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; | |
6ef7a1bc RR |
174 | if (cpus != NULL && cpu != -1 && cpu != me) |
175 | cpumask_set_cpu(cpu, cpus); | |
49846896 | 176 | } |
6ef7a1bc RR |
177 | if (unlikely(cpus == NULL)) |
178 | smp_call_function_many(cpu_online_mask, ack_flush, NULL, 1); | |
179 | else if (!cpumask_empty(cpus)) | |
180 | smp_call_function_many(cpus, ack_flush, NULL, 1); | |
181 | else | |
182 | called = false; | |
70e335e1 | 183 | raw_spin_unlock(&kvm->requests_lock); |
6ef7a1bc | 184 | free_cpumask_var(cpus); |
49846896 | 185 | return called; |
d9e368d6 AK |
186 | } |
187 | ||
49846896 | 188 | void kvm_flush_remote_tlbs(struct kvm *kvm) |
2e53d63a | 189 | { |
a4ee1ca4 XG |
190 | int dirty_count = kvm->tlbs_dirty; |
191 | ||
192 | smp_mb(); | |
49846896 RR |
193 | if (make_all_cpus_request(kvm, KVM_REQ_TLB_FLUSH)) |
194 | ++kvm->stat.remote_tlb_flush; | |
a4ee1ca4 | 195 | cmpxchg(&kvm->tlbs_dirty, dirty_count, 0); |
2e53d63a MT |
196 | } |
197 | ||
49846896 RR |
198 | void kvm_reload_remote_mmus(struct kvm *kvm) |
199 | { | |
200 | make_all_cpus_request(kvm, KVM_REQ_MMU_RELOAD); | |
201 | } | |
2e53d63a | 202 | |
fb3f0f51 RR |
203 | int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id) |
204 | { | |
205 | struct page *page; | |
206 | int r; | |
207 | ||
208 | mutex_init(&vcpu->mutex); | |
209 | vcpu->cpu = -1; | |
fb3f0f51 RR |
210 | vcpu->kvm = kvm; |
211 | vcpu->vcpu_id = id; | |
b6958ce4 | 212 | init_waitqueue_head(&vcpu->wq); |
af585b92 | 213 | kvm_async_pf_vcpu_init(vcpu); |
fb3f0f51 RR |
214 | |
215 | page = alloc_page(GFP_KERNEL | __GFP_ZERO); | |
216 | if (!page) { | |
217 | r = -ENOMEM; | |
218 | goto fail; | |
219 | } | |
220 | vcpu->run = page_address(page); | |
221 | ||
e9b11c17 | 222 | r = kvm_arch_vcpu_init(vcpu); |
fb3f0f51 | 223 | if (r < 0) |
e9b11c17 | 224 | goto fail_free_run; |
fb3f0f51 RR |
225 | return 0; |
226 | ||
fb3f0f51 RR |
227 | fail_free_run: |
228 | free_page((unsigned long)vcpu->run); | |
229 | fail: | |
76fafa5e | 230 | return r; |
fb3f0f51 RR |
231 | } |
232 | EXPORT_SYMBOL_GPL(kvm_vcpu_init); | |
233 | ||
234 | void kvm_vcpu_uninit(struct kvm_vcpu *vcpu) | |
235 | { | |
e9b11c17 | 236 | kvm_arch_vcpu_uninit(vcpu); |
fb3f0f51 RR |
237 | free_page((unsigned long)vcpu->run); |
238 | } | |
239 | EXPORT_SYMBOL_GPL(kvm_vcpu_uninit); | |
240 | ||
e930bffe AA |
241 | #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER) |
242 | static inline struct kvm *mmu_notifier_to_kvm(struct mmu_notifier *mn) | |
243 | { | |
244 | return container_of(mn, struct kvm, mmu_notifier); | |
245 | } | |
246 | ||
247 | static void kvm_mmu_notifier_invalidate_page(struct mmu_notifier *mn, | |
248 | struct mm_struct *mm, | |
249 | unsigned long address) | |
250 | { | |
251 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
bc6678a3 | 252 | int need_tlb_flush, idx; |
e930bffe AA |
253 | |
254 | /* | |
255 | * When ->invalidate_page runs, the linux pte has been zapped | |
256 | * already but the page is still allocated until | |
257 | * ->invalidate_page returns. So if we increase the sequence | |
258 | * here the kvm page fault will notice if the spte can't be | |
259 | * established because the page is going to be freed. If | |
260 | * instead the kvm page fault establishes the spte before | |
261 | * ->invalidate_page runs, kvm_unmap_hva will release it | |
262 | * before returning. | |
263 | * | |
264 | * The sequence increase only need to be seen at spin_unlock | |
265 | * time, and not at spin_lock time. | |
266 | * | |
267 | * Increasing the sequence after the spin_unlock would be | |
268 | * unsafe because the kvm page fault could then establish the | |
269 | * pte after kvm_unmap_hva returned, without noticing the page | |
270 | * is going to be freed. | |
271 | */ | |
bc6678a3 | 272 | idx = srcu_read_lock(&kvm->srcu); |
e930bffe AA |
273 | spin_lock(&kvm->mmu_lock); |
274 | kvm->mmu_notifier_seq++; | |
a4ee1ca4 | 275 | need_tlb_flush = kvm_unmap_hva(kvm, address) | kvm->tlbs_dirty; |
e930bffe | 276 | spin_unlock(&kvm->mmu_lock); |
bc6678a3 | 277 | srcu_read_unlock(&kvm->srcu, idx); |
e930bffe AA |
278 | |
279 | /* we've to flush the tlb before the pages can be freed */ | |
280 | if (need_tlb_flush) | |
281 | kvm_flush_remote_tlbs(kvm); | |
282 | ||
283 | } | |
284 | ||
3da0dd43 IE |
285 | static void kvm_mmu_notifier_change_pte(struct mmu_notifier *mn, |
286 | struct mm_struct *mm, | |
287 | unsigned long address, | |
288 | pte_t pte) | |
289 | { | |
290 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
bc6678a3 | 291 | int idx; |
3da0dd43 | 292 | |
bc6678a3 | 293 | idx = srcu_read_lock(&kvm->srcu); |
3da0dd43 IE |
294 | spin_lock(&kvm->mmu_lock); |
295 | kvm->mmu_notifier_seq++; | |
296 | kvm_set_spte_hva(kvm, address, pte); | |
297 | spin_unlock(&kvm->mmu_lock); | |
bc6678a3 | 298 | srcu_read_unlock(&kvm->srcu, idx); |
3da0dd43 IE |
299 | } |
300 | ||
e930bffe AA |
301 | static void kvm_mmu_notifier_invalidate_range_start(struct mmu_notifier *mn, |
302 | struct mm_struct *mm, | |
303 | unsigned long start, | |
304 | unsigned long end) | |
305 | { | |
306 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
bc6678a3 | 307 | int need_tlb_flush = 0, idx; |
e930bffe | 308 | |
bc6678a3 | 309 | idx = srcu_read_lock(&kvm->srcu); |
e930bffe AA |
310 | spin_lock(&kvm->mmu_lock); |
311 | /* | |
312 | * The count increase must become visible at unlock time as no | |
313 | * spte can be established without taking the mmu_lock and | |
314 | * count is also read inside the mmu_lock critical section. | |
315 | */ | |
316 | kvm->mmu_notifier_count++; | |
317 | for (; start < end; start += PAGE_SIZE) | |
318 | need_tlb_flush |= kvm_unmap_hva(kvm, start); | |
a4ee1ca4 | 319 | need_tlb_flush |= kvm->tlbs_dirty; |
e930bffe | 320 | spin_unlock(&kvm->mmu_lock); |
bc6678a3 | 321 | srcu_read_unlock(&kvm->srcu, idx); |
e930bffe AA |
322 | |
323 | /* we've to flush the tlb before the pages can be freed */ | |
324 | if (need_tlb_flush) | |
325 | kvm_flush_remote_tlbs(kvm); | |
326 | } | |
327 | ||
328 | static void kvm_mmu_notifier_invalidate_range_end(struct mmu_notifier *mn, | |
329 | struct mm_struct *mm, | |
330 | unsigned long start, | |
331 | unsigned long end) | |
332 | { | |
333 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
334 | ||
335 | spin_lock(&kvm->mmu_lock); | |
336 | /* | |
337 | * This sequence increase will notify the kvm page fault that | |
338 | * the page that is going to be mapped in the spte could have | |
339 | * been freed. | |
340 | */ | |
341 | kvm->mmu_notifier_seq++; | |
342 | /* | |
343 | * The above sequence increase must be visible before the | |
344 | * below count decrease but both values are read by the kvm | |
345 | * page fault under mmu_lock spinlock so we don't need to add | |
346 | * a smb_wmb() here in between the two. | |
347 | */ | |
348 | kvm->mmu_notifier_count--; | |
349 | spin_unlock(&kvm->mmu_lock); | |
350 | ||
351 | BUG_ON(kvm->mmu_notifier_count < 0); | |
352 | } | |
353 | ||
354 | static int kvm_mmu_notifier_clear_flush_young(struct mmu_notifier *mn, | |
355 | struct mm_struct *mm, | |
356 | unsigned long address) | |
357 | { | |
358 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
bc6678a3 | 359 | int young, idx; |
e930bffe | 360 | |
bc6678a3 | 361 | idx = srcu_read_lock(&kvm->srcu); |
e930bffe AA |
362 | spin_lock(&kvm->mmu_lock); |
363 | young = kvm_age_hva(kvm, address); | |
364 | spin_unlock(&kvm->mmu_lock); | |
bc6678a3 | 365 | srcu_read_unlock(&kvm->srcu, idx); |
e930bffe AA |
366 | |
367 | if (young) | |
368 | kvm_flush_remote_tlbs(kvm); | |
369 | ||
370 | return young; | |
371 | } | |
372 | ||
8ee53820 AA |
373 | static int kvm_mmu_notifier_test_young(struct mmu_notifier *mn, |
374 | struct mm_struct *mm, | |
375 | unsigned long address) | |
376 | { | |
377 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
378 | int young, idx; | |
379 | ||
380 | idx = srcu_read_lock(&kvm->srcu); | |
381 | spin_lock(&kvm->mmu_lock); | |
382 | young = kvm_test_age_hva(kvm, address); | |
383 | spin_unlock(&kvm->mmu_lock); | |
384 | srcu_read_unlock(&kvm->srcu, idx); | |
385 | ||
386 | return young; | |
387 | } | |
388 | ||
85db06e5 MT |
389 | static void kvm_mmu_notifier_release(struct mmu_notifier *mn, |
390 | struct mm_struct *mm) | |
391 | { | |
392 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
eda2beda LJ |
393 | int idx; |
394 | ||
395 | idx = srcu_read_lock(&kvm->srcu); | |
85db06e5 | 396 | kvm_arch_flush_shadow(kvm); |
eda2beda | 397 | srcu_read_unlock(&kvm->srcu, idx); |
85db06e5 MT |
398 | } |
399 | ||
e930bffe AA |
400 | static const struct mmu_notifier_ops kvm_mmu_notifier_ops = { |
401 | .invalidate_page = kvm_mmu_notifier_invalidate_page, | |
402 | .invalidate_range_start = kvm_mmu_notifier_invalidate_range_start, | |
403 | .invalidate_range_end = kvm_mmu_notifier_invalidate_range_end, | |
404 | .clear_flush_young = kvm_mmu_notifier_clear_flush_young, | |
8ee53820 | 405 | .test_young = kvm_mmu_notifier_test_young, |
3da0dd43 | 406 | .change_pte = kvm_mmu_notifier_change_pte, |
85db06e5 | 407 | .release = kvm_mmu_notifier_release, |
e930bffe | 408 | }; |
4c07b0a4 AK |
409 | |
410 | static int kvm_init_mmu_notifier(struct kvm *kvm) | |
411 | { | |
412 | kvm->mmu_notifier.ops = &kvm_mmu_notifier_ops; | |
413 | return mmu_notifier_register(&kvm->mmu_notifier, current->mm); | |
414 | } | |
415 | ||
416 | #else /* !(CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER) */ | |
417 | ||
418 | static int kvm_init_mmu_notifier(struct kvm *kvm) | |
419 | { | |
420 | return 0; | |
421 | } | |
422 | ||
e930bffe AA |
423 | #endif /* CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER */ |
424 | ||
f17abe9a | 425 | static struct kvm *kvm_create_vm(void) |
6aa8b732 | 426 | { |
d89f5eff JK |
427 | int r, i; |
428 | struct kvm *kvm = kvm_arch_alloc_vm(); | |
6aa8b732 | 429 | |
d89f5eff JK |
430 | if (!kvm) |
431 | return ERR_PTR(-ENOMEM); | |
432 | ||
433 | r = kvm_arch_init_vm(kvm); | |
434 | if (r) | |
435 | goto out_err_nodisable; | |
10474ae8 AG |
436 | |
437 | r = hardware_enable_all(); | |
438 | if (r) | |
439 | goto out_err_nodisable; | |
440 | ||
75858a84 AK |
441 | #ifdef CONFIG_HAVE_KVM_IRQCHIP |
442 | INIT_HLIST_HEAD(&kvm->mask_notifier_list); | |
136bdfee | 443 | INIT_HLIST_HEAD(&kvm->irq_ack_notifier_list); |
75858a84 | 444 | #endif |
6aa8b732 | 445 | |
46a26bf5 MT |
446 | r = -ENOMEM; |
447 | kvm->memslots = kzalloc(sizeof(struct kvm_memslots), GFP_KERNEL); | |
448 | if (!kvm->memslots) | |
57e7fbee | 449 | goto out_err_nosrcu; |
bc6678a3 | 450 | if (init_srcu_struct(&kvm->srcu)) |
57e7fbee | 451 | goto out_err_nosrcu; |
e93f8a0f MT |
452 | for (i = 0; i < KVM_NR_BUSES; i++) { |
453 | kvm->buses[i] = kzalloc(sizeof(struct kvm_io_bus), | |
