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> | |
59ae6c6b | 33 | #include <linux/sysdev.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> |
6aa8b732 | 50 | |
e495606d | 51 | #include <asm/processor.h> |
e495606d AK |
52 | #include <asm/io.h> |
53 | #include <asm/uaccess.h> | |
3e021bf5 | 54 | #include <asm/pgtable.h> |
c8240bd6 | 55 | #include <asm-generic/bitops/le.h> |
6aa8b732 | 56 | |
5f94c174 | 57 | #include "coalesced_mmio.h" |
af585b92 | 58 | #include "async_pf.h" |
5f94c174 | 59 | |
229456fc MT |
60 | #define CREATE_TRACE_POINTS |
61 | #include <trace/events/kvm.h> | |
62 | ||
6aa8b732 AK |
63 | MODULE_AUTHOR("Qumranet"); |
64 | MODULE_LICENSE("GPL"); | |
65 | ||
fa40a821 MT |
66 | /* |
67 | * Ordering of locks: | |
68 | * | |
fae3a353 | 69 | * kvm->lock --> kvm->slots_lock --> kvm->irq_lock |
fa40a821 MT |
70 | */ |
71 | ||
e9b11c17 ZX |
72 | DEFINE_SPINLOCK(kvm_lock); |
73 | LIST_HEAD(vm_list); | |
133de902 | 74 | |
7f59f492 | 75 | static cpumask_var_t cpus_hardware_enabled; |
10474ae8 AG |
76 | static int kvm_usage_count = 0; |
77 | static atomic_t hardware_enable_failed; | |
1b6c0168 | 78 | |
c16f862d RR |
79 | struct kmem_cache *kvm_vcpu_cache; |
80 | EXPORT_SYMBOL_GPL(kvm_vcpu_cache); | |
1165f5fe | 81 | |
15ad7146 AK |
82 | static __read_mostly struct preempt_ops kvm_preempt_ops; |
83 | ||
76f7c879 | 84 | struct dentry *kvm_debugfs_dir; |
6aa8b732 | 85 | |
bccf2150 AK |
86 | static long kvm_vcpu_ioctl(struct file *file, unsigned int ioctl, |
87 | unsigned long arg); | |
10474ae8 AG |
88 | static int hardware_enable_all(void); |
89 | static void hardware_disable_all(void); | |
bccf2150 | 90 | |
e93f8a0f MT |
91 | static void kvm_io_bus_destroy(struct kvm_io_bus *bus); |
92 | ||
b7c4145b AK |
93 | bool kvm_rebooting; |
94 | EXPORT_SYMBOL_GPL(kvm_rebooting); | |
4ecac3fd | 95 | |
54dee993 MT |
96 | static bool largepages_enabled = true; |
97 | ||
fa7bff8f GN |
98 | static struct page *hwpoison_page; |
99 | static pfn_t hwpoison_pfn; | |
bf998156 | 100 | |
edba23e5 GN |
101 | static struct page *fault_page; |
102 | static pfn_t fault_pfn; | |
103 | ||
c77fb9dc | 104 | inline int kvm_is_mmio_pfn(pfn_t pfn) |
cbff90a7 | 105 | { |
fc5659c8 | 106 | if (pfn_valid(pfn)) { |
22e5c47e | 107 | int reserved; |
936a5fe6 | 108 | struct page *tail = pfn_to_page(pfn); |
22e5c47e AA |
109 | struct page *head = compound_trans_head(tail); |
110 | reserved = PageReserved(head); | |
936a5fe6 | 111 | if (head != tail) { |
936a5fe6 | 112 | /* |
22e5c47e AA |
113 | * "head" is not a dangling pointer |
114 | * (compound_trans_head takes care of that) | |
115 | * but the hugepage may have been splitted | |
116 | * from under us (and we may not hold a | |
117 | * reference count on the head page so it can | |
118 | * be reused before we run PageReferenced), so | |
119 | * we've to check PageTail before returning | |
120 | * what we just read. | |
936a5fe6 | 121 | */ |
22e5c47e AA |
122 | smp_rmb(); |
123 | if (PageTail(tail)) | |
124 | return reserved; | |
936a5fe6 AA |
125 | } |
126 | return PageReserved(tail); | |
fc5659c8 | 127 | } |
cbff90a7 BAY |
128 | |
129 | return true; | |
130 | } | |
131 | ||
bccf2150 AK |
132 | /* |
133 | * Switches to specified vcpu, until a matching vcpu_put() | |
134 | */ | |
313a3dc7 | 135 | void vcpu_load(struct kvm_vcpu *vcpu) |
6aa8b732 | 136 | { |
15ad7146 AK |
137 | int cpu; |
138 | ||
bccf2150 | 139 | mutex_lock(&vcpu->mutex); |
15ad7146 AK |
140 | cpu = get_cpu(); |
141 | preempt_notifier_register(&vcpu->preempt_notifier); | |
313a3dc7 | 142 | kvm_arch_vcpu_load(vcpu, cpu); |
15ad7146 | 143 | put_cpu(); |
6aa8b732 AK |
144 | } |
145 | ||
313a3dc7 | 146 | void vcpu_put(struct kvm_vcpu *vcpu) |
6aa8b732 | 147 | { |
15ad7146 | 148 | preempt_disable(); |
313a3dc7 | 149 | kvm_arch_vcpu_put(vcpu); |
15ad7146 AK |
150 | preempt_notifier_unregister(&vcpu->preempt_notifier); |
151 | preempt_enable(); | |
6aa8b732 AK |
152 | mutex_unlock(&vcpu->mutex); |
153 | } | |
154 | ||
d9e368d6 AK |
155 | static void ack_flush(void *_completed) |
156 | { | |
d9e368d6 AK |
157 | } |
158 | ||
49846896 | 159 | static bool make_all_cpus_request(struct kvm *kvm, unsigned int req) |
d9e368d6 | 160 | { |
597a5f55 | 161 | int i, cpu, me; |
6ef7a1bc RR |
162 | cpumask_var_t cpus; |
163 | bool called = true; | |
d9e368d6 | 164 | struct kvm_vcpu *vcpu; |
d9e368d6 | 165 | |
79f55997 | 166 | zalloc_cpumask_var(&cpus, GFP_ATOMIC); |
6ef7a1bc | 167 | |
3cba4130 | 168 | me = get_cpu(); |
988a2cae | 169 | kvm_for_each_vcpu(i, vcpu, kvm) { |
3cba4130 | 170 | kvm_make_request(req, vcpu); |
d9e368d6 | 171 | cpu = vcpu->cpu; |
6b7e2d09 XG |
172 | |
173 | /* Set ->requests bit before we read ->mode */ | |
174 | smp_mb(); | |
175 | ||
176 | if (cpus != NULL && cpu != -1 && cpu != me && | |
177 | kvm_vcpu_exiting_guest_mode(vcpu) != OUTSIDE_GUEST_MODE) | |
6ef7a1bc | 178 | cpumask_set_cpu(cpu, cpus); |
49846896 | 179 | } |
6ef7a1bc RR |
180 | if (unlikely(cpus == NULL)) |
181 | smp_call_function_many(cpu_online_mask, ack_flush, NULL, 1); | |
182 | else if (!cpumask_empty(cpus)) | |
183 | smp_call_function_many(cpus, ack_flush, NULL, 1); | |
184 | else | |
185 | called = false; | |
3cba4130 | 186 | put_cpu(); |
6ef7a1bc | 187 | free_cpumask_var(cpus); |
49846896 | 188 | return called; |
d9e368d6 AK |
189 | } |
190 | ||
49846896 | 191 | void kvm_flush_remote_tlbs(struct kvm *kvm) |
2e53d63a | 192 | { |
a4ee1ca4 XG |
193 | int dirty_count = kvm->tlbs_dirty; |
194 | ||
195 | smp_mb(); | |
49846896 RR |
196 | if (make_all_cpus_request(kvm, KVM_REQ_TLB_FLUSH)) |
197 | ++kvm->stat.remote_tlb_flush; | |
a4ee1ca4 | 198 | cmpxchg(&kvm->tlbs_dirty, dirty_count, 0); |
2e53d63a MT |
199 | } |
200 | ||
49846896 RR |
201 | void kvm_reload_remote_mmus(struct kvm *kvm) |
202 | { | |
203 | make_all_cpus_request(kvm, KVM_REQ_MMU_RELOAD); | |
204 | } | |
2e53d63a | 205 | |
fb3f0f51 RR |
206 | int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id) |
207 | { | |
208 | struct page *page; | |
209 | int r; | |
210 | ||
211 | mutex_init(&vcpu->mutex); | |
212 | vcpu->cpu = -1; | |
fb3f0f51 RR |
213 | vcpu->kvm = kvm; |
214 | vcpu->vcpu_id = id; | |
b6958ce4 | 215 | init_waitqueue_head(&vcpu->wq); |
af585b92 | 216 | kvm_async_pf_vcpu_init(vcpu); |
fb3f0f51 RR |
217 | |
218 | page = alloc_page(GFP_KERNEL | __GFP_ZERO); | |
219 | if (!page) { | |
220 | r = -ENOMEM; | |
221 | goto fail; | |
222 | } | |
223 | vcpu->run = page_address(page); | |
224 | ||
e9b11c17 | 225 | r = kvm_arch_vcpu_init(vcpu); |
fb3f0f51 | 226 | if (r < 0) |
e9b11c17 | 227 | goto fail_free_run; |
fb3f0f51 RR |
228 | return 0; |
229 | ||
fb3f0f51 RR |
230 | fail_free_run: |
231 | free_page((unsigned long)vcpu->run); | |
232 | fail: | |
76fafa5e | 233 | return r; |
fb3f0f51 RR |
234 | } |
235 | EXPORT_SYMBOL_GPL(kvm_vcpu_init); | |
236 | ||
237 | void kvm_vcpu_uninit(struct kvm_vcpu *vcpu) | |
238 | { | |
e9b11c17 | 239 | kvm_arch_vcpu_uninit(vcpu); |
fb3f0f51 RR |
240 | free_page((unsigned long)vcpu->run); |
241 | } | |
242 | EXPORT_SYMBOL_GPL(kvm_vcpu_uninit); | |
243 | ||
e930bffe AA |
244 | #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER) |
245 | static inline struct kvm *mmu_notifier_to_kvm(struct mmu_notifier *mn) | |
246 | { | |
247 | return container_of(mn, struct kvm, mmu_notifier); | |
248 | } | |
249 | ||
250 | static void kvm_mmu_notifier_invalidate_page(struct mmu_notifier *mn, | |
251 | struct mm_struct *mm, | |
252 | unsigned long address) | |
253 | { | |
254 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
bc6678a3 | 255 | int need_tlb_flush, idx; |
e930bffe AA |
256 | |
257 | /* | |
258 | * When ->invalidate_page runs, the linux pte has been zapped | |
259 | * already but the page is still allocated until | |
260 | * ->invalidate_page returns. So if we increase the sequence | |
261 | * here the kvm page fault will notice if the spte can't be | |
262 | * established because the page is going to be freed. If | |
263 | * instead the kvm page fault establishes the spte before | |
264 | * ->invalidate_page runs, kvm_unmap_hva will release it | |
265 | * before returning. | |
266 | * | |
267 | * The sequence increase only need to be seen at spin_unlock | |
268 | * time, and not at spin_lock time. | |
269 | * | |
270 | * Increasing the sequence after the spin_unlock would be | |
271 | * unsafe because the kvm page fault could then establish the | |
272 | * pte after kvm_unmap_hva returned, without noticing the page | |
273 | * is going to be freed. | |
274 | */ | |
bc6678a3 | 275 | idx = srcu_read_lock(&kvm->srcu); |
e930bffe AA |
276 | spin_lock(&kvm->mmu_lock); |
277 | kvm->mmu_notifier_seq++; | |
a4ee1ca4 | 278 | need_tlb_flush = kvm_unmap_hva(kvm, address) | kvm->tlbs_dirty; |
e930bffe | 279 | spin_unlock(&kvm->mmu_lock); |
bc6678a3 | 280 | srcu_read_unlock(&kvm->srcu, idx); |
e930bffe AA |
281 | |
282 | /* we've to flush the tlb before the pages can be freed */ | |
283 | if (need_tlb_flush) | |
284 | kvm_flush_remote_tlbs(kvm); | |
285 | ||
286 | } | |
287 | ||
3da0dd43 IE |
288 | static void kvm_mmu_notifier_change_pte(struct mmu_notifier *mn, |
289 | struct mm_struct *mm, | |
290 | unsigned long address, | |
291 | pte_t pte) | |
292 | { | |
293 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
bc6678a3 | 294 | int idx; |
3da0dd43 | 295 | |
bc6678a3 | 296 | idx = srcu_read_lock(&kvm->srcu); |
3da0dd43 IE |
297 | spin_lock(&kvm->mmu_lock); |
298 | kvm->mmu_notifier_seq++; | |
299 | kvm_set_spte_hva(kvm, address, pte); | |
300 | spin_unlock(&kvm->mmu_lock); | |
bc6678a3 | 301 | srcu_read_unlock(&kvm->srcu, idx); |
3da0dd43 IE |
302 | } |
303 | ||
e930bffe AA |
304 | static void kvm_mmu_notifier_invalidate_range_start(struct mmu_notifier *mn, |
305 | struct mm_struct *mm, | |
306 | unsigned long start, | |
307 | unsigned long end) | |
308 | { | |
309 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
bc6678a3 | 310 | int need_tlb_flush = 0, idx; |
e930bffe | 311 | |
bc6678a3 | 312 | idx = srcu_read_lock(&kvm->srcu); |
e930bffe AA |
313 | spin_lock(&kvm->mmu_lock); |
314 | /* | |
315 | * The count increase must become visible at unlock time as no | |
316 | * spte can be established without taking the mmu_lock and | |
317 | * count is also read inside the mmu_lock critical section. | |
318 | */ | |
319 | kvm->mmu_notifier_count++; | |
320 | for (; start < end; start += PAGE_SIZE) | |
321 | need_tlb_flush |= kvm_unmap_hva(kvm, start); | |
a4ee1ca4 | 322 | need_tlb_flush |= kvm->tlbs_dirty; |
e930bffe | 323 | spin_unlock(&kvm->mmu_lock); |
bc6678a3 | 324 | srcu_read_unlock(&kvm->srcu, idx); |
e930bffe AA |
325 | |
326 | /* we've to flush the tlb before the pages can be freed */ | |
327 | if (need_tlb_flush) | |
328 | kvm_flush_remote_tlbs(kvm); | |
329 | } | |
330 | ||
331 | static void kvm_mmu_notifier_invalidate_range_end(struct mmu_notifier *mn, | |
332 | struct mm_struct *mm, | |
333 | unsigned long start, | |
334 | unsigned long end) | |
335 | { | |
336 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
337 | ||
338 | spin_lock(&kvm->mmu_lock); | |
339 | /* | |
340 | * This sequence increase will notify the kvm page fault that | |
341 | * the page that is going to be mapped in the spte could have | |
342 | * been freed. | |
343 | */ | |
344 | kvm->mmu_notifier_seq++; | |
345 | /* | |
346 | * The above sequence increase must be visible before the | |
