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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 | } |
46a26bf5 | 470 | |
4c07b0a4 | 471 | r = kvm_init_mmu_notifier(kvm); |
57e7fbee | 472 | if (r) |
283d0c65 | 473 | goto out_err; |
e930bffe | 474 | |
6d4e4c4f AK |
475 | kvm->mm = current->mm; |
476 | atomic_inc(&kvm->mm->mm_count); | |
aaee2c94 | 477 | spin_lock_init(&kvm->mmu_lock); |
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; | |
e7cacd40 | 651 | if (user_alloc && (mem->userspace_addr & (PAGE_SIZE - 1))) |
78749809 | 652 | goto out; |
e0d62c7f | 653 | if (mem->slot >= KVM_MEMORY_SLOTS + KVM_PRIVATE_MEM_SLOTS) |
6aa8b732 AK |
654 | goto out; |
655 | if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr) | |
656 | goto out; | |
657 | ||
46a26bf5 | 658 | memslot = &kvm->memslots->memslots[mem->slot]; |
6aa8b732 AK |
659 | base_gfn = mem->guest_phys_addr >> PAGE_SHIFT; |
660 | npages = mem->memory_size >> PAGE_SHIFT; | |
661 | ||
660c22c4 TY |
662 | r = -EINVAL; |
663 | if (npages > KVM_MEM_MAX_NR_PAGES) | |
664 | goto out; | |
665 | ||
6aa8b732 AK |
666 | if (!npages) |
667 | mem->flags &= ~KVM_MEM_LOG_DIRTY_PAGES; | |
668 | ||
6aa8b732 AK |
669 | new = old = *memslot; |
670 | ||
e36d96f7 | 671 | new.id = mem->slot; |
6aa8b732 AK |
672 | new.base_gfn = base_gfn; |
673 | new.npages = npages; | |
674 | new.flags = mem->flags; | |
675 | ||
676 | /* Disallow changing a memory slot's size. */ | |
677 | r = -EINVAL; | |
678 | if (npages && old.npages && npages != old.npages) | |
f78e0e2e | 679 | goto out_free; |
6aa8b732 AK |
680 | |
681 | /* Check for overlaps */ | |
682 | r = -EEXIST; | |
683 | for (i = 0; i < KVM_MEMORY_SLOTS; ++i) { | |
46a26bf5 | 684 | struct kvm_memory_slot *s = &kvm->memslots->memslots[i]; |
6aa8b732 | 685 | |
4cd481f6 | 686 | if (s == memslot || !s->npages) |
6aa8b732 AK |
687 | continue; |
688 | if (!((base_gfn + npages <= s->base_gfn) || | |
689 | (base_gfn >= s->base_gfn + s->npages))) | |
f78e0e2e | 690 | goto out_free; |
6aa8b732 | 691 | } |
6aa8b732 | 692 | |
6aa8b732 AK |
693 | /* Free page dirty bitmap if unneeded */ |
694 | if (!(new.flags & KVM_MEM_LOG_DIRTY_PAGES)) | |
8b6d44c7 | 695 | new.dirty_bitmap = NULL; |
6aa8b732 AK |
696 | |
697 | r = -ENOMEM; | |
698 | ||
699 | /* Allocate if a slot is being created */ | |
eff0114a | 700 | #ifndef CONFIG_S390 |
8d4e1288 | 701 | if (npages && !new.rmap) { |
26535037 | 702 | new.rmap = vzalloc(npages * sizeof(*new.rmap)); |
290fc38d IE |
703 | |
704 | if (!new.rmap) | |
f78e0e2e | 705 | goto out_free; |
290fc38d | 706 | |
80b14b5b | 707 | new.user_alloc = user_alloc; |
bc6678a3 | 708 | new.userspace_addr = mem->userspace_addr; |
6aa8b732 | 709 | } |
ec04b260 JR |
710 | if (!npages) |
711 | goto skip_lpage; | |
05da4558 | 712 | |
ec04b260 | 713 | for (i = 0; i < KVM_NR_PAGE_SIZES - 1; ++i) { |
28bcb112 HC |
714 | unsigned long ugfn; |
715 | unsigned long j; | |
716 | int lpages; | |
ec04b260 | 717 | int level = i + 2; |
05da4558 | 718 | |
ec04b260 JR |
719 | /* Avoid unused variable warning if no large pages */ |
720 | (void)level; | |
721 | ||
722 | if (new.lpage_info[i]) | |
723 | continue; | |
724 | ||
82855413 JR |
725 | lpages = 1 + ((base_gfn + npages - 1) |
726 | >> KVM_HPAGE_GFN_SHIFT(level)); | |
727 | lpages -= base_gfn >> KVM_HPAGE_GFN_SHIFT(level); | |
ec04b260 | 728 | |
26535037 | 729 | new.lpage_info[i] = vzalloc(lpages * sizeof(*new.lpage_info[i])); |
ec04b260 JR |
730 | |
731 | if (!new.lpage_info[i]) | |
05da4558 MT |
732 | goto out_free; |
733 | ||
82855413 | 734 | if (base_gfn & (KVM_PAGES_PER_HPAGE(level) - 1)) |
ec04b260 | 735 | new.lpage_info[i][0].write_count = 1; |
82855413 | 736 | if ((base_gfn+npages) & (KVM_PAGES_PER_HPAGE(level) - 1)) |
ec04b260 | 737 | new.lpage_info[i][lpages - 1].write_count = 1; |
ac04527f AK |
738 | ugfn = new.userspace_addr >> PAGE_SHIFT; |
739 | /* | |
740 | * If the gfn and userspace address are not aligned wrt each | |
54dee993 MT |
741 | * other, or if explicitly asked to, disable large page |
742 | * support for this slot | |
ac04527f | 743 | */ |
ec04b260 | 744 | if ((base_gfn ^ ugfn) & (KVM_PAGES_PER_HPAGE(level) - 1) || |
54dee993 | 745 | !largepages_enabled) |
ec04b260 JR |
746 | for (j = 0; j < lpages; ++j) |
747 | new.lpage_info[i][j].write_count = 1; | |
05da4558 | 748 | } |
6aa8b732 | 749 | |
ec04b260 JR |
750 | skip_lpage: |
751 | ||
6aa8b732 AK |
752 | /* Allocate page dirty bitmap if needed */ |
753 | if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) { | |
a36a57b1 | 754 | if (kvm_create_dirty_bitmap(&new) < 0) |
f78e0e2e | 755 | goto out_free; |
bc6678a3 | 756 | /* destroy any largepage mappings for dirty tracking */ |
6aa8b732 | 757 | } |
3eea8437 CB |
758 | #else /* not defined CONFIG_S390 */ |
759 | new.user_alloc = user_alloc; | |
760 | if (user_alloc) | |
761 | new.userspace_addr = mem->userspace_addr; | |
eff0114a | 762 | #endif /* not defined CONFIG_S390 */ |
6aa8b732 | 763 | |
bc6678a3 MT |
764 | if (!npages) { |
765 | r = -ENOMEM; | |
766 | slots = kzalloc(sizeof(struct kvm_memslots), GFP_KERNEL); | |
767 | if (!slots) | |
768 | goto out_free; | |
769 | memcpy(slots, kvm->memslots, sizeof(struct kvm_memslots)); | |
770 | if (mem->slot >= slots->nmemslots) | |
771 | slots->nmemslots = mem->slot + 1; | |
49c7754c | 772 | slots->generation++; |
bc6678a3 MT |
773 | slots->memslots[mem->slot].flags |= KVM_MEMSLOT_INVALID; |
774 | ||
775 | old_memslots = kvm->memslots; | |
776 | rcu_assign_pointer(kvm->memslots, slots); | |
777 | synchronize_srcu_expedited(&kvm->srcu); | |
778 | /* From this point no new shadow pages pointing to a deleted | |
779 | * memslot will be created. | |
780 | * | |
781 | * validation of sp->gfn happens in: | |
782 | * - gfn_to_hva (kvm_read_guest, gfn_to_pfn) | |
783 | * - kvm_is_visible_gfn (mmu_check_roots) | |
784 | */ | |
34d4cb8f | 785 | kvm_arch_flush_shadow(kvm); |
bc6678a3 MT |
786 | kfree(old_memslots); |
787 | } | |
34d4cb8f | 788 | |
f7784b8e MT |
789 | r = kvm_arch_prepare_memory_region(kvm, &new, old, mem, user_alloc); |
790 | if (r) | |
791 | goto out_free; | |
792 | ||
bc6678a3 MT |
793 | /* map the pages in iommu page table */ |
794 | if (npages) { | |
795 | r = kvm_iommu_map_pages(kvm, &new); | |
796 | if (r) | |
797 | goto out_free; | |
798 | } | |
604b38ac | 799 | |
bc6678a3 MT |
800 | r = -ENOMEM; |
801 | slots = kzalloc(sizeof(struct kvm_memslots), GFP_KERNEL); | |
802 | if (!slots) | |
803 | goto out_free; | |
804 | memcpy(slots, kvm->memslots, sizeof(struct kvm_memslots)); | |
805 | if (mem->slot >= slots->nmemslots) | |
806 | slots->nmemslots = mem->slot + 1; | |
49c7754c | 807 | slots->generation++; |
bc6678a3 MT |
808 | |
809 | /* actual memory is freed via old in kvm_free_physmem_slot below */ | |
810 | if (!npages) { | |
811 | new.rmap = NULL; | |
812 | new.dirty_bitmap = NULL; | |
813 | for (i = 0; i < KVM_NR_PAGE_SIZES - 1; ++i) | |
814 | new.lpage_info[i] = NULL; | |
815 | } | |
816 | ||
817 | slots->memslots[mem->slot] = new; | |
818 | old_memslots = kvm->memslots; | |
819 | rcu_assign_pointer(kvm->memslots, slots); | |
820 | synchronize_srcu_expedited(&kvm->srcu); | |
3ad82a7e | 821 | |
f7784b8e | 822 | kvm_arch_commit_memory_region(kvm, mem, old, user_alloc); |
82ce2c96 | 823 | |
bc6678a3 MT |
824 | kvm_free_physmem_slot(&old, &new); |
825 | kfree(old_memslots); | |
826 | ||
6aa8b732 AK |
827 | return 0; |
828 | ||
f78e0e2e | 829 | out_free: |
6aa8b732 AK |
830 | kvm_free_physmem_slot(&new, &old); |
831 | out: | |
832 | return r; | |
210c7c4d IE |
833 | |
834 | } | |
f78e0e2e SY |
835 | EXPORT_SYMBOL_GPL(__kvm_set_memory_region); |
836 | ||
837 | int kvm_set_memory_region(struct kvm *kvm, | |
838 | struct kvm_userspace_memory_region *mem, | |
839 | int user_alloc) | |
840 | { | |
841 | int r; | |
842 | ||
79fac95e | 843 | mutex_lock(&kvm->slots_lock); |
f78e0e2e | 844 | r = __kvm_set_memory_region(kvm, mem, user_alloc); |
79fac95e | 845 | mutex_unlock(&kvm->slots_lock); |
f78e0e2e SY |
846 | return r; |
847 | } | |
210c7c4d IE |
848 | EXPORT_SYMBOL_GPL(kvm_set_memory_region); |
849 | ||
1fe779f8 CO |
850 | int kvm_vm_ioctl_set_memory_region(struct kvm *kvm, |
851 | struct | |
852 | kvm_userspace_memory_region *mem, | |
853 | int user_alloc) | |
210c7c4d | 854 | { |
e0d62c7f IE |
855 | if (mem->slot >= KVM_MEMORY_SLOTS) |
856 | return -EINVAL; | |
210c7c4d | 857 | return kvm_set_memory_region(kvm, mem, user_alloc); |
6aa8b732 AK |
858 | } |
859 | ||
5bb064dc ZX |
860 | int kvm_get_dirty_log(struct kvm *kvm, |
861 | struct kvm_dirty_log *log, int *is_dirty) | |
6aa8b732 AK |
862 | { |
863 | struct kvm_memory_slot *memslot; | |
864 | int r, i; | |
87bf6e7d | 865 | unsigned long n; |
6aa8b732 AK |
866 | unsigned long any = 0; |
867 | ||
6aa8b732 AK |
868 | r = -EINVAL; |
