Commit | Line | Data |
---|---|---|
6aa8b732 AK |
1 | /* |
2 | * Kernel-based Virtual Machine driver for Linux | |
3 | * | |
4 | * This module enables machines with Intel VT-x extensions to run virtual | |
5 | * machines without emulation or binary translation. | |
6 | * | |
7 | * Copyright (C) 2006 Qumranet, Inc. | |
9611c187 | 8 | * Copyright 2010 Red Hat, Inc. and/or its affiliates. |
6aa8b732 AK |
9 | * |
10 | * Authors: | |
11 | * Avi Kivity <avi@qumranet.com> | |
12 | * Yaniv Kamay <yaniv@qumranet.com> | |
13 | * | |
14 | * This work is licensed under the terms of the GNU GPL, version 2. See | |
15 | * the COPYING file in the top-level directory. | |
16 | * | |
17 | */ | |
18 | ||
e2174021 | 19 | #include "iodev.h" |
6aa8b732 | 20 | |
edf88417 | 21 | #include <linux/kvm_host.h> |
6aa8b732 AK |
22 | #include <linux/kvm.h> |
23 | #include <linux/module.h> | |
24 | #include <linux/errno.h> | |
6aa8b732 | 25 | #include <linux/percpu.h> |
6aa8b732 AK |
26 | #include <linux/mm.h> |
27 | #include <linux/miscdevice.h> | |
28 | #include <linux/vmalloc.h> | |
6aa8b732 | 29 | #include <linux/reboot.h> |
6aa8b732 AK |
30 | #include <linux/debugfs.h> |
31 | #include <linux/highmem.h> | |
32 | #include <linux/file.h> | |
fb3600cc | 33 | #include <linux/syscore_ops.h> |
774c47f1 | 34 | #include <linux/cpu.h> |
e8edc6e0 | 35 | #include <linux/sched.h> |
d9e368d6 AK |
36 | #include <linux/cpumask.h> |
37 | #include <linux/smp.h> | |
d6d28168 | 38 | #include <linux/anon_inodes.h> |
04d2cc77 | 39 | #include <linux/profile.h> |
7aa81cc0 | 40 | #include <linux/kvm_para.h> |
6fc138d2 | 41 | #include <linux/pagemap.h> |
8d4e1288 | 42 | #include <linux/mman.h> |
35149e21 | 43 | #include <linux/swap.h> |
e56d532f | 44 | #include <linux/bitops.h> |
547de29e | 45 | #include <linux/spinlock.h> |
6ff5894c | 46 | #include <linux/compat.h> |
bc6678a3 | 47 | #include <linux/srcu.h> |
8f0b1ab6 | 48 | #include <linux/hugetlb.h> |
5a0e3ad6 | 49 | #include <linux/slab.h> |
6aa8b732 | 50 | |
e495606d | 51 | #include <asm/processor.h> |
e495606d AK |
52 | #include <asm/io.h> |
53 | #include <asm/uaccess.h> | |
3e021bf5 | 54 | #include <asm/pgtable.h> |
6aa8b732 | 55 | |
5f94c174 | 56 | #include "coalesced_mmio.h" |
af585b92 | 57 | #include "async_pf.h" |
5f94c174 | 58 | |
229456fc MT |
59 | #define CREATE_TRACE_POINTS |
60 | #include <trace/events/kvm.h> | |
61 | ||
6aa8b732 AK |
62 | MODULE_AUTHOR("Qumranet"); |
63 | MODULE_LICENSE("GPL"); | |
64 | ||
fa40a821 MT |
65 | /* |
66 | * Ordering of locks: | |
67 | * | |
fae3a353 | 68 | * kvm->lock --> kvm->slots_lock --> kvm->irq_lock |
fa40a821 MT |
69 | */ |
70 | ||
e935b837 | 71 | DEFINE_RAW_SPINLOCK(kvm_lock); |
e9b11c17 | 72 | LIST_HEAD(vm_list); |
133de902 | 73 | |
7f59f492 | 74 | static cpumask_var_t cpus_hardware_enabled; |
10474ae8 AG |
75 | static int kvm_usage_count = 0; |
76 | static atomic_t hardware_enable_failed; | |
1b6c0168 | 77 | |
c16f862d RR |
78 | struct kmem_cache *kvm_vcpu_cache; |
79 | EXPORT_SYMBOL_GPL(kvm_vcpu_cache); | |
1165f5fe | 80 | |
15ad7146 AK |
81 | static __read_mostly struct preempt_ops kvm_preempt_ops; |
82 | ||
76f7c879 | 83 | struct dentry *kvm_debugfs_dir; |
6aa8b732 | 84 | |
bccf2150 AK |
85 | static long kvm_vcpu_ioctl(struct file *file, unsigned int ioctl, |
86 | unsigned long arg); | |
10474ae8 AG |
87 | static int hardware_enable_all(void); |
88 | static void hardware_disable_all(void); | |
bccf2150 | 89 | |
e93f8a0f MT |
90 | static void kvm_io_bus_destroy(struct kvm_io_bus *bus); |
91 | ||
b7c4145b AK |
92 | bool kvm_rebooting; |
93 | EXPORT_SYMBOL_GPL(kvm_rebooting); | |
4ecac3fd | 94 | |
54dee993 MT |
95 | static bool largepages_enabled = true; |
96 | ||
fa7bff8f GN |
97 | static struct page *hwpoison_page; |
98 | static pfn_t hwpoison_pfn; | |
bf998156 | 99 | |
edba23e5 GN |
100 | static struct page *fault_page; |
101 | static pfn_t fault_pfn; | |
102 | ||
c77fb9dc | 103 | inline int kvm_is_mmio_pfn(pfn_t pfn) |
cbff90a7 | 104 | { |
fc5659c8 | 105 | if (pfn_valid(pfn)) { |
22e5c47e | 106 | int reserved; |
936a5fe6 | 107 | struct page *tail = pfn_to_page(pfn); |
22e5c47e AA |
108 | struct page *head = compound_trans_head(tail); |
109 | reserved = PageReserved(head); | |
936a5fe6 | 110 | if (head != tail) { |
936a5fe6 | 111 | /* |
22e5c47e AA |
112 | * "head" is not a dangling pointer |
113 | * (compound_trans_head takes care of that) | |
114 | * but the hugepage may have been splitted | |
115 | * from under us (and we may not hold a | |
116 | * reference count on the head page so it can | |
117 | * be reused before we run PageReferenced), so | |
118 | * we've to check PageTail before returning | |
119 | * what we just read. | |
936a5fe6 | 120 | */ |
22e5c47e AA |
121 | smp_rmb(); |
122 | if (PageTail(tail)) | |
123 | return reserved; | |
936a5fe6 AA |
124 | } |
125 | return PageReserved(tail); | |
fc5659c8 | 126 | } |
cbff90a7 BAY |
127 | |
128 | return true; | |
129 | } | |
130 | ||
bccf2150 AK |
131 | /* |
132 | * Switches to specified vcpu, until a matching vcpu_put() | |
133 | */ | |
313a3dc7 | 134 | void vcpu_load(struct kvm_vcpu *vcpu) |
6aa8b732 | 135 | { |
15ad7146 AK |
136 | int cpu; |
137 | ||
bccf2150 | 138 | mutex_lock(&vcpu->mutex); |
34bb10b7 RR |
139 | if (unlikely(vcpu->pid != current->pids[PIDTYPE_PID].pid)) { |
140 | /* The thread running this VCPU changed. */ | |
141 | struct pid *oldpid = vcpu->pid; | |
142 | struct pid *newpid = get_task_pid(current, PIDTYPE_PID); | |
143 | rcu_assign_pointer(vcpu->pid, newpid); | |
144 | synchronize_rcu(); | |
145 | put_pid(oldpid); | |
146 | } | |
15ad7146 AK |
147 | cpu = get_cpu(); |
148 | preempt_notifier_register(&vcpu->preempt_notifier); | |
313a3dc7 | 149 | kvm_arch_vcpu_load(vcpu, cpu); |
15ad7146 | 150 | put_cpu(); |
6aa8b732 AK |
151 | } |
152 | ||
313a3dc7 | 153 | void vcpu_put(struct kvm_vcpu *vcpu) |
6aa8b732 | 154 | { |
15ad7146 | 155 | preempt_disable(); |
313a3dc7 | 156 | kvm_arch_vcpu_put(vcpu); |
15ad7146 AK |
157 | preempt_notifier_unregister(&vcpu->preempt_notifier); |
158 | preempt_enable(); | |
6aa8b732 AK |
159 | mutex_unlock(&vcpu->mutex); |
160 | } | |
161 | ||
d9e368d6 AK |
162 | static void ack_flush(void *_completed) |
163 | { | |
d9e368d6 AK |
164 | } |
165 | ||
49846896 | 166 | static bool make_all_cpus_request(struct kvm *kvm, unsigned int req) |
d9e368d6 | 167 | { |
597a5f55 | 168 | int i, cpu, me; |
6ef7a1bc RR |
169 | cpumask_var_t cpus; |
170 | bool called = true; | |
d9e368d6 | 171 | struct kvm_vcpu *vcpu; |
d9e368d6 | 172 | |
79f55997 | 173 | zalloc_cpumask_var(&cpus, GFP_ATOMIC); |
6ef7a1bc | 174 | |
3cba4130 | 175 | me = get_cpu(); |
988a2cae | 176 | kvm_for_each_vcpu(i, vcpu, kvm) { |
3cba4130 | 177 | kvm_make_request(req, vcpu); |
d9e368d6 | 178 | cpu = vcpu->cpu; |
6b7e2d09 XG |
179 | |
180 | /* Set ->requests bit before we read ->mode */ | |
181 | smp_mb(); | |
182 | ||
183 | if (cpus != NULL && cpu != -1 && cpu != me && | |
184 | kvm_vcpu_exiting_guest_mode(vcpu) != OUTSIDE_GUEST_MODE) | |
6ef7a1bc | 185 | cpumask_set_cpu(cpu, cpus); |
49846896 | 186 | } |
6ef7a1bc RR |
187 | if (unlikely(cpus == NULL)) |
188 | smp_call_function_many(cpu_online_mask, ack_flush, NULL, 1); | |
189 | else if (!cpumask_empty(cpus)) | |
190 | smp_call_function_many(cpus, ack_flush, NULL, 1); | |
191 | else | |
192 | called = false; | |
3cba4130 | 193 | put_cpu(); |
6ef7a1bc | 194 | free_cpumask_var(cpus); |
49846896 | 195 | return called; |
d9e368d6 AK |
196 | } |
197 | ||
49846896 | 198 | void kvm_flush_remote_tlbs(struct kvm *kvm) |
2e53d63a | 199 | { |
a4ee1ca4 XG |
200 | int dirty_count = kvm->tlbs_dirty; |
201 | ||
202 | smp_mb(); | |
49846896 RR |
203 | if (make_all_cpus_request(kvm, KVM_REQ_TLB_FLUSH)) |
204 | ++kvm->stat.remote_tlb_flush; | |
a4ee1ca4 | 205 | cmpxchg(&kvm->tlbs_dirty, dirty_count, 0); |
2e53d63a MT |
206 | } |
207 | ||
49846896 RR |
208 | void kvm_reload_remote_mmus(struct kvm *kvm) |
209 | { | |
210 | make_all_cpus_request(kvm, KVM_REQ_MMU_RELOAD); | |
211 | } | |
2e53d63a | 212 | |
fb3f0f51 RR |
213 | int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id) |
214 | { | |
215 | struct page *page; | |
216 | int r; | |
217 | ||
218 | mutex_init(&vcpu->mutex); | |
219 | vcpu->cpu = -1; | |
fb3f0f51 RR |
220 | vcpu->kvm = kvm; |
221 | vcpu->vcpu_id = id; | |
34bb10b7 | 222 | vcpu->pid = NULL; |
b6958ce4 | 223 | init_waitqueue_head(&vcpu->wq); |
af585b92 | 224 | kvm_async_pf_vcpu_init(vcpu); |
fb3f0f51 RR |
225 | |
226 | page = alloc_page(GFP_KERNEL | __GFP_ZERO); | |
227 | if (!page) { | |
228 | r = -ENOMEM; | |
229 | goto fail; | |
230 | } | |
231 | vcpu->run = page_address(page); | |
232 | ||
e9b11c17 | 233 | r = kvm_arch_vcpu_init(vcpu); |
fb3f0f51 | 234 | if (r < 0) |
e9b11c17 | 235 | goto fail_free_run; |
fb3f0f51 RR |
236 | return 0; |
237 | ||
fb3f0f51 RR |
238 | fail_free_run: |
239 | free_page((unsigned long)vcpu->run); | |
240 | fail: | |
76fafa5e | 241 | return r; |
fb3f0f51 RR |
242 | } |
243 | EXPORT_SYMBOL_GPL(kvm_vcpu_init); | |
244 | ||
245 | void kvm_vcpu_uninit(struct kvm_vcpu *vcpu) | |
246 | { | |
34bb10b7 | 247 | put_pid(vcpu->pid); |
e9b11c17 | 248 | kvm_arch_vcpu_uninit(vcpu); |
fb3f0f51 RR |
249 | free_page((unsigned long)vcpu->run); |
250 | } | |
251 | EXPORT_SYMBOL_GPL(kvm_vcpu_uninit); | |
252 | ||
e930bffe AA |
253 | #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER) |
254 | static inline struct kvm *mmu_notifier_to_kvm(struct mmu_notifier *mn) | |
255 | { | |
256 | return container_of(mn, struct kvm, mmu_notifier); | |
257 | } | |
258 | ||
259 | static void kvm_mmu_notifier_invalidate_page(struct mmu_notifier *mn, | |
260 | struct mm_struct *mm, | |
261 | unsigned long address) | |
262 | { | |
263 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
bc6678a3 | 264 | int need_tlb_flush, idx; |
e930bffe AA |
265 | |
266 | /* | |
267 | * When ->invalidate_page runs, the linux pte has been zapped | |
268 | * already but the page is still allocated until | |
269 | * ->invalidate_page returns. So if we increase the sequence | |
270 | * here the kvm page fault will notice if the spte can't be | |
271 | * established because the page is going to be freed. If | |
272 | * instead the kvm page fault establishes the spte before | |
273 | * ->invalidate_page runs, kvm_unmap_hva will release it | |
274 | * before returning. | |
275 | * | |
276 | * The sequence increase only need to be seen at spin_unlock | |
277 | * time, and not at spin_lock time. | |
278 | * | |
279 | * Increasing the sequence after the spin_unlock would be | |
280 | * unsafe because the kvm page fault could then establish the | |
281 | * pte after kvm_unmap_hva returned, without noticing the page | |
282 | * is going to be freed. | |
283 | */ | |
bc6678a3 | 284 | idx = srcu_read_lock(&kvm->srcu); |
e930bffe AA |
285 | spin_lock(&kvm->mmu_lock); |
286 | kvm->mmu_notifier_seq++; | |
a4ee1ca4 | 287 | need_tlb_flush = kvm_unmap_hva(kvm, address) | kvm->tlbs_dirty; |
e930bffe | 288 | spin_unlock(&kvm->mmu_lock); |
bc6678a3 | 289 | srcu_read_unlock(&kvm->srcu, idx); |
e930bffe AA |
290 | |
291 | /* we've to flush the tlb before the pages can be freed */ | |
292 | if (need_tlb_flush) | |
293 | kvm_flush_remote_tlbs(kvm); | |
294 | ||
295 | } | |
296 | ||
3da0dd43 IE |
297 | static void kvm_mmu_notifier_change_pte(struct mmu_notifier *mn, |
298 | struct mm_struct *mm, | |
299 | unsigned long address, | |
300 | pte_t pte) | |
301 | { | |
302 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
bc6678a3 | 303 | int idx; |
3da0dd43 | 304 | |
bc6678a3 | 305 | idx = srcu_read_lock(&kvm->srcu); |
3da0dd43 IE |
306 | spin_lock(&kvm->mmu_lock); |
307 | kvm->mmu_notifier_seq++; | |
308 | kvm_set_spte_hva(kvm, address, pte); | |
309 | spin_unlock(&kvm->mmu_lock); | |
bc6678a3 | 310 | srcu_read_unlock(&kvm->srcu, idx); |
3da0dd43 IE |
