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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> |
2fdef3a2 | 54 | #include <linux/suspend.h> |
6aa8b732 | 55 | |
e495606d | 56 | #include <asm/processor.h> |
2ea75be3 | 57 | #include <asm/ioctl.h> |
7c0f6ba6 | 58 | #include <linux/uaccess.h> |
6aa8b732 | 59 | |
5f94c174 | 60 | #include "coalesced_mmio.h" |
af585b92 | 61 | #include "async_pf.h" |
531810ca | 62 | #include "mmu_lock.h" |
3c3c29fd | 63 | #include "vfio.h" |
5f94c174 | 64 | |
229456fc MT |
65 | #define CREATE_TRACE_POINTS |
66 | #include <trace/events/kvm.h> | |
67 | ||
fb04a1ed PX |
68 | #include <linux/kvm_dirty_ring.h> |
69 | ||
536a6f88 JF |
70 | /* Worst case buffer size needed for holding an integer. */ |
71 | #define ITOA_MAX_LEN 12 | |
72 | ||
6aa8b732 AK |
73 | MODULE_AUTHOR("Qumranet"); |
74 | MODULE_LICENSE("GPL"); | |
75 | ||
920552b2 | 76 | /* Architectures should define their poll value according to the halt latency */ |
ec76d819 | 77 | unsigned int halt_poll_ns = KVM_HALT_POLL_NS_DEFAULT; |
039c5d1b | 78 | module_param(halt_poll_ns, uint, 0644); |
ec76d819 | 79 | EXPORT_SYMBOL_GPL(halt_poll_ns); |
f7819512 | 80 | |
aca6ff29 | 81 | /* Default doubles per-vcpu halt_poll_ns. */ |
ec76d819 | 82 | unsigned int halt_poll_ns_grow = 2; |
039c5d1b | 83 | module_param(halt_poll_ns_grow, uint, 0644); |
ec76d819 | 84 | EXPORT_SYMBOL_GPL(halt_poll_ns_grow); |
aca6ff29 | 85 | |
49113d36 NW |
86 | /* The start value to grow halt_poll_ns from */ |
87 | unsigned int halt_poll_ns_grow_start = 10000; /* 10us */ | |
88 | module_param(halt_poll_ns_grow_start, uint, 0644); | |
89 | EXPORT_SYMBOL_GPL(halt_poll_ns_grow_start); | |
90 | ||
aca6ff29 | 91 | /* Default resets per-vcpu halt_poll_ns . */ |
ec76d819 | 92 | unsigned int halt_poll_ns_shrink; |
039c5d1b | 93 | module_param(halt_poll_ns_shrink, uint, 0644); |
ec76d819 | 94 | EXPORT_SYMBOL_GPL(halt_poll_ns_shrink); |
aca6ff29 | 95 | |
fa40a821 MT |
96 | /* |
97 | * Ordering of locks: | |
98 | * | |
b7d409de | 99 | * kvm->lock --> kvm->slots_lock --> kvm->irq_lock |
fa40a821 MT |
100 | */ |
101 | ||
0d9ce162 | 102 | DEFINE_MUTEX(kvm_lock); |
4a937f96 | 103 | static DEFINE_RAW_SPINLOCK(kvm_count_lock); |
e9b11c17 | 104 | LIST_HEAD(vm_list); |
133de902 | 105 | |
7f59f492 | 106 | static cpumask_var_t cpus_hardware_enabled; |
f4fee932 | 107 | static int kvm_usage_count; |
10474ae8 | 108 | static atomic_t hardware_enable_failed; |
1b6c0168 | 109 | |
aaba298c | 110 | static struct kmem_cache *kvm_vcpu_cache; |
1165f5fe | 111 | |
15ad7146 | 112 | static __read_mostly struct preempt_ops kvm_preempt_ops; |
7495e22b | 113 | static DEFINE_PER_CPU(struct kvm_vcpu *, kvm_running_vcpu); |
15ad7146 | 114 | |
76f7c879 | 115 | struct dentry *kvm_debugfs_dir; |
e23a808b | 116 | EXPORT_SYMBOL_GPL(kvm_debugfs_dir); |
6aa8b732 | 117 | |
09cbcef6 | 118 | static const struct file_operations stat_fops_per_vm; |
536a6f88 | 119 | |
bccf2150 AK |
120 | static long kvm_vcpu_ioctl(struct file *file, unsigned int ioctl, |
121 | unsigned long arg); | |
de8e5d74 | 122 | #ifdef CONFIG_KVM_COMPAT |
1dda606c AG |
123 | static long kvm_vcpu_compat_ioctl(struct file *file, unsigned int ioctl, |
124 | unsigned long arg); | |
7ddfd3e0 MZ |
125 | #define KVM_COMPAT(c) .compat_ioctl = (c) |
126 | #else | |
9cb09e7c MZ |
127 | /* |
128 | * For architectures that don't implement a compat infrastructure, | |
129 | * adopt a double line of defense: | |
130 | * - Prevent a compat task from opening /dev/kvm | |
131 | * - If the open has been done by a 64bit task, and the KVM fd | |
132 | * passed to a compat task, let the ioctls fail. | |
133 | */ | |
7ddfd3e0 MZ |
134 | static long kvm_no_compat_ioctl(struct file *file, unsigned int ioctl, |
135 | unsigned long arg) { return -EINVAL; } | |
b9876e6d MZ |
136 | |
137 | static int kvm_no_compat_open(struct inode *inode, struct file *file) | |
138 | { | |
139 | return is_compat_task() ? -ENODEV : 0; | |
140 | } | |
141 | #define KVM_COMPAT(c) .compat_ioctl = kvm_no_compat_ioctl, \ | |
142 | .open = kvm_no_compat_open | |
1dda606c | 143 | #endif |
10474ae8 AG |
144 | static int hardware_enable_all(void); |
145 | static void hardware_disable_all(void); | |
bccf2150 | 146 | |
e93f8a0f | 147 | static void kvm_io_bus_destroy(struct kvm_io_bus *bus); |
7940876e | 148 | |
52480137 | 149 | __visible bool kvm_rebooting; |
b7c4145b | 150 | EXPORT_SYMBOL_GPL(kvm_rebooting); |
4ecac3fd | 151 | |
286de8f6 CI |
152 | #define KVM_EVENT_CREATE_VM 0 |
153 | #define KVM_EVENT_DESTROY_VM 1 | |
154 | static void kvm_uevent_notify_change(unsigned int type, struct kvm *kvm); | |
155 | static unsigned long long kvm_createvm_count; | |
156 | static unsigned long long kvm_active_vms; | |
157 | ||
baff59cc VK |
158 | static DEFINE_PER_CPU(cpumask_var_t, cpu_kick_mask); |
159 | ||
e649b3f0 ET |
160 | __weak void kvm_arch_mmu_notifier_invalidate_range(struct kvm *kvm, |
161 | unsigned long start, unsigned long end) | |
b1394e74 RK |
162 | { |
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 | 187 | return PageReserved(pfn_to_page(pfn)) && |
7df003c8 | 188 | !is_zero_pfn(pfn) && |
a78986aa | 189 | !kvm_is_zone_device_pfn(pfn); |
cbff90a7 BAY |
190 | |
191 | return true; | |
192 | } | |
193 | ||
bccf2150 AK |
194 | /* |
195 | * Switches to specified vcpu, until a matching vcpu_put() | |
196 | */ | |
ec7660cc | 197 | void vcpu_load(struct kvm_vcpu *vcpu) |
6aa8b732 | 198 | { |
ec7660cc | 199 | int cpu = get_cpu(); |
7495e22b PB |
200 | |
201 | __this_cpu_write(kvm_running_vcpu, vcpu); | |
15ad7146 | 202 | preempt_notifier_register(&vcpu->preempt_notifier); |
313a3dc7 | 203 | kvm_arch_vcpu_load(vcpu, cpu); |
15ad7146 | 204 | put_cpu(); |
6aa8b732 | 205 | } |
2f1fe811 | 206 | EXPORT_SYMBOL_GPL(vcpu_load); |
6aa8b732 | 207 | |
313a3dc7 | 208 | void vcpu_put(struct kvm_vcpu *vcpu) |
6aa8b732 | 209 | { |
15ad7146 | 210 | preempt_disable(); |
313a3dc7 | 211 | kvm_arch_vcpu_put(vcpu); |
15ad7146 | 212 | preempt_notifier_unregister(&vcpu->preempt_notifier); |
7495e22b | 213 | __this_cpu_write(kvm_running_vcpu, NULL); |
15ad7146 | 214 | preempt_enable(); |
6aa8b732 | 215 | } |
2f1fe811 | 216 | EXPORT_SYMBOL_GPL(vcpu_put); |
6aa8b732 | 217 | |
7a97cec2 PB |
218 | /* TODO: merge with kvm_arch_vcpu_should_kick */ |
219 | static bool kvm_request_needs_ipi(struct kvm_vcpu *vcpu, unsigned req) | |
220 | { | |
221 | int mode = kvm_vcpu_exiting_guest_mode(vcpu); | |
222 | ||
223 | /* | |
224 | * We need to wait for the VCPU to reenable interrupts and get out of | |
225 | * READING_SHADOW_PAGE_TABLES mode. | |
226 | */ | |
227 | if (req & KVM_REQUEST_WAIT) | |
228 | return mode != OUTSIDE_GUEST_MODE; | |
229 | ||
230 | /* | |
231 | * Need to kick a running VCPU, but otherwise there is nothing to do. | |
232 | */ | |
233 | return mode == IN_GUEST_MODE; | |
234 | } | |
235 | ||
d9e368d6 AK |
236 | static void ack_flush(void *_completed) |
237 | { | |
d9e368d6 AK |
238 | } |
239 | ||
0bbc2ca8 | 240 | static inline bool kvm_kick_many_cpus(cpumask_var_t tmp, bool wait) |
b49defe8 | 241 | { |
0bbc2ca8 SC |
242 | const struct cpumask *cpus; |
243 | ||
244 | if (likely(cpumask_available(tmp))) | |
245 | cpus = tmp; | |
246 | else | |
b49defe8 PB |
247 | cpus = cpu_online_mask; |
248 | ||
249 | if (cpumask_empty(cpus)) | |
250 | return false; | |
251 | ||
252 | smp_call_function_many(cpus, ack_flush, NULL, wait); | |
253 | return true; | |
254 | } | |
255 | ||
ae0946cd VK |
256 | static void kvm_make_vcpu_request(struct kvm *kvm, struct kvm_vcpu *vcpu, |
257 | unsigned int req, cpumask_var_t tmp, | |
258 | int current_cpu) | |
259 | { | |
260 | int cpu; | |
261 | ||
262 | kvm_make_request(req, vcpu); | |
263 | ||
264 | if (!(req & KVM_REQUEST_NO_WAKEUP) && kvm_vcpu_wake_up(vcpu)) | |
265 | return; | |
266 | ||
267 | /* | |
268 | * tmp can be "unavailable" if cpumasks are allocated off stack as | |
269 | * allocation of the mask is deliberately not fatal and is handled by | |
270 | * falling back to kicking all online CPUs. | |
271 | */ | |
272 | if (!cpumask_available(tmp)) | |
273 | return; | |
274 | ||
275 | /* | |
276 | * Note, the vCPU could get migrated to a different pCPU at any point | |
277 | * after kvm_request_needs_ipi(), which could result in sending an IPI | |
278 | * to the previous pCPU. But, that's OK because the purpose of the IPI | |
279 | * is to ensure the vCPU returns to OUTSIDE_GUEST_MODE, which is | |
280 | * satisfied if the vCPU migrates. Entering READING_SHADOW_PAGE_TABLES | |
281 | * after this point is also OK, as the requirement is only that KVM wait | |
282 | * for vCPUs that were reading SPTEs _before_ any changes were | |
283 | * finalized. See kvm_vcpu_kick() for more details on handling requests. | |
284 | */ | |
285 | if (kvm_request_needs_ipi(vcpu, req)) { | |
286 | cpu = READ_ONCE(vcpu->cpu); | |
287 | if (cpu != -1 && cpu != current_cpu) | |
288 | __cpumask_set_cpu(cpu, tmp); | |
289 | } | |
290 | } | |
291 | ||
7053df4e VK |
292 | bool kvm_make_vcpus_request_mask(struct kvm *kvm, unsigned int req, |
293 | unsigned long *vcpu_bitmap, cpumask_var_t tmp) | |
d9e368d6 | 294 | { |
d9e368d6 | 295 | struct kvm_vcpu *vcpu; |
ae0946cd | 296 | int i, me; |
7053df4e | 297 | bool called; |
6ef7a1bc | 298 | |
3cba4130 | 299 | me = get_cpu(); |
7053df4e | 300 | |
ae0946cd VK |
301 | for_each_set_bit(i, vcpu_bitmap, KVM_MAX_VCPUS) { |
302 | vcpu = kvm_get_vcpu(kvm, i); | |
381cecc5 | 303 | if (!vcpu) |
7053df4e | 304 | continue; |
ae0946cd | 305 | kvm_make_vcpu_request(kvm, vcpu, req, tmp, me); |
49846896 | 306 | } |
7053df4e VK |
307 | |
308 | called = kvm_kick_many_cpus(tmp, !!(req & KVM_REQUEST_WAIT)); | |
3cba4130 | 309 | put_cpu(); |
7053df4e VK |
310 | |
311 | return called; | |
312 | } | |
313 | ||
54163a34 SS |
314 | bool kvm_make_all_cpus_request_except(struct kvm *kvm, unsigned int req, |
315 | struct kvm_vcpu *except) | |
7053df4e | 316 | { |
ae0946cd | 317 | struct kvm_vcpu *vcpu; |
baff59cc | 318 | struct cpumask *cpus; |
7053df4e | 319 | bool called; |
ae0946cd | 320 | int i, me; |
7053df4e | 321 | |
ae0946cd VK |
322 | me = get_cpu(); |
323 | ||
baff59cc VK |
324 | cpus = this_cpu_cpumask_var_ptr(cpu_kick_mask); |
325 | cpumask_clear(cpus); | |
326 | ||
ae0946cd VK |
327 | kvm_for_each_vcpu(i, vcpu, kvm) { |
328 | if (vcpu == except) | |
329 | continue; | |
330 | kvm_make_vcpu_request(kvm, vcpu, req, cpus, me); | |
331 | } | |
332 | ||
333 | called = kvm_kick_many_cpus(cpus, !!(req & KVM_REQUEST_WAIT)); | |
334 | put_cpu(); | |
7053df4e | 335 | |
49846896 | 336 | return called; |
d9e368d6 AK |
337 | } |
338 | ||
54163a34 SS |
339 | bool kvm_make_all_cpus_request(struct kvm *kvm, unsigned int req) |
340 | { | |
341 | return kvm_make_all_cpus_request_except(kvm, req, NULL); | |
342 | } | |
a2486020 | 343 | EXPORT_SYMBOL_GPL(kvm_make_all_cpus_request); |
54163a34 | 344 | |
a6d51016 | 345 | #ifndef CONFIG_HAVE_KVM_ARCH_TLB_FLUSH_ALL |
49846896 | 346 | void kvm_flush_remote_tlbs(struct kvm *kvm) |
2e53d63a | 347 | { |
3cc4e148 | 348 | ++kvm->stat.generic.remote_tlb_flush_requests; |
6bc6db00 | 349 | |
4ae3cb3a LT |
350 | /* |
351 | * We want to publish modifications to the page tables before reading | |
352 | * mode. Pairs with a memory barrier in arch-specific code. | |
353 | * - x86: smp_mb__after_srcu_read_unlock in vcpu_enter_guest | |
354 | * and smp_mb in walk_shadow_page_lockless_begin/end. | |
355 | * - powerpc: smp_mb in kvmppc_prepare_to_enter. | |
356 | * | |
357 | * There is already an smp_mb__after_atomic() before | |
358 | * kvm_make_all_cpus_request() reads vcpu->mode. We reuse that | |
359 | * barrier here. | |
360 | */ | |
b08660e5 TL |
361 | if (!kvm_arch_flush_remote_tlb(kvm) |
362 | || kvm_make_all_cpus_request(kvm, KVM_REQ_TLB_FLUSH)) | |
0193cc90 | 363 | ++kvm->stat.generic.remote_tlb_flush; |
2e53d63a | 364 | } |
2ba9f0d8 | 365 | EXPORT_SYMBOL_GPL(kvm_flush_remote_tlbs); |
a6d51016 | 366 | #endif |
2e53d63a | 367 | |
49846896 RR |
368 | void kvm_reload_remote_mmus(struct kvm *kvm) |
369 | { | |
445b8236 | 370 | kvm_make_all_cpus_request(kvm, KVM_REQ_MMU_RELOAD); |
49846896 | 371 | } |
2e53d63a | 372 | |
6926f95a SC |
373 | #ifdef KVM_ARCH_NR_OBJS_PER_MEMORY_CACHE |
374 | static inline void *mmu_memory_cache_alloc_obj(struct kvm_mmu_memory_cache *mc, | |
375 | gfp_t gfp_flags) | |
376 | { | |
377 | gfp_flags |= mc->gfp_zero; | |
378 | ||
379 | if (mc->kmem_cache) | |
380 | return kmem_cache_alloc(mc->kmem_cache, gfp_flags); | |
381 | else | |
382 | return (void *)__get_free_page(gfp_flags); | |
383 | } | |
384 | ||
385 | int kvm_mmu_topup_memory_cache(struct kvm_mmu_memory_cache *mc, int min) | |
386 | { | |
387 | void *obj; | |
388 | ||
389 | if (mc->nobjs >= min) | |
390 | return 0; | |
391 | while (mc->nobjs < ARRAY_SIZE(mc->objects)) { | |
392 | obj = mmu_memory_cache_alloc_obj(mc, GFP_KERNEL_ACCOUNT); | |
393 | if (!obj) | |
394 | return mc->nobjs >= min ? 0 : -ENOMEM; | |
395 | mc->objects[mc->nobjs++] = obj; | |
396 | } | |
397 | return 0; | |
398 | } | |
399 | ||
400 | int kvm_mmu_memory_cache_nr_free_objects(struct kvm_mmu_memory_cache *mc) | |
401 | { | |
402 | return mc->nobjs; | |
403 | } | |
404 | ||
405 | void kvm_mmu_free_memory_cache(struct kvm_mmu_memory_cache *mc) | |
406 | { | |
407 | while (mc->nobjs) { | |
408 | if (mc->kmem_cache) | |
409 | kmem_cache_free(mc->kmem_cache, mc->objects[--mc->nobjs]); | |
410 | else | |
411 | free_page((unsigned long)mc->objects[--mc->nobjs]); | |
412 | } | |
413 | } | |
414 | ||
415 | void *kvm_mmu_memory_cache_alloc(struct kvm_mmu_memory_cache *mc) | |
416 | { | |
417 | void *p; | |
418 | ||
419 | if (WARN_ON(!mc->nobjs)) | |
420 | p = mmu_memory_cache_alloc_obj(mc, GFP_ATOMIC | __GFP_ACCOUNT); | |
421 | else | |
422 | p = mc->objects[--mc->nobjs]; | |
423 | BUG_ON(!p); | |
424 | return p; | |
425 | } | |
426 | #endif | |
427 | ||
8bd826d6 | 428 | static void kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id) |
fb3f0f51 | 429 | { |
fb3f0f51 RR |
430 | mutex_init(&vcpu->mutex); |
431 | vcpu->cpu = -1; | |
fb3f0f51 RR |
432 | vcpu->kvm = kvm; |
433 | vcpu->vcpu_id = id; | |
34bb10b7 | 434 | vcpu->pid = NULL; |
da4ad88c | 435 | rcuwait_init(&vcpu->wait); |
af585b92 | 436 | kvm_async_pf_vcpu_init(vcpu); |
fb3f0f51 | 437 | |
bf9f6ac8 FW |
438 | vcpu->pre_pcpu = -1; |
439 | INIT_LIST_HEAD(&vcpu->blocked_vcpu_list); | |
440 | ||
4c088493 R |
441 | kvm_vcpu_set_in_spin_loop(vcpu, false); |
442 | kvm_vcpu_set_dy_eligible(vcpu, false); | |
3a08a8f9 | 443 | vcpu->preempted = false; |
d73eb57b | 444 | vcpu->ready = false; |
d5c48deb | 445 | preempt_notifier_init(&vcpu->preempt_notifier, &kvm_preempt_ops); |
fe22ed82 | 446 | vcpu->last_used_slot = 0; |
fb3f0f51 | 447 | } |
fb3f0f51 | 448 | |
4543bdc0 SC |
449 | void kvm_vcpu_destroy(struct kvm_vcpu *vcpu) |
450 | { | |
fb04a1ed | 451 | kvm_dirty_ring_free(&vcpu->dirty_ring); |
4543bdc0 | 452 | kvm_arch_vcpu_destroy(vcpu); |
e529ef66 | 453 | |
9941d224 SC |
454 | /* |
455 | * No need for rcu_read_lock as VCPU_RUN is the only place that changes | |
456 | * the vcpu->pid pointer, and at destruction time all file descriptors | |
457 | * are already gone. | |
458 | */ | |
459 | put_pid(rcu_dereference_protected(vcpu->pid, 1)); | |
460 | ||
8bd826d6 | 461 | free_page((unsigned long)vcpu->run); |
e529ef66 | 462 | kmem_cache_free(kvm_vcpu_cache, vcpu); |
4543bdc0 SC |
463 | } |
464 | EXPORT_SYMBOL_GPL(kvm_vcpu_destroy); | |
465 | ||
e930bffe AA |
466 | #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER) |
467 | static inline struct kvm *mmu_notifier_to_kvm(struct mmu_notifier *mn) | |
468 | { | |
469 | return container_of(mn, struct kvm, mmu_notifier); | |
470 | } | |
471 | ||
e649b3f0 ET |
472 | static void kvm_mmu_notifier_invalidate_range(struct mmu_notifier *mn, |
473 | struct mm_struct *mm, | |
474 | unsigned long start, unsigned long end) | |
475 | { | |
476 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
477 | int idx; | |
478 | ||
479 | idx = srcu_read_lock(&kvm->srcu); | |
480 | kvm_arch_mmu_notifier_invalidate_range(kvm, start, end); | |
481 | srcu_read_unlock(&kvm->srcu, idx); | |
482 | } | |
483 | ||
3039bcc7 SC |
484 | typedef bool (*hva_handler_t)(struct kvm *kvm, struct kvm_gfn_range *range); |
485 | ||
f922bd9b SC |
486 | typedef void (*on_lock_fn_t)(struct kvm *kvm, unsigned long start, |
487 | unsigned long end); | |
488 | ||
3039bcc7 SC |
489 | struct kvm_hva_range { |
490 | unsigned long start; | |
491 | unsigned long end; | |
492 | pte_t pte; | |
493 | hva_handler_t handler; | |
f922bd9b | 494 | on_lock_fn_t on_lock; |
3039bcc7 SC |
495 | bool flush_on_ret; |
496 | bool may_block; | |
497 | }; | |
498 | ||
f922bd9b SC |
499 | /* |
500 | * Use a dedicated stub instead of NULL to indicate that there is no callback | |
501 | * function/handler. The compiler technically can't guarantee that a real | |
502 | * function will have a non-zero address, and so it will generate code to | |
503 | * check for !NULL, whereas comparing against a stub will be elided at compile | |
504 | * time (unless the compiler is getting long in the tooth, e.g. gcc 4.9). | |
505 | */ | |
506 | static void kvm_null_fn(void) | |
507 | { | |
508 | ||
509 | } | |
510 | #define IS_KVM_NULL_FN(fn) ((fn) == (void *)kvm_null_fn) | |
511 | ||
3039bcc7 SC |
512 | static __always_inline int __kvm_handle_hva_range(struct kvm *kvm, |
513 | const struct kvm_hva_range *range) | |
514 | { | |
8931a454 | 515 | bool ret = false, locked = false; |
f922bd9b | 516 | struct kvm_gfn_range gfn_range; |
3039bcc7 SC |
517 | struct kvm_memory_slot *slot; |
518 | struct kvm_memslots *slots; | |
3039bcc7 SC |
519 | int i, idx; |
520 | ||
f922bd9b SC |
521 | /* A null handler is allowed if and only if on_lock() is provided. */ |
522 | if (WARN_ON_ONCE(IS_KVM_NULL_FN(range->on_lock) && | |
523 | IS_KVM_NULL_FN(range->handler))) | |
524 | return 0; | |
525 | ||
3039bcc7 SC |
526 | idx = srcu_read_lock(&kvm->srcu); |
527 | ||
528 | for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++) { | |
529 | slots = __kvm_memslots(kvm, i); | |
530 | kvm_for_each_memslot(slot, slots) { | |
531 | unsigned long hva_start, hva_end; | |
532 | ||
533 | hva_start = max(range->start, slot->userspace_addr); | |
534 | hva_end = min(range->end, slot->userspace_addr + | |
535 | (slot->npages << PAGE_SHIFT)); | |
536 | if (hva_start >= hva_end) | |
537 | continue; | |
538 | ||
539 | /* | |
540 | * To optimize for the likely case where the address | |
541 | * range is covered by zero or one memslots, don't | |
542 | * bother making these conditional (to avoid writes on | |
543 | * the second or later invocation of the handler). | |
544 | */ | |
545 | gfn_range.pte = range->pte; | |
546 | gfn_range.may_block = range->may_block; | |
547 | ||
548 | /* | |
549 | * {gfn(page) | page intersects with [hva_start, hva_end)} = | |
550 | * {gfn_start, gfn_start+1, ..., gfn_end-1}. | |
551 | */ | |
552 | gfn_range.start = hva_to_gfn_memslot(hva_start, slot); | |
553 | gfn_range.end = hva_to_gfn_memslot(hva_end + PAGE_SIZE - 1, slot); | |
554 | gfn_range.slot = slot; | |
555 | ||
8931a454 SC |
556 | if (!locked) { |
557 | locked = true; | |
558 | KVM_MMU_LOCK(kvm); | |
071064f1 PB |
559 | if (!IS_KVM_NULL_FN(range->on_lock)) |
560 | range->on_lock(kvm, range->start, range->end); | |
561 | if (IS_KVM_NULL_FN(range->handler)) | |
562 | break; | |
8931a454 | 563 | } |
3039bcc7 SC |
564 | ret |= range->handler(kvm, &gfn_range); |
565 | } | |
566 | } | |
567 | ||
6bc6db00 | 568 | if (range->flush_on_ret && ret) |
3039bcc7 SC |
569 | kvm_flush_remote_tlbs(kvm); |
570 | ||
8931a454 SC |
571 | if (locked) |
572 | KVM_MMU_UNLOCK(kvm); | |
f922bd9b | 573 | |
3039bcc7 SC |
574 | srcu_read_unlock(&kvm->srcu, idx); |
575 | ||
576 | /* The notifiers are averse to booleans. :-( */ | |
577 | return (int)ret; | |
578 | } | |
579 | ||
580 | static __always_inline int kvm_handle_hva_range(struct mmu_notifier *mn, | |
581 | unsigned long start, | |
582 | unsigned long end, | |
583 | pte_t pte, | |
584 | hva_handler_t handler) | |
585 | { | |
586 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
587 | const struct kvm_hva_range range = { | |
588 | .start = start, | |
589 | .end = end, | |
590 | .pte = pte, | |
591 | .handler = handler, | |
f922bd9b | 592 | .on_lock = (void *)kvm_null_fn, |
3039bcc7 SC |
593 | .flush_on_ret = true, |
594 | .may_block = false, | |
595 | }; | |
3039bcc7 | 596 | |
f922bd9b | 597 | return __kvm_handle_hva_range(kvm, &range); |
3039bcc7 SC |
598 | } |
599 | ||
600 | static __always_inline int kvm_handle_hva_range_no_flush(struct mmu_notifier *mn, | |
601 | unsigned long start, | |
602 | unsigned long end, | |
603 | hva_handler_t handler) | |
604 | { | |
605 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
606 | const struct kvm_hva_range range = { | |
607 | .start = start, | |
608 | .end = end, | |
609 | .pte = __pte(0), | |
610 | .handler = handler, | |
f922bd9b | 611 | .on_lock = (void *)kvm_null_fn, |
3039bcc7 SC |
612 | .flush_on_ret = false, |
613 | .may_block = false, | |
614 | }; | |
3039bcc7 | 615 | |
f922bd9b | 616 | return __kvm_handle_hva_range(kvm, &range); |
3039bcc7 | 617 | } |
3da0dd43 IE |
618 | static void kvm_mmu_notifier_change_pte(struct mmu_notifier *mn, |
619 | struct mm_struct *mm, | |
620 | unsigned long address, | |
621 | pte_t pte) | |
622 | { | |
623 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
624 | ||
501b9185 SC |
625 | trace_kvm_set_spte_hva(address); |
626 | ||
c13fda23 | 627 | /* |
52ac8b35 | 628 | * .change_pte() must be surrounded by .invalidate_range_{start,end}(). |
071064f1 PB |
629 | * If mmu_notifier_count is zero, then no in-progress invalidations, |
630 | * including this one, found a relevant memslot at start(); rechecking | |
631 | * memslots here is unnecessary. Note, a false positive (count elevated | |
632 | * by a different invalidation) is sub-optimal but functionally ok. | |
c13fda23 | 633 | */ |
52ac8b35 | 634 | WARN_ON_ONCE(!READ_ONCE(kvm->mn_active_invalidate_count)); |
071064f1 PB |
635 | if (!READ_ONCE(kvm->mmu_notifier_count)) |
636 | return; | |
c13fda23 | 637 | |
3039bcc7 | 638 | kvm_handle_hva_range(mn, address, address + 1, pte, kvm_set_spte_gfn); |
3da0dd43 IE |
639 | } |
640 | ||
edb298c6 | 641 | void kvm_inc_notifier_count(struct kvm *kvm, unsigned long start, |
f922bd9b | 642 | unsigned long end) |
e930bffe | 643 | { |
e930bffe AA |
644 | /* |
645 | * The count increase must become visible at unlock time as no | |
646 | * spte can be established without taking the mmu_lock and | |
647 | * count is also read inside the mmu_lock critical section. | |
648 | */ | |
649 | kvm->mmu_notifier_count++; | |
4a42d848 | 650 | if (likely(kvm->mmu_notifier_count == 1)) { |
f922bd9b SC |
651 | kvm->mmu_notifier_range_start = start; |
652 | kvm->mmu_notifier_range_end = end; | |
4a42d848 DS |
653 | } else { |
654 | /* | |
655 | * Fully tracking multiple concurrent ranges has dimishing | |
656 | * returns. Keep things simple and just find the minimal range | |
657 | * which includes the current and new ranges. As there won't be | |
658 | * enough information to subtract a range after its invalidate | |
659 | * completes, any ranges invalidated concurrently will | |
660 | * accumulate and persist until all outstanding invalidates | |
661 | * complete. | |
662 | */ | |
663 | kvm->mmu_notifier_range_start = | |
f922bd9b | 664 | min(kvm->mmu_notifier_range_start, start); |
4a42d848 | 665 | kvm->mmu_notifier_range_end = |
f922bd9b | 666 | max(kvm->mmu_notifier_range_end, end); |
4a42d848 | 667 | } |
f922bd9b | 668 | } |
3039bcc7 | 669 | |
f922bd9b SC |
670 | static int kvm_mmu_notifier_invalidate_range_start(struct mmu_notifier *mn, |
671 | const struct mmu_notifier_range *range) | |
672 | { | |
673 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
674 | const struct kvm_hva_range hva_range = { | |
675 | .start = range->start, | |
676 | .end = range->end, | |
677 | .pte = __pte(0), | |
678 | .handler = kvm_unmap_gfn_range, | |
679 | .on_lock = kvm_inc_notifier_count, | |
680 | .flush_on_ret = true, | |
681 | .may_block = mmu_notifier_range_blockable(range), | |
682 | }; | |
565f3be2 | 683 | |
f922bd9b SC |
684 | trace_kvm_unmap_hva_range(range->start, range->end); |
685 | ||
52ac8b35 PB |
686 | /* |
687 | * Prevent memslot modification between range_start() and range_end() | |
688 | * so that conditionally locking provides the same result in both | |
689 | * functions. Without that guarantee, the mmu_notifier_count | |
690 | * adjustments will be imbalanced. | |
691 | * | |
692 | * Pairs with the decrement in range_end(). | |
693 | */ | |
694 | spin_lock(&kvm->mn_invalidate_lock); | |
695 | kvm->mn_active_invalidate_count++; | |
696 | spin_unlock(&kvm->mn_invalidate_lock); | |
697 | ||
f922bd9b | 698 | __kvm_handle_hva_range(kvm, &hva_range); |
93065ac7 | 699 | |
e649b3f0 | 700 | return 0; |
e930bffe AA |
701 | } |
702 | ||
edb298c6 | 703 | void kvm_dec_notifier_count(struct kvm *kvm, unsigned long start, |
f922bd9b | 704 | unsigned long end) |
e930bffe | 705 | { |
e930bffe AA |
706 | /* |
707 | * This sequence increase will notify the kvm page fault that | |
708 | * the page that is going to be mapped in the spte could have | |
709 | * been freed. | |
710 | */ | |
711 | kvm->mmu_notifier_seq++; | |
a355aa54 | 712 | smp_wmb(); |
e930bffe AA |
713 | /* |
714 | * The above sequence increase must be visible before the | |
a355aa54 PM |
715 | * below count decrease, which is ensured by the smp_wmb above |
716 | * in conjunction with the smp_rmb in mmu_notifier_retry(). | |
e930bffe AA |
717 | */ |
718 | kvm->mmu_notifier_count--; | |
f922bd9b SC |
719 | } |
720 | ||
721 | static void kvm_mmu_notifier_invalidate_range_end(struct mmu_notifier *mn, | |
722 | const struct mmu_notifier_range *range) | |
723 | { | |
724 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
725 | const struct kvm_hva_range hva_range = { | |
726 | .start = range->start, | |
727 | .end = range->end, | |
728 | .pte = __pte(0), | |
729 | .handler = (void *)kvm_null_fn, | |
730 | .on_lock = kvm_dec_notifier_count, | |
731 | .flush_on_ret = false, | |
732 | .may_block = mmu_notifier_range_blockable(range), | |
733 | }; | |
52ac8b35 | 734 | bool wake; |
f922bd9b SC |
735 | |
736 | __kvm_handle_hva_range(kvm, &hva_range); | |
e930bffe | 737 | |
52ac8b35 PB |
738 | /* Pairs with the increment in range_start(). */ |
739 | spin_lock(&kvm->mn_invalidate_lock); | |
740 | wake = (--kvm->mn_active_invalidate_count == 0); | |
741 | spin_unlock(&kvm->mn_invalidate_lock); | |
742 | ||
743 | /* | |
744 | * There can only be one waiter, since the wait happens under | |
745 | * slots_lock. | |
746 | */ | |
747 | if (wake) | |
748 | rcuwait_wake_up(&kvm->mn_memslots_update_rcuwait); | |
749 | ||
e930bffe AA |
750 | BUG_ON(kvm->mmu_notifier_count < 0); |
751 | } | |
752 | ||
753 | static int kvm_mmu_notifier_clear_flush_young(struct mmu_notifier *mn, | |
754 | struct mm_struct *mm, | |
57128468 ALC |
755 | unsigned long start, |
756 | unsigned long end) | |
e930bffe | 757 | { |
501b9185 SC |
758 | trace_kvm_age_hva(start, end); |
759 | ||
3039bcc7 | 760 | return kvm_handle_hva_range(mn, start, end, __pte(0), kvm_age_gfn); |
e930bffe AA |
761 | } |
762 | ||
1d7715c6 VD |
763 | static int kvm_mmu_notifier_clear_young(struct mmu_notifier *mn, |
