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20c8ccb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
6aa8b732 AK |
2 | /* |
3 | * Kernel-based Virtual Machine driver for Linux | |
4 | * | |
5 | * This module enables machines with Intel VT-x extensions to run virtual | |
6 | * machines without emulation or binary translation. | |
7 | * | |
8 | * Copyright (C) 2006 Qumranet, Inc. | |
9611c187 | 9 | * Copyright 2010 Red Hat, Inc. and/or its affiliates. |
6aa8b732 AK |
10 | * |
11 | * Authors: | |
12 | * Avi Kivity <avi@qumranet.com> | |
13 | * Yaniv Kamay <yaniv@qumranet.com> | |
6aa8b732 AK |
14 | */ |
15 | ||
af669ac6 | 16 | #include <kvm/iodev.h> |
6aa8b732 | 17 | |
edf88417 | 18 | #include <linux/kvm_host.h> |
6aa8b732 AK |
19 | #include <linux/kvm.h> |
20 | #include <linux/module.h> | |
21 | #include <linux/errno.h> | |
6aa8b732 | 22 | #include <linux/percpu.h> |
6aa8b732 AK |
23 | #include <linux/mm.h> |
24 | #include <linux/miscdevice.h> | |
25 | #include <linux/vmalloc.h> | |
6aa8b732 | 26 | #include <linux/reboot.h> |
6aa8b732 AK |
27 | #include <linux/debugfs.h> |
28 | #include <linux/highmem.h> | |
29 | #include <linux/file.h> | |
fb3600cc | 30 | #include <linux/syscore_ops.h> |
774c47f1 | 31 | #include <linux/cpu.h> |
174cd4b1 | 32 | #include <linux/sched/signal.h> |
6e84f315 | 33 | #include <linux/sched/mm.h> |
03441a34 | 34 | #include <linux/sched/stat.h> |
d9e368d6 AK |
35 | #include <linux/cpumask.h> |
36 | #include <linux/smp.h> | |
d6d28168 | 37 | #include <linux/anon_inodes.h> |
04d2cc77 | 38 | #include <linux/profile.h> |
7aa81cc0 | 39 | #include <linux/kvm_para.h> |
6fc138d2 | 40 | #include <linux/pagemap.h> |
8d4e1288 | 41 | #include <linux/mman.h> |
35149e21 | 42 | #include <linux/swap.h> |
e56d532f | 43 | #include <linux/bitops.h> |
547de29e | 44 | #include <linux/spinlock.h> |
6ff5894c | 45 | #include <linux/compat.h> |
bc6678a3 | 46 | #include <linux/srcu.h> |
8f0b1ab6 | 47 | #include <linux/hugetlb.h> |
5a0e3ad6 | 48 | #include <linux/slab.h> |
743eeb0b SL |
49 | #include <linux/sort.h> |
50 | #include <linux/bsearch.h> | |
c011d23b | 51 | #include <linux/io.h> |
2eb06c30 | 52 | #include <linux/lockdep.h> |
c57c8046 | 53 | #include <linux/kthread.h> |
6aa8b732 | 54 | |
e495606d | 55 | #include <asm/processor.h> |
2ea75be3 | 56 | #include <asm/ioctl.h> |
7c0f6ba6 | 57 | #include <linux/uaccess.h> |
3e021bf5 | 58 | #include <asm/pgtable.h> |
6aa8b732 | 59 | |
5f94c174 | 60 | #include "coalesced_mmio.h" |
af585b92 | 61 | #include "async_pf.h" |
3c3c29fd | 62 | #include "vfio.h" |
5f94c174 | 63 | |
229456fc MT |
64 | #define CREATE_TRACE_POINTS |
65 | #include <trace/events/kvm.h> | |
66 | ||
536a6f88 JF |
67 | /* Worst case buffer size needed for holding an integer. */ |
68 | #define ITOA_MAX_LEN 12 | |
69 | ||
6aa8b732 AK |
70 | MODULE_AUTHOR("Qumranet"); |
71 | MODULE_LICENSE("GPL"); | |
72 | ||
920552b2 | 73 | /* Architectures should define their poll value according to the halt latency */ |
ec76d819 | 74 | unsigned int halt_poll_ns = KVM_HALT_POLL_NS_DEFAULT; |
039c5d1b | 75 | module_param(halt_poll_ns, uint, 0644); |
ec76d819 | 76 | EXPORT_SYMBOL_GPL(halt_poll_ns); |
f7819512 | 77 | |
aca6ff29 | 78 | /* Default doubles per-vcpu halt_poll_ns. */ |
ec76d819 | 79 | unsigned int halt_poll_ns_grow = 2; |
039c5d1b | 80 | module_param(halt_poll_ns_grow, uint, 0644); |
ec76d819 | 81 | EXPORT_SYMBOL_GPL(halt_poll_ns_grow); |
aca6ff29 | 82 | |
49113d36 NW |
83 | /* The start value to grow halt_poll_ns from */ |
84 | unsigned int halt_poll_ns_grow_start = 10000; /* 10us */ | |
85 | module_param(halt_poll_ns_grow_start, uint, 0644); | |
86 | EXPORT_SYMBOL_GPL(halt_poll_ns_grow_start); | |
87 | ||
aca6ff29 | 88 | /* Default resets per-vcpu halt_poll_ns . */ |
ec76d819 | 89 | unsigned int halt_poll_ns_shrink; |
039c5d1b | 90 | module_param(halt_poll_ns_shrink, uint, 0644); |
ec76d819 | 91 | EXPORT_SYMBOL_GPL(halt_poll_ns_shrink); |
aca6ff29 | 92 | |
fa40a821 MT |
93 | /* |
94 | * Ordering of locks: | |
95 | * | |
b7d409de | 96 | * kvm->lock --> kvm->slots_lock --> kvm->irq_lock |
fa40a821 MT |
97 | */ |
98 | ||
0d9ce162 | 99 | DEFINE_MUTEX(kvm_lock); |
4a937f96 | 100 | static DEFINE_RAW_SPINLOCK(kvm_count_lock); |
e9b11c17 | 101 | LIST_HEAD(vm_list); |
133de902 | 102 | |
7f59f492 | 103 | static cpumask_var_t cpus_hardware_enabled; |
f4fee932 | 104 | static int kvm_usage_count; |
10474ae8 | 105 | static atomic_t hardware_enable_failed; |
1b6c0168 | 106 | |
aaba298c | 107 | static struct kmem_cache *kvm_vcpu_cache; |
1165f5fe | 108 | |
15ad7146 AK |
109 | static __read_mostly struct preempt_ops kvm_preempt_ops; |
110 | ||
76f7c879 | 111 | struct dentry *kvm_debugfs_dir; |
e23a808b | 112 | EXPORT_SYMBOL_GPL(kvm_debugfs_dir); |
6aa8b732 | 113 | |
536a6f88 | 114 | static int kvm_debugfs_num_entries; |
09cbcef6 | 115 | static const struct file_operations stat_fops_per_vm; |
536a6f88 | 116 | |
bccf2150 AK |
117 | static long kvm_vcpu_ioctl(struct file *file, unsigned int ioctl, |
118 | unsigned long arg); | |
de8e5d74 | 119 | #ifdef CONFIG_KVM_COMPAT |
1dda606c AG |
120 | static long kvm_vcpu_compat_ioctl(struct file *file, unsigned int ioctl, |
121 | unsigned long arg); | |
7ddfd3e0 MZ |
122 | #define KVM_COMPAT(c) .compat_ioctl = (c) |
123 | #else | |
9cb09e7c MZ |
124 | /* |
125 | * For architectures that don't implement a compat infrastructure, | |
126 | * adopt a double line of defense: | |
127 | * - Prevent a compat task from opening /dev/kvm | |
128 | * - If the open has been done by a 64bit task, and the KVM fd | |
129 | * passed to a compat task, let the ioctls fail. | |
130 | */ | |
7ddfd3e0 MZ |
131 | static long kvm_no_compat_ioctl(struct file *file, unsigned int ioctl, |
132 | unsigned long arg) { return -EINVAL; } | |
b9876e6d MZ |
133 | |
134 | static int kvm_no_compat_open(struct inode *inode, struct file *file) | |
135 | { | |
136 | return is_compat_task() ? -ENODEV : 0; | |
137 | } | |
138 | #define KVM_COMPAT(c) .compat_ioctl = kvm_no_compat_ioctl, \ | |
139 | .open = kvm_no_compat_open | |
1dda606c | 140 | #endif |
10474ae8 AG |
141 | static int hardware_enable_all(void); |
142 | static void hardware_disable_all(void); | |
bccf2150 | 143 | |
e93f8a0f | 144 | static void kvm_io_bus_destroy(struct kvm_io_bus *bus); |
7940876e | 145 | |
bc009e43 | 146 | static void mark_page_dirty_in_slot(struct kvm_memory_slot *memslot, gfn_t gfn); |
e93f8a0f | 147 | |
52480137 | 148 | __visible bool kvm_rebooting; |
b7c4145b | 149 | EXPORT_SYMBOL_GPL(kvm_rebooting); |
4ecac3fd | 150 | |
54dee993 MT |
151 | static bool largepages_enabled = true; |
152 | ||
286de8f6 CI |
153 | #define KVM_EVENT_CREATE_VM 0 |
154 | #define KVM_EVENT_DESTROY_VM 1 | |
155 | static void kvm_uevent_notify_change(unsigned int type, struct kvm *kvm); | |
156 | static unsigned long long kvm_createvm_count; | |
157 | static unsigned long long kvm_active_vms; | |
158 | ||
93065ac7 MH |
159 | __weak int kvm_arch_mmu_notifier_invalidate_range(struct kvm *kvm, |
160 | unsigned long start, unsigned long end, bool blockable) | |
b1394e74 | 161 | { |
93065ac7 | 162 | return 0; |
b1394e74 RK |
163 | } |
164 | ||
a78986aa SC |
165 | bool kvm_is_zone_device_pfn(kvm_pfn_t pfn) |
166 | { | |
167 | /* | |
168 | * The metadata used by is_zone_device_page() to determine whether or | |
169 | * not a page is ZONE_DEVICE is guaranteed to be valid if and only if | |
170 | * the device has been pinned, e.g. by get_user_pages(). WARN if the | |
171 | * page_count() is zero to help detect bad usage of this helper. | |
172 | */ | |
173 | if (!pfn_valid(pfn) || WARN_ON_ONCE(!page_count(pfn_to_page(pfn)))) | |
174 | return false; | |
175 | ||
176 | return is_zone_device_page(pfn_to_page(pfn)); | |
177 | } | |
178 | ||
ba049e93 | 179 | bool kvm_is_reserved_pfn(kvm_pfn_t pfn) |
cbff90a7 | 180 | { |
a78986aa SC |
181 | /* |
182 | * ZONE_DEVICE pages currently set PG_reserved, but from a refcounting | |
183 | * perspective they are "normal" pages, albeit with slightly different | |
184 | * usage rules. | |
185 | */ | |
11feeb49 | 186 | if (pfn_valid(pfn)) |
a78986aa SC |
187 | return PageReserved(pfn_to_page(pfn)) && |
188 | !kvm_is_zone_device_pfn(pfn); | |
cbff90a7 BAY |
189 | |
190 | return true; | |
191 | } | |
192 | ||
bccf2150 AK |
193 | /* |
194 | * Switches to specified vcpu, until a matching vcpu_put() | |
195 | */ | |
ec7660cc | 196 | void vcpu_load(struct kvm_vcpu *vcpu) |
6aa8b732 | 197 | { |
ec7660cc | 198 | int cpu = get_cpu(); |
15ad7146 | 199 | preempt_notifier_register(&vcpu->preempt_notifier); |
313a3dc7 | 200 | kvm_arch_vcpu_load(vcpu, cpu); |
15ad7146 | 201 | put_cpu(); |
6aa8b732 | 202 | } |
2f1fe811 | 203 | EXPORT_SYMBOL_GPL(vcpu_load); |
6aa8b732 | 204 | |
313a3dc7 | 205 | void vcpu_put(struct kvm_vcpu *vcpu) |
6aa8b732 | 206 | { |
15ad7146 | 207 | preempt_disable(); |
313a3dc7 | 208 | kvm_arch_vcpu_put(vcpu); |
15ad7146 AK |
209 | preempt_notifier_unregister(&vcpu->preempt_notifier); |
210 | preempt_enable(); | |
6aa8b732 | 211 | } |
2f1fe811 | 212 | EXPORT_SYMBOL_GPL(vcpu_put); |
6aa8b732 | 213 | |
7a97cec2 PB |
214 | /* TODO: merge with kvm_arch_vcpu_should_kick */ |
215 | static bool kvm_request_needs_ipi(struct kvm_vcpu *vcpu, unsigned req) | |
216 | { | |
217 | int mode = kvm_vcpu_exiting_guest_mode(vcpu); | |
218 | ||
219 | /* | |
220 | * We need to wait for the VCPU to reenable interrupts and get out of | |
221 | * READING_SHADOW_PAGE_TABLES mode. | |
222 | */ | |
223 | if (req & KVM_REQUEST_WAIT) | |
224 | return mode != OUTSIDE_GUEST_MODE; | |
225 | ||
226 | /* | |
227 | * Need to kick a running VCPU, but otherwise there is nothing to do. | |
228 | */ | |
229 | return mode == IN_GUEST_MODE; | |
230 | } | |
231 | ||
d9e368d6 AK |
232 | static void ack_flush(void *_completed) |
233 | { | |
d9e368d6 AK |
234 | } |
235 | ||
b49defe8 PB |
236 | static inline bool kvm_kick_many_cpus(const struct cpumask *cpus, bool wait) |
237 | { | |
238 | if (unlikely(!cpus)) | |
239 | cpus = cpu_online_mask; | |
240 | ||
241 | if (cpumask_empty(cpus)) | |
242 | return false; | |
243 | ||
244 | smp_call_function_many(cpus, ack_flush, NULL, wait); | |
245 | return true; | |
246 | } | |
247 | ||
7053df4e VK |
248 | bool kvm_make_vcpus_request_mask(struct kvm *kvm, unsigned int req, |
249 | unsigned long *vcpu_bitmap, cpumask_var_t tmp) | |
d9e368d6 | 250 | { |
597a5f55 | 251 | int i, cpu, me; |
d9e368d6 | 252 | struct kvm_vcpu *vcpu; |
7053df4e | 253 | bool called; |
6ef7a1bc | 254 | |
3cba4130 | 255 | me = get_cpu(); |
7053df4e | 256 | |
988a2cae | 257 | kvm_for_each_vcpu(i, vcpu, kvm) { |
a812297c | 258 | if (vcpu_bitmap && !test_bit(i, vcpu_bitmap)) |
7053df4e VK |
259 | continue; |
260 | ||
3cba4130 | 261 | kvm_make_request(req, vcpu); |
d9e368d6 | 262 | cpu = vcpu->cpu; |
6b7e2d09 | 263 | |
178f02ff RK |
264 | if (!(req & KVM_REQUEST_NO_WAKEUP) && kvm_vcpu_wake_up(vcpu)) |
265 | continue; | |
6c6e8360 | 266 | |
7053df4e | 267 | if (tmp != NULL && cpu != -1 && cpu != me && |
7a97cec2 | 268 | kvm_request_needs_ipi(vcpu, req)) |
7053df4e | 269 | __cpumask_set_cpu(cpu, tmp); |
49846896 | 270 | } |
7053df4e VK |
271 | |
272 | called = kvm_kick_many_cpus(tmp, !!(req & KVM_REQUEST_WAIT)); | |
3cba4130 | 273 | put_cpu(); |
7053df4e VK |
274 | |
275 | return called; | |
276 | } | |
277 | ||
278 | bool kvm_make_all_cpus_request(struct kvm *kvm, unsigned int req) | |
279 | { | |
280 | cpumask_var_t cpus; | |
281 | bool called; | |
7053df4e VK |
282 | |
283 | zalloc_cpumask_var(&cpus, GFP_ATOMIC); | |
284 | ||
a812297c | 285 | called = kvm_make_vcpus_request_mask(kvm, req, NULL, cpus); |
7053df4e | 286 | |
6ef7a1bc | 287 | free_cpumask_var(cpus); |
49846896 | 288 | return called; |
d9e368d6 AK |
289 | } |
290 | ||
a6d51016 | 291 | #ifndef CONFIG_HAVE_KVM_ARCH_TLB_FLUSH_ALL |
49846896 | 292 | void kvm_flush_remote_tlbs(struct kvm *kvm) |
2e53d63a | 293 | { |
4ae3cb3a LT |
294 | /* |
295 | * Read tlbs_dirty before setting KVM_REQ_TLB_FLUSH in | |
296 | * kvm_make_all_cpus_request. | |
297 | */ | |
298 | long dirty_count = smp_load_acquire(&kvm->tlbs_dirty); | |
299 | ||
300 | /* | |
301 | * We want to publish modifications to the page tables before reading | |
302 | * mode. Pairs with a memory barrier in arch-specific code. | |
303 | * - x86: smp_mb__after_srcu_read_unlock in vcpu_enter_guest | |
304 | * and smp_mb in walk_shadow_page_lockless_begin/end. | |
305 | * - powerpc: smp_mb in kvmppc_prepare_to_enter. | |
306 | * | |
307 | * There is already an smp_mb__after_atomic() before | |
308 | * kvm_make_all_cpus_request() reads vcpu->mode. We reuse that | |
309 | * barrier here. | |
310 | */ | |
b08660e5 TL |
311 | if (!kvm_arch_flush_remote_tlb(kvm) |
312 | || kvm_make_all_cpus_request(kvm, KVM_REQ_TLB_FLUSH)) | |
49846896 | 313 | ++kvm->stat.remote_tlb_flush; |
a086f6a1 | 314 | cmpxchg(&kvm->tlbs_dirty, dirty_count, 0); |
2e53d63a | 315 | } |
2ba9f0d8 | 316 | EXPORT_SYMBOL_GPL(kvm_flush_remote_tlbs); |
a6d51016 | 317 | #endif |
2e53d63a | 318 | |
49846896 RR |
319 | void kvm_reload_remote_mmus(struct kvm *kvm) |
320 | { | |
445b8236 | 321 | kvm_make_all_cpus_request(kvm, KVM_REQ_MMU_RELOAD); |
49846896 | 322 | } |
2e53d63a | 323 | |
aaba298c | 324 | static int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id) |
fb3f0f51 RR |
325 | { |
326 | struct page *page; | |
fb3f0f51 RR |
327 | |
328 | mutex_init(&vcpu->mutex); | |
329 | vcpu->cpu = -1; | |
fb3f0f51 RR |
330 | vcpu->kvm = kvm; |
331 | vcpu->vcpu_id = id; | |
34bb10b7 | 332 | vcpu->pid = NULL; |
8577370f | 333 | init_swait_queue_head(&vcpu->wq); |
af585b92 | 334 | kvm_async_pf_vcpu_init(vcpu); |
fb3f0f51 | 335 | |
bf9f6ac8 FW |
336 | vcpu->pre_pcpu = -1; |
337 | INIT_LIST_HEAD(&vcpu->blocked_vcpu_list); | |
338 | ||
fb3f0f51 | 339 | page = alloc_page(GFP_KERNEL | __GFP_ZERO); |
ddd259c9 SC |
340 | if (!page) |
341 | return -ENOMEM; | |
fb3f0f51 RR |
342 | vcpu->run = page_address(page); |
343 | ||
4c088493 R |
344 | kvm_vcpu_set_in_spin_loop(vcpu, false); |
345 | kvm_vcpu_set_dy_eligible(vcpu, false); | |
3a08a8f9 | 346 | vcpu->preempted = false; |
d73eb57b | 347 | vcpu->ready = false; |
d5c48deb | 348 | preempt_notifier_init(&vcpu->preempt_notifier, &kvm_preempt_ops); |
4c088493 | 349 | |
fb3f0f51 | 350 | return 0; |
fb3f0f51 | 351 | } |
fb3f0f51 | 352 | |
aaba298c | 353 | static void kvm_vcpu_uninit(struct kvm_vcpu *vcpu) |
fb3f0f51 | 354 | { |
0e4524a5 CB |
355 | /* |
356 | * no need for rcu_read_lock as VCPU_RUN is the only place that | |
357 | * will change the vcpu->pid pointer and on uninit all file | |
358 | * descriptors are already gone. | |
359 | */ | |
360 | put_pid(rcu_dereference_protected(vcpu->pid, 1)); | |
fb3f0f51 RR |
361 | free_page((unsigned long)vcpu->run); |
362 | } | |
fb3f0f51 | 363 | |
4543bdc0 SC |
364 | void kvm_vcpu_destroy(struct kvm_vcpu *vcpu) |
365 | { | |
366 | kvm_arch_vcpu_destroy(vcpu); | |
e529ef66 SC |
367 | |
368 | kvm_vcpu_uninit(vcpu); | |
369 | kmem_cache_free(kvm_vcpu_cache, vcpu); | |
4543bdc0 SC |
370 | } |
371 | EXPORT_SYMBOL_GPL(kvm_vcpu_destroy); | |
372 | ||
e930bffe AA |
373 | #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER) |
374 | static inline struct kvm *mmu_notifier_to_kvm(struct mmu_notifier *mn) | |
375 | { | |
376 | return container_of(mn, struct kvm, mmu_notifier); | |
377 | } | |
378 | ||
3da0dd43 IE |
379 | static void kvm_mmu_notifier_change_pte(struct mmu_notifier *mn, |
380 | struct mm_struct *mm, | |
381 | unsigned long address, | |
382 | pte_t pte) | |
383 | { | |
384 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
bc6678a3 | 385 | int idx; |
3da0dd43 | 386 | |
bc6678a3 | 387 | idx = srcu_read_lock(&kvm->srcu); |
3da0dd43 IE |
388 | spin_lock(&kvm->mmu_lock); |
389 | kvm->mmu_notifier_seq++; | |
0cf853c5 LT |
390 | |
391 | if (kvm_set_spte_hva(kvm, address, pte)) | |
392 | kvm_flush_remote_tlbs(kvm); | |
393 | ||
3da0dd43 | 394 | spin_unlock(&kvm->mmu_lock); |
bc6678a3 | 395 | srcu_read_unlock(&kvm->srcu, idx); |
3da0dd43 IE |
396 | } |
397 | ||
93065ac7 | 398 | static int kvm_mmu_notifier_invalidate_range_start(struct mmu_notifier *mn, |
5d6527a7 | 399 | const struct mmu_notifier_range *range) |
e930bffe AA |
400 | { |
401 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
bc6678a3 | 402 | int need_tlb_flush = 0, idx; |
93065ac7 | 403 | int ret; |
e930bffe | 404 | |
bc6678a3 | 405 | idx = srcu_read_lock(&kvm->srcu); |
e930bffe AA |
406 | spin_lock(&kvm->mmu_lock); |
407 | /* | |
408 | * The count increase must become visible at unlock time as no | |
409 | * spte can be established without taking the mmu_lock and | |
410 | * count is also read inside the mmu_lock critical section. | |
411 | */ | |
412 | kvm->mmu_notifier_count++; | |
5d6527a7 | 413 | need_tlb_flush = kvm_unmap_hva_range(kvm, range->start, range->end); |
a4ee1ca4 | 414 | need_tlb_flush |= kvm->tlbs_dirty; |
e930bffe AA |
415 | /* we've to flush the tlb before the pages can be freed */ |
416 | if (need_tlb_flush) | |
417 | kvm_flush_remote_tlbs(kvm); | |
565f3be2 TY |
418 | |
419 | spin_unlock(&kvm->mmu_lock); | |
b1394e74 | 420 | |
5d6527a7 | 421 | ret = kvm_arch_mmu_notifier_invalidate_range(kvm, range->start, |
dfcd6660 JG |
422 | range->end, |
423 | mmu_notifier_range_blockable(range)); | |
b1394e74 | 424 | |
565f3be2 | 425 | srcu_read_unlock(&kvm->srcu, idx); |
93065ac7 MH |
426 | |
427 | return ret; | |
e930bffe AA |
428 | } |
429 | ||
430 | static void kvm_mmu_notifier_invalidate_range_end(struct mmu_notifier *mn, | |
5d6527a7 | 431 | const struct mmu_notifier_range *range) |
e930bffe AA |
432 | { |
433 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
434 | ||
435 | spin_lock(&kvm->mmu_lock); | |
436 | /* | |
437 | * This sequence increase will notify the kvm page fault that | |
438 | * the page that is going to be mapped in the spte could have | |
439 | * been freed. | |
440 | */ | |
441 | kvm->mmu_notifier_seq++; | |
a355aa54 | 442 | smp_wmb(); |
e930bffe AA |
443 | /* |
444 | * The above sequence increase must be visible before the | |
a355aa54 PM |
445 | * below count decrease, which is ensured by the smp_wmb above |
446 | * in conjunction with the smp_rmb in mmu_notifier_retry(). | |
e930bffe AA |
447 | */ |
448 | kvm->mmu_notifier_count--; | |
449 | spin_unlock(&kvm->mmu_lock); | |
450 | ||
451 | BUG_ON(kvm->mmu_notifier_count < 0); | |
452 | } | |
453 | ||
454 | static int kvm_mmu_notifier_clear_flush_young(struct mmu_notifier *mn, | |
455 | struct mm_struct *mm, | |
57128468 ALC |
456 | unsigned long start, |
457 | unsigned long end) | |
e930bffe AA |
458 | { |
459 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
bc6678a3 | 460 | int young, idx; |
e930bffe | 461 | |
bc6678a3 | 462 | idx = srcu_read_lock(&kvm->srcu); |
e930bffe | 463 | spin_lock(&kvm->mmu_lock); |
e930bffe | 464 | |
57128468 | 465 | young = kvm_age_hva(kvm, start, end); |
e930bffe AA |
466 | if (young) |
467 | kvm_flush_remote_tlbs(kvm); | |
468 | ||
565f3be2 TY |
469 | spin_unlock(&kvm->mmu_lock); |
470 | srcu_read_unlock(&kvm->srcu, idx); | |
471 | ||
e930bffe AA |
472 | return young; |
473 | } | |
474 | ||
1d7715c6 VD |
475 | static int kvm_mmu_notifier_clear_young(struct mmu_notifier *mn, |
476 | struct mm_struct *mm, | |
477 | unsigned long start, | |
478 | unsigned long end) | |
479 | { | |
480 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
481 | int young, idx; | |
482 | ||
483 | idx = srcu_read_lock(&kvm->srcu); | |
484 | spin_lock(&kvm->mmu_lock); | |
485 | /* | |
486 | * Even though we do not flush TLB, this will still adversely | |
487 | * affect performance on pre-Haswell Intel EPT, where there is | |
488 | * no EPT Access Bit to clear so that we have to tear down EPT | |
489 | * tables instead. If we find this unacceptable, we can always | |
490 | * add a parameter to kvm_age_hva so that it effectively doesn't | |
491 | * do anything on clear_young. | |
492 | * | |
493 | * Also note that currently we never issue secondary TLB flushes | |
494 | * from clear_young, leaving this job up to the regular system | |
495 | * cadence. If we find this inaccurate, we might come up with a | |
496 | * more sophisticated heuristic later. | |
497 | */ | |
498 | young = kvm_age_hva(kvm, start, end); | |
499 | spin_unlock(&kvm->mmu_lock); | |
500 | srcu_read_unlock(&kvm->srcu, idx); | |
501 | ||
502 | return young; | |
503 | } | |
504 | ||
8ee53820 AA |
505 | static int kvm_mmu_notifier_test_young(struct mmu_notifier *mn, |
506 | struct mm_struct *mm, | |
507 | unsigned long address) | |
508 | { | |
509 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
510 | int young, idx; | |
511 | ||
512 | idx = srcu_read_lock(&kvm->srcu); | |
513 | spin_lock(&kvm->mmu_lock); | |
514 | young = kvm_test_age_hva(kvm, address); | |
515 | spin_unlock(&kvm->mmu_lock); | |
516 | srcu_read_unlock(&kvm->srcu, idx); | |
517 | ||
518 | return young; | |
519 | } | |
520 | ||
85db06e5 MT |
521 | static void kvm_mmu_notifier_release(struct mmu_notifier *mn, |
522 | struct mm_struct *mm) | |
523 | { | |
524 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
eda2beda LJ |
525 | int idx; |
526 | ||
527 | idx = srcu_read_lock(&kvm->srcu); | |
2df72e9b | 528 | kvm_arch_flush_shadow_all(kvm); |
eda2beda | 529 | srcu_read_unlock(&kvm->srcu, idx); |
85db06e5 MT |
530 | } |
531 | ||
e930bffe | 532 | static const struct mmu_notifier_ops kvm_mmu_notifier_ops = { |
e930bffe AA |
533 | .invalidate_range_start = kvm_mmu_notifier_invalidate_range_start, |
