2 * Kernel-based Virtual Machine driver for Linux
4 * This module enables machines with Intel VT-x extensions to run virtual
5 * machines without emulation or binary translation.
7 * Copyright (C) 2006 Qumranet, Inc.
8 * Copyright 2010 Red Hat, Inc. and/or its affiliates.
11 * Avi Kivity <avi@qumranet.com>
12 * Yaniv Kamay <yaniv@qumranet.com>
14 * This work is licensed under the terms of the GNU GPL, version 2. See
15 * the COPYING file in the top-level directory.
19 #include <kvm/iodev.h>
21 #include <linux/kvm_host.h>
22 #include <linux/kvm.h>
23 #include <linux/module.h>
24 #include <linux/errno.h>
25 #include <linux/percpu.h>
27 #include <linux/miscdevice.h>
28 #include <linux/vmalloc.h>
29 #include <linux/reboot.h>
30 #include <linux/debugfs.h>
31 #include <linux/highmem.h>
32 #include <linux/file.h>
33 #include <linux/syscore_ops.h>
34 #include <linux/cpu.h>
35 #include <linux/sched.h>
36 #include <linux/cpumask.h>
37 #include <linux/smp.h>
38 #include <linux/anon_inodes.h>
39 #include <linux/profile.h>
40 #include <linux/kvm_para.h>
41 #include <linux/pagemap.h>
42 #include <linux/mman.h>
43 #include <linux/swap.h>
44 #include <linux/bitops.h>
45 #include <linux/spinlock.h>
46 #include <linux/compat.h>
47 #include <linux/srcu.h>
48 #include <linux/hugetlb.h>
49 #include <linux/slab.h>
50 #include <linux/sort.h>
51 #include <linux/bsearch.h>
53 #include <asm/processor.h>
55 #include <asm/ioctl.h>
56 #include <asm/uaccess.h>
57 #include <asm/pgtable.h>
59 #include "coalesced_mmio.h"
63 #define CREATE_TRACE_POINTS
64 #include <trace/events/kvm.h>
66 MODULE_AUTHOR("Qumranet");
67 MODULE_LICENSE("GPL");
69 /* Architectures should define their poll value according to the halt latency */
70 static unsigned int halt_poll_ns
= KVM_HALT_POLL_NS_DEFAULT
;
71 module_param(halt_poll_ns
, uint
, S_IRUGO
| S_IWUSR
);
73 /* Default doubles per-vcpu halt_poll_ns. */
74 static unsigned int halt_poll_ns_grow
= 2;
75 module_param(halt_poll_ns_grow
, uint
, S_IRUGO
| S_IWUSR
);
77 /* Default resets per-vcpu halt_poll_ns . */
78 static unsigned int halt_poll_ns_shrink
;
79 module_param(halt_poll_ns_shrink
, uint
, S_IRUGO
| S_IWUSR
);
84 * kvm->lock --> kvm->slots_lock --> kvm->irq_lock
87 DEFINE_SPINLOCK(kvm_lock
);
88 static DEFINE_RAW_SPINLOCK(kvm_count_lock
);
91 static cpumask_var_t cpus_hardware_enabled
;
92 static int kvm_usage_count
;
93 static atomic_t hardware_enable_failed
;
95 struct kmem_cache
*kvm_vcpu_cache
;
96 EXPORT_SYMBOL_GPL(kvm_vcpu_cache
);
98 static __read_mostly
struct preempt_ops kvm_preempt_ops
;
100 struct dentry
*kvm_debugfs_dir
;
101 EXPORT_SYMBOL_GPL(kvm_debugfs_dir
);
103 static long kvm_vcpu_ioctl(struct file
*file
, unsigned int ioctl
,
105 #ifdef CONFIG_KVM_COMPAT
106 static long kvm_vcpu_compat_ioctl(struct file
*file
, unsigned int ioctl
,
109 static int hardware_enable_all(void);
110 static void hardware_disable_all(void);
112 static void kvm_io_bus_destroy(struct kvm_io_bus
*bus
);
114 static void kvm_release_pfn_dirty(kvm_pfn_t pfn
);
115 static void mark_page_dirty_in_slot(struct kvm_memory_slot
*memslot
, gfn_t gfn
);
117 __visible
bool kvm_rebooting
;
118 EXPORT_SYMBOL_GPL(kvm_rebooting
);
120 static bool largepages_enabled
= true;
122 bool kvm_is_reserved_pfn(kvm_pfn_t pfn
)
125 return PageReserved(pfn_to_page(pfn
));
131 * Switches to specified vcpu, until a matching vcpu_put()
133 int vcpu_load(struct kvm_vcpu
*vcpu
)
137 if (mutex_lock_killable(&vcpu
->mutex
))
140 preempt_notifier_register(&vcpu
->preempt_notifier
);
141 kvm_arch_vcpu_load(vcpu
, cpu
);
146 void vcpu_put(struct kvm_vcpu
*vcpu
)
149 kvm_arch_vcpu_put(vcpu
);
150 preempt_notifier_unregister(&vcpu
->preempt_notifier
);
152 mutex_unlock(&vcpu
->mutex
);
155 static void ack_flush(void *_completed
)
159 bool kvm_make_all_cpus_request(struct kvm
*kvm
, unsigned int req
)
164 struct kvm_vcpu
*vcpu
;
166 zalloc_cpumask_var(&cpus
, GFP_ATOMIC
);
169 kvm_for_each_vcpu(i
, vcpu
, kvm
) {
170 kvm_make_request(req
, vcpu
);
173 /* Set ->requests bit before we read ->mode */
176 if (cpus
!= NULL
&& cpu
!= -1 && cpu
!= me
&&
177 kvm_vcpu_exiting_guest_mode(vcpu
) != OUTSIDE_GUEST_MODE
)
178 cpumask_set_cpu(cpu
, cpus
);
180 if (unlikely(cpus
== NULL
))
181 smp_call_function_many(cpu_online_mask
, ack_flush
, NULL
, 1);
182 else if (!cpumask_empty(cpus
))
183 smp_call_function_many(cpus
, ack_flush
, NULL
, 1);
187 free_cpumask_var(cpus
);
191 #ifndef CONFIG_HAVE_KVM_ARCH_TLB_FLUSH_ALL
192 void kvm_flush_remote_tlbs(struct kvm
*kvm
)
194 long dirty_count
= kvm
->tlbs_dirty
;
197 if (kvm_make_all_cpus_request(kvm
, KVM_REQ_TLB_FLUSH
))
198 ++kvm
->stat
.remote_tlb_flush
;
199 cmpxchg(&kvm
->tlbs_dirty
, dirty_count
, 0);
201 EXPORT_SYMBOL_GPL(kvm_flush_remote_tlbs
);
204 void kvm_reload_remote_mmus(struct kvm
*kvm
)
206 kvm_make_all_cpus_request(kvm
, KVM_REQ_MMU_RELOAD
);
209 int kvm_vcpu_init(struct kvm_vcpu
*vcpu
, struct kvm
*kvm
, unsigned id
)
214 mutex_init(&vcpu
->mutex
);
219 init_swait_queue_head(&vcpu
->wq
);
220 kvm_async_pf_vcpu_init(vcpu
);
223 INIT_LIST_HEAD(&vcpu
->blocked_vcpu_list
);
225 page
= alloc_page(GFP_KERNEL
| __GFP_ZERO
);
230 vcpu
->run
= page_address(page
);
232 kvm_vcpu_set_in_spin_loop(vcpu
, false);
233 kvm_vcpu_set_dy_eligible(vcpu
, false);
234 vcpu
->preempted
= false;
236 r
= kvm_arch_vcpu_init(vcpu
);
242 free_page((unsigned long)vcpu
->run
);
246 EXPORT_SYMBOL_GPL(kvm_vcpu_init
);
248 void kvm_vcpu_uninit(struct kvm_vcpu
*vcpu
)
251 kvm_arch_vcpu_uninit(vcpu
);
252 free_page((unsigned long)vcpu
->run
);
254 EXPORT_SYMBOL_GPL(kvm_vcpu_uninit
);
256 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
257 static inline struct kvm
*mmu_notifier_to_kvm(struct mmu_notifier
*mn
)
259 return container_of(mn
, struct kvm
, mmu_notifier
);
262 static void kvm_mmu_notifier_invalidate_page(struct mmu_notifier
*mn
,
263 struct mm_struct
*mm
,
264 unsigned long address
)
266 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
267 int need_tlb_flush
, idx
;
270 * When ->invalidate_page runs, the linux pte has been zapped
271 * already but the page is still allocated until
272 * ->invalidate_page returns. So if we increase the sequence
273 * here the kvm page fault will notice if the spte can't be
274 * established because the page is going to be freed. If
275 * instead the kvm page fault establishes the spte before
276 * ->invalidate_page runs, kvm_unmap_hva will release it
279 * The sequence increase only need to be seen at spin_unlock
280 * time, and not at spin_lock time.
282 * Increasing the sequence after the spin_unlock would be
283 * unsafe because the kvm page fault could then establish the
284 * pte after kvm_unmap_hva returned, without noticing the page
285 * is going to be freed.
287 idx
= srcu_read_lock(&kvm
->srcu
);
288 spin_lock(&kvm
->mmu_lock
);
290 kvm
->mmu_notifier_seq
++;
291 need_tlb_flush
= kvm_unmap_hva(kvm
, address
) | kvm
->tlbs_dirty
;
292 /* we've to flush the tlb before the pages can be freed */
294 kvm_flush_remote_tlbs(kvm
);
296 spin_unlock(&kvm
->mmu_lock
);
298 kvm_arch_mmu_notifier_invalidate_page(kvm
, address
);
300 srcu_read_unlock(&kvm
->srcu
, idx
);
303 static void kvm_mmu_notifier_change_pte(struct mmu_notifier
*mn
,
304 struct mm_struct
*mm
,
305 unsigned long address
,
308 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
311 idx
= srcu_read_lock(&kvm
->srcu
);
312 spin_lock(&kvm
->mmu_lock
);
313 kvm
->mmu_notifier_seq
++;
314 kvm_set_spte_hva(kvm
, address
, pte
);
315 spin_unlock(&kvm
->mmu_lock
);
316 srcu_read_unlock(&kvm
->srcu
, idx
);
319 static void kvm_mmu_notifier_invalidate_range_start(struct mmu_notifier
*mn
,
320 struct mm_struct
*mm
,
324 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
325 int need_tlb_flush
= 0, idx
;
327 idx
= srcu_read_lock(&kvm
->srcu
);
328 spin_lock(&kvm
->mmu_lock
);
330 * The count increase must become visible at unlock time as no
331 * spte can be established without taking the mmu_lock and
332 * count is also read inside the mmu_lock critical section.
334 kvm
->mmu_notifier_count
++;
335 need_tlb_flush
= kvm_unmap_hva_range(kvm
, start
, end
);
336 need_tlb_flush
|= kvm
->tlbs_dirty
;
337 /* we've to flush the tlb before the pages can be freed */
339 kvm_flush_remote_tlbs(kvm
);
341 spin_unlock(&kvm
->mmu_lock
);
342 srcu_read_unlock(&kvm
->srcu
, idx
);
345 static void kvm_mmu_notifier_invalidate_range_end(struct mmu_notifier
*mn
,
346 struct mm_struct
*mm
,
350 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
352 spin_lock(&kvm
->mmu_lock
);
354 * This sequence increase will notify the kvm page fault that
355 * the page that is going to be mapped in the spte could have
358 kvm
->mmu_notifier_seq
++;
361 * The above sequence increase must be visible before the
362 * below count decrease, which is ensured by the smp_wmb above
363 * in conjunction with the smp_rmb in mmu_notifier_retry().
365 kvm
->mmu_notifier_count
--;
366 spin_unlock(&kvm
->mmu_lock
);
368 BUG_ON(kvm
->mmu_notifier_count
< 0);
371 static int kvm_mmu_notifier_clear_flush_young(struct mmu_notifier
*mn
,
372 struct mm_struct
*mm
,
376 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
379 idx
= srcu_read_lock(&kvm
->srcu
);
380 spin_lock(&kvm
->mmu_lock
);
382 young
= kvm_age_hva(kvm
, start
, end
);
384 kvm_flush_remote_tlbs(kvm
);
386 spin_unlock(&kvm
->mmu_lock
);
387 srcu_read_unlock(&kvm
->srcu
, idx
);
392 static int kvm_mmu_notifier_clear_young(struct mmu_notifier
*mn
,
393 struct mm_struct
*mm
,
397 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
400 idx
= srcu_read_lock(&kvm
->srcu
);
401 spin_lock(&kvm
->mmu_lock
);
403 * Even though we do not flush TLB, this will still adversely
404 * affect performance on pre-Haswell Intel EPT, where there is
405 * no EPT Access Bit to clear so that we have to tear down EPT
406 * tables instead. If we find this unacceptable, we can always
407 * add a parameter to kvm_age_hva so that it effectively doesn't
408 * do anything on clear_young.
410 * Also note that currently we never issue secondary TLB flushes
411 * from clear_young, leaving this job up to the regular system
412 * cadence. If we find this inaccurate, we might come up with a
413 * more sophisticated heuristic later.
