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 LV |
54 | #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET |
55 | #include "coalesced_mmio.h" | |
56 | #endif | |
57 | ||
229456fc MT |
58 | #define CREATE_TRACE_POINTS |
59 | #include <trace/events/kvm.h> | |
60 | ||
6aa8b732 AK |
61 | MODULE_AUTHOR("Qumranet"); |
62 | MODULE_LICENSE("GPL"); | |
63 | ||
fa40a821 MT |
64 | /* |
65 | * Ordering of locks: | |
66 | * | |
fae3a353 | 67 | * kvm->lock --> kvm->slots_lock --> kvm->irq_lock |
fa40a821 MT |
68 | */ |
69 | ||
e9b11c17 ZX |
70 | DEFINE_SPINLOCK(kvm_lock); |
71 | LIST_HEAD(vm_list); | |
133de902 | 72 | |
7f59f492 | 73 | static cpumask_var_t cpus_hardware_enabled; |
10474ae8 AG |
74 | static int kvm_usage_count = 0; |
75 | static atomic_t hardware_enable_failed; | |
1b6c0168 | 76 | |
c16f862d RR |
77 | struct kmem_cache *kvm_vcpu_cache; |
78 | EXPORT_SYMBOL_GPL(kvm_vcpu_cache); | |
1165f5fe | 79 | |
15ad7146 AK |
80 | static __read_mostly struct preempt_ops kvm_preempt_ops; |
81 | ||
76f7c879 | 82 | struct dentry *kvm_debugfs_dir; |
6aa8b732 | 83 | |
bccf2150 AK |
84 | static long kvm_vcpu_ioctl(struct file *file, unsigned int ioctl, |
85 | unsigned long arg); | |
10474ae8 AG |
86 | static int hardware_enable_all(void); |
87 | static void hardware_disable_all(void); | |
bccf2150 | 88 | |
e8ba5d31 | 89 | static bool kvm_rebooting; |
4ecac3fd | 90 | |
54dee993 MT |
91 | static bool largepages_enabled = true; |
92 | ||
c77fb9dc | 93 | inline int kvm_is_mmio_pfn(pfn_t pfn) |
cbff90a7 | 94 | { |
fc5659c8 JR |
95 | if (pfn_valid(pfn)) { |
96 | struct page *page = compound_head(pfn_to_page(pfn)); | |
97 | return PageReserved(page); | |
98 | } | |
cbff90a7 BAY |
99 | |
100 | return true; | |
101 | } | |
102 | ||
bccf2150 AK |
103 | /* |
104 | * Switches to specified vcpu, until a matching vcpu_put() | |
105 | */ | |
313a3dc7 | 106 | void vcpu_load(struct kvm_vcpu *vcpu) |
6aa8b732 | 107 | { |
15ad7146 AK |
108 | int cpu; |
109 | ||
bccf2150 | 110 | mutex_lock(&vcpu->mutex); |
15ad7146 AK |
111 | cpu = get_cpu(); |
112 | preempt_notifier_register(&vcpu->preempt_notifier); | |
313a3dc7 | 113 | kvm_arch_vcpu_load(vcpu, cpu); |
15ad7146 | 114 | put_cpu(); |
6aa8b732 AK |
115 | } |
116 | ||
313a3dc7 | 117 | void vcpu_put(struct kvm_vcpu *vcpu) |
6aa8b732 | 118 | { |
15ad7146 | 119 | preempt_disable(); |
313a3dc7 | 120 | kvm_arch_vcpu_put(vcpu); |
15ad7146 AK |
121 | preempt_notifier_unregister(&vcpu->preempt_notifier); |
122 | preempt_enable(); | |
6aa8b732 AK |
123 | mutex_unlock(&vcpu->mutex); |
124 | } | |
125 | ||
d9e368d6 AK |
126 | static void ack_flush(void *_completed) |
127 | { | |
d9e368d6 AK |
128 | } |
129 | ||
49846896 | 130 | static bool make_all_cpus_request(struct kvm *kvm, unsigned int req) |
d9e368d6 | 131 | { |
597a5f55 | 132 | int i, cpu, me; |
6ef7a1bc RR |
133 | cpumask_var_t cpus; |
134 | bool called = true; | |
d9e368d6 | 135 | struct kvm_vcpu *vcpu; |
d9e368d6 | 136 | |
79f55997 | 137 | zalloc_cpumask_var(&cpus, GFP_ATOMIC); |
6ef7a1bc | 138 | |
84261923 | 139 | spin_lock(&kvm->requests_lock); |
e601e3be | 140 | me = smp_processor_id(); |
988a2cae | 141 | kvm_for_each_vcpu(i, vcpu, kvm) { |
49846896 | 142 | if (test_and_set_bit(req, &vcpu->requests)) |
d9e368d6 AK |
143 | continue; |
144 | cpu = vcpu->cpu; | |
6ef7a1bc RR |
145 | if (cpus != NULL && cpu != -1 && cpu != me) |
146 | cpumask_set_cpu(cpu, cpus); | |
49846896 | 147 | } |
6ef7a1bc RR |
148 | if (unlikely(cpus == NULL)) |
149 | smp_call_function_many(cpu_online_mask, ack_flush, NULL, 1); | |
150 | else if (!cpumask_empty(cpus)) | |
151 | smp_call_function_many(cpus, ack_flush, NULL, 1); | |
152 | else | |
153 | called = false; | |
84261923 | 154 | spin_unlock(&kvm->requests_lock); |
6ef7a1bc | 155 | free_cpumask_var(cpus); |
49846896 | 156 | return called; |
d9e368d6 AK |
157 | } |
158 | ||
49846896 | 159 | void kvm_flush_remote_tlbs(struct kvm *kvm) |
2e53d63a | 160 | { |
49846896 RR |
161 | if (make_all_cpus_request(kvm, KVM_REQ_TLB_FLUSH)) |
162 | ++kvm->stat.remote_tlb_flush; | |
2e53d63a MT |
163 | } |
164 | ||
49846896 RR |
165 | void kvm_reload_remote_mmus(struct kvm *kvm) |
166 | { | |
167 | make_all_cpus_request(kvm, KVM_REQ_MMU_RELOAD); | |
168 | } | |
2e53d63a | 169 | |
fb3f0f51 RR |
170 | int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id) |
171 | { | |
172 | struct page *page; | |
173 | int r; | |
174 | ||
175 | mutex_init(&vcpu->mutex); | |
176 | vcpu->cpu = -1; | |
fb3f0f51 RR |
177 | vcpu->kvm = kvm; |
178 | vcpu->vcpu_id = id; | |
b6958ce4 | 179 | init_waitqueue_head(&vcpu->wq); |
fb3f0f51 RR |
180 | |
181 | page = alloc_page(GFP_KERNEL | __GFP_ZERO); | |
182 | if (!page) { | |
183 | r = -ENOMEM; | |
184 | goto fail; | |
185 | } | |
186 | vcpu->run = page_address(page); | |
187 | ||
e9b11c17 | 188 | r = kvm_arch_vcpu_init(vcpu); |
fb3f0f51 | 189 | if (r < 0) |
e9b11c17 | 190 | goto fail_free_run; |
fb3f0f51 RR |
191 | return 0; |
192 | ||
fb3f0f51 RR |
193 | fail_free_run: |
194 | free_page((unsigned long)vcpu->run); | |
195 | fail: | |
76fafa5e | 196 | return r; |
fb3f0f51 RR |
197 | } |
198 | EXPORT_SYMBOL_GPL(kvm_vcpu_init); | |
199 | ||
200 | void kvm_vcpu_uninit(struct kvm_vcpu *vcpu) | |
201 | { | |
e9b11c17 | 202 | kvm_arch_vcpu_uninit(vcpu); |
fb3f0f51 RR |
203 | free_page((unsigned long)vcpu->run); |
204 | } | |
205 | EXPORT_SYMBOL_GPL(kvm_vcpu_uninit); | |
206 | ||
e930bffe AA |
207 | #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER) |
208 | static inline struct kvm *mmu_notifier_to_kvm(struct mmu_notifier *mn) | |
209 | { | |
210 | return container_of(mn, struct kvm, mmu_notifier); | |
211 | } | |
212 | ||
213 | static void kvm_mmu_notifier_invalidate_page(struct mmu_notifier *mn, | |
214 | struct mm_struct *mm, | |
215 | unsigned long address) | |
216 | { | |
217 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
218 | int need_tlb_flush; | |
219 | ||
220 | /* | |
221 | * When ->invalidate_page runs, the linux pte has been zapped | |
222 | * already but the page is still allocated until | |
223 | * ->invalidate_page returns. So if we increase the sequence | |
224 | * here the kvm page fault will notice if the spte can't be | |
225 | * established because the page is going to be freed. If | |
226 | * instead the kvm page fault establishes the spte before | |
227 | * ->invalidate_page runs, kvm_unmap_hva will release it | |
228 | * before returning. | |
229 | * | |
230 | * The sequence increase only need to be seen at spin_unlock | |
231 | * time, and not at spin_lock time. | |
232 | * | |
233 | * Increasing the sequence after the spin_unlock would be | |
234 | * unsafe because the kvm page fault could then establish the | |
235 | * pte after kvm_unmap_hva returned, without noticing the page | |
236 | * is going to be freed. | |
237 | */ | |
238 | spin_lock(&kvm->mmu_lock); | |
239 | kvm->mmu_notifier_seq++; | |
240 | need_tlb_flush = kvm_unmap_hva(kvm, address); | |
241 | spin_unlock(&kvm->mmu_lock); | |
242 | ||
243 | /* we've to flush the tlb before the pages can be freed */ | |
244 | if (need_tlb_flush) | |
245 | kvm_flush_remote_tlbs(kvm); | |
246 | ||
247 | } | |
248 | ||
3da0dd43 IE |
249 | static void kvm_mmu_notifier_change_pte(struct mmu_notifier *mn, |
250 | struct mm_struct *mm, | |
251 | unsigned long address, | |
252 | pte_t pte) | |
253 | { | |
254 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
255 | ||
256 | spin_lock(&kvm->mmu_lock); | |
257 | kvm->mmu_notifier_seq++; | |
258 | kvm_set_spte_hva(kvm, address, pte); | |
259 | spin_unlock(&kvm->mmu_lock); | |
260 | } | |
261 | ||
e930bffe AA |
262 | static void kvm_mmu_notifier_invalidate_range_start(struct mmu_notifier *mn, |
263 | struct mm_struct *mm, | |
264 | unsigned long start, | |
265 | unsigned long end) | |
266 | { | |
267 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
268 | int need_tlb_flush = 0; | |
269 | ||
270 | spin_lock(&kvm->mmu_lock); | |
271 | /* | |
272 | * The count increase must become visible at unlock time as no | |
273 | * spte can be established without taking the mmu_lock and | |
274 | * count is also read inside the mmu_lock critical section. | |
275 | */ | |
276 | kvm->mmu_notifier_count++; | |
277 | for (; start < end; start += PAGE_SIZE) | |
278 | need_tlb_flush |= kvm_unmap_hva(kvm, start); | |
279 | spin_unlock(&kvm->mmu_lock); | |
280 | ||
281 | /* we've to flush the tlb before the pages can be freed */ | |
282 | if (need_tlb_flush) | |
283 | kvm_flush_remote_tlbs(kvm); | |
284 | } | |
285 | ||
286 | static void kvm_mmu_notifier_invalidate_range_end(struct mmu_notifier *mn, | |
287 | struct mm_struct *mm, | |
288 | unsigned long start, | |
289 | unsigned long end) | |
290 | { | |
291 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
292 | ||
293 | spin_lock(&kvm->mmu_lock); | |
294 | /* | |
295 | * This sequence increase will notify the kvm page fault that | |
296 | * the page that is going to be mapped in the spte could have | |
297 | * been freed. | |
298 | */ | |
299 | kvm->mmu_notifier_seq++; | |
300 | /* | |
301 | * The above sequence increase must be visible before the | |
302 | * below count decrease but both values are read by the kvm | |
303 | * page fault under mmu_lock spinlock so we don't need to add | |
304 | * a smb_wmb() here in between the two. | |