534 | .invalidate_range_end = kvm_mmu_notifier_invalidate_range_end, | |
535 | .clear_flush_young = kvm_mmu_notifier_clear_flush_young, | |
1d7715c6 | 536 | .clear_young = kvm_mmu_notifier_clear_young, |
8ee53820 | 537 | .test_young = kvm_mmu_notifier_test_young, |
3da0dd43 | 538 | .change_pte = kvm_mmu_notifier_change_pte, |
85db06e5 | 539 | .release = kvm_mmu_notifier_release, |
e930bffe | 540 | }; |
4c07b0a4 AK |
541 | |
542 | static int kvm_init_mmu_notifier(struct kvm *kvm) | |
543 | { | |
544 | kvm->mmu_notifier.ops = &kvm_mmu_notifier_ops; | |
545 | return mmu_notifier_register(&kvm->mmu_notifier, current->mm); | |
546 | } | |
547 | ||
548 | #else /* !(CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER) */ | |
549 | ||
550 | static int kvm_init_mmu_notifier(struct kvm *kvm) | |
551 | { | |
552 | return 0; | |
553 | } | |
554 | ||
e930bffe AA |
555 | #endif /* CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER */ |
556 | ||
a47d2b07 | 557 | static struct kvm_memslots *kvm_alloc_memslots(void) |
bf3e05bc XG |
558 | { |
559 | int i; | |
a47d2b07 | 560 | struct kvm_memslots *slots; |
bf3e05bc | 561 | |
b12ce36a | 562 | slots = kvzalloc(sizeof(struct kvm_memslots), GFP_KERNEL_ACCOUNT); |
a47d2b07 PB |
563 | if (!slots) |
564 | return NULL; | |
565 | ||
bf3e05bc | 566 | for (i = 0; i < KVM_MEM_SLOTS_NUM; i++) |
f85e2cb5 | 567 | slots->id_to_index[i] = slots->memslots[i].id = i; |
a47d2b07 PB |
568 | |
569 | return slots; | |
570 | } | |
571 | ||
572 | static void kvm_destroy_dirty_bitmap(struct kvm_memory_slot *memslot) | |
573 | { | |
574 | if (!memslot->dirty_bitmap) | |
575 | return; | |
576 | ||
577 | kvfree(memslot->dirty_bitmap); | |
578 | memslot->dirty_bitmap = NULL; | |
579 | } | |
580 | ||
581 | /* | |
582 | * Free any memory in @free but not in @dont. | |
583 | */ | |
584 | static void kvm_free_memslot(struct kvm *kvm, struct kvm_memory_slot *free, | |
585 | struct kvm_memory_slot *dont) | |
586 | { | |
587 | if (!dont || free->dirty_bitmap != dont->dirty_bitmap) | |
588 | kvm_destroy_dirty_bitmap(free); | |
589 | ||
590 | kvm_arch_free_memslot(kvm, free, dont); | |
591 | ||
592 | free->npages = 0; | |
593 | } | |
594 | ||
595 | static void kvm_free_memslots(struct kvm *kvm, struct kvm_memslots *slots) | |
596 | { | |
597 | struct kvm_memory_slot *memslot; | |
598 | ||
599 | if (!slots) | |
600 | return; | |
601 | ||
602 | kvm_for_each_memslot(memslot, slots) | |
603 | kvm_free_memslot(kvm, memslot, NULL); | |
604 | ||
605 | kvfree(slots); | |
bf3e05bc XG |
606 | } |
607 | ||
536a6f88 JF |
608 | static void kvm_destroy_vm_debugfs(struct kvm *kvm) |
609 | { | |
610 | int i; | |
611 | ||
612 | if (!kvm->debugfs_dentry) | |
613 | return; | |
614 | ||
615 | debugfs_remove_recursive(kvm->debugfs_dentry); | |
616 | ||
9d5a1dce LC |
617 | if (kvm->debugfs_stat_data) { |
618 | for (i = 0; i < kvm_debugfs_num_entries; i++) | |
619 | kfree(kvm->debugfs_stat_data[i]); | |
620 | kfree(kvm->debugfs_stat_data); | |
621 | } | |
536a6f88 JF |
622 | } |
623 | ||
624 | static int kvm_create_vm_debugfs(struct kvm *kvm, int fd) | |
625 | { | |
626 | char dir_name[ITOA_MAX_LEN * 2]; | |
627 | struct kvm_stat_data *stat_data; | |
628 | struct kvm_stats_debugfs_item *p; | |
629 | ||
630 | if (!debugfs_initialized()) | |
631 | return 0; | |
632 | ||
633 | snprintf(dir_name, sizeof(dir_name), "%d-%d", task_pid_nr(current), fd); | |
929f45e3 | 634 | kvm->debugfs_dentry = debugfs_create_dir(dir_name, kvm_debugfs_dir); |
536a6f88 JF |
635 | |
636 | kvm->debugfs_stat_data = kcalloc(kvm_debugfs_num_entries, | |
637 | sizeof(*kvm->debugfs_stat_data), | |
b12ce36a | 638 | GFP_KERNEL_ACCOUNT); |
536a6f88 JF |
639 | if (!kvm->debugfs_stat_data) |
640 | return -ENOMEM; | |
641 | ||
642 | for (p = debugfs_entries; p->name; p++) { | |
b12ce36a | 643 | stat_data = kzalloc(sizeof(*stat_data), GFP_KERNEL_ACCOUNT); |
536a6f88 JF |
644 | if (!stat_data) |
645 | return -ENOMEM; | |
646 | ||
647 | stat_data->kvm = kvm; | |
09cbcef6 | 648 | stat_data->dbgfs_item = p; |
536a6f88 | 649 | kvm->debugfs_stat_data[p - debugfs_entries] = stat_data; |
09cbcef6 MP |
650 | debugfs_create_file(p->name, KVM_DBGFS_GET_MODE(p), |
651 | kvm->debugfs_dentry, stat_data, | |
652 | &stat_fops_per_vm); | |
536a6f88 JF |
653 | } |
654 | return 0; | |
655 | } | |
656 | ||
1aa9b957 JS |
657 | /* |
658 | * Called after the VM is otherwise initialized, but just before adding it to | |
659 | * the vm_list. | |
660 | */ | |
661 | int __weak kvm_arch_post_init_vm(struct kvm *kvm) | |
662 | { | |
663 | return 0; | |
664 | } | |
665 | ||
666 | /* | |
667 | * Called just after removing the VM from the vm_list, but before doing any | |
668 | * other destruction. | |
669 | */ | |
670 | void __weak kvm_arch_pre_destroy_vm(struct kvm *kvm) | |
671 | { | |
672 | } | |
673 | ||
e08b9637 | 674 | static struct kvm *kvm_create_vm(unsigned long type) |
6aa8b732 | 675 | { |
d89f5eff | 676 | struct kvm *kvm = kvm_arch_alloc_vm(); |
9121923c JM |
677 | int r = -ENOMEM; |
678 | int i; | |
6aa8b732 | 679 | |
d89f5eff JK |
680 | if (!kvm) |
681 | return ERR_PTR(-ENOMEM); | |
682 | ||
e9ad4ec8 | 683 | spin_lock_init(&kvm->mmu_lock); |
f1f10076 | 684 | mmgrab(current->mm); |
e9ad4ec8 PB |
685 | kvm->mm = current->mm; |
686 | kvm_eventfd_init(kvm); | |
687 | mutex_init(&kvm->lock); | |
688 | mutex_init(&kvm->irq_lock); | |
689 | mutex_init(&kvm->slots_lock); | |
e9ad4ec8 PB |
690 | INIT_LIST_HEAD(&kvm->devices); |
691 | ||
1e702d9a AW |
692 | BUILD_BUG_ON(KVM_MEM_SLOTS_NUM > SHRT_MAX); |
693 | ||
8a44119a PB |
694 | if (init_srcu_struct(&kvm->srcu)) |
695 | goto out_err_no_srcu; | |
696 | if (init_srcu_struct(&kvm->irq_srcu)) | |
697 | goto out_err_no_irq_srcu; | |
698 | ||
e2d3fcaf | 699 | refcount_set(&kvm->users_count, 1); |
f481b069 | 700 | for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++) { |
4bd518f1 | 701 | struct kvm_memslots *slots = kvm_alloc_memslots(); |
9121923c | 702 | |
4bd518f1 | 703 | if (!slots) |
a97b0e77 | 704 | goto out_err_no_arch_destroy_vm; |
0e32958e | 705 | /* Generations must be different for each address space. */ |
164bf7e5 | 706 | slots->generation = i; |
4bd518f1 | 707 | rcu_assign_pointer(kvm->memslots[i], slots); |
f481b069 | 708 | } |
00f034a1 | 709 | |
e93f8a0f | 710 | for (i = 0; i < KVM_NR_BUSES; i++) { |
4a12f951 | 711 | rcu_assign_pointer(kvm->buses[i], |
b12ce36a | 712 | kzalloc(sizeof(struct kvm_io_bus), GFP_KERNEL_ACCOUNT)); |
57e7fbee | 713 | if (!kvm->buses[i]) |
a97b0e77 | 714 | goto out_err_no_arch_destroy_vm; |
e93f8a0f | 715 | } |
e930bffe | 716 | |
e08b9637 | 717 | r = kvm_arch_init_vm(kvm, type); |
d89f5eff | 718 | if (r) |
a97b0e77 | 719 | goto out_err_no_arch_destroy_vm; |
10474ae8 AG |
720 | |
721 | r = hardware_enable_all(); | |
722 | if (r) | |
719d93cd | 723 | goto out_err_no_disable; |
10474ae8 | 724 | |
c77dcacb | 725 | #ifdef CONFIG_HAVE_KVM_IRQFD |
136bdfee | 726 | INIT_HLIST_HEAD(&kvm->irq_ack_notifier_list); |
75858a84 | 727 | #endif |
6aa8b732 | 728 | |
74b5c5bf | 729 | r = kvm_init_mmu_notifier(kvm); |
1aa9b957 JS |
730 | if (r) |
731 | goto out_err_no_mmu_notifier; | |
732 | ||
733 | r = kvm_arch_post_init_vm(kvm); | |
74b5c5bf MW |
734 | if (r) |
735 | goto out_err; | |
736 | ||
0d9ce162 | 737 | mutex_lock(&kvm_lock); |
5e58cfe4 | 738 | list_add(&kvm->vm_list, &vm_list); |
0d9ce162 | 739 | mutex_unlock(&kvm_lock); |
d89f5eff | 740 | |
2ecd9d29 PZ |
741 | preempt_notifier_inc(); |
742 | ||
f17abe9a | 743 | return kvm; |
10474ae8 AG |
744 | |
745 | out_err: | |
1aa9b957 JS |
746 | #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER) |
747 | if (kvm->mmu_notifier.ops) | |
748 | mmu_notifier_unregister(&kvm->mmu_notifier, current->mm); | |
749 | #endif | |
750 | out_err_no_mmu_notifier: | |
10474ae8 | 751 | hardware_disable_all(); |
719d93cd | 752 | out_err_no_disable: |
a97b0e77 | 753 | kvm_arch_destroy_vm(kvm); |
a97b0e77 | 754 | out_err_no_arch_destroy_vm: |
e2d3fcaf | 755 | WARN_ON_ONCE(!refcount_dec_and_test(&kvm->users_count)); |
e93f8a0f | 756 | for (i = 0; i < KVM_NR_BUSES; i++) |
3898da94 | 757 | kfree(kvm_get_bus(kvm, i)); |
f481b069 | 758 | for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++) |
3898da94 | 759 | kvm_free_memslots(kvm, __kvm_memslots(kvm, i)); |
8a44119a PB |
760 | cleanup_srcu_struct(&kvm->irq_srcu); |
761 | out_err_no_irq_srcu: | |
762 | cleanup_srcu_struct(&kvm->srcu); | |
763 | out_err_no_srcu: | |
d89f5eff | 764 | kvm_arch_free_vm(kvm); |
e9ad4ec8 | 765 | mmdrop(current->mm); |
10474ae8 | 766 | return ERR_PTR(r); |
f17abe9a AK |
767 | } |
768 | ||
07f0a7bd SW |
769 | static void kvm_destroy_devices(struct kvm *kvm) |
770 | { | |
e6e3b5a6 | 771 | struct kvm_device *dev, *tmp; |
07f0a7bd | 772 | |
a28ebea2 CD |
773 | /* |
774 | * We do not need to take the kvm->lock here, because nobody else | |
775 | * has a reference to the struct kvm at this point and therefore | |
776 | * cannot access the devices list anyhow. | |
777 | */ | |
e6e3b5a6 GT |
778 | list_for_each_entry_safe(dev, tmp, &kvm->devices, vm_node) { |
779 | list_del(&dev->vm_node); | |
07f0a7bd SW |
780 | dev->ops->destroy(dev); |
781 | } | |
782 | } | |
783 | ||
f17abe9a AK |
784 | static void kvm_destroy_vm(struct kvm *kvm) |
785 | { | |
e93f8a0f | 786 | int i; |
6d4e4c4f AK |
787 | struct mm_struct *mm = kvm->mm; |
788 | ||
286de8f6 | 789 | kvm_uevent_notify_change(KVM_EVENT_DESTROY_VM, kvm); |
536a6f88 | 790 | kvm_destroy_vm_debugfs(kvm); |
ad8ba2cd | 791 | kvm_arch_sync_events(kvm); |
0d9ce162 | 792 | mutex_lock(&kvm_lock); |
133de902 | 793 | list_del(&kvm->vm_list); |
0d9ce162 | 794 | mutex_unlock(&kvm_lock); |
1aa9b957 JS |
795 | kvm_arch_pre_destroy_vm(kvm); |
796 | ||
399ec807 | 797 | kvm_free_irq_routing(kvm); |
df630b8c | 798 | for (i = 0; i < KVM_NR_BUSES; i++) { |
3898da94 | 799 | struct kvm_io_bus *bus = kvm_get_bus(kvm, i); |
4a12f951 | 800 | |
4a12f951 CB |
801 | if (bus) |
802 | kvm_io_bus_destroy(bus); | |
df630b8c PX |
803 | kvm->buses[i] = NULL; |
804 | } | |
980da6ce | 805 | kvm_coalesced_mmio_free(kvm); |
e930bffe AA |
806 | #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER) |
807 | mmu_notifier_unregister(&kvm->mmu_notifier, kvm->mm); | |
f00be0ca | 808 | #else |
2df72e9b | 809 | kvm_arch_flush_shadow_all(kvm); |
5f94c174 | 810 | #endif |
d19a9cd2 | 811 | kvm_arch_destroy_vm(kvm); |
07f0a7bd | 812 | kvm_destroy_devices(kvm); |
f481b069 | 813 | for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++) |
3898da94 | 814 | kvm_free_memslots(kvm, __kvm_memslots(kvm, i)); |
820b3fcd | 815 | cleanup_srcu_struct(&kvm->irq_srcu); |
d89f5eff JK |
816 | cleanup_srcu_struct(&kvm->srcu); |
817 | kvm_arch_free_vm(kvm); | |
2ecd9d29 | 818 | preempt_notifier_dec(); |
10474ae8 | 819 | hardware_disable_all(); |
6d4e4c4f | 820 | mmdrop(mm); |
f17abe9a AK |
821 | } |
822 | ||
d39f13b0 IE |
823 | void kvm_get_kvm(struct kvm *kvm) |
824 | { | |
e3736c3e | 825 | refcount_inc(&kvm->users_count); |
d39f13b0 IE |
826 | } |
827 | EXPORT_SYMBOL_GPL(kvm_get_kvm); | |
828 | ||
829 | void kvm_put_kvm(struct kvm *kvm) | |
830 | { | |
e3736c3e | 831 | if (refcount_dec_and_test(&kvm->users_count)) |
d39f13b0 IE |
832 | kvm_destroy_vm(kvm); |
833 | } | |
834 | EXPORT_SYMBOL_GPL(kvm_put_kvm); | |
835 | ||
149487bd SC |
836 | /* |
837 | * Used to put a reference that was taken on behalf of an object associated | |
838 | * with a user-visible file descriptor, e.g. a vcpu or device, if installation | |
839 | * of the new file descriptor fails and the reference cannot be transferred to | |
840 | * its final owner. In such cases, the caller is still actively using @kvm and | |
841 | * will fail miserably if the refcount unexpectedly hits zero. | |
842 | */ | |
843 | void kvm_put_kvm_no_destroy(struct kvm *kvm) | |
844 | { | |
845 | WARN_ON(refcount_dec_and_test(&kvm->users_count)); | |
846 | } | |
847 | EXPORT_SYMBOL_GPL(kvm_put_kvm_no_destroy); | |
d39f13b0 | 848 | |
f17abe9a AK |
849 | static int kvm_vm_release(struct inode *inode, struct file *filp) |
850 | { | |
851 | struct kvm *kvm = filp->private_data; | |
852 | ||
721eecbf GH |
853 | kvm_irqfd_release(kvm); |
854 | ||
d39f13b0 | 855 | kvm_put_kvm(kvm); |
6aa8b732 AK |
856 | return 0; |
857 | } | |
858 | ||
515a0127 TY |
859 | /* |
860 | * Allocation size is twice as large as the actual dirty bitmap size. | |
93474b25 | 861 | * See x86's kvm_vm_ioctl_get_dirty_log() why this is needed. |
515a0127 | 862 | */ |
a36a57b1 TY |
863 | static int kvm_create_dirty_bitmap(struct kvm_memory_slot *memslot) |
864 | { | |
515a0127 | 865 | unsigned long dirty_bytes = 2 * kvm_dirty_bitmap_bytes(memslot); |
a36a57b1 | 866 | |
b12ce36a | 867 | memslot->dirty_bitmap = kvzalloc(dirty_bytes, GFP_KERNEL_ACCOUNT); |
a36a57b1 TY |
868 | if (!memslot->dirty_bitmap) |
869 | return -ENOMEM; | |
870 | ||
a36a57b1 TY |
871 | return 0; |
872 | } | |
873 | ||
bf3e05bc | 874 | /* |
0e60b079 IM |
875 | * Insert memslot and re-sort memslots based on their GFN, |
876 | * so binary search could be used to lookup GFN. | |
877 | * Sorting algorithm takes advantage of having initially | |
878 | * sorted array and known changed memslot position. | |
bf3e05bc | 879 | */ |
5cc15027 | 880 | static void update_memslots(struct kvm_memslots *slots, |
31fc4f95 WY |
881 | struct kvm_memory_slot *new, |
882 | enum kvm_mr_change change) | |
bf3e05bc | 883 | { |
8593176c PB |
884 | int id = new->id; |
885 | int i = slots->id_to_index[id]; | |
063584d4 | 886 | struct kvm_memory_slot *mslots = slots->memslots; |
f85e2cb5 | 887 | |
8593176c | 888 | WARN_ON(mslots[i].id != id); |
31fc4f95 WY |
889 | switch (change) { |
890 | case KVM_MR_CREATE: | |
891 | slots->used_slots++; | |
892 | WARN_ON(mslots[i].npages || !new->npages); | |
893 | break; | |
894 | case KVM_MR_DELETE: | |
895 | slots->used_slots--; | |
896 | WARN_ON(new->npages || !mslots[i].npages); | |
897 | break; | |
898 | default: | |
899 | break; | |
9c1a5d38 | 900 | } |
0e60b079 | 901 | |
7f379cff | 902 | while (i < KVM_MEM_SLOTS_NUM - 1 && |
0e60b079 IM |
903 | new->base_gfn <= mslots[i + 1].base_gfn) { |
904 | if (!mslots[i + 1].npages) | |
905 | break; | |
7f379cff IM |
906 | mslots[i] = mslots[i + 1]; |
907 | slots->id_to_index[mslots[i].id] = i; | |
908 | i++; | |
909 | } | |
efbeec70 PB |
910 | |
911 | /* | |
912 | * The ">=" is needed when creating a slot with base_gfn == 0, | |
913 | * so that it moves before all those with base_gfn == npages == 0. | |
914 | * | |
915 | * On the other hand, if new->npages is zero, the above loop has | |
916 | * already left i pointing to the beginning of the empty part of | |
917 | * mslots, and the ">=" would move the hole backwards in this | |
918 | * case---which is wrong. So skip the loop when deleting a slot. | |
919 | */ | |
920 | if (new->npages) { | |
921 | while (i > 0 && | |
922 | new->base_gfn >= mslots[i - 1].base_gfn) { | |
923 | mslots[i] = mslots[i - 1]; | |
924 | slots->id_to_index[mslots[i].id] = i; | |
925 | i--; | |
926 | } | |
dbaff309 PB |
927 | } else |
928 | WARN_ON_ONCE(i != slots->used_slots); | |
f85e2cb5 | 929 | |
8593176c PB |
930 | mslots[i] = *new; |
931 | slots->id_to_index[mslots[i].id] = i; | |
bf3e05bc XG |
932 | } |
933 | ||
09170a49 | 934 | static int check_memory_region_flags(const struct kvm_userspace_memory_region *mem) |
a50d64d6 | 935 | { |
4d8b81ab XG |
936 | u32 valid_flags = KVM_MEM_LOG_DIRTY_PAGES; |
937 | ||
0f8a4de3 | 938 | #ifdef __KVM_HAVE_READONLY_MEM |
4d8b81ab XG |
939 | valid_flags |= KVM_MEM_READONLY; |
940 | #endif | |
941 | ||
942 | if (mem->flags & ~valid_flags) | |
a50d64d6 XG |
943 | return -EINVAL; |
944 | ||
945 | return 0; | |
946 | } | |
947 | ||
7ec4fb44 | 948 | static struct kvm_memslots *install_new_memslots(struct kvm *kvm, |
f481b069 | 949 | int as_id, struct kvm_memslots *slots) |
7ec4fb44 | 950 | { |
f481b069 | 951 | struct kvm_memslots *old_memslots = __kvm_memslots(kvm, as_id); |
361209e0 | 952 | u64 gen = old_memslots->generation; |
7ec4fb44 | 953 | |
361209e0 SC |
954 | WARN_ON(gen & KVM_MEMSLOT_GEN_UPDATE_IN_PROGRESS); |
955 | slots->generation = gen | KVM_MEMSLOT_GEN_UPDATE_IN_PROGRESS; | |
ee3d1570 | 956 | |
f481b069 | 957 | rcu_assign_pointer(kvm->memslots[as_id], slots); |
7ec4fb44 | 958 | synchronize_srcu_expedited(&kvm->srcu); |
e59dbe09 | 959 | |
ee3d1570 | 960 | /* |
361209e0 | 961 | * Increment the new memslot generation a second time, dropping the |
00116795 | 962 | * update in-progress flag and incrementing the generation based on |
361209e0 SC |
963 | * the number of address spaces. This provides a unique and easily |
964 | * identifiable generation number while the memslots are in flux. | |
965 | */ | |
966 | gen = slots->generation & ~KVM_MEMSLOT_GEN_UPDATE_IN_PROGRESS; | |
967 | ||
968 | /* | |
4bd518f1 PB |
969 | * Generations must be unique even across address spaces. We do not need |
970 | * a global counter for that, instead the generation space is evenly split | |
971 | * across address spaces. For example, with two address spaces, address | |
164bf7e5 SC |
972 | * space 0 will use generations 0, 2, 4, ... while address space 1 will |
973 | * use generations 1, 3, 5, ... | |
ee3d1570 | 974 | */ |
164bf7e5 | 975 | gen += KVM_ADDRESS_SPACE_NUM; |
ee3d1570 | 976 | |
15248258 | 977 | kvm_arch_memslots_updated(kvm, gen); |
ee3d1570 | 978 | |
15248258 | 979 | slots->generation = gen; |
e59dbe09 TY |
980 | |
981 | return old_memslots; | |
7ec4fb44 GN |
982 | } |
983 | ||
6aa8b732 AK |
984 | /* |
985 | * Allocate some memory and give it an address in the guest physical address | |
986 | * space. | |
987 | * | |
988 | * Discontiguous memory is allowed, mostly for framebuffers. | |
f78e0e2e | 989 | * |
02d5d55b | 990 | * Must be called holding kvm->slots_lock for write. |
6aa8b732 | 991 | */ |
f78e0e2e | 992 | int __kvm_set_memory_region(struct kvm *kvm, |
09170a49 | 993 | const struct kvm_userspace_memory_region *mem) |
6aa8b732 | 994 | { |
8234b22e | 995 | int r; |
6aa8b732 | 996 | gfn_t base_gfn; |
28bcb112 | 997 | unsigned long npages; |
a843fac2 | 998 | struct kvm_memory_slot *slot; |
6aa8b732 | 999 | struct kvm_memory_slot old, new; |
b7f69c55 | 1000 | struct kvm_memslots *slots = NULL, *old_memslots; |
f481b069 | 1001 | int as_id, id; |
f64c0398 | 1002 | enum kvm_mr_change change; |
6aa8b732 | 1003 | |
a50d64d6 XG |
1004 | r = check_memory_region_flags(mem); |
1005 | if (r) | |
1006 | goto out; | |
1007 | ||
6aa8b732 | 1008 | r = -EINVAL; |
f481b069 PB |
1009 | as_id = mem->slot >> 16; |
1010 | id = (u16)mem->slot; | |
1011 | ||
6aa8b732 AK |
1012 | /* General sanity checks */ |
1013 | if (mem->memory_size & (PAGE_SIZE - 1)) | |
1014 | goto out; | |
1015 | if (mem->guest_phys_addr & (PAGE_SIZE - 1)) | |
1016 | goto out; | |
fa3d315a | 1017 | /* We can read the guest memory with __xxx_user() later on. */ |
f481b069 | 1018 | if ((id < KVM_USER_MEM_SLOTS) && |
fa3d315a | 1019 | ((mem->userspace_addr & (PAGE_SIZE - 1)) || |
96d4f267 | 1020 | !access_ok((void __user *)(unsigned long)mem->userspace_addr, |
9e3bb6b6 | 1021 | mem->memory_size))) |
78749809 | 1022 | goto out; |
f481b069 | 1023 | if (as_id >= KVM_ADDRESS_SPACE_NUM || id >= KVM_MEM_SLOTS_NUM) |
6aa8b732 AK |
1024 | goto out; |
1025 | if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr) | |
1026 | goto out; | |
1027 | ||
f481b069 | 1028 | slot = id_to_memslot(__kvm_memslots(kvm, as_id), id); |
6aa8b732 AK |
1029 | base_gfn = mem->guest_phys_addr >> PAGE_SHIFT; |
1030 | npages = mem->memory_size >> PAGE_SHIFT; | |
1031 | ||
660c22c4 TY |
1032 | if (npages > KVM_MEM_MAX_NR_PAGES) |
1033 | goto out; | |
1034 | ||
a843fac2 | 1035 | new = old = *slot; |
6aa8b732 | 1036 | |
f481b069 | 1037 | new.id = id; |
6aa8b732 AK |
1038 | new.base_gfn = base_gfn; |
1039 | new.npages = npages; | |
1040 | new.flags = mem->flags; | |
1041 | ||
f64c0398 TY |
1042 | if (npages) { |
1043 | if (!old.npages) | |
1044 | change = KVM_MR_CREATE; | |
1045 | else { /* Modify an existing slot. */ | |
1046 | if ((mem->userspace_addr != old.userspace_addr) || | |
75d61fbc TY |
1047 | (npages != old.npages) || |
1048 | ((new.flags ^ old.flags) & KVM_MEM_READONLY)) | |
f64c0398 TY |
1049 | goto out; |
1050 | ||
1051 | if (base_gfn != old.base_gfn) | |
1052 | change = KVM_MR_MOVE; | |
1053 | else if (new.flags != old.flags) | |
1054 | change = KVM_MR_FLAGS_ONLY; | |
1055 | else { /* Nothing to change. */ | |
1056 | r = 0; | |
1057 | goto out; | |
1058 | } | |
1059 | } | |
09170a49 PB |
1060 | } else { |
1061 | if (!old.npages) | |
1062 | goto out; | |
1063 | ||
f64c0398 | 1064 | change = KVM_MR_DELETE; |
09170a49 PB |
1065 | new.base_gfn = 0; |
1066 | new.flags = 0; | |
1067 | } | |
6aa8b732 | 1068 | |
f64c0398 | 1069 | if ((change == KVM_MR_CREATE) || (change == KVM_MR_MOVE)) { |
0a706bee TY |
1070 | /* Check for overlaps */ |
1071 | r = -EEXIST; | |
f481b069 | 1072 | kvm_for_each_memslot(slot, __kvm_memslots(kvm, as_id)) { |
b28676bb | 1073 | if (slot->id == id) |
0a706bee TY |
1074 | continue; |
1075 | if (!((base_gfn + npages <= slot->base_gfn) || | |
1076 | (base_gfn >= slot->base_gfn + slot->npages))) | |
1077 | goto out; | |
1078 | } | |
6aa8b732 | 1079 | } |
6aa8b732 | 1080 | |
6aa8b732 AK |
1081 | /* Free page dirty bitmap if unneeded */ |
1082 | if (!(new.flags & KVM_MEM_LOG_DIRTY_PAGES)) | |
8b6d44c7 | 1083 | new.dirty_bitmap = NULL; |
6aa8b732 AK |
1084 | |
1085 | r = -ENOMEM; | |
f64c0398 | 1086 | if (change == KVM_MR_CREATE) { |
189a2f7b | 1087 | new.userspace_addr = mem->userspace_addr; |
