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Commit | Line | Data |
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6aa8b732 AK |
1 | /* |
2 | * Kernel-based Virtual Machine driver for Linux | |
3 | * | |
4 | * This module enables machines with Intel VT-x extensions to run virtual | |
5 | * machines without emulation or binary translation. | |
6 | * | |
7 | * Copyright (C) 2006 Qumranet, Inc. | |
9611c187 | 8 | * Copyright 2010 Red Hat, Inc. and/or its affiliates. |
6aa8b732 AK |
9 | * |
10 | * Authors: | |
11 | * Avi Kivity <avi@qumranet.com> | |
12 | * Yaniv Kamay <yaniv@qumranet.com> | |
13 | * | |
14 | * This work is licensed under the terms of the GNU GPL, version 2. See | |
15 | * the COPYING file in the top-level directory. | |
16 | * | |
17 | */ | |
18 | ||
af669ac6 | 19 | #include <kvm/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> |
174cd4b1 | 35 | #include <linux/sched/signal.h> |
6e84f315 | 36 | #include <linux/sched/mm.h> |
03441a34 | 37 | #include <linux/sched/stat.h> |
d9e368d6 AK |
38 | #include <linux/cpumask.h> |
39 | #include <linux/smp.h> | |
d6d28168 | 40 | #include <linux/anon_inodes.h> |
04d2cc77 | 41 | #include <linux/profile.h> |
7aa81cc0 | 42 | #include <linux/kvm_para.h> |
6fc138d2 | 43 | #include <linux/pagemap.h> |
8d4e1288 | 44 | #include <linux/mman.h> |
35149e21 | 45 | #include <linux/swap.h> |
e56d532f | 46 | #include <linux/bitops.h> |
547de29e | 47 | #include <linux/spinlock.h> |
6ff5894c | 48 | #include <linux/compat.h> |
bc6678a3 | 49 | #include <linux/srcu.h> |
8f0b1ab6 | 50 | #include <linux/hugetlb.h> |
5a0e3ad6 | 51 | #include <linux/slab.h> |
743eeb0b SL |
52 | #include <linux/sort.h> |
53 | #include <linux/bsearch.h> | |
6aa8b732 | 54 | |
e495606d | 55 | #include <asm/processor.h> |
e495606d | 56 | #include <asm/io.h> |
2ea75be3 | 57 | #include <asm/ioctl.h> |
7c0f6ba6 | 58 | #include <linux/uaccess.h> |
3e021bf5 | 59 | #include <asm/pgtable.h> |
6aa8b732 | 60 | |
5f94c174 | 61 | #include "coalesced_mmio.h" |
af585b92 | 62 | #include "async_pf.h" |
3c3c29fd | 63 | #include "vfio.h" |
5f94c174 | 64 | |
229456fc MT |
65 | #define CREATE_TRACE_POINTS |
66 | #include <trace/events/kvm.h> | |
67 | ||
536a6f88 JF |
68 | /* Worst case buffer size needed for holding an integer. */ |
69 | #define ITOA_MAX_LEN 12 | |
70 | ||
6aa8b732 AK |
71 | MODULE_AUTHOR("Qumranet"); |
72 | MODULE_LICENSE("GPL"); | |
73 | ||
920552b2 | 74 | /* Architectures should define their poll value according to the halt latency */ |
ec76d819 | 75 | unsigned int halt_poll_ns = KVM_HALT_POLL_NS_DEFAULT; |
039c5d1b | 76 | module_param(halt_poll_ns, uint, 0644); |
ec76d819 | 77 | EXPORT_SYMBOL_GPL(halt_poll_ns); |
f7819512 | 78 | |
aca6ff29 | 79 | /* Default doubles per-vcpu halt_poll_ns. */ |
ec76d819 | 80 | unsigned int halt_poll_ns_grow = 2; |
039c5d1b | 81 | module_param(halt_poll_ns_grow, uint, 0644); |
ec76d819 | 82 | EXPORT_SYMBOL_GPL(halt_poll_ns_grow); |
aca6ff29 WL |
83 | |
84 | /* Default resets per-vcpu halt_poll_ns . */ | |
ec76d819 | 85 | unsigned int halt_poll_ns_shrink; |
039c5d1b | 86 | module_param(halt_poll_ns_shrink, uint, 0644); |
ec76d819 | 87 | EXPORT_SYMBOL_GPL(halt_poll_ns_shrink); |
aca6ff29 | 88 | |
fa40a821 MT |
89 | /* |
90 | * Ordering of locks: | |
91 | * | |
b7d409de | 92 | * kvm->lock --> kvm->slots_lock --> kvm->irq_lock |
fa40a821 MT |
93 | */ |
94 | ||
2f303b74 | 95 | DEFINE_SPINLOCK(kvm_lock); |
4a937f96 | 96 | static DEFINE_RAW_SPINLOCK(kvm_count_lock); |
e9b11c17 | 97 | LIST_HEAD(vm_list); |
133de902 | 98 | |
7f59f492 | 99 | static cpumask_var_t cpus_hardware_enabled; |
f4fee932 | 100 | static int kvm_usage_count; |
10474ae8 | 101 | static atomic_t hardware_enable_failed; |
1b6c0168 | 102 | |
c16f862d RR |
103 | struct kmem_cache *kvm_vcpu_cache; |
104 | EXPORT_SYMBOL_GPL(kvm_vcpu_cache); | |
1165f5fe | 105 | |
15ad7146 AK |
106 | static __read_mostly struct preempt_ops kvm_preempt_ops; |
107 | ||
76f7c879 | 108 | struct dentry *kvm_debugfs_dir; |
e23a808b | 109 | EXPORT_SYMBOL_GPL(kvm_debugfs_dir); |
6aa8b732 | 110 | |
536a6f88 JF |
111 | static int kvm_debugfs_num_entries; |
112 | static const struct file_operations *stat_fops_per_vm[]; | |
113 | ||
bccf2150 AK |
114 | static long kvm_vcpu_ioctl(struct file *file, unsigned int ioctl, |
115 | unsigned long arg); | |
de8e5d74 | 116 | #ifdef CONFIG_KVM_COMPAT |
1dda606c AG |
117 | static long kvm_vcpu_compat_ioctl(struct file *file, unsigned int ioctl, |
118 | unsigned long arg); | |
7ddfd3e0 MZ |
119 | #define KVM_COMPAT(c) .compat_ioctl = (c) |
120 | #else | |
121 | static long kvm_no_compat_ioctl(struct file *file, unsigned int ioctl, | |
122 | unsigned long arg) { return -EINVAL; } | |
123 | #define KVM_COMPAT(c) .compat_ioctl = kvm_no_compat_ioctl | |
1dda606c | 124 | #endif |
10474ae8 AG |
125 | static int hardware_enable_all(void); |
126 | static void hardware_disable_all(void); | |
bccf2150 | 127 | |
e93f8a0f | 128 | static void kvm_io_bus_destroy(struct kvm_io_bus *bus); |
7940876e | 129 | |
bc009e43 | 130 | static void mark_page_dirty_in_slot(struct kvm_memory_slot *memslot, gfn_t gfn); |
e93f8a0f | 131 | |
52480137 | 132 | __visible bool kvm_rebooting; |
b7c4145b | 133 | EXPORT_SYMBOL_GPL(kvm_rebooting); |
4ecac3fd | 134 | |
54dee993 MT |
135 | static bool largepages_enabled = true; |
136 | ||
286de8f6 CI |
137 | #define KVM_EVENT_CREATE_VM 0 |
138 | #define KVM_EVENT_DESTROY_VM 1 | |
139 | static void kvm_uevent_notify_change(unsigned int type, struct kvm *kvm); | |
140 | static unsigned long long kvm_createvm_count; | |
141 | static unsigned long long kvm_active_vms; | |
142 | ||
93065ac7 MH |
143 | __weak int kvm_arch_mmu_notifier_invalidate_range(struct kvm *kvm, |
144 | unsigned long start, unsigned long end, bool blockable) | |
b1394e74 | 145 | { |
93065ac7 | 146 | return 0; |
b1394e74 RK |
147 | } |
148 | ||
ba049e93 | 149 | bool kvm_is_reserved_pfn(kvm_pfn_t pfn) |
cbff90a7 | 150 | { |
11feeb49 | 151 | if (pfn_valid(pfn)) |
bf4bea8e | 152 | return PageReserved(pfn_to_page(pfn)); |
cbff90a7 BAY |
153 | |
154 | return true; | |
155 | } | |
156 | ||
bccf2150 AK |
157 | /* |
158 | * Switches to specified vcpu, until a matching vcpu_put() | |
159 | */ | |
ec7660cc | 160 | void vcpu_load(struct kvm_vcpu *vcpu) |
6aa8b732 | 161 | { |
ec7660cc | 162 | int cpu = get_cpu(); |
15ad7146 | 163 | preempt_notifier_register(&vcpu->preempt_notifier); |
313a3dc7 | 164 | kvm_arch_vcpu_load(vcpu, cpu); |
15ad7146 | 165 | put_cpu(); |
6aa8b732 | 166 | } |
2f1fe811 | 167 | EXPORT_SYMBOL_GPL(vcpu_load); |
6aa8b732 | 168 | |
313a3dc7 | 169 | void vcpu_put(struct kvm_vcpu *vcpu) |
6aa8b732 | 170 | { |
15ad7146 | 171 | preempt_disable(); |
313a3dc7 | 172 | kvm_arch_vcpu_put(vcpu); |
15ad7146 AK |
173 | preempt_notifier_unregister(&vcpu->preempt_notifier); |
174 | preempt_enable(); | |
6aa8b732 | 175 | } |
2f1fe811 | 176 | EXPORT_SYMBOL_GPL(vcpu_put); |
6aa8b732 | 177 | |
7a97cec2 PB |
178 | /* TODO: merge with kvm_arch_vcpu_should_kick */ |
179 | static bool kvm_request_needs_ipi(struct kvm_vcpu *vcpu, unsigned req) | |
180 | { | |
181 | int mode = kvm_vcpu_exiting_guest_mode(vcpu); | |
182 | ||
183 | /* | |
184 | * We need to wait for the VCPU to reenable interrupts and get out of | |
185 | * READING_SHADOW_PAGE_TABLES mode. | |
186 | */ | |
187 | if (req & KVM_REQUEST_WAIT) | |
188 | return mode != OUTSIDE_GUEST_MODE; | |
189 | ||
190 | /* | |
191 | * Need to kick a running VCPU, but otherwise there is nothing to do. | |
192 | */ | |
193 | return mode == IN_GUEST_MODE; | |
194 | } | |
195 | ||
d9e368d6 AK |
196 | static void ack_flush(void *_completed) |
197 | { | |
d9e368d6 AK |
198 | } |
199 | ||
b49defe8 PB |
200 | static inline bool kvm_kick_many_cpus(const struct cpumask *cpus, bool wait) |
201 | { | |
202 | if (unlikely(!cpus)) | |
203 | cpus = cpu_online_mask; | |
204 | ||
205 | if (cpumask_empty(cpus)) | |
206 | return false; | |
207 | ||
208 | smp_call_function_many(cpus, ack_flush, NULL, wait); | |
209 | return true; | |
210 | } | |
211 | ||
7053df4e VK |
212 | bool kvm_make_vcpus_request_mask(struct kvm *kvm, unsigned int req, |
213 | unsigned long *vcpu_bitmap, cpumask_var_t tmp) | |
d9e368d6 | 214 | { |
597a5f55 | 215 | int i, cpu, me; |
d9e368d6 | 216 | struct kvm_vcpu *vcpu; |
7053df4e | 217 | bool called; |
6ef7a1bc | 218 | |
3cba4130 | 219 | me = get_cpu(); |
7053df4e | 220 | |
988a2cae | 221 | kvm_for_each_vcpu(i, vcpu, kvm) { |
a812297c | 222 | if (vcpu_bitmap && !test_bit(i, vcpu_bitmap)) |
7053df4e VK |
223 | continue; |
224 | ||
3cba4130 | 225 | kvm_make_request(req, vcpu); |
d9e368d6 | 226 | cpu = vcpu->cpu; |
6b7e2d09 | 227 | |
178f02ff RK |
228 | if (!(req & KVM_REQUEST_NO_WAKEUP) && kvm_vcpu_wake_up(vcpu)) |
229 | continue; | |
6c6e8360 | 230 | |
7053df4e | 231 | if (tmp != NULL && cpu != -1 && cpu != me && |
7a97cec2 | 232 | kvm_request_needs_ipi(vcpu, req)) |
7053df4e | 233 | __cpumask_set_cpu(cpu, tmp); |
49846896 | 234 | } |
7053df4e VK |
235 | |
236 | called = kvm_kick_many_cpus(tmp, !!(req & KVM_REQUEST_WAIT)); | |
3cba4130 | 237 | put_cpu(); |
7053df4e VK |
238 | |
239 | return called; | |
240 | } | |
241 | ||
242 | bool kvm_make_all_cpus_request(struct kvm *kvm, unsigned int req) | |
243 | { | |
244 | cpumask_var_t cpus; | |
245 | bool called; | |
7053df4e VK |
246 | |
247 | zalloc_cpumask_var(&cpus, GFP_ATOMIC); | |
248 | ||
a812297c | 249 | called = kvm_make_vcpus_request_mask(kvm, req, NULL, cpus); |
7053df4e | 250 | |
6ef7a1bc | 251 | free_cpumask_var(cpus); |
49846896 | 252 | return called; |
d9e368d6 AK |
253 | } |
254 | ||
a6d51016 | 255 | #ifndef CONFIG_HAVE_KVM_ARCH_TLB_FLUSH_ALL |
49846896 | 256 | void kvm_flush_remote_tlbs(struct kvm *kvm) |
2e53d63a | 257 | { |
4ae3cb3a LT |
258 | /* |
259 | * Read tlbs_dirty before setting KVM_REQ_TLB_FLUSH in | |
260 | * kvm_make_all_cpus_request. | |
261 | */ | |
262 | long dirty_count = smp_load_acquire(&kvm->tlbs_dirty); | |
263 | ||
264 | /* | |
265 | * We want to publish modifications to the page tables before reading | |
266 | * mode. Pairs with a memory barrier in arch-specific code. | |
267 | * - x86: smp_mb__after_srcu_read_unlock in vcpu_enter_guest | |
268 | * and smp_mb in walk_shadow_page_lockless_begin/end. | |
269 | * - powerpc: smp_mb in kvmppc_prepare_to_enter. | |
270 | * | |
271 | * There is already an smp_mb__after_atomic() before | |
272 | * kvm_make_all_cpus_request() reads vcpu->mode. We reuse that | |
273 | * barrier here. | |
274 | */ | |
b08660e5 TL |
275 | if (!kvm_arch_flush_remote_tlb(kvm) |
276 | || kvm_make_all_cpus_request(kvm, KVM_REQ_TLB_FLUSH)) | |
49846896 | 277 | ++kvm->stat.remote_tlb_flush; |
a086f6a1 | 278 | cmpxchg(&kvm->tlbs_dirty, dirty_count, 0); |
2e53d63a | 279 | } |
2ba9f0d8 | 280 | EXPORT_SYMBOL_GPL(kvm_flush_remote_tlbs); |
a6d51016 | 281 | #endif |
2e53d63a | 282 | |
49846896 RR |
283 | void kvm_reload_remote_mmus(struct kvm *kvm) |
284 | { | |
445b8236 | 285 | kvm_make_all_cpus_request(kvm, KVM_REQ_MMU_RELOAD); |
49846896 | 286 | } |
2e53d63a | 287 | |
fb3f0f51 RR |
288 | int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id) |
289 | { | |
290 | struct page *page; | |
291 | int r; | |
292 | ||
293 | mutex_init(&vcpu->mutex); | |
294 | vcpu->cpu = -1; | |
fb3f0f51 RR |
295 | vcpu->kvm = kvm; |
296 | vcpu->vcpu_id = id; | |
34bb10b7 | 297 | vcpu->pid = NULL; |
8577370f | 298 | init_swait_queue_head(&vcpu->wq); |
af585b92 | 299 | kvm_async_pf_vcpu_init(vcpu); |
fb3f0f51 | 300 | |
bf9f6ac8 FW |
301 | vcpu->pre_pcpu = -1; |
302 | INIT_LIST_HEAD(&vcpu->blocked_vcpu_list); | |
303 | ||
fb3f0f51 RR |
304 | page = alloc_page(GFP_KERNEL | __GFP_ZERO); |
305 | if (!page) { | |
306 | r = -ENOMEM; | |
307 | goto fail; | |
308 | } | |
309 | vcpu->run = page_address(page); | |
310 | ||
4c088493 R |
311 | kvm_vcpu_set_in_spin_loop(vcpu, false); |
312 | kvm_vcpu_set_dy_eligible(vcpu, false); | |
3a08a8f9 | 313 | vcpu->preempted = false; |
4c088493 | 314 | |
e9b11c17 | 315 | r = kvm_arch_vcpu_init(vcpu); |
fb3f0f51 | 316 | if (r < 0) |
e9b11c17 | 317 | goto fail_free_run; |
fb3f0f51 RR |
318 | return 0; |
319 | ||
fb3f0f51 RR |
320 | fail_free_run: |
321 | free_page((unsigned long)vcpu->run); | |
322 | fail: | |
76fafa5e | 323 | return r; |
fb3f0f51 RR |
324 | } |
325 | EXPORT_SYMBOL_GPL(kvm_vcpu_init); | |
326 | ||
327 | void kvm_vcpu_uninit(struct kvm_vcpu *vcpu) | |
328 | { | |
0e4524a5 CB |
329 | /* |
330 | * no need for rcu_read_lock as VCPU_RUN is the only place that | |
331 | * will change the vcpu->pid pointer and on uninit all file | |
332 | * descriptors are already gone. | |
333 | */ | |
334 | put_pid(rcu_dereference_protected(vcpu->pid, 1)); | |
e9b11c17 | 335 | kvm_arch_vcpu_uninit(vcpu); |
fb3f0f51 RR |
336 | free_page((unsigned long)vcpu->run); |
337 | } | |
338 | EXPORT_SYMBOL_GPL(kvm_vcpu_uninit); | |
339 | ||
e930bffe AA |
340 | #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER) |
341 | static inline struct kvm *mmu_notifier_to_kvm(struct mmu_notifier *mn) | |
342 | { | |
343 | return container_of(mn, struct kvm, mmu_notifier); | |
344 | } | |
345 | ||
3da0dd43 IE |
346 | static void kvm_mmu_notifier_change_pte(struct mmu_notifier *mn, |
347 | struct mm_struct *mm, | |
348 | unsigned long address, | |
349 | pte_t pte) | |
350 | { | |
351 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
bc6678a3 | 352 | int idx; |
3da0dd43 | 353 | |
bc6678a3 | 354 | idx = srcu_read_lock(&kvm->srcu); |
3da0dd43 IE |
355 | spin_lock(&kvm->mmu_lock); |
356 | kvm->mmu_notifier_seq++; | |
0cf853c5 LT |
357 | |
358 | if (kvm_set_spte_hva(kvm, address, pte)) | |
359 | kvm_flush_remote_tlbs(kvm); | |
360 | ||
3da0dd43 | 361 | spin_unlock(&kvm->mmu_lock); |
bc6678a3 | 362 | srcu_read_unlock(&kvm->srcu, idx); |
3da0dd43 IE |
363 | } |
364 | ||
93065ac7 | 365 | static int kvm_mmu_notifier_invalidate_range_start(struct mmu_notifier *mn, |
5d6527a7 | 366 | const struct mmu_notifier_range *range) |
e930bffe AA |
367 | { |
368 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
bc6678a3 | 369 | int need_tlb_flush = 0, idx; |
93065ac7 | 370 | int ret; |
e930bffe | 371 | |
bc6678a3 | 372 | idx = srcu_read_lock(&kvm->srcu); |
e930bffe AA |
373 | spin_lock(&kvm->mmu_lock); |
374 | /* | |
375 | * The count increase must become visible at unlock time as no | |
376 | * spte can be established without taking the mmu_lock and | |
377 | * count is also read inside the mmu_lock critical section. | |
378 | */ | |
379 | kvm->mmu_notifier_count++; | |
5d6527a7 | 380 | need_tlb_flush = kvm_unmap_hva_range(kvm, range->start, range->end); |
a4ee1ca4 | 381 | need_tlb_flush |= kvm->tlbs_dirty; |
e930bffe AA |
382 | /* we've to flush the tlb before the pages can be freed */ |
383 | if (need_tlb_flush) | |
384 | kvm_flush_remote_tlbs(kvm); | |
565f3be2 TY |
385 | |
386 | spin_unlock(&kvm->mmu_lock); | |
b1394e74 | 387 | |
5d6527a7 JG |
388 | ret = kvm_arch_mmu_notifier_invalidate_range(kvm, range->start, |
389 | range->end, range->blockable); | |
b1394e74 | 390 | |
565f3be2 | 391 | srcu_read_unlock(&kvm->srcu, idx); |
93065ac7 MH |
392 | |
393 | return ret; | |
e930bffe AA |
394 | } |
395 | ||
396 | static void kvm_mmu_notifier_invalidate_range_end(struct mmu_notifier *mn, | |
5d6527a7 | 397 | const struct mmu_notifier_range *range) |
e930bffe AA |
398 | { |
399 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
400 | ||
401 | spin_lock(&kvm->mmu_lock); | |
402 | /* | |
403 | * This sequence increase will notify the kvm page fault that | |
404 | * the page that is going to be mapped in the spte could have | |
405 | * been freed. | |
406 | */ | |
407 | kvm->mmu_notifier_seq++; | |
a355aa54 | 408 | smp_wmb(); |
e930bffe AA |
409 | /* |
410 | * The above sequence increase must be visible before the | |
a355aa54 PM |
411 | * below count decrease, which is ensured by the smp_wmb above |
412 | * in conjunction with the smp_rmb in mmu_notifier_retry(). | |
e930bffe AA |
413 | */ |
414 | kvm->mmu_notifier_count--; | |
415 | spin_unlock(&kvm->mmu_lock); | |
416 | ||
417 | BUG_ON(kvm->mmu_notifier_count < 0); | |
418 | } | |
419 | ||
420 | static int kvm_mmu_notifier_clear_flush_young(struct mmu_notifier *mn, | |
421 | struct mm_struct *mm, | |
57128468 ALC |
422 | unsigned long start, |
423 | unsigned long end) | |
e930bffe AA |
424 | { |
425 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
bc6678a3 | 426 | int young, idx; |
e930bffe | 427 | |
bc6678a3 | 428 | idx = srcu_read_lock(&kvm->srcu); |
e930bffe | 429 | spin_lock(&kvm->mmu_lock); |
e930bffe | 430 | |
57128468 | 431 | young = kvm_age_hva(kvm, start, end); |
e930bffe AA |
432 | if (young) |
433 | kvm_flush_remote_tlbs(kvm); | |
434 | ||
565f3be2 TY |
435 | spin_unlock(&kvm->mmu_lock); |
436 | srcu_read_unlock(&kvm->srcu, idx); | |
437 | ||
e930bffe AA |
438 | return young; |
439 | } | |
440 | ||
1d7715c6 VD |
441 | static int kvm_mmu_notifier_clear_young(struct mmu_notifier *mn, |
442 | struct mm_struct *mm, | |
443 | unsigned long start, | |
444 | unsigned long end) | |
445 | { | |
446 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
447 | int young, idx; | |
448 | ||
449 | idx = srcu_read_lock(&kvm->srcu); | |
450 | spin_lock(&kvm->mmu_lock); | |
451 | /* | |
452 | * Even though we do not flush TLB, this will still adversely | |
453 | * affect performance on pre-Haswell Intel EPT, where there is | |
454 | * no EPT Access Bit to clear so that we have to tear down EPT | |
455 | * tables instead. If we find this unacceptable, we can always | |
456 | * add a parameter to kvm_age_hva so that it effectively doesn't | |
457 | * do anything on clear_young. | |
458 | * | |
459 | * Also note that currently we never issue secondary TLB flushes | |
460 | * from clear_young, leaving this job up to the regular system | |
461 | * cadence. If we find this inaccurate, we might come up with a | |
462 | * more sophisticated heuristic later. | |
463 | */ | |
464 | young = kvm_age_hva(kvm, start, end); | |
465 | spin_unlock(&kvm->mmu_lock); | |
466 | srcu_read_unlock(&kvm->srcu, idx); | |
467 | ||
468 | return young; | |
469 | } | |
470 | ||
8ee53820 AA |
471 | static int kvm_mmu_notifier_test_young(struct mmu_notifier *mn, |
472 | struct mm_struct *mm, | |
473 | unsigned long address) | |
474 | { | |
475 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
476 | int young, idx; | |
477 | ||
478 | idx = srcu_read_lock(&kvm->srcu); | |
479 | spin_lock(&kvm->mmu_lock); | |
480 | young = kvm_test_age_hva(kvm, address); | |
481 | spin_unlock(&kvm->mmu_lock); | |
482 | srcu_read_unlock(&kvm->srcu, idx); | |
483 | ||
484 | return young; | |
485 | } | |
486 | ||
85db06e5 MT |
487 | static void kvm_mmu_notifier_release(struct mmu_notifier *mn, |
488 | struct mm_struct *mm) | |
489 | { | |
490 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
eda2beda LJ |
491 | int idx; |
492 | ||
493 | idx = srcu_read_lock(&kvm->srcu); | |
2df72e9b | 494 | kvm_arch_flush_shadow_all(kvm); |
eda2beda | 495 | srcu_read_unlock(&kvm->srcu, idx); |
85db06e5 MT |
496 | } |
497 | ||
e930bffe | 498 | static const struct mmu_notifier_ops kvm_mmu_notifier_ops = { |
e930bffe AA |
499 | .invalidate_range_start = kvm_mmu_notifier_invalidate_range_start, |
500 | .invalidate_range_end = kvm_mmu_notifier_invalidate_range_end, | |
501 | .clear_flush_young = kvm_mmu_notifier_clear_flush_young, | |
1d7715c6 | 502 | .clear_young = kvm_mmu_notifier_clear_young, |
8ee53820 | 503 | .test_young = kvm_mmu_notifier_test_young, |
3da0dd43 | 504 | .change_pte = kvm_mmu_notifier_change_pte, |
85db06e5 | 505 | .release = kvm_mmu_notifier_release, |
e930bffe | 506 | }; |
4c07b0a4 AK |
507 | |
508 | static int kvm_init_mmu_notifier(struct kvm *kvm) | |
509 | { | |
510 | kvm->mmu_notifier.ops = &kvm_mmu_notifier_ops; | |
511 | return mmu_notifier_register(&kvm->mmu_notifier, current->mm); | |
512 | } | |
513 | ||
514 | #else /* !(CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER) */ | |
515 | ||
516 | static int kvm_init_mmu_notifier(struct kvm *kvm) | |
517 | { | |
518 | return 0; | |