764 | struct mm_struct *mm, | |
765 | unsigned long start, | |
766 | unsigned long end) | |
767 | { | |
501b9185 SC |
768 | trace_kvm_age_hva(start, end); |
769 | ||
1d7715c6 VD |
770 | /* |
771 | * Even though we do not flush TLB, this will still adversely | |
772 | * affect performance on pre-Haswell Intel EPT, where there is | |
773 | * no EPT Access Bit to clear so that we have to tear down EPT | |
774 | * tables instead. If we find this unacceptable, we can always | |
775 | * add a parameter to kvm_age_hva so that it effectively doesn't | |
776 | * do anything on clear_young. | |
777 | * | |
778 | * Also note that currently we never issue secondary TLB flushes | |
779 | * from clear_young, leaving this job up to the regular system | |
780 | * cadence. If we find this inaccurate, we might come up with a | |
781 | * more sophisticated heuristic later. | |
782 | */ | |
3039bcc7 | 783 | return kvm_handle_hva_range_no_flush(mn, start, end, kvm_age_gfn); |
1d7715c6 VD |
784 | } |
785 | ||
8ee53820 AA |
786 | static int kvm_mmu_notifier_test_young(struct mmu_notifier *mn, |
787 | struct mm_struct *mm, | |
788 | unsigned long address) | |
789 | { | |
501b9185 SC |
790 | trace_kvm_test_age_hva(address); |
791 | ||
3039bcc7 SC |
792 | return kvm_handle_hva_range_no_flush(mn, address, address + 1, |
793 | kvm_test_age_gfn); | |
8ee53820 AA |
794 | } |
795 | ||
85db06e5 MT |
796 | static void kvm_mmu_notifier_release(struct mmu_notifier *mn, |
797 | struct mm_struct *mm) | |
798 | { | |
799 | struct kvm *kvm = mmu_notifier_to_kvm(mn); | |
eda2beda LJ |
800 | int idx; |
801 | ||
802 | idx = srcu_read_lock(&kvm->srcu); | |
2df72e9b | 803 | kvm_arch_flush_shadow_all(kvm); |
eda2beda | 804 | srcu_read_unlock(&kvm->srcu, idx); |
85db06e5 MT |
805 | } |
806 | ||
e930bffe | 807 | static const struct mmu_notifier_ops kvm_mmu_notifier_ops = { |
e649b3f0 | 808 | .invalidate_range = kvm_mmu_notifier_invalidate_range, |
e930bffe AA |
809 | .invalidate_range_start = kvm_mmu_notifier_invalidate_range_start, |
810 | .invalidate_range_end = kvm_mmu_notifier_invalidate_range_end, | |
811 | .clear_flush_young = kvm_mmu_notifier_clear_flush_young, | |
1d7715c6 | 812 | .clear_young = kvm_mmu_notifier_clear_young, |
8ee53820 | 813 | .test_young = kvm_mmu_notifier_test_young, |
3da0dd43 | 814 | .change_pte = kvm_mmu_notifier_change_pte, |
85db06e5 | 815 | .release = kvm_mmu_notifier_release, |
e930bffe | 816 | }; |
4c07b0a4 AK |
817 | |
818 | static int kvm_init_mmu_notifier(struct kvm *kvm) | |
819 | { | |
820 | kvm->mmu_notifier.ops = &kvm_mmu_notifier_ops; | |
821 | return mmu_notifier_register(&kvm->mmu_notifier, current->mm); | |
822 | } | |
823 | ||
824 | #else /* !(CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER) */ | |
825 | ||
826 | static int kvm_init_mmu_notifier(struct kvm *kvm) | |
827 | { | |
828 | return 0; | |
829 | } | |
830 | ||
e930bffe AA |
831 | #endif /* CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER */ |
832 | ||
2fdef3a2 SS |
833 | #ifdef CONFIG_HAVE_KVM_PM_NOTIFIER |
834 | static int kvm_pm_notifier_call(struct notifier_block *bl, | |
835 | unsigned long state, | |
836 | void *unused) | |
837 | { | |
838 | struct kvm *kvm = container_of(bl, struct kvm, pm_notifier); | |
839 | ||
840 | return kvm_arch_pm_notifier(kvm, state); | |
841 | } | |
842 | ||
843 | static void kvm_init_pm_notifier(struct kvm *kvm) | |
844 | { | |
845 | kvm->pm_notifier.notifier_call = kvm_pm_notifier_call; | |
846 | /* Suspend KVM before we suspend ftrace, RCU, etc. */ | |
847 | kvm->pm_notifier.priority = INT_MAX; | |
848 | register_pm_notifier(&kvm->pm_notifier); | |
849 | } | |
850 | ||
851 | static void kvm_destroy_pm_notifier(struct kvm *kvm) | |
852 | { | |
853 | unregister_pm_notifier(&kvm->pm_notifier); | |
854 | } | |
855 | #else /* !CONFIG_HAVE_KVM_PM_NOTIFIER */ | |
856 | static void kvm_init_pm_notifier(struct kvm *kvm) | |
857 | { | |
858 | } | |
859 | ||
860 | static void kvm_destroy_pm_notifier(struct kvm *kvm) | |
861 | { | |
862 | } | |
863 | #endif /* CONFIG_HAVE_KVM_PM_NOTIFIER */ | |
864 | ||
a47d2b07 | 865 | static struct kvm_memslots *kvm_alloc_memslots(void) |
bf3e05bc XG |
866 | { |
867 | int i; | |
a47d2b07 | 868 | struct kvm_memslots *slots; |
bf3e05bc | 869 | |
b12ce36a | 870 | slots = kvzalloc(sizeof(struct kvm_memslots), GFP_KERNEL_ACCOUNT); |
a47d2b07 PB |
871 | if (!slots) |
872 | return NULL; | |
873 | ||
bf3e05bc | 874 | for (i = 0; i < KVM_MEM_SLOTS_NUM; i++) |
36947254 | 875 | slots->id_to_index[i] = -1; |
a47d2b07 PB |
876 | |
877 | return slots; | |
878 | } | |
879 | ||
880 | static void kvm_destroy_dirty_bitmap(struct kvm_memory_slot *memslot) | |
881 | { | |
882 | if (!memslot->dirty_bitmap) | |
883 | return; | |
884 | ||
885 | kvfree(memslot->dirty_bitmap); | |
886 | memslot->dirty_bitmap = NULL; | |
887 | } | |
888 | ||
e96c81ee | 889 | static void kvm_free_memslot(struct kvm *kvm, struct kvm_memory_slot *slot) |
a47d2b07 | 890 | { |
e96c81ee | 891 | kvm_destroy_dirty_bitmap(slot); |
a47d2b07 | 892 | |
e96c81ee | 893 | kvm_arch_free_memslot(kvm, slot); |
a47d2b07 | 894 | |
e96c81ee SC |
895 | slot->flags = 0; |
896 | slot->npages = 0; | |
a47d2b07 PB |
897 | } |
898 | ||
899 | static void kvm_free_memslots(struct kvm *kvm, struct kvm_memslots *slots) | |
900 | { | |
901 | struct kvm_memory_slot *memslot; | |
902 | ||
903 | if (!slots) | |
904 | return; | |
905 | ||
906 | kvm_for_each_memslot(memslot, slots) | |
e96c81ee | 907 | kvm_free_memslot(kvm, memslot); |
a47d2b07 PB |
908 | |
909 | kvfree(slots); | |
bf3e05bc XG |
910 | } |
911 | ||
bc9e9e67 JZ |
912 | static umode_t kvm_stats_debugfs_mode(const struct _kvm_stats_desc *pdesc) |
913 | { | |
914 | switch (pdesc->desc.flags & KVM_STATS_TYPE_MASK) { | |
915 | case KVM_STATS_TYPE_INSTANT: | |
916 | return 0444; | |
917 | case KVM_STATS_TYPE_CUMULATIVE: | |
918 | case KVM_STATS_TYPE_PEAK: | |
919 | default: | |
920 | return 0644; | |
921 | } | |
922 | } | |
923 | ||
924 | ||
536a6f88 JF |
925 | static void kvm_destroy_vm_debugfs(struct kvm *kvm) |
926 | { | |
927 | int i; | |
bc9e9e67 JZ |
928 | int kvm_debugfs_num_entries = kvm_vm_stats_header.num_desc + |
929 | kvm_vcpu_stats_header.num_desc; | |
536a6f88 JF |
930 | |
931 | if (!kvm->debugfs_dentry) | |
932 | return; | |
933 | ||
934 | debugfs_remove_recursive(kvm->debugfs_dentry); | |
935 | ||
9d5a1dce LC |
936 | if (kvm->debugfs_stat_data) { |
937 | for (i = 0; i < kvm_debugfs_num_entries; i++) | |
938 | kfree(kvm->debugfs_stat_data[i]); | |
939 | kfree(kvm->debugfs_stat_data); | |
940 | } | |
536a6f88 JF |
941 | } |
942 | ||
943 | static int kvm_create_vm_debugfs(struct kvm *kvm, int fd) | |
944 | { | |
85cd39af PB |
945 | static DEFINE_MUTEX(kvm_debugfs_lock); |
946 | struct dentry *dent; | |
536a6f88 JF |
947 | char dir_name[ITOA_MAX_LEN * 2]; |
948 | struct kvm_stat_data *stat_data; | |
bc9e9e67 | 949 | const struct _kvm_stats_desc *pdesc; |
3165af73 | 950 | int i, ret; |
bc9e9e67 JZ |
951 | int kvm_debugfs_num_entries = kvm_vm_stats_header.num_desc + |
952 | kvm_vcpu_stats_header.num_desc; | |
536a6f88 JF |
953 | |
954 | if (!debugfs_initialized()) | |
955 | return 0; | |
956 | ||
957 | snprintf(dir_name, sizeof(dir_name), "%d-%d", task_pid_nr(current), fd); | |
85cd39af PB |
958 | mutex_lock(&kvm_debugfs_lock); |
959 | dent = debugfs_lookup(dir_name, kvm_debugfs_dir); | |
960 | if (dent) { | |
961 | pr_warn_ratelimited("KVM: debugfs: duplicate directory %s\n", dir_name); | |
962 | dput(dent); | |
963 | mutex_unlock(&kvm_debugfs_lock); | |
964 | return 0; | |
965 | } | |
966 | dent = debugfs_create_dir(dir_name, kvm_debugfs_dir); | |
967 | mutex_unlock(&kvm_debugfs_lock); | |
968 | if (IS_ERR(dent)) | |
969 | return 0; | |
536a6f88 | 970 | |
85cd39af | 971 | kvm->debugfs_dentry = dent; |
536a6f88 JF |
972 | kvm->debugfs_stat_data = kcalloc(kvm_debugfs_num_entries, |
973 | sizeof(*kvm->debugfs_stat_data), | |
b12ce36a | 974 | GFP_KERNEL_ACCOUNT); |
536a6f88 JF |
975 | if (!kvm->debugfs_stat_data) |
976 | return -ENOMEM; | |
977 | ||
bc9e9e67 JZ |
978 | for (i = 0; i < kvm_vm_stats_header.num_desc; ++i) { |
979 | pdesc = &kvm_vm_stats_desc[i]; | |
b12ce36a | 980 | stat_data = kzalloc(sizeof(*stat_data), GFP_KERNEL_ACCOUNT); |
536a6f88 JF |
981 | if (!stat_data) |
982 | return -ENOMEM; | |
983 | ||
984 | stat_data->kvm = kvm; | |
bc9e9e67 JZ |
985 | stat_data->desc = pdesc; |
986 | stat_data->kind = KVM_STAT_VM; | |
987 | kvm->debugfs_stat_data[i] = stat_data; | |
988 | debugfs_create_file(pdesc->name, kvm_stats_debugfs_mode(pdesc), | |
989 | kvm->debugfs_dentry, stat_data, | |
990 | &stat_fops_per_vm); | |
991 | } | |
992 | ||
993 | for (i = 0; i < kvm_vcpu_stats_header.num_desc; ++i) { | |
994 | pdesc = &kvm_vcpu_stats_desc[i]; | |
b12ce36a | 995 | stat_data = kzalloc(sizeof(*stat_data), GFP_KERNEL_ACCOUNT); |
536a6f88 JF |
996 | if (!stat_data) |
997 | return -ENOMEM; | |
998 | ||
999 | stat_data->kvm = kvm; | |
bc9e9e67 JZ |
1000 | stat_data->desc = pdesc; |
1001 | stat_data->kind = KVM_STAT_VCPU; | |
004d62eb | 1002 | kvm->debugfs_stat_data[i + kvm_vm_stats_header.num_desc] = stat_data; |
bc9e9e67 | 1003 | debugfs_create_file(pdesc->name, kvm_stats_debugfs_mode(pdesc), |
09cbcef6 MP |
1004 | kvm->debugfs_dentry, stat_data, |
1005 | &stat_fops_per_vm); | |
536a6f88 | 1006 | } |
3165af73 PX |
1007 | |
1008 | ret = kvm_arch_create_vm_debugfs(kvm); | |
1009 | if (ret) { | |
1010 | kvm_destroy_vm_debugfs(kvm); | |
1011 | return i; | |
1012 | } | |
1013 | ||
536a6f88 JF |
1014 | return 0; |
1015 | } | |
1016 | ||
1aa9b957 JS |
1017 | /* |
1018 | * Called after the VM is otherwise initialized, but just before adding it to | |
1019 | * the vm_list. | |
1020 | */ | |
1021 | int __weak kvm_arch_post_init_vm(struct kvm *kvm) | |
1022 | { | |
1023 | return 0; | |
1024 | } | |
1025 | ||
1026 | /* | |
1027 | * Called just after removing the VM from the vm_list, but before doing any | |
1028 | * other destruction. | |
1029 | */ | |
1030 | void __weak kvm_arch_pre_destroy_vm(struct kvm *kvm) | |
1031 | { | |
1032 | } | |
1033 | ||
3165af73 PX |
1034 | /* |
1035 | * Called after per-vm debugfs created. When called kvm->debugfs_dentry should | |
1036 | * be setup already, so we can create arch-specific debugfs entries under it. | |
1037 | * Cleanup should be automatic done in kvm_destroy_vm_debugfs() recursively, so | |
1038 | * a per-arch destroy interface is not needed. | |
1039 | */ | |
1040 | int __weak kvm_arch_create_vm_debugfs(struct kvm *kvm) | |
1041 | { | |
1042 | return 0; | |
1043 | } | |
1044 | ||
e08b9637 | 1045 | static struct kvm *kvm_create_vm(unsigned long type) |
6aa8b732 | 1046 | { |
d89f5eff | 1047 | struct kvm *kvm = kvm_arch_alloc_vm(); |
9121923c JM |
1048 | int r = -ENOMEM; |
1049 | int i; | |
6aa8b732 | 1050 | |
d89f5eff JK |
1051 | if (!kvm) |
1052 | return ERR_PTR(-ENOMEM); | |
1053 | ||
531810ca | 1054 | KVM_MMU_LOCK_INIT(kvm); |
f1f10076 | 1055 | mmgrab(current->mm); |
e9ad4ec8 PB |
1056 | kvm->mm = current->mm; |
1057 | kvm_eventfd_init(kvm); | |
1058 | mutex_init(&kvm->lock); | |
1059 | mutex_init(&kvm->irq_lock); | |
1060 | mutex_init(&kvm->slots_lock); | |
b10a038e | 1061 | mutex_init(&kvm->slots_arch_lock); |
52ac8b35 PB |
1062 | spin_lock_init(&kvm->mn_invalidate_lock); |
1063 | rcuwait_init(&kvm->mn_memslots_update_rcuwait); | |
1064 | ||
e9ad4ec8 PB |
1065 | INIT_LIST_HEAD(&kvm->devices); |
1066 | ||
1e702d9a AW |
1067 | BUILD_BUG_ON(KVM_MEM_SLOTS_NUM > SHRT_MAX); |
1068 | ||
8a44119a PB |
1069 | if (init_srcu_struct(&kvm->srcu)) |
1070 | goto out_err_no_srcu; | |
1071 | if (init_srcu_struct(&kvm->irq_srcu)) | |
1072 | goto out_err_no_irq_srcu; | |
1073 | ||
e2d3fcaf | 1074 | refcount_set(&kvm->users_count, 1); |
f481b069 | 1075 | for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++) { |
4bd518f1 | 1076 | struct kvm_memslots *slots = kvm_alloc_memslots(); |
9121923c | 1077 | |
4bd518f1 | 1078 | if (!slots) |
a97b0e77 | 1079 | goto out_err_no_arch_destroy_vm; |
0e32958e | 1080 | /* Generations must be different for each address space. */ |
164bf7e5 | 1081 | slots->generation = i; |
4bd518f1 | 1082 | rcu_assign_pointer(kvm->memslots[i], slots); |
f481b069 | 1083 | } |
00f034a1 | 1084 | |
e93f8a0f | 1085 | for (i = 0; i < KVM_NR_BUSES; i++) { |
4a12f951 | 1086 | rcu_assign_pointer(kvm->buses[i], |
b12ce36a | 1087 | kzalloc(sizeof(struct kvm_io_bus), GFP_KERNEL_ACCOUNT)); |
57e7fbee | 1088 | if (!kvm->buses[i]) |
a97b0e77 | 1089 | goto out_err_no_arch_destroy_vm; |
e93f8a0f | 1090 | } |
e930bffe | 1091 | |
acd05785 DM |
1092 | kvm->max_halt_poll_ns = halt_poll_ns; |
1093 | ||
e08b9637 | 1094 | r = kvm_arch_init_vm(kvm, type); |
d89f5eff | 1095 | if (r) |
a97b0e77 | 1096 | goto out_err_no_arch_destroy_vm; |
10474ae8 AG |
1097 | |
1098 | r = hardware_enable_all(); | |
1099 | if (r) | |
719d93cd | 1100 | goto out_err_no_disable; |
10474ae8 | 1101 | |
c77dcacb | 1102 | #ifdef CONFIG_HAVE_KVM_IRQFD |
136bdfee | 1103 | INIT_HLIST_HEAD(&kvm->irq_ack_notifier_list); |
75858a84 | 1104 | #endif |
6aa8b732 | 1105 | |
74b5c5bf | 1106 | r = kvm_init_mmu_notifier(kvm); |
1aa9b957 JS |
1107 | if (r) |
1108 | goto out_err_no_mmu_notifier; | |
1109 | ||
1110 | r = kvm_arch_post_init_vm(kvm); | |
74b5c5bf MW |
1111 | if (r) |
1112 | goto out_err; | |
1113 | ||
0d9ce162 | 1114 | mutex_lock(&kvm_lock); |
5e58cfe4 | 1115 | list_add(&kvm->vm_list, &vm_list); |
0d9ce162 | 1116 | mutex_unlock(&kvm_lock); |
d89f5eff | 1117 | |
2ecd9d29 | 1118 | preempt_notifier_inc(); |
2fdef3a2 | 1119 | kvm_init_pm_notifier(kvm); |
2ecd9d29 | 1120 | |
f17abe9a | 1121 | return kvm; |
10474ae8 AG |
1122 | |
1123 | out_err: | |
1aa9b957 JS |
1124 | #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER) |
1125 | if (kvm->mmu_notifier.ops) | |
1126 | mmu_notifier_unregister(&kvm->mmu_notifier, current->mm); | |
1127 | #endif | |
1128 | out_err_no_mmu_notifier: | |
10474ae8 | 1129 | hardware_disable_all(); |
719d93cd | 1130 | out_err_no_disable: |
a97b0e77 | 1131 | kvm_arch_destroy_vm(kvm); |
a97b0e77 | 1132 | out_err_no_arch_destroy_vm: |
e2d3fcaf | 1133 | WARN_ON_ONCE(!refcount_dec_and_test(&kvm->users_count)); |
e93f8a0f | 1134 | for (i = 0; i < KVM_NR_BUSES; i++) |
3898da94 | 1135 | kfree(kvm_get_bus(kvm, i)); |
f481b069 | 1136 | for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++) |
3898da94 | 1137 | kvm_free_memslots(kvm, __kvm_memslots(kvm, i)); |
8a44119a PB |
1138 | cleanup_srcu_struct(&kvm->irq_srcu); |
1139 | out_err_no_irq_srcu: | |
1140 | cleanup_srcu_struct(&kvm->srcu); | |
1141 | out_err_no_srcu: | |
d89f5eff | 1142 | kvm_arch_free_vm(kvm); |
e9ad4ec8 | 1143 | mmdrop(current->mm); |
10474ae8 | 1144 | return ERR_PTR(r); |
f17abe9a AK |
1145 | } |
1146 | ||
07f0a7bd SW |
1147 | static void kvm_destroy_devices(struct kvm *kvm) |
1148 | { | |
e6e3b5a6 | 1149 | struct kvm_device *dev, *tmp; |
07f0a7bd | 1150 | |
a28ebea2 CD |
1151 | /* |
1152 | * We do not need to take the kvm->lock here, because nobody else | |
1153 | * has a reference to the struct kvm at this point and therefore | |
1154 | * cannot access the devices list anyhow. | |
1155 | */ | |
e6e3b5a6 GT |
1156 | list_for_each_entry_safe(dev, tmp, &kvm->devices, vm_node) { |
1157 | list_del(&dev->vm_node); | |
07f0a7bd SW |
1158 | dev->ops->destroy(dev); |
1159 | } | |
1160 | } | |
1161 | ||
f17abe9a AK |
1162 | static void kvm_destroy_vm(struct kvm *kvm) |
1163 | { | |
e93f8a0f | 1164 | int i; |
6d4e4c4f AK |
1165 | struct mm_struct *mm = kvm->mm; |
1166 | ||
2fdef3a2 | 1167 | kvm_destroy_pm_notifier(kvm); |
286de8f6 | 1168 | kvm_uevent_notify_change(KVM_EVENT_DESTROY_VM, kvm); |
536a6f88 | 1169 | kvm_destroy_vm_debugfs(kvm); |
ad8ba2cd | 1170 | kvm_arch_sync_events(kvm); |
0d9ce162 | 1171 | mutex_lock(&kvm_lock); |
133de902 | 1172 | list_del(&kvm->vm_list); |
0d9ce162 | 1173 | mutex_unlock(&kvm_lock); |
1aa9b957 JS |
1174 | kvm_arch_pre_destroy_vm(kvm); |
1175 | ||
399ec807 | 1176 | kvm_free_irq_routing(kvm); |
df630b8c | 1177 | for (i = 0; i < KVM_NR_BUSES; i++) { |
3898da94 | 1178 | struct kvm_io_bus *bus = kvm_get_bus(kvm, i); |
4a12f951 | 1179 | |
4a12f951 CB |
1180 | if (bus) |
1181 | kvm_io_bus_destroy(bus); | |
df630b8c PX |
1182 | kvm->buses[i] = NULL; |
1183 | } | |
980da6ce | 1184 | kvm_coalesced_mmio_free(kvm); |
e930bffe AA |
1185 | #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER) |
1186 | mmu_notifier_unregister(&kvm->mmu_notifier, kvm->mm); | |
52ac8b35 PB |
1187 | /* |
1188 | * At this point, pending calls to invalidate_range_start() | |
1189 | * have completed but no more MMU notifiers will run, so | |
1190 | * mn_active_invalidate_count may remain unbalanced. | |
1191 | * No threads can be waiting in install_new_memslots as the | |
1192 | * last reference on KVM has been dropped, but freeing | |
1193 | * memslots would deadlock without this manual intervention. | |
1194 | */ | |
1195 | WARN_ON(rcuwait_active(&kvm->mn_memslots_update_rcuwait)); | |
1196 | kvm->mn_active_invalidate_count = 0; | |
f00be0ca | 1197 | #else |
2df72e9b | 1198 | kvm_arch_flush_shadow_all(kvm); |
5f94c174 | 1199 | #endif |
d19a9cd2 | 1200 | kvm_arch_destroy_vm(kvm); |
07f0a7bd | 1201 | kvm_destroy_devices(kvm); |
f481b069 | 1202 | for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++) |
3898da94 | 1203 | kvm_free_memslots(kvm, __kvm_memslots(kvm, i)); |
820b3fcd | 1204 | cleanup_srcu_struct(&kvm->irq_srcu); |
d89f5eff JK |
1205 | cleanup_srcu_struct(&kvm->srcu); |
1206 | kvm_arch_free_vm(kvm); | |
2ecd9d29 | 1207 | preempt_notifier_dec(); |
10474ae8 | 1208 | hardware_disable_all(); |
6d4e4c4f | 1209 | mmdrop(mm); |
f17abe9a AK |
1210 | } |
1211 | ||
d39f13b0 IE |
1212 | void kvm_get_kvm(struct kvm *kvm) |
1213 | { | |
e3736c3e | 1214 | refcount_inc(&kvm->users_count); |
d39f13b0 IE |
1215 | } |
1216 | EXPORT_SYMBOL_GPL(kvm_get_kvm); | |
1217 | ||
605c7130 PX |
1218 | /* |
1219 | * Make sure the vm is not during destruction, which is a safe version of | |
1220 | * kvm_get_kvm(). Return true if kvm referenced successfully, false otherwise. | |
1221 | */ | |
1222 | bool kvm_get_kvm_safe(struct kvm *kvm) | |
1223 | { | |
1224 | return refcount_inc_not_zero(&kvm->users_count); | |
1225 | } | |
1226 | EXPORT_SYMBOL_GPL(kvm_get_kvm_safe); | |
1227 | ||
d39f13b0 IE |
1228 | void kvm_put_kvm(struct kvm *kvm) |
1229 | { | |
e3736c3e | 1230 | if (refcount_dec_and_test(&kvm->users_count)) |
d39f13b0 IE |
1231 | kvm_destroy_vm(kvm); |
1232 | } | |
1233 | EXPORT_SYMBOL_GPL(kvm_put_kvm); | |
1234 | ||
149487bd SC |
1235 | /* |
1236 | * Used to put a reference that was taken on behalf of an object associated | |
1237 | * with a user-visible file descriptor, e.g. a vcpu or device, if installation | |
1238 | * of the new file descriptor fails and the reference cannot be transferred to | |
1239 | * its final owner. In such cases, the caller is still actively using @kvm and | |
1240 | * will fail miserably if the refcount unexpectedly hits zero. | |
1241 | */ | |
1242 | void kvm_put_kvm_no_destroy(struct kvm *kvm) | |
1243 | { | |
1244 | WARN_ON(refcount_dec_and_test(&kvm->users_count)); | |
1245 | } | |
1246 | EXPORT_SYMBOL_GPL(kvm_put_kvm_no_destroy); | |
d39f13b0 | 1247 | |
f17abe9a AK |
1248 | static int kvm_vm_release(struct inode *inode, struct file *filp) |
1249 | { | |
1250 | struct kvm *kvm = filp->private_data; | |
1251 | ||
721eecbf GH |
1252 | kvm_irqfd_release(kvm); |
1253 | ||
d39f13b0 | 1254 | kvm_put_kvm(kvm); |
6aa8b732 AK |
1255 | return 0; |
1256 | } | |
1257 | ||
515a0127 TY |
1258 | /* |
1259 | * Allocation size is twice as large as the actual dirty bitmap size. | |
0dff0846 | 1260 | * See kvm_vm_ioctl_get_dirty_log() why this is needed. |
515a0127 | 1261 | */ |
3c9bd400 | 1262 | static int kvm_alloc_dirty_bitmap(struct kvm_memory_slot *memslot) |
a36a57b1 | 1263 | { |
515a0127 | 1264 | unsigned long dirty_bytes = 2 * kvm_dirty_bitmap_bytes(memslot); |
a36a57b1 | 1265 | |
b12ce36a | 1266 | memslot->dirty_bitmap = kvzalloc(dirty_bytes, GFP_KERNEL_ACCOUNT); |
a36a57b1 TY |
1267 | if (!memslot->dirty_bitmap) |
1268 | return -ENOMEM; | |
1269 | ||
a36a57b1 TY |
1270 | return 0; |
1271 | } | |
1272 | ||
bf3e05bc | 1273 | /* |
0577d1ab SC |
1274 | * Delete a memslot by decrementing the number of used slots and shifting all |
1275 | * other entries in the array forward one spot. | |
bf3e05bc | 1276 | */ |
0577d1ab SC |
1277 | static inline void kvm_memslot_delete(struct kvm_memslots *slots, |
1278 | struct kvm_memory_slot *memslot) | |
bf3e05bc | 1279 | { |
063584d4 | 1280 | struct kvm_memory_slot *mslots = slots->memslots; |
0577d1ab | 1281 | int i; |
f85e2cb5 | 1282 | |
0577d1ab SC |
1283 | if (WARN_ON(slots->id_to_index[memslot->id] == -1)) |
1284 | return; | |
0e60b079 | 1285 | |
0577d1ab SC |
1286 | slots->used_slots--; |
1287 | ||
87689270 DM |
1288 | if (atomic_read(&slots->last_used_slot) >= slots->used_slots) |
1289 | atomic_set(&slots->last_used_slot, 0); | |
0774a964 | 1290 | |
0577d1ab | 1291 | for (i = slots->id_to_index[memslot->id]; i < slots->used_slots; i++) { |
7f379cff IM |
1292 | mslots[i] = mslots[i + 1]; |
1293 | slots->id_to_index[mslots[i].id] = i; | |
7f379cff | 1294 | } |
0577d1ab SC |
1295 | mslots[i] = *memslot; |
1296 | slots->id_to_index[memslot->id] = -1; | |
1297 | } | |
1298 | ||
1299 | /* | |
1300 | * "Insert" a new memslot by incrementing the number of used slots. Returns | |
1301 | * the new slot's initial index into the memslots array. | |
1302 | */ | |
1303 | static inline int kvm_memslot_insert_back(struct kvm_memslots *slots) | |
1304 | { | |
1305 | return slots->used_slots++; | |
1306 | } | |
1307 | ||
1308 | /* | |
1309 | * Move a changed memslot backwards in the array by shifting existing slots | |
1310 | * with a higher GFN toward the front of the array. Note, the changed memslot | |
1311 | * itself is not preserved in the array, i.e. not swapped at this time, only | |
1312 | * its new index into the array is tracked. Returns the changed memslot's | |
1313 | * current index into the memslots array. | |
1314 | */ | |
1315 | static inline int kvm_memslot_move_backward(struct kvm_memslots *slots, | |
1316 | struct kvm_memory_slot *memslot) | |
1317 | { | |
1318 | struct kvm_memory_slot *mslots = slots->memslots; | |
1319 | int i; | |
1320 | ||
1321 | if (WARN_ON_ONCE(slots->id_to_index[memslot->id] == -1) || | |
1322 | WARN_ON_ONCE(!slots->used_slots)) | |
1323 | return -1; | |
efbeec70 PB |
1324 | |
1325 | /* | |
0577d1ab SC |
1326 | * Move the target memslot backward in the array by shifting existing |
1327 | * memslots with a higher GFN (than the target memslot) towards the | |
1328 | * front of the array. | |
efbeec70 | 1329 | */ |
0577d1ab SC |
1330 | for (i = slots->id_to_index[memslot->id]; i < slots->used_slots - 1; i++) { |
1331 | if (memslot->base_gfn > mslots[i + 1].base_gfn) | |
1332 | break; | |
1333 | ||
1334 | WARN_ON_ONCE(memslot->base_gfn == mslots[i + 1].base_gfn); | |
f85e2cb5 | 1335 | |
0577d1ab SC |
1336 | /* Shift the next memslot forward one and update its index. */ |
1337 | mslots[i] = mslots[i + 1]; | |
1338 | slots->id_to_index[mslots[i].id] = i; | |
1339 | } | |
1340 | return i; | |
1341 | } | |
1342 | ||
1343 | /* | |
1344 | * Move a changed memslot forwards in the array by shifting existing slots with | |
1345 | * a lower GFN toward the back of the array. Note, the changed memslot itself | |
1346 | * is not preserved in the array, i.e. not swapped at this time, only its new | |
1347 | * index into the array is tracked. Returns the changed memslot's final index | |
1348 | * into the memslots array. | |
1349 | */ | |
1350 | static inline int kvm_memslot_move_forward(struct kvm_memslots *slots, | |
1351 | struct kvm_memory_slot *memslot, | |
1352 | int start) | |
1353 | { | |
1354 | struct kvm_memory_slot *mslots = slots->memslots; | |
1355 | int i; | |
1356 | ||
1357 | for (i = start; i > 0; i--) { | |
1358 | if (memslot->base_gfn < mslots[i - 1].base_gfn) | |
1359 | break; | |
1360 | ||
1361 | WARN_ON_ONCE(memslot->base_gfn == mslots[i - 1].base_gfn); | |
1362 | ||
1363 | /* Shift the next memslot back one and update its index. */ | |
1364 | mslots[i] = mslots[i - 1]; | |
1365 | slots->id_to_index[mslots[i].id] = i; | |
1366 | } | |
1367 | return i; | |
1368 | } | |
1369 | ||
1370 | /* | |
1371 | * Re-sort memslots based on their GFN to account for an added, deleted, or | |
1372 | * moved memslot. Sorting memslots by GFN allows using a binary search during | |
1373 | * memslot lookup. | |
1374 | * | |
1375 | * IMPORTANT: Slots are sorted from highest GFN to lowest GFN! I.e. the entry | |
1376 | * at memslots[0] has the highest GFN. | |
1377 | * | |
1378 | * The sorting algorithm takes advantage of having initially sorted memslots | |
1379 | * and knowing the position of the changed memslot. Sorting is also optimized | |
1380 | * by not swapping the updated memslot and instead only shifting other memslots | |
1381 | * and tracking the new index for the update memslot. Only once its final | |
1382 | * index is known is the updated memslot copied into its position in the array. | |
1383 | * | |
1384 | * - When deleting a memslot, the deleted memslot simply needs to be moved to | |
1385 | * the end of the array. | |
1386 | * | |
1387 | * - When creating a memslot, the algorithm "inserts" the new memslot at the | |
1388 | * end of the array and then it forward to its correct location. | |
1389 | * | |
1390 | * - When moving a memslot, the algorithm first moves the updated memslot | |
1391 | * backward to handle the scenario where the memslot's GFN was changed to a | |
1392 | * lower value. update_memslots() then falls through and runs the same flow | |
1393 | * as creating a memslot to move the memslot forward to handle the scenario | |
1394 | * where its GFN was changed to a higher value. | |
1395 | * | |
1396 | * Note, slots are sorted from highest->lowest instead of lowest->highest for | |
1397 | * historical reasons. Originally, invalid memslots where denoted by having | |
1398 | * GFN=0, thus sorting from highest->lowest naturally sorted invalid memslots | |
1399 | * to the end of the array. The current algorithm uses dedicated logic to | |
1400 | * delete a memslot and thus does not rely on invalid memslots having GFN=0. | |
1401 | * | |
1402 | * The other historical motiviation for highest->lowest was to improve the | |
1403 | * performance of memslot lookup. KVM originally used a linear search starting | |
1404 | * at memslots[0]. On x86, the largest memslot usually has one of the highest, | |
1405 | * if not *the* highest, GFN, as the bulk of the guest's RAM is located in a | |
1406 | * single memslot above the 4gb boundary. As the largest memslot is also the | |
1407 | * most likely to be referenced, sorting it to the front of the array was | |
1408 | * advantageous. The current binary search starts from the middle of the array | |
1409 | * and uses an LRU pointer to improve performance for all memslots and GFNs. | |
1410 | */ | |
1411 | static void update_memslots(struct kvm_memslots *slots, | |
1412 | struct kvm_memory_slot *memslot, | |
1413 | enum kvm_mr_change change) | |
1414 | { | |
1415 | int i; | |
1416 | ||
1417 | if (change == KVM_MR_DELETE) { | |
1418 | kvm_memslot_delete(slots, memslot); | |
1419 | } else { | |
1420 | if (change == KVM_MR_CREATE) | |
