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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. | |
221d059d | 8 | * Copyright 2010 Red Hat, Inc. and/or its affilates. |
6aa8b732 AK |
9 | * |
10 | * Authors: | |
11 | * Avi Kivity <avi@qumranet.com> | |
12 | * Yaniv Kamay <yaniv@qumranet.com> | |
13 | * | |
14 | * This work is licensed under the terms of the GNU GPL, version 2. See | |
15 | * the COPYING file in the top-level directory. | |
16 | * | |
17 | */ | |
18 | ||
e2174021 | 19 | #include "iodev.h" |
6aa8b732 | 20 | |
edf88417 | 21 | #include <linux/kvm_host.h> |
6aa8b732 AK |
22 | #include <linux/kvm.h> |
23 | #include <linux/module.h> | |
24 | #include <linux/errno.h> | |
6aa8b732 | 25 | #include <linux/percpu.h> |
6aa8b732 AK |
26 | #include <linux/mm.h> |
27 | #include <linux/miscdevice.h> | |
28 | #include <linux/vmalloc.h> | |
6aa8b732 | 29 | #include <linux/reboot.h> |
6aa8b732 AK |
30 | #include <linux/debugfs.h> |
31 | #include <linux/highmem.h> | |
32 | #include <linux/file.h> | |
59ae6c6b | 33 | #include <linux/sysdev.h> |
774c47f1 | 34 | #include <linux/cpu.h> |
e8edc6e0 | 35 | #include <linux/sched.h> |
d9e368d6 AK |
36 | #include <linux/cpumask.h> |
37 | #include <linux/smp.h> | |
d6d28168 | 38 | #include <linux/anon_inodes.h> |
04d2cc77 | 39 | #include <linux/profile.h> |
7aa81cc0 | 40 | #include <linux/kvm_para.h> |
6fc138d2 | 41 | #include <linux/pagemap.h> |
8d4e1288 | 42 | #include <linux/mman.h> |
35149e21 | 43 | #include <linux/swap.h> |
e56d532f | 44 | #include <linux/bitops.h> |
547de29e | 45 | #include <linux/spinlock.h> |
6ff5894c | 46 | #include <linux/compat.h> |
bc6678a3 | 47 | #include <linux/srcu.h> |
8f0b1ab6 | 48 | #include <linux/hugetlb.h> |
5a0e3ad6 | 49 | #include <linux/slab.h> |
6aa8b732 | 50 | |
e495606d | 51 | #include <asm/processor.h> |
e495606d AK |
52 | #include <asm/io.h> |
53 | #include <asm/uaccess.h> | |
3e021bf5 | 54 | #include <asm/pgtable.h> |
c8240bd6 | 55 | #include <asm-generic/bitops/le.h> |
6aa8b732 | 56 | |
5f94c174 | 57 | #include "coalesced_mmio.h" |
5f94c174 | 58 | |
229456fc MT |
59 | #define CREATE_TRACE_POINTS |
60 | #include <trace/events/kvm.h> | |
61 | ||
6aa8b732 AK |
62 | MODULE_AUTHOR("Qumranet"); |
63 | MODULE_LICENSE("GPL"); | |
64 | ||
fa40a821 MT |
65 | /* |
66 | * Ordering of locks: | |
67 | * | |
fae3a353 | 68 | * kvm->lock --> kvm->slots_lock --> kvm->irq_lock |
fa40a821 MT |
69 | */ |
70 | ||
e9b11c17 ZX |
71 | DEFINE_SPINLOCK(kvm_lock); |
72 | LIST_HEAD(vm_list); | |
133de902 | 73 | |
7f59f492 | 74 | static cpumask_var_t cpus_hardware_enabled; |
10474ae8 AG |
75 | static int kvm_usage_count = 0; |
76 | static atomic_t hardware_enable_failed; | |
1b6c0168 | 77 | |
c16f862d RR |
78 | struct kmem_cache *kvm_vcpu_cache; |
79 | EXPORT_SYMBOL_GPL(kvm_vcpu_cache); | |
1165f5fe | 80 | |
15ad7146 AK |
81 | static __read_mostly struct preempt_ops kvm_preempt_ops; |
82 | ||
76f7c879 | 83 | struct dentry *kvm_debugfs_dir; |
6aa8b732 | 84 | |
bccf2150 AK |
85 | static long kvm_vcpu_ioctl(struct file *file, unsigned int ioctl, |
86 | unsigned long arg); | |
10474ae8 AG |
87 | static int hardware_enable_all(void); |
88 | static void hardware_disable_all(void); | |
bccf2150 | 89 | |
e93f8a0f MT |
90 | static void kvm_io_bus_destroy(struct kvm_io_bus *bus); |
91 | ||
e8ba5d31 | 92 | static bool kvm_rebooting; |
4ecac3fd | 93 | |
54dee993 MT |
94 | static bool largepages_enabled = true; |
95 | ||
bf998156 HY |
96 | struct page *hwpoison_page; |
97 | pfn_t hwpoison_pfn; | |
98 | ||
c77fb9dc | 99 | inline int kvm_is_mmio_pfn(pfn_t pfn) |
cbff90a7 | 100 | { |
fc5659c8 JR |
101 | if (pfn_valid(pfn)) { |
102 | struct page *page = compound_head(pfn_to_page(pfn)); | |
103 | return PageReserved(page); | |
104 | } | |
cbff90a7 BAY |
105 | |
106 | return true; | |
107 | } | |
108 | ||
bccf2150 AK |
109 | /* |
110 | * Switches to specified vcpu, until a matching vcpu_put() | |
111 | */ | |
313a3dc7 | 112 | void vcpu_load(struct kvm_vcpu *vcpu) |
6aa8b732 | 113 | { |
15ad7146 AK |
114 | int cpu; |
115 | ||
bccf2150 | 116 | mutex_lock(&vcpu->mutex); |
15ad7146 AK |
117 | cpu = get_cpu(); |
118 | preempt_notifier_register(&vcpu->preempt_notifier); | |
313a3dc7 | 119 | kvm_arch_vcpu_load(vcpu, cpu); |
15ad7146 | 120 | put_cpu(); |
6aa8b732 AK |
121 | } |
122 | ||
313a3dc7 | 123 | void vcpu_put(struct kvm_vcpu *vcpu) |
6aa8b732 | 124 | { |
15ad7146 | 125 | preempt_disable(); |
313a3dc7 | 126 | kvm_arch_vcpu_put(vcpu); |
15ad7146 AK |
127 | preempt_notifier_unregister(&vcpu->preempt_notifier); |
128 | preempt_enable(); | |
6aa8b732 AK |
129 | mutex_unlock(&vcpu->mutex); |
130 | } | |
131 | ||
d9e368d6 AK |
132 | static void ack_flush(void *_completed) |
133 | { | |
d9e368d6 AK |
134 | } |
135 | ||
49846896 | 136 | static bool make_all_cpus_request(struct kvm *kvm, unsigned int req) |
d9e368d6 | 137 | { |
597a5f55 | 138 | int i, cpu, me; |
6ef7a1bc RR |
139 | cpumask_var_t cpus; |
140 | bool called = true; | |
d9e368d6 | 141 | struct kvm_vcpu *vcpu; |
d9e368d6 | 142 | |
79f55997 | 143 | zalloc_cpumask_var(&cpus, GFP_ATOMIC); |
6ef7a1bc | 144 | |
70e335e1 | 145 | raw_spin_lock(&kvm->requests_lock); |
e601e3be | 146 | me = smp_processor_id(); |
988a2cae | 147 | kvm_for_each_vcpu(i, vcpu, kvm) { |
49846896 | 148 | if (test_and_set_bit(req, &vcpu->requests)) |
d9e368d6 AK |
149 | continue; |
150 | cpu = vcpu->cpu; | |
6ef7a1bc RR |
151 | if (cpus != NULL && cpu != -1 && cpu != me) |
152 | cpumask_set_cpu(cpu, cpus); | |
49846896 | 153 | } |
6ef7a1bc RR |
154 | if (unlikely(cpus == NULL)) |
155 | smp_call_function_many(cpu_online_mask, ack_flush, NULL, 1); | |
156 | else if (!cpumask_empty(cpus)) | |
157 | smp_call_function_many(cpus, ack_flush, NULL, 1); | |
158 | else | |
159 | called = false; | |
70e335e1 | 160 | raw_spin_unlock(&kvm->requests_lock); |
6ef7a1bc | 161 | free_cpumask_var(cpus); |
49846896 | 162 | return called; |
d9e368d6 AK |
163 | } |
164 | ||
49846896 | 165 | void kvm_flush_remote_tlbs(struct kvm *kvm) |
2e53d63a | 166 | { |
49846896 RR |
167 | if (make_all_cpus_request(kvm, KVM_REQ_TLB_FLUSH)) |
168 | ++kvm->stat.remote_tlb_flush; | |
2e53d63a MT |
169 | } |
170 | ||
49846896 RR |
171 | void kvm_reload_remote_mmus(struct kvm *kvm) |
172 | { | |
173 | make_all_cpus_request(kvm, KVM_REQ_MMU_RELOAD); | |
174 | } | |
2e53d63a | 175 | |
fb3f0f51 RR |
176 | int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id) |
177 | { | |
178 | struct page *page; | |
179 | int r; | |
180 | ||
181 | mutex_init(&vcpu->mutex); | |
182 | vcpu->cpu = -1; | |
fb3f0f51 RR |
183 | vcpu->kvm = kvm; |
184 | vcpu->vcpu_id = id; | |
b6958ce4 | 185 | init_waitqueue_head(&vcpu->wq); |
fb3f0f51 RR |
186 | |
187 | page = alloc_page(GFP_KERNEL | __GFP_ZERO); | |
188 | if (!page) { | |
189 | r = -ENOMEM; | |
190 | goto fail; | |
191 | } | |
192 | vcpu->run = page_address(page); | |
193 | ||
e9b11c17 | 194 | r = kvm_arch_vcpu_init(vcpu); |
fb3f0f51 | 195 | if (r < 0) |
e9b11c17 | 196 | goto fail_free_run; |
fb3f0f51 RR |
197 | return 0; |
198 | ||
fb3f0f51 RR |
199 | fail_free_run: |
200 | free_page((unsigned long)vcpu->run); | |
201 | fail: | |
76fafa5e | 202 | return r; |
fb3f0f51 RR |
203 | } |
204 | EXPORT_SYMBOL_GPL(kvm_vcpu_init); | |
205 | ||
206 | void kvm_vcpu_uninit(struct kvm_vcpu *vcpu) | |
207 | { | |
e9b11c17 | 208 | kvm_arch_vcpu_uninit(vcpu); |
fb3f0f51 RR |
209 | free_page((unsigned long)vcpu->run); |
210 | } | |
211 | EXPORT_SYMBOL_GPL(kvm_vcpu_uninit); | |
212 | ||
e930bffe AA |
213 | #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER) |
214 | static inline struct kvm *mmu_notifier_to_kvm(struct mmu_notifier *mn) | |
215 | { | |
216 | return container_of(mn, struct kvm, mmu_notifier); | |
217 | } | |
218 | ||
219 | static void kvm_mmu_notifier_invalidate_page(struct mmu_notifier *mn, | |
220 | struct mm_struct *mm, | |
221 | unsigned long address) | |
222 | { | |
223 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
bc6678a3 | 224 | int need_tlb_flush, idx; |
e930bffe AA |
225 | |
226 | /* | |
227 | * When ->invalidate_page runs, the linux pte has been zapped | |
228 | * already but the page is still allocated until | |
229 | * ->invalidate_page returns. So if we increase the sequence | |
230 | * here the kvm page fault will notice if the spte can't be | |
231 | * established because the page is going to be freed. If | |
232 | * instead the kvm page fault establishes the spte before | |
233 | * ->invalidate_page runs, kvm_unmap_hva will release it | |
234 | * before returning. | |
235 | * | |
236 | * The sequence increase only need to be seen at spin_unlock | |
237 | * time, and not at spin_lock time. | |
238 | * | |
239 | * Increasing the sequence after the spin_unlock would be | |
240 | * unsafe because the kvm page fault could then establish the | |
241 | * pte after kvm_unmap_hva returned, without noticing the page | |
242 | * is going to be freed. | |
243 | */ | |
bc6678a3 | 244 | idx = srcu_read_lock(&kvm->srcu); |
e930bffe AA |
245 | spin_lock(&kvm->mmu_lock); |
246 | kvm->mmu_notifier_seq++; | |
247 | need_tlb_flush = kvm_unmap_hva(kvm, address); | |
248 | spin_unlock(&kvm->mmu_lock); | |
bc6678a3 | 249 | srcu_read_unlock(&kvm->srcu, idx); |
e930bffe AA |
250 | |
251 | /* we've to flush the tlb before the pages can be freed */ | |
252 | if (need_tlb_flush) | |
253 | kvm_flush_remote_tlbs(kvm); | |
254 | ||
255 | } | |
256 | ||
3da0dd43 IE |
257 | static void kvm_mmu_notifier_change_pte(struct mmu_notifier *mn, |
258 | struct mm_struct *mm, | |
259 | unsigned long address, | |
260 | pte_t pte) | |
261 | { | |
262 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
bc6678a3 | 263 | int idx; |
3da0dd43 | 264 | |
bc6678a3 | 265 | idx = srcu_read_lock(&kvm->srcu); |
3da0dd43 IE |
266 | spin_lock(&kvm->mmu_lock); |
267 | kvm->mmu_notifier_seq++; | |
268 | kvm_set_spte_hva(kvm, address, pte); | |
269 | spin_unlock(&kvm->mmu_lock); | |
bc6678a3 | 270 | srcu_read_unlock(&kvm->srcu, idx); |
3da0dd43 IE |
271 | } |
272 | ||
e930bffe AA |
273 | static void kvm_mmu_notifier_invalidate_range_start(struct mmu_notifier *mn, |
274 | struct mm_struct *mm, | |
275 | unsigned long start, | |
276 | unsigned long end) | |
277 | { | |
278 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
