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
, int, S_IRUGO
);
77 /* Default resets per-vcpu halt_poll_ns . */
78 static unsigned int halt_poll_ns_shrink
;
79 module_param(halt_poll_ns_shrink
, int, S_IRUGO
);
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(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(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 vcpu
->halt_poll_ns
= 0;
220 init_waitqueue_head(&vcpu
->wq
);
221 kvm_async_pf_vcpu_init(vcpu
);
224 INIT_LIST_HEAD(&vcpu
->blocked_vcpu_list
);
226 page
= alloc_page(GFP_KERNEL
| __GFP_ZERO
);
231 vcpu
->run
= page_address(page
);
233 kvm_vcpu_set_in_spin_loop(vcpu
, false);
234 kvm_vcpu_set_dy_eligible(vcpu
, false);
235 vcpu
->preempted
= false;
237 r
= kvm_arch_vcpu_init(vcpu
);
243 free_page((unsigned long)vcpu
->run
);
247 EXPORT_SYMBOL_GPL(kvm_vcpu_init
);
249 void kvm_vcpu_uninit(struct kvm_vcpu
*vcpu
)
252 kvm_arch_vcpu_uninit(vcpu
);
253 free_page((unsigned long)vcpu
->run
);
255 EXPORT_SYMBOL_GPL(kvm_vcpu_uninit
);
257 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
258 static inline struct kvm
*mmu_notifier_to_kvm(struct mmu_notifier
*mn
)
260 return container_of(mn
, struct kvm
, mmu_notifier
);
263 static void kvm_mmu_notifier_invalidate_page(struct mmu_notifier
*mn
,
264 struct mm_struct
*mm
,
265 unsigned long address
)
267 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
268 int need_tlb_flush
, idx
;
271 * When ->invalidate_page runs, the linux pte has been zapped
272 * already but the page is still allocated until
273 * ->invalidate_page returns. So if we increase the sequence
274 * here the kvm page fault will notice if the spte can't be
275 * established because the page is going to be freed. If
276 * instead the kvm page fault establishes the spte before
277 * ->invalidate_page runs, kvm_unmap_hva will release it
280 * The sequence increase only need to be seen at spin_unlock
281 * time, and not at spin_lock time.
283 * Increasing the sequence after the spin_unlock would be
284 * unsafe because the kvm page fault could then establish the
285 * pte after kvm_unmap_hva returned, without noticing the page
286 * is going to be freed.
288 idx
= srcu_read_lock(&kvm
->srcu
);
289 spin_lock(&kvm
->mmu_lock
);
291 kvm
->mmu_notifier_seq
++;
292 need_tlb_flush
= kvm_unmap_hva(kvm
, address
) | kvm
->tlbs_dirty
;
293 /* we've to flush the tlb before the pages can be freed */
295 kvm_flush_remote_tlbs(kvm
);
297 spin_unlock(&kvm
->mmu_lock
);
299 kvm_arch_mmu_notifier_invalidate_page(kvm
, address
);
301 srcu_read_unlock(&kvm
->srcu
, idx
);
304 static void kvm_mmu_notifier_change_pte(struct mmu_notifier
*mn
,
305 struct mm_struct
*mm
,
306 unsigned long address
,
309 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
312 idx
= srcu_read_lock(&kvm
->srcu
);
313 spin_lock(&kvm
->mmu_lock
);
314 kvm
->mmu_notifier_seq
++;
315 kvm_set_spte_hva(kvm
, address
, pte
);
316 spin_unlock(&kvm
->mmu_lock
);
317 srcu_read_unlock(&kvm
->srcu
, idx
);
320 static void kvm_mmu_notifier_invalidate_range_start(struct mmu_notifier
*mn
,
321 struct mm_struct
*mm
,
325 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
326 int need_tlb_flush
= 0, idx
;
328 idx
= srcu_read_lock(&kvm
->srcu
);
329 spin_lock(&kvm
->mmu_lock
);
331 * The count increase must become visible at unlock time as no
332 * spte can be established without taking the mmu_lock and
333 * count is also read inside the mmu_lock critical section.
335 kvm
->mmu_notifier_count
++;
336 need_tlb_flush
= kvm_unmap_hva_range(kvm
, start
, end
);
337 need_tlb_flush
|= kvm
->tlbs_dirty
;
338 /* we've to flush the tlb before the pages can be freed */
340 kvm_flush_remote_tlbs(kvm
);
342 spin_unlock(&kvm
->mmu_lock
);
343 srcu_read_unlock(&kvm
->srcu
, idx
);
346 static void kvm_mmu_notifier_invalidate_range_end(struct mmu_notifier
*mn
,
347 struct mm_struct
*mm
,
351 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
353 spin_lock(&kvm
->mmu_lock
);
355 * This sequence increase will notify the kvm page fault that
356 * the page that is going to be mapped in the spte could have
359 kvm
->mmu_notifier_seq
++;
362 * The above sequence increase must be visible before the
363 * below count decrease, which is ensured by the smp_wmb above
364 * in conjunction with the smp_rmb in mmu_notifier_retry().
366 kvm
->mmu_notifier_count
--;
367 spin_unlock(&kvm
->mmu_lock
);
369 BUG_ON(kvm
->mmu_notifier_count
< 0);
372 static int kvm_mmu_notifier_clear_flush_young(struct mmu_notifier
*mn
,
373 struct mm_struct
*mm
,
377 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
380 idx
= srcu_read_lock(&kvm
->srcu
);
381 spin_lock(&kvm
->mmu_lock
);
383 young
= kvm_age_hva(kvm
, start
, end
);
385 kvm_flush_remote_tlbs(kvm
);
387 spin_unlock(&kvm
->mmu_lock
);
388 srcu_read_unlock(&kvm
->srcu
, idx
);
393 static int kvm_mmu_notifier_clear_young(struct mmu_notifier
*mn
,
394 struct mm_struct
*mm
,
398 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
401 idx
= srcu_read_lock(&kvm
->srcu
);
402 spin_lock(&kvm
->mmu_lock
);
404 * Even though we do not flush TLB, this will still adversely
405 * affect performance on pre-Haswell Intel EPT, where there is
406 * no EPT Access Bit to clear so that we have to tear down EPT
407 * tables instead. If we find this unacceptable, we can always
408 * add a parameter to kvm_age_hva so that it effectively doesn't
409 * do anything on clear_young.
411 * Also note that currently we never issue secondary TLB flushes
412 * from clear_young, leaving this job up to the regular system
413 * cadence. If we find this inaccurate, we might come up with a
414 * more sophisticated heuristic later.
416 young
= kvm_age_hva(kvm
, start
, end
);
417 spin_unlock(&kvm
->mmu_lock
);
418 srcu_read_unlock(&kvm
->srcu
, idx
);
423 static int kvm_mmu_notifier_test_young(struct mmu_notifier
*mn
,
424 struct mm_struct
*mm
,
425 unsigned long address
)
427 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
430 idx
= srcu_read_lock(&kvm
->srcu
);
431 spin_lock(&kvm
->mmu_lock
);
432 young
= kvm_test_age_hva(kvm
, address
);
433 spin_unlock(&kvm
->mmu_lock
);
434 srcu_read_unlock(&kvm
->srcu
, idx
);
439 static void kvm_mmu_notifier_release(struct mmu_notifier
*mn
,
440 struct mm_struct
*mm
)
442 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
445 idx
= srcu_read_lock(&kvm
->srcu
);
446 kvm_arch_flush_shadow_all(kvm
);
447 srcu_read_unlock(&kvm
->srcu
, idx
);
450 static const struct mmu_notifier_ops kvm_mmu_notifier_ops
= {
451 .invalidate_page
= kvm_mmu_notifier_invalidate_page
,
452 .invalidate_range_start
= kvm_mmu_notifier_invalidate_range_start
,
453 .invalidate_range_end
= kvm_mmu_notifier_invalidate_range_end
,
454 .clear_flush_young
= kvm_mmu_notifier_clear_flush_young
,
455 .clear_young
= kvm_mmu_notifier_clear_young
,
456 .test_young
= kvm_mmu_notifier_test_young
,
457 .change_pte
= kvm_mmu_notifier_change_pte
,
458 .release
= kvm_mmu_notifier_release
,
461 static int kvm_init_mmu_notifier(struct kvm
*kvm
)
463 kvm
->mmu_notifier
.ops
= &kvm_mmu_notifier_ops
;
464 return mmu_notifier_register(&kvm
->mmu_notifier
, current
->mm
);
467 #else /* !(CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER) */
469 static int kvm_init_mmu_notifier(struct kvm
*kvm
)
474 #endif /* CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER */
476 static struct kvm_memslots
*kvm_alloc_memslots(void)
479 struct kvm_memslots
*slots
;
481 slots
= kvm_kvzalloc(sizeof(struct kvm_memslots
));
486 * Init kvm generation close to the maximum to easily test the
487 * code of handling generation number wrap-around.
489 slots
->generation
= -150;
490 for (i
= 0; i
< KVM_MEM_SLOTS_NUM
; i
++)
491 slots
->id_to_index
[i
] = slots
->memslots
[i
].id
= i
;
496 static void kvm_destroy_dirty_bitmap(struct kvm_memory_slot
*memslot
)
498 if (!memslot
->dirty_bitmap
)
501 kvfree(memslot
->dirty_bitmap
);
502 memslot
->dirty_bitmap
= NULL
;
506 * Free any memory in @free but not in @dont.
508 static void kvm_free_memslot(struct kvm
*kvm
, struct kvm_memory_slot
*free
,
509 struct kvm_memory_slot
*dont
)
511 if (!dont
|| free
->dirty_bitmap
!= dont
->dirty_bitmap
)
512 kvm_destroy_dirty_bitmap(free
);
514 kvm_arch_free_memslot(kvm
, free
, dont
);
519 static void kvm_free_memslots(struct kvm
*kvm
, struct kvm_memslots
*slots
)
521 struct kvm_memory_slot
*memslot
;
526 kvm_for_each_memslot(memslot
, slots
)
527 kvm_free_memslot(kvm
, memslot
, NULL
);
532 static struct kvm
*kvm_create_vm(unsigned long type
)
535 struct kvm
*kvm
= kvm_arch_alloc_vm();
538 return ERR_PTR(-ENOMEM
);
540 r
= kvm_arch_init_vm(kvm
, type
);
542 goto out_err_no_disable
;
544 r
= hardware_enable_all();
546 goto out_err_no_disable
;
548 #ifdef CONFIG_HAVE_KVM_IRQFD
549 INIT_HLIST_HEAD(&kvm
->irq_ack_notifier_list
);
552 BUILD_BUG_ON(KVM_MEM_SLOTS_NUM
> SHRT_MAX
);
555 for (i
= 0; i
< KVM_ADDRESS_SPACE_NUM
; i
++) {
556 kvm
->memslots
[i
] = kvm_alloc_memslots();
557 if (!kvm
->memslots
[i
])
558 goto out_err_no_srcu
;
561 if (init_srcu_struct(&kvm
->srcu
))
562 goto out_err_no_srcu
;
563 if (init_srcu_struct(&kvm
->irq_srcu
))
564 goto out_err_no_irq_srcu
;
565 for (i
= 0; i
< KVM_NR_BUSES
; i
++) {
566 kvm
->buses
[i
] = kzalloc(sizeof(struct kvm_io_bus
),
572 spin_lock_init(&kvm
->mmu_lock
);
573 kvm
->mm
= current
->mm
;
574 atomic_inc(&kvm
->mm
->mm_count
);
575 kvm_eventfd_init(kvm
);
576 mutex_init(&kvm
->lock
);
577 mutex_init(&kvm
->irq_lock
);
578 mutex_init(&kvm
->slots_lock
);
579 atomic_set(&kvm
->users_count
, 1);
580 INIT_LIST_HEAD(&kvm
->devices
);
582 r
= kvm_init_mmu_notifier(kvm
);
586 spin_lock(&kvm_lock
);
587 list_add(&kvm
->vm_list
, &vm_list
);
588 spin_unlock(&kvm_lock
);
590 preempt_notifier_inc();
595 cleanup_srcu_struct(&kvm
->irq_srcu
);
597 cleanup_srcu_struct(&kvm
->srcu
);
599 hardware_disable_all();
601 for (i
= 0; i
< KVM_NR_BUSES
; i
++)
602 kfree(kvm
->buses
[i
]);
603 for (i
= 0; i
< KVM_ADDRESS_SPACE_NUM
; i
++)
604 kvm_free_memslots(kvm
, kvm
->memslots
[i
]);
605 kvm_arch_free_vm(kvm
);
610 * Avoid using vmalloc for a small buffer.
611 * Should not be used when the size is statically known.