d89cc617 | 1088 | |
5587027c | 1089 | if (kvm_arch_create_memslot(kvm, &new, npages)) |
db3fe4eb | 1090 | goto out_free; |
6aa8b732 | 1091 | } |
ec04b260 | 1092 | |
6aa8b732 AK |
1093 | /* Allocate page dirty bitmap if needed */ |
1094 | if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) { | |
a36a57b1 | 1095 | if (kvm_create_dirty_bitmap(&new) < 0) |
f78e0e2e | 1096 | goto out_free; |
6aa8b732 AK |
1097 | } |
1098 | ||
b12ce36a | 1099 | slots = kvzalloc(sizeof(struct kvm_memslots), GFP_KERNEL_ACCOUNT); |
f2a81036 PB |
1100 | if (!slots) |
1101 | goto out_free; | |
f481b069 | 1102 | memcpy(slots, __kvm_memslots(kvm, as_id), sizeof(struct kvm_memslots)); |
f2a81036 | 1103 | |
f64c0398 | 1104 | if ((change == KVM_MR_DELETE) || (change == KVM_MR_MOVE)) { |
f481b069 | 1105 | slot = id_to_memslot(slots, id); |
28a37544 XG |
1106 | slot->flags |= KVM_MEMSLOT_INVALID; |
1107 | ||
f481b069 | 1108 | old_memslots = install_new_memslots(kvm, as_id, slots); |
bc6678a3 | 1109 | |
12d6e753 MT |
1110 | /* From this point no new shadow pages pointing to a deleted, |
1111 | * or moved, memslot will be created. | |
bc6678a3 MT |
1112 | * |
1113 | * validation of sp->gfn happens in: | |
b7d409de | 1114 | * - gfn_to_hva (kvm_read_guest, gfn_to_pfn) |
668effb6 | 1115 | * - kvm_is_visible_gfn (mmu_check_root) |
bc6678a3 | 1116 | */ |
2df72e9b | 1117 | kvm_arch_flush_shadow_memslot(kvm, slot); |
f2a81036 PB |
1118 | |
1119 | /* | |
1120 | * We can re-use the old_memslots from above, the only difference | |
1121 | * from the currently installed memslots is the invalid flag. This | |
1122 | * will get overwritten by update_memslots anyway. | |
1123 | */ | |
b7f69c55 | 1124 | slots = old_memslots; |
bc6678a3 | 1125 | } |
34d4cb8f | 1126 | |
7b6195a9 | 1127 | r = kvm_arch_prepare_memory_region(kvm, &new, mem, change); |
f7784b8e | 1128 | if (r) |
b7f69c55 | 1129 | goto out_slots; |
f7784b8e | 1130 | |
a47d2b07 | 1131 | /* actual memory is freed via old in kvm_free_memslot below */ |
f64c0398 | 1132 | if (change == KVM_MR_DELETE) { |
bc6678a3 | 1133 | new.dirty_bitmap = NULL; |
db3fe4eb | 1134 | memset(&new.arch, 0, sizeof(new.arch)); |
bc6678a3 MT |
1135 | } |
1136 | ||
31fc4f95 | 1137 | update_memslots(slots, &new, change); |
f481b069 | 1138 | old_memslots = install_new_memslots(kvm, as_id, slots); |
3ad82a7e | 1139 | |
f36f3f28 | 1140 | kvm_arch_commit_memory_region(kvm, mem, &old, &new, change); |
82ce2c96 | 1141 | |
a47d2b07 | 1142 | kvm_free_memslot(kvm, &old, &new); |
74496134 | 1143 | kvfree(old_memslots); |
6aa8b732 AK |
1144 | return 0; |
1145 | ||
e40f193f | 1146 | out_slots: |
74496134 | 1147 | kvfree(slots); |
f78e0e2e | 1148 | out_free: |
a47d2b07 | 1149 | kvm_free_memslot(kvm, &new, &old); |
6aa8b732 AK |
1150 | out: |
1151 | return r; | |
210c7c4d | 1152 | } |
f78e0e2e SY |
1153 | EXPORT_SYMBOL_GPL(__kvm_set_memory_region); |
1154 | ||
1155 | int kvm_set_memory_region(struct kvm *kvm, | |
09170a49 | 1156 | const struct kvm_userspace_memory_region *mem) |
f78e0e2e SY |
1157 | { |
1158 | int r; | |
1159 | ||
79fac95e | 1160 | mutex_lock(&kvm->slots_lock); |
47ae31e2 | 1161 | r = __kvm_set_memory_region(kvm, mem); |
79fac95e | 1162 | mutex_unlock(&kvm->slots_lock); |
f78e0e2e SY |
1163 | return r; |
1164 | } | |
210c7c4d IE |
1165 | EXPORT_SYMBOL_GPL(kvm_set_memory_region); |
1166 | ||
7940876e SH |
1167 | static int kvm_vm_ioctl_set_memory_region(struct kvm *kvm, |
1168 | struct kvm_userspace_memory_region *mem) | |
210c7c4d | 1169 | { |
f481b069 | 1170 | if ((u16)mem->slot >= KVM_USER_MEM_SLOTS) |
e0d62c7f | 1171 | return -EINVAL; |
09170a49 | 1172 | |
47ae31e2 | 1173 | return kvm_set_memory_region(kvm, mem); |
6aa8b732 AK |
1174 | } |
1175 | ||
5bb064dc ZX |
1176 | int kvm_get_dirty_log(struct kvm *kvm, |
1177 | struct kvm_dirty_log *log, int *is_dirty) | |
6aa8b732 | 1178 | { |
9f6b8029 | 1179 | struct kvm_memslots *slots; |
6aa8b732 | 1180 | struct kvm_memory_slot *memslot; |
843574a3 | 1181 | int i, as_id, id; |
87bf6e7d | 1182 | unsigned long n; |
6aa8b732 AK |
1183 | unsigned long any = 0; |
1184 | ||
f481b069 PB |
1185 | as_id = log->slot >> 16; |
1186 | id = (u16)log->slot; | |
1187 | if (as_id >= KVM_ADDRESS_SPACE_NUM || id >= KVM_USER_MEM_SLOTS) | |
843574a3 | 1188 | return -EINVAL; |
6aa8b732 | 1189 | |
f481b069 PB |
1190 | slots = __kvm_memslots(kvm, as_id); |
1191 | memslot = id_to_memslot(slots, id); | |
6aa8b732 | 1192 | if (!memslot->dirty_bitmap) |
843574a3 | 1193 | return -ENOENT; |
6aa8b732 | 1194 | |
87bf6e7d | 1195 | n = kvm_dirty_bitmap_bytes(memslot); |
6aa8b732 | 1196 | |
cd1a4a98 | 1197 | for (i = 0; !any && i < n/sizeof(long); ++i) |
6aa8b732 AK |
1198 | any = memslot->dirty_bitmap[i]; |
1199 | ||
6aa8b732 | 1200 | if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n)) |
843574a3 | 1201 | return -EFAULT; |
6aa8b732 | 1202 | |
5bb064dc ZX |
1203 | if (any) |
1204 | *is_dirty = 1; | |
843574a3 | 1205 | return 0; |
6aa8b732 | 1206 | } |
2ba9f0d8 | 1207 | EXPORT_SYMBOL_GPL(kvm_get_dirty_log); |
6aa8b732 | 1208 | |
ba0513b5 MS |
1209 | #ifdef CONFIG_KVM_GENERIC_DIRTYLOG_READ_PROTECT |
1210 | /** | |
b8b00220 | 1211 | * kvm_get_dirty_log_protect - get a snapshot of dirty pages |
2a31b9db | 1212 | * and reenable dirty page tracking for the corresponding pages. |
ba0513b5 MS |
1213 | * @kvm: pointer to kvm instance |
1214 | * @log: slot id and address to which we copy the log | |
b8b00220 | 1215 | * @flush: true if TLB flush is needed by caller |
ba0513b5 MS |
1216 | * |
1217 | * We need to keep it in mind that VCPU threads can write to the bitmap | |
1218 | * concurrently. So, to avoid losing track of dirty pages we keep the | |
1219 | * following order: | |
1220 | * | |
1221 | * 1. Take a snapshot of the bit and clear it if needed. | |
1222 | * 2. Write protect the corresponding page. | |
1223 | * 3. Copy the snapshot to the userspace. | |
1224 | * 4. Upon return caller flushes TLB's if needed. | |
1225 | * | |
1226 | * Between 2 and 4, the guest may write to the page using the remaining TLB | |
1227 | * entry. This is not a problem because the page is reported dirty using | |
1228 | * the snapshot taken before and step 4 ensures that writes done after | |
1229 | * exiting to userspace will be logged for the next call. | |
1230 | * | |
1231 | */ | |
1232 | int kvm_get_dirty_log_protect(struct kvm *kvm, | |
8fe65a82 | 1233 | struct kvm_dirty_log *log, bool *flush) |
ba0513b5 | 1234 | { |
9f6b8029 | 1235 | struct kvm_memslots *slots; |
ba0513b5 | 1236 | struct kvm_memory_slot *memslot; |
58d6db34 | 1237 | int i, as_id, id; |
ba0513b5 MS |
1238 | unsigned long n; |
1239 | unsigned long *dirty_bitmap; | |
1240 | unsigned long *dirty_bitmap_buffer; | |
1241 | ||
f481b069 PB |
1242 | as_id = log->slot >> 16; |
1243 | id = (u16)log->slot; | |
1244 | if (as_id >= KVM_ADDRESS_SPACE_NUM || id >= KVM_USER_MEM_SLOTS) | |
58d6db34 | 1245 | return -EINVAL; |
ba0513b5 | 1246 | |
f481b069 PB |
1247 | slots = __kvm_memslots(kvm, as_id); |
1248 | memslot = id_to_memslot(slots, id); | |
ba0513b5 MS |
1249 | |
1250 | dirty_bitmap = memslot->dirty_bitmap; | |
ba0513b5 | 1251 | if (!dirty_bitmap) |
58d6db34 | 1252 | return -ENOENT; |
ba0513b5 MS |
1253 | |
1254 | n = kvm_dirty_bitmap_bytes(memslot); | |
2a31b9db PB |
1255 | *flush = false; |
1256 | if (kvm->manual_dirty_log_protect) { | |
1257 | /* | |
1258 | * Unlike kvm_get_dirty_log, we always return false in *flush, | |
1259 | * because no flush is needed until KVM_CLEAR_DIRTY_LOG. There | |
1260 | * is some code duplication between this function and | |
1261 | * kvm_get_dirty_log, but hopefully all architecture | |
1262 | * transition to kvm_get_dirty_log_protect and kvm_get_dirty_log | |
1263 | * can be eliminated. | |
1264 | */ | |
1265 | dirty_bitmap_buffer = dirty_bitmap; | |
1266 | } else { | |
1267 | dirty_bitmap_buffer = kvm_second_dirty_bitmap(memslot); | |
1268 | memset(dirty_bitmap_buffer, 0, n); | |
ba0513b5 | 1269 | |
2a31b9db PB |
1270 | spin_lock(&kvm->mmu_lock); |
1271 | for (i = 0; i < n / sizeof(long); i++) { | |
1272 | unsigned long mask; | |
1273 | gfn_t offset; | |
ba0513b5 | 1274 | |
2a31b9db PB |
1275 | if (!dirty_bitmap[i]) |
1276 | continue; | |
1277 | ||
1278 | *flush = true; | |
1279 | mask = xchg(&dirty_bitmap[i], 0); | |
1280 | dirty_bitmap_buffer[i] = mask; | |
1281 | ||
a67794ca LT |
1282 | offset = i * BITS_PER_LONG; |
1283 | kvm_arch_mmu_enable_log_dirty_pt_masked(kvm, memslot, | |
1284 | offset, mask); | |
2a31b9db PB |
1285 | } |
1286 | spin_unlock(&kvm->mmu_lock); | |
1287 | } | |
1288 | ||
1289 | if (copy_to_user(log->dirty_bitmap, dirty_bitmap_buffer, n)) | |
1290 | return -EFAULT; | |
1291 | return 0; | |
1292 | } | |
1293 | EXPORT_SYMBOL_GPL(kvm_get_dirty_log_protect); | |
1294 | ||
1295 | /** | |
1296 | * kvm_clear_dirty_log_protect - clear dirty bits in the bitmap | |
1297 | * and reenable dirty page tracking for the corresponding pages. | |
1298 | * @kvm: pointer to kvm instance | |
1299 | * @log: slot id and address from which to fetch the bitmap of dirty pages | |
b8b00220 | 1300 | * @flush: true if TLB flush is needed by caller |
2a31b9db PB |
1301 | */ |
1302 | int kvm_clear_dirty_log_protect(struct kvm *kvm, | |
1303 | struct kvm_clear_dirty_log *log, bool *flush) | |
1304 | { | |
1305 | struct kvm_memslots *slots; | |
1306 | struct kvm_memory_slot *memslot; | |
98938aa8 | 1307 | int as_id, id; |
2a31b9db | 1308 | gfn_t offset; |
98938aa8 | 1309 | unsigned long i, n; |
2a31b9db PB |
1310 | unsigned long *dirty_bitmap; |
1311 | unsigned long *dirty_bitmap_buffer; | |
1312 | ||
1313 | as_id = log->slot >> 16; | |
1314 | id = (u16)log->slot; | |
1315 | if (as_id >= KVM_ADDRESS_SPACE_NUM || id >= KVM_USER_MEM_SLOTS) | |
1316 | return -EINVAL; | |
1317 | ||
76d58e0f | 1318 | if (log->first_page & 63) |
2a31b9db PB |
1319 | return -EINVAL; |
1320 | ||
1321 | slots = __kvm_memslots(kvm, as_id); | |
1322 | memslot = id_to_memslot(slots, id); | |
1323 | ||
1324 | dirty_bitmap = memslot->dirty_bitmap; | |
1325 | if (!dirty_bitmap) | |
1326 | return -ENOENT; | |
1327 | ||
4ddc9204 | 1328 | n = ALIGN(log->num_pages, BITS_PER_LONG) / 8; |
98938aa8 TB |
1329 | |
1330 | if (log->first_page > memslot->npages || | |
76d58e0f PB |
1331 | log->num_pages > memslot->npages - log->first_page || |
1332 | (log->num_pages < memslot->npages - log->first_page && (log->num_pages & 63))) | |
1333 | return -EINVAL; | |
98938aa8 | 1334 | |
8fe65a82 | 1335 | *flush = false; |
2a31b9db PB |
1336 | dirty_bitmap_buffer = kvm_second_dirty_bitmap(memslot); |
1337 | if (copy_from_user(dirty_bitmap_buffer, log->dirty_bitmap, n)) | |
1338 | return -EFAULT; | |
ba0513b5 | 1339 | |
2a31b9db | 1340 | spin_lock(&kvm->mmu_lock); |
53eac7a8 PX |
1341 | for (offset = log->first_page, i = offset / BITS_PER_LONG, |
1342 | n = DIV_ROUND_UP(log->num_pages, BITS_PER_LONG); n--; | |
2a31b9db PB |
1343 | i++, offset += BITS_PER_LONG) { |
1344 | unsigned long mask = *dirty_bitmap_buffer++; | |
1345 | atomic_long_t *p = (atomic_long_t *) &dirty_bitmap[i]; | |
1346 | if (!mask) | |
ba0513b5 MS |
1347 | continue; |
1348 | ||
2a31b9db | 1349 | mask &= atomic_long_fetch_andnot(mask, p); |
ba0513b5 | 1350 | |
2a31b9db PB |
1351 | /* |
1352 | * mask contains the bits that really have been cleared. This | |
1353 | * never includes any bits beyond the length of the memslot (if | |
1354 | * the length is not aligned to 64 pages), therefore it is not | |
1355 | * a problem if userspace sets them in log->dirty_bitmap. | |
1356 | */ | |
58d2930f | 1357 | if (mask) { |
2a31b9db | 1358 | *flush = true; |
58d2930f TY |
1359 | kvm_arch_mmu_enable_log_dirty_pt_masked(kvm, memslot, |
1360 | offset, mask); | |
1361 | } | |
ba0513b5 | 1362 | } |
ba0513b5 | 1363 | spin_unlock(&kvm->mmu_lock); |
2a31b9db | 1364 | |
58d6db34 | 1365 | return 0; |
ba0513b5 | 1366 | } |
2a31b9db | 1367 | EXPORT_SYMBOL_GPL(kvm_clear_dirty_log_protect); |
ba0513b5 MS |
1368 | #endif |
1369 | ||
db3fe4eb TY |
1370 | bool kvm_largepages_enabled(void) |
1371 | { | |
1372 | return largepages_enabled; | |
1373 | } | |
1374 | ||
54dee993 MT |
1375 | void kvm_disable_largepages(void) |
1376 | { | |
1377 | largepages_enabled = false; | |
1378 | } | |
1379 | EXPORT_SYMBOL_GPL(kvm_disable_largepages); | |
1380 | ||
49c7754c GN |
1381 | struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn) |
1382 | { | |
1383 | return __gfn_to_memslot(kvm_memslots(kvm), gfn); | |
1384 | } | |
a1f4d395 | 1385 | EXPORT_SYMBOL_GPL(gfn_to_memslot); |
6aa8b732 | 1386 | |
8e73485c PB |
1387 | struct kvm_memory_slot *kvm_vcpu_gfn_to_memslot(struct kvm_vcpu *vcpu, gfn_t gfn) |
1388 | { | |
1389 | return __gfn_to_memslot(kvm_vcpu_memslots(vcpu), gfn); | |
1390 | } | |
1391 | ||
33e94154 | 1392 | bool kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn) |
e0d62c7f | 1393 | { |
bf3e05bc | 1394 | struct kvm_memory_slot *memslot = gfn_to_memslot(kvm, gfn); |
e0d62c7f | 1395 | |
bbacc0c1 | 1396 | if (!memslot || memslot->id >= KVM_USER_MEM_SLOTS || |
bf3e05bc | 1397 | memslot->flags & KVM_MEMSLOT_INVALID) |
33e94154 | 1398 | return false; |
e0d62c7f | 1399 | |
33e94154 | 1400 | return true; |
e0d62c7f IE |
1401 | } |
1402 | EXPORT_SYMBOL_GPL(kvm_is_visible_gfn); | |
1403 | ||
8f0b1ab6 JR |
1404 | unsigned long kvm_host_page_size(struct kvm *kvm, gfn_t gfn) |
1405 | { | |
1406 | struct vm_area_struct *vma; | |
1407 | unsigned long addr, size; | |
1408 | ||
1409 | size = PAGE_SIZE; | |
1410 | ||
1411 | addr = gfn_to_hva(kvm, gfn); | |
1412 | if (kvm_is_error_hva(addr)) | |
1413 | return PAGE_SIZE; | |
1414 | ||
1415 | down_read(¤t->mm->mmap_sem); | |
1416 | vma = find_vma(current->mm, addr); | |
1417 | if (!vma) | |
1418 | goto out; | |
1419 | ||
1420 | size = vma_kernel_pagesize(vma); | |
1421 | ||
1422 | out: | |
1423 | up_read(¤t->mm->mmap_sem); | |
1424 | ||
1425 | return size; | |
1426 | } | |
1427 | ||
4d8b81ab XG |
1428 | static bool memslot_is_readonly(struct kvm_memory_slot *slot) |
1429 | { | |
1430 | return slot->flags & KVM_MEM_READONLY; | |
1431 | } | |
1432 | ||
4d8b81ab XG |
1433 | static unsigned long __gfn_to_hva_many(struct kvm_memory_slot *slot, gfn_t gfn, |
1434 | gfn_t *nr_pages, bool write) | |
539cb660 | 1435 | { |
bc6678a3 | 1436 | if (!slot || slot->flags & KVM_MEMSLOT_INVALID) |
ca3a490c | 1437 | return KVM_HVA_ERR_BAD; |
48987781 | 1438 | |
4d8b81ab XG |
1439 | if (memslot_is_readonly(slot) && write) |
1440 | return KVM_HVA_ERR_RO_BAD; | |
48987781 XG |
1441 | |
1442 | if (nr_pages) | |
1443 | *nr_pages = slot->npages - (gfn - slot->base_gfn); | |
1444 | ||
4d8b81ab | 1445 | return __gfn_to_hva_memslot(slot, gfn); |
539cb660 | 1446 | } |
48987781 | 1447 | |
4d8b81ab XG |
1448 | static unsigned long gfn_to_hva_many(struct kvm_memory_slot *slot, gfn_t gfn, |
1449 | gfn_t *nr_pages) | |
1450 | { | |
1451 | return __gfn_to_hva_many(slot, gfn, nr_pages, true); | |
539cb660 | 1452 | } |
48987781 | 1453 | |
4d8b81ab | 1454 | unsigned long gfn_to_hva_memslot(struct kvm_memory_slot *slot, |
7940876e | 1455 | gfn_t gfn) |
4d8b81ab XG |
1456 | { |
1457 | return gfn_to_hva_many(slot, gfn, NULL); | |
1458 | } | |
1459 | EXPORT_SYMBOL_GPL(gfn_to_hva_memslot); | |
1460 | ||
48987781 XG |
1461 | unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn) |
1462 | { | |
49c7754c | 1463 | return gfn_to_hva_many(gfn_to_memslot(kvm, gfn), gfn, NULL); |
48987781 | 1464 | } |
0d150298 | 1465 | EXPORT_SYMBOL_GPL(gfn_to_hva); |
539cb660 | 1466 | |
8e73485c PB |
1467 | unsigned long kvm_vcpu_gfn_to_hva(struct kvm_vcpu *vcpu, gfn_t gfn) |
1468 | { | |
1469 | return gfn_to_hva_many(kvm_vcpu_gfn_to_memslot(vcpu, gfn), gfn, NULL); | |
1470 | } | |
1471 | EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_hva); | |
1472 | ||
86ab8cff | 1473 | /* |
970c0d4b WY |
1474 | * Return the hva of a @gfn and the R/W attribute if possible. |
1475 | * | |
1476 | * @slot: the kvm_memory_slot which contains @gfn | |
1477 | * @gfn: the gfn to be translated | |
1478 | * @writable: used to return the read/write attribute of the @slot if the hva | |
1479 | * is valid and @writable is not NULL | |
86ab8cff | 1480 | */ |
64d83126 CD |
1481 | unsigned long gfn_to_hva_memslot_prot(struct kvm_memory_slot *slot, |
1482 | gfn_t gfn, bool *writable) | |
86ab8cff | 1483 | { |
a2ac07fe GN |
1484 | unsigned long hva = __gfn_to_hva_many(slot, gfn, NULL, false); |
1485 | ||
1486 | if (!kvm_is_error_hva(hva) && writable) | |
ba6a3541 PB |
1487 | *writable = !memslot_is_readonly(slot); |
1488 | ||
a2ac07fe | 1489 | return hva; |
86ab8cff XG |
1490 | } |
1491 | ||
64d83126 CD |
1492 | unsigned long gfn_to_hva_prot(struct kvm *kvm, gfn_t gfn, bool *writable) |
1493 | { | |
1494 | struct kvm_memory_slot *slot = gfn_to_memslot(kvm, gfn); | |
1495 | ||
1496 | return gfn_to_hva_memslot_prot(slot, gfn, writable); | |
1497 | } | |
1498 | ||
8e73485c PB |
1499 | unsigned long kvm_vcpu_gfn_to_hva_prot(struct kvm_vcpu *vcpu, gfn_t gfn, bool *writable) |
1500 | { | |
1501 | struct kvm_memory_slot *slot = kvm_vcpu_gfn_to_memslot(vcpu, gfn); | |
1502 | ||
1503 | return gfn_to_hva_memslot_prot(slot, gfn, writable); | |
1504 | } | |
1505 | ||
fafc3dba HY |
1506 | static inline int check_user_page_hwpoison(unsigned long addr) |
1507 | { | |
0d731759 | 1508 | int rc, flags = FOLL_HWPOISON | FOLL_WRITE; |
fafc3dba | 1509 | |
0d731759 | 1510 | rc = get_user_pages(addr, 1, flags, NULL, NULL); |
fafc3dba HY |
1511 | return rc == -EHWPOISON; |
1512 | } | |
1513 | ||
2fc84311 | 1514 | /* |
b9b33da2 PB |
1515 | * The fast path to get the writable pfn which will be stored in @pfn, |
1516 | * true indicates success, otherwise false is returned. It's also the | |
311497e0 | 1517 | * only part that runs if we can in atomic context. |
2fc84311 | 1518 | */ |
b9b33da2 PB |
1519 | static bool hva_to_pfn_fast(unsigned long addr, bool write_fault, |
1520 | bool *writable, kvm_pfn_t *pfn) | |
954bbbc2 | 1521 | { |
8d4e1288 | 1522 | struct page *page[1]; |
2fc84311 | 1523 | int npages; |
954bbbc2 | 1524 | |
12ce13fe XG |
1525 | /* |
1526 | * Fast pin a writable pfn only if it is a write fault request | |
1527 | * or the caller allows to map a writable pfn for a read fault | |
1528 | * request. | |
1529 | */ | |
1530 | if (!(write_fault || writable)) | |
1531 | return false; | |
612819c3 | 1532 | |
2fc84311 XG |
1533 | npages = __get_user_pages_fast(addr, 1, 1, page); |
1534 | if (npages == 1) { | |
1535 | *pfn = page_to_pfn(page[0]); | |
612819c3 | 1536 | |
2fc84311 XG |
1537 | if (writable) |
1538 | *writable = true; | |
1539 | return true; | |
1540 | } | |
af585b92 | 1541 | |
2fc84311 XG |
1542 | return false; |
1543 | } | |
612819c3 | 1544 | |
2fc84311 XG |
1545 | /* |
1546 | * The slow path to get the pfn of the specified host virtual address, | |
1547 | * 1 indicates success, -errno is returned if error is detected. | |
1548 | */ | |
1549 | static int hva_to_pfn_slow(unsigned long addr, bool *async, bool write_fault, | |
ba049e93 | 1550 | bool *writable, kvm_pfn_t *pfn) |
2fc84311 | 1551 | { |
ce53053c AV |
1552 | unsigned int flags = FOLL_HWPOISON; |
1553 | struct page *page; | |
2fc84311 | 1554 | int npages = 0; |
612819c3 | 1555 | |
2fc84311 XG |
1556 | might_sleep(); |
1557 | ||
1558 | if (writable) | |
1559 | *writable = write_fault; | |
1560 | ||
ce53053c AV |
1561 | if (write_fault) |
1562 | flags |= FOLL_WRITE; | |
1563 | if (async) | |
1564 | flags |= FOLL_NOWAIT; | |
d4944b0e | 1565 | |
ce53053c | 1566 | npages = get_user_pages_unlocked(addr, 1, &page, flags); |
2fc84311 XG |
1567 | if (npages != 1) |
1568 | return npages; | |
1569 | ||
1570 | /* map read fault as writable if possible */ | |
12ce13fe | 1571 | if (unlikely(!write_fault) && writable) { |
ce53053c | 1572 | struct page *wpage; |
2fc84311 | 1573 | |
ce53053c | 1574 | if (__get_user_pages_fast(addr, 1, 1, &wpage) == 1) { |
2fc84311 | 1575 | *writable = true; |
ce53053c AV |
1576 | put_page(page); |
1577 | page = wpage; | |
612819c3 | 1578 | } |
887c08ac | 1579 | } |
ce53053c | 1580 | *pfn = page_to_pfn(page); |
2fc84311 XG |
1581 | return npages; |
1582 | } | |
539cb660 | 1583 | |
4d8b81ab XG |
1584 | static bool vma_is_valid(struct vm_area_struct *vma, bool write_fault) |
1585 | { | |
1586 | if (unlikely(!(vma->vm_flags & VM_READ))) | |
1587 | return false; | |
2e2e3738 | 1588 | |
4d8b81ab XG |
1589 | if (write_fault && (unlikely(!(vma->vm_flags & VM_WRITE)))) |
1590 | return false; | |
887c08ac | 1591 | |
4d8b81ab XG |
1592 | return true; |
1593 | } | |
bf998156 | 1594 | |
92176a8e PB |
1595 | static int hva_to_pfn_remapped(struct vm_area_struct *vma, |
1596 | unsigned long addr, bool *async, | |
a340b3e2 KA |
1597 | bool write_fault, bool *writable, |
1598 | kvm_pfn_t *p_pfn) | |
92176a8e | 1599 | { |
add6a0cd PB |
1600 | unsigned long pfn; |
1601 | int r; | |
1602 | ||
1603 | r = follow_pfn(vma, addr, &pfn); | |
1604 | if (r) { | |
1605 | /* | |
1606 | * get_user_pages fails for VM_IO and VM_PFNMAP vmas and does | |
1607 | * not call the fault handler, so do it here. | |
1608 | */ | |
1609 | bool unlocked = false; | |
1610 | r = fixup_user_fault(current, current->mm, addr, | |
1611 | (write_fault ? FAULT_FLAG_WRITE : 0), | |
1612 | &unlocked); | |
1613 | if (unlocked) | |
1614 | return -EAGAIN; | |
1615 | if (r) | |
1616 | return r; | |
1617 | ||
1618 | r = follow_pfn(vma, addr, &pfn); | |
1619 | if (r) | |
1620 | return r; | |
1621 | ||
1622 | } | |
1623 | ||
a340b3e2 KA |
1624 | if (writable) |
1625 | *writable = true; | |
add6a0cd PB |