bc6678a3 | 279 | int need_tlb_flush = 0, idx; |
e930bffe | 280 | |
bc6678a3 | 281 | idx = srcu_read_lock(&kvm->srcu); |
e930bffe AA |
282 | spin_lock(&kvm->mmu_lock); |
283 | /* | |
284 | * The count increase must become visible at unlock time as no | |
285 | * spte can be established without taking the mmu_lock and | |
286 | * count is also read inside the mmu_lock critical section. | |
287 | */ | |
288 | kvm->mmu_notifier_count++; | |
289 | for (; start < end; start += PAGE_SIZE) | |
290 | need_tlb_flush |= kvm_unmap_hva(kvm, start); | |
291 | spin_unlock(&kvm->mmu_lock); | |
bc6678a3 | 292 | srcu_read_unlock(&kvm->srcu, idx); |
e930bffe AA |
293 | |
294 | /* we've to flush the tlb before the pages can be freed */ | |
295 | if (need_tlb_flush) | |
296 | kvm_flush_remote_tlbs(kvm); | |
297 | } | |
298 | ||
299 | static void kvm_mmu_notifier_invalidate_range_end(struct mmu_notifier *mn, | |
300 | struct mm_struct *mm, | |
301 | unsigned long start, | |
302 | unsigned long end) | |
303 | { | |
304 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
305 | ||
306 | spin_lock(&kvm->mmu_lock); | |
307 | /* | |
308 | * This sequence increase will notify the kvm page fault that | |
309 | * the page that is going to be mapped in the spte could have | |
310 | * been freed. | |
311 | */ | |
312 | kvm->mmu_notifier_seq++; | |
313 | /* | |
314 | * The above sequence increase must be visible before the | |
315 | * below count decrease but both values are read by the kvm | |
316 | * page fault under mmu_lock spinlock so we don't need to add | |
317 | * a smb_wmb() here in between the two. | |
318 | */ | |
319 | kvm->mmu_notifier_count--; | |
320 | spin_unlock(&kvm->mmu_lock); | |
321 | ||
322 | BUG_ON(kvm->mmu_notifier_count < 0); | |
323 | } | |
324 | ||
325 | static int kvm_mmu_notifier_clear_flush_young(struct mmu_notifier *mn, | |
326 | struct mm_struct *mm, | |
327 | unsigned long address) | |
328 | { | |
329 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
bc6678a3 | 330 | int young, idx; |
e930bffe | 331 | |
bc6678a3 | 332 | idx = srcu_read_lock(&kvm->srcu); |
e930bffe AA |
333 | spin_lock(&kvm->mmu_lock); |
334 | young = kvm_age_hva(kvm, address); | |
335 | spin_unlock(&kvm->mmu_lock); | |
bc6678a3 | 336 | srcu_read_unlock(&kvm->srcu, idx); |
e930bffe AA |
337 | |
338 | if (young) | |
339 | kvm_flush_remote_tlbs(kvm); | |
340 | ||
341 | return young; | |
342 | } | |
343 | ||
85db06e5 MT |
344 | static void kvm_mmu_notifier_release(struct mmu_notifier *mn, |
345 | struct mm_struct *mm) | |
346 | { | |
347 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
eda2beda LJ |
348 | int idx; |
349 | ||
350 | idx = srcu_read_lock(&kvm->srcu); | |
85db06e5 | 351 | kvm_arch_flush_shadow(kvm); |
eda2beda | 352 | srcu_read_unlock(&kvm->srcu, idx); |
85db06e5 MT |
353 | } |
354 | ||
e930bffe AA |
355 | static const struct mmu_notifier_ops kvm_mmu_notifier_ops = { |
356 | .invalidate_page = kvm_mmu_notifier_invalidate_page, | |
357 | .invalidate_range_start = kvm_mmu_notifier_invalidate_range_start, | |
358 | .invalidate_range_end = kvm_mmu_notifier_invalidate_range_end, | |
359 | .clear_flush_young = kvm_mmu_notifier_clear_flush_young, | |
3da0dd43 | 360 | .change_pte = kvm_mmu_notifier_change_pte, |
85db06e5 | 361 | .release = kvm_mmu_notifier_release, |
e930bffe | 362 | }; |
4c07b0a4 AK |
363 | |
364 | static int kvm_init_mmu_notifier(struct kvm *kvm) | |
365 | { | |
366 | kvm->mmu_notifier.ops = &kvm_mmu_notifier_ops; | |
367 | return mmu_notifier_register(&kvm->mmu_notifier, current->mm); | |
368 | } | |
369 | ||
370 | #else /* !(CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER) */ | |
371 | ||
372 | static int kvm_init_mmu_notifier(struct kvm *kvm) | |
373 | { | |
374 | return 0; | |
375 | } | |
376 | ||
e930bffe AA |
377 | #endif /* CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER */ |
378 | ||
f17abe9a | 379 | static struct kvm *kvm_create_vm(void) |
6aa8b732 | 380 | { |
e93f8a0f | 381 | int r = 0, i; |
d19a9cd2 | 382 | struct kvm *kvm = kvm_arch_create_vm(); |
6aa8b732 | 383 | |
d19a9cd2 ZX |
384 | if (IS_ERR(kvm)) |
385 | goto out; | |
10474ae8 AG |
386 | |
387 | r = hardware_enable_all(); | |
388 | if (r) | |
389 | goto out_err_nodisable; | |
390 | ||
75858a84 AK |
391 | #ifdef CONFIG_HAVE_KVM_IRQCHIP |
392 | INIT_HLIST_HEAD(&kvm->mask_notifier_list); | |
136bdfee | 393 | INIT_HLIST_HEAD(&kvm->irq_ack_notifier_list); |
75858a84 | 394 | #endif |
6aa8b732 | 395 | |
46a26bf5 MT |
396 | r = -ENOMEM; |
397 | kvm->memslots = kzalloc(sizeof(struct kvm_memslots), GFP_KERNEL); | |
398 | if (!kvm->memslots) | |
399 | goto out_err; | |
bc6678a3 MT |
400 | if (init_srcu_struct(&kvm->srcu)) |
401 | goto out_err; | |
e93f8a0f MT |
402 | for (i = 0; i < KVM_NR_BUSES; i++) { |
403 | kvm->buses[i] = kzalloc(sizeof(struct kvm_io_bus), | |
404 | GFP_KERNEL); | |
405 | if (!kvm->buses[i]) { | |
406 | cleanup_srcu_struct(&kvm->srcu); | |
407 | goto out_err; | |
408 | } | |
409 | } | |
46a26bf5 | 410 | |
4c07b0a4 | 411 | r = kvm_init_mmu_notifier(kvm); |
283d0c65 | 412 | if (r) { |
bc6678a3 | 413 | cleanup_srcu_struct(&kvm->srcu); |
283d0c65 | 414 | goto out_err; |
e930bffe | 415 | } |
e930bffe | 416 | |
6d4e4c4f AK |
417 | kvm->mm = current->mm; |
418 | atomic_inc(&kvm->mm->mm_count); | |
aaee2c94 | 419 | spin_lock_init(&kvm->mmu_lock); |
70e335e1 | 420 | raw_spin_lock_init(&kvm->requests_lock); |
d34e6b17 | 421 | kvm_eventfd_init(kvm); |
11ec2804 | 422 | mutex_init(&kvm->lock); |
60eead79 | 423 | mutex_init(&kvm->irq_lock); |
79fac95e | 424 | mutex_init(&kvm->slots_lock); |
d39f13b0 | 425 | atomic_set(&kvm->users_count, 1); |
5e58cfe4 RR |
426 | spin_lock(&kvm_lock); |
427 | list_add(&kvm->vm_list, &vm_list); | |
428 | spin_unlock(&kvm_lock); | |
d19a9cd2 | 429 | out: |
f17abe9a | 430 | return kvm; |
10474ae8 AG |
431 | |
432 | out_err: | |
433 | hardware_disable_all(); | |
434 | out_err_nodisable: | |
e93f8a0f MT |
435 | for (i = 0; i < KVM_NR_BUSES; i++) |
436 | kfree(kvm->buses[i]); | |
46a26bf5 | 437 | kfree(kvm->memslots); |
10474ae8 AG |
438 | kfree(kvm); |
439 | return ERR_PTR(r); | |
f17abe9a AK |
440 | } |
441 | ||
6aa8b732 AK |
442 | /* |
443 | * Free any memory in @free but not in @dont. | |
444 | */ | |
445 | static void kvm_free_physmem_slot(struct kvm_memory_slot *free, | |
446 | struct kvm_memory_slot *dont) | |
447 | { | |
ec04b260 JR |
448 | int i; |
449 | ||
290fc38d IE |
450 | if (!dont || free->rmap != dont->rmap) |
451 | vfree(free->rmap); | |
6aa8b732 AK |
452 | |
453 | if (!dont || free->dirty_bitmap != dont->dirty_bitmap) | |
454 | vfree(free->dirty_bitmap); | |
455 | ||
ec04b260 JR |
456 | |
457 | for (i = 0; i < KVM_NR_PAGE_SIZES - 1; ++i) { | |
458 | if (!dont || free->lpage_info[i] != dont->lpage_info[i]) { | |
459 | vfree(free->lpage_info[i]); | |
460 | free->lpage_info[i] = NULL; | |
461 | } | |
462 | } | |
05da4558 | 463 | |
6aa8b732 | 464 | free->npages = 0; |
8b6d44c7 | 465 | free->dirty_bitmap = NULL; |
8d4e1288 | 466 | free->rmap = NULL; |
6aa8b732 AK |
467 | } |
468 | ||
d19a9cd2 | 469 | void kvm_free_physmem(struct kvm *kvm) |
6aa8b732 AK |
470 | { |
471 | int i; | |
46a26bf5 MT |
472 | struct kvm_memslots *slots = kvm->memslots; |
473 | ||
474 | for (i = 0; i < slots->nmemslots; ++i) | |
475 | kvm_free_physmem_slot(&slots->memslots[i], NULL); | |
6aa8b732 | 476 | |
46a26bf5 | 477 | kfree(kvm->memslots); |
6aa8b732 AK |
478 | } |
479 | ||
f17abe9a AK |
480 | static void kvm_destroy_vm(struct kvm *kvm) |
481 | { | |
e93f8a0f | 482 | int i; |
6d4e4c4f AK |
483 | struct mm_struct *mm = kvm->mm; |
484 | ||
ad8ba2cd | 485 | kvm_arch_sync_events(kvm); |
133de902 AK |
486 | spin_lock(&kvm_lock); |
487 | list_del(&kvm->vm_list); | |
488 | spin_unlock(&kvm_lock); | |
399ec807 | 489 | kvm_free_irq_routing(kvm); |
e93f8a0f MT |
490 | for (i = 0; i < KVM_NR_BUSES; i++) |
491 | kvm_io_bus_destroy(kvm->buses[i]); | |
980da6ce | 492 | kvm_coalesced_mmio_free(kvm); |
e930bffe AA |
493 | #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER) |
494 | mmu_notifier_unregister(&kvm->mmu_notifier, kvm->mm); | |
f00be0ca GN |
495 | #else |
496 | kvm_arch_flush_shadow(kvm); | |
5f94c174 | 497 | #endif |
d19a9cd2 | 498 | kvm_arch_destroy_vm(kvm); |
10474ae8 | 499 | hardware_disable_all(); |
6d4e4c4f | 500 | mmdrop(mm); |
f17abe9a AK |
501 | } |
502 | ||
d39f13b0 IE |
503 | void kvm_get_kvm(struct kvm *kvm) |
504 | { | |
505 | atomic_inc(&kvm->users_count); | |
506 | } | |
507 | EXPORT_SYMBOL_GPL(kvm_get_kvm); | |
508 | ||
509 | void kvm_put_kvm(struct kvm *kvm) | |
510 | { | |
511 | if (atomic_dec_and_test(&kvm->users_count)) | |
512 | kvm_destroy_vm(kvm); | |
513 | } | |
514 | EXPORT_SYMBOL_GPL(kvm_put_kvm); | |
515 | ||
516 | ||
f17abe9a AK |
517 | static int kvm_vm_release(struct inode *inode, struct file *filp) |
518 | { | |
519 | struct kvm *kvm = filp->private_data; | |
520 | ||
721eecbf GH |
521 | kvm_irqfd_release(kvm); |
522 | ||
d39f13b0 | 523 | kvm_put_kvm(kvm); |
6aa8b732 AK |
524 | return 0; |
525 | } | |
526 | ||
6aa8b732 AK |
527 | /* |
528 | * Allocate some memory and give it an address in the guest physical address | |
529 | * space. | |
530 | * | |
531 | * Discontiguous memory is allowed, mostly for framebuffers. | |
f78e0e2e | 532 | * |
10589a46 | 533 | * Must be called holding mmap_sem for write. |
6aa8b732 | 534 | */ |
f78e0e2e SY |
535 | int __kvm_set_memory_region(struct kvm *kvm, |
536 | struct kvm_userspace_memory_region *mem, | |
537 | int user_alloc) | |
6aa8b732 | 538 | { |
bc6678a3 | 539 | int r, flush_shadow = 0; |
6aa8b732 | 540 | gfn_t base_gfn; |
28bcb112 HC |
541 | unsigned long npages; |
542 | unsigned long i; | |
6aa8b732 AK |
543 | struct kvm_memory_slot *memslot; |
544 | struct kvm_memory_slot old, new; | |
bc6678a3 | 545 | struct kvm_memslots *slots, *old_memslots; |
6aa8b732 AK |
546 | |
547 | r = -EINVAL; | |
548 | /* General sanity checks */ | |
549 | if (mem->memory_size & (PAGE_SIZE - 1)) | |
550 | goto out; | |
551 | if (mem->guest_phys_addr & (PAGE_SIZE - 1)) | |
552 | goto out; | |
e7cacd40 | 553 | if (user_alloc && (mem->userspace_addr & (PAGE_SIZE - 1))) |
78749809 | 554 | goto out; |
e0d62c7f | 555 | if (mem->slot >= KVM_MEMORY_SLOTS + KVM_PRIVATE_MEM_SLOTS) |
6aa8b732 AK |
556 | goto out; |