1421 | i = kvm_memslot_insert_back(slots); | |
1422 | else | |
1423 | i = kvm_memslot_move_backward(slots, memslot); | |
1424 | i = kvm_memslot_move_forward(slots, memslot, i); | |
1425 | ||
1426 | /* | |
1427 | * Copy the memslot to its new position in memslots and update | |
1428 | * its index accordingly. | |
1429 | */ | |
1430 | slots->memslots[i] = *memslot; | |
1431 | slots->id_to_index[memslot->id] = i; | |
1432 | } | |
bf3e05bc XG |
1433 | } |
1434 | ||
09170a49 | 1435 | static int check_memory_region_flags(const struct kvm_userspace_memory_region *mem) |
a50d64d6 | 1436 | { |
4d8b81ab XG |
1437 | u32 valid_flags = KVM_MEM_LOG_DIRTY_PAGES; |
1438 | ||
0f8a4de3 | 1439 | #ifdef __KVM_HAVE_READONLY_MEM |
4d8b81ab XG |
1440 | valid_flags |= KVM_MEM_READONLY; |
1441 | #endif | |
1442 | ||
1443 | if (mem->flags & ~valid_flags) | |
a50d64d6 XG |
1444 | return -EINVAL; |
1445 | ||
1446 | return 0; | |
1447 | } | |
1448 | ||
7ec4fb44 | 1449 | static struct kvm_memslots *install_new_memslots(struct kvm *kvm, |
f481b069 | 1450 | int as_id, struct kvm_memslots *slots) |
7ec4fb44 | 1451 | { |
f481b069 | 1452 | struct kvm_memslots *old_memslots = __kvm_memslots(kvm, as_id); |
361209e0 | 1453 | u64 gen = old_memslots->generation; |
7ec4fb44 | 1454 | |
361209e0 SC |
1455 | WARN_ON(gen & KVM_MEMSLOT_GEN_UPDATE_IN_PROGRESS); |
1456 | slots->generation = gen | KVM_MEMSLOT_GEN_UPDATE_IN_PROGRESS; | |
ee3d1570 | 1457 | |
52ac8b35 PB |
1458 | /* |
1459 | * Do not store the new memslots while there are invalidations in | |
071064f1 PB |
1460 | * progress, otherwise the locking in invalidate_range_start and |
1461 | * invalidate_range_end will be unbalanced. | |
52ac8b35 PB |
1462 | */ |
1463 | spin_lock(&kvm->mn_invalidate_lock); | |
1464 | prepare_to_rcuwait(&kvm->mn_memslots_update_rcuwait); | |
1465 | while (kvm->mn_active_invalidate_count) { | |
1466 | set_current_state(TASK_UNINTERRUPTIBLE); | |
1467 | spin_unlock(&kvm->mn_invalidate_lock); | |
1468 | schedule(); | |
1469 | spin_lock(&kvm->mn_invalidate_lock); | |
1470 | } | |
1471 | finish_rcuwait(&kvm->mn_memslots_update_rcuwait); | |
f481b069 | 1472 | rcu_assign_pointer(kvm->memslots[as_id], slots); |
52ac8b35 | 1473 | spin_unlock(&kvm->mn_invalidate_lock); |
b10a038e BG |
1474 | |
1475 | /* | |
1476 | * Acquired in kvm_set_memslot. Must be released before synchronize | |
1477 | * SRCU below in order to avoid deadlock with another thread | |
1478 | * acquiring the slots_arch_lock in an srcu critical section. | |
1479 | */ | |
1480 | mutex_unlock(&kvm->slots_arch_lock); | |
1481 | ||
7ec4fb44 | 1482 | synchronize_srcu_expedited(&kvm->srcu); |
e59dbe09 | 1483 | |
ee3d1570 | 1484 | /* |
361209e0 | 1485 | * Increment the new memslot generation a second time, dropping the |
00116795 | 1486 | * update in-progress flag and incrementing the generation based on |
361209e0 SC |
1487 | * the number of address spaces. This provides a unique and easily |
1488 | * identifiable generation number while the memslots are in flux. | |
1489 | */ | |
1490 | gen = slots->generation & ~KVM_MEMSLOT_GEN_UPDATE_IN_PROGRESS; | |
1491 | ||
1492 | /* | |
4bd518f1 PB |
1493 | * Generations must be unique even across address spaces. We do not need |
1494 | * a global counter for that, instead the generation space is evenly split | |
1495 | * across address spaces. For example, with two address spaces, address | |
164bf7e5 SC |
1496 | * space 0 will use generations 0, 2, 4, ... while address space 1 will |
1497 | * use generations 1, 3, 5, ... | |
ee3d1570 | 1498 | */ |
164bf7e5 | 1499 | gen += KVM_ADDRESS_SPACE_NUM; |
ee3d1570 | 1500 | |
15248258 | 1501 | kvm_arch_memslots_updated(kvm, gen); |
ee3d1570 | 1502 | |
15248258 | 1503 | slots->generation = gen; |
e59dbe09 TY |
1504 | |
1505 | return old_memslots; | |
7ec4fb44 GN |
1506 | } |
1507 | ||
ddc12f2a BG |
1508 | static size_t kvm_memslots_size(int slots) |
1509 | { | |
1510 | return sizeof(struct kvm_memslots) + | |
1511 | (sizeof(struct kvm_memory_slot) * slots); | |
1512 | } | |
1513 | ||
1514 | static void kvm_copy_memslots(struct kvm_memslots *to, | |
1515 | struct kvm_memslots *from) | |
1516 | { | |
1517 | memcpy(to, from, kvm_memslots_size(from->used_slots)); | |
1518 | } | |
1519 | ||
36947254 SC |
1520 | /* |
1521 | * Note, at a minimum, the current number of used slots must be allocated, even | |
1522 | * when deleting a memslot, as we need a complete duplicate of the memslots for | |
1523 | * use when invalidating a memslot prior to deleting/moving the memslot. | |
1524 | */ | |
1525 | static struct kvm_memslots *kvm_dup_memslots(struct kvm_memslots *old, | |
1526 | enum kvm_mr_change change) | |
1527 | { | |
1528 | struct kvm_memslots *slots; | |
ddc12f2a | 1529 | size_t new_size; |
36947254 SC |
1530 | |
1531 | if (change == KVM_MR_CREATE) | |
ddc12f2a | 1532 | new_size = kvm_memslots_size(old->used_slots + 1); |
36947254 | 1533 | else |
ddc12f2a | 1534 | new_size = kvm_memslots_size(old->used_slots); |
36947254 SC |
1535 | |
1536 | slots = kvzalloc(new_size, GFP_KERNEL_ACCOUNT); | |
1537 | if (likely(slots)) | |
ddc12f2a | 1538 | kvm_copy_memslots(slots, old); |
36947254 SC |
1539 | |
1540 | return slots; | |
1541 | } | |
1542 | ||
cf47f50b SC |
1543 | static int kvm_set_memslot(struct kvm *kvm, |
1544 | const struct kvm_userspace_memory_region *mem, | |
9d4c197c | 1545 | struct kvm_memory_slot *old, |
cf47f50b SC |
1546 | struct kvm_memory_slot *new, int as_id, |
1547 | enum kvm_mr_change change) | |
1548 | { | |
1549 | struct kvm_memory_slot *slot; | |
1550 | struct kvm_memslots *slots; | |
1551 | int r; | |
1552 | ||
b10a038e BG |
1553 | /* |
1554 | * Released in install_new_memslots. | |
1555 | * | |
1556 | * Must be held from before the current memslots are copied until | |
1557 | * after the new memslots are installed with rcu_assign_pointer, | |
1558 | * then released before the synchronize srcu in install_new_memslots. | |
1559 | * | |
1560 | * When modifying memslots outside of the slots_lock, must be held | |
1561 | * before reading the pointer to the current memslots until after all | |
1562 | * changes to those memslots are complete. | |
1563 | * | |
1564 | * These rules ensure that installing new memslots does not lose | |
1565 | * changes made to the previous memslots. | |
1566 | */ | |
1567 | mutex_lock(&kvm->slots_arch_lock); | |
1568 | ||
36947254 | 1569 | slots = kvm_dup_memslots(__kvm_memslots(kvm, as_id), change); |
b10a038e BG |
1570 | if (!slots) { |
1571 | mutex_unlock(&kvm->slots_arch_lock); | |
cf47f50b | 1572 | return -ENOMEM; |
b10a038e | 1573 | } |
cf47f50b SC |
1574 | |
1575 | if (change == KVM_MR_DELETE || change == KVM_MR_MOVE) { | |
1576 | /* | |
1577 | * Note, the INVALID flag needs to be in the appropriate entry | |
1578 | * in the freshly allocated memslots, not in @old or @new. | |
1579 | */ | |
1580 | slot = id_to_memslot(slots, old->id); | |
1581 | slot->flags |= KVM_MEMSLOT_INVALID; | |
1582 | ||
1583 | /* | |
b10a038e BG |
1584 | * We can re-use the memory from the old memslots. |
1585 | * It will be overwritten with a copy of the new memslots | |
1586 | * after reacquiring the slots_arch_lock below. | |
cf47f50b SC |
1587 | */ |
1588 | slots = install_new_memslots(kvm, as_id, slots); | |
1589 | ||
1590 | /* From this point no new shadow pages pointing to a deleted, | |
1591 | * or moved, memslot will be created. | |
1592 | * | |
1593 | * validation of sp->gfn happens in: | |
1594 | * - gfn_to_hva (kvm_read_guest, gfn_to_pfn) | |
1595 | * - kvm_is_visible_gfn (mmu_check_root) | |
1596 | */ | |
1597 | kvm_arch_flush_shadow_memslot(kvm, slot); | |
b10a038e BG |
1598 | |
1599 | /* Released in install_new_memslots. */ | |
1600 | mutex_lock(&kvm->slots_arch_lock); | |
1601 | ||
1602 | /* | |
1603 | * The arch-specific fields of the memslots could have changed | |
1604 | * between releasing the slots_arch_lock in | |
1605 | * install_new_memslots and here, so get a fresh copy of the | |
1606 | * slots. | |
1607 | */ | |
1608 | kvm_copy_memslots(slots, __kvm_memslots(kvm, as_id)); | |
cf47f50b SC |
1609 | } |
1610 | ||
1611 | r = kvm_arch_prepare_memory_region(kvm, new, mem, change); | |
1612 | if (r) | |
1613 | goto out_slots; | |
1614 | ||
1615 | update_memslots(slots, new, change); | |
1616 | slots = install_new_memslots(kvm, as_id, slots); | |
1617 | ||
1618 | kvm_arch_commit_memory_region(kvm, mem, old, new, change); | |
1619 | ||
1620 | kvfree(slots); | |
1621 | return 0; | |
1622 | ||
1623 | out_slots: | |
b10a038e BG |
1624 | if (change == KVM_MR_DELETE || change == KVM_MR_MOVE) { |
1625 | slot = id_to_memslot(slots, old->id); | |
1626 | slot->flags &= ~KVM_MEMSLOT_INVALID; | |
cf47f50b | 1627 | slots = install_new_memslots(kvm, as_id, slots); |
b10a038e BG |
1628 | } else { |
1629 | mutex_unlock(&kvm->slots_arch_lock); | |
1630 | } | |
cf47f50b SC |
1631 | kvfree(slots); |
1632 | return r; | |
1633 | } | |
1634 | ||
5c0b4f3d SC |
1635 | static int kvm_delete_memslot(struct kvm *kvm, |
1636 | const struct kvm_userspace_memory_region *mem, | |
1637 | struct kvm_memory_slot *old, int as_id) | |
1638 | { | |
1639 | struct kvm_memory_slot new; | |
1640 | int r; | |
1641 | ||
1642 | if (!old->npages) | |
1643 | return -EINVAL; | |
1644 | ||
1645 | memset(&new, 0, sizeof(new)); | |
1646 | new.id = old->id; | |
9e9eb226 PX |
1647 | /* |
1648 | * This is only for debugging purpose; it should never be referenced | |
1649 | * for a removed memslot. | |
1650 | */ | |
1651 | new.as_id = as_id; | |
5c0b4f3d SC |
1652 | |
1653 | r = kvm_set_memslot(kvm, mem, old, &new, as_id, KVM_MR_DELETE); | |
1654 | if (r) | |
1655 | return r; | |
1656 | ||
e96c81ee | 1657 | kvm_free_memslot(kvm, old); |
5c0b4f3d SC |
1658 | return 0; |
1659 | } | |
1660 | ||
6aa8b732 AK |
1661 | /* |
1662 | * Allocate some memory and give it an address in the guest physical address | |
1663 | * space. | |
1664 | * | |
1665 | * Discontiguous memory is allowed, mostly for framebuffers. | |
f78e0e2e | 1666 | * |
02d5d55b | 1667 | * Must be called holding kvm->slots_lock for write. |
6aa8b732 | 1668 | */ |
f78e0e2e | 1669 | int __kvm_set_memory_region(struct kvm *kvm, |
09170a49 | 1670 | const struct kvm_userspace_memory_region *mem) |
6aa8b732 | 1671 | { |
6aa8b732 | 1672 | struct kvm_memory_slot old, new; |
163da372 | 1673 | struct kvm_memory_slot *tmp; |
f64c0398 | 1674 | enum kvm_mr_change change; |
163da372 SC |
1675 | int as_id, id; |
1676 | int r; | |
6aa8b732 | 1677 | |
a50d64d6 XG |
1678 | r = check_memory_region_flags(mem); |
1679 | if (r) | |
71a4c30b | 1680 | return r; |
a50d64d6 | 1681 | |
f481b069 PB |
1682 | as_id = mem->slot >> 16; |
1683 | id = (u16)mem->slot; | |
1684 | ||
6aa8b732 AK |
1685 | /* General sanity checks */ |
1686 | if (mem->memory_size & (PAGE_SIZE - 1)) | |
71a4c30b | 1687 | return -EINVAL; |
6aa8b732 | 1688 | if (mem->guest_phys_addr & (PAGE_SIZE - 1)) |
71a4c30b | 1689 | return -EINVAL; |
fa3d315a | 1690 | /* We can read the guest memory with __xxx_user() later on. */ |
09d952c9 | 1691 | if ((mem->userspace_addr & (PAGE_SIZE - 1)) || |
139bc8a6 | 1692 | (mem->userspace_addr != untagged_addr(mem->userspace_addr)) || |
96d4f267 | 1693 | !access_ok((void __user *)(unsigned long)mem->userspace_addr, |
09d952c9 | 1694 | mem->memory_size)) |
71a4c30b | 1695 | return -EINVAL; |
f481b069 | 1696 | if (as_id >= KVM_ADDRESS_SPACE_NUM || id >= KVM_MEM_SLOTS_NUM) |
71a4c30b | 1697 | return -EINVAL; |
6aa8b732 | 1698 | if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr) |
71a4c30b | 1699 | return -EINVAL; |
6aa8b732 | 1700 | |
5c0b4f3d SC |
1701 | /* |
1702 | * Make a full copy of the old memslot, the pointer will become stale | |
1703 | * when the memslots are re-sorted by update_memslots(), and the old | |
1704 | * memslot needs to be referenced after calling update_memslots(), e.g. | |
0dff0846 | 1705 | * to free its resources and for arch specific behavior. |
5c0b4f3d | 1706 | */ |
0577d1ab SC |
1707 | tmp = id_to_memslot(__kvm_memslots(kvm, as_id), id); |
1708 | if (tmp) { | |
1709 | old = *tmp; | |
1710 | tmp = NULL; | |
1711 | } else { | |
1712 | memset(&old, 0, sizeof(old)); | |
1713 | old.id = id; | |
1714 | } | |
163da372 | 1715 | |
5c0b4f3d SC |
1716 | if (!mem->memory_size) |
1717 | return kvm_delete_memslot(kvm, mem, &old, as_id); | |
1718 | ||
9e9eb226 | 1719 | new.as_id = as_id; |
f481b069 | 1720 | new.id = id; |
163da372 SC |
1721 | new.base_gfn = mem->guest_phys_addr >> PAGE_SHIFT; |
1722 | new.npages = mem->memory_size >> PAGE_SHIFT; | |
6aa8b732 | 1723 | new.flags = mem->flags; |
414de7ab | 1724 | new.userspace_addr = mem->userspace_addr; |
6aa8b732 | 1725 | |
163da372 SC |
1726 | if (new.npages > KVM_MEM_MAX_NR_PAGES) |
1727 | return -EINVAL; | |
1728 | ||
5c0b4f3d SC |
1729 | if (!old.npages) { |
1730 | change = KVM_MR_CREATE; | |
163da372 SC |
1731 | new.dirty_bitmap = NULL; |
1732 | memset(&new.arch, 0, sizeof(new.arch)); | |
5c0b4f3d SC |
1733 | } else { /* Modify an existing slot. */ |
1734 | if ((new.userspace_addr != old.userspace_addr) || | |
163da372 | 1735 | (new.npages != old.npages) || |
5c0b4f3d | 1736 | ((new.flags ^ old.flags) & KVM_MEM_READONLY)) |
71a4c30b | 1737 | return -EINVAL; |
09170a49 | 1738 | |
163da372 | 1739 | if (new.base_gfn != old.base_gfn) |
5c0b4f3d SC |
1740 | change = KVM_MR_MOVE; |
1741 | else if (new.flags != old.flags) | |
1742 | change = KVM_MR_FLAGS_ONLY; | |
1743 | else /* Nothing to change. */ | |
1744 | return 0; | |
163da372 SC |
1745 | |
1746 | /* Copy dirty_bitmap and arch from the current memslot. */ | |
1747 | new.dirty_bitmap = old.dirty_bitmap; | |
1748 | memcpy(&new.arch, &old.arch, sizeof(new.arch)); | |
09170a49 | 1749 | } |
6aa8b732 | 1750 | |
f64c0398 | 1751 | if ((change == KVM_MR_CREATE) || (change == KVM_MR_MOVE)) { |
0a706bee | 1752 | /* Check for overlaps */ |
163da372 SC |
1753 | kvm_for_each_memslot(tmp, __kvm_memslots(kvm, as_id)) { |
1754 | if (tmp->id == id) | |
0a706bee | 1755 | continue; |
163da372 SC |
1756 | if (!((new.base_gfn + new.npages <= tmp->base_gfn) || |
1757 | (new.base_gfn >= tmp->base_gfn + tmp->npages))) | |
71a4c30b | 1758 | return -EEXIST; |
0a706bee | 1759 | } |
6aa8b732 | 1760 | } |
6aa8b732 | 1761 | |
414de7ab SC |
1762 | /* Allocate/free page dirty bitmap as needed */ |
1763 | if (!(new.flags & KVM_MEM_LOG_DIRTY_PAGES)) | |
1764 | new.dirty_bitmap = NULL; | |
044c59c4 | 1765 | else if (!new.dirty_bitmap && !kvm->dirty_ring_size) { |
3c9bd400 | 1766 | r = kvm_alloc_dirty_bitmap(&new); |
71a4c30b SC |
1767 | if (r) |
1768 | return r; | |
3c9bd400 JZ |
1769 | |
1770 | if (kvm_dirty_log_manual_protect_and_init_set(kvm)) | |
1771 | bitmap_set(new.dirty_bitmap, 0, new.npages); | |
6aa8b732 AK |
1772 | } |
1773 | ||
cf47f50b SC |
1774 | r = kvm_set_memslot(kvm, mem, &old, &new, as_id, change); |
1775 | if (r) | |
1776 | goto out_bitmap; | |
82ce2c96 | 1777 | |
5c0b4f3d SC |
1778 | if (old.dirty_bitmap && !new.dirty_bitmap) |
1779 | kvm_destroy_dirty_bitmap(&old); | |
6aa8b732 AK |
1780 | return 0; |
1781 | ||
bd0e96fd SC |
1782 | out_bitmap: |
1783 | if (new.dirty_bitmap && !old.dirty_bitmap) | |
1784 | kvm_destroy_dirty_bitmap(&new); | |
6aa8b732 | 1785 | return r; |
210c7c4d | 1786 | } |
f78e0e2e SY |
1787 | EXPORT_SYMBOL_GPL(__kvm_set_memory_region); |
1788 | ||
1789 | int kvm_set_memory_region(struct kvm *kvm, | |
09170a49 | 1790 | const struct kvm_userspace_memory_region *mem) |
f78e0e2e SY |
1791 | { |
1792 | int r; | |
1793 | ||
79fac95e | 1794 | mutex_lock(&kvm->slots_lock); |
47ae31e2 | 1795 | r = __kvm_set_memory_region(kvm, mem); |
79fac95e | 1796 | mutex_unlock(&kvm->slots_lock); |
f78e0e2e SY |
1797 | return r; |
1798 | } | |
210c7c4d IE |
1799 | EXPORT_SYMBOL_GPL(kvm_set_memory_region); |
1800 | ||
7940876e SH |
1801 | static int kvm_vm_ioctl_set_memory_region(struct kvm *kvm, |
1802 | struct kvm_userspace_memory_region *mem) | |
210c7c4d | 1803 | { |
f481b069 | 1804 | if ((u16)mem->slot >= KVM_USER_MEM_SLOTS) |
e0d62c7f | 1805 | return -EINVAL; |
09170a49 | 1806 | |
47ae31e2 | 1807 | return kvm_set_memory_region(kvm, mem); |
6aa8b732 AK |
1808 | } |
1809 | ||
0dff0846 | 1810 | #ifndef CONFIG_KVM_GENERIC_DIRTYLOG_READ_PROTECT |
2a49f61d SC |
1811 | /** |
1812 | * kvm_get_dirty_log - get a snapshot of dirty pages | |
1813 | * @kvm: pointer to kvm instance | |
1814 | * @log: slot id and address to which we copy the log | |
1815 | * @is_dirty: set to '1' if any dirty pages were found | |
1816 | * @memslot: set to the associated memslot, always valid on success | |
1817 | */ | |
1818 | int kvm_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log, | |
1819 | int *is_dirty, struct kvm_memory_slot **memslot) | |
6aa8b732 | 1820 | { |
9f6b8029 | 1821 | struct kvm_memslots *slots; |
843574a3 | 1822 | int i, as_id, id; |
87bf6e7d | 1823 | unsigned long n; |
6aa8b732 AK |
1824 | unsigned long any = 0; |
1825 | ||
b2cc64c4 PX |
1826 | /* Dirty ring tracking is exclusive to dirty log tracking */ |
1827 | if (kvm->dirty_ring_size) | |
1828 | return -ENXIO; | |
1829 | ||
2a49f61d SC |
1830 | *memslot = NULL; |
1831 | *is_dirty = 0; | |
1832 | ||
f481b069 PB |
1833 | as_id = log->slot >> 16; |
1834 | id = (u16)log->slot; | |
1835 | if (as_id >= KVM_ADDRESS_SPACE_NUM || id >= KVM_USER_MEM_SLOTS) | |
843574a3 | 1836 | return -EINVAL; |
6aa8b732 | 1837 | |
f481b069 | 1838 | slots = __kvm_memslots(kvm, as_id); |
2a49f61d | 1839 | *memslot = id_to_memslot(slots, id); |
0577d1ab | 1840 | if (!(*memslot) || !(*memslot)->dirty_bitmap) |
843574a3 | 1841 | return -ENOENT; |
6aa8b732 | 1842 | |
2a49f61d SC |
1843 | kvm_arch_sync_dirty_log(kvm, *memslot); |
1844 | ||
1845 | n = kvm_dirty_bitmap_bytes(*memslot); | |
6aa8b732 | 1846 | |
cd1a4a98 | 1847 | for (i = 0; !any && i < n/sizeof(long); ++i) |
2a49f61d | 1848 | any = (*memslot)->dirty_bitmap[i]; |
6aa8b732 | 1849 | |
2a49f61d | 1850 | if (copy_to_user(log->dirty_bitmap, (*memslot)->dirty_bitmap, n)) |
843574a3 | 1851 | return -EFAULT; |
6aa8b732 | 1852 | |
5bb064dc ZX |
1853 | if (any) |
1854 | *is_dirty = 1; | |
843574a3 | 1855 | return 0; |
6aa8b732 | 1856 | } |
2ba9f0d8 | 1857 | EXPORT_SYMBOL_GPL(kvm_get_dirty_log); |
6aa8b732 | 1858 | |
0dff0846 | 1859 | #else /* CONFIG_KVM_GENERIC_DIRTYLOG_READ_PROTECT */ |
ba0513b5 | 1860 | /** |
b8b00220 | 1861 | * kvm_get_dirty_log_protect - get a snapshot of dirty pages |
2a31b9db | 1862 | * and reenable dirty page tracking for the corresponding pages. |
ba0513b5 MS |
1863 | * @kvm: pointer to kvm instance |
1864 | * @log: slot id and address to which we copy the log | |
ba0513b5 MS |
1865 | * |
1866 | * We need to keep it in mind that VCPU threads can write to the bitmap | |
1867 | * concurrently. So, to avoid losing track of dirty pages we keep the | |
1868 | * following order: | |
1869 | * | |
1870 | * 1. Take a snapshot of the bit and clear it if needed. | |
1871 | * 2. Write protect the corresponding page. | |
1872 | * 3. Copy the snapshot to the userspace. | |
1873 | * 4. Upon return caller flushes TLB's if needed. | |
1874 | * | |
1875 | * Between 2 and 4, the guest may write to the page using the remaining TLB | |
1876 | * entry. This is not a problem because the page is reported dirty using | |
1877 | * the snapshot taken before and step 4 ensures that writes done after | |
1878 | * exiting to userspace will be logged for the next call. | |
1879 | * | |
1880 | */ | |
0dff0846 | 1881 | static int kvm_get_dirty_log_protect(struct kvm *kvm, struct kvm_dirty_log *log) |
ba0513b5 | 1882 | { |
9f6b8029 | 1883 | struct kvm_memslots *slots; |
ba0513b5 | 1884 | struct kvm_memory_slot *memslot; |
58d6db34 | 1885 | int i, as_id, id; |
ba0513b5 MS |
1886 | unsigned long n; |
1887 | unsigned long *dirty_bitmap; | |
1888 | unsigned long *dirty_bitmap_buffer; | |
0dff0846 | 1889 | bool flush; |
ba0513b5 | 1890 | |
b2cc64c4 PX |
1891 | /* Dirty ring tracking is exclusive to dirty log tracking */ |
1892 | if (kvm->dirty_ring_size) | |
1893 | return -ENXIO; | |
1894 | ||
f481b069 PB |
1895 | as_id = log->slot >> 16; |
1896 | id = (u16)log->slot; | |
1897 | if (as_id >= KVM_ADDRESS_SPACE_NUM || id >= KVM_USER_MEM_SLOTS) | |
58d6db34 | 1898 | return -EINVAL; |
ba0513b5 | 1899 | |
f481b069 PB |
1900 | slots = __kvm_memslots(kvm, as_id); |
1901 | memslot = id_to_memslot(slots, id); | |
0577d1ab SC |
1902 | if (!memslot || !memslot->dirty_bitmap) |
1903 | return -ENOENT; | |
ba0513b5 MS |
1904 | |
1905 | dirty_bitmap = memslot->dirty_bitmap; | |
ba0513b5 | 1906 | |
0dff0846 SC |
1907 | kvm_arch_sync_dirty_log(kvm, memslot); |
1908 | ||
ba0513b5 | 1909 | n = kvm_dirty_bitmap_bytes(memslot); |
0dff0846 | 1910 | flush = false; |
2a31b9db PB |
1911 | if (kvm->manual_dirty_log_protect) { |
1912 | /* | |
1913 | * Unlike kvm_get_dirty_log, we always return false in *flush, | |
1914 | * because no flush is needed until KVM_CLEAR_DIRTY_LOG. There | |
1915 | * is some code duplication between this function and | |
1916 | * kvm_get_dirty_log, but hopefully all architecture | |
1917 | * transition to kvm_get_dirty_log_protect and kvm_get_dirty_log | |
1918 | * can be eliminated. | |
1919 | */ | |
1920 | dirty_bitmap_buffer = dirty_bitmap; | |
1921 | } else { | |
1922 | dirty_bitmap_buffer = kvm_second_dirty_bitmap(memslot); | |
1923 | memset(dirty_bitmap_buffer, 0, n); | |
ba0513b5 | 1924 | |
531810ca | 1925 | KVM_MMU_LOCK(kvm); |
2a31b9db PB |
1926 | for (i = 0; i < n / sizeof(long); i++) { |
1927 | unsigned long mask; | |
1928 | gfn_t offset; | |
ba0513b5 | 1929 | |
2a31b9db PB |
1930 | if (!dirty_bitmap[i]) |
1931 | continue; | |
1932 | ||
0dff0846 | 1933 | flush = true; |
2a31b9db PB |
1934 | mask = xchg(&dirty_bitmap[i], 0); |
1935 | dirty_bitmap_buffer[i] = mask; | |
1936 | ||
a67794ca LT |
1937 | offset = i * BITS_PER_LONG; |
1938 | kvm_arch_mmu_enable_log_dirty_pt_masked(kvm, memslot, | |
1939 | offset, mask); | |
2a31b9db | 1940 | } |
531810ca | 1941 | KVM_MMU_UNLOCK(kvm); |
2a31b9db PB |
1942 | } |
1943 | ||
0dff0846 SC |
1944 | if (flush) |
1945 | kvm_arch_flush_remote_tlbs_memslot(kvm, memslot); | |
1946 | ||
2a31b9db PB |
1947 | if (copy_to_user(log->dirty_bitmap, dirty_bitmap_buffer, n)) |
1948 | return -EFAULT; | |
1949 | return 0; | |
1950 | } | |
0dff0846 SC |
1951 | |
1952 | ||
1953 | /** | |
1954 | * kvm_vm_ioctl_get_dirty_log - get and clear the log of dirty pages in a slot | |
1955 | * @kvm: kvm instance | |
1956 | * @log: slot id and address to which we copy the log | |
1957 | * | |
1958 | * Steps 1-4 below provide general overview of dirty page logging. See | |
1959 | * kvm_get_dirty_log_protect() function description for additional details. | |
1960 | * | |
1961 | * We call kvm_get_dirty_log_protect() to handle steps 1-3, upon return we | |
1962 | * always flush the TLB (step 4) even if previous step failed and the dirty | |
1963 | * bitmap may be corrupt. Regardless of previous outcome the KVM logging API | |
1964 | * does not preclude user space subsequent dirty log read. Flushing TLB ensures | |
1965 | * writes will be marked dirty for next log read. | |
1966 | * | |
1967 | * 1. Take a snapshot of the bit and clear it if needed. | |
1968 | * 2. Write protect the corresponding page. | |
1969 | * 3. Copy the snapshot to the userspace. | |
1970 | * 4. Flush TLB's if needed. | |
1971 | */ | |
1972 | static int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, | |
1973 | struct kvm_dirty_log *log) | |
1974 | { | |
1975 | int r; | |
1976 | ||
1977 | mutex_lock(&kvm->slots_lock); | |
1978 | ||
1979 | r = kvm_get_dirty_log_protect(kvm, log); | |
1980 | ||
1981 | mutex_unlock(&kvm->slots_lock); | |
1982 | return r; | |
1983 | } | |
2a31b9db PB |
1984 | |
1985 | /** | |
1986 | * kvm_clear_dirty_log_protect - clear dirty bits in the bitmap | |
1987 | * and reenable dirty page tracking for the corresponding pages. | |
1988 | * @kvm: pointer to kvm instance | |
1989 | * @log: slot id and address from which to fetch the bitmap of dirty pages | |
1990 | */ | |
0dff0846 SC |
1991 | static int kvm_clear_dirty_log_protect(struct kvm *kvm, |
1992 | struct kvm_clear_dirty_log *log) | |
2a31b9db PB |
1993 | { |
1994 | struct kvm_memslots *slots; | |
1995 | struct kvm_memory_slot *memslot; | |
98938aa8 | 1996 | int as_id, id; |
2a31b9db | 1997 | gfn_t offset; |
98938aa8 | 1998 | unsigned long i, n; |
2a31b9db PB |
1999 | unsigned long *dirty_bitmap; |
2000 | unsigned long *dirty_bitmap_buffer; | |
0dff0846 | 2001 | bool flush; |
2a31b9db | 2002 | |
b2cc64c4 PX |
2003 | /* Dirty ring tracking is exclusive to dirty log tracking */ |
2004 | if (kvm->dirty_ring_size) | |
2005 | return -ENXIO; | |
2006 | ||
2a31b9db PB |
2007 | as_id = log->slot >> 16; |
2008 | id = (u16)log->slot; | |
2009 | if (as_id >= KVM_ADDRESS_SPACE_NUM || id >= KVM_USER_MEM_SLOTS) | |
2010 | return -EINVAL; | |
2011 | ||
76d58e0f | 2012 | if (log->first_page & 63) |
2a31b9db PB |
2013 | return -EINVAL; |
2014 | ||
2015 | slots = __kvm_memslots(kvm, as_id); | |
2016 | memslot = id_to_memslot(slots, id); | |
0577d1ab SC |
2017 | if (!memslot || !memslot->dirty_bitmap) |
2018 | return -ENOENT; | |
2a31b9db PB |
2019 | |
2020 | dirty_bitmap = memslot->dirty_bitmap; | |
2a31b9db | 2021 | |
4ddc9204 | 2022 | n = ALIGN(log->num_pages, BITS_PER_LONG) / 8; |
98938aa8 TB |
2023 | |
2024 | if (log->first_page > memslot->npages || | |
76d58e0f PB |
2025 | log->num_pages > memslot->npages - log->first_page || |
2026 | (log->num_pages < memslot->npages - log->first_page && (log->num_pages & 63))) | |
2027 | return -EINVAL; | |
98938aa8 | 2028 | |
0dff0846 SC |
2029 | kvm_arch_sync_dirty_log(kvm, memslot); |
2030 | ||
2031 | flush = false; | |
2a31b9db PB |
2032 | dirty_bitmap_buffer = kvm_second_dirty_bitmap(memslot); |
2033 | if (copy_from_user(dirty_bitmap_buffer, log->dirty_bitmap, n)) | |
2034 | return -EFAULT; | |
ba0513b5 | 2035 | |
531810ca | 2036 | KVM_MMU_LOCK(kvm); |
53eac7a8 PX |
2037 | for (offset = log->first_page, i = offset / BITS_PER_LONG, |
2038 | n = DIV_ROUND_UP(log->num_pages, BITS_PER_LONG); n--; | |
2a31b9db PB |
2039 | i++, offset += BITS_PER_LONG) { |
2040 | unsigned long mask = *dirty_bitmap_buffer++; | |
2041 | atomic_long_t *p = (atomic_long_t *) &dirty_bitmap[i]; | |
2042 | if (!mask) | |
ba0513b5 MS |
2043 | continue; |
2044 | ||
2a31b9db | 2045 | mask &= atomic_long_fetch_andnot(mask, p); |
ba0513b5 | 2046 | |
2a31b9db PB |
2047 | /* |
2048 | * mask contains the bits that really have been cleared. This | |
2049 | * never includes any bits beyond the length of the memslot (if | |
2050 | * the length is not aligned to 64 pages), therefore it is not | |
2051 | * a problem if userspace sets them in log->dirty_bitmap. | |
2052 | */ | |
58d2930f | 2053 | if (mask) { |
0dff0846 | 2054 | flush = true; |
58d2930f TY |
2055 | kvm_arch_mmu_enable_log_dirty_pt_masked(kvm, memslot, |
2056 | offset, mask); | |
2057 | } | |
ba0513b5 | 2058 | } |
531810ca | 2059 | KVM_MMU_UNLOCK(kvm); |
2a31b9db | 2060 | |
0dff0846 SC |
2061 | if (flush) |
2062 | kvm_arch_flush_remote_tlbs_memslot(kvm, memslot); | |
2063 | ||
58d6db34 | 2064 | return 0; |
ba0513b5 | 2065 | } |
0dff0846 SC |
2066 | |
2067 | static int kvm_vm_ioctl_clear_dirty_log(struct kvm *kvm, | |
2068 | struct kvm_clear_dirty_log *log) | |
2069 | { | |
2070 | int r; | |
2071 | ||
2072 | mutex_lock(&kvm->slots_lock); | |
2073 | ||
