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Commit | Line | Data |
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6aa8b732 AK |
1 | /* |
2 | * Kernel-based Virtual Machine driver for Linux | |
3 | * | |
4 | * This module enables machines with Intel VT-x extensions to run virtual | |
5 | * machines without emulation or binary translation. | |
6 | * | |
7 | * Copyright (C) 2006 Qumranet, Inc. | |
8 | * | |
9 | * Authors: | |
10 | * Avi Kivity <avi@qumranet.com> | |
11 | * Yaniv Kamay <yaniv@qumranet.com> | |
12 | * | |
13 | * This work is licensed under the terms of the GNU GPL, version 2. See | |
14 | * the COPYING file in the top-level directory. | |
15 | * | |
16 | */ | |
17 | ||
e2174021 | 18 | #include "iodev.h" |
6aa8b732 | 19 | |
edf88417 | 20 | #include <linux/kvm_host.h> |
6aa8b732 AK |
21 | #include <linux/kvm.h> |
22 | #include <linux/module.h> | |
23 | #include <linux/errno.h> | |
6aa8b732 AK |
24 | #include <linux/percpu.h> |
25 | #include <linux/gfp.h> | |
6aa8b732 AK |
26 | #include <linux/mm.h> |
27 | #include <linux/miscdevice.h> | |
28 | #include <linux/vmalloc.h> | |
6aa8b732 | 29 | #include <linux/reboot.h> |
6aa8b732 AK |
30 | #include <linux/debugfs.h> |
31 | #include <linux/highmem.h> | |
32 | #include <linux/file.h> | |
59ae6c6b | 33 | #include <linux/sysdev.h> |
774c47f1 | 34 | #include <linux/cpu.h> |
e8edc6e0 | 35 | #include <linux/sched.h> |
d9e368d6 AK |
36 | #include <linux/cpumask.h> |
37 | #include <linux/smp.h> | |
d6d28168 | 38 | #include <linux/anon_inodes.h> |
04d2cc77 | 39 | #include <linux/profile.h> |
7aa81cc0 | 40 | #include <linux/kvm_para.h> |
6fc138d2 | 41 | #include <linux/pagemap.h> |
8d4e1288 | 42 | #include <linux/mman.h> |
35149e21 | 43 | #include <linux/swap.h> |
6aa8b732 | 44 | |
e495606d | 45 | #include <asm/processor.h> |
e495606d AK |
46 | #include <asm/io.h> |
47 | #include <asm/uaccess.h> | |
3e021bf5 | 48 | #include <asm/pgtable.h> |
6aa8b732 | 49 | |
5f94c174 LV |
50 | #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET |
51 | #include "coalesced_mmio.h" | |
52 | #endif | |
53 | ||
6aa8b732 AK |
54 | MODULE_AUTHOR("Qumranet"); |
55 | MODULE_LICENSE("GPL"); | |
56 | ||
e9b11c17 ZX |
57 | DEFINE_SPINLOCK(kvm_lock); |
58 | LIST_HEAD(vm_list); | |
133de902 | 59 | |
1b6c0168 AK |
60 | static cpumask_t cpus_hardware_enabled; |
61 | ||
c16f862d RR |
62 | struct kmem_cache *kvm_vcpu_cache; |
63 | EXPORT_SYMBOL_GPL(kvm_vcpu_cache); | |
1165f5fe | 64 | |
15ad7146 AK |
65 | static __read_mostly struct preempt_ops kvm_preempt_ops; |
66 | ||
76f7c879 | 67 | struct dentry *kvm_debugfs_dir; |
6aa8b732 | 68 | |
bccf2150 AK |
69 | static long kvm_vcpu_ioctl(struct file *file, unsigned int ioctl, |
70 | unsigned long arg); | |
71 | ||
4ecac3fd AK |
72 | bool kvm_rebooting; |
73 | ||
5aacf0ca JM |
74 | static inline int valid_vcpu(int n) |
75 | { | |
76 | return likely(n >= 0 && n < KVM_MAX_VCPUS); | |
77 | } | |
78 | ||
e5fcfc82 | 79 | static inline int is_mmio_pfn(pfn_t pfn) |
cbff90a7 BAY |
80 | { |
81 | if (pfn_valid(pfn)) | |
82 | return PageReserved(pfn_to_page(pfn)); | |
83 | ||
84 | return true; | |
85 | } | |
86 | ||
bccf2150 AK |
87 | /* |
88 | * Switches to specified vcpu, until a matching vcpu_put() | |
89 | */ | |
313a3dc7 | 90 | void vcpu_load(struct kvm_vcpu *vcpu) |
6aa8b732 | 91 | { |
15ad7146 AK |
92 | int cpu; |
93 | ||
bccf2150 | 94 | mutex_lock(&vcpu->mutex); |
15ad7146 AK |
95 | cpu = get_cpu(); |
96 | preempt_notifier_register(&vcpu->preempt_notifier); | |
313a3dc7 | 97 | kvm_arch_vcpu_load(vcpu, cpu); |
15ad7146 | 98 | put_cpu(); |
6aa8b732 AK |
99 | } |
100 | ||
313a3dc7 | 101 | void vcpu_put(struct kvm_vcpu *vcpu) |
6aa8b732 | 102 | { |
15ad7146 | 103 | preempt_disable(); |
313a3dc7 | 104 | kvm_arch_vcpu_put(vcpu); |
15ad7146 AK |
105 | preempt_notifier_unregister(&vcpu->preempt_notifier); |
106 | preempt_enable(); | |
6aa8b732 AK |
107 | mutex_unlock(&vcpu->mutex); |
108 | } | |
109 | ||
d9e368d6 AK |
110 | static void ack_flush(void *_completed) |
111 | { | |
d9e368d6 AK |
112 | } |
113 | ||
114 | void kvm_flush_remote_tlbs(struct kvm *kvm) | |
115 | { | |
597a5f55 | 116 | int i, cpu, me; |
d9e368d6 AK |
117 | cpumask_t cpus; |
118 | struct kvm_vcpu *vcpu; | |
d9e368d6 | 119 | |
597a5f55 | 120 | me = get_cpu(); |
d9e368d6 | 121 | cpus_clear(cpus); |
fb3f0f51 RR |
122 | for (i = 0; i < KVM_MAX_VCPUS; ++i) { |
123 | vcpu = kvm->vcpus[i]; | |
124 | if (!vcpu) | |
125 | continue; | |
3176bc3e | 126 | if (test_and_set_bit(KVM_REQ_TLB_FLUSH, &vcpu->requests)) |
d9e368d6 AK |
127 | continue; |
128 | cpu = vcpu->cpu; | |
597a5f55 | 129 | if (cpu != -1 && cpu != me) |
49d3bd7e | 130 | cpu_set(cpu, cpus); |
d9e368d6 | 131 | } |
0f74a24c | 132 | if (cpus_empty(cpus)) |
597a5f55 | 133 | goto out; |
0f74a24c | 134 | ++kvm->stat.remote_tlb_flush; |
49d3bd7e | 135 | smp_call_function_mask(cpus, ack_flush, NULL, 1); |
597a5f55 AK |
136 | out: |
137 | put_cpu(); | |
d9e368d6 AK |
138 | } |
139 | ||
2e53d63a MT |
140 | void kvm_reload_remote_mmus(struct kvm *kvm) |
141 | { | |
597a5f55 | 142 | int i, cpu, me; |
2e53d63a MT |
143 | cpumask_t cpus; |
144 | struct kvm_vcpu *vcpu; | |
145 | ||
597a5f55 | 146 | me = get_cpu(); |
2e53d63a MT |
147 | cpus_clear(cpus); |
148 | for (i = 0; i < KVM_MAX_VCPUS; ++i) { | |
149 | vcpu = kvm->vcpus[i]; | |
150 | if (!vcpu) | |
151 | continue; | |
152 | if (test_and_set_bit(KVM_REQ_MMU_RELOAD, &vcpu->requests)) | |
153 | continue; | |
154 | cpu = vcpu->cpu; | |
597a5f55 | 155 | if (cpu != -1 && cpu != me) |
2e53d63a MT |
156 | cpu_set(cpu, cpus); |
157 | } | |
158 | if (cpus_empty(cpus)) | |
597a5f55 | 159 | goto out; |
2e53d63a | 160 | smp_call_function_mask(cpus, ack_flush, NULL, 1); |
597a5f55 AK |
161 | out: |
162 | put_cpu(); | |
2e53d63a MT |
163 | } |
164 | ||
165 | ||
fb3f0f51 RR |
166 | int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id) |
167 | { | |
168 | struct page *page; | |
169 | int r; | |
170 | ||
171 | mutex_init(&vcpu->mutex); | |
172 | vcpu->cpu = -1; | |
fb3f0f51 RR |
173 | vcpu->kvm = kvm; |
174 | vcpu->vcpu_id = id; | |
b6958ce4 | 175 | init_waitqueue_head(&vcpu->wq); |
fb3f0f51 RR |
176 | |
177 | page = alloc_page(GFP_KERNEL | __GFP_ZERO); | |
178 | if (!page) { | |
179 | r = -ENOMEM; | |
180 | goto fail; | |
181 | } | |
182 | vcpu->run = page_address(page); | |
183 | ||
e9b11c17 | 184 | r = kvm_arch_vcpu_init(vcpu); |
fb3f0f51 | 185 | if (r < 0) |
e9b11c17 | 186 | goto fail_free_run; |
fb3f0f51 RR |
187 | return 0; |
188 | ||
fb3f0f51 RR |
189 | fail_free_run: |
190 | free_page((unsigned long)vcpu->run); | |
191 | fail: | |
76fafa5e | 192 | return r; |
fb3f0f51 RR |
193 | } |
194 | EXPORT_SYMBOL_GPL(kvm_vcpu_init); | |
195 | ||
196 | void kvm_vcpu_uninit(struct kvm_vcpu *vcpu) | |
197 | { | |
e9b11c17 | 198 | kvm_arch_vcpu_uninit(vcpu); |
fb3f0f51 RR |
199 | free_page((unsigned long)vcpu->run); |
200 | } | |
201 | EXPORT_SYMBOL_GPL(kvm_vcpu_uninit); | |
202 | ||
e930bffe AA |
203 | #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER) |
204 | static inline struct kvm *mmu_notifier_to_kvm(struct mmu_notifier *mn) | |
205 | { | |
206 | return container_of(mn, struct kvm, mmu_notifier); | |
207 | } | |
208 | ||
209 | static void kvm_mmu_notifier_invalidate_page(struct mmu_notifier *mn, | |
210 | struct mm_struct *mm, | |
211 | unsigned long address) | |
212 | { | |
213 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
214 | int need_tlb_flush; | |
215 | ||
216 | /* | |
217 | * When ->invalidate_page runs, the linux pte has been zapped | |
218 | * already but the page is still allocated until | |
219 | * ->invalidate_page returns. So if we increase the sequence | |
220 | * here the kvm page fault will notice if the spte can't be | |
221 | * established because the page is going to be freed. If | |
222 | * instead the kvm page fault establishes the spte before | |
223 | * ->invalidate_page runs, kvm_unmap_hva will release it | |
224 | * before returning. | |
225 | * | |