305 | */ | |
306 | kvm->mmu_notifier_count--; | |
307 | spin_unlock(&kvm->mmu_lock); | |
308 | ||
309 | BUG_ON(kvm->mmu_notifier_count < 0); | |
310 | } | |
311 | ||
312 | static int kvm_mmu_notifier_clear_flush_young(struct mmu_notifier *mn, | |
313 | struct mm_struct *mm, | |
314 | unsigned long address) | |
315 | { | |
316 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
317 | int young; | |
318 | ||
319 | spin_lock(&kvm->mmu_lock); | |
320 | young = kvm_age_hva(kvm, address); | |
321 | spin_unlock(&kvm->mmu_lock); | |
322 | ||
323 | if (young) | |
324 | kvm_flush_remote_tlbs(kvm); | |
325 | ||
326 | return young; | |
327 | } | |
328 | ||
85db06e5 MT |
329 | static void kvm_mmu_notifier_release(struct mmu_notifier *mn, |
330 | struct mm_struct *mm) | |
331 | { | |
332 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
333 | kvm_arch_flush_shadow(kvm); | |
334 | } | |
335 | ||
e930bffe AA |
336 | static const struct mmu_notifier_ops kvm_mmu_notifier_ops = { |
337 | .invalidate_page = kvm_mmu_notifier_invalidate_page, | |
338 | .invalidate_range_start = kvm_mmu_notifier_invalidate_range_start, | |
339 | .invalidate_range_end = kvm_mmu_notifier_invalidate_range_end, | |
340 | .clear_flush_young = kvm_mmu_notifier_clear_flush_young, | |
3da0dd43 | 341 | .change_pte = kvm_mmu_notifier_change_pte, |
85db06e5 | 342 | .release = kvm_mmu_notifier_release, |
e930bffe AA |
343 | }; |
344 | #endif /* CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER */ | |
345 | ||
f17abe9a | 346 | static struct kvm *kvm_create_vm(void) |
6aa8b732 | 347 | { |
10474ae8 | 348 | int r = 0; |
d19a9cd2 | 349 | struct kvm *kvm = kvm_arch_create_vm(); |
5f94c174 LV |
350 | #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET |
351 | struct page *page; | |
352 | #endif | |
6aa8b732 | 353 | |
d19a9cd2 ZX |
354 | if (IS_ERR(kvm)) |
355 | goto out; | |
10474ae8 AG |
356 | |
357 | r = hardware_enable_all(); | |
358 | if (r) | |
359 | goto out_err_nodisable; | |
360 | ||
75858a84 AK |
361 | #ifdef CONFIG_HAVE_KVM_IRQCHIP |
362 | INIT_HLIST_HEAD(&kvm->mask_notifier_list); | |
136bdfee | 363 | INIT_HLIST_HEAD(&kvm->irq_ack_notifier_list); |
75858a84 | 364 | #endif |
6aa8b732 | 365 | |
5f94c174 LV |
366 | #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET |
367 | page = alloc_page(GFP_KERNEL | __GFP_ZERO); | |
368 | if (!page) { | |
10474ae8 AG |
369 | r = -ENOMEM; |
370 | goto out_err; | |
5f94c174 LV |
371 | } |
372 | kvm->coalesced_mmio_ring = | |
373 | (struct kvm_coalesced_mmio_ring *)page_address(page); | |
374 | #endif | |
375 | ||
e930bffe AA |
376 | #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER) |
377 | { | |
e930bffe | 378 | kvm->mmu_notifier.ops = &kvm_mmu_notifier_ops; |
10474ae8 AG |
379 | r = mmu_notifier_register(&kvm->mmu_notifier, current->mm); |
380 | if (r) { | |
e930bffe AA |
381 | #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET |
382 | put_page(page); | |
383 | #endif | |
10474ae8 | 384 | goto out_err; |
e930bffe AA |
385 | } |
386 | } | |
387 | #endif | |
388 | ||
6d4e4c4f AK |
389 | kvm->mm = current->mm; |
390 | atomic_inc(&kvm->mm->mm_count); | |
aaee2c94 | 391 | spin_lock_init(&kvm->mmu_lock); |
84261923 | 392 | spin_lock_init(&kvm->requests_lock); |
74906345 | 393 | kvm_io_bus_init(&kvm->pio_bus); |
d34e6b17 | 394 | kvm_eventfd_init(kvm); |
11ec2804 | 395 | mutex_init(&kvm->lock); |
60eead79 | 396 | mutex_init(&kvm->irq_lock); |
2eeb2e94 | 397 | kvm_io_bus_init(&kvm->mmio_bus); |
72dc67a6 | 398 | init_rwsem(&kvm->slots_lock); |
d39f13b0 | 399 | atomic_set(&kvm->users_count, 1); |
5e58cfe4 RR |
400 | spin_lock(&kvm_lock); |
401 | list_add(&kvm->vm_list, &vm_list); | |
402 | spin_unlock(&kvm_lock); | |
5f94c174 LV |
403 | #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET |
404 | kvm_coalesced_mmio_init(kvm); | |
405 | #endif | |
d19a9cd2 | 406 | out: |
f17abe9a | 407 | return kvm; |
10474ae8 | 408 | |
b4329db0 HC |
409 | #if defined(KVM_COALESCED_MMIO_PAGE_OFFSET) || \ |
410 | (defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)) | |
10474ae8 AG |
411 | out_err: |
412 | hardware_disable_all(); | |
b4329db0 | 413 | #endif |
10474ae8 AG |
414 | out_err_nodisable: |
415 | kfree(kvm); | |
416 | return ERR_PTR(r); | |
f17abe9a AK |
417 | } |
418 | ||
6aa8b732 AK |
419 | /* |
420 | * Free any memory in @free but not in @dont. | |
421 | */ | |
422 | static void kvm_free_physmem_slot(struct kvm_memory_slot *free, | |
423 | struct kvm_memory_slot *dont) | |
424 | { | |
ec04b260 JR |
425 | int i; |
426 | ||
290fc38d IE |
427 | if (!dont || free->rmap != dont->rmap) |
428 | vfree(free->rmap); | |
6aa8b732 AK |
429 | |
430 | if (!dont || free->dirty_bitmap != dont->dirty_bitmap) | |
431 | vfree(free->dirty_bitmap); | |
432 | ||
ec04b260 JR |
433 | |
434 | for (i = 0; i < KVM_NR_PAGE_SIZES - 1; ++i) { | |
435 | if (!dont || free->lpage_info[i] != dont->lpage_info[i]) { | |
436 | vfree(free->lpage_info[i]); | |
437 | free->lpage_info[i] = NULL; | |
438 | } | |
439 | } | |
05da4558 | 440 | |
6aa8b732 | 441 | free->npages = 0; |
8b6d44c7 | 442 | free->dirty_bitmap = NULL; |
8d4e1288 | 443 | free->rmap = NULL; |
6aa8b732 AK |
444 | } |
445 | ||
d19a9cd2 | 446 | void kvm_free_physmem(struct kvm *kvm) |
6aa8b732 AK |
447 | { |
448 | int i; | |
449 | ||
450 | for (i = 0; i < kvm->nmemslots; ++i) | |
8b6d44c7 | 451 | kvm_free_physmem_slot(&kvm->memslots[i], NULL); |
6aa8b732 AK |
452 | } |
453 | ||
f17abe9a AK |
454 | static void kvm_destroy_vm(struct kvm *kvm) |
455 | { | |
6d4e4c4f AK |
456 | struct mm_struct *mm = kvm->mm; |
457 | ||
ad8ba2cd | 458 | kvm_arch_sync_events(kvm); |
133de902 AK |
459 | spin_lock(&kvm_lock); |
460 | list_del(&kvm->vm_list); | |
461 | spin_unlock(&kvm_lock); | |
399ec807 | 462 | kvm_free_irq_routing(kvm); |
74906345 | 463 | kvm_io_bus_destroy(&kvm->pio_bus); |
2eeb2e94 | 464 | kvm_io_bus_destroy(&kvm->mmio_bus); |
5f94c174 LV |
465 | #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET |
466 | if (kvm->coalesced_mmio_ring != NULL) | |
467 | free_page((unsigned long)kvm->coalesced_mmio_ring); | |
e930bffe AA |
468 | #endif |
469 | #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER) | |
470 | mmu_notifier_unregister(&kvm->mmu_notifier, kvm->mm); | |
f00be0ca GN |
471 | #else |
472 | kvm_arch_flush_shadow(kvm); | |
5f94c174 | 473 | #endif |
d19a9cd2 | 474 | kvm_arch_destroy_vm(kvm); |
10474ae8 | 475 | hardware_disable_all(); |
6d4e4c4f | 476 | mmdrop(mm); |
f17abe9a AK |
477 | } |
478 | ||
d39f13b0 IE |
479 | void kvm_get_kvm(struct kvm *kvm) |
480 | { | |
481 | atomic_inc(&kvm->users_count); | |
482 | } | |
483 | EXPORT_SYMBOL_GPL(kvm_get_kvm); | |
484 | ||
485 | void kvm_put_kvm(struct kvm *kvm) | |
486 | { | |
487 | if (atomic_dec_and_test(&kvm->users_count)) | |
488 | kvm_destroy_vm(kvm); | |
489 | } | |
490 | EXPORT_SYMBOL_GPL(kvm_put_kvm); | |
491 | ||
492 | ||
f17abe9a AK |
493 | static int kvm_vm_release(struct inode *inode, struct file *filp) |
494 | { | |
495 | struct kvm *kvm = filp->private_data; | |
496 | ||
721eecbf GH |
497 | kvm_irqfd_release(kvm); |
498 | ||
d39f13b0 | 499 | kvm_put_kvm(kvm); |
6aa8b732 AK |
500 | return 0; |
501 | } | |
502 | ||
6aa8b732 AK |
503 | /* |
504 | * Allocate some memory and give it an address in the guest physical address | |
505 | * space. | |
506 | * | |
507 | * Discontiguous memory is allowed, mostly for framebuffers. | |
f78e0e2e | 508 | * |
10589a46 | 509 | * Must be called holding mmap_sem for write. |
6aa8b732 | 510 | */ |
f78e0e2e SY |
511 | int __kvm_set_memory_region(struct kvm *kvm, |
512 | struct kvm_userspace_memory_region *mem, | |
513 | int user_alloc) | |
6aa8b732 AK |
514 | { |
515 | int r; | |
516 | gfn_t base_gfn; | |
28bcb112 HC |
517 | unsigned long npages; |
518 | unsigned long i; | |
6aa8b732 AK |
519 | struct kvm_memory_slot *memslot; |
520 | struct kvm_memory_slot old, new; | |
6aa8b732 AK |
521 | |
522 | r = -EINVAL; | |
523 | /* General sanity checks */ | |
524 | if (mem->memory_size & (PAGE_SIZE - 1)) | |
525 | goto out; | |
526 | if (mem->guest_phys_addr & (PAGE_SIZE - 1)) | |
527 | goto out; | |
e7cacd40 | 528 | if (user_alloc && (mem->userspace_addr & (PAGE_SIZE - 1))) |
78749809 | 529 | goto out; |
e0d62c7f | 530 | if (mem->slot >= KVM_MEMORY_SLOTS + KVM_PRIVATE_MEM_SLOTS) |
6aa8b732 AK |
531 | goto out; |
532 | if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr) | |
533 | goto out; | |
534 | ||
535 | memslot = &kvm->memslots[mem->slot]; | |
536 | base_gfn = mem->guest_phys_addr >> PAGE_SHIFT; | |
537 | npages = mem->memory_size >> PAGE_SHIFT; | |
538 | ||
539 | if (!npages) | |
540 | mem->flags &= ~KVM_MEM_LOG_DIRTY_PAGES; | |
541 | ||
6aa8b732 AK |
542 | new = old = *memslot; |
543 | ||
544 | new.base_gfn = base_gfn; | |
545 | new.npages = npages; | |
546 | new.flags = mem->flags; | |
547 | ||
548 | /* Disallow changing a memory slot's size. */ | |
549 | r = -EINVAL; | |
550 | if (npages && old.npages && npages != old.npages) | |
f78e0e2e | 551 | goto out_free; |
6aa8b732 AK |
552 | |
553 | /* Check for overlaps */ | |
554 | r = -EEXIST; | |
555 | for (i = 0; i < KVM_MEMORY_SLOTS; ++i) { | |
556 | struct kvm_memory_slot *s = &kvm->memslots[i]; | |
557 | ||
4cd481f6 | 558 | if (s == memslot || !s->npages) |
6aa8b732 AK |
559 | continue; |