347 | * below count decrease but both values are read by the kvm | |
348 | * page fault under mmu_lock spinlock so we don't need to add | |
349 | * a smb_wmb() here in between the two. | |
350 | */ | |
351 | kvm->mmu_notifier_count--; | |
352 | spin_unlock(&kvm->mmu_lock); | |
353 | ||
354 | BUG_ON(kvm->mmu_notifier_count < 0); | |
355 | } | |
356 | ||
357 | static int kvm_mmu_notifier_clear_flush_young(struct mmu_notifier *mn, | |
358 | struct mm_struct *mm, | |
359 | unsigned long address) | |
360 | { | |
361 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
bc6678a3 | 362 | int young, idx; |
e930bffe | 363 | |
bc6678a3 | 364 | idx = srcu_read_lock(&kvm->srcu); |
e930bffe AA |
365 | spin_lock(&kvm->mmu_lock); |
366 | young = kvm_age_hva(kvm, address); | |
367 | spin_unlock(&kvm->mmu_lock); | |
bc6678a3 | 368 | srcu_read_unlock(&kvm->srcu, idx); |
e930bffe AA |
369 | |
370 | if (young) | |
371 | kvm_flush_remote_tlbs(kvm); | |
372 | ||
373 | return young; | |
374 | } | |
375 | ||
8ee53820 AA |
376 | static int kvm_mmu_notifier_test_young(struct mmu_notifier *mn, |
377 | struct mm_struct *mm, | |
378 | unsigned long address) | |
379 | { | |
380 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
381 | int young, idx; | |
382 | ||
383 | idx = srcu_read_lock(&kvm->srcu); | |
384 | spin_lock(&kvm->mmu_lock); | |
385 | young = kvm_test_age_hva(kvm, address); | |
386 | spin_unlock(&kvm->mmu_lock); | |
387 | srcu_read_unlock(&kvm->srcu, idx); | |
388 | ||
389 | return young; | |
390 | } | |
391 | ||
85db06e5 MT |
392 | static void kvm_mmu_notifier_release(struct mmu_notifier *mn, |
393 | struct mm_struct *mm) | |
394 | { | |
395 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
eda2beda LJ |
396 | int idx; |
397 | ||
398 | idx = srcu_read_lock(&kvm->srcu); | |
85db06e5 | 399 | kvm_arch_flush_shadow(kvm); |
eda2beda | 400 | srcu_read_unlock(&kvm->srcu, idx); |
85db06e5 MT |
401 | } |
402 | ||
e930bffe AA |
403 | static const struct mmu_notifier_ops kvm_mmu_notifier_ops = { |
404 | .invalidate_page = kvm_mmu_notifier_invalidate_page, | |
405 | .invalidate_range_start = kvm_mmu_notifier_invalidate_range_start, | |
406 | .invalidate_range_end = kvm_mmu_notifier_invalidate_range_end, | |
407 | .clear_flush_young = kvm_mmu_notifier_clear_flush_young, | |
8ee53820 | 408 | .test_young = kvm_mmu_notifier_test_young, |
3da0dd43 | 409 | .change_pte = kvm_mmu_notifier_change_pte, |
85db06e5 | 410 | .release = kvm_mmu_notifier_release, |
e930bffe | 411 | }; |
4c07b0a4 AK |
412 | |
413 | static int kvm_init_mmu_notifier(struct kvm *kvm) | |
414 | { | |
415 | kvm->mmu_notifier.ops = &kvm_mmu_notifier_ops; | |
416 | return mmu_notifier_register(&kvm->mmu_notifier, current->mm); | |
417 | } | |
418 | ||
419 | #else /* !(CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER) */ | |
420 | ||
421 | static int kvm_init_mmu_notifier(struct kvm *kvm) | |
422 | { | |
423 | return 0; | |
424 | } | |
425 | ||
e930bffe AA |
426 | #endif /* CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER */ |
427 | ||
f17abe9a | 428 | static struct kvm *kvm_create_vm(void) |
6aa8b732 | 429 | { |
d89f5eff JK |
430 | int r, i; |
431 | struct kvm *kvm = kvm_arch_alloc_vm(); | |
6aa8b732 | 432 | |
d89f5eff JK |
433 | if (!kvm) |
434 | return ERR_PTR(-ENOMEM); | |
435 | ||
436 | r = kvm_arch_init_vm(kvm); | |
437 | if (r) | |
438 | goto out_err_nodisable; | |
10474ae8 AG |
439 | |
440 | r = hardware_enable_all(); | |
441 | if (r) | |
442 | goto out_err_nodisable; | |
443 | ||
75858a84 AK |
444 | #ifdef CONFIG_HAVE_KVM_IRQCHIP |
445 | INIT_HLIST_HEAD(&kvm->mask_notifier_list); | |
136bdfee | 446 | INIT_HLIST_HEAD(&kvm->irq_ack_notifier_list); |
75858a84 | 447 | #endif |
6aa8b732 | 448 | |
46a26bf5 MT |
449 | r = -ENOMEM; |
450 | kvm->memslots = kzalloc(sizeof(struct kvm_memslots), GFP_KERNEL); | |
451 | if (!kvm->memslots) | |
57e7fbee | 452 | goto out_err_nosrcu; |
bc6678a3 | 453 | if (init_srcu_struct(&kvm->srcu)) |
57e7fbee | 454 | goto out_err_nosrcu; |
e93f8a0f MT |
455 | for (i = 0; i < KVM_NR_BUSES; i++) { |
456 | kvm->buses[i] = kzalloc(sizeof(struct kvm_io_bus), | |
457 | GFP_KERNEL); | |
57e7fbee | 458 | if (!kvm->buses[i]) |
e93f8a0f | 459 | goto out_err; |
e93f8a0f | 460 | } |
46a26bf5 | 461 | |
4c07b0a4 | 462 | r = kvm_init_mmu_notifier(kvm); |
57e7fbee | 463 | if (r) |
283d0c65 | 464 | goto out_err; |
e930bffe | 465 | |
6d4e4c4f AK |
466 | kvm->mm = current->mm; |
467 | atomic_inc(&kvm->mm->mm_count); | |
aaee2c94 | 468 | spin_lock_init(&kvm->mmu_lock); |
d34e6b17 | 469 | kvm_eventfd_init(kvm); |
11ec2804 | 470 | mutex_init(&kvm->lock); |
60eead79 | 471 | mutex_init(&kvm->irq_lock); |
79fac95e | 472 | mutex_init(&kvm->slots_lock); |
d39f13b0 | 473 | atomic_set(&kvm->users_count, 1); |
5e58cfe4 RR |
474 | spin_lock(&kvm_lock); |
475 | list_add(&kvm->vm_list, &vm_list); | |
476 | spin_unlock(&kvm_lock); | |
d89f5eff | 477 | |
f17abe9a | 478 | return kvm; |
10474ae8 AG |
479 | |
480 | out_err: | |
57e7fbee JK |
481 | cleanup_srcu_struct(&kvm->srcu); |
482 | out_err_nosrcu: | |
10474ae8 AG |
483 | hardware_disable_all(); |
484 | out_err_nodisable: | |
e93f8a0f MT |
485 | for (i = 0; i < KVM_NR_BUSES; i++) |
486 | kfree(kvm->buses[i]); | |
46a26bf5 | 487 | kfree(kvm->memslots); |
d89f5eff | 488 | kvm_arch_free_vm(kvm); |
10474ae8 | 489 | return ERR_PTR(r); |
f17abe9a AK |
490 | } |
491 | ||
a36a57b1 TY |
492 | static void kvm_destroy_dirty_bitmap(struct kvm_memory_slot *memslot) |
493 | { | |
494 | if (!memslot->dirty_bitmap) | |
495 | return; | |
496 | ||
6f9e5c17 TY |
497 | if (2 * kvm_dirty_bitmap_bytes(memslot) > PAGE_SIZE) |
498 | vfree(memslot->dirty_bitmap_head); | |
499 | else | |
500 | kfree(memslot->dirty_bitmap_head); | |
501 | ||
a36a57b1 | 502 | memslot->dirty_bitmap = NULL; |
515a0127 | 503 | memslot->dirty_bitmap_head = NULL; |
a36a57b1 TY |
504 | } |
505 | ||
6aa8b732 AK |
506 | /* |
507 | * Free any memory in @free but not in @dont. | |
508 | */ | |
509 | static void kvm_free_physmem_slot(struct kvm_memory_slot *free, | |
510 | struct kvm_memory_slot *dont) | |
511 | { | |
ec04b260 JR |
512 | int i; |
513 | ||
290fc38d IE |
514 | if (!dont || free->rmap != dont->rmap) |
515 | vfree(free->rmap); | |
6aa8b732 AK |
516 | |
517 | if (!dont || free->dirty_bitmap != dont->dirty_bitmap) | |
a36a57b1 | 518 | kvm_destroy_dirty_bitmap(free); |
6aa8b732 | 519 | |
ec04b260 JR |
520 | |
521 | for (i = 0; i < KVM_NR_PAGE_SIZES - 1; ++i) { | |
522 | if (!dont || free->lpage_info[i] != dont->lpage_info[i]) { | |
523 | vfree(free->lpage_info[i]); | |
524 | free->lpage_info[i] = NULL; | |
525 | } | |
526 | } | |
05da4558 | 527 | |
6aa8b732 | 528 | free->npages = 0; |
8d4e1288 | 529 | free->rmap = NULL; |
6aa8b732 AK |
530 | } |
531 | ||
d19a9cd2 | 532 | void kvm_free_physmem(struct kvm *kvm) |
6aa8b732 AK |
533 | { |
534 | int i; | |
46a26bf5 MT |
535 | struct kvm_memslots *slots = kvm->memslots; |
536 | ||
537 | for (i = 0; i < slots->nmemslots; ++i) | |
538 | kvm_free_physmem_slot(&slots->memslots[i], NULL); | |
6aa8b732 | 539 | |
46a26bf5 | 540 | kfree(kvm->memslots); |
6aa8b732 AK |
541 | } |
542 | ||
f17abe9a AK |
543 | static void kvm_destroy_vm(struct kvm *kvm) |
544 | { | |
e93f8a0f | 545 | int i; |
6d4e4c4f AK |
546 | struct mm_struct *mm = kvm->mm; |
547 | ||
ad8ba2cd | 548 | kvm_arch_sync_events(kvm); |
133de902 AK |
549 | spin_lock(&kvm_lock); |
550 | list_del(&kvm->vm_list); | |
551 | spin_unlock(&kvm_lock); | |
399ec807 | 552 | kvm_free_irq_routing(kvm); |
e93f8a0f MT |
553 | for (i = 0; i < KVM_NR_BUSES; i++) |
554 | kvm_io_bus_destroy(kvm->buses[i]); | |
980da6ce | 555 | kvm_coalesced_mmio_free(kvm); |
e930bffe AA |
556 | #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER) |
557 | mmu_notifier_unregister(&kvm->mmu_notifier, kvm->mm); | |
f00be0ca GN |
558 | #else |
559 | kvm_arch_flush_shadow(kvm); | |
5f94c174 | 560 | #endif |
d19a9cd2 | 561 | kvm_arch_destroy_vm(kvm); |
d89f5eff JK |
562 | kvm_free_physmem(kvm); |
563 | cleanup_srcu_struct(&kvm->srcu); | |
564 | kvm_arch_free_vm(kvm); | |
10474ae8 | 565 | hardware_disable_all(); |
6d4e4c4f | 566 | mmdrop(mm); |
f17abe9a AK |
567 | } |
568 | ||
d39f13b0 IE |
569 | void kvm_get_kvm(struct kvm *kvm) |
570 | { | |
571 | atomic_inc(&kvm->users_count); | |
572 | } | |
573 | EXPORT_SYMBOL_GPL(kvm_get_kvm); | |
574 | ||
575 | void kvm_put_kvm(struct kvm *kvm) | |
576 | { | |
577 | if (atomic_dec_and_test(&kvm->users_count)) | |
578 | kvm_destroy_vm(kvm); | |
579 | } | |
580 | EXPORT_SYMBOL_GPL(kvm_put_kvm); | |
581 | ||
582 | ||
f17abe9a AK |
583 | static int kvm_vm_release(struct inode *inode, struct file *filp) |
584 | { | |
585 | struct kvm *kvm = filp->private_data; | |
586 | ||
721eecbf GH |
587 | kvm_irqfd_release(kvm); |
588 | ||
d39f13b0 | 589 | kvm_put_kvm(kvm); |
6aa8b732 AK |
590 | return 0; |
591 | } | |
592 | ||
d48ead8b | 593 | #ifndef CONFIG_S390 |
515a0127 TY |
594 | /* |
595 | * Allocation size is twice as large as the actual dirty bitmap size. | |
596 | * This makes it possible to do double buffering: see x86's | |
597 | * kvm_vm_ioctl_get_dirty_log(). | |
598 | */ | |
a36a57b1 TY |
599 | static int kvm_create_dirty_bitmap(struct kvm_memory_slot *memslot) |
600 | { | |
515a0127 | 601 | unsigned long dirty_bytes = 2 * kvm_dirty_bitmap_bytes(memslot); |
a36a57b1 | 602 | |
6f9e5c17 TY |
603 | if (dirty_bytes > PAGE_SIZE) |
604 | memslot->dirty_bitmap = vzalloc(dirty_bytes); | |
605 | else | |
606 | memslot->dirty_bitmap = kzalloc(dirty_bytes, GFP_KERNEL); | |
607 | ||
a36a57b1 TY |
608 | if (!memslot->dirty_bitmap) |
609 | return -ENOMEM; | |
610 | ||
515a0127 | 611 | memslot->dirty_bitmap_head = memslot->dirty_bitmap; |
a36a57b1 TY |
612 | return 0; |
613 | } | |
d48ead8b | 614 | #endif /* !CONFIG_S390 */ |
a36a57b1 | 615 | |
6aa8b732 AK |
616 | /* |
617 | * Allocate some memory and give it an address in the guest physical address | |
618 | * space. | |
619 | * | |
620 | * Discontiguous memory is allowed, mostly for framebuffers. | |
f78e0e2e | 621 | * |
10589a46 | 622 | * Must be called holding mmap_sem for write. |
6aa8b732 | 623 | */ |
f78e0e2e SY |
624 | int __kvm_set_memory_region(struct kvm *kvm, |
625 | struct kvm_userspace_memory_region *mem, | |
626 | int user_alloc) | |
6aa8b732 | 627 | { |
8234b22e | 628 | int r; |
6aa8b732 | 629 | gfn_t base_gfn; |
28bcb112 HC |
630 | unsigned long npages; |
631 | unsigned long i; | |
6aa8b732 AK |
632 | struct kvm_memory_slot *memslot; |
633 | struct kvm_memory_slot old, new; | |
bc6678a3 | 634 | struct kvm_memslots *slots, *old_memslots; |
6aa8b732 AK |
635 | |
636 | r = -EINVAL; | |
637 | /* General sanity checks */ | |
638 | if (mem->memory_size & (PAGE_SIZE - 1)) | |
639 | goto out; | |
640 | if (mem->guest_phys_addr & (PAGE_SIZE - 1)) | |
641 | goto out; | |
e7cacd40 | 642 | if (user_alloc && (mem->userspace_addr & (PAGE_SIZE - 1))) |
78749809 | 643 | goto out; |
e0d62c7f | 644 | if (mem->slot >= KVM_MEMORY_SLOTS + KVM_PRIVATE_MEM_SLOTS) |
6aa8b732 AK |
645 | goto out; |
646 | if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr) | |
647 | goto out; | |
648 | ||
46a26bf5 | 649 | memslot = &kvm->memslots->memslots[mem->slot]; |
6aa8b732 AK |
650 | base_gfn = mem->guest_phys_addr >> PAGE_SHIFT; |
651 | npages = mem->memory_size >> PAGE_SHIFT; | |
652 | ||
660c22c4 TY |
653 | r = -EINVAL; |
654 | if (npages > KVM_MEM_MAX_NR_PAGES) | |