519 | } | |
520 | ||
e930bffe AA |
521 | #endif /* CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER */ |
522 | ||
a47d2b07 | 523 | static struct kvm_memslots *kvm_alloc_memslots(void) |
bf3e05bc XG |
524 | { |
525 | int i; | |
a47d2b07 | 526 | struct kvm_memslots *slots; |
bf3e05bc | 527 | |
b12ce36a | 528 | slots = kvzalloc(sizeof(struct kvm_memslots), GFP_KERNEL_ACCOUNT); |
a47d2b07 PB |
529 | if (!slots) |
530 | return NULL; | |
531 | ||
bf3e05bc | 532 | for (i = 0; i < KVM_MEM_SLOTS_NUM; i++) |
f85e2cb5 | 533 | slots->id_to_index[i] = slots->memslots[i].id = i; |
a47d2b07 PB |
534 | |
535 | return slots; | |
536 | } | |
537 | ||
538 | static void kvm_destroy_dirty_bitmap(struct kvm_memory_slot *memslot) | |
539 | { | |
540 | if (!memslot->dirty_bitmap) | |
541 | return; | |
542 | ||
543 | kvfree(memslot->dirty_bitmap); | |
544 | memslot->dirty_bitmap = NULL; | |
545 | } | |
546 | ||
547 | /* | |
548 | * Free any memory in @free but not in @dont. | |
549 | */ | |
550 | static void kvm_free_memslot(struct kvm *kvm, struct kvm_memory_slot *free, | |
551 | struct kvm_memory_slot *dont) | |
552 | { | |
553 | if (!dont || free->dirty_bitmap != dont->dirty_bitmap) | |
554 | kvm_destroy_dirty_bitmap(free); | |
555 | ||
556 | kvm_arch_free_memslot(kvm, free, dont); | |
557 | ||
558 | free->npages = 0; | |
559 | } | |
560 | ||
561 | static void kvm_free_memslots(struct kvm *kvm, struct kvm_memslots *slots) | |
562 | { | |
563 | struct kvm_memory_slot *memslot; | |
564 | ||
565 | if (!slots) | |
566 | return; | |
567 | ||
568 | kvm_for_each_memslot(memslot, slots) | |
569 | kvm_free_memslot(kvm, memslot, NULL); | |
570 | ||
571 | kvfree(slots); | |
bf3e05bc XG |
572 | } |
573 | ||
536a6f88 JF |
574 | static void kvm_destroy_vm_debugfs(struct kvm *kvm) |
575 | { | |
576 | int i; | |
577 | ||
578 | if (!kvm->debugfs_dentry) | |
579 | return; | |
580 | ||
581 | debugfs_remove_recursive(kvm->debugfs_dentry); | |
582 | ||
9d5a1dce LC |
583 | if (kvm->debugfs_stat_data) { |
584 | for (i = 0; i < kvm_debugfs_num_entries; i++) | |
585 | kfree(kvm->debugfs_stat_data[i]); | |
586 | kfree(kvm->debugfs_stat_data); | |
587 | } | |
536a6f88 JF |
588 | } |
589 | ||
590 | static int kvm_create_vm_debugfs(struct kvm *kvm, int fd) | |
591 | { | |
592 | char dir_name[ITOA_MAX_LEN * 2]; | |
593 | struct kvm_stat_data *stat_data; | |
594 | struct kvm_stats_debugfs_item *p; | |
595 | ||
596 | if (!debugfs_initialized()) | |
597 | return 0; | |
598 | ||
599 | snprintf(dir_name, sizeof(dir_name), "%d-%d", task_pid_nr(current), fd); | |
929f45e3 | 600 | kvm->debugfs_dentry = debugfs_create_dir(dir_name, kvm_debugfs_dir); |
536a6f88 JF |
601 | |
602 | kvm->debugfs_stat_data = kcalloc(kvm_debugfs_num_entries, | |
603 | sizeof(*kvm->debugfs_stat_data), | |
b12ce36a | 604 | GFP_KERNEL_ACCOUNT); |
536a6f88 JF |
605 | if (!kvm->debugfs_stat_data) |
606 | return -ENOMEM; | |
607 | ||
608 | for (p = debugfs_entries; p->name; p++) { | |
b12ce36a | 609 | stat_data = kzalloc(sizeof(*stat_data), GFP_KERNEL_ACCOUNT); |
536a6f88 JF |
610 | if (!stat_data) |
611 | return -ENOMEM; | |
612 | ||
613 | stat_data->kvm = kvm; | |
614 | stat_data->offset = p->offset; | |
615 | kvm->debugfs_stat_data[p - debugfs_entries] = stat_data; | |
929f45e3 GKH |
616 | debugfs_create_file(p->name, 0644, kvm->debugfs_dentry, |
617 | stat_data, stat_fops_per_vm[p->kind]); | |
536a6f88 JF |
618 | } |
619 | return 0; | |
620 | } | |
621 | ||
e08b9637 | 622 | static struct kvm *kvm_create_vm(unsigned long type) |
6aa8b732 | 623 | { |
d89f5eff JK |
624 | int r, i; |
625 | struct kvm *kvm = kvm_arch_alloc_vm(); | |
6aa8b732 | 626 | |
d89f5eff JK |
627 | if (!kvm) |
628 | return ERR_PTR(-ENOMEM); | |
629 | ||
e9ad4ec8 | 630 | spin_lock_init(&kvm->mmu_lock); |
f1f10076 | 631 | mmgrab(current->mm); |
e9ad4ec8 PB |
632 | kvm->mm = current->mm; |
633 | kvm_eventfd_init(kvm); | |
634 | mutex_init(&kvm->lock); | |
635 | mutex_init(&kvm->irq_lock); | |
636 | mutex_init(&kvm->slots_lock); | |
e3736c3e | 637 | refcount_set(&kvm->users_count, 1); |
e9ad4ec8 PB |
638 | INIT_LIST_HEAD(&kvm->devices); |
639 | ||
e08b9637 | 640 | r = kvm_arch_init_vm(kvm, type); |
d89f5eff | 641 | if (r) |
719d93cd | 642 | goto out_err_no_disable; |
10474ae8 AG |
643 | |
644 | r = hardware_enable_all(); | |
645 | if (r) | |
719d93cd | 646 | goto out_err_no_disable; |
10474ae8 | 647 | |
c77dcacb | 648 | #ifdef CONFIG_HAVE_KVM_IRQFD |
136bdfee | 649 | INIT_HLIST_HEAD(&kvm->irq_ack_notifier_list); |
75858a84 | 650 | #endif |
6aa8b732 | 651 | |
1e702d9a AW |
652 | BUILD_BUG_ON(KVM_MEM_SLOTS_NUM > SHRT_MAX); |
653 | ||
46a26bf5 | 654 | r = -ENOMEM; |
f481b069 | 655 | for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++) { |
4bd518f1 PB |
656 | struct kvm_memslots *slots = kvm_alloc_memslots(); |
657 | if (!slots) | |
f481b069 | 658 | goto out_err_no_srcu; |
4bd518f1 PB |
659 | /* |
660 | * Generations must be different for each address space. | |
661 | * Init kvm generation close to the maximum to easily test the | |
662 | * code of handling generation number wrap-around. | |
663 | */ | |
664 | slots->generation = i * 2 - 150; | |
665 | rcu_assign_pointer(kvm->memslots[i], slots); | |
f481b069 | 666 | } |
00f034a1 | 667 | |
bc6678a3 | 668 | if (init_srcu_struct(&kvm->srcu)) |
719d93cd CB |
669 | goto out_err_no_srcu; |
670 | if (init_srcu_struct(&kvm->irq_srcu)) | |
671 | goto out_err_no_irq_srcu; | |
e93f8a0f | 672 | for (i = 0; i < KVM_NR_BUSES; i++) { |
4a12f951 | 673 | rcu_assign_pointer(kvm->buses[i], |
b12ce36a | 674 | kzalloc(sizeof(struct kvm_io_bus), GFP_KERNEL_ACCOUNT)); |
57e7fbee | 675 | if (!kvm->buses[i]) |
e93f8a0f | 676 | goto out_err; |
e93f8a0f | 677 | } |
e930bffe | 678 | |
74b5c5bf MW |
679 | r = kvm_init_mmu_notifier(kvm); |
680 | if (r) | |
681 | goto out_err; | |
682 | ||
2f303b74 | 683 | spin_lock(&kvm_lock); |
5e58cfe4 | 684 | list_add(&kvm->vm_list, &vm_list); |
2f303b74 | 685 | spin_unlock(&kvm_lock); |
d89f5eff | 686 | |
2ecd9d29 PZ |
687 | preempt_notifier_inc(); |
688 | ||
f17abe9a | 689 | return kvm; |
10474ae8 AG |
690 | |
691 | out_err: | |
719d93cd CB |
692 | cleanup_srcu_struct(&kvm->irq_srcu); |
693 | out_err_no_irq_srcu: | |
57e7fbee | 694 | cleanup_srcu_struct(&kvm->srcu); |
719d93cd | 695 | out_err_no_srcu: |
10474ae8 | 696 | hardware_disable_all(); |
719d93cd | 697 | out_err_no_disable: |
021086e3 | 698 | refcount_set(&kvm->users_count, 0); |
e93f8a0f | 699 | for (i = 0; i < KVM_NR_BUSES; i++) |
3898da94 | 700 | kfree(kvm_get_bus(kvm, i)); |
f481b069 | 701 | for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++) |
3898da94 | 702 | kvm_free_memslots(kvm, __kvm_memslots(kvm, i)); |
d89f5eff | 703 | kvm_arch_free_vm(kvm); |
e9ad4ec8 | 704 | mmdrop(current->mm); |
10474ae8 | 705 | return ERR_PTR(r); |
f17abe9a AK |
706 | } |
707 | ||
07f0a7bd SW |
708 | static void kvm_destroy_devices(struct kvm *kvm) |
709 | { | |
e6e3b5a6 | 710 | struct kvm_device *dev, *tmp; |
07f0a7bd | 711 | |
a28ebea2 CD |
712 | /* |
713 | * We do not need to take the kvm->lock here, because nobody else | |
714 | * has a reference to the struct kvm at this point and therefore | |
715 | * cannot access the devices list anyhow. | |
716 | */ | |
e6e3b5a6 GT |
717 | list_for_each_entry_safe(dev, tmp, &kvm->devices, vm_node) { |
718 | list_del(&dev->vm_node); | |
07f0a7bd SW |
719 | dev->ops->destroy(dev); |
720 | } | |
721 | } | |
722 | ||
f17abe9a AK |
723 | static void kvm_destroy_vm(struct kvm *kvm) |
724 | { | |
e93f8a0f | 725 | int i; |
6d4e4c4f AK |
726 | struct mm_struct *mm = kvm->mm; |
727 | ||
286de8f6 | 728 | kvm_uevent_notify_change(KVM_EVENT_DESTROY_VM, kvm); |
536a6f88 | 729 | kvm_destroy_vm_debugfs(kvm); |
ad8ba2cd | 730 | kvm_arch_sync_events(kvm); |
2f303b74 | 731 | spin_lock(&kvm_lock); |
133de902 | 732 | list_del(&kvm->vm_list); |
2f303b74 | 733 | spin_unlock(&kvm_lock); |
399ec807 | 734 | kvm_free_irq_routing(kvm); |
df630b8c | 735 | for (i = 0; i < KVM_NR_BUSES; i++) { |
3898da94 | 736 | struct kvm_io_bus *bus = kvm_get_bus(kvm, i); |
4a12f951 | 737 | |
4a12f951 CB |
738 | if (bus) |
739 | kvm_io_bus_destroy(bus); | |
df630b8c PX |
740 | kvm->buses[i] = NULL; |
741 | } | |
980da6ce | 742 | kvm_coalesced_mmio_free(kvm); |
e930bffe AA |
743 | #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER) |
744 | mmu_notifier_unregister(&kvm->mmu_notifier, kvm->mm); | |
f00be0ca | 745 | #else |
2df72e9b | 746 | kvm_arch_flush_shadow_all(kvm); |
5f94c174 | 747 | #endif |
d19a9cd2 | 748 | kvm_arch_destroy_vm(kvm); |
07f0a7bd | 749 | kvm_destroy_devices(kvm); |
f481b069 | 750 | for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++) |
3898da94 | 751 | kvm_free_memslots(kvm, __kvm_memslots(kvm, i)); |
820b3fcd | 752 | cleanup_srcu_struct(&kvm->irq_srcu); |
d89f5eff JK |
753 | cleanup_srcu_struct(&kvm->srcu); |
754 | kvm_arch_free_vm(kvm); | |
2ecd9d29 | 755 | preempt_notifier_dec(); |
10474ae8 | 756 | hardware_disable_all(); |
6d4e4c4f | 757 | mmdrop(mm); |
f17abe9a AK |
758 | } |
759 | ||
d39f13b0 IE |
760 | void kvm_get_kvm(struct kvm *kvm) |
761 | { | |
e3736c3e | 762 | refcount_inc(&kvm->users_count); |
d39f13b0 IE |
763 | } |
764 | EXPORT_SYMBOL_GPL(kvm_get_kvm); | |
765 | ||
766 | void kvm_put_kvm(struct kvm *kvm) | |
767 | { | |
e3736c3e | 768 | if (refcount_dec_and_test(&kvm->users_count)) |
d39f13b0 IE |
769 | kvm_destroy_vm(kvm); |
770 | } | |
771 | EXPORT_SYMBOL_GPL(kvm_put_kvm); | |
772 | ||
773 | ||
f17abe9a AK |
774 | static int kvm_vm_release(struct inode *inode, struct file *filp) |
775 | { | |
776 | struct kvm *kvm = filp->private_data; | |
777 | ||
721eecbf GH |
778 | kvm_irqfd_release(kvm); |
779 | ||
d39f13b0 | 780 | kvm_put_kvm(kvm); |
6aa8b732 AK |
781 | return 0; |
782 | } | |
783 | ||
515a0127 TY |
784 | /* |
785 | * Allocation size is twice as large as the actual dirty bitmap size. | |
93474b25 | 786 | * See x86's kvm_vm_ioctl_get_dirty_log() why this is needed. |
515a0127 | 787 | */ |
a36a57b1 TY |
788 | static int kvm_create_dirty_bitmap(struct kvm_memory_slot *memslot) |
789 | { | |
515a0127 | 790 | unsigned long dirty_bytes = 2 * kvm_dirty_bitmap_bytes(memslot); |
a36a57b1 | 791 | |
b12ce36a | 792 | memslot->dirty_bitmap = kvzalloc(dirty_bytes, GFP_KERNEL_ACCOUNT); |
a36a57b1 TY |
793 | if (!memslot->dirty_bitmap) |
794 | return -ENOMEM; | |
795 | ||
a36a57b1 TY |
796 | return 0; |
797 | } | |
798 | ||
bf3e05bc | 799 | /* |
0e60b079 IM |
800 | * Insert memslot and re-sort memslots based on their GFN, |
801 | * so binary search could be used to lookup GFN. | |
802 | * Sorting algorithm takes advantage of having initially | |
803 | * sorted array and known changed memslot position. | |
bf3e05bc | 804 | */ |
5cc15027 | 805 | static void update_memslots(struct kvm_memslots *slots, |
31fc4f95 WY |
806 | struct kvm_memory_slot *new, |
807 | enum kvm_mr_change change) | |
bf3e05bc | 808 | { |
8593176c PB |
809 | int id = new->id; |
810 | int i = slots->id_to_index[id]; | |
063584d4 | 811 | struct kvm_memory_slot *mslots = slots->memslots; |
f85e2cb5 | 812 | |
8593176c | 813 | WARN_ON(mslots[i].id != id); |
31fc4f95 WY |
814 | switch (change) { |
815 | case KVM_MR_CREATE: | |
816 | slots->used_slots++; | |
817 | WARN_ON(mslots[i].npages || !new->npages); | |
818 | break; | |
819 | case KVM_MR_DELETE: | |
820 | slots->used_slots--; | |
821 | WARN_ON(new->npages || !mslots[i].npages); | |
822 | break; | |
823 | default: | |
824 | break; | |
9c1a5d38 | 825 | } |
0e60b079 | 826 | |
7f379cff | 827 | while (i < KVM_MEM_SLOTS_NUM - 1 && |
0e60b079 IM |
828 | new->base_gfn <= mslots[i + 1].base_gfn) { |
829 | if (!mslots[i + 1].npages) | |
830 | break; | |
7f379cff IM |
831 | mslots[i] = mslots[i + 1]; |
832 | slots->id_to_index[mslots[i].id] = i; | |
833 | i++; | |
834 | } | |
efbeec70 PB |
835 | |
836 | /* | |
837 | * The ">=" is needed when creating a slot with base_gfn == 0, | |
838 | * so that it moves before all those with base_gfn == npages == 0. | |
839 | * | |
840 | * On the other hand, if new->npages is zero, the above loop has | |
841 | * already left i pointing to the beginning of the empty part of | |
842 | * mslots, and the ">=" would move the hole backwards in this | |
843 | * case---which is wrong. So skip the loop when deleting a slot. | |
844 | */ | |
845 | if (new->npages) { | |
846 | while (i > 0 && | |
847 | new->base_gfn >= mslots[i - 1].base_gfn) { | |
848 | mslots[i] = mslots[i - 1]; | |
849 | slots->id_to_index[mslots[i].id] = i; | |
850 | i--; | |
851 | } | |
dbaff309 PB |
852 | } else |
853 | WARN_ON_ONCE(i != slots->used_slots); | |
f85e2cb5 | 854 | |
8593176c PB |
855 | mslots[i] = *new; |
856 | slots->id_to_index[mslots[i].id] = i; | |
bf3e05bc XG |
857 | } |
858 | ||
09170a49 | 859 | static int check_memory_region_flags(const struct kvm_userspace_memory_region *mem) |
a50d64d6 | 860 | { |
4d8b81ab XG |
861 | u32 valid_flags = KVM_MEM_LOG_DIRTY_PAGES; |
862 | ||
0f8a4de3 | 863 | #ifdef __KVM_HAVE_READONLY_MEM |
4d8b81ab XG |
864 | valid_flags |= KVM_MEM_READONLY; |
865 | #endif | |
866 | ||
867 | if (mem->flags & ~valid_flags) | |
a50d64d6 XG |
868 | return -EINVAL; |
869 | ||
870 | return 0; | |
871 | } | |
872 | ||
7ec4fb44 | 873 | static struct kvm_memslots *install_new_memslots(struct kvm *kvm, |
f481b069 | 874 | int as_id, struct kvm_memslots *slots) |
7ec4fb44 | 875 | { |
f481b069 | 876 | struct kvm_memslots *old_memslots = __kvm_memslots(kvm, as_id); |
361209e0 | 877 | u64 gen = old_memslots->generation; |
7ec4fb44 | 878 | |
361209e0 SC |
879 | WARN_ON(gen & KVM_MEMSLOT_GEN_UPDATE_IN_PROGRESS); |
880 | slots->generation = gen | KVM_MEMSLOT_GEN_UPDATE_IN_PROGRESS; | |
ee3d1570 | 881 | |
f481b069 | 882 | rcu_assign_pointer(kvm->memslots[as_id], slots); |
7ec4fb44 | 883 | synchronize_srcu_expedited(&kvm->srcu); |
e59dbe09 | 884 | |
ee3d1570 | 885 | /* |
361209e0 SC |
886 | * Increment the new memslot generation a second time, dropping the |
887 | * update in-progress flag and incrementing then generation based on | |
888 | * the number of address spaces. This provides a unique and easily | |
889 | * identifiable generation number while the memslots are in flux. | |
890 | */ | |
891 | gen = slots->generation & ~KVM_MEMSLOT_GEN_UPDATE_IN_PROGRESS; | |
892 | ||
893 | /* | |
4bd518f1 PB |
894 | * Generations must be unique even across address spaces. We do not need |
895 | * a global counter for that, instead the generation space is evenly split | |
896 | * across address spaces. For example, with two address spaces, address | |
361209e0 | 897 | * space 0 will use generations 0, 4, 8, ... while address space 1 will |
4bd518f1 | 898 | * use generations 2, 6, 10, 14, ... |
ee3d1570 | 899 | */ |
361209e0 | 900 | gen += KVM_ADDRESS_SPACE_NUM * 2; |
ee3d1570 | 901 | |
15248258 SC |
902 | kvm_arch_memslots_updated(kvm, gen); |
903 | ||
904 | slots->generation = gen; | |
e59dbe09 TY |
905 | |
906 | return old_memslots; | |
7ec4fb44 GN |
907 | } |
908 | ||
6aa8b732 AK |
909 | /* |
910 | * Allocate some memory and give it an address in the guest physical address | |
911 | * space. | |
912 | * | |
913 | * Discontiguous memory is allowed, mostly for framebuffers. | |
f78e0e2e | 914 | * |
02d5d55b | 915 | * Must be called holding kvm->slots_lock for write. |
6aa8b732 | 916 | */ |
f78e0e2e | 917 | int __kvm_set_memory_region(struct kvm *kvm, |
09170a49 | 918 | const struct kvm_userspace_memory_region *mem) |
6aa8b732 | 919 | { |
8234b22e | 920 | int r; |
6aa8b732 | 921 | gfn_t base_gfn; |
28bcb112 | 922 | unsigned long npages; |
a843fac2 | 923 | struct kvm_memory_slot *slot; |
6aa8b732 | 924 | struct kvm_memory_slot old, new; |
b7f69c55 | 925 | struct kvm_memslots *slots = NULL, *old_memslots; |
f481b069 | 926 | int as_id, id; |
f64c0398 | 927 | enum kvm_mr_change change; |
6aa8b732 | 928 | |
a50d64d6 XG |
929 | r = check_memory_region_flags(mem); |
930 | if (r) | |
931 | goto out; | |
932 | ||
6aa8b732 | 933 | r = -EINVAL; |
f481b069 PB |
934 | as_id = mem->slot >> 16; |
935 | id = (u16)mem->slot; | |
936 | ||
6aa8b732 AK |
937 | /* General sanity checks */ |
938 | if (mem->memory_size & (PAGE_SIZE - 1)) | |
939 | goto out; | |
940 | if (mem->guest_phys_addr & (PAGE_SIZE - 1)) | |
941 | goto out; | |
fa3d315a | 942 | /* We can read the guest memory with __xxx_user() later on. */ |
f481b069 | 943 | if ((id < KVM_USER_MEM_SLOTS) && |
fa3d315a | 944 | ((mem->userspace_addr & (PAGE_SIZE - 1)) || |
96d4f267 | 945 | !access_ok((void __user *)(unsigned long)mem->userspace_addr, |
9e3bb6b6 | 946 | mem->memory_size))) |
78749809 | 947 | goto out; |
f481b069 | 948 | if (as_id >= KVM_ADDRESS_SPACE_NUM || id >= KVM_MEM_SLOTS_NUM) |
6aa8b732 AK |
949 | goto out; |
950 | if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr) | |
951 | goto out; | |
952 | ||
f481b069 | 953 | slot = id_to_memslot(__kvm_memslots(kvm, as_id), id); |
6aa8b732 AK |
954 | base_gfn = mem->guest_phys_addr >> PAGE_SHIFT; |
955 | npages = mem->memory_size >> PAGE_SHIFT; | |
956 | ||
660c22c4 TY |
957 | if (npages > KVM_MEM_MAX_NR_PAGES) |
958 | goto out; | |
959 | ||
a843fac2 | 960 | new = old = *slot; |
6aa8b732 | 961 | |
f481b069 | 962 | new.id = id; |
6aa8b732 AK |
963 | new.base_gfn = base_gfn; |
964 | new.npages = npages; | |
965 | new.flags = mem->flags; | |
966 | ||
f64c0398 TY |
967 | if (npages) { |
968 | if (!old.npages) | |
969 | change = KVM_MR_CREATE; | |
970 | else { /* Modify an existing slot. */ | |
971 | if ((mem->userspace_addr != old.userspace_addr) || | |
75d61fbc TY |
972 | (npages != old.npages) || |
973 | ((new.flags ^ old.flags) & KVM_MEM_READONLY)) | |
f64c0398 TY |
974 | goto out; |
975 | ||
976 | if (base_gfn != old.base_gfn) | |
977 | change = KVM_MR_MOVE; | |
978 | else if (new.flags != old.flags) | |
979 | change = KVM_MR_FLAGS_ONLY; | |
980 | else { /* Nothing to change. */ | |
981 | r = 0; | |
982 | goto out; | |
983 | } | |
984 | } | |
09170a49 PB |
985 | } else { |
986 | if (!old.npages) | |
987 | goto out; | |
988 | ||
f64c0398 | 989 | change = KVM_MR_DELETE; |
09170a49 PB |
990 | new.base_gfn = 0; |
991 | new.flags = 0; | |
992 | } | |
6aa8b732 | 993 | |
f64c0398 | 994 | if ((change == KVM_MR_CREATE) || (change == KVM_MR_MOVE)) { |
0a706bee TY |
995 | /* Check for overlaps */ |
996 | r = -EEXIST; | |
f481b069 | 997 | kvm_for_each_memslot(slot, __kvm_memslots(kvm, as_id)) { |
b28676bb | 998 | if (slot->id == id) |
0a706bee TY |
999 | continue; |
1000 | if (!((base_gfn + npages <= slot->base_gfn) || | |
1001 | (base_gfn >= slot->base_gfn + slot->npages))) | |
1002 | goto out; | |
1003 | } | |
6aa8b732 | 1004 | } |
6aa8b732 | 1005 | |
6aa8b732 AK |
1006 | /* Free page dirty bitmap if unneeded */ |
1007 | if (!(new.flags & KVM_MEM_LOG_DIRTY_PAGES)) | |
8b6d44c7 | 1008 | new.dirty_bitmap = NULL; |
6aa8b732 AK |
1009 | |
1010 | r = -ENOMEM; | |
f64c0398 | 1011 | if (change == KVM_MR_CREATE) { |
189a2f7b | 1012 | new.userspace_addr = mem->userspace_addr; |
d89cc617 | 1013 | |
5587027c | 1014 | if (kvm_arch_create_memslot(kvm, &new, npages)) |
db3fe4eb | 1015 | goto out_free; |
6aa8b732 | 1016 | } |
ec04b260 | 1017 | |
6aa8b732 AK |
1018 | /* Allocate page dirty bitmap if needed */ |
1019 | if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) { | |
a36a57b1 | 1020 | if (kvm_create_dirty_bitmap(&new) < 0) |
f78e0e2e | 1021 | goto out_free; |
6aa8b732 AK |
1022 | } |
1023 | ||
b12ce36a | 1024 | slots = kvzalloc(sizeof(struct kvm_memslots), GFP_KERNEL_ACCOUNT); |
f2a81036 PB |
1025 | if (!slots) |
1026 | goto out_free; | |
f481b069 | 1027 | memcpy(slots, __kvm_memslots(kvm, as_id), sizeof(struct kvm_memslots)); |
f2a81036 | 1028 | |
f64c0398 | 1029 | if ((change == KVM_MR_DELETE) || (change == KVM_MR_MOVE)) { |
f481b069 | 1030 | slot = id_to_memslot(slots, id); |
28a37544 XG |
1031 | slot->flags |= KVM_MEMSLOT_INVALID; |
1032 | ||
f481b069 | 1033 | old_memslots = install_new_memslots(kvm, as_id, slots); |
bc6678a3 | 1034 | |
12d6e753 MT |
1035 | /* From this point no new shadow pages pointing to a deleted, |
1036 | * or moved, memslot will be created. | |