560 | if (!((base_gfn + npages <= s->base_gfn) || | |
561 | (base_gfn >= s->base_gfn + s->npages))) | |
f78e0e2e | 562 | goto out_free; |
6aa8b732 | 563 | } |
6aa8b732 | 564 | |
6aa8b732 AK |
565 | /* Free page dirty bitmap if unneeded */ |
566 | if (!(new.flags & KVM_MEM_LOG_DIRTY_PAGES)) | |
8b6d44c7 | 567 | new.dirty_bitmap = NULL; |
6aa8b732 AK |
568 | |
569 | r = -ENOMEM; | |
570 | ||
571 | /* Allocate if a slot is being created */ | |
eff0114a | 572 | #ifndef CONFIG_S390 |
8d4e1288 | 573 | if (npages && !new.rmap) { |
d77c26fc | 574 | new.rmap = vmalloc(npages * sizeof(struct page *)); |
290fc38d IE |
575 | |
576 | if (!new.rmap) | |
f78e0e2e | 577 | goto out_free; |
290fc38d | 578 | |
290fc38d | 579 | memset(new.rmap, 0, npages * sizeof(*new.rmap)); |
8d4e1288 | 580 | |
80b14b5b | 581 | new.user_alloc = user_alloc; |
604b38ac AA |
582 | /* |
583 | * hva_to_rmmap() serialzies with the mmu_lock and to be | |
584 | * safe it has to ignore memslots with !user_alloc && | |
585 | * !userspace_addr. | |
586 | */ | |
587 | if (user_alloc) | |
588 | new.userspace_addr = mem->userspace_addr; | |
589 | else | |
590 | new.userspace_addr = 0; | |
6aa8b732 | 591 | } |
ec04b260 JR |
592 | if (!npages) |
593 | goto skip_lpage; | |
05da4558 | 594 | |
ec04b260 | 595 | for (i = 0; i < KVM_NR_PAGE_SIZES - 1; ++i) { |
28bcb112 HC |
596 | unsigned long ugfn; |
597 | unsigned long j; | |
598 | int lpages; | |
ec04b260 | 599 | int level = i + 2; |
05da4558 | 600 | |
ec04b260 JR |
601 | /* Avoid unused variable warning if no large pages */ |
602 | (void)level; | |
603 | ||
604 | if (new.lpage_info[i]) | |
605 | continue; | |
606 | ||
607 | lpages = 1 + (base_gfn + npages - 1) / | |
608 | KVM_PAGES_PER_HPAGE(level); | |
609 | lpages -= base_gfn / KVM_PAGES_PER_HPAGE(level); | |
610 | ||
611 | new.lpage_info[i] = vmalloc(lpages * sizeof(*new.lpage_info[i])); | |
612 | ||
613 | if (!new.lpage_info[i]) | |
05da4558 MT |
614 | goto out_free; |
615 | ||
ec04b260 JR |
616 | memset(new.lpage_info[i], 0, |
617 | lpages * sizeof(*new.lpage_info[i])); | |
05da4558 | 618 | |
ec04b260 JR |
619 | if (base_gfn % KVM_PAGES_PER_HPAGE(level)) |
620 | new.lpage_info[i][0].write_count = 1; | |
621 | if ((base_gfn+npages) % KVM_PAGES_PER_HPAGE(level)) | |
622 | new.lpage_info[i][lpages - 1].write_count = 1; | |
ac04527f AK |
623 | ugfn = new.userspace_addr >> PAGE_SHIFT; |
624 | /* | |
625 | * If the gfn and userspace address are not aligned wrt each | |
54dee993 MT |
626 | * other, or if explicitly asked to, disable large page |
627 | * support for this slot | |
ac04527f | 628 | */ |
ec04b260 | 629 | if ((base_gfn ^ ugfn) & (KVM_PAGES_PER_HPAGE(level) - 1) || |
54dee993 | 630 | !largepages_enabled) |
ec04b260 JR |
631 | for (j = 0; j < lpages; ++j) |
632 | new.lpage_info[i][j].write_count = 1; | |
05da4558 | 633 | } |
6aa8b732 | 634 | |
ec04b260 JR |
635 | skip_lpage: |
636 | ||
6aa8b732 AK |
637 | /* Allocate page dirty bitmap if needed */ |
638 | if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) { | |
639 | unsigned dirty_bytes = ALIGN(npages, BITS_PER_LONG) / 8; | |
640 | ||
641 | new.dirty_bitmap = vmalloc(dirty_bytes); | |
642 | if (!new.dirty_bitmap) | |
f78e0e2e | 643 | goto out_free; |
6aa8b732 | 644 | memset(new.dirty_bitmap, 0, dirty_bytes); |
e244584f IE |
645 | if (old.npages) |
646 | kvm_arch_flush_shadow(kvm); | |
6aa8b732 | 647 | } |
3eea8437 CB |
648 | #else /* not defined CONFIG_S390 */ |
649 | new.user_alloc = user_alloc; | |
650 | if (user_alloc) | |
651 | new.userspace_addr = mem->userspace_addr; | |
eff0114a | 652 | #endif /* not defined CONFIG_S390 */ |
6aa8b732 | 653 | |
34d4cb8f MT |
654 | if (!npages) |
655 | kvm_arch_flush_shadow(kvm); | |
656 | ||
604b38ac AA |
657 | spin_lock(&kvm->mmu_lock); |
658 | if (mem->slot >= kvm->nmemslots) | |
659 | kvm->nmemslots = mem->slot + 1; | |
660 | ||
3ad82a7e | 661 | *memslot = new; |
604b38ac | 662 | spin_unlock(&kvm->mmu_lock); |
3ad82a7e | 663 | |
0de10343 ZX |
664 | r = kvm_arch_set_memory_region(kvm, mem, old, user_alloc); |
665 | if (r) { | |
604b38ac | 666 | spin_lock(&kvm->mmu_lock); |
0de10343 | 667 | *memslot = old; |
604b38ac | 668 | spin_unlock(&kvm->mmu_lock); |
0de10343 | 669 | goto out_free; |
82ce2c96 IE |
670 | } |
671 | ||
6f897248 GC |
672 | kvm_free_physmem_slot(&old, npages ? &new : NULL); |
673 | /* Slot deletion case: we have to update the current slot */ | |
b43b1901 | 674 | spin_lock(&kvm->mmu_lock); |
6f897248 GC |
675 | if (!npages) |
676 | *memslot = old; | |
b43b1901 | 677 | spin_unlock(&kvm->mmu_lock); |
8a98f664 | 678 | #ifdef CONFIG_DMAR |
62c476c7 BAY |
679 | /* map the pages in iommu page table */ |
680 | r = kvm_iommu_map_pages(kvm, base_gfn, npages); | |
681 | if (r) | |
682 | goto out; | |
8a98f664 | 683 | #endif |
6aa8b732 AK |
684 | return 0; |
685 | ||
f78e0e2e | 686 | out_free: |
6aa8b732 AK |
687 | kvm_free_physmem_slot(&new, &old); |
688 | out: | |
689 | return r; | |
210c7c4d IE |
690 | |
691 | } | |
f78e0e2e SY |
692 | EXPORT_SYMBOL_GPL(__kvm_set_memory_region); |
693 | ||
694 | int kvm_set_memory_region(struct kvm *kvm, | |
695 | struct kvm_userspace_memory_region *mem, | |
696 | int user_alloc) | |
697 | { | |
698 | int r; | |
699 | ||
72dc67a6 | 700 | down_write(&kvm->slots_lock); |
f78e0e2e | 701 | r = __kvm_set_memory_region(kvm, mem, user_alloc); |
72dc67a6 | 702 | up_write(&kvm->slots_lock); |
f78e0e2e SY |
703 | return r; |
704 | } | |
210c7c4d IE |
705 | EXPORT_SYMBOL_GPL(kvm_set_memory_region); |
706 | ||
1fe779f8 CO |
707 | int kvm_vm_ioctl_set_memory_region(struct kvm *kvm, |
708 | struct | |
709 | kvm_userspace_memory_region *mem, | |
710 | int user_alloc) | |
210c7c4d | 711 | { |
e0d62c7f IE |
712 | if (mem->slot >= KVM_MEMORY_SLOTS) |
713 | return -EINVAL; | |
210c7c4d | 714 | return kvm_set_memory_region(kvm, mem, user_alloc); |
6aa8b732 AK |
715 | } |
716 | ||
5bb064dc ZX |
717 | int kvm_get_dirty_log(struct kvm *kvm, |
718 | struct kvm_dirty_log *log, int *is_dirty) | |
6aa8b732 AK |
719 | { |
720 | struct kvm_memory_slot *memslot; | |
721 | int r, i; | |
722 | int n; | |
723 | unsigned long any = 0; | |
724 | ||
6aa8b732 AK |
725 | r = -EINVAL; |
726 | if (log->slot >= KVM_MEMORY_SLOTS) | |
727 | goto out; | |
728 | ||
729 | memslot = &kvm->memslots[log->slot]; | |
730 | r = -ENOENT; | |
731 | if (!memslot->dirty_bitmap) | |
732 | goto out; | |
733 | ||
cd1a4a98 | 734 | n = ALIGN(memslot->npages, BITS_PER_LONG) / 8; |
6aa8b732 | 735 | |
cd1a4a98 | 736 | for (i = 0; !any && i < n/sizeof(long); ++i) |
6aa8b732 AK |
737 | any = memslot->dirty_bitmap[i]; |
738 | ||
739 | r = -EFAULT; | |
740 | if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n)) | |
741 | goto out; | |
742 | ||
5bb064dc ZX |
743 | if (any) |
744 | *is_dirty = 1; | |
6aa8b732 AK |
745 | |
746 | r = 0; | |
6aa8b732 | 747 | out: |
6aa8b732 AK |
748 | return r; |
749 | } | |
750 | ||
54dee993 MT |
751 | void kvm_disable_largepages(void) |
752 | { | |
753 | largepages_enabled = false; | |
754 | } | |
755 | EXPORT_SYMBOL_GPL(kvm_disable_largepages); | |
756 | ||
cea7bb21 IE |
757 | int is_error_page(struct page *page) |
758 | { | |
759 | return page == bad_page; | |
760 | } | |
761 | EXPORT_SYMBOL_GPL(is_error_page); | |
762 | ||
35149e21 AL |
763 | int is_error_pfn(pfn_t pfn) |
764 | { | |
765 | return pfn == bad_pfn; | |
766 | } | |
767 | EXPORT_SYMBOL_GPL(is_error_pfn); | |
768 | ||
f9d46eb0 IE |
769 | static inline unsigned long bad_hva(void) |
770 | { | |
771 | return PAGE_OFFSET; | |
772 | } | |
773 | ||
774 | int kvm_is_error_hva(unsigned long addr) | |
775 | { | |
776 | return addr == bad_hva(); | |
777 | } | |
778 | EXPORT_SYMBOL_GPL(kvm_is_error_hva); | |
779 | ||
2843099f | 780 | struct kvm_memory_slot *gfn_to_memslot_unaliased(struct kvm *kvm, gfn_t gfn) |
6aa8b732 AK |
781 | { |
782 | int i; | |
783 | ||
784 | for (i = 0; i < kvm->nmemslots; ++i) { | |
785 | struct kvm_memory_slot *memslot = &kvm->memslots[i]; | |
786 | ||
787 | if (gfn >= memslot->base_gfn | |
788 | && gfn < memslot->base_gfn + memslot->npages) | |
789 | return memslot; | |
790 | } | |
8b6d44c7 | 791 | return NULL; |
6aa8b732 | 792 | } |
2843099f | 793 | EXPORT_SYMBOL_GPL(gfn_to_memslot_unaliased); |
e8207547 AK |
794 | |
795 | struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn) | |
796 | { | |
797 | gfn = unalias_gfn(kvm, gfn); | |
2843099f | 798 | return gfn_to_memslot_unaliased(kvm, gfn); |
e8207547 | 799 | } |
6aa8b732 | 800 | |
e0d62c7f IE |
801 | int kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn) |
802 | { | |
803 | int i; | |
804 | ||
805 | gfn = unalias_gfn(kvm, gfn); | |
806 | for (i = 0; i < KVM_MEMORY_SLOTS; ++i) { | |
807 | struct kvm_memory_slot *memslot = &kvm->memslots[i]; | |
808 | ||
809 | if (gfn >= memslot->base_gfn | |
810 | && gfn < memslot->base_gfn + memslot->npages) | |
811 | return 1; | |
812 | } | |
813 | return 0; | |
814 | } | |
815 | EXPORT_SYMBOL_GPL(kvm_is_visible_gfn); | |
816 | ||
05da4558 | 817 | unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn) |
539cb660 IE |
818 | { |
819 | struct kvm_memory_slot *slot; | |
820 | ||
821 | gfn = unalias_gfn(kvm, gfn); | |
2843099f | 822 | slot = gfn_to_memslot_unaliased(kvm, gfn); |
539cb660 IE |
823 | if (!slot) |
824 | return bad_hva(); | |