613 void *kvm_kvzalloc(unsigned long size
)
615 if (size
> PAGE_SIZE
)
616 return vzalloc(size
);
618 return kzalloc(size
, GFP_KERNEL
);
621 static void kvm_destroy_devices(struct kvm
*kvm
)
623 struct list_head
*node
, *tmp
;
625 list_for_each_safe(node
, tmp
, &kvm
->devices
) {
626 struct kvm_device
*dev
=
627 list_entry(node
, struct kvm_device
, vm_node
);
630 dev
->ops
->destroy(dev
);
634 static void kvm_destroy_vm(struct kvm
*kvm
)
637 struct mm_struct
*mm
= kvm
->mm
;
639 kvm_arch_sync_events(kvm
);
640 spin_lock(&kvm_lock
);
641 list_del(&kvm
->vm_list
);
642 spin_unlock(&kvm_lock
);
643 kvm_free_irq_routing(kvm
);
644 for (i
= 0; i
< KVM_NR_BUSES
; i
++)
645 kvm_io_bus_destroy(kvm
->buses
[i
]);
646 kvm_coalesced_mmio_free(kvm
);
647 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
648 mmu_notifier_unregister(&kvm
->mmu_notifier
, kvm
->mm
);
650 kvm_arch_flush_shadow_all(kvm
);
652 kvm_arch_destroy_vm(kvm
);
653 kvm_destroy_devices(kvm
);
654 for (i
= 0; i
< KVM_ADDRESS_SPACE_NUM
; i
++)
655 kvm_free_memslots(kvm
, kvm
->memslots
[i
]);
656 cleanup_srcu_struct(&kvm
->irq_srcu
);
657 cleanup_srcu_struct(&kvm
->srcu
);
658 kvm_arch_free_vm(kvm
);
659 preempt_notifier_dec();
660 hardware_disable_all();
664 void kvm_get_kvm(struct kvm
*kvm
)
666 atomic_inc(&kvm
->users_count
);
668 EXPORT_SYMBOL_GPL(kvm_get_kvm
);
670 void kvm_put_kvm(struct kvm
*kvm
)
672 if (atomic_dec_and_test(&kvm
->users_count
))
675 EXPORT_SYMBOL_GPL(kvm_put_kvm
);
678 static int kvm_vm_release(struct inode
*inode
, struct file
*filp
)
680 struct kvm
*kvm
= filp
->private_data
;
682 kvm_irqfd_release(kvm
);
689 * Allocation size is twice as large as the actual dirty bitmap size.
690 * See x86's kvm_vm_ioctl_get_dirty_log() why this is needed.
692 static int kvm_create_dirty_bitmap(struct kvm_memory_slot
*memslot
)
694 unsigned long dirty_bytes
= 2 * kvm_dirty_bitmap_bytes(memslot
);
696 memslot
->dirty_bitmap
= kvm_kvzalloc(dirty_bytes
);
697 if (!memslot
->dirty_bitmap
)
704 * Insert memslot and re-sort memslots based on their GFN,
705 * so binary search could be used to lookup GFN.
706 * Sorting algorithm takes advantage of having initially
707 * sorted array and known changed memslot position.
709 static void update_memslots(struct kvm_memslots
*slots
,
710 struct kvm_memory_slot
*new)
713 int i
= slots
->id_to_index
[id
];
714 struct kvm_memory_slot
*mslots
= slots
->memslots
;
716 WARN_ON(mslots
[i
].id
!= id
);
718 WARN_ON(!mslots
[i
].npages
);
719 if (mslots
[i
].npages
)
722 if (!mslots
[i
].npages
)
726 while (i
< KVM_MEM_SLOTS_NUM
- 1 &&
727 new->base_gfn
<= mslots
[i
+ 1].base_gfn
) {
728 if (!mslots
[i
+ 1].npages
)
730 mslots
[i
] = mslots
[i
+ 1];
731 slots
->id_to_index
[mslots
[i
].id
] = i
;
736 * The ">=" is needed when creating a slot with base_gfn == 0,
737 * so that it moves before all those with base_gfn == npages == 0.
739 * On the other hand, if new->npages is zero, the above loop has
740 * already left i pointing to the beginning of the empty part of
741 * mslots, and the ">=" would move the hole backwards in this
742 * case---which is wrong. So skip the loop when deleting a slot.
746 new->base_gfn
>= mslots
[i
- 1].base_gfn
) {
747 mslots
[i
] = mslots
[i
- 1];
748 slots
->id_to_index
[mslots
[i
].id
] = i
;
752 WARN_ON_ONCE(i
!= slots
->used_slots
);
755 slots
->id_to_index
[mslots
[i
].id
] = i
;
758 static int check_memory_region_flags(const struct kvm_userspace_memory_region
*mem
)
760 u32 valid_flags
= KVM_MEM_LOG_DIRTY_PAGES
;
762 #ifdef __KVM_HAVE_READONLY_MEM
763 valid_flags
|= KVM_MEM_READONLY
;
766 if (mem
->flags
& ~valid_flags
)
772 static struct kvm_memslots
*install_new_memslots(struct kvm
*kvm
,
773 int as_id
, struct kvm_memslots
*slots
)
775 struct kvm_memslots
*old_memslots
= __kvm_memslots(kvm
, as_id
);
778 * Set the low bit in the generation, which disables SPTE caching
779 * until the end of synchronize_srcu_expedited.
781 WARN_ON(old_memslots
->generation
& 1);
782 slots
->generation
= old_memslots
->generation
+ 1;
784 rcu_assign_pointer(kvm
->memslots
[as_id
], slots
);
785 synchronize_srcu_expedited(&kvm
->srcu
);
788 * Increment the new memslot generation a second time. This prevents
789 * vm exits that race with memslot updates from caching a memslot
790 * generation that will (potentially) be valid forever.
794 kvm_arch_memslots_updated(kvm
, slots
);
800 * Allocate some memory and give it an address in the guest physical address
803 * Discontiguous memory is allowed, mostly for framebuffers.
805 * Must be called holding kvm->slots_lock for write.
807 int __kvm_set_memory_region(struct kvm
*kvm
,
808 const struct kvm_userspace_memory_region
*mem
)
812 unsigned long npages
;
813 struct kvm_memory_slot
*slot
;
814 struct kvm_memory_slot old
, new;
815 struct kvm_memslots
*slots
= NULL
, *old_memslots
;
817 enum kvm_mr_change change
;
819 r
= check_memory_region_flags(mem
);
824 as_id
= mem
->slot
>> 16;
827 /* General sanity checks */
828 if (mem
->memory_size
& (PAGE_SIZE
- 1))
830 if (mem
->guest_phys_addr
& (PAGE_SIZE
- 1))
832 /* We can read the guest memory with __xxx_user() later on. */
833 if ((id
< KVM_USER_MEM_SLOTS
) &&
834 ((mem
->userspace_addr
& (PAGE_SIZE
- 1)) ||
835 !access_ok(VERIFY_WRITE
,
836 (void __user
*)(unsigned long)mem
->userspace_addr
,
839 if (as_id
>= KVM_ADDRESS_SPACE_NUM
|| id
>= KVM_MEM_SLOTS_NUM
)
841 if (mem
->guest_phys_addr
+ mem
->memory_size
< mem
->guest_phys_addr
)
844 slot
= id_to_memslot(__kvm_memslots(kvm
, as_id
), id
);
845 base_gfn
= mem
->guest_phys_addr
>> PAGE_SHIFT
;
846 npages
= mem
->memory_size
>> PAGE_SHIFT
;
848 if (npages
> KVM_MEM_MAX_NR_PAGES
)
854 new.base_gfn
= base_gfn
;
856 new.flags
= mem
->flags
;
860 change
= KVM_MR_CREATE
;
861 else { /* Modify an existing slot. */
862 if ((mem
->userspace_addr
!= old
.userspace_addr
) ||
863 (npages
!= old
.npages
) ||
864 ((new.flags
^ old
.flags
) & KVM_MEM_READONLY
))
867 if (base_gfn
!= old
.base_gfn
)
868 change
= KVM_MR_MOVE
;
869 else if (new.flags
!= old
.flags
)
870 change
= KVM_MR_FLAGS_ONLY
;
871 else { /* Nothing to change. */
880 change
= KVM_MR_DELETE
;
885 if ((change
== KVM_MR_CREATE
) || (change
== KVM_MR_MOVE
)) {
886 /* Check for overlaps */
888 kvm_for_each_memslot(slot
, __kvm_memslots(kvm
, as_id
)) {
889 if ((slot
->id
>= KVM_USER_MEM_SLOTS
) ||
892 if (!((base_gfn
+ npages
<= slot
->base_gfn
) ||
893 (base_gfn
>= slot
->base_gfn
+ slot
->npages
)))
898 /* Free page dirty bitmap if unneeded */
899 if (!(new.flags
& KVM_MEM_LOG_DIRTY_PAGES
))
900 new.dirty_bitmap
= NULL
;
903 if (change
== KVM_MR_CREATE
) {
904 new.userspace_addr
= mem
->userspace_addr
;
906 if (kvm_arch_create_memslot(kvm
, &new, npages
))
910 /* Allocate page dirty bitmap if needed */
911 if ((new.flags
& KVM_MEM_LOG_DIRTY_PAGES
) && !new.dirty_bitmap
) {
912 if (kvm_create_dirty_bitmap(&new) < 0)
916 slots
= kvm_kvzalloc(sizeof(struct kvm_memslots
));
919 memcpy(slots
, __kvm_memslots(kvm
, as_id
), sizeof(struct kvm_memslots
));
921 if ((change
== KVM_MR_DELETE
) || (change
== KVM_MR_MOVE
)) {
922 slot
= id_to_memslot(slots
, id
);
923 slot
->flags
|= KVM_MEMSLOT_INVALID
;
925 old_memslots
= install_new_memslots(kvm
, as_id
, slots
);
927 /* slot was deleted or moved, clear iommu mapping */
928 kvm_iommu_unmap_pages(kvm
, &old
);
929 /* From this point no new shadow pages pointing to a deleted,
930 * or moved, memslot will be created.
932 * validation of sp->gfn happens in:
933 * - gfn_to_hva (kvm_read_guest, gfn_to_pfn)
934 * - kvm_is_visible_gfn (mmu_check_roots)
936 kvm_arch_flush_shadow_memslot(kvm
, slot
);
939 * We can re-use the old_memslots from above, the only difference
940 * from the currently installed memslots is the invalid flag. This
941 * will get overwritten by update_memslots anyway.
943 slots
= old_memslots
;
946 r
= kvm_arch_prepare_memory_region(kvm
, &new, mem
, change
);
950 /* actual memory is freed via old in kvm_free_memslot below */
951 if (change
== KVM_MR_DELETE
) {
952 new.dirty_bitmap
= NULL
;
953 memset(&new.arch
, 0, sizeof(new.arch
));
956 update_memslots(slots
, &new);
957 old_memslots
= install_new_memslots(kvm
, as_id
, slots
);
959 kvm_arch_commit_memory_region(kvm
, mem
, &old
, &new, change
);
961 kvm_free_memslot(kvm
, &old
, &new);
962 kvfree(old_memslots
);
965 * IOMMU mapping: New slots need to be mapped. Old slots need to be
966 * un-mapped and re-mapped if their base changes. Since base change
967 * unmapping is handled above with slot deletion, mapping alone is
968 * needed here. Anything else the iommu might care about for existing
969 * slots (size changes, userspace addr changes and read-only flag
970 * changes) is disallowed above, so any other attribute changes getting
971 * here can be skipped.
973 if ((change
== KVM_MR_CREATE
) || (change
== KVM_MR_MOVE
)) {
974 r
= kvm_iommu_map_pages(kvm
, &new);
983 kvm_free_memslot(kvm
, &new, &old
);
987 EXPORT_SYMBOL_GPL(__kvm_set_memory_region
);
989 int kvm_set_memory_region(struct kvm
*kvm
,
990 const struct kvm_userspace_memory_region
*mem
)
994 mutex_lock(&kvm
->slots_lock
);
995 r
= __kvm_set_memory_region(kvm
, mem
);
996 mutex_unlock(&kvm
->slots_lock
);
999 EXPORT_SYMBOL_GPL(kvm_set_memory_region
);
1001 static int kvm_vm_ioctl_set_memory_region(struct kvm
*kvm
,
1002 struct kvm_userspace_memory_region
*mem
)
1004 if ((u16
)mem
->slot
>= KVM_USER_MEM_SLOTS
)
1007 return kvm_set_memory_region(kvm
, mem
);
1010 int kvm_get_dirty_log(struct kvm
*kvm
,
1011 struct kvm_dirty_log
*log
, int *is_dirty
)
1013 struct kvm_memslots
*slots
;
1014 struct kvm_memory_slot
*memslot
;
1015 int r
, i
, as_id
, id
;
1017 unsigned long any
= 0;
1020 as_id
= log
->slot
>> 16;
1021 id
= (u16
)log
->slot
;
1022 if (as_id
>= KVM_ADDRESS_SPACE_NUM
|| id
>= KVM_USER_MEM_SLOTS
)
1025 slots
= __kvm_memslots(kvm
, as_id
);
1026 memslot
= id_to_memslot(slots
, id
);
1028 if (!memslot
->dirty_bitmap
)
1031 n
= kvm_dirty_bitmap_bytes(memslot
);
1033 for (i
= 0; !any
&& i
< n
/sizeof(long); ++i
)
1034 any
= memslot
->dirty_bitmap
[i
];
1037 if (copy_to_user(log
->dirty_bitmap
, memslot
->dirty_bitmap
, n
))
1047 EXPORT_SYMBOL_GPL(kvm_get_dirty_log
);
1049 #ifdef CONFIG_KVM_GENERIC_DIRTYLOG_READ_PROTECT
1051 * kvm_get_dirty_log_protect - get a snapshot of dirty pages, and if any pages
1052 * are dirty write protect them for next write.
