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Commit | Line | Data |
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6aa8b732 AK |
1 | /* |
2 | * Kernel-based Virtual Machine driver for Linux | |
3 | * | |
4 | * This module enables machines with Intel VT-x extensions to run virtual | |
5 | * machines without emulation or binary translation. | |
6 | * | |
7 | * Copyright (C) 2006 Qumranet, Inc. | |
9611c187 | 8 | * Copyright 2010 Red Hat, Inc. and/or its affiliates. |
6aa8b732 AK |
9 | * |
10 | * Authors: | |
11 | * Avi Kivity <avi@qumranet.com> | |
12 | * Yaniv Kamay <yaniv@qumranet.com> | |
13 | * | |
14 | * This work is licensed under the terms of the GNU GPL, version 2. See | |
15 | * the COPYING file in the top-level directory. | |
16 | * | |
17 | */ | |
18 | ||
e2174021 | 19 | #include "iodev.h" |
6aa8b732 | 20 | |
edf88417 | 21 | #include <linux/kvm_host.h> |
6aa8b732 AK |
22 | #include <linux/kvm.h> |
23 | #include <linux/module.h> | |
24 | #include <linux/errno.h> | |
6aa8b732 | 25 | #include <linux/percpu.h> |
6aa8b732 AK |
26 | #include <linux/mm.h> |
27 | #include <linux/miscdevice.h> | |
28 | #include <linux/vmalloc.h> | |
6aa8b732 | 29 | #include <linux/reboot.h> |
6aa8b732 AK |
30 | #include <linux/debugfs.h> |
31 | #include <linux/highmem.h> | |
32 | #include <linux/file.h> | |
fb3600cc | 33 | #include <linux/syscore_ops.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> |
6aa8b732 | 55 | |
5f94c174 | 56 | #include "coalesced_mmio.h" |
af585b92 | 57 | #include "async_pf.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 | ||
e935b837 | 71 | DEFINE_RAW_SPINLOCK(kvm_lock); |
e9b11c17 | 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 | ||
b7c4145b AK |
92 | bool kvm_rebooting; |
93 | EXPORT_SYMBOL_GPL(kvm_rebooting); | |
4ecac3fd | 94 | |
54dee993 MT |
95 | static bool largepages_enabled = true; |
96 | ||
fa7bff8f GN |
97 | static struct page *hwpoison_page; |
98 | static pfn_t hwpoison_pfn; | |
bf998156 | 99 | |
edba23e5 GN |
100 | static struct page *fault_page; |
101 | static pfn_t fault_pfn; | |
102 | ||
c77fb9dc | 103 | inline int kvm_is_mmio_pfn(pfn_t pfn) |
cbff90a7 | 104 | { |
fc5659c8 | 105 | if (pfn_valid(pfn)) { |
22e5c47e | 106 | int reserved; |
936a5fe6 | 107 | struct page *tail = pfn_to_page(pfn); |
22e5c47e AA |
108 | struct page *head = compound_trans_head(tail); |
109 | reserved = PageReserved(head); | |
936a5fe6 | 110 | if (head != tail) { |
936a5fe6 | 111 | /* |
22e5c47e AA |
112 | * "head" is not a dangling pointer |
113 | * (compound_trans_head takes care of that) | |
114 | * but the hugepage may have been splitted | |
115 | * from under us (and we may not hold a | |
116 | * reference count on the head page so it can | |
117 | * be reused before we run PageReferenced), so | |
118 | * we've to check PageTail before returning | |
119 | * what we just read. | |
936a5fe6 | 120 | */ |
22e5c47e AA |
121 | smp_rmb(); |
122 | if (PageTail(tail)) | |
123 | return reserved; | |
936a5fe6 AA |
124 | } |
125 | return PageReserved(tail); | |
fc5659c8 | 126 | } |
cbff90a7 BAY |
127 | |
128 | return true; | |
129 | } | |
130 | ||
bccf2150 AK |
131 | /* |
132 | * Switches to specified vcpu, until a matching vcpu_put() | |
133 | */ | |
313a3dc7 | 134 | void vcpu_load(struct kvm_vcpu *vcpu) |
6aa8b732 | 135 | { |
15ad7146 AK |
136 | int cpu; |
137 | ||
bccf2150 | 138 | mutex_lock(&vcpu->mutex); |
34bb10b7 RR |
139 | if (unlikely(vcpu->pid != current->pids[PIDTYPE_PID].pid)) { |
140 | /* The thread running this VCPU changed. */ | |
141 | struct pid *oldpid = vcpu->pid; | |
142 | struct pid *newpid = get_task_pid(current, PIDTYPE_PID); | |
143 | rcu_assign_pointer(vcpu->pid, newpid); | |
144 | synchronize_rcu(); | |
145 | put_pid(oldpid); | |
146 | } | |
15ad7146 AK |
147 | cpu = get_cpu(); |
148 | preempt_notifier_register(&vcpu->preempt_notifier); | |
313a3dc7 | 149 | kvm_arch_vcpu_load(vcpu, cpu); |
15ad7146 | 150 | put_cpu(); |
6aa8b732 AK |
151 | } |
152 | ||
313a3dc7 | 153 | void vcpu_put(struct kvm_vcpu *vcpu) |
6aa8b732 | 154 | { |
15ad7146 | 155 | preempt_disable(); |
313a3dc7 | 156 | kvm_arch_vcpu_put(vcpu); |
15ad7146 AK |
157 | preempt_notifier_unregister(&vcpu->preempt_notifier); |
158 | preempt_enable(); | |
6aa8b732 AK |
159 | mutex_unlock(&vcpu->mutex); |
160 | } | |
161 | ||
d9e368d6 AK |
162 | static void ack_flush(void *_completed) |
163 | { | |
d9e368d6 AK |
164 | } |
165 | ||
49846896 | 166 | static bool make_all_cpus_request(struct kvm *kvm, unsigned int req) |
d9e368d6 | 167 | { |
597a5f55 | 168 | int i, cpu, me; |
6ef7a1bc RR |
169 | cpumask_var_t cpus; |
170 | bool called = true; | |
d9e368d6 | 171 | struct kvm_vcpu *vcpu; |
d9e368d6 | 172 | |
79f55997 | 173 | zalloc_cpumask_var(&cpus, GFP_ATOMIC); |
6ef7a1bc | 174 | |
3cba4130 | 175 | me = get_cpu(); |
988a2cae | 176 | kvm_for_each_vcpu(i, vcpu, kvm) { |
3cba4130 | 177 | kvm_make_request(req, vcpu); |
d9e368d6 | 178 | cpu = vcpu->cpu; |
6b7e2d09 XG |
179 | |
180 | /* Set ->requests bit before we read ->mode */ | |
181 | smp_mb(); | |
182 | ||
183 | if (cpus != NULL && cpu != -1 && cpu != me && | |
184 | kvm_vcpu_exiting_guest_mode(vcpu) != OUTSIDE_GUEST_MODE) | |
6ef7a1bc | 185 | cpumask_set_cpu(cpu, cpus); |
49846896 | 186 | } |
6ef7a1bc RR |
187 | if (unlikely(cpus == NULL)) |
188 | smp_call_function_many(cpu_online_mask, ack_flush, NULL, 1); | |
189 | else if (!cpumask_empty(cpus)) | |
190 | smp_call_function_many(cpus, ack_flush, NULL, 1); | |
191 | else | |
192 | called = false; | |
3cba4130 | 193 | put_cpu(); |
6ef7a1bc | 194 | free_cpumask_var(cpus); |
49846896 | 195 | return called; |
d9e368d6 AK |
196 | } |
197 | ||
49846896 | 198 | void kvm_flush_remote_tlbs(struct kvm *kvm) |
2e53d63a | 199 | { |
a4ee1ca4 XG |
200 | int dirty_count = kvm->tlbs_dirty; |
201 | ||
202 | smp_mb(); | |
49846896 RR |
203 | if (make_all_cpus_request(kvm, KVM_REQ_TLB_FLUSH)) |
204 | ++kvm->stat.remote_tlb_flush; | |
a4ee1ca4 | 205 | cmpxchg(&kvm->tlbs_dirty, dirty_count, 0); |
2e53d63a MT |
206 | } |
207 | ||
49846896 RR |
208 | void kvm_reload_remote_mmus(struct kvm *kvm) |
209 | { | |
210 | make_all_cpus_request(kvm, KVM_REQ_MMU_RELOAD); | |
211 | } | |
2e53d63a | 212 | |
fb3f0f51 RR |
213 | int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id) |
214 | { | |
215 | struct page *page; | |
216 | int r; | |
217 | ||
218 | mutex_init(&vcpu->mutex); | |
219 | vcpu->cpu = -1; | |
fb3f0f51 RR |
220 | vcpu->kvm = kvm; |
221 | vcpu->vcpu_id = id; | |
34bb10b7 | 222 | vcpu->pid = NULL; |
b6958ce4 | 223 | init_waitqueue_head(&vcpu->wq); |
af585b92 | 224 | kvm_async_pf_vcpu_init(vcpu); |
fb3f0f51 RR |
225 | |
226 | page = alloc_page(GFP_KERNEL | __GFP_ZERO); | |
227 | if (!page) { | |
228 | r = -ENOMEM; | |
229 | goto fail; | |
230 | } | |
231 | vcpu->run = page_address(page); | |
232 | ||
e9b11c17 | 233 | r = kvm_arch_vcpu_init(vcpu); |
fb3f0f51 | 234 | if (r < 0) |
e9b11c17 | 235 | goto fail_free_run; |
fb3f0f51 RR |
236 | return 0; |
237 | ||
fb3f0f51 RR |
238 | fail_free_run: |
239 | free_page((unsigned long)vcpu->run); | |
240 | fail: | |
76fafa5e | 241 | return r; |
fb3f0f51 RR |
242 | } |
243 | EXPORT_SYMBOL_GPL(kvm_vcpu_init); | |
244 | ||
245 | void kvm_vcpu_uninit(struct kvm_vcpu *vcpu) | |
246 | { | |
34bb10b7 | 247 | put_pid(vcpu->pid); |
e9b11c17 | 248 | kvm_arch_vcpu_uninit(vcpu); |
fb3f0f51 RR |
249 | free_page((unsigned long)vcpu->run); |
250 | } | |
251 | EXPORT_SYMBOL_GPL(kvm_vcpu_uninit); | |
252 | ||
e930bffe AA |
253 | #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER) |
254 | static inline struct kvm *mmu_notifier_to_kvm(struct mmu_notifier *mn) | |
255 | { | |
256 | return container_of(mn, struct kvm, mmu_notifier); | |
257 | } | |
258 | ||
259 | static void kvm_mmu_notifier_invalidate_page(struct mmu_notifier *mn, | |
260 | struct mm_struct *mm, | |
261 | unsigned long address) | |
262 | { | |
263 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
bc6678a3 | 264 | int need_tlb_flush, idx; |
e930bffe AA |
265 | |
266 | /* | |
267 | * When ->invalidate_page runs, the linux pte has been zapped | |
268 | * already but the page is still allocated until | |
269 | * ->invalidate_page returns. So if we increase the sequence | |
270 | * here the kvm page fault will notice if the spte can't be | |
271 | * established because the page is going to be freed. If | |
272 | * instead the kvm page fault establishes the spte before | |
273 | * ->invalidate_page runs, kvm_unmap_hva will release it | |
274 | * before returning. | |
275 | * | |
276 | * The sequence increase only need to be seen at spin_unlock | |
277 | * time, and not at spin_lock time. | |
278 | * | |
279 | * Increasing the sequence after the spin_unlock would be | |
280 | * unsafe because the kvm page fault could then establish the | |
281 | * pte after kvm_unmap_hva returned, without noticing the page | |
282 | * is going to be freed. | |
283 | */ | |
bc6678a3 | 284 | idx = srcu_read_lock(&kvm->srcu); |
e930bffe AA |
285 | spin_lock(&kvm->mmu_lock); |
286 | kvm->mmu_notifier_seq++; | |
a4ee1ca4 | 287 | need_tlb_flush = kvm_unmap_hva(kvm, address) | kvm->tlbs_dirty; |
e930bffe | 288 | spin_unlock(&kvm->mmu_lock); |
bc6678a3 | 289 | srcu_read_unlock(&kvm->srcu, idx); |
e930bffe AA |
290 | |
291 | /* we've to flush the tlb before the pages can be freed */ | |
292 | if (need_tlb_flush) | |
293 | kvm_flush_remote_tlbs(kvm); | |
294 | ||
295 | } | |
296 | ||
3da0dd43 IE |
297 | static void kvm_mmu_notifier_change_pte(struct mmu_notifier *mn, |
298 | struct mm_struct *mm, | |
299 | unsigned long address, | |
300 | pte_t pte) | |
301 | { | |
302 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
bc6678a3 | 303 | int idx; |
3da0dd43 | 304 | |
bc6678a3 | 305 | idx = srcu_read_lock(&kvm->srcu); |
3da0dd43 IE |
306 | spin_lock(&kvm->mmu_lock); |
307 | kvm->mmu_notifier_seq++; | |
308 | kvm_set_spte_hva(kvm, address, pte); | |
309 | spin_unlock(&kvm->mmu_lock); | |
bc6678a3 | 310 | srcu_read_unlock(&kvm->srcu, idx); |
3da0dd43 IE |
311 | } |
312 | ||
e930bffe AA |
313 | static void kvm_mmu_notifier_invalidate_range_start(struct mmu_notifier *mn, |
314 | struct mm_struct *mm, | |
315 | unsigned long start, | |
316 | unsigned long end) | |
317 | { | |
318 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
bc6678a3 | 319 | int need_tlb_flush = 0, idx; |
e930bffe | 320 | |
bc6678a3 | 321 | idx = srcu_read_lock(&kvm->srcu); |
e930bffe AA |
322 | spin_lock(&kvm->mmu_lock); |
323 | /* | |
324 | * The count increase must become visible at unlock time as no | |
325 | * spte can be established without taking the mmu_lock and | |
326 | * count is also read inside the mmu_lock critical section. | |
327 | */ | |
328 | kvm->mmu_notifier_count++; | |
329 | for (; start < end; start += PAGE_SIZE) | |
330 | need_tlb_flush |= kvm_unmap_hva(kvm, start); | |
a4ee1ca4 | 331 | need_tlb_flush |= kvm->tlbs_dirty; |
e930bffe | 332 | spin_unlock(&kvm->mmu_lock); |
bc6678a3 | 333 | srcu_read_unlock(&kvm->srcu, idx); |
e930bffe AA |
334 | |
335 | /* we've to flush the tlb before the pages can be freed */ | |
336 | if (need_tlb_flush) | |
337 | kvm_flush_remote_tlbs(kvm); | |
338 | } | |
339 | ||
340 | static void kvm_mmu_notifier_invalidate_range_end(struct mmu_notifier *mn, | |
341 | struct mm_struct *mm, | |
342 | unsigned long start, | |
343 | unsigned long end) | |
344 | { | |
345 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
346 | ||
347 | spin_lock(&kvm->mmu_lock); | |
348 | /* | |
349 | * This sequence increase will notify the kvm page fault that | |
350 | * the page that is going to be mapped in the spte could have | |