454 | GFP_KERNEL); | |
57e7fbee | 455 | if (!kvm->buses[i]) |
e93f8a0f | 456 | goto out_err; |
e93f8a0f | 457 | } |
46a26bf5 | 458 | |
4c07b0a4 | 459 | r = kvm_init_mmu_notifier(kvm); |
57e7fbee | 460 | if (r) |
283d0c65 | 461 | goto out_err; |
e930bffe | 462 | |
6d4e4c4f AK |
463 | kvm->mm = current->mm; |
464 | atomic_inc(&kvm->mm->mm_count); | |
aaee2c94 | 465 | spin_lock_init(&kvm->mmu_lock); |
70e335e1 | 466 | raw_spin_lock_init(&kvm->requests_lock); |
d34e6b17 | 467 | kvm_eventfd_init(kvm); |
11ec2804 | 468 | mutex_init(&kvm->lock); |
60eead79 | 469 | mutex_init(&kvm->irq_lock); |
79fac95e | 470 | mutex_init(&kvm->slots_lock); |
d39f13b0 | 471 | atomic_set(&kvm->users_count, 1); |
5e58cfe4 RR |
472 | spin_lock(&kvm_lock); |
473 | list_add(&kvm->vm_list, &vm_list); | |
474 | spin_unlock(&kvm_lock); | |
d89f5eff | 475 | |
f17abe9a | 476 | return kvm; |
10474ae8 AG |
477 | |
478 | out_err: | |
57e7fbee JK |
479 | cleanup_srcu_struct(&kvm->srcu); |
480 | out_err_nosrcu: | |
10474ae8 AG |
481 | hardware_disable_all(); |
482 | out_err_nodisable: | |
e93f8a0f MT |
483 | for (i = 0; i < KVM_NR_BUSES; i++) |
484 | kfree(kvm->buses[i]); | |
46a26bf5 | 485 | kfree(kvm->memslots); |
d89f5eff | 486 | kvm_arch_free_vm(kvm); |
10474ae8 | 487 | return ERR_PTR(r); |
f17abe9a AK |
488 | } |
489 | ||
a36a57b1 TY |
490 | static void kvm_destroy_dirty_bitmap(struct kvm_memory_slot *memslot) |
491 | { | |
492 | if (!memslot->dirty_bitmap) | |
493 | return; | |
494 | ||
6f9e5c17 TY |
495 | if (2 * kvm_dirty_bitmap_bytes(memslot) > PAGE_SIZE) |
496 | vfree(memslot->dirty_bitmap_head); | |
497 | else | |
498 | kfree(memslot->dirty_bitmap_head); | |
499 | ||
a36a57b1 | 500 | memslot->dirty_bitmap = NULL; |
515a0127 | 501 | memslot->dirty_bitmap_head = NULL; |
a36a57b1 TY |
502 | } |
503 | ||
6aa8b732 AK |
504 | /* |
505 | * Free any memory in @free but not in @dont. | |
506 | */ | |
507 | static void kvm_free_physmem_slot(struct kvm_memory_slot *free, | |
508 | struct kvm_memory_slot *dont) | |
509 | { | |
ec04b260 JR |
510 | int i; |
511 | ||
290fc38d IE |
512 | if (!dont || free->rmap != dont->rmap) |
513 | vfree(free->rmap); | |
6aa8b732 AK |
514 | |
515 | if (!dont || free->dirty_bitmap != dont->dirty_bitmap) | |
a36a57b1 | 516 | kvm_destroy_dirty_bitmap(free); |
6aa8b732 | 517 | |
ec04b260 JR |
518 | |
519 | for (i = 0; i < KVM_NR_PAGE_SIZES - 1; ++i) { | |
520 | if (!dont || free->lpage_info[i] != dont->lpage_info[i]) { | |
521 | vfree(free->lpage_info[i]); | |
522 | free->lpage_info[i] = NULL; | |
523 | } | |
524 | } | |
05da4558 | 525 | |
6aa8b732 | 526 | free->npages = 0; |
8d4e1288 | 527 | free->rmap = NULL; |
6aa8b732 AK |
528 | } |
529 | ||
d19a9cd2 | 530 | void kvm_free_physmem(struct kvm *kvm) |
6aa8b732 AK |
531 | { |
532 | int i; | |
46a26bf5 MT |
533 | struct kvm_memslots *slots = kvm->memslots; |
534 | ||
535 | for (i = 0; i < slots->nmemslots; ++i) | |
536 | kvm_free_physmem_slot(&slots->memslots[i], NULL); | |
6aa8b732 | 537 | |
46a26bf5 | 538 | kfree(kvm->memslots); |
6aa8b732 AK |
539 | } |
540 | ||
f17abe9a AK |
541 | static void kvm_destroy_vm(struct kvm *kvm) |
542 | { | |
e93f8a0f | 543 | int i; |
6d4e4c4f AK |
544 | struct mm_struct *mm = kvm->mm; |
545 | ||
ad8ba2cd | 546 | kvm_arch_sync_events(kvm); |
133de902 AK |
547 | spin_lock(&kvm_lock); |
548 | list_del(&kvm->vm_list); | |
549 | spin_unlock(&kvm_lock); | |
399ec807 | 550 | kvm_free_irq_routing(kvm); |
e93f8a0f MT |
551 | for (i = 0; i < KVM_NR_BUSES; i++) |
552 | kvm_io_bus_destroy(kvm->buses[i]); | |
980da6ce | 553 | kvm_coalesced_mmio_free(kvm); |
e930bffe AA |
554 | #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER) |
555 | mmu_notifier_unregister(&kvm->mmu_notifier, kvm->mm); | |
f00be0ca GN |
556 | #else |
557 | kvm_arch_flush_shadow(kvm); | |
5f94c174 | 558 | #endif |
d19a9cd2 | 559 | kvm_arch_destroy_vm(kvm); |
d89f5eff JK |
560 | kvm_free_physmem(kvm); |
561 | cleanup_srcu_struct(&kvm->srcu); | |
562 | kvm_arch_free_vm(kvm); | |
10474ae8 | 563 | hardware_disable_all(); |
6d4e4c4f | 564 | mmdrop(mm); |
f17abe9a AK |
565 | } |
566 | ||
d39f13b0 IE |
567 | void kvm_get_kvm(struct kvm *kvm) |
568 | { | |
569 | atomic_inc(&kvm->users_count); | |
570 | } | |
571 | EXPORT_SYMBOL_GPL(kvm_get_kvm); | |
572 | ||
573 | void kvm_put_kvm(struct kvm *kvm) | |
574 | { | |
575 | if (atomic_dec_and_test(&kvm->users_count)) | |
576 | kvm_destroy_vm(kvm); | |
577 | } | |
578 | EXPORT_SYMBOL_GPL(kvm_put_kvm); | |
579 | ||
580 | ||
f17abe9a AK |
581 | static int kvm_vm_release(struct inode *inode, struct file *filp) |
582 | { | |
583 | struct kvm *kvm = filp->private_data; | |
584 | ||
721eecbf GH |
585 | kvm_irqfd_release(kvm); |
586 | ||
d39f13b0 | 587 | kvm_put_kvm(kvm); |
6aa8b732 AK |
588 | return 0; |
589 | } | |
590 | ||
515a0127 TY |
591 | /* |
592 | * Allocation size is twice as large as the actual dirty bitmap size. | |
593 | * This makes it possible to do double buffering: see x86's | |
594 | * kvm_vm_ioctl_get_dirty_log(). | |
595 | */ | |
a36a57b1 TY |
596 | static int kvm_create_dirty_bitmap(struct kvm_memory_slot *memslot) |
597 | { | |
515a0127 | 598 | unsigned long dirty_bytes = 2 * kvm_dirty_bitmap_bytes(memslot); |
a36a57b1 | 599 | |
6f9e5c17 TY |
600 | if (dirty_bytes > PAGE_SIZE) |
601 | memslot->dirty_bitmap = vzalloc(dirty_bytes); | |
602 | else | |
603 | memslot->dirty_bitmap = kzalloc(dirty_bytes, GFP_KERNEL); | |
604 | ||
a36a57b1 TY |
605 | if (!memslot->dirty_bitmap) |
606 | return -ENOMEM; | |
607 | ||
515a0127 | 608 | memslot->dirty_bitmap_head = memslot->dirty_bitmap; |
a36a57b1 TY |
609 | return 0; |
610 | } | |
611 | ||
6aa8b732 AK |
612 | /* |
613 | * Allocate some memory and give it an address in the guest physical address | |
614 | * space. | |
615 | * | |
616 | * Discontiguous memory is allowed, mostly for framebuffers. | |
f78e0e2e | 617 | * |
10589a46 | 618 | * Must be called holding mmap_sem for write. |
6aa8b732 | 619 | */ |
f78e0e2e SY |
620 | int __kvm_set_memory_region(struct kvm *kvm, |
621 | struct kvm_userspace_memory_region *mem, | |
622 | int user_alloc) | |
6aa8b732 | 623 | { |
bc6678a3 | 624 | int r, flush_shadow = 0; |
6aa8b732 | 625 | gfn_t base_gfn; |
28bcb112 HC |
626 | unsigned long npages; |
627 | unsigned long i; | |
6aa8b732 AK |
628 | struct kvm_memory_slot *memslot; |
629 | struct kvm_memory_slot old, new; | |
bc6678a3 | 630 | struct kvm_memslots *slots, *old_memslots; |
6aa8b732 AK |
631 | |
632 | r = -EINVAL; | |
633 | /* General sanity checks */ | |
634 | if (mem->memory_size & (PAGE_SIZE - 1)) | |
635 | goto out; | |
636 | if (mem->guest_phys_addr & (PAGE_SIZE - 1)) | |
637 | goto out; | |
e7cacd40 | 638 | if (user_alloc && (mem->userspace_addr & (PAGE_SIZE - 1))) |
78749809 | 639 | goto out; |
e0d62c7f | 640 | if (mem->slot >= KVM_MEMORY_SLOTS + KVM_PRIVATE_MEM_SLOTS) |
6aa8b732 AK |
641 | goto out; |
642 | if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr) | |
643 | goto out; | |
644 | ||
46a26bf5 | 645 | memslot = &kvm->memslots->memslots[mem->slot]; |
6aa8b732 AK |
646 | base_gfn = mem->guest_phys_addr >> PAGE_SHIFT; |
647 | npages = mem->memory_size >> PAGE_SHIFT; | |
648 | ||
660c22c4 TY |
649 | r = -EINVAL; |
650 | if (npages > KVM_MEM_MAX_NR_PAGES) | |
651 | goto out; | |
652 | ||
6aa8b732 AK |
653 | if (!npages) |
654 | mem->flags &= ~KVM_MEM_LOG_DIRTY_PAGES; | |
655 | ||
6aa8b732 AK |
656 | new = old = *memslot; |
657 | ||
e36d96f7 | 658 | new.id = mem->slot; |
6aa8b732 AK |
659 | new.base_gfn = base_gfn; |
660 | new.npages = npages; | |
661 | new.flags = mem->flags; | |
662 | ||
663 | /* Disallow changing a memory slot's size. */ | |
664 | r = -EINVAL; | |
665 | if (npages && old.npages && npages != old.npages) | |
f78e0e2e | 666 | goto out_free; |
6aa8b732 AK |
667 | |
668 | /* Check for overlaps */ | |
669 | r = -EEXIST; | |
670 | for (i = 0; i < KVM_MEMORY_SLOTS; ++i) { | |
46a26bf5 | 671 | struct kvm_memory_slot *s = &kvm->memslots->memslots[i]; |
6aa8b732 | 672 | |
4cd481f6 | 673 | if (s == memslot || !s->npages) |
6aa8b732 AK |
674 | continue; |
675 | if (!((base_gfn + npages <= s->base_gfn) || | |
676 | (base_gfn >= s->base_gfn + s->npages))) | |
f78e0e2e | 677 | goto out_free; |
6aa8b732 | 678 | } |
6aa8b732 | 679 | |
6aa8b732 AK |
680 | /* Free page dirty bitmap if unneeded */ |
681 | if (!(new.flags & KVM_MEM_LOG_DIRTY_PAGES)) | |
8b6d44c7 | 682 | new.dirty_bitmap = NULL; |
6aa8b732 AK |
683 | |
684 | r = -ENOMEM; | |
685 | ||
686 | /* Allocate if a slot is being created */ | |
eff0114a | 687 | #ifndef CONFIG_S390 |
8d4e1288 | 688 | if (npages && !new.rmap) { |
26535037 | 689 | new.rmap = vzalloc(npages * sizeof(*new.rmap)); |
290fc38d IE |
690 | |
691 | if (!new.rmap) | |
f78e0e2e | 692 | goto out_free; |
290fc38d | 693 | |
80b14b5b | 694 | new.user_alloc = user_alloc; |
bc6678a3 | 695 | new.userspace_addr = mem->userspace_addr; |
6aa8b732 | 696 | } |
ec04b260 JR |
697 | if (!npages) |
698 | goto skip_lpage; | |
05da4558 | 699 | |
ec04b260 | 700 | for (i = 0; i < KVM_NR_PAGE_SIZES - 1; ++i) { |
28bcb112 HC |
701 | unsigned long ugfn; |
702 | unsigned long j; | |
703 | int lpages; | |
ec04b260 | 704 | int level = i + 2; |
05da4558 | 705 | |
ec04b260 JR |
706 | /* Avoid unused variable warning if no large pages */ |
707 | (void)level; | |
708 | ||
709 | if (new.lpage_info[i]) | |
710 | continue; | |
711 | ||
82855413 JR |
712 | lpages = 1 + ((base_gfn + npages - 1) |
713 | >> KVM_HPAGE_GFN_SHIFT(level)); | |
714 | lpages -= base_gfn >> KVM_HPAGE_GFN_SHIFT(level); | |
ec04b260 | 715 | |
26535037 | 716 | new.lpage_info[i] = vzalloc(lpages * sizeof(*new.lpage_info[i])); |
ec04b260 JR |
717 | |
718 | if (!new.lpage_info[i]) | |
05da4558 MT |
719 | goto out_free; |
720 | ||
82855413 | 721 | if (base_gfn & (KVM_PAGES_PER_HPAGE(level) - 1)) |
ec04b260 | 722 | new.lpage_info[i][0].write_count = 1; |
82855413 | 723 | if ((base_gfn+npages) & (KVM_PAGES_PER_HPAGE(level) - 1)) |
ec04b260 | 724 | new.lpage_info[i][lpages - 1].write_count = 1; |
ac04527f AK |
725 | ugfn = new.userspace_addr >> PAGE_SHIFT; |
726 | /* | |
727 | * If the gfn and userspace address are not aligned wrt each | |
54dee993 MT |
728 | * other, or if explicitly asked to, disable large page |
729 | * support for this slot | |
ac04527f | 730 | */ |
ec04b260 | 731 | if ((base_gfn ^ ugfn) & (KVM_PAGES_PER_HPAGE(level) - 1) || |
54dee993 | 732 | !largepages_enabled) |
ec04b260 JR |
733 | for (j = 0; j < lpages; ++j) |
734 | new.lpage_info[i][j].write_count = 1; | |
05da4558 | 735 | } |
6aa8b732 | 736 | |
ec04b260 JR |
737 | skip_lpage: |
738 | ||
6aa8b732 AK |
739 | /* Allocate page dirty bitmap if needed */ |
740 | if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) { | |
a36a57b1 | 741 | if (kvm_create_dirty_bitmap(&new) < 0) |
