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Commit | Line | Data |
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6aa8b732 AK |
1 | /* |
2 | * Kernel-based Virtual Machine driver for Linux | |
3 | * | |
4 | * This module enables machines with Intel VT-x extensions to run virtual | |
5 | * machines without emulation or binary translation. | |
6 | * | |
7 | * Copyright (C) 2006 Qumranet, Inc. | |
9611c187 | 8 | * Copyright 2010 Red Hat, Inc. and/or its affiliates. |
6aa8b732 AK |
9 | * |
10 | * Authors: | |
11 | * Avi Kivity <avi@qumranet.com> | |
12 | * Yaniv Kamay <yaniv@qumranet.com> | |
13 | * | |
14 | * This work is licensed under the terms of the GNU GPL, version 2. See | |
15 | * the COPYING file in the top-level directory. | |
16 | * | |
17 | */ | |
18 | ||
e2174021 | 19 | #include "iodev.h" |
6aa8b732 | 20 | |
edf88417 | 21 | #include <linux/kvm_host.h> |
6aa8b732 AK |
22 | #include <linux/kvm.h> |
23 | #include <linux/module.h> | |
24 | #include <linux/errno.h> | |
6aa8b732 | 25 | #include <linux/percpu.h> |
6aa8b732 AK |
26 | #include <linux/mm.h> |
27 | #include <linux/miscdevice.h> | |
28 | #include <linux/vmalloc.h> | |
6aa8b732 | 29 | #include <linux/reboot.h> |
6aa8b732 AK |
30 | #include <linux/debugfs.h> |
31 | #include <linux/highmem.h> | |
32 | #include <linux/file.h> | |
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 | |
70e335e1 | 168 | raw_spin_lock(&kvm->requests_lock); |
e601e3be | 169 | me = smp_processor_id(); |
988a2cae | 170 | kvm_for_each_vcpu(i, vcpu, kvm) { |
a8eeb04a | 171 | if (kvm_make_check_request(req, vcpu)) |
d9e368d6 AK |
172 | continue; |
173 | cpu = vcpu->cpu; | |
6b7e2d09 XG |
174 | |
175 | /* Set ->requests bit before we read ->mode */ | |
176 | smp_mb(); | |
177 | ||
178 | if (cpus != NULL && cpu != -1 && cpu != me && | |
179 | kvm_vcpu_exiting_guest_mode(vcpu) != OUTSIDE_GUEST_MODE) | |
6ef7a1bc | 180 | cpumask_set_cpu(cpu, cpus); |
49846896 | 181 | } |
6ef7a1bc RR |
182 | if (unlikely(cpus == NULL)) |
183 | smp_call_function_many(cpu_online_mask, ack_flush, NULL, 1); | |
184 | else if (!cpumask_empty(cpus)) | |
185 | smp_call_function_many(cpus, ack_flush, NULL, 1); | |
186 | else | |
187 | called = false; | |
70e335e1 | 188 | raw_spin_unlock(&kvm->requests_lock); |
6ef7a1bc | 189 | free_cpumask_var(cpus); |
49846896 | 190 | return called; |
d9e368d6 AK |
191 | } |
192 | ||
49846896 | 193 | void kvm_flush_remote_tlbs(struct kvm *kvm) |
2e53d63a | 194 | { |
a4ee1ca4 XG |
195 | int dirty_count = kvm->tlbs_dirty; |
196 | ||
197 | smp_mb(); | |
49846896 RR |
198 | if (make_all_cpus_request(kvm, KVM_REQ_TLB_FLUSH)) |
199 | ++kvm->stat.remote_tlb_flush; | |
a4ee1ca4 | 200 | cmpxchg(&kvm->tlbs_dirty, dirty_count, 0); |
2e53d63a MT |
201 | } |
202 | ||
49846896 RR |
203 | void kvm_reload_remote_mmus(struct kvm *kvm) |
204 | { | |
205 | make_all_cpus_request(kvm, KVM_REQ_MMU_RELOAD); | |
206 | } | |
2e53d63a | 207 | |
fb3f0f51 RR |
208 | int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id) |
209 | { | |
210 | struct page *page; | |
211 | int r; | |
212 | ||
213 | mutex_init(&vcpu->mutex); | |
214 | vcpu->cpu = -1; | |
fb3f0f51 RR |
215 | vcpu->kvm = kvm; |
216 | vcpu->vcpu_id = id; | |
b6958ce4 | 217 | init_waitqueue_head(&vcpu->wq); |
af585b92 | 218 | kvm_async_pf_vcpu_init(vcpu); |
fb3f0f51 RR |
219 | |
220 | page = alloc_page(GFP_KERNEL | __GFP_ZERO); | |
221 | if (!page) { | |
222 | r = -ENOMEM; | |
223 | goto fail; | |
224 | } | |
225 | vcpu->run = page_address(page); | |
226 | ||
e9b11c17 | 227 | r = kvm_arch_vcpu_init(vcpu); |
fb3f0f51 | 228 | if (r < 0) |
e9b11c17 | 229 | goto fail_free_run; |
fb3f0f51 RR |
230 | return 0; |
231 | ||
fb3f0f51 RR |
232 | fail_free_run: |
233 | free_page((unsigned long)vcpu->run); | |
234 | fail: | |
76fafa5e | 235 | return r; |
fb3f0f51 RR |
236 | } |
237 | EXPORT_SYMBOL_GPL(kvm_vcpu_init); | |
238 | ||
239 | void kvm_vcpu_uninit(struct kvm_vcpu *vcpu) | |
240 | { | |
e9b11c17 | 241 | kvm_arch_vcpu_uninit(vcpu); |
fb3f0f51 RR |
242 | free_page((unsigned long)vcpu->run); |
243 | } | |
244 | EXPORT_SYMBOL_GPL(kvm_vcpu_uninit); | |
245 | ||
e930bffe AA |
246 | #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER) |
247 | static inline struct kvm *mmu_notifier_to_kvm(struct mmu_notifier *mn) | |
248 | { | |
249 | return container_of(mn, struct kvm, mmu_notifier); | |
250 | } | |
251 | ||
252 | static void kvm_mmu_notifier_invalidate_page(struct mmu_notifier *mn, | |
253 | struct mm_struct *mm, | |
254 | unsigned long address) | |
255 | { | |
256 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
bc6678a3 | 257 | int need_tlb_flush, idx; |
e930bffe AA |
258 | |
259 | /* | |
260 | * When ->invalidate_page runs, the linux pte has been zapped | |
261 | * already but the page is still allocated until | |
262 | * ->invalidate_page returns. So if we increase the sequence | |
263 | * here the kvm page fault will notice if the spte can't be | |
264 | * established because the page is going to be freed. If | |
265 | * instead the kvm page fault establishes the spte before | |
266 | * ->invalidate_page runs, kvm_unmap_hva will release it | |
267 | * before returning. | |
268 | * | |
269 | * The sequence increase only need to be seen at spin_unlock | |
270 | * time, and not at spin_lock time. | |
271 | * | |
272 | * Increasing the sequence after the spin_unlock would be | |
273 | * unsafe because the kvm page fault could then establish the | |
274 | * pte after kvm_unmap_hva returned, without noticing the page | |
275 | * is going to be freed. | |
276 | */ | |
bc6678a3 | 277 | idx = srcu_read_lock(&kvm->srcu); |
e930bffe AA |
278 | spin_lock(&kvm->mmu_lock); |
279 | kvm->mmu_notifier_seq++; | |
a4ee1ca4 | 280 | need_tlb_flush = kvm_unmap_hva(kvm, address) | kvm->tlbs_dirty; |
e930bffe | 281 | spin_unlock(&kvm->mmu_lock); |
bc6678a3 | 282 | srcu_read_unlock(&kvm->srcu, idx); |
e930bffe AA |
283 | |
284 | /* we've to flush the tlb before the pages can be freed */ | |
285 | if (need_tlb_flush) | |
286 | kvm_flush_remote_tlbs(kvm); | |
287 | ||
288 | } | |
289 | ||
3da0dd43 IE |
290 | static void kvm_mmu_notifier_change_pte(struct mmu_notifier *mn, |
291 | struct mm_struct *mm, | |
292 | unsigned long address, | |
293 | pte_t pte) | |
294 | { | |
295 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
bc6678a3 | 296 | int idx; |
3da0dd43 | 297 | |
bc6678a3 | 298 | idx = srcu_read_lock(&kvm->srcu); |
3da0dd43 IE |
299 | spin_lock(&kvm->mmu_lock); |
300 | kvm->mmu_notifier_seq++; | |
301 | kvm_set_spte_hva(kvm, address, pte); | |
302 | spin_unlock(&kvm->mmu_lock); | |
bc6678a3 | 303 | srcu_read_unlock(&kvm->srcu, idx); |
3da0dd43 IE |
304 | } |
305 | ||
e930bffe AA |
306 | static void kvm_mmu_notifier_invalidate_range_start(struct mmu_notifier *mn, |
307 | struct mm_struct *mm, | |
308 | unsigned long start, | |
309 | unsigned long end) | |
310 | { | |
311 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
bc6678a3 | 312 | int need_tlb_flush = 0, idx; |
e930bffe | 313 | |
bc6678a3 | 314 | idx = srcu_read_lock(&kvm->srcu); |
e930bffe AA |
315 | spin_lock(&kvm->mmu_lock); |
316 | /* | |
317 | * The count increase must become visible at unlock time as no | |
318 | * spte can be established without taking the mmu_lock and | |
319 | * count is also read inside the mmu_lock critical section. | |
320 | */ | |
321 | kvm->mmu_notifier_count++; | |
322 | for (; start < end; start += PAGE_SIZE) | |
323 | need_tlb_flush |= kvm_unmap_hva(kvm, start); | |
a4ee1ca4 | 324 | need_tlb_flush |= kvm->tlbs_dirty; |
e930bffe | 325 | spin_unlock(&kvm->mmu_lock); |
bc6678a3 | 326 | srcu_read_unlock(&kvm->srcu, idx); |
e930bffe AA |
327 | |
328 | /* we've to flush the tlb before the pages can be freed */ | |
329 | if (need_tlb_flush) | |
330 | kvm_flush_remote_tlbs(kvm); | |
331 | } | |
332 | ||
333 | static void kvm_mmu_notifier_invalidate_range_end(struct mmu_notifier *mn, | |
334 | struct mm_struct *mm, | |
335 | unsigned long start, | |
336 | unsigned long end) | |
337 | { | |
338 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
339 | ||
340 | spin_lock(&kvm->mmu_lock); | |
341 | /* | |
342 | * This sequence increase will notify the kvm page fault that | |
343 | * the page that is going to be mapped in the spte could have | |
344 | * been freed. | |
345 | */ | |
346 | kvm->mmu_notifier_seq++; | |
347 | /* | |
348 | * The above sequence increase must be visible before the | |
349 | * below count decrease but both values are read by the kvm | |
350 | * page fault under mmu_lock spinlock so we don't need to add | |
351 | * a smb_wmb() here in between the two. | |
352 | */ | |
353 | kvm->mmu_notifier_count--; | |
354 | spin_unlock(&kvm->mmu_lock); | |
355 | ||
356 | BUG_ON(kvm->mmu_notifier_count < 0); | |
357 | } | |
358 | ||
359 | static int kvm_mmu_notifier_clear_flush_young(struct mmu_notifier *mn, | |
360 | struct mm_struct *mm, | |
361 | unsigned long address) | |
362 | { | |
363 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
bc6678a3 | 364 | int young, idx; |
e930bffe | 365 | |
bc6678a3 | 366 | idx = srcu_read_lock(&kvm->srcu); |
e930bffe AA |
367 | spin_lock(&kvm->mmu_lock); |
368 | young = kvm_age_hva(kvm, address); | |
369 | spin_unlock(&kvm->mmu_lock); | |
bc6678a3 | 370 | srcu_read_unlock(&kvm->srcu, idx); |
e930bffe AA |
371 | |
372 | if (young) | |
373 | kvm_flush_remote_tlbs(kvm); | |
374 | ||
375 | return young; | |
376 | } | |
377 | ||
8ee53820 AA |
378 | static int kvm_mmu_notifier_test_young(struct mmu_notifier *mn, |
379 | struct mm_struct *mm, | |
380 | unsigned long address) | |
381 | { | |
382 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
383 | int young, idx; | |
384 | ||
385 | idx = srcu_read_lock(&kvm->srcu); | |
386 | spin_lock(&kvm->mmu_lock); | |
387 | young = kvm_test_age_hva(kvm, address); | |
388 | spin_unlock(&kvm->mmu_lock); | |
389 | srcu_read_unlock(&kvm->srcu, idx); | |
390 | ||
391 | return young; | |
392 | } | |
393 | ||
85db06e5 MT |
394 | static void kvm_mmu_notifier_release(struct mmu_notifier *mn, |
395 | struct mm_struct *mm) | |
396 | { | |
397 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
eda2beda LJ |
398 | int idx; |
399 | ||
400 | idx = srcu_read_lock(&kvm->srcu); | |
85db06e5 | 401 | kvm_arch_flush_shadow(kvm); |
eda2beda | 402 | srcu_read_unlock(&kvm->srcu, idx); |
85db06e5 MT |
403 | } |
404 | ||
e930bffe AA |
405 | static const struct mmu_notifier_ops kvm_mmu_notifier_ops = { |
406 | .invalidate_page = kvm_mmu_notifier_invalidate_page, | |
407 | .invalidate_range_start = kvm_mmu_notifier_invalidate_range_start, | |
408 | .invalidate_range_end = kvm_mmu_notifier_invalidate_range_end, | |
409 | .clear_flush_young = kvm_mmu_notifier_clear_flush_young, | |
8ee53820 | 410 | .test_young = kvm_mmu_notifier_test_young, |
3da0dd43 | 411 | .change_pte = kvm_mmu_notifier_change_pte, |
85db06e5 | 412 | .release = kvm_mmu_notifier_release, |
e930bffe | 413 | }; |
4c07b0a4 AK |
414 | |
