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Commit | Line | Data |
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6aa8b732 AK |
1 | /* |
2 | * Kernel-based Virtual Machine driver for Linux | |
3 | * | |
4 | * This module enables machines with Intel VT-x extensions to run virtual | |
5 | * machines without emulation or binary translation. | |
6 | * | |
7 | * Copyright (C) 2006 Qumranet, Inc. | |
8 | * | |
9 | * Authors: | |
10 | * Avi Kivity <avi@qumranet.com> | |
11 | * Yaniv Kamay <yaniv@qumranet.com> | |
12 | * | |
13 | * This work is licensed under the terms of the GNU GPL, version 2. See | |
14 | * the COPYING file in the top-level directory. | |
15 | * | |
16 | */ | |
17 | ||
e2174021 | 18 | #include "iodev.h" |
6aa8b732 | 19 | |
edf88417 | 20 | #include <linux/kvm_host.h> |
6aa8b732 AK |
21 | #include <linux/kvm.h> |
22 | #include <linux/module.h> | |
23 | #include <linux/errno.h> | |
6aa8b732 AK |
24 | #include <linux/percpu.h> |
25 | #include <linux/gfp.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> |
6aa8b732 | 47 | |
e495606d | 48 | #include <asm/processor.h> |
e495606d AK |
49 | #include <asm/io.h> |
50 | #include <asm/uaccess.h> | |
3e021bf5 | 51 | #include <asm/pgtable.h> |
c8240bd6 | 52 | #include <asm-generic/bitops/le.h> |
6aa8b732 | 53 | |
5f94c174 | 54 | #include "coalesced_mmio.h" |
5f94c174 | 55 | |
229456fc MT |
56 | #define CREATE_TRACE_POINTS |
57 | #include <trace/events/kvm.h> | |
58 | ||
6aa8b732 AK |
59 | MODULE_AUTHOR("Qumranet"); |
60 | MODULE_LICENSE("GPL"); | |
61 | ||
fa40a821 MT |
62 | /* |
63 | * Ordering of locks: | |
64 | * | |
fae3a353 | 65 | * kvm->lock --> kvm->slots_lock --> kvm->irq_lock |
fa40a821 MT |
66 | */ |
67 | ||
e9b11c17 ZX |
68 | DEFINE_SPINLOCK(kvm_lock); |
69 | LIST_HEAD(vm_list); | |
133de902 | 70 | |
7f59f492 | 71 | static cpumask_var_t cpus_hardware_enabled; |
10474ae8 AG |
72 | static int kvm_usage_count = 0; |
73 | static atomic_t hardware_enable_failed; | |
1b6c0168 | 74 | |
c16f862d RR |
75 | struct kmem_cache *kvm_vcpu_cache; |
76 | EXPORT_SYMBOL_GPL(kvm_vcpu_cache); | |
1165f5fe | 77 | |
15ad7146 AK |
78 | static __read_mostly struct preempt_ops kvm_preempt_ops; |
79 | ||
76f7c879 | 80 | struct dentry *kvm_debugfs_dir; |
6aa8b732 | 81 | |
bccf2150 AK |
82 | static long kvm_vcpu_ioctl(struct file *file, unsigned int ioctl, |
83 | unsigned long arg); | |
10474ae8 AG |
84 | static int hardware_enable_all(void); |
85 | static void hardware_disable_all(void); | |
bccf2150 | 86 | |
e8ba5d31 | 87 | static bool kvm_rebooting; |
4ecac3fd | 88 | |
54dee993 MT |
89 | static bool largepages_enabled = true; |
90 | ||
c77fb9dc | 91 | inline int kvm_is_mmio_pfn(pfn_t pfn) |
cbff90a7 | 92 | { |
fc5659c8 JR |
93 | if (pfn_valid(pfn)) { |
94 | struct page *page = compound_head(pfn_to_page(pfn)); | |
95 | return PageReserved(page); | |
96 | } | |
cbff90a7 BAY |
97 | |
98 | return true; | |
99 | } | |
100 | ||
bccf2150 AK |
101 | /* |
102 | * Switches to specified vcpu, until a matching vcpu_put() | |
103 | */ | |
313a3dc7 | 104 | void vcpu_load(struct kvm_vcpu *vcpu) |
6aa8b732 | 105 | { |
15ad7146 AK |
106 | int cpu; |
107 | ||
bccf2150 | 108 | mutex_lock(&vcpu->mutex); |
15ad7146 AK |
109 | cpu = get_cpu(); |
110 | preempt_notifier_register(&vcpu->preempt_notifier); | |
313a3dc7 | 111 | kvm_arch_vcpu_load(vcpu, cpu); |
15ad7146 | 112 | put_cpu(); |
6aa8b732 AK |
113 | } |
114 | ||
313a3dc7 | 115 | void vcpu_put(struct kvm_vcpu *vcpu) |
6aa8b732 | 116 | { |
15ad7146 | 117 | preempt_disable(); |
313a3dc7 | 118 | kvm_arch_vcpu_put(vcpu); |
15ad7146 AK |
119 | preempt_notifier_unregister(&vcpu->preempt_notifier); |
120 | preempt_enable(); | |
6aa8b732 AK |
121 | mutex_unlock(&vcpu->mutex); |
122 | } | |
123 | ||
d9e368d6 AK |
124 | static void ack_flush(void *_completed) |
125 | { | |
d9e368d6 AK |
126 | } |
127 | ||
49846896 | 128 | static bool make_all_cpus_request(struct kvm *kvm, unsigned int req) |
d9e368d6 | 129 | { |
597a5f55 | 130 | int i, cpu, me; |
6ef7a1bc RR |
131 | cpumask_var_t cpus; |
132 | bool called = true; | |
d9e368d6 | 133 | struct kvm_vcpu *vcpu; |
d9e368d6 | 134 | |
79f55997 | 135 | zalloc_cpumask_var(&cpus, GFP_ATOMIC); |
6ef7a1bc | 136 | |
84261923 | 137 | spin_lock(&kvm->requests_lock); |
e601e3be | 138 | me = smp_processor_id(); |
988a2cae | 139 | kvm_for_each_vcpu(i, vcpu, kvm) { |
49846896 | 140 | if (test_and_set_bit(req, &vcpu->requests)) |
d9e368d6 AK |
141 | continue; |
142 | cpu = vcpu->cpu; | |
6ef7a1bc RR |
143 | if (cpus != NULL && cpu != -1 && cpu != me) |
144 | cpumask_set_cpu(cpu, cpus); | |
49846896 | 145 | } |
6ef7a1bc RR |
146 | if (unlikely(cpus == NULL)) |
147 | smp_call_function_many(cpu_online_mask, ack_flush, NULL, 1); | |
148 | else if (!cpumask_empty(cpus)) | |
149 | smp_call_function_many(cpus, ack_flush, NULL, 1); | |
150 | else | |
151 | called = false; | |
84261923 | 152 | spin_unlock(&kvm->requests_lock); |
6ef7a1bc | 153 | free_cpumask_var(cpus); |
49846896 | 154 | return called; |
d9e368d6 AK |
155 | } |
156 | ||
49846896 | 157 | void kvm_flush_remote_tlbs(struct kvm *kvm) |
2e53d63a | 158 | { |
49846896 RR |
159 | if (make_all_cpus_request(kvm, KVM_REQ_TLB_FLUSH)) |
160 | ++kvm->stat.remote_tlb_flush; | |
2e53d63a MT |
161 | } |
162 | ||
49846896 RR |
163 | void kvm_reload_remote_mmus(struct kvm *kvm) |
164 | { | |
165 | make_all_cpus_request(kvm, KVM_REQ_MMU_RELOAD); | |
166 | } | |
2e53d63a | 167 | |
fb3f0f51 RR |
168 | int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id) |
169 | { | |
170 | struct page *page; | |
171 | int r; | |
172 | ||
173 | mutex_init(&vcpu->mutex); | |
174 | vcpu->cpu = -1; | |
fb3f0f51 RR |
175 | vcpu->kvm = kvm; |
176 | vcpu->vcpu_id = id; | |
b6958ce4 | 177 | init_waitqueue_head(&vcpu->wq); |
fb3f0f51 RR |
178 | |
179 | page = alloc_page(GFP_KERNEL | __GFP_ZERO); | |
180 | if (!page) { | |
181 | r = -ENOMEM; | |
182 | goto fail; | |
183 | } | |
184 | vcpu->run = page_address(page); | |
185 | ||
e9b11c17 | 186 | r = kvm_arch_vcpu_init(vcpu); |
fb3f0f51 | 187 | if (r < 0) |
e9b11c17 | 188 | goto fail_free_run; |
fb3f0f51 RR |
189 | return 0; |
190 | ||
fb3f0f51 RR |
191 | fail_free_run: |
192 | free_page((unsigned long)vcpu->run); | |
193 | fail: | |
76fafa5e | 194 | return r; |
fb3f0f51 RR |
195 | } |
196 | EXPORT_SYMBOL_GPL(kvm_vcpu_init); | |
197 | ||
198 | void kvm_vcpu_uninit(struct kvm_vcpu *vcpu) | |
199 | { | |
e9b11c17 | 200 | kvm_arch_vcpu_uninit(vcpu); |
fb3f0f51 RR |
201 | free_page((unsigned long)vcpu->run); |
202 | } | |
203 | EXPORT_SYMBOL_GPL(kvm_vcpu_uninit); | |
204 | ||
e930bffe AA |
205 | #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER) |
206 | static inline struct kvm *mmu_notifier_to_kvm(struct mmu_notifier *mn) | |
207 | { | |
208 | return container_of(mn, struct kvm, mmu_notifier); | |
209 | } | |
210 | ||
211 | static void kvm_mmu_notifier_invalidate_page(struct mmu_notifier *mn, | |
212 | struct mm_struct *mm, | |
213 | unsigned long address) | |
214 | { | |
215 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
216 | int need_tlb_flush; | |
217 | ||
218 | /* | |
219 | * When ->invalidate_page runs, the linux pte has been zapped | |
220 | * already but the page is still allocated until | |
221 | * ->invalidate_page returns. So if we increase the sequence | |
222 | * here the kvm page fault will notice if the spte can't be | |
223 | * established because the page is going to be freed. If | |
224 | * instead the kvm page fault establishes the spte before | |
225 | * ->invalidate_page runs, kvm_unmap_hva will release it | |
226 | * before returning. | |
227 | * | |
228 | * The sequence increase only need to be seen at spin_unlock | |
229 | * time, and not at spin_lock time. | |
230 | * | |
231 | * Increasing the sequence after the spin_unlock would be | |
232 | * unsafe because the kvm page fault could then establish the | |
233 | * pte after kvm_unmap_hva returned, without noticing the page | |
234 | * is going to be freed. | |
235 | */ | |
236 | spin_lock(&kvm->mmu_lock); | |
237 | kvm->mmu_notifier_seq++; | |
238 | need_tlb_flush = kvm_unmap_hva(kvm, address); | |
239 | spin_unlock(&kvm->mmu_lock); | |
240 | ||
241 | /* we've to flush the tlb before the pages can be freed */ | |
242 | if (need_tlb_flush) | |
243 | kvm_flush_remote_tlbs(kvm); | |
244 | ||
245 | } | |
246 | ||
3da0dd43 IE |
247 | static void kvm_mmu_notifier_change_pte(struct mmu_notifier *mn, |
248 | struct mm_struct *mm, | |
249 | unsigned long address, | |
250 | pte_t pte) | |
251 | { | |
252 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
253 | ||
254 | spin_lock(&kvm->mmu_lock); | |
255 | kvm->mmu_notifier_seq++; | |
256 | kvm_set_spte_hva(kvm, address, pte); | |
257 | spin_unlock(&kvm->mmu_lock); | |
258 | } | |
259 | ||
e930bffe AA |
260 | static void kvm_mmu_notifier_invalidate_range_start(struct mmu_notifier *mn, |
261 | struct mm_struct *mm, | |
262 | unsigned long start, | |
263 | unsigned long end) | |
264 | { | |
265 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
266 | int need_tlb_flush = 0; | |
267 | ||
268 | spin_lock(&kvm->mmu_lock); | |
269 | /* | |
270 | * The count increase must become visible at unlock time as no | |
271 | * spte can be established without taking the mmu_lock and | |
272 | * count is also read inside the mmu_lock critical section. | |
273 | */ | |
274 | kvm->mmu_notifier_count++; | |
275 | for (; start < end; start += PAGE_SIZE) | |
276 | need_tlb_flush |= kvm_unmap_hva(kvm, start); | |