351 | * been freed. | |
352 | */ | |
353 | kvm->mmu_notifier_seq++; | |
354 | /* | |
355 | * The above sequence increase must be visible before the | |
356 | * below count decrease but both values are read by the kvm | |
357 | * page fault under mmu_lock spinlock so we don't need to add | |
358 | * a smb_wmb() here in between the two. | |
359 | */ | |
360 | kvm->mmu_notifier_count--; | |
361 | spin_unlock(&kvm->mmu_lock); | |
362 | ||
363 | BUG_ON(kvm->mmu_notifier_count < 0); | |
364 | } | |
365 | ||
366 | static int kvm_mmu_notifier_clear_flush_young(struct mmu_notifier *mn, | |
367 | struct mm_struct *mm, | |
368 | unsigned long address) | |
369 | { | |
370 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
bc6678a3 | 371 | int young, idx; |
e930bffe | 372 | |
bc6678a3 | 373 | idx = srcu_read_lock(&kvm->srcu); |
e930bffe AA |
374 | spin_lock(&kvm->mmu_lock); |
375 | young = kvm_age_hva(kvm, address); | |
376 | spin_unlock(&kvm->mmu_lock); | |
bc6678a3 | 377 | srcu_read_unlock(&kvm->srcu, idx); |
e930bffe AA |
378 | |
379 | if (young) | |
380 | kvm_flush_remote_tlbs(kvm); | |
381 | ||
382 | return young; | |
383 | } | |
384 | ||
8ee53820 AA |
385 | static int kvm_mmu_notifier_test_young(struct mmu_notifier *mn, |
386 | struct mm_struct *mm, | |
387 | unsigned long address) | |
388 | { | |
389 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
390 | int young, idx; | |
391 | ||
392 | idx = srcu_read_lock(&kvm->srcu); | |
393 | spin_lock(&kvm->mmu_lock); | |
394 | young = kvm_test_age_hva(kvm, address); | |
395 | spin_unlock(&kvm->mmu_lock); | |
396 | srcu_read_unlock(&kvm->srcu, idx); | |
397 | ||
398 | return young; | |
399 | } | |
400 | ||
85db06e5 MT |
401 | static void kvm_mmu_notifier_release(struct mmu_notifier *mn, |
402 | struct mm_struct *mm) | |
403 | { | |
404 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
eda2beda LJ |
405 | int idx; |
406 | ||
407 | idx = srcu_read_lock(&kvm->srcu); | |
85db06e5 | 408 | kvm_arch_flush_shadow(kvm); |
eda2beda | 409 | srcu_read_unlock(&kvm->srcu, idx); |
85db06e5 MT |
410 | } |
411 | ||
e930bffe AA |
412 | static const struct mmu_notifier_ops kvm_mmu_notifier_ops = { |
413 | .invalidate_page = kvm_mmu_notifier_invalidate_page, | |
414 | .invalidate_range_start = kvm_mmu_notifier_invalidate_range_start, | |
415 | .invalidate_range_end = kvm_mmu_notifier_invalidate_range_end, | |
416 | .clear_flush_young = kvm_mmu_notifier_clear_flush_young, | |
8ee53820 | 417 | .test_young = kvm_mmu_notifier_test_young, |
3da0dd43 | 418 | .change_pte = kvm_mmu_notifier_change_pte, |
85db06e5 | 419 | .release = kvm_mmu_notifier_release, |
e930bffe | 420 | }; |
4c07b0a4 AK |
421 | |
422 | static int kvm_init_mmu_notifier(struct kvm *kvm) | |
423 | { | |
424 | kvm->mmu_notifier.ops = &kvm_mmu_notifier_ops; | |
425 | return mmu_notifier_register(&kvm->mmu_notifier, current->mm); | |
426 | } | |
427 | ||
428 | #else /* !(CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER) */ | |
429 | ||
430 | static int kvm_init_mmu_notifier(struct kvm *kvm) | |
431 | { | |
432 | return 0; | |
433 | } | |
434 | ||
e930bffe AA |
435 | #endif /* CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER */ |
436 | ||
f17abe9a | 437 | static struct kvm *kvm_create_vm(void) |
6aa8b732 | 438 | { |
d89f5eff JK |
439 | int r, i; |
440 | struct kvm *kvm = kvm_arch_alloc_vm(); | |
6aa8b732 | 441 | |
d89f5eff JK |
442 | if (!kvm) |
443 | return ERR_PTR(-ENOMEM); | |
444 | ||
445 | r = kvm_arch_init_vm(kvm); | |
446 | if (r) | |
447 | goto out_err_nodisable; | |
10474ae8 AG |
448 | |
449 | r = hardware_enable_all(); | |
450 | if (r) | |
451 | goto out_err_nodisable; | |
452 | ||
75858a84 AK |
453 | #ifdef CONFIG_HAVE_KVM_IRQCHIP |
454 | INIT_HLIST_HEAD(&kvm->mask_notifier_list); | |
136bdfee | 455 | INIT_HLIST_HEAD(&kvm->irq_ack_notifier_list); |
75858a84 | 456 | #endif |
6aa8b732 | 457 | |
46a26bf5 MT |
458 | r = -ENOMEM; |
459 | kvm->memslots = kzalloc(sizeof(struct kvm_memslots), GFP_KERNEL); | |
460 | if (!kvm->memslots) | |
57e7fbee | 461 | goto out_err_nosrcu; |
bc6678a3 | 462 | if (init_srcu_struct(&kvm->srcu)) |
57e7fbee | 463 | goto out_err_nosrcu; |
e93f8a0f MT |
464 | for (i = 0; i < KVM_NR_BUSES; i++) { |
465 | kvm->buses[i] = kzalloc(sizeof(struct kvm_io_bus), | |
466 | GFP_KERNEL); | |
57e7fbee | 467 | if (!kvm->buses[i]) |
e93f8a0f | 468 | goto out_err; |
e93f8a0f | 469 | } |
85722cda | 470 | spin_lock_init(&kvm->mmu_lock); |
46a26bf5 | 471 | |
4c07b0a4 | 472 | r = kvm_init_mmu_notifier(kvm); |
57e7fbee | 473 | if (r) |
283d0c65 | 474 | goto out_err; |
e930bffe | 475 | |
6d4e4c4f AK |
476 | kvm->mm = current->mm; |
477 | atomic_inc(&kvm->mm->mm_count); | |
d34e6b17 | 478 | kvm_eventfd_init(kvm); |
11ec2804 | 479 | mutex_init(&kvm->lock); |
60eead79 | 480 | mutex_init(&kvm->irq_lock); |
79fac95e | 481 | mutex_init(&kvm->slots_lock); |
d39f13b0 | 482 | atomic_set(&kvm->users_count, 1); |
e935b837 | 483 | raw_spin_lock(&kvm_lock); |
5e58cfe4 | 484 | list_add(&kvm->vm_list, &vm_list); |
e935b837 | 485 | raw_spin_unlock(&kvm_lock); |
d89f5eff | 486 | |
f17abe9a | 487 | return kvm; |
10474ae8 AG |
488 | |
489 | out_err: | |
57e7fbee JK |
490 | cleanup_srcu_struct(&kvm->srcu); |
491 | out_err_nosrcu: | |
10474ae8 AG |
492 | hardware_disable_all(); |
493 | out_err_nodisable: | |
e93f8a0f MT |
494 | for (i = 0; i < KVM_NR_BUSES; i++) |
495 | kfree(kvm->buses[i]); | |
46a26bf5 | 496 | kfree(kvm->memslots); |
d89f5eff | 497 | kvm_arch_free_vm(kvm); |
10474ae8 | 498 | return ERR_PTR(r); |
f17abe9a AK |
499 | } |
500 | ||
a36a57b1 TY |
501 | static void kvm_destroy_dirty_bitmap(struct kvm_memory_slot *memslot) |
502 | { | |
503 | if (!memslot->dirty_bitmap) | |
504 | return; | |
505 | ||
6f9e5c17 TY |
506 | if (2 * kvm_dirty_bitmap_bytes(memslot) > PAGE_SIZE) |
507 | vfree(memslot->dirty_bitmap_head); | |
508 | else | |
509 | kfree(memslot->dirty_bitmap_head); | |
510 | ||
a36a57b1 | 511 | memslot->dirty_bitmap = NULL; |
515a0127 | 512 | memslot->dirty_bitmap_head = NULL; |
a36a57b1 TY |
513 | } |
514 | ||
6aa8b732 AK |
515 | /* |
516 | * Free any memory in @free but not in @dont. | |
517 | */ | |
518 | static void kvm_free_physmem_slot(struct kvm_memory_slot *free, | |
519 | struct kvm_memory_slot *dont) | |
520 | { | |
ec04b260 JR |
521 | int i; |
522 | ||
290fc38d IE |
523 | if (!dont || free->rmap != dont->rmap) |
524 | vfree(free->rmap); | |
6aa8b732 AK |
525 | |
526 | if (!dont || free->dirty_bitmap != dont->dirty_bitmap) | |
a36a57b1 | 527 | kvm_destroy_dirty_bitmap(free); |
6aa8b732 | 528 | |
ec04b260 JR |
529 | |
530 | for (i = 0; i < KVM_NR_PAGE_SIZES - 1; ++i) { | |
531 | if (!dont || free->lpage_info[i] != dont->lpage_info[i]) { | |
532 | vfree(free->lpage_info[i]); | |
533 | free->lpage_info[i] = NULL; | |
534 | } | |
535 | } | |
05da4558 | 536 | |
6aa8b732 | 537 | free->npages = 0; |
8d4e1288 | 538 | free->rmap = NULL; |
6aa8b732 AK |
539 | } |
540 | ||
d19a9cd2 | 541 | void kvm_free_physmem(struct kvm *kvm) |
6aa8b732 AK |
542 | { |
543 | int i; | |
46a26bf5 MT |
544 | struct kvm_memslots *slots = kvm->memslots; |
545 | ||
546 | for (i = 0; i < slots->nmemslots; ++i) | |
547 | kvm_free_physmem_slot(&slots->memslots[i], NULL); | |
6aa8b732 | 548 | |
46a26bf5 | 549 | kfree(kvm->memslots); |
6aa8b732 AK |
550 | } |
551 | ||
f17abe9a AK |
552 | static void kvm_destroy_vm(struct kvm *kvm) |
553 | { | |
e93f8a0f | 554 | int i; |
6d4e4c4f AK |
555 | struct mm_struct *mm = kvm->mm; |
556 | ||
ad8ba2cd | 557 | kvm_arch_sync_events(kvm); |
e935b837 | 558 | raw_spin_lock(&kvm_lock); |
133de902 | 559 | list_del(&kvm->vm_list); |
e935b837 | 560 | raw_spin_unlock(&kvm_lock); |
399ec807 | 561 | kvm_free_irq_routing(kvm); |
e93f8a0f MT |
562 | for (i = 0; i < KVM_NR_BUSES; i++) |
563 | kvm_io_bus_destroy(kvm->buses[i]); | |
980da6ce | 564 | kvm_coalesced_mmio_free(kvm); |
e930bffe AA |
565 | #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER) |
566 | mmu_notifier_unregister(&kvm->mmu_notifier, kvm->mm); | |
f00be0ca GN |
567 | #else |
568 | kvm_arch_flush_shadow(kvm); | |
5f94c174 | 569 | #endif |
d19a9cd2 | 570 | kvm_arch_destroy_vm(kvm); |
d89f5eff JK |
571 | kvm_free_physmem(kvm); |
572 | cleanup_srcu_struct(&kvm->srcu); | |
573 | kvm_arch_free_vm(kvm); | |
10474ae8 | 574 | hardware_disable_all(); |
6d4e4c4f | 575 | mmdrop(mm); |
f17abe9a AK |
576 | } |
577 | ||
d39f13b0 IE |
578 | void kvm_get_kvm(struct kvm *kvm) |
579 | { | |
580 | atomic_inc(&kvm->users_count); | |
581 | } | |
582 | EXPORT_SYMBOL_GPL(kvm_get_kvm); | |
583 | ||
584 | void kvm_put_kvm(struct kvm *kvm) | |
585 | { | |
586 | if (atomic_dec_and_test(&kvm->users_count)) | |
587 | kvm_destroy_vm(kvm); | |
588 | } | |
589 | EXPORT_SYMBOL_GPL(kvm_put_kvm); | |
590 | ||
591 | ||
f17abe9a AK |
592 | static int kvm_vm_release(struct inode *inode, struct file *filp) |
593 | { | |
594 | struct kvm *kvm = filp->private_data; | |
595 | ||
721eecbf GH |
596 | kvm_irqfd_release(kvm); |
597 | ||
d39f13b0 | 598 | kvm_put_kvm(kvm); |
6aa8b732 AK |
599 | return 0; |
600 | } | |
601 | ||
d48ead8b | 602 | #ifndef CONFIG_S390 |
515a0127 TY |
603 | /* |
604 | * Allocation size is twice as large as the actual dirty bitmap size. | |
605 | * This makes it possible to do double buffering: see x86's | |
606 | * kvm_vm_ioctl_get_dirty_log(). | |
607 | */ | |
a36a57b1 TY |
608 | static int kvm_create_dirty_bitmap(struct kvm_memory_slot *memslot) |
609 | { | |
515a0127 | 610 | unsigned long dirty_bytes = 2 * kvm_dirty_bitmap_bytes(memslot); |
a36a57b1 | 611 | |
6f9e5c17 TY |
612 | if (dirty_bytes > PAGE_SIZE) |
613 | memslot->dirty_bitmap = vzalloc(dirty_bytes); | |
614 | else | |
615 | memslot->dirty_bitmap = kzalloc(dirty_bytes, GFP_KERNEL); | |
616 | ||
a36a57b1 TY |
617 | if (!memslot->dirty_bitmap) |
618 | return -ENOMEM; | |
619 | ||
515a0127 | 620 | memslot->dirty_bitmap_head = memslot->dirty_bitmap; |
a36a57b1 TY |
621 | return 0; |
622 | } | |
d48ead8b | 623 | #endif /* !CONFIG_S390 */ |
a36a57b1 | 624 | |
6aa8b732 AK |
625 | /* |
626 | * Allocate some memory and give it an address in the guest physical address | |
627 | * space. | |
628 | * | |
629 | * Discontiguous memory is allowed, mostly for framebuffers. | |
f78e0e2e | 630 | * |
10589a46 | 631 | * Must be called holding mmap_sem for write. |
6aa8b732 | 632 | */ |
f78e0e2e SY |
633 | int __kvm_set_memory_region(struct kvm *kvm, |
634 | struct kvm_userspace_memory_region *mem, | |
635 | int user_alloc) | |
6aa8b732 | 636 | { |
8234b22e | 637 | int r; |
6aa8b732 | 638 | gfn_t base_gfn; |
28bcb112 HC |
639 | unsigned long npages; |
640 | unsigned long i; | |
6aa8b732 AK |
641 | struct kvm_memory_slot *memslot; |
642 | struct kvm_memory_slot old, new; | |
bc6678a3 | 643 | struct kvm_memslots *slots, *old_memslots; |
6aa8b732 AK |
644 | |
645 | r = -EINVAL; | |
646 | /* General sanity checks */ | |
647 | if (mem->memory_size & (PAGE_SIZE - 1)) | |
648 | goto out; | |
649 | if (mem->guest_phys_addr & (PAGE_SIZE - 1)) | |
650 | goto out; | |
fa3d315a TY |
651 | /* We can read the guest memory with __xxx_user() later on. */ |
652 | if (user_alloc && | |
653 | ((mem->userspace_addr & (PAGE_SIZE - 1)) || | |
654 | !access_ok(VERIFY_WRITE, mem->userspace_addr, mem->memory_size))) | |
78749809 | 655 | goto out; |
e0d62c7f | 656 | if (mem->slot >= KVM_MEMORY_SLOTS + KVM_PRIVATE_MEM_SLOTS) |
6aa8b732 AK |
657 | goto out; |
658 | if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr) | |
659 | goto out; | |
660 | ||
46a26bf5 | 661 | memslot = &kvm->memslots->memslots[mem->slot]; |
6aa8b732 AK |