226 | * The sequence increase only need to be seen at spin_unlock | |
227 | * time, and not at spin_lock time. | |
228 | * | |
229 | * Increasing the sequence after the spin_unlock would be | |
230 | * unsafe because the kvm page fault could then establish the | |
231 | * pte after kvm_unmap_hva returned, without noticing the page | |
232 | * is going to be freed. | |
233 | */ | |
234 | spin_lock(&kvm->mmu_lock); | |
235 | kvm->mmu_notifier_seq++; | |
236 | need_tlb_flush = kvm_unmap_hva(kvm, address); | |
237 | spin_unlock(&kvm->mmu_lock); | |
238 | ||
239 | /* we've to flush the tlb before the pages can be freed */ | |
240 | if (need_tlb_flush) | |
241 | kvm_flush_remote_tlbs(kvm); | |
242 | ||
243 | } | |
244 | ||
245 | static void kvm_mmu_notifier_invalidate_range_start(struct mmu_notifier *mn, | |
246 | struct mm_struct *mm, | |
247 | unsigned long start, | |
248 | unsigned long end) | |
249 | { | |
250 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
251 | int need_tlb_flush = 0; | |
252 | ||
253 | spin_lock(&kvm->mmu_lock); | |
254 | /* | |
255 | * The count increase must become visible at unlock time as no | |
256 | * spte can be established without taking the mmu_lock and | |
257 | * count is also read inside the mmu_lock critical section. | |
258 | */ | |
259 | kvm->mmu_notifier_count++; | |
260 | for (; start < end; start += PAGE_SIZE) | |
261 | need_tlb_flush |= kvm_unmap_hva(kvm, start); | |
262 | spin_unlock(&kvm->mmu_lock); | |
263 | ||
264 | /* we've to flush the tlb before the pages can be freed */ | |
265 | if (need_tlb_flush) | |
266 | kvm_flush_remote_tlbs(kvm); | |
267 | } | |
268 | ||
269 | static void kvm_mmu_notifier_invalidate_range_end(struct mmu_notifier *mn, | |
270 | struct mm_struct *mm, | |
271 | unsigned long start, | |
272 | unsigned long end) | |
273 | { | |
274 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
275 | ||
276 | spin_lock(&kvm->mmu_lock); | |
277 | /* | |
278 | * This sequence increase will notify the kvm page fault that | |
279 | * the page that is going to be mapped in the spte could have | |
280 | * been freed. | |
281 | */ | |
282 | kvm->mmu_notifier_seq++; | |
283 | /* | |
284 | * The above sequence increase must be visible before the | |
285 | * below count decrease but both values are read by the kvm | |
286 | * page fault under mmu_lock spinlock so we don't need to add | |
287 | * a smb_wmb() here in between the two. | |
288 | */ | |
289 | kvm->mmu_notifier_count--; | |
290 | spin_unlock(&kvm->mmu_lock); | |
291 | ||
292 | BUG_ON(kvm->mmu_notifier_count < 0); | |
293 | } | |
294 | ||
295 | static int kvm_mmu_notifier_clear_flush_young(struct mmu_notifier *mn, | |
296 | struct mm_struct *mm, | |
297 | unsigned long address) | |
298 | { | |
299 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
300 | int young; | |
301 | ||
302 | spin_lock(&kvm->mmu_lock); | |
303 | young = kvm_age_hva(kvm, address); | |
304 | spin_unlock(&kvm->mmu_lock); | |
305 | ||
306 | if (young) | |
307 | kvm_flush_remote_tlbs(kvm); | |
308 | ||
309 | return young; | |
310 | } | |
311 | ||
312 | static const struct mmu_notifier_ops kvm_mmu_notifier_ops = { | |
313 | .invalidate_page = kvm_mmu_notifier_invalidate_page, | |
314 | .invalidate_range_start = kvm_mmu_notifier_invalidate_range_start, | |
315 | .invalidate_range_end = kvm_mmu_notifier_invalidate_range_end, | |
316 | .clear_flush_young = kvm_mmu_notifier_clear_flush_young, | |
317 | }; | |
318 | #endif /* CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER */ | |
319 | ||
f17abe9a | 320 | static struct kvm *kvm_create_vm(void) |
6aa8b732 | 321 | { |
d19a9cd2 | 322 | struct kvm *kvm = kvm_arch_create_vm(); |
5f94c174 LV |
323 | #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET |
324 | struct page *page; | |
325 | #endif | |
6aa8b732 | 326 | |
d19a9cd2 ZX |
327 | if (IS_ERR(kvm)) |
328 | goto out; | |
6aa8b732 | 329 | |
5f94c174 LV |
330 | #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET |
331 | page = alloc_page(GFP_KERNEL | __GFP_ZERO); | |
332 | if (!page) { | |
333 | kfree(kvm); | |
334 | return ERR_PTR(-ENOMEM); | |
335 | } | |
336 | kvm->coalesced_mmio_ring = | |
337 | (struct kvm_coalesced_mmio_ring *)page_address(page); | |
338 | #endif | |
339 | ||
e930bffe AA |
340 | #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER) |
341 | { | |
342 | int err; | |
343 | kvm->mmu_notifier.ops = &kvm_mmu_notifier_ops; | |
344 | err = mmu_notifier_register(&kvm->mmu_notifier, current->mm); | |
345 | if (err) { | |
346 | #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET | |
347 | put_page(page); | |
348 | #endif | |
349 | kfree(kvm); | |
350 | return ERR_PTR(err); | |
351 | } | |
352 | } | |
353 | #endif | |
354 | ||
6d4e4c4f AK |
355 | kvm->mm = current->mm; |
356 | atomic_inc(&kvm->mm->mm_count); | |
aaee2c94 | 357 | spin_lock_init(&kvm->mmu_lock); |
74906345 | 358 | kvm_io_bus_init(&kvm->pio_bus); |
11ec2804 | 359 | mutex_init(&kvm->lock); |
2eeb2e94 | 360 | kvm_io_bus_init(&kvm->mmio_bus); |
72dc67a6 | 361 | init_rwsem(&kvm->slots_lock); |
d39f13b0 | 362 | atomic_set(&kvm->users_count, 1); |
5e58cfe4 RR |
363 | spin_lock(&kvm_lock); |
364 | list_add(&kvm->vm_list, &vm_list); | |
365 | spin_unlock(&kvm_lock); | |
5f94c174 LV |
366 | #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET |
367 | kvm_coalesced_mmio_init(kvm); | |
368 | #endif | |
d19a9cd2 | 369 | out: |
f17abe9a AK |
370 | return kvm; |
371 | } | |
372 | ||
6aa8b732 AK |
373 | /* |
374 | * Free any memory in @free but not in @dont. | |
375 | */ | |
376 | static void kvm_free_physmem_slot(struct kvm_memory_slot *free, | |
377 | struct kvm_memory_slot *dont) | |
378 | { | |
290fc38d IE |
379 | if (!dont || free->rmap != dont->rmap) |
380 | vfree(free->rmap); | |
6aa8b732 AK |
381 | |
382 | if (!dont || free->dirty_bitmap != dont->dirty_bitmap) | |
383 | vfree(free->dirty_bitmap); | |
384 | ||
05da4558 MT |
385 | if (!dont || free->lpage_info != dont->lpage_info) |
386 | vfree(free->lpage_info); | |
387 | ||
6aa8b732 | 388 | free->npages = 0; |
8b6d44c7 | 389 | free->dirty_bitmap = NULL; |
8d4e1288 | 390 | free->rmap = NULL; |
05da4558 | 391 | free->lpage_info = NULL; |
6aa8b732 AK |
392 | } |
393 | ||
d19a9cd2 | 394 | void kvm_free_physmem(struct kvm *kvm) |
6aa8b732 AK |
395 | { |
396 | int i; | |
397 | ||
398 | for (i = 0; i < kvm->nmemslots; ++i) | |
8b6d44c7 | 399 | kvm_free_physmem_slot(&kvm->memslots[i], NULL); |
6aa8b732 AK |
400 | } |
401 | ||
f17abe9a AK |
402 | static void kvm_destroy_vm(struct kvm *kvm) |
403 | { | |
6d4e4c4f AK |
404 | struct mm_struct *mm = kvm->mm; |
405 | ||
133de902 AK |
406 | spin_lock(&kvm_lock); |
407 | list_del(&kvm->vm_list); | |
408 | spin_unlock(&kvm_lock); | |
74906345 | 409 | kvm_io_bus_destroy(&kvm->pio_bus); |
2eeb2e94 | 410 | kvm_io_bus_destroy(&kvm->mmio_bus); |
5f94c174 LV |
411 | #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET |
412 | if (kvm->coalesced_mmio_ring != NULL) | |
413 | free_page((unsigned long)kvm->coalesced_mmio_ring); | |
e930bffe AA |
414 | #endif |
415 | #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER) | |
416 | mmu_notifier_unregister(&kvm->mmu_notifier, kvm->mm); | |
5f94c174 | 417 | #endif |
d19a9cd2 | 418 | kvm_arch_destroy_vm(kvm); |
6d4e4c4f | 419 | mmdrop(mm); |
f17abe9a AK |
420 | } |
421 | ||
d39f13b0 IE |
422 | void kvm_get_kvm(struct kvm *kvm) |
423 | { | |
424 | atomic_inc(&kvm->users_count); | |
425 | } | |
426 | EXPORT_SYMBOL_GPL(kvm_get_kvm); | |
427 | ||
428 | void kvm_put_kvm(struct kvm *kvm) | |
429 | { | |
430 | if (atomic_dec_and_test(&kvm->users_count)) | |
431 | kvm_destroy_vm(kvm); | |
432 | } | |
433 | EXPORT_SYMBOL_GPL(kvm_put_kvm); | |
434 | ||
435 | ||
f17abe9a AK |
436 | static int kvm_vm_release(struct inode *inode, struct file *filp) |
437 | { | |
438 | struct kvm *kvm = filp->private_data; | |
439 | ||
d39f13b0 | 440 | kvm_put_kvm(kvm); |
6aa8b732 AK |
441 | return 0; |
442 | } | |
443 | ||
6aa8b732 AK |
444 | /* |
