false; | |
1241 | writable = NULL; | |
1242 | } | |
1243 | ||
1244 | return hva_to_pfn(addr, atomic, async, write_fault, | |
1245 | writable); | |
887c08ac | 1246 | } |
887c08ac | 1247 | |
612819c3 MT |
1248 | static pfn_t __gfn_to_pfn(struct kvm *kvm, gfn_t gfn, bool atomic, bool *async, |
1249 | bool write_fault, bool *writable) | |
506f0d6f | 1250 | { |
4d8b81ab | 1251 | struct kvm_memory_slot *slot; |
506f0d6f | 1252 | |
af585b92 GN |
1253 | if (async) |
1254 | *async = false; | |
1255 | ||
4d8b81ab | 1256 | slot = gfn_to_memslot(kvm, gfn); |
506f0d6f | 1257 | |
4d8b81ab XG |
1258 | return __gfn_to_pfn_memslot(slot, gfn, atomic, async, write_fault, |
1259 | writable); | |
365fb3fd XG |
1260 | } |
1261 | ||
1262 | pfn_t gfn_to_pfn_atomic(struct kvm *kvm, gfn_t gfn) | |
1263 | { | |
612819c3 | 1264 | return __gfn_to_pfn(kvm, gfn, true, NULL, true, NULL); |
365fb3fd XG |
1265 | } |
1266 | EXPORT_SYMBOL_GPL(gfn_to_pfn_atomic); | |
1267 | ||
612819c3 MT |
1268 | pfn_t gfn_to_pfn_async(struct kvm *kvm, gfn_t gfn, bool *async, |
1269 | bool write_fault, bool *writable) | |
af585b92 | 1270 | { |
612819c3 | 1271 | return __gfn_to_pfn(kvm, gfn, false, async, write_fault, writable); |
af585b92 GN |
1272 | } |
1273 | EXPORT_SYMBOL_GPL(gfn_to_pfn_async); | |
1274 | ||
365fb3fd XG |
1275 | pfn_t gfn_to_pfn(struct kvm *kvm, gfn_t gfn) |
1276 | { | |
612819c3 | 1277 | return __gfn_to_pfn(kvm, gfn, false, NULL, true, NULL); |
506f0d6f | 1278 | } |
35149e21 AL |
1279 | EXPORT_SYMBOL_GPL(gfn_to_pfn); |
1280 | ||
612819c3 MT |
1281 | pfn_t gfn_to_pfn_prot(struct kvm *kvm, gfn_t gfn, bool write_fault, |
1282 | bool *writable) | |
1283 | { | |
1284 | return __gfn_to_pfn(kvm, gfn, false, NULL, write_fault, writable); | |
1285 | } | |
1286 | EXPORT_SYMBOL_GPL(gfn_to_pfn_prot); | |
1287 | ||
d5661048 | 1288 | pfn_t gfn_to_pfn_memslot(struct kvm_memory_slot *slot, gfn_t gfn) |
506f0d6f | 1289 | { |
4d8b81ab | 1290 | return __gfn_to_pfn_memslot(slot, gfn, false, NULL, true, NULL); |
506f0d6f MT |
1291 | } |
1292 | ||
037d92dc | 1293 | pfn_t gfn_to_pfn_memslot_atomic(struct kvm_memory_slot *slot, gfn_t gfn) |
506f0d6f | 1294 | { |
4d8b81ab | 1295 | return __gfn_to_pfn_memslot(slot, gfn, true, NULL, true, NULL); |
506f0d6f | 1296 | } |
037d92dc | 1297 | EXPORT_SYMBOL_GPL(gfn_to_pfn_memslot_atomic); |
506f0d6f | 1298 | |
48987781 XG |
1299 | int gfn_to_page_many_atomic(struct kvm *kvm, gfn_t gfn, struct page **pages, |
1300 | int nr_pages) | |
1301 | { | |
1302 | unsigned long addr; | |
1303 | gfn_t entry; | |
1304 | ||
49c7754c | 1305 | addr = gfn_to_hva_many(gfn_to_memslot(kvm, gfn), gfn, &entry); |
48987781 XG |
1306 | if (kvm_is_error_hva(addr)) |
1307 | return -1; | |
1308 | ||
1309 | if (entry < nr_pages) | |
1310 | return 0; | |
1311 | ||
1312 | return __get_user_pages_fast(addr, nr_pages, 1, pages); | |
1313 | } | |
1314 | EXPORT_SYMBOL_GPL(gfn_to_page_many_atomic); | |
1315 | ||
a2766325 XG |
1316 | static struct page *kvm_pfn_to_page(pfn_t pfn) |
1317 | { | |
81c52c56 | 1318 | if (is_error_noslot_pfn(pfn)) |
cb9aaa30 | 1319 | return KVM_ERR_PTR_BAD_PAGE; |
a2766325 | 1320 | |
cb9aaa30 XG |
1321 | if (kvm_is_mmio_pfn(pfn)) { |
1322 | WARN_ON(1); | |
6cede2e6 | 1323 | return KVM_ERR_PTR_BAD_PAGE; |
cb9aaa30 | 1324 | } |
a2766325 XG |
1325 | |
1326 | return pfn_to_page(pfn); | |
1327 | } | |
1328 | ||
35149e21 AL |
1329 | struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn) |
1330 | { | |
2e2e3738 AL |
1331 | pfn_t pfn; |
1332 | ||
1333 | pfn = gfn_to_pfn(kvm, gfn); | |
2e2e3738 | 1334 | |
a2766325 | 1335 | return kvm_pfn_to_page(pfn); |
954bbbc2 | 1336 | } |
aab61cc0 | 1337 | |
954bbbc2 AK |
1338 | EXPORT_SYMBOL_GPL(gfn_to_page); |
1339 | ||
b4231d61 IE |
1340 | void kvm_release_page_clean(struct page *page) |
1341 | { | |
32cad84f XG |
1342 | WARN_ON(is_error_page(page)); |
1343 | ||
35149e21 | 1344 | kvm_release_pfn_clean(page_to_pfn(page)); |
b4231d61 IE |
1345 | } |
1346 | EXPORT_SYMBOL_GPL(kvm_release_page_clean); | |
1347 | ||
35149e21 AL |
1348 | void kvm_release_pfn_clean(pfn_t pfn) |
1349 | { | |
81c52c56 | 1350 | if (!is_error_noslot_pfn(pfn) && !kvm_is_mmio_pfn(pfn)) |
2e2e3738 | 1351 | put_page(pfn_to_page(pfn)); |
35149e21 AL |
1352 | } |
1353 | EXPORT_SYMBOL_GPL(kvm_release_pfn_clean); | |
1354 | ||
b4231d61 | 1355 | void kvm_release_page_dirty(struct page *page) |
8a7ae055 | 1356 | { |
a2766325 XG |
1357 | WARN_ON(is_error_page(page)); |
1358 | ||
35149e21 AL |
1359 | kvm_release_pfn_dirty(page_to_pfn(page)); |
1360 | } | |
1361 | EXPORT_SYMBOL_GPL(kvm_release_page_dirty); | |
1362 | ||
1363 | void kvm_release_pfn_dirty(pfn_t pfn) | |
1364 | { | |
1365 | kvm_set_pfn_dirty(pfn); | |
1366 | kvm_release_pfn_clean(pfn); | |
1367 | } | |
1368 | EXPORT_SYMBOL_GPL(kvm_release_pfn_dirty); | |
1369 | ||
1370 | void kvm_set_page_dirty(struct page *page) | |
1371 | { | |
1372 | kvm_set_pfn_dirty(page_to_pfn(page)); | |
1373 | } | |
1374 | EXPORT_SYMBOL_GPL(kvm_set_page_dirty); | |
1375 | ||
1376 | void kvm_set_pfn_dirty(pfn_t pfn) | |
1377 | { | |
c77fb9dc | 1378 | if (!kvm_is_mmio_pfn(pfn)) { |
2e2e3738 AL |
1379 | struct page *page = pfn_to_page(pfn); |
1380 | if (!PageReserved(page)) | |
1381 | SetPageDirty(page); | |
1382 | } | |
8a7ae055 | 1383 | } |
35149e21 AL |
1384 | EXPORT_SYMBOL_GPL(kvm_set_pfn_dirty); |
1385 | ||
1386 | void kvm_set_pfn_accessed(pfn_t pfn) | |
1387 | { | |
c77fb9dc | 1388 | if (!kvm_is_mmio_pfn(pfn)) |
2e2e3738 | 1389 | mark_page_accessed(pfn_to_page(pfn)); |
35149e21 AL |
1390 | } |
1391 | EXPORT_SYMBOL_GPL(kvm_set_pfn_accessed); | |
1392 | ||
1393 | void kvm_get_pfn(pfn_t pfn) | |
1394 | { | |
c77fb9dc | 1395 | if (!kvm_is_mmio_pfn(pfn)) |
2e2e3738 | 1396 | get_page(pfn_to_page(pfn)); |
35149e21 AL |
1397 | } |
1398 | EXPORT_SYMBOL_GPL(kvm_get_pfn); | |
8a7ae055 | 1399 | |
195aefde IE |
1400 | static int next_segment(unsigned long len, int offset) |
1401 | { | |
1402 | if (len > PAGE_SIZE - offset) | |
1403 | return PAGE_SIZE - offset; | |
1404 | else | |
1405 | return len; | |
1406 | } | |
1407 | ||
1408 | int kvm_read_guest_page(struct kvm *kvm, gfn_t gfn, void *data, int offset, | |
1409 | int len) | |
1410 | { | |
e0506bcb IE |
1411 | int r; |
1412 | unsigned long addr; | |
195aefde | 1413 | |
86ab8cff | 1414 | addr = gfn_to_hva_read(kvm, gfn); |
e0506bcb IE |
1415 | if (kvm_is_error_hva(addr)) |
1416 | return -EFAULT; | |
86ab8cff | 1417 | r = kvm_read_hva(data, (void __user *)addr + offset, len); |
e0506bcb | 1418 | if (r) |
195aefde | 1419 | return -EFAULT; |
195aefde IE |
1420 | return 0; |
1421 | } | |
1422 | EXPORT_SYMBOL_GPL(kvm_read_guest_page); | |
1423 | ||
1424 | int kvm_read_guest(struct kvm *kvm, gpa_t gpa, void *data, unsigned long len) | |
1425 | { | |
1426 | gfn_t gfn = gpa >> PAGE_SHIFT; | |
1427 | int seg; | |
1428 | int offset = offset_in_page(gpa); | |
1429 | int ret; | |
1430 | ||
1431 | while ((seg = next_segment(len, offset)) != 0) { | |
1432 | ret = kvm_read_guest_page(kvm, gfn, data, offset, seg); | |
1433 | if (ret < 0) | |
1434 | return ret; | |
1435 | offset = 0; | |
1436 | len -= seg; | |
1437 | data += seg; | |
1438 | ++gfn; | |
1439 | } | |
1440 | return 0; | |
1441 | } | |
1442 | EXPORT_SYMBOL_GPL(kvm_read_guest); | |
1443 | ||
7ec54588 MT |
1444 | int kvm_read_guest_atomic(struct kvm *kvm, gpa_t gpa, void *data, |
1445 | unsigned long len) | |
1446 | { | |
1447 | int r; | |
1448 | unsigned long addr; | |
1449 | gfn_t gfn = gpa >> PAGE_SHIFT; | |
1450 | int offset = offset_in_page(gpa); | |
1451 | ||
86ab8cff | 1452 | addr = gfn_to_hva_read(kvm, gfn); |
7ec54588 MT |
1453 | if (kvm_is_error_hva(addr)) |
1454 | return -EFAULT; | |
0aac03f0 | 1455 | pagefault_disable(); |