557 | if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr) | |
558 | goto out; | |
559 | ||
46a26bf5 | 560 | memslot = &kvm->memslots->memslots[mem->slot]; |
6aa8b732 AK |
561 | base_gfn = mem->guest_phys_addr >> PAGE_SHIFT; |
562 | npages = mem->memory_size >> PAGE_SHIFT; | |
563 | ||
660c22c4 TY |
564 | r = -EINVAL; |
565 | if (npages > KVM_MEM_MAX_NR_PAGES) | |
566 | goto out; | |
567 | ||
6aa8b732 AK |
568 | if (!npages) |
569 | mem->flags &= ~KVM_MEM_LOG_DIRTY_PAGES; | |
570 | ||
6aa8b732 AK |
571 | new = old = *memslot; |
572 | ||
573 | new.base_gfn = base_gfn; | |
574 | new.npages = npages; | |
575 | new.flags = mem->flags; | |
576 | ||
577 | /* Disallow changing a memory slot's size. */ | |
578 | r = -EINVAL; | |
579 | if (npages && old.npages && npages != old.npages) | |
f78e0e2e | 580 | goto out_free; |
6aa8b732 AK |
581 | |
582 | /* Check for overlaps */ | |
583 | r = -EEXIST; | |
584 | for (i = 0; i < KVM_MEMORY_SLOTS; ++i) { | |
46a26bf5 | 585 | struct kvm_memory_slot *s = &kvm->memslots->memslots[i]; |
6aa8b732 | 586 | |
4cd481f6 | 587 | if (s == memslot || !s->npages) |
6aa8b732 AK |
588 | continue; |
589 | if (!((base_gfn + npages <= s->base_gfn) || | |
590 | (base_gfn >= s->base_gfn + s->npages))) | |
f78e0e2e | 591 | goto out_free; |
6aa8b732 | 592 | } |
6aa8b732 | 593 | |
6aa8b732 AK |
594 | /* Free page dirty bitmap if unneeded */ |
595 | if (!(new.flags & KVM_MEM_LOG_DIRTY_PAGES)) | |
8b6d44c7 | 596 | new.dirty_bitmap = NULL; |
6aa8b732 AK |
597 | |
598 | r = -ENOMEM; | |
599 | ||
600 | /* Allocate if a slot is being created */ | |
eff0114a | 601 | #ifndef CONFIG_S390 |
8d4e1288 | 602 | if (npages && !new.rmap) { |
3bd89007 | 603 | new.rmap = vmalloc(npages * sizeof(*new.rmap)); |
290fc38d IE |
604 | |
605 | if (!new.rmap) | |
f78e0e2e | 606 | goto out_free; |
290fc38d | 607 | |
290fc38d | 608 | memset(new.rmap, 0, npages * sizeof(*new.rmap)); |
8d4e1288 | 609 | |
80b14b5b | 610 | new.user_alloc = user_alloc; |
bc6678a3 | 611 | new.userspace_addr = mem->userspace_addr; |
6aa8b732 | 612 | } |
ec04b260 JR |
613 | if (!npages) |
614 | goto skip_lpage; | |
05da4558 | 615 | |
ec04b260 | 616 | for (i = 0; i < KVM_NR_PAGE_SIZES - 1; ++i) { |
28bcb112 HC |
617 | unsigned long ugfn; |
618 | unsigned long j; | |
619 | int lpages; | |
ec04b260 | 620 | int level = i + 2; |
05da4558 | 621 | |
ec04b260 JR |
622 | /* Avoid unused variable warning if no large pages */ |
623 | (void)level; | |
624 | ||
625 | if (new.lpage_info[i]) | |
626 | continue; | |
627 | ||
628 | lpages = 1 + (base_gfn + npages - 1) / | |
629 | KVM_PAGES_PER_HPAGE(level); | |
630 | lpages -= base_gfn / KVM_PAGES_PER_HPAGE(level); | |
631 | ||
632 | new.lpage_info[i] = vmalloc(lpages * sizeof(*new.lpage_info[i])); | |
633 | ||
634 | if (!new.lpage_info[i]) | |
05da4558 MT |
635 | goto out_free; |
636 | ||
ec04b260 JR |
637 | memset(new.lpage_info[i], 0, |
638 | lpages * sizeof(*new.lpage_info[i])); | |
05da4558 | 639 | |
ec04b260 JR |
640 | if (base_gfn % KVM_PAGES_PER_HPAGE(level)) |
641 | new.lpage_info[i][0].write_count = 1; | |
642 | if ((base_gfn+npages) % KVM_PAGES_PER_HPAGE(level)) | |
643 | new.lpage_info[i][lpages - 1].write_count = 1; | |
ac04527f AK |
644 | ugfn = new.userspace_addr >> PAGE_SHIFT; |
645 | /* | |
646 | * If the gfn and userspace address are not aligned wrt each | |
54dee993 MT |
647 | * other, or if explicitly asked to, disable large page |
648 | * support for this slot | |
ac04527f | 649 | */ |
ec04b260 | 650 | if ((base_gfn ^ ugfn) & (KVM_PAGES_PER_HPAGE(level) - 1) || |
54dee993 | 651 | !largepages_enabled) |
ec04b260 JR |
652 | for (j = 0; j < lpages; ++j) |
653 | new.lpage_info[i][j].write_count = 1; | |
05da4558 | 654 | } |
6aa8b732 | 655 | |
ec04b260 JR |
656 | skip_lpage: |
657 | ||
6aa8b732 AK |
658 | /* Allocate page dirty bitmap if needed */ |
659 | if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) { | |
87bf6e7d | 660 | unsigned long dirty_bytes = kvm_dirty_bitmap_bytes(&new); |
6aa8b732 AK |
661 | |
662 | new.dirty_bitmap = vmalloc(dirty_bytes); | |
663 | if (!new.dirty_bitmap) | |
f78e0e2e | 664 | goto out_free; |
6aa8b732 | 665 | memset(new.dirty_bitmap, 0, dirty_bytes); |
bc6678a3 | 666 | /* destroy any largepage mappings for dirty tracking */ |
e244584f | 667 | if (old.npages) |
bc6678a3 | 668 | flush_shadow = 1; |
6aa8b732 | 669 | } |
3eea8437 CB |
670 | #else /* not defined CONFIG_S390 */ |
671 | new.user_alloc = user_alloc; | |
672 | if (user_alloc) | |
673 | new.userspace_addr = mem->userspace_addr; | |
eff0114a | 674 | #endif /* not defined CONFIG_S390 */ |
6aa8b732 | 675 | |
bc6678a3 MT |
676 | if (!npages) { |
677 | r = -ENOMEM; | |
678 | slots = kzalloc(sizeof(struct kvm_memslots), GFP_KERNEL); | |
679 | if (!slots) | |
680 | goto out_free; | |
681 | memcpy(slots, kvm->memslots, sizeof(struct kvm_memslots)); | |
682 | if (mem->slot >= slots->nmemslots) | |
683 | slots->nmemslots = mem->slot + 1; | |
684 | slots->memslots[mem->slot].flags |= KVM_MEMSLOT_INVALID; | |
685 | ||
686 | old_memslots = kvm->memslots; | |
687 | rcu_assign_pointer(kvm->memslots, slots); | |
688 | synchronize_srcu_expedited(&kvm->srcu); | |
689 | /* From this point no new shadow pages pointing to a deleted | |
690 | * memslot will be created. | |
691 | * | |
692 | * validation of sp->gfn happens in: | |
693 | * - gfn_to_hva (kvm_read_guest, gfn_to_pfn) | |
694 | * - kvm_is_visible_gfn (mmu_check_roots) | |
695 | */ | |
34d4cb8f | 696 | kvm_arch_flush_shadow(kvm); |
bc6678a3 MT |
697 | kfree(old_memslots); |
698 | } | |
34d4cb8f | 699 | |
f7784b8e MT |
700 | r = kvm_arch_prepare_memory_region(kvm, &new, old, mem, user_alloc); |
701 | if (r) | |
702 | goto out_free; | |
703 | ||
bc6678a3 MT |
704 | #ifdef CONFIG_DMAR |
705 | /* map the pages in iommu page table */ | |
706 | if (npages) { | |
707 | r = kvm_iommu_map_pages(kvm, &new); | |
708 | if (r) | |
709 | goto out_free; | |
710 | } | |
711 | #endif | |
604b38ac | 712 | |
bc6678a3 MT |
713 | r = -ENOMEM; |
714 | slots = kzalloc(sizeof(struct kvm_memslots), GFP_KERNEL); | |
715 | if (!slots) | |
716 | goto out_free; | |
717 | memcpy(slots, kvm->memslots, sizeof(struct kvm_memslots)); | |
718 | if (mem->slot >= slots->nmemslots) | |
719 | slots->nmemslots = mem->slot + 1; | |
720 | ||
721 | /* actual memory is freed via old in kvm_free_physmem_slot below */ | |
722 | if (!npages) { | |
723 | new.rmap = NULL; | |
724 | new.dirty_bitmap = NULL; | |
725 | for (i = 0; i < KVM_NR_PAGE_SIZES - 1; ++i) | |
726 | new.lpage_info[i] = NULL; | |
727 | } | |
728 | ||
729 | slots->memslots[mem->slot] = new; | |
730 | old_memslots = kvm->memslots; | |
731 | rcu_assign_pointer(kvm->memslots, slots); | |
732 | synchronize_srcu_expedited(&kvm->srcu); | |
3ad82a7e | 733 | |
f7784b8e | 734 | kvm_arch_commit_memory_region(kvm, mem, old, user_alloc); |
82ce2c96 | 735 | |
bc6678a3 MT |
736 | kvm_free_physmem_slot(&old, &new); |
737 | kfree(old_memslots); | |
738 | ||
739 | if (flush_shadow) | |
740 | kvm_arch_flush_shadow(kvm); | |
741 | ||
6aa8b732 AK |
742 | return 0; |
743 | ||
f78e0e2e | 744 | out_free: |
6aa8b732 AK |
745 | kvm_free_physmem_slot(&new, &old); |
746 | out: | |
747 | return r; | |
210c7c4d IE |
748 | |
749 | } | |
f78e0e2e SY |
750 | EXPORT_SYMBOL_GPL(__kvm_set_memory_region); |
751 | ||
752 | int kvm_set_memory_region(struct kvm *kvm, | |
753 | struct kvm_userspace_memory_region *mem, | |
754 | int user_alloc) | |
755 | { | |
756 | int r; | |
757 | ||
79fac95e | 758 | mutex_lock(&kvm->slots_lock); |
f78e0e2e | 759 | r = __kvm_set_memory_region(kvm, mem, user_alloc); |
79fac95e | 760 | mutex_unlock(&kvm->slots_lock); |
f78e0e2e SY |
761 | return r; |
762 | } | |
210c7c4d IE |
763 | EXPORT_SYMBOL_GPL(kvm_set_memory_region); |
764 | ||
1fe779f8 CO |
765 | int kvm_vm_ioctl_set_memory_region(struct kvm *kvm, |
766 | struct | |
767 | kvm_userspace_memory_region *mem, | |
768 | int user_alloc) | |
210c7c4d | 769 | { |
e0d62c7f IE |
770 | if (mem->slot >= KVM_MEMORY_SLOTS) |
771 | return -EINVAL; | |
210c7c4d | 772 | return kvm_set_memory_region(kvm, mem, user_alloc); |
6aa8b732 AK |
773 | } |
774 | ||
5bb064dc ZX |
775 | int kvm_get_dirty_log(struct kvm *kvm, |
776 | struct kvm_dirty_log *log, int *is_dirty) | |
6aa8b732 AK |
777 | { |
778 | struct kvm_memory_slot *memslot; | |
779 | int r, i; | |
87bf6e7d | 780 | unsigned long n; |
6aa8b732 AK |
781 | unsigned long any = 0; |
782 | ||
6aa8b732 AK |
783 | r = -EINVAL; |
784 | if (log->slot >= KVM_MEMORY_SLOTS) | |
785 | goto out; | |
786 | ||
46a26bf5 | 787 | memslot = &kvm->memslots->memslots[log->slot]; |
6aa8b732 AK |
788 | r = -ENOENT; |
789 | if (!memslot->dirty_bitmap) | |
790 | goto out; | |
791 | ||
87bf6e7d | 792 | n = kvm_dirty_bitmap_bytes(memslot); |
6aa8b732 | 793 | |
cd1a4a98 | 794 | for (i = 0; !any && i < n/sizeof(long); ++i) |
6aa8b732 AK |
795 | any = memslot->dirty_bitmap[i]; |
796 | ||
797 | r = -EFAULT; | |
798 | if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n)) | |
799 | goto out; | |
800 | ||
5bb064dc ZX |
801 | if (any) |
802 | *is_dirty = 1; | |
6aa8b732 AK |
803 | |
804 | r = 0; | |
6aa8b732 | 805 | out: |
6aa8b732 AK |
806 | return r; |
807 | } | |
808 | ||
54dee993 MT |
809 | void kvm_disable_largepages(void) |
810 | { | |
811 | largepages_enabled = false; | |
812 | } | |
813 | EXPORT_SYMBOL_GPL(kvm_disable_largepages); | |
814 | ||
cea7bb21 IE |
815 | int is_error_page(struct page *page) |
816 | { | |
bf998156 | 817 | return page == bad_page || page == hwpoison_page; |
cea7bb21 IE |
818 | } |
819 | EXPORT_SYMBOL_GPL(is_error_page); | |
820 | ||
35149e21 AL |
821 | int is_error_pfn(pfn_t pfn) |
822 | { | |
bf998156 | 823 | return pfn == bad_pfn || pfn == hwpoison_pfn; |
35149e21 AL |
824 | } |
825 | EXPORT_SYMBOL_GPL(is_error_pfn); | |
826 | ||
bf998156 HY |
827 | int is_hwpoison_pfn(pfn_t pfn) |
828 | { | |
829 | return pfn == hwpoison_pfn; | |
830 | } | |
831 | EXPORT_SYMBOL_GPL(is_hwpoison_pfn); | |
832 | ||
f9d46eb0 IE |
833 | static inline unsigned long bad_hva(void) |
834 | { | |
835 | return PAGE_OFFSET; | |
836 | } | |
837 | ||
838 | int kvm_is_error_hva(unsigned long addr) | |
839 | { | |
840 | return addr == bad_hva(); | |
841 | } | |
842 | EXPORT_SYMBOL_GPL(kvm_is_error_hva); | |
843 | ||
a1f4d395 | 844 | struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn) |
