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>
59 #include "coalesced_mmio.h"
63 #define CREATE_TRACE_POINTS
64 #include <trace/events/kvm.h>
66 /* Worst case buffer size needed for holding an integer. */
67 #define ITOA_MAX_LEN 12
69 MODULE_AUTHOR("Qumranet");
70 MODULE_LICENSE("GPL");
72 /* Architectures should define their poll value according to the halt latency */
73 unsigned int halt_poll_ns
= KVM_HALT_POLL_NS_DEFAULT
;
74 module_param(halt_poll_ns
, uint
, 0644);
75 EXPORT_SYMBOL_GPL(halt_poll_ns
);
77 /* Default doubles per-vcpu halt_poll_ns. */
78 unsigned int halt_poll_ns_grow
= 2;
79 module_param(halt_poll_ns_grow
, uint
, 0644);
80 EXPORT_SYMBOL_GPL(halt_poll_ns_grow
);
82 /* The start value to grow halt_poll_ns from */
83 unsigned int halt_poll_ns_grow_start
= 10000; /* 10us */
84 module_param(halt_poll_ns_grow_start
, uint
, 0644);
85 EXPORT_SYMBOL_GPL(halt_poll_ns_grow_start
);
87 /* Default resets per-vcpu halt_poll_ns . */
88 unsigned int halt_poll_ns_shrink
;
89 module_param(halt_poll_ns_shrink
, uint
, 0644);
90 EXPORT_SYMBOL_GPL(halt_poll_ns_shrink
);
95 * kvm->lock --> kvm->slots_lock --> kvm->irq_lock
98 DEFINE_MUTEX(kvm_lock
);
99 static DEFINE_RAW_SPINLOCK(kvm_count_lock
);
102 static cpumask_var_t cpus_hardware_enabled
;
103 static int kvm_usage_count
;
104 static atomic_t hardware_enable_failed
;
106 static struct kmem_cache
*kvm_vcpu_cache
;
108 static __read_mostly
struct preempt_ops kvm_preempt_ops
;
109 static DEFINE_PER_CPU(struct kvm_vcpu
*, kvm_running_vcpu
);
111 struct dentry
*kvm_debugfs_dir
;
112 EXPORT_SYMBOL_GPL(kvm_debugfs_dir
);
114 static int kvm_debugfs_num_entries
;
115 static const struct file_operations stat_fops_per_vm
;
117 static long kvm_vcpu_ioctl(struct file
*file
, unsigned int ioctl
,
119 #ifdef CONFIG_KVM_COMPAT
120 static long kvm_vcpu_compat_ioctl(struct file
*file
, unsigned int ioctl
,
122 #define KVM_COMPAT(c) .compat_ioctl = (c)
125 * For architectures that don't implement a compat infrastructure,
126 * adopt a double line of defense:
127 * - Prevent a compat task from opening /dev/kvm
128 * - If the open has been done by a 64bit task, and the KVM fd
129 * passed to a compat task, let the ioctls fail.
131 static long kvm_no_compat_ioctl(struct file
*file
, unsigned int ioctl
,
132 unsigned long arg
) { return -EINVAL
; }
134 static int kvm_no_compat_open(struct inode
*inode
, struct file
*file
)
136 return is_compat_task() ? -ENODEV
: 0;
138 #define KVM_COMPAT(c) .compat_ioctl = kvm_no_compat_ioctl, \
139 .open = kvm_no_compat_open
141 static int hardware_enable_all(void);
142 static void hardware_disable_all(void);
144 static void kvm_io_bus_destroy(struct kvm_io_bus
*bus
);
146 static void mark_page_dirty_in_slot(struct kvm_memory_slot
*memslot
, gfn_t gfn
);
148 __visible
bool kvm_rebooting
;
149 EXPORT_SYMBOL_GPL(kvm_rebooting
);
151 #define KVM_EVENT_CREATE_VM 0
152 #define KVM_EVENT_DESTROY_VM 1
153 static void kvm_uevent_notify_change(unsigned int type
, struct kvm
*kvm
);
154 static unsigned long long kvm_createvm_count
;
155 static unsigned long long kvm_active_vms
;
157 __weak
int kvm_arch_mmu_notifier_invalidate_range(struct kvm
*kvm
,
158 unsigned long start
, unsigned long end
, bool blockable
)
163 bool kvm_is_zone_device_pfn(kvm_pfn_t pfn
)
166 * The metadata used by is_zone_device_page() to determine whether or
167 * not a page is ZONE_DEVICE is guaranteed to be valid if and only if
168 * the device has been pinned, e.g. by get_user_pages(). WARN if the
169 * page_count() is zero to help detect bad usage of this helper.
171 if (!pfn_valid(pfn
) || WARN_ON_ONCE(!page_count(pfn_to_page(pfn
))))
174 return is_zone_device_page(pfn_to_page(pfn
));
177 bool kvm_is_reserved_pfn(kvm_pfn_t pfn
)
180 * ZONE_DEVICE pages currently set PG_reserved, but from a refcounting
181 * perspective they are "normal" pages, albeit with slightly different
185 return PageReserved(pfn_to_page(pfn
)) &&
187 !kvm_is_zone_device_pfn(pfn
);
192 bool kvm_is_transparent_hugepage(kvm_pfn_t pfn
)
194 struct page
*page
= pfn_to_page(pfn
);
196 if (!PageTransCompoundMap(page
))
199 return is_transparent_hugepage(compound_head(page
));
203 * Switches to specified vcpu, until a matching vcpu_put()
205 void vcpu_load(struct kvm_vcpu
*vcpu
)
209 __this_cpu_write(kvm_running_vcpu
, vcpu
);
210 preempt_notifier_register(&vcpu
->preempt_notifier
);
211 kvm_arch_vcpu_load(vcpu
, cpu
);
214 EXPORT_SYMBOL_GPL(vcpu_load
);
216 void vcpu_put(struct kvm_vcpu
*vcpu
)
219 kvm_arch_vcpu_put(vcpu
);
220 preempt_notifier_unregister(&vcpu
->preempt_notifier
);
221 __this_cpu_write(kvm_running_vcpu
, NULL
);
224 EXPORT_SYMBOL_GPL(vcpu_put
);
226 /* TODO: merge with kvm_arch_vcpu_should_kick */
227 static bool kvm_request_needs_ipi(struct kvm_vcpu
*vcpu
, unsigned req
)
229 int mode
= kvm_vcpu_exiting_guest_mode(vcpu
);
232 * We need to wait for the VCPU to reenable interrupts and get out of
233 * READING_SHADOW_PAGE_TABLES mode.
235 if (req
& KVM_REQUEST_WAIT
)
236 return mode
!= OUTSIDE_GUEST_MODE
;
239 * Need to kick a running VCPU, but otherwise there is nothing to do.
241 return mode
== IN_GUEST_MODE
;
244 static void ack_flush(void *_completed
)
248 static inline bool kvm_kick_many_cpus(const struct cpumask
*cpus
, bool wait
)
251 cpus
= cpu_online_mask
;
253 if (cpumask_empty(cpus
))
256 smp_call_function_many(cpus
, ack_flush
, NULL
, wait
);
260 bool kvm_make_vcpus_request_mask(struct kvm
*kvm
, unsigned int req
,
261 struct kvm_vcpu
*except
,
262 unsigned long *vcpu_bitmap
, cpumask_var_t tmp
)
265 struct kvm_vcpu
*vcpu
;
270 kvm_for_each_vcpu(i
, vcpu
, kvm
) {
271 if ((vcpu_bitmap
&& !test_bit(i
, vcpu_bitmap
)) ||
275 kvm_make_request(req
, vcpu
);
278 if (!(req
& KVM_REQUEST_NO_WAKEUP
) && kvm_vcpu_wake_up(vcpu
))
281 if (tmp
!= NULL
&& cpu
!= -1 && cpu
!= me
&&
282 kvm_request_needs_ipi(vcpu
, req
))
283 __cpumask_set_cpu(cpu
, tmp
);
286 called
= kvm_kick_many_cpus(tmp
, !!(req
& KVM_REQUEST_WAIT
));
292 bool kvm_make_all_cpus_request_except(struct kvm
*kvm
, unsigned int req
,
293 struct kvm_vcpu
*except
)
298 zalloc_cpumask_var(&cpus
, GFP_ATOMIC
);
300 called
= kvm_make_vcpus_request_mask(kvm
, req
, except
, NULL
, cpus
);
302 free_cpumask_var(cpus
);
306 bool kvm_make_all_cpus_request(struct kvm
*kvm
, unsigned int req
)
308 return kvm_make_all_cpus_request_except(kvm
, req
, NULL
);
311 #ifndef CONFIG_HAVE_KVM_ARCH_TLB_FLUSH_ALL
312 void kvm_flush_remote_tlbs(struct kvm
*kvm
)
315 * Read tlbs_dirty before setting KVM_REQ_TLB_FLUSH in
316 * kvm_make_all_cpus_request.
318 long dirty_count
= smp_load_acquire(&kvm
->tlbs_dirty
);
321 * We want to publish modifications to the page tables before reading
322 * mode. Pairs with a memory barrier in arch-specific code.
323 * - x86: smp_mb__after_srcu_read_unlock in vcpu_enter_guest
324 * and smp_mb in walk_shadow_page_lockless_begin/end.
325 * - powerpc: smp_mb in kvmppc_prepare_to_enter.
327 * There is already an smp_mb__after_atomic() before
328 * kvm_make_all_cpus_request() reads vcpu->mode. We reuse that
331 if (!kvm_arch_flush_remote_tlb(kvm
)
332 || kvm_make_all_cpus_request(kvm
, KVM_REQ_TLB_FLUSH
))
333 ++kvm
->stat
.remote_tlb_flush
;
334 cmpxchg(&kvm
->tlbs_dirty
, dirty_count
, 0);
336 EXPORT_SYMBOL_GPL(kvm_flush_remote_tlbs
);
339 void kvm_reload_remote_mmus(struct kvm
*kvm
)
341 kvm_make_all_cpus_request(kvm
, KVM_REQ_MMU_RELOAD
);
344 static void kvm_vcpu_init(struct kvm_vcpu
*vcpu
, struct kvm
*kvm
, unsigned id
)
346 mutex_init(&vcpu
->mutex
);
351 rcuwait_init(&vcpu
->wait
);
352 kvm_async_pf_vcpu_init(vcpu
);
355 INIT_LIST_HEAD(&vcpu
->blocked_vcpu_list
);
357 kvm_vcpu_set_in_spin_loop(vcpu
, false);
358 kvm_vcpu_set_dy_eligible(vcpu
, false);
359 vcpu
->preempted
= false;
361 preempt_notifier_init(&vcpu
->preempt_notifier
, &kvm_preempt_ops
);
364 void kvm_vcpu_destroy(struct kvm_vcpu
*vcpu
)
366 kvm_arch_vcpu_destroy(vcpu
);
369 * No need for rcu_read_lock as VCPU_RUN is the only place that changes
370 * the vcpu->pid pointer, and at destruction time all file descriptors
373 put_pid(rcu_dereference_protected(vcpu
->pid
, 1));
375 free_page((unsigned long)vcpu
->run
);
376 kmem_cache_free(kvm_vcpu_cache
, vcpu
);
378 EXPORT_SYMBOL_GPL(kvm_vcpu_destroy
);
380 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
381 static inline struct kvm
*mmu_notifier_to_kvm(struct mmu_notifier
*mn
)
383 return container_of(mn
, struct kvm
, mmu_notifier
);
386 static void kvm_mmu_notifier_change_pte(struct mmu_notifier
*mn
,
387 struct mm_struct
*mm
,
388 unsigned long address
,
391 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
394 idx
= srcu_read_lock(&kvm
->srcu
);
395 spin_lock(&kvm
->mmu_lock
);
396 kvm
->mmu_notifier_seq
++;
398 if (kvm_set_spte_hva(kvm
, address
, pte
))
399 kvm_flush_remote_tlbs(kvm
);
401 spin_unlock(&kvm
->mmu_lock
);
402 srcu_read_unlock(&kvm
->srcu
, idx
);
405 static int kvm_mmu_notifier_invalidate_range_start(struct mmu_notifier
*mn
,
406 const struct mmu_notifier_range
*range
)
408 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
409 int need_tlb_flush
= 0, idx
;
412 idx
= srcu_read_lock(&kvm
->srcu
);
413 spin_lock(&kvm
->mmu_lock
);
415 * The count increase must become visible at unlock time as no
416 * spte can be established without taking the mmu_lock and
417 * count is also read inside the mmu_lock critical section.
419 kvm
->mmu_notifier_count
++;
420 need_tlb_flush
= kvm_unmap_hva_range(kvm
, range
->start
, range
->end
);
421 need_tlb_flush
|= kvm
->tlbs_dirty
;
422 /* we've to flush the tlb before the pages can be freed */
424 kvm_flush_remote_tlbs(kvm
);
426 spin_unlock(&kvm
->mmu_lock
);
428 ret
= kvm_arch_mmu_notifier_invalidate_range(kvm
, range
->start
,
430 mmu_notifier_range_blockable(range
));
432 srcu_read_unlock(&kvm
->srcu
, idx
);
437 static void kvm_mmu_notifier_invalidate_range_end(struct mmu_notifier
*mn
,
438 const struct mmu_notifier_range
*range
)
440 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
442 spin_lock(&kvm
->mmu_lock
);
444 * This sequence increase will notify the kvm page fault that
445 * the page that is going to be mapped in the spte could have
448 kvm
->mmu_notifier_seq
++;
451 * The above sequence increase must be visible before the
452 * below count decrease, which is ensured by the smp_wmb above
453 * in conjunction with the smp_rmb in mmu_notifier_retry().
455 kvm
->mmu_notifier_count
--;
456 spin_unlock(&kvm
->mmu_lock
);
458 BUG_ON(kvm
->mmu_notifier_count
< 0);
461 static int kvm_mmu_notifier_clear_flush_young(struct mmu_notifier
*mn
,
462 struct mm_struct
*mm
,
466 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
469 idx
= srcu_read_lock(&kvm
->srcu
);
470 spin_lock(&kvm
->mmu_lock
);
472 young
= kvm_age_hva(kvm
, start
, end
);
474 kvm_flush_remote_tlbs(kvm
);
476 spin_unlock(&kvm
->mmu_lock
);
477 srcu_read_unlock(&kvm
->srcu
, idx
);
482 static int kvm_mmu_notifier_clear_young(struct mmu_notifier
*mn
,
483 struct mm_struct
*mm
,
487 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
490 idx
= srcu_read_lock(&kvm
->srcu
);
491 spin_lock(&kvm
->mmu_lock
);
493 * Even though we do not flush TLB, this will still adversely
494 * affect performance on pre-Haswell Intel EPT, where there is
495 * no EPT Access Bit to clear so that we have to tear down EPT
496 * tables instead. If we find this unacceptable, we can always
497 * add a parameter to kvm_age_hva so that it effectively doesn't
498 * do anything on clear_young.
500 * Also note that currently we never issue secondary TLB flushes
501 * from clear_young, leaving this job up to the regular system
502 * cadence. If we find this inaccurate, we might come up with a
503 * more sophisticated heuristic later.