bc6678a3 MT |
1037 | * |
1038 | * validation of sp->gfn happens in: | |
b7d409de XL |
1039 | * - gfn_to_hva (kvm_read_guest, gfn_to_pfn) |
1040 | * - kvm_is_visible_gfn (mmu_check_roots) | |
bc6678a3 | 1041 | */ |
2df72e9b | 1042 | kvm_arch_flush_shadow_memslot(kvm, slot); |
f2a81036 PB |
1043 | |
1044 | /* | |
1045 | * We can re-use the old_memslots from above, the only difference | |
1046 | * from the currently installed memslots is the invalid flag. This | |
1047 | * will get overwritten by update_memslots anyway. | |
1048 | */ | |
b7f69c55 | 1049 | slots = old_memslots; |
bc6678a3 | 1050 | } |
34d4cb8f | 1051 | |
7b6195a9 | 1052 | r = kvm_arch_prepare_memory_region(kvm, &new, mem, change); |
f7784b8e | 1053 | if (r) |
b7f69c55 | 1054 | goto out_slots; |
f7784b8e | 1055 | |
a47d2b07 | 1056 | /* actual memory is freed via old in kvm_free_memslot below */ |
f64c0398 | 1057 | if (change == KVM_MR_DELETE) { |
bc6678a3 | 1058 | new.dirty_bitmap = NULL; |
db3fe4eb | 1059 | memset(&new.arch, 0, sizeof(new.arch)); |
bc6678a3 MT |
1060 | } |
1061 | ||
31fc4f95 | 1062 | update_memslots(slots, &new, change); |
f481b069 | 1063 | old_memslots = install_new_memslots(kvm, as_id, slots); |
3ad82a7e | 1064 | |
f36f3f28 | 1065 | kvm_arch_commit_memory_region(kvm, mem, &old, &new, change); |
82ce2c96 | 1066 | |
a47d2b07 | 1067 | kvm_free_memslot(kvm, &old, &new); |
74496134 | 1068 | kvfree(old_memslots); |
6aa8b732 AK |
1069 | return 0; |
1070 | ||
e40f193f | 1071 | out_slots: |
74496134 | 1072 | kvfree(slots); |
f78e0e2e | 1073 | out_free: |
a47d2b07 | 1074 | kvm_free_memslot(kvm, &new, &old); |
6aa8b732 AK |
1075 | out: |
1076 | return r; | |
210c7c4d | 1077 | } |
f78e0e2e SY |
1078 | EXPORT_SYMBOL_GPL(__kvm_set_memory_region); |
1079 | ||
1080 | int kvm_set_memory_region(struct kvm *kvm, | |
09170a49 | 1081 | const struct kvm_userspace_memory_region *mem) |
f78e0e2e SY |
1082 | { |
1083 | int r; | |
1084 | ||
79fac95e | 1085 | mutex_lock(&kvm->slots_lock); |
47ae31e2 | 1086 | r = __kvm_set_memory_region(kvm, mem); |
79fac95e | 1087 | mutex_unlock(&kvm->slots_lock); |
f78e0e2e SY |
1088 | return r; |
1089 | } | |
210c7c4d IE |
1090 | EXPORT_SYMBOL_GPL(kvm_set_memory_region); |
1091 | ||
7940876e SH |
1092 | static int kvm_vm_ioctl_set_memory_region(struct kvm *kvm, |
1093 | struct kvm_userspace_memory_region *mem) | |
210c7c4d | 1094 | { |
f481b069 | 1095 | if ((u16)mem->slot >= KVM_USER_MEM_SLOTS) |
e0d62c7f | 1096 | return -EINVAL; |
09170a49 | 1097 | |
47ae31e2 | 1098 | return kvm_set_memory_region(kvm, mem); |
6aa8b732 AK |
1099 | } |
1100 | ||
5bb064dc ZX |
1101 | int kvm_get_dirty_log(struct kvm *kvm, |
1102 | struct kvm_dirty_log *log, int *is_dirty) | |
6aa8b732 | 1103 | { |
9f6b8029 | 1104 | struct kvm_memslots *slots; |
6aa8b732 | 1105 | struct kvm_memory_slot *memslot; |
843574a3 | 1106 | int i, as_id, id; |
87bf6e7d | 1107 | unsigned long n; |
6aa8b732 AK |
1108 | unsigned long any = 0; |
1109 | ||
f481b069 PB |
1110 | as_id = log->slot >> 16; |
1111 | id = (u16)log->slot; | |
1112 | if (as_id >= KVM_ADDRESS_SPACE_NUM || id >= KVM_USER_MEM_SLOTS) | |
843574a3 | 1113 | return -EINVAL; |
6aa8b732 | 1114 | |
f481b069 PB |
1115 | slots = __kvm_memslots(kvm, as_id); |
1116 | memslot = id_to_memslot(slots, id); | |
6aa8b732 | 1117 | if (!memslot->dirty_bitmap) |
843574a3 | 1118 | return -ENOENT; |
6aa8b732 | 1119 | |
87bf6e7d | 1120 | n = kvm_dirty_bitmap_bytes(memslot); |
6aa8b732 | 1121 | |
cd1a4a98 | 1122 | for (i = 0; !any && i < n/sizeof(long); ++i) |
6aa8b732 AK |
1123 | any = memslot->dirty_bitmap[i]; |
1124 | ||
6aa8b732 | 1125 | if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n)) |
843574a3 | 1126 | return -EFAULT; |
6aa8b732 | 1127 | |
5bb064dc ZX |
1128 | if (any) |
1129 | *is_dirty = 1; | |
843574a3 | 1130 | return 0; |
6aa8b732 | 1131 | } |
2ba9f0d8 | 1132 | EXPORT_SYMBOL_GPL(kvm_get_dirty_log); |
6aa8b732 | 1133 | |
ba0513b5 MS |
1134 | #ifdef CONFIG_KVM_GENERIC_DIRTYLOG_READ_PROTECT |
1135 | /** | |
1136 | * kvm_get_dirty_log_protect - get a snapshot of dirty pages, and if any pages | |
2a31b9db | 1137 | * and reenable dirty page tracking for the corresponding pages. |
ba0513b5 MS |
1138 | * @kvm: pointer to kvm instance |
1139 | * @log: slot id and address to which we copy the log | |
1140 | * @is_dirty: flag set if any page is dirty | |
1141 | * | |
1142 | * We need to keep it in mind that VCPU threads can write to the bitmap | |
1143 | * concurrently. So, to avoid losing track of dirty pages we keep the | |
1144 | * following order: | |
1145 | * | |
1146 | * 1. Take a snapshot of the bit and clear it if needed. | |
1147 | * 2. Write protect the corresponding page. | |
1148 | * 3. Copy the snapshot to the userspace. | |
1149 | * 4. Upon return caller flushes TLB's if needed. | |
1150 | * | |
1151 | * Between 2 and 4, the guest may write to the page using the remaining TLB | |
1152 | * entry. This is not a problem because the page is reported dirty using | |
1153 | * the snapshot taken before and step 4 ensures that writes done after | |
1154 | * exiting to userspace will be logged for the next call. | |
1155 | * | |
1156 | */ | |
1157 | int kvm_get_dirty_log_protect(struct kvm *kvm, | |
8fe65a82 | 1158 | struct kvm_dirty_log *log, bool *flush) |
ba0513b5 | 1159 | { |
9f6b8029 | 1160 | struct kvm_memslots *slots; |
ba0513b5 | 1161 | struct kvm_memory_slot *memslot; |
58d6db34 | 1162 | int i, as_id, id; |
ba0513b5 MS |
1163 | unsigned long n; |
1164 | unsigned long *dirty_bitmap; | |
1165 | unsigned long *dirty_bitmap_buffer; | |
1166 | ||
f481b069 PB |
1167 | as_id = log->slot >> 16; |
1168 | id = (u16)log->slot; | |
1169 | if (as_id >= KVM_ADDRESS_SPACE_NUM || id >= KVM_USER_MEM_SLOTS) | |
58d6db34 | 1170 | return -EINVAL; |
ba0513b5 | 1171 | |
f481b069 PB |
1172 | slots = __kvm_memslots(kvm, as_id); |
1173 | memslot = id_to_memslot(slots, id); | |
ba0513b5 MS |
1174 | |
1175 | dirty_bitmap = memslot->dirty_bitmap; | |
ba0513b5 | 1176 | if (!dirty_bitmap) |
58d6db34 | 1177 | return -ENOENT; |
ba0513b5 MS |
1178 | |
1179 | n = kvm_dirty_bitmap_bytes(memslot); | |
2a31b9db PB |
1180 | *flush = false; |
1181 | if (kvm->manual_dirty_log_protect) { | |
1182 | /* | |
1183 | * Unlike kvm_get_dirty_log, we always return false in *flush, | |
1184 | * because no flush is needed until KVM_CLEAR_DIRTY_LOG. There | |
1185 | * is some code duplication between this function and | |
1186 | * kvm_get_dirty_log, but hopefully all architecture | |
1187 | * transition to kvm_get_dirty_log_protect and kvm_get_dirty_log | |
1188 | * can be eliminated. | |
1189 | */ | |
1190 | dirty_bitmap_buffer = dirty_bitmap; | |
1191 | } else { | |
1192 | dirty_bitmap_buffer = kvm_second_dirty_bitmap(memslot); | |
1193 | memset(dirty_bitmap_buffer, 0, n); | |
ba0513b5 | 1194 | |
2a31b9db PB |
1195 | spin_lock(&kvm->mmu_lock); |
1196 | for (i = 0; i < n / sizeof(long); i++) { | |
1197 | unsigned long mask; | |
1198 | gfn_t offset; | |
ba0513b5 | 1199 | |
2a31b9db PB |
1200 | if (!dirty_bitmap[i]) |
1201 | continue; | |
1202 | ||
1203 | *flush = true; | |
1204 | mask = xchg(&dirty_bitmap[i], 0); | |
1205 | dirty_bitmap_buffer[i] = mask; | |
1206 | ||
1207 | if (mask) { | |
1208 | offset = i * BITS_PER_LONG; | |
1209 | kvm_arch_mmu_enable_log_dirty_pt_masked(kvm, memslot, | |
1210 | offset, mask); | |
1211 | } | |
1212 | } | |
1213 | spin_unlock(&kvm->mmu_lock); | |
1214 | } | |
1215 | ||
1216 | if (copy_to_user(log->dirty_bitmap, dirty_bitmap_buffer, n)) | |
1217 | return -EFAULT; | |
1218 | return 0; | |
1219 | } | |
1220 | EXPORT_SYMBOL_GPL(kvm_get_dirty_log_protect); | |
1221 | ||
1222 | /** | |
1223 | * kvm_clear_dirty_log_protect - clear dirty bits in the bitmap | |
1224 | * and reenable dirty page tracking for the corresponding pages. | |
1225 | * @kvm: pointer to kvm instance | |
1226 | * @log: slot id and address from which to fetch the bitmap of dirty pages | |
1227 | */ | |
1228 | int kvm_clear_dirty_log_protect(struct kvm *kvm, | |
1229 | struct kvm_clear_dirty_log *log, bool *flush) | |
1230 | { | |
1231 | struct kvm_memslots *slots; | |
1232 | struct kvm_memory_slot *memslot; | |
98938aa8 | 1233 | int as_id, id; |
2a31b9db | 1234 | gfn_t offset; |
98938aa8 | 1235 | unsigned long i, n; |
2a31b9db PB |
1236 | unsigned long *dirty_bitmap; |
1237 | unsigned long *dirty_bitmap_buffer; | |
1238 | ||
1239 | as_id = log->slot >> 16; | |
1240 | id = (u16)log->slot; | |
1241 | if (as_id >= KVM_ADDRESS_SPACE_NUM || id >= KVM_USER_MEM_SLOTS) | |
1242 | return -EINVAL; | |
1243 | ||
1244 | if ((log->first_page & 63) || (log->num_pages & 63)) | |
1245 | return -EINVAL; | |
1246 | ||
1247 | slots = __kvm_memslots(kvm, as_id); | |
1248 | memslot = id_to_memslot(slots, id); | |
1249 | ||
1250 | dirty_bitmap = memslot->dirty_bitmap; | |
1251 | if (!dirty_bitmap) | |
1252 | return -ENOENT; | |
1253 | ||
1254 | n = kvm_dirty_bitmap_bytes(memslot); | |
98938aa8 TB |
1255 | |
1256 | if (log->first_page > memslot->npages || | |
1257 | log->num_pages > memslot->npages - log->first_page) | |
1258 | return -EINVAL; | |
1259 | ||
8fe65a82 | 1260 | *flush = false; |
2a31b9db PB |
1261 | dirty_bitmap_buffer = kvm_second_dirty_bitmap(memslot); |
1262 | if (copy_from_user(dirty_bitmap_buffer, log->dirty_bitmap, n)) | |
1263 | return -EFAULT; | |
ba0513b5 | 1264 | |
2a31b9db PB |
1265 | spin_lock(&kvm->mmu_lock); |
1266 | for (offset = log->first_page, | |
1267 | i = offset / BITS_PER_LONG, n = log->num_pages / BITS_PER_LONG; n--; | |
1268 | i++, offset += BITS_PER_LONG) { | |
1269 | unsigned long mask = *dirty_bitmap_buffer++; | |
1270 | atomic_long_t *p = (atomic_long_t *) &dirty_bitmap[i]; | |
1271 | if (!mask) | |
ba0513b5 MS |
1272 | continue; |
1273 | ||
2a31b9db | 1274 | mask &= atomic_long_fetch_andnot(mask, p); |
ba0513b5 | 1275 | |
2a31b9db PB |
1276 | /* |
1277 | * mask contains the bits that really have been cleared. This | |
1278 | * never includes any bits beyond the length of the memslot (if | |
1279 | * the length is not aligned to 64 pages), therefore it is not | |
1280 | * a problem if userspace sets them in log->dirty_bitmap. | |
1281 | */ | |
58d2930f | 1282 | if (mask) { |
2a31b9db | 1283 | *flush = true; |
58d2930f TY |
1284 | kvm_arch_mmu_enable_log_dirty_pt_masked(kvm, memslot, |
1285 | offset, mask); | |
1286 | } | |
ba0513b5 | 1287 | } |
ba0513b5 | 1288 | spin_unlock(&kvm->mmu_lock); |
2a31b9db | 1289 | |
58d6db34 | 1290 | return 0; |
ba0513b5 | 1291 | } |
2a31b9db | 1292 | EXPORT_SYMBOL_GPL(kvm_clear_dirty_log_protect); |
ba0513b5 MS |
1293 | #endif |
1294 | ||
db3fe4eb TY |
1295 | bool kvm_largepages_enabled(void) |
1296 | { | |
1297 | return largepages_enabled; | |
1298 | } | |
1299 | ||
54dee993 MT |
1300 | void kvm_disable_largepages(void) |
1301 | { | |
1302 | largepages_enabled = false; | |
1303 | } | |
1304 | EXPORT_SYMBOL_GPL(kvm_disable_largepages); | |
1305 | ||
49c7754c GN |
1306 | struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn) |
1307 | { | |
1308 | return __gfn_to_memslot(kvm_memslots(kvm), gfn); | |
1309 | } | |
a1f4d395 | 1310 | EXPORT_SYMBOL_GPL(gfn_to_memslot); |
6aa8b732 | 1311 | |
8e73485c PB |
1312 | struct kvm_memory_slot *kvm_vcpu_gfn_to_memslot(struct kvm_vcpu *vcpu, gfn_t gfn) |
1313 | { | |
1314 | return __gfn_to_memslot(kvm_vcpu_memslots(vcpu), gfn); | |
1315 | } | |
1316 | ||
33e94154 | 1317 | bool kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn) |
e0d62c7f | 1318 | { |
bf3e05bc | 1319 | struct kvm_memory_slot *memslot = gfn_to_memslot(kvm, gfn); |
e0d62c7f | 1320 | |
bbacc0c1 | 1321 | if (!memslot || memslot->id >= KVM_USER_MEM_SLOTS || |
bf3e05bc | 1322 | memslot->flags & KVM_MEMSLOT_INVALID) |
33e94154 | 1323 | return false; |
e0d62c7f | 1324 | |
33e94154 | 1325 | return true; |
e0d62c7f IE |
1326 | } |
1327 | EXPORT_SYMBOL_GPL(kvm_is_visible_gfn); | |
1328 | ||
8f0b1ab6 JR |
1329 | unsigned long kvm_host_page_size(struct kvm *kvm, gfn_t gfn) |
1330 | { | |
1331 | struct vm_area_struct *vma; | |
1332 | unsigned long addr, size; | |
1333 | ||
1334 | size = PAGE_SIZE; | |
1335 | ||
1336 | addr = gfn_to_hva(kvm, gfn); | |
1337 | if (kvm_is_error_hva(addr)) | |
1338 | return PAGE_SIZE; | |
1339 | ||
1340 | down_read(¤t->mm->mmap_sem); | |
1341 | vma = find_vma(current->mm, addr); | |
1342 | if (!vma) | |
1343 | goto out; | |
1344 | ||
1345 | size = vma_kernel_pagesize(vma); | |
1346 | ||
1347 | out: | |
1348 | up_read(¤t->mm->mmap_sem); | |
1349 | ||
1350 | return size; | |
1351 | } | |
1352 | ||
4d8b81ab XG |
1353 | static bool memslot_is_readonly(struct kvm_memory_slot *slot) |
1354 | { | |
1355 | return slot->flags & KVM_MEM_READONLY; | |
1356 | } | |
1357 | ||
4d8b81ab XG |
1358 | static unsigned long __gfn_to_hva_many(struct kvm_memory_slot *slot, gfn_t gfn, |
1359 | gfn_t *nr_pages, bool write) | |
539cb660 | 1360 | { |
bc6678a3 | 1361 | if (!slot || slot->flags & KVM_MEMSLOT_INVALID) |
ca3a490c | 1362 | return KVM_HVA_ERR_BAD; |
48987781 | 1363 | |
4d8b81ab XG |
1364 | if (memslot_is_readonly(slot) && write) |
1365 | return KVM_HVA_ERR_RO_BAD; | |
48987781 XG |
1366 | |
1367 | if (nr_pages) | |
1368 | *nr_pages = slot->npages - (gfn - slot->base_gfn); | |
1369 | ||
4d8b81ab | 1370 | return __gfn_to_hva_memslot(slot, gfn); |
539cb660 | 1371 | } |
48987781 | 1372 | |
4d8b81ab XG |
1373 | static unsigned long gfn_to_hva_many(struct kvm_memory_slot *slot, gfn_t gfn, |
1374 | gfn_t *nr_pages) | |
1375 | { | |
1376 | return __gfn_to_hva_many(slot, gfn, nr_pages, true); | |
539cb660 | 1377 | } |
48987781 | 1378 | |
4d8b81ab | 1379 | unsigned long gfn_to_hva_memslot(struct kvm_memory_slot *slot, |
7940876e | 1380 | gfn_t gfn) |
4d8b81ab XG |
1381 | { |
1382 | return gfn_to_hva_many(slot, gfn, NULL); | |
1383 | } | |
1384 | EXPORT_SYMBOL_GPL(gfn_to_hva_memslot); | |
1385 | ||
48987781 XG |
1386 | unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn) |
1387 | { | |
49c7754c | 1388 | return gfn_to_hva_many(gfn_to_memslot(kvm, gfn), gfn, NULL); |
48987781 | 1389 | } |
0d150298 | 1390 | EXPORT_SYMBOL_GPL(gfn_to_hva); |
539cb660 | 1391 | |
8e73485c PB |
1392 | unsigned long kvm_vcpu_gfn_to_hva(struct kvm_vcpu *vcpu, gfn_t gfn) |
1393 | { | |
1394 | return gfn_to_hva_many(kvm_vcpu_gfn_to_memslot(vcpu, gfn), gfn, NULL); | |
1395 | } | |
1396 | EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_hva); | |
1397 | ||
86ab8cff | 1398 | /* |
970c0d4b WY |
1399 | * Return the hva of a @gfn and the R/W attribute if possible. |
1400 | * | |
1401 | * @slot: the kvm_memory_slot which contains @gfn | |
1402 | * @gfn: the gfn to be translated | |
1403 | * @writable: used to return the read/write attribute of the @slot if the hva | |
1404 | * is valid and @writable is not NULL | |
86ab8cff | 1405 | */ |
64d83126 CD |
1406 | unsigned long gfn_to_hva_memslot_prot(struct kvm_memory_slot *slot, |
1407 | gfn_t gfn, bool *writable) | |
86ab8cff | 1408 | { |
a2ac07fe GN |
1409 | unsigned long hva = __gfn_to_hva_many(slot, gfn, NULL, false); |
1410 | ||
1411 | if (!kvm_is_error_hva(hva) && writable) | |
ba6a3541 PB |
1412 | *writable = !memslot_is_readonly(slot); |
1413 | ||
a2ac07fe | 1414 | return hva; |
86ab8cff XG |
1415 | } |
1416 | ||
64d83126 CD |
1417 | unsigned long gfn_to_hva_prot(struct kvm *kvm, gfn_t gfn, bool *writable) |
1418 | { | |
1419 | struct kvm_memory_slot *slot = gfn_to_memslot(kvm, gfn); | |
1420 | ||
1421 | return gfn_to_hva_memslot_prot(slot, gfn, writable); | |
1422 | } | |
1423 | ||
8e73485c PB |
1424 | unsigned long kvm_vcpu_gfn_to_hva_prot(struct kvm_vcpu *vcpu, gfn_t gfn, bool *writable) |
1425 | { | |
1426 | struct kvm_memory_slot *slot = kvm_vcpu_gfn_to_memslot(vcpu, gfn); | |
1427 | ||
1428 | return gfn_to_hva_memslot_prot(slot, gfn, writable); | |
1429 | } | |
1430 | ||
fafc3dba HY |
1431 | static inline int check_user_page_hwpoison(unsigned long addr) |
1432 | { | |
0d731759 | 1433 | int rc, flags = FOLL_HWPOISON | FOLL_WRITE; |
fafc3dba | 1434 | |
0d731759 | 1435 | rc = get_user_pages(addr, 1, flags, NULL, NULL); |
fafc3dba HY |
1436 | return rc == -EHWPOISON; |
1437 | } | |
1438 | ||
2fc84311 | 1439 | /* |
b9b33da2 PB |
1440 | * The fast path to get the writable pfn which will be stored in @pfn, |
1441 | * true indicates success, otherwise false is returned. It's also the | |
1442 | * only part that runs if we can are in atomic context. | |
2fc84311 | 1443 | */ |
b9b33da2 PB |
1444 | static bool hva_to_pfn_fast(unsigned long addr, bool write_fault, |
1445 | bool *writable, kvm_pfn_t *pfn) | |
954bbbc2 | 1446 | { |
8d4e1288 | 1447 | struct page *page[1]; |
2fc84311 | 1448 | int npages; |
954bbbc2 | 1449 | |
12ce13fe XG |
1450 | /* |
1451 | * Fast pin a writable pfn only if it is a write fault request | |
1452 | * or the caller allows to map a writable pfn for a read fault | |
1453 | * request. | |
1454 | */ | |
1455 | if (!(write_fault || writable)) | |
1456 | return false; | |
612819c3 | 1457 | |
2fc84311 XG |
1458 | npages = __get_user_pages_fast(addr, 1, 1, page); |
1459 | if (npages == 1) { | |
1460 | *pfn = page_to_pfn(page[0]); | |
612819c3 | 1461 | |
2fc84311 XG |
1462 | if (writable) |
1463 | *writable = true; | |
1464 | return true; | |
1465 | } | |
af585b92 | 1466 | |
2fc84311 XG |
1467 | return false; |
1468 | } | |
612819c3 | 1469 | |
2fc84311 XG |
1470 | /* |
1471 | * The slow path to get the pfn of the specified host virtual address, | |
1472 | * 1 indicates success, -errno is returned if error is detected. | |
1473 | */ | |
1474 | static int hva_to_pfn_slow(unsigned long addr, bool *async, bool write_fault, | |
ba049e93 | 1475 | bool *writable, kvm_pfn_t *pfn) |
2fc84311 | 1476 | { |
ce53053c AV |
1477 | unsigned int flags = FOLL_HWPOISON; |
1478 | struct page *page; | |
2fc84311 | 1479 | int npages = 0; |
612819c3 | 1480 | |
2fc84311 XG |
1481 | might_sleep(); |
1482 | ||
1483 | if (writable) | |
1484 | *writable = write_fault; | |
1485 | ||
ce53053c AV |
1486 | if (write_fault) |
1487 | flags |= FOLL_WRITE; | |
1488 | if (async) | |
1489 | flags |= FOLL_NOWAIT; | |
d4944b0e | 1490 | |
ce53053c | 1491 | npages = get_user_pages_unlocked(addr, 1, &page, flags); |
2fc84311 XG |
1492 | if (npages != 1) |
1493 | return npages; | |
1494 | ||
1495 | /* map read fault as writable if possible */ | |
12ce13fe | 1496 | if (unlikely(!write_fault) && writable) { |
ce53053c | 1497 | struct page *wpage; |
2fc84311 | 1498 | |
ce53053c | 1499 | if (__get_user_pages_fast(addr, 1, 1, &wpage) == 1) { |
2fc84311 | 1500 | *writable = true; |
ce53053c AV |
1501 | put_page(page); |
1502 | page = wpage; | |
612819c3 | 1503 | } |
887c08ac | 1504 | } |
ce53053c | 1505 | *pfn = page_to_pfn(page); |
2fc84311 XG |
1506 | return npages; |
1507 | } | |
539cb660 | 1508 | |
4d8b81ab XG |
1509 | static bool vma_is_valid(struct vm_area_struct *vma, bool write_fault) |
1510 | { | |
1511 | if (unlikely(!(vma->vm_flags & VM_READ))) | |
1512 | return false; | |
2e2e3738 | 1513 | |
4d8b81ab XG |
1514 | if (write_fault && (unlikely(!(vma->vm_flags & VM_WRITE)))) |
1515 | return false; | |
887c08ac | 1516 | |
4d8b81ab XG |
1517 | return true; |
1518 | } | |
bf998156 | 1519 | |
92176a8e PB |
1520 | static int hva_to_pfn_remapped(struct vm_area_struct *vma, |
1521 | unsigned long addr, bool *async, | |
a340b3e2 KA |
1522 | bool write_fault, bool *writable, |
1523 | kvm_pfn_t *p_pfn) | |
92176a8e | 1524 | { |
add6a0cd PB |
1525 | unsigned long pfn; |
1526 | int r; | |
1527 | ||
1528 | r = follow_pfn(vma, addr, &pfn); | |
1529 | if (r) { | |
1530 | /* | |
1531 | * get_user_pages fails for VM_IO and VM_PFNMAP vmas and does | |
1532 | * not call the fault handler, so do it here. | |
1533 | */ | |
1534 | bool unlocked = false; | |
1535 | r = fixup_user_fault(current, current->mm, addr, | |
1536 | (write_fault ? FAULT_FLAG_WRITE : 0), | |
1537 | &unlocked); | |
1538 | if (unlocked) | |
1539 | return -EAGAIN; | |
1540 | if (r) | |
1541 | return r; | |
1542 | ||
1543 | r = follow_pfn(vma, addr, &pfn); | |
1544 | if (r) | |
1545 | return r; | |
1546 | ||