6aa8b732 AK |
845 | { |
846 | int i; | |
90d83dc3 | 847 | struct kvm_memslots *slots = kvm_memslots(kvm); |
6aa8b732 | 848 | |
46a26bf5 MT |
849 | for (i = 0; i < slots->nmemslots; ++i) { |
850 | struct kvm_memory_slot *memslot = &slots->memslots[i]; | |
6aa8b732 AK |
851 | |
852 | if (gfn >= memslot->base_gfn | |
853 | && gfn < memslot->base_gfn + memslot->npages) | |
854 | return memslot; | |
855 | } | |
8b6d44c7 | 856 | return NULL; |
6aa8b732 | 857 | } |
a1f4d395 | 858 | EXPORT_SYMBOL_GPL(gfn_to_memslot); |
6aa8b732 | 859 | |
e0d62c7f IE |
860 | int kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn) |
861 | { | |
862 | int i; | |
90d83dc3 | 863 | struct kvm_memslots *slots = kvm_memslots(kvm); |
e0d62c7f | 864 | |
e0d62c7f | 865 | for (i = 0; i < KVM_MEMORY_SLOTS; ++i) { |
46a26bf5 | 866 | struct kvm_memory_slot *memslot = &slots->memslots[i]; |
e0d62c7f | 867 | |
bc6678a3 MT |
868 | if (memslot->flags & KVM_MEMSLOT_INVALID) |
869 | continue; | |
870 | ||
e0d62c7f IE |
871 | if (gfn >= memslot->base_gfn |
872 | && gfn < memslot->base_gfn + memslot->npages) | |
873 | return 1; | |
874 | } | |
875 | return 0; | |
876 | } | |
877 | EXPORT_SYMBOL_GPL(kvm_is_visible_gfn); | |
878 | ||
8f0b1ab6 JR |
879 | unsigned long kvm_host_page_size(struct kvm *kvm, gfn_t gfn) |
880 | { | |
881 | struct vm_area_struct *vma; | |
882 | unsigned long addr, size; | |
883 | ||
884 | size = PAGE_SIZE; | |
885 | ||
886 | addr = gfn_to_hva(kvm, gfn); | |
887 | if (kvm_is_error_hva(addr)) | |
888 | return PAGE_SIZE; | |
889 | ||
890 | down_read(¤t->mm->mmap_sem); | |
891 | vma = find_vma(current->mm, addr); | |
892 | if (!vma) | |
893 | goto out; | |
894 | ||
895 | size = vma_kernel_pagesize(vma); | |
896 | ||
897 | out: | |
898 | up_read(¤t->mm->mmap_sem); | |
899 | ||
900 | return size; | |
901 | } | |
902 | ||
bc6678a3 MT |
903 | int memslot_id(struct kvm *kvm, gfn_t gfn) |
904 | { | |
905 | int i; | |
90d83dc3 | 906 | struct kvm_memslots *slots = kvm_memslots(kvm); |
bc6678a3 MT |
907 | struct kvm_memory_slot *memslot = NULL; |
908 | ||
bc6678a3 MT |
909 | for (i = 0; i < slots->nmemslots; ++i) { |
910 | memslot = &slots->memslots[i]; | |
911 | ||
912 | if (gfn >= memslot->base_gfn | |
913 | && gfn < memslot->base_gfn + memslot->npages) | |
914 | break; | |
915 | } | |
916 | ||
917 | return memslot - slots->memslots; | |
918 | } | |
919 | ||
f5c98031 TY |
920 | static unsigned long gfn_to_hva_memslot(struct kvm_memory_slot *slot, gfn_t gfn) |
921 | { | |
922 | return slot->userspace_addr + (gfn - slot->base_gfn) * PAGE_SIZE; | |
923 | } | |
924 | ||
05da4558 | 925 | unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn) |
539cb660 IE |
926 | { |
927 | struct kvm_memory_slot *slot; | |
928 | ||
a1f4d395 | 929 | slot = gfn_to_memslot(kvm, gfn); |
bc6678a3 | 930 | if (!slot || slot->flags & KVM_MEMSLOT_INVALID) |
539cb660 | 931 | return bad_hva(); |
f5c98031 | 932 | return gfn_to_hva_memslot(slot, gfn); |
539cb660 | 933 | } |
0d150298 | 934 | EXPORT_SYMBOL_GPL(gfn_to_hva); |
539cb660 | 935 | |
506f0d6f | 936 | static pfn_t hva_to_pfn(struct kvm *kvm, unsigned long addr) |
954bbbc2 | 937 | { |
8d4e1288 AL |
938 | struct page *page[1]; |
939 | int npages; | |
2e2e3738 | 940 | pfn_t pfn; |
954bbbc2 | 941 | |
60395224 AK |
942 | might_sleep(); |
943 | ||
4c2155ce | 944 | npages = get_user_pages_fast(addr, 1, 1, page); |
539cb660 | 945 | |
2e2e3738 AL |
946 | if (unlikely(npages != 1)) { |
947 | struct vm_area_struct *vma; | |
948 | ||
bf998156 HY |
949 | if (is_hwpoison_address(addr)) { |
950 | get_page(hwpoison_page); | |
951 | return page_to_pfn(hwpoison_page); | |
952 | } | |
953 | ||
4c2155ce | 954 | down_read(¤t->mm->mmap_sem); |
2e2e3738 | 955 | vma = find_vma(current->mm, addr); |
4c2155ce | 956 | |
2e2e3738 AL |
957 | if (vma == NULL || addr < vma->vm_start || |
958 | !(vma->vm_flags & VM_PFNMAP)) { | |
4c2155ce | 959 | up_read(¤t->mm->mmap_sem); |
2e2e3738 AL |
960 | get_page(bad_page); |
961 | return page_to_pfn(bad_page); | |
962 | } | |
963 | ||
964 | pfn = ((addr - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff; | |
4c2155ce | 965 | up_read(¤t->mm->mmap_sem); |
c77fb9dc | 966 | BUG_ON(!kvm_is_mmio_pfn(pfn)); |
2e2e3738 AL |
967 | } else |
968 | pfn = page_to_pfn(page[0]); | |
8d4e1288 | 969 | |
2e2e3738 | 970 | return pfn; |
35149e21 AL |
971 | } |
972 | ||
506f0d6f MT |
973 | pfn_t gfn_to_pfn(struct kvm *kvm, gfn_t gfn) |
974 | { | |
975 | unsigned long addr; | |
976 | ||
977 | addr = gfn_to_hva(kvm, gfn); | |
978 | if (kvm_is_error_hva(addr)) { | |
979 | get_page(bad_page); | |
980 | return page_to_pfn(bad_page); | |
981 | } | |
982 | ||
983 | return hva_to_pfn(kvm, addr); | |
984 | } | |
35149e21 AL |
985 | EXPORT_SYMBOL_GPL(gfn_to_pfn); |
986 | ||
506f0d6f MT |
987 | pfn_t gfn_to_pfn_memslot(struct kvm *kvm, |
988 | struct kvm_memory_slot *slot, gfn_t gfn) | |
989 | { | |
990 | unsigned long addr = gfn_to_hva_memslot(slot, gfn); | |
991 | return hva_to_pfn(kvm, addr); | |
992 | } | |
993 | ||
35149e21 AL |
994 | struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn) |
995 | { | |
2e2e3738 AL |
996 | pfn_t pfn; |
997 | ||
998 | pfn = gfn_to_pfn(kvm, gfn); | |
c77fb9dc | 999 | if (!kvm_is_mmio_pfn(pfn)) |
2e2e3738 AL |
1000 | return pfn_to_page(pfn); |
1001 | ||
c77fb9dc | 1002 | WARN_ON(kvm_is_mmio_pfn(pfn)); |
2e2e3738 AL |
1003 | |
1004 | get_page(bad_page); | |
1005 | return bad_page; | |
954bbbc2 | 1006 | } |
aab61cc0 | 1007 | |
954bbbc2 AK |
1008 | EXPORT_SYMBOL_GPL(gfn_to_page); |
1009 | ||
b4231d61 IE |
1010 | void kvm_release_page_clean(struct page *page) |
1011 | { | |
35149e21 | 1012 | kvm_release_pfn_clean(page_to_pfn(page)); |
b4231d61 IE |
1013 | } |
1014 | EXPORT_SYMBOL_GPL(kvm_release_page_clean); | |
1015 | ||
35149e21 AL |
1016 | void kvm_release_pfn_clean(pfn_t pfn) |
1017 | { | |
c77fb9dc | 1018 | if (!kvm_is_mmio_pfn(pfn)) |
2e2e3738 | 1019 | put_page(pfn_to_page(pfn)); |
35149e21 AL |
1020 | } |
1021 | EXPORT_SYMBOL_GPL(kvm_release_pfn_clean); | |
1022 | ||
b4231d61 | 1023 | void kvm_release_page_dirty(struct page *page) |
8a7ae055 | 1024 | { |
35149e21 AL |
1025 | kvm_release_pfn_dirty(page_to_pfn(page)); |
1026 | } | |
1027 | EXPORT_SYMBOL_GPL(kvm_release_page_dirty); | |
1028 | ||
1029 | void kvm_release_pfn_dirty(pfn_t pfn) | |
1030 | { | |
1031 | kvm_set_pfn_dirty(pfn); | |
1032 | kvm_release_pfn_clean(pfn); | |
1033 | } | |
1034 | EXPORT_SYMBOL_GPL(kvm_release_pfn_dirty); | |
1035 | ||
1036 | void kvm_set_page_dirty(struct page *page) | |
1037 | { | |
1038 | kvm_set_pfn_dirty(page_to_pfn(page)); | |
1039 | } | |
1040 | EXPORT_SYMBOL_GPL(kvm_set_page_dirty); | |
1041 | ||
1042 | void kvm_set_pfn_dirty(pfn_t pfn) | |
1043 | { | |
c77fb9dc | 1044 | if (!kvm_is_mmio_pfn(pfn)) { |
2e2e3738 AL |
1045 | struct page *page = pfn_to_page(pfn); |
1046 | if (!PageReserved(page)) | |
1047 | SetPageDirty(page); | |
1048 | } | |
8a7ae055 | 1049 | } |
35149e21 AL |
1050 | EXPORT_SYMBOL_GPL(kvm_set_pfn_dirty); |
1051 | ||
1052 | void kvm_set_pfn_accessed(pfn_t pfn) | |
1053 | { | |
c77fb9dc | 1054 | if (!kvm_is_mmio_pfn(pfn)) |
2e2e3738 | 1055 | mark_page_accessed(pfn_to_page(pfn)); |
35149e21 AL |
1056 | } |
1057 | EXPORT_SYMBOL_GPL(kvm_set_pfn_accessed); | |
1058 | ||
1059 | void kvm_get_pfn(pfn_t pfn) | |
1060 | { | |
c77fb9dc | 1061 | if (!kvm_is_mmio_pfn(pfn)) |
2e2e3738 | 1062 | get_page(pfn_to_page(pfn)); |
35149e21 AL |
1063 | } |
1064 | EXPORT_SYMBOL_GPL(kvm_get_pfn); | |
8a7ae055 | 1065 | |
195aefde IE |
1066 | static int next_segment(unsigned long len, int offset) |
1067 | { | |
1068 | if (len > PAGE_SIZE - offset) | |
1069 | return PAGE_SIZE - offset; | |
1070 | else | |
1071 | return len; | |
1072 | } | |
1073 | ||
1074 | int kvm_read_guest_page(struct kvm *kvm, gfn_t gfn, void *data, int offset, | |
1075 | int len) | |
1076 | { | |
e0506bcb IE |
1077 | int r; |
1078 | unsigned long addr; | |
195aefde | 1079 | |
e0506bcb IE |
1080 | addr = gfn_to_hva(kvm, gfn); |
1081 | if (kvm_is_error_hva(addr)) | |
1082 | return -EFAULT; | |
1083 | r = copy_from_user(data, (void __user *)addr + offset, len); | |
1084 | if (r) | |
195aefde | 1085 | return -EFAULT; |
195aefde IE |
1086 | return 0; |
1087 | } | |
1088 | EXPORT_SYMBOL_GPL(kvm_read_guest_page); | |
1089 | ||
1090 | int kvm_read_guest(struct kvm *kvm, gpa_t gpa, void *data, unsigned long len) | |
1091 | { | |
1092 | gfn_t gfn = gpa >> PAGE_SHIFT; | |
1093 | int seg; | |
1094 | int offset = offset_in_page(gpa); | |
1095 | int ret; | |
1096 | ||
1097 | while ((seg = next_segment(len, offset)) != 0) { | |
1098 | ret = kvm_read_guest_page(kvm, gfn, data, offset, seg); | |
1099 | if (ret < 0) | |
1100 | return ret; | |
1101 | offset = 0; | |
1102 | len -= seg; | |
1103 | data += seg; | |
1104 | ++gfn; | |
1105 | } | |
1106 | return 0; | |
1107 | } | |
1108 | EXPORT_SYMBOL_GPL(kvm_read_guest); | |
1109 | ||
7ec54588 MT |
1110 | int kvm_read_guest_atomic(struct kvm *kvm, gpa_t gpa, void *data, |
1111 | unsigned long len) | |
1112 | { | |
1113 | int r; | |
1114 | unsigned long addr; | |
1115 | gfn_t gfn = gpa >> PAGE_SHIFT; | |
1116 | int offset = offset_in_page(gpa); | |
1117 | ||
1118 | addr = gfn_to_hva(kvm, gfn); | |
1119 | if (kvm_is_error_hva(addr)) | |
1120 | return -EFAULT; | |
0aac03f0 | 1121 | pagefault_disable(); |
7ec54588 | 1122 | r = __copy_from_user_inatomic(data, (void __user *)addr + offset, len); |
0aac03f0 | 1123 | pagefault_enable(); |
7ec54588 MT |
1124 | if (r) |
1125 | return -EFAULT; | |
1126 | return 0; | |
1127 | } | |
1128 | EXPORT_SYMBOL(kvm_read_guest_atomic); | |
1129 | ||
195aefde IE |
1130 | int kvm_write_guest_page(struct kvm *kvm, gfn_t gfn, const void *data, |
1131 | int offset, int len) | |
1132 | { | |
e0506bcb IE |
1133 | int r; |
1134 | unsigned long addr; | |
195aefde | 1135 | |
e0506bcb IE |
1136 | addr = gfn_to_hva(kvm, gfn); |
1137 | if (kvm_is_error_hva(addr)) | |
1138 | return -EFAULT; | |
1139 | r = copy_to_user((void __user *)addr + offset, data, len); | |
1140 | if (r) | |
195aefde | 1141 | return -EFAULT; |
195aefde IE |
1142 | mark_page_dirty(kvm, gfn); |
1143 | return 0; | |
1144 | } | |
1145 | EXPORT_SYMBOL_GPL(kvm_write_guest_page); | |
1146 | ||
1147 | int kvm_write_guest(struct kvm *kvm, gpa_t gpa, const void *data, | |