505 young
= kvm_age_hva(kvm
, start
, end
);
506 spin_unlock(&kvm
->mmu_lock
);
507 srcu_read_unlock(&kvm
->srcu
, idx
);
512 static int kvm_mmu_notifier_test_young(struct mmu_notifier
*mn
,
513 struct mm_struct
*mm
,
514 unsigned long address
)
516 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
519 idx
= srcu_read_lock(&kvm
->srcu
);
520 spin_lock(&kvm
->mmu_lock
);
521 young
= kvm_test_age_hva(kvm
, address
);
522 spin_unlock(&kvm
->mmu_lock
);
523 srcu_read_unlock(&kvm
->srcu
, idx
);
528 static void kvm_mmu_notifier_release(struct mmu_notifier
*mn
,
529 struct mm_struct
*mm
)
531 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
534 idx
= srcu_read_lock(&kvm
->srcu
);
535 kvm_arch_flush_shadow_all(kvm
);
536 srcu_read_unlock(&kvm
->srcu
, idx
);
539 static const struct mmu_notifier_ops kvm_mmu_notifier_ops
= {
540 .invalidate_range_start
= kvm_mmu_notifier_invalidate_range_start
,
541 .invalidate_range_end
= kvm_mmu_notifier_invalidate_range_end
,
542 .clear_flush_young
= kvm_mmu_notifier_clear_flush_young
,
543 .clear_young
= kvm_mmu_notifier_clear_young
,
544 .test_young
= kvm_mmu_notifier_test_young
,
545 .change_pte
= kvm_mmu_notifier_change_pte
,
546 .release
= kvm_mmu_notifier_release
,
549 static int kvm_init_mmu_notifier(struct kvm
*kvm
)
551 kvm
->mmu_notifier
.ops
= &kvm_mmu_notifier_ops
;
552 return mmu_notifier_register(&kvm
->mmu_notifier
, current
->mm
);
555 #else /* !(CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER) */
557 static int kvm_init_mmu_notifier(struct kvm
*kvm
)
562 #endif /* CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER */
564 static struct kvm_memslots
*kvm_alloc_memslots(void)
567 struct kvm_memslots
*slots
;
569 slots
= kvzalloc(sizeof(struct kvm_memslots
), GFP_KERNEL_ACCOUNT
);
573 for (i
= 0; i
< KVM_MEM_SLOTS_NUM
; i
++)
574 slots
->id_to_index
[i
] = -1;
579 static void kvm_destroy_dirty_bitmap(struct kvm_memory_slot
*memslot
)
581 if (!memslot
->dirty_bitmap
)
584 kvfree(memslot
->dirty_bitmap
);
585 memslot
->dirty_bitmap
= NULL
;
588 static void kvm_free_memslot(struct kvm
*kvm
, struct kvm_memory_slot
*slot
)
590 kvm_destroy_dirty_bitmap(slot
);
592 kvm_arch_free_memslot(kvm
, slot
);
598 static void kvm_free_memslots(struct kvm
*kvm
, struct kvm_memslots
*slots
)
600 struct kvm_memory_slot
*memslot
;
605 kvm_for_each_memslot(memslot
, slots
)
606 kvm_free_memslot(kvm
, memslot
);
611 static void kvm_destroy_vm_debugfs(struct kvm
*kvm
)
615 if (!kvm
->debugfs_dentry
)
618 debugfs_remove_recursive(kvm
->debugfs_dentry
);
620 if (kvm
->debugfs_stat_data
) {
621 for (i
= 0; i
< kvm_debugfs_num_entries
; i
++)
622 kfree(kvm
->debugfs_stat_data
[i
]);
623 kfree(kvm
->debugfs_stat_data
);
627 static int kvm_create_vm_debugfs(struct kvm
*kvm
, int fd
)
629 char dir_name
[ITOA_MAX_LEN
* 2];
630 struct kvm_stat_data
*stat_data
;
631 struct kvm_stats_debugfs_item
*p
;
633 if (!debugfs_initialized())
636 snprintf(dir_name
, sizeof(dir_name
), "%d-%d", task_pid_nr(current
), fd
);
637 kvm
->debugfs_dentry
= debugfs_create_dir(dir_name
, kvm_debugfs_dir
);
639 kvm
->debugfs_stat_data
= kcalloc(kvm_debugfs_num_entries
,
640 sizeof(*kvm
->debugfs_stat_data
),
642 if (!kvm
->debugfs_stat_data
)
645 for (p
= debugfs_entries
; p
->name
; p
++) {
646 stat_data
= kzalloc(sizeof(*stat_data
), GFP_KERNEL_ACCOUNT
);
650 stat_data
->kvm
= kvm
;
651 stat_data
->dbgfs_item
= p
;
652 kvm
->debugfs_stat_data
[p
- debugfs_entries
] = stat_data
;
653 debugfs_create_file(p
->name
, KVM_DBGFS_GET_MODE(p
),
654 kvm
->debugfs_dentry
, stat_data
,
661 * Called after the VM is otherwise initialized, but just before adding it to
664 int __weak
kvm_arch_post_init_vm(struct kvm
*kvm
)
670 * Called just after removing the VM from the vm_list, but before doing any
673 void __weak
kvm_arch_pre_destroy_vm(struct kvm
*kvm
)
677 static struct kvm
*kvm_create_vm(unsigned long type
)
679 struct kvm
*kvm
= kvm_arch_alloc_vm();
684 return ERR_PTR(-ENOMEM
);
686 spin_lock_init(&kvm
->mmu_lock
);
688 kvm
->mm
= current
->mm
;
689 kvm_eventfd_init(kvm
);
690 mutex_init(&kvm
->lock
);
691 mutex_init(&kvm
->irq_lock
);
692 mutex_init(&kvm
->slots_lock
);
693 INIT_LIST_HEAD(&kvm
->devices
);
695 BUILD_BUG_ON(KVM_MEM_SLOTS_NUM
> SHRT_MAX
);
697 if (init_srcu_struct(&kvm
->srcu
))
698 goto out_err_no_srcu
;
699 if (init_srcu_struct(&kvm
->irq_srcu
))
700 goto out_err_no_irq_srcu
;
702 refcount_set(&kvm
->users_count
, 1);
703 for (i
= 0; i
< KVM_ADDRESS_SPACE_NUM
; i
++) {
704 struct kvm_memslots
*slots
= kvm_alloc_memslots();
707 goto out_err_no_arch_destroy_vm
;
708 /* Generations must be different for each address space. */
709 slots
->generation
= i
;
710 rcu_assign_pointer(kvm
->memslots
[i
], slots
);
713 for (i
= 0; i
< KVM_NR_BUSES
; i
++) {
714 rcu_assign_pointer(kvm
->buses
[i
],
715 kzalloc(sizeof(struct kvm_io_bus
), GFP_KERNEL_ACCOUNT
));
717 goto out_err_no_arch_destroy_vm
;
720 kvm
->max_halt_poll_ns
= halt_poll_ns
;
722 r
= kvm_arch_init_vm(kvm
, type
);
724 goto out_err_no_arch_destroy_vm
;
726 r
= hardware_enable_all();
728 goto out_err_no_disable
;
730 #ifdef CONFIG_HAVE_KVM_IRQFD
731 INIT_HLIST_HEAD(&kvm
->irq_ack_notifier_list
);
734 r
= kvm_init_mmu_notifier(kvm
);
736 goto out_err_no_mmu_notifier
;
738 r
= kvm_arch_post_init_vm(kvm
);
742 mutex_lock(&kvm_lock
);
743 list_add(&kvm
->vm_list
, &vm_list
);
744 mutex_unlock(&kvm_lock
);
746 preempt_notifier_inc();
751 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
752 if (kvm
->mmu_notifier
.ops
)
753 mmu_notifier_unregister(&kvm
->mmu_notifier
, current
->mm
);
755 out_err_no_mmu_notifier
:
756 hardware_disable_all();
758 kvm_arch_destroy_vm(kvm
);
759 out_err_no_arch_destroy_vm
:
760 WARN_ON_ONCE(!refcount_dec_and_test(&kvm
->users_count
));
761 for (i
= 0; i
< KVM_NR_BUSES
; i
++)
762 kfree(kvm_get_bus(kvm
, i
));
763 for (i
= 0; i
< KVM_ADDRESS_SPACE_NUM
; i
++)
764 kvm_free_memslots(kvm
, __kvm_memslots(kvm
, i
));
765 cleanup_srcu_struct(&kvm
->irq_srcu
);
767 cleanup_srcu_struct(&kvm
->srcu
);
769 kvm_arch_free_vm(kvm
);
774 static void kvm_destroy_devices(struct kvm
*kvm
)
776 struct kvm_device
*dev
, *tmp
;
779 * We do not need to take the kvm->lock here, because nobody else
780 * has a reference to the struct kvm at this point and therefore
781 * cannot access the devices list anyhow.
783 list_for_each_entry_safe(dev
, tmp
, &kvm
->devices
, vm_node
) {
784 list_del(&dev
->vm_node
);
785 dev
->ops
->destroy(dev
);
789 static void kvm_destroy_vm(struct kvm
*kvm
)
792 struct mm_struct
*mm
= kvm
->mm
;
794 kvm_uevent_notify_change(KVM_EVENT_DESTROY_VM
, kvm
);
795 kvm_destroy_vm_debugfs(kvm
);
796 kvm_arch_sync_events(kvm
);
797 mutex_lock(&kvm_lock
);
798 list_del(&kvm
->vm_list
);
799 mutex_unlock(&kvm_lock
);
800 kvm_arch_pre_destroy_vm(kvm
);
802 kvm_free_irq_routing(kvm
);
803 for (i
= 0; i
< KVM_NR_BUSES
; i
++) {
804 struct kvm_io_bus
*bus
= kvm_get_bus(kvm
, i
);
807 kvm_io_bus_destroy(bus
);
808 kvm
->buses
[i
] = NULL
;
810 kvm_coalesced_mmio_free(kvm
);
811 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
812 mmu_notifier_unregister(&kvm
->mmu_notifier
, kvm
->mm
);
814 kvm_arch_flush_shadow_all(kvm
);
816 kvm_arch_destroy_vm(kvm
);
817 kvm_destroy_devices(kvm
);
818 for (i
= 0; i
< KVM_ADDRESS_SPACE_NUM
; i
++)
819 kvm_free_memslots(kvm
, __kvm_memslots(kvm
, i
));
820 cleanup_srcu_struct(&kvm
->irq_srcu
);
821 cleanup_srcu_struct(&kvm
->srcu
);
822 kvm_arch_free_vm(kvm
);
823 preempt_notifier_dec();
824 hardware_disable_all();
828 void kvm_get_kvm(struct kvm
*kvm
)
830 refcount_inc(&kvm
->users_count
);
832 EXPORT_SYMBOL_GPL(kvm_get_kvm
);
834 void kvm_put_kvm(struct kvm
*kvm
)
836 if (refcount_dec_and_test(&kvm
->users_count
))
839 EXPORT_SYMBOL_GPL(kvm_put_kvm
);
842 * Used to put a reference that was taken on behalf of an object associated
843 * with a user-visible file descriptor, e.g. a vcpu or device, if installation
844 * of the new file descriptor fails and the reference cannot be transferred to
845 * its final owner. In such cases, the caller is still actively using @kvm and
846 * will fail miserably if the refcount unexpectedly hits zero.
848 void kvm_put_kvm_no_destroy(struct kvm
*kvm
)
850 WARN_ON(refcount_dec_and_test(&kvm
->users_count
));
852 EXPORT_SYMBOL_GPL(kvm_put_kvm_no_destroy
);
854 static int kvm_vm_release(struct inode
*inode
, struct file
*filp
)
856 struct kvm
*kvm
= filp
->private_data
;
858 kvm_irqfd_release(kvm
);
865 * Allocation size is twice as large as the actual dirty bitmap size.
866 * See kvm_vm_ioctl_get_dirty_log() why this is needed.
868 static int kvm_alloc_dirty_bitmap(struct kvm_memory_slot
*memslot
)
870 unsigned long dirty_bytes
= 2 * kvm_dirty_bitmap_bytes(memslot
);
872 memslot
->dirty_bitmap
= kvzalloc(dirty_bytes
, GFP_KERNEL_ACCOUNT
);
873 if (!memslot
->dirty_bitmap
)
880 * Delete a memslot by decrementing the number of used slots and shifting all
881 * other entries in the array forward one spot.
883 static inline void kvm_memslot_delete(struct kvm_memslots
*slots
,
884 struct kvm_memory_slot
*memslot
)
886 struct kvm_memory_slot
*mslots
= slots
->memslots
;
889 if (WARN_ON(slots
->id_to_index
[memslot
->id
] == -1))
894 if (atomic_read(&slots
->lru_slot
) >= slots
->used_slots
)
895 atomic_set(&slots
->lru_slot
, 0);
897 for (i
= slots
->id_to_index
[memslot
->id
]; i
< slots
->used_slots
; i
++) {
898 mslots
[i
] = mslots
[i
+ 1];
899 slots
->id_to_index
[mslots
[i
].id
] = i
;
901 mslots
[i
] = *memslot
;
902 slots
->id_to_index
[memslot
->id
] = -1;
906 * "Insert" a new memslot by incrementing the number of used slots. Returns
907 * the new slot's initial index into the memslots array.
909 static inline int kvm_memslot_insert_back(struct kvm_memslots
*slots
)
911 return slots
->used_slots
++;
915 * Move a changed memslot backwards in the array by shifting existing slots
916 * with a higher GFN toward the front of the array. Note, the changed memslot
917 * itself is not preserved in the array, i.e. not swapped at this time, only
918 * its new index into the array is tracked. Returns the changed memslot's
919 * current index into the memslots array.
921 static inline int kvm_memslot_move_backward(struct kvm_memslots
*slots
,
922 struct kvm_memory_slot
*memslot
)
924 struct kvm_memory_slot
*mslots
= slots
->memslots
;
927 if (WARN_ON_ONCE(slots
->id_to_index
[memslot
->id
] == -1) ||
928 WARN_ON_ONCE(!slots
->used_slots
))
932 * Move the target memslot backward in the array by shifting existing
933 * memslots with a higher GFN (than the target memslot) towards the
934 * front of the array.
936 for (i
= slots
->id_to_index
[memslot
->id
]; i
< slots
->used_slots
- 1; i
++) {
937 if (memslot
->base_gfn
> mslots
[i
+ 1].base_gfn
)
940 WARN_ON_ONCE(memslot
->base_gfn
== mslots
[i
+ 1].base_gfn
);
942 /* Shift the next memslot forward one and update its index. */
943 mslots
[i
] = mslots
[i
+ 1];
944 slots
->id_to_index
[mslots
[i
].id
] = i
;
950 * Move a changed memslot forwards in the array by shifting existing slots with
951 * a lower GFN toward the back of the array. Note, the changed memslot itself
952 * is not preserved in the array, i.e. not swapped at this time, only its new
953 * index into the array is tracked. Returns the changed memslot's final index
954 * into the memslots array.
956 static inline int kvm_memslot_move_forward(struct kvm_memslots
*slots
,
957 struct kvm_memory_slot
*memslot
,
960 struct kvm_memory_slot
*mslots
= slots
->memslots
;
963 for (i
= start
; i
> 0; i
--) {
964 if (memslot
->base_gfn
< mslots
[i
- 1].base_gfn
)
967 WARN_ON_ONCE(memslot
->base_gfn
== mslots
[i
- 1].base_gfn
);
969 /* Shift the next memslot back one and update its index. */
970 mslots
[i
] = mslots
[i
- 1];
971 slots
->id_to_index
[mslots
[i
].id
] = i
;
977 * Re-sort memslots based on their GFN to account for an added, deleted, or
978 * moved memslot. Sorting memslots by GFN allows using a binary search during
981 * IMPORTANT: Slots are sorted from highest GFN to lowest GFN! I.e. the entry
982 * at memslots[0] has the highest GFN.
984 * The sorting algorithm takes advantage of having initially sorted memslots
985 * and knowing the position of the changed memslot. Sorting is also optimized
986 * by not swapping the updated memslot and instead only shifting other memslots
987 * and tracking the new index for the update memslot. Only once its final
988 * index is known is the updated memslot copied into its position in the array.
990 * - When deleting a memslot, the deleted memslot simply needs to be moved to
991 * the end of the array.
993 * - When creating a memslot, the algorithm "inserts" the new memslot at the
994 * end of the array and then it forward to its correct location.
996 * - When moving a memslot, the algorithm first moves the updated memslot
997 * backward to handle the scenario where the memslot's GFN was changed to a
998 * lower value. update_memslots() then falls through and runs the same flow
999 * as creating a memslot to move the memslot forward to handle the scenario
1000 * where its GFN was changed to a higher value.
1002 * Note, slots are sorted from highest->lowest instead of lowest->highest for
1003 * historical reasons. Originally, invalid memslots where denoted by having
1004 * GFN=0, thus sorting from highest->lowest naturally sorted invalid memslots
1005 * to the end of the array. The current algorithm uses dedicated logic to
1006 * delete a memslot and thus does not rely on invalid memslots having GFN=0.
1008 * The other historical motiviation for highest->lowest was to improve the
1009 * performance of memslot lookup. KVM originally used a linear search starting
1010 * at memslots[0]. On x86, the largest memslot usually has one of the highest,
1011 * if not *the* highest, GFN, as the bulk of the guest's RAM is located in a
1012 * single memslot above the 4gb boundary. As the largest memslot is also the
1013 * most likely to be referenced, sorting it to the front of the array was
1014 * advantageous. The current binary search starts from the middle of the array
1015 * and uses an LRU pointer to improve performance for all memslots and GFNs.
1017 static void update_memslots(struct kvm_memslots
*slots
,
1018 struct kvm_memory_slot
*memslot
,
1019 enum kvm_mr_change change
)
1023 if (change
== KVM_MR_DELETE
) {
1024 kvm_memslot_delete(slots
, memslot
);
1026 if (change
== KVM_MR_CREATE
)
1027 i
= kvm_memslot_insert_back(slots
);
1029 i
= kvm_memslot_move_backward(slots
, memslot
);
1030 i
= kvm_memslot_move_forward(slots
, memslot
, i
);
1033 * Copy the memslot to its new position in memslots and update
1034 * its index accordingly.
1036 slots
->memslots
[i
] = *memslot
;
1037 slots
->id_to_index
[memslot
->id
] = i
;
1041 static int check_memory_region_flags(const struct kvm_userspace_memory_region
*mem
)
1043 u32 valid_flags
= KVM_MEM_LOG_DIRTY_PAGES
;
1045 #ifdef __KVM_HAVE_READONLY_MEM
1046 valid_flags
|= KVM_MEM_READONLY
;
1049 if (mem
->flags
& ~valid_flags
)
1055 static struct kvm_memslots
*install_new_memslots(struct kvm
*kvm
,
1056 int as_id
, struct kvm_memslots
*slots
)
1058 struct kvm_memslots
*old_memslots
= __kvm_memslots(kvm
, as_id
);
1059 u64 gen
= old_memslots
->generation
;
1061 WARN_ON(gen
& KVM_MEMSLOT_GEN_UPDATE_IN_PROGRESS
);
1062 slots
->generation
= gen
| KVM_MEMSLOT_GEN_UPDATE_IN_PROGRESS
;
1064 rcu_assign_pointer(kvm
->memslots
[as_id
], slots
);
1065 synchronize_srcu_expedited(&kvm
->srcu
);
1068 * Increment the new memslot generation a second time, dropping the
1069 * update in-progress flag and incrementing the generation based on
1070 * the number of address spaces. This provides a unique and easily
1071 * identifiable generation number while the memslots are in flux.
1073 gen
= slots
->generation
& ~KVM_MEMSLOT_GEN_UPDATE_IN_PROGRESS
;
1076 * Generations must be unique even across address spaces. We do not need
1077 * a global counter for that, instead the generation space is evenly split
1078 * across address spaces. For example, with two address spaces, address
1079 * space 0 will use generations 0, 2, 4, ... while address space 1 will
1080 * use generations 1, 3, 5, ...