f78e0e2e | 742 | goto out_free; |
bc6678a3 | 743 | /* destroy any largepage mappings for dirty tracking */ |
e244584f | 744 | if (old.npages) |
bc6678a3 | 745 | flush_shadow = 1; |
6aa8b732 | 746 | } |
3eea8437 CB |
747 | #else /* not defined CONFIG_S390 */ |
748 | new.user_alloc = user_alloc; | |
749 | if (user_alloc) | |
750 | new.userspace_addr = mem->userspace_addr; | |
eff0114a | 751 | #endif /* not defined CONFIG_S390 */ |
6aa8b732 | 752 | |
bc6678a3 MT |
753 | if (!npages) { |
754 | r = -ENOMEM; | |
755 | slots = kzalloc(sizeof(struct kvm_memslots), GFP_KERNEL); | |
756 | if (!slots) | |
757 | goto out_free; | |
758 | memcpy(slots, kvm->memslots, sizeof(struct kvm_memslots)); | |
759 | if (mem->slot >= slots->nmemslots) | |
760 | slots->nmemslots = mem->slot + 1; | |
49c7754c | 761 | slots->generation++; |
bc6678a3 MT |
762 | slots->memslots[mem->slot].flags |= KVM_MEMSLOT_INVALID; |
763 | ||
764 | old_memslots = kvm->memslots; | |
765 | rcu_assign_pointer(kvm->memslots, slots); | |
766 | synchronize_srcu_expedited(&kvm->srcu); | |
767 | /* From this point no new shadow pages pointing to a deleted | |
768 | * memslot will be created. | |
769 | * | |
770 | * validation of sp->gfn happens in: | |
771 | * - gfn_to_hva (kvm_read_guest, gfn_to_pfn) | |
772 | * - kvm_is_visible_gfn (mmu_check_roots) | |
773 | */ | |
34d4cb8f | 774 | kvm_arch_flush_shadow(kvm); |
bc6678a3 MT |
775 | kfree(old_memslots); |
776 | } | |
34d4cb8f | 777 | |
f7784b8e MT |
778 | r = kvm_arch_prepare_memory_region(kvm, &new, old, mem, user_alloc); |
779 | if (r) | |
780 | goto out_free; | |
781 | ||
bc6678a3 MT |
782 | /* map the pages in iommu page table */ |
783 | if (npages) { | |
784 | r = kvm_iommu_map_pages(kvm, &new); | |
785 | if (r) | |
786 | goto out_free; | |
787 | } | |
604b38ac | 788 | |
bc6678a3 MT |
789 | r = -ENOMEM; |
790 | slots = kzalloc(sizeof(struct kvm_memslots), GFP_KERNEL); | |
791 | if (!slots) | |
792 | goto out_free; | |
793 | memcpy(slots, kvm->memslots, sizeof(struct kvm_memslots)); | |
794 | if (mem->slot >= slots->nmemslots) | |
795 | slots->nmemslots = mem->slot + 1; | |
49c7754c | 796 | slots->generation++; |
bc6678a3 MT |
797 | |
798 | /* actual memory is freed via old in kvm_free_physmem_slot below */ | |
799 | if (!npages) { | |
800 | new.rmap = NULL; | |
801 | new.dirty_bitmap = NULL; | |
802 | for (i = 0; i < KVM_NR_PAGE_SIZES - 1; ++i) | |
803 | new.lpage_info[i] = NULL; | |
804 | } | |
805 | ||
806 | slots->memslots[mem->slot] = new; | |
807 | old_memslots = kvm->memslots; | |
808 | rcu_assign_pointer(kvm->memslots, slots); | |
809 | synchronize_srcu_expedited(&kvm->srcu); | |
3ad82a7e | 810 | |
f7784b8e | 811 | kvm_arch_commit_memory_region(kvm, mem, old, user_alloc); |
82ce2c96 | 812 | |
bc6678a3 MT |
813 | kvm_free_physmem_slot(&old, &new); |
814 | kfree(old_memslots); | |
815 | ||
816 | if (flush_shadow) | |
817 | kvm_arch_flush_shadow(kvm); | |
818 | ||
6aa8b732 AK |
819 | return 0; |
820 | ||
f78e0e2e | 821 | out_free: |
6aa8b732 AK |
822 | kvm_free_physmem_slot(&new, &old); |
823 | out: | |
824 | return r; | |
210c7c4d IE |
825 | |
826 | } | |
f78e0e2e SY |
827 | EXPORT_SYMBOL_GPL(__kvm_set_memory_region); |
828 | ||
829 | int kvm_set_memory_region(struct kvm *kvm, | |
830 | struct kvm_userspace_memory_region *mem, | |
831 | int user_alloc) | |
832 | { | |
833 | int r; | |
834 | ||
79fac95e | 835 | mutex_lock(&kvm->slots_lock); |
f78e0e2e | 836 | r = __kvm_set_memory_region(kvm, mem, user_alloc); |
79fac95e | 837 | mutex_unlock(&kvm->slots_lock); |
f78e0e2e SY |
838 | return r; |
839 | } | |
210c7c4d IE |
840 | EXPORT_SYMBOL_GPL(kvm_set_memory_region); |
841 | ||
1fe779f8 CO |
842 | int kvm_vm_ioctl_set_memory_region(struct kvm *kvm, |
843 | struct | |
844 | kvm_userspace_memory_region *mem, | |
845 | int user_alloc) | |
210c7c4d | 846 | { |
e0d62c7f IE |
847 | if (mem->slot >= KVM_MEMORY_SLOTS) |
848 | return -EINVAL; | |
210c7c4d | 849 | return kvm_set_memory_region(kvm, mem, user_alloc); |
6aa8b732 AK |
850 | } |
851 | ||
5bb064dc ZX |
852 | int kvm_get_dirty_log(struct kvm *kvm, |
853 | struct kvm_dirty_log *log, int *is_dirty) | |
6aa8b732 AK |
854 | { |
855 | struct kvm_memory_slot *memslot; | |
856 | int r, i; | |
87bf6e7d | 857 | unsigned long n; |
6aa8b732 AK |
858 | unsigned long any = 0; |
859 | ||
6aa8b732 AK |
860 | r = -EINVAL; |
861 | if (log->slot >= KVM_MEMORY_SLOTS) | |
862 | goto out; | |
863 | ||
46a26bf5 | 864 | memslot = &kvm->memslots->memslots[log->slot]; |
6aa8b732 AK |
865 | r = -ENOENT; |
866 | if (!memslot->dirty_bitmap) | |
867 | goto out; | |
868 | ||
87bf6e7d | 869 | n = kvm_dirty_bitmap_bytes(memslot); |
6aa8b732 | 870 | |
cd1a4a98 | 871 | for (i = 0; !any && i < n/sizeof(long); ++i) |
6aa8b732 AK |
872 | any = memslot->dirty_bitmap[i]; |
873 | ||
874 | r = -EFAULT; | |
875 | if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n)) | |
876 | goto out; | |
877 | ||
5bb064dc ZX |
878 | if (any) |
879 | *is_dirty = 1; | |
6aa8b732 AK |
880 | |
881 | r = 0; | |
6aa8b732 | 882 | out: |
6aa8b732 AK |
883 | return r; |
884 | } | |
885 | ||
54dee993 MT |
886 | void kvm_disable_largepages(void) |
887 | { | |
888 | largepages_enabled = false; | |
889 | } | |
890 | EXPORT_SYMBOL_GPL(kvm_disable_largepages); | |
891 | ||
cea7bb21 IE |
892 | int is_error_page(struct page *page) |
893 | { | |
edba23e5 | 894 | return page == bad_page || page == hwpoison_page || page == fault_page; |
cea7bb21 IE |
895 | } |
896 | EXPORT_SYMBOL_GPL(is_error_page); | |
897 | ||
35149e21 AL |
898 | int is_error_pfn(pfn_t pfn) |
899 | { | |
edba23e5 | 900 | return pfn == bad_pfn || pfn == hwpoison_pfn || pfn == fault_pfn; |
35149e21 AL |
901 | } |
902 | EXPORT_SYMBOL_GPL(is_error_pfn); | |
903 | ||
bf998156 HY |
904 | int is_hwpoison_pfn(pfn_t pfn) |
905 | { | |
906 | return pfn == hwpoison_pfn; | |
907 | } | |
908 | EXPORT_SYMBOL_GPL(is_hwpoison_pfn); | |
909 | ||
edba23e5 GN |
910 | int is_fault_pfn(pfn_t pfn) |
911 | { | |
912 | return pfn == fault_pfn; | |
913 | } | |
914 | EXPORT_SYMBOL_GPL(is_fault_pfn); | |
915 | ||
f9d46eb0 IE |
916 | static inline unsigned long bad_hva(void) |
917 | { | |
918 | return PAGE_OFFSET; | |
919 | } | |
920 | ||
921 | int kvm_is_error_hva(unsigned long addr) | |
922 | { | |
923 | return addr == bad_hva(); | |
924 | } | |
925 | EXPORT_SYMBOL_GPL(kvm_is_error_hva); | |
926 | ||
49c7754c GN |
927 | static struct kvm_memory_slot *__gfn_to_memslot(struct kvm_memslots *slots, |
928 | gfn_t gfn) | |
6aa8b732 AK |
929 | { |
930 | int i; | |
931 | ||
46a26bf5 MT |
932 | for (i = 0; i < slots->nmemslots; ++i) { |
933 | struct kvm_memory_slot *memslot = &slots->memslots[i]; | |
6aa8b732 AK |
934 | |
935 | if (gfn >= memslot->base_gfn | |
936 | && gfn < memslot->base_gfn + memslot->npages) | |
937 | return memslot; | |
938 | } | |
8b6d44c7 | 939 | return NULL; |
6aa8b732 | 940 | } |
49c7754c GN |
941 | |
942 | struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn) | |
943 | { | |
944 | return __gfn_to_memslot(kvm_memslots(kvm), gfn); | |
945 | } | |
a1f4d395 | 946 | EXPORT_SYMBOL_GPL(gfn_to_memslot); |
6aa8b732 | 947 | |
e0d62c7f IE |
948 | int kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn) |
949 | { | |
950 | int i; | |
90d83dc3 | 951 | struct kvm_memslots *slots = kvm_memslots(kvm); |
e0d62c7f | 952 | |
e0d62c7f | 953 | for (i = 0; i < KVM_MEMORY_SLOTS; ++i) { |
46a26bf5 | 954 | struct kvm_memory_slot *memslot = &slots->memslots[i]; |
e0d62c7f | 955 | |
bc6678a3 MT |
956 | if (memslot->flags & KVM_MEMSLOT_INVALID) |
957 | continue; | |
958 | ||
e0d62c7f IE |
959 | if (gfn >= memslot->base_gfn |
960 | && gfn < memslot->base_gfn + memslot->npages) | |
961 | return 1; | |
962 | } | |
963 | return 0; | |
964 | } | |
965 | EXPORT_SYMBOL_GPL(kvm_is_visible_gfn); | |
966 | ||
8f0b1ab6 JR |
967 | unsigned long kvm_host_page_size(struct kvm *kvm, gfn_t gfn) |
968 | { | |
969 | struct vm_area_struct *vma; | |
970 | unsigned long addr, size; | |
971 | ||
972 | size = PAGE_SIZE; | |
973 | ||
974 | addr = gfn_to_hva(kvm, gfn); | |
975 | if (kvm_is_error_hva(addr)) | |
976 | return PAGE_SIZE; | |
977 | ||
978 | down_read(¤t->mm->mmap_sem); | |
979 | vma = find_vma(current->mm, addr); | |
980 | if (!vma) | |
981 | goto out; | |
982 | ||
983 | size = vma_kernel_pagesize(vma); | |
984 | ||
985 | out: | |
986 | up_read(¤t->mm->mmap_sem); | |
987 | ||
988 | return size; | |
989 | } | |
990 | ||
bc6678a3 MT |
991 | int memslot_id(struct kvm *kvm, gfn_t gfn) |
992 | { | |
993 | int i; | |
90d83dc3 | 994 | struct kvm_memslots *slots = kvm_memslots(kvm); |
bc6678a3 MT |
995 | struct kvm_memory_slot *memslot = NULL; |
996 | ||
bc6678a3 MT |
997 | for (i = 0; i < slots->nmemslots; ++i) { |
998 | memslot = &slots->memslots[i]; | |
999 | ||
1000 | if (gfn >= memslot->base_gfn | |
1001 | && gfn < memslot->base_gfn + memslot->npages) | |
1002 | break; | |
1003 | } | |
1004 | ||
1005 | return memslot - slots->memslots; | |
1006 | } | |
1007 | ||
49c7754c | 1008 | static unsigned long gfn_to_hva_many(struct kvm_memory_slot *slot, gfn_t gfn, |
48987781 | 1009 | gfn_t *nr_pages) |
539cb660 | 1010 | { |
bc6678a3 | 1011 | if (!slot || slot->flags & KVM_MEMSLOT_INVALID) |
539cb660 | 1012 | return bad_hva(); |
48987781 XG |
1013 | |
1014 | if (nr_pages) | |
1015 | *nr_pages = slot->npages - (gfn - slot->base_gfn); | |
1016 | ||
f5c98031 | 1017 | return gfn_to_hva_memslot(slot, gfn); |
539cb660 | 1018 | } |
48987781 XG |
1019 | |
1020 | unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn) | |
1021 | { | |
49c7754c | 1022 | return gfn_to_hva_many(gfn_to_memslot(kvm, gfn), gfn, NULL); |
48987781 | 1023 | } |
0d150298 | 1024 | EXPORT_SYMBOL_GPL(gfn_to_hva); |
539cb660 | 1025 | |
8030089f GN |
1026 | static pfn_t get_fault_pfn(void) |
1027 | { | |
1028 | get_page(fault_page); | |
1029 | return fault_pfn; | |
1030 | } | |
1031 | ||
af585b92 | 1032 | static pfn_t hva_to_pfn(struct kvm *kvm, unsigned long addr, bool atomic, |
612819c3 | 1033 | bool *async, bool write_fault, bool *writable) |
954bbbc2 | 1034 | { |
8d4e1288 | 1035 | struct page *page[1]; |
af585b92 | 1036 | int npages = 0; |
2e2e3738 | 1037 | pfn_t pfn; |
954bbbc2 | 1038 | |
af585b92 GN |
1039 | /* we can do it either atomically or asynchronously, not both */ |
1040 | BUG_ON(atomic && async); | |
1041 | ||
612819c3 MT |
1042 | BUG_ON(!write_fault && !writable); |
1043 | ||
1044 | if (writable) | |
1045 | *writable = true; | |
1046 | ||
af585b92 | 1047 | if (atomic || async) |
887c08ac | 1048 | npages = __get_user_pages_fast(addr, 1, 1, page); |
af585b92 GN |
1049 | |
1050 | if (unlikely(npages != 1) && !atomic) { | |
887c08ac | 1051 | might_sleep(); |
612819c3 MT |
1052 | |
1053 | if (writable) | |
1054 | *writable = write_fault; | |