1547 | } | |
1548 | ||
a340b3e2 KA |
1549 | if (writable) |
1550 | *writable = true; | |
add6a0cd PB |
1551 | |
1552 | /* | |
1553 | * Get a reference here because callers of *hva_to_pfn* and | |
1554 | * *gfn_to_pfn* ultimately call kvm_release_pfn_clean on the | |
1555 | * returned pfn. This is only needed if the VMA has VM_MIXEDMAP | |
1556 | * set, but the kvm_get_pfn/kvm_release_pfn_clean pair will | |
1557 | * simply do nothing for reserved pfns. | |
1558 | * | |
1559 | * Whoever called remap_pfn_range is also going to call e.g. | |
1560 | * unmap_mapping_range before the underlying pages are freed, | |
1561 | * causing a call to our MMU notifier. | |
1562 | */ | |
1563 | kvm_get_pfn(pfn); | |
1564 | ||
1565 | *p_pfn = pfn; | |
92176a8e PB |
1566 | return 0; |
1567 | } | |
1568 | ||
12ce13fe XG |
1569 | /* |
1570 | * Pin guest page in memory and return its pfn. | |
1571 | * @addr: host virtual address which maps memory to the guest | |
1572 | * @atomic: whether this function can sleep | |
1573 | * @async: whether this function need to wait IO complete if the | |
1574 | * host page is not in the memory | |
1575 | * @write_fault: whether we should get a writable host page | |
1576 | * @writable: whether it allows to map a writable host page for !@write_fault | |
1577 | * | |
1578 | * The function will map a writable host page for these two cases: | |
1579 | * 1): @write_fault = true | |
1580 | * 2): @write_fault = false && @writable, @writable will tell the caller | |
1581 | * whether the mapping is writable. | |
1582 | */ | |
ba049e93 | 1583 | static kvm_pfn_t hva_to_pfn(unsigned long addr, bool atomic, bool *async, |
2fc84311 XG |
1584 | bool write_fault, bool *writable) |
1585 | { | |
1586 | struct vm_area_struct *vma; | |
ba049e93 | 1587 | kvm_pfn_t pfn = 0; |
92176a8e | 1588 | int npages, r; |
2e2e3738 | 1589 | |
2fc84311 XG |
1590 | /* we can do it either atomically or asynchronously, not both */ |
1591 | BUG_ON(atomic && async); | |
8d4e1288 | 1592 | |
b9b33da2 | 1593 | if (hva_to_pfn_fast(addr, write_fault, writable, &pfn)) |
2fc84311 XG |
1594 | return pfn; |
1595 | ||
1596 | if (atomic) | |
1597 | return KVM_PFN_ERR_FAULT; | |
1598 | ||
1599 | npages = hva_to_pfn_slow(addr, async, write_fault, writable, &pfn); | |
1600 | if (npages == 1) | |
1601 | return pfn; | |
8d4e1288 | 1602 | |
2fc84311 XG |
1603 | down_read(¤t->mm->mmap_sem); |
1604 | if (npages == -EHWPOISON || | |
1605 | (!async && check_user_page_hwpoison(addr))) { | |
1606 | pfn = KVM_PFN_ERR_HWPOISON; | |
1607 | goto exit; | |
1608 | } | |
1609 | ||
add6a0cd | 1610 | retry: |
2fc84311 XG |
1611 | vma = find_vma_intersection(current->mm, addr, addr + 1); |
1612 | ||
1613 | if (vma == NULL) | |
1614 | pfn = KVM_PFN_ERR_FAULT; | |
92176a8e | 1615 | else if (vma->vm_flags & (VM_IO | VM_PFNMAP)) { |
a340b3e2 | 1616 | r = hva_to_pfn_remapped(vma, addr, async, write_fault, writable, &pfn); |
add6a0cd PB |
1617 | if (r == -EAGAIN) |
1618 | goto retry; | |
92176a8e PB |
1619 | if (r < 0) |
1620 | pfn = KVM_PFN_ERR_FAULT; | |
2fc84311 | 1621 | } else { |
4d8b81ab | 1622 | if (async && vma_is_valid(vma, write_fault)) |
2fc84311 XG |
1623 | *async = true; |
1624 | pfn = KVM_PFN_ERR_FAULT; | |
1625 | } | |
1626 | exit: | |
1627 | up_read(¤t->mm->mmap_sem); | |
2e2e3738 | 1628 | return pfn; |
35149e21 AL |
1629 | } |
1630 | ||
ba049e93 DW |
1631 | kvm_pfn_t __gfn_to_pfn_memslot(struct kvm_memory_slot *slot, gfn_t gfn, |
1632 | bool atomic, bool *async, bool write_fault, | |
1633 | bool *writable) | |
887c08ac | 1634 | { |
4d8b81ab XG |
1635 | unsigned long addr = __gfn_to_hva_many(slot, gfn, NULL, write_fault); |
1636 | ||
b2740d35 PB |
1637 | if (addr == KVM_HVA_ERR_RO_BAD) { |
1638 | if (writable) | |
1639 | *writable = false; | |
4d8b81ab | 1640 | return KVM_PFN_ERR_RO_FAULT; |
b2740d35 | 1641 | } |
4d8b81ab | 1642 | |
b2740d35 PB |
1643 | if (kvm_is_error_hva(addr)) { |
1644 | if (writable) | |
1645 | *writable = false; | |
81c52c56 | 1646 | return KVM_PFN_NOSLOT; |
b2740d35 | 1647 | } |
4d8b81ab XG |
1648 | |
1649 | /* Do not map writable pfn in the readonly memslot. */ | |
1650 | if (writable && memslot_is_readonly(slot)) { | |
1651 | *writable = false; | |
1652 | writable = NULL; | |
1653 | } | |
1654 | ||
1655 | return hva_to_pfn(addr, atomic, async, write_fault, | |
1656 | writable); | |
887c08ac | 1657 | } |
3520469d | 1658 | EXPORT_SYMBOL_GPL(__gfn_to_pfn_memslot); |
887c08ac | 1659 | |
ba049e93 | 1660 | kvm_pfn_t gfn_to_pfn_prot(struct kvm *kvm, gfn_t gfn, bool write_fault, |
612819c3 MT |
1661 | bool *writable) |
1662 | { | |
e37afc6e PB |
1663 | return __gfn_to_pfn_memslot(gfn_to_memslot(kvm, gfn), gfn, false, NULL, |
1664 | write_fault, writable); | |
612819c3 MT |
1665 | } |
1666 | EXPORT_SYMBOL_GPL(gfn_to_pfn_prot); | |
1667 | ||
ba049e93 | 1668 | kvm_pfn_t gfn_to_pfn_memslot(struct kvm_memory_slot *slot, gfn_t gfn) |
506f0d6f | 1669 | { |
4d8b81ab | 1670 | return __gfn_to_pfn_memslot(slot, gfn, false, NULL, true, NULL); |
506f0d6f | 1671 | } |
e37afc6e | 1672 | EXPORT_SYMBOL_GPL(gfn_to_pfn_memslot); |
506f0d6f | 1673 | |
ba049e93 | 1674 | kvm_pfn_t gfn_to_pfn_memslot_atomic(struct kvm_memory_slot *slot, gfn_t gfn) |
506f0d6f | 1675 | { |
4d8b81ab | 1676 | return __gfn_to_pfn_memslot(slot, gfn, true, NULL, true, NULL); |
506f0d6f | 1677 | } |
037d92dc | 1678 | EXPORT_SYMBOL_GPL(gfn_to_pfn_memslot_atomic); |
506f0d6f | 1679 | |
ba049e93 | 1680 | kvm_pfn_t gfn_to_pfn_atomic(struct kvm *kvm, gfn_t gfn) |
e37afc6e PB |
1681 | { |
1682 | return gfn_to_pfn_memslot_atomic(gfn_to_memslot(kvm, gfn), gfn); | |
1683 | } | |
1684 | EXPORT_SYMBOL_GPL(gfn_to_pfn_atomic); | |
1685 | ||
ba049e93 | 1686 | kvm_pfn_t kvm_vcpu_gfn_to_pfn_atomic(struct kvm_vcpu *vcpu, gfn_t gfn) |
8e73485c PB |
1687 | { |
1688 | return gfn_to_pfn_memslot_atomic(kvm_vcpu_gfn_to_memslot(vcpu, gfn), gfn); | |
1689 | } | |
1690 | EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_pfn_atomic); | |
1691 | ||
ba049e93 | 1692 | kvm_pfn_t gfn_to_pfn(struct kvm *kvm, gfn_t gfn) |
e37afc6e PB |
1693 | { |
1694 | return gfn_to_pfn_memslot(gfn_to_memslot(kvm, gfn), gfn); | |
1695 | } | |
1696 | EXPORT_SYMBOL_GPL(gfn_to_pfn); | |
1697 | ||
ba049e93 | 1698 | kvm_pfn_t kvm_vcpu_gfn_to_pfn(struct kvm_vcpu *vcpu, gfn_t gfn) |
8e73485c PB |
1699 | { |
1700 | return gfn_to_pfn_memslot(kvm_vcpu_gfn_to_memslot(vcpu, gfn), gfn); | |
1701 | } | |
1702 | EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_pfn); | |
1703 | ||
d9ef13c2 PB |
1704 | int gfn_to_page_many_atomic(struct kvm_memory_slot *slot, gfn_t gfn, |
1705 | struct page **pages, int nr_pages) | |
48987781 XG |
1706 | { |
1707 | unsigned long addr; | |
076b925d | 1708 | gfn_t entry = 0; |
48987781 | 1709 | |
d9ef13c2 | 1710 | addr = gfn_to_hva_many(slot, gfn, &entry); |
48987781 XG |
1711 | if (kvm_is_error_hva(addr)) |
1712 | return -1; | |
1713 | ||
1714 | if (entry < nr_pages) | |
1715 | return 0; | |
1716 | ||
1717 | return __get_user_pages_fast(addr, nr_pages, 1, pages); | |
1718 | } | |
1719 | EXPORT_SYMBOL_GPL(gfn_to_page_many_atomic); | |
1720 | ||
ba049e93 | 1721 | static struct page *kvm_pfn_to_page(kvm_pfn_t pfn) |
a2766325 | 1722 | { |
81c52c56 | 1723 | if (is_error_noslot_pfn(pfn)) |
cb9aaa30 | 1724 | return KVM_ERR_PTR_BAD_PAGE; |
a2766325 | 1725 | |
bf4bea8e | 1726 | if (kvm_is_reserved_pfn(pfn)) { |
cb9aaa30 | 1727 | WARN_ON(1); |
6cede2e6 | 1728 | return KVM_ERR_PTR_BAD_PAGE; |
cb9aaa30 | 1729 | } |
a2766325 XG |
1730 | |
1731 | return pfn_to_page(pfn); | |
1732 | } | |
1733 | ||
35149e21 AL |
1734 | struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn) |
1735 | { | |
ba049e93 | 1736 | kvm_pfn_t pfn; |
2e2e3738 AL |
1737 | |
1738 | pfn = gfn_to_pfn(kvm, gfn); | |
2e2e3738 | 1739 | |
a2766325 | 1740 | return kvm_pfn_to_page(pfn); |
954bbbc2 AK |
1741 | } |
1742 | EXPORT_SYMBOL_GPL(gfn_to_page); | |
1743 | ||
8e73485c PB |
1744 | struct page *kvm_vcpu_gfn_to_page(struct kvm_vcpu *vcpu, gfn_t gfn) |
1745 | { | |
ba049e93 | 1746 | kvm_pfn_t pfn; |
8e73485c PB |
1747 | |
1748 | pfn = kvm_vcpu_gfn_to_pfn(vcpu, gfn); | |
1749 | ||
1750 | return kvm_pfn_to_page(pfn); | |
1751 | } | |
1752 | EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_page); | |
1753 | ||
b4231d61 IE |
1754 | void kvm_release_page_clean(struct page *page) |
1755 | { | |
32cad84f XG |
1756 | WARN_ON(is_error_page(page)); |
1757 | ||
35149e21 | 1758 | kvm_release_pfn_clean(page_to_pfn(page)); |
b4231d61 IE |
1759 | } |
1760 | EXPORT_SYMBOL_GPL(kvm_release_page_clean); | |
1761 | ||
ba049e93 | 1762 | void kvm_release_pfn_clean(kvm_pfn_t pfn) |
35149e21 | 1763 | { |
bf4bea8e | 1764 | if (!is_error_noslot_pfn(pfn) && !kvm_is_reserved_pfn(pfn)) |
2e2e3738 | 1765 | put_page(pfn_to_page(pfn)); |
35149e21 AL |
1766 | } |
1767 | EXPORT_SYMBOL_GPL(kvm_release_pfn_clean); | |
1768 | ||
b4231d61 | 1769 | void kvm_release_page_dirty(struct page *page) |
8a7ae055 | 1770 | { |
a2766325 XG |
1771 | WARN_ON(is_error_page(page)); |
1772 | ||
35149e21 AL |
1773 | kvm_release_pfn_dirty(page_to_pfn(page)); |
1774 | } | |
1775 | EXPORT_SYMBOL_GPL(kvm_release_page_dirty); | |
1776 | ||
f7a6509f | 1777 | void kvm_release_pfn_dirty(kvm_pfn_t pfn) |
35149e21 AL |
1778 | { |
1779 | kvm_set_pfn_dirty(pfn); | |
1780 | kvm_release_pfn_clean(pfn); | |
1781 | } | |
f7a6509f | 1782 | EXPORT_SYMBOL_GPL(kvm_release_pfn_dirty); |
35149e21 | 1783 | |
ba049e93 | 1784 | void kvm_set_pfn_dirty(kvm_pfn_t pfn) |
35149e21 | 1785 | { |
bf4bea8e | 1786 | if (!kvm_is_reserved_pfn(pfn)) { |
2e2e3738 | 1787 | struct page *page = pfn_to_page(pfn); |
f95ef0cd | 1788 | |
2e2e3738 AL |
1789 | if (!PageReserved(page)) |
1790 | SetPageDirty(page); | |
1791 | } | |
8a7ae055 | 1792 | } |
35149e21 AL |
1793 | EXPORT_SYMBOL_GPL(kvm_set_pfn_dirty); |
1794 | ||
ba049e93 | 1795 | void kvm_set_pfn_accessed(kvm_pfn_t pfn) |
35149e21 | 1796 | { |
bf4bea8e | 1797 | if (!kvm_is_reserved_pfn(pfn)) |
2e2e3738 | 1798 | mark_page_accessed(pfn_to_page(pfn)); |
35149e21 AL |
1799 | } |
1800 | EXPORT_SYMBOL_GPL(kvm_set_pfn_accessed); | |
1801 | ||
ba049e93 | 1802 | void kvm_get_pfn(kvm_pfn_t pfn) |
35149e21 | 1803 | { |
bf4bea8e | 1804 | if (!kvm_is_reserved_pfn(pfn)) |
2e2e3738 | 1805 | get_page(pfn_to_page(pfn)); |
35149e21 AL |
1806 | } |
1807 | EXPORT_SYMBOL_GPL(kvm_get_pfn); | |
8a7ae055 | 1808 | |
195aefde IE |
1809 | static int next_segment(unsigned long len, int offset) |
1810 | { | |
1811 | if (len > PAGE_SIZE - offset) | |
1812 | return PAGE_SIZE - offset; | |
1813 | else | |
1814 | return len; | |
1815 | } | |
1816 | ||
8e73485c PB |
1817 | static int __kvm_read_guest_page(struct kvm_memory_slot *slot, gfn_t gfn, |
1818 | void *data, int offset, int len) | |
195aefde | 1819 | { |
e0506bcb IE |
1820 | int r; |
1821 | unsigned long addr; | |
195aefde | 1822 | |
8e73485c | 1823 | addr = gfn_to_hva_memslot_prot(slot, gfn, NULL); |
e0506bcb IE |
1824 | if (kvm_is_error_hva(addr)) |
1825 | return -EFAULT; | |
3180a7fc | 1826 | r = __copy_from_user(data, (void __user *)addr + offset, len); |
e0506bcb | 1827 | if (r) |
195aefde | 1828 | return -EFAULT; |
195aefde IE |
1829 | return 0; |
1830 | } | |
8e73485c PB |
1831 | |
1832 | int kvm_read_guest_page(struct kvm *kvm, gfn_t gfn, void *data, int offset, | |
1833 | int len) | |
1834 | { | |
1835 | struct kvm_memory_slot *slot = gfn_to_memslot(kvm, gfn); | |
1836 | ||
1837 | return __kvm_read_guest_page(slot, gfn, data, offset, len); | |
1838 | } | |
195aefde IE |
1839 | EXPORT_SYMBOL_GPL(kvm_read_guest_page); |
1840 | ||
8e73485c PB |
1841 | int kvm_vcpu_read_guest_page(struct kvm_vcpu *vcpu, gfn_t gfn, void *data, |
1842 | int offset, int len) | |
1843 | { | |
1844 | struct kvm_memory_slot *slot = kvm_vcpu_gfn_to_memslot(vcpu, gfn); | |
1845 | ||
1846 | return __kvm_read_guest_page(slot, gfn, data, offset, len); | |
1847 | } | |
1848 | EXPORT_SYMBOL_GPL(kvm_vcpu_read_guest_page); | |
1849 | ||
195aefde IE |
1850 | int kvm_read_guest(struct kvm *kvm, gpa_t gpa, void *data, unsigned long len) |
1851 | { | |
1852 | gfn_t gfn = gpa >> PAGE_SHIFT; | |
1853 | int seg; | |
1854 | int offset = offset_in_page(gpa); | |
1855 | int ret; | |
1856 | ||
1857 | while ((seg = next_segment(len, offset)) != 0) { | |
1858 | ret = kvm_read_guest_page(kvm, gfn, data, offset, seg); | |
1859 | if (ret < 0) | |
1860 | return ret; | |
1861 | offset = 0; | |
1862 | len -= seg; | |
1863 | data += seg; | |
1864 | ++gfn; | |
1865 | } | |
1866 | return 0; | |
1867 | } | |
1868 | EXPORT_SYMBOL_GPL(kvm_read_guest); | |
1869 | ||
8e73485c | 1870 | int kvm_vcpu_read_guest(struct kvm_vcpu *vcpu, gpa_t gpa, void *data, unsigned long len) |
7ec54588 | 1871 | { |
7ec54588 | 1872 | gfn_t gfn = gpa >> PAGE_SHIFT; |
8e73485c | 1873 | int seg; |
7ec54588 | 1874 | int offset = offset_in_page(gpa); |
8e73485c PB |
1875 | int ret; |
1876 | ||
1877 | while ((seg = next_segment(len, offset)) != 0) { | |
1878 | ret = kvm_vcpu_read_guest_page(vcpu, gfn, data, offset, seg); | |
1879 | if (ret < 0) | |
1880 | return ret; | |
1881 | offset = 0; | |
1882 | len -= seg; | |
1883 | data += seg; | |
1884 | ++gfn; | |
1885 | } | |
1886 | return 0; | |
1887 | } | |
1888 | EXPORT_SYMBOL_GPL(kvm_vcpu_read_guest); | |
7ec54588 | 1889 | |
8e73485c PB |
1890 | static int __kvm_read_guest_atomic(struct kvm_memory_slot *slot, gfn_t gfn, |
1891 | void *data, int offset, unsigned long len) | |
1892 | { | |
1893 | int r; | |
1894 | unsigned long addr; | |
1895 | ||
1896 | addr = gfn_to_hva_memslot_prot(slot, gfn, NULL); | |
7ec54588 MT |
1897 | if (kvm_is_error_hva(addr)) |
1898 | return -EFAULT; | |
0aac03f0 | 1899 | pagefault_disable(); |
3180a7fc | 1900 | r = __copy_from_user_inatomic(data, (void __user *)addr + offset, len); |
0aac03f0 | 1901 | pagefault_enable(); |
7ec54588 MT |
1902 | if (r) |
1903 | return -EFAULT; | |
1904 | return 0; | |
1905 | } | |
7ec54588 | 1906 | |
8e73485c PB |
1907 | int kvm_read_guest_atomic(struct kvm *kvm, gpa_t gpa, void *data, |
1908 | unsigned long len) | |
1909 | { | |
1910 | gfn_t gfn = gpa >> PAGE_SHIFT; | |
1911 | struct kvm_memory_slot *slot = gfn_to_memslot(kvm, gfn); | |
1912 | int offset = offset_in_page(gpa); | |
1913 | ||
1914 | return __kvm_read_guest_atomic(slot, gfn, data, offset, len); | |
1915 | } | |
1916 | EXPORT_SYMBOL_GPL(kvm_read_guest_atomic); | |
1917 | ||
1918 | int kvm_vcpu_read_guest_atomic(struct kvm_vcpu *vcpu, gpa_t gpa, | |
1919 | void *data, unsigned long len) | |
1920 | { | |
1921 | gfn_t gfn = gpa >> PAGE_SHIFT; | |
1922 | struct kvm_memory_slot *slot = kvm_vcpu_gfn_to_memslot(vcpu, gfn); | |
1923 | int offset = offset_in_page(gpa); | |
1924 | ||
1925 | return __kvm_read_guest_atomic(slot, gfn, data, offset, len); | |
1926 | } | |
1927 | EXPORT_SYMBOL_GPL(kvm_vcpu_read_guest_atomic); | |
1928 | ||
1929 | static int __kvm_write_guest_page(struct kvm_memory_slot *memslot, gfn_t gfn, | |
1930 | const void *data, int offset, int len) | |
195aefde | 1931 | { |
e0506bcb IE |
1932 | int r; |
1933 | unsigned long addr; | |
195aefde | 1934 | |
251eb841 | 1935 | addr = gfn_to_hva_memslot(memslot, gfn); |
e0506bcb IE |
1936 | if (kvm_is_error_hva(addr)) |
1937 | return -EFAULT; | |
8b0cedff | 1938 | r = __copy_to_user((void __user *)addr + offset, data, len); |
e0506bcb | 1939 | if (r) |
195aefde | 1940 | return -EFAULT; |
bc009e43 | 1941 | mark_page_dirty_in_slot(memslot, gfn); |
195aefde IE |
1942 | return 0; |
1943 | } | |
8e73485c PB |
1944 | |
1945 | int kvm_write_guest_page(struct kvm *kvm, gfn_t gfn, | |
1946 | const void *data, int offset, int len) | |
1947 | { | |
1948 | struct kvm_memory_slot *slot = gfn_to_memslot(kvm, gfn); | |
1949 | ||
1950 | return __kvm_write_guest_page(slot, gfn, data, offset, len); | |
1951 | } | |
195aefde IE |
1952 | EXPORT_SYMBOL_GPL(kvm_write_guest_page); |
1953 | ||
8e73485c PB |
1954 | int kvm_vcpu_write_guest_page(struct kvm_vcpu *vcpu, gfn_t gfn, |
1955 | const void *data, int offset, int len) | |
1956 | { | |
1957 | struct kvm_memory_slot *slot = kvm_vcpu_gfn_to_memslot(vcpu, gfn); | |
1958 | ||
1959 | return __kvm_write_guest_page(slot, gfn, data, offset, len); | |
1960 | } | |
1961 | EXPORT_SYMBOL_GPL(kvm_vcpu_write_guest_page); | |
1962 | ||
195aefde IE |
1963 | int kvm_write_guest(struct kvm *kvm, gpa_t gpa, const void *data, |
1964 | unsigned long len) | |
1965 | { | |
1966 | gfn_t gfn = gpa >> PAGE_SHIFT; | |
1967 | int seg; | |
1968 | int offset = offset_in_page(gpa); | |
1969 | int ret; | |
1970 | ||
1971 | while ((seg = next_segment(len, offset)) != 0) { | |
1972 | ret = kvm_write_guest_page(kvm, gfn, data, offset, seg); | |
1973 | if (ret < 0) | |
1974 | return ret; | |
1975 | offset = 0; | |
1976 | len -= seg; | |
1977 | data += seg; | |
1978 | ++gfn; | |
1979 | } | |
1980 | return 0; | |
1981 | } | |
ff651cb6 | 1982 | EXPORT_SYMBOL_GPL(kvm_write_guest); |
195aefde | 1983 | |
8e73485c PB |
1984 | int kvm_vcpu_write_guest(struct kvm_vcpu *vcpu, gpa_t gpa, const void *data, |
1985 | unsigned long len) | |
1986 | { | |
1987 | gfn_t gfn = gpa >> PAGE_SHIFT; | |
1988 | int seg; | |
1989 | int offset = offset_in_page(gpa); | |
1990 | int ret; | |
1991 | ||
1992 | while ((seg = next_segment(len, offset)) != 0) { | |
1993 | ret = kvm_vcpu_write_guest_page(vcpu, gfn, data, offset, seg); | |
1994 | if (ret < 0) | |
1995 | return ret; | |
1996 | offset = 0; | |
1997 | len -= seg; | |
1998 | data += seg; | |
1999 | ++gfn; | |
2000 | } | |
2001 | return 0; | |
2002 | } | |
2003 | EXPORT_SYMBOL_GPL(kvm_vcpu_write_guest); | |
2004 | ||
5a2d4365 PB |
2005 | static int __kvm_gfn_to_hva_cache_init(struct kvm_memslots *slots, |
2006 | struct gfn_to_hva_cache *ghc, | |
2007 | gpa_t gpa, unsigned long len) | |
49c7754c | 2008 | { |
49c7754c | 2009 | int offset = offset_in_page(gpa); |
8f964525 AH |
2010 | gfn_t start_gfn = gpa >> PAGE_SHIFT; |
2011 | gfn_t end_gfn = (gpa + len - 1) >> PAGE_SHIFT; | |
2012 | gfn_t nr_pages_needed = end_gfn - start_gfn + 1; | |
2013 | gfn_t nr_pages_avail; | |
f1b9dd5e | 2014 | int r = start_gfn <= end_gfn ? 0 : -EINVAL; |
49c7754c GN |
2015 | |
2016 | ghc->gpa = gpa; | |
2017 | ghc->generation = slots->generation; | |
8f964525 | 2018 | ghc->len = len; |
f1b9dd5e JM |
2019 | ghc->hva = KVM_HVA_ERR_BAD; |
2020 | ||
2021 | /* | |
2022 | * If the requested region crosses two memslots, we still | |
2023 | * verify that the entire region is valid here. | |
2024 | */ | |
2025 | while (!r && start_gfn <= end_gfn) { | |
2026 | ghc->memslot = __gfn_to_memslot(slots, start_gfn); | |
2027 | ghc->hva = gfn_to_hva_many(ghc->memslot, start_gfn, | |
2028 | &nr_pages_avail); | |
2029 | if (kvm_is_error_hva(ghc->hva)) | |
2030 | r = -EFAULT; | |
2031 | start_gfn += nr_pages_avail; | |
2032 | } | |
2033 | ||
2034 | /* Use the slow path for cross page reads and writes. */ | |
2035 | if (!r && nr_pages_needed == 1) | |
49c7754c | 2036 | ghc->hva += offset; |
f1b9dd5e | 2037 | else |
8f964525 | 2038 | ghc->memslot = NULL; |
f1b9dd5e JM |
2039 | |
2040 | return r; | |
49c7754c | 2041 | } |
5a2d4365 | 2042 | |
4e335d9e | 2043 | int kvm_gfn_to_hva_cache_init(struct kvm *kvm, struct gfn_to_hva_cache *ghc, |
5a2d4365 PB |
2044 | gpa_t gpa, unsigned long len) |
2045 | { | |
4e335d9e | 2046 | struct kvm_memslots *slots = kvm_memslots(kvm); |
5a2d4365 PB |
2047 | return __kvm_gfn_to_hva_cache_init(slots, ghc, gpa, len); |
2048 | } | |
4e335d9e | 2049 | EXPORT_SYMBOL_GPL(kvm_gfn_to_hva_cache_init); |
49c7754c | 2050 | |
4e335d9e | 2051 | int kvm_write_guest_offset_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc, |
7a86dab8 JM |
2052 | void *data, unsigned int offset, |
2053 | unsigned long len) | |
49c7754c | 2054 | { |
4e335d9e | 2055 | struct kvm_memslots *slots = kvm_memslots(kvm); |
49c7754c | 2056 | int r; |
4ec6e863 | 2057 | gpa_t gpa = ghc->gpa + offset; |
49c7754c | 2058 | |
4ec6e863 | 2059 | BUG_ON(len + offset > ghc->len); |
8f964525 | 2060 | |
49c7754c | 2061 | if (slots->generation != ghc->generation) |
5a2d4365 | 2062 | __kvm_gfn_to_hva_cache_init(slots, ghc, ghc->gpa, ghc->len); |