655 | goto out; | |
656 | ||
6aa8b732 AK |
657 | if (!npages) |
658 | mem->flags &= ~KVM_MEM_LOG_DIRTY_PAGES; | |
659 | ||
6aa8b732 AK |
660 | new = old = *memslot; |
661 | ||
e36d96f7 | 662 | new.id = mem->slot; |
6aa8b732 AK |
663 | new.base_gfn = base_gfn; |
664 | new.npages = npages; | |
665 | new.flags = mem->flags; | |
666 | ||
667 | /* Disallow changing a memory slot's size. */ | |
668 | r = -EINVAL; | |
669 | if (npages && old.npages && npages != old.npages) | |
f78e0e2e | 670 | goto out_free; |
6aa8b732 AK |
671 | |
672 | /* Check for overlaps */ | |
673 | r = -EEXIST; | |
674 | for (i = 0; i < KVM_MEMORY_SLOTS; ++i) { | |
46a26bf5 | 675 | struct kvm_memory_slot *s = &kvm->memslots->memslots[i]; |
6aa8b732 | 676 | |
4cd481f6 | 677 | if (s == memslot || !s->npages) |
6aa8b732 AK |
678 | continue; |
679 | if (!((base_gfn + npages <= s->base_gfn) || | |
680 | (base_gfn >= s->base_gfn + s->npages))) | |
f78e0e2e | 681 | goto out_free; |
6aa8b732 | 682 | } |
6aa8b732 | 683 | |
6aa8b732 AK |
684 | /* Free page dirty bitmap if unneeded */ |
685 | if (!(new.flags & KVM_MEM_LOG_DIRTY_PAGES)) | |
8b6d44c7 | 686 | new.dirty_bitmap = NULL; |
6aa8b732 AK |
687 | |
688 | r = -ENOMEM; | |
689 | ||
690 | /* Allocate if a slot is being created */ | |
eff0114a | 691 | #ifndef CONFIG_S390 |
8d4e1288 | 692 | if (npages && !new.rmap) { |
26535037 | 693 | new.rmap = vzalloc(npages * sizeof(*new.rmap)); |
290fc38d IE |
694 | |
695 | if (!new.rmap) | |
f78e0e2e | 696 | goto out_free; |
290fc38d | 697 | |
80b14b5b | 698 | new.user_alloc = user_alloc; |
bc6678a3 | 699 | new.userspace_addr = mem->userspace_addr; |
6aa8b732 | 700 | } |
ec04b260 JR |
701 | if (!npages) |
702 | goto skip_lpage; | |
05da4558 | 703 | |
ec04b260 | 704 | for (i = 0; i < KVM_NR_PAGE_SIZES - 1; ++i) { |
28bcb112 HC |
705 | unsigned long ugfn; |
706 | unsigned long j; | |
707 | int lpages; | |
ec04b260 | 708 | int level = i + 2; |
05da4558 | 709 | |
ec04b260 JR |
710 | /* Avoid unused variable warning if no large pages */ |
711 | (void)level; | |
712 | ||
713 | if (new.lpage_info[i]) | |
714 | continue; | |
715 | ||
82855413 JR |
716 | lpages = 1 + ((base_gfn + npages - 1) |
717 | >> KVM_HPAGE_GFN_SHIFT(level)); | |
718 | lpages -= base_gfn >> KVM_HPAGE_GFN_SHIFT(level); | |
ec04b260 | 719 | |
26535037 | 720 | new.lpage_info[i] = vzalloc(lpages * sizeof(*new.lpage_info[i])); |
ec04b260 JR |
721 | |
722 | if (!new.lpage_info[i]) | |
05da4558 MT |
723 | goto out_free; |
724 | ||
82855413 | 725 | if (base_gfn & (KVM_PAGES_PER_HPAGE(level) - 1)) |
ec04b260 | 726 | new.lpage_info[i][0].write_count = 1; |
82855413 | 727 | if ((base_gfn+npages) & (KVM_PAGES_PER_HPAGE(level) - 1)) |
ec04b260 | 728 | new.lpage_info[i][lpages - 1].write_count = 1; |
ac04527f AK |
729 | ugfn = new.userspace_addr >> PAGE_SHIFT; |
730 | /* | |
731 | * If the gfn and userspace address are not aligned wrt each | |
54dee993 MT |
732 | * other, or if explicitly asked to, disable large page |
733 | * support for this slot | |
ac04527f | 734 | */ |
ec04b260 | 735 | if ((base_gfn ^ ugfn) & (KVM_PAGES_PER_HPAGE(level) - 1) || |
54dee993 | 736 | !largepages_enabled) |
ec04b260 JR |
737 | for (j = 0; j < lpages; ++j) |
738 | new.lpage_info[i][j].write_count = 1; | |
05da4558 | 739 | } |
6aa8b732 | 740 | |
ec04b260 JR |
741 | skip_lpage: |
742 | ||
6aa8b732 AK |
743 | /* Allocate page dirty bitmap if needed */ |
744 | if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) { | |
a36a57b1 | 745 | if (kvm_create_dirty_bitmap(&new) < 0) |
f78e0e2e | 746 | goto out_free; |
bc6678a3 | 747 | /* destroy any largepage mappings for dirty tracking */ |
6aa8b732 | 748 | } |
3eea8437 CB |
749 | #else /* not defined CONFIG_S390 */ |
750 | new.user_alloc = user_alloc; | |
751 | if (user_alloc) | |
752 | new.userspace_addr = mem->userspace_addr; | |
eff0114a | 753 | #endif /* not defined CONFIG_S390 */ |
6aa8b732 | 754 | |
bc6678a3 MT |
755 | if (!npages) { |
756 | r = -ENOMEM; | |
757 | slots = kzalloc(sizeof(struct kvm_memslots), GFP_KERNEL); | |
758 | if (!slots) | |
759 | goto out_free; | |
760 | memcpy(slots, kvm->memslots, sizeof(struct kvm_memslots)); | |
761 | if (mem->slot >= slots->nmemslots) | |
762 | slots->nmemslots = mem->slot + 1; | |
49c7754c | 763 | slots->generation++; |
bc6678a3 MT |
764 | slots->memslots[mem->slot].flags |= KVM_MEMSLOT_INVALID; |
765 | ||
766 | old_memslots = kvm->memslots; | |
767 | rcu_assign_pointer(kvm->memslots, slots); | |
768 | synchronize_srcu_expedited(&kvm->srcu); | |
769 | /* From this point no new shadow pages pointing to a deleted | |
770 | * memslot will be created. | |
771 | * | |
772 | * validation of sp->gfn happens in: | |
773 | * - gfn_to_hva (kvm_read_guest, gfn_to_pfn) | |
774 | * - kvm_is_visible_gfn (mmu_check_roots) | |
775 | */ | |
34d4cb8f | 776 | kvm_arch_flush_shadow(kvm); |
bc6678a3 MT |
777 | kfree(old_memslots); |
778 | } | |
34d4cb8f | 779 | |
f7784b8e MT |
780 | r = kvm_arch_prepare_memory_region(kvm, &new, old, mem, user_alloc); |
781 | if (r) | |
782 | goto out_free; | |
783 | ||
bc6678a3 MT |
784 | /* map the pages in iommu page table */ |
785 | if (npages) { | |
786 | r = kvm_iommu_map_pages(kvm, &new); | |
787 | if (r) | |
788 | goto out_free; | |
789 | } | |
604b38ac | 790 | |
bc6678a3 MT |
791 | r = -ENOMEM; |
792 | slots = kzalloc(sizeof(struct kvm_memslots), GFP_KERNEL); | |
793 | if (!slots) | |
794 | goto out_free; | |
795 | memcpy(slots, kvm->memslots, sizeof(struct kvm_memslots)); | |
796 | if (mem->slot >= slots->nmemslots) | |
797 | slots->nmemslots = mem->slot + 1; | |
49c7754c | 798 | slots->generation++; |
bc6678a3 MT |
799 | |
800 | /* actual memory is freed via old in kvm_free_physmem_slot below */ | |
801 | if (!npages) { | |
802 | new.rmap = NULL; | |
803 | new.dirty_bitmap = NULL; | |
804 | for (i = 0; i < KVM_NR_PAGE_SIZES - 1; ++i) | |
805 | new.lpage_info[i] = NULL; | |
806 | } | |
807 | ||
808 | slots->memslots[mem->slot] = new; | |
809 | old_memslots = kvm->memslots; | |
810 | rcu_assign_pointer(kvm->memslots, slots); | |
811 | synchronize_srcu_expedited(&kvm->srcu); | |
3ad82a7e | 812 | |
f7784b8e | 813 | kvm_arch_commit_memory_region(kvm, mem, old, user_alloc); |
82ce2c96 | 814 | |
bc6678a3 MT |
815 | kvm_free_physmem_slot(&old, &new); |
816 | kfree(old_memslots); | |
817 | ||
6aa8b732 AK |
818 | return 0; |
819 | ||
f78e0e2e | 820 | out_free: |
6aa8b732 AK |
821 | kvm_free_physmem_slot(&new, &old); |
822 | out: | |
823 | return r; | |
210c7c4d IE |
824 | |
825 | } | |
f78e0e2e SY |
826 | EXPORT_SYMBOL_GPL(__kvm_set_memory_region); |
827 | ||
828 | int kvm_set_memory_region(struct kvm *kvm, | |
829 | struct kvm_userspace_memory_region *mem, | |
830 | int user_alloc) | |
831 | { | |
832 | int r; | |
833 | ||
79fac95e | 834 | mutex_lock(&kvm->slots_lock); |
f78e0e2e | 835 | r = __kvm_set_memory_region(kvm, mem, user_alloc); |
79fac95e | 836 | mutex_unlock(&kvm->slots_lock); |
f78e0e2e SY |
837 | return r; |
838 | } | |
210c7c4d IE |
839 | EXPORT_SYMBOL_GPL(kvm_set_memory_region); |
840 | ||
1fe779f8 CO |
841 | int kvm_vm_ioctl_set_memory_region(struct kvm *kvm, |
842 | struct | |
843 | kvm_userspace_memory_region *mem, | |
844 | int user_alloc) | |
210c7c4d | 845 | { |
e0d62c7f IE |
846 | if (mem->slot >= KVM_MEMORY_SLOTS) |
847 | return -EINVAL; | |
210c7c4d | 848 | return kvm_set_memory_region(kvm, mem, user_alloc); |
6aa8b732 AK |
849 | } |
850 | ||
5bb064dc ZX |
851 | int kvm_get_dirty_log(struct kvm *kvm, |
852 | struct kvm_dirty_log *log, int *is_dirty) | |
6aa8b732 AK |
853 | { |
854 | struct kvm_memory_slot *memslot; | |
855 | int r, i; | |
87bf6e7d | 856 | unsigned long n; |
6aa8b732 AK |
857 | unsigned long any = 0; |
858 | ||
6aa8b732 AK |
859 | r = -EINVAL; |
860 | if (log->slot >= KVM_MEMORY_SLOTS) | |
861 | goto out; | |
862 | ||
46a26bf5 | 863 | memslot = &kvm->memslots->memslots[log->slot]; |
6aa8b732 AK |
864 | r = -ENOENT; |
865 | if (!memslot->dirty_bitmap) | |
866 | goto out; | |
867 | ||
87bf6e7d | 868 | n = kvm_dirty_bitmap_bytes(memslot); |
6aa8b732 | 869 | |
cd1a4a98 | 870 | for (i = 0; !any && i < n/sizeof(long); ++i) |
6aa8b732 AK |
871 | any = memslot->dirty_bitmap[i]; |
872 | ||
873 | r = -EFAULT; | |
874 | if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n)) | |
875 | goto out; | |
876 | ||
5bb064dc ZX |
877 | if (any) |
878 | *is_dirty = 1; | |
6aa8b732 AK |
879 | |
880 | r = 0; | |
6aa8b732 | 881 | out: |
6aa8b732 AK |
882 | return r; |
883 | } | |
884 | ||
54dee993 MT |
885 | void kvm_disable_largepages(void) |
886 | { | |
887 | largepages_enabled = false; | |
888 | } | |
889 | EXPORT_SYMBOL_GPL(kvm_disable_largepages); | |
890 | ||
cea7bb21 IE |
891 | int is_error_page(struct page *page) |
892 | { | |
edba23e5 | 893 | return page == bad_page || page == hwpoison_page || page == fault_page; |
cea7bb21 IE |
894 | } |
895 | EXPORT_SYMBOL_GPL(is_error_page); | |
896 | ||
35149e21 AL |
897 | int is_error_pfn(pfn_t pfn) |
898 | { | |
edba23e5 | 899 | return pfn == bad_pfn || pfn == hwpoison_pfn || pfn == fault_pfn; |
35149e21 AL |
900 | } |
901 | EXPORT_SYMBOL_GPL(is_error_pfn); | |
902 | ||
bf998156 HY |
903 | int is_hwpoison_pfn(pfn_t pfn) |
904 | { | |
905 | return pfn == hwpoison_pfn; | |
906 | } | |
907 | EXPORT_SYMBOL_GPL(is_hwpoison_pfn); | |
908 | ||
edba23e5 GN |
909 | int is_fault_pfn(pfn_t pfn) |
910 | { | |
911 | return pfn == fault_pfn; | |
912 | } | |
913 | EXPORT_SYMBOL_GPL(is_fault_pfn); | |
914 | ||
f9d46eb0 IE |
915 | static inline unsigned long bad_hva(void) |
916 | { | |
917 | return PAGE_OFFSET; | |
918 | } | |
919 | ||
920 | int kvm_is_error_hva(unsigned long addr) | |
921 | { | |
922 | return addr == bad_hva(); | |
923 | } | |
924 | EXPORT_SYMBOL_GPL(kvm_is_error_hva); | |
925 | ||
49c7754c GN |
926 | static struct kvm_memory_slot *__gfn_to_memslot(struct kvm_memslots *slots, |
927 | gfn_t gfn) | |
6aa8b732 AK |
928 | { |
929 | int i; | |
930 | ||
46a26bf5 MT |
931 | for (i = 0; i < slots->nmemslots; ++i) { |
932 | struct kvm_memory_slot *memslot = &slots->memslots[i]; | |
6aa8b732 AK |
933 | |
934 | if (gfn >= memslot->base_gfn | |
935 | && gfn < memslot->base_gfn + memslot->npages) | |
936 | return memslot; | |
937 | } | |
8b6d44c7 | 938 | return NULL; |
6aa8b732 | 939 | } |
49c7754c GN |
940 | |
941 | struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn) | |
942 | { | |
943 | return __gfn_to_memslot(kvm_memslots(kvm), gfn); | |
944 | } | |
a1f4d395 | 945 | EXPORT_SYMBOL_GPL(gfn_to_memslot); |
6aa8b732 | 946 | |
e0d62c7f IE |
947 | int kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn) |
948 | { | |
949 | int i; | |
90d83dc3 | 950 | struct kvm_memslots *slots = kvm_memslots(kvm); |
e0d62c7f | 951 | |
e0d62c7f | 952 | for (i = 0; i < KVM_MEMORY_SLOTS; ++i) { |
46a26bf5 | 953 | struct kvm_memory_slot *memslot = &slots->memslots[i]; |
e0d62c7f | 954 | |
bc6678a3 MT |
955 | if (memslot->flags & KVM_MEMSLOT_INVALID) |
956 | continue; | |
957 | ||
e0d62c7f IE |
958 | if (gfn >= memslot->base_gfn |
959 | && gfn < memslot->base_gfn + memslot->npages) | |
960 | return 1; | |
961 | } | |
962 | return 0; | |
963 | } | |
964 | EXPORT_SYMBOL_GPL(kvm_is_visible_gfn); | |
965 | ||
8f0b1ab6 JR |
966 | unsigned long kvm_host_page_size(struct kvm *kvm, gfn_t gfn) |
967 | { | |
968 | struct vm_area_struct *vma; | |
969 | unsigned long addr, size; | |
970 | ||
971 | size = PAGE_SIZE; | |
972 | ||