277 | spin_unlock(&kvm->mmu_lock); | |
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 | static void kvm_mmu_notifier_invalidate_range_end(struct mmu_notifier *mn, | |
285 | struct mm_struct *mm, | |
286 | unsigned long start, | |
287 | unsigned long end) | |
288 | { | |
289 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
290 | ||
291 | spin_lock(&kvm->mmu_lock); | |
292 | /* | |
293 | * This sequence increase will notify the kvm page fault that | |
294 | * the page that is going to be mapped in the spte could have | |
295 | * been freed. | |
296 | */ | |
297 | kvm->mmu_notifier_seq++; | |
298 | /* | |
299 | * The above sequence increase must be visible before the | |
300 | * below count decrease but both values are read by the kvm | |
301 | * page fault under mmu_lock spinlock so we don't need to add | |
302 | * a smb_wmb() here in between the two. | |
303 | */ | |
304 | kvm->mmu_notifier_count--; | |
305 | spin_unlock(&kvm->mmu_lock); | |
306 | ||
307 | BUG_ON(kvm->mmu_notifier_count < 0); | |
308 | } | |
309 | ||
310 | static int kvm_mmu_notifier_clear_flush_young(struct mmu_notifier *mn, | |
311 | struct mm_struct *mm, | |
312 | unsigned long address) | |
313 | { | |
314 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
315 | int young; | |
316 | ||
317 | spin_lock(&kvm->mmu_lock); | |
318 | young = kvm_age_hva(kvm, address); | |
319 | spin_unlock(&kvm->mmu_lock); | |
320 | ||
321 | if (young) | |
322 | kvm_flush_remote_tlbs(kvm); | |
323 | ||
324 | return young; | |
325 | } | |
326 | ||
85db06e5 MT |
327 | static void kvm_mmu_notifier_release(struct mmu_notifier *mn, |
328 | struct mm_struct *mm) | |
329 | { | |
330 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
331 | kvm_arch_flush_shadow(kvm); | |
332 | } | |
333 | ||
e930bffe AA |
334 | static const struct mmu_notifier_ops kvm_mmu_notifier_ops = { |
335 | .invalidate_page = kvm_mmu_notifier_invalidate_page, | |
336 | .invalidate_range_start = kvm_mmu_notifier_invalidate_range_start, | |
337 | .invalidate_range_end = kvm_mmu_notifier_invalidate_range_end, | |
338 | .clear_flush_young = kvm_mmu_notifier_clear_flush_young, | |
3da0dd43 | 339 | .change_pte = kvm_mmu_notifier_change_pte, |
85db06e5 | 340 | .release = kvm_mmu_notifier_release, |
e930bffe | 341 | }; |
4c07b0a4 AK |
342 | |
343 | static int kvm_init_mmu_notifier(struct kvm *kvm) | |
344 | { | |
345 | kvm->mmu_notifier.ops = &kvm_mmu_notifier_ops; | |
346 | return mmu_notifier_register(&kvm->mmu_notifier, current->mm); | |
347 | } | |
348 | ||
349 | #else /* !(CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER) */ | |
350 | ||
351 | static int kvm_init_mmu_notifier(struct kvm *kvm) | |
352 | { | |
353 | return 0; | |
354 | } | |
355 | ||
e930bffe AA |
356 | #endif /* CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER */ |
357 | ||
f17abe9a | 358 | static struct kvm *kvm_create_vm(void) |
6aa8b732 | 359 | { |
10474ae8 | 360 | int r = 0; |
d19a9cd2 | 361 | struct kvm *kvm = kvm_arch_create_vm(); |
5f94c174 LV |
362 | #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET |
363 | struct page *page; | |
364 | #endif | |
6aa8b732 | 365 | |
d19a9cd2 ZX |
366 | if (IS_ERR(kvm)) |
367 | goto out; | |
10474ae8 AG |
368 | |
369 | r = hardware_enable_all(); | |
370 | if (r) | |
371 | goto out_err_nodisable; | |
372 | ||
75858a84 AK |
373 | #ifdef CONFIG_HAVE_KVM_IRQCHIP |
374 | INIT_HLIST_HEAD(&kvm->mask_notifier_list); | |
136bdfee | 375 | INIT_HLIST_HEAD(&kvm->irq_ack_notifier_list); |
75858a84 | 376 | #endif |
6aa8b732 | 377 | |
46a26bf5 MT |
378 | r = -ENOMEM; |
379 | kvm->memslots = kzalloc(sizeof(struct kvm_memslots), GFP_KERNEL); | |
380 | if (!kvm->memslots) | |
381 | goto out_err; | |
382 | ||
5f94c174 LV |
383 | #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET |
384 | page = alloc_page(GFP_KERNEL | __GFP_ZERO); | |
46a26bf5 | 385 | if (!page) |
10474ae8 | 386 | goto out_err; |
46a26bf5 | 387 | |
5f94c174 LV |
388 | kvm->coalesced_mmio_ring = |
389 | (struct kvm_coalesced_mmio_ring *)page_address(page); | |
390 | #endif | |
391 | ||
4c07b0a4 | 392 | r = kvm_init_mmu_notifier(kvm); |
283d0c65 | 393 | if (r) { |
e930bffe | 394 | #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET |
283d0c65 | 395 | put_page(page); |
e930bffe | 396 | #endif |
283d0c65 | 397 | goto out_err; |
e930bffe | 398 | } |
e930bffe | 399 | |
6d4e4c4f AK |
400 | kvm->mm = current->mm; |
401 | atomic_inc(&kvm->mm->mm_count); | |
aaee2c94 | 402 | spin_lock_init(&kvm->mmu_lock); |
84261923 | 403 | spin_lock_init(&kvm->requests_lock); |
74906345 | 404 | kvm_io_bus_init(&kvm->pio_bus); |
d34e6b17 | 405 | kvm_eventfd_init(kvm); |
11ec2804 | 406 | mutex_init(&kvm->lock); |
60eead79 | 407 | mutex_init(&kvm->irq_lock); |
2eeb2e94 | 408 | kvm_io_bus_init(&kvm->mmio_bus); |
72dc67a6 | 409 | init_rwsem(&kvm->slots_lock); |
d39f13b0 | 410 | atomic_set(&kvm->users_count, 1); |
5e58cfe4 RR |
411 | spin_lock(&kvm_lock); |
412 | list_add(&kvm->vm_list, &vm_list); | |
413 | spin_unlock(&kvm_lock); | |
5f94c174 LV |
414 | #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET |
415 | kvm_coalesced_mmio_init(kvm); | |
416 | #endif | |
d19a9cd2 | 417 | out: |
f17abe9a | 418 | return kvm; |
10474ae8 AG |
419 | |
420 | out_err: | |
421 | hardware_disable_all(); | |
422 | out_err_nodisable: | |
46a26bf5 | 423 | kfree(kvm->memslots); |
10474ae8 AG |
424 | kfree(kvm); |
425 | return ERR_PTR(r); | |
f17abe9a AK |
426 | } |
427 | ||
6aa8b732 AK |
428 | /* |
429 | * Free any memory in @free but not in @dont. | |
430 | */ | |
431 | static void kvm_free_physmem_slot(struct kvm_memory_slot *free, | |
432 | struct kvm_memory_slot *dont) | |
433 | { | |
ec04b260 JR |
434 | int i; |
435 | ||
290fc38d IE |
436 | if (!dont || free->rmap != dont->rmap) |
437 | vfree(free->rmap); | |
6aa8b732 AK |
438 | |
439 | if (!dont || free->dirty_bitmap != dont->dirty_bitmap) | |
440 | vfree(free->dirty_bitmap); | |
441 | ||
ec04b260 JR |
442 | |
443 | for (i = 0; i < KVM_NR_PAGE_SIZES - 1; ++i) { | |
444 | if (!dont || free->lpage_info[i] != dont->lpage_info[i]) { | |
445 | vfree(free->lpage_info[i]); | |
446 | free->lpage_info[i] = NULL; | |
447 | } | |
448 | } | |
05da4558 | 449 | |
6aa8b732 | 450 | free->npages = 0; |
8b6d44c7 | 451 | free->dirty_bitmap = NULL; |
8d4e1288 | 452 | free->rmap = NULL; |
6aa8b732 AK |
453 | } |
454 | ||
d19a9cd2 | 455 | void kvm_free_physmem(struct kvm *kvm) |
6aa8b732 AK |
456 | { |
457 | int i; | |
46a26bf5 MT |
458 | struct kvm_memslots *slots = kvm->memslots; |
459 | ||
460 | for (i = 0; i < slots->nmemslots; ++i) | |
461 | kvm_free_physmem_slot(&slots->memslots[i], NULL); | |
6aa8b732 | 462 | |
46a26bf5 | 463 | kfree(kvm->memslots); |
6aa8b732 AK |
464 | } |
465 | ||
f17abe9a AK |
466 | static void kvm_destroy_vm(struct kvm *kvm) |
467 | { | |
6d4e4c4f AK |
468 | struct mm_struct *mm = kvm->mm; |
469 | ||
ad8ba2cd | 470 | kvm_arch_sync_events(kvm); |
133de902 AK |
471 | spin_lock(&kvm_lock); |
472 | list_del(&kvm->vm_list); | |
473 | spin_unlock(&kvm_lock); | |
399ec807 | 474 | kvm_free_irq_routing(kvm); |
74906345 | 475 | kvm_io_bus_destroy(&kvm->pio_bus); |
2eeb2e94 | 476 | kvm_io_bus_destroy(&kvm->mmio_bus); |
980da6ce | 477 | kvm_coalesced_mmio_free(kvm); |
e930bffe AA |
478 | #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER) |
479 | mmu_notifier_unregister(&kvm->mmu_notifier, kvm->mm); | |
f00be0ca GN |
480 | #else |
481 | kvm_arch_flush_shadow(kvm); | |
5f94c174 | 482 | #endif |
d19a9cd2 | 483 | kvm_arch_destroy_vm(kvm); |
10474ae8 | 484 | hardware_disable_all(); |
6d4e4c4f | 485 | mmdrop(mm); |
f17abe9a AK |
486 | } |
487 | ||
d39f13b0 IE |
488 | void kvm_get_kvm(struct kvm *kvm) |
489 | { | |
490 | atomic_inc(&kvm->users_count); | |
491 | } | |
492 | EXPORT_SYMBOL_GPL(kvm_get_kvm); | |
493 | ||
494 | void kvm_put_kvm(struct kvm *kvm) | |
495 | { | |
496 | if (atomic_dec_and_test(&kvm->users_count)) | |
497 | kvm_destroy_vm(kvm); | |
498 | } | |
499 | EXPORT_SYMBOL_GPL(kvm_put_kvm); | |
500 | ||
501 | ||
f17abe9a AK |
502 | static int kvm_vm_release(struct inode *inode, struct file *filp) |
503 | { | |
504 | struct kvm *kvm = filp->private_data; | |
505 | ||
721eecbf GH |
506 | kvm_irqfd_release(kvm); |
507 | ||
d39f13b0 | 508 | kvm_put_kvm(kvm); |
6aa8b732 AK |
509 | return 0; |
510 | } | |
511 | ||
6aa8b732 AK |
512 | /* |
513 | * Allocate some memory and give it an address in the guest physical address | |
514 | * space. | |
515 | * | |
516 | * Discontiguous memory is allowed, mostly for framebuffers. | |
f78e0e2e | 517 | * |
10589a46 | 518 | * Must be called holding mmap_sem for write. |
6aa8b732 | 519 | */ |
f78e0e2e SY |
520 | int __kvm_set_memory_region(struct kvm *kvm, |
521 | struct kvm_userspace_memory_region *mem, | |
522 | int user_alloc) | |
6aa8b732 AK |
523 | { |
524 | int r; | |
525 | gfn_t base_gfn; | |
28bcb112 HC |
526 | unsigned long npages; |
527 | unsigned long i; | |
6aa8b732 AK |
528 | struct kvm_memory_slot *memslot; |
529 | struct kvm_memory_slot old, new; | |
6aa8b732 AK |
530 | |
531 | r = -EINVAL; | |
532 | /* General sanity checks */ | |
533 | if (mem->memory_size & (PAGE_SIZE - 1)) | |
534 | goto out; | |
535 | if (mem->guest_phys_addr & (PAGE_SIZE - 1)) | |
536 | goto out; | |
e7cacd40 | 537 | if (user_alloc && (mem->userspace_addr & (PAGE_SIZE - 1))) |
78749809 | 538 | goto out; |
e0d62c7f | 539 | if (mem->slot >= KVM_MEMORY_SLOTS + KVM_PRIVATE_MEM_SLOTS) |
6aa8b732 AK |
540 | goto out; |