1626 | |
1627 | /* | |
1628 | * Get a reference here because callers of *hva_to_pfn* and | |
1629 | * *gfn_to_pfn* ultimately call kvm_release_pfn_clean on the | |
1630 | * returned pfn. This is only needed if the VMA has VM_MIXEDMAP | |
1631 | * set, but the kvm_get_pfn/kvm_release_pfn_clean pair will | |
1632 | * simply do nothing for reserved pfns. | |
1633 | * | |
1634 | * Whoever called remap_pfn_range is also going to call e.g. | |
1635 | * unmap_mapping_range before the underlying pages are freed, | |
1636 | * causing a call to our MMU notifier. | |
1637 | */ | |
1638 | kvm_get_pfn(pfn); | |
1639 | ||
1640 | *p_pfn = pfn; | |
92176a8e PB |
1641 | return 0; |
1642 | } | |
1643 | ||
12ce13fe XG |
1644 | /* |
1645 | * Pin guest page in memory and return its pfn. | |
1646 | * @addr: host virtual address which maps memory to the guest | |
1647 | * @atomic: whether this function can sleep | |
1648 | * @async: whether this function need to wait IO complete if the | |
1649 | * host page is not in the memory | |
1650 | * @write_fault: whether we should get a writable host page | |
1651 | * @writable: whether it allows to map a writable host page for !@write_fault | |
1652 | * | |
1653 | * The function will map a writable host page for these two cases: | |
1654 | * 1): @write_fault = true | |
1655 | * 2): @write_fault = false && @writable, @writable will tell the caller | |
1656 | * whether the mapping is writable. | |
1657 | */ | |
ba049e93 | 1658 | static kvm_pfn_t hva_to_pfn(unsigned long addr, bool atomic, bool *async, |
2fc84311 XG |
1659 | bool write_fault, bool *writable) |
1660 | { | |
1661 | struct vm_area_struct *vma; | |
ba049e93 | 1662 | kvm_pfn_t pfn = 0; |
92176a8e | 1663 | int npages, r; |
2e2e3738 | 1664 | |
2fc84311 XG |
1665 | /* we can do it either atomically or asynchronously, not both */ |
1666 | BUG_ON(atomic && async); | |
8d4e1288 | 1667 | |
b9b33da2 | 1668 | if (hva_to_pfn_fast(addr, write_fault, writable, &pfn)) |
2fc84311 XG |
1669 | return pfn; |
1670 | ||
1671 | if (atomic) | |
1672 | return KVM_PFN_ERR_FAULT; | |
1673 | ||
1674 | npages = hva_to_pfn_slow(addr, async, write_fault, writable, &pfn); | |
1675 | if (npages == 1) | |
1676 | return pfn; | |
8d4e1288 | 1677 | |
2fc84311 XG |
1678 | down_read(¤t->mm->mmap_sem); |
1679 | if (npages == -EHWPOISON || | |
1680 | (!async && check_user_page_hwpoison(addr))) { | |
1681 | pfn = KVM_PFN_ERR_HWPOISON; | |
1682 | goto exit; | |
1683 | } | |
1684 | ||
add6a0cd | 1685 | retry: |
2fc84311 XG |
1686 | vma = find_vma_intersection(current->mm, addr, addr + 1); |
1687 | ||
1688 | if (vma == NULL) | |
1689 | pfn = KVM_PFN_ERR_FAULT; | |
92176a8e | 1690 | else if (vma->vm_flags & (VM_IO | VM_PFNMAP)) { |
a340b3e2 | 1691 | r = hva_to_pfn_remapped(vma, addr, async, write_fault, writable, &pfn); |
add6a0cd PB |
1692 | if (r == -EAGAIN) |
1693 | goto retry; | |
92176a8e PB |
1694 | if (r < 0) |
1695 | pfn = KVM_PFN_ERR_FAULT; | |
2fc84311 | 1696 | } else { |
4d8b81ab | 1697 | if (async && vma_is_valid(vma, write_fault)) |
2fc84311 XG |
1698 | *async = true; |
1699 | pfn = KVM_PFN_ERR_FAULT; | |
1700 | } | |
1701 | exit: | |
1702 | up_read(¤t->mm->mmap_sem); | |
2e2e3738 | 1703 | return pfn; |
35149e21 AL |
1704 | } |
1705 | ||
ba049e93 DW |
1706 | kvm_pfn_t __gfn_to_pfn_memslot(struct kvm_memory_slot *slot, gfn_t gfn, |
1707 | bool atomic, bool *async, bool write_fault, | |
1708 | bool *writable) | |
887c08ac | 1709 | { |
4d8b81ab XG |
1710 | unsigned long addr = __gfn_to_hva_many(slot, gfn, NULL, write_fault); |
1711 | ||
b2740d35 PB |
1712 | if (addr == KVM_HVA_ERR_RO_BAD) { |
1713 | if (writable) | |
1714 | *writable = false; | |
4d8b81ab | 1715 | return KVM_PFN_ERR_RO_FAULT; |
b2740d35 | 1716 | } |
4d8b81ab | 1717 | |
b2740d35 PB |
1718 | if (kvm_is_error_hva(addr)) { |
1719 | if (writable) | |
1720 | *writable = false; | |
81c52c56 | 1721 | return KVM_PFN_NOSLOT; |
b2740d35 | 1722 | } |
4d8b81ab XG |
1723 | |
1724 | /* Do not map writable pfn in the readonly memslot. */ | |
1725 | if (writable && memslot_is_readonly(slot)) { | |
1726 | *writable = false; | |
1727 | writable = NULL; | |
1728 | } | |
1729 | ||
1730 | return hva_to_pfn(addr, atomic, async, write_fault, | |
1731 | writable); | |
887c08ac | 1732 | } |
3520469d | 1733 | EXPORT_SYMBOL_GPL(__gfn_to_pfn_memslot); |
887c08ac | 1734 | |
ba049e93 | 1735 | kvm_pfn_t gfn_to_pfn_prot(struct kvm *kvm, gfn_t gfn, bool write_fault, |
612819c3 MT |
1736 | bool *writable) |
1737 | { | |
e37afc6e PB |
1738 | return __gfn_to_pfn_memslot(gfn_to_memslot(kvm, gfn), gfn, false, NULL, |
1739 | write_fault, writable); | |
612819c3 MT |
1740 | } |
1741 | EXPORT_SYMBOL_GPL(gfn_to_pfn_prot); | |
1742 | ||
ba049e93 | 1743 | kvm_pfn_t gfn_to_pfn_memslot(struct kvm_memory_slot *slot, gfn_t gfn) |
506f0d6f | 1744 | { |
4d8b81ab | 1745 | return __gfn_to_pfn_memslot(slot, gfn, false, NULL, true, NULL); |
506f0d6f | 1746 | } |
e37afc6e | 1747 | EXPORT_SYMBOL_GPL(gfn_to_pfn_memslot); |
506f0d6f | 1748 | |
ba049e93 | 1749 | kvm_pfn_t gfn_to_pfn_memslot_atomic(struct kvm_memory_slot *slot, gfn_t gfn) |
506f0d6f | 1750 | { |
4d8b81ab | 1751 | return __gfn_to_pfn_memslot(slot, gfn, true, NULL, true, NULL); |
506f0d6f | 1752 | } |
037d92dc | 1753 | EXPORT_SYMBOL_GPL(gfn_to_pfn_memslot_atomic); |
506f0d6f | 1754 | |
ba049e93 | 1755 | kvm_pfn_t gfn_to_pfn_atomic(struct kvm *kvm, gfn_t gfn) |
e37afc6e PB |
1756 | { |
1757 | return gfn_to_pfn_memslot_atomic(gfn_to_memslot(kvm, gfn), gfn); | |
1758 | } | |
1759 | EXPORT_SYMBOL_GPL(gfn_to_pfn_atomic); | |
1760 | ||
ba049e93 | 1761 | kvm_pfn_t kvm_vcpu_gfn_to_pfn_atomic(struct kvm_vcpu *vcpu, gfn_t gfn) |
8e73485c PB |
1762 | { |
1763 | return gfn_to_pfn_memslot_atomic(kvm_vcpu_gfn_to_memslot(vcpu, gfn), gfn); | |
1764 | } | |
1765 | EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_pfn_atomic); | |
1766 | ||
ba049e93 | 1767 | kvm_pfn_t gfn_to_pfn(struct kvm *kvm, gfn_t gfn) |
e37afc6e PB |
1768 | { |
1769 | return gfn_to_pfn_memslot(gfn_to_memslot(kvm, gfn), gfn); | |
1770 | } | |
1771 | EXPORT_SYMBOL_GPL(gfn_to_pfn); | |
1772 | ||
ba049e93 | 1773 | kvm_pfn_t kvm_vcpu_gfn_to_pfn(struct kvm_vcpu *vcpu, gfn_t gfn) |
8e73485c PB |
1774 | { |
1775 | return gfn_to_pfn_memslot(kvm_vcpu_gfn_to_memslot(vcpu, gfn), gfn); | |
1776 | } | |
1777 | EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_pfn); | |
1778 | ||
d9ef13c2 PB |
1779 | int gfn_to_page_many_atomic(struct kvm_memory_slot *slot, gfn_t gfn, |
1780 | struct page **pages, int nr_pages) | |
48987781 XG |
1781 | { |
1782 | unsigned long addr; | |
076b925d | 1783 | gfn_t entry = 0; |
48987781 | 1784 | |
d9ef13c2 | 1785 | addr = gfn_to_hva_many(slot, gfn, &entry); |
48987781 XG |
1786 | if (kvm_is_error_hva(addr)) |
1787 | return -1; | |
1788 | ||
1789 | if (entry < nr_pages) | |
1790 | return 0; | |
1791 | ||
1792 | return __get_user_pages_fast(addr, nr_pages, 1, pages); | |
1793 | } | |
1794 | EXPORT_SYMBOL_GPL(gfn_to_page_many_atomic); | |
1795 | ||
ba049e93 | 1796 | static struct page *kvm_pfn_to_page(kvm_pfn_t pfn) |
a2766325 | 1797 | { |
81c52c56 | 1798 | if (is_error_noslot_pfn(pfn)) |
cb9aaa30 | 1799 | return KVM_ERR_PTR_BAD_PAGE; |
a2766325 | 1800 | |
bf4bea8e | 1801 | if (kvm_is_reserved_pfn(pfn)) { |
cb9aaa30 | 1802 | WARN_ON(1); |
6cede2e6 | 1803 | return KVM_ERR_PTR_BAD_PAGE; |
cb9aaa30 | 1804 | } |
a2766325 XG |
1805 | |
1806 | return pfn_to_page(pfn); | |
1807 | } | |
1808 | ||
35149e21 AL |
1809 | struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn) |
1810 | { | |
ba049e93 | 1811 | kvm_pfn_t pfn; |
2e2e3738 AL |
1812 | |
1813 | pfn = gfn_to_pfn(kvm, gfn); | |
2e2e3738 | 1814 | |
a2766325 | 1815 | return kvm_pfn_to_page(pfn); |
954bbbc2 AK |
1816 | } |
1817 | EXPORT_SYMBOL_GPL(gfn_to_page); | |
1818 | ||
e45adf66 KA |
1819 | static int __kvm_map_gfn(struct kvm_memory_slot *slot, gfn_t gfn, |
1820 | struct kvm_host_map *map) | |
1821 | { | |
1822 | kvm_pfn_t pfn; | |
1823 | void *hva = NULL; | |
1824 | struct page *page = KVM_UNMAPPED_PAGE; | |
1825 | ||
1826 | if (!map) | |
1827 | return -EINVAL; | |
1828 | ||
1829 | pfn = gfn_to_pfn_memslot(slot, gfn); | |
1830 | if (is_error_noslot_pfn(pfn)) | |
1831 | return -EINVAL; | |
1832 | ||
1833 | if (pfn_valid(pfn)) { | |
1834 | page = pfn_to_page(pfn); | |
1835 | hva = kmap(page); | |
d30b214d | 1836 | #ifdef CONFIG_HAS_IOMEM |
e45adf66 KA |
1837 | } else { |
1838 | hva = memremap(pfn_to_hpa(pfn), PAGE_SIZE, MEMREMAP_WB); | |
d30b214d | 1839 | #endif |
e45adf66 KA |
1840 | } |
1841 | ||
1842 | if (!hva) | |
1843 | return -EFAULT; | |
1844 | ||
1845 | map->page = page; | |
1846 | map->hva = hva; | |
1847 | map->pfn = pfn; | |
1848 | map->gfn = gfn; | |
1849 | ||
1850 | return 0; | |
1851 | } | |
1852 | ||
1853 | int kvm_vcpu_map(struct kvm_vcpu *vcpu, gfn_t gfn, struct kvm_host_map *map) | |
1854 | { | |
1855 | return __kvm_map_gfn(kvm_vcpu_gfn_to_memslot(vcpu, gfn), gfn, map); | |
1856 | } | |
1857 | EXPORT_SYMBOL_GPL(kvm_vcpu_map); | |
1858 | ||
1859 | void kvm_vcpu_unmap(struct kvm_vcpu *vcpu, struct kvm_host_map *map, | |
1860 | bool dirty) | |
1861 | { | |
1862 | if (!map) | |
1863 | return; | |
1864 | ||
1865 | if (!map->hva) | |
1866 | return; | |
1867 | ||
b614c602 | 1868 | if (map->page != KVM_UNMAPPED_PAGE) |
e45adf66 | 1869 | kunmap(map->page); |
eb1f2f38 | 1870 | #ifdef CONFIG_HAS_IOMEM |
e45adf66 KA |
1871 | else |
1872 | memunmap(map->hva); | |
eb1f2f38 | 1873 | #endif |
e45adf66 KA |
1874 | |
1875 | if (dirty) { | |
1876 | kvm_vcpu_mark_page_dirty(vcpu, map->gfn); | |
1877 | kvm_release_pfn_dirty(map->pfn); | |
1878 | } else { | |
1879 | kvm_release_pfn_clean(map->pfn); | |
1880 | } | |
1881 | ||
1882 | map->hva = NULL; | |
1883 | map->page = NULL; | |
1884 | } | |
1885 | EXPORT_SYMBOL_GPL(kvm_vcpu_unmap); | |
1886 | ||
8e73485c PB |
1887 | struct page *kvm_vcpu_gfn_to_page(struct kvm_vcpu *vcpu, gfn_t gfn) |
1888 | { | |
ba049e93 | 1889 | kvm_pfn_t pfn; |
8e73485c PB |
1890 | |
1891 | pfn = kvm_vcpu_gfn_to_pfn(vcpu, gfn); | |
1892 | ||
1893 | return kvm_pfn_to_page(pfn); | |
1894 | } | |
1895 | EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_page); | |
1896 | ||
b4231d61 IE |
1897 | void kvm_release_page_clean(struct page *page) |
1898 | { | |
32cad84f XG |
1899 | WARN_ON(is_error_page(page)); |
1900 | ||
35149e21 | 1901 | kvm_release_pfn_clean(page_to_pfn(page)); |
b4231d61 IE |
1902 | } |
1903 | EXPORT_SYMBOL_GPL(kvm_release_page_clean); | |
1904 | ||
ba049e93 | 1905 | void kvm_release_pfn_clean(kvm_pfn_t pfn) |
35149e21 | 1906 | { |
bf4bea8e | 1907 | if (!is_error_noslot_pfn(pfn) && !kvm_is_reserved_pfn(pfn)) |
2e2e3738 | 1908 | put_page(pfn_to_page(pfn)); |
35149e21 AL |
1909 | } |
1910 | EXPORT_SYMBOL_GPL(kvm_release_pfn_clean); | |
1911 | ||
b4231d61 | 1912 | void kvm_release_page_dirty(struct page *page) |
8a7ae055 | 1913 | { |
a2766325 XG |
1914 | WARN_ON(is_error_page(page)); |
1915 | ||
35149e21 AL |
1916 | kvm_release_pfn_dirty(page_to_pfn(page)); |
1917 | } | |
1918 | EXPORT_SYMBOL_GPL(kvm_release_page_dirty); | |
1919 | ||
f7a6509f | 1920 | void kvm_release_pfn_dirty(kvm_pfn_t pfn) |
35149e21 AL |
1921 | { |
1922 | kvm_set_pfn_dirty(pfn); | |
1923 | kvm_release_pfn_clean(pfn); | |
1924 | } | |
f7a6509f | 1925 | EXPORT_SYMBOL_GPL(kvm_release_pfn_dirty); |
35149e21 | 1926 | |
ba049e93 | 1927 | void kvm_set_pfn_dirty(kvm_pfn_t pfn) |
35149e21 | 1928 | { |
d29c03a5 ML |
1929 | if (!kvm_is_reserved_pfn(pfn) && !kvm_is_zone_device_pfn(pfn)) |
1930 | SetPageDirty(pfn_to_page(pfn)); | |
8a7ae055 | 1931 | } |
35149e21 AL |
1932 | EXPORT_SYMBOL_GPL(kvm_set_pfn_dirty); |
1933 | ||
ba049e93 | 1934 | void kvm_set_pfn_accessed(kvm_pfn_t pfn) |
35149e21 | 1935 | { |
a78986aa | 1936 | if (!kvm_is_reserved_pfn(pfn) && !kvm_is_zone_device_pfn(pfn)) |
2e2e3738 | 1937 | mark_page_accessed(pfn_to_page(pfn)); |
35149e21 AL |
1938 | } |
1939 | EXPORT_SYMBOL_GPL(kvm_set_pfn_accessed); | |
1940 | ||
ba049e93 | 1941 | void kvm_get_pfn(kvm_pfn_t pfn) |
35149e21 | 1942 | { |
bf4bea8e | 1943 | if (!kvm_is_reserved_pfn(pfn)) |
2e2e3738 | 1944 | get_page(pfn_to_page(pfn)); |
35149e21 AL |
1945 | } |
1946 | EXPORT_SYMBOL_GPL(kvm_get_pfn); | |
8a7ae055 | 1947 | |
195aefde IE |
1948 | static int next_segment(unsigned long len, int offset) |
1949 | { | |
1950 | if (len > PAGE_SIZE - offset) | |
1951 | return PAGE_SIZE - offset; | |
1952 | else | |
1953 | return len; | |
1954 | } | |
1955 | ||
8e73485c PB |
1956 | static int __kvm_read_guest_page(struct kvm_memory_slot *slot, gfn_t gfn, |
1957 | void *data, int offset, int len) | |
195aefde | 1958 | { |
e0506bcb IE |
1959 | int r; |
1960 | unsigned long addr; | |
195aefde | 1961 | |
8e73485c | 1962 | addr = gfn_to_hva_memslot_prot(slot, gfn, NULL); |
e0506bcb IE |
1963 | if (kvm_is_error_hva(addr)) |
1964 | return -EFAULT; | |
3180a7fc | 1965 | r = __copy_from_user(data, (void __user *)addr + offset, len); |
e0506bcb | 1966 | if (r) |
195aefde | 1967 | return -EFAULT; |
195aefde IE |
1968 | return 0; |
1969 | } | |
8e73485c PB |
1970 | |
1971 | int kvm_read_guest_page(struct kvm *kvm, gfn_t gfn, void *data, int offset, | |
1972 | int len) | |
1973 | { | |
1974 | struct kvm_memory_slot *slot = gfn_to_memslot(kvm, gfn); | |
1975 | ||
1976 | return __kvm_read_guest_page(slot, gfn, data, offset, len); | |
1977 | } | |
195aefde IE |
1978 | EXPORT_SYMBOL_GPL(kvm_read_guest_page); |
1979 | ||
8e73485c PB |
1980 | int kvm_vcpu_read_guest_page(struct kvm_vcpu *vcpu, gfn_t gfn, void *data, |
1981 | int offset, int len) | |
1982 | { | |
1983 | struct kvm_memory_slot *slot = kvm_vcpu_gfn_to_memslot(vcpu, gfn); | |
1984 | ||
1985 | return __kvm_read_guest_page(slot, gfn, data, offset, len); | |
1986 | } | |
1987 | EXPORT_SYMBOL_GPL(kvm_vcpu_read_guest_page); | |
1988 | ||
195aefde IE |
1989 | int kvm_read_guest(struct kvm *kvm, gpa_t gpa, void *data, unsigned long len) |
1990 | { | |
1991 | gfn_t gfn = gpa >> PAGE_SHIFT; | |
1992 | int seg; | |
1993 | int offset = offset_in_page(gpa); | |
1994 | int ret; | |
1995 | ||
1996 | while ((seg = next_segment(len, offset)) != 0) { | |
1997 | ret = kvm_read_guest_page(kvm, gfn, data, offset, seg); | |
1998 | if (ret < 0) | |
1999 | return ret; | |
2000 | offset = 0; | |
2001 | len -= seg; | |
2002 | data += seg; | |
2003 | ++gfn; | |
2004 | } | |
2005 | return 0; | |
2006 | } | |
2007 | EXPORT_SYMBOL_GPL(kvm_read_guest); | |
2008 | ||
8e73485c | 2009 | int kvm_vcpu_read_guest(struct kvm_vcpu *vcpu, gpa_t gpa, void *data, unsigned long len) |
7ec54588 | 2010 | { |
7ec54588 | 2011 | gfn_t gfn = gpa >> PAGE_SHIFT; |
8e73485c | 2012 | int seg; |
7ec54588 | 2013 | int offset = offset_in_page(gpa); |
8e73485c PB |
2014 | int ret; |
2015 | ||
2016 | while ((seg = next_segment(len, offset)) != 0) { | |
2017 | ret = kvm_vcpu_read_guest_page(vcpu, gfn, data, offset, seg); | |
2018 | if (ret < 0) | |
2019 | return ret; | |
2020 | offset = 0; | |
2021 | len -= seg; | |
2022 | data += seg; | |
2023 | ++gfn; | |
2024 | } | |
2025 | return 0; | |
2026 | } | |
2027 | EXPORT_SYMBOL_GPL(kvm_vcpu_read_guest); | |
7ec54588 | 2028 | |
8e73485c PB |
2029 | static int __kvm_read_guest_atomic(struct kvm_memory_slot *slot, gfn_t gfn, |
2030 | void *data, int offset, unsigned long len) | |
2031 | { | |
2032 | int r; | |
2033 | unsigned long addr; | |
2034 | ||
2035 | addr = gfn_to_hva_memslot_prot(slot, gfn, NULL); | |
7ec54588 MT |
2036 | if (kvm_is_error_hva(addr)) |
2037 | return -EFAULT; | |
0aac03f0 | 2038 | pagefault_disable(); |
3180a7fc | 2039 | r = __copy_from_user_inatomic(data, (void __user *)addr + offset, len); |
0aac03f0 | 2040 | pagefault_enable(); |
7ec54588 MT |
2041 | if (r) |
2042 | return -EFAULT; | |
2043 | return 0; | |
2044 | } | |
7ec54588 | 2045 | |
8e73485c PB |
2046 | int kvm_read_guest_atomic(struct kvm *kvm, gpa_t gpa, void *data, |
2047 | unsigned long len) | |
2048 | { | |
2049 | gfn_t gfn = gpa >> PAGE_SHIFT; | |
2050 | struct kvm_memory_slot *slot = gfn_to_memslot(kvm, gfn); | |
2051 | int offset = offset_in_page(gpa); | |
2052 | ||
2053 | return __kvm_read_guest_atomic(slot, gfn, data, offset, len); | |
2054 | } | |
2055 | EXPORT_SYMBOL_GPL(kvm_read_guest_atomic); | |
2056 | ||
2057 | int kvm_vcpu_read_guest_atomic(struct kvm_vcpu *vcpu, gpa_t gpa, | |
2058 | void *data, unsigned long len) | |
2059 | { | |
2060 | gfn_t gfn = gpa >> PAGE_SHIFT; | |
2061 | struct kvm_memory_slot *slot = kvm_vcpu_gfn_to_memslot(vcpu, gfn); | |
2062 | int offset = offset_in_page(gpa); | |
2063 | ||
2064 | return __kvm_read_guest_atomic(slot, gfn, data, offset, len); | |
2065 | } | |
2066 | EXPORT_SYMBOL_GPL(kvm_vcpu_read_guest_atomic); | |
2067 | ||
2068 | static int __kvm_write_guest_page(struct kvm_memory_slot *memslot, gfn_t gfn, | |
2069 | const void *data, int offset, int len) | |
195aefde | 2070 | { |
e0506bcb IE |
2071 | int r; |
2072 | unsigned long addr; | |
195aefde | 2073 | |
251eb841 | 2074 | addr = gfn_to_hva_memslot(memslot, gfn); |
e0506bcb IE |
2075 | if (kvm_is_error_hva(addr)) |
2076 | return -EFAULT; | |
8b0cedff | 2077 | r = __copy_to_user((void __user *)addr + offset, data, len); |
e0506bcb | 2078 | if (r) |
195aefde | 2079 | return -EFAULT; |
bc009e43 | 2080 | mark_page_dirty_in_slot(memslot, gfn); |
195aefde IE |
2081 | return 0; |
2082 | } | |
8e73485c PB |
2083 | |
2084 | int kvm_write_guest_page(struct kvm *kvm, gfn_t gfn, | |
2085 | const void *data, int offset, int len) | |
2086 | { | |
2087 | struct kvm_memory_slot *slot = gfn_to_memslot(kvm, gfn); | |
2088 | ||
2089 | return __kvm_write_guest_page(slot, gfn, data, offset, len); | |
2090 | } | |
195aefde IE |
2091 | EXPORT_SYMBOL_GPL(kvm_write_guest_page); |
2092 | ||
8e73485c PB |
2093 | int kvm_vcpu_write_guest_page(struct kvm_vcpu *vcpu, gfn_t gfn, |
2094 | const void *data, int offset, int len) | |
2095 | { | |
2096 | struct kvm_memory_slot *slot = kvm_vcpu_gfn_to_memslot(vcpu, gfn); | |
2097 | ||
2098 | return __kvm_write_guest_page(slot, gfn, data, offset, len); | |
2099 | } | |
2100 | EXPORT_SYMBOL_GPL(kvm_vcpu_write_guest_page); | |
2101 | ||
195aefde IE |
2102 | int kvm_write_guest(struct kvm *kvm, gpa_t gpa, const void *data, |
2103 | unsigned long len) | |
2104 | { | |
2105 | gfn_t gfn = gpa >> PAGE_SHIFT; | |
2106 | int seg; | |
2107 | int offset = offset_in_page(gpa); | |
2108 | int ret; | |
2109 | ||
2110 | while ((seg = next_segment(len, offset)) != 0) { | |
2111 | ret = kvm_write_guest_page(kvm, gfn, data, offset, seg); | |
2112 | if (ret < 0) | |
2113 | return ret; | |
2114 | offset = 0; | |
2115 | len -= seg; | |
2116 | data += seg; | |
2117 | ++gfn; | |
2118 | } | |
2119 | return 0; | |
2120 | } | |
ff651cb6 | 2121 | EXPORT_SYMBOL_GPL(kvm_write_guest); |
195aefde | 2122 | |
8e73485c PB |
2123 | int kvm_vcpu_write_guest(struct kvm_vcpu *vcpu, gpa_t gpa, const void *data, |
2124 | unsigned long len) | |
2125 | { | |
2126 | gfn_t gfn = gpa >> PAGE_SHIFT; | |
2127 | int seg; | |
2128 | int offset = offset_in_page(gpa); | |
2129 | int ret; | |
2130 | ||
2131 | while ((seg = next_segment(len, offset)) != 0) { | |
2132 | ret = kvm_vcpu_write_guest_page(vcpu, gfn, data, offset, seg); | |
2133 | if (ret < 0) | |
2134 | return ret; | |
2135 | offset = 0; | |
2136 | len -= seg; | |
2137 | data += seg; | |
2138 | ++gfn; | |
2139 | } | |
2140 | return 0; | |
2141 | } | |
2142 | EXPORT_SYMBOL_GPL(kvm_vcpu_write_guest); | |
2143 | ||
5a2d4365 PB |
2144 | static int __kvm_gfn_to_hva_cache_init(struct kvm_memslots *slots, |
2145 | struct gfn_to_hva_cache *ghc, | |
2146 | gpa_t gpa, unsigned long len) | |
49c7754c | 2147 | { |
49c7754c | 2148 | int offset = offset_in_page(gpa); |
8f964525 AH |
2149 | gfn_t start_gfn = gpa >> PAGE_SHIFT; |
2150 | gfn_t end_gfn = (gpa + len - 1) >> PAGE_SHIFT; | |
2151 | gfn_t nr_pages_needed = end_gfn - start_gfn + 1; | |
2152 | gfn_t nr_pages_avail; | |
f1b9dd5e | 2153 | int r = start_gfn <= end_gfn ? 0 : -EINVAL; |
49c7754c GN |
2154 | |
2155 | ghc->gpa = gpa; | |
2156 | ghc->generation = slots->generation; | |
8f964525 | 2157 | ghc->len = len; |
f1b9dd5e JM |
2158 | ghc->hva = KVM_HVA_ERR_BAD; |
2159 | ||
2160 | /* | |
2161 | * If the requested region crosses two memslots, we still | |
2162 | * verify that the entire region is valid here. | |
2163 | */ | |
2164 | while (!r && start_gfn <= end_gfn) { | |
2165 | ghc->memslot = __gfn_to_memslot(slots, start_gfn); | |
2166 | ghc->hva = gfn_to_hva_many(ghc->memslot, start_gfn, | |
2167 | &nr_pages_avail); | |
2168 | if (kvm_is_error_hva(ghc->hva)) | |
2169 | r = -EFAULT; | |
2170 | start_gfn += nr_pages_avail; | |
2171 | } | |
2172 | ||
2173 | /* Use the slow path for cross page reads and writes. */ | |
2174 | if (!r && nr_pages_needed == 1) | |
49c7754c | 2175 | ghc->hva += offset; |
f1b9dd5e | 2176 | else |
8f964525 | 2177 | ghc->memslot = NULL; |
f1b9dd5e JM |
2178 | |
2179 | return r; | |
49c7754c | 2180 | } |
5a2d4365 | 2181 | |
4e335d9e | 2182 | int kvm_gfn_to_hva_cache_init(struct kvm *kvm, struct gfn_to_hva_cache *ghc, |
5a2d4365 PB |
2183 | gpa_t gpa, unsigned long len) |
2184 | { | |
4e335d9e | 2185 | struct kvm_memslots *slots = kvm_memslots(kvm); |
5a2d4365 PB |
2186 | return __kvm_gfn_to_hva_cache_init(slots, ghc, gpa, len); |
2187 | } | |
4e335d9e | 2188 | EXPORT_SYMBOL_GPL(kvm_gfn_to_hva_cache_init); |
49c7754c | 2189 | |
4e335d9e | 2190 | int kvm_write_guest_offset_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc, |
7a86dab8 JM |
2191 | void *data, unsigned int offset, |
2192 | unsigned long len) | |