415 young
= kvm_age_hva(kvm
, start
, end
);
416 spin_unlock(&kvm
->mmu_lock
);
417 srcu_read_unlock(&kvm
->srcu
, idx
);
422 static int kvm_mmu_notifier_test_young(struct mmu_notifier
*mn
,
423 struct mm_struct
*mm
,
424 unsigned long address
)
426 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
429 idx
= srcu_read_lock(&kvm
->srcu
);
430 spin_lock(&kvm
->mmu_lock
);
431 young
= kvm_test_age_hva(kvm
, address
);
432 spin_unlock(&kvm
->mmu_lock
);
433 srcu_read_unlock(&kvm
->srcu
, idx
);
438 static void kvm_mmu_notifier_release(struct mmu_notifier
*mn
,
439 struct mm_struct
*mm
)
441 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
444 idx
= srcu_read_lock(&kvm
->srcu
);
445 kvm_arch_flush_shadow_all(kvm
);
446 srcu_read_unlock(&kvm
->srcu
, idx
);
449 static const struct mmu_notifier_ops kvm_mmu_notifier_ops
= {
450 .invalidate_page
= kvm_mmu_notifier_invalidate_page
,
451 .invalidate_range_start
= kvm_mmu_notifier_invalidate_range_start
,
452 .invalidate_range_end
= kvm_mmu_notifier_invalidate_range_end
,
453 .clear_flush_young
= kvm_mmu_notifier_clear_flush_young
,
454 .clear_young
= kvm_mmu_notifier_clear_young
,
455 .test_young
= kvm_mmu_notifier_test_young
,
456 .change_pte
= kvm_mmu_notifier_change_pte
,
457 .release
= kvm_mmu_notifier_release
,
460 static int kvm_init_mmu_notifier(struct kvm
*kvm
)
462 kvm
->mmu_notifier
.ops
= &kvm_mmu_notifier_ops
;
463 return mmu_notifier_register(&kvm
->mmu_notifier
, current
->mm
);
466 #else /* !(CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER) */
468 static int kvm_init_mmu_notifier(struct kvm
*kvm
)
473 #endif /* CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER */
475 static struct kvm_memslots
*kvm_alloc_memslots(void)
478 struct kvm_memslots
*slots
;
480 slots
= kvm_kvzalloc(sizeof(struct kvm_memslots
));
485 * Init kvm generation close to the maximum to easily test the
486 * code of handling generation number wrap-around.
488 slots
->generation
= -150;
489 for (i
= 0; i
< KVM_MEM_SLOTS_NUM
; i
++)
490 slots
->id_to_index
[i
] = slots
->memslots
[i
].id
= i
;
495 static void kvm_destroy_dirty_bitmap(struct kvm_memory_slot
*memslot
)
497 if (!memslot
->dirty_bitmap
)
500 kvfree(memslot
->dirty_bitmap
);
501 memslot
->dirty_bitmap
= NULL
;
505 * Free any memory in @free but not in @dont.
507 static void kvm_free_memslot(struct kvm
*kvm
, struct kvm_memory_slot
*free
,
508 struct kvm_memory_slot
*dont
)
510 if (!dont
|| free
->dirty_bitmap
!= dont
->dirty_bitmap
)
511 kvm_destroy_dirty_bitmap(free
);
513 kvm_arch_free_memslot(kvm
, free
, dont
);
518 static void kvm_free_memslots(struct kvm
*kvm
, struct kvm_memslots
*slots
)
520 struct kvm_memory_slot
*memslot
;
525 kvm_for_each_memslot(memslot
, slots
)
526 kvm_free_memslot(kvm
, memslot
, NULL
);
531 static struct kvm
*kvm_create_vm(unsigned long type
)
534 struct kvm
*kvm
= kvm_arch_alloc_vm();
537 return ERR_PTR(-ENOMEM
);
539 r
= kvm_arch_init_vm(kvm
, type
);
541 goto out_err_no_disable
;
543 r
= hardware_enable_all();
545 goto out_err_no_disable
;
547 #ifdef CONFIG_HAVE_KVM_IRQFD
548 INIT_HLIST_HEAD(&kvm
->irq_ack_notifier_list
);
551 BUILD_BUG_ON(KVM_MEM_SLOTS_NUM
> SHRT_MAX
);
554 for (i
= 0; i
< KVM_ADDRESS_SPACE_NUM
; i
++) {
555 kvm
->memslots
[i
] = kvm_alloc_memslots();
556 if (!kvm
->memslots
[i
])
557 goto out_err_no_srcu
;
560 if (init_srcu_struct(&kvm
->srcu
))
561 goto out_err_no_srcu
;
562 if (init_srcu_struct(&kvm
->irq_srcu
))
563 goto out_err_no_irq_srcu
;
564 for (i
= 0; i
< KVM_NR_BUSES
; i
++) {
565 kvm
->buses
[i
] = kzalloc(sizeof(struct kvm_io_bus
),
571 spin_lock_init(&kvm
->mmu_lock
);
572 kvm
->mm
= current
->mm
;
573 atomic_inc(&kvm
->mm
->mm_count
);
574 kvm_eventfd_init(kvm
);
575 mutex_init(&kvm
->lock
);
576 mutex_init(&kvm
->irq_lock
);
577 mutex_init(&kvm
->slots_lock
);
578 atomic_set(&kvm
->users_count
, 1);
579 INIT_LIST_HEAD(&kvm
->devices
);
581 r
= kvm_init_mmu_notifier(kvm
);
585 spin_lock(&kvm_lock
);
586 list_add(&kvm
->vm_list
, &vm_list
);
587 spin_unlock(&kvm_lock
);
589 preempt_notifier_inc();
594 cleanup_srcu_struct(&kvm
->irq_srcu
);
596 cleanup_srcu_struct(&kvm
->srcu
);
598 hardware_disable_all();
600 for (i
= 0; i
< KVM_NR_BUSES
; i
++)
601 kfree(kvm
->buses
[i
]);
602 for (i
= 0; i
< KVM_ADDRESS_SPACE_NUM
; i
++)
603 kvm_free_memslots(kvm
, kvm
->memslots
[i
]);
604 kvm_arch_free_vm(kvm
);
609 * Avoid using vmalloc for a small buffer.
610 * Should not be used when the size is statically known.
612 void *kvm_kvzalloc(unsigned long size
)
614 if (size
> PAGE_SIZE
)
615 return vzalloc(size
);
617 return kzalloc(size
, GFP_KERNEL
);
620 static void kvm_destroy_devices(struct kvm
*kvm
)
622 struct kvm_device
*dev
, *tmp
;
624 list_for_each_entry_safe(dev
, tmp
, &kvm
->devices
, vm_node
) {
625 list_del(&dev
->vm_node
);
626 dev
->ops
->destroy(dev
);
630 static void kvm_destroy_vm(struct kvm
*kvm
)
633 struct mm_struct
*mm
= kvm
->mm
;
635 kvm_arch_sync_events(kvm
);
636 spin_lock(&kvm_lock
);
637 list_del(&kvm
->vm_list
);
638 spin_unlock(&kvm_lock
);
639 kvm_free_irq_routing(kvm
);
640 for (i
= 0; i
< KVM_NR_BUSES
; i
++)
641 kvm_io_bus_destroy(kvm
->buses
[i
]);
642 kvm_coalesced_mmio_free(kvm
);
643 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
644 mmu_notifier_unregister(&kvm
->mmu_notifier
, kvm
->mm
);
646 kvm_arch_flush_shadow_all(kvm
);
648 kvm_arch_destroy_vm(kvm
);
649 kvm_destroy_devices(kvm
);
650 for (i
= 0; i
< KVM_ADDRESS_SPACE_NUM
; i
++)
651 kvm_free_memslots(kvm
, kvm
->memslots
[i
]);
652 cleanup_srcu_struct(&kvm
->irq_srcu
);
653 cleanup_srcu_struct(&kvm
->srcu
);
654 kvm_arch_free_vm(kvm
);
655 preempt_notifier_dec();
656 hardware_disable_all();
660 void kvm_get_kvm(struct kvm
*kvm
)
662 atomic_inc(&kvm
->users_count
);
664 EXPORT_SYMBOL_GPL(kvm_get_kvm
);
666 void kvm_put_kvm(struct kvm
*kvm
)
668 if (atomic_dec_and_test(&kvm
->users_count
))
671 EXPORT_SYMBOL_GPL(kvm_put_kvm
);
674 static int kvm_vm_release(struct inode
*inode
, struct file
*filp
)
676 struct kvm
*kvm
= filp
->private_data
;
678 kvm_irqfd_release(kvm
);
685 * Allocation size is twice as large as the actual dirty bitmap size.
686 * See x86's kvm_vm_ioctl_get_dirty_log() why this is needed.
688 static int kvm_create_dirty_bitmap(struct kvm_memory_slot
*memslot
)
690 unsigned long dirty_bytes
= 2 * kvm_dirty_bitmap_bytes(memslot
);
692 memslot
->dirty_bitmap
= kvm_kvzalloc(dirty_bytes
);
693 if (!memslot
->dirty_bitmap
)
700 * Insert memslot and re-sort memslots based on their GFN,
701 * so binary search could be used to lookup GFN.
702 * Sorting algorithm takes advantage of having initially
703 * sorted array and known changed memslot position.
705 static void update_memslots(struct kvm_memslots
*slots
,
706 struct kvm_memory_slot
*new)
709 int i
= slots
->id_to_index
[id
];
710 struct kvm_memory_slot
*mslots
= slots
->memslots
;
712 WARN_ON(mslots
[i
].id
!= id
);
714 WARN_ON(!mslots
[i
].npages
);
715 if (mslots
[i
].npages
)
718 if (!mslots
[i
].npages
)
722 while (i
< KVM_MEM_SLOTS_NUM
- 1 &&
723 new->base_gfn
<= mslots
[i
+ 1].base_gfn
) {
724 if (!mslots
[i
+ 1].npages
)
726 mslots
[i
] = mslots
[i
+ 1];
727 slots
->id_to_index
[mslots
[i
].id
] = i
;
732 * The ">=" is needed when creating a slot with base_gfn == 0,
733 * so that it moves before all those with base_gfn == npages == 0.
735 * On the other hand, if new->npages is zero, the above loop has
736 * already left i pointing to the beginning of the empty part of
737 * mslots, and the ">=" would move the hole backwards in this
738 * case---which is wrong. So skip the loop when deleting a slot.
742 new->base_gfn
>= mslots
[i
- 1].base_gfn
) {
743 mslots
[i
] = mslots
[i
- 1];
744 slots
->id_to_index
[mslots
[i
].id
] = i
;
748 WARN_ON_ONCE(i
!= slots
->used_slots
);
751 slots
->id_to_index
[mslots
[i
].id
] = i
;
754 static int check_memory_region_flags(const struct kvm_userspace_memory_region
*mem
)
756 u32 valid_flags
= KVM_MEM_LOG_DIRTY_PAGES
;
758 #ifdef __KVM_HAVE_READONLY_MEM
759 valid_flags
|= KVM_MEM_READONLY
;
762 if (mem
->flags
& ~valid_flags
)
768 static struct kvm_memslots
*install_new_memslots(struct kvm
*kvm
,
769 int as_id
, struct kvm_memslots
*slots
)
771 struct kvm_memslots
*old_memslots
= __kvm_memslots(kvm
, as_id
);
774 * Set the low bit in the generation, which disables SPTE caching
775 * until the end of synchronize_srcu_expedited.
777 WARN_ON(old_memslots
->generation
& 1);
778 slots
->generation
= old_memslots
->generation
+ 1;
780 rcu_assign_pointer(kvm
->memslots
[as_id
], slots
);
781 synchronize_srcu_expedited(&kvm
->srcu
);
784 * Increment the new memslot generation a second time. This prevents
785 * vm exits that race with memslot updates from caching a memslot
786 * generation that will (potentially) be valid forever.
790 kvm_arch_memslots_updated(kvm
, slots
);
796 * Allocate some memory and give it an address in the guest physical address
799 * Discontiguous memory is allowed, mostly for framebuffers.
801 * Must be called holding kvm->slots_lock for write.
803 int __kvm_set_memory_region(struct kvm
*kvm
,
804 const struct kvm_userspace_memory_region
*mem
)
808 unsigned long npages
;
809 struct kvm_memory_slot
*slot
;
810 struct kvm_memory_slot old
, new;
811 struct kvm_memslots
*slots
= NULL
, *old_memslots
;
813 enum kvm_mr_change change
;
815 r
= check_memory_region_flags(mem
);
820 as_id
= mem
->slot
>> 16;
823 /* General sanity checks */
824 if (mem
->memory_size
& (PAGE_SIZE
- 1))
826 if (mem
->guest_phys_addr
& (PAGE_SIZE
- 1))
828 /* We can read the guest memory with __xxx_user() later on. */
829 if ((id
< KVM_USER_MEM_SLOTS
) &&
830 ((mem
->userspace_addr
& (PAGE_SIZE
- 1)) ||
831 !access_ok(VERIFY_WRITE
,
832 (void __user
*)(unsigned long)mem
->userspace_addr
,
835 if (as_id
>= KVM_ADDRESS_SPACE_NUM
|| id
>= KVM_MEM_SLOTS_NUM
)
837 if (mem
->guest_phys_addr
+ mem
->memory_size
< mem
->guest_phys_addr
)
840 slot
= id_to_memslot(__kvm_memslots(kvm
, as_id
), id
);
841 base_gfn
= mem
->guest_phys_addr
>> PAGE_SHIFT
;
842 npages
= mem
->memory_size
>> PAGE_SHIFT
;
844 if (npages
> KVM_MEM_MAX_NR_PAGES
)
850 new.base_gfn
= base_gfn
;
852 new.flags
= mem
->flags
;
856 change
= KVM_MR_CREATE
;
857 else { /* Modify an existing slot. */
858 if ((mem
->userspace_addr
!= old
.userspace_addr
) ||
859 (npages
!= old
.npages
) ||
860 ((new.flags
^ old
.flags
) & KVM_MEM_READONLY
))
863 if (base_gfn
!= old
.base_gfn
)
864 change
= KVM_MR_MOVE
;
865 else if (new.flags
!= old
.flags
)
866 change
= KVM_MR_FLAGS_ONLY
;
867 else { /* Nothing to change. */
876 change
= KVM_MR_DELETE
;
881 if ((change
== KVM_MR_CREATE
) || (change
== KVM_MR_MOVE
)) {
882 /* Check for overlaps */
884 kvm_for_each_memslot(slot
, __kvm_memslots(kvm
, as_id
)) {
885 if ((slot
->id
>= KVM_USER_MEM_SLOTS
) ||
888 if (!((base_gfn
+ npages
<= slot
->base_gfn
) ||
889 (base_gfn
>= slot
->base_gfn
+ slot
->npages
)))
894 /* Free page dirty bitmap if unneeded */
895 if (!(new.flags
& KVM_MEM_LOG_DIRTY_PAGES
))
896 new.dirty_bitmap
= NULL
;
899 if (change
== KVM_MR_CREATE
) {
900 new.userspace_addr
= mem
->userspace_addr
;
902 if (kvm_arch_create_memslot(kvm
, &new, npages
))
906 /* Allocate page dirty bitmap if needed */
907 if ((new.flags
& KVM_MEM_LOG_DIRTY_PAGES
) && !new.dirty_bitmap
) {
908 if (kvm_create_dirty_bitmap(&new) < 0)
912 slots
= kvm_kvzalloc(sizeof(struct kvm_memslots
));
915 memcpy(slots
, __kvm_memslots(kvm
, as_id
), sizeof(struct kvm_memslots
));
917 if ((change
== KVM_MR_DELETE
) || (change
== KVM_MR_MOVE
)) {
918 slot
= id_to_memslot(slots
, id
);
919 slot
->flags
|= KVM_MEMSLOT_INVALID
;
921 old_memslots
= install_new_memslots(kvm
, as_id
, slots
);
923 /* slot was deleted or moved, clear iommu mapping */
924 kvm_iommu_unmap_pages(kvm
, &old
);
925 /* From this point no new shadow pages pointing to a deleted,
926 * or moved, memslot will be created.