2074 | r = kvm_clear_dirty_log_protect(kvm, log); | |
2075 | ||
2076 | mutex_unlock(&kvm->slots_lock); | |
2077 | return r; | |
2078 | } | |
2079 | #endif /* CONFIG_KVM_GENERIC_DIRTYLOG_READ_PROTECT */ | |
ba0513b5 | 2080 | |
49c7754c GN |
2081 | struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn) |
2082 | { | |
2083 | return __gfn_to_memslot(kvm_memslots(kvm), gfn); | |
2084 | } | |
a1f4d395 | 2085 | EXPORT_SYMBOL_GPL(gfn_to_memslot); |
6aa8b732 | 2086 | |
8e73485c PB |
2087 | struct kvm_memory_slot *kvm_vcpu_gfn_to_memslot(struct kvm_vcpu *vcpu, gfn_t gfn) |
2088 | { | |
fe22ed82 DM |
2089 | struct kvm_memslots *slots = kvm_vcpu_memslots(vcpu); |
2090 | struct kvm_memory_slot *slot; | |
2091 | int slot_index; | |
2092 | ||
2093 | slot = try_get_memslot(slots, vcpu->last_used_slot, gfn); | |
2094 | if (slot) | |
2095 | return slot; | |
2096 | ||
2097 | /* | |
2098 | * Fall back to searching all memslots. We purposely use | |
2099 | * search_memslots() instead of __gfn_to_memslot() to avoid | |
2100 | * thrashing the VM-wide last_used_index in kvm_memslots. | |
2101 | */ | |
2102 | slot = search_memslots(slots, gfn, &slot_index); | |
2103 | if (slot) { | |
2104 | vcpu->last_used_slot = slot_index; | |
2105 | return slot; | |
2106 | } | |
2107 | ||
2108 | return NULL; | |
8e73485c | 2109 | } |
e72436bc | 2110 | EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_memslot); |
8e73485c | 2111 | |
33e94154 | 2112 | bool kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn) |
e0d62c7f | 2113 | { |
bf3e05bc | 2114 | struct kvm_memory_slot *memslot = gfn_to_memslot(kvm, gfn); |
e0d62c7f | 2115 | |
c36b7150 | 2116 | return kvm_is_visible_memslot(memslot); |
e0d62c7f IE |
2117 | } |
2118 | EXPORT_SYMBOL_GPL(kvm_is_visible_gfn); | |
2119 | ||
995decb6 VK |
2120 | bool kvm_vcpu_is_visible_gfn(struct kvm_vcpu *vcpu, gfn_t gfn) |
2121 | { | |
2122 | struct kvm_memory_slot *memslot = kvm_vcpu_gfn_to_memslot(vcpu, gfn); | |
2123 | ||
2124 | return kvm_is_visible_memslot(memslot); | |
2125 | } | |
2126 | EXPORT_SYMBOL_GPL(kvm_vcpu_is_visible_gfn); | |
2127 | ||
f9b84e19 | 2128 | unsigned long kvm_host_page_size(struct kvm_vcpu *vcpu, gfn_t gfn) |
8f0b1ab6 JR |
2129 | { |
2130 | struct vm_area_struct *vma; | |
2131 | unsigned long addr, size; | |
2132 | ||
2133 | size = PAGE_SIZE; | |
2134 | ||
42cde48b | 2135 | addr = kvm_vcpu_gfn_to_hva_prot(vcpu, gfn, NULL); |
8f0b1ab6 JR |
2136 | if (kvm_is_error_hva(addr)) |
2137 | return PAGE_SIZE; | |
2138 | ||
d8ed45c5 | 2139 | mmap_read_lock(current->mm); |
8f0b1ab6 JR |
2140 | vma = find_vma(current->mm, addr); |
2141 | if (!vma) | |
2142 | goto out; | |
2143 | ||
2144 | size = vma_kernel_pagesize(vma); | |
2145 | ||
2146 | out: | |
d8ed45c5 | 2147 | mmap_read_unlock(current->mm); |
8f0b1ab6 JR |
2148 | |
2149 | return size; | |
2150 | } | |
2151 | ||
4d8b81ab XG |
2152 | static bool memslot_is_readonly(struct kvm_memory_slot *slot) |
2153 | { | |
2154 | return slot->flags & KVM_MEM_READONLY; | |
2155 | } | |
2156 | ||
4d8b81ab XG |
2157 | static unsigned long __gfn_to_hva_many(struct kvm_memory_slot *slot, gfn_t gfn, |
2158 | gfn_t *nr_pages, bool write) | |
539cb660 | 2159 | { |
bc6678a3 | 2160 | if (!slot || slot->flags & KVM_MEMSLOT_INVALID) |
ca3a490c | 2161 | return KVM_HVA_ERR_BAD; |
48987781 | 2162 | |
4d8b81ab XG |
2163 | if (memslot_is_readonly(slot) && write) |
2164 | return KVM_HVA_ERR_RO_BAD; | |
48987781 XG |
2165 | |
2166 | if (nr_pages) | |
2167 | *nr_pages = slot->npages - (gfn - slot->base_gfn); | |
2168 | ||
4d8b81ab | 2169 | return __gfn_to_hva_memslot(slot, gfn); |
539cb660 | 2170 | } |
48987781 | 2171 | |
4d8b81ab XG |
2172 | static unsigned long gfn_to_hva_many(struct kvm_memory_slot *slot, gfn_t gfn, |
2173 | gfn_t *nr_pages) | |
2174 | { | |
2175 | return __gfn_to_hva_many(slot, gfn, nr_pages, true); | |
539cb660 | 2176 | } |
48987781 | 2177 | |
4d8b81ab | 2178 | unsigned long gfn_to_hva_memslot(struct kvm_memory_slot *slot, |
7940876e | 2179 | gfn_t gfn) |
4d8b81ab XG |
2180 | { |
2181 | return gfn_to_hva_many(slot, gfn, NULL); | |
2182 | } | |
2183 | EXPORT_SYMBOL_GPL(gfn_to_hva_memslot); | |
2184 | ||
48987781 XG |
2185 | unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn) |
2186 | { | |
49c7754c | 2187 | return gfn_to_hva_many(gfn_to_memslot(kvm, gfn), gfn, NULL); |
48987781 | 2188 | } |
0d150298 | 2189 | EXPORT_SYMBOL_GPL(gfn_to_hva); |
539cb660 | 2190 | |
8e73485c PB |
2191 | unsigned long kvm_vcpu_gfn_to_hva(struct kvm_vcpu *vcpu, gfn_t gfn) |
2192 | { | |
2193 | return gfn_to_hva_many(kvm_vcpu_gfn_to_memslot(vcpu, gfn), gfn, NULL); | |
2194 | } | |
2195 | EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_hva); | |
2196 | ||
86ab8cff | 2197 | /* |
970c0d4b WY |
2198 | * Return the hva of a @gfn and the R/W attribute if possible. |
2199 | * | |
2200 | * @slot: the kvm_memory_slot which contains @gfn | |
2201 | * @gfn: the gfn to be translated | |
2202 | * @writable: used to return the read/write attribute of the @slot if the hva | |
2203 | * is valid and @writable is not NULL | |
86ab8cff | 2204 | */ |
64d83126 CD |
2205 | unsigned long gfn_to_hva_memslot_prot(struct kvm_memory_slot *slot, |
2206 | gfn_t gfn, bool *writable) | |
86ab8cff | 2207 | { |
a2ac07fe GN |
2208 | unsigned long hva = __gfn_to_hva_many(slot, gfn, NULL, false); |
2209 | ||
2210 | if (!kvm_is_error_hva(hva) && writable) | |
ba6a3541 PB |
2211 | *writable = !memslot_is_readonly(slot); |
2212 | ||
a2ac07fe | 2213 | return hva; |
86ab8cff XG |
2214 | } |
2215 | ||
64d83126 CD |
2216 | unsigned long gfn_to_hva_prot(struct kvm *kvm, gfn_t gfn, bool *writable) |
2217 | { | |
2218 | struct kvm_memory_slot *slot = gfn_to_memslot(kvm, gfn); | |
2219 | ||
2220 | return gfn_to_hva_memslot_prot(slot, gfn, writable); | |
2221 | } | |
2222 | ||
8e73485c PB |
2223 | unsigned long kvm_vcpu_gfn_to_hva_prot(struct kvm_vcpu *vcpu, gfn_t gfn, bool *writable) |
2224 | { | |
2225 | struct kvm_memory_slot *slot = kvm_vcpu_gfn_to_memslot(vcpu, gfn); | |
2226 | ||
2227 | return gfn_to_hva_memslot_prot(slot, gfn, writable); | |
2228 | } | |
2229 | ||
fafc3dba HY |
2230 | static inline int check_user_page_hwpoison(unsigned long addr) |
2231 | { | |
0d731759 | 2232 | int rc, flags = FOLL_HWPOISON | FOLL_WRITE; |
fafc3dba | 2233 | |
0d731759 | 2234 | rc = get_user_pages(addr, 1, flags, NULL, NULL); |
fafc3dba HY |
2235 | return rc == -EHWPOISON; |
2236 | } | |
2237 | ||
2fc84311 | 2238 | /* |
b9b33da2 PB |
2239 | * The fast path to get the writable pfn which will be stored in @pfn, |
2240 | * true indicates success, otherwise false is returned. It's also the | |
311497e0 | 2241 | * only part that runs if we can in atomic context. |
2fc84311 | 2242 | */ |
b9b33da2 PB |
2243 | static bool hva_to_pfn_fast(unsigned long addr, bool write_fault, |
2244 | bool *writable, kvm_pfn_t *pfn) | |
954bbbc2 | 2245 | { |
8d4e1288 | 2246 | struct page *page[1]; |
954bbbc2 | 2247 | |
12ce13fe XG |
2248 | /* |
2249 | * Fast pin a writable pfn only if it is a write fault request | |
2250 | * or the caller allows to map a writable pfn for a read fault | |
2251 | * request. | |
2252 | */ | |
2253 | if (!(write_fault || writable)) | |
2254 | return false; | |
612819c3 | 2255 | |
dadbb612 | 2256 | if (get_user_page_fast_only(addr, FOLL_WRITE, page)) { |
2fc84311 | 2257 | *pfn = page_to_pfn(page[0]); |
612819c3 | 2258 | |
2fc84311 XG |
2259 | if (writable) |
2260 | *writable = true; | |
2261 | return true; | |
2262 | } | |
af585b92 | 2263 | |
2fc84311 XG |
2264 | return false; |
2265 | } | |
612819c3 | 2266 | |
2fc84311 XG |
2267 | /* |
2268 | * The slow path to get the pfn of the specified host virtual address, | |
2269 | * 1 indicates success, -errno is returned if error is detected. | |
2270 | */ | |
2271 | static int hva_to_pfn_slow(unsigned long addr, bool *async, bool write_fault, | |
ba049e93 | 2272 | bool *writable, kvm_pfn_t *pfn) |
2fc84311 | 2273 | { |
ce53053c AV |
2274 | unsigned int flags = FOLL_HWPOISON; |
2275 | struct page *page; | |
2fc84311 | 2276 | int npages = 0; |
612819c3 | 2277 | |
2fc84311 XG |
2278 | might_sleep(); |
2279 | ||
2280 | if (writable) | |
2281 | *writable = write_fault; | |
2282 | ||
ce53053c AV |
2283 | if (write_fault) |
2284 | flags |= FOLL_WRITE; | |
2285 | if (async) | |
2286 | flags |= FOLL_NOWAIT; | |
d4944b0e | 2287 | |
ce53053c | 2288 | npages = get_user_pages_unlocked(addr, 1, &page, flags); |
2fc84311 XG |
2289 | if (npages != 1) |
2290 | return npages; | |
2291 | ||
2292 | /* map read fault as writable if possible */ | |
12ce13fe | 2293 | if (unlikely(!write_fault) && writable) { |
ce53053c | 2294 | struct page *wpage; |
2fc84311 | 2295 | |
dadbb612 | 2296 | if (get_user_page_fast_only(addr, FOLL_WRITE, &wpage)) { |
2fc84311 | 2297 | *writable = true; |
ce53053c AV |
2298 | put_page(page); |
2299 | page = wpage; | |
612819c3 | 2300 | } |
887c08ac | 2301 | } |
ce53053c | 2302 | *pfn = page_to_pfn(page); |
2fc84311 XG |
2303 | return npages; |
2304 | } | |
539cb660 | 2305 | |
4d8b81ab XG |
2306 | static bool vma_is_valid(struct vm_area_struct *vma, bool write_fault) |
2307 | { | |
2308 | if (unlikely(!(vma->vm_flags & VM_READ))) | |
2309 | return false; | |
2e2e3738 | 2310 | |
4d8b81ab XG |
2311 | if (write_fault && (unlikely(!(vma->vm_flags & VM_WRITE)))) |
2312 | return false; | |
887c08ac | 2313 | |
4d8b81ab XG |
2314 | return true; |
2315 | } | |
bf998156 | 2316 | |
f8be156b NP |
2317 | static int kvm_try_get_pfn(kvm_pfn_t pfn) |
2318 | { | |
2319 | if (kvm_is_reserved_pfn(pfn)) | |
2320 | return 1; | |
2321 | return get_page_unless_zero(pfn_to_page(pfn)); | |
2322 | } | |
2323 | ||
92176a8e PB |
2324 | static int hva_to_pfn_remapped(struct vm_area_struct *vma, |
2325 | unsigned long addr, bool *async, | |
a340b3e2 KA |
2326 | bool write_fault, bool *writable, |
2327 | kvm_pfn_t *p_pfn) | |
92176a8e | 2328 | { |
a9545779 | 2329 | kvm_pfn_t pfn; |
bd2fae8d PB |
2330 | pte_t *ptep; |
2331 | spinlock_t *ptl; | |
add6a0cd PB |
2332 | int r; |
2333 | ||
9fd6dad1 | 2334 | r = follow_pte(vma->vm_mm, addr, &ptep, &ptl); |
add6a0cd PB |
2335 | if (r) { |
2336 | /* | |
2337 | * get_user_pages fails for VM_IO and VM_PFNMAP vmas and does | |
2338 | * not call the fault handler, so do it here. | |
2339 | */ | |
2340 | bool unlocked = false; | |
64019a2e | 2341 | r = fixup_user_fault(current->mm, addr, |
add6a0cd PB |
2342 | (write_fault ? FAULT_FLAG_WRITE : 0), |
2343 | &unlocked); | |
a8387d0b PB |
2344 | if (unlocked) |
2345 | return -EAGAIN; | |
add6a0cd PB |
2346 | if (r) |
2347 | return r; | |
2348 | ||
9fd6dad1 | 2349 | r = follow_pte(vma->vm_mm, addr, &ptep, &ptl); |
add6a0cd PB |
2350 | if (r) |
2351 | return r; | |
bd2fae8d | 2352 | } |
add6a0cd | 2353 | |
bd2fae8d PB |
2354 | if (write_fault && !pte_write(*ptep)) { |
2355 | pfn = KVM_PFN_ERR_RO_FAULT; | |
2356 | goto out; | |
add6a0cd PB |
2357 | } |
2358 | ||
a340b3e2 | 2359 | if (writable) |
bd2fae8d PB |
2360 | *writable = pte_write(*ptep); |
2361 | pfn = pte_pfn(*ptep); | |
add6a0cd PB |
2362 | |
2363 | /* | |
2364 | * Get a reference here because callers of *hva_to_pfn* and | |
2365 | * *gfn_to_pfn* ultimately call kvm_release_pfn_clean on the | |
2366 | * returned pfn. This is only needed if the VMA has VM_MIXEDMAP | |
36c3ce6c | 2367 | * set, but the kvm_try_get_pfn/kvm_release_pfn_clean pair will |
add6a0cd PB |
2368 | * simply do nothing for reserved pfns. |
2369 | * | |
2370 | * Whoever called remap_pfn_range is also going to call e.g. | |
2371 | * unmap_mapping_range before the underlying pages are freed, | |
2372 | * causing a call to our MMU notifier. | |
f8be156b NP |
2373 | * |
2374 | * Certain IO or PFNMAP mappings can be backed with valid | |
2375 | * struct pages, but be allocated without refcounting e.g., | |
2376 | * tail pages of non-compound higher order allocations, which | |
2377 | * would then underflow the refcount when the caller does the | |
2378 | * required put_page. Don't allow those pages here. | |
add6a0cd | 2379 | */ |
f8be156b NP |
2380 | if (!kvm_try_get_pfn(pfn)) |
2381 | r = -EFAULT; | |
add6a0cd | 2382 | |
bd2fae8d PB |
2383 | out: |
2384 | pte_unmap_unlock(ptep, ptl); | |
add6a0cd | 2385 | *p_pfn = pfn; |
f8be156b NP |
2386 | |
2387 | return r; | |
92176a8e PB |
2388 | } |
2389 | ||
12ce13fe XG |
2390 | /* |
2391 | * Pin guest page in memory and return its pfn. | |
2392 | * @addr: host virtual address which maps memory to the guest | |
2393 | * @atomic: whether this function can sleep | |
2394 | * @async: whether this function need to wait IO complete if the | |
2395 | * host page is not in the memory | |
2396 | * @write_fault: whether we should get a writable host page | |
2397 | * @writable: whether it allows to map a writable host page for !@write_fault | |
2398 | * | |
2399 | * The function will map a writable host page for these two cases: | |
2400 | * 1): @write_fault = true | |
2401 | * 2): @write_fault = false && @writable, @writable will tell the caller | |
2402 | * whether the mapping is writable. | |
2403 | */ | |
ba049e93 | 2404 | static kvm_pfn_t hva_to_pfn(unsigned long addr, bool atomic, bool *async, |
2fc84311 XG |
2405 | bool write_fault, bool *writable) |
2406 | { | |
2407 | struct vm_area_struct *vma; | |
ba049e93 | 2408 | kvm_pfn_t pfn = 0; |
92176a8e | 2409 | int npages, r; |
2e2e3738 | 2410 | |
2fc84311 XG |
2411 | /* we can do it either atomically or asynchronously, not both */ |
2412 | BUG_ON(atomic && async); | |
8d4e1288 | 2413 | |
b9b33da2 | 2414 | if (hva_to_pfn_fast(addr, write_fault, writable, &pfn)) |
2fc84311 XG |
2415 | return pfn; |
2416 | ||
2417 | if (atomic) | |
2418 | return KVM_PFN_ERR_FAULT; | |
2419 | ||
2420 | npages = hva_to_pfn_slow(addr, async, write_fault, writable, &pfn); | |
2421 | if (npages == 1) | |
2422 | return pfn; | |
8d4e1288 | 2423 | |
d8ed45c5 | 2424 | mmap_read_lock(current->mm); |
2fc84311 XG |
2425 | if (npages == -EHWPOISON || |
2426 | (!async && check_user_page_hwpoison(addr))) { | |
2427 | pfn = KVM_PFN_ERR_HWPOISON; | |
2428 | goto exit; | |
2429 | } | |
2430 | ||
a8387d0b | 2431 | retry: |
fc98c03b | 2432 | vma = vma_lookup(current->mm, addr); |
2fc84311 XG |
2433 | |
2434 | if (vma == NULL) | |
2435 | pfn = KVM_PFN_ERR_FAULT; | |
92176a8e | 2436 | else if (vma->vm_flags & (VM_IO | VM_PFNMAP)) { |
a340b3e2 | 2437 | r = hva_to_pfn_remapped(vma, addr, async, write_fault, writable, &pfn); |
a8387d0b PB |
2438 | if (r == -EAGAIN) |
2439 | goto retry; | |
92176a8e PB |
2440 | if (r < 0) |
2441 | pfn = KVM_PFN_ERR_FAULT; | |
2fc84311 | 2442 | } else { |
4d8b81ab | 2443 | if (async && vma_is_valid(vma, write_fault)) |
2fc84311 XG |
2444 | *async = true; |
2445 | pfn = KVM_PFN_ERR_FAULT; | |
2446 | } | |
2447 | exit: | |
d8ed45c5 | 2448 | mmap_read_unlock(current->mm); |
2e2e3738 | 2449 | return pfn; |
35149e21 AL |
2450 | } |
2451 | ||
ba049e93 DW |
2452 | kvm_pfn_t __gfn_to_pfn_memslot(struct kvm_memory_slot *slot, gfn_t gfn, |
2453 | bool atomic, bool *async, bool write_fault, | |
4a42d848 | 2454 | bool *writable, hva_t *hva) |
887c08ac | 2455 | { |
4d8b81ab XG |
2456 | unsigned long addr = __gfn_to_hva_many(slot, gfn, NULL, write_fault); |
2457 | ||
4a42d848 DS |
2458 | if (hva) |
2459 | *hva = addr; | |
2460 | ||
b2740d35 PB |
2461 | if (addr == KVM_HVA_ERR_RO_BAD) { |
2462 | if (writable) | |
2463 | *writable = false; | |
4d8b81ab | 2464 | return KVM_PFN_ERR_RO_FAULT; |
b2740d35 | 2465 | } |
4d8b81ab | 2466 | |
b2740d35 PB |
2467 | if (kvm_is_error_hva(addr)) { |
2468 | if (writable) | |
2469 | *writable = false; | |
81c52c56 | 2470 | return KVM_PFN_NOSLOT; |
b2740d35 | 2471 | } |
4d8b81ab XG |
2472 | |
2473 | /* Do not map writable pfn in the readonly memslot. */ | |
2474 | if (writable && memslot_is_readonly(slot)) { | |
2475 | *writable = false; | |
2476 | writable = NULL; | |
2477 | } | |
2478 | ||
2479 | return hva_to_pfn(addr, atomic, async, write_fault, | |
2480 | writable); | |
887c08ac | 2481 | } |
3520469d | 2482 | EXPORT_SYMBOL_GPL(__gfn_to_pfn_memslot); |
887c08ac | 2483 | |
ba049e93 | 2484 | kvm_pfn_t gfn_to_pfn_prot(struct kvm *kvm, gfn_t gfn, bool write_fault, |
612819c3 MT |
2485 | bool *writable) |
2486 | { | |
e37afc6e | 2487 | return __gfn_to_pfn_memslot(gfn_to_memslot(kvm, gfn), gfn, false, NULL, |
4a42d848 | 2488 | write_fault, writable, NULL); |
612819c3 MT |
2489 | } |
2490 | EXPORT_SYMBOL_GPL(gfn_to_pfn_prot); | |
2491 | ||
ba049e93 | 2492 | kvm_pfn_t gfn_to_pfn_memslot(struct kvm_memory_slot *slot, gfn_t gfn) |
506f0d6f | 2493 | { |
4a42d848 | 2494 | return __gfn_to_pfn_memslot(slot, gfn, false, NULL, true, NULL, NULL); |
506f0d6f | 2495 | } |
e37afc6e | 2496 | EXPORT_SYMBOL_GPL(gfn_to_pfn_memslot); |
506f0d6f | 2497 | |
ba049e93 | 2498 | kvm_pfn_t gfn_to_pfn_memslot_atomic(struct kvm_memory_slot *slot, gfn_t gfn) |
506f0d6f | 2499 | { |
4a42d848 | 2500 | return __gfn_to_pfn_memslot(slot, gfn, true, NULL, true, NULL, NULL); |
506f0d6f | 2501 | } |
037d92dc | 2502 | EXPORT_SYMBOL_GPL(gfn_to_pfn_memslot_atomic); |
506f0d6f | 2503 | |
ba049e93 | 2504 | kvm_pfn_t kvm_vcpu_gfn_to_pfn_atomic(struct kvm_vcpu *vcpu, gfn_t gfn) |
8e73485c PB |
2505 | { |
2506 | return gfn_to_pfn_memslot_atomic(kvm_vcpu_gfn_to_memslot(vcpu, gfn), gfn); | |
2507 | } | |
2508 | EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_pfn_atomic); | |
2509 | ||
ba049e93 | 2510 | kvm_pfn_t gfn_to_pfn(struct kvm *kvm, gfn_t gfn) |
e37afc6e PB |
2511 | { |
2512 | return gfn_to_pfn_memslot(gfn_to_memslot(kvm, gfn), gfn); | |
2513 | } | |
2514 | EXPORT_SYMBOL_GPL(gfn_to_pfn); | |
2515 | ||
ba049e93 | 2516 | kvm_pfn_t kvm_vcpu_gfn_to_pfn(struct kvm_vcpu *vcpu, gfn_t gfn) |
8e73485c PB |
2517 | { |
2518 | return gfn_to_pfn_memslot(kvm_vcpu_gfn_to_memslot(vcpu, gfn), gfn); | |
2519 | } | |
2520 | EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_pfn); | |
2521 | ||
d9ef13c2 PB |
2522 | int gfn_to_page_many_atomic(struct kvm_memory_slot *slot, gfn_t gfn, |
2523 | struct page **pages, int nr_pages) | |
48987781 XG |
2524 | { |
2525 | unsigned long addr; | |
076b925d | 2526 | gfn_t entry = 0; |
48987781 | 2527 | |
d9ef13c2 | 2528 | addr = gfn_to_hva_many(slot, gfn, &entry); |
48987781 XG |
2529 | if (kvm_is_error_hva(addr)) |
2530 | return -1; | |
2531 | ||
2532 | if (entry < nr_pages) | |
2533 | return 0; | |
2534 | ||
dadbb612 | 2535 | return get_user_pages_fast_only(addr, nr_pages, FOLL_WRITE, pages); |
48987781 XG |
2536 | } |
2537 | EXPORT_SYMBOL_GPL(gfn_to_page_many_atomic); | |
2538 | ||
ba049e93 | 2539 | static struct page *kvm_pfn_to_page(kvm_pfn_t pfn) |
a2766325 | 2540 | { |
81c52c56 | 2541 | if (is_error_noslot_pfn(pfn)) |
cb9aaa30 | 2542 | return KVM_ERR_PTR_BAD_PAGE; |
a2766325 | 2543 | |
bf4bea8e | 2544 | if (kvm_is_reserved_pfn(pfn)) { |
cb9aaa30 | 2545 | WARN_ON(1); |
6cede2e6 | 2546 | return KVM_ERR_PTR_BAD_PAGE; |
cb9aaa30 | 2547 | } |
a2766325 XG |
2548 | |
2549 | return pfn_to_page(pfn); | |
2550 | } | |
2551 | ||
35149e21 AL |
2552 | struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn) |
2553 | { | |
ba049e93 | 2554 | kvm_pfn_t pfn; |
2e2e3738 AL |
2555 | |
2556 | pfn = gfn_to_pfn(kvm, gfn); | |
2e2e3738 | 2557 | |
a2766325 | 2558 | return kvm_pfn_to_page(pfn); |
954bbbc2 AK |
2559 | } |
2560 | EXPORT_SYMBOL_GPL(gfn_to_page); | |
2561 | ||
91724814 BO |
2562 | void kvm_release_pfn(kvm_pfn_t pfn, bool dirty, struct gfn_to_pfn_cache *cache) |
2563 | { | |
2564 | if (pfn == 0) | |
2565 | return; | |
2566 | ||
2567 | if (cache) | |
2568 | cache->pfn = cache->gfn = 0; | |
2569 | ||
2570 | if (dirty) | |
2571 | kvm_release_pfn_dirty(pfn); | |
2572 | else | |
2573 | kvm_release_pfn_clean(pfn); | |
2574 | } | |
2575 | ||
2576 | static void kvm_cache_gfn_to_pfn(struct kvm_memory_slot *slot, gfn_t gfn, | |
2577 | struct gfn_to_pfn_cache *cache, u64 gen) | |
2578 | { | |
2579 | kvm_release_pfn(cache->pfn, cache->dirty, cache); | |
2580 | ||
2581 | cache->pfn = gfn_to_pfn_memslot(slot, gfn); | |
2582 | cache->gfn = gfn; | |
2583 | cache->dirty = false; | |
2584 | cache->generation = gen; | |
2585 | } | |
2586 | ||
1eff70a9 | 2587 | static int __kvm_map_gfn(struct kvm_memslots *slots, gfn_t gfn, |
91724814 BO |
2588 | struct kvm_host_map *map, |
2589 | struct gfn_to_pfn_cache *cache, | |
2590 | bool atomic) | |
e45adf66 KA |
2591 | { |
2592 | kvm_pfn_t pfn; | |
2593 | void *hva = NULL; | |
2594 | struct page *page = KVM_UNMAPPED_PAGE; | |
1eff70a9 | 2595 | struct kvm_memory_slot *slot = __gfn_to_memslot(slots, gfn); |
91724814 | 2596 | u64 gen = slots->generation; |
e45adf66 KA |
2597 | |
2598 | if (!map) | |
2599 | return -EINVAL; | |
2600 | ||
91724814 BO |
2601 | if (cache) { |
2602 | if (!cache->pfn || cache->gfn != gfn || | |
2603 | cache->generation != gen) { | |
2604 | if (atomic) | |
2605 | return -EAGAIN; | |
2606 | kvm_cache_gfn_to_pfn(slot, gfn, cache, gen); | |
2607 | } | |
2608 | pfn = cache->pfn; | |
2609 | } else { | |
2610 | if (atomic) | |
2611 | return -EAGAIN; | |
2612 | pfn = gfn_to_pfn_memslot(slot, gfn); | |
2613 | } | |
e45adf66 KA |
2614 | if (is_error_noslot_pfn(pfn)) |
2615 | return -EINVAL; | |
2616 | ||
2617 | if (pfn_valid(pfn)) { | |
2618 | page = pfn_to_page(pfn); | |
91724814 BO |
2619 | if (atomic) |
2620 | hva = kmap_atomic(page); | |
2621 | else | |
2622 | hva = kmap(page); | |
d30b214d | 2623 | #ifdef CONFIG_HAS_IOMEM |
91724814 | 2624 | } else if (!atomic) { |
e45adf66 | 2625 | hva = memremap(pfn_to_hpa(pfn), PAGE_SIZE, MEMREMAP_WB); |
91724814 BO |
2626 | } else { |
2627 | return -EINVAL; | |
d30b214d | 2628 | #endif |
e45adf66 KA |
2629 | } |
2630 | ||
2631 | if (!hva) | |
2632 | return -EFAULT; | |
2633 | ||
2634 | map->page = page; | |
2635 | map->hva = hva; | |
2636 | map->pfn = pfn; | |
2637 | map->gfn = gfn; | |
2638 | ||
2639 | return 0; | |
2640 | } | |
2641 | ||
91724814 BO |
2642 | int kvm_map_gfn(struct kvm_vcpu *vcpu, gfn_t gfn, struct kvm_host_map *map, |
2643 | struct gfn_to_pfn_cache *cache, bool atomic) | |
1eff70a9 | 2644 | { |
91724814 BO |
2645 | return __kvm_map_gfn(kvm_memslots(vcpu->kvm), gfn, map, |
2646 | cache, atomic); | |
1eff70a9 BO |
2647 | } |
2648 | EXPORT_SYMBOL_GPL(kvm_map_gfn); | |
2649 | ||
e45adf66 KA |
2650 | int kvm_vcpu_map(struct kvm_vcpu *vcpu, gfn_t gfn, struct kvm_host_map *map) |
2651 | { | |
91724814 BO |
2652 | return __kvm_map_gfn(kvm_vcpu_memslots(vcpu), gfn, map, |
2653 | NULL, false); | |
e45adf66 KA |
2654 | } |
2655 | EXPORT_SYMBOL_GPL(kvm_vcpu_map); | |
2656 | ||
28bd726a PX |
2657 | static void __kvm_unmap_gfn(struct kvm *kvm, |
2658 | struct kvm_memory_slot *memslot, | |
91724814 BO |
2659 | struct kvm_host_map *map, |
2660 | struct gfn_to_pfn_cache *cache, | |
2661 | bool dirty, bool atomic) | |
e45adf66 KA |
2662 | { |
2663 | if (!map) | |
2664 | return; | |
2665 | ||
2666 | if (!map->hva) | |
2667 | return; | |
2668 | ||
91724814 BO |
2669 | if (map->page != KVM_UNMAPPED_PAGE) { |
2670 | if (atomic) | |
2671 | kunmap_atomic(map->hva); | |
2672 | else | |
2673 | kunmap(map->page); | |
2674 | } | |
eb1f2f38 | 2675 | #ifdef CONFIG_HAS_IOMEM |
91724814 | 2676 | else if (!atomic) |
e45adf66 | 2677 | memunmap(map->hva); |
91724814 BO |
2678 | else |
2679 | WARN_ONCE(1, "Unexpected unmapping in atomic context"); | |
eb1f2f38 | 2680 | #endif |
e45adf66 | 2681 | |
91724814 | 2682 | if (dirty) |
28bd726a | 2683 | mark_page_dirty_in_slot(kvm, memslot, map->gfn); |
91724814 BO |
2684 | |
2685 | if (cache) | |
2686 | cache->dirty |= dirty; | |
2687 | else | |
2688 | kvm_release_pfn(map->pfn, dirty, NULL); | |
e45adf66 KA |
2689 | |
2690 | map->hva = NULL; | |
2691 | map->page = NULL; | |
2692 | } | |
1eff70a9 | 2693 | |
91724814 BO |
2694 | int kvm_unmap_gfn(struct kvm_vcpu *vcpu, struct kvm_host_map *map, |
2695 | struct gfn_to_pfn_cache *cache, bool dirty, bool atomic) | |
1eff70a9 | 2696 | { |
28bd726a | 2697 | __kvm_unmap_gfn(vcpu->kvm, gfn_to_memslot(vcpu->kvm, map->gfn), map, |
91724814 | 2698 | cache, dirty, atomic); |
1eff70a9 BO |
2699 | return 0; |
2700 | } | |
2701 | EXPORT_SYMBOL_GPL(kvm_unmap_gfn); | |
2702 | ||
2703 | void kvm_vcpu_unmap(struct kvm_vcpu *vcpu, struct kvm_host_map *map, bool dirty) | |
2704 | { | |
28bd726a PX |
2705 | __kvm_unmap_gfn(vcpu->kvm, kvm_vcpu_gfn_to_memslot(vcpu, map->gfn), |
2706 | map, NULL, dirty, false); | |
1eff70a9 | 2707 | } |
e45adf66 KA |
2708 | EXPORT_SYMBOL_GPL(kvm_vcpu_unmap); |
2709 | ||
8e73485c PB |
2710 | struct page *kvm_vcpu_gfn_to_page(struct kvm_vcpu *vcpu, gfn_t gfn) |
2711 | { | |
ba049e93 | 2712 | kvm_pfn_t pfn; |
8e73485c PB |
2713 | |
2714 | pfn = kvm_vcpu_gfn_to_pfn(vcpu, gfn); | |
2715 | ||
2716 | return kvm_pfn_to_page(pfn); | |
2717 | } | |
2718 | EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_page); | |
2719 | ||
b4231d61 IE |
2720 | void kvm_release_page_clean(struct page *page) |
2721 | { | |
32cad84f XG |
2722 | WARN_ON(is_error_page(page)); |
2723 | ||
35149e21 | 2724 | kvm_release_pfn_clean(page_to_pfn(page)); |
b4231d61 IE |
2725 | } |
2726 | EXPORT_SYMBOL_GPL(kvm_release_page_clean); | |
2727 | ||
ba049e93 | 2728 | void kvm_release_pfn_clean(kvm_pfn_t pfn) |
35149e21 | 2729 | { |
bf4bea8e | 2730 | if (!is_error_noslot_pfn(pfn) && !kvm_is_reserved_pfn(pfn)) |
2e2e3738 | 2731 | put_page(pfn_to_page(pfn)); |
35149e21 AL |
2732 | } |
2733 | EXPORT_SYMBOL_GPL(kvm_release_pfn_clean); | |
2734 | ||
b4231d61 | 2735 | void kvm_release_page_dirty(struct page *page) |
8a7ae055 | 2736 | { |
a2766325 XG |
2737 | WARN_ON(is_error_page(page)); |
2738 | ||
35149e21 AL |
2739 | kvm_release_pfn_dirty(page_to_pfn(page)); |
2740 | } | |
2741 | EXPORT_SYMBOL_GPL(kvm_release_page_dirty); | |
2742 | ||
f7a6509f | 2743 | void kvm_release_pfn_dirty(kvm_pfn_t pfn) |
35149e21 AL |
2744 | { |
2745 | kvm_set_pfn_dirty(pfn); | |
2746 | kvm_release_pfn_clean(pfn); | |
2747 | } | |
f7a6509f | 2748 | EXPORT_SYMBOL_GPL(kvm_release_pfn_dirty); |
35149e21 | 2749 | |
ba049e93 | 2750 | void kvm_set_pfn_dirty(kvm_pfn_t pfn) |
35149e21 | 2751 | { |
d29c03a5 ML |
2752 | if (!kvm_is_reserved_pfn(pfn) && !kvm_is_zone_device_pfn(pfn)) |
2753 | SetPageDirty(pfn_to_page(pfn)); | |
8a7ae055 | 2754 | } |
35149e21 AL |
2755 | EXPORT_SYMBOL_GPL(kvm_set_pfn_dirty); |
2756 | ||
ba049e93 | 2757 | void kvm_set_pfn_accessed(kvm_pfn_t pfn) |
35149e21 | 2758 | { |
a78986aa | 2759 | if (!kvm_is_reserved_pfn(pfn) && !kvm_is_zone_device_pfn(pfn)) |
2e2e3738 | 2760 | mark_page_accessed(pfn_to_page(pfn)); |
35149e21 AL |
2761 | } |
2762 | EXPORT_SYMBOL_GPL(kvm_set_pfn_accessed); | |
2763 | ||
195aefde IE |
2764 | static int next_segment(unsigned long len, int offset) |
2765 | { | |
2766 | if (len > PAGE_SIZE - offset) | |
2767 | return PAGE_SIZE - offset; | |
2768 | else | |
2769 | return len; | |
2770 | } | |
2771 | ||
8e73485c PB |
2772 | static int __kvm_read_guest_page(struct kvm_memory_slot *slot, gfn_t gfn, |
2773 | void *data, int offset, int len) | |
195aefde | 2774 | { |
e0506bcb IE |
2775 | int r; |
2776 | unsigned long addr; | |
195aefde | 2777 | |
8e73485c | 2778 | addr = gfn_to_hva_memslot_prot(slot, gfn, NULL); |
e0506bcb IE |
2779 | if (kvm_is_error_hva(addr)) |
2780 | return -EFAULT; | |
3180a7fc | 2781 | r = __copy_from_user(data, (void __user *)addr + offset, len); |
e0506bcb | 2782 | if (r) |
195aefde | 2783 | return -EFAULT; |
195aefde IE |
2784 | return 0; |
2785 | } | |
8e73485c PB |
2786 | |
