2 * Copyright (C) 2015, 2016 ARM Ltd.
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
13 * You should have received a copy of the GNU General Public License
14 * along with this program. If not, see <http://www.gnu.org/licenses/>.
17 #include <linux/kvm.h>
18 #include <linux/kvm_host.h>
19 #include <linux/list_sort.h>
20 #include <linux/interrupt.h>
21 #include <linux/irq.h>
25 #define CREATE_TRACE_POINTS
28 #ifdef CONFIG_DEBUG_SPINLOCK
29 #define DEBUG_SPINLOCK_BUG_ON(p) BUG_ON(p)
31 #define DEBUG_SPINLOCK_BUG_ON(p)
34 struct vgic_global kvm_vgic_global_state __ro_after_init
= {
35 .gicv3_cpuif
= STATIC_KEY_FALSE_INIT
,
39 * Locking order is always:
41 * its->cmd_lock (mutex)
42 * its->its_lock (mutex)
43 * vgic_cpu->ap_list_lock
47 * If you need to take multiple locks, always take the upper lock first,
48 * then the lower ones, e.g. first take the its_lock, then the irq_lock.
49 * If you are already holding a lock and need to take a higher one, you
50 * have to drop the lower ranking lock first and re-aquire it after having
51 * taken the upper one.
53 * When taking more than one ap_list_lock at the same time, always take the
54 * lowest numbered VCPU's ap_list_lock first, so:
55 * vcpuX->vcpu_id < vcpuY->vcpu_id:
56 * spin_lock(vcpuX->arch.vgic_cpu.ap_list_lock);
57 * spin_lock(vcpuY->arch.vgic_cpu.ap_list_lock);
59 * Since the VGIC must support injecting virtual interrupts from ISRs, we have
60 * to use the spin_lock_irqsave/spin_unlock_irqrestore versions of outer
61 * spinlocks for any lock that may be taken while injecting an interrupt.
65 * Iterate over the VM's list of mapped LPIs to find the one with a
66 * matching interrupt ID and return a reference to the IRQ structure.
68 static struct vgic_irq
*vgic_get_lpi(struct kvm
*kvm
, u32 intid
)
70 struct vgic_dist
*dist
= &kvm
->arch
.vgic
;
71 struct vgic_irq
*irq
= NULL
;
73 spin_lock(&dist
->lpi_list_lock
);
75 list_for_each_entry(irq
, &dist
->lpi_list_head
, lpi_list
) {
76 if (irq
->intid
!= intid
)
80 * This increases the refcount, the caller is expected to
81 * call vgic_put_irq() later once it's finished with the IRQ.
83 vgic_get_irq_kref(irq
);
89 spin_unlock(&dist
->lpi_list_lock
);
95 * This looks up the virtual interrupt ID to get the corresponding
96 * struct vgic_irq. It also increases the refcount, so any caller is expected
97 * to call vgic_put_irq() once it's finished with this IRQ.
99 struct vgic_irq
*vgic_get_irq(struct kvm
*kvm
, struct kvm_vcpu
*vcpu
,
103 if (intid
<= VGIC_MAX_PRIVATE
)
104 return &vcpu
->arch
.vgic_cpu
.private_irqs
[intid
];
107 if (intid
<= VGIC_MAX_SPI
)
108 return &kvm
->arch
.vgic
.spis
[intid
- VGIC_NR_PRIVATE_IRQS
];
111 if (intid
>= VGIC_MIN_LPI
)
112 return vgic_get_lpi(kvm
, intid
);
114 WARN(1, "Looking up struct vgic_irq for reserved INTID");
119 * We can't do anything in here, because we lack the kvm pointer to
120 * lock and remove the item from the lpi_list. So we keep this function
121 * empty and use the return value of kref_put() to trigger the freeing.
123 static void vgic_irq_release(struct kref
*ref
)
127 void vgic_put_irq(struct kvm
*kvm
, struct vgic_irq
*irq
)
129 struct vgic_dist
*dist
= &kvm
->arch
.vgic
;
131 if (irq
->intid
< VGIC_MIN_LPI
)
134 spin_lock(&dist
->lpi_list_lock
);
135 if (!kref_put(&irq
->refcount
, vgic_irq_release
)) {
136 spin_unlock(&dist
->lpi_list_lock
);
140 list_del(&irq
->lpi_list
);
141 dist
->lpi_list_count
--;
142 spin_unlock(&dist
->lpi_list_lock
);
148 * kvm_vgic_target_oracle - compute the target vcpu for an irq
150 * @irq: The irq to route. Must be already locked.
152 * Based on the current state of the interrupt (enabled, pending,
153 * active, vcpu and target_vcpu), compute the next vcpu this should be
154 * given to. Return NULL if this shouldn't be injected at all.
156 * Requires the IRQ lock to be held.
158 static struct kvm_vcpu
*vgic_target_oracle(struct vgic_irq
*irq
)
160 DEBUG_SPINLOCK_BUG_ON(!spin_is_locked(&irq
->irq_lock
));
162 /* If the interrupt is active, it must stay on the current vcpu */
164 return irq
->vcpu
? : irq
->target_vcpu
;
167 * If the IRQ is not active but enabled and pending, we should direct
168 * it to its configured target VCPU.