1055 | ||
1056 | npages = get_user_pages_fast(addr, 1, write_fault, page); | |
1057 | ||
1058 | /* map read fault as writable if possible */ | |
1059 | if (unlikely(!write_fault) && npages == 1) { | |
1060 | struct page *wpage[1]; | |
1061 | ||
1062 | npages = __get_user_pages_fast(addr, 1, 1, wpage); | |
1063 | if (npages == 1) { | |
1064 | *writable = true; | |
1065 | put_page(page[0]); | |
1066 | page[0] = wpage[0]; | |
1067 | } | |
1068 | npages = 1; | |
1069 | } | |
887c08ac | 1070 | } |
539cb660 | 1071 | |
2e2e3738 AL |
1072 | if (unlikely(npages != 1)) { |
1073 | struct vm_area_struct *vma; | |
1074 | ||
887c08ac | 1075 | if (atomic) |
8030089f | 1076 | return get_fault_pfn(); |
887c08ac | 1077 | |
bbeb3406 | 1078 | down_read(¤t->mm->mmap_sem); |
bf998156 | 1079 | if (is_hwpoison_address(addr)) { |
bbeb3406 | 1080 | up_read(¤t->mm->mmap_sem); |
bf998156 HY |
1081 | get_page(hwpoison_page); |
1082 | return page_to_pfn(hwpoison_page); | |
1083 | } | |
1084 | ||
8030089f | 1085 | vma = find_vma_intersection(current->mm, addr, addr+1); |
4c2155ce | 1086 | |
8030089f GN |
1087 | if (vma == NULL) |
1088 | pfn = get_fault_pfn(); | |
1089 | else if ((vma->vm_flags & VM_PFNMAP)) { | |
1090 | pfn = ((addr - vma->vm_start) >> PAGE_SHIFT) + | |
1091 | vma->vm_pgoff; | |
1092 | BUG_ON(!kvm_is_mmio_pfn(pfn)); | |
1093 | } else { | |
1094 | if (async && (vma->vm_flags & VM_WRITE)) | |
af585b92 | 1095 | *async = true; |
8030089f | 1096 | pfn = get_fault_pfn(); |
2e2e3738 | 1097 | } |
4c2155ce | 1098 | up_read(¤t->mm->mmap_sem); |
2e2e3738 AL |
1099 | } else |
1100 | pfn = page_to_pfn(page[0]); | |
8d4e1288 | 1101 | |
2e2e3738 | 1102 | return pfn; |
35149e21 AL |
1103 | } |
1104 | ||
887c08ac XG |
1105 | pfn_t hva_to_pfn_atomic(struct kvm *kvm, unsigned long addr) |
1106 | { | |
612819c3 | 1107 | return hva_to_pfn(kvm, addr, true, NULL, true, NULL); |
887c08ac XG |
1108 | } |
1109 | EXPORT_SYMBOL_GPL(hva_to_pfn_atomic); | |
1110 | ||
612819c3 MT |
1111 | static pfn_t __gfn_to_pfn(struct kvm *kvm, gfn_t gfn, bool atomic, bool *async, |
1112 | bool write_fault, bool *writable) | |
506f0d6f MT |
1113 | { |
1114 | unsigned long addr; | |
1115 | ||
af585b92 GN |
1116 | if (async) |
1117 | *async = false; | |
1118 | ||
506f0d6f MT |
1119 | addr = gfn_to_hva(kvm, gfn); |
1120 | if (kvm_is_error_hva(addr)) { | |
1121 | get_page(bad_page); | |
1122 | return page_to_pfn(bad_page); | |
1123 | } | |
1124 | ||
612819c3 | 1125 | return hva_to_pfn(kvm, addr, atomic, async, write_fault, writable); |
365fb3fd XG |
1126 | } |
1127 | ||
1128 | pfn_t gfn_to_pfn_atomic(struct kvm *kvm, gfn_t gfn) | |
1129 | { | |
612819c3 | 1130 | return __gfn_to_pfn(kvm, gfn, true, NULL, true, NULL); |
365fb3fd XG |
1131 | } |
1132 | EXPORT_SYMBOL_GPL(gfn_to_pfn_atomic); | |
1133 | ||
612819c3 MT |
1134 | pfn_t gfn_to_pfn_async(struct kvm *kvm, gfn_t gfn, bool *async, |
1135 | bool write_fault, bool *writable) | |
af585b92 | 1136 | { |
612819c3 | 1137 | return __gfn_to_pfn(kvm, gfn, false, async, write_fault, writable); |
af585b92 GN |
1138 | } |
1139 | EXPORT_SYMBOL_GPL(gfn_to_pfn_async); | |
1140 | ||
365fb3fd XG |
1141 | pfn_t gfn_to_pfn(struct kvm *kvm, gfn_t gfn) |
1142 | { | |
612819c3 | 1143 | return __gfn_to_pfn(kvm, gfn, false, NULL, true, NULL); |
506f0d6f | 1144 | } |
35149e21 AL |
1145 | EXPORT_SYMBOL_GPL(gfn_to_pfn); |
1146 | ||
612819c3 MT |
1147 | pfn_t gfn_to_pfn_prot(struct kvm *kvm, gfn_t gfn, bool write_fault, |
1148 | bool *writable) | |
1149 | { | |
1150 | return __gfn_to_pfn(kvm, gfn, false, NULL, write_fault, writable); | |
1151 | } | |
1152 | EXPORT_SYMBOL_GPL(gfn_to_pfn_prot); | |
1153 | ||
506f0d6f MT |
1154 | pfn_t gfn_to_pfn_memslot(struct kvm *kvm, |
1155 | struct kvm_memory_slot *slot, gfn_t gfn) | |
1156 | { | |
1157 | unsigned long addr = gfn_to_hva_memslot(slot, gfn); | |
612819c3 | 1158 | return hva_to_pfn(kvm, addr, false, NULL, true, NULL); |
506f0d6f MT |
1159 | } |
1160 | ||
48987781 XG |
1161 | int gfn_to_page_many_atomic(struct kvm *kvm, gfn_t gfn, struct page **pages, |
1162 | int nr_pages) | |
1163 | { | |
1164 | unsigned long addr; | |
1165 | gfn_t entry; | |
1166 | ||
49c7754c | 1167 | addr = gfn_to_hva_many(gfn_to_memslot(kvm, gfn), gfn, &entry); |
48987781 XG |
1168 | if (kvm_is_error_hva(addr)) |
1169 | return -1; | |
1170 | ||
1171 | if (entry < nr_pages) | |
1172 | return 0; | |
1173 | ||
1174 | return __get_user_pages_fast(addr, nr_pages, 1, pages); | |
1175 | } | |
1176 | EXPORT_SYMBOL_GPL(gfn_to_page_many_atomic); | |
1177 | ||
35149e21 AL |
1178 | struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn) |
1179 | { | |
2e2e3738 AL |
1180 | pfn_t pfn; |
1181 | ||
1182 | pfn = gfn_to_pfn(kvm, gfn); | |
c77fb9dc | 1183 | if (!kvm_is_mmio_pfn(pfn)) |
2e2e3738 AL |
1184 | return pfn_to_page(pfn); |
1185 | ||
c77fb9dc | 1186 | WARN_ON(kvm_is_mmio_pfn(pfn)); |
2e2e3738 AL |
1187 | |
1188 | get_page(bad_page); | |
1189 | return bad_page; | |
954bbbc2 | 1190 | } |
aab61cc0 | 1191 | |
954bbbc2 AK |
1192 | EXPORT_SYMBOL_GPL(gfn_to_page); |
1193 | ||
b4231d61 IE |
1194 | void kvm_release_page_clean(struct page *page) |
1195 | { | |
35149e21 | 1196 | kvm_release_pfn_clean(page_to_pfn(page)); |
b4231d61 IE |
1197 | } |
1198 | EXPORT_SYMBOL_GPL(kvm_release_page_clean); | |
1199 | ||
35149e21 AL |
1200 | void kvm_release_pfn_clean(pfn_t pfn) |
1201 | { | |
c77fb9dc | 1202 | if (!kvm_is_mmio_pfn(pfn)) |
2e2e3738 | 1203 | put_page(pfn_to_page(pfn)); |
35149e21 AL |
1204 | } |
1205 | EXPORT_SYMBOL_GPL(kvm_release_pfn_clean); | |
1206 | ||
b4231d61 | 1207 | void kvm_release_page_dirty(struct page *page) |
8a7ae055 | 1208 | { |
35149e21 AL |
1209 | kvm_release_pfn_dirty(page_to_pfn(page)); |
1210 | } | |
1211 | EXPORT_SYMBOL_GPL(kvm_release_page_dirty); | |
1212 | ||
1213 | void kvm_release_pfn_dirty(pfn_t pfn) | |
1214 | { | |
1215 | kvm_set_pfn_dirty(pfn); | |
1216 | kvm_release_pfn_clean(pfn); | |
1217 | } | |
1218 | EXPORT_SYMBOL_GPL(kvm_release_pfn_dirty); | |
1219 | ||
1220 | void kvm_set_page_dirty(struct page *page) | |
1221 | { | |
1222 | kvm_set_pfn_dirty(page_to_pfn(page)); | |
1223 | } | |
1224 | EXPORT_SYMBOL_GPL(kvm_set_page_dirty); | |
1225 | ||
1226 | void kvm_set_pfn_dirty(pfn_t pfn) | |
1227 | { | |
c77fb9dc | 1228 | if (!kvm_is_mmio_pfn(pfn)) { |
2e2e3738 AL |
1229 | struct page *page = pfn_to_page(pfn); |
1230 | if (!PageReserved(page)) | |
1231 | SetPageDirty(page); | |
1232 | } | |
8a7ae055 | 1233 | } |
35149e21 AL |
1234 | EXPORT_SYMBOL_GPL(kvm_set_pfn_dirty); |
1235 | ||
1236 | void kvm_set_pfn_accessed(pfn_t pfn) | |
1237 | { | |
c77fb9dc | 1238 | if (!kvm_is_mmio_pfn(pfn)) |
2e2e3738 | 1239 | mark_page_accessed(pfn_to_page(pfn)); |
35149e21 AL |
1240 | } |
1241 | EXPORT_SYMBOL_GPL(kvm_set_pfn_accessed); | |
1242 | ||
1243 | void kvm_get_pfn(pfn_t pfn) | |
1244 | { | |
c77fb9dc | 1245 | if (!kvm_is_mmio_pfn(pfn)) |
2e2e3738 | 1246 | get_page(pfn_to_page(pfn)); |
35149e21 AL |
1247 | } |
1248 | EXPORT_SYMBOL_GPL(kvm_get_pfn); | |
8a7ae055 | 1249 | |
195aefde IE |
1250 | static int next_segment(unsigned long len, int offset) |
1251 | { | |
1252 | if (len > PAGE_SIZE - offset) | |
1253 | return PAGE_SIZE - offset; | |
1254 | else | |
1255 | return len; | |
1256 | } | |
1257 | ||
1258 | int kvm_read_guest_page(struct kvm *kvm, gfn_t gfn, void *data, int offset, | |
1259 | int len) | |
1260 | { | |
e0506bcb IE |
1261 | int r; |
1262 | unsigned long addr; | |
195aefde | 1263 | |
e0506bcb IE |
1264 | addr = gfn_to_hva(kvm, gfn); |
1265 | if (kvm_is_error_hva(addr)) | |
1266 | return -EFAULT; | |
1267 | r = copy_from_user(data, (void __user *)addr + offset, len); | |
1268 | if (r) | |
195aefde | 1269 | return -EFAULT; |
195aefde IE |
1270 | return 0; |
1271 | } | |
1272 | EXPORT_SYMBOL_GPL(kvm_read_guest_page); | |
1273 | ||
1274 | int kvm_read_guest(struct kvm *kvm, gpa_t gpa, void *data, unsigned long len) | |
1275 | { | |
1276 | gfn_t gfn = gpa >> PAGE_SHIFT; | |
1277 | int seg; | |
1278 | int offset = offset_in_page(gpa); | |
1279 | int ret; | |
1280 | ||
1281 | while ((seg = next_segment(len, offset)) != 0) { | |
1282 | ret = kvm_read_guest_page(kvm, gfn, data, offset, seg); | |
1283 | if (ret < 0) | |
1284 | return ret; | |
1285 | offset = 0; | |
1286 | len -= seg; | |
1287 | data += seg; | |
1288 | ++gfn; | |
1289 | } | |
1290 | return 0; | |
1291 | } | |
1292 | EXPORT_SYMBOL_GPL(kvm_read_guest); | |
1293 | ||
7ec54588 MT |
1294 | int kvm_read_guest_atomic(struct kvm *kvm, gpa_t gpa, void *data, |
1295 | unsigned long len) | |
1296 | { | |
1297 | int r; | |
1298 | unsigned long addr; | |
1299 | gfn_t gfn = gpa >> PAGE_SHIFT; | |
1300 | int offset = offset_in_page(gpa); | |
1301 | ||
1302 | addr = gfn_to_hva(kvm, gfn); | |
1303 | if (kvm_is_error_hva(addr)) | |
1304 | return -EFAULT; | |
0aac03f0 | 1305 | pagefault_disable(); |
7ec54588 | 1306 | r = __copy_from_user_inatomic(data, (void __user *)addr + offset, len); |
0aac03f0 | 1307 | pagefault_enable(); |
7ec54588 MT |
1308 | if (r) |
1309 | return -EFAULT; | |
1310 | return 0; | |
1311 | } | |
1312 | EXPORT_SYMBOL(kvm_read_guest_atomic); | |
1313 | ||
195aefde IE |
1314 | int kvm_write_guest_page(struct kvm *kvm, gfn_t gfn, const void *data, |
1315 | int offset, int len) | |
1316 | { | |
e0506bcb IE |
1317 | int r; |
1318 | unsigned long addr; | |
195aefde | 1319 | |
e0506bcb IE |
1320 | addr = gfn_to_hva(kvm, gfn); |
1321 | if (kvm_is_error_hva(addr)) | |
1322 | return -EFAULT; | |
1323 | r = copy_to_user((void __user *)addr + offset, data, len); | |
1324 | if (r) | |
195aefde | 1325 | return -EFAULT; |
195aefde IE |
1326 | mark_page_dirty(kvm, gfn); |
1327 | return 0; | |
1328 | } | |
1329 | EXPORT_SYMBOL_GPL(kvm_write_guest_page); | |
1330 | ||
1331 | int kvm_write_guest(struct kvm *kvm, gpa_t gpa, const void *data, | |
1332 | unsigned long len) | |
1333 | { | |
1334 | gfn_t gfn = gpa >> PAGE_SHIFT; | |
1335 | int seg; | |
1336 | int offset = offset_in_page(gpa); | |
1337 | int ret; | |
1338 | ||
1339 | while ((seg = next_segment(len, offset)) != 0) { | |
1340 | ret = kvm_write_guest_page(kvm, gfn, data, offset, seg); | |
1341 | if (ret < 0) | |
1342 | return ret; | |
1343 | offset = 0; | |
1344 | len -= seg; | |
1345 | data += seg; | |
1346 | ++gfn; | |
1347 | } | |
1348 | return 0; | |
1349 | } | |
1350 | ||
49c7754c GN |
1351 | int kvm_gfn_to_hva_cache_init(struct kvm *kvm, struct gfn_to_hva_cache *ghc, |
1352 | gpa_t gpa) | |
1353 | { | |
1354 | struct kvm_memslots *slots = kvm_memslots(kvm); | |
1355 | int offset = offset_in_page(gpa); | |
1356 | gfn_t gfn = gpa >> PAGE_SHIFT; | |
1357 | ||
1358 | ghc->gpa = gpa; | |
1359 | ghc->generation = slots->generation; | |
1360 | ghc->memslot = __gfn_to_memslot(slots, gfn); | |
1361 | ghc->hva = gfn_to_hva_many(ghc->memslot, gfn, NULL); | |