1053 * @kvm: pointer to kvm instance
1054 * @log: slot id and address to which we copy the log
1055 * @is_dirty: flag set if any page is dirty
1057 * We need to keep it in mind that VCPU threads can write to the bitmap
1058 * concurrently. So, to avoid losing track of dirty pages we keep the
1061 * 1. Take a snapshot of the bit and clear it if needed.
1062 * 2. Write protect the corresponding page.
1063 * 3. Copy the snapshot to the userspace.
1064 * 4. Upon return caller flushes TLB's if needed.
1066 * Between 2 and 4, the guest may write to the page using the remaining TLB
1067 * entry. This is not a problem because the page is reported dirty using
1068 * the snapshot taken before and step 4 ensures that writes done after
1069 * exiting to userspace will be logged for the next call.
1072 int kvm_get_dirty_log_protect(struct kvm
*kvm
,
1073 struct kvm_dirty_log
*log
, bool *is_dirty
)
1075 struct kvm_memslots
*slots
;
1076 struct kvm_memory_slot
*memslot
;
1077 int r
, i
, as_id
, id
;
1079 unsigned long *dirty_bitmap
;
1080 unsigned long *dirty_bitmap_buffer
;
1083 as_id
= log
->slot
>> 16;
1084 id
= (u16
)log
->slot
;
1085 if (as_id
>= KVM_ADDRESS_SPACE_NUM
|| id
>= KVM_USER_MEM_SLOTS
)
1088 slots
= __kvm_memslots(kvm
, as_id
);
1089 memslot
= id_to_memslot(slots
, id
);
1091 dirty_bitmap
= memslot
->dirty_bitmap
;
1096 n
= kvm_dirty_bitmap_bytes(memslot
);
1098 dirty_bitmap_buffer
= dirty_bitmap
+ n
/ sizeof(long);
1099 memset(dirty_bitmap_buffer
, 0, n
);
1101 spin_lock(&kvm
->mmu_lock
);
1103 for (i
= 0; i
< n
/ sizeof(long); i
++) {
1107 if (!dirty_bitmap
[i
])
1112 mask
= xchg(&dirty_bitmap
[i
], 0);
1113 dirty_bitmap_buffer
[i
] = mask
;
1116 offset
= i
* BITS_PER_LONG
;
1117 kvm_arch_mmu_enable_log_dirty_pt_masked(kvm
, memslot
,
1122 spin_unlock(&kvm
->mmu_lock
);
1125 if (copy_to_user(log
->dirty_bitmap
, dirty_bitmap_buffer
, n
))
1132 EXPORT_SYMBOL_GPL(kvm_get_dirty_log_protect
);
1135 bool kvm_largepages_enabled(void)
1137 return largepages_enabled
;
1140 void kvm_disable_largepages(void)
1142 largepages_enabled
= false;
1144 EXPORT_SYMBOL_GPL(kvm_disable_largepages
);
1146 struct kvm_memory_slot
*gfn_to_memslot(struct kvm
*kvm
, gfn_t gfn
)
1148 return __gfn_to_memslot(kvm_memslots(kvm
), gfn
);
1150 EXPORT_SYMBOL_GPL(gfn_to_memslot
);
1152 struct kvm_memory_slot
*kvm_vcpu_gfn_to_memslot(struct kvm_vcpu
*vcpu
, gfn_t gfn
)
1154 return __gfn_to_memslot(kvm_vcpu_memslots(vcpu
), gfn
);
1157 bool kvm_is_visible_gfn(struct kvm
*kvm
, gfn_t gfn
)
1159 struct kvm_memory_slot
*memslot
= gfn_to_memslot(kvm
, gfn
);
1161 if (!memslot
|| memslot
->id
>= KVM_USER_MEM_SLOTS
||
1162 memslot
->flags
& KVM_MEMSLOT_INVALID
)
1167 EXPORT_SYMBOL_GPL(kvm_is_visible_gfn
);
1169 unsigned long kvm_host_page_size(struct kvm
*kvm
, gfn_t gfn
)
1171 struct vm_area_struct
*vma
;
1172 unsigned long addr
, size
;
1176 addr
= gfn_to_hva(kvm
, gfn
);
1177 if (kvm_is_error_hva(addr
))
1180 down_read(¤t
->mm
->mmap_sem
);
1181 vma
= find_vma(current
->mm
, addr
);
1185 size
= vma_kernel_pagesize(vma
);
1188 up_read(¤t
->mm
->mmap_sem
);
1193 static bool memslot_is_readonly(struct kvm_memory_slot
*slot
)
1195 return slot
->flags
& KVM_MEM_READONLY
;
1198 static unsigned long __gfn_to_hva_many(struct kvm_memory_slot
*slot
, gfn_t gfn
,
1199 gfn_t
*nr_pages
, bool write
)
1201 if (!slot
|| slot
->flags
& KVM_MEMSLOT_INVALID
)
1202 return KVM_HVA_ERR_BAD
;
1204 if (memslot_is_readonly(slot
) && write
)
1205 return KVM_HVA_ERR_RO_BAD
;
1208 *nr_pages
= slot
->npages
- (gfn
- slot
->base_gfn
);
1210 return __gfn_to_hva_memslot(slot
, gfn
);
1213 static unsigned long gfn_to_hva_many(struct kvm_memory_slot
*slot
, gfn_t gfn
,
1216 return __gfn_to_hva_many(slot
, gfn
, nr_pages
, true);
1219 unsigned long gfn_to_hva_memslot(struct kvm_memory_slot
*slot
,
1222 return gfn_to_hva_many(slot
, gfn
, NULL
);
1224 EXPORT_SYMBOL_GPL(gfn_to_hva_memslot
);
1226 unsigned long gfn_to_hva(struct kvm
*kvm
, gfn_t gfn
)
1228 return gfn_to_hva_many(gfn_to_memslot(kvm
, gfn
), gfn
, NULL
);
1230 EXPORT_SYMBOL_GPL(gfn_to_hva
);
1232 unsigned long kvm_vcpu_gfn_to_hva(struct kvm_vcpu
*vcpu
, gfn_t gfn
)
1234 return gfn_to_hva_many(kvm_vcpu_gfn_to_memslot(vcpu
, gfn
), gfn
, NULL
);
1236 EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_hva
);
1239 * If writable is set to false, the hva returned by this function is only
1240 * allowed to be read.
1242 unsigned long gfn_to_hva_memslot_prot(struct kvm_memory_slot
*slot
,
1243 gfn_t gfn
, bool *writable
)
1245 unsigned long hva
= __gfn_to_hva_many(slot
, gfn
, NULL
, false);
1247 if (!kvm_is_error_hva(hva
) && writable
)
1248 *writable
= !memslot_is_readonly(slot
);
1253 unsigned long gfn_to_hva_prot(struct kvm
*kvm
, gfn_t gfn
, bool *writable
)
1255 struct kvm_memory_slot
*slot
= gfn_to_memslot(kvm
, gfn
);
1257 return gfn_to_hva_memslot_prot(slot
, gfn
, writable
);
1260 unsigned long kvm_vcpu_gfn_to_hva_prot(struct kvm_vcpu
*vcpu
, gfn_t gfn
, bool *writable
)
1262 struct kvm_memory_slot
*slot
= kvm_vcpu_gfn_to_memslot(vcpu
, gfn
);
1264 return gfn_to_hva_memslot_prot(slot
, gfn
, writable
);
1267 static int get_user_page_nowait(struct task_struct
*tsk
, struct mm_struct
*mm
,
1268 unsigned long start
, int write
, struct page
**page
)
1270 int flags
= FOLL_TOUCH
| FOLL_NOWAIT
| FOLL_HWPOISON
| FOLL_GET
;
1273 flags
|= FOLL_WRITE
;
1275 return __get_user_pages(tsk
, mm
, start
, 1, flags
, page
, NULL
, NULL
);
1278 static inline int check_user_page_hwpoison(unsigned long addr
)
1280 int rc
, flags
= FOLL_TOUCH
| FOLL_HWPOISON
| FOLL_WRITE
;
1282 rc
= __get_user_pages(current
, current
->mm
, addr
, 1,
1283 flags
, NULL
, NULL
, NULL
);
1284 return rc
== -EHWPOISON
;
1288 * The atomic path to get the writable pfn which will be stored in @pfn,
1289 * true indicates success, otherwise false is returned.
1291 static bool hva_to_pfn_fast(unsigned long addr
, bool atomic
, bool *async
,
1292 bool write_fault
, bool *writable
, pfn_t
*pfn
)
1294 struct page
*page
[1];
1297 if (!(async
|| atomic
))
1301 * Fast pin a writable pfn only if it is a write fault request
1302 * or the caller allows to map a writable pfn for a read fault
1305 if (!(write_fault
|| writable
))
1308 npages
= __get_user_pages_fast(addr
, 1, 1, page
);
1310 *pfn
= page_to_pfn(page
[0]);
1321 * The slow path to get the pfn of the specified host virtual address,
1322 * 1 indicates success, -errno is returned if error is detected.
1324 static int hva_to_pfn_slow(unsigned long addr
, bool *async
, bool write_fault
,
1325 bool *writable
, pfn_t
*pfn
)
1327 struct page
*page
[1];
1333 *writable
= write_fault
;
1336 down_read(¤t
->mm
->mmap_sem
);
1337 npages
= get_user_page_nowait(current
, current
->mm
,
1338 addr
, write_fault
, page
);
1339 up_read(¤t
->mm
->mmap_sem
);
1341 npages
= __get_user_pages_unlocked(current
, current
->mm
, addr
, 1,
1342 write_fault
, 0, page
,
1343 FOLL_TOUCH
|FOLL_HWPOISON
);
1347 /* map read fault as writable if possible */
1348 if (unlikely(!write_fault
) && writable
) {
1349 struct page
*wpage
[1];
1351 npages
= __get_user_pages_fast(addr
, 1, 1, wpage
);
1360 *pfn
= page_to_pfn(page
[0]);
1364 static bool vma_is_valid(struct vm_area_struct
*vma
, bool write_fault
)
1366 if (unlikely(!(vma
->vm_flags
& VM_READ
)))
1369 if (write_fault
&& (unlikely(!(vma
->vm_flags
& VM_WRITE
))))
1376 * Pin guest page in memory and return its pfn.
1377 * @addr: host virtual address which maps memory to the guest
1378 * @atomic: whether this function can sleep
1379 * @async: whether this function need to wait IO complete if the
1380 * host page is not in the memory
1381 * @write_fault: whether we should get a writable host page
1382 * @writable: whether it allows to map a writable host page for !@write_fault
1384 * The function will map a writable host page for these two cases:
1385 * 1): @write_fault = true
1386 * 2): @write_fault = false && @writable, @writable will tell the caller
1387 * whether the mapping is writable.