869 | if (log->slot >= KVM_MEMORY_SLOTS) | |
870 | goto out; | |
871 | ||
46a26bf5 | 872 | memslot = &kvm->memslots->memslots[log->slot]; |
6aa8b732 AK |
873 | r = -ENOENT; |
874 | if (!memslot->dirty_bitmap) | |
875 | goto out; | |
876 | ||
87bf6e7d | 877 | n = kvm_dirty_bitmap_bytes(memslot); |
6aa8b732 | 878 | |
cd1a4a98 | 879 | for (i = 0; !any && i < n/sizeof(long); ++i) |
6aa8b732 AK |
880 | any = memslot->dirty_bitmap[i]; |
881 | ||
882 | r = -EFAULT; | |
883 | if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n)) | |
884 | goto out; | |
885 | ||
5bb064dc ZX |
886 | if (any) |
887 | *is_dirty = 1; | |
6aa8b732 AK |
888 | |
889 | r = 0; | |
6aa8b732 | 890 | out: |
6aa8b732 AK |
891 | return r; |
892 | } | |
893 | ||
54dee993 MT |
894 | void kvm_disable_largepages(void) |
895 | { | |
896 | largepages_enabled = false; | |
897 | } | |
898 | EXPORT_SYMBOL_GPL(kvm_disable_largepages); | |
899 | ||
cea7bb21 IE |
900 | int is_error_page(struct page *page) |
901 | { | |
edba23e5 | 902 | return page == bad_page || page == hwpoison_page || page == fault_page; |
cea7bb21 IE |
903 | } |
904 | EXPORT_SYMBOL_GPL(is_error_page); | |
905 | ||
35149e21 AL |
906 | int is_error_pfn(pfn_t pfn) |
907 | { | |
edba23e5 | 908 | return pfn == bad_pfn || pfn == hwpoison_pfn || pfn == fault_pfn; |
35149e21 AL |
909 | } |
910 | EXPORT_SYMBOL_GPL(is_error_pfn); | |
911 | ||
bf998156 HY |
912 | int is_hwpoison_pfn(pfn_t pfn) |
913 | { | |
914 | return pfn == hwpoison_pfn; | |
915 | } | |
916 | EXPORT_SYMBOL_GPL(is_hwpoison_pfn); | |
917 | ||
edba23e5 GN |
918 | int is_fault_pfn(pfn_t pfn) |
919 | { | |
920 | return pfn == fault_pfn; | |
921 | } | |
922 | EXPORT_SYMBOL_GPL(is_fault_pfn); | |
923 | ||
f9d46eb0 IE |
924 | static inline unsigned long bad_hva(void) |
925 | { | |
926 | return PAGE_OFFSET; | |
927 | } | |
928 | ||
929 | int kvm_is_error_hva(unsigned long addr) | |
930 | { | |
931 | return addr == bad_hva(); | |
932 | } | |
933 | EXPORT_SYMBOL_GPL(kvm_is_error_hva); | |
934 | ||
49c7754c GN |
935 | static struct kvm_memory_slot *__gfn_to_memslot(struct kvm_memslots *slots, |
936 | gfn_t gfn) | |
6aa8b732 AK |
937 | { |
938 | int i; | |
939 | ||
46a26bf5 MT |
940 | for (i = 0; i < slots->nmemslots; ++i) { |
941 | struct kvm_memory_slot *memslot = &slots->memslots[i]; | |
6aa8b732 AK |
942 | |
943 | if (gfn >= memslot->base_gfn | |
944 | && gfn < memslot->base_gfn + memslot->npages) | |
945 | return memslot; | |
946 | } | |
8b6d44c7 | 947 | return NULL; |
6aa8b732 | 948 | } |
49c7754c GN |
949 | |
950 | struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn) | |
951 | { | |
952 | return __gfn_to_memslot(kvm_memslots(kvm), gfn); | |
953 | } | |
a1f4d395 | 954 | EXPORT_SYMBOL_GPL(gfn_to_memslot); |
6aa8b732 | 955 | |
e0d62c7f IE |
956 | int kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn) |
957 | { | |
958 | int i; | |
90d83dc3 | 959 | struct kvm_memslots *slots = kvm_memslots(kvm); |
e0d62c7f | 960 | |
e0d62c7f | 961 | for (i = 0; i < KVM_MEMORY_SLOTS; ++i) { |
46a26bf5 | 962 | struct kvm_memory_slot *memslot = &slots->memslots[i]; |
e0d62c7f | 963 | |
bc6678a3 MT |
964 | if (memslot->flags & KVM_MEMSLOT_INVALID) |
965 | continue; | |
966 | ||
e0d62c7f IE |
967 | if (gfn >= memslot->base_gfn |
968 | && gfn < memslot->base_gfn + memslot->npages) | |
969 | return 1; | |
970 | } | |
971 | return 0; | |
972 | } | |
973 | EXPORT_SYMBOL_GPL(kvm_is_visible_gfn); | |
974 | ||
8f0b1ab6 JR |
975 | unsigned long kvm_host_page_size(struct kvm *kvm, gfn_t gfn) |
976 | { | |
977 | struct vm_area_struct *vma; | |
978 | unsigned long addr, size; | |
979 | ||
980 | size = PAGE_SIZE; | |
981 | ||
982 | addr = gfn_to_hva(kvm, gfn); | |
983 | if (kvm_is_error_hva(addr)) | |
984 | return PAGE_SIZE; | |
985 | ||
986 | down_read(¤t->mm->mmap_sem); | |
987 | vma = find_vma(current->mm, addr); | |
988 | if (!vma) | |
989 | goto out; | |
990 | ||
991 | size = vma_kernel_pagesize(vma); | |
992 | ||
993 | out: | |
994 | up_read(¤t->mm->mmap_sem); | |
995 | ||
996 | return size; | |
997 | } | |
998 | ||
bc6678a3 MT |
999 | int memslot_id(struct kvm *kvm, gfn_t gfn) |
1000 | { | |
1001 | int i; | |
90d83dc3 | 1002 | struct kvm_memslots *slots = kvm_memslots(kvm); |
bc6678a3 MT |
1003 | struct kvm_memory_slot *memslot = NULL; |
1004 | ||
bc6678a3 MT |
1005 | for (i = 0; i < slots->nmemslots; ++i) { |
1006 | memslot = &slots->memslots[i]; | |
1007 | ||
1008 | if (gfn >= memslot->base_gfn | |
1009 | && gfn < memslot->base_gfn + memslot->npages) | |
1010 | break; | |
1011 | } | |
1012 | ||
1013 | return memslot - slots->memslots; | |
1014 | } | |
1015 | ||
49c7754c | 1016 | static unsigned long gfn_to_hva_many(struct kvm_memory_slot *slot, gfn_t gfn, |
48987781 | 1017 | gfn_t *nr_pages) |
539cb660 | 1018 | { |
bc6678a3 | 1019 | if (!slot || slot->flags & KVM_MEMSLOT_INVALID) |
539cb660 | 1020 | return bad_hva(); |
48987781 XG |
1021 | |
1022 | if (nr_pages) | |
1023 | *nr_pages = slot->npages - (gfn - slot->base_gfn); | |
1024 | ||
f5c98031 | 1025 | return gfn_to_hva_memslot(slot, gfn); |
539cb660 | 1026 | } |
48987781 XG |
1027 | |
1028 | unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn) | |
1029 | { | |
49c7754c | 1030 | return gfn_to_hva_many(gfn_to_memslot(kvm, gfn), gfn, NULL); |
48987781 | 1031 | } |
0d150298 | 1032 | EXPORT_SYMBOL_GPL(gfn_to_hva); |
539cb660 | 1033 | |
8030089f GN |
1034 | static pfn_t get_fault_pfn(void) |
1035 | { | |
1036 | get_page(fault_page); | |
1037 | return fault_pfn; | |
1038 | } | |
1039 | ||
fafc3dba HY |
1040 | static inline int check_user_page_hwpoison(unsigned long addr) |
1041 | { | |
1042 | int rc, flags = FOLL_TOUCH | FOLL_HWPOISON | FOLL_WRITE; | |
1043 | ||
1044 | rc = __get_user_pages(current, current->mm, addr, 1, | |
1045 | flags, NULL, NULL, NULL); | |
1046 | return rc == -EHWPOISON; | |
1047 | } | |
1048 | ||
af585b92 | 1049 | static pfn_t hva_to_pfn(struct kvm *kvm, unsigned long addr, bool atomic, |
612819c3 | 1050 | bool *async, bool write_fault, bool *writable) |
954bbbc2 | 1051 | { |
8d4e1288 | 1052 | struct page *page[1]; |
af585b92 | 1053 | int npages = 0; |
2e2e3738 | 1054 | pfn_t pfn; |
954bbbc2 | 1055 | |
af585b92 GN |
1056 | /* we can do it either atomically or asynchronously, not both */ |
1057 | BUG_ON(atomic && async); | |
1058 | ||
612819c3 MT |
1059 | BUG_ON(!write_fault && !writable); |
1060 | ||
1061 | if (writable) | |
1062 | *writable = true; | |
1063 | ||
af585b92 | 1064 | if (atomic || async) |
887c08ac | 1065 | npages = __get_user_pages_fast(addr, 1, 1, page); |
af585b92 GN |
1066 | |
1067 | if (unlikely(npages != 1) && !atomic) { | |
887c08ac | 1068 | might_sleep(); |
612819c3 MT |
1069 | |
1070 | if (writable) | |
1071 | *writable = write_fault; | |
1072 | ||
1073 | npages = get_user_pages_fast(addr, 1, write_fault, page); | |
1074 | ||
1075 | /* map read fault as writable if possible */ | |
1076 | if (unlikely(!write_fault) && npages == 1) { | |
1077 | struct page *wpage[1]; | |
1078 | ||
1079 | npages = __get_user_pages_fast(addr, 1, 1, wpage); | |
1080 | if (npages == 1) { | |
1081 | *writable = true; | |
1082 | put_page(page[0]); | |
1083 | page[0] = wpage[0]; | |
1084 | } | |
1085 | npages = 1; | |
1086 | } | |
887c08ac | 1087 | } |
539cb660 | 1088 | |
2e2e3738 AL |
1089 | if (unlikely(npages != 1)) { |
1090 | struct vm_area_struct *vma; | |
1091 | ||
887c08ac | 1092 | if (atomic) |
8030089f | 1093 | return get_fault_pfn(); |
887c08ac | 1094 | |
bbeb3406 | 1095 | down_read(¤t->mm->mmap_sem); |
fafc3dba | 1096 | if (check_user_page_hwpoison(addr)) { |
bbeb3406 | 1097 | up_read(¤t->mm->mmap_sem); |
bf998156 HY |
1098 | get_page(hwpoison_page); |
1099 | return page_to_pfn(hwpoison_page); | |
1100 | } | |
1101 | ||
8030089f | 1102 | vma = find_vma_intersection(current->mm, addr, addr+1); |
4c2155ce | 1103 | |
8030089f GN |
1104 | if (vma == NULL) |
1105 | pfn = get_fault_pfn(); | |
1106 | else if ((vma->vm_flags & VM_PFNMAP)) { | |
1107 | pfn = ((addr - vma->vm_start) >> PAGE_SHIFT) + | |
1108 | vma->vm_pgoff; | |
1109 | BUG_ON(!kvm_is_mmio_pfn(pfn)); | |
1110 | } else { | |
1111 | if (async && (vma->vm_flags & VM_WRITE)) | |
af585b92 | 1112 | *async = true; |
8030089f | 1113 | pfn = get_fault_pfn(); |
2e2e3738 | 1114 | } |
4c2155ce | 1115 | up_read(¤t->mm->mmap_sem); |
2e2e3738 AL |
1116 | } else |
1117 | pfn = page_to_pfn(page[0]); | |
8d4e1288 | 1118 | |
2e2e3738 | 1119 | return pfn; |
35149e21 AL |
1120 | } |
1121 | ||
887c08ac XG |
1122 | pfn_t hva_to_pfn_atomic(struct kvm *kvm, unsigned long addr) |
1123 | { | |
612819c3 | 1124 | return hva_to_pfn(kvm, addr, true, NULL, true, NULL); |
887c08ac XG |
1125 | } |
1126 | EXPORT_SYMBOL_GPL(hva_to_pfn_atomic); | |
1127 | ||
612819c3 MT |
1128 | static pfn_t __gfn_to_pfn(struct kvm *kvm, gfn_t gfn, bool atomic, bool *async, |