415 | static int kvm_init_mmu_notifier(struct kvm *kvm) | |
416 | { | |
417 | kvm->mmu_notifier.ops = &kvm_mmu_notifier_ops; | |
418 | return mmu_notifier_register(&kvm->mmu_notifier, current->mm); | |
419 | } | |
420 | ||
421 | #else /* !(CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER) */ | |
422 | ||
423 | static int kvm_init_mmu_notifier(struct kvm *kvm) | |
424 | { | |
425 | return 0; | |
426 | } | |
427 | ||
e930bffe AA |
428 | #endif /* CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER */ |
429 | ||
f17abe9a | 430 | static struct kvm *kvm_create_vm(void) |
6aa8b732 | 431 | { |
d89f5eff JK |
432 | int r, i; |
433 | struct kvm *kvm = kvm_arch_alloc_vm(); | |
6aa8b732 | 434 | |
d89f5eff JK |
435 | if (!kvm) |
436 | return ERR_PTR(-ENOMEM); | |
437 | ||
438 | r = kvm_arch_init_vm(kvm); | |
439 | if (r) | |
440 | goto out_err_nodisable; | |
10474ae8 AG |
441 | |
442 | r = hardware_enable_all(); | |
443 | if (r) | |
444 | goto out_err_nodisable; | |
445 | ||
75858a84 AK |
446 | #ifdef CONFIG_HAVE_KVM_IRQCHIP |
447 | INIT_HLIST_HEAD(&kvm->mask_notifier_list); | |
136bdfee | 448 | INIT_HLIST_HEAD(&kvm->irq_ack_notifier_list); |
75858a84 | 449 | #endif |
6aa8b732 | 450 | |
46a26bf5 MT |
451 | r = -ENOMEM; |
452 | kvm->memslots = kzalloc(sizeof(struct kvm_memslots), GFP_KERNEL); | |
453 | if (!kvm->memslots) | |
57e7fbee | 454 | goto out_err_nosrcu; |
bc6678a3 | 455 | if (init_srcu_struct(&kvm->srcu)) |
57e7fbee | 456 | goto out_err_nosrcu; |
e93f8a0f MT |
457 | for (i = 0; i < KVM_NR_BUSES; i++) { |
458 | kvm->buses[i] = kzalloc(sizeof(struct kvm_io_bus), | |
459 | GFP_KERNEL); | |
57e7fbee | 460 | if (!kvm->buses[i]) |
e93f8a0f | 461 | goto out_err; |
e93f8a0f | 462 | } |
46a26bf5 | 463 | |
4c07b0a4 | 464 | r = kvm_init_mmu_notifier(kvm); |
57e7fbee | 465 | if (r) |
283d0c65 | 466 | goto out_err; |
e930bffe | 467 | |
6d4e4c4f AK |
468 | kvm->mm = current->mm; |
469 | atomic_inc(&kvm->mm->mm_count); | |
aaee2c94 | 470 | spin_lock_init(&kvm->mmu_lock); |
70e335e1 | 471 | raw_spin_lock_init(&kvm->requests_lock); |
d34e6b17 | 472 | kvm_eventfd_init(kvm); |
11ec2804 | 473 | mutex_init(&kvm->lock); |
60eead79 | 474 | mutex_init(&kvm->irq_lock); |
79fac95e | 475 | mutex_init(&kvm->slots_lock); |
d39f13b0 | 476 | atomic_set(&kvm->users_count, 1); |
5e58cfe4 RR |
477 | spin_lock(&kvm_lock); |
478 | list_add(&kvm->vm_list, &vm_list); | |
479 | spin_unlock(&kvm_lock); | |
d89f5eff | 480 | |
f17abe9a | 481 | return kvm; |
10474ae8 AG |
482 | |
483 | out_err: | |
57e7fbee JK |
484 | cleanup_srcu_struct(&kvm->srcu); |
485 | out_err_nosrcu: | |
10474ae8 AG |
486 | hardware_disable_all(); |
487 | out_err_nodisable: | |
e93f8a0f MT |
488 | for (i = 0; i < KVM_NR_BUSES; i++) |
489 | kfree(kvm->buses[i]); | |
46a26bf5 | 490 | kfree(kvm->memslots); |
d89f5eff | 491 | kvm_arch_free_vm(kvm); |
10474ae8 | 492 | return ERR_PTR(r); |
f17abe9a AK |
493 | } |
494 | ||
a36a57b1 TY |
495 | static void kvm_destroy_dirty_bitmap(struct kvm_memory_slot *memslot) |
496 | { | |
497 | if (!memslot->dirty_bitmap) | |
498 | return; | |
499 | ||
6f9e5c17 TY |
500 | if (2 * kvm_dirty_bitmap_bytes(memslot) > PAGE_SIZE) |
501 | vfree(memslot->dirty_bitmap_head); | |
502 | else | |
503 | kfree(memslot->dirty_bitmap_head); | |
504 | ||
a36a57b1 | 505 | memslot->dirty_bitmap = NULL; |
515a0127 | 506 | memslot->dirty_bitmap_head = NULL; |
a36a57b1 TY |
507 | } |
508 | ||
6aa8b732 AK |
509 | /* |
510 | * Free any memory in @free but not in @dont. | |
511 | */ | |
512 | static void kvm_free_physmem_slot(struct kvm_memory_slot *free, | |
513 | struct kvm_memory_slot *dont) | |
514 | { | |
ec04b260 JR |
515 | int i; |
516 | ||
290fc38d IE |
517 | if (!dont || free->rmap != dont->rmap) |
518 | vfree(free->rmap); | |
6aa8b732 AK |
519 | |
520 | if (!dont || free->dirty_bitmap != dont->dirty_bitmap) | |
a36a57b1 | 521 | kvm_destroy_dirty_bitmap(free); |
6aa8b732 | 522 | |
ec04b260 JR |
523 | |
524 | for (i = 0; i < KVM_NR_PAGE_SIZES - 1; ++i) { | |
525 | if (!dont || free->lpage_info[i] != dont->lpage_info[i]) { | |
526 | vfree(free->lpage_info[i]); | |
527 | free->lpage_info[i] = NULL; | |
528 | } | |
529 | } | |
05da4558 | 530 | |
6aa8b732 | 531 | free->npages = 0; |
8d4e1288 | 532 | free->rmap = NULL; |
6aa8b732 AK |
533 | } |
534 | ||
d19a9cd2 | 535 | void kvm_free_physmem(struct kvm *kvm) |
6aa8b732 AK |
536 | { |
537 | int i; | |
46a26bf5 MT |
538 | struct kvm_memslots *slots = kvm->memslots; |
539 | ||
540 | for (i = 0; i < slots->nmemslots; ++i) | |
541 | kvm_free_physmem_slot(&slots->memslots[i], NULL); | |
6aa8b732 | 542 | |
46a26bf5 | 543 | kfree(kvm->memslots); |
6aa8b732 AK |
544 | } |
545 | ||
f17abe9a AK |
546 | static void kvm_destroy_vm(struct kvm *kvm) |
547 | { | |
e93f8a0f | 548 | int i; |
6d4e4c4f AK |
549 | struct mm_struct *mm = kvm->mm; |
550 | ||
ad8ba2cd | 551 | kvm_arch_sync_events(kvm); |
133de902 AK |
552 | spin_lock(&kvm_lock); |
553 | list_del(&kvm->vm_list); | |
554 | spin_unlock(&kvm_lock); | |
399ec807 | 555 | kvm_free_irq_routing(kvm); |
e93f8a0f MT |
556 | for (i = 0; i < KVM_NR_BUSES; i++) |
557 | kvm_io_bus_destroy(kvm->buses[i]); | |
980da6ce | 558 | kvm_coalesced_mmio_free(kvm); |
e930bffe AA |
559 | #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER) |
560 | mmu_notifier_unregister(&kvm->mmu_notifier, kvm->mm); | |
f00be0ca GN |
561 | #else |
562 | kvm_arch_flush_shadow(kvm); | |
5f94c174 | 563 | #endif |
d19a9cd2 | 564 | kvm_arch_destroy_vm(kvm); |
d89f5eff JK |
565 | kvm_free_physmem(kvm); |
566 | cleanup_srcu_struct(&kvm->srcu); | |
567 | kvm_arch_free_vm(kvm); | |
10474ae8 | 568 | hardware_disable_all(); |
6d4e4c4f | 569 | mmdrop(mm); |
f17abe9a AK |
570 | } |
571 | ||
d39f13b0 IE |
572 | void kvm_get_kvm(struct kvm *kvm) |
573 | { | |
574 | atomic_inc(&kvm->users_count); | |
575 | } | |
576 | EXPORT_SYMBOL_GPL(kvm_get_kvm); | |
577 | ||
578 | void kvm_put_kvm(struct kvm *kvm) | |
579 | { | |
580 | if (atomic_dec_and_test(&kvm->users_count)) | |
581 | kvm_destroy_vm(kvm); | |
582 | } | |
583 | EXPORT_SYMBOL_GPL(kvm_put_kvm); | |
584 | ||
585 | ||
f17abe9a AK |
586 | static int kvm_vm_release(struct inode *inode, struct file *filp) |
587 | { | |
588 | struct kvm *kvm = filp->private_data; | |
589 | ||
721eecbf GH |
590 | kvm_irqfd_release(kvm); |
591 | ||
d39f13b0 | 592 | kvm_put_kvm(kvm); |
6aa8b732 AK |
593 | return 0; |
594 | } | |
595 | ||
d48ead8b | 596 | #ifndef CONFIG_S390 |
515a0127 TY |
597 | /* |
598 | * Allocation size is twice as large as the actual dirty bitmap size. | |
599 | * This makes it possible to do double buffering: see x86's | |
600 | * kvm_vm_ioctl_get_dirty_log(). | |
601 | */ | |
a36a57b1 TY |
602 | static int kvm_create_dirty_bitmap(struct kvm_memory_slot *memslot) |
603 | { | |
515a0127 | 604 | unsigned long dirty_bytes = 2 * kvm_dirty_bitmap_bytes(memslot); |
a36a57b1 | 605 | |
6f9e5c17 TY |
606 | if (dirty_bytes > PAGE_SIZE) |
607 | memslot->dirty_bitmap = vzalloc(dirty_bytes); | |
608 | else | |
609 | memslot->dirty_bitmap = kzalloc(dirty_bytes, GFP_KERNEL); | |
610 | ||
a36a57b1 TY |
611 | if (!memslot->dirty_bitmap) |
612 | return -ENOMEM; | |
613 | ||
515a0127 | 614 | memslot->dirty_bitmap_head = memslot->dirty_bitmap; |
a36a57b1 TY |
615 | return 0; |
616 | } | |
d48ead8b | 617 | #endif /* !CONFIG_S390 */ |
a36a57b1 | 618 | |
6aa8b732 AK |
619 | /* |
620 | * Allocate some memory and give it an address in the guest physical address | |
621 | * space. | |
622 | * | |
623 | * Discontiguous memory is allowed, mostly for framebuffers. | |
f78e0e2e | 624 | * |
10589a46 | 625 | * Must be called holding mmap_sem for write. |
6aa8b732 | 626 | */ |
f78e0e2e SY |
627 | int __kvm_set_memory_region(struct kvm *kvm, |
628 | struct kvm_userspace_memory_region *mem, | |
629 | int user_alloc) | |
6aa8b732 | 630 | { |
8234b22e | 631 | int r; |
6aa8b732 | 632 | gfn_t base_gfn; |
28bcb112 HC |
633 | unsigned long npages; |
634 | unsigned long i; | |
6aa8b732 AK |
635 | struct kvm_memory_slot *memslot; |
636 | struct kvm_memory_slot old, new; | |
bc6678a3 | 637 | struct kvm_memslots *slots, *old_memslots; |
6aa8b732 AK |
638 | |
639 | r = -EINVAL; | |
640 | /* General sanity checks */ | |
641 | if (mem->memory_size & (PAGE_SIZE - 1)) | |
642 | goto out; | |
643 | if (mem->guest_phys_addr & (PAGE_SIZE - 1)) | |
644 | goto out; | |
e7cacd40 | 645 | if (user_alloc && (mem->userspace_addr & (PAGE_SIZE - 1))) |
78749809 | 646 | goto out; |
e0d62c7f | 647 | if (mem->slot >= KVM_MEMORY_SLOTS + KVM_PRIVATE_MEM_SLOTS) |
6aa8b732 AK |
648 | goto out; |
649 | if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr) | |
650 | goto out; | |
651 | ||
46a26bf5 | 652 | memslot = &kvm->memslots->memslots[mem->slot]; |
6aa8b732 AK |
653 | base_gfn = mem->guest_phys_addr >> PAGE_SHIFT; |
654 | npages = mem->memory_size >> PAGE_SHIFT; | |
655 | ||
660c22c4 TY |
656 | r = -EINVAL; |
657 | if (npages > KVM_MEM_MAX_NR_PAGES) | |
658 | goto out; | |
659 | ||
6aa8b732 AK |
660 | if (!npages) |
661 | mem->flags &= ~KVM_MEM_LOG_DIRTY_PAGES; | |
662 | ||
6aa8b732 AK |
663 | new = old = *memslot; |
664 | ||
e36d96f7 | 665 | new.id = mem->slot; |
6aa8b732 AK |
666 | new.base_gfn = base_gfn; |
667 | new.npages = npages; | |
668 | new.flags = mem->flags; | |
669 | ||
670 | /* Disallow changing a memory slot's size. */ | |
671 | r = -EINVAL; | |
672 | if (npages && old.npages && npages != old.npages) | |
f78e0e2e | 673 | goto out_free; |
6aa8b732 AK |
674 | |
675 | /* Check for overlaps */ | |
676 | r = -EEXIST; | |
677 | for (i = 0; i < KVM_MEMORY_SLOTS; ++i) { | |
46a26bf5 | 678 | struct kvm_memory_slot *s = &kvm->memslots->memslots[i]; |
6aa8b732 | 679 | |
4cd481f6 | 680 | if (s == memslot || !s->npages) |
6aa8b732 AK |
681 | continue; |
682 | if (!((base_gfn + npages <= s->base_gfn) || | |
683 | (base_gfn >= s->base_gfn + s->npages))) | |
f78e0e2e | 684 | goto out_free; |
6aa8b732 | 685 | } |
6aa8b732 | 686 | |
6aa8b732 AK |
687 | /* Free page dirty bitmap if unneeded */ |
688 | if (!(new.flags & KVM_MEM_LOG_DIRTY_PAGES)) | |
8b6d44c7 | 689 | new.dirty_bitmap = NULL; |
6aa8b732 AK |
690 | |
691 | r = -ENOMEM; | |
692 | ||
693 | /* Allocate if a slot is being created */ | |
eff0114a | 694 | #ifndef CONFIG_S390 |
8d4e1288 | 695 | if (npages && !new.rmap) { |
26535037 | 696 | new.rmap = vzalloc(npages * sizeof(*new.rmap)); |
290fc38d IE |
697 | |
698 | if (!new.rmap) | |
f78e0e2e | 699 | goto out_free; |
290fc38d | 700 | |
80b14b5b | 701 | new.user_alloc = user_alloc; |
bc6678a3 | 702 | new.userspace_addr = mem->userspace_addr; |
6aa8b732 | 703 | } |
ec04b260 JR |
704 | if (!npages) |
705 | goto skip_lpage; | |
05da4558 | 706 | |
ec04b260 | 707 | for (i = 0; i < KVM_NR_PAGE_SIZES - 1; ++i) { |
28bcb112 HC |
708 | unsigned long ugfn; |
709 | unsigned long j; | |
710 | int lpages; | |
ec04b260 | 711 | int level = i + 2; |
05da4558 | 712 | |
ec04b260 JR |
713 | /* Avoid unused variable warning if no large pages */ |
714 | (void)level; | |
715 | ||
716 | if (new.lpage_info[i]) | |