445 | * Allocate some memory and give it an address in the guest physical address | |
446 | * space. | |
447 | * | |
448 | * Discontiguous memory is allowed, mostly for framebuffers. | |
f78e0e2e | 449 | * |
10589a46 | 450 | * Must be called holding mmap_sem for write. |
6aa8b732 | 451 | */ |
f78e0e2e SY |
452 | int __kvm_set_memory_region(struct kvm *kvm, |
453 | struct kvm_userspace_memory_region *mem, | |
454 | int user_alloc) | |
6aa8b732 AK |
455 | { |
456 | int r; | |
457 | gfn_t base_gfn; | |
458 | unsigned long npages; | |
459 | unsigned long i; | |
460 | struct kvm_memory_slot *memslot; | |
461 | struct kvm_memory_slot old, new; | |
6aa8b732 AK |
462 | |
463 | r = -EINVAL; | |
464 | /* General sanity checks */ | |
465 | if (mem->memory_size & (PAGE_SIZE - 1)) | |
466 | goto out; | |
467 | if (mem->guest_phys_addr & (PAGE_SIZE - 1)) | |
468 | goto out; | |
e0d62c7f | 469 | if (mem->slot >= KVM_MEMORY_SLOTS + KVM_PRIVATE_MEM_SLOTS) |
6aa8b732 AK |
470 | goto out; |
471 | if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr) | |
472 | goto out; | |
473 | ||
474 | memslot = &kvm->memslots[mem->slot]; | |
475 | base_gfn = mem->guest_phys_addr >> PAGE_SHIFT; | |
476 | npages = mem->memory_size >> PAGE_SHIFT; | |
477 | ||
478 | if (!npages) | |
479 | mem->flags &= ~KVM_MEM_LOG_DIRTY_PAGES; | |
480 | ||
6aa8b732 AK |
481 | new = old = *memslot; |
482 | ||
483 | new.base_gfn = base_gfn; | |
484 | new.npages = npages; | |
485 | new.flags = mem->flags; | |
486 | ||
487 | /* Disallow changing a memory slot's size. */ | |
488 | r = -EINVAL; | |
489 | if (npages && old.npages && npages != old.npages) | |
f78e0e2e | 490 | goto out_free; |
6aa8b732 AK |
491 | |
492 | /* Check for overlaps */ | |
493 | r = -EEXIST; | |
494 | for (i = 0; i < KVM_MEMORY_SLOTS; ++i) { | |
495 | struct kvm_memory_slot *s = &kvm->memslots[i]; | |
496 | ||
497 | if (s == memslot) | |
498 | continue; | |
499 | if (!((base_gfn + npages <= s->base_gfn) || | |
500 | (base_gfn >= s->base_gfn + s->npages))) | |
f78e0e2e | 501 | goto out_free; |
6aa8b732 | 502 | } |
6aa8b732 | 503 | |
6aa8b732 AK |
504 | /* Free page dirty bitmap if unneeded */ |
505 | if (!(new.flags & KVM_MEM_LOG_DIRTY_PAGES)) | |
8b6d44c7 | 506 | new.dirty_bitmap = NULL; |
6aa8b732 AK |
507 | |
508 | r = -ENOMEM; | |
509 | ||
510 | /* Allocate if a slot is being created */ | |
eff0114a | 511 | #ifndef CONFIG_S390 |
8d4e1288 | 512 | if (npages && !new.rmap) { |
d77c26fc | 513 | new.rmap = vmalloc(npages * sizeof(struct page *)); |
290fc38d IE |
514 | |
515 | if (!new.rmap) | |
f78e0e2e | 516 | goto out_free; |
290fc38d | 517 | |
290fc38d | 518 | memset(new.rmap, 0, npages * sizeof(*new.rmap)); |
8d4e1288 | 519 | |
80b14b5b | 520 | new.user_alloc = user_alloc; |
604b38ac AA |
521 | /* |
522 | * hva_to_rmmap() serialzies with the mmu_lock and to be | |
523 | * safe it has to ignore memslots with !user_alloc && | |
524 | * !userspace_addr. | |
525 | */ | |
526 | if (user_alloc) | |
527 | new.userspace_addr = mem->userspace_addr; | |
528 | else | |
529 | new.userspace_addr = 0; | |
6aa8b732 | 530 | } |
05da4558 MT |
531 | if (npages && !new.lpage_info) { |
532 | int largepages = npages / KVM_PAGES_PER_HPAGE; | |
533 | if (npages % KVM_PAGES_PER_HPAGE) | |
534 | largepages++; | |
535 | if (base_gfn % KVM_PAGES_PER_HPAGE) | |
536 | largepages++; | |
537 | ||
538 | new.lpage_info = vmalloc(largepages * sizeof(*new.lpage_info)); | |
539 | ||
540 | if (!new.lpage_info) | |
541 | goto out_free; | |
542 | ||
543 | memset(new.lpage_info, 0, largepages * sizeof(*new.lpage_info)); | |
544 | ||
545 | if (base_gfn % KVM_PAGES_PER_HPAGE) | |
546 | new.lpage_info[0].write_count = 1; | |
547 | if ((base_gfn+npages) % KVM_PAGES_PER_HPAGE) | |
548 | new.lpage_info[largepages-1].write_count = 1; | |
549 | } | |
6aa8b732 AK |
550 | |
551 | /* Allocate page dirty bitmap if needed */ | |
552 | if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) { | |
553 | unsigned dirty_bytes = ALIGN(npages, BITS_PER_LONG) / 8; | |
554 | ||
555 | new.dirty_bitmap = vmalloc(dirty_bytes); | |
556 | if (!new.dirty_bitmap) | |
f78e0e2e | 557 | goto out_free; |
6aa8b732 AK |
558 | memset(new.dirty_bitmap, 0, dirty_bytes); |
559 | } | |
eff0114a | 560 | #endif /* not defined CONFIG_S390 */ |
6aa8b732 | 561 | |
34d4cb8f MT |
562 | if (!npages) |
563 | kvm_arch_flush_shadow(kvm); | |
564 | ||
604b38ac AA |
565 | spin_lock(&kvm->mmu_lock); |
566 | if (mem->slot >= kvm->nmemslots) | |
567 | kvm->nmemslots = mem->slot + 1; | |
568 | ||
3ad82a7e | 569 | *memslot = new; |
604b38ac | 570 | spin_unlock(&kvm->mmu_lock); |
3ad82a7e | 571 | |
0de10343 ZX |
572 | r = kvm_arch_set_memory_region(kvm, mem, old, user_alloc); |
573 | if (r) { | |
604b38ac | 574 | spin_lock(&kvm->mmu_lock); |
0de10343 | 575 | *memslot = old; |
604b38ac | 576 | spin_unlock(&kvm->mmu_lock); |
0de10343 | 577 | goto out_free; |
82ce2c96 IE |
578 | } |
579 | ||
6aa8b732 | 580 | kvm_free_physmem_slot(&old, &new); |
62c476c7 BAY |
581 | |
582 | /* map the pages in iommu page table */ | |
583 | r = kvm_iommu_map_pages(kvm, base_gfn, npages); | |
584 | if (r) | |
585 | goto out; | |
586 | ||
6aa8b732 AK |
587 | return 0; |
588 | ||
f78e0e2e | 589 | out_free: |
6aa8b732 AK |
590 | kvm_free_physmem_slot(&new, &old); |
591 | out: | |
592 | return r; | |
210c7c4d IE |
593 | |
594 | } | |
f78e0e2e SY |
595 | EXPORT_SYMBOL_GPL(__kvm_set_memory_region); |
596 | ||
597 | int kvm_set_memory_region(struct kvm *kvm, | |
598 | struct kvm_userspace_memory_region *mem, | |
599 | int user_alloc) | |
600 | { | |
601 | int r; | |
602 | ||
72dc67a6 | 603 | down_write(&kvm->slots_lock); |
f78e0e2e | 604 | r = __kvm_set_memory_region(kvm, mem, user_alloc); |
72dc67a6 | 605 | up_write(&kvm->slots_lock); |
f78e0e2e SY |
606 | return r; |
607 | } | |
210c7c4d IE |
608 | EXPORT_SYMBOL_GPL(kvm_set_memory_region); |
609 | ||
1fe779f8 CO |
610 | int kvm_vm_ioctl_set_memory_region(struct kvm *kvm, |
611 | struct | |
612 | kvm_userspace_memory_region *mem, | |
613 | int user_alloc) | |
210c7c4d | 614 | { |
e0d62c7f IE |
615 | if (mem->slot >= KVM_MEMORY_SLOTS) |
616 | return -EINVAL; | |
210c7c4d | 617 | return kvm_set_memory_region(kvm, mem, user_alloc); |
6aa8b732 AK |
618 | } |
619 | ||
5bb064dc ZX |
620 | int kvm_get_dirty_log(struct kvm *kvm, |
621 | struct kvm_dirty_log *log, int *is_dirty) | |
6aa8b732 AK |
622 | { |
623 | struct kvm_memory_slot *memslot; | |
624 | int r, i; | |
625 | int n; | |
626 | unsigned long any = 0; | |
627 | ||
6aa8b732 AK |
628 | r = -EINVAL; |
629 | if (log->slot >= KVM_MEMORY_SLOTS) | |
630 | goto out; | |
631 | ||
632 | memslot = &kvm->memslots[log->slot]; | |
633 | r = -ENOENT; | |
634 | if (!memslot->dirty_bitmap) | |
635 | goto out; | |
636 | ||
cd1a4a98 | 637 | n = ALIGN(memslot->npages, BITS_PER_LONG) / 8; |
6aa8b732 | 638 | |
cd1a4a98 | 639 | for (i = 0; !any && i < n/sizeof(long); ++i) |
6aa8b732 AK |
640 | any = memslot->dirty_bitmap[i]; |
641 | ||
642 | r = -EFAULT; | |
643 | if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n)) | |
644 | goto out; | |
645 | ||
5bb064dc ZX |
646 | if (any) |
647 | *is_dirty = 1; | |
6aa8b732 AK |
648 | |
649 | r = 0; | |
6aa8b732 | 650 | out: |
6aa8b732 AK |
651 | return r; |
652 | } | |
653 | ||
cea7bb21 IE |
654 | int is_error_page(struct page *page) |
655 | { | |
656 | return page == bad_page; | |
657 | } | |
658 | EXPORT_SYMBOL_GPL(is_error_page); | |
659 | ||
35149e21 AL |
660 | int is_error_pfn(pfn_t pfn) |
661 | { | |
662 | return pfn == bad_pfn; | |
663 | } | |
664 | EXPORT_SYMBOL_GPL(is_error_pfn); | |
665 | ||
f9d46eb0 IE |
666 | static inline unsigned long bad_hva(void) |
667 | { | |
668 | return PAGE_OFFSET; | |
669 | } | |
670 | ||
671 | int kvm_is_error_hva(unsigned long addr) | |
672 | { | |
673 | return addr == bad_hva(); | |
674 | } | |
675 | EXPORT_SYMBOL_GPL(kvm_is_error_hva); | |
676 | ||
e8207547 | 677 | static struct kvm_memory_slot *__gfn_to_memslot(struct kvm *kvm, gfn_t gfn) |