86ab8cff | 1456 | r = kvm_read_hva_atomic(data, (void __user *)addr + offset, len); |
0aac03f0 | 1457 | pagefault_enable(); |
7ec54588 MT |
1458 | if (r) |
1459 | return -EFAULT; | |
1460 | return 0; | |
1461 | } | |
1462 | EXPORT_SYMBOL(kvm_read_guest_atomic); | |
1463 | ||
195aefde IE |
1464 | int kvm_write_guest_page(struct kvm *kvm, gfn_t gfn, const void *data, |
1465 | int offset, int len) | |
1466 | { | |
e0506bcb IE |
1467 | int r; |
1468 | unsigned long addr; | |
195aefde | 1469 | |
e0506bcb IE |
1470 | addr = gfn_to_hva(kvm, gfn); |
1471 | if (kvm_is_error_hva(addr)) | |
1472 | return -EFAULT; | |
8b0cedff | 1473 | r = __copy_to_user((void __user *)addr + offset, data, len); |
e0506bcb | 1474 | if (r) |
195aefde | 1475 | return -EFAULT; |
195aefde IE |
1476 | mark_page_dirty(kvm, gfn); |
1477 | return 0; | |
1478 | } | |
1479 | EXPORT_SYMBOL_GPL(kvm_write_guest_page); | |
1480 | ||
1481 | int kvm_write_guest(struct kvm *kvm, gpa_t gpa, const void *data, | |
1482 | unsigned long len) | |
1483 | { | |
1484 | gfn_t gfn = gpa >> PAGE_SHIFT; | |
1485 | int seg; | |
1486 | int offset = offset_in_page(gpa); | |
1487 | int ret; | |
1488 | ||
1489 | while ((seg = next_segment(len, offset)) != 0) { | |
1490 | ret = kvm_write_guest_page(kvm, gfn, data, offset, seg); | |
1491 | if (ret < 0) | |
1492 | return ret; | |
1493 | offset = 0; | |
1494 | len -= seg; | |
1495 | data += seg; | |
1496 | ++gfn; | |
1497 | } | |
1498 | return 0; | |
1499 | } | |
1500 | ||
49c7754c GN |
1501 | int kvm_gfn_to_hva_cache_init(struct kvm *kvm, struct gfn_to_hva_cache *ghc, |
1502 | gpa_t gpa) | |
1503 | { | |
1504 | struct kvm_memslots *slots = kvm_memslots(kvm); | |
1505 | int offset = offset_in_page(gpa); | |
1506 | gfn_t gfn = gpa >> PAGE_SHIFT; | |
1507 | ||
1508 | ghc->gpa = gpa; | |
1509 | ghc->generation = slots->generation; | |
9d4cba7f | 1510 | ghc->memslot = gfn_to_memslot(kvm, gfn); |
49c7754c GN |
1511 | ghc->hva = gfn_to_hva_many(ghc->memslot, gfn, NULL); |
1512 | if (!kvm_is_error_hva(ghc->hva)) | |
1513 | ghc->hva += offset; | |
1514 | else | |
1515 | return -EFAULT; | |
1516 | ||
1517 | return 0; | |
1518 | } | |
1519 | EXPORT_SYMBOL_GPL(kvm_gfn_to_hva_cache_init); | |
1520 | ||
1521 | int kvm_write_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc, | |
1522 | void *data, unsigned long len) | |
1523 | { | |
1524 | struct kvm_memslots *slots = kvm_memslots(kvm); | |
1525 | int r; | |
1526 | ||
1527 | if (slots->generation != ghc->generation) | |
1528 | kvm_gfn_to_hva_cache_init(kvm, ghc, ghc->gpa); | |
1529 | ||
1530 | if (kvm_is_error_hva(ghc->hva)) | |
1531 | return -EFAULT; | |
1532 | ||
8b0cedff | 1533 | r = __copy_to_user((void __user *)ghc->hva, data, len); |
49c7754c GN |
1534 | if (r) |
1535 | return -EFAULT; | |
1536 | mark_page_dirty_in_slot(kvm, ghc->memslot, ghc->gpa >> PAGE_SHIFT); | |
1537 | ||
1538 | return 0; | |
1539 | } | |
1540 | EXPORT_SYMBOL_GPL(kvm_write_guest_cached); | |
1541 | ||
e03b644f GN |
1542 | int kvm_read_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc, |
1543 | void *data, unsigned long len) | |
1544 | { | |
1545 | struct kvm_memslots *slots = kvm_memslots(kvm); | |
1546 | int r; | |
1547 | ||
1548 | if (slots->generation != ghc->generation) | |
1549 | kvm_gfn_to_hva_cache_init(kvm, ghc, ghc->gpa); | |
1550 | ||
1551 | if (kvm_is_error_hva(ghc->hva)) | |
1552 | return -EFAULT; | |
1553 | ||
1554 | r = __copy_from_user(data, (void __user *)ghc->hva, len); | |
1555 | if (r) | |
1556 | return -EFAULT; | |
1557 | ||
1558 | return 0; | |
1559 | } | |
1560 | EXPORT_SYMBOL_GPL(kvm_read_guest_cached); | |
1561 | ||
195aefde IE |
1562 | int kvm_clear_guest_page(struct kvm *kvm, gfn_t gfn, int offset, int len) |
1563 | { | |
3bcc8a8c HC |
1564 | return kvm_write_guest_page(kvm, gfn, (const void *) empty_zero_page, |
1565 | offset, len); | |
195aefde IE |
1566 | } |
1567 | EXPORT_SYMBOL_GPL(kvm_clear_guest_page); | |
1568 | ||
1569 | int kvm_clear_guest(struct kvm *kvm, gpa_t gpa, unsigned long len) | |
1570 | { | |
1571 | gfn_t gfn = gpa >> PAGE_SHIFT; | |
1572 | int seg; | |
1573 | int offset = offset_in_page(gpa); | |
1574 | int ret; | |
1575 | ||
1576 | while ((seg = next_segment(len, offset)) != 0) { | |
1577 | ret = kvm_clear_guest_page(kvm, gfn, offset, seg); | |
1578 | if (ret < 0) | |
1579 | return ret; | |
1580 | offset = 0; | |
1581 | len -= seg; | |
1582 | ++gfn; | |
1583 | } | |
1584 | return 0; | |
1585 | } | |
1586 | EXPORT_SYMBOL_GPL(kvm_clear_guest); | |
1587 | ||
49c7754c GN |
1588 | void mark_page_dirty_in_slot(struct kvm *kvm, struct kvm_memory_slot *memslot, |
1589 | gfn_t gfn) | |
6aa8b732 | 1590 | { |
7e9d619d RR |
1591 | if (memslot && memslot->dirty_bitmap) { |
1592 | unsigned long rel_gfn = gfn - memslot->base_gfn; | |
6aa8b732 | 1593 | |
b74ca3b3 | 1594 | set_bit_le(rel_gfn, memslot->dirty_bitmap); |
6aa8b732 AK |
1595 | } |
1596 | } | |
1597 | ||
49c7754c GN |
1598 | void mark_page_dirty(struct kvm *kvm, gfn_t gfn) |
1599 | { | |
1600 | struct kvm_memory_slot *memslot; | |
1601 | ||
1602 | memslot = gfn_to_memslot(kvm, gfn); | |
1603 | mark_page_dirty_in_slot(kvm, memslot, gfn); | |
1604 | } | |
1605 | ||
b6958ce4 ED |
1606 | /* |
1607 | * The vCPU has executed a HLT instruction with in-kernel mode enabled. | |
1608 | */ | |
8776e519 | 1609 | void kvm_vcpu_block(struct kvm_vcpu *vcpu) |
d3bef15f | 1610 | { |
e5c239cf MT |
1611 | DEFINE_WAIT(wait); |
1612 | ||
1613 | for (;;) { | |
1614 | prepare_to_wait(&vcpu->wq, &wait, TASK_INTERRUPTIBLE); | |
1615 | ||
a1b37100 | 1616 | if (kvm_arch_vcpu_runnable(vcpu)) { |
a8eeb04a | 1617 | kvm_make_request(KVM_REQ_UNHALT, vcpu); |
e5c239cf | 1618 | break; |
d7690175 | 1619 | } |
09cec754 GN |
1620 | if (kvm_cpu_has_pending_timer(vcpu)) |
1621 | break; | |
e5c239cf MT |
1622 | if (signal_pending(current)) |
1623 | break; | |
1624 | ||
b6958ce4 | 1625 | schedule(); |
b6958ce4 | 1626 | } |
d3bef15f | 1627 | |
e5c239cf | 1628 | finish_wait(&vcpu->wq, &wait); |
b6958ce4 ED |
1629 | } |
1630 | ||
8c84780d | 1631 | #ifndef CONFIG_S390 |
b6d33834 CD |
1632 | /* |
1633 | * Kick a sleeping VCPU, or a guest VCPU in guest mode, into host kernel mode. | |
1634 | */ | |
1635 | void kvm_vcpu_kick(struct kvm_vcpu *vcpu) | |
1636 | { | |
1637 | int me; | |
1638 | int cpu = vcpu->cpu; | |
1639 | wait_queue_head_t *wqp; | |
1640 | ||
1641 | wqp = kvm_arch_vcpu_wq(vcpu); | |
1642 | if (waitqueue_active(wqp)) { | |
1643 | wake_up_interruptible(wqp); | |
1644 | ++vcpu->stat.halt_wakeup; | |
1645 | } | |
1646 | ||
1647 | me = get_cpu(); | |
1648 | if (cpu != me && (unsigned)cpu < nr_cpu_ids && cpu_online(cpu)) | |
1649 | if (kvm_arch_vcpu_should_kick(vcpu)) | |
1650 | smp_send_reschedule(cpu); | |
1651 | put_cpu(); | |
1652 | } | |
8c84780d | 1653 | #endif /* !CONFIG_S390 */ |
b6d33834 | 1654 | |
6aa8b732 AK |
1655 | void kvm_resched(struct kvm_vcpu *vcpu) |
1656 | { | |
3fca0365 YD |
1657 | if (!need_resched()) |
1658 | return; | |
6aa8b732 | 1659 | cond_resched(); |
6aa8b732 AK |
1660 | } |
1661 | EXPORT_SYMBOL_GPL(kvm_resched); | |
1662 | ||
41628d33 KW |
1663 | bool kvm_vcpu_yield_to(struct kvm_vcpu *target) |
1664 | { | |
1665 | struct pid *pid; | |
1666 | struct task_struct *task = NULL; | |
1667 | ||
1668 | rcu_read_lock(); | |
1669 | pid = rcu_dereference(target->pid); | |
1670 | if (pid) | |
1671 | task = get_pid_task(target->pid, PIDTYPE_PID); | |
1672 | rcu_read_unlock(); | |
1673 | if (!task) | |
1674 | return false; | |
1675 | if (task->flags & PF_VCPU) { | |
1676 | put_task_struct(task); | |
1677 | return false; | |
1678 | } | |
1679 | if (yield_to(task, 1)) { | |
1680 | put_task_struct(task); | |
1681 | return true; | |
1682 | } | |
1683 | put_task_struct(task); | |
1684 | return false; | |
1685 | } | |