1389 static pfn_t
hva_to_pfn(unsigned long addr
, bool atomic
, bool *async
,
1390 bool write_fault
, bool *writable
)
1392 struct vm_area_struct
*vma
;
1396 /* we can do it either atomically or asynchronously, not both */
1397 BUG_ON(atomic
&& async
);
1399 if (hva_to_pfn_fast(addr
, atomic
, async
, write_fault
, writable
, &pfn
))
1403 return KVM_PFN_ERR_FAULT
;
1405 npages
= hva_to_pfn_slow(addr
, async
, write_fault
, writable
, &pfn
);
1409 down_read(¤t
->mm
->mmap_sem
);
1410 if (npages
== -EHWPOISON
||
1411 (!async
&& check_user_page_hwpoison(addr
))) {
1412 pfn
= KVM_PFN_ERR_HWPOISON
;
1416 vma
= find_vma_intersection(current
->mm
, addr
, addr
+ 1);
1419 pfn
= KVM_PFN_ERR_FAULT
;
1420 else if ((vma
->vm_flags
& VM_PFNMAP
)) {
1421 pfn
= ((addr
- vma
->vm_start
) >> PAGE_SHIFT
) +
1423 BUG_ON(!kvm_is_reserved_pfn(pfn
));
1425 if (async
&& vma_is_valid(vma
, write_fault
))
1427 pfn
= KVM_PFN_ERR_FAULT
;
1430 up_read(¤t
->mm
->mmap_sem
);
1434 pfn_t
__gfn_to_pfn_memslot(struct kvm_memory_slot
*slot
, gfn_t gfn
, bool atomic
,
1435 bool *async
, bool write_fault
, bool *writable
)
1437 unsigned long addr
= __gfn_to_hva_many(slot
, gfn
, NULL
, write_fault
);
1439 if (addr
== KVM_HVA_ERR_RO_BAD
)
1440 return KVM_PFN_ERR_RO_FAULT
;
1442 if (kvm_is_error_hva(addr
))
1443 return KVM_PFN_NOSLOT
;
1445 /* Do not map writable pfn in the readonly memslot. */
1446 if (writable
&& memslot_is_readonly(slot
)) {
1451 return hva_to_pfn(addr
, atomic
, async
, write_fault
,
1454 EXPORT_SYMBOL_GPL(__gfn_to_pfn_memslot
);
1456 pfn_t
gfn_to_pfn_prot(struct kvm
*kvm
, gfn_t gfn
, bool write_fault
,
1459 return __gfn_to_pfn_memslot(gfn_to_memslot(kvm
, gfn
), gfn
, false, NULL
,
1460 write_fault
, writable
);
1462 EXPORT_SYMBOL_GPL(gfn_to_pfn_prot
);
1464 pfn_t
gfn_to_pfn_memslot(struct kvm_memory_slot
*slot
, gfn_t gfn
)
1466 return __gfn_to_pfn_memslot(slot
, gfn
, false, NULL
, true, NULL
);
1468 EXPORT_SYMBOL_GPL(gfn_to_pfn_memslot
);
1470 pfn_t
gfn_to_pfn_memslot_atomic(struct kvm_memory_slot
*slot
, gfn_t gfn
)
1472 return __gfn_to_pfn_memslot(slot
, gfn
, true, NULL
, true, NULL
);
1474 EXPORT_SYMBOL_GPL(gfn_to_pfn_memslot_atomic
);
1476 pfn_t
gfn_to_pfn_atomic(struct kvm
*kvm
, gfn_t gfn
)
1478 return gfn_to_pfn_memslot_atomic(gfn_to_memslot(kvm
, gfn
), gfn
);
1480 EXPORT_SYMBOL_GPL(gfn_to_pfn_atomic
);
1482 pfn_t
kvm_vcpu_gfn_to_pfn_atomic(struct kvm_vcpu
*vcpu
, gfn_t gfn
)
1484 return gfn_to_pfn_memslot_atomic(kvm_vcpu_gfn_to_memslot(vcpu
, gfn
), gfn
);
1486 EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_pfn_atomic
);
1488 pfn_t
gfn_to_pfn(struct kvm
*kvm
, gfn_t gfn
)
1490 return gfn_to_pfn_memslot(gfn_to_memslot(kvm
, gfn
), gfn
);
1492 EXPORT_SYMBOL_GPL(gfn_to_pfn
);
1494 pfn_t
kvm_vcpu_gfn_to_pfn(struct kvm_vcpu
*vcpu
, gfn_t gfn
)
1496 return gfn_to_pfn_memslot(kvm_vcpu_gfn_to_memslot(vcpu
, gfn
), gfn
);
1498 EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_pfn
);
1500 int gfn_to_page_many_atomic(struct kvm_memory_slot
*slot
, gfn_t gfn
,
1501 struct page
**pages
, int nr_pages
)
1506 addr
= gfn_to_hva_many(slot
, gfn
, &entry
);
1507 if (kvm_is_error_hva(addr
))
1510 if (entry
< nr_pages
)
1513 return __get_user_pages_fast(addr
, nr_pages
, 1, pages
);
1515 EXPORT_SYMBOL_GPL(gfn_to_page_many_atomic
);
1517 static struct page
*kvm_pfn_to_page(pfn_t pfn
)
1519 if (is_error_noslot_pfn(pfn
))
1520 return KVM_ERR_PTR_BAD_PAGE
;
1522 if (kvm_is_reserved_pfn(pfn
)) {
1524 return KVM_ERR_PTR_BAD_PAGE
;
1527 return pfn_to_page(pfn
);
1530 struct page
*gfn_to_page(struct kvm
*kvm
, gfn_t gfn
)
1534 pfn
= gfn_to_pfn(kvm
, gfn
);
1536 return kvm_pfn_to_page(pfn
);
1538 EXPORT_SYMBOL_GPL(gfn_to_page
);
1540 struct page
*kvm_vcpu_gfn_to_page(struct kvm_vcpu
*vcpu
, gfn_t gfn
)
1544 pfn
= kvm_vcpu_gfn_to_pfn(vcpu
, gfn
);
1546 return kvm_pfn_to_page(pfn
);
1548 EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_page
);
1550 void kvm_release_page_clean(struct page
*page
)
1552 WARN_ON(is_error_page(page
));
1554 kvm_release_pfn_clean(page_to_pfn(page
));
1556 EXPORT_SYMBOL_GPL(kvm_release_page_clean
);
1558 void kvm_release_pfn_clean(pfn_t pfn
)
1560 if (!is_error_noslot_pfn(pfn
) && !kvm_is_reserved_pfn(pfn
))
1561 put_page(pfn_to_page(pfn
));
1563 EXPORT_SYMBOL_GPL(kvm_release_pfn_clean
);
1565 void kvm_release_page_dirty(struct page
*page
)
1567 WARN_ON(is_error_page(page
));
1569 kvm_release_pfn_dirty(page_to_pfn(page
));
1571 EXPORT_SYMBOL_GPL(kvm_release_page_dirty
);
1573 static void kvm_release_pfn_dirty(pfn_t pfn
)
1575 kvm_set_pfn_dirty(pfn
);
1576 kvm_release_pfn_clean(pfn
);
1579 void kvm_set_pfn_dirty(pfn_t pfn
)
1581 if (!kvm_is_reserved_pfn(pfn
)) {
1582 struct page
*page
= pfn_to_page(pfn
);
1584 if (!PageReserved(page
))
1588 EXPORT_SYMBOL_GPL(kvm_set_pfn_dirty
);
1590 void kvm_set_pfn_accessed(pfn_t pfn
)
1592 if (!kvm_is_reserved_pfn(pfn
))
1593 mark_page_accessed(pfn_to_page(pfn
));
1595 EXPORT_SYMBOL_GPL(kvm_set_pfn_accessed
);
1597 void kvm_get_pfn(pfn_t pfn
)
1599 if (!kvm_is_reserved_pfn(pfn
))
1600 get_page(pfn_to_page(pfn
));
1602 EXPORT_SYMBOL_GPL(kvm_get_pfn
);
1604 static int next_segment(unsigned long len
, int offset
)
1606 if (len
> PAGE_SIZE
- offset
)
1607 return PAGE_SIZE
- offset
;
1612 static int __kvm_read_guest_page(struct kvm_memory_slot
*slot
, gfn_t gfn
,
1613 void *data
, int offset
, int len
)
1618 addr
= gfn_to_hva_memslot_prot(slot
, gfn
, NULL
);
1619 if (kvm_is_error_hva(addr
))
1621 r
= __copy_from_user(data
, (void __user
*)addr
+ offset
, len
);
1627 int kvm_read_guest_page(struct kvm
*kvm
, gfn_t gfn
, void *data
, int offset
,
1630 struct kvm_memory_slot
*slot
= gfn_to_memslot(kvm
, gfn
);
1632 return __kvm_read_guest_page(slot
, gfn
, data
, offset
, len
);
1634 EXPORT_SYMBOL_GPL(kvm_read_guest_page
);
1636 int kvm_vcpu_read_guest_page(struct kvm_vcpu
*vcpu
, gfn_t gfn
, void *data
,
1637 int offset
, int len
)
1639 struct kvm_memory_slot
*slot
= kvm_vcpu_gfn_to_memslot(vcpu
, gfn
);
1641 return __kvm_read_guest_page(slot
, gfn
, data
, offset
, len
);
1643 EXPORT_SYMBOL_GPL(kvm_vcpu_read_guest_page
);
1645 int kvm_read_guest(struct kvm
*kvm
, gpa_t gpa
, void *data
, unsigned long len
)
1647 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1649 int offset
= offset_in_page(gpa
);
1652 while ((seg
= next_segment(len
, offset
)) != 0) {
1653 ret
= kvm_read_guest_page(kvm
, gfn
, data
, offset
, seg
);
1663 EXPORT_SYMBOL_GPL(kvm_read_guest
);
1665 int kvm_vcpu_read_guest(struct kvm_vcpu
*vcpu
, gpa_t gpa
, void *data
, unsigned long len
)
1667 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1669 int offset
= offset_in_page(gpa
);
1672 while ((seg
= next_segment(len
, offset
)) != 0) {
1673 ret
= kvm_vcpu_read_guest_page(vcpu
, gfn
, data
, offset
, seg
);
1683 EXPORT_SYMBOL_GPL(kvm_vcpu_read_guest
);
1685 static int __kvm_read_guest_atomic(struct kvm_memory_slot
*slot
, gfn_t gfn
,
1686 void *data
, int offset
, unsigned long len
)
1691 addr
= gfn_to_hva_memslot_prot(slot
, gfn
, NULL
);
1692 if (kvm_is_error_hva(addr
))
1694 pagefault_disable();
1695 r
= __copy_from_user_inatomic(data
, (void __user
*)addr
+ offset
, len
);
1702 int kvm_read_guest_atomic(struct kvm
*kvm
, gpa_t gpa
, void *data
,
1705 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1706 struct kvm_memory_slot
*slot
= gfn_to_memslot(kvm
, gfn
);
1707 int offset
= offset_in_page(gpa
);
1709 return __kvm_read_guest_atomic(slot
, gfn
, data
, offset
, len
);
1711 EXPORT_SYMBOL_GPL(kvm_read_guest_atomic
);
1713 int kvm_vcpu_read_guest_atomic(struct kvm_vcpu
*vcpu
, gpa_t gpa
,
1714 void *data
, unsigned long len
)
1716 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1717 struct kvm_memory_slot
*slot
= kvm_vcpu_gfn_to_memslot(vcpu
, gfn
);
1718 int offset
= offset_in_page(gpa
);
1720 return __kvm_read_guest_atomic(slot
, gfn
, data
, offset
, len
);
1722 EXPORT_SYMBOL_GPL(kvm_vcpu_read_guest_atomic
);
1724 static int __kvm_write_guest_page(struct kvm_memory_slot
*memslot
, gfn_t gfn
,
1725 const void *data
, int offset
, int len
)
1730 addr
= gfn_to_hva_memslot(memslot
, gfn
);
1731 if (kvm_is_error_hva(addr
))
1733 r
= __copy_to_user((void __user
*)addr
+ offset
, data
, len
);
1736 mark_page_dirty_in_slot(memslot
, gfn
);
1740 int kvm_write_guest_page(struct kvm
*kvm
, gfn_t gfn
,
1741 const void *data
, int offset
, int len
)
1743 struct kvm_memory_slot
*slot
= gfn_to_memslot(kvm
, gfn
);
1745 return __kvm_write_guest_page(slot
, gfn
, data
, offset
, len
);
1747 EXPORT_SYMBOL_GPL(kvm_write_guest_page
);
1749 int kvm_vcpu_write_guest_page(struct kvm_vcpu
*vcpu
, gfn_t gfn
,
1750 const void *data
, int offset
, int len
)
1752 struct kvm_memory_slot
*slot
= kvm_vcpu_gfn_to_memslot(vcpu
, gfn
);
1754 return __kvm_write_guest_page(slot
, gfn
, data
, offset
, len
);
1756 EXPORT_SYMBOL_GPL(kvm_vcpu_write_guest_page
);
1758 int kvm_write_guest(struct kvm
*kvm
, gpa_t gpa
, const void *data
,
1761 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1763 int offset
= offset_in_page(gpa
);
1766 while ((seg
= next_segment(len
, offset
)) != 0) {
1767 ret
= kvm_write_guest_page(kvm
, gfn
, data
, offset
, seg
);
1777 EXPORT_SYMBOL_GPL(kvm_write_guest
);
1779 int kvm_vcpu_write_guest(struct kvm_vcpu
*vcpu
, gpa_t gpa
, const void *data
,
1782 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1784 int offset
= offset_in_page(gpa
);
1787 while ((seg
= next_segment(len
, offset
)) != 0) {
1788 ret
= kvm_vcpu_write_guest_page(vcpu
, gfn
, data
, offset
, seg
);
1798 EXPORT_SYMBOL_GPL(kvm_vcpu_write_guest
);
1800 int kvm_gfn_to_hva_cache_init(struct kvm
*kvm
, struct gfn_to_hva_cache
*ghc
,
1801 gpa_t gpa
, unsigned long len
)
1803 struct kvm_memslots
*slots
= kvm_memslots(kvm
);
1804 int offset
= offset_in_page(gpa
);
1805 gfn_t start_gfn
= gpa
>> PAGE_SHIFT
;
1806 gfn_t end_gfn
= (gpa
+ len
- 1) >> PAGE_SHIFT
;
1807 gfn_t nr_pages_needed
= end_gfn
- start_gfn
+ 1;
1808 gfn_t nr_pages_avail
;
1811 ghc
->generation
= slots
->generation
;
1813 ghc
->memslot
= gfn_to_memslot(kvm
, start_gfn
);
1814 ghc
->hva
= gfn_to_hva_many(ghc
->memslot
, start_gfn
, NULL
);
1815 if (!kvm_is_error_hva(ghc
->hva
) && nr_pages_needed
<= 1) {
1819 * If the requested region crosses two memslots, we still
1820 * verify that the entire region is valid here.