928 * validation of sp->gfn happens in:
929 * - gfn_to_hva (kvm_read_guest, gfn_to_pfn)
930 * - kvm_is_visible_gfn (mmu_check_roots)
932 kvm_arch_flush_shadow_memslot(kvm
, slot
);
935 * We can re-use the old_memslots from above, the only difference
936 * from the currently installed memslots is the invalid flag. This
937 * will get overwritten by update_memslots anyway.
939 slots
= old_memslots
;
942 r
= kvm_arch_prepare_memory_region(kvm
, &new, mem
, change
);
946 /* actual memory is freed via old in kvm_free_memslot below */
947 if (change
== KVM_MR_DELETE
) {
948 new.dirty_bitmap
= NULL
;
949 memset(&new.arch
, 0, sizeof(new.arch
));
952 update_memslots(slots
, &new);
953 old_memslots
= install_new_memslots(kvm
, as_id
, slots
);
955 kvm_arch_commit_memory_region(kvm
, mem
, &old
, &new, change
);
957 kvm_free_memslot(kvm
, &old
, &new);
958 kvfree(old_memslots
);
961 * IOMMU mapping: New slots need to be mapped. Old slots need to be
962 * un-mapped and re-mapped if their base changes. Since base change
963 * unmapping is handled above with slot deletion, mapping alone is
964 * needed here. Anything else the iommu might care about for existing
965 * slots (size changes, userspace addr changes and read-only flag
966 * changes) is disallowed above, so any other attribute changes getting
967 * here can be skipped.
969 if ((change
== KVM_MR_CREATE
) || (change
== KVM_MR_MOVE
)) {
970 r
= kvm_iommu_map_pages(kvm
, &new);
979 kvm_free_memslot(kvm
, &new, &old
);
983 EXPORT_SYMBOL_GPL(__kvm_set_memory_region
);
985 int kvm_set_memory_region(struct kvm
*kvm
,
986 const struct kvm_userspace_memory_region
*mem
)
990 mutex_lock(&kvm
->slots_lock
);
991 r
= __kvm_set_memory_region(kvm
, mem
);
992 mutex_unlock(&kvm
->slots_lock
);
995 EXPORT_SYMBOL_GPL(kvm_set_memory_region
);
997 static int kvm_vm_ioctl_set_memory_region(struct kvm
*kvm
,
998 struct kvm_userspace_memory_region
*mem
)
1000 if ((u16
)mem
->slot
>= KVM_USER_MEM_SLOTS
)
1003 return kvm_set_memory_region(kvm
, mem
);
1006 int kvm_get_dirty_log(struct kvm
*kvm
,
1007 struct kvm_dirty_log
*log
, int *is_dirty
)
1009 struct kvm_memslots
*slots
;
1010 struct kvm_memory_slot
*memslot
;
1011 int r
, i
, as_id
, id
;
1013 unsigned long any
= 0;
1016 as_id
= log
->slot
>> 16;
1017 id
= (u16
)log
->slot
;
1018 if (as_id
>= KVM_ADDRESS_SPACE_NUM
|| id
>= KVM_USER_MEM_SLOTS
)
1021 slots
= __kvm_memslots(kvm
, as_id
);
1022 memslot
= id_to_memslot(slots
, id
);
1024 if (!memslot
->dirty_bitmap
)
1027 n
= kvm_dirty_bitmap_bytes(memslot
);
1029 for (i
= 0; !any
&& i
< n
/sizeof(long); ++i
)
1030 any
= memslot
->dirty_bitmap
[i
];
1033 if (copy_to_user(log
->dirty_bitmap
, memslot
->dirty_bitmap
, n
))
1043 EXPORT_SYMBOL_GPL(kvm_get_dirty_log
);
1045 #ifdef CONFIG_KVM_GENERIC_DIRTYLOG_READ_PROTECT
1047 * kvm_get_dirty_log_protect - get a snapshot of dirty pages, and if any pages
1048 * are dirty write protect them for next write.
1049 * @kvm: pointer to kvm instance
1050 * @log: slot id and address to which we copy the log
1051 * @is_dirty: flag set if any page is dirty
1053 * We need to keep it in mind that VCPU threads can write to the bitmap
1054 * concurrently. So, to avoid losing track of dirty pages we keep the
1057 * 1. Take a snapshot of the bit and clear it if needed.
1058 * 2. Write protect the corresponding page.
1059 * 3. Copy the snapshot to the userspace.
1060 * 4. Upon return caller flushes TLB's if needed.
1062 * Between 2 and 4, the guest may write to the page using the remaining TLB
1063 * entry. This is not a problem because the page is reported dirty using
1064 * the snapshot taken before and step 4 ensures that writes done after
1065 * exiting to userspace will be logged for the next call.
1068 int kvm_get_dirty_log_protect(struct kvm
*kvm
,
1069 struct kvm_dirty_log
*log
, bool *is_dirty
)
1071 struct kvm_memslots
*slots
;
1072 struct kvm_memory_slot
*memslot
;
1073 int r
, i
, as_id
, id
;
1075 unsigned long *dirty_bitmap
;
1076 unsigned long *dirty_bitmap_buffer
;
1079 as_id
= log
->slot
>> 16;
1080 id
= (u16
)log
->slot
;
1081 if (as_id
>= KVM_ADDRESS_SPACE_NUM
|| id
>= KVM_USER_MEM_SLOTS
)
1084 slots
= __kvm_memslots(kvm
, as_id
);
1085 memslot
= id_to_memslot(slots
, id
);
1087 dirty_bitmap
= memslot
->dirty_bitmap
;
1092 n
= kvm_dirty_bitmap_bytes(memslot
);
1094 dirty_bitmap_buffer
= dirty_bitmap
+ n
/ sizeof(long);
1095 memset(dirty_bitmap_buffer
, 0, n
);
1097 spin_lock(&kvm
->mmu_lock
);
1099 for (i
= 0; i
< n
/ sizeof(long); i
++) {
1103 if (!dirty_bitmap
[i
])
1108 mask
= xchg(&dirty_bitmap
[i
], 0);
1109 dirty_bitmap_buffer
[i
] = mask
;
1112 offset
= i
* BITS_PER_LONG
;
1113 kvm_arch_mmu_enable_log_dirty_pt_masked(kvm
, memslot
,
1118 spin_unlock(&kvm
->mmu_lock
);
1121 if (copy_to_user(log
->dirty_bitmap
, dirty_bitmap_buffer
, n
))
1128 EXPORT_SYMBOL_GPL(kvm_get_dirty_log_protect
);
1131 bool kvm_largepages_enabled(void)
1133 return largepages_enabled
;
1136 void kvm_disable_largepages(void)
1138 largepages_enabled
= false;
1140 EXPORT_SYMBOL_GPL(kvm_disable_largepages
);
1142 struct kvm_memory_slot
*gfn_to_memslot(struct kvm
*kvm
, gfn_t gfn
)
1144 return __gfn_to_memslot(kvm_memslots(kvm
), gfn
);
1146 EXPORT_SYMBOL_GPL(gfn_to_memslot
);
1148 struct kvm_memory_slot
*kvm_vcpu_gfn_to_memslot(struct kvm_vcpu
*vcpu
, gfn_t gfn
)
1150 return __gfn_to_memslot(kvm_vcpu_memslots(vcpu
), gfn
);
1153 bool kvm_is_visible_gfn(struct kvm
*kvm
, gfn_t gfn
)
1155 struct kvm_memory_slot
*memslot
= gfn_to_memslot(kvm
, gfn
);
1157 if (!memslot
|| memslot
->id
>= KVM_USER_MEM_SLOTS
||
1158 memslot
->flags
& KVM_MEMSLOT_INVALID
)
1163 EXPORT_SYMBOL_GPL(kvm_is_visible_gfn
);
1165 unsigned long kvm_host_page_size(struct kvm
*kvm
, gfn_t gfn
)
1167 struct vm_area_struct
*vma
;
1168 unsigned long addr
, size
;
1172 addr
= gfn_to_hva(kvm
, gfn
);
1173 if (kvm_is_error_hva(addr
))
1176 down_read(¤t
->mm
->mmap_sem
);
1177 vma
= find_vma(current
->mm
, addr
);
1181 size
= vma_kernel_pagesize(vma
);
1184 up_read(¤t
->mm
->mmap_sem
);
1189 static bool memslot_is_readonly(struct kvm_memory_slot
*slot
)
1191 return slot
->flags
& KVM_MEM_READONLY
;
1194 static unsigned long __gfn_to_hva_many(struct kvm_memory_slot
*slot
, gfn_t gfn
,
1195 gfn_t
*nr_pages
, bool write
)
1197 if (!slot
|| slot
->flags
& KVM_MEMSLOT_INVALID
)
1198 return KVM_HVA_ERR_BAD
;
1200 if (memslot_is_readonly(slot
) && write
)
1201 return KVM_HVA_ERR_RO_BAD
;
1204 *nr_pages
= slot
->npages
- (gfn
- slot
->base_gfn
);
1206 return __gfn_to_hva_memslot(slot
, gfn
);
1209 static unsigned long gfn_to_hva_many(struct kvm_memory_slot
*slot
, gfn_t gfn
,
1212 return __gfn_to_hva_many(slot
, gfn
, nr_pages
, true);
1215 unsigned long gfn_to_hva_memslot(struct kvm_memory_slot
*slot
,
1218 return gfn_to_hva_many(slot
, gfn
, NULL
);
1220 EXPORT_SYMBOL_GPL(gfn_to_hva_memslot
);
1222 unsigned long gfn_to_hva(struct kvm
*kvm
, gfn_t gfn
)
1224 return gfn_to_hva_many(gfn_to_memslot(kvm
, gfn
), gfn
, NULL
);
1226 EXPORT_SYMBOL_GPL(gfn_to_hva
);
1228 unsigned long kvm_vcpu_gfn_to_hva(struct kvm_vcpu
*vcpu
, gfn_t gfn
)
1230 return gfn_to_hva_many(kvm_vcpu_gfn_to_memslot(vcpu
, gfn
), gfn
, NULL
);
1232 EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_hva
);
1235 * If writable is set to false, the hva returned by this function is only
1236 * allowed to be read.
1238 unsigned long gfn_to_hva_memslot_prot(struct kvm_memory_slot
*slot
,
1239 gfn_t gfn
, bool *writable
)
1241 unsigned long hva
= __gfn_to_hva_many(slot
, gfn
, NULL
, false);
1243 if (!kvm_is_error_hva(hva
) && writable
)
1244 *writable
= !memslot_is_readonly(slot
);
1249 unsigned long gfn_to_hva_prot(struct kvm
*kvm
, gfn_t gfn
, bool *writable
)
1251 struct kvm_memory_slot
*slot
= gfn_to_memslot(kvm
, gfn
);
1253 return gfn_to_hva_memslot_prot(slot
, gfn
, writable
);
1256 unsigned long kvm_vcpu_gfn_to_hva_prot(struct kvm_vcpu
*vcpu
, gfn_t gfn
, bool *writable
)
1258 struct kvm_memory_slot
*slot
= kvm_vcpu_gfn_to_memslot(vcpu
, gfn
);
1260 return gfn_to_hva_memslot_prot(slot
, gfn
, writable
);
1263 static int get_user_page_nowait(struct task_struct
*tsk
, struct mm_struct
*mm
,
1264 unsigned long start
, int write
, struct page
**page
)
1266 int flags
= FOLL_TOUCH
| FOLL_NOWAIT
| FOLL_HWPOISON
| FOLL_GET
;
1269 flags
|= FOLL_WRITE
;
1271 return __get_user_pages(tsk
, mm
, start
, 1, flags
, page
, NULL
, NULL
);
1274 static inline int check_user_page_hwpoison(unsigned long addr
)
1276 int rc
, flags
= FOLL_TOUCH
| FOLL_HWPOISON
| FOLL_WRITE
;
1278 rc
= __get_user_pages(current
, current
->mm
, addr
, 1,
1279 flags
, NULL
, NULL
, NULL
);
1280 return rc
== -EHWPOISON
;
1284 * The atomic path to get the writable pfn which will be stored in @pfn,
1285 * true indicates success, otherwise false is returned.
1287 static bool hva_to_pfn_fast(unsigned long addr
, bool atomic
, bool *async
,
1288 bool write_fault
, bool *writable
, kvm_pfn_t
*pfn
)
1290 struct page
*page
[1];
1293 if (!(async
|| atomic
))
1297 * Fast pin a writable pfn only if it is a write fault request
1298 * or the caller allows to map a writable pfn for a read fault
1301 if (!(write_fault
|| writable
))
1304 npages
= __get_user_pages_fast(addr
, 1, 1, page
);
1306 *pfn
= page_to_pfn(page
[0]);
1317 * The slow path to get the pfn of the specified host virtual address,
1318 * 1 indicates success, -errno is returned if error is detected.