1362 | if (!kvm_is_error_hva(ghc->hva)) | |
1363 | ghc->hva += offset; | |
1364 | else | |
1365 | return -EFAULT; | |
1366 | ||
1367 | return 0; | |
1368 | } | |
1369 | EXPORT_SYMBOL_GPL(kvm_gfn_to_hva_cache_init); | |
1370 | ||
1371 | int kvm_write_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc, | |
1372 | void *data, unsigned long len) | |
1373 | { | |
1374 | struct kvm_memslots *slots = kvm_memslots(kvm); | |
1375 | int r; | |
1376 | ||
1377 | if (slots->generation != ghc->generation) | |
1378 | kvm_gfn_to_hva_cache_init(kvm, ghc, ghc->gpa); | |
1379 | ||
1380 | if (kvm_is_error_hva(ghc->hva)) | |
1381 | return -EFAULT; | |
1382 | ||
1383 | r = copy_to_user((void __user *)ghc->hva, data, len); | |
1384 | if (r) | |
1385 | return -EFAULT; | |
1386 | mark_page_dirty_in_slot(kvm, ghc->memslot, ghc->gpa >> PAGE_SHIFT); | |
1387 | ||
1388 | return 0; | |
1389 | } | |
1390 | EXPORT_SYMBOL_GPL(kvm_write_guest_cached); | |
1391 | ||
195aefde IE |
1392 | int kvm_clear_guest_page(struct kvm *kvm, gfn_t gfn, int offset, int len) |
1393 | { | |
3bcc8a8c HC |
1394 | return kvm_write_guest_page(kvm, gfn, (const void *) empty_zero_page, |
1395 | offset, len); | |
195aefde IE |
1396 | } |
1397 | EXPORT_SYMBOL_GPL(kvm_clear_guest_page); | |
1398 | ||
1399 | int kvm_clear_guest(struct kvm *kvm, gpa_t gpa, unsigned long len) | |
1400 | { | |
1401 | gfn_t gfn = gpa >> PAGE_SHIFT; | |
1402 | int seg; | |
1403 | int offset = offset_in_page(gpa); | |
1404 | int ret; | |
1405 | ||
1406 | while ((seg = next_segment(len, offset)) != 0) { | |
1407 | ret = kvm_clear_guest_page(kvm, gfn, offset, seg); | |
1408 | if (ret < 0) | |
1409 | return ret; | |
1410 | offset = 0; | |
1411 | len -= seg; | |
1412 | ++gfn; | |
1413 | } | |
1414 | return 0; | |
1415 | } | |
1416 | EXPORT_SYMBOL_GPL(kvm_clear_guest); | |
1417 | ||
49c7754c GN |
1418 | void mark_page_dirty_in_slot(struct kvm *kvm, struct kvm_memory_slot *memslot, |
1419 | gfn_t gfn) | |
6aa8b732 | 1420 | { |
7e9d619d RR |
1421 | if (memslot && memslot->dirty_bitmap) { |
1422 | unsigned long rel_gfn = gfn - memslot->base_gfn; | |
6aa8b732 | 1423 | |
d1476937 | 1424 | generic___set_le_bit(rel_gfn, memslot->dirty_bitmap); |
6aa8b732 AK |
1425 | } |
1426 | } | |
1427 | ||
49c7754c GN |
1428 | void mark_page_dirty(struct kvm *kvm, gfn_t gfn) |
1429 | { | |
1430 | struct kvm_memory_slot *memslot; | |
1431 | ||
1432 | memslot = gfn_to_memslot(kvm, gfn); | |
1433 | mark_page_dirty_in_slot(kvm, memslot, gfn); | |
1434 | } | |
1435 | ||
b6958ce4 ED |
1436 | /* |
1437 | * The vCPU has executed a HLT instruction with in-kernel mode enabled. | |
1438 | */ | |
8776e519 | 1439 | void kvm_vcpu_block(struct kvm_vcpu *vcpu) |
d3bef15f | 1440 | { |
e5c239cf MT |
1441 | DEFINE_WAIT(wait); |
1442 | ||
1443 | for (;;) { | |
1444 | prepare_to_wait(&vcpu->wq, &wait, TASK_INTERRUPTIBLE); | |
1445 | ||
a1b37100 | 1446 | if (kvm_arch_vcpu_runnable(vcpu)) { |
a8eeb04a | 1447 | kvm_make_request(KVM_REQ_UNHALT, vcpu); |
e5c239cf | 1448 | break; |
d7690175 | 1449 | } |
09cec754 GN |
1450 | if (kvm_cpu_has_pending_timer(vcpu)) |
1451 | break; | |
e5c239cf MT |
1452 | if (signal_pending(current)) |
1453 | break; | |
1454 | ||
b6958ce4 | 1455 | schedule(); |
b6958ce4 | 1456 | } |
d3bef15f | 1457 | |
e5c239cf | 1458 | finish_wait(&vcpu->wq, &wait); |
b6958ce4 ED |
1459 | } |
1460 | ||
6aa8b732 AK |
1461 | void kvm_resched(struct kvm_vcpu *vcpu) |
1462 | { | |
3fca0365 YD |
1463 | if (!need_resched()) |
1464 | return; | |
6aa8b732 | 1465 | cond_resched(); |
6aa8b732 AK |
1466 | } |
1467 | EXPORT_SYMBOL_GPL(kvm_resched); | |
1468 | ||
d255f4f2 ZE |
1469 | void kvm_vcpu_on_spin(struct kvm_vcpu *vcpu) |
1470 | { | |
1471 | ktime_t expires; | |
1472 | DEFINE_WAIT(wait); | |
1473 | ||
1474 | prepare_to_wait(&vcpu->wq, &wait, TASK_INTERRUPTIBLE); | |
1475 | ||
1476 | /* Sleep for 100 us, and hope lock-holder got scheduled */ | |
1477 | expires = ktime_add_ns(ktime_get(), 100000UL); | |
1478 | schedule_hrtimeout(&expires, HRTIMER_MODE_ABS); | |
1479 | ||
1480 | finish_wait(&vcpu->wq, &wait); | |
1481 | } | |
1482 | EXPORT_SYMBOL_GPL(kvm_vcpu_on_spin); | |
1483 | ||
e4a533a4 | 1484 | static int kvm_vcpu_fault(struct vm_area_struct *vma, struct vm_fault *vmf) |
9a2bb7f4 AK |
1485 | { |
1486 | struct kvm_vcpu *vcpu = vma->vm_file->private_data; | |
9a2bb7f4 AK |
1487 | struct page *page; |
1488 | ||
e4a533a4 | 1489 | if (vmf->pgoff == 0) |
039576c0 | 1490 | page = virt_to_page(vcpu->run); |
09566765 | 1491 | #ifdef CONFIG_X86 |
e4a533a4 | 1492 | else if (vmf->pgoff == KVM_PIO_PAGE_OFFSET) |
ad312c7c | 1493 | page = virt_to_page(vcpu->arch.pio_data); |
5f94c174 LV |
1494 | #endif |
1495 | #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET | |
1496 | else if (vmf->pgoff == KVM_COALESCED_MMIO_PAGE_OFFSET) | |
1497 | page = virt_to_page(vcpu->kvm->coalesced_mmio_ring); | |
09566765 | 1498 | #endif |
039576c0 | 1499 | else |
e4a533a4 | 1500 | return VM_FAULT_SIGBUS; |
9a2bb7f4 | 1501 | get_page(page); |
e4a533a4 | 1502 | vmf->page = page; |
1503 | return 0; | |
9a2bb7f4 AK |
1504 | } |
1505 | ||
f0f37e2f | 1506 | static const struct vm_operations_struct kvm_vcpu_vm_ops = { |
e4a533a4 | 1507 | .fault = kvm_vcpu_fault, |
9a2bb7f4 AK |
1508 | }; |
1509 | ||
1510 | static int kvm_vcpu_mmap(struct file *file, struct vm_area_struct *vma) | |
1511 | { | |
1512 | vma->vm_ops = &kvm_vcpu_vm_ops; | |
1513 | return 0; | |
1514 | } | |
1515 | ||
bccf2150 AK |
1516 | static int kvm_vcpu_release(struct inode *inode, struct file *filp) |
1517 | { | |
1518 | struct kvm_vcpu *vcpu = filp->private_data; | |
1519 | ||
66c0b394 | 1520 | kvm_put_kvm(vcpu->kvm); |
bccf2150 AK |
1521 | return 0; |
1522 | } | |
1523 | ||
3d3aab1b | 1524 | static struct file_operations kvm_vcpu_fops = { |
bccf2150 AK |
1525 | .release = kvm_vcpu_release, |
1526 | .unlocked_ioctl = kvm_vcpu_ioctl, | |
1527 | .compat_ioctl = kvm_vcpu_ioctl, | |
9a2bb7f4 | 1528 | .mmap = kvm_vcpu_mmap, |
6038f373 | 1529 | .llseek = noop_llseek, |
bccf2150 AK |
1530 | }; |
1531 | ||
1532 | /* | |
1533 | * Allocates an inode for the vcpu. | |
1534 | */ | |
1535 | static int create_vcpu_fd(struct kvm_vcpu *vcpu) | |
1536 | { | |
628ff7c1 | 1537 | return anon_inode_getfd("kvm-vcpu", &kvm_vcpu_fops, vcpu, O_RDWR); |
bccf2150 AK |
1538 | } |
1539 | ||
c5ea7660 AK |
1540 | /* |
1541 | * Creates some virtual cpus. Good luck creating more than one. | |
1542 | */ | |
73880c80 | 1543 | static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, u32 id) |
c5ea7660 AK |
1544 | { |
1545 | int r; | |
988a2cae | 1546 | struct kvm_vcpu *vcpu, *v; |
c5ea7660 | 1547 | |
73880c80 | 1548 | vcpu = kvm_arch_vcpu_create(kvm, id); |
fb3f0f51 RR |
1549 | if (IS_ERR(vcpu)) |
1550 | return PTR_ERR(vcpu); | |
c5ea7660 | 1551 | |
15ad7146 AK |
1552 | preempt_notifier_init(&vcpu->preempt_notifier, &kvm_preempt_ops); |
1553 | ||
26e5215f AK |
1554 | r = kvm_arch_vcpu_setup(vcpu); |
1555 | if (r) | |
7d8fece6 | 1556 | return r; |
26e5215f | 1557 | |
11ec2804 | 1558 | mutex_lock(&kvm->lock); |
73880c80 GN |
1559 | if (atomic_read(&kvm->online_vcpus) == KVM_MAX_VCPUS) { |
1560 | r = -EINVAL; | |
e9b11c17 | 1561 | goto vcpu_destroy; |
fb3f0f51 | 1562 | } |
73880c80 | 1563 | |
988a2cae GN |
1564 | kvm_for_each_vcpu(r, v, kvm) |
1565 | if (v->vcpu_id == id) { | |
73880c80 GN |
1566 | r = -EEXIST; |
1567 | goto vcpu_destroy; | |
1568 | } | |
1569 | ||
1570 | BUG_ON(kvm->vcpus[atomic_read(&kvm->online_vcpus)]); | |
c5ea7660 | 1571 | |
fb3f0f51 | 1572 | /* Now it's all set up, let userspace reach it */ |
66c0b394 | 1573 | kvm_get_kvm(kvm); |
bccf2150 | 1574 | r = create_vcpu_fd(vcpu); |
73880c80 GN |
1575 | if (r < 0) { |
1576 | kvm_put_kvm(kvm); | |
1577 | goto vcpu_destroy; | |
1578 | } | |
1579 | ||
1580 | kvm->vcpus[atomic_read(&kvm->online_vcpus)] = vcpu; | |
1581 | smp_wmb(); | |
1582 | atomic_inc(&kvm->online_vcpus); | |
1583 | ||
1584 | #ifdef CONFIG_KVM_APIC_ARCHITECTURE | |
1585 | if (kvm->bsp_vcpu_id == id) | |
1586 | kvm->bsp_vcpu = vcpu; | |
1587 | #endif | |
1588 | mutex_unlock(&kvm->lock); | |
fb3f0f51 | 1589 | return r; |
39c3b86e | 1590 | |
e9b11c17 | 1591 | vcpu_destroy: |
7d8fece6 | 1592 | mutex_unlock(&kvm->lock); |
d40ccc62 | 1593 | kvm_arch_vcpu_destroy(vcpu); |
c5ea7660 AK |
1594 | return r; |
1595 | } | |
1596 | ||
1961d276 AK |
1597 | static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu *vcpu, sigset_t *sigset) |
1598 | { | |
1599 | if (sigset) { | |
1600 | sigdelsetmask(sigset, sigmask(SIGKILL)|sigmask(SIGSTOP)); | |
1601 | vcpu->sigset_active = 1; | |
1602 | vcpu->sigset = *sigset; | |
1603 | } else | |
1604 | vcpu->sigset_active = 0; | |
1605 | return 0; | |
1606 | } | |
1607 | ||
bccf2150 AK |
1608 | static long kvm_vcpu_ioctl(struct file *filp, |
1609 | unsigned int ioctl, unsigned long arg) | |
6aa8b732 | 1610 | { |
bccf2150 | 1611 | struct kvm_vcpu *vcpu = filp->private_data; |
2f366987 | 1612 | void __user *argp = (void __user *)arg; |
313a3dc7 | 1613 | int r; |
fa3795a7 DH |
1614 | struct kvm_fpu *fpu = NULL; |
1615 | struct kvm_sregs *kvm_sregs = NULL; | |
6aa8b732 | 1616 | |
6d4e4c4f AK |
1617 | if (vcpu->kvm->mm != current->mm) |
1618 | return -EIO; | |
2122ff5e AK |
1619 | |
1620 | #if defined(CONFIG_S390) || defined(CONFIG_PPC) | |
1621 | /* | |
1622 | * Special cases: vcpu ioctls that are asynchronous to vcpu execution, | |
1623 | * so vcpu_load() would break it. | |
1624 | */ | |
1625 | if (ioctl == KVM_S390_INTERRUPT || ioctl == KVM_INTERRUPT) | |
1626 | return kvm_arch_vcpu_ioctl(filp, ioctl, arg); | |
1627 | #endif | |
1628 | ||
1629 | ||
1630 | vcpu_load(vcpu); | |
6aa8b732 | 1631 | switch (ioctl) { |
9a2bb7f4 | 1632 | case KVM_RUN: |
f0fe5108 AK |
1633 | r = -EINVAL; |
1634 | if (arg) | |
1635 | goto out; | |
b6c7a5dc | 1636 | r = kvm_arch_vcpu_ioctl_run(vcpu, vcpu->run); |
64be5007 | 1637 | trace_kvm_userspace_exit(vcpu->run->exit_reason, r); |
6aa8b732 | 1638 | break; |
6aa8b732 | 1639 | case KVM_GET_REGS: { |
3e4bb3ac | 1640 | struct kvm_regs *kvm_regs; |
6aa8b732 | 1641 | |
3e4bb3ac XZ |
1642 | r = -ENOMEM; |
1643 | kvm_regs = kzalloc(sizeof(struct kvm_regs), GFP_KERNEL); | |
1644 | if (!kvm_regs) | |
6aa8b732 | 1645 | goto out; |
3e4bb3ac XZ |
1646 | r = kvm_arch_vcpu_ioctl_get_regs(vcpu, kvm_regs); |
1647 | if (r) | |
1648 | goto out_free1; | |
6aa8b732 | 1649 | r = -EFAULT; |
3e4bb3ac XZ |
1650 | if (copy_to_user(argp, kvm_regs, sizeof(struct kvm_regs))) |
1651 | goto out_free1; | |
6aa8b732 | 1652 | r = 0; |
3e4bb3ac XZ |
1653 | out_free1: |
1654 | kfree(kvm_regs); | |
6aa8b732 AK |
1655 | break; |
1656 | } | |
1657 | case KVM_SET_REGS: { | |
3e4bb3ac | 1658 | struct kvm_regs *kvm_regs; |
6aa8b732 | 1659 | |
3e4bb3ac XZ |
1660 | r = -ENOMEM; |