662 | base_gfn = mem->guest_phys_addr >> PAGE_SHIFT; |
663 | npages = mem->memory_size >> PAGE_SHIFT; | |
664 | ||
660c22c4 TY |
665 | r = -EINVAL; |
666 | if (npages > KVM_MEM_MAX_NR_PAGES) | |
667 | goto out; | |
668 | ||
6aa8b732 AK |
669 | if (!npages) |
670 | mem->flags &= ~KVM_MEM_LOG_DIRTY_PAGES; | |
671 | ||
6aa8b732 AK |
672 | new = old = *memslot; |
673 | ||
e36d96f7 | 674 | new.id = mem->slot; |
6aa8b732 AK |
675 | new.base_gfn = base_gfn; |
676 | new.npages = npages; | |
677 | new.flags = mem->flags; | |
678 | ||
679 | /* Disallow changing a memory slot's size. */ | |
680 | r = -EINVAL; | |
681 | if (npages && old.npages && npages != old.npages) | |
f78e0e2e | 682 | goto out_free; |
6aa8b732 AK |
683 | |
684 | /* Check for overlaps */ | |
685 | r = -EEXIST; | |
686 | for (i = 0; i < KVM_MEMORY_SLOTS; ++i) { | |
46a26bf5 | 687 | struct kvm_memory_slot *s = &kvm->memslots->memslots[i]; |
6aa8b732 | 688 | |
4cd481f6 | 689 | if (s == memslot || !s->npages) |
6aa8b732 AK |
690 | continue; |
691 | if (!((base_gfn + npages <= s->base_gfn) || | |
692 | (base_gfn >= s->base_gfn + s->npages))) | |
f78e0e2e | 693 | goto out_free; |
6aa8b732 | 694 | } |
6aa8b732 | 695 | |
6aa8b732 AK |
696 | /* Free page dirty bitmap if unneeded */ |
697 | if (!(new.flags & KVM_MEM_LOG_DIRTY_PAGES)) | |
8b6d44c7 | 698 | new.dirty_bitmap = NULL; |
6aa8b732 AK |
699 | |
700 | r = -ENOMEM; | |
701 | ||
702 | /* Allocate if a slot is being created */ | |
eff0114a | 703 | #ifndef CONFIG_S390 |
8d4e1288 | 704 | if (npages && !new.rmap) { |
26535037 | 705 | new.rmap = vzalloc(npages * sizeof(*new.rmap)); |
290fc38d IE |
706 | |
707 | if (!new.rmap) | |
f78e0e2e | 708 | goto out_free; |
290fc38d | 709 | |
80b14b5b | 710 | new.user_alloc = user_alloc; |
bc6678a3 | 711 | new.userspace_addr = mem->userspace_addr; |
6aa8b732 | 712 | } |
ec04b260 JR |
713 | if (!npages) |
714 | goto skip_lpage; | |
05da4558 | 715 | |
ec04b260 | 716 | for (i = 0; i < KVM_NR_PAGE_SIZES - 1; ++i) { |
28bcb112 HC |
717 | unsigned long ugfn; |
718 | unsigned long j; | |
719 | int lpages; | |
ec04b260 | 720 | int level = i + 2; |
05da4558 | 721 | |
ec04b260 JR |
722 | /* Avoid unused variable warning if no large pages */ |
723 | (void)level; | |
724 | ||
725 | if (new.lpage_info[i]) | |
726 | continue; | |
727 | ||
82855413 JR |
728 | lpages = 1 + ((base_gfn + npages - 1) |
729 | >> KVM_HPAGE_GFN_SHIFT(level)); | |
730 | lpages -= base_gfn >> KVM_HPAGE_GFN_SHIFT(level); | |
ec04b260 | 731 | |
26535037 | 732 | new.lpage_info[i] = vzalloc(lpages * sizeof(*new.lpage_info[i])); |
ec04b260 JR |
733 | |
734 | if (!new.lpage_info[i]) | |
05da4558 MT |
735 | goto out_free; |
736 | ||
82855413 | 737 | if (base_gfn & (KVM_PAGES_PER_HPAGE(level) - 1)) |
ec04b260 | 738 | new.lpage_info[i][0].write_count = 1; |
82855413 | 739 | if ((base_gfn+npages) & (KVM_PAGES_PER_HPAGE(level) - 1)) |
ec04b260 | 740 | new.lpage_info[i][lpages - 1].write_count = 1; |
ac04527f AK |
741 | ugfn = new.userspace_addr >> PAGE_SHIFT; |
742 | /* | |
743 | * If the gfn and userspace address are not aligned wrt each | |
54dee993 MT |
744 | * other, or if explicitly asked to, disable large page |
745 | * support for this slot | |
ac04527f | 746 | */ |
ec04b260 | 747 | if ((base_gfn ^ ugfn) & (KVM_PAGES_PER_HPAGE(level) - 1) || |
54dee993 | 748 | !largepages_enabled) |
ec04b260 JR |
749 | for (j = 0; j < lpages; ++j) |
750 | new.lpage_info[i][j].write_count = 1; | |
05da4558 | 751 | } |
6aa8b732 | 752 | |
ec04b260 JR |
753 | skip_lpage: |
754 | ||
6aa8b732 AK |
755 | /* Allocate page dirty bitmap if needed */ |
756 | if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) { | |
a36a57b1 | 757 | if (kvm_create_dirty_bitmap(&new) < 0) |
f78e0e2e | 758 | goto out_free; |
bc6678a3 | 759 | /* destroy any largepage mappings for dirty tracking */ |
6aa8b732 | 760 | } |
3eea8437 CB |
761 | #else /* not defined CONFIG_S390 */ |
762 | new.user_alloc = user_alloc; | |
763 | if (user_alloc) | |
764 | new.userspace_addr = mem->userspace_addr; | |
eff0114a | 765 | #endif /* not defined CONFIG_S390 */ |
6aa8b732 | 766 | |
bc6678a3 MT |
767 | if (!npages) { |
768 | r = -ENOMEM; | |
769 | slots = kzalloc(sizeof(struct kvm_memslots), GFP_KERNEL); | |
770 | if (!slots) | |
771 | goto out_free; | |
772 | memcpy(slots, kvm->memslots, sizeof(struct kvm_memslots)); | |
773 | if (mem->slot >= slots->nmemslots) | |
774 | slots->nmemslots = mem->slot + 1; | |
49c7754c | 775 | slots->generation++; |
bc6678a3 MT |
776 | slots->memslots[mem->slot].flags |= KVM_MEMSLOT_INVALID; |
777 | ||
778 | old_memslots = kvm->memslots; | |
779 | rcu_assign_pointer(kvm->memslots, slots); | |
780 | synchronize_srcu_expedited(&kvm->srcu); | |
781 | /* From this point no new shadow pages pointing to a deleted | |
782 | * memslot will be created. | |
783 | * | |
784 | * validation of sp->gfn happens in: | |
785 | * - gfn_to_hva (kvm_read_guest, gfn_to_pfn) | |
786 | * - kvm_is_visible_gfn (mmu_check_roots) | |
787 | */ | |
34d4cb8f | 788 | kvm_arch_flush_shadow(kvm); |
bc6678a3 MT |
789 | kfree(old_memslots); |
790 | } | |
34d4cb8f | 791 | |
f7784b8e MT |
792 | r = kvm_arch_prepare_memory_region(kvm, &new, old, mem, user_alloc); |
793 | if (r) | |
794 | goto out_free; | |
795 | ||
bc6678a3 MT |
796 | /* map the pages in iommu page table */ |
797 | if (npages) { | |
798 | r = kvm_iommu_map_pages(kvm, &new); | |
799 | if (r) | |
800 | goto out_free; | |
801 | } | |
604b38ac | 802 | |
bc6678a3 MT |
803 | r = -ENOMEM; |
804 | slots = kzalloc(sizeof(struct kvm_memslots), GFP_KERNEL); | |
805 | if (!slots) | |
806 | goto out_free; | |
807 | memcpy(slots, kvm->memslots, sizeof(struct kvm_memslots)); | |
808 | if (mem->slot >= slots->nmemslots) | |
809 | slots->nmemslots = mem->slot + 1; | |
49c7754c | 810 | slots->generation++; |
bc6678a3 MT |
811 | |
812 | /* actual memory is freed via old in kvm_free_physmem_slot below */ | |
813 | if (!npages) { | |
814 | new.rmap = NULL; | |
815 | new.dirty_bitmap = NULL; | |
816 | for (i = 0; i < KVM_NR_PAGE_SIZES - 1; ++i) | |
817 | new.lpage_info[i] = NULL; | |
818 | } | |
819 | ||
820 | slots->memslots[mem->slot] = new; | |
821 | old_memslots = kvm->memslots; | |
822 | rcu_assign_pointer(kvm->memslots, slots); | |
823 | synchronize_srcu_expedited(&kvm->srcu); | |
3ad82a7e | 824 | |
f7784b8e | 825 | kvm_arch_commit_memory_region(kvm, mem, old, user_alloc); |
82ce2c96 | 826 | |
bc6678a3 MT |
827 | kvm_free_physmem_slot(&old, &new); |
828 | kfree(old_memslots); | |
829 | ||
6aa8b732 AK |
830 | return 0; |
831 | ||
f78e0e2e | 832 | out_free: |
6aa8b732 AK |
833 | kvm_free_physmem_slot(&new, &old); |
834 | out: | |
835 | return r; | |
210c7c4d IE |
836 | |
837 | } | |
f78e0e2e SY |
838 | EXPORT_SYMBOL_GPL(__kvm_set_memory_region); |
839 | ||
840 | int kvm_set_memory_region(struct kvm *kvm, | |
841 | struct kvm_userspace_memory_region *mem, | |
842 | int user_alloc) | |
843 | { | |
844 | int r; | |
845 | ||
79fac95e | 846 | mutex_lock(&kvm->slots_lock); |
f78e0e2e | 847 | r = __kvm_set_memory_region(kvm, mem, user_alloc); |
79fac95e | 848 | mutex_unlock(&kvm->slots_lock); |
f78e0e2e SY |
849 | return r; |
850 | } | |
210c7c4d IE |
851 | EXPORT_SYMBOL_GPL(kvm_set_memory_region); |
852 | ||
1fe779f8 CO |
853 | int kvm_vm_ioctl_set_memory_region(struct kvm *kvm, |
854 | struct | |
855 | kvm_userspace_memory_region *mem, | |
856 | int user_alloc) | |
210c7c4d | 857 | { |
e0d62c7f IE |
858 | if (mem->slot >= KVM_MEMORY_SLOTS) |
859 | return -EINVAL; | |
210c7c4d | 860 | return kvm_set_memory_region(kvm, mem, user_alloc); |
6aa8b732 AK |
861 | } |
862 | ||
5bb064dc ZX |
863 | int kvm_get_dirty_log(struct kvm *kvm, |
864 | struct kvm_dirty_log *log, int *is_dirty) | |
6aa8b732 AK |
865 | { |
866 | struct kvm_memory_slot *memslot; | |
867 | int r, i; | |
87bf6e7d | 868 | unsigned long n; |
6aa8b732 AK |
869 | unsigned long any = 0; |
870 | ||
6aa8b732 AK |
871 | r = -EINVAL; |
872 | if (log->slot >= KVM_MEMORY_SLOTS) | |
873 | goto out; | |
874 | ||
46a26bf5 | 875 | memslot = &kvm->memslots->memslots[log->slot]; |
6aa8b732 AK |
876 | r = -ENOENT; |
877 | if (!memslot->dirty_bitmap) | |
878 | goto out; | |
879 | ||
87bf6e7d | 880 | n = kvm_dirty_bitmap_bytes(memslot); |
6aa8b732 | 881 | |
cd1a4a98 | 882 | for (i = 0; !any && i < n/sizeof(long); ++i) |
6aa8b732 AK |
883 | any = memslot->dirty_bitmap[i]; |
884 | ||
885 | r = -EFAULT; | |
886 | if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n)) | |
887 | goto out; | |
888 | ||
5bb064dc ZX |
889 | if (any) |
890 | *is_dirty = 1; | |
6aa8b732 AK |
891 | |
892 | r = 0; | |
6aa8b732 | 893 | out: |
6aa8b732 AK |
894 | return r; |
895 | } | |
896 | ||
54dee993 MT |
897 | void kvm_disable_largepages(void) |
898 | { | |
899 | largepages_enabled = false; | |
900 | } | |
901 | EXPORT_SYMBOL_GPL(kvm_disable_largepages); | |
902 | ||
cea7bb21 IE |
903 | int is_error_page(struct page *page) |
904 | { | |
edba23e5 | 905 | return page == bad_page || page == hwpoison_page || page == fault_page; |
cea7bb21 IE |
906 | } |
907 | EXPORT_SYMBOL_GPL(is_error_page); | |
908 | ||
35149e21 AL |
909 | int is_error_pfn(pfn_t pfn) |
910 | { | |
edba23e5 | 911 | return pfn == bad_pfn || pfn == hwpoison_pfn || pfn == fault_pfn; |
35149e21 AL |
912 | } |
913 | EXPORT_SYMBOL_GPL(is_error_pfn); | |
914 | ||
bf998156 HY |
915 | int is_hwpoison_pfn(pfn_t pfn) |
916 | { | |
917 | return pfn == hwpoison_pfn; | |
918 | } | |
919 | EXPORT_SYMBOL_GPL(is_hwpoison_pfn); | |
920 | ||
edba23e5 GN |
921 | int is_fault_pfn(pfn_t pfn) |
922 | { | |
923 | return pfn == fault_pfn; | |
924 | } | |
925 | EXPORT_SYMBOL_GPL(is_fault_pfn); | |
926 | ||
f9d46eb0 IE |
927 | static inline unsigned long bad_hva(void) |
928 | { | |
929 | return PAGE_OFFSET; | |
930 | } | |
931 | ||
932 | int kvm_is_error_hva(unsigned long addr) | |
933 | { | |
934 | return addr == bad_hva(); | |
935 | } | |
936 | EXPORT_SYMBOL_GPL(kvm_is_error_hva); | |
937 | ||
49c7754c GN |
938 | static struct kvm_memory_slot *__gfn_to_memslot(struct kvm_memslots *slots, |
939 | gfn_t gfn) | |
6aa8b732 AK |
940 | { |
941 | int i; | |
942 | ||
46a26bf5 MT |
943 | for (i = 0; i < slots->nmemslots; ++i) { |
944 | struct kvm_memory_slot *memslot = &slots->memslots[i]; | |
6aa8b732 AK |
945 | |
946 | if (gfn >= memslot->base_gfn | |
947 | && gfn < memslot->base_gfn + memslot->npages) | |
948 | return memslot; | |
949 | } | |
8b6d44c7 | 950 | return NULL; |
6aa8b732 | 951 | } |
49c7754c GN |
952 | |
953 | struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn) | |
954 | { | |
955 | return __gfn_to_memslot(kvm_memslots(kvm), gfn); | |
956 | } | |
a1f4d395 | 957 | EXPORT_SYMBOL_GPL(gfn_to_memslot); |
6aa8b732 | 958 | |
e0d62c7f IE |
959 | int kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn) |
960 | { | |
961 | int i; | |
90d83dc3 | 962 | struct kvm_memslots *slots = kvm_memslots(kvm); |
e0d62c7f | 963 | |
e0d62c7f | 964 | for (i = 0; i < KVM_MEMORY_SLOTS; ++i) { |
46a26bf5 | 965 | struct kvm_memory_slot *memslot = &slots->memslots[i]; |
e0d62c7f | 966 | |
bc6678a3 MT |
967 | if (memslot->flags & KVM_MEMSLOT_INVALID) |
968 | continue; | |
969 | ||
e0d62c7f IE |
970 | if (gfn >= memslot->base_gfn |
971 | && gfn < memslot->base_gfn + memslot->npages) | |
972 | return 1; | |
973 | } | |
974 | return 0; | |
975 | } | |
976 | EXPORT_SYMBOL_GPL(kvm_is_visible_gfn); | |
977 | ||
8f0b1ab6 JR |
978 | unsigned long kvm_host_page_size(struct kvm *kvm, gfn_t gfn) |
979 | { | |
980 | struct vm_area_struct *vma; | |
981 | unsigned long addr, size; | |
982 | ||
983 | size = PAGE_SIZE; | |
984 | ||