311 | } |
312 | ||
e930bffe AA |
313 | static void kvm_mmu_notifier_invalidate_range_start(struct mmu_notifier *mn, |
314 | struct mm_struct *mm, | |
315 | unsigned long start, | |
316 | unsigned long end) | |
317 | { | |
318 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
bc6678a3 | 319 | int need_tlb_flush = 0, idx; |
e930bffe | 320 | |
bc6678a3 | 321 | idx = srcu_read_lock(&kvm->srcu); |
e930bffe AA |
322 | spin_lock(&kvm->mmu_lock); |
323 | /* | |
324 | * The count increase must become visible at unlock time as no | |
325 | * spte can be established without taking the mmu_lock and | |
326 | * count is also read inside the mmu_lock critical section. | |
327 | */ | |
328 | kvm->mmu_notifier_count++; | |
329 | for (; start < end; start += PAGE_SIZE) | |
330 | need_tlb_flush |= kvm_unmap_hva(kvm, start); | |
a4ee1ca4 | 331 | need_tlb_flush |= kvm->tlbs_dirty; |
e930bffe | 332 | spin_unlock(&kvm->mmu_lock); |
bc6678a3 | 333 | srcu_read_unlock(&kvm->srcu, idx); |
e930bffe AA |
334 | |
335 | /* we've to flush the tlb before the pages can be freed */ | |
336 | if (need_tlb_flush) | |
337 | kvm_flush_remote_tlbs(kvm); | |
338 | } | |
339 | ||
340 | static void kvm_mmu_notifier_invalidate_range_end(struct mmu_notifier *mn, | |
341 | struct mm_struct *mm, | |
342 | unsigned long start, | |
343 | unsigned long end) | |
344 | { | |
345 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
346 | ||
347 | spin_lock(&kvm->mmu_lock); | |
348 | /* | |
349 | * This sequence increase will notify the kvm page fault that | |
350 | * the page that is going to be mapped in the spte could have | |
351 | * been freed. | |
352 | */ | |
353 | kvm->mmu_notifier_seq++; | |
354 | /* | |
355 | * The above sequence increase must be visible before the | |
356 | * below count decrease but both values are read by the kvm | |
357 | * page fault under mmu_lock spinlock so we don't need to add | |
358 | * a smb_wmb() here in between the two. | |
359 | */ | |
360 | kvm->mmu_notifier_count--; | |
361 | spin_unlock(&kvm->mmu_lock); | |
362 | ||
363 | BUG_ON(kvm->mmu_notifier_count < 0); | |
364 | } | |
365 | ||
366 | static int kvm_mmu_notifier_clear_flush_young(struct mmu_notifier *mn, | |
367 | struct mm_struct *mm, | |
368 | unsigned long address) | |
369 | { | |
370 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
bc6678a3 | 371 | int young, idx; |
e930bffe | 372 | |
bc6678a3 | 373 | idx = srcu_read_lock(&kvm->srcu); |
e930bffe AA |
374 | spin_lock(&kvm->mmu_lock); |
375 | young = kvm_age_hva(kvm, address); | |
376 | spin_unlock(&kvm->mmu_lock); | |
bc6678a3 | 377 | srcu_read_unlock(&kvm->srcu, idx); |
e930bffe AA |
378 | |
379 | if (young) | |
380 | kvm_flush_remote_tlbs(kvm); | |
381 | ||
382 | return young; | |
383 | } | |
384 | ||
8ee53820 AA |
385 | static int kvm_mmu_notifier_test_young(struct mmu_notifier *mn, |
386 | struct mm_struct *mm, | |
387 | unsigned long address) | |
388 | { | |
389 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
390 | int young, idx; | |
391 | ||
392 | idx = srcu_read_lock(&kvm->srcu); | |
393 | spin_lock(&kvm->mmu_lock); | |
394 | young = kvm_test_age_hva(kvm, address); | |
395 | spin_unlock(&kvm->mmu_lock); | |
396 | srcu_read_unlock(&kvm->srcu, idx); | |
397 | ||
398 | return young; | |
399 | } | |
400 | ||
85db06e5 MT |
401 | static void kvm_mmu_notifier_release(struct mmu_notifier *mn, |
402 | struct mm_struct *mm) | |
403 | { | |
404 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
eda2beda LJ |
405 | int idx; |
406 | ||
407 | idx = srcu_read_lock(&kvm->srcu); | |
85db06e5 | 408 | kvm_arch_flush_shadow(kvm); |
eda2beda | 409 | srcu_read_unlock(&kvm->srcu, idx); |
85db06e5 MT |
410 | } |
411 | ||
e930bffe AA |
412 | static const struct mmu_notifier_ops kvm_mmu_notifier_ops = { |
413 | .invalidate_page = kvm_mmu_notifier_invalidate_page, | |
414 | .invalidate_range_start = kvm_mmu_notifier_invalidate_range_start, | |
415 | .invalidate_range_end = kvm_mmu_notifier_invalidate_range_end, | |
416 | .clear_flush_young = kvm_mmu_notifier_clear_flush_young, | |
8ee53820 | 417 | .test_young = kvm_mmu_notifier_test_young, |
3da0dd43 | 418 | .change_pte = kvm_mmu_notifier_change_pte, |
85db06e5 | 419 | .release = kvm_mmu_notifier_release, |
e930bffe | 420 | }; |
4c07b0a4 AK |
421 | |
422 | static int kvm_init_mmu_notifier(struct kvm *kvm) | |
423 | { | |
424 | kvm->mmu_notifier.ops = &kvm_mmu_notifier_ops; | |
425 | return mmu_notifier_register(&kvm->mmu_notifier, current->mm); | |
426 | } | |
427 | ||
428 | #else /* !(CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER) */ | |
429 | ||
430 | static int kvm_init_mmu_notifier(struct kvm *kvm) | |
431 | { | |
432 | return 0; | |
433 | } | |
434 | ||
e930bffe AA |
435 | #endif /* CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER */ |
436 | ||
f17abe9a | 437 | static struct kvm *kvm_create_vm(void) |
6aa8b732 | 438 | { |
d89f5eff JK |
439 | int r, i; |
440 | struct kvm *kvm = kvm_arch_alloc_vm(); | |
6aa8b732 | 441 | |
d89f5eff JK |
442 | if (!kvm) |
443 | return ERR_PTR(-ENOMEM); | |
444 | ||
445 | r = kvm_arch_init_vm(kvm); | |
446 | if (r) | |
447 | goto out_err_nodisable; | |
10474ae8 AG |
448 | |
449 | r = hardware_enable_all(); | |
450 | if (r) | |
451 | goto out_err_nodisable; | |
452 | ||
75858a84 AK |
453 | #ifdef CONFIG_HAVE_KVM_IRQCHIP |
454 | INIT_HLIST_HEAD(&kvm->mask_notifier_list); | |
136bdfee | 455 | INIT_HLIST_HEAD(&kvm->irq_ack_notifier_list); |
75858a84 | 456 | #endif |
6aa8b732 | 457 | |
46a26bf5 MT |
458 | r = -ENOMEM; |
459 | kvm->memslots = kzalloc(sizeof(struct kvm_memslots), GFP_KERNEL); | |
460 | if (!kvm->memslots) | |
57e7fbee | 461 | goto out_err_nosrcu; |
bc6678a3 | 462 | if (init_srcu_struct(&kvm->srcu)) |
57e7fbee | 463 | goto out_err_nosrcu; |
e93f8a0f MT |
464 | for (i = 0; i < KVM_NR_BUSES; i++) { |
465 | kvm->buses[i] = kzalloc(sizeof(struct kvm_io_bus), | |
466 | GFP_KERNEL); | |
57e7fbee | 467 | if (!kvm->buses[i]) |
e93f8a0f | 468 | goto out_err; |
e93f8a0f | 469 | } |
85722cda | 470 | spin_lock_init(&kvm->mmu_lock); |
46a26bf5 | 471 | |
4c07b0a4 | 472 | r = kvm_init_mmu_notifier(kvm); |
57e7fbee | 473 | if (r) |
283d0c65 | 474 | goto out_err; |
e930bffe | 475 | |
6d4e4c4f AK |
476 | kvm->mm = current->mm; |
477 | atomic_inc(&kvm->mm->mm_count); | |
d34e6b17 | 478 | kvm_eventfd_init(kvm); |
11ec2804 | 479 | mutex_init(&kvm->lock); |
60eead79 | 480 | mutex_init(&kvm->irq_lock); |
79fac95e | 481 | mutex_init(&kvm->slots_lock); |
d39f13b0 | 482 | atomic_set(&kvm->users_count, 1); |
e935b837 | 483 | raw_spin_lock(&kvm_lock); |
5e58cfe4 | 484 | list_add(&kvm->vm_list, &vm_list); |
e935b837 | 485 | raw_spin_unlock(&kvm_lock); |
d89f5eff | 486 | |
f17abe9a | 487 | return kvm; |
10474ae8 AG |
488 | |
489 | out_err: | |
57e7fbee JK |
490 | cleanup_srcu_struct(&kvm->srcu); |
491 | out_err_nosrcu: | |
10474ae8 AG |
492 | hardware_disable_all(); |
493 | out_err_nodisable: | |
e93f8a0f MT |
494 | for (i = 0; i < KVM_NR_BUSES; i++) |
495 | kfree(kvm->buses[i]); | |
46a26bf5 | 496 | kfree(kvm->memslots); |
d89f5eff | 497 | kvm_arch_free_vm(kvm); |
10474ae8 | 498 | return ERR_PTR(r); |
f17abe9a AK |
499 | } |
500 | ||
a36a57b1 TY |
501 | static void kvm_destroy_dirty_bitmap(struct kvm_memory_slot *memslot) |
502 | { | |
503 | if (!memslot->dirty_bitmap) | |
504 | return; | |
505 | ||
6f9e5c17 TY |
506 | if (2 * kvm_dirty_bitmap_bytes(memslot) > PAGE_SIZE) |
507 | vfree(memslot->dirty_bitmap_head); | |
508 | else | |
509 | kfree(memslot->dirty_bitmap_head); | |
510 | ||
a36a57b1 | 511 | memslot->dirty_bitmap = NULL; |
515a0127 | 512 | memslot->dirty_bitmap_head = NULL; |
a36a57b1 TY |
513 | } |
514 | ||
6aa8b732 AK |
515 | /* |
516 | * Free any memory in @free but not in @dont. | |
517 | */ | |
518 | static void kvm_free_physmem_slot(struct kvm_memory_slot *free, | |
519 | struct kvm_memory_slot *dont) | |
520 | { | |
ec04b260 JR |
521 | int i; |
522 | ||
290fc38d IE |
523 | if (!dont || free->rmap != dont->rmap) |
524 | vfree(free->rmap); | |
6aa8b732 AK |
525 | |
526 | if (!dont || free->dirty_bitmap != dont->dirty_bitmap) | |
a36a57b1 | 527 | kvm_destroy_dirty_bitmap(free); |
6aa8b732 | 528 | |
ec04b260 JR |
529 | |
530 | for (i = 0; i < KVM_NR_PAGE_SIZES - 1; ++i) { | |
531 | if (!dont || free->lpage_info[i] != dont->lpage_info[i]) { | |
532 | vfree(free->lpage_info[i]); | |
533 | free->lpage_info[i] = NULL; | |
534 | } | |
535 | } | |
05da4558 | 536 | |
6aa8b732 | 537 | free->npages = 0; |
8d4e1288 | 538 | free->rmap = NULL; |
6aa8b732 AK |
539 | } |
540 | ||
d19a9cd2 | 541 | void kvm_free_physmem(struct kvm *kvm) |
6aa8b732 AK |
542 | { |
543 | int i; | |
46a26bf5 MT |
544 | struct kvm_memslots *slots = kvm->memslots; |
545 | ||
546 | for (i = 0; i < slots->nmemslots; ++i) | |
547 | kvm_free_physmem_slot(&slots->memslots[i], NULL); | |
6aa8b732 | 548 | |
46a26bf5 | 549 | kfree(kvm->memslots); |
6aa8b732 AK |
550 | } |
551 | ||
f17abe9a AK |
552 | static void kvm_destroy_vm(struct kvm *kvm) |
553 | { | |
e93f8a0f | 554 | int i; |
6d4e4c4f AK |
555 | struct mm_struct *mm = kvm->mm; |
556 | ||
ad8ba2cd | 557 | kvm_arch_sync_events(kvm); |
e935b837 | 558 | raw_spin_lock(&kvm_lock); |
133de902 | 559 | list_del(&kvm->vm_list); |
e935b837 | 560 | raw_spin_unlock(&kvm_lock); |
399ec807 | 561 | kvm_free_irq_routing(kvm); |
e93f8a0f MT |
562 | for (i = 0; i < KVM_NR_BUSES; i++) |
563 | kvm_io_bus_destroy(kvm->buses[i]); | |
980da6ce | 564 | kvm_coalesced_mmio_free(kvm); |
e930bffe AA |
565 | #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER) |
566 | mmu_notifier_unregister(&kvm->mmu_notifier, kvm->mm); | |
f00be0ca GN |
567 | #else |
568 | kvm_arch_flush_shadow(kvm); | |
5f94c174 | 569 | #endif |
d19a9cd2 | 570 | kvm_arch_destroy_vm(kvm); |
d89f5eff JK |
571 | kvm_free_physmem(kvm); |
572 | cleanup_srcu_struct(&kvm->srcu); | |
573 | kvm_arch_free_vm(kvm); | |
10474ae8 | 574 | hardware_disable_all(); |
6d4e4c4f | 575 | mmdrop(mm); |
f17abe9a AK |
576 | } |
577 | ||
d39f13b0 IE |
578 | void kvm_get_kvm(struct kvm *kvm) |
579 | { | |
580 | atomic_inc(&kvm->users_count); | |
581 | } | |
582 | EXPORT_SYMBOL_GPL(kvm_get_kvm); | |
583 | ||
584 | void kvm_put_kvm(struct kvm *kvm) | |
585 | { | |
586 | if (atomic_dec_and_test(&kvm->users_count)) | |
587 | kvm_destroy_vm(kvm); | |
588 | } | |
589 | EXPORT_SYMBOL_GPL(kvm_put_kvm); | |
590 | ||
591 | ||
f17abe9a AK |
592 | static int kvm_vm_release(struct inode *inode, struct file *filp) |
593 | { | |
594 | struct kvm *kvm = filp->private_data; | |
595 | ||
721eecbf GH |
596 | kvm_irqfd_release(kvm); |
597 | ||
d39f13b0 | 598 | kvm_put_kvm(kvm); |
6aa8b732 AK |
599 | return 0; |
600 | } | |
601 | ||
d48ead8b | 602 | #ifndef CONFIG_S390 |
515a0127 TY |
603 | /* |
604 | * Allocation size is twice as large as the actual dirty bitmap size. | |
605 | * This makes it possible to do double buffering: see x86's | |
606 | * kvm_vm_ioctl_get_dirty_log(). | |
607 | */ | |
a36a57b1 TY |
608 | static int kvm_create_dirty_bitmap(struct kvm_memory_slot *memslot) |
609 | { | |
515a0127 | 610 | unsigned long dirty_bytes = 2 * kvm_dirty_bitmap_bytes(memslot); |
a36a57b1 | 611 | |
6f9e5c17 TY |
612 | if (dirty_bytes > PAGE_SIZE) |
613 | memslot->dirty_bitmap = vzalloc(dirty_bytes); | |
614 | else | |
615 | memslot->dirty_bitmap = kzalloc(dirty_bytes, GFP_KERNEL); | |
616 | ||
a36a57b1 TY |
617 | if (!memslot->dirty_bitmap) |
618 | return -ENOMEM; | |
619 | ||
515a0127 | 620 | memslot->dirty_bitmap_head = memslot->dirty_bitmap; |
a36a57b1 TY |
621 | return 0; |
622 | } | |
d48ead8b | 623 | #endif /* !CONFIG_S390 */ |
a36a57b1 | 624 | |
6aa8b732 AK |
625 | /* |
626 | * Allocate some memory and give it an address in the guest physical address | |
627 | * space. | |
628 | * | |
629 | * Discontiguous memory is allowed, mostly for framebuffers. | |
f78e0e2e | 630 | * |