2787 | int kvm_read_guest_page(struct kvm *kvm, gfn_t gfn, void *data, int offset, | |
2788 | int len) | |
2789 | { | |
2790 | struct kvm_memory_slot *slot = gfn_to_memslot(kvm, gfn); | |
2791 | ||
2792 | return __kvm_read_guest_page(slot, gfn, data, offset, len); | |
2793 | } | |
195aefde IE |
2794 | EXPORT_SYMBOL_GPL(kvm_read_guest_page); |
2795 | ||
8e73485c PB |
2796 | int kvm_vcpu_read_guest_page(struct kvm_vcpu *vcpu, gfn_t gfn, void *data, |
2797 | int offset, int len) | |
2798 | { | |
2799 | struct kvm_memory_slot *slot = kvm_vcpu_gfn_to_memslot(vcpu, gfn); | |
2800 | ||
2801 | return __kvm_read_guest_page(slot, gfn, data, offset, len); | |
2802 | } | |
2803 | EXPORT_SYMBOL_GPL(kvm_vcpu_read_guest_page); | |
2804 | ||
195aefde IE |
2805 | int kvm_read_guest(struct kvm *kvm, gpa_t gpa, void *data, unsigned long len) |
2806 | { | |
2807 | gfn_t gfn = gpa >> PAGE_SHIFT; | |
2808 | int seg; | |
2809 | int offset = offset_in_page(gpa); | |
2810 | int ret; | |
2811 | ||
2812 | while ((seg = next_segment(len, offset)) != 0) { | |
2813 | ret = kvm_read_guest_page(kvm, gfn, data, offset, seg); | |
2814 | if (ret < 0) | |
2815 | return ret; | |
2816 | offset = 0; | |
2817 | len -= seg; | |
2818 | data += seg; | |
2819 | ++gfn; | |
2820 | } | |
2821 | return 0; | |
2822 | } | |
2823 | EXPORT_SYMBOL_GPL(kvm_read_guest); | |
2824 | ||
8e73485c | 2825 | int kvm_vcpu_read_guest(struct kvm_vcpu *vcpu, gpa_t gpa, void *data, unsigned long len) |
7ec54588 | 2826 | { |
7ec54588 | 2827 | gfn_t gfn = gpa >> PAGE_SHIFT; |
8e73485c | 2828 | int seg; |
7ec54588 | 2829 | int offset = offset_in_page(gpa); |
8e73485c PB |
2830 | int ret; |
2831 | ||
2832 | while ((seg = next_segment(len, offset)) != 0) { | |
2833 | ret = kvm_vcpu_read_guest_page(vcpu, gfn, data, offset, seg); | |
2834 | if (ret < 0) | |
2835 | return ret; | |
2836 | offset = 0; | |
2837 | len -= seg; | |
2838 | data += seg; | |
2839 | ++gfn; | |
2840 | } | |
2841 | return 0; | |
2842 | } | |
2843 | EXPORT_SYMBOL_GPL(kvm_vcpu_read_guest); | |
7ec54588 | 2844 | |
8e73485c PB |
2845 | static int __kvm_read_guest_atomic(struct kvm_memory_slot *slot, gfn_t gfn, |
2846 | void *data, int offset, unsigned long len) | |
2847 | { | |
2848 | int r; | |
2849 | unsigned long addr; | |
2850 | ||
2851 | addr = gfn_to_hva_memslot_prot(slot, gfn, NULL); | |
7ec54588 MT |
2852 | if (kvm_is_error_hva(addr)) |
2853 | return -EFAULT; | |
0aac03f0 | 2854 | pagefault_disable(); |
3180a7fc | 2855 | r = __copy_from_user_inatomic(data, (void __user *)addr + offset, len); |
0aac03f0 | 2856 | pagefault_enable(); |
7ec54588 MT |
2857 | if (r) |
2858 | return -EFAULT; | |
2859 | return 0; | |
2860 | } | |
7ec54588 | 2861 | |
8e73485c PB |
2862 | int kvm_vcpu_read_guest_atomic(struct kvm_vcpu *vcpu, gpa_t gpa, |
2863 | void *data, unsigned long len) | |
2864 | { | |
2865 | gfn_t gfn = gpa >> PAGE_SHIFT; | |
2866 | struct kvm_memory_slot *slot = kvm_vcpu_gfn_to_memslot(vcpu, gfn); | |
2867 | int offset = offset_in_page(gpa); | |
2868 | ||
2869 | return __kvm_read_guest_atomic(slot, gfn, data, offset, len); | |
2870 | } | |
2871 | EXPORT_SYMBOL_GPL(kvm_vcpu_read_guest_atomic); | |
2872 | ||
28bd726a PX |
2873 | static int __kvm_write_guest_page(struct kvm *kvm, |
2874 | struct kvm_memory_slot *memslot, gfn_t gfn, | |
8e73485c | 2875 | const void *data, int offset, int len) |
195aefde | 2876 | { |
e0506bcb IE |
2877 | int r; |
2878 | unsigned long addr; | |
195aefde | 2879 | |
251eb841 | 2880 | addr = gfn_to_hva_memslot(memslot, gfn); |
e0506bcb IE |
2881 | if (kvm_is_error_hva(addr)) |
2882 | return -EFAULT; | |
8b0cedff | 2883 | r = __copy_to_user((void __user *)addr + offset, data, len); |
e0506bcb | 2884 | if (r) |
195aefde | 2885 | return -EFAULT; |
28bd726a | 2886 | mark_page_dirty_in_slot(kvm, memslot, gfn); |
195aefde IE |
2887 | return 0; |
2888 | } | |
8e73485c PB |
2889 | |
2890 | int kvm_write_guest_page(struct kvm *kvm, gfn_t gfn, | |
2891 | const void *data, int offset, int len) | |
2892 | { | |
2893 | struct kvm_memory_slot *slot = gfn_to_memslot(kvm, gfn); | |
2894 | ||
28bd726a | 2895 | return __kvm_write_guest_page(kvm, slot, gfn, data, offset, len); |
8e73485c | 2896 | } |
195aefde IE |
2897 | EXPORT_SYMBOL_GPL(kvm_write_guest_page); |
2898 | ||
8e73485c PB |
2899 | int kvm_vcpu_write_guest_page(struct kvm_vcpu *vcpu, gfn_t gfn, |
2900 | const void *data, int offset, int len) | |
2901 | { | |
2902 | struct kvm_memory_slot *slot = kvm_vcpu_gfn_to_memslot(vcpu, gfn); | |
2903 | ||
28bd726a | 2904 | return __kvm_write_guest_page(vcpu->kvm, slot, gfn, data, offset, len); |
8e73485c PB |
2905 | } |
2906 | EXPORT_SYMBOL_GPL(kvm_vcpu_write_guest_page); | |
2907 | ||
195aefde IE |
2908 | int kvm_write_guest(struct kvm *kvm, gpa_t gpa, const void *data, |
2909 | unsigned long len) | |
2910 | { | |
2911 | gfn_t gfn = gpa >> PAGE_SHIFT; | |
2912 | int seg; | |
2913 | int offset = offset_in_page(gpa); | |
2914 | int ret; | |
2915 | ||
2916 | while ((seg = next_segment(len, offset)) != 0) { | |
2917 | ret = kvm_write_guest_page(kvm, gfn, data, offset, seg); | |
2918 | if (ret < 0) | |
2919 | return ret; | |
2920 | offset = 0; | |
2921 | len -= seg; | |
2922 | data += seg; | |
2923 | ++gfn; | |
2924 | } | |
2925 | return 0; | |
2926 | } | |
ff651cb6 | 2927 | EXPORT_SYMBOL_GPL(kvm_write_guest); |
195aefde | 2928 | |
8e73485c PB |
2929 | int kvm_vcpu_write_guest(struct kvm_vcpu *vcpu, gpa_t gpa, const void *data, |
2930 | unsigned long len) | |
2931 | { | |
2932 | gfn_t gfn = gpa >> PAGE_SHIFT; | |
2933 | int seg; | |
2934 | int offset = offset_in_page(gpa); | |
2935 | int ret; | |
2936 | ||
2937 | while ((seg = next_segment(len, offset)) != 0) { | |
2938 | ret = kvm_vcpu_write_guest_page(vcpu, gfn, data, offset, seg); | |
2939 | if (ret < 0) | |
2940 | return ret; | |
2941 | offset = 0; | |
2942 | len -= seg; | |
2943 | data += seg; | |
2944 | ++gfn; | |
2945 | } | |
2946 | return 0; | |
2947 | } | |
2948 | EXPORT_SYMBOL_GPL(kvm_vcpu_write_guest); | |
2949 | ||
5a2d4365 PB |
2950 | static int __kvm_gfn_to_hva_cache_init(struct kvm_memslots *slots, |
2951 | struct gfn_to_hva_cache *ghc, | |
2952 | gpa_t gpa, unsigned long len) | |
49c7754c | 2953 | { |
49c7754c | 2954 | int offset = offset_in_page(gpa); |
8f964525 AH |
2955 | gfn_t start_gfn = gpa >> PAGE_SHIFT; |
2956 | gfn_t end_gfn = (gpa + len - 1) >> PAGE_SHIFT; | |
2957 | gfn_t nr_pages_needed = end_gfn - start_gfn + 1; | |
2958 | gfn_t nr_pages_avail; | |
49c7754c | 2959 | |
6ad1e29f | 2960 | /* Update ghc->generation before performing any error checks. */ |
49c7754c | 2961 | ghc->generation = slots->generation; |
6ad1e29f SC |
2962 | |
2963 | if (start_gfn > end_gfn) { | |
2964 | ghc->hva = KVM_HVA_ERR_BAD; | |
2965 | return -EINVAL; | |
2966 | } | |
f1b9dd5e JM |
2967 | |
2968 | /* | |
2969 | * If the requested region crosses two memslots, we still | |
2970 | * verify that the entire region is valid here. | |
2971 | */ | |
6ad1e29f | 2972 | for ( ; start_gfn <= end_gfn; start_gfn += nr_pages_avail) { |
f1b9dd5e JM |
2973 | ghc->memslot = __gfn_to_memslot(slots, start_gfn); |
2974 | ghc->hva = gfn_to_hva_many(ghc->memslot, start_gfn, | |
2975 | &nr_pages_avail); | |
2976 | if (kvm_is_error_hva(ghc->hva)) | |
6ad1e29f | 2977 | return -EFAULT; |
f1b9dd5e JM |
2978 | } |
2979 | ||
2980 | /* Use the slow path for cross page reads and writes. */ | |
6ad1e29f | 2981 | if (nr_pages_needed == 1) |
49c7754c | 2982 | ghc->hva += offset; |
f1b9dd5e | 2983 | else |
8f964525 | 2984 | ghc->memslot = NULL; |
f1b9dd5e | 2985 | |
6ad1e29f SC |
2986 | ghc->gpa = gpa; |
2987 | ghc->len = len; | |
2988 | return 0; | |
49c7754c | 2989 | } |
5a2d4365 | 2990 | |
4e335d9e | 2991 | int kvm_gfn_to_hva_cache_init(struct kvm *kvm, struct gfn_to_hva_cache *ghc, |
5a2d4365 PB |
2992 | gpa_t gpa, unsigned long len) |
2993 | { | |
4e335d9e | 2994 | struct kvm_memslots *slots = kvm_memslots(kvm); |
5a2d4365 PB |
2995 | return __kvm_gfn_to_hva_cache_init(slots, ghc, gpa, len); |
2996 | } | |
4e335d9e | 2997 | EXPORT_SYMBOL_GPL(kvm_gfn_to_hva_cache_init); |
49c7754c | 2998 | |
4e335d9e | 2999 | int kvm_write_guest_offset_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc, |
7a86dab8 JM |
3000 | void *data, unsigned int offset, |
3001 | unsigned long len) | |
49c7754c | 3002 | { |
4e335d9e | 3003 | struct kvm_memslots *slots = kvm_memslots(kvm); |
49c7754c | 3004 | int r; |
4ec6e863 | 3005 | gpa_t gpa = ghc->gpa + offset; |
49c7754c | 3006 | |
4ec6e863 | 3007 | BUG_ON(len + offset > ghc->len); |
8f964525 | 3008 | |
dc9ce71e SC |
3009 | if (slots->generation != ghc->generation) { |
3010 | if (__kvm_gfn_to_hva_cache_init(slots, ghc, ghc->gpa, ghc->len)) | |
3011 | return -EFAULT; | |
3012 | } | |
8f964525 | 3013 | |
49c7754c GN |
3014 | if (kvm_is_error_hva(ghc->hva)) |
3015 | return -EFAULT; | |
3016 | ||
fcfbc617 SC |
3017 | if (unlikely(!ghc->memslot)) |
3018 | return kvm_write_guest(kvm, gpa, data, len); | |
3019 | ||
4ec6e863 | 3020 | r = __copy_to_user((void __user *)ghc->hva + offset, data, len); |
49c7754c GN |
3021 | if (r) |
3022 | return -EFAULT; | |
28bd726a | 3023 | mark_page_dirty_in_slot(kvm, ghc->memslot, gpa >> PAGE_SHIFT); |
49c7754c GN |
3024 | |
3025 | return 0; | |
3026 | } | |
4e335d9e | 3027 | EXPORT_SYMBOL_GPL(kvm_write_guest_offset_cached); |
4ec6e863 | 3028 | |
4e335d9e PB |
3029 | int kvm_write_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc, |
3030 | void *data, unsigned long len) | |
4ec6e863 | 3031 | { |
4e335d9e | 3032 | return kvm_write_guest_offset_cached(kvm, ghc, data, 0, len); |
4ec6e863 | 3033 | } |
4e335d9e | 3034 | EXPORT_SYMBOL_GPL(kvm_write_guest_cached); |
49c7754c | 3035 | |
0958f0ce VK |
3036 | int kvm_read_guest_offset_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc, |
3037 | void *data, unsigned int offset, | |
3038 | unsigned long len) | |
e03b644f | 3039 | { |
4e335d9e | 3040 | struct kvm_memslots *slots = kvm_memslots(kvm); |
e03b644f | 3041 | int r; |
0958f0ce | 3042 | gpa_t gpa = ghc->gpa + offset; |
e03b644f | 3043 | |
0958f0ce | 3044 | BUG_ON(len + offset > ghc->len); |
8f964525 | 3045 | |
dc9ce71e SC |
3046 | if (slots->generation != ghc->generation) { |
3047 | if (__kvm_gfn_to_hva_cache_init(slots, ghc, ghc->gpa, ghc->len)) | |
3048 | return -EFAULT; | |
3049 | } | |
8f964525 | 3050 | |
e03b644f GN |
3051 | if (kvm_is_error_hva(ghc->hva)) |
3052 | return -EFAULT; | |
3053 | ||
fcfbc617 | 3054 | if (unlikely(!ghc->memslot)) |
0958f0ce | 3055 | return kvm_read_guest(kvm, gpa, data, len); |
fcfbc617 | 3056 | |
0958f0ce | 3057 | r = __copy_from_user(data, (void __user *)ghc->hva + offset, len); |
e03b644f GN |
3058 | if (r) |
3059 | return -EFAULT; | |
3060 | ||
3061 | return 0; | |
3062 | } | |
0958f0ce VK |
3063 | EXPORT_SYMBOL_GPL(kvm_read_guest_offset_cached); |
3064 | ||
3065 | int kvm_read_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc, | |
3066 | void *data, unsigned long len) | |
3067 | { | |
3068 | return kvm_read_guest_offset_cached(kvm, ghc, data, 0, len); | |
3069 | } | |
4e335d9e | 3070 | EXPORT_SYMBOL_GPL(kvm_read_guest_cached); |
e03b644f | 3071 | |
195aefde IE |
3072 | int kvm_clear_guest(struct kvm *kvm, gpa_t gpa, unsigned long len) |
3073 | { | |
2f541442 | 3074 | const void *zero_page = (const void *) __va(page_to_phys(ZERO_PAGE(0))); |
195aefde IE |
3075 | gfn_t gfn = gpa >> PAGE_SHIFT; |
3076 | int seg; | |
3077 | int offset = offset_in_page(gpa); | |
3078 | int ret; | |
3079 | ||
bfda0e84 | 3080 | while ((seg = next_segment(len, offset)) != 0) { |
2f541442 | 3081 | ret = kvm_write_guest_page(kvm, gfn, zero_page, offset, len); |
195aefde IE |
3082 | if (ret < 0) |
3083 | return ret; | |
3084 | offset = 0; | |
3085 | len -= seg; | |
3086 | ++gfn; | |
3087 | } | |
3088 | return 0; | |
3089 | } | |
3090 | EXPORT_SYMBOL_GPL(kvm_clear_guest); | |
3091 | ||
28bd726a PX |
3092 | void mark_page_dirty_in_slot(struct kvm *kvm, |
3093 | struct kvm_memory_slot *memslot, | |
3094 | gfn_t gfn) | |
6aa8b732 | 3095 | { |
044c59c4 | 3096 | if (memslot && kvm_slot_dirty_track_enabled(memslot)) { |
7e9d619d | 3097 | unsigned long rel_gfn = gfn - memslot->base_gfn; |
fb04a1ed | 3098 | u32 slot = (memslot->as_id << 16) | memslot->id; |
6aa8b732 | 3099 | |
fb04a1ed PX |
3100 | if (kvm->dirty_ring_size) |
3101 | kvm_dirty_ring_push(kvm_dirty_ring_get(kvm), | |
3102 | slot, rel_gfn); | |
3103 | else | |
3104 | set_bit_le(rel_gfn, memslot->dirty_bitmap); | |
6aa8b732 AK |
3105 | } |
3106 | } | |
a6a0b05d | 3107 | EXPORT_SYMBOL_GPL(mark_page_dirty_in_slot); |
6aa8b732 | 3108 | |
49c7754c GN |
3109 | void mark_page_dirty(struct kvm *kvm, gfn_t gfn) |
3110 | { | |
3111 | struct kvm_memory_slot *memslot; | |
3112 | ||
3113 | memslot = gfn_to_memslot(kvm, gfn); | |
28bd726a | 3114 | mark_page_dirty_in_slot(kvm, memslot, gfn); |
49c7754c | 3115 | } |
2ba9f0d8 | 3116 | EXPORT_SYMBOL_GPL(mark_page_dirty); |
49c7754c | 3117 | |
8e73485c PB |
3118 | void kvm_vcpu_mark_page_dirty(struct kvm_vcpu *vcpu, gfn_t gfn) |
3119 | { | |
3120 | struct kvm_memory_slot *memslot; | |
3121 | ||
3122 | memslot = kvm_vcpu_gfn_to_memslot(vcpu, gfn); | |
28bd726a | 3123 | mark_page_dirty_in_slot(vcpu->kvm, memslot, gfn); |
8e73485c PB |
3124 | } |
3125 | EXPORT_SYMBOL_GPL(kvm_vcpu_mark_page_dirty); | |
3126 | ||
20b7035c JS |
3127 | void kvm_sigset_activate(struct kvm_vcpu *vcpu) |
3128 | { | |
3129 | if (!vcpu->sigset_active) | |
3130 | return; | |
3131 | ||
3132 | /* | |
3133 | * This does a lockless modification of ->real_blocked, which is fine | |
3134 | * because, only current can change ->real_blocked and all readers of | |
3135 | * ->real_blocked don't care as long ->real_blocked is always a subset | |
3136 | * of ->blocked. | |
3137 | */ | |
3138 | sigprocmask(SIG_SETMASK, &vcpu->sigset, ¤t->real_blocked); | |
3139 | } | |
3140 | ||
3141 | void kvm_sigset_deactivate(struct kvm_vcpu *vcpu) | |
3142 | { | |
3143 | if (!vcpu->sigset_active) | |
3144 | return; | |
3145 | ||
3146 | sigprocmask(SIG_SETMASK, ¤t->real_blocked, NULL); | |
3147 | sigemptyset(¤t->real_blocked); | |
3148 | } | |
3149 | ||
aca6ff29 WL |
3150 | static void grow_halt_poll_ns(struct kvm_vcpu *vcpu) |
3151 | { | |
dee339b5 | 3152 | unsigned int old, val, grow, grow_start; |
aca6ff29 | 3153 | |
2cbd7824 | 3154 | old = val = vcpu->halt_poll_ns; |
dee339b5 | 3155 | grow_start = READ_ONCE(halt_poll_ns_grow_start); |
6b6de68c | 3156 | grow = READ_ONCE(halt_poll_ns_grow); |
7fa08e71 NW |
3157 | if (!grow) |
3158 | goto out; | |
3159 | ||
dee339b5 NW |
3160 | val *= grow; |
3161 | if (val < grow_start) | |
3162 | val = grow_start; | |
aca6ff29 | 3163 | |
258785ef DM |
3164 | if (val > vcpu->kvm->max_halt_poll_ns) |
3165 | val = vcpu->kvm->max_halt_poll_ns; | |
313f636d | 3166 | |
aca6ff29 | 3167 | vcpu->halt_poll_ns = val; |
7fa08e71 | 3168 | out: |
2cbd7824 | 3169 | trace_kvm_halt_poll_ns_grow(vcpu->vcpu_id, val, old); |
aca6ff29 WL |
3170 | } |
3171 | ||
3172 | static void shrink_halt_poll_ns(struct kvm_vcpu *vcpu) | |
3173 | { | |
ae232ea4 | 3174 | unsigned int old, val, shrink, grow_start; |
aca6ff29 | 3175 | |
2cbd7824 | 3176 | old = val = vcpu->halt_poll_ns; |
6b6de68c | 3177 | shrink = READ_ONCE(halt_poll_ns_shrink); |
ae232ea4 | 3178 | grow_start = READ_ONCE(halt_poll_ns_grow_start); |
6b6de68c | 3179 | if (shrink == 0) |
aca6ff29 WL |
3180 | val = 0; |
3181 | else | |
6b6de68c | 3182 | val /= shrink; |
aca6ff29 | 3183 | |
ae232ea4 SS |
3184 | if (val < grow_start) |
3185 | val = 0; | |
3186 | ||
aca6ff29 | 3187 | vcpu->halt_poll_ns = val; |
2cbd7824 | 3188 | trace_kvm_halt_poll_ns_shrink(vcpu->vcpu_id, val, old); |
aca6ff29 WL |
3189 | } |
3190 | ||
f7819512 PB |
3191 | static int kvm_vcpu_check_block(struct kvm_vcpu *vcpu) |
3192 | { | |
50c28f21 JS |
3193 | int ret = -EINTR; |
3194 | int idx = srcu_read_lock(&vcpu->kvm->srcu); | |
3195 | ||
f7819512 PB |
3196 | if (kvm_arch_vcpu_runnable(vcpu)) { |
3197 | kvm_make_request(KVM_REQ_UNHALT, vcpu); | |
50c28f21 | 3198 | goto out; |
f7819512 PB |
3199 | } |
3200 | if (kvm_cpu_has_pending_timer(vcpu)) | |
50c28f21 | 3201 | goto out; |
f7819512 | 3202 | if (signal_pending(current)) |
50c28f21 | 3203 | goto out; |
084071d5 MT |
3204 | if (kvm_check_request(KVM_REQ_UNBLOCK, vcpu)) |
3205 | goto out; | |
f7819512 | 3206 | |
50c28f21 JS |
3207 | ret = 0; |
3208 | out: | |
3209 | srcu_read_unlock(&vcpu->kvm->srcu, idx); | |
3210 | return ret; | |
f7819512 PB |
3211 | } |
3212 | ||
cb953129 DM |
3213 | static inline void |
3214 | update_halt_poll_stats(struct kvm_vcpu *vcpu, u64 poll_ns, bool waited) | |
3215 | { | |
3216 | if (waited) | |
0193cc90 | 3217 | vcpu->stat.generic.halt_poll_fail_ns += poll_ns; |
cb953129 | 3218 | else |
0193cc90 | 3219 | vcpu->stat.generic.halt_poll_success_ns += poll_ns; |
cb953129 DM |
3220 | } |
3221 | ||
b6958ce4 ED |
3222 | /* |
3223 | * The vCPU has executed a HLT instruction with in-kernel mode enabled. | |
3224 | */ | |
8776e519 | 3225 | void kvm_vcpu_block(struct kvm_vcpu *vcpu) |
d3bef15f | 3226 | { |
cb953129 | 3227 | ktime_t start, cur, poll_end; |
f7819512 | 3228 | bool waited = false; |
aca6ff29 | 3229 | u64 block_ns; |
f7819512 | 3230 | |
07ab0f8d MZ |
3231 | kvm_arch_vcpu_blocking(vcpu); |
3232 | ||
cb953129 | 3233 | start = cur = poll_end = ktime_get(); |
cdd6ad3a | 3234 | if (vcpu->halt_poll_ns && !kvm_arch_no_poll(vcpu)) { |
19020f8a | 3235 | ktime_t stop = ktime_add_ns(ktime_get(), vcpu->halt_poll_ns); |
f95ef0cd | 3236 | |
0193cc90 | 3237 | ++vcpu->stat.generic.halt_attempted_poll; |
f7819512 PB |
3238 | do { |
3239 | /* | |
3240 | * This sets KVM_REQ_UNHALT if an interrupt | |
3241 | * arrives. | |
3242 | */ | |
3243 | if (kvm_vcpu_check_block(vcpu) < 0) { | |
0193cc90 | 3244 | ++vcpu->stat.generic.halt_successful_poll; |
3491caf2 | 3245 | if (!vcpu_valid_wakeup(vcpu)) |
0193cc90 | 3246 | ++vcpu->stat.generic.halt_poll_invalid; |
8ccba534 JZ |
3247 | |
3248 | KVM_STATS_LOG_HIST_UPDATE( | |
3249 | vcpu->stat.generic.halt_poll_success_hist, | |
3250 | ktime_to_ns(ktime_get()) - | |
3251 | ktime_to_ns(start)); | |
f7819512 PB |
3252 | goto out; |
3253 | } | |
74775654 | 3254 | cpu_relax(); |
cb953129 | 3255 | poll_end = cur = ktime_get(); |
6bd5b743 | 3256 | } while (kvm_vcpu_can_poll(cur, stop)); |
8ccba534 JZ |
3257 | |
3258 | KVM_STATS_LOG_HIST_UPDATE( | |
3259 | vcpu->stat.generic.halt_poll_fail_hist, | |
3260 | ktime_to_ns(ktime_get()) - ktime_to_ns(start)); | |
f7819512 | 3261 | } |
e5c239cf | 3262 | |
8ccba534 | 3263 | |
da4ad88c | 3264 | prepare_to_rcuwait(&vcpu->wait); |
e5c239cf | 3265 | for (;;) { |
da4ad88c | 3266 | set_current_state(TASK_INTERRUPTIBLE); |
e5c239cf | 3267 | |
f7819512 | 3268 | if (kvm_vcpu_check_block(vcpu) < 0) |
e5c239cf MT |
3269 | break; |
3270 | ||
f7819512 | 3271 | waited = true; |
b6958ce4 | 3272 | schedule(); |
b6958ce4 | 3273 | } |
da4ad88c | 3274 | finish_rcuwait(&vcpu->wait); |
f7819512 | 3275 | cur = ktime_get(); |
87bcc5fa JZ |
3276 | if (waited) { |
3277 | vcpu->stat.generic.halt_wait_ns += | |
3278 | ktime_to_ns(cur) - ktime_to_ns(poll_end); | |
8ccba534 JZ |
3279 | KVM_STATS_LOG_HIST_UPDATE(vcpu->stat.generic.halt_wait_hist, |
3280 | ktime_to_ns(cur) - ktime_to_ns(poll_end)); | |
87bcc5fa | 3281 | } |
f7819512 | 3282 | out: |
07ab0f8d | 3283 | kvm_arch_vcpu_unblocking(vcpu); |
aca6ff29 WL |
3284 | block_ns = ktime_to_ns(cur) - ktime_to_ns(start); |
3285 | ||
cb953129 DM |
3286 | update_halt_poll_stats( |
3287 | vcpu, ktime_to_ns(ktime_sub(poll_end, start)), waited); | |
3288 | ||
44551b2f WL |
3289 | if (!kvm_arch_no_poll(vcpu)) { |
3290 | if (!vcpu_valid_wakeup(vcpu)) { | |
aca6ff29 | 3291 | shrink_halt_poll_ns(vcpu); |
acd05785 | 3292 | } else if (vcpu->kvm->max_halt_poll_ns) { |
44551b2f WL |
3293 | if (block_ns <= vcpu->halt_poll_ns) |
3294 | ; | |
3295 | /* we had a long block, shrink polling */ | |
acd05785 DM |
3296 | else if (vcpu->halt_poll_ns && |
3297 | block_ns > vcpu->kvm->max_halt_poll_ns) | |
44551b2f WL |
3298 | shrink_halt_poll_ns(vcpu); |
3299 | /* we had a short halt and our poll time is too small */ | |
acd05785 DM |
3300 | else if (vcpu->halt_poll_ns < vcpu->kvm->max_halt_poll_ns && |
3301 | block_ns < vcpu->kvm->max_halt_poll_ns) | |
44551b2f WL |
3302 | grow_halt_poll_ns(vcpu); |
3303 | } else { | |
3304 | vcpu->halt_poll_ns = 0; | |
3305 | } | |
3306 | } | |
aca6ff29 | 3307 | |
3491caf2 CB |
3308 | trace_kvm_vcpu_wakeup(block_ns, waited, vcpu_valid_wakeup(vcpu)); |
3309 | kvm_arch_vcpu_block_finish(vcpu); | |
b6958ce4 | 3310 | } |
2ba9f0d8 | 3311 | EXPORT_SYMBOL_GPL(kvm_vcpu_block); |
b6958ce4 | 3312 | |
178f02ff | 3313 | bool kvm_vcpu_wake_up(struct kvm_vcpu *vcpu) |
b6d33834 | 3314 | { |
da4ad88c | 3315 | struct rcuwait *waitp; |
b6d33834 | 3316 | |
da4ad88c DB |
3317 | waitp = kvm_arch_vcpu_get_wait(vcpu); |
3318 | if (rcuwait_wake_up(waitp)) { | |
d73eb57b | 3319 | WRITE_ONCE(vcpu->ready, true); |
0193cc90 | 3320 | ++vcpu->stat.generic.halt_wakeup; |
178f02ff | 3321 | return true; |
b6d33834 CD |
3322 | } |
3323 | ||
178f02ff | 3324 | return false; |
dd1a4cc1 RK |
3325 | } |
3326 | EXPORT_SYMBOL_GPL(kvm_vcpu_wake_up); | |
3327 | ||
0266c894 | 3328 | #ifndef CONFIG_S390 |
dd1a4cc1 RK |
3329 | /* |
3330 | * Kick a sleeping VCPU, or a guest VCPU in guest mode, into host kernel mode. | |
3331 | */ | |
3332 | void kvm_vcpu_kick(struct kvm_vcpu *vcpu) | |
3333 | { | |
85b64045 | 3334 | int me, cpu; |
dd1a4cc1 | 3335 | |
178f02ff RK |
3336 | if (kvm_vcpu_wake_up(vcpu)) |
3337 | return; | |
3338 | ||
85b64045 SC |
3339 | /* |
3340 | * Note, the vCPU could get migrated to a different pCPU at any point | |
3341 | * after kvm_arch_vcpu_should_kick(), which could result in sending an | |
3342 | * IPI to the previous pCPU. But, that's ok because the purpose of the | |
3343 | * IPI is to force the vCPU to leave IN_GUEST_MODE, and migrating the | |
3344 | * vCPU also requires it to leave IN_GUEST_MODE. | |
3345 | */ | |
b6d33834 | 3346 | me = get_cpu(); |
85b64045 SC |
3347 | if (kvm_arch_vcpu_should_kick(vcpu)) { |
3348 | cpu = READ_ONCE(vcpu->cpu); | |
3349 | if (cpu != me && (unsigned)cpu < nr_cpu_ids && cpu_online(cpu)) | |
b6d33834 | 3350 | smp_send_reschedule(cpu); |
85b64045 | 3351 | } |
b6d33834 CD |
3352 | put_cpu(); |
3353 | } | |
a20ed54d | 3354 | EXPORT_SYMBOL_GPL(kvm_vcpu_kick); |
0266c894 | 3355 | #endif /* !CONFIG_S390 */ |
b6d33834 | 3356 | |
fa93384f | 3357 | int kvm_vcpu_yield_to(struct kvm_vcpu *target) |
41628d33 KW |
3358 | { |
3359 | struct pid *pid; | |
3360 | struct task_struct *task = NULL; | |
fa93384f | 3361 | int ret = 0; |
41628d33 KW |
3362 | |
3363 | rcu_read_lock(); | |
3364 | pid = rcu_dereference(target->pid); | |
3365 | if (pid) | |
27fbe64b | 3366 | task = get_pid_task(pid, PIDTYPE_PID); |
41628d33 KW |
3367 | rcu_read_unlock(); |
3368 | if (!task) | |
c45c528e | 3369 | return ret; |
c45c528e | 3370 | ret = yield_to(task, 1); |
41628d33 | 3371 | put_task_struct(task); |
c45c528e R |
3372 | |
3373 | return ret; | |
41628d33 KW |
3374 | } |
3375 | EXPORT_SYMBOL_GPL(kvm_vcpu_yield_to); | |
3376 | ||
06e48c51 R |
3377 | /* |
3378 | * Helper that checks whether a VCPU is eligible for directed yield. | |
3379 | * Most eligible candidate to yield is decided by following heuristics: | |
3380 | * | |
3381 | * (a) VCPU which has not done pl-exit or cpu relax intercepted recently | |
3382 | * (preempted lock holder), indicated by @in_spin_loop. | |
656012c7 | 3383 | * Set at the beginning and cleared at the end of interception/PLE handler. |
06e48c51 R |
3384 | * |
3385 | * (b) VCPU which has done pl-exit/ cpu relax intercepted but did not get | |
3386 | * chance last time (mostly it has become eligible now since we have probably | |
3387 | * yielded to lockholder in last iteration. This is done by toggling | |
3388 | * @dy_eligible each time a VCPU checked for eligibility.) | |
3389 | * | |
3390 | * Yielding to a recently pl-exited/cpu relax intercepted VCPU before yielding | |
3391 | * to preempted lock-holder could result in wrong VCPU selection and CPU | |
3392 | * burning. Giving priority for a potential lock-holder increases lock | |
3393 | * progress. | |
3394 | * | |
3395 | * Since algorithm is based on heuristics, accessing another VCPU data without | |
3396 | * locking does not harm. It may result in trying to yield to same VCPU, fail | |
3397 | * and continue with next VCPU and so on. | |
3398 | */ | |
7940876e | 3399 | static bool kvm_vcpu_eligible_for_directed_yield(struct kvm_vcpu *vcpu) |
06e48c51 | 3400 | { |
4a55dd72 | 3401 | #ifdef CONFIG_HAVE_KVM_CPU_RELAX_INTERCEPT |
06e48c51 R |
3402 | bool eligible; |
3403 | ||
3404 | eligible = !vcpu->spin_loop.in_spin_loop || | |
34656113 | 3405 | vcpu->spin_loop.dy_eligible; |
06e48c51 R |
3406 | |
3407 | if (vcpu->spin_loop.in_spin_loop) | |
3408 | kvm_vcpu_set_dy_eligible(vcpu, !vcpu->spin_loop.dy_eligible); | |
3409 | ||
3410 | return eligible; | |
4a55dd72 SW |
3411 | #else |
3412 | return true; | |
06e48c51 | 3413 | #endif |
4a55dd72 | 3414 | } |
c45c528e | 3415 | |
17e433b5 WL |
3416 | /* |
3417 | * Unlike kvm_arch_vcpu_runnable, this function is called outside | |
3418 | * a vcpu_load/vcpu_put pair. However, for most architectures | |
3419 | * kvm_arch_vcpu_runnable does not require vcpu_load. | |
3420 | */ | |
3421 | bool __weak kvm_arch_dy_runnable(struct kvm_vcpu *vcpu) | |
3422 | { | |
3423 | return kvm_arch_vcpu_runnable(vcpu); | |
3424 | } | |
3425 | ||
3426 | static bool vcpu_dy_runnable(struct kvm_vcpu *vcpu) | |
3427 | { | |
3428 | if (kvm_arch_dy_runnable(vcpu)) | |
3429 | return true; | |
3430 | ||
3431 | #ifdef CONFIG_KVM_ASYNC_PF | |
3432 | if (!list_empty_careful(&vcpu->async_pf.done)) | |
3433 | return true; | |
3434 | #endif | |
3435 | ||
3436 | return false; | |
3437 | } | |
3438 | ||
52acd22f WL |
3439 | bool __weak kvm_arch_dy_has_pending_interrupt(struct kvm_vcpu *vcpu) |
3440 | { | |
3441 | return false; | |
3442 | } | |
3443 | ||
199b5763 | 3444 | void kvm_vcpu_on_spin(struct kvm_vcpu *me, bool yield_to_kernel_mode) |
d255f4f2 | 3445 | { |
217ece61 RR |
3446 | struct kvm *kvm = me->kvm; |
3447 | struct kvm_vcpu *vcpu; | |
3448 | int last_boosted_vcpu = me->kvm->last_boosted_vcpu; | |
3449 | int yielded = 0; | |
c45c528e | 3450 | int try = 3; |
217ece61 RR |
3451 | int pass; |
3452 | int i; | |
d255f4f2 | 3453 | |
4c088493 | 3454 | kvm_vcpu_set_in_spin_loop(me, true); |
217ece61 RR |
3455 | /* |
3456 | * We boost the priority of a VCPU that is runnable but not | |
3457 | * currently running, because it got preempted by something | |
3458 | * else and called schedule in __vcpu_run. Hopefully that | |
3459 | * VCPU is holding the lock that we need and will release it. | |
3460 | * We approximate round-robin by starting at the last boosted VCPU. | |
3461 | */ | |
c45c528e | 3462 | for (pass = 0; pass < 2 && !yielded && try; pass++) { |
217ece61 | 3463 | kvm_for_each_vcpu(i, vcpu, kvm) { |
5cfc2aab | 3464 | if (!pass && i <= last_boosted_vcpu) { |
217ece61 RR |
3465 | i = last_boosted_vcpu; |
3466 | continue; | |
3467 | } else if (pass && i > last_boosted_vcpu) | |
3468 | break; | |
d73eb57b | 3469 | if (!READ_ONCE(vcpu->ready)) |
7bc7ae25 | 3470 | continue; |
217ece61 RR |
3471 | if (vcpu == me) |
3472 | continue; | |
da4ad88c DB |
3473 | if (rcuwait_active(&vcpu->wait) && |
3474 | !vcpu_dy_runnable(vcpu)) | |
217ece61 | 3475 | continue; |