1661 | kvm_regs = kzalloc(sizeof(struct kvm_regs), GFP_KERNEL); | |
1662 | if (!kvm_regs) | |
6aa8b732 | 1663 | goto out; |
3e4bb3ac XZ |
1664 | r = -EFAULT; |
1665 | if (copy_from_user(kvm_regs, argp, sizeof(struct kvm_regs))) | |
1666 | goto out_free2; | |
1667 | r = kvm_arch_vcpu_ioctl_set_regs(vcpu, kvm_regs); | |
6aa8b732 | 1668 | if (r) |
3e4bb3ac | 1669 | goto out_free2; |
6aa8b732 | 1670 | r = 0; |
3e4bb3ac XZ |
1671 | out_free2: |
1672 | kfree(kvm_regs); | |
6aa8b732 AK |
1673 | break; |
1674 | } | |
1675 | case KVM_GET_SREGS: { | |
fa3795a7 DH |
1676 | kvm_sregs = kzalloc(sizeof(struct kvm_sregs), GFP_KERNEL); |
1677 | r = -ENOMEM; | |
1678 | if (!kvm_sregs) | |
1679 | goto out; | |
1680 | r = kvm_arch_vcpu_ioctl_get_sregs(vcpu, kvm_sregs); | |
6aa8b732 AK |
1681 | if (r) |
1682 | goto out; | |
1683 | r = -EFAULT; | |
fa3795a7 | 1684 | if (copy_to_user(argp, kvm_sregs, sizeof(struct kvm_sregs))) |
6aa8b732 AK |
1685 | goto out; |
1686 | r = 0; | |
1687 | break; | |
1688 | } | |
1689 | case KVM_SET_SREGS: { | |
fa3795a7 DH |
1690 | kvm_sregs = kmalloc(sizeof(struct kvm_sregs), GFP_KERNEL); |
1691 | r = -ENOMEM; | |
1692 | if (!kvm_sregs) | |
1693 | goto out; | |
6aa8b732 | 1694 | r = -EFAULT; |
fa3795a7 | 1695 | if (copy_from_user(kvm_sregs, argp, sizeof(struct kvm_sregs))) |
6aa8b732 | 1696 | goto out; |
fa3795a7 | 1697 | r = kvm_arch_vcpu_ioctl_set_sregs(vcpu, kvm_sregs); |
6aa8b732 AK |
1698 | if (r) |
1699 | goto out; | |
1700 | r = 0; | |
1701 | break; | |
1702 | } | |
62d9f0db MT |
1703 | case KVM_GET_MP_STATE: { |
1704 | struct kvm_mp_state mp_state; | |
1705 | ||
1706 | r = kvm_arch_vcpu_ioctl_get_mpstate(vcpu, &mp_state); | |
1707 | if (r) | |
1708 | goto out; | |
1709 | r = -EFAULT; | |
1710 | if (copy_to_user(argp, &mp_state, sizeof mp_state)) | |
1711 | goto out; | |
1712 | r = 0; | |
1713 | break; | |
1714 | } | |
1715 | case KVM_SET_MP_STATE: { | |
1716 | struct kvm_mp_state mp_state; | |
1717 | ||
1718 | r = -EFAULT; | |
1719 | if (copy_from_user(&mp_state, argp, sizeof mp_state)) | |
1720 | goto out; | |
1721 | r = kvm_arch_vcpu_ioctl_set_mpstate(vcpu, &mp_state); | |
1722 | if (r) | |
1723 | goto out; | |
1724 | r = 0; | |
1725 | break; | |
1726 | } | |
6aa8b732 AK |
1727 | case KVM_TRANSLATE: { |
1728 | struct kvm_translation tr; | |
1729 | ||
1730 | r = -EFAULT; | |
2f366987 | 1731 | if (copy_from_user(&tr, argp, sizeof tr)) |
6aa8b732 | 1732 | goto out; |
8b006791 | 1733 | r = kvm_arch_vcpu_ioctl_translate(vcpu, &tr); |
6aa8b732 AK |
1734 | if (r) |
1735 | goto out; | |
1736 | r = -EFAULT; | |
2f366987 | 1737 | if (copy_to_user(argp, &tr, sizeof tr)) |
6aa8b732 AK |
1738 | goto out; |
1739 | r = 0; | |
1740 | break; | |
1741 | } | |
d0bfb940 JK |
1742 | case KVM_SET_GUEST_DEBUG: { |
1743 | struct kvm_guest_debug dbg; | |
6aa8b732 AK |
1744 | |
1745 | r = -EFAULT; | |
2f366987 | 1746 | if (copy_from_user(&dbg, argp, sizeof dbg)) |
6aa8b732 | 1747 | goto out; |
d0bfb940 | 1748 | r = kvm_arch_vcpu_ioctl_set_guest_debug(vcpu, &dbg); |
6aa8b732 AK |
1749 | if (r) |
1750 | goto out; | |
1751 | r = 0; | |
1752 | break; | |
1753 | } | |
1961d276 AK |
1754 | case KVM_SET_SIGNAL_MASK: { |
1755 | struct kvm_signal_mask __user *sigmask_arg = argp; | |
1756 | struct kvm_signal_mask kvm_sigmask; | |
1757 | sigset_t sigset, *p; | |
1758 | ||
1759 | p = NULL; | |
1760 | if (argp) { | |
1761 | r = -EFAULT; | |
1762 | if (copy_from_user(&kvm_sigmask, argp, | |
1763 | sizeof kvm_sigmask)) | |
1764 | goto out; | |
1765 | r = -EINVAL; | |
1766 | if (kvm_sigmask.len != sizeof sigset) | |
1767 | goto out; | |
1768 | r = -EFAULT; | |
1769 | if (copy_from_user(&sigset, sigmask_arg->sigset, | |
1770 | sizeof sigset)) | |
1771 | goto out; | |
1772 | p = &sigset; | |
1773 | } | |
376d41ff | 1774 | r = kvm_vcpu_ioctl_set_sigmask(vcpu, p); |
1961d276 AK |
1775 | break; |
1776 | } | |
b8836737 | 1777 | case KVM_GET_FPU: { |
fa3795a7 DH |
1778 | fpu = kzalloc(sizeof(struct kvm_fpu), GFP_KERNEL); |
1779 | r = -ENOMEM; | |
1780 | if (!fpu) | |
1781 | goto out; | |
1782 | r = kvm_arch_vcpu_ioctl_get_fpu(vcpu, fpu); | |
b8836737 AK |
1783 | if (r) |
1784 | goto out; | |
1785 | r = -EFAULT; | |
fa3795a7 | 1786 | if (copy_to_user(argp, fpu, sizeof(struct kvm_fpu))) |
b8836737 AK |
1787 | goto out; |
1788 | r = 0; | |
1789 | break; | |
1790 | } | |
1791 | case KVM_SET_FPU: { | |
fa3795a7 DH |
1792 | fpu = kmalloc(sizeof(struct kvm_fpu), GFP_KERNEL); |
1793 | r = -ENOMEM; | |
1794 | if (!fpu) | |
1795 | goto out; | |
b8836737 | 1796 | r = -EFAULT; |
fa3795a7 | 1797 | if (copy_from_user(fpu, argp, sizeof(struct kvm_fpu))) |
b8836737 | 1798 | goto out; |
fa3795a7 | 1799 | r = kvm_arch_vcpu_ioctl_set_fpu(vcpu, fpu); |
b8836737 AK |
1800 | if (r) |
1801 | goto out; | |
1802 | r = 0; | |
1803 | break; | |
1804 | } | |
bccf2150 | 1805 | default: |
313a3dc7 | 1806 | r = kvm_arch_vcpu_ioctl(filp, ioctl, arg); |
bccf2150 AK |
1807 | } |
1808 | out: | |
2122ff5e | 1809 | vcpu_put(vcpu); |
fa3795a7 DH |
1810 | kfree(fpu); |
1811 | kfree(kvm_sregs); | |
bccf2150 AK |
1812 | return r; |
1813 | } | |
1814 | ||
1815 | static long kvm_vm_ioctl(struct file *filp, | |
1816 | unsigned int ioctl, unsigned long arg) | |
1817 | { | |
1818 | struct kvm *kvm = filp->private_data; | |
1819 | void __user *argp = (void __user *)arg; | |
1fe779f8 | 1820 | int r; |
bccf2150 | 1821 | |
6d4e4c4f AK |
1822 | if (kvm->mm != current->mm) |
1823 | return -EIO; | |
bccf2150 AK |
1824 | switch (ioctl) { |
1825 | case KVM_CREATE_VCPU: | |
1826 | r = kvm_vm_ioctl_create_vcpu(kvm, arg); | |
1827 | if (r < 0) | |
1828 | goto out; | |
1829 | break; | |
6fc138d2 IE |
1830 | case KVM_SET_USER_MEMORY_REGION: { |
1831 | struct kvm_userspace_memory_region kvm_userspace_mem; | |
1832 | ||
1833 | r = -EFAULT; | |
1834 | if (copy_from_user(&kvm_userspace_mem, argp, | |
1835 | sizeof kvm_userspace_mem)) | |
1836 | goto out; | |
1837 | ||
1838 | r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_userspace_mem, 1); | |
6aa8b732 AK |
1839 | if (r) |
1840 | goto out; | |
1841 | break; | |
1842 | } | |
1843 | case KVM_GET_DIRTY_LOG: { | |
1844 | struct kvm_dirty_log log; | |
1845 | ||
1846 | r = -EFAULT; | |
2f366987 | 1847 | if (copy_from_user(&log, argp, sizeof log)) |
6aa8b732 | 1848 | goto out; |
2c6f5df9 | 1849 | r = kvm_vm_ioctl_get_dirty_log(kvm, &log); |
6aa8b732 AK |
1850 | if (r) |
1851 | goto out; | |
1852 | break; | |
1853 | } | |
5f94c174 LV |
1854 | #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET |
1855 | case KVM_REGISTER_COALESCED_MMIO: { | |
1856 | struct kvm_coalesced_mmio_zone zone; | |
1857 | r = -EFAULT; | |
1858 | if (copy_from_user(&zone, argp, sizeof zone)) | |
1859 | goto out; | |
5f94c174 LV |
1860 | r = kvm_vm_ioctl_register_coalesced_mmio(kvm, &zone); |
1861 | if (r) | |
1862 | goto out; | |
1863 | r = 0; | |
1864 | break; | |
1865 | } | |
1866 | case KVM_UNREGISTER_COALESCED_MMIO: { | |
1867 | struct kvm_coalesced_mmio_zone zone; | |
1868 | r = -EFAULT; | |
1869 | if (copy_from_user(&zone, argp, sizeof zone)) | |
1870 | goto out; | |
5f94c174 LV |
1871 | r = kvm_vm_ioctl_unregister_coalesced_mmio(kvm, &zone); |
1872 | if (r) | |
1873 | goto out; | |
1874 | r = 0; | |
1875 | break; | |
1876 | } | |
1877 | #endif | |
721eecbf GH |
1878 | case KVM_IRQFD: { |
1879 | struct kvm_irqfd data; | |
1880 | ||
1881 | r = -EFAULT; | |
1882 | if (copy_from_user(&data, argp, sizeof data)) | |
1883 | goto out; | |
1884 | r = kvm_irqfd(kvm, data.fd, data.gsi, data.flags); | |
1885 | break; | |
1886 | } | |
d34e6b17 GH |
1887 | case KVM_IOEVENTFD: { |
1888 | struct kvm_ioeventfd data; | |
1889 | ||
1890 | r = -EFAULT; | |
1891 | if (copy_from_user(&data, argp, sizeof data)) | |
1892 | goto out; | |
1893 | r = kvm_ioeventfd(kvm, &data); | |
1894 | break; | |
1895 | } | |
73880c80 GN |
1896 | #ifdef CONFIG_KVM_APIC_ARCHITECTURE |
1897 | case KVM_SET_BOOT_CPU_ID: | |
1898 | r = 0; | |
894a9c55 | 1899 | mutex_lock(&kvm->lock); |
73880c80 GN |
1900 | if (atomic_read(&kvm->online_vcpus) != 0) |
1901 | r = -EBUSY; | |
1902 | else | |
1903 | kvm->bsp_vcpu_id = arg; | |
894a9c55 | 1904 | mutex_unlock(&kvm->lock); |
73880c80 GN |
1905 | break; |
1906 | #endif | |
f17abe9a | 1907 | default: |
1fe779f8 | 1908 | r = kvm_arch_vm_ioctl(filp, ioctl, arg); |
bfd99ff5 AK |
1909 | if (r == -ENOTTY) |
1910 | r = kvm_vm_ioctl_assigned_device(kvm, ioctl, arg); | |
f17abe9a AK |
1911 | } |
1912 | out: | |
1913 | return r; | |
1914 | } | |
1915 | ||
6ff5894c AB |
1916 | #ifdef CONFIG_COMPAT |
1917 | struct compat_kvm_dirty_log { | |
1918 | __u32 slot; | |
1919 | __u32 padding1; | |
1920 | union { | |
1921 | compat_uptr_t dirty_bitmap; /* one bit per page */ | |
1922 | __u64 padding2; | |
1923 | }; | |
1924 | }; | |
1925 | ||
1926 | static long kvm_vm_compat_ioctl(struct file *filp, | |
1927 | unsigned int ioctl, unsigned long arg) | |
1928 | { | |
1929 | struct kvm *kvm = filp->private_data; | |
1930 | int r; | |
1931 | ||
1932 | if (kvm->mm != current->mm) | |
1933 | return -EIO; | |
1934 | switch (ioctl) { | |
1935 | case KVM_GET_DIRTY_LOG: { | |
1936 | struct compat_kvm_dirty_log compat_log; | |
1937 | struct kvm_dirty_log log; | |
1938 | ||
1939 | r = -EFAULT; | |
1940 | if (copy_from_user(&compat_log, (void __user *)arg, | |
1941 | sizeof(compat_log))) | |
1942 | goto out; | |
1943 | log.slot = compat_log.slot; | |
1944 | log.padding1 = compat_log.padding1; | |
1945 | log.padding2 = compat_log.padding2; | |
1946 | log.dirty_bitmap = compat_ptr(compat_log.dirty_bitmap); | |
1947 | ||
1948 | r = kvm_vm_ioctl_get_dirty_log(kvm, &log); | |
1949 | if (r) | |
1950 | goto out; | |
1951 | break; | |
1952 | } | |
1953 | default: | |
1954 | r = kvm_vm_ioctl(filp, ioctl, arg); | |
1955 | } | |
1956 | ||
1957 | out: | |
1958 | return r; | |
1959 | } | |
1960 | #endif | |
1961 | ||
e4a533a4 | 1962 | static int kvm_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf) |
f17abe9a | 1963 | { |
777b3f49 MT |
1964 | struct page *page[1]; |
1965 | unsigned long addr; | |
1966 | int npages; | |
1967 | gfn_t gfn = vmf->pgoff; | |
f17abe9a | 1968 | struct kvm *kvm = vma->vm_file->private_data; |
f17abe9a | 1969 | |
777b3f49 MT |
1970 | addr = gfn_to_hva(kvm, gfn); |
1971 | if (kvm_is_error_hva(addr)) | |
e4a533a4 | 1972 | return VM_FAULT_SIGBUS; |
777b3f49 MT |
1973 | |
1974 | npages = get_user_pages(current, current->mm, addr, 1, 1, 0, page, | |
1975 | NULL); | |
1976 | if (unlikely(npages != 1)) | |
e4a533a4 | 1977 | return VM_FAULT_SIGBUS; |
777b3f49 MT |
1978 | |
1979 | vmf->page = page[0]; | |
e4a533a4 | 1980 | return 0; |
f17abe9a AK |
1981 | } |
1982 | ||
f0f37e2f | 1983 | static const struct vm_operations_struct kvm_vm_vm_ops = { |
e4a533a4 | 1984 | .fault = kvm_vm_fault, |
f17abe9a AK |
1985 | }; |
1986 | ||