985 | addr = gfn_to_hva(kvm, gfn); | |
986 | if (kvm_is_error_hva(addr)) | |
987 | return PAGE_SIZE; | |
988 | ||
989 | down_read(¤t->mm->mmap_sem); | |
990 | vma = find_vma(current->mm, addr); | |
991 | if (!vma) | |
992 | goto out; | |
993 | ||
994 | size = vma_kernel_pagesize(vma); | |
995 | ||
996 | out: | |
997 | up_read(¤t->mm->mmap_sem); | |
998 | ||
999 | return size; | |
1000 | } | |
1001 | ||
49c7754c | 1002 | static unsigned long gfn_to_hva_many(struct kvm_memory_slot *slot, gfn_t gfn, |
48987781 | 1003 | gfn_t *nr_pages) |
539cb660 | 1004 | { |
bc6678a3 | 1005 | if (!slot || slot->flags & KVM_MEMSLOT_INVALID) |
539cb660 | 1006 | return bad_hva(); |
48987781 XG |
1007 | |
1008 | if (nr_pages) | |
1009 | *nr_pages = slot->npages - (gfn - slot->base_gfn); | |
1010 | ||
f5c98031 | 1011 | return gfn_to_hva_memslot(slot, gfn); |
539cb660 | 1012 | } |
48987781 XG |
1013 | |
1014 | unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn) | |
1015 | { | |
49c7754c | 1016 | return gfn_to_hva_many(gfn_to_memslot(kvm, gfn), gfn, NULL); |
48987781 | 1017 | } |
0d150298 | 1018 | EXPORT_SYMBOL_GPL(gfn_to_hva); |
539cb660 | 1019 | |
8030089f GN |
1020 | static pfn_t get_fault_pfn(void) |
1021 | { | |
1022 | get_page(fault_page); | |
1023 | return fault_pfn; | |
1024 | } | |
1025 | ||
0857b9e9 GN |
1026 | int get_user_page_nowait(struct task_struct *tsk, struct mm_struct *mm, |
1027 | unsigned long start, int write, struct page **page) | |
1028 | { | |
1029 | int flags = FOLL_TOUCH | FOLL_NOWAIT | FOLL_HWPOISON | FOLL_GET; | |
1030 | ||
1031 | if (write) | |
1032 | flags |= FOLL_WRITE; | |
1033 | ||
1034 | return __get_user_pages(tsk, mm, start, 1, flags, page, NULL, NULL); | |
1035 | } | |
1036 | ||
fafc3dba HY |
1037 | static inline int check_user_page_hwpoison(unsigned long addr) |
1038 | { | |
1039 | int rc, flags = FOLL_TOUCH | FOLL_HWPOISON | FOLL_WRITE; | |
1040 | ||
1041 | rc = __get_user_pages(current, current->mm, addr, 1, | |
1042 | flags, NULL, NULL, NULL); | |
1043 | return rc == -EHWPOISON; | |
1044 | } | |
1045 | ||
af585b92 | 1046 | static pfn_t hva_to_pfn(struct kvm *kvm, unsigned long addr, bool atomic, |
612819c3 | 1047 | bool *async, bool write_fault, bool *writable) |
954bbbc2 | 1048 | { |
8d4e1288 | 1049 | struct page *page[1]; |
af585b92 | 1050 | int npages = 0; |
2e2e3738 | 1051 | pfn_t pfn; |
954bbbc2 | 1052 | |
af585b92 GN |
1053 | /* we can do it either atomically or asynchronously, not both */ |
1054 | BUG_ON(atomic && async); | |
1055 | ||
612819c3 MT |
1056 | BUG_ON(!write_fault && !writable); |
1057 | ||
1058 | if (writable) | |
1059 | *writable = true; | |
1060 | ||
af585b92 | 1061 | if (atomic || async) |
887c08ac | 1062 | npages = __get_user_pages_fast(addr, 1, 1, page); |
af585b92 GN |
1063 | |
1064 | if (unlikely(npages != 1) && !atomic) { | |
887c08ac | 1065 | might_sleep(); |
612819c3 MT |
1066 | |
1067 | if (writable) | |
1068 | *writable = write_fault; | |
1069 | ||
0857b9e9 GN |
1070 | if (async) { |
1071 | down_read(¤t->mm->mmap_sem); | |
1072 | npages = get_user_page_nowait(current, current->mm, | |
1073 | addr, write_fault, page); | |
1074 | up_read(¤t->mm->mmap_sem); | |
1075 | } else | |
1076 | npages = get_user_pages_fast(addr, 1, write_fault, | |
1077 | page); | |
612819c3 MT |
1078 | |
1079 | /* map read fault as writable if possible */ | |
1080 | if (unlikely(!write_fault) && npages == 1) { | |
1081 | struct page *wpage[1]; | |
1082 | ||
1083 | npages = __get_user_pages_fast(addr, 1, 1, wpage); | |
1084 | if (npages == 1) { | |
1085 | *writable = true; | |
1086 | put_page(page[0]); | |
1087 | page[0] = wpage[0]; | |
1088 | } | |
1089 | npages = 1; | |
1090 | } | |
887c08ac | 1091 | } |
539cb660 | 1092 | |
2e2e3738 AL |
1093 | if (unlikely(npages != 1)) { |
1094 | struct vm_area_struct *vma; | |
1095 | ||
887c08ac | 1096 | if (atomic) |
8030089f | 1097 | return get_fault_pfn(); |
887c08ac | 1098 | |
bbeb3406 | 1099 | down_read(¤t->mm->mmap_sem); |
0857b9e9 GN |
1100 | if (npages == -EHWPOISON || |
1101 | (!async && check_user_page_hwpoison(addr))) { | |
bbeb3406 | 1102 | up_read(¤t->mm->mmap_sem); |
bf998156 HY |
1103 | get_page(hwpoison_page); |
1104 | return page_to_pfn(hwpoison_page); | |
1105 | } | |
1106 | ||
8030089f | 1107 | vma = find_vma_intersection(current->mm, addr, addr+1); |
4c2155ce | 1108 | |
8030089f GN |
1109 | if (vma == NULL) |
1110 | pfn = get_fault_pfn(); | |
1111 | else if ((vma->vm_flags & VM_PFNMAP)) { | |
1112 | pfn = ((addr - vma->vm_start) >> PAGE_SHIFT) + | |
1113 | vma->vm_pgoff; | |
1114 | BUG_ON(!kvm_is_mmio_pfn(pfn)); | |
1115 | } else { | |
1116 | if (async && (vma->vm_flags & VM_WRITE)) | |
af585b92 | 1117 | *async = true; |
8030089f | 1118 | pfn = get_fault_pfn(); |
2e2e3738 | 1119 | } |
4c2155ce | 1120 | up_read(¤t->mm->mmap_sem); |
2e2e3738 AL |
1121 | } else |
1122 | pfn = page_to_pfn(page[0]); | |
8d4e1288 | 1123 | |
2e2e3738 | 1124 | return pfn; |
35149e21 AL |
1125 | } |
1126 | ||
887c08ac XG |
1127 | pfn_t hva_to_pfn_atomic(struct kvm *kvm, unsigned long addr) |
1128 | { | |
612819c3 | 1129 | return hva_to_pfn(kvm, addr, true, NULL, true, NULL); |
887c08ac XG |
1130 | } |
1131 | EXPORT_SYMBOL_GPL(hva_to_pfn_atomic); | |
1132 | ||
612819c3 MT |
1133 | static pfn_t __gfn_to_pfn(struct kvm *kvm, gfn_t gfn, bool atomic, bool *async, |
1134 | bool write_fault, bool *writable) | |
506f0d6f MT |
1135 | { |
1136 | unsigned long addr; | |
1137 | ||
af585b92 GN |
1138 | if (async) |
1139 | *async = false; | |
1140 | ||
506f0d6f MT |
1141 | addr = gfn_to_hva(kvm, gfn); |
1142 | if (kvm_is_error_hva(addr)) { | |
1143 | get_page(bad_page); | |
1144 | return page_to_pfn(bad_page); | |
1145 | } | |
1146 | ||
612819c3 | 1147 | return hva_to_pfn(kvm, addr, atomic, async, write_fault, writable); |
365fb3fd XG |
1148 | } |
1149 | ||
1150 | pfn_t gfn_to_pfn_atomic(struct kvm *kvm, gfn_t gfn) | |
1151 | { | |
612819c3 | 1152 | return __gfn_to_pfn(kvm, gfn, true, NULL, true, NULL); |
365fb3fd XG |
1153 | } |
1154 | EXPORT_SYMBOL_GPL(gfn_to_pfn_atomic); | |
1155 | ||
612819c3 MT |
1156 | pfn_t gfn_to_pfn_async(struct kvm *kvm, gfn_t gfn, bool *async, |
1157 | bool write_fault, bool *writable) | |
af585b92 | 1158 | { |
612819c3 | 1159 | return __gfn_to_pfn(kvm, gfn, false, async, write_fault, writable); |
af585b92 GN |
1160 | } |
1161 | EXPORT_SYMBOL_GPL(gfn_to_pfn_async); | |
1162 | ||
365fb3fd XG |
1163 | pfn_t gfn_to_pfn(struct kvm *kvm, gfn_t gfn) |
1164 | { | |
612819c3 | 1165 | return __gfn_to_pfn(kvm, gfn, false, NULL, true, NULL); |
506f0d6f | 1166 | } |
35149e21 AL |
1167 | EXPORT_SYMBOL_GPL(gfn_to_pfn); |
1168 | ||
612819c3 MT |
1169 | pfn_t gfn_to_pfn_prot(struct kvm *kvm, gfn_t gfn, bool write_fault, |
1170 | bool *writable) | |
1171 | { | |
1172 | return __gfn_to_pfn(kvm, gfn, false, NULL, write_fault, writable); | |
1173 | } | |
1174 | EXPORT_SYMBOL_GPL(gfn_to_pfn_prot); | |
1175 | ||
506f0d6f MT |
1176 | pfn_t gfn_to_pfn_memslot(struct kvm *kvm, |
1177 | struct kvm_memory_slot *slot, gfn_t gfn) | |
1178 | { | |
1179 | unsigned long addr = gfn_to_hva_memslot(slot, gfn); | |
612819c3 | 1180 | return hva_to_pfn(kvm, addr, false, NULL, true, NULL); |
506f0d6f MT |
1181 | } |
1182 | ||
48987781 XG |
1183 | int gfn_to_page_many_atomic(struct kvm *kvm, gfn_t gfn, struct page **pages, |
1184 | int nr_pages) | |
1185 | { | |
1186 | unsigned long addr; | |
1187 | gfn_t entry; | |
1188 | ||
49c7754c | 1189 | addr = gfn_to_hva_many(gfn_to_memslot(kvm, gfn), gfn, &entry); |
48987781 XG |
1190 | if (kvm_is_error_hva(addr)) |
1191 | return -1; | |
1192 | ||
1193 | if (entry < nr_pages) | |
1194 | return 0; | |
1195 | ||
1196 | return __get_user_pages_fast(addr, nr_pages, 1, pages); | |
1197 | } | |
1198 | EXPORT_SYMBOL_GPL(gfn_to_page_many_atomic); | |
1199 | ||
35149e21 AL |
1200 | struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn) |
1201 | { | |
2e2e3738 AL |
1202 | pfn_t pfn; |
1203 | ||
1204 | pfn = gfn_to_pfn(kvm, gfn); | |
c77fb9dc | 1205 | if (!kvm_is_mmio_pfn(pfn)) |
2e2e3738 AL |
1206 | return pfn_to_page(pfn); |
1207 | ||
c77fb9dc | 1208 | WARN_ON(kvm_is_mmio_pfn(pfn)); |
2e2e3738 AL |
1209 | |
1210 | get_page(bad_page); | |
1211 | return bad_page; | |
954bbbc2 | 1212 | } |
aab61cc0 | 1213 | |
954bbbc2 AK |
1214 | EXPORT_SYMBOL_GPL(gfn_to_page); |
1215 | ||
b4231d61 IE |
1216 | void kvm_release_page_clean(struct page *page) |
1217 | { | |
35149e21 | 1218 | kvm_release_pfn_clean(page_to_pfn(page)); |
b4231d61 IE |
1219 | } |
1220 | EXPORT_SYMBOL_GPL(kvm_release_page_clean); | |
1221 | ||
35149e21 AL |
1222 | void kvm_release_pfn_clean(pfn_t pfn) |
1223 | { | |
c77fb9dc | 1224 | if (!kvm_is_mmio_pfn(pfn)) |
2e2e3738 | 1225 | put_page(pfn_to_page(pfn)); |
35149e21 AL |
1226 | } |
1227 | EXPORT_SYMBOL_GPL(kvm_release_pfn_clean); | |
1228 | ||
b4231d61 | 1229 | void kvm_release_page_dirty(struct page *page) |
8a7ae055 | 1230 | { |
35149e21 AL |
1231 | kvm_release_pfn_dirty(page_to_pfn(page)); |
1232 | } | |
1233 | EXPORT_SYMBOL_GPL(kvm_release_page_dirty); | |
1234 | ||
1235 | void kvm_release_pfn_dirty(pfn_t pfn) | |
1236 | { | |
1237 | kvm_set_pfn_dirty(pfn); | |
1238 | kvm_release_pfn_clean(pfn); | |
1239 | } | |
1240 | EXPORT_SYMBOL_GPL(kvm_release_pfn_dirty); | |
1241 | ||
1242 | void kvm_set_page_dirty(struct page *page) | |
1243 | { | |
1244 | kvm_set_pfn_dirty(page_to_pfn(page)); | |
1245 | } | |
1246 | EXPORT_SYMBOL_GPL(kvm_set_page_dirty); | |
1247 | ||
1248 | void kvm_set_pfn_dirty(pfn_t pfn) | |
1249 | { | |
c77fb9dc | 1250 | if (!kvm_is_mmio_pfn(pfn)) { |
2e2e3738 AL |
1251 | struct page *page = pfn_to_page(pfn); |
1252 | if (!PageReserved(page)) | |
1253 | SetPageDirty(page); | |
1254 | } | |
8a7ae055 | 1255 | } |
35149e21 AL |
1256 | EXPORT_SYMBOL_GPL(kvm_set_pfn_dirty); |
1257 | ||
1258 | void kvm_set_pfn_accessed(pfn_t pfn) | |
1259 | { | |
c77fb9dc | 1260 | if (!kvm_is_mmio_pfn(pfn)) |
2e2e3738 | 1261 | mark_page_accessed(pfn_to_page(pfn)); |
35149e21 AL |
1262 | } |
1263 | EXPORT_SYMBOL_GPL(kvm_set_pfn_accessed); | |
1264 | ||
1265 | void kvm_get_pfn(pfn_t pfn) | |
1266 | { | |
c77fb9dc | 1267 | if (!kvm_is_mmio_pfn(pfn)) |
2e2e3738 | 1268 | get_page(pfn_to_page(pfn)); |
35149e21 AL |
1269 | } |
1270 | EXPORT_SYMBOL_GPL(kvm_get_pfn); | |
8a7ae055 | 1271 | |
195aefde IE |
1272 | static int next_segment(unsigned long len, int offset) |
1273 | { | |
1274 | if (len > PAGE_SIZE - offset) | |
1275 | return PAGE_SIZE - offset; | |
1276 | else | |
1277 | return len; | |
1278 | } | |
1279 | ||
1280 | int kvm_read_guest_page(struct kvm *kvm, gfn_t gfn, void *data, int offset, | |
1281 | int len) | |
1282 | { | |
e0506bcb IE |
1283 | int r; |
1284 | unsigned long addr; | |
195aefde | 1285 | |
e0506bcb IE |
1286 | addr = gfn_to_hva(kvm, gfn); |
1287 | if (kvm_is_error_hva(addr)) | |
1288 | return -EFAULT; | |
fa3d315a | 1289 | r = __copy_from_user(data, (void __user *)addr + offset, len); |
e0506bcb | 1290 | if (r) |
195aefde | 1291 | return -EFAULT; |
195aefde IE |
1292 | return 0; |
1293 | } | |
1294 | EXPORT_SYMBOL_GPL(kvm_read_guest_page); | |
1295 | ||
1296 | int kvm_read_guest(struct kvm *kvm, gpa_t gpa, void *data, unsigned long len) | |
1297 | { | |
1298 | gfn_t gfn = gpa >> PAGE_SHIFT; | |
1299 | int seg; | |
1300 | int offset = offset_in_page(gpa); | |
1301 | int ret; | |
1302 | ||
1303 | while ((seg = next_segment(len, offset)) != 0) { | |
1304 | ret = kvm_read_guest_page(kvm, gfn, data, offset, seg); | |
1305 | if (ret < 0) | |
1306 | return ret; | |
1307 | offset = 0; | |
1308 | len -= seg; | |
1309 | data += seg; | |
1310 | ++gfn; | |
1311 | } | |
1312 | return 0; | |