541 | if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr) | |
542 | goto out; | |
543 | ||
46a26bf5 | 544 | memslot = &kvm->memslots->memslots[mem->slot]; |
6aa8b732 AK |
545 | base_gfn = mem->guest_phys_addr >> PAGE_SHIFT; |
546 | npages = mem->memory_size >> PAGE_SHIFT; | |
547 | ||
548 | if (!npages) | |
549 | mem->flags &= ~KVM_MEM_LOG_DIRTY_PAGES; | |
550 | ||
6aa8b732 AK |
551 | new = old = *memslot; |
552 | ||
553 | new.base_gfn = base_gfn; | |
554 | new.npages = npages; | |
555 | new.flags = mem->flags; | |
556 | ||
557 | /* Disallow changing a memory slot's size. */ | |
558 | r = -EINVAL; | |
559 | if (npages && old.npages && npages != old.npages) | |
f78e0e2e | 560 | goto out_free; |
6aa8b732 AK |
561 | |
562 | /* Check for overlaps */ | |
563 | r = -EEXIST; | |
564 | for (i = 0; i < KVM_MEMORY_SLOTS; ++i) { | |
46a26bf5 | 565 | struct kvm_memory_slot *s = &kvm->memslots->memslots[i]; |
6aa8b732 | 566 | |
4cd481f6 | 567 | if (s == memslot || !s->npages) |
6aa8b732 AK |
568 | continue; |
569 | if (!((base_gfn + npages <= s->base_gfn) || | |
570 | (base_gfn >= s->base_gfn + s->npages))) | |
f78e0e2e | 571 | goto out_free; |
6aa8b732 | 572 | } |
6aa8b732 | 573 | |
6aa8b732 AK |
574 | /* Free page dirty bitmap if unneeded */ |
575 | if (!(new.flags & KVM_MEM_LOG_DIRTY_PAGES)) | |
8b6d44c7 | 576 | new.dirty_bitmap = NULL; |
6aa8b732 AK |
577 | |
578 | r = -ENOMEM; | |
579 | ||
580 | /* Allocate if a slot is being created */ | |
eff0114a | 581 | #ifndef CONFIG_S390 |
8d4e1288 | 582 | if (npages && !new.rmap) { |
d77c26fc | 583 | new.rmap = vmalloc(npages * sizeof(struct page *)); |
290fc38d IE |
584 | |
585 | if (!new.rmap) | |
f78e0e2e | 586 | goto out_free; |
290fc38d | 587 | |
290fc38d | 588 | memset(new.rmap, 0, npages * sizeof(*new.rmap)); |
8d4e1288 | 589 | |
80b14b5b | 590 | new.user_alloc = user_alloc; |
604b38ac AA |
591 | /* |
592 | * hva_to_rmmap() serialzies with the mmu_lock and to be | |
593 | * safe it has to ignore memslots with !user_alloc && | |
594 | * !userspace_addr. | |
595 | */ | |
596 | if (user_alloc) | |
597 | new.userspace_addr = mem->userspace_addr; | |
598 | else | |
599 | new.userspace_addr = 0; | |
6aa8b732 | 600 | } |
ec04b260 JR |
601 | if (!npages) |
602 | goto skip_lpage; | |
05da4558 | 603 | |
ec04b260 | 604 | for (i = 0; i < KVM_NR_PAGE_SIZES - 1; ++i) { |
28bcb112 HC |
605 | unsigned long ugfn; |
606 | unsigned long j; | |
607 | int lpages; | |
ec04b260 | 608 | int level = i + 2; |
05da4558 | 609 | |
ec04b260 JR |
610 | /* Avoid unused variable warning if no large pages */ |
611 | (void)level; | |
612 | ||
613 | if (new.lpage_info[i]) | |
614 | continue; | |
615 | ||
616 | lpages = 1 + (base_gfn + npages - 1) / | |
617 | KVM_PAGES_PER_HPAGE(level); | |
618 | lpages -= base_gfn / KVM_PAGES_PER_HPAGE(level); | |
619 | ||
620 | new.lpage_info[i] = vmalloc(lpages * sizeof(*new.lpage_info[i])); | |
621 | ||
622 | if (!new.lpage_info[i]) | |
05da4558 MT |
623 | goto out_free; |
624 | ||
ec04b260 JR |
625 | memset(new.lpage_info[i], 0, |
626 | lpages * sizeof(*new.lpage_info[i])); | |
05da4558 | 627 | |
ec04b260 JR |
628 | if (base_gfn % KVM_PAGES_PER_HPAGE(level)) |
629 | new.lpage_info[i][0].write_count = 1; | |
630 | if ((base_gfn+npages) % KVM_PAGES_PER_HPAGE(level)) | |
631 | new.lpage_info[i][lpages - 1].write_count = 1; | |
ac04527f AK |
632 | ugfn = new.userspace_addr >> PAGE_SHIFT; |
633 | /* | |
634 | * If the gfn and userspace address are not aligned wrt each | |
54dee993 MT |
635 | * other, or if explicitly asked to, disable large page |
636 | * support for this slot | |
ac04527f | 637 | */ |
ec04b260 | 638 | if ((base_gfn ^ ugfn) & (KVM_PAGES_PER_HPAGE(level) - 1) || |
54dee993 | 639 | !largepages_enabled) |
ec04b260 JR |
640 | for (j = 0; j < lpages; ++j) |
641 | new.lpage_info[i][j].write_count = 1; | |
05da4558 | 642 | } |
6aa8b732 | 643 | |
ec04b260 JR |
644 | skip_lpage: |
645 | ||
6aa8b732 AK |
646 | /* Allocate page dirty bitmap if needed */ |
647 | if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) { | |
648 | unsigned dirty_bytes = ALIGN(npages, BITS_PER_LONG) / 8; | |
649 | ||
650 | new.dirty_bitmap = vmalloc(dirty_bytes); | |
651 | if (!new.dirty_bitmap) | |
f78e0e2e | 652 | goto out_free; |
6aa8b732 | 653 | memset(new.dirty_bitmap, 0, dirty_bytes); |
e244584f IE |
654 | if (old.npages) |
655 | kvm_arch_flush_shadow(kvm); | |
6aa8b732 | 656 | } |
3eea8437 CB |
657 | #else /* not defined CONFIG_S390 */ |
658 | new.user_alloc = user_alloc; | |
659 | if (user_alloc) | |
660 | new.userspace_addr = mem->userspace_addr; | |
eff0114a | 661 | #endif /* not defined CONFIG_S390 */ |
6aa8b732 | 662 | |
34d4cb8f MT |
663 | if (!npages) |
664 | kvm_arch_flush_shadow(kvm); | |
665 | ||
f7784b8e MT |
666 | r = kvm_arch_prepare_memory_region(kvm, &new, old, mem, user_alloc); |
667 | if (r) | |
668 | goto out_free; | |
669 | ||
604b38ac | 670 | spin_lock(&kvm->mmu_lock); |
46a26bf5 MT |
671 | if (mem->slot >= kvm->memslots->nmemslots) |
672 | kvm->memslots->nmemslots = mem->slot + 1; | |
604b38ac | 673 | |
3ad82a7e | 674 | *memslot = new; |
604b38ac | 675 | spin_unlock(&kvm->mmu_lock); |
3ad82a7e | 676 | |
f7784b8e | 677 | kvm_arch_commit_memory_region(kvm, mem, old, user_alloc); |
82ce2c96 | 678 | |
6f897248 GC |
679 | kvm_free_physmem_slot(&old, npages ? &new : NULL); |
680 | /* Slot deletion case: we have to update the current slot */ | |
b43b1901 | 681 | spin_lock(&kvm->mmu_lock); |
6f897248 GC |
682 | if (!npages) |
683 | *memslot = old; | |
b43b1901 | 684 | spin_unlock(&kvm->mmu_lock); |
8a98f664 | 685 | #ifdef CONFIG_DMAR |
62c476c7 BAY |
686 | /* map the pages in iommu page table */ |
687 | r = kvm_iommu_map_pages(kvm, base_gfn, npages); | |
688 | if (r) | |
689 | goto out; | |
8a98f664 | 690 | #endif |
6aa8b732 AK |
691 | return 0; |
692 | ||
f78e0e2e | 693 | out_free: |
6aa8b732 AK |
694 | kvm_free_physmem_slot(&new, &old); |
695 | out: | |
696 | return r; | |
210c7c4d IE |
697 | |
698 | } | |
f78e0e2e SY |
699 | EXPORT_SYMBOL_GPL(__kvm_set_memory_region); |
700 | ||
701 | int kvm_set_memory_region(struct kvm *kvm, | |
702 | struct kvm_userspace_memory_region *mem, | |
703 | int user_alloc) | |
704 | { | |
705 | int r; | |
706 | ||
72dc67a6 | 707 | down_write(&kvm->slots_lock); |
f78e0e2e | 708 | r = __kvm_set_memory_region(kvm, mem, user_alloc); |
72dc67a6 | 709 | up_write(&kvm->slots_lock); |
f78e0e2e SY |
710 | return r; |
711 | } | |
210c7c4d IE |
712 | EXPORT_SYMBOL_GPL(kvm_set_memory_region); |
713 | ||
1fe779f8 CO |
714 | int kvm_vm_ioctl_set_memory_region(struct kvm *kvm, |
715 | struct | |
716 | kvm_userspace_memory_region *mem, | |
717 | int user_alloc) | |
210c7c4d | 718 | { |
e0d62c7f IE |
719 | if (mem->slot >= KVM_MEMORY_SLOTS) |
720 | return -EINVAL; | |
210c7c4d | 721 | return kvm_set_memory_region(kvm, mem, user_alloc); |
6aa8b732 AK |
722 | } |
723 | ||
5bb064dc ZX |
724 | int kvm_get_dirty_log(struct kvm *kvm, |
725 | struct kvm_dirty_log *log, int *is_dirty) | |
6aa8b732 AK |
726 | { |
727 | struct kvm_memory_slot *memslot; | |
728 | int r, i; | |
729 | int n; | |
730 | unsigned long any = 0; | |
731 | ||
6aa8b732 AK |
732 | r = -EINVAL; |
733 | if (log->slot >= KVM_MEMORY_SLOTS) | |
734 | goto out; | |
735 | ||
46a26bf5 | 736 | memslot = &kvm->memslots->memslots[log->slot]; |
6aa8b732 AK |
737 | r = -ENOENT; |
738 | if (!memslot->dirty_bitmap) | |
739 | goto out; | |
740 | ||
cd1a4a98 | 741 | n = ALIGN(memslot->npages, BITS_PER_LONG) / 8; |
6aa8b732 | 742 | |
cd1a4a98 | 743 | for (i = 0; !any && i < n/sizeof(long); ++i) |
6aa8b732 AK |
744 | any = memslot->dirty_bitmap[i]; |
745 | ||
746 | r = -EFAULT; | |
747 | if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n)) | |
748 | goto out; | |
749 | ||
5bb064dc ZX |
750 | if (any) |
751 | *is_dirty = 1; | |
6aa8b732 AK |
752 | |
753 | r = 0; | |
6aa8b732 | 754 | out: |
6aa8b732 AK |
755 | return r; |
756 | } | |
757 | ||
54dee993 MT |
758 | void kvm_disable_largepages(void) |
759 | { | |
760 | largepages_enabled = false; | |
761 | } | |
762 | EXPORT_SYMBOL_GPL(kvm_disable_largepages); | |
763 | ||
cea7bb21 IE |
764 | int is_error_page(struct page *page) |
765 | { | |
766 | return page == bad_page; | |
767 | } | |
768 | EXPORT_SYMBOL_GPL(is_error_page); | |
769 | ||
35149e21 AL |
770 | int is_error_pfn(pfn_t pfn) |
771 | { | |
772 | return pfn == bad_pfn; | |
773 | } | |
774 | EXPORT_SYMBOL_GPL(is_error_pfn); | |
775 | ||
f9d46eb0 IE |
776 | static inline unsigned long bad_hva(void) |
777 | { | |
778 | return PAGE_OFFSET; | |
779 | } | |
780 | ||
781 | int kvm_is_error_hva(unsigned long addr) | |
782 | { | |
783 | return addr == bad_hva(); | |
784 | } | |
785 | EXPORT_SYMBOL_GPL(kvm_is_error_hva); | |
786 | ||
2843099f | 787 | struct kvm_memory_slot *gfn_to_memslot_unaliased(struct kvm *kvm, gfn_t gfn) |
6aa8b732 AK |
788 | { |
789 | int i; | |
46a26bf5 | 790 | struct kvm_memslots *slots = kvm->memslots; |
6aa8b732 | 791 | |
46a26bf5 MT |
792 | for (i = 0; i < slots->nmemslots; ++i) { |
793 | struct kvm_memory_slot *memslot = &slots->memslots[i]; | |
6aa8b732 AK |
794 | |
795 | if (gfn >= memslot->base_gfn | |
796 | && gfn < memslot->base_gfn + memslot->npages) | |
797 | return memslot; | |
798 | } | |
8b6d44c7 | 799 | return NULL; |
6aa8b732 | 800 | } |
2843099f | 801 | EXPORT_SYMBOL_GPL(gfn_to_memslot_unaliased); |
e8207547 AK |
802 | |
803 | struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn) | |
804 | { | |
805 | gfn = unalias_gfn(kvm, gfn); | |