046ddeed | 3476 | if (READ_ONCE(vcpu->preempted) && yield_to_kernel_mode && |
52acd22f WL |
3477 | !kvm_arch_dy_has_pending_interrupt(vcpu) && |
3478 | !kvm_arch_vcpu_in_kernel(vcpu)) | |
199b5763 | 3479 | continue; |
06e48c51 R |
3480 | if (!kvm_vcpu_eligible_for_directed_yield(vcpu)) |
3481 | continue; | |
c45c528e R |
3482 | |
3483 | yielded = kvm_vcpu_yield_to(vcpu); | |
3484 | if (yielded > 0) { | |
217ece61 | 3485 | kvm->last_boosted_vcpu = i; |
217ece61 | 3486 | break; |
c45c528e R |
3487 | } else if (yielded < 0) { |
3488 | try--; | |
3489 | if (!try) | |
3490 | break; | |
217ece61 | 3491 | } |
217ece61 RR |
3492 | } |
3493 | } | |
4c088493 | 3494 | kvm_vcpu_set_in_spin_loop(me, false); |
06e48c51 R |
3495 | |
3496 | /* Ensure vcpu is not eligible during next spinloop */ | |
3497 | kvm_vcpu_set_dy_eligible(me, false); | |
d255f4f2 ZE |
3498 | } |
3499 | EXPORT_SYMBOL_GPL(kvm_vcpu_on_spin); | |
3500 | ||
fb04a1ed PX |
3501 | static bool kvm_page_in_dirty_ring(struct kvm *kvm, unsigned long pgoff) |
3502 | { | |
3503 | #if KVM_DIRTY_LOG_PAGE_OFFSET > 0 | |
3504 | return (pgoff >= KVM_DIRTY_LOG_PAGE_OFFSET) && | |
3505 | (pgoff < KVM_DIRTY_LOG_PAGE_OFFSET + | |
3506 | kvm->dirty_ring_size / PAGE_SIZE); | |
3507 | #else | |
3508 | return false; | |
3509 | #endif | |
3510 | } | |
3511 | ||
1499fa80 | 3512 | static vm_fault_t kvm_vcpu_fault(struct vm_fault *vmf) |
9a2bb7f4 | 3513 | { |
11bac800 | 3514 | struct kvm_vcpu *vcpu = vmf->vma->vm_file->private_data; |
9a2bb7f4 AK |
3515 | struct page *page; |
3516 | ||
e4a533a4 | 3517 | if (vmf->pgoff == 0) |
039576c0 | 3518 | page = virt_to_page(vcpu->run); |
09566765 | 3519 | #ifdef CONFIG_X86 |
e4a533a4 | 3520 | else if (vmf->pgoff == KVM_PIO_PAGE_OFFSET) |
ad312c7c | 3521 | page = virt_to_page(vcpu->arch.pio_data); |
5f94c174 | 3522 | #endif |
4b4357e0 | 3523 | #ifdef CONFIG_KVM_MMIO |
5f94c174 LV |
3524 | else if (vmf->pgoff == KVM_COALESCED_MMIO_PAGE_OFFSET) |
3525 | page = virt_to_page(vcpu->kvm->coalesced_mmio_ring); | |
09566765 | 3526 | #endif |
fb04a1ed PX |
3527 | else if (kvm_page_in_dirty_ring(vcpu->kvm, vmf->pgoff)) |
3528 | page = kvm_dirty_ring_get_page( | |
3529 | &vcpu->dirty_ring, | |
3530 | vmf->pgoff - KVM_DIRTY_LOG_PAGE_OFFSET); | |
039576c0 | 3531 | else |
5b1c1493 | 3532 | return kvm_arch_vcpu_fault(vcpu, vmf); |
9a2bb7f4 | 3533 | get_page(page); |
e4a533a4 NP |
3534 | vmf->page = page; |
3535 | return 0; | |
9a2bb7f4 AK |
3536 | } |
3537 | ||
f0f37e2f | 3538 | static const struct vm_operations_struct kvm_vcpu_vm_ops = { |
e4a533a4 | 3539 | .fault = kvm_vcpu_fault, |
9a2bb7f4 AK |
3540 | }; |
3541 | ||
3542 | static int kvm_vcpu_mmap(struct file *file, struct vm_area_struct *vma) | |
3543 | { | |
fb04a1ed | 3544 | struct kvm_vcpu *vcpu = file->private_data; |
11476d27 | 3545 | unsigned long pages = vma_pages(vma); |
fb04a1ed PX |
3546 | |
3547 | if ((kvm_page_in_dirty_ring(vcpu->kvm, vma->vm_pgoff) || | |
3548 | kvm_page_in_dirty_ring(vcpu->kvm, vma->vm_pgoff + pages - 1)) && | |
3549 | ((vma->vm_flags & VM_EXEC) || !(vma->vm_flags & VM_SHARED))) | |
3550 | return -EINVAL; | |
3551 | ||
9a2bb7f4 AK |
3552 | vma->vm_ops = &kvm_vcpu_vm_ops; |
3553 | return 0; | |
3554 | } | |
3555 | ||
bccf2150 AK |
3556 | static int kvm_vcpu_release(struct inode *inode, struct file *filp) |
3557 | { | |
3558 | struct kvm_vcpu *vcpu = filp->private_data; | |
3559 | ||
66c0b394 | 3560 | kvm_put_kvm(vcpu->kvm); |
bccf2150 AK |
3561 | return 0; |
3562 | } | |
3563 | ||
3d3aab1b | 3564 | static struct file_operations kvm_vcpu_fops = { |
bccf2150 AK |
3565 | .release = kvm_vcpu_release, |
3566 | .unlocked_ioctl = kvm_vcpu_ioctl, | |
9a2bb7f4 | 3567 | .mmap = kvm_vcpu_mmap, |
6038f373 | 3568 | .llseek = noop_llseek, |
7ddfd3e0 | 3569 | KVM_COMPAT(kvm_vcpu_compat_ioctl), |
bccf2150 AK |
3570 | }; |
3571 | ||
3572 | /* | |
3573 | * Allocates an inode for the vcpu. | |
3574 | */ | |
3575 | static int create_vcpu_fd(struct kvm_vcpu *vcpu) | |
3576 | { | |
e46b4692 MY |
3577 | char name[8 + 1 + ITOA_MAX_LEN + 1]; |
3578 | ||
3579 | snprintf(name, sizeof(name), "kvm-vcpu:%d", vcpu->vcpu_id); | |
3580 | return anon_inode_getfd(name, &kvm_vcpu_fops, vcpu, O_RDWR | O_CLOEXEC); | |
bccf2150 AK |
3581 | } |
3582 | ||
3e7093d0 | 3583 | static void kvm_create_vcpu_debugfs(struct kvm_vcpu *vcpu) |
45b5939e | 3584 | { |
741cbbae | 3585 | #ifdef __KVM_HAVE_ARCH_VCPU_DEBUGFS |
d56f5136 | 3586 | struct dentry *debugfs_dentry; |
45b5939e | 3587 | char dir_name[ITOA_MAX_LEN * 2]; |
45b5939e | 3588 | |
45b5939e | 3589 | if (!debugfs_initialized()) |
3e7093d0 | 3590 | return; |
45b5939e LC |
3591 | |
3592 | snprintf(dir_name, sizeof(dir_name), "vcpu%d", vcpu->vcpu_id); | |
d56f5136 PB |
3593 | debugfs_dentry = debugfs_create_dir(dir_name, |
3594 | vcpu->kvm->debugfs_dentry); | |
45b5939e | 3595 | |
d56f5136 | 3596 | kvm_arch_create_vcpu_debugfs(vcpu, debugfs_dentry); |
741cbbae | 3597 | #endif |
45b5939e LC |
3598 | } |
3599 | ||
c5ea7660 AK |
3600 | /* |
3601 | * Creates some virtual cpus. Good luck creating more than one. | |
3602 | */ | |
73880c80 | 3603 | static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, u32 id) |
c5ea7660 AK |
3604 | { |
3605 | int r; | |
e09fefde | 3606 | struct kvm_vcpu *vcpu; |
8bd826d6 | 3607 | struct page *page; |
c5ea7660 | 3608 | |
0b1b1dfd | 3609 | if (id >= KVM_MAX_VCPU_ID) |
338c7dba AH |
3610 | return -EINVAL; |
3611 | ||
6c7caebc PB |
3612 | mutex_lock(&kvm->lock); |
3613 | if (kvm->created_vcpus == KVM_MAX_VCPUS) { | |
3614 | mutex_unlock(&kvm->lock); | |
3615 | return -EINVAL; | |
3616 | } | |
3617 | ||
3618 | kvm->created_vcpus++; | |
3619 | mutex_unlock(&kvm->lock); | |
3620 | ||
897cc38e SC |
3621 | r = kvm_arch_vcpu_precreate(kvm, id); |
3622 | if (r) | |
3623 | goto vcpu_decrement; | |
3624 | ||
85f47930 | 3625 | vcpu = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL_ACCOUNT); |
e529ef66 SC |
3626 | if (!vcpu) { |
3627 | r = -ENOMEM; | |
6c7caebc PB |
3628 | goto vcpu_decrement; |
3629 | } | |
c5ea7660 | 3630 | |
fcd97ad5 | 3631 | BUILD_BUG_ON(sizeof(struct kvm_run) > PAGE_SIZE); |
93bb59ca | 3632 | page = alloc_page(GFP_KERNEL_ACCOUNT | __GFP_ZERO); |
8bd826d6 SC |
3633 | if (!page) { |
3634 | r = -ENOMEM; | |
e529ef66 | 3635 | goto vcpu_free; |
8bd826d6 SC |
3636 | } |
3637 | vcpu->run = page_address(page); | |
3638 | ||
3639 | kvm_vcpu_init(vcpu, kvm, id); | |
e529ef66 SC |
3640 | |
3641 | r = kvm_arch_vcpu_create(vcpu); | |
3642 | if (r) | |
8bd826d6 | 3643 | goto vcpu_free_run_page; |
e529ef66 | 3644 | |
fb04a1ed PX |
3645 | if (kvm->dirty_ring_size) { |
3646 | r = kvm_dirty_ring_alloc(&vcpu->dirty_ring, | |
3647 | id, kvm->dirty_ring_size); | |
3648 | if (r) | |
3649 | goto arch_vcpu_destroy; | |
3650 | } | |
3651 | ||
11ec2804 | 3652 | mutex_lock(&kvm->lock); |
e09fefde DH |
3653 | if (kvm_get_vcpu_by_id(kvm, id)) { |
3654 | r = -EEXIST; | |
3655 | goto unlock_vcpu_destroy; | |
3656 | } | |
73880c80 | 3657 | |
8750e72a RK |
3658 | vcpu->vcpu_idx = atomic_read(&kvm->online_vcpus); |
3659 | BUG_ON(kvm->vcpus[vcpu->vcpu_idx]); | |
c5ea7660 | 3660 | |
ce55c049 JZ |
3661 | /* Fill the stats id string for the vcpu */ |
3662 | snprintf(vcpu->stats_id, sizeof(vcpu->stats_id), "kvm-%d/vcpu-%d", | |
3663 | task_pid_nr(current), id); | |
3664 | ||
fb3f0f51 | 3665 | /* Now it's all set up, let userspace reach it */ |
66c0b394 | 3666 | kvm_get_kvm(kvm); |
bccf2150 | 3667 | r = create_vcpu_fd(vcpu); |
73880c80 | 3668 | if (r < 0) { |
149487bd | 3669 | kvm_put_kvm_no_destroy(kvm); |
d780592b | 3670 | goto unlock_vcpu_destroy; |
73880c80 GN |
3671 | } |
3672 | ||
8750e72a | 3673 | kvm->vcpus[vcpu->vcpu_idx] = vcpu; |
dd489240 PB |
3674 | |
3675 | /* | |
3676 | * Pairs with smp_rmb() in kvm_get_vcpu. Write kvm->vcpus | |
3677 | * before kvm->online_vcpu's incremented value. | |
3678 | */ | |
73880c80 GN |
3679 | smp_wmb(); |
3680 | atomic_inc(&kvm->online_vcpus); | |
3681 | ||
73880c80 | 3682 | mutex_unlock(&kvm->lock); |
42897d86 | 3683 | kvm_arch_vcpu_postcreate(vcpu); |
63d04348 | 3684 | kvm_create_vcpu_debugfs(vcpu); |
fb3f0f51 | 3685 | return r; |
39c3b86e | 3686 | |
d780592b | 3687 | unlock_vcpu_destroy: |
7d8fece6 | 3688 | mutex_unlock(&kvm->lock); |
fb04a1ed PX |
3689 | kvm_dirty_ring_free(&vcpu->dirty_ring); |
3690 | arch_vcpu_destroy: | |
d40ccc62 | 3691 | kvm_arch_vcpu_destroy(vcpu); |
8bd826d6 SC |
3692 | vcpu_free_run_page: |
3693 | free_page((unsigned long)vcpu->run); | |
e529ef66 SC |
3694 | vcpu_free: |
3695 | kmem_cache_free(kvm_vcpu_cache, vcpu); | |
6c7caebc PB |
3696 | vcpu_decrement: |
3697 | mutex_lock(&kvm->lock); | |
3698 | kvm->created_vcpus--; | |
3699 | mutex_unlock(&kvm->lock); | |
c5ea7660 AK |
3700 | return r; |
3701 | } | |
3702 | ||
1961d276 AK |
3703 | static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu *vcpu, sigset_t *sigset) |
3704 | { | |
3705 | if (sigset) { | |
3706 | sigdelsetmask(sigset, sigmask(SIGKILL)|sigmask(SIGSTOP)); | |
3707 | vcpu->sigset_active = 1; | |
3708 | vcpu->sigset = *sigset; | |
3709 | } else | |
3710 | vcpu->sigset_active = 0; | |
3711 | return 0; | |
3712 | } | |
3713 | ||
ce55c049 JZ |
3714 | static ssize_t kvm_vcpu_stats_read(struct file *file, char __user *user_buffer, |
3715 | size_t size, loff_t *offset) | |
3716 | { | |
3717 | struct kvm_vcpu *vcpu = file->private_data; | |
3718 | ||
3719 | return kvm_stats_read(vcpu->stats_id, &kvm_vcpu_stats_header, | |
3720 | &kvm_vcpu_stats_desc[0], &vcpu->stat, | |
3721 | sizeof(vcpu->stat), user_buffer, size, offset); | |
3722 | } | |
3723 | ||
3724 | static const struct file_operations kvm_vcpu_stats_fops = { | |
3725 | .read = kvm_vcpu_stats_read, | |
3726 | .llseek = noop_llseek, | |
3727 | }; | |
3728 | ||
3729 | static int kvm_vcpu_ioctl_get_stats_fd(struct kvm_vcpu *vcpu) | |
3730 | { | |
3731 | int fd; | |
3732 | struct file *file; | |
3733 | char name[15 + ITOA_MAX_LEN + 1]; | |
3734 | ||
3735 | snprintf(name, sizeof(name), "kvm-vcpu-stats:%d", vcpu->vcpu_id); | |
3736 | ||
3737 | fd = get_unused_fd_flags(O_CLOEXEC); | |
3738 | if (fd < 0) | |
3739 | return fd; | |
3740 | ||
3741 | file = anon_inode_getfile(name, &kvm_vcpu_stats_fops, vcpu, O_RDONLY); | |
3742 | if (IS_ERR(file)) { | |
3743 | put_unused_fd(fd); | |
3744 | return PTR_ERR(file); | |
3745 | } | |
3746 | file->f_mode |= FMODE_PREAD; | |
3747 | fd_install(fd, file); | |
3748 | ||
3749 | return fd; | |
3750 | } | |
3751 | ||
bccf2150 AK |
3752 | static long kvm_vcpu_ioctl(struct file *filp, |
3753 | unsigned int ioctl, unsigned long arg) | |
6aa8b732 | 3754 | { |
bccf2150 | 3755 | struct kvm_vcpu *vcpu = filp->private_data; |
2f366987 | 3756 | void __user *argp = (void __user *)arg; |
313a3dc7 | 3757 | int r; |
fa3795a7 DH |
3758 | struct kvm_fpu *fpu = NULL; |
3759 | struct kvm_sregs *kvm_sregs = NULL; | |
6aa8b732 | 3760 | |
0b8f1173 | 3761 | if (vcpu->kvm->mm != current->mm || vcpu->kvm->vm_bugged) |
6d4e4c4f | 3762 | return -EIO; |
2122ff5e | 3763 | |
2ea75be3 DM |
3764 | if (unlikely(_IOC_TYPE(ioctl) != KVMIO)) |
3765 | return -EINVAL; | |
3766 | ||
2122ff5e | 3767 | /* |
5cb0944c PB |
3768 | * Some architectures have vcpu ioctls that are asynchronous to vcpu |
3769 | * execution; mutex_lock() would break them. | |
2122ff5e | 3770 | */ |
5cb0944c PB |
3771 | r = kvm_arch_vcpu_async_ioctl(filp, ioctl, arg); |
3772 | if (r != -ENOIOCTLCMD) | |
9fc77441 | 3773 | return r; |
2122ff5e | 3774 | |
ec7660cc CD |
3775 | if (mutex_lock_killable(&vcpu->mutex)) |
3776 | return -EINTR; | |
6aa8b732 | 3777 | switch (ioctl) { |
0e4524a5 CB |
3778 | case KVM_RUN: { |
3779 | struct pid *oldpid; | |
f0fe5108 AK |
3780 | r = -EINVAL; |
3781 | if (arg) | |
3782 | goto out; | |
0e4524a5 | 3783 | oldpid = rcu_access_pointer(vcpu->pid); |
71dbc8a9 | 3784 | if (unlikely(oldpid != task_pid(current))) { |
7a72f7a1 | 3785 | /* The thread running this VCPU changed. */ |
bd2a6394 | 3786 | struct pid *newpid; |
f95ef0cd | 3787 | |
bd2a6394 CD |
3788 | r = kvm_arch_vcpu_run_pid_change(vcpu); |
3789 | if (r) | |
3790 | break; | |
3791 | ||
3792 | newpid = get_task_pid(current, PIDTYPE_PID); | |
7a72f7a1 CB |
3793 | rcu_assign_pointer(vcpu->pid, newpid); |
3794 | if (oldpid) | |
3795 | synchronize_rcu(); | |
3796 | put_pid(oldpid); | |
3797 | } | |
1b94f6f8 | 3798 | r = kvm_arch_vcpu_ioctl_run(vcpu); |
64be5007 | 3799 | trace_kvm_userspace_exit(vcpu->run->exit_reason, r); |
6aa8b732 | 3800 | break; |
0e4524a5 | 3801 | } |
6aa8b732 | 3802 | case KVM_GET_REGS: { |
3e4bb3ac | 3803 | struct kvm_regs *kvm_regs; |
6aa8b732 | 3804 | |
3e4bb3ac | 3805 | r = -ENOMEM; |
b12ce36a | 3806 | kvm_regs = kzalloc(sizeof(struct kvm_regs), GFP_KERNEL_ACCOUNT); |
3e4bb3ac | 3807 | if (!kvm_regs) |
6aa8b732 | 3808 | goto out; |
3e4bb3ac XZ |
3809 | r = kvm_arch_vcpu_ioctl_get_regs(vcpu, kvm_regs); |
3810 | if (r) | |
3811 | goto out_free1; | |
6aa8b732 | 3812 | r = -EFAULT; |
3e4bb3ac XZ |
3813 | if (copy_to_user(argp, kvm_regs, sizeof(struct kvm_regs))) |
3814 | goto out_free1; | |
6aa8b732 | 3815 | r = 0; |
3e4bb3ac XZ |
3816 | out_free1: |
3817 | kfree(kvm_regs); | |
6aa8b732 AK |
3818 | break; |
3819 | } | |
3820 | case KVM_SET_REGS: { | |
3e4bb3ac | 3821 | struct kvm_regs *kvm_regs; |
6aa8b732 | 3822 | |
ff5c2c03 SL |
3823 | kvm_regs = memdup_user(argp, sizeof(*kvm_regs)); |
3824 | if (IS_ERR(kvm_regs)) { | |
3825 | r = PTR_ERR(kvm_regs); | |
6aa8b732 | 3826 | goto out; |
ff5c2c03 | 3827 | } |
3e4bb3ac | 3828 | r = kvm_arch_vcpu_ioctl_set_regs(vcpu, kvm_regs); |
3e4bb3ac | 3829 | kfree(kvm_regs); |
6aa8b732 AK |
3830 | break; |
3831 | } | |
3832 | case KVM_GET_SREGS: { | |
b12ce36a BG |
3833 | kvm_sregs = kzalloc(sizeof(struct kvm_sregs), |
3834 | GFP_KERNEL_ACCOUNT); | |
fa3795a7 DH |
3835 | r = -ENOMEM; |
3836 | if (!kvm_sregs) | |
3837 | goto out; | |
3838 | r = kvm_arch_vcpu_ioctl_get_sregs(vcpu, kvm_sregs); | |
6aa8b732 AK |
3839 | if (r) |
3840 | goto out; | |
3841 | r = -EFAULT; | |
fa3795a7 | 3842 | if (copy_to_user(argp, kvm_sregs, sizeof(struct kvm_sregs))) |
6aa8b732 AK |
3843 | goto out; |
3844 | r = 0; | |
3845 | break; | |
3846 | } | |
3847 | case KVM_SET_SREGS: { | |
ff5c2c03 SL |
3848 | kvm_sregs = memdup_user(argp, sizeof(*kvm_sregs)); |
3849 | if (IS_ERR(kvm_sregs)) { | |
3850 | r = PTR_ERR(kvm_sregs); | |
18595411 | 3851 | kvm_sregs = NULL; |
6aa8b732 | 3852 | goto out; |
ff5c2c03 | 3853 | } |
fa3795a7 | 3854 | r = kvm_arch_vcpu_ioctl_set_sregs(vcpu, kvm_sregs); |
6aa8b732 AK |
3855 | break; |
3856 | } | |
62d9f0db MT |
3857 | case KVM_GET_MP_STATE: { |
3858 | struct kvm_mp_state mp_state; | |
3859 | ||
3860 | r = kvm_arch_vcpu_ioctl_get_mpstate(vcpu, &mp_state); | |
3861 | if (r) | |
3862 | goto out; | |
3863 | r = -EFAULT; | |
893bdbf1 | 3864 | if (copy_to_user(argp, &mp_state, sizeof(mp_state))) |
62d9f0db MT |
3865 | goto out; |
3866 | r = 0; | |
3867 | break; | |
3868 | } | |
3869 | case KVM_SET_MP_STATE: { | |
3870 | struct kvm_mp_state mp_state; | |
3871 | ||
3872 | r = -EFAULT; | |
893bdbf1 | 3873 | if (copy_from_user(&mp_state, argp, sizeof(mp_state))) |
62d9f0db MT |
3874 | goto out; |
3875 | r = kvm_arch_vcpu_ioctl_set_mpstate(vcpu, &mp_state); | |
62d9f0db MT |
3876 | break; |
3877 | } | |
6aa8b732 AK |
3878 | case KVM_TRANSLATE: { |
3879 | struct kvm_translation tr; | |
3880 | ||
3881 | r = -EFAULT; | |
893bdbf1 | 3882 | if (copy_from_user(&tr, argp, sizeof(tr))) |
6aa8b732 | 3883 | goto out; |
8b006791 | 3884 | r = kvm_arch_vcpu_ioctl_translate(vcpu, &tr); |
6aa8b732 AK |
3885 | if (r) |
3886 | goto out; | |
3887 | r = -EFAULT; | |
893bdbf1 | 3888 | if (copy_to_user(argp, &tr, sizeof(tr))) |
6aa8b732 AK |
3889 | goto out; |
3890 | r = 0; | |
3891 | break; | |
3892 | } | |
d0bfb940 JK |
3893 | case KVM_SET_GUEST_DEBUG: { |
3894 | struct kvm_guest_debug dbg; | |
6aa8b732 AK |
3895 | |
3896 | r = -EFAULT; | |
893bdbf1 | 3897 | if (copy_from_user(&dbg, argp, sizeof(dbg))) |
6aa8b732 | 3898 | goto out; |
d0bfb940 | 3899 | r = kvm_arch_vcpu_ioctl_set_guest_debug(vcpu, &dbg); |
6aa8b732 AK |
3900 | break; |
3901 | } | |
1961d276 AK |
3902 | case KVM_SET_SIGNAL_MASK: { |
3903 | struct kvm_signal_mask __user *sigmask_arg = argp; | |
3904 | struct kvm_signal_mask kvm_sigmask; | |
3905 | sigset_t sigset, *p; | |
3906 | ||
3907 | p = NULL; | |
3908 | if (argp) { | |
3909 | r = -EFAULT; | |
3910 | if (copy_from_user(&kvm_sigmask, argp, | |
893bdbf1 | 3911 | sizeof(kvm_sigmask))) |
1961d276 AK |
3912 | goto out; |
3913 | r = -EINVAL; | |
893bdbf1 | 3914 | if (kvm_sigmask.len != sizeof(sigset)) |
1961d276 AK |
3915 | goto out; |
3916 | r = -EFAULT; | |
3917 | if (copy_from_user(&sigset, sigmask_arg->sigset, | |
893bdbf1 | 3918 | sizeof(sigset))) |
1961d276 AK |
3919 | goto out; |
3920 | p = &sigset; | |
3921 | } | |
376d41ff | 3922 | r = kvm_vcpu_ioctl_set_sigmask(vcpu, p); |
1961d276 AK |
3923 | break; |
3924 | } | |
b8836737 | 3925 | case KVM_GET_FPU: { |
b12ce36a | 3926 | fpu = kzalloc(sizeof(struct kvm_fpu), GFP_KERNEL_ACCOUNT); |
fa3795a7 DH |
3927 | r = -ENOMEM; |
3928 | if (!fpu) | |
3929 | goto out; | |
3930 | r = kvm_arch_vcpu_ioctl_get_fpu(vcpu, fpu); | |
b8836737 AK |
3931 | if (r) |
3932 | goto out; | |
3933 | r = -EFAULT; | |
fa3795a7 | 3934 | if (copy_to_user(argp, fpu, sizeof(struct kvm_fpu))) |
b8836737 AK |
3935 | goto out; |
3936 | r = 0; | |
3937 | break; | |
3938 | } | |
3939 | case KVM_SET_FPU: { | |
ff5c2c03 SL |
3940 | fpu = memdup_user(argp, sizeof(*fpu)); |
3941 | if (IS_ERR(fpu)) { | |
3942 | r = PTR_ERR(fpu); | |
18595411 | 3943 | fpu = NULL; |
b8836737 | 3944 | goto out; |
ff5c2c03 | 3945 | } |
fa3795a7 | 3946 | r = kvm_arch_vcpu_ioctl_set_fpu(vcpu, fpu); |
b8836737 AK |
3947 | break; |
3948 | } | |
ce55c049 JZ |
3949 | case KVM_GET_STATS_FD: { |
3950 | r = kvm_vcpu_ioctl_get_stats_fd(vcpu); | |
3951 | break; | |
3952 | } | |
bccf2150 | 3953 | default: |
313a3dc7 | 3954 | r = kvm_arch_vcpu_ioctl(filp, ioctl, arg); |
bccf2150 AK |
3955 | } |
3956 | out: | |
ec7660cc | 3957 | mutex_unlock(&vcpu->mutex); |
fa3795a7 DH |
3958 | kfree(fpu); |
3959 | kfree(kvm_sregs); | |
bccf2150 AK |
3960 | return r; |
3961 | } | |
3962 | ||
de8e5d74 | 3963 | #ifdef CONFIG_KVM_COMPAT |
1dda606c AG |
3964 | static long kvm_vcpu_compat_ioctl(struct file *filp, |
3965 | unsigned int ioctl, unsigned long arg) | |
3966 | { | |
3967 | struct kvm_vcpu *vcpu = filp->private_data; | |
3968 | void __user *argp = compat_ptr(arg); | |
3969 | int r; | |
3970 | ||
0b8f1173 | 3971 | if (vcpu->kvm->mm != current->mm || vcpu->kvm->vm_bugged) |
1dda606c AG |
3972 | return -EIO; |
3973 | ||
3974 | switch (ioctl) { | |
3975 | case KVM_SET_SIGNAL_MASK: { | |
3976 | struct kvm_signal_mask __user *sigmask_arg = argp; | |
3977 | struct kvm_signal_mask kvm_sigmask; | |
1dda606c AG |
3978 | sigset_t sigset; |
3979 | ||
3980 | if (argp) { | |
3981 | r = -EFAULT; | |
3982 | if (copy_from_user(&kvm_sigmask, argp, | |
893bdbf1 | 3983 | sizeof(kvm_sigmask))) |
1dda606c AG |
3984 | goto out; |
3985 | r = -EINVAL; | |
3968cf62 | 3986 | if (kvm_sigmask.len != sizeof(compat_sigset_t)) |
1dda606c AG |
3987 | goto out; |
3988 | r = -EFAULT; | |
1393b4aa PB |
3989 | if (get_compat_sigset(&sigset, |
3990 | (compat_sigset_t __user *)sigmask_arg->sigset)) | |
1dda606c | 3991 | goto out; |
760a9a30 AC |
3992 | r = kvm_vcpu_ioctl_set_sigmask(vcpu, &sigset); |
3993 | } else | |
3994 | r = kvm_vcpu_ioctl_set_sigmask(vcpu, NULL); | |
1dda606c AG |
3995 | break; |
3996 | } | |
3997 | default: | |
3998 | r = kvm_vcpu_ioctl(filp, ioctl, arg); | |
3999 | } | |
4000 | ||
4001 | out: | |
4002 | return r; | |
4003 | } | |
4004 | #endif | |
4005 | ||
a1cd3f08 CLG |
4006 | static int kvm_device_mmap(struct file *filp, struct vm_area_struct *vma) |
4007 | { | |
4008 | struct kvm_device *dev = filp->private_data; | |
4009 | ||
4010 | if (dev->ops->mmap) | |
4011 | return dev->ops->mmap(dev, vma); | |
4012 | ||
4013 | return -ENODEV; | |
4014 | } | |
4015 | ||
852b6d57 SW |
4016 | static int kvm_device_ioctl_attr(struct kvm_device *dev, |
4017 | int (*accessor)(struct kvm_device *dev, | |
4018 | struct kvm_device_attr *attr), | |
4019 | unsigned long arg) | |
4020 | { | |
4021 | struct kvm_device_attr attr; | |
4022 | ||
4023 | if (!accessor) | |
4024 | return -EPERM; | |
4025 | ||
4026 | if (copy_from_user(&attr, (void __user *)arg, sizeof(attr))) | |
4027 | return -EFAULT; | |
4028 | ||
4029 | return accessor(dev, &attr); | |
4030 | } | |
4031 | ||
4032 | static long kvm_device_ioctl(struct file *filp, unsigned int ioctl, | |
4033 | unsigned long arg) | |
4034 | { | |
4035 | struct kvm_device *dev = filp->private_data; | |
4036 | ||
0b8f1173 | 4037 | if (dev->kvm->mm != current->mm || dev->kvm->vm_bugged) |
ddba9180 SC |
4038 | return -EIO; |
4039 | ||
852b6d57 SW |
4040 | switch (ioctl) { |
4041 | case KVM_SET_DEVICE_ATTR: | |
4042 | return kvm_device_ioctl_attr(dev, dev->ops->set_attr, arg); | |
4043 | case KVM_GET_DEVICE_ATTR: | |
4044 | return kvm_device_ioctl_attr(dev, dev->ops->get_attr, arg); | |
4045 | case KVM_HAS_DEVICE_ATTR: | |
4046 | return kvm_device_ioctl_attr(dev, dev->ops->has_attr, arg); | |
4047 | default: | |
4048 | if (dev->ops->ioctl) | |
4049 | return dev->ops->ioctl(dev, ioctl, arg); | |
4050 | ||
4051 | return -ENOTTY; | |
4052 | } | |
4053 | } | |
4054 | ||
852b6d57 SW |
4055 | static int kvm_device_release(struct inode *inode, struct file *filp) |
4056 | { | |
4057 | struct kvm_device *dev = filp->private_data; | |
4058 | struct kvm *kvm = dev->kvm; | |
4059 | ||
2bde9b3e CLG |
4060 | if (dev->ops->release) { |
4061 | mutex_lock(&kvm->lock); | |
4062 | list_del(&dev->vm_node); | |
4063 | dev->ops->release(dev); | |
4064 | mutex_unlock(&kvm->lock); | |
4065 | } | |
4066 | ||
852b6d57 SW |
4067 | kvm_put_kvm(kvm); |
4068 | return 0; | |
4069 | } | |
4070 | ||
4071 | static const struct file_operations kvm_device_fops = { | |
4072 | .unlocked_ioctl = kvm_device_ioctl, | |
4073 | .release = kvm_device_release, | |
7ddfd3e0 | 4074 | KVM_COMPAT(kvm_device_ioctl), |
a1cd3f08 | 4075 | .mmap = kvm_device_mmap, |
852b6d57 SW |
4076 | }; |
4077 | ||
4078 | struct kvm_device *kvm_device_from_filp(struct file *filp) | |
4079 | { | |
4080 | if (filp->f_op != &kvm_device_fops) | |
4081 | return NULL; | |
4082 | ||
4083 | return filp->private_data; | |
4084 | } | |
4085 | ||
8538cb22 | 4086 | static const struct kvm_device_ops *kvm_device_ops_table[KVM_DEV_TYPE_MAX] = { |
5df554ad | 4087 | #ifdef CONFIG_KVM_MPIC |
d60eacb0 WD |
4088 | [KVM_DEV_TYPE_FSL_MPIC_20] = &kvm_mpic_ops, |
4089 | [KVM_DEV_TYPE_FSL_MPIC_42] = &kvm_mpic_ops, | |
5975a2e0 | 4090 | #endif |
d60eacb0 WD |
4091 | }; |
4092 | ||
8538cb22 | 4093 | int kvm_register_device_ops(const struct kvm_device_ops *ops, u32 type) |
d60eacb0 WD |
4094 | { |
4095 | if (type >= ARRAY_SIZE(kvm_device_ops_table)) | |
4096 | return -ENOSPC; | |
4097 | ||
4098 | if (kvm_device_ops_table[type] != NULL) | |
4099 | return -EEXIST; | |
4100 | ||
4101 | kvm_device_ops_table[type] = ops; | |
4102 | return 0; | |
4103 | } | |
4104 | ||
571ee1b6 WL |
4105 | void kvm_unregister_device_ops(u32 type) |
4106 | { | |
4107 | if (kvm_device_ops_table[type] != NULL) | |
4108 | kvm_device_ops_table[type] = NULL; | |
4109 | } | |
4110 | ||
852b6d57 SW |
4111 | static int kvm_ioctl_create_device(struct kvm *kvm, |
4112 | struct kvm_create_device *cd) | |
4113 | { | |
8538cb22 | 4114 | const struct kvm_device_ops *ops = NULL; |
852b6d57 SW |
4115 | struct kvm_device *dev; |
4116 | bool test = cd->flags & KVM_CREATE_DEVICE_TEST; | |
1d487e9b | 4117 | int type; |
852b6d57 SW |
4118 | int ret; |
4119 | ||
d60eacb0 WD |
4120 | if (cd->type >= ARRAY_SIZE(kvm_device_ops_table)) |
4121 | return -ENODEV; | |
4122 | ||
1d487e9b PB |
4123 | type = array_index_nospec(cd->type, ARRAY_SIZE(kvm_device_ops_table)); |
4124 | ops = kvm_device_ops_table[type]; | |
d60eacb0 | 4125 | if (ops == NULL) |
852b6d57 | 4126 | return -ENODEV; |
852b6d57 SW |
4127 | |
4128 | if (test) | |
4129 | return 0; | |
4130 | ||
b12ce36a | 4131 | dev = kzalloc(sizeof(*dev), GFP_KERNEL_ACCOUNT); |
852b6d57 SW |
4132 | if (!dev) |
4133 | return -ENOMEM; | |
4134 | ||
4135 | dev->ops = ops; | |
4136 | dev->kvm = kvm; | |
852b6d57 | 4137 | |
a28ebea2 | 4138 | mutex_lock(&kvm->lock); |
1d487e9b | 4139 | ret = ops->create(dev, type); |
852b6d57 | 4140 | if (ret < 0) { |
a28ebea2 | 4141 | mutex_unlock(&kvm->lock); |
852b6d57 SW |
4142 | kfree(dev); |
4143 | return ret; | |
4144 | } | |
a28ebea2 CD |
4145 | list_add(&dev->vm_node, &kvm->devices); |
4146 | mutex_unlock(&kvm->lock); | |
852b6d57 | 4147 | |
023e9fdd CD |
4148 | if (ops->init) |
4149 | ops->init(dev); | |
4150 | ||
cfa39381 | 4151 | kvm_get_kvm(kvm); |
24009b05 | 4152 | ret = anon_inode_getfd(ops->name, &kvm_device_fops, dev, O_RDWR | O_CLOEXEC); |
852b6d57 | 4153 | if (ret < 0) { |
149487bd | 4154 | kvm_put_kvm_no_destroy(kvm); |
a28ebea2 CD |
4155 | mutex_lock(&kvm->lock); |
4156 | list_del(&dev->vm_node); | |
4157 | mutex_unlock(&kvm->lock); | |
a0f1d21c | 4158 | ops->destroy(dev); |
852b6d57 SW |
4159 | return ret; |
4160 | } | |
4161 | ||
852b6d57 SW |
4162 | cd->fd = ret; |
4163 | return 0; | |
4164 | } | |
4165 | ||
92b591a4 AG |
4166 | static long kvm_vm_ioctl_check_extension_generic(struct kvm *kvm, long arg) |
4167 | { | |
4168 | switch (arg) { | |
4169 | case KVM_CAP_USER_MEMORY: | |
4170 | case KVM_CAP_DESTROY_MEMORY_REGION_WORKS: | |
4171 | case KVM_CAP_JOIN_MEMORY_REGIONS_WORKS: | |
92b591a4 AG |
4172 | case KVM_CAP_INTERNAL_ERROR_DATA: |
4173 | #ifdef CONFIG_HAVE_KVM_MSI | |
4174 | case KVM_CAP_SIGNAL_MSI: | |
4175 | #endif | |
297e2105 | 4176 | #ifdef CONFIG_HAVE_KVM_IRQFD |
dc9be0fa | 4177 | case KVM_CAP_IRQFD: |
92b591a4 AG |
4178 | case KVM_CAP_IRQFD_RESAMPLE: |
4179 | #endif | |
e9ea5069 | 4180 | case KVM_CAP_IOEVENTFD_ANY_LENGTH: |
92b591a4 | 4181 | case KVM_CAP_CHECK_EXTENSION_VM: |
e5d83c74 | 4182 | case KVM_CAP_ENABLE_CAP_VM: |
acd05785 | 4183 | case KVM_CAP_HALT_POLL: |
92b591a4 | 4184 | return 1; |
4b4357e0 | 4185 | #ifdef CONFIG_KVM_MMIO |
30422558 PB |
4186 | case KVM_CAP_COALESCED_MMIO: |
4187 | return KVM_COALESCED_MMIO_PAGE_OFFSET; | |
0804c849 PH |
4188 | case KVM_CAP_COALESCED_PIO: |
4189 | return 1; | |
30422558 | 4190 | #endif |
3c9bd400 JZ |
4191 | #ifdef CONFIG_KVM_GENERIC_DIRTYLOG_READ_PROTECT |
4192 | case KVM_CAP_MANUAL_DIRTY_LOG_PROTECT2: | |
4193 | return KVM_DIRTY_LOG_MANUAL_CAPS; | |
4194 | #endif | |
92b591a4 AG |
4195 | #ifdef CONFIG_HAVE_KVM_IRQ_ROUTING |
4196 | case KVM_CAP_IRQ_ROUTING: | |
4197 | return KVM_MAX_IRQ_ROUTES; | |
f481b069 PB |
4198 | #endif |
4199 | #if KVM_ADDRESS_SPACE_NUM > 1 | |
4200 | case KVM_CAP_MULTI_ADDRESS_SPACE: | |
4201 | return KVM_ADDRESS_SPACE_NUM; | |
92b591a4 | 4202 | #endif |
c110ae57 PB |
4203 | case KVM_CAP_NR_MEMSLOTS: |
4204 | return KVM_USER_MEM_SLOTS; | |
fb04a1ed PX |
4205 | case KVM_CAP_DIRTY_LOG_RING: |
4206 | #if KVM_DIRTY_LOG_PAGE_OFFSET > 0 | |
4207 | return KVM_DIRTY_RING_MAX_ENTRIES * sizeof(struct kvm_dirty_gfn); | |
4208 | #else | |
4209 | return 0; | |
4210 | #endif | |
ce55c049 JZ |
4211 | case KVM_CAP_BINARY_STATS_FD: |
4212 | return 1; | |
92b591a4 AG |
4213 | default: |
4214 | break; | |
4215 | } | |
4216 | return kvm_vm_ioctl_check_extension(kvm, arg); | |
4217 | } | |
4218 | ||
fb04a1ed PX |
4219 | static int kvm_vm_ioctl_enable_dirty_log_ring(struct kvm *kvm, u32 size) |
4220 | { | |
4221 | int r; | |
4222 | ||
