1 // SPDX-License-Identifier: GPL-2.0-only
3 * Kernel-based Virtual Machine driver for Linux
5 * This module enables machines with Intel VT-x extensions to run virtual
6 * machines without emulation or binary translation.
8 * Copyright (C) 2006 Qumranet, Inc.
9 * Copyright 2010 Red Hat, Inc. and/or its affiliates.
12 * Avi Kivity <avi@qumranet.com>
13 * Yaniv Kamay <yaniv@qumranet.com>
16 #include <kvm/iodev.h>
18 #include <linux/kvm_host.h>
19 #include <linux/kvm.h>
20 #include <linux/module.h>
21 #include <linux/errno.h>
22 #include <linux/percpu.h>
24 #include <linux/miscdevice.h>
25 #include <linux/vmalloc.h>
26 #include <linux/reboot.h>
27 #include <linux/debugfs.h>
28 #include <linux/highmem.h>
29 #include <linux/file.h>
30 #include <linux/syscore_ops.h>
31 #include <linux/cpu.h>
32 #include <linux/sched/signal.h>
33 #include <linux/sched/mm.h>
34 #include <linux/sched/stat.h>
35 #include <linux/cpumask.h>
36 #include <linux/smp.h>
37 #include <linux/anon_inodes.h>
38 #include <linux/profile.h>
39 #include <linux/kvm_para.h>
40 #include <linux/pagemap.h>
41 #include <linux/mman.h>
42 #include <linux/swap.h>
43 #include <linux/bitops.h>
44 #include <linux/spinlock.h>
45 #include <linux/compat.h>
46 #include <linux/srcu.h>
47 #include <linux/hugetlb.h>
48 #include <linux/slab.h>
49 #include <linux/sort.h>
50 #include <linux/bsearch.h>
52 #include <linux/lockdep.h>
53 #include <linux/kthread.h>
55 #include <asm/processor.h>
56 #include <asm/ioctl.h>
57 #include <linux/uaccess.h>
58 #include <asm/pgtable.h>
60 #include "coalesced_mmio.h"
64 #define CREATE_TRACE_POINTS
65 #include <trace/events/kvm.h>
67 /* Worst case buffer size needed for holding an integer. */
68 #define ITOA_MAX_LEN 12
70 MODULE_AUTHOR("Qumranet");
71 MODULE_LICENSE("GPL");
73 /* Architectures should define their poll value according to the halt latency */
74 unsigned int halt_poll_ns
= KVM_HALT_POLL_NS_DEFAULT
;
75 module_param(halt_poll_ns
, uint
, 0644);
76 EXPORT_SYMBOL_GPL(halt_poll_ns
);
78 /* Default doubles per-vcpu halt_poll_ns. */
79 unsigned int halt_poll_ns_grow
= 2;
80 module_param(halt_poll_ns_grow
, uint
, 0644);
81 EXPORT_SYMBOL_GPL(halt_poll_ns_grow
);
83 /* The start value to grow halt_poll_ns from */
84 unsigned int halt_poll_ns_grow_start
= 10000; /* 10us */
85 module_param(halt_poll_ns_grow_start
, uint
, 0644);
86 EXPORT_SYMBOL_GPL(halt_poll_ns_grow_start
);
88 /* Default resets per-vcpu halt_poll_ns . */
89 unsigned int halt_poll_ns_shrink
;
90 module_param(halt_poll_ns_shrink
, uint
, 0644);
91 EXPORT_SYMBOL_GPL(halt_poll_ns_shrink
);
96 * kvm->lock --> kvm->slots_lock --> kvm->irq_lock
99 DEFINE_MUTEX(kvm_lock
);
100 static DEFINE_RAW_SPINLOCK(kvm_count_lock
);
103 static cpumask_var_t cpus_hardware_enabled
;
104 static int kvm_usage_count
;
105 static atomic_t hardware_enable_failed
;
107 static struct kmem_cache
*kvm_vcpu_cache
;
109 static __read_mostly
struct preempt_ops kvm_preempt_ops
;
110 static DEFINE_PER_CPU(struct kvm_vcpu
*, kvm_running_vcpu
);
112 struct dentry
*kvm_debugfs_dir
;
113 EXPORT_SYMBOL_GPL(kvm_debugfs_dir
);
115 static int kvm_debugfs_num_entries
;
116 static const struct file_operations stat_fops_per_vm
;
118 static long kvm_vcpu_ioctl(struct file
*file
, unsigned int ioctl
,
120 #ifdef CONFIG_KVM_COMPAT
121 static long kvm_vcpu_compat_ioctl(struct file
*file
, unsigned int ioctl
,
123 #define KVM_COMPAT(c) .compat_ioctl = (c)
126 * For architectures that don't implement a compat infrastructure,
127 * adopt a double line of defense:
128 * - Prevent a compat task from opening /dev/kvm
129 * - If the open has been done by a 64bit task, and the KVM fd
130 * passed to a compat task, let the ioctls fail.
132 static long kvm_no_compat_ioctl(struct file
*file
, unsigned int ioctl
,
133 unsigned long arg
) { return -EINVAL
; }
135 static int kvm_no_compat_open(struct inode
*inode
, struct file
*file
)
137 return is_compat_task() ? -ENODEV
: 0;
139 #define KVM_COMPAT(c) .compat_ioctl = kvm_no_compat_ioctl, \
140 .open = kvm_no_compat_open
142 static int hardware_enable_all(void);
143 static void hardware_disable_all(void);
145 static void kvm_io_bus_destroy(struct kvm_io_bus
*bus
);
147 static void mark_page_dirty_in_slot(struct kvm_memory_slot
*memslot
, gfn_t gfn
);
149 __visible
bool kvm_rebooting
;
150 EXPORT_SYMBOL_GPL(kvm_rebooting
);
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
;
158 __weak
int kvm_arch_mmu_notifier_invalidate_range(struct kvm
*kvm
,
159 unsigned long start
, unsigned long end
, bool blockable
)
164 bool kvm_is_zone_device_pfn(kvm_pfn_t pfn
)
167 * The metadata used by is_zone_device_page() to determine whether or
168 * not a page is ZONE_DEVICE is guaranteed to be valid if and only if
169 * the device has been pinned, e.g. by get_user_pages(). WARN if the
170 * page_count() is zero to help detect bad usage of this helper.
172 if (!pfn_valid(pfn
) || WARN_ON_ONCE(!page_count(pfn_to_page(pfn
))))
175 return is_zone_device_page(pfn_to_page(pfn
));
178 bool kvm_is_reserved_pfn(kvm_pfn_t pfn
)
181 * ZONE_DEVICE pages currently set PG_reserved, but from a refcounting
182 * perspective they are "normal" pages, albeit with slightly different
186 return PageReserved(pfn_to_page(pfn
)) &&
188 !kvm_is_zone_device_pfn(pfn
);
193 bool kvm_is_transparent_hugepage(kvm_pfn_t pfn
)
195 struct page
*page
= pfn_to_page(pfn
);
197 if (!PageTransCompoundMap(page
))
200 return is_transparent_hugepage(compound_head(page
));
204 * Switches to specified vcpu, until a matching vcpu_put()
206 void vcpu_load(struct kvm_vcpu
*vcpu
)
210 __this_cpu_write(kvm_running_vcpu
, vcpu
);
211 preempt_notifier_register(&vcpu
->preempt_notifier
);
212 kvm_arch_vcpu_load(vcpu
, cpu
);
215 EXPORT_SYMBOL_GPL(vcpu_load
);
217 void vcpu_put(struct kvm_vcpu
*vcpu
)
220 kvm_arch_vcpu_put(vcpu
);
221 preempt_notifier_unregister(&vcpu
->preempt_notifier
);
222 __this_cpu_write(kvm_running_vcpu
, NULL
);
225 EXPORT_SYMBOL_GPL(vcpu_put
);
227 /* TODO: merge with kvm_arch_vcpu_should_kick */
228 static bool kvm_request_needs_ipi(struct kvm_vcpu
*vcpu
, unsigned req
)
230 int mode
= kvm_vcpu_exiting_guest_mode(vcpu
);
233 * We need to wait for the VCPU to reenable interrupts and get out of
234 * READING_SHADOW_PAGE_TABLES mode.
236 if (req
& KVM_REQUEST_WAIT
)
237 return mode
!= OUTSIDE_GUEST_MODE
;
240 * Need to kick a running VCPU, but otherwise there is nothing to do.
242 return mode
== IN_GUEST_MODE
;
245 static void ack_flush(void *_completed
)
249 static inline bool kvm_kick_many_cpus(const struct cpumask
*cpus
, bool wait
)
252 cpus
= cpu_online_mask
;
254 if (cpumask_empty(cpus
))
257 smp_call_function_many(cpus
, ack_flush
, NULL
, wait
);
261 bool kvm_make_vcpus_request_mask(struct kvm
*kvm
, unsigned int req
,
262 struct kvm_vcpu
*except
,
263 unsigned long *vcpu_bitmap
, cpumask_var_t tmp
)
266 struct kvm_vcpu
*vcpu
;
271 kvm_for_each_vcpu(i
, vcpu
, kvm
) {
272 if ((vcpu_bitmap
&& !test_bit(i
, vcpu_bitmap
)) ||
276 kvm_make_request(req
, vcpu
);
279 if (!(req
& KVM_REQUEST_NO_WAKEUP
) && kvm_vcpu_wake_up(vcpu
))
282 if (tmp
!= NULL
&& cpu
!= -1 && cpu
!= me
&&
283 kvm_request_needs_ipi(vcpu
, req
))
284 __cpumask_set_cpu(cpu
, tmp
);
287 called
= kvm_kick_many_cpus(tmp
, !!(req
& KVM_REQUEST_WAIT
));
293 bool kvm_make_all_cpus_request_except(struct kvm
*kvm
, unsigned int req
,
294 struct kvm_vcpu
*except
)
299 zalloc_cpumask_var(&cpus
, GFP_ATOMIC
);
301 called
= kvm_make_vcpus_request_mask(kvm
, req
, except
, NULL
, cpus
);
303 free_cpumask_var(cpus
);
307 bool kvm_make_all_cpus_request(struct kvm
*kvm
, unsigned int req
)
309 return kvm_make_all_cpus_request_except(kvm
, req
, NULL
);
312 #ifndef CONFIG_HAVE_KVM_ARCH_TLB_FLUSH_ALL
313 void kvm_flush_remote_tlbs(struct kvm
*kvm
)
316 * Read tlbs_dirty before setting KVM_REQ_TLB_FLUSH in
317 * kvm_make_all_cpus_request.
319 long dirty_count
= smp_load_acquire(&kvm
->tlbs_dirty
);
322 * We want to publish modifications to the page tables before reading
323 * mode. Pairs with a memory barrier in arch-specific code.
324 * - x86: smp_mb__after_srcu_read_unlock in vcpu_enter_guest
325 * and smp_mb in walk_shadow_page_lockless_begin/end.
326 * - powerpc: smp_mb in kvmppc_prepare_to_enter.
328 * There is already an smp_mb__after_atomic() before
329 * kvm_make_all_cpus_request() reads vcpu->mode. We reuse that
332 if (!kvm_arch_flush_remote_tlb(kvm
)
333 || kvm_make_all_cpus_request(kvm
, KVM_REQ_TLB_FLUSH
))
334 ++kvm
->stat
.remote_tlb_flush
;
335 cmpxchg(&kvm
->tlbs_dirty
, dirty_count
, 0);
337 EXPORT_SYMBOL_GPL(kvm_flush_remote_tlbs
);
340 void kvm_reload_remote_mmus(struct kvm
*kvm
)
342 kvm_make_all_cpus_request(kvm
, KVM_REQ_MMU_RELOAD
);
345 static void kvm_vcpu_init(struct kvm_vcpu
*vcpu
, struct kvm
*kvm
, unsigned id
)
347 mutex_init(&vcpu
->mutex
);
352 init_swait_queue_head(&vcpu
->wq
);
353 kvm_async_pf_vcpu_init(vcpu
);
356 INIT_LIST_HEAD(&vcpu
->blocked_vcpu_list
);
358 kvm_vcpu_set_in_spin_loop(vcpu
, false);
359 kvm_vcpu_set_dy_eligible(vcpu
, false);
360 vcpu
->preempted
= false;
362 preempt_notifier_init(&vcpu
->preempt_notifier
, &kvm_preempt_ops
);
365 void kvm_vcpu_destroy(struct kvm_vcpu
*vcpu
)
367 kvm_arch_vcpu_destroy(vcpu
);
370 * No need for rcu_read_lock as VCPU_RUN is the only place that changes
371 * the vcpu->pid pointer, and at destruction time all file descriptors
374 put_pid(rcu_dereference_protected(vcpu
->pid
, 1));
376 free_page((unsigned long)vcpu
->run
);
377 kmem_cache_free(kvm_vcpu_cache
, vcpu
);
379 EXPORT_SYMBOL_GPL(kvm_vcpu_destroy
);
381 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
382 static inline struct kvm
*mmu_notifier_to_kvm(struct mmu_notifier
*mn
)
384 return container_of(mn
, struct kvm
, mmu_notifier
);
387 static void kvm_mmu_notifier_change_pte(struct mmu_notifier
*mn
,
388 struct mm_struct
*mm
,
389 unsigned long address
,
392 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
395 idx
= srcu_read_lock(&kvm
->srcu
);
396 spin_lock(&kvm
->mmu_lock
);
397 kvm
->mmu_notifier_seq
++;
399 if (kvm_set_spte_hva(kvm
, address
, pte
))
400 kvm_flush_remote_tlbs(kvm
);
402 spin_unlock(&kvm
->mmu_lock
);
403 srcu_read_unlock(&kvm
->srcu
, idx
);
406 static int kvm_mmu_notifier_invalidate_range_start(struct mmu_notifier
*mn
,
407 const struct mmu_notifier_range
*range
)
409 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
410 int need_tlb_flush
= 0, idx
;
413 idx
= srcu_read_lock(&kvm
->srcu
);
414 spin_lock(&kvm
->mmu_lock
);
416 * The count increase must become visible at unlock time as no
417 * spte can be established without taking the mmu_lock and
418 * count is also read inside the mmu_lock critical section.
420 kvm
->mmu_notifier_count
++;
421 need_tlb_flush
= kvm_unmap_hva_range(kvm
, range
->start
, range
->end
);
422 need_tlb_flush
|= kvm
->tlbs_dirty
;
423 /* we've to flush the tlb before the pages can be freed */
425 kvm_flush_remote_tlbs(kvm
);
427 spin_unlock(&kvm
->mmu_lock
);
429 ret
= kvm_arch_mmu_notifier_invalidate_range(kvm
, range
->start
,
431 mmu_notifier_range_blockable(range
));
433 srcu_read_unlock(&kvm
->srcu
, idx
);
438 static void kvm_mmu_notifier_invalidate_range_end(struct mmu_notifier
*mn
,
439 const struct mmu_notifier_range
*range
)
441 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
443 spin_lock(&kvm
->mmu_lock
);
445 * This sequence increase will notify the kvm page fault that
446 * the page that is going to be mapped in the spte could have
449 kvm
->mmu_notifier_seq
++;
452 * The above sequence increase must be visible before the
453 * below count decrease, which is ensured by the smp_wmb above
454 * in conjunction with the smp_rmb in mmu_notifier_retry().
456 kvm
->mmu_notifier_count
--;
457 spin_unlock(&kvm
->mmu_lock
);
459 BUG_ON(kvm
->mmu_notifier_count
< 0);
462 static int kvm_mmu_notifier_clear_flush_young(struct mmu_notifier
*mn
,
463 struct mm_struct
*mm
,
467 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
470 idx
= srcu_read_lock(&kvm
->srcu
);
471 spin_lock(&kvm
->mmu_lock
);
473 young
= kvm_age_hva(kvm
, start
, end
);
475 kvm_flush_remote_tlbs(kvm
);
477 spin_unlock(&kvm
->mmu_lock
);
478 srcu_read_unlock(&kvm
->srcu
, idx
);
483 static int kvm_mmu_notifier_clear_young(struct mmu_notifier
*mn
,
484 struct mm_struct
*mm
,
488 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
491 idx
= srcu_read_lock(&kvm
->srcu
);
492 spin_lock(&kvm
->mmu_lock
);
494 * Even though we do not flush TLB, this will still adversely
495 * affect performance on pre-Haswell Intel EPT, where there is
496 * no EPT Access Bit to clear so that we have to tear down EPT
497 * tables instead. If we find this unacceptable, we can always
498 * add a parameter to kvm_age_hva so that it effectively doesn't
499 * do anything on clear_young.
501 * Also note that currently we never issue secondary TLB flushes
502 * from clear_young, leaving this job up to the regular system
503 * cadence. If we find this inaccurate, we might come up with a
504 * more sophisticated heuristic later.