6aa8b732 AK |
678 | { |
679 | int i; | |
680 | ||
681 | for (i = 0; i < kvm->nmemslots; ++i) { | |
682 | struct kvm_memory_slot *memslot = &kvm->memslots[i]; | |
683 | ||
684 | if (gfn >= memslot->base_gfn | |
685 | && gfn < memslot->base_gfn + memslot->npages) | |
686 | return memslot; | |
687 | } | |
8b6d44c7 | 688 | return NULL; |
6aa8b732 | 689 | } |
e8207547 AK |
690 | |
691 | struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn) | |
692 | { | |
693 | gfn = unalias_gfn(kvm, gfn); | |
694 | return __gfn_to_memslot(kvm, gfn); | |
695 | } | |
6aa8b732 | 696 | |
e0d62c7f IE |
697 | int kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn) |
698 | { | |
699 | int i; | |
700 | ||
701 | gfn = unalias_gfn(kvm, gfn); | |
702 | for (i = 0; i < KVM_MEMORY_SLOTS; ++i) { | |
703 | struct kvm_memory_slot *memslot = &kvm->memslots[i]; | |
704 | ||
705 | if (gfn >= memslot->base_gfn | |
706 | && gfn < memslot->base_gfn + memslot->npages) | |
707 | return 1; | |
708 | } | |
709 | return 0; | |
710 | } | |
711 | EXPORT_SYMBOL_GPL(kvm_is_visible_gfn); | |
712 | ||
05da4558 | 713 | unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn) |
539cb660 IE |
714 | { |
715 | struct kvm_memory_slot *slot; | |
716 | ||
717 | gfn = unalias_gfn(kvm, gfn); | |
718 | slot = __gfn_to_memslot(kvm, gfn); | |
719 | if (!slot) | |
720 | return bad_hva(); | |
721 | return (slot->userspace_addr + (gfn - slot->base_gfn) * PAGE_SIZE); | |
722 | } | |
0d150298 | 723 | EXPORT_SYMBOL_GPL(gfn_to_hva); |
539cb660 | 724 | |
35149e21 | 725 | pfn_t gfn_to_pfn(struct kvm *kvm, gfn_t gfn) |
954bbbc2 | 726 | { |
8d4e1288 | 727 | struct page *page[1]; |
539cb660 | 728 | unsigned long addr; |
8d4e1288 | 729 | int npages; |
2e2e3738 | 730 | pfn_t pfn; |
954bbbc2 | 731 | |
60395224 AK |
732 | might_sleep(); |
733 | ||
539cb660 IE |
734 | addr = gfn_to_hva(kvm, gfn); |
735 | if (kvm_is_error_hva(addr)) { | |
8a7ae055 | 736 | get_page(bad_page); |
35149e21 | 737 | return page_to_pfn(bad_page); |
8a7ae055 | 738 | } |
8d4e1288 | 739 | |
4c2155ce | 740 | npages = get_user_pages_fast(addr, 1, 1, page); |
539cb660 | 741 | |
2e2e3738 AL |
742 | if (unlikely(npages != 1)) { |
743 | struct vm_area_struct *vma; | |
744 | ||
4c2155ce | 745 | down_read(¤t->mm->mmap_sem); |
2e2e3738 | 746 | vma = find_vma(current->mm, addr); |
4c2155ce | 747 | |
2e2e3738 AL |
748 | if (vma == NULL || addr < vma->vm_start || |
749 | !(vma->vm_flags & VM_PFNMAP)) { | |
4c2155ce | 750 | up_read(¤t->mm->mmap_sem); |
2e2e3738 AL |
751 | get_page(bad_page); |
752 | return page_to_pfn(bad_page); | |
753 | } | |
754 | ||
755 | pfn = ((addr - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff; | |
4c2155ce | 756 | up_read(¤t->mm->mmap_sem); |
cbff90a7 | 757 | BUG_ON(!is_mmio_pfn(pfn)); |
2e2e3738 AL |
758 | } else |
759 | pfn = page_to_pfn(page[0]); | |
8d4e1288 | 760 | |
2e2e3738 | 761 | return pfn; |
35149e21 AL |
762 | } |
763 | ||
764 | EXPORT_SYMBOL_GPL(gfn_to_pfn); | |
765 | ||
766 | struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn) | |
767 | { | |
2e2e3738 AL |
768 | pfn_t pfn; |
769 | ||
770 | pfn = gfn_to_pfn(kvm, gfn); | |
cbff90a7 | 771 | if (!is_mmio_pfn(pfn)) |
2e2e3738 AL |
772 | return pfn_to_page(pfn); |
773 | ||
cbff90a7 | 774 | WARN_ON(is_mmio_pfn(pfn)); |
2e2e3738 AL |
775 | |
776 | get_page(bad_page); | |
777 | return bad_page; | |
954bbbc2 | 778 | } |
aab61cc0 | 779 | |
954bbbc2 AK |
780 | EXPORT_SYMBOL_GPL(gfn_to_page); |
781 | ||
b4231d61 IE |
782 | void kvm_release_page_clean(struct page *page) |
783 | { | |
35149e21 | 784 | kvm_release_pfn_clean(page_to_pfn(page)); |
b4231d61 IE |
785 | } |
786 | EXPORT_SYMBOL_GPL(kvm_release_page_clean); | |
787 | ||
35149e21 AL |
788 | void kvm_release_pfn_clean(pfn_t pfn) |
789 | { | |
cbff90a7 | 790 | if (!is_mmio_pfn(pfn)) |
2e2e3738 | 791 | put_page(pfn_to_page(pfn)); |
35149e21 AL |
792 | } |
793 | EXPORT_SYMBOL_GPL(kvm_release_pfn_clean); | |
794 | ||
b4231d61 | 795 | void kvm_release_page_dirty(struct page *page) |
8a7ae055 | 796 | { |
35149e21 AL |
797 | kvm_release_pfn_dirty(page_to_pfn(page)); |
798 | } | |
799 | EXPORT_SYMBOL_GPL(kvm_release_page_dirty); | |
800 | ||
801 | void kvm_release_pfn_dirty(pfn_t pfn) | |
802 | { | |
803 | kvm_set_pfn_dirty(pfn); | |
804 | kvm_release_pfn_clean(pfn); | |
805 | } | |
806 | EXPORT_SYMBOL_GPL(kvm_release_pfn_dirty); | |
807 | ||
808 | void kvm_set_page_dirty(struct page *page) | |
809 | { | |
810 | kvm_set_pfn_dirty(page_to_pfn(page)); | |
811 | } | |
812 | EXPORT_SYMBOL_GPL(kvm_set_page_dirty); | |
813 | ||
814 | void kvm_set_pfn_dirty(pfn_t pfn) | |
815 | { | |
cbff90a7 | 816 | if (!is_mmio_pfn(pfn)) { |
2e2e3738 AL |
817 | struct page *page = pfn_to_page(pfn); |
818 | if (!PageReserved(page)) | |
819 | SetPageDirty(page); | |
820 | } | |
8a7ae055 | 821 | } |
35149e21 AL |
822 | EXPORT_SYMBOL_GPL(kvm_set_pfn_dirty); |
823 | ||
824 | void kvm_set_pfn_accessed(pfn_t pfn) | |
825 | { | |
cbff90a7 | 826 | if (!is_mmio_pfn(pfn)) |
2e2e3738 | 827 | mark_page_accessed(pfn_to_page(pfn)); |
35149e21 AL |
828 | } |
829 | EXPORT_SYMBOL_GPL(kvm_set_pfn_accessed); | |
830 | ||
831 | void kvm_get_pfn(pfn_t pfn) | |
832 | { | |
cbff90a7 | 833 | if (!is_mmio_pfn(pfn)) |
2e2e3738 | 834 | get_page(pfn_to_page(pfn)); |
35149e21 AL |
835 | } |
836 | EXPORT_SYMBOL_GPL(kvm_get_pfn); | |
8a7ae055 | 837 | |
195aefde IE |
838 | static int next_segment(unsigned long len, int offset) |
839 | { | |
840 | if (len > PAGE_SIZE - offset) | |
841 | return PAGE_SIZE - offset; | |
842 | else | |
843 | return len; | |
844 | } | |
845 | ||
846 | int kvm_read_guest_page(struct kvm *kvm, gfn_t gfn, void *data, int offset, | |
847 | int len) | |
848 | { | |
e0506bcb IE |
849 | int r; |
850 | unsigned long addr; | |
195aefde | 851 | |
e0506bcb IE |
852 | addr = gfn_to_hva(kvm, gfn); |
853 | if (kvm_is_error_hva(addr)) | |
854 | return -EFAULT; | |
855 | r = copy_from_user(data, (void __user *)addr + offset, len); | |
856 | if (r) | |
195aefde | 857 | return -EFAULT; |
195aefde IE |
858 | return 0; |
859 | } | |
860 | EXPORT_SYMBOL_GPL(kvm_read_guest_page); | |
861 | ||
862 | int kvm_read_guest(struct kvm *kvm, gpa_t gpa, void *data, unsigned long len) | |
863 | { | |
864 | gfn_t gfn = gpa >> PAGE_SHIFT; | |
865 | int seg; | |
866 | int offset = offset_in_page(gpa); | |
867 | int ret; | |
868 | ||
869 | while ((seg = next_segment(len, offset)) != 0) { | |
870 | ret = kvm_read_guest_page(kvm, gfn, data, offset, seg); | |
871 | if (ret < 0) | |
872 | return ret; | |
873 | offset = 0; | |
874 | len -= seg; | |
875 | data += seg; | |
876 | ++gfn; | |
877 | } | |
878 | return 0; | |
879 | } | |
880 | EXPORT_SYMBOL_GPL(kvm_read_guest); | |
881 | ||
7ec54588 MT |
882 | int kvm_read_guest_atomic(struct kvm *kvm, gpa_t gpa, void *data, |
883 | unsigned long len) | |
884 | { | |
885 | int r; | |
886 | unsigned long addr; | |
887 | gfn_t gfn = gpa >> PAGE_SHIFT; | |
888 | int offset = offset_in_page(gpa); | |
889 | ||
890 | addr = gfn_to_hva(kvm, gfn); | |
891 | if (kvm_is_error_hva(addr)) | |
892 | return -EFAULT; | |
0aac03f0 | 893 | pagefault_disable(); |
7ec54588 | 894 | r = __copy_from_user_inatomic(data, (void __user *)addr + offset, len); |
0aac03f0 | 895 | pagefault_enable(); |
7ec54588 MT |
896 | if (r) |
897 | return -EFAULT; | |
898 | return 0; | |
899 | } | |
900 | EXPORT_SYMBOL(kvm_read_guest_atomic); | |
901 | ||
195aefde IE |
902 | int kvm_write_guest_page(struct kvm *kvm, gfn_t gfn, const void *data, |
903 | int offset, int len) | |
904 | { | |
e0506bcb IE |
905 | int r; |
906 | unsigned long addr; | |
195aefde | 907 | |
e0506bcb IE |
908 | addr = gfn_to_hva(kvm, gfn); |
909 | if (kvm_is_error_hva(addr)) | |
910 | return -EFAULT; | |
911 | r = copy_to_user((void __user *)addr + offset, data, len); | |
912 | if (r) | |
195aefde | 913 | return -EFAULT; |
195aefde IE |
914 | mark_page_dirty(kvm, gfn); |
915 | return 0; | |
916 | } | |
917 | EXPORT_SYMBOL_GPL(kvm_write_guest_page); | |
918 | ||