1822 while (start_gfn
<= end_gfn
) {
1823 ghc
->memslot
= gfn_to_memslot(kvm
, start_gfn
);
1824 ghc
->hva
= gfn_to_hva_many(ghc
->memslot
, start_gfn
,
1826 if (kvm_is_error_hva(ghc
->hva
))
1828 start_gfn
+= nr_pages_avail
;
1830 /* Use the slow path for cross page reads and writes. */
1831 ghc
->memslot
= NULL
;
1835 EXPORT_SYMBOL_GPL(kvm_gfn_to_hva_cache_init
);
1837 int kvm_write_guest_cached(struct kvm
*kvm
, struct gfn_to_hva_cache
*ghc
,
1838 void *data
, unsigned long len
)
1840 struct kvm_memslots
*slots
= kvm_memslots(kvm
);
1843 BUG_ON(len
> ghc
->len
);
1845 if (slots
->generation
!= ghc
->generation
)
1846 kvm_gfn_to_hva_cache_init(kvm
, ghc
, ghc
->gpa
, ghc
->len
);
1848 if (unlikely(!ghc
->memslot
))
1849 return kvm_write_guest(kvm
, ghc
->gpa
, data
, len
);
1851 if (kvm_is_error_hva(ghc
->hva
))
1854 r
= __copy_to_user((void __user
*)ghc
->hva
, data
, len
);
1857 mark_page_dirty_in_slot(ghc
->memslot
, ghc
->gpa
>> PAGE_SHIFT
);
1861 EXPORT_SYMBOL_GPL(kvm_write_guest_cached
);
1863 int kvm_read_guest_cached(struct kvm
*kvm
, struct gfn_to_hva_cache
*ghc
,
1864 void *data
, unsigned long len
)
1866 struct kvm_memslots
*slots
= kvm_memslots(kvm
);
1869 BUG_ON(len
> ghc
->len
);
1871 if (slots
->generation
!= ghc
->generation
)
1872 kvm_gfn_to_hva_cache_init(kvm
, ghc
, ghc
->gpa
, ghc
->len
);
1874 if (unlikely(!ghc
->memslot
))
1875 return kvm_read_guest(kvm
, ghc
->gpa
, data
, len
);
1877 if (kvm_is_error_hva(ghc
->hva
))
1880 r
= __copy_from_user(data
, (void __user
*)ghc
->hva
, len
);
1886 EXPORT_SYMBOL_GPL(kvm_read_guest_cached
);
1888 int kvm_clear_guest_page(struct kvm
*kvm
, gfn_t gfn
, int offset
, int len
)
1890 const void *zero_page
= (const void *) __va(page_to_phys(ZERO_PAGE(0)));
1892 return kvm_write_guest_page(kvm
, gfn
, zero_page
, offset
, len
);
1894 EXPORT_SYMBOL_GPL(kvm_clear_guest_page
);
1896 int kvm_clear_guest(struct kvm
*kvm
, gpa_t gpa
, unsigned long len
)
1898 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1900 int offset
= offset_in_page(gpa
);
1903 while ((seg
= next_segment(len
, offset
)) != 0) {
1904 ret
= kvm_clear_guest_page(kvm
, gfn
, offset
, seg
);
1913 EXPORT_SYMBOL_GPL(kvm_clear_guest
);
1915 static void mark_page_dirty_in_slot(struct kvm_memory_slot
*memslot
,
1918 if (memslot
&& memslot
->dirty_bitmap
) {
1919 unsigned long rel_gfn
= gfn
- memslot
->base_gfn
;
1921 set_bit_le(rel_gfn
, memslot
->dirty_bitmap
);
1925 void mark_page_dirty(struct kvm
*kvm
, gfn_t gfn
)
1927 struct kvm_memory_slot
*memslot
;
1929 memslot
= gfn_to_memslot(kvm
, gfn
);
1930 mark_page_dirty_in_slot(memslot
, gfn
);
1932 EXPORT_SYMBOL_GPL(mark_page_dirty
);
1934 void kvm_vcpu_mark_page_dirty(struct kvm_vcpu
*vcpu
, gfn_t gfn
)
1936 struct kvm_memory_slot
*memslot
;
1938 memslot
= kvm_vcpu_gfn_to_memslot(vcpu
, gfn
);
1939 mark_page_dirty_in_slot(memslot
, gfn
);
1941 EXPORT_SYMBOL_GPL(kvm_vcpu_mark_page_dirty
);
1943 static void grow_halt_poll_ns(struct kvm_vcpu
*vcpu
)
1947 old
= val
= vcpu
->halt_poll_ns
;
1949 if (val
== 0 && halt_poll_ns_grow
)
1952 val
*= halt_poll_ns_grow
;
1954 vcpu
->halt_poll_ns
= val
;
1955 trace_kvm_halt_poll_ns_grow(vcpu
->vcpu_id
, val
, old
);
1958 static void shrink_halt_poll_ns(struct kvm_vcpu
*vcpu
)
1962 old
= val
= vcpu
->halt_poll_ns
;
1963 if (halt_poll_ns_shrink
== 0)
1966 val
/= halt_poll_ns_shrink
;
1968 vcpu
->halt_poll_ns
= val
;
1969 trace_kvm_halt_poll_ns_shrink(vcpu
->vcpu_id
, val
, old
);
1972 static int kvm_vcpu_check_block(struct kvm_vcpu
*vcpu
)
1974 if (kvm_arch_vcpu_runnable(vcpu
)) {
1975 kvm_make_request(KVM_REQ_UNHALT
, vcpu
);
1978 if (kvm_cpu_has_pending_timer(vcpu
))
1980 if (signal_pending(current
))
1987 * The vCPU has executed a HLT instruction with in-kernel mode enabled.
1989 void kvm_vcpu_block(struct kvm_vcpu
*vcpu
)
1993 bool waited
= false;
1996 start
= cur
= ktime_get();
1997 if (vcpu
->halt_poll_ns
) {
1998 ktime_t stop
= ktime_add_ns(ktime_get(), vcpu
->halt_poll_ns
);
2000 ++vcpu
->stat
.halt_attempted_poll
;
2003 * This sets KVM_REQ_UNHALT if an interrupt
2006 if (kvm_vcpu_check_block(vcpu
) < 0) {
2007 ++vcpu
->stat
.halt_successful_poll
;
2011 } while (single_task_running() && ktime_before(cur
, stop
));
2014 kvm_arch_vcpu_blocking(vcpu
);
2017 prepare_to_wait(&vcpu
->wq
, &wait
, TASK_INTERRUPTIBLE
);
2019 if (kvm_vcpu_check_block(vcpu
) < 0)
2026 finish_wait(&vcpu
->wq
, &wait
);
2029 kvm_arch_vcpu_unblocking(vcpu
);
2031 block_ns
= ktime_to_ns(cur
) - ktime_to_ns(start
);
2034 if (block_ns
<= vcpu
->halt_poll_ns
)
2036 /* we had a long block, shrink polling */
2037 else if (vcpu
->halt_poll_ns
&& block_ns
> halt_poll_ns
)
2038 shrink_halt_poll_ns(vcpu
);
2039 /* we had a short halt and our poll time is too small */
2040 else if (vcpu
->halt_poll_ns
< halt_poll_ns
&&
2041 block_ns
< halt_poll_ns
)
2042 grow_halt_poll_ns(vcpu
);
2044 vcpu
->halt_poll_ns
= 0;
2046 trace_kvm_vcpu_wakeup(block_ns
, waited
);
2048 EXPORT_SYMBOL_GPL(kvm_vcpu_block
);
2052 * Kick a sleeping VCPU, or a guest VCPU in guest mode, into host kernel mode.
2054 void kvm_vcpu_kick(struct kvm_vcpu
*vcpu
)
2057 int cpu
= vcpu
->cpu
;
2058 wait_queue_head_t
*wqp
;
2060 wqp
= kvm_arch_vcpu_wq(vcpu
);
2061 if (waitqueue_active(wqp
)) {
2062 wake_up_interruptible(wqp
);
2063 ++vcpu
->stat
.halt_wakeup
;
2067 if (cpu
!= me
&& (unsigned)cpu
< nr_cpu_ids
&& cpu_online(cpu
))
2068 if (kvm_arch_vcpu_should_kick(vcpu
))
2069 smp_send_reschedule(cpu
);
2072 EXPORT_SYMBOL_GPL(kvm_vcpu_kick
);
2073 #endif /* !CONFIG_S390 */
2075 int kvm_vcpu_yield_to(struct kvm_vcpu
*target
)
2078 struct task_struct
*task
= NULL
;
2082 pid
= rcu_dereference(target
->pid
);
2084 task
= get_pid_task(pid
, PIDTYPE_PID
);
2088 ret
= yield_to(task
, 1);
2089 put_task_struct(task
);
2093 EXPORT_SYMBOL_GPL(kvm_vcpu_yield_to
);
2096 * Helper that checks whether a VCPU is eligible for directed yield.
2097 * Most eligible candidate to yield is decided by following heuristics:
2099 * (a) VCPU which has not done pl-exit or cpu relax intercepted recently
2100 * (preempted lock holder), indicated by @in_spin_loop.
2101 * Set at the beiginning and cleared at the end of interception/PLE handler.
2103 * (b) VCPU which has done pl-exit/ cpu relax intercepted but did not get
2104 * chance last time (mostly it has become eligible now since we have probably
2105 * yielded to lockholder in last iteration. This is done by toggling
2106 * @dy_eligible each time a VCPU checked for eligibility.)
2108 * Yielding to a recently pl-exited/cpu relax intercepted VCPU before yielding
2109 * to preempted lock-holder could result in wrong VCPU selection and CPU
2110 * burning. Giving priority for a potential lock-holder increases lock
2113 * Since algorithm is based on heuristics, accessing another VCPU data without
2114 * locking does not harm. It may result in trying to yield to same VCPU, fail
2115 * and continue with next VCPU and so on.
2117 static bool kvm_vcpu_eligible_for_directed_yield(struct kvm_vcpu
*vcpu
)
2119 #ifdef CONFIG_HAVE_KVM_CPU_RELAX_INTERCEPT
2122 eligible
= !vcpu
->spin_loop
.in_spin_loop
||
2123 vcpu
->spin_loop
.dy_eligible
;
2125 if (vcpu
->spin_loop
.in_spin_loop
)
2126 kvm_vcpu_set_dy_eligible(vcpu
, !vcpu
->spin_loop
.dy_eligible
);
2134 void kvm_vcpu_on_spin(struct kvm_vcpu
*me
)
2136 struct kvm
*kvm
= me
->kvm
;
2137 struct kvm_vcpu
*vcpu
;
2138 int last_boosted_vcpu
= me
->kvm
->last_boosted_vcpu
;
2144 kvm_vcpu_set_in_spin_loop(me
, true);
2146 * We boost the priority of a VCPU that is runnable but not
2147 * currently running, because it got preempted by something
2148 * else and called schedule in __vcpu_run. Hopefully that
2149 * VCPU is holding the lock that we need and will release it.
2150 * We approximate round-robin by starting at the last boosted VCPU.
2152 for (pass
= 0; pass
< 2 && !yielded
&& try; pass
++) {
2153 kvm_for_each_vcpu(i
, vcpu
, kvm
) {
2154 if (!pass
&& i
<= last_boosted_vcpu
) {
2155 i
= last_boosted_vcpu
;
2157 } else if (pass
&& i
> last_boosted_vcpu
)
2159 if (!ACCESS_ONCE(vcpu
->preempted
))
2163 if (waitqueue_active(&vcpu
->wq
) && !kvm_arch_vcpu_runnable(vcpu
))
2165 if (!kvm_vcpu_eligible_for_directed_yield(vcpu
))
2168 yielded
= kvm_vcpu_yield_to(vcpu
);
2170 kvm
->last_boosted_vcpu
= i
;
2172 } else if (yielded
< 0) {
2179 kvm_vcpu_set_in_spin_loop(me
, false);
2181 /* Ensure vcpu is not eligible during next spinloop */
2182 kvm_vcpu_set_dy_eligible(me
, false);
2184 EXPORT_SYMBOL_GPL(kvm_vcpu_on_spin
);
2186 static int kvm_vcpu_fault(struct vm_area_struct
*vma
, struct vm_fault
*vmf
)
2188 struct kvm_vcpu
*vcpu
= vma
->vm_file
->private_data
;
2191 if (vmf
->pgoff
== 0)
2192 page
= virt_to_page(vcpu
->run
);
2194 else if (vmf
->pgoff
== KVM_PIO_PAGE_OFFSET
)
2195 page
= virt_to_page(vcpu
->arch
.pio_data
);
2197 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2198 else if (vmf
->pgoff
== KVM_COALESCED_MMIO_PAGE_OFFSET
)
2199 page
= virt_to_page(vcpu
->kvm
->coalesced_mmio_ring
);
2202 return kvm_arch_vcpu_fault(vcpu
, vmf
);
2208 static const struct vm_operations_struct kvm_vcpu_vm_ops
= {
2209 .fault
= kvm_vcpu_fault
,
2212 static int kvm_vcpu_mmap(struct file
*file
, struct vm_area_struct
*vma
)
2214 vma
->vm_ops
= &kvm_vcpu_vm_ops
;
2218 static int kvm_vcpu_release(struct inode
*inode
, struct file
*filp
)
2220 struct kvm_vcpu
*vcpu
= filp
->private_data
;
2222 kvm_put_kvm(vcpu
->kvm
);
2226 static struct file_operations kvm_vcpu_fops
= {
2227 .release
= kvm_vcpu_release
,
2228 .unlocked_ioctl
= kvm_vcpu_ioctl
,
2229 #ifdef CONFIG_KVM_COMPAT
2230 .compat_ioctl
= kvm_vcpu_compat_ioctl
,
2232 .mmap
= kvm_vcpu_mmap
,
2233 .llseek
= noop_llseek
,
2237 * Allocates an inode for the vcpu.