717 | continue; | |
718 | ||
82855413 JR |
719 | lpages = 1 + ((base_gfn + npages - 1) |
720 | >> KVM_HPAGE_GFN_SHIFT(level)); | |
721 | lpages -= base_gfn >> KVM_HPAGE_GFN_SHIFT(level); | |
ec04b260 | 722 | |
26535037 | 723 | new.lpage_info[i] = vzalloc(lpages * sizeof(*new.lpage_info[i])); |
ec04b260 JR |
724 | |
725 | if (!new.lpage_info[i]) | |
05da4558 MT |
726 | goto out_free; |
727 | ||
82855413 | 728 | if (base_gfn & (KVM_PAGES_PER_HPAGE(level) - 1)) |
ec04b260 | 729 | new.lpage_info[i][0].write_count = 1; |
82855413 | 730 | if ((base_gfn+npages) & (KVM_PAGES_PER_HPAGE(level) - 1)) |
ec04b260 | 731 | new.lpage_info[i][lpages - 1].write_count = 1; |
ac04527f AK |
732 | ugfn = new.userspace_addr >> PAGE_SHIFT; |
733 | /* | |
734 | * If the gfn and userspace address are not aligned wrt each | |
54dee993 MT |
735 | * other, or if explicitly asked to, disable large page |
736 | * support for this slot | |
ac04527f | 737 | */ |
ec04b260 | 738 | if ((base_gfn ^ ugfn) & (KVM_PAGES_PER_HPAGE(level) - 1) || |
54dee993 | 739 | !largepages_enabled) |
ec04b260 JR |
740 | for (j = 0; j < lpages; ++j) |
741 | new.lpage_info[i][j].write_count = 1; | |
05da4558 | 742 | } |
6aa8b732 | 743 | |
ec04b260 JR |
744 | skip_lpage: |
745 | ||
6aa8b732 AK |
746 | /* Allocate page dirty bitmap if needed */ |
747 | if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) { | |
a36a57b1 | 748 | if (kvm_create_dirty_bitmap(&new) < 0) |
f78e0e2e | 749 | goto out_free; |
bc6678a3 | 750 | /* destroy any largepage mappings for dirty tracking */ |
6aa8b732 | 751 | } |
3eea8437 CB |
752 | #else /* not defined CONFIG_S390 */ |
753 | new.user_alloc = user_alloc; | |
754 | if (user_alloc) | |
755 | new.userspace_addr = mem->userspace_addr; | |
eff0114a | 756 | #endif /* not defined CONFIG_S390 */ |
6aa8b732 | 757 | |
bc6678a3 MT |
758 | if (!npages) { |
759 | r = -ENOMEM; | |
760 | slots = kzalloc(sizeof(struct kvm_memslots), GFP_KERNEL); | |
761 | if (!slots) | |
762 | goto out_free; | |
763 | memcpy(slots, kvm->memslots, sizeof(struct kvm_memslots)); | |
764 | if (mem->slot >= slots->nmemslots) | |
765 | slots->nmemslots = mem->slot + 1; | |
49c7754c | 766 | slots->generation++; |
bc6678a3 MT |
767 | slots->memslots[mem->slot].flags |= KVM_MEMSLOT_INVALID; |
768 | ||
769 | old_memslots = kvm->memslots; | |
770 | rcu_assign_pointer(kvm->memslots, slots); | |
771 | synchronize_srcu_expedited(&kvm->srcu); | |
772 | /* From this point no new shadow pages pointing to a deleted | |
773 | * memslot will be created. | |
774 | * | |
775 | * validation of sp->gfn happens in: | |
776 | * - gfn_to_hva (kvm_read_guest, gfn_to_pfn) | |
777 | * - kvm_is_visible_gfn (mmu_check_roots) | |
778 | */ | |
34d4cb8f | 779 | kvm_arch_flush_shadow(kvm); |
bc6678a3 MT |
780 | kfree(old_memslots); |
781 | } | |
34d4cb8f | 782 | |
f7784b8e MT |
783 | r = kvm_arch_prepare_memory_region(kvm, &new, old, mem, user_alloc); |
784 | if (r) | |
785 | goto out_free; | |
786 | ||
bc6678a3 MT |
787 | /* map the pages in iommu page table */ |
788 | if (npages) { | |
789 | r = kvm_iommu_map_pages(kvm, &new); | |
790 | if (r) | |
791 | goto out_free; | |
792 | } | |
604b38ac | 793 | |
bc6678a3 MT |
794 | r = -ENOMEM; |
795 | slots = kzalloc(sizeof(struct kvm_memslots), GFP_KERNEL); | |
796 | if (!slots) | |
797 | goto out_free; | |
798 | memcpy(slots, kvm->memslots, sizeof(struct kvm_memslots)); | |
799 | if (mem->slot >= slots->nmemslots) | |
800 | slots->nmemslots = mem->slot + 1; | |
49c7754c | 801 | slots->generation++; |
bc6678a3 MT |
802 | |
803 | /* actual memory is freed via old in kvm_free_physmem_slot below */ | |
804 | if (!npages) { | |
805 | new.rmap = NULL; | |
806 | new.dirty_bitmap = NULL; | |
807 | for (i = 0; i < KVM_NR_PAGE_SIZES - 1; ++i) | |
808 | new.lpage_info[i] = NULL; | |
809 | } | |
810 | ||
811 | slots->memslots[mem->slot] = new; | |
812 | old_memslots = kvm->memslots; | |
813 | rcu_assign_pointer(kvm->memslots, slots); | |
814 | synchronize_srcu_expedited(&kvm->srcu); | |
3ad82a7e | 815 | |
f7784b8e | 816 | kvm_arch_commit_memory_region(kvm, mem, old, user_alloc); |
82ce2c96 | 817 | |
bc6678a3 MT |
818 | kvm_free_physmem_slot(&old, &new); |
819 | kfree(old_memslots); | |
820 | ||
6aa8b732 AK |
821 | return 0; |
822 | ||
f78e0e2e | 823 | out_free: |
6aa8b732 AK |
824 | kvm_free_physmem_slot(&new, &old); |
825 | out: | |
826 | return r; | |
210c7c4d IE |
827 | |
828 | } | |
f78e0e2e SY |
829 | EXPORT_SYMBOL_GPL(__kvm_set_memory_region); |
830 | ||
831 | int kvm_set_memory_region(struct kvm *kvm, | |
832 | struct kvm_userspace_memory_region *mem, | |
833 | int user_alloc) | |
834 | { | |
835 | int r; | |
836 | ||
79fac95e | 837 | mutex_lock(&kvm->slots_lock); |
f78e0e2e | 838 | r = __kvm_set_memory_region(kvm, mem, user_alloc); |
79fac95e | 839 | mutex_unlock(&kvm->slots_lock); |
f78e0e2e SY |
840 | return r; |
841 | } | |
210c7c4d IE |
842 | EXPORT_SYMBOL_GPL(kvm_set_memory_region); |
843 | ||
1fe779f8 CO |
844 | int kvm_vm_ioctl_set_memory_region(struct kvm *kvm, |
845 | struct | |
846 | kvm_userspace_memory_region *mem, | |
847 | int user_alloc) | |
210c7c4d | 848 | { |
e0d62c7f IE |
849 | if (mem->slot >= KVM_MEMORY_SLOTS) |
850 | return -EINVAL; | |
210c7c4d | 851 | return kvm_set_memory_region(kvm, mem, user_alloc); |
6aa8b732 AK |
852 | } |
853 | ||
5bb064dc ZX |
854 | int kvm_get_dirty_log(struct kvm *kvm, |
855 | struct kvm_dirty_log *log, int *is_dirty) | |
6aa8b732 AK |
856 | { |
857 | struct kvm_memory_slot *memslot; | |
858 | int r, i; | |
87bf6e7d | 859 | unsigned long n; |
6aa8b732 AK |
860 | unsigned long any = 0; |
861 | ||
6aa8b732 AK |
862 | r = -EINVAL; |
863 | if (log->slot >= KVM_MEMORY_SLOTS) | |
864 | goto out; | |
865 | ||
46a26bf5 | 866 | memslot = &kvm->memslots->memslots[log->slot]; |
6aa8b732 AK |
867 | r = -ENOENT; |
868 | if (!memslot->dirty_bitmap) | |
869 | goto out; | |
870 | ||
87bf6e7d | 871 | n = kvm_dirty_bitmap_bytes(memslot); |
6aa8b732 | 872 | |
cd1a4a98 | 873 | for (i = 0; !any && i < n/sizeof(long); ++i) |
6aa8b732 AK |
874 | any = memslot->dirty_bitmap[i]; |
875 | ||
876 | r = -EFAULT; | |
877 | if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n)) | |
878 | goto out; | |
879 | ||
5bb064dc ZX |
880 | if (any) |
881 | *is_dirty = 1; | |
6aa8b732 AK |
882 | |
883 | r = 0; | |
6aa8b732 | 884 | out: |
6aa8b732 AK |
885 | return r; |
886 | } | |
887 | ||
54dee993 MT |
888 | void kvm_disable_largepages(void) |
889 | { | |
890 | largepages_enabled = false; | |
891 | } | |
892 | EXPORT_SYMBOL_GPL(kvm_disable_largepages); | |
893 | ||
cea7bb21 IE |
894 | int is_error_page(struct page *page) |
895 | { | |
edba23e5 | 896 | return page == bad_page || page == hwpoison_page || page == fault_page; |
cea7bb21 IE |
897 | } |
898 | EXPORT_SYMBOL_GPL(is_error_page); | |
899 | ||
35149e21 AL |
900 | int is_error_pfn(pfn_t pfn) |
901 | { | |
edba23e5 | 902 | return pfn == bad_pfn || pfn == hwpoison_pfn || pfn == fault_pfn; |
35149e21 AL |
903 | } |
904 | EXPORT_SYMBOL_GPL(is_error_pfn); | |
905 | ||
bf998156 HY |
906 | int is_hwpoison_pfn(pfn_t pfn) |
907 | { | |
908 | return pfn == hwpoison_pfn; | |
909 | } | |
910 | EXPORT_SYMBOL_GPL(is_hwpoison_pfn); | |
911 | ||
edba23e5 GN |
912 | int is_fault_pfn(pfn_t pfn) |
913 | { | |
914 | return pfn == fault_pfn; | |
915 | } | |
916 | EXPORT_SYMBOL_GPL(is_fault_pfn); | |
917 | ||
f9d46eb0 IE |
918 | static inline unsigned long bad_hva(void) |
919 | { | |
920 | return PAGE_OFFSET; | |
921 | } | |
922 | ||
923 | int kvm_is_error_hva(unsigned long addr) | |
924 | { | |
925 | return addr == bad_hva(); | |
926 | } | |
927 | EXPORT_SYMBOL_GPL(kvm_is_error_hva); | |
928 | ||
49c7754c GN |
929 | static struct kvm_memory_slot *__gfn_to_memslot(struct kvm_memslots *slots, |
930 | gfn_t gfn) | |
6aa8b732 AK |
931 | { |
932 | int i; | |
933 | ||
46a26bf5 MT |
934 | for (i = 0; i < slots->nmemslots; ++i) { |
935 | struct kvm_memory_slot *memslot = &slots->memslots[i]; | |
6aa8b732 AK |
936 | |
937 | if (gfn >= memslot->base_gfn | |
938 | && gfn < memslot->base_gfn + memslot->npages) | |
939 | return memslot; | |
940 | } | |
8b6d44c7 | 941 | return NULL; |
6aa8b732 | 942 | } |
49c7754c GN |
943 | |
944 | struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn) | |
945 | { | |
946 | return __gfn_to_memslot(kvm_memslots(kvm), gfn); | |
947 | } | |
a1f4d395 | 948 | EXPORT_SYMBOL_GPL(gfn_to_memslot); |
6aa8b732 | 949 | |
e0d62c7f IE |
950 | int kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn) |
951 | { | |
952 | int i; | |
90d83dc3 | 953 | struct kvm_memslots *slots = kvm_memslots(kvm); |
e0d62c7f | 954 | |
e0d62c7f | 955 | for (i = 0; i < KVM_MEMORY_SLOTS; ++i) { |
46a26bf5 | 956 | struct kvm_memory_slot *memslot = &slots->memslots[i]; |
e0d62c7f | 957 | |
bc6678a3 MT |
958 | if (memslot->flags & KVM_MEMSLOT_INVALID) |
959 | continue; | |
960 | ||
e0d62c7f IE |
961 | if (gfn >= memslot->base_gfn |
962 | && gfn < memslot->base_gfn + memslot->npages) | |
963 | return 1; | |
964 | } | |
965 | return 0; | |
966 | } | |
967 | EXPORT_SYMBOL_GPL(kvm_is_visible_gfn); | |
968 | ||
8f0b1ab6 JR |
969 | unsigned long kvm_host_page_size(struct kvm *kvm, gfn_t gfn) |
970 | { | |
971 | struct vm_area_struct *vma; | |
972 | unsigned long addr, size; | |
973 | ||
974 | size = PAGE_SIZE; | |
975 | ||
976 | addr = gfn_to_hva(kvm, gfn); | |
977 | if (kvm_is_error_hva(addr)) | |
978 | return PAGE_SIZE; | |
979 | ||
980 | down_read(¤t->mm->mmap_sem); | |
981 | vma = find_vma(current->mm, addr); | |
982 | if (!vma) | |
983 | goto out; | |
984 | ||
985 | size = vma_kernel_pagesize(vma); | |
986 | ||
987 | out: | |
988 | up_read(¤t->mm->mmap_sem); | |
989 | ||
990 | return size; | |
991 | } | |
992 | ||
bc6678a3 MT |
993 | int memslot_id(struct kvm *kvm, gfn_t gfn) |
994 | { | |
995 | int i; | |
90d83dc3 | 996 | struct kvm_memslots *slots = kvm_memslots(kvm); |
bc6678a3 MT |
997 | struct kvm_memory_slot *memslot = NULL; |
998 | ||
bc6678a3 MT |
999 | for (i = 0; i < slots->nmemslots; ++i) { |
1000 | memslot = &slots->memslots[i]; | |
1001 | ||
1002 | if (gfn >= memslot->base_gfn | |
1003 | && gfn < memslot->base_gfn + memslot->npages) | |
1004 | break; | |
1005 | } | |
1006 | ||
1007 | return memslot - slots->memslots; | |
1008 | } | |
1009 | ||
49c7754c | 1010 | static unsigned long gfn_to_hva_many(struct kvm_memory_slot *slot, gfn_t gfn, |
48987781 | 1011 | gfn_t *nr_pages) |
539cb660 | 1012 | { |
bc6678a3 | 1013 | if (!slot || slot->flags & KVM_MEMSLOT_INVALID) |
539cb660 | 1014 | return bad_hva(); |
48987781 XG |
1015 | |
1016 | if (nr_pages) | |
1017 | *nr_pages = slot->npages - (gfn - slot->base_gfn); | |
1018 | ||
f5c98031 | 1019 | return gfn_to_hva_memslot(slot, gfn); |
539cb660 | 1020 | } |
48987781 XG |
1021 | |
1022 | unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn) | |
1023 | { | |
49c7754c | 1024 | return gfn_to_hva_many(gfn_to_memslot(kvm, gfn), gfn, NULL); |
48987781 | 1025 | } |
0d150298 | 1026 | EXPORT_SYMBOL_GPL(gfn_to_hva); |