825 | return (slot->userspace_addr + (gfn - slot->base_gfn) * PAGE_SIZE); | |
826 | } | |
0d150298 | 827 | EXPORT_SYMBOL_GPL(gfn_to_hva); |
539cb660 | 828 | |
35149e21 | 829 | pfn_t gfn_to_pfn(struct kvm *kvm, gfn_t gfn) |
954bbbc2 | 830 | { |
8d4e1288 | 831 | struct page *page[1]; |
539cb660 | 832 | unsigned long addr; |
8d4e1288 | 833 | int npages; |
2e2e3738 | 834 | pfn_t pfn; |
954bbbc2 | 835 | |
60395224 AK |
836 | might_sleep(); |
837 | ||
539cb660 IE |
838 | addr = gfn_to_hva(kvm, gfn); |
839 | if (kvm_is_error_hva(addr)) { | |
8a7ae055 | 840 | get_page(bad_page); |
35149e21 | 841 | return page_to_pfn(bad_page); |
8a7ae055 | 842 | } |
8d4e1288 | 843 | |
4c2155ce | 844 | npages = get_user_pages_fast(addr, 1, 1, page); |
539cb660 | 845 | |
2e2e3738 AL |
846 | if (unlikely(npages != 1)) { |
847 | struct vm_area_struct *vma; | |
848 | ||
4c2155ce | 849 | down_read(¤t->mm->mmap_sem); |
2e2e3738 | 850 | vma = find_vma(current->mm, addr); |
4c2155ce | 851 | |
2e2e3738 AL |
852 | if (vma == NULL || addr < vma->vm_start || |
853 | !(vma->vm_flags & VM_PFNMAP)) { | |
4c2155ce | 854 | up_read(¤t->mm->mmap_sem); |
2e2e3738 AL |
855 | get_page(bad_page); |
856 | return page_to_pfn(bad_page); | |
857 | } | |
858 | ||
859 | pfn = ((addr - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff; | |
4c2155ce | 860 | up_read(¤t->mm->mmap_sem); |
c77fb9dc | 861 | BUG_ON(!kvm_is_mmio_pfn(pfn)); |
2e2e3738 AL |
862 | } else |
863 | pfn = page_to_pfn(page[0]); | |
8d4e1288 | 864 | |
2e2e3738 | 865 | return pfn; |
35149e21 AL |
866 | } |
867 | ||
868 | EXPORT_SYMBOL_GPL(gfn_to_pfn); | |
869 | ||
870 | struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn) | |
871 | { | |
2e2e3738 AL |
872 | pfn_t pfn; |
873 | ||
874 | pfn = gfn_to_pfn(kvm, gfn); | |
c77fb9dc | 875 | if (!kvm_is_mmio_pfn(pfn)) |
2e2e3738 AL |
876 | return pfn_to_page(pfn); |
877 | ||
c77fb9dc | 878 | WARN_ON(kvm_is_mmio_pfn(pfn)); |
2e2e3738 AL |
879 | |
880 | get_page(bad_page); | |
881 | return bad_page; | |
954bbbc2 | 882 | } |
aab61cc0 | 883 | |
954bbbc2 AK |
884 | EXPORT_SYMBOL_GPL(gfn_to_page); |
885 | ||
b4231d61 IE |
886 | void kvm_release_page_clean(struct page *page) |
887 | { | |
35149e21 | 888 | kvm_release_pfn_clean(page_to_pfn(page)); |
b4231d61 IE |
889 | } |
890 | EXPORT_SYMBOL_GPL(kvm_release_page_clean); | |
891 | ||
35149e21 AL |
892 | void kvm_release_pfn_clean(pfn_t pfn) |
893 | { | |
c77fb9dc | 894 | if (!kvm_is_mmio_pfn(pfn)) |
2e2e3738 | 895 | put_page(pfn_to_page(pfn)); |
35149e21 AL |
896 | } |
897 | EXPORT_SYMBOL_GPL(kvm_release_pfn_clean); | |
898 | ||
b4231d61 | 899 | void kvm_release_page_dirty(struct page *page) |
8a7ae055 | 900 | { |
35149e21 AL |
901 | kvm_release_pfn_dirty(page_to_pfn(page)); |
902 | } | |
903 | EXPORT_SYMBOL_GPL(kvm_release_page_dirty); | |
904 | ||
905 | void kvm_release_pfn_dirty(pfn_t pfn) | |
906 | { | |
907 | kvm_set_pfn_dirty(pfn); | |
908 | kvm_release_pfn_clean(pfn); | |
909 | } | |
910 | EXPORT_SYMBOL_GPL(kvm_release_pfn_dirty); | |
911 | ||
912 | void kvm_set_page_dirty(struct page *page) | |
913 | { | |
914 | kvm_set_pfn_dirty(page_to_pfn(page)); | |
915 | } | |
916 | EXPORT_SYMBOL_GPL(kvm_set_page_dirty); | |
917 | ||
918 | void kvm_set_pfn_dirty(pfn_t pfn) | |
919 | { | |
c77fb9dc | 920 | if (!kvm_is_mmio_pfn(pfn)) { |
2e2e3738 AL |
921 | struct page *page = pfn_to_page(pfn); |
922 | if (!PageReserved(page)) | |
923 | SetPageDirty(page); | |
924 | } | |
8a7ae055 | 925 | } |
35149e21 AL |
926 | EXPORT_SYMBOL_GPL(kvm_set_pfn_dirty); |
927 | ||
928 | void kvm_set_pfn_accessed(pfn_t pfn) | |
929 | { | |
c77fb9dc | 930 | if (!kvm_is_mmio_pfn(pfn)) |
2e2e3738 | 931 | mark_page_accessed(pfn_to_page(pfn)); |
35149e21 AL |
932 | } |
933 | EXPORT_SYMBOL_GPL(kvm_set_pfn_accessed); | |
934 | ||
935 | void kvm_get_pfn(pfn_t pfn) | |
936 | { | |
c77fb9dc | 937 | if (!kvm_is_mmio_pfn(pfn)) |
2e2e3738 | 938 | get_page(pfn_to_page(pfn)); |
35149e21 AL |
939 | } |
940 | EXPORT_SYMBOL_GPL(kvm_get_pfn); | |
8a7ae055 | 941 | |
195aefde IE |
942 | static int next_segment(unsigned long len, int offset) |
943 | { | |
944 | if (len > PAGE_SIZE - offset) | |
945 | return PAGE_SIZE - offset; | |
946 | else | |
947 | return len; | |
948 | } | |
949 | ||
950 | int kvm_read_guest_page(struct kvm *kvm, gfn_t gfn, void *data, int offset, | |
951 | int len) | |
952 | { | |
e0506bcb IE |
953 | int r; |
954 | unsigned long addr; | |
195aefde | 955 | |
e0506bcb IE |
956 | addr = gfn_to_hva(kvm, gfn); |
957 | if (kvm_is_error_hva(addr)) | |
958 | return -EFAULT; | |
959 | r = copy_from_user(data, (void __user *)addr + offset, len); | |
960 | if (r) | |
195aefde | 961 | return -EFAULT; |
195aefde IE |
962 | return 0; |
963 | } | |
964 | EXPORT_SYMBOL_GPL(kvm_read_guest_page); | |
965 | ||
966 | int kvm_read_guest(struct kvm *kvm, gpa_t gpa, void *data, unsigned long len) | |
967 | { | |
968 | gfn_t gfn = gpa >> PAGE_SHIFT; | |
969 | int seg; | |
970 | int offset = offset_in_page(gpa); | |
971 | int ret; | |
972 | ||
973 | while ((seg = next_segment(len, offset)) != 0) { | |
974 | ret = kvm_read_guest_page(kvm, gfn, data, offset, seg); | |
975 | if (ret < 0) | |
976 | return ret; | |
977 | offset = 0; | |
978 | len -= seg; | |
979 | data += seg; | |
980 | ++gfn; | |
981 | } | |
982 | return 0; | |
983 | } | |
984 | EXPORT_SYMBOL_GPL(kvm_read_guest); | |
985 | ||
7ec54588 MT |
986 | int kvm_read_guest_atomic(struct kvm *kvm, gpa_t gpa, void *data, |
987 | unsigned long len) | |
988 | { | |
989 | int r; | |
990 | unsigned long addr; | |
991 | gfn_t gfn = gpa >> PAGE_SHIFT; | |
992 | int offset = offset_in_page(gpa); | |
993 | ||
994 | addr = gfn_to_hva(kvm, gfn); | |
995 | if (kvm_is_error_hva(addr)) | |
996 | return -EFAULT; | |
0aac03f0 | 997 | pagefault_disable(); |
7ec54588 | 998 | r = __copy_from_user_inatomic(data, (void __user *)addr + offset, len); |
0aac03f0 | 999 | pagefault_enable(); |
7ec54588 MT |
1000 | if (r) |
1001 | return -EFAULT; | |
1002 | return 0; | |
1003 | } | |
1004 | EXPORT_SYMBOL(kvm_read_guest_atomic); | |
1005 | ||
195aefde IE |
1006 | int kvm_write_guest_page(struct kvm *kvm, gfn_t gfn, const void *data, |
1007 | int offset, int len) | |
1008 | { | |
e0506bcb IE |
1009 | int r; |
1010 | unsigned long addr; | |
195aefde | 1011 | |
e0506bcb IE |
1012 | addr = gfn_to_hva(kvm, gfn); |
1013 | if (kvm_is_error_hva(addr)) | |
1014 | return -EFAULT; | |
1015 | r = copy_to_user((void __user *)addr + offset, data, len); | |
1016 | if (r) | |
195aefde | 1017 | return -EFAULT; |
195aefde IE |
1018 | mark_page_dirty(kvm, gfn); |
1019 | return 0; | |
1020 | } | |
1021 | EXPORT_SYMBOL_GPL(kvm_write_guest_page); | |
1022 | ||
1023 | int kvm_write_guest(struct kvm *kvm, gpa_t gpa, const void *data, | |
1024 | unsigned long len) | |
1025 | { | |
1026 | gfn_t gfn = gpa >> PAGE_SHIFT; | |
1027 | int seg; | |
1028 | int offset = offset_in_page(gpa); | |
1029 | int ret; | |
1030 | ||
1031 | while ((seg = next_segment(len, offset)) != 0) { | |
1032 | ret = kvm_write_guest_page(kvm, gfn, data, offset, seg); | |
1033 | if (ret < 0) | |
1034 | return ret; | |
1035 | offset = 0; | |
1036 | len -= seg; | |
1037 | data += seg; | |
1038 | ++gfn; | |
1039 | } | |
1040 | return 0; | |
1041 | } | |
1042 | ||
1043 | int kvm_clear_guest_page(struct kvm *kvm, gfn_t gfn, int offset, int len) | |
1044 | { | |
3e021bf5 | 1045 | return kvm_write_guest_page(kvm, gfn, empty_zero_page, offset, len); |
195aefde IE |
1046 | } |
1047 | EXPORT_SYMBOL_GPL(kvm_clear_guest_page); | |
1048 | ||
1049 | int kvm_clear_guest(struct kvm *kvm, gpa_t gpa, unsigned long len) | |
1050 | { | |
1051 | gfn_t gfn = gpa >> PAGE_SHIFT; | |
1052 | int seg; | |
1053 | int offset = offset_in_page(gpa); | |
1054 | int ret; | |
1055 | ||
1056 | while ((seg = next_segment(len, offset)) != 0) { | |
1057 | ret = kvm_clear_guest_page(kvm, gfn, offset, seg); | |
1058 | if (ret < 0) | |
1059 | return ret; | |
1060 | offset = 0; | |
1061 | len -= seg; | |
1062 | ++gfn; | |
1063 | } | |
1064 | return 0; | |
1065 | } | |
1066 | EXPORT_SYMBOL_GPL(kvm_clear_guest); | |
1067 | ||
6aa8b732 AK |
1068 | void mark_page_dirty(struct kvm *kvm, gfn_t gfn) |
1069 | { | |
31389947 | 1070 | struct kvm_memory_slot *memslot; |
6aa8b732 | 1071 | |
3b6fff19 | 1072 | gfn = unalias_gfn(kvm, gfn); |
2843099f | 1073 | memslot = gfn_to_memslot_unaliased(kvm, gfn); |
7e9d619d RR |
1074 | if (memslot && memslot->dirty_bitmap) { |
1075 | unsigned long rel_gfn = gfn - memslot->base_gfn; | |
6aa8b732 | 1076 | |
7e9d619d | 1077 | /* avoid RMW */ |
c8240bd6 AG |
1078 | if (!generic_test_le_bit(rel_gfn, memslot->dirty_bitmap)) |
1079 | generic___set_le_bit(rel_gfn, memslot->dirty_bitmap); | |
6aa8b732 AK |
1080 | } |
1081 | } | |
1082 | ||
b6958ce4 ED |
1083 | /* |
1084 | * The vCPU has executed a HLT instruction with in-kernel mode enabled. | |
1085 | */ | |
8776e519 | 1086 | void kvm_vcpu_block(struct kvm_vcpu *vcpu) |
d3bef15f | 1087 | { |
e5c239cf MT |
1088 | DEFINE_WAIT(wait); |
1089 | ||
1090 | for (;;) { | |
1091 | prepare_to_wait(&vcpu->wq, &wait, TASK_INTERRUPTIBLE); | |
1092 | ||
a1b37100 | 1093 | if (kvm_arch_vcpu_runnable(vcpu)) { |
d7690175 | 1094 | set_bit(KVM_REQ_UNHALT, &vcpu->requests); |
e5c239cf | 1095 | break; |
d7690175 | 1096 | } |
09cec754 GN |
1097 | if (kvm_cpu_has_pending_timer(vcpu)) |