1686 | EXPORT_SYMBOL_GPL(kvm_vcpu_yield_to); | |
1687 | ||
06e48c51 R |
1688 | #ifdef CONFIG_HAVE_KVM_CPU_RELAX_INTERCEPT |
1689 | /* | |
1690 | * Helper that checks whether a VCPU is eligible for directed yield. | |
1691 | * Most eligible candidate to yield is decided by following heuristics: | |
1692 | * | |
1693 | * (a) VCPU which has not done pl-exit or cpu relax intercepted recently | |
1694 | * (preempted lock holder), indicated by @in_spin_loop. | |
1695 | * Set at the beiginning and cleared at the end of interception/PLE handler. | |
1696 | * | |
1697 | * (b) VCPU which has done pl-exit/ cpu relax intercepted but did not get | |
1698 | * chance last time (mostly it has become eligible now since we have probably | |
1699 | * yielded to lockholder in last iteration. This is done by toggling | |
1700 | * @dy_eligible each time a VCPU checked for eligibility.) | |
1701 | * | |
1702 | * Yielding to a recently pl-exited/cpu relax intercepted VCPU before yielding | |
1703 | * to preempted lock-holder could result in wrong VCPU selection and CPU | |
1704 | * burning. Giving priority for a potential lock-holder increases lock | |
1705 | * progress. | |
1706 | * | |
1707 | * Since algorithm is based on heuristics, accessing another VCPU data without | |
1708 | * locking does not harm. It may result in trying to yield to same VCPU, fail | |
1709 | * and continue with next VCPU and so on. | |
1710 | */ | |
1711 | bool kvm_vcpu_eligible_for_directed_yield(struct kvm_vcpu *vcpu) | |
1712 | { | |
1713 | bool eligible; | |
1714 | ||
1715 | eligible = !vcpu->spin_loop.in_spin_loop || | |
1716 | (vcpu->spin_loop.in_spin_loop && | |
1717 | vcpu->spin_loop.dy_eligible); | |
1718 | ||
1719 | if (vcpu->spin_loop.in_spin_loop) | |
1720 | kvm_vcpu_set_dy_eligible(vcpu, !vcpu->spin_loop.dy_eligible); | |
1721 | ||
1722 | return eligible; | |
1723 | } | |
1724 | #endif | |
217ece61 | 1725 | void kvm_vcpu_on_spin(struct kvm_vcpu *me) |
d255f4f2 | 1726 | { |
217ece61 RR |
1727 | struct kvm *kvm = me->kvm; |
1728 | struct kvm_vcpu *vcpu; | |
1729 | int last_boosted_vcpu = me->kvm->last_boosted_vcpu; | |
1730 | int yielded = 0; | |
1731 | int pass; | |
1732 | int i; | |
d255f4f2 | 1733 | |
4c088493 | 1734 | kvm_vcpu_set_in_spin_loop(me, true); |
217ece61 RR |
1735 | /* |
1736 | * We boost the priority of a VCPU that is runnable but not | |
1737 | * currently running, because it got preempted by something | |
1738 | * else and called schedule in __vcpu_run. Hopefully that | |
1739 | * VCPU is holding the lock that we need and will release it. | |
1740 | * We approximate round-robin by starting at the last boosted VCPU. | |
1741 | */ | |
1742 | for (pass = 0; pass < 2 && !yielded; pass++) { | |
1743 | kvm_for_each_vcpu(i, vcpu, kvm) { | |
5cfc2aab | 1744 | if (!pass && i <= last_boosted_vcpu) { |
217ece61 RR |
1745 | i = last_boosted_vcpu; |
1746 | continue; | |
1747 | } else if (pass && i > last_boosted_vcpu) | |
1748 | break; | |
1749 | if (vcpu == me) | |
1750 | continue; | |
1751 | if (waitqueue_active(&vcpu->wq)) | |
1752 | continue; | |
06e48c51 R |
1753 | if (!kvm_vcpu_eligible_for_directed_yield(vcpu)) |
1754 | continue; | |
41628d33 | 1755 | if (kvm_vcpu_yield_to(vcpu)) { |
217ece61 RR |
1756 | kvm->last_boosted_vcpu = i; |
1757 | yielded = 1; | |
1758 | break; | |
1759 | } | |
217ece61 RR |
1760 | } |
1761 | } | |
4c088493 | 1762 | kvm_vcpu_set_in_spin_loop(me, false); |
06e48c51 R |
1763 | |
1764 | /* Ensure vcpu is not eligible during next spinloop */ | |
1765 | kvm_vcpu_set_dy_eligible(me, false); | |
d255f4f2 ZE |
1766 | } |
1767 | EXPORT_SYMBOL_GPL(kvm_vcpu_on_spin); | |
1768 | ||
e4a533a4 | 1769 | static int kvm_vcpu_fault(struct vm_area_struct *vma, struct vm_fault *vmf) |
9a2bb7f4 AK |
1770 | { |
1771 | struct kvm_vcpu *vcpu = vma->vm_file->private_data; | |
9a2bb7f4 AK |
1772 | struct page *page; |
1773 | ||
e4a533a4 | 1774 | if (vmf->pgoff == 0) |
039576c0 | 1775 | page = virt_to_page(vcpu->run); |
09566765 | 1776 | #ifdef CONFIG_X86 |
e4a533a4 | 1777 | else if (vmf->pgoff == KVM_PIO_PAGE_OFFSET) |
ad312c7c | 1778 | page = virt_to_page(vcpu->arch.pio_data); |
5f94c174 LV |
1779 | #endif |
1780 | #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET | |
1781 | else if (vmf->pgoff == KVM_COALESCED_MMIO_PAGE_OFFSET) | |
1782 | page = virt_to_page(vcpu->kvm->coalesced_mmio_ring); | |
09566765 | 1783 | #endif |
039576c0 | 1784 | else |
5b1c1493 | 1785 | return kvm_arch_vcpu_fault(vcpu, vmf); |
9a2bb7f4 | 1786 | get_page(page); |
e4a533a4 NP |
1787 | vmf->page = page; |
1788 | return 0; | |
9a2bb7f4 AK |
1789 | } |
1790 | ||
f0f37e2f | 1791 | static const struct vm_operations_struct kvm_vcpu_vm_ops = { |
e4a533a4 | 1792 | .fault = kvm_vcpu_fault, |
9a2bb7f4 AK |
1793 | }; |
1794 | ||
1795 | static int kvm_vcpu_mmap(struct file *file, struct vm_area_struct *vma) | |
1796 | { | |
1797 | vma->vm_ops = &kvm_vcpu_vm_ops; | |
1798 | return 0; | |
1799 | } | |
1800 | ||
bccf2150 AK |
1801 | static int kvm_vcpu_release(struct inode *inode, struct file *filp) |
1802 | { | |
1803 | struct kvm_vcpu *vcpu = filp->private_data; | |
1804 | ||
66c0b394 | 1805 | kvm_put_kvm(vcpu->kvm); |
bccf2150 AK |
1806 | return 0; |
1807 | } | |
1808 | ||
3d3aab1b | 1809 | static struct file_operations kvm_vcpu_fops = { |
bccf2150 AK |
1810 | .release = kvm_vcpu_release, |
1811 | .unlocked_ioctl = kvm_vcpu_ioctl, | |
1dda606c AG |
1812 | #ifdef CONFIG_COMPAT |
1813 | .compat_ioctl = kvm_vcpu_compat_ioctl, | |
1814 | #endif | |
9a2bb7f4 | 1815 | .mmap = kvm_vcpu_mmap, |
6038f373 | 1816 | .llseek = noop_llseek, |
bccf2150 AK |
1817 | }; |
1818 | ||
1819 | /* | |
1820 | * Allocates an inode for the vcpu. | |
1821 | */ | |
1822 | static int create_vcpu_fd(struct kvm_vcpu *vcpu) | |
1823 | { | |
628ff7c1 | 1824 | return anon_inode_getfd("kvm-vcpu", &kvm_vcpu_fops, vcpu, O_RDWR); |
bccf2150 AK |
1825 | } |
1826 | ||
c5ea7660 AK |
1827 | /* |
1828 | * Creates some virtual cpus. Good luck creating more than one. | |
1829 | */ | |
73880c80 | 1830 | static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, u32 id) |
c5ea7660 AK |
1831 | { |
1832 | int r; | |
988a2cae | 1833 | struct kvm_vcpu *vcpu, *v; |
c5ea7660 | 1834 | |
73880c80 | 1835 | vcpu = kvm_arch_vcpu_create(kvm, id); |
fb3f0f51 RR |
1836 | if (IS_ERR(vcpu)) |
1837 | return PTR_ERR(vcpu); | |
c5ea7660 | 1838 | |
15ad7146 AK |
1839 | preempt_notifier_init(&vcpu->preempt_notifier, &kvm_preempt_ops); |
1840 | ||
26e5215f AK |
1841 | r = kvm_arch_vcpu_setup(vcpu); |
1842 | if (r) | |
d780592b | 1843 | goto vcpu_destroy; |
26e5215f | 1844 | |
11ec2804 | 1845 | mutex_lock(&kvm->lock); |
3e515705 AK |
1846 | if (!kvm_vcpu_compatible(vcpu)) { |
1847 | r = -EINVAL; | |
1848 | goto unlock_vcpu_destroy; | |
1849 | } | |
73880c80 GN |
1850 | if (atomic_read(&kvm->online_vcpus) == KVM_MAX_VCPUS) { |
1851 | r = -EINVAL; | |
d780592b | 1852 | goto unlock_vcpu_destroy; |
fb3f0f51 | 1853 | } |
73880c80 | 1854 | |
988a2cae GN |
1855 | kvm_for_each_vcpu(r, v, kvm) |
1856 | if (v->vcpu_id == id) { | |
73880c80 | 1857 | r = -EEXIST; |
d780592b | 1858 | goto unlock_vcpu_destroy; |
73880c80 GN |
1859 | } |
1860 | ||
1861 | BUG_ON(kvm->vcpus[atomic_read(&kvm->online_vcpus)]); | |
c5ea7660 | 1862 | |
fb3f0f51 | 1863 | /* Now it's all set up, let userspace reach it */ |
66c0b394 | 1864 | kvm_get_kvm(kvm); |
bccf2150 | 1865 | r = create_vcpu_fd(vcpu); |
73880c80 GN |
1866 | if (r < 0) { |
1867 | kvm_put_kvm(kvm); | |
d780592b | 1868 | goto unlock_vcpu_destroy; |
73880c80 GN |
1869 | } |
1870 | ||
1871 | kvm->vcpus[atomic_read(&kvm->online_vcpus)] = vcpu; | |
1872 | smp_wmb(); | |
1873 | atomic_inc(&kvm->online_vcpus); | |
1874 | ||
73880c80 | 1875 | mutex_unlock(&kvm->lock); |