539cb660 | 1027 | |
8030089f GN |
1028 | static pfn_t get_fault_pfn(void) |
1029 | { | |
1030 | get_page(fault_page); | |
1031 | return fault_pfn; | |
1032 | } | |
1033 | ||
af585b92 | 1034 | static pfn_t hva_to_pfn(struct kvm *kvm, unsigned long addr, bool atomic, |
612819c3 | 1035 | bool *async, bool write_fault, bool *writable) |
954bbbc2 | 1036 | { |
8d4e1288 | 1037 | struct page *page[1]; |
af585b92 | 1038 | int npages = 0; |
2e2e3738 | 1039 | pfn_t pfn; |
954bbbc2 | 1040 | |
af585b92 GN |
1041 | /* we can do it either atomically or asynchronously, not both */ |
1042 | BUG_ON(atomic && async); | |
1043 | ||
612819c3 MT |
1044 | BUG_ON(!write_fault && !writable); |
1045 | ||
1046 | if (writable) | |
1047 | *writable = true; | |
1048 | ||
af585b92 | 1049 | if (atomic || async) |
887c08ac | 1050 | npages = __get_user_pages_fast(addr, 1, 1, page); |
af585b92 GN |
1051 | |
1052 | if (unlikely(npages != 1) && !atomic) { | |
887c08ac | 1053 | might_sleep(); |
612819c3 MT |
1054 | |
1055 | if (writable) | |
1056 | *writable = write_fault; | |
1057 | ||
1058 | npages = get_user_pages_fast(addr, 1, write_fault, page); | |
1059 | ||
1060 | /* map read fault as writable if possible */ | |
1061 | if (unlikely(!write_fault) && npages == 1) { | |
1062 | struct page *wpage[1]; | |
1063 | ||
1064 | npages = __get_user_pages_fast(addr, 1, 1, wpage); | |
1065 | if (npages == 1) { | |
1066 | *writable = true; | |
1067 | put_page(page[0]); | |
1068 | page[0] = wpage[0]; | |
1069 | } | |
1070 | npages = 1; | |
1071 | } | |
887c08ac | 1072 | } |
539cb660 | 1073 | |
2e2e3738 AL |
1074 | if (unlikely(npages != 1)) { |
1075 | struct vm_area_struct *vma; | |
1076 | ||
887c08ac | 1077 | if (atomic) |
8030089f | 1078 | return get_fault_pfn(); |
887c08ac | 1079 | |
bbeb3406 | 1080 | down_read(¤t->mm->mmap_sem); |
bf998156 | 1081 | if (is_hwpoison_address(addr)) { |
bbeb3406 | 1082 | up_read(¤t->mm->mmap_sem); |
bf998156 HY |
1083 | get_page(hwpoison_page); |
1084 | return page_to_pfn(hwpoison_page); | |
1085 | } | |
1086 | ||
8030089f | 1087 | vma = find_vma_intersection(current->mm, addr, addr+1); |
4c2155ce | 1088 | |
8030089f GN |
1089 | if (vma == NULL) |
1090 | pfn = get_fault_pfn(); | |
1091 | else if ((vma->vm_flags & VM_PFNMAP)) { | |
1092 | pfn = ((addr - vma->vm_start) >> PAGE_SHIFT) + | |
1093 | vma->vm_pgoff; | |
1094 | BUG_ON(!kvm_is_mmio_pfn(pfn)); | |
1095 | } else { | |
1096 | if (async && (vma->vm_flags & VM_WRITE)) | |
af585b92 | 1097 | *async = true; |
8030089f | 1098 | pfn = get_fault_pfn(); |
2e2e3738 | 1099 | } |
4c2155ce | 1100 | up_read(¤t->mm->mmap_sem); |
2e2e3738 AL |
1101 | } else |
1102 | pfn = page_to_pfn(page[0]); | |
8d4e1288 | 1103 | |
2e2e3738 | 1104 | return pfn; |
35149e21 AL |
1105 | } |
1106 | ||
887c08ac XG |
1107 | pfn_t hva_to_pfn_atomic(struct kvm *kvm, unsigned long addr) |
1108 | { | |
612819c3 | 1109 | return hva_to_pfn(kvm, addr, true, NULL, true, NULL); |
887c08ac XG |
1110 | } |
1111 | EXPORT_SYMBOL_GPL(hva_to_pfn_atomic); | |
1112 | ||
612819c3 MT |
1113 | static pfn_t __gfn_to_pfn(struct kvm *kvm, gfn_t gfn, bool atomic, bool *async, |
1114 | bool write_fault, bool *writable) | |
506f0d6f MT |
1115 | { |
1116 | unsigned long addr; | |
1117 | ||
af585b92 GN |
1118 | if (async) |
1119 | *async = false; | |
1120 | ||
506f0d6f MT |
1121 | addr = gfn_to_hva(kvm, gfn); |
1122 | if (kvm_is_error_hva(addr)) { | |
1123 | get_page(bad_page); | |
1124 | return page_to_pfn(bad_page); | |
1125 | } | |
1126 | ||
612819c3 | 1127 | return hva_to_pfn(kvm, addr, atomic, async, write_fault, writable); |
365fb3fd XG |
1128 | } |
1129 | ||
1130 | pfn_t gfn_to_pfn_atomic(struct kvm *kvm, gfn_t gfn) | |
1131 | { | |
612819c3 | 1132 | return __gfn_to_pfn(kvm, gfn, true, NULL, true, NULL); |
365fb3fd XG |
1133 | } |
1134 | EXPORT_SYMBOL_GPL(gfn_to_pfn_atomic); | |
1135 | ||
612819c3 MT |
1136 | pfn_t gfn_to_pfn_async(struct kvm *kvm, gfn_t gfn, bool *async, |
1137 | bool write_fault, bool *writable) | |
af585b92 | 1138 | { |
612819c3 | 1139 | return __gfn_to_pfn(kvm, gfn, false, async, write_fault, writable); |
af585b92 GN |
1140 | } |
1141 | EXPORT_SYMBOL_GPL(gfn_to_pfn_async); | |
1142 | ||
365fb3fd XG |
1143 | pfn_t gfn_to_pfn(struct kvm *kvm, gfn_t gfn) |
1144 | { | |
612819c3 | 1145 | return __gfn_to_pfn(kvm, gfn, false, NULL, true, NULL); |
506f0d6f | 1146 | } |
35149e21 AL |
1147 | EXPORT_SYMBOL_GPL(gfn_to_pfn); |
1148 | ||
612819c3 MT |
1149 | pfn_t gfn_to_pfn_prot(struct kvm *kvm, gfn_t gfn, bool write_fault, |
1150 | bool *writable) | |
1151 | { | |
1152 | return __gfn_to_pfn(kvm, gfn, false, NULL, write_fault, writable); | |
1153 | } | |
1154 | EXPORT_SYMBOL_GPL(gfn_to_pfn_prot); | |
1155 | ||
506f0d6f MT |
1156 | pfn_t gfn_to_pfn_memslot(struct kvm *kvm, |
1157 | struct kvm_memory_slot *slot, gfn_t gfn) | |
1158 | { | |
1159 | unsigned long addr = gfn_to_hva_memslot(slot, gfn); | |
612819c3 | 1160 | return hva_to_pfn(kvm, addr, false, NULL, true, NULL); |
506f0d6f MT |
1161 | } |
1162 | ||
48987781 XG |
1163 | int gfn_to_page_many_atomic(struct kvm *kvm, gfn_t gfn, struct page **pages, |
1164 | int nr_pages) | |
1165 | { | |
1166 | unsigned long addr; | |
1167 | gfn_t entry; | |
1168 | ||
49c7754c | 1169 | addr = gfn_to_hva_many(gfn_to_memslot(kvm, gfn), gfn, &entry); |
48987781 XG |
1170 | if (kvm_is_error_hva(addr)) |
1171 | return -1; | |
1172 | ||
1173 | if (entry < nr_pages) | |
1174 | return 0; | |
1175 | ||
1176 | return __get_user_pages_fast(addr, nr_pages, 1, pages); | |
1177 | } | |
1178 | EXPORT_SYMBOL_GPL(gfn_to_page_many_atomic); | |
1179 | ||
35149e21 AL |
1180 | struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn) |
1181 | { | |
2e2e3738 AL |
1182 | pfn_t pfn; |
1183 | ||
1184 | pfn = gfn_to_pfn(kvm, gfn); | |
c77fb9dc | 1185 | if (!kvm_is_mmio_pfn(pfn)) |
2e2e3738 AL |
1186 | return pfn_to_page(pfn); |
1187 | ||
c77fb9dc | 1188 | WARN_ON(kvm_is_mmio_pfn(pfn)); |
2e2e3738 AL |
1189 | |
1190 | get_page(bad_page); | |
1191 | return bad_page; | |
954bbbc2 | 1192 | } |
aab61cc0 | 1193 | |
954bbbc2 AK |
1194 | EXPORT_SYMBOL_GPL(gfn_to_page); |
1195 | ||
b4231d61 IE |
1196 | void kvm_release_page_clean(struct page *page) |
1197 | { | |
35149e21 | 1198 | kvm_release_pfn_clean(page_to_pfn(page)); |
b4231d61 IE |
1199 | } |
1200 | EXPORT_SYMBOL_GPL(kvm_release_page_clean); | |
1201 | ||
35149e21 AL |
1202 | void kvm_release_pfn_clean(pfn_t pfn) |
1203 | { | |
c77fb9dc | 1204 | if (!kvm_is_mmio_pfn(pfn)) |
2e2e3738 | 1205 | put_page(pfn_to_page(pfn)); |
35149e21 AL |
1206 | } |
1207 | EXPORT_SYMBOL_GPL(kvm_release_pfn_clean); | |
1208 | ||
b4231d61 | 1209 | void kvm_release_page_dirty(struct page *page) |
8a7ae055 | 1210 | { |
35149e21 AL |
1211 | kvm_release_pfn_dirty(page_to_pfn(page)); |
1212 | } | |
1213 | EXPORT_SYMBOL_GPL(kvm_release_page_dirty); | |
1214 | ||
1215 | void kvm_release_pfn_dirty(pfn_t pfn) | |
1216 | { | |
1217 | kvm_set_pfn_dirty(pfn); | |
1218 | kvm_release_pfn_clean(pfn); | |
1219 | } | |
1220 | EXPORT_SYMBOL_GPL(kvm_release_pfn_dirty); | |
1221 | ||
1222 | void kvm_set_page_dirty(struct page *page) | |
1223 | { | |
1224 | kvm_set_pfn_dirty(page_to_pfn(page)); | |
1225 | } | |
1226 | EXPORT_SYMBOL_GPL(kvm_set_page_dirty); | |
1227 | ||
1228 | void kvm_set_pfn_dirty(pfn_t pfn) | |
1229 | { | |
c77fb9dc | 1230 | if (!kvm_is_mmio_pfn(pfn)) { |
2e2e3738 AL |
1231 | struct page *page = pfn_to_page(pfn); |
1232 | if (!PageReserved(page)) | |
1233 | SetPageDirty(page); | |
1234 | } | |
8a7ae055 | 1235 | } |
35149e21 AL |
1236 | EXPORT_SYMBOL_GPL(kvm_set_pfn_dirty); |
1237 | ||
1238 | void kvm_set_pfn_accessed(pfn_t pfn) | |
1239 | { | |
c77fb9dc | 1240 | if (!kvm_is_mmio_pfn(pfn)) |
2e2e3738 | 1241 | mark_page_accessed(pfn_to_page(pfn)); |
35149e21 AL |
1242 | } |
1243 | EXPORT_SYMBOL_GPL(kvm_set_pfn_accessed); | |
1244 | ||
1245 | void kvm_get_pfn(pfn_t pfn) | |
1246 | { | |
c77fb9dc | 1247 | if (!kvm_is_mmio_pfn(pfn)) |
2e2e3738 | 1248 | get_page(pfn_to_page(pfn)); |
35149e21 AL |
1249 | } |
1250 | EXPORT_SYMBOL_GPL(kvm_get_pfn); | |
8a7ae055 | 1251 | |
195aefde IE |
1252 | static int next_segment(unsigned long len, int offset) |
1253 | { | |
1254 | if (len > PAGE_SIZE - offset) | |
1255 | return PAGE_SIZE - offset; | |
1256 | else | |
1257 | return len; | |
1258 | } | |
1259 | ||
1260 | int kvm_read_guest_page(struct kvm *kvm, gfn_t gfn, void *data, int offset, | |
1261 | int len) | |
1262 | { | |
e0506bcb IE |
1263 | int r; |
1264 | unsigned long addr; | |
195aefde | 1265 | |
e0506bcb IE |
1266 | addr = gfn_to_hva(kvm, gfn); |
1267 | if (kvm_is_error_hva(addr)) | |
1268 | return -EFAULT; | |
1269 | r = copy_from_user(data, (void __user *)addr + offset, len); | |
1270 | if (r) | |
195aefde | 1271 | return -EFAULT; |
195aefde IE |
1272 | return 0; |
1273 | } | |
1274 | EXPORT_SYMBOL_GPL(kvm_read_guest_page); | |
1275 | ||
1276 | int kvm_read_guest(struct kvm *kvm, gpa_t gpa, void *data, unsigned long len) | |
1277 | { | |
1278 | gfn_t gfn = gpa >> PAGE_SHIFT; | |
1279 | int seg; | |
1280 | int offset = offset_in_page(gpa); | |
1281 | int ret; | |
1282 | ||
1283 | while ((seg = next_segment(len, offset)) != 0) { | |
1284 | ret = kvm_read_guest_page(kvm, gfn, data, offset, seg); | |
1285 | if (ret < 0) | |
1286 | return ret; | |
1287 | offset = 0; | |
1288 | len -= seg; | |
1289 | data += seg; | |
1290 | ++gfn; | |
1291 | } | |
1292 | return 0; | |
1293 | } | |
1294 | EXPORT_SYMBOL_GPL(kvm_read_guest); | |
1295 | ||
7ec54588 MT |
1296 | int kvm_read_guest_atomic(struct kvm *kvm, gpa_t gpa, void *data, |
1297 | unsigned long len) | |
1298 | { | |
1299 | int r; | |
1300 | unsigned long addr; | |
1301 | gfn_t gfn = gpa >> PAGE_SHIFT; | |
1302 | int offset = offset_in_page(gpa); | |
1303 | ||
1304 | addr = gfn_to_hva(kvm, gfn); | |
1305 | if (kvm_is_error_hva(addr)) | |
1306 | return -EFAULT; | |
0aac03f0 | 1307 | pagefault_disable(); |
7ec54588 | 1308 | r = __copy_from_user_inatomic(data, (void __user *)addr + offset, len); |
0aac03f0 | 1309 | pagefault_enable(); |
7ec54588 MT |
1310 | if (r) |
1311 | return -EFAULT; | |
1312 | return 0; | |
1313 | } | |
1314 | EXPORT_SYMBOL(kvm_read_guest_atomic); | |
1315 | ||
195aefde IE |
1316 | int kvm_write_guest_page(struct kvm *kvm, gfn_t gfn, const void *data, |
1317 | int offset, int len) | |
1318 | { | |
e0506bcb IE |
1319 | int r; |
1320 | unsigned long addr; | |
195aefde | 1321 | |
e0506bcb IE |
1322 | addr = gfn_to_hva(kvm, gfn); |
1323 | if (kvm_is_error_hva(addr)) | |
1324 | return -EFAULT; | |
1325 | r = copy_to_user((void __user *)addr + offset, data, len); | |
1326 | if (r) | |
195aefde | 1327 | return -EFAULT; |
195aefde IE |
1328 | mark_page_dirty(kvm, gfn); |
1329 | return 0; | |
1330 | } | |
1331 | EXPORT_SYMBOL_GPL(kvm_write_guest_page); | |
1332 | ||
1333 | int kvm_write_guest(struct kvm *kvm, gpa_t gpa, const void *data, | |
1334 | unsigned long len) | |
1335 | { | |
1336 | gfn_t gfn = gpa >> PAGE_SHIFT; | |
1337 | int seg; | |