1082 gen
+= KVM_ADDRESS_SPACE_NUM
;
1084 kvm_arch_memslots_updated(kvm
, gen
);
1086 slots
->generation
= gen
;
1088 return old_memslots
;
1092 * Note, at a minimum, the current number of used slots must be allocated, even
1093 * when deleting a memslot, as we need a complete duplicate of the memslots for
1094 * use when invalidating a memslot prior to deleting/moving the memslot.
1096 static struct kvm_memslots
*kvm_dup_memslots(struct kvm_memslots
*old
,
1097 enum kvm_mr_change change
)
1099 struct kvm_memslots
*slots
;
1100 size_t old_size
, new_size
;
1102 old_size
= sizeof(struct kvm_memslots
) +
1103 (sizeof(struct kvm_memory_slot
) * old
->used_slots
);
1105 if (change
== KVM_MR_CREATE
)
1106 new_size
= old_size
+ sizeof(struct kvm_memory_slot
);
1108 new_size
= old_size
;
1110 slots
= kvzalloc(new_size
, GFP_KERNEL_ACCOUNT
);
1112 memcpy(slots
, old
, old_size
);
1117 static int kvm_set_memslot(struct kvm
*kvm
,
1118 const struct kvm_userspace_memory_region
*mem
,
1119 struct kvm_memory_slot
*old
,
1120 struct kvm_memory_slot
*new, int as_id
,
1121 enum kvm_mr_change change
)
1123 struct kvm_memory_slot
*slot
;
1124 struct kvm_memslots
*slots
;
1127 slots
= kvm_dup_memslots(__kvm_memslots(kvm
, as_id
), change
);
1131 if (change
== KVM_MR_DELETE
|| change
== KVM_MR_MOVE
) {
1133 * Note, the INVALID flag needs to be in the appropriate entry
1134 * in the freshly allocated memslots, not in @old or @new.
1136 slot
= id_to_memslot(slots
, old
->id
);
1137 slot
->flags
|= KVM_MEMSLOT_INVALID
;
1140 * We can re-use the old memslots, the only difference from the
1141 * newly installed memslots is the invalid flag, which will get
1142 * dropped by update_memslots anyway. We'll also revert to the
1143 * old memslots if preparing the new memory region fails.
1145 slots
= install_new_memslots(kvm
, as_id
, slots
);
1147 /* From this point no new shadow pages pointing to a deleted,
1148 * or moved, memslot will be created.
1150 * validation of sp->gfn happens in:
1151 * - gfn_to_hva (kvm_read_guest, gfn_to_pfn)
1152 * - kvm_is_visible_gfn (mmu_check_root)
1154 kvm_arch_flush_shadow_memslot(kvm
, slot
);
1157 r
= kvm_arch_prepare_memory_region(kvm
, new, mem
, change
);
1161 update_memslots(slots
, new, change
);
1162 slots
= install_new_memslots(kvm
, as_id
, slots
);
1164 kvm_arch_commit_memory_region(kvm
, mem
, old
, new, change
);
1170 if (change
== KVM_MR_DELETE
|| change
== KVM_MR_MOVE
)
1171 slots
= install_new_memslots(kvm
, as_id
, slots
);
1176 static int kvm_delete_memslot(struct kvm
*kvm
,
1177 const struct kvm_userspace_memory_region
*mem
,
1178 struct kvm_memory_slot
*old
, int as_id
)
1180 struct kvm_memory_slot
new;
1186 memset(&new, 0, sizeof(new));
1189 r
= kvm_set_memslot(kvm
, mem
, old
, &new, as_id
, KVM_MR_DELETE
);
1193 kvm_free_memslot(kvm
, old
);
1198 * Allocate some memory and give it an address in the guest physical address
1201 * Discontiguous memory is allowed, mostly for framebuffers.
1203 * Must be called holding kvm->slots_lock for write.
1205 int __kvm_set_memory_region(struct kvm
*kvm
,
1206 const struct kvm_userspace_memory_region
*mem
)
1208 struct kvm_memory_slot old
, new;
1209 struct kvm_memory_slot
*tmp
;
1210 enum kvm_mr_change change
;
1214 r
= check_memory_region_flags(mem
);
1218 as_id
= mem
->slot
>> 16;
1219 id
= (u16
)mem
->slot
;
1221 /* General sanity checks */
1222 if (mem
->memory_size
& (PAGE_SIZE
- 1))
1224 if (mem
->guest_phys_addr
& (PAGE_SIZE
- 1))
1226 /* We can read the guest memory with __xxx_user() later on. */
1227 if ((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
);
1613 EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_memslot
);
1615 bool kvm_is_visible_gfn(struct kvm
*kvm
, gfn_t gfn
)
1617 struct kvm_memory_slot
*memslot
= gfn_to_memslot(kvm
, gfn
);
1619 return kvm_is_visible_memslot(memslot
);
1621 EXPORT_SYMBOL_GPL(kvm_is_visible_gfn
);
1623 unsigned long kvm_host_page_size(struct kvm_vcpu
*vcpu
, gfn_t gfn
)
1625 struct vm_area_struct
*vma
;
1626 unsigned long addr
, size
;
1630 addr
= kvm_vcpu_gfn_to_hva_prot(vcpu
, gfn
, NULL
);
1631 if (kvm_is_error_hva(addr
))
1634 mmap_read_lock(current
->mm
);
1635 vma
= find_vma(current
->mm
, addr
);
1639 size
= vma_kernel_pagesize(vma
);
1642 mmap_read_unlock(current
->mm
);
1647 static bool memslot_is_readonly(struct kvm_memory_slot
*slot
)
1649 return slot
->flags
& KVM_MEM_READONLY
;
1652 static unsigned long __gfn_to_hva_many(struct kvm_memory_slot
*slot
, gfn_t gfn
,
1653 gfn_t
*nr_pages
, bool write
)
1655 if (!slot
|| slot
->flags
& KVM_MEMSLOT_INVALID
)
1656 return KVM_HVA_ERR_BAD
;
1658 if (memslot_is_readonly(slot
) && write
)
1659 return KVM_HVA_ERR_RO_BAD
;
1662 *nr_pages
= slot
->npages
- (gfn
- slot
->base_gfn
);
1664 return __gfn_to_hva_memslot(slot
, gfn
);
1667 static unsigned long gfn_to_hva_many(struct kvm_memory_slot
*slot
, gfn_t gfn
,
1670 return __gfn_to_hva_many(slot
, gfn
, nr_pages
, true);
1673 unsigned long gfn_to_hva_memslot(struct kvm_memory_slot
*slot
,
1676 return gfn_to_hva_many(slot
, gfn
, NULL
);
1678 EXPORT_SYMBOL_GPL(gfn_to_hva_memslot
);
1680 unsigned long gfn_to_hva(struct kvm
*kvm
, gfn_t gfn
)
1682 return gfn_to_hva_many(gfn_to_memslot(kvm
, gfn
), gfn
, NULL
);
1684 EXPORT_SYMBOL_GPL(gfn_to_hva
);
1686 unsigned long kvm_vcpu_gfn_to_hva(struct kvm_vcpu
*vcpu
, gfn_t gfn
)
1688 return gfn_to_hva_many(kvm_vcpu_gfn_to_memslot(vcpu
, gfn
), gfn
, NULL
);
1690 EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_hva
);
1693 * Return the hva of a @gfn and the R/W attribute if possible.
1695 * @slot: the kvm_memory_slot which contains @gfn
1696 * @gfn: the gfn to be translated
1697 * @writable: used to return the read/write attribute of the @slot if the hva
1698 * is valid and @writable is not NULL
1700 unsigned long gfn_to_hva_memslot_prot(struct kvm_memory_slot
*slot
,
1701 gfn_t gfn
, bool *writable
)
1703 unsigned long hva
= __gfn_to_hva_many(slot
, gfn
, NULL
, false);
1705 if (!kvm_is_error_hva(hva
) && writable
)
1706 *writable
= !memslot_is_readonly(slot
);
1711 unsigned long gfn_to_hva_prot(struct kvm
*kvm
, gfn_t gfn
, bool *writable
)
1713 struct kvm_memory_slot
*slot
= gfn_to_memslot(kvm
, gfn
);
1715 return gfn_to_hva_memslot_prot(slot
, gfn
, writable
);
1718 unsigned long kvm_vcpu_gfn_to_hva_prot(struct kvm_vcpu
*vcpu
, gfn_t gfn
, bool *writable
)
1720 struct kvm_memory_slot
*slot
= kvm_vcpu_gfn_to_memslot(vcpu
, gfn
);
1722 return gfn_to_hva_memslot_prot(slot
, gfn
, writable
);
1725 static inline int check_user_page_hwpoison(unsigned long addr
)
1727 int rc
, flags
= FOLL_HWPOISON
| FOLL_WRITE
;
1729 rc
= get_user_pages(addr
, 1, flags
, NULL
, NULL
);
1730 return rc
== -EHWPOISON
;
1734 * The fast path to get the writable pfn which will be stored in @pfn,
1735 * true indicates success, otherwise false is returned. It's also the
1736 * only part that runs if we can in atomic context.
1738 static bool hva_to_pfn_fast(unsigned long addr
, bool write_fault
,
1739 bool *writable
, kvm_pfn_t
*pfn
)
1741 struct page
*page
[1];
1744 * Fast pin a writable pfn only if it is a write fault request
1745 * or the caller allows to map a writable pfn for a read fault
1748 if (!(write_fault
|| writable
))
1751 if (get_user_page_fast_only(addr
, FOLL_WRITE
, page
)) {
1752 *pfn
= page_to_pfn(page
[0]);
1763 * The slow path to get the pfn of the specified host virtual address,
1764 * 1 indicates success, -errno is returned if error is detected.
1766 static int hva_to_pfn_slow(unsigned long addr
, bool *async
, bool write_fault
,
1767 bool *writable
, kvm_pfn_t
*pfn
)
1769 unsigned int flags
= FOLL_HWPOISON
;
1776 *writable
= write_fault
;
1779 flags
|= FOLL_WRITE
;
1781 flags
|= FOLL_NOWAIT
;
1783 npages
= get_user_pages_unlocked(addr
, 1, &page
, flags
);
1787 /* map read fault as writable if possible */
1788 if (unlikely(!write_fault
) && writable
) {
1791 if (get_user_page_fast_only(addr
, FOLL_WRITE
, &wpage
)) {
1797 *pfn
= page_to_pfn(page
);
1801 static bool vma_is_valid(struct vm_area_struct
*vma
, bool write_fault
)
1803 if (unlikely(!(vma
->vm_flags
& VM_READ
)))
1806 if (write_fault
&& (unlikely(!(vma
->vm_flags
& VM_WRITE
))))
1812 static int hva_to_pfn_remapped(struct vm_area_struct
*vma
,
1813 unsigned long addr
, bool *async
,
1814 bool write_fault
, bool *writable
,
1820 r
= follow_pfn(vma
, addr
, &pfn
);
1823 * get_user_pages fails for VM_IO and VM_PFNMAP vmas and does
1824 * not call the fault handler, so do it here.
1826 bool unlocked
= false;
1827 r
= fixup_user_fault(current
, current
->mm
, addr
,
1828 (write_fault
? FAULT_FLAG_WRITE
: 0),
1835 r
= follow_pfn(vma
, addr
, &pfn
);
1845 * Get a reference here because callers of *hva_to_pfn* and
1846 * *gfn_to_pfn* ultimately call kvm_release_pfn_clean on the
1847 * returned pfn. This is only needed if the VMA has VM_MIXEDMAP
1848 * set, but the kvm_get_pfn/kvm_release_pfn_clean pair will
1849 * simply do nothing for reserved pfns.
1851 * Whoever called remap_pfn_range is also going to call e.g.
1852 * unmap_mapping_range before the underlying pages are freed,
1853 * causing a call to our MMU notifier.
1862 * Pin guest page in memory and return its pfn.
1863 * @addr: host virtual address which maps memory to the guest
1864 * @atomic: whether this function can sleep
1865 * @async: whether this function need to wait IO complete if the
1866 * host page is not in the memory
1867 * @write_fault: whether we should get a writable host page
1868 * @writable: whether it allows to map a writable host page for !@write_fault
1870 * The function will map a writable host page for these two cases:
1871 * 1): @write_fault = true
1872 * 2): @write_fault = false && @writable, @writable will tell the caller
1873 * whether the mapping is writable.