2239 static int create_vcpu_fd(struct kvm_vcpu
*vcpu
)
2241 return anon_inode_getfd("kvm-vcpu", &kvm_vcpu_fops
, vcpu
, O_RDWR
| O_CLOEXEC
);
2245 * Creates some virtual cpus. Good luck creating more than one.
2247 static int kvm_vm_ioctl_create_vcpu(struct kvm
*kvm
, u32 id
)
2250 struct kvm_vcpu
*vcpu
;
2252 if (id
>= KVM_MAX_VCPUS
)
2255 vcpu
= kvm_arch_vcpu_create(kvm
, id
);
2257 return PTR_ERR(vcpu
);
2259 preempt_notifier_init(&vcpu
->preempt_notifier
, &kvm_preempt_ops
);
2261 r
= kvm_arch_vcpu_setup(vcpu
);
2265 mutex_lock(&kvm
->lock
);
2266 if (!kvm_vcpu_compatible(vcpu
)) {
2268 goto unlock_vcpu_destroy
;
2270 if (atomic_read(&kvm
->online_vcpus
) == KVM_MAX_VCPUS
) {
2272 goto unlock_vcpu_destroy
;
2274 if (kvm_get_vcpu_by_id(kvm
, id
)) {
2276 goto unlock_vcpu_destroy
;
2279 BUG_ON(kvm
->vcpus
[atomic_read(&kvm
->online_vcpus
)]);
2281 /* Now it's all set up, let userspace reach it */
2283 r
= create_vcpu_fd(vcpu
);
2286 goto unlock_vcpu_destroy
;
2289 kvm
->vcpus
[atomic_read(&kvm
->online_vcpus
)] = vcpu
;
2292 * Pairs with smp_rmb() in kvm_get_vcpu. Write kvm->vcpus
2293 * before kvm->online_vcpu's incremented value.
2296 atomic_inc(&kvm
->online_vcpus
);
2298 mutex_unlock(&kvm
->lock
);
2299 kvm_arch_vcpu_postcreate(vcpu
);
2302 unlock_vcpu_destroy
:
2303 mutex_unlock(&kvm
->lock
);
2305 kvm_arch_vcpu_destroy(vcpu
);
2309 static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu
*vcpu
, sigset_t
*sigset
)
2312 sigdelsetmask(sigset
, sigmask(SIGKILL
)|sigmask(SIGSTOP
));
2313 vcpu
->sigset_active
= 1;
2314 vcpu
->sigset
= *sigset
;
2316 vcpu
->sigset_active
= 0;
2320 static long kvm_vcpu_ioctl(struct file
*filp
,
2321 unsigned int ioctl
, unsigned long arg
)
2323 struct kvm_vcpu
*vcpu
= filp
->private_data
;
2324 void __user
*argp
= (void __user
*)arg
;
2326 struct kvm_fpu
*fpu
= NULL
;
2327 struct kvm_sregs
*kvm_sregs
= NULL
;
2329 if (vcpu
->kvm
->mm
!= current
->mm
)
2332 if (unlikely(_IOC_TYPE(ioctl
) != KVMIO
))
2335 #if defined(CONFIG_S390) || defined(CONFIG_PPC) || defined(CONFIG_MIPS)
2337 * Special cases: vcpu ioctls that are asynchronous to vcpu execution,
2338 * so vcpu_load() would break it.
2340 if (ioctl
== KVM_S390_INTERRUPT
|| ioctl
== KVM_S390_IRQ
|| ioctl
== KVM_INTERRUPT
)
2341 return kvm_arch_vcpu_ioctl(filp
, ioctl
, arg
);
2345 r
= vcpu_load(vcpu
);
2353 if (unlikely(vcpu
->pid
!= current
->pids
[PIDTYPE_PID
].pid
)) {
2354 /* The thread running this VCPU changed. */
2355 struct pid
*oldpid
= vcpu
->pid
;
2356 struct pid
*newpid
= get_task_pid(current
, PIDTYPE_PID
);
2358 rcu_assign_pointer(vcpu
->pid
, newpid
);
2363 r
= kvm_arch_vcpu_ioctl_run(vcpu
, vcpu
->run
);
2364 trace_kvm_userspace_exit(vcpu
->run
->exit_reason
, r
);
2366 case KVM_GET_REGS
: {
2367 struct kvm_regs
*kvm_regs
;
2370 kvm_regs
= kzalloc(sizeof(struct kvm_regs
), GFP_KERNEL
);
2373 r
= kvm_arch_vcpu_ioctl_get_regs(vcpu
, kvm_regs
);
2377 if (copy_to_user(argp
, kvm_regs
, sizeof(struct kvm_regs
)))
2384 case KVM_SET_REGS
: {
2385 struct kvm_regs
*kvm_regs
;
2388 kvm_regs
= memdup_user(argp
, sizeof(*kvm_regs
));
2389 if (IS_ERR(kvm_regs
)) {
2390 r
= PTR_ERR(kvm_regs
);
2393 r
= kvm_arch_vcpu_ioctl_set_regs(vcpu
, kvm_regs
);
2397 case KVM_GET_SREGS
: {
2398 kvm_sregs
= kzalloc(sizeof(struct kvm_sregs
), GFP_KERNEL
);
2402 r
= kvm_arch_vcpu_ioctl_get_sregs(vcpu
, kvm_sregs
);
2406 if (copy_to_user(argp
, kvm_sregs
, sizeof(struct kvm_sregs
)))
2411 case KVM_SET_SREGS
: {
2412 kvm_sregs
= memdup_user(argp
, sizeof(*kvm_sregs
));
2413 if (IS_ERR(kvm_sregs
)) {
2414 r
= PTR_ERR(kvm_sregs
);
2418 r
= kvm_arch_vcpu_ioctl_set_sregs(vcpu
, kvm_sregs
);
2421 case KVM_GET_MP_STATE
: {
2422 struct kvm_mp_state mp_state
;
2424 r
= kvm_arch_vcpu_ioctl_get_mpstate(vcpu
, &mp_state
);
2428 if (copy_to_user(argp
, &mp_state
, sizeof(mp_state
)))
2433 case KVM_SET_MP_STATE
: {
2434 struct kvm_mp_state mp_state
;
2437 if (copy_from_user(&mp_state
, argp
, sizeof(mp_state
)))
2439 r
= kvm_arch_vcpu_ioctl_set_mpstate(vcpu
, &mp_state
);
2442 case KVM_TRANSLATE
: {
2443 struct kvm_translation tr
;
2446 if (copy_from_user(&tr
, argp
, sizeof(tr
)))
2448 r
= kvm_arch_vcpu_ioctl_translate(vcpu
, &tr
);
2452 if (copy_to_user(argp
, &tr
, sizeof(tr
)))
2457 case KVM_SET_GUEST_DEBUG
: {
2458 struct kvm_guest_debug dbg
;
2461 if (copy_from_user(&dbg
, argp
, sizeof(dbg
)))
2463 r
= kvm_arch_vcpu_ioctl_set_guest_debug(vcpu
, &dbg
);
2466 case KVM_SET_SIGNAL_MASK
: {
2467 struct kvm_signal_mask __user
*sigmask_arg
= argp
;
2468 struct kvm_signal_mask kvm_sigmask
;
2469 sigset_t sigset
, *p
;
2474 if (copy_from_user(&kvm_sigmask
, argp
,
2475 sizeof(kvm_sigmask
)))
2478 if (kvm_sigmask
.len
!= sizeof(sigset
))
2481 if (copy_from_user(&sigset
, sigmask_arg
->sigset
,
2486 r
= kvm_vcpu_ioctl_set_sigmask(vcpu
, p
);
2490 fpu
= kzalloc(sizeof(struct kvm_fpu
), GFP_KERNEL
);
2494 r
= kvm_arch_vcpu_ioctl_get_fpu(vcpu
, fpu
);
2498 if (copy_to_user(argp
, fpu
, sizeof(struct kvm_fpu
)))
2504 fpu
= memdup_user(argp
, sizeof(*fpu
));
2510 r
= kvm_arch_vcpu_ioctl_set_fpu(vcpu
, fpu
);
2514 r
= kvm_arch_vcpu_ioctl(filp
, ioctl
, arg
);
2523 #ifdef CONFIG_KVM_COMPAT
2524 static long kvm_vcpu_compat_ioctl(struct file
*filp
,
2525 unsigned int ioctl
, unsigned long arg
)
2527 struct kvm_vcpu
*vcpu
= filp
->private_data
;
2528 void __user
*argp
= compat_ptr(arg
);
2531 if (vcpu
->kvm
->mm
!= current
->mm
)
2535 case KVM_SET_SIGNAL_MASK
: {
2536 struct kvm_signal_mask __user
*sigmask_arg
= argp
;
2537 struct kvm_signal_mask kvm_sigmask
;
2538 compat_sigset_t csigset
;
2543 if (copy_from_user(&kvm_sigmask
, argp
,
2544 sizeof(kvm_sigmask
)))
2547 if (kvm_sigmask
.len
!= sizeof(csigset
))
2550 if (copy_from_user(&csigset
, sigmask_arg
->sigset
,
2553 sigset_from_compat(&sigset
, &csigset
);
2554 r
= kvm_vcpu_ioctl_set_sigmask(vcpu
, &sigset
);
2556 r
= kvm_vcpu_ioctl_set_sigmask(vcpu
, NULL
);
2560 r
= kvm_vcpu_ioctl(filp
, ioctl
, arg
);
2568 static int kvm_device_ioctl_attr(struct kvm_device
*dev
,
2569 int (*accessor
)(struct kvm_device
*dev
,
2570 struct kvm_device_attr
*attr
),
2573 struct kvm_device_attr attr
;
2578 if (copy_from_user(&attr
, (void __user
*)arg
, sizeof(attr
)))
2581 return accessor(dev
, &attr
);
2584 static long kvm_device_ioctl(struct file
*filp
, unsigned int ioctl
,
2587 struct kvm_device
*dev
= filp
->private_data
;
2590 case KVM_SET_DEVICE_ATTR
:
2591 return kvm_device_ioctl_attr(dev
, dev
->ops
->set_attr
, arg
);
2592 case KVM_GET_DEVICE_ATTR
:
2593 return kvm_device_ioctl_attr(dev
, dev
->ops
->get_attr
, arg
);
2594 case KVM_HAS_DEVICE_ATTR
:
2595 return kvm_device_ioctl_attr(dev
, dev
->ops
->has_attr
, arg
);
2597 if (dev
->ops
->ioctl
)
2598 return dev
->ops
->ioctl(dev
, ioctl
, arg
);
2604 static int kvm_device_release(struct inode
*inode
, struct file
*filp
)
2606 struct kvm_device
*dev
= filp
->private_data
;
2607 struct kvm
*kvm
= dev
->kvm
;
2613 static const struct file_operations kvm_device_fops
= {
2614 .unlocked_ioctl
= kvm_device_ioctl
,
2615 #ifdef CONFIG_KVM_COMPAT
2616 .compat_ioctl
= kvm_device_ioctl
,
2618 .release
= kvm_device_release
,
2621 struct kvm_device
*kvm_device_from_filp(struct file
*filp
)
2623 if (filp
->f_op
!= &kvm_device_fops
)
2626 return filp
->private_data
;
2629 static struct kvm_device_ops
*kvm_device_ops_table
[KVM_DEV_TYPE_MAX
] = {
2630 #ifdef CONFIG_KVM_MPIC
2631 [KVM_DEV_TYPE_FSL_MPIC_20
] = &kvm_mpic_ops
,
2632 [KVM_DEV_TYPE_FSL_MPIC_42
] = &kvm_mpic_ops
,
2635 #ifdef CONFIG_KVM_XICS
2636 [KVM_DEV_TYPE_XICS
] = &kvm_xics_ops
,
2640 int kvm_register_device_ops(struct kvm_device_ops
*ops
, u32 type
)
2642 if (type
>= ARRAY_SIZE(kvm_device_ops_table
))
2645 if (kvm_device_ops_table
[type
] != NULL
)
2648 kvm_device_ops_table
[type
] = ops
;
2652 void kvm_unregister_device_ops(u32 type
)
2654 if (kvm_device_ops_table
[type
] != NULL
)
2655 kvm_device_ops_table
[type
] = NULL
;
2658 static int kvm_ioctl_create_device(struct kvm
*kvm
,
2659 struct kvm_create_device
*cd
)
2661 struct kvm_device_ops
*ops
= NULL
;
2662 struct kvm_device
*dev
;
2663 bool test
= cd
->flags
& KVM_CREATE_DEVICE_TEST
;
2666 if (cd
->type
>= ARRAY_SIZE(kvm_device_ops_table
))
2669 ops
= kvm_device_ops_table
[cd
->type
];
2676 dev
= kzalloc(sizeof(*dev
), GFP_KERNEL
);
2683 ret
= ops
->create(dev
, cd
->type
);
2689 ret
= anon_inode_getfd(ops
->name
, &kvm_device_fops
, dev
, O_RDWR
| O_CLOEXEC
);
2695 list_add(&dev
->vm_node
, &kvm
->devices
);
2701 static long kvm_vm_ioctl_check_extension_generic(struct kvm
*kvm
, long arg
)
2704 case KVM_CAP_USER_MEMORY
:
2705 case KVM_CAP_DESTROY_MEMORY_REGION_WORKS