1320 static int hva_to_pfn_slow(unsigned long addr
, bool *async
, bool write_fault
,
1321 bool *writable
, kvm_pfn_t
*pfn
)
1323 struct page
*page
[1];
1329 *writable
= write_fault
;
1332 down_read(¤t
->mm
->mmap_sem
);
1333 npages
= get_user_page_nowait(current
, current
->mm
,
1334 addr
, write_fault
, page
);
1335 up_read(¤t
->mm
->mmap_sem
);
1337 npages
= __get_user_pages_unlocked(current
, current
->mm
, addr
, 1,
1338 write_fault
, 0, page
,
1339 FOLL_TOUCH
|FOLL_HWPOISON
);
1343 /* map read fault as writable if possible */
1344 if (unlikely(!write_fault
) && writable
) {
1345 struct page
*wpage
[1];
1347 npages
= __get_user_pages_fast(addr
, 1, 1, wpage
);
1356 *pfn
= page_to_pfn(page
[0]);
1360 static bool vma_is_valid(struct vm_area_struct
*vma
, bool write_fault
)
1362 if (unlikely(!(vma
->vm_flags
& VM_READ
)))
1365 if (write_fault
&& (unlikely(!(vma
->vm_flags
& VM_WRITE
))))
1372 * Pin guest page in memory and return its pfn.
1373 * @addr: host virtual address which maps memory to the guest
1374 * @atomic: whether this function can sleep
1375 * @async: whether this function need to wait IO complete if the
1376 * host page is not in the memory
1377 * @write_fault: whether we should get a writable host page
1378 * @writable: whether it allows to map a writable host page for !@write_fault
1380 * The function will map a writable host page for these two cases:
1381 * 1): @write_fault = true
1382 * 2): @write_fault = false && @writable, @writable will tell the caller
1383 * whether the mapping is writable.
1385 static kvm_pfn_t
hva_to_pfn(unsigned long addr
, bool atomic
, bool *async
,
1386 bool write_fault
, bool *writable
)
1388 struct vm_area_struct
*vma
;
1392 /* we can do it either atomically or asynchronously, not both */
1393 BUG_ON(atomic
&& async
);
1395 if (hva_to_pfn_fast(addr
, atomic
, async
, write_fault
, writable
, &pfn
))
1399 return KVM_PFN_ERR_FAULT
;
1401 npages
= hva_to_pfn_slow(addr
, async
, write_fault
, writable
, &pfn
);
1405 down_read(¤t
->mm
->mmap_sem
);
1406 if (npages
== -EHWPOISON
||
1407 (!async
&& check_user_page_hwpoison(addr
))) {
1408 pfn
= KVM_PFN_ERR_HWPOISON
;
1412 vma
= find_vma_intersection(current
->mm
, addr
, addr
+ 1);
1415 pfn
= KVM_PFN_ERR_FAULT
;
1416 else if ((vma
->vm_flags
& VM_PFNMAP
)) {
1417 pfn
= ((addr
- vma
->vm_start
) >> PAGE_SHIFT
) +
1419 BUG_ON(!kvm_is_reserved_pfn(pfn
));
1421 if (async
&& vma_is_valid(vma
, write_fault
))
1423 pfn
= KVM_PFN_ERR_FAULT
;
1426 up_read(¤t
->mm
->mmap_sem
);
1430 kvm_pfn_t
__gfn_to_pfn_memslot(struct kvm_memory_slot
*slot
, gfn_t gfn
,
1431 bool atomic
, bool *async
, bool write_fault
,
1434 unsigned long addr
= __gfn_to_hva_many(slot
, gfn
, NULL
, write_fault
);
1436 if (addr
== KVM_HVA_ERR_RO_BAD
) {
1439 return KVM_PFN_ERR_RO_FAULT
;
1442 if (kvm_is_error_hva(addr
)) {
1445 return KVM_PFN_NOSLOT
;
1448 /* Do not map writable pfn in the readonly memslot. */
1449 if (writable
&& memslot_is_readonly(slot
)) {
1454 return hva_to_pfn(addr
, atomic
, async
, write_fault
,
1457 EXPORT_SYMBOL_GPL(__gfn_to_pfn_memslot
);
1459 kvm_pfn_t
gfn_to_pfn_prot(struct kvm
*kvm
, gfn_t gfn
, bool write_fault
,
1462 return __gfn_to_pfn_memslot(gfn_to_memslot(kvm
, gfn
), gfn
, false, NULL
,
1463 write_fault
, writable
);
1465 EXPORT_SYMBOL_GPL(gfn_to_pfn_prot
);
1467 kvm_pfn_t
gfn_to_pfn_memslot(struct kvm_memory_slot
*slot
, gfn_t gfn
)
1469 return __gfn_to_pfn_memslot(slot
, gfn
, false, NULL
, true, NULL
);
1471 EXPORT_SYMBOL_GPL(gfn_to_pfn_memslot
);
1473 kvm_pfn_t
gfn_to_pfn_memslot_atomic(struct kvm_memory_slot
*slot
, gfn_t gfn
)
1475 return __gfn_to_pfn_memslot(slot
, gfn
, true, NULL
, true, NULL
);
1477 EXPORT_SYMBOL_GPL(gfn_to_pfn_memslot_atomic
);
1479 kvm_pfn_t
gfn_to_pfn_atomic(struct kvm
*kvm
, gfn_t gfn
)
1481 return gfn_to_pfn_memslot_atomic(gfn_to_memslot(kvm
, gfn
), gfn
);
1483 EXPORT_SYMBOL_GPL(gfn_to_pfn_atomic
);
1485 kvm_pfn_t
kvm_vcpu_gfn_to_pfn_atomic(struct kvm_vcpu
*vcpu
, gfn_t gfn
)
1487 return gfn_to_pfn_memslot_atomic(kvm_vcpu_gfn_to_memslot(vcpu
, gfn
), gfn
);
1489 EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_pfn_atomic
);
1491 kvm_pfn_t
gfn_to_pfn(struct kvm
*kvm
, gfn_t gfn
)
1493 return gfn_to_pfn_memslot(gfn_to_memslot(kvm
, gfn
), gfn
);
1495 EXPORT_SYMBOL_GPL(gfn_to_pfn
);
1497 kvm_pfn_t
kvm_vcpu_gfn_to_pfn(struct kvm_vcpu
*vcpu
, gfn_t gfn
)
1499 return gfn_to_pfn_memslot(kvm_vcpu_gfn_to_memslot(vcpu
, gfn
), gfn
);
1501 EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_pfn
);
1503 int gfn_to_page_many_atomic(struct kvm_memory_slot
*slot
, gfn_t gfn
,
1504 struct page
**pages
, int nr_pages
)
1509 addr
= gfn_to_hva_many(slot
, gfn
, &entry
);
1510 if (kvm_is_error_hva(addr
))
1513 if (entry
< nr_pages
)
1516 return __get_user_pages_fast(addr
, nr_pages
, 1, pages
);
1518 EXPORT_SYMBOL_GPL(gfn_to_page_many_atomic
);
1520 static struct page
*kvm_pfn_to_page(kvm_pfn_t pfn
)
1522 if (is_error_noslot_pfn(pfn
))
1523 return KVM_ERR_PTR_BAD_PAGE
;
1525 if (kvm_is_reserved_pfn(pfn
)) {
1527 return KVM_ERR_PTR_BAD_PAGE
;
1530 return pfn_to_page(pfn
);
1533 struct page
*gfn_to_page(struct kvm
*kvm
, gfn_t gfn
)
1537 pfn
= gfn_to_pfn(kvm
, gfn
);
1539 return kvm_pfn_to_page(pfn
);
1541 EXPORT_SYMBOL_GPL(gfn_to_page
);
1543 struct page
*kvm_vcpu_gfn_to_page(struct kvm_vcpu
*vcpu
, gfn_t gfn
)
1547 pfn
= kvm_vcpu_gfn_to_pfn(vcpu
, gfn
);
1549 return kvm_pfn_to_page(pfn
);
1551 EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_page
);
1553 void kvm_release_page_clean(struct page
*page
)
1555 WARN_ON(is_error_page(page
));
1557 kvm_release_pfn_clean(page_to_pfn(page
));
1559 EXPORT_SYMBOL_GPL(kvm_release_page_clean
);
1561 void kvm_release_pfn_clean(kvm_pfn_t pfn
)
1563 if (!is_error_noslot_pfn(pfn
) && !kvm_is_reserved_pfn(pfn
))
1564 put_page(pfn_to_page(pfn
));
1566 EXPORT_SYMBOL_GPL(kvm_release_pfn_clean
);
1568 void kvm_release_page_dirty(struct page
*page
)
1570 WARN_ON(is_error_page(page
));
1572 kvm_release_pfn_dirty(page_to_pfn(page
));
1574 EXPORT_SYMBOL_GPL(kvm_release_page_dirty
);
1576 static void kvm_release_pfn_dirty(kvm_pfn_t pfn
)
1578 kvm_set_pfn_dirty(pfn
);
1579 kvm_release_pfn_clean(pfn
);
1582 void kvm_set_pfn_dirty(kvm_pfn_t pfn
)
1584 if (!kvm_is_reserved_pfn(pfn
)) {
1585 struct page
*page
= pfn_to_page(pfn
);
1587 if (!PageReserved(page
))
1591 EXPORT_SYMBOL_GPL(kvm_set_pfn_dirty
);
1593 void kvm_set_pfn_accessed(kvm_pfn_t pfn
)
1595 if (!kvm_is_reserved_pfn(pfn
))
1596 mark_page_accessed(pfn_to_page(pfn
));
1598 EXPORT_SYMBOL_GPL(kvm_set_pfn_accessed
);
1600 void kvm_get_pfn(kvm_pfn_t pfn
)
1602 if (!kvm_is_reserved_pfn(pfn
))
1603 get_page(pfn_to_page(pfn
));
1605 EXPORT_SYMBOL_GPL(kvm_get_pfn
);
1607 static int next_segment(unsigned long len
, int offset
)
1609 if (len
> PAGE_SIZE
- offset
)
1610 return PAGE_SIZE
- offset
;
1615 static int __kvm_read_guest_page(struct kvm_memory_slot
*slot
, gfn_t gfn
,
1616 void *data
, int offset
, int len
)
1621 addr
= gfn_to_hva_memslot_prot(slot
, gfn
, NULL
);
1622 if (kvm_is_error_hva(addr
))
1624 r
= __copy_from_user(data
, (void __user
*)addr
+ offset
, len
);
1630 int kvm_read_guest_page(struct kvm
*kvm
, gfn_t gfn
, void *data
, int offset
,
1633 struct kvm_memory_slot
*slot
= gfn_to_memslot(kvm
, gfn
);
1635 return __kvm_read_guest_page(slot
, gfn
, data
, offset
, len
);
1637 EXPORT_SYMBOL_GPL(kvm_read_guest_page
);
1639 int kvm_vcpu_read_guest_page(struct kvm_vcpu
*vcpu
, gfn_t gfn
, void *data
,
1640 int offset
, int len
)
1642 struct kvm_memory_slot
*slot
= kvm_vcpu_gfn_to_memslot(vcpu
, gfn
);
1644 return __kvm_read_guest_page(slot
, gfn
, data
, offset
, len
);
1646 EXPORT_SYMBOL_GPL(kvm_vcpu_read_guest_page
);
1648 int kvm_read_guest(struct kvm
*kvm
, gpa_t gpa
, void *data
, unsigned long len
)
1650 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1652 int offset
= offset_in_page(gpa
);
1655 while ((seg
= next_segment(len
, offset
)) != 0) {
1656 ret
= kvm_read_guest_page(kvm
, gfn
, data
, offset
, seg
);
1666 EXPORT_SYMBOL_GPL(kvm_read_guest
);
1668 int kvm_vcpu_read_guest(struct kvm_vcpu
*vcpu
, gpa_t gpa
, void *data
, unsigned long len
)
1670 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1672 int offset
= offset_in_page(gpa
);
1675 while ((seg
= next_segment(len
, offset
)) != 0) {
1676 ret
= kvm_vcpu_read_guest_page(vcpu
, gfn
, data
, offset
, seg
);
1686 EXPORT_SYMBOL_GPL(kvm_vcpu_read_guest
);
1688 static int __kvm_read_guest_atomic(struct kvm_memory_slot
*slot
, gfn_t gfn
,
1689 void *data
, int offset
, unsigned long len
)
1694 addr
= gfn_to_hva_memslot_prot(slot
, gfn
, NULL
);
1695 if (kvm_is_error_hva(addr
))
1697 pagefault_disable();
1698 r
= __copy_from_user_inatomic(data
, (void __user
*)addr
+ offset
, len
);
1705 int kvm_read_guest_atomic(struct kvm
*kvm
, gpa_t gpa
, void *data
,
1708 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1709 struct kvm_memory_slot
*slot
= gfn_to_memslot(kvm
, gfn
);
1710 int offset
= offset_in_page(gpa
);
1712 return __kvm_read_guest_atomic(slot
, gfn
, data
, offset
, len
);
1714 EXPORT_SYMBOL_GPL(kvm_read_guest_atomic
);
1716 int kvm_vcpu_read_guest_atomic(struct kvm_vcpu
*vcpu
, gpa_t gpa
,
1717 void *data
, unsigned long len
)
1719 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1720 struct kvm_memory_slot
*slot
= kvm_vcpu_gfn_to_memslot(vcpu
, gfn
);
1721 int offset
= offset_in_page(gpa
);
1723 return __kvm_read_guest_atomic(slot
, gfn
, data
, offset
, len
);
1725 EXPORT_SYMBOL_GPL(kvm_vcpu_read_guest_atomic
);
1727 static int __kvm_write_guest_page(struct kvm_memory_slot
*memslot
, gfn_t gfn
,
1728 const void *data
, int offset
, int len
)
1733 addr
= gfn_to_hva_memslot(memslot
, gfn
);
1734 if (kvm_is_error_hva(addr
))
1736 r
= __copy_to_user((void __user
*)addr
+ offset
, data
, len
);
1739 mark_page_dirty_in_slot(memslot
, gfn
);
1743 int kvm_write_guest_page(struct kvm
*kvm
, gfn_t gfn
,
1744 const void *data
, int offset
, int len
)
1746 struct kvm_memory_slot
*slot
= gfn_to_memslot(kvm
, gfn
);
1748 return __kvm_write_guest_page(slot
, gfn
, data
, offset
, len
);
1750 EXPORT_SYMBOL_GPL(kvm_write_guest_page
);
1752 int kvm_vcpu_write_guest_page(struct kvm_vcpu
*vcpu
, gfn_t gfn
,
1753 const void *data
, int offset
, int len
)
1755 struct kvm_memory_slot
*slot
= kvm_vcpu_gfn_to_memslot(vcpu
, gfn
);
1757 return __kvm_write_guest_page(slot
, gfn
, data
, offset
, len
);
1759 EXPORT_SYMBOL_GPL(kvm_vcpu_write_guest_page
);
1761 int kvm_write_guest(struct kvm
*kvm
, gpa_t gpa
, const void *data
,
1764 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1766 int offset
= offset_in_page(gpa
);
1769 while ((seg
= next_segment(len
, offset
)) != 0) {
1770 ret
= kvm_write_guest_page(kvm
, gfn
, data
, offset
, seg
);
1780 EXPORT_SYMBOL_GPL(kvm_write_guest
);
1782 int kvm_vcpu_write_guest(struct kvm_vcpu
*vcpu
, gpa_t gpa
, const void *data
,
1785 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1787 int offset
= offset_in_page(gpa
);
1790 while ((seg
= next_segment(len
, offset
)) != 0) {
1791 ret
= kvm_vcpu_write_guest_page(vcpu
, gfn
, data
, offset
, seg
);
1801 EXPORT_SYMBOL_GPL(kvm_vcpu_write_guest
);
1803 int kvm_gfn_to_hva_cache_init(struct kvm
*kvm
, struct gfn_to_hva_cache
*ghc
,
1804 gpa_t gpa
, unsigned long len
)
1806 struct kvm_memslots
*slots
= kvm_memslots(kvm
);
1807 int offset
= offset_in_page(gpa
);
1808 gfn_t start_gfn
= gpa
>> PAGE_SHIFT
;
1809 gfn_t end_gfn
= (gpa
+ len
- 1) >> PAGE_SHIFT
;
1810 gfn_t nr_pages_needed
= end_gfn
- start_gfn
+ 1;
1811 gfn_t nr_pages_avail
;
1814 ghc
->generation
= slots
->generation
;
1816 ghc
->memslot
= gfn_to_memslot(kvm
, start_gfn
);
1817 ghc
->hva
= gfn_to_hva_many(ghc
->memslot
, start_gfn
, NULL
);
1818 if (!kvm_is_error_hva(ghc
->hva
) && nr_pages_needed
<= 1) {
1822 * If the requested region crosses two memslots, we still
1823 * verify that the entire region is valid here.