42897d86 | 1876 | kvm_arch_vcpu_postcreate(vcpu); |
fb3f0f51 | 1877 | return r; |
39c3b86e | 1878 | |
d780592b | 1879 | unlock_vcpu_destroy: |
7d8fece6 | 1880 | mutex_unlock(&kvm->lock); |
d780592b | 1881 | vcpu_destroy: |
d40ccc62 | 1882 | kvm_arch_vcpu_destroy(vcpu); |
c5ea7660 AK |
1883 | return r; |
1884 | } | |
1885 | ||
1961d276 AK |
1886 | static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu *vcpu, sigset_t *sigset) |
1887 | { | |
1888 | if (sigset) { | |
1889 | sigdelsetmask(sigset, sigmask(SIGKILL)|sigmask(SIGSTOP)); | |
1890 | vcpu->sigset_active = 1; | |
1891 | vcpu->sigset = *sigset; | |
1892 | } else | |
1893 | vcpu->sigset_active = 0; | |
1894 | return 0; | |
1895 | } | |
1896 | ||
bccf2150 AK |
1897 | static long kvm_vcpu_ioctl(struct file *filp, |
1898 | unsigned int ioctl, unsigned long arg) | |
6aa8b732 | 1899 | { |
bccf2150 | 1900 | struct kvm_vcpu *vcpu = filp->private_data; |
2f366987 | 1901 | void __user *argp = (void __user *)arg; |
313a3dc7 | 1902 | int r; |
fa3795a7 DH |
1903 | struct kvm_fpu *fpu = NULL; |
1904 | struct kvm_sregs *kvm_sregs = NULL; | |
6aa8b732 | 1905 | |
6d4e4c4f AK |
1906 | if (vcpu->kvm->mm != current->mm) |
1907 | return -EIO; | |
2122ff5e AK |
1908 | |
1909 | #if defined(CONFIG_S390) || defined(CONFIG_PPC) | |
1910 | /* | |
1911 | * Special cases: vcpu ioctls that are asynchronous to vcpu execution, | |
1912 | * so vcpu_load() would break it. | |
1913 | */ | |
1914 | if (ioctl == KVM_S390_INTERRUPT || ioctl == KVM_INTERRUPT) | |
1915 | return kvm_arch_vcpu_ioctl(filp, ioctl, arg); | |
1916 | #endif | |
1917 | ||
1918 | ||
9fc77441 MT |
1919 | r = vcpu_load(vcpu); |
1920 | if (r) | |
1921 | return r; | |
6aa8b732 | 1922 | switch (ioctl) { |
9a2bb7f4 | 1923 | case KVM_RUN: |
f0fe5108 AK |
1924 | r = -EINVAL; |
1925 | if (arg) | |
1926 | goto out; | |
b6c7a5dc | 1927 | r = kvm_arch_vcpu_ioctl_run(vcpu, vcpu->run); |
64be5007 | 1928 | trace_kvm_userspace_exit(vcpu->run->exit_reason, r); |
6aa8b732 | 1929 | break; |
6aa8b732 | 1930 | case KVM_GET_REGS: { |
3e4bb3ac | 1931 | struct kvm_regs *kvm_regs; |
6aa8b732 | 1932 | |
3e4bb3ac XZ |
1933 | r = -ENOMEM; |
1934 | kvm_regs = kzalloc(sizeof(struct kvm_regs), GFP_KERNEL); | |
1935 | if (!kvm_regs) | |
6aa8b732 | 1936 | goto out; |
3e4bb3ac XZ |
1937 | r = kvm_arch_vcpu_ioctl_get_regs(vcpu, kvm_regs); |
1938 | if (r) | |
1939 | goto out_free1; | |
6aa8b732 | 1940 | r = -EFAULT; |
3e4bb3ac XZ |
1941 | if (copy_to_user(argp, kvm_regs, sizeof(struct kvm_regs))) |
1942 | goto out_free1; | |
6aa8b732 | 1943 | r = 0; |
3e4bb3ac XZ |
1944 | out_free1: |
1945 | kfree(kvm_regs); | |
6aa8b732 AK |
1946 | break; |
1947 | } | |
1948 | case KVM_SET_REGS: { | |
3e4bb3ac | 1949 | struct kvm_regs *kvm_regs; |
6aa8b732 | 1950 | |
3e4bb3ac | 1951 | r = -ENOMEM; |
ff5c2c03 SL |
1952 | kvm_regs = memdup_user(argp, sizeof(*kvm_regs)); |
1953 | if (IS_ERR(kvm_regs)) { | |
1954 | r = PTR_ERR(kvm_regs); | |
6aa8b732 | 1955 | goto out; |
ff5c2c03 | 1956 | } |
3e4bb3ac | 1957 | r = kvm_arch_vcpu_ioctl_set_regs(vcpu, kvm_regs); |
3e4bb3ac | 1958 | kfree(kvm_regs); |
6aa8b732 AK |
1959 | break; |
1960 | } | |
1961 | case KVM_GET_SREGS: { | |
fa3795a7 DH |
1962 | kvm_sregs = kzalloc(sizeof(struct kvm_sregs), GFP_KERNEL); |
1963 | r = -ENOMEM; | |
1964 | if (!kvm_sregs) | |
1965 | goto out; | |
1966 | r = kvm_arch_vcpu_ioctl_get_sregs(vcpu, kvm_sregs); | |
6aa8b732 AK |
1967 | if (r) |
1968 | goto out; | |
1969 | r = -EFAULT; | |
fa3795a7 | 1970 | if (copy_to_user(argp, kvm_sregs, sizeof(struct kvm_sregs))) |
6aa8b732 AK |
1971 | goto out; |
1972 | r = 0; | |
1973 | break; | |
1974 | } | |
1975 | case KVM_SET_SREGS: { | |
ff5c2c03 SL |
1976 | kvm_sregs = memdup_user(argp, sizeof(*kvm_sregs)); |
1977 | if (IS_ERR(kvm_sregs)) { | |
1978 | r = PTR_ERR(kvm_sregs); | |
18595411 | 1979 | kvm_sregs = NULL; |
6aa8b732 | 1980 | goto out; |
ff5c2c03 | 1981 | } |
fa3795a7 | 1982 | r = kvm_arch_vcpu_ioctl_set_sregs(vcpu, kvm_sregs); |
6aa8b732 AK |
1983 | break; |
1984 | } | |
62d9f0db MT |
1985 | case KVM_GET_MP_STATE: { |
1986 | struct kvm_mp_state mp_state; | |
1987 | ||
1988 | r = kvm_arch_vcpu_ioctl_get_mpstate(vcpu, &mp_state); | |
1989 | if (r) | |
1990 | goto out; | |
1991 | r = -EFAULT; | |
1992 | if (copy_to_user(argp, &mp_state, sizeof mp_state)) | |
1993 | goto out; | |
1994 | r = 0; | |
1995 | break; | |
1996 | } | |
1997 | case KVM_SET_MP_STATE: { | |
1998 | struct kvm_mp_state mp_state; | |
1999 | ||
2000 | r = -EFAULT; | |
2001 | if (copy_from_user(&mp_state, argp, sizeof mp_state)) | |
2002 | goto out; | |
2003 | r = kvm_arch_vcpu_ioctl_set_mpstate(vcpu, &mp_state); | |
62d9f0db MT |
2004 | break; |
2005 | } | |
6aa8b732 AK |
2006 | case KVM_TRANSLATE: { |
2007 | struct kvm_translation tr; | |
2008 | ||
2009 | r = -EFAULT; | |
2f366987 | 2010 | if (copy_from_user(&tr, argp, sizeof tr)) |
6aa8b732 | 2011 | goto out; |
8b006791 | 2012 | r = kvm_arch_vcpu_ioctl_translate(vcpu, &tr); |
6aa8b732 AK |
2013 | if (r) |
2014 | goto out; | |
2015 | r = -EFAULT; | |
2f366987 | 2016 | if (copy_to_user(argp, &tr, sizeof tr)) |
6aa8b732 AK |
2017 | goto out; |
2018 | r = 0; | |
2019 | break; | |
2020 | } | |
d0bfb940 JK |
2021 | case KVM_SET_GUEST_DEBUG: { |
2022 | struct kvm_guest_debug dbg; | |
6aa8b732 AK |
2023 | |
2024 | r = -EFAULT; | |
2f366987 | 2025 | if (copy_from_user(&dbg, argp, sizeof dbg)) |
6aa8b732 | 2026 | goto out; |
d0bfb940 | 2027 | r = kvm_arch_vcpu_ioctl_set_guest_debug(vcpu, &dbg); |
6aa8b732 AK |
2028 | break; |
2029 | } | |
1961d276 AK |
2030 | case KVM_SET_SIGNAL_MASK: { |
2031 | struct kvm_signal_mask __user *sigmask_arg = argp; | |
2032 | struct kvm_signal_mask kvm_sigmask; | |
2033 | sigset_t sigset, *p; | |
2034 | ||
2035 | p = NULL; | |
2036 | if (argp) { | |
2037 | r = -EFAULT; | |
2038 | if (copy_from_user(&kvm_sigmask, argp, | |
2039 | sizeof kvm_sigmask)) | |
2040 | goto out; | |
2041 | r = -EINVAL; | |
2042 | if (kvm_sigmask.len != sizeof sigset) | |
2043 | goto out; | |
2044 | r = -EFAULT; | |
2045 | if (copy_from_user(&sigset, sigmask_arg->sigset, | |
2046 | sizeof sigset)) | |
2047 | goto out; | |
2048 | p = &sigset; | |
2049 | } | |
376d41ff | 2050 | r = kvm_vcpu_ioctl_set_sigmask(vcpu, p); |
1961d276 AK |
2051 | break; |
2052 | } | |
b8836737 | 2053 | case KVM_GET_FPU: { |
fa3795a7 DH |
2054 | fpu = kzalloc(sizeof(struct kvm_fpu), GFP_KERNEL); |
2055 | r = -ENOMEM; | |
2056 | if (!fpu) | |
2057 | goto out; | |
2058 | r = kvm_arch_vcpu_ioctl_get_fpu(vcpu, fpu); | |
b8836737 AK |
2059 | if (r) |
2060 | goto out; | |
2061 | r = -EFAULT; | |
fa3795a7 | 2062 | if (copy_to_user(argp, fpu, sizeof(struct kvm_fpu))) |
b8836737 AK |
2063 | goto out; |
2064 | r = 0; | |
2065 | break; | |
2066 | } | |
2067 | case KVM_SET_FPU: { | |
ff5c2c03 SL |
2068 | fpu = memdup_user(argp, sizeof(*fpu)); |
2069 | if (IS_ERR(fpu)) { | |
2070 | r = PTR_ERR(fpu); | |
18595411 | 2071 | fpu = NULL; |
b8836737 | 2072 | goto out; |
ff5c2c03 | 2073 | } |
fa3795a7 | 2074 | r = kvm_arch_vcpu_ioctl_set_fpu(vcpu, fpu); |
b8836737 AK |
2075 | break; |
2076 | } | |
bccf2150 | 2077 | default: |
313a3dc7 | 2078 | r = kvm_arch_vcpu_ioctl(filp, ioctl, arg); |
bccf2150 AK |
2079 | } |
2080 | out: | |
2122ff5e | 2081 | vcpu_put(vcpu); |
fa3795a7 DH |
2082 | kfree(fpu); |
2083 | kfree(kvm_sregs); | |
bccf2150 AK |
2084 | return r; |
2085 | } | |
2086 | ||
1dda606c AG |
2087 | #ifdef CONFIG_COMPAT |
2088 | static long kvm_vcpu_compat_ioctl(struct file *filp, | |
2089 | unsigned int ioctl, unsigned long arg) | |
2090 | { | |
2091 | struct kvm_vcpu *vcpu = filp->private_data; | |
2092 | void __user *argp = compat_ptr(arg); | |
2093 | int r; | |
2094 | ||
2095 | if (vcpu->kvm->mm != current->mm) | |
2096 | return -EIO; | |