506 young
= kvm_age_hva(kvm
, start
, end
);
507 spin_unlock(&kvm
->mmu_lock
);
508 srcu_read_unlock(&kvm
->srcu
, idx
);
513 static int kvm_mmu_notifier_test_young(struct mmu_notifier
*mn
,
514 struct mm_struct
*mm
,
515 unsigned long address
)
517 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
520 idx
= srcu_read_lock(&kvm
->srcu
);
521 spin_lock(&kvm
->mmu_lock
);
522 young
= kvm_test_age_hva(kvm
, address
);
523 spin_unlock(&kvm
->mmu_lock
);
524 srcu_read_unlock(&kvm
->srcu
, idx
);
529 static void kvm_mmu_notifier_release(struct mmu_notifier
*mn
,
530 struct mm_struct
*mm
)
532 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
535 idx
= srcu_read_lock(&kvm
->srcu
);
536 kvm_arch_flush_shadow_all(kvm
);
537 srcu_read_unlock(&kvm
->srcu
, idx
);
540 static const struct mmu_notifier_ops kvm_mmu_notifier_ops
= {
541 .invalidate_range_start
= kvm_mmu_notifier_invalidate_range_start
,
542 .invalidate_range_end
= kvm_mmu_notifier_invalidate_range_end
,
543 .clear_flush_young
= kvm_mmu_notifier_clear_flush_young
,
544 .clear_young
= kvm_mmu_notifier_clear_young
,
545 .test_young
= kvm_mmu_notifier_test_young
,
546 .change_pte
= kvm_mmu_notifier_change_pte
,
547 .release
= kvm_mmu_notifier_release
,
550 static int kvm_init_mmu_notifier(struct kvm
*kvm
)
552 kvm
->mmu_notifier
.ops
= &kvm_mmu_notifier_ops
;
553 return mmu_notifier_register(&kvm
->mmu_notifier
, current
->mm
);
556 #else /* !(CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER) */
558 static int kvm_init_mmu_notifier(struct kvm
*kvm
)
563 #endif /* CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER */
565 static struct kvm_memslots
*kvm_alloc_memslots(void)
568 struct kvm_memslots
*slots
;
570 slots
= kvzalloc(sizeof(struct kvm_memslots
), GFP_KERNEL_ACCOUNT
);
574 for (i
= 0; i
< KVM_MEM_SLOTS_NUM
; i
++)
575 slots
->id_to_index
[i
] = -1;
580 static void kvm_destroy_dirty_bitmap(struct kvm_memory_slot
*memslot
)
582 if (!memslot
->dirty_bitmap
)
585 kvfree(memslot
->dirty_bitmap
);
586 memslot
->dirty_bitmap
= NULL
;
589 static void kvm_free_memslot(struct kvm
*kvm
, struct kvm_memory_slot
*slot
)
591 kvm_destroy_dirty_bitmap(slot
);
593 kvm_arch_free_memslot(kvm
, slot
);
599 static void kvm_free_memslots(struct kvm
*kvm
, struct kvm_memslots
*slots
)
601 struct kvm_memory_slot
*memslot
;
606 kvm_for_each_memslot(memslot
, slots
)
607 kvm_free_memslot(kvm
, memslot
);
612 static void kvm_destroy_vm_debugfs(struct kvm
*kvm
)
616 if (!kvm
->debugfs_dentry
)
619 debugfs_remove_recursive(kvm
->debugfs_dentry
);
621 if (kvm
->debugfs_stat_data
) {
622 for (i
= 0; i
< kvm_debugfs_num_entries
; i
++)
623 kfree(kvm
->debugfs_stat_data
[i
]);
624 kfree(kvm
->debugfs_stat_data
);
628 static int kvm_create_vm_debugfs(struct kvm
*kvm
, int fd
)
630 char dir_name
[ITOA_MAX_LEN
* 2];
631 struct kvm_stat_data
*stat_data
;
632 struct kvm_stats_debugfs_item
*p
;
634 if (!debugfs_initialized())
637 snprintf(dir_name
, sizeof(dir_name
), "%d-%d", task_pid_nr(current
), fd
);
638 kvm
->debugfs_dentry
= debugfs_create_dir(dir_name
, kvm_debugfs_dir
);
640 kvm
->debugfs_stat_data
= kcalloc(kvm_debugfs_num_entries
,
641 sizeof(*kvm
->debugfs_stat_data
),
643 if (!kvm
->debugfs_stat_data
)
646 for (p
= debugfs_entries
; p
->name
; p
++) {
647 stat_data
= kzalloc(sizeof(*stat_data
), GFP_KERNEL_ACCOUNT
);
651 stat_data
->kvm
= kvm
;
652 stat_data
->dbgfs_item
= p
;
653 kvm
->debugfs_stat_data
[p
- debugfs_entries
] = stat_data
;
654 debugfs_create_file(p
->name
, KVM_DBGFS_GET_MODE(p
),
655 kvm
->debugfs_dentry
, stat_data
,
662 * Called after the VM is otherwise initialized, but just before adding it to
665 int __weak
kvm_arch_post_init_vm(struct kvm
*kvm
)
671 * Called just after removing the VM from the vm_list, but before doing any
674 void __weak
kvm_arch_pre_destroy_vm(struct kvm
*kvm
)
678 static struct kvm
*kvm_create_vm(unsigned long type
)
680 struct kvm
*kvm
= kvm_arch_alloc_vm();
685 return ERR_PTR(-ENOMEM
);
687 spin_lock_init(&kvm
->mmu_lock
);
689 kvm
->mm
= current
->mm
;
690 kvm_eventfd_init(kvm
);
691 mutex_init(&kvm
->lock
);
692 mutex_init(&kvm
->irq_lock
);
693 mutex_init(&kvm
->slots_lock
);
694 INIT_LIST_HEAD(&kvm
->devices
);
696 BUILD_BUG_ON(KVM_MEM_SLOTS_NUM
> SHRT_MAX
);
698 if (init_srcu_struct(&kvm
->srcu
))
699 goto out_err_no_srcu
;
700 if (init_srcu_struct(&kvm
->irq_srcu
))
701 goto out_err_no_irq_srcu
;
703 refcount_set(&kvm
->users_count
, 1);
704 for (i
= 0; i
< KVM_ADDRESS_SPACE_NUM
; i
++) {
705 struct kvm_memslots
*slots
= kvm_alloc_memslots();
708 goto out_err_no_arch_destroy_vm
;
709 /* Generations must be different for each address space. */
710 slots
->generation
= i
;
711 rcu_assign_pointer(kvm
->memslots
[i
], slots
);
714 for (i
= 0; i
< KVM_NR_BUSES
; i
++) {
715 rcu_assign_pointer(kvm
->buses
[i
],
716 kzalloc(sizeof(struct kvm_io_bus
), GFP_KERNEL_ACCOUNT
));
718 goto out_err_no_arch_destroy_vm
;
721 r
= kvm_arch_init_vm(kvm
, type
);
723 goto out_err_no_arch_destroy_vm
;
725 r
= hardware_enable_all();
727 goto out_err_no_disable
;
729 #ifdef CONFIG_HAVE_KVM_IRQFD
730 INIT_HLIST_HEAD(&kvm
->irq_ack_notifier_list
);
733 r
= kvm_init_mmu_notifier(kvm
);
735 goto out_err_no_mmu_notifier
;
737 r
= kvm_arch_post_init_vm(kvm
);
741 mutex_lock(&kvm_lock
);
742 list_add(&kvm
->vm_list
, &vm_list
);
743 mutex_unlock(&kvm_lock
);
745 preempt_notifier_inc();
750 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
751 if (kvm
->mmu_notifier
.ops
)
752 mmu_notifier_unregister(&kvm
->mmu_notifier
, current
->mm
);
754 out_err_no_mmu_notifier
:
755 hardware_disable_all();
757 kvm_arch_destroy_vm(kvm
);
758 out_err_no_arch_destroy_vm
:
759 WARN_ON_ONCE(!refcount_dec_and_test(&kvm
->users_count
));
760 for (i
= 0; i
< KVM_NR_BUSES
; i
++)
761 kfree(kvm_get_bus(kvm
, i
));
762 for (i
= 0; i
< KVM_ADDRESS_SPACE_NUM
; i
++)
763 kvm_free_memslots(kvm
, __kvm_memslots(kvm
, i
));
764 cleanup_srcu_struct(&kvm
->irq_srcu
);
766 cleanup_srcu_struct(&kvm
->srcu
);
768 kvm_arch_free_vm(kvm
);
773 static void kvm_destroy_devices(struct kvm
*kvm
)
775 struct kvm_device
*dev
, *tmp
;
778 * We do not need to take the kvm->lock here, because nobody else
779 * has a reference to the struct kvm at this point and therefore
780 * cannot access the devices list anyhow.
782 list_for_each_entry_safe(dev
, tmp
, &kvm
->devices
, vm_node
) {
783 list_del(&dev
->vm_node
);
784 dev
->ops
->destroy(dev
);
788 static void kvm_destroy_vm(struct kvm
*kvm
)
791 struct mm_struct
*mm
= kvm
->mm
;
793 kvm_uevent_notify_change(KVM_EVENT_DESTROY_VM
, kvm
);
794 kvm_destroy_vm_debugfs(kvm
);
795 kvm_arch_sync_events(kvm
);
796 mutex_lock(&kvm_lock
);
797 list_del(&kvm
->vm_list
);
798 mutex_unlock(&kvm_lock
);
799 kvm_arch_pre_destroy_vm(kvm
);
801 kvm_free_irq_routing(kvm
);
802 for (i
= 0; i
< KVM_NR_BUSES
; i
++) {
803 struct kvm_io_bus
*bus
= kvm_get_bus(kvm
, i
);
806 kvm_io_bus_destroy(bus
);
807 kvm
->buses
[i
] = NULL
;
809 kvm_coalesced_mmio_free(kvm
);
810 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
811 mmu_notifier_unregister(&kvm
->mmu_notifier
, kvm
->mm
);
813 kvm_arch_flush_shadow_all(kvm
);
815 kvm_arch_destroy_vm(kvm
);
816 kvm_destroy_devices(kvm
);
817 for (i
= 0; i
< KVM_ADDRESS_SPACE_NUM
; i
++)
818 kvm_free_memslots(kvm
, __kvm_memslots(kvm
, i
));
819 cleanup_srcu_struct(&kvm
->irq_srcu
);
820 cleanup_srcu_struct(&kvm
->srcu
);
821 kvm_arch_free_vm(kvm
);
822 preempt_notifier_dec();
823 hardware_disable_all();
827 void kvm_get_kvm(struct kvm
*kvm
)
829 refcount_inc(&kvm
->users_count
);
831 EXPORT_SYMBOL_GPL(kvm_get_kvm
);
833 void kvm_put_kvm(struct kvm
*kvm
)
835 if (refcount_dec_and_test(&kvm
->users_count
))
838 EXPORT_SYMBOL_GPL(kvm_put_kvm
);
841 * Used to put a reference that was taken on behalf of an object associated
842 * with a user-visible file descriptor, e.g. a vcpu or device, if installation
843 * of the new file descriptor fails and the reference cannot be transferred to
844 * its final owner. In such cases, the caller is still actively using @kvm and
845 * will fail miserably if the refcount unexpectedly hits zero.
847 void kvm_put_kvm_no_destroy(struct kvm
*kvm
)
849 WARN_ON(refcount_dec_and_test(&kvm
->users_count
));
851 EXPORT_SYMBOL_GPL(kvm_put_kvm_no_destroy
);
853 static int kvm_vm_release(struct inode
*inode
, struct file
*filp
)
855 struct kvm
*kvm
= filp
->private_data
;
857 kvm_irqfd_release(kvm
);
864 * Allocation size is twice as large as the actual dirty bitmap size.
865 * See kvm_vm_ioctl_get_dirty_log() why this is needed.
867 static int kvm_alloc_dirty_bitmap(struct kvm_memory_slot
*memslot
)
869 unsigned long dirty_bytes
= 2 * kvm_dirty_bitmap_bytes(memslot
);
871 memslot
->dirty_bitmap
= kvzalloc(dirty_bytes
, GFP_KERNEL_ACCOUNT
);
872 if (!memslot
->dirty_bitmap
)
879 * Delete a memslot by decrementing the number of used slots and shifting all
880 * other entries in the array forward one spot.
882 static inline void kvm_memslot_delete(struct kvm_memslots
*slots
,
883 struct kvm_memory_slot
*memslot
)
885 struct kvm_memory_slot
*mslots
= slots
->memslots
;
888 if (WARN_ON(slots
->id_to_index
[memslot
->id
] == -1))
893 if (atomic_read(&slots
->lru_slot
) >= slots
->used_slots
)
894 atomic_set(&slots
->lru_slot
, 0);
896 for (i
= slots
->id_to_index
[memslot
->id
]; i
< slots
->used_slots
; i
++) {
897 mslots
[i
] = mslots
[i
+ 1];
898 slots
->id_to_index
[mslots
[i
].id
] = i
;
900 mslots
[i
] = *memslot
;
901 slots
->id_to_index
[memslot
->id
] = -1;
905 * "Insert" a new memslot by incrementing the number of used slots. Returns
906 * the new slot's initial index into the memslots array.
908 static inline int kvm_memslot_insert_back(struct kvm_memslots
*slots
)
910 return slots
->used_slots
++;
914 * Move a changed memslot backwards in the array by shifting existing slots
915 * with a higher GFN toward the front of the array. Note, the changed memslot
916 * itself is not preserved in the array, i.e. not swapped at this time, only
917 * its new index into the array is tracked. Returns the changed memslot's
918 * current index into the memslots array.
920 static inline int kvm_memslot_move_backward(struct kvm_memslots
*slots
,
921 struct kvm_memory_slot
*memslot
)
923 struct kvm_memory_slot
*mslots
= slots
->memslots
;
926 if (WARN_ON_ONCE(slots
->id_to_index
[memslot
->id
] == -1) ||
927 WARN_ON_ONCE(!slots
->used_slots
))
931 * Move the target memslot backward in the array by shifting existing
932 * memslots with a higher GFN (than the target memslot) towards the
933 * front of the array.
935 for (i
= slots
->id_to_index
[memslot
->id
]; i
< slots
->used_slots
- 1; i
++) {
936 if (memslot
->base_gfn
> mslots
[i
+ 1].base_gfn
)
939 WARN_ON_ONCE(memslot
->base_gfn
== mslots
[i
+ 1].base_gfn
);
941 /* Shift the next memslot forward one and update its index. */
942 mslots
[i
] = mslots
[i
+ 1];
943 slots
->id_to_index
[mslots
[i
].id
] = i
;
949 * Move a changed memslot forwards in the array by shifting existing slots with
950 * a lower GFN toward the back of the array. Note, the changed memslot itself
951 * is not preserved in the array, i.e. not swapped at this time, only its new
952 * index into the array is tracked. Returns the changed memslot's final index
953 * into the memslots array.
955 static inline int kvm_memslot_move_forward(struct kvm_memslots
*slots
,
956 struct kvm_memory_slot
*memslot
,
959 struct kvm_memory_slot
*mslots
= slots
->memslots
;
962 for (i
= start
; i
> 0; i
--) {
963 if (memslot
->base_gfn
< mslots
[i
- 1].base_gfn
)
966 WARN_ON_ONCE(memslot
->base_gfn
== mslots
[i
- 1].base_gfn
);
968 /* Shift the next memslot back one and update its index. */
969 mslots
[i
] = mslots
[i
- 1];
970 slots
->id_to_index
[mslots
[i
].id
] = i
;
976 * Re-sort memslots based on their GFN to account for an added, deleted, or
977 * moved memslot. Sorting memslots by GFN allows using a binary search during
980 * IMPORTANT: Slots are sorted from highest GFN to lowest GFN! I.e. the entry
981 * at memslots[0] has the highest GFN.
983 * The sorting algorithm takes advantage of having initially sorted memslots
984 * and knowing the position of the changed memslot. Sorting is also optimized
985 * by not swapping the updated memslot and instead only shifting other memslots
986 * and tracking the new index for the update memslot. Only once its final
987 * index is known is the updated memslot copied into its position in the array.
989 * - When deleting a memslot, the deleted memslot simply needs to be moved to
990 * the end of the array.
992 * - When creating a memslot, the algorithm "inserts" the new memslot at the
993 * end of the array and then it forward to its correct location.
995 * - When moving a memslot, the algorithm first moves the updated memslot
996 * backward to handle the scenario where the memslot's GFN was changed to a
997 * lower value. update_memslots() then falls through and runs the same flow
998 * as creating a memslot to move the memslot forward to handle the scenario
999 * where its GFN was changed to a higher value.
1001 * Note, slots are sorted from highest->lowest instead of lowest->highest for
1002 * historical reasons. Originally, invalid memslots where denoted by having
1003 * GFN=0, thus sorting from highest->lowest naturally sorted invalid memslots
1004 * to the end of the array. The current algorithm uses dedicated logic to
1005 * delete a memslot and thus does not rely on invalid memslots having GFN=0.
1007 * The other historical motiviation for highest->lowest was to improve the
1008 * performance of memslot lookup. KVM originally used a linear search starting
1009 * at memslots[0]. On x86, the largest memslot usually has one of the highest,
1010 * if not *the* highest, GFN, as the bulk of the guest's RAM is located in a
1011 * single memslot above the 4gb boundary. As the largest memslot is also the
1012 * most likely to be referenced, sorting it to the front of the array was
1013 * advantageous. The current binary search starts from the middle of the array
1014 * and uses an LRU pointer to improve performance for all memslots and GFNs.
1016 static void update_memslots(struct kvm_memslots
*slots
,
1017 struct kvm_memory_slot
*memslot
,
1018 enum kvm_mr_change change
)
1022 if (change
== KVM_MR_DELETE
) {
1023 kvm_memslot_delete(slots
, memslot
);
1025 if (change
== KVM_MR_CREATE
)
1026 i
= kvm_memslot_insert_back(slots
);
1028 i
= kvm_memslot_move_backward(slots
, memslot
);
1029 i
= kvm_memslot_move_forward(slots
, memslot
, i
);
1032 * Copy the memslot to its new position in memslots and update
1033 * its index accordingly.
1035 slots
->memslots
[i
] = *memslot
;
1036 slots
->id_to_index
[memslot
->id
] = i
;
1040 static int check_memory_region_flags(const struct kvm_userspace_memory_region
*mem
)
1042 u32 valid_flags
= KVM_MEM_LOG_DIRTY_PAGES
;
1044 #ifdef __KVM_HAVE_READONLY_MEM
1045 valid_flags
|= KVM_MEM_READONLY
;
1048 if (mem
->flags
& ~valid_flags
)
1054 static struct kvm_memslots
*install_new_memslots(struct kvm
*kvm
,
1055 int as_id
, struct kvm_memslots
*slots
)
1057 struct kvm_memslots
*old_memslots
= __kvm_memslots(kvm
, as_id
);
1058 u64 gen
= old_memslots
->generation
;
1060 WARN_ON(gen
& KVM_MEMSLOT_GEN_UPDATE_IN_PROGRESS
);
1061 slots
->generation
= gen
| KVM_MEMSLOT_GEN_UPDATE_IN_PROGRESS
;
1063 rcu_assign_pointer(kvm
->memslots
[as_id
], slots
);
1064 synchronize_srcu_expedited(&kvm
->srcu
);
1067 * Increment the new memslot generation a second time, dropping the
1068 * update in-progress flag and incrementing the generation based on
1069 * the number of address spaces. This provides a unique and easily
1070 * identifiable generation number while the memslots are in flux.
1072 gen
= slots
->generation
& ~KVM_MEMSLOT_GEN_UPDATE_IN_PROGRESS
;
1075 * Generations must be unique even across address spaces. We do not need
1076 * a global counter for that, instead the generation space is evenly split
1077 * across address spaces. For example, with two address spaces, address
1078 * space 0 will use generations 0, 2, 4, ... while address space 1 will
1079 * use generations 1, 3, 5, ...
1081 gen
+= KVM_ADDRESS_SPACE_NUM
;
1083 kvm_arch_memslots_updated(kvm
, gen
);
1085 slots
->generation
= gen
;
1087 return old_memslots
;
1091 * Note, at a minimum, the current number of used slots must be allocated, even
1092 * when deleting a memslot, as we need a complete duplicate of the memslots for
1093 * use when invalidating a memslot prior to deleting/moving the memslot.
1095 static struct kvm_memslots
*kvm_dup_memslots(struct kvm_memslots
*old
,
1096 enum kvm_mr_change change
)
1098 struct kvm_memslots
*slots
;
1099 size_t old_size
, new_size
;
1101 old_size
= sizeof(struct kvm_memslots
) +
1102 (sizeof(struct kvm_memory_slot
) * old
->used_slots
);
1104 if (change
== KVM_MR_CREATE
)
1105 new_size
= old_size
+ sizeof(struct kvm_memory_slot
);
1107 new_size
= old_size
;
1109 slots
= kvzalloc(new_size
, GFP_KERNEL_ACCOUNT
);
1111 memcpy(slots
, old
, old_size
);
1116 static int kvm_set_memslot(struct kvm
*kvm
,
1117 const struct kvm_userspace_memory_region
*mem
,
1118 struct kvm_memory_slot
*old
,
1119 struct kvm_memory_slot
*new, int as_id
,
1120 enum kvm_mr_change change
)
1122 struct kvm_memory_slot
*slot
;
1123 struct kvm_memslots
*slots
;
1126 slots
= kvm_dup_memslots(__kvm_memslots(kvm
, as_id
), change
);
1130 if (change
== KVM_MR_DELETE
|| change
== KVM_MR_MOVE
) {
1132 * Note, the INVALID flag needs to be in the appropriate entry
1133 * in the freshly allocated memslots, not in @old or @new.
1135 slot
= id_to_memslot(slots
, old
->id
);
1136 slot
->flags
|= KVM_MEMSLOT_INVALID
;
1139 * We can re-use the old memslots, the only difference from the
1140 * newly installed memslots is the invalid flag, which will get
1141 * dropped by update_memslots anyway. We'll also revert to the
1142 * old memslots if preparing the new memory region fails.