1825 while (start_gfn
<= end_gfn
) {
1826 ghc
->memslot
= gfn_to_memslot(kvm
, start_gfn
);
1827 ghc
->hva
= gfn_to_hva_many(ghc
->memslot
, start_gfn
,
1829 if (kvm_is_error_hva(ghc
->hva
))
1831 start_gfn
+= nr_pages_avail
;
1833 /* Use the slow path for cross page reads and writes. */
1834 ghc
->memslot
= NULL
;
1838 EXPORT_SYMBOL_GPL(kvm_gfn_to_hva_cache_init
);
1840 int kvm_write_guest_cached(struct kvm
*kvm
, struct gfn_to_hva_cache
*ghc
,
1841 void *data
, unsigned long len
)
1843 struct kvm_memslots
*slots
= kvm_memslots(kvm
);
1846 BUG_ON(len
> ghc
->len
);
1848 if (slots
->generation
!= ghc
->generation
)
1849 kvm_gfn_to_hva_cache_init(kvm
, ghc
, ghc
->gpa
, ghc
->len
);
1851 if (unlikely(!ghc
->memslot
))
1852 return kvm_write_guest(kvm
, ghc
->gpa
, data
, len
);
1854 if (kvm_is_error_hva(ghc
->hva
))
1857 r
= __copy_to_user((void __user
*)ghc
->hva
, data
, len
);
1860 mark_page_dirty_in_slot(ghc
->memslot
, ghc
->gpa
>> PAGE_SHIFT
);
1864 EXPORT_SYMBOL_GPL(kvm_write_guest_cached
);
1866 int kvm_read_guest_cached(struct kvm
*kvm
, struct gfn_to_hva_cache
*ghc
,
1867 void *data
, unsigned long len
)
1869 struct kvm_memslots
*slots
= kvm_memslots(kvm
);
1872 BUG_ON(len
> ghc
->len
);
1874 if (slots
->generation
!= ghc
->generation
)
1875 kvm_gfn_to_hva_cache_init(kvm
, ghc
, ghc
->gpa
, ghc
->len
);
1877 if (unlikely(!ghc
->memslot
))
1878 return kvm_read_guest(kvm
, ghc
->gpa
, data
, len
);
1880 if (kvm_is_error_hva(ghc
->hva
))
1883 r
= __copy_from_user(data
, (void __user
*)ghc
->hva
, len
);
1889 EXPORT_SYMBOL_GPL(kvm_read_guest_cached
);
1891 int kvm_clear_guest_page(struct kvm
*kvm
, gfn_t gfn
, int offset
, int len
)
1893 const void *zero_page
= (const void *) __va(page_to_phys(ZERO_PAGE(0)));
1895 return kvm_write_guest_page(kvm
, gfn
, zero_page
, offset
, len
);
1897 EXPORT_SYMBOL_GPL(kvm_clear_guest_page
);
1899 int kvm_clear_guest(struct kvm
*kvm
, gpa_t gpa
, unsigned long len
)
1901 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1903 int offset
= offset_in_page(gpa
);
1906 while ((seg
= next_segment(len
, offset
)) != 0) {
1907 ret
= kvm_clear_guest_page(kvm
, gfn
, offset
, seg
);
1916 EXPORT_SYMBOL_GPL(kvm_clear_guest
);
1918 static void mark_page_dirty_in_slot(struct kvm_memory_slot
*memslot
,
1921 if (memslot
&& memslot
->dirty_bitmap
) {
1922 unsigned long rel_gfn
= gfn
- memslot
->base_gfn
;
1924 set_bit_le(rel_gfn
, memslot
->dirty_bitmap
);
1928 void mark_page_dirty(struct kvm
*kvm
, gfn_t gfn
)
1930 struct kvm_memory_slot
*memslot
;
1932 memslot
= gfn_to_memslot(kvm
, gfn
);
1933 mark_page_dirty_in_slot(memslot
, gfn
);
1935 EXPORT_SYMBOL_GPL(mark_page_dirty
);
1937 void kvm_vcpu_mark_page_dirty(struct kvm_vcpu
*vcpu
, gfn_t gfn
)
1939 struct kvm_memory_slot
*memslot
;
1941 memslot
= kvm_vcpu_gfn_to_memslot(vcpu
, gfn
);
1942 mark_page_dirty_in_slot(memslot
, gfn
);
1944 EXPORT_SYMBOL_GPL(kvm_vcpu_mark_page_dirty
);
1946 static void grow_halt_poll_ns(struct kvm_vcpu
*vcpu
)
1948 unsigned int old
, val
, grow
;
1950 old
= val
= vcpu
->halt_poll_ns
;
1951 grow
= READ_ONCE(halt_poll_ns_grow
);
1953 if (val
== 0 && grow
)
1958 if (val
> halt_poll_ns
)
1961 vcpu
->halt_poll_ns
= val
;
1962 trace_kvm_halt_poll_ns_grow(vcpu
->vcpu_id
, val
, old
);
1965 static void shrink_halt_poll_ns(struct kvm_vcpu
*vcpu
)
1967 unsigned int old
, val
, shrink
;
1969 old
= val
= vcpu
->halt_poll_ns
;
1970 shrink
= READ_ONCE(halt_poll_ns_shrink
);
1976 vcpu
->halt_poll_ns
= val
;
1977 trace_kvm_halt_poll_ns_shrink(vcpu
->vcpu_id
, val
, old
);
1980 static int kvm_vcpu_check_block(struct kvm_vcpu
*vcpu
)
1982 if (kvm_arch_vcpu_runnable(vcpu
)) {
1983 kvm_make_request(KVM_REQ_UNHALT
, vcpu
);
1986 if (kvm_cpu_has_pending_timer(vcpu
))
1988 if (signal_pending(current
))
1995 * The vCPU has executed a HLT instruction with in-kernel mode enabled.
1997 void kvm_vcpu_block(struct kvm_vcpu
*vcpu
)
2000 DECLARE_SWAITQUEUE(wait
);
2001 bool waited
= false;
2004 start
= cur
= ktime_get();
2005 if (vcpu
->halt_poll_ns
) {
2006 ktime_t stop
= ktime_add_ns(ktime_get(), vcpu
->halt_poll_ns
);
2008 ++vcpu
->stat
.halt_attempted_poll
;
2011 * This sets KVM_REQ_UNHALT if an interrupt
2014 if (kvm_vcpu_check_block(vcpu
) < 0) {
2015 ++vcpu
->stat
.halt_successful_poll
;
2019 } while (single_task_running() && ktime_before(cur
, stop
));
2022 kvm_arch_vcpu_blocking(vcpu
);
2025 prepare_to_swait(&vcpu
->wq
, &wait
, TASK_INTERRUPTIBLE
);
2027 if (kvm_vcpu_check_block(vcpu
) < 0)
2034 finish_swait(&vcpu
->wq
, &wait
);
2037 kvm_arch_vcpu_unblocking(vcpu
);
2039 block_ns
= ktime_to_ns(cur
) - ktime_to_ns(start
);
2042 if (block_ns
<= vcpu
->halt_poll_ns
)
2044 /* we had a long block, shrink polling */
2045 else if (vcpu
->halt_poll_ns
&& block_ns
> halt_poll_ns
)
2046 shrink_halt_poll_ns(vcpu
);
2047 /* we had a short halt and our poll time is too small */
2048 else if (vcpu
->halt_poll_ns
< halt_poll_ns
&&
2049 block_ns
< halt_poll_ns
)
2050 grow_halt_poll_ns(vcpu
);
2052 vcpu
->halt_poll_ns
= 0;
2054 trace_kvm_vcpu_wakeup(block_ns
, waited
);
2056 EXPORT_SYMBOL_GPL(kvm_vcpu_block
);
2060 * Kick a sleeping VCPU, or a guest VCPU in guest mode, into host kernel mode.
2062 void kvm_vcpu_kick(struct kvm_vcpu
*vcpu
)
2065 int cpu
= vcpu
->cpu
;
2066 struct swait_queue_head
*wqp
;
2068 wqp
= kvm_arch_vcpu_wq(vcpu
);
2069 if (swait_active(wqp
)) {
2071 ++vcpu
->stat
.halt_wakeup
;
2075 if (cpu
!= me
&& (unsigned)cpu
< nr_cpu_ids
&& cpu_online(cpu
))
2076 if (kvm_arch_vcpu_should_kick(vcpu
))
2077 smp_send_reschedule(cpu
);
2080 EXPORT_SYMBOL_GPL(kvm_vcpu_kick
);
2081 #endif /* !CONFIG_S390 */
2083 int kvm_vcpu_yield_to(struct kvm_vcpu
*target
)
2086 struct task_struct
*task
= NULL
;
2090 pid
= rcu_dereference(target
->pid
);
2092 task
= get_pid_task(pid
, PIDTYPE_PID
);
2096 ret
= yield_to(task
, 1);
2097 put_task_struct(task
);
2101 EXPORT_SYMBOL_GPL(kvm_vcpu_yield_to
);
2104 * Helper that checks whether a VCPU is eligible for directed yield.
2105 * Most eligible candidate to yield is decided by following heuristics:
2107 * (a) VCPU which has not done pl-exit or cpu relax intercepted recently
2108 * (preempted lock holder), indicated by @in_spin_loop.
2109 * Set at the beiginning and cleared at the end of interception/PLE handler.
2111 * (b) VCPU which has done pl-exit/ cpu relax intercepted but did not get
2112 * chance last time (mostly it has become eligible now since we have probably
2113 * yielded to lockholder in last iteration. This is done by toggling
2114 * @dy_eligible each time a VCPU checked for eligibility.)
2116 * Yielding to a recently pl-exited/cpu relax intercepted VCPU before yielding
2117 * to preempted lock-holder could result in wrong VCPU selection and CPU
2118 * burning. Giving priority for a potential lock-holder increases lock
2121 * Since algorithm is based on heuristics, accessing another VCPU data without
2122 * locking does not harm. It may result in trying to yield to same VCPU, fail
2123 * and continue with next VCPU and so on.
2125 static bool kvm_vcpu_eligible_for_directed_yield(struct kvm_vcpu
*vcpu
)
2127 #ifdef CONFIG_HAVE_KVM_CPU_RELAX_INTERCEPT
2130 eligible
= !vcpu
->spin_loop
.in_spin_loop
||
2131 vcpu
->spin_loop
.dy_eligible
;
2133 if (vcpu
->spin_loop
.in_spin_loop
)
2134 kvm_vcpu_set_dy_eligible(vcpu
, !vcpu
->spin_loop
.dy_eligible
);
2142 void kvm_vcpu_on_spin(struct kvm_vcpu
*me
)
2144 struct kvm
*kvm
= me
->kvm
;
2145 struct kvm_vcpu
*vcpu
;
2146 int last_boosted_vcpu
= me
->kvm
->last_boosted_vcpu
;
2152 kvm_vcpu_set_in_spin_loop(me
, true);
2154 * We boost the priority of a VCPU that is runnable but not
2155 * currently running, because it got preempted by something
2156 * else and called schedule in __vcpu_run. Hopefully that
2157 * VCPU is holding the lock that we need and will release it.
2158 * We approximate round-robin by starting at the last boosted VCPU.