919 | int kvm_write_guest(struct kvm *kvm, gpa_t gpa, const void *data, | |
920 | unsigned long len) | |
921 | { | |
922 | gfn_t gfn = gpa >> PAGE_SHIFT; | |
923 | int seg; | |
924 | int offset = offset_in_page(gpa); | |
925 | int ret; | |
926 | ||
927 | while ((seg = next_segment(len, offset)) != 0) { | |
928 | ret = kvm_write_guest_page(kvm, gfn, data, offset, seg); | |
929 | if (ret < 0) | |
930 | return ret; | |
931 | offset = 0; | |
932 | len -= seg; | |
933 | data += seg; | |
934 | ++gfn; | |
935 | } | |
936 | return 0; | |
937 | } | |
938 | ||
939 | int kvm_clear_guest_page(struct kvm *kvm, gfn_t gfn, int offset, int len) | |
940 | { | |
3e021bf5 | 941 | return kvm_write_guest_page(kvm, gfn, empty_zero_page, offset, len); |
195aefde IE |
942 | } |
943 | EXPORT_SYMBOL_GPL(kvm_clear_guest_page); | |
944 | ||
945 | int kvm_clear_guest(struct kvm *kvm, gpa_t gpa, unsigned long len) | |
946 | { | |
947 | gfn_t gfn = gpa >> PAGE_SHIFT; | |
948 | int seg; | |
949 | int offset = offset_in_page(gpa); | |
950 | int ret; | |
951 | ||
952 | while ((seg = next_segment(len, offset)) != 0) { | |
953 | ret = kvm_clear_guest_page(kvm, gfn, offset, seg); | |
954 | if (ret < 0) | |
955 | return ret; | |
956 | offset = 0; | |
957 | len -= seg; | |
958 | ++gfn; | |
959 | } | |
960 | return 0; | |
961 | } | |
962 | EXPORT_SYMBOL_GPL(kvm_clear_guest); | |
963 | ||
6aa8b732 AK |
964 | void mark_page_dirty(struct kvm *kvm, gfn_t gfn) |
965 | { | |
31389947 | 966 | struct kvm_memory_slot *memslot; |
6aa8b732 | 967 | |
3b6fff19 | 968 | gfn = unalias_gfn(kvm, gfn); |
7e9d619d RR |
969 | memslot = __gfn_to_memslot(kvm, gfn); |
970 | if (memslot && memslot->dirty_bitmap) { | |
971 | unsigned long rel_gfn = gfn - memslot->base_gfn; | |
6aa8b732 | 972 | |
7e9d619d RR |
973 | /* avoid RMW */ |
974 | if (!test_bit(rel_gfn, memslot->dirty_bitmap)) | |
975 | set_bit(rel_gfn, memslot->dirty_bitmap); | |
6aa8b732 AK |
976 | } |
977 | } | |
978 | ||
b6958ce4 ED |
979 | /* |
980 | * The vCPU has executed a HLT instruction with in-kernel mode enabled. | |
981 | */ | |
8776e519 | 982 | void kvm_vcpu_block(struct kvm_vcpu *vcpu) |
d3bef15f | 983 | { |
e5c239cf MT |
984 | DEFINE_WAIT(wait); |
985 | ||
986 | for (;;) { | |
987 | prepare_to_wait(&vcpu->wq, &wait, TASK_INTERRUPTIBLE); | |
988 | ||
d7690175 MT |
989 | if (kvm_cpu_has_interrupt(vcpu) || |
990 | kvm_cpu_has_pending_timer(vcpu) || | |
991 | kvm_arch_vcpu_runnable(vcpu)) { | |
992 | set_bit(KVM_REQ_UNHALT, &vcpu->requests); | |
e5c239cf | 993 | break; |
d7690175 | 994 | } |
e5c239cf MT |
995 | if (signal_pending(current)) |
996 | break; | |
997 | ||
b6958ce4 ED |
998 | vcpu_put(vcpu); |
999 | schedule(); | |
1000 | vcpu_load(vcpu); | |
1001 | } | |
d3bef15f | 1002 | |
e5c239cf | 1003 | finish_wait(&vcpu->wq, &wait); |
b6958ce4 ED |
1004 | } |
1005 | ||
6aa8b732 AK |
1006 | void kvm_resched(struct kvm_vcpu *vcpu) |
1007 | { | |
3fca0365 YD |
1008 | if (!need_resched()) |
1009 | return; | |
6aa8b732 | 1010 | cond_resched(); |
6aa8b732 AK |
1011 | } |
1012 | EXPORT_SYMBOL_GPL(kvm_resched); | |
1013 | ||
e4a533a4 | 1014 | static int kvm_vcpu_fault(struct vm_area_struct *vma, struct vm_fault *vmf) |
9a2bb7f4 AK |
1015 | { |
1016 | struct kvm_vcpu *vcpu = vma->vm_file->private_data; | |
9a2bb7f4 AK |
1017 | struct page *page; |
1018 | ||
e4a533a4 | 1019 | if (vmf->pgoff == 0) |
039576c0 | 1020 | page = virt_to_page(vcpu->run); |
09566765 | 1021 | #ifdef CONFIG_X86 |
e4a533a4 | 1022 | else if (vmf->pgoff == KVM_PIO_PAGE_OFFSET) |
ad312c7c | 1023 | page = virt_to_page(vcpu->arch.pio_data); |
5f94c174 LV |
1024 | #endif |
1025 | #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET | |
1026 | else if (vmf->pgoff == KVM_COALESCED_MMIO_PAGE_OFFSET) | |
1027 | page = virt_to_page(vcpu->kvm->coalesced_mmio_ring); | |
09566765 | 1028 | #endif |
039576c0 | 1029 | else |
e4a533a4 | 1030 | return VM_FAULT_SIGBUS; |
9a2bb7f4 | 1031 | get_page(page); |
e4a533a4 | 1032 | vmf->page = page; |
1033 | return 0; | |
9a2bb7f4 AK |
1034 | } |
1035 | ||
1036 | static struct vm_operations_struct kvm_vcpu_vm_ops = { | |
e4a533a4 | 1037 | .fault = kvm_vcpu_fault, |
9a2bb7f4 AK |
1038 | }; |
1039 | ||
1040 | static int kvm_vcpu_mmap(struct file *file, struct vm_area_struct *vma) | |
1041 | { | |
1042 | vma->vm_ops = &kvm_vcpu_vm_ops; | |
1043 | return 0; | |
1044 | } | |
1045 | ||
bccf2150 AK |
1046 | static int kvm_vcpu_release(struct inode *inode, struct file *filp) |
1047 | { | |
1048 | struct kvm_vcpu *vcpu = filp->private_data; | |
1049 | ||
66c0b394 | 1050 | kvm_put_kvm(vcpu->kvm); |
bccf2150 AK |
1051 | return 0; |
1052 | } | |
1053 | ||
5c502742 | 1054 | static const struct file_operations kvm_vcpu_fops = { |
bccf2150 AK |
1055 | .release = kvm_vcpu_release, |
1056 | .unlocked_ioctl = kvm_vcpu_ioctl, | |
1057 | .compat_ioctl = kvm_vcpu_ioctl, | |
9a2bb7f4 | 1058 | .mmap = kvm_vcpu_mmap, |
bccf2150 AK |
1059 | }; |
1060 | ||
1061 | /* | |
1062 | * Allocates an inode for the vcpu. | |
1063 | */ | |
1064 | static int create_vcpu_fd(struct kvm_vcpu *vcpu) | |
1065 | { | |
7d9dbca3 | 1066 | int fd = anon_inode_getfd("kvm-vcpu", &kvm_vcpu_fops, vcpu, 0); |
2030a42c | 1067 | if (fd < 0) |
66c0b394 | 1068 | kvm_put_kvm(vcpu->kvm); |
bccf2150 | 1069 | return fd; |
bccf2150 AK |
1070 | } |
1071 | ||
c5ea7660 AK |
1072 | /* |
1073 | * Creates some virtual cpus. Good luck creating more than one. | |
1074 | */ | |
1075 | static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, int n) | |
1076 | { | |
1077 | int r; | |
1078 | struct kvm_vcpu *vcpu; | |
1079 | ||
c5ea7660 | 1080 | if (!valid_vcpu(n)) |
fb3f0f51 | 1081 | return -EINVAL; |
c5ea7660 | 1082 | |
e9b11c17 | 1083 | vcpu = kvm_arch_vcpu_create(kvm, n); |
fb3f0f51 RR |
1084 | if (IS_ERR(vcpu)) |
1085 | return PTR_ERR(vcpu); | |
c5ea7660 | 1086 | |
15ad7146 AK |
1087 | preempt_notifier_init(&vcpu->preempt_notifier, &kvm_preempt_ops); |
1088 | ||
26e5215f AK |
1089 | r = kvm_arch_vcpu_setup(vcpu); |
1090 | if (r) | |
7d8fece6 | 1091 | return r; |
26e5215f | 1092 | |
11ec2804 | 1093 | mutex_lock(&kvm->lock); |
fb3f0f51 RR |
1094 | if (kvm->vcpus[n]) { |
1095 | r = -EEXIST; | |
e9b11c17 | 1096 | goto vcpu_destroy; |
fb3f0f51 RR |
1097 | } |
1098 | kvm->vcpus[n] = vcpu; | |
11ec2804 | 1099 | mutex_unlock(&kvm->lock); |
c5ea7660 | 1100 | |
fb3f0f51 | 1101 | /* Now it's all set up, let userspace reach it */ |
66c0b394 | 1102 | kvm_get_kvm(kvm); |
bccf2150 AK |
1103 | r = create_vcpu_fd(vcpu); |
1104 | if (r < 0) | |
fb3f0f51 RR |
1105 | goto unlink; |
1106 | return r; | |
39c3b86e | 1107 | |
fb3f0f51 | 1108 | unlink: |
11ec2804 | 1109 | mutex_lock(&kvm->lock); |
fb3f0f51 | 1110 | kvm->vcpus[n] = NULL; |
e9b11c17 | 1111 | vcpu_destroy: |
7d8fece6 | 1112 | mutex_unlock(&kvm->lock); |
d40ccc62 | 1113 | kvm_arch_vcpu_destroy(vcpu); |
c5ea7660 AK |
1114 | return r; |
1115 | } | |
1116 | ||
1961d276 AK |
1117 | static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu *vcpu, sigset_t *sigset) |
1118 | { | |
1119 | if (sigset) { | |
1120 | sigdelsetmask(sigset, sigmask(SIGKILL)|sigmask(SIGSTOP)); | |
1121 | vcpu->sigset_active = 1; | |
1122 | vcpu->sigset = *sigset; | |
1123 | } else | |
1124 | vcpu->sigset_active = 0; | |
1125 | return 0; | |
1126 | } | |
1127 | ||
bccf2150 AK |
1128 | static long kvm_vcpu_ioctl(struct file *filp, |
1129 | unsigned int ioctl, unsigned long arg) | |
6aa8b732 | 1130 | { |
bccf2150 | 1131 | struct kvm_vcpu *vcpu = filp->private_data; |
2f366987 | 1132 | void __user *argp = (void __user *)arg; |
313a3dc7 | 1133 | int r; |
fa3795a7 DH |
1134 | struct kvm_fpu *fpu = NULL; |
1135 | struct kvm_sregs *kvm_sregs = NULL; | |
6aa8b732 | 1136 | |
6d4e4c4f AK |
1137 | if (vcpu->kvm->mm != current->mm) |
1138 | return -EIO; | |
6aa8b732 | 1139 | switch (ioctl) { |
9a2bb7f4 | 1140 | case KVM_RUN: |
f0fe5108 AK |
1141 | r = -EINVAL; |
1142 | if (arg) | |
1143 | goto out; | |
b6c7a5dc | 1144 | r = kvm_arch_vcpu_ioctl_run(vcpu, vcpu->run); |
6aa8b732 | 1145 | break; |