1129 | bool write_fault, bool *writable) | |
506f0d6f MT |
1130 | { |
1131 | unsigned long addr; | |
1132 | ||
af585b92 GN |
1133 | if (async) |
1134 | *async = false; | |
1135 | ||
506f0d6f MT |
1136 | addr = gfn_to_hva(kvm, gfn); |
1137 | if (kvm_is_error_hva(addr)) { | |
1138 | get_page(bad_page); | |
1139 | return page_to_pfn(bad_page); | |
1140 | } | |
1141 | ||
612819c3 | 1142 | return hva_to_pfn(kvm, addr, atomic, async, write_fault, writable); |
365fb3fd XG |
1143 | } |
1144 | ||
1145 | pfn_t gfn_to_pfn_atomic(struct kvm *kvm, gfn_t gfn) | |
1146 | { | |
612819c3 | 1147 | return __gfn_to_pfn(kvm, gfn, true, NULL, true, NULL); |
365fb3fd XG |
1148 | } |
1149 | EXPORT_SYMBOL_GPL(gfn_to_pfn_atomic); | |
1150 | ||
612819c3 MT |
1151 | pfn_t gfn_to_pfn_async(struct kvm *kvm, gfn_t gfn, bool *async, |
1152 | bool write_fault, bool *writable) | |
af585b92 | 1153 | { |
612819c3 | 1154 | return __gfn_to_pfn(kvm, gfn, false, async, write_fault, writable); |
af585b92 GN |
1155 | } |
1156 | EXPORT_SYMBOL_GPL(gfn_to_pfn_async); | |
1157 | ||
365fb3fd XG |
1158 | pfn_t gfn_to_pfn(struct kvm *kvm, gfn_t gfn) |
1159 | { | |
612819c3 | 1160 | return __gfn_to_pfn(kvm, gfn, false, NULL, true, NULL); |
506f0d6f | 1161 | } |
35149e21 AL |
1162 | EXPORT_SYMBOL_GPL(gfn_to_pfn); |
1163 | ||
612819c3 MT |
1164 | pfn_t gfn_to_pfn_prot(struct kvm *kvm, gfn_t gfn, bool write_fault, |
1165 | bool *writable) | |
1166 | { | |
1167 | return __gfn_to_pfn(kvm, gfn, false, NULL, write_fault, writable); | |
1168 | } | |
1169 | EXPORT_SYMBOL_GPL(gfn_to_pfn_prot); | |
1170 | ||
506f0d6f MT |
1171 | pfn_t gfn_to_pfn_memslot(struct kvm *kvm, |
1172 | struct kvm_memory_slot *slot, gfn_t gfn) | |
1173 | { | |
1174 | unsigned long addr = gfn_to_hva_memslot(slot, gfn); | |
612819c3 | 1175 | return hva_to_pfn(kvm, addr, false, NULL, true, NULL); |
506f0d6f MT |
1176 | } |
1177 | ||
48987781 XG |
1178 | int gfn_to_page_many_atomic(struct kvm *kvm, gfn_t gfn, struct page **pages, |
1179 | int nr_pages) | |
1180 | { | |
1181 | unsigned long addr; | |
1182 | gfn_t entry; | |
1183 | ||
49c7754c | 1184 | addr = gfn_to_hva_many(gfn_to_memslot(kvm, gfn), gfn, &entry); |
48987781 XG |
1185 | if (kvm_is_error_hva(addr)) |
1186 | return -1; | |
1187 | ||
1188 | if (entry < nr_pages) | |
1189 | return 0; | |
1190 | ||
1191 | return __get_user_pages_fast(addr, nr_pages, 1, pages); | |
1192 | } | |
1193 | EXPORT_SYMBOL_GPL(gfn_to_page_many_atomic); | |
1194 | ||
35149e21 AL |
1195 | struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn) |
1196 | { | |
2e2e3738 AL |
1197 | pfn_t pfn; |
1198 | ||
1199 | pfn = gfn_to_pfn(kvm, gfn); | |
c77fb9dc | 1200 | if (!kvm_is_mmio_pfn(pfn)) |
2e2e3738 AL |
1201 | return pfn_to_page(pfn); |
1202 | ||
c77fb9dc | 1203 | WARN_ON(kvm_is_mmio_pfn(pfn)); |
2e2e3738 AL |
1204 | |
1205 | get_page(bad_page); | |
1206 | return bad_page; | |
954bbbc2 | 1207 | } |
aab61cc0 | 1208 | |
954bbbc2 AK |
1209 | EXPORT_SYMBOL_GPL(gfn_to_page); |
1210 | ||
b4231d61 IE |
1211 | void kvm_release_page_clean(struct page *page) |
1212 | { | |
35149e21 | 1213 | kvm_release_pfn_clean(page_to_pfn(page)); |
b4231d61 IE |
1214 | } |
1215 | EXPORT_SYMBOL_GPL(kvm_release_page_clean); | |
1216 | ||
35149e21 AL |
1217 | void kvm_release_pfn_clean(pfn_t pfn) |
1218 | { | |
c77fb9dc | 1219 | if (!kvm_is_mmio_pfn(pfn)) |
2e2e3738 | 1220 | put_page(pfn_to_page(pfn)); |
35149e21 AL |
1221 | } |
1222 | EXPORT_SYMBOL_GPL(kvm_release_pfn_clean); | |
1223 | ||
b4231d61 | 1224 | void kvm_release_page_dirty(struct page *page) |
8a7ae055 | 1225 | { |
35149e21 AL |
1226 | kvm_release_pfn_dirty(page_to_pfn(page)); |
1227 | } | |
1228 | EXPORT_SYMBOL_GPL(kvm_release_page_dirty); | |
1229 | ||
1230 | void kvm_release_pfn_dirty(pfn_t pfn) | |
1231 | { | |
1232 | kvm_set_pfn_dirty(pfn); | |
1233 | kvm_release_pfn_clean(pfn); | |
1234 | } | |
1235 | EXPORT_SYMBOL_GPL(kvm_release_pfn_dirty); | |
1236 | ||
1237 | void kvm_set_page_dirty(struct page *page) | |
1238 | { | |
1239 | kvm_set_pfn_dirty(page_to_pfn(page)); | |
1240 | } | |
1241 | EXPORT_SYMBOL_GPL(kvm_set_page_dirty); | |
1242 | ||
1243 | void kvm_set_pfn_dirty(pfn_t pfn) | |
1244 | { | |
c77fb9dc | 1245 | if (!kvm_is_mmio_pfn(pfn)) { |
2e2e3738 AL |
1246 | struct page *page = pfn_to_page(pfn); |
1247 | if (!PageReserved(page)) | |
1248 | SetPageDirty(page); | |
1249 | } | |
8a7ae055 | 1250 | } |
35149e21 AL |
1251 | EXPORT_SYMBOL_GPL(kvm_set_pfn_dirty); |
1252 | ||
1253 | void kvm_set_pfn_accessed(pfn_t pfn) | |
1254 | { | |
c77fb9dc | 1255 | if (!kvm_is_mmio_pfn(pfn)) |
2e2e3738 | 1256 | mark_page_accessed(pfn_to_page(pfn)); |
35149e21 AL |
1257 | } |
1258 | EXPORT_SYMBOL_GPL(kvm_set_pfn_accessed); | |
1259 | ||
1260 | void kvm_get_pfn(pfn_t pfn) | |
1261 | { | |
c77fb9dc | 1262 | if (!kvm_is_mmio_pfn(pfn)) |
2e2e3738 | 1263 | get_page(pfn_to_page(pfn)); |
35149e21 AL |
1264 | } |
1265 | EXPORT_SYMBOL_GPL(kvm_get_pfn); | |
8a7ae055 | 1266 | |
195aefde IE |
1267 | static int next_segment(unsigned long len, int offset) |
1268 | { | |
1269 | if (len > PAGE_SIZE - offset) | |
1270 | return PAGE_SIZE - offset; | |
1271 | else | |
1272 | return len; | |
1273 | } | |
1274 | ||
1275 | int kvm_read_guest_page(struct kvm *kvm, gfn_t gfn, void *data, int offset, | |
1276 | int len) | |
1277 | { | |
e0506bcb IE |
1278 | int r; |
1279 | unsigned long addr; | |
195aefde | 1280 | |
e0506bcb IE |
1281 | addr = gfn_to_hva(kvm, gfn); |
1282 | if (kvm_is_error_hva(addr)) | |
1283 | return -EFAULT; | |
1284 | r = copy_from_user(data, (void __user *)addr + offset, len); | |
1285 | if (r) | |
195aefde | 1286 | return -EFAULT; |
195aefde IE |
1287 | return 0; |
1288 | } | |
1289 | EXPORT_SYMBOL_GPL(kvm_read_guest_page); | |
1290 | ||
1291 | int kvm_read_guest(struct kvm *kvm, gpa_t gpa, void *data, unsigned long len) | |
1292 | { | |
1293 | gfn_t gfn = gpa >> PAGE_SHIFT; | |
1294 | int seg; | |
1295 | int offset = offset_in_page(gpa); | |
1296 | int ret; | |
1297 | ||
1298 | while ((seg = next_segment(len, offset)) != 0) { | |
1299 | ret = kvm_read_guest_page(kvm, gfn, data, offset, seg); | |
1300 | if (ret < 0) | |
1301 | return ret; | |
1302 | offset = 0; | |
1303 | len -= seg; | |
1304 | data += seg; | |
1305 | ++gfn; | |
1306 | } | |
1307 | return 0; | |
1308 | } | |
1309 | EXPORT_SYMBOL_GPL(kvm_read_guest); | |
1310 | ||
7ec54588 MT |
1311 | int kvm_read_guest_atomic(struct kvm *kvm, gpa_t gpa, void *data, |
1312 | unsigned long len) | |
1313 | { | |
1314 | int r; | |
1315 | unsigned long addr; | |
1316 | gfn_t gfn = gpa >> PAGE_SHIFT; | |
1317 | int offset = offset_in_page(gpa); | |
1318 | ||
1319 | addr = gfn_to_hva(kvm, gfn); | |
1320 | if (kvm_is_error_hva(addr)) | |
1321 | return -EFAULT; | |
0aac03f0 | 1322 | pagefault_disable(); |
7ec54588 | 1323 | r = __copy_from_user_inatomic(data, (void __user *)addr + offset, len); |
0aac03f0 | 1324 | pagefault_enable(); |
7ec54588 MT |
1325 | if (r) |
1326 | return -EFAULT; | |
1327 | return 0; | |
1328 | } | |
1329 | EXPORT_SYMBOL(kvm_read_guest_atomic); | |
1330 | ||
195aefde IE |
1331 | int kvm_write_guest_page(struct kvm *kvm, gfn_t gfn, const void *data, |
1332 | int offset, int len) | |
1333 | { | |
e0506bcb IE |
1334 | int r; |
1335 | unsigned long addr; | |
195aefde | 1336 | |
e0506bcb IE |
1337 | addr = gfn_to_hva(kvm, gfn); |
1338 | if (kvm_is_error_hva(addr)) | |
1339 | return -EFAULT; | |
1340 | r = copy_to_user((void __user *)addr + offset, data, len); | |
1341 | if (r) | |
195aefde | 1342 | return -EFAULT; |
195aefde IE |
1343 | mark_page_dirty(kvm, gfn); |
1344 | return 0; | |
1345 | } | |
1346 | EXPORT_SYMBOL_GPL(kvm_write_guest_page); | |
1347 | ||
1348 | int kvm_write_guest(struct kvm *kvm, gpa_t gpa, const void *data, | |
1349 | unsigned long len) | |
1350 | { | |
1351 | gfn_t gfn = gpa >> PAGE_SHIFT; | |
1352 | int seg; | |
1353 | int offset = offset_in_page(gpa); | |
1354 | int ret; | |
1355 | ||
1356 | while ((seg = next_segment(len, offset)) != 0) { | |
1357 | ret = kvm_write_guest_page(kvm, gfn, data, offset, seg); | |
1358 | if (ret < 0) | |
1359 | return ret; | |
1360 | offset = 0; | |
1361 | len -= seg; | |
1362 | data += seg; | |
1363 | ++gfn; | |
1364 | } | |
1365 | return 0; | |
1366 | } | |
1367 | ||
49c7754c GN |
1368 | int kvm_gfn_to_hva_cache_init(struct kvm *kvm, struct gfn_to_hva_cache *ghc, |
1369 | gpa_t gpa) | |
1370 | { | |
1371 | struct kvm_memslots *slots = kvm_memslots(kvm); | |
1372 | int offset = offset_in_page(gpa); | |
1373 | gfn_t gfn = gpa >> PAGE_SHIFT; | |
1374 | ||
1375 | ghc->gpa = gpa; | |
1376 | ghc->generation = slots->generation; | |
1377 | ghc->memslot = __gfn_to_memslot(slots, gfn); | |
1378 | ghc->hva = gfn_to_hva_many(ghc->memslot, gfn, NULL); | |