1148 | unsigned long len) | |
1149 | { | |
1150 | gfn_t gfn = gpa >> PAGE_SHIFT; | |
1151 | int seg; | |
1152 | int offset = offset_in_page(gpa); | |
1153 | int ret; | |
1154 | ||
1155 | while ((seg = next_segment(len, offset)) != 0) { | |
1156 | ret = kvm_write_guest_page(kvm, gfn, data, offset, seg); | |
1157 | if (ret < 0) | |
1158 | return ret; | |
1159 | offset = 0; | |
1160 | len -= seg; | |
1161 | data += seg; | |
1162 | ++gfn; | |
1163 | } | |
1164 | return 0; | |
1165 | } | |
1166 | ||
1167 | int kvm_clear_guest_page(struct kvm *kvm, gfn_t gfn, int offset, int len) | |
1168 | { | |
3e021bf5 | 1169 | return kvm_write_guest_page(kvm, gfn, empty_zero_page, offset, len); |
195aefde IE |
1170 | } |
1171 | EXPORT_SYMBOL_GPL(kvm_clear_guest_page); | |
1172 | ||
1173 | int kvm_clear_guest(struct kvm *kvm, gpa_t gpa, unsigned long len) | |
1174 | { | |
1175 | gfn_t gfn = gpa >> PAGE_SHIFT; | |
1176 | int seg; | |
1177 | int offset = offset_in_page(gpa); | |
1178 | int ret; | |
1179 | ||
1180 | while ((seg = next_segment(len, offset)) != 0) { | |
1181 | ret = kvm_clear_guest_page(kvm, gfn, offset, seg); | |
1182 | if (ret < 0) | |
1183 | return ret; | |
1184 | offset = 0; | |
1185 | len -= seg; | |
1186 | ++gfn; | |
1187 | } | |
1188 | return 0; | |
1189 | } | |
1190 | EXPORT_SYMBOL_GPL(kvm_clear_guest); | |
1191 | ||
6aa8b732 AK |
1192 | void mark_page_dirty(struct kvm *kvm, gfn_t gfn) |
1193 | { | |
31389947 | 1194 | struct kvm_memory_slot *memslot; |
6aa8b732 | 1195 | |
a1f4d395 | 1196 | memslot = gfn_to_memslot(kvm, gfn); |
7e9d619d RR |
1197 | if (memslot && memslot->dirty_bitmap) { |
1198 | unsigned long rel_gfn = gfn - memslot->base_gfn; | |
6aa8b732 | 1199 | |
d1476937 | 1200 | generic___set_le_bit(rel_gfn, memslot->dirty_bitmap); |
6aa8b732 AK |
1201 | } |
1202 | } | |
1203 | ||
b6958ce4 ED |
1204 | /* |
1205 | * The vCPU has executed a HLT instruction with in-kernel mode enabled. | |
1206 | */ | |
8776e519 | 1207 | void kvm_vcpu_block(struct kvm_vcpu *vcpu) |
d3bef15f | 1208 | { |
e5c239cf MT |
1209 | DEFINE_WAIT(wait); |
1210 | ||
1211 | for (;;) { | |
1212 | prepare_to_wait(&vcpu->wq, &wait, TASK_INTERRUPTIBLE); | |
1213 | ||
a1b37100 | 1214 | if (kvm_arch_vcpu_runnable(vcpu)) { |
d7690175 | 1215 | set_bit(KVM_REQ_UNHALT, &vcpu->requests); |
e5c239cf | 1216 | break; |
d7690175 | 1217 | } |
09cec754 GN |
1218 | if (kvm_cpu_has_pending_timer(vcpu)) |
1219 | break; | |
e5c239cf MT |
1220 | if (signal_pending(current)) |
1221 | break; | |
1222 | ||
b6958ce4 | 1223 | schedule(); |
b6958ce4 | 1224 | } |
d3bef15f | 1225 | |
e5c239cf | 1226 | finish_wait(&vcpu->wq, &wait); |
b6958ce4 ED |
1227 | } |
1228 | ||
6aa8b732 AK |
1229 | void kvm_resched(struct kvm_vcpu *vcpu) |
1230 | { | |
3fca0365 YD |
1231 | if (!need_resched()) |
1232 | return; | |
6aa8b732 | 1233 | cond_resched(); |
6aa8b732 AK |
1234 | } |
1235 | EXPORT_SYMBOL_GPL(kvm_resched); | |
1236 | ||
d255f4f2 ZE |
1237 | void kvm_vcpu_on_spin(struct kvm_vcpu *vcpu) |
1238 | { | |
1239 | ktime_t expires; | |
1240 | DEFINE_WAIT(wait); | |
1241 | ||
1242 | prepare_to_wait(&vcpu->wq, &wait, TASK_INTERRUPTIBLE); | |
1243 | ||
1244 | /* Sleep for 100 us, and hope lock-holder got scheduled */ | |
1245 | expires = ktime_add_ns(ktime_get(), 100000UL); | |
1246 | schedule_hrtimeout(&expires, HRTIMER_MODE_ABS); | |
1247 | ||
1248 | finish_wait(&vcpu->wq, &wait); | |
1249 | } | |
1250 | EXPORT_SYMBOL_GPL(kvm_vcpu_on_spin); | |
1251 | ||
e4a533a4 | 1252 | static int kvm_vcpu_fault(struct vm_area_struct *vma, struct vm_fault *vmf) |
9a2bb7f4 AK |
1253 | { |
1254 | struct kvm_vcpu *vcpu = vma->vm_file->private_data; | |
9a2bb7f4 AK |
1255 | struct page *page; |
1256 | ||
e4a533a4 | 1257 | if (vmf->pgoff == 0) |
039576c0 | 1258 | page = virt_to_page(vcpu->run); |
09566765 | 1259 | #ifdef CONFIG_X86 |
e4a533a4 | 1260 | else if (vmf->pgoff == KVM_PIO_PAGE_OFFSET) |
ad312c7c | 1261 | page = virt_to_page(vcpu->arch.pio_data); |
5f94c174 LV |
1262 | #endif |
1263 | #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET | |
1264 | else if (vmf->pgoff == KVM_COALESCED_MMIO_PAGE_OFFSET) | |
1265 | page = virt_to_page(vcpu->kvm->coalesced_mmio_ring); | |
09566765 | 1266 | #endif |
039576c0 | 1267 | else |
e4a533a4 | 1268 | return VM_FAULT_SIGBUS; |
9a2bb7f4 | 1269 | get_page(page); |
e4a533a4 | 1270 | vmf->page = page; |
1271 | return 0; | |
9a2bb7f4 AK |
1272 | } |
1273 | ||
f0f37e2f | 1274 | static const struct vm_operations_struct kvm_vcpu_vm_ops = { |
e4a533a4 | 1275 | .fault = kvm_vcpu_fault, |
9a2bb7f4 AK |
1276 | }; |
1277 | ||
1278 | static int kvm_vcpu_mmap(struct file *file, struct vm_area_struct *vma) | |
1279 | { | |
1280 | vma->vm_ops = &kvm_vcpu_vm_ops; | |
1281 | return 0; | |
1282 | } | |
1283 | ||
bccf2150 AK |
1284 | static int kvm_vcpu_release(struct inode *inode, struct file *filp) |
1285 | { | |
1286 | struct kvm_vcpu *vcpu = filp->private_data; | |
1287 | ||
66c0b394 | 1288 | kvm_put_kvm(vcpu->kvm); |
bccf2150 AK |
1289 | return 0; |
1290 | } | |
1291 | ||
3d3aab1b | 1292 | static struct file_operations kvm_vcpu_fops = { |
bccf2150 AK |
1293 | .release = kvm_vcpu_release, |
1294 | .unlocked_ioctl = kvm_vcpu_ioctl, | |
1295 | .compat_ioctl = kvm_vcpu_ioctl, | |
9a2bb7f4 | 1296 | .mmap = kvm_vcpu_mmap, |
bccf2150 AK |
1297 | }; |
1298 | ||
1299 | /* | |
1300 | * Allocates an inode for the vcpu. | |
1301 | */ | |
1302 | static int create_vcpu_fd(struct kvm_vcpu *vcpu) | |
1303 | { | |
628ff7c1 | 1304 | return anon_inode_getfd("kvm-vcpu", &kvm_vcpu_fops, vcpu, O_RDWR); |
bccf2150 AK |
1305 | } |
1306 | ||
c5ea7660 AK |
1307 | /* |
1308 | * Creates some virtual cpus. Good luck creating more than one. | |
1309 | */ | |
73880c80 | 1310 | static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, u32 id) |
c5ea7660 AK |
1311 | { |
1312 | int r; | |
988a2cae | 1313 | struct kvm_vcpu *vcpu, *v; |
c5ea7660 | 1314 | |
73880c80 | 1315 | vcpu = kvm_arch_vcpu_create(kvm, id); |
fb3f0f51 RR |
1316 | if (IS_ERR(vcpu)) |
1317 | return PTR_ERR(vcpu); | |
c5ea7660 | 1318 | |
15ad7146 AK |
1319 | preempt_notifier_init(&vcpu->preempt_notifier, &kvm_preempt_ops); |
1320 | ||
26e5215f AK |
1321 | r = kvm_arch_vcpu_setup(vcpu); |
1322 | if (r) | |
7d8fece6 | 1323 | return r; |
26e5215f | 1324 | |
11ec2804 | 1325 | mutex_lock(&kvm->lock); |
73880c80 GN |
1326 | if (atomic_read(&kvm->online_vcpus) == KVM_MAX_VCPUS) { |
1327 | r = -EINVAL; | |
e9b11c17 | 1328 | goto vcpu_destroy; |
fb3f0f51 | 1329 | } |
73880c80 | 1330 | |
988a2cae GN |
1331 | kvm_for_each_vcpu(r, v, kvm) |
1332 | if (v->vcpu_id == id) { | |
73880c80 GN |
1333 | r = -EEXIST; |
1334 | goto vcpu_destroy; | |
1335 | } | |
1336 | ||
1337 | BUG_ON(kvm->vcpus[atomic_read(&kvm->online_vcpus)]); | |
c5ea7660 | 1338 | |
fb3f0f51 | 1339 | /* Now it's all set up, let userspace reach it */ |
66c0b394 | 1340 | kvm_get_kvm(kvm); |
bccf2150 | 1341 | r = create_vcpu_fd(vcpu); |
73880c80 GN |
1342 | if (r < 0) { |
1343 | kvm_put_kvm(kvm); | |
1344 | goto vcpu_destroy; | |
1345 | } | |
1346 | ||
1347 | kvm->vcpus[atomic_read(&kvm->online_vcpus)] = vcpu; | |
1348 | smp_wmb(); | |
1349 | atomic_inc(&kvm->online_vcpus); | |
1350 | ||
1351 | #ifdef CONFIG_KVM_APIC_ARCHITECTURE | |
1352 | if (kvm->bsp_vcpu_id == id) | |
1353 | kvm->bsp_vcpu = vcpu; | |
1354 | #endif | |
1355 | mutex_unlock(&kvm->lock); | |
fb3f0f51 | 1356 | return r; |
39c3b86e | 1357 | |
e9b11c17 | 1358 | vcpu_destroy: |
7d8fece6 | 1359 | mutex_unlock(&kvm->lock); |
d40ccc62 | 1360 | kvm_arch_vcpu_destroy(vcpu); |
c5ea7660 AK |
1361 | return r; |
1362 | } | |
1363 | ||
1961d276 AK |
1364 | static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu *vcpu, sigset_t *sigset) |
1365 | { | |
1366 | if (sigset) { | |
1367 | sigdelsetmask(sigset, sigmask(SIGKILL)|sigmask(SIGSTOP)); | |
1368 | vcpu->sigset_active = 1; | |
1369 | vcpu->sigset = *sigset; | |
1370 | } else | |
1371 | vcpu->sigset_active = 0; | |
1372 | return 0; | |
1373 | } | |
1374 | ||
bccf2150 AK |
1375 | static long kvm_vcpu_ioctl(struct file *filp, |
1376 | unsigned int ioctl, unsigned long arg) | |
6aa8b732 | 1377 | { |
bccf2150 | 1378 | struct kvm_vcpu *vcpu = filp->private_data; |
2f366987 | 1379 | void __user *argp = (void __user *)arg; |
313a3dc7 | 1380 | int r; |
fa3795a7 DH |
1381 | struct kvm_fpu *fpu = NULL; |
1382 | struct kvm_sregs *kvm_sregs = NULL; | |
6aa8b732 | 1383 | |
6d4e4c4f AK |
1384 | if (vcpu->kvm->mm != current->mm) |
1385 | return -EIO; | |
2122ff5e AK |
1386 | |
1387 | #if defined(CONFIG_S390) || defined(CONFIG_PPC) | |
1388 | /* | |
1389 | * Special cases: vcpu ioctls that are asynchronous to vcpu execution, | |
1390 | * so vcpu_load() would break it. | |
1391 | */ | |
1392 | if (ioctl == KVM_S390_INTERRUPT || ioctl == KVM_INTERRUPT) | |
1393 | return kvm_arch_vcpu_ioctl(filp, ioctl, arg); | |
1394 | #endif | |
1395 | ||
1396 | ||
1397 | vcpu_load(vcpu); | |
6aa8b732 | 1398 | switch (ioctl) { |
9a2bb7f4 | 1399 | case KVM_RUN: |
f0fe5108 AK |
1400 | r = -EINVAL; |
1401 | if (arg) | |
1402 | goto out; | |
b6c7a5dc | 1403 | r = kvm_arch_vcpu_ioctl_run(vcpu, vcpu->run); |
6aa8b732 | 1404 | break; |
6aa8b732 | 1405 | case KVM_GET_REGS: { |
3e4bb3ac | 1406 | struct kvm_regs *kvm_regs; |
6aa8b732 | 1407 | |
3e4bb3ac XZ |
1408 | r = -ENOMEM; |
1409 | kvm_regs = kzalloc(sizeof(struct kvm_regs), GFP_KERNEL); | |
1410 | if (!kvm_regs) | |
6aa8b732 | 1411 | goto out; |
3e4bb3ac XZ |
1412 | r = kvm_arch_vcpu_ioctl_get_regs(vcpu, kvm_regs); |
1413 | if (r) | |
1414 | goto out_free1; | |
6aa8b732 | 1415 | r = -EFAULT; |
3e4bb3ac XZ |
1416 | if (copy_to_user(argp, kvm_regs, sizeof(struct kvm_regs))) |
1417 | goto out_free1; | |
6aa8b732 | 1418 | r = 0; |
3e4bb3ac XZ |
1419 | out_free1: |
1420 | kfree(kvm_regs); | |
6aa8b732 AK |
1421 | break; |
1422 | } | |
1423 | case KVM_SET_REGS: { | |
3e4bb3ac | 1424 | struct kvm_regs *kvm_regs; |
6aa8b732 | 1425 | |
3e4bb3ac XZ |
1426 | r = -ENOMEM; |
1427 | kvm_regs = kzalloc(sizeof(struct kvm_regs), GFP_KERNEL); | |
1428 | if (!kvm_regs) | |
6aa8b732 | 1429 | goto out; |
3e4bb3ac XZ |
1430 | r = -EFAULT; |
1431 | if (copy_from_user(kvm_regs, argp, sizeof(struct kvm_regs))) | |
1432 | goto out_free2; | |
1433 | r = kvm_arch_vcpu_ioctl_set_regs(vcpu, kvm_regs); | |
6aa8b732 | 1434 | if (r) |