1313 | } | |
1314 | EXPORT_SYMBOL_GPL(kvm_read_guest); | |
1315 | ||
7ec54588 MT |
1316 | int kvm_read_guest_atomic(struct kvm *kvm, gpa_t gpa, void *data, |
1317 | unsigned long len) | |
1318 | { | |
1319 | int r; | |
1320 | unsigned long addr; | |
1321 | gfn_t gfn = gpa >> PAGE_SHIFT; | |
1322 | int offset = offset_in_page(gpa); | |
1323 | ||
1324 | addr = gfn_to_hva(kvm, gfn); | |
1325 | if (kvm_is_error_hva(addr)) | |
1326 | return -EFAULT; | |
0aac03f0 | 1327 | pagefault_disable(); |
7ec54588 | 1328 | r = __copy_from_user_inatomic(data, (void __user *)addr + offset, len); |
0aac03f0 | 1329 | pagefault_enable(); |
7ec54588 MT |
1330 | if (r) |
1331 | return -EFAULT; | |
1332 | return 0; | |
1333 | } | |
1334 | EXPORT_SYMBOL(kvm_read_guest_atomic); | |
1335 | ||
195aefde IE |
1336 | int kvm_write_guest_page(struct kvm *kvm, gfn_t gfn, const void *data, |
1337 | int offset, int len) | |
1338 | { | |
e0506bcb IE |
1339 | int r; |
1340 | unsigned long addr; | |
195aefde | 1341 | |
e0506bcb IE |
1342 | addr = gfn_to_hva(kvm, gfn); |
1343 | if (kvm_is_error_hva(addr)) | |
1344 | return -EFAULT; | |
1345 | r = copy_to_user((void __user *)addr + offset, data, len); | |
1346 | if (r) | |
195aefde | 1347 | return -EFAULT; |
195aefde IE |
1348 | mark_page_dirty(kvm, gfn); |
1349 | return 0; | |
1350 | } | |
1351 | EXPORT_SYMBOL_GPL(kvm_write_guest_page); | |
1352 | ||
1353 | int kvm_write_guest(struct kvm *kvm, gpa_t gpa, const void *data, | |
1354 | unsigned long len) | |
1355 | { | |
1356 | gfn_t gfn = gpa >> PAGE_SHIFT; | |
1357 | int seg; | |
1358 | int offset = offset_in_page(gpa); | |
1359 | int ret; | |
1360 | ||
1361 | while ((seg = next_segment(len, offset)) != 0) { | |
1362 | ret = kvm_write_guest_page(kvm, gfn, data, offset, seg); | |
1363 | if (ret < 0) | |
1364 | return ret; | |
1365 | offset = 0; | |
1366 | len -= seg; | |
1367 | data += seg; | |
1368 | ++gfn; | |
1369 | } | |
1370 | return 0; | |
1371 | } | |
1372 | ||
49c7754c GN |
1373 | int kvm_gfn_to_hva_cache_init(struct kvm *kvm, struct gfn_to_hva_cache *ghc, |
1374 | gpa_t gpa) | |
1375 | { | |
1376 | struct kvm_memslots *slots = kvm_memslots(kvm); | |
1377 | int offset = offset_in_page(gpa); | |
1378 | gfn_t gfn = gpa >> PAGE_SHIFT; | |
1379 | ||
1380 | ghc->gpa = gpa; | |
1381 | ghc->generation = slots->generation; | |
1382 | ghc->memslot = __gfn_to_memslot(slots, gfn); | |
1383 | ghc->hva = gfn_to_hva_many(ghc->memslot, gfn, NULL); | |
1384 | if (!kvm_is_error_hva(ghc->hva)) | |
1385 | ghc->hva += offset; | |
1386 | else | |
1387 | return -EFAULT; | |
1388 | ||
1389 | return 0; | |
1390 | } | |
1391 | EXPORT_SYMBOL_GPL(kvm_gfn_to_hva_cache_init); | |
1392 | ||
1393 | int kvm_write_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc, | |
1394 | void *data, unsigned long len) | |
1395 | { | |
1396 | struct kvm_memslots *slots = kvm_memslots(kvm); | |
1397 | int r; | |
1398 | ||
1399 | if (slots->generation != ghc->generation) | |
1400 | kvm_gfn_to_hva_cache_init(kvm, ghc, ghc->gpa); | |
1401 | ||
1402 | if (kvm_is_error_hva(ghc->hva)) | |
1403 | return -EFAULT; | |
1404 | ||
1405 | r = copy_to_user((void __user *)ghc->hva, data, len); | |
1406 | if (r) | |
1407 | return -EFAULT; | |
1408 | mark_page_dirty_in_slot(kvm, ghc->memslot, ghc->gpa >> PAGE_SHIFT); | |
1409 | ||
1410 | return 0; | |
1411 | } | |
1412 | EXPORT_SYMBOL_GPL(kvm_write_guest_cached); | |
1413 | ||
195aefde IE |
1414 | int kvm_clear_guest_page(struct kvm *kvm, gfn_t gfn, int offset, int len) |
1415 | { | |
3bcc8a8c HC |
1416 | return kvm_write_guest_page(kvm, gfn, (const void *) empty_zero_page, |
1417 | offset, len); | |
195aefde IE |
1418 | } |
1419 | EXPORT_SYMBOL_GPL(kvm_clear_guest_page); | |
1420 | ||
1421 | int kvm_clear_guest(struct kvm *kvm, gpa_t gpa, unsigned long len) | |
1422 | { | |
1423 | gfn_t gfn = gpa >> PAGE_SHIFT; | |
1424 | int seg; | |
1425 | int offset = offset_in_page(gpa); | |
1426 | int ret; | |
1427 | ||
1428 | while ((seg = next_segment(len, offset)) != 0) { | |
1429 | ret = kvm_clear_guest_page(kvm, gfn, offset, seg); | |
1430 | if (ret < 0) | |
1431 | return ret; | |
1432 | offset = 0; | |
1433 | len -= seg; | |
1434 | ++gfn; | |
1435 | } | |
1436 | return 0; | |
1437 | } | |
1438 | EXPORT_SYMBOL_GPL(kvm_clear_guest); | |
1439 | ||
49c7754c GN |
1440 | void mark_page_dirty_in_slot(struct kvm *kvm, struct kvm_memory_slot *memslot, |
1441 | gfn_t gfn) | |
6aa8b732 | 1442 | { |
7e9d619d RR |
1443 | if (memslot && memslot->dirty_bitmap) { |
1444 | unsigned long rel_gfn = gfn - memslot->base_gfn; | |
6aa8b732 | 1445 | |
cd7e48c5 | 1446 | __set_bit_le(rel_gfn, memslot->dirty_bitmap); |
6aa8b732 AK |
1447 | } |
1448 | } | |
1449 | ||
49c7754c GN |
1450 | void mark_page_dirty(struct kvm *kvm, gfn_t gfn) |
1451 | { | |
1452 | struct kvm_memory_slot *memslot; | |
1453 | ||
1454 | memslot = gfn_to_memslot(kvm, gfn); | |
1455 | mark_page_dirty_in_slot(kvm, memslot, gfn); | |
1456 | } | |
1457 | ||
b6958ce4 ED |
1458 | /* |
1459 | * The vCPU has executed a HLT instruction with in-kernel mode enabled. | |
1460 | */ | |
8776e519 | 1461 | void kvm_vcpu_block(struct kvm_vcpu *vcpu) |
d3bef15f | 1462 | { |
e5c239cf MT |
1463 | DEFINE_WAIT(wait); |
1464 | ||
1465 | for (;;) { | |
1466 | prepare_to_wait(&vcpu->wq, &wait, TASK_INTERRUPTIBLE); | |
1467 | ||
a1b37100 | 1468 | if (kvm_arch_vcpu_runnable(vcpu)) { |
a8eeb04a | 1469 | kvm_make_request(KVM_REQ_UNHALT, vcpu); |
e5c239cf | 1470 | break; |
d7690175 | 1471 | } |
09cec754 GN |
1472 | if (kvm_cpu_has_pending_timer(vcpu)) |
1473 | break; | |
e5c239cf MT |
1474 | if (signal_pending(current)) |
1475 | break; | |
1476 | ||
b6958ce4 | 1477 | schedule(); |
b6958ce4 | 1478 | } |
d3bef15f | 1479 | |
e5c239cf | 1480 | finish_wait(&vcpu->wq, &wait); |
b6958ce4 ED |
1481 | } |
1482 | ||
6aa8b732 AK |
1483 | void kvm_resched(struct kvm_vcpu *vcpu) |
1484 | { | |
3fca0365 YD |
1485 | if (!need_resched()) |
1486 | return; | |
6aa8b732 | 1487 | cond_resched(); |
6aa8b732 AK |
1488 | } |
1489 | EXPORT_SYMBOL_GPL(kvm_resched); | |
1490 | ||
217ece61 | 1491 | void kvm_vcpu_on_spin(struct kvm_vcpu *me) |
d255f4f2 | 1492 | { |
217ece61 RR |
1493 | struct kvm *kvm = me->kvm; |
1494 | struct kvm_vcpu *vcpu; | |
1495 | int last_boosted_vcpu = me->kvm->last_boosted_vcpu; | |
1496 | int yielded = 0; | |
1497 | int pass; | |
1498 | int i; | |
d255f4f2 | 1499 | |
217ece61 RR |
1500 | /* |
1501 | * We boost the priority of a VCPU that is runnable but not | |
1502 | * currently running, because it got preempted by something | |
1503 | * else and called schedule in __vcpu_run. Hopefully that | |
1504 | * VCPU is holding the lock that we need and will release it. | |
1505 | * We approximate round-robin by starting at the last boosted VCPU. | |
1506 | */ | |
1507 | for (pass = 0; pass < 2 && !yielded; pass++) { | |
1508 | kvm_for_each_vcpu(i, vcpu, kvm) { | |
1509 | struct task_struct *task = NULL; | |
1510 | struct pid *pid; | |
1511 | if (!pass && i < last_boosted_vcpu) { | |
1512 | i = last_boosted_vcpu; | |
1513 | continue; | |
1514 | } else if (pass && i > last_boosted_vcpu) | |
1515 | break; | |
1516 | if (vcpu == me) | |
1517 | continue; | |
1518 | if (waitqueue_active(&vcpu->wq)) | |
1519 | continue; | |
1520 | rcu_read_lock(); | |
1521 | pid = rcu_dereference(vcpu->pid); | |
1522 | if (pid) | |
1523 | task = get_pid_task(vcpu->pid, PIDTYPE_PID); | |
1524 | rcu_read_unlock(); | |
1525 | if (!task) | |
1526 | continue; | |
1527 | if (task->flags & PF_VCPU) { | |
1528 | put_task_struct(task); | |
1529 | continue; | |
1530 | } | |
1531 | if (yield_to(task, 1)) { | |
1532 | put_task_struct(task); | |
1533 | kvm->last_boosted_vcpu = i; | |
1534 | yielded = 1; | |
1535 | break; | |
1536 | } | |
1537 | put_task_struct(task); | |
1538 | } | |
1539 | } | |
d255f4f2 ZE |
1540 | } |
1541 | EXPORT_SYMBOL_GPL(kvm_vcpu_on_spin); | |
1542 | ||
e4a533a4 | 1543 | static int kvm_vcpu_fault(struct vm_area_struct *vma, struct vm_fault *vmf) |
9a2bb7f4 AK |
1544 | { |
1545 | struct kvm_vcpu *vcpu = vma->vm_file->private_data; | |
9a2bb7f4 AK |
1546 | struct page *page; |
1547 | ||
e4a533a4 | 1548 | if (vmf->pgoff == 0) |
039576c0 | 1549 | page = virt_to_page(vcpu->run); |
09566765 | 1550 | #ifdef CONFIG_X86 |
e4a533a4 | 1551 | else if (vmf->pgoff == KVM_PIO_PAGE_OFFSET) |
ad312c7c | 1552 | page = virt_to_page(vcpu->arch.pio_data); |
5f94c174 LV |
1553 | #endif |
1554 | #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET | |
1555 | else if (vmf->pgoff == KVM_COALESCED_MMIO_PAGE_OFFSET) | |
1556 | page = virt_to_page(vcpu->kvm->coalesced_mmio_ring); | |
09566765 | 1557 | #endif |
039576c0 | 1558 | else |
e4a533a4 | 1559 | return VM_FAULT_SIGBUS; |
9a2bb7f4 | 1560 | get_page(page); |
e4a533a4 | 1561 | vmf->page = page; |
1562 | return 0; | |
9a2bb7f4 AK |
1563 | } |
1564 | ||
f0f37e2f | 1565 | static const struct vm_operations_struct kvm_vcpu_vm_ops = { |
e4a533a4 | 1566 | .fault = kvm_vcpu_fault, |
9a2bb7f4 AK |
1567 | }; |
1568 | ||
1569 | static int kvm_vcpu_mmap(struct file *file, struct vm_area_struct *vma) | |
1570 | { | |
1571 | vma->vm_ops = &kvm_vcpu_vm_ops; | |
1572 | return 0; | |
1573 | } | |
1574 | ||
bccf2150 AK |
1575 | static int kvm_vcpu_release(struct inode *inode, struct file *filp) |
1576 | { | |
1577 | struct kvm_vcpu *vcpu = filp->private_data; | |
1578 | ||
66c0b394 | 1579 | kvm_put_kvm(vcpu->kvm); |
bccf2150 AK |
1580 | return 0; |
1581 | } | |
1582 | ||
3d3aab1b | 1583 | static struct file_operations kvm_vcpu_fops = { |
bccf2150 AK |
1584 | .release = kvm_vcpu_release, |
1585 | .unlocked_ioctl = kvm_vcpu_ioctl, | |
1586 | .compat_ioctl = kvm_vcpu_ioctl, | |
9a2bb7f4 | 1587 | .mmap = kvm_vcpu_mmap, |
6038f373 | 1588 | .llseek = noop_llseek, |
bccf2150 AK |
1589 | }; |
1590 | ||
1591 | /* | |
1592 | * Allocates an inode for the vcpu. | |
1593 | */ | |
1594 | static int create_vcpu_fd(struct kvm_vcpu *vcpu) | |
1595 | { | |
628ff7c1 | 1596 | return anon_inode_getfd("kvm-vcpu", &kvm_vcpu_fops, vcpu, O_RDWR); |
bccf2150 AK |
1597 | } |
1598 | ||
c5ea7660 AK |
1599 | /* |
1600 | * Creates some virtual cpus. Good luck creating more than one. | |
1601 | */ | |
73880c80 | 1602 | static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, u32 id) |
c5ea7660 AK |
1603 | { |
1604 | int r; | |
988a2cae | 1605 | struct kvm_vcpu *vcpu, *v; |
c5ea7660 | 1606 | |
73880c80 | 1607 | vcpu = kvm_arch_vcpu_create(kvm, id); |
fb3f0f51 RR |
1608 | if (IS_ERR(vcpu)) |
1609 | return PTR_ERR(vcpu); | |
c5ea7660 | 1610 | |
15ad7146 AK |
1611 | preempt_notifier_init(&vcpu->preempt_notifier, &kvm_preempt_ops); |
1612 | ||
26e5215f AK |
1613 | r = kvm_arch_vcpu_setup(vcpu); |
1614 | if (r) | |
7d8fece6 | 1615 | return r; |
26e5215f | 1616 | |
11ec2804 | 1617 | mutex_lock(&kvm->lock); |
73880c80 GN |
1618 | if (atomic_read(&kvm->online_vcpus) == KVM_MAX_VCPUS) { |
1619 | r = -EINVAL; | |
e9b11c17 | 1620 | goto vcpu_destroy; |
fb3f0f51 | 1621 | } |
73880c80 | 1622 | |
988a2cae GN |
1623 | kvm_for_each_vcpu(r, v, kvm) |
1624 | if (v->vcpu_id == id) { | |
73880c80 GN |
1625 | r = -EEXIST; |
1626 | goto vcpu_destroy; | |
1627 | } | |
1628 | ||
1629 | BUG_ON(kvm->vcpus[atomic_read(&kvm->online_vcpus)]); | |
c5ea7660 | 1630 | |
fb3f0f51 | 1631 | /* Now it's all set up, let userspace reach it */ |
66c0b394 | 1632 | kvm_get_kvm(kvm); |
bccf2150 | 1633 | r = create_vcpu_fd(vcpu); |
73880c80 GN |
1634 | if (r < 0) { |
1635 | kvm_put_kvm(kvm); | |
1636 | goto vcpu_destroy; | |
1637 | } | |
1638 | ||
1639 | kvm->vcpus[atomic_read(&kvm->online_vcpus)] = vcpu; | |
1640 | smp_wmb(); | |