49c7754c | 2193 | { |
4e335d9e | 2194 | struct kvm_memslots *slots = kvm_memslots(kvm); |
49c7754c | 2195 | int r; |
4ec6e863 | 2196 | gpa_t gpa = ghc->gpa + offset; |
49c7754c | 2197 | |
4ec6e863 | 2198 | BUG_ON(len + offset > ghc->len); |
8f964525 | 2199 | |
49c7754c | 2200 | if (slots->generation != ghc->generation) |
5a2d4365 | 2201 | __kvm_gfn_to_hva_cache_init(slots, ghc, ghc->gpa, ghc->len); |
8f964525 AH |
2202 | |
2203 | if (unlikely(!ghc->memslot)) | |
4e335d9e | 2204 | return kvm_write_guest(kvm, gpa, data, len); |
49c7754c GN |
2205 | |
2206 | if (kvm_is_error_hva(ghc->hva)) | |
2207 | return -EFAULT; | |
2208 | ||
4ec6e863 | 2209 | r = __copy_to_user((void __user *)ghc->hva + offset, data, len); |
49c7754c GN |
2210 | if (r) |
2211 | return -EFAULT; | |
4ec6e863 | 2212 | mark_page_dirty_in_slot(ghc->memslot, gpa >> PAGE_SHIFT); |
49c7754c GN |
2213 | |
2214 | return 0; | |
2215 | } | |
4e335d9e | 2216 | EXPORT_SYMBOL_GPL(kvm_write_guest_offset_cached); |
4ec6e863 | 2217 | |
4e335d9e PB |
2218 | int kvm_write_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc, |
2219 | void *data, unsigned long len) | |
4ec6e863 | 2220 | { |
4e335d9e | 2221 | return kvm_write_guest_offset_cached(kvm, ghc, data, 0, len); |
4ec6e863 | 2222 | } |
4e335d9e | 2223 | EXPORT_SYMBOL_GPL(kvm_write_guest_cached); |
49c7754c | 2224 | |
4e335d9e PB |
2225 | int kvm_read_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc, |
2226 | void *data, unsigned long len) | |
e03b644f | 2227 | { |
4e335d9e | 2228 | struct kvm_memslots *slots = kvm_memslots(kvm); |
e03b644f GN |
2229 | int r; |
2230 | ||
8f964525 AH |
2231 | BUG_ON(len > ghc->len); |
2232 | ||
e03b644f | 2233 | if (slots->generation != ghc->generation) |
5a2d4365 | 2234 | __kvm_gfn_to_hva_cache_init(slots, ghc, ghc->gpa, ghc->len); |
8f964525 AH |
2235 | |
2236 | if (unlikely(!ghc->memslot)) | |
4e335d9e | 2237 | return kvm_read_guest(kvm, ghc->gpa, data, len); |
e03b644f GN |
2238 | |
2239 | if (kvm_is_error_hva(ghc->hva)) | |
2240 | return -EFAULT; | |
2241 | ||
2242 | r = __copy_from_user(data, (void __user *)ghc->hva, len); | |
2243 | if (r) | |
2244 | return -EFAULT; | |
2245 | ||
2246 | return 0; | |
2247 | } | |
4e335d9e | 2248 | EXPORT_SYMBOL_GPL(kvm_read_guest_cached); |
e03b644f | 2249 | |
195aefde IE |
2250 | int kvm_clear_guest_page(struct kvm *kvm, gfn_t gfn, int offset, int len) |
2251 | { | |
8a3caa6d HC |
2252 | const void *zero_page = (const void *) __va(page_to_phys(ZERO_PAGE(0))); |
2253 | ||
2254 | return kvm_write_guest_page(kvm, gfn, zero_page, offset, len); | |
195aefde IE |
2255 | } |
2256 | EXPORT_SYMBOL_GPL(kvm_clear_guest_page); | |
2257 | ||
2258 | int kvm_clear_guest(struct kvm *kvm, gpa_t gpa, unsigned long len) | |
2259 | { | |
2260 | gfn_t gfn = gpa >> PAGE_SHIFT; | |
2261 | int seg; | |
2262 | int offset = offset_in_page(gpa); | |
2263 | int ret; | |
2264 | ||
bfda0e84 | 2265 | while ((seg = next_segment(len, offset)) != 0) { |
195aefde IE |
2266 | ret = kvm_clear_guest_page(kvm, gfn, offset, seg); |
2267 | if (ret < 0) | |
2268 | return ret; | |
2269 | offset = 0; | |
2270 | len -= seg; | |
2271 | ++gfn; | |
2272 | } | |
2273 | return 0; | |
2274 | } | |
2275 | EXPORT_SYMBOL_GPL(kvm_clear_guest); | |
2276 | ||
bc009e43 | 2277 | static void mark_page_dirty_in_slot(struct kvm_memory_slot *memslot, |
7940876e | 2278 | gfn_t gfn) |
6aa8b732 | 2279 | { |
7e9d619d RR |
2280 | if (memslot && memslot->dirty_bitmap) { |
2281 | unsigned long rel_gfn = gfn - memslot->base_gfn; | |
6aa8b732 | 2282 | |
b74ca3b3 | 2283 | set_bit_le(rel_gfn, memslot->dirty_bitmap); |
6aa8b732 AK |
2284 | } |
2285 | } | |
2286 | ||
49c7754c GN |
2287 | void mark_page_dirty(struct kvm *kvm, gfn_t gfn) |
2288 | { | |
2289 | struct kvm_memory_slot *memslot; | |
2290 | ||
2291 | memslot = gfn_to_memslot(kvm, gfn); | |
bc009e43 | 2292 | mark_page_dirty_in_slot(memslot, gfn); |
49c7754c | 2293 | } |
2ba9f0d8 | 2294 | EXPORT_SYMBOL_GPL(mark_page_dirty); |
49c7754c | 2295 | |
8e73485c PB |
2296 | void kvm_vcpu_mark_page_dirty(struct kvm_vcpu *vcpu, gfn_t gfn) |
2297 | { | |
2298 | struct kvm_memory_slot *memslot; | |
2299 | ||
2300 | memslot = kvm_vcpu_gfn_to_memslot(vcpu, gfn); | |
2301 | mark_page_dirty_in_slot(memslot, gfn); | |
2302 | } | |
2303 | EXPORT_SYMBOL_GPL(kvm_vcpu_mark_page_dirty); | |
2304 | ||
20b7035c JS |
2305 | void kvm_sigset_activate(struct kvm_vcpu *vcpu) |
2306 | { | |
2307 | if (!vcpu->sigset_active) | |
2308 | return; | |
2309 | ||
2310 | /* | |
2311 | * This does a lockless modification of ->real_blocked, which is fine | |
2312 | * because, only current can change ->real_blocked and all readers of | |
2313 | * ->real_blocked don't care as long ->real_blocked is always a subset | |
2314 | * of ->blocked. | |
2315 | */ | |
2316 | sigprocmask(SIG_SETMASK, &vcpu->sigset, ¤t->real_blocked); | |
2317 | } | |
2318 | ||
2319 | void kvm_sigset_deactivate(struct kvm_vcpu *vcpu) | |
2320 | { | |
2321 | if (!vcpu->sigset_active) | |
2322 | return; | |
2323 | ||
2324 | sigprocmask(SIG_SETMASK, ¤t->real_blocked, NULL); | |
2325 | sigemptyset(¤t->real_blocked); | |
2326 | } | |
2327 | ||
aca6ff29 WL |
2328 | static void grow_halt_poll_ns(struct kvm_vcpu *vcpu) |
2329 | { | |
dee339b5 | 2330 | unsigned int old, val, grow, grow_start; |
aca6ff29 | 2331 | |
2cbd7824 | 2332 | old = val = vcpu->halt_poll_ns; |
dee339b5 | 2333 | grow_start = READ_ONCE(halt_poll_ns_grow_start); |
6b6de68c | 2334 | grow = READ_ONCE(halt_poll_ns_grow); |
7fa08e71 NW |
2335 | if (!grow) |
2336 | goto out; | |
2337 | ||
dee339b5 NW |
2338 | val *= grow; |
2339 | if (val < grow_start) | |
2340 | val = grow_start; | |
aca6ff29 | 2341 | |
313f636d DM |
2342 | if (val > halt_poll_ns) |
2343 | val = halt_poll_ns; | |
2344 | ||
aca6ff29 | 2345 | vcpu->halt_poll_ns = val; |
7fa08e71 | 2346 | out: |
2cbd7824 | 2347 | trace_kvm_halt_poll_ns_grow(vcpu->vcpu_id, val, old); |
aca6ff29 WL |
2348 | } |
2349 | ||
2350 | static void shrink_halt_poll_ns(struct kvm_vcpu *vcpu) | |
2351 | { | |
6b6de68c | 2352 | unsigned int old, val, shrink; |
aca6ff29 | 2353 | |
2cbd7824 | 2354 | old = val = vcpu->halt_poll_ns; |
6b6de68c CB |
2355 | shrink = READ_ONCE(halt_poll_ns_shrink); |
2356 | if (shrink == 0) | |
aca6ff29 WL |
2357 | val = 0; |
2358 | else | |
6b6de68c | 2359 | val /= shrink; |
aca6ff29 WL |
2360 | |
2361 | vcpu->halt_poll_ns = val; | |
2cbd7824 | 2362 | trace_kvm_halt_poll_ns_shrink(vcpu->vcpu_id, val, old); |
aca6ff29 WL |
2363 | } |
2364 | ||
f7819512 PB |
2365 | static int kvm_vcpu_check_block(struct kvm_vcpu *vcpu) |
2366 | { | |
50c28f21 JS |
2367 | int ret = -EINTR; |
2368 | int idx = srcu_read_lock(&vcpu->kvm->srcu); | |
2369 | ||
f7819512 PB |
2370 | if (kvm_arch_vcpu_runnable(vcpu)) { |
2371 | kvm_make_request(KVM_REQ_UNHALT, vcpu); | |
50c28f21 | 2372 | goto out; |
f7819512 PB |
2373 | } |
2374 | if (kvm_cpu_has_pending_timer(vcpu)) | |
50c28f21 | 2375 | goto out; |
f7819512 | 2376 | if (signal_pending(current)) |
50c28f21 | 2377 | goto out; |
f7819512 | 2378 | |
50c28f21 JS |
2379 | ret = 0; |
2380 | out: | |
2381 | srcu_read_unlock(&vcpu->kvm->srcu, idx); | |
2382 | return ret; | |
f7819512 PB |
2383 | } |
2384 | ||
b6958ce4 ED |
2385 | /* |
2386 | * The vCPU has executed a HLT instruction with in-kernel mode enabled. | |
2387 | */ | |
8776e519 | 2388 | void kvm_vcpu_block(struct kvm_vcpu *vcpu) |
d3bef15f | 2389 | { |
f7819512 | 2390 | ktime_t start, cur; |
8577370f | 2391 | DECLARE_SWAITQUEUE(wait); |
f7819512 | 2392 | bool waited = false; |
aca6ff29 | 2393 | u64 block_ns; |
f7819512 | 2394 | |
07ab0f8d MZ |
2395 | kvm_arch_vcpu_blocking(vcpu); |
2396 | ||
f7819512 | 2397 | start = cur = ktime_get(); |
cdd6ad3a | 2398 | if (vcpu->halt_poll_ns && !kvm_arch_no_poll(vcpu)) { |
19020f8a | 2399 | ktime_t stop = ktime_add_ns(ktime_get(), vcpu->halt_poll_ns); |
f95ef0cd | 2400 | |
62bea5bf | 2401 | ++vcpu->stat.halt_attempted_poll; |
f7819512 PB |
2402 | do { |
2403 | /* | |
2404 | * This sets KVM_REQ_UNHALT if an interrupt | |
2405 | * arrives. | |
2406 | */ | |
2407 | if (kvm_vcpu_check_block(vcpu) < 0) { | |
2408 | ++vcpu->stat.halt_successful_poll; | |
3491caf2 CB |
2409 | if (!vcpu_valid_wakeup(vcpu)) |
2410 | ++vcpu->stat.halt_poll_invalid; | |
f7819512 PB |
2411 | goto out; |
2412 | } | |
2413 | cur = ktime_get(); | |
2414 | } while (single_task_running() && ktime_before(cur, stop)); | |
2415 | } | |
e5c239cf MT |
2416 | |
2417 | for (;;) { | |
b3dae109 | 2418 | prepare_to_swait_exclusive(&vcpu->wq, &wait, TASK_INTERRUPTIBLE); |
e5c239cf | 2419 | |
f7819512 | 2420 | if (kvm_vcpu_check_block(vcpu) < 0) |
e5c239cf MT |
2421 | break; |
2422 | ||
f7819512 | 2423 | waited = true; |
b6958ce4 | 2424 | schedule(); |
b6958ce4 | 2425 | } |
d3bef15f | 2426 | |
8577370f | 2427 | finish_swait(&vcpu->wq, &wait); |
f7819512 | 2428 | cur = ktime_get(); |
f7819512 | 2429 | out: |
07ab0f8d | 2430 | kvm_arch_vcpu_unblocking(vcpu); |
aca6ff29 WL |
2431 | block_ns = ktime_to_ns(cur) - ktime_to_ns(start); |
2432 | ||
44551b2f WL |
2433 | if (!kvm_arch_no_poll(vcpu)) { |
2434 | if (!vcpu_valid_wakeup(vcpu)) { | |
aca6ff29 | 2435 | shrink_halt_poll_ns(vcpu); |
44551b2f WL |
2436 | } else if (halt_poll_ns) { |
2437 | if (block_ns <= vcpu->halt_poll_ns) | |
2438 | ; | |
2439 | /* we had a long block, shrink polling */ | |
2440 | else if (vcpu->halt_poll_ns && block_ns > halt_poll_ns) | |
2441 | shrink_halt_poll_ns(vcpu); | |
2442 | /* we had a short halt and our poll time is too small */ | |
2443 | else if (vcpu->halt_poll_ns < halt_poll_ns && | |
2444 | block_ns < halt_poll_ns) | |
2445 | grow_halt_poll_ns(vcpu); | |
2446 | } else { | |
2447 | vcpu->halt_poll_ns = 0; | |
2448 | } | |
2449 | } | |
aca6ff29 | 2450 | |
3491caf2 CB |
2451 | trace_kvm_vcpu_wakeup(block_ns, waited, vcpu_valid_wakeup(vcpu)); |
2452 | kvm_arch_vcpu_block_finish(vcpu); | |
b6958ce4 | 2453 | } |
2ba9f0d8 | 2454 | EXPORT_SYMBOL_GPL(kvm_vcpu_block); |
b6958ce4 | 2455 | |
178f02ff | 2456 | bool kvm_vcpu_wake_up(struct kvm_vcpu *vcpu) |
b6d33834 | 2457 | { |
8577370f | 2458 | struct swait_queue_head *wqp; |
b6d33834 CD |
2459 | |
2460 | wqp = kvm_arch_vcpu_wq(vcpu); | |
5e0018b3 | 2461 | if (swq_has_sleeper(wqp)) { |
b3dae109 | 2462 | swake_up_one(wqp); |
d73eb57b | 2463 | WRITE_ONCE(vcpu->ready, true); |
b6d33834 | 2464 | ++vcpu->stat.halt_wakeup; |
178f02ff | 2465 | return true; |
b6d33834 CD |
2466 | } |
2467 | ||
178f02ff | 2468 | return false; |
dd1a4cc1 RK |
2469 | } |
2470 | EXPORT_SYMBOL_GPL(kvm_vcpu_wake_up); | |
2471 | ||
0266c894 | 2472 | #ifndef CONFIG_S390 |
dd1a4cc1 RK |
2473 | /* |
2474 | * Kick a sleeping VCPU, or a guest VCPU in guest mode, into host kernel mode. | |
2475 | */ | |
2476 | void kvm_vcpu_kick(struct kvm_vcpu *vcpu) | |
2477 | { | |
2478 | int me; | |
2479 | int cpu = vcpu->cpu; | |
2480 | ||
178f02ff RK |
2481 | if (kvm_vcpu_wake_up(vcpu)) |
2482 | return; | |
2483 | ||
b6d33834 CD |
2484 | me = get_cpu(); |
2485 | if (cpu != me && (unsigned)cpu < nr_cpu_ids && cpu_online(cpu)) | |
2486 | if (kvm_arch_vcpu_should_kick(vcpu)) | |
2487 | smp_send_reschedule(cpu); | |
2488 | put_cpu(); | |
2489 | } | |
a20ed54d | 2490 | EXPORT_SYMBOL_GPL(kvm_vcpu_kick); |
0266c894 | 2491 | #endif /* !CONFIG_S390 */ |
b6d33834 | 2492 | |
fa93384f | 2493 | int kvm_vcpu_yield_to(struct kvm_vcpu *target) |
41628d33 KW |
2494 | { |
2495 | struct pid *pid; | |
2496 | struct task_struct *task = NULL; | |
fa93384f | 2497 | int ret = 0; |
41628d33 KW |
2498 | |
2499 | rcu_read_lock(); | |
2500 | pid = rcu_dereference(target->pid); | |
2501 | if (pid) | |
27fbe64b | 2502 | task = get_pid_task(pid, PIDTYPE_PID); |
41628d33 KW |
2503 | rcu_read_unlock(); |
2504 | if (!task) | |
c45c528e | 2505 | return ret; |
c45c528e | 2506 | ret = yield_to(task, 1); |
41628d33 | 2507 | put_task_struct(task); |
c45c528e R |
2508 | |
2509 | return ret; | |
41628d33 KW |
2510 | } |
2511 | EXPORT_SYMBOL_GPL(kvm_vcpu_yield_to); | |
2512 | ||
06e48c51 R |
2513 | /* |
2514 | * Helper that checks whether a VCPU is eligible for directed yield. | |
2515 | * Most eligible candidate to yield is decided by following heuristics: | |
2516 | * | |
2517 | * (a) VCPU which has not done pl-exit or cpu relax intercepted recently | |
2518 | * (preempted lock holder), indicated by @in_spin_loop. | |
2519 | * Set at the beiginning and cleared at the end of interception/PLE handler. | |
2520 | * | |
2521 | * (b) VCPU which has done pl-exit/ cpu relax intercepted but did not get | |
2522 | * chance last time (mostly it has become eligible now since we have probably | |
2523 | * yielded to lockholder in last iteration. This is done by toggling | |
2524 | * @dy_eligible each time a VCPU checked for eligibility.) | |
2525 | * | |
2526 | * Yielding to a recently pl-exited/cpu relax intercepted VCPU before yielding | |
2527 | * to preempted lock-holder could result in wrong VCPU selection and CPU | |
2528 | * burning. Giving priority for a potential lock-holder increases lock | |
2529 | * progress. | |
2530 | * | |
2531 | * Since algorithm is based on heuristics, accessing another VCPU data without | |
2532 | * locking does not harm. It may result in trying to yield to same VCPU, fail | |
2533 | * and continue with next VCPU and so on. | |
2534 | */ | |
7940876e | 2535 | static bool kvm_vcpu_eligible_for_directed_yield(struct kvm_vcpu *vcpu) |
06e48c51 | 2536 | { |
4a55dd72 | 2537 | #ifdef CONFIG_HAVE_KVM_CPU_RELAX_INTERCEPT |
06e48c51 R |
2538 | bool eligible; |
2539 | ||
2540 | eligible = !vcpu->spin_loop.in_spin_loop || | |
34656113 | 2541 | vcpu->spin_loop.dy_eligible; |
06e48c51 R |
2542 | |
2543 | if (vcpu->spin_loop.in_spin_loop) | |
2544 | kvm_vcpu_set_dy_eligible(vcpu, !vcpu->spin_loop.dy_eligible); | |
2545 | ||
2546 | return eligible; | |
4a55dd72 SW |
2547 | #else |
2548 | return true; | |
06e48c51 | 2549 | #endif |
4a55dd72 | 2550 | } |
c45c528e | 2551 | |
17e433b5 WL |
2552 | /* |
2553 | * Unlike kvm_arch_vcpu_runnable, this function is called outside | |
2554 | * a vcpu_load/vcpu_put pair. However, for most architectures | |
2555 | * kvm_arch_vcpu_runnable does not require vcpu_load. | |
2556 | */ | |
2557 | bool __weak kvm_arch_dy_runnable(struct kvm_vcpu *vcpu) | |
2558 | { | |
2559 | return kvm_arch_vcpu_runnable(vcpu); | |
2560 | } | |
2561 | ||
2562 | static bool vcpu_dy_runnable(struct kvm_vcpu *vcpu) | |
2563 | { | |
2564 | if (kvm_arch_dy_runnable(vcpu)) | |
2565 | return true; | |
2566 | ||
2567 | #ifdef CONFIG_KVM_ASYNC_PF | |
2568 | if (!list_empty_careful(&vcpu->async_pf.done)) | |
2569 | return true; | |
2570 | #endif | |
2571 | ||
2572 | return false; | |
2573 | } | |
2574 | ||
199b5763 | 2575 | void kvm_vcpu_on_spin(struct kvm_vcpu *me, bool yield_to_kernel_mode) |
d255f4f2 | 2576 | { |
217ece61 RR |
2577 | struct kvm *kvm = me->kvm; |
2578 | struct kvm_vcpu *vcpu; | |
2579 | int last_boosted_vcpu = me->kvm->last_boosted_vcpu; | |
2580 | int yielded = 0; | |
c45c528e | 2581 | int try = 3; |
217ece61 RR |
2582 | int pass; |
2583 | int i; | |
d255f4f2 | 2584 | |
4c088493 | 2585 | kvm_vcpu_set_in_spin_loop(me, true); |
217ece61 RR |
2586 | /* |
2587 | * We boost the priority of a VCPU that is runnable but not | |
2588 | * currently running, because it got preempted by something | |
2589 | * else and called schedule in __vcpu_run. Hopefully that | |
2590 | * VCPU is holding the lock that we need and will release it. | |
2591 | * We approximate round-robin by starting at the last boosted VCPU. | |
2592 | */ | |
c45c528e | 2593 | for (pass = 0; pass < 2 && !yielded && try; pass++) { |
217ece61 | 2594 | kvm_for_each_vcpu(i, vcpu, kvm) { |
5cfc2aab | 2595 | if (!pass && i <= last_boosted_vcpu) { |
217ece61 RR |
2596 | i = last_boosted_vcpu; |
2597 | continue; | |
2598 | } else if (pass && i > last_boosted_vcpu) | |
2599 | break; | |
d73eb57b | 2600 | if (!READ_ONCE(vcpu->ready)) |
7bc7ae25 | 2601 | continue; |
217ece61 RR |
2602 | if (vcpu == me) |
2603 | continue; | |
17e433b5 | 2604 | if (swait_active(&vcpu->wq) && !vcpu_dy_runnable(vcpu)) |
217ece61 | 2605 | continue; |
046ddeed WL |
2606 | if (READ_ONCE(vcpu->preempted) && yield_to_kernel_mode && |
2607 | !kvm_arch_vcpu_in_kernel(vcpu)) | |
199b5763 | 2608 | continue; |
06e48c51 R |
2609 | if (!kvm_vcpu_eligible_for_directed_yield(vcpu)) |
2610 | continue; | |
c45c528e R |
2611 | |
2612 | yielded = kvm_vcpu_yield_to(vcpu); | |
2613 | if (yielded > 0) { | |
217ece61 | 2614 | kvm->last_boosted_vcpu = i; |
217ece61 | 2615 | break; |
c45c528e R |
2616 | } else if (yielded < 0) { |
2617 | try--; | |
2618 | if (!try) | |
2619 | break; | |
217ece61 | 2620 | } |
217ece61 RR |
2621 | } |
2622 | } | |
4c088493 | 2623 | kvm_vcpu_set_in_spin_loop(me, false); |
06e48c51 R |
2624 | |
2625 | /* Ensure vcpu is not eligible during next spinloop */ | |
2626 | kvm_vcpu_set_dy_eligible(me, false); | |
d255f4f2 ZE |
2627 | } |
2628 | EXPORT_SYMBOL_GPL(kvm_vcpu_on_spin); | |
2629 | ||
1499fa80 | 2630 | static vm_fault_t kvm_vcpu_fault(struct vm_fault *vmf) |
9a2bb7f4 | 2631 | { |
11bac800 | 2632 | struct kvm_vcpu *vcpu = vmf->vma->vm_file->private_data; |
9a2bb7f4 AK |
2633 | struct page *page; |
2634 | ||
e4a533a4 | 2635 | if (vmf->pgoff == 0) |
039576c0 | 2636 | page = virt_to_page(vcpu->run); |
09566765 | 2637 | #ifdef CONFIG_X86 |
e4a533a4 | 2638 | else if (vmf->pgoff == KVM_PIO_PAGE_OFFSET) |
ad312c7c | 2639 | page = virt_to_page(vcpu->arch.pio_data); |
5f94c174 | 2640 | #endif |
4b4357e0 | 2641 | #ifdef CONFIG_KVM_MMIO |
5f94c174 LV |
2642 | else if (vmf->pgoff == KVM_COALESCED_MMIO_PAGE_OFFSET) |
2643 | page = virt_to_page(vcpu->kvm->coalesced_mmio_ring); | |
09566765 | 2644 | #endif |
039576c0 | 2645 | else |
5b1c1493 | 2646 | return kvm_arch_vcpu_fault(vcpu, vmf); |
9a2bb7f4 | 2647 | get_page(page); |
e4a533a4 | 2648 | vmf->page = page; |
2649 | return 0; | |
9a2bb7f4 AK |
2650 | } |
2651 | ||
f0f37e2f | 2652 | static const struct vm_operations_struct kvm_vcpu_vm_ops = { |
e4a533a4 | 2653 | .fault = kvm_vcpu_fault, |
9a2bb7f4 AK |
2654 | }; |
2655 | ||
2656 | static int kvm_vcpu_mmap(struct file *file, struct vm_area_struct *vma) | |
2657 | { | |
2658 | vma->vm_ops = &kvm_vcpu_vm_ops; | |
2659 | return 0; | |
2660 | } | |
2661 | ||
bccf2150 AK |
2662 | static int kvm_vcpu_release(struct inode *inode, struct file *filp) |
2663 | { | |
2664 | struct kvm_vcpu *vcpu = filp->private_data; | |
2665 | ||
45b5939e | 2666 | debugfs_remove_recursive(vcpu->debugfs_dentry); |
66c0b394 | 2667 | kvm_put_kvm(vcpu->kvm); |
bccf2150 AK |
2668 | return 0; |
2669 | } | |
2670 | ||
3d3aab1b | 2671 | static struct file_operations kvm_vcpu_fops = { |
bccf2150 AK |
2672 | .release = kvm_vcpu_release, |
2673 | .unlocked_ioctl = kvm_vcpu_ioctl, | |
9a2bb7f4 | 2674 | .mmap = kvm_vcpu_mmap, |
6038f373 | 2675 | .llseek = noop_llseek, |
7ddfd3e0 | 2676 | KVM_COMPAT(kvm_vcpu_compat_ioctl), |
bccf2150 AK |
2677 | }; |
2678 | ||
2679 | /* | |
2680 | * Allocates an inode for the vcpu. | |
2681 | */ | |
2682 | static int create_vcpu_fd(struct kvm_vcpu *vcpu) | |
2683 | { | |
e46b4692 MY |
2684 | char name[8 + 1 + ITOA_MAX_LEN + 1]; |
2685 | ||
2686 | snprintf(name, sizeof(name), "kvm-vcpu:%d", vcpu->vcpu_id); | |
2687 | return anon_inode_getfd(name, &kvm_vcpu_fops, vcpu, O_RDWR | O_CLOEXEC); | |
bccf2150 AK |
2688 | } |
2689 | ||
3e7093d0 | 2690 | static void kvm_create_vcpu_debugfs(struct kvm_vcpu *vcpu) |
45b5939e | 2691 | { |
741cbbae | 2692 | #ifdef __KVM_HAVE_ARCH_VCPU_DEBUGFS |
45b5939e | 2693 | char dir_name[ITOA_MAX_LEN * 2]; |
45b5939e | 2694 | |
45b5939e | 2695 | if (!debugfs_initialized()) |
3e7093d0 | 2696 | return; |
45b5939e LC |
2697 | |
2698 | snprintf(dir_name, sizeof(dir_name), "vcpu%d", vcpu->vcpu_id); | |
2699 | vcpu->debugfs_dentry = debugfs_create_dir(dir_name, | |
3e7093d0 | 2700 | vcpu->kvm->debugfs_dentry); |
45b5939e | 2701 | |
3e7093d0 | 2702 | kvm_arch_create_vcpu_debugfs(vcpu); |
741cbbae | 2703 | #endif |
45b5939e LC |
2704 | } |
2705 | ||
c5ea7660 AK |
2706 | /* |
2707 | * Creates some virtual cpus. Good luck creating more than one. | |
2708 | */ | |
73880c80 | 2709 | static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, u32 id) |
c5ea7660 AK |
2710 | { |
2711 | int r; | |
e09fefde | 2712 | struct kvm_vcpu *vcpu; |
c5ea7660 | 2713 | |
0b1b1dfd | 2714 | if (id >= KVM_MAX_VCPU_ID) |
338c7dba AH |
2715 | return -EINVAL; |
2716 | ||
6c7caebc PB |
2717 | mutex_lock(&kvm->lock); |
2718 | if (kvm->created_vcpus == KVM_MAX_VCPUS) { | |
2719 | mutex_unlock(&kvm->lock); | |
2720 | return -EINVAL; | |
2721 | } | |
2722 | ||
2723 | kvm->created_vcpus++; | |
2724 | mutex_unlock(&kvm->lock); | |
2725 | ||
897cc38e SC |
2726 | r = kvm_arch_vcpu_precreate(kvm, id); |
2727 | if (r) | |
2728 | goto vcpu_decrement; | |
2729 | ||
e529ef66 SC |
2730 | vcpu = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL); |
2731 | if (!vcpu) { | |
2732 | r = -ENOMEM; | |
6c7caebc PB |
2733 | goto vcpu_decrement; |
2734 | } | |
c5ea7660 | 2735 | |
e529ef66 SC |
2736 | r = kvm_vcpu_init(vcpu, kvm, id); |
2737 | if (r) | |
2738 | goto vcpu_free; | |
2739 | ||
2740 | r = kvm_arch_vcpu_create(vcpu); | |
2741 | if (r) | |
2742 | goto vcpu_uninit; | |
2743 | ||
3e7093d0 | 2744 | kvm_create_vcpu_debugfs(vcpu); |
45b5939e | 2745 | |
11ec2804 | 2746 | mutex_lock(&kvm->lock); |
e09fefde DH |
2747 | if (kvm_get_vcpu_by_id(kvm, id)) { |
2748 | r = -EEXIST; | |
2749 | goto unlock_vcpu_destroy; | |
2750 | } | |
73880c80 | 2751 | |
8750e72a RK |