973 | addr = gfn_to_hva(kvm, gfn); | |
974 | if (kvm_is_error_hva(addr)) | |
975 | return PAGE_SIZE; | |
976 | ||
977 | down_read(¤t->mm->mmap_sem); | |
978 | vma = find_vma(current->mm, addr); | |
979 | if (!vma) | |
980 | goto out; | |
981 | ||
982 | size = vma_kernel_pagesize(vma); | |
983 | ||
984 | out: | |
985 | up_read(¤t->mm->mmap_sem); | |
986 | ||
987 | return size; | |
988 | } | |
989 | ||
bc6678a3 MT |
990 | int memslot_id(struct kvm *kvm, gfn_t gfn) |
991 | { | |
992 | int i; | |
90d83dc3 | 993 | struct kvm_memslots *slots = kvm_memslots(kvm); |
bc6678a3 MT |
994 | struct kvm_memory_slot *memslot = NULL; |
995 | ||
bc6678a3 MT |
996 | for (i = 0; i < slots->nmemslots; ++i) { |
997 | memslot = &slots->memslots[i]; | |
998 | ||
999 | if (gfn >= memslot->base_gfn | |
1000 | && gfn < memslot->base_gfn + memslot->npages) | |
1001 | break; | |
1002 | } | |
1003 | ||
1004 | return memslot - slots->memslots; | |
1005 | } | |
1006 | ||
49c7754c | 1007 | static unsigned long gfn_to_hva_many(struct kvm_memory_slot *slot, gfn_t gfn, |
48987781 | 1008 | gfn_t *nr_pages) |
539cb660 | 1009 | { |
bc6678a3 | 1010 | if (!slot || slot->flags & KVM_MEMSLOT_INVALID) |
539cb660 | 1011 | return bad_hva(); |
48987781 XG |
1012 | |
1013 | if (nr_pages) | |
1014 | *nr_pages = slot->npages - (gfn - slot->base_gfn); | |
1015 | ||
f5c98031 | 1016 | return gfn_to_hva_memslot(slot, gfn); |
539cb660 | 1017 | } |
48987781 XG |
1018 | |
1019 | unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn) | |
1020 | { | |
49c7754c | 1021 | return gfn_to_hva_many(gfn_to_memslot(kvm, gfn), gfn, NULL); |
48987781 | 1022 | } |
0d150298 | 1023 | EXPORT_SYMBOL_GPL(gfn_to_hva); |
539cb660 | 1024 | |
8030089f GN |
1025 | static pfn_t get_fault_pfn(void) |
1026 | { | |
1027 | get_page(fault_page); | |
1028 | return fault_pfn; | |
1029 | } | |
1030 | ||
fafc3dba HY |
1031 | static inline int check_user_page_hwpoison(unsigned long addr) |
1032 | { | |
1033 | int rc, flags = FOLL_TOUCH | FOLL_HWPOISON | FOLL_WRITE; | |
1034 | ||
1035 | rc = __get_user_pages(current, current->mm, addr, 1, | |
1036 | flags, NULL, NULL, NULL); | |
1037 | return rc == -EHWPOISON; | |
1038 | } | |
1039 | ||
af585b92 | 1040 | static pfn_t hva_to_pfn(struct kvm *kvm, unsigned long addr, bool atomic, |
612819c3 | 1041 | bool *async, bool write_fault, bool *writable) |
954bbbc2 | 1042 | { |
8d4e1288 | 1043 | struct page *page[1]; |
af585b92 | 1044 | int npages = 0; |
2e2e3738 | 1045 | pfn_t pfn; |
954bbbc2 | 1046 | |
af585b92 GN |
1047 | /* we can do it either atomically or asynchronously, not both */ |
1048 | BUG_ON(atomic && async); | |
1049 | ||
612819c3 MT |
1050 | BUG_ON(!write_fault && !writable); |
1051 | ||
1052 | if (writable) | |
1053 | *writable = true; | |
1054 | ||
af585b92 | 1055 | if (atomic || async) |
887c08ac | 1056 | npages = __get_user_pages_fast(addr, 1, 1, page); |
af585b92 GN |
1057 | |
1058 | if (unlikely(npages != 1) && !atomic) { | |
887c08ac | 1059 | might_sleep(); |
612819c3 MT |
1060 | |
1061 | if (writable) | |
1062 | *writable = write_fault; | |
1063 | ||
1064 | npages = get_user_pages_fast(addr, 1, write_fault, page); | |
1065 | ||
1066 | /* map read fault as writable if possible */ | |
1067 | if (unlikely(!write_fault) && npages == 1) { | |
1068 | struct page *wpage[1]; | |
1069 | ||
1070 | npages = __get_user_pages_fast(addr, 1, 1, wpage); | |
1071 | if (npages == 1) { | |
1072 | *writable = true; | |
1073 | put_page(page[0]); | |
1074 | page[0] = wpage[0]; | |
1075 | } | |
1076 | npages = 1; | |
1077 | } | |
887c08ac | 1078 | } |
539cb660 | 1079 | |
2e2e3738 AL |
1080 | if (unlikely(npages != 1)) { |
1081 | struct vm_area_struct *vma; | |
1082 | ||
887c08ac | 1083 | if (atomic) |
8030089f | 1084 | return get_fault_pfn(); |
887c08ac | 1085 | |
bbeb3406 | 1086 | down_read(¤t->mm->mmap_sem); |
fafc3dba | 1087 | if (check_user_page_hwpoison(addr)) { |
bbeb3406 | 1088 | up_read(¤t->mm->mmap_sem); |
bf998156 HY |
1089 | get_page(hwpoison_page); |
1090 | return page_to_pfn(hwpoison_page); | |
1091 | } | |
1092 | ||
8030089f | 1093 | vma = find_vma_intersection(current->mm, addr, addr+1); |
4c2155ce | 1094 | |
8030089f GN |
1095 | if (vma == NULL) |
1096 | pfn = get_fault_pfn(); | |
1097 | else if ((vma->vm_flags & VM_PFNMAP)) { | |
1098 | pfn = ((addr - vma->vm_start) >> PAGE_SHIFT) + | |
1099 | vma->vm_pgoff; | |
1100 | BUG_ON(!kvm_is_mmio_pfn(pfn)); | |
1101 | } else { | |
1102 | if (async && (vma->vm_flags & VM_WRITE)) | |
af585b92 | 1103 | *async = true; |
8030089f | 1104 | pfn = get_fault_pfn(); |
2e2e3738 | 1105 | } |
4c2155ce | 1106 | up_read(¤t->mm->mmap_sem); |
2e2e3738 AL |
1107 | } else |
1108 | pfn = page_to_pfn(page[0]); | |
8d4e1288 | 1109 | |
2e2e3738 | 1110 | return pfn; |
35149e21 AL |
1111 | } |
1112 | ||
887c08ac XG |
1113 | pfn_t hva_to_pfn_atomic(struct kvm *kvm, unsigned long addr) |
1114 | { | |
612819c3 | 1115 | return hva_to_pfn(kvm, addr, true, NULL, true, NULL); |
887c08ac XG |
1116 | } |
1117 | EXPORT_SYMBOL_GPL(hva_to_pfn_atomic); | |
1118 | ||
612819c3 MT |
1119 | static pfn_t __gfn_to_pfn(struct kvm *kvm, gfn_t gfn, bool atomic, bool *async, |
1120 | bool write_fault, bool *writable) | |
506f0d6f MT |
1121 | { |
1122 | unsigned long addr; | |
1123 | ||
af585b92 GN |
1124 | if (async) |
1125 | *async = false; | |
1126 | ||
506f0d6f MT |
1127 | addr = gfn_to_hva(kvm, gfn); |
1128 | if (kvm_is_error_hva(addr)) { | |
1129 | get_page(bad_page); | |
1130 | return page_to_pfn(bad_page); | |
1131 | } | |
1132 | ||
612819c3 | 1133 | return hva_to_pfn(kvm, addr, atomic, async, write_fault, writable); |
365fb3fd XG |
1134 | } |
1135 | ||
1136 | pfn_t gfn_to_pfn_atomic(struct kvm *kvm, gfn_t gfn) | |
1137 | { | |
612819c3 | 1138 | return __gfn_to_pfn(kvm, gfn, true, NULL, true, NULL); |
365fb3fd XG |
1139 | } |
1140 | EXPORT_SYMBOL_GPL(gfn_to_pfn_atomic); | |
1141 | ||
612819c3 MT |
1142 | pfn_t gfn_to_pfn_async(struct kvm *kvm, gfn_t gfn, bool *async, |
1143 | bool write_fault, bool *writable) | |
af585b92 | 1144 | { |
612819c3 | 1145 | return __gfn_to_pfn(kvm, gfn, false, async, write_fault, writable); |
af585b92 GN |
1146 | } |
1147 | EXPORT_SYMBOL_GPL(gfn_to_pfn_async); | |
1148 | ||
365fb3fd XG |
1149 | pfn_t gfn_to_pfn(struct kvm *kvm, gfn_t gfn) |
1150 | { | |
612819c3 | 1151 | return __gfn_to_pfn(kvm, gfn, false, NULL, true, NULL); |
506f0d6f | 1152 | } |
35149e21 AL |
1153 | EXPORT_SYMBOL_GPL(gfn_to_pfn); |
1154 | ||
612819c3 MT |
1155 | pfn_t gfn_to_pfn_prot(struct kvm *kvm, gfn_t gfn, bool write_fault, |
1156 | bool *writable) | |
1157 | { | |
1158 | return __gfn_to_pfn(kvm, gfn, false, NULL, write_fault, writable); | |
1159 | } | |
1160 | EXPORT_SYMBOL_GPL(gfn_to_pfn_prot); | |
1161 | ||
506f0d6f MT |
1162 | pfn_t gfn_to_pfn_memslot(struct kvm *kvm, |
1163 | struct kvm_memory_slot *slot, gfn_t gfn) | |
1164 | { | |
1165 | unsigned long addr = gfn_to_hva_memslot(slot, gfn); | |
612819c3 | 1166 | return hva_to_pfn(kvm, addr, false, NULL, true, NULL); |
506f0d6f MT |
1167 | } |
1168 | ||
48987781 XG |
1169 | int gfn_to_page_many_atomic(struct kvm *kvm, gfn_t gfn, struct page **pages, |
1170 | int nr_pages) | |
1171 | { | |
1172 | unsigned long addr; | |
1173 | gfn_t entry; | |
1174 | ||
49c7754c | 1175 | addr = gfn_to_hva_many(gfn_to_memslot(kvm, gfn), gfn, &entry); |
48987781 XG |
1176 | if (kvm_is_error_hva(addr)) |
1177 | return -1; | |
1178 | ||
1179 | if (entry < nr_pages) | |
1180 | return 0; | |
1181 | ||
1182 | return __get_user_pages_fast(addr, nr_pages, 1, pages); | |
1183 | } | |
1184 | EXPORT_SYMBOL_GPL(gfn_to_page_many_atomic); | |
1185 | ||
35149e21 AL |
1186 | struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn) |
1187 | { | |
2e2e3738 AL |
1188 | pfn_t pfn; |
1189 | ||
1190 | pfn = gfn_to_pfn(kvm, gfn); | |
c77fb9dc | 1191 | if (!kvm_is_mmio_pfn(pfn)) |
2e2e3738 AL |
1192 | return pfn_to_page(pfn); |
1193 | ||
c77fb9dc | 1194 | WARN_ON(kvm_is_mmio_pfn(pfn)); |
2e2e3738 AL |
1195 | |
1196 | get_page(bad_page); | |
1197 | return bad_page; | |
954bbbc2 | 1198 | } |
aab61cc0 | 1199 | |
954bbbc2 AK |
1200 | EXPORT_SYMBOL_GPL(gfn_to_page); |
1201 | ||
b4231d61 IE |
1202 | void kvm_release_page_clean(struct page *page) |
1203 | { | |
35149e21 | 1204 | kvm_release_pfn_clean(page_to_pfn(page)); |
b4231d61 IE |
1205 | } |
1206 | EXPORT_SYMBOL_GPL(kvm_release_page_clean); | |
1207 | ||
35149e21 AL |
1208 | void kvm_release_pfn_clean(pfn_t pfn) |
1209 | { | |
c77fb9dc | 1210 | if (!kvm_is_mmio_pfn(pfn)) |
2e2e3738 | 1211 | put_page(pfn_to_page(pfn)); |
35149e21 AL |
1212 | } |
1213 | EXPORT_SYMBOL_GPL(kvm_release_pfn_clean); | |
1214 | ||
b4231d61 | 1215 | void kvm_release_page_dirty(struct page *page) |
8a7ae055 | 1216 | { |
35149e21 AL |
1217 | kvm_release_pfn_dirty(page_to_pfn(page)); |
1218 | } | |
1219 | EXPORT_SYMBOL_GPL(kvm_release_page_dirty); | |
1220 | ||
1221 | void kvm_release_pfn_dirty(pfn_t pfn) | |
1222 | { | |
1223 | kvm_set_pfn_dirty(pfn); | |
1224 | kvm_release_pfn_clean(pfn); | |
1225 | } | |
1226 | EXPORT_SYMBOL_GPL(kvm_release_pfn_dirty); | |
1227 | ||
1228 | void kvm_set_page_dirty(struct page *page) | |
1229 | { | |
1230 | kvm_set_pfn_dirty(page_to_pfn(page)); | |
1231 | } | |
1232 | EXPORT_SYMBOL_GPL(kvm_set_page_dirty); | |
1233 | ||
1234 | void kvm_set_pfn_dirty(pfn_t pfn) | |
1235 | { | |
c77fb9dc | 1236 | if (!kvm_is_mmio_pfn(pfn)) { |
2e2e3738 AL |
1237 | struct page *page = pfn_to_page(pfn); |
1238 | if (!PageReserved(page)) | |
1239 | SetPageDirty(page); | |
1240 | } | |
8a7ae055 | 1241 | } |
35149e21 AL |
1242 | EXPORT_SYMBOL_GPL(kvm_set_pfn_dirty); |
1243 | ||
1244 | void kvm_set_pfn_accessed(pfn_t pfn) | |
1245 | { | |
c77fb9dc | 1246 | if (!kvm_is_mmio_pfn(pfn)) |
2e2e3738 | 1247 | mark_page_accessed(pfn_to_page(pfn)); |
35149e21 AL |
1248 | } |
1249 | EXPORT_SYMBOL_GPL(kvm_set_pfn_accessed); | |
1250 | ||
1251 | void kvm_get_pfn(pfn_t pfn) | |
1252 | { | |
c77fb9dc | 1253 | if (!kvm_is_mmio_pfn(pfn)) |
2e2e3738 | 1254 | get_page(pfn_to_page(pfn)); |
35149e21 AL |
1255 | } |
1256 | EXPORT_SYMBOL_GPL(kvm_get_pfn); | |
8a7ae055 | 1257 | |
195aefde IE |
1258 | static int next_segment(unsigned long len, int offset) |
1259 | { | |
1260 | if (len > PAGE_SIZE - offset) | |
1261 | return PAGE_SIZE - offset; | |
1262 | else | |
1263 | return len; | |
1264 | } | |
1265 | ||
1266 | int kvm_read_guest_page(struct kvm *kvm, gfn_t gfn, void *data, int offset, | |
1267 | int len) | |
1268 | { | |
e0506bcb IE |
1269 | int r; |
1270 | unsigned long addr; | |
195aefde | 1271 | |
e0506bcb IE |
1272 | addr = gfn_to_hva(kvm, gfn); |
1273 | if (kvm_is_error_hva(addr)) | |
1274 | return -EFAULT; | |
1275 | r = copy_from_user(data, (void __user *)addr + offset, len); | |
1276 | if (r) | |
195aefde | 1277 | return -EFAULT; |
195aefde IE |
1278 | return 0; |
1279 | } | |
1280 | EXPORT_SYMBOL_GPL(kvm_read_guest_page); | |
1281 | ||
1282 | int kvm_read_guest(struct kvm *kvm, gpa_t gpa, void *data, unsigned long len) | |
1283 | { | |
1284 | gfn_t gfn = gpa >> PAGE_SHIFT; | |
1285 | int seg; | |
1286 | int offset = offset_in_page(gpa); | |
1287 | int ret; | |
1288 | ||
1289 | while ((seg = next_segment(len, offset)) != 0) { | |
1290 | ret = kvm_read_guest_page(kvm, gfn, data, offset, seg); | |
1291 | if (ret < 0) | |
1292 | return ret; | |
1293 | offset = 0; | |
1294 | len -= seg; | |
1295 | data += seg; | |
1296 | ++gfn; | |