2160 for (pass
= 0; pass
< 2 && !yielded
&& try; pass
++) {
2161 kvm_for_each_vcpu(i
, vcpu
, kvm
) {
2162 if (!pass
&& i
<= last_boosted_vcpu
) {
2163 i
= last_boosted_vcpu
;
2165 } else if (pass
&& i
> last_boosted_vcpu
)
2167 if (!ACCESS_ONCE(vcpu
->preempted
))
2171 if (swait_active(&vcpu
->wq
) && !kvm_arch_vcpu_runnable(vcpu
))
2173 if (!kvm_vcpu_eligible_for_directed_yield(vcpu
))
2176 yielded
= kvm_vcpu_yield_to(vcpu
);
2178 kvm
->last_boosted_vcpu
= i
;
2180 } else if (yielded
< 0) {
2187 kvm_vcpu_set_in_spin_loop(me
, false);
2189 /* Ensure vcpu is not eligible during next spinloop */
2190 kvm_vcpu_set_dy_eligible(me
, false);
2192 EXPORT_SYMBOL_GPL(kvm_vcpu_on_spin
);
2194 static int kvm_vcpu_fault(struct vm_area_struct
*vma
, struct vm_fault
*vmf
)
2196 struct kvm_vcpu
*vcpu
= vma
->vm_file
->private_data
;
2199 if (vmf
->pgoff
== 0)
2200 page
= virt_to_page(vcpu
->run
);
2202 else if (vmf
->pgoff
== KVM_PIO_PAGE_OFFSET
)
2203 page
= virt_to_page(vcpu
->arch
.pio_data
);
2205 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2206 else if (vmf
->pgoff
== KVM_COALESCED_MMIO_PAGE_OFFSET
)
2207 page
= virt_to_page(vcpu
->kvm
->coalesced_mmio_ring
);
2210 return kvm_arch_vcpu_fault(vcpu
, vmf
);
2216 static const struct vm_operations_struct kvm_vcpu_vm_ops
= {
2217 .fault
= kvm_vcpu_fault
,
2220 static int kvm_vcpu_mmap(struct file
*file
, struct vm_area_struct
*vma
)
2222 vma
->vm_ops
= &kvm_vcpu_vm_ops
;
2226 static int kvm_vcpu_release(struct inode
*inode
, struct file
*filp
)
2228 struct kvm_vcpu
*vcpu
= filp
->private_data
;
2230 kvm_put_kvm(vcpu
->kvm
);
2234 static struct file_operations kvm_vcpu_fops
= {
2235 .release
= kvm_vcpu_release
,
2236 .unlocked_ioctl
= kvm_vcpu_ioctl
,
2237 #ifdef CONFIG_KVM_COMPAT
2238 .compat_ioctl
= kvm_vcpu_compat_ioctl
,
2240 .mmap
= kvm_vcpu_mmap
,
2241 .llseek
= noop_llseek
,
2245 * Allocates an inode for the vcpu.
2247 static int create_vcpu_fd(struct kvm_vcpu
*vcpu
)
2249 return anon_inode_getfd("kvm-vcpu", &kvm_vcpu_fops
, vcpu
, O_RDWR
| O_CLOEXEC
);
2253 * Creates some virtual cpus. Good luck creating more than one.
2255 static int kvm_vm_ioctl_create_vcpu(struct kvm
*kvm
, u32 id
)
2258 struct kvm_vcpu
*vcpu
;
2260 if (id
>= KVM_MAX_VCPUS
)
2263 vcpu
= kvm_arch_vcpu_create(kvm
, id
);
2265 return PTR_ERR(vcpu
);
2267 preempt_notifier_init(&vcpu
->preempt_notifier
, &kvm_preempt_ops
);
2269 r
= kvm_arch_vcpu_setup(vcpu
);
2273 mutex_lock(&kvm
->lock
);
2274 if (!kvm_vcpu_compatible(vcpu
)) {
2276 goto unlock_vcpu_destroy
;
2278 if (atomic_read(&kvm
->online_vcpus
) == KVM_MAX_VCPUS
) {
2280 goto unlock_vcpu_destroy
;
2282 if (kvm_get_vcpu_by_id(kvm
, id
)) {
2284 goto unlock_vcpu_destroy
;
2287 BUG_ON(kvm
->vcpus
[atomic_read(&kvm
->online_vcpus
)]);
2289 /* Now it's all set up, let userspace reach it */
2291 r
= create_vcpu_fd(vcpu
);
2294 goto unlock_vcpu_destroy
;
2297 kvm
->vcpus
[atomic_read(&kvm
->online_vcpus
)] = vcpu
;
2300 * Pairs with smp_rmb() in kvm_get_vcpu. Write kvm->vcpus
2301 * before kvm->online_vcpu's incremented value.
2304 atomic_inc(&kvm
->online_vcpus
);
2306 mutex_unlock(&kvm
->lock
);
2307 kvm_arch_vcpu_postcreate(vcpu
);
2310 unlock_vcpu_destroy
:
2311 mutex_unlock(&kvm
->lock
);
2313 kvm_arch_vcpu_destroy(vcpu
);
2317 static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu
*vcpu
, sigset_t
*sigset
)
2320 sigdelsetmask(sigset
, sigmask(SIGKILL
)|sigmask(SIGSTOP
));
2321 vcpu
->sigset_active
= 1;
2322 vcpu
->sigset
= *sigset
;
2324 vcpu
->sigset_active
= 0;
2328 static long kvm_vcpu_ioctl(struct file
*filp
,
2329 unsigned int ioctl
, unsigned long arg
)
2331 struct kvm_vcpu
*vcpu
= filp
->private_data
;
2332 void __user
*argp
= (void __user
*)arg
;
2334 struct kvm_fpu
*fpu
= NULL
;
2335 struct kvm_sregs
*kvm_sregs
= NULL
;
2337 if (vcpu
->kvm
->mm
!= current
->mm
)
2340 if (unlikely(_IOC_TYPE(ioctl
) != KVMIO
))
2343 #if defined(CONFIG_S390) || defined(CONFIG_PPC) || defined(CONFIG_MIPS)
2345 * Special cases: vcpu ioctls that are asynchronous to vcpu execution,
2346 * so vcpu_load() would break it.
2348 if (ioctl
== KVM_S390_INTERRUPT
|| ioctl
== KVM_S390_IRQ
|| ioctl
== KVM_INTERRUPT
)
2349 return kvm_arch_vcpu_ioctl(filp
, ioctl
, arg
);
2353 r
= vcpu_load(vcpu
);
2361 if (unlikely(vcpu
->pid
!= current
->pids
[PIDTYPE_PID
].pid
)) {
2362 /* The thread running this VCPU changed. */
2363 struct pid
*oldpid
= vcpu
->pid
;
2364 struct pid
*newpid
= get_task_pid(current
, PIDTYPE_PID
);
2366 rcu_assign_pointer(vcpu
->pid
, newpid
);
2371 r
= kvm_arch_vcpu_ioctl_run(vcpu
, vcpu
->run
);
2372 trace_kvm_userspace_exit(vcpu
->run
->exit_reason
, r
);
2374 case KVM_GET_REGS
: {
2375 struct kvm_regs
*kvm_regs
;
2378 kvm_regs
= kzalloc(sizeof(struct kvm_regs
), GFP_KERNEL
);
2381 r
= kvm_arch_vcpu_ioctl_get_regs(vcpu
, kvm_regs
);
2385 if (copy_to_user(argp
, kvm_regs
, sizeof(struct kvm_regs
)))
2392 case KVM_SET_REGS
: {
2393 struct kvm_regs
*kvm_regs
;
2396 kvm_regs
= memdup_user(argp
, sizeof(*kvm_regs
));
2397 if (IS_ERR(kvm_regs
)) {
2398 r
= PTR_ERR(kvm_regs
);
2401 r
= kvm_arch_vcpu_ioctl_set_regs(vcpu
, kvm_regs
);
2405 case KVM_GET_SREGS
: {
2406 kvm_sregs
= kzalloc(sizeof(struct kvm_sregs
), GFP_KERNEL
);
2410 r
= kvm_arch_vcpu_ioctl_get_sregs(vcpu
, kvm_sregs
);
2414 if (copy_to_user(argp
, kvm_sregs
, sizeof(struct kvm_sregs
)))
2419 case KVM_SET_SREGS
: {
2420 kvm_sregs
= memdup_user(argp
, sizeof(*kvm_sregs
));
2421 if (IS_ERR(kvm_sregs
)) {
2422 r
= PTR_ERR(kvm_sregs
);
2426 r
= kvm_arch_vcpu_ioctl_set_sregs(vcpu
, kvm_sregs
);
2429 case KVM_GET_MP_STATE
: {
2430 struct kvm_mp_state mp_state
;
2432 r
= kvm_arch_vcpu_ioctl_get_mpstate(vcpu
, &mp_state
);
2436 if (copy_to_user(argp
, &mp_state
, sizeof(mp_state
)))
2441 case KVM_SET_MP_STATE
: {
2442 struct kvm_mp_state mp_state
;
2445 if (copy_from_user(&mp_state
, argp
, sizeof(mp_state
)))
2447 r
= kvm_arch_vcpu_ioctl_set_mpstate(vcpu
, &mp_state
);
2450 case KVM_TRANSLATE
: {
2451 struct kvm_translation tr
;
2454 if (copy_from_user(&tr
, argp
, sizeof(tr
)))
2456 r
= kvm_arch_vcpu_ioctl_translate(vcpu
, &tr
);
2460 if (copy_to_user(argp
, &tr
, sizeof(tr
)))
2465 case KVM_SET_GUEST_DEBUG
: {
2466 struct kvm_guest_debug dbg
;
2469 if (copy_from_user(&dbg
, argp
, sizeof(dbg
)))
2471 r
= kvm_arch_vcpu_ioctl_set_guest_debug(vcpu
, &dbg
);
2474 case KVM_SET_SIGNAL_MASK
: {
2475 struct kvm_signal_mask __user
*sigmask_arg
= argp
;
2476 struct kvm_signal_mask kvm_sigmask
;
2477 sigset_t sigset
, *p
;
2482 if (copy_from_user(&kvm_sigmask
, argp
,
2483 sizeof(kvm_sigmask
)))
2486 if (kvm_sigmask
.len
!= sizeof(sigset
))
2489 if (copy_from_user(&sigset
, sigmask_arg
->sigset
,
2494 r
= kvm_vcpu_ioctl_set_sigmask(vcpu
, p
);
2498 fpu
= kzalloc(sizeof(struct kvm_fpu
), GFP_KERNEL
);
2502 r
= kvm_arch_vcpu_ioctl_get_fpu(vcpu
, fpu
);
2506 if (copy_to_user(argp
, fpu
, sizeof(struct kvm_fpu
)))
2512 fpu
= memdup_user(argp
, sizeof(*fpu
));
2518 r
= kvm_arch_vcpu_ioctl_set_fpu(vcpu
, fpu
);
2522 r
= kvm_arch_vcpu_ioctl(filp
, ioctl
, arg
);
2531 #ifdef CONFIG_KVM_COMPAT
2532 static long kvm_vcpu_compat_ioctl(struct file
*filp
,
2533 unsigned int ioctl
, unsigned long arg
)
2535 struct kvm_vcpu
*vcpu
= filp
->private_data
;
2536 void __user
*argp
= compat_ptr(arg
);
2539 if (vcpu
->kvm
->mm
!= current
->mm
)
2543 case KVM_SET_SIGNAL_MASK
: {
2544 struct kvm_signal_mask __user
*sigmask_arg
= argp
;
2545 struct kvm_signal_mask kvm_sigmask
;
2546 compat_sigset_t csigset
;
2551 if (copy_from_user(&kvm_sigmask
, argp
,
2552 sizeof(kvm_sigmask
)))
2555 if (kvm_sigmask
.len
!= sizeof(csigset
))
2558 if (copy_from_user(&csigset
, sigmask_arg
->sigset
,
2561 sigset_from_compat(&sigset
, &csigset
);
2562 r
= kvm_vcpu_ioctl_set_sigmask(vcpu
, &sigset
);
2564 r
= kvm_vcpu_ioctl_set_sigmask(vcpu
, NULL
);
2568 r
= kvm_vcpu_ioctl(filp
, ioctl
, arg
);
2576 static int kvm_device_ioctl_attr(struct kvm_device
*dev
,
2577 int (*accessor
)(struct kvm_device
*dev
,
2578 struct kvm_device_attr
*attr
),
2581 struct kvm_device_attr attr
;
2586 if (copy_from_user(&attr
, (void __user
*)arg
, sizeof(attr
)))
2589 return accessor(dev
, &attr
);
2592 static long kvm_device_ioctl(struct file
*filp
, unsigned int ioctl
,
2595 struct kvm_device
*dev
= filp
->private_data
;
2598 case KVM_SET_DEVICE_ATTR
:
2599 return kvm_device_ioctl_attr(dev
, dev
->ops
->set_attr
, arg
);
2600 case KVM_GET_DEVICE_ATTR
:
2601 return kvm_device_ioctl_attr(dev
, dev
->ops
->get_attr
, arg
);
2602 case KVM_HAS_DEVICE_ATTR
:
2603 return kvm_device_ioctl_attr(dev
, dev
->ops
->has_attr
, arg
);
2605 if (dev
->ops
->ioctl
)
2606 return dev
->ops
->ioctl(dev
, ioctl
, arg
);
2612 static int kvm_device_release(struct inode
*inode
, struct file
*filp
)
2614 struct kvm_device
*dev
= filp
->private_data
;
2615 struct kvm
*kvm
= dev
->kvm
;
2621 static const struct file_operations kvm_device_fops
= {
2622 .unlocked_ioctl
= kvm_device_ioctl
,
2623 #ifdef CONFIG_KVM_COMPAT
2624 .compat_ioctl
= kvm_device_ioctl
,
2626 .release
= kvm_device_release
,
2629 struct kvm_device
*kvm_device_from_filp(struct file
*filp
)
2631 if (filp
->f_op
!= &kvm_device_fops
)
2634 return filp
->private_data
;
2637 static struct kvm_device_ops
*kvm_device_ops_table
[KVM_DEV_TYPE_MAX
] = {
2638 #ifdef CONFIG_KVM_MPIC
2639 [KVM_DEV_TYPE_FSL_MPIC_20
] = &kvm_mpic_ops
,
2640 [KVM_DEV_TYPE_FSL_MPIC_42
] = &kvm_mpic_ops
,
2643 #ifdef CONFIG_KVM_XICS
2644 [KVM_DEV_TYPE_XICS
] = &kvm_xics_ops
,
2648 int kvm_register_device_ops(struct kvm_device_ops
*ops
, u32 type
)
2650 if (type