1144 slots
= install_new_memslots(kvm
, as_id
, slots
);
1146 /* From this point no new shadow pages pointing to a deleted,
1147 * or moved, memslot will be created.
1149 * validation of sp->gfn happens in:
1150 * - gfn_to_hva (kvm_read_guest, gfn_to_pfn)
1151 * - kvm_is_visible_gfn (mmu_check_root)
1153 kvm_arch_flush_shadow_memslot(kvm
, slot
);
1156 r
= kvm_arch_prepare_memory_region(kvm
, new, mem
, change
);
1160 update_memslots(slots
, new, change
);
1161 slots
= install_new_memslots(kvm
, as_id
, slots
);
1163 kvm_arch_commit_memory_region(kvm
, mem
, old
, new, change
);
1169 if (change
== KVM_MR_DELETE
|| change
== KVM_MR_MOVE
)
1170 slots
= install_new_memslots(kvm
, as_id
, slots
);
1175 static int kvm_delete_memslot(struct kvm
*kvm
,
1176 const struct kvm_userspace_memory_region
*mem
,
1177 struct kvm_memory_slot
*old
, int as_id
)
1179 struct kvm_memory_slot
new;
1185 memset(&new, 0, sizeof(new));
1188 r
= kvm_set_memslot(kvm
, mem
, old
, &new, as_id
, KVM_MR_DELETE
);
1192 kvm_free_memslot(kvm
, old
);
1197 * Allocate some memory and give it an address in the guest physical address
1200 * Discontiguous memory is allowed, mostly for framebuffers.
1202 * Must be called holding kvm->slots_lock for write.
1204 int __kvm_set_memory_region(struct kvm
*kvm
,
1205 const struct kvm_userspace_memory_region
*mem
)
1207 struct kvm_memory_slot old
, new;
1208 struct kvm_memory_slot
*tmp
;
1209 enum kvm_mr_change change
;
1213 r
= check_memory_region_flags(mem
);
1217 as_id
= mem
->slot
>> 16;
1218 id
= (u16
)mem
->slot
;
1220 /* General sanity checks */
1221 if (mem
->memory_size
& (PAGE_SIZE
- 1))
1223 if (mem
->guest_phys_addr
& (PAGE_SIZE
- 1))
1225 /* We can read the guest memory with __xxx_user() later on. */
1226 if ((id
< KVM_USER_MEM_SLOTS
) &&
1227 ((mem
->userspace_addr
& (PAGE_SIZE
- 1)) ||
1228 !access_ok((void __user
*)(unsigned long)mem
->userspace_addr
,
1231 if (as_id
>= KVM_ADDRESS_SPACE_NUM
|| id
>= KVM_MEM_SLOTS_NUM
)
1233 if (mem
->guest_phys_addr
+ mem
->memory_size
< mem
->guest_phys_addr
)
1237 * Make a full copy of the old memslot, the pointer will become stale
1238 * when the memslots are re-sorted by update_memslots(), and the old
1239 * memslot needs to be referenced after calling update_memslots(), e.g.
1240 * to free its resources and for arch specific behavior.
1242 tmp
= id_to_memslot(__kvm_memslots(kvm
, as_id
), id
);
1247 memset(&old
, 0, sizeof(old
));
1251 if (!mem
->memory_size
)
1252 return kvm_delete_memslot(kvm
, mem
, &old
, as_id
);
1255 new.base_gfn
= mem
->guest_phys_addr
>> PAGE_SHIFT
;
1256 new.npages
= mem
->memory_size
>> PAGE_SHIFT
;
1257 new.flags
= mem
->flags
;
1258 new.userspace_addr
= mem
->userspace_addr
;
1260 if (new.npages
> KVM_MEM_MAX_NR_PAGES
)
1264 change
= KVM_MR_CREATE
;
1265 new.dirty_bitmap
= NULL
;
1266 memset(&new.arch
, 0, sizeof(new.arch
));
1267 } else { /* Modify an existing slot. */
1268 if ((new.userspace_addr
!= old
.userspace_addr
) ||
1269 (new.npages
!= old
.npages
) ||
1270 ((new.flags
^ old
.flags
) & KVM_MEM_READONLY
))
1273 if (new.base_gfn
!= old
.base_gfn
)
1274 change
= KVM_MR_MOVE
;
1275 else if (new.flags
!= old
.flags
)
1276 change
= KVM_MR_FLAGS_ONLY
;
1277 else /* Nothing to change. */
1280 /* Copy dirty_bitmap and arch from the current memslot. */
1281 new.dirty_bitmap
= old
.dirty_bitmap
;
1282 memcpy(&new.arch
, &old
.arch
, sizeof(new.arch
));
1285 if ((change
== KVM_MR_CREATE
) || (change
== KVM_MR_MOVE
)) {
1286 /* Check for overlaps */
1287 kvm_for_each_memslot(tmp
, __kvm_memslots(kvm
, as_id
)) {
1290 if (!((new.base_gfn
+ new.npages
<= tmp
->base_gfn
) ||
1291 (new.base_gfn
>= tmp
->base_gfn
+ tmp
->npages
)))
1296 /* Allocate/free page dirty bitmap as needed */
1297 if (!(new.flags
& KVM_MEM_LOG_DIRTY_PAGES
))
1298 new.dirty_bitmap
= NULL
;
1299 else if (!new.dirty_bitmap
) {
1300 r
= kvm_alloc_dirty_bitmap(&new);
1304 if (kvm_dirty_log_manual_protect_and_init_set(kvm
))
1305 bitmap_set(new.dirty_bitmap
, 0, new.npages
);
1308 r
= kvm_set_memslot(kvm
, mem
, &old
, &new, as_id
, change
);
1312 if (old
.dirty_bitmap
&& !new.dirty_bitmap
)
1313 kvm_destroy_dirty_bitmap(&old
);
1317 if (new.dirty_bitmap
&& !old
.dirty_bitmap
)
1318 kvm_destroy_dirty_bitmap(&new);
1321 EXPORT_SYMBOL_GPL(__kvm_set_memory_region
);
1323 int kvm_set_memory_region(struct kvm
*kvm
,
1324 const struct kvm_userspace_memory_region
*mem
)
1328 mutex_lock(&kvm
->slots_lock
);
1329 r
= __kvm_set_memory_region(kvm
, mem
);
1330 mutex_unlock(&kvm
->slots_lock
);
1333 EXPORT_SYMBOL_GPL(kvm_set_memory_region
);
1335 static int kvm_vm_ioctl_set_memory_region(struct kvm
*kvm
,
1336 struct kvm_userspace_memory_region
*mem
)
1338 if ((u16
)mem
->slot
>= KVM_USER_MEM_SLOTS
)
1341 return kvm_set_memory_region(kvm
, mem
);
1344 #ifndef CONFIG_KVM_GENERIC_DIRTYLOG_READ_PROTECT
1346 * kvm_get_dirty_log - get a snapshot of dirty pages
1347 * @kvm: pointer to kvm instance
1348 * @log: slot id and address to which we copy the log
1349 * @is_dirty: set to '1' if any dirty pages were found
1350 * @memslot: set to the associated memslot, always valid on success
1352 int kvm_get_dirty_log(struct kvm
*kvm
, struct kvm_dirty_log
*log
,
1353 int *is_dirty
, struct kvm_memory_slot
**memslot
)
1355 struct kvm_memslots
*slots
;
1358 unsigned long any
= 0;
1363 as_id
= log
->slot
>> 16;
1364 id
= (u16
)log
->slot
;
1365 if (as_id
>= KVM_ADDRESS_SPACE_NUM
|| id
>= KVM_USER_MEM_SLOTS
)
1368 slots
= __kvm_memslots(kvm
, as_id
);
1369 *memslot
= id_to_memslot(slots
, id
);
1370 if (!(*memslot
) || !(*memslot
)->dirty_bitmap
)
1373 kvm_arch_sync_dirty_log(kvm
, *memslot
);
1375 n
= kvm_dirty_bitmap_bytes(*memslot
);
1377 for (i
= 0; !any
&& i
< n
/sizeof(long); ++i
)
1378 any
= (*memslot
)->dirty_bitmap
[i
];
1380 if (copy_to_user(log
->dirty_bitmap
, (*memslot
)->dirty_bitmap
, n
))
1387 EXPORT_SYMBOL_GPL(kvm_get_dirty_log
);
1389 #else /* CONFIG_KVM_GENERIC_DIRTYLOG_READ_PROTECT */
1391 * kvm_get_dirty_log_protect - get a snapshot of dirty pages
1392 * and reenable dirty page tracking for the corresponding pages.
1393 * @kvm: pointer to kvm instance
1394 * @log: slot id and address to which we copy the log
1396 * We need to keep it in mind that VCPU threads can write to the bitmap
1397 * concurrently. So, to avoid losing track of dirty pages we keep the
1400 * 1. Take a snapshot of the bit and clear it if needed.
1401 * 2. Write protect the corresponding page.
1402 * 3. Copy the snapshot to the userspace.
1403 * 4. Upon return caller flushes TLB's if needed.
1405 * Between 2 and 4, the guest may write to the page using the remaining TLB
1406 * entry. This is not a problem because the page is reported dirty using
1407 * the snapshot taken before and step 4 ensures that writes done after
1408 * exiting to userspace will be logged for the next call.
1411 static int kvm_get_dirty_log_protect(struct kvm
*kvm
, struct kvm_dirty_log
*log
)
1413 struct kvm_memslots
*slots
;
1414 struct kvm_memory_slot
*memslot
;
1417 unsigned long *dirty_bitmap
;
1418 unsigned long *dirty_bitmap_buffer
;
1421 as_id
= log
->slot
>> 16;
1422 id
= (u16
)log
->slot
;
1423 if (as_id
>= KVM_ADDRESS_SPACE_NUM
|| id
>= KVM_USER_MEM_SLOTS
)
1426 slots
= __kvm_memslots(kvm
, as_id
);
1427 memslot
= id_to_memslot(slots
, id
);
1428 if (!memslot
|| !memslot
->dirty_bitmap
)
1431 dirty_bitmap
= memslot
->dirty_bitmap
;
1433 kvm_arch_sync_dirty_log(kvm
, memslot
);
1435 n
= kvm_dirty_bitmap_bytes(memslot
);
1437 if (kvm
->manual_dirty_log_protect
) {
1439 * Unlike kvm_get_dirty_log, we always return false in *flush,
1440 * because no flush is needed until KVM_CLEAR_DIRTY_LOG. There
1441 * is some code duplication between this function and
1442 * kvm_get_dirty_log, but hopefully all architecture
1443 * transition to kvm_get_dirty_log_protect and kvm_get_dirty_log
1444 * can be eliminated.
1446 dirty_bitmap_buffer
= dirty_bitmap
;
1448 dirty_bitmap_buffer
= kvm_second_dirty_bitmap(memslot
);
1449 memset(dirty_bitmap_buffer
, 0, n
);
1451 spin_lock(&kvm
->mmu_lock
);
1452 for (i
= 0; i
< n
/ sizeof(long); i
++) {
1456 if (!dirty_bitmap
[i
])
1460 mask
= xchg(&dirty_bitmap
[i
], 0);
1461 dirty_bitmap_buffer
[i
] = mask
;
1463 offset
= i
* BITS_PER_LONG
;
1464 kvm_arch_mmu_enable_log_dirty_pt_masked(kvm
, memslot
,
1467 spin_unlock(&kvm
->mmu_lock
);
1471 kvm_arch_flush_remote_tlbs_memslot(kvm
, memslot
);
1473 if (copy_to_user(log
->dirty_bitmap
, dirty_bitmap_buffer
, n
))
1480 * kvm_vm_ioctl_get_dirty_log - get and clear the log of dirty pages in a slot
1481 * @kvm: kvm instance
1482 * @log: slot id and address to which we copy the log
1484 * Steps 1-4 below provide general overview of dirty page logging. See
1485 * kvm_get_dirty_log_protect() function description for additional details.
1487 * We call kvm_get_dirty_log_protect() to handle steps 1-3, upon return we
1488 * always flush the TLB (step 4) even if previous step failed and the dirty
1489 * bitmap may be corrupt. Regardless of previous outcome the KVM logging API
1490 * does not preclude user space subsequent dirty log read. Flushing TLB ensures
1491 * writes will be marked dirty for next log read.
1493 * 1. Take a snapshot of the bit and clear it if needed.
1494 * 2. Write protect the corresponding page.
1495 * 3. Copy the snapshot to the userspace.
1496 * 4. Flush TLB's if needed.
1498 static int kvm_vm_ioctl_get_dirty_log(struct kvm
*kvm
,
1499 struct kvm_dirty_log
*log
)
1503 mutex_lock(&kvm
->slots_lock
);
1505 r
= kvm_get_dirty_log_protect(kvm
, log
);
1507 mutex_unlock(&kvm
->slots_lock
);
1512 * kvm_clear_dirty_log_protect - clear dirty bits in the bitmap
1513 * and reenable dirty page tracking for the corresponding pages.
1514 * @kvm: pointer to kvm instance
1515 * @log: slot id and address from which to fetch the bitmap of dirty pages
1517 static int kvm_clear_dirty_log_protect(struct kvm
*kvm
,
1518 struct kvm_clear_dirty_log
*log
)
1520 struct kvm_memslots
*slots
;
1521 struct kvm_memory_slot
*memslot
;
1525 unsigned long *dirty_bitmap
;
1526 unsigned long *dirty_bitmap_buffer
;
1529 as_id
= log
->slot
>> 16;
1530 id
= (u16
)log
->slot
;
1531 if (as_id
>= KVM_ADDRESS_SPACE_NUM
|| id
>= KVM_USER_MEM_SLOTS
)
1534 if (log
->first_page
& 63)
1537 slots
= __kvm_memslots(kvm
, as_id
);
1538 memslot
= id_to_memslot(slots
, id
);
1539 if (!memslot
|| !memslot
->dirty_bitmap
)
1542 dirty_bitmap
= memslot
->dirty_bitmap
;
1544 n
= ALIGN(log
->num_pages
, BITS_PER_LONG
) / 8;
1546 if (log
->first_page
> memslot
->npages
||
1547 log
->num_pages
> memslot
->npages
- log
->first_page
||
1548 (log
->num_pages
< memslot
->npages
- log
->first_page
&& (log
->num_pages
& 63)))
1551 kvm_arch_sync_dirty_log(kvm
, memslot
);
1554 dirty_bitmap_buffer
= kvm_second_dirty_bitmap(memslot
);
1555 if (copy_from_user(dirty_bitmap_buffer
, log
->dirty_bitmap
, n
))
1558 spin_lock(&kvm
->mmu_lock
);
1559 for (offset
= log
->first_page
, i
= offset
/ BITS_PER_LONG
,
1560 n
= DIV_ROUND_UP(log
->num_pages
, BITS_PER_LONG
); n
--;
1561 i
++, offset
+= BITS_PER_LONG
) {
1562 unsigned long mask
= *dirty_bitmap_buffer
++;
1563 atomic_long_t
*p
= (atomic_long_t
*) &dirty_bitmap
[i
];
1567 mask
&= atomic_long_fetch_andnot(mask
, p
);
1570 * mask contains the bits that really have been cleared. This
1571 * never includes any bits beyond the length of the memslot (if
1572 * the length is not aligned to 64 pages), therefore it is not
1573 * a problem if userspace sets them in log->dirty_bitmap.
1577 kvm_arch_mmu_enable_log_dirty_pt_masked(kvm
, memslot
,
1581 spin_unlock(&kvm
->mmu_lock
);
1584 kvm_arch_flush_remote_tlbs_memslot(kvm
, memslot
);
1589 static int kvm_vm_ioctl_clear_dirty_log(struct kvm
*kvm
,
1590 struct kvm_clear_dirty_log
*log
)
1594 mutex_lock(&kvm
->slots_lock
);
1596 r
= kvm_clear_dirty_log_protect(kvm
, log
);
1598 mutex_unlock(&kvm
->slots_lock
);
1601 #endif /* CONFIG_KVM_GENERIC_DIRTYLOG_READ_PROTECT */
1603 struct kvm_memory_slot
*gfn_to_memslot(struct kvm
*kvm
, gfn_t gfn
)
1605 return __gfn_to_memslot(kvm_memslots(kvm
), gfn
);
1607 EXPORT_SYMBOL_GPL(gfn_to_memslot
);
1609 struct kvm_memory_slot
*kvm_vcpu_gfn_to_memslot(struct kvm_vcpu
*vcpu
, gfn_t gfn
)
1611 return __gfn_to_memslot(kvm_vcpu_memslots(vcpu
), gfn
);
1614 bool kvm_is_visible_gfn(struct kvm
*kvm
, gfn_t gfn
)
1616 struct kvm_memory_slot
*memslot
= gfn_to_memslot(kvm
, gfn
);
1618 if (!memslot
|| memslot
->id
>= KVM_USER_MEM_SLOTS
||
1619 memslot
->flags
& KVM_MEMSLOT_INVALID
)
1624 EXPORT_SYMBOL_GPL(kvm_is_visible_gfn
);
1626 unsigned long kvm_host_page_size(struct kvm_vcpu
*vcpu
, gfn_t gfn
)
1628 struct vm_area_struct
*vma
;
1629 unsigned long addr
, size
;
1633 addr
= kvm_vcpu_gfn_to_hva_prot(vcpu
, gfn
, NULL
);
1634 if (kvm_is_error_hva(addr
))
1637 down_read(¤t
->mm
->mmap_sem
);
1638 vma
= find_vma(current
->mm
, addr
);
1642 size
= vma_kernel_pagesize(vma
);
1645 up_read(¤t
->mm
->mmap_sem
);
1650 static bool memslot_is_readonly(struct kvm_memory_slot
*slot
)
1652 return slot
->flags
& KVM_MEM_READONLY
;
1655 static unsigned long __gfn_to_hva_many(struct kvm_memory_slot
*slot
, gfn_t gfn
,
1656 gfn_t
*nr_pages
, bool write
)
1658 if (!slot
|| slot
->flags
& KVM_MEMSLOT_INVALID
)
1659 return KVM_HVA_ERR_BAD
;
1661 if (memslot_is_readonly(slot
) && write
)
1662 return KVM_HVA_ERR_RO_BAD
;
1665 *nr_pages
= slot
->npages
- (gfn
- slot
->base_gfn
);
1667 return __gfn_to_hva_memslot(slot
, gfn
);
1670 static unsigned long gfn_to_hva_many(struct kvm_memory_slot
*slot
, gfn_t gfn
,
1673 return __gfn_to_hva_many(slot
, gfn
, nr_pages
, true);
1676 unsigned long gfn_to_hva_memslot(struct kvm_memory_slot
*slot
,
1679 return gfn_to_hva_many(slot
, gfn
, NULL
);
1681 EXPORT_SYMBOL_GPL(gfn_to_hva_memslot
);
1683 unsigned long gfn_to_hva(struct kvm
*kvm
, gfn_t gfn
)
1685 return gfn_to_hva_many(gfn_to_memslot(kvm
, gfn
), gfn
, NULL
);
1687 EXPORT_SYMBOL_GPL(gfn_to_hva
);
1689 unsigned long kvm_vcpu_gfn_to_hva(struct kvm_vcpu
*vcpu
, gfn_t gfn
)
1691 return gfn_to_hva_many(kvm_vcpu_gfn_to_memslot(vcpu
, gfn
), gfn
, NULL
);
1693 EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_hva
);
1696 * Return the hva of a @gfn and the R/W attribute if possible.