2843099f | 806 | return gfn_to_memslot_unaliased(kvm, gfn); |
e8207547 | 807 | } |
6aa8b732 | 808 | |
e0d62c7f IE |
809 | int kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn) |
810 | { | |
811 | int i; | |
46a26bf5 | 812 | struct kvm_memslots *slots = kvm->memslots; |
e0d62c7f IE |
813 | |
814 | gfn = unalias_gfn(kvm, gfn); | |
815 | for (i = 0; i < KVM_MEMORY_SLOTS; ++i) { | |
46a26bf5 | 816 | struct kvm_memory_slot *memslot = &slots->memslots[i]; |
e0d62c7f IE |
817 | |
818 | if (gfn >= memslot->base_gfn | |
819 | && gfn < memslot->base_gfn + memslot->npages) | |
820 | return 1; | |
821 | } | |
822 | return 0; | |
823 | } | |
824 | EXPORT_SYMBOL_GPL(kvm_is_visible_gfn); | |
825 | ||
05da4558 | 826 | unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn) |
539cb660 IE |
827 | { |
828 | struct kvm_memory_slot *slot; | |
829 | ||
830 | gfn = unalias_gfn(kvm, gfn); | |
2843099f | 831 | slot = gfn_to_memslot_unaliased(kvm, gfn); |
539cb660 IE |
832 | if (!slot) |
833 | return bad_hva(); | |
834 | return (slot->userspace_addr + (gfn - slot->base_gfn) * PAGE_SIZE); | |
835 | } | |
0d150298 | 836 | EXPORT_SYMBOL_GPL(gfn_to_hva); |
539cb660 | 837 | |
35149e21 | 838 | pfn_t gfn_to_pfn(struct kvm *kvm, gfn_t gfn) |
954bbbc2 | 839 | { |
8d4e1288 | 840 | struct page *page[1]; |
539cb660 | 841 | unsigned long addr; |
8d4e1288 | 842 | int npages; |
2e2e3738 | 843 | pfn_t pfn; |
954bbbc2 | 844 | |
60395224 AK |
845 | might_sleep(); |
846 | ||
539cb660 IE |
847 | addr = gfn_to_hva(kvm, gfn); |
848 | if (kvm_is_error_hva(addr)) { | |
8a7ae055 | 849 | get_page(bad_page); |
35149e21 | 850 | return page_to_pfn(bad_page); |
8a7ae055 | 851 | } |
8d4e1288 | 852 | |
4c2155ce | 853 | npages = get_user_pages_fast(addr, 1, 1, page); |
539cb660 | 854 | |
2e2e3738 AL |
855 | if (unlikely(npages != 1)) { |
856 | struct vm_area_struct *vma; | |
857 | ||
4c2155ce | 858 | down_read(¤t->mm->mmap_sem); |
2e2e3738 | 859 | vma = find_vma(current->mm, addr); |
4c2155ce | 860 | |
2e2e3738 AL |
861 | if (vma == NULL || addr < vma->vm_start || |
862 | !(vma->vm_flags & VM_PFNMAP)) { | |
4c2155ce | 863 | up_read(¤t->mm->mmap_sem); |
2e2e3738 AL |
864 | get_page(bad_page); |
865 | return page_to_pfn(bad_page); | |
866 | } | |
867 | ||
868 | pfn = ((addr - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff; | |
4c2155ce | 869 | up_read(¤t->mm->mmap_sem); |
c77fb9dc | 870 | BUG_ON(!kvm_is_mmio_pfn(pfn)); |
2e2e3738 AL |
871 | } else |
872 | pfn = page_to_pfn(page[0]); | |
8d4e1288 | 873 | |
2e2e3738 | 874 | return pfn; |
35149e21 AL |
875 | } |
876 | ||
877 | EXPORT_SYMBOL_GPL(gfn_to_pfn); | |
878 | ||
879 | struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn) | |
880 | { | |
2e2e3738 AL |
881 | pfn_t pfn; |
882 | ||
883 | pfn = gfn_to_pfn(kvm, gfn); | |
c77fb9dc | 884 | if (!kvm_is_mmio_pfn(pfn)) |
2e2e3738 AL |
885 | return pfn_to_page(pfn); |
886 | ||
c77fb9dc | 887 | WARN_ON(kvm_is_mmio_pfn(pfn)); |
2e2e3738 AL |
888 | |
889 | get_page(bad_page); | |
890 | return bad_page; | |
954bbbc2 | 891 | } |
aab61cc0 | 892 | |
954bbbc2 AK |
893 | EXPORT_SYMBOL_GPL(gfn_to_page); |
894 | ||
b4231d61 IE |
895 | void kvm_release_page_clean(struct page *page) |
896 | { | |
35149e21 | 897 | kvm_release_pfn_clean(page_to_pfn(page)); |
b4231d61 IE |
898 | } |
899 | EXPORT_SYMBOL_GPL(kvm_release_page_clean); | |
900 | ||
35149e21 AL |
901 | void kvm_release_pfn_clean(pfn_t pfn) |
902 | { | |
c77fb9dc | 903 | if (!kvm_is_mmio_pfn(pfn)) |
2e2e3738 | 904 | put_page(pfn_to_page(pfn)); |
35149e21 AL |
905 | } |
906 | EXPORT_SYMBOL_GPL(kvm_release_pfn_clean); | |
907 | ||
b4231d61 | 908 | void kvm_release_page_dirty(struct page *page) |
8a7ae055 | 909 | { |
35149e21 AL |
910 | kvm_release_pfn_dirty(page_to_pfn(page)); |
911 | } | |
912 | EXPORT_SYMBOL_GPL(kvm_release_page_dirty); | |
913 | ||
914 | void kvm_release_pfn_dirty(pfn_t pfn) | |
915 | { | |
916 | kvm_set_pfn_dirty(pfn); | |
917 | kvm_release_pfn_clean(pfn); | |
918 | } | |
919 | EXPORT_SYMBOL_GPL(kvm_release_pfn_dirty); | |
920 | ||
921 | void kvm_set_page_dirty(struct page *page) | |
922 | { | |
923 | kvm_set_pfn_dirty(page_to_pfn(page)); | |
924 | } | |
925 | EXPORT_SYMBOL_GPL(kvm_set_page_dirty); | |
926 | ||
927 | void kvm_set_pfn_dirty(pfn_t pfn) | |
928 | { | |
c77fb9dc | 929 | if (!kvm_is_mmio_pfn(pfn)) { |
2e2e3738 AL |
930 | struct page *page = pfn_to_page(pfn); |
931 | if (!PageReserved(page)) | |
932 | SetPageDirty(page); | |
933 | } | |
8a7ae055 | 934 | } |
35149e21 AL |
935 | EXPORT_SYMBOL_GPL(kvm_set_pfn_dirty); |
936 | ||
937 | void kvm_set_pfn_accessed(pfn_t pfn) | |
938 | { | |
c77fb9dc | 939 | if (!kvm_is_mmio_pfn(pfn)) |
2e2e3738 | 940 | mark_page_accessed(pfn_to_page(pfn)); |
35149e21 AL |
941 | } |
942 | EXPORT_SYMBOL_GPL(kvm_set_pfn_accessed); | |
943 | ||
944 | void kvm_get_pfn(pfn_t pfn) | |
945 | { | |
c77fb9dc | 946 | if (!kvm_is_mmio_pfn(pfn)) |
2e2e3738 | 947 | get_page(pfn_to_page(pfn)); |
35149e21 AL |
948 | } |
949 | EXPORT_SYMBOL_GPL(kvm_get_pfn); | |
8a7ae055 | 950 | |
195aefde IE |
951 | static int next_segment(unsigned long len, int offset) |
952 | { | |
953 | if (len > PAGE_SIZE - offset) | |
954 | return PAGE_SIZE - offset; | |
955 | else | |
956 | return len; | |
957 | } | |
958 | ||
959 | int kvm_read_guest_page(struct kvm *kvm, gfn_t gfn, void *data, int offset, | |
960 | int len) | |
961 | { | |
e0506bcb IE |
962 | int r; |
963 | unsigned long addr; | |
195aefde | 964 | |
e0506bcb IE |
965 | addr = gfn_to_hva(kvm, gfn); |
966 | if (kvm_is_error_hva(addr)) | |
967 | return -EFAULT; | |
968 | r = copy_from_user(data, (void __user *)addr + offset, len); | |
969 | if (r) | |
195aefde | 970 | return -EFAULT; |
195aefde IE |
971 | return 0; |
972 | } | |
973 | EXPORT_SYMBOL_GPL(kvm_read_guest_page); | |
974 | ||
975 | int kvm_read_guest(struct kvm *kvm, gpa_t gpa, void *data, unsigned long len) | |
976 | { | |
977 | gfn_t gfn = gpa >> PAGE_SHIFT; | |
978 | int seg; | |
979 | int offset = offset_in_page(gpa); | |
980 | int ret; | |
981 | ||
982 | while ((seg = next_segment(len, offset)) != 0) { | |
983 | ret = kvm_read_guest_page(kvm, gfn, data, offset, seg); | |
984 | if (ret < 0) | |
985 | return ret; | |
986 | offset = 0; | |
987 | len -= seg; | |
988 | data += seg; | |
989 | ++gfn; | |
990 | } | |
991 | return 0; | |
992 | } | |
993 | EXPORT_SYMBOL_GPL(kvm_read_guest); | |
994 | ||
7ec54588 MT |
995 | int kvm_read_guest_atomic(struct kvm *kvm, gpa_t gpa, void *data, |
996 | unsigned long len) | |
997 | { | |
998 | int r; | |
999 | unsigned long addr; | |
1000 | gfn_t gfn = gpa >> PAGE_SHIFT; | |
1001 | int offset = offset_in_page(gpa); | |
1002 | ||
1003 | addr = gfn_to_hva(kvm, gfn); | |
1004 | if (kvm_is_error_hva(addr)) | |
1005 | return -EFAULT; | |
0aac03f0 | 1006 | pagefault_disable(); |
7ec54588 | 1007 | r = __copy_from_user_inatomic(data, (void __user *)addr + offset, len); |
0aac03f0 | 1008 | pagefault_enable(); |
7ec54588 MT |
1009 | if (r) |
1010 | return -EFAULT; | |
1011 | return 0; | |
1012 | } | |
1013 | EXPORT_SYMBOL(kvm_read_guest_atomic); | |
1014 | ||
195aefde IE |
1015 | int kvm_write_guest_page(struct kvm *kvm, gfn_t gfn, const void *data, |
1016 | int offset, int len) | |
1017 | { | |
e0506bcb IE |
1018 | int r; |
1019 | unsigned long addr; | |
195aefde | 1020 | |
e0506bcb IE |
1021 | addr = gfn_to_hva(kvm, gfn); |
1022 | if (kvm_is_error_hva(addr)) | |
1023 | return -EFAULT; | |
1024 | r = copy_to_user((void __user *)addr + offset, data, len); | |
1025 | if (r) | |
195aefde | 1026 | return -EFAULT; |
195aefde IE |
1027 | mark_page_dirty(kvm, gfn); |
1028 | return 0; | |
1029 | } | |
1030 | EXPORT_SYMBOL_GPL(kvm_write_guest_page); | |
1031 | ||
1032 | int kvm_write_guest(struct kvm *kvm, gpa_t gpa, const void *data, | |
1033 | unsigned long len) | |
1034 | { | |
1035 | gfn_t gfn = gpa >> PAGE_SHIFT; | |
1036 | int seg; | |
1037 | int offset = offset_in_page(gpa); | |
1038 | int ret; | |
1039 | ||
1040 | while ((seg = next_segment(len, offset)) != 0) { | |
1041 | ret = kvm_write_guest_page(kvm, gfn, data, offset, seg); | |
1042 | if (ret < 0) | |
1043 | return ret; | |
1044 | offset = 0; | |
1045 | len -= seg; | |
1046 | data += seg; | |
1047 | ++gfn; | |
1048 | } | |
1049 | return 0; | |
1050 | } | |
1051 | ||
1052 | int kvm_clear_guest_page(struct kvm *kvm, gfn_t gfn, int offset, int len) | |
1053 | { | |
3e021bf5 | 1054 | return kvm_write_guest_page(kvm, gfn, empty_zero_page, offset, len); |
195aefde IE |
1055 | } |
1056 | EXPORT_SYMBOL_GPL(kvm_clear_guest_page); | |
1057 | ||
1058 | int kvm_clear_guest(struct kvm *kvm, gpa_t gpa, unsigned long len) | |
1059 | { | |
1060 | gfn_t gfn = gpa >> PAGE_SHIFT; | |
1061 | int seg; | |
1062 | int offset = offset_in_page(gpa); | |
1063 | int ret; | |
1064 | ||
1065 | while ((seg = next_segment(len, offset)) != 0) { | |
1066 | ret = kvm_clear_guest_page(kvm, gfn, offset, seg); | |
1067 | if (ret < 0) | |
1068 | return ret; | |
1069 | offset = 0; | |
1070 | len -= seg; | |
1071 | ++gfn; | |
1072 | } | |
1073 | return 0; | |
1074 | } | |
1075 | EXPORT_SYMBOL_GPL(kvm_clear_guest); | |
1076 | ||
6aa8b732 AK |
1077 | void mark_page_dirty(struct kvm *kvm, gfn_t gfn) |
1078 | { | |
31389947 | 1079 | struct kvm_memory_slot *memslot; |
6aa8b732 | 1080 | |
3b6fff19 | 1081 | gfn = unalias_gfn(kvm, gfn); |
2843099f | 1082 | memslot = gfn_to_memslot_unaliased(kvm, gfn); |
7e9d619d RR |
1083 | if (memslot && memslot->dirty_bitmap) { |
1084 | unsigned long rel_gfn = gfn - memslot->base_gfn; | |
6aa8b732 | 1085 | |