>= ARRAY_SIZE(kvm_device_ops_table
))
2653 if (kvm_device_ops_table
[type
] != NULL
)
2656 kvm_device_ops_table
[type
] = ops
;
2660 void kvm_unregister_device_ops(u32 type
)
2662 if (kvm_device_ops_table
[type
] != NULL
)
2663 kvm_device_ops_table
[type
] = NULL
;
2666 static int kvm_ioctl_create_device(struct kvm
*kvm
,
2667 struct kvm_create_device
*cd
)
2669 struct kvm_device_ops
*ops
= NULL
;
2670 struct kvm_device
*dev
;
2671 bool test
= cd
->flags
& KVM_CREATE_DEVICE_TEST
;
2674 if (cd
->type
>= ARRAY_SIZE(kvm_device_ops_table
))
2677 ops
= kvm_device_ops_table
[cd
->type
];
2684 dev
= kzalloc(sizeof(*dev
), GFP_KERNEL
);
2691 ret
= ops
->create(dev
, cd
->type
);
2697 ret
= anon_inode_getfd(ops
->name
, &kvm_device_fops
, dev
, O_RDWR
| O_CLOEXEC
);
2703 list_add(&dev
->vm_node
, &kvm
->devices
);
2709 static long kvm_vm_ioctl_check_extension_generic(struct kvm
*kvm
, long arg
)
2712 case KVM_CAP_USER_MEMORY
:
2713 case KVM_CAP_DESTROY_MEMORY_REGION_WORKS
:
2714 case KVM_CAP_JOIN_MEMORY_REGIONS_WORKS
:
2715 case KVM_CAP_INTERNAL_ERROR_DATA
:
2716 #ifdef CONFIG_HAVE_KVM_MSI
2717 case KVM_CAP_SIGNAL_MSI
:
2719 #ifdef CONFIG_HAVE_KVM_IRQFD
2721 case KVM_CAP_IRQFD_RESAMPLE
:
2723 case KVM_CAP_IOEVENTFD_ANY_LENGTH
:
2724 case KVM_CAP_CHECK_EXTENSION_VM
:
2726 #ifdef CONFIG_HAVE_KVM_IRQ_ROUTING
2727 case KVM_CAP_IRQ_ROUTING
:
2728 return KVM_MAX_IRQ_ROUTES
;
2730 #if KVM_ADDRESS_SPACE_NUM > 1
2731 case KVM_CAP_MULTI_ADDRESS_SPACE
:
2732 return KVM_ADDRESS_SPACE_NUM
;
2737 return kvm_vm_ioctl_check_extension(kvm
, arg
);
2740 static long kvm_vm_ioctl(struct file
*filp
,
2741 unsigned int ioctl
, unsigned long arg
)
2743 struct kvm
*kvm
= filp
->private_data
;
2744 void __user
*argp
= (void __user
*)arg
;
2747 if (kvm
->mm
!= current
->mm
)
2750 case KVM_CREATE_VCPU
:
2751 r
= kvm_vm_ioctl_create_vcpu(kvm
, arg
);
2753 case KVM_SET_USER_MEMORY_REGION
: {
2754 struct kvm_userspace_memory_region kvm_userspace_mem
;
2757 if (copy_from_user(&kvm_userspace_mem
, argp
,
2758 sizeof(kvm_userspace_mem
)))
2761 r
= kvm_vm_ioctl_set_memory_region(kvm
, &kvm_userspace_mem
);
2764 case KVM_GET_DIRTY_LOG
: {
2765 struct kvm_dirty_log log
;
2768 if (copy_from_user(&log
, argp
, sizeof(log
)))
2770 r
= kvm_vm_ioctl_get_dirty_log(kvm
, &log
);
2773 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2774 case KVM_REGISTER_COALESCED_MMIO
: {
2775 struct kvm_coalesced_mmio_zone zone
;
2778 if (copy_from_user(&zone
, argp
, sizeof(zone
)))
2780 r
= kvm_vm_ioctl_register_coalesced_mmio(kvm
, &zone
);
2783 case KVM_UNREGISTER_COALESCED_MMIO
: {
2784 struct kvm_coalesced_mmio_zone zone
;
2787 if (copy_from_user(&zone
, argp
, sizeof(zone
)))
2789 r
= kvm_vm_ioctl_unregister_coalesced_mmio(kvm
, &zone
);
2794 struct kvm_irqfd data
;
2797 if (copy_from_user(&data
, argp
, sizeof(data
)))
2799 r
= kvm_irqfd(kvm
, &data
);
2802 case KVM_IOEVENTFD
: {
2803 struct kvm_ioeventfd data
;
2806 if (copy_from_user(&data
, argp
, sizeof(data
)))
2808 r
= kvm_ioeventfd(kvm
, &data
);
2811 #ifdef CONFIG_HAVE_KVM_MSI
2812 case KVM_SIGNAL_MSI
: {
2816 if (copy_from_user(&msi
, argp
, sizeof(msi
)))
2818 r
= kvm_send_userspace_msi(kvm
, &msi
);
2822 #ifdef __KVM_HAVE_IRQ_LINE
2823 case KVM_IRQ_LINE_STATUS
:
2824 case KVM_IRQ_LINE
: {
2825 struct kvm_irq_level irq_event
;
2828 if (copy_from_user(&irq_event
, argp
, sizeof(irq_event
)))
2831 r
= kvm_vm_ioctl_irq_line(kvm
, &irq_event
,
2832 ioctl
== KVM_IRQ_LINE_STATUS
);
2837 if (ioctl
== KVM_IRQ_LINE_STATUS
) {
2838 if (copy_to_user(argp
, &irq_event
, sizeof(irq_event
)))
2846 #ifdef CONFIG_HAVE_KVM_IRQ_ROUTING
2847 case KVM_SET_GSI_ROUTING
: {
2848 struct kvm_irq_routing routing
;
2849 struct kvm_irq_routing __user
*urouting
;
2850 struct kvm_irq_routing_entry
*entries
;
2853 if (copy_from_user(&routing
, argp
, sizeof(routing
)))
2856 if (routing
.nr
>= KVM_MAX_IRQ_ROUTES
)
2861 entries
= vmalloc(routing
.nr
* sizeof(*entries
));
2866 if (copy_from_user(entries
, urouting
->entries
,
2867 routing
.nr
* sizeof(*entries
)))
2868 goto out_free_irq_routing
;
2869 r
= kvm_set_irq_routing(kvm
, entries
, routing
.nr
,
2871 out_free_irq_routing
:
2875 #endif /* CONFIG_HAVE_KVM_IRQ_ROUTING */
2876 case KVM_CREATE_DEVICE
: {
2877 struct kvm_create_device cd
;
2880 if (copy_from_user(&cd
, argp
, sizeof(cd
)))
2883 r
= kvm_ioctl_create_device(kvm
, &cd
);
2888 if (copy_to_user(argp
, &cd
, sizeof(cd
)))
2894 case KVM_CHECK_EXTENSION
:
2895 r
= kvm_vm_ioctl_check_extension_generic(kvm
, arg
);
2898 r
= kvm_arch_vm_ioctl(filp
, ioctl
, arg
);
2904 #ifdef CONFIG_KVM_COMPAT
2905 struct compat_kvm_dirty_log
{
2909 compat_uptr_t dirty_bitmap
; /* one bit per page */
2914 static long kvm_vm_compat_ioctl(struct file
*filp
,
2915 unsigned int ioctl
, unsigned long arg
)
2917 struct kvm
*kvm
= filp
->private_data
;
2920 if (kvm
->mm
!= current
->mm
)
2923 case KVM_GET_DIRTY_LOG
: {
2924 struct compat_kvm_dirty_log compat_log
;
2925 struct kvm_dirty_log log
;
2928 if (copy_from_user(&compat_log
, (void __user
*)arg
,
2929 sizeof(compat_log
)))
2931 log
.slot
= compat_log
.slot
;
2932 log
.padding1
= compat_log
.padding1
;
2933 log
.padding2
= compat_log
.padding2
;
2934 log
.dirty_bitmap
= compat_ptr(compat_log
.dirty_bitmap
);
2936 r
= kvm_vm_ioctl_get_dirty_log(kvm
, &log
);
2940 r
= kvm_vm_ioctl(filp
, ioctl
, arg
);
2948 static struct file_operations kvm_vm_fops
= {
2949 .release
= kvm_vm_release
,
2950 .unlocked_ioctl
= kvm_vm_ioctl
,
2951 #ifdef CONFIG_KVM_COMPAT
2952 .compat_ioctl
= kvm_vm_compat_ioctl
,
2954 .llseek
= noop_llseek
,
2957 static int kvm_dev_ioctl_create_vm(unsigned long type
)
2962 kvm
= kvm_create_vm(type
);
2964 return PTR_ERR(kvm
);
2965 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2966 r
= kvm_coalesced_mmio_init(kvm
);
2972 r
= anon_inode_getfd("kvm-vm", &kvm_vm_fops
, kvm
, O_RDWR
| O_CLOEXEC
);
2979 static long kvm_dev_ioctl(struct file
*filp
,
2980 unsigned int ioctl
, unsigned long arg
)
2985 case KVM_GET_API_VERSION
:
2988 r
= KVM_API_VERSION
;
2991 r
= kvm_dev_ioctl_create_vm(arg
);
2993 case KVM_CHECK_EXTENSION
:
2994 r
= kvm_vm_ioctl_check_extension_generic(NULL
, arg
);
2996 case KVM_GET_VCPU_MMAP_SIZE
:
2999 r
= PAGE_SIZE
; /* struct kvm_run */
3001 r
+= PAGE_SIZE
; /* pio data page */
3003 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
3004 r
+= PAGE_SIZE
; /* coalesced mmio ring page */
3007 case KVM_TRACE_ENABLE
:
3008 case KVM_TRACE_PAUSE
:
3009 case KVM_TRACE_DISABLE
:
3013 return kvm_arch_dev_ioctl(filp
, ioctl
, arg
);
3019 static struct file_operations kvm_chardev_ops
= {
3020 .unlocked_ioctl
= kvm_dev_ioctl
,
3021 .compat_ioctl
= kvm_dev_ioctl
,
3022 .llseek
= noop_llseek
,
3025 static struct miscdevice kvm_dev
= {
3031 static void hardware_enable_nolock(void *junk
)
3033 int cpu
= raw_smp_processor_id();
3036 if (cpumask_test_cpu(cpu
, cpus_hardware_enabled
))
3039 cpumask_set_cpu(cpu
, cpus_hardware_enabled
);
3041 r
= kvm_arch_hardware_enable();
3044 cpumask_clear_cpu(cpu
, cpus_hardware_enabled
);
3045 atomic_inc(&hardware_enable_failed
);
3046 pr_info("kvm: enabling virtualization on CPU%d failed\n", cpu
);
3050 static void hardware_enable(void)
3052 raw_spin_lock(&kvm_count_lock
);
3053 if (kvm_usage_count
)
3054 hardware_enable_nolock(NULL
);
3055 raw_spin_unlock(&kvm_count_lock
);
3058 static void hardware_disable_nolock(void *junk
)
3060 int cpu
= raw_smp_processor_id();
3062 if (!cpumask_test_cpu(cpu
, cpus_hardware_enabled
))
3064 cpumask_clear_cpu(cpu
, cpus_hardware_enabled
);
3065 kvm_arch_hardware_disable();
3068 static void hardware_disable(void)
3070 raw_spin_lock(&kvm_count_lock
);
3071 if (kvm_usage_count
)
3072 hardware_disable_nolock(NULL
);
3073 raw_spin_unlock(&kvm_count_lock
);
3076 static void hardware_disable_all_nolock(void)
3078 BUG_ON(!kvm_usage_count
);
3081 if (!kvm_usage_count
)
3082 on_each_cpu(hardware_disable_nolock
, NULL
, 1);
3085 static void hardware_disable_all(void)
3087 raw_spin_lock(&kvm_count_lock
);
3088 hardware_disable_all_nolock();
3089 raw_spin_unlock(&kvm_count_lock
);
3092 static int hardware_enable_all(void)
3096 raw_spin_lock(&kvm_count_lock
);
3099 if (kvm_usage_count
== 1) {
3100 atomic_set(&hardware_enable_failed
, 0);
3101 on_each_cpu(hardware_enable_nolock
, NULL
, 1);
3103 if (atomic_read(&hardware_enable_failed
)) {
3104 hardware_disable_all_nolock();
3109 raw_spin_unlock(&kvm_count_lock
);
3114 static int kvm_cpu_hotplug(struct notifier_block
*notifier
, unsigned long val
,
3117 val
&= ~CPU_TASKS_FROZEN
;
3129 static int kvm_reboot(struct notifier_block
*notifier
, unsigned long val
,
3133 * Some (well, at least mine) BIOSes hang on reboot if
3136 * And Intel TXT required VMX off for all cpu when system shutdown.
3138 pr_info("kvm: exiting hardware virtualization\n");
3139 kvm_rebooting
= true;
3140 on_each_cpu(hardware_disable_nolock
, NULL
, 1);
3144 static struct notifier_block kvm_reboot_notifier
= {
3145 .notifier_call
= kvm_reboot
,
3149 static void kvm_io_bus_destroy(struct kvm_io_bus
*bus
)
3153 for (i
= 0; i
< bus
->dev_count
; i
++) {
3154 struct kvm_io_device
*pos
= bus
->range
[i
].dev
;
3156 kvm_iodevice_destructor(pos
);
3161 static inline int kvm_io_bus_cmp(const struct kvm_io_range
*r1
,
3162 const struct kvm_io_range
*r2
)
3164 gpa_t addr1
= r1
->addr
;
3165 gpa_t addr2
= r2
->addr
;
3170 /* If r2->len == 0, match the exact address. If r2->len != 0,
3171 * accept any overlapping write. Any order is acceptable for
3172 * overlapping ranges, because kvm_io_bus_get_first_dev ensures
3173 * we process all of them.