10589a46 | 631 | * Must be called holding mmap_sem for write. |
6aa8b732 | 632 | */ |
f78e0e2e SY |
633 | int __kvm_set_memory_region(struct kvm *kvm, |
634 | struct kvm_userspace_memory_region *mem, | |
635 | int user_alloc) | |
6aa8b732 | 636 | { |
8234b22e | 637 | int r; |
6aa8b732 | 638 | gfn_t base_gfn; |
28bcb112 HC |
639 | unsigned long npages; |
640 | unsigned long i; | |
6aa8b732 AK |
641 | struct kvm_memory_slot *memslot; |
642 | struct kvm_memory_slot old, new; | |
bc6678a3 | 643 | struct kvm_memslots *slots, *old_memslots; |
6aa8b732 AK |
644 | |
645 | r = -EINVAL; | |
646 | /* General sanity checks */ | |
647 | if (mem->memory_size & (PAGE_SIZE - 1)) | |
648 | goto out; | |
649 | if (mem->guest_phys_addr & (PAGE_SIZE - 1)) | |
650 | goto out; | |
fa3d315a TY |
651 | /* We can read the guest memory with __xxx_user() later on. */ |
652 | if (user_alloc && | |
653 | ((mem->userspace_addr & (PAGE_SIZE - 1)) || | |
9e3bb6b6 HC |
654 | !access_ok(VERIFY_WRITE, |
655 | (void __user *)(unsigned long)mem->userspace_addr, | |
656 | mem->memory_size))) | |
78749809 | 657 | goto out; |
e0d62c7f | 658 | if (mem->slot >= KVM_MEMORY_SLOTS + KVM_PRIVATE_MEM_SLOTS) |
6aa8b732 AK |
659 | goto out; |
660 | if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr) | |
661 | goto out; | |
662 | ||
46a26bf5 | 663 | memslot = &kvm->memslots->memslots[mem->slot]; |
6aa8b732 AK |
664 | base_gfn = mem->guest_phys_addr >> PAGE_SHIFT; |
665 | npages = mem->memory_size >> PAGE_SHIFT; | |
666 | ||
660c22c4 TY |
667 | r = -EINVAL; |
668 | if (npages > KVM_MEM_MAX_NR_PAGES) | |
669 | goto out; | |
670 | ||
6aa8b732 AK |
671 | if (!npages) |
672 | mem->flags &= ~KVM_MEM_LOG_DIRTY_PAGES; | |
673 | ||
6aa8b732 AK |
674 | new = old = *memslot; |
675 | ||
e36d96f7 | 676 | new.id = mem->slot; |
6aa8b732 AK |
677 | new.base_gfn = base_gfn; |
678 | new.npages = npages; | |
679 | new.flags = mem->flags; | |
680 | ||
681 | /* Disallow changing a memory slot's size. */ | |
682 | r = -EINVAL; | |
683 | if (npages && old.npages && npages != old.npages) | |
f78e0e2e | 684 | goto out_free; |
6aa8b732 AK |
685 | |
686 | /* Check for overlaps */ | |
687 | r = -EEXIST; | |
688 | for (i = 0; i < KVM_MEMORY_SLOTS; ++i) { | |
46a26bf5 | 689 | struct kvm_memory_slot *s = &kvm->memslots->memslots[i]; |
6aa8b732 | 690 | |
4cd481f6 | 691 | if (s == memslot || !s->npages) |
6aa8b732 AK |
692 | continue; |
693 | if (!((base_gfn + npages <= s->base_gfn) || | |
694 | (base_gfn >= s->base_gfn + s->npages))) | |
f78e0e2e | 695 | goto out_free; |
6aa8b732 | 696 | } |
6aa8b732 | 697 | |
6aa8b732 AK |
698 | /* Free page dirty bitmap if unneeded */ |
699 | if (!(new.flags & KVM_MEM_LOG_DIRTY_PAGES)) | |
8b6d44c7 | 700 | new.dirty_bitmap = NULL; |
6aa8b732 AK |
701 | |
702 | r = -ENOMEM; | |
703 | ||
704 | /* Allocate if a slot is being created */ | |
eff0114a | 705 | #ifndef CONFIG_S390 |
8d4e1288 | 706 | if (npages && !new.rmap) { |
26535037 | 707 | new.rmap = vzalloc(npages * sizeof(*new.rmap)); |
290fc38d IE |
708 | |
709 | if (!new.rmap) | |
f78e0e2e | 710 | goto out_free; |
290fc38d | 711 | |
80b14b5b | 712 | new.user_alloc = user_alloc; |
bc6678a3 | 713 | new.userspace_addr = mem->userspace_addr; |
6aa8b732 | 714 | } |
ec04b260 JR |
715 | if (!npages) |
716 | goto skip_lpage; | |
05da4558 | 717 | |
ec04b260 | 718 | for (i = 0; i < KVM_NR_PAGE_SIZES - 1; ++i) { |
28bcb112 HC |
719 | unsigned long ugfn; |
720 | unsigned long j; | |
721 | int lpages; | |
ec04b260 | 722 | int level = i + 2; |
05da4558 | 723 | |
ec04b260 JR |
724 | /* Avoid unused variable warning if no large pages */ |
725 | (void)level; | |
726 | ||
727 | if (new.lpage_info[i]) | |
728 | continue; | |
729 | ||
82855413 JR |
730 | lpages = 1 + ((base_gfn + npages - 1) |
731 | >> KVM_HPAGE_GFN_SHIFT(level)); | |
732 | lpages -= base_gfn >> KVM_HPAGE_GFN_SHIFT(level); | |
ec04b260 | 733 | |
26535037 | 734 | new.lpage_info[i] = vzalloc(lpages * sizeof(*new.lpage_info[i])); |
ec04b260 JR |
735 | |
736 | if (!new.lpage_info[i]) | |
05da4558 MT |
737 | goto out_free; |
738 | ||
82855413 | 739 | if (base_gfn & (KVM_PAGES_PER_HPAGE(level) - 1)) |
ec04b260 | 740 | new.lpage_info[i][0].write_count = 1; |
82855413 | 741 | if ((base_gfn+npages) & (KVM_PAGES_PER_HPAGE(level) - 1)) |
ec04b260 | 742 | new.lpage_info[i][lpages - 1].write_count = 1; |
ac04527f AK |
743 | ugfn = new.userspace_addr >> PAGE_SHIFT; |
744 | /* | |
745 | * If the gfn and userspace address are not aligned wrt each | |
54dee993 MT |
746 | * other, or if explicitly asked to, disable large page |
747 | * support for this slot | |
ac04527f | 748 | */ |
ec04b260 | 749 | if ((base_gfn ^ ugfn) & (KVM_PAGES_PER_HPAGE(level) - 1) || |
54dee993 | 750 | !largepages_enabled) |
ec04b260 JR |
751 | for (j = 0; j < lpages; ++j) |
752 | new.lpage_info[i][j].write_count = 1; | |
05da4558 | 753 | } |
6aa8b732 | 754 | |
ec04b260 JR |
755 | skip_lpage: |
756 | ||
6aa8b732 AK |
757 | /* Allocate page dirty bitmap if needed */ |
758 | if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) { | |
a36a57b1 | 759 | if (kvm_create_dirty_bitmap(&new) < 0) |
f78e0e2e | 760 | goto out_free; |
bc6678a3 | 761 | /* destroy any largepage mappings for dirty tracking */ |
6aa8b732 | 762 | } |
3eea8437 CB |
763 | #else /* not defined CONFIG_S390 */ |
764 | new.user_alloc = user_alloc; | |
765 | if (user_alloc) | |
766 | new.userspace_addr = mem->userspace_addr; | |
eff0114a | 767 | #endif /* not defined CONFIG_S390 */ |
6aa8b732 | 768 | |
bc6678a3 MT |
769 | if (!npages) { |
770 | r = -ENOMEM; | |
771 | slots = kzalloc(sizeof(struct kvm_memslots), GFP_KERNEL); | |
772 | if (!slots) | |
773 | goto out_free; | |
774 | memcpy(slots, kvm->memslots, sizeof(struct kvm_memslots)); | |
775 | if (mem->slot >= slots->nmemslots) | |
776 | slots->nmemslots = mem->slot + 1; | |
49c7754c | 777 | slots->generation++; |
bc6678a3 MT |
778 | slots->memslots[mem->slot].flags |= KVM_MEMSLOT_INVALID; |
779 | ||
780 | old_memslots = kvm->memslots; | |
781 | rcu_assign_pointer(kvm->memslots, slots); | |
782 | synchronize_srcu_expedited(&kvm->srcu); | |
783 | /* From this point no new shadow pages pointing to a deleted | |
784 | * memslot will be created. | |
785 | * | |
786 | * validation of sp->gfn happens in: | |
787 | * - gfn_to_hva (kvm_read_guest, gfn_to_pfn) | |
788 | * - kvm_is_visible_gfn (mmu_check_roots) | |
789 | */ | |
34d4cb8f | 790 | kvm_arch_flush_shadow(kvm); |
bc6678a3 MT |
791 | kfree(old_memslots); |
792 | } | |
34d4cb8f | 793 | |
f7784b8e MT |
794 | r = kvm_arch_prepare_memory_region(kvm, &new, old, mem, user_alloc); |
795 | if (r) | |
796 | goto out_free; | |
797 | ||
bc6678a3 MT |
798 | /* map the pages in iommu page table */ |
799 | if (npages) { | |
800 | r = kvm_iommu_map_pages(kvm, &new); | |
801 | if (r) | |
802 | goto out_free; | |
803 | } | |
604b38ac | 804 | |
bc6678a3 MT |
805 | r = -ENOMEM; |
806 | slots = kzalloc(sizeof(struct kvm_memslots), GFP_KERNEL); | |
807 | if (!slots) | |
808 | goto out_free; | |
809 | memcpy(slots, kvm->memslots, sizeof(struct kvm_memslots)); | |
810 | if (mem->slot >= slots->nmemslots) | |
811 | slots->nmemslots = mem->slot + 1; | |
49c7754c | 812 | slots->generation++; |
bc6678a3 MT |
813 | |
814 | /* actual memory is freed via old in kvm_free_physmem_slot below */ | |
815 | if (!npages) { | |
816 | new.rmap = NULL; | |
817 | new.dirty_bitmap = NULL; | |
818 | for (i = 0; i < KVM_NR_PAGE_SIZES - 1; ++i) | |
819 | new.lpage_info[i] = NULL; | |
820 | } | |
821 | ||
822 | slots->memslots[mem->slot] = new; | |
823 | old_memslots = kvm->memslots; | |
824 | rcu_assign_pointer(kvm->memslots, slots); | |
825 | synchronize_srcu_expedited(&kvm->srcu); | |
3ad82a7e | 826 | |
f7784b8e | 827 | kvm_arch_commit_memory_region(kvm, mem, old, user_alloc); |
82ce2c96 | 828 | |
bc6678a3 MT |
829 | kvm_free_physmem_slot(&old, &new); |
830 | kfree(old_memslots); | |
831 | ||
6aa8b732 AK |
832 | return 0; |
833 | ||
f78e0e2e | 834 | out_free: |
6aa8b732 AK |
835 | kvm_free_physmem_slot(&new, &old); |
836 | out: | |
837 | return r; | |
210c7c4d IE |
838 | |
839 | } | |
f78e0e2e SY |
840 | EXPORT_SYMBOL_GPL(__kvm_set_memory_region); |
841 | ||
842 | int kvm_set_memory_region(struct kvm *kvm, | |
843 | struct kvm_userspace_memory_region *mem, | |
844 | int user_alloc) | |
845 | { | |
846 | int r; | |
847 | ||
79fac95e | 848 | mutex_lock(&kvm->slots_lock); |
f78e0e2e | 849 | r = __kvm_set_memory_region(kvm, mem, user_alloc); |
79fac95e | 850 | mutex_unlock(&kvm->slots_lock); |
f78e0e2e SY |
851 | return r; |
852 | } | |
210c7c4d IE |
853 | EXPORT_SYMBOL_GPL(kvm_set_memory_region); |
854 | ||
1fe779f8 CO |
855 | int kvm_vm_ioctl_set_memory_region(struct kvm *kvm, |
856 | struct | |
857 | kvm_userspace_memory_region *mem, | |
858 | int user_alloc) | |
210c7c4d | 859 | { |
e0d62c7f IE |
860 | if (mem->slot >= KVM_MEMORY_SLOTS) |
861 | return -EINVAL; | |
210c7c4d | 862 | return kvm_set_memory_region(kvm, mem, user_alloc); |
6aa8b732 AK |
863 | } |
864 | ||
5bb064dc ZX |
865 | int kvm_get_dirty_log(struct kvm *kvm, |
866 | struct kvm_dirty_log *log, int *is_dirty) | |
6aa8b732 AK |
867 | { |
868 | struct kvm_memory_slot *memslot; | |
869 | int r, i; | |
87bf6e7d | 870 | unsigned long n; |
6aa8b732 AK |
871 | unsigned long any = 0; |
872 | ||
6aa8b732 AK |
873 | r = -EINVAL; |
874 | if (log->slot >= KVM_MEMORY_SLOTS) | |
875 | goto out; | |
876 | ||
46a26bf5 | 877 | memslot = &kvm->memslots->memslots[log->slot]; |
6aa8b732 AK |
878 | r = -ENOENT; |
879 | if (!memslot->dirty_bitmap) | |
880 | goto out; | |
881 | ||
87bf6e7d | 882 | n = kvm_dirty_bitmap_bytes(memslot); |
6aa8b732 | 883 | |
cd1a4a98 | 884 | for (i = 0; !any && i < n/sizeof(long); ++i) |
6aa8b732 AK |
885 | any = memslot->dirty_bitmap[i]; |
886 | ||
887 | r = -EFAULT; | |
888 | if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n)) | |
889 | goto out; | |
890 | ||
5bb064dc ZX |
891 | if (any) |
892 | *is_dirty = 1; | |
6aa8b732 AK |
893 | |
894 | r = 0; | |
6aa8b732 | 895 | out: |
6aa8b732 AK |
896 | return r; |
897 | } | |
898 | ||
54dee993 MT |
899 | void kvm_disable_largepages(void) |
900 | { | |
901 | largepages_enabled = false; | |
902 | } | |
903 | EXPORT_SYMBOL_GPL(kvm_disable_largepages); | |
904 | ||
cea7bb21 IE |
905 | int is_error_page(struct page *page) |
906 | { | |
edba23e5 | 907 | return page == bad_page || page == hwpoison_page || page == fault_page; |
cea7bb21 IE |
908 | } |
909 | EXPORT_SYMBOL_GPL(is_error_page); | |
910 | ||
35149e21 AL |
911 | int is_error_pfn(pfn_t pfn) |
912 | { | |
edba23e5 | 913 | return pfn == bad_pfn || pfn == hwpoison_pfn || pfn == fault_pfn; |
35149e21 AL |
914 | } |
915 | EXPORT_SYMBOL_GPL(is_error_pfn); | |
916 | ||
bf998156 HY |
917 | int is_hwpoison_pfn(pfn_t pfn) |
918 | { | |
919 | return pfn == hwpoison_pfn; | |
920 | } | |
921 | EXPORT_SYMBOL_GPL(is_hwpoison_pfn); | |
922 | ||
edba23e5 GN |
923 | int is_fault_pfn(pfn_t pfn) |
924 | { | |
925 | return pfn == fault_pfn; | |
926 | } | |
927 | EXPORT_SYMBOL_GPL(is_fault_pfn); | |
928 | ||
f9d46eb0 IE |
929 | static inline unsigned long bad_hva(void) |
930 | { | |
931 | return PAGE_OFFSET; | |
932 | } | |
933 | ||
934 | int kvm_is_error_hva(unsigned long addr) | |
935 | { | |
936 | return addr == bad_hva(); | |
937 | } | |
938 | EXPORT_SYMBOL_GPL(kvm_is_error_hva); | |
939 | ||
49c7754c GN |
940 | static struct kvm_memory_slot *__gfn_to_memslot(struct kvm_memslots *slots, |
941 | gfn_t gfn) | |
6aa8b732 AK |
942 | { |
943 | int i; | |
944 | ||
46a26bf5 MT |
945 | for (i = 0; i < slots->nmemslots; ++i) { |
946 | struct kvm_memory_slot *memslot = &slots->memslots[i]; | |
6aa8b732 AK |
947 | |
948 | if (gfn >= memslot->base_gfn | |
949 | && gfn < memslot->base_gfn + memslot->npages) | |
950 | return memslot; | |
951 | } | |
8b6d44c7 | 952 | return NULL; |