8f964525 AH |
2063 | |
2064 | if (unlikely(!ghc->memslot)) | |
4e335d9e | 2065 | return kvm_write_guest(kvm, gpa, data, len); |
49c7754c GN |
2066 | |
2067 | if (kvm_is_error_hva(ghc->hva)) | |
2068 | return -EFAULT; | |
2069 | ||
4ec6e863 | 2070 | r = __copy_to_user((void __user *)ghc->hva + offset, data, len); |
49c7754c GN |
2071 | if (r) |
2072 | return -EFAULT; | |
4ec6e863 | 2073 | mark_page_dirty_in_slot(ghc->memslot, gpa >> PAGE_SHIFT); |
49c7754c GN |
2074 | |
2075 | return 0; | |
2076 | } | |
4e335d9e | 2077 | EXPORT_SYMBOL_GPL(kvm_write_guest_offset_cached); |
4ec6e863 | 2078 | |
4e335d9e PB |
2079 | int kvm_write_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc, |
2080 | void *data, unsigned long len) | |
4ec6e863 | 2081 | { |
4e335d9e | 2082 | return kvm_write_guest_offset_cached(kvm, ghc, data, 0, len); |
4ec6e863 | 2083 | } |
4e335d9e | 2084 | EXPORT_SYMBOL_GPL(kvm_write_guest_cached); |
49c7754c | 2085 | |
4e335d9e PB |
2086 | int kvm_read_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc, |
2087 | void *data, unsigned long len) | |
e03b644f | 2088 | { |
4e335d9e | 2089 | struct kvm_memslots *slots = kvm_memslots(kvm); |
e03b644f GN |
2090 | int r; |
2091 | ||
8f964525 AH |
2092 | BUG_ON(len > ghc->len); |
2093 | ||
e03b644f | 2094 | if (slots->generation != ghc->generation) |
5a2d4365 | 2095 | __kvm_gfn_to_hva_cache_init(slots, ghc, ghc->gpa, ghc->len); |
8f964525 AH |
2096 | |
2097 | if (unlikely(!ghc->memslot)) | |
4e335d9e | 2098 | return kvm_read_guest(kvm, ghc->gpa, data, len); |
e03b644f GN |
2099 | |
2100 | if (kvm_is_error_hva(ghc->hva)) | |
2101 | return -EFAULT; | |
2102 | ||
2103 | r = __copy_from_user(data, (void __user *)ghc->hva, len); | |
2104 | if (r) | |
2105 | return -EFAULT; | |
2106 | ||
2107 | return 0; | |
2108 | } | |
4e335d9e | 2109 | EXPORT_SYMBOL_GPL(kvm_read_guest_cached); |
e03b644f | 2110 | |
195aefde IE |
2111 | int kvm_clear_guest_page(struct kvm *kvm, gfn_t gfn, int offset, int len) |
2112 | { | |
8a3caa6d HC |
2113 | const void *zero_page = (const void *) __va(page_to_phys(ZERO_PAGE(0))); |
2114 | ||
2115 | return kvm_write_guest_page(kvm, gfn, zero_page, offset, len); | |
195aefde IE |
2116 | } |
2117 | EXPORT_SYMBOL_GPL(kvm_clear_guest_page); | |
2118 | ||
2119 | int kvm_clear_guest(struct kvm *kvm, gpa_t gpa, unsigned long len) | |
2120 | { | |
2121 | gfn_t gfn = gpa >> PAGE_SHIFT; | |
2122 | int seg; | |
2123 | int offset = offset_in_page(gpa); | |
2124 | int ret; | |
2125 | ||
bfda0e84 | 2126 | while ((seg = next_segment(len, offset)) != 0) { |
195aefde IE |
2127 | ret = kvm_clear_guest_page(kvm, gfn, offset, seg); |
2128 | if (ret < 0) | |
2129 | return ret; | |
2130 | offset = 0; | |
2131 | len -= seg; | |
2132 | ++gfn; | |
2133 | } | |
2134 | return 0; | |
2135 | } | |
2136 | EXPORT_SYMBOL_GPL(kvm_clear_guest); | |
2137 | ||
bc009e43 | 2138 | static void mark_page_dirty_in_slot(struct kvm_memory_slot *memslot, |
7940876e | 2139 | gfn_t gfn) |
6aa8b732 | 2140 | { |
7e9d619d RR |
2141 | if (memslot && memslot->dirty_bitmap) { |
2142 | unsigned long rel_gfn = gfn - memslot->base_gfn; | |
6aa8b732 | 2143 | |
b74ca3b3 | 2144 | set_bit_le(rel_gfn, memslot->dirty_bitmap); |
6aa8b732 AK |
2145 | } |
2146 | } | |
2147 | ||
49c7754c GN |
2148 | void mark_page_dirty(struct kvm *kvm, gfn_t gfn) |
2149 | { | |
2150 | struct kvm_memory_slot *memslot; | |
2151 | ||
2152 | memslot = gfn_to_memslot(kvm, gfn); | |
bc009e43 | 2153 | mark_page_dirty_in_slot(memslot, gfn); |
49c7754c | 2154 | } |
2ba9f0d8 | 2155 | EXPORT_SYMBOL_GPL(mark_page_dirty); |
49c7754c | 2156 | |
8e73485c PB |
2157 | void kvm_vcpu_mark_page_dirty(struct kvm_vcpu *vcpu, gfn_t gfn) |
2158 | { | |
2159 | struct kvm_memory_slot *memslot; | |
2160 | ||
2161 | memslot = kvm_vcpu_gfn_to_memslot(vcpu, gfn); | |
2162 | mark_page_dirty_in_slot(memslot, gfn); | |
2163 | } | |
2164 | EXPORT_SYMBOL_GPL(kvm_vcpu_mark_page_dirty); | |
2165 | ||
20b7035c JS |
2166 | void kvm_sigset_activate(struct kvm_vcpu *vcpu) |
2167 | { | |
2168 | if (!vcpu->sigset_active) | |
2169 | return; | |
2170 | ||
2171 | /* | |
2172 | * This does a lockless modification of ->real_blocked, which is fine | |
2173 | * because, only current can change ->real_blocked and all readers of | |
2174 | * ->real_blocked don't care as long ->real_blocked is always a subset | |
2175 | * of ->blocked. | |
2176 | */ | |
2177 | sigprocmask(SIG_SETMASK, &vcpu->sigset, ¤t->real_blocked); | |
2178 | } | |
2179 | ||
2180 | void kvm_sigset_deactivate(struct kvm_vcpu *vcpu) | |
2181 | { | |
2182 | if (!vcpu->sigset_active) | |
2183 | return; | |
2184 | ||
2185 | sigprocmask(SIG_SETMASK, ¤t->real_blocked, NULL); | |
2186 | sigemptyset(¤t->real_blocked); | |
2187 | } | |
2188 | ||
aca6ff29 WL |
2189 | static void grow_halt_poll_ns(struct kvm_vcpu *vcpu) |
2190 | { | |
6b6de68c | 2191 | unsigned int old, val, grow; |
aca6ff29 | 2192 | |
2cbd7824 | 2193 | old = val = vcpu->halt_poll_ns; |
6b6de68c | 2194 | grow = READ_ONCE(halt_poll_ns_grow); |
aca6ff29 | 2195 | /* 10us base */ |
6b6de68c | 2196 | if (val == 0 && grow) |
aca6ff29 WL |
2197 | val = 10000; |
2198 | else | |
6b6de68c | 2199 | val *= grow; |
aca6ff29 | 2200 | |
313f636d DM |
2201 | if (val > halt_poll_ns) |
2202 | val = halt_poll_ns; | |
2203 | ||
aca6ff29 | 2204 | vcpu->halt_poll_ns = val; |
2cbd7824 | 2205 | trace_kvm_halt_poll_ns_grow(vcpu->vcpu_id, val, old); |
aca6ff29 WL |
2206 | } |
2207 | ||
2208 | static void shrink_halt_poll_ns(struct kvm_vcpu *vcpu) | |
2209 | { | |
6b6de68c | 2210 | unsigned int old, val, shrink; |
aca6ff29 | 2211 | |
2cbd7824 | 2212 | old = val = vcpu->halt_poll_ns; |
6b6de68c CB |
2213 | shrink = READ_ONCE(halt_poll_ns_shrink); |
2214 | if (shrink == 0) | |
aca6ff29 WL |
2215 | val = 0; |
2216 | else | |
6b6de68c | 2217 | val /= shrink; |
aca6ff29 WL |
2218 | |
2219 | vcpu->halt_poll_ns = val; | |
2cbd7824 | 2220 | trace_kvm_halt_poll_ns_shrink(vcpu->vcpu_id, val, old); |
aca6ff29 WL |
2221 | } |
2222 | ||
f7819512 PB |
2223 | static int kvm_vcpu_check_block(struct kvm_vcpu *vcpu) |
2224 | { | |
50c28f21 JS |
2225 | int ret = -EINTR; |
2226 | int idx = srcu_read_lock(&vcpu->kvm->srcu); | |
2227 | ||
f7819512 PB |
2228 | if (kvm_arch_vcpu_runnable(vcpu)) { |
2229 | kvm_make_request(KVM_REQ_UNHALT, vcpu); | |
50c28f21 | 2230 | goto out; |
f7819512 PB |
2231 | } |
2232 | if (kvm_cpu_has_pending_timer(vcpu)) | |
50c28f21 | 2233 | goto out; |
f7819512 | 2234 | if (signal_pending(current)) |
50c28f21 | 2235 | goto out; |
f7819512 | 2236 | |
50c28f21 JS |
2237 | ret = 0; |
2238 | out: | |
2239 | srcu_read_unlock(&vcpu->kvm->srcu, idx); | |
2240 | return ret; | |
f7819512 PB |
2241 | } |
2242 | ||
b6958ce4 ED |
2243 | /* |
2244 | * The vCPU has executed a HLT instruction with in-kernel mode enabled. | |
2245 | */ | |
8776e519 | 2246 | void kvm_vcpu_block(struct kvm_vcpu *vcpu) |
d3bef15f | 2247 | { |
f7819512 | 2248 | ktime_t start, cur; |
8577370f | 2249 | DECLARE_SWAITQUEUE(wait); |
f7819512 | 2250 | bool waited = false; |
aca6ff29 | 2251 | u64 block_ns; |
f7819512 PB |
2252 | |
2253 | start = cur = ktime_get(); | |
19020f8a WL |
2254 | if (vcpu->halt_poll_ns) { |
2255 | ktime_t stop = ktime_add_ns(ktime_get(), vcpu->halt_poll_ns); | |
f95ef0cd | 2256 | |
62bea5bf | 2257 | ++vcpu->stat.halt_attempted_poll; |
f7819512 PB |
2258 | do { |
2259 | /* | |
2260 | * This sets KVM_REQ_UNHALT if an interrupt | |
2261 | * arrives. | |
2262 | */ | |
2263 | if (kvm_vcpu_check_block(vcpu) < 0) { | |
2264 | ++vcpu->stat.halt_successful_poll; | |
3491caf2 CB |
2265 | if (!vcpu_valid_wakeup(vcpu)) |
2266 | ++vcpu->stat.halt_poll_invalid; | |
f7819512 PB |
2267 | goto out; |
2268 | } | |
2269 | cur = ktime_get(); | |
2270 | } while (single_task_running() && ktime_before(cur, stop)); | |
2271 | } | |
e5c239cf | 2272 | |
3217f7c2 CD |
2273 | kvm_arch_vcpu_blocking(vcpu); |
2274 | ||
e5c239cf | 2275 | for (;;) { |
b3dae109 | 2276 | prepare_to_swait_exclusive(&vcpu->wq, &wait, TASK_INTERRUPTIBLE); |
e5c239cf | 2277 | |
f7819512 | 2278 | if (kvm_vcpu_check_block(vcpu) < 0) |
e5c239cf MT |
2279 | break; |
2280 | ||
f7819512 | 2281 | waited = true; |
b6958ce4 | 2282 | schedule(); |
b6958ce4 | 2283 | } |
d3bef15f | 2284 | |
8577370f | 2285 | finish_swait(&vcpu->wq, &wait); |
f7819512 PB |
2286 | cur = ktime_get(); |
2287 | ||
3217f7c2 | 2288 | kvm_arch_vcpu_unblocking(vcpu); |
f7819512 | 2289 | out: |
aca6ff29 WL |
2290 | block_ns = ktime_to_ns(cur) - ktime_to_ns(start); |
2291 | ||
2086d320 CB |
2292 | if (!vcpu_valid_wakeup(vcpu)) |
2293 | shrink_halt_poll_ns(vcpu); | |
2294 | else if (halt_poll_ns) { | |
aca6ff29 WL |
2295 | if (block_ns <= vcpu->halt_poll_ns) |
2296 | ; | |
2297 | /* we had a long block, shrink polling */ | |
2086d320 | 2298 | else if (vcpu->halt_poll_ns && block_ns > halt_poll_ns) |
aca6ff29 WL |
2299 | shrink_halt_poll_ns(vcpu); |
2300 | /* we had a short halt and our poll time is too small */ | |
2301 | else if (vcpu->halt_poll_ns < halt_poll_ns && | |
2302 | block_ns < halt_poll_ns) | |
2303 | grow_halt_poll_ns(vcpu); | |
edb9272f WL |
2304 | } else |
2305 | vcpu->halt_poll_ns = 0; | |
aca6ff29 | 2306 | |
3491caf2 CB |
2307 | trace_kvm_vcpu_wakeup(block_ns, waited, vcpu_valid_wakeup(vcpu)); |
2308 | kvm_arch_vcpu_block_finish(vcpu); | |
b6958ce4 | 2309 | } |
2ba9f0d8 | 2310 | EXPORT_SYMBOL_GPL(kvm_vcpu_block); |
b6958ce4 | 2311 | |
178f02ff | 2312 | bool kvm_vcpu_wake_up(struct kvm_vcpu *vcpu) |
b6d33834 | 2313 | { |
8577370f | 2314 | struct swait_queue_head *wqp; |
b6d33834 CD |
2315 | |
2316 | wqp = kvm_arch_vcpu_wq(vcpu); | |
5e0018b3 | 2317 | if (swq_has_sleeper(wqp)) { |
b3dae109 | 2318 | swake_up_one(wqp); |
b6d33834 | 2319 | ++vcpu->stat.halt_wakeup; |
178f02ff | 2320 | return true; |
b6d33834 CD |
2321 | } |
2322 | ||
178f02ff | 2323 | return false; |
dd1a4cc1 RK |
2324 | } |
2325 | EXPORT_SYMBOL_GPL(kvm_vcpu_wake_up); | |
2326 | ||
0266c894 | 2327 | #ifndef CONFIG_S390 |
dd1a4cc1 RK |
2328 | /* |
2329 | * Kick a sleeping VCPU, or a guest VCPU in guest mode, into host kernel mode. | |
2330 | */ | |
2331 | void kvm_vcpu_kick(struct kvm_vcpu *vcpu) | |
2332 | { | |
2333 | int me; | |
2334 | int cpu = vcpu->cpu; | |
2335 | ||
178f02ff RK |
2336 | if (kvm_vcpu_wake_up(vcpu)) |
2337 | return; | |
2338 | ||
b6d33834 CD |
2339 | me = get_cpu(); |
2340 | if (cpu != me && (unsigned)cpu < nr_cpu_ids && cpu_online(cpu)) | |
2341 | if (kvm_arch_vcpu_should_kick(vcpu)) | |
2342 | smp_send_reschedule(cpu); | |
2343 | put_cpu(); | |
2344 | } | |
a20ed54d | 2345 | EXPORT_SYMBOL_GPL(kvm_vcpu_kick); |
0266c894 | 2346 | #endif /* !CONFIG_S390 */ |
b6d33834 | 2347 | |
fa93384f | 2348 | int kvm_vcpu_yield_to(struct kvm_vcpu *target) |
41628d33 KW |
2349 | { |
2350 | struct pid *pid; | |
2351 | struct task_struct *task = NULL; | |
fa93384f | 2352 | int ret = 0; |
41628d33 KW |
2353 | |
2354 | rcu_read_lock(); | |
2355 | pid = rcu_dereference(target->pid); | |
2356 | if (pid) | |
27fbe64b | 2357 | task = get_pid_task(pid, PIDTYPE_PID); |
41628d33 KW |
2358 | rcu_read_unlock(); |
2359 | if (!task) | |
c45c528e | 2360 | return ret; |
c45c528e | 2361 | ret = yield_to(task, 1); |
41628d33 | 2362 | put_task_struct(task); |
c45c528e R |
2363 | |
2364 | return ret; | |
41628d33 KW |
2365 | } |
2366 | EXPORT_SYMBOL_GPL(kvm_vcpu_yield_to); | |
2367 | ||
06e48c51 R |
2368 | /* |
2369 | * Helper that checks whether a VCPU is eligible for directed yield. | |
2370 | * Most eligible candidate to yield is decided by following heuristics: | |
2371 | * | |
2372 | * (a) VCPU which has not done pl-exit or cpu relax intercepted recently | |
2373 | * (preempted lock holder), indicated by @in_spin_loop. | |
2374 | * Set at the beiginning and cleared at the end of interception/PLE handler. | |
2375 | * | |
2376 | * (b) VCPU which has done pl-exit/ cpu relax intercepted but did not get | |
2377 | * chance last time (mostly it has become eligible now since we have probably | |
2378 | * yielded to lockholder in last iteration. This is done by toggling | |
2379 | * @dy_eligible each time a VCPU checked for eligibility.) | |
2380 | * | |
2381 | * Yielding to a recently pl-exited/cpu relax intercepted VCPU before yielding | |
2382 | * to preempted lock-holder could result in wrong VCPU selection and CPU | |
2383 | * burning. Giving priority for a potential lock-holder increases lock | |
2384 | * progress. | |
2385 | * | |
2386 | * Since algorithm is based on heuristics, accessing another VCPU data without | |
2387 | * locking does not harm. It may result in trying to yield to same VCPU, fail | |
2388 | * and continue with next VCPU and so on. | |
2389 | */ | |
7940876e | 2390 | static bool kvm_vcpu_eligible_for_directed_yield(struct kvm_vcpu *vcpu) |
06e48c51 | 2391 | { |
4a55dd72 | 2392 | #ifdef CONFIG_HAVE_KVM_CPU_RELAX_INTERCEPT |
06e48c51 R |
2393 | bool eligible; |
2394 | ||
2395 | eligible = !vcpu->spin_loop.in_spin_loop || | |
34656113 | 2396 | vcpu->spin_loop.dy_eligible; |
06e48c51 R |
2397 | |
2398 | if (vcpu->spin_loop.in_spin_loop) | |
2399 | kvm_vcpu_set_dy_eligible(vcpu, !vcpu->spin_loop.dy_eligible); | |
2400 | ||
2401 | return eligible; | |
4a55dd72 SW |
2402 | #else |
2403 | return true; | |
06e48c51 | 2404 | #endif |
4a55dd72 | 2405 | } |
c45c528e | 2406 | |
199b5763 | 2407 | void kvm_vcpu_on_spin(struct kvm_vcpu *me, bool yield_to_kernel_mode) |
d255f4f2 | 2408 | { |
217ece61 RR |
2409 | struct kvm *kvm = me->kvm; |
2410 | struct kvm_vcpu *vcpu; | |
2411 | int last_boosted_vcpu = me->kvm->last_boosted_vcpu; | |
2412 | int yielded = 0; | |
c45c528e | 2413 | int try = 3; |
217ece61 RR |
2414 | int pass; |
2415 | int i; | |
d255f4f2 | 2416 | |
4c088493 | 2417 | kvm_vcpu_set_in_spin_loop(me, true); |
217ece61 RR |
2418 | /* |
2419 | * We boost the priority of a VCPU that is runnable but not | |
2420 | * currently running, because it got preempted by something | |
2421 | * else and called schedule in __vcpu_run. Hopefully that | |
2422 | * VCPU is holding the lock that we need and will release it. | |
2423 | * We approximate round-robin by starting at the last boosted VCPU. | |
2424 | */ | |
c45c528e | 2425 | for (pass = 0; pass < 2 && !yielded && try; pass++) { |
217ece61 | 2426 | kvm_for_each_vcpu(i, vcpu, kvm) { |
5cfc2aab | 2427 | if (!pass && i <= last_boosted_vcpu) { |
217ece61 RR |
2428 | i = last_boosted_vcpu; |
2429 | continue; | |
2430 | } else if (pass && i > last_boosted_vcpu) | |
2431 | break; | |
6aa7de05 | 2432 | if (!READ_ONCE(vcpu->preempted)) |
7bc7ae25 | 2433 | continue; |
217ece61 RR |
2434 | if (vcpu == me) |
2435 | continue; | |
8577370f | 2436 | if (swait_active(&vcpu->wq) && !kvm_arch_vcpu_runnable(vcpu)) |
217ece61 | 2437 | continue; |
199b5763 LM |
2438 | if (yield_to_kernel_mode && !kvm_arch_vcpu_in_kernel(vcpu)) |
2439 | continue; | |
06e48c51 R |
2440 | if (!kvm_vcpu_eligible_for_directed_yield(vcpu)) |
2441 | continue; | |
c45c528e R |
2442 | |
2443 | yielded = kvm_vcpu_yield_to(vcpu); | |
2444 | if (yielded > 0) { | |
217ece61 | 2445 | kvm->last_boosted_vcpu = i; |
217ece61 | 2446 | break; |
c45c528e R |
2447 | } else if (yielded < 0) { |
2448 | try--; | |
2449 | if (!try) | |
2450 | break; | |
217ece61 | 2451 | } |
217ece61 RR |
2452 | } |
2453 | } | |
4c088493 | 2454 | kvm_vcpu_set_in_spin_loop(me, false); |
06e48c51 R |
2455 | |
2456 | /* Ensure vcpu is not eligible during next spinloop */ | |
2457 | kvm_vcpu_set_dy_eligible(me, false); | |
d255f4f2 ZE |
2458 | } |
2459 | EXPORT_SYMBOL_GPL(kvm_vcpu_on_spin); | |
2460 | ||
1499fa80 | 2461 | static vm_fault_t kvm_vcpu_fault(struct vm_fault *vmf) |
9a2bb7f4 | 2462 | { |
11bac800 | 2463 | struct kvm_vcpu *vcpu = vmf->vma->vm_file->private_data; |
9a2bb7f4 AK |
2464 | struct page *page; |
2465 | ||
e4a533a4 | 2466 | if (vmf->pgoff == 0) |
039576c0 | 2467 | page = virt_to_page(vcpu->run); |
09566765 | 2468 | #ifdef CONFIG_X86 |
e4a533a4 | 2469 | else if (vmf->pgoff == KVM_PIO_PAGE_OFFSET) |
ad312c7c | 2470 | page = virt_to_page(vcpu->arch.pio_data); |
5f94c174 | 2471 | #endif |
4b4357e0 | 2472 | #ifdef CONFIG_KVM_MMIO |
5f94c174 LV |
2473 | else if (vmf->pgoff == KVM_COALESCED_MMIO_PAGE_OFFSET) |
2474 | page = virt_to_page(vcpu->kvm->coalesced_mmio_ring); | |
09566765 | 2475 | #endif |
039576c0 | 2476 | else |
5b1c1493 | 2477 | return kvm_arch_vcpu_fault(vcpu, vmf); |
9a2bb7f4 | 2478 | get_page(page); |
e4a533a4 NP |
2479 | vmf->page = page; |
2480 | return 0; | |
9a2bb7f4 AK |
2481 | } |
2482 | ||
f0f37e2f | 2483 | static const struct vm_operations_struct kvm_vcpu_vm_ops = { |
e4a533a4 | 2484 | .fault = kvm_vcpu_fault, |
9a2bb7f4 AK |
2485 | }; |
2486 | ||
2487 | static int kvm_vcpu_mmap(struct file *file, struct vm_area_struct *vma) | |
2488 | { | |
2489 | vma->vm_ops = &kvm_vcpu_vm_ops; | |
2490 | return 0; | |
2491 | } | |
2492 | ||
bccf2150 AK |
2493 | static int kvm_vcpu_release(struct inode *inode, struct file *filp) |
2494 | { | |
2495 | struct kvm_vcpu *vcpu = filp->private_data; | |
2496 | ||
45b5939e | 2497 | debugfs_remove_recursive(vcpu->debugfs_dentry); |
66c0b394 | 2498 | kvm_put_kvm(vcpu->kvm); |
bccf2150 AK |
2499 | return 0; |
2500 | } | |
2501 | ||
3d3aab1b | 2502 | static struct file_operations kvm_vcpu_fops = { |
bccf2150 AK |
2503 | .release = kvm_vcpu_release, |
2504 | .unlocked_ioctl = kvm_vcpu_ioctl, | |
9a2bb7f4 | 2505 | .mmap = kvm_vcpu_mmap, |
6038f373 | 2506 | .llseek = noop_llseek, |
7ddfd3e0 | 2507 | KVM_COMPAT(kvm_vcpu_compat_ioctl), |
bccf2150 AK |
2508 | }; |
2509 | ||
2510 | /* | |
2511 | * Allocates an inode for the vcpu. | |
2512 | */ | |
2513 | static int create_vcpu_fd(struct kvm_vcpu *vcpu) | |
2514 | { | |
e46b4692 MY |
2515 | char name[8 + 1 + ITOA_MAX_LEN + 1]; |
2516 | ||
2517 | snprintf(name, sizeof(name), "kvm-vcpu:%d", vcpu->vcpu_id); | |
2518 | return anon_inode_getfd(name, &kvm_vcpu_fops, vcpu, O_RDWR | O_CLOEXEC); | |
bccf2150 AK |
2519 | } |
2520 | ||
45b5939e LC |
2521 | static int kvm_create_vcpu_debugfs(struct kvm_vcpu *vcpu) |
2522 | { | |
2523 | char dir_name[ITOA_MAX_LEN * 2]; | |
2524 | int ret; | |
2525 | ||
2526 | if (!kvm_arch_has_vcpu_debugfs()) | |
2527 | return 0; | |
2528 | ||
2529 | if (!debugfs_initialized()) | |
2530 | return 0; | |
2531 | ||
2532 | snprintf(dir_name, sizeof(dir_name), "vcpu%d", vcpu->vcpu_id); | |
2533 | vcpu->debugfs_dentry = debugfs_create_dir(dir_name, | |
2534 | vcpu->kvm->debugfs_dentry); | |
2535 | if (!vcpu->debugfs_dentry) | |
2536 | return -ENOMEM; | |
2537 | ||
2538 | ret = kvm_arch_create_vcpu_debugfs(vcpu); | |
2539 | if (ret < 0) { | |
2540 | debugfs_remove_recursive(vcpu->debugfs_dentry); | |
2541 | return ret; | |
2542 | } | |
2543 | ||
2544 | return 0; | |
2545 | } | |
2546 | ||
c5ea7660 AK |
2547 | /* |
2548 | * Creates some virtual cpus. Good luck creating more than one. | |
2549 | */ | |
73880c80 | 2550 | static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, u32 id) |
c5ea7660 AK |
2551 | { |
2552 | int r; | |
e09fefde | 2553 | struct kvm_vcpu *vcpu; |
c5ea7660 | 2554 | |
0b1b1dfd | 2555 | if (id >= KVM_MAX_VCPU_ID) |
338c7dba AH |
2556 | return -EINVAL; |
2557 | ||
6c7caebc PB |
2558 | mutex_lock(&kvm->lock); |
2559 | if (kvm->created_vcpus == KVM_MAX_VCPUS) { | |
2560 | mutex_unlock(&kvm->lock); | |
2561 | return -EINVAL; | |
2562 | } | |
2563 | ||
2564 | kvm->created_vcpus++; | |
2565 | mutex_unlock(&kvm->lock); | |
2566 | ||
73880c80 | 2567 | vcpu = kvm_arch_vcpu_create(kvm, id); |
6c7caebc PB |
2568 | if (IS_ERR(vcpu)) { |
2569 | r = PTR_ERR(vcpu); | |
2570 | goto vcpu_decrement; | |
2571 | } | |
c5ea7660 | 2572 | |
15ad7146 AK |
2573 | preempt_notifier_init(&vcpu->preempt_notifier, &kvm_preempt_ops); |
2574 | ||
26e5215f AK |
2575 | r = kvm_arch_vcpu_setup(vcpu); |
2576 | if (r) | |
d780592b | 2577 | goto vcpu_destroy; |
26e5215f | 2578 | |
45b5939e LC |
2579 | r = kvm_create_vcpu_debugfs(vcpu); |
2580 | if (r) | |
2581 | goto vcpu_destroy; | |
2582 | ||
11ec2804 | 2583 | mutex_lock(&kvm->lock); |
e09fefde DH |
2584 | if (kvm_get_vcpu_by_id(kvm, id)) { |
2585 | r = -EEXIST; | |