1875 static kvm_pfn_t
hva_to_pfn(unsigned long addr
, bool atomic
, bool *async
,
1876 bool write_fault
, bool *writable
)
1878 struct vm_area_struct
*vma
;
1882 /* we can do it either atomically or asynchronously, not both */
1883 BUG_ON(atomic
&& async
);
1885 if (hva_to_pfn_fast(addr
, write_fault
, writable
, &pfn
))
1889 return KVM_PFN_ERR_FAULT
;
1891 npages
= hva_to_pfn_slow(addr
, async
, write_fault
, writable
, &pfn
);
1895 mmap_read_lock(current
->mm
);
1896 if (npages
== -EHWPOISON
||
1897 (!async
&& check_user_page_hwpoison(addr
))) {
1898 pfn
= KVM_PFN_ERR_HWPOISON
;
1903 vma
= find_vma_intersection(current
->mm
, addr
, addr
+ 1);
1906 pfn
= KVM_PFN_ERR_FAULT
;
1907 else if (vma
->vm_flags
& (VM_IO
| VM_PFNMAP
)) {
1908 r
= hva_to_pfn_remapped(vma
, addr
, async
, write_fault
, writable
, &pfn
);
1912 pfn
= KVM_PFN_ERR_FAULT
;
1914 if (async
&& vma_is_valid(vma
, write_fault
))
1916 pfn
= KVM_PFN_ERR_FAULT
;
1919 mmap_read_unlock(current
->mm
);
1923 kvm_pfn_t
__gfn_to_pfn_memslot(struct kvm_memory_slot
*slot
, gfn_t gfn
,
1924 bool atomic
, bool *async
, bool write_fault
,
1927 unsigned long addr
= __gfn_to_hva_many(slot
, gfn
, NULL
, write_fault
);
1929 if (addr
== KVM_HVA_ERR_RO_BAD
) {
1932 return KVM_PFN_ERR_RO_FAULT
;
1935 if (kvm_is_error_hva(addr
)) {
1938 return KVM_PFN_NOSLOT
;
1941 /* Do not map writable pfn in the readonly memslot. */
1942 if (writable
&& memslot_is_readonly(slot
)) {
1947 return hva_to_pfn(addr
, atomic
, async
, write_fault
,
1950 EXPORT_SYMBOL_GPL(__gfn_to_pfn_memslot
);
1952 kvm_pfn_t
gfn_to_pfn_prot(struct kvm
*kvm
, gfn_t gfn
, bool write_fault
,
1955 return __gfn_to_pfn_memslot(gfn_to_memslot(kvm
, gfn
), gfn
, false, NULL
,
1956 write_fault
, writable
);
1958 EXPORT_SYMBOL_GPL(gfn_to_pfn_prot
);
1960 kvm_pfn_t
gfn_to_pfn_memslot(struct kvm_memory_slot
*slot
, gfn_t gfn
)
1962 return __gfn_to_pfn_memslot(slot
, gfn
, false, NULL
, true, NULL
);
1964 EXPORT_SYMBOL_GPL(gfn_to_pfn_memslot
);
1966 kvm_pfn_t
gfn_to_pfn_memslot_atomic(struct kvm_memory_slot
*slot
, gfn_t gfn
)
1968 return __gfn_to_pfn_memslot(slot
, gfn
, true, NULL
, true, NULL
);
1970 EXPORT_SYMBOL_GPL(gfn_to_pfn_memslot_atomic
);
1972 kvm_pfn_t
kvm_vcpu_gfn_to_pfn_atomic(struct kvm_vcpu
*vcpu
, gfn_t gfn
)
1974 return gfn_to_pfn_memslot_atomic(kvm_vcpu_gfn_to_memslot(vcpu
, gfn
), gfn
);
1976 EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_pfn_atomic
);
1978 kvm_pfn_t
gfn_to_pfn(struct kvm
*kvm
, gfn_t gfn
)
1980 return gfn_to_pfn_memslot(gfn_to_memslot(kvm
, gfn
), gfn
);
1982 EXPORT_SYMBOL_GPL(gfn_to_pfn
);
1984 kvm_pfn_t
kvm_vcpu_gfn_to_pfn(struct kvm_vcpu
*vcpu
, gfn_t gfn
)
1986 return gfn_to_pfn_memslot(kvm_vcpu_gfn_to_memslot(vcpu
, gfn
), gfn
);
1988 EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_pfn
);
1990 int gfn_to_page_many_atomic(struct kvm_memory_slot
*slot
, gfn_t gfn
,
1991 struct page
**pages
, int nr_pages
)
1996 addr
= gfn_to_hva_many(slot
, gfn
, &entry
);
1997 if (kvm_is_error_hva(addr
))
2000 if (entry
< nr_pages
)
2003 return get_user_pages_fast_only(addr
, nr_pages
, FOLL_WRITE
, pages
);
2005 EXPORT_SYMBOL_GPL(gfn_to_page_many_atomic
);
2007 static struct page
*kvm_pfn_to_page(kvm_pfn_t pfn
)
2009 if (is_error_noslot_pfn(pfn
))
2010 return KVM_ERR_PTR_BAD_PAGE
;
2012 if (kvm_is_reserved_pfn(pfn
)) {
2014 return KVM_ERR_PTR_BAD_PAGE
;
2017 return pfn_to_page(pfn
);
2020 struct page
*gfn_to_page(struct kvm
*kvm
, gfn_t gfn
)
2024 pfn
= gfn_to_pfn(kvm
, gfn
);
2026 return kvm_pfn_to_page(pfn
);
2028 EXPORT_SYMBOL_GPL(gfn_to_page
);
2030 void kvm_release_pfn(kvm_pfn_t pfn
, bool dirty
, struct gfn_to_pfn_cache
*cache
)
2036 cache
->pfn
= cache
->gfn
= 0;
2039 kvm_release_pfn_dirty(pfn
);
2041 kvm_release_pfn_clean(pfn
);
2044 static void kvm_cache_gfn_to_pfn(struct kvm_memory_slot
*slot
, gfn_t gfn
,
2045 struct gfn_to_pfn_cache
*cache
, u64 gen
)
2047 kvm_release_pfn(cache
->pfn
, cache
->dirty
, cache
);
2049 cache
->pfn
= gfn_to_pfn_memslot(slot
, gfn
);
2051 cache
->dirty
= false;
2052 cache
->generation
= gen
;
2055 static int __kvm_map_gfn(struct kvm_memslots
*slots
, gfn_t gfn
,
2056 struct kvm_host_map
*map
,
2057 struct gfn_to_pfn_cache
*cache
,
2062 struct page
*page
= KVM_UNMAPPED_PAGE
;
2063 struct kvm_memory_slot
*slot
= __gfn_to_memslot(slots
, gfn
);
2064 u64 gen
= slots
->generation
;
2070 if (!cache
->pfn
|| cache
->gfn
!= gfn
||
2071 cache
->generation
!= gen
) {
2074 kvm_cache_gfn_to_pfn(slot
, gfn
, cache
, gen
);
2080 pfn
= gfn_to_pfn_memslot(slot
, gfn
);
2082 if (is_error_noslot_pfn(pfn
))
2085 if (pfn_valid(pfn
)) {
2086 page
= pfn_to_page(pfn
);
2088 hva
= kmap_atomic(page
);
2091 #ifdef CONFIG_HAS_IOMEM
2092 } else if (!atomic
) {
2093 hva
= memremap(pfn_to_hpa(pfn
), PAGE_SIZE
, MEMREMAP_WB
);
2110 int kvm_map_gfn(struct kvm_vcpu
*vcpu
, gfn_t gfn
, struct kvm_host_map
*map
,
2111 struct gfn_to_pfn_cache
*cache
, bool atomic
)
2113 return __kvm_map_gfn(kvm_memslots(vcpu
->kvm
), gfn
, map
,
2116 EXPORT_SYMBOL_GPL(kvm_map_gfn
);
2118 int kvm_vcpu_map(struct kvm_vcpu
*vcpu
, gfn_t gfn
, struct kvm_host_map
*map
)
2120 return __kvm_map_gfn(kvm_vcpu_memslots(vcpu
), gfn
, map
,
2123 EXPORT_SYMBOL_GPL(kvm_vcpu_map
);
2125 static void __kvm_unmap_gfn(struct kvm_memory_slot
*memslot
,
2126 struct kvm_host_map
*map
,
2127 struct gfn_to_pfn_cache
*cache
,
2128 bool dirty
, bool atomic
)
2136 if (map
->page
!= KVM_UNMAPPED_PAGE
) {
2138 kunmap_atomic(map
->hva
);
2142 #ifdef CONFIG_HAS_IOMEM
2146 WARN_ONCE(1, "Unexpected unmapping in atomic context");
2150 mark_page_dirty_in_slot(memslot
, map
->gfn
);
2153 cache
->dirty
|= dirty
;
2155 kvm_release_pfn(map
->pfn
, dirty
, NULL
);
2161 int kvm_unmap_gfn(struct kvm_vcpu
*vcpu
, struct kvm_host_map
*map
,
2162 struct gfn_to_pfn_cache
*cache
, bool dirty
, bool atomic
)
2164 __kvm_unmap_gfn(gfn_to_memslot(vcpu
->kvm
, map
->gfn
), map
,
2165 cache
, dirty
, atomic
);
2168 EXPORT_SYMBOL_GPL(kvm_unmap_gfn
);
2170 void kvm_vcpu_unmap(struct kvm_vcpu
*vcpu
, struct kvm_host_map
*map
, bool dirty
)
2172 __kvm_unmap_gfn(kvm_vcpu_gfn_to_memslot(vcpu
, map
->gfn
), map
, NULL
,
2175 EXPORT_SYMBOL_GPL(kvm_vcpu_unmap
);
2177 struct page
*kvm_vcpu_gfn_to_page(struct kvm_vcpu
*vcpu
, gfn_t gfn
)
2181 pfn
= kvm_vcpu_gfn_to_pfn(vcpu
, gfn
);
2183 return kvm_pfn_to_page(pfn
);
2185 EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_page
);
2187 void kvm_release_page_clean(struct page
*page
)
2189 WARN_ON(is_error_page(page
));
2191 kvm_release_pfn_clean(page_to_pfn(page
));
2193 EXPORT_SYMBOL_GPL(kvm_release_page_clean
);
2195 void kvm_release_pfn_clean(kvm_pfn_t pfn
)
2197 if (!is_error_noslot_pfn(pfn
) && !kvm_is_reserved_pfn(pfn
))
2198 put_page(pfn_to_page(pfn
));
2200 EXPORT_SYMBOL_GPL(kvm_release_pfn_clean
);
2202 void kvm_release_page_dirty(struct page
*page
)
2204 WARN_ON(is_error_page(page
));
2206 kvm_release_pfn_dirty(page_to_pfn(page
));
2208 EXPORT_SYMBOL_GPL(kvm_release_page_dirty
);
2210 void kvm_release_pfn_dirty(kvm_pfn_t pfn
)
2212 kvm_set_pfn_dirty(pfn
);
2213 kvm_release_pfn_clean(pfn
);
2215 EXPORT_SYMBOL_GPL(kvm_release_pfn_dirty
);
2217 void kvm_set_pfn_dirty(kvm_pfn_t pfn
)
2219 if (!kvm_is_reserved_pfn(pfn
) && !kvm_is_zone_device_pfn(pfn
))
2220 SetPageDirty(pfn_to_page(pfn
));
2222 EXPORT_SYMBOL_GPL(kvm_set_pfn_dirty
);
2224 void kvm_set_pfn_accessed(kvm_pfn_t pfn
)
2226 if (!kvm_is_reserved_pfn(pfn
) && !kvm_is_zone_device_pfn(pfn
))
2227 mark_page_accessed(pfn_to_page(pfn
));
2229 EXPORT_SYMBOL_GPL(kvm_set_pfn_accessed
);
2231 void kvm_get_pfn(kvm_pfn_t pfn
)
2233 if (!kvm_is_reserved_pfn(pfn
))
2234 get_page(pfn_to_page(pfn
));
2236 EXPORT_SYMBOL_GPL(kvm_get_pfn
);
2238 static int next_segment(unsigned long len
, int offset
)
2240 if (len
> PAGE_SIZE
- offset
)
2241 return PAGE_SIZE
- offset
;
2246 static int __kvm_read_guest_page(struct kvm_memory_slot
*slot
, gfn_t gfn
,
2247 void *data
, int offset
, int len
)
2252 addr
= gfn_to_hva_memslot_prot(slot
, gfn
, NULL
);
2253 if (kvm_is_error_hva(addr
))
2255 r
= __copy_from_user(data
, (void __user
*)addr
+ offset
, len
);
2261 int kvm_read_guest_page(struct kvm
*kvm
, gfn_t gfn
, void *data
, int offset
,
2264 struct kvm_memory_slot
*slot
= gfn_to_memslot(kvm
, gfn
);
2266 return __kvm_read_guest_page(slot
, gfn
, data
, offset
, len
);
2268 EXPORT_SYMBOL_GPL(kvm_read_guest_page
);
2270 int kvm_vcpu_read_guest_page(struct kvm_vcpu
*vcpu
, gfn_t gfn
, void *data
,
2271 int offset
, int len
)
2273 struct kvm_memory_slot
*slot
= kvm_vcpu_gfn_to_memslot(vcpu
, gfn
);
2275 return __kvm_read_guest_page(slot
, gfn
, data
, offset
, len
);
2277 EXPORT_SYMBOL_GPL(kvm_vcpu_read_guest_page
);
2279 int kvm_read_guest(struct kvm
*kvm
, gpa_t gpa
, void *data
, unsigned long len
)
2281 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
2283 int offset
= offset_in_page(gpa
);
2286 while ((seg
= next_segment(len
, offset
)) != 0) {
2287 ret
= kvm_read_guest_page(kvm
, gfn
, data
, offset
, seg
);
2297 EXPORT_SYMBOL_GPL(kvm_read_guest
);
2299 int kvm_vcpu_read_guest(struct kvm_vcpu
*vcpu
, gpa_t gpa
, void *data
, unsigned long len
)
2301 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
2303 int offset
= offset_in_page(gpa
);
2306 while ((seg
= next_segment(len
, offset
)) != 0) {
2307 ret
= kvm_vcpu_read_guest_page(vcpu
, gfn
, data
, offset
, seg
);
2317 EXPORT_SYMBOL_GPL(kvm_vcpu_read_guest
);
2319 static int __kvm_read_guest_atomic(struct kvm_memory_slot
*slot
, gfn_t gfn
,
2320 void *data
, int offset
, unsigned long len
)
2325 addr
= gfn_to_hva_memslot_prot(slot
, gfn
, NULL
);
2326 if (kvm_is_error_hva(addr
))
2328 pagefault_disable();
2329 r
= __copy_from_user_inatomic(data
, (void __user
*)addr
+ offset
, len
);
2336 int kvm_vcpu_read_guest_atomic(struct kvm_vcpu
*vcpu
, gpa_t gpa
,
2337 void *data
, unsigned long len
)
2339 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
2340 struct kvm_memory_slot
*slot
= kvm_vcpu_gfn_to_memslot(vcpu
, gfn
);
2341 int offset
= offset_in_page(gpa
);
2343 return __kvm_read_guest_atomic(slot
, gfn
, data
, offset
, len
);
2345 EXPORT_SYMBOL_GPL(kvm_vcpu_read_guest_atomic
);
2347 static int __kvm_write_guest_page(struct kvm_memory_slot
*memslot
, gfn_t gfn
,
2348 const void *data
, int offset
, int len
)
2353 addr
= gfn_to_hva_memslot(memslot
, gfn
);
2354 if (kvm_is_error_hva(addr
))
2356 r
= __copy_to_user((void __user
*)addr
+ offset
, data
, len
);
2359 mark_page_dirty_in_slot(memslot
, gfn
);
2363 int kvm_write_guest_page(struct kvm
*kvm
, gfn_t gfn
,
2364 const void *data
, int offset
, int len
)
2366 struct kvm_memory_slot
*slot
= gfn_to_memslot(kvm
, gfn
);
2368 return __kvm_write_guest_page(slot
, gfn
, data
, offset
, len
);
2370 EXPORT_SYMBOL_GPL(kvm_write_guest_page
);
2372 int kvm_vcpu_write_guest_page(struct kvm_vcpu
*vcpu
, gfn_t gfn
,
2373 const void *data
, int offset
, int len
)
2375 struct kvm_memory_slot
*slot
= kvm_vcpu_gfn_to_memslot(vcpu
, gfn
);
2377 return __kvm_write_guest_page(slot
, gfn
, data
, offset
, len
);
2379 EXPORT_SYMBOL_GPL(kvm_vcpu_write_guest_page
);
2381 int kvm_write_guest(struct kvm
*kvm
, gpa_t gpa
, const void *data
,
2384 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
2386 int offset
= offset_in_page(gpa
);
2389 while ((seg
= next_segment(len
, offset
)) != 0) {
2390 ret
= kvm_write_guest_page(kvm
, gfn
, data
, offset
, seg
);
2400 EXPORT_SYMBOL_GPL(kvm_write_guest
);
2402 int kvm_vcpu_write_guest(struct kvm_vcpu
*vcpu
, gpa_t gpa
, const void *data
,
2405 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
2407 int offset
= offset_in_page(gpa
);
2410 while ((seg
= next_segment(len
, offset
)) != 0) {
2411 ret
= kvm_vcpu_write_guest_page(vcpu
, gfn
, data
, offset
, seg
);
2421 EXPORT_SYMBOL_GPL(kvm_vcpu_write_guest
);
2423 static int __kvm_gfn_to_hva_cache_init(struct kvm_memslots
*slots
,
2424 struct gfn_to_hva_cache
*ghc
,
2425 gpa_t gpa
, unsigned long len
)
2427 int offset
= offset_in_page(gpa
);
2428 gfn_t start_gfn
= gpa
>> PAGE_SHIFT
;
2429 gfn_t end_gfn
= (gpa
+ len
- 1) >> PAGE_SHIFT
;
2430 gfn_t nr_pages_needed
= end_gfn
- start_gfn
+ 1;
2431 gfn_t nr_pages_avail
;
2433 /* Update ghc->generation before performing any error checks. */
2434 ghc
->generation
= slots
->generation
;
2436 if (start_gfn
> end_gfn
) {
2437 ghc
->hva
= KVM_HVA_ERR_BAD
;
2442 * If the requested region crosses two memslots, we still
2443 * verify that the entire region is valid here.
2445 for ( ; start_gfn
<= end_gfn
; start_gfn
+= nr_pages_avail
) {
2446 ghc
->memslot
= __gfn_to_memslot(slots
, start_gfn
);
2447 ghc
->hva
= gfn_to_hva_many(ghc
->memslot
, start_gfn
,
2449 if (kvm_is_error_hva(ghc
->hva
))
2453 /* Use the slow path for cross page reads and writes. */
2454 if (nr_pages_needed
== 1)
2457 ghc
->memslot
= NULL
;
2464 int kvm_gfn_to_hva_cache_init(struct kvm
*kvm
, struct gfn_to_hva_cache
*ghc
,
2465 gpa_t gpa
, unsigned long len
)
2467 struct kvm_memslots
*slots
= kvm_memslots(kvm
);
2468 return __kvm_gfn_to_hva_cache_init(slots
, ghc
, gpa
, len
);
2470 EXPORT_SYMBOL_GPL(kvm_gfn_to_hva_cache_init
);
2472 int kvm_write_guest_offset_cached(struct kvm
*kvm
, struct gfn_to_hva_cache
*ghc
,
2473 void *data
, unsigned int offset
,
2476 struct kvm_memslots
*slots
= kvm_memslots(kvm
);
2478 gpa_t gpa
= ghc
->gpa
+ offset
;
2480 BUG_ON(len
+ offset
> ghc
->len
);
2482 if (slots
->generation
!= ghc
->generation
) {
2483 if (__kvm_gfn_to_hva_cache_init(slots
, ghc
, ghc
->gpa
, ghc
->len
))
2487 if (kvm_is_error_hva(ghc
->hva
))
2490 if (unlikely(!ghc
->memslot
))
2491 return kvm_write_guest(kvm
, gpa
, data
, len
);
2493 r
= __copy_to_user((void __user
*)ghc
->hva
+ offset
, data
, len
);
2496 mark_page_dirty_in_slot(ghc
->memslot
, gpa
>> PAGE_SHIFT
);
2500 EXPORT_SYMBOL_GPL(kvm_write_guest_offset_cached
);
2502 int kvm_write_guest_cached(struct kvm
*kvm
, struct gfn_to_hva_cache
*ghc
,
2503 void *data
, unsigned long len
)
2505 return kvm_write_guest_offset_cached(kvm
, ghc
, data
, 0, len
);
2507 EXPORT_SYMBOL_GPL(kvm_write_guest_cached
);
2509 int kvm_read_guest_offset_cached(struct kvm
*kvm
, struct gfn_to_hva_cache
*ghc
,
2510 void *data
, unsigned int offset
,
2513 struct kvm_memslots
*slots
= kvm_memslots(kvm
);
2515 gpa_t gpa
= ghc
->gpa
+ offset
;
2517 BUG_ON(len
+ offset
> ghc
->len
);
2519 if (slots
->generation
!= ghc
->generation
) {
2520 if (__kvm_gfn_to_hva_cache_init(slots
, ghc
, ghc
->gpa
, ghc
->len
))
2524 if (kvm_is_error_hva(ghc
->hva
))
2527 if (unlikely(!ghc
->memslot
))
2528 return kvm_read_guest(kvm
, gpa
, data
, len
);
2530 r
= __copy_from_user(data
, (void __user
*)ghc
->hva
+ offset
, len
);
2536 EXPORT_SYMBOL_GPL(kvm_read_guest_offset_cached
);
2538 int kvm_read_guest_cached(struct kvm
*kvm
, struct gfn_to_hva_cache
*ghc
,
2539 void *data
, unsigned long len
)
2541 return kvm_read_guest_offset_cached(kvm
, ghc
, data
, 0, len
);
2543 EXPORT_SYMBOL_GPL(kvm_read_guest_cached
);
2545 int kvm_clear_guest_page(struct kvm
*kvm
, gfn_t gfn
, int offset
, int len
)
2547 const void *zero_page
= (const void *) __va(page_to_phys(ZERO_PAGE(0)));
2549 return kvm_write_guest_page(kvm
, gfn
, zero_page
, offset
, len
);
2551 EXPORT_SYMBOL_GPL(kvm_clear_guest_page
);
2553 int kvm_clear_guest(struct kvm
*kvm
, gpa_t gpa
, unsigned long len
)
2555 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
2557 int offset
= offset_in_page(gpa
);
2560 while ((seg
= next_segment(len
, offset
)) != 0) {
2561 ret
= kvm_clear_guest_page(kvm
, gfn
, offset
, seg
);
2570 EXPORT_SYMBOL_GPL(kvm_clear_guest
);
2572 static void mark_page_dirty_in_slot(struct kvm_memory_slot
*memslot
,
2575 if (memslot
&& memslot
->dirty_bitmap
) {
2576 unsigned long rel_gfn
= gfn
- memslot
->base_gfn
;
2578 set_bit_le(rel_gfn
, memslot
->dirty_bitmap
);
2582 void mark_page_dirty(struct kvm
*kvm
, gfn_t gfn
)
2584 struct kvm_memory_slot
*memslot
;
2586 memslot
= gfn_to_memslot(kvm
, gfn
);
2587 mark_page_dirty_in_slot(memslot
, gfn
);
2589 EXPORT_SYMBOL_GPL(mark_page_dirty
);
2591 void kvm_vcpu_mark_page_dirty(struct kvm_vcpu
*vcpu
, gfn_t gfn
)
2593 struct kvm_memory_slot
*memslot
;
2595 memslot
= kvm_vcpu_gfn_to_memslot(vcpu
, gfn
);
2596 mark_page_dirty_in_slot(memslot
, gfn
);
2598 EXPORT_SYMBOL_GPL(kvm_vcpu_mark_page_dirty
);
2600 void kvm_sigset_activate(struct kvm_vcpu
*vcpu
)
2602 if (!vcpu
->sigset_active
)
2606 * This does a lockless modification of ->real_blocked, which is fine
2607 * because, only current can change ->real_blocked and all readers of
2608 * ->real_blocked don't care as long ->real_blocked is always a subset
2611 sigprocmask(SIG_SETMASK
, &vcpu
->sigset
, ¤t
->real_blocked
);
2614 void kvm_sigset_deactivate(struct kvm_vcpu
*vcpu
)
2616 if (!vcpu
->sigset_active
)
2619 sigprocmask(SIG_SETMASK
, ¤t
->real_blocked
, NULL
);
2620 sigemptyset(¤t
->real_blocked
);
2623 static void grow_halt_poll_ns(struct kvm_vcpu
*vcpu
)
2625 unsigned int old
, val
, grow
, grow_start
;
2627 old
= val
= vcpu
->halt_poll_ns
;
2628 grow_start
= READ_ONCE(halt_poll_ns_grow_start
);
2629 grow
= READ_ONCE(halt_poll_ns_grow
);
2634 if (val
< grow_start
)
2637 if (val
> halt_poll_ns
)
2640 vcpu
->halt_poll_ns
= val
;
2642 trace_kvm_halt_poll_ns_grow(vcpu
->vcpu_id
, val
, old
);
2645 static void shrink_halt_poll_ns(struct kvm_vcpu
*vcpu
)
2647 unsigned int old
, val
, shrink
;
2649 old
= val
= vcpu
->halt_poll_ns
;
2650 shrink
= READ_ONCE(halt_poll_ns_shrink
);
2656 vcpu
->halt_poll_ns
= val
;
2657 trace_kvm_halt_poll_ns_shrink(vcpu
->vcpu_id
, val
, old
);
2660 static int kvm_vcpu_check_block(struct kvm_vcpu
*vcpu
)
2663 int idx
= srcu_read_lock(&vcpu
->kvm
->srcu
);
2665 if (kvm_arch_vcpu_runnable(vcpu
)) {
2666 kvm_make_request(KVM_REQ_UNHALT
, vcpu
);
2669 if (kvm_cpu_has_pending_timer(vcpu
))
2671 if (signal_pending(current
))
2676 srcu_read_unlock(&vcpu
->kvm
->srcu
, idx
);
2681 update_halt_poll_stats(struct kvm_vcpu
*vcpu
, u64 poll_ns
, bool waited
)
2684 vcpu
->stat
.halt_poll_fail_ns
+= poll_ns
;
2686 vcpu
->stat
.halt_poll_success_ns
+= poll_ns
;
2690 * The vCPU has executed a HLT instruction with in-kernel mode enabled.