6aa8b732 | 953 | } |
49c7754c GN |
954 | |
955 | struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn) | |
956 | { | |
957 | return __gfn_to_memslot(kvm_memslots(kvm), gfn); | |
958 | } | |
a1f4d395 | 959 | EXPORT_SYMBOL_GPL(gfn_to_memslot); |
6aa8b732 | 960 | |
e0d62c7f IE |
961 | int kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn) |
962 | { | |
963 | int i; | |
90d83dc3 | 964 | struct kvm_memslots *slots = kvm_memslots(kvm); |
e0d62c7f | 965 | |
e0d62c7f | 966 | for (i = 0; i < KVM_MEMORY_SLOTS; ++i) { |
46a26bf5 | 967 | struct kvm_memory_slot *memslot = &slots->memslots[i]; |
e0d62c7f | 968 | |
bc6678a3 MT |
969 | if (memslot->flags & KVM_MEMSLOT_INVALID) |
970 | continue; | |
971 | ||
e0d62c7f IE |
972 | if (gfn >= memslot->base_gfn |
973 | && gfn < memslot->base_gfn + memslot->npages) | |
974 | return 1; | |
975 | } | |
976 | return 0; | |
977 | } | |
978 | EXPORT_SYMBOL_GPL(kvm_is_visible_gfn); | |
979 | ||
8f0b1ab6 JR |
980 | unsigned long kvm_host_page_size(struct kvm *kvm, gfn_t gfn) |
981 | { | |
982 | struct vm_area_struct *vma; | |
983 | unsigned long addr, size; | |
984 | ||
985 | size = PAGE_SIZE; | |
986 | ||
987 | addr = gfn_to_hva(kvm, gfn); | |
988 | if (kvm_is_error_hva(addr)) | |
989 | return PAGE_SIZE; | |
990 | ||
991 | down_read(¤t->mm->mmap_sem); | |
992 | vma = find_vma(current->mm, addr); | |
993 | if (!vma) | |
994 | goto out; | |
995 | ||
996 | size = vma_kernel_pagesize(vma); | |
997 | ||
998 | out: | |
999 | up_read(¤t->mm->mmap_sem); | |
1000 | ||
1001 | return size; | |
1002 | } | |
1003 | ||
49c7754c | 1004 | static unsigned long gfn_to_hva_many(struct kvm_memory_slot *slot, gfn_t gfn, |
48987781 | 1005 | gfn_t *nr_pages) |
539cb660 | 1006 | { |
bc6678a3 | 1007 | if (!slot || slot->flags & KVM_MEMSLOT_INVALID) |
539cb660 | 1008 | return bad_hva(); |
48987781 XG |
1009 | |
1010 | if (nr_pages) | |
1011 | *nr_pages = slot->npages - (gfn - slot->base_gfn); | |
1012 | ||
f5c98031 | 1013 | return gfn_to_hva_memslot(slot, gfn); |
539cb660 | 1014 | } |
48987781 XG |
1015 | |
1016 | unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn) | |
1017 | { | |
49c7754c | 1018 | return gfn_to_hva_many(gfn_to_memslot(kvm, gfn), gfn, NULL); |
48987781 | 1019 | } |
0d150298 | 1020 | EXPORT_SYMBOL_GPL(gfn_to_hva); |
539cb660 | 1021 | |
8030089f GN |
1022 | static pfn_t get_fault_pfn(void) |
1023 | { | |
1024 | get_page(fault_page); | |
1025 | return fault_pfn; | |
1026 | } | |
1027 | ||
0857b9e9 GN |
1028 | int get_user_page_nowait(struct task_struct *tsk, struct mm_struct *mm, |
1029 | unsigned long start, int write, struct page **page) | |
1030 | { | |
1031 | int flags = FOLL_TOUCH | FOLL_NOWAIT | FOLL_HWPOISON | FOLL_GET; | |
1032 | ||
1033 | if (write) | |
1034 | flags |= FOLL_WRITE; | |
1035 | ||
1036 | return __get_user_pages(tsk, mm, start, 1, flags, page, NULL, NULL); | |
1037 | } | |
1038 | ||
fafc3dba HY |
1039 | static inline int check_user_page_hwpoison(unsigned long addr) |
1040 | { | |
1041 | int rc, flags = FOLL_TOUCH | FOLL_HWPOISON | FOLL_WRITE; | |
1042 | ||
1043 | rc = __get_user_pages(current, current->mm, addr, 1, | |
1044 | flags, NULL, NULL, NULL); | |
1045 | return rc == -EHWPOISON; | |
1046 | } | |
1047 | ||
af585b92 | 1048 | static pfn_t hva_to_pfn(struct kvm *kvm, unsigned long addr, bool atomic, |
612819c3 | 1049 | bool *async, bool write_fault, bool *writable) |
954bbbc2 | 1050 | { |
8d4e1288 | 1051 | struct page *page[1]; |
af585b92 | 1052 | int npages = 0; |
2e2e3738 | 1053 | pfn_t pfn; |
954bbbc2 | 1054 | |
af585b92 GN |
1055 | /* we can do it either atomically or asynchronously, not both */ |
1056 | BUG_ON(atomic && async); | |
1057 | ||
612819c3 MT |
1058 | BUG_ON(!write_fault && !writable); |
1059 | ||
1060 | if (writable) | |
1061 | *writable = true; | |
1062 | ||
af585b92 | 1063 | if (atomic || async) |
887c08ac | 1064 | npages = __get_user_pages_fast(addr, 1, 1, page); |
af585b92 GN |
1065 | |
1066 | if (unlikely(npages != 1) && !atomic) { | |
887c08ac | 1067 | might_sleep(); |
612819c3 MT |
1068 | |
1069 | if (writable) | |
1070 | *writable = write_fault; | |
1071 | ||
0857b9e9 GN |
1072 | if (async) { |
1073 | down_read(¤t->mm->mmap_sem); | |
1074 | npages = get_user_page_nowait(current, current->mm, | |
1075 | addr, write_fault, page); | |
1076 | up_read(¤t->mm->mmap_sem); | |
1077 | } else | |
1078 | npages = get_user_pages_fast(addr, 1, write_fault, | |
1079 | page); | |
612819c3 MT |
1080 | |
1081 | /* map read fault as writable if possible */ | |
1082 | if (unlikely(!write_fault) && npages == 1) { | |
1083 | struct page *wpage[1]; | |
1084 | ||
1085 | npages = __get_user_pages_fast(addr, 1, 1, wpage); | |
1086 | if (npages == 1) { | |
1087 | *writable = true; | |
1088 | put_page(page[0]); | |
1089 | page[0] = wpage[0]; | |
1090 | } | |
1091 | npages = 1; | |
1092 | } | |
887c08ac | 1093 | } |
539cb660 | 1094 | |
2e2e3738 AL |
1095 | if (unlikely(npages != 1)) { |
1096 | struct vm_area_struct *vma; | |
1097 | ||
887c08ac | 1098 | if (atomic) |
8030089f | 1099 | return get_fault_pfn(); |
887c08ac | 1100 | |
bbeb3406 | 1101 | down_read(¤t->mm->mmap_sem); |
0857b9e9 GN |
1102 | if (npages == -EHWPOISON || |
1103 | (!async && check_user_page_hwpoison(addr))) { | |
bbeb3406 | 1104 | up_read(¤t->mm->mmap_sem); |
bf998156 HY |
1105 | get_page(hwpoison_page); |
1106 | return page_to_pfn(hwpoison_page); | |
1107 | } | |
1108 | ||
8030089f | 1109 | vma = find_vma_intersection(current->mm, addr, addr+1); |
4c2155ce | 1110 | |
8030089f GN |
1111 | if (vma == NULL) |
1112 | pfn = get_fault_pfn(); | |
1113 | else if ((vma->vm_flags & VM_PFNMAP)) { | |
1114 | pfn = ((addr - vma->vm_start) >> PAGE_SHIFT) + | |
1115 | vma->vm_pgoff; | |
1116 | BUG_ON(!kvm_is_mmio_pfn(pfn)); | |
1117 | } else { | |
1118 | if (async && (vma->vm_flags & VM_WRITE)) | |
af585b92 | 1119 | *async = true; |
8030089f | 1120 | pfn = get_fault_pfn(); |
2e2e3738 | 1121 | } |
4c2155ce | 1122 | up_read(¤t->mm->mmap_sem); |
2e2e3738 AL |
1123 | } else |
1124 | pfn = page_to_pfn(page[0]); | |
8d4e1288 | 1125 | |
2e2e3738 | 1126 | return pfn; |
35149e21 AL |
1127 | } |
1128 | ||
887c08ac XG |
1129 | pfn_t hva_to_pfn_atomic(struct kvm *kvm, unsigned long addr) |
1130 | { | |
612819c3 | 1131 | return hva_to_pfn(kvm, addr, true, NULL, true, NULL); |
887c08ac XG |
1132 | } |
1133 | EXPORT_SYMBOL_GPL(hva_to_pfn_atomic); | |
1134 | ||
612819c3 MT |
1135 | static pfn_t __gfn_to_pfn(struct kvm *kvm, gfn_t gfn, bool atomic, bool *async, |
1136 | bool write_fault, bool *writable) | |
506f0d6f MT |
1137 | { |
1138 | unsigned long addr; | |
1139 | ||
af585b92 GN |
1140 | if (async) |
1141 | *async = false; | |
1142 | ||
506f0d6f MT |
1143 | addr = gfn_to_hva(kvm, gfn); |
1144 | if (kvm_is_error_hva(addr)) { | |
1145 | get_page(bad_page); | |
1146 | return page_to_pfn(bad_page); | |
1147 | } | |
1148 | ||
612819c3 | 1149 | return hva_to_pfn(kvm, addr, atomic, async, write_fault, writable); |
365fb3fd XG |
1150 | } |
1151 | ||
1152 | pfn_t gfn_to_pfn_atomic(struct kvm *kvm, gfn_t gfn) | |
1153 | { | |
612819c3 | 1154 | return __gfn_to_pfn(kvm, gfn, true, NULL, true, NULL); |
365fb3fd XG |
1155 | } |
1156 | EXPORT_SYMBOL_GPL(gfn_to_pfn_atomic); | |
1157 | ||
612819c3 MT |
1158 | pfn_t gfn_to_pfn_async(struct kvm *kvm, gfn_t gfn, bool *async, |
1159 | bool write_fault, bool *writable) | |
af585b92 | 1160 | { |
612819c3 | 1161 | return __gfn_to_pfn(kvm, gfn, false, async, write_fault, writable); |
af585b92 GN |
1162 | } |
1163 | EXPORT_SYMBOL_GPL(gfn_to_pfn_async); | |
1164 | ||
365fb3fd XG |
1165 | pfn_t gfn_to_pfn(struct kvm *kvm, gfn_t gfn) |
1166 | { | |
612819c3 | 1167 | return __gfn_to_pfn(kvm, gfn, false, NULL, true, NULL); |
506f0d6f | 1168 | } |
35149e21 AL |
1169 | EXPORT_SYMBOL_GPL(gfn_to_pfn); |
1170 | ||
612819c3 MT |
1171 | pfn_t gfn_to_pfn_prot(struct kvm *kvm, gfn_t gfn, bool write_fault, |
1172 | bool *writable) | |
1173 | { | |
1174 | return __gfn_to_pfn(kvm, gfn, false, NULL, write_fault, writable); | |
1175 | } | |
1176 | EXPORT_SYMBOL_GPL(gfn_to_pfn_prot); | |
1177 | ||
506f0d6f MT |
1178 | pfn_t gfn_to_pfn_memslot(struct kvm *kvm, |
1179 | struct kvm_memory_slot *slot, gfn_t gfn) | |
1180 | { | |
1181 | unsigned long addr = gfn_to_hva_memslot(slot, gfn); | |
612819c3 | 1182 | return hva_to_pfn(kvm, addr, false, NULL, true, NULL); |
506f0d6f MT |
1183 | } |
1184 | ||
48987781 XG |
1185 | int gfn_to_page_many_atomic(struct kvm *kvm, gfn_t gfn, struct page **pages, |
1186 | int nr_pages) | |
1187 | { | |
1188 | unsigned long addr; | |
1189 | gfn_t entry; | |
1190 | ||
49c7754c | 1191 | addr = gfn_to_hva_many(gfn_to_memslot(kvm, gfn), gfn, &entry); |
48987781 XG |
1192 | if (kvm_is_error_hva(addr)) |
1193 | return -1; | |
1194 | ||
1195 | if (entry < nr_pages) | |
1196 | return 0; | |
1197 | ||
1198 | return __get_user_pages_fast(addr, nr_pages, 1, pages); | |
1199 | } | |
1200 | EXPORT_SYMBOL_GPL(gfn_to_page_many_atomic); | |
1201 | ||
35149e21 AL |
1202 | struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn) |
1203 | { | |
2e2e3738 AL |
1204 | pfn_t pfn; |
1205 | ||
1206 | pfn = gfn_to_pfn(kvm, gfn); | |
c77fb9dc | 1207 | if (!kvm_is_mmio_pfn(pfn)) |
2e2e3738 AL |
1208 | return pfn_to_page(pfn); |
1209 | ||
c77fb9dc | 1210 | WARN_ON(kvm_is_mmio_pfn(pfn)); |
2e2e3738 AL |
1211 | |
1212 | get_page(bad_page); | |
1213 | return bad_page; | |
954bbbc2 | 1214 | } |
aab61cc0 | 1215 | |
954bbbc2 AK |
1216 | EXPORT_SYMBOL_GPL(gfn_to_page); |
1217 | ||
b4231d61 IE |
1218 | void kvm_release_page_clean(struct page *page) |
1219 | { | |
35149e21 | 1220 | kvm_release_pfn_clean(page_to_pfn(page)); |
b4231d61 IE |
1221 | } |
1222 | EXPORT_SYMBOL_GPL(kvm_release_page_clean); | |
1223 | ||
35149e21 AL |
1224 | void kvm_release_pfn_clean(pfn_t pfn) |
1225 | { | |
c77fb9dc | 1226 | if (!kvm_is_mmio_pfn(pfn)) |
2e2e3738 | 1227 | put_page(pfn_to_page(pfn)); |
35149e21 AL |
1228 | } |
1229 | EXPORT_SYMBOL_GPL(kvm_release_pfn_clean); | |
1230 | ||
b4231d61 | 1231 | void kvm_release_page_dirty(struct page *page) |
8a7ae055 | 1232 | { |
35149e21 AL |
1233 | kvm_release_pfn_dirty(page_to_pfn(page)); |
1234 | } | |
1235 | EXPORT_SYMBOL_GPL(kvm_release_page_dirty); | |
1236 | ||
1237 | void kvm_release_pfn_dirty(pfn_t pfn) | |
1238 | { | |
1239 | kvm_set_pfn_dirty(pfn); | |
1240 | kvm_release_pfn_clean(pfn); | |
1241 | } | |
1242 | EXPORT_SYMBOL_GPL(kvm_release_pfn_dirty); | |
1243 | ||
1244 | void kvm_set_page_dirty(struct page *page) | |
1245 | { | |
1246 | kvm_set_pfn_dirty(page_to_pfn(page)); | |
1247 | } | |
1248 | EXPORT_SYMBOL_GPL(kvm_set_page_dirty); | |
1249 | ||
1250 | void kvm_set_pfn_dirty(pfn_t pfn) | |
1251 | { | |
c77fb9dc | 1252 | if (!kvm_is_mmio_pfn(pfn)) { |
2e2e3738 AL |
1253 | struct page *page = pfn_to_page(pfn); |
1254 | if (!PageReserved(page)) | |
1255 | SetPageDirty(page); | |
1256 | } | |
8a7ae055 | 1257 | } |
35149e21 AL |
1258 | EXPORT_SYMBOL_GPL(kvm_set_pfn_dirty); |
1259 | ||
1260 | void kvm_set_pfn_accessed(pfn_t pfn) | |
1261 | { | |
c77fb9dc | 1262 | if (!kvm_is_mmio_pfn(pfn)) |
2e2e3738 | 1263 | mark_page_accessed(pfn_to_page(pfn)); |
35149e21 AL |
1264 | } |
1265 | EXPORT_SYMBOL_GPL(kvm_set_pfn_accessed); | |
1266 | ||
1267 | void kvm_get_pfn(pfn_t pfn) | |
1268 | { | |
c77fb9dc | 1269 | if (!kvm_is_mmio_pfn(pfn)) |
2e2e3738 | 1270 | get_page(pfn_to_page(pfn)); |
35149e21 AL |
1271 | } |
1272 | EXPORT_SYMBOL_GPL(kvm_get_pfn); | |
8a7ae055 | 1273 | |
195aefde IE |
1274 | static int next_segment(unsigned long len, int offset) |
1275 | { | |
1276 | if (len > PAGE_SIZE - offset) | |
1277 | return PAGE_SIZE - offset; | |
1278 | else | |
1279 | return len; | |
1280 | } | |
1281 | ||
1282 | int kvm_read_guest_page(struct kvm *kvm, gfn_t gfn, void *data, int offset, | |
1283 | int len) | |
1284 | { | |
e0506bcb IE |
1285 | int r; |