1641 | atomic_inc(&kvm->online_vcpus); | |
1642 | ||
1643 | #ifdef CONFIG_KVM_APIC_ARCHITECTURE | |
1644 | if (kvm->bsp_vcpu_id == id) | |
1645 | kvm->bsp_vcpu = vcpu; | |
1646 | #endif | |
1647 | mutex_unlock(&kvm->lock); | |
fb3f0f51 | 1648 | return r; |
39c3b86e | 1649 | |
e9b11c17 | 1650 | vcpu_destroy: |
7d8fece6 | 1651 | mutex_unlock(&kvm->lock); |
d40ccc62 | 1652 | kvm_arch_vcpu_destroy(vcpu); |
c5ea7660 AK |
1653 | return r; |
1654 | } | |
1655 | ||
1961d276 AK |
1656 | static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu *vcpu, sigset_t *sigset) |
1657 | { | |
1658 | if (sigset) { | |
1659 | sigdelsetmask(sigset, sigmask(SIGKILL)|sigmask(SIGSTOP)); | |
1660 | vcpu->sigset_active = 1; | |
1661 | vcpu->sigset = *sigset; | |
1662 | } else | |
1663 | vcpu->sigset_active = 0; | |
1664 | return 0; | |
1665 | } | |
1666 | ||
bccf2150 AK |
1667 | static long kvm_vcpu_ioctl(struct file *filp, |
1668 | unsigned int ioctl, unsigned long arg) | |
6aa8b732 | 1669 | { |
bccf2150 | 1670 | struct kvm_vcpu *vcpu = filp->private_data; |
2f366987 | 1671 | void __user *argp = (void __user *)arg; |
313a3dc7 | 1672 | int r; |
fa3795a7 DH |
1673 | struct kvm_fpu *fpu = NULL; |
1674 | struct kvm_sregs *kvm_sregs = NULL; | |
6aa8b732 | 1675 | |
6d4e4c4f AK |
1676 | if (vcpu->kvm->mm != current->mm) |
1677 | return -EIO; | |
2122ff5e AK |
1678 | |
1679 | #if defined(CONFIG_S390) || defined(CONFIG_PPC) | |
1680 | /* | |
1681 | * Special cases: vcpu ioctls that are asynchronous to vcpu execution, | |
1682 | * so vcpu_load() would break it. | |
1683 | */ | |
1684 | if (ioctl == KVM_S390_INTERRUPT || ioctl == KVM_INTERRUPT) | |
1685 | return kvm_arch_vcpu_ioctl(filp, ioctl, arg); | |
1686 | #endif | |
1687 | ||
1688 | ||
1689 | vcpu_load(vcpu); | |
6aa8b732 | 1690 | switch (ioctl) { |
9a2bb7f4 | 1691 | case KVM_RUN: |
f0fe5108 AK |
1692 | r = -EINVAL; |
1693 | if (arg) | |
1694 | goto out; | |
b6c7a5dc | 1695 | r = kvm_arch_vcpu_ioctl_run(vcpu, vcpu->run); |
64be5007 | 1696 | trace_kvm_userspace_exit(vcpu->run->exit_reason, r); |
6aa8b732 | 1697 | break; |
6aa8b732 | 1698 | case KVM_GET_REGS: { |
3e4bb3ac | 1699 | struct kvm_regs *kvm_regs; |
6aa8b732 | 1700 | |
3e4bb3ac XZ |
1701 | r = -ENOMEM; |
1702 | kvm_regs = kzalloc(sizeof(struct kvm_regs), GFP_KERNEL); | |
1703 | if (!kvm_regs) | |
6aa8b732 | 1704 | goto out; |
3e4bb3ac XZ |
1705 | r = kvm_arch_vcpu_ioctl_get_regs(vcpu, kvm_regs); |
1706 | if (r) | |
1707 | goto out_free1; | |
6aa8b732 | 1708 | r = -EFAULT; |
3e4bb3ac XZ |
1709 | if (copy_to_user(argp, kvm_regs, sizeof(struct kvm_regs))) |
1710 | goto out_free1; | |
6aa8b732 | 1711 | r = 0; |
3e4bb3ac XZ |
1712 | out_free1: |
1713 | kfree(kvm_regs); | |
6aa8b732 AK |
1714 | break; |
1715 | } | |
1716 | case KVM_SET_REGS: { | |
3e4bb3ac | 1717 | struct kvm_regs *kvm_regs; |
6aa8b732 | 1718 | |
3e4bb3ac XZ |
1719 | r = -ENOMEM; |
1720 | kvm_regs = kzalloc(sizeof(struct kvm_regs), GFP_KERNEL); | |
1721 | if (!kvm_regs) | |
6aa8b732 | 1722 | goto out; |
3e4bb3ac XZ |
1723 | r = -EFAULT; |
1724 | if (copy_from_user(kvm_regs, argp, sizeof(struct kvm_regs))) | |
1725 | goto out_free2; | |
1726 | r = kvm_arch_vcpu_ioctl_set_regs(vcpu, kvm_regs); | |
6aa8b732 | 1727 | if (r) |
3e4bb3ac | 1728 | goto out_free2; |
6aa8b732 | 1729 | r = 0; |
3e4bb3ac XZ |
1730 | out_free2: |
1731 | kfree(kvm_regs); | |
6aa8b732 AK |
1732 | break; |
1733 | } | |
1734 | case KVM_GET_SREGS: { | |
fa3795a7 DH |
1735 | kvm_sregs = kzalloc(sizeof(struct kvm_sregs), GFP_KERNEL); |
1736 | r = -ENOMEM; | |
1737 | if (!kvm_sregs) | |
1738 | goto out; | |
1739 | r = kvm_arch_vcpu_ioctl_get_sregs(vcpu, kvm_sregs); | |
6aa8b732 AK |
1740 | if (r) |
1741 | goto out; | |
1742 | r = -EFAULT; | |
fa3795a7 | 1743 | if (copy_to_user(argp, kvm_sregs, sizeof(struct kvm_sregs))) |
6aa8b732 AK |
1744 | goto out; |
1745 | r = 0; | |
1746 | break; | |
1747 | } | |
1748 | case KVM_SET_SREGS: { | |
fa3795a7 DH |
1749 | kvm_sregs = kmalloc(sizeof(struct kvm_sregs), GFP_KERNEL); |
1750 | r = -ENOMEM; | |
1751 | if (!kvm_sregs) | |
1752 | goto out; | |
6aa8b732 | 1753 | r = -EFAULT; |
fa3795a7 | 1754 | if (copy_from_user(kvm_sregs, argp, sizeof(struct kvm_sregs))) |
6aa8b732 | 1755 | goto out; |
fa3795a7 | 1756 | r = kvm_arch_vcpu_ioctl_set_sregs(vcpu, kvm_sregs); |
6aa8b732 AK |
1757 | if (r) |
1758 | goto out; | |
1759 | r = 0; | |
1760 | break; | |
1761 | } | |
62d9f0db MT |
1762 | case KVM_GET_MP_STATE: { |
1763 | struct kvm_mp_state mp_state; | |
1764 | ||
1765 | r = kvm_arch_vcpu_ioctl_get_mpstate(vcpu, &mp_state); | |
1766 | if (r) | |
1767 | goto out; | |
1768 | r = -EFAULT; | |
1769 | if (copy_to_user(argp, &mp_state, sizeof mp_state)) | |
1770 | goto out; | |
1771 | r = 0; | |
1772 | break; | |
1773 | } | |
1774 | case KVM_SET_MP_STATE: { | |
1775 | struct kvm_mp_state mp_state; | |
1776 | ||
1777 | r = -EFAULT; | |
1778 | if (copy_from_user(&mp_state, argp, sizeof mp_state)) | |
1779 | goto out; | |
1780 | r = kvm_arch_vcpu_ioctl_set_mpstate(vcpu, &mp_state); | |
1781 | if (r) | |
1782 | goto out; | |
1783 | r = 0; | |
1784 | break; | |
1785 | } | |
6aa8b732 AK |
1786 | case KVM_TRANSLATE: { |
1787 | struct kvm_translation tr; | |
1788 | ||
1789 | r = -EFAULT; | |
2f366987 | 1790 | if (copy_from_user(&tr, argp, sizeof tr)) |
6aa8b732 | 1791 | goto out; |
8b006791 | 1792 | r = kvm_arch_vcpu_ioctl_translate(vcpu, &tr); |
6aa8b732 AK |
1793 | if (r) |
1794 | goto out; | |
1795 | r = -EFAULT; | |
2f366987 | 1796 | if (copy_to_user(argp, &tr, sizeof tr)) |
6aa8b732 AK |
1797 | goto out; |
1798 | r = 0; | |
1799 | break; | |
1800 | } | |
d0bfb940 JK |
1801 | case KVM_SET_GUEST_DEBUG: { |
1802 | struct kvm_guest_debug dbg; | |
6aa8b732 AK |
1803 | |
1804 | r = -EFAULT; | |
2f366987 | 1805 | if (copy_from_user(&dbg, argp, sizeof dbg)) |
6aa8b732 | 1806 | goto out; |
d0bfb940 | 1807 | r = kvm_arch_vcpu_ioctl_set_guest_debug(vcpu, &dbg); |
6aa8b732 AK |
1808 | if (r) |
1809 | goto out; | |
1810 | r = 0; | |
1811 | break; | |
1812 | } | |
1961d276 AK |
1813 | case KVM_SET_SIGNAL_MASK: { |
1814 | struct kvm_signal_mask __user *sigmask_arg = argp; | |
1815 | struct kvm_signal_mask kvm_sigmask; | |
1816 | sigset_t sigset, *p; | |
1817 | ||
1818 | p = NULL; | |
1819 | if (argp) { | |
1820 | r = -EFAULT; | |
1821 | if (copy_from_user(&kvm_sigmask, argp, | |
1822 | sizeof kvm_sigmask)) | |
1823 | goto out; | |
1824 | r = -EINVAL; | |
1825 | if (kvm_sigmask.len != sizeof sigset) | |
1826 | goto out; | |
1827 | r = -EFAULT; | |
1828 | if (copy_from_user(&sigset, sigmask_arg->sigset, | |
1829 | sizeof sigset)) | |
1830 | goto out; | |
1831 | p = &sigset; | |
1832 | } | |
376d41ff | 1833 | r = kvm_vcpu_ioctl_set_sigmask(vcpu, p); |
1961d276 AK |
1834 | break; |
1835 | } | |
b8836737 | 1836 | case KVM_GET_FPU: { |
fa3795a7 DH |
1837 | fpu = kzalloc(sizeof(struct kvm_fpu), GFP_KERNEL); |
1838 | r = -ENOMEM; | |
1839 | if (!fpu) | |
1840 | goto out; | |
1841 | r = kvm_arch_vcpu_ioctl_get_fpu(vcpu, fpu); | |
b8836737 AK |
1842 | if (r) |
1843 | goto out; | |
1844 | r = -EFAULT; | |
fa3795a7 | 1845 | if (copy_to_user(argp, fpu, sizeof(struct kvm_fpu))) |
b8836737 AK |
1846 | goto out; |
1847 | r = 0; | |
1848 | break; | |
1849 | } | |
1850 | case KVM_SET_FPU: { | |
fa3795a7 DH |
1851 | fpu = kmalloc(sizeof(struct kvm_fpu), GFP_KERNEL); |
1852 | r = -ENOMEM; | |
1853 | if (!fpu) | |
1854 | goto out; | |
b8836737 | 1855 | r = -EFAULT; |
fa3795a7 | 1856 | if (copy_from_user(fpu, argp, sizeof(struct kvm_fpu))) |
b8836737 | 1857 | goto out; |
fa3795a7 | 1858 | r = kvm_arch_vcpu_ioctl_set_fpu(vcpu, fpu); |
b8836737 AK |
1859 | if (r) |
1860 | goto out; | |
1861 | r = 0; | |
1862 | break; | |
1863 | } | |
bccf2150 | 1864 | default: |
313a3dc7 | 1865 | r = kvm_arch_vcpu_ioctl(filp, ioctl, arg); |
bccf2150 AK |
1866 | } |
1867 | out: | |
2122ff5e | 1868 | vcpu_put(vcpu); |
fa3795a7 DH |
1869 | kfree(fpu); |
1870 | kfree(kvm_sregs); | |
bccf2150 AK |
1871 | return r; |
1872 | } | |
1873 | ||
1874 | static long kvm_vm_ioctl(struct file *filp, | |
1875 | unsigned int ioctl, unsigned long arg) | |
1876 | { | |
1877 | struct kvm *kvm = filp->private_data; | |
1878 | void __user *argp = (void __user *)arg; | |
1fe779f8 | 1879 | int r; |
bccf2150 | 1880 | |
6d4e4c4f AK |
1881 | if (kvm->mm != current->mm) |
1882 | return -EIO; | |
bccf2150 AK |
1883 | switch (ioctl) { |
1884 | case KVM_CREATE_VCPU: | |
1885 | r = kvm_vm_ioctl_create_vcpu(kvm, arg); | |
1886 | if (r < 0) | |
1887 | goto out; | |
1888 | break; | |
6fc138d2 IE |
1889 | case KVM_SET_USER_MEMORY_REGION: { |
1890 | struct kvm_userspace_memory_region kvm_userspace_mem; | |
1891 | ||
1892 | r = -EFAULT; | |
1893 | if (copy_from_user(&kvm_userspace_mem, argp, | |
1894 | sizeof kvm_userspace_mem)) | |
1895 | goto out; | |
1896 | ||
1897 | r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_userspace_mem, 1); | |
6aa8b732 AK |
1898 | if (r) |
1899 | goto out; | |
1900 | break; | |
1901 | } | |
1902 | case KVM_GET_DIRTY_LOG: { | |
1903 | struct kvm_dirty_log log; | |
1904 | ||
1905 | r = -EFAULT; | |
2f366987 | 1906 | if (copy_from_user(&log, argp, sizeof log)) |
6aa8b732 | 1907 | goto out; |
2c6f5df9 | 1908 | r = kvm_vm_ioctl_get_dirty_log(kvm, &log); |
6aa8b732 AK |
1909 | if (r) |
1910 | goto out; | |
1911 | break; | |
1912 | } | |
5f94c174 LV |
1913 | #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET |
1914 | case KVM_REGISTER_COALESCED_MMIO: { | |
1915 | struct kvm_coalesced_mmio_zone zone; | |
1916 | r = -EFAULT; | |
1917 | if (copy_from_user(&zone, argp, sizeof zone)) | |
1918 | goto out; | |
5f94c174 LV |
1919 | r = kvm_vm_ioctl_register_coalesced_mmio(kvm, &zone); |
1920 | if (r) | |
1921 | goto out; | |
1922 | r = 0; | |
1923 | break; | |
1924 | } | |
1925 | case KVM_UNREGISTER_COALESCED_MMIO: { | |
1926 | struct kvm_coalesced_mmio_zone zone; | |
1927 | r = -EFAULT; | |
1928 | if (copy_from_user(&zone, argp, sizeof zone)) | |
1929 | goto out; | |
5f94c174 LV |
1930 | r = kvm_vm_ioctl_unregister_coalesced_mmio(kvm, &zone); |
1931 | if (r) | |
1932 | goto out; | |
1933 | r = 0; | |
1934 | break; | |
1935 | } | |
1936 | #endif | |
721eecbf GH |
1937 | case KVM_IRQFD: { |
1938 | struct kvm_irqfd data; | |
1939 | ||
1940 | r = -EFAULT; | |
1941 | if (copy_from_user(&data, argp, sizeof data)) | |
1942 | goto out; | |
1943 | r = kvm_irqfd(kvm, data.fd, data.gsi, data.flags); | |
1944 | break; | |
1945 | } | |
d34e6b17 GH |
1946 | case KVM_IOEVENTFD: { |
1947 | struct kvm_ioeventfd data; | |
1948 | ||
1949 | r = -EFAULT; | |
1950 | if (copy_from_user(&data, argp, sizeof data)) | |
1951 | goto out; | |
1952 | r = kvm_ioeventfd(kvm, &data); | |
1953 | break; | |
1954 | } | |
73880c80 GN |
1955 | #ifdef CONFIG_KVM_APIC_ARCHITECTURE |
1956 | case KVM_SET_BOOT_CPU_ID: | |
1957 | r = 0; | |
894a9c55 | 1958 | mutex_lock(&kvm->lock); |
73880c80 GN |
1959 | if (atomic_read(&kvm->online_vcpus) != 0) |
1960 | r = -EBUSY; | |
1961 | else | |
1962 | kvm->bsp_vcpu_id = arg; | |
894a9c55 | 1963 | mutex_unlock(&kvm->lock); |
73880c80 GN |
1964 | break; |
1965 | #endif | |
f17abe9a | 1966 | default: |
1fe779f8 | 1967 | r = kvm_arch_vm_ioctl(filp, ioctl, arg); |
bfd99ff5 AK |
1968 | if (r == -ENOTTY) |
1969 | r = kvm_vm_ioctl_assigned_device(kvm, ioctl, arg); | |
f17abe9a AK |
1970 | } |
1971 | out: | |
1972 | return r; | |
1973 | } | |
1974 | ||
6ff5894c AB |
1975 | #ifdef CONFIG_COMPAT |
1976 | struct compat_kvm_dirty_log { | |
1977 | __u32 slot; | |
1978 | __u32 padding1; | |
1979 | union { | |
1980 | compat_uptr_t dirty_bitmap; /* one bit per page */ | |
1981 | __u64 padding2; | |
1982 | }; | |