2586 | goto unlock_vcpu_destroy; | |
2587 | } | |
73880c80 GN |
2588 | |
2589 | BUG_ON(kvm->vcpus[atomic_read(&kvm->online_vcpus)]); | |
c5ea7660 | 2590 | |
fb3f0f51 | 2591 | /* Now it's all set up, let userspace reach it */ |
66c0b394 | 2592 | kvm_get_kvm(kvm); |
bccf2150 | 2593 | r = create_vcpu_fd(vcpu); |
73880c80 GN |
2594 | if (r < 0) { |
2595 | kvm_put_kvm(kvm); | |
d780592b | 2596 | goto unlock_vcpu_destroy; |
73880c80 GN |
2597 | } |
2598 | ||
2599 | kvm->vcpus[atomic_read(&kvm->online_vcpus)] = vcpu; | |
dd489240 PB |
2600 | |
2601 | /* | |
2602 | * Pairs with smp_rmb() in kvm_get_vcpu. Write kvm->vcpus | |
2603 | * before kvm->online_vcpu's incremented value. | |
2604 | */ | |
73880c80 GN |
2605 | smp_wmb(); |
2606 | atomic_inc(&kvm->online_vcpus); | |
2607 | ||
73880c80 | 2608 | mutex_unlock(&kvm->lock); |
42897d86 | 2609 | kvm_arch_vcpu_postcreate(vcpu); |
fb3f0f51 | 2610 | return r; |
39c3b86e | 2611 | |
d780592b | 2612 | unlock_vcpu_destroy: |
7d8fece6 | 2613 | mutex_unlock(&kvm->lock); |
45b5939e | 2614 | debugfs_remove_recursive(vcpu->debugfs_dentry); |
d780592b | 2615 | vcpu_destroy: |
d40ccc62 | 2616 | kvm_arch_vcpu_destroy(vcpu); |
6c7caebc PB |
2617 | vcpu_decrement: |
2618 | mutex_lock(&kvm->lock); | |
2619 | kvm->created_vcpus--; | |
2620 | mutex_unlock(&kvm->lock); | |
c5ea7660 AK |
2621 | return r; |
2622 | } | |
2623 | ||
1961d276 AK |
2624 | static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu *vcpu, sigset_t *sigset) |
2625 | { | |
2626 | if (sigset) { | |
2627 | sigdelsetmask(sigset, sigmask(SIGKILL)|sigmask(SIGSTOP)); | |
2628 | vcpu->sigset_active = 1; | |
2629 | vcpu->sigset = *sigset; | |
2630 | } else | |
2631 | vcpu->sigset_active = 0; | |
2632 | return 0; | |
2633 | } | |
2634 | ||
bccf2150 AK |
2635 | static long kvm_vcpu_ioctl(struct file *filp, |
2636 | unsigned int ioctl, unsigned long arg) | |
6aa8b732 | 2637 | { |
bccf2150 | 2638 | struct kvm_vcpu *vcpu = filp->private_data; |
2f366987 | 2639 | void __user *argp = (void __user *)arg; |
313a3dc7 | 2640 | int r; |
fa3795a7 DH |
2641 | struct kvm_fpu *fpu = NULL; |
2642 | struct kvm_sregs *kvm_sregs = NULL; | |
6aa8b732 | 2643 | |
6d4e4c4f AK |
2644 | if (vcpu->kvm->mm != current->mm) |
2645 | return -EIO; | |
2122ff5e | 2646 | |
2ea75be3 DM |
2647 | if (unlikely(_IOC_TYPE(ioctl) != KVMIO)) |
2648 | return -EINVAL; | |
2649 | ||
2122ff5e | 2650 | /* |
5cb0944c PB |
2651 | * Some architectures have vcpu ioctls that are asynchronous to vcpu |
2652 | * execution; mutex_lock() would break them. | |
2122ff5e | 2653 | */ |
5cb0944c PB |
2654 | r = kvm_arch_vcpu_async_ioctl(filp, ioctl, arg); |
2655 | if (r != -ENOIOCTLCMD) | |
9fc77441 | 2656 | return r; |
2122ff5e | 2657 | |
ec7660cc CD |
2658 | if (mutex_lock_killable(&vcpu->mutex)) |
2659 | return -EINTR; | |
6aa8b732 | 2660 | switch (ioctl) { |
0e4524a5 CB |
2661 | case KVM_RUN: { |
2662 | struct pid *oldpid; | |
f0fe5108 AK |
2663 | r = -EINVAL; |
2664 | if (arg) | |
2665 | goto out; | |
0e4524a5 | 2666 | oldpid = rcu_access_pointer(vcpu->pid); |
71dbc8a9 | 2667 | if (unlikely(oldpid != task_pid(current))) { |
7a72f7a1 | 2668 | /* The thread running this VCPU changed. */ |
bd2a6394 | 2669 | struct pid *newpid; |
f95ef0cd | 2670 | |
bd2a6394 CD |
2671 | r = kvm_arch_vcpu_run_pid_change(vcpu); |
2672 | if (r) | |
2673 | break; | |
2674 | ||
2675 | newpid = get_task_pid(current, PIDTYPE_PID); | |
7a72f7a1 CB |
2676 | rcu_assign_pointer(vcpu->pid, newpid); |
2677 | if (oldpid) | |
2678 | synchronize_rcu(); | |
2679 | put_pid(oldpid); | |
2680 | } | |
b6c7a5dc | 2681 | r = kvm_arch_vcpu_ioctl_run(vcpu, vcpu->run); |
64be5007 | 2682 | trace_kvm_userspace_exit(vcpu->run->exit_reason, r); |
6aa8b732 | 2683 | break; |
0e4524a5 | 2684 | } |
6aa8b732 | 2685 | case KVM_GET_REGS: { |
3e4bb3ac | 2686 | struct kvm_regs *kvm_regs; |
6aa8b732 | 2687 | |
3e4bb3ac | 2688 | r = -ENOMEM; |
b12ce36a | 2689 | kvm_regs = kzalloc(sizeof(struct kvm_regs), GFP_KERNEL_ACCOUNT); |
3e4bb3ac | 2690 | if (!kvm_regs) |
6aa8b732 | 2691 | goto out; |
3e4bb3ac XZ |
2692 | r = kvm_arch_vcpu_ioctl_get_regs(vcpu, kvm_regs); |
2693 | if (r) | |
2694 | goto out_free1; | |
6aa8b732 | 2695 | r = -EFAULT; |
3e4bb3ac XZ |
2696 | if (copy_to_user(argp, kvm_regs, sizeof(struct kvm_regs))) |
2697 | goto out_free1; | |
6aa8b732 | 2698 | r = 0; |
3e4bb3ac XZ |
2699 | out_free1: |
2700 | kfree(kvm_regs); | |
6aa8b732 AK |
2701 | break; |
2702 | } | |
2703 | case KVM_SET_REGS: { | |
3e4bb3ac | 2704 | struct kvm_regs *kvm_regs; |
6aa8b732 | 2705 | |
3e4bb3ac | 2706 | r = -ENOMEM; |
ff5c2c03 SL |
2707 | kvm_regs = memdup_user(argp, sizeof(*kvm_regs)); |
2708 | if (IS_ERR(kvm_regs)) { | |
2709 | r = PTR_ERR(kvm_regs); | |
6aa8b732 | 2710 | goto out; |
ff5c2c03 | 2711 | } |
3e4bb3ac | 2712 | r = kvm_arch_vcpu_ioctl_set_regs(vcpu, kvm_regs); |
3e4bb3ac | 2713 | kfree(kvm_regs); |
6aa8b732 AK |
2714 | break; |
2715 | } | |
2716 | case KVM_GET_SREGS: { | |
b12ce36a BG |
2717 | kvm_sregs = kzalloc(sizeof(struct kvm_sregs), |
2718 | GFP_KERNEL_ACCOUNT); | |
fa3795a7 DH |
2719 | r = -ENOMEM; |
2720 | if (!kvm_sregs) | |
2721 | goto out; | |
2722 | r = kvm_arch_vcpu_ioctl_get_sregs(vcpu, kvm_sregs); | |
6aa8b732 AK |
2723 | if (r) |
2724 | goto out; | |
2725 | r = -EFAULT; | |
fa3795a7 | 2726 | if (copy_to_user(argp, kvm_sregs, sizeof(struct kvm_sregs))) |
6aa8b732 AK |
2727 | goto out; |
2728 | r = 0; | |
2729 | break; | |
2730 | } | |
2731 | case KVM_SET_SREGS: { | |
ff5c2c03 SL |
2732 | kvm_sregs = memdup_user(argp, sizeof(*kvm_sregs)); |
2733 | if (IS_ERR(kvm_sregs)) { | |
2734 | r = PTR_ERR(kvm_sregs); | |
18595411 | 2735 | kvm_sregs = NULL; |
6aa8b732 | 2736 | goto out; |
ff5c2c03 | 2737 | } |
fa3795a7 | 2738 | r = kvm_arch_vcpu_ioctl_set_sregs(vcpu, kvm_sregs); |
6aa8b732 AK |
2739 | break; |
2740 | } | |
62d9f0db MT |
2741 | case KVM_GET_MP_STATE: { |
2742 | struct kvm_mp_state mp_state; | |
2743 | ||
2744 | r = kvm_arch_vcpu_ioctl_get_mpstate(vcpu, &mp_state); | |
2745 | if (r) | |
2746 | goto out; | |
2747 | r = -EFAULT; | |
893bdbf1 | 2748 | if (copy_to_user(argp, &mp_state, sizeof(mp_state))) |
62d9f0db MT |
2749 | goto out; |
2750 | r = 0; | |
2751 | break; | |
2752 | } | |
2753 | case KVM_SET_MP_STATE: { | |
2754 | struct kvm_mp_state mp_state; | |
2755 | ||
2756 | r = -EFAULT; | |
893bdbf1 | 2757 | if (copy_from_user(&mp_state, argp, sizeof(mp_state))) |
62d9f0db MT |
2758 | goto out; |
2759 | r = kvm_arch_vcpu_ioctl_set_mpstate(vcpu, &mp_state); | |
62d9f0db MT |
2760 | break; |
2761 | } | |
6aa8b732 AK |
2762 | case KVM_TRANSLATE: { |
2763 | struct kvm_translation tr; | |
2764 | ||
2765 | r = -EFAULT; | |
893bdbf1 | 2766 | if (copy_from_user(&tr, argp, sizeof(tr))) |
6aa8b732 | 2767 | goto out; |
8b006791 | 2768 | r = kvm_arch_vcpu_ioctl_translate(vcpu, &tr); |
6aa8b732 AK |
2769 | if (r) |
2770 | goto out; | |
2771 | r = -EFAULT; | |
893bdbf1 | 2772 | if (copy_to_user(argp, &tr, sizeof(tr))) |
6aa8b732 AK |
2773 | goto out; |
2774 | r = 0; | |
2775 | break; | |
2776 | } | |
d0bfb940 JK |
2777 | case KVM_SET_GUEST_DEBUG: { |
2778 | struct kvm_guest_debug dbg; | |
6aa8b732 AK |
2779 | |
2780 | r = -EFAULT; | |
893bdbf1 | 2781 | if (copy_from_user(&dbg, argp, sizeof(dbg))) |
6aa8b732 | 2782 | goto out; |
d0bfb940 | 2783 | r = kvm_arch_vcpu_ioctl_set_guest_debug(vcpu, &dbg); |
6aa8b732 AK |
2784 | break; |
2785 | } | |
1961d276 AK |
2786 | case KVM_SET_SIGNAL_MASK: { |
2787 | struct kvm_signal_mask __user *sigmask_arg = argp; | |
2788 | struct kvm_signal_mask kvm_sigmask; | |
2789 | sigset_t sigset, *p; | |
2790 | ||
2791 | p = NULL; | |
2792 | if (argp) { | |
2793 | r = -EFAULT; | |
2794 | if (copy_from_user(&kvm_sigmask, argp, | |
893bdbf1 | 2795 | sizeof(kvm_sigmask))) |
1961d276 AK |
2796 | goto out; |
2797 | r = -EINVAL; | |
893bdbf1 | 2798 | if (kvm_sigmask.len != sizeof(sigset)) |
1961d276 AK |
2799 | goto out; |
2800 | r = -EFAULT; | |
2801 | if (copy_from_user(&sigset, sigmask_arg->sigset, | |
893bdbf1 | 2802 | sizeof(sigset))) |
1961d276 AK |
2803 | goto out; |
2804 | p = &sigset; | |
2805 | } | |
376d41ff | 2806 | r = kvm_vcpu_ioctl_set_sigmask(vcpu, p); |
1961d276 AK |
2807 | break; |
2808 | } | |
b8836737 | 2809 | case KVM_GET_FPU: { |
b12ce36a | 2810 | fpu = kzalloc(sizeof(struct kvm_fpu), GFP_KERNEL_ACCOUNT); |
fa3795a7 DH |
2811 | r = -ENOMEM; |
2812 | if (!fpu) | |
2813 | goto out; | |
2814 | r = kvm_arch_vcpu_ioctl_get_fpu(vcpu, fpu); | |
b8836737 AK |
2815 | if (r) |
2816 | goto out; | |
2817 | r = -EFAULT; | |
fa3795a7 | 2818 | if (copy_to_user(argp, fpu, sizeof(struct kvm_fpu))) |
b8836737 AK |
2819 | goto out; |
2820 | r = 0; | |
2821 | break; | |
2822 | } | |
2823 | case KVM_SET_FPU: { | |
ff5c2c03 SL |
2824 | fpu = memdup_user(argp, sizeof(*fpu)); |
2825 | if (IS_ERR(fpu)) { | |
2826 | r = PTR_ERR(fpu); | |
18595411 | 2827 | fpu = NULL; |
b8836737 | 2828 | goto out; |
ff5c2c03 | 2829 | } |
fa3795a7 | 2830 | r = kvm_arch_vcpu_ioctl_set_fpu(vcpu, fpu); |
b8836737 AK |
2831 | break; |
2832 | } | |
bccf2150 | 2833 | default: |
313a3dc7 | 2834 | r = kvm_arch_vcpu_ioctl(filp, ioctl, arg); |
bccf2150 AK |
2835 | } |
2836 | out: | |
ec7660cc | 2837 | mutex_unlock(&vcpu->mutex); |
fa3795a7 DH |
2838 | kfree(fpu); |
2839 | kfree(kvm_sregs); | |
bccf2150 AK |
2840 | return r; |
2841 | } | |
2842 | ||
de8e5d74 | 2843 | #ifdef CONFIG_KVM_COMPAT |
1dda606c AG |
2844 | static long kvm_vcpu_compat_ioctl(struct file *filp, |
2845 | unsigned int ioctl, unsigned long arg) | |
2846 | { | |
2847 | struct kvm_vcpu *vcpu = filp->private_data; | |
2848 | void __user *argp = compat_ptr(arg); | |
2849 | int r; | |
2850 | ||
2851 | if (vcpu->kvm->mm != current->mm) | |
2852 | return -EIO; | |
2853 | ||
2854 | switch (ioctl) { | |
2855 | case KVM_SET_SIGNAL_MASK: { | |
2856 | struct kvm_signal_mask __user *sigmask_arg = argp; | |
2857 | struct kvm_signal_mask kvm_sigmask; | |
1dda606c AG |
2858 | sigset_t sigset; |
2859 | ||
2860 | if (argp) { | |
2861 | r = -EFAULT; | |
2862 | if (copy_from_user(&kvm_sigmask, argp, | |
893bdbf1 | 2863 | sizeof(kvm_sigmask))) |
1dda606c AG |
2864 | goto out; |
2865 | r = -EINVAL; | |
3968cf62 | 2866 | if (kvm_sigmask.len != sizeof(compat_sigset_t)) |
1dda606c AG |
2867 | goto out; |
2868 | r = -EFAULT; | |
3968cf62 | 2869 | if (get_compat_sigset(&sigset, (void *)sigmask_arg->sigset)) |
1dda606c | 2870 | goto out; |
760a9a30 AC |
2871 | r = kvm_vcpu_ioctl_set_sigmask(vcpu, &sigset); |
2872 | } else | |
2873 | r = kvm_vcpu_ioctl_set_sigmask(vcpu, NULL); | |
1dda606c AG |
2874 | break; |
2875 | } | |
2876 | default: | |
2877 | r = kvm_vcpu_ioctl(filp, ioctl, arg); | |
2878 | } | |
2879 | ||
2880 | out: | |
2881 | return r; | |
2882 | } | |
2883 | #endif | |
2884 | ||
852b6d57 SW |
2885 | static int kvm_device_ioctl_attr(struct kvm_device *dev, |
2886 | int (*accessor)(struct kvm_device *dev, | |
2887 | struct kvm_device_attr *attr), | |
2888 | unsigned long arg) | |
2889 | { | |
2890 | struct kvm_device_attr attr; | |
2891 | ||
2892 | if (!accessor) | |
2893 | return -EPERM; | |
2894 | ||
2895 | if (copy_from_user(&attr, (void __user *)arg, sizeof(attr))) | |
2896 | return -EFAULT; | |
2897 | ||
2898 | return accessor(dev, &attr); | |
2899 | } | |
2900 | ||
2901 | static long kvm_device_ioctl(struct file *filp, unsigned int ioctl, | |
2902 | unsigned long arg) | |
2903 | { | |
2904 | struct kvm_device *dev = filp->private_data; | |
2905 | ||
2906 | switch (ioctl) { | |
2907 | case KVM_SET_DEVICE_ATTR: | |
2908 | return kvm_device_ioctl_attr(dev, dev->ops->set_attr, arg); | |
2909 | case KVM_GET_DEVICE_ATTR: | |
2910 | return kvm_device_ioctl_attr(dev, dev->ops->get_attr, arg); | |
2911 | case KVM_HAS_DEVICE_ATTR: | |
2912 | return kvm_device_ioctl_attr(dev, dev->ops->has_attr, arg); | |
2913 | default: | |
2914 | if (dev->ops->ioctl) | |
2915 | return dev->ops->ioctl(dev, ioctl, arg); | |
2916 | ||
2917 | return -ENOTTY; | |
2918 | } | |
2919 | } | |
2920 | ||
852b6d57 SW |
2921 | static int kvm_device_release(struct inode *inode, struct file *filp) |
2922 | { | |
2923 | struct kvm_device *dev = filp->private_data; | |
2924 | struct kvm *kvm = dev->kvm; | |
2925 | ||
852b6d57 SW |
2926 | kvm_put_kvm(kvm); |
2927 | return 0; | |
2928 | } | |
2929 | ||
2930 | static const struct file_operations kvm_device_fops = { | |
2931 | .unlocked_ioctl = kvm_device_ioctl, | |
2932 | .release = kvm_device_release, | |
7ddfd3e0 | 2933 | KVM_COMPAT(kvm_device_ioctl), |
852b6d57 SW |
2934 | }; |
2935 | ||
2936 | struct kvm_device *kvm_device_from_filp(struct file *filp) | |
2937 | { | |
2938 | if (filp->f_op != &kvm_device_fops) | |
2939 | return NULL; | |
2940 | ||
2941 | return filp->private_data; | |
2942 | } | |
2943 | ||
d60eacb0 | 2944 | static struct kvm_device_ops *kvm_device_ops_table[KVM_DEV_TYPE_MAX] = { |
5df554ad | 2945 | #ifdef CONFIG_KVM_MPIC |
d60eacb0 WD |
2946 | [KVM_DEV_TYPE_FSL_MPIC_20] = &kvm_mpic_ops, |
2947 | [KVM_DEV_TYPE_FSL_MPIC_42] = &kvm_mpic_ops, | |
5975a2e0 | 2948 | #endif |
d60eacb0 WD |
2949 | }; |
2950 | ||
2951 | int kvm_register_device_ops(struct kvm_device_ops *ops, u32 type) | |
2952 | { | |
2953 | if (type >= ARRAY_SIZE(kvm_device_ops_table)) | |
2954 | return -ENOSPC; | |
2955 | ||
2956 | if (kvm_device_ops_table[type] != NULL) | |
2957 | return -EEXIST; | |
2958 | ||
2959 | kvm_device_ops_table[type] = ops; | |
2960 | return 0; | |
2961 | } | |
2962 | ||
571ee1b6 WL |
2963 | void kvm_unregister_device_ops(u32 type) |
2964 | { | |
2965 | if (kvm_device_ops_table[type] != NULL) | |
2966 | kvm_device_ops_table[type] = NULL; | |
2967 | } | |
2968 | ||
852b6d57 SW |
2969 | static int kvm_ioctl_create_device(struct kvm *kvm, |
2970 | struct kvm_create_device *cd) | |
2971 | { | |
2972 | struct kvm_device_ops *ops = NULL; | |
2973 | struct kvm_device *dev; | |
2974 | bool test = cd->flags & KVM_CREATE_DEVICE_TEST; | |
2975 | int ret; | |
2976 | ||
d60eacb0 WD |
2977 | if (cd->type >= ARRAY_SIZE(kvm_device_ops_table)) |
2978 | return -ENODEV; | |
2979 | ||
2980 | ops = kvm_device_ops_table[cd->type]; | |
2981 | if (ops == NULL) | |
852b6d57 | 2982 | return -ENODEV; |
852b6d57 SW |
2983 | |
2984 | if (test) | |
2985 | return 0; | |
2986 | ||
b12ce36a | 2987 | dev = kzalloc(sizeof(*dev), GFP_KERNEL_ACCOUNT); |
852b6d57 SW |
2988 | if (!dev) |
2989 | return -ENOMEM; | |
2990 | ||
2991 | dev->ops = ops; | |
2992 | dev->kvm = kvm; | |
852b6d57 | 2993 | |
a28ebea2 | 2994 | mutex_lock(&kvm->lock); |
852b6d57 SW |
2995 | ret = ops->create(dev, cd->type); |
2996 | if (ret < 0) { | |
a28ebea2 | 2997 | mutex_unlock(&kvm->lock); |
852b6d57 SW |
2998 | kfree(dev); |
2999 | return ret; | |
3000 | } | |
a28ebea2 CD |
3001 | list_add(&dev->vm_node, &kvm->devices); |
3002 | mutex_unlock(&kvm->lock); | |
852b6d57 | 3003 | |
023e9fdd CD |
3004 | if (ops->init) |
3005 | ops->init(dev); | |
3006 | ||
cfa39381 | 3007 | kvm_get_kvm(kvm); |
24009b05 | 3008 | ret = anon_inode_getfd(ops->name, &kvm_device_fops, dev, O_RDWR | O_CLOEXEC); |
852b6d57 | 3009 | if (ret < 0) { |
cfa39381 | 3010 | kvm_put_kvm(kvm); |
a28ebea2 CD |
3011 | mutex_lock(&kvm->lock); |
3012 | list_del(&dev->vm_node); | |
3013 | mutex_unlock(&kvm->lock); | |
a0f1d21c | 3014 | ops->destroy(dev); |
852b6d57 SW |
3015 | return ret; |
3016 | } | |
3017 | ||
852b6d57 SW |
3018 | cd->fd = ret; |
3019 | return 0; | |
3020 | } | |
3021 | ||
92b591a4 AG |
3022 | static long kvm_vm_ioctl_check_extension_generic(struct kvm *kvm, long arg) |
3023 | { | |
3024 | switch (arg) { | |
3025 | case KVM_CAP_USER_MEMORY: | |
3026 | case KVM_CAP_DESTROY_MEMORY_REGION_WORKS: | |
3027 | case KVM_CAP_JOIN_MEMORY_REGIONS_WORKS: | |
92b591a4 AG |
3028 | case KVM_CAP_INTERNAL_ERROR_DATA: |
3029 | #ifdef CONFIG_HAVE_KVM_MSI | |
3030 | case KVM_CAP_SIGNAL_MSI: | |
3031 | #endif | |
297e2105 | 3032 | #ifdef CONFIG_HAVE_KVM_IRQFD |
dc9be0fa | 3033 | case KVM_CAP_IRQFD: |
92b591a4 AG |
3034 | case KVM_CAP_IRQFD_RESAMPLE: |
3035 | #endif | |
e9ea5069 | 3036 | case KVM_CAP_IOEVENTFD_ANY_LENGTH: |
92b591a4 | 3037 | case KVM_CAP_CHECK_EXTENSION_VM: |
e5d83c74 | 3038 | case KVM_CAP_ENABLE_CAP_VM: |
2a31b9db PB |
3039 | #ifdef CONFIG_KVM_GENERIC_DIRTYLOG_READ_PROTECT |
3040 | case KVM_CAP_MANUAL_DIRTY_LOG_PROTECT: | |
3041 | #endif | |
92b591a4 | 3042 | return 1; |
4b4357e0 | 3043 | #ifdef CONFIG_KVM_MMIO |
30422558 PB |
3044 | case KVM_CAP_COALESCED_MMIO: |
3045 | return KVM_COALESCED_MMIO_PAGE_OFFSET; | |
0804c849 PH |
3046 | case KVM_CAP_COALESCED_PIO: |
3047 | return 1; | |
30422558 | 3048 | #endif |
92b591a4 AG |
3049 | #ifdef CONFIG_HAVE_KVM_IRQ_ROUTING |
3050 | case KVM_CAP_IRQ_ROUTING: | |
3051 | return KVM_MAX_IRQ_ROUTES; | |
f481b069 PB |
3052 | #endif |
3053 | #if KVM_ADDRESS_SPACE_NUM > 1 | |
3054 | case KVM_CAP_MULTI_ADDRESS_SPACE: | |
3055 | return KVM_ADDRESS_SPACE_NUM; | |
92b591a4 | 3056 | #endif |
0b1b1dfd GK |
3057 | case KVM_CAP_MAX_VCPU_ID: |
3058 | return KVM_MAX_VCPU_ID; | |
92b591a4 AG |
3059 | default: |
3060 | break; | |
3061 | } | |
3062 | return kvm_vm_ioctl_check_extension(kvm, arg); | |
3063 | } | |
3064 | ||
e5d83c74 PB |
3065 | int __attribute__((weak)) kvm_vm_ioctl_enable_cap(struct kvm *kvm, |
3066 | struct kvm_enable_cap *cap) | |
3067 | { | |
3068 | return -EINVAL; | |
3069 | } | |
3070 | ||
3071 | static int kvm_vm_ioctl_enable_cap_generic(struct kvm *kvm, | |
3072 | struct kvm_enable_cap *cap) | |
3073 | { | |
3074 | switch (cap->cap) { | |
2a31b9db PB |
3075 | #ifdef CONFIG_KVM_GENERIC_DIRTYLOG_READ_PROTECT |
3076 | case KVM_CAP_MANUAL_DIRTY_LOG_PROTECT: | |
3077 | if (cap->flags || (cap->args[0] & ~1)) | |
3078 | return -EINVAL; | |
3079 | kvm->manual_dirty_log_protect = cap->args[0]; | |
3080 | return 0; | |
3081 | #endif | |
e5d83c74 PB |
3082 | default: |
3083 | return kvm_vm_ioctl_enable_cap(kvm, cap); | |
3084 | } | |
3085 | } | |
3086 | ||
bccf2150 AK |
3087 | static long kvm_vm_ioctl(struct file *filp, |
3088 | unsigned int ioctl, unsigned long arg) | |
3089 | { | |
3090 | struct kvm *kvm = filp->private_data; | |
3091 | void __user *argp = (void __user *)arg; | |
1fe779f8 | 3092 | int r; |
bccf2150 | 3093 | |
6d4e4c4f AK |
3094 | if (kvm->mm != current->mm) |
3095 | return -EIO; | |
bccf2150 AK |
3096 | switch (ioctl) { |
3097 | case KVM_CREATE_VCPU: | |
3098 | r = kvm_vm_ioctl_create_vcpu(kvm, arg); | |
bccf2150 | 3099 | break; |
e5d83c74 PB |
3100 | case KVM_ENABLE_CAP: { |
3101 | struct kvm_enable_cap cap; | |
3102 | ||
3103 | r = -EFAULT; | |
3104 | if (copy_from_user(&cap, argp, sizeof(cap))) | |
3105 | goto out; | |
3106 | r = kvm_vm_ioctl_enable_cap_generic(kvm, &cap); | |
3107 | break; | |
3108 | } | |
6fc138d2 IE |
3109 | case KVM_SET_USER_MEMORY_REGION: { |
3110 | struct kvm_userspace_memory_region kvm_userspace_mem; | |
3111 | ||
3112 | r = -EFAULT; | |
3113 | if (copy_from_user(&kvm_userspace_mem, argp, | |
893bdbf1 | 3114 | sizeof(kvm_userspace_mem))) |
6fc138d2 IE |
3115 | goto out; |
3116 | ||
47ae31e2 | 3117 | r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_userspace_mem); |
6aa8b732 AK |
3118 | break; |
3119 | } | |
3120 | case KVM_GET_DIRTY_LOG: { | |
3121 | struct kvm_dirty_log log; | |
3122 | ||
3123 | r = -EFAULT; | |
893bdbf1 | 3124 | if (copy_from_user(&log, argp, sizeof(log))) |
6aa8b732 | 3125 | goto out; |
2c6f5df9 | 3126 | r = kvm_vm_ioctl_get_dirty_log(kvm, &log); |
6aa8b732 AK |
3127 | break; |
3128 | } | |
2a31b9db PB |
3129 | #ifdef CONFIG_KVM_GENERIC_DIRTYLOG_READ_PROTECT |
3130 | case KVM_CLEAR_DIRTY_LOG: { | |
3131 | struct kvm_clear_dirty_log log; | |
3132 | ||
3133 | r = -EFAULT; | |
3134 | if (copy_from_user(&log, argp, sizeof(log))) | |
3135 | goto out; | |
3136 | r = kvm_vm_ioctl_clear_dirty_log(kvm, &log); | |
3137 | break; | |
3138 | } | |
3139 | #endif | |
4b4357e0 | 3140 | #ifdef CONFIG_KVM_MMIO |
5f94c174 LV |
3141 | case KVM_REGISTER_COALESCED_MMIO: { |
3142 | struct kvm_coalesced_mmio_zone zone; | |
f95ef0cd | 3143 | |
5f94c174 | 3144 | r = -EFAULT; |
893bdbf1 | 3145 | if (copy_from_user(&zone, argp, sizeof(zone))) |
5f94c174 | 3146 | goto out; |