1286 | unsigned long addr; | |
195aefde | 1287 | |
e0506bcb IE |
1288 | addr = gfn_to_hva(kvm, gfn); |
1289 | if (kvm_is_error_hva(addr)) | |
1290 | return -EFAULT; | |
fa3d315a | 1291 | r = __copy_from_user(data, (void __user *)addr + offset, len); |
e0506bcb | 1292 | if (r) |
195aefde | 1293 | return -EFAULT; |
195aefde IE |
1294 | return 0; |
1295 | } | |
1296 | EXPORT_SYMBOL_GPL(kvm_read_guest_page); | |
1297 | ||
1298 | int kvm_read_guest(struct kvm *kvm, gpa_t gpa, void *data, unsigned long len) | |
1299 | { | |
1300 | gfn_t gfn = gpa >> PAGE_SHIFT; | |
1301 | int seg; | |
1302 | int offset = offset_in_page(gpa); | |
1303 | int ret; | |
1304 | ||
1305 | while ((seg = next_segment(len, offset)) != 0) { | |
1306 | ret = kvm_read_guest_page(kvm, gfn, data, offset, seg); | |
1307 | if (ret < 0) | |
1308 | return ret; | |
1309 | offset = 0; | |
1310 | len -= seg; | |
1311 | data += seg; | |
1312 | ++gfn; | |
1313 | } | |
1314 | return 0; | |
1315 | } | |
1316 | EXPORT_SYMBOL_GPL(kvm_read_guest); | |
1317 | ||
7ec54588 MT |
1318 | int kvm_read_guest_atomic(struct kvm *kvm, gpa_t gpa, void *data, |
1319 | unsigned long len) | |
1320 | { | |
1321 | int r; | |
1322 | unsigned long addr; | |
1323 | gfn_t gfn = gpa >> PAGE_SHIFT; | |
1324 | int offset = offset_in_page(gpa); | |
1325 | ||
1326 | addr = gfn_to_hva(kvm, gfn); | |
1327 | if (kvm_is_error_hva(addr)) | |
1328 | return -EFAULT; | |
0aac03f0 | 1329 | pagefault_disable(); |
7ec54588 | 1330 | r = __copy_from_user_inatomic(data, (void __user *)addr + offset, len); |
0aac03f0 | 1331 | pagefault_enable(); |
7ec54588 MT |
1332 | if (r) |
1333 | return -EFAULT; | |
1334 | return 0; | |
1335 | } | |
1336 | EXPORT_SYMBOL(kvm_read_guest_atomic); | |
1337 | ||
195aefde IE |
1338 | int kvm_write_guest_page(struct kvm *kvm, gfn_t gfn, const void *data, |
1339 | int offset, int len) | |
1340 | { | |
e0506bcb IE |
1341 | int r; |
1342 | unsigned long addr; | |
195aefde | 1343 | |
e0506bcb IE |
1344 | addr = gfn_to_hva(kvm, gfn); |
1345 | if (kvm_is_error_hva(addr)) | |
1346 | return -EFAULT; | |
1347 | r = copy_to_user((void __user *)addr + offset, data, len); | |
1348 | if (r) | |
195aefde | 1349 | return -EFAULT; |
195aefde IE |
1350 | mark_page_dirty(kvm, gfn); |
1351 | return 0; | |
1352 | } | |
1353 | EXPORT_SYMBOL_GPL(kvm_write_guest_page); | |
1354 | ||
1355 | int kvm_write_guest(struct kvm *kvm, gpa_t gpa, const void *data, | |
1356 | unsigned long len) | |
1357 | { | |
1358 | gfn_t gfn = gpa >> PAGE_SHIFT; | |
1359 | int seg; | |
1360 | int offset = offset_in_page(gpa); | |
1361 | int ret; | |
1362 | ||
1363 | while ((seg = next_segment(len, offset)) != 0) { | |
1364 | ret = kvm_write_guest_page(kvm, gfn, data, offset, seg); | |
1365 | if (ret < 0) | |
1366 | return ret; | |
1367 | offset = 0; | |
1368 | len -= seg; | |
1369 | data += seg; | |
1370 | ++gfn; | |
1371 | } | |
1372 | return 0; | |
1373 | } | |
1374 | ||
49c7754c GN |
1375 | int kvm_gfn_to_hva_cache_init(struct kvm *kvm, struct gfn_to_hva_cache *ghc, |
1376 | gpa_t gpa) | |
1377 | { | |
1378 | struct kvm_memslots *slots = kvm_memslots(kvm); | |
1379 | int offset = offset_in_page(gpa); | |
1380 | gfn_t gfn = gpa >> PAGE_SHIFT; | |
1381 | ||
1382 | ghc->gpa = gpa; | |
1383 | ghc->generation = slots->generation; | |
1384 | ghc->memslot = __gfn_to_memslot(slots, gfn); | |
1385 | ghc->hva = gfn_to_hva_many(ghc->memslot, gfn, NULL); | |
1386 | if (!kvm_is_error_hva(ghc->hva)) | |
1387 | ghc->hva += offset; | |
1388 | else | |
1389 | return -EFAULT; | |
1390 | ||
1391 | return 0; | |
1392 | } | |
1393 | EXPORT_SYMBOL_GPL(kvm_gfn_to_hva_cache_init); | |
1394 | ||
1395 | int kvm_write_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc, | |
1396 | void *data, unsigned long len) | |
1397 | { | |
1398 | struct kvm_memslots *slots = kvm_memslots(kvm); | |
1399 | int r; | |
1400 | ||
1401 | if (slots->generation != ghc->generation) | |
1402 | kvm_gfn_to_hva_cache_init(kvm, ghc, ghc->gpa); | |
1403 | ||
1404 | if (kvm_is_error_hva(ghc->hva)) | |
1405 | return -EFAULT; | |
1406 | ||
1407 | r = copy_to_user((void __user *)ghc->hva, data, len); | |
1408 | if (r) | |
1409 | return -EFAULT; | |
1410 | mark_page_dirty_in_slot(kvm, ghc->memslot, ghc->gpa >> PAGE_SHIFT); | |
1411 | ||
1412 | return 0; | |
1413 | } | |
1414 | EXPORT_SYMBOL_GPL(kvm_write_guest_cached); | |
1415 | ||
195aefde IE |
1416 | int kvm_clear_guest_page(struct kvm *kvm, gfn_t gfn, int offset, int len) |
1417 | { | |
3bcc8a8c HC |
1418 | return kvm_write_guest_page(kvm, gfn, (const void *) empty_zero_page, |
1419 | offset, len); | |
195aefde IE |
1420 | } |
1421 | EXPORT_SYMBOL_GPL(kvm_clear_guest_page); | |
1422 | ||
1423 | int kvm_clear_guest(struct kvm *kvm, gpa_t gpa, unsigned long len) | |
1424 | { | |
1425 | gfn_t gfn = gpa >> PAGE_SHIFT; | |
1426 | int seg; | |
1427 | int offset = offset_in_page(gpa); | |
1428 | int ret; | |
1429 | ||
1430 | while ((seg = next_segment(len, offset)) != 0) { | |
1431 | ret = kvm_clear_guest_page(kvm, gfn, offset, seg); | |
1432 | if (ret < 0) | |
1433 | return ret; | |
1434 | offset = 0; | |
1435 | len -= seg; | |
1436 | ++gfn; | |
1437 | } | |
1438 | return 0; | |
1439 | } | |
1440 | EXPORT_SYMBOL_GPL(kvm_clear_guest); | |
1441 | ||
49c7754c GN |
1442 | void mark_page_dirty_in_slot(struct kvm *kvm, struct kvm_memory_slot *memslot, |
1443 | gfn_t gfn) | |
6aa8b732 | 1444 | { |
7e9d619d RR |
1445 | if (memslot && memslot->dirty_bitmap) { |
1446 | unsigned long rel_gfn = gfn - memslot->base_gfn; | |
6aa8b732 | 1447 | |
cd7e48c5 | 1448 | __set_bit_le(rel_gfn, memslot->dirty_bitmap); |
6aa8b732 AK |
1449 | } |
1450 | } | |
1451 | ||
49c7754c GN |
1452 | void mark_page_dirty(struct kvm *kvm, gfn_t gfn) |
1453 | { | |
1454 | struct kvm_memory_slot *memslot; | |
1455 | ||
1456 | memslot = gfn_to_memslot(kvm, gfn); | |
1457 | mark_page_dirty_in_slot(kvm, memslot, gfn); | |
1458 | } | |
1459 | ||
b6958ce4 ED |
1460 | /* |
1461 | * The vCPU has executed a HLT instruction with in-kernel mode enabled. | |
1462 | */ | |
8776e519 | 1463 | void kvm_vcpu_block(struct kvm_vcpu *vcpu) |
d3bef15f | 1464 | { |
e5c239cf MT |
1465 | DEFINE_WAIT(wait); |
1466 | ||
1467 | for (;;) { | |
1468 | prepare_to_wait(&vcpu->wq, &wait, TASK_INTERRUPTIBLE); | |
1469 | ||
a1b37100 | 1470 | if (kvm_arch_vcpu_runnable(vcpu)) { |
a8eeb04a | 1471 | kvm_make_request(KVM_REQ_UNHALT, vcpu); |
e5c239cf | 1472 | break; |
d7690175 | 1473 | } |
09cec754 GN |
1474 | if (kvm_cpu_has_pending_timer(vcpu)) |
1475 | break; | |
e5c239cf MT |
1476 | if (signal_pending(current)) |
1477 | break; | |
1478 | ||
b6958ce4 | 1479 | schedule(); |
b6958ce4 | 1480 | } |
d3bef15f | 1481 | |
e5c239cf | 1482 | finish_wait(&vcpu->wq, &wait); |
b6958ce4 ED |
1483 | } |
1484 | ||
6aa8b732 AK |
1485 | void kvm_resched(struct kvm_vcpu *vcpu) |
1486 | { | |
3fca0365 YD |
1487 | if (!need_resched()) |
1488 | return; | |
6aa8b732 | 1489 | cond_resched(); |
6aa8b732 AK |
1490 | } |
1491 | EXPORT_SYMBOL_GPL(kvm_resched); | |
1492 | ||
217ece61 | 1493 | void kvm_vcpu_on_spin(struct kvm_vcpu *me) |
d255f4f2 | 1494 | { |
217ece61 RR |
1495 | struct kvm *kvm = me->kvm; |
1496 | struct kvm_vcpu *vcpu; | |
1497 | int last_boosted_vcpu = me->kvm->last_boosted_vcpu; | |
1498 | int yielded = 0; | |
1499 | int pass; | |
1500 | int i; | |
d255f4f2 | 1501 | |
217ece61 RR |
1502 | /* |
1503 | * We boost the priority of a VCPU that is runnable but not | |
1504 | * currently running, because it got preempted by something | |
1505 | * else and called schedule in __vcpu_run. Hopefully that | |
1506 | * VCPU is holding the lock that we need and will release it. | |
1507 | * We approximate round-robin by starting at the last boosted VCPU. | |
1508 | */ | |
1509 | for (pass = 0; pass < 2 && !yielded; pass++) { | |
1510 | kvm_for_each_vcpu(i, vcpu, kvm) { | |
1511 | struct task_struct *task = NULL; | |
1512 | struct pid *pid; | |
1513 | if (!pass && i < last_boosted_vcpu) { | |
1514 | i = last_boosted_vcpu; | |
1515 | continue; | |
1516 | } else if (pass && i > last_boosted_vcpu) | |
1517 | break; | |
1518 | if (vcpu == me) | |
1519 | continue; | |
1520 | if (waitqueue_active(&vcpu->wq)) | |
1521 | continue; | |
1522 | rcu_read_lock(); | |
1523 | pid = rcu_dereference(vcpu->pid); | |
1524 | if (pid) | |
1525 | task = get_pid_task(vcpu->pid, PIDTYPE_PID); | |
1526 | rcu_read_unlock(); | |
1527 | if (!task) | |
1528 | continue; | |
1529 | if (task->flags & PF_VCPU) { | |
1530 | put_task_struct(task); | |
1531 | continue; | |
1532 | } | |
1533 | if (yield_to(task, 1)) { | |
1534 | put_task_struct(task); | |
1535 | kvm->last_boosted_vcpu = i; | |
1536 | yielded = 1; | |
1537 | break; | |
1538 | } | |
1539 | put_task_struct(task); | |
1540 | } | |
1541 | } | |
d255f4f2 ZE |
1542 | } |
1543 | EXPORT_SYMBOL_GPL(kvm_vcpu_on_spin); | |
1544 | ||
e4a533a4 | 1545 | static int kvm_vcpu_fault(struct vm_area_struct *vma, struct vm_fault *vmf) |
9a2bb7f4 AK |
1546 | { |
1547 | struct kvm_vcpu *vcpu = vma->vm_file->private_data; | |
9a2bb7f4 AK |
1548 | struct page *page; |
1549 | ||
e4a533a4 | 1550 | if (vmf->pgoff == 0) |
039576c0 | 1551 | page = virt_to_page(vcpu->run); |
09566765 | 1552 | #ifdef CONFIG_X86 |
e4a533a4 | 1553 | else if (vmf->pgoff == KVM_PIO_PAGE_OFFSET) |
ad312c7c | 1554 | page = virt_to_page(vcpu->arch.pio_data); |
5f94c174 LV |
1555 | #endif |
1556 | #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET | |
1557 | else if (vmf->pgoff == KVM_COALESCED_MMIO_PAGE_OFFSET) | |
1558 | page = virt_to_page(vcpu->kvm->coalesced_mmio_ring); | |
09566765 | 1559 | #endif |
039576c0 | 1560 | else |
e4a533a4 | 1561 | return VM_FAULT_SIGBUS; |
9a2bb7f4 | 1562 | get_page(page); |
e4a533a4 | 1563 | vmf->page = page; |
1564 | return 0; | |
9a2bb7f4 AK |
1565 | } |
1566 | ||
f0f37e2f | 1567 | static const struct vm_operations_struct kvm_vcpu_vm_ops = { |
e4a533a4 | 1568 | .fault = kvm_vcpu_fault, |
9a2bb7f4 AK |
1569 | }; |
1570 | ||
1571 | static int kvm_vcpu_mmap(struct file *file, struct vm_area_struct *vma) | |
1572 | { | |
1573 | vma->vm_ops = &kvm_vcpu_vm_ops; | |
1574 | return 0; | |
1575 | } | |
1576 | ||
bccf2150 AK |
1577 | static int kvm_vcpu_release(struct inode *inode, struct file *filp) |
1578 | { | |
1579 | struct kvm_vcpu *vcpu = filp->private_data; | |
1580 | ||
66c0b394 | 1581 | kvm_put_kvm(vcpu->kvm); |
bccf2150 AK |
1582 | return 0; |
1583 | } | |
1584 | ||
3d3aab1b | 1585 | static struct file_operations kvm_vcpu_fops = { |
bccf2150 AK |
1586 | .release = kvm_vcpu_release, |
1587 | .unlocked_ioctl = kvm_vcpu_ioctl, | |
1588 | .compat_ioctl = kvm_vcpu_ioctl, | |
9a2bb7f4 | 1589 | .mmap = kvm_vcpu_mmap, |
6038f373 | 1590 | .llseek = noop_llseek, |
bccf2150 AK |
1591 | }; |
1592 | ||
1593 | /* | |
1594 | * Allocates an inode for the vcpu. | |
1595 | */ | |
1596 | static int create_vcpu_fd(struct kvm_vcpu *vcpu) | |
1597 | { | |
628ff7c1 | 1598 | return anon_inode_getfd("kvm-vcpu", &kvm_vcpu_fops, vcpu, O_RDWR); |
bccf2150 AK |
1599 | } |
1600 | ||
c5ea7660 AK |
1601 | /* |
1602 | * Creates some virtual cpus. Good luck creating more than one. | |
1603 | */ | |
73880c80 | 1604 | static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, u32 id) |
c5ea7660 AK |
1605 | { |
1606 | int r; | |
988a2cae | 1607 | struct kvm_vcpu *vcpu, *v; |
c5ea7660 | 1608 | |
73880c80 | 1609 | vcpu = kvm_arch_vcpu_create(kvm, id); |
fb3f0f51 RR |
1610 | if (IS_ERR(vcpu)) |
1611 | return PTR_ERR(vcpu); | |
c5ea7660 | 1612 | |
15ad7146 AK |
1613 | preempt_notifier_init(&vcpu->preempt_notifier, &kvm_preempt_ops); |
1614 | ||
26e5215f AK |
1615 | r = kvm_arch_vcpu_setup(vcpu); |
1616 | if (r) | |
7d8fece6 | 1617 | return r; |
26e5215f | 1618 | |
11ec2804 | 1619 | mutex_lock(&kvm->lock); |
73880c80 GN |
1620 | if (atomic_read(&kvm->online_vcpus) == KVM_MAX_VCPUS) { |
1621 | r = -EINVAL; | |