2692 void kvm_vcpu_block(struct kvm_vcpu
*vcpu
)
2694 ktime_t start
, cur
, poll_end
;
2695 bool waited
= false;
2698 kvm_arch_vcpu_blocking(vcpu
);
2700 start
= cur
= poll_end
= ktime_get();
2701 if (vcpu
->halt_poll_ns
&& !kvm_arch_no_poll(vcpu
)) {
2702 ktime_t stop
= ktime_add_ns(ktime_get(), vcpu
->halt_poll_ns
);
2704 ++vcpu
->stat
.halt_attempted_poll
;
2707 * This sets KVM_REQ_UNHALT if an interrupt
2710 if (kvm_vcpu_check_block(vcpu
) < 0) {
2711 ++vcpu
->stat
.halt_successful_poll
;
2712 if (!vcpu_valid_wakeup(vcpu
))
2713 ++vcpu
->stat
.halt_poll_invalid
;
2716 poll_end
= cur
= ktime_get();
2717 } while (single_task_running() && ktime_before(cur
, stop
));
2720 prepare_to_rcuwait(&vcpu
->wait
);
2722 set_current_state(TASK_INTERRUPTIBLE
);
2724 if (kvm_vcpu_check_block(vcpu
) < 0)
2730 finish_rcuwait(&vcpu
->wait
);
2733 kvm_arch_vcpu_unblocking(vcpu
);
2734 block_ns
= ktime_to_ns(cur
) - ktime_to_ns(start
);
2736 update_halt_poll_stats(
2737 vcpu
, ktime_to_ns(ktime_sub(poll_end
, start
)), waited
);
2739 if (!kvm_arch_no_poll(vcpu
)) {
2740 if (!vcpu_valid_wakeup(vcpu
)) {
2741 shrink_halt_poll_ns(vcpu
);
2742 } else if (vcpu
->kvm
->max_halt_poll_ns
) {
2743 if (block_ns
<= vcpu
->halt_poll_ns
)
2745 /* we had a long block, shrink polling */
2746 else if (vcpu
->halt_poll_ns
&&
2747 block_ns
> vcpu
->kvm
->max_halt_poll_ns
)
2748 shrink_halt_poll_ns(vcpu
);
2749 /* we had a short halt and our poll time is too small */
2750 else if (vcpu
->halt_poll_ns
< vcpu
->kvm
->max_halt_poll_ns
&&
2751 block_ns
< vcpu
->kvm
->max_halt_poll_ns
)
2752 grow_halt_poll_ns(vcpu
);
2754 vcpu
->halt_poll_ns
= 0;
2758 trace_kvm_vcpu_wakeup(block_ns
, waited
, vcpu_valid_wakeup(vcpu
));
2759 kvm_arch_vcpu_block_finish(vcpu
);
2761 EXPORT_SYMBOL_GPL(kvm_vcpu_block
);
2763 bool kvm_vcpu_wake_up(struct kvm_vcpu
*vcpu
)
2765 struct rcuwait
*waitp
;
2767 waitp
= kvm_arch_vcpu_get_wait(vcpu
);
2768 if (rcuwait_wake_up(waitp
)) {
2769 WRITE_ONCE(vcpu
->ready
, true);
2770 ++vcpu
->stat
.halt_wakeup
;
2776 EXPORT_SYMBOL_GPL(kvm_vcpu_wake_up
);
2780 * Kick a sleeping VCPU, or a guest VCPU in guest mode, into host kernel mode.
2782 void kvm_vcpu_kick(struct kvm_vcpu
*vcpu
)
2785 int cpu
= vcpu
->cpu
;
2787 if (kvm_vcpu_wake_up(vcpu
))
2791 if (cpu
!= me
&& (unsigned)cpu
< nr_cpu_ids
&& cpu_online(cpu
))
2792 if (kvm_arch_vcpu_should_kick(vcpu
))
2793 smp_send_reschedule(cpu
);
2796 EXPORT_SYMBOL_GPL(kvm_vcpu_kick
);
2797 #endif /* !CONFIG_S390 */
2799 int kvm_vcpu_yield_to(struct kvm_vcpu
*target
)
2802 struct task_struct
*task
= NULL
;
2806 pid
= rcu_dereference(target
->pid
);
2808 task
= get_pid_task(pid
, PIDTYPE_PID
);
2812 ret
= yield_to(task
, 1);
2813 put_task_struct(task
);
2817 EXPORT_SYMBOL_GPL(kvm_vcpu_yield_to
);
2820 * Helper that checks whether a VCPU is eligible for directed yield.
2821 * Most eligible candidate to yield is decided by following heuristics:
2823 * (a) VCPU which has not done pl-exit or cpu relax intercepted recently
2824 * (preempted lock holder), indicated by @in_spin_loop.
2825 * Set at the beginning and cleared at the end of interception/PLE handler.
2827 * (b) VCPU which has done pl-exit/ cpu relax intercepted but did not get
2828 * chance last time (mostly it has become eligible now since we have probably
2829 * yielded to lockholder in last iteration. This is done by toggling
2830 * @dy_eligible each time a VCPU checked for eligibility.)
2832 * Yielding to a recently pl-exited/cpu relax intercepted VCPU before yielding
2833 * to preempted lock-holder could result in wrong VCPU selection and CPU
2834 * burning. Giving priority for a potential lock-holder increases lock
2837 * Since algorithm is based on heuristics, accessing another VCPU data without
2838 * locking does not harm. It may result in trying to yield to same VCPU, fail
2839 * and continue with next VCPU and so on.
2841 static bool kvm_vcpu_eligible_for_directed_yield(struct kvm_vcpu
*vcpu
)
2843 #ifdef CONFIG_HAVE_KVM_CPU_RELAX_INTERCEPT
2846 eligible
= !vcpu
->spin_loop
.in_spin_loop
||
2847 vcpu
->spin_loop
.dy_eligible
;
2849 if (vcpu
->spin_loop
.in_spin_loop
)
2850 kvm_vcpu_set_dy_eligible(vcpu
, !vcpu
->spin_loop
.dy_eligible
);
2859 * Unlike kvm_arch_vcpu_runnable, this function is called outside
2860 * a vcpu_load/vcpu_put pair. However, for most architectures
2861 * kvm_arch_vcpu_runnable does not require vcpu_load.
2863 bool __weak
kvm_arch_dy_runnable(struct kvm_vcpu
*vcpu
)
2865 return kvm_arch_vcpu_runnable(vcpu
);
2868 static bool vcpu_dy_runnable(struct kvm_vcpu
*vcpu
)
2870 if (kvm_arch_dy_runnable(vcpu
))
2873 #ifdef CONFIG_KVM_ASYNC_PF
2874 if (!list_empty_careful(&vcpu
->async_pf
.done
))
2881 void kvm_vcpu_on_spin(struct kvm_vcpu
*me
, bool yield_to_kernel_mode
)
2883 struct kvm
*kvm
= me
->kvm
;
2884 struct kvm_vcpu
*vcpu
;
2885 int last_boosted_vcpu
= me
->kvm
->last_boosted_vcpu
;
2891 kvm_vcpu_set_in_spin_loop(me
, true);
2893 * We boost the priority of a VCPU that is runnable but not
2894 * currently running, because it got preempted by something
2895 * else and called schedule in __vcpu_run. Hopefully that
2896 * VCPU is holding the lock that we need and will release it.
2897 * We approximate round-robin by starting at the last boosted VCPU.
2899 for (pass
= 0; pass
< 2 && !yielded
&& try; pass
++) {
2900 kvm_for_each_vcpu(i
, vcpu
, kvm
) {
2901 if (!pass
&& i
<= last_boosted_vcpu
) {
2902 i
= last_boosted_vcpu
;
2904 } else if (pass
&& i
> last_boosted_vcpu
)
2906 if (!READ_ONCE(vcpu
->ready
))
2910 if (rcuwait_active(&vcpu
->wait
) &&
2911 !vcpu_dy_runnable(vcpu
))
2913 if (READ_ONCE(vcpu
->preempted
) && yield_to_kernel_mode
&&
2914 !kvm_arch_vcpu_in_kernel(vcpu
))
2916 if (!kvm_vcpu_eligible_for_directed_yield(vcpu
))
2919 yielded
= kvm_vcpu_yield_to(vcpu
);
2921 kvm
->last_boosted_vcpu
= i
;
2923 } else if (yielded
< 0) {
2930 kvm_vcpu_set_in_spin_loop(me
, false);
2932 /* Ensure vcpu is not eligible during next spinloop */
2933 kvm_vcpu_set_dy_eligible(me
, false);
2935 EXPORT_SYMBOL_GPL(kvm_vcpu_on_spin
);
2937 static vm_fault_t
kvm_vcpu_fault(struct vm_fault
*vmf
)
2939 struct kvm_vcpu
*vcpu
= vmf
->vma
->vm_file
->private_data
;
2942 if (vmf
->pgoff
== 0)
2943 page
= virt_to_page(vcpu
->run
);
2945 else if (vmf
->pgoff
== KVM_PIO_PAGE_OFFSET
)
2946 page
= virt_to_page(vcpu
->arch
.pio_data
);
2948 #ifdef CONFIG_KVM_MMIO
2949 else if (vmf
->pgoff
== KVM_COALESCED_MMIO_PAGE_OFFSET
)
2950 page
= virt_to_page(vcpu
->kvm
->coalesced_mmio_ring
);
2953 return kvm_arch_vcpu_fault(vcpu
, vmf
);
2959 static const struct vm_operations_struct kvm_vcpu_vm_ops
= {
2960 .fault
= kvm_vcpu_fault
,
2963 static int kvm_vcpu_mmap(struct file
*file
, struct vm_area_struct
*vma
)
2965 vma
->vm_ops
= &kvm_vcpu_vm_ops
;
2969 static int kvm_vcpu_release(struct inode
*inode
, struct file
*filp
)
2971 struct kvm_vcpu
*vcpu
= filp
->private_data
;
2973 debugfs_remove_recursive(vcpu
->debugfs_dentry
);
2974 kvm_put_kvm(vcpu
->kvm
);
2978 static struct file_operations kvm_vcpu_fops
= {
2979 .release
= kvm_vcpu_release
,
2980 .unlocked_ioctl
= kvm_vcpu_ioctl
,
2981 .mmap
= kvm_vcpu_mmap
,
2982 .llseek
= noop_llseek
,
2983 KVM_COMPAT(kvm_vcpu_compat_ioctl
),
2987 * Allocates an inode for the vcpu.
2989 static int create_vcpu_fd(struct kvm_vcpu
*vcpu
)
2991 char name
[8 + 1 + ITOA_MAX_LEN
+ 1];
2993 snprintf(name
, sizeof(name
), "kvm-vcpu:%d", vcpu
->vcpu_id
);
2994 return anon_inode_getfd(name
, &kvm_vcpu_fops
, vcpu
, O_RDWR
| O_CLOEXEC
);
2997 static void kvm_create_vcpu_debugfs(struct kvm_vcpu
*vcpu
)
2999 #ifdef __KVM_HAVE_ARCH_VCPU_DEBUGFS
3000 char dir_name
[ITOA_MAX_LEN
* 2];
3002 if (!debugfs_initialized())
3005 snprintf(dir_name
, sizeof(dir_name
), "vcpu%d", vcpu
->vcpu_id
);
3006 vcpu
->debugfs_dentry
= debugfs_create_dir(dir_name
,
3007 vcpu
->kvm
->debugfs_dentry
);
3009 kvm_arch_create_vcpu_debugfs(vcpu
);
3014 * Creates some virtual cpus. Good luck creating more than one.
3016 static int kvm_vm_ioctl_create_vcpu(struct kvm
*kvm
, u32 id
)
3019 struct kvm_vcpu
*vcpu
;
3022 if (id
>= KVM_MAX_VCPU_ID
)
3025 mutex_lock(&kvm
->lock
);
3026 if (kvm
->created_vcpus
== KVM_MAX_VCPUS
) {
3027 mutex_unlock(&kvm
->lock
);
3031 kvm
->created_vcpus
++;
3032 mutex_unlock(&kvm
->lock
);
3034 r
= kvm_arch_vcpu_precreate(kvm
, id
);
3036 goto vcpu_decrement
;
3038 vcpu
= kmem_cache_zalloc(kvm_vcpu_cache
, GFP_KERNEL
);
3041 goto vcpu_decrement
;
3044 BUILD_BUG_ON(sizeof(struct kvm_run
) > PAGE_SIZE
);
3045 page
= alloc_page(GFP_KERNEL
| __GFP_ZERO
);
3050 vcpu
->run
= page_address(page
);
3052 kvm_vcpu_init(vcpu
, kvm
, id
);
3054 r
= kvm_arch_vcpu_create(vcpu
);
3056 goto vcpu_free_run_page
;
3058 mutex_lock(&kvm
->lock
);
3059 if (kvm_get_vcpu_by_id(kvm
, id
)) {
3061 goto unlock_vcpu_destroy
;
3064 vcpu
->vcpu_idx
= atomic_read(&kvm
->online_vcpus
);
3065 BUG_ON(kvm
->vcpus
[vcpu
->vcpu_idx
]);
3067 /* Now it's all set up, let userspace reach it */
3069 r
= create_vcpu_fd(vcpu
);
3071 kvm_put_kvm_no_destroy(kvm
);
3072 goto unlock_vcpu_destroy
;
3075 kvm
->vcpus
[vcpu
->vcpu_idx
] = vcpu
;
3078 * Pairs with smp_rmb() in kvm_get_vcpu. Write kvm->vcpus
3079 * before kvm->online_vcpu's incremented value.