3186 static int kvm_io_bus_sort_cmp(const void *p1
, const void *p2
)
3188 return kvm_io_bus_cmp(p1
, p2
);
3191 static int kvm_io_bus_insert_dev(struct kvm_io_bus
*bus
, struct kvm_io_device
*dev
,
3192 gpa_t addr
, int len
)
3194 bus
->range
[bus
->dev_count
++] = (struct kvm_io_range
) {
3200 sort(bus
->range
, bus
->dev_count
, sizeof(struct kvm_io_range
),
3201 kvm_io_bus_sort_cmp
, NULL
);
3206 static int kvm_io_bus_get_first_dev(struct kvm_io_bus
*bus
,
3207 gpa_t addr
, int len
)
3209 struct kvm_io_range
*range
, key
;
3212 key
= (struct kvm_io_range
) {
3217 range
= bsearch(&key
, bus
->range
, bus
->dev_count
,
3218 sizeof(struct kvm_io_range
), kvm_io_bus_sort_cmp
);
3222 off
= range
- bus
->range
;
3224 while (off
> 0 && kvm_io_bus_cmp(&key
, &bus
->range
[off
-1]) == 0)
3230 static int __kvm_io_bus_write(struct kvm_vcpu
*vcpu
, struct kvm_io_bus
*bus
,
3231 struct kvm_io_range
*range
, const void *val
)
3235 idx
= kvm_io_bus_get_first_dev(bus
, range
->addr
, range
->len
);
3239 while (idx
< bus
->dev_count
&&
3240 kvm_io_bus_cmp(range
, &bus
->range
[idx
]) == 0) {
3241 if (!kvm_iodevice_write(vcpu
, bus
->range
[idx
].dev
, range
->addr
,
3250 /* kvm_io_bus_write - called under kvm->slots_lock */
3251 int kvm_io_bus_write(struct kvm_vcpu
*vcpu
, enum kvm_bus bus_idx
, gpa_t addr
,
3252 int len
, const void *val
)
3254 struct kvm_io_bus
*bus
;
3255 struct kvm_io_range range
;
3258 range
= (struct kvm_io_range
) {
3263 bus
= srcu_dereference(vcpu
->kvm
->buses
[bus_idx
], &vcpu
->kvm
->srcu
);
3264 r
= __kvm_io_bus_write(vcpu
, bus
, &range
, val
);
3265 return r
< 0 ? r
: 0;
3268 /* kvm_io_bus_write_cookie - called under kvm->slots_lock */
3269 int kvm_io_bus_write_cookie(struct kvm_vcpu
*vcpu
, enum kvm_bus bus_idx
,
3270 gpa_t addr
, int len
, const void *val
, long cookie
)
3272 struct kvm_io_bus
*bus
;
3273 struct kvm_io_range range
;
3275 range
= (struct kvm_io_range
) {
3280 bus
= srcu_dereference(vcpu
->kvm
->buses
[bus_idx
], &vcpu
->kvm
->srcu
);
3282 /* First try the device referenced by cookie. */
3283 if ((cookie
>= 0) && (cookie
< bus
->dev_count
) &&
3284 (kvm_io_bus_cmp(&range
, &bus
->range
[cookie
]) == 0))
3285 if (!kvm_iodevice_write(vcpu
, bus
->range
[cookie
].dev
, addr
, len
,
3290 * cookie contained garbage; fall back to search and return the
3291 * correct cookie value.
3293 return __kvm_io_bus_write(vcpu
, bus
, &range
, val
);
3296 static int __kvm_io_bus_read(struct kvm_vcpu
*vcpu
, struct kvm_io_bus
*bus
,
3297 struct kvm_io_range
*range
, void *val
)
3301 idx
= kvm_io_bus_get_first_dev(bus
, range
->addr
, range
->len
);
3305 while (idx
< bus
->dev_count
&&
3306 kvm_io_bus_cmp(range
, &bus
->range
[idx
]) == 0) {
3307 if (!kvm_iodevice_read(vcpu
, bus
->range
[idx
].dev
, range
->addr
,
3315 EXPORT_SYMBOL_GPL(kvm_io_bus_write
);
3317 /* kvm_io_bus_read - called under kvm->slots_lock */
3318 int kvm_io_bus_read(struct kvm_vcpu
*vcpu
, enum kvm_bus bus_idx
, gpa_t addr
,
3321 struct kvm_io_bus
*bus
;
3322 struct kvm_io_range range
;
3325 range
= (struct kvm_io_range
) {
3330 bus
= srcu_dereference(vcpu
->kvm
->buses
[bus_idx
], &vcpu
->kvm
->srcu
);
3331 r
= __kvm_io_bus_read(vcpu
, bus
, &range
, val
);
3332 return r
< 0 ? r
: 0;
3336 /* Caller must hold slots_lock. */
3337 int kvm_io_bus_register_dev(struct kvm
*kvm
, enum kvm_bus bus_idx
, gpa_t addr
,
3338 int len
, struct kvm_io_device
*dev
)
3340 struct kvm_io_bus
*new_bus
, *bus
;
3342 bus
= kvm
->buses
[bus_idx
];
3343 /* exclude ioeventfd which is limited by maximum fd */
3344 if (bus
->dev_count
- bus
->ioeventfd_count
> NR_IOBUS_DEVS
- 1)
3347 new_bus
= kmalloc(sizeof(*bus
) + ((bus
->dev_count
+ 1) *
3348 sizeof(struct kvm_io_range
)), GFP_KERNEL
);
3351 memcpy(new_bus
, bus
, sizeof(*bus
) + (bus
->dev_count
*
3352 sizeof(struct kvm_io_range
)));
3353 kvm_io_bus_insert_dev(new_bus
, dev
, addr
, len
);
3354 rcu_assign_pointer(kvm
->buses
[bus_idx
], new_bus
);
3355 synchronize_srcu_expedited(&kvm
->srcu
);
3361 /* Caller must hold slots_lock. */
3362 int kvm_io_bus_unregister_dev(struct kvm
*kvm
, enum kvm_bus bus_idx
,
3363 struct kvm_io_device
*dev
)
3366 struct kvm_io_bus
*new_bus
, *bus
;
3368 bus
= kvm
->buses
[bus_idx
];
3370 for (i
= 0; i
< bus
->dev_count
; i
++)
3371 if (bus
->range
[i
].dev
== dev
) {
3379 new_bus
= kmalloc(sizeof(*bus
) + ((bus
->dev_count
- 1) *
3380 sizeof(struct kvm_io_range
)), GFP_KERNEL
);
3384 memcpy(new_bus
, bus
, sizeof(*bus
) + i
* sizeof(struct kvm_io_range
));
3385 new_bus
->dev_count
--;
3386 memcpy(new_bus
->range
+ i
, bus
->range
+ i
+ 1,
3387 (new_bus
->dev_count
- i
) * sizeof(struct kvm_io_range
));
3389 rcu_assign_pointer(kvm
->buses
[bus_idx
], new_bus
);
3390 synchronize_srcu_expedited(&kvm
->srcu
);
3395 static struct notifier_block kvm_cpu_notifier
= {
3396 .notifier_call
= kvm_cpu_hotplug
,
3399 static int vm_stat_get(void *_offset
, u64
*val
)
3401 unsigned offset
= (long)_offset
;
3405 spin_lock(&kvm_lock
);
3406 list_for_each_entry(kvm
, &vm_list
, vm_list
)
3407 *val
+= *(u32
*)((void *)kvm
+ offset
);
3408 spin_unlock(&kvm_lock
);
3412 DEFINE_SIMPLE_ATTRIBUTE(vm_stat_fops
, vm_stat_get
, NULL
, "%llu\n");
3414 static int vcpu_stat_get(void *_offset
, u64
*val
)
3416 unsigned offset
= (long)_offset
;
3418 struct kvm_vcpu
*vcpu
;
3422 spin_lock(&kvm_lock
);
3423 list_for_each_entry(kvm
, &vm_list
, vm_list
)
3424 kvm_for_each_vcpu(i
, vcpu
, kvm
)
3425 *val
+= *(u32
*)((void *)vcpu
+ offset
);
3427 spin_unlock(&kvm_lock
);
3431 DEFINE_SIMPLE_ATTRIBUTE(vcpu_stat_fops
, vcpu_stat_get
, NULL
, "%llu\n");
3433 static const struct file_operations
*stat_fops
[] = {
3434 [KVM_STAT_VCPU
] = &vcpu_stat_fops
,
3435 [KVM_STAT_VM
] = &vm_stat_fops
,
3438 static int kvm_init_debug(void)
3441 struct kvm_stats_debugfs_item
*p
;
3443 kvm_debugfs_dir
= debugfs_create_dir("kvm", NULL
);
3444 if (kvm_debugfs_dir
== NULL
)
3447 for (p
= debugfs_entries
; p
->name
; ++p
) {
3448 if (!debugfs_create_file(p
->name
, 0444, kvm_debugfs_dir
,
3449 (void *)(long)p
->offset
,
3450 stat_fops
[p
->kind
]))
3457 debugfs_remove_recursive(kvm_debugfs_dir
);
3462 static int kvm_suspend(void)
3464 if (kvm_usage_count
)
3465 hardware_disable_nolock(NULL
);
3469 static void kvm_resume(void)
3471 if (kvm_usage_count
) {
3472 WARN_ON(raw_spin_is_locked(&kvm_count_lock
));
3473 hardware_enable_nolock(NULL
);
3477 static struct syscore_ops kvm_syscore_ops
= {
3478 .suspend
= kvm_suspend
,
3479 .resume
= kvm_resume
,
3483 struct kvm_vcpu
*preempt_notifier_to_vcpu(struct preempt_notifier
*pn
)
3485 return container_of(pn
, struct kvm_vcpu
, preempt_notifier
);
3488 static void kvm_sched_in(struct preempt_notifier
*pn
, int cpu
)
3490 struct kvm_vcpu
*vcpu
= preempt_notifier_to_vcpu(pn
);
3492 if (vcpu
->preempted
)
3493 vcpu
->preempted
= false;
3495 kvm_arch_sched_in(vcpu
, cpu
);
3497 kvm_arch_vcpu_load(vcpu
, cpu
);
3500 static void kvm_sched_out(struct preempt_notifier
*pn
,
3501 struct task_struct
*next
)
3503 struct kvm_vcpu
*vcpu
= preempt_notifier_to_vcpu(pn
);
3505 if (current
->state
== TASK_RUNNING
)
3506 vcpu
->preempted
= true;
3507 kvm_arch_vcpu_put(vcpu
);
3510 int kvm_init(void *opaque
, unsigned vcpu_size
, unsigned vcpu_align
,
3511 struct module
*module
)
3516 r
= kvm_arch_init(opaque
);
3521 * kvm_arch_init makes sure there's at most one caller
3522 * for architectures that support multiple implementations,
3523 * like intel and amd on x86.
3524 * kvm_arch_init must be called before kvm_irqfd_init to avoid creating
3525 * conflicts in case kvm is already setup for another implementation.
3527 r
= kvm_irqfd_init();
3531 if (!zalloc_cpumask_var(&cpus_hardware_enabled
, GFP_KERNEL
)) {
3536 r
= kvm_arch_hardware_setup();
3540 for_each_online_cpu(cpu
) {
3541 smp_call_function_single(cpu
,
3542 kvm_arch_check_processor_compat
,
3548 r
= register_cpu_notifier(&kvm_cpu_notifier
);
3551 register_reboot_notifier(&kvm_reboot_notifier
);
3553 /* A kmem cache lets us meet the alignment requirements of fx_save. */
3555 vcpu_align
= __alignof__(struct kvm_vcpu
);
3556 kvm_vcpu_cache
= kmem_cache_create("kvm_vcpu", vcpu_size
, vcpu_align
,
3558 if (!kvm_vcpu_cache
) {
3563 r
= kvm_async_pf_init();
3567 kvm_chardev_ops
.owner
= module
;
3568 kvm_vm_fops
.owner
= module
;
3569 kvm_vcpu_fops
.owner
= module
;
3571 r
= misc_register(&kvm_dev
);
3573 pr_err("kvm: misc device register failed\n");
3577 register_syscore_ops(&kvm_syscore_ops
);
3579 kvm_preempt_ops
.sched_in
= kvm_sched_in
;
3580 kvm_preempt_ops
.sched_out
= kvm_sched_out
;
3582 r
= kvm_init_debug();
3584 pr_err("kvm: create debugfs files failed\n");
3588 r
= kvm_vfio_ops_init();
3594 unregister_syscore_ops(&kvm_syscore_ops
);
3595 misc_deregister(&kvm_dev
);
3597 kvm_async_pf_deinit();
3599 kmem_cache_destroy(kvm_vcpu_cache
);
3601 unregister_reboot_notifier(&kvm_reboot_notifier
);
3602 unregister_cpu_notifier(&kvm_cpu_notifier
);
3605 kvm_arch_hardware_unsetup();
3607 free_cpumask_var(cpus_hardware_enabled
);
3615 EXPORT_SYMBOL_GPL(kvm_init
);
3619 debugfs_remove_recursive(kvm_debugfs_dir
);
3620 misc_deregister(&kvm_dev
);
3621 kmem_cache_destroy(kvm_vcpu_cache
);
3622 kvm_async_pf_deinit();
3623 unregister_syscore_ops(&kvm_syscore_ops
);
3624 unregister_reboot_notifier(&kvm_reboot_notifier
);
3625 unregister_cpu_notifier(&kvm_cpu_notifier
);
3626 on_each_cpu(hardware_disable_nolock
, NULL
, 1);
3627 kvm_arch_hardware_unsetup();
3630 free_cpumask_var(cpus_hardware_enabled
);
3631 kvm_vfio_ops_exit();
3633 EXPORT_SYMBOL_GPL(kvm_exit
);