1987 | static int kvm_vm_mmap(struct file *file, struct vm_area_struct *vma) | |
1988 | { | |
1989 | vma->vm_ops = &kvm_vm_vm_ops; | |
1990 | return 0; | |
1991 | } | |
1992 | ||
3d3aab1b | 1993 | static struct file_operations kvm_vm_fops = { |
f17abe9a AK |
1994 | .release = kvm_vm_release, |
1995 | .unlocked_ioctl = kvm_vm_ioctl, | |
6ff5894c AB |
1996 | #ifdef CONFIG_COMPAT |
1997 | .compat_ioctl = kvm_vm_compat_ioctl, | |
1998 | #endif | |
f17abe9a | 1999 | .mmap = kvm_vm_mmap, |
6038f373 | 2000 | .llseek = noop_llseek, |
f17abe9a AK |
2001 | }; |
2002 | ||
2003 | static int kvm_dev_ioctl_create_vm(void) | |
2004 | { | |
aac87636 | 2005 | int r; |
f17abe9a AK |
2006 | struct kvm *kvm; |
2007 | ||
f17abe9a | 2008 | kvm = kvm_create_vm(); |
d6d28168 AK |
2009 | if (IS_ERR(kvm)) |
2010 | return PTR_ERR(kvm); | |
6ce5a090 TY |
2011 | #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET |
2012 | r = kvm_coalesced_mmio_init(kvm); | |
2013 | if (r < 0) { | |
2014 | kvm_put_kvm(kvm); | |
2015 | return r; | |
2016 | } | |
2017 | #endif | |
aac87636 HC |
2018 | r = anon_inode_getfd("kvm-vm", &kvm_vm_fops, kvm, O_RDWR); |
2019 | if (r < 0) | |
66c0b394 | 2020 | kvm_put_kvm(kvm); |
f17abe9a | 2021 | |
aac87636 | 2022 | return r; |
f17abe9a AK |
2023 | } |
2024 | ||
1a811b61 AK |
2025 | static long kvm_dev_ioctl_check_extension_generic(long arg) |
2026 | { | |
2027 | switch (arg) { | |
ca9edaee | 2028 | case KVM_CAP_USER_MEMORY: |
1a811b61 | 2029 | case KVM_CAP_DESTROY_MEMORY_REGION_WORKS: |
4cd481f6 | 2030 | case KVM_CAP_JOIN_MEMORY_REGIONS_WORKS: |
73880c80 GN |
2031 | #ifdef CONFIG_KVM_APIC_ARCHITECTURE |
2032 | case KVM_CAP_SET_BOOT_CPU_ID: | |
2033 | #endif | |
a9c7399d | 2034 | case KVM_CAP_INTERNAL_ERROR_DATA: |
1a811b61 | 2035 | return 1; |
399ec807 AK |
2036 | #ifdef CONFIG_HAVE_KVM_IRQCHIP |
2037 | case KVM_CAP_IRQ_ROUTING: | |
36463146 | 2038 | return KVM_MAX_IRQ_ROUTES; |
399ec807 | 2039 | #endif |
1a811b61 AK |
2040 | default: |
2041 | break; | |
2042 | } | |
2043 | return kvm_dev_ioctl_check_extension(arg); | |
2044 | } | |
2045 | ||
f17abe9a AK |
2046 | static long kvm_dev_ioctl(struct file *filp, |
2047 | unsigned int ioctl, unsigned long arg) | |
2048 | { | |
07c45a36 | 2049 | long r = -EINVAL; |
f17abe9a AK |
2050 | |
2051 | switch (ioctl) { | |
2052 | case KVM_GET_API_VERSION: | |
f0fe5108 AK |
2053 | r = -EINVAL; |
2054 | if (arg) | |
2055 | goto out; | |
f17abe9a AK |
2056 | r = KVM_API_VERSION; |
2057 | break; | |
2058 | case KVM_CREATE_VM: | |
f0fe5108 AK |
2059 | r = -EINVAL; |
2060 | if (arg) | |
2061 | goto out; | |
f17abe9a AK |
2062 | r = kvm_dev_ioctl_create_vm(); |
2063 | break; | |
018d00d2 | 2064 | case KVM_CHECK_EXTENSION: |
1a811b61 | 2065 | r = kvm_dev_ioctl_check_extension_generic(arg); |
5d308f45 | 2066 | break; |
07c45a36 AK |
2067 | case KVM_GET_VCPU_MMAP_SIZE: |
2068 | r = -EINVAL; | |
2069 | if (arg) | |
2070 | goto out; | |
adb1ff46 AK |
2071 | r = PAGE_SIZE; /* struct kvm_run */ |
2072 | #ifdef CONFIG_X86 | |
2073 | r += PAGE_SIZE; /* pio data page */ | |
5f94c174 LV |
2074 | #endif |
2075 | #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET | |
2076 | r += PAGE_SIZE; /* coalesced mmio ring page */ | |
adb1ff46 | 2077 | #endif |
07c45a36 | 2078 | break; |
d4c9ff2d FEL |
2079 | case KVM_TRACE_ENABLE: |
2080 | case KVM_TRACE_PAUSE: | |
2081 | case KVM_TRACE_DISABLE: | |
2023a29c | 2082 | r = -EOPNOTSUPP; |
d4c9ff2d | 2083 | break; |
6aa8b732 | 2084 | default: |
043405e1 | 2085 | return kvm_arch_dev_ioctl(filp, ioctl, arg); |
6aa8b732 AK |
2086 | } |
2087 | out: | |
2088 | return r; | |
2089 | } | |
2090 | ||
6aa8b732 | 2091 | static struct file_operations kvm_chardev_ops = { |
6aa8b732 AK |
2092 | .unlocked_ioctl = kvm_dev_ioctl, |
2093 | .compat_ioctl = kvm_dev_ioctl, | |
6038f373 | 2094 | .llseek = noop_llseek, |
6aa8b732 AK |
2095 | }; |
2096 | ||
2097 | static struct miscdevice kvm_dev = { | |
bbe4432e | 2098 | KVM_MINOR, |
6aa8b732 AK |
2099 | "kvm", |
2100 | &kvm_chardev_ops, | |
2101 | }; | |
2102 | ||
75b7127c | 2103 | static void hardware_enable_nolock(void *junk) |
1b6c0168 AK |
2104 | { |
2105 | int cpu = raw_smp_processor_id(); | |
10474ae8 | 2106 | int r; |
1b6c0168 | 2107 | |
7f59f492 | 2108 | if (cpumask_test_cpu(cpu, cpus_hardware_enabled)) |
1b6c0168 | 2109 | return; |
10474ae8 | 2110 | |
7f59f492 | 2111 | cpumask_set_cpu(cpu, cpus_hardware_enabled); |
10474ae8 AG |
2112 | |
2113 | r = kvm_arch_hardware_enable(NULL); | |
2114 | ||
2115 | if (r) { | |
2116 | cpumask_clear_cpu(cpu, cpus_hardware_enabled); | |
2117 | atomic_inc(&hardware_enable_failed); | |
2118 | printk(KERN_INFO "kvm: enabling virtualization on " | |
2119 | "CPU%d failed\n", cpu); | |
2120 | } | |
1b6c0168 AK |
2121 | } |
2122 | ||
75b7127c TY |
2123 | static void hardware_enable(void *junk) |
2124 | { | |
2125 | spin_lock(&kvm_lock); | |
2126 | hardware_enable_nolock(junk); | |
2127 | spin_unlock(&kvm_lock); | |
2128 | } | |
2129 | ||
2130 | static void hardware_disable_nolock(void *junk) | |
1b6c0168 AK |
2131 | { |
2132 | int cpu = raw_smp_processor_id(); | |
2133 | ||
7f59f492 | 2134 | if (!cpumask_test_cpu(cpu, cpus_hardware_enabled)) |
1b6c0168 | 2135 | return; |
7f59f492 | 2136 | cpumask_clear_cpu(cpu, cpus_hardware_enabled); |
e9b11c17 | 2137 | kvm_arch_hardware_disable(NULL); |
1b6c0168 AK |
2138 | } |
2139 | ||
75b7127c TY |
2140 | static void hardware_disable(void *junk) |
2141 | { | |
2142 | spin_lock(&kvm_lock); | |
2143 | hardware_disable_nolock(junk); | |
2144 | spin_unlock(&kvm_lock); | |
2145 | } | |
2146 | ||
10474ae8 AG |
2147 | static void hardware_disable_all_nolock(void) |
2148 | { | |
2149 | BUG_ON(!kvm_usage_count); | |
2150 | ||
2151 | kvm_usage_count--; | |
2152 | if (!kvm_usage_count) | |
75b7127c | 2153 | on_each_cpu(hardware_disable_nolock, NULL, 1); |
10474ae8 AG |
2154 | } |
2155 | ||
2156 | static void hardware_disable_all(void) | |
2157 | { | |
2158 | spin_lock(&kvm_lock); | |
2159 | hardware_disable_all_nolock(); | |
2160 | spin_unlock(&kvm_lock); | |
2161 | } | |
2162 | ||
2163 | static int hardware_enable_all(void) | |
2164 | { | |
2165 | int r = 0; | |
2166 | ||
2167 | spin_lock(&kvm_lock); | |
2168 | ||
2169 | kvm_usage_count++; | |
2170 | if (kvm_usage_count == 1) { | |
2171 | atomic_set(&hardware_enable_failed, 0); | |
75b7127c | 2172 | on_each_cpu(hardware_enable_nolock, NULL, 1); |
10474ae8 AG |
2173 | |
2174 | if (atomic_read(&hardware_enable_failed)) { | |
2175 | hardware_disable_all_nolock(); | |
2176 | r = -EBUSY; | |
2177 | } | |
2178 | } | |
2179 | ||
2180 | spin_unlock(&kvm_lock); | |
2181 | ||
2182 | return r; | |
2183 | } | |
2184 | ||
774c47f1 AK |
2185 | static int kvm_cpu_hotplug(struct notifier_block *notifier, unsigned long val, |
2186 | void *v) | |
2187 | { | |
2188 | int cpu = (long)v; | |
2189 | ||
10474ae8 AG |
2190 | if (!kvm_usage_count) |
2191 | return NOTIFY_OK; | |
2192 | ||
1a6f4d7f | 2193 | val &= ~CPU_TASKS_FROZEN; |
774c47f1 | 2194 | switch (val) { |
cec9ad27 | 2195 | case CPU_DYING: |
6ec8a856 AK |
2196 | printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n", |
2197 | cpu); | |
2198 | hardware_disable(NULL); | |
2199 | break; | |
da908f2f | 2200 | case CPU_STARTING: |
43934a38 JK |
2201 | printk(KERN_INFO "kvm: enabling virtualization on CPU%d\n", |
2202 | cpu); | |
da908f2f | 2203 | hardware_enable(NULL); |
774c47f1 AK |
2204 | break; |
2205 | } | |
2206 | return NOTIFY_OK; | |
2207 | } | |
2208 | ||
4ecac3fd | 2209 | |
b7c4145b | 2210 | asmlinkage void kvm_spurious_fault(void) |
4ecac3fd | 2211 | { |
4ecac3fd AK |
2212 | /* Fault while not rebooting. We want the trace. */ |
2213 | BUG(); | |
2214 | } | |
b7c4145b | 2215 | EXPORT_SYMBOL_GPL(kvm_spurious_fault); |
4ecac3fd | 2216 | |
9a2b85c6 | 2217 | static int kvm_reboot(struct notifier_block *notifier, unsigned long val, |
d77c26fc | 2218 | void *v) |
9a2b85c6 | 2219 | { |
8e1c1815 SY |
2220 | /* |
2221 | * Some (well, at least mine) BIOSes hang on reboot if | |
2222 | * in vmx root mode. | |
2223 | * | |
2224 | * And Intel TXT required VMX off for all cpu when system shutdown. | |
2225 | */ | |
2226 | printk(KERN_INFO "kvm: exiting hardware virtualization\n"); | |
2227 | kvm_rebooting = true; | |
75b7127c | 2228 | on_each_cpu(hardware_disable_nolock, NULL, 1); |
9a2b85c6 RR |
2229 | return NOTIFY_OK; |
2230 | } | |
2231 | ||
2232 | static struct notifier_block kvm_reboot_notifier = { | |
2233 | .notifier_call = kvm_reboot, | |
2234 | .priority = 0, | |
2235 | }; | |
2236 | ||
e93f8a0f | 2237 | static void kvm_io_bus_destroy(struct kvm_io_bus *bus) |
2eeb2e94 GH |
2238 | { |
2239 | int i; | |
2240 | ||
2241 | for (i = 0; i < bus->dev_count; i++) { | |
2242 | struct kvm_io_device *pos = bus->devs[i]; | |
2243 | ||
2244 | kvm_iodevice_destructor(pos); | |
2245 | } | |
e93f8a0f | 2246 | kfree(bus); |
2eeb2e94 GH |
2247 | } |
2248 | ||
bda9020e | 2249 | /* kvm_io_bus_write - called under kvm->slots_lock */ |
e93f8a0f | 2250 | int kvm_io_bus_write(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr, |
bda9020e | 2251 | int len, const void *val) |
2eeb2e94 GH |
2252 | { |
2253 | int i; | |
90d83dc3 LJ |
2254 | struct kvm_io_bus *bus; |
2255 | ||
2256 | bus = srcu_dereference(kvm->buses[bus_idx], &kvm->srcu); | |
bda9020e MT |
2257 | for (i = 0; i < bus->dev_count; i++) |
2258 | if (!kvm_iodevice_write(bus->devs[i], addr, len, val)) | |
2259 | return 0; | |
2260 | return -EOPNOTSUPP; | |
2261 | } | |
2eeb2e94 | 2262 | |
bda9020e | 2263 | /* kvm_io_bus_read - called under kvm->slots_lock */ |
e93f8a0f MT |
2264 | int kvm_io_bus_read(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr, |
2265 | int len, void *val) | |
bda9020e MT |
2266 | { |
2267 | int i; | |
90d83dc3 | 2268 | struct kvm_io_bus *bus; |
e93f8a0f | 2269 | |
90d83dc3 | 2270 | bus = srcu_dereference(kvm->buses[bus_idx], &kvm->srcu); |
bda9020e MT |
2271 | for (i = 0; i < bus->dev_count; i++) |
2272 | if (!kvm_iodevice_read(bus->devs[i], addr, len, val)) | |
2273 | return 0; | |
2274 | return -EOPNOTSUPP; | |
2eeb2e94 GH |
2275 | } |
2276 | ||
79fac95e | 2277 | /* Caller must hold slots_lock. */ |
e93f8a0f MT |
2278 | int kvm_io_bus_register_dev(struct kvm *kvm, enum kvm_bus bus_idx, |
2279 | struct kvm_io_device *dev) | |
6c474694 | 2280 | { |
e93f8a0f | 2281 | struct kvm_io_bus *new_bus, *bus; |
090b7aff | 2282 | |
e93f8a0f | 2283 | bus = kvm->buses[bus_idx]; |
090b7aff GH |
2284 | if (bus->dev_count > NR_IOBUS_DEVS-1) |
2285 | return -ENOSPC; | |
2eeb2e94 | 2286 | |
e93f8a0f MT |
2287 | new_bus = kzalloc(sizeof(struct kvm_io_bus), GFP_KERNEL); |
2288 | if (!new_bus) | |
2289 | return -ENOMEM; | |
2290 | memcpy(new_bus, bus, sizeof(struct kvm_io_bus)); | |
2291 | new_bus->devs[new_bus->dev_count++] = dev; | |