2752 | vcpu->vcpu_idx = atomic_read(&kvm->online_vcpus); |
2753 | BUG_ON(kvm->vcpus[vcpu->vcpu_idx]); | |
c5ea7660 | 2754 | |
fb3f0f51 | 2755 | /* Now it's all set up, let userspace reach it */ |
66c0b394 | 2756 | kvm_get_kvm(kvm); |
bccf2150 | 2757 | r = create_vcpu_fd(vcpu); |
73880c80 | 2758 | if (r < 0) { |
149487bd | 2759 | kvm_put_kvm_no_destroy(kvm); |
d780592b | 2760 | goto unlock_vcpu_destroy; |
73880c80 GN |
2761 | } |
2762 | ||
8750e72a | 2763 | kvm->vcpus[vcpu->vcpu_idx] = vcpu; |
dd489240 PB |
2764 | |
2765 | /* | |
2766 | * Pairs with smp_rmb() in kvm_get_vcpu. Write kvm->vcpus | |
2767 | * before kvm->online_vcpu's incremented value. | |
2768 | */ | |
73880c80 GN |
2769 | smp_wmb(); |
2770 | atomic_inc(&kvm->online_vcpus); | |
2771 | ||
73880c80 | 2772 | mutex_unlock(&kvm->lock); |
42897d86 | 2773 | kvm_arch_vcpu_postcreate(vcpu); |
fb3f0f51 | 2774 | return r; |
39c3b86e | 2775 | |
d780592b | 2776 | unlock_vcpu_destroy: |
7d8fece6 | 2777 | mutex_unlock(&kvm->lock); |
45b5939e | 2778 | debugfs_remove_recursive(vcpu->debugfs_dentry); |
d40ccc62 | 2779 | kvm_arch_vcpu_destroy(vcpu); |
e529ef66 SC |
2780 | vcpu_uninit: |
2781 | kvm_vcpu_uninit(vcpu); | |
2782 | vcpu_free: | |
2783 | kmem_cache_free(kvm_vcpu_cache, vcpu); | |
6c7caebc PB |
2784 | vcpu_decrement: |
2785 | mutex_lock(&kvm->lock); | |
2786 | kvm->created_vcpus--; | |
2787 | mutex_unlock(&kvm->lock); | |
c5ea7660 AK |
2788 | return r; |
2789 | } | |
2790 | ||
1961d276 AK |
2791 | static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu *vcpu, sigset_t *sigset) |
2792 | { | |
2793 | if (sigset) { | |
2794 | sigdelsetmask(sigset, sigmask(SIGKILL)|sigmask(SIGSTOP)); | |
2795 | vcpu->sigset_active = 1; | |
2796 | vcpu->sigset = *sigset; | |
2797 | } else | |
2798 | vcpu->sigset_active = 0; | |
2799 | return 0; | |
2800 | } | |
2801 | ||
bccf2150 AK |
2802 | static long kvm_vcpu_ioctl(struct file *filp, |
2803 | unsigned int ioctl, unsigned long arg) | |
6aa8b732 | 2804 | { |
bccf2150 | 2805 | struct kvm_vcpu *vcpu = filp->private_data; |
2f366987 | 2806 | void __user *argp = (void __user *)arg; |
313a3dc7 | 2807 | int r; |
fa3795a7 DH |
2808 | struct kvm_fpu *fpu = NULL; |
2809 | struct kvm_sregs *kvm_sregs = NULL; | |
6aa8b732 | 2810 | |
6d4e4c4f AK |
2811 | if (vcpu->kvm->mm != current->mm) |
2812 | return -EIO; | |
2122ff5e | 2813 | |
2ea75be3 DM |
2814 | if (unlikely(_IOC_TYPE(ioctl) != KVMIO)) |
2815 | return -EINVAL; | |
2816 | ||
2122ff5e | 2817 | /* |
5cb0944c PB |
2818 | * Some architectures have vcpu ioctls that are asynchronous to vcpu |
2819 | * execution; mutex_lock() would break them. | |
2122ff5e | 2820 | */ |
5cb0944c PB |
2821 | r = kvm_arch_vcpu_async_ioctl(filp, ioctl, arg); |
2822 | if (r != -ENOIOCTLCMD) | |
9fc77441 | 2823 | return r; |
2122ff5e | 2824 | |
ec7660cc CD |
2825 | if (mutex_lock_killable(&vcpu->mutex)) |
2826 | return -EINTR; | |
6aa8b732 | 2827 | switch (ioctl) { |
0e4524a5 CB |
2828 | case KVM_RUN: { |
2829 | struct pid *oldpid; | |
f0fe5108 AK |
2830 | r = -EINVAL; |
2831 | if (arg) | |
2832 | goto out; | |
0e4524a5 | 2833 | oldpid = rcu_access_pointer(vcpu->pid); |
71dbc8a9 | 2834 | if (unlikely(oldpid != task_pid(current))) { |
7a72f7a1 | 2835 | /* The thread running this VCPU changed. */ |
bd2a6394 | 2836 | struct pid *newpid; |
f95ef0cd | 2837 | |
bd2a6394 CD |
2838 | r = kvm_arch_vcpu_run_pid_change(vcpu); |
2839 | if (r) | |
2840 | break; | |
2841 | ||
2842 | newpid = get_task_pid(current, PIDTYPE_PID); | |
7a72f7a1 CB |
2843 | rcu_assign_pointer(vcpu->pid, newpid); |
2844 | if (oldpid) | |
2845 | synchronize_rcu(); | |
2846 | put_pid(oldpid); | |
2847 | } | |
b6c7a5dc | 2848 | r = kvm_arch_vcpu_ioctl_run(vcpu, vcpu->run); |
64be5007 | 2849 | trace_kvm_userspace_exit(vcpu->run->exit_reason, r); |
6aa8b732 | 2850 | break; |
0e4524a5 | 2851 | } |
6aa8b732 | 2852 | case KVM_GET_REGS: { |
3e4bb3ac | 2853 | struct kvm_regs *kvm_regs; |
6aa8b732 | 2854 | |
3e4bb3ac | 2855 | r = -ENOMEM; |
b12ce36a | 2856 | kvm_regs = kzalloc(sizeof(struct kvm_regs), GFP_KERNEL_ACCOUNT); |
3e4bb3ac | 2857 | if (!kvm_regs) |
6aa8b732 | 2858 | goto out; |
3e4bb3ac XZ |
2859 | r = kvm_arch_vcpu_ioctl_get_regs(vcpu, kvm_regs); |
2860 | if (r) | |
2861 | goto out_free1; | |
6aa8b732 | 2862 | r = -EFAULT; |
3e4bb3ac XZ |
2863 | if (copy_to_user(argp, kvm_regs, sizeof(struct kvm_regs))) |
2864 | goto out_free1; | |
6aa8b732 | 2865 | r = 0; |
3e4bb3ac XZ |
2866 | out_free1: |
2867 | kfree(kvm_regs); | |
6aa8b732 AK |
2868 | break; |
2869 | } | |
2870 | case KVM_SET_REGS: { | |
3e4bb3ac | 2871 | struct kvm_regs *kvm_regs; |
6aa8b732 | 2872 | |
3e4bb3ac | 2873 | r = -ENOMEM; |
ff5c2c03 SL |
2874 | kvm_regs = memdup_user(argp, sizeof(*kvm_regs)); |
2875 | if (IS_ERR(kvm_regs)) { | |
2876 | r = PTR_ERR(kvm_regs); | |
6aa8b732 | 2877 | goto out; |
ff5c2c03 | 2878 | } |
3e4bb3ac | 2879 | r = kvm_arch_vcpu_ioctl_set_regs(vcpu, kvm_regs); |
3e4bb3ac | 2880 | kfree(kvm_regs); |
6aa8b732 AK |
2881 | break; |
2882 | } | |
2883 | case KVM_GET_SREGS: { | |
b12ce36a BG |
2884 | kvm_sregs = kzalloc(sizeof(struct kvm_sregs), |
2885 | GFP_KERNEL_ACCOUNT); | |
fa3795a7 DH |
2886 | r = -ENOMEM; |
2887 | if (!kvm_sregs) | |
2888 | goto out; | |
2889 | r = kvm_arch_vcpu_ioctl_get_sregs(vcpu, kvm_sregs); | |
6aa8b732 AK |
2890 | if (r) |
2891 | goto out; | |
2892 | r = -EFAULT; | |
fa3795a7 | 2893 | if (copy_to_user(argp, kvm_sregs, sizeof(struct kvm_sregs))) |
6aa8b732 AK |
2894 | goto out; |
2895 | r = 0; | |
2896 | break; | |
2897 | } | |
2898 | case KVM_SET_SREGS: { | |
ff5c2c03 SL |
2899 | kvm_sregs = memdup_user(argp, sizeof(*kvm_sregs)); |
2900 | if (IS_ERR(kvm_sregs)) { | |
2901 | r = PTR_ERR(kvm_sregs); | |
18595411 | 2902 | kvm_sregs = NULL; |
6aa8b732 | 2903 | goto out; |
ff5c2c03 | 2904 | } |
fa3795a7 | 2905 | r = kvm_arch_vcpu_ioctl_set_sregs(vcpu, kvm_sregs); |
6aa8b732 AK |
2906 | break; |
2907 | } | |
62d9f0db MT |
2908 | case KVM_GET_MP_STATE: { |
2909 | struct kvm_mp_state mp_state; | |
2910 | ||
2911 | r = kvm_arch_vcpu_ioctl_get_mpstate(vcpu, &mp_state); | |
2912 | if (r) | |
2913 | goto out; | |
2914 | r = -EFAULT; | |
893bdbf1 | 2915 | if (copy_to_user(argp, &mp_state, sizeof(mp_state))) |
62d9f0db MT |
2916 | goto out; |
2917 | r = 0; | |
2918 | break; | |
2919 | } | |
2920 | case KVM_SET_MP_STATE: { | |
2921 | struct kvm_mp_state mp_state; | |
2922 | ||
2923 | r = -EFAULT; | |
893bdbf1 | 2924 | if (copy_from_user(&mp_state, argp, sizeof(mp_state))) |
62d9f0db MT |
2925 | goto out; |
2926 | r = kvm_arch_vcpu_ioctl_set_mpstate(vcpu, &mp_state); | |
62d9f0db MT |
2927 | break; |
2928 | } | |
6aa8b732 AK |
2929 | case KVM_TRANSLATE: { |
2930 | struct kvm_translation tr; | |
2931 | ||
2932 | r = -EFAULT; | |
893bdbf1 | 2933 | if (copy_from_user(&tr, argp, sizeof(tr))) |
6aa8b732 | 2934 | goto out; |
8b006791 | 2935 | r = kvm_arch_vcpu_ioctl_translate(vcpu, &tr); |
6aa8b732 AK |
2936 | if (r) |
2937 | goto out; | |
2938 | r = -EFAULT; | |
893bdbf1 | 2939 | if (copy_to_user(argp, &tr, sizeof(tr))) |
6aa8b732 AK |
2940 | goto out; |
2941 | r = 0; | |
2942 | break; | |
2943 | } | |
d0bfb940 JK |
2944 | case KVM_SET_GUEST_DEBUG: { |
2945 | struct kvm_guest_debug dbg; | |
6aa8b732 AK |
2946 | |
2947 | r = -EFAULT; | |
893bdbf1 | 2948 | if (copy_from_user(&dbg, argp, sizeof(dbg))) |
6aa8b732 | 2949 | goto out; |
d0bfb940 | 2950 | r = kvm_arch_vcpu_ioctl_set_guest_debug(vcpu, &dbg); |
6aa8b732 AK |
2951 | break; |
2952 | } | |
1961d276 AK |
2953 | case KVM_SET_SIGNAL_MASK: { |
2954 | struct kvm_signal_mask __user *sigmask_arg = argp; | |
2955 | struct kvm_signal_mask kvm_sigmask; | |
2956 | sigset_t sigset, *p; | |
2957 | ||
2958 | p = NULL; | |
2959 | if (argp) { | |
2960 | r = -EFAULT; | |
2961 | if (copy_from_user(&kvm_sigmask, argp, | |
893bdbf1 | 2962 | sizeof(kvm_sigmask))) |
1961d276 AK |
2963 | goto out; |
2964 | r = -EINVAL; | |
893bdbf1 | 2965 | if (kvm_sigmask.len != sizeof(sigset)) |
1961d276 AK |
2966 | goto out; |
2967 | r = -EFAULT; | |
2968 | if (copy_from_user(&sigset, sigmask_arg->sigset, | |
893bdbf1 | 2969 | sizeof(sigset))) |
1961d276 AK |
2970 | goto out; |
2971 | p = &sigset; | |
2972 | } | |
376d41ff | 2973 | r = kvm_vcpu_ioctl_set_sigmask(vcpu, p); |
1961d276 AK |
2974 | break; |
2975 | } | |
b8836737 | 2976 | case KVM_GET_FPU: { |
b12ce36a | 2977 | fpu = kzalloc(sizeof(struct kvm_fpu), GFP_KERNEL_ACCOUNT); |
fa3795a7 DH |
2978 | r = -ENOMEM; |
2979 | if (!fpu) | |
2980 | goto out; | |
2981 | r = kvm_arch_vcpu_ioctl_get_fpu(vcpu, fpu); | |
b8836737 AK |
2982 | if (r) |
2983 | goto out; | |
2984 | r = -EFAULT; | |
fa3795a7 | 2985 | if (copy_to_user(argp, fpu, sizeof(struct kvm_fpu))) |
b8836737 AK |
2986 | goto out; |
2987 | r = 0; | |
2988 | break; | |
2989 | } | |
2990 | case KVM_SET_FPU: { | |
ff5c2c03 SL |
2991 | fpu = memdup_user(argp, sizeof(*fpu)); |
2992 | if (IS_ERR(fpu)) { | |
2993 | r = PTR_ERR(fpu); | |
18595411 | 2994 | fpu = NULL; |
b8836737 | 2995 | goto out; |
ff5c2c03 | 2996 | } |
fa3795a7 | 2997 | r = kvm_arch_vcpu_ioctl_set_fpu(vcpu, fpu); |
b8836737 AK |
2998 | break; |
2999 | } | |
bccf2150 | 3000 | default: |
313a3dc7 | 3001 | r = kvm_arch_vcpu_ioctl(filp, ioctl, arg); |
bccf2150 AK |
3002 | } |
3003 | out: | |
ec7660cc | 3004 | mutex_unlock(&vcpu->mutex); |
fa3795a7 DH |
3005 | kfree(fpu); |
3006 | kfree(kvm_sregs); | |
bccf2150 AK |
3007 | return r; |
3008 | } | |
3009 | ||
de8e5d74 | 3010 | #ifdef CONFIG_KVM_COMPAT |
1dda606c AG |
3011 | static long kvm_vcpu_compat_ioctl(struct file *filp, |
3012 | unsigned int ioctl, unsigned long arg) | |
3013 | { | |
3014 | struct kvm_vcpu *vcpu = filp->private_data; | |
3015 | void __user *argp = compat_ptr(arg); | |
3016 | int r; | |
3017 | ||
3018 | if (vcpu->kvm->mm != current->mm) | |
3019 | return -EIO; | |
3020 | ||
3021 | switch (ioctl) { | |
3022 | case KVM_SET_SIGNAL_MASK: { | |
3023 | struct kvm_signal_mask __user *sigmask_arg = argp; | |
3024 | struct kvm_signal_mask kvm_sigmask; | |
1dda606c AG |
3025 | sigset_t sigset; |
3026 | ||
3027 | if (argp) { | |
3028 | r = -EFAULT; | |
3029 | if (copy_from_user(&kvm_sigmask, argp, | |
893bdbf1 | 3030 | sizeof(kvm_sigmask))) |
1dda606c AG |
3031 | goto out; |
3032 | r = -EINVAL; | |
3968cf62 | 3033 | if (kvm_sigmask.len != sizeof(compat_sigset_t)) |
1dda606c AG |
3034 | goto out; |
3035 | r = -EFAULT; | |
3968cf62 | 3036 | if (get_compat_sigset(&sigset, (void *)sigmask_arg->sigset)) |
1dda606c | 3037 | goto out; |
760a9a30 AC |
3038 | r = kvm_vcpu_ioctl_set_sigmask(vcpu, &sigset); |
3039 | } else | |
3040 | r = kvm_vcpu_ioctl_set_sigmask(vcpu, NULL); | |
1dda606c AG |
3041 | break; |
3042 | } | |
3043 | default: | |
3044 | r = kvm_vcpu_ioctl(filp, ioctl, arg); | |
3045 | } | |
3046 | ||
3047 | out: | |
3048 | return r; | |
3049 | } | |
3050 | #endif | |
3051 | ||
a1cd3f08 CLG |
3052 | static int kvm_device_mmap(struct file *filp, struct vm_area_struct *vma) |
3053 | { | |
3054 | struct kvm_device *dev = filp->private_data; | |
3055 | ||
3056 | if (dev->ops->mmap) | |
3057 | return dev->ops->mmap(dev, vma); | |
3058 | ||
3059 | return -ENODEV; | |
3060 | } | |
3061 | ||
852b6d57 SW |
3062 | static int kvm_device_ioctl_attr(struct kvm_device *dev, |
3063 | int (*accessor)(struct kvm_device *dev, | |
3064 | struct kvm_device_attr *attr), | |
3065 | unsigned long arg) | |
3066 | { | |
3067 | struct kvm_device_attr attr; | |
3068 | ||
3069 | if (!accessor) | |
3070 | return -EPERM; | |
3071 | ||
3072 | if (copy_from_user(&attr, (void __user *)arg, sizeof(attr))) | |
3073 | return -EFAULT; | |
3074 | ||
3075 | return accessor(dev, &attr); | |
3076 | } | |
3077 | ||
3078 | static long kvm_device_ioctl(struct file *filp, unsigned int ioctl, | |
3079 | unsigned long arg) | |
3080 | { | |
3081 | struct kvm_device *dev = filp->private_data; | |
3082 | ||
ddba9180 SC |
3083 | if (dev->kvm->mm != current->mm) |
3084 | return -EIO; | |
3085 | ||
852b6d57 SW |
3086 | switch (ioctl) { |
3087 | case KVM_SET_DEVICE_ATTR: | |
3088 | return kvm_device_ioctl_attr(dev, dev->ops->set_attr, arg); | |
3089 | case KVM_GET_DEVICE_ATTR: | |
3090 | return kvm_device_ioctl_attr(dev, dev->ops->get_attr, arg); | |
3091 | case KVM_HAS_DEVICE_ATTR: | |
3092 | return kvm_device_ioctl_attr(dev, dev->ops->has_attr, arg); | |
3093 | default: | |
3094 | if (dev->ops->ioctl) | |
3095 | return dev->ops->ioctl(dev, ioctl, arg); | |
3096 | ||
3097 | return -ENOTTY; | |
3098 | } | |
3099 | } | |
3100 | ||
852b6d57 SW |
3101 | static int kvm_device_release(struct inode *inode, struct file *filp) |
3102 | { | |
3103 | struct kvm_device *dev = filp->private_data; | |
3104 | struct kvm *kvm = dev->kvm; | |
3105 | ||
2bde9b3e CLG |
3106 | if (dev->ops->release) { |
3107 | mutex_lock(&kvm->lock); | |
3108 | list_del(&dev->vm_node); | |
3109 | dev->ops->release(dev); | |
3110 | mutex_unlock(&kvm->lock); | |
3111 | } | |
3112 | ||
852b6d57 SW |
3113 | kvm_put_kvm(kvm); |
3114 | return 0; | |
3115 | } | |
3116 | ||
3117 | static const struct file_operations kvm_device_fops = { | |
3118 | .unlocked_ioctl = kvm_device_ioctl, | |
3119 | .release = kvm_device_release, | |
7ddfd3e0 | 3120 | KVM_COMPAT(kvm_device_ioctl), |
a1cd3f08 | 3121 | .mmap = kvm_device_mmap, |
852b6d57 SW |
3122 | }; |
3123 | ||
3124 | struct kvm_device *kvm_device_from_filp(struct file *filp) | |
3125 | { | |
3126 | if (filp->f_op != &kvm_device_fops) | |
3127 | return NULL; | |
3128 | ||
3129 | return filp->private_data; | |
3130 | } | |
3131 | ||
8538cb22 | 3132 | static const struct kvm_device_ops *kvm_device_ops_table[KVM_DEV_TYPE_MAX] = { |
5df554ad | 3133 | #ifdef CONFIG_KVM_MPIC |
d60eacb0 WD |
3134 | [KVM_DEV_TYPE_FSL_MPIC_20] = &kvm_mpic_ops, |
3135 | [KVM_DEV_TYPE_FSL_MPIC_42] = &kvm_mpic_ops, | |
5975a2e0 | 3136 | #endif |
d60eacb0 WD |
3137 | }; |
3138 | ||
8538cb22 | 3139 | int kvm_register_device_ops(const struct kvm_device_ops *ops, u32 type) |
d60eacb0 WD |
3140 | { |
3141 | if (type >= ARRAY_SIZE(kvm_device_ops_table)) | |
3142 | return -ENOSPC; | |
3143 | ||
3144 | if (kvm_device_ops_table[type] != NULL) | |
3145 | return -EEXIST; | |
3146 | ||
3147 | kvm_device_ops_table[type] = ops; | |
3148 | return 0; | |
3149 | } | |
3150 | ||
571ee1b6 WL |
3151 | void kvm_unregister_device_ops(u32 type) |
3152 | { | |
3153 | if (kvm_device_ops_table[type] != NULL) | |
3154 | kvm_device_ops_table[type] = NULL; | |
3155 | } | |
3156 | ||
852b6d57 SW |
3157 | static int kvm_ioctl_create_device(struct kvm *kvm, |
3158 | struct kvm_create_device *cd) | |
3159 | { | |
8538cb22 | 3160 | const struct kvm_device_ops *ops = NULL; |
852b6d57 SW |
3161 | struct kvm_device *dev; |
3162 | bool test = cd->flags & KVM_CREATE_DEVICE_TEST; | |
1d487e9b | 3163 | int type; |
852b6d57 SW |
3164 | int ret; |
3165 | ||
d60eacb0 WD |
3166 | if (cd->type >= ARRAY_SIZE(kvm_device_ops_table)) |
3167 | return -ENODEV; | |
3168 | ||
1d487e9b PB |
3169 | type = array_index_nospec(cd->type, ARRAY_SIZE(kvm_device_ops_table)); |
3170 | ops = kvm_device_ops_table[type]; | |
d60eacb0 | 3171 | if (ops == NULL) |
852b6d57 | 3172 | return -ENODEV; |
852b6d57 SW |
3173 | |
3174 | if (test) | |
3175 | return 0; | |
3176 | ||
b12ce36a | 3177 | dev = kzalloc(sizeof(*dev), GFP_KERNEL_ACCOUNT); |
852b6d57 SW |
3178 | if (!dev) |
3179 | return -ENOMEM; | |
3180 | ||
3181 | dev->ops = ops; | |
3182 | dev->kvm = kvm; | |
852b6d57 | 3183 | |
a28ebea2 | 3184 | mutex_lock(&kvm->lock); |
1d487e9b | 3185 | ret = ops->create(dev, type); |
852b6d57 | 3186 | if (ret < 0) { |
a28ebea2 | 3187 | mutex_unlock(&kvm->lock); |
852b6d57 SW |
3188 | kfree(dev); |
3189 | return ret; | |
3190 | } | |
a28ebea2 CD |
3191 | list_add(&dev->vm_node, &kvm->devices); |
3192 | mutex_unlock(&kvm->lock); | |
852b6d57 | 3193 | |
023e9fdd CD |
3194 | if (ops->init) |
3195 | ops->init(dev); | |
3196 | ||
cfa39381 | 3197 | kvm_get_kvm(kvm); |
24009b05 | 3198 | ret = anon_inode_getfd(ops->name, &kvm_device_fops, dev, O_RDWR | O_CLOEXEC); |
852b6d57 | 3199 | if (ret < 0) { |
149487bd | 3200 | kvm_put_kvm_no_destroy(kvm); |
a28ebea2 CD |
3201 | mutex_lock(&kvm->lock); |
3202 | list_del(&dev->vm_node); | |
3203 | mutex_unlock(&kvm->lock); | |
a0f1d21c | 3204 | ops->destroy(dev); |
852b6d57 SW |
3205 | return ret; |
3206 | } | |
3207 | ||
852b6d57 SW |
3208 | cd->fd = ret; |
3209 | return 0; | |
3210 | } | |
3211 | ||
92b591a4 AG |
3212 | static long kvm_vm_ioctl_check_extension_generic(struct kvm *kvm, long arg) |
3213 | { | |
3214 | switch (arg) { | |
3215 | case KVM_CAP_USER_MEMORY: | |
3216 | case KVM_CAP_DESTROY_MEMORY_REGION_WORKS: | |
3217 | case KVM_CAP_JOIN_MEMORY_REGIONS_WORKS: | |
92b591a4 AG |
3218 | case KVM_CAP_INTERNAL_ERROR_DATA: |
3219 | #ifdef CONFIG_HAVE_KVM_MSI | |
3220 | case KVM_CAP_SIGNAL_MSI: | |
3221 | #endif | |
297e2105 | 3222 | #ifdef CONFIG_HAVE_KVM_IRQFD |
dc9be0fa | 3223 | case KVM_CAP_IRQFD: |
92b591a4 AG |
3224 | case KVM_CAP_IRQFD_RESAMPLE: |
3225 | #endif | |
e9ea5069 | 3226 | case KVM_CAP_IOEVENTFD_ANY_LENGTH: |
92b591a4 | 3227 | case KVM_CAP_CHECK_EXTENSION_VM: |
e5d83c74 | 3228 | case KVM_CAP_ENABLE_CAP_VM: |
2a31b9db | 3229 | #ifdef CONFIG_KVM_GENERIC_DIRTYLOG_READ_PROTECT |
d7547c55 | 3230 | case KVM_CAP_MANUAL_DIRTY_LOG_PROTECT2: |
2a31b9db | 3231 | #endif |
92b591a4 | 3232 | return 1; |
4b4357e0 | 3233 | #ifdef CONFIG_KVM_MMIO |
30422558 PB |
3234 | case KVM_CAP_COALESCED_MMIO: |
3235 | return KVM_COALESCED_MMIO_PAGE_OFFSET; | |
0804c849 PH |
3236 | case KVM_CAP_COALESCED_PIO: |
3237 | return 1; | |
30422558 | 3238 | #endif |
92b591a4 AG |
3239 | #ifdef CONFIG_HAVE_KVM_IRQ_ROUTING |
3240 | case KVM_CAP_IRQ_ROUTING: | |
3241 | return KVM_MAX_IRQ_ROUTES; | |
f481b069 PB |
3242 | #endif |
3243 | #if KVM_ADDRESS_SPACE_NUM > 1 | |
3244 | case KVM_CAP_MULTI_ADDRESS_SPACE: | |
3245 | return KVM_ADDRESS_SPACE_NUM; | |
92b591a4 | 3246 | #endif |
c110ae57 PB |
3247 | case KVM_CAP_NR_MEMSLOTS: |
3248 | return KVM_USER_MEM_SLOTS; | |
92b591a4 AG |
3249 | default: |
3250 | break; | |
3251 | } | |
3252 | return kvm_vm_ioctl_check_extension(kvm, arg); | |
3253 | } | |
3254 | ||
e5d83c74 PB |
3255 | int __attribute__((weak)) kvm_vm_ioctl_enable_cap(struct kvm *kvm, |
3256 | struct kvm_enable_cap *cap) | |
3257 | { | |
3258 | return -EINVAL; | |
3259 | } | |
3260 | ||
3261 | static int kvm_vm_ioctl_enable_cap_generic(struct kvm *kvm, | |
3262 | struct kvm_enable_cap *cap) | |
3263 | { | |
3264 | switch (cap->cap) { | |
2a31b9db | 3265 | #ifdef CONFIG_KVM_GENERIC_DIRTYLOG_READ_PROTECT |
d7547c55 | 3266 | case KVM_CAP_MANUAL_DIRTY_LOG_PROTECT2: |
2a31b9db PB |
3267 | if (cap->flags || (cap->args[0] & ~1)) |
3268 | return -EINVAL; | |
3269 | kvm->manual_dirty_log_protect = cap->args[0]; | |
3270 | return 0; | |
3271 | #endif | |
e5d83c74 PB |
3272 | default: |
3273 | return kvm_vm_ioctl_enable_cap(kvm, cap); | |
3274 | } | |
3275 | } | |
3276 | ||
bccf2150 AK |
3277 | static long kvm_vm_ioctl(struct file *filp, |
3278 | unsigned int ioctl, unsigned long arg) | |
3279 | { | |
3280 | struct kvm *kvm = filp->private_data; | |
3281 | void __user *argp = (void __user *)arg; | |
1fe779f8 | 3282 | int r; |
bccf2150 | 3283 | |
6d4e4c4f AK |
3284 | if (kvm->mm != current->mm) |
3285 | return -EIO; | |
bccf2150 AK |
3286 | switch (ioctl) { |
3287 | case KVM_CREATE_VCPU: | |
3288 | r = kvm_vm_ioctl_create_vcpu(kvm, arg); | |
bccf2150 | 3289 | break; |
e5d83c74 PB |
3290 | case KVM_ENABLE_CAP: { |
3291 | struct kvm_enable_cap cap; | |
3292 | ||
3293 | r = -EFAULT; | |
3294 | if (copy_from_user(&cap, argp, sizeof(cap))) | |
3295 | goto out; | |
3296 | r = kvm_vm_ioctl_enable_cap_generic(kvm, &cap); | |
3297 | break; | |
3298 | } | |
6fc138d2 IE |
3299 | case KVM_SET_USER_MEMORY_REGION: { |
3300 | struct kvm_userspace_memory_region kvm_userspace_mem; | |
3301 | ||
3302 | r = -EFAULT; | |
3303 | if (copy_from_user(&kvm_userspace_mem, argp, | |
893bdbf1 | 3304 | sizeof(kvm_userspace_mem))) |
6fc138d2 IE |
3305 | goto out; |
3306 | ||
47ae31e2 | 3307 | r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_userspace_mem); |
6aa8b732 AK |
3308 | break; |
3309 | } | |
3310 | case KVM_GET_DIRTY_LOG: { | |
3311 | struct kvm_dirty_log log; | |
3312 | ||
3313 | r = -EFAULT; | |
893bdbf1 | 3314 | if (copy_from_user(&log, argp, sizeof(log))) |
6aa8b732 | 3315 | goto out; |
2c6f5df9 | 3316 | r = kvm_vm_ioctl_get_dirty_log(kvm, &log); |
6aa8b732 AK |
3317 | break; |
3318 | } | |
2a31b9db PB |
3319 | #ifdef CONFIG_KVM_GENERIC_DIRTYLOG_READ_PROTECT |
3320 | case KVM_CLEAR_DIRTY_LOG: { | |
3321 | struct kvm_clear_dirty_log log; | |
3322 | ||
3323 | r = -EFAULT; | |
3324 | if (copy_from_user(&log, argp, sizeof(log))) | |
3325 | goto out; | |
3326 | r = kvm_vm_ioctl_clear_dirty_log(kvm, &log); | |
3327 | break; | |
3328 | } | |
3329 | #endif | |
4b4357e0 | 3330 | #ifdef CONFIG_KVM_MMIO |
5f94c174 LV |
3331 | case KVM_REGISTER_COALESCED_MMIO: { |
3332 | struct kvm_coalesced_mmio_zone zone; | |
f95ef0cd | 3333 | |
5f94c174 | 3334 | r = -EFAULT; |
893bdbf1 | 3335 | if (copy_from_user(&zone, argp, sizeof(zone))) |
5f94c174 | 3336 | goto out; |
5f94c174 | 3337 | r = kvm_vm_ioctl_register_coalesced_mmio(kvm, &zone); |
5f94c174 LV |
3338 | break; |
3339 | } | |
3340 | case KVM_UNREGISTER_COALESCED_MMIO: { | |
3341 | struct kvm_coalesced_mmio_zone zone; | |
f95ef0cd | 3342 | |
5f94c174 | 3343 | r = -EFAULT; |
893bdbf1 | 3344 | if (copy_from_user(&zone, argp, sizeof(zone))) |
5f94c174 | 3345 | goto out; |
5f94c174 | 3346 | r = kvm_vm_ioctl_unregister_coalesced_mmio(kvm, &zone); |
5f94c174 LV |