2097 | ||
2098 | switch (ioctl) { | |
2099 | case KVM_SET_SIGNAL_MASK: { | |
2100 | struct kvm_signal_mask __user *sigmask_arg = argp; | |
2101 | struct kvm_signal_mask kvm_sigmask; | |
2102 | compat_sigset_t csigset; | |
2103 | sigset_t sigset; | |
2104 | ||
2105 | if (argp) { | |
2106 | r = -EFAULT; | |
2107 | if (copy_from_user(&kvm_sigmask, argp, | |
2108 | sizeof kvm_sigmask)) | |
2109 | goto out; | |
2110 | r = -EINVAL; | |
2111 | if (kvm_sigmask.len != sizeof csigset) | |
2112 | goto out; | |
2113 | r = -EFAULT; | |
2114 | if (copy_from_user(&csigset, sigmask_arg->sigset, | |
2115 | sizeof csigset)) | |
2116 | goto out; | |
760a9a30 AC |
2117 | sigset_from_compat(&sigset, &csigset); |
2118 | r = kvm_vcpu_ioctl_set_sigmask(vcpu, &sigset); | |
2119 | } else | |
2120 | r = kvm_vcpu_ioctl_set_sigmask(vcpu, NULL); | |
1dda606c AG |
2121 | break; |
2122 | } | |
2123 | default: | |
2124 | r = kvm_vcpu_ioctl(filp, ioctl, arg); | |
2125 | } | |
2126 | ||
2127 | out: | |
2128 | return r; | |
2129 | } | |
2130 | #endif | |
2131 | ||
bccf2150 AK |
2132 | static long kvm_vm_ioctl(struct file *filp, |
2133 | unsigned int ioctl, unsigned long arg) | |
2134 | { | |
2135 | struct kvm *kvm = filp->private_data; | |
2136 | void __user *argp = (void __user *)arg; | |
1fe779f8 | 2137 | int r; |
bccf2150 | 2138 | |
6d4e4c4f AK |
2139 | if (kvm->mm != current->mm) |
2140 | return -EIO; | |
bccf2150 AK |
2141 | switch (ioctl) { |
2142 | case KVM_CREATE_VCPU: | |
2143 | r = kvm_vm_ioctl_create_vcpu(kvm, arg); | |
bccf2150 | 2144 | break; |
6fc138d2 IE |
2145 | case KVM_SET_USER_MEMORY_REGION: { |
2146 | struct kvm_userspace_memory_region kvm_userspace_mem; | |
2147 | ||
2148 | r = -EFAULT; | |
2149 | if (copy_from_user(&kvm_userspace_mem, argp, | |
2150 | sizeof kvm_userspace_mem)) | |
2151 | goto out; | |
2152 | ||
f82a8cfe | 2153 | r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_userspace_mem, true); |
6aa8b732 AK |
2154 | break; |
2155 | } | |
2156 | case KVM_GET_DIRTY_LOG: { | |
2157 | struct kvm_dirty_log log; | |
2158 | ||
2159 | r = -EFAULT; | |
2f366987 | 2160 | if (copy_from_user(&log, argp, sizeof log)) |
6aa8b732 | 2161 | goto out; |
2c6f5df9 | 2162 | r = kvm_vm_ioctl_get_dirty_log(kvm, &log); |
6aa8b732 AK |
2163 | break; |
2164 | } | |
5f94c174 LV |
2165 | #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET |
2166 | case KVM_REGISTER_COALESCED_MMIO: { | |
2167 | struct kvm_coalesced_mmio_zone zone; | |
2168 | r = -EFAULT; | |
2169 | if (copy_from_user(&zone, argp, sizeof zone)) | |
2170 | goto out; | |
5f94c174 | 2171 | r = kvm_vm_ioctl_register_coalesced_mmio(kvm, &zone); |
5f94c174 LV |
2172 | break; |
2173 | } | |
2174 | case KVM_UNREGISTER_COALESCED_MMIO: { | |
2175 | struct kvm_coalesced_mmio_zone zone; | |
2176 | r = -EFAULT; | |
2177 | if (copy_from_user(&zone, argp, sizeof zone)) | |
2178 | goto out; | |
5f94c174 | 2179 | r = kvm_vm_ioctl_unregister_coalesced_mmio(kvm, &zone); |
5f94c174 LV |
2180 | break; |
2181 | } | |
2182 | #endif | |
721eecbf GH |
2183 | case KVM_IRQFD: { |
2184 | struct kvm_irqfd data; | |
2185 | ||
2186 | r = -EFAULT; | |
2187 | if (copy_from_user(&data, argp, sizeof data)) | |
2188 | goto out; | |
d4db2935 | 2189 | r = kvm_irqfd(kvm, &data); |
721eecbf GH |
2190 | break; |
2191 | } | |
d34e6b17 GH |
2192 | case KVM_IOEVENTFD: { |
2193 | struct kvm_ioeventfd data; | |
2194 | ||
2195 | r = -EFAULT; | |
2196 | if (copy_from_user(&data, argp, sizeof data)) | |
2197 | goto out; | |
2198 | r = kvm_ioeventfd(kvm, &data); | |
2199 | break; | |
2200 | } | |
73880c80 GN |
2201 | #ifdef CONFIG_KVM_APIC_ARCHITECTURE |
2202 | case KVM_SET_BOOT_CPU_ID: | |
2203 | r = 0; | |
894a9c55 | 2204 | mutex_lock(&kvm->lock); |
73880c80 GN |
2205 | if (atomic_read(&kvm->online_vcpus) != 0) |
2206 | r = -EBUSY; | |
2207 | else | |
2208 | kvm->bsp_vcpu_id = arg; | |
894a9c55 | 2209 | mutex_unlock(&kvm->lock); |
73880c80 | 2210 | break; |
07975ad3 JK |
2211 | #endif |
2212 | #ifdef CONFIG_HAVE_KVM_MSI | |
2213 | case KVM_SIGNAL_MSI: { | |
2214 | struct kvm_msi msi; | |
2215 | ||
2216 | r = -EFAULT; | |
2217 | if (copy_from_user(&msi, argp, sizeof msi)) | |
2218 | goto out; | |
2219 | r = kvm_send_userspace_msi(kvm, &msi); | |
2220 | break; | |
2221 | } | |
23d43cf9 CD |
2222 | #endif |
2223 | #ifdef __KVM_HAVE_IRQ_LINE | |
2224 | case KVM_IRQ_LINE_STATUS: | |
2225 | case KVM_IRQ_LINE: { | |
2226 | struct kvm_irq_level irq_event; | |
2227 | ||
2228 | r = -EFAULT; | |
2229 | if (copy_from_user(&irq_event, argp, sizeof irq_event)) | |
2230 | goto out; | |
2231 | ||
2232 | r = kvm_vm_ioctl_irq_line(kvm, &irq_event); | |
2233 | if (r) | |
2234 | goto out; | |
2235 | ||
2236 | r = -EFAULT; | |
2237 | if (ioctl == KVM_IRQ_LINE_STATUS) { | |
2238 | if (copy_to_user(argp, &irq_event, sizeof irq_event)) | |
2239 | goto out; | |
2240 | } | |
2241 | ||
2242 | r = 0; | |
2243 | break; | |
2244 | } | |
73880c80 | 2245 | #endif |
f17abe9a | 2246 | default: |
1fe779f8 | 2247 | r = kvm_arch_vm_ioctl(filp, ioctl, arg); |
bfd99ff5 AK |
2248 | if (r == -ENOTTY) |
2249 | r = kvm_vm_ioctl_assigned_device(kvm, ioctl, arg); | |
f17abe9a AK |
2250 | } |
2251 | out: | |
2252 | return r; | |
2253 | } | |
2254 | ||
6ff5894c AB |
2255 | #ifdef CONFIG_COMPAT |
2256 | struct compat_kvm_dirty_log { | |
2257 | __u32 slot; | |
2258 | __u32 padding1; | |
2259 | union { | |
2260 | compat_uptr_t dirty_bitmap; /* one bit per page */ | |
2261 | __u64 padding2; | |
2262 | }; | |
2263 | }; | |
2264 | ||
2265 | static long kvm_vm_compat_ioctl(struct file *filp, | |
2266 | unsigned int ioctl, unsigned long arg) | |
2267 | { | |
2268 | struct kvm *kvm = filp->private_data; | |
2269 | int r; | |
2270 | ||
2271 | if (kvm->mm != current->mm) | |
2272 | return -EIO; | |
2273 | switch (ioctl) { | |
2274 | case KVM_GET_DIRTY_LOG: { | |
2275 | struct compat_kvm_dirty_log compat_log; | |
2276 | struct kvm_dirty_log log; | |
2277 | ||
2278 | r = -EFAULT; | |
2279 | if (copy_from_user(&compat_log, (void __user *)arg, | |
2280 | sizeof(compat_log))) | |
2281 | goto out; | |
2282 | log.slot = compat_log.slot; | |
2283 | log.padding1 = compat_log.padding1; | |
2284 | log.padding2 = compat_log.padding2; | |
2285 | log.dirty_bitmap = compat_ptr(compat_log.dirty_bitmap); | |
2286 | ||
2287 | r = kvm_vm_ioctl_get_dirty_log(kvm, &log); | |
6ff5894c AB |
2288 | break; |
2289 | } | |
2290 | default: | |
2291 | r = kvm_vm_ioctl(filp, ioctl, arg); | |
2292 | } | |
2293 | ||
2294 | out: | |
2295 | return r; | |
2296 | } | |
2297 | #endif | |
2298 | ||
e4a533a4 | 2299 | static int kvm_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf) |
f17abe9a | 2300 | { |
777b3f49 MT |
2301 | struct page *page[1]; |
2302 | unsigned long addr; | |
2303 | int npages; | |
2304 | gfn_t gfn = vmf->pgoff; | |
f17abe9a | 2305 | struct kvm *kvm = vma->vm_file->private_data; |
f17abe9a | 2306 | |
777b3f49 MT |
2307 | addr = gfn_to_hva(kvm, gfn); |
2308 | if (kvm_is_error_hva(addr)) | |
e4a533a4 | 2309 | return VM_FAULT_SIGBUS; |
777b3f49 MT |
2310 | |
2311 | npages = get_user_pages(current, current->mm, addr, 1, 1, 0, page, | |
2312 | NULL); | |
2313 | if (unlikely(npages != 1)) | |
e4a533a4 | 2314 | return VM_FAULT_SIGBUS; |
777b3f49 MT |
2315 | |
2316 | vmf->page = page[0]; | |
e4a533a4 | 2317 | return 0; |
f17abe9a AK |
2318 | } |
2319 | ||
f0f37e2f | 2320 | static const struct vm_operations_struct kvm_vm_vm_ops = { |
e4a533a4 | 2321 | .fault = kvm_vm_fault, |
f17abe9a AK |
2322 | }; |
2323 | ||
2324 | static int kvm_vm_mmap(struct file *file, struct vm_area_struct *vma) | |
2325 | { | |
2326 | vma->vm_ops = &kvm_vm_vm_ops; | |
2327 | return 0; | |
2328 | } | |
2329 | ||
3d3aab1b | 2330 | static struct file_operations kvm_vm_fops = { |