1297 | } | |
1298 | return 0; | |
1299 | } | |
1300 | EXPORT_SYMBOL_GPL(kvm_read_guest); | |
1301 | ||
7ec54588 MT |
1302 | int kvm_read_guest_atomic(struct kvm *kvm, gpa_t gpa, void *data, |
1303 | unsigned long len) | |
1304 | { | |
1305 | int r; | |
1306 | unsigned long addr; | |
1307 | gfn_t gfn = gpa >> PAGE_SHIFT; | |
1308 | int offset = offset_in_page(gpa); | |
1309 | ||
1310 | addr = gfn_to_hva(kvm, gfn); | |
1311 | if (kvm_is_error_hva(addr)) | |
1312 | return -EFAULT; | |
0aac03f0 | 1313 | pagefault_disable(); |
7ec54588 | 1314 | r = __copy_from_user_inatomic(data, (void __user *)addr + offset, len); |
0aac03f0 | 1315 | pagefault_enable(); |
7ec54588 MT |
1316 | if (r) |
1317 | return -EFAULT; | |
1318 | return 0; | |
1319 | } | |
1320 | EXPORT_SYMBOL(kvm_read_guest_atomic); | |
1321 | ||
195aefde IE |
1322 | int kvm_write_guest_page(struct kvm *kvm, gfn_t gfn, const void *data, |
1323 | int offset, int len) | |
1324 | { | |
e0506bcb IE |
1325 | int r; |
1326 | unsigned long addr; | |
195aefde | 1327 | |
e0506bcb IE |
1328 | addr = gfn_to_hva(kvm, gfn); |
1329 | if (kvm_is_error_hva(addr)) | |
1330 | return -EFAULT; | |
1331 | r = copy_to_user((void __user *)addr + offset, data, len); | |
1332 | if (r) | |
195aefde | 1333 | return -EFAULT; |
195aefde IE |
1334 | mark_page_dirty(kvm, gfn); |
1335 | return 0; | |
1336 | } | |
1337 | EXPORT_SYMBOL_GPL(kvm_write_guest_page); | |
1338 | ||
1339 | int kvm_write_guest(struct kvm *kvm, gpa_t gpa, const void *data, | |
1340 | unsigned long len) | |
1341 | { | |
1342 | gfn_t gfn = gpa >> PAGE_SHIFT; | |
1343 | int seg; | |
1344 | int offset = offset_in_page(gpa); | |
1345 | int ret; | |
1346 | ||
1347 | while ((seg = next_segment(len, offset)) != 0) { | |
1348 | ret = kvm_write_guest_page(kvm, gfn, data, offset, seg); | |
1349 | if (ret < 0) | |
1350 | return ret; | |
1351 | offset = 0; | |
1352 | len -= seg; | |
1353 | data += seg; | |
1354 | ++gfn; | |
1355 | } | |
1356 | return 0; | |
1357 | } | |
1358 | ||
49c7754c GN |
1359 | int kvm_gfn_to_hva_cache_init(struct kvm *kvm, struct gfn_to_hva_cache *ghc, |
1360 | gpa_t gpa) | |
1361 | { | |
1362 | struct kvm_memslots *slots = kvm_memslots(kvm); | |
1363 | int offset = offset_in_page(gpa); | |
1364 | gfn_t gfn = gpa >> PAGE_SHIFT; | |
1365 | ||
1366 | ghc->gpa = gpa; | |
1367 | ghc->generation = slots->generation; | |
1368 | ghc->memslot = __gfn_to_memslot(slots, gfn); | |
1369 | ghc->hva = gfn_to_hva_many(ghc->memslot, gfn, NULL); | |
1370 | if (!kvm_is_error_hva(ghc->hva)) | |
1371 | ghc->hva += offset; | |
1372 | else | |
1373 | return -EFAULT; | |
1374 | ||
1375 | return 0; | |
1376 | } | |
1377 | EXPORT_SYMBOL_GPL(kvm_gfn_to_hva_cache_init); | |
1378 | ||
1379 | int kvm_write_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc, | |
1380 | void *data, unsigned long len) | |
1381 | { | |
1382 | struct kvm_memslots *slots = kvm_memslots(kvm); | |
1383 | int r; | |
1384 | ||
1385 | if (slots->generation != ghc->generation) | |
1386 | kvm_gfn_to_hva_cache_init(kvm, ghc, ghc->gpa); | |
1387 | ||
1388 | if (kvm_is_error_hva(ghc->hva)) | |
1389 | return -EFAULT; | |
1390 | ||
1391 | r = copy_to_user((void __user *)ghc->hva, data, len); | |
1392 | if (r) | |
1393 | return -EFAULT; | |
1394 | mark_page_dirty_in_slot(kvm, ghc->memslot, ghc->gpa >> PAGE_SHIFT); | |
1395 | ||
1396 | return 0; | |
1397 | } | |
1398 | EXPORT_SYMBOL_GPL(kvm_write_guest_cached); | |
1399 | ||
195aefde IE |
1400 | int kvm_clear_guest_page(struct kvm *kvm, gfn_t gfn, int offset, int len) |
1401 | { | |
3bcc8a8c HC |
1402 | return kvm_write_guest_page(kvm, gfn, (const void *) empty_zero_page, |
1403 | offset, len); | |
195aefde IE |
1404 | } |
1405 | EXPORT_SYMBOL_GPL(kvm_clear_guest_page); | |
1406 | ||
1407 | int kvm_clear_guest(struct kvm *kvm, gpa_t gpa, unsigned long len) | |
1408 | { | |
1409 | gfn_t gfn = gpa >> PAGE_SHIFT; | |
1410 | int seg; | |
1411 | int offset = offset_in_page(gpa); | |
1412 | int ret; | |
1413 | ||
1414 | while ((seg = next_segment(len, offset)) != 0) { | |
1415 | ret = kvm_clear_guest_page(kvm, gfn, offset, seg); | |
1416 | if (ret < 0) | |
1417 | return ret; | |
1418 | offset = 0; | |
1419 | len -= seg; | |
1420 | ++gfn; | |
1421 | } | |
1422 | return 0; | |
1423 | } | |
1424 | EXPORT_SYMBOL_GPL(kvm_clear_guest); | |
1425 | ||
49c7754c GN |
1426 | void mark_page_dirty_in_slot(struct kvm *kvm, struct kvm_memory_slot *memslot, |
1427 | gfn_t gfn) | |
6aa8b732 | 1428 | { |
7e9d619d RR |
1429 | if (memslot && memslot->dirty_bitmap) { |
1430 | unsigned long rel_gfn = gfn - memslot->base_gfn; | |
6aa8b732 | 1431 | |
d1476937 | 1432 | generic___set_le_bit(rel_gfn, memslot->dirty_bitmap); |
6aa8b732 AK |
1433 | } |
1434 | } | |
1435 | ||
49c7754c GN |
1436 | void mark_page_dirty(struct kvm *kvm, gfn_t gfn) |
1437 | { | |
1438 | struct kvm_memory_slot *memslot; | |
1439 | ||
1440 | memslot = gfn_to_memslot(kvm, gfn); | |
1441 | mark_page_dirty_in_slot(kvm, memslot, gfn); | |
1442 | } | |
1443 | ||
b6958ce4 ED |
1444 | /* |
1445 | * The vCPU has executed a HLT instruction with in-kernel mode enabled. | |
1446 | */ | |
8776e519 | 1447 | void kvm_vcpu_block(struct kvm_vcpu *vcpu) |
d3bef15f | 1448 | { |
e5c239cf MT |
1449 | DEFINE_WAIT(wait); |
1450 | ||
1451 | for (;;) { | |
1452 | prepare_to_wait(&vcpu->wq, &wait, TASK_INTERRUPTIBLE); | |
1453 | ||
a1b37100 | 1454 | if (kvm_arch_vcpu_runnable(vcpu)) { |
a8eeb04a | 1455 | kvm_make_request(KVM_REQ_UNHALT, vcpu); |
e5c239cf | 1456 | break; |
d7690175 | 1457 | } |
09cec754 GN |
1458 | if (kvm_cpu_has_pending_timer(vcpu)) |
1459 | break; | |
e5c239cf MT |
1460 | if (signal_pending(current)) |
1461 | break; | |
1462 | ||
b6958ce4 | 1463 | schedule(); |
b6958ce4 | 1464 | } |
d3bef15f | 1465 | |
e5c239cf | 1466 | finish_wait(&vcpu->wq, &wait); |
b6958ce4 ED |
1467 | } |
1468 | ||
6aa8b732 AK |
1469 | void kvm_resched(struct kvm_vcpu *vcpu) |
1470 | { | |
3fca0365 YD |
1471 | if (!need_resched()) |
1472 | return; | |
6aa8b732 | 1473 | cond_resched(); |
6aa8b732 AK |
1474 | } |
1475 | EXPORT_SYMBOL_GPL(kvm_resched); | |
1476 | ||
d255f4f2 ZE |
1477 | void kvm_vcpu_on_spin(struct kvm_vcpu *vcpu) |
1478 | { | |
1479 | ktime_t expires; | |
1480 | DEFINE_WAIT(wait); | |
1481 | ||
1482 | prepare_to_wait(&vcpu->wq, &wait, TASK_INTERRUPTIBLE); | |
1483 | ||
1484 | /* Sleep for 100 us, and hope lock-holder got scheduled */ | |
1485 | expires = ktime_add_ns(ktime_get(), 100000UL); | |
1486 | schedule_hrtimeout(&expires, HRTIMER_MODE_ABS); | |
1487 | ||
1488 | finish_wait(&vcpu->wq, &wait); | |
1489 | } | |
1490 | EXPORT_SYMBOL_GPL(kvm_vcpu_on_spin); | |
1491 | ||
e4a533a4 | 1492 | static int kvm_vcpu_fault(struct vm_area_struct *vma, struct vm_fault *vmf) |
9a2bb7f4 AK |
1493 | { |
1494 | struct kvm_vcpu *vcpu = vma->vm_file->private_data; | |
9a2bb7f4 AK |
1495 | struct page *page; |
1496 | ||
e4a533a4 | 1497 | if (vmf->pgoff == 0) |
039576c0 | 1498 | page = virt_to_page(vcpu->run); |
09566765 | 1499 | #ifdef CONFIG_X86 |
e4a533a4 | 1500 | else if (vmf->pgoff == KVM_PIO_PAGE_OFFSET) |
ad312c7c | 1501 | page = virt_to_page(vcpu->arch.pio_data); |
5f94c174 LV |
1502 | #endif |
1503 | #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET | |
1504 | else if (vmf->pgoff == KVM_COALESCED_MMIO_PAGE_OFFSET) | |
1505 | page = virt_to_page(vcpu->kvm->coalesced_mmio_ring); | |
09566765 | 1506 | #endif |
039576c0 | 1507 | else |
e4a533a4 | 1508 | return VM_FAULT_SIGBUS; |
9a2bb7f4 | 1509 | get_page(page); |
e4a533a4 | 1510 | vmf->page = page; |
1511 | return 0; | |
9a2bb7f4 AK |
1512 | } |
1513 | ||
f0f37e2f | 1514 | static const struct vm_operations_struct kvm_vcpu_vm_ops = { |
e4a533a4 | 1515 | .fault = kvm_vcpu_fault, |
9a2bb7f4 AK |
1516 | }; |
1517 | ||
1518 | static int kvm_vcpu_mmap(struct file *file, struct vm_area_struct *vma) | |
1519 | { | |
1520 | vma->vm_ops = &kvm_vcpu_vm_ops; | |
1521 | return 0; | |
1522 | } | |
1523 | ||
bccf2150 AK |
1524 | static int kvm_vcpu_release(struct inode *inode, struct file *filp) |
1525 | { | |
1526 | struct kvm_vcpu *vcpu = filp->private_data; | |
1527 | ||
66c0b394 | 1528 | kvm_put_kvm(vcpu->kvm); |
bccf2150 AK |
1529 | return 0; |
1530 | } | |
1531 | ||
3d3aab1b | 1532 | static struct file_operations kvm_vcpu_fops = { |
bccf2150 AK |
1533 | .release = kvm_vcpu_release, |
1534 | .unlocked_ioctl = kvm_vcpu_ioctl, | |
1535 | .compat_ioctl = kvm_vcpu_ioctl, | |
9a2bb7f4 | 1536 | .mmap = kvm_vcpu_mmap, |
6038f373 | 1537 | .llseek = noop_llseek, |
bccf2150 AK |
1538 | }; |
1539 | ||
1540 | /* | |
1541 | * Allocates an inode for the vcpu. | |
1542 | */ | |
1543 | static int create_vcpu_fd(struct kvm_vcpu *vcpu) | |
1544 | { | |
628ff7c1 | 1545 | return anon_inode_getfd("kvm-vcpu", &kvm_vcpu_fops, vcpu, O_RDWR); |
bccf2150 AK |
1546 | } |
1547 | ||
c5ea7660 AK |
1548 | /* |
1549 | * Creates some virtual cpus. Good luck creating more than one. | |
1550 | */ | |
73880c80 | 1551 | static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, u32 id) |
c5ea7660 AK |
1552 | { |
1553 | int r; | |
988a2cae | 1554 | struct kvm_vcpu *vcpu, *v; |
c5ea7660 | 1555 | |
73880c80 | 1556 | vcpu = kvm_arch_vcpu_create(kvm, id); |
fb3f0f51 RR |
1557 | if (IS_ERR(vcpu)) |
1558 | return PTR_ERR(vcpu); | |
c5ea7660 | 1559 | |
15ad7146 AK |
1560 | preempt_notifier_init(&vcpu->preempt_notifier, &kvm_preempt_ops); |
1561 | ||
26e5215f AK |
1562 | r = kvm_arch_vcpu_setup(vcpu); |
1563 | if (r) | |
7d8fece6 | 1564 | return r; |
26e5215f | 1565 | |
11ec2804 | 1566 | mutex_lock(&kvm->lock); |
73880c80 GN |
1567 | if (atomic_read(&kvm->online_vcpus) == KVM_MAX_VCPUS) { |
1568 | r = -EINVAL; | |
e9b11c17 | 1569 | goto vcpu_destroy; |
fb3f0f51 | 1570 | } |
73880c80 | 1571 | |
988a2cae GN |
1572 | kvm_for_each_vcpu(r, v, kvm) |
1573 | if (v->vcpu_id == id) { | |
73880c80 GN |
1574 | r = -EEXIST; |
1575 | goto vcpu_destroy; | |
1576 | } | |
1577 | ||
1578 | BUG_ON(kvm->vcpus[atomic_read(&kvm->online_vcpus)]); | |
c5ea7660 | 1579 | |
fb3f0f51 | 1580 | /* Now it's all set up, let userspace reach it */ |
66c0b394 | 1581 | kvm_get_kvm(kvm); |
bccf2150 | 1582 | r = create_vcpu_fd(vcpu); |
73880c80 GN |
1583 | if (r < 0) { |
1584 | kvm_put_kvm(kvm); | |
1585 | goto vcpu_destroy; | |
1586 | } | |
1587 | ||
1588 | kvm->vcpus[atomic_read(&kvm->online_vcpus)] = vcpu; | |
1589 | smp_wmb(); | |
1590 | atomic_inc(&kvm->online_vcpus); | |
1591 | ||
1592 | #ifdef CONFIG_KVM_APIC_ARCHITECTURE | |
1593 | if (kvm->bsp_vcpu_id == id) | |
1594 | kvm->bsp_vcpu = vcpu; | |
1595 | #endif | |
1596 | mutex_unlock(&kvm->lock); | |
fb3f0f51 | 1597 | return r; |
39c3b86e | 1598 | |
e9b11c17 | 1599 | vcpu_destroy: |
7d8fece6 | 1600 | mutex_unlock(&kvm->lock); |
d40ccc62 | 1601 | kvm_arch_vcpu_destroy(vcpu); |
c5ea7660 AK |
1602 | return r; |
1603 | } | |
1604 | ||
1961d276 AK |
1605 | static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu *vcpu, sigset_t *sigset) |
1606 | { | |
1607 | if (sigset) { | |
1608 | sigdelsetmask(sigset, sigmask(SIGKILL)|sigmask(SIGSTOP)); | |
1609 | vcpu->sigset_active = 1; | |
1610 | vcpu->sigset = *sigset; | |
1611 | } else | |
1612 | vcpu->sigset_active = 0; | |
1613 | return 0; | |
1614 | } | |
1615 | ||
bccf2150 AK |
1616 | static long kvm_vcpu_ioctl(struct file *filp, |
1617 | unsigned int ioctl, unsigned long arg) | |
6aa8b732 | 1618 | { |
bccf2150 | 1619 | struct kvm_vcpu *vcpu = filp->private_data; |