1338 | int offset = offset_in_page(gpa); | |
1339 | int ret; | |
1340 | ||
1341 | while ((seg = next_segment(len, offset)) != 0) { | |
1342 | ret = kvm_write_guest_page(kvm, gfn, data, offset, seg); | |
1343 | if (ret < 0) | |
1344 | return ret; | |
1345 | offset = 0; | |
1346 | len -= seg; | |
1347 | data += seg; | |
1348 | ++gfn; | |
1349 | } | |
1350 | return 0; | |
1351 | } | |
1352 | ||
49c7754c GN |
1353 | int kvm_gfn_to_hva_cache_init(struct kvm *kvm, struct gfn_to_hva_cache *ghc, |
1354 | gpa_t gpa) | |
1355 | { | |
1356 | struct kvm_memslots *slots = kvm_memslots(kvm); | |
1357 | int offset = offset_in_page(gpa); | |
1358 | gfn_t gfn = gpa >> PAGE_SHIFT; | |
1359 | ||
1360 | ghc->gpa = gpa; | |
1361 | ghc->generation = slots->generation; | |
1362 | ghc->memslot = __gfn_to_memslot(slots, gfn); | |
1363 | ghc->hva = gfn_to_hva_many(ghc->memslot, gfn, NULL); | |
1364 | if (!kvm_is_error_hva(ghc->hva)) | |
1365 | ghc->hva += offset; | |
1366 | else | |
1367 | return -EFAULT; | |
1368 | ||
1369 | return 0; | |
1370 | } | |
1371 | EXPORT_SYMBOL_GPL(kvm_gfn_to_hva_cache_init); | |
1372 | ||
1373 | int kvm_write_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc, | |
1374 | void *data, unsigned long len) | |
1375 | { | |
1376 | struct kvm_memslots *slots = kvm_memslots(kvm); | |
1377 | int r; | |
1378 | ||
1379 | if (slots->generation != ghc->generation) | |
1380 | kvm_gfn_to_hva_cache_init(kvm, ghc, ghc->gpa); | |
1381 | ||
1382 | if (kvm_is_error_hva(ghc->hva)) | |
1383 | return -EFAULT; | |
1384 | ||
1385 | r = copy_to_user((void __user *)ghc->hva, data, len); | |
1386 | if (r) | |
1387 | return -EFAULT; | |
1388 | mark_page_dirty_in_slot(kvm, ghc->memslot, ghc->gpa >> PAGE_SHIFT); | |
1389 | ||
1390 | return 0; | |
1391 | } | |
1392 | EXPORT_SYMBOL_GPL(kvm_write_guest_cached); | |
1393 | ||
195aefde IE |
1394 | int kvm_clear_guest_page(struct kvm *kvm, gfn_t gfn, int offset, int len) |
1395 | { | |
3bcc8a8c HC |
1396 | return kvm_write_guest_page(kvm, gfn, (const void *) empty_zero_page, |
1397 | offset, len); | |
195aefde IE |
1398 | } |
1399 | EXPORT_SYMBOL_GPL(kvm_clear_guest_page); | |
1400 | ||
1401 | int kvm_clear_guest(struct kvm *kvm, gpa_t gpa, unsigned long len) | |
1402 | { | |
1403 | gfn_t gfn = gpa >> PAGE_SHIFT; | |
1404 | int seg; | |
1405 | int offset = offset_in_page(gpa); | |
1406 | int ret; | |
1407 | ||
1408 | while ((seg = next_segment(len, offset)) != 0) { | |
1409 | ret = kvm_clear_guest_page(kvm, gfn, offset, seg); | |
1410 | if (ret < 0) | |
1411 | return ret; | |
1412 | offset = 0; | |
1413 | len -= seg; | |
1414 | ++gfn; | |
1415 | } | |
1416 | return 0; | |
1417 | } | |
1418 | EXPORT_SYMBOL_GPL(kvm_clear_guest); | |
1419 | ||
49c7754c GN |
1420 | void mark_page_dirty_in_slot(struct kvm *kvm, struct kvm_memory_slot *memslot, |
1421 | gfn_t gfn) | |
6aa8b732 | 1422 | { |
7e9d619d RR |
1423 | if (memslot && memslot->dirty_bitmap) { |
1424 | unsigned long rel_gfn = gfn - memslot->base_gfn; | |
6aa8b732 | 1425 | |
d1476937 | 1426 | generic___set_le_bit(rel_gfn, memslot->dirty_bitmap); |
6aa8b732 AK |
1427 | } |
1428 | } | |
1429 | ||
49c7754c GN |
1430 | void mark_page_dirty(struct kvm *kvm, gfn_t gfn) |
1431 | { | |
1432 | struct kvm_memory_slot *memslot; | |
1433 | ||
1434 | memslot = gfn_to_memslot(kvm, gfn); | |
1435 | mark_page_dirty_in_slot(kvm, memslot, gfn); | |
1436 | } | |
1437 | ||
b6958ce4 ED |
1438 | /* |
1439 | * The vCPU has executed a HLT instruction with in-kernel mode enabled. | |
1440 | */ | |
8776e519 | 1441 | void kvm_vcpu_block(struct kvm_vcpu *vcpu) |
d3bef15f | 1442 | { |
e5c239cf MT |
1443 | DEFINE_WAIT(wait); |
1444 | ||
1445 | for (;;) { | |
1446 | prepare_to_wait(&vcpu->wq, &wait, TASK_INTERRUPTIBLE); | |
1447 | ||
a1b37100 | 1448 | if (kvm_arch_vcpu_runnable(vcpu)) { |
a8eeb04a | 1449 | kvm_make_request(KVM_REQ_UNHALT, vcpu); |
e5c239cf | 1450 | break; |
d7690175 | 1451 | } |
09cec754 GN |
1452 | if (kvm_cpu_has_pending_timer(vcpu)) |
1453 | break; | |
e5c239cf MT |
1454 | if (signal_pending(current)) |
1455 | break; | |
1456 | ||
b6958ce4 | 1457 | schedule(); |
b6958ce4 | 1458 | } |
d3bef15f | 1459 | |
e5c239cf | 1460 | finish_wait(&vcpu->wq, &wait); |
b6958ce4 ED |
1461 | } |
1462 | ||
6aa8b732 AK |
1463 | void kvm_resched(struct kvm_vcpu *vcpu) |
1464 | { | |
3fca0365 YD |
1465 | if (!need_resched()) |
1466 | return; | |
6aa8b732 | 1467 | cond_resched(); |
6aa8b732 AK |
1468 | } |
1469 | EXPORT_SYMBOL_GPL(kvm_resched); | |
1470 | ||
d255f4f2 ZE |
1471 | void kvm_vcpu_on_spin(struct kvm_vcpu *vcpu) |
1472 | { | |
1473 | ktime_t expires; | |
1474 | DEFINE_WAIT(wait); | |
1475 | ||
1476 | prepare_to_wait(&vcpu->wq, &wait, TASK_INTERRUPTIBLE); | |
1477 | ||
1478 | /* Sleep for 100 us, and hope lock-holder got scheduled */ | |
1479 | expires = ktime_add_ns(ktime_get(), 100000UL); | |
1480 | schedule_hrtimeout(&expires, HRTIMER_MODE_ABS); | |
1481 | ||
1482 | finish_wait(&vcpu->wq, &wait); | |
1483 | } | |
1484 | EXPORT_SYMBOL_GPL(kvm_vcpu_on_spin); | |
1485 | ||
e4a533a4 | 1486 | static int kvm_vcpu_fault(struct vm_area_struct *vma, struct vm_fault *vmf) |
9a2bb7f4 AK |
1487 | { |
1488 | struct kvm_vcpu *vcpu = vma->vm_file->private_data; | |
9a2bb7f4 AK |
1489 | struct page *page; |
1490 | ||
e4a533a4 | 1491 | if (vmf->pgoff == 0) |
039576c0 | 1492 | page = virt_to_page(vcpu->run); |
09566765 | 1493 | #ifdef CONFIG_X86 |
e4a533a4 | 1494 | else if (vmf->pgoff == KVM_PIO_PAGE_OFFSET) |
ad312c7c | 1495 | page = virt_to_page(vcpu->arch.pio_data); |
5f94c174 LV |
1496 | #endif |
1497 | #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET | |
1498 | else if (vmf->pgoff == KVM_COALESCED_MMIO_PAGE_OFFSET) | |
1499 | page = virt_to_page(vcpu->kvm->coalesced_mmio_ring); | |
09566765 | 1500 | #endif |
039576c0 | 1501 | else |
e4a533a4 | 1502 | return VM_FAULT_SIGBUS; |
9a2bb7f4 | 1503 | get_page(page); |
e4a533a4 | 1504 | vmf->page = page; |
1505 | return 0; | |
9a2bb7f4 AK |
1506 | } |
1507 | ||
f0f37e2f | 1508 | static const struct vm_operations_struct kvm_vcpu_vm_ops = { |
e4a533a4 | 1509 | .fault = kvm_vcpu_fault, |
9a2bb7f4 AK |
1510 | }; |
1511 | ||
1512 | static int kvm_vcpu_mmap(struct file *file, struct vm_area_struct *vma) | |
1513 | { | |
1514 | vma->vm_ops = &kvm_vcpu_vm_ops; | |
1515 | return 0; | |
1516 | } | |
1517 | ||
bccf2150 AK |
1518 | static int kvm_vcpu_release(struct inode *inode, struct file *filp) |
1519 | { | |
1520 | struct kvm_vcpu *vcpu = filp->private_data; | |
1521 | ||
66c0b394 | 1522 | kvm_put_kvm(vcpu->kvm); |
bccf2150 AK |
1523 | return 0; |
1524 | } | |
1525 | ||
3d3aab1b | 1526 | static struct file_operations kvm_vcpu_fops = { |
bccf2150 AK |
1527 | .release = kvm_vcpu_release, |
1528 | .unlocked_ioctl = kvm_vcpu_ioctl, | |
1529 | .compat_ioctl = kvm_vcpu_ioctl, | |
9a2bb7f4 | 1530 | .mmap = kvm_vcpu_mmap, |
6038f373 | 1531 | .llseek = noop_llseek, |
bccf2150 AK |
1532 | }; |
1533 | ||
1534 | /* | |
1535 | * Allocates an inode for the vcpu. | |
1536 | */ | |
1537 | static int create_vcpu_fd(struct kvm_vcpu *vcpu) | |
1538 | { | |
628ff7c1 | 1539 | return anon_inode_getfd("kvm-vcpu", &kvm_vcpu_fops, vcpu, O_RDWR); |
bccf2150 AK |
1540 | } |
1541 | ||
c5ea7660 AK |
1542 | /* |
1543 | * Creates some virtual cpus. Good luck creating more than one. | |
1544 | */ | |
73880c80 | 1545 | static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, u32 id) |
c5ea7660 AK |
1546 | { |
1547 | int r; | |
988a2cae | 1548 | struct kvm_vcpu *vcpu, *v; |
c5ea7660 | 1549 | |
73880c80 | 1550 | vcpu = kvm_arch_vcpu_create(kvm, id); |
fb3f0f51 RR |
1551 | if (IS_ERR(vcpu)) |
1552 | return PTR_ERR(vcpu); | |
c5ea7660 | 1553 | |
15ad7146 AK |
1554 | preempt_notifier_init(&vcpu->preempt_notifier, &kvm_preempt_ops); |
1555 | ||
26e5215f AK |
1556 | r = kvm_arch_vcpu_setup(vcpu); |
1557 | if (r) | |
7d8fece6 | 1558 | return r; |
26e5215f | 1559 | |
11ec2804 | 1560 | mutex_lock(&kvm->lock); |
73880c80 GN |
1561 | if (atomic_read(&kvm->online_vcpus) == KVM_MAX_VCPUS) { |
1562 | r = -EINVAL; | |
e9b11c17 | 1563 | goto vcpu_destroy; |
fb3f0f51 | 1564 | } |
73880c80 | 1565 | |
988a2cae GN |
1566 | kvm_for_each_vcpu(r, v, kvm) |
1567 | if (v->vcpu_id == id) { | |
73880c80 GN |
1568 | r = -EEXIST; |
1569 | goto vcpu_destroy; | |
1570 | } | |
1571 | ||
1572 | BUG_ON(kvm->vcpus[atomic_read(&kvm->online_vcpus)]); | |
c5ea7660 | 1573 | |
fb3f0f51 | 1574 | /* Now it's all set up, let userspace reach it */ |
66c0b394 | 1575 | kvm_get_kvm(kvm); |
bccf2150 | 1576 | r = create_vcpu_fd(vcpu); |
73880c80 GN |
1577 | if (r < 0) { |
1578 | kvm_put_kvm(kvm); | |
1579 | goto vcpu_destroy; | |
1580 | } | |
1581 | ||
1582 | kvm->vcpus[atomic_read(&kvm->online_vcpus)] = vcpu; | |
1583 | smp_wmb(); | |
1584 | atomic_inc(&kvm->online_vcpus); | |
1585 | ||
1586 | #ifdef CONFIG_KVM_APIC_ARCHITECTURE | |
1587 | if (kvm->bsp_vcpu_id == id) | |
1588 | kvm->bsp_vcpu = vcpu; | |
1589 | #endif | |
1590 | mutex_unlock(&kvm->lock); | |
fb3f0f51 | 1591 | return r; |
39c3b86e | 1592 | |
e9b11c17 | 1593 | vcpu_destroy: |
7d8fece6 | 1594 | mutex_unlock(&kvm->lock); |
d40ccc62 | 1595 | kvm_arch_vcpu_destroy(vcpu); |
c5ea7660 AK |
1596 | return r; |
1597 | } | |
1598 | ||
1961d276 AK |
1599 | static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu *vcpu, sigset_t *sigset) |
1600 | { | |
1601 | if (sigset) { | |
1602 | sigdelsetmask(sigset, sigmask(SIGKILL)|sigmask(SIGSTOP)); | |
1603 | vcpu->sigset_active = 1; | |
1604 | vcpu->sigset = *sigset; | |
1605 | } else | |
1606 | vcpu->sigset_active = 0; | |
1607 | return 0; | |
1608 | } | |
1609 | ||
bccf2150 AK |
1610 | static long kvm_vcpu_ioctl(struct file *filp, |
1611 | unsigned int ioctl, unsigned long arg) | |
6aa8b732 | 1612 | { |
bccf2150 | 1613 | struct kvm_vcpu *vcpu = filp->private_data; |
2f366987 | 1614 | void __user *argp = (void __user *)arg; |
313a3dc7 | 1615 | int r; |
fa3795a7 DH |
1616 | struct kvm_fpu *fpu = NULL; |
1617 | struct kvm_sregs *kvm_sregs = NULL; | |
6aa8b732 | 1618 | |
6d4e4c4f AK |
1619 | if (vcpu->kvm->mm != current->mm) |
1620 | return -EIO; | |
2122ff5e AK |
1621 | |
1622 | #if defined(CONFIG_S390) || defined(CONFIG_PPC) | |
1623 | /* | |
1624 | * Special cases: vcpu ioctls that are asynchronous to vcpu execution, | |
1625 | * so vcpu_load() would break it. | |
1626 | */ | |
1627 | if (ioctl == KVM_S390_INTERRUPT || ioctl == KVM_INTERRUPT) | |
1628 | return kvm_arch_vcpu_ioctl(filp, ioctl, arg); | |
1629 | #endif | |
1630 | ||
1631 | ||
1632 | vcpu_load(vcpu); | |
6aa8b732 | 1633 | switch (ioctl) { |
9a2bb7f4 | 1634 | case KVM_RUN: |
f0fe5108 AK |
1635 | r = -EINVAL; |
1636 | if (arg) | |
1637 | goto out; | |
b6c7a5dc | 1638 | r = kvm_arch_vcpu_ioctl_run(vcpu, vcpu->run); |
64be5007 | 1639 | trace_kvm_userspace_exit(vcpu->run->exit_reason, r); |
6aa8b732 | 1640 | break; |
6aa8b732 | 1641 | case KVM_GET_REGS: { |
3e4bb3ac | 1642 | struct kvm_regs *kvm_regs; |
6aa8b732 | 1643 | |
3e4bb3ac XZ |
1644 | r = -ENOMEM; |