:
2706 case KVM_CAP_JOIN_MEMORY_REGIONS_WORKS
:
2707 case KVM_CAP_INTERNAL_ERROR_DATA
:
2708 #ifdef CONFIG_HAVE_KVM_MSI
2709 case KVM_CAP_SIGNAL_MSI
:
2711 #ifdef CONFIG_HAVE_KVM_IRQFD
2713 case KVM_CAP_IRQFD_RESAMPLE
:
2715 case KVM_CAP_IOEVENTFD_ANY_LENGTH
:
2716 case KVM_CAP_CHECK_EXTENSION_VM
:
2718 #ifdef CONFIG_HAVE_KVM_IRQ_ROUTING
2719 case KVM_CAP_IRQ_ROUTING
:
2720 return KVM_MAX_IRQ_ROUTES
;
2722 #if KVM_ADDRESS_SPACE_NUM > 1
2723 case KVM_CAP_MULTI_ADDRESS_SPACE
:
2724 return KVM_ADDRESS_SPACE_NUM
;
2729 return kvm_vm_ioctl_check_extension(kvm
, arg
);
2732 static long kvm_vm_ioctl(struct file
*filp
,
2733 unsigned int ioctl
, unsigned long arg
)
2735 struct kvm
*kvm
= filp
->private_data
;
2736 void __user
*argp
= (void __user
*)arg
;
2739 if (kvm
->mm
!= current
->mm
)
2742 case KVM_CREATE_VCPU
:
2743 r
= kvm_vm_ioctl_create_vcpu(kvm
, arg
);
2745 case KVM_SET_USER_MEMORY_REGION
: {
2746 struct kvm_userspace_memory_region kvm_userspace_mem
;
2749 if (copy_from_user(&kvm_userspace_mem
, argp
,
2750 sizeof(kvm_userspace_mem
)))
2753 r
= kvm_vm_ioctl_set_memory_region(kvm
, &kvm_userspace_mem
);
2756 case KVM_GET_DIRTY_LOG
: {
2757 struct kvm_dirty_log log
;
2760 if (copy_from_user(&log
, argp
, sizeof(log
)))
2762 r
= kvm_vm_ioctl_get_dirty_log(kvm
, &log
);
2765 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2766 case KVM_REGISTER_COALESCED_MMIO
: {
2767 struct kvm_coalesced_mmio_zone zone
;
2770 if (copy_from_user(&zone
, argp
, sizeof(zone
)))
2772 r
= kvm_vm_ioctl_register_coalesced_mmio(kvm
, &zone
);
2775 case KVM_UNREGISTER_COALESCED_MMIO
: {
2776 struct kvm_coalesced_mmio_zone zone
;
2779 if (copy_from_user(&zone
, argp
, sizeof(zone
)))
2781 r
= kvm_vm_ioctl_unregister_coalesced_mmio(kvm
, &zone
);
2786 struct kvm_irqfd data
;
2789 if (copy_from_user(&data
, argp
, sizeof(data
)))
2791 r
= kvm_irqfd(kvm
, &data
);
2794 case KVM_IOEVENTFD
: {
2795 struct kvm_ioeventfd data
;
2798 if (copy_from_user(&data
, argp
, sizeof(data
)))
2800 r
= kvm_ioeventfd(kvm
, &data
);
2803 #ifdef CONFIG_HAVE_KVM_MSI
2804 case KVM_SIGNAL_MSI
: {
2808 if (copy_from_user(&msi
, argp
, sizeof(msi
)))
2810 r
= kvm_send_userspace_msi(kvm
, &msi
);
2814 #ifdef __KVM_HAVE_IRQ_LINE
2815 case KVM_IRQ_LINE_STATUS
:
2816 case KVM_IRQ_LINE
: {
2817 struct kvm_irq_level irq_event
;
2820 if (copy_from_user(&irq_event
, argp
, sizeof(irq_event
)))
2823 r
= kvm_vm_ioctl_irq_line(kvm
, &irq_event
,
2824 ioctl
== KVM_IRQ_LINE_STATUS
);
2829 if (ioctl
== KVM_IRQ_LINE_STATUS
) {
2830 if (copy_to_user(argp
, &irq_event
, sizeof(irq_event
)))
2838 #ifdef CONFIG_HAVE_KVM_IRQ_ROUTING
2839 case KVM_SET_GSI_ROUTING
: {
2840 struct kvm_irq_routing routing
;
2841 struct kvm_irq_routing __user
*urouting
;
2842 struct kvm_irq_routing_entry
*entries
;
2845 if (copy_from_user(&routing
, argp
, sizeof(routing
)))
2848 if (routing
.nr
>= KVM_MAX_IRQ_ROUTES
)
2853 entries
= vmalloc(routing
.nr
* sizeof(*entries
));
2858 if (copy_from_user(entries
, urouting
->entries
,
2859 routing
.nr
* sizeof(*entries
)))
2860 goto out_free_irq_routing
;
2861 r
= kvm_set_irq_routing(kvm
, entries
, routing
.nr
,
2863 out_free_irq_routing
:
2867 #endif /* CONFIG_HAVE_KVM_IRQ_ROUTING */
2868 case KVM_CREATE_DEVICE
: {
2869 struct kvm_create_device cd
;
2872 if (copy_from_user(&cd
, argp
, sizeof(cd
)))
2875 r
= kvm_ioctl_create_device(kvm
, &cd
);
2880 if (copy_to_user(argp
, &cd
, sizeof(cd
)))
2886 case KVM_CHECK_EXTENSION
:
2887 r
= kvm_vm_ioctl_check_extension_generic(kvm
, arg
);
2890 r
= kvm_arch_vm_ioctl(filp
, ioctl
, arg
);
2896 #ifdef CONFIG_KVM_COMPAT
2897 struct compat_kvm_dirty_log
{
2901 compat_uptr_t dirty_bitmap
; /* one bit per page */
2906 static long kvm_vm_compat_ioctl(struct file
*filp
,
2907 unsigned int ioctl
, unsigned long arg
)
2909 struct kvm
*kvm
= filp
->private_data
;
2912 if (kvm
->mm
!= current
->mm
)
2915 case KVM_GET_DIRTY_LOG
: {
2916 struct compat_kvm_dirty_log compat_log
;
2917 struct kvm_dirty_log log
;
2920 if (copy_from_user(&compat_log
, (void __user
*)arg
,
2921 sizeof(compat_log
)))
2923 log
.slot
= compat_log
.slot
;
2924 log
.padding1
= compat_log
.padding1
;
2925 log
.padding2
= compat_log
.padding2
;
2926 log
.dirty_bitmap
= compat_ptr(compat_log
.dirty_bitmap
);
2928 r
= kvm_vm_ioctl_get_dirty_log(kvm
, &log
);
2932 r
= kvm_vm_ioctl(filp
, ioctl
, arg
);
2940 static struct file_operations kvm_vm_fops
= {
2941 .release
= kvm_vm_release
,
2942 .unlocked_ioctl
= kvm_vm_ioctl
,
2943 #ifdef CONFIG_KVM_COMPAT
2944 .compat_ioctl
= kvm_vm_compat_ioctl
,
2946 .llseek
= noop_llseek
,
2949 static int kvm_dev_ioctl_create_vm(unsigned long type
)
2954 kvm
= kvm_create_vm(type
);
2956 return PTR_ERR(kvm
);
2957 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2958 r
= kvm_coalesced_mmio_init(kvm
);
2964 r
= anon_inode_getfd("kvm-vm", &kvm_vm_fops
, kvm
, O_RDWR
| O_CLOEXEC
);
2971 static long kvm_dev_ioctl(struct file
*filp
,
2972 unsigned int ioctl
, unsigned long arg
)
2977 case KVM_GET_API_VERSION
:
2980 r
= KVM_API_VERSION
;
2983 r
= kvm_dev_ioctl_create_vm(arg
);
2985 case KVM_CHECK_EXTENSION
:
2986 r
= kvm_vm_ioctl_check_extension_generic(NULL
, arg
);
2988 case KVM_GET_VCPU_MMAP_SIZE
:
2991 r
= PAGE_SIZE
; /* struct kvm_run */
2993 r
+= PAGE_SIZE
; /* pio data page */
2995 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2996 r
+= PAGE_SIZE
; /* coalesced mmio ring page */
2999 case KVM_TRACE_ENABLE
:
3000 case KVM_TRACE_PAUSE
:
3001 case KVM_TRACE_DISABLE
:
3005 return kvm_arch_dev_ioctl(filp
, ioctl
, arg
);
3011 static struct file_operations kvm_chardev_ops
= {
3012 .unlocked_ioctl
= kvm_dev_ioctl
,
3013 .compat_ioctl
= kvm_dev_ioctl
,
3014 .llseek
= noop_llseek
,
3017 static struct miscdevice kvm_dev
= {
3023 static void hardware_enable_nolock(void *junk
)
3025 int cpu
= raw_smp_processor_id();
3028 if (cpumask_test_cpu(cpu
, cpus_hardware_enabled
))
3031 cpumask_set_cpu(cpu
, cpus_hardware_enabled
);
3033 r
= kvm_arch_hardware_enable();
3036 cpumask_clear_cpu(cpu
, cpus_hardware_enabled
);
3037 atomic_inc(&hardware_enable_failed
);
3038 pr_info("kvm: enabling virtualization on CPU%d failed\n", cpu
);
3042 static void hardware_enable(void)
3044 raw_spin_lock(&kvm_count_lock
);
3045 if (kvm_usage_count
)
3046 hardware_enable_nolock(NULL
);
3047 raw_spin_unlock(&kvm_count_lock
);
3050 static void hardware_disable_nolock(void *junk
)
3052 int cpu
= raw_smp_processor_id();
3054 if (!cpumask_test_cpu(cpu
, cpus_hardware_enabled
))
3056 cpumask_clear_cpu(cpu
, cpus_hardware_enabled
);
3057 kvm_arch_hardware_disable();
3060 static void hardware_disable(void)
3062 raw_spin_lock(&kvm_count_lock
);
3063 if (kvm_usage_count
)
3064 hardware_disable_nolock(NULL
);
3065 raw_spin_unlock(&kvm_count_lock
);
3068 static void hardware_disable_all_nolock(void)
3070 BUG_ON(!kvm_usage_count
);
3073 if (!kvm_usage_count
)
3074 on_each_cpu(hardware_disable_nolock
, NULL
, 1);
3077 static void hardware_disable_all(void)
3079 raw_spin_lock(&kvm_count_lock
);
3080 hardware_disable_all_nolock();
3081 raw_spin_unlock(&kvm_count_lock
);
3084 static int hardware_enable_all(void)
3088 raw_spin_lock(&kvm_count_lock
);
3091 if (kvm_usage_count
== 1) {
3092 atomic_set(&hardware_enable_failed
, 0);
3093 on_each_cpu(hardware_enable_nolock
, NULL
, 1);
3095 if (atomic_read(&hardware_enable_failed
)) {
3096 hardware_disable_all_nolock();
3101 raw_spin_unlock(&kvm_count_lock
);
3106 static int kvm_cpu_hotplug(struct notifier_block
*notifier
, unsigned long val
,
3109 val
&= ~CPU_TASKS_FROZEN
;
3121 static int kvm_reboot(struct notifier_block
*notifier
, unsigned long val
,
3125 * Some (well, at least mine) BIOSes hang on reboot if
3128 * And Intel TXT required VMX off for all cpu when system shutdown.
3130 pr_info("kvm: exiting hardware virtualization\n");
3131 kvm_rebooting
= true;
3132 on_each_cpu(hardware_disable_nolock
, NULL
, 1);
3136 static struct notifier_block kvm_reboot_notifier
= {
3137 .notifier_call
= kvm_reboot
,
3141 static void kvm_io_bus_destroy(struct kvm_io_bus
*bus
)
3145 for (i
= 0; i
< bus
->dev_count
; i
++) {
3146 struct kvm_io_device
*pos
= bus
->range
[i
].dev
;
3148 kvm_iodevice_destructor(pos
);
3153 static inline int kvm_io_bus_cmp(const struct kvm_io_range
*r1
,
3154 const struct kvm_io_range
*r2
)
3156 gpa_t addr1
= r1
->addr
;
3157 gpa_t addr2
= r2
->addr
;
3162 /* If r2->len == 0, match the exact address. If r2->len != 0,
3163 * accept any overlapping write. Any order is acceptable for
3164 * overlapping ranges, because kvm_io_bus_get_first_dev ensures
3165 * we process all of them.