6aa8b732 | 1146 | case KVM_GET_REGS: { |
3e4bb3ac | 1147 | struct kvm_regs *kvm_regs; |
6aa8b732 | 1148 | |
3e4bb3ac XZ |
1149 | r = -ENOMEM; |
1150 | kvm_regs = kzalloc(sizeof(struct kvm_regs), GFP_KERNEL); | |
1151 | if (!kvm_regs) | |
6aa8b732 | 1152 | goto out; |
3e4bb3ac XZ |
1153 | r = kvm_arch_vcpu_ioctl_get_regs(vcpu, kvm_regs); |
1154 | if (r) | |
1155 | goto out_free1; | |
6aa8b732 | 1156 | r = -EFAULT; |
3e4bb3ac XZ |
1157 | if (copy_to_user(argp, kvm_regs, sizeof(struct kvm_regs))) |
1158 | goto out_free1; | |
6aa8b732 | 1159 | r = 0; |
3e4bb3ac XZ |
1160 | out_free1: |
1161 | kfree(kvm_regs); | |
6aa8b732 AK |
1162 | break; |
1163 | } | |
1164 | case KVM_SET_REGS: { | |
3e4bb3ac | 1165 | struct kvm_regs *kvm_regs; |
6aa8b732 | 1166 | |
3e4bb3ac XZ |
1167 | r = -ENOMEM; |
1168 | kvm_regs = kzalloc(sizeof(struct kvm_regs), GFP_KERNEL); | |
1169 | if (!kvm_regs) | |
6aa8b732 | 1170 | goto out; |
3e4bb3ac XZ |
1171 | r = -EFAULT; |
1172 | if (copy_from_user(kvm_regs, argp, sizeof(struct kvm_regs))) | |
1173 | goto out_free2; | |
1174 | r = kvm_arch_vcpu_ioctl_set_regs(vcpu, kvm_regs); | |
6aa8b732 | 1175 | if (r) |
3e4bb3ac | 1176 | goto out_free2; |
6aa8b732 | 1177 | r = 0; |
3e4bb3ac XZ |
1178 | out_free2: |
1179 | kfree(kvm_regs); | |
6aa8b732 AK |
1180 | break; |
1181 | } | |
1182 | case KVM_GET_SREGS: { | |
fa3795a7 DH |
1183 | kvm_sregs = kzalloc(sizeof(struct kvm_sregs), GFP_KERNEL); |
1184 | r = -ENOMEM; | |
1185 | if (!kvm_sregs) | |
1186 | goto out; | |
1187 | r = kvm_arch_vcpu_ioctl_get_sregs(vcpu, kvm_sregs); | |
6aa8b732 AK |
1188 | if (r) |
1189 | goto out; | |
1190 | r = -EFAULT; | |
fa3795a7 | 1191 | if (copy_to_user(argp, kvm_sregs, sizeof(struct kvm_sregs))) |
6aa8b732 AK |
1192 | goto out; |
1193 | r = 0; | |
1194 | break; | |
1195 | } | |
1196 | case KVM_SET_SREGS: { | |
fa3795a7 DH |
1197 | kvm_sregs = kmalloc(sizeof(struct kvm_sregs), GFP_KERNEL); |
1198 | r = -ENOMEM; | |
1199 | if (!kvm_sregs) | |
1200 | goto out; | |
6aa8b732 | 1201 | r = -EFAULT; |
fa3795a7 | 1202 | if (copy_from_user(kvm_sregs, argp, sizeof(struct kvm_sregs))) |
6aa8b732 | 1203 | goto out; |
fa3795a7 | 1204 | r = kvm_arch_vcpu_ioctl_set_sregs(vcpu, kvm_sregs); |
6aa8b732 AK |
1205 | if (r) |
1206 | goto out; | |
1207 | r = 0; | |
1208 | break; | |
1209 | } | |
62d9f0db MT |
1210 | case KVM_GET_MP_STATE: { |
1211 | struct kvm_mp_state mp_state; | |
1212 | ||
1213 | r = kvm_arch_vcpu_ioctl_get_mpstate(vcpu, &mp_state); | |
1214 | if (r) | |
1215 | goto out; | |
1216 | r = -EFAULT; | |
1217 | if (copy_to_user(argp, &mp_state, sizeof mp_state)) | |
1218 | goto out; | |
1219 | r = 0; | |
1220 | break; | |
1221 | } | |
1222 | case KVM_SET_MP_STATE: { | |
1223 | struct kvm_mp_state mp_state; | |
1224 | ||
1225 | r = -EFAULT; | |
1226 | if (copy_from_user(&mp_state, argp, sizeof mp_state)) | |
1227 | goto out; | |
1228 | r = kvm_arch_vcpu_ioctl_set_mpstate(vcpu, &mp_state); | |
1229 | if (r) | |
1230 | goto out; | |
1231 | r = 0; | |
1232 | break; | |
1233 | } | |
6aa8b732 AK |
1234 | case KVM_TRANSLATE: { |
1235 | struct kvm_translation tr; | |
1236 | ||
1237 | r = -EFAULT; | |
2f366987 | 1238 | if (copy_from_user(&tr, argp, sizeof tr)) |
6aa8b732 | 1239 | goto out; |
8b006791 | 1240 | r = kvm_arch_vcpu_ioctl_translate(vcpu, &tr); |
6aa8b732 AK |
1241 | if (r) |
1242 | goto out; | |
1243 | r = -EFAULT; | |
2f366987 | 1244 | if (copy_to_user(argp, &tr, sizeof tr)) |
6aa8b732 AK |
1245 | goto out; |
1246 | r = 0; | |
1247 | break; | |
1248 | } | |
6aa8b732 AK |
1249 | case KVM_DEBUG_GUEST: { |
1250 | struct kvm_debug_guest dbg; | |
1251 | ||
1252 | r = -EFAULT; | |
2f366987 | 1253 | if (copy_from_user(&dbg, argp, sizeof dbg)) |
6aa8b732 | 1254 | goto out; |
b6c7a5dc | 1255 | r = kvm_arch_vcpu_ioctl_debug_guest(vcpu, &dbg); |
6aa8b732 AK |
1256 | if (r) |
1257 | goto out; | |
1258 | r = 0; | |
1259 | break; | |
1260 | } | |
1961d276 AK |
1261 | case KVM_SET_SIGNAL_MASK: { |
1262 | struct kvm_signal_mask __user *sigmask_arg = argp; | |
1263 | struct kvm_signal_mask kvm_sigmask; | |
1264 | sigset_t sigset, *p; | |
1265 | ||
1266 | p = NULL; | |
1267 | if (argp) { | |
1268 | r = -EFAULT; | |
1269 | if (copy_from_user(&kvm_sigmask, argp, | |
1270 | sizeof kvm_sigmask)) | |
1271 | goto out; | |
1272 | r = -EINVAL; | |
1273 | if (kvm_sigmask.len != sizeof sigset) | |
1274 | goto out; | |
1275 | r = -EFAULT; | |
1276 | if (copy_from_user(&sigset, sigmask_arg->sigset, | |
1277 | sizeof sigset)) | |
1278 | goto out; | |
1279 | p = &sigset; | |
1280 | } | |
1281 | r = kvm_vcpu_ioctl_set_sigmask(vcpu, &sigset); | |
1282 | break; | |
1283 | } | |
b8836737 | 1284 | case KVM_GET_FPU: { |
fa3795a7 DH |
1285 | fpu = kzalloc(sizeof(struct kvm_fpu), GFP_KERNEL); |
1286 | r = -ENOMEM; | |
1287 | if (!fpu) | |
1288 | goto out; | |
1289 | r = kvm_arch_vcpu_ioctl_get_fpu(vcpu, fpu); | |
b8836737 AK |
1290 | if (r) |
1291 | goto out; | |
1292 | r = -EFAULT; | |
fa3795a7 | 1293 | if (copy_to_user(argp, fpu, sizeof(struct kvm_fpu))) |
b8836737 AK |
1294 | goto out; |
1295 | r = 0; | |
1296 | break; | |
1297 | } | |
1298 | case KVM_SET_FPU: { | |
fa3795a7 DH |
1299 | fpu = kmalloc(sizeof(struct kvm_fpu), GFP_KERNEL); |
1300 | r = -ENOMEM; | |
1301 | if (!fpu) | |
1302 | goto out; | |
b8836737 | 1303 | r = -EFAULT; |
fa3795a7 | 1304 | if (copy_from_user(fpu, argp, sizeof(struct kvm_fpu))) |
b8836737 | 1305 | goto out; |
fa3795a7 | 1306 | r = kvm_arch_vcpu_ioctl_set_fpu(vcpu, fpu); |
b8836737 AK |
1307 | if (r) |
1308 | goto out; | |
1309 | r = 0; | |
1310 | break; | |
1311 | } | |
bccf2150 | 1312 | default: |
313a3dc7 | 1313 | r = kvm_arch_vcpu_ioctl(filp, ioctl, arg); |
bccf2150 AK |
1314 | } |
1315 | out: | |
fa3795a7 DH |
1316 | kfree(fpu); |
1317 | kfree(kvm_sregs); | |
bccf2150 AK |
1318 | return r; |
1319 | } | |
1320 | ||
1321 | static long kvm_vm_ioctl(struct file *filp, | |
1322 | unsigned int ioctl, unsigned long arg) | |
1323 | { | |
1324 | struct kvm *kvm = filp->private_data; | |
1325 | void __user *argp = (void __user *)arg; | |
1fe779f8 | 1326 | int r; |
bccf2150 | 1327 | |
6d4e4c4f AK |
1328 | if (kvm->mm != current->mm) |
1329 | return -EIO; | |
bccf2150 AK |
1330 | switch (ioctl) { |
1331 | case KVM_CREATE_VCPU: | |
1332 | r = kvm_vm_ioctl_create_vcpu(kvm, arg); | |
1333 | if (r < 0) | |
1334 | goto out; | |
1335 | break; | |
6fc138d2 IE |
1336 | case KVM_SET_USER_MEMORY_REGION: { |
1337 | struct kvm_userspace_memory_region kvm_userspace_mem; | |
1338 | ||
1339 | r = -EFAULT; | |
1340 | if (copy_from_user(&kvm_userspace_mem, argp, | |
1341 | sizeof kvm_userspace_mem)) | |
1342 | goto out; | |
1343 | ||
1344 | r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_userspace_mem, 1); | |
6aa8b732 AK |
1345 | if (r) |
1346 | goto out; | |
1347 | break; | |
1348 | } | |
1349 | case KVM_GET_DIRTY_LOG: { | |
1350 | struct kvm_dirty_log log; | |
1351 | ||
1352 | r = -EFAULT; | |
2f366987 | 1353 | if (copy_from_user(&log, argp, sizeof log)) |
6aa8b732 | 1354 | goto out; |
2c6f5df9 | 1355 | r = kvm_vm_ioctl_get_dirty_log(kvm, &log); |
6aa8b732 AK |
1356 | if (r) |
1357 | goto out; | |
1358 | break; | |
1359 | } | |
5f94c174 LV |
1360 | #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET |
1361 | case KVM_REGISTER_COALESCED_MMIO: { | |
1362 | struct kvm_coalesced_mmio_zone zone; | |
1363 | r = -EFAULT; | |
1364 | if (copy_from_user(&zone, argp, sizeof zone)) | |
1365 | goto out; | |
1366 | r = -ENXIO; | |
1367 | r = kvm_vm_ioctl_register_coalesced_mmio(kvm, &zone); | |
1368 | if (r) | |
1369 | goto out; | |
1370 | r = 0; | |
1371 | break; | |
1372 | } | |
1373 | case KVM_UNREGISTER_COALESCED_MMIO: { | |
1374 | struct kvm_coalesced_mmio_zone zone; | |
1375 | r = -EFAULT; | |
1376 | if (copy_from_user(&zone, argp, sizeof zone)) | |
1377 | goto out; | |
1378 | r = -ENXIO; | |
1379 | r = kvm_vm_ioctl_unregister_coalesced_mmio(kvm, &zone); | |
1380 | if (r) | |
1381 | goto out; | |
1382 | r = 0; | |
1383 | break; | |
1384 | } | |