1698 * @slot: the kvm_memory_slot which contains @gfn
1699 * @gfn: the gfn to be translated
1700 * @writable: used to return the read/write attribute of the @slot if the hva
1701 * is valid and @writable is not NULL
1703 unsigned long gfn_to_hva_memslot_prot(struct kvm_memory_slot
*slot
,
1704 gfn_t gfn
, bool *writable
)
1706 unsigned long hva
= __gfn_to_hva_many(slot
, gfn
, NULL
, false);
1708 if (!kvm_is_error_hva(hva
) && writable
)
1709 *writable
= !memslot_is_readonly(slot
);
1714 unsigned long gfn_to_hva_prot(struct kvm
*kvm
, gfn_t gfn
, bool *writable
)
1716 struct kvm_memory_slot
*slot
= gfn_to_memslot(kvm
, gfn
);
1718 return gfn_to_hva_memslot_prot(slot
, gfn
, writable
);
1721 unsigned long kvm_vcpu_gfn_to_hva_prot(struct kvm_vcpu
*vcpu
, gfn_t gfn
, bool *writable
)
1723 struct kvm_memory_slot
*slot
= kvm_vcpu_gfn_to_memslot(vcpu
, gfn
);
1725 return gfn_to_hva_memslot_prot(slot
, gfn
, writable
);
1728 static inline int check_user_page_hwpoison(unsigned long addr
)
1730 int rc
, flags
= FOLL_HWPOISON
| FOLL_WRITE
;
1732 rc
= get_user_pages(addr
, 1, flags
, NULL
, NULL
);
1733 return rc
== -EHWPOISON
;
1737 * The fast path to get the writable pfn which will be stored in @pfn,
1738 * true indicates success, otherwise false is returned. It's also the
1739 * only part that runs if we can in atomic context.
1741 static bool hva_to_pfn_fast(unsigned long addr
, bool write_fault
,
1742 bool *writable
, kvm_pfn_t
*pfn
)
1744 struct page
*page
[1];
1748 * Fast pin a writable pfn only if it is a write fault request
1749 * or the caller allows to map a writable pfn for a read fault
1752 if (!(write_fault
|| writable
))
1755 npages
= __get_user_pages_fast(addr
, 1, 1, page
);
1757 *pfn
= page_to_pfn(page
[0]);
1768 * The slow path to get the pfn of the specified host virtual address,
1769 * 1 indicates success, -errno is returned if error is detected.
1771 static int hva_to_pfn_slow(unsigned long addr
, bool *async
, bool write_fault
,
1772 bool *writable
, kvm_pfn_t
*pfn
)
1774 unsigned int flags
= FOLL_HWPOISON
;
1781 *writable
= write_fault
;
1784 flags
|= FOLL_WRITE
;
1786 flags
|= FOLL_NOWAIT
;
1788 npages
= get_user_pages_unlocked(addr
, 1, &page
, flags
);
1792 /* map read fault as writable if possible */
1793 if (unlikely(!write_fault
) && writable
) {
1796 if (__get_user_pages_fast(addr
, 1, 1, &wpage
) == 1) {
1802 *pfn
= page_to_pfn(page
);
1806 static bool vma_is_valid(struct vm_area_struct
*vma
, bool write_fault
)
1808 if (unlikely(!(vma
->vm_flags
& VM_READ
)))
1811 if (write_fault
&& (unlikely(!(vma
->vm_flags
& VM_WRITE
))))
1817 static int hva_to_pfn_remapped(struct vm_area_struct
*vma
,
1818 unsigned long addr
, bool *async
,
1819 bool write_fault
, bool *writable
,
1825 r
= follow_pfn(vma
, addr
, &pfn
);
1828 * get_user_pages fails for VM_IO and VM_PFNMAP vmas and does
1829 * not call the fault handler, so do it here.
1831 bool unlocked
= false;
1832 r
= fixup_user_fault(current
, current
->mm
, addr
,
1833 (write_fault
? FAULT_FLAG_WRITE
: 0),
1840 r
= follow_pfn(vma
, addr
, &pfn
);
1850 * Get a reference here because callers of *hva_to_pfn* and
1851 * *gfn_to_pfn* ultimately call kvm_release_pfn_clean on the
1852 * returned pfn. This is only needed if the VMA has VM_MIXEDMAP
1853 * set, but the kvm_get_pfn/kvm_release_pfn_clean pair will
1854 * simply do nothing for reserved pfns.
1856 * Whoever called remap_pfn_range is also going to call e.g.
1857 * unmap_mapping_range before the underlying pages are freed,
1858 * causing a call to our MMU notifier.
1867 * Pin guest page in memory and return its pfn.
1868 * @addr: host virtual address which maps memory to the guest
1869 * @atomic: whether this function can sleep
1870 * @async: whether this function need to wait IO complete if the
1871 * host page is not in the memory
1872 * @write_fault: whether we should get a writable host page
1873 * @writable: whether it allows to map a writable host page for !@write_fault
1875 * The function will map a writable host page for these two cases:
1876 * 1): @write_fault = true
1877 * 2): @write_fault = false && @writable, @writable will tell the caller
1878 * whether the mapping is writable.
1880 static kvm_pfn_t
hva_to_pfn(unsigned long addr
, bool atomic
, bool *async
,
1881 bool write_fault
, bool *writable
)
1883 struct vm_area_struct
*vma
;
1887 /* we can do it either atomically or asynchronously, not both */
1888 BUG_ON(atomic
&& async
);
1890 if (hva_to_pfn_fast(addr
, write_fault
, writable
, &pfn
))
1894 return KVM_PFN_ERR_FAULT
;
1896 npages
= hva_to_pfn_slow(addr
, async
, write_fault
, writable
, &pfn
);
1900 down_read(¤t
->mm
->mmap_sem
);
1901 if (npages
== -EHWPOISON
||
1902 (!async
&& check_user_page_hwpoison(addr
))) {
1903 pfn
= KVM_PFN_ERR_HWPOISON
;
1908 vma
= find_vma_intersection(current
->mm
, addr
, addr
+ 1);
1911 pfn
= KVM_PFN_ERR_FAULT
;
1912 else if (vma
->vm_flags
& (VM_IO
| VM_PFNMAP
)) {
1913 r
= hva_to_pfn_remapped(vma
, addr
, async
, write_fault
, writable
, &pfn
);
1917 pfn
= KVM_PFN_ERR_FAULT
;
1919 if (async
&& vma_is_valid(vma
, write_fault
))
1921 pfn
= KVM_PFN_ERR_FAULT
;
1924 up_read(¤t
->mm
->mmap_sem
);
1928 kvm_pfn_t
__gfn_to_pfn_memslot(struct kvm_memory_slot
*slot
, gfn_t gfn
,
1929 bool atomic
, bool *async
, bool write_fault
,
1932 unsigned long addr
= __gfn_to_hva_many(slot
, gfn
, NULL
, write_fault
);
1934 if (addr
== KVM_HVA_ERR_RO_BAD
) {
1937 return KVM_PFN_ERR_RO_FAULT
;
1940 if (kvm_is_error_hva(addr
)) {
1943 return KVM_PFN_NOSLOT
;
1946 /* Do not map writable pfn in the readonly memslot. */
1947 if (writable
&& memslot_is_readonly(slot
)) {
1952 return hva_to_pfn(addr
, atomic
, async
, write_fault
,
1955 EXPORT_SYMBOL_GPL(__gfn_to_pfn_memslot
);
1957 kvm_pfn_t
gfn_to_pfn_prot(struct kvm
*kvm
, gfn_t gfn
, bool write_fault
,
1960 return __gfn_to_pfn_memslot(gfn_to_memslot(kvm
, gfn
), gfn
, false, NULL
,
1961 write_fault
, writable
);
1963 EXPORT_SYMBOL_GPL(gfn_to_pfn_prot
);
1965 kvm_pfn_t
gfn_to_pfn_memslot(struct kvm_memory_slot
*slot
, gfn_t gfn
)
1967 return __gfn_to_pfn_memslot(slot
, gfn
, false, NULL
, true, NULL
);
1969 EXPORT_SYMBOL_GPL(gfn_to_pfn_memslot
);
1971 kvm_pfn_t
gfn_to_pfn_memslot_atomic(struct kvm_memory_slot
*slot
, gfn_t gfn
)
1973 return __gfn_to_pfn_memslot(slot
, gfn
, true, NULL
, true, NULL
);
1975 EXPORT_SYMBOL_GPL(gfn_to_pfn_memslot_atomic
);
1977 kvm_pfn_t
kvm_vcpu_gfn_to_pfn_atomic(struct kvm_vcpu
*vcpu
, gfn_t gfn
)
1979 return gfn_to_pfn_memslot_atomic(kvm_vcpu_gfn_to_memslot(vcpu
, gfn
), gfn
);
1981 EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_pfn_atomic
);
1983 kvm_pfn_t
gfn_to_pfn(struct kvm
*kvm
, gfn_t gfn
)
1985 return gfn_to_pfn_memslot(gfn_to_memslot(kvm
, gfn
), gfn
);
1987 EXPORT_SYMBOL_GPL(gfn_to_pfn
);
1989 kvm_pfn_t
kvm_vcpu_gfn_to_pfn(struct kvm_vcpu
*vcpu
, gfn_t gfn
)
1991 return gfn_to_pfn_memslot(kvm_vcpu_gfn_to_memslot(vcpu
, gfn
), gfn
);
1993 EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_pfn
);
1995 int gfn_to_page_many_atomic(struct kvm_memory_slot
*slot
, gfn_t gfn
,
1996 struct page
**pages
, int nr_pages
)
2001 addr
= gfn_to_hva_many(slot
, gfn
, &entry
);
2002 if (kvm_is_error_hva(addr
))
2005 if (entry
< nr_pages
)
2008 return __get_user_pages_fast(addr
, nr_pages
, 1, pages
);
2010 EXPORT_SYMBOL_GPL(gfn_to_page_many_atomic
);
2012 static struct page
*kvm_pfn_to_page(kvm_pfn_t pfn
)
2014 if (is_error_noslot_pfn(pfn
))
2015 return KVM_ERR_PTR_BAD_PAGE
;
2017 if (kvm_is_reserved_pfn(pfn
)) {
2019 return KVM_ERR_PTR_BAD_PAGE
;
2022 return pfn_to_page(pfn
);
2025 struct page
*gfn_to_page(struct kvm
*kvm
, gfn_t gfn
)
2029 pfn
= gfn_to_pfn(kvm
, gfn
);
2031 return kvm_pfn_to_page(pfn
);
2033 EXPORT_SYMBOL_GPL(gfn_to_page
);
2035 void kvm_release_pfn(kvm_pfn_t pfn
, bool dirty
, struct gfn_to_pfn_cache
*cache
)
2041 cache
->pfn
= cache
->gfn
= 0;
2044 kvm_release_pfn_dirty(pfn
);
2046 kvm_release_pfn_clean(pfn
);
2049 static void kvm_cache_gfn_to_pfn(struct kvm_memory_slot
*slot
, gfn_t gfn
,
2050 struct gfn_to_pfn_cache
*cache
, u64 gen
)
2052 kvm_release_pfn(cache
->pfn
, cache
->dirty
, cache
);
2054 cache
->pfn
= gfn_to_pfn_memslot(slot
, gfn
);
2056 cache
->dirty
= false;
2057 cache
->generation
= gen
;
2060 static int __kvm_map_gfn(struct kvm_memslots
*slots
, gfn_t gfn
,
2061 struct kvm_host_map
*map
,
2062 struct gfn_to_pfn_cache
*cache
,
2067 struct page
*page
= KVM_UNMAPPED_PAGE
;
2068 struct kvm_memory_slot
*slot
= __gfn_to_memslot(slots
, gfn
);
2069 u64 gen
= slots
->generation
;
2075 if (!cache
->pfn
|| cache
->gfn
!= gfn
||
2076 cache
->generation
!= gen
) {
2079 kvm_cache_gfn_to_pfn(slot
, gfn
, cache
, gen
);
2085 pfn
= gfn_to_pfn_memslot(slot
, gfn
);
2087 if (is_error_noslot_pfn(pfn
))
2090 if (pfn_valid(pfn
)) {
2091 page
= pfn_to_page(pfn
);
2093 hva
= kmap_atomic(page
);
2096 #ifdef CONFIG_HAS_IOMEM
2097 } else if (!atomic
) {
2098 hva
= memremap(pfn_to_hpa(pfn
), PAGE_SIZE
, MEMREMAP_WB
);
2115 int kvm_map_gfn(struct kvm_vcpu
*vcpu
, gfn_t gfn
, struct kvm_host_map
*map
,
2116 struct gfn_to_pfn_cache
*cache
, bool atomic
)
2118 return __kvm_map_gfn(kvm_memslots(vcpu
->kvm
), gfn
, map
,
2121 EXPORT_SYMBOL_GPL(kvm_map_gfn
);
2123 int kvm_vcpu_map(struct kvm_vcpu
*vcpu
, gfn_t gfn
, struct kvm_host_map
*map
)
2125 return __kvm_map_gfn(kvm_vcpu_memslots(vcpu
), gfn
, map
,
2128 EXPORT_SYMBOL_GPL(kvm_vcpu_map
);
2130 static void __kvm_unmap_gfn(struct kvm_memory_slot
*memslot
,
2131 struct kvm_host_map
*map
,
2132 struct gfn_to_pfn_cache
*cache
,
2133 bool dirty
, bool atomic
)
2141 if (map
->page
!= KVM_UNMAPPED_PAGE
) {
2143 kunmap_atomic(map
->hva
);
2147 #ifdef CONFIG_HAS_IOMEM
2151 WARN_ONCE(1, "Unexpected unmapping in atomic context");
2155 mark_page_dirty_in_slot(memslot
, map
->gfn
);
2158 cache
->dirty
|= dirty
;
2160 kvm_release_pfn(map
->pfn
, dirty
, NULL
);
2166 int kvm_unmap_gfn(struct kvm_vcpu
*vcpu
, struct kvm_host_map
*map
,
2167 struct gfn_to_pfn_cache
*cache
, bool dirty
, bool atomic
)
2169 __kvm_unmap_gfn(gfn_to_memslot(vcpu
->kvm
, map
->gfn
), map
,
2170 cache
, dirty
, atomic
);
2173 EXPORT_SYMBOL_GPL(kvm_unmap_gfn
);
2175 void kvm_vcpu_unmap(struct kvm_vcpu
*vcpu
, struct kvm_host_map
*map
, bool dirty
)
2177 __kvm_unmap_gfn(kvm_vcpu_gfn_to_memslot(vcpu
, map
->gfn
), map
, NULL
,
2180 EXPORT_SYMBOL_GPL(kvm_vcpu_unmap
);
2182 struct page
*kvm_vcpu_gfn_to_page(struct kvm_vcpu
*vcpu
, gfn_t gfn
)
2186 pfn
= kvm_vcpu_gfn_to_pfn(vcpu
, gfn
);
2188 return kvm_pfn_to_page(pfn
);
2190 EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_page
);
2192 void kvm_release_page_clean(struct page
*page
)
2194 WARN_ON(is_error_page(page
));
2196 kvm_release_pfn_clean(page_to_pfn(page
));
2198 EXPORT_SYMBOL_GPL(kvm_release_page_clean
);
2200 void kvm_release_pfn_clean(kvm_pfn_t pfn
)
2202 if (!is_error_noslot_pfn(pfn
) && !kvm_is_reserved_pfn(pfn
))
2203 put_page(pfn_to_page(pfn
));
2205 EXPORT_SYMBOL_GPL(kvm_release_pfn_clean
);
2207 void kvm_release_page_dirty(struct page
*page
)
2209 WARN_ON(is_error_page(page
));
2211 kvm_release_pfn_dirty(page_to_pfn(page
));
2213 EXPORT_SYMBOL_GPL(kvm_release_page_dirty
);
2215 void kvm_release_pfn_dirty(kvm_pfn_t pfn
)
2217 kvm_set_pfn_dirty(pfn
);
2218 kvm_release_pfn_clean(pfn
);
2220 EXPORT_SYMBOL_GPL(kvm_release_pfn_dirty
);
2222 void kvm_set_pfn_dirty(kvm_pfn_t pfn
)
2224 if (!kvm_is_reserved_pfn(pfn
) && !kvm_is_zone_device_pfn(pfn
))
2225 SetPageDirty(pfn_to_page(pfn
));
2227 EXPORT_SYMBOL_GPL(kvm_set_pfn_dirty
);
2229 void kvm_set_pfn_accessed(kvm_pfn_t pfn
)
2231 if (!kvm_is_reserved_pfn(pfn
) && !kvm_is_zone_device_pfn(pfn
))
2232 mark_page_accessed(pfn_to_page(pfn
));
2234 EXPORT_SYMBOL_GPL(kvm_set_pfn_accessed
);
2236 void kvm_get_pfn(kvm_pfn_t pfn
)
2238 if (!kvm_is_reserved_pfn(pfn
))
2239 get_page(pfn_to_page(pfn
));
2241 EXPORT_SYMBOL_GPL(kvm_get_pfn
);
2243 static int next_segment(unsigned long len
, int offset
)
2245 if (len
> PAGE_SIZE
- offset
)
2246 return PAGE_SIZE
- offset
;
2251 static int __kvm_read_guest_page(struct kvm_memory_slot
*slot
, gfn_t gfn
,
2252 void *data
, int offset
, int len
)
2257 addr
= gfn_to_hva_memslot_prot(slot
, gfn
, NULL
);
2258 if (kvm_is_error_hva(addr
))
2260 r
= __copy_from_user(data
, (void __user
*)addr
+ offset
, len
);
2266 int kvm_read_guest_page(struct kvm
*kvm
, gfn_t gfn
, void *data
, int offset
,
2269 struct kvm_memory_slot
*slot
= gfn_to_memslot(kvm
, gfn
);
2271 return __kvm_read_guest_page(slot
, gfn
, data
, offset
, len
);
2273 EXPORT_SYMBOL_GPL(kvm_read_guest_page
);
2275 int kvm_vcpu_read_guest_page(struct kvm_vcpu
*vcpu
, gfn_t gfn
, void *data
,
2276 int offset
, int len
)
2278 struct kvm_memory_slot
*slot
= kvm_vcpu_gfn_to_memslot(vcpu
, gfn
);
2280 return __kvm_read_guest_page(slot
, gfn
, data
, offset
, len
);
2282 EXPORT_SYMBOL_GPL(kvm_vcpu_read_guest_page
);
2284 int kvm_read_guest(struct kvm
*kvm
, gpa_t gpa
, void *data
, unsigned long len
)
2286 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
2288 int offset
= offset_in_page(gpa
);
2291 while ((seg
= next_segment(len
, offset
)) != 0) {
2292 ret
= kvm_read_guest_page(kvm
, gfn
, data
, offset
, seg
);
2302 EXPORT_SYMBOL_GPL(kvm_read_guest
);
2304 int kvm_vcpu_read_guest(struct kvm_vcpu
*vcpu
, gpa_t gpa
, void *data
, unsigned long len
)
2306 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
2308 int offset
= offset_in_page(gpa
);
2311 while ((seg
= next_segment(len
, offset
)) != 0) {
2312 ret
= kvm_vcpu_read_guest_page(vcpu
, gfn
, data
, offset
, seg
);
2322 EXPORT_SYMBOL_GPL(kvm_vcpu_read_guest
);
2324 static int __kvm_read_guest_atomic(struct kvm_memory_slot
*slot
, gfn_t gfn
,
2325 void *data
, int offset
, unsigned long len
)
2330 addr
= gfn_to_hva_memslot_prot(slot
, gfn
, NULL
);
2331 if (kvm_is_error_hva(addr
))
2333 pagefault_disable();
2334 r
= __copy_from_user_inatomic(data
, (void __user
*)addr
+ offset
, len
);
2341 int kvm_vcpu_read_guest_atomic(struct kvm_vcpu
*vcpu
, gpa_t gpa
,
2342 void *data
, unsigned long len
)
2344 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
2345 struct kvm_memory_slot
*slot
= kvm_vcpu_gfn_to_memslot(vcpu
, gfn
);
2346 int offset
= offset_in_page(gpa
);
2348 return __kvm_read_guest_atomic(slot
, gfn
, data
, offset
, len
);
2350 EXPORT_SYMBOL_GPL(kvm_vcpu_read_guest_atomic
);
2352 static int __kvm_write_guest_page(struct kvm_memory_slot
*memslot
, gfn_t gfn
,
2353 const void *data
, int offset
, int len
)
2358 addr
= gfn_to_hva_memslot(memslot
, gfn
);
2359 if (kvm_is_error_hva(addr
))
2361 r
= __copy_to_user((void __user
*)addr
+ offset
, data
, len
);
2364 mark_page_dirty_in_slot(memslot
, gfn
);
2368 int kvm_write_guest_page(struct kvm
*kvm
, gfn_t gfn
,
2369 const void *data
, int offset
, int len
)
2371 struct kvm_memory_slot
*slot
= gfn_to_memslot(kvm
, gfn
);
2373 return __kvm_write_guest_page(slot
, gfn
, data
, offset
, len
);
2375 EXPORT_SYMBOL_GPL(kvm_write_guest_page
);
2377 int kvm_vcpu_write_guest_page(struct kvm_vcpu
*vcpu
, gfn_t gfn
,
2378 const void *data
, int offset
, int len
)
2380 struct kvm_memory_slot
*slot
= kvm_vcpu_gfn_to_memslot(vcpu
, gfn
);
2382 return __kvm_write_guest_page(slot
, gfn
, data
, offset
, len
);
2384 EXPORT_SYMBOL_GPL(kvm_vcpu_write_guest_page
);
2386 int kvm_write_guest(struct kvm
*kvm
, gpa_t gpa
, const void *data
,
2389 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
2391 int offset
= offset_in_page(gpa
);
2394 while ((seg
= next_segment(len
, offset
)) != 0) {
2395 ret
= kvm_write_guest_page(kvm
, gfn
, data
, offset
, seg
);
2405 EXPORT_SYMBOL_GPL(kvm_write_guest
);
2407 int kvm_vcpu_write_guest(struct kvm_vcpu
*vcpu
, gpa_t gpa
, const void *data
,
2410 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
2412 int offset
= offset_in_page(gpa
);
2415 while ((seg
= next_segment(len
, offset
)) != 0) {
2416 ret
= kvm_vcpu_write_guest_page(vcpu
, gfn
, data
, offset
, seg
);
2426 EXPORT_SYMBOL_GPL(kvm_vcpu_write_guest
);
2428 static int __kvm_gfn_to_hva_cache_init(struct kvm_memslots
*slots
,
2429 struct gfn_to_hva_cache
*ghc
,
2430 gpa_t gpa
, unsigned long len
)
2432 int offset
= offset_in_page(gpa
);
2433 gfn_t start_gfn
= gpa
>> PAGE_SHIFT
;
2434 gfn_t end_gfn
= (gpa
+ len
- 1) >> PAGE_SHIFT
;
2435 gfn_t nr_pages_needed
= end_gfn
- start_gfn
+ 1;
2436 gfn_t nr_pages_avail
;
2438 /* Update ghc->generation before performing any error checks. */
2439 ghc
->generation
= slots
->generation
;
2441 if (start_gfn
> end_gfn
) {
2442 ghc
->hva
= KVM_HVA_ERR_BAD
;
2447 * If the requested region crosses two memslots, we still
2448 * verify that the entire region is valid here.