1098 | break; | |
e5c239cf MT |
1099 | if (signal_pending(current)) |
1100 | break; | |
1101 | ||
b6958ce4 | 1102 | schedule(); |
b6958ce4 | 1103 | } |
d3bef15f | 1104 | |
e5c239cf | 1105 | finish_wait(&vcpu->wq, &wait); |
b6958ce4 ED |
1106 | } |
1107 | ||
6aa8b732 AK |
1108 | void kvm_resched(struct kvm_vcpu *vcpu) |
1109 | { | |
3fca0365 YD |
1110 | if (!need_resched()) |
1111 | return; | |
6aa8b732 | 1112 | cond_resched(); |
6aa8b732 AK |
1113 | } |
1114 | EXPORT_SYMBOL_GPL(kvm_resched); | |
1115 | ||
d255f4f2 ZE |
1116 | void kvm_vcpu_on_spin(struct kvm_vcpu *vcpu) |
1117 | { | |
1118 | ktime_t expires; | |
1119 | DEFINE_WAIT(wait); | |
1120 | ||
1121 | prepare_to_wait(&vcpu->wq, &wait, TASK_INTERRUPTIBLE); | |
1122 | ||
1123 | /* Sleep for 100 us, and hope lock-holder got scheduled */ | |
1124 | expires = ktime_add_ns(ktime_get(), 100000UL); | |
1125 | schedule_hrtimeout(&expires, HRTIMER_MODE_ABS); | |
1126 | ||
1127 | finish_wait(&vcpu->wq, &wait); | |
1128 | } | |
1129 | EXPORT_SYMBOL_GPL(kvm_vcpu_on_spin); | |
1130 | ||
e4a533a4 | 1131 | static int kvm_vcpu_fault(struct vm_area_struct *vma, struct vm_fault *vmf) |
9a2bb7f4 AK |
1132 | { |
1133 | struct kvm_vcpu *vcpu = vma->vm_file->private_data; | |
9a2bb7f4 AK |
1134 | struct page *page; |
1135 | ||
e4a533a4 | 1136 | if (vmf->pgoff == 0) |
039576c0 | 1137 | page = virt_to_page(vcpu->run); |
09566765 | 1138 | #ifdef CONFIG_X86 |
e4a533a4 | 1139 | else if (vmf->pgoff == KVM_PIO_PAGE_OFFSET) |
ad312c7c | 1140 | page = virt_to_page(vcpu->arch.pio_data); |
5f94c174 LV |
1141 | #endif |
1142 | #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET | |
1143 | else if (vmf->pgoff == KVM_COALESCED_MMIO_PAGE_OFFSET) | |
1144 | page = virt_to_page(vcpu->kvm->coalesced_mmio_ring); | |
09566765 | 1145 | #endif |
039576c0 | 1146 | else |
e4a533a4 | 1147 | return VM_FAULT_SIGBUS; |
9a2bb7f4 | 1148 | get_page(page); |
e4a533a4 | 1149 | vmf->page = page; |
1150 | return 0; | |
9a2bb7f4 AK |
1151 | } |
1152 | ||
f0f37e2f | 1153 | static const struct vm_operations_struct kvm_vcpu_vm_ops = { |
e4a533a4 | 1154 | .fault = kvm_vcpu_fault, |
9a2bb7f4 AK |
1155 | }; |
1156 | ||
1157 | static int kvm_vcpu_mmap(struct file *file, struct vm_area_struct *vma) | |
1158 | { | |
1159 | vma->vm_ops = &kvm_vcpu_vm_ops; | |
1160 | return 0; | |
1161 | } | |
1162 | ||
bccf2150 AK |
1163 | static int kvm_vcpu_release(struct inode *inode, struct file *filp) |
1164 | { | |
1165 | struct kvm_vcpu *vcpu = filp->private_data; | |
1166 | ||
66c0b394 | 1167 | kvm_put_kvm(vcpu->kvm); |
bccf2150 AK |
1168 | return 0; |
1169 | } | |
1170 | ||
3d3aab1b | 1171 | static struct file_operations kvm_vcpu_fops = { |
bccf2150 AK |
1172 | .release = kvm_vcpu_release, |
1173 | .unlocked_ioctl = kvm_vcpu_ioctl, | |
1174 | .compat_ioctl = kvm_vcpu_ioctl, | |
9a2bb7f4 | 1175 | .mmap = kvm_vcpu_mmap, |
bccf2150 AK |
1176 | }; |
1177 | ||
1178 | /* | |
1179 | * Allocates an inode for the vcpu. | |
1180 | */ | |
1181 | static int create_vcpu_fd(struct kvm_vcpu *vcpu) | |
1182 | { | |
628ff7c1 | 1183 | return anon_inode_getfd("kvm-vcpu", &kvm_vcpu_fops, vcpu, O_RDWR); |
bccf2150 AK |
1184 | } |
1185 | ||
c5ea7660 AK |
1186 | /* |
1187 | * Creates some virtual cpus. Good luck creating more than one. | |
1188 | */ | |
73880c80 | 1189 | static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, u32 id) |
c5ea7660 AK |
1190 | { |
1191 | int r; | |
988a2cae | 1192 | struct kvm_vcpu *vcpu, *v; |
c5ea7660 | 1193 | |
73880c80 | 1194 | vcpu = kvm_arch_vcpu_create(kvm, id); |
fb3f0f51 RR |
1195 | if (IS_ERR(vcpu)) |
1196 | return PTR_ERR(vcpu); | |
c5ea7660 | 1197 | |
15ad7146 AK |
1198 | preempt_notifier_init(&vcpu->preempt_notifier, &kvm_preempt_ops); |
1199 | ||
26e5215f AK |
1200 | r = kvm_arch_vcpu_setup(vcpu); |
1201 | if (r) | |
7d8fece6 | 1202 | return r; |
26e5215f | 1203 | |
11ec2804 | 1204 | mutex_lock(&kvm->lock); |
73880c80 GN |
1205 | if (atomic_read(&kvm->online_vcpus) == KVM_MAX_VCPUS) { |
1206 | r = -EINVAL; | |
e9b11c17 | 1207 | goto vcpu_destroy; |
fb3f0f51 | 1208 | } |
73880c80 | 1209 | |
988a2cae GN |
1210 | kvm_for_each_vcpu(r, v, kvm) |
1211 | if (v->vcpu_id == id) { | |
73880c80 GN |
1212 | r = -EEXIST; |
1213 | goto vcpu_destroy; | |
1214 | } | |
1215 | ||
1216 | BUG_ON(kvm->vcpus[atomic_read(&kvm->online_vcpus)]); | |
c5ea7660 | 1217 | |
fb3f0f51 | 1218 | /* Now it's all set up, let userspace reach it */ |
66c0b394 | 1219 | kvm_get_kvm(kvm); |
bccf2150 | 1220 | r = create_vcpu_fd(vcpu); |
73880c80 GN |
1221 | if (r < 0) { |
1222 | kvm_put_kvm(kvm); | |
1223 | goto vcpu_destroy; | |
1224 | } | |
1225 | ||
1226 | kvm->vcpus[atomic_read(&kvm->online_vcpus)] = vcpu; | |
1227 | smp_wmb(); | |
1228 | atomic_inc(&kvm->online_vcpus); | |
1229 | ||
1230 | #ifdef CONFIG_KVM_APIC_ARCHITECTURE | |
1231 | if (kvm->bsp_vcpu_id == id) | |
1232 | kvm->bsp_vcpu = vcpu; | |
1233 | #endif | |
1234 | mutex_unlock(&kvm->lock); | |
fb3f0f51 | 1235 | return r; |
39c3b86e | 1236 | |
e9b11c17 | 1237 | vcpu_destroy: |
7d8fece6 | 1238 | mutex_unlock(&kvm->lock); |
d40ccc62 | 1239 | kvm_arch_vcpu_destroy(vcpu); |
c5ea7660 AK |
1240 | return r; |
1241 | } | |
1242 | ||
1961d276 AK |
1243 | static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu *vcpu, sigset_t *sigset) |
1244 | { | |
1245 | if (sigset) { | |
1246 | sigdelsetmask(sigset, sigmask(SIGKILL)|sigmask(SIGSTOP)); | |
1247 | vcpu->sigset_active = 1; | |
1248 | vcpu->sigset = *sigset; | |
1249 | } else | |
1250 | vcpu->sigset_active = 0; | |
1251 | return 0; | |
1252 | } | |
1253 | ||
bccf2150 AK |
1254 | static long kvm_vcpu_ioctl(struct file *filp, |
1255 | unsigned int ioctl, unsigned long arg) | |
6aa8b732 | 1256 | { |
bccf2150 | 1257 | struct kvm_vcpu *vcpu = filp->private_data; |
2f366987 | 1258 | void __user *argp = (void __user *)arg; |
313a3dc7 | 1259 | int r; |
fa3795a7 DH |
1260 | struct kvm_fpu *fpu = NULL; |
1261 | struct kvm_sregs *kvm_sregs = NULL; | |
6aa8b732 | 1262 | |
6d4e4c4f AK |
1263 | if (vcpu->kvm->mm != current->mm) |
1264 | return -EIO; | |
6aa8b732 | 1265 | switch (ioctl) { |
9a2bb7f4 | 1266 | case KVM_RUN: |
f0fe5108 AK |
1267 | r = -EINVAL; |
1268 | if (arg) | |
1269 | goto out; | |
b6c7a5dc | 1270 | r = kvm_arch_vcpu_ioctl_run(vcpu, vcpu->run); |
6aa8b732 | 1271 | break; |
6aa8b732 | 1272 | case KVM_GET_REGS: { |
3e4bb3ac | 1273 | struct kvm_regs *kvm_regs; |
6aa8b732 | 1274 | |
3e4bb3ac XZ |
1275 | r = -ENOMEM; |
1276 | kvm_regs = kzalloc(sizeof(struct kvm_regs), GFP_KERNEL); | |
1277 | if (!kvm_regs) | |
6aa8b732 | 1278 | goto out; |
3e4bb3ac XZ |
1279 | r = kvm_arch_vcpu_ioctl_get_regs(vcpu, kvm_regs); |
1280 | if (r) | |
1281 | goto out_free1; | |
6aa8b732 | 1282 | r = -EFAULT; |
3e4bb3ac XZ |
1283 | if (copy_to_user(argp, kvm_regs, sizeof(struct kvm_regs))) |
1284 | goto out_free1; | |
6aa8b732 | 1285 | r = 0; |
3e4bb3ac XZ |
1286 | out_free1: |
1287 | kfree(kvm_regs); | |
6aa8b732 AK |
1288 | break; |
1289 | } | |
1290 | case KVM_SET_REGS: { | |
3e4bb3ac | 1291 | struct kvm_regs *kvm_regs; |
6aa8b732 | 1292 | |
3e4bb3ac XZ |
1293 | r = -ENOMEM; |
1294 | kvm_regs = kzalloc(sizeof(struct kvm_regs), GFP_KERNEL); | |
1295 | if (!kvm_regs) | |
6aa8b732 | 1296 | goto out; |
3e4bb3ac XZ |
1297 | r = -EFAULT; |
1298 | if (copy_from_user(kvm_regs, argp, sizeof(struct kvm_regs))) | |
1299 | goto out_free2; | |
1300 | r = kvm_arch_vcpu_ioctl_set_regs(vcpu, kvm_regs); | |
6aa8b732 | 1301 | if (r) |
3e4bb3ac | 1302 | goto out_free2; |
6aa8b732 | 1303 | r = 0; |
3e4bb3ac XZ |
1304 | out_free2: |
1305 | kfree(kvm_regs); | |
6aa8b732 AK |
1306 | break; |
1307 | } | |
1308 | case KVM_GET_SREGS: { | |
fa3795a7 DH |
1309 | kvm_sregs = kzalloc(sizeof(struct kvm_sregs), GFP_KERNEL); |
1310 | r = -ENOMEM; | |
1311 | if (!kvm_sregs) | |
1312 | goto out; | |
1313 | r = kvm_arch_vcpu_ioctl_get_sregs(vcpu, kvm_sregs); | |
6aa8b732 AK |
1314 | if (r) |
1315 | goto out; | |
1316 | r = -EFAULT; | |
fa3795a7 | 1317 | if (copy_to_user(argp, kvm_sregs, sizeof(struct kvm_sregs))) |
6aa8b732 AK |
1318 | goto out; |
1319 | r = 0; | |
1320 | break; | |
1321 | } | |
1322 | case KVM_SET_SREGS: { | |
fa3795a7 DH |
1323 | kvm_sregs = kmalloc(sizeof(struct kvm_sregs), GFP_KERNEL); |
1324 | r = -ENOMEM; | |
1325 | if (!kvm_sregs) | |
1326 | goto out; | |
6aa8b732 | 1327 | r = -EFAULT; |
fa3795a7 | 1328 | if (copy_from_user(kvm_sregs, argp, sizeof(struct kvm_sregs))) |
6aa8b732 | 1329 | goto out; |
fa3795a7 | 1330 | r = kvm_arch_vcpu_ioctl_set_sregs(vcpu, kvm_sregs); |
6aa8b732 AK |
1331 | if (r) |
1332 | goto out; | |
1333 | r = 0; | |
1334 | break; | |
1335 | } | |
62d9f0db MT |
1336 | case KVM_GET_MP_STATE: { |
1337 | struct kvm_mp_state mp_state; | |
1338 | ||
1339 | r = kvm_arch_vcpu_ioctl_get_mpstate(vcpu, &mp_state); | |
1340 | if (r) | |
1341 | goto out; | |
1342 | r = -EFAULT; | |
1343 | if (copy_to_user(argp, &mp_state, sizeof mp_state)) | |
1344 | goto out; | |
1345 | r = 0; | |
1346 | break; | |
1347 | } | |
1348 | case KVM_SET_MP_STATE: { | |
1349 | struct kvm_mp_state mp_state; | |
1350 | ||
1351 | r = -EFAULT; | |
1352 | if (copy_from_user(&mp_state, argp, sizeof mp_state)) | |
1353 | goto out; | |
1354 | r = kvm_arch_vcpu_ioctl_set_mpstate(vcpu, &mp_state); | |
1355 | if (r) | |
1356 | goto out; | |
1357 | r = 0; | |