e9b11c17 | 1622 | goto vcpu_destroy; |
fb3f0f51 | 1623 | } |
73880c80 | 1624 | |
988a2cae GN |
1625 | kvm_for_each_vcpu(r, v, kvm) |
1626 | if (v->vcpu_id == id) { | |
73880c80 GN |
1627 | r = -EEXIST; |
1628 | goto vcpu_destroy; | |
1629 | } | |
1630 | ||
1631 | BUG_ON(kvm->vcpus[atomic_read(&kvm->online_vcpus)]); | |
c5ea7660 | 1632 | |
fb3f0f51 | 1633 | /* Now it's all set up, let userspace reach it */ |
66c0b394 | 1634 | kvm_get_kvm(kvm); |
bccf2150 | 1635 | r = create_vcpu_fd(vcpu); |
73880c80 GN |
1636 | if (r < 0) { |
1637 | kvm_put_kvm(kvm); | |
1638 | goto vcpu_destroy; | |
1639 | } | |
1640 | ||
1641 | kvm->vcpus[atomic_read(&kvm->online_vcpus)] = vcpu; | |
1642 | smp_wmb(); | |
1643 | atomic_inc(&kvm->online_vcpus); | |
1644 | ||
1645 | #ifdef CONFIG_KVM_APIC_ARCHITECTURE | |
1646 | if (kvm->bsp_vcpu_id == id) | |
1647 | kvm->bsp_vcpu = vcpu; | |
1648 | #endif | |
1649 | mutex_unlock(&kvm->lock); | |
fb3f0f51 | 1650 | return r; |
39c3b86e | 1651 | |
e9b11c17 | 1652 | vcpu_destroy: |
7d8fece6 | 1653 | mutex_unlock(&kvm->lock); |
d40ccc62 | 1654 | kvm_arch_vcpu_destroy(vcpu); |
c5ea7660 AK |
1655 | return r; |
1656 | } | |
1657 | ||
1961d276 AK |
1658 | static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu *vcpu, sigset_t *sigset) |
1659 | { | |
1660 | if (sigset) { | |
1661 | sigdelsetmask(sigset, sigmask(SIGKILL)|sigmask(SIGSTOP)); | |
1662 | vcpu->sigset_active = 1; | |
1663 | vcpu->sigset = *sigset; | |
1664 | } else | |
1665 | vcpu->sigset_active = 0; | |
1666 | return 0; | |
1667 | } | |
1668 | ||
bccf2150 AK |
1669 | static long kvm_vcpu_ioctl(struct file *filp, |
1670 | unsigned int ioctl, unsigned long arg) | |
6aa8b732 | 1671 | { |
bccf2150 | 1672 | struct kvm_vcpu *vcpu = filp->private_data; |
2f366987 | 1673 | void __user *argp = (void __user *)arg; |
313a3dc7 | 1674 | int r; |
fa3795a7 DH |
1675 | struct kvm_fpu *fpu = NULL; |
1676 | struct kvm_sregs *kvm_sregs = NULL; | |
6aa8b732 | 1677 | |
6d4e4c4f AK |
1678 | if (vcpu->kvm->mm != current->mm) |
1679 | return -EIO; | |
2122ff5e AK |
1680 | |
1681 | #if defined(CONFIG_S390) || defined(CONFIG_PPC) | |
1682 | /* | |
1683 | * Special cases: vcpu ioctls that are asynchronous to vcpu execution, | |
1684 | * so vcpu_load() would break it. | |
1685 | */ | |
1686 | if (ioctl == KVM_S390_INTERRUPT || ioctl == KVM_INTERRUPT) | |
1687 | return kvm_arch_vcpu_ioctl(filp, ioctl, arg); | |
1688 | #endif | |
1689 | ||
1690 | ||
1691 | vcpu_load(vcpu); | |
6aa8b732 | 1692 | switch (ioctl) { |
9a2bb7f4 | 1693 | case KVM_RUN: |
f0fe5108 AK |
1694 | r = -EINVAL; |
1695 | if (arg) | |
1696 | goto out; | |
b6c7a5dc | 1697 | r = kvm_arch_vcpu_ioctl_run(vcpu, vcpu->run); |
64be5007 | 1698 | trace_kvm_userspace_exit(vcpu->run->exit_reason, r); |
6aa8b732 | 1699 | break; |
6aa8b732 | 1700 | case KVM_GET_REGS: { |
3e4bb3ac | 1701 | struct kvm_regs *kvm_regs; |
6aa8b732 | 1702 | |
3e4bb3ac XZ |
1703 | r = -ENOMEM; |
1704 | kvm_regs = kzalloc(sizeof(struct kvm_regs), GFP_KERNEL); | |
1705 | if (!kvm_regs) | |
6aa8b732 | 1706 | goto out; |
3e4bb3ac XZ |
1707 | r = kvm_arch_vcpu_ioctl_get_regs(vcpu, kvm_regs); |
1708 | if (r) | |
1709 | goto out_free1; | |
6aa8b732 | 1710 | r = -EFAULT; |
3e4bb3ac XZ |
1711 | if (copy_to_user(argp, kvm_regs, sizeof(struct kvm_regs))) |
1712 | goto out_free1; | |
6aa8b732 | 1713 | r = 0; |
3e4bb3ac XZ |
1714 | out_free1: |
1715 | kfree(kvm_regs); | |
6aa8b732 AK |
1716 | break; |
1717 | } | |
1718 | case KVM_SET_REGS: { | |
3e4bb3ac | 1719 | struct kvm_regs *kvm_regs; |
6aa8b732 | 1720 | |
3e4bb3ac XZ |
1721 | r = -ENOMEM; |
1722 | kvm_regs = kzalloc(sizeof(struct kvm_regs), GFP_KERNEL); | |
1723 | if (!kvm_regs) | |
6aa8b732 | 1724 | goto out; |
3e4bb3ac XZ |
1725 | r = -EFAULT; |
1726 | if (copy_from_user(kvm_regs, argp, sizeof(struct kvm_regs))) | |
1727 | goto out_free2; | |
1728 | r = kvm_arch_vcpu_ioctl_set_regs(vcpu, kvm_regs); | |
6aa8b732 | 1729 | if (r) |
3e4bb3ac | 1730 | goto out_free2; |
6aa8b732 | 1731 | r = 0; |
3e4bb3ac XZ |
1732 | out_free2: |
1733 | kfree(kvm_regs); | |
6aa8b732 AK |
1734 | break; |
1735 | } | |
1736 | case KVM_GET_SREGS: { | |
fa3795a7 DH |
1737 | kvm_sregs = kzalloc(sizeof(struct kvm_sregs), GFP_KERNEL); |
1738 | r = -ENOMEM; | |
1739 | if (!kvm_sregs) | |
1740 | goto out; | |
1741 | r = kvm_arch_vcpu_ioctl_get_sregs(vcpu, kvm_sregs); | |
6aa8b732 AK |
1742 | if (r) |
1743 | goto out; | |
1744 | r = -EFAULT; | |
fa3795a7 | 1745 | if (copy_to_user(argp, kvm_sregs, sizeof(struct kvm_sregs))) |
6aa8b732 AK |
1746 | goto out; |
1747 | r = 0; | |
1748 | break; | |
1749 | } | |
1750 | case KVM_SET_SREGS: { | |
fa3795a7 DH |
1751 | kvm_sregs = kmalloc(sizeof(struct kvm_sregs), GFP_KERNEL); |
1752 | r = -ENOMEM; | |
1753 | if (!kvm_sregs) | |
1754 | goto out; | |
6aa8b732 | 1755 | r = -EFAULT; |
fa3795a7 | 1756 | if (copy_from_user(kvm_sregs, argp, sizeof(struct kvm_sregs))) |
6aa8b732 | 1757 | goto out; |
fa3795a7 | 1758 | r = kvm_arch_vcpu_ioctl_set_sregs(vcpu, kvm_sregs); |
6aa8b732 AK |
1759 | if (r) |
1760 | goto out; | |
1761 | r = 0; | |
1762 | break; | |
1763 | } | |
62d9f0db MT |
1764 | case KVM_GET_MP_STATE: { |
1765 | struct kvm_mp_state mp_state; | |
1766 | ||
1767 | r = kvm_arch_vcpu_ioctl_get_mpstate(vcpu, &mp_state); | |
1768 | if (r) | |
1769 | goto out; | |
1770 | r = -EFAULT; | |
1771 | if (copy_to_user(argp, &mp_state, sizeof mp_state)) | |
1772 | goto out; | |
1773 | r = 0; | |
1774 | break; | |
1775 | } | |
1776 | case KVM_SET_MP_STATE: { | |
1777 | struct kvm_mp_state mp_state; | |
1778 | ||
1779 | r = -EFAULT; | |
1780 | if (copy_from_user(&mp_state, argp, sizeof mp_state)) | |
1781 | goto out; | |
1782 | r = kvm_arch_vcpu_ioctl_set_mpstate(vcpu, &mp_state); | |
1783 | if (r) | |
1784 | goto out; | |
1785 | r = 0; | |
1786 | break; | |
1787 | } | |
6aa8b732 AK |
1788 | case KVM_TRANSLATE: { |
1789 | struct kvm_translation tr; | |
1790 | ||
1791 | r = -EFAULT; | |
2f366987 | 1792 | if (copy_from_user(&tr, argp, sizeof tr)) |
6aa8b732 | 1793 | goto out; |
8b006791 | 1794 | r = kvm_arch_vcpu_ioctl_translate(vcpu, &tr); |
6aa8b732 AK |
1795 | if (r) |
1796 | goto out; | |
1797 | r = -EFAULT; | |
2f366987 | 1798 | if (copy_to_user(argp, &tr, sizeof tr)) |
6aa8b732 AK |
1799 | goto out; |
1800 | r = 0; | |
1801 | break; | |
1802 | } | |
d0bfb940 JK |
1803 | case KVM_SET_GUEST_DEBUG: { |
1804 | struct kvm_guest_debug dbg; | |
6aa8b732 AK |
1805 | |
1806 | r = -EFAULT; | |
2f366987 | 1807 | if (copy_from_user(&dbg, argp, sizeof dbg)) |
6aa8b732 | 1808 | goto out; |
d0bfb940 | 1809 | r = kvm_arch_vcpu_ioctl_set_guest_debug(vcpu, &dbg); |
6aa8b732 AK |
1810 | if (r) |
1811 | goto out; | |
1812 | r = 0; | |
1813 | break; | |
1814 | } | |
1961d276 AK |
1815 | case KVM_SET_SIGNAL_MASK: { |
1816 | struct kvm_signal_mask __user *sigmask_arg = argp; | |
1817 | struct kvm_signal_mask kvm_sigmask; | |
1818 | sigset_t sigset, *p; | |
1819 | ||
1820 | p = NULL; | |
1821 | if (argp) { | |
1822 | r = -EFAULT; | |
1823 | if (copy_from_user(&kvm_sigmask, argp, | |
1824 | sizeof kvm_sigmask)) | |
1825 | goto out; | |
1826 | r = -EINVAL; | |
1827 | if (kvm_sigmask.len != sizeof sigset) | |
1828 | goto out; | |
1829 | r = -EFAULT; | |
1830 | if (copy_from_user(&sigset, sigmask_arg->sigset, | |
1831 | sizeof sigset)) | |
1832 | goto out; | |
1833 | p = &sigset; | |
1834 | } | |
376d41ff | 1835 | r = kvm_vcpu_ioctl_set_sigmask(vcpu, p); |
1961d276 AK |
1836 | break; |
1837 | } | |
b8836737 | 1838 | case KVM_GET_FPU: { |
fa3795a7 DH |
1839 | fpu = kzalloc(sizeof(struct kvm_fpu), GFP_KERNEL); |
1840 | r = -ENOMEM; | |
1841 | if (!fpu) | |
1842 | goto out; | |
1843 | r = kvm_arch_vcpu_ioctl_get_fpu(vcpu, fpu); | |
b8836737 AK |
1844 | if (r) |
1845 | goto out; | |
1846 | r = -EFAULT; | |
fa3795a7 | 1847 | if (copy_to_user(argp, fpu, sizeof(struct kvm_fpu))) |
b8836737 AK |
1848 | goto out; |
1849 | r = 0; | |
1850 | break; | |
1851 | } | |
1852 | case KVM_SET_FPU: { | |
fa3795a7 DH |
1853 | fpu = kmalloc(sizeof(struct kvm_fpu), GFP_KERNEL); |
1854 | r = -ENOMEM; | |
1855 | if (!fpu) | |
1856 | goto out; | |
b8836737 | 1857 | r = -EFAULT; |
fa3795a7 | 1858 | if (copy_from_user(fpu, argp, sizeof(struct kvm_fpu))) |
b8836737 | 1859 | goto out; |
fa3795a7 | 1860 | r = kvm_arch_vcpu_ioctl_set_fpu(vcpu, fpu); |
b8836737 AK |
1861 | if (r) |
1862 | goto out; | |
1863 | r = 0; | |
1864 | break; | |
1865 | } | |
bccf2150 | 1866 | default: |
313a3dc7 | 1867 | r = kvm_arch_vcpu_ioctl(filp, ioctl, arg); |
bccf2150 AK |
1868 | } |
1869 | out: | |
2122ff5e | 1870 | vcpu_put(vcpu); |
fa3795a7 DH |
1871 | kfree(fpu); |
1872 | kfree(kvm_sregs); | |
bccf2150 AK |
1873 | return r; |
1874 | } | |
1875 | ||
1876 | static long kvm_vm_ioctl(struct file *filp, | |
1877 | unsigned int ioctl, unsigned long arg) | |
1878 | { | |
1879 | struct kvm *kvm = filp->private_data; | |
1880 | void __user *argp = (void __user *)arg; | |
1fe779f8 | 1881 | int r; |
bccf2150 | 1882 | |
6d4e4c4f AK |
1883 | if (kvm->mm != current->mm) |
1884 | return -EIO; | |
bccf2150 AK |
1885 | switch (ioctl) { |
1886 | case KVM_CREATE_VCPU: | |
1887 | r = kvm_vm_ioctl_create_vcpu(kvm, arg); | |
1888 | if (r < 0) | |
1889 | goto out; | |
1890 | break; | |
6fc138d2 IE |
1891 | case KVM_SET_USER_MEMORY_REGION: { |
1892 | struct kvm_userspace_memory_region kvm_userspace_mem; | |
1893 | ||
1894 | r = -EFAULT; | |
1895 | if (copy_from_user(&kvm_userspace_mem, argp, | |
1896 | sizeof kvm_userspace_mem)) | |
1897 | goto out; | |
1898 | ||
1899 | r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_userspace_mem, 1); | |
6aa8b732 AK |
1900 | if (r) |
1901 | goto out; | |
1902 | break; | |
1903 | } | |
1904 | case KVM_GET_DIRTY_LOG: { | |
1905 | struct kvm_dirty_log log; | |
1906 | ||
1907 | r = -EFAULT; | |
2f366987 | 1908 | if (copy_from_user(&log, argp, sizeof log)) |
6aa8b732 | 1909 | goto out; |
2c6f5df9 | 1910 | r = kvm_vm_ioctl_get_dirty_log(kvm, &log); |
6aa8b732 AK |
1911 | if (r) |
1912 | goto out; | |
1913 | break; | |
1914 | } | |
5f94c174 LV |
1915 | #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET |
1916 | case KVM_REGISTER_COALESCED_MMIO: { | |
1917 | struct kvm_coalesced_mmio_zone zone; | |
1918 | r = -EFAULT; | |
1919 | if (copy_from_user(&zone, argp, sizeof zone)) | |
1920 | goto out; | |
5f94c174 LV |
1921 | r = kvm_vm_ioctl_register_coalesced_mmio(kvm, &zone); |
1922 | if (r) | |
1923 | goto out; | |
1924 | r = 0; | |
1925 | break; | |
1926 | } | |
1927 | case KVM_UNREGISTER_COALESCED_MMIO: { | |
1928 | struct kvm_coalesced_mmio_zone zone; | |
1929 | r = -EFAULT; | |
1930 | if (copy_from_user(&zone, argp, sizeof zone)) | |
1931 | goto out; | |
5f94c174 LV |
1932 | r = kvm_vm_ioctl_unregister_coalesced_mmio(kvm, &zone); |
1933 | if (r) | |
1934 | goto out; | |
1935 | r = 0; | |
1936 | break; | |
1937 | } | |
1938 | #endif | |
721eecbf GH |
1939 | case KVM_IRQFD: { |
1940 | struct kvm_irqfd data; | |
1941 | ||
1942 | r = -EFAULT; | |
1943 | if (copy_from_user(&data, argp, sizeof data)) | |
1944 | goto out; | |
1945 | r = kvm_irqfd(kvm, data.fd, data.gsi, data.flags); | |
1946 | break; | |
1947 | } | |
d34e6b17 GH |
1948 | case KVM_IOEVENTFD: { |
1949 | struct kvm_ioeventfd data; | |
1950 | ||
1951 | r = -EFAULT; | |
1952 | if (copy_from_user(&data, argp, sizeof data)) | |
1953 | goto out; | |
1954 | r = kvm_ioeventfd(kvm, &data); | |
1955 | break; | |
1956 | } | |
73880c80 GN |
1957 | #ifdef CONFIG_KVM_APIC_ARCHITECTURE |
1958 | case KVM_SET_BOOT_CPU_ID: | |
1959 | r = 0; | |
894a9c55 | 1960 | mutex_lock(&kvm->lock); |
73880c80 GN |
1961 | if (atomic_read(&kvm->online_vcpus) != 0) |
1962 | r = -EBUSY; | |
1963 | else | |
1964 | kvm->bsp_vcpu_id = arg; | |
894a9c55 | 1965 | mutex_unlock(&kvm->lock); |
73880c80 GN |
1966 | break; |
1967 | #endif | |
f17abe9a | 1968 | default: |
1fe779f8 | 1969 | r = kvm_arch_vm_ioctl(filp, ioctl, arg); |