f17abe9a AK |
2331 | .release = kvm_vm_release, |
2332 | .unlocked_ioctl = kvm_vm_ioctl, | |
6ff5894c AB |
2333 | #ifdef CONFIG_COMPAT |
2334 | .compat_ioctl = kvm_vm_compat_ioctl, | |
2335 | #endif | |
f17abe9a | 2336 | .mmap = kvm_vm_mmap, |
6038f373 | 2337 | .llseek = noop_llseek, |
f17abe9a AK |
2338 | }; |
2339 | ||
e08b9637 | 2340 | static int kvm_dev_ioctl_create_vm(unsigned long type) |
f17abe9a | 2341 | { |
aac87636 | 2342 | int r; |
f17abe9a AK |
2343 | struct kvm *kvm; |
2344 | ||
e08b9637 | 2345 | kvm = kvm_create_vm(type); |
d6d28168 AK |
2346 | if (IS_ERR(kvm)) |
2347 | return PTR_ERR(kvm); | |
6ce5a090 TY |
2348 | #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET |
2349 | r = kvm_coalesced_mmio_init(kvm); | |
2350 | if (r < 0) { | |
2351 | kvm_put_kvm(kvm); | |
2352 | return r; | |
2353 | } | |
2354 | #endif | |
aac87636 HC |
2355 | r = anon_inode_getfd("kvm-vm", &kvm_vm_fops, kvm, O_RDWR); |
2356 | if (r < 0) | |
66c0b394 | 2357 | kvm_put_kvm(kvm); |
f17abe9a | 2358 | |
aac87636 | 2359 | return r; |
f17abe9a AK |
2360 | } |
2361 | ||
1a811b61 AK |
2362 | static long kvm_dev_ioctl_check_extension_generic(long arg) |
2363 | { | |
2364 | switch (arg) { | |
ca9edaee | 2365 | case KVM_CAP_USER_MEMORY: |
1a811b61 | 2366 | case KVM_CAP_DESTROY_MEMORY_REGION_WORKS: |
4cd481f6 | 2367 | case KVM_CAP_JOIN_MEMORY_REGIONS_WORKS: |
73880c80 GN |
2368 | #ifdef CONFIG_KVM_APIC_ARCHITECTURE |
2369 | case KVM_CAP_SET_BOOT_CPU_ID: | |
2370 | #endif | |
a9c7399d | 2371 | case KVM_CAP_INTERNAL_ERROR_DATA: |
07975ad3 JK |
2372 | #ifdef CONFIG_HAVE_KVM_MSI |
2373 | case KVM_CAP_SIGNAL_MSI: | |
2374 | #endif | |
1a811b61 | 2375 | return 1; |
9900b4b4 | 2376 | #ifdef KVM_CAP_IRQ_ROUTING |
399ec807 | 2377 | case KVM_CAP_IRQ_ROUTING: |
36463146 | 2378 | return KVM_MAX_IRQ_ROUTES; |
399ec807 | 2379 | #endif |
1a811b61 AK |
2380 | default: |
2381 | break; | |
2382 | } | |
2383 | return kvm_dev_ioctl_check_extension(arg); | |
2384 | } | |
2385 | ||
f17abe9a AK |
2386 | static long kvm_dev_ioctl(struct file *filp, |
2387 | unsigned int ioctl, unsigned long arg) | |
2388 | { | |
07c45a36 | 2389 | long r = -EINVAL; |
f17abe9a AK |
2390 | |
2391 | switch (ioctl) { | |
2392 | case KVM_GET_API_VERSION: | |
f0fe5108 AK |
2393 | r = -EINVAL; |
2394 | if (arg) | |
2395 | goto out; | |
f17abe9a AK |
2396 | r = KVM_API_VERSION; |
2397 | break; | |
2398 | case KVM_CREATE_VM: | |
e08b9637 | 2399 | r = kvm_dev_ioctl_create_vm(arg); |
f17abe9a | 2400 | break; |
018d00d2 | 2401 | case KVM_CHECK_EXTENSION: |
1a811b61 | 2402 | r = kvm_dev_ioctl_check_extension_generic(arg); |
5d308f45 | 2403 | break; |
07c45a36 AK |
2404 | case KVM_GET_VCPU_MMAP_SIZE: |
2405 | r = -EINVAL; | |
2406 | if (arg) | |
2407 | goto out; | |
adb1ff46 AK |
2408 | r = PAGE_SIZE; /* struct kvm_run */ |
2409 | #ifdef CONFIG_X86 | |
2410 | r += PAGE_SIZE; /* pio data page */ | |
5f94c174 LV |
2411 | #endif |
2412 | #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET | |
2413 | r += PAGE_SIZE; /* coalesced mmio ring page */ | |
adb1ff46 | 2414 | #endif |
07c45a36 | 2415 | break; |
d4c9ff2d FEL |
2416 | case KVM_TRACE_ENABLE: |
2417 | case KVM_TRACE_PAUSE: | |
2418 | case KVM_TRACE_DISABLE: | |
2023a29c | 2419 | r = -EOPNOTSUPP; |
d4c9ff2d | 2420 | break; |
6aa8b732 | 2421 | default: |
043405e1 | 2422 | return kvm_arch_dev_ioctl(filp, ioctl, arg); |
6aa8b732 AK |
2423 | } |
2424 | out: | |
2425 | return r; | |
2426 | } | |
2427 | ||
6aa8b732 | 2428 | static struct file_operations kvm_chardev_ops = { |
6aa8b732 AK |
2429 | .unlocked_ioctl = kvm_dev_ioctl, |
2430 | .compat_ioctl = kvm_dev_ioctl, | |
6038f373 | 2431 | .llseek = noop_llseek, |
6aa8b732 AK |
2432 | }; |
2433 | ||
2434 | static struct miscdevice kvm_dev = { | |
bbe4432e | 2435 | KVM_MINOR, |
6aa8b732 AK |
2436 | "kvm", |
2437 | &kvm_chardev_ops, | |
2438 | }; | |
2439 | ||
75b7127c | 2440 | static void hardware_enable_nolock(void *junk) |
1b6c0168 AK |
2441 | { |
2442 | int cpu = raw_smp_processor_id(); | |
10474ae8 | 2443 | int r; |
1b6c0168 | 2444 | |
7f59f492 | 2445 | if (cpumask_test_cpu(cpu, cpus_hardware_enabled)) |
1b6c0168 | 2446 | return; |
10474ae8 | 2447 | |
7f59f492 | 2448 | cpumask_set_cpu(cpu, cpus_hardware_enabled); |
10474ae8 AG |
2449 | |
2450 | r = kvm_arch_hardware_enable(NULL); | |
2451 | ||
2452 | if (r) { | |
2453 | cpumask_clear_cpu(cpu, cpus_hardware_enabled); | |
2454 | atomic_inc(&hardware_enable_failed); | |
2455 | printk(KERN_INFO "kvm: enabling virtualization on " | |
2456 | "CPU%d failed\n", cpu); | |
2457 | } | |
1b6c0168 AK |
2458 | } |
2459 | ||
75b7127c TY |
2460 | static void hardware_enable(void *junk) |
2461 | { | |
e935b837 | 2462 | raw_spin_lock(&kvm_lock); |
75b7127c | 2463 | hardware_enable_nolock(junk); |
e935b837 | 2464 | raw_spin_unlock(&kvm_lock); |
75b7127c TY |
2465 | } |
2466 | ||
2467 | static void hardware_disable_nolock(void *junk) | |
1b6c0168 AK |
2468 | { |
2469 | int cpu = raw_smp_processor_id(); | |
2470 | ||
7f59f492 | 2471 | if (!cpumask_test_cpu(cpu, cpus_hardware_enabled)) |
1b6c0168 | 2472 | return; |
7f59f492 | 2473 | cpumask_clear_cpu(cpu, cpus_hardware_enabled); |
e9b11c17 | 2474 | kvm_arch_hardware_disable(NULL); |
1b6c0168 AK |
2475 | } |
2476 | ||
75b7127c TY |
2477 | static void hardware_disable(void *junk) |
2478 | { | |
e935b837 | 2479 | raw_spin_lock(&kvm_lock); |
75b7127c | 2480 | hardware_disable_nolock(junk); |
e935b837 | 2481 | raw_spin_unlock(&kvm_lock); |
75b7127c TY |
2482 | } |
2483 | ||
10474ae8 AG |
2484 | static void hardware_disable_all_nolock(void) |
2485 | { | |
2486 | BUG_ON(!kvm_usage_count); | |
2487 | ||
2488 | kvm_usage_count--; | |
2489 | if (!kvm_usage_count) | |
75b7127c | 2490 | on_each_cpu(hardware_disable_nolock, NULL, 1); |
10474ae8 AG |
2491 | } |
2492 | ||
2493 | static void hardware_disable_all(void) | |
2494 | { | |
e935b837 | 2495 | raw_spin_lock(&kvm_lock); |
10474ae8 | 2496 | hardware_disable_all_nolock(); |
e935b837 | 2497 | raw_spin_unlock(&kvm_lock); |
10474ae8 AG |
2498 | } |
2499 | ||
2500 | static int hardware_enable_all(void) | |
2501 | { | |
2502 | int r = 0; | |
2503 | ||
e935b837 | 2504 | raw_spin_lock(&kvm_lock); |
10474ae8 AG |
2505 | |
2506 | kvm_usage_count++; | |
2507 | if (kvm_usage_count == 1) { | |
2508 | atomic_set(&hardware_enable_failed, 0); | |
75b7127c | 2509 | on_each_cpu(hardware_enable_nolock, NULL, 1); |
10474ae8 AG |
2510 | |
2511 | if (atomic_read(&hardware_enable_failed)) { | |
2512 | hardware_disable_all_nolock(); | |
2513 | r = -EBUSY; | |
2514 | } | |
2515 | } | |
2516 | ||
e935b837 | 2517 | raw_spin_unlock(&kvm_lock); |
10474ae8 AG |
2518 | |
2519 | return r; | |
2520 | } | |
2521 | ||
774c47f1 AK |
2522 | static int kvm_cpu_hotplug(struct notifier_block *notifier, unsigned long val, |
2523 | void *v) | |
2524 | { | |
2525 | int cpu = (long)v; | |
2526 | ||
10474ae8 AG |
2527 | if (!kvm_usage_count) |
2528 | return NOTIFY_OK; | |
2529 | ||
1a6f4d7f | 2530 | val &= ~CPU_TASKS_FROZEN; |
774c47f1 | 2531 | switch (val) { |
cec9ad27 | 2532 | case CPU_DYING: |
6ec8a856 AK |
2533 | printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n", |
2534 | cpu); | |
2535 | hardware_disable(NULL); | |
2536 | break; | |
da908f2f | 2537 | case CPU_STARTING: |
43934a38 JK |
2538 | printk(KERN_INFO "kvm: enabling virtualization on CPU%d\n", |
2539 | cpu); | |
da908f2f | 2540 | hardware_enable(NULL); |
774c47f1 AK |
2541 | break; |
2542 | } | |
2543 | return NOTIFY_OK; | |
2544 | } | |
2545 | ||
4ecac3fd | 2546 | |
b7c4145b | 2547 | asmlinkage void kvm_spurious_fault(void) |
4ecac3fd | 2548 | { |
4ecac3fd AK |
2549 | /* Fault while not rebooting. We want the trace. */ |
2550 | BUG(); | |
2551 | } | |
b7c4145b | 2552 | EXPORT_SYMBOL_GPL(kvm_spurious_fault); |