3082 atomic_inc(&kvm
->online_vcpus
);
3084 mutex_unlock(&kvm
->lock
);
3085 kvm_arch_vcpu_postcreate(vcpu
);
3086 kvm_create_vcpu_debugfs(vcpu
);
3089 unlock_vcpu_destroy
:
3090 mutex_unlock(&kvm
->lock
);
3091 kvm_arch_vcpu_destroy(vcpu
);
3093 free_page((unsigned long)vcpu
->run
);
3095 kmem_cache_free(kvm_vcpu_cache
, vcpu
);
3097 mutex_lock(&kvm
->lock
);
3098 kvm
->created_vcpus
--;
3099 mutex_unlock(&kvm
->lock
);
3103 static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu
*vcpu
, sigset_t
*sigset
)
3106 sigdelsetmask(sigset
, sigmask(SIGKILL
)|sigmask(SIGSTOP
));
3107 vcpu
->sigset_active
= 1;
3108 vcpu
->sigset
= *sigset
;
3110 vcpu
->sigset_active
= 0;
3114 static long kvm_vcpu_ioctl(struct file
*filp
,
3115 unsigned int ioctl
, unsigned long arg
)
3117 struct kvm_vcpu
*vcpu
= filp
->private_data
;
3118 void __user
*argp
= (void __user
*)arg
;
3120 struct kvm_fpu
*fpu
= NULL
;
3121 struct kvm_sregs
*kvm_sregs
= NULL
;
3123 if (vcpu
->kvm
->mm
!= current
->mm
)
3126 if (unlikely(_IOC_TYPE(ioctl
) != KVMIO
))
3130 * Some architectures have vcpu ioctls that are asynchronous to vcpu
3131 * execution; mutex_lock() would break them.
3133 r
= kvm_arch_vcpu_async_ioctl(filp
, ioctl
, arg
);
3134 if (r
!= -ENOIOCTLCMD
)
3137 if (mutex_lock_killable(&vcpu
->mutex
))
3145 oldpid
= rcu_access_pointer(vcpu
->pid
);
3146 if (unlikely(oldpid
!= task_pid(current
))) {
3147 /* The thread running this VCPU changed. */
3150 r
= kvm_arch_vcpu_run_pid_change(vcpu
);
3154 newpid
= get_task_pid(current
, PIDTYPE_PID
);
3155 rcu_assign_pointer(vcpu
->pid
, newpid
);
3160 r
= kvm_arch_vcpu_ioctl_run(vcpu
);
3161 trace_kvm_userspace_exit(vcpu
->run
->exit_reason
, r
);
3164 case KVM_GET_REGS
: {
3165 struct kvm_regs
*kvm_regs
;
3168 kvm_regs
= kzalloc(sizeof(struct kvm_regs
), GFP_KERNEL_ACCOUNT
);
3171 r
= kvm_arch_vcpu_ioctl_get_regs(vcpu
, kvm_regs
);
3175 if (copy_to_user(argp
, kvm_regs
, sizeof(struct kvm_regs
)))
3182 case KVM_SET_REGS
: {
3183 struct kvm_regs
*kvm_regs
;
3185 kvm_regs
= memdup_user(argp
, sizeof(*kvm_regs
));
3186 if (IS_ERR(kvm_regs
)) {
3187 r
= PTR_ERR(kvm_regs
);
3190 r
= kvm_arch_vcpu_ioctl_set_regs(vcpu
, kvm_regs
);
3194 case KVM_GET_SREGS
: {
3195 kvm_sregs
= kzalloc(sizeof(struct kvm_sregs
),
3196 GFP_KERNEL_ACCOUNT
);
3200 r
= kvm_arch_vcpu_ioctl_get_sregs(vcpu
, kvm_sregs
);
3204 if (copy_to_user(argp
, kvm_sregs
, sizeof(struct kvm_sregs
)))
3209 case KVM_SET_SREGS
: {
3210 kvm_sregs
= memdup_user(argp
, sizeof(*kvm_sregs
));
3211 if (IS_ERR(kvm_sregs
)) {
3212 r
= PTR_ERR(kvm_sregs
);
3216 r
= kvm_arch_vcpu_ioctl_set_sregs(vcpu
, kvm_sregs
);
3219 case KVM_GET_MP_STATE
: {
3220 struct kvm_mp_state mp_state
;
3222 r
= kvm_arch_vcpu_ioctl_get_mpstate(vcpu
, &mp_state
);
3226 if (copy_to_user(argp
, &mp_state
, sizeof(mp_state
)))
3231 case KVM_SET_MP_STATE
: {
3232 struct kvm_mp_state mp_state
;
3235 if (copy_from_user(&mp_state
, argp
, sizeof(mp_state
)))
3237 r
= kvm_arch_vcpu_ioctl_set_mpstate(vcpu
, &mp_state
);
3240 case KVM_TRANSLATE
: {
3241 struct kvm_translation tr
;
3244 if (copy_from_user(&tr
, argp
, sizeof(tr
)))
3246 r
= kvm_arch_vcpu_ioctl_translate(vcpu
, &tr
);
3250 if (copy_to_user(argp
, &tr
, sizeof(tr
)))
3255 case KVM_SET_GUEST_DEBUG
: {
3256 struct kvm_guest_debug dbg
;
3259 if (copy_from_user(&dbg
, argp
, sizeof(dbg
)))
3261 r
= kvm_arch_vcpu_ioctl_set_guest_debug(vcpu
, &dbg
);
3264 case KVM_SET_SIGNAL_MASK
: {
3265 struct kvm_signal_mask __user
*sigmask_arg
= argp
;
3266 struct kvm_signal_mask kvm_sigmask
;
3267 sigset_t sigset
, *p
;
3272 if (copy_from_user(&kvm_sigmask
, argp
,
3273 sizeof(kvm_sigmask
)))
3276 if (kvm_sigmask
.len
!= sizeof(sigset
))
3279 if (copy_from_user(&sigset
, sigmask_arg
->sigset
,
3284 r
= kvm_vcpu_ioctl_set_sigmask(vcpu
, p
);
3288 fpu
= kzalloc(sizeof(struct kvm_fpu
), GFP_KERNEL_ACCOUNT
);
3292 r
= kvm_arch_vcpu_ioctl_get_fpu(vcpu
, fpu
);
3296 if (copy_to_user(argp
, fpu
, sizeof(struct kvm_fpu
)))
3302 fpu
= memdup_user(argp
, sizeof(*fpu
));
3308 r
= kvm_arch_vcpu_ioctl_set_fpu(vcpu
, fpu
);
3312 r
= kvm_arch_vcpu_ioctl(filp
, ioctl
, arg
);
3315 mutex_unlock(&vcpu
->mutex
);
3321 #ifdef CONFIG_KVM_COMPAT
3322 static long kvm_vcpu_compat_ioctl(struct file
*filp
,
3323 unsigned int ioctl
, unsigned long arg
)
3325 struct kvm_vcpu
*vcpu
= filp
->private_data
;
3326 void __user
*argp
= compat_ptr(arg
);
3329 if (vcpu
->kvm
->mm
!= current
->mm
)
3333 case KVM_SET_SIGNAL_MASK
: {
3334 struct kvm_signal_mask __user
*sigmask_arg
= argp
;
3335 struct kvm_signal_mask kvm_sigmask
;
3340 if (copy_from_user(&kvm_sigmask
, argp
,
3341 sizeof(kvm_sigmask
)))
3344 if (kvm_sigmask
.len
!= sizeof(compat_sigset_t
))
3347 if (get_compat_sigset(&sigset
, (void *)sigmask_arg
->sigset
))
3349 r
= kvm_vcpu_ioctl_set_sigmask(vcpu
, &sigset
);
3351 r
= kvm_vcpu_ioctl_set_sigmask(vcpu
, NULL
);
3355 r
= kvm_vcpu_ioctl(filp
, ioctl
, arg
);
3363 static int kvm_device_mmap(struct file
*filp
, struct vm_area_struct
*vma
)
3365 struct kvm_device
*dev
= filp
->private_data
;
3368 return dev
->ops
->mmap(dev
, vma
);
3373 static int kvm_device_ioctl_attr(struct kvm_device
*dev
,
3374 int (*accessor
)(struct kvm_device
*dev
,
3375 struct kvm_device_attr
*attr
),
3378 struct kvm_device_attr attr
;
3383 if (copy_from_user(&attr
, (void __user
*)arg
, sizeof(attr
)))
3386 return accessor(dev
, &attr
);
3389 static long kvm_device_ioctl(struct file
*filp
, unsigned int ioctl
,
3392 struct kvm_device
*dev
= filp
->private_data
;
3394 if (dev
->kvm
->mm
!= current
->mm
)
3398 case KVM_SET_DEVICE_ATTR
:
3399 return kvm_device_ioctl_attr(dev
, dev
->ops
->set_attr
, arg
);
3400 case KVM_GET_DEVICE_ATTR
:
3401 return kvm_device_ioctl_attr(dev
, dev
->ops
->get_attr
, arg
);
3402 case KVM_HAS_DEVICE_ATTR
:
3403 return kvm_device_ioctl_attr(dev
, dev
->ops
->has_attr
, arg
);
3405 if (dev
->ops
->ioctl
)
3406 return dev
->ops
->ioctl(dev
, ioctl
, arg
);
3412 static int kvm_device_release(struct inode
*inode
, struct file
*filp
)
3414 struct kvm_device
*dev
= filp
->private_data
;
3415 struct kvm
*kvm
= dev
->kvm
;
3417 if (dev
->ops
->release
) {
3418 mutex_lock(&kvm
->lock
);
3419 list_del(&dev
->vm_node
);
3420 dev
->ops
->release(dev
);
3421 mutex_unlock(&kvm
->lock
);
3428 static const struct file_operations kvm_device_fops
= {
3429 .unlocked_ioctl
= kvm_device_ioctl
,
3430 .release
= kvm_device_release
,
3431 KVM_COMPAT(kvm_device_ioctl
),
3432 .mmap
= kvm_device_mmap
,
3435 struct kvm_device
*kvm_device_from_filp(struct file
*filp
)
3437 if (filp
->f_op
!= &kvm_device_fops
)
3440 return filp
->private_data
;
3443 static const struct kvm_device_ops
*kvm_device_ops_table
[KVM_DEV_TYPE_MAX
] = {
3444 #ifdef CONFIG_KVM_MPIC
3445 [KVM_DEV_TYPE_FSL_MPIC_20
] = &kvm_mpic_ops
,
3446 [KVM_DEV_TYPE_FSL_MPIC_42
] = &kvm_mpic_ops
,
3450 int kvm_register_device_ops(const struct kvm_device_ops
*ops
, u32 type
)
3452 if (type
>= ARRAY_SIZE(kvm_device_ops_table
))
3455 if (kvm_device_ops_table
[type
] != NULL
)
3458 kvm_device_ops_table
[type
] = ops
;
3462 void kvm_unregister_device_ops(u32 type
)
3464 if (kvm_device_ops_table
[type
] != NULL
)
3465 kvm_device_ops_table
[type
] = NULL
;
3468 static int kvm_ioctl_create_device(struct kvm
*kvm
,
3469 struct kvm_create_device
*cd
)
3471 const struct kvm_device_ops
*ops
= NULL
;
3472 struct kvm_device
*dev
;
3473 bool test
= cd
->flags
& KVM_CREATE_DEVICE_TEST
;
3477 if (cd
->type
>= ARRAY_SIZE(kvm_device_ops_table
))
3480 type
= array_index_nospec(cd
->type
, ARRAY_SIZE(kvm_device_ops_table
));
3481 ops
= kvm_device_ops_table
[type
];
3488 dev
= kzalloc(sizeof(*dev
), GFP_KERNEL_ACCOUNT
);
3495 mutex_lock(&kvm
->lock
);
3496 ret
= ops
->create(dev
, type
);
3498 mutex_unlock(&kvm
->lock
);
3502 list_add(&dev
->vm_node
, &kvm
->devices
);
3503 mutex_unlock(&kvm
->lock
);
3509 ret
= anon_inode_getfd(ops
->name
, &kvm_device_fops
, dev
, O_RDWR
| O_CLOEXEC
);
3511 kvm_put_kvm_no_destroy(kvm
);
3512 mutex_lock(&kvm
->lock
);
3513 list_del(&dev
->vm_node
);
3514 mutex_unlock(&kvm
->lock
);
3523 static long kvm_vm_ioctl_check_extension_generic(struct kvm
*kvm
, long arg
)
3526 case KVM_CAP_USER_MEMORY
:
3527 case KVM_CAP_DESTROY_MEMORY_REGION_WORKS
:
3528 case KVM_CAP_JOIN_MEMORY_REGIONS_WORKS
:
3529 case KVM_CAP_INTERNAL_ERROR_DATA
:
3530 #ifdef CONFIG_HAVE_KVM_MSI
3531 case KVM_CAP_SIGNAL_MSI
:
3533 #ifdef CONFIG_HAVE_KVM_IRQFD
3535 case KVM_CAP_IRQFD_RESAMPLE
:
3537 case KVM_CAP_IOEVENTFD_ANY_LENGTH
:
3538 case KVM_CAP_CHECK_EXTENSION_VM
:
3539 case KVM_CAP_ENABLE_CAP_VM
:
3540 case KVM_CAP_HALT_POLL
:
3542 #ifdef CONFIG_KVM_MMIO
3543 case KVM_CAP_COALESCED_MMIO
:
3544 return KVM_COALESCED_MMIO_PAGE_OFFSET
;
3545 case KVM_CAP_COALESCED_PIO
:
3548 #ifdef CONFIG_KVM_GENERIC_DIRTYLOG_READ_PROTECT
3549 case KVM_CAP_MANUAL_DIRTY_LOG_PROTECT2
:
3550 return KVM_DIRTY_LOG_MANUAL_CAPS
;
3552 #ifdef CONFIG_HAVE_KVM_IRQ_ROUTING
3553 case KVM_CAP_IRQ_ROUTING
:
3554 return KVM_MAX_IRQ_ROUTES
;
3556 #if KVM_ADDRESS_SPACE_NUM > 1
3557 case KVM_CAP_MULTI_ADDRESS_SPACE
:
3558 return KVM_ADDRESS_SPACE_NUM
;
3560 case KVM_CAP_NR_MEMSLOTS
:
3561 return KVM_USER_MEM_SLOTS
;
3565 return kvm_vm_ioctl_check_extension(kvm
, arg
);
3568 int __attribute__((weak
)) kvm_vm_ioctl_enable_cap(struct kvm
*kvm
,
3569 struct kvm_enable_cap
*cap
)
3574 static int kvm_vm_ioctl_enable_cap_generic(struct kvm
*kvm
,
3575 struct kvm_enable_cap
*cap
)
3578 #ifdef CONFIG_KVM_GENERIC_DIRTYLOG_READ_PROTECT
3579 case KVM_CAP_MANUAL_DIRTY_LOG_PROTECT2
: {
3580 u64 allowed_options
= KVM_DIRTY_LOG_MANUAL_PROTECT_ENABLE
;
3582 if (cap
->args
[0] & KVM_DIRTY_LOG_MANUAL_PROTECT_ENABLE
)
3583 allowed_options
= KVM_DIRTY_LOG_MANUAL_CAPS
;
3585 if (cap
->flags
|| (cap
->args
[0] & ~allowed_options
))
3587 kvm
->manual_dirty_log_protect
= cap
->args
[0];
3591 case KVM_CAP_HALT_POLL
: {
3592 if (cap
->flags
|| cap
->args
[0] != (unsigned int)cap
->args
[0])
3595 kvm
->max_halt_poll_ns
= cap
->args
[0];
3599 return kvm_vm_ioctl_enable_cap(kvm
, cap
);
3603 static long kvm_vm_ioctl(struct file
*filp
,
3604 unsigned int ioctl
, unsigned long arg
)
3606 struct kvm
*kvm
= filp
->private_data
;
3607 void __user
*argp
= (void __user
*)arg
;
3610 if (kvm
->mm
!= current
->mm
)
3613 case KVM_CREATE_VCPU
:
3614 r
= kvm_vm_ioctl_create_vcpu(kvm
, arg
);
3616 case KVM_ENABLE_CAP
: {
3617 struct kvm_enable_cap cap
;
3620 if (copy_from_user(&cap
, argp
, sizeof(cap
)))
3622 r
= kvm_vm_ioctl_enable_cap_generic(kvm
, &cap
);
3625 case KVM_SET_USER_MEMORY_REGION
: {
3626 struct kvm_userspace_memory_region kvm_userspace_mem
;
3629 if (copy_from_user(&kvm_userspace_mem
, argp
,
3630 sizeof(kvm_userspace_mem
)))
3633 r
= kvm_vm_ioctl_set_memory_region(kvm
, &kvm_userspace_mem
);
3636 case KVM_GET_DIRTY_LOG
: {
3637 struct kvm_dirty_log log
;
3640 if (copy_from_user(&log
, argp
, sizeof(log
)))
3642 r
= kvm_vm_ioctl_get_dirty_log(kvm
, &log
);
3645 #ifdef CONFIG_KVM_GENERIC_DIRTYLOG_READ_PROTECT
3646 case KVM_CLEAR_DIRTY_LOG
: {
3647 struct kvm_clear_dirty_log log
;
3650 if (copy_from_user(&log
, argp
, sizeof(log
)))
3652 r
= kvm_vm_ioctl_clear_dirty_log(kvm
, &log
);
3656 #ifdef CONFIG_KVM_MMIO
3657 case KVM_REGISTER_COALESCED_MMIO
: {
3658 struct kvm_coalesced_mmio_zone zone
;
3661 if (copy_from_user(&zone
, argp
, sizeof(zone
)))
3663 r
= kvm_vm_ioctl_register_coalesced_mmio(kvm
, &zone
);
3666 case KVM_UNREGISTER_COALESCED_MMIO
: {
3667 struct kvm_coalesced_mmio_zone zone
;
3670 if (copy_from_user(&zone
, argp
, sizeof(zone
)))
3672 r
= kvm_vm_ioctl_unregister_coalesced_mmio(kvm
, &zone
);
3677 struct kvm_irqfd data
;
3680 if (copy_from_user(&data
, argp
, sizeof(data
)))
3682 r
= kvm_irqfd(kvm
, &data
);
3685 case KVM_IOEVENTFD
: {
3686 struct kvm_ioeventfd data
;
3689 if (copy_from_user(&data
, argp
, sizeof(data
)))
3691 r
= kvm_ioeventfd(kvm
, &data
);
3694 #ifdef CONFIG_HAVE_KVM_MSI
3695 case KVM_SIGNAL_MSI
: {
3699 if (copy_from_user(&msi
, argp
, sizeof(msi
)))
3701 r
= kvm_send_userspace_msi(kvm
, &msi
);
3705 #ifdef __KVM_HAVE_IRQ_LINE
3706 case KVM_IRQ_LINE_STATUS
:
3707 case KVM_IRQ_LINE
: {
3708 struct kvm_irq_level irq_event
;
3711 if (copy_from_user(&irq_event