7e9d619d | 1086 | /* avoid RMW */ |
c8240bd6 AG |
1087 | if (!generic_test_le_bit(rel_gfn, memslot->dirty_bitmap)) |
1088 | generic___set_le_bit(rel_gfn, memslot->dirty_bitmap); | |
6aa8b732 AK |
1089 | } |
1090 | } | |
1091 | ||
b6958ce4 ED |
1092 | /* |
1093 | * The vCPU has executed a HLT instruction with in-kernel mode enabled. | |
1094 | */ | |
8776e519 | 1095 | void kvm_vcpu_block(struct kvm_vcpu *vcpu) |
d3bef15f | 1096 | { |
e5c239cf MT |
1097 | DEFINE_WAIT(wait); |
1098 | ||
1099 | for (;;) { | |
1100 | prepare_to_wait(&vcpu->wq, &wait, TASK_INTERRUPTIBLE); | |
1101 | ||
a1b37100 | 1102 | if (kvm_arch_vcpu_runnable(vcpu)) { |
d7690175 | 1103 | set_bit(KVM_REQ_UNHALT, &vcpu->requests); |
e5c239cf | 1104 | break; |
d7690175 | 1105 | } |
09cec754 GN |
1106 | if (kvm_cpu_has_pending_timer(vcpu)) |
1107 | break; | |
e5c239cf MT |
1108 | if (signal_pending(current)) |
1109 | break; | |
1110 | ||
b6958ce4 | 1111 | schedule(); |
b6958ce4 | 1112 | } |
d3bef15f | 1113 | |
e5c239cf | 1114 | finish_wait(&vcpu->wq, &wait); |
b6958ce4 ED |
1115 | } |
1116 | ||
6aa8b732 AK |
1117 | void kvm_resched(struct kvm_vcpu *vcpu) |
1118 | { | |
3fca0365 YD |
1119 | if (!need_resched()) |
1120 | return; | |
6aa8b732 | 1121 | cond_resched(); |
6aa8b732 AK |
1122 | } |
1123 | EXPORT_SYMBOL_GPL(kvm_resched); | |
1124 | ||
d255f4f2 ZE |
1125 | void kvm_vcpu_on_spin(struct kvm_vcpu *vcpu) |
1126 | { | |
1127 | ktime_t expires; | |
1128 | DEFINE_WAIT(wait); | |
1129 | ||
1130 | prepare_to_wait(&vcpu->wq, &wait, TASK_INTERRUPTIBLE); | |
1131 | ||
1132 | /* Sleep for 100 us, and hope lock-holder got scheduled */ | |
1133 | expires = ktime_add_ns(ktime_get(), 100000UL); | |
1134 | schedule_hrtimeout(&expires, HRTIMER_MODE_ABS); | |
1135 | ||
1136 | finish_wait(&vcpu->wq, &wait); | |
1137 | } | |
1138 | EXPORT_SYMBOL_GPL(kvm_vcpu_on_spin); | |
1139 | ||
e4a533a4 | 1140 | static int kvm_vcpu_fault(struct vm_area_struct *vma, struct vm_fault *vmf) |
9a2bb7f4 AK |
1141 | { |
1142 | struct kvm_vcpu *vcpu = vma->vm_file->private_data; | |
9a2bb7f4 AK |
1143 | struct page *page; |
1144 | ||
e4a533a4 | 1145 | if (vmf->pgoff == 0) |
039576c0 | 1146 | page = virt_to_page(vcpu->run); |
09566765 | 1147 | #ifdef CONFIG_X86 |
e4a533a4 | 1148 | else if (vmf->pgoff == KVM_PIO_PAGE_OFFSET) |
ad312c7c | 1149 | page = virt_to_page(vcpu->arch.pio_data); |
5f94c174 LV |
1150 | #endif |
1151 | #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET | |
1152 | else if (vmf->pgoff == KVM_COALESCED_MMIO_PAGE_OFFSET) | |
1153 | page = virt_to_page(vcpu->kvm->coalesced_mmio_ring); | |
09566765 | 1154 | #endif |
039576c0 | 1155 | else |
e4a533a4 | 1156 | return VM_FAULT_SIGBUS; |
9a2bb7f4 | 1157 | get_page(page); |
e4a533a4 | 1158 | vmf->page = page; |
1159 | return 0; | |
9a2bb7f4 AK |
1160 | } |
1161 | ||
f0f37e2f | 1162 | static const struct vm_operations_struct kvm_vcpu_vm_ops = { |
e4a533a4 | 1163 | .fault = kvm_vcpu_fault, |
9a2bb7f4 AK |
1164 | }; |
1165 | ||
1166 | static int kvm_vcpu_mmap(struct file *file, struct vm_area_struct *vma) | |
1167 | { | |
1168 | vma->vm_ops = &kvm_vcpu_vm_ops; | |
1169 | return 0; | |
1170 | } | |
1171 | ||
bccf2150 AK |
1172 | static int kvm_vcpu_release(struct inode *inode, struct file *filp) |
1173 | { | |
1174 | struct kvm_vcpu *vcpu = filp->private_data; | |
1175 | ||
66c0b394 | 1176 | kvm_put_kvm(vcpu->kvm); |
bccf2150 AK |
1177 | return 0; |
1178 | } | |
1179 | ||
3d3aab1b | 1180 | static struct file_operations kvm_vcpu_fops = { |
bccf2150 AK |
1181 | .release = kvm_vcpu_release, |
1182 | .unlocked_ioctl = kvm_vcpu_ioctl, | |
1183 | .compat_ioctl = kvm_vcpu_ioctl, | |
9a2bb7f4 | 1184 | .mmap = kvm_vcpu_mmap, |
bccf2150 AK |
1185 | }; |
1186 | ||
1187 | /* | |
1188 | * Allocates an inode for the vcpu. | |
1189 | */ | |
1190 | static int create_vcpu_fd(struct kvm_vcpu *vcpu) | |
1191 | { | |
628ff7c1 | 1192 | return anon_inode_getfd("kvm-vcpu", &kvm_vcpu_fops, vcpu, O_RDWR); |
bccf2150 AK |
1193 | } |
1194 | ||
c5ea7660 AK |
1195 | /* |
1196 | * Creates some virtual cpus. Good luck creating more than one. | |
1197 | */ | |
73880c80 | 1198 | static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, u32 id) |
c5ea7660 AK |
1199 | { |
1200 | int r; | |
988a2cae | 1201 | struct kvm_vcpu *vcpu, *v; |
c5ea7660 | 1202 | |
73880c80 | 1203 | vcpu = kvm_arch_vcpu_create(kvm, id); |
fb3f0f51 RR |
1204 | if (IS_ERR(vcpu)) |
1205 | return PTR_ERR(vcpu); | |
c5ea7660 | 1206 | |
15ad7146 AK |
1207 | preempt_notifier_init(&vcpu->preempt_notifier, &kvm_preempt_ops); |
1208 | ||
26e5215f AK |
1209 | r = kvm_arch_vcpu_setup(vcpu); |
1210 | if (r) | |
7d8fece6 | 1211 | return r; |
26e5215f | 1212 | |
11ec2804 | 1213 | mutex_lock(&kvm->lock); |
73880c80 GN |
1214 | if (atomic_read(&kvm->online_vcpus) == KVM_MAX_VCPUS) { |
1215 | r = -EINVAL; | |
e9b11c17 | 1216 | goto vcpu_destroy; |
fb3f0f51 | 1217 | } |
73880c80 | 1218 | |
988a2cae GN |
1219 | kvm_for_each_vcpu(r, v, kvm) |
1220 | if (v->vcpu_id == id) { | |
73880c80 GN |
1221 | r = -EEXIST; |
1222 | goto vcpu_destroy; | |
1223 | } | |
1224 | ||
1225 | BUG_ON(kvm->vcpus[atomic_read(&kvm->online_vcpus)]); | |
c5ea7660 | 1226 | |
fb3f0f51 | 1227 | /* Now it's all set up, let userspace reach it */ |
66c0b394 | 1228 | kvm_get_kvm(kvm); |
bccf2150 | 1229 | r = create_vcpu_fd(vcpu); |
73880c80 GN |
1230 | if (r < 0) { |
1231 | kvm_put_kvm(kvm); | |
1232 | goto vcpu_destroy; | |
1233 | } | |
1234 | ||
1235 | kvm->vcpus[atomic_read(&kvm->online_vcpus)] = vcpu; | |
1236 | smp_wmb(); | |
1237 | atomic_inc(&kvm->online_vcpus); | |
1238 | ||
1239 | #ifdef CONFIG_KVM_APIC_ARCHITECTURE | |
1240 | if (kvm->bsp_vcpu_id == id) | |
1241 | kvm->bsp_vcpu = vcpu; | |
1242 | #endif | |
1243 | mutex_unlock(&kvm->lock); | |
fb3f0f51 | 1244 | return r; |
39c3b86e | 1245 | |
e9b11c17 | 1246 | vcpu_destroy: |
7d8fece6 | 1247 | mutex_unlock(&kvm->lock); |
d40ccc62 | 1248 | kvm_arch_vcpu_destroy(vcpu); |
c5ea7660 AK |
1249 | return r; |
1250 | } | |
1251 | ||
1961d276 AK |
1252 | static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu *vcpu, sigset_t *sigset) |
1253 | { | |
1254 | if (sigset) { | |
1255 | sigdelsetmask(sigset, sigmask(SIGKILL)|sigmask(SIGSTOP)); | |
1256 | vcpu->sigset_active = 1; | |
1257 | vcpu->sigset = *sigset; | |
1258 | } else | |
1259 | vcpu->sigset_active = 0; | |
1260 | return 0; | |
1261 | } | |
1262 | ||
bccf2150 AK |
1263 | static long kvm_vcpu_ioctl(struct file *filp, |
1264 | unsigned int ioctl, unsigned long arg) | |
6aa8b732 | 1265 | { |
bccf2150 | 1266 | struct kvm_vcpu *vcpu = filp->private_data; |
2f366987 | 1267 | void __user *argp = (void __user *)arg; |
313a3dc7 | 1268 | int r; |
fa3795a7 DH |
1269 | struct kvm_fpu *fpu = NULL; |
1270 | struct kvm_sregs *kvm_sregs = NULL; | |
6aa8b732 | 1271 | |
6d4e4c4f AK |
1272 | if (vcpu->kvm->mm != current->mm) |
1273 | return -EIO; | |
6aa8b732 | 1274 | switch (ioctl) { |
9a2bb7f4 | 1275 | case KVM_RUN: |
f0fe5108 AK |
1276 | r = -EINVAL; |
1277 | if (arg) | |
1278 | goto out; | |
b6c7a5dc | 1279 | r = kvm_arch_vcpu_ioctl_run(vcpu, vcpu->run); |
6aa8b732 | 1280 | break; |
6aa8b732 | 1281 | case KVM_GET_REGS: { |
3e4bb3ac | 1282 | struct kvm_regs *kvm_regs; |
6aa8b732 | 1283 | |
3e4bb3ac XZ |
1284 | r = -ENOMEM; |
1285 | kvm_regs = kzalloc(sizeof(struct kvm_regs), GFP_KERNEL); | |
1286 | if (!kvm_regs) | |
6aa8b732 | 1287 | goto out; |
3e4bb3ac XZ |
1288 | r = kvm_arch_vcpu_ioctl_get_regs(vcpu, kvm_regs); |
1289 | if (r) | |
1290 | goto out_free1; | |
6aa8b732 | 1291 | r = -EFAULT; |
3e4bb3ac XZ |
1292 | if (copy_to_user(argp, kvm_regs, sizeof(struct kvm_regs))) |
1293 | goto out_free1; | |
6aa8b732 | 1294 | r = 0; |
3e4bb3ac XZ |
1295 | out_free1: |
1296 | kfree(kvm_regs); | |
6aa8b732 AK |
1297 | break; |
1298 | } | |
1299 | case KVM_SET_REGS: { | |
3e4bb3ac | 1300 | struct kvm_regs *kvm_regs; |
6aa8b732 | 1301 | |
3e4bb3ac XZ |
1302 | r = -ENOMEM; |
1303 | kvm_regs = kzalloc(sizeof(struct kvm_regs), GFP_KERNEL); | |
1304 | if (!kvm_regs) | |
6aa8b732 | 1305 | goto out; |
3e4bb3ac XZ |
1306 | r = -EFAULT; |
1307 | if (copy_from_user(kvm_regs, argp, sizeof(struct kvm_regs))) | |
1308 | goto out_free2; | |
1309 | r = kvm_arch_vcpu_ioctl_set_regs(vcpu, kvm_regs); | |
6aa8b732 | 1310 | if (r) |
3e4bb3ac | 1311 | goto out_free2; |
6aa8b732 | 1312 | r = 0; |
3e4bb3ac XZ |
1313 | out_free2: |
1314 | kfree(kvm_regs); | |
6aa8b732 AK |
1315 | break; |
1316 | } | |
1317 | case KVM_GET_SREGS: { | |
fa3795a7 DH |
1318 | kvm_sregs = kzalloc(sizeof(struct kvm_sregs), GFP_KERNEL); |
1319 | r = -ENOMEM; | |
1320 | if (!kvm_sregs) | |
1321 | goto out; | |
1322 | r = kvm_arch_vcpu_ioctl_get_sregs(vcpu, kvm_sregs); | |
6aa8b732 AK |
1323 | if (r) |
1324 | goto out; | |
1325 | r = -EFAULT; | |
fa3795a7 | 1326 | if (copy_to_user(argp, kvm_sregs, sizeof(struct kvm_sregs))) |
6aa8b732 AK |
1327 | goto out; |
1328 | r = 0; | |
1329 | break; | |
1330 | } | |
1331 | case KVM_SET_SREGS: { | |
fa3795a7 DH |
1332 | kvm_sregs = kmalloc(sizeof(struct kvm_sregs), GFP_KERNEL); |
1333 | r = -ENOMEM; | |
1334 | if (!kvm_sregs) | |
1335 | goto out; | |
6aa8b732 | 1336 | r = -EFAULT; |
fa3795a7 | 1337 | if (copy_from_user(kvm_sregs, argp, sizeof(struct kvm_sregs))) |
6aa8b732 | 1338 | goto out; |
fa3795a7 | 1339 | r = kvm_arch_vcpu_ioctl_set_sregs(vcpu, kvm_sregs); |
6aa8b732 AK |
1340 | if (r) |
1341 | goto out; | |
1342 | r = 0; | |
1343 | break; | |
1344 | } | |
62d9f0db MT |
1345 | case KVM_GET_MP_STATE: { |
1346 | struct kvm_mp_state mp_state; | |