3e4bb3ac | 1435 | goto out_free2; |
6aa8b732 | 1436 | r = 0; |
3e4bb3ac XZ |
1437 | out_free2: |
1438 | kfree(kvm_regs); | |
6aa8b732 AK |
1439 | break; |
1440 | } | |
1441 | case KVM_GET_SREGS: { | |
fa3795a7 DH |
1442 | kvm_sregs = kzalloc(sizeof(struct kvm_sregs), GFP_KERNEL); |
1443 | r = -ENOMEM; | |
1444 | if (!kvm_sregs) | |
1445 | goto out; | |
1446 | r = kvm_arch_vcpu_ioctl_get_sregs(vcpu, kvm_sregs); | |
6aa8b732 AK |
1447 | if (r) |
1448 | goto out; | |
1449 | r = -EFAULT; | |
fa3795a7 | 1450 | if (copy_to_user(argp, kvm_sregs, sizeof(struct kvm_sregs))) |
6aa8b732 AK |
1451 | goto out; |
1452 | r = 0; | |
1453 | break; | |
1454 | } | |
1455 | case KVM_SET_SREGS: { | |
fa3795a7 DH |
1456 | kvm_sregs = kmalloc(sizeof(struct kvm_sregs), GFP_KERNEL); |
1457 | r = -ENOMEM; | |
1458 | if (!kvm_sregs) | |
1459 | goto out; | |
6aa8b732 | 1460 | r = -EFAULT; |
fa3795a7 | 1461 | if (copy_from_user(kvm_sregs, argp, sizeof(struct kvm_sregs))) |
6aa8b732 | 1462 | goto out; |
fa3795a7 | 1463 | r = kvm_arch_vcpu_ioctl_set_sregs(vcpu, kvm_sregs); |
6aa8b732 AK |
1464 | if (r) |
1465 | goto out; | |
1466 | r = 0; | |
1467 | break; | |
1468 | } | |
62d9f0db MT |
1469 | case KVM_GET_MP_STATE: { |
1470 | struct kvm_mp_state mp_state; | |
1471 | ||
1472 | r = kvm_arch_vcpu_ioctl_get_mpstate(vcpu, &mp_state); | |
1473 | if (r) | |
1474 | goto out; | |
1475 | r = -EFAULT; | |
1476 | if (copy_to_user(argp, &mp_state, sizeof mp_state)) | |
1477 | goto out; | |
1478 | r = 0; | |
1479 | break; | |
1480 | } | |
1481 | case KVM_SET_MP_STATE: { | |
1482 | struct kvm_mp_state mp_state; | |
1483 | ||
1484 | r = -EFAULT; | |
1485 | if (copy_from_user(&mp_state, argp, sizeof mp_state)) | |
1486 | goto out; | |
1487 | r = kvm_arch_vcpu_ioctl_set_mpstate(vcpu, &mp_state); | |
1488 | if (r) | |
1489 | goto out; | |
1490 | r = 0; | |
1491 | break; | |
1492 | } | |
6aa8b732 AK |
1493 | case KVM_TRANSLATE: { |
1494 | struct kvm_translation tr; | |
1495 | ||
1496 | r = -EFAULT; | |
2f366987 | 1497 | if (copy_from_user(&tr, argp, sizeof tr)) |
6aa8b732 | 1498 | goto out; |
8b006791 | 1499 | r = kvm_arch_vcpu_ioctl_translate(vcpu, &tr); |
6aa8b732 AK |
1500 | if (r) |
1501 | goto out; | |
1502 | r = -EFAULT; | |
2f366987 | 1503 | if (copy_to_user(argp, &tr, sizeof tr)) |
6aa8b732 AK |
1504 | goto out; |
1505 | r = 0; | |
1506 | break; | |
1507 | } | |
d0bfb940 JK |
1508 | case KVM_SET_GUEST_DEBUG: { |
1509 | struct kvm_guest_debug dbg; | |
6aa8b732 AK |
1510 | |
1511 | r = -EFAULT; | |
2f366987 | 1512 | if (copy_from_user(&dbg, argp, sizeof dbg)) |
6aa8b732 | 1513 | goto out; |
d0bfb940 | 1514 | r = kvm_arch_vcpu_ioctl_set_guest_debug(vcpu, &dbg); |
6aa8b732 AK |
1515 | if (r) |
1516 | goto out; | |
1517 | r = 0; | |
1518 | break; | |
1519 | } | |
1961d276 AK |
1520 | case KVM_SET_SIGNAL_MASK: { |
1521 | struct kvm_signal_mask __user *sigmask_arg = argp; | |
1522 | struct kvm_signal_mask kvm_sigmask; | |
1523 | sigset_t sigset, *p; | |
1524 | ||
1525 | p = NULL; | |
1526 | if (argp) { | |
1527 | r = -EFAULT; | |
1528 | if (copy_from_user(&kvm_sigmask, argp, | |
1529 | sizeof kvm_sigmask)) | |
1530 | goto out; | |
1531 | r = -EINVAL; | |
1532 | if (kvm_sigmask.len != sizeof sigset) | |
1533 | goto out; | |
1534 | r = -EFAULT; | |
1535 | if (copy_from_user(&sigset, sigmask_arg->sigset, | |
1536 | sizeof sigset)) | |
1537 | goto out; | |
1538 | p = &sigset; | |
1539 | } | |
376d41ff | 1540 | r = kvm_vcpu_ioctl_set_sigmask(vcpu, p); |
1961d276 AK |
1541 | break; |
1542 | } | |
b8836737 | 1543 | case KVM_GET_FPU: { |
fa3795a7 DH |
1544 | fpu = kzalloc(sizeof(struct kvm_fpu), GFP_KERNEL); |
1545 | r = -ENOMEM; | |
1546 | if (!fpu) | |
1547 | goto out; | |
1548 | r = kvm_arch_vcpu_ioctl_get_fpu(vcpu, fpu); | |
b8836737 AK |
1549 | if (r) |
1550 | goto out; | |
1551 | r = -EFAULT; | |
fa3795a7 | 1552 | if (copy_to_user(argp, fpu, sizeof(struct kvm_fpu))) |
b8836737 AK |
1553 | goto out; |
1554 | r = 0; | |
1555 | break; | |
1556 | } | |
1557 | case KVM_SET_FPU: { | |
fa3795a7 DH |
1558 | fpu = kmalloc(sizeof(struct kvm_fpu), GFP_KERNEL); |
1559 | r = -ENOMEM; | |
1560 | if (!fpu) | |
1561 | goto out; | |
b8836737 | 1562 | r = -EFAULT; |
fa3795a7 | 1563 | if (copy_from_user(fpu, argp, sizeof(struct kvm_fpu))) |
b8836737 | 1564 | goto out; |
fa3795a7 | 1565 | r = kvm_arch_vcpu_ioctl_set_fpu(vcpu, fpu); |
b8836737 AK |
1566 | if (r) |
1567 | goto out; | |
1568 | r = 0; | |
1569 | break; | |
1570 | } | |
bccf2150 | 1571 | default: |
313a3dc7 | 1572 | r = kvm_arch_vcpu_ioctl(filp, ioctl, arg); |
bccf2150 AK |
1573 | } |
1574 | out: | |
2122ff5e | 1575 | vcpu_put(vcpu); |
fa3795a7 DH |
1576 | kfree(fpu); |
1577 | kfree(kvm_sregs); | |
bccf2150 AK |
1578 | return r; |
1579 | } | |
1580 | ||
1581 | static long kvm_vm_ioctl(struct file *filp, | |
1582 | unsigned int ioctl, unsigned long arg) | |
1583 | { | |
1584 | struct kvm *kvm = filp->private_data; | |
1585 | void __user *argp = (void __user *)arg; | |
1fe779f8 | 1586 | int r; |
bccf2150 | 1587 | |
6d4e4c4f AK |
1588 | if (kvm->mm != current->mm) |
1589 | return -EIO; | |
bccf2150 AK |
1590 | switch (ioctl) { |
1591 | case KVM_CREATE_VCPU: | |
1592 | r = kvm_vm_ioctl_create_vcpu(kvm, arg); | |
1593 | if (r < 0) | |
1594 | goto out; | |
1595 | break; | |
6fc138d2 IE |
1596 | case KVM_SET_USER_MEMORY_REGION: { |
1597 | struct kvm_userspace_memory_region kvm_userspace_mem; | |
1598 | ||
1599 | r = -EFAULT; | |
1600 | if (copy_from_user(&kvm_userspace_mem, argp, | |
1601 | sizeof kvm_userspace_mem)) | |
1602 | goto out; | |
1603 | ||
1604 | r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_userspace_mem, 1); | |
6aa8b732 AK |
1605 | if (r) |
1606 | goto out; | |
1607 | break; | |
1608 | } | |
1609 | case KVM_GET_DIRTY_LOG: { | |
1610 | struct kvm_dirty_log log; | |
1611 | ||
1612 | r = -EFAULT; | |
2f366987 | 1613 | if (copy_from_user(&log, argp, sizeof log)) |
6aa8b732 | 1614 | goto out; |
2c6f5df9 | 1615 | r = kvm_vm_ioctl_get_dirty_log(kvm, &log); |
6aa8b732 AK |
1616 | if (r) |
1617 | goto out; | |
1618 | break; | |
1619 | } | |
5f94c174 LV |
1620 | #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET |
1621 | case KVM_REGISTER_COALESCED_MMIO: { | |
1622 | struct kvm_coalesced_mmio_zone zone; | |
1623 | r = -EFAULT; | |
1624 | if (copy_from_user(&zone, argp, sizeof zone)) | |
1625 | goto out; | |
5f94c174 LV |
1626 | r = kvm_vm_ioctl_register_coalesced_mmio(kvm, &zone); |
1627 | if (r) | |
1628 | goto out; | |
1629 | r = 0; | |
1630 | break; | |
1631 | } | |
1632 | case KVM_UNREGISTER_COALESCED_MMIO: { | |
1633 | struct kvm_coalesced_mmio_zone zone; | |
1634 | r = -EFAULT; | |
1635 | if (copy_from_user(&zone, argp, sizeof zone)) | |
1636 | goto out; | |
5f94c174 LV |
1637 | r = kvm_vm_ioctl_unregister_coalesced_mmio(kvm, &zone); |
1638 | if (r) | |
1639 | goto out; | |
1640 | r = 0; | |
1641 | break; | |
1642 | } | |
1643 | #endif | |
721eecbf GH |
1644 | case KVM_IRQFD: { |
1645 | struct kvm_irqfd data; | |
1646 | ||
1647 | r = -EFAULT; | |
1648 | if (copy_from_user(&data, argp, sizeof data)) | |
1649 | goto out; | |
1650 | r = kvm_irqfd(kvm, data.fd, data.gsi, data.flags); | |
1651 | break; | |
1652 | } | |
d34e6b17 GH |
1653 | case KVM_IOEVENTFD: { |
1654 | struct kvm_ioeventfd data; | |
1655 | ||
1656 | r = -EFAULT; | |
1657 | if (copy_from_user(&data, argp, sizeof data)) | |
1658 | goto out; | |
1659 | r = kvm_ioeventfd(kvm, &data); | |
1660 | break; | |
1661 | } | |
73880c80 GN |
1662 | #ifdef CONFIG_KVM_APIC_ARCHITECTURE |
1663 | case KVM_SET_BOOT_CPU_ID: | |
1664 | r = 0; | |
894a9c55 | 1665 | mutex_lock(&kvm->lock); |
73880c80 GN |
1666 | if (atomic_read(&kvm->online_vcpus) != 0) |
1667 | r = -EBUSY; | |
1668 | else | |
1669 | kvm->bsp_vcpu_id = arg; | |
894a9c55 | 1670 | mutex_unlock(&kvm->lock); |
73880c80 GN |
1671 | break; |
1672 | #endif | |
f17abe9a | 1673 | default: |
1fe779f8 | 1674 | r = kvm_arch_vm_ioctl(filp, ioctl, arg); |
bfd99ff5 AK |
1675 | if (r == -ENOTTY) |
1676 | r = kvm_vm_ioctl_assigned_device(kvm, ioctl, arg); | |
f17abe9a AK |
1677 | } |
1678 | out: | |
1679 | return r; | |
1680 | } | |
1681 | ||
6ff5894c AB |
1682 | #ifdef CONFIG_COMPAT |
1683 | struct compat_kvm_dirty_log { | |
1684 | __u32 slot; | |
1685 | __u32 padding1; | |
1686 | union { | |
1687 | compat_uptr_t dirty_bitmap; /* one bit per page */ | |
1688 | __u64 padding2; | |
1689 | }; | |
1690 | }; | |
1691 | ||
1692 | static long kvm_vm_compat_ioctl(struct file *filp, | |
1693 | unsigned int ioctl, unsigned long arg) | |
1694 | { | |
1695 | struct kvm *kvm = filp->private_data; | |
1696 | int r; | |
1697 | ||
1698 | if (kvm->mm != current->mm) | |
1699 | return -EIO; | |
1700 | switch (ioctl) { | |
1701 | case KVM_GET_DIRTY_LOG: { | |
1702 | struct compat_kvm_dirty_log compat_log; | |
1703 | struct kvm_dirty_log log; | |
1704 | ||
1705 | r = -EFAULT; | |
1706 | if (copy_from_user(&compat_log, (void __user *)arg, | |
1707 | sizeof(compat_log))) | |
1708 | goto out; | |
1709 | log.slot = compat_log.slot; | |
1710 | log.padding1 = compat_log.padding1; | |
1711 | log.padding2 = compat_log.padding2; | |
1712 | log.dirty_bitmap = compat_ptr(compat_log.dirty_bitmap); | |
1713 | ||
1714 | r = kvm_vm_ioctl_get_dirty_log(kvm, &log); | |
1715 | if (r) | |
1716 | goto out; | |
1717 | break; | |
1718 | } | |
1719 | default: | |
1720 | r = kvm_vm_ioctl(filp, ioctl, arg); | |
1721 | } | |
1722 | ||
1723 | out: | |
1724 | return r; | |
1725 | } | |
1726 | #endif | |
1727 | ||
e4a533a4 | 1728 | static int kvm_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf) |
f17abe9a | 1729 | { |
777b3f49 MT |
1730 | struct page *page[1]; |
1731 | unsigned long addr; | |
1732 | int npages; | |
1733 | gfn_t gfn = vmf->pgoff; | |
f17abe9a | 1734 | struct kvm *kvm = vma->vm_file->private_data; |
f17abe9a | 1735 | |
777b3f49 MT |
1736 | addr = gfn_to_hva(kvm, gfn); |
1737 | if (kvm_is_error_hva(addr)) | |
e4a533a4 | 1738 | return VM_FAULT_SIGBUS; |
777b3f49 MT |
1739 | |
1740 | npages = get_user_pages(current, current->mm, addr, 1, 1, 0, page, | |
1741 | NULL); | |
1742 | if (unlikely(npages != 1)) | |
e4a533a4 | 1743 | return VM_FAULT_SIGBUS; |
777b3f49 MT |
1744 | |
1745 | vmf->page = page[0]; | |
e4a533a4 | 1746 | return 0; |
f17abe9a AK |
1747 | } |
1748 | ||