, argp
, sizeof(irq_event
)))
3714 r
= kvm_vm_ioctl_irq_line(kvm
, &irq_event
,
3715 ioctl
== KVM_IRQ_LINE_STATUS
);
3720 if (ioctl
== KVM_IRQ_LINE_STATUS
) {
3721 if (copy_to_user(argp
, &irq_event
, sizeof(irq_event
)))
3729 #ifdef CONFIG_HAVE_KVM_IRQ_ROUTING
3730 case KVM_SET_GSI_ROUTING
: {
3731 struct kvm_irq_routing routing
;
3732 struct kvm_irq_routing __user
*urouting
;
3733 struct kvm_irq_routing_entry
*entries
= NULL
;
3736 if (copy_from_user(&routing
, argp
, sizeof(routing
)))
3739 if (!kvm_arch_can_set_irq_routing(kvm
))
3741 if (routing
.nr
> KVM_MAX_IRQ_ROUTES
)
3747 entries
= vmalloc(array_size(sizeof(*entries
),
3753 if (copy_from_user(entries
, urouting
->entries
,
3754 routing
.nr
* sizeof(*entries
)))
3755 goto out_free_irq_routing
;
3757 r
= kvm_set_irq_routing(kvm
, entries
, routing
.nr
,
3759 out_free_irq_routing
:
3763 #endif /* CONFIG_HAVE_KVM_IRQ_ROUTING */
3764 case KVM_CREATE_DEVICE
: {
3765 struct kvm_create_device cd
;
3768 if (copy_from_user(&cd
, argp
, sizeof(cd
)))
3771 r
= kvm_ioctl_create_device(kvm
, &cd
);
3776 if (copy_to_user(argp
, &cd
, sizeof(cd
)))
3782 case KVM_CHECK_EXTENSION
:
3783 r
= kvm_vm_ioctl_check_extension_generic(kvm
, arg
);
3786 r
= kvm_arch_vm_ioctl(filp
, ioctl
, arg
);
3792 #ifdef CONFIG_KVM_COMPAT
3793 struct compat_kvm_dirty_log
{
3797 compat_uptr_t dirty_bitmap
; /* one bit per page */
3802 static long kvm_vm_compat_ioctl(struct file
*filp
,
3803 unsigned int ioctl
, unsigned long arg
)
3805 struct kvm
*kvm
= filp
->private_data
;
3808 if (kvm
->mm
!= current
->mm
)
3811 case KVM_GET_DIRTY_LOG
: {
3812 struct compat_kvm_dirty_log compat_log
;
3813 struct kvm_dirty_log log
;
3815 if (copy_from_user(&compat_log
, (void __user
*)arg
,
3816 sizeof(compat_log
)))
3818 log
.slot
= compat_log
.slot
;
3819 log
.padding1
= compat_log
.padding1
;
3820 log
.padding2
= compat_log
.padding2
;
3821 log
.dirty_bitmap
= compat_ptr(compat_log
.dirty_bitmap
);
3823 r
= kvm_vm_ioctl_get_dirty_log(kvm
, &log
);
3827 r
= kvm_vm_ioctl(filp
, ioctl
, arg
);
3833 static struct file_operations kvm_vm_fops
= {
3834 .release
= kvm_vm_release
,
3835 .unlocked_ioctl
= kvm_vm_ioctl
,
3836 .llseek
= noop_llseek
,
3837 KVM_COMPAT(kvm_vm_compat_ioctl
),
3840 static int kvm_dev_ioctl_create_vm(unsigned long type
)
3846 kvm
= kvm_create_vm(type
);
3848 return PTR_ERR(kvm
);
3849 #ifdef CONFIG_KVM_MMIO
3850 r
= kvm_coalesced_mmio_init(kvm
);
3854 r
= get_unused_fd_flags(O_CLOEXEC
);
3858 file
= anon_inode_getfile("kvm-vm", &kvm_vm_fops
, kvm
, O_RDWR
);
3866 * Don't call kvm_put_kvm anymore at this point; file->f_op is
3867 * already set, with ->release() being kvm_vm_release(). In error
3868 * cases it will be called by the final fput(file) and will take
3869 * care of doing kvm_put_kvm(kvm).
3871 if (kvm_create_vm_debugfs(kvm
, r
) < 0) {
3876 kvm_uevent_notify_change(KVM_EVENT_CREATE_VM
, kvm
);
3878 fd_install(r
, file
);
3886 static long kvm_dev_ioctl(struct file
*filp
,
3887 unsigned int ioctl
, unsigned long arg
)
3892 case KVM_GET_API_VERSION
:
3895 r
= KVM_API_VERSION
;
3898 r
= kvm_dev_ioctl_create_vm(arg
);
3900 case KVM_CHECK_EXTENSION
:
3901 r
= kvm_vm_ioctl_check_extension_generic(NULL
, arg
);
3903 case KVM_GET_VCPU_MMAP_SIZE
:
3906 r
= PAGE_SIZE
; /* struct kvm_run */
3908 r
+= PAGE_SIZE
; /* pio data page */
3910 #ifdef CONFIG_KVM_MMIO
3911 r
+= PAGE_SIZE
; /* coalesced mmio ring page */
3914 case KVM_TRACE_ENABLE
:
3915 case KVM_TRACE_PAUSE
:
3916 case KVM_TRACE_DISABLE
:
3920 return kvm_arch_dev_ioctl(filp
, ioctl
, arg
);
3926 static struct file_operations kvm_chardev_ops
= {
3927 .unlocked_ioctl
= kvm_dev_ioctl
,
3928 .llseek
= noop_llseek
,
3929 KVM_COMPAT(kvm_dev_ioctl
),
3932 static struct miscdevice kvm_dev
= {
3938 static void hardware_enable_nolock(void *junk
)
3940 int cpu
= raw_smp_processor_id();
3943 if (cpumask_test_cpu(cpu
, cpus_hardware_enabled
))
3946 cpumask_set_cpu(cpu
, cpus_hardware_enabled
);
3948 r
= kvm_arch_hardware_enable();
3951 cpumask_clear_cpu(cpu
, cpus_hardware_enabled
);
3952 atomic_inc(&hardware_enable_failed
);
3953 pr_info("kvm: enabling virtualization on CPU%d failed\n", cpu
);
3957 static int kvm_starting_cpu(unsigned int cpu
)
3959 raw_spin_lock(&kvm_count_lock
);
3960 if (kvm_usage_count
)
3961 hardware_enable_nolock(NULL
);
3962 raw_spin_unlock(&kvm_count_lock
);
3966 static void hardware_disable_nolock(void *junk
)
3968 int cpu
= raw_smp_processor_id();
3970 if (!cpumask_test_cpu(cpu
, cpus_hardware_enabled
))
3972 cpumask_clear_cpu(cpu
, cpus_hardware_enabled
);
3973 kvm_arch_hardware_disable();
3976 static int kvm_dying_cpu(unsigned int cpu
)
3978 raw_spin_lock(&kvm_count_lock
);
3979 if (kvm_usage_count
)
3980 hardware_disable_nolock(NULL
);
3981 raw_spin_unlock(&kvm_count_lock
);
3985 static void hardware_disable_all_nolock(void)
3987 BUG_ON(!kvm_usage_count
);
3990 if (!kvm_usage_count
)
3991 on_each_cpu(hardware_disable_nolock
, NULL
, 1);
3994 static void hardware_disable_all(void)
3996 raw_spin_lock(&kvm_count_lock
);
3997 hardware_disable_all_nolock();
3998 raw_spin_unlock(&kvm_count_lock
);
4001 static int hardware_enable_all(void)
4005 raw_spin_lock(&kvm_count_lock
);
4008 if (kvm_usage_count
== 1) {
4009 atomic_set(&hardware_enable_failed
, 0);
4010 on_each_cpu(hardware_enable_nolock
, NULL
, 1);
4012 if (atomic_read(&hardware_enable_failed
)) {
4013 hardware_disable_all_nolock();
4018 raw_spin_unlock(&kvm_count_lock
);
4023 static int kvm_reboot(struct notifier_block
*notifier
, unsigned long val
,
4027 * Some (well, at least mine) BIOSes hang on reboot if
4030 * And Intel TXT required VMX off for all cpu when system shutdown.
4032 pr_info("kvm: exiting hardware virtualization\n");
4033 kvm_rebooting
= true;
4034 on_each_cpu(hardware_disable_nolock
, NULL
, 1);
4038 static struct notifier_block kvm_reboot_notifier
= {
4039 .notifier_call
= kvm_reboot
,
4043 static void kvm_io_bus_destroy(struct kvm_io_bus
*bus
)
4047 for (i
= 0; i
< bus
->dev_count
; i
++) {
4048 struct kvm_io_device
*pos
= bus
->range
[i
].dev
;
4050 kvm_iodevice_destructor(pos
);
4055 static inline int kvm_io_bus_cmp(const struct kvm_io_range
*r1
,
4056 const struct kvm_io_range
*r2
)
4058 gpa_t addr1
= r1
->addr
;
4059 gpa_t addr2
= r2
->addr
;
4064 /* If r2->len == 0, match the exact address. If r2->len != 0,
4065 * accept any overlapping write. Any order is acceptable for
4066 * overlapping ranges, because kvm_io_bus_get_first_dev ensures
4067 * we process all of them.
4080 static int kvm_io_bus_sort_cmp(const void *p1
, const void *p2
)
4082 return kvm_io_bus_cmp(p1
, p2
);
4085 static int kvm_io_bus_get_first_dev(struct kvm_io_bus
*bus
,
4086 gpa_t addr
, int len
)
4088 struct kvm_io_range
*range
, key
;
4091 key
= (struct kvm_io_range
) {
4096 range
= bsearch(&key
, bus
->range
, bus
->dev_count
,
4097 sizeof(struct kvm_io_range
), kvm_io_bus_sort_cmp
);
4101 off
= range
- bus
->range
;
4103 while (off
> 0 && kvm_io_bus_cmp(&key
, &bus
->range
[off
-1]) == 0)
4109 static int __kvm_io_bus_write(struct kvm_vcpu
*vcpu
, struct kvm_io_bus
*bus
,
4110 struct kvm_io_range
*range
, const void *val
)
4114 idx
= kvm_io_bus_get_first_dev(bus
, range
->addr
, range
->len
);
4118 while (idx
< bus
->dev_count
&&
4119 kvm_io_bus_cmp(range
, &bus
->range
[idx
]) == 0) {
4120 if (!kvm_iodevice_write(vcpu
, bus
->range
[idx
].dev
, range
->addr
,
4129 /* kvm_io_bus_write - called under kvm->slots_lock */
4130 int kvm_io_bus_write(struct kvm_vcpu
*vcpu
, enum kvm_bus bus_idx
, gpa_t addr
,
4131 int len
, const void *val
)
4133 struct kvm_io_bus
*bus
;
4134 struct kvm_io_range range
;
4137 range
= (struct kvm_io_range
) {
4142 bus
= srcu_dereference(vcpu
->kvm
->buses
[bus_idx
], &vcpu
->kvm
->srcu
);
4145 r
= __kvm_io_bus_write(vcpu
, bus
, &range
, val
);
4146 return r
< 0 ? r
: 0;
4148 EXPORT_SYMBOL_GPL(kvm_io_bus_write
);
4150 /* kvm_io_bus_write_cookie - called under kvm->slots_lock */
4151 int kvm_io_bus_write_cookie(struct kvm_vcpu
*vcpu
, enum kvm_bus bus_idx
,
4152 gpa_t addr
, int len
, const void *val
, long cookie
)
4154 struct kvm_io_bus
*bus
;
4155 struct kvm_io_range range
;
4157 range
= (struct kvm_io_range
) {
4162 bus
= srcu_dereference(vcpu
->kvm
->buses
[bus_idx
], &vcpu
->kvm
->srcu
);
4166 /* First try the device referenced by cookie. */
4167 if ((cookie
>= 0) && (cookie
< bus
->dev_count
) &&
4168 (kvm_io_bus_cmp(&range
, &bus
->range
[cookie
]) == 0))
4169 if (!kvm_iodevice_write(vcpu
, bus
->range
[cookie
].dev
, addr
, len
,
4174 * cookie contained garbage; fall back to search and return the
4175 * correct cookie value.
4177 return __kvm_io_bus_write(vcpu
, bus
, &range
, val
);
4180 static int __kvm_io_bus_read(struct kvm_vcpu
*vcpu
, struct kvm_io_bus
*bus
,
4181 struct kvm_io_range
*range
, void *val
)
4185 idx
= kvm_io_bus_get_first_dev(bus
, range
->addr
, range
->len
);
4189 while (idx
< bus
->dev_count
&&
4190 kvm_io_bus_cmp(range
, &bus
->range
[idx
]) == 0) {
4191 if (!kvm_iodevice_read(vcpu
, bus
->range
[idx
].dev
, range
->addr
,
4200 /* kvm_io_bus_read - called under kvm->slots_lock */
4201 int kvm_io_bus_read(struct kvm_vcpu
*vcpu
, enum kvm_bus bus_idx
, gpa_t addr
,
4204 struct kvm_io_bus
*bus
;
4205 struct kvm_io_range range
;
4208 range
= (struct kvm_io_range
) {
4213 bus
= srcu_dereference(vcpu
->kvm
->buses
[bus_idx
], &vcpu
->kvm
->srcu
);
4216 r
= __kvm_io_bus_read(vcpu
, bus
, &range
, val
);
4217 return r
< 0 ? r
: 0;
4220 /* Caller must hold slots_lock. */
4221 int kvm_io_bus_register_dev(struct kvm
*kvm
, enum kvm_bus bus_idx
, gpa_t addr
,
4222 int len
, struct kvm_io_device
*dev
)
4225 struct kvm_io_bus
*new_bus
, *bus
;
4226 struct kvm_io_range range
;
4228 bus
= kvm_get_bus(kvm
, bus_idx
);
4232 /* exclude ioeventfd which is limited by maximum fd */
4233 if (bus
->dev_count
- bus
->ioeventfd_count
> NR_IOBUS_DEVS
- 1)
4236 new_bus
= kmalloc(struct_size(bus
, range
, bus
->dev_count
+ 1),
4237 GFP_KERNEL_ACCOUNT
);
4241 range
= (struct kvm_io_range
) {
4247 for (i
= 0; i
< bus
->dev_count
; i
++)
4248 if (kvm_io_bus_cmp(&bus
->range
[i
], &range
) > 0)
4251 memcpy(new_bus
, bus
, sizeof(*bus
) + i
* sizeof(struct kvm_io_range
));
4252 new_bus
->dev_count
++;
4253 new_bus
->range
[i
] = range
;
4254 memcpy(new_bus
->range
+ i
+ 1, bus
->range
+ i
,
4255 (bus
->dev_count
- i
) * sizeof(struct kvm_io_range
));
4256 rcu_assign_pointer(kvm
->buses
[bus_idx
], new_bus
);
4257 synchronize_srcu_expedited(&kvm
->srcu
);
4263 /* Caller must hold slots_lock. */
4264 void kvm_io_bus_unregister_dev(struct kvm
*kvm
, enum kvm_bus bus_idx
,
4265 struct kvm_io_device
*dev
)
4268 struct kvm_io_bus
*new_bus
, *bus
;
4270 bus
= kvm_get_bus(kvm
, bus_idx
);
4274 for (i
= 0; i
< bus
->dev_count
; i
++)
4275 if (bus
->range
[i
].dev
== dev
) {
4279 if (i
== bus
->dev_count
)
4282 new_bus
= kmalloc(struct_size(bus
, range
, bus
->dev_count
- 1),
4283 GFP_KERNEL_ACCOUNT
);
4285 pr_err("kvm: failed to shrink bus, removing it completely\n");
4289 memcpy(new_bus
, bus
, sizeof(*bus
) + i
* sizeof(struct kvm_io_range
));
4290 new_bus
->dev_count
--;
4291 memcpy(new_bus
->range
+ i
, bus
->range
+ i
+ 1,
4292 (new_bus
->dev_count
- i
) * sizeof(struct kvm_io_range
));
4295 rcu_assign_pointer(kvm
->buses
[bus_idx
], new_bus
);
4296 synchronize_srcu_expedited(&kvm
->srcu
);
4301 struct kvm_io_device
*kvm_io_bus_get_dev(struct kvm
*kvm
, enum kvm_bus bus_idx
,
4304 struct kvm_io_bus
*bus
;
4305 int dev_idx
, srcu_idx
;
4306 struct kvm_io_device
*iodev
= NULL
;
4308 srcu_idx
= srcu_read_lock(&kvm
->srcu
);
4310 bus
= srcu_dereference(kvm
->buses
[bus_idx
], &kvm
->srcu
);
4314 dev_idx
= kvm_io_bus_get_first_dev(bus
, addr
, 1);
4318 iodev
= bus
->range
[dev_idx
].dev
;
4321 srcu_read_unlock(&kvm
->srcu
, srcu_idx
);
4325 EXPORT_SYMBOL_GPL(kvm_io_bus_get_dev
);
4327 static int kvm_debugfs_open(struct inode
*inode
, struct file
*file
,
4328 int (*get
)(void *, u64
*), int (*set
)(void *, u64
),
4331 struct kvm_stat_data
*stat_data
= (struct kvm_stat_data
*)
4334 /* The debugfs files are a reference to the kvm struct which
4335 * is still valid when kvm_destroy_vm is called.