1358 | break; | |
1359 | } | |
6aa8b732 AK |
1360 | case KVM_TRANSLATE: { |
1361 | struct kvm_translation tr; | |
1362 | ||
1363 | r = -EFAULT; | |
2f366987 | 1364 | if (copy_from_user(&tr, argp, sizeof tr)) |
6aa8b732 | 1365 | goto out; |
8b006791 | 1366 | r = kvm_arch_vcpu_ioctl_translate(vcpu, &tr); |
6aa8b732 AK |
1367 | if (r) |
1368 | goto out; | |
1369 | r = -EFAULT; | |
2f366987 | 1370 | if (copy_to_user(argp, &tr, sizeof tr)) |
6aa8b732 AK |
1371 | goto out; |
1372 | r = 0; | |
1373 | break; | |
1374 | } | |
d0bfb940 JK |
1375 | case KVM_SET_GUEST_DEBUG: { |
1376 | struct kvm_guest_debug dbg; | |
6aa8b732 AK |
1377 | |
1378 | r = -EFAULT; | |
2f366987 | 1379 | if (copy_from_user(&dbg, argp, sizeof dbg)) |
6aa8b732 | 1380 | goto out; |
d0bfb940 | 1381 | r = kvm_arch_vcpu_ioctl_set_guest_debug(vcpu, &dbg); |
6aa8b732 AK |
1382 | if (r) |
1383 | goto out; | |
1384 | r = 0; | |
1385 | break; | |
1386 | } | |
1961d276 AK |
1387 | case KVM_SET_SIGNAL_MASK: { |
1388 | struct kvm_signal_mask __user *sigmask_arg = argp; | |
1389 | struct kvm_signal_mask kvm_sigmask; | |
1390 | sigset_t sigset, *p; | |
1391 | ||
1392 | p = NULL; | |
1393 | if (argp) { | |
1394 | r = -EFAULT; | |
1395 | if (copy_from_user(&kvm_sigmask, argp, | |
1396 | sizeof kvm_sigmask)) | |
1397 | goto out; | |
1398 | r = -EINVAL; | |
1399 | if (kvm_sigmask.len != sizeof sigset) | |
1400 | goto out; | |
1401 | r = -EFAULT; | |
1402 | if (copy_from_user(&sigset, sigmask_arg->sigset, | |
1403 | sizeof sigset)) | |
1404 | goto out; | |
1405 | p = &sigset; | |
1406 | } | |
1407 | r = kvm_vcpu_ioctl_set_sigmask(vcpu, &sigset); | |
1408 | break; | |
1409 | } | |
b8836737 | 1410 | case KVM_GET_FPU: { |
fa3795a7 DH |
1411 | fpu = kzalloc(sizeof(struct kvm_fpu), GFP_KERNEL); |
1412 | r = -ENOMEM; | |
1413 | if (!fpu) | |
1414 | goto out; | |
1415 | r = kvm_arch_vcpu_ioctl_get_fpu(vcpu, fpu); | |
b8836737 AK |
1416 | if (r) |
1417 | goto out; | |
1418 | r = -EFAULT; | |
fa3795a7 | 1419 | if (copy_to_user(argp, fpu, sizeof(struct kvm_fpu))) |
b8836737 AK |
1420 | goto out; |
1421 | r = 0; | |
1422 | break; | |
1423 | } | |
1424 | case KVM_SET_FPU: { | |
fa3795a7 DH |
1425 | fpu = kmalloc(sizeof(struct kvm_fpu), GFP_KERNEL); |
1426 | r = -ENOMEM; | |
1427 | if (!fpu) | |
1428 | goto out; | |
b8836737 | 1429 | r = -EFAULT; |
fa3795a7 | 1430 | if (copy_from_user(fpu, argp, sizeof(struct kvm_fpu))) |
b8836737 | 1431 | goto out; |
fa3795a7 | 1432 | r = kvm_arch_vcpu_ioctl_set_fpu(vcpu, fpu); |
b8836737 AK |
1433 | if (r) |
1434 | goto out; | |
1435 | r = 0; | |
1436 | break; | |
1437 | } | |
bccf2150 | 1438 | default: |
313a3dc7 | 1439 | r = kvm_arch_vcpu_ioctl(filp, ioctl, arg); |
bccf2150 AK |
1440 | } |
1441 | out: | |
fa3795a7 DH |
1442 | kfree(fpu); |
1443 | kfree(kvm_sregs); | |
bccf2150 AK |
1444 | return r; |
1445 | } | |
1446 | ||
1447 | static long kvm_vm_ioctl(struct file *filp, | |
1448 | unsigned int ioctl, unsigned long arg) | |
1449 | { | |
1450 | struct kvm *kvm = filp->private_data; | |
1451 | void __user *argp = (void __user *)arg; | |
1fe779f8 | 1452 | int r; |
bccf2150 | 1453 | |
6d4e4c4f AK |
1454 | if (kvm->mm != current->mm) |
1455 | return -EIO; | |
bccf2150 AK |
1456 | switch (ioctl) { |
1457 | case KVM_CREATE_VCPU: | |
1458 | r = kvm_vm_ioctl_create_vcpu(kvm, arg); | |
1459 | if (r < 0) | |
1460 | goto out; | |
1461 | break; | |
6fc138d2 IE |
1462 | case KVM_SET_USER_MEMORY_REGION: { |
1463 | struct kvm_userspace_memory_region kvm_userspace_mem; | |
1464 | ||
1465 | r = -EFAULT; | |
1466 | if (copy_from_user(&kvm_userspace_mem, argp, | |
1467 | sizeof kvm_userspace_mem)) | |
1468 | goto out; | |
1469 | ||
1470 | r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_userspace_mem, 1); | |
6aa8b732 AK |
1471 | if (r) |
1472 | goto out; | |
1473 | break; | |
1474 | } | |
1475 | case KVM_GET_DIRTY_LOG: { | |
1476 | struct kvm_dirty_log log; | |
1477 | ||
1478 | r = -EFAULT; | |
2f366987 | 1479 | if (copy_from_user(&log, argp, sizeof log)) |
6aa8b732 | 1480 | goto out; |
2c6f5df9 | 1481 | r = kvm_vm_ioctl_get_dirty_log(kvm, &log); |
6aa8b732 AK |
1482 | if (r) |
1483 | goto out; | |
1484 | break; | |
1485 | } | |
5f94c174 LV |
1486 | #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET |
1487 | case KVM_REGISTER_COALESCED_MMIO: { | |
1488 | struct kvm_coalesced_mmio_zone zone; | |
1489 | r = -EFAULT; | |
1490 | if (copy_from_user(&zone, argp, sizeof zone)) | |
1491 | goto out; | |
1492 | r = -ENXIO; | |
1493 | r = kvm_vm_ioctl_register_coalesced_mmio(kvm, &zone); | |
1494 | if (r) | |
1495 | goto out; | |
1496 | r = 0; | |
1497 | break; | |
1498 | } | |
1499 | case KVM_UNREGISTER_COALESCED_MMIO: { | |
1500 | struct kvm_coalesced_mmio_zone zone; | |
1501 | r = -EFAULT; | |
1502 | if (copy_from_user(&zone, argp, sizeof zone)) | |
1503 | goto out; | |
1504 | r = -ENXIO; | |
1505 | r = kvm_vm_ioctl_unregister_coalesced_mmio(kvm, &zone); | |
1506 | if (r) | |
1507 | goto out; | |
1508 | r = 0; | |
1509 | break; | |
1510 | } | |
1511 | #endif | |
721eecbf GH |
1512 | case KVM_IRQFD: { |
1513 | struct kvm_irqfd data; | |
1514 | ||
1515 | r = -EFAULT; | |
1516 | if (copy_from_user(&data, argp, sizeof data)) | |
1517 | goto out; | |
1518 | r = kvm_irqfd(kvm, data.fd, data.gsi, data.flags); | |
1519 | break; | |
1520 | } | |
d34e6b17 GH |
1521 | case KVM_IOEVENTFD: { |
1522 | struct kvm_ioeventfd data; | |
1523 | ||
1524 | r = -EFAULT; | |
1525 | if (copy_from_user(&data, argp, sizeof data)) | |
1526 | goto out; | |
1527 | r = kvm_ioeventfd(kvm, &data); | |
1528 | break; | |
1529 | } | |
73880c80 GN |
1530 | #ifdef CONFIG_KVM_APIC_ARCHITECTURE |
1531 | case KVM_SET_BOOT_CPU_ID: | |
1532 | r = 0; | |
894a9c55 | 1533 | mutex_lock(&kvm->lock); |
73880c80 GN |
1534 | if (atomic_read(&kvm->online_vcpus) != 0) |
1535 | r = -EBUSY; | |
1536 | else | |
1537 | kvm->bsp_vcpu_id = arg; | |
894a9c55 | 1538 | mutex_unlock(&kvm->lock); |
73880c80 GN |
1539 | break; |
1540 | #endif | |
f17abe9a | 1541 | default: |
1fe779f8 | 1542 | r = kvm_arch_vm_ioctl(filp, ioctl, arg); |
bfd99ff5 AK |
1543 | if (r == -ENOTTY) |
1544 | r = kvm_vm_ioctl_assigned_device(kvm, ioctl, arg); | |
f17abe9a AK |
1545 | } |
1546 | out: | |
1547 | return r; | |
1548 | } | |
1549 | ||
6ff5894c AB |
1550 | #ifdef CONFIG_COMPAT |
1551 | struct compat_kvm_dirty_log { | |
1552 | __u32 slot; | |
1553 | __u32 padding1; | |
1554 | union { | |
1555 | compat_uptr_t dirty_bitmap; /* one bit per page */ | |
1556 | __u64 padding2; | |
1557 | }; | |
1558 | }; | |
1559 | ||
1560 | static long kvm_vm_compat_ioctl(struct file *filp, | |
1561 | unsigned int ioctl, unsigned long arg) | |
1562 | { | |
1563 | struct kvm *kvm = filp->private_data; | |
1564 | int r; | |
1565 | ||
1566 | if (kvm->mm != current->mm) | |
1567 | return -EIO; | |
1568 | switch (ioctl) { | |
1569 | case KVM_GET_DIRTY_LOG: { | |
1570 | struct compat_kvm_dirty_log compat_log; | |
1571 | struct kvm_dirty_log log; | |
1572 | ||
1573 | r = -EFAULT; | |
1574 | if (copy_from_user(&compat_log, (void __user *)arg, | |
1575 | sizeof(compat_log))) | |
1576 | goto out; | |
1577 | log.slot = compat_log.slot; | |
1578 | log.padding1 = compat_log.padding1; | |
1579 | log.padding2 = compat_log.padding2; | |
1580 | log.dirty_bitmap = compat_ptr(compat_log.dirty_bitmap); | |
1581 | ||
1582 | r = kvm_vm_ioctl_get_dirty_log(kvm, &log); | |
1583 | if (r) | |
1584 | goto out; | |
1585 | break; | |
1586 | } | |
1587 | default: | |
1588 | r = kvm_vm_ioctl(filp, ioctl, arg); | |
1589 | } | |
1590 | ||
1591 | out: | |
1592 | return r; | |
1593 | } | |
1594 | #endif | |
1595 | ||
e4a533a4 | 1596 | static int kvm_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf) |
f17abe9a | 1597 | { |
777b3f49 MT |
1598 | struct page *page[1]; |
1599 | unsigned long addr; | |
1600 | int npages; | |
1601 | gfn_t gfn = vmf->pgoff; | |
f17abe9a | 1602 | struct kvm *kvm = vma->vm_file->private_data; |
f17abe9a | 1603 | |
777b3f49 MT |
1604 | addr = gfn_to_hva(kvm, gfn); |
1605 | if (kvm_is_error_hva(addr)) | |
e4a533a4 | 1606 | return VM_FAULT_SIGBUS; |
777b3f49 MT |
1607 | |
1608 | npages = get_user_pages(current, current->mm, addr, 1, 1, 0, page, | |
1609 | NULL); | |
1610 | if (unlikely(npages != 1)) | |
e4a533a4 | 1611 | return VM_FAULT_SIGBUS; |
777b3f49 MT |
1612 | |
1613 | vmf->page = page[0]; | |
e4a533a4 | 1614 | return 0; |
f17abe9a AK |
1615 | } |
1616 | ||
f0f37e2f | 1617 | static const struct vm_operations_struct kvm_vm_vm_ops = { |
e4a533a4 | 1618 | .fault = kvm_vm_fault, |
f17abe9a AK |
1619 | }; |
1620 | ||
1621 | static int kvm_vm_mmap(struct file *file, struct vm_area_struct *vma) | |
1622 | { | |
1623 | vma->vm_ops = &kvm_vm_vm_ops; | |
1624 | return 0; | |
1625 | } | |
1626 | ||
3d3aab1b | 1627 | static struct file_operations kvm_vm_fops = { |
f17abe9a AK |
1628 | .release = kvm_vm_release, |
1629 | .unlocked_ioctl = kvm_vm_ioctl, | |
6ff5894c AB |
1630 | #ifdef CONFIG_COMPAT |
1631 | .compat_ioctl = kvm_vm_compat_ioctl, | |
1632 | #endif | |
f17abe9a AK |
1633 | .mmap = kvm_vm_mmap, |
1634 | }; | |
1635 | ||
1636 | static int kvm_dev_ioctl_create_vm(void) | |
1637 | { | |
2030a42c | 1638 | int fd; |
f17abe9a AK |
1639 | struct kvm *kvm; |
1640 | ||
f17abe9a | 1641 | kvm = kvm_create_vm(); |
d6d28168 AK |
1642 | if (IS_ERR(kvm)) |