1379 | if (!kvm_is_error_hva(ghc->hva)) | |
1380 | ghc->hva += offset; | |
1381 | else | |
1382 | return -EFAULT; | |
1383 | ||
1384 | return 0; | |
1385 | } | |
1386 | EXPORT_SYMBOL_GPL(kvm_gfn_to_hva_cache_init); | |
1387 | ||
1388 | int kvm_write_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc, | |
1389 | void *data, unsigned long len) | |
1390 | { | |
1391 | struct kvm_memslots *slots = kvm_memslots(kvm); | |
1392 | int r; | |
1393 | ||
1394 | if (slots->generation != ghc->generation) | |
1395 | kvm_gfn_to_hva_cache_init(kvm, ghc, ghc->gpa); | |
1396 | ||
1397 | if (kvm_is_error_hva(ghc->hva)) | |
1398 | return -EFAULT; | |
1399 | ||
1400 | r = copy_to_user((void __user *)ghc->hva, data, len); | |
1401 | if (r) | |
1402 | return -EFAULT; | |
1403 | mark_page_dirty_in_slot(kvm, ghc->memslot, ghc->gpa >> PAGE_SHIFT); | |
1404 | ||
1405 | return 0; | |
1406 | } | |
1407 | EXPORT_SYMBOL_GPL(kvm_write_guest_cached); | |
1408 | ||
195aefde IE |
1409 | int kvm_clear_guest_page(struct kvm *kvm, gfn_t gfn, int offset, int len) |
1410 | { | |
3bcc8a8c HC |
1411 | return kvm_write_guest_page(kvm, gfn, (const void *) empty_zero_page, |
1412 | offset, len); | |
195aefde IE |
1413 | } |
1414 | EXPORT_SYMBOL_GPL(kvm_clear_guest_page); | |
1415 | ||
1416 | int kvm_clear_guest(struct kvm *kvm, gpa_t gpa, unsigned long len) | |
1417 | { | |
1418 | gfn_t gfn = gpa >> PAGE_SHIFT; | |
1419 | int seg; | |
1420 | int offset = offset_in_page(gpa); | |
1421 | int ret; | |
1422 | ||
1423 | while ((seg = next_segment(len, offset)) != 0) { | |
1424 | ret = kvm_clear_guest_page(kvm, gfn, offset, seg); | |
1425 | if (ret < 0) | |
1426 | return ret; | |
1427 | offset = 0; | |
1428 | len -= seg; | |
1429 | ++gfn; | |
1430 | } | |
1431 | return 0; | |
1432 | } | |
1433 | EXPORT_SYMBOL_GPL(kvm_clear_guest); | |
1434 | ||
49c7754c GN |
1435 | void mark_page_dirty_in_slot(struct kvm *kvm, struct kvm_memory_slot *memslot, |
1436 | gfn_t gfn) | |
6aa8b732 | 1437 | { |
7e9d619d RR |
1438 | if (memslot && memslot->dirty_bitmap) { |
1439 | unsigned long rel_gfn = gfn - memslot->base_gfn; | |
6aa8b732 | 1440 | |
cd7e48c5 | 1441 | __set_bit_le(rel_gfn, memslot->dirty_bitmap); |
6aa8b732 AK |
1442 | } |
1443 | } | |
1444 | ||
49c7754c GN |
1445 | void mark_page_dirty(struct kvm *kvm, gfn_t gfn) |
1446 | { | |
1447 | struct kvm_memory_slot *memslot; | |
1448 | ||
1449 | memslot = gfn_to_memslot(kvm, gfn); | |
1450 | mark_page_dirty_in_slot(kvm, memslot, gfn); | |
1451 | } | |
1452 | ||
b6958ce4 ED |
1453 | /* |
1454 | * The vCPU has executed a HLT instruction with in-kernel mode enabled. | |
1455 | */ | |
8776e519 | 1456 | void kvm_vcpu_block(struct kvm_vcpu *vcpu) |
d3bef15f | 1457 | { |
e5c239cf MT |
1458 | DEFINE_WAIT(wait); |
1459 | ||
1460 | for (;;) { | |
1461 | prepare_to_wait(&vcpu->wq, &wait, TASK_INTERRUPTIBLE); | |
1462 | ||
a1b37100 | 1463 | if (kvm_arch_vcpu_runnable(vcpu)) { |
a8eeb04a | 1464 | kvm_make_request(KVM_REQ_UNHALT, vcpu); |
e5c239cf | 1465 | break; |
d7690175 | 1466 | } |
09cec754 GN |
1467 | if (kvm_cpu_has_pending_timer(vcpu)) |
1468 | break; | |
e5c239cf MT |
1469 | if (signal_pending(current)) |
1470 | break; | |
1471 | ||
b6958ce4 | 1472 | schedule(); |
b6958ce4 | 1473 | } |
d3bef15f | 1474 | |
e5c239cf | 1475 | finish_wait(&vcpu->wq, &wait); |
b6958ce4 ED |
1476 | } |
1477 | ||
6aa8b732 AK |
1478 | void kvm_resched(struct kvm_vcpu *vcpu) |
1479 | { | |
3fca0365 YD |
1480 | if (!need_resched()) |
1481 | return; | |
6aa8b732 | 1482 | cond_resched(); |
6aa8b732 AK |
1483 | } |
1484 | EXPORT_SYMBOL_GPL(kvm_resched); | |
1485 | ||
217ece61 | 1486 | void kvm_vcpu_on_spin(struct kvm_vcpu *me) |
d255f4f2 | 1487 | { |
217ece61 RR |
1488 | struct kvm *kvm = me->kvm; |
1489 | struct kvm_vcpu *vcpu; | |
1490 | int last_boosted_vcpu = me->kvm->last_boosted_vcpu; | |
1491 | int yielded = 0; | |
1492 | int pass; | |
1493 | int i; | |
d255f4f2 | 1494 | |
217ece61 RR |
1495 | /* |
1496 | * We boost the priority of a VCPU that is runnable but not | |
1497 | * currently running, because it got preempted by something | |
1498 | * else and called schedule in __vcpu_run. Hopefully that | |
1499 | * VCPU is holding the lock that we need and will release it. | |
1500 | * We approximate round-robin by starting at the last boosted VCPU. | |
1501 | */ | |
1502 | for (pass = 0; pass < 2 && !yielded; pass++) { | |
1503 | kvm_for_each_vcpu(i, vcpu, kvm) { | |
1504 | struct task_struct *task = NULL; | |
1505 | struct pid *pid; | |
1506 | if (!pass && i < last_boosted_vcpu) { | |
1507 | i = last_boosted_vcpu; | |
1508 | continue; | |
1509 | } else if (pass && i > last_boosted_vcpu) | |
1510 | break; | |
1511 | if (vcpu == me) | |
1512 | continue; | |
1513 | if (waitqueue_active(&vcpu->wq)) | |
1514 | continue; | |
1515 | rcu_read_lock(); | |
1516 | pid = rcu_dereference(vcpu->pid); | |
1517 | if (pid) | |
1518 | task = get_pid_task(vcpu->pid, PIDTYPE_PID); | |
1519 | rcu_read_unlock(); | |
1520 | if (!task) | |
1521 | continue; | |
1522 | if (task->flags & PF_VCPU) { | |
1523 | put_task_struct(task); | |
1524 | continue; | |
1525 | } | |
1526 | if (yield_to(task, 1)) { | |
1527 | put_task_struct(task); | |
1528 | kvm->last_boosted_vcpu = i; | |
1529 | yielded = 1; | |
1530 | break; | |
1531 | } | |
1532 | put_task_struct(task); | |
1533 | } | |
1534 | } | |
d255f4f2 ZE |
1535 | } |
1536 | EXPORT_SYMBOL_GPL(kvm_vcpu_on_spin); | |
1537 | ||
e4a533a4 | 1538 | static int kvm_vcpu_fault(struct vm_area_struct *vma, struct vm_fault *vmf) |
9a2bb7f4 AK |
1539 | { |
1540 | struct kvm_vcpu *vcpu = vma->vm_file->private_data; | |
9a2bb7f4 AK |
1541 | struct page *page; |
1542 | ||
e4a533a4 | 1543 | if (vmf->pgoff == 0) |
039576c0 | 1544 | page = virt_to_page(vcpu->run); |
09566765 | 1545 | #ifdef CONFIG_X86 |
e4a533a4 | 1546 | else if (vmf->pgoff == KVM_PIO_PAGE_OFFSET) |
ad312c7c | 1547 | page = virt_to_page(vcpu->arch.pio_data); |
5f94c174 LV |
1548 | #endif |
1549 | #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET | |
1550 | else if (vmf->pgoff == KVM_COALESCED_MMIO_PAGE_OFFSET) | |
1551 | page = virt_to_page(vcpu->kvm->coalesced_mmio_ring); | |
09566765 | 1552 | #endif |
039576c0 | 1553 | else |
e4a533a4 | 1554 | return VM_FAULT_SIGBUS; |
9a2bb7f4 | 1555 | get_page(page); |
e4a533a4 | 1556 | vmf->page = page; |
1557 | return 0; | |
9a2bb7f4 AK |
1558 | } |
1559 | ||
f0f37e2f | 1560 | static const struct vm_operations_struct kvm_vcpu_vm_ops = { |
e4a533a4 | 1561 | .fault = kvm_vcpu_fault, |
9a2bb7f4 AK |
1562 | }; |
1563 | ||
1564 | static int kvm_vcpu_mmap(struct file *file, struct vm_area_struct *vma) | |
1565 | { | |
1566 | vma->vm_ops = &kvm_vcpu_vm_ops; | |
1567 | return 0; | |
1568 | } | |
1569 | ||
bccf2150 AK |
1570 | static int kvm_vcpu_release(struct inode *inode, struct file *filp) |
1571 | { | |
1572 | struct kvm_vcpu *vcpu = filp->private_data; | |
1573 | ||
66c0b394 | 1574 | kvm_put_kvm(vcpu->kvm); |
bccf2150 AK |
1575 | return 0; |
1576 | } | |
1577 | ||
3d3aab1b | 1578 | static struct file_operations kvm_vcpu_fops = { |
bccf2150 AK |
1579 | .release = kvm_vcpu_release, |
1580 | .unlocked_ioctl = kvm_vcpu_ioctl, | |
1581 | .compat_ioctl = kvm_vcpu_ioctl, | |
9a2bb7f4 | 1582 | .mmap = kvm_vcpu_mmap, |
6038f373 | 1583 | .llseek = noop_llseek, |
bccf2150 AK |
1584 | }; |
1585 | ||
1586 | /* | |
1587 | * Allocates an inode for the vcpu. | |
1588 | */ | |
1589 | static int create_vcpu_fd(struct kvm_vcpu *vcpu) | |
1590 | { | |
628ff7c1 | 1591 | return anon_inode_getfd("kvm-vcpu", &kvm_vcpu_fops, vcpu, O_RDWR); |
bccf2150 AK |
1592 | } |
1593 | ||
c5ea7660 AK |
1594 | /* |
1595 | * Creates some virtual cpus. Good luck creating more than one. | |
1596 | */ | |
73880c80 | 1597 | static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, u32 id) |
c5ea7660 AK |
1598 | { |
1599 | int r; | |
988a2cae | 1600 | struct kvm_vcpu *vcpu, *v; |
c5ea7660 | 1601 | |
73880c80 | 1602 | vcpu = kvm_arch_vcpu_create(kvm, id); |
fb3f0f51 RR |
1603 | if (IS_ERR(vcpu)) |
1604 | return PTR_ERR(vcpu); | |
c5ea7660 | 1605 | |
15ad7146 AK |
1606 | preempt_notifier_init(&vcpu->preempt_notifier, &kvm_preempt_ops); |
1607 | ||
26e5215f AK |
1608 | r = kvm_arch_vcpu_setup(vcpu); |
1609 | if (r) | |
7d8fece6 | 1610 | return r; |
26e5215f | 1611 | |
11ec2804 | 1612 | mutex_lock(&kvm->lock); |
73880c80 GN |
1613 | if (atomic_read(&kvm->online_vcpus) == KVM_MAX_VCPUS) { |
1614 | r = -EINVAL; | |
e9b11c17 | 1615 | goto vcpu_destroy; |
fb3f0f51 | 1616 | } |
73880c80 | 1617 | |
988a2cae GN |
1618 | kvm_for_each_vcpu(r, v, kvm) |
1619 | if (v->vcpu_id == id) { | |
73880c80 GN |
1620 | r = -EEXIST; |
1621 | goto vcpu_destroy; | |
1622 | } | |
1623 | ||
1624 | BUG_ON(kvm->vcpus[atomic_read(&kvm->online_vcpus)]); | |
c5ea7660 | 1625 | |
fb3f0f51 | 1626 | /* Now it's all set up, let userspace reach it */ |