4336 * To avoid the race between open and the removal of the debugfs
4337 * directory we test against the users count.
4339 if (!refcount_inc_not_zero(&stat_data
->kvm
->users_count
))
4342 if (simple_attr_open(inode
, file
, get
,
4343 KVM_DBGFS_GET_MODE(stat_data
->dbgfs_item
) & 0222
4346 kvm_put_kvm(stat_data
->kvm
);
4353 static int kvm_debugfs_release(struct inode
*inode
, struct file
*file
)
4355 struct kvm_stat_data
*stat_data
= (struct kvm_stat_data
*)
4358 simple_attr_release(inode
, file
);
4359 kvm_put_kvm(stat_data
->kvm
);
4364 static int kvm_get_stat_per_vm(struct kvm
*kvm
, size_t offset
, u64
*val
)
4366 *val
= *(ulong
*)((void *)kvm
+ offset
);
4371 static int kvm_clear_stat_per_vm(struct kvm
*kvm
, size_t offset
)
4373 *(ulong
*)((void *)kvm
+ offset
) = 0;
4378 static int kvm_get_stat_per_vcpu(struct kvm
*kvm
, size_t offset
, u64
*val
)
4381 struct kvm_vcpu
*vcpu
;
4385 kvm_for_each_vcpu(i
, vcpu
, kvm
)
4386 *val
+= *(u64
*)((void *)vcpu
+ offset
);
4391 static int kvm_clear_stat_per_vcpu(struct kvm
*kvm
, size_t offset
)
4394 struct kvm_vcpu
*vcpu
;
4396 kvm_for_each_vcpu(i
, vcpu
, kvm
)
4397 *(u64
*)((void *)vcpu
+ offset
) = 0;
4402 static int kvm_stat_data_get(void *data
, u64
*val
)
4405 struct kvm_stat_data
*stat_data
= (struct kvm_stat_data
*)data
;
4407 switch (stat_data
->dbgfs_item
->kind
) {
4409 r
= kvm_get_stat_per_vm(stat_data
->kvm
,
4410 stat_data
->dbgfs_item
->offset
, val
);
4413 r
= kvm_get_stat_per_vcpu(stat_data
->kvm
,
4414 stat_data
->dbgfs_item
->offset
, val
);
4421 static int kvm_stat_data_clear(void *data
, u64 val
)
4424 struct kvm_stat_data
*stat_data
= (struct kvm_stat_data
*)data
;
4429 switch (stat_data
->dbgfs_item
->kind
) {
4431 r
= kvm_clear_stat_per_vm(stat_data
->kvm
,
4432 stat_data
->dbgfs_item
->offset
);
4435 r
= kvm_clear_stat_per_vcpu(stat_data
->kvm
,
4436 stat_data
->dbgfs_item
->offset
);
4443 static int kvm_stat_data_open(struct inode
*inode
, struct file
*file
)
4445 __simple_attr_check_format("%llu\n", 0ull);
4446 return kvm_debugfs_open(inode
, file
, kvm_stat_data_get
,
4447 kvm_stat_data_clear
, "%llu\n");
4450 static const struct file_operations stat_fops_per_vm
= {
4451 .owner
= THIS_MODULE
,
4452 .open
= kvm_stat_data_open
,
4453 .release
= kvm_debugfs_release
,
4454 .read
= simple_attr_read
,
4455 .write
= simple_attr_write
,
4456 .llseek
= no_llseek
,
4459 static int vm_stat_get(void *_offset
, u64
*val
)
4461 unsigned offset
= (long)_offset
;
4466 mutex_lock(&kvm_lock
);
4467 list_for_each_entry(kvm
, &vm_list
, vm_list
) {
4468 kvm_get_stat_per_vm(kvm
, offset
, &tmp_val
);
4471 mutex_unlock(&kvm_lock
);
4475 static int vm_stat_clear(void *_offset
, u64 val
)
4477 unsigned offset
= (long)_offset
;
4483 mutex_lock(&kvm_lock
);
4484 list_for_each_entry(kvm
, &vm_list
, vm_list
) {
4485 kvm_clear_stat_per_vm(kvm
, offset
);
4487 mutex_unlock(&kvm_lock
);
4492 DEFINE_SIMPLE_ATTRIBUTE(vm_stat_fops
, vm_stat_get
, vm_stat_clear
, "%llu\n");
4494 static int vcpu_stat_get(void *_offset
, u64
*val
)
4496 unsigned offset
= (long)_offset
;
4501 mutex_lock(&kvm_lock
);
4502 list_for_each_entry(kvm
, &vm_list
, vm_list
) {
4503 kvm_get_stat_per_vcpu(kvm
, offset
, &tmp_val
);
4506 mutex_unlock(&kvm_lock
);
4510 static int vcpu_stat_clear(void *_offset
, u64 val
)
4512 unsigned offset
= (long)_offset
;
4518 mutex_lock(&kvm_lock
);
4519 list_for_each_entry(kvm
, &vm_list
, vm_list
) {
4520 kvm_clear_stat_per_vcpu(kvm
, offset
);
4522 mutex_unlock(&kvm_lock
);
4527 DEFINE_SIMPLE_ATTRIBUTE(vcpu_stat_fops
, vcpu_stat_get
, vcpu_stat_clear
,
4530 static const struct file_operations
*stat_fops
[] = {
4531 [KVM_STAT_VCPU
] = &vcpu_stat_fops
,
4532 [KVM_STAT_VM
] = &vm_stat_fops
,
4535 static void kvm_uevent_notify_change(unsigned int type
, struct kvm
*kvm
)
4537 struct kobj_uevent_env
*env
;
4538 unsigned long long created
, active
;
4540 if (!kvm_dev
.this_device
|| !kvm
)
4543 mutex_lock(&kvm_lock
);
4544 if (type
== KVM_EVENT_CREATE_VM
) {
4545 kvm_createvm_count
++;
4547 } else if (type
== KVM_EVENT_DESTROY_VM
) {
4550 created
= kvm_createvm_count
;
4551 active
= kvm_active_vms
;
4552 mutex_unlock(&kvm_lock
);
4554 env
= kzalloc(sizeof(*env
), GFP_KERNEL_ACCOUNT
);
4558 add_uevent_var(env
, "CREATED=%llu", created
);
4559 add_uevent_var(env
, "COUNT=%llu", active
);
4561 if (type
== KVM_EVENT_CREATE_VM
) {
4562 add_uevent_var(env
, "EVENT=create");
4563 kvm
->userspace_pid
= task_pid_nr(current
);
4564 } else if (type
== KVM_EVENT_DESTROY_VM
) {
4565 add_uevent_var(env
, "EVENT=destroy");
4567 add_uevent_var(env
, "PID=%d", kvm
->userspace_pid
);
4569 if (!IS_ERR_OR_NULL(kvm
->debugfs_dentry
)) {
4570 char *tmp
, *p
= kmalloc(PATH_MAX
, GFP_KERNEL_ACCOUNT
);
4573 tmp
= dentry_path_raw(kvm
->debugfs_dentry
, p
, PATH_MAX
);
4575 add_uevent_var(env
, "STATS_PATH=%s", tmp
);
4579 /* no need for checks, since we are adding at most only 5 keys */
4580 env
->envp
[env
->envp_idx
++] = NULL
;
4581 kobject_uevent_env(&kvm_dev
.this_device
->kobj
, KOBJ_CHANGE
, env
->envp
);
4585 static void kvm_init_debug(void)
4587 struct kvm_stats_debugfs_item
*p
;
4589 kvm_debugfs_dir
= debugfs_create_dir("kvm", NULL
);
4591 kvm_debugfs_num_entries
= 0;
4592 for (p
= debugfs_entries
; p
->name
; ++p
, kvm_debugfs_num_entries
++) {
4593 debugfs_create_file(p
->name
, KVM_DBGFS_GET_MODE(p
),
4594 kvm_debugfs_dir
, (void *)(long)p
->offset
,
4595 stat_fops
[p
->kind
]);
4599 static int kvm_suspend(void)
4601 if (kvm_usage_count
)
4602 hardware_disable_nolock(NULL
);
4606 static void kvm_resume(void)
4608 if (kvm_usage_count
) {
4609 #ifdef CONFIG_LOCKDEP
4610 WARN_ON(lockdep_is_held(&kvm_count_lock
));
4612 hardware_enable_nolock(NULL
);
4616 static struct syscore_ops kvm_syscore_ops
= {
4617 .suspend
= kvm_suspend
,
4618 .resume
= kvm_resume
,
4622 struct kvm_vcpu
*preempt_notifier_to_vcpu(struct preempt_notifier
*pn
)
4624 return container_of(pn
, struct kvm_vcpu
, preempt_notifier
);
4627 static void kvm_sched_in(struct preempt_notifier
*pn
, int cpu
)
4629 struct kvm_vcpu
*vcpu
= preempt_notifier_to_vcpu(pn
);
4631 WRITE_ONCE(vcpu
->preempted
, false);
4632 WRITE_ONCE(vcpu
->ready
, false);
4634 __this_cpu_write(kvm_running_vcpu
, vcpu
);
4635 kvm_arch_sched_in(vcpu
, cpu
);
4636 kvm_arch_vcpu_load(vcpu
, cpu
);
4639 static void kvm_sched_out(struct preempt_notifier
*pn
,
4640 struct task_struct
*next
)
4642 struct kvm_vcpu
*vcpu
= preempt_notifier_to_vcpu(pn
);
4644 if (current
->state
== TASK_RUNNING
) {
4645 WRITE_ONCE(vcpu
->preempted
, true);
4646 WRITE_ONCE(vcpu
->ready
, true);
4648 kvm_arch_vcpu_put(vcpu
);
4649 __this_cpu_write(kvm_running_vcpu
, NULL
);
4653 * kvm_get_running_vcpu - get the vcpu running on the current CPU.
4655 * We can disable preemption locally around accessing the per-CPU variable,
4656 * and use the resolved vcpu pointer after enabling preemption again,
4657 * because even if the current thread is migrated to another CPU, reading
4658 * the per-CPU value later will give us the same value as we update the
4659 * per-CPU variable in the preempt notifier handlers.
4661 struct kvm_vcpu
*kvm_get_running_vcpu(void)
4663 struct kvm_vcpu
*vcpu
;
4666 vcpu
= __this_cpu_read(kvm_running_vcpu
);
4671 EXPORT_SYMBOL_GPL(kvm_get_running_vcpu
);
4674 * kvm_get_running_vcpus - get the per-CPU array of currently running vcpus.
4676 struct kvm_vcpu
* __percpu
*kvm_get_running_vcpus(void)
4678 return &kvm_running_vcpu
;
4681 struct kvm_cpu_compat_check
{
4686 static void check_processor_compat(void *data
)
4688 struct kvm_cpu_compat_check
*c
= data
;
4690 *c
->ret
= kvm_arch_check_processor_compat(c
->opaque
);
4693 int kvm_init(void *opaque
, unsigned vcpu_size
, unsigned vcpu_align
,
4694 struct module
*module
)
4696 struct kvm_cpu_compat_check c
;
4700 r
= kvm_arch_init(opaque
);
4705 * kvm_arch_init makes sure there's at most one caller
4706 * for architectures that support multiple implementations,
4707 * like intel and amd on x86.
4708 * kvm_arch_init must be called before kvm_irqfd_init to avoid creating
4709 * conflicts in case kvm is already setup for another implementation.
4711 r
= kvm_irqfd_init();
4715 if (!zalloc_cpumask_var(&cpus_hardware_enabled
, GFP_KERNEL
)) {
4720 r
= kvm_arch_hardware_setup(opaque
);
4726 for_each_online_cpu(cpu
) {
4727 smp_call_function_single(cpu
, check_processor_compat
, &c
, 1);
4732 r
= cpuhp_setup_state_nocalls(CPUHP_AP_KVM_STARTING
, "kvm/cpu:starting",
4733 kvm_starting_cpu
, kvm_dying_cpu
);
4736 register_reboot_notifier(&kvm_reboot_notifier
);
4738 /* A kmem cache lets us meet the alignment requirements of fx_save. */
4740 vcpu_align
= __alignof__(struct kvm_vcpu
);
4742 kmem_cache_create_usercopy("kvm_vcpu", vcpu_size
, vcpu_align
,
4744 offsetof(struct kvm_vcpu
, arch
),
4745 sizeof_field(struct kvm_vcpu
, arch
),
4747 if (!kvm_vcpu_cache
) {
4752 r
= kvm_async_pf_init();
4756 kvm_chardev_ops
.owner
= module
;
4757 kvm_vm_fops
.owner
= module
;
4758 kvm_vcpu_fops
.owner
= module
;
4760 r
= misc_register(&kvm_dev
);
4762 pr_err("kvm: misc device register failed\n");
4766 register_syscore_ops(&kvm_syscore_ops
);
4768 kvm_preempt_ops
.sched_in
= kvm_sched_in
;
4769 kvm_preempt_ops
.sched_out
= kvm_sched_out
;
4773 r
= kvm_vfio_ops_init();
4779 kvm_async_pf_deinit();
4781 kmem_cache_destroy(kvm_vcpu_cache
);
4783 unregister_reboot_notifier(&kvm_reboot_notifier
);
4784 cpuhp_remove_state_nocalls(CPUHP_AP_KVM_STARTING
);
4786 kvm_arch_hardware_unsetup();
4788 free_cpumask_var(cpus_hardware_enabled
);
4796 EXPORT_SYMBOL_GPL(kvm_init
);
4800 debugfs_remove_recursive(kvm_debugfs_dir
);
4801 misc_deregister(&kvm_dev
);
4802 kmem_cache_destroy(kvm_vcpu_cache
);
4803 kvm_async_pf_deinit();
4804 unregister_syscore_ops(&kvm_syscore_ops
);
4805 unregister_reboot_notifier(&kvm_reboot_notifier
);
4806 cpuhp_remove_state_nocalls(CPUHP_AP_KVM_STARTING
);
4807 on_each_cpu(hardware_disable_nolock
, NULL
, 1);
4808 kvm_arch_hardware_unsetup();
4811 free_cpumask_var(cpus_hardware_enabled
);
4812 kvm_vfio_ops_exit();
4814 EXPORT_SYMBOL_GPL(kvm_exit
);
4816 struct kvm_vm_worker_thread_context
{
4818 struct task_struct
*parent
;
4819 struct completion init_done
;
4820 kvm_vm_thread_fn_t thread_fn
;
4825 static int kvm_vm_worker_thread(void *context
)
4828 * The init_context is allocated on the stack of the parent thread, so
4829 * we have to locally copy anything that is needed beyond initialization
4831 struct kvm_vm_worker_thread_context
*init_context
= context
;
4832 struct kvm
*kvm
= init_context
->kvm
;
4833 kvm_vm_thread_fn_t thread_fn
= init_context
->thread_fn
;
4834 uintptr_t data
= init_context
->data
;
4837 err
= kthread_park(current
);
4838 /* kthread_park(current) is never supposed to return an error */
4843 err
= cgroup_attach_task_all(init_context
->parent
, current
);
4845 kvm_err("%s: cgroup_attach_task_all failed with err %d\n",
4850 set_user_nice(current
, task_nice(init_context
->parent
));
4853 init_context
->err
= err
;
4854 complete(&init_context
->init_done
);
4855 init_context
= NULL
;
4860 /* Wait to be woken up by the spawner before proceeding. */
4863 if (!kthread_should_stop())
4864 err
= thread_fn(kvm
, data
);
4869 int kvm_vm_create_worker_thread(struct kvm
*kvm
, kvm_vm_thread_fn_t thread_fn
,
4870 uintptr_t data
, const char *name
,
4871 struct task_struct
**thread_ptr
)
4873 struct kvm_vm_worker_thread_context init_context
= {};
4874 struct task_struct
*thread
;
4877 init_context
.kvm
= kvm
;
4878 init_context
.parent
= current
;
4879 init_context
.thread_fn
= thread_fn
;
4880 init_context
.data
= data
;
4881 init_completion(&init_context
.init_done
);
4883 thread
= kthread_run(kvm_vm_worker_thread
, &init_context
,
4884 "%s-%d", name
, task_pid_nr(current
));
4886 return PTR_ERR(thread
);
4888 /* kthread_run is never supposed to return NULL */
4889 WARN_ON(thread
== NULL
);
4891 wait_for_completion(&init_context
.init_done
);
4893 if (!init_context
.err
)
4894 *thread_ptr
= thread
;
4896 return init_context
.err
;