1643 | return PTR_ERR(kvm); | |
628ff7c1 | 1644 | fd = anon_inode_getfd("kvm-vm", &kvm_vm_fops, kvm, O_RDWR); |
2030a42c | 1645 | if (fd < 0) |
66c0b394 | 1646 | kvm_put_kvm(kvm); |
f17abe9a | 1647 | |
f17abe9a | 1648 | return fd; |
f17abe9a AK |
1649 | } |
1650 | ||
1a811b61 AK |
1651 | static long kvm_dev_ioctl_check_extension_generic(long arg) |
1652 | { | |
1653 | switch (arg) { | |
ca9edaee | 1654 | case KVM_CAP_USER_MEMORY: |
1a811b61 | 1655 | case KVM_CAP_DESTROY_MEMORY_REGION_WORKS: |
4cd481f6 | 1656 | case KVM_CAP_JOIN_MEMORY_REGIONS_WORKS: |
73880c80 GN |
1657 | #ifdef CONFIG_KVM_APIC_ARCHITECTURE |
1658 | case KVM_CAP_SET_BOOT_CPU_ID: | |
1659 | #endif | |
a9c7399d | 1660 | case KVM_CAP_INTERNAL_ERROR_DATA: |
1a811b61 | 1661 | return 1; |
399ec807 AK |
1662 | #ifdef CONFIG_HAVE_KVM_IRQCHIP |
1663 | case KVM_CAP_IRQ_ROUTING: | |
36463146 | 1664 | return KVM_MAX_IRQ_ROUTES; |
399ec807 | 1665 | #endif |
1a811b61 AK |
1666 | default: |
1667 | break; | |
1668 | } | |
1669 | return kvm_dev_ioctl_check_extension(arg); | |
1670 | } | |
1671 | ||
f17abe9a AK |
1672 | static long kvm_dev_ioctl(struct file *filp, |
1673 | unsigned int ioctl, unsigned long arg) | |
1674 | { | |
07c45a36 | 1675 | long r = -EINVAL; |
f17abe9a AK |
1676 | |
1677 | switch (ioctl) { | |
1678 | case KVM_GET_API_VERSION: | |
f0fe5108 AK |
1679 | r = -EINVAL; |
1680 | if (arg) | |
1681 | goto out; | |
f17abe9a AK |
1682 | r = KVM_API_VERSION; |
1683 | break; | |
1684 | case KVM_CREATE_VM: | |
f0fe5108 AK |
1685 | r = -EINVAL; |
1686 | if (arg) | |
1687 | goto out; | |
f17abe9a AK |
1688 | r = kvm_dev_ioctl_create_vm(); |
1689 | break; | |
018d00d2 | 1690 | case KVM_CHECK_EXTENSION: |
1a811b61 | 1691 | r = kvm_dev_ioctl_check_extension_generic(arg); |
5d308f45 | 1692 | break; |
07c45a36 AK |
1693 | case KVM_GET_VCPU_MMAP_SIZE: |
1694 | r = -EINVAL; | |
1695 | if (arg) | |
1696 | goto out; | |
adb1ff46 AK |
1697 | r = PAGE_SIZE; /* struct kvm_run */ |
1698 | #ifdef CONFIG_X86 | |
1699 | r += PAGE_SIZE; /* pio data page */ | |
5f94c174 LV |
1700 | #endif |
1701 | #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET | |
1702 | r += PAGE_SIZE; /* coalesced mmio ring page */ | |
adb1ff46 | 1703 | #endif |
07c45a36 | 1704 | break; |
d4c9ff2d FEL |
1705 | case KVM_TRACE_ENABLE: |
1706 | case KVM_TRACE_PAUSE: | |
1707 | case KVM_TRACE_DISABLE: | |
2023a29c | 1708 | r = -EOPNOTSUPP; |
d4c9ff2d | 1709 | break; |
6aa8b732 | 1710 | default: |
043405e1 | 1711 | return kvm_arch_dev_ioctl(filp, ioctl, arg); |
6aa8b732 AK |
1712 | } |
1713 | out: | |
1714 | return r; | |
1715 | } | |
1716 | ||
6aa8b732 | 1717 | static struct file_operations kvm_chardev_ops = { |
6aa8b732 AK |
1718 | .unlocked_ioctl = kvm_dev_ioctl, |
1719 | .compat_ioctl = kvm_dev_ioctl, | |
6aa8b732 AK |
1720 | }; |
1721 | ||
1722 | static struct miscdevice kvm_dev = { | |
bbe4432e | 1723 | KVM_MINOR, |
6aa8b732 AK |
1724 | "kvm", |
1725 | &kvm_chardev_ops, | |
1726 | }; | |
1727 | ||
1b6c0168 AK |
1728 | static void hardware_enable(void *junk) |
1729 | { | |
1730 | int cpu = raw_smp_processor_id(); | |
10474ae8 | 1731 | int r; |
1b6c0168 | 1732 | |
7f59f492 | 1733 | if (cpumask_test_cpu(cpu, cpus_hardware_enabled)) |
1b6c0168 | 1734 | return; |
10474ae8 | 1735 | |
7f59f492 | 1736 | cpumask_set_cpu(cpu, cpus_hardware_enabled); |
10474ae8 AG |
1737 | |
1738 | r = kvm_arch_hardware_enable(NULL); | |
1739 | ||
1740 | if (r) { | |
1741 | cpumask_clear_cpu(cpu, cpus_hardware_enabled); | |
1742 | atomic_inc(&hardware_enable_failed); | |
1743 | printk(KERN_INFO "kvm: enabling virtualization on " | |
1744 | "CPU%d failed\n", cpu); | |
1745 | } | |
1b6c0168 AK |
1746 | } |
1747 | ||
1748 | static void hardware_disable(void *junk) | |
1749 | { | |
1750 | int cpu = raw_smp_processor_id(); | |
1751 | ||
7f59f492 | 1752 | if (!cpumask_test_cpu(cpu, cpus_hardware_enabled)) |
1b6c0168 | 1753 | return; |
7f59f492 | 1754 | cpumask_clear_cpu(cpu, cpus_hardware_enabled); |
e9b11c17 | 1755 | kvm_arch_hardware_disable(NULL); |
1b6c0168 AK |
1756 | } |
1757 | ||
10474ae8 AG |
1758 | static void hardware_disable_all_nolock(void) |
1759 | { | |
1760 | BUG_ON(!kvm_usage_count); | |
1761 | ||
1762 | kvm_usage_count--; | |
1763 | if (!kvm_usage_count) | |
1764 | on_each_cpu(hardware_disable, NULL, 1); | |
1765 | } | |
1766 | ||
1767 | static void hardware_disable_all(void) | |
1768 | { | |
1769 | spin_lock(&kvm_lock); | |
1770 | hardware_disable_all_nolock(); | |
1771 | spin_unlock(&kvm_lock); | |
1772 | } | |
1773 | ||
1774 | static int hardware_enable_all(void) | |
1775 | { | |
1776 | int r = 0; | |
1777 | ||
1778 | spin_lock(&kvm_lock); | |
1779 | ||
1780 | kvm_usage_count++; | |
1781 | if (kvm_usage_count == 1) { | |
1782 | atomic_set(&hardware_enable_failed, 0); | |
1783 | on_each_cpu(hardware_enable, NULL, 1); | |
1784 | ||
1785 | if (atomic_read(&hardware_enable_failed)) { | |
1786 | hardware_disable_all_nolock(); | |
1787 | r = -EBUSY; | |
1788 | } | |
1789 | } | |
1790 | ||
1791 | spin_unlock(&kvm_lock); | |
1792 | ||
1793 | return r; | |
1794 | } | |
1795 | ||
774c47f1 AK |
1796 | static int kvm_cpu_hotplug(struct notifier_block *notifier, unsigned long val, |
1797 | void *v) | |
1798 | { | |
1799 | int cpu = (long)v; | |
1800 | ||
10474ae8 AG |
1801 | if (!kvm_usage_count) |
1802 | return NOTIFY_OK; | |
1803 | ||
1a6f4d7f | 1804 | val &= ~CPU_TASKS_FROZEN; |
774c47f1 | 1805 | switch (val) { |
cec9ad27 | 1806 | case CPU_DYING: |
6ec8a856 AK |
1807 | printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n", |
1808 | cpu); | |
1809 | hardware_disable(NULL); | |
1810 | break; | |
774c47f1 | 1811 | case CPU_UP_CANCELED: |
43934a38 JK |
1812 | printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n", |
1813 | cpu); | |
8691e5a8 | 1814 | smp_call_function_single(cpu, hardware_disable, NULL, 1); |
774c47f1 | 1815 | break; |
43934a38 JK |
1816 | case CPU_ONLINE: |
1817 | printk(KERN_INFO "kvm: enabling virtualization on CPU%d\n", | |
1818 | cpu); | |
8691e5a8 | 1819 | smp_call_function_single(cpu, hardware_enable, NULL, 1); |
774c47f1 AK |
1820 | break; |
1821 | } | |
1822 | return NOTIFY_OK; | |
1823 | } | |
1824 | ||
4ecac3fd AK |
1825 | |
1826 | asmlinkage void kvm_handle_fault_on_reboot(void) | |
1827 | { | |
1828 | if (kvm_rebooting) | |
1829 | /* spin while reset goes on */ | |
1830 | while (true) | |
1831 | ; | |
1832 | /* Fault while not rebooting. We want the trace. */ | |
1833 | BUG(); | |
1834 | } | |
1835 | EXPORT_SYMBOL_GPL(kvm_handle_fault_on_reboot); | |
1836 | ||
9a2b85c6 | 1837 | static int kvm_reboot(struct notifier_block *notifier, unsigned long val, |
d77c26fc | 1838 | void *v) |
9a2b85c6 | 1839 | { |
8e1c1815 SY |
1840 | /* |
1841 | * Some (well, at least mine) BIOSes hang on reboot if | |
1842 | * in vmx root mode. | |
1843 | * | |
1844 | * And Intel TXT required VMX off for all cpu when system shutdown. | |
1845 | */ | |
1846 | printk(KERN_INFO "kvm: exiting hardware virtualization\n"); | |
1847 | kvm_rebooting = true; | |
1848 | on_each_cpu(hardware_disable, NULL, 1); | |
9a2b85c6 RR |
1849 | return NOTIFY_OK; |
1850 | } | |
1851 | ||
1852 | static struct notifier_block kvm_reboot_notifier = { | |
1853 | .notifier_call = kvm_reboot, | |
1854 | .priority = 0, | |
1855 | }; | |
1856 | ||
2eeb2e94 GH |
1857 | void kvm_io_bus_init(struct kvm_io_bus *bus) |
1858 | { | |
1859 | memset(bus, 0, sizeof(*bus)); | |
1860 | } | |
1861 | ||
1862 | void kvm_io_bus_destroy(struct kvm_io_bus *bus) | |
1863 | { | |
1864 | int i; | |
1865 | ||
1866 | for (i = 0; i < bus->dev_count; i++) { | |
1867 | struct kvm_io_device *pos = bus->devs[i]; | |
1868 | ||
1869 | kvm_iodevice_destructor(pos); | |
1870 | } | |
1871 | } | |
1872 | ||
bda9020e MT |
1873 | /* kvm_io_bus_write - called under kvm->slots_lock */ |
1874 | int kvm_io_bus_write(struct kvm_io_bus *bus, gpa_t addr, | |
1875 | int len, const void *val) | |
2eeb2e94 GH |
1876 | { |
1877 | int i; | |
bda9020e MT |
1878 | for (i = 0; i < bus->dev_count; i++) |
1879 | if (!kvm_iodevice_write(bus->devs[i], addr, len, val)) | |
1880 | return 0; | |
1881 | return -EOPNOTSUPP; | |
1882 | } | |
2eeb2e94 | 1883 | |
bda9020e MT |
1884 | /* kvm_io_bus_read - called under kvm->slots_lock */ |
1885 | int kvm_io_bus_read(struct kvm_io_bus *bus, gpa_t addr, int len, void *val) | |
1886 | { | |
1887 | int i; | |
1888 | for (i = 0; i < bus->dev_count; i++) | |
1889 | if (!kvm_iodevice_read(bus->devs[i], addr, len, val)) | |
1890 | return 0; | |
1891 | return -EOPNOTSUPP; | |
2eeb2e94 GH |
1892 | } |
1893 | ||
090b7aff | 1894 | int kvm_io_bus_register_dev(struct kvm *kvm, struct kvm_io_bus *bus, |
6c474694 MT |
1895 | struct kvm_io_device *dev) |
1896 | { | |
090b7aff GH |
1897 | int ret; |
1898 | ||
6c474694 | 1899 | down_write(&kvm->slots_lock); |
090b7aff | 1900 | ret = __kvm_io_bus_register_dev(bus, dev); |
6c474694 | 1901 | up_write(&kvm->slots_lock); |
090b7aff GH |
1902 | |
1903 | return ret; | |
6c474694 MT |
1904 | } |
1905 | ||
1906 | /* An unlocked version. Caller must have write lock on slots_lock. */ | |
090b7aff GH |
1907 | int __kvm_io_bus_register_dev(struct kvm_io_bus *bus, |
1908 | struct kvm_io_device *dev) | |
2eeb2e94 | 1909 | { |
090b7aff GH |
1910 | if (bus->dev_count > NR_IOBUS_DEVS-1) |
1911 | return -ENOSPC; | |