bfd99ff5 AK |
1970 | if (r == -ENOTTY) |
1971 | r = kvm_vm_ioctl_assigned_device(kvm, ioctl, arg); | |
f17abe9a AK |
1972 | } |
1973 | out: | |
1974 | return r; | |
1975 | } | |
1976 | ||
6ff5894c AB |
1977 | #ifdef CONFIG_COMPAT |
1978 | struct compat_kvm_dirty_log { | |
1979 | __u32 slot; | |
1980 | __u32 padding1; | |
1981 | union { | |
1982 | compat_uptr_t dirty_bitmap; /* one bit per page */ | |
1983 | __u64 padding2; | |
1984 | }; | |
1985 | }; | |
1986 | ||
1987 | static long kvm_vm_compat_ioctl(struct file *filp, | |
1988 | unsigned int ioctl, unsigned long arg) | |
1989 | { | |
1990 | struct kvm *kvm = filp->private_data; | |
1991 | int r; | |
1992 | ||
1993 | if (kvm->mm != current->mm) | |
1994 | return -EIO; | |
1995 | switch (ioctl) { | |
1996 | case KVM_GET_DIRTY_LOG: { | |
1997 | struct compat_kvm_dirty_log compat_log; | |
1998 | struct kvm_dirty_log log; | |
1999 | ||
2000 | r = -EFAULT; | |
2001 | if (copy_from_user(&compat_log, (void __user *)arg, | |
2002 | sizeof(compat_log))) | |
2003 | goto out; | |
2004 | log.slot = compat_log.slot; | |
2005 | log.padding1 = compat_log.padding1; | |
2006 | log.padding2 = compat_log.padding2; | |
2007 | log.dirty_bitmap = compat_ptr(compat_log.dirty_bitmap); | |
2008 | ||
2009 | r = kvm_vm_ioctl_get_dirty_log(kvm, &log); | |
2010 | if (r) | |
2011 | goto out; | |
2012 | break; | |
2013 | } | |
2014 | default: | |
2015 | r = kvm_vm_ioctl(filp, ioctl, arg); | |
2016 | } | |
2017 | ||
2018 | out: | |
2019 | return r; | |
2020 | } | |
2021 | #endif | |
2022 | ||
e4a533a4 | 2023 | static int kvm_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf) |
f17abe9a | 2024 | { |
777b3f49 MT |
2025 | struct page *page[1]; |
2026 | unsigned long addr; | |
2027 | int npages; | |
2028 | gfn_t gfn = vmf->pgoff; | |
f17abe9a | 2029 | struct kvm *kvm = vma->vm_file->private_data; |
f17abe9a | 2030 | |
777b3f49 MT |
2031 | addr = gfn_to_hva(kvm, gfn); |
2032 | if (kvm_is_error_hva(addr)) | |
e4a533a4 | 2033 | return VM_FAULT_SIGBUS; |
777b3f49 MT |
2034 | |
2035 | npages = get_user_pages(current, current->mm, addr, 1, 1, 0, page, | |
2036 | NULL); | |
2037 | if (unlikely(npages != 1)) | |
e4a533a4 | 2038 | return VM_FAULT_SIGBUS; |
777b3f49 MT |
2039 | |
2040 | vmf->page = page[0]; | |
e4a533a4 | 2041 | return 0; |
f17abe9a AK |
2042 | } |
2043 | ||
f0f37e2f | 2044 | static const struct vm_operations_struct kvm_vm_vm_ops = { |
e4a533a4 | 2045 | .fault = kvm_vm_fault, |
f17abe9a AK |
2046 | }; |
2047 | ||
2048 | static int kvm_vm_mmap(struct file *file, struct vm_area_struct *vma) | |
2049 | { | |
2050 | vma->vm_ops = &kvm_vm_vm_ops; | |
2051 | return 0; | |
2052 | } | |
2053 | ||
3d3aab1b | 2054 | static struct file_operations kvm_vm_fops = { |
f17abe9a AK |
2055 | .release = kvm_vm_release, |
2056 | .unlocked_ioctl = kvm_vm_ioctl, | |
6ff5894c AB |
2057 | #ifdef CONFIG_COMPAT |
2058 | .compat_ioctl = kvm_vm_compat_ioctl, | |
2059 | #endif | |
f17abe9a | 2060 | .mmap = kvm_vm_mmap, |
6038f373 | 2061 | .llseek = noop_llseek, |
f17abe9a AK |
2062 | }; |
2063 | ||
2064 | static int kvm_dev_ioctl_create_vm(void) | |
2065 | { | |
aac87636 | 2066 | int r; |
f17abe9a AK |
2067 | struct kvm *kvm; |
2068 | ||
f17abe9a | 2069 | kvm = kvm_create_vm(); |
d6d28168 AK |
2070 | if (IS_ERR(kvm)) |
2071 | return PTR_ERR(kvm); | |
6ce5a090 TY |
2072 | #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET |
2073 | r = kvm_coalesced_mmio_init(kvm); | |
2074 | if (r < 0) { | |
2075 | kvm_put_kvm(kvm); | |
2076 | return r; | |
2077 | } | |
2078 | #endif | |
aac87636 HC |
2079 | r = anon_inode_getfd("kvm-vm", &kvm_vm_fops, kvm, O_RDWR); |
2080 | if (r < 0) | |
66c0b394 | 2081 | kvm_put_kvm(kvm); |
f17abe9a | 2082 | |
aac87636 | 2083 | return r; |
f17abe9a AK |
2084 | } |
2085 | ||
1a811b61 AK |
2086 | static long kvm_dev_ioctl_check_extension_generic(long arg) |
2087 | { | |
2088 | switch (arg) { | |
ca9edaee | 2089 | case KVM_CAP_USER_MEMORY: |
1a811b61 | 2090 | case KVM_CAP_DESTROY_MEMORY_REGION_WORKS: |
4cd481f6 | 2091 | case KVM_CAP_JOIN_MEMORY_REGIONS_WORKS: |
73880c80 GN |
2092 | #ifdef CONFIG_KVM_APIC_ARCHITECTURE |
2093 | case KVM_CAP_SET_BOOT_CPU_ID: | |
2094 | #endif | |
a9c7399d | 2095 | case KVM_CAP_INTERNAL_ERROR_DATA: |
1a811b61 | 2096 | return 1; |
399ec807 AK |
2097 | #ifdef CONFIG_HAVE_KVM_IRQCHIP |
2098 | case KVM_CAP_IRQ_ROUTING: | |
36463146 | 2099 | return KVM_MAX_IRQ_ROUTES; |
399ec807 | 2100 | #endif |
1a811b61 AK |
2101 | default: |
2102 | break; | |
2103 | } | |
2104 | return kvm_dev_ioctl_check_extension(arg); | |
2105 | } | |
2106 | ||
f17abe9a AK |
2107 | static long kvm_dev_ioctl(struct file *filp, |
2108 | unsigned int ioctl, unsigned long arg) | |
2109 | { | |
07c45a36 | 2110 | long r = -EINVAL; |
f17abe9a AK |
2111 | |
2112 | switch (ioctl) { | |
2113 | case KVM_GET_API_VERSION: | |
f0fe5108 AK |
2114 | r = -EINVAL; |
2115 | if (arg) | |
2116 | goto out; | |
f17abe9a AK |
2117 | r = KVM_API_VERSION; |
2118 | break; | |
2119 | case KVM_CREATE_VM: | |
f0fe5108 AK |
2120 | r = -EINVAL; |
2121 | if (arg) | |
2122 | goto out; | |
f17abe9a AK |
2123 | r = kvm_dev_ioctl_create_vm(); |
2124 | break; | |
018d00d2 | 2125 | case KVM_CHECK_EXTENSION: |
1a811b61 | 2126 | r = kvm_dev_ioctl_check_extension_generic(arg); |
5d308f45 | 2127 | break; |
07c45a36 AK |
2128 | case KVM_GET_VCPU_MMAP_SIZE: |
2129 | r = -EINVAL; | |
2130 | if (arg) | |
2131 | goto out; | |
adb1ff46 AK |
2132 | r = PAGE_SIZE; /* struct kvm_run */ |
2133 | #ifdef CONFIG_X86 | |
2134 | r += PAGE_SIZE; /* pio data page */ | |
5f94c174 LV |
2135 | #endif |
2136 | #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET | |
2137 | r += PAGE_SIZE; /* coalesced mmio ring page */ | |
adb1ff46 | 2138 | #endif |
07c45a36 | 2139 | break; |
d4c9ff2d FEL |
2140 | case KVM_TRACE_ENABLE: |
2141 | case KVM_TRACE_PAUSE: | |
2142 | case KVM_TRACE_DISABLE: | |
2023a29c | 2143 | r = -EOPNOTSUPP; |
d4c9ff2d | 2144 | break; |
6aa8b732 | 2145 | default: |
043405e1 | 2146 | return kvm_arch_dev_ioctl(filp, ioctl, arg); |
6aa8b732 AK |
2147 | } |
2148 | out: | |
2149 | return r; | |
2150 | } | |
2151 | ||
6aa8b732 | 2152 | static struct file_operations kvm_chardev_ops = { |
6aa8b732 AK |
2153 | .unlocked_ioctl = kvm_dev_ioctl, |
2154 | .compat_ioctl = kvm_dev_ioctl, | |
6038f373 | 2155 | .llseek = noop_llseek, |
6aa8b732 AK |
2156 | }; |
2157 | ||
2158 | static struct miscdevice kvm_dev = { | |
bbe4432e | 2159 | KVM_MINOR, |
6aa8b732 AK |
2160 | "kvm", |
2161 | &kvm_chardev_ops, | |
2162 | }; | |
2163 | ||
75b7127c | 2164 | static void hardware_enable_nolock(void *junk) |
1b6c0168 AK |
2165 | { |
2166 | int cpu = raw_smp_processor_id(); | |
10474ae8 | 2167 | int r; |
1b6c0168 | 2168 | |
7f59f492 | 2169 | if (cpumask_test_cpu(cpu, cpus_hardware_enabled)) |
1b6c0168 | 2170 | return; |
10474ae8 | 2171 | |
7f59f492 | 2172 | cpumask_set_cpu(cpu, cpus_hardware_enabled); |
10474ae8 AG |
2173 | |
2174 | r = kvm_arch_hardware_enable(NULL); | |
2175 | ||
2176 | if (r) { | |
2177 | cpumask_clear_cpu(cpu, cpus_hardware_enabled); | |
2178 | atomic_inc(&hardware_enable_failed); | |
2179 | printk(KERN_INFO "kvm: enabling virtualization on " | |
2180 | "CPU%d failed\n", cpu); | |
2181 | } | |
1b6c0168 AK |
2182 | } |
2183 | ||
75b7127c TY |
2184 | static void hardware_enable(void *junk) |
2185 | { | |
e935b837 | 2186 | raw_spin_lock(&kvm_lock); |
75b7127c | 2187 | hardware_enable_nolock(junk); |
e935b837 | 2188 | raw_spin_unlock(&kvm_lock); |
75b7127c TY |
2189 | } |
2190 | ||
2191 | static void hardware_disable_nolock(void *junk) | |
1b6c0168 AK |
2192 | { |
2193 | int cpu = raw_smp_processor_id(); | |
2194 | ||
7f59f492 | 2195 | if (!cpumask_test_cpu(cpu, cpus_hardware_enabled)) |
1b6c0168 | 2196 | return; |
7f59f492 | 2197 | cpumask_clear_cpu(cpu, cpus_hardware_enabled); |
e9b11c17 | 2198 | kvm_arch_hardware_disable(NULL); |
1b6c0168 AK |
2199 | } |
2200 | ||
75b7127c TY |
2201 | static void hardware_disable(void *junk) |
2202 | { | |
e935b837 | 2203 | raw_spin_lock(&kvm_lock); |
75b7127c | 2204 | hardware_disable_nolock(junk); |
e935b837 | 2205 | raw_spin_unlock(&kvm_lock); |
75b7127c TY |
2206 | } |
2207 | ||
10474ae8 AG |
2208 | static void hardware_disable_all_nolock(void) |
2209 | { | |
2210 | BUG_ON(!kvm_usage_count); | |
2211 | ||
2212 | kvm_usage_count--; | |
2213 | if (!kvm_usage_count) | |
75b7127c | 2214 | on_each_cpu(hardware_disable_nolock, NULL, 1); |
10474ae8 AG |
2215 | } |
2216 | ||
2217 | static void hardware_disable_all(void) | |
2218 | { | |
e935b837 | 2219 | raw_spin_lock(&kvm_lock); |
10474ae8 | 2220 | hardware_disable_all_nolock(); |
e935b837 | 2221 | raw_spin_unlock(&kvm_lock); |
10474ae8 AG |
2222 | } |
2223 | ||
2224 | static int hardware_enable_all(void) | |
2225 | { | |
2226 | int r = 0; | |
2227 | ||
e935b837 | 2228 | raw_spin_lock(&kvm_lock); |
10474ae8 AG |
2229 | |
2230 | kvm_usage_count++; | |
2231 | if (kvm_usage_count == 1) { | |
2232 | atomic_set(&hardware_enable_failed, 0); | |
75b7127c | 2233 | on_each_cpu(hardware_enable_nolock, NULL, 1); |
10474ae8 AG |
2234 | |
2235 | if (atomic_read(&hardware_enable_failed)) { | |
2236 | hardware_disable_all_nolock(); | |
2237 | r = -EBUSY; | |
2238 | } | |
2239 | } | |
2240 | ||
e935b837 | 2241 | raw_spin_unlock(&kvm_lock); |
10474ae8 AG |
2242 | |
2243 | return r; | |
2244 | } | |
2245 | ||
774c47f1 AK |
2246 | static int kvm_cpu_hotplug(struct notifier_block *notifier, unsigned long val, |
2247 | void *v) | |
2248 | { | |
2249 | int cpu = (long)v; | |
2250 | ||
10474ae8 AG |
2251 | if (!kvm_usage_count) |
2252 | return NOTIFY_OK; | |
2253 | ||
1a6f4d7f | 2254 | val &= ~CPU_TASKS_FROZEN; |
774c47f1 | 2255 | switch (val) { |
cec9ad27 | 2256 | case CPU_DYING: |
6ec8a856 AK |
2257 | printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n", |
2258 | cpu); | |
2259 | hardware_disable(NULL); | |
2260 | break; | |
da908f2f | 2261 | case CPU_STARTING: |
43934a38 JK |
2262 | printk(KERN_INFO "kvm: enabling virtualization on CPU%d\n", |
2263 | cpu); | |
da908f2f | 2264 | hardware_enable(NULL); |
774c47f1 AK |
2265 | break; |
2266 | } | |
2267 | return NOTIFY_OK; | |
2268 | } | |
2269 | ||
4ecac3fd | 2270 | |
b7c4145b | 2271 | asmlinkage void kvm_spurious_fault(void) |
4ecac3fd | 2272 | { |
4ecac3fd AK |
2273 | /* Fault while not rebooting. We want the trace. */ |
2274 | BUG(); | |
2275 | } | |
b7c4145b | 2276 | EXPORT_SYMBOL_GPL(kvm_spurious_fault); |
4ecac3fd | 2277 | |
9a2b85c6 | 2278 | static int kvm_reboot(struct notifier_block *notifier, unsigned long val, |
d77c26fc | 2279 | void *v) |
9a2b85c6 | 2280 | { |
8e1c1815 SY |
2281 | /* |
2282 | * Some (well, at least mine) BIOSes hang on reboot if | |
2283 | * in vmx root mode. | |
2284 | * | |
2285 | * And Intel TXT required VMX off for all cpu when system shutdown. | |
2286 | */ | |
2287 | printk(KERN_INFO "kvm: exiting hardware virtualization\n"); | |
2288 | kvm_rebooting = true; | |
75b7127c | 2289 | on_each_cpu(hardware_disable_nolock, NULL, 1); |
9a2b85c6 RR |
2290 | return NOTIFY_OK; |
2291 | } | |
2292 | ||
2293 | static struct notifier_block kvm_reboot_notifier = { | |
2294 | .notifier_call = kvm_reboot, | |
2295 | .priority = 0, | |
2296 | }; | |
2297 | ||
e93f8a0f | 2298 | static void kvm_io_bus_destroy(struct kvm_io_bus *bus) |
2eeb2e94 GH |
2299 | { |
2300 | int i; | |
2301 | ||
2302 | for (i = 0; i < bus->dev_count; i++) { | |
2303 | struct kvm_io_device *pos = bus->devs[i]; | |
2304 | ||
2305 | kvm_iodevice_destructor(pos); | |
2306 | } | |
e93f8a0f | 2307 | kfree(bus); |
2eeb2e94 GH |
2308 | } |
2309 | ||
bda9020e | 2310 | /* kvm_io_bus_write - called under kvm->slots_lock */ |
e93f8a0f | 2311 | int kvm_io_bus_write(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr, |
bda9020e | 2312 | int len, const void *val) |
2eeb2e94 GH |
2313 | { |