2292 | rcu_assign_pointer(kvm->buses[bus_idx], new_bus); | |
2293 | synchronize_srcu_expedited(&kvm->srcu); | |
2294 | kfree(bus); | |
090b7aff GH |
2295 | |
2296 | return 0; | |
2297 | } | |
2298 | ||
79fac95e | 2299 | /* Caller must hold slots_lock. */ |
e93f8a0f MT |
2300 | int kvm_io_bus_unregister_dev(struct kvm *kvm, enum kvm_bus bus_idx, |
2301 | struct kvm_io_device *dev) | |
090b7aff | 2302 | { |
e93f8a0f MT |
2303 | int i, r; |
2304 | struct kvm_io_bus *new_bus, *bus; | |
090b7aff | 2305 | |
e93f8a0f MT |
2306 | new_bus = kzalloc(sizeof(struct kvm_io_bus), GFP_KERNEL); |
2307 | if (!new_bus) | |
2308 | return -ENOMEM; | |
090b7aff | 2309 | |
e93f8a0f MT |
2310 | bus = kvm->buses[bus_idx]; |
2311 | memcpy(new_bus, bus, sizeof(struct kvm_io_bus)); | |
2312 | ||
2313 | r = -ENOENT; | |
2314 | for (i = 0; i < new_bus->dev_count; i++) | |
2315 | if (new_bus->devs[i] == dev) { | |
2316 | r = 0; | |
2317 | new_bus->devs[i] = new_bus->devs[--new_bus->dev_count]; | |
090b7aff GH |
2318 | break; |
2319 | } | |
e93f8a0f MT |
2320 | |
2321 | if (r) { | |
2322 | kfree(new_bus); | |
2323 | return r; | |
2324 | } | |
2325 | ||
2326 | rcu_assign_pointer(kvm->buses[bus_idx], new_bus); | |
2327 | synchronize_srcu_expedited(&kvm->srcu); | |
2328 | kfree(bus); | |
2329 | return r; | |
2eeb2e94 GH |
2330 | } |
2331 | ||
774c47f1 AK |
2332 | static struct notifier_block kvm_cpu_notifier = { |
2333 | .notifier_call = kvm_cpu_hotplug, | |
774c47f1 AK |
2334 | }; |
2335 | ||
8b88b099 | 2336 | static int vm_stat_get(void *_offset, u64 *val) |
ba1389b7 AK |
2337 | { |
2338 | unsigned offset = (long)_offset; | |
ba1389b7 AK |
2339 | struct kvm *kvm; |
2340 | ||
8b88b099 | 2341 | *val = 0; |
ba1389b7 AK |
2342 | spin_lock(&kvm_lock); |
2343 | list_for_each_entry(kvm, &vm_list, vm_list) | |
8b88b099 | 2344 | *val += *(u32 *)((void *)kvm + offset); |
ba1389b7 | 2345 | spin_unlock(&kvm_lock); |
8b88b099 | 2346 | return 0; |
ba1389b7 AK |
2347 | } |
2348 | ||
2349 | DEFINE_SIMPLE_ATTRIBUTE(vm_stat_fops, vm_stat_get, NULL, "%llu\n"); | |
2350 | ||
8b88b099 | 2351 | static int vcpu_stat_get(void *_offset, u64 *val) |
1165f5fe AK |
2352 | { |
2353 | unsigned offset = (long)_offset; | |
1165f5fe AK |
2354 | struct kvm *kvm; |
2355 | struct kvm_vcpu *vcpu; | |
2356 | int i; | |
2357 | ||
8b88b099 | 2358 | *val = 0; |
1165f5fe AK |
2359 | spin_lock(&kvm_lock); |
2360 | list_for_each_entry(kvm, &vm_list, vm_list) | |
988a2cae GN |
2361 | kvm_for_each_vcpu(i, vcpu, kvm) |
2362 | *val += *(u32 *)((void *)vcpu + offset); | |
2363 | ||
1165f5fe | 2364 | spin_unlock(&kvm_lock); |
8b88b099 | 2365 | return 0; |
1165f5fe AK |
2366 | } |
2367 | ||
ba1389b7 AK |
2368 | DEFINE_SIMPLE_ATTRIBUTE(vcpu_stat_fops, vcpu_stat_get, NULL, "%llu\n"); |
2369 | ||
828c0950 | 2370 | static const struct file_operations *stat_fops[] = { |
ba1389b7 AK |
2371 | [KVM_STAT_VCPU] = &vcpu_stat_fops, |
2372 | [KVM_STAT_VM] = &vm_stat_fops, | |
2373 | }; | |
1165f5fe | 2374 | |
a16b043c | 2375 | static void kvm_init_debug(void) |
6aa8b732 AK |
2376 | { |
2377 | struct kvm_stats_debugfs_item *p; | |
2378 | ||
76f7c879 | 2379 | kvm_debugfs_dir = debugfs_create_dir("kvm", NULL); |
6aa8b732 | 2380 | for (p = debugfs_entries; p->name; ++p) |
76f7c879 | 2381 | p->dentry = debugfs_create_file(p->name, 0444, kvm_debugfs_dir, |
1165f5fe | 2382 | (void *)(long)p->offset, |
ba1389b7 | 2383 | stat_fops[p->kind]); |
6aa8b732 AK |
2384 | } |
2385 | ||
2386 | static void kvm_exit_debug(void) | |
2387 | { | |
2388 | struct kvm_stats_debugfs_item *p; | |
2389 | ||
2390 | for (p = debugfs_entries; p->name; ++p) | |
2391 | debugfs_remove(p->dentry); | |
76f7c879 | 2392 | debugfs_remove(kvm_debugfs_dir); |
6aa8b732 AK |
2393 | } |
2394 | ||
59ae6c6b AK |
2395 | static int kvm_suspend(struct sys_device *dev, pm_message_t state) |
2396 | { | |
10474ae8 | 2397 | if (kvm_usage_count) |
75b7127c | 2398 | hardware_disable_nolock(NULL); |
59ae6c6b AK |
2399 | return 0; |
2400 | } | |
2401 | ||
2402 | static int kvm_resume(struct sys_device *dev) | |
2403 | { | |
ca84d1a2 ZA |
2404 | if (kvm_usage_count) { |
2405 | WARN_ON(spin_is_locked(&kvm_lock)); | |
75b7127c | 2406 | hardware_enable_nolock(NULL); |
ca84d1a2 | 2407 | } |
59ae6c6b AK |
2408 | return 0; |
2409 | } | |
2410 | ||
2411 | static struct sysdev_class kvm_sysdev_class = { | |
af5ca3f4 | 2412 | .name = "kvm", |
59ae6c6b AK |
2413 | .suspend = kvm_suspend, |
2414 | .resume = kvm_resume, | |
2415 | }; | |
2416 | ||
2417 | static struct sys_device kvm_sysdev = { | |
2418 | .id = 0, | |
2419 | .cls = &kvm_sysdev_class, | |
2420 | }; | |
2421 | ||
cea7bb21 | 2422 | struct page *bad_page; |
35149e21 | 2423 | pfn_t bad_pfn; |
6aa8b732 | 2424 | |
15ad7146 AK |
2425 | static inline |
2426 | struct kvm_vcpu *preempt_notifier_to_vcpu(struct preempt_notifier *pn) | |
2427 | { | |
2428 | return container_of(pn, struct kvm_vcpu, preempt_notifier); | |
2429 | } | |
2430 | ||
2431 | static void kvm_sched_in(struct preempt_notifier *pn, int cpu) | |
2432 | { | |
2433 | struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn); | |
2434 | ||
e9b11c17 | 2435 | kvm_arch_vcpu_load(vcpu, cpu); |
15ad7146 AK |
2436 | } |
2437 | ||
2438 | static void kvm_sched_out(struct preempt_notifier *pn, | |
2439 | struct task_struct *next) | |
2440 | { | |
2441 | struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn); | |
2442 | ||
e9b11c17 | 2443 | kvm_arch_vcpu_put(vcpu); |
15ad7146 AK |
2444 | } |
2445 | ||
0ee75bea | 2446 | int kvm_init(void *opaque, unsigned vcpu_size, unsigned vcpu_align, |
c16f862d | 2447 | struct module *module) |
6aa8b732 AK |
2448 | { |
2449 | int r; | |
002c7f7c | 2450 | int cpu; |
6aa8b732 | 2451 | |
f8c16bba ZX |
2452 | r = kvm_arch_init(opaque); |
2453 | if (r) | |
d2308784 | 2454 | goto out_fail; |
cb498ea2 ZX |
2455 | |
2456 | bad_page = alloc_page(GFP_KERNEL | __GFP_ZERO); | |
2457 | ||
2458 | if (bad_page == NULL) { | |
2459 | r = -ENOMEM; | |
2460 | goto out; | |
2461 | } | |
2462 | ||
35149e21 AL |
2463 | bad_pfn = page_to_pfn(bad_page); |
2464 | ||
bf998156 HY |
2465 | hwpoison_page = alloc_page(GFP_KERNEL | __GFP_ZERO); |
2466 | ||
2467 | if (hwpoison_page == NULL) { | |
2468 | r = -ENOMEM; | |
2469 | goto out_free_0; | |
2470 | } | |
2471 | ||
2472 | hwpoison_pfn = page_to_pfn(hwpoison_page); | |
2473 | ||
edba23e5 GN |
2474 | fault_page = alloc_page(GFP_KERNEL | __GFP_ZERO); |
2475 | ||
2476 | if (fault_page == NULL) { | |
2477 | r = -ENOMEM; | |
2478 | goto out_free_0; | |
2479 | } | |
2480 | ||
2481 | fault_pfn = page_to_pfn(fault_page); | |
2482 | ||
8437a617 | 2483 | if (!zalloc_cpumask_var(&cpus_hardware_enabled, GFP_KERNEL)) { |
7f59f492 RR |
2484 | r = -ENOMEM; |
2485 | goto out_free_0; | |
2486 | } | |
2487 | ||
e9b11c17 | 2488 | r = kvm_arch_hardware_setup(); |
6aa8b732 | 2489 | if (r < 0) |
7f59f492 | 2490 | goto out_free_0a; |
6aa8b732 | 2491 | |
002c7f7c YS |
2492 | for_each_online_cpu(cpu) { |
2493 | smp_call_function_single(cpu, | |
e9b11c17 | 2494 | kvm_arch_check_processor_compat, |
8691e5a8 | 2495 | &r, 1); |
002c7f7c | 2496 | if (r < 0) |
d2308784 | 2497 | goto out_free_1; |
002c7f7c YS |
2498 | } |
2499 | ||
774c47f1 AK |
2500 | r = register_cpu_notifier(&kvm_cpu_notifier); |
2501 | if (r) | |
d2308784 | 2502 | goto out_free_2; |
6aa8b732 AK |
2503 | register_reboot_notifier(&kvm_reboot_notifier); |
2504 | ||
59ae6c6b AK |
2505 | r = sysdev_class_register(&kvm_sysdev_class); |
2506 | if (r) | |
d2308784 | 2507 | goto out_free_3; |
59ae6c6b AK |
2508 | |
2509 | r = sysdev_register(&kvm_sysdev); | |
2510 | if (r) | |
d2308784 | 2511 | goto out_free_4; |
59ae6c6b | 2512 | |
c16f862d | 2513 | /* A kmem cache lets us meet the alignment requirements of fx_save. */ |
0ee75bea AK |
2514 | if (!vcpu_align) |
2515 | vcpu_align = __alignof__(struct kvm_vcpu); | |
2516 | kvm_vcpu_cache = kmem_cache_create("kvm_vcpu", vcpu_size, vcpu_align, | |
56919c5c | 2517 | 0, NULL); |
c16f862d RR |
2518 | if (!kvm_vcpu_cache) { |
2519 | r = -ENOMEM; | |
d2308784 | 2520 | goto out_free_5; |
c16f862d RR |
2521 | } |
2522 | ||
af585b92 GN |
2523 | r = kvm_async_pf_init(); |
2524 | if (r) | |
2525 | goto out_free; | |
2526 | ||
6aa8b732 | 2527 | kvm_chardev_ops.owner = module; |
3d3aab1b CB |
2528 | kvm_vm_fops.owner = module; |
2529 | kvm_vcpu_fops.owner = module; | |
6aa8b732 AK |
2530 | |
2531 | r = misc_register(&kvm_dev); | |
2532 | if (r) { | |
d77c26fc | 2533 | printk(KERN_ERR "kvm: misc device register failed\n"); |
af585b92 | 2534 | goto out_unreg; |
6aa8b732 AK |
2535 | } |
2536 | ||
15ad7146 AK |
2537 | kvm_preempt_ops.sched_in = kvm_sched_in; |
2538 | kvm_preempt_ops.sched_out = kvm_sched_out; | |
2539 | ||
0ea4ed8e DW |
2540 | kvm_init_debug(); |
2541 | ||
c7addb90 | 2542 | return 0; |
6aa8b732 | 2543 | |
af585b92 GN |
2544 | out_unreg: |
2545 | kvm_async_pf_deinit(); | |
6aa8b732 | 2546 | out_free: |
c16f862d | 2547 | kmem_cache_destroy(kvm_vcpu_cache); |
d2308784 | 2548 | out_free_5: |
59ae6c6b | 2549 | sysdev_unregister(&kvm_sysdev); |
d2308784 | 2550 | out_free_4: |
59ae6c6b | 2551 | sysdev_class_unregister(&kvm_sysdev_class); |
d2308784 | 2552 | out_free_3: |
6aa8b732 | 2553 | unregister_reboot_notifier(&kvm_reboot_notifier); |
774c47f1 | 2554 | unregister_cpu_notifier(&kvm_cpu_notifier); |
d2308784 | 2555 | out_free_2: |
d2308784 | 2556 | out_free_1: |
e9b11c17 | 2557 | kvm_arch_hardware_unsetup(); |
7f59f492 RR |
2558 | out_free_0a: |
2559 | free_cpumask_var(cpus_hardware_enabled); | |
d2308784 | 2560 | out_free_0: |
edba23e5 GN |
2561 | if (fault_page) |
2562 | __free_page(fault_page); | |
bf998156 HY |
2563 | if (hwpoison_page) |
2564 | __free_page(hwpoison_page); | |
d2308784 | 2565 | __free_page(bad_page); |
ca45aaae | 2566 | out: |
f8c16bba | 2567 | kvm_arch_exit(); |
d2308784 | 2568 | out_fail: |
6aa8b732 AK |
2569 | return r; |
2570 | } | |
cb498ea2 | 2571 | EXPORT_SYMBOL_GPL(kvm_init); |
6aa8b732 | 2572 | |
cb498ea2 | 2573 | void kvm_exit(void) |
6aa8b732 | 2574 | { |
0ea4ed8e | 2575 | kvm_exit_debug(); |
6aa8b732 | 2576 | misc_deregister(&kvm_dev); |
c16f862d | 2577 | kmem_cache_destroy(kvm_vcpu_cache); |
af585b92 | 2578 | kvm_async_pf_deinit(); |
59ae6c6b AK |
2579 | sysdev_unregister(&kvm_sysdev); |
2580 | sysdev_class_unregister(&kvm_sysdev_class); | |
6aa8b732 | 2581 | unregister_reboot_notifier(&kvm_reboot_notifier); |
59ae6c6b | 2582 | unregister_cpu_notifier(&kvm_cpu_notifier); |
75b7127c | 2583 | on_each_cpu(hardware_disable_nolock, NULL, 1); |
e9b11c17 | 2584 | kvm_arch_hardware_unsetup(); |
f8c16bba | 2585 | kvm_arch_exit(); |
7f59f492 | 2586 | free_cpumask_var(cpus_hardware_enabled); |
bf998156 | 2587 | __free_page(hwpoison_page); |
cea7bb21 | 2588 | __free_page(bad_page); |
6aa8b732 | 2589 | } |
cb498ea2 | 2590 | EXPORT_SYMBOL_GPL(kvm_exit); |