66c0b394 | 1627 | kvm_get_kvm(kvm); |
bccf2150 | 1628 | r = create_vcpu_fd(vcpu); |
73880c80 GN |
1629 | if (r < 0) { |
1630 | kvm_put_kvm(kvm); | |
1631 | goto vcpu_destroy; | |
1632 | } | |
1633 | ||
1634 | kvm->vcpus[atomic_read(&kvm->online_vcpus)] = vcpu; | |
1635 | smp_wmb(); | |
1636 | atomic_inc(&kvm->online_vcpus); | |
1637 | ||
1638 | #ifdef CONFIG_KVM_APIC_ARCHITECTURE | |
1639 | if (kvm->bsp_vcpu_id == id) | |
1640 | kvm->bsp_vcpu = vcpu; | |
1641 | #endif | |
1642 | mutex_unlock(&kvm->lock); | |
fb3f0f51 | 1643 | return r; |
39c3b86e | 1644 | |
e9b11c17 | 1645 | vcpu_destroy: |
7d8fece6 | 1646 | mutex_unlock(&kvm->lock); |
d40ccc62 | 1647 | kvm_arch_vcpu_destroy(vcpu); |
c5ea7660 AK |
1648 | return r; |
1649 | } | |
1650 | ||
1961d276 AK |
1651 | static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu *vcpu, sigset_t *sigset) |
1652 | { | |
1653 | if (sigset) { | |
1654 | sigdelsetmask(sigset, sigmask(SIGKILL)|sigmask(SIGSTOP)); | |
1655 | vcpu->sigset_active = 1; | |
1656 | vcpu->sigset = *sigset; | |
1657 | } else | |
1658 | vcpu->sigset_active = 0; | |
1659 | return 0; | |
1660 | } | |
1661 | ||
bccf2150 AK |
1662 | static long kvm_vcpu_ioctl(struct file *filp, |
1663 | unsigned int ioctl, unsigned long arg) | |
6aa8b732 | 1664 | { |
bccf2150 | 1665 | struct kvm_vcpu *vcpu = filp->private_data; |
2f366987 | 1666 | void __user *argp = (void __user *)arg; |
313a3dc7 | 1667 | int r; |
fa3795a7 DH |
1668 | struct kvm_fpu *fpu = NULL; |
1669 | struct kvm_sregs *kvm_sregs = NULL; | |
6aa8b732 | 1670 | |
6d4e4c4f AK |
1671 | if (vcpu->kvm->mm != current->mm) |
1672 | return -EIO; | |
2122ff5e AK |
1673 | |
1674 | #if defined(CONFIG_S390) || defined(CONFIG_PPC) | |
1675 | /* | |
1676 | * Special cases: vcpu ioctls that are asynchronous to vcpu execution, | |
1677 | * so vcpu_load() would break it. | |
1678 | */ | |
1679 | if (ioctl == KVM_S390_INTERRUPT || ioctl == KVM_INTERRUPT) | |
1680 | return kvm_arch_vcpu_ioctl(filp, ioctl, arg); | |
1681 | #endif | |
1682 | ||
1683 | ||
1684 | vcpu_load(vcpu); | |
6aa8b732 | 1685 | switch (ioctl) { |
9a2bb7f4 | 1686 | case KVM_RUN: |
f0fe5108 AK |
1687 | r = -EINVAL; |
1688 | if (arg) | |
1689 | goto out; | |
b6c7a5dc | 1690 | r = kvm_arch_vcpu_ioctl_run(vcpu, vcpu->run); |
64be5007 | 1691 | trace_kvm_userspace_exit(vcpu->run->exit_reason, r); |
6aa8b732 | 1692 | break; |
6aa8b732 | 1693 | case KVM_GET_REGS: { |
3e4bb3ac | 1694 | struct kvm_regs *kvm_regs; |
6aa8b732 | 1695 | |
3e4bb3ac XZ |
1696 | r = -ENOMEM; |
1697 | kvm_regs = kzalloc(sizeof(struct kvm_regs), GFP_KERNEL); | |
1698 | if (!kvm_regs) | |
6aa8b732 | 1699 | goto out; |
3e4bb3ac XZ |
1700 | r = kvm_arch_vcpu_ioctl_get_regs(vcpu, kvm_regs); |
1701 | if (r) | |
1702 | goto out_free1; | |
6aa8b732 | 1703 | r = -EFAULT; |
3e4bb3ac XZ |
1704 | if (copy_to_user(argp, kvm_regs, sizeof(struct kvm_regs))) |
1705 | goto out_free1; | |
6aa8b732 | 1706 | r = 0; |
3e4bb3ac XZ |
1707 | out_free1: |
1708 | kfree(kvm_regs); | |
6aa8b732 AK |
1709 | break; |
1710 | } | |
1711 | case KVM_SET_REGS: { | |
3e4bb3ac | 1712 | struct kvm_regs *kvm_regs; |
6aa8b732 | 1713 | |
3e4bb3ac XZ |
1714 | r = -ENOMEM; |
1715 | kvm_regs = kzalloc(sizeof(struct kvm_regs), GFP_KERNEL); | |
1716 | if (!kvm_regs) | |
6aa8b732 | 1717 | goto out; |
3e4bb3ac XZ |
1718 | r = -EFAULT; |
1719 | if (copy_from_user(kvm_regs, argp, sizeof(struct kvm_regs))) | |
1720 | goto out_free2; | |
1721 | r = kvm_arch_vcpu_ioctl_set_regs(vcpu, kvm_regs); | |
6aa8b732 | 1722 | if (r) |
3e4bb3ac | 1723 | goto out_free2; |
6aa8b732 | 1724 | r = 0; |
3e4bb3ac XZ |
1725 | out_free2: |
1726 | kfree(kvm_regs); | |
6aa8b732 AK |
1727 | break; |
1728 | } | |
1729 | case KVM_GET_SREGS: { | |
fa3795a7 DH |
1730 | kvm_sregs = kzalloc(sizeof(struct kvm_sregs), GFP_KERNEL); |
1731 | r = -ENOMEM; | |
1732 | if (!kvm_sregs) | |
1733 | goto out; | |
1734 | r = kvm_arch_vcpu_ioctl_get_sregs(vcpu, kvm_sregs); | |
6aa8b732 AK |
1735 | if (r) |
1736 | goto out; | |
1737 | r = -EFAULT; | |
fa3795a7 | 1738 | if (copy_to_user(argp, kvm_sregs, sizeof(struct kvm_sregs))) |
6aa8b732 AK |
1739 | goto out; |
1740 | r = 0; | |
1741 | break; | |
1742 | } | |
1743 | case KVM_SET_SREGS: { | |
fa3795a7 DH |
1744 | kvm_sregs = kmalloc(sizeof(struct kvm_sregs), GFP_KERNEL); |
1745 | r = -ENOMEM; | |
1746 | if (!kvm_sregs) | |
1747 | goto out; | |
6aa8b732 | 1748 | r = -EFAULT; |
fa3795a7 | 1749 | if (copy_from_user(kvm_sregs, argp, sizeof(struct kvm_sregs))) |
6aa8b732 | 1750 | goto out; |
fa3795a7 | 1751 | r = kvm_arch_vcpu_ioctl_set_sregs(vcpu, kvm_sregs); |
6aa8b732 AK |
1752 | if (r) |
1753 | goto out; | |
1754 | r = 0; | |
1755 | break; | |
1756 | } | |
62d9f0db MT |
1757 | case KVM_GET_MP_STATE: { |
1758 | struct kvm_mp_state mp_state; | |
1759 | ||
1760 | r = kvm_arch_vcpu_ioctl_get_mpstate(vcpu, &mp_state); | |
1761 | if (r) | |
1762 | goto out; | |
1763 | r = -EFAULT; | |
1764 | if (copy_to_user(argp, &mp_state, sizeof mp_state)) | |
1765 | goto out; | |
1766 | r = 0; | |
1767 | break; | |
1768 | } | |
1769 | case KVM_SET_MP_STATE: { | |
1770 | struct kvm_mp_state mp_state; | |
1771 | ||
1772 | r = -EFAULT; | |
1773 | if (copy_from_user(&mp_state, argp, sizeof mp_state)) | |
1774 | goto out; | |
1775 | r = kvm_arch_vcpu_ioctl_set_mpstate(vcpu, &mp_state); | |
1776 | if (r) | |
1777 | goto out; | |
1778 | r = 0; | |
1779 | break; | |
1780 | } | |
6aa8b732 AK |
1781 | case KVM_TRANSLATE: { |
1782 | struct kvm_translation tr; | |
1783 | ||
1784 | r = -EFAULT; | |
2f366987 | 1785 | if (copy_from_user(&tr, argp, sizeof tr)) |
6aa8b732 | 1786 | goto out; |
8b006791 | 1787 | r = kvm_arch_vcpu_ioctl_translate(vcpu, &tr); |
6aa8b732 AK |
1788 | if (r) |
1789 | goto out; | |
1790 | r = -EFAULT; | |
2f366987 | 1791 | if (copy_to_user(argp, &tr, sizeof tr)) |
6aa8b732 AK |
1792 | goto out; |
1793 | r = 0; | |
1794 | break; | |
1795 | } | |
d0bfb940 JK |
1796 | case KVM_SET_GUEST_DEBUG: { |
1797 | struct kvm_guest_debug dbg; | |
6aa8b732 AK |
1798 | |
1799 | r = -EFAULT; | |
2f366987 | 1800 | if (copy_from_user(&dbg, argp, sizeof dbg)) |
6aa8b732 | 1801 | goto out; |
d0bfb940 | 1802 | r = kvm_arch_vcpu_ioctl_set_guest_debug(vcpu, &dbg); |
6aa8b732 AK |
1803 | if (r) |
1804 | goto out; | |
1805 | r = 0; | |
1806 | break; | |
1807 | } | |
1961d276 AK |
1808 | case KVM_SET_SIGNAL_MASK: { |
1809 | struct kvm_signal_mask __user *sigmask_arg = argp; | |
1810 | struct kvm_signal_mask kvm_sigmask; | |
1811 | sigset_t sigset, *p; | |
1812 | ||
1813 | p = NULL; | |
1814 | if (argp) { | |
1815 | r = -EFAULT; | |
1816 | if (copy_from_user(&kvm_sigmask, argp, | |
1817 | sizeof kvm_sigmask)) | |
1818 | goto out; | |
1819 | r = -EINVAL; | |
1820 | if (kvm_sigmask.len != sizeof sigset) | |
1821 | goto out; | |
1822 | r = -EFAULT; | |
1823 | if (copy_from_user(&sigset, sigmask_arg->sigset, | |
1824 | sizeof sigset)) | |
1825 | goto out; | |
1826 | p = &sigset; | |
1827 | } | |
376d41ff | 1828 | r = kvm_vcpu_ioctl_set_sigmask(vcpu, p); |
1961d276 AK |
1829 | break; |
1830 | } | |
b8836737 | 1831 | case KVM_GET_FPU: { |
fa3795a7 DH |
1832 | fpu = kzalloc(sizeof(struct kvm_fpu), GFP_KERNEL); |
1833 | r = -ENOMEM; | |
1834 | if (!fpu) | |
1835 | goto out; | |
1836 | r = kvm_arch_vcpu_ioctl_get_fpu(vcpu, fpu); | |
b8836737 AK |
1837 | if (r) |
1838 | goto out; | |
1839 | r = -EFAULT; | |
fa3795a7 | 1840 | if (copy_to_user(argp, fpu, sizeof(struct kvm_fpu))) |
b8836737 AK |
1841 | goto out; |
1842 | r = 0; | |
1843 | break; | |
1844 | } | |
1845 | case KVM_SET_FPU: { | |
fa3795a7 DH |
1846 | fpu = kmalloc(sizeof(struct kvm_fpu), GFP_KERNEL); |
1847 | r = -ENOMEM; | |
1848 | if (!fpu) | |
1849 | goto out; | |
b8836737 | 1850 | r = -EFAULT; |
fa3795a7 | 1851 | if (copy_from_user(fpu, argp, sizeof(struct kvm_fpu))) |
b8836737 | 1852 | goto out; |
fa3795a7 | 1853 | r = kvm_arch_vcpu_ioctl_set_fpu(vcpu, fpu); |
b8836737 AK |
1854 | if (r) |
1855 | goto out; | |
1856 | r = 0; | |
1857 | break; | |
1858 | } | |
bccf2150 | 1859 | default: |
313a3dc7 | 1860 | r = kvm_arch_vcpu_ioctl(filp, ioctl, arg); |
bccf2150 AK |
1861 | } |
1862 | out: | |
2122ff5e | 1863 | vcpu_put(vcpu); |
fa3795a7 DH |
1864 | kfree(fpu); |
1865 | kfree(kvm_sregs); | |
bccf2150 AK |
1866 | return r; |
1867 | } | |
1868 | ||
1869 | static long kvm_vm_ioctl(struct file *filp, | |
1870 | unsigned int ioctl, unsigned long arg) | |
1871 | { | |
1872 | struct kvm *kvm = filp->private_data; | |
1873 | void __user *argp = (void __user *)arg; | |
1fe779f8 | 1874 | int r; |
bccf2150 | 1875 | |
6d4e4c4f AK |
1876 | if (kvm->mm != current->mm) |
1877 | return -EIO; | |
bccf2150 AK |
1878 | switch (ioctl) { |
1879 | case KVM_CREATE_VCPU: | |
1880 | r = kvm_vm_ioctl_create_vcpu(kvm, arg); | |
1881 | if (r < 0) | |