1983 | }; | |
1984 | ||
1985 | static long kvm_vm_compat_ioctl(struct file *filp, | |
1986 | unsigned int ioctl, unsigned long arg) | |
1987 | { | |
1988 | struct kvm *kvm = filp->private_data; | |
1989 | int r; | |
1990 | ||
1991 | if (kvm->mm != current->mm) | |
1992 | return -EIO; | |
1993 | switch (ioctl) { | |
1994 | case KVM_GET_DIRTY_LOG: { | |
1995 | struct compat_kvm_dirty_log compat_log; | |
1996 | struct kvm_dirty_log log; | |
1997 | ||
1998 | r = -EFAULT; | |
1999 | if (copy_from_user(&compat_log, (void __user *)arg, | |
2000 | sizeof(compat_log))) | |
2001 | goto out; | |
2002 | log.slot = compat_log.slot; | |
2003 | log.padding1 = compat_log.padding1; | |
2004 | log.padding2 = compat_log.padding2; | |
2005 | log.dirty_bitmap = compat_ptr(compat_log.dirty_bitmap); | |
2006 | ||
2007 | r = kvm_vm_ioctl_get_dirty_log(kvm, &log); | |
2008 | if (r) | |
2009 | goto out; | |
2010 | break; | |
2011 | } | |
2012 | default: | |
2013 | r = kvm_vm_ioctl(filp, ioctl, arg); | |
2014 | } | |
2015 | ||
2016 | out: | |
2017 | return r; | |
2018 | } | |
2019 | #endif | |
2020 | ||
e4a533a4 | 2021 | static int kvm_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf) |
f17abe9a | 2022 | { |
777b3f49 MT |
2023 | struct page *page[1]; |
2024 | unsigned long addr; | |
2025 | int npages; | |
2026 | gfn_t gfn = vmf->pgoff; | |
f17abe9a | 2027 | struct kvm *kvm = vma->vm_file->private_data; |
f17abe9a | 2028 | |
777b3f49 MT |
2029 | addr = gfn_to_hva(kvm, gfn); |
2030 | if (kvm_is_error_hva(addr)) | |
e4a533a4 | 2031 | return VM_FAULT_SIGBUS; |
777b3f49 MT |
2032 | |
2033 | npages = get_user_pages(current, current->mm, addr, 1, 1, 0, page, | |
2034 | NULL); | |
2035 | if (unlikely(npages != 1)) | |
e4a533a4 | 2036 | return VM_FAULT_SIGBUS; |
777b3f49 MT |
2037 | |
2038 | vmf->page = page[0]; | |
e4a533a4 | 2039 | return 0; |
f17abe9a AK |
2040 | } |
2041 | ||
f0f37e2f | 2042 | static const struct vm_operations_struct kvm_vm_vm_ops = { |
e4a533a4 | 2043 | .fault = kvm_vm_fault, |
f17abe9a AK |
2044 | }; |
2045 | ||
2046 | static int kvm_vm_mmap(struct file *file, struct vm_area_struct *vma) | |
2047 | { | |
2048 | vma->vm_ops = &kvm_vm_vm_ops; | |
2049 | return 0; | |
2050 | } | |
2051 | ||
3d3aab1b | 2052 | static struct file_operations kvm_vm_fops = { |
f17abe9a AK |
2053 | .release = kvm_vm_release, |
2054 | .unlocked_ioctl = kvm_vm_ioctl, | |
6ff5894c AB |
2055 | #ifdef CONFIG_COMPAT |
2056 | .compat_ioctl = kvm_vm_compat_ioctl, | |
2057 | #endif | |
f17abe9a | 2058 | .mmap = kvm_vm_mmap, |
6038f373 | 2059 | .llseek = noop_llseek, |
f17abe9a AK |
2060 | }; |
2061 | ||
2062 | static int kvm_dev_ioctl_create_vm(void) | |
2063 | { | |
aac87636 | 2064 | int r; |
f17abe9a AK |
2065 | struct kvm *kvm; |
2066 | ||
f17abe9a | 2067 | kvm = kvm_create_vm(); |
d6d28168 AK |
2068 | if (IS_ERR(kvm)) |
2069 | return PTR_ERR(kvm); | |
6ce5a090 TY |
2070 | #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET |
2071 | r = kvm_coalesced_mmio_init(kvm); | |
2072 | if (r < 0) { | |
2073 | kvm_put_kvm(kvm); | |
2074 | return r; | |
2075 | } | |
2076 | #endif | |
aac87636 HC |
2077 | r = anon_inode_getfd("kvm-vm", &kvm_vm_fops, kvm, O_RDWR); |
2078 | if (r < 0) | |
66c0b394 | 2079 | kvm_put_kvm(kvm); |
f17abe9a | 2080 | |
aac87636 | 2081 | return r; |
f17abe9a AK |
2082 | } |
2083 | ||
1a811b61 AK |
2084 | static long kvm_dev_ioctl_check_extension_generic(long arg) |
2085 | { | |
2086 | switch (arg) { | |
ca9edaee | 2087 | case KVM_CAP_USER_MEMORY: |
1a811b61 | 2088 | case KVM_CAP_DESTROY_MEMORY_REGION_WORKS: |
4cd481f6 | 2089 | case KVM_CAP_JOIN_MEMORY_REGIONS_WORKS: |
73880c80 GN |
2090 | #ifdef CONFIG_KVM_APIC_ARCHITECTURE |
2091 | case KVM_CAP_SET_BOOT_CPU_ID: | |
2092 | #endif | |
a9c7399d | 2093 | case KVM_CAP_INTERNAL_ERROR_DATA: |
1a811b61 | 2094 | return 1; |
399ec807 AK |
2095 | #ifdef CONFIG_HAVE_KVM_IRQCHIP |
2096 | case KVM_CAP_IRQ_ROUTING: | |
36463146 | 2097 | return KVM_MAX_IRQ_ROUTES; |
399ec807 | 2098 | #endif |
1a811b61 AK |
2099 | default: |
2100 | break; | |
2101 | } | |
2102 | return kvm_dev_ioctl_check_extension(arg); | |
2103 | } | |
2104 | ||
f17abe9a AK |
2105 | static long kvm_dev_ioctl(struct file *filp, |
2106 | unsigned int ioctl, unsigned long arg) | |
2107 | { | |
07c45a36 | 2108 | long r = -EINVAL; |
f17abe9a AK |
2109 | |
2110 | switch (ioctl) { | |
2111 | case KVM_GET_API_VERSION: | |
f0fe5108 AK |
2112 | r = -EINVAL; |
2113 | if (arg) | |
2114 | goto out; | |
f17abe9a AK |
2115 | r = KVM_API_VERSION; |
2116 | break; | |
2117 | case KVM_CREATE_VM: | |
f0fe5108 AK |
2118 | r = -EINVAL; |
2119 | if (arg) | |
2120 | goto out; | |
f17abe9a AK |
2121 | r = kvm_dev_ioctl_create_vm(); |
2122 | break; | |
018d00d2 | 2123 | case KVM_CHECK_EXTENSION: |
1a811b61 | 2124 | r = kvm_dev_ioctl_check_extension_generic(arg); |
5d308f45 | 2125 | break; |
07c45a36 AK |
2126 | case KVM_GET_VCPU_MMAP_SIZE: |
2127 | r = -EINVAL; | |
2128 | if (arg) | |
2129 | goto out; | |
adb1ff46 AK |
2130 | r = PAGE_SIZE; /* struct kvm_run */ |
2131 | #ifdef CONFIG_X86 | |
2132 | r += PAGE_SIZE; /* pio data page */ | |
5f94c174 LV |
2133 | #endif |
2134 | #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET | |
2135 | r += PAGE_SIZE; /* coalesced mmio ring page */ | |
adb1ff46 | 2136 | #endif |
07c45a36 | 2137 | break; |
d4c9ff2d FEL |
2138 | case KVM_TRACE_ENABLE: |
2139 | case KVM_TRACE_PAUSE: | |
2140 | case KVM_TRACE_DISABLE: | |
2023a29c | 2141 | r = -EOPNOTSUPP; |
d4c9ff2d | 2142 | break; |
6aa8b732 | 2143 | default: |
043405e1 | 2144 | return kvm_arch_dev_ioctl(filp, ioctl, arg); |
6aa8b732 AK |
2145 | } |
2146 | out: | |
2147 | return r; | |
2148 | } | |
2149 | ||
6aa8b732 | 2150 | static struct file_operations kvm_chardev_ops = { |
6aa8b732 AK |
2151 | .unlocked_ioctl = kvm_dev_ioctl, |
2152 | .compat_ioctl = kvm_dev_ioctl, | |
6038f373 | 2153 | .llseek = noop_llseek, |
6aa8b732 AK |
2154 | }; |
2155 | ||
2156 | static struct miscdevice kvm_dev = { | |
bbe4432e | 2157 | KVM_MINOR, |
6aa8b732 AK |
2158 | "kvm", |
2159 | &kvm_chardev_ops, | |
2160 | }; | |
2161 | ||
75b7127c | 2162 | static void hardware_enable_nolock(void *junk) |
1b6c0168 AK |
2163 | { |
2164 | int cpu = raw_smp_processor_id(); | |
10474ae8 | 2165 | int r; |
1b6c0168 | 2166 | |
7f59f492 | 2167 | if (cpumask_test_cpu(cpu, cpus_hardware_enabled)) |
1b6c0168 | 2168 | return; |
10474ae8 | 2169 | |
7f59f492 | 2170 | cpumask_set_cpu(cpu, cpus_hardware_enabled); |
10474ae8 AG |
2171 | |
2172 | r = kvm_arch_hardware_enable(NULL); | |
2173 | ||
2174 | if (r) { | |
2175 | cpumask_clear_cpu(cpu, cpus_hardware_enabled); | |
2176 | atomic_inc(&hardware_enable_failed); | |
2177 | printk(KERN_INFO "kvm: enabling virtualization on " | |
2178 | "CPU%d failed\n", cpu); | |
2179 | } | |
1b6c0168 AK |
2180 | } |
2181 | ||
75b7127c TY |
2182 | static void hardware_enable(void *junk) |
2183 | { | |
e935b837 | 2184 | raw_spin_lock(&kvm_lock); |
75b7127c | 2185 | hardware_enable_nolock(junk); |
e935b837 | 2186 | raw_spin_unlock(&kvm_lock); |
75b7127c TY |
2187 | } |
2188 | ||
2189 | static void hardware_disable_nolock(void *junk) | |
1b6c0168 AK |
2190 | { |
2191 | int cpu = raw_smp_processor_id(); | |
2192 | ||
7f59f492 | 2193 | if (!cpumask_test_cpu(cpu, cpus_hardware_enabled)) |
1b6c0168 | 2194 | return; |
7f59f492 | 2195 | cpumask_clear_cpu(cpu, cpus_hardware_enabled); |
e9b11c17 | 2196 | kvm_arch_hardware_disable(NULL); |
1b6c0168 AK |
2197 | } |
2198 | ||
75b7127c TY |
2199 | static void hardware_disable(void *junk) |
2200 | { | |
e935b837 | 2201 | raw_spin_lock(&kvm_lock); |
75b7127c | 2202 | hardware_disable_nolock(junk); |
e935b837 | 2203 | raw_spin_unlock(&kvm_lock); |
75b7127c TY |
2204 | } |
2205 | ||
10474ae8 AG |
2206 | static void hardware_disable_all_nolock(void) |
2207 | { | |
2208 | BUG_ON(!kvm_usage_count); | |
2209 | ||
2210 | kvm_usage_count--; | |
2211 | if (!kvm_usage_count) | |
75b7127c | 2212 | on_each_cpu(hardware_disable_nolock, NULL, 1); |
10474ae8 AG |
2213 | } |
2214 | ||
2215 | static void hardware_disable_all(void) | |
2216 | { | |
e935b837 | 2217 | raw_spin_lock(&kvm_lock); |
10474ae8 | 2218 | hardware_disable_all_nolock(); |
e935b837 | 2219 | raw_spin_unlock(&kvm_lock); |
10474ae8 AG |
2220 | } |
2221 | ||
2222 | static int hardware_enable_all(void) | |
2223 | { | |
2224 | int r = 0; | |
2225 | ||
e935b837 | 2226 | raw_spin_lock(&kvm_lock); |
10474ae8 AG |
2227 | |
2228 | kvm_usage_count++; | |
2229 | if (kvm_usage_count == 1) { | |
2230 | atomic_set(&hardware_enable_failed, 0); | |
75b7127c | 2231 | on_each_cpu(hardware_enable_nolock, NULL, 1); |
10474ae8 AG |
2232 | |
2233 | if (atomic_read(&hardware_enable_failed)) { | |
2234 | hardware_disable_all_nolock(); | |
2235 | r = -EBUSY; | |
2236 | } | |
2237 | } | |
2238 | ||
e935b837 | 2239 | raw_spin_unlock(&kvm_lock); |
10474ae8 AG |
2240 | |
2241 | return r; | |
2242 | } | |
2243 | ||
774c47f1 AK |
2244 | static int kvm_cpu_hotplug(struct notifier_block *notifier, unsigned long val, |
2245 | void *v) | |
2246 | { | |
2247 | int cpu = (long)v; | |
2248 | ||
10474ae8 AG |
2249 | if (!kvm_usage_count) |
2250 | return NOTIFY_OK; | |
2251 | ||
1a6f4d7f | 2252 | val &= ~CPU_TASKS_FROZEN; |
774c47f1 | 2253 | switch (val) { |
cec9ad27 | 2254 | case CPU_DYING: |
6ec8a856 AK |
2255 | printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n", |
2256 | cpu); | |
2257 | hardware_disable(NULL); | |
2258 | break; | |
da908f2f | 2259 | case CPU_STARTING: |
43934a38 JK |
2260 | printk(KERN_INFO "kvm: enabling virtualization on CPU%d\n", |
2261 | cpu); | |
da908f2f | 2262 | hardware_enable(NULL); |
774c47f1 AK |
2263 | break; |
2264 | } | |
2265 | return NOTIFY_OK; | |
2266 | } | |
2267 | ||
4ecac3fd | 2268 | |
b7c4145b | 2269 | asmlinkage void kvm_spurious_fault(void) |
4ecac3fd | 2270 | { |
4ecac3fd AK |
2271 | /* Fault while not rebooting. We want the trace. */ |
2272 | BUG(); | |
2273 | } | |
b7c4145b | 2274 | EXPORT_SYMBOL_GPL(kvm_spurious_fault); |
4ecac3fd | 2275 | |
9a2b85c6 | 2276 | static int kvm_reboot(struct notifier_block *notifier, unsigned long val, |
d77c26fc | 2277 | void *v) |
9a2b85c6 | 2278 | { |
8e1c1815 SY |
2279 | /* |
2280 | * Some (well, at least mine) BIOSes hang on reboot if | |
2281 | * in vmx root mode. | |
2282 | * | |
2283 | * And Intel TXT required VMX off for all cpu when system shutdown. | |
2284 | */ | |
2285 | printk(KERN_INFO "kvm: exiting hardware virtualization\n"); | |
2286 | kvm_rebooting = true; | |
75b7127c | 2287 | on_each_cpu(hardware_disable_nolock, NULL, 1); |
9a2b85c6 RR |
2288 | return NOTIFY_OK; |
2289 | } | |
2290 | ||
2291 | static struct notifier_block kvm_reboot_notifier = { | |
2292 | .notifier_call = kvm_reboot, | |
2293 | .priority = 0, | |
2294 | }; | |
2295 | ||
e93f8a0f | 2296 | static void kvm_io_bus_destroy(struct kvm_io_bus *bus) |
2eeb2e94 GH |
2297 | { |
2298 | int i; | |
2299 | ||
2300 | for (i = 0; i < bus->dev_count; i++) { | |
2301 | struct kvm_io_device *pos = bus->devs[i]; | |
2302 | ||
2303 | kvm_iodevice_destructor(pos); | |
2304 | } | |
e93f8a0f | 2305 | kfree(bus); |
2eeb2e94 GH |
2306 | } |
2307 | ||
bda9020e | 2308 | /* kvm_io_bus_write - called under kvm->slots_lock */ |
e93f8a0f | 2309 | int kvm_io_bus_write(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr, |
bda9020e | 2310 | int len, const void *val) |
2eeb2e94 GH |
2311 | { |
2312 | int i; | |
90d83dc3 LJ |
2313 | struct kvm_io_bus *bus; |
2314 | ||
2315 | bus = srcu_dereference(kvm->buses[bus_idx], &kvm->srcu); | |
bda9020e MT |
2316 | for (i = 0; i < bus->dev_count; i++) |
2317 | if (!kvm_iodevice_write(bus->devs[i], addr, len, val)) | |