3347 | break; |
3348 | } | |
3349 | #endif | |
721eecbf GH |
3350 | case KVM_IRQFD: { |
3351 | struct kvm_irqfd data; | |
3352 | ||
3353 | r = -EFAULT; | |
893bdbf1 | 3354 | if (copy_from_user(&data, argp, sizeof(data))) |
721eecbf | 3355 | goto out; |
d4db2935 | 3356 | r = kvm_irqfd(kvm, &data); |
721eecbf GH |
3357 | break; |
3358 | } | |
d34e6b17 GH |
3359 | case KVM_IOEVENTFD: { |
3360 | struct kvm_ioeventfd data; | |
3361 | ||
3362 | r = -EFAULT; | |
893bdbf1 | 3363 | if (copy_from_user(&data, argp, sizeof(data))) |
d34e6b17 GH |
3364 | goto out; |
3365 | r = kvm_ioeventfd(kvm, &data); | |
3366 | break; | |
3367 | } | |
07975ad3 JK |
3368 | #ifdef CONFIG_HAVE_KVM_MSI |
3369 | case KVM_SIGNAL_MSI: { | |
3370 | struct kvm_msi msi; | |
3371 | ||
3372 | r = -EFAULT; | |
893bdbf1 | 3373 | if (copy_from_user(&msi, argp, sizeof(msi))) |
07975ad3 JK |
3374 | goto out; |
3375 | r = kvm_send_userspace_msi(kvm, &msi); | |
3376 | break; | |
3377 | } | |
23d43cf9 CD |
3378 | #endif |
3379 | #ifdef __KVM_HAVE_IRQ_LINE | |
3380 | case KVM_IRQ_LINE_STATUS: | |
3381 | case KVM_IRQ_LINE: { | |
3382 | struct kvm_irq_level irq_event; | |
3383 | ||
3384 | r = -EFAULT; | |
893bdbf1 | 3385 | if (copy_from_user(&irq_event, argp, sizeof(irq_event))) |
23d43cf9 CD |
3386 | goto out; |
3387 | ||
aa2fbe6d YZ |
3388 | r = kvm_vm_ioctl_irq_line(kvm, &irq_event, |
3389 | ioctl == KVM_IRQ_LINE_STATUS); | |
23d43cf9 CD |
3390 | if (r) |
3391 | goto out; | |
3392 | ||
3393 | r = -EFAULT; | |
3394 | if (ioctl == KVM_IRQ_LINE_STATUS) { | |
893bdbf1 | 3395 | if (copy_to_user(argp, &irq_event, sizeof(irq_event))) |
23d43cf9 CD |
3396 | goto out; |
3397 | } | |
3398 | ||
3399 | r = 0; | |
3400 | break; | |
3401 | } | |
73880c80 | 3402 | #endif |
aa8d5944 AG |
3403 | #ifdef CONFIG_HAVE_KVM_IRQ_ROUTING |
3404 | case KVM_SET_GSI_ROUTING: { | |
3405 | struct kvm_irq_routing routing; | |
3406 | struct kvm_irq_routing __user *urouting; | |
f8c1b85b | 3407 | struct kvm_irq_routing_entry *entries = NULL; |
aa8d5944 AG |
3408 | |
3409 | r = -EFAULT; | |
3410 | if (copy_from_user(&routing, argp, sizeof(routing))) | |
3411 | goto out; | |
3412 | r = -EINVAL; | |
5c0aea0e DH |
3413 | if (!kvm_arch_can_set_irq_routing(kvm)) |
3414 | goto out; | |
caf1ff26 | 3415 | if (routing.nr > KVM_MAX_IRQ_ROUTES) |
aa8d5944 AG |
3416 | goto out; |
3417 | if (routing.flags) | |
3418 | goto out; | |
f8c1b85b PB |
3419 | if (routing.nr) { |
3420 | r = -ENOMEM; | |
42bc47b3 KC |
3421 | entries = vmalloc(array_size(sizeof(*entries), |
3422 | routing.nr)); | |
f8c1b85b PB |
3423 | if (!entries) |
3424 | goto out; | |
3425 | r = -EFAULT; | |
3426 | urouting = argp; | |
3427 | if (copy_from_user(entries, urouting->entries, | |
3428 | routing.nr * sizeof(*entries))) | |
3429 | goto out_free_irq_routing; | |
3430 | } | |
aa8d5944 AG |
3431 | r = kvm_set_irq_routing(kvm, entries, routing.nr, |
3432 | routing.flags); | |
a642a175 | 3433 | out_free_irq_routing: |
aa8d5944 AG |
3434 | vfree(entries); |
3435 | break; | |
3436 | } | |
3437 | #endif /* CONFIG_HAVE_KVM_IRQ_ROUTING */ | |
852b6d57 SW |
3438 | case KVM_CREATE_DEVICE: { |
3439 | struct kvm_create_device cd; | |
3440 | ||
3441 | r = -EFAULT; | |
3442 | if (copy_from_user(&cd, argp, sizeof(cd))) | |
3443 | goto out; | |
3444 | ||
3445 | r = kvm_ioctl_create_device(kvm, &cd); | |
3446 | if (r) | |
3447 | goto out; | |
3448 | ||
3449 | r = -EFAULT; | |
3450 | if (copy_to_user(argp, &cd, sizeof(cd))) | |
3451 | goto out; | |
3452 | ||
3453 | r = 0; | |
3454 | break; | |
3455 | } | |
92b591a4 AG |
3456 | case KVM_CHECK_EXTENSION: |
3457 | r = kvm_vm_ioctl_check_extension_generic(kvm, arg); | |
3458 | break; | |
f17abe9a | 3459 | default: |
1fe779f8 | 3460 | r = kvm_arch_vm_ioctl(filp, ioctl, arg); |
f17abe9a AK |
3461 | } |
3462 | out: | |
3463 | return r; | |
3464 | } | |
3465 | ||
de8e5d74 | 3466 | #ifdef CONFIG_KVM_COMPAT |
6ff5894c AB |
3467 | struct compat_kvm_dirty_log { |
3468 | __u32 slot; | |
3469 | __u32 padding1; | |
3470 | union { | |
3471 | compat_uptr_t dirty_bitmap; /* one bit per page */ | |
3472 | __u64 padding2; | |
3473 | }; | |
3474 | }; | |
3475 | ||
3476 | static long kvm_vm_compat_ioctl(struct file *filp, | |
3477 | unsigned int ioctl, unsigned long arg) | |
3478 | { | |
3479 | struct kvm *kvm = filp->private_data; | |
3480 | int r; | |
3481 | ||
3482 | if (kvm->mm != current->mm) | |
3483 | return -EIO; | |
3484 | switch (ioctl) { | |
3485 | case KVM_GET_DIRTY_LOG: { | |
3486 | struct compat_kvm_dirty_log compat_log; | |
3487 | struct kvm_dirty_log log; | |
3488 | ||
6ff5894c AB |
3489 | if (copy_from_user(&compat_log, (void __user *)arg, |
3490 | sizeof(compat_log))) | |
f6a3b168 | 3491 | return -EFAULT; |
6ff5894c AB |
3492 | log.slot = compat_log.slot; |
3493 | log.padding1 = compat_log.padding1; | |
3494 | log.padding2 = compat_log.padding2; | |
3495 | log.dirty_bitmap = compat_ptr(compat_log.dirty_bitmap); | |
3496 | ||
3497 | r = kvm_vm_ioctl_get_dirty_log(kvm, &log); | |
6ff5894c AB |
3498 | break; |
3499 | } | |
3500 | default: | |
3501 | r = kvm_vm_ioctl(filp, ioctl, arg); | |
3502 | } | |
6ff5894c AB |
3503 | return r; |
3504 | } | |
3505 | #endif | |
3506 | ||
3d3aab1b | 3507 | static struct file_operations kvm_vm_fops = { |
f17abe9a AK |
3508 | .release = kvm_vm_release, |
3509 | .unlocked_ioctl = kvm_vm_ioctl, | |
6038f373 | 3510 | .llseek = noop_llseek, |
7ddfd3e0 | 3511 | KVM_COMPAT(kvm_vm_compat_ioctl), |
f17abe9a AK |
3512 | }; |
3513 | ||
e08b9637 | 3514 | static int kvm_dev_ioctl_create_vm(unsigned long type) |
f17abe9a | 3515 | { |
aac87636 | 3516 | int r; |
f17abe9a | 3517 | struct kvm *kvm; |
506cfba9 | 3518 | struct file *file; |
f17abe9a | 3519 | |
e08b9637 | 3520 | kvm = kvm_create_vm(type); |
d6d28168 AK |
3521 | if (IS_ERR(kvm)) |
3522 | return PTR_ERR(kvm); | |
4b4357e0 | 3523 | #ifdef CONFIG_KVM_MMIO |
6ce5a090 | 3524 | r = kvm_coalesced_mmio_init(kvm); |
78588335 ME |
3525 | if (r < 0) |
3526 | goto put_kvm; | |
6ce5a090 | 3527 | #endif |
506cfba9 | 3528 | r = get_unused_fd_flags(O_CLOEXEC); |
78588335 ME |
3529 | if (r < 0) |
3530 | goto put_kvm; | |
3531 | ||
506cfba9 AV |
3532 | file = anon_inode_getfile("kvm-vm", &kvm_vm_fops, kvm, O_RDWR); |
3533 | if (IS_ERR(file)) { | |
3534 | put_unused_fd(r); | |
78588335 ME |
3535 | r = PTR_ERR(file); |
3536 | goto put_kvm; | |
506cfba9 | 3537 | } |
536a6f88 | 3538 | |
525df861 PB |
3539 | /* |
3540 | * Don't call kvm_put_kvm anymore at this point; file->f_op is | |
3541 | * already set, with ->release() being kvm_vm_release(). In error | |
3542 | * cases it will be called by the final fput(file) and will take | |
3543 | * care of doing kvm_put_kvm(kvm). | |
3544 | */ | |
536a6f88 | 3545 | if (kvm_create_vm_debugfs(kvm, r) < 0) { |
506cfba9 AV |
3546 | put_unused_fd(r); |
3547 | fput(file); | |
536a6f88 JF |
3548 | return -ENOMEM; |
3549 | } | |
286de8f6 | 3550 | kvm_uevent_notify_change(KVM_EVENT_CREATE_VM, kvm); |
f17abe9a | 3551 | |
506cfba9 | 3552 | fd_install(r, file); |
aac87636 | 3553 | return r; |
78588335 ME |
3554 | |
3555 | put_kvm: | |
3556 | kvm_put_kvm(kvm); | |
3557 | return r; | |
f17abe9a AK |
3558 | } |
3559 | ||
3560 | static long kvm_dev_ioctl(struct file *filp, | |
3561 | unsigned int ioctl, unsigned long arg) | |
3562 | { | |
07c45a36 | 3563 | long r = -EINVAL; |
f17abe9a AK |
3564 | |
3565 | switch (ioctl) { | |
3566 | case KVM_GET_API_VERSION: | |
f0fe5108 AK |
3567 | if (arg) |
3568 | goto out; | |
f17abe9a AK |
3569 | r = KVM_API_VERSION; |
3570 | break; | |
3571 | case KVM_CREATE_VM: | |
e08b9637 | 3572 | r = kvm_dev_ioctl_create_vm(arg); |
f17abe9a | 3573 | break; |
018d00d2 | 3574 | case KVM_CHECK_EXTENSION: |
784aa3d7 | 3575 | r = kvm_vm_ioctl_check_extension_generic(NULL, arg); |
5d308f45 | 3576 | break; |
07c45a36 | 3577 | case KVM_GET_VCPU_MMAP_SIZE: |
07c45a36 AK |
3578 | if (arg) |
3579 | goto out; | |
adb1ff46 AK |
3580 | r = PAGE_SIZE; /* struct kvm_run */ |
3581 | #ifdef CONFIG_X86 | |
3582 | r += PAGE_SIZE; /* pio data page */ | |
5f94c174 | 3583 | #endif |
4b4357e0 | 3584 | #ifdef CONFIG_KVM_MMIO |
5f94c174 | 3585 | r += PAGE_SIZE; /* coalesced mmio ring page */ |
adb1ff46 | 3586 | #endif |
07c45a36 | 3587 | break; |
d4c9ff2d FEL |
3588 | case KVM_TRACE_ENABLE: |
3589 | case KVM_TRACE_PAUSE: | |
3590 | case KVM_TRACE_DISABLE: | |
2023a29c | 3591 | r = -EOPNOTSUPP; |
d4c9ff2d | 3592 | break; |
6aa8b732 | 3593 | default: |
043405e1 | 3594 | return kvm_arch_dev_ioctl(filp, ioctl, arg); |
6aa8b732 AK |
3595 | } |
3596 | out: | |
3597 | return r; | |
3598 | } | |
3599 | ||
6aa8b732 | 3600 | static struct file_operations kvm_chardev_ops = { |
6aa8b732 | 3601 | .unlocked_ioctl = kvm_dev_ioctl, |
6038f373 | 3602 | .llseek = noop_llseek, |
7ddfd3e0 | 3603 | KVM_COMPAT(kvm_dev_ioctl), |
6aa8b732 AK |
3604 | }; |
3605 | ||
3606 | static struct miscdevice kvm_dev = { | |
bbe4432e | 3607 | KVM_MINOR, |
6aa8b732 AK |
3608 | "kvm", |
3609 | &kvm_chardev_ops, | |
3610 | }; | |
3611 | ||
75b7127c | 3612 | static void hardware_enable_nolock(void *junk) |
1b6c0168 AK |
3613 | { |
3614 | int cpu = raw_smp_processor_id(); | |
10474ae8 | 3615 | int r; |
1b6c0168 | 3616 | |
7f59f492 | 3617 | if (cpumask_test_cpu(cpu, cpus_hardware_enabled)) |
1b6c0168 | 3618 | return; |
10474ae8 | 3619 | |
7f59f492 | 3620 | cpumask_set_cpu(cpu, cpus_hardware_enabled); |
10474ae8 | 3621 | |
13a34e06 | 3622 | r = kvm_arch_hardware_enable(); |
10474ae8 AG |
3623 | |
3624 | if (r) { | |
3625 | cpumask_clear_cpu(cpu, cpus_hardware_enabled); | |
3626 | atomic_inc(&hardware_enable_failed); | |
1170adc6 | 3627 | pr_info("kvm: enabling virtualization on CPU%d failed\n", cpu); |
10474ae8 | 3628 | } |
1b6c0168 AK |
3629 | } |
3630 | ||
8c18b2d2 | 3631 | static int kvm_starting_cpu(unsigned int cpu) |
75b7127c | 3632 | { |
4a937f96 | 3633 | raw_spin_lock(&kvm_count_lock); |
4fa92fb2 PB |
3634 | if (kvm_usage_count) |
3635 | hardware_enable_nolock(NULL); | |
4a937f96 | 3636 | raw_spin_unlock(&kvm_count_lock); |
8c18b2d2 | 3637 | return 0; |
75b7127c TY |
3638 | } |
3639 | ||
3640 | static void hardware_disable_nolock(void *junk) | |
1b6c0168 AK |
3641 | { |
3642 | int cpu = raw_smp_processor_id(); | |
3643 | ||
7f59f492 | 3644 | if (!cpumask_test_cpu(cpu, cpus_hardware_enabled)) |
1b6c0168 | 3645 | return; |
7f59f492 | 3646 | cpumask_clear_cpu(cpu, cpus_hardware_enabled); |
13a34e06 | 3647 | kvm_arch_hardware_disable(); |
1b6c0168 AK |
3648 | } |
3649 | ||
8c18b2d2 | 3650 | static int kvm_dying_cpu(unsigned int cpu) |
75b7127c | 3651 | { |
4a937f96 | 3652 | raw_spin_lock(&kvm_count_lock); |
4fa92fb2 PB |
3653 | if (kvm_usage_count) |
3654 | hardware_disable_nolock(NULL); | |
4a937f96 | 3655 | raw_spin_unlock(&kvm_count_lock); |
8c18b2d2 | 3656 | return 0; |
75b7127c TY |
3657 | } |
3658 | ||
10474ae8 AG |
3659 | static void hardware_disable_all_nolock(void) |
3660 | { | |
3661 | BUG_ON(!kvm_usage_count); | |
3662 | ||
3663 | kvm_usage_count--; | |
3664 | if (!kvm_usage_count) | |
75b7127c | 3665 | on_each_cpu(hardware_disable_nolock, NULL, 1); |
10474ae8 AG |
3666 | } |
3667 | ||
3668 | static void hardware_disable_all(void) | |
3669 | { | |
4a937f96 | 3670 | raw_spin_lock(&kvm_count_lock); |
10474ae8 | 3671 | hardware_disable_all_nolock(); |
4a937f96 | 3672 | raw_spin_unlock(&kvm_count_lock); |
10474ae8 AG |
3673 | } |
3674 | ||
3675 | static int hardware_enable_all(void) | |
3676 | { | |
3677 | int r = 0; | |
3678 | ||
4a937f96 | 3679 | raw_spin_lock(&kvm_count_lock); |
10474ae8 AG |
3680 | |
3681 | kvm_usage_count++; | |
3682 | if (kvm_usage_count == 1) { | |
3683 | atomic_set(&hardware_enable_failed, 0); | |
75b7127c | 3684 | on_each_cpu(hardware_enable_nolock, NULL, 1); |
10474ae8 AG |
3685 | |
3686 | if (atomic_read(&hardware_enable_failed)) { | |
3687 | hardware_disable_all_nolock(); | |
3688 | r = -EBUSY; | |
3689 | } | |
3690 | } | |
3691 | ||
4a937f96 | 3692 | raw_spin_unlock(&kvm_count_lock); |
10474ae8 AG |
3693 | |
3694 | return r; | |
3695 | } | |
3696 | ||
9a2b85c6 | 3697 | static int kvm_reboot(struct notifier_block *notifier, unsigned long val, |
d77c26fc | 3698 | void *v) |
9a2b85c6 | 3699 | { |
8e1c1815 SY |
3700 | /* |
3701 | * Some (well, at least mine) BIOSes hang on reboot if | |
3702 | * in vmx root mode. | |
3703 | * | |
3704 | * And Intel TXT required VMX off for all cpu when system shutdown. | |
3705 | */ | |
1170adc6 | 3706 | pr_info("kvm: exiting hardware virtualization\n"); |
8e1c1815 | 3707 | kvm_rebooting = true; |
75b7127c | 3708 | on_each_cpu(hardware_disable_nolock, NULL, 1); |
9a2b85c6 RR |
3709 | return NOTIFY_OK; |
3710 | } | |
3711 | ||
3712 | static struct notifier_block kvm_reboot_notifier = { | |
3713 | .notifier_call = kvm_reboot, | |
3714 | .priority = 0, | |
3715 | }; | |
3716 | ||
e93f8a0f | 3717 | static void kvm_io_bus_destroy(struct kvm_io_bus *bus) |
2eeb2e94 GH |
3718 | { |
3719 | int i; | |
3720 | ||
3721 | for (i = 0; i < bus->dev_count; i++) { | |
743eeb0b | 3722 | struct kvm_io_device *pos = bus->range[i].dev; |
2eeb2e94 GH |
3723 | |
3724 | kvm_iodevice_destructor(pos); | |
3725 | } | |
e93f8a0f | 3726 | kfree(bus); |
2eeb2e94 GH |
3727 | } |
3728 | ||
c21fbff1 | 3729 | static inline int kvm_io_bus_cmp(const struct kvm_io_range *r1, |
20e87b72 | 3730 | const struct kvm_io_range *r2) |
743eeb0b | 3731 | { |
8f4216c7 JW |
3732 | gpa_t addr1 = r1->addr; |
3733 | gpa_t addr2 = r2->addr; | |
3734 | ||
3735 | if (addr1 < addr2) | |
743eeb0b | 3736 | return -1; |
8f4216c7 JW |
3737 | |
3738 | /* If r2->len == 0, match the exact address. If r2->len != 0, | |
3739 | * accept any overlapping write. Any order is acceptable for | |
3740 | * overlapping ranges, because kvm_io_bus_get_first_dev ensures | |
3741 | * we process all of them. | |
3742 | */ | |
3743 | if (r2->len) { | |
3744 | addr1 += r1->len; | |
3745 | addr2 += r2->len; | |
3746 | } | |
3747 | ||
3748 | if (addr1 > addr2) | |
743eeb0b | 3749 | return 1; |
8f4216c7 | 3750 | |
743eeb0b SL |
3751 | return 0; |
3752 | } | |
3753 | ||
a343c9b7 PB |
3754 | static int kvm_io_bus_sort_cmp(const void *p1, const void *p2) |
3755 | { | |
c21fbff1 | 3756 | return kvm_io_bus_cmp(p1, p2); |
a343c9b7 PB |
3757 | } |
3758 | ||
39369f7a | 3759 | static int kvm_io_bus_get_first_dev(struct kvm_io_bus *bus, |
743eeb0b SL |
3760 | gpa_t addr, int len) |
3761 | { | |
3762 | struct kvm_io_range *range, key; | |
3763 | int off; | |
3764 | ||
3765 | key = (struct kvm_io_range) { | |
3766 | .addr = addr, | |
3767 | .len = len, | |
3768 | }; | |
3769 | ||
3770 | range = bsearch(&key, bus->range, bus->dev_count, | |
3771 | sizeof(struct kvm_io_range), kvm_io_bus_sort_cmp); | |
3772 | if (range == NULL) | |
3773 | return -ENOENT; | |
3774 | ||
3775 | off = range - bus->range; | |
3776 | ||
c21fbff1 | 3777 | while (off > 0 && kvm_io_bus_cmp(&key, &bus->range[off-1]) == 0) |
743eeb0b SL |
3778 | off--; |
3779 | ||
3780 | return off; | |
3781 | } | |
3782 | ||
e32edf4f | 3783 | static int __kvm_io_bus_write(struct kvm_vcpu *vcpu, struct kvm_io_bus *bus, |
126a5af5 CH |
3784 | struct kvm_io_range *range, const void *val) |
3785 | { | |
3786 | int idx; | |
3787 | ||
3788 | idx = kvm_io_bus_get_first_dev(bus, range->addr, range->len); | |
3789 | if (idx < 0) | |
3790 | return -EOPNOTSUPP; | |
3791 | ||
3792 | while (idx < bus->dev_count && | |
c21fbff1 | 3793 | kvm_io_bus_cmp(range, &bus->range[idx]) == 0) { |
e32edf4f | 3794 | if (!kvm_iodevice_write(vcpu, bus->range[idx].dev, range->addr, |
126a5af5 CH |
3795 | range->len, val)) |
3796 | return idx; | |
3797 | idx++; | |
3798 | } | |
3799 | ||
3800 | return -EOPNOTSUPP; | |
3801 | } | |
3802 | ||
bda9020e | 3803 | /* kvm_io_bus_write - called under kvm->slots_lock */ |
e32edf4f | 3804 | int kvm_io_bus_write(struct kvm_vcpu *vcpu, enum kvm_bus bus_idx, gpa_t addr, |
bda9020e | 3805 | int len, const void *val) |
2eeb2e94 | 3806 | { |
90d83dc3 | 3807 | struct kvm_io_bus *bus; |
743eeb0b | 3808 | struct kvm_io_range range; |
126a5af5 | 3809 | int r; |
743eeb0b SL |
3810 | |
3811 | range = (struct kvm_io_range) { | |
3812 | .addr = addr, | |
3813 | .len = len, | |
3814 | }; | |
90d83dc3 | 3815 | |
e32edf4f | 3816 | bus = srcu_dereference(vcpu->kvm->buses[bus_idx], &vcpu->kvm->srcu); |
90db1043 DH |
3817 | if (!bus) |
3818 | return -ENOMEM; | |
e32edf4f | 3819 | r = __kvm_io_bus_write(vcpu, bus, &range, val); |
126a5af5 CH |
3820 | return r < 0 ? r : 0; |
3821 | } | |
a2420107 | 3822 | EXPORT_SYMBOL_GPL(kvm_io_bus_write); |
126a5af5 CH |
3823 | |
3824 | /* kvm_io_bus_write_cookie - called under kvm->slots_lock */ | |
e32edf4f NN |
3825 | int kvm_io_bus_write_cookie(struct kvm_vcpu *vcpu, enum kvm_bus bus_idx, |
3826 | gpa_t addr, int len, const void *val, long cookie) | |
126a5af5 CH |
3827 | { |
3828 | struct kvm_io_bus *bus; | |
3829 | struct kvm_io_range range; | |
3830 | ||
3831 | range = (struct kvm_io_range) { | |
3832 | .addr = addr, | |
3833 | .len = len, | |
3834 | }; | |
3835 | ||
e32edf4f | 3836 | bus = srcu_dereference(vcpu->kvm->buses[bus_idx], &vcpu->kvm->srcu); |
90db1043 DH |
3837 | if (!bus) |
3838 | return -ENOMEM; | |
126a5af5 CH |
3839 | |
3840 | /* First try the device referenced by cookie. */ | |
3841 | if ((cookie >= 0) && (cookie < bus->dev_count) && | |
c21fbff1 | 3842 | (kvm_io_bus_cmp(&range, &bus->range[cookie]) == 0)) |
e32edf4f | 3843 | if (!kvm_iodevice_write(vcpu, bus->range[cookie].dev, addr, len, |
126a5af5 CH |
3844 | val)) |
3845 | return cookie; | |
3846 | ||
3847 | /* | |
3848 | * cookie contained garbage; fall back to search and return the | |
3849 | * correct cookie value. | |
3850 | */ | |
e32edf4f | 3851 | return __kvm_io_bus_write(vcpu, bus, &range, val); |
126a5af5 CH |
3852 | } |
3853 | ||
e32edf4f NN |
3854 | static int __kvm_io_bus_read(struct kvm_vcpu *vcpu, struct kvm_io_bus *bus, |
3855 | struct kvm_io_range *range, void *val) | |
126a5af5 CH |
3856 | { |
3857 | int idx; | |
3858 | ||
3859 | idx = kvm_io_bus_get_first_dev(bus, range->addr, range->len); | |
743eeb0b SL |
3860 | if (idx < 0) |
3861 | return -EOPNOTSUPP; | |
3862 | ||
3863 | while (idx < bus->dev_count && | |
c21fbff1 | 3864 | kvm_io_bus_cmp(range, &bus->range[idx]) == 0) { |
e32edf4f | 3865 | if (!kvm_iodevice_read(vcpu, bus->range[idx].dev, range->addr, |
126a5af5 CH |
3866 | range->len, val)) |
3867 | return idx; | |
743eeb0b SL |
3868 | idx++; |
3869 | } | |
3870 | ||
bda9020e MT |
3871 | return -EOPNOTSUPP; |
3872 | } | |
2eeb2e94 | 3873 | |
bda9020e | 3874 | /* kvm_io_bus_read - called under kvm->slots_lock */ |
e32edf4f | 3875 | int kvm_io_bus_read(struct kvm_vcpu *vcpu, enum kvm_bus bus_idx, gpa_t addr, |
e93f8a0f | 3876 | int len, void *val) |
bda9020e | 3877 | { |
90d83dc3 | 3878 | struct kvm_io_bus *bus; |
743eeb0b | 3879 | struct kvm_io_range range; |
126a5af5 | 3880 | int r; |
743eeb0b SL |
3881 | |
3882 | range = (struct kvm_io_range) { | |
3883 | .addr = addr, | |
3884 | .len = len, | |
3885 | }; | |
e93f8a0f | 3886 | |
e32edf4f | 3887 | bus = srcu_dereference(vcpu->kvm->buses[bus_idx], &vcpu->kvm->srcu); |
90db1043 DH |
3888 | if (!bus) |
3889 | return -ENOMEM; | |
e32edf4f | 3890 | r = __kvm_io_bus_read(vcpu, bus, &range, val); |
126a5af5 CH |
3891 | return r < 0 ? r : 0; |
3892 | } | |
743eeb0b | 3893 | |
79fac95e | 3894 | /* Caller must hold slots_lock. */ |
743eeb0b SL |
3895 | int kvm_io_bus_register_dev(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr, |
3896 | int len, struct kvm_io_device *dev) | |
6c474694 | 3897 | { |
d4c67a7a | 3898 | int i; |
e93f8a0f | 3899 | struct kvm_io_bus *new_bus, *bus; |
d4c67a7a | 3900 | struct kvm_io_range range; |
090b7aff | 3901 | |
4a12f951 | 3902 | bus = kvm_get_bus(kvm, bus_idx); |
90db1043 DH |
3903 | if (!bus) |
3904 | return -ENOMEM; | |
3905 | ||
6ea34c9b AK |
3906 | /* exclude ioeventfd which is limited by maximum fd */ |
3907 | if (bus->dev_count - bus->ioeventfd_count > NR_IOBUS_DEVS - 1) | |
090b7aff | 3908 | return -ENOSPC; |
2eeb2e94 | 3909 | |
90952cd3 | 3910 | new_bus = kmalloc(struct_size(bus, range, bus->dev_count + 1), |
b12ce36a | 3911 | GFP_KERNEL_ACCOUNT); |
e93f8a0f MT |
3912 | if (!new_bus) |
3913 | return -ENOMEM; | |
d4c67a7a GH |
3914 | |
3915 | range = (struct kvm_io_range) { | |
3916 | .addr = addr, | |
3917 | .len = len, | |
3918 | .dev = dev, | |
3919 | }; | |
3920 | ||
3921 | for (i = 0; i < bus->dev_count; i++) | |
3922 | if (kvm_io_bus_cmp(&bus->range[i], &range) > 0) | |
3923 | break; | |
3924 | ||
3925 | memcpy(new_bus, bus, sizeof(*bus) + i * sizeof(struct kvm_io_range)); | |
3926 | new_bus->dev_count++; | |
3927 | new_bus->range[i] = range; | |
3928 | memcpy(new_bus->range + i + 1, bus->range + i, | |
3929 | (bus->dev_count - i) * sizeof(struct kvm_io_range)); | |
e93f8a0f MT |
3930 | rcu_assign_pointer(kvm->buses[bus_idx], new_bus); |
3931 | synchronize_srcu_expedited(&kvm->srcu); | |
3932 | kfree(bus); | |
090b7aff GH |
3933 | |
3934 | return 0; | |
3935 | } | |
3936 | ||
79fac95e | 3937 | /* Caller must hold slots_lock. */ |
90db1043 DH |
3938 | void kvm_io_bus_unregister_dev(struct kvm *kvm, enum kvm_bus bus_idx, |
3939 | struct kvm_io_device *dev) | |
090b7aff | 3940 | { |
90db1043 | 3941 | int i; |
e93f8a0f | 3942 | struct kvm_io_bus *new_bus, *bus; |
090b7aff | 3943 | |
4a12f951 | 3944 | bus = kvm_get_bus(kvm, bus_idx); |
df630b8c | 3945 | if (!bus) |
90db1043 | 3946 | return; |
df630b8c | 3947 | |
a1300716 AK |
3948 | for (i = 0; i < bus->dev_count; i++) |
3949 | if (bus->range[i].dev == dev) { | |
090b7aff GH |