2f366987 | 1620 | void __user *argp = (void __user *)arg; |
313a3dc7 | 1621 | int r; |
fa3795a7 DH |
1622 | struct kvm_fpu *fpu = NULL; |
1623 | struct kvm_sregs *kvm_sregs = NULL; | |
6aa8b732 | 1624 | |
6d4e4c4f AK |
1625 | if (vcpu->kvm->mm != current->mm) |
1626 | return -EIO; | |
2122ff5e AK |
1627 | |
1628 | #if defined(CONFIG_S390) || defined(CONFIG_PPC) | |
1629 | /* | |
1630 | * Special cases: vcpu ioctls that are asynchronous to vcpu execution, | |
1631 | * so vcpu_load() would break it. | |
1632 | */ | |
1633 | if (ioctl == KVM_S390_INTERRUPT || ioctl == KVM_INTERRUPT) | |
1634 | return kvm_arch_vcpu_ioctl(filp, ioctl, arg); | |
1635 | #endif | |
1636 | ||
1637 | ||
1638 | vcpu_load(vcpu); | |
6aa8b732 | 1639 | switch (ioctl) { |
9a2bb7f4 | 1640 | case KVM_RUN: |
f0fe5108 AK |
1641 | r = -EINVAL; |
1642 | if (arg) | |
1643 | goto out; | |
b6c7a5dc | 1644 | r = kvm_arch_vcpu_ioctl_run(vcpu, vcpu->run); |
64be5007 | 1645 | trace_kvm_userspace_exit(vcpu->run->exit_reason, r); |
6aa8b732 | 1646 | break; |
6aa8b732 | 1647 | case KVM_GET_REGS: { |
3e4bb3ac | 1648 | struct kvm_regs *kvm_regs; |
6aa8b732 | 1649 | |
3e4bb3ac XZ |
1650 | r = -ENOMEM; |
1651 | kvm_regs = kzalloc(sizeof(struct kvm_regs), GFP_KERNEL); | |
1652 | if (!kvm_regs) | |
6aa8b732 | 1653 | goto out; |
3e4bb3ac XZ |
1654 | r = kvm_arch_vcpu_ioctl_get_regs(vcpu, kvm_regs); |
1655 | if (r) | |
1656 | goto out_free1; | |
6aa8b732 | 1657 | r = -EFAULT; |
3e4bb3ac XZ |
1658 | if (copy_to_user(argp, kvm_regs, sizeof(struct kvm_regs))) |
1659 | goto out_free1; | |
6aa8b732 | 1660 | r = 0; |
3e4bb3ac XZ |
1661 | out_free1: |
1662 | kfree(kvm_regs); | |
6aa8b732 AK |
1663 | break; |
1664 | } | |
1665 | case KVM_SET_REGS: { | |
3e4bb3ac | 1666 | struct kvm_regs *kvm_regs; |
6aa8b732 | 1667 | |
3e4bb3ac XZ |
1668 | r = -ENOMEM; |
1669 | kvm_regs = kzalloc(sizeof(struct kvm_regs), GFP_KERNEL); | |
1670 | if (!kvm_regs) | |
6aa8b732 | 1671 | goto out; |
3e4bb3ac XZ |
1672 | r = -EFAULT; |
1673 | if (copy_from_user(kvm_regs, argp, sizeof(struct kvm_regs))) | |
1674 | goto out_free2; | |
1675 | r = kvm_arch_vcpu_ioctl_set_regs(vcpu, kvm_regs); | |
6aa8b732 | 1676 | if (r) |
3e4bb3ac | 1677 | goto out_free2; |
6aa8b732 | 1678 | r = 0; |
3e4bb3ac XZ |
1679 | out_free2: |
1680 | kfree(kvm_regs); | |
6aa8b732 AK |
1681 | break; |
1682 | } | |
1683 | case KVM_GET_SREGS: { | |
fa3795a7 DH |
1684 | kvm_sregs = kzalloc(sizeof(struct kvm_sregs), GFP_KERNEL); |
1685 | r = -ENOMEM; | |
1686 | if (!kvm_sregs) | |
1687 | goto out; | |
1688 | r = kvm_arch_vcpu_ioctl_get_sregs(vcpu, kvm_sregs); | |
6aa8b732 AK |
1689 | if (r) |
1690 | goto out; | |
1691 | r = -EFAULT; | |
fa3795a7 | 1692 | if (copy_to_user(argp, kvm_sregs, sizeof(struct kvm_sregs))) |
6aa8b732 AK |
1693 | goto out; |
1694 | r = 0; | |
1695 | break; | |
1696 | } | |
1697 | case KVM_SET_SREGS: { | |
fa3795a7 DH |
1698 | kvm_sregs = kmalloc(sizeof(struct kvm_sregs), GFP_KERNEL); |
1699 | r = -ENOMEM; | |
1700 | if (!kvm_sregs) | |
1701 | goto out; | |
6aa8b732 | 1702 | r = -EFAULT; |
fa3795a7 | 1703 | if (copy_from_user(kvm_sregs, argp, sizeof(struct kvm_sregs))) |
6aa8b732 | 1704 | goto out; |
fa3795a7 | 1705 | r = kvm_arch_vcpu_ioctl_set_sregs(vcpu, kvm_sregs); |
6aa8b732 AK |
1706 | if (r) |
1707 | goto out; | |
1708 | r = 0; | |
1709 | break; | |
1710 | } | |
62d9f0db MT |
1711 | case KVM_GET_MP_STATE: { |
1712 | struct kvm_mp_state mp_state; | |
1713 | ||
1714 | r = kvm_arch_vcpu_ioctl_get_mpstate(vcpu, &mp_state); | |
1715 | if (r) | |
1716 | goto out; | |
1717 | r = -EFAULT; | |
1718 | if (copy_to_user(argp, &mp_state, sizeof mp_state)) | |
1719 | goto out; | |
1720 | r = 0; | |
1721 | break; | |
1722 | } | |
1723 | case KVM_SET_MP_STATE: { | |
1724 | struct kvm_mp_state mp_state; | |
1725 | ||
1726 | r = -EFAULT; | |
1727 | if (copy_from_user(&mp_state, argp, sizeof mp_state)) | |
1728 | goto out; | |
1729 | r = kvm_arch_vcpu_ioctl_set_mpstate(vcpu, &mp_state); | |
1730 | if (r) | |
1731 | goto out; | |
1732 | r = 0; | |
1733 | break; | |
1734 | } | |
6aa8b732 AK |
1735 | case KVM_TRANSLATE: { |
1736 | struct kvm_translation tr; | |
1737 | ||
1738 | r = -EFAULT; | |
2f366987 | 1739 | if (copy_from_user(&tr, argp, sizeof tr)) |
6aa8b732 | 1740 | goto out; |
8b006791 | 1741 | r = kvm_arch_vcpu_ioctl_translate(vcpu, &tr); |
6aa8b732 AK |
1742 | if (r) |
1743 | goto out; | |
1744 | r = -EFAULT; | |
2f366987 | 1745 | if (copy_to_user(argp, &tr, sizeof tr)) |
6aa8b732 AK |
1746 | goto out; |
1747 | r = 0; | |
1748 | break; | |
1749 | } | |
d0bfb940 JK |
1750 | case KVM_SET_GUEST_DEBUG: { |
1751 | struct kvm_guest_debug dbg; | |
6aa8b732 AK |
1752 | |
1753 | r = -EFAULT; | |
2f366987 | 1754 | if (copy_from_user(&dbg, argp, sizeof dbg)) |
6aa8b732 | 1755 | goto out; |
d0bfb940 | 1756 | r = kvm_arch_vcpu_ioctl_set_guest_debug(vcpu, &dbg); |
6aa8b732 AK |
1757 | if (r) |
1758 | goto out; | |
1759 | r = 0; | |
1760 | break; | |
1761 | } | |
1961d276 AK |
1762 | case KVM_SET_SIGNAL_MASK: { |
1763 | struct kvm_signal_mask __user *sigmask_arg = argp; | |
1764 | struct kvm_signal_mask kvm_sigmask; | |
1765 | sigset_t sigset, *p; | |
1766 | ||
1767 | p = NULL; | |
1768 | if (argp) { | |
1769 | r = -EFAULT; | |
1770 | if (copy_from_user(&kvm_sigmask, argp, | |
1771 | sizeof kvm_sigmask)) | |
1772 | goto out; | |
1773 | r = -EINVAL; | |
1774 | if (kvm_sigmask.len != sizeof sigset) | |
1775 | goto out; | |
1776 | r = -EFAULT; | |
1777 | if (copy_from_user(&sigset, sigmask_arg->sigset, | |
1778 | sizeof sigset)) | |
1779 | goto out; | |
1780 | p = &sigset; | |
1781 | } | |
376d41ff | 1782 | r = kvm_vcpu_ioctl_set_sigmask(vcpu, p); |
1961d276 AK |
1783 | break; |
1784 | } | |
b8836737 | 1785 | case KVM_GET_FPU: { |
fa3795a7 DH |
1786 | fpu = kzalloc(sizeof(struct kvm_fpu), GFP_KERNEL); |
1787 | r = -ENOMEM; | |
1788 | if (!fpu) | |
1789 | goto out; | |
1790 | r = kvm_arch_vcpu_ioctl_get_fpu(vcpu, fpu); | |
b8836737 AK |
1791 | if (r) |
1792 | goto out; | |
1793 | r = -EFAULT; | |
fa3795a7 | 1794 | if (copy_to_user(argp, fpu, sizeof(struct kvm_fpu))) |
b8836737 AK |
1795 | goto out; |
1796 | r = 0; | |
1797 | break; | |
1798 | } | |
1799 | case KVM_SET_FPU: { | |
fa3795a7 DH |
1800 | fpu = kmalloc(sizeof(struct kvm_fpu), GFP_KERNEL); |
1801 | r = -ENOMEM; | |
1802 | if (!fpu) | |
1803 | goto out; | |
b8836737 | 1804 | r = -EFAULT; |
fa3795a7 | 1805 | if (copy_from_user(fpu, argp, sizeof(struct kvm_fpu))) |
b8836737 | 1806 | goto out; |
fa3795a7 | 1807 | r = kvm_arch_vcpu_ioctl_set_fpu(vcpu, fpu); |
b8836737 AK |
1808 | if (r) |
1809 | goto out; | |
1810 | r = 0; | |
1811 | break; | |
1812 | } | |
bccf2150 | 1813 | default: |
313a3dc7 | 1814 | r = kvm_arch_vcpu_ioctl(filp, ioctl, arg); |
bccf2150 AK |
1815 | } |
1816 | out: | |
2122ff5e | 1817 | vcpu_put(vcpu); |
fa3795a7 DH |
1818 | kfree(fpu); |
1819 | kfree(kvm_sregs); | |
bccf2150 AK |
1820 | return r; |
1821 | } | |
1822 | ||
1823 | static long kvm_vm_ioctl(struct file *filp, | |
1824 | unsigned int ioctl, unsigned long arg) | |
1825 | { | |
1826 | struct kvm *kvm = filp->private_data; | |
1827 | void __user *argp = (void __user *)arg; | |
1fe779f8 | 1828 | int r; |
bccf2150 | 1829 | |
6d4e4c4f AK |
1830 | if (kvm->mm != current->mm) |
1831 | return -EIO; | |
bccf2150 AK |
1832 | switch (ioctl) { |
1833 | case KVM_CREATE_VCPU: | |
1834 | r = kvm_vm_ioctl_create_vcpu(kvm, arg); | |
1835 | if (r < 0) | |
1836 | goto out; | |
1837 | break; | |
6fc138d2 IE |
1838 | case KVM_SET_USER_MEMORY_REGION: { |
1839 | struct kvm_userspace_memory_region kvm_userspace_mem; | |
1840 | ||
1841 | r = -EFAULT; | |
1842 | if (copy_from_user(&kvm_userspace_mem, argp, | |
1843 | sizeof kvm_userspace_mem)) | |
1844 | goto out; | |
1845 | ||
1846 | r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_userspace_mem, 1); | |
6aa8b732 AK |
1847 | if (r) |
1848 | goto out; | |
1849 | break; | |
1850 | } | |
1851 | case KVM_GET_DIRTY_LOG: { | |
1852 | struct kvm_dirty_log log; | |
1853 | ||
1854 | r = -EFAULT; | |
2f366987 | 1855 | if (copy_from_user(&log, argp, sizeof log)) |
6aa8b732 | 1856 | goto out; |
2c6f5df9 | 1857 | r = kvm_vm_ioctl_get_dirty_log(kvm, &log); |
6aa8b732 AK |
1858 | if (r) |
1859 | goto out; | |
1860 | break; | |
1861 | } | |
5f94c174 LV |
1862 | #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET |
1863 | case KVM_REGISTER_COALESCED_MMIO: { | |
1864 | struct kvm_coalesced_mmio_zone zone; | |
1865 | r = -EFAULT; | |
1866 | if (copy_from_user(&zone, argp, sizeof zone)) | |
1867 | goto out; | |
5f94c174 LV |
1868 | r = kvm_vm_ioctl_register_coalesced_mmio(kvm, &zone); |
1869 | if (r) | |
1870 | goto out; | |
1871 | r = 0; | |
1872 | break; | |
1873 | } | |
1874 | case KVM_UNREGISTER_COALESCED_MMIO: { | |
1875 | struct kvm_coalesced_mmio_zone zone; | |
1876 | r = -EFAULT; | |
1877 | if (copy_from_user(&zone, argp, sizeof zone)) | |
1878 | goto out; | |
5f94c174 LV |
1879 | r = kvm_vm_ioctl_unregister_coalesced_mmio(kvm, &zone); |
1880 | if (r) | |
1881 | goto out; | |
1882 | r = 0; | |
1883 | break; | |
1884 | } | |
1885 | #endif | |
721eecbf GH |
1886 | case KVM_IRQFD: { |
1887 | struct kvm_irqfd data; | |
1888 | ||
1889 | r = -EFAULT; | |
1890 | if (copy_from_user(&data, argp, sizeof data)) | |
1891 | goto out; | |
1892 | r = kvm_irqfd(kvm, data.fd, data.gsi, data.flags); | |
1893 | break; | |
1894 | } | |
d34e6b17 GH |
1895 | case KVM_IOEVENTFD: { |
1896 | struct kvm_ioeventfd data; | |
1897 | ||
1898 | r = -EFAULT; | |
1899 | if (copy_from_user(&data, argp, sizeof data)) | |
1900 | goto out; | |
1901 | r = kvm_ioeventfd(kvm, &data); | |
1902 | break; | |
1903 | } | |
73880c80 GN |
1904 | #ifdef CONFIG_KVM_APIC_ARCHITECTURE |
1905 | case KVM_SET_BOOT_CPU_ID: | |
1906 | r = 0; | |
894a9c55 | 1907 | mutex_lock(&kvm->lock); |
73880c80 GN |
1908 | if (atomic_read(&kvm->online_vcpus) != 0) |
1909 | r = -EBUSY; | |
1910 | else | |
1911 | kvm->bsp_vcpu_id = arg; | |
894a9c55 | 1912 | mutex_unlock(&kvm->lock); |
73880c80 GN |
1913 | break; |
1914 | #endif | |
f17abe9a | 1915 | default: |
1fe779f8 | 1916 | r = kvm_arch_vm_ioctl(filp, ioctl, arg); |
bfd99ff5 AK |
1917 | if (r == -ENOTTY) |
1918 | r = kvm_vm_ioctl_assigned_device(kvm, ioctl, arg); | |
f17abe9a AK |
1919 | } |
1920 | out: | |
1921 | return r; | |
1922 | } | |
1923 | ||
6ff5894c AB |
1924 | #ifdef CONFIG_COMPAT |
1925 | struct compat_kvm_dirty_log { | |
1926 | __u32 slot; | |
1927 | __u32 padding1; | |
1928 | union { | |
1929 | compat_uptr_t dirty_bitmap; /* one bit per page */ | |
1930 | __u64 padding2; | |
1931 | }; | |
1932 | }; | |
1933 | ||
1934 | static long kvm_vm_compat_ioctl(struct file *filp, | |
1935 | unsigned int ioctl, unsigned long arg) | |
1936 | { | |
1937 | struct kvm *kvm = filp->private_data; | |
1938 | int r; | |
1939 | ||
1940 | if (kvm->mm != current->mm) | |
1941 | return -EIO; | |
1942 | switch (ioctl) { | |
1943 | case KVM_GET_DIRTY_LOG: { | |
1944 | struct compat_kvm_dirty_log compat_log; | |
1945 | struct kvm_dirty_log log; | |
1946 | ||
1947 | r = -EFAULT; | |
1948 | if (copy_from_user(&compat_log, (void __user *)arg, | |
1949 | sizeof(compat_log))) | |
1950 | goto out; | |
1951 | log.slot = compat_log.slot; | |
1952 | log.padding1 = compat_log.padding1; | |
1953 | log.padding2 = compat_log.padding2; | |
1954 | log.dirty_bitmap = compat_ptr(compat_log.dirty_bitmap); | |
1955 | ||