2314 | int i; | |
90d83dc3 LJ |
2315 | struct kvm_io_bus *bus; |
2316 | ||
2317 | bus = srcu_dereference(kvm->buses[bus_idx], &kvm->srcu); | |
bda9020e MT |
2318 | for (i = 0; i < bus->dev_count; i++) |
2319 | if (!kvm_iodevice_write(bus->devs[i], addr, len, val)) | |
2320 | return 0; | |
2321 | return -EOPNOTSUPP; | |
2322 | } | |
2eeb2e94 | 2323 | |
bda9020e | 2324 | /* kvm_io_bus_read - called under kvm->slots_lock */ |
e93f8a0f MT |
2325 | int kvm_io_bus_read(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr, |
2326 | int len, void *val) | |
bda9020e MT |
2327 | { |
2328 | int i; | |
90d83dc3 | 2329 | struct kvm_io_bus *bus; |
e93f8a0f | 2330 | |
90d83dc3 | 2331 | bus = srcu_dereference(kvm->buses[bus_idx], &kvm->srcu); |
bda9020e MT |
2332 | for (i = 0; i < bus->dev_count; i++) |
2333 | if (!kvm_iodevice_read(bus->devs[i], addr, len, val)) | |
2334 | return 0; | |
2335 | return -EOPNOTSUPP; | |
2eeb2e94 GH |
2336 | } |
2337 | ||
79fac95e | 2338 | /* Caller must hold slots_lock. */ |
e93f8a0f MT |
2339 | int kvm_io_bus_register_dev(struct kvm *kvm, enum kvm_bus bus_idx, |
2340 | struct kvm_io_device *dev) | |
6c474694 | 2341 | { |
e93f8a0f | 2342 | struct kvm_io_bus *new_bus, *bus; |
090b7aff | 2343 | |
e93f8a0f | 2344 | bus = kvm->buses[bus_idx]; |
090b7aff GH |
2345 | if (bus->dev_count > NR_IOBUS_DEVS-1) |
2346 | return -ENOSPC; | |
2eeb2e94 | 2347 | |
e93f8a0f MT |
2348 | new_bus = kzalloc(sizeof(struct kvm_io_bus), GFP_KERNEL); |
2349 | if (!new_bus) | |
2350 | return -ENOMEM; | |
2351 | memcpy(new_bus, bus, sizeof(struct kvm_io_bus)); | |
2352 | new_bus->devs[new_bus->dev_count++] = dev; | |
2353 | rcu_assign_pointer(kvm->buses[bus_idx], new_bus); | |
2354 | synchronize_srcu_expedited(&kvm->srcu); | |
2355 | kfree(bus); | |
090b7aff GH |
2356 | |
2357 | return 0; | |
2358 | } | |
2359 | ||
79fac95e | 2360 | /* Caller must hold slots_lock. */ |
e93f8a0f MT |
2361 | int kvm_io_bus_unregister_dev(struct kvm *kvm, enum kvm_bus bus_idx, |
2362 | struct kvm_io_device *dev) | |
090b7aff | 2363 | { |
e93f8a0f MT |
2364 | int i, r; |
2365 | struct kvm_io_bus *new_bus, *bus; | |
090b7aff | 2366 | |
e93f8a0f MT |
2367 | new_bus = kzalloc(sizeof(struct kvm_io_bus), GFP_KERNEL); |
2368 | if (!new_bus) | |
2369 | return -ENOMEM; | |
090b7aff | 2370 | |
e93f8a0f MT |
2371 | bus = kvm->buses[bus_idx]; |
2372 | memcpy(new_bus, bus, sizeof(struct kvm_io_bus)); | |
2373 | ||
2374 | r = -ENOENT; | |
2375 | for (i = 0; i < new_bus->dev_count; i++) | |
2376 | if (new_bus->devs[i] == dev) { | |
2377 | r = 0; | |
2378 | new_bus->devs[i] = new_bus->devs[--new_bus->dev_count]; | |
090b7aff GH |
2379 | break; |
2380 | } | |
e93f8a0f MT |
2381 | |
2382 | if (r) { | |
2383 | kfree(new_bus); | |
2384 | return r; | |
2385 | } | |
2386 | ||
2387 | rcu_assign_pointer(kvm->buses[bus_idx], new_bus); | |
2388 | synchronize_srcu_expedited(&kvm->srcu); | |
2389 | kfree(bus); | |
2390 | return r; | |
2eeb2e94 GH |
2391 | } |
2392 | ||
774c47f1 AK |
2393 | static struct notifier_block kvm_cpu_notifier = { |
2394 | .notifier_call = kvm_cpu_hotplug, | |
774c47f1 AK |
2395 | }; |
2396 | ||
8b88b099 | 2397 | static int vm_stat_get(void *_offset, u64 *val) |
ba1389b7 AK |
2398 | { |
2399 | unsigned offset = (long)_offset; | |
ba1389b7 AK |
2400 | struct kvm *kvm; |
2401 | ||
8b88b099 | 2402 | *val = 0; |
e935b837 | 2403 | raw_spin_lock(&kvm_lock); |
ba1389b7 | 2404 | list_for_each_entry(kvm, &vm_list, vm_list) |
8b88b099 | 2405 | *val += *(u32 *)((void *)kvm + offset); |
e935b837 | 2406 | raw_spin_unlock(&kvm_lock); |
8b88b099 | 2407 | return 0; |
ba1389b7 AK |
2408 | } |
2409 | ||
2410 | DEFINE_SIMPLE_ATTRIBUTE(vm_stat_fops, vm_stat_get, NULL, "%llu\n"); | |
2411 | ||
8b88b099 | 2412 | static int vcpu_stat_get(void *_offset, u64 *val) |
1165f5fe AK |
2413 | { |
2414 | unsigned offset = (long)_offset; | |
1165f5fe AK |
2415 | struct kvm *kvm; |
2416 | struct kvm_vcpu *vcpu; | |
2417 | int i; | |
2418 | ||
8b88b099 | 2419 | *val = 0; |
e935b837 | 2420 | raw_spin_lock(&kvm_lock); |
1165f5fe | 2421 | list_for_each_entry(kvm, &vm_list, vm_list) |
988a2cae GN |
2422 | kvm_for_each_vcpu(i, vcpu, kvm) |
2423 | *val += *(u32 *)((void *)vcpu + offset); | |
2424 | ||
e935b837 | 2425 | raw_spin_unlock(&kvm_lock); |
8b88b099 | 2426 | return 0; |
1165f5fe AK |
2427 | } |
2428 | ||
ba1389b7 AK |
2429 | DEFINE_SIMPLE_ATTRIBUTE(vcpu_stat_fops, vcpu_stat_get, NULL, "%llu\n"); |
2430 | ||
828c0950 | 2431 | static const struct file_operations *stat_fops[] = { |
ba1389b7 AK |
2432 | [KVM_STAT_VCPU] = &vcpu_stat_fops, |
2433 | [KVM_STAT_VM] = &vm_stat_fops, | |
2434 | }; | |
1165f5fe | 2435 | |
a16b043c | 2436 | static void kvm_init_debug(void) |
6aa8b732 AK |
2437 | { |
2438 | struct kvm_stats_debugfs_item *p; | |
2439 | ||
76f7c879 | 2440 | kvm_debugfs_dir = debugfs_create_dir("kvm", NULL); |
6aa8b732 | 2441 | for (p = debugfs_entries; p->name; ++p) |
76f7c879 | 2442 | p->dentry = debugfs_create_file(p->name, 0444, kvm_debugfs_dir, |
1165f5fe | 2443 | (void *)(long)p->offset, |
ba1389b7 | 2444 | stat_fops[p->kind]); |
6aa8b732 AK |
2445 | } |
2446 | ||
2447 | static void kvm_exit_debug(void) | |
2448 | { | |
2449 | struct kvm_stats_debugfs_item *p; | |
2450 | ||
2451 | for (p = debugfs_entries; p->name; ++p) | |
2452 | debugfs_remove(p->dentry); | |
76f7c879 | 2453 | debugfs_remove(kvm_debugfs_dir); |
6aa8b732 AK |
2454 | } |
2455 | ||
fb3600cc | 2456 | static int kvm_suspend(void) |
59ae6c6b | 2457 | { |
10474ae8 | 2458 | if (kvm_usage_count) |
75b7127c | 2459 | hardware_disable_nolock(NULL); |
59ae6c6b AK |
2460 | return 0; |
2461 | } | |
2462 | ||
fb3600cc | 2463 | static void kvm_resume(void) |
59ae6c6b | 2464 | { |
ca84d1a2 | 2465 | if (kvm_usage_count) { |
e935b837 | 2466 | WARN_ON(raw_spin_is_locked(&kvm_lock)); |
75b7127c | 2467 | hardware_enable_nolock(NULL); |
ca84d1a2 | 2468 | } |
59ae6c6b AK |
2469 | } |
2470 | ||
fb3600cc | 2471 | static struct syscore_ops kvm_syscore_ops = { |
59ae6c6b AK |
2472 | .suspend = kvm_suspend, |
2473 | .resume = kvm_resume, | |
2474 | }; | |
2475 | ||
cea7bb21 | 2476 | struct page *bad_page; |
35149e21 | 2477 | pfn_t bad_pfn; |
6aa8b732 | 2478 | |
15ad7146 AK |
2479 | static inline |
2480 | struct kvm_vcpu *preempt_notifier_to_vcpu(struct preempt_notifier *pn) | |
2481 | { | |
2482 | return container_of(pn, struct kvm_vcpu, preempt_notifier); | |
2483 | } | |
2484 | ||
2485 | static void kvm_sched_in(struct preempt_notifier *pn, int cpu) | |
2486 | { | |
2487 | struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn); | |
2488 | ||
e9b11c17 | 2489 | kvm_arch_vcpu_load(vcpu, cpu); |
15ad7146 AK |
2490 | } |
2491 | ||
2492 | static void kvm_sched_out(struct preempt_notifier *pn, | |
2493 | struct task_struct *next) | |
2494 | { | |
2495 | struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn); | |
2496 | ||
e9b11c17 | 2497 | kvm_arch_vcpu_put(vcpu); |
15ad7146 AK |
2498 | } |
2499 | ||
0ee75bea | 2500 | int kvm_init(void *opaque, unsigned vcpu_size, unsigned vcpu_align, |
c16f862d | 2501 | struct module *module) |
6aa8b732 AK |
2502 | { |
2503 | int r; | |
002c7f7c | 2504 | int cpu; |
6aa8b732 | 2505 | |
f8c16bba ZX |
2506 | r = kvm_arch_init(opaque); |
2507 | if (r) | |
d2308784 | 2508 | goto out_fail; |
cb498ea2 ZX |
2509 | |
2510 | bad_page = alloc_page(GFP_KERNEL | __GFP_ZERO); | |
2511 | ||
2512 | if (bad_page == NULL) { | |
2513 | r = -ENOMEM; | |
2514 | goto out; | |
2515 | } | |
2516 | ||
35149e21 AL |
2517 | bad_pfn = page_to_pfn(bad_page); |
2518 | ||
bf998156 HY |
2519 | hwpoison_page = alloc_page(GFP_KERNEL | __GFP_ZERO); |
2520 | ||
2521 | if (hwpoison_page == NULL) { | |
2522 | r = -ENOMEM; | |
2523 | goto out_free_0; | |
2524 | } | |
2525 | ||
2526 | hwpoison_pfn = page_to_pfn(hwpoison_page); | |
2527 | ||
edba23e5 GN |
2528 | fault_page = alloc_page(GFP_KERNEL | __GFP_ZERO); |
2529 | ||
2530 | if (fault_page == NULL) { | |
2531 | r = -ENOMEM; | |
2532 | goto out_free_0; | |
2533 | } | |
2534 | ||
2535 | fault_pfn = page_to_pfn(fault_page); | |
2536 | ||
8437a617 | 2537 | if (!zalloc_cpumask_var(&cpus_hardware_enabled, GFP_KERNEL)) { |
7f59f492 RR |
2538 | r = -ENOMEM; |
2539 | goto out_free_0; | |
2540 | } | |
2541 | ||
e9b11c17 | 2542 | r = kvm_arch_hardware_setup(); |
6aa8b732 | 2543 | if (r < 0) |
7f59f492 | 2544 | goto out_free_0a; |
6aa8b732 | 2545 | |
002c7f7c YS |
2546 | for_each_online_cpu(cpu) { |
2547 | smp_call_function_single(cpu, | |
e9b11c17 | 2548 | kvm_arch_check_processor_compat, |
8691e5a8 | 2549 | &r, 1); |
002c7f7c | 2550 | if (r < 0) |
d2308784 | 2551 | goto out_free_1; |
002c7f7c YS |
2552 | } |
2553 | ||
774c47f1 AK |
2554 | r = register_cpu_notifier(&kvm_cpu_notifier); |
2555 | if (r) | |
d2308784 | 2556 | goto out_free_2; |
6aa8b732 AK |
2557 | register_reboot_notifier(&kvm_reboot_notifier); |
2558 | ||
c16f862d | 2559 | /* A kmem cache lets us meet the alignment requirements of fx_save. */ |
0ee75bea AK |
2560 | if (!vcpu_align) |
2561 | vcpu_align = __alignof__(struct kvm_vcpu); | |
2562 | kvm_vcpu_cache = kmem_cache_create("kvm_vcpu", vcpu_size, vcpu_align, | |
56919c5c | 2563 | 0, NULL); |
c16f862d RR |
2564 | if (!kvm_vcpu_cache) { |
2565 | r = -ENOMEM; | |
fb3600cc | 2566 | goto out_free_3; |
c16f862d RR |
2567 | } |
2568 | ||
af585b92 GN |
2569 | r = kvm_async_pf_init(); |
2570 | if (r) | |
2571 | goto out_free; | |
2572 | ||
6aa8b732 | 2573 | kvm_chardev_ops.owner = module; |
3d3aab1b CB |
2574 | kvm_vm_fops.owner = module; |
2575 | kvm_vcpu_fops.owner = module; | |
6aa8b732 AK |
2576 | |
2577 | r = misc_register(&kvm_dev); | |
2578 | if (r) { | |
d77c26fc | 2579 | printk(KERN_ERR "kvm: misc device register failed\n"); |
af585b92 | 2580 | goto out_unreg; |
6aa8b732 AK |
2581 | } |
2582 | ||
fb3600cc RW |
2583 | register_syscore_ops(&kvm_syscore_ops); |
2584 | ||
15ad7146 AK |
2585 | kvm_preempt_ops.sched_in = kvm_sched_in; |
2586 | kvm_preempt_ops.sched_out = kvm_sched_out; | |
2587 | ||
0ea4ed8e DW |
2588 | kvm_init_debug(); |
2589 | ||
c7addb90 | 2590 | return 0; |
6aa8b732 | 2591 | |
af585b92 GN |
2592 | out_unreg: |
2593 | kvm_async_pf_deinit(); | |
6aa8b732 | 2594 | out_free: |
c16f862d | 2595 | kmem_cache_destroy(kvm_vcpu_cache); |
d2308784 | 2596 | out_free_3: |
6aa8b732 | 2597 | unregister_reboot_notifier(&kvm_reboot_notifier); |
774c47f1 | 2598 | unregister_cpu_notifier(&kvm_cpu_notifier); |
d2308784 | 2599 | out_free_2: |
d2308784 | 2600 | out_free_1: |
e9b11c17 | 2601 | kvm_arch_hardware_unsetup(); |
7f59f492 RR |
2602 | out_free_0a: |
2603 | free_cpumask_var(cpus_hardware_enabled); | |
d2308784 | 2604 | out_free_0: |
edba23e5 GN |
2605 | if (fault_page) |
2606 | __free_page(fault_page); | |
bf998156 HY |
2607 | if (hwpoison_page) |
2608 | __free_page(hwpoison_page); | |
d2308784 | 2609 | __free_page(bad_page); |
ca45aaae | 2610 | out: |
f8c16bba | 2611 | kvm_arch_exit(); |
d2308784 | 2612 | out_fail: |
6aa8b732 AK |
2613 | return r; |
2614 | } | |
cb498ea2 | 2615 | EXPORT_SYMBOL_GPL(kvm_init); |
6aa8b732 | 2616 | |
cb498ea2 | 2617 | void kvm_exit(void) |
6aa8b732 | 2618 | { |
0ea4ed8e | 2619 | kvm_exit_debug(); |
6aa8b732 | 2620 | misc_deregister(&kvm_dev); |
c16f862d | 2621 | kmem_cache_destroy(kvm_vcpu_cache); |
af585b92 | 2622 | kvm_async_pf_deinit(); |
fb3600cc | 2623 | unregister_syscore_ops(&kvm_syscore_ops); |
6aa8b732 | 2624 | unregister_reboot_notifier(&kvm_reboot_notifier); |
59ae6c6b | 2625 | unregister_cpu_notifier(&kvm_cpu_notifier); |
75b7127c | 2626 | on_each_cpu(hardware_disable_nolock, NULL, 1); |
e9b11c17 | 2627 | kvm_arch_hardware_unsetup(); |
f8c16bba | 2628 | kvm_arch_exit(); |
7f59f492 | 2629 | free_cpumask_var(cpus_hardware_enabled); |
bf998156 | 2630 | __free_page(hwpoison_page); |
cea7bb21 | 2631 | __free_page(bad_page); |
6aa8b732 | 2632 | } |
cb498ea2 | 2633 | EXPORT_SYMBOL_GPL(kvm_exit); |