5f94c174 | 3147 | r = kvm_vm_ioctl_register_coalesced_mmio(kvm, &zone); |
5f94c174 LV |
3148 | break; |
3149 | } | |
3150 | case KVM_UNREGISTER_COALESCED_MMIO: { | |
3151 | struct kvm_coalesced_mmio_zone zone; | |
f95ef0cd | 3152 | |
5f94c174 | 3153 | r = -EFAULT; |
893bdbf1 | 3154 | if (copy_from_user(&zone, argp, sizeof(zone))) |
5f94c174 | 3155 | goto out; |
5f94c174 | 3156 | r = kvm_vm_ioctl_unregister_coalesced_mmio(kvm, &zone); |
5f94c174 LV |
3157 | break; |
3158 | } | |
3159 | #endif | |
721eecbf GH |
3160 | case KVM_IRQFD: { |
3161 | struct kvm_irqfd data; | |
3162 | ||
3163 | r = -EFAULT; | |
893bdbf1 | 3164 | if (copy_from_user(&data, argp, sizeof(data))) |
721eecbf | 3165 | goto out; |
d4db2935 | 3166 | r = kvm_irqfd(kvm, &data); |
721eecbf GH |
3167 | break; |
3168 | } | |
d34e6b17 GH |
3169 | case KVM_IOEVENTFD: { |
3170 | struct kvm_ioeventfd data; | |
3171 | ||
3172 | r = -EFAULT; | |
893bdbf1 | 3173 | if (copy_from_user(&data, argp, sizeof(data))) |
d34e6b17 GH |
3174 | goto out; |
3175 | r = kvm_ioeventfd(kvm, &data); | |
3176 | break; | |
3177 | } | |
07975ad3 JK |
3178 | #ifdef CONFIG_HAVE_KVM_MSI |
3179 | case KVM_SIGNAL_MSI: { | |
3180 | struct kvm_msi msi; | |
3181 | ||
3182 | r = -EFAULT; | |
893bdbf1 | 3183 | if (copy_from_user(&msi, argp, sizeof(msi))) |
07975ad3 JK |
3184 | goto out; |
3185 | r = kvm_send_userspace_msi(kvm, &msi); | |
3186 | break; | |
3187 | } | |
23d43cf9 CD |
3188 | #endif |
3189 | #ifdef __KVM_HAVE_IRQ_LINE | |
3190 | case KVM_IRQ_LINE_STATUS: | |
3191 | case KVM_IRQ_LINE: { | |
3192 | struct kvm_irq_level irq_event; | |
3193 | ||
3194 | r = -EFAULT; | |
893bdbf1 | 3195 | if (copy_from_user(&irq_event, argp, sizeof(irq_event))) |
23d43cf9 CD |
3196 | goto out; |
3197 | ||
aa2fbe6d YZ |
3198 | r = kvm_vm_ioctl_irq_line(kvm, &irq_event, |
3199 | ioctl == KVM_IRQ_LINE_STATUS); | |
23d43cf9 CD |
3200 | if (r) |
3201 | goto out; | |
3202 | ||
3203 | r = -EFAULT; | |
3204 | if (ioctl == KVM_IRQ_LINE_STATUS) { | |
893bdbf1 | 3205 | if (copy_to_user(argp, &irq_event, sizeof(irq_event))) |
23d43cf9 CD |
3206 | goto out; |
3207 | } | |
3208 | ||
3209 | r = 0; | |
3210 | break; | |
3211 | } | |
73880c80 | 3212 | #endif |
aa8d5944 AG |
3213 | #ifdef CONFIG_HAVE_KVM_IRQ_ROUTING |
3214 | case KVM_SET_GSI_ROUTING: { | |
3215 | struct kvm_irq_routing routing; | |
3216 | struct kvm_irq_routing __user *urouting; | |
f8c1b85b | 3217 | struct kvm_irq_routing_entry *entries = NULL; |
aa8d5944 AG |
3218 | |
3219 | r = -EFAULT; | |
3220 | if (copy_from_user(&routing, argp, sizeof(routing))) | |
3221 | goto out; | |
3222 | r = -EINVAL; | |
5c0aea0e DH |
3223 | if (!kvm_arch_can_set_irq_routing(kvm)) |
3224 | goto out; | |
caf1ff26 | 3225 | if (routing.nr > KVM_MAX_IRQ_ROUTES) |
aa8d5944 AG |
3226 | goto out; |
3227 | if (routing.flags) | |
3228 | goto out; | |
f8c1b85b PB |
3229 | if (routing.nr) { |
3230 | r = -ENOMEM; | |
42bc47b3 KC |
3231 | entries = vmalloc(array_size(sizeof(*entries), |
3232 | routing.nr)); | |
f8c1b85b PB |
3233 | if (!entries) |
3234 | goto out; | |
3235 | r = -EFAULT; | |
3236 | urouting = argp; | |
3237 | if (copy_from_user(entries, urouting->entries, | |
3238 | routing.nr * sizeof(*entries))) | |
3239 | goto out_free_irq_routing; | |
3240 | } | |
aa8d5944 AG |
3241 | r = kvm_set_irq_routing(kvm, entries, routing.nr, |
3242 | routing.flags); | |
a642a175 | 3243 | out_free_irq_routing: |
aa8d5944 AG |
3244 | vfree(entries); |
3245 | break; | |
3246 | } | |
3247 | #endif /* CONFIG_HAVE_KVM_IRQ_ROUTING */ | |
852b6d57 SW |
3248 | case KVM_CREATE_DEVICE: { |
3249 | struct kvm_create_device cd; | |
3250 | ||
3251 | r = -EFAULT; | |
3252 | if (copy_from_user(&cd, argp, sizeof(cd))) | |
3253 | goto out; | |
3254 | ||
3255 | r = kvm_ioctl_create_device(kvm, &cd); | |
3256 | if (r) | |
3257 | goto out; | |
3258 | ||
3259 | r = -EFAULT; | |
3260 | if (copy_to_user(argp, &cd, sizeof(cd))) | |
3261 | goto out; | |
3262 | ||
3263 | r = 0; | |
3264 | break; | |
3265 | } | |
92b591a4 AG |
3266 | case KVM_CHECK_EXTENSION: |
3267 | r = kvm_vm_ioctl_check_extension_generic(kvm, arg); | |
3268 | break; | |
f17abe9a | 3269 | default: |
1fe779f8 | 3270 | r = kvm_arch_vm_ioctl(filp, ioctl, arg); |
f17abe9a AK |
3271 | } |
3272 | out: | |
3273 | return r; | |
3274 | } | |
3275 | ||
de8e5d74 | 3276 | #ifdef CONFIG_KVM_COMPAT |
6ff5894c AB |
3277 | struct compat_kvm_dirty_log { |
3278 | __u32 slot; | |
3279 | __u32 padding1; | |
3280 | union { | |
3281 | compat_uptr_t dirty_bitmap; /* one bit per page */ | |
3282 | __u64 padding2; | |
3283 | }; | |
3284 | }; | |
3285 | ||
3286 | static long kvm_vm_compat_ioctl(struct file *filp, | |
3287 | unsigned int ioctl, unsigned long arg) | |
3288 | { | |
3289 | struct kvm *kvm = filp->private_data; | |
3290 | int r; | |
3291 | ||
3292 | if (kvm->mm != current->mm) | |
3293 | return -EIO; | |
3294 | switch (ioctl) { | |
3295 | case KVM_GET_DIRTY_LOG: { | |
3296 | struct compat_kvm_dirty_log compat_log; | |
3297 | struct kvm_dirty_log log; | |
3298 | ||
6ff5894c AB |
3299 | if (copy_from_user(&compat_log, (void __user *)arg, |
3300 | sizeof(compat_log))) | |
f6a3b168 | 3301 | return -EFAULT; |
6ff5894c AB |
3302 | log.slot = compat_log.slot; |
3303 | log.padding1 = compat_log.padding1; | |
3304 | log.padding2 = compat_log.padding2; | |
3305 | log.dirty_bitmap = compat_ptr(compat_log.dirty_bitmap); | |
3306 | ||
3307 | r = kvm_vm_ioctl_get_dirty_log(kvm, &log); | |
6ff5894c AB |
3308 | break; |
3309 | } | |
3310 | default: | |
3311 | r = kvm_vm_ioctl(filp, ioctl, arg); | |
3312 | } | |
6ff5894c AB |
3313 | return r; |
3314 | } | |
3315 | #endif | |
3316 | ||
3d3aab1b | 3317 | static struct file_operations kvm_vm_fops = { |
f17abe9a AK |
3318 | .release = kvm_vm_release, |
3319 | .unlocked_ioctl = kvm_vm_ioctl, | |
6038f373 | 3320 | .llseek = noop_llseek, |
7ddfd3e0 | 3321 | KVM_COMPAT(kvm_vm_compat_ioctl), |
f17abe9a AK |
3322 | }; |
3323 | ||
e08b9637 | 3324 | static int kvm_dev_ioctl_create_vm(unsigned long type) |
f17abe9a | 3325 | { |
aac87636 | 3326 | int r; |
f17abe9a | 3327 | struct kvm *kvm; |
506cfba9 | 3328 | struct file *file; |
f17abe9a | 3329 | |
e08b9637 | 3330 | kvm = kvm_create_vm(type); |
d6d28168 AK |
3331 | if (IS_ERR(kvm)) |
3332 | return PTR_ERR(kvm); | |
4b4357e0 | 3333 | #ifdef CONFIG_KVM_MMIO |
6ce5a090 | 3334 | r = kvm_coalesced_mmio_init(kvm); |
78588335 ME |
3335 | if (r < 0) |
3336 | goto put_kvm; | |
6ce5a090 | 3337 | #endif |
506cfba9 | 3338 | r = get_unused_fd_flags(O_CLOEXEC); |
78588335 ME |
3339 | if (r < 0) |
3340 | goto put_kvm; | |
3341 | ||
506cfba9 AV |
3342 | file = anon_inode_getfile("kvm-vm", &kvm_vm_fops, kvm, O_RDWR); |
3343 | if (IS_ERR(file)) { | |
3344 | put_unused_fd(r); | |
78588335 ME |
3345 | r = PTR_ERR(file); |
3346 | goto put_kvm; | |
506cfba9 | 3347 | } |
536a6f88 | 3348 | |
525df861 PB |
3349 | /* |
3350 | * Don't call kvm_put_kvm anymore at this point; file->f_op is | |
3351 | * already set, with ->release() being kvm_vm_release(). In error | |
3352 | * cases it will be called by the final fput(file) and will take | |
3353 | * care of doing kvm_put_kvm(kvm). | |
3354 | */ | |
536a6f88 | 3355 | if (kvm_create_vm_debugfs(kvm, r) < 0) { |
506cfba9 AV |
3356 | put_unused_fd(r); |
3357 | fput(file); | |
536a6f88 JF |
3358 | return -ENOMEM; |
3359 | } | |
286de8f6 | 3360 | kvm_uevent_notify_change(KVM_EVENT_CREATE_VM, kvm); |
f17abe9a | 3361 | |
506cfba9 | 3362 | fd_install(r, file); |
aac87636 | 3363 | return r; |
78588335 ME |
3364 | |
3365 | put_kvm: | |
3366 | kvm_put_kvm(kvm); | |
3367 | return r; | |
f17abe9a AK |
3368 | } |
3369 | ||
3370 | static long kvm_dev_ioctl(struct file *filp, | |
3371 | unsigned int ioctl, unsigned long arg) | |
3372 | { | |
07c45a36 | 3373 | long r = -EINVAL; |
f17abe9a AK |
3374 | |
3375 | switch (ioctl) { | |
3376 | case KVM_GET_API_VERSION: | |
f0fe5108 AK |
3377 | if (arg) |
3378 | goto out; | |
f17abe9a AK |
3379 | r = KVM_API_VERSION; |
3380 | break; | |
3381 | case KVM_CREATE_VM: | |
e08b9637 | 3382 | r = kvm_dev_ioctl_create_vm(arg); |
f17abe9a | 3383 | break; |
018d00d2 | 3384 | case KVM_CHECK_EXTENSION: |
784aa3d7 | 3385 | r = kvm_vm_ioctl_check_extension_generic(NULL, arg); |
5d308f45 | 3386 | break; |
07c45a36 | 3387 | case KVM_GET_VCPU_MMAP_SIZE: |
07c45a36 AK |
3388 | if (arg) |
3389 | goto out; | |
adb1ff46 AK |
3390 | r = PAGE_SIZE; /* struct kvm_run */ |
3391 | #ifdef CONFIG_X86 | |
3392 | r += PAGE_SIZE; /* pio data page */ | |
5f94c174 | 3393 | #endif |
4b4357e0 | 3394 | #ifdef CONFIG_KVM_MMIO |
5f94c174 | 3395 | r += PAGE_SIZE; /* coalesced mmio ring page */ |
adb1ff46 | 3396 | #endif |
07c45a36 | 3397 | break; |
d4c9ff2d FEL |
3398 | case KVM_TRACE_ENABLE: |
3399 | case KVM_TRACE_PAUSE: | |
3400 | case KVM_TRACE_DISABLE: | |
2023a29c | 3401 | r = -EOPNOTSUPP; |
d4c9ff2d | 3402 | break; |
6aa8b732 | 3403 | default: |
043405e1 | 3404 | return kvm_arch_dev_ioctl(filp, ioctl, arg); |
6aa8b732 AK |
3405 | } |
3406 | out: | |
3407 | return r; | |
3408 | } | |
3409 | ||
6aa8b732 | 3410 | static struct file_operations kvm_chardev_ops = { |
6aa8b732 | 3411 | .unlocked_ioctl = kvm_dev_ioctl, |
6038f373 | 3412 | .llseek = noop_llseek, |
7ddfd3e0 | 3413 | KVM_COMPAT(kvm_dev_ioctl), |
6aa8b732 AK |
3414 | }; |
3415 | ||
3416 | static struct miscdevice kvm_dev = { | |
bbe4432e | 3417 | KVM_MINOR, |
6aa8b732 AK |
3418 | "kvm", |
3419 | &kvm_chardev_ops, | |
3420 | }; | |
3421 | ||
75b7127c | 3422 | static void hardware_enable_nolock(void *junk) |
1b6c0168 AK |
3423 | { |
3424 | int cpu = raw_smp_processor_id(); | |
10474ae8 | 3425 | int r; |
1b6c0168 | 3426 | |
7f59f492 | 3427 | if (cpumask_test_cpu(cpu, cpus_hardware_enabled)) |
1b6c0168 | 3428 | return; |
10474ae8 | 3429 | |
7f59f492 | 3430 | cpumask_set_cpu(cpu, cpus_hardware_enabled); |
10474ae8 | 3431 | |
13a34e06 | 3432 | r = kvm_arch_hardware_enable(); |
10474ae8 AG |
3433 | |
3434 | if (r) { | |
3435 | cpumask_clear_cpu(cpu, cpus_hardware_enabled); | |
3436 | atomic_inc(&hardware_enable_failed); | |
1170adc6 | 3437 | pr_info("kvm: enabling virtualization on CPU%d failed\n", cpu); |
10474ae8 | 3438 | } |
1b6c0168 AK |
3439 | } |
3440 | ||
8c18b2d2 | 3441 | static int kvm_starting_cpu(unsigned int cpu) |
75b7127c | 3442 | { |
4a937f96 | 3443 | raw_spin_lock(&kvm_count_lock); |
4fa92fb2 PB |
3444 | if (kvm_usage_count) |
3445 | hardware_enable_nolock(NULL); | |
4a937f96 | 3446 | raw_spin_unlock(&kvm_count_lock); |
8c18b2d2 | 3447 | return 0; |
75b7127c TY |
3448 | } |
3449 | ||
3450 | static void hardware_disable_nolock(void *junk) | |
1b6c0168 AK |
3451 | { |
3452 | int cpu = raw_smp_processor_id(); | |
3453 | ||
7f59f492 | 3454 | if (!cpumask_test_cpu(cpu, cpus_hardware_enabled)) |
1b6c0168 | 3455 | return; |
7f59f492 | 3456 | cpumask_clear_cpu(cpu, cpus_hardware_enabled); |
13a34e06 | 3457 | kvm_arch_hardware_disable(); |
1b6c0168 AK |
3458 | } |
3459 | ||
8c18b2d2 | 3460 | static int kvm_dying_cpu(unsigned int cpu) |
75b7127c | 3461 | { |
4a937f96 | 3462 | raw_spin_lock(&kvm_count_lock); |
4fa92fb2 PB |
3463 | if (kvm_usage_count) |
3464 | hardware_disable_nolock(NULL); | |
4a937f96 | 3465 | raw_spin_unlock(&kvm_count_lock); |
8c18b2d2 | 3466 | return 0; |
75b7127c TY |
3467 | } |
3468 | ||
10474ae8 AG |
3469 | static void hardware_disable_all_nolock(void) |
3470 | { | |
3471 | BUG_ON(!kvm_usage_count); | |
3472 | ||
3473 | kvm_usage_count--; | |
3474 | if (!kvm_usage_count) | |
75b7127c | 3475 | on_each_cpu(hardware_disable_nolock, NULL, 1); |
10474ae8 AG |
3476 | } |
3477 | ||
3478 | static void hardware_disable_all(void) | |
3479 | { | |
4a937f96 | 3480 | raw_spin_lock(&kvm_count_lock); |
10474ae8 | 3481 | hardware_disable_all_nolock(); |
4a937f96 | 3482 | raw_spin_unlock(&kvm_count_lock); |
10474ae8 AG |
3483 | } |
3484 | ||
3485 | static int hardware_enable_all(void) | |
3486 | { | |
3487 | int r = 0; | |
3488 | ||
4a937f96 | 3489 | raw_spin_lock(&kvm_count_lock); |
10474ae8 AG |
3490 | |
3491 | kvm_usage_count++; | |
3492 | if (kvm_usage_count == 1) { | |
3493 | atomic_set(&hardware_enable_failed, 0); | |
75b7127c | 3494 | on_each_cpu(hardware_enable_nolock, NULL, 1); |
10474ae8 AG |
3495 | |
3496 | if (atomic_read(&hardware_enable_failed)) { | |
3497 | hardware_disable_all_nolock(); | |
3498 | r = -EBUSY; | |
3499 | } | |
3500 | } | |
3501 | ||
4a937f96 | 3502 | raw_spin_unlock(&kvm_count_lock); |
10474ae8 AG |
3503 | |
3504 | return r; | |
3505 | } | |
3506 | ||
9a2b85c6 | 3507 | static int kvm_reboot(struct notifier_block *notifier, unsigned long val, |
d77c26fc | 3508 | void *v) |
9a2b85c6 | 3509 | { |
8e1c1815 SY |
3510 | /* |
3511 | * Some (well, at least mine) BIOSes hang on reboot if | |
3512 | * in vmx root mode. | |
3513 | * | |
3514 | * And Intel TXT required VMX off for all cpu when system shutdown. | |
3515 | */ | |
1170adc6 | 3516 | pr_info("kvm: exiting hardware virtualization\n"); |
8e1c1815 | 3517 | kvm_rebooting = true; |
75b7127c | 3518 | on_each_cpu(hardware_disable_nolock, NULL, 1); |
9a2b85c6 RR |
3519 | return NOTIFY_OK; |
3520 | } | |
3521 | ||
3522 | static struct notifier_block kvm_reboot_notifier = { | |
3523 | .notifier_call = kvm_reboot, | |
3524 | .priority = 0, | |
3525 | }; | |
3526 | ||
e93f8a0f | 3527 | static void kvm_io_bus_destroy(struct kvm_io_bus *bus) |
2eeb2e94 GH |
3528 | { |
3529 | int i; | |
3530 | ||
3531 | for (i = 0; i < bus->dev_count; i++) { | |
743eeb0b | 3532 | struct kvm_io_device *pos = bus->range[i].dev; |
2eeb2e94 GH |
3533 | |
3534 | kvm_iodevice_destructor(pos); | |
3535 | } | |
e93f8a0f | 3536 | kfree(bus); |
2eeb2e94 GH |
3537 | } |
3538 | ||
c21fbff1 | 3539 | static inline int kvm_io_bus_cmp(const struct kvm_io_range *r1, |
20e87b72 | 3540 | const struct kvm_io_range *r2) |
743eeb0b | 3541 | { |
8f4216c7 JW |
3542 | gpa_t addr1 = r1->addr; |
3543 | gpa_t addr2 = r2->addr; | |
3544 | ||
3545 | if (addr1 < addr2) | |
743eeb0b | 3546 | return -1; |
8f4216c7 JW |
3547 | |
3548 | /* If r2->len == 0, match the exact address. If r2->len != 0, | |
3549 | * accept any overlapping write. Any order is acceptable for | |
3550 | * overlapping ranges, because kvm_io_bus_get_first_dev ensures | |
3551 | * we process all of them. | |
3552 | */ | |
3553 | if (r2->len) { | |
3554 | addr1 += r1->len; | |
3555 | addr2 += r2->len; | |
3556 | } | |
3557 | ||
3558 | if (addr1 > addr2) | |
743eeb0b | 3559 | return 1; |
8f4216c7 | 3560 | |
743eeb0b SL |
3561 | return 0; |
3562 | } | |
3563 | ||
a343c9b7 PB |
3564 | static int kvm_io_bus_sort_cmp(const void *p1, const void *p2) |
3565 | { | |
c21fbff1 | 3566 | return kvm_io_bus_cmp(p1, p2); |
a343c9b7 PB |
3567 | } |
3568 | ||
39369f7a | 3569 | static int kvm_io_bus_get_first_dev(struct kvm_io_bus *bus, |
743eeb0b SL |
3570 | gpa_t addr, int len) |
3571 | { | |
3572 | struct kvm_io_range *range, key; | |
3573 | int off; | |
3574 | ||
3575 | key = (struct kvm_io_range) { | |
3576 | .addr = addr, | |
3577 | .len = len, | |
3578 | }; | |
3579 | ||
3580 | range = bsearch(&key, bus->range, bus->dev_count, | |
3581 | sizeof(struct kvm_io_range), kvm_io_bus_sort_cmp); | |
3582 | if (range == NULL) | |
3583 | return -ENOENT; | |
3584 | ||
3585 | off = range - bus->range; | |
3586 | ||
c21fbff1 | 3587 | while (off > 0 && kvm_io_bus_cmp(&key, &bus->range[off-1]) == 0) |
743eeb0b SL |
3588 | off--; |
3589 | ||
3590 | return off; | |
3591 | } | |
3592 | ||
e32edf4f | 3593 | static int __kvm_io_bus_write(struct kvm_vcpu *vcpu, struct kvm_io_bus *bus, |
126a5af5 CH |
3594 | struct kvm_io_range *range, const void *val) |
3595 | { | |
3596 | int idx; | |
3597 | ||
3598 | idx = kvm_io_bus_get_first_dev(bus, range->addr, range->len); | |
3599 | if (idx < 0) | |
3600 | return -EOPNOTSUPP; | |
3601 | ||
3602 | while (idx < bus->dev_count && | |
c21fbff1 | 3603 | kvm_io_bus_cmp(range, &bus->range[idx]) == 0) { |
e32edf4f | 3604 | if (!kvm_iodevice_write(vcpu, bus->range[idx].dev, range->addr, |
126a5af5 CH |
3605 | range->len, val)) |
3606 | return idx; | |
3607 | idx++; | |
3608 | } | |
3609 | ||
3610 | return -EOPNOTSUPP; | |
3611 | } | |
3612 | ||
bda9020e | 3613 | /* kvm_io_bus_write - called under kvm->slots_lock */ |
e32edf4f | 3614 | int kvm_io_bus_write(struct kvm_vcpu *vcpu, enum kvm_bus bus_idx, gpa_t addr, |
bda9020e | 3615 | int len, const void *val) |
2eeb2e94 | 3616 | { |
90d83dc3 | 3617 | struct kvm_io_bus *bus; |
743eeb0b | 3618 | struct kvm_io_range range; |
126a5af5 | 3619 | int r; |
743eeb0b SL |
3620 | |
3621 | range = (struct kvm_io_range) { | |
3622 | .addr = addr, | |
3623 | .len = len, | |
3624 | }; | |
90d83dc3 | 3625 | |
e32edf4f | 3626 | bus = srcu_dereference(vcpu->kvm->buses[bus_idx], &vcpu->kvm->srcu); |
90db1043 DH |
3627 | if (!bus) |
3628 | return -ENOMEM; | |
e32edf4f | 3629 | r = __kvm_io_bus_write(vcpu, bus, &range, val); |
126a5af5 CH |
3630 | return r < 0 ? r : 0; |
3631 | } | |
3632 | ||
3633 | /* kvm_io_bus_write_cookie - called under kvm->slots_lock */ | |
e32edf4f NN |
3634 | int kvm_io_bus_write_cookie(struct kvm_vcpu *vcpu, enum kvm_bus bus_idx, |
3635 | gpa_t addr, int len, const void *val, long cookie) | |
126a5af5 CH |
3636 | { |
3637 | struct kvm_io_bus *bus; | |
3638 | struct kvm_io_range range; | |
3639 | ||
3640 | range = (struct kvm_io_range) { | |
3641 | .addr = addr, | |
3642 | .len = len, | |
3643 | }; | |
3644 | ||
e32edf4f | 3645 | bus = srcu_dereference(vcpu->kvm->buses[bus_idx], &vcpu->kvm->srcu); |
90db1043 DH |
3646 | if (!bus) |
3647 | return -ENOMEM; | |
126a5af5 CH |
3648 | |
3649 | /* First try the device referenced by cookie. */ | |
3650 | if ((cookie >= 0) && (cookie < bus->dev_count) && | |
c21fbff1 | 3651 | (kvm_io_bus_cmp(&range, &bus->range[cookie]) == 0)) |
e32edf4f | 3652 | if (!kvm_iodevice_write(vcpu, bus->range[cookie].dev, addr, len, |
126a5af5 CH |
3653 | val)) |
3654 | return cookie; | |
3655 | ||
3656 | /* | |
3657 | * cookie contained garbage; fall back to search and return the | |
3658 | * correct cookie value. | |
3659 | */ | |
e32edf4f | 3660 | return __kvm_io_bus_write(vcpu, bus, &range, val); |
126a5af5 CH |
3661 | } |
3662 | ||
e32edf4f NN |
3663 | static int __kvm_io_bus_read(struct kvm_vcpu *vcpu, struct kvm_io_bus *bus, |
3664 | struct kvm_io_range *range, void *val) | |
126a5af5 CH |
3665 | { |
3666 | int idx; | |
3667 | ||
3668 | idx = kvm_io_bus_get_first_dev(bus, range->addr, range->len); | |
743eeb0b SL |
3669 | if (idx < 0) |
3670 | return -EOPNOTSUPP; | |
3671 | ||
3672 | while (idx < bus->dev_count && | |
c21fbff1 | 3673 | kvm_io_bus_cmp(range, &bus->range[idx]) == 0) { |
e32edf4f | 3674 | if (!kvm_iodevice_read(vcpu, bus->range[idx].dev, range->addr, |
126a5af5 CH |
3675 | range->len, val)) |
3676 | return idx; | |
743eeb0b SL |
3677 | idx++; |
3678 | } | |
3679 | ||
bda9020e MT |
3680 | return -EOPNOTSUPP; |
3681 | } | |
68c3b4d1 | 3682 | EXPORT_SYMBOL_GPL(kvm_io_bus_write); |
2eeb2e94 | 3683 | |
bda9020e | 3684 | /* kvm_io_bus_read - called under kvm->slots_lock */ |
e32edf4f | 3685 | int kvm_io_bus_read(struct kvm_vcpu *vcpu, enum kvm_bus bus_idx, gpa_t addr, |
e93f8a0f | 3686 | int len, void *val) |
bda9020e | 3687 | { |
90d83dc3 | 3688 | struct kvm_io_bus *bus; |
743eeb0b | 3689 | struct kvm_io_range range; |
126a5af5 | 3690 | int r; |
743eeb0b SL |
3691 | |
3692 | range = (struct kvm_io_range) { | |
3693 | .addr = addr, | |
3694 | .len = len, | |
3695 | }; | |
e93f8a0f | 3696 | |
e32edf4f | 3697 | bus = srcu_dereference(vcpu->kvm->buses[bus_idx], &vcpu->kvm->srcu); |
90db1043 DH |
3698 | if (!bus) |
3699 | return -ENOMEM; | |
e32edf4f | 3700 | r = __kvm_io_bus_read(vcpu, bus, &range, val); |
126a5af5 CH |
3701 | return r < 0 ? r : 0; |
3702 | } | |
743eeb0b | 3703 | |
2eeb2e94 | 3704 | |
79fac95e | 3705 | /* Caller must hold slots_lock. */ |
743eeb0b SL |
3706 | int kvm_io_bus_register_dev(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr, |
3707 | int len, struct kvm_io_device *dev) | |
6c474694 | 3708 | { |
d4c67a7a | 3709 | int i; |
e93f8a0f | 3710 | struct kvm_io_bus *new_bus, *bus; |