1956 | r = kvm_vm_ioctl_get_dirty_log(kvm, &log); | |
1957 | if (r) | |
1958 | goto out; | |
1959 | break; | |
1960 | } | |
1961 | default: | |
1962 | r = kvm_vm_ioctl(filp, ioctl, arg); | |
1963 | } | |
1964 | ||
1965 | out: | |
1966 | return r; | |
1967 | } | |
1968 | #endif | |
1969 | ||
e4a533a4 | 1970 | static int kvm_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf) |
f17abe9a | 1971 | { |
777b3f49 MT |
1972 | struct page *page[1]; |
1973 | unsigned long addr; | |
1974 | int npages; | |
1975 | gfn_t gfn = vmf->pgoff; | |
f17abe9a | 1976 | struct kvm *kvm = vma->vm_file->private_data; |
f17abe9a | 1977 | |
777b3f49 MT |
1978 | addr = gfn_to_hva(kvm, gfn); |
1979 | if (kvm_is_error_hva(addr)) | |
e4a533a4 | 1980 | return VM_FAULT_SIGBUS; |
777b3f49 MT |
1981 | |
1982 | npages = get_user_pages(current, current->mm, addr, 1, 1, 0, page, | |
1983 | NULL); | |
1984 | if (unlikely(npages != 1)) | |
e4a533a4 | 1985 | return VM_FAULT_SIGBUS; |
777b3f49 MT |
1986 | |
1987 | vmf->page = page[0]; | |
e4a533a4 | 1988 | return 0; |
f17abe9a AK |
1989 | } |
1990 | ||
f0f37e2f | 1991 | static const struct vm_operations_struct kvm_vm_vm_ops = { |
e4a533a4 | 1992 | .fault = kvm_vm_fault, |
f17abe9a AK |
1993 | }; |
1994 | ||
1995 | static int kvm_vm_mmap(struct file *file, struct vm_area_struct *vma) | |
1996 | { | |
1997 | vma->vm_ops = &kvm_vm_vm_ops; | |
1998 | return 0; | |
1999 | } | |
2000 | ||
3d3aab1b | 2001 | static struct file_operations kvm_vm_fops = { |
f17abe9a AK |
2002 | .release = kvm_vm_release, |
2003 | .unlocked_ioctl = kvm_vm_ioctl, | |
6ff5894c AB |
2004 | #ifdef CONFIG_COMPAT |
2005 | .compat_ioctl = kvm_vm_compat_ioctl, | |
2006 | #endif | |
f17abe9a | 2007 | .mmap = kvm_vm_mmap, |
6038f373 | 2008 | .llseek = noop_llseek, |
f17abe9a AK |
2009 | }; |
2010 | ||
2011 | static int kvm_dev_ioctl_create_vm(void) | |
2012 | { | |
aac87636 | 2013 | int r; |
f17abe9a AK |
2014 | struct kvm *kvm; |
2015 | ||
f17abe9a | 2016 | kvm = kvm_create_vm(); |
d6d28168 AK |
2017 | if (IS_ERR(kvm)) |
2018 | return PTR_ERR(kvm); | |
6ce5a090 TY |
2019 | #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET |
2020 | r = kvm_coalesced_mmio_init(kvm); | |
2021 | if (r < 0) { | |
2022 | kvm_put_kvm(kvm); | |
2023 | return r; | |
2024 | } | |
2025 | #endif | |
aac87636 HC |
2026 | r = anon_inode_getfd("kvm-vm", &kvm_vm_fops, kvm, O_RDWR); |
2027 | if (r < 0) | |
66c0b394 | 2028 | kvm_put_kvm(kvm); |
f17abe9a | 2029 | |
aac87636 | 2030 | return r; |
f17abe9a AK |
2031 | } |
2032 | ||
1a811b61 AK |
2033 | static long kvm_dev_ioctl_check_extension_generic(long arg) |
2034 | { | |
2035 | switch (arg) { | |
ca9edaee | 2036 | case KVM_CAP_USER_MEMORY: |
1a811b61 | 2037 | case KVM_CAP_DESTROY_MEMORY_REGION_WORKS: |
4cd481f6 | 2038 | case KVM_CAP_JOIN_MEMORY_REGIONS_WORKS: |
73880c80 GN |
2039 | #ifdef CONFIG_KVM_APIC_ARCHITECTURE |
2040 | case KVM_CAP_SET_BOOT_CPU_ID: | |
2041 | #endif | |
a9c7399d | 2042 | case KVM_CAP_INTERNAL_ERROR_DATA: |
1a811b61 | 2043 | return 1; |
399ec807 AK |
2044 | #ifdef CONFIG_HAVE_KVM_IRQCHIP |
2045 | case KVM_CAP_IRQ_ROUTING: | |
36463146 | 2046 | return KVM_MAX_IRQ_ROUTES; |
399ec807 | 2047 | #endif |
1a811b61 AK |
2048 | default: |
2049 | break; | |
2050 | } | |
2051 | return kvm_dev_ioctl_check_extension(arg); | |
2052 | } | |
2053 | ||
f17abe9a AK |
2054 | static long kvm_dev_ioctl(struct file *filp, |
2055 | unsigned int ioctl, unsigned long arg) | |
2056 | { | |
07c45a36 | 2057 | long r = -EINVAL; |
f17abe9a AK |
2058 | |
2059 | switch (ioctl) { | |
2060 | case KVM_GET_API_VERSION: | |
f0fe5108 AK |
2061 | r = -EINVAL; |
2062 | if (arg) | |
2063 | goto out; | |
f17abe9a AK |
2064 | r = KVM_API_VERSION; |
2065 | break; | |
2066 | case KVM_CREATE_VM: | |
f0fe5108 AK |
2067 | r = -EINVAL; |
2068 | if (arg) | |
2069 | goto out; | |
f17abe9a AK |
2070 | r = kvm_dev_ioctl_create_vm(); |
2071 | break; | |
018d00d2 | 2072 | case KVM_CHECK_EXTENSION: |
1a811b61 | 2073 | r = kvm_dev_ioctl_check_extension_generic(arg); |
5d308f45 | 2074 | break; |
07c45a36 AK |
2075 | case KVM_GET_VCPU_MMAP_SIZE: |
2076 | r = -EINVAL; | |
2077 | if (arg) | |
2078 | goto out; | |
adb1ff46 AK |
2079 | r = PAGE_SIZE; /* struct kvm_run */ |
2080 | #ifdef CONFIG_X86 | |
2081 | r += PAGE_SIZE; /* pio data page */ | |
5f94c174 LV |
2082 | #endif |
2083 | #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET | |
2084 | r += PAGE_SIZE; /* coalesced mmio ring page */ | |
adb1ff46 | 2085 | #endif |
07c45a36 | 2086 | break; |
d4c9ff2d FEL |
2087 | case KVM_TRACE_ENABLE: |
2088 | case KVM_TRACE_PAUSE: | |
2089 | case KVM_TRACE_DISABLE: | |
2023a29c | 2090 | r = -EOPNOTSUPP; |
d4c9ff2d | 2091 | break; |
6aa8b732 | 2092 | default: |
043405e1 | 2093 | return kvm_arch_dev_ioctl(filp, ioctl, arg); |
6aa8b732 AK |
2094 | } |
2095 | out: | |
2096 | return r; | |
2097 | } | |
2098 | ||
6aa8b732 | 2099 | static struct file_operations kvm_chardev_ops = { |
6aa8b732 AK |
2100 | .unlocked_ioctl = kvm_dev_ioctl, |
2101 | .compat_ioctl = kvm_dev_ioctl, | |
6038f373 | 2102 | .llseek = noop_llseek, |
6aa8b732 AK |
2103 | }; |
2104 | ||
2105 | static struct miscdevice kvm_dev = { | |
bbe4432e | 2106 | KVM_MINOR, |
6aa8b732 AK |
2107 | "kvm", |
2108 | &kvm_chardev_ops, | |
2109 | }; | |
2110 | ||
75b7127c | 2111 | static void hardware_enable_nolock(void *junk) |
1b6c0168 AK |
2112 | { |
2113 | int cpu = raw_smp_processor_id(); | |
10474ae8 | 2114 | int r; |
1b6c0168 | 2115 | |
7f59f492 | 2116 | if (cpumask_test_cpu(cpu, cpus_hardware_enabled)) |
1b6c0168 | 2117 | return; |
10474ae8 | 2118 | |
7f59f492 | 2119 | cpumask_set_cpu(cpu, cpus_hardware_enabled); |
10474ae8 AG |
2120 | |
2121 | r = kvm_arch_hardware_enable(NULL); | |
2122 | ||
2123 | if (r) { | |
2124 | cpumask_clear_cpu(cpu, cpus_hardware_enabled); | |
2125 | atomic_inc(&hardware_enable_failed); | |
2126 | printk(KERN_INFO "kvm: enabling virtualization on " | |
2127 | "CPU%d failed\n", cpu); | |
2128 | } | |
1b6c0168 AK |
2129 | } |
2130 | ||
75b7127c TY |
2131 | static void hardware_enable(void *junk) |
2132 | { | |
2133 | spin_lock(&kvm_lock); | |
2134 | hardware_enable_nolock(junk); | |
2135 | spin_unlock(&kvm_lock); | |
2136 | } | |
2137 | ||
2138 | static void hardware_disable_nolock(void *junk) | |
1b6c0168 AK |
2139 | { |
2140 | int cpu = raw_smp_processor_id(); | |
2141 | ||
7f59f492 | 2142 | if (!cpumask_test_cpu(cpu, cpus_hardware_enabled)) |
1b6c0168 | 2143 | return; |
7f59f492 | 2144 | cpumask_clear_cpu(cpu, cpus_hardware_enabled); |
e9b11c17 | 2145 | kvm_arch_hardware_disable(NULL); |
1b6c0168 AK |
2146 | } |
2147 | ||
75b7127c TY |
2148 | static void hardware_disable(void *junk) |
2149 | { | |
2150 | spin_lock(&kvm_lock); | |
2151 | hardware_disable_nolock(junk); | |
2152 | spin_unlock(&kvm_lock); | |
2153 | } | |
2154 | ||
10474ae8 AG |
2155 | static void hardware_disable_all_nolock(void) |
2156 | { | |
2157 | BUG_ON(!kvm_usage_count); | |
2158 | ||
2159 | kvm_usage_count--; | |
2160 | if (!kvm_usage_count) | |
75b7127c | 2161 | on_each_cpu(hardware_disable_nolock, NULL, 1); |
10474ae8 AG |
2162 | } |
2163 | ||
2164 | static void hardware_disable_all(void) | |
2165 | { | |
2166 | spin_lock(&kvm_lock); | |
2167 | hardware_disable_all_nolock(); | |
2168 | spin_unlock(&kvm_lock); | |
2169 | } | |
2170 | ||
2171 | static int hardware_enable_all(void) | |
2172 | { | |
2173 | int r = 0; | |
2174 | ||
2175 | spin_lock(&kvm_lock); | |
2176 | ||
2177 | kvm_usage_count++; | |
2178 | if (kvm_usage_count == 1) { | |
2179 | atomic_set(&hardware_enable_failed, 0); | |
75b7127c | 2180 | on_each_cpu(hardware_enable_nolock, NULL, 1); |
10474ae8 AG |
2181 | |
2182 | if (atomic_read(&hardware_enable_failed)) { | |
2183 | hardware_disable_all_nolock(); | |
2184 | r = -EBUSY; | |
2185 | } | |
2186 | } | |
2187 | ||
2188 | spin_unlock(&kvm_lock); | |
2189 | ||
2190 | return r; | |
2191 | } | |
2192 | ||
774c47f1 AK |
2193 | static int kvm_cpu_hotplug(struct notifier_block *notifier, unsigned long val, |
2194 | void *v) | |
2195 | { | |
2196 | int cpu = (long)v; | |
2197 | ||
10474ae8 AG |
2198 | if (!kvm_usage_count) |
2199 | return NOTIFY_OK; | |
2200 | ||
1a6f4d7f | 2201 | val &= ~CPU_TASKS_FROZEN; |
774c47f1 | 2202 | switch (val) { |
cec9ad27 | 2203 | case CPU_DYING: |
6ec8a856 AK |
2204 | printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n", |
2205 | cpu); | |
2206 | hardware_disable(NULL); | |
2207 | break; | |
da908f2f | 2208 | case CPU_STARTING: |
43934a38 JK |
2209 | printk(KERN_INFO "kvm: enabling virtualization on CPU%d\n", |
2210 | cpu); | |
da908f2f | 2211 | hardware_enable(NULL); |
774c47f1 AK |
2212 | break; |
2213 | } | |
2214 | return NOTIFY_OK; | |
2215 | } | |
2216 | ||
4ecac3fd | 2217 | |
b7c4145b | 2218 | asmlinkage void kvm_spurious_fault(void) |
4ecac3fd | 2219 | { |
4ecac3fd AK |
2220 | /* Fault while not rebooting. We want the trace. */ |
2221 | BUG(); | |
2222 | } | |
b7c4145b | 2223 | EXPORT_SYMBOL_GPL(kvm_spurious_fault); |
4ecac3fd | 2224 | |
9a2b85c6 | 2225 | static int kvm_reboot(struct notifier_block *notifier, unsigned long val, |
d77c26fc | 2226 | void *v) |
9a2b85c6 | 2227 | { |
8e1c1815 SY |
2228 | /* |
2229 | * Some (well, at least mine) BIOSes hang on reboot if | |
2230 | * in vmx root mode. | |
2231 | * | |
2232 | * And Intel TXT required VMX off for all cpu when system shutdown. | |
2233 | */ | |
2234 | printk(KERN_INFO "kvm: exiting hardware virtualization\n"); | |
2235 | kvm_rebooting = true; | |
75b7127c | 2236 | on_each_cpu(hardware_disable_nolock, NULL, 1); |
9a2b85c6 RR |
2237 | return NOTIFY_OK; |
2238 | } | |
2239 | ||
2240 | static struct notifier_block kvm_reboot_notifier = { | |
2241 | .notifier_call = kvm_reboot, | |
2242 | .priority = 0, | |
2243 | }; | |
2244 | ||
e93f8a0f | 2245 | static void kvm_io_bus_destroy(struct kvm_io_bus *bus) |
2eeb2e94 GH |
2246 | { |
2247 | int i; | |
2248 | ||
2249 | for (i = 0; i < bus->dev_count; i++) { | |
2250 | struct kvm_io_device *pos = bus->devs[i]; | |
2251 | ||
2252 | kvm_iodevice_destructor(pos); | |
2253 | } | |
e93f8a0f | 2254 | kfree(bus); |
2eeb2e94 GH |
2255 | } |
2256 | ||
bda9020e | 2257 | /* kvm_io_bus_write - called under kvm->slots_lock */ |
e93f8a0f | 2258 | int kvm_io_bus_write(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr, |
bda9020e | 2259 | int len, const void *val) |
2eeb2e94 GH |
2260 | { |
2261 | int i; | |
90d83dc3 LJ |
2262 | struct kvm_io_bus *bus; |
2263 | ||
2264 | bus = srcu_dereference(kvm->buses[bus_idx], &kvm->srcu); | |
bda9020e MT |
2265 | for (i = 0; i < bus->dev_count; i++) |
2266 | if (!kvm_iodevice_write(bus->devs[i], addr, len, val)) | |
2267 | return 0; | |
2268 | return -EOPNOTSUPP; | |
2269 | } | |
2eeb2e94 | 2270 | |
bda9020e | 2271 | /* kvm_io_bus_read - called under kvm->slots_lock */ |
e93f8a0f MT |
2272 | int kvm_io_bus_read(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr, |
2273 | int len, void *val) | |
bda9020e MT |
2274 | { |
2275 | int i; | |
90d83dc3 | 2276 | struct kvm_io_bus *bus; |
e93f8a0f | 2277 | |
90d83dc3 | 2278 | bus = srcu_dereference(kvm->buses[bus_idx], &kvm->srcu); |
bda9020e MT |
2279 | for (i = 0; i < bus->dev_count; i++) |
2280 | if (!kvm_iodevice_read(bus->devs[i], addr, len, val)) | |
2281 | return 0; | |
2282 | return -EOPNOTSUPP; | |
2eeb2e94 GH |
2283 | } |
2284 | ||
79fac95e | 2285 | /* Caller must hold slots_lock. */ |
e93f8a0f MT |