1347 | ||
1348 | r = kvm_arch_vcpu_ioctl_get_mpstate(vcpu, &mp_state); | |
1349 | if (r) | |
1350 | goto out; | |
1351 | r = -EFAULT; | |
1352 | if (copy_to_user(argp, &mp_state, sizeof mp_state)) | |
1353 | goto out; | |
1354 | r = 0; | |
1355 | break; | |
1356 | } | |
1357 | case KVM_SET_MP_STATE: { | |
1358 | struct kvm_mp_state mp_state; | |
1359 | ||
1360 | r = -EFAULT; | |
1361 | if (copy_from_user(&mp_state, argp, sizeof mp_state)) | |
1362 | goto out; | |
1363 | r = kvm_arch_vcpu_ioctl_set_mpstate(vcpu, &mp_state); | |
1364 | if (r) | |
1365 | goto out; | |
1366 | r = 0; | |
1367 | break; | |
1368 | } | |
6aa8b732 AK |
1369 | case KVM_TRANSLATE: { |
1370 | struct kvm_translation tr; | |
1371 | ||
1372 | r = -EFAULT; | |
2f366987 | 1373 | if (copy_from_user(&tr, argp, sizeof tr)) |
6aa8b732 | 1374 | goto out; |
8b006791 | 1375 | r = kvm_arch_vcpu_ioctl_translate(vcpu, &tr); |
6aa8b732 AK |
1376 | if (r) |
1377 | goto out; | |
1378 | r = -EFAULT; | |
2f366987 | 1379 | if (copy_to_user(argp, &tr, sizeof tr)) |
6aa8b732 AK |
1380 | goto out; |
1381 | r = 0; | |
1382 | break; | |
1383 | } | |
d0bfb940 JK |
1384 | case KVM_SET_GUEST_DEBUG: { |
1385 | struct kvm_guest_debug dbg; | |
6aa8b732 AK |
1386 | |
1387 | r = -EFAULT; | |
2f366987 | 1388 | if (copy_from_user(&dbg, argp, sizeof dbg)) |
6aa8b732 | 1389 | goto out; |
d0bfb940 | 1390 | r = kvm_arch_vcpu_ioctl_set_guest_debug(vcpu, &dbg); |
6aa8b732 AK |
1391 | if (r) |
1392 | goto out; | |
1393 | r = 0; | |
1394 | break; | |
1395 | } | |
1961d276 AK |
1396 | case KVM_SET_SIGNAL_MASK: { |
1397 | struct kvm_signal_mask __user *sigmask_arg = argp; | |
1398 | struct kvm_signal_mask kvm_sigmask; | |
1399 | sigset_t sigset, *p; | |
1400 | ||
1401 | p = NULL; | |
1402 | if (argp) { | |
1403 | r = -EFAULT; | |
1404 | if (copy_from_user(&kvm_sigmask, argp, | |
1405 | sizeof kvm_sigmask)) | |
1406 | goto out; | |
1407 | r = -EINVAL; | |
1408 | if (kvm_sigmask.len != sizeof sigset) | |
1409 | goto out; | |
1410 | r = -EFAULT; | |
1411 | if (copy_from_user(&sigset, sigmask_arg->sigset, | |
1412 | sizeof sigset)) | |
1413 | goto out; | |
1414 | p = &sigset; | |
1415 | } | |
1416 | r = kvm_vcpu_ioctl_set_sigmask(vcpu, &sigset); | |
1417 | break; | |
1418 | } | |
b8836737 | 1419 | case KVM_GET_FPU: { |
fa3795a7 DH |
1420 | fpu = kzalloc(sizeof(struct kvm_fpu), GFP_KERNEL); |
1421 | r = -ENOMEM; | |
1422 | if (!fpu) | |
1423 | goto out; | |
1424 | r = kvm_arch_vcpu_ioctl_get_fpu(vcpu, fpu); | |
b8836737 AK |
1425 | if (r) |
1426 | goto out; | |
1427 | r = -EFAULT; | |
fa3795a7 | 1428 | if (copy_to_user(argp, fpu, sizeof(struct kvm_fpu))) |
b8836737 AK |
1429 | goto out; |
1430 | r = 0; | |
1431 | break; | |
1432 | } | |
1433 | case KVM_SET_FPU: { | |
fa3795a7 DH |
1434 | fpu = kmalloc(sizeof(struct kvm_fpu), GFP_KERNEL); |
1435 | r = -ENOMEM; | |
1436 | if (!fpu) | |
1437 | goto out; | |
b8836737 | 1438 | r = -EFAULT; |
fa3795a7 | 1439 | if (copy_from_user(fpu, argp, sizeof(struct kvm_fpu))) |
b8836737 | 1440 | goto out; |
fa3795a7 | 1441 | r = kvm_arch_vcpu_ioctl_set_fpu(vcpu, fpu); |
b8836737 AK |
1442 | if (r) |
1443 | goto out; | |
1444 | r = 0; | |
1445 | break; | |
1446 | } | |
bccf2150 | 1447 | default: |
313a3dc7 | 1448 | r = kvm_arch_vcpu_ioctl(filp, ioctl, arg); |
bccf2150 AK |
1449 | } |
1450 | out: | |
fa3795a7 DH |
1451 | kfree(fpu); |
1452 | kfree(kvm_sregs); | |
bccf2150 AK |
1453 | return r; |
1454 | } | |
1455 | ||
1456 | static long kvm_vm_ioctl(struct file *filp, | |
1457 | unsigned int ioctl, unsigned long arg) | |
1458 | { | |
1459 | struct kvm *kvm = filp->private_data; | |
1460 | void __user *argp = (void __user *)arg; | |
1fe779f8 | 1461 | int r; |
bccf2150 | 1462 | |
6d4e4c4f AK |
1463 | if (kvm->mm != current->mm) |
1464 | return -EIO; | |
bccf2150 AK |
1465 | switch (ioctl) { |
1466 | case KVM_CREATE_VCPU: | |
1467 | r = kvm_vm_ioctl_create_vcpu(kvm, arg); | |
1468 | if (r < 0) | |
1469 | goto out; | |
1470 | break; | |
6fc138d2 IE |
1471 | case KVM_SET_USER_MEMORY_REGION: { |
1472 | struct kvm_userspace_memory_region kvm_userspace_mem; | |
1473 | ||
1474 | r = -EFAULT; | |
1475 | if (copy_from_user(&kvm_userspace_mem, argp, | |
1476 | sizeof kvm_userspace_mem)) | |
1477 | goto out; | |
1478 | ||
1479 | r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_userspace_mem, 1); | |
6aa8b732 AK |
1480 | if (r) |
1481 | goto out; | |
1482 | break; | |
1483 | } | |
1484 | case KVM_GET_DIRTY_LOG: { | |
1485 | struct kvm_dirty_log log; | |
1486 | ||
1487 | r = -EFAULT; | |
2f366987 | 1488 | if (copy_from_user(&log, argp, sizeof log)) |
6aa8b732 | 1489 | goto out; |
2c6f5df9 | 1490 | r = kvm_vm_ioctl_get_dirty_log(kvm, &log); |
6aa8b732 AK |
1491 | if (r) |
1492 | goto out; | |
1493 | break; | |
1494 | } | |
5f94c174 LV |
1495 | #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET |
1496 | case KVM_REGISTER_COALESCED_MMIO: { | |
1497 | struct kvm_coalesced_mmio_zone zone; | |
1498 | r = -EFAULT; | |
1499 | if (copy_from_user(&zone, argp, sizeof zone)) | |
1500 | goto out; | |
1501 | r = -ENXIO; | |
1502 | r = kvm_vm_ioctl_register_coalesced_mmio(kvm, &zone); | |
1503 | if (r) | |
1504 | goto out; | |
1505 | r = 0; | |
1506 | break; | |
1507 | } | |
1508 | case KVM_UNREGISTER_COALESCED_MMIO: { | |
1509 | struct kvm_coalesced_mmio_zone zone; | |
1510 | r = -EFAULT; | |
1511 | if (copy_from_user(&zone, argp, sizeof zone)) | |
1512 | goto out; | |
1513 | r = -ENXIO; | |
1514 | r = kvm_vm_ioctl_unregister_coalesced_mmio(kvm, &zone); | |
1515 | if (r) | |
1516 | goto out; | |
1517 | r = 0; | |
1518 | break; | |
1519 | } | |
1520 | #endif | |
721eecbf GH |
1521 | case KVM_IRQFD: { |
1522 | struct kvm_irqfd data; | |
1523 | ||
1524 | r = -EFAULT; | |
1525 | if (copy_from_user(&data, argp, sizeof data)) | |
1526 | goto out; | |
1527 | r = kvm_irqfd(kvm, data.fd, data.gsi, data.flags); | |
1528 | break; | |
1529 | } | |
d34e6b17 GH |
1530 | case KVM_IOEVENTFD: { |
1531 | struct kvm_ioeventfd data; | |
1532 | ||
1533 | r = -EFAULT; | |
1534 | if (copy_from_user(&data, argp, sizeof data)) | |
1535 | goto out; | |
1536 | r = kvm_ioeventfd(kvm, &data); | |
1537 | break; | |
1538 | } | |
73880c80 GN |
1539 | #ifdef CONFIG_KVM_APIC_ARCHITECTURE |
1540 | case KVM_SET_BOOT_CPU_ID: | |
1541 | r = 0; | |
894a9c55 | 1542 | mutex_lock(&kvm->lock); |
73880c80 GN |
1543 | if (atomic_read(&kvm->online_vcpus) != 0) |
1544 | r = -EBUSY; | |
1545 | else | |
1546 | kvm->bsp_vcpu_id = arg; | |
894a9c55 | 1547 | mutex_unlock(&kvm->lock); |
73880c80 GN |
1548 | break; |
1549 | #endif | |
f17abe9a | 1550 | default: |
1fe779f8 | 1551 | r = kvm_arch_vm_ioctl(filp, ioctl, arg); |
bfd99ff5 AK |
1552 | if (r == -ENOTTY) |
1553 | r = kvm_vm_ioctl_assigned_device(kvm, ioctl, arg); | |
f17abe9a AK |
1554 | } |
1555 | out: | |
1556 | return r; | |
1557 | } | |
1558 | ||
6ff5894c AB |
1559 | #ifdef CONFIG_COMPAT |
1560 | struct compat_kvm_dirty_log { | |
1561 | __u32 slot; | |
1562 | __u32 padding1; | |
1563 | union { | |
1564 | compat_uptr_t dirty_bitmap; /* one bit per page */ | |
1565 | __u64 padding2; | |
1566 | }; | |
1567 | }; | |
1568 | ||
1569 | static long kvm_vm_compat_ioctl(struct file *filp, | |
1570 | unsigned int ioctl, unsigned long arg) | |
1571 | { | |
1572 | struct kvm *kvm = filp->private_data; | |
1573 | int r; | |
1574 | ||
1575 | if (kvm->mm != current->mm) | |
1576 | return -EIO; | |
1577 | switch (ioctl) { | |
1578 | case KVM_GET_DIRTY_LOG: { | |
1579 | struct compat_kvm_dirty_log compat_log; | |
1580 | struct kvm_dirty_log log; | |
1581 | ||
1582 | r = -EFAULT; | |
1583 | if (copy_from_user(&compat_log, (void __user *)arg, | |
1584 | sizeof(compat_log))) | |
1585 | goto out; | |
1586 | log.slot = compat_log.slot; | |
1587 | log.padding1 = compat_log.padding1; | |
1588 | log.padding2 = compat_log.padding2; | |
1589 | log.dirty_bitmap = compat_ptr(compat_log.dirty_bitmap); | |
1590 | ||
1591 | r = kvm_vm_ioctl_get_dirty_log(kvm, &log); | |
1592 | if (r) | |
1593 | goto out; | |
1594 | break; | |
1595 | } | |
1596 | default: | |
1597 | r = kvm_vm_ioctl(filp, ioctl, arg); | |
1598 | } | |
1599 | ||
1600 | out: | |
1601 | return r; | |
1602 | } | |
1603 | #endif | |
1604 | ||
e4a533a4 | 1605 | static int kvm_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf) |
f17abe9a | 1606 | { |
777b3f49 MT |
1607 | struct page *page[1]; |
1608 | unsigned long addr; | |
1609 | int npages; | |
1610 | gfn_t gfn = vmf->pgoff; | |
f17abe9a | 1611 | struct kvm *kvm = vma->vm_file->private_data; |
f17abe9a | 1612 | |
777b3f49 MT |
1613 | addr = gfn_to_hva(kvm, gfn); |
1614 | if (kvm_is_error_hva(addr)) | |
e4a533a4 | 1615 | return VM_FAULT_SIGBUS; |
777b3f49 MT |
1616 | |
1617 | npages = get_user_pages(current, current->mm, addr, 1, 1, 0, page, | |
1618 | NULL); | |
1619 | if (unlikely(npages != 1)) | |
e4a533a4 | 1620 | return VM_FAULT_SIGBUS; |
777b3f49 MT |
1621 | |
1622 | vmf->page = page[0]; | |
e4a533a4 | 1623 | return 0; |
f17abe9a AK |
1624 | } |
1625 | ||
f0f37e2f | 1626 | static const struct vm_operations_struct kvm_vm_vm_ops = { |
e4a533a4 | 1627 | .fault = kvm_vm_fault, |
f17abe9a AK |
1628 | }; |
1629 | ||
1630 | static int kvm_vm_mmap(struct file *file, struct vm_area_struct *vma) | |
1631 | { | |
1632 | vma->vm_ops = &kvm_vm_vm_ops; | |
1633 | return 0; | |
1634 | } | |
1635 | ||
3d3aab1b | 1636 | static struct file_operations kvm_vm_fops = { |
f17abe9a AK |
1637 | .release = kvm_vm_release, |
1638 | .unlocked_ioctl = kvm_vm_ioctl, | |