f0f37e2f | 1749 | static const struct vm_operations_struct kvm_vm_vm_ops = { |
e4a533a4 | 1750 | .fault = kvm_vm_fault, |
f17abe9a AK |
1751 | }; |
1752 | ||
1753 | static int kvm_vm_mmap(struct file *file, struct vm_area_struct *vma) | |
1754 | { | |
1755 | vma->vm_ops = &kvm_vm_vm_ops; | |
1756 | return 0; | |
1757 | } | |
1758 | ||
3d3aab1b | 1759 | static struct file_operations kvm_vm_fops = { |
f17abe9a AK |
1760 | .release = kvm_vm_release, |
1761 | .unlocked_ioctl = kvm_vm_ioctl, | |
6ff5894c AB |
1762 | #ifdef CONFIG_COMPAT |
1763 | .compat_ioctl = kvm_vm_compat_ioctl, | |
1764 | #endif | |
f17abe9a AK |
1765 | .mmap = kvm_vm_mmap, |
1766 | }; | |
1767 | ||
1768 | static int kvm_dev_ioctl_create_vm(void) | |
1769 | { | |
6ce5a090 | 1770 | int fd, r; |
f17abe9a AK |
1771 | struct kvm *kvm; |
1772 | ||
f17abe9a | 1773 | kvm = kvm_create_vm(); |
d6d28168 AK |
1774 | if (IS_ERR(kvm)) |
1775 | return PTR_ERR(kvm); | |
6ce5a090 TY |
1776 | #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET |
1777 | r = kvm_coalesced_mmio_init(kvm); | |
1778 | if (r < 0) { | |
1779 | kvm_put_kvm(kvm); | |
1780 | return r; | |
1781 | } | |
1782 | #endif | |
628ff7c1 | 1783 | fd = anon_inode_getfd("kvm-vm", &kvm_vm_fops, kvm, O_RDWR); |
2030a42c | 1784 | if (fd < 0) |
66c0b394 | 1785 | kvm_put_kvm(kvm); |
f17abe9a | 1786 | |
f17abe9a | 1787 | return fd; |
f17abe9a AK |
1788 | } |
1789 | ||
1a811b61 AK |
1790 | static long kvm_dev_ioctl_check_extension_generic(long arg) |
1791 | { | |
1792 | switch (arg) { | |
ca9edaee | 1793 | case KVM_CAP_USER_MEMORY: |
1a811b61 | 1794 | case KVM_CAP_DESTROY_MEMORY_REGION_WORKS: |
4cd481f6 | 1795 | case KVM_CAP_JOIN_MEMORY_REGIONS_WORKS: |
73880c80 GN |
1796 | #ifdef CONFIG_KVM_APIC_ARCHITECTURE |
1797 | case KVM_CAP_SET_BOOT_CPU_ID: | |
1798 | #endif | |
a9c7399d | 1799 | case KVM_CAP_INTERNAL_ERROR_DATA: |
1a811b61 | 1800 | return 1; |
399ec807 AK |
1801 | #ifdef CONFIG_HAVE_KVM_IRQCHIP |
1802 | case KVM_CAP_IRQ_ROUTING: | |
36463146 | 1803 | return KVM_MAX_IRQ_ROUTES; |
399ec807 | 1804 | #endif |
1a811b61 AK |
1805 | default: |
1806 | break; | |
1807 | } | |
1808 | return kvm_dev_ioctl_check_extension(arg); | |
1809 | } | |
1810 | ||
f17abe9a AK |
1811 | static long kvm_dev_ioctl(struct file *filp, |
1812 | unsigned int ioctl, unsigned long arg) | |
1813 | { | |
07c45a36 | 1814 | long r = -EINVAL; |
f17abe9a AK |
1815 | |
1816 | switch (ioctl) { | |
1817 | case KVM_GET_API_VERSION: | |
f0fe5108 AK |
1818 | r = -EINVAL; |
1819 | if (arg) | |
1820 | goto out; | |
f17abe9a AK |
1821 | r = KVM_API_VERSION; |
1822 | break; | |
1823 | case KVM_CREATE_VM: | |
f0fe5108 AK |
1824 | r = -EINVAL; |
1825 | if (arg) | |
1826 | goto out; | |
f17abe9a AK |
1827 | r = kvm_dev_ioctl_create_vm(); |
1828 | break; | |
018d00d2 | 1829 | case KVM_CHECK_EXTENSION: |
1a811b61 | 1830 | r = kvm_dev_ioctl_check_extension_generic(arg); |
5d308f45 | 1831 | break; |
07c45a36 AK |
1832 | case KVM_GET_VCPU_MMAP_SIZE: |
1833 | r = -EINVAL; | |
1834 | if (arg) | |
1835 | goto out; | |
adb1ff46 AK |
1836 | r = PAGE_SIZE; /* struct kvm_run */ |
1837 | #ifdef CONFIG_X86 | |
1838 | r += PAGE_SIZE; /* pio data page */ | |
5f94c174 LV |
1839 | #endif |
1840 | #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET | |
1841 | r += PAGE_SIZE; /* coalesced mmio ring page */ | |
adb1ff46 | 1842 | #endif |
07c45a36 | 1843 | break; |
d4c9ff2d FEL |
1844 | case KVM_TRACE_ENABLE: |
1845 | case KVM_TRACE_PAUSE: | |
1846 | case KVM_TRACE_DISABLE: | |
2023a29c | 1847 | r = -EOPNOTSUPP; |
d4c9ff2d | 1848 | break; |
6aa8b732 | 1849 | default: |
043405e1 | 1850 | return kvm_arch_dev_ioctl(filp, ioctl, arg); |
6aa8b732 AK |
1851 | } |
1852 | out: | |
1853 | return r; | |
1854 | } | |
1855 | ||
6aa8b732 | 1856 | static struct file_operations kvm_chardev_ops = { |
6aa8b732 AK |
1857 | .unlocked_ioctl = kvm_dev_ioctl, |
1858 | .compat_ioctl = kvm_dev_ioctl, | |
6aa8b732 AK |
1859 | }; |
1860 | ||
1861 | static struct miscdevice kvm_dev = { | |
bbe4432e | 1862 | KVM_MINOR, |
6aa8b732 AK |
1863 | "kvm", |
1864 | &kvm_chardev_ops, | |
1865 | }; | |
1866 | ||
1b6c0168 AK |
1867 | static void hardware_enable(void *junk) |
1868 | { | |
1869 | int cpu = raw_smp_processor_id(); | |
10474ae8 | 1870 | int r; |
1b6c0168 | 1871 | |
7f59f492 | 1872 | if (cpumask_test_cpu(cpu, cpus_hardware_enabled)) |
1b6c0168 | 1873 | return; |
10474ae8 | 1874 | |
7f59f492 | 1875 | cpumask_set_cpu(cpu, cpus_hardware_enabled); |
10474ae8 AG |
1876 | |
1877 | r = kvm_arch_hardware_enable(NULL); | |
1878 | ||
1879 | if (r) { | |
1880 | cpumask_clear_cpu(cpu, cpus_hardware_enabled); | |
1881 | atomic_inc(&hardware_enable_failed); | |
1882 | printk(KERN_INFO "kvm: enabling virtualization on " | |
1883 | "CPU%d failed\n", cpu); | |
1884 | } | |
1b6c0168 AK |
1885 | } |
1886 | ||
1887 | static void hardware_disable(void *junk) | |
1888 | { | |
1889 | int cpu = raw_smp_processor_id(); | |
1890 | ||
7f59f492 | 1891 | if (!cpumask_test_cpu(cpu, cpus_hardware_enabled)) |
1b6c0168 | 1892 | return; |
7f59f492 | 1893 | cpumask_clear_cpu(cpu, cpus_hardware_enabled); |
e9b11c17 | 1894 | kvm_arch_hardware_disable(NULL); |
1b6c0168 AK |
1895 | } |
1896 | ||
10474ae8 AG |
1897 | static void hardware_disable_all_nolock(void) |
1898 | { | |
1899 | BUG_ON(!kvm_usage_count); | |
1900 | ||
1901 | kvm_usage_count--; | |
1902 | if (!kvm_usage_count) | |
1903 | on_each_cpu(hardware_disable, NULL, 1); | |
1904 | } | |
1905 | ||
1906 | static void hardware_disable_all(void) | |
1907 | { | |
1908 | spin_lock(&kvm_lock); | |
1909 | hardware_disable_all_nolock(); | |
1910 | spin_unlock(&kvm_lock); | |
1911 | } | |
1912 | ||
1913 | static int hardware_enable_all(void) | |
1914 | { | |
1915 | int r = 0; | |
1916 | ||
1917 | spin_lock(&kvm_lock); | |
1918 | ||
1919 | kvm_usage_count++; | |
1920 | if (kvm_usage_count == 1) { | |
1921 | atomic_set(&hardware_enable_failed, 0); | |
1922 | on_each_cpu(hardware_enable, NULL, 1); | |
1923 | ||
1924 | if (atomic_read(&hardware_enable_failed)) { | |
1925 | hardware_disable_all_nolock(); | |
1926 | r = -EBUSY; | |
1927 | } | |
1928 | } | |
1929 | ||
1930 | spin_unlock(&kvm_lock); | |
1931 | ||
1932 | return r; | |
1933 | } | |
1934 | ||
774c47f1 AK |
1935 | static int kvm_cpu_hotplug(struct notifier_block *notifier, unsigned long val, |
1936 | void *v) | |
1937 | { | |
1938 | int cpu = (long)v; | |
1939 | ||
10474ae8 AG |
1940 | if (!kvm_usage_count) |
1941 | return NOTIFY_OK; | |
1942 | ||
1a6f4d7f | 1943 | val &= ~CPU_TASKS_FROZEN; |
774c47f1 | 1944 | switch (val) { |
cec9ad27 | 1945 | case CPU_DYING: |
6ec8a856 AK |
1946 | printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n", |
1947 | cpu); | |
1948 | hardware_disable(NULL); | |
1949 | break; | |
43934a38 JK |
1950 | case CPU_ONLINE: |
1951 | printk(KERN_INFO "kvm: enabling virtualization on CPU%d\n", | |
1952 | cpu); | |
8691e5a8 | 1953 | smp_call_function_single(cpu, hardware_enable, NULL, 1); |
774c47f1 AK |
1954 | break; |
1955 | } | |
1956 | return NOTIFY_OK; | |
1957 | } | |
1958 | ||
4ecac3fd AK |
1959 | |
1960 | asmlinkage void kvm_handle_fault_on_reboot(void) | |
1961 | { | |
1962 | if (kvm_rebooting) | |
1963 | /* spin while reset goes on */ | |
1964 | while (true) | |
1965 | ; | |
1966 | /* Fault while not rebooting. We want the trace. */ | |
1967 | BUG(); | |
1968 | } | |
1969 | EXPORT_SYMBOL_GPL(kvm_handle_fault_on_reboot); | |
1970 | ||
9a2b85c6 | 1971 | static int kvm_reboot(struct notifier_block *notifier, unsigned long val, |
d77c26fc | 1972 | void *v) |
9a2b85c6 | 1973 | { |
8e1c1815 SY |
1974 | /* |
1975 | * Some (well, at least mine) BIOSes hang on reboot if | |
1976 | * in vmx root mode. | |
1977 | * | |
1978 | * And Intel TXT required VMX off for all cpu when system shutdown. | |
1979 | */ | |
1980 | printk(KERN_INFO "kvm: exiting hardware virtualization\n"); | |
1981 | kvm_rebooting = true; | |
1982 | on_each_cpu(hardware_disable, NULL, 1); | |
9a2b85c6 RR |
1983 | return NOTIFY_OK; |
1984 | } | |
1985 | ||
1986 | static struct notifier_block kvm_reboot_notifier = { | |
1987 | .notifier_call = kvm_reboot, | |
1988 | .priority = 0, | |
1989 | }; | |
1990 | ||
e93f8a0f | 1991 | static void kvm_io_bus_destroy(struct kvm_io_bus *bus) |
2eeb2e94 GH |
1992 | { |
1993 | int i; | |
1994 | ||
1995 | for (i = 0; i < bus->dev_count; i++) { | |
1996 | struct kvm_io_device *pos = bus->devs[i]; | |
1997 | ||
1998 | kvm_iodevice_destructor(pos); | |
1999 | } | |
e93f8a0f | 2000 | kfree(bus); |
2eeb2e94 GH |
2001 | } |
2002 | ||
bda9020e | 2003 | /* kvm_io_bus_write - called under kvm->slots_lock */ |
e93f8a0f | 2004 | int kvm_io_bus_write(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr, |
bda9020e | 2005 | int len, const void *val) |
2eeb2e94 GH |
2006 | { |
2007 | int i; | |
90d83dc3 LJ |
2008 | struct kvm_io_bus *bus; |
2009 | ||
2010 | bus = srcu_dereference(kvm->buses[bus_idx], &kvm->srcu); | |
bda9020e MT |
2011 | for (i = 0; i < bus->dev_count; i++) |
2012 | if (!kvm_iodevice_write(bus->devs[i], addr, len, val)) | |
2013 | return 0; | |
2014 | return -EOPNOTSUPP; | |
2015 | } | |
2eeb2e94 | 2016 | |
bda9020e | 2017 | /* kvm_io_bus_read - called under kvm->slots_lock */ |
e93f8a0f MT |
2018 | int kvm_io_bus_read(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr, |
2019 | int len, void *val) | |
bda9020e MT |
2020 | { |
2021 | int i; | |
90d83dc3 | 2022 | struct kvm_io_bus *bus; |
e93f8a0f | 2023 | |
90d83dc3 | 2024 | bus = srcu_dereference(kvm->buses[bus_idx], &kvm->srcu); |
bda9020e MT |
2025 | for (i = 0; i < bus->dev_count; i++) |
2026 | if (!kvm_iodevice_read(bus->devs[i], addr, len, val)) | |
2027 | return 0; | |
2028 | return -EOPNOTSUPP; | |
2eeb2e94 GH |
2029 | } |
2030 | ||
79fac95e | 2031 | /* Caller must hold slots_lock. */ |
e93f8a0f MT |
2032 | int kvm_io_bus_register_dev(struct kvm *kvm, enum kvm_bus bus_idx, |
2033 | struct kvm_io_device *dev) | |
6c474694 | 2034 | { |
e93f8a0f | 2035 | struct kvm_io_bus *new_bus, *bus; |
090b7aff | 2036 | |
e93f8a0f | 2037 | bus = kvm->buses[bus_idx]; |
090b7aff GH |
2038 | if (bus->dev_count > NR_IOBUS_DEVS-1) |
2039 | return -ENOSPC; | |
2eeb2e94 | 2040 | |
e93f8a0f MT |
2041 | new_bus = kzalloc(sizeof(struct kvm_io_bus), GFP_KERNEL); |
2042 | if (!new_bus) | |
2043 | return -ENOMEM; | |