2286 | int kvm_io_bus_register_dev(struct kvm *kvm, enum kvm_bus bus_idx, |
2287 | struct kvm_io_device *dev) | |
6c474694 | 2288 | { |
e93f8a0f | 2289 | struct kvm_io_bus *new_bus, *bus; |
090b7aff | 2290 | |
e93f8a0f | 2291 | bus = kvm->buses[bus_idx]; |
090b7aff GH |
2292 | if (bus->dev_count > NR_IOBUS_DEVS-1) |
2293 | return -ENOSPC; | |
2eeb2e94 | 2294 | |
e93f8a0f MT |
2295 | new_bus = kzalloc(sizeof(struct kvm_io_bus), GFP_KERNEL); |
2296 | if (!new_bus) | |
2297 | return -ENOMEM; | |
2298 | memcpy(new_bus, bus, sizeof(struct kvm_io_bus)); | |
2299 | new_bus->devs[new_bus->dev_count++] = dev; | |
2300 | rcu_assign_pointer(kvm->buses[bus_idx], new_bus); | |
2301 | synchronize_srcu_expedited(&kvm->srcu); | |
2302 | kfree(bus); | |
090b7aff GH |
2303 | |
2304 | return 0; | |
2305 | } | |
2306 | ||
79fac95e | 2307 | /* Caller must hold slots_lock. */ |
e93f8a0f MT |
2308 | int kvm_io_bus_unregister_dev(struct kvm *kvm, enum kvm_bus bus_idx, |
2309 | struct kvm_io_device *dev) | |
090b7aff | 2310 | { |
e93f8a0f MT |
2311 | int i, r; |
2312 | struct kvm_io_bus *new_bus, *bus; | |
090b7aff | 2313 | |
e93f8a0f MT |
2314 | new_bus = kzalloc(sizeof(struct kvm_io_bus), GFP_KERNEL); |
2315 | if (!new_bus) | |
2316 | return -ENOMEM; | |
090b7aff | 2317 | |
e93f8a0f MT |
2318 | bus = kvm->buses[bus_idx]; |
2319 | memcpy(new_bus, bus, sizeof(struct kvm_io_bus)); | |
2320 | ||
2321 | r = -ENOENT; | |
2322 | for (i = 0; i < new_bus->dev_count; i++) | |
2323 | if (new_bus->devs[i] == dev) { | |
2324 | r = 0; | |
2325 | new_bus->devs[i] = new_bus->devs[--new_bus->dev_count]; | |
090b7aff GH |
2326 | break; |
2327 | } | |
e93f8a0f MT |
2328 | |
2329 | if (r) { | |
2330 | kfree(new_bus); | |
2331 | return r; | |
2332 | } | |
2333 | ||
2334 | rcu_assign_pointer(kvm->buses[bus_idx], new_bus); | |
2335 | synchronize_srcu_expedited(&kvm->srcu); | |
2336 | kfree(bus); | |
2337 | return r; | |
2eeb2e94 GH |
2338 | } |
2339 | ||
774c47f1 AK |
2340 | static struct notifier_block kvm_cpu_notifier = { |
2341 | .notifier_call = kvm_cpu_hotplug, | |
774c47f1 AK |
2342 | }; |
2343 | ||
8b88b099 | 2344 | static int vm_stat_get(void *_offset, u64 *val) |
ba1389b7 AK |
2345 | { |
2346 | unsigned offset = (long)_offset; | |
ba1389b7 AK |
2347 | struct kvm *kvm; |
2348 | ||
8b88b099 | 2349 | *val = 0; |
ba1389b7 AK |
2350 | spin_lock(&kvm_lock); |
2351 | list_for_each_entry(kvm, &vm_list, vm_list) | |
8b88b099 | 2352 | *val += *(u32 *)((void *)kvm + offset); |
ba1389b7 | 2353 | spin_unlock(&kvm_lock); |
8b88b099 | 2354 | return 0; |
ba1389b7 AK |
2355 | } |
2356 | ||
2357 | DEFINE_SIMPLE_ATTRIBUTE(vm_stat_fops, vm_stat_get, NULL, "%llu\n"); | |
2358 | ||
8b88b099 | 2359 | static int vcpu_stat_get(void *_offset, u64 *val) |
1165f5fe AK |
2360 | { |
2361 | unsigned offset = (long)_offset; | |
1165f5fe AK |
2362 | struct kvm *kvm; |
2363 | struct kvm_vcpu *vcpu; | |
2364 | int i; | |
2365 | ||
8b88b099 | 2366 | *val = 0; |
1165f5fe AK |
2367 | spin_lock(&kvm_lock); |
2368 | list_for_each_entry(kvm, &vm_list, vm_list) | |
988a2cae GN |
2369 | kvm_for_each_vcpu(i, vcpu, kvm) |
2370 | *val += *(u32 *)((void *)vcpu + offset); | |
2371 | ||
1165f5fe | 2372 | spin_unlock(&kvm_lock); |
8b88b099 | 2373 | return 0; |
1165f5fe AK |
2374 | } |
2375 | ||
ba1389b7 AK |
2376 | DEFINE_SIMPLE_ATTRIBUTE(vcpu_stat_fops, vcpu_stat_get, NULL, "%llu\n"); |
2377 | ||
828c0950 | 2378 | static const struct file_operations *stat_fops[] = { |
ba1389b7 AK |
2379 | [KVM_STAT_VCPU] = &vcpu_stat_fops, |
2380 | [KVM_STAT_VM] = &vm_stat_fops, | |
2381 | }; | |
1165f5fe | 2382 | |
a16b043c | 2383 | static void kvm_init_debug(void) |
6aa8b732 AK |
2384 | { |
2385 | struct kvm_stats_debugfs_item *p; | |
2386 | ||
76f7c879 | 2387 | kvm_debugfs_dir = debugfs_create_dir("kvm", NULL); |
6aa8b732 | 2388 | for (p = debugfs_entries; p->name; ++p) |
76f7c879 | 2389 | p->dentry = debugfs_create_file(p->name, 0444, kvm_debugfs_dir, |
1165f5fe | 2390 | (void *)(long)p->offset, |
ba1389b7 | 2391 | stat_fops[p->kind]); |
6aa8b732 AK |
2392 | } |
2393 | ||
2394 | static void kvm_exit_debug(void) | |
2395 | { | |
2396 | struct kvm_stats_debugfs_item *p; | |
2397 | ||
2398 | for (p = debugfs_entries; p->name; ++p) | |
2399 | debugfs_remove(p->dentry); | |
76f7c879 | 2400 | debugfs_remove(kvm_debugfs_dir); |
6aa8b732 AK |
2401 | } |
2402 | ||
59ae6c6b AK |
2403 | static int kvm_suspend(struct sys_device *dev, pm_message_t state) |
2404 | { | |
10474ae8 | 2405 | if (kvm_usage_count) |
75b7127c | 2406 | hardware_disable_nolock(NULL); |
59ae6c6b AK |
2407 | return 0; |
2408 | } | |
2409 | ||
2410 | static int kvm_resume(struct sys_device *dev) | |
2411 | { | |
ca84d1a2 ZA |
2412 | if (kvm_usage_count) { |
2413 | WARN_ON(spin_is_locked(&kvm_lock)); | |
75b7127c | 2414 | hardware_enable_nolock(NULL); |
ca84d1a2 | 2415 | } |
59ae6c6b AK |
2416 | return 0; |
2417 | } | |
2418 | ||
2419 | static struct sysdev_class kvm_sysdev_class = { | |
af5ca3f4 | 2420 | .name = "kvm", |
59ae6c6b AK |
2421 | .suspend = kvm_suspend, |
2422 | .resume = kvm_resume, | |
2423 | }; | |
2424 | ||
2425 | static struct sys_device kvm_sysdev = { | |
2426 | .id = 0, | |
2427 | .cls = &kvm_sysdev_class, | |
2428 | }; | |
2429 | ||
cea7bb21 | 2430 | struct page *bad_page; |
35149e21 | 2431 | pfn_t bad_pfn; |
6aa8b732 | 2432 | |
15ad7146 AK |
2433 | static inline |
2434 | struct kvm_vcpu *preempt_notifier_to_vcpu(struct preempt_notifier *pn) | |
2435 | { | |
2436 | return container_of(pn, struct kvm_vcpu, preempt_notifier); | |
2437 | } | |
2438 | ||
2439 | static void kvm_sched_in(struct preempt_notifier *pn, int cpu) | |
2440 | { | |
2441 | struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn); | |
2442 | ||
e9b11c17 | 2443 | kvm_arch_vcpu_load(vcpu, cpu); |
15ad7146 AK |
2444 | } |
2445 | ||
2446 | static void kvm_sched_out(struct preempt_notifier *pn, | |
2447 | struct task_struct *next) | |
2448 | { | |
2449 | struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn); | |
2450 | ||
e9b11c17 | 2451 | kvm_arch_vcpu_put(vcpu); |
15ad7146 AK |
2452 | } |
2453 | ||
0ee75bea | 2454 | int kvm_init(void *opaque, unsigned vcpu_size, unsigned vcpu_align, |
c16f862d | 2455 | struct module *module) |
6aa8b732 AK |
2456 | { |
2457 | int r; | |
002c7f7c | 2458 | int cpu; |
6aa8b732 | 2459 | |
f8c16bba ZX |
2460 | r = kvm_arch_init(opaque); |
2461 | if (r) | |
d2308784 | 2462 | goto out_fail; |
cb498ea2 ZX |
2463 | |
2464 | bad_page = alloc_page(GFP_KERNEL | __GFP_ZERO); | |
2465 | ||
2466 | if (bad_page == NULL) { | |
2467 | r = -ENOMEM; | |
2468 | goto out; | |
2469 | } | |
2470 | ||
35149e21 AL |
2471 | bad_pfn = page_to_pfn(bad_page); |
2472 | ||
bf998156 HY |
2473 | hwpoison_page = alloc_page(GFP_KERNEL | __GFP_ZERO); |
2474 | ||
2475 | if (hwpoison_page == NULL) { | |
2476 | r = -ENOMEM; | |
2477 | goto out_free_0; | |
2478 | } | |
2479 | ||
2480 | hwpoison_pfn = page_to_pfn(hwpoison_page); | |
2481 | ||
edba23e5 GN |
2482 | fault_page = alloc_page(GFP_KERNEL | __GFP_ZERO); |
2483 | ||
2484 | if (fault_page == NULL) { | |
2485 | r = -ENOMEM; | |
2486 | goto out_free_0; | |
2487 | } | |
2488 | ||
2489 | fault_pfn = page_to_pfn(fault_page); | |
2490 | ||
8437a617 | 2491 | if (!zalloc_cpumask_var(&cpus_hardware_enabled, GFP_KERNEL)) { |
7f59f492 RR |
2492 | r = -ENOMEM; |
2493 | goto out_free_0; | |
2494 | } | |
2495 | ||
e9b11c17 | 2496 | r = kvm_arch_hardware_setup(); |
6aa8b732 | 2497 | if (r < 0) |
7f59f492 | 2498 | goto out_free_0a; |
6aa8b732 | 2499 | |
002c7f7c YS |
2500 | for_each_online_cpu(cpu) { |
2501 | smp_call_function_single(cpu, | |
e9b11c17 | 2502 | kvm_arch_check_processor_compat, |
8691e5a8 | 2503 | &r, 1); |
002c7f7c | 2504 | if (r < 0) |
d2308784 | 2505 | goto out_free_1; |
002c7f7c YS |
2506 | } |
2507 | ||
774c47f1 AK |
2508 | r = register_cpu_notifier(&kvm_cpu_notifier); |
2509 | if (r) | |
d2308784 | 2510 | goto out_free_2; |
6aa8b732 AK |
2511 | register_reboot_notifier(&kvm_reboot_notifier); |
2512 | ||
59ae6c6b AK |
2513 | r = sysdev_class_register(&kvm_sysdev_class); |
2514 | if (r) | |
d2308784 | 2515 | goto out_free_3; |
59ae6c6b AK |
2516 | |
2517 | r = sysdev_register(&kvm_sysdev); | |
2518 | if (r) | |
d2308784 | 2519 | goto out_free_4; |
59ae6c6b | 2520 | |
c16f862d | 2521 | /* A kmem cache lets us meet the alignment requirements of fx_save. */ |
0ee75bea AK |
2522 | if (!vcpu_align) |
2523 | vcpu_align = __alignof__(struct kvm_vcpu); | |
2524 | kvm_vcpu_cache = kmem_cache_create("kvm_vcpu", vcpu_size, vcpu_align, | |
56919c5c | 2525 | 0, NULL); |
c16f862d RR |
2526 | if (!kvm_vcpu_cache) { |
2527 | r = -ENOMEM; | |
d2308784 | 2528 | goto out_free_5; |
c16f862d RR |
2529 | } |
2530 | ||
af585b92 GN |
2531 | r = kvm_async_pf_init(); |
2532 | if (r) | |
2533 | goto out_free; | |
2534 | ||
6aa8b732 | 2535 | kvm_chardev_ops.owner = module; |
3d3aab1b CB |
2536 | kvm_vm_fops.owner = module; |
2537 | kvm_vcpu_fops.owner = module; | |
6aa8b732 AK |
2538 | |
2539 | r = misc_register(&kvm_dev); | |
2540 | if (r) { | |
d77c26fc | 2541 | printk(KERN_ERR "kvm: misc device register failed\n"); |
af585b92 | 2542 | goto out_unreg; |
6aa8b732 AK |
2543 | } |
2544 | ||
15ad7146 AK |
2545 | kvm_preempt_ops.sched_in = kvm_sched_in; |
2546 | kvm_preempt_ops.sched_out = kvm_sched_out; | |
2547 | ||
0ea4ed8e DW |
2548 | kvm_init_debug(); |
2549 | ||
c7addb90 | 2550 | return 0; |
6aa8b732 | 2551 | |
af585b92 GN |
2552 | out_unreg: |
2553 | kvm_async_pf_deinit(); | |
6aa8b732 | 2554 | out_free: |
c16f862d | 2555 | kmem_cache_destroy(kvm_vcpu_cache); |
d2308784 | 2556 | out_free_5: |
59ae6c6b | 2557 | sysdev_unregister(&kvm_sysdev); |
d2308784 | 2558 | out_free_4: |
59ae6c6b | 2559 | sysdev_class_unregister(&kvm_sysdev_class); |
d2308784 | 2560 | out_free_3: |
6aa8b732 | 2561 | unregister_reboot_notifier(&kvm_reboot_notifier); |
774c47f1 | 2562 | unregister_cpu_notifier(&kvm_cpu_notifier); |
d2308784 | 2563 | out_free_2: |
d2308784 | 2564 | out_free_1: |
e9b11c17 | 2565 | kvm_arch_hardware_unsetup(); |
7f59f492 RR |
2566 | out_free_0a: |
2567 | free_cpumask_var(cpus_hardware_enabled); | |
d2308784 | 2568 | out_free_0: |
edba23e5 GN |
2569 | if (fault_page) |
2570 | __free_page(fault_page); | |
bf998156 HY |
2571 | if (hwpoison_page) |
2572 | __free_page(hwpoison_page); | |
d2308784 | 2573 | __free_page(bad_page); |
ca45aaae | 2574 | out: |
f8c16bba | 2575 | kvm_arch_exit(); |
d2308784 | 2576 | out_fail: |
6aa8b732 AK |
2577 | return r; |
2578 | } | |
cb498ea2 | 2579 | EXPORT_SYMBOL_GPL(kvm_init); |
6aa8b732 | 2580 | |
cb498ea2 | 2581 | void kvm_exit(void) |
6aa8b732 | 2582 | { |
0ea4ed8e | 2583 | kvm_exit_debug(); |
6aa8b732 | 2584 | misc_deregister(&kvm_dev); |
c16f862d | 2585 | kmem_cache_destroy(kvm_vcpu_cache); |
af585b92 | 2586 | kvm_async_pf_deinit(); |
59ae6c6b AK |
2587 | sysdev_unregister(&kvm_sysdev); |
2588 | sysdev_class_unregister(&kvm_sysdev_class); | |
6aa8b732 | 2589 | unregister_reboot_notifier(&kvm_reboot_notifier); |
59ae6c6b | 2590 | unregister_cpu_notifier(&kvm_cpu_notifier); |
75b7127c | 2591 | on_each_cpu(hardware_disable_nolock, NULL, 1); |
e9b11c17 | 2592 | kvm_arch_hardware_unsetup(); |
f8c16bba | 2593 | kvm_arch_exit(); |
7f59f492 | 2594 | free_cpumask_var(cpus_hardware_enabled); |
bf998156 | 2595 | __free_page(hwpoison_page); |
cea7bb21 | 2596 | __free_page(bad_page); |
6aa8b732 | 2597 | } |
cb498ea2 | 2598 | EXPORT_SYMBOL_GPL(kvm_exit); |