4223 | if (!KVM_DIRTY_LOG_PAGE_OFFSET) | |
4224 | return -EINVAL; | |
4225 | ||
4226 | /* the size should be power of 2 */ | |
4227 | if (!size || (size & (size - 1))) | |
4228 | return -EINVAL; | |
4229 | ||
4230 | /* Should be bigger to keep the reserved entries, or a page */ | |
4231 | if (size < kvm_dirty_ring_get_rsvd_entries() * | |
4232 | sizeof(struct kvm_dirty_gfn) || size < PAGE_SIZE) | |
4233 | return -EINVAL; | |
4234 | ||
4235 | if (size > KVM_DIRTY_RING_MAX_ENTRIES * | |
4236 | sizeof(struct kvm_dirty_gfn)) | |
4237 | return -E2BIG; | |
4238 | ||
4239 | /* We only allow it to set once */ | |
4240 | if (kvm->dirty_ring_size) | |
4241 | return -EINVAL; | |
4242 | ||
4243 | mutex_lock(&kvm->lock); | |
4244 | ||
4245 | if (kvm->created_vcpus) { | |
4246 | /* We don't allow to change this value after vcpu created */ | |
4247 | r = -EINVAL; | |
4248 | } else { | |
4249 | kvm->dirty_ring_size = size; | |
4250 | r = 0; | |
4251 | } | |
4252 | ||
4253 | mutex_unlock(&kvm->lock); | |
4254 | return r; | |
4255 | } | |
4256 | ||
4257 | static int kvm_vm_ioctl_reset_dirty_pages(struct kvm *kvm) | |
4258 | { | |
4259 | int i; | |
4260 | struct kvm_vcpu *vcpu; | |
4261 | int cleared = 0; | |
4262 | ||
4263 | if (!kvm->dirty_ring_size) | |
4264 | return -EINVAL; | |
4265 | ||
4266 | mutex_lock(&kvm->slots_lock); | |
4267 | ||
4268 | kvm_for_each_vcpu(i, vcpu, kvm) | |
4269 | cleared += kvm_dirty_ring_reset(vcpu->kvm, &vcpu->dirty_ring); | |
4270 | ||
4271 | mutex_unlock(&kvm->slots_lock); | |
4272 | ||
4273 | if (cleared) | |
4274 | kvm_flush_remote_tlbs(kvm); | |
4275 | ||
4276 | return cleared; | |
4277 | } | |
4278 | ||
e5d83c74 PB |
4279 | int __attribute__((weak)) kvm_vm_ioctl_enable_cap(struct kvm *kvm, |
4280 | struct kvm_enable_cap *cap) | |
4281 | { | |
4282 | return -EINVAL; | |
4283 | } | |
4284 | ||
4285 | static int kvm_vm_ioctl_enable_cap_generic(struct kvm *kvm, | |
4286 | struct kvm_enable_cap *cap) | |
4287 | { | |
4288 | switch (cap->cap) { | |
2a31b9db | 4289 | #ifdef CONFIG_KVM_GENERIC_DIRTYLOG_READ_PROTECT |
3c9bd400 JZ |
4290 | case KVM_CAP_MANUAL_DIRTY_LOG_PROTECT2: { |
4291 | u64 allowed_options = KVM_DIRTY_LOG_MANUAL_PROTECT_ENABLE; | |
4292 | ||
4293 | if (cap->args[0] & KVM_DIRTY_LOG_MANUAL_PROTECT_ENABLE) | |
4294 | allowed_options = KVM_DIRTY_LOG_MANUAL_CAPS; | |
4295 | ||
4296 | if (cap->flags || (cap->args[0] & ~allowed_options)) | |
2a31b9db PB |
4297 | return -EINVAL; |
4298 | kvm->manual_dirty_log_protect = cap->args[0]; | |
4299 | return 0; | |
3c9bd400 | 4300 | } |
2a31b9db | 4301 | #endif |
acd05785 DM |
4302 | case KVM_CAP_HALT_POLL: { |
4303 | if (cap->flags || cap->args[0] != (unsigned int)cap->args[0]) | |
4304 | return -EINVAL; | |
4305 | ||
4306 | kvm->max_halt_poll_ns = cap->args[0]; | |
4307 | return 0; | |
4308 | } | |
fb04a1ed PX |
4309 | case KVM_CAP_DIRTY_LOG_RING: |
4310 | return kvm_vm_ioctl_enable_dirty_log_ring(kvm, cap->args[0]); | |
e5d83c74 PB |
4311 | default: |
4312 | return kvm_vm_ioctl_enable_cap(kvm, cap); | |
4313 | } | |
4314 | } | |
4315 | ||
fcfe1bae JZ |
4316 | static ssize_t kvm_vm_stats_read(struct file *file, char __user *user_buffer, |
4317 | size_t size, loff_t *offset) | |
4318 | { | |
4319 | struct kvm *kvm = file->private_data; | |
4320 | ||
4321 | return kvm_stats_read(kvm->stats_id, &kvm_vm_stats_header, | |
4322 | &kvm_vm_stats_desc[0], &kvm->stat, | |
4323 | sizeof(kvm->stat), user_buffer, size, offset); | |
4324 | } | |
4325 | ||
4326 | static const struct file_operations kvm_vm_stats_fops = { | |
4327 | .read = kvm_vm_stats_read, | |
4328 | .llseek = noop_llseek, | |
4329 | }; | |
4330 | ||
4331 | static int kvm_vm_ioctl_get_stats_fd(struct kvm *kvm) | |
4332 | { | |
4333 | int fd; | |
4334 | struct file *file; | |
4335 | ||
4336 | fd = get_unused_fd_flags(O_CLOEXEC); | |
4337 | if (fd < 0) | |
4338 | return fd; | |
4339 | ||
4340 | file = anon_inode_getfile("kvm-vm-stats", | |
4341 | &kvm_vm_stats_fops, kvm, O_RDONLY); | |
4342 | if (IS_ERR(file)) { | |
4343 | put_unused_fd(fd); | |
4344 | return PTR_ERR(file); | |
4345 | } | |
4346 | file->f_mode |= FMODE_PREAD; | |
4347 | fd_install(fd, file); | |
4348 | ||
4349 | return fd; | |
4350 | } | |
4351 | ||
bccf2150 AK |
4352 | static long kvm_vm_ioctl(struct file *filp, |
4353 | unsigned int ioctl, unsigned long arg) | |
4354 | { | |
4355 | struct kvm *kvm = filp->private_data; | |
4356 | void __user *argp = (void __user *)arg; | |
1fe779f8 | 4357 | int r; |
bccf2150 | 4358 | |
0b8f1173 | 4359 | if (kvm->mm != current->mm || kvm->vm_bugged) |
6d4e4c4f | 4360 | return -EIO; |
bccf2150 AK |
4361 | switch (ioctl) { |
4362 | case KVM_CREATE_VCPU: | |
4363 | r = kvm_vm_ioctl_create_vcpu(kvm, arg); | |
bccf2150 | 4364 | break; |
e5d83c74 PB |
4365 | case KVM_ENABLE_CAP: { |
4366 | struct kvm_enable_cap cap; | |
4367 | ||
4368 | r = -EFAULT; | |
4369 | if (copy_from_user(&cap, argp, sizeof(cap))) | |
4370 | goto out; | |
4371 | r = kvm_vm_ioctl_enable_cap_generic(kvm, &cap); | |
4372 | break; | |
4373 | } | |
6fc138d2 IE |
4374 | case KVM_SET_USER_MEMORY_REGION: { |
4375 | struct kvm_userspace_memory_region kvm_userspace_mem; | |
4376 | ||
4377 | r = -EFAULT; | |
4378 | if (copy_from_user(&kvm_userspace_mem, argp, | |
893bdbf1 | 4379 | sizeof(kvm_userspace_mem))) |
6fc138d2 IE |
4380 | goto out; |
4381 | ||
47ae31e2 | 4382 | r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_userspace_mem); |
6aa8b732 AK |
4383 | break; |
4384 | } | |
4385 | case KVM_GET_DIRTY_LOG: { | |
4386 | struct kvm_dirty_log log; | |
4387 | ||
4388 | r = -EFAULT; | |
893bdbf1 | 4389 | if (copy_from_user(&log, argp, sizeof(log))) |
6aa8b732 | 4390 | goto out; |
2c6f5df9 | 4391 | r = kvm_vm_ioctl_get_dirty_log(kvm, &log); |
6aa8b732 AK |
4392 | break; |
4393 | } | |
2a31b9db PB |
4394 | #ifdef CONFIG_KVM_GENERIC_DIRTYLOG_READ_PROTECT |
4395 | case KVM_CLEAR_DIRTY_LOG: { | |
4396 | struct kvm_clear_dirty_log log; | |
4397 | ||
4398 | r = -EFAULT; | |
4399 | if (copy_from_user(&log, argp, sizeof(log))) | |
4400 | goto out; | |
4401 | r = kvm_vm_ioctl_clear_dirty_log(kvm, &log); | |
4402 | break; | |
4403 | } | |
4404 | #endif | |
4b4357e0 | 4405 | #ifdef CONFIG_KVM_MMIO |
5f94c174 LV |
4406 | case KVM_REGISTER_COALESCED_MMIO: { |
4407 | struct kvm_coalesced_mmio_zone zone; | |
f95ef0cd | 4408 | |
5f94c174 | 4409 | r = -EFAULT; |
893bdbf1 | 4410 | if (copy_from_user(&zone, argp, sizeof(zone))) |
5f94c174 | 4411 | goto out; |
5f94c174 | 4412 | r = kvm_vm_ioctl_register_coalesced_mmio(kvm, &zone); |
5f94c174 LV |
4413 | break; |
4414 | } | |
4415 | case KVM_UNREGISTER_COALESCED_MMIO: { | |
4416 | struct kvm_coalesced_mmio_zone zone; | |
f95ef0cd | 4417 | |
5f94c174 | 4418 | r = -EFAULT; |
893bdbf1 | 4419 | if (copy_from_user(&zone, argp, sizeof(zone))) |
5f94c174 | 4420 | goto out; |
5f94c174 | 4421 | r = kvm_vm_ioctl_unregister_coalesced_mmio(kvm, &zone); |
5f94c174 LV |
4422 | break; |
4423 | } | |
4424 | #endif | |
721eecbf GH |
4425 | case KVM_IRQFD: { |
4426 | struct kvm_irqfd data; | |
4427 | ||
4428 | r = -EFAULT; | |
893bdbf1 | 4429 | if (copy_from_user(&data, argp, sizeof(data))) |
721eecbf | 4430 | goto out; |
d4db2935 | 4431 | r = kvm_irqfd(kvm, &data); |
721eecbf GH |
4432 | break; |
4433 | } | |
d34e6b17 GH |
4434 | case KVM_IOEVENTFD: { |
4435 | struct kvm_ioeventfd data; | |
4436 | ||
4437 | r = -EFAULT; | |
893bdbf1 | 4438 | if (copy_from_user(&data, argp, sizeof(data))) |
d34e6b17 GH |
4439 | goto out; |
4440 | r = kvm_ioeventfd(kvm, &data); | |
4441 | break; | |
4442 | } | |
07975ad3 JK |
4443 | #ifdef CONFIG_HAVE_KVM_MSI |
4444 | case KVM_SIGNAL_MSI: { | |
4445 | struct kvm_msi msi; | |
4446 | ||
4447 | r = -EFAULT; | |
893bdbf1 | 4448 | if (copy_from_user(&msi, argp, sizeof(msi))) |
07975ad3 JK |
4449 | goto out; |
4450 | r = kvm_send_userspace_msi(kvm, &msi); | |
4451 | break; | |
4452 | } | |
23d43cf9 CD |
4453 | #endif |
4454 | #ifdef __KVM_HAVE_IRQ_LINE | |
4455 | case KVM_IRQ_LINE_STATUS: | |
4456 | case KVM_IRQ_LINE: { | |
4457 | struct kvm_irq_level irq_event; | |
4458 | ||
4459 | r = -EFAULT; | |
893bdbf1 | 4460 | if (copy_from_user(&irq_event, argp, sizeof(irq_event))) |
23d43cf9 CD |
4461 | goto out; |
4462 | ||
aa2fbe6d YZ |
4463 | r = kvm_vm_ioctl_irq_line(kvm, &irq_event, |
4464 | ioctl == KVM_IRQ_LINE_STATUS); | |
23d43cf9 CD |
4465 | if (r) |
4466 | goto out; | |
4467 | ||
4468 | r = -EFAULT; | |
4469 | if (ioctl == KVM_IRQ_LINE_STATUS) { | |
893bdbf1 | 4470 | if (copy_to_user(argp, &irq_event, sizeof(irq_event))) |
23d43cf9 CD |
4471 | goto out; |
4472 | } | |
4473 | ||
4474 | r = 0; | |
4475 | break; | |
4476 | } | |
73880c80 | 4477 | #endif |
aa8d5944 AG |
4478 | #ifdef CONFIG_HAVE_KVM_IRQ_ROUTING |
4479 | case KVM_SET_GSI_ROUTING: { | |
4480 | struct kvm_irq_routing routing; | |
4481 | struct kvm_irq_routing __user *urouting; | |
f8c1b85b | 4482 | struct kvm_irq_routing_entry *entries = NULL; |
aa8d5944 AG |
4483 | |
4484 | r = -EFAULT; | |
4485 | if (copy_from_user(&routing, argp, sizeof(routing))) | |
4486 | goto out; | |
4487 | r = -EINVAL; | |
5c0aea0e DH |
4488 | if (!kvm_arch_can_set_irq_routing(kvm)) |
4489 | goto out; | |
caf1ff26 | 4490 | if (routing.nr > KVM_MAX_IRQ_ROUTES) |
aa8d5944 AG |
4491 | goto out; |
4492 | if (routing.flags) | |
4493 | goto out; | |
f8c1b85b | 4494 | if (routing.nr) { |
f8c1b85b | 4495 | urouting = argp; |
7ec28e26 DE |
4496 | entries = vmemdup_user(urouting->entries, |
4497 | array_size(sizeof(*entries), | |
4498 | routing.nr)); | |
4499 | if (IS_ERR(entries)) { | |
4500 | r = PTR_ERR(entries); | |
4501 | goto out; | |
4502 | } | |
f8c1b85b | 4503 | } |
aa8d5944 AG |
4504 | r = kvm_set_irq_routing(kvm, entries, routing.nr, |
4505 | routing.flags); | |
7ec28e26 | 4506 | kvfree(entries); |
aa8d5944 AG |
4507 | break; |
4508 | } | |
4509 | #endif /* CONFIG_HAVE_KVM_IRQ_ROUTING */ | |
852b6d57 SW |
4510 | case KVM_CREATE_DEVICE: { |
4511 | struct kvm_create_device cd; | |
4512 | ||
4513 | r = -EFAULT; | |
4514 | if (copy_from_user(&cd, argp, sizeof(cd))) | |
4515 | goto out; | |
4516 | ||
4517 | r = kvm_ioctl_create_device(kvm, &cd); | |
4518 | if (r) | |
4519 | goto out; | |
4520 | ||
4521 | r = -EFAULT; | |
4522 | if (copy_to_user(argp, &cd, sizeof(cd))) | |
4523 | goto out; | |
4524 | ||
4525 | r = 0; | |
4526 | break; | |
4527 | } | |
92b591a4 AG |
4528 | case KVM_CHECK_EXTENSION: |
4529 | r = kvm_vm_ioctl_check_extension_generic(kvm, arg); | |
4530 | break; | |
fb04a1ed PX |
4531 | case KVM_RESET_DIRTY_RINGS: |
4532 | r = kvm_vm_ioctl_reset_dirty_pages(kvm); | |
4533 | break; | |
fcfe1bae JZ |
4534 | case KVM_GET_STATS_FD: |
4535 | r = kvm_vm_ioctl_get_stats_fd(kvm); | |
4536 | break; | |
f17abe9a | 4537 | default: |
1fe779f8 | 4538 | r = kvm_arch_vm_ioctl(filp, ioctl, arg); |
f17abe9a AK |
4539 | } |
4540 | out: | |
4541 | return r; | |
4542 | } | |
4543 | ||
de8e5d74 | 4544 | #ifdef CONFIG_KVM_COMPAT |
6ff5894c AB |
4545 | struct compat_kvm_dirty_log { |
4546 | __u32 slot; | |
4547 | __u32 padding1; | |
4548 | union { | |
4549 | compat_uptr_t dirty_bitmap; /* one bit per page */ | |
4550 | __u64 padding2; | |
4551 | }; | |
4552 | }; | |
4553 | ||
8750f9bb PB |
4554 | struct compat_kvm_clear_dirty_log { |
4555 | __u32 slot; | |
4556 | __u32 num_pages; | |
4557 | __u64 first_page; | |
4558 | union { | |
4559 | compat_uptr_t dirty_bitmap; /* one bit per page */ | |
4560 | __u64 padding2; | |
4561 | }; | |
4562 | }; | |
4563 | ||
6ff5894c AB |
4564 | static long kvm_vm_compat_ioctl(struct file *filp, |
4565 | unsigned int ioctl, unsigned long arg) | |
4566 | { | |
4567 | struct kvm *kvm = filp->private_data; | |
4568 | int r; | |
4569 | ||
0b8f1173 | 4570 | if (kvm->mm != current->mm || kvm->vm_bugged) |
6ff5894c AB |
4571 | return -EIO; |
4572 | switch (ioctl) { | |
8750f9bb PB |
4573 | #ifdef CONFIG_KVM_GENERIC_DIRTYLOG_READ_PROTECT |
4574 | case KVM_CLEAR_DIRTY_LOG: { | |
4575 | struct compat_kvm_clear_dirty_log compat_log; | |
4576 | struct kvm_clear_dirty_log log; | |
4577 | ||
4578 | if (copy_from_user(&compat_log, (void __user *)arg, | |
4579 | sizeof(compat_log))) | |
4580 | return -EFAULT; | |
4581 | log.slot = compat_log.slot; | |
4582 | log.num_pages = compat_log.num_pages; | |
4583 | log.first_page = compat_log.first_page; | |
4584 | log.padding2 = compat_log.padding2; | |
4585 | log.dirty_bitmap = compat_ptr(compat_log.dirty_bitmap); | |
4586 | ||
4587 | r = kvm_vm_ioctl_clear_dirty_log(kvm, &log); | |
4588 | break; | |
4589 | } | |
4590 | #endif | |
6ff5894c AB |
4591 | case KVM_GET_DIRTY_LOG: { |
4592 | struct compat_kvm_dirty_log compat_log; | |
4593 | struct kvm_dirty_log log; | |
4594 | ||
6ff5894c AB |
4595 | if (copy_from_user(&compat_log, (void __user *)arg, |
4596 | sizeof(compat_log))) | |
f6a3b168 | 4597 | return -EFAULT; |
6ff5894c AB |
4598 | log.slot = compat_log.slot; |
4599 | log.padding1 = compat_log.padding1; | |
4600 | log.padding2 = compat_log.padding2; | |
4601 | log.dirty_bitmap = compat_ptr(compat_log.dirty_bitmap); | |
4602 | ||
4603 | r = kvm_vm_ioctl_get_dirty_log(kvm, &log); | |
6ff5894c AB |
4604 | break; |
4605 | } | |
4606 | default: | |
4607 | r = kvm_vm_ioctl(filp, ioctl, arg); | |
4608 | } | |
6ff5894c AB |
4609 | return r; |
4610 | } | |
4611 | #endif | |
4612 | ||
3d3aab1b | 4613 | static struct file_operations kvm_vm_fops = { |
f17abe9a AK |
4614 | .release = kvm_vm_release, |
4615 | .unlocked_ioctl = kvm_vm_ioctl, | |
6038f373 | 4616 | .llseek = noop_llseek, |
7ddfd3e0 | 4617 | KVM_COMPAT(kvm_vm_compat_ioctl), |
f17abe9a AK |
4618 | }; |
4619 | ||
54526d1f NT |
4620 | bool file_is_kvm(struct file *file) |
4621 | { | |
4622 | return file && file->f_op == &kvm_vm_fops; | |
4623 | } | |
4624 | EXPORT_SYMBOL_GPL(file_is_kvm); | |
4625 | ||
e08b9637 | 4626 | static int kvm_dev_ioctl_create_vm(unsigned long type) |
f17abe9a | 4627 | { |
aac87636 | 4628 | int r; |
f17abe9a | 4629 | struct kvm *kvm; |
506cfba9 | 4630 | struct file *file; |
f17abe9a | 4631 | |
e08b9637 | 4632 | kvm = kvm_create_vm(type); |
d6d28168 AK |
4633 | if (IS_ERR(kvm)) |
4634 | return PTR_ERR(kvm); | |
4b4357e0 | 4635 | #ifdef CONFIG_KVM_MMIO |
6ce5a090 | 4636 | r = kvm_coalesced_mmio_init(kvm); |
78588335 ME |
4637 | if (r < 0) |
4638 | goto put_kvm; | |
6ce5a090 | 4639 | #endif |
506cfba9 | 4640 | r = get_unused_fd_flags(O_CLOEXEC); |
78588335 ME |
4641 | if (r < 0) |
4642 | goto put_kvm; | |
4643 | ||
fcfe1bae JZ |
4644 | snprintf(kvm->stats_id, sizeof(kvm->stats_id), |
4645 | "kvm-%d", task_pid_nr(current)); | |
4646 | ||
506cfba9 AV |
4647 | file = anon_inode_getfile("kvm-vm", &kvm_vm_fops, kvm, O_RDWR); |
4648 | if (IS_ERR(file)) { | |
4649 | put_unused_fd(r); | |
78588335 ME |
4650 | r = PTR_ERR(file); |
4651 | goto put_kvm; | |
506cfba9 | 4652 | } |
536a6f88 | 4653 | |
525df861 PB |
4654 | /* |
4655 | * Don't call kvm_put_kvm anymore at this point; file->f_op is | |
4656 | * already set, with ->release() being kvm_vm_release(). In error | |
4657 | * cases it will be called by the final fput(file) and will take | |
4658 | * care of doing kvm_put_kvm(kvm). | |
4659 | */ | |
536a6f88 | 4660 | if (kvm_create_vm_debugfs(kvm, r) < 0) { |
506cfba9 AV |
4661 | put_unused_fd(r); |
4662 | fput(file); | |
536a6f88 JF |
4663 | return -ENOMEM; |
4664 | } | |
286de8f6 | 4665 | kvm_uevent_notify_change(KVM_EVENT_CREATE_VM, kvm); |
f17abe9a | 4666 | |
506cfba9 | 4667 | fd_install(r, file); |
aac87636 | 4668 | return r; |
78588335 ME |
4669 | |
4670 | put_kvm: | |
4671 | kvm_put_kvm(kvm); | |
4672 | return r; | |
f17abe9a AK |
4673 | } |
4674 | ||
4675 | static long kvm_dev_ioctl(struct file *filp, | |
4676 | unsigned int ioctl, unsigned long arg) | |
4677 | { | |
07c45a36 | 4678 | long r = -EINVAL; |
f17abe9a AK |
4679 | |
4680 | switch (ioctl) { | |
4681 | case KVM_GET_API_VERSION: | |
f0fe5108 AK |
4682 | if (arg) |
4683 | goto out; | |
f17abe9a AK |
4684 | r = KVM_API_VERSION; |
4685 | break; | |
4686 | case KVM_CREATE_VM: | |
e08b9637 | 4687 | r = kvm_dev_ioctl_create_vm(arg); |
f17abe9a | 4688 | break; |
018d00d2 | 4689 | case KVM_CHECK_EXTENSION: |
784aa3d7 | 4690 | r = kvm_vm_ioctl_check_extension_generic(NULL, arg); |
5d308f45 | 4691 | break; |
07c45a36 | 4692 | case KVM_GET_VCPU_MMAP_SIZE: |
07c45a36 AK |
4693 | if (arg) |
4694 | goto out; | |
adb1ff46 AK |
4695 | r = PAGE_SIZE; /* struct kvm_run */ |
4696 | #ifdef CONFIG_X86 | |
4697 | r += PAGE_SIZE; /* pio data page */ | |
5f94c174 | 4698 | #endif |
4b4357e0 | 4699 | #ifdef CONFIG_KVM_MMIO |
5f94c174 | 4700 | r += PAGE_SIZE; /* coalesced mmio ring page */ |
adb1ff46 | 4701 | #endif |
07c45a36 | 4702 | break; |
d4c9ff2d FEL |
4703 | case KVM_TRACE_ENABLE: |
4704 | case KVM_TRACE_PAUSE: | |
4705 | case KVM_TRACE_DISABLE: | |
2023a29c | 4706 | r = -EOPNOTSUPP; |
d4c9ff2d | 4707 | break; |
6aa8b732 | 4708 | default: |
043405e1 | 4709 | return kvm_arch_dev_ioctl(filp, ioctl, arg); |
6aa8b732 AK |
4710 | } |
4711 | out: | |
4712 | return r; | |
4713 | } | |
4714 | ||
6aa8b732 | 4715 | static struct file_operations kvm_chardev_ops = { |
6aa8b732 | 4716 | .unlocked_ioctl = kvm_dev_ioctl, |
6038f373 | 4717 | .llseek = noop_llseek, |
7ddfd3e0 | 4718 | KVM_COMPAT(kvm_dev_ioctl), |
6aa8b732 AK |
4719 | }; |
4720 | ||
4721 | static struct miscdevice kvm_dev = { | |
bbe4432e | 4722 | KVM_MINOR, |
6aa8b732 AK |
4723 | "kvm", |
4724 | &kvm_chardev_ops, | |
4725 | }; | |
4726 | ||
75b7127c | 4727 | static void hardware_enable_nolock(void *junk) |
1b6c0168 AK |
4728 | { |
4729 | int cpu = raw_smp_processor_id(); | |
10474ae8 | 4730 | int r; |
1b6c0168 | 4731 | |
7f59f492 | 4732 | if (cpumask_test_cpu(cpu, cpus_hardware_enabled)) |
1b6c0168 | 4733 | return; |
10474ae8 | 4734 | |
7f59f492 | 4735 | cpumask_set_cpu(cpu, cpus_hardware_enabled); |
10474ae8 | 4736 | |
13a34e06 | 4737 | r = kvm_arch_hardware_enable(); |
10474ae8 AG |
4738 | |
4739 | if (r) { | |
4740 | cpumask_clear_cpu(cpu, cpus_hardware_enabled); | |
4741 | atomic_inc(&hardware_enable_failed); | |
1170adc6 | 4742 | pr_info("kvm: enabling virtualization on CPU%d failed\n", cpu); |
10474ae8 | 4743 | } |
1b6c0168 AK |
4744 | } |
4745 | ||
8c18b2d2 | 4746 | static int kvm_starting_cpu(unsigned int cpu) |
75b7127c | 4747 | { |
4a937f96 | 4748 | raw_spin_lock(&kvm_count_lock); |
4fa92fb2 PB |
4749 | if (kvm_usage_count) |
4750 | hardware_enable_nolock(NULL); | |
4a937f96 | 4751 | raw_spin_unlock(&kvm_count_lock); |
8c18b2d2 | 4752 | return 0; |
75b7127c TY |
4753 | } |
4754 | ||
4755 | static void hardware_disable_nolock(void *junk) | |
1b6c0168 AK |
4756 | { |
4757 | int cpu = raw_smp_processor_id(); | |
4758 | ||
7f59f492 | 4759 | if (!cpumask_test_cpu(cpu, cpus_hardware_enabled)) |
1b6c0168 | 4760 | return; |
7f59f492 | 4761 | cpumask_clear_cpu(cpu, cpus_hardware_enabled); |
13a34e06 | 4762 | kvm_arch_hardware_disable(); |
1b6c0168 AK |
4763 | } |
4764 | ||
8c18b2d2 | 4765 | static int kvm_dying_cpu(unsigned int cpu) |
75b7127c | 4766 | { |
4a937f96 | 4767 | raw_spin_lock(&kvm_count_lock); |
4fa92fb2 PB |
4768 | if (kvm_usage_count) |
4769 | hardware_disable_nolock(NULL); | |
4a937f96 | 4770 | raw_spin_unlock(&kvm_count_lock); |
8c18b2d2 | 4771 | return 0; |
75b7127c TY |
4772 | } |
4773 | ||
10474ae8 AG |
4774 | static void hardware_disable_all_nolock(void) |
4775 | { | |
4776 | BUG_ON(!kvm_usage_count); | |
4777 | ||
4778 | kvm_usage_count--; | |
4779 | if (!kvm_usage_count) | |
75b7127c | 4780 | on_each_cpu(hardware_disable_nolock, NULL, 1); |
10474ae8 AG |
4781 | } |
4782 | ||
4783 | static void hardware_disable_all(void) | |
4784 | { | |
4a937f96 | 4785 | raw_spin_lock(&kvm_count_lock); |
10474ae8 | 4786 | hardware_disable_all_nolock(); |
4a937f96 | 4787 | raw_spin_unlock(&kvm_count_lock); |
10474ae8 AG |
4788 | } |
4789 | ||
4790 | static int hardware_enable_all(void) | |
4791 | { | |
4792 | int r = 0; | |
4793 | ||
4a937f96 | 4794 | raw_spin_lock(&kvm_count_lock); |
10474ae8 AG |
4795 | |
4796 | kvm_usage_count++; | |
4797 | if (kvm_usage_count == 1) { | |
4798 | atomic_set(&hardware_enable_failed, 0); | |
75b7127c | 4799 | on_each_cpu(hardware_enable_nolock, NULL, 1); |
10474ae8 AG |
4800 | |
4801 | if (atomic_read(&hardware_enable_failed)) { | |
4802 | hardware_disable_all_nolock(); | |
4803 | r = -EBUSY; | |
4804 | } | |
4805 | } | |
4806 | ||
4a937f96 | 4807 | raw_spin_unlock(&kvm_count_lock); |
10474ae8 AG |
4808 | |
4809 | return r; | |
4810 | } | |
4811 | ||
9a2b85c6 | 4812 | static int kvm_reboot(struct notifier_block *notifier, unsigned long val, |
d77c26fc | 4813 | void *v) |
9a2b85c6 | 4814 | { |
8e1c1815 SY |
4815 | /* |
4816 | * Some (well, at least mine) BIOSes hang on reboot if | |
4817 | * in vmx root mode. | |
4818 | * | |
4819 | * And Intel TXT required VMX off for all cpu when system shutdown. | |
4820 | */ | |
1170adc6 | 4821 | pr_info("kvm: exiting hardware virtualization\n"); |
8e1c1815 | 4822 | kvm_rebooting = true; |
75b7127c | 4823 | on_each_cpu(hardware_disable_nolock, NULL, 1); |
9a2b85c6 RR |
4824 | return NOTIFY_OK; |
4825 | } | |
4826 | ||
4827 | static struct notifier_block kvm_reboot_notifier = { | |
4828 | .notifier_call = kvm_reboot, | |
4829 | .priority = 0, | |
4830 | }; | |
4831 | ||
e93f8a0f | 4832 | static void kvm_io_bus_destroy(struct kvm_io_bus *bus) |
2eeb2e94 GH |
4833 | { |
4834 | int i; | |
4835 | ||
4836 | for (i = 0; i < bus->dev_count; i++) { | |
743eeb0b | 4837 | struct kvm_io_device *pos = bus->range[i].dev; |
2eeb2e94 GH |
4838 | |
4839 | kvm_iodevice_destructor(pos); | |
4840 | } | |
e93f8a0f | 4841 | kfree(bus); |
2eeb2e94 GH |
4842 | } |
4843 | ||
c21fbff1 | 4844 | static inline int kvm_io_bus_cmp(const struct kvm_io_range *r1, |
20e87b72 | 4845 | const struct kvm_io_range *r2) |
743eeb0b | 4846 | { |
8f4216c7 JW |
4847 | gpa_t addr1 = r1->addr; |
4848 | gpa_t addr2 = r2->addr; | |
4849 | ||
4850 | if (addr1 < addr2) | |
743eeb0b | 4851 | return -1; |
8f4216c7 JW |
4852 | |
4853 | /* If r2->len == 0, match the exact address. If r2->len != 0, | |
4854 | * accept any overlapping write. Any order is acceptable for | |
4855 | * overlapping ranges, because kvm_io_bus_get_first_dev ensures | |
4856 | * we process all of them. | |
4857 | */ | |
4858 | if (r2->len) { | |
4859 | addr1 += r1->len; | |
4860 | addr2 += r2->len; | |
4861 | } | |
4862 | ||
4863 | if (addr1 > addr2) | |
743eeb0b | 4864 | return 1; |
8f4216c7 | 4865 | |
743eeb0b SL |
4866 | return 0; |
4867 | } | |
4868 | ||
a343c9b7 PB |
4869 | static int kvm_io_bus_sort_cmp(const void *p1, const void *p2) |
4870 | { | |
c21fbff1 | 4871 | return kvm_io_bus_cmp(p1, p2); |
a343c9b7 PB |
4872 | } |
4873 | ||
39369f7a | 4874 | static int kvm_io_bus_get_first_dev(struct kvm_io_bus *bus, |
743eeb0b SL |
4875 | gpa_t addr, int len) |
4876 | { | |
4877 | struct kvm_io_range *range, key; | |
4878 | int off; | |
4879 | ||
4880 | key = (struct kvm_io_range) { | |
4881 | .addr = addr, | |
4882 | .len = len, | |
4883 | }; | |
4884 | ||
4885 | range = bsearch(&key, bus->range, bus->dev_count, | |
4886 | sizeof(struct kvm_io_range), kvm_io_bus_sort_cmp); | |
4887 | if (range == NULL) | |
4888 | return -ENOENT; | |
4889 | ||
4890 | off = range - bus->range; | |
4891 | ||
c21fbff1 | 4892 | while (off > 0 && kvm_io_bus_cmp(&key, &bus->range[off-1]) == 0) |
743eeb0b SL |
4893 | off--; |
4894 | ||
4895 | return off; | |
4896 | } | |
4897 | ||
e32edf4f | 4898 | static int __kvm_io_bus_write(struct kvm_vcpu *vcpu, struct kvm_io_bus *bus, |
126a5af5 CH |
4899 | struct kvm_io_range *range, const void *val) |
4900 | { | |
4901 | int idx; | |
4902 | ||
4903 | idx = kvm_io_bus_get_first_dev(bus, range->addr, range->len); | |
4904 | if (idx < 0) | |
4905 | return -EOPNOTSUPP; | |
4906 | ||
4907 | while (idx < bus->dev_count && | |
c21fbff1 | 4908 | kvm_io_bus_cmp(range, &bus->range[idx]) == 0) { |
e32edf4f | 4909 | if (!kvm_iodevice_write(vcpu, bus->range[idx].dev, range->addr, |
126a5af5 CH |
4910 | range->len, val)) |
4911 | return idx; | |
4912 | idx++; | |
4913 | } | |
4914 | ||
4915 | return -EOPNOTSUPP; | |
4916 | } | |
4917 | ||
bda9020e | 4918 | /* kvm_io_bus_write - called under kvm->slots_lock */ |
e32edf4f | 4919 | int kvm_io_bus_write(struct kvm_vcpu *vcpu, enum kvm_bus bus_idx, gpa_t addr, |
bda9020e | 4920 | int len, const void *val) |
2eeb2e94 | 4921 | { |
90d83dc3 | 4922 | struct kvm_io_bus *bus; |
743eeb0b | 4923 | struct kvm_io_range range; |
126a5af5 | 4924 | int r; |
743eeb0b SL |
4925 | |
4926 | range = (struct kvm_io_range) { | |
4927 | .addr = addr, | |
4928 | .len = len, | |
4929 | }; | |
90d83dc3 | 4930 | |
e32edf4f | 4931 | bus = srcu_dereference(vcpu->kvm->buses[bus_idx], &vcpu->kvm->srcu); |
90db1043 DH |
4932 | if (!bus) |
4933 | return -ENOMEM; | |
e32edf4f | 4934 | r = __kvm_io_bus_write(vcpu, bus, &range, val); |
126a5af5 CH |
4935 | return r < 0 ? r : 0; |
4936 | } | |
a2420107 | 4937 | EXPORT_SYMBOL_GPL(kvm_io_bus_write); |
126a5af5 CH |
4938 | |
4939 | /* kvm_io_bus_write_cookie - called under kvm->slots_lock */ | |
e32edf4f NN |
4940 | int kvm_io_bus_write_cookie(struct kvm_vcpu *vcpu, enum kvm_bus bus_idx, |
4941 | gpa_t addr, int len, const void *val, long cookie) | |
126a5af5 CH |
4942 | { |
4943 | struct kvm_io_bus *bus; | |
4944 | struct kvm_io_range range; | |
4945 | ||
4946 | range = (struct kvm_io_range) { | |
4947 | .addr = addr, | |
4948 | .len = len, | |
4949 | }; | |
4950 | ||
e32edf4f | 4951 | bus = srcu_dereference(vcpu->kvm->buses[bus_idx], &vcpu->kvm->srcu); |
90db1043 DH |
4952 | if (!bus) |
4953 | return -ENOMEM; | |
126a5af5 CH |
4954 | |
4955 | /* First try the device referenced by cookie. */ | |
4956 | if ((cookie >= 0) && (cookie < bus->dev_count) && | |
c21fbff1 | 4957 | (kvm_io_bus_cmp(&range, &bus->range[cookie]) == 0)) |
e32edf4f | 4958 | if (!kvm_iodevice_write(vcpu, bus->range[cookie].dev, addr, len, |
126a5af5 CH |
4959 | val)) |
4960 | return cookie; | |
4961 | ||
4962 | /* | |
4963 | * cookie contained garbage; fall back to search and return the | |
4964 | * correct cookie value. | |
4965 | */ | |
e32edf4f | 4966 | return __kvm_io_bus_write(vcpu, bus, &range, val); |
126a5af5 CH |
4967 | } |
4968 | ||
e32edf4f NN |
4969 | static int __kvm_io_bus_read(struct kvm_vcpu *vcpu, struct kvm_io_bus *bus, |
4970 | struct kvm_io_range *range, void *val) | |
126a5af5 CH |
4971 | { |
4972 | int idx; | |
4973 | ||
4974 | idx = kvm_io_bus_get_first_dev(bus, range->addr, range->len); | |
743eeb0b SL |
4975 | if (idx < 0) |
4976 | return -EOPNOTSUPP; | |
4977 | ||
4978 | while (idx < bus->dev_count && | |
c21fbff1 | 4979 | kvm_io_bus_cmp(range, &bus->range[idx]) == 0) { |
e32edf4f | 4980 | if (!kvm_iodevice_read(vcpu, bus->range[idx].dev, range->addr, |
126a5af5 CH |
4981 | range->len, val)) |
4982 | return idx; | |
743eeb0b SL |
4983 | idx++; |
4984 | } | |
4985 | ||
bda9020e MT |
4986 | return -EOPNOTSUPP; |
4987 | } | |
2eeb2e94 | 4988 | |
bda9020e | 4989 | /* kvm_io_bus_read - called under kvm->slots_lock */ |
e32edf4f | 4990 | int kvm_io_bus_read(struct kvm_vcpu *vcpu, enum kvm_bus bus_idx, gpa_t addr, |
e93f8a0f | 4991 | int len, void *val) |
bda9020e | 4992 | { |
90d83dc3 | 4993 | struct kvm_io_bus *bus; |
743eeb0b | 4994 | struct kvm_io_range range; |
126a5af5 | 4995 | int r; |
743eeb0b SL |
4996 | |
4997 | range = (struct kvm_io_range) { | |
4998 | .addr = addr, | |
4999 | .len = len, | |
5000 | }; | |
e93f8a0f | 5001 | |