2450 for ( ; start_gfn
<= end_gfn
; start_gfn
+= nr_pages_avail
) {
2451 ghc
->memslot
= __gfn_to_memslot(slots
, start_gfn
);
2452 ghc
->hva
= gfn_to_hva_many(ghc
->memslot
, start_gfn
,
2454 if (kvm_is_error_hva(ghc
->hva
))
2458 /* Use the slow path for cross page reads and writes. */
2459 if (nr_pages_needed
== 1)
2462 ghc
->memslot
= NULL
;
2469 int kvm_gfn_to_hva_cache_init(struct kvm
*kvm
, struct gfn_to_hva_cache
*ghc
,
2470 gpa_t gpa
, unsigned long len
)
2472 struct kvm_memslots
*slots
= kvm_memslots(kvm
);
2473 return __kvm_gfn_to_hva_cache_init(slots
, ghc
, gpa
, len
);
2475 EXPORT_SYMBOL_GPL(kvm_gfn_to_hva_cache_init
);
2477 int kvm_write_guest_offset_cached(struct kvm
*kvm
, struct gfn_to_hva_cache
*ghc
,
2478 void *data
, unsigned int offset
,
2481 struct kvm_memslots
*slots
= kvm_memslots(kvm
);
2483 gpa_t gpa
= ghc
->gpa
+ offset
;
2485 BUG_ON(len
+ offset
> ghc
->len
);
2487 if (slots
->generation
!= ghc
->generation
) {
2488 if (__kvm_gfn_to_hva_cache_init(slots
, ghc
, ghc
->gpa
, ghc
->len
))
2492 if (kvm_is_error_hva(ghc
->hva
))
2495 if (unlikely(!ghc
->memslot
))
2496 return kvm_write_guest(kvm
, gpa
, data
, len
);
2498 r
= __copy_to_user((void __user
*)ghc
->hva
+ offset
, data
, len
);
2501 mark_page_dirty_in_slot(ghc
->memslot
, gpa
>> PAGE_SHIFT
);
2505 EXPORT_SYMBOL_GPL(kvm_write_guest_offset_cached
);
2507 int kvm_write_guest_cached(struct kvm
*kvm
, struct gfn_to_hva_cache
*ghc
,
2508 void *data
, unsigned long len
)
2510 return kvm_write_guest_offset_cached(kvm
, ghc
, data
, 0, len
);
2512 EXPORT_SYMBOL_GPL(kvm_write_guest_cached
);
2514 int kvm_read_guest_cached(struct kvm
*kvm
, struct gfn_to_hva_cache
*ghc
,
2515 void *data
, unsigned long len
)
2517 struct kvm_memslots
*slots
= kvm_memslots(kvm
);
2520 BUG_ON(len
> ghc
->len
);
2522 if (slots
->generation
!= ghc
->generation
) {
2523 if (__kvm_gfn_to_hva_cache_init(slots
, ghc
, ghc
->gpa
, ghc
->len
))
2527 if (kvm_is_error_hva(ghc
->hva
))
2530 if (unlikely(!ghc
->memslot
))
2531 return kvm_read_guest(kvm
, ghc
->gpa
, data
, len
);
2533 r
= __copy_from_user(data
, (void __user
*)ghc
->hva
, len
);
2539 EXPORT_SYMBOL_GPL(kvm_read_guest_cached
);
2541 int kvm_clear_guest_page(struct kvm
*kvm
, gfn_t gfn
, int offset
, int len
)
2543 const void *zero_page
= (const void *) __va(page_to_phys(ZERO_PAGE(0)));
2545 return kvm_write_guest_page(kvm
, gfn
, zero_page
, offset
, len
);
2547 EXPORT_SYMBOL_GPL(kvm_clear_guest_page
);
2549 int kvm_clear_guest(struct kvm
*kvm
, gpa_t gpa
, unsigned long len
)
2551 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
2553 int offset
= offset_in_page(gpa
);
2556 while ((seg
= next_segment(len
, offset
)) != 0) {
2557 ret
= kvm_clear_guest_page(kvm
, gfn
, offset
, seg
);
2566 EXPORT_SYMBOL_GPL(kvm_clear_guest
);
2568 static void mark_page_dirty_in_slot(struct kvm_memory_slot
*memslot
,
2571 if (memslot
&& memslot
->dirty_bitmap
) {
2572 unsigned long rel_gfn
= gfn
- memslot
->base_gfn
;
2574 set_bit_le(rel_gfn
, memslot
->dirty_bitmap
);
2578 void mark_page_dirty(struct kvm
*kvm
, gfn_t gfn
)
2580 struct kvm_memory_slot
*memslot
;
2582 memslot
= gfn_to_memslot(kvm
, gfn
);
2583 mark_page_dirty_in_slot(memslot
, gfn
);
2585 EXPORT_SYMBOL_GPL(mark_page_dirty
);
2587 void kvm_vcpu_mark_page_dirty(struct kvm_vcpu
*vcpu
, gfn_t gfn
)
2589 struct kvm_memory_slot
*memslot
;
2591 memslot
= kvm_vcpu_gfn_to_memslot(vcpu
, gfn
);
2592 mark_page_dirty_in_slot(memslot
, gfn
);
2594 EXPORT_SYMBOL_GPL(kvm_vcpu_mark_page_dirty
);
2596 void kvm_sigset_activate(struct kvm_vcpu
*vcpu
)
2598 if (!vcpu
->sigset_active
)
2602 * This does a lockless modification of ->real_blocked, which is fine
2603 * because, only current can change ->real_blocked and all readers of
2604 * ->real_blocked don't care as long ->real_blocked is always a subset
2607 sigprocmask(SIG_SETMASK
, &vcpu
->sigset
, ¤t
->real_blocked
);
2610 void kvm_sigset_deactivate(struct kvm_vcpu
*vcpu
)
2612 if (!vcpu
->sigset_active
)
2615 sigprocmask(SIG_SETMASK
, ¤t
->real_blocked
, NULL
);
2616 sigemptyset(¤t
->real_blocked
);
2619 static void grow_halt_poll_ns(struct kvm_vcpu
*vcpu
)
2621 unsigned int old
, val
, grow
, grow_start
;
2623 old
= val
= vcpu
->halt_poll_ns
;
2624 grow_start
= READ_ONCE(halt_poll_ns_grow_start
);
2625 grow
= READ_ONCE(halt_poll_ns_grow
);
2630 if (val
< grow_start
)
2633 if (val
> halt_poll_ns
)
2636 vcpu
->halt_poll_ns
= val
;
2638 trace_kvm_halt_poll_ns_grow(vcpu
->vcpu_id
, val
, old
);
2641 static void shrink_halt_poll_ns(struct kvm_vcpu
*vcpu
)
2643 unsigned int old
, val
, shrink
;
2645 old
= val
= vcpu
->halt_poll_ns
;
2646 shrink
= READ_ONCE(halt_poll_ns_shrink
);
2652 vcpu
->halt_poll_ns
= val
;
2653 trace_kvm_halt_poll_ns_shrink(vcpu
->vcpu_id
, val
, old
);
2656 static int kvm_vcpu_check_block(struct kvm_vcpu
*vcpu
)
2659 int idx
= srcu_read_lock(&vcpu
->kvm
->srcu
);
2661 if (kvm_arch_vcpu_runnable(vcpu
)) {
2662 kvm_make_request(KVM_REQ_UNHALT
, vcpu
);
2665 if (kvm_cpu_has_pending_timer(vcpu
))
2667 if (signal_pending(current
))
2672 srcu_read_unlock(&vcpu
->kvm
->srcu
, idx
);
2677 * The vCPU has executed a HLT instruction with in-kernel mode enabled.
2679 void kvm_vcpu_block(struct kvm_vcpu
*vcpu
)
2682 DECLARE_SWAITQUEUE(wait
);
2683 bool waited
= false;
2686 kvm_arch_vcpu_blocking(vcpu
);
2688 start
= cur
= ktime_get();
2689 if (vcpu
->halt_poll_ns
&& !kvm_arch_no_poll(vcpu
)) {
2690 ktime_t stop
= ktime_add_ns(ktime_get(), vcpu
->halt_poll_ns
);
2692 ++vcpu
->stat
.halt_attempted_poll
;
2695 * This sets KVM_REQ_UNHALT if an interrupt
2698 if (kvm_vcpu_check_block(vcpu
) < 0) {
2699 ++vcpu
->stat
.halt_successful_poll
;
2700 if (!vcpu_valid_wakeup(vcpu
))
2701 ++vcpu
->stat
.halt_poll_invalid
;
2705 } while (single_task_running() && ktime_before(cur
, stop
));
2709 prepare_to_swait_exclusive(&vcpu
->wq
, &wait
, TASK_INTERRUPTIBLE
);
2711 if (kvm_vcpu_check_block(vcpu
) < 0)
2718 finish_swait(&vcpu
->wq
, &wait
);
2721 kvm_arch_vcpu_unblocking(vcpu
);
2722 block_ns
= ktime_to_ns(cur
) - ktime_to_ns(start
);
2724 if (!kvm_arch_no_poll(vcpu
)) {
2725 if (!vcpu_valid_wakeup(vcpu
)) {
2726 shrink_halt_poll_ns(vcpu
);
2727 } else if (halt_poll_ns
) {
2728 if (block_ns
<= vcpu
->halt_poll_ns
)
2730 /* we had a long block, shrink polling */
2731 else if (vcpu
->halt_poll_ns
&& block_ns
> halt_poll_ns
)
2732 shrink_halt_poll_ns(vcpu
);
2733 /* we had a short halt and our poll time is too small */
2734 else if (vcpu
->halt_poll_ns
< halt_poll_ns
&&
2735 block_ns
< halt_poll_ns
)
2736 grow_halt_poll_ns(vcpu
);
2738 vcpu
->halt_poll_ns
= 0;
2742 trace_kvm_vcpu_wakeup(block_ns
, waited
, vcpu_valid_wakeup(vcpu
));
2743 kvm_arch_vcpu_block_finish(vcpu
);
2745 EXPORT_SYMBOL_GPL(kvm_vcpu_block
);
2747 bool kvm_vcpu_wake_up(struct kvm_vcpu
*vcpu
)
2749 struct swait_queue_head
*wqp
;
2751 wqp
= kvm_arch_vcpu_wq(vcpu
);
2752 if (swq_has_sleeper(wqp
)) {
2754 WRITE_ONCE(vcpu
->ready
, true);
2755 ++vcpu
->stat
.halt_wakeup
;
2761 EXPORT_SYMBOL_GPL(kvm_vcpu_wake_up
);
2765 * Kick a sleeping VCPU, or a guest VCPU in guest mode, into host kernel mode.
2767 void kvm_vcpu_kick(struct kvm_vcpu
*vcpu
)
2770 int cpu
= vcpu
->cpu
;
2772 if (kvm_vcpu_wake_up(vcpu
))
2776 if (cpu
!= me
&& (unsigned)cpu
< nr_cpu_ids
&& cpu_online(cpu
))
2777 if (kvm_arch_vcpu_should_kick(vcpu
))
2778 smp_send_reschedule(cpu
);
2781 EXPORT_SYMBOL_GPL(kvm_vcpu_kick
);
2782 #endif /* !CONFIG_S390 */
2784 int kvm_vcpu_yield_to(struct kvm_vcpu
*target
)
2787 struct task_struct
*task
= NULL
;
2791 pid
= rcu_dereference(target
->pid
);
2793 task
= get_pid_task(pid
, PIDTYPE_PID
);
2797 ret
= yield_to(task
, 1);
2798 put_task_struct(task
);
2802 EXPORT_SYMBOL_GPL(kvm_vcpu_yield_to
);
2805 * Helper that checks whether a VCPU is eligible for directed yield.
2806 * Most eligible candidate to yield is decided by following heuristics:
2808 * (a) VCPU which has not done pl-exit or cpu relax intercepted recently
2809 * (preempted lock holder), indicated by @in_spin_loop.
2810 * Set at the beiginning and cleared at the end of interception/PLE handler.
2812 * (b) VCPU which has done pl-exit/ cpu relax intercepted but did not get
2813 * chance last time (mostly it has become eligible now since we have probably
2814 * yielded to lockholder in last iteration. This is done by toggling
2815 * @dy_eligible each time a VCPU checked for eligibility.)
2817 * Yielding to a recently pl-exited/cpu relax intercepted VCPU before yielding
2818 * to preempted lock-holder could result in wrong VCPU selection and CPU
2819 * burning. Giving priority for a potential lock-holder increases lock
2822 * Since algorithm is based on heuristics, accessing another VCPU data without
2823 * locking does not harm. It may result in trying to yield to same VCPU, fail
2824 * and continue with next VCPU and so on.
2826 static bool kvm_vcpu_eligible_for_directed_yield(struct kvm_vcpu
*vcpu
)
2828 #ifdef CONFIG_HAVE_KVM_CPU_RELAX_INTERCEPT
2831 eligible
= !vcpu
->spin_loop
.in_spin_loop
||
2832 vcpu
->spin_loop
.dy_eligible
;
2834 if (vcpu
->spin_loop
.in_spin_loop
)
2835 kvm_vcpu_set_dy_eligible(vcpu
, !vcpu
->spin_loop
.dy_eligible
);
2844 * Unlike kvm_arch_vcpu_runnable, this function is called outside
2845 * a vcpu_load/vcpu_put pair. However, for most architectures
2846 * kvm_arch_vcpu_runnable does not require vcpu_load.
2848 bool __weak
kvm_arch_dy_runnable(struct kvm_vcpu
*vcpu
)
2850 return kvm_arch_vcpu_runnable(vcpu
);
2853 static bool vcpu_dy_runnable(struct kvm_vcpu
*vcpu
)
2855 if (kvm_arch_dy_runnable(vcpu
))
2858 #ifdef CONFIG_KVM_ASYNC_PF
2859 if (!list_empty_careful(&vcpu
->async_pf
.done
))
2866 void kvm_vcpu_on_spin(struct kvm_vcpu
*me
, bool yield_to_kernel_mode
)
2868 struct kvm
*kvm
= me
->kvm
;
2869 struct kvm_vcpu
*vcpu
;
2870 int last_boosted_vcpu
= me
->kvm
->last_boosted_vcpu
;
2876 kvm_vcpu_set_in_spin_loop(me
, true);
2878 * We boost the priority of a VCPU that is runnable but not
2879 * currently running, because it got preempted by something
2880 * else and called schedule in __vcpu_run. Hopefully that
2881 * VCPU is holding the lock that we need and will release it.
2882 * We approximate round-robin by starting at the last boosted VCPU.