1882 | goto out; | |
1883 | break; | |
6fc138d2 IE |
1884 | case KVM_SET_USER_MEMORY_REGION: { |
1885 | struct kvm_userspace_memory_region kvm_userspace_mem; | |
1886 | ||
1887 | r = -EFAULT; | |
1888 | if (copy_from_user(&kvm_userspace_mem, argp, | |
1889 | sizeof kvm_userspace_mem)) | |
1890 | goto out; | |
1891 | ||
1892 | r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_userspace_mem, 1); | |
6aa8b732 AK |
1893 | if (r) |
1894 | goto out; | |
1895 | break; | |
1896 | } | |
1897 | case KVM_GET_DIRTY_LOG: { | |
1898 | struct kvm_dirty_log log; | |
1899 | ||
1900 | r = -EFAULT; | |
2f366987 | 1901 | if (copy_from_user(&log, argp, sizeof log)) |
6aa8b732 | 1902 | goto out; |
2c6f5df9 | 1903 | r = kvm_vm_ioctl_get_dirty_log(kvm, &log); |
6aa8b732 AK |
1904 | if (r) |
1905 | goto out; | |
1906 | break; | |
1907 | } | |
5f94c174 LV |
1908 | #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET |
1909 | case KVM_REGISTER_COALESCED_MMIO: { | |
1910 | struct kvm_coalesced_mmio_zone zone; | |
1911 | r = -EFAULT; | |
1912 | if (copy_from_user(&zone, argp, sizeof zone)) | |
1913 | goto out; | |
5f94c174 LV |
1914 | r = kvm_vm_ioctl_register_coalesced_mmio(kvm, &zone); |
1915 | if (r) | |
1916 | goto out; | |
1917 | r = 0; | |
1918 | break; | |
1919 | } | |
1920 | case KVM_UNREGISTER_COALESCED_MMIO: { | |
1921 | struct kvm_coalesced_mmio_zone zone; | |
1922 | r = -EFAULT; | |
1923 | if (copy_from_user(&zone, argp, sizeof zone)) | |
1924 | goto out; | |
5f94c174 LV |
1925 | r = kvm_vm_ioctl_unregister_coalesced_mmio(kvm, &zone); |
1926 | if (r) | |
1927 | goto out; | |
1928 | r = 0; | |
1929 | break; | |
1930 | } | |
1931 | #endif | |
721eecbf GH |
1932 | case KVM_IRQFD: { |
1933 | struct kvm_irqfd data; | |
1934 | ||
1935 | r = -EFAULT; | |
1936 | if (copy_from_user(&data, argp, sizeof data)) | |
1937 | goto out; | |
1938 | r = kvm_irqfd(kvm, data.fd, data.gsi, data.flags); | |
1939 | break; | |
1940 | } | |
d34e6b17 GH |
1941 | case KVM_IOEVENTFD: { |
1942 | struct kvm_ioeventfd data; | |
1943 | ||
1944 | r = -EFAULT; | |
1945 | if (copy_from_user(&data, argp, sizeof data)) | |
1946 | goto out; | |
1947 | r = kvm_ioeventfd(kvm, &data); | |
1948 | break; | |
1949 | } | |
73880c80 GN |
1950 | #ifdef CONFIG_KVM_APIC_ARCHITECTURE |
1951 | case KVM_SET_BOOT_CPU_ID: | |
1952 | r = 0; | |
894a9c55 | 1953 | mutex_lock(&kvm->lock); |
73880c80 GN |
1954 | if (atomic_read(&kvm->online_vcpus) != 0) |
1955 | r = -EBUSY; | |
1956 | else | |
1957 | kvm->bsp_vcpu_id = arg; | |
894a9c55 | 1958 | mutex_unlock(&kvm->lock); |
73880c80 GN |
1959 | break; |
1960 | #endif | |
f17abe9a | 1961 | default: |
1fe779f8 | 1962 | r = kvm_arch_vm_ioctl(filp, ioctl, arg); |
bfd99ff5 AK |
1963 | if (r == -ENOTTY) |
1964 | r = kvm_vm_ioctl_assigned_device(kvm, ioctl, arg); | |
f17abe9a AK |
1965 | } |
1966 | out: | |
1967 | return r; | |
1968 | } | |
1969 | ||
6ff5894c AB |
1970 | #ifdef CONFIG_COMPAT |
1971 | struct compat_kvm_dirty_log { | |
1972 | __u32 slot; | |
1973 | __u32 padding1; | |
1974 | union { | |
1975 | compat_uptr_t dirty_bitmap; /* one bit per page */ | |
1976 | __u64 padding2; | |
1977 | }; | |
1978 | }; | |
1979 | ||
1980 | static long kvm_vm_compat_ioctl(struct file *filp, | |
1981 | unsigned int ioctl, unsigned long arg) | |
1982 | { | |
1983 | struct kvm *kvm = filp->private_data; | |
1984 | int r; | |
1985 | ||
1986 | if (kvm->mm != current->mm) | |
1987 | return -EIO; | |
1988 | switch (ioctl) { | |
1989 | case KVM_GET_DIRTY_LOG: { | |
1990 | struct compat_kvm_dirty_log compat_log; | |
1991 | struct kvm_dirty_log log; | |
1992 | ||
1993 | r = -EFAULT; | |
1994 | if (copy_from_user(&compat_log, (void __user *)arg, | |
1995 | sizeof(compat_log))) | |
1996 | goto out; | |
1997 | log.slot = compat_log.slot; | |
1998 | log.padding1 = compat_log.padding1; | |
1999 | log.padding2 = compat_log.padding2; | |
2000 | log.dirty_bitmap = compat_ptr(compat_log.dirty_bitmap); | |
2001 | ||
2002 | r = kvm_vm_ioctl_get_dirty_log(kvm, &log); | |
2003 | if (r) | |
2004 | goto out; | |
2005 | break; | |
2006 | } | |
2007 | default: | |
2008 | r = kvm_vm_ioctl(filp, ioctl, arg); | |
2009 | } | |
2010 | ||
2011 | out: | |
2012 | return r; | |
2013 | } | |
2014 | #endif | |
2015 | ||
e4a533a4 | 2016 | static int kvm_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf) |
f17abe9a | 2017 | { |
777b3f49 MT |
2018 | struct page *page[1]; |
2019 | unsigned long addr; | |
2020 | int npages; | |
2021 | gfn_t gfn = vmf->pgoff; | |
f17abe9a | 2022 | struct kvm *kvm = vma->vm_file->private_data; |
f17abe9a | 2023 | |
777b3f49 MT |
2024 | addr = gfn_to_hva(kvm, gfn); |
2025 | if (kvm_is_error_hva(addr)) | |
e4a533a4 | 2026 | return VM_FAULT_SIGBUS; |
777b3f49 MT |
2027 | |
2028 | npages = get_user_pages(current, current->mm, addr, 1, 1, 0, page, | |
2029 | NULL); | |
2030 | if (unlikely(npages != 1)) | |
e4a533a4 | 2031 | return VM_FAULT_SIGBUS; |
777b3f49 MT |
2032 | |
2033 | vmf->page = page[0]; | |
e4a533a4 | 2034 | return 0; |
f17abe9a AK |
2035 | } |
2036 | ||
f0f37e2f | 2037 | static const struct vm_operations_struct kvm_vm_vm_ops = { |
e4a533a4 | 2038 | .fault = kvm_vm_fault, |
f17abe9a AK |
2039 | }; |
2040 | ||
2041 | static int kvm_vm_mmap(struct file *file, struct vm_area_struct *vma) | |
2042 | { | |
2043 | vma->vm_ops = &kvm_vm_vm_ops; | |
2044 | return 0; | |
2045 | } | |
2046 | ||
3d3aab1b | 2047 | static struct file_operations kvm_vm_fops = { |
f17abe9a AK |
2048 | .release = kvm_vm_release, |
2049 | .unlocked_ioctl = kvm_vm_ioctl, | |
6ff5894c AB |
2050 | #ifdef CONFIG_COMPAT |
2051 | .compat_ioctl = kvm_vm_compat_ioctl, | |
2052 | #endif | |
f17abe9a | 2053 | .mmap = kvm_vm_mmap, |
6038f373 | 2054 | .llseek = noop_llseek, |
f17abe9a AK |
2055 | }; |
2056 | ||
2057 | static int kvm_dev_ioctl_create_vm(void) | |
2058 | { | |
aac87636 | 2059 | int r; |
f17abe9a AK |
2060 | struct kvm *kvm; |
2061 | ||
f17abe9a | 2062 | kvm = kvm_create_vm(); |
d6d28168 AK |
2063 | if (IS_ERR(kvm)) |
2064 | return PTR_ERR(kvm); | |
6ce5a090 TY |
2065 | #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET |
2066 | r = kvm_coalesced_mmio_init(kvm); | |
2067 | if (r < 0) { | |
2068 | kvm_put_kvm(kvm); | |
2069 | return r; | |
2070 | } | |
2071 | #endif | |
aac87636 HC |
2072 | r = anon_inode_getfd("kvm-vm", &kvm_vm_fops, kvm, O_RDWR); |
2073 | if (r < 0) | |
66c0b394 | 2074 | kvm_put_kvm(kvm); |
f17abe9a | 2075 | |
aac87636 | 2076 | return r; |
f17abe9a AK |
2077 | } |
2078 | ||
1a811b61 AK |
2079 | static long kvm_dev_ioctl_check_extension_generic(long arg) |
2080 | { | |
2081 | switch (arg) { | |
ca9edaee | 2082 | case KVM_CAP_USER_MEMORY: |
1a811b61 | 2083 | case KVM_CAP_DESTROY_MEMORY_REGION_WORKS: |
4cd481f6 | 2084 | case KVM_CAP_JOIN_MEMORY_REGIONS_WORKS: |
73880c80 GN |
2085 | #ifdef CONFIG_KVM_APIC_ARCHITECTURE |
2086 | case KVM_CAP_SET_BOOT_CPU_ID: | |
2087 | #endif | |
a9c7399d | 2088 | case KVM_CAP_INTERNAL_ERROR_DATA: |
1a811b61 | 2089 | return 1; |
399ec807 AK |
2090 | #ifdef CONFIG_HAVE_KVM_IRQCHIP |
2091 | case KVM_CAP_IRQ_ROUTING: | |
36463146 | 2092 | return KVM_MAX_IRQ_ROUTES; |
399ec807 | 2093 | #endif |
1a811b61 AK |
2094 | default: |
2095 | break; | |
2096 | } | |
2097 | return kvm_dev_ioctl_check_extension(arg); | |
2098 | } | |
2099 | ||
f17abe9a AK |
2100 | static long kvm_dev_ioctl(struct file *filp, |
2101 | unsigned int ioctl, unsigned long arg) | |
2102 | { | |
07c45a36 | 2103 | long r = -EINVAL; |
f17abe9a AK |
2104 | |
2105 | switch (ioctl) { | |
2106 | case KVM_GET_API_VERSION: | |
f0fe5108 AK |
2107 | r = -EINVAL; |
2108 | if (arg) | |
2109 | goto out; | |
f17abe9a AK |
2110 | r = KVM_API_VERSION; |
2111 | break; | |
2112 | case KVM_CREATE_VM: | |
f0fe5108 AK |
2113 | r = -EINVAL; |
2114 | if (arg) | |
2115 | goto out; | |
f17abe9a AK |
2116 | r = kvm_dev_ioctl_create_vm(); |
2117 | break; | |
018d00d2 | 2118 | case KVM_CHECK_EXTENSION: |
1a811b61 | 2119 | r = kvm_dev_ioctl_check_extension_generic(arg); |
5d308f45 | 2120 | break; |
07c45a36 AK |
2121 | case KVM_GET_VCPU_MMAP_SIZE: |
2122 | r = -EINVAL; | |
2123 | if (arg) | |
2124 | goto out; | |
adb1ff46 AK |
2125 | r = PAGE_SIZE; /* struct kvm_run */ |
2126 | #ifdef CONFIG_X86 | |
2127 | r += PAGE_SIZE; /* pio data page */ | |
5f94c174 LV |
2128 | #endif |
2129 | #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET | |
2130 | r += PAGE_SIZE; /* coalesced mmio ring page */ | |
adb1ff46 | 2131 | #endif |
07c45a36 | 2132 | break; |
d4c9ff2d FEL |
2133 | case KVM_TRACE_ENABLE: |
2134 | case KVM_TRACE_PAUSE: | |
2135 | case KVM_TRACE_DISABLE: | |
2023a29c | 2136 | r = -EOPNOTSUPP; |
d4c9ff2d | 2137 | break; |
6aa8b732 | 2138 | default: |
043405e1 | 2139 | return kvm_arch_dev_ioctl(filp, ioctl, arg); |
6aa8b732 AK |
2140 | } |
2141 | out: | |