3178 static int kvm_io_bus_sort_cmp(const void *p1
, const void *p2
)
3180 return kvm_io_bus_cmp(p1
, p2
);
3183 static int kvm_io_bus_insert_dev(struct kvm_io_bus
*bus
, struct kvm_io_device
*dev
,
3184 gpa_t addr
, int len
)
3186 bus
->range
[bus
->dev_count
++] = (struct kvm_io_range
) {
3192 sort(bus
->range
, bus
->dev_count
, sizeof(struct kvm_io_range
),
3193 kvm_io_bus_sort_cmp
, NULL
);
3198 static int kvm_io_bus_get_first_dev(struct kvm_io_bus
*bus
,
3199 gpa_t addr
, int len
)
3201 struct kvm_io_range
*range
, key
;
3204 key
= (struct kvm_io_range
) {
3209 range
= bsearch(&key
, bus
->range
, bus
->dev_count
,
3210 sizeof(struct kvm_io_range
), kvm_io_bus_sort_cmp
);
3214 off
= range
- bus
->range
;
3216 while (off
> 0 && kvm_io_bus_cmp(&key
, &bus
->range
[off
-1]) == 0)
3222 static int __kvm_io_bus_write(struct kvm_vcpu
*vcpu
, struct kvm_io_bus
*bus
,
3223 struct kvm_io_range
*range
, const void *val
)
3227 idx
= kvm_io_bus_get_first_dev(bus
, range
->addr
, range
->len
);
3231 while (idx
< bus
->dev_count
&&
3232 kvm_io_bus_cmp(range
, &bus
->range
[idx
]) == 0) {
3233 if (!kvm_iodevice_write(vcpu
, bus
->range
[idx
].dev
, range
->addr
,
3242 /* kvm_io_bus_write - called under kvm->slots_lock */
3243 int kvm_io_bus_write(struct kvm_vcpu
*vcpu
, enum kvm_bus bus_idx
, gpa_t addr
,
3244 int len
, const void *val
)
3246 struct kvm_io_bus
*bus
;
3247 struct kvm_io_range range
;
3250 range
= (struct kvm_io_range
) {
3255 bus
= srcu_dereference(vcpu
->kvm
->buses
[bus_idx
], &vcpu
->kvm
->srcu
);
3256 r
= __kvm_io_bus_write(vcpu
, bus
, &range
, val
);
3257 return r
< 0 ? r
: 0;
3260 /* kvm_io_bus_write_cookie - called under kvm->slots_lock */
3261 int kvm_io_bus_write_cookie(struct kvm_vcpu
*vcpu
, enum kvm_bus bus_idx
,
3262 gpa_t addr
, int len
, const void *val
, long cookie
)
3264 struct kvm_io_bus
*bus
;
3265 struct kvm_io_range range
;
3267 range
= (struct kvm_io_range
) {
3272 bus
= srcu_dereference(vcpu
->kvm
->buses
[bus_idx
], &vcpu
->kvm
->srcu
);
3274 /* First try the device referenced by cookie. */
3275 if ((cookie
>= 0) && (cookie
< bus
->dev_count
) &&
3276 (kvm_io_bus_cmp(&range
, &bus
->range
[cookie
]) == 0))
3277 if (!kvm_iodevice_write(vcpu
, bus
->range
[cookie
].dev
, addr
, len
,
3282 * cookie contained garbage; fall back to search and return the
3283 * correct cookie value.
3285 return __kvm_io_bus_write(vcpu
, bus
, &range
, val
);
3288 static int __kvm_io_bus_read(struct kvm_vcpu
*vcpu
, struct kvm_io_bus
*bus
,
3289 struct kvm_io_range
*range
, void *val
)
3293 idx
= kvm_io_bus_get_first_dev(bus
, range
->addr
, range
->len
);
3297 while (idx
< bus
->dev_count
&&
3298 kvm_io_bus_cmp(range
, &bus
->range
[idx
]) == 0) {
3299 if (!kvm_iodevice_read(vcpu
, bus
->range
[idx
].dev
, range
->addr
,
3307 EXPORT_SYMBOL_GPL(kvm_io_bus_write
);
3309 /* kvm_io_bus_read - called under kvm->slots_lock */
3310 int kvm_io_bus_read(struct kvm_vcpu
*vcpu
, enum kvm_bus bus_idx
, gpa_t addr
,
3313 struct kvm_io_bus
*bus
;
3314 struct kvm_io_range range
;
3317 range
= (struct kvm_io_range
) {
3322 bus
= srcu_dereference(vcpu
->kvm
->buses
[bus_idx
], &vcpu
->kvm
->srcu
);
3323 r
= __kvm_io_bus_read(vcpu
, bus
, &range
, val
);
3324 return r
< 0 ? r
: 0;
3328 /* Caller must hold slots_lock. */
3329 int kvm_io_bus_register_dev(struct kvm
*kvm
, enum kvm_bus bus_idx
, gpa_t addr
,
3330 int len
, struct kvm_io_device
*dev
)
3332 struct kvm_io_bus
*new_bus
, *bus
;
3334 bus
= kvm
->buses
[bus_idx
];
3335 /* exclude ioeventfd which is limited by maximum fd */
3336 if (bus
->dev_count
- bus
->ioeventfd_count
> NR_IOBUS_DEVS
- 1)
3339 new_bus
= kmalloc(sizeof(*bus
) + ((bus
->dev_count
+ 1) *
3340 sizeof(struct kvm_io_range
)), GFP_KERNEL
);
3343 memcpy(new_bus
, bus
, sizeof(*bus
) + (bus
->dev_count
*
3344 sizeof(struct kvm_io_range
)));
3345 kvm_io_bus_insert_dev(new_bus
, dev
, addr
, len
);
3346 rcu_assign_pointer(kvm
->buses
[bus_idx
], new_bus
);
3347 synchronize_srcu_expedited(&kvm
->srcu
);
3353 /* Caller must hold slots_lock. */
3354 int kvm_io_bus_unregister_dev(struct kvm
*kvm
, enum kvm_bus bus_idx
,
3355 struct kvm_io_device
*dev
)
3358 struct kvm_io_bus
*new_bus
, *bus
;
3360 bus
= kvm
->buses
[bus_idx
];
3362 for (i
= 0; i
< bus
->dev_count
; i
++)
3363 if (bus
->range
[i
].dev
== dev
) {
3371 new_bus
= kmalloc(sizeof(*bus
) + ((bus
->dev_count
- 1) *
3372 sizeof(struct kvm_io_range
)), GFP_KERNEL
);
3376 memcpy(new_bus
, bus
, sizeof(*bus
) + i
* sizeof(struct kvm_io_range
));
3377 new_bus
->dev_count
--;
3378 memcpy(new_bus
->range
+ i
, bus
->range
+ i
+ 1,
3379 (new_bus
->dev_count
- i
) * sizeof(struct kvm_io_range
));
3381 rcu_assign_pointer(kvm
->buses
[bus_idx
], new_bus
);
3382 synchronize_srcu_expedited(&kvm
->srcu
);
3387 static struct notifier_block kvm_cpu_notifier
= {
3388 .notifier_call
= kvm_cpu_hotplug
,
3391 static int vm_stat_get(void *_offset
, u64
*val
)
3393 unsigned offset
= (long)_offset
;
3397 spin_lock(&kvm_lock
);
3398 list_for_each_entry(kvm
, &vm_list
, vm_list
)
3399 *val
+= *(u32
*)((void *)kvm
+ offset
);
3400 spin_unlock(&kvm_lock
);
3404 DEFINE_SIMPLE_ATTRIBUTE(vm_stat_fops
, vm_stat_get
, NULL
, "%llu\n");
3406 static int vcpu_stat_get(void *_offset
, u64
*val
)
3408 unsigned offset
= (long)_offset
;
3410 struct kvm_vcpu
*vcpu
;
3414 spin_lock(&kvm_lock
);
3415 list_for_each_entry(kvm
, &vm_list
, vm_list
)
3416 kvm_for_each_vcpu(i
, vcpu
, kvm
)
3417 *val
+= *(u32
*)((void *)vcpu
+ offset
);
3419 spin_unlock(&kvm_lock
);
3423 DEFINE_SIMPLE_ATTRIBUTE(vcpu_stat_fops
, vcpu_stat_get
, NULL
, "%llu\n");
3425 static const struct file_operations
*stat_fops
[] = {
3426 [KVM_STAT_VCPU
] = &vcpu_stat_fops
,
3427 [KVM_STAT_VM
] = &vm_stat_fops
,
3430 static int kvm_init_debug(void)
3433 struct kvm_stats_debugfs_item
*p
;
3435 kvm_debugfs_dir
= debugfs_create_dir("kvm", NULL
);
3436 if (kvm_debugfs_dir
== NULL
)
3439 for (p
= debugfs_entries
; p
->name
; ++p
) {
3440 if (!debugfs_create_file(p
->name
, 0444, kvm_debugfs_dir
,
3441 (void *)(long)p
->offset
,
3442 stat_fops
[p
->kind
]))
3449 debugfs_remove_recursive(kvm_debugfs_dir
);
3454 static int kvm_suspend(void)
3456 if (kvm_usage_count
)
3457 hardware_disable_nolock(NULL
);
3461 static void kvm_resume(void)
3463 if (kvm_usage_count
) {
3464 WARN_ON(raw_spin_is_locked(&kvm_count_lock
));
3465 hardware_enable_nolock(NULL
);
3469 static struct syscore_ops kvm_syscore_ops
= {
3470 .suspend
= kvm_suspend
,
3471 .resume
= kvm_resume
,
3475 struct kvm_vcpu
*preempt_notifier_to_vcpu(struct preempt_notifier
*pn
)
3477 return container_of(pn
, struct kvm_vcpu
, preempt_notifier
);
3480 static void kvm_sched_in(struct preempt_notifier
*pn
, int cpu
)
3482 struct kvm_vcpu
*vcpu
= preempt_notifier_to_vcpu(pn
);
3484 if (vcpu
->preempted
)
3485 vcpu
->preempted
= false;
3487 kvm_arch_sched_in(vcpu
, cpu
);
3489 kvm_arch_vcpu_load(vcpu
, cpu
);
3492 static void kvm_sched_out(struct preempt_notifier
*pn
,
3493 struct task_struct
*next
)
3495 struct kvm_vcpu
*vcpu
= preempt_notifier_to_vcpu(pn
);
3497 if (current
->state
== TASK_RUNNING
)
3498 vcpu
->preempted
= true;
3499 kvm_arch_vcpu_put(vcpu
);
3502 int kvm_init(void *opaque
, unsigned vcpu_size
, unsigned vcpu_align
,
3503 struct module
*module
)
3508 r
= kvm_arch_init(opaque
);
3513 * kvm_arch_init makes sure there's at most one caller
3514 * for architectures that support multiple implementations,
3515 * like intel and amd on x86.
3516 * kvm_arch_init must be called before kvm_irqfd_init to avoid creating
3517 * conflicts in case kvm is already setup for another implementation.
3519 r
= kvm_irqfd_init();
3523 if (!zalloc_cpumask_var(&cpus_hardware_enabled
, GFP_KERNEL
)) {
3528 r
= kvm_arch_hardware_setup();
3532 for_each_online_cpu(cpu
) {
3533 smp_call_function_single(cpu
,
3534 kvm_arch_check_processor_compat
,
3540 r
= register_cpu_notifier(&kvm_cpu_notifier
);
3543 register_reboot_notifier(&kvm_reboot_notifier
);
3545 /* A kmem cache lets us meet the alignment requirements of fx_save. */
3547 vcpu_align
= __alignof__(struct kvm_vcpu
);
3548 kvm_vcpu_cache
= kmem_cache_create("kvm_vcpu", vcpu_size
, vcpu_align
,
3550 if (!kvm_vcpu_cache
) {
3555 r
= kvm_async_pf_init();
3559 kvm_chardev_ops
.owner
= module
;
3560 kvm_vm_fops
.owner
= module
;
3561 kvm_vcpu_fops
.owner
= module
;
3563 r
= misc_register(&kvm_dev
);
3565 pr_err("kvm: misc device register failed\n");
3569 register_syscore_ops(&kvm_syscore_ops
);
3571 kvm_preempt_ops
.sched_in
= kvm_sched_in
;
3572 kvm_preempt_ops
.sched_out
= kvm_sched_out
;
3574 r
= kvm_init_debug();
3576 pr_err("kvm: create debugfs files failed\n");
3580 r
= kvm_vfio_ops_init();
3586 unregister_syscore_ops(&kvm_syscore_ops
);
3587 misc_deregister(&kvm_dev
);
3589 kvm_async_pf_deinit();
3591 kmem_cache_destroy(kvm_vcpu_cache
);
3593 unregister_reboot_notifier(&kvm_reboot_notifier
);
3594 unregister_cpu_notifier(&kvm_cpu_notifier
);
3597 kvm_arch_hardware_unsetup();
3599 free_cpumask_var(cpus_hardware_enabled
);
3607 EXPORT_SYMBOL_GPL(kvm_init
);
3611 debugfs_remove_recursive(kvm_debugfs_dir
);
3612 misc_deregister(&kvm_dev
);
3613 kmem_cache_destroy(kvm_vcpu_cache
);
3614 kvm_async_pf_deinit();
3615 unregister_syscore_ops(&kvm_syscore_ops
);
3616 unregister_reboot_notifier(&kvm_reboot_notifier
);
3617 unregister_cpu_notifier(&kvm_cpu_notifier
);
3618 on_each_cpu(hardware_disable_nolock
, NULL
, 1);
3619 kvm_arch_hardware_unsetup();
3622 free_cpumask_var(cpus_hardware_enabled
);
3623 kvm_vfio_ops_exit();
3625 EXPORT_SYMBOL_GPL(kvm_exit
);