2884 for (pass
= 0; pass
< 2 && !yielded
&& try; pass
++) {
2885 kvm_for_each_vcpu(i
, vcpu
, kvm
) {
2886 if (!pass
&& i
<= last_boosted_vcpu
) {
2887 i
= last_boosted_vcpu
;
2889 } else if (pass
&& i
> last_boosted_vcpu
)
2891 if (!READ_ONCE(vcpu
->ready
))
2895 if (swait_active(&vcpu
->wq
) && !vcpu_dy_runnable(vcpu
))
2897 if (READ_ONCE(vcpu
->preempted
) && yield_to_kernel_mode
&&
2898 !kvm_arch_vcpu_in_kernel(vcpu
))
2900 if (!kvm_vcpu_eligible_for_directed_yield(vcpu
))
2903 yielded
= kvm_vcpu_yield_to(vcpu
);
2905 kvm
->last_boosted_vcpu
= i
;
2907 } else if (yielded
< 0) {
2914 kvm_vcpu_set_in_spin_loop(me
, false);
2916 /* Ensure vcpu is not eligible during next spinloop */
2917 kvm_vcpu_set_dy_eligible(me
, false);
2919 EXPORT_SYMBOL_GPL(kvm_vcpu_on_spin
);
2921 static vm_fault_t
kvm_vcpu_fault(struct vm_fault
*vmf
)
2923 struct kvm_vcpu
*vcpu
= vmf
->vma
->vm_file
->private_data
;
2926 if (vmf
->pgoff
== 0)
2927 page
= virt_to_page(vcpu
->run
);
2929 else if (vmf
->pgoff
== KVM_PIO_PAGE_OFFSET
)
2930 page
= virt_to_page(vcpu
->arch
.pio_data
);
2932 #ifdef CONFIG_KVM_MMIO
2933 else if (vmf
->pgoff
== KVM_COALESCED_MMIO_PAGE_OFFSET
)
2934 page
= virt_to_page(vcpu
->kvm
->coalesced_mmio_ring
);
2937 return kvm_arch_vcpu_fault(vcpu
, vmf
);
2943 static const struct vm_operations_struct kvm_vcpu_vm_ops
= {
2944 .fault
= kvm_vcpu_fault
,
2947 static int kvm_vcpu_mmap(struct file
*file
, struct vm_area_struct
*vma
)
2949 vma
->vm_ops
= &kvm_vcpu_vm_ops
;
2953 static int kvm_vcpu_release(struct inode
*inode
, struct file
*filp
)
2955 struct kvm_vcpu
*vcpu
= filp
->private_data
;
2957 debugfs_remove_recursive(vcpu
->debugfs_dentry
);
2958 kvm_put_kvm(vcpu
->kvm
);
2962 static struct file_operations kvm_vcpu_fops
= {
2963 .release
= kvm_vcpu_release
,
2964 .unlocked_ioctl
= kvm_vcpu_ioctl
,
2965 .mmap
= kvm_vcpu_mmap
,
2966 .llseek
= noop_llseek
,
2967 KVM_COMPAT(kvm_vcpu_compat_ioctl
),
2971 * Allocates an inode for the vcpu.
2973 static int create_vcpu_fd(struct kvm_vcpu
*vcpu
)
2975 char name
[8 + 1 + ITOA_MAX_LEN
+ 1];
2977 snprintf(name
, sizeof(name
), "kvm-vcpu:%d", vcpu
->vcpu_id
);
2978 return anon_inode_getfd(name
, &kvm_vcpu_fops
, vcpu
, O_RDWR
| O_CLOEXEC
);
2981 static void kvm_create_vcpu_debugfs(struct kvm_vcpu
*vcpu
)
2983 #ifdef __KVM_HAVE_ARCH_VCPU_DEBUGFS
2984 char dir_name
[ITOA_MAX_LEN
* 2];
2986 if (!debugfs_initialized())
2989 snprintf(dir_name
, sizeof(dir_name
), "vcpu%d", vcpu
->vcpu_id
);
2990 vcpu
->debugfs_dentry
= debugfs_create_dir(dir_name
,
2991 vcpu
->kvm
->debugfs_dentry
);
2993 kvm_arch_create_vcpu_debugfs(vcpu
);
2998 * Creates some virtual cpus. Good luck creating more than one.
3000 static int kvm_vm_ioctl_create_vcpu(struct kvm
*kvm
, u32 id
)
3003 struct kvm_vcpu
*vcpu
;
3006 if (id
>= KVM_MAX_VCPU_ID
)
3009 mutex_lock(&kvm
->lock
);
3010 if (kvm
->created_vcpus
== KVM_MAX_VCPUS
) {
3011 mutex_unlock(&kvm
->lock
);
3015 kvm
->created_vcpus
++;
3016 mutex_unlock(&kvm
->lock
);
3018 r
= kvm_arch_vcpu_precreate(kvm
, id
);
3020 goto vcpu_decrement
;
3022 vcpu
= kmem_cache_zalloc(kvm_vcpu_cache
, GFP_KERNEL
);
3025 goto vcpu_decrement
;
3028 BUILD_BUG_ON(sizeof(struct kvm_run
) > PAGE_SIZE
);
3029 page
= alloc_page(GFP_KERNEL
| __GFP_ZERO
);
3034 vcpu
->run
= page_address(page
);
3036 kvm_vcpu_init(vcpu
, kvm
, id
);
3038 r
= kvm_arch_vcpu_create(vcpu
);
3040 goto vcpu_free_run_page
;
3042 kvm_create_vcpu_debugfs(vcpu
);
3044 mutex_lock(&kvm
->lock
);
3045 if (kvm_get_vcpu_by_id(kvm
, id
)) {
3047 goto unlock_vcpu_destroy
;
3050 vcpu
->vcpu_idx
= atomic_read(&kvm
->online_vcpus
);
3051 BUG_ON(kvm
->vcpus
[vcpu
->vcpu_idx
]);
3053 /* Now it's all set up, let userspace reach it */
3055 r
= create_vcpu_fd(vcpu
);
3057 kvm_put_kvm_no_destroy(kvm
);
3058 goto unlock_vcpu_destroy
;
3061 kvm
->vcpus
[vcpu
->vcpu_idx
] = vcpu
;
3064 * Pairs with smp_rmb() in kvm_get_vcpu. Write kvm->vcpus
3065 * before kvm->online_vcpu's incremented value.
3068 atomic_inc(&kvm
->online_vcpus
);
3070 mutex_unlock(&kvm
->lock
);
3071 kvm_arch_vcpu_postcreate(vcpu
);
3074 unlock_vcpu_destroy
:
3075 mutex_unlock(&kvm
->lock
);
3076 debugfs_remove_recursive(vcpu
->debugfs_dentry
);
3077 kvm_arch_vcpu_destroy(vcpu
);
3079 free_page((unsigned long)vcpu
->run
);
3081 kmem_cache_free(kvm_vcpu_cache
, vcpu
);
3083 mutex_lock(&kvm
->lock
);
3084 kvm
->created_vcpus
--;
3085 mutex_unlock(&kvm
->lock
);
3089 static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu
*vcpu
, sigset_t
*sigset
)
3092 sigdelsetmask(sigset
, sigmask(SIGKILL
)|sigmask(SIGSTOP
));
3093 vcpu
->sigset_active
= 1;
3094 vcpu
->sigset
= *sigset
;
3096 vcpu
->sigset_active
= 0;
3100 static long kvm_vcpu_ioctl(struct file
*filp
,
3101 unsigned int ioctl
, unsigned long arg
)
3103 struct kvm_vcpu
*vcpu
= filp
->private_data
;
3104 void __user
*argp
= (void __user
*)arg
;
3106 struct kvm_fpu
*fpu
= NULL
;
3107 struct kvm_sregs
*kvm_sregs
= NULL
;
3109 if (vcpu
->kvm
->mm
!= current
->mm
)
3112 if (unlikely(_IOC_TYPE(ioctl
) != KVMIO
))
3116 * Some architectures have vcpu ioctls that are asynchronous to vcpu
3117 * execution; mutex_lock() would break them.
3119 r
= kvm_arch_vcpu_async_ioctl(filp
, ioctl
, arg
);
3120 if (r
!= -ENOIOCTLCMD
)
3123 if (mutex_lock_killable(&vcpu
->mutex
))
3131 oldpid
= rcu_access_pointer(vcpu
->pid
);
3132 if (unlikely(oldpid
!= task_pid(current
))) {
3133 /* The thread running this VCPU changed. */
3136 r
= kvm_arch_vcpu_run_pid_change(vcpu
);
3140 newpid
= get_task_pid(current
, PIDTYPE_PID
);
3141 rcu_assign_pointer(vcpu
->pid
, newpid
);
3146 r
= kvm_arch_vcpu_ioctl_run(vcpu
, vcpu
->run
);
3147 trace_kvm_userspace_exit(vcpu
->run
->exit_reason
, r
);
3150 case KVM_GET_REGS
: {
3151 struct kvm_regs
*kvm_regs
;
3154 kvm_regs
= kzalloc(sizeof(struct kvm_regs
), GFP_KERNEL_ACCOUNT
);
3157 r
= kvm_arch_vcpu_ioctl_get_regs(vcpu
, kvm_regs
);
3161 if (copy_to_user(argp
, kvm_regs
, sizeof(struct kvm_regs
)))
3168 case KVM_SET_REGS
: {
3169 struct kvm_regs
*kvm_regs
;
3172 kvm_regs
= memdup_user(argp
, sizeof(*kvm_regs
));
3173 if (IS_ERR(kvm_regs
)) {
3174 r
= PTR_ERR(kvm_regs
);
3177 r
= kvm_arch_vcpu_ioctl_set_regs(vcpu
, kvm_regs
);
3181 case KVM_GET_SREGS
: {
3182 kvm_sregs
= kzalloc(sizeof(struct kvm_sregs
),
3183 GFP_KERNEL_ACCOUNT
);
3187 r
= kvm_arch_vcpu_ioctl_get_sregs(vcpu
, kvm_sregs
);
3191 if (copy_to_user(argp
, kvm_sregs
, sizeof(struct kvm_sregs
)))
3196 case KVM_SET_SREGS
: {
3197 kvm_sregs
= memdup_user(argp
, sizeof(*kvm_sregs
));
3198 if (IS_ERR(kvm_sregs
)) {
3199 r
= PTR_ERR(kvm_sregs
);
3203 r
= kvm_arch_vcpu_ioctl_set_sregs(vcpu
, kvm_sregs
);
3206 case KVM_GET_MP_STATE
: {
3207 struct kvm_mp_state mp_state
;
3209 r
= kvm_arch_vcpu_ioctl_get_mpstate(vcpu
, &mp_state
);
3213 if (copy_to_user(argp
, &mp_state
, sizeof(mp_state
)))
3218 case KVM_SET_MP_STATE
: {
3219 struct kvm_mp_state mp_state
;
3222 if (copy_from_user(&mp_state
, argp
, sizeof(mp_state
)))
3224 r
= kvm_arch_vcpu_ioctl_set_mpstate(vcpu
, &mp_state
);
3227 case KVM_TRANSLATE
: {
3228 struct kvm_translation tr
;
3231 if (copy_from_user(&tr
, argp
, sizeof(tr
)))
3233 r
= kvm_arch_vcpu_ioctl_translate(vcpu
, &tr
);
3237 if (copy_to_user(argp
, &tr
, sizeof(tr
)))
3242 case KVM_SET_GUEST_DEBUG
: {
3243 struct kvm_guest_debug dbg
;
3246 if (copy_from_user(&dbg
, argp
, sizeof(dbg
)))
3248 r
= kvm_arch_vcpu_ioctl_set_guest_debug(vcpu
, &dbg
);
3251 case KVM_SET_SIGNAL_MASK
: {
3252 struct kvm_signal_mask __user
*sigmask_arg
= argp
;
3253 struct kvm_signal_mask kvm_sigmask
;
3254 sigset_t sigset
, *p
;
3259 if (copy_from_user(&kvm_sigmask
, argp
,
3260 sizeof(kvm_sigmask
)))
3263 if (kvm_sigmask
.len
!= sizeof(sigset
))
3266 if (copy_from_user(&sigset
, sigmask_arg
->sigset
,
3271 r
= kvm_vcpu_ioctl_set_sigmask(vcpu
, p
);
3275 fpu
= kzalloc(sizeof(struct kvm_fpu
), GFP_KERNEL_ACCOUNT
);
3279 r
= kvm_arch_vcpu_ioctl_get_fpu(vcpu
, fpu
);
3283 if (copy_to_user(argp
, fpu
, sizeof(struct kvm_fpu
)))
3289 fpu
= memdup_user(argp
, sizeof(*fpu
));
3295 r
= kvm_arch_vcpu_ioctl_set_fpu(vcpu
, fpu
);
3299 r
= kvm_arch_vcpu_ioctl(filp
, ioctl
, arg
);
3302 mutex_unlock(&vcpu
->mutex
);
3308 #ifdef CONFIG_KVM_COMPAT
3309 static long kvm_vcpu_compat_ioctl(struct file
*filp
,
3310 unsigned int ioctl
, unsigned long arg
)
3312 struct kvm_vcpu
*vcpu
= filp
->private_data
;
3313 void __user
*argp
= compat_ptr(arg
);
3316 if (vcpu
->kvm
->mm
!= current
->mm
)
3320 case KVM_SET_SIGNAL_MASK
: {
3321 struct kvm_signal_mask __user
*sigmask_arg
= argp
;
3322 struct kvm_signal_mask kvm_sigmask
;
3327 if (copy_from_user(&kvm_sigmask
, argp
,
3328 sizeof(kvm_sigmask
)))
3331 if (kvm_sigmask
.len
!= sizeof(compat_sigset_t
))
3334 if (get_compat_sigset(&sigset
, (void *)sigmask_arg
->sigset
))
3336 r
= kvm_vcpu_ioctl_set_sigmask(vcpu
, &sigset
);
3338 r
= kvm_vcpu_ioctl_set_sigmask(vcpu
, NULL
);
3342 r
= kvm_vcpu_ioctl(filp
, ioctl
, arg
);
3350 static int kvm_device_mmap(struct file
*filp
, struct vm_area_struct
*vma
)
3352 struct kvm_device
*dev
= filp
->private_data
;
3355 return dev
->ops
->mmap(dev
, vma
);
3360 static int kvm_device_ioctl_attr(struct kvm_device
*dev
,
3361 int (*accessor
)(struct kvm_device
*dev
,
3362 struct kvm_device_attr
*attr
),
3365 struct kvm_device_attr attr
;
3370 if (copy_from_user(&attr
, (void __user
*)arg
, sizeof(attr
)))
3373 return accessor(dev
, &attr
);
3376 static long kvm_device_ioctl(struct file
*filp
, unsigned int ioctl
,
3379 struct kvm_device
*dev
= filp
->private_data
;
3381 if (dev
->kvm
->mm
!= current
->mm
)
3385 case KVM_SET_DEVICE_ATTR
:
3386 return kvm_device_ioctl_attr(dev
, dev
->ops
->set_attr
, arg
);
3387 case KVM_GET_DEVICE_ATTR
:
3388 return kvm_device_ioctl_attr(dev
, dev
->ops
->get_attr
, arg
);
3389 case KVM_HAS_DEVICE_ATTR
:
3390 return kvm_device_ioctl_attr(dev
, dev
->ops
->has_attr
, arg
);
3392 if (dev
->ops
->ioctl
)
3393 return dev
->ops
->ioctl(dev
, ioctl
, arg
);
3399 static int kvm_device_release(struct inode
*inode
, struct file
*filp
)
3401 struct kvm_device
*dev
= filp
->private_data
;
3402 struct kvm
*kvm
= dev
->kvm
;
3404 if (dev
->ops
->release
) {
3405 mutex_lock(&kvm
->lock
);
3406 list_del(&dev
->vm_node
);
3407 dev
->ops
->release(dev
);
3408 mutex_unlock(&kvm
->lock
);
3415 static const struct file_operations kvm_device_fops
= {
3416 .unlocked_ioctl
= kvm_device_ioctl
,
3417 .release
= kvm_device_release
,
3418 KVM_COMPAT(kvm_device_ioctl
),
3419 .mmap
= kvm_device_mmap
,
3422 struct kvm_device
*kvm_device_from_filp(struct file
*filp
)
3424 if (filp
->f_op
!= &kvm_device_fops
)
3427 return filp
->private_data
;
3430 static const struct kvm_device_ops
*kvm_device_ops_table
[KVM_DEV_TYPE_MAX
] = {
3431 #ifdef CONFIG_KVM_MPIC
3432 [KVM_DEV_TYPE_FSL_MPIC_20
] = &kvm_mpic_ops
,
3433 [KVM_DEV_TYPE_FSL_MPIC_42
] = &kvm_mpic_ops
,
3437 int kvm_register_device_ops(const struct kvm_device_ops
*ops
, u32 type
)
3439 if (type
>= ARRAY_SIZE(kvm_device_ops_table
))
3442 if (kvm_device_ops_table
[type
] != NULL
)
3445 kvm_device_ops_table
[type
] = ops
;
3449 void kvm_unregister_device_ops(u32 type
)
3451 if (kvm_device_ops_table
[type
] != NULL
)
3452 kvm_device_ops_table
[type
] = NULL
;
3455 static int kvm_ioctl_create_device(struct kvm
*kvm
,
3456 struct kvm_create_device
*cd
)
3458 const struct kvm_device_ops
*ops
= NULL
;
3459 struct kvm_device
*dev
;
3460 bool test
= cd
->flags
& KVM_CREATE_DEVICE_TEST
;
3464 if (cd
->type
>= ARRAY_SIZE(kvm_device_ops_table
))
3467 type
= array_index_nospec(cd
->type
, ARRAY_SIZE(kvm_device_ops_table
));
3468 ops
= kvm_device_ops_table
[type
];
3475 dev
= kzalloc(sizeof(*dev
), GFP_KERNEL_ACCOUNT
);
3482 mutex_lock(&kvm
->lock
);
3483 ret
= ops
->create(dev
, type
);
3485 mutex_unlock(&kvm
->lock
);
3489 list_add(&dev
->vm_node
, &kvm
->devices
);
3490 mutex_unlock(&kvm
->lock
);
3496 ret
= anon_inode_getfd(ops
->name
, &kvm_device_fops
, dev
, O_RDWR
| O_CLOEXEC
);
3498 kvm_put_kvm_no_destroy(kvm
);
3499 mutex_lock(&kvm
->lock
);
3500 list_del(&dev
->vm_node
);
3501 mutex_unlock(&kvm
->lock
);
3510 static long kvm_vm_ioctl_check_extension_generic(struct kvm
*kvm
, long arg
)
3513 case KVM_CAP_USER_MEMORY
:
3514 case KVM_CAP_DESTROY_MEMORY_REGION_WORKS
:
3515 case KVM_CAP_JOIN_MEMORY_REGIONS_WORKS
:
3516 case KVM_CAP_INTERNAL_ERROR_DATA