1385 | #endif | |
f17abe9a | 1386 | default: |
1fe779f8 | 1387 | r = kvm_arch_vm_ioctl(filp, ioctl, arg); |
f17abe9a AK |
1388 | } |
1389 | out: | |
1390 | return r; | |
1391 | } | |
1392 | ||
e4a533a4 | 1393 | static int kvm_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf) |
f17abe9a | 1394 | { |
777b3f49 MT |
1395 | struct page *page[1]; |
1396 | unsigned long addr; | |
1397 | int npages; | |
1398 | gfn_t gfn = vmf->pgoff; | |
f17abe9a | 1399 | struct kvm *kvm = vma->vm_file->private_data; |
f17abe9a | 1400 | |
777b3f49 MT |
1401 | addr = gfn_to_hva(kvm, gfn); |
1402 | if (kvm_is_error_hva(addr)) | |
e4a533a4 | 1403 | return VM_FAULT_SIGBUS; |
777b3f49 MT |
1404 | |
1405 | npages = get_user_pages(current, current->mm, addr, 1, 1, 0, page, | |
1406 | NULL); | |
1407 | if (unlikely(npages != 1)) | |
e4a533a4 | 1408 | return VM_FAULT_SIGBUS; |
777b3f49 MT |
1409 | |
1410 | vmf->page = page[0]; | |
e4a533a4 | 1411 | return 0; |
f17abe9a AK |
1412 | } |
1413 | ||
1414 | static struct vm_operations_struct kvm_vm_vm_ops = { | |
e4a533a4 | 1415 | .fault = kvm_vm_fault, |
f17abe9a AK |
1416 | }; |
1417 | ||
1418 | static int kvm_vm_mmap(struct file *file, struct vm_area_struct *vma) | |
1419 | { | |
1420 | vma->vm_ops = &kvm_vm_vm_ops; | |
1421 | return 0; | |
1422 | } | |
1423 | ||
5c502742 | 1424 | static const struct file_operations kvm_vm_fops = { |
f17abe9a AK |
1425 | .release = kvm_vm_release, |
1426 | .unlocked_ioctl = kvm_vm_ioctl, | |
1427 | .compat_ioctl = kvm_vm_ioctl, | |
1428 | .mmap = kvm_vm_mmap, | |
1429 | }; | |
1430 | ||
1431 | static int kvm_dev_ioctl_create_vm(void) | |
1432 | { | |
2030a42c | 1433 | int fd; |
f17abe9a AK |
1434 | struct kvm *kvm; |
1435 | ||
f17abe9a | 1436 | kvm = kvm_create_vm(); |
d6d28168 AK |
1437 | if (IS_ERR(kvm)) |
1438 | return PTR_ERR(kvm); | |
7d9dbca3 | 1439 | fd = anon_inode_getfd("kvm-vm", &kvm_vm_fops, kvm, 0); |
2030a42c | 1440 | if (fd < 0) |
66c0b394 | 1441 | kvm_put_kvm(kvm); |
f17abe9a | 1442 | |
f17abe9a | 1443 | return fd; |
f17abe9a AK |
1444 | } |
1445 | ||
1446 | static long kvm_dev_ioctl(struct file *filp, | |
1447 | unsigned int ioctl, unsigned long arg) | |
1448 | { | |
07c45a36 | 1449 | long r = -EINVAL; |
f17abe9a AK |
1450 | |
1451 | switch (ioctl) { | |
1452 | case KVM_GET_API_VERSION: | |
f0fe5108 AK |
1453 | r = -EINVAL; |
1454 | if (arg) | |
1455 | goto out; | |
f17abe9a AK |
1456 | r = KVM_API_VERSION; |
1457 | break; | |
1458 | case KVM_CREATE_VM: | |
f0fe5108 AK |
1459 | r = -EINVAL; |
1460 | if (arg) | |
1461 | goto out; | |
f17abe9a AK |
1462 | r = kvm_dev_ioctl_create_vm(); |
1463 | break; | |
018d00d2 | 1464 | case KVM_CHECK_EXTENSION: |
1e1c65e0 | 1465 | r = kvm_dev_ioctl_check_extension(arg); |
5d308f45 | 1466 | break; |
07c45a36 AK |
1467 | case KVM_GET_VCPU_MMAP_SIZE: |
1468 | r = -EINVAL; | |
1469 | if (arg) | |
1470 | goto out; | |
adb1ff46 AK |
1471 | r = PAGE_SIZE; /* struct kvm_run */ |
1472 | #ifdef CONFIG_X86 | |
1473 | r += PAGE_SIZE; /* pio data page */ | |
5f94c174 LV |
1474 | #endif |
1475 | #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET | |
1476 | r += PAGE_SIZE; /* coalesced mmio ring page */ | |
adb1ff46 | 1477 | #endif |
07c45a36 | 1478 | break; |
d4c9ff2d FEL |
1479 | case KVM_TRACE_ENABLE: |
1480 | case KVM_TRACE_PAUSE: | |
1481 | case KVM_TRACE_DISABLE: | |
1482 | r = kvm_trace_ioctl(ioctl, arg); | |
1483 | break; | |
6aa8b732 | 1484 | default: |
043405e1 | 1485 | return kvm_arch_dev_ioctl(filp, ioctl, arg); |
6aa8b732 AK |
1486 | } |
1487 | out: | |
1488 | return r; | |
1489 | } | |
1490 | ||
6aa8b732 | 1491 | static struct file_operations kvm_chardev_ops = { |
6aa8b732 AK |
1492 | .unlocked_ioctl = kvm_dev_ioctl, |
1493 | .compat_ioctl = kvm_dev_ioctl, | |
6aa8b732 AK |
1494 | }; |
1495 | ||
1496 | static struct miscdevice kvm_dev = { | |
bbe4432e | 1497 | KVM_MINOR, |
6aa8b732 AK |
1498 | "kvm", |
1499 | &kvm_chardev_ops, | |
1500 | }; | |
1501 | ||
1b6c0168 AK |
1502 | static void hardware_enable(void *junk) |
1503 | { | |
1504 | int cpu = raw_smp_processor_id(); | |
1505 | ||
1506 | if (cpu_isset(cpu, cpus_hardware_enabled)) | |
1507 | return; | |
1508 | cpu_set(cpu, cpus_hardware_enabled); | |
e9b11c17 | 1509 | kvm_arch_hardware_enable(NULL); |
1b6c0168 AK |
1510 | } |
1511 | ||
1512 | static void hardware_disable(void *junk) | |
1513 | { | |
1514 | int cpu = raw_smp_processor_id(); | |
1515 | ||
1516 | if (!cpu_isset(cpu, cpus_hardware_enabled)) | |
1517 | return; | |
1518 | cpu_clear(cpu, cpus_hardware_enabled); | |
e9b11c17 | 1519 | kvm_arch_hardware_disable(NULL); |
1b6c0168 AK |
1520 | } |
1521 | ||
774c47f1 AK |
1522 | static int kvm_cpu_hotplug(struct notifier_block *notifier, unsigned long val, |
1523 | void *v) | |
1524 | { | |
1525 | int cpu = (long)v; | |
1526 | ||
1a6f4d7f | 1527 | val &= ~CPU_TASKS_FROZEN; |
774c47f1 | 1528 | switch (val) { |
cec9ad27 | 1529 | case CPU_DYING: |
6ec8a856 AK |
1530 | printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n", |
1531 | cpu); | |
1532 | hardware_disable(NULL); | |
1533 | break; | |
774c47f1 | 1534 | case CPU_UP_CANCELED: |
43934a38 JK |
1535 | printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n", |
1536 | cpu); | |
8691e5a8 | 1537 | smp_call_function_single(cpu, hardware_disable, NULL, 1); |
774c47f1 | 1538 | break; |
43934a38 JK |
1539 | case CPU_ONLINE: |
1540 | printk(KERN_INFO "kvm: enabling virtualization on CPU%d\n", | |
1541 | cpu); | |
8691e5a8 | 1542 | smp_call_function_single(cpu, hardware_enable, NULL, 1); |
774c47f1 AK |
1543 | break; |
1544 | } | |
1545 | return NOTIFY_OK; | |
1546 | } | |
1547 | ||
4ecac3fd AK |
1548 | |
1549 | asmlinkage void kvm_handle_fault_on_reboot(void) | |
1550 | { | |
1551 | if (kvm_rebooting) | |
1552 | /* spin while reset goes on */ | |
1553 | while (true) | |
1554 | ; | |
1555 | /* Fault while not rebooting. We want the trace. */ | |
1556 | BUG(); | |
1557 | } | |
1558 | EXPORT_SYMBOL_GPL(kvm_handle_fault_on_reboot); | |
1559 | ||
9a2b85c6 | 1560 | static int kvm_reboot(struct notifier_block *notifier, unsigned long val, |
d77c26fc | 1561 | void *v) |
9a2b85c6 RR |
1562 | { |
1563 | if (val == SYS_RESTART) { | |
1564 | /* | |
1565 | * Some (well, at least mine) BIOSes hang on reboot if | |
1566 | * in vmx root mode. | |
1567 | */ | |
1568 | printk(KERN_INFO "kvm: exiting hardware virtualization\n"); | |
4ecac3fd | 1569 | kvm_rebooting = true; |
15c8b6c1 | 1570 | on_each_cpu(hardware_disable, NULL, 1); |
9a2b85c6 RR |
1571 | } |
1572 | return NOTIFY_OK; | |
1573 | } | |
1574 | ||
1575 | static struct notifier_block kvm_reboot_notifier = { | |
1576 | .notifier_call = kvm_reboot, | |
1577 | .priority = 0, | |
1578 | }; | |
1579 | ||
2eeb2e94 GH |
1580 | void kvm_io_bus_init(struct kvm_io_bus *bus) |
1581 | { | |
1582 | memset(bus, 0, sizeof(*bus)); | |
1583 | } | |
1584 | ||
1585 | void kvm_io_bus_destroy(struct kvm_io_bus *bus) | |
1586 | { | |
1587 | int i; | |
1588 | ||
1589 | for (i = 0; i < bus->dev_count; i++) { | |
1590 | struct kvm_io_device *pos = bus->devs[i]; | |
1591 | ||
1592 | kvm_iodevice_destructor(pos); | |
1593 | } | |
1594 | } | |
1595 | ||
92760499 LV |
1596 | struct kvm_io_device *kvm_io_bus_find_dev(struct kvm_io_bus *bus, |
1597 | gpa_t addr, int len, int is_write) | |
2eeb2e94 GH |
1598 | { |
1599 | int i; | |
1600 | ||
1601 | for (i = 0; i < bus->dev_count; i++) { | |
1602 | struct kvm_io_device *pos = bus->devs[i]; | |
1603 | ||
92760499 | 1604 | if (pos->in_range(pos, addr, len, is_write)) |
2eeb2e94 GH |
1605 | return pos; |
1606 | } | |
1607 | ||
1608 | return NULL; | |
1609 | } | |
1610 | ||
1611 | void kvm_io_bus_register_dev(struct kvm_io_bus *bus, struct kvm_io_device *dev) | |
1612 | { | |
1613 | BUG_ON(bus->dev_count > (NR_IOBUS_DEVS-1)); | |
1614 | ||
1615 | bus->devs[bus->dev_count++] = dev; | |
1616 | } | |
1617 | ||
774c47f1 AK |
1618 | static struct notifier_block kvm_cpu_notifier = { |
1619 | .notifier_call = kvm_cpu_hotplug, | |