1645 | kvm_regs = kzalloc(sizeof(struct kvm_regs), GFP_KERNEL); | |
1646 | if (!kvm_regs) | |
6aa8b732 | 1647 | goto out; |
3e4bb3ac XZ |
1648 | r = kvm_arch_vcpu_ioctl_get_regs(vcpu, kvm_regs); |
1649 | if (r) | |
1650 | goto out_free1; | |
6aa8b732 | 1651 | r = -EFAULT; |
3e4bb3ac XZ |
1652 | if (copy_to_user(argp, kvm_regs, sizeof(struct kvm_regs))) |
1653 | goto out_free1; | |
6aa8b732 | 1654 | r = 0; |
3e4bb3ac XZ |
1655 | out_free1: |
1656 | kfree(kvm_regs); | |
6aa8b732 AK |
1657 | break; |
1658 | } | |
1659 | case KVM_SET_REGS: { | |
3e4bb3ac | 1660 | struct kvm_regs *kvm_regs; |
6aa8b732 | 1661 | |
3e4bb3ac XZ |
1662 | r = -ENOMEM; |
1663 | kvm_regs = kzalloc(sizeof(struct kvm_regs), GFP_KERNEL); | |
1664 | if (!kvm_regs) | |
6aa8b732 | 1665 | goto out; |
3e4bb3ac XZ |
1666 | r = -EFAULT; |
1667 | if (copy_from_user(kvm_regs, argp, sizeof(struct kvm_regs))) | |
1668 | goto out_free2; | |
1669 | r = kvm_arch_vcpu_ioctl_set_regs(vcpu, kvm_regs); | |
6aa8b732 | 1670 | if (r) |
3e4bb3ac | 1671 | goto out_free2; |
6aa8b732 | 1672 | r = 0; |
3e4bb3ac XZ |
1673 | out_free2: |
1674 | kfree(kvm_regs); | |
6aa8b732 AK |
1675 | break; |
1676 | } | |
1677 | case KVM_GET_SREGS: { | |
fa3795a7 DH |
1678 | kvm_sregs = kzalloc(sizeof(struct kvm_sregs), GFP_KERNEL); |
1679 | r = -ENOMEM; | |
1680 | if (!kvm_sregs) | |
1681 | goto out; | |
1682 | r = kvm_arch_vcpu_ioctl_get_sregs(vcpu, kvm_sregs); | |
6aa8b732 AK |
1683 | if (r) |
1684 | goto out; | |
1685 | r = -EFAULT; | |
fa3795a7 | 1686 | if (copy_to_user(argp, kvm_sregs, sizeof(struct kvm_sregs))) |
6aa8b732 AK |
1687 | goto out; |
1688 | r = 0; | |
1689 | break; | |
1690 | } | |
1691 | case KVM_SET_SREGS: { | |
fa3795a7 DH |
1692 | kvm_sregs = kmalloc(sizeof(struct kvm_sregs), GFP_KERNEL); |
1693 | r = -ENOMEM; | |
1694 | if (!kvm_sregs) | |
1695 | goto out; | |
6aa8b732 | 1696 | r = -EFAULT; |
fa3795a7 | 1697 | if (copy_from_user(kvm_sregs, argp, sizeof(struct kvm_sregs))) |
6aa8b732 | 1698 | goto out; |
fa3795a7 | 1699 | r = kvm_arch_vcpu_ioctl_set_sregs(vcpu, kvm_sregs); |
6aa8b732 AK |
1700 | if (r) |
1701 | goto out; | |
1702 | r = 0; | |
1703 | break; | |
1704 | } | |
62d9f0db MT |
1705 | case KVM_GET_MP_STATE: { |
1706 | struct kvm_mp_state mp_state; | |
1707 | ||
1708 | r = kvm_arch_vcpu_ioctl_get_mpstate(vcpu, &mp_state); | |
1709 | if (r) | |
1710 | goto out; | |
1711 | r = -EFAULT; | |
1712 | if (copy_to_user(argp, &mp_state, sizeof mp_state)) | |
1713 | goto out; | |
1714 | r = 0; | |
1715 | break; | |
1716 | } | |
1717 | case KVM_SET_MP_STATE: { | |
1718 | struct kvm_mp_state mp_state; | |
1719 | ||
1720 | r = -EFAULT; | |
1721 | if (copy_from_user(&mp_state, argp, sizeof mp_state)) | |
1722 | goto out; | |
1723 | r = kvm_arch_vcpu_ioctl_set_mpstate(vcpu, &mp_state); | |
1724 | if (r) | |
1725 | goto out; | |
1726 | r = 0; | |
1727 | break; | |
1728 | } | |
6aa8b732 AK |
1729 | case KVM_TRANSLATE: { |
1730 | struct kvm_translation tr; | |
1731 | ||
1732 | r = -EFAULT; | |
2f366987 | 1733 | if (copy_from_user(&tr, argp, sizeof tr)) |
6aa8b732 | 1734 | goto out; |
8b006791 | 1735 | r = kvm_arch_vcpu_ioctl_translate(vcpu, &tr); |
6aa8b732 AK |
1736 | if (r) |
1737 | goto out; | |
1738 | r = -EFAULT; | |
2f366987 | 1739 | if (copy_to_user(argp, &tr, sizeof tr)) |
6aa8b732 AK |
1740 | goto out; |
1741 | r = 0; | |
1742 | break; | |
1743 | } | |
d0bfb940 JK |
1744 | case KVM_SET_GUEST_DEBUG: { |
1745 | struct kvm_guest_debug dbg; | |
6aa8b732 AK |
1746 | |
1747 | r = -EFAULT; | |
2f366987 | 1748 | if (copy_from_user(&dbg, argp, sizeof dbg)) |
6aa8b732 | 1749 | goto out; |
d0bfb940 | 1750 | r = kvm_arch_vcpu_ioctl_set_guest_debug(vcpu, &dbg); |
6aa8b732 AK |
1751 | if (r) |
1752 | goto out; | |
1753 | r = 0; | |
1754 | break; | |
1755 | } | |
1961d276 AK |
1756 | case KVM_SET_SIGNAL_MASK: { |
1757 | struct kvm_signal_mask __user *sigmask_arg = argp; | |
1758 | struct kvm_signal_mask kvm_sigmask; | |
1759 | sigset_t sigset, *p; | |
1760 | ||
1761 | p = NULL; | |
1762 | if (argp) { | |
1763 | r = -EFAULT; | |
1764 | if (copy_from_user(&kvm_sigmask, argp, | |
1765 | sizeof kvm_sigmask)) | |
1766 | goto out; | |
1767 | r = -EINVAL; | |
1768 | if (kvm_sigmask.len != sizeof sigset) | |
1769 | goto out; | |
1770 | r = -EFAULT; | |
1771 | if (copy_from_user(&sigset, sigmask_arg->sigset, | |
1772 | sizeof sigset)) | |
1773 | goto out; | |
1774 | p = &sigset; | |
1775 | } | |
376d41ff | 1776 | r = kvm_vcpu_ioctl_set_sigmask(vcpu, p); |
1961d276 AK |
1777 | break; |
1778 | } | |
b8836737 | 1779 | case KVM_GET_FPU: { |
fa3795a7 DH |
1780 | fpu = kzalloc(sizeof(struct kvm_fpu), GFP_KERNEL); |
1781 | r = -ENOMEM; | |
1782 | if (!fpu) | |
1783 | goto out; | |
1784 | r = kvm_arch_vcpu_ioctl_get_fpu(vcpu, fpu); | |
b8836737 AK |
1785 | if (r) |
1786 | goto out; | |
1787 | r = -EFAULT; | |
fa3795a7 | 1788 | if (copy_to_user(argp, fpu, sizeof(struct kvm_fpu))) |
b8836737 AK |
1789 | goto out; |
1790 | r = 0; | |
1791 | break; | |
1792 | } | |
1793 | case KVM_SET_FPU: { | |
fa3795a7 DH |
1794 | fpu = kmalloc(sizeof(struct kvm_fpu), GFP_KERNEL); |
1795 | r = -ENOMEM; | |
1796 | if (!fpu) | |
1797 | goto out; | |
b8836737 | 1798 | r = -EFAULT; |
fa3795a7 | 1799 | if (copy_from_user(fpu, argp, sizeof(struct kvm_fpu))) |
b8836737 | 1800 | goto out; |
fa3795a7 | 1801 | r = kvm_arch_vcpu_ioctl_set_fpu(vcpu, fpu); |
b8836737 AK |
1802 | if (r) |
1803 | goto out; | |
1804 | r = 0; | |
1805 | break; | |
1806 | } | |
bccf2150 | 1807 | default: |
313a3dc7 | 1808 | r = kvm_arch_vcpu_ioctl(filp, ioctl, arg); |
bccf2150 AK |
1809 | } |
1810 | out: | |
2122ff5e | 1811 | vcpu_put(vcpu); |
fa3795a7 DH |
1812 | kfree(fpu); |
1813 | kfree(kvm_sregs); | |
bccf2150 AK |
1814 | return r; |
1815 | } | |
1816 | ||
1817 | static long kvm_vm_ioctl(struct file *filp, | |
1818 | unsigned int ioctl, unsigned long arg) | |
1819 | { | |
1820 | struct kvm *kvm = filp->private_data; | |
1821 | void __user *argp = (void __user *)arg; | |
1fe779f8 | 1822 | int r; |
bccf2150 | 1823 | |
6d4e4c4f AK |
1824 | if (kvm->mm != current->mm) |
1825 | return -EIO; | |
bccf2150 AK |
1826 | switch (ioctl) { |
1827 | case KVM_CREATE_VCPU: | |
1828 | r = kvm_vm_ioctl_create_vcpu(kvm, arg); | |
1829 | if (r < 0) | |
1830 | goto out; | |
1831 | break; | |
6fc138d2 IE |
1832 | case KVM_SET_USER_MEMORY_REGION: { |
1833 | struct kvm_userspace_memory_region kvm_userspace_mem; | |
1834 | ||
1835 | r = -EFAULT; | |
1836 | if (copy_from_user(&kvm_userspace_mem, argp, | |
1837 | sizeof kvm_userspace_mem)) | |
1838 | goto out; | |
1839 | ||
1840 | r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_userspace_mem, 1); | |
6aa8b732 AK |
1841 | if (r) |
1842 | goto out; | |
1843 | break; | |
1844 | } | |
1845 | case KVM_GET_DIRTY_LOG: { | |
1846 | struct kvm_dirty_log log; | |
1847 | ||
1848 | r = -EFAULT; | |
2f366987 | 1849 | if (copy_from_user(&log, argp, sizeof log)) |
6aa8b732 | 1850 | goto out; |
2c6f5df9 | 1851 | r = kvm_vm_ioctl_get_dirty_log(kvm, &log); |
6aa8b732 AK |
1852 | if (r) |
1853 | goto out; | |
1854 | break; | |
1855 | } | |
5f94c174 LV |
1856 | #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET |
1857 | case KVM_REGISTER_COALESCED_MMIO: { | |
1858 | struct kvm_coalesced_mmio_zone zone; | |
1859 | r = -EFAULT; | |
1860 | if (copy_from_user(&zone, argp, sizeof zone)) | |
1861 | goto out; | |
5f94c174 LV |
1862 | r = kvm_vm_ioctl_register_coalesced_mmio(kvm, &zone); |
1863 | if (r) | |
1864 | goto out; | |
1865 | r = 0; | |
1866 | break; | |
1867 | } | |
1868 | case KVM_UNREGISTER_COALESCED_MMIO: { | |
1869 | struct kvm_coalesced_mmio_zone zone; | |
1870 | r = -EFAULT; | |
1871 | if (copy_from_user(&zone, argp, sizeof zone)) | |
1872 | goto out; | |
5f94c174 LV |
1873 | r = kvm_vm_ioctl_unregister_coalesced_mmio(kvm, &zone); |
1874 | if (r) | |
1875 | goto out; | |
1876 | r = 0; | |
1877 | break; | |
1878 | } | |
1879 | #endif | |
721eecbf GH |
1880 | case KVM_IRQFD: { |
1881 | struct kvm_irqfd data; | |
1882 | ||
1883 | r = -EFAULT; | |
1884 | if (copy_from_user(&data, argp, sizeof data)) | |
1885 | goto out; | |
1886 | r = kvm_irqfd(kvm, data.fd, data.gsi, data.flags); | |
1887 | break; | |
1888 | } | |
d34e6b17 GH |
1889 | case KVM_IOEVENTFD: { |
1890 | struct kvm_ioeventfd data; | |
1891 | ||
1892 | r = -EFAULT; | |
1893 | if (copy_from_user(&data, argp, sizeof data)) | |
1894 | goto out; | |
1895 | r = kvm_ioeventfd(kvm, &data); | |
1896 | break; | |
1897 | } | |
73880c80 GN |
1898 | #ifdef CONFIG_KVM_APIC_ARCHITECTURE |
1899 | case KVM_SET_BOOT_CPU_ID: | |
1900 | r = 0; | |
894a9c55 | 1901 | mutex_lock(&kvm->lock); |
73880c80 GN |
1902 | if (atomic_read(&kvm->online_vcpus) != 0) |
1903 | r = -EBUSY; | |
1904 | else | |
1905 | kvm->bsp_vcpu_id = arg; | |
894a9c55 | 1906 | mutex_unlock(&kvm->lock); |
73880c80 GN |
1907 | break; |
1908 | #endif | |
f17abe9a | 1909 | default: |
1fe779f8 | 1910 | r = kvm_arch_vm_ioctl(filp, ioctl, arg); |
bfd99ff5 AK |
1911 | if (r == -ENOTTY) |
1912 | r = kvm_vm_ioctl_assigned_device(kvm, ioctl, arg); | |
f17abe9a AK |
1913 | } |
1914 | out: | |
1915 | return r; | |
1916 | } | |
1917 | ||
6ff5894c AB |
1918 | #ifdef CONFIG_COMPAT |
1919 | struct compat_kvm_dirty_log { | |
1920 | __u32 slot; | |
1921 | __u32 padding1; | |
1922 | union { | |
1923 | compat_uptr_t dirty_bitmap; /* one bit per page */ | |
1924 | __u64 padding2; | |
1925 | }; | |
1926 | }; | |
1927 | ||
1928 | static long kvm_vm_compat_ioctl(struct file *filp, | |
1929 | unsigned int ioctl, unsigned long arg) | |
1930 | { | |
1931 | struct kvm *kvm = filp->private_data; | |
1932 | int r; | |
1933 | ||
1934 | if (kvm->mm != current->mm) | |
1935 | return -EIO; | |
1936 | switch (ioctl) { | |
1937 | case KVM_GET_DIRTY_LOG: { | |
1938 | struct compat_kvm_dirty_log compat_log; | |
1939 | struct kvm_dirty_log log; | |
1940 | ||
1941 | r = -EFAULT; | |
1942 | if (copy_from_user(&compat_log, (void __user *)arg, | |
1943 | sizeof(compat_log))) | |
1944 | goto out; | |
1945 | log.slot = compat_log.slot; | |
1946 | log.padding1 = compat_log.padding1; | |
1947 | log.padding2 = compat_log.padding2; | |
1948 | log.dirty_bitmap = compat_ptr(compat_log.dirty_bitmap); | |
1949 | ||
1950 | r = kvm_vm_ioctl_get_dirty_log(kvm, &log); | |
1951 | if (r) | |
1952 | goto out; | |
1953 | break; | |
1954 | } | |
1955 | default: | |
1956 | r = kvm_vm_ioctl(filp, ioctl, arg); | |
1957 | } | |
1958 | ||
1959 | out: | |
1960 | return r; | |
1961 | } | |
1962 | #endif | |
1963 | ||
e4a533a4 | 1964 | static int kvm_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf) |
f17abe9a | 1965 | { |
777b3f49 MT |
1966 | struct page *page[1]; |
1967 | unsigned long addr; | |
1968 | int npages; | |
1969 | gfn_t gfn = vmf->pgoff; | |
f17abe9a | 1970 | struct kvm *kvm = vma->vm_file->private_data; |
f17abe9a | 1971 | |
777b3f49 MT |
1972 | addr = gfn_to_hva(kvm, gfn); |
1973 | if (kvm_is_error_hva(addr)) | |
e4a533a4 | 1974 | return VM_FAULT_SIGBUS; |
777b3f49 MT |
1975 | |
1976 | npages = get_user_pages(current, current->mm, addr, 1, 1, 0, page, | |