2142 | return r; | |
2143 | } | |
2144 | ||
6aa8b732 | 2145 | static struct file_operations kvm_chardev_ops = { |
6aa8b732 AK |
2146 | .unlocked_ioctl = kvm_dev_ioctl, |
2147 | .compat_ioctl = kvm_dev_ioctl, | |
6038f373 | 2148 | .llseek = noop_llseek, |
6aa8b732 AK |
2149 | }; |
2150 | ||
2151 | static struct miscdevice kvm_dev = { | |
bbe4432e | 2152 | KVM_MINOR, |
6aa8b732 AK |
2153 | "kvm", |
2154 | &kvm_chardev_ops, | |
2155 | }; | |
2156 | ||
75b7127c | 2157 | static void hardware_enable_nolock(void *junk) |
1b6c0168 AK |
2158 | { |
2159 | int cpu = raw_smp_processor_id(); | |
10474ae8 | 2160 | int r; |
1b6c0168 | 2161 | |
7f59f492 | 2162 | if (cpumask_test_cpu(cpu, cpus_hardware_enabled)) |
1b6c0168 | 2163 | return; |
10474ae8 | 2164 | |
7f59f492 | 2165 | cpumask_set_cpu(cpu, cpus_hardware_enabled); |
10474ae8 AG |
2166 | |
2167 | r = kvm_arch_hardware_enable(NULL); | |
2168 | ||
2169 | if (r) { | |
2170 | cpumask_clear_cpu(cpu, cpus_hardware_enabled); | |
2171 | atomic_inc(&hardware_enable_failed); | |
2172 | printk(KERN_INFO "kvm: enabling virtualization on " | |
2173 | "CPU%d failed\n", cpu); | |
2174 | } | |
1b6c0168 AK |
2175 | } |
2176 | ||
75b7127c TY |
2177 | static void hardware_enable(void *junk) |
2178 | { | |
e935b837 | 2179 | raw_spin_lock(&kvm_lock); |
75b7127c | 2180 | hardware_enable_nolock(junk); |
e935b837 | 2181 | raw_spin_unlock(&kvm_lock); |
75b7127c TY |
2182 | } |
2183 | ||
2184 | static void hardware_disable_nolock(void *junk) | |
1b6c0168 AK |
2185 | { |
2186 | int cpu = raw_smp_processor_id(); | |
2187 | ||
7f59f492 | 2188 | if (!cpumask_test_cpu(cpu, cpus_hardware_enabled)) |
1b6c0168 | 2189 | return; |
7f59f492 | 2190 | cpumask_clear_cpu(cpu, cpus_hardware_enabled); |
e9b11c17 | 2191 | kvm_arch_hardware_disable(NULL); |
1b6c0168 AK |
2192 | } |
2193 | ||
75b7127c TY |
2194 | static void hardware_disable(void *junk) |
2195 | { | |
e935b837 | 2196 | raw_spin_lock(&kvm_lock); |
75b7127c | 2197 | hardware_disable_nolock(junk); |
e935b837 | 2198 | raw_spin_unlock(&kvm_lock); |
75b7127c TY |
2199 | } |
2200 | ||
10474ae8 AG |
2201 | static void hardware_disable_all_nolock(void) |
2202 | { | |
2203 | BUG_ON(!kvm_usage_count); | |
2204 | ||
2205 | kvm_usage_count--; | |
2206 | if (!kvm_usage_count) | |
75b7127c | 2207 | on_each_cpu(hardware_disable_nolock, NULL, 1); |
10474ae8 AG |
2208 | } |
2209 | ||
2210 | static void hardware_disable_all(void) | |
2211 | { | |
e935b837 | 2212 | raw_spin_lock(&kvm_lock); |
10474ae8 | 2213 | hardware_disable_all_nolock(); |
e935b837 | 2214 | raw_spin_unlock(&kvm_lock); |
10474ae8 AG |
2215 | } |
2216 | ||
2217 | static int hardware_enable_all(void) | |
2218 | { | |
2219 | int r = 0; | |
2220 | ||
e935b837 | 2221 | raw_spin_lock(&kvm_lock); |
10474ae8 AG |
2222 | |
2223 | kvm_usage_count++; | |
2224 | if (kvm_usage_count == 1) { | |
2225 | atomic_set(&hardware_enable_failed, 0); | |
75b7127c | 2226 | on_each_cpu(hardware_enable_nolock, NULL, 1); |
10474ae8 AG |
2227 | |
2228 | if (atomic_read(&hardware_enable_failed)) { | |
2229 | hardware_disable_all_nolock(); | |
2230 | r = -EBUSY; | |
2231 | } | |
2232 | } | |
2233 | ||
e935b837 | 2234 | raw_spin_unlock(&kvm_lock); |
10474ae8 AG |
2235 | |
2236 | return r; | |
2237 | } | |
2238 | ||
774c47f1 AK |
2239 | static int kvm_cpu_hotplug(struct notifier_block *notifier, unsigned long val, |
2240 | void *v) | |
2241 | { | |
2242 | int cpu = (long)v; | |
2243 | ||
10474ae8 AG |
2244 | if (!kvm_usage_count) |
2245 | return NOTIFY_OK; | |
2246 | ||
1a6f4d7f | 2247 | val &= ~CPU_TASKS_FROZEN; |
774c47f1 | 2248 | switch (val) { |
cec9ad27 | 2249 | case CPU_DYING: |
6ec8a856 AK |
2250 | printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n", |
2251 | cpu); | |
2252 | hardware_disable(NULL); | |
2253 | break; | |
da908f2f | 2254 | case CPU_STARTING: |
43934a38 JK |
2255 | printk(KERN_INFO "kvm: enabling virtualization on CPU%d\n", |
2256 | cpu); | |
da908f2f | 2257 | hardware_enable(NULL); |
774c47f1 AK |
2258 | break; |
2259 | } | |
2260 | return NOTIFY_OK; | |
2261 | } | |
2262 | ||
4ecac3fd | 2263 | |
b7c4145b | 2264 | asmlinkage void kvm_spurious_fault(void) |
4ecac3fd | 2265 | { |
4ecac3fd AK |
2266 | /* Fault while not rebooting. We want the trace. */ |
2267 | BUG(); | |
2268 | } | |
b7c4145b | 2269 | EXPORT_SYMBOL_GPL(kvm_spurious_fault); |
4ecac3fd | 2270 | |
9a2b85c6 | 2271 | static int kvm_reboot(struct notifier_block *notifier, unsigned long val, |
d77c26fc | 2272 | void *v) |
9a2b85c6 | 2273 | { |
8e1c1815 SY |
2274 | /* |
2275 | * Some (well, at least mine) BIOSes hang on reboot if | |
2276 | * in vmx root mode. | |
2277 | * | |
2278 | * And Intel TXT required VMX off for all cpu when system shutdown. | |
2279 | */ | |
2280 | printk(KERN_INFO "kvm: exiting hardware virtualization\n"); | |
2281 | kvm_rebooting = true; | |
75b7127c | 2282 | on_each_cpu(hardware_disable_nolock, NULL, 1); |
9a2b85c6 RR |
2283 | return NOTIFY_OK; |
2284 | } | |
2285 | ||
2286 | static struct notifier_block kvm_reboot_notifier = { | |
2287 | .notifier_call = kvm_reboot, | |
2288 | .priority = 0, | |
2289 | }; | |
2290 | ||
e93f8a0f | 2291 | static void kvm_io_bus_destroy(struct kvm_io_bus *bus) |
2eeb2e94 GH |
2292 | { |
2293 | int i; | |
2294 | ||
2295 | for (i = 0; i < bus->dev_count; i++) { | |
2296 | struct kvm_io_device *pos = bus->devs[i]; | |
2297 | ||
2298 | kvm_iodevice_destructor(pos); | |
2299 | } | |
e93f8a0f | 2300 | kfree(bus); |
2eeb2e94 GH |
2301 | } |
2302 | ||
bda9020e | 2303 | /* kvm_io_bus_write - called under kvm->slots_lock */ |
e93f8a0f | 2304 | int kvm_io_bus_write(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr, |
bda9020e | 2305 | int len, const void *val) |
2eeb2e94 GH |
2306 | { |
2307 | int i; | |
90d83dc3 LJ |
2308 | struct kvm_io_bus *bus; |
2309 | ||
2310 | bus = srcu_dereference(kvm->buses[bus_idx], &kvm->srcu); | |
bda9020e MT |
2311 | for (i = 0; i < bus->dev_count; i++) |
2312 | if (!kvm_iodevice_write(bus->devs[i], addr, len, val)) | |
2313 | return 0; | |
2314 | return -EOPNOTSUPP; | |
2315 | } | |
2eeb2e94 | 2316 | |
bda9020e | 2317 | /* kvm_io_bus_read - called under kvm->slots_lock */ |
e93f8a0f MT |
2318 | int kvm_io_bus_read(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr, |
2319 | int len, void *val) | |
bda9020e MT |
2320 | { |
2321 | int i; | |
90d83dc3 | 2322 | struct kvm_io_bus *bus; |
e93f8a0f | 2323 | |
90d83dc3 | 2324 | bus = srcu_dereference(kvm->buses[bus_idx], &kvm->srcu); |
bda9020e MT |
2325 | for (i = 0; i < bus->dev_count; i++) |
2326 | if (!kvm_iodevice_read(bus->devs[i], addr, len, val)) | |
2327 | return 0; | |
2328 | return -EOPNOTSUPP; | |
2eeb2e94 GH |
2329 | } |
2330 | ||
79fac95e | 2331 | /* Caller must hold slots_lock. */ |
e93f8a0f MT |
2332 | int kvm_io_bus_register_dev(struct kvm *kvm, enum kvm_bus bus_idx, |
2333 | struct kvm_io_device *dev) | |
6c474694 | 2334 | { |
e93f8a0f | 2335 | struct kvm_io_bus *new_bus, *bus; |
090b7aff | 2336 | |
e93f8a0f | 2337 | bus = kvm->buses[bus_idx]; |
090b7aff GH |
2338 | if (bus->dev_count > NR_IOBUS_DEVS-1) |
2339 | return -ENOSPC; | |
2eeb2e94 | 2340 | |
e93f8a0f MT |
2341 | new_bus = kzalloc(sizeof(struct kvm_io_bus), GFP_KERNEL); |
2342 | if (!new_bus) | |
2343 | return -ENOMEM; | |
2344 | memcpy(new_bus, bus, sizeof(struct kvm_io_bus)); | |
2345 | new_bus->devs[new_bus->dev_count++] = dev; | |
2346 | rcu_assign_pointer(kvm->buses[bus_idx], new_bus); | |
2347 | synchronize_srcu_expedited(&kvm->srcu); | |
2348 | kfree(bus); | |
090b7aff GH |
2349 | |
2350 | return 0; | |
2351 | } | |
2352 | ||
79fac95e | 2353 | /* Caller must hold slots_lock. */ |
e93f8a0f MT |
2354 | int kvm_io_bus_unregister_dev(struct kvm *kvm, enum kvm_bus bus_idx, |
2355 | struct kvm_io_device *dev) | |
090b7aff | 2356 | { |
e93f8a0f MT |
2357 | int i, r; |
2358 | struct kvm_io_bus *new_bus, *bus; | |
090b7aff | 2359 | |
e93f8a0f MT |
2360 | new_bus = kzalloc(sizeof(struct kvm_io_bus), GFP_KERNEL); |
2361 | if (!new_bus) | |
2362 | return -ENOMEM; | |
090b7aff | 2363 | |
e93f8a0f MT |
2364 | bus = kvm->buses[bus_idx]; |
2365 | memcpy(new_bus, bus, sizeof(struct kvm_io_bus)); | |
2366 | ||
2367 | r = -ENOENT; | |
2368 | for (i = 0; i < new_bus->dev_count; i++) | |
2369 | if (new_bus->devs[i] == dev) { | |
2370 | r = 0; | |
2371 | new_bus->devs[i] = new_bus->devs[--new_bus->dev_count]; | |
090b7aff GH |
2372 | break; |
2373 | } | |
e93f8a0f MT |
2374 | |
2375 | if (r) { | |
2376 | kfree(new_bus); | |
2377 | return r; | |
2378 | } | |
2379 | ||
2380 | rcu_assign_pointer(kvm->buses[bus_idx], new_bus); | |
2381 | synchronize_srcu_expedited(&kvm->srcu); | |
2382 | kfree(bus); | |
2383 | return r; | |
2eeb2e94 GH |
2384 | } |
2385 | ||
774c47f1 AK |
2386 | static struct notifier_block kvm_cpu_notifier = { |