:
3517 #ifdef CONFIG_HAVE_KVM_MSI
3518 case KVM_CAP_SIGNAL_MSI
:
3520 #ifdef CONFIG_HAVE_KVM_IRQFD
3522 case KVM_CAP_IRQFD_RESAMPLE
:
3524 case KVM_CAP_IOEVENTFD_ANY_LENGTH
:
3525 case KVM_CAP_CHECK_EXTENSION_VM
:
3526 case KVM_CAP_ENABLE_CAP_VM
:
3528 #ifdef CONFIG_KVM_MMIO
3529 case KVM_CAP_COALESCED_MMIO
:
3530 return KVM_COALESCED_MMIO_PAGE_OFFSET
;
3531 case KVM_CAP_COALESCED_PIO
:
3534 #ifdef CONFIG_KVM_GENERIC_DIRTYLOG_READ_PROTECT
3535 case KVM_CAP_MANUAL_DIRTY_LOG_PROTECT2
:
3536 return KVM_DIRTY_LOG_MANUAL_CAPS
;
3538 #ifdef CONFIG_HAVE_KVM_IRQ_ROUTING
3539 case KVM_CAP_IRQ_ROUTING
:
3540 return KVM_MAX_IRQ_ROUTES
;
3542 #if KVM_ADDRESS_SPACE_NUM > 1
3543 case KVM_CAP_MULTI_ADDRESS_SPACE
:
3544 return KVM_ADDRESS_SPACE_NUM
;
3546 case KVM_CAP_NR_MEMSLOTS
:
3547 return KVM_USER_MEM_SLOTS
;
3551 return kvm_vm_ioctl_check_extension(kvm
, arg
);
3554 int __attribute__((weak
)) kvm_vm_ioctl_enable_cap(struct kvm
*kvm
,
3555 struct kvm_enable_cap
*cap
)
3560 static int kvm_vm_ioctl_enable_cap_generic(struct kvm
*kvm
,
3561 struct kvm_enable_cap
*cap
)
3564 #ifdef CONFIG_KVM_GENERIC_DIRTYLOG_READ_PROTECT
3565 case KVM_CAP_MANUAL_DIRTY_LOG_PROTECT2
: {
3566 u64 allowed_options
= KVM_DIRTY_LOG_MANUAL_PROTECT_ENABLE
;
3568 if (cap
->args
[0] & KVM_DIRTY_LOG_MANUAL_PROTECT_ENABLE
)
3569 allowed_options
= KVM_DIRTY_LOG_MANUAL_CAPS
;
3571 if (cap
->flags
|| (cap
->args
[0] & ~allowed_options
))
3573 kvm
->manual_dirty_log_protect
= cap
->args
[0];
3578 return kvm_vm_ioctl_enable_cap(kvm
, cap
);
3582 static long kvm_vm_ioctl(struct file
*filp
,
3583 unsigned int ioctl
, unsigned long arg
)
3585 struct kvm
*kvm
= filp
->private_data
;
3586 void __user
*argp
= (void __user
*)arg
;
3589 if (kvm
->mm
!= current
->mm
)
3592 case KVM_CREATE_VCPU
:
3593 r
= kvm_vm_ioctl_create_vcpu(kvm
, arg
);
3595 case KVM_ENABLE_CAP
: {
3596 struct kvm_enable_cap cap
;
3599 if (copy_from_user(&cap
, argp
, sizeof(cap
)))
3601 r
= kvm_vm_ioctl_enable_cap_generic(kvm
, &cap
);
3604 case KVM_SET_USER_MEMORY_REGION
: {
3605 struct kvm_userspace_memory_region kvm_userspace_mem
;
3608 if (copy_from_user(&kvm_userspace_mem
, argp
,
3609 sizeof(kvm_userspace_mem
)))
3612 r
= kvm_vm_ioctl_set_memory_region(kvm
, &kvm_userspace_mem
);
3615 case KVM_GET_DIRTY_LOG
: {
3616 struct kvm_dirty_log log
;
3619 if (copy_from_user(&log
, argp
, sizeof(log
)))
3621 r
= kvm_vm_ioctl_get_dirty_log(kvm
, &log
);
3624 #ifdef CONFIG_KVM_GENERIC_DIRTYLOG_READ_PROTECT
3625 case KVM_CLEAR_DIRTY_LOG
: {
3626 struct kvm_clear_dirty_log log
;
3629 if (copy_from_user(&log
, argp
, sizeof(log
)))
3631 r
= kvm_vm_ioctl_clear_dirty_log(kvm
, &log
);
3635 #ifdef CONFIG_KVM_MMIO
3636 case KVM_REGISTER_COALESCED_MMIO
: {
3637 struct kvm_coalesced_mmio_zone zone
;
3640 if (copy_from_user(&zone
, argp
, sizeof(zone
)))
3642 r
= kvm_vm_ioctl_register_coalesced_mmio(kvm
, &zone
);
3645 case KVM_UNREGISTER_COALESCED_MMIO
: {
3646 struct kvm_coalesced_mmio_zone zone
;
3649 if (copy_from_user(&zone
, argp
, sizeof(zone
)))
3651 r
= kvm_vm_ioctl_unregister_coalesced_mmio(kvm
, &zone
);
3656 struct kvm_irqfd data
;
3659 if (copy_from_user(&data
, argp
, sizeof(data
)))
3661 r
= kvm_irqfd(kvm
, &data
);
3664 case KVM_IOEVENTFD
: {
3665 struct kvm_ioeventfd data
;
3668 if (copy_from_user(&data
, argp
, sizeof(data
)))
3670 r
= kvm_ioeventfd(kvm
, &data
);
3673 #ifdef CONFIG_HAVE_KVM_MSI
3674 case KVM_SIGNAL_MSI
: {
3678 if (copy_from_user(&msi
, argp
, sizeof(msi
)))
3680 r
= kvm_send_userspace_msi(kvm
, &msi
);
3684 #ifdef __KVM_HAVE_IRQ_LINE
3685 case KVM_IRQ_LINE_STATUS
:
3686 case KVM_IRQ_LINE
: {
3687 struct kvm_irq_level irq_event
;
3690 if (copy_from_user(&irq_event
, argp
, sizeof(irq_event
)))
3693 r
= kvm_vm_ioctl_irq_line(kvm
, &irq_event
,
3694 ioctl
== KVM_IRQ_LINE_STATUS
);
3699 if (ioctl
== KVM_IRQ_LINE_STATUS
) {
3700 if (copy_to_user(argp
, &irq_event
, sizeof(irq_event
)))
3708 #ifdef CONFIG_HAVE_KVM_IRQ_ROUTING
3709 case KVM_SET_GSI_ROUTING
: {
3710 struct kvm_irq_routing routing
;
3711 struct kvm_irq_routing __user
*urouting
;
3712 struct kvm_irq_routing_entry
*entries
= NULL
;
3715 if (copy_from_user(&routing
, argp
, sizeof(routing
)))
3718 if (!kvm_arch_can_set_irq_routing(kvm
))
3720 if (routing
.nr
> KVM_MAX_IRQ_ROUTES
)
3726 entries
= vmalloc(array_size(sizeof(*entries
),
3732 if (copy_from_user(entries
, urouting
->entries
,
3733 routing
.nr
* sizeof(*entries
)))
3734 goto out_free_irq_routing
;
3736 r
= kvm_set_irq_routing(kvm
, entries
, routing
.nr
,
3738 out_free_irq_routing
:
3742 #endif /* CONFIG_HAVE_KVM_IRQ_ROUTING */
3743 case KVM_CREATE_DEVICE
: {
3744 struct kvm_create_device cd
;
3747 if (copy_from_user(&cd
, argp
, sizeof(cd
)))
3750 r
= kvm_ioctl_create_device(kvm
, &cd
);
3755 if (copy_to_user(argp
, &cd
, sizeof(cd
)))
3761 case KVM_CHECK_EXTENSION
:
3762 r
= kvm_vm_ioctl_check_extension_generic(kvm
, arg
);
3765 r
= kvm_arch_vm_ioctl(filp
, ioctl
, arg
);
3771 #ifdef CONFIG_KVM_COMPAT
3772 struct compat_kvm_dirty_log
{
3776 compat_uptr_t dirty_bitmap
; /* one bit per page */
3781 static long kvm_vm_compat_ioctl(struct file
*filp
,
3782 unsigned int ioctl
, unsigned long arg
)
3784 struct kvm
*kvm
= filp
->private_data
;
3787 if (kvm
->mm
!= current
->mm
)
3790 case KVM_GET_DIRTY_LOG
: {
3791 struct compat_kvm_dirty_log compat_log
;
3792 struct kvm_dirty_log log
;
3794 if (copy_from_user(&compat_log
, (void __user
*)arg
,
3795 sizeof(compat_log
)))
3797 log
.slot
= compat_log
.slot
;
3798 log
.padding1
= compat_log
.padding1
;
3799 log
.padding2
= compat_log
.padding2
;
3800 log
.dirty_bitmap
= compat_ptr(compat_log
.dirty_bitmap
);
3802 r
= kvm_vm_ioctl_get_dirty_log(kvm
, &log
);
3806 r
= kvm_vm_ioctl(filp
, ioctl
, arg
);
3812 static struct file_operations kvm_vm_fops
= {
3813 .release
= kvm_vm_release
,
3814 .unlocked_ioctl
= kvm_vm_ioctl
,
3815 .llseek
= noop_llseek
,
3816 KVM_COMPAT(kvm_vm_compat_ioctl
),
3819 static int kvm_dev_ioctl_create_vm(unsigned long type
)
3825 kvm
= kvm_create_vm(type
);
3827 return PTR_ERR(kvm
);
3828 #ifdef CONFIG_KVM_MMIO
3829 r
= kvm_coalesced_mmio_init(kvm
);
3833 r
= get_unused_fd_flags(O_CLOEXEC
);
3837 file
= anon_inode_getfile("kvm-vm", &kvm_vm_fops
, kvm
, O_RDWR
);
3845 * Don't call kvm_put_kvm anymore at this point; file->f_op is
3846 * already set, with ->release() being kvm_vm_release(). In error
3847 * cases it will be called by the final fput(file) and will take
3848 * care of doing kvm_put_kvm(kvm).
3850 if (kvm_create_vm_debugfs(kvm
, r
) < 0) {
3855 kvm_uevent_notify_change(KVM_EVENT_CREATE_VM
, kvm
);
3857 fd_install(r
, file
);
3865 static long kvm_dev_ioctl(struct file
*filp
,
3866 unsigned int ioctl
, unsigned long arg
)
3871 case KVM_GET_API_VERSION
:
3874 r
= KVM_API_VERSION
;
3877 r
= kvm_dev_ioctl_create_vm(arg
);
3879 case KVM_CHECK_EXTENSION
:
3880 r
= kvm_vm_ioctl_check_extension_generic(NULL
, arg
);
3882 case KVM_GET_VCPU_MMAP_SIZE
:
3885 r
= PAGE_SIZE
; /* struct kvm_run */
3887 r
+= PAGE_SIZE
; /* pio data page */
3889 #ifdef CONFIG_KVM_MMIO
3890 r
+= PAGE_SIZE
; /* coalesced mmio ring page */
3893 case KVM_TRACE_ENABLE
:
3894 case KVM_TRACE_PAUSE
:
3895 case KVM_TRACE_DISABLE
:
3899 return kvm_arch_dev_ioctl(filp
, ioctl
, arg
);
3905 static struct file_operations kvm_chardev_ops
= {
3906 .unlocked_ioctl
= kvm_dev_ioctl
,
3907 .llseek
= noop_llseek
,
3908 KVM_COMPAT(kvm_dev_ioctl
),
3911 static struct miscdevice kvm_dev
= {
3917 static void hardware_enable_nolock(void *junk
)
3919 int cpu
= raw_smp_processor_id();
3922 if (cpumask_test_cpu(cpu
, cpus_hardware_enabled
))
3925 cpumask_set_cpu(cpu
, cpus_hardware_enabled
);
3927 r
= kvm_arch_hardware_enable();
3930 cpumask_clear_cpu(cpu
, cpus_hardware_enabled
);
3931 atomic_inc(&hardware_enable_failed
);
3932 pr_info("kvm: enabling virtualization on CPU%d failed\n", cpu
);
3936 static int kvm_starting_cpu(unsigned int cpu
)
3938 raw_spin_lock(&kvm_count_lock
);
3939 if (kvm_usage_count
)
3940 hardware_enable_nolock(NULL
);
3941 raw_spin_unlock(&kvm_count_lock
);
3945 static void hardware_disable_nolock(void *junk
)
3947 int cpu
= raw_smp_processor_id();
3949 if (!cpumask_test_cpu(cpu
, cpus_hardware_enabled
))
3951 cpumask_clear_cpu(cpu
, cpus_hardware_enabled
);
3952 kvm_arch_hardware_disable();
3955 static int kvm_dying_cpu(unsigned int cpu
)
3957 raw_spin_lock(&kvm_count_lock
);
3958 if (kvm_usage_count
)
3959 hardware_disable_nolock(NULL
);
3960 raw_spin_unlock(&kvm_count_lock
);
3964 static void hardware_disable_all_nolock(void)
3966 BUG_ON(!kvm_usage_count
);
3969 if (!kvm_usage_count
)
3970 on_each_cpu(hardware_disable_nolock
, NULL
, 1);
3973 static void hardware_disable_all(void)
3975 raw_spin_lock(&kvm_count_lock
);
3976 hardware_disable_all_nolock();
3977 raw_spin_unlock(&kvm_count_lock
);
3980 static int hardware_enable_all(void)
3984 raw_spin_lock(&kvm_count_lock
);
3987 if (kvm_usage_count
== 1) {
3988 atomic_set(&hardware_enable_failed
, 0);
3989 on_each_cpu(hardware_enable_nolock
, NULL
, 1);
3991 if (atomic_read(&hardware_enable_failed
)) {
3992 hardware_disable_all_nolock();
3997 raw_spin_unlock(&kvm_count_lock
);
4002 static int kvm_reboot(struct notifier_block
*notifier
, unsigned long val
,
4006 * Some (well, at least mine) BIOSes hang on reboot if
4009 * And Intel TXT required VMX off for all cpu when system shutdown.
4011 pr_info("kvm: exiting hardware virtualization\n");
4012 kvm_rebooting
= true;
4013 on_each_cpu(hardware_disable_nolock
, NULL
, 1);
4017 static struct notifier_block kvm_reboot_notifier
= {
4018 .notifier_call
= kvm_reboot
,
4022 static void kvm_io_bus_destroy(struct kvm_io_bus
*bus
)
4026 for (i
= 0; i
< bus
->dev_count
; i
++) {
4027 struct kvm_io_device
*pos
= bus
->range
[i
].dev
;
4029 kvm_iodevice_destructor(pos
);
4034 static inline int kvm_io_bus_cmp(const struct kvm_io_range
*r1
,
4035 const struct kvm_io_range
*r2
)
4037 gpa_t addr1
= r1
->addr
;
4038 gpa_t addr2
= r2
->addr
;
4043 /* If r2->len == 0, match the exact address. If r2->len != 0,
4044 * accept any overlapping write. Any order is acceptable for
4045 * overlapping ranges, because kvm_io_bus_get_first_dev ensures
4046 * we process all of them.
4059 static int kvm_io_bus_sort_cmp(const void *p1
, const void *p2
)
4061 return kvm_io_bus_cmp(p1
, p2
);
4064 static int kvm_io_bus_get_first_dev(struct kvm_io_bus
*bus
,
4065 gpa_t addr
, int len
)
4067 struct kvm_io_range
*range
, key
;
4070 key
= (struct kvm_io_range
) {
4075 range
= bsearch(&key
, bus
->range
, bus
->dev_count
,
4076 sizeof(struct kvm_io_range
), kvm_io_bus_sort_cmp
);
4080 off
= range
- bus
->range
;
4082 while (off
> 0 && kvm_io_bus_cmp(&key
, &bus
->range
[off
-1]) == 0)
4088 static int __kvm_io_bus_write(struct kvm_vcpu
*vcpu
, struct kvm_io_bus
*bus
,
4089 struct kvm_io_range
*range
, const void *val
)
4093 idx
= kvm_io_bus_get_first_dev(bus
, range
->addr
, range
->len
);
4097 while (idx
< bus
->dev_count
&&
4098 kvm_io_bus_cmp(range
, &bus
->range
[idx
]) == 0) {
4099 if (!kvm_iodevice_write(vcpu
, bus
->range
[idx
].dev
, range
->addr
,
4108 /* kvm_io_bus_write - called under kvm->slots_lock */
4109 int kvm_io_bus_write(struct kvm_vcpu
*vcpu
, enum kvm_bus bus_idx
, gpa_t addr
,
4110 int len
, const void *val
)
4112 struct kvm_io_bus
*bus
;
4113 struct kvm_io_range range
;
4116 range
= (struct kvm_io_range
) {
4121 bus
= srcu_dereference(vcpu
->kvm
->buses
[bus_idx
], &vcpu
->kvm
->srcu
);
4124 r
= __kvm_io_bus_write(vcpu
, bus
, &range
, val
);
4125 return r
< 0 ? r
: 0;
4127 EXPORT_SYMBOL_GPL(kvm_io_bus_write
);
4129 /* kvm_io_bus_write_cookie - called under kvm->slots_lock */
4130 int kvm_io_bus_write_cookie(struct kvm_vcpu
*vcpu
, enum kvm_bus bus_idx
,
4131 gpa_t addr
, int len
, const void *val
, long cookie
)
4133 struct kvm_io_bus
*bus
;
4134 struct kvm_io_range range
;
4136 range
= (struct kvm_io_range
) {
4141 bus
= srcu_dereference(vcpu
->kvm
->buses
[bus_idx
], &vcpu
->kvm
->srcu
);
4145 /* First try the device referenced by cookie. */
4146 if ((cookie
>= 0) && (cookie
< bus
->dev_count
) &&
4147 (kvm_io_bus_cmp(&range
, &bus
->range
[cookie
]) == 0))
4148 if (!kvm_iodevice_write(vcpu
, bus
->range
[cookie
].dev
, addr
, len
,
4153 * cookie contained garbage; fall back to search and return the
4154 * correct cookie value.