1977 | NULL); | |
1978 | if (unlikely(npages != 1)) | |
e4a533a4 | 1979 | return VM_FAULT_SIGBUS; |
777b3f49 MT |
1980 | |
1981 | vmf->page = page[0]; | |
e4a533a4 | 1982 | return 0; |
f17abe9a AK |
1983 | } |
1984 | ||
f0f37e2f | 1985 | static const struct vm_operations_struct kvm_vm_vm_ops = { |
e4a533a4 | 1986 | .fault = kvm_vm_fault, |
f17abe9a AK |
1987 | }; |
1988 | ||
1989 | static int kvm_vm_mmap(struct file *file, struct vm_area_struct *vma) | |
1990 | { | |
1991 | vma->vm_ops = &kvm_vm_vm_ops; | |
1992 | return 0; | |
1993 | } | |
1994 | ||
3d3aab1b | 1995 | static struct file_operations kvm_vm_fops = { |
f17abe9a AK |
1996 | .release = kvm_vm_release, |
1997 | .unlocked_ioctl = kvm_vm_ioctl, | |
6ff5894c AB |
1998 | #ifdef CONFIG_COMPAT |
1999 | .compat_ioctl = kvm_vm_compat_ioctl, | |
2000 | #endif | |
f17abe9a | 2001 | .mmap = kvm_vm_mmap, |
6038f373 | 2002 | .llseek = noop_llseek, |
f17abe9a AK |
2003 | }; |
2004 | ||
2005 | static int kvm_dev_ioctl_create_vm(void) | |
2006 | { | |
aac87636 | 2007 | int r; |
f17abe9a AK |
2008 | struct kvm *kvm; |
2009 | ||
f17abe9a | 2010 | kvm = kvm_create_vm(); |
d6d28168 AK |
2011 | if (IS_ERR(kvm)) |
2012 | return PTR_ERR(kvm); | |
6ce5a090 TY |
2013 | #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET |
2014 | r = kvm_coalesced_mmio_init(kvm); | |
2015 | if (r < 0) { | |
2016 | kvm_put_kvm(kvm); | |
2017 | return r; | |
2018 | } | |
2019 | #endif | |
aac87636 HC |
2020 | r = anon_inode_getfd("kvm-vm", &kvm_vm_fops, kvm, O_RDWR); |
2021 | if (r < 0) | |
66c0b394 | 2022 | kvm_put_kvm(kvm); |
f17abe9a | 2023 | |
aac87636 | 2024 | return r; |
f17abe9a AK |
2025 | } |
2026 | ||
1a811b61 AK |
2027 | static long kvm_dev_ioctl_check_extension_generic(long arg) |
2028 | { | |
2029 | switch (arg) { | |
ca9edaee | 2030 | case KVM_CAP_USER_MEMORY: |
1a811b61 | 2031 | case KVM_CAP_DESTROY_MEMORY_REGION_WORKS: |
4cd481f6 | 2032 | case KVM_CAP_JOIN_MEMORY_REGIONS_WORKS: |
73880c80 GN |
2033 | #ifdef CONFIG_KVM_APIC_ARCHITECTURE |
2034 | case KVM_CAP_SET_BOOT_CPU_ID: | |
2035 | #endif | |
a9c7399d | 2036 | case KVM_CAP_INTERNAL_ERROR_DATA: |
1a811b61 | 2037 | return 1; |
399ec807 AK |
2038 | #ifdef CONFIG_HAVE_KVM_IRQCHIP |
2039 | case KVM_CAP_IRQ_ROUTING: | |
36463146 | 2040 | return KVM_MAX_IRQ_ROUTES; |
399ec807 | 2041 | #endif |
1a811b61 AK |
2042 | default: |
2043 | break; | |
2044 | } | |
2045 | return kvm_dev_ioctl_check_extension(arg); | |
2046 | } | |
2047 | ||
f17abe9a AK |
2048 | static long kvm_dev_ioctl(struct file *filp, |
2049 | unsigned int ioctl, unsigned long arg) | |
2050 | { | |
07c45a36 | 2051 | long r = -EINVAL; |
f17abe9a AK |
2052 | |
2053 | switch (ioctl) { | |
2054 | case KVM_GET_API_VERSION: | |
f0fe5108 AK |
2055 | r = -EINVAL; |
2056 | if (arg) | |
2057 | goto out; | |
f17abe9a AK |
2058 | r = KVM_API_VERSION; |
2059 | break; | |
2060 | case KVM_CREATE_VM: | |
f0fe5108 AK |
2061 | r = -EINVAL; |
2062 | if (arg) | |
2063 | goto out; | |
f17abe9a AK |
2064 | r = kvm_dev_ioctl_create_vm(); |
2065 | break; | |
018d00d2 | 2066 | case KVM_CHECK_EXTENSION: |
1a811b61 | 2067 | r = kvm_dev_ioctl_check_extension_generic(arg); |
5d308f45 | 2068 | break; |
07c45a36 AK |
2069 | case KVM_GET_VCPU_MMAP_SIZE: |
2070 | r = -EINVAL; | |
2071 | if (arg) | |
2072 | goto out; | |
adb1ff46 AK |
2073 | r = PAGE_SIZE; /* struct kvm_run */ |
2074 | #ifdef CONFIG_X86 | |
2075 | r += PAGE_SIZE; /* pio data page */ | |
5f94c174 LV |
2076 | #endif |
2077 | #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET | |
2078 | r += PAGE_SIZE; /* coalesced mmio ring page */ | |
adb1ff46 | 2079 | #endif |
07c45a36 | 2080 | break; |
d4c9ff2d FEL |
2081 | case KVM_TRACE_ENABLE: |
2082 | case KVM_TRACE_PAUSE: | |
2083 | case KVM_TRACE_DISABLE: | |
2023a29c | 2084 | r = -EOPNOTSUPP; |
d4c9ff2d | 2085 | break; |
6aa8b732 | 2086 | default: |
043405e1 | 2087 | return kvm_arch_dev_ioctl(filp, ioctl, arg); |
6aa8b732 AK |
2088 | } |
2089 | out: | |
2090 | return r; | |
2091 | } | |
2092 | ||
6aa8b732 | 2093 | static struct file_operations kvm_chardev_ops = { |
6aa8b732 AK |
2094 | .unlocked_ioctl = kvm_dev_ioctl, |
2095 | .compat_ioctl = kvm_dev_ioctl, | |
6038f373 | 2096 | .llseek = noop_llseek, |
6aa8b732 AK |
2097 | }; |
2098 | ||
2099 | static struct miscdevice kvm_dev = { | |
bbe4432e | 2100 | KVM_MINOR, |
6aa8b732 AK |
2101 | "kvm", |
2102 | &kvm_chardev_ops, | |
2103 | }; | |
2104 | ||
75b7127c | 2105 | static void hardware_enable_nolock(void *junk) |
1b6c0168 AK |
2106 | { |
2107 | int cpu = raw_smp_processor_id(); | |
10474ae8 | 2108 | int r; |
1b6c0168 | 2109 | |
7f59f492 | 2110 | if (cpumask_test_cpu(cpu, cpus_hardware_enabled)) |
1b6c0168 | 2111 | return; |
10474ae8 | 2112 | |
7f59f492 | 2113 | cpumask_set_cpu(cpu, cpus_hardware_enabled); |
10474ae8 AG |
2114 | |
2115 | r = kvm_arch_hardware_enable(NULL); | |
2116 | ||
2117 | if (r) { | |
2118 | cpumask_clear_cpu(cpu, cpus_hardware_enabled); | |
2119 | atomic_inc(&hardware_enable_failed); | |
2120 | printk(KERN_INFO "kvm: enabling virtualization on " | |
2121 | "CPU%d failed\n", cpu); | |
2122 | } | |
1b6c0168 AK |
2123 | } |
2124 | ||
75b7127c TY |
2125 | static void hardware_enable(void *junk) |
2126 | { | |
2127 | spin_lock(&kvm_lock); | |
2128 | hardware_enable_nolock(junk); | |
2129 | spin_unlock(&kvm_lock); | |
2130 | } | |
2131 | ||
2132 | static void hardware_disable_nolock(void *junk) | |
1b6c0168 AK |
2133 | { |
2134 | int cpu = raw_smp_processor_id(); | |
2135 | ||
7f59f492 | 2136 | if (!cpumask_test_cpu(cpu, cpus_hardware_enabled)) |
1b6c0168 | 2137 | return; |
7f59f492 | 2138 | cpumask_clear_cpu(cpu, cpus_hardware_enabled); |
e9b11c17 | 2139 | kvm_arch_hardware_disable(NULL); |
1b6c0168 AK |
2140 | } |
2141 | ||
75b7127c TY |
2142 | static void hardware_disable(void *junk) |
2143 | { | |
2144 | spin_lock(&kvm_lock); | |
2145 | hardware_disable_nolock(junk); | |
2146 | spin_unlock(&kvm_lock); | |
2147 | } | |
2148 | ||
10474ae8 AG |
2149 | static void hardware_disable_all_nolock(void) |
2150 | { | |
2151 | BUG_ON(!kvm_usage_count); | |
2152 | ||
2153 | kvm_usage_count--; | |
2154 | if (!kvm_usage_count) | |
75b7127c | 2155 | on_each_cpu(hardware_disable_nolock, NULL, 1); |
10474ae8 AG |
2156 | } |
2157 | ||
2158 | static void hardware_disable_all(void) | |
2159 | { | |
2160 | spin_lock(&kvm_lock); | |
2161 | hardware_disable_all_nolock(); | |
2162 | spin_unlock(&kvm_lock); | |
2163 | } | |
2164 | ||
2165 | static int hardware_enable_all(void) | |
2166 | { | |
2167 | int r = 0; | |
2168 | ||
2169 | spin_lock(&kvm_lock); | |
2170 | ||
2171 | kvm_usage_count++; | |
2172 | if (kvm_usage_count == 1) { | |
2173 | atomic_set(&hardware_enable_failed, 0); | |
75b7127c | 2174 | on_each_cpu(hardware_enable_nolock, NULL, 1); |
10474ae8 AG |
2175 | |
2176 | if (atomic_read(&hardware_enable_failed)) { | |
2177 | hardware_disable_all_nolock(); | |
2178 | r = -EBUSY; | |
2179 | } | |
2180 | } | |
2181 | ||
2182 | spin_unlock(&kvm_lock); | |
2183 | ||
2184 | return r; | |
2185 | } | |
2186 | ||
774c47f1 AK |
2187 | static int kvm_cpu_hotplug(struct notifier_block *notifier, unsigned long val, |
2188 | void *v) | |
2189 | { | |
2190 | int cpu = (long)v; | |
2191 | ||
10474ae8 AG |
2192 | if (!kvm_usage_count) |
2193 | return NOTIFY_OK; | |
2194 | ||
1a6f4d7f | 2195 | val &= ~CPU_TASKS_FROZEN; |
774c47f1 | 2196 | switch (val) { |
cec9ad27 | 2197 | case CPU_DYING: |
6ec8a856 AK |
2198 | printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n", |
2199 | cpu); | |
2200 | hardware_disable(NULL); | |
2201 | break; | |
da908f2f | 2202 | case CPU_STARTING: |
43934a38 JK |
2203 | printk(KERN_INFO "kvm: enabling virtualization on CPU%d\n", |
2204 | cpu); | |
da908f2f | 2205 | hardware_enable(NULL); |
774c47f1 AK |
2206 | break; |
2207 | } | |
2208 | return NOTIFY_OK; | |
2209 | } | |
2210 | ||
4ecac3fd | 2211 | |
b7c4145b | 2212 | asmlinkage void kvm_spurious_fault(void) |
4ecac3fd | 2213 | { |
4ecac3fd AK |
2214 | /* Fault while not rebooting. We want the trace. */ |
2215 | BUG(); | |
2216 | } | |
b7c4145b | 2217 | EXPORT_SYMBOL_GPL(kvm_spurious_fault); |
4ecac3fd | 2218 | |
9a2b85c6 | 2219 | static int kvm_reboot(struct notifier_block *notifier, unsigned long val, |
d77c26fc | 2220 | void *v) |
9a2b85c6 | 2221 | { |
8e1c1815 SY |
2222 | /* |
2223 | * Some (well, at least mine) BIOSes hang on reboot if | |
2224 | * in vmx root mode. | |
2225 | * | |
2226 | * And Intel TXT required VMX off for all cpu when system shutdown. | |
2227 | */ | |
2228 | printk(KERN_INFO "kvm: exiting hardware virtualization\n"); | |
2229 | kvm_rebooting = true; | |
75b7127c | 2230 | on_each_cpu(hardware_disable_nolock, NULL, 1); |
9a2b85c6 RR |
2231 | return NOTIFY_OK; |
2232 | } | |
2233 | ||
2234 | static struct notifier_block kvm_reboot_notifier = { | |
2235 | .notifier_call = kvm_reboot, | |
2236 | .priority = 0, | |
2237 | }; | |
2238 | ||
e93f8a0f | 2239 | static void kvm_io_bus_destroy(struct kvm_io_bus *bus) |
2eeb2e94 GH |
2240 | { |
2241 | int i; | |
2242 | ||
2243 | for (i = 0; i < bus->dev_count; i++) { | |
2244 | struct kvm_io_device *pos = bus->devs[i]; | |
2245 | ||
2246 | kvm_iodevice_destructor(pos); | |
2247 | } | |
e93f8a0f | 2248 | kfree(bus); |
2eeb2e94 GH |
2249 | } |
2250 | ||
bda9020e | 2251 | /* kvm_io_bus_write - called under kvm->slots_lock */ |
e93f8a0f | 2252 | int kvm_io_bus_write(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr, |
bda9020e | 2253 | int len, const void *val) |
2eeb2e94 GH |
2254 | { |
2255 | int i; | |
90d83dc3 LJ |
2256 | struct kvm_io_bus *bus; |
2257 | ||
2258 | bus = srcu_dereference(kvm->buses[bus_idx], &kvm->srcu); | |
bda9020e MT |
2259 | for (i = 0; i < bus->dev_count; i++) |
2260 | if (!kvm_iodevice_write(bus->devs[i], addr, len, val)) | |
2261 | return 0; | |
2262 | return -EOPNOTSUPP; | |
2263 | } | |
2eeb2e94 | 2264 | |
bda9020e | 2265 | /* kvm_io_bus_read - called under kvm->slots_lock */ |
e93f8a0f MT |
2266 | int kvm_io_bus_read(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr, |
2267 | int len, void *val) | |
bda9020e MT |
2268 | { |
2269 | int i; | |
90d83dc3 | 2270 | struct kvm_io_bus *bus; |
e93f8a0f | 2271 | |
90d83dc3 | 2272 | bus = srcu_dereference(kvm->buses[bus_idx], &kvm->srcu); |
bda9020e MT |
2273 | for (i = 0; i < bus->dev_count; i++) |
2274 | if (!kvm_iodevice_read(bus->devs[i], addr, len, val)) | |
2275 | return 0; | |
2276 | return -EOPNOTSUPP; | |
2eeb2e94 GH |
2277 | } |
2278 | ||
79fac95e | 2279 | /* Caller must hold slots_lock. */ |
e93f8a0f MT |
2280 | int kvm_io_bus_register_dev(struct kvm *kvm, enum kvm_bus bus_idx, |
2281 | struct kvm_io_device *dev) | |
6c474694 | 2282 | { |
e93f8a0f | 2283 | struct kvm_io_bus *new_bus, *bus; |
090b7aff | 2284 | |
e93f8a0f | 2285 | bus = kvm->buses[bus_idx]; |
090b7aff GH |
2286 | if (bus->dev_count > NR_IOBUS_DEVS-1) |
2287 | return -ENOSPC; | |
2eeb2e94 | 2288 | |
e93f8a0f MT |
2289 | new_bus = kzalloc(sizeof(struct kvm_io_bus), GFP_KERNEL); |