6ff5894c AB |
1639 | #ifdef CONFIG_COMPAT |
1640 | .compat_ioctl = kvm_vm_compat_ioctl, | |
1641 | #endif | |
f17abe9a AK |
1642 | .mmap = kvm_vm_mmap, |
1643 | }; | |
1644 | ||
1645 | static int kvm_dev_ioctl_create_vm(void) | |
1646 | { | |
2030a42c | 1647 | int fd; |
f17abe9a AK |
1648 | struct kvm *kvm; |
1649 | ||
f17abe9a | 1650 | kvm = kvm_create_vm(); |
d6d28168 AK |
1651 | if (IS_ERR(kvm)) |
1652 | return PTR_ERR(kvm); | |
628ff7c1 | 1653 | fd = anon_inode_getfd("kvm-vm", &kvm_vm_fops, kvm, O_RDWR); |
2030a42c | 1654 | if (fd < 0) |
66c0b394 | 1655 | kvm_put_kvm(kvm); |
f17abe9a | 1656 | |
f17abe9a | 1657 | return fd; |
f17abe9a AK |
1658 | } |
1659 | ||
1a811b61 AK |
1660 | static long kvm_dev_ioctl_check_extension_generic(long arg) |
1661 | { | |
1662 | switch (arg) { | |
ca9edaee | 1663 | case KVM_CAP_USER_MEMORY: |
1a811b61 | 1664 | case KVM_CAP_DESTROY_MEMORY_REGION_WORKS: |
4cd481f6 | 1665 | case KVM_CAP_JOIN_MEMORY_REGIONS_WORKS: |
73880c80 GN |
1666 | #ifdef CONFIG_KVM_APIC_ARCHITECTURE |
1667 | case KVM_CAP_SET_BOOT_CPU_ID: | |
1668 | #endif | |
a9c7399d | 1669 | case KVM_CAP_INTERNAL_ERROR_DATA: |
1a811b61 | 1670 | return 1; |
399ec807 AK |
1671 | #ifdef CONFIG_HAVE_KVM_IRQCHIP |
1672 | case KVM_CAP_IRQ_ROUTING: | |
36463146 | 1673 | return KVM_MAX_IRQ_ROUTES; |
399ec807 | 1674 | #endif |
1a811b61 AK |
1675 | default: |
1676 | break; | |
1677 | } | |
1678 | return kvm_dev_ioctl_check_extension(arg); | |
1679 | } | |
1680 | ||
f17abe9a AK |
1681 | static long kvm_dev_ioctl(struct file *filp, |
1682 | unsigned int ioctl, unsigned long arg) | |
1683 | { | |
07c45a36 | 1684 | long r = -EINVAL; |
f17abe9a AK |
1685 | |
1686 | switch (ioctl) { | |
1687 | case KVM_GET_API_VERSION: | |
f0fe5108 AK |
1688 | r = -EINVAL; |
1689 | if (arg) | |
1690 | goto out; | |
f17abe9a AK |
1691 | r = KVM_API_VERSION; |
1692 | break; | |
1693 | case KVM_CREATE_VM: | |
f0fe5108 AK |
1694 | r = -EINVAL; |
1695 | if (arg) | |
1696 | goto out; | |
f17abe9a AK |
1697 | r = kvm_dev_ioctl_create_vm(); |
1698 | break; | |
018d00d2 | 1699 | case KVM_CHECK_EXTENSION: |
1a811b61 | 1700 | r = kvm_dev_ioctl_check_extension_generic(arg); |
5d308f45 | 1701 | break; |
07c45a36 AK |
1702 | case KVM_GET_VCPU_MMAP_SIZE: |
1703 | r = -EINVAL; | |
1704 | if (arg) | |
1705 | goto out; | |
adb1ff46 AK |
1706 | r = PAGE_SIZE; /* struct kvm_run */ |
1707 | #ifdef CONFIG_X86 | |
1708 | r += PAGE_SIZE; /* pio data page */ | |
5f94c174 LV |
1709 | #endif |
1710 | #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET | |
1711 | r += PAGE_SIZE; /* coalesced mmio ring page */ | |
adb1ff46 | 1712 | #endif |
07c45a36 | 1713 | break; |
d4c9ff2d FEL |
1714 | case KVM_TRACE_ENABLE: |
1715 | case KVM_TRACE_PAUSE: | |
1716 | case KVM_TRACE_DISABLE: | |
2023a29c | 1717 | r = -EOPNOTSUPP; |
d4c9ff2d | 1718 | break; |
6aa8b732 | 1719 | default: |
043405e1 | 1720 | return kvm_arch_dev_ioctl(filp, ioctl, arg); |
6aa8b732 AK |
1721 | } |
1722 | out: | |
1723 | return r; | |
1724 | } | |
1725 | ||
6aa8b732 | 1726 | static struct file_operations kvm_chardev_ops = { |
6aa8b732 AK |
1727 | .unlocked_ioctl = kvm_dev_ioctl, |
1728 | .compat_ioctl = kvm_dev_ioctl, | |
6aa8b732 AK |
1729 | }; |
1730 | ||
1731 | static struct miscdevice kvm_dev = { | |
bbe4432e | 1732 | KVM_MINOR, |
6aa8b732 AK |
1733 | "kvm", |
1734 | &kvm_chardev_ops, | |
1735 | }; | |
1736 | ||
1b6c0168 AK |
1737 | static void hardware_enable(void *junk) |
1738 | { | |
1739 | int cpu = raw_smp_processor_id(); | |
10474ae8 | 1740 | int r; |
1b6c0168 | 1741 | |
7f59f492 | 1742 | if (cpumask_test_cpu(cpu, cpus_hardware_enabled)) |
1b6c0168 | 1743 | return; |
10474ae8 | 1744 | |
7f59f492 | 1745 | cpumask_set_cpu(cpu, cpus_hardware_enabled); |
10474ae8 AG |
1746 | |
1747 | r = kvm_arch_hardware_enable(NULL); | |
1748 | ||
1749 | if (r) { | |
1750 | cpumask_clear_cpu(cpu, cpus_hardware_enabled); | |
1751 | atomic_inc(&hardware_enable_failed); | |
1752 | printk(KERN_INFO "kvm: enabling virtualization on " | |
1753 | "CPU%d failed\n", cpu); | |
1754 | } | |
1b6c0168 AK |
1755 | } |
1756 | ||
1757 | static void hardware_disable(void *junk) | |
1758 | { | |
1759 | int cpu = raw_smp_processor_id(); | |
1760 | ||
7f59f492 | 1761 | if (!cpumask_test_cpu(cpu, cpus_hardware_enabled)) |
1b6c0168 | 1762 | return; |
7f59f492 | 1763 | cpumask_clear_cpu(cpu, cpus_hardware_enabled); |
e9b11c17 | 1764 | kvm_arch_hardware_disable(NULL); |
1b6c0168 AK |
1765 | } |
1766 | ||
10474ae8 AG |
1767 | static void hardware_disable_all_nolock(void) |
1768 | { | |
1769 | BUG_ON(!kvm_usage_count); | |
1770 | ||
1771 | kvm_usage_count--; | |
1772 | if (!kvm_usage_count) | |
1773 | on_each_cpu(hardware_disable, NULL, 1); | |
1774 | } | |
1775 | ||
1776 | static void hardware_disable_all(void) | |
1777 | { | |
1778 | spin_lock(&kvm_lock); | |
1779 | hardware_disable_all_nolock(); | |
1780 | spin_unlock(&kvm_lock); | |
1781 | } | |
1782 | ||
1783 | static int hardware_enable_all(void) | |
1784 | { | |
1785 | int r = 0; | |
1786 | ||
1787 | spin_lock(&kvm_lock); | |
1788 | ||
1789 | kvm_usage_count++; | |
1790 | if (kvm_usage_count == 1) { | |
1791 | atomic_set(&hardware_enable_failed, 0); | |
1792 | on_each_cpu(hardware_enable, NULL, 1); | |
1793 | ||
1794 | if (atomic_read(&hardware_enable_failed)) { | |
1795 | hardware_disable_all_nolock(); | |
1796 | r = -EBUSY; | |
1797 | } | |
1798 | } | |
1799 | ||
1800 | spin_unlock(&kvm_lock); | |
1801 | ||
1802 | return r; | |
1803 | } | |
1804 | ||
774c47f1 AK |
1805 | static int kvm_cpu_hotplug(struct notifier_block *notifier, unsigned long val, |
1806 | void *v) | |
1807 | { | |
1808 | int cpu = (long)v; | |
1809 | ||
10474ae8 AG |
1810 | if (!kvm_usage_count) |
1811 | return NOTIFY_OK; | |
1812 | ||
1a6f4d7f | 1813 | val &= ~CPU_TASKS_FROZEN; |
774c47f1 | 1814 | switch (val) { |
cec9ad27 | 1815 | case CPU_DYING: |
6ec8a856 AK |
1816 | printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n", |
1817 | cpu); | |
1818 | hardware_disable(NULL); | |
1819 | break; | |
774c47f1 | 1820 | case CPU_UP_CANCELED: |
43934a38 JK |
1821 | printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n", |
1822 | cpu); | |
8691e5a8 | 1823 | smp_call_function_single(cpu, hardware_disable, NULL, 1); |
774c47f1 | 1824 | break; |
43934a38 JK |
1825 | case CPU_ONLINE: |
1826 | printk(KERN_INFO "kvm: enabling virtualization on CPU%d\n", | |
1827 | cpu); | |
8691e5a8 | 1828 | smp_call_function_single(cpu, hardware_enable, NULL, 1); |
774c47f1 AK |
1829 | break; |
1830 | } | |
1831 | return NOTIFY_OK; | |
1832 | } | |
1833 | ||
4ecac3fd AK |
1834 | |
1835 | asmlinkage void kvm_handle_fault_on_reboot(void) | |
1836 | { | |
1837 | if (kvm_rebooting) | |
1838 | /* spin while reset goes on */ | |
1839 | while (true) | |
1840 | ; | |
1841 | /* Fault while not rebooting. We want the trace. */ | |
1842 | BUG(); | |
1843 | } | |
1844 | EXPORT_SYMBOL_GPL(kvm_handle_fault_on_reboot); | |
1845 | ||
9a2b85c6 | 1846 | static int kvm_reboot(struct notifier_block *notifier, unsigned long val, |
d77c26fc | 1847 | void *v) |
9a2b85c6 | 1848 | { |
8e1c1815 SY |
1849 | /* |
1850 | * Some (well, at least mine) BIOSes hang on reboot if | |
1851 | * in vmx root mode. | |
1852 | * | |
1853 | * And Intel TXT required VMX off for all cpu when system shutdown. | |
1854 | */ | |
1855 | printk(KERN_INFO "kvm: exiting hardware virtualization\n"); | |
1856 | kvm_rebooting = true; | |
1857 | on_each_cpu(hardware_disable, NULL, 1); | |
9a2b85c6 RR |
1858 | return NOTIFY_OK; |
1859 | } | |
1860 | ||
1861 | static struct notifier_block kvm_reboot_notifier = { | |
1862 | .notifier_call = kvm_reboot, | |
1863 | .priority = 0, | |
1864 | }; | |
1865 | ||
2eeb2e94 GH |
1866 | void kvm_io_bus_init(struct kvm_io_bus *bus) |
1867 | { | |
1868 | memset(bus, 0, sizeof(*bus)); | |
1869 | } | |
1870 | ||
1871 | void kvm_io_bus_destroy(struct kvm_io_bus *bus) | |
1872 | { | |
1873 | int i; | |
1874 | ||
1875 | for (i = 0; i < bus->dev_count; i++) { | |
1876 | struct kvm_io_device *pos = bus->devs[i]; | |
1877 | ||
1878 | kvm_iodevice_destructor(pos); | |
1879 | } | |
1880 | } | |
1881 | ||
bda9020e MT |
1882 | /* kvm_io_bus_write - called under kvm->slots_lock */ |
1883 | int kvm_io_bus_write(struct kvm_io_bus *bus, gpa_t addr, | |
1884 | int len, const void *val) | |
2eeb2e94 GH |
1885 | { |
1886 | int i; | |
bda9020e MT |
1887 | for (i = 0; i < bus->dev_count; i++) |
1888 | if (!kvm_iodevice_write(bus->devs[i], addr, len, val)) | |
1889 | return 0; | |
1890 | return -EOPNOTSUPP; | |
1891 | } | |
2eeb2e94 | 1892 | |
bda9020e MT |
1893 | /* kvm_io_bus_read - called under kvm->slots_lock */ |
1894 | int kvm_io_bus_read(struct kvm_io_bus *bus, gpa_t addr, int len, void *val) | |
1895 | { | |
1896 | int i; | |
1897 | for (i = 0; i < bus->dev_count; i++) | |
1898 | if (!kvm_iodevice_read(bus->devs[i], addr, len, val)) | |
1899 | return 0; | |
1900 | return -EOPNOTSUPP; | |
2eeb2e94 GH |
1901 | } |
1902 | ||
090b7aff | 1903 | int kvm_io_bus_register_dev(struct kvm *kvm, struct kvm_io_bus *bus, |
6c474694 MT |
1904 | struct kvm_io_device *dev) |
1905 | { | |
090b7aff GH |
1906 | int ret; |
1907 | ||
6c474694 | 1908 | down_write(&kvm->slots_lock); |
090b7aff | 1909 | ret = __kvm_io_bus_register_dev(bus, dev); |
6c474694 | 1910 | up_write(&kvm->slots_lock); |
090b7aff GH |
1911 | |
1912 | return ret; | |
6c474694 MT |
1913 | } |
1914 | ||
1915 | /* An unlocked version. Caller must have write lock on slots_lock. */ | |
090b7aff GH |