4ecac3fd | 2553 | |
9a2b85c6 | 2554 | static int kvm_reboot(struct notifier_block *notifier, unsigned long val, |
d77c26fc | 2555 | void *v) |
9a2b85c6 | 2556 | { |
8e1c1815 SY |
2557 | /* |
2558 | * Some (well, at least mine) BIOSes hang on reboot if | |
2559 | * in vmx root mode. | |
2560 | * | |
2561 | * And Intel TXT required VMX off for all cpu when system shutdown. | |
2562 | */ | |
2563 | printk(KERN_INFO "kvm: exiting hardware virtualization\n"); | |
2564 | kvm_rebooting = true; | |
75b7127c | 2565 | on_each_cpu(hardware_disable_nolock, NULL, 1); |
9a2b85c6 RR |
2566 | return NOTIFY_OK; |
2567 | } | |
2568 | ||
2569 | static struct notifier_block kvm_reboot_notifier = { | |
2570 | .notifier_call = kvm_reboot, | |
2571 | .priority = 0, | |
2572 | }; | |
2573 | ||
e93f8a0f | 2574 | static void kvm_io_bus_destroy(struct kvm_io_bus *bus) |
2eeb2e94 GH |
2575 | { |
2576 | int i; | |
2577 | ||
2578 | for (i = 0; i < bus->dev_count; i++) { | |
743eeb0b | 2579 | struct kvm_io_device *pos = bus->range[i].dev; |
2eeb2e94 GH |
2580 | |
2581 | kvm_iodevice_destructor(pos); | |
2582 | } | |
e93f8a0f | 2583 | kfree(bus); |
2eeb2e94 GH |
2584 | } |
2585 | ||
743eeb0b SL |
2586 | int kvm_io_bus_sort_cmp(const void *p1, const void *p2) |
2587 | { | |
2588 | const struct kvm_io_range *r1 = p1; | |
2589 | const struct kvm_io_range *r2 = p2; | |
2590 | ||
2591 | if (r1->addr < r2->addr) | |
2592 | return -1; | |
2593 | if (r1->addr + r1->len > r2->addr + r2->len) | |
2594 | return 1; | |
2595 | return 0; | |
2596 | } | |
2597 | ||
2598 | int kvm_io_bus_insert_dev(struct kvm_io_bus *bus, struct kvm_io_device *dev, | |
2599 | gpa_t addr, int len) | |
2600 | { | |
743eeb0b SL |
2601 | bus->range[bus->dev_count++] = (struct kvm_io_range) { |
2602 | .addr = addr, | |
2603 | .len = len, | |
2604 | .dev = dev, | |
2605 | }; | |
2606 | ||
2607 | sort(bus->range, bus->dev_count, sizeof(struct kvm_io_range), | |
2608 | kvm_io_bus_sort_cmp, NULL); | |
2609 | ||
2610 | return 0; | |
2611 | } | |
2612 | ||
2613 | int kvm_io_bus_get_first_dev(struct kvm_io_bus *bus, | |
2614 | gpa_t addr, int len) | |
2615 | { | |
2616 | struct kvm_io_range *range, key; | |
2617 | int off; | |
2618 | ||
2619 | key = (struct kvm_io_range) { | |
2620 | .addr = addr, | |
2621 | .len = len, | |
2622 | }; | |
2623 | ||
2624 | range = bsearch(&key, bus->range, bus->dev_count, | |
2625 | sizeof(struct kvm_io_range), kvm_io_bus_sort_cmp); | |
2626 | if (range == NULL) | |
2627 | return -ENOENT; | |
2628 | ||
2629 | off = range - bus->range; | |
2630 | ||
2631 | while (off > 0 && kvm_io_bus_sort_cmp(&key, &bus->range[off-1]) == 0) | |
2632 | off--; | |
2633 | ||
2634 | return off; | |
2635 | } | |
2636 | ||
bda9020e | 2637 | /* kvm_io_bus_write - called under kvm->slots_lock */ |
e93f8a0f | 2638 | int kvm_io_bus_write(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr, |
bda9020e | 2639 | int len, const void *val) |
2eeb2e94 | 2640 | { |
743eeb0b | 2641 | int idx; |
90d83dc3 | 2642 | struct kvm_io_bus *bus; |
743eeb0b SL |
2643 | struct kvm_io_range range; |
2644 | ||
2645 | range = (struct kvm_io_range) { | |
2646 | .addr = addr, | |
2647 | .len = len, | |
2648 | }; | |
90d83dc3 LJ |
2649 | |
2650 | bus = srcu_dereference(kvm->buses[bus_idx], &kvm->srcu); | |
743eeb0b SL |
2651 | idx = kvm_io_bus_get_first_dev(bus, addr, len); |
2652 | if (idx < 0) | |
2653 | return -EOPNOTSUPP; | |
2654 | ||
2655 | while (idx < bus->dev_count && | |
2656 | kvm_io_bus_sort_cmp(&range, &bus->range[idx]) == 0) { | |
2657 | if (!kvm_iodevice_write(bus->range[idx].dev, addr, len, val)) | |
bda9020e | 2658 | return 0; |
743eeb0b SL |
2659 | idx++; |
2660 | } | |
2661 | ||
bda9020e MT |
2662 | return -EOPNOTSUPP; |
2663 | } | |
2eeb2e94 | 2664 | |
bda9020e | 2665 | /* kvm_io_bus_read - called under kvm->slots_lock */ |
e93f8a0f MT |
2666 | int kvm_io_bus_read(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr, |
2667 | int len, void *val) | |
bda9020e | 2668 | { |
743eeb0b | 2669 | int idx; |
90d83dc3 | 2670 | struct kvm_io_bus *bus; |
743eeb0b SL |
2671 | struct kvm_io_range range; |
2672 | ||
2673 | range = (struct kvm_io_range) { | |
2674 | .addr = addr, | |
2675 | .len = len, | |
2676 | }; | |
e93f8a0f | 2677 | |
90d83dc3 | 2678 | bus = srcu_dereference(kvm->buses[bus_idx], &kvm->srcu); |
743eeb0b SL |
2679 | idx = kvm_io_bus_get_first_dev(bus, addr, len); |
2680 | if (idx < 0) | |
2681 | return -EOPNOTSUPP; | |
2682 | ||
2683 | while (idx < bus->dev_count && | |
2684 | kvm_io_bus_sort_cmp(&range, &bus->range[idx]) == 0) { | |
2685 | if (!kvm_iodevice_read(bus->range[idx].dev, addr, len, val)) | |
bda9020e | 2686 | return 0; |
743eeb0b SL |
2687 | idx++; |
2688 | } | |
2689 | ||
bda9020e | 2690 | return -EOPNOTSUPP; |
2eeb2e94 GH |
2691 | } |
2692 | ||
79fac95e | 2693 | /* Caller must hold slots_lock. */ |
743eeb0b SL |
2694 | int kvm_io_bus_register_dev(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr, |
2695 | int len, struct kvm_io_device *dev) | |
6c474694 | 2696 | { |
e93f8a0f | 2697 | struct kvm_io_bus *new_bus, *bus; |
090b7aff | 2698 | |
e93f8a0f | 2699 | bus = kvm->buses[bus_idx]; |
a1300716 | 2700 | if (bus->dev_count > NR_IOBUS_DEVS - 1) |
090b7aff | 2701 | return -ENOSPC; |
2eeb2e94 | 2702 | |
a1300716 AK |
2703 | new_bus = kzalloc(sizeof(*bus) + ((bus->dev_count + 1) * |
2704 | sizeof(struct kvm_io_range)), GFP_KERNEL); | |
e93f8a0f MT |
2705 | if (!new_bus) |
2706 | return -ENOMEM; | |
a1300716 AK |
2707 | memcpy(new_bus, bus, sizeof(*bus) + (bus->dev_count * |
2708 | sizeof(struct kvm_io_range))); | |
743eeb0b | 2709 | kvm_io_bus_insert_dev(new_bus, dev, addr, len); |
e93f8a0f MT |
2710 | rcu_assign_pointer(kvm->buses[bus_idx], new_bus); |
2711 | synchronize_srcu_expedited(&kvm->srcu); | |
2712 | kfree(bus); | |
090b7aff GH |
2713 | |
2714 | return 0; | |
2715 | } | |
2716 | ||
79fac95e | 2717 | /* Caller must hold slots_lock. */ |
e93f8a0f MT |
2718 | int kvm_io_bus_unregister_dev(struct kvm *kvm, enum kvm_bus bus_idx, |
2719 | struct kvm_io_device *dev) | |
090b7aff | 2720 | { |
e93f8a0f MT |
2721 | int i, r; |
2722 | struct kvm_io_bus *new_bus, *bus; | |
090b7aff | 2723 | |
cdfca7b3 | 2724 | bus = kvm->buses[bus_idx]; |
e93f8a0f | 2725 | r = -ENOENT; |
a1300716 AK |
2726 | for (i = 0; i < bus->dev_count; i++) |
2727 | if (bus->range[i].dev == dev) { | |
e93f8a0f | 2728 | r = 0; |
090b7aff GH |
2729 | break; |
2730 | } | |
e93f8a0f | 2731 | |
a1300716 | 2732 | if (r) |
e93f8a0f | 2733 | return r; |
a1300716 AK |
2734 | |
2735 | new_bus = kzalloc(sizeof(*bus) + ((bus->dev_count - 1) * | |
2736 | sizeof(struct kvm_io_range)), GFP_KERNEL); | |
2737 | if (!new_bus) | |
2738 | return -ENOMEM; | |
2739 | ||
2740 | memcpy(new_bus, bus, sizeof(*bus) + i * sizeof(struct kvm_io_range)); | |
2741 | new_bus->dev_count--; | |
2742 | memcpy(new_bus->range + i, bus->range + i + 1, | |
2743 | (new_bus->dev_count - i) * sizeof(struct kvm_io_range)); | |
e93f8a0f MT |
2744 | |
2745 | rcu_assign_pointer(kvm->buses[bus_idx], new_bus); | |
2746 | synchronize_srcu_expedited(&kvm->srcu); | |
2747 | kfree(bus); | |
2748 | return r; | |
2eeb2e94 GH |
2749 | } |
2750 | ||
774c47f1 AK |
2751 | static struct notifier_block kvm_cpu_notifier = { |
2752 | .notifier_call = kvm_cpu_hotplug, | |
774c47f1 AK |
2753 | }; |
2754 | ||
8b88b099 | 2755 | static int vm_stat_get(void *_offset, u64 *val) |
ba1389b7 AK |
2756 | { |
2757 | unsigned offset = (long)_offset; | |
ba1389b7 AK |
2758 | struct kvm *kvm; |
2759 | ||
8b88b099 | 2760 | *val = 0; |
e935b837 | 2761 | raw_spin_lock(&kvm_lock); |
ba1389b7 | 2762 | list_for_each_entry(kvm, &vm_list, vm_list) |
8b88b099 | 2763 | *val += *(u32 *)((void *)kvm + offset); |