2318 | return 0; | |
2319 | return -EOPNOTSUPP; | |
2320 | } | |
2eeb2e94 | 2321 | |
bda9020e | 2322 | /* kvm_io_bus_read - called under kvm->slots_lock */ |
e93f8a0f MT |
2323 | int kvm_io_bus_read(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr, |
2324 | int len, void *val) | |
bda9020e MT |
2325 | { |
2326 | int i; | |
90d83dc3 | 2327 | struct kvm_io_bus *bus; |
e93f8a0f | 2328 | |
90d83dc3 | 2329 | bus = srcu_dereference(kvm->buses[bus_idx], &kvm->srcu); |
bda9020e MT |
2330 | for (i = 0; i < bus->dev_count; i++) |
2331 | if (!kvm_iodevice_read(bus->devs[i], addr, len, val)) | |
2332 | return 0; | |
2333 | return -EOPNOTSUPP; | |
2eeb2e94 GH |
2334 | } |
2335 | ||
79fac95e | 2336 | /* Caller must hold slots_lock. */ |
e93f8a0f MT |
2337 | int kvm_io_bus_register_dev(struct kvm *kvm, enum kvm_bus bus_idx, |
2338 | struct kvm_io_device *dev) | |
6c474694 | 2339 | { |
e93f8a0f | 2340 | struct kvm_io_bus *new_bus, *bus; |
090b7aff | 2341 | |
e93f8a0f | 2342 | bus = kvm->buses[bus_idx]; |
090b7aff GH |
2343 | if (bus->dev_count > NR_IOBUS_DEVS-1) |
2344 | return -ENOSPC; | |
2eeb2e94 | 2345 | |
e93f8a0f MT |
2346 | new_bus = kzalloc(sizeof(struct kvm_io_bus), GFP_KERNEL); |
2347 | if (!new_bus) | |
2348 | return -ENOMEM; | |
2349 | memcpy(new_bus, bus, sizeof(struct kvm_io_bus)); | |
2350 | new_bus->devs[new_bus->dev_count++] = dev; | |
2351 | rcu_assign_pointer(kvm->buses[bus_idx], new_bus); | |
2352 | synchronize_srcu_expedited(&kvm->srcu); | |
2353 | kfree(bus); | |
090b7aff GH |
2354 | |
2355 | return 0; | |
2356 | } | |
2357 | ||
79fac95e | 2358 | /* Caller must hold slots_lock. */ |
e93f8a0f MT |
2359 | int kvm_io_bus_unregister_dev(struct kvm *kvm, enum kvm_bus bus_idx, |
2360 | struct kvm_io_device *dev) | |
090b7aff | 2361 | { |
e93f8a0f MT |
2362 | int i, r; |
2363 | struct kvm_io_bus *new_bus, *bus; | |
090b7aff | 2364 | |
e93f8a0f MT |
2365 | new_bus = kzalloc(sizeof(struct kvm_io_bus), GFP_KERNEL); |
2366 | if (!new_bus) | |
2367 | return -ENOMEM; | |
090b7aff | 2368 | |
e93f8a0f MT |
2369 | bus = kvm->buses[bus_idx]; |
2370 | memcpy(new_bus, bus, sizeof(struct kvm_io_bus)); | |
2371 | ||
2372 | r = -ENOENT; | |
2373 | for (i = 0; i < new_bus->dev_count; i++) | |
2374 | if (new_bus->devs[i] == dev) { | |
2375 | r = 0; | |
2376 | new_bus->devs[i] = new_bus->devs[--new_bus->dev_count]; | |
090b7aff GH |
2377 | break; |
2378 | } | |
e93f8a0f MT |
2379 | |
2380 | if (r) { | |
2381 | kfree(new_bus); | |
2382 | return r; | |
2383 | } | |
2384 | ||
2385 | rcu_assign_pointer(kvm->buses[bus_idx], new_bus); | |
2386 | synchronize_srcu_expedited(&kvm->srcu); | |
2387 | kfree(bus); | |
2388 | return r; | |
2eeb2e94 GH |
2389 | } |
2390 | ||
774c47f1 AK |
2391 | static struct notifier_block kvm_cpu_notifier = { |
2392 | .notifier_call = kvm_cpu_hotplug, | |
774c47f1 AK |
2393 | }; |
2394 | ||
8b88b099 | 2395 | static int vm_stat_get(void *_offset, u64 *val) |
ba1389b7 AK |
2396 | { |
2397 | unsigned offset = (long)_offset; | |
ba1389b7 AK |
2398 | struct kvm *kvm; |
2399 | ||
8b88b099 | 2400 | *val = 0; |
e935b837 | 2401 | raw_spin_lock(&kvm_lock); |
ba1389b7 | 2402 | list_for_each_entry(kvm, &vm_list, vm_list) |
8b88b099 | 2403 | *val += *(u32 *)((void *)kvm + offset); |
e935b837 | 2404 | raw_spin_unlock(&kvm_lock); |
8b88b099 | 2405 | return 0; |
ba1389b7 AK |
2406 | } |
2407 | ||
2408 | DEFINE_SIMPLE_ATTRIBUTE(vm_stat_fops, vm_stat_get, NULL, "%llu\n"); | |
2409 | ||
8b88b099 | 2410 | static int vcpu_stat_get(void *_offset, u64 *val) |
1165f5fe AK |
2411 | { |
2412 | unsigned offset = (long)_offset; | |
1165f5fe AK |
2413 | struct kvm *kvm; |
2414 | struct kvm_vcpu *vcpu; | |
2415 | int i; | |
2416 | ||
8b88b099 | 2417 | *val = 0; |
e935b837 | 2418 | raw_spin_lock(&kvm_lock); |
1165f5fe | 2419 | list_for_each_entry(kvm, &vm_list, vm_list) |
988a2cae GN |
2420 | kvm_for_each_vcpu(i, vcpu, kvm) |
2421 | *val += *(u32 *)((void *)vcpu + offset); | |
2422 | ||
e935b837 | 2423 | raw_spin_unlock(&kvm_lock); |
8b88b099 | 2424 | return 0; |
1165f5fe AK |
2425 | } |
2426 | ||
ba1389b7 AK |
2427 | DEFINE_SIMPLE_ATTRIBUTE(vcpu_stat_fops, vcpu_stat_get, NULL, "%llu\n"); |
2428 | ||
828c0950 | 2429 | static const struct file_operations *stat_fops[] = { |
ba1389b7 AK |
2430 | [KVM_STAT_VCPU] = &vcpu_stat_fops, |
2431 | [KVM_STAT_VM] = &vm_stat_fops, | |
2432 | }; | |
1165f5fe | 2433 | |
a16b043c | 2434 | static void kvm_init_debug(void) |
6aa8b732 AK |
2435 | { |
2436 | struct kvm_stats_debugfs_item *p; | |
2437 | ||
76f7c879 | 2438 | kvm_debugfs_dir = debugfs_create_dir("kvm", NULL); |
6aa8b732 | 2439 | for (p = debugfs_entries; p->name; ++p) |
76f7c879 | 2440 | p->dentry = debugfs_create_file(p->name, 0444, kvm_debugfs_dir, |
1165f5fe | 2441 | (void *)(long)p->offset, |
ba1389b7 | 2442 | stat_fops[p->kind]); |
6aa8b732 AK |
2443 | } |
2444 | ||
2445 | static void kvm_exit_debug(void) | |
2446 | { | |
2447 | struct kvm_stats_debugfs_item *p; | |
2448 | ||
2449 | for (p = debugfs_entries; p->name; ++p) | |
2450 | debugfs_remove(p->dentry); | |
76f7c879 | 2451 | debugfs_remove(kvm_debugfs_dir); |
6aa8b732 AK |
2452 | } |
2453 | ||
fb3600cc | 2454 | static int kvm_suspend(void) |
59ae6c6b | 2455 | { |
10474ae8 | 2456 | if (kvm_usage_count) |
75b7127c | 2457 | hardware_disable_nolock(NULL); |
59ae6c6b AK |
2458 | return 0; |
2459 | } | |
2460 | ||
fb3600cc | 2461 | static void kvm_resume(void) |
59ae6c6b | 2462 | { |
ca84d1a2 | 2463 | if (kvm_usage_count) { |
e935b837 | 2464 | WARN_ON(raw_spin_is_locked(&kvm_lock)); |
75b7127c | 2465 | hardware_enable_nolock(NULL); |
ca84d1a2 | 2466 | } |
59ae6c6b AK |
2467 | } |
2468 | ||
fb3600cc | 2469 | static struct syscore_ops kvm_syscore_ops = { |
59ae6c6b AK |
2470 | .suspend = kvm_suspend, |
2471 | .resume = kvm_resume, | |
2472 | }; | |
2473 | ||
cea7bb21 | 2474 | struct page *bad_page; |
35149e21 | 2475 | pfn_t bad_pfn; |
6aa8b732 | 2476 | |
15ad7146 AK |
2477 | static inline |
2478 | struct kvm_vcpu *preempt_notifier_to_vcpu(struct preempt_notifier *pn) | |
2479 | { | |
2480 | return container_of(pn, struct kvm_vcpu, preempt_notifier); | |
2481 | } | |
2482 | ||
2483 | static void kvm_sched_in(struct preempt_notifier *pn, int cpu) | |
2484 | { | |
2485 | struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn); | |
2486 | ||
e9b11c17 | 2487 | kvm_arch_vcpu_load(vcpu, cpu); |
15ad7146 AK |
2488 | } |
2489 | ||
2490 | static void kvm_sched_out(struct preempt_notifier *pn, | |
2491 | struct task_struct *next) | |
2492 | { | |
2493 | struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn); | |
2494 | ||
e9b11c17 | 2495 | kvm_arch_vcpu_put(vcpu); |
15ad7146 AK |
2496 | } |
2497 | ||
0ee75bea | 2498 | int kvm_init(void *opaque, unsigned vcpu_size, unsigned vcpu_align, |
c16f862d | 2499 | struct module *module) |
6aa8b732 AK |
2500 | { |
2501 | int r; | |
002c7f7c | 2502 | int cpu; |
6aa8b732 | 2503 | |
f8c16bba ZX |
2504 | r = kvm_arch_init(opaque); |
2505 | if (r) | |
d2308784 | 2506 | goto out_fail; |
cb498ea2 ZX |
2507 | |
2508 | bad_page = alloc_page(GFP_KERNEL | __GFP_ZERO); | |
2509 | ||
2510 | if (bad_page == NULL) { | |
2511 | r = -ENOMEM; | |
2512 | goto out; | |
2513 | } | |
2514 | ||
35149e21 AL |
2515 | bad_pfn = page_to_pfn(bad_page); |
2516 | ||
bf998156 HY |
2517 | hwpoison_page = alloc_page(GFP_KERNEL | __GFP_ZERO); |
2518 | ||
2519 | if (hwpoison_page == NULL) { | |
2520 | r = -ENOMEM; | |
2521 | goto out_free_0; | |
2522 | } | |
2523 | ||
2524 | hwpoison_pfn = page_to_pfn(hwpoison_page); | |
2525 | ||
edba23e5 GN |
2526 | fault_page = alloc_page(GFP_KERNEL | __GFP_ZERO); |
2527 | ||
2528 | if (fault_page == NULL) { | |
2529 | r = -ENOMEM; | |
2530 | goto out_free_0; | |
2531 | } | |
2532 | ||
2533 | fault_pfn = page_to_pfn(fault_page); | |
2534 | ||
8437a617 | 2535 | if (!zalloc_cpumask_var(&cpus_hardware_enabled, GFP_KERNEL)) { |
7f59f492 RR |
2536 | r = -ENOMEM; |
2537 | goto out_free_0; | |
2538 | } | |
2539 | ||
e9b11c17 | 2540 | r = kvm_arch_hardware_setup(); |
6aa8b732 | 2541 | if (r < 0) |
7f59f492 | 2542 | goto out_free_0a; |
6aa8b732 | 2543 | |
002c7f7c YS |
2544 | for_each_online_cpu(cpu) { |
2545 | smp_call_function_single(cpu, | |
e9b11c17 | 2546 | kvm_arch_check_processor_compat, |
8691e5a8 | 2547 | &r, 1); |
002c7f7c | 2548 | if (r < 0) |
d2308784 | 2549 | goto out_free_1; |
002c7f7c YS |
2550 | } |
2551 | ||
774c47f1 AK |
2552 | r = register_cpu_notifier(&kvm_cpu_notifier); |
2553 | if (r) | |
d2308784 | 2554 | goto out_free_2; |
6aa8b732 AK |
2555 | register_reboot_notifier(&kvm_reboot_notifier); |
2556 | ||
c16f862d | 2557 | /* A kmem cache lets us meet the alignment requirements of fx_save. */ |
0ee75bea AK |
2558 | if (!vcpu_align) |
2559 | vcpu_align = __alignof__(struct kvm_vcpu); | |
2560 | kvm_vcpu_cache = kmem_cache_create("kvm_vcpu", vcpu_size, vcpu_align, | |
56919c5c | 2561 | 0, NULL); |
c16f862d RR |
2562 | if (!kvm_vcpu_cache) { |
2563 | r = -ENOMEM; | |
fb3600cc | 2564 | goto out_free_3; |
c16f862d RR |
2565 | } |
2566 | ||
af585b92 GN |
2567 | r = kvm_async_pf_init(); |
2568 | if (r) | |
2569 | goto out_free; | |
2570 | ||
6aa8b732 | 2571 | kvm_chardev_ops.owner = module; |
3d3aab1b CB |
2572 | kvm_vm_fops.owner = module; |
2573 | kvm_vcpu_fops.owner = module; | |
6aa8b732 AK |
2574 | |
2575 | r = misc_register(&kvm_dev); | |
2576 | if (r) { | |
d77c26fc | 2577 | printk(KERN_ERR "kvm: misc device register failed\n"); |
af585b92 | 2578 | goto out_unreg; |
6aa8b732 AK |
2579 | } |
2580 | ||
fb3600cc RW |
2581 | register_syscore_ops(&kvm_syscore_ops); |
2582 | ||
15ad7146 AK |
2583 | kvm_preempt_ops.sched_in = kvm_sched_in; |
2584 | kvm_preempt_ops.sched_out = kvm_sched_out; | |
2585 | ||
0ea4ed8e DW |
2586 | kvm_init_debug(); |
2587 | ||
c7addb90 | 2588 | return 0; |
6aa8b732 | 2589 | |
af585b92 GN |
2590 | out_unreg: |
2591 | kvm_async_pf_deinit(); | |
6aa8b732 | 2592 | out_free: |
c16f862d | 2593 | kmem_cache_destroy(kvm_vcpu_cache); |
d2308784 | 2594 | out_free_3: |
6aa8b732 | 2595 | unregister_reboot_notifier(&kvm_reboot_notifier); |
774c47f1 | 2596 | unregister_cpu_notifier(&kvm_cpu_notifier); |
d2308784 | 2597 | out_free_2: |
d2308784 | 2598 | out_free_1: |
e9b11c17 | 2599 | kvm_arch_hardware_unsetup(); |
7f59f492 RR |
2600 | out_free_0a: |
2601 | free_cpumask_var(cpus_hardware_enabled); | |
d2308784 | 2602 | out_free_0: |
edba23e5 GN |
2603 | if (fault_page) |
2604 | __free_page(fault_page); | |
bf998156 HY |
2605 | if (hwpoison_page) |
2606 | __free_page(hwpoison_page); | |
d2308784 | 2607 | __free_page(bad_page); |
ca45aaae | 2608 | out: |
f8c16bba | 2609 | kvm_arch_exit(); |
d2308784 | 2610 | out_fail: |
6aa8b732 AK |
2611 | return r; |
2612 | } | |
cb498ea2 | 2613 | EXPORT_SYMBOL_GPL(kvm_init); |
6aa8b732 | 2614 | |
cb498ea2 | 2615 | void kvm_exit(void) |
6aa8b732 | 2616 | { |
0ea4ed8e | 2617 | kvm_exit_debug(); |
6aa8b732 | 2618 | misc_deregister(&kvm_dev); |
c16f862d | 2619 | kmem_cache_destroy(kvm_vcpu_cache); |
af585b92 | 2620 | kvm_async_pf_deinit(); |
fb3600cc | 2621 | unregister_syscore_ops(&kvm_syscore_ops); |
6aa8b732 | 2622 | unregister_reboot_notifier(&kvm_reboot_notifier); |
59ae6c6b | 2623 | unregister_cpu_notifier(&kvm_cpu_notifier); |
75b7127c | 2624 | on_each_cpu(hardware_disable_nolock, NULL, 1); |
e9b11c17 | 2625 | kvm_arch_hardware_unsetup(); |
f8c16bba | 2626 | kvm_arch_exit(); |
7f59f492 | 2627 | free_cpumask_var(cpus_hardware_enabled); |
bf998156 | 2628 | __free_page(hwpoison_page); |
cea7bb21 | 2629 | __free_page(bad_page); |
6aa8b732 | 2630 | } |
cb498ea2 | 2631 | EXPORT_SYMBOL_GPL(kvm_exit); |