2387 | .notifier_call = kvm_cpu_hotplug, | |
774c47f1 AK |
2388 | }; |
2389 | ||
8b88b099 | 2390 | static int vm_stat_get(void *_offset, u64 *val) |
ba1389b7 AK |
2391 | { |
2392 | unsigned offset = (long)_offset; | |
ba1389b7 AK |
2393 | struct kvm *kvm; |
2394 | ||
8b88b099 | 2395 | *val = 0; |
e935b837 | 2396 | raw_spin_lock(&kvm_lock); |
ba1389b7 | 2397 | list_for_each_entry(kvm, &vm_list, vm_list) |
8b88b099 | 2398 | *val += *(u32 *)((void *)kvm + offset); |
e935b837 | 2399 | raw_spin_unlock(&kvm_lock); |
8b88b099 | 2400 | return 0; |
ba1389b7 AK |
2401 | } |
2402 | ||
2403 | DEFINE_SIMPLE_ATTRIBUTE(vm_stat_fops, vm_stat_get, NULL, "%llu\n"); | |
2404 | ||
8b88b099 | 2405 | static int vcpu_stat_get(void *_offset, u64 *val) |
1165f5fe AK |
2406 | { |
2407 | unsigned offset = (long)_offset; | |
1165f5fe AK |
2408 | struct kvm *kvm; |
2409 | struct kvm_vcpu *vcpu; | |
2410 | int i; | |
2411 | ||
8b88b099 | 2412 | *val = 0; |
e935b837 | 2413 | raw_spin_lock(&kvm_lock); |
1165f5fe | 2414 | list_for_each_entry(kvm, &vm_list, vm_list) |
988a2cae GN |
2415 | kvm_for_each_vcpu(i, vcpu, kvm) |
2416 | *val += *(u32 *)((void *)vcpu + offset); | |
2417 | ||
e935b837 | 2418 | raw_spin_unlock(&kvm_lock); |
8b88b099 | 2419 | return 0; |
1165f5fe AK |
2420 | } |
2421 | ||
ba1389b7 AK |
2422 | DEFINE_SIMPLE_ATTRIBUTE(vcpu_stat_fops, vcpu_stat_get, NULL, "%llu\n"); |
2423 | ||
828c0950 | 2424 | static const struct file_operations *stat_fops[] = { |
ba1389b7 AK |
2425 | [KVM_STAT_VCPU] = &vcpu_stat_fops, |
2426 | [KVM_STAT_VM] = &vm_stat_fops, | |
2427 | }; | |
1165f5fe | 2428 | |
a16b043c | 2429 | static void kvm_init_debug(void) |
6aa8b732 AK |
2430 | { |
2431 | struct kvm_stats_debugfs_item *p; | |
2432 | ||
76f7c879 | 2433 | kvm_debugfs_dir = debugfs_create_dir("kvm", NULL); |
6aa8b732 | 2434 | for (p = debugfs_entries; p->name; ++p) |
76f7c879 | 2435 | p->dentry = debugfs_create_file(p->name, 0444, kvm_debugfs_dir, |
1165f5fe | 2436 | (void *)(long)p->offset, |
ba1389b7 | 2437 | stat_fops[p->kind]); |
6aa8b732 AK |
2438 | } |
2439 | ||
2440 | static void kvm_exit_debug(void) | |
2441 | { | |
2442 | struct kvm_stats_debugfs_item *p; | |
2443 | ||
2444 | for (p = debugfs_entries; p->name; ++p) | |
2445 | debugfs_remove(p->dentry); | |
76f7c879 | 2446 | debugfs_remove(kvm_debugfs_dir); |
6aa8b732 AK |
2447 | } |
2448 | ||
fb3600cc | 2449 | static int kvm_suspend(void) |
59ae6c6b | 2450 | { |
10474ae8 | 2451 | if (kvm_usage_count) |
75b7127c | 2452 | hardware_disable_nolock(NULL); |
59ae6c6b AK |
2453 | return 0; |
2454 | } | |
2455 | ||
fb3600cc | 2456 | static void kvm_resume(void) |
59ae6c6b | 2457 | { |
ca84d1a2 | 2458 | if (kvm_usage_count) { |
e935b837 | 2459 | WARN_ON(raw_spin_is_locked(&kvm_lock)); |
75b7127c | 2460 | hardware_enable_nolock(NULL); |
ca84d1a2 | 2461 | } |
59ae6c6b AK |
2462 | } |
2463 | ||
fb3600cc | 2464 | static struct syscore_ops kvm_syscore_ops = { |
59ae6c6b AK |
2465 | .suspend = kvm_suspend, |
2466 | .resume = kvm_resume, | |
2467 | }; | |
2468 | ||
cea7bb21 | 2469 | struct page *bad_page; |
35149e21 | 2470 | pfn_t bad_pfn; |
6aa8b732 | 2471 | |
15ad7146 AK |
2472 | static inline |
2473 | struct kvm_vcpu *preempt_notifier_to_vcpu(struct preempt_notifier *pn) | |
2474 | { | |
2475 | return container_of(pn, struct kvm_vcpu, preempt_notifier); | |
2476 | } | |
2477 | ||
2478 | static void kvm_sched_in(struct preempt_notifier *pn, int cpu) | |
2479 | { | |
2480 | struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn); | |
2481 | ||
e9b11c17 | 2482 | kvm_arch_vcpu_load(vcpu, cpu); |
15ad7146 AK |
2483 | } |
2484 | ||
2485 | static void kvm_sched_out(struct preempt_notifier *pn, | |
2486 | struct task_struct *next) | |
2487 | { | |
2488 | struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn); | |
2489 | ||
e9b11c17 | 2490 | kvm_arch_vcpu_put(vcpu); |
15ad7146 AK |
2491 | } |
2492 | ||
0ee75bea | 2493 | int kvm_init(void *opaque, unsigned vcpu_size, unsigned vcpu_align, |
c16f862d | 2494 | struct module *module) |
6aa8b732 AK |
2495 | { |
2496 | int r; | |
002c7f7c | 2497 | int cpu; |
6aa8b732 | 2498 | |
f8c16bba ZX |
2499 | r = kvm_arch_init(opaque); |
2500 | if (r) | |
d2308784 | 2501 | goto out_fail; |
cb498ea2 ZX |
2502 | |
2503 | bad_page = alloc_page(GFP_KERNEL | __GFP_ZERO); | |
2504 | ||
2505 | if (bad_page == NULL) { | |
2506 | r = -ENOMEM; | |
2507 | goto out; | |
2508 | } | |
2509 | ||
35149e21 AL |
2510 | bad_pfn = page_to_pfn(bad_page); |
2511 | ||
bf998156 HY |
2512 | hwpoison_page = alloc_page(GFP_KERNEL | __GFP_ZERO); |
2513 | ||
2514 | if (hwpoison_page == NULL) { | |
2515 | r = -ENOMEM; | |
2516 | goto out_free_0; | |
2517 | } | |
2518 | ||
2519 | hwpoison_pfn = page_to_pfn(hwpoison_page); | |
2520 | ||
edba23e5 GN |
2521 | fault_page = alloc_page(GFP_KERNEL | __GFP_ZERO); |
2522 | ||
2523 | if (fault_page == NULL) { | |
2524 | r = -ENOMEM; | |
2525 | goto out_free_0; | |
2526 | } | |
2527 | ||
2528 | fault_pfn = page_to_pfn(fault_page); | |
2529 | ||
8437a617 | 2530 | if (!zalloc_cpumask_var(&cpus_hardware_enabled, GFP_KERNEL)) { |
7f59f492 RR |
2531 | r = -ENOMEM; |
2532 | goto out_free_0; | |
2533 | } | |
2534 | ||
e9b11c17 | 2535 | r = kvm_arch_hardware_setup(); |
6aa8b732 | 2536 | if (r < 0) |
7f59f492 | 2537 | goto out_free_0a; |
6aa8b732 | 2538 | |
002c7f7c YS |
2539 | for_each_online_cpu(cpu) { |
2540 | smp_call_function_single(cpu, | |
e9b11c17 | 2541 | kvm_arch_check_processor_compat, |
8691e5a8 | 2542 | &r, 1); |
002c7f7c | 2543 | if (r < 0) |
d2308784 | 2544 | goto out_free_1; |
002c7f7c YS |
2545 | } |
2546 | ||
774c47f1 AK |
2547 | r = register_cpu_notifier(&kvm_cpu_notifier); |
2548 | if (r) | |
d2308784 | 2549 | goto out_free_2; |
6aa8b732 AK |
2550 | register_reboot_notifier(&kvm_reboot_notifier); |
2551 | ||
c16f862d | 2552 | /* A kmem cache lets us meet the alignment requirements of fx_save. */ |
0ee75bea AK |
2553 | if (!vcpu_align) |
2554 | vcpu_align = __alignof__(struct kvm_vcpu); | |
2555 | kvm_vcpu_cache = kmem_cache_create("kvm_vcpu", vcpu_size, vcpu_align, | |
56919c5c | 2556 | 0, NULL); |
c16f862d RR |
2557 | if (!kvm_vcpu_cache) { |
2558 | r = -ENOMEM; | |
fb3600cc | 2559 | goto out_free_3; |
c16f862d RR |
2560 | } |
2561 | ||
af585b92 GN |
2562 | r = kvm_async_pf_init(); |
2563 | if (r) | |
2564 | goto out_free; | |
2565 | ||
6aa8b732 | 2566 | kvm_chardev_ops.owner = module; |
3d3aab1b CB |
2567 | kvm_vm_fops.owner = module; |
2568 | kvm_vcpu_fops.owner = module; | |
6aa8b732 AK |
2569 | |
2570 | r = misc_register(&kvm_dev); | |
2571 | if (r) { | |
d77c26fc | 2572 | printk(KERN_ERR "kvm: misc device register failed\n"); |
af585b92 | 2573 | goto out_unreg; |
6aa8b732 AK |
2574 | } |
2575 | ||
fb3600cc RW |
2576 | register_syscore_ops(&kvm_syscore_ops); |
2577 | ||
15ad7146 AK |
2578 | kvm_preempt_ops.sched_in = kvm_sched_in; |
2579 | kvm_preempt_ops.sched_out = kvm_sched_out; | |
2580 | ||
0ea4ed8e DW |
2581 | kvm_init_debug(); |
2582 | ||
c7addb90 | 2583 | return 0; |
6aa8b732 | 2584 | |
af585b92 GN |
2585 | out_unreg: |
2586 | kvm_async_pf_deinit(); | |
6aa8b732 | 2587 | out_free: |
c16f862d | 2588 | kmem_cache_destroy(kvm_vcpu_cache); |
d2308784 | 2589 | out_free_3: |
6aa8b732 | 2590 | unregister_reboot_notifier(&kvm_reboot_notifier); |
774c47f1 | 2591 | unregister_cpu_notifier(&kvm_cpu_notifier); |
d2308784 | 2592 | out_free_2: |
d2308784 | 2593 | out_free_1: |
e9b11c17 | 2594 | kvm_arch_hardware_unsetup(); |
7f59f492 RR |
2595 | out_free_0a: |
2596 | free_cpumask_var(cpus_hardware_enabled); | |
d2308784 | 2597 | out_free_0: |
edba23e5 GN |
2598 | if (fault_page) |
2599 | __free_page(fault_page); | |
bf998156 HY |
2600 | if (hwpoison_page) |
2601 | __free_page(hwpoison_page); | |
d2308784 | 2602 | __free_page(bad_page); |
ca45aaae | 2603 | out: |
f8c16bba | 2604 | kvm_arch_exit(); |
d2308784 | 2605 | out_fail: |
6aa8b732 AK |
2606 | return r; |
2607 | } | |
cb498ea2 | 2608 | EXPORT_SYMBOL_GPL(kvm_init); |
6aa8b732 | 2609 | |
cb498ea2 | 2610 | void kvm_exit(void) |
6aa8b732 | 2611 | { |
0ea4ed8e | 2612 | kvm_exit_debug(); |
6aa8b732 | 2613 | misc_deregister(&kvm_dev); |
c16f862d | 2614 | kmem_cache_destroy(kvm_vcpu_cache); |
af585b92 | 2615 | kvm_async_pf_deinit(); |
fb3600cc | 2616 | unregister_syscore_ops(&kvm_syscore_ops); |
6aa8b732 | 2617 | unregister_reboot_notifier(&kvm_reboot_notifier); |
59ae6c6b | 2618 | unregister_cpu_notifier(&kvm_cpu_notifier); |
75b7127c | 2619 | on_each_cpu(hardware_disable_nolock, NULL, 1); |
e9b11c17 | 2620 | kvm_arch_hardware_unsetup(); |
f8c16bba | 2621 | kvm_arch_exit(); |
7f59f492 | 2622 | free_cpumask_var(cpus_hardware_enabled); |
bf998156 | 2623 | __free_page(hwpoison_page); |
cea7bb21 | 2624 | __free_page(bad_page); |
6aa8b732 | 2625 | } |
cb498ea2 | 2626 | EXPORT_SYMBOL_GPL(kvm_exit); |