3950 | break; |
3951 | } | |
e93f8a0f | 3952 | |
90db1043 DH |
3953 | if (i == bus->dev_count) |
3954 | return; | |
a1300716 | 3955 | |
90952cd3 | 3956 | new_bus = kmalloc(struct_size(bus, range, bus->dev_count - 1), |
b12ce36a | 3957 | GFP_KERNEL_ACCOUNT); |
90db1043 DH |
3958 | if (!new_bus) { |
3959 | pr_err("kvm: failed to shrink bus, removing it completely\n"); | |
3960 | goto broken; | |
3961 | } | |
a1300716 AK |
3962 | |
3963 | memcpy(new_bus, bus, sizeof(*bus) + i * sizeof(struct kvm_io_range)); | |
3964 | new_bus->dev_count--; | |
3965 | memcpy(new_bus->range + i, bus->range + i + 1, | |
3966 | (new_bus->dev_count - i) * sizeof(struct kvm_io_range)); | |
e93f8a0f | 3967 | |
90db1043 | 3968 | broken: |
e93f8a0f MT |
3969 | rcu_assign_pointer(kvm->buses[bus_idx], new_bus); |
3970 | synchronize_srcu_expedited(&kvm->srcu); | |
3971 | kfree(bus); | |
90db1043 | 3972 | return; |
2eeb2e94 GH |
3973 | } |
3974 | ||
8a39d006 AP |
3975 | struct kvm_io_device *kvm_io_bus_get_dev(struct kvm *kvm, enum kvm_bus bus_idx, |
3976 | gpa_t addr) | |
3977 | { | |
3978 | struct kvm_io_bus *bus; | |
3979 | int dev_idx, srcu_idx; | |
3980 | struct kvm_io_device *iodev = NULL; | |
3981 | ||
3982 | srcu_idx = srcu_read_lock(&kvm->srcu); | |
3983 | ||
3984 | bus = srcu_dereference(kvm->buses[bus_idx], &kvm->srcu); | |
90db1043 DH |
3985 | if (!bus) |
3986 | goto out_unlock; | |
8a39d006 AP |
3987 | |
3988 | dev_idx = kvm_io_bus_get_first_dev(bus, addr, 1); | |
3989 | if (dev_idx < 0) | |
3990 | goto out_unlock; | |
3991 | ||
3992 | iodev = bus->range[dev_idx].dev; | |
3993 | ||
3994 | out_unlock: | |
3995 | srcu_read_unlock(&kvm->srcu, srcu_idx); | |
3996 | ||
3997 | return iodev; | |
3998 | } | |
3999 | EXPORT_SYMBOL_GPL(kvm_io_bus_get_dev); | |
4000 | ||
536a6f88 JF |
4001 | static int kvm_debugfs_open(struct inode *inode, struct file *file, |
4002 | int (*get)(void *, u64 *), int (*set)(void *, u64), | |
4003 | const char *fmt) | |
4004 | { | |
4005 | struct kvm_stat_data *stat_data = (struct kvm_stat_data *) | |
4006 | inode->i_private; | |
4007 | ||
4008 | /* The debugfs files are a reference to the kvm struct which | |
4009 | * is still valid when kvm_destroy_vm is called. | |
4010 | * To avoid the race between open and the removal of the debugfs | |
4011 | * directory we test against the users count. | |
4012 | */ | |
e3736c3e | 4013 | if (!refcount_inc_not_zero(&stat_data->kvm->users_count)) |
536a6f88 JF |
4014 | return -ENOENT; |
4015 | ||
833b45de | 4016 | if (simple_attr_open(inode, file, get, |
09cbcef6 MP |
4017 | KVM_DBGFS_GET_MODE(stat_data->dbgfs_item) & 0222 |
4018 | ? set : NULL, | |
4019 | fmt)) { | |
536a6f88 JF |
4020 | kvm_put_kvm(stat_data->kvm); |
4021 | return -ENOMEM; | |
4022 | } | |
4023 | ||
4024 | return 0; | |
4025 | } | |
4026 | ||
4027 | static int kvm_debugfs_release(struct inode *inode, struct file *file) | |
4028 | { | |
4029 | struct kvm_stat_data *stat_data = (struct kvm_stat_data *) | |
4030 | inode->i_private; | |
4031 | ||
4032 | simple_attr_release(inode, file); | |
4033 | kvm_put_kvm(stat_data->kvm); | |
4034 | ||
4035 | return 0; | |
4036 | } | |
4037 | ||
09cbcef6 | 4038 | static int kvm_get_stat_per_vm(struct kvm *kvm, size_t offset, u64 *val) |
536a6f88 | 4039 | { |
09cbcef6 | 4040 | *val = *(ulong *)((void *)kvm + offset); |
536a6f88 | 4041 | |
09cbcef6 MP |
4042 | return 0; |
4043 | } | |
4044 | ||
4045 | static int kvm_clear_stat_per_vm(struct kvm *kvm, size_t offset) | |
4046 | { | |
4047 | *(ulong *)((void *)kvm + offset) = 0; | |
536a6f88 JF |
4048 | |
4049 | return 0; | |
4050 | } | |
4051 | ||
09cbcef6 | 4052 | static int kvm_get_stat_per_vcpu(struct kvm *kvm, size_t offset, u64 *val) |
ce35ef27 | 4053 | { |
09cbcef6 MP |
4054 | int i; |
4055 | struct kvm_vcpu *vcpu; | |
ce35ef27 | 4056 | |
09cbcef6 | 4057 | *val = 0; |
ce35ef27 | 4058 | |
09cbcef6 MP |
4059 | kvm_for_each_vcpu(i, vcpu, kvm) |
4060 | *val += *(u64 *)((void *)vcpu + offset); | |
ce35ef27 SJS |
4061 | |
4062 | return 0; | |
4063 | } | |
4064 | ||
09cbcef6 | 4065 | static int kvm_clear_stat_per_vcpu(struct kvm *kvm, size_t offset) |
536a6f88 | 4066 | { |
09cbcef6 MP |
4067 | int i; |
4068 | struct kvm_vcpu *vcpu; | |
536a6f88 | 4069 | |
09cbcef6 MP |
4070 | kvm_for_each_vcpu(i, vcpu, kvm) |
4071 | *(u64 *)((void *)vcpu + offset) = 0; | |
4072 | ||
4073 | return 0; | |
4074 | } | |
536a6f88 | 4075 | |
09cbcef6 | 4076 | static int kvm_stat_data_get(void *data, u64 *val) |
536a6f88 | 4077 | { |
09cbcef6 | 4078 | int r = -EFAULT; |
536a6f88 | 4079 | struct kvm_stat_data *stat_data = (struct kvm_stat_data *)data; |
536a6f88 | 4080 | |
09cbcef6 MP |
4081 | switch (stat_data->dbgfs_item->kind) { |
4082 | case KVM_STAT_VM: | |
4083 | r = kvm_get_stat_per_vm(stat_data->kvm, | |
4084 | stat_data->dbgfs_item->offset, val); | |
4085 | break; | |
4086 | case KVM_STAT_VCPU: | |
4087 | r = kvm_get_stat_per_vcpu(stat_data->kvm, | |
4088 | stat_data->dbgfs_item->offset, val); | |
4089 | break; | |
4090 | } | |
536a6f88 | 4091 | |
09cbcef6 | 4092 | return r; |
536a6f88 JF |
4093 | } |
4094 | ||
09cbcef6 | 4095 | static int kvm_stat_data_clear(void *data, u64 val) |
ce35ef27 | 4096 | { |
09cbcef6 | 4097 | int r = -EFAULT; |
ce35ef27 | 4098 | struct kvm_stat_data *stat_data = (struct kvm_stat_data *)data; |
ce35ef27 SJS |
4099 | |
4100 | if (val) | |
4101 | return -EINVAL; | |
4102 | ||
09cbcef6 MP |
4103 | switch (stat_data->dbgfs_item->kind) { |
4104 | case KVM_STAT_VM: | |
4105 | r = kvm_clear_stat_per_vm(stat_data->kvm, | |
4106 | stat_data->dbgfs_item->offset); | |
4107 | break; | |
4108 | case KVM_STAT_VCPU: | |
4109 | r = kvm_clear_stat_per_vcpu(stat_data->kvm, | |
4110 | stat_data->dbgfs_item->offset); | |
4111 | break; | |
4112 | } | |
ce35ef27 | 4113 | |
09cbcef6 | 4114 | return r; |
ce35ef27 SJS |
4115 | } |
4116 | ||
09cbcef6 | 4117 | static int kvm_stat_data_open(struct inode *inode, struct file *file) |
536a6f88 JF |
4118 | { |
4119 | __simple_attr_check_format("%llu\n", 0ull); | |
09cbcef6 MP |
4120 | return kvm_debugfs_open(inode, file, kvm_stat_data_get, |
4121 | kvm_stat_data_clear, "%llu\n"); | |
536a6f88 JF |
4122 | } |
4123 | ||
09cbcef6 MP |
4124 | static const struct file_operations stat_fops_per_vm = { |
4125 | .owner = THIS_MODULE, | |
4126 | .open = kvm_stat_data_open, | |
536a6f88 | 4127 | .release = kvm_debugfs_release, |
09cbcef6 MP |
4128 | .read = simple_attr_read, |
4129 | .write = simple_attr_write, | |
4130 | .llseek = no_llseek, | |
536a6f88 JF |
4131 | }; |
4132 | ||
8b88b099 | 4133 | static int vm_stat_get(void *_offset, u64 *val) |
ba1389b7 AK |
4134 | { |
4135 | unsigned offset = (long)_offset; | |
ba1389b7 | 4136 | struct kvm *kvm; |
536a6f88 | 4137 | u64 tmp_val; |
ba1389b7 | 4138 | |
8b88b099 | 4139 | *val = 0; |
0d9ce162 | 4140 | mutex_lock(&kvm_lock); |
536a6f88 | 4141 | list_for_each_entry(kvm, &vm_list, vm_list) { |
09cbcef6 | 4142 | kvm_get_stat_per_vm(kvm, offset, &tmp_val); |
536a6f88 JF |
4143 | *val += tmp_val; |
4144 | } | |
0d9ce162 | 4145 | mutex_unlock(&kvm_lock); |
8b88b099 | 4146 | return 0; |
ba1389b7 AK |
4147 | } |
4148 | ||
ce35ef27 SJS |
4149 | static int vm_stat_clear(void *_offset, u64 val) |
4150 | { | |
4151 | unsigned offset = (long)_offset; | |
4152 | struct kvm *kvm; | |
ce35ef27 SJS |
4153 | |
4154 | if (val) | |
4155 | return -EINVAL; | |
4156 | ||
0d9ce162 | 4157 | mutex_lock(&kvm_lock); |
ce35ef27 | 4158 | list_for_each_entry(kvm, &vm_list, vm_list) { |
09cbcef6 | 4159 | kvm_clear_stat_per_vm(kvm, offset); |
ce35ef27 | 4160 | } |
0d9ce162 | 4161 | mutex_unlock(&kvm_lock); |
ce35ef27 SJS |
4162 | |
4163 | return 0; | |
4164 | } | |
4165 | ||
4166 | DEFINE_SIMPLE_ATTRIBUTE(vm_stat_fops, vm_stat_get, vm_stat_clear, "%llu\n"); | |
ba1389b7 | 4167 | |
8b88b099 | 4168 | static int vcpu_stat_get(void *_offset, u64 *val) |
1165f5fe AK |
4169 | { |
4170 | unsigned offset = (long)_offset; | |
1165f5fe | 4171 | struct kvm *kvm; |
536a6f88 | 4172 | u64 tmp_val; |
1165f5fe | 4173 | |
8b88b099 | 4174 | *val = 0; |
0d9ce162 | 4175 | mutex_lock(&kvm_lock); |
536a6f88 | 4176 | list_for_each_entry(kvm, &vm_list, vm_list) { |
09cbcef6 | 4177 | kvm_get_stat_per_vcpu(kvm, offset, &tmp_val); |
536a6f88 JF |
4178 | *val += tmp_val; |
4179 | } | |
0d9ce162 | 4180 | mutex_unlock(&kvm_lock); |
8b88b099 | 4181 | return 0; |
1165f5fe AK |
4182 | } |
4183 | ||
ce35ef27 SJS |
4184 | static int vcpu_stat_clear(void *_offset, u64 val) |
4185 | { | |
4186 | unsigned offset = (long)_offset; | |
4187 | struct kvm *kvm; | |
ce35ef27 SJS |
4188 | |
4189 | if (val) | |
4190 | return -EINVAL; | |
4191 | ||
0d9ce162 | 4192 | mutex_lock(&kvm_lock); |
ce35ef27 | 4193 | list_for_each_entry(kvm, &vm_list, vm_list) { |
09cbcef6 | 4194 | kvm_clear_stat_per_vcpu(kvm, offset); |
ce35ef27 | 4195 | } |
0d9ce162 | 4196 | mutex_unlock(&kvm_lock); |
ce35ef27 SJS |
4197 | |
4198 | return 0; | |
4199 | } | |
4200 | ||
4201 | DEFINE_SIMPLE_ATTRIBUTE(vcpu_stat_fops, vcpu_stat_get, vcpu_stat_clear, | |
4202 | "%llu\n"); | |
ba1389b7 | 4203 | |
828c0950 | 4204 | static const struct file_operations *stat_fops[] = { |
ba1389b7 AK |
4205 | [KVM_STAT_VCPU] = &vcpu_stat_fops, |
4206 | [KVM_STAT_VM] = &vm_stat_fops, | |
4207 | }; | |
1165f5fe | 4208 | |
286de8f6 CI |
4209 | static void kvm_uevent_notify_change(unsigned int type, struct kvm *kvm) |
4210 | { | |
4211 | struct kobj_uevent_env *env; | |
286de8f6 CI |
4212 | unsigned long long created, active; |
4213 | ||
4214 | if (!kvm_dev.this_device || !kvm) | |
4215 | return; | |
4216 | ||
0d9ce162 | 4217 | mutex_lock(&kvm_lock); |
286de8f6 CI |
4218 | if (type == KVM_EVENT_CREATE_VM) { |
4219 | kvm_createvm_count++; | |
4220 | kvm_active_vms++; | |
4221 | } else if (type == KVM_EVENT_DESTROY_VM) { | |
4222 | kvm_active_vms--; | |
4223 | } | |
4224 | created = kvm_createvm_count; | |
4225 | active = kvm_active_vms; | |
0d9ce162 | 4226 | mutex_unlock(&kvm_lock); |
286de8f6 | 4227 | |
b12ce36a | 4228 | env = kzalloc(sizeof(*env), GFP_KERNEL_ACCOUNT); |
286de8f6 CI |
4229 | if (!env) |
4230 | return; | |
4231 | ||
4232 | add_uevent_var(env, "CREATED=%llu", created); | |
4233 | add_uevent_var(env, "COUNT=%llu", active); | |
4234 | ||
fdeaf7e3 | 4235 | if (type == KVM_EVENT_CREATE_VM) { |
286de8f6 | 4236 | add_uevent_var(env, "EVENT=create"); |
fdeaf7e3 CI |
4237 | kvm->userspace_pid = task_pid_nr(current); |
4238 | } else if (type == KVM_EVENT_DESTROY_VM) { | |
286de8f6 | 4239 | add_uevent_var(env, "EVENT=destroy"); |
fdeaf7e3 CI |
4240 | } |
4241 | add_uevent_var(env, "PID=%d", kvm->userspace_pid); | |
286de8f6 | 4242 | |
8ed0579c | 4243 | if (!IS_ERR_OR_NULL(kvm->debugfs_dentry)) { |
b12ce36a | 4244 | char *tmp, *p = kmalloc(PATH_MAX, GFP_KERNEL_ACCOUNT); |
fdeaf7e3 CI |
4245 | |
4246 | if (p) { | |
4247 | tmp = dentry_path_raw(kvm->debugfs_dentry, p, PATH_MAX); | |
4248 | if (!IS_ERR(tmp)) | |
4249 | add_uevent_var(env, "STATS_PATH=%s", tmp); | |
4250 | kfree(p); | |
286de8f6 CI |
4251 | } |
4252 | } | |
4253 | /* no need for checks, since we are adding at most only 5 keys */ | |
4254 | env->envp[env->envp_idx++] = NULL; | |
4255 | kobject_uevent_env(&kvm_dev.this_device->kobj, KOBJ_CHANGE, env->envp); | |
4256 | kfree(env); | |
286de8f6 CI |
4257 | } |
4258 | ||
929f45e3 | 4259 | static void kvm_init_debug(void) |
6aa8b732 AK |
4260 | { |
4261 | struct kvm_stats_debugfs_item *p; | |
4262 | ||
76f7c879 | 4263 | kvm_debugfs_dir = debugfs_create_dir("kvm", NULL); |
4f69b680 | 4264 | |
536a6f88 JF |
4265 | kvm_debugfs_num_entries = 0; |
4266 | for (p = debugfs_entries; p->name; ++p, kvm_debugfs_num_entries++) { | |
09cbcef6 MP |
4267 | debugfs_create_file(p->name, KVM_DBGFS_GET_MODE(p), |
4268 | kvm_debugfs_dir, (void *)(long)p->offset, | |
929f45e3 | 4269 | stat_fops[p->kind]); |
4f69b680 | 4270 | } |
6aa8b732 AK |
4271 | } |
4272 | ||
fb3600cc | 4273 | static int kvm_suspend(void) |
59ae6c6b | 4274 | { |
10474ae8 | 4275 | if (kvm_usage_count) |
75b7127c | 4276 | hardware_disable_nolock(NULL); |
59ae6c6b AK |
4277 | return 0; |
4278 | } | |
4279 | ||
fb3600cc | 4280 | static void kvm_resume(void) |
59ae6c6b | 4281 | { |
ca84d1a2 | 4282 | if (kvm_usage_count) { |
2eb06c30 WL |
4283 | #ifdef CONFIG_LOCKDEP |
4284 | WARN_ON(lockdep_is_held(&kvm_count_lock)); | |
4285 | #endif | |
75b7127c | 4286 | hardware_enable_nolock(NULL); |
ca84d1a2 | 4287 | } |
59ae6c6b AK |
4288 | } |
4289 | ||
fb3600cc | 4290 | static struct syscore_ops kvm_syscore_ops = { |
59ae6c6b AK |
4291 | .suspend = kvm_suspend, |
4292 | .resume = kvm_resume, | |
4293 | }; | |
4294 | ||
15ad7146 AK |
4295 | static inline |
4296 | struct kvm_vcpu *preempt_notifier_to_vcpu(struct preempt_notifier *pn) | |
4297 | { | |
4298 | return container_of(pn, struct kvm_vcpu, preempt_notifier); | |
4299 | } | |
4300 | ||
4301 | static void kvm_sched_in(struct preempt_notifier *pn, int cpu) | |
4302 | { | |
4303 | struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn); | |
f95ef0cd | 4304 | |
046ddeed | 4305 | WRITE_ONCE(vcpu->preempted, false); |
d73eb57b | 4306 | WRITE_ONCE(vcpu->ready, false); |
15ad7146 | 4307 | |
e790d9ef RK |
4308 | kvm_arch_sched_in(vcpu, cpu); |
4309 | ||
e9b11c17 | 4310 | kvm_arch_vcpu_load(vcpu, cpu); |
15ad7146 AK |
4311 | } |
4312 | ||
4313 | static void kvm_sched_out(struct preempt_notifier *pn, | |
4314 | struct task_struct *next) | |
4315 | { | |
4316 | struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn); | |
4317 | ||
d73eb57b | 4318 | if (current->state == TASK_RUNNING) { |
046ddeed | 4319 | WRITE_ONCE(vcpu->preempted, true); |
d73eb57b WL |
4320 | WRITE_ONCE(vcpu->ready, true); |
4321 | } | |
e9b11c17 | 4322 | kvm_arch_vcpu_put(vcpu); |
15ad7146 AK |
4323 | } |
4324 | ||
f257d6dc SC |
4325 | static void check_processor_compat(void *rtn) |
4326 | { | |
4327 | *(int *)rtn = kvm_arch_check_processor_compat(); | |
4328 | } | |
4329 | ||
0ee75bea | 4330 | int kvm_init(void *opaque, unsigned vcpu_size, unsigned vcpu_align, |
c16f862d | 4331 | struct module *module) |
6aa8b732 AK |
4332 | { |
4333 | int r; | |
002c7f7c | 4334 | int cpu; |
6aa8b732 | 4335 | |
f8c16bba ZX |
4336 | r = kvm_arch_init(opaque); |
4337 | if (r) | |
d2308784 | 4338 | goto out_fail; |
cb498ea2 | 4339 | |
7dac16c3 AH |
4340 | /* |
4341 | * kvm_arch_init makes sure there's at most one caller | |
4342 | * for architectures that support multiple implementations, | |
4343 | * like intel and amd on x86. | |
36343f6e PB |
4344 | * kvm_arch_init must be called before kvm_irqfd_init to avoid creating |
4345 | * conflicts in case kvm is already setup for another implementation. | |
7dac16c3 | 4346 | */ |
36343f6e PB |
4347 | r = kvm_irqfd_init(); |
4348 | if (r) | |
4349 | goto out_irqfd; | |
7dac16c3 | 4350 | |
8437a617 | 4351 | if (!zalloc_cpumask_var(&cpus_hardware_enabled, GFP_KERNEL)) { |
7f59f492 RR |
4352 | r = -ENOMEM; |
4353 | goto out_free_0; | |
4354 | } | |
4355 | ||
e9b11c17 | 4356 | r = kvm_arch_hardware_setup(); |
6aa8b732 | 4357 | if (r < 0) |
faf0be22 | 4358 | goto out_free_1; |
6aa8b732 | 4359 | |
002c7f7c | 4360 | for_each_online_cpu(cpu) { |
f257d6dc | 4361 | smp_call_function_single(cpu, check_processor_compat, &r, 1); |
002c7f7c | 4362 | if (r < 0) |
faf0be22 | 4363 | goto out_free_2; |
002c7f7c YS |
4364 | } |
4365 | ||
73c1b41e | 4366 | r = cpuhp_setup_state_nocalls(CPUHP_AP_KVM_STARTING, "kvm/cpu:starting", |
8c18b2d2 | 4367 | kvm_starting_cpu, kvm_dying_cpu); |
774c47f1 | 4368 | if (r) |
d2308784 | 4369 | goto out_free_2; |
6aa8b732 AK |
4370 | register_reboot_notifier(&kvm_reboot_notifier); |
4371 | ||
c16f862d | 4372 | /* A kmem cache lets us meet the alignment requirements of fx_save. */ |
0ee75bea AK |
4373 | if (!vcpu_align) |
4374 | vcpu_align = __alignof__(struct kvm_vcpu); | |
46515736 PB |
4375 | kvm_vcpu_cache = |
4376 | kmem_cache_create_usercopy("kvm_vcpu", vcpu_size, vcpu_align, | |
4377 | SLAB_ACCOUNT, | |
4378 | offsetof(struct kvm_vcpu, arch), | |
4379 | sizeof_field(struct kvm_vcpu, arch), | |
4380 | NULL); | |
c16f862d RR |
4381 | if (!kvm_vcpu_cache) { |
4382 | r = -ENOMEM; | |
fb3600cc | 4383 | goto out_free_3; |
c16f862d RR |
4384 | } |
4385 | ||
af585b92 GN |
4386 | r = kvm_async_pf_init(); |
4387 | if (r) | |
4388 | goto out_free; | |
4389 | ||
6aa8b732 | 4390 | kvm_chardev_ops.owner = module; |
3d3aab1b CB |
4391 | kvm_vm_fops.owner = module; |
4392 | kvm_vcpu_fops.owner = module; | |
6aa8b732 AK |
4393 | |
4394 | r = misc_register(&kvm_dev); | |
4395 | if (r) { | |
1170adc6 | 4396 | pr_err("kvm: misc device register failed\n"); |
af585b92 | 4397 | goto out_unreg; |
6aa8b732 AK |
4398 | } |
4399 | ||
fb3600cc RW |
4400 | register_syscore_ops(&kvm_syscore_ops); |
4401 | ||
15ad7146 AK |
4402 | kvm_preempt_ops.sched_in = kvm_sched_in; |
4403 | kvm_preempt_ops.sched_out = kvm_sched_out; | |
4404 | ||
929f45e3 | 4405 | kvm_init_debug(); |
0ea4ed8e | 4406 | |
3c3c29fd PB |
4407 | r = kvm_vfio_ops_init(); |
4408 | WARN_ON(r); | |
4409 | ||
c7addb90 | 4410 | return 0; |
6aa8b732 | 4411 | |
af585b92 GN |
4412 | out_unreg: |
4413 | kvm_async_pf_deinit(); | |
6aa8b732 | 4414 | out_free: |
c16f862d | 4415 | kmem_cache_destroy(kvm_vcpu_cache); |
d2308784 | 4416 | out_free_3: |
6aa8b732 | 4417 | unregister_reboot_notifier(&kvm_reboot_notifier); |
8c18b2d2 | 4418 | cpuhp_remove_state_nocalls(CPUHP_AP_KVM_STARTING); |
d2308784 | 4419 | out_free_2: |
e9b11c17 | 4420 | kvm_arch_hardware_unsetup(); |
faf0be22 | 4421 | out_free_1: |
7f59f492 | 4422 | free_cpumask_var(cpus_hardware_enabled); |
d2308784 | 4423 | out_free_0: |
a0f155e9 | 4424 | kvm_irqfd_exit(); |
36343f6e | 4425 | out_irqfd: |
7dac16c3 AH |
4426 | kvm_arch_exit(); |
4427 | out_fail: | |
6aa8b732 AK |
4428 | return r; |
4429 | } | |
cb498ea2 | 4430 | EXPORT_SYMBOL_GPL(kvm_init); |
6aa8b732 | 4431 | |
cb498ea2 | 4432 | void kvm_exit(void) |
6aa8b732 | 4433 | { |
4bd33b56 | 4434 | debugfs_remove_recursive(kvm_debugfs_dir); |
6aa8b732 | 4435 | misc_deregister(&kvm_dev); |
c16f862d | 4436 | kmem_cache_destroy(kvm_vcpu_cache); |
af585b92 | 4437 | kvm_async_pf_deinit(); |
fb3600cc | 4438 | unregister_syscore_ops(&kvm_syscore_ops); |
6aa8b732 | 4439 | unregister_reboot_notifier(&kvm_reboot_notifier); |
8c18b2d2 | 4440 | cpuhp_remove_state_nocalls(CPUHP_AP_KVM_STARTING); |
75b7127c | 4441 | on_each_cpu(hardware_disable_nolock, NULL, 1); |
e9b11c17 | 4442 | kvm_arch_hardware_unsetup(); |
f8c16bba | 4443 | kvm_arch_exit(); |
a0f155e9 | 4444 | kvm_irqfd_exit(); |
7f59f492 | 4445 | free_cpumask_var(cpus_hardware_enabled); |
571ee1b6 | 4446 | kvm_vfio_ops_exit(); |
6aa8b732 | 4447 | } |
cb498ea2 | 4448 | EXPORT_SYMBOL_GPL(kvm_exit); |
c57c8046 JS |
4449 | |
4450 | struct kvm_vm_worker_thread_context { | |
4451 | struct kvm *kvm; | |
4452 | struct task_struct *parent; | |
4453 | struct completion init_done; | |
4454 | kvm_vm_thread_fn_t thread_fn; | |
4455 | uintptr_t data; | |
4456 | int err; | |
4457 | }; | |
4458 | ||
4459 | static int kvm_vm_worker_thread(void *context) | |
4460 | { | |
4461 | /* | |
4462 | * The init_context is allocated on the stack of the parent thread, so | |
4463 | * we have to locally copy anything that is needed beyond initialization | |
4464 | */ | |
4465 | struct kvm_vm_worker_thread_context *init_context = context; | |
4466 | struct kvm *kvm = init_context->kvm; | |
4467 | kvm_vm_thread_fn_t thread_fn = init_context->thread_fn; | |
4468 | uintptr_t data = init_context->data; | |
4469 | int err; | |
4470 | ||
4471 | err = kthread_park(current); | |
4472 | /* kthread_park(current) is never supposed to return an error */ | |
4473 | WARN_ON(err != 0); | |
4474 | if (err) | |
4475 | goto init_complete; | |
4476 | ||
4477 | err = cgroup_attach_task_all(init_context->parent, current); | |
4478 | if (err) { | |
4479 | kvm_err("%s: cgroup_attach_task_all failed with err %d\n", | |
4480 | __func__, err); | |
4481 | goto init_complete; | |
4482 | } | |
4483 | ||
4484 | set_user_nice(current, task_nice(init_context->parent)); | |
4485 | ||
4486 | init_complete: | |
4487 | init_context->err = err; | |
4488 | complete(&init_context->init_done); | |
4489 | init_context = NULL; | |
4490 | ||
4491 | if (err) | |
4492 | return err; | |
4493 | ||
4494 | /* Wait to be woken up by the spawner before proceeding. */ | |
4495 | kthread_parkme(); | |
4496 | ||
4497 | if (!kthread_should_stop()) | |
4498 | err = thread_fn(kvm, data); | |
4499 | ||
4500 | return err; | |
4501 | } | |
4502 | ||
4503 | int kvm_vm_create_worker_thread(struct kvm *kvm, kvm_vm_thread_fn_t thread_fn, | |
4504 | uintptr_t data, const char *name, | |
4505 | struct task_struct **thread_ptr) | |
4506 | { | |
4507 | struct kvm_vm_worker_thread_context init_context = {}; | |
4508 | struct task_struct *thread; | |
4509 | ||
4510 | *thread_ptr = NULL; | |
4511 | init_context.kvm = kvm; | |
4512 | init_context.parent = current; | |
4513 | init_context.thread_fn = thread_fn; | |
4514 | init_context.data = data; | |
4515 | init_completion(&init_context.init_done); | |
4516 | ||
4517 | thread = kthread_run(kvm_vm_worker_thread, &init_context, | |
4518 | "%s-%d", name, task_pid_nr(current)); | |
4519 | if (IS_ERR(thread)) | |
4520 | return PTR_ERR(thread); | |
4521 | ||
4522 | /* kthread_run is never supposed to return NULL */ | |
4523 | WARN_ON(thread == NULL); | |
4524 | ||
4525 | wait_for_completion(&init_context.init_done); | |
4526 | ||
4527 | if (!init_context.err) | |
4528 | *thread_ptr = thread; | |
4529 | ||
4530 | return init_context.err; | |
4531 | } |