d4c67a7a | 3711 | struct kvm_io_range range; |
090b7aff | 3712 | |
4a12f951 | 3713 | bus = kvm_get_bus(kvm, bus_idx); |
90db1043 DH |
3714 | if (!bus) |
3715 | return -ENOMEM; | |
3716 | ||
6ea34c9b AK |
3717 | /* exclude ioeventfd which is limited by maximum fd */ |
3718 | if (bus->dev_count - bus->ioeventfd_count > NR_IOBUS_DEVS - 1) | |
090b7aff | 3719 | return -ENOSPC; |
2eeb2e94 | 3720 | |
90952cd3 | 3721 | new_bus = kmalloc(struct_size(bus, range, bus->dev_count + 1), |
b12ce36a | 3722 | GFP_KERNEL_ACCOUNT); |
e93f8a0f MT |
3723 | if (!new_bus) |
3724 | return -ENOMEM; | |
d4c67a7a GH |
3725 | |
3726 | range = (struct kvm_io_range) { | |
3727 | .addr = addr, | |
3728 | .len = len, | |
3729 | .dev = dev, | |
3730 | }; | |
3731 | ||
3732 | for (i = 0; i < bus->dev_count; i++) | |
3733 | if (kvm_io_bus_cmp(&bus->range[i], &range) > 0) | |
3734 | break; | |
3735 | ||
3736 | memcpy(new_bus, bus, sizeof(*bus) + i * sizeof(struct kvm_io_range)); | |
3737 | new_bus->dev_count++; | |
3738 | new_bus->range[i] = range; | |
3739 | memcpy(new_bus->range + i + 1, bus->range + i, | |
3740 | (bus->dev_count - i) * sizeof(struct kvm_io_range)); | |
e93f8a0f MT |
3741 | rcu_assign_pointer(kvm->buses[bus_idx], new_bus); |
3742 | synchronize_srcu_expedited(&kvm->srcu); | |
3743 | kfree(bus); | |
090b7aff GH |
3744 | |
3745 | return 0; | |
3746 | } | |
3747 | ||
79fac95e | 3748 | /* Caller must hold slots_lock. */ |
90db1043 DH |
3749 | void kvm_io_bus_unregister_dev(struct kvm *kvm, enum kvm_bus bus_idx, |
3750 | struct kvm_io_device *dev) | |
090b7aff | 3751 | { |
90db1043 | 3752 | int i; |
e93f8a0f | 3753 | struct kvm_io_bus *new_bus, *bus; |
090b7aff | 3754 | |
4a12f951 | 3755 | bus = kvm_get_bus(kvm, bus_idx); |
df630b8c | 3756 | if (!bus) |
90db1043 | 3757 | return; |
df630b8c | 3758 | |
a1300716 AK |
3759 | for (i = 0; i < bus->dev_count; i++) |
3760 | if (bus->range[i].dev == dev) { | |
090b7aff GH |
3761 | break; |
3762 | } | |
e93f8a0f | 3763 | |
90db1043 DH |
3764 | if (i == bus->dev_count) |
3765 | return; | |
a1300716 | 3766 | |
90952cd3 | 3767 | new_bus = kmalloc(struct_size(bus, range, bus->dev_count - 1), |
b12ce36a | 3768 | GFP_KERNEL_ACCOUNT); |
90db1043 DH |
3769 | if (!new_bus) { |
3770 | pr_err("kvm: failed to shrink bus, removing it completely\n"); | |
3771 | goto broken; | |
3772 | } | |
a1300716 AK |
3773 | |
3774 | memcpy(new_bus, bus, sizeof(*bus) + i * sizeof(struct kvm_io_range)); | |
3775 | new_bus->dev_count--; | |
3776 | memcpy(new_bus->range + i, bus->range + i + 1, | |
3777 | (new_bus->dev_count - i) * sizeof(struct kvm_io_range)); | |
e93f8a0f | 3778 | |
90db1043 | 3779 | broken: |
e93f8a0f MT |
3780 | rcu_assign_pointer(kvm->buses[bus_idx], new_bus); |
3781 | synchronize_srcu_expedited(&kvm->srcu); | |
3782 | kfree(bus); | |
90db1043 | 3783 | return; |
2eeb2e94 GH |
3784 | } |
3785 | ||
8a39d006 AP |
3786 | struct kvm_io_device *kvm_io_bus_get_dev(struct kvm *kvm, enum kvm_bus bus_idx, |
3787 | gpa_t addr) | |
3788 | { | |
3789 | struct kvm_io_bus *bus; | |
3790 | int dev_idx, srcu_idx; | |
3791 | struct kvm_io_device *iodev = NULL; | |
3792 | ||
3793 | srcu_idx = srcu_read_lock(&kvm->srcu); | |
3794 | ||
3795 | bus = srcu_dereference(kvm->buses[bus_idx], &kvm->srcu); | |
90db1043 DH |
3796 | if (!bus) |
3797 | goto out_unlock; | |
8a39d006 AP |
3798 | |
3799 | dev_idx = kvm_io_bus_get_first_dev(bus, addr, 1); | |
3800 | if (dev_idx < 0) | |
3801 | goto out_unlock; | |
3802 | ||
3803 | iodev = bus->range[dev_idx].dev; | |
3804 | ||
3805 | out_unlock: | |
3806 | srcu_read_unlock(&kvm->srcu, srcu_idx); | |
3807 | ||
3808 | return iodev; | |
3809 | } | |
3810 | EXPORT_SYMBOL_GPL(kvm_io_bus_get_dev); | |
3811 | ||
536a6f88 JF |
3812 | static int kvm_debugfs_open(struct inode *inode, struct file *file, |
3813 | int (*get)(void *, u64 *), int (*set)(void *, u64), | |
3814 | const char *fmt) | |
3815 | { | |
3816 | struct kvm_stat_data *stat_data = (struct kvm_stat_data *) | |
3817 | inode->i_private; | |
3818 | ||
3819 | /* The debugfs files are a reference to the kvm struct which | |
3820 | * is still valid when kvm_destroy_vm is called. | |
3821 | * To avoid the race between open and the removal of the debugfs | |
3822 | * directory we test against the users count. | |
3823 | */ | |
e3736c3e | 3824 | if (!refcount_inc_not_zero(&stat_data->kvm->users_count)) |
536a6f88 JF |
3825 | return -ENOENT; |
3826 | ||
3827 | if (simple_attr_open(inode, file, get, set, fmt)) { | |
3828 | kvm_put_kvm(stat_data->kvm); | |
3829 | return -ENOMEM; | |
3830 | } | |
3831 | ||
3832 | return 0; | |
3833 | } | |
3834 | ||
3835 | static int kvm_debugfs_release(struct inode *inode, struct file *file) | |
3836 | { | |
3837 | struct kvm_stat_data *stat_data = (struct kvm_stat_data *) | |
3838 | inode->i_private; | |
3839 | ||
3840 | simple_attr_release(inode, file); | |
3841 | kvm_put_kvm(stat_data->kvm); | |
3842 | ||
3843 | return 0; | |
3844 | } | |
3845 | ||
3846 | static int vm_stat_get_per_vm(void *data, u64 *val) | |
3847 | { | |
3848 | struct kvm_stat_data *stat_data = (struct kvm_stat_data *)data; | |
3849 | ||
8a7e75d4 | 3850 | *val = *(ulong *)((void *)stat_data->kvm + stat_data->offset); |
536a6f88 JF |
3851 | |
3852 | return 0; | |
3853 | } | |
3854 | ||
ce35ef27 SJS |
3855 | static int vm_stat_clear_per_vm(void *data, u64 val) |
3856 | { | |
3857 | struct kvm_stat_data *stat_data = (struct kvm_stat_data *)data; | |
3858 | ||
3859 | if (val) | |
3860 | return -EINVAL; | |
3861 | ||
3862 | *(ulong *)((void *)stat_data->kvm + stat_data->offset) = 0; | |
3863 | ||
3864 | return 0; | |
3865 | } | |
3866 | ||
536a6f88 JF |
3867 | static int vm_stat_get_per_vm_open(struct inode *inode, struct file *file) |
3868 | { | |
3869 | __simple_attr_check_format("%llu\n", 0ull); | |
3870 | return kvm_debugfs_open(inode, file, vm_stat_get_per_vm, | |
ce35ef27 | 3871 | vm_stat_clear_per_vm, "%llu\n"); |
536a6f88 JF |
3872 | } |
3873 | ||
3874 | static const struct file_operations vm_stat_get_per_vm_fops = { | |
3875 | .owner = THIS_MODULE, | |
3876 | .open = vm_stat_get_per_vm_open, | |
3877 | .release = kvm_debugfs_release, | |
3878 | .read = simple_attr_read, | |
3879 | .write = simple_attr_write, | |
3bed8888 | 3880 | .llseek = no_llseek, |
536a6f88 JF |
3881 | }; |
3882 | ||
3883 | static int vcpu_stat_get_per_vm(void *data, u64 *val) | |
3884 | { | |
3885 | int i; | |
3886 | struct kvm_stat_data *stat_data = (struct kvm_stat_data *)data; | |
3887 | struct kvm_vcpu *vcpu; | |
3888 | ||
3889 | *val = 0; | |
3890 | ||
3891 | kvm_for_each_vcpu(i, vcpu, stat_data->kvm) | |
8a7e75d4 | 3892 | *val += *(u64 *)((void *)vcpu + stat_data->offset); |
536a6f88 JF |
3893 | |
3894 | return 0; | |
3895 | } | |
3896 | ||
ce35ef27 SJS |
3897 | static int vcpu_stat_clear_per_vm(void *data, u64 val) |
3898 | { | |
3899 | int i; | |
3900 | struct kvm_stat_data *stat_data = (struct kvm_stat_data *)data; | |
3901 | struct kvm_vcpu *vcpu; | |
3902 | ||
3903 | if (val) | |
3904 | return -EINVAL; | |
3905 | ||
3906 | kvm_for_each_vcpu(i, vcpu, stat_data->kvm) | |
3907 | *(u64 *)((void *)vcpu + stat_data->offset) = 0; | |
3908 | ||
3909 | return 0; | |
3910 | } | |
3911 | ||
536a6f88 JF |
3912 | static int vcpu_stat_get_per_vm_open(struct inode *inode, struct file *file) |
3913 | { | |
3914 | __simple_attr_check_format("%llu\n", 0ull); | |
3915 | return kvm_debugfs_open(inode, file, vcpu_stat_get_per_vm, | |
ce35ef27 | 3916 | vcpu_stat_clear_per_vm, "%llu\n"); |
536a6f88 JF |
3917 | } |
3918 | ||
3919 | static const struct file_operations vcpu_stat_get_per_vm_fops = { | |
3920 | .owner = THIS_MODULE, | |
3921 | .open = vcpu_stat_get_per_vm_open, | |
3922 | .release = kvm_debugfs_release, | |
3923 | .read = simple_attr_read, | |
3924 | .write = simple_attr_write, | |
3bed8888 | 3925 | .llseek = no_llseek, |
536a6f88 JF |
3926 | }; |
3927 | ||
3928 | static const struct file_operations *stat_fops_per_vm[] = { | |
3929 | [KVM_STAT_VCPU] = &vcpu_stat_get_per_vm_fops, | |
3930 | [KVM_STAT_VM] = &vm_stat_get_per_vm_fops, | |
3931 | }; | |
3932 | ||
8b88b099 | 3933 | static int vm_stat_get(void *_offset, u64 *val) |
ba1389b7 AK |
3934 | { |
3935 | unsigned offset = (long)_offset; | |
ba1389b7 | 3936 | struct kvm *kvm; |
536a6f88 JF |
3937 | struct kvm_stat_data stat_tmp = {.offset = offset}; |
3938 | u64 tmp_val; | |
ba1389b7 | 3939 | |
8b88b099 | 3940 | *val = 0; |
2f303b74 | 3941 | spin_lock(&kvm_lock); |
536a6f88 JF |
3942 | list_for_each_entry(kvm, &vm_list, vm_list) { |
3943 | stat_tmp.kvm = kvm; | |
3944 | vm_stat_get_per_vm((void *)&stat_tmp, &tmp_val); | |
3945 | *val += tmp_val; | |
3946 | } | |
2f303b74 | 3947 | spin_unlock(&kvm_lock); |
8b88b099 | 3948 | return 0; |
ba1389b7 AK |
3949 | } |
3950 | ||
ce35ef27 SJS |
3951 | static int vm_stat_clear(void *_offset, u64 val) |
3952 | { | |
3953 | unsigned offset = (long)_offset; | |
3954 | struct kvm *kvm; | |
3955 | struct kvm_stat_data stat_tmp = {.offset = offset}; | |
3956 | ||
3957 | if (val) | |
3958 | return -EINVAL; | |
3959 | ||
3960 | spin_lock(&kvm_lock); | |
3961 | list_for_each_entry(kvm, &vm_list, vm_list) { | |
3962 | stat_tmp.kvm = kvm; | |
3963 | vm_stat_clear_per_vm((void *)&stat_tmp, 0); | |
3964 | } | |
3965 | spin_unlock(&kvm_lock); | |
3966 | ||
3967 | return 0; | |
3968 | } | |
3969 | ||
3970 | DEFINE_SIMPLE_ATTRIBUTE(vm_stat_fops, vm_stat_get, vm_stat_clear, "%llu\n"); | |
ba1389b7 | 3971 | |
8b88b099 | 3972 | static int vcpu_stat_get(void *_offset, u64 *val) |
1165f5fe AK |
3973 | { |
3974 | unsigned offset = (long)_offset; | |
1165f5fe | 3975 | struct kvm *kvm; |
536a6f88 JF |
3976 | struct kvm_stat_data stat_tmp = {.offset = offset}; |
3977 | u64 tmp_val; | |
1165f5fe | 3978 | |
8b88b099 | 3979 | *val = 0; |
2f303b74 | 3980 | spin_lock(&kvm_lock); |
536a6f88 JF |
3981 | list_for_each_entry(kvm, &vm_list, vm_list) { |
3982 | stat_tmp.kvm = kvm; | |
3983 | vcpu_stat_get_per_vm((void *)&stat_tmp, &tmp_val); | |
3984 | *val += tmp_val; | |
3985 | } | |
2f303b74 | 3986 | spin_unlock(&kvm_lock); |
8b88b099 | 3987 | return 0; |
1165f5fe AK |
3988 | } |
3989 | ||
ce35ef27 SJS |
3990 | static int vcpu_stat_clear(void *_offset, u64 val) |
3991 | { | |
3992 | unsigned offset = (long)_offset; | |
3993 | struct kvm *kvm; | |
3994 | struct kvm_stat_data stat_tmp = {.offset = offset}; | |
3995 | ||
3996 | if (val) | |
3997 | return -EINVAL; | |
3998 | ||
3999 | spin_lock(&kvm_lock); | |
4000 | list_for_each_entry(kvm, &vm_list, vm_list) { | |
4001 | stat_tmp.kvm = kvm; | |
4002 | vcpu_stat_clear_per_vm((void *)&stat_tmp, 0); | |
4003 | } | |
4004 | spin_unlock(&kvm_lock); | |
4005 | ||
4006 | return 0; | |
4007 | } | |
4008 | ||
4009 | DEFINE_SIMPLE_ATTRIBUTE(vcpu_stat_fops, vcpu_stat_get, vcpu_stat_clear, | |
4010 | "%llu\n"); | |
ba1389b7 | 4011 | |
828c0950 | 4012 | static const struct file_operations *stat_fops[] = { |
ba1389b7 AK |
4013 | [KVM_STAT_VCPU] = &vcpu_stat_fops, |
4014 | [KVM_STAT_VM] = &vm_stat_fops, | |
4015 | }; | |
1165f5fe | 4016 | |
286de8f6 CI |
4017 | static void kvm_uevent_notify_change(unsigned int type, struct kvm *kvm) |
4018 | { | |
4019 | struct kobj_uevent_env *env; | |
286de8f6 CI |
4020 | unsigned long long created, active; |
4021 | ||
4022 | if (!kvm_dev.this_device || !kvm) | |
4023 | return; | |
4024 | ||
4025 | spin_lock(&kvm_lock); | |
4026 | if (type == KVM_EVENT_CREATE_VM) { | |
4027 | kvm_createvm_count++; | |
4028 | kvm_active_vms++; | |
4029 | } else if (type == KVM_EVENT_DESTROY_VM) { | |
4030 | kvm_active_vms--; | |
4031 | } | |
4032 | created = kvm_createvm_count; | |
4033 | active = kvm_active_vms; | |
4034 | spin_unlock(&kvm_lock); | |
4035 | ||
b12ce36a | 4036 | env = kzalloc(sizeof(*env), GFP_KERNEL_ACCOUNT); |
286de8f6 CI |
4037 | if (!env) |
4038 | return; | |
4039 | ||
4040 | add_uevent_var(env, "CREATED=%llu", created); | |
4041 | add_uevent_var(env, "COUNT=%llu", active); | |
4042 | ||
fdeaf7e3 | 4043 | if (type == KVM_EVENT_CREATE_VM) { |
286de8f6 | 4044 | add_uevent_var(env, "EVENT=create"); |
fdeaf7e3 CI |
4045 | kvm->userspace_pid = task_pid_nr(current); |
4046 | } else if (type == KVM_EVENT_DESTROY_VM) { | |
286de8f6 | 4047 | add_uevent_var(env, "EVENT=destroy"); |
fdeaf7e3 CI |
4048 | } |
4049 | add_uevent_var(env, "PID=%d", kvm->userspace_pid); | |
286de8f6 CI |
4050 | |
4051 | if (kvm->debugfs_dentry) { | |
b12ce36a | 4052 | char *tmp, *p = kmalloc(PATH_MAX, GFP_KERNEL_ACCOUNT); |
fdeaf7e3 CI |
4053 | |
4054 | if (p) { | |
4055 | tmp = dentry_path_raw(kvm->debugfs_dentry, p, PATH_MAX); | |
4056 | if (!IS_ERR(tmp)) | |
4057 | add_uevent_var(env, "STATS_PATH=%s", tmp); | |
4058 | kfree(p); | |
286de8f6 CI |
4059 | } |
4060 | } | |
4061 | /* no need for checks, since we are adding at most only 5 keys */ | |
4062 | env->envp[env->envp_idx++] = NULL; | |
4063 | kobject_uevent_env(&kvm_dev.this_device->kobj, KOBJ_CHANGE, env->envp); | |
4064 | kfree(env); | |
286de8f6 CI |
4065 | } |
4066 | ||
929f45e3 | 4067 | static void kvm_init_debug(void) |
6aa8b732 AK |
4068 | { |
4069 | struct kvm_stats_debugfs_item *p; | |
4070 | ||
76f7c879 | 4071 | kvm_debugfs_dir = debugfs_create_dir("kvm", NULL); |
4f69b680 | 4072 | |
536a6f88 JF |
4073 | kvm_debugfs_num_entries = 0; |
4074 | for (p = debugfs_entries; p->name; ++p, kvm_debugfs_num_entries++) { | |
929f45e3 GKH |
4075 | debugfs_create_file(p->name, 0644, kvm_debugfs_dir, |
4076 | (void *)(long)p->offset, | |
4077 | stat_fops[p->kind]); | |
4f69b680 | 4078 | } |
6aa8b732 AK |
4079 | } |
4080 | ||
fb3600cc | 4081 | static int kvm_suspend(void) |
59ae6c6b | 4082 | { |
10474ae8 | 4083 | if (kvm_usage_count) |
75b7127c | 4084 | hardware_disable_nolock(NULL); |
59ae6c6b AK |
4085 | return 0; |
4086 | } | |
4087 | ||
fb3600cc | 4088 | static void kvm_resume(void) |
59ae6c6b | 4089 | { |
ca84d1a2 | 4090 | if (kvm_usage_count) { |
4a937f96 | 4091 | WARN_ON(raw_spin_is_locked(&kvm_count_lock)); |
75b7127c | 4092 | hardware_enable_nolock(NULL); |
ca84d1a2 | 4093 | } |
59ae6c6b AK |
4094 | } |
4095 | ||
fb3600cc | 4096 | static struct syscore_ops kvm_syscore_ops = { |
59ae6c6b AK |
4097 | .suspend = kvm_suspend, |
4098 | .resume = kvm_resume, | |
4099 | }; | |
4100 | ||
15ad7146 AK |
4101 | static inline |
4102 | struct kvm_vcpu *preempt_notifier_to_vcpu(struct preempt_notifier *pn) | |
4103 | { | |
4104 | return container_of(pn, struct kvm_vcpu, preempt_notifier); | |
4105 | } | |
4106 | ||
4107 | static void kvm_sched_in(struct preempt_notifier *pn, int cpu) | |
4108 | { | |
4109 | struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn); | |
f95ef0cd | 4110 | |
3a08a8f9 R |
4111 | if (vcpu->preempted) |
4112 | vcpu->preempted = false; | |
15ad7146 | 4113 | |
e790d9ef RK |
4114 | kvm_arch_sched_in(vcpu, cpu); |
4115 | ||
e9b11c17 | 4116 | kvm_arch_vcpu_load(vcpu, cpu); |
15ad7146 AK |
4117 | } |
4118 | ||
4119 | static void kvm_sched_out(struct preempt_notifier *pn, | |
4120 | struct task_struct *next) | |
4121 | { | |
4122 | struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn); | |
4123 | ||
3a08a8f9 R |
4124 | if (current->state == TASK_RUNNING) |
4125 | vcpu->preempted = true; | |
e9b11c17 | 4126 | kvm_arch_vcpu_put(vcpu); |
15ad7146 AK |
4127 | } |
4128 | ||
0ee75bea | 4129 | int kvm_init(void *opaque, unsigned vcpu_size, unsigned vcpu_align, |
c16f862d | 4130 | struct module *module) |
6aa8b732 AK |
4131 | { |
4132 | int r; | |
002c7f7c | 4133 | int cpu; |
6aa8b732 | 4134 | |
f8c16bba ZX |
4135 | r = kvm_arch_init(opaque); |
4136 | if (r) | |
d2308784 | 4137 | goto out_fail; |
cb498ea2 | 4138 | |
7dac16c3 AH |
4139 | /* |
4140 | * kvm_arch_init makes sure there's at most one caller | |
4141 | * for architectures that support multiple implementations, | |
4142 | * like intel and amd on x86. | |
36343f6e PB |
4143 | * kvm_arch_init must be called before kvm_irqfd_init to avoid creating |
4144 | * conflicts in case kvm is already setup for another implementation. | |
7dac16c3 | 4145 | */ |
36343f6e PB |
4146 | r = kvm_irqfd_init(); |
4147 | if (r) | |
4148 | goto out_irqfd; | |
7dac16c3 | 4149 | |
8437a617 | 4150 | if (!zalloc_cpumask_var(&cpus_hardware_enabled, GFP_KERNEL)) { |
7f59f492 RR |
4151 | r = -ENOMEM; |
4152 | goto out_free_0; | |
4153 | } | |
4154 | ||
e9b11c17 | 4155 | r = kvm_arch_hardware_setup(); |
6aa8b732 | 4156 | if (r < 0) |
7f59f492 | 4157 | goto out_free_0a; |
6aa8b732 | 4158 | |
002c7f7c YS |
4159 | for_each_online_cpu(cpu) { |
4160 | smp_call_function_single(cpu, | |
e9b11c17 | 4161 | kvm_arch_check_processor_compat, |
8691e5a8 | 4162 | &r, 1); |
002c7f7c | 4163 | if (r < 0) |
d2308784 | 4164 | goto out_free_1; |
002c7f7c YS |
4165 | } |
4166 | ||
73c1b41e | 4167 | r = cpuhp_setup_state_nocalls(CPUHP_AP_KVM_STARTING, "kvm/cpu:starting", |
8c18b2d2 | 4168 | kvm_starting_cpu, kvm_dying_cpu); |
774c47f1 | 4169 | if (r) |
d2308784 | 4170 | goto out_free_2; |
6aa8b732 AK |
4171 | register_reboot_notifier(&kvm_reboot_notifier); |
4172 | ||
c16f862d | 4173 | /* A kmem cache lets us meet the alignment requirements of fx_save. */ |
0ee75bea AK |
4174 | if (!vcpu_align) |
4175 | vcpu_align = __alignof__(struct kvm_vcpu); | |
46515736 PB |
4176 | kvm_vcpu_cache = |
4177 | kmem_cache_create_usercopy("kvm_vcpu", vcpu_size, vcpu_align, | |
4178 | SLAB_ACCOUNT, | |
4179 | offsetof(struct kvm_vcpu, arch), | |
4180 | sizeof_field(struct kvm_vcpu, arch), | |
4181 | NULL); | |
c16f862d RR |
4182 | if (!kvm_vcpu_cache) { |
4183 | r = -ENOMEM; | |
fb3600cc | 4184 | goto out_free_3; |
c16f862d RR |
4185 | } |
4186 | ||
af585b92 GN |
4187 | r = kvm_async_pf_init(); |
4188 | if (r) | |
4189 | goto out_free; | |
4190 | ||
6aa8b732 | 4191 | kvm_chardev_ops.owner = module; |
3d3aab1b CB |
4192 | kvm_vm_fops.owner = module; |
4193 | kvm_vcpu_fops.owner = module; | |
6aa8b732 AK |
4194 | |
4195 | r = misc_register(&kvm_dev); | |
4196 | if (r) { | |
1170adc6 | 4197 | pr_err("kvm: misc device register failed\n"); |
af585b92 | 4198 | goto out_unreg; |
6aa8b732 AK |
4199 | } |
4200 | ||
fb3600cc RW |
4201 | register_syscore_ops(&kvm_syscore_ops); |
4202 | ||
15ad7146 AK |
4203 | kvm_preempt_ops.sched_in = kvm_sched_in; |
4204 | kvm_preempt_ops.sched_out = kvm_sched_out; | |
4205 | ||
929f45e3 | 4206 | kvm_init_debug(); |
0ea4ed8e | 4207 | |
3c3c29fd PB |
4208 | r = kvm_vfio_ops_init(); |
4209 | WARN_ON(r); | |
4210 | ||
c7addb90 | 4211 | return 0; |
6aa8b732 | 4212 | |
af585b92 GN |
4213 | out_unreg: |
4214 | kvm_async_pf_deinit(); | |
6aa8b732 | 4215 | out_free: |
c16f862d | 4216 | kmem_cache_destroy(kvm_vcpu_cache); |
d2308784 | 4217 | out_free_3: |
6aa8b732 | 4218 | unregister_reboot_notifier(&kvm_reboot_notifier); |
8c18b2d2 | 4219 | cpuhp_remove_state_nocalls(CPUHP_AP_KVM_STARTING); |
d2308784 | 4220 | out_free_2: |
d2308784 | 4221 | out_free_1: |
e9b11c17 | 4222 | kvm_arch_hardware_unsetup(); |
7f59f492 RR |
4223 | out_free_0a: |
4224 | free_cpumask_var(cpus_hardware_enabled); | |
d2308784 | 4225 | out_free_0: |
a0f155e9 | 4226 | kvm_irqfd_exit(); |
36343f6e | 4227 | out_irqfd: |
7dac16c3 AH |
4228 | kvm_arch_exit(); |
4229 | out_fail: | |
6aa8b732 AK |
4230 | return r; |
4231 | } | |
cb498ea2 | 4232 | EXPORT_SYMBOL_GPL(kvm_init); |
6aa8b732 | 4233 | |
cb498ea2 | 4234 | void kvm_exit(void) |
6aa8b732 | 4235 | { |
4bd33b56 | 4236 | debugfs_remove_recursive(kvm_debugfs_dir); |
6aa8b732 | 4237 | misc_deregister(&kvm_dev); |
c16f862d | 4238 | kmem_cache_destroy(kvm_vcpu_cache); |
af585b92 | 4239 | kvm_async_pf_deinit(); |
fb3600cc | 4240 | unregister_syscore_ops(&kvm_syscore_ops); |
6aa8b732 | 4241 | unregister_reboot_notifier(&kvm_reboot_notifier); |
8c18b2d2 | 4242 | cpuhp_remove_state_nocalls(CPUHP_AP_KVM_STARTING); |
75b7127c | 4243 | on_each_cpu(hardware_disable_nolock, NULL, 1); |
e9b11c17 | 4244 | kvm_arch_hardware_unsetup(); |
f8c16bba | 4245 | kvm_arch_exit(); |
a0f155e9 | 4246 | kvm_irqfd_exit(); |
7f59f492 | 4247 | free_cpumask_var(cpus_hardware_enabled); |
571ee1b6 | 4248 | kvm_vfio_ops_exit(); |
6aa8b732 | 4249 | } |
cb498ea2 | 4250 | EXPORT_SYMBOL_GPL(kvm_exit); |