e32edf4f | 5002 | bus = srcu_dereference(vcpu->kvm->buses[bus_idx], &vcpu->kvm->srcu); |
90db1043 DH |
5003 | if (!bus) |
5004 | return -ENOMEM; | |
e32edf4f | 5005 | r = __kvm_io_bus_read(vcpu, bus, &range, val); |
126a5af5 CH |
5006 | return r < 0 ? r : 0; |
5007 | } | |
743eeb0b | 5008 | |
79fac95e | 5009 | /* Caller must hold slots_lock. */ |
743eeb0b SL |
5010 | int kvm_io_bus_register_dev(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr, |
5011 | int len, struct kvm_io_device *dev) | |
6c474694 | 5012 | { |
d4c67a7a | 5013 | int i; |
e93f8a0f | 5014 | struct kvm_io_bus *new_bus, *bus; |
d4c67a7a | 5015 | struct kvm_io_range range; |
090b7aff | 5016 | |
4a12f951 | 5017 | bus = kvm_get_bus(kvm, bus_idx); |
90db1043 DH |
5018 | if (!bus) |
5019 | return -ENOMEM; | |
5020 | ||
6ea34c9b AK |
5021 | /* exclude ioeventfd which is limited by maximum fd */ |
5022 | if (bus->dev_count - bus->ioeventfd_count > NR_IOBUS_DEVS - 1) | |
090b7aff | 5023 | return -ENOSPC; |
2eeb2e94 | 5024 | |
90952cd3 | 5025 | new_bus = kmalloc(struct_size(bus, range, bus->dev_count + 1), |
b12ce36a | 5026 | GFP_KERNEL_ACCOUNT); |
e93f8a0f MT |
5027 | if (!new_bus) |
5028 | return -ENOMEM; | |
d4c67a7a GH |
5029 | |
5030 | range = (struct kvm_io_range) { | |
5031 | .addr = addr, | |
5032 | .len = len, | |
5033 | .dev = dev, | |
5034 | }; | |
5035 | ||
5036 | for (i = 0; i < bus->dev_count; i++) | |
5037 | if (kvm_io_bus_cmp(&bus->range[i], &range) > 0) | |
5038 | break; | |
5039 | ||
5040 | memcpy(new_bus, bus, sizeof(*bus) + i * sizeof(struct kvm_io_range)); | |
5041 | new_bus->dev_count++; | |
5042 | new_bus->range[i] = range; | |
5043 | memcpy(new_bus->range + i + 1, bus->range + i, | |
5044 | (bus->dev_count - i) * sizeof(struct kvm_io_range)); | |
e93f8a0f MT |
5045 | rcu_assign_pointer(kvm->buses[bus_idx], new_bus); |
5046 | synchronize_srcu_expedited(&kvm->srcu); | |
5047 | kfree(bus); | |
090b7aff GH |
5048 | |
5049 | return 0; | |
5050 | } | |
5051 | ||
5d3c4c79 SC |
5052 | int kvm_io_bus_unregister_dev(struct kvm *kvm, enum kvm_bus bus_idx, |
5053 | struct kvm_io_device *dev) | |
090b7aff | 5054 | { |
f6588660 | 5055 | int i, j; |
e93f8a0f | 5056 | struct kvm_io_bus *new_bus, *bus; |
090b7aff | 5057 | |
7c896d37 SC |
5058 | lockdep_assert_held(&kvm->slots_lock); |
5059 | ||
4a12f951 | 5060 | bus = kvm_get_bus(kvm, bus_idx); |
df630b8c | 5061 | if (!bus) |
5d3c4c79 | 5062 | return 0; |
df630b8c | 5063 | |
7c896d37 | 5064 | for (i = 0; i < bus->dev_count; i++) { |
a1300716 | 5065 | if (bus->range[i].dev == dev) { |
090b7aff GH |
5066 | break; |
5067 | } | |
7c896d37 | 5068 | } |
e93f8a0f | 5069 | |
90db1043 | 5070 | if (i == bus->dev_count) |
5d3c4c79 | 5071 | return 0; |
a1300716 | 5072 | |
90952cd3 | 5073 | new_bus = kmalloc(struct_size(bus, range, bus->dev_count - 1), |
b12ce36a | 5074 | GFP_KERNEL_ACCOUNT); |
f6588660 | 5075 | if (new_bus) { |
871c433b | 5076 | memcpy(new_bus, bus, struct_size(bus, range, i)); |
f6588660 RK |
5077 | new_bus->dev_count--; |
5078 | memcpy(new_bus->range + i, bus->range + i + 1, | |
871c433b | 5079 | flex_array_size(new_bus, range, new_bus->dev_count - i)); |
2ee37574 SC |
5080 | } |
5081 | ||
5082 | rcu_assign_pointer(kvm->buses[bus_idx], new_bus); | |
5083 | synchronize_srcu_expedited(&kvm->srcu); | |
5084 | ||
5085 | /* Destroy the old bus _after_ installing the (null) bus. */ | |
5086 | if (!new_bus) { | |
90db1043 | 5087 | pr_err("kvm: failed to shrink bus, removing it completely\n"); |
f6588660 RK |
5088 | for (j = 0; j < bus->dev_count; j++) { |
5089 | if (j == i) | |
5090 | continue; | |
5091 | kvm_iodevice_destructor(bus->range[j].dev); | |
5092 | } | |
90db1043 | 5093 | } |
a1300716 | 5094 | |
e93f8a0f | 5095 | kfree(bus); |
5d3c4c79 | 5096 | return new_bus ? 0 : -ENOMEM; |
2eeb2e94 GH |
5097 | } |
5098 | ||
8a39d006 AP |
5099 | struct kvm_io_device *kvm_io_bus_get_dev(struct kvm *kvm, enum kvm_bus bus_idx, |
5100 | gpa_t addr) | |
5101 | { | |
5102 | struct kvm_io_bus *bus; | |
5103 | int dev_idx, srcu_idx; | |
5104 | struct kvm_io_device *iodev = NULL; | |
5105 | ||
5106 | srcu_idx = srcu_read_lock(&kvm->srcu); | |
5107 | ||
5108 | bus = srcu_dereference(kvm->buses[bus_idx], &kvm->srcu); | |
90db1043 DH |
5109 | if (!bus) |
5110 | goto out_unlock; | |
8a39d006 AP |
5111 | |
5112 | dev_idx = kvm_io_bus_get_first_dev(bus, addr, 1); | |
5113 | if (dev_idx < 0) | |
5114 | goto out_unlock; | |
5115 | ||
5116 | iodev = bus->range[dev_idx].dev; | |
5117 | ||
5118 | out_unlock: | |
5119 | srcu_read_unlock(&kvm->srcu, srcu_idx); | |
5120 | ||
5121 | return iodev; | |
5122 | } | |
5123 | EXPORT_SYMBOL_GPL(kvm_io_bus_get_dev); | |
5124 | ||
536a6f88 JF |
5125 | static int kvm_debugfs_open(struct inode *inode, struct file *file, |
5126 | int (*get)(void *, u64 *), int (*set)(void *, u64), | |
5127 | const char *fmt) | |
5128 | { | |
5129 | struct kvm_stat_data *stat_data = (struct kvm_stat_data *) | |
5130 | inode->i_private; | |
5131 | ||
605c7130 PX |
5132 | /* |
5133 | * The debugfs files are a reference to the kvm struct which | |
5134 | * is still valid when kvm_destroy_vm is called. kvm_get_kvm_safe | |
5135 | * avoids the race between open and the removal of the debugfs directory. | |
536a6f88 | 5136 | */ |
605c7130 | 5137 | if (!kvm_get_kvm_safe(stat_data->kvm)) |
536a6f88 JF |
5138 | return -ENOENT; |
5139 | ||
833b45de | 5140 | if (simple_attr_open(inode, file, get, |
bc9e9e67 | 5141 | kvm_stats_debugfs_mode(stat_data->desc) & 0222 |
09cbcef6 MP |
5142 | ? set : NULL, |
5143 | fmt)) { | |
536a6f88 JF |
5144 | kvm_put_kvm(stat_data->kvm); |
5145 | return -ENOMEM; | |
5146 | } | |
5147 | ||
5148 | return 0; | |
5149 | } | |
5150 | ||
5151 | static int kvm_debugfs_release(struct inode *inode, struct file *file) | |
5152 | { | |
5153 | struct kvm_stat_data *stat_data = (struct kvm_stat_data *) | |
5154 | inode->i_private; | |
5155 | ||
5156 | simple_attr_release(inode, file); | |
5157 | kvm_put_kvm(stat_data->kvm); | |
5158 | ||
5159 | return 0; | |
5160 | } | |
5161 | ||
09cbcef6 | 5162 | static int kvm_get_stat_per_vm(struct kvm *kvm, size_t offset, u64 *val) |
536a6f88 | 5163 | { |
bc9e9e67 | 5164 | *val = *(u64 *)((void *)(&kvm->stat) + offset); |
536a6f88 | 5165 | |
09cbcef6 MP |
5166 | return 0; |
5167 | } | |
5168 | ||
5169 | static int kvm_clear_stat_per_vm(struct kvm *kvm, size_t offset) | |
5170 | { | |
bc9e9e67 | 5171 | *(u64 *)((void *)(&kvm->stat) + offset) = 0; |
536a6f88 JF |
5172 | |
5173 | return 0; | |
5174 | } | |
5175 | ||
09cbcef6 | 5176 | static int kvm_get_stat_per_vcpu(struct kvm *kvm, size_t offset, u64 *val) |
ce35ef27 | 5177 | { |
09cbcef6 MP |
5178 | int i; |
5179 | struct kvm_vcpu *vcpu; | |
ce35ef27 | 5180 | |
09cbcef6 | 5181 | *val = 0; |
ce35ef27 | 5182 | |
09cbcef6 | 5183 | kvm_for_each_vcpu(i, vcpu, kvm) |
bc9e9e67 | 5184 | *val += *(u64 *)((void *)(&vcpu->stat) + offset); |
ce35ef27 SJS |
5185 | |
5186 | return 0; | |
5187 | } | |
5188 | ||
09cbcef6 | 5189 | static int kvm_clear_stat_per_vcpu(struct kvm *kvm, size_t offset) |
536a6f88 | 5190 | { |
09cbcef6 MP |
5191 | int i; |
5192 | struct kvm_vcpu *vcpu; | |
536a6f88 | 5193 | |
09cbcef6 | 5194 | kvm_for_each_vcpu(i, vcpu, kvm) |
bc9e9e67 | 5195 | *(u64 *)((void *)(&vcpu->stat) + offset) = 0; |
09cbcef6 MP |
5196 | |
5197 | return 0; | |
5198 | } | |
536a6f88 | 5199 | |
09cbcef6 | 5200 | static int kvm_stat_data_get(void *data, u64 *val) |
536a6f88 | 5201 | { |
09cbcef6 | 5202 | int r = -EFAULT; |
536a6f88 | 5203 | struct kvm_stat_data *stat_data = (struct kvm_stat_data *)data; |
536a6f88 | 5204 | |
bc9e9e67 | 5205 | switch (stat_data->kind) { |
09cbcef6 MP |
5206 | case KVM_STAT_VM: |
5207 | r = kvm_get_stat_per_vm(stat_data->kvm, | |
bc9e9e67 | 5208 | stat_data->desc->desc.offset, val); |
09cbcef6 MP |
5209 | break; |
5210 | case KVM_STAT_VCPU: | |
5211 | r = kvm_get_stat_per_vcpu(stat_data->kvm, | |
bc9e9e67 | 5212 | stat_data->desc->desc.offset, val); |
09cbcef6 MP |
5213 | break; |
5214 | } | |
536a6f88 | 5215 | |
09cbcef6 | 5216 | return r; |
536a6f88 JF |
5217 | } |
5218 | ||
09cbcef6 | 5219 | static int kvm_stat_data_clear(void *data, u64 val) |
ce35ef27 | 5220 | { |
09cbcef6 | 5221 | int r = -EFAULT; |
ce35ef27 | 5222 | struct kvm_stat_data *stat_data = (struct kvm_stat_data *)data; |
ce35ef27 SJS |
5223 | |
5224 | if (val) | |
5225 | return -EINVAL; | |
5226 | ||
bc9e9e67 | 5227 | switch (stat_data->kind) { |
09cbcef6 MP |
5228 | case KVM_STAT_VM: |
5229 | r = kvm_clear_stat_per_vm(stat_data->kvm, | |
bc9e9e67 | 5230 | stat_data->desc->desc.offset); |
09cbcef6 MP |
5231 | break; |
5232 | case KVM_STAT_VCPU: | |
5233 | r = kvm_clear_stat_per_vcpu(stat_data->kvm, | |
bc9e9e67 | 5234 | stat_data->desc->desc.offset); |
09cbcef6 MP |
5235 | break; |
5236 | } | |
ce35ef27 | 5237 | |
09cbcef6 | 5238 | return r; |
ce35ef27 SJS |
5239 | } |
5240 | ||
09cbcef6 | 5241 | static int kvm_stat_data_open(struct inode *inode, struct file *file) |
536a6f88 JF |
5242 | { |
5243 | __simple_attr_check_format("%llu\n", 0ull); | |
09cbcef6 MP |
5244 | return kvm_debugfs_open(inode, file, kvm_stat_data_get, |
5245 | kvm_stat_data_clear, "%llu\n"); | |
536a6f88 JF |
5246 | } |
5247 | ||
09cbcef6 MP |
5248 | static const struct file_operations stat_fops_per_vm = { |
5249 | .owner = THIS_MODULE, | |
5250 | .open = kvm_stat_data_open, | |
536a6f88 | 5251 | .release = kvm_debugfs_release, |
09cbcef6 MP |
5252 | .read = simple_attr_read, |
5253 | .write = simple_attr_write, | |
5254 | .llseek = no_llseek, | |
536a6f88 JF |
5255 | }; |
5256 | ||
8b88b099 | 5257 | static int vm_stat_get(void *_offset, u64 *val) |
ba1389b7 AK |
5258 | { |
5259 | unsigned offset = (long)_offset; | |
ba1389b7 | 5260 | struct kvm *kvm; |
536a6f88 | 5261 | u64 tmp_val; |
ba1389b7 | 5262 | |
8b88b099 | 5263 | *val = 0; |
0d9ce162 | 5264 | mutex_lock(&kvm_lock); |
536a6f88 | 5265 | list_for_each_entry(kvm, &vm_list, vm_list) { |
09cbcef6 | 5266 | kvm_get_stat_per_vm(kvm, offset, &tmp_val); |
536a6f88 JF |
5267 | *val += tmp_val; |
5268 | } | |
0d9ce162 | 5269 | mutex_unlock(&kvm_lock); |
8b88b099 | 5270 | return 0; |
ba1389b7 AK |
5271 | } |
5272 | ||
ce35ef27 SJS |
5273 | static int vm_stat_clear(void *_offset, u64 val) |
5274 | { | |
5275 | unsigned offset = (long)_offset; | |
5276 | struct kvm *kvm; | |
ce35ef27 SJS |
5277 | |
5278 | if (val) | |
5279 | return -EINVAL; | |
5280 | ||
0d9ce162 | 5281 | mutex_lock(&kvm_lock); |
ce35ef27 | 5282 | list_for_each_entry(kvm, &vm_list, vm_list) { |
09cbcef6 | 5283 | kvm_clear_stat_per_vm(kvm, offset); |
ce35ef27 | 5284 | } |
0d9ce162 | 5285 | mutex_unlock(&kvm_lock); |
ce35ef27 SJS |
5286 | |
5287 | return 0; | |
5288 | } | |
5289 | ||
5290 | DEFINE_SIMPLE_ATTRIBUTE(vm_stat_fops, vm_stat_get, vm_stat_clear, "%llu\n"); | |
bc9e9e67 | 5291 | DEFINE_SIMPLE_ATTRIBUTE(vm_stat_readonly_fops, vm_stat_get, NULL, "%llu\n"); |
ba1389b7 | 5292 | |
8b88b099 | 5293 | static int vcpu_stat_get(void *_offset, u64 *val) |
1165f5fe AK |
5294 | { |
5295 | unsigned offset = (long)_offset; | |
1165f5fe | 5296 | struct kvm *kvm; |
536a6f88 | 5297 | u64 tmp_val; |
1165f5fe | 5298 | |
8b88b099 | 5299 | *val = 0; |
0d9ce162 | 5300 | mutex_lock(&kvm_lock); |
536a6f88 | 5301 | list_for_each_entry(kvm, &vm_list, vm_list) { |
09cbcef6 | 5302 | kvm_get_stat_per_vcpu(kvm, offset, &tmp_val); |
536a6f88 JF |
5303 | *val += tmp_val; |
5304 | } | |
0d9ce162 | 5305 | mutex_unlock(&kvm_lock); |
8b88b099 | 5306 | return 0; |
1165f5fe AK |
5307 | } |
5308 | ||
ce35ef27 SJS |
5309 | static int vcpu_stat_clear(void *_offset, u64 val) |
5310 | { | |
5311 | unsigned offset = (long)_offset; | |
5312 | struct kvm *kvm; | |
ce35ef27 SJS |
5313 | |
5314 | if (val) | |
5315 | return -EINVAL; | |
5316 | ||
0d9ce162 | 5317 | mutex_lock(&kvm_lock); |
ce35ef27 | 5318 | list_for_each_entry(kvm, &vm_list, vm_list) { |
09cbcef6 | 5319 | kvm_clear_stat_per_vcpu(kvm, offset); |
ce35ef27 | 5320 | } |
0d9ce162 | 5321 | mutex_unlock(&kvm_lock); |
ce35ef27 SJS |
5322 | |
5323 | return 0; | |
5324 | } | |
5325 | ||
5326 | DEFINE_SIMPLE_ATTRIBUTE(vcpu_stat_fops, vcpu_stat_get, vcpu_stat_clear, | |
5327 | "%llu\n"); | |
bc9e9e67 | 5328 | DEFINE_SIMPLE_ATTRIBUTE(vcpu_stat_readonly_fops, vcpu_stat_get, NULL, "%llu\n"); |
1165f5fe | 5329 | |
286de8f6 CI |
5330 | static void kvm_uevent_notify_change(unsigned int type, struct kvm *kvm) |
5331 | { | |
5332 | struct kobj_uevent_env *env; | |
286de8f6 CI |
5333 | unsigned long long created, active; |
5334 | ||
5335 | if (!kvm_dev.this_device || !kvm) | |
5336 | return; | |
5337 | ||
0d9ce162 | 5338 | mutex_lock(&kvm_lock); |
286de8f6 CI |
5339 | if (type == KVM_EVENT_CREATE_VM) { |
5340 | kvm_createvm_count++; | |
5341 | kvm_active_vms++; | |
5342 | } else if (type == KVM_EVENT_DESTROY_VM) { | |
5343 | kvm_active_vms--; | |
5344 | } | |
5345 | created = kvm_createvm_count; | |
5346 | active = kvm_active_vms; | |
0d9ce162 | 5347 | mutex_unlock(&kvm_lock); |
286de8f6 | 5348 | |
b12ce36a | 5349 | env = kzalloc(sizeof(*env), GFP_KERNEL_ACCOUNT); |
286de8f6 CI |
5350 | if (!env) |
5351 | return; | |
5352 | ||
5353 | add_uevent_var(env, "CREATED=%llu", created); | |
5354 | add_uevent_var(env, "COUNT=%llu", active); | |
5355 | ||
fdeaf7e3 | 5356 | if (type == KVM_EVENT_CREATE_VM) { |
286de8f6 | 5357 | add_uevent_var(env, "EVENT=create"); |
fdeaf7e3 CI |
5358 | kvm->userspace_pid = task_pid_nr(current); |
5359 | } else if (type == KVM_EVENT_DESTROY_VM) { | |
286de8f6 | 5360 | add_uevent_var(env, "EVENT=destroy"); |
fdeaf7e3 CI |
5361 | } |
5362 | add_uevent_var(env, "PID=%d", kvm->userspace_pid); | |
286de8f6 | 5363 | |
85cd39af | 5364 | if (kvm->debugfs_dentry) { |
b12ce36a | 5365 | char *tmp, *p = kmalloc(PATH_MAX, GFP_KERNEL_ACCOUNT); |
fdeaf7e3 CI |
5366 | |
5367 | if (p) { | |
5368 | tmp = dentry_path_raw(kvm->debugfs_dentry, p, PATH_MAX); | |
5369 | if (!IS_ERR(tmp)) | |
5370 | add_uevent_var(env, "STATS_PATH=%s", tmp); | |
5371 | kfree(p); | |
286de8f6 CI |
5372 | } |
5373 | } | |
5374 | /* no need for checks, since we are adding at most only 5 keys */ | |
5375 | env->envp[env->envp_idx++] = NULL; | |
5376 | kobject_uevent_env(&kvm_dev.this_device->kobj, KOBJ_CHANGE, env->envp); | |
5377 | kfree(env); | |
286de8f6 CI |
5378 | } |
5379 | ||
929f45e3 | 5380 | static void kvm_init_debug(void) |
6aa8b732 | 5381 | { |
bc9e9e67 JZ |
5382 | const struct file_operations *fops; |
5383 | const struct _kvm_stats_desc *pdesc; | |
5384 | int i; | |
6aa8b732 | 5385 | |
76f7c879 | 5386 | kvm_debugfs_dir = debugfs_create_dir("kvm", NULL); |
4f69b680 | 5387 | |
bc9e9e67 JZ |
5388 | for (i = 0; i < kvm_vm_stats_header.num_desc; ++i) { |
5389 | pdesc = &kvm_vm_stats_desc[i]; | |
5390 | if (kvm_stats_debugfs_mode(pdesc) & 0222) | |
5391 | fops = &vm_stat_fops; | |
5392 | else | |
5393 | fops = &vm_stat_readonly_fops; | |
5394 | debugfs_create_file(pdesc->name, kvm_stats_debugfs_mode(pdesc), | |
5395 | kvm_debugfs_dir, | |
5396 | (void *)(long)pdesc->desc.offset, fops); | |
5397 | } | |
5398 | ||
5399 | for (i = 0; i < kvm_vcpu_stats_header.num_desc; ++i) { | |
5400 | pdesc = &kvm_vcpu_stats_desc[i]; | |
5401 | if (kvm_stats_debugfs_mode(pdesc) & 0222) | |
5402 | fops = &vcpu_stat_fops; | |
5403 | else | |
5404 | fops = &vcpu_stat_readonly_fops; | |
5405 | debugfs_create_file(pdesc->name, kvm_stats_debugfs_mode(pdesc), | |
5406 | kvm_debugfs_dir, | |
5407 | (void *)(long)pdesc->desc.offset, fops); | |
4f69b680 | 5408 | } |
6aa8b732 AK |
5409 | } |
5410 | ||
fb3600cc | 5411 | static int kvm_suspend(void) |
59ae6c6b | 5412 | { |
10474ae8 | 5413 | if (kvm_usage_count) |
75b7127c | 5414 | hardware_disable_nolock(NULL); |
59ae6c6b AK |
5415 | return 0; |
5416 | } | |
5417 | ||
fb3600cc | 5418 | static void kvm_resume(void) |
59ae6c6b | 5419 | { |
ca84d1a2 | 5420 | if (kvm_usage_count) { |
2eb06c30 WL |
5421 | #ifdef CONFIG_LOCKDEP |
5422 | WARN_ON(lockdep_is_held(&kvm_count_lock)); | |
5423 | #endif | |
75b7127c | 5424 | hardware_enable_nolock(NULL); |
ca84d1a2 | 5425 | } |
59ae6c6b AK |
5426 | } |
5427 | ||
fb3600cc | 5428 | static struct syscore_ops kvm_syscore_ops = { |
59ae6c6b AK |
5429 | .suspend = kvm_suspend, |
5430 | .resume = kvm_resume, | |
5431 | }; | |
5432 | ||
15ad7146 AK |
5433 | static inline |
5434 | struct kvm_vcpu *preempt_notifier_to_vcpu(struct preempt_notifier *pn) | |
5435 | { | |
5436 | return container_of(pn, struct kvm_vcpu, preempt_notifier); | |
5437 | } | |
5438 | ||
5439 | static void kvm_sched_in(struct preempt_notifier *pn, int cpu) | |
5440 | { | |
5441 | struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn); | |
f95ef0cd | 5442 | |
046ddeed | 5443 | WRITE_ONCE(vcpu->preempted, false); |
d73eb57b | 5444 | WRITE_ONCE(vcpu->ready, false); |
15ad7146 | 5445 | |
7495e22b | 5446 | __this_cpu_write(kvm_running_vcpu, vcpu); |
e790d9ef | 5447 | kvm_arch_sched_in(vcpu, cpu); |
e9b11c17 | 5448 | kvm_arch_vcpu_load(vcpu, cpu); |
15ad7146 AK |
5449 | } |
5450 | ||
5451 | static void kvm_sched_out(struct preempt_notifier *pn, | |
5452 | struct task_struct *next) | |
5453 | { | |
5454 | struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn); | |
5455 | ||
3ba9f93b | 5456 | if (current->on_rq) { |
046ddeed | 5457 | WRITE_ONCE(vcpu->preempted, true); |
d73eb57b WL |
5458 | WRITE_ONCE(vcpu->ready, true); |
5459 | } | |
e9b11c17 | 5460 | kvm_arch_vcpu_put(vcpu); |
7495e22b PB |
5461 | __this_cpu_write(kvm_running_vcpu, NULL); |
5462 | } | |
5463 | ||
5464 | /** | |
5465 | * kvm_get_running_vcpu - get the vcpu running on the current CPU. | |
1f03b2bc MZ |
5466 | * |
5467 | * We can disable preemption locally around accessing the per-CPU variable, | |
5468 | * and use the resolved vcpu pointer after enabling preemption again, | |
5469 | * because even if the current thread is migrated to another CPU, reading | |
5470 | * the per-CPU value later will give us the same value as we update the | |
5471 | * per-CPU variable in the preempt notifier handlers. | |
7495e22b PB |
5472 | */ |
5473 | struct kvm_vcpu *kvm_get_running_vcpu(void) | |
5474 | { | |
1f03b2bc MZ |
5475 | struct kvm_vcpu *vcpu; |
5476 | ||
5477 | preempt_disable(); | |
5478 | vcpu = __this_cpu_read(kvm_running_vcpu); | |
5479 | preempt_enable(); | |
5480 | ||
5481 | return vcpu; | |
7495e22b | 5482 | } |
379a3c8e | 5483 | EXPORT_SYMBOL_GPL(kvm_get_running_vcpu); |
7495e22b PB |
5484 | |
5485 | /** | |
5486 | * kvm_get_running_vcpus - get the per-CPU array of currently running vcpus. | |
5487 | */ | |
5488 | struct kvm_vcpu * __percpu *kvm_get_running_vcpus(void) | |
5489 | { | |
5490 | return &kvm_running_vcpu; | |
15ad7146 AK |
5491 | } |
5492 | ||
b9904085 SC |
5493 | struct kvm_cpu_compat_check { |
5494 | void *opaque; | |
5495 | int *ret; | |
5496 | }; | |
5497 | ||
5498 | static void check_processor_compat(void *data) | |
f257d6dc | 5499 | { |
b9904085 SC |
5500 | struct kvm_cpu_compat_check *c = data; |
5501 | ||
5502 | *c->ret = kvm_arch_check_processor_compat(c->opaque); | |
f257d6dc SC |
5503 | } |
5504 | ||
0ee75bea | 5505 | int kvm_init(void *opaque, unsigned vcpu_size, unsigned vcpu_align, |
c16f862d | 5506 | struct module *module) |
6aa8b732 | 5507 | { |
b9904085 | 5508 | struct kvm_cpu_compat_check c; |
6aa8b732 | 5509 | int r; |
002c7f7c | 5510 | int cpu; |
6aa8b732 | 5511 | |
f8c16bba ZX |
5512 | r = kvm_arch_init(opaque); |
5513 | if (r) | |
d2308784 | 5514 | goto out_fail; |
cb498ea2 | 5515 | |
7dac16c3 AH |
5516 | /* |
5517 | * kvm_arch_init makes sure there's at most one caller | |
5518 | * for architectures that support multiple implementations, | |
5519 | * like intel and amd on x86. | |
36343f6e PB |
5520 | * kvm_arch_init must be called before kvm_irqfd_init to avoid creating |
5521 | * conflicts in case kvm is already setup for another implementation. | |
7dac16c3 | 5522 | */ |
36343f6e PB |
5523 | r = kvm_irqfd_init(); |
5524 | if (r) | |
5525 | goto out_irqfd; | |
7dac16c3 | 5526 | |
8437a617 | 5527 | if (!zalloc_cpumask_var(&cpus_hardware_enabled, GFP_KERNEL)) { |
7f59f492 RR |
5528 | r = -ENOMEM; |
5529 | goto out_free_0; | |
5530 | } | |
5531 | ||
b9904085 | 5532 | r = kvm_arch_hardware_setup(opaque); |
6aa8b732 | 5533 | if (r < 0) |
faf0be22 | 5534 | goto out_free_1; |
6aa8b732 | 5535 | |
b9904085 SC |
5536 | c.ret = &r; |
5537 | c.opaque = opaque; | |
002c7f7c | 5538 | for_each_online_cpu(cpu) { |
b9904085 | 5539 | smp_call_function_single(cpu, check_processor_compat, &c, 1); |
002c7f7c | 5540 | if (r < 0) |
faf0be22 | 5541 | goto out_free_2; |
002c7f7c YS |
5542 | } |
5543 | ||
73c1b41e | 5544 | r = cpuhp_setup_state_nocalls(CPUHP_AP_KVM_STARTING, "kvm/cpu:starting", |
8c18b2d2 | 5545 | kvm_starting_cpu, kvm_dying_cpu); |
774c47f1 | 5546 | if (r) |
d2308784 | 5547 | goto out_free_2; |
6aa8b732 AK |
5548 | register_reboot_notifier(&kvm_reboot_notifier); |
5549 | ||
c16f862d | 5550 | /* A kmem cache lets us meet the alignment requirements of fx_save. */ |
0ee75bea AK |
5551 | if (!vcpu_align) |
5552 | vcpu_align = __alignof__(struct kvm_vcpu); | |
46515736 PB |
5553 | kvm_vcpu_cache = |
5554 | kmem_cache_create_usercopy("kvm_vcpu", vcpu_size, vcpu_align, | |
5555 | SLAB_ACCOUNT, | |
5556 | offsetof(struct kvm_vcpu, arch), | |
ce55c049 JZ |
5557 | offsetofend(struct kvm_vcpu, stats_id) |
5558 | - offsetof(struct kvm_vcpu, arch), | |
46515736 | 5559 | NULL); |
c16f862d RR |
5560 | if (!kvm_vcpu_cache) { |
5561 | r = -ENOMEM; | |
fb3600cc | 5562 | goto out_free_3; |
c16f862d RR |
5563 | } |
5564 | ||
baff59cc VK |
5565 | for_each_possible_cpu(cpu) { |
5566 | if (!alloc_cpumask_var_node(&per_cpu(cpu_kick_mask, cpu), | |
5567 | GFP_KERNEL, cpu_to_node(cpu))) { | |
5568 | r = -ENOMEM; | |
5569 | goto out_free_4; | |
5570 | } | |
5571 | } | |
5572 | ||
af585b92 GN |
5573 | r = kvm_async_pf_init(); |
5574 | if (r) | |
baff59cc | 5575 | goto out_free_5; |
af585b92 | 5576 | |
6aa8b732 | 5577 | kvm_chardev_ops.owner = module; |
3d3aab1b CB |
5578 | kvm_vm_fops.owner = module; |
5579 | kvm_vcpu_fops.owner = module; | |
6aa8b732 AK |
5580 | |
5581 | r = misc_register(&kvm_dev); | |
5582 | if (r) { | |
1170adc6 | 5583 | pr_err("kvm: misc device register failed\n"); |
af585b92 | 5584 | goto out_unreg; |
6aa8b732 AK |
5585 | } |
5586 | ||
fb3600cc RW |
5587 | register_syscore_ops(&kvm_syscore_ops); |
5588 | ||
15ad7146 AK |
5589 | kvm_preempt_ops.sched_in = kvm_sched_in; |
5590 | kvm_preempt_ops.sched_out = kvm_sched_out; | |
5591 | ||
929f45e3 | 5592 | kvm_init_debug(); |
0ea4ed8e | 5593 | |
3c3c29fd PB |
5594 | r = kvm_vfio_ops_init(); |
5595 | WARN_ON(r); | |
5596 | ||
c7addb90 | 5597 | return 0; |
6aa8b732 | 5598 | |
af585b92 GN |
5599 | out_unreg: |
5600 | kvm_async_pf_deinit(); | |
baff59cc VK |
5601 | out_free_5: |
5602 | for_each_possible_cpu(cpu) | |
5603 | free_cpumask_var(per_cpu(cpu_kick_mask, cpu)); | |
5604 | out_free_4: | |
c16f862d | 5605 | kmem_cache_destroy(kvm_vcpu_cache); |
d2308784 | 5606 | out_free_3: |
6aa8b732 | 5607 | unregister_reboot_notifier(&kvm_reboot_notifier); |
8c18b2d2 | 5608 | cpuhp_remove_state_nocalls(CPUHP_AP_KVM_STARTING); |
d2308784 | 5609 | out_free_2: |
e9b11c17 | 5610 | kvm_arch_hardware_unsetup(); |
faf0be22 | 5611 | out_free_1: |
7f59f492 | 5612 | free_cpumask_var(cpus_hardware_enabled); |
d2308784 | 5613 | out_free_0: |
a0f155e9 | 5614 | kvm_irqfd_exit(); |
36343f6e | 5615 | out_irqfd: |
7dac16c3 AH |
5616 | kvm_arch_exit(); |
5617 | out_fail: | |
6aa8b732 AK |
5618 | return r; |
5619 | } | |
cb498ea2 | 5620 | EXPORT_SYMBOL_GPL(kvm_init); |
6aa8b732 | 5621 | |
cb498ea2 | 5622 | void kvm_exit(void) |
6aa8b732 | 5623 | { |
baff59cc VK |
5624 | int cpu; |
5625 | ||
4bd33b56 | 5626 | debugfs_remove_recursive(kvm_debugfs_dir); |
6aa8b732 | 5627 | misc_deregister(&kvm_dev); |
baff59cc VK |
5628 | for_each_possible_cpu(cpu) |
5629 | free_cpumask_var(per_cpu(cpu_kick_mask, cpu)); | |
c16f862d | 5630 | kmem_cache_destroy(kvm_vcpu_cache); |
af585b92 | 5631 | kvm_async_pf_deinit(); |
fb3600cc | 5632 | unregister_syscore_ops(&kvm_syscore_ops); |
6aa8b732 | 5633 | unregister_reboot_notifier(&kvm_reboot_notifier); |
8c18b2d2 | 5634 | cpuhp_remove_state_nocalls(CPUHP_AP_KVM_STARTING); |
75b7127c | 5635 | on_each_cpu(hardware_disable_nolock, NULL, 1); |
e9b11c17 | 5636 | kvm_arch_hardware_unsetup(); |
f8c16bba | 5637 | kvm_arch_exit(); |
a0f155e9 | 5638 | kvm_irqfd_exit(); |
7f59f492 | 5639 | free_cpumask_var(cpus_hardware_enabled); |
571ee1b6 | 5640 | kvm_vfio_ops_exit(); |
6aa8b732 | 5641 | } |
cb498ea2 | 5642 | EXPORT_SYMBOL_GPL(kvm_exit); |
c57c8046 JS |
5643 | |
5644 | struct kvm_vm_worker_thread_context { | |
5645 | struct kvm *kvm; | |
5646 | struct task_struct *parent; | |
5647 | struct completion init_done; | |
5648 | kvm_vm_thread_fn_t thread_fn; | |
5649 | uintptr_t data; | |
5650 | int err; | |
5651 | }; | |
5652 | ||
5653 | static int kvm_vm_worker_thread(void *context) | |
5654 | { | |
5655 | /* | |
5656 | * The init_context is allocated on the stack of the parent thread, so | |
5657 | * we have to locally copy anything that is needed beyond initialization | |
5658 | */ | |
5659 | struct kvm_vm_worker_thread_context *init_context = context; | |
5660 | struct kvm *kvm = init_context->kvm; | |
5661 | kvm_vm_thread_fn_t thread_fn = init_context->thread_fn; | |
5662 | uintptr_t data = init_context->data; | |
5663 | int err; | |
5664 | ||
5665 | err = kthread_park(current); | |
5666 | /* kthread_park(current) is never supposed to return an error */ | |
5667 | WARN_ON(err != 0); | |
5668 | if (err) | |
5669 | goto init_complete; | |
5670 | ||
5671 | err = cgroup_attach_task_all(init_context->parent, current); | |
5672 | if (err) { | |
5673 | kvm_err("%s: cgroup_attach_task_all failed with err %d\n", | |
5674 | __func__, err); | |
5675 | goto init_complete; | |
5676 | } | |
5677 | ||
5678 | set_user_nice(current, task_nice(init_context->parent)); | |
5679 | ||
5680 | init_complete: | |
5681 | init_context->err = err; | |
5682 | complete(&init_context->init_done); | |
5683 | init_context = NULL; | |
5684 | ||
5685 | if (err) | |
5686 | return err; | |
5687 | ||
5688 | /* Wait to be woken up by the spawner before proceeding. */ | |
5689 | kthread_parkme(); | |
5690 | ||
5691 | if (!kthread_should_stop()) | |
5692 | err = thread_fn(kvm, data); | |
5693 | ||
5694 | return err; | |
5695 | } | |
5696 | ||
5697 | int kvm_vm_create_worker_thread(struct kvm *kvm, kvm_vm_thread_fn_t thread_fn, | |
5698 | uintptr_t data, const char *name, | |
5699 | struct task_struct **thread_ptr) | |
5700 | { | |
5701 | struct kvm_vm_worker_thread_context init_context = {}; | |
5702 | struct task_struct *thread; | |
5703 | ||
5704 | *thread_ptr = NULL; | |
5705 | init_context.kvm = kvm; | |
5706 | init_context.parent = current; | |
5707 | init_context.thread_fn = thread_fn; | |
5708 | init_context.data = data; | |
5709 | init_completion(&init_context.init_done); | |
5710 | ||
5711 | thread = kthread_run(kvm_vm_worker_thread, &init_context, | |
5712 | "%s-%d", name, task_pid_nr(current)); | |
5713 | if (IS_ERR(thread)) | |
5714 | return PTR_ERR(thread); | |
5715 | ||
5716 | /* kthread_run is never supposed to return NULL */ | |
5717 | WARN_ON(thread == NULL); | |
5718 | ||
5719 | wait_for_completion(&init_context.init_done); | |
5720 | ||
5721 | if (!init_context.err) | |
5722 | *thread_ptr = thread; | |
5723 | ||
5724 | return init_context.err; | |
5725 | } |