2eeb2e94 GH |
1912 | |
1913 | bus->devs[bus->dev_count++] = dev; | |
090b7aff GH |
1914 | |
1915 | return 0; | |
1916 | } | |
1917 | ||
1918 | void kvm_io_bus_unregister_dev(struct kvm *kvm, | |
1919 | struct kvm_io_bus *bus, | |
1920 | struct kvm_io_device *dev) | |
1921 | { | |
1922 | down_write(&kvm->slots_lock); | |
1923 | __kvm_io_bus_unregister_dev(bus, dev); | |
1924 | up_write(&kvm->slots_lock); | |
1925 | } | |
1926 | ||
1927 | /* An unlocked version. Caller must have write lock on slots_lock. */ | |
1928 | void __kvm_io_bus_unregister_dev(struct kvm_io_bus *bus, | |
1929 | struct kvm_io_device *dev) | |
1930 | { | |
1931 | int i; | |
1932 | ||
1933 | for (i = 0; i < bus->dev_count; i++) | |
1934 | if (bus->devs[i] == dev) { | |
1935 | bus->devs[i] = bus->devs[--bus->dev_count]; | |
1936 | break; | |
1937 | } | |
2eeb2e94 GH |
1938 | } |
1939 | ||
774c47f1 AK |
1940 | static struct notifier_block kvm_cpu_notifier = { |
1941 | .notifier_call = kvm_cpu_hotplug, | |
1942 | .priority = 20, /* must be > scheduler priority */ | |
1943 | }; | |
1944 | ||
8b88b099 | 1945 | static int vm_stat_get(void *_offset, u64 *val) |
ba1389b7 AK |
1946 | { |
1947 | unsigned offset = (long)_offset; | |
ba1389b7 AK |
1948 | struct kvm *kvm; |
1949 | ||
8b88b099 | 1950 | *val = 0; |
ba1389b7 AK |
1951 | spin_lock(&kvm_lock); |
1952 | list_for_each_entry(kvm, &vm_list, vm_list) | |
8b88b099 | 1953 | *val += *(u32 *)((void *)kvm + offset); |
ba1389b7 | 1954 | spin_unlock(&kvm_lock); |
8b88b099 | 1955 | return 0; |
ba1389b7 AK |
1956 | } |
1957 | ||
1958 | DEFINE_SIMPLE_ATTRIBUTE(vm_stat_fops, vm_stat_get, NULL, "%llu\n"); | |
1959 | ||
8b88b099 | 1960 | static int vcpu_stat_get(void *_offset, u64 *val) |
1165f5fe AK |
1961 | { |
1962 | unsigned offset = (long)_offset; | |
1165f5fe AK |
1963 | struct kvm *kvm; |
1964 | struct kvm_vcpu *vcpu; | |
1965 | int i; | |
1966 | ||
8b88b099 | 1967 | *val = 0; |
1165f5fe AK |
1968 | spin_lock(&kvm_lock); |
1969 | list_for_each_entry(kvm, &vm_list, vm_list) | |
988a2cae GN |
1970 | kvm_for_each_vcpu(i, vcpu, kvm) |
1971 | *val += *(u32 *)((void *)vcpu + offset); | |
1972 | ||
1165f5fe | 1973 | spin_unlock(&kvm_lock); |
8b88b099 | 1974 | return 0; |
1165f5fe AK |
1975 | } |
1976 | ||
ba1389b7 AK |
1977 | DEFINE_SIMPLE_ATTRIBUTE(vcpu_stat_fops, vcpu_stat_get, NULL, "%llu\n"); |
1978 | ||
828c0950 | 1979 | static const struct file_operations *stat_fops[] = { |
ba1389b7 AK |
1980 | [KVM_STAT_VCPU] = &vcpu_stat_fops, |
1981 | [KVM_STAT_VM] = &vm_stat_fops, | |
1982 | }; | |
1165f5fe | 1983 | |
a16b043c | 1984 | static void kvm_init_debug(void) |
6aa8b732 AK |
1985 | { |
1986 | struct kvm_stats_debugfs_item *p; | |
1987 | ||
76f7c879 | 1988 | kvm_debugfs_dir = debugfs_create_dir("kvm", NULL); |
6aa8b732 | 1989 | for (p = debugfs_entries; p->name; ++p) |
76f7c879 | 1990 | p->dentry = debugfs_create_file(p->name, 0444, kvm_debugfs_dir, |
1165f5fe | 1991 | (void *)(long)p->offset, |
ba1389b7 | 1992 | stat_fops[p->kind]); |
6aa8b732 AK |
1993 | } |
1994 | ||
1995 | static void kvm_exit_debug(void) | |
1996 | { | |
1997 | struct kvm_stats_debugfs_item *p; | |
1998 | ||
1999 | for (p = debugfs_entries; p->name; ++p) | |
2000 | debugfs_remove(p->dentry); | |
76f7c879 | 2001 | debugfs_remove(kvm_debugfs_dir); |
6aa8b732 AK |
2002 | } |
2003 | ||
59ae6c6b AK |
2004 | static int kvm_suspend(struct sys_device *dev, pm_message_t state) |
2005 | { | |
10474ae8 AG |
2006 | if (kvm_usage_count) |
2007 | hardware_disable(NULL); | |
59ae6c6b AK |
2008 | return 0; |
2009 | } | |
2010 | ||
2011 | static int kvm_resume(struct sys_device *dev) | |
2012 | { | |
10474ae8 AG |
2013 | if (kvm_usage_count) |
2014 | hardware_enable(NULL); | |
59ae6c6b AK |
2015 | return 0; |
2016 | } | |
2017 | ||
2018 | static struct sysdev_class kvm_sysdev_class = { | |
af5ca3f4 | 2019 | .name = "kvm", |
59ae6c6b AK |
2020 | .suspend = kvm_suspend, |
2021 | .resume = kvm_resume, | |
2022 | }; | |
2023 | ||
2024 | static struct sys_device kvm_sysdev = { | |
2025 | .id = 0, | |
2026 | .cls = &kvm_sysdev_class, | |
2027 | }; | |
2028 | ||
cea7bb21 | 2029 | struct page *bad_page; |
35149e21 | 2030 | pfn_t bad_pfn; |
6aa8b732 | 2031 | |
15ad7146 AK |
2032 | static inline |
2033 | struct kvm_vcpu *preempt_notifier_to_vcpu(struct preempt_notifier *pn) | |
2034 | { | |
2035 | return container_of(pn, struct kvm_vcpu, preempt_notifier); | |
2036 | } | |
2037 | ||
2038 | static void kvm_sched_in(struct preempt_notifier *pn, int cpu) | |
2039 | { | |
2040 | struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn); | |
2041 | ||
e9b11c17 | 2042 | kvm_arch_vcpu_load(vcpu, cpu); |
15ad7146 AK |
2043 | } |
2044 | ||
2045 | static void kvm_sched_out(struct preempt_notifier *pn, | |
2046 | struct task_struct *next) | |
2047 | { | |
2048 | struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn); | |
2049 | ||
e9b11c17 | 2050 | kvm_arch_vcpu_put(vcpu); |
15ad7146 AK |
2051 | } |
2052 | ||
f8c16bba | 2053 | int kvm_init(void *opaque, unsigned int vcpu_size, |
c16f862d | 2054 | struct module *module) |
6aa8b732 AK |
2055 | { |
2056 | int r; | |
002c7f7c | 2057 | int cpu; |
6aa8b732 | 2058 | |
f8c16bba ZX |
2059 | r = kvm_arch_init(opaque); |
2060 | if (r) | |
d2308784 | 2061 | goto out_fail; |
cb498ea2 ZX |
2062 | |
2063 | bad_page = alloc_page(GFP_KERNEL | __GFP_ZERO); | |
2064 | ||
2065 | if (bad_page == NULL) { | |
2066 | r = -ENOMEM; | |
2067 | goto out; | |
2068 | } | |
2069 | ||
35149e21 AL |
2070 | bad_pfn = page_to_pfn(bad_page); |
2071 | ||
8437a617 | 2072 | if (!zalloc_cpumask_var(&cpus_hardware_enabled, GFP_KERNEL)) { |
7f59f492 RR |
2073 | r = -ENOMEM; |
2074 | goto out_free_0; | |
2075 | } | |
2076 | ||
e9b11c17 | 2077 | r = kvm_arch_hardware_setup(); |
6aa8b732 | 2078 | if (r < 0) |
7f59f492 | 2079 | goto out_free_0a; |
6aa8b732 | 2080 | |
002c7f7c YS |
2081 | for_each_online_cpu(cpu) { |
2082 | smp_call_function_single(cpu, | |
e9b11c17 | 2083 | kvm_arch_check_processor_compat, |
8691e5a8 | 2084 | &r, 1); |
002c7f7c | 2085 | if (r < 0) |
d2308784 | 2086 | goto out_free_1; |
002c7f7c YS |
2087 | } |
2088 | ||
774c47f1 AK |
2089 | r = register_cpu_notifier(&kvm_cpu_notifier); |
2090 | if (r) | |
d2308784 | 2091 | goto out_free_2; |
6aa8b732 AK |
2092 | register_reboot_notifier(&kvm_reboot_notifier); |
2093 | ||
59ae6c6b AK |
2094 | r = sysdev_class_register(&kvm_sysdev_class); |
2095 | if (r) | |
d2308784 | 2096 | goto out_free_3; |
59ae6c6b AK |
2097 | |
2098 | r = sysdev_register(&kvm_sysdev); | |
2099 | if (r) | |
d2308784 | 2100 | goto out_free_4; |
59ae6c6b | 2101 | |
c16f862d RR |
2102 | /* A kmem cache lets us meet the alignment requirements of fx_save. */ |
2103 | kvm_vcpu_cache = kmem_cache_create("kvm_vcpu", vcpu_size, | |
56919c5c JP |
2104 | __alignof__(struct kvm_vcpu), |
2105 | 0, NULL); | |
c16f862d RR |
2106 | if (!kvm_vcpu_cache) { |
2107 | r = -ENOMEM; | |
d2308784 | 2108 | goto out_free_5; |
c16f862d RR |
2109 | } |
2110 | ||
6aa8b732 | 2111 | kvm_chardev_ops.owner = module; |
3d3aab1b CB |
2112 | kvm_vm_fops.owner = module; |
2113 | kvm_vcpu_fops.owner = module; | |
6aa8b732 AK |
2114 | |
2115 | r = misc_register(&kvm_dev); | |
2116 | if (r) { | |
d77c26fc | 2117 | printk(KERN_ERR "kvm: misc device register failed\n"); |
6aa8b732 AK |
2118 | goto out_free; |
2119 | } | |
2120 | ||
15ad7146 AK |
2121 | kvm_preempt_ops.sched_in = kvm_sched_in; |
2122 | kvm_preempt_ops.sched_out = kvm_sched_out; | |
2123 | ||
0ea4ed8e DW |
2124 | kvm_init_debug(); |
2125 | ||
c7addb90 | 2126 | return 0; |
6aa8b732 AK |
2127 | |
2128 | out_free: | |
c16f862d | 2129 | kmem_cache_destroy(kvm_vcpu_cache); |
d2308784 | 2130 | out_free_5: |
59ae6c6b | 2131 | sysdev_unregister(&kvm_sysdev); |
d2308784 | 2132 | out_free_4: |
59ae6c6b | 2133 | sysdev_class_unregister(&kvm_sysdev_class); |
d2308784 | 2134 | out_free_3: |
6aa8b732 | 2135 | unregister_reboot_notifier(&kvm_reboot_notifier); |
774c47f1 | 2136 | unregister_cpu_notifier(&kvm_cpu_notifier); |
d2308784 | 2137 | out_free_2: |
d2308784 | 2138 | out_free_1: |
e9b11c17 | 2139 | kvm_arch_hardware_unsetup(); |
7f59f492 RR |
2140 | out_free_0a: |
2141 | free_cpumask_var(cpus_hardware_enabled); | |
d2308784 ZX |
2142 | out_free_0: |
2143 | __free_page(bad_page); | |
ca45aaae | 2144 | out: |
f8c16bba | 2145 | kvm_arch_exit(); |
d2308784 | 2146 | out_fail: |
6aa8b732 AK |
2147 | return r; |
2148 | } | |
cb498ea2 | 2149 | EXPORT_SYMBOL_GPL(kvm_init); |
6aa8b732 | 2150 | |
cb498ea2 | 2151 | void kvm_exit(void) |
6aa8b732 | 2152 | { |
229456fc | 2153 | tracepoint_synchronize_unregister(); |
0ea4ed8e | 2154 | kvm_exit_debug(); |
6aa8b732 | 2155 | misc_deregister(&kvm_dev); |
c16f862d | 2156 | kmem_cache_destroy(kvm_vcpu_cache); |
59ae6c6b AK |
2157 | sysdev_unregister(&kvm_sysdev); |
2158 | sysdev_class_unregister(&kvm_sysdev_class); | |
6aa8b732 | 2159 | unregister_reboot_notifier(&kvm_reboot_notifier); |
59ae6c6b | 2160 | unregister_cpu_notifier(&kvm_cpu_notifier); |
15c8b6c1 | 2161 | on_each_cpu(hardware_disable, NULL, 1); |
e9b11c17 | 2162 | kvm_arch_hardware_unsetup(); |
f8c16bba | 2163 | kvm_arch_exit(); |
7f59f492 | 2164 | free_cpumask_var(cpus_hardware_enabled); |
cea7bb21 | 2165 | __free_page(bad_page); |
6aa8b732 | 2166 | } |
cb498ea2 | 2167 | EXPORT_SYMBOL_GPL(kvm_exit); |