2044 | memcpy(new_bus, bus, sizeof(struct kvm_io_bus)); | |
2045 | new_bus->devs[new_bus->dev_count++] = dev; | |
2046 | rcu_assign_pointer(kvm->buses[bus_idx], new_bus); | |
2047 | synchronize_srcu_expedited(&kvm->srcu); | |
2048 | kfree(bus); | |
090b7aff GH |
2049 | |
2050 | return 0; | |
2051 | } | |
2052 | ||
79fac95e | 2053 | /* Caller must hold slots_lock. */ |
e93f8a0f MT |
2054 | int kvm_io_bus_unregister_dev(struct kvm *kvm, enum kvm_bus bus_idx, |
2055 | struct kvm_io_device *dev) | |
090b7aff | 2056 | { |
e93f8a0f MT |
2057 | int i, r; |
2058 | struct kvm_io_bus *new_bus, *bus; | |
090b7aff | 2059 | |
e93f8a0f MT |
2060 | new_bus = kzalloc(sizeof(struct kvm_io_bus), GFP_KERNEL); |
2061 | if (!new_bus) | |
2062 | return -ENOMEM; | |
090b7aff | 2063 | |
e93f8a0f MT |
2064 | bus = kvm->buses[bus_idx]; |
2065 | memcpy(new_bus, bus, sizeof(struct kvm_io_bus)); | |
2066 | ||
2067 | r = -ENOENT; | |
2068 | for (i = 0; i < new_bus->dev_count; i++) | |
2069 | if (new_bus->devs[i] == dev) { | |
2070 | r = 0; | |
2071 | new_bus->devs[i] = new_bus->devs[--new_bus->dev_count]; | |
090b7aff GH |
2072 | break; |
2073 | } | |
e93f8a0f MT |
2074 | |
2075 | if (r) { | |
2076 | kfree(new_bus); | |
2077 | return r; | |
2078 | } | |
2079 | ||
2080 | rcu_assign_pointer(kvm->buses[bus_idx], new_bus); | |
2081 | synchronize_srcu_expedited(&kvm->srcu); | |
2082 | kfree(bus); | |
2083 | return r; | |
2eeb2e94 GH |
2084 | } |
2085 | ||
774c47f1 AK |
2086 | static struct notifier_block kvm_cpu_notifier = { |
2087 | .notifier_call = kvm_cpu_hotplug, | |
2088 | .priority = 20, /* must be > scheduler priority */ | |
2089 | }; | |
2090 | ||
8b88b099 | 2091 | static int vm_stat_get(void *_offset, u64 *val) |
ba1389b7 AK |
2092 | { |
2093 | unsigned offset = (long)_offset; | |
ba1389b7 AK |
2094 | struct kvm *kvm; |
2095 | ||
8b88b099 | 2096 | *val = 0; |
ba1389b7 AK |
2097 | spin_lock(&kvm_lock); |
2098 | list_for_each_entry(kvm, &vm_list, vm_list) | |
8b88b099 | 2099 | *val += *(u32 *)((void *)kvm + offset); |
ba1389b7 | 2100 | spin_unlock(&kvm_lock); |
8b88b099 | 2101 | return 0; |
ba1389b7 AK |
2102 | } |
2103 | ||
2104 | DEFINE_SIMPLE_ATTRIBUTE(vm_stat_fops, vm_stat_get, NULL, "%llu\n"); | |
2105 | ||
8b88b099 | 2106 | static int vcpu_stat_get(void *_offset, u64 *val) |
1165f5fe AK |
2107 | { |
2108 | unsigned offset = (long)_offset; | |
1165f5fe AK |
2109 | struct kvm *kvm; |
2110 | struct kvm_vcpu *vcpu; | |
2111 | int i; | |
2112 | ||
8b88b099 | 2113 | *val = 0; |
1165f5fe AK |
2114 | spin_lock(&kvm_lock); |
2115 | list_for_each_entry(kvm, &vm_list, vm_list) | |
988a2cae GN |
2116 | kvm_for_each_vcpu(i, vcpu, kvm) |
2117 | *val += *(u32 *)((void *)vcpu + offset); | |
2118 | ||
1165f5fe | 2119 | spin_unlock(&kvm_lock); |
8b88b099 | 2120 | return 0; |
1165f5fe AK |
2121 | } |
2122 | ||
ba1389b7 AK |
2123 | DEFINE_SIMPLE_ATTRIBUTE(vcpu_stat_fops, vcpu_stat_get, NULL, "%llu\n"); |
2124 | ||
828c0950 | 2125 | static const struct file_operations *stat_fops[] = { |
ba1389b7 AK |
2126 | [KVM_STAT_VCPU] = &vcpu_stat_fops, |
2127 | [KVM_STAT_VM] = &vm_stat_fops, | |
2128 | }; | |
1165f5fe | 2129 | |
a16b043c | 2130 | static void kvm_init_debug(void) |
6aa8b732 AK |
2131 | { |
2132 | struct kvm_stats_debugfs_item *p; | |
2133 | ||
76f7c879 | 2134 | kvm_debugfs_dir = debugfs_create_dir("kvm", NULL); |
6aa8b732 | 2135 | for (p = debugfs_entries; p->name; ++p) |
76f7c879 | 2136 | p->dentry = debugfs_create_file(p->name, 0444, kvm_debugfs_dir, |
1165f5fe | 2137 | (void *)(long)p->offset, |
ba1389b7 | 2138 | stat_fops[p->kind]); |
6aa8b732 AK |
2139 | } |
2140 | ||
2141 | static void kvm_exit_debug(void) | |
2142 | { | |
2143 | struct kvm_stats_debugfs_item *p; | |
2144 | ||
2145 | for (p = debugfs_entries; p->name; ++p) | |
2146 | debugfs_remove(p->dentry); | |
76f7c879 | 2147 | debugfs_remove(kvm_debugfs_dir); |
6aa8b732 AK |
2148 | } |
2149 | ||
59ae6c6b AK |
2150 | static int kvm_suspend(struct sys_device *dev, pm_message_t state) |
2151 | { | |
10474ae8 AG |
2152 | if (kvm_usage_count) |
2153 | hardware_disable(NULL); | |
59ae6c6b AK |
2154 | return 0; |
2155 | } | |
2156 | ||
2157 | static int kvm_resume(struct sys_device *dev) | |
2158 | { | |
10474ae8 AG |
2159 | if (kvm_usage_count) |
2160 | hardware_enable(NULL); | |
59ae6c6b AK |
2161 | return 0; |
2162 | } | |
2163 | ||
2164 | static struct sysdev_class kvm_sysdev_class = { | |
af5ca3f4 | 2165 | .name = "kvm", |
59ae6c6b AK |
2166 | .suspend = kvm_suspend, |
2167 | .resume = kvm_resume, | |
2168 | }; | |
2169 | ||
2170 | static struct sys_device kvm_sysdev = { | |
2171 | .id = 0, | |
2172 | .cls = &kvm_sysdev_class, | |
2173 | }; | |
2174 | ||
cea7bb21 | 2175 | struct page *bad_page; |
35149e21 | 2176 | pfn_t bad_pfn; |
6aa8b732 | 2177 | |
15ad7146 AK |
2178 | static inline |
2179 | struct kvm_vcpu *preempt_notifier_to_vcpu(struct preempt_notifier *pn) | |
2180 | { | |
2181 | return container_of(pn, struct kvm_vcpu, preempt_notifier); | |
2182 | } | |
2183 | ||
2184 | static void kvm_sched_in(struct preempt_notifier *pn, int cpu) | |
2185 | { | |
2186 | struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn); | |
2187 | ||
e9b11c17 | 2188 | kvm_arch_vcpu_load(vcpu, cpu); |
15ad7146 AK |
2189 | } |
2190 | ||
2191 | static void kvm_sched_out(struct preempt_notifier *pn, | |
2192 | struct task_struct *next) | |
2193 | { | |
2194 | struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn); | |
2195 | ||
e9b11c17 | 2196 | kvm_arch_vcpu_put(vcpu); |
15ad7146 AK |
2197 | } |
2198 | ||
0ee75bea | 2199 | int kvm_init(void *opaque, unsigned vcpu_size, unsigned vcpu_align, |
c16f862d | 2200 | struct module *module) |
6aa8b732 AK |
2201 | { |
2202 | int r; | |
002c7f7c | 2203 | int cpu; |
6aa8b732 | 2204 | |
f8c16bba ZX |
2205 | r = kvm_arch_init(opaque); |
2206 | if (r) | |
d2308784 | 2207 | goto out_fail; |
cb498ea2 ZX |
2208 | |
2209 | bad_page = alloc_page(GFP_KERNEL | __GFP_ZERO); | |
2210 | ||
2211 | if (bad_page == NULL) { | |
2212 | r = -ENOMEM; | |
2213 | goto out; | |
2214 | } | |
2215 | ||
35149e21 AL |
2216 | bad_pfn = page_to_pfn(bad_page); |
2217 | ||
bf998156 HY |
2218 | hwpoison_page = alloc_page(GFP_KERNEL | __GFP_ZERO); |
2219 | ||
2220 | if (hwpoison_page == NULL) { | |
2221 | r = -ENOMEM; | |
2222 | goto out_free_0; | |
2223 | } | |
2224 | ||
2225 | hwpoison_pfn = page_to_pfn(hwpoison_page); | |
2226 | ||
8437a617 | 2227 | if (!zalloc_cpumask_var(&cpus_hardware_enabled, GFP_KERNEL)) { |
7f59f492 RR |
2228 | r = -ENOMEM; |
2229 | goto out_free_0; | |
2230 | } | |
2231 | ||
e9b11c17 | 2232 | r = kvm_arch_hardware_setup(); |
6aa8b732 | 2233 | if (r < 0) |
7f59f492 | 2234 | goto out_free_0a; |
6aa8b732 | 2235 | |
002c7f7c YS |
2236 | for_each_online_cpu(cpu) { |
2237 | smp_call_function_single(cpu, | |
e9b11c17 | 2238 | kvm_arch_check_processor_compat, |
8691e5a8 | 2239 | &r, 1); |
002c7f7c | 2240 | if (r < 0) |
d2308784 | 2241 | goto out_free_1; |
002c7f7c YS |
2242 | } |
2243 | ||
774c47f1 AK |
2244 | r = register_cpu_notifier(&kvm_cpu_notifier); |
2245 | if (r) | |
d2308784 | 2246 | goto out_free_2; |
6aa8b732 AK |
2247 | register_reboot_notifier(&kvm_reboot_notifier); |
2248 | ||
59ae6c6b AK |
2249 | r = sysdev_class_register(&kvm_sysdev_class); |
2250 | if (r) | |
d2308784 | 2251 | goto out_free_3; |
59ae6c6b AK |
2252 | |
2253 | r = sysdev_register(&kvm_sysdev); | |
2254 | if (r) | |
d2308784 | 2255 | goto out_free_4; |
59ae6c6b | 2256 | |
c16f862d | 2257 | /* A kmem cache lets us meet the alignment requirements of fx_save. */ |
0ee75bea AK |
2258 | if (!vcpu_align) |
2259 | vcpu_align = __alignof__(struct kvm_vcpu); | |
2260 | kvm_vcpu_cache = kmem_cache_create("kvm_vcpu", vcpu_size, vcpu_align, | |
56919c5c | 2261 | 0, NULL); |
c16f862d RR |
2262 | if (!kvm_vcpu_cache) { |
2263 | r = -ENOMEM; | |
d2308784 | 2264 | goto out_free_5; |
c16f862d RR |
2265 | } |
2266 | ||
6aa8b732 | 2267 | kvm_chardev_ops.owner = module; |
3d3aab1b CB |
2268 | kvm_vm_fops.owner = module; |
2269 | kvm_vcpu_fops.owner = module; | |
6aa8b732 AK |
2270 | |
2271 | r = misc_register(&kvm_dev); | |
2272 | if (r) { | |
d77c26fc | 2273 | printk(KERN_ERR "kvm: misc device register failed\n"); |
6aa8b732 AK |
2274 | goto out_free; |
2275 | } | |
2276 | ||
15ad7146 AK |
2277 | kvm_preempt_ops.sched_in = kvm_sched_in; |
2278 | kvm_preempt_ops.sched_out = kvm_sched_out; | |
2279 | ||
0ea4ed8e DW |
2280 | kvm_init_debug(); |
2281 | ||
c7addb90 | 2282 | return 0; |
6aa8b732 AK |
2283 | |
2284 | out_free: | |
c16f862d | 2285 | kmem_cache_destroy(kvm_vcpu_cache); |
d2308784 | 2286 | out_free_5: |
59ae6c6b | 2287 | sysdev_unregister(&kvm_sysdev); |
d2308784 | 2288 | out_free_4: |
59ae6c6b | 2289 | sysdev_class_unregister(&kvm_sysdev_class); |
d2308784 | 2290 | out_free_3: |
6aa8b732 | 2291 | unregister_reboot_notifier(&kvm_reboot_notifier); |
774c47f1 | 2292 | unregister_cpu_notifier(&kvm_cpu_notifier); |
d2308784 | 2293 | out_free_2: |
d2308784 | 2294 | out_free_1: |
e9b11c17 | 2295 | kvm_arch_hardware_unsetup(); |
7f59f492 RR |
2296 | out_free_0a: |
2297 | free_cpumask_var(cpus_hardware_enabled); | |
d2308784 | 2298 | out_free_0: |
bf998156 HY |
2299 | if (hwpoison_page) |
2300 | __free_page(hwpoison_page); | |
d2308784 | 2301 | __free_page(bad_page); |
ca45aaae | 2302 | out: |
f8c16bba | 2303 | kvm_arch_exit(); |
d2308784 | 2304 | out_fail: |
6aa8b732 AK |
2305 | return r; |
2306 | } | |
cb498ea2 | 2307 | EXPORT_SYMBOL_GPL(kvm_init); |
6aa8b732 | 2308 | |
cb498ea2 | 2309 | void kvm_exit(void) |
6aa8b732 | 2310 | { |
0ea4ed8e | 2311 | kvm_exit_debug(); |
6aa8b732 | 2312 | misc_deregister(&kvm_dev); |
c16f862d | 2313 | kmem_cache_destroy(kvm_vcpu_cache); |
59ae6c6b AK |
2314 | sysdev_unregister(&kvm_sysdev); |
2315 | sysdev_class_unregister(&kvm_sysdev_class); | |
6aa8b732 | 2316 | unregister_reboot_notifier(&kvm_reboot_notifier); |
59ae6c6b | 2317 | unregister_cpu_notifier(&kvm_cpu_notifier); |
15c8b6c1 | 2318 | on_each_cpu(hardware_disable, NULL, 1); |
e9b11c17 | 2319 | kvm_arch_hardware_unsetup(); |
f8c16bba | 2320 | kvm_arch_exit(); |
7f59f492 | 2321 | free_cpumask_var(cpus_hardware_enabled); |
bf998156 | 2322 | __free_page(hwpoison_page); |
cea7bb21 | 2323 | __free_page(bad_page); |
6aa8b732 | 2324 | } |
cb498ea2 | 2325 | EXPORT_SYMBOL_GPL(kvm_exit); |