1620 | .priority = 20, /* must be > scheduler priority */ | |
1621 | }; | |
1622 | ||
8b88b099 | 1623 | static int vm_stat_get(void *_offset, u64 *val) |
ba1389b7 AK |
1624 | { |
1625 | unsigned offset = (long)_offset; | |
ba1389b7 AK |
1626 | struct kvm *kvm; |
1627 | ||
8b88b099 | 1628 | *val = 0; |
ba1389b7 AK |
1629 | spin_lock(&kvm_lock); |
1630 | list_for_each_entry(kvm, &vm_list, vm_list) | |
8b88b099 | 1631 | *val += *(u32 *)((void *)kvm + offset); |
ba1389b7 | 1632 | spin_unlock(&kvm_lock); |
8b88b099 | 1633 | return 0; |
ba1389b7 AK |
1634 | } |
1635 | ||
1636 | DEFINE_SIMPLE_ATTRIBUTE(vm_stat_fops, vm_stat_get, NULL, "%llu\n"); | |
1637 | ||
8b88b099 | 1638 | static int vcpu_stat_get(void *_offset, u64 *val) |
1165f5fe AK |
1639 | { |
1640 | unsigned offset = (long)_offset; | |
1165f5fe AK |
1641 | struct kvm *kvm; |
1642 | struct kvm_vcpu *vcpu; | |
1643 | int i; | |
1644 | ||
8b88b099 | 1645 | *val = 0; |
1165f5fe AK |
1646 | spin_lock(&kvm_lock); |
1647 | list_for_each_entry(kvm, &vm_list, vm_list) | |
1648 | for (i = 0; i < KVM_MAX_VCPUS; ++i) { | |
fb3f0f51 RR |
1649 | vcpu = kvm->vcpus[i]; |
1650 | if (vcpu) | |
8b88b099 | 1651 | *val += *(u32 *)((void *)vcpu + offset); |
1165f5fe AK |
1652 | } |
1653 | spin_unlock(&kvm_lock); | |
8b88b099 | 1654 | return 0; |
1165f5fe AK |
1655 | } |
1656 | ||
ba1389b7 AK |
1657 | DEFINE_SIMPLE_ATTRIBUTE(vcpu_stat_fops, vcpu_stat_get, NULL, "%llu\n"); |
1658 | ||
1659 | static struct file_operations *stat_fops[] = { | |
1660 | [KVM_STAT_VCPU] = &vcpu_stat_fops, | |
1661 | [KVM_STAT_VM] = &vm_stat_fops, | |
1662 | }; | |
1165f5fe | 1663 | |
a16b043c | 1664 | static void kvm_init_debug(void) |
6aa8b732 AK |
1665 | { |
1666 | struct kvm_stats_debugfs_item *p; | |
1667 | ||
76f7c879 | 1668 | kvm_debugfs_dir = debugfs_create_dir("kvm", NULL); |
6aa8b732 | 1669 | for (p = debugfs_entries; p->name; ++p) |
76f7c879 | 1670 | p->dentry = debugfs_create_file(p->name, 0444, kvm_debugfs_dir, |
1165f5fe | 1671 | (void *)(long)p->offset, |
ba1389b7 | 1672 | stat_fops[p->kind]); |
6aa8b732 AK |
1673 | } |
1674 | ||
1675 | static void kvm_exit_debug(void) | |
1676 | { | |
1677 | struct kvm_stats_debugfs_item *p; | |
1678 | ||
1679 | for (p = debugfs_entries; p->name; ++p) | |
1680 | debugfs_remove(p->dentry); | |
76f7c879 | 1681 | debugfs_remove(kvm_debugfs_dir); |
6aa8b732 AK |
1682 | } |
1683 | ||
59ae6c6b AK |
1684 | static int kvm_suspend(struct sys_device *dev, pm_message_t state) |
1685 | { | |
4267c41a | 1686 | hardware_disable(NULL); |
59ae6c6b AK |
1687 | return 0; |
1688 | } | |
1689 | ||
1690 | static int kvm_resume(struct sys_device *dev) | |
1691 | { | |
4267c41a | 1692 | hardware_enable(NULL); |
59ae6c6b AK |
1693 | return 0; |
1694 | } | |
1695 | ||
1696 | static struct sysdev_class kvm_sysdev_class = { | |
af5ca3f4 | 1697 | .name = "kvm", |
59ae6c6b AK |
1698 | .suspend = kvm_suspend, |
1699 | .resume = kvm_resume, | |
1700 | }; | |
1701 | ||
1702 | static struct sys_device kvm_sysdev = { | |
1703 | .id = 0, | |
1704 | .cls = &kvm_sysdev_class, | |
1705 | }; | |
1706 | ||
cea7bb21 | 1707 | struct page *bad_page; |
35149e21 | 1708 | pfn_t bad_pfn; |
6aa8b732 | 1709 | |
15ad7146 AK |
1710 | static inline |
1711 | struct kvm_vcpu *preempt_notifier_to_vcpu(struct preempt_notifier *pn) | |
1712 | { | |
1713 | return container_of(pn, struct kvm_vcpu, preempt_notifier); | |
1714 | } | |
1715 | ||
1716 | static void kvm_sched_in(struct preempt_notifier *pn, int cpu) | |
1717 | { | |
1718 | struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn); | |
1719 | ||
e9b11c17 | 1720 | kvm_arch_vcpu_load(vcpu, cpu); |
15ad7146 AK |
1721 | } |
1722 | ||
1723 | static void kvm_sched_out(struct preempt_notifier *pn, | |
1724 | struct task_struct *next) | |
1725 | { | |
1726 | struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn); | |
1727 | ||
e9b11c17 | 1728 | kvm_arch_vcpu_put(vcpu); |
15ad7146 AK |
1729 | } |
1730 | ||
f8c16bba | 1731 | int kvm_init(void *opaque, unsigned int vcpu_size, |
c16f862d | 1732 | struct module *module) |
6aa8b732 AK |
1733 | { |
1734 | int r; | |
002c7f7c | 1735 | int cpu; |
6aa8b732 | 1736 | |
cb498ea2 ZX |
1737 | kvm_init_debug(); |
1738 | ||
f8c16bba ZX |
1739 | r = kvm_arch_init(opaque); |
1740 | if (r) | |
d2308784 | 1741 | goto out_fail; |
cb498ea2 ZX |
1742 | |
1743 | bad_page = alloc_page(GFP_KERNEL | __GFP_ZERO); | |
1744 | ||
1745 | if (bad_page == NULL) { | |
1746 | r = -ENOMEM; | |
1747 | goto out; | |
1748 | } | |
1749 | ||
35149e21 AL |
1750 | bad_pfn = page_to_pfn(bad_page); |
1751 | ||
e9b11c17 | 1752 | r = kvm_arch_hardware_setup(); |
6aa8b732 | 1753 | if (r < 0) |
d2308784 | 1754 | goto out_free_0; |
6aa8b732 | 1755 | |
002c7f7c YS |
1756 | for_each_online_cpu(cpu) { |
1757 | smp_call_function_single(cpu, | |
e9b11c17 | 1758 | kvm_arch_check_processor_compat, |
8691e5a8 | 1759 | &r, 1); |
002c7f7c | 1760 | if (r < 0) |
d2308784 | 1761 | goto out_free_1; |
002c7f7c YS |
1762 | } |
1763 | ||
15c8b6c1 | 1764 | on_each_cpu(hardware_enable, NULL, 1); |
774c47f1 AK |
1765 | r = register_cpu_notifier(&kvm_cpu_notifier); |
1766 | if (r) | |
d2308784 | 1767 | goto out_free_2; |
6aa8b732 AK |
1768 | register_reboot_notifier(&kvm_reboot_notifier); |
1769 | ||
59ae6c6b AK |
1770 | r = sysdev_class_register(&kvm_sysdev_class); |
1771 | if (r) | |
d2308784 | 1772 | goto out_free_3; |
59ae6c6b AK |
1773 | |
1774 | r = sysdev_register(&kvm_sysdev); | |
1775 | if (r) | |
d2308784 | 1776 | goto out_free_4; |
59ae6c6b | 1777 | |
c16f862d RR |
1778 | /* A kmem cache lets us meet the alignment requirements of fx_save. */ |
1779 | kvm_vcpu_cache = kmem_cache_create("kvm_vcpu", vcpu_size, | |
56919c5c JP |
1780 | __alignof__(struct kvm_vcpu), |
1781 | 0, NULL); | |
c16f862d RR |
1782 | if (!kvm_vcpu_cache) { |
1783 | r = -ENOMEM; | |
d2308784 | 1784 | goto out_free_5; |
c16f862d RR |
1785 | } |
1786 | ||
6aa8b732 AK |
1787 | kvm_chardev_ops.owner = module; |
1788 | ||
1789 | r = misc_register(&kvm_dev); | |
1790 | if (r) { | |
d77c26fc | 1791 | printk(KERN_ERR "kvm: misc device register failed\n"); |
6aa8b732 AK |
1792 | goto out_free; |
1793 | } | |
1794 | ||
15ad7146 AK |
1795 | kvm_preempt_ops.sched_in = kvm_sched_in; |
1796 | kvm_preempt_ops.sched_out = kvm_sched_out; | |
1797 | ||
c7addb90 | 1798 | return 0; |
6aa8b732 AK |
1799 | |
1800 | out_free: | |
c16f862d | 1801 | kmem_cache_destroy(kvm_vcpu_cache); |
d2308784 | 1802 | out_free_5: |
59ae6c6b | 1803 | sysdev_unregister(&kvm_sysdev); |
d2308784 | 1804 | out_free_4: |
59ae6c6b | 1805 | sysdev_class_unregister(&kvm_sysdev_class); |
d2308784 | 1806 | out_free_3: |
6aa8b732 | 1807 | unregister_reboot_notifier(&kvm_reboot_notifier); |
774c47f1 | 1808 | unregister_cpu_notifier(&kvm_cpu_notifier); |
d2308784 | 1809 | out_free_2: |
15c8b6c1 | 1810 | on_each_cpu(hardware_disable, NULL, 1); |
d2308784 | 1811 | out_free_1: |
e9b11c17 | 1812 | kvm_arch_hardware_unsetup(); |
d2308784 ZX |
1813 | out_free_0: |
1814 | __free_page(bad_page); | |
ca45aaae | 1815 | out: |
f8c16bba | 1816 | kvm_arch_exit(); |
cb498ea2 | 1817 | kvm_exit_debug(); |
d2308784 | 1818 | out_fail: |
6aa8b732 AK |
1819 | return r; |
1820 | } | |
cb498ea2 | 1821 | EXPORT_SYMBOL_GPL(kvm_init); |
6aa8b732 | 1822 | |
cb498ea2 | 1823 | void kvm_exit(void) |
6aa8b732 | 1824 | { |
d4c9ff2d | 1825 | kvm_trace_cleanup(); |
6aa8b732 | 1826 | misc_deregister(&kvm_dev); |
c16f862d | 1827 | kmem_cache_destroy(kvm_vcpu_cache); |
59ae6c6b AK |
1828 | sysdev_unregister(&kvm_sysdev); |
1829 | sysdev_class_unregister(&kvm_sysdev_class); | |
6aa8b732 | 1830 | unregister_reboot_notifier(&kvm_reboot_notifier); |
59ae6c6b | 1831 | unregister_cpu_notifier(&kvm_cpu_notifier); |
15c8b6c1 | 1832 | on_each_cpu(hardware_disable, NULL, 1); |
e9b11c17 | 1833 | kvm_arch_hardware_unsetup(); |
f8c16bba | 1834 | kvm_arch_exit(); |
6aa8b732 | 1835 | kvm_exit_debug(); |
cea7bb21 | 1836 | __free_page(bad_page); |
6aa8b732 | 1837 | } |
cb498ea2 | 1838 | EXPORT_SYMBOL_GPL(kvm_exit); |