1916 | int __kvm_io_bus_register_dev(struct kvm_io_bus *bus, |
1917 | struct kvm_io_device *dev) | |
2eeb2e94 | 1918 | { |
090b7aff GH |
1919 | if (bus->dev_count > NR_IOBUS_DEVS-1) |
1920 | return -ENOSPC; | |
2eeb2e94 GH |
1921 | |
1922 | bus->devs[bus->dev_count++] = dev; | |
090b7aff GH |
1923 | |
1924 | return 0; | |
1925 | } | |
1926 | ||
1927 | void kvm_io_bus_unregister_dev(struct kvm *kvm, | |
1928 | struct kvm_io_bus *bus, | |
1929 | struct kvm_io_device *dev) | |
1930 | { | |
1931 | down_write(&kvm->slots_lock); | |
1932 | __kvm_io_bus_unregister_dev(bus, dev); | |
1933 | up_write(&kvm->slots_lock); | |
1934 | } | |
1935 | ||
1936 | /* An unlocked version. Caller must have write lock on slots_lock. */ | |
1937 | void __kvm_io_bus_unregister_dev(struct kvm_io_bus *bus, | |
1938 | struct kvm_io_device *dev) | |
1939 | { | |
1940 | int i; | |
1941 | ||
1942 | for (i = 0; i < bus->dev_count; i++) | |
1943 | if (bus->devs[i] == dev) { | |
1944 | bus->devs[i] = bus->devs[--bus->dev_count]; | |
1945 | break; | |
1946 | } | |
2eeb2e94 GH |
1947 | } |
1948 | ||
774c47f1 AK |
1949 | static struct notifier_block kvm_cpu_notifier = { |
1950 | .notifier_call = kvm_cpu_hotplug, | |
1951 | .priority = 20, /* must be > scheduler priority */ | |
1952 | }; | |
1953 | ||
8b88b099 | 1954 | static int vm_stat_get(void *_offset, u64 *val) |
ba1389b7 AK |
1955 | { |
1956 | unsigned offset = (long)_offset; | |
ba1389b7 AK |
1957 | struct kvm *kvm; |
1958 | ||
8b88b099 | 1959 | *val = 0; |
ba1389b7 AK |
1960 | spin_lock(&kvm_lock); |
1961 | list_for_each_entry(kvm, &vm_list, vm_list) | |
8b88b099 | 1962 | *val += *(u32 *)((void *)kvm + offset); |
ba1389b7 | 1963 | spin_unlock(&kvm_lock); |
8b88b099 | 1964 | return 0; |
ba1389b7 AK |
1965 | } |
1966 | ||
1967 | DEFINE_SIMPLE_ATTRIBUTE(vm_stat_fops, vm_stat_get, NULL, "%llu\n"); | |
1968 | ||
8b88b099 | 1969 | static int vcpu_stat_get(void *_offset, u64 *val) |
1165f5fe AK |
1970 | { |
1971 | unsigned offset = (long)_offset; | |
1165f5fe AK |
1972 | struct kvm *kvm; |
1973 | struct kvm_vcpu *vcpu; | |
1974 | int i; | |
1975 | ||
8b88b099 | 1976 | *val = 0; |
1165f5fe AK |
1977 | spin_lock(&kvm_lock); |
1978 | list_for_each_entry(kvm, &vm_list, vm_list) | |
988a2cae GN |
1979 | kvm_for_each_vcpu(i, vcpu, kvm) |
1980 | *val += *(u32 *)((void *)vcpu + offset); | |
1981 | ||
1165f5fe | 1982 | spin_unlock(&kvm_lock); |
8b88b099 | 1983 | return 0; |
1165f5fe AK |
1984 | } |
1985 | ||
ba1389b7 AK |
1986 | DEFINE_SIMPLE_ATTRIBUTE(vcpu_stat_fops, vcpu_stat_get, NULL, "%llu\n"); |
1987 | ||
828c0950 | 1988 | static const struct file_operations *stat_fops[] = { |
ba1389b7 AK |
1989 | [KVM_STAT_VCPU] = &vcpu_stat_fops, |
1990 | [KVM_STAT_VM] = &vm_stat_fops, | |
1991 | }; | |
1165f5fe | 1992 | |
a16b043c | 1993 | static void kvm_init_debug(void) |
6aa8b732 AK |
1994 | { |
1995 | struct kvm_stats_debugfs_item *p; | |
1996 | ||
76f7c879 | 1997 | kvm_debugfs_dir = debugfs_create_dir("kvm", NULL); |
6aa8b732 | 1998 | for (p = debugfs_entries; p->name; ++p) |
76f7c879 | 1999 | p->dentry = debugfs_create_file(p->name, 0444, kvm_debugfs_dir, |
1165f5fe | 2000 | (void *)(long)p->offset, |
ba1389b7 | 2001 | stat_fops[p->kind]); |
6aa8b732 AK |
2002 | } |
2003 | ||
2004 | static void kvm_exit_debug(void) | |
2005 | { | |
2006 | struct kvm_stats_debugfs_item *p; | |
2007 | ||
2008 | for (p = debugfs_entries; p->name; ++p) | |
2009 | debugfs_remove(p->dentry); | |
76f7c879 | 2010 | debugfs_remove(kvm_debugfs_dir); |
6aa8b732 AK |
2011 | } |
2012 | ||
59ae6c6b AK |
2013 | static int kvm_suspend(struct sys_device *dev, pm_message_t state) |
2014 | { | |
10474ae8 AG |
2015 | if (kvm_usage_count) |
2016 | hardware_disable(NULL); | |
59ae6c6b AK |
2017 | return 0; |
2018 | } | |
2019 | ||
2020 | static int kvm_resume(struct sys_device *dev) | |
2021 | { | |
10474ae8 AG |
2022 | if (kvm_usage_count) |
2023 | hardware_enable(NULL); | |
59ae6c6b AK |
2024 | return 0; |
2025 | } | |
2026 | ||
2027 | static struct sysdev_class kvm_sysdev_class = { | |
af5ca3f4 | 2028 | .name = "kvm", |
59ae6c6b AK |
2029 | .suspend = kvm_suspend, |
2030 | .resume = kvm_resume, | |
2031 | }; | |
2032 | ||
2033 | static struct sys_device kvm_sysdev = { | |
2034 | .id = 0, | |
2035 | .cls = &kvm_sysdev_class, | |
2036 | }; | |
2037 | ||
cea7bb21 | 2038 | struct page *bad_page; |
35149e21 | 2039 | pfn_t bad_pfn; |
6aa8b732 | 2040 | |
15ad7146 AK |
2041 | static inline |
2042 | struct kvm_vcpu *preempt_notifier_to_vcpu(struct preempt_notifier *pn) | |
2043 | { | |
2044 | return container_of(pn, struct kvm_vcpu, preempt_notifier); | |
2045 | } | |
2046 | ||
2047 | static void kvm_sched_in(struct preempt_notifier *pn, int cpu) | |
2048 | { | |
2049 | struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn); | |
2050 | ||
e9b11c17 | 2051 | kvm_arch_vcpu_load(vcpu, cpu); |
15ad7146 AK |
2052 | } |
2053 | ||
2054 | static void kvm_sched_out(struct preempt_notifier *pn, | |
2055 | struct task_struct *next) | |
2056 | { | |
2057 | struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn); | |
2058 | ||
e9b11c17 | 2059 | kvm_arch_vcpu_put(vcpu); |
15ad7146 AK |
2060 | } |
2061 | ||
f8c16bba | 2062 | int kvm_init(void *opaque, unsigned int vcpu_size, |
c16f862d | 2063 | struct module *module) |
6aa8b732 AK |
2064 | { |
2065 | int r; | |
002c7f7c | 2066 | int cpu; |
6aa8b732 | 2067 | |
f8c16bba ZX |
2068 | r = kvm_arch_init(opaque); |
2069 | if (r) | |
d2308784 | 2070 | goto out_fail; |
cb498ea2 ZX |
2071 | |
2072 | bad_page = alloc_page(GFP_KERNEL | __GFP_ZERO); | |
2073 | ||
2074 | if (bad_page == NULL) { | |
2075 | r = -ENOMEM; | |
2076 | goto out; | |
2077 | } | |
2078 | ||
35149e21 AL |
2079 | bad_pfn = page_to_pfn(bad_page); |
2080 | ||
8437a617 | 2081 | if (!zalloc_cpumask_var(&cpus_hardware_enabled, GFP_KERNEL)) { |
7f59f492 RR |
2082 | r = -ENOMEM; |
2083 | goto out_free_0; | |
2084 | } | |
2085 | ||
e9b11c17 | 2086 | r = kvm_arch_hardware_setup(); |
6aa8b732 | 2087 | if (r < 0) |
7f59f492 | 2088 | goto out_free_0a; |
6aa8b732 | 2089 | |
002c7f7c YS |
2090 | for_each_online_cpu(cpu) { |
2091 | smp_call_function_single(cpu, | |
e9b11c17 | 2092 | kvm_arch_check_processor_compat, |
8691e5a8 | 2093 | &r, 1); |
002c7f7c | 2094 | if (r < 0) |
d2308784 | 2095 | goto out_free_1; |
002c7f7c YS |
2096 | } |
2097 | ||
774c47f1 AK |
2098 | r = register_cpu_notifier(&kvm_cpu_notifier); |
2099 | if (r) | |
d2308784 | 2100 | goto out_free_2; |
6aa8b732 AK |
2101 | register_reboot_notifier(&kvm_reboot_notifier); |
2102 | ||
59ae6c6b AK |
2103 | r = sysdev_class_register(&kvm_sysdev_class); |
2104 | if (r) | |
d2308784 | 2105 | goto out_free_3; |
59ae6c6b AK |
2106 | |
2107 | r = sysdev_register(&kvm_sysdev); | |
2108 | if (r) | |
d2308784 | 2109 | goto out_free_4; |
59ae6c6b | 2110 | |
c16f862d RR |
2111 | /* A kmem cache lets us meet the alignment requirements of fx_save. */ |
2112 | kvm_vcpu_cache = kmem_cache_create("kvm_vcpu", vcpu_size, | |
56919c5c JP |
2113 | __alignof__(struct kvm_vcpu), |
2114 | 0, NULL); | |
c16f862d RR |
2115 | if (!kvm_vcpu_cache) { |
2116 | r = -ENOMEM; | |
d2308784 | 2117 | goto out_free_5; |
c16f862d RR |
2118 | } |
2119 | ||
6aa8b732 | 2120 | kvm_chardev_ops.owner = module; |
3d3aab1b CB |
2121 | kvm_vm_fops.owner = module; |
2122 | kvm_vcpu_fops.owner = module; | |
6aa8b732 AK |
2123 | |
2124 | r = misc_register(&kvm_dev); | |
2125 | if (r) { | |
d77c26fc | 2126 | printk(KERN_ERR "kvm: misc device register failed\n"); |
6aa8b732 AK |
2127 | goto out_free; |
2128 | } | |
2129 | ||
15ad7146 AK |
2130 | kvm_preempt_ops.sched_in = kvm_sched_in; |
2131 | kvm_preempt_ops.sched_out = kvm_sched_out; | |
2132 | ||
0ea4ed8e DW |
2133 | kvm_init_debug(); |
2134 | ||
c7addb90 | 2135 | return 0; |
6aa8b732 AK |
2136 | |
2137 | out_free: | |
c16f862d | 2138 | kmem_cache_destroy(kvm_vcpu_cache); |
d2308784 | 2139 | out_free_5: |
59ae6c6b | 2140 | sysdev_unregister(&kvm_sysdev); |
d2308784 | 2141 | out_free_4: |
59ae6c6b | 2142 | sysdev_class_unregister(&kvm_sysdev_class); |
d2308784 | 2143 | out_free_3: |
6aa8b732 | 2144 | unregister_reboot_notifier(&kvm_reboot_notifier); |
774c47f1 | 2145 | unregister_cpu_notifier(&kvm_cpu_notifier); |
d2308784 | 2146 | out_free_2: |
d2308784 | 2147 | out_free_1: |
e9b11c17 | 2148 | kvm_arch_hardware_unsetup(); |
7f59f492 RR |
2149 | out_free_0a: |
2150 | free_cpumask_var(cpus_hardware_enabled); | |
d2308784 ZX |
2151 | out_free_0: |
2152 | __free_page(bad_page); | |
ca45aaae | 2153 | out: |
f8c16bba | 2154 | kvm_arch_exit(); |
d2308784 | 2155 | out_fail: |
6aa8b732 AK |
2156 | return r; |
2157 | } | |
cb498ea2 | 2158 | EXPORT_SYMBOL_GPL(kvm_init); |
6aa8b732 | 2159 | |
cb498ea2 | 2160 | void kvm_exit(void) |
6aa8b732 | 2161 | { |
229456fc | 2162 | tracepoint_synchronize_unregister(); |
0ea4ed8e | 2163 | kvm_exit_debug(); |
6aa8b732 | 2164 | misc_deregister(&kvm_dev); |
c16f862d | 2165 | kmem_cache_destroy(kvm_vcpu_cache); |
59ae6c6b AK |
2166 | sysdev_unregister(&kvm_sysdev); |
2167 | sysdev_class_unregister(&kvm_sysdev_class); | |
6aa8b732 | 2168 | unregister_reboot_notifier(&kvm_reboot_notifier); |
59ae6c6b | 2169 | unregister_cpu_notifier(&kvm_cpu_notifier); |
15c8b6c1 | 2170 | on_each_cpu(hardware_disable, NULL, 1); |
e9b11c17 | 2171 | kvm_arch_hardware_unsetup(); |
f8c16bba | 2172 | kvm_arch_exit(); |
7f59f492 | 2173 | free_cpumask_var(cpus_hardware_enabled); |
cea7bb21 | 2174 | __free_page(bad_page); |
6aa8b732 | 2175 | } |
cb498ea2 | 2176 | EXPORT_SYMBOL_GPL(kvm_exit); |