4156 return __kvm_io_bus_write(vcpu
, bus
, &range
, val
);
4159 static int __kvm_io_bus_read(struct kvm_vcpu
*vcpu
, struct kvm_io_bus
*bus
,
4160 struct kvm_io_range
*range
, void *val
)
4164 idx
= kvm_io_bus_get_first_dev(bus
, range
->addr
, range
->len
);
4168 while (idx
< bus
->dev_count
&&
4169 kvm_io_bus_cmp(range
, &bus
->range
[idx
]) == 0) {
4170 if (!kvm_iodevice_read(vcpu
, bus
->range
[idx
].dev
, range
->addr
,
4179 /* kvm_io_bus_read - called under kvm->slots_lock */
4180 int kvm_io_bus_read(struct kvm_vcpu
*vcpu
, enum kvm_bus bus_idx
, gpa_t addr
,
4183 struct kvm_io_bus
*bus
;
4184 struct kvm_io_range range
;
4187 range
= (struct kvm_io_range
) {
4192 bus
= srcu_dereference(vcpu
->kvm
->buses
[bus_idx
], &vcpu
->kvm
->srcu
);
4195 r
= __kvm_io_bus_read(vcpu
, bus
, &range
, val
);
4196 return r
< 0 ? r
: 0;
4199 /* Caller must hold slots_lock. */
4200 int kvm_io_bus_register_dev(struct kvm
*kvm
, enum kvm_bus bus_idx
, gpa_t addr
,
4201 int len
, struct kvm_io_device
*dev
)
4204 struct kvm_io_bus
*new_bus
, *bus
;
4205 struct kvm_io_range range
;
4207 bus
= kvm_get_bus(kvm
, bus_idx
);
4211 /* exclude ioeventfd which is limited by maximum fd */
4212 if (bus
->dev_count
- bus
->ioeventfd_count
> NR_IOBUS_DEVS
- 1)
4215 new_bus
= kmalloc(struct_size(bus
, range
, bus
->dev_count
+ 1),
4216 GFP_KERNEL_ACCOUNT
);
4220 range
= (struct kvm_io_range
) {
4226 for (i
= 0; i
< bus
->dev_count
; i
++)
4227 if (kvm_io_bus_cmp(&bus
->range
[i
], &range
) > 0)
4230 memcpy(new_bus
, bus
, sizeof(*bus
) + i
* sizeof(struct kvm_io_range
));
4231 new_bus
->dev_count
++;
4232 new_bus
->range
[i
] = range
;
4233 memcpy(new_bus
->range
+ i
+ 1, bus
->range
+ i
,
4234 (bus
->dev_count
- i
) * sizeof(struct kvm_io_range
));
4235 rcu_assign_pointer(kvm
->buses
[bus_idx
], new_bus
);
4236 synchronize_srcu_expedited(&kvm
->srcu
);
4242 /* Caller must hold slots_lock. */
4243 void kvm_io_bus_unregister_dev(struct kvm
*kvm
, enum kvm_bus bus_idx
,
4244 struct kvm_io_device
*dev
)
4247 struct kvm_io_bus
*new_bus
, *bus
;
4249 bus
= kvm_get_bus(kvm
, bus_idx
);
4253 for (i
= 0; i
< bus
->dev_count
; i
++)
4254 if (bus
->range
[i
].dev
== dev
) {
4258 if (i
== bus
->dev_count
)
4261 new_bus
= kmalloc(struct_size(bus
, range
, bus
->dev_count
- 1),
4262 GFP_KERNEL_ACCOUNT
);
4264 pr_err("kvm: failed to shrink bus, removing it completely\n");
4268 memcpy(new_bus
, bus
, sizeof(*bus
) + i
* sizeof(struct kvm_io_range
));
4269 new_bus
->dev_count
--;
4270 memcpy(new_bus
->range
+ i
, bus
->range
+ i
+ 1,
4271 (new_bus
->dev_count
- i
) * sizeof(struct kvm_io_range
));
4274 rcu_assign_pointer(kvm
->buses
[bus_idx
], new_bus
);
4275 synchronize_srcu_expedited(&kvm
->srcu
);
4280 struct kvm_io_device
*kvm_io_bus_get_dev(struct kvm
*kvm
, enum kvm_bus bus_idx
,
4283 struct kvm_io_bus
*bus
;
4284 int dev_idx
, srcu_idx
;
4285 struct kvm_io_device
*iodev
= NULL
;
4287 srcu_idx
= srcu_read_lock(&kvm
->srcu
);
4289 bus
= srcu_dereference(kvm
->buses
[bus_idx
], &kvm
->srcu
);
4293 dev_idx
= kvm_io_bus_get_first_dev(bus
, addr
, 1);
4297 iodev
= bus
->range
[dev_idx
].dev
;
4300 srcu_read_unlock(&kvm
->srcu
, srcu_idx
);
4304 EXPORT_SYMBOL_GPL(kvm_io_bus_get_dev
);
4306 static int kvm_debugfs_open(struct inode
*inode
, struct file
*file
,
4307 int (*get
)(void *, u64
*), int (*set
)(void *, u64
),
4310 struct kvm_stat_data
*stat_data
= (struct kvm_stat_data
*)
4313 /* The debugfs files are a reference to the kvm struct which
4314 * is still valid when kvm_destroy_vm is called.
4315 * To avoid the race between open and the removal of the debugfs
4316 * directory we test against the users count.
4318 if (!refcount_inc_not_zero(&stat_data
->kvm
->users_count
))
4321 if (simple_attr_open(inode
, file
, get
,
4322 KVM_DBGFS_GET_MODE(stat_data
->dbgfs_item
) & 0222
4325 kvm_put_kvm(stat_data
->kvm
);
4332 static int kvm_debugfs_release(struct inode
*inode
, struct file
*file
)
4334 struct kvm_stat_data
*stat_data
= (struct kvm_stat_data
*)
4337 simple_attr_release(inode
, file
);
4338 kvm_put_kvm(stat_data
->kvm
);
4343 static int kvm_get_stat_per_vm(struct kvm
*kvm
, size_t offset
, u64
*val
)
4345 *val
= *(ulong
*)((void *)kvm
+ offset
);
4350 static int kvm_clear_stat_per_vm(struct kvm
*kvm
, size_t offset
)
4352 *(ulong
*)((void *)kvm
+ offset
) = 0;
4357 static int kvm_get_stat_per_vcpu(struct kvm
*kvm
, size_t offset
, u64
*val
)
4360 struct kvm_vcpu
*vcpu
;
4364 kvm_for_each_vcpu(i
, vcpu
, kvm
)
4365 *val
+= *(u64
*)((void *)vcpu
+ offset
);
4370 static int kvm_clear_stat_per_vcpu(struct kvm
*kvm
, size_t offset
)
4373 struct kvm_vcpu
*vcpu
;
4375 kvm_for_each_vcpu(i
, vcpu
, kvm
)
4376 *(u64
*)((void *)vcpu
+ offset
) = 0;
4381 static int kvm_stat_data_get(void *data
, u64
*val
)
4384 struct kvm_stat_data
*stat_data
= (struct kvm_stat_data
*)data
;
4386 switch (stat_data
->dbgfs_item
->kind
) {
4388 r
= kvm_get_stat_per_vm(stat_data
->kvm
,
4389 stat_data
->dbgfs_item
->offset
, val
);
4392 r
= kvm_get_stat_per_vcpu(stat_data
->kvm
,
4393 stat_data
->dbgfs_item
->offset
, val
);
4400 static int kvm_stat_data_clear(void *data
, u64 val
)
4403 struct kvm_stat_data
*stat_data
= (struct kvm_stat_data
*)data
;
4408 switch (stat_data
->dbgfs_item
->kind
) {
4410 r
= kvm_clear_stat_per_vm(stat_data
->kvm
,
4411 stat_data
->dbgfs_item
->offset
);
4414 r
= kvm_clear_stat_per_vcpu(stat_data
->kvm
,
4415 stat_data
->dbgfs_item
->offset
);
4422 static int kvm_stat_data_open(struct inode
*inode
, struct file
*file
)
4424 __simple_attr_check_format("%llu\n", 0ull);
4425 return kvm_debugfs_open(inode
, file
, kvm_stat_data_get
,
4426 kvm_stat_data_clear
, "%llu\n");
4429 static const struct file_operations stat_fops_per_vm
= {
4430 .owner
= THIS_MODULE
,
4431 .open
= kvm_stat_data_open
,
4432 .release
= kvm_debugfs_release
,
4433 .read
= simple_attr_read
,
4434 .write
= simple_attr_write
,
4435 .llseek
= no_llseek
,
4438 static int vm_stat_get(void *_offset
, u64
*val
)
4440 unsigned offset
= (long)_offset
;
4445 mutex_lock(&kvm_lock
);
4446 list_for_each_entry(kvm
, &vm_list
, vm_list
) {
4447 kvm_get_stat_per_vm(kvm
, offset
, &tmp_val
);
4450 mutex_unlock(&kvm_lock
);
4454 static int vm_stat_clear(void *_offset
, u64 val
)
4456 unsigned offset
= (long)_offset
;
4462 mutex_lock(&kvm_lock
);
4463 list_for_each_entry(kvm
, &vm_list
, vm_list
) {
4464 kvm_clear_stat_per_vm(kvm
, offset
);
4466 mutex_unlock(&kvm_lock
);
4471 DEFINE_SIMPLE_ATTRIBUTE(vm_stat_fops
, vm_stat_get
, vm_stat_clear
, "%llu\n");
4473 static int vcpu_stat_get(void *_offset
, u64
*val
)
4475 unsigned offset
= (long)_offset
;
4480 mutex_lock(&kvm_lock
);
4481 list_for_each_entry(kvm
, &vm_list
, vm_list
) {
4482 kvm_get_stat_per_vcpu(kvm
, offset
, &tmp_val
);
4485 mutex_unlock(&kvm_lock
);
4489 static int vcpu_stat_clear(void *_offset
, u64 val
)
4491 unsigned offset
= (long)_offset
;
4497 mutex_lock(&kvm_lock
);
4498 list_for_each_entry(kvm
, &vm_list
, vm_list
) {
4499 kvm_clear_stat_per_vcpu(kvm
, offset
);
4501 mutex_unlock(&kvm_lock
);
4506 DEFINE_SIMPLE_ATTRIBUTE(vcpu_stat_fops
, vcpu_stat_get
, vcpu_stat_clear
,
4509 static const struct file_operations
*stat_fops
[] = {
4510 [KVM_STAT_VCPU
] = &vcpu_stat_fops
,
4511 [KVM_STAT_VM
] = &vm_stat_fops
,
4514 static void kvm_uevent_notify_change(unsigned int type
, struct kvm
*kvm
)
4516 struct kobj_uevent_env
*env
;
4517 unsigned long long created
, active
;
4519 if (!kvm_dev
.this_device
|| !kvm
)
4522 mutex_lock(&kvm_lock
);
4523 if (type
== KVM_EVENT_CREATE_VM
) {
4524 kvm_createvm_count
++;
4526 } else if (type
== KVM_EVENT_DESTROY_VM
) {
4529 created
= kvm_createvm_count
;
4530 active
= kvm_active_vms
;
4531 mutex_unlock(&kvm_lock
);
4533 env
= kzalloc(sizeof(*env
), GFP_KERNEL_ACCOUNT
);
4537 add_uevent_var(env
, "CREATED=%llu", created
);
4538 add_uevent_var(env
, "COUNT=%llu", active
);
4540 if (type
== KVM_EVENT_CREATE_VM
) {
4541 add_uevent_var(env
, "EVENT=create");
4542 kvm
->userspace_pid
= task_pid_nr(current
);
4543 } else if (type
== KVM_EVENT_DESTROY_VM
) {
4544 add_uevent_var(env
, "EVENT=destroy");
4546 add_uevent_var(env
, "PID=%d", kvm
->userspace_pid
);
4548 if (!IS_ERR_OR_NULL(kvm
->debugfs_dentry
)) {
4549 char *tmp
, *p
= kmalloc(PATH_MAX
, GFP_KERNEL_ACCOUNT
);
4552 tmp
= dentry_path_raw(kvm
->debugfs_dentry
, p
, PATH_MAX
);
4554 add_uevent_var(env
, "STATS_PATH=%s", tmp
);
4558 /* no need for checks, since we are adding at most only 5 keys */
4559 env
->envp
[env
->envp_idx
++] = NULL
;
4560 kobject_uevent_env(&kvm_dev
.this_device
->kobj
, KOBJ_CHANGE
, env
->envp
);
4564 static void kvm_init_debug(void)
4566 struct kvm_stats_debugfs_item
*p
;
4568 kvm_debugfs_dir
= debugfs_create_dir("kvm", NULL
);
4570 kvm_debugfs_num_entries
= 0;
4571 for (p
= debugfs_entries
; p
->name
; ++p
, kvm_debugfs_num_entries
++) {
4572 debugfs_create_file(p
->name
, KVM_DBGFS_GET_MODE(p
),
4573 kvm_debugfs_dir
, (void *)(long)p
->offset
,
4574 stat_fops
[p
->kind
]);
4578 static int kvm_suspend(void)
4580 if (kvm_usage_count
)
4581 hardware_disable_nolock(NULL
);
4585 static void kvm_resume(void)
4587 if (kvm_usage_count
) {
4588 #ifdef CONFIG_LOCKDEP
4589 WARN_ON(lockdep_is_held(&kvm_count_lock
));
4591 hardware_enable_nolock(NULL
);
4595 static struct syscore_ops kvm_syscore_ops
= {
4596 .suspend
= kvm_suspend
,
4597 .resume
= kvm_resume
,
4601 struct kvm_vcpu
*preempt_notifier_to_vcpu(struct preempt_notifier
*pn
)
4603 return container_of(pn
, struct kvm_vcpu
, preempt_notifier
);
4606 static void kvm_sched_in(struct preempt_notifier
*pn
, int cpu
)
4608 struct kvm_vcpu
*vcpu
= preempt_notifier_to_vcpu(pn
);
4610 WRITE_ONCE(vcpu
->preempted
, false);
4611 WRITE_ONCE(vcpu
->ready
, false);
4613 __this_cpu_write(kvm_running_vcpu
, vcpu
);
4614 kvm_arch_sched_in(vcpu
, cpu
);
4615 kvm_arch_vcpu_load(vcpu
, cpu
);
4618 static void kvm_sched_out(struct preempt_notifier
*pn
,
4619 struct task_struct
*next
)
4621 struct kvm_vcpu
*vcpu
= preempt_notifier_to_vcpu(pn
);
4623 if (current
->state
== TASK_RUNNING
) {
4624 WRITE_ONCE(vcpu
->preempted
, true);
4625 WRITE_ONCE(vcpu
->ready
, true);
4627 kvm_arch_vcpu_put(vcpu
);
4628 __this_cpu_write(kvm_running_vcpu
, NULL
);
4632 * kvm_get_running_vcpu - get the vcpu running on the current CPU.
4634 * We can disable preemption locally around accessing the per-CPU variable,
4635 * and use the resolved vcpu pointer after enabling preemption again,
4636 * because even if the current thread is migrated to another CPU, reading
4637 * the per-CPU value later will give us the same value as we update the
4638 * per-CPU variable in the preempt notifier handlers.
4640 struct kvm_vcpu
*kvm_get_running_vcpu(void)
4642 struct kvm_vcpu
*vcpu
;
4645 vcpu
= __this_cpu_read(kvm_running_vcpu
);
4652 * kvm_get_running_vcpus - get the per-CPU array of currently running vcpus.
4654 struct kvm_vcpu
* __percpu
*kvm_get_running_vcpus(void)
4656 return &kvm_running_vcpu
;
4659 struct kvm_cpu_compat_check
{
4664 static void check_processor_compat(void *data
)
4666 struct kvm_cpu_compat_check
*c
= data
;
4668 *c
->ret
= kvm_arch_check_processor_compat(c
->opaque
);
4671 int kvm_init(void *opaque
, unsigned vcpu_size
, unsigned vcpu_align
,
4672 struct module
*module
)
4674 struct kvm_cpu_compat_check c
;
4678 r
= kvm_arch_init(opaque
);
4683 * kvm_arch_init makes sure there's at most one caller
4684 * for architectures that support multiple implementations,
4685 * like intel and amd on x86.
4686 * kvm_arch_init must be called before kvm_irqfd_init to avoid creating
4687 * conflicts in case kvm is already setup for another implementation.
4689 r
= kvm_irqfd_init();
4693 if (!zalloc_cpumask_var(&cpus_hardware_enabled
, GFP_KERNEL
)) {
4698 r
= kvm_arch_hardware_setup(opaque
);
4704 for_each_online_cpu(cpu
) {
4705 smp_call_function_single(cpu
, check_processor_compat
, &c
, 1);
4710 r
= cpuhp_setup_state_nocalls(CPUHP_AP_KVM_STARTING
, "kvm/cpu:starting",
4711 kvm_starting_cpu
, kvm_dying_cpu
);
4714 register_reboot_notifier(&kvm_reboot_notifier
);
4716 /* A kmem cache lets us meet the alignment requirements of fx_save. */
4718 vcpu_align
= __alignof__(struct kvm_vcpu
);
4720 kmem_cache_create_usercopy("kvm_vcpu", vcpu_size
, vcpu_align
,
4722 offsetof(struct kvm_vcpu
, arch
),
4723 sizeof_field(struct kvm_vcpu
, arch
),
4725 if (!kvm_vcpu_cache
) {
4730 r
= kvm_async_pf_init();
4734 kvm_chardev_ops
.owner
= module
;
4735 kvm_vm_fops
.owner
= module
;
4736 kvm_vcpu_fops
.owner
= module
;
4738 r
= misc_register(&kvm_dev
);
4740 pr_err("kvm: misc device register failed\n");
4744 register_syscore_ops(&kvm_syscore_ops
);
4746 kvm_preempt_ops
.sched_in
= kvm_sched_in
;
4747 kvm_preempt_ops
.sched_out
= kvm_sched_out
;
4751 r
= kvm_vfio_ops_init();
4757 kvm_async_pf_deinit();
4759 kmem_cache_destroy(kvm_vcpu_cache
);
4761 unregister_reboot_notifier(&kvm_reboot_notifier
);
4762 cpuhp_remove_state_nocalls(CPUHP_AP_KVM_STARTING
);
4764 kvm_arch_hardware_unsetup();
4766 free_cpumask_var(cpus_hardware_enabled
);
4774 EXPORT_SYMBOL_GPL(kvm_init
);
4778 debugfs_remove_recursive(kvm_debugfs_dir
);
4779 misc_deregister(&kvm_dev
);
4780 kmem_cache_destroy(kvm_vcpu_cache
);
4781 kvm_async_pf_deinit();
4782 unregister_syscore_ops(&kvm_syscore_ops
);
4783 unregister_reboot_notifier(&kvm_reboot_notifier
);
4784 cpuhp_remove_state_nocalls(CPUHP_AP_KVM_STARTING
);
4785 on_each_cpu(hardware_disable_nolock
, NULL
, 1);
4786 kvm_arch_hardware_unsetup();
4789 free_cpumask_var(cpus_hardware_enabled
);
4790 kvm_vfio_ops_exit();
4792 EXPORT_SYMBOL_GPL(kvm_exit
);
4794 struct kvm_vm_worker_thread_context
{
4796 struct task_struct
*parent
;
4797 struct completion init_done
;
4798 kvm_vm_thread_fn_t thread_fn
;
4803 static int kvm_vm_worker_thread(void *context
)
4806 * The init_context is allocated on the stack of the parent thread, so
4807 * we have to locally copy anything that is needed beyond initialization
4809 struct kvm_vm_worker_thread_context
*init_context
= context
;
4810 struct kvm
*kvm
= init_context
->kvm
;
4811 kvm_vm_thread_fn_t thread_fn
= init_context
->thread_fn
;
4812 uintptr_t data
= init_context
->data
;
4815 err
= kthread_park(current
);
4816 /* kthread_park(current) is never supposed to return an error */
4821 err
= cgroup_attach_task_all(init_context
->parent
, current
);
4823 kvm_err("%s: cgroup_attach_task_all failed with err %d\n",
4828 set_user_nice(current
, task_nice(init_context
->parent
));
4831 init_context
->err
= err
;
4832 complete(&init_context
->init_done
);
4833 init_context
= NULL
;
4838 /* Wait to be woken up by the spawner before proceeding. */
4841 if (!kthread_should_stop())
4842 err
= thread_fn(kvm
, data
);
4847 int kvm_vm_create_worker_thread(struct kvm
*kvm
, kvm_vm_thread_fn_t thread_fn
,
4848 uintptr_t data
, const char *name
,
4849 struct task_struct
**thread_ptr
)
4851 struct kvm_vm_worker_thread_context init_context
= {};
4852 struct task_struct
*thread
;
4855 init_context
.kvm
= kvm
;
4856 init_context
.parent
= current
;
4857 init_context
.thread_fn
= thread_fn
;
4858 init_context
.data
= data
;
4859 init_completion(&init_context
.init_done
);
4861 thread
= kthread_run(kvm_vm_worker_thread
, &init_context
,
4862 "%s-%d", name
, task_pid_nr(current
));
4864 return PTR_ERR(thread
);
4866 /* kthread_run is never supposed to return NULL */
4867 WARN_ON(thread
== NULL
);
4869 wait_for_completion(&init_context
.init_done
);
4871 if (!init_context
.err
)
4872 *thread_ptr
= thread
;
4874 return init_context
.err
;