2290 | if (!new_bus) | |
2291 | return -ENOMEM; | |
2292 | memcpy(new_bus, bus, sizeof(struct kvm_io_bus)); | |
2293 | new_bus->devs[new_bus->dev_count++] = dev; | |
2294 | rcu_assign_pointer(kvm->buses[bus_idx], new_bus); | |
2295 | synchronize_srcu_expedited(&kvm->srcu); | |
2296 | kfree(bus); | |
090b7aff GH |
2297 | |
2298 | return 0; | |
2299 | } | |
2300 | ||
79fac95e | 2301 | /* Caller must hold slots_lock. */ |
e93f8a0f MT |
2302 | int kvm_io_bus_unregister_dev(struct kvm *kvm, enum kvm_bus bus_idx, |
2303 | struct kvm_io_device *dev) | |
090b7aff | 2304 | { |
e93f8a0f MT |
2305 | int i, r; |
2306 | struct kvm_io_bus *new_bus, *bus; | |
090b7aff | 2307 | |
e93f8a0f MT |
2308 | new_bus = kzalloc(sizeof(struct kvm_io_bus), GFP_KERNEL); |
2309 | if (!new_bus) | |
2310 | return -ENOMEM; | |
090b7aff | 2311 | |
e93f8a0f MT |
2312 | bus = kvm->buses[bus_idx]; |
2313 | memcpy(new_bus, bus, sizeof(struct kvm_io_bus)); | |
2314 | ||
2315 | r = -ENOENT; | |
2316 | for (i = 0; i < new_bus->dev_count; i++) | |
2317 | if (new_bus->devs[i] == dev) { | |
2318 | r = 0; | |
2319 | new_bus->devs[i] = new_bus->devs[--new_bus->dev_count]; | |
090b7aff GH |
2320 | break; |
2321 | } | |
e93f8a0f MT |
2322 | |
2323 | if (r) { | |
2324 | kfree(new_bus); | |
2325 | return r; | |
2326 | } | |
2327 | ||
2328 | rcu_assign_pointer(kvm->buses[bus_idx], new_bus); | |
2329 | synchronize_srcu_expedited(&kvm->srcu); | |
2330 | kfree(bus); | |
2331 | return r; | |
2eeb2e94 GH |
2332 | } |
2333 | ||
774c47f1 AK |
2334 | static struct notifier_block kvm_cpu_notifier = { |
2335 | .notifier_call = kvm_cpu_hotplug, | |
774c47f1 AK |
2336 | }; |
2337 | ||
8b88b099 | 2338 | static int vm_stat_get(void *_offset, u64 *val) |
ba1389b7 AK |
2339 | { |
2340 | unsigned offset = (long)_offset; | |
ba1389b7 AK |
2341 | struct kvm *kvm; |
2342 | ||
8b88b099 | 2343 | *val = 0; |
ba1389b7 AK |
2344 | spin_lock(&kvm_lock); |
2345 | list_for_each_entry(kvm, &vm_list, vm_list) | |
8b88b099 | 2346 | *val += *(u32 *)((void *)kvm + offset); |
ba1389b7 | 2347 | spin_unlock(&kvm_lock); |
8b88b099 | 2348 | return 0; |
ba1389b7 AK |
2349 | } |
2350 | ||
2351 | DEFINE_SIMPLE_ATTRIBUTE(vm_stat_fops, vm_stat_get, NULL, "%llu\n"); | |
2352 | ||
8b88b099 | 2353 | static int vcpu_stat_get(void *_offset, u64 *val) |
1165f5fe AK |
2354 | { |
2355 | unsigned offset = (long)_offset; | |
1165f5fe AK |
2356 | struct kvm *kvm; |
2357 | struct kvm_vcpu *vcpu; | |
2358 | int i; | |
2359 | ||
8b88b099 | 2360 | *val = 0; |
1165f5fe AK |
2361 | spin_lock(&kvm_lock); |
2362 | list_for_each_entry(kvm, &vm_list, vm_list) | |
988a2cae GN |
2363 | kvm_for_each_vcpu(i, vcpu, kvm) |
2364 | *val += *(u32 *)((void *)vcpu + offset); | |
2365 | ||
1165f5fe | 2366 | spin_unlock(&kvm_lock); |
8b88b099 | 2367 | return 0; |
1165f5fe AK |
2368 | } |
2369 | ||
ba1389b7 AK |
2370 | DEFINE_SIMPLE_ATTRIBUTE(vcpu_stat_fops, vcpu_stat_get, NULL, "%llu\n"); |
2371 | ||
828c0950 | 2372 | static const struct file_operations *stat_fops[] = { |
ba1389b7 AK |
2373 | [KVM_STAT_VCPU] = &vcpu_stat_fops, |
2374 | [KVM_STAT_VM] = &vm_stat_fops, | |
2375 | }; | |
1165f5fe | 2376 | |
a16b043c | 2377 | static void kvm_init_debug(void) |
6aa8b732 AK |
2378 | { |
2379 | struct kvm_stats_debugfs_item *p; | |
2380 | ||
76f7c879 | 2381 | kvm_debugfs_dir = debugfs_create_dir("kvm", NULL); |
6aa8b732 | 2382 | for (p = debugfs_entries; p->name; ++p) |
76f7c879 | 2383 | p->dentry = debugfs_create_file(p->name, 0444, kvm_debugfs_dir, |
1165f5fe | 2384 | (void *)(long)p->offset, |
ba1389b7 | 2385 | stat_fops[p->kind]); |
6aa8b732 AK |
2386 | } |
2387 | ||
2388 | static void kvm_exit_debug(void) | |
2389 | { | |
2390 | struct kvm_stats_debugfs_item *p; | |
2391 | ||
2392 | for (p = debugfs_entries; p->name; ++p) | |
2393 | debugfs_remove(p->dentry); | |
76f7c879 | 2394 | debugfs_remove(kvm_debugfs_dir); |
6aa8b732 AK |
2395 | } |
2396 | ||
59ae6c6b AK |
2397 | static int kvm_suspend(struct sys_device *dev, pm_message_t state) |
2398 | { | |
10474ae8 | 2399 | if (kvm_usage_count) |
75b7127c | 2400 | hardware_disable_nolock(NULL); |
59ae6c6b AK |
2401 | return 0; |
2402 | } | |
2403 | ||
2404 | static int kvm_resume(struct sys_device *dev) | |
2405 | { | |
ca84d1a2 ZA |
2406 | if (kvm_usage_count) { |
2407 | WARN_ON(spin_is_locked(&kvm_lock)); | |
75b7127c | 2408 | hardware_enable_nolock(NULL); |
ca84d1a2 | 2409 | } |
59ae6c6b AK |
2410 | return 0; |
2411 | } | |
2412 | ||
2413 | static struct sysdev_class kvm_sysdev_class = { | |
af5ca3f4 | 2414 | .name = "kvm", |
59ae6c6b AK |
2415 | .suspend = kvm_suspend, |
2416 | .resume = kvm_resume, | |
2417 | }; | |
2418 | ||
2419 | static struct sys_device kvm_sysdev = { | |
2420 | .id = 0, | |
2421 | .cls = &kvm_sysdev_class, | |
2422 | }; | |
2423 | ||
cea7bb21 | 2424 | struct page *bad_page; |
35149e21 | 2425 | pfn_t bad_pfn; |
6aa8b732 | 2426 | |
15ad7146 AK |
2427 | static inline |
2428 | struct kvm_vcpu *preempt_notifier_to_vcpu(struct preempt_notifier *pn) | |
2429 | { | |
2430 | return container_of(pn, struct kvm_vcpu, preempt_notifier); | |
2431 | } | |
2432 | ||
2433 | static void kvm_sched_in(struct preempt_notifier *pn, int cpu) | |
2434 | { | |
2435 | struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn); | |
2436 | ||
e9b11c17 | 2437 | kvm_arch_vcpu_load(vcpu, cpu); |
15ad7146 AK |
2438 | } |
2439 | ||
2440 | static void kvm_sched_out(struct preempt_notifier *pn, | |
2441 | struct task_struct *next) | |
2442 | { | |
2443 | struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn); | |
2444 | ||
e9b11c17 | 2445 | kvm_arch_vcpu_put(vcpu); |
15ad7146 AK |
2446 | } |
2447 | ||
0ee75bea | 2448 | int kvm_init(void *opaque, unsigned vcpu_size, unsigned vcpu_align, |
c16f862d | 2449 | struct module *module) |
6aa8b732 AK |
2450 | { |
2451 | int r; | |
002c7f7c | 2452 | int cpu; |
6aa8b732 | 2453 | |
f8c16bba ZX |
2454 | r = kvm_arch_init(opaque); |
2455 | if (r) | |
d2308784 | 2456 | goto out_fail; |
cb498ea2 ZX |
2457 | |
2458 | bad_page = alloc_page(GFP_KERNEL | __GFP_ZERO); | |
2459 | ||
2460 | if (bad_page == NULL) { | |
2461 | r = -ENOMEM; | |
2462 | goto out; | |
2463 | } | |
2464 | ||
35149e21 AL |
2465 | bad_pfn = page_to_pfn(bad_page); |
2466 | ||
bf998156 HY |
2467 | hwpoison_page = alloc_page(GFP_KERNEL | __GFP_ZERO); |
2468 | ||
2469 | if (hwpoison_page == NULL) { | |
2470 | r = -ENOMEM; | |
2471 | goto out_free_0; | |
2472 | } | |
2473 | ||
2474 | hwpoison_pfn = page_to_pfn(hwpoison_page); | |
2475 | ||
edba23e5 GN |
2476 | fault_page = alloc_page(GFP_KERNEL | __GFP_ZERO); |
2477 | ||
2478 | if (fault_page == NULL) { | |
2479 | r = -ENOMEM; | |
2480 | goto out_free_0; | |
2481 | } | |
2482 | ||
2483 | fault_pfn = page_to_pfn(fault_page); | |
2484 | ||
8437a617 | 2485 | if (!zalloc_cpumask_var(&cpus_hardware_enabled, GFP_KERNEL)) { |
7f59f492 RR |
2486 | r = -ENOMEM; |
2487 | goto out_free_0; | |
2488 | } | |
2489 | ||
e9b11c17 | 2490 | r = kvm_arch_hardware_setup(); |
6aa8b732 | 2491 | if (r < 0) |
7f59f492 | 2492 | goto out_free_0a; |
6aa8b732 | 2493 | |
002c7f7c YS |
2494 | for_each_online_cpu(cpu) { |
2495 | smp_call_function_single(cpu, | |
e9b11c17 | 2496 | kvm_arch_check_processor_compat, |
8691e5a8 | 2497 | &r, 1); |
002c7f7c | 2498 | if (r < 0) |
d2308784 | 2499 | goto out_free_1; |
002c7f7c YS |
2500 | } |
2501 | ||
774c47f1 AK |
2502 | r = register_cpu_notifier(&kvm_cpu_notifier); |
2503 | if (r) | |
d2308784 | 2504 | goto out_free_2; |
6aa8b732 AK |
2505 | register_reboot_notifier(&kvm_reboot_notifier); |
2506 | ||
59ae6c6b AK |
2507 | r = sysdev_class_register(&kvm_sysdev_class); |
2508 | if (r) | |
d2308784 | 2509 | goto out_free_3; |
59ae6c6b AK |
2510 | |
2511 | r = sysdev_register(&kvm_sysdev); | |
2512 | if (r) | |
d2308784 | 2513 | goto out_free_4; |
59ae6c6b | 2514 | |
c16f862d | 2515 | /* A kmem cache lets us meet the alignment requirements of fx_save. */ |
0ee75bea AK |
2516 | if (!vcpu_align) |
2517 | vcpu_align = __alignof__(struct kvm_vcpu); | |
2518 | kvm_vcpu_cache = kmem_cache_create("kvm_vcpu", vcpu_size, vcpu_align, | |
56919c5c | 2519 | 0, NULL); |
c16f862d RR |
2520 | if (!kvm_vcpu_cache) { |
2521 | r = -ENOMEM; | |
d2308784 | 2522 | goto out_free_5; |
c16f862d RR |
2523 | } |
2524 | ||
af585b92 GN |
2525 | r = kvm_async_pf_init(); |
2526 | if (r) | |
2527 | goto out_free; | |
2528 | ||
6aa8b732 | 2529 | kvm_chardev_ops.owner = module; |
3d3aab1b CB |
2530 | kvm_vm_fops.owner = module; |
2531 | kvm_vcpu_fops.owner = module; | |
6aa8b732 AK |
2532 | |
2533 | r = misc_register(&kvm_dev); | |
2534 | if (r) { | |
d77c26fc | 2535 | printk(KERN_ERR "kvm: misc device register failed\n"); |
af585b92 | 2536 | goto out_unreg; |
6aa8b732 AK |
2537 | } |
2538 | ||
15ad7146 AK |
2539 | kvm_preempt_ops.sched_in = kvm_sched_in; |
2540 | kvm_preempt_ops.sched_out = kvm_sched_out; | |
2541 | ||
0ea4ed8e DW |
2542 | kvm_init_debug(); |
2543 | ||
c7addb90 | 2544 | return 0; |
6aa8b732 | 2545 | |
af585b92 GN |
2546 | out_unreg: |
2547 | kvm_async_pf_deinit(); | |
6aa8b732 | 2548 | out_free: |
c16f862d | 2549 | kmem_cache_destroy(kvm_vcpu_cache); |
d2308784 | 2550 | out_free_5: |
59ae6c6b | 2551 | sysdev_unregister(&kvm_sysdev); |
d2308784 | 2552 | out_free_4: |
59ae6c6b | 2553 | sysdev_class_unregister(&kvm_sysdev_class); |
d2308784 | 2554 | out_free_3: |
6aa8b732 | 2555 | unregister_reboot_notifier(&kvm_reboot_notifier); |
774c47f1 | 2556 | unregister_cpu_notifier(&kvm_cpu_notifier); |
d2308784 | 2557 | out_free_2: |
d2308784 | 2558 | out_free_1: |
e9b11c17 | 2559 | kvm_arch_hardware_unsetup(); |
7f59f492 RR |
2560 | out_free_0a: |
2561 | free_cpumask_var(cpus_hardware_enabled); | |
d2308784 | 2562 | out_free_0: |
edba23e5 GN |
2563 | if (fault_page) |
2564 | __free_page(fault_page); | |
bf998156 HY |
2565 | if (hwpoison_page) |
2566 | __free_page(hwpoison_page); | |
d2308784 | 2567 | __free_page(bad_page); |
ca45aaae | 2568 | out: |
f8c16bba | 2569 | kvm_arch_exit(); |
d2308784 | 2570 | out_fail: |
6aa8b732 AK |
2571 | return r; |
2572 | } | |
cb498ea2 | 2573 | EXPORT_SYMBOL_GPL(kvm_init); |
6aa8b732 | 2574 | |
cb498ea2 | 2575 | void kvm_exit(void) |
6aa8b732 | 2576 | { |
0ea4ed8e | 2577 | kvm_exit_debug(); |
6aa8b732 | 2578 | misc_deregister(&kvm_dev); |
c16f862d | 2579 | kmem_cache_destroy(kvm_vcpu_cache); |
af585b92 | 2580 | kvm_async_pf_deinit(); |
59ae6c6b AK |
2581 | sysdev_unregister(&kvm_sysdev); |
2582 | sysdev_class_unregister(&kvm_sysdev_class); | |
6aa8b732 | 2583 | unregister_reboot_notifier(&kvm_reboot_notifier); |
59ae6c6b | 2584 | unregister_cpu_notifier(&kvm_cpu_notifier); |
75b7127c | 2585 | on_each_cpu(hardware_disable_nolock, NULL, 1); |
e9b11c17 | 2586 | kvm_arch_hardware_unsetup(); |
f8c16bba | 2587 | kvm_arch_exit(); |
7f59f492 | 2588 | free_cpumask_var(cpus_hardware_enabled); |
bf998156 | 2589 | __free_page(hwpoison_page); |
cea7bb21 | 2590 | __free_page(bad_page); |
6aa8b732 | 2591 | } |
cb498ea2 | 2592 | EXPORT_SYMBOL_GPL(kvm_exit); |