e935b837 | 2764 | raw_spin_unlock(&kvm_lock); |
8b88b099 | 2765 | return 0; |
ba1389b7 AK |
2766 | } |
2767 | ||
2768 | DEFINE_SIMPLE_ATTRIBUTE(vm_stat_fops, vm_stat_get, NULL, "%llu\n"); | |
2769 | ||
8b88b099 | 2770 | static int vcpu_stat_get(void *_offset, u64 *val) |
1165f5fe AK |
2771 | { |
2772 | unsigned offset = (long)_offset; | |
1165f5fe AK |
2773 | struct kvm *kvm; |
2774 | struct kvm_vcpu *vcpu; | |
2775 | int i; | |
2776 | ||
8b88b099 | 2777 | *val = 0; |
e935b837 | 2778 | raw_spin_lock(&kvm_lock); |
1165f5fe | 2779 | list_for_each_entry(kvm, &vm_list, vm_list) |
988a2cae GN |
2780 | kvm_for_each_vcpu(i, vcpu, kvm) |
2781 | *val += *(u32 *)((void *)vcpu + offset); | |
2782 | ||
e935b837 | 2783 | raw_spin_unlock(&kvm_lock); |
8b88b099 | 2784 | return 0; |
1165f5fe AK |
2785 | } |
2786 | ||
ba1389b7 AK |
2787 | DEFINE_SIMPLE_ATTRIBUTE(vcpu_stat_fops, vcpu_stat_get, NULL, "%llu\n"); |
2788 | ||
828c0950 | 2789 | static const struct file_operations *stat_fops[] = { |
ba1389b7 AK |
2790 | [KVM_STAT_VCPU] = &vcpu_stat_fops, |
2791 | [KVM_STAT_VM] = &vm_stat_fops, | |
2792 | }; | |
1165f5fe | 2793 | |
4f69b680 | 2794 | static int kvm_init_debug(void) |
6aa8b732 | 2795 | { |
4f69b680 | 2796 | int r = -EFAULT; |
6aa8b732 AK |
2797 | struct kvm_stats_debugfs_item *p; |
2798 | ||
76f7c879 | 2799 | kvm_debugfs_dir = debugfs_create_dir("kvm", NULL); |
4f69b680 H |
2800 | if (kvm_debugfs_dir == NULL) |
2801 | goto out; | |
2802 | ||
2803 | for (p = debugfs_entries; p->name; ++p) { | |
76f7c879 | 2804 | p->dentry = debugfs_create_file(p->name, 0444, kvm_debugfs_dir, |
1165f5fe | 2805 | (void *)(long)p->offset, |
ba1389b7 | 2806 | stat_fops[p->kind]); |
4f69b680 H |
2807 | if (p->dentry == NULL) |
2808 | goto out_dir; | |
2809 | } | |
2810 | ||
2811 | return 0; | |
2812 | ||
2813 | out_dir: | |
2814 | debugfs_remove_recursive(kvm_debugfs_dir); | |
2815 | out: | |
2816 | return r; | |
6aa8b732 AK |
2817 | } |
2818 | ||
2819 | static void kvm_exit_debug(void) | |
2820 | { | |
2821 | struct kvm_stats_debugfs_item *p; | |
2822 | ||
2823 | for (p = debugfs_entries; p->name; ++p) | |
2824 | debugfs_remove(p->dentry); | |
76f7c879 | 2825 | debugfs_remove(kvm_debugfs_dir); |
6aa8b732 AK |
2826 | } |
2827 | ||
fb3600cc | 2828 | static int kvm_suspend(void) |
59ae6c6b | 2829 | { |
10474ae8 | 2830 | if (kvm_usage_count) |
75b7127c | 2831 | hardware_disable_nolock(NULL); |
59ae6c6b AK |
2832 | return 0; |
2833 | } | |
2834 | ||
fb3600cc | 2835 | static void kvm_resume(void) |
59ae6c6b | 2836 | { |
ca84d1a2 | 2837 | if (kvm_usage_count) { |
e935b837 | 2838 | WARN_ON(raw_spin_is_locked(&kvm_lock)); |
75b7127c | 2839 | hardware_enable_nolock(NULL); |
ca84d1a2 | 2840 | } |
59ae6c6b AK |
2841 | } |
2842 | ||
fb3600cc | 2843 | static struct syscore_ops kvm_syscore_ops = { |
59ae6c6b AK |
2844 | .suspend = kvm_suspend, |
2845 | .resume = kvm_resume, | |
2846 | }; | |
2847 | ||
15ad7146 AK |
2848 | static inline |
2849 | struct kvm_vcpu *preempt_notifier_to_vcpu(struct preempt_notifier *pn) | |
2850 | { | |
2851 | return container_of(pn, struct kvm_vcpu, preempt_notifier); | |
2852 | } | |
2853 | ||
2854 | static void kvm_sched_in(struct preempt_notifier *pn, int cpu) | |
2855 | { | |
2856 | struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn); | |
2857 | ||
e9b11c17 | 2858 | kvm_arch_vcpu_load(vcpu, cpu); |
15ad7146 AK |
2859 | } |
2860 | ||
2861 | static void kvm_sched_out(struct preempt_notifier *pn, | |
2862 | struct task_struct *next) | |
2863 | { | |
2864 | struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn); | |
2865 | ||
e9b11c17 | 2866 | kvm_arch_vcpu_put(vcpu); |
15ad7146 AK |
2867 | } |
2868 | ||
0ee75bea | 2869 | int kvm_init(void *opaque, unsigned vcpu_size, unsigned vcpu_align, |
c16f862d | 2870 | struct module *module) |
6aa8b732 AK |
2871 | { |
2872 | int r; | |
002c7f7c | 2873 | int cpu; |
6aa8b732 | 2874 | |
f8c16bba ZX |
2875 | r = kvm_arch_init(opaque); |
2876 | if (r) | |
d2308784 | 2877 | goto out_fail; |
cb498ea2 | 2878 | |
8437a617 | 2879 | if (!zalloc_cpumask_var(&cpus_hardware_enabled, GFP_KERNEL)) { |
7f59f492 RR |
2880 | r = -ENOMEM; |
2881 | goto out_free_0; | |
2882 | } | |
2883 | ||
e9b11c17 | 2884 | r = kvm_arch_hardware_setup(); |
6aa8b732 | 2885 | if (r < 0) |
7f59f492 | 2886 | goto out_free_0a; |
6aa8b732 | 2887 | |
002c7f7c YS |
2888 | for_each_online_cpu(cpu) { |
2889 | smp_call_function_single(cpu, | |
e9b11c17 | 2890 | kvm_arch_check_processor_compat, |
8691e5a8 | 2891 | &r, 1); |
002c7f7c | 2892 | if (r < 0) |
d2308784 | 2893 | goto out_free_1; |
002c7f7c YS |
2894 | } |
2895 | ||
774c47f1 AK |
2896 | r = register_cpu_notifier(&kvm_cpu_notifier); |
2897 | if (r) | |
d2308784 | 2898 | goto out_free_2; |
6aa8b732 AK |
2899 | register_reboot_notifier(&kvm_reboot_notifier); |
2900 | ||
c16f862d | 2901 | /* A kmem cache lets us meet the alignment requirements of fx_save. */ |
0ee75bea AK |
2902 | if (!vcpu_align) |
2903 | vcpu_align = __alignof__(struct kvm_vcpu); | |
2904 | kvm_vcpu_cache = kmem_cache_create("kvm_vcpu", vcpu_size, vcpu_align, | |
56919c5c | 2905 | 0, NULL); |
c16f862d RR |
2906 | if (!kvm_vcpu_cache) { |
2907 | r = -ENOMEM; | |
fb3600cc | 2908 | goto out_free_3; |
c16f862d RR |
2909 | } |
2910 | ||
af585b92 GN |
2911 | r = kvm_async_pf_init(); |
2912 | if (r) | |
2913 | goto out_free; | |
2914 | ||
6aa8b732 | 2915 | kvm_chardev_ops.owner = module; |
3d3aab1b CB |
2916 | kvm_vm_fops.owner = module; |
2917 | kvm_vcpu_fops.owner = module; | |
6aa8b732 AK |
2918 | |
2919 | r = misc_register(&kvm_dev); | |
2920 | if (r) { | |
d77c26fc | 2921 | printk(KERN_ERR "kvm: misc device register failed\n"); |
af585b92 | 2922 | goto out_unreg; |
6aa8b732 AK |
2923 | } |
2924 | ||
fb3600cc RW |
2925 | register_syscore_ops(&kvm_syscore_ops); |
2926 | ||
15ad7146 AK |
2927 | kvm_preempt_ops.sched_in = kvm_sched_in; |
2928 | kvm_preempt_ops.sched_out = kvm_sched_out; | |
2929 | ||
4f69b680 H |
2930 | r = kvm_init_debug(); |
2931 | if (r) { | |
2932 | printk(KERN_ERR "kvm: create debugfs files failed\n"); | |
2933 | goto out_undebugfs; | |
2934 | } | |
0ea4ed8e | 2935 | |
c7addb90 | 2936 | return 0; |
6aa8b732 | 2937 | |
4f69b680 H |
2938 | out_undebugfs: |
2939 | unregister_syscore_ops(&kvm_syscore_ops); | |
af585b92 GN |
2940 | out_unreg: |
2941 | kvm_async_pf_deinit(); | |
6aa8b732 | 2942 | out_free: |
c16f862d | 2943 | kmem_cache_destroy(kvm_vcpu_cache); |
d2308784 | 2944 | out_free_3: |
6aa8b732 | 2945 | unregister_reboot_notifier(&kvm_reboot_notifier); |
774c47f1 | 2946 | unregister_cpu_notifier(&kvm_cpu_notifier); |
d2308784 | 2947 | out_free_2: |
d2308784 | 2948 | out_free_1: |
e9b11c17 | 2949 | kvm_arch_hardware_unsetup(); |
7f59f492 RR |
2950 | out_free_0a: |
2951 | free_cpumask_var(cpus_hardware_enabled); | |
d2308784 | 2952 | out_free_0: |
f8c16bba | 2953 | kvm_arch_exit(); |
d2308784 | 2954 | out_fail: |
6aa8b732 AK |
2955 | return r; |
2956 | } | |
cb498ea2 | 2957 | EXPORT_SYMBOL_GPL(kvm_init); |
6aa8b732 | 2958 | |
cb498ea2 | 2959 | void kvm_exit(void) |
6aa8b732 | 2960 | { |
0ea4ed8e | 2961 | kvm_exit_debug(); |
6aa8b732 | 2962 | misc_deregister(&kvm_dev); |
c16f862d | 2963 | kmem_cache_destroy(kvm_vcpu_cache); |
af585b92 | 2964 | kvm_async_pf_deinit(); |
fb3600cc | 2965 | unregister_syscore_ops(&kvm_syscore_ops); |
6aa8b732 | 2966 | unregister_reboot_notifier(&kvm_reboot_notifier); |
59ae6c6b | 2967 | unregister_cpu_notifier(&kvm_cpu_notifier); |
75b7127c | 2968 | on_each_cpu(hardware_disable_nolock, NULL, 1); |
e9b11c17 | 2969 | kvm_arch_hardware_unsetup(); |
f8c16bba | 2970 | kvm_arch_exit(); |
7f59f492 | 2971 | free_cpumask_var(cpus_hardware_enabled); |
6aa8b732 | 2972 | } |
cb498ea2 | 2973 | EXPORT_SYMBOL_GPL(kvm_exit); |