169 * If the distributor is disabled, pending interrupts shouldn't be
172 if (irq
->enabled
&& irq_is_pending(irq
)) {
173 if (unlikely(irq
->target_vcpu
&&
174 !irq
->target_vcpu
->kvm
->arch
.vgic
.enabled
))
177 return irq
->target_vcpu
;
180 /* If neither active nor pending and enabled, then this IRQ should not
181 * be queued to any VCPU.
187 * The order of items in the ap_lists defines how we'll pack things in LRs as
188 * well, the first items in the list being the first things populated in the
191 * A hard rule is that active interrupts can never be pushed out of the LRs
192 * (and therefore take priority) since we cannot reliably trap on deactivation
193 * of IRQs and therefore they have to be present in the LRs.
195 * Otherwise things should be sorted by the priority field and the GIC
196 * hardware support will take care of preemption of priority groups etc.
198 * Return negative if "a" sorts before "b", 0 to preserve order, and positive
199 * to sort "b" before "a".
201 static int vgic_irq_cmp(void *priv
, struct list_head
*a
, struct list_head
*b
)
203 struct vgic_irq
*irqa
= container_of(a
, struct vgic_irq
, ap_list
);
204 struct vgic_irq
*irqb
= container_of(b
, struct vgic_irq
, ap_list
);
208 spin_lock(&irqa
->irq_lock
);
209 spin_lock_nested(&irqb
->irq_lock
, SINGLE_DEPTH_NESTING
);
211 if (irqa
->active
|| irqb
->active
) {
212 ret
= (int)irqb
->active
- (int)irqa
->active
;
216 penda
= irqa
->enabled
&& irq_is_pending(irqa
);
217 pendb
= irqb
->enabled
&& irq_is_pending(irqb
);
219 if (!penda
|| !pendb
) {
220 ret
= (int)pendb
- (int)penda
;
224 /* Both pending and enabled, sort by priority */
225 ret
= irqa
->priority
- irqb
->priority
;
227 spin_unlock(&irqb
->irq_lock
);
228 spin_unlock(&irqa
->irq_lock
);
232 /* Must be called with the ap_list_lock held */
233 static void vgic_sort_ap_list(struct kvm_vcpu
*vcpu
)
235 struct vgic_cpu
*vgic_cpu
= &vcpu
->arch
.vgic_cpu
;
237 DEBUG_SPINLOCK_BUG_ON(!spin_is_locked(&vgic_cpu
->ap_list_lock
));
239 list_sort(NULL
, &vgic_cpu
->ap_list_head
, vgic_irq_cmp
);
243 * Only valid injection if changing level for level-triggered IRQs or for a
244 * rising edge, and in-kernel connected IRQ lines can only be controlled by
247 static bool vgic_validate_injection(struct vgic_irq
*irq
, bool level
, void *owner
)
249 if (irq
->owner
!= owner
)
252 switch (irq
->config
) {
253 case VGIC_CONFIG_LEVEL
:
254 return irq
->line_level
!= level
;
255 case VGIC_CONFIG_EDGE
:
263 * Check whether an IRQ needs to (and can) be queued to a VCPU's ap list.
264 * Do the queuing if necessary, taking the right locks in the right order.
265 * Returns true when the IRQ was queued, false otherwise.
267 * Needs to be entered with the IRQ lock already held, but will return
268 * with all locks dropped.
270 bool vgic_queue_irq_unlock(struct kvm
*kvm
, struct vgic_irq
*irq
,
273 struct kvm_vcpu
*vcpu
;
275 DEBUG_SPINLOCK_BUG_ON(!spin_is_locked(&irq
->irq_lock
));
278 vcpu
= vgic_target_oracle(irq
);
279 if (irq
->vcpu
|| !vcpu
) {
281 * If this IRQ is already on a VCPU's ap_list, then it
282 * cannot be moved or modified and there is no more work for
285 * Otherwise, if the irq is not pending and enabled, it does
286 * not need to be inserted into an ap_list and there is also
287 * no more work for us to do.
289 spin_unlock_irqrestore(&irq
->irq_lock
, flags
);
292 * We have to kick the VCPU here, because we could be
293 * queueing an edge-triggered interrupt for which we
294 * get no EOI maintenance interrupt. In that case,
295 * while the IRQ is already on the VCPU's AP list, the
296 * VCPU could have EOI'ed the original interrupt and
297 * won't see this one until it exits for some other
301 kvm_make_request(KVM_REQ_IRQ_PENDING
, vcpu
);
308 * We must unlock the irq lock to take the ap_list_lock where
309 * we are going to insert this new pending interrupt.
311 spin_unlock_irqrestore(&irq
->irq_lock
, flags
);
313 /* someone can do stuff here, which we re-check below */
315 spin_lock_irqsave(&vcpu
->arch
.vgic_cpu
.ap_list_lock
, flags
);
316 spin_lock(&irq
->irq_lock
);
319 * Did something change behind our backs?
321 * There are two cases:
322 * 1) The irq lost its pending state or was disabled behind our
323 * backs and/or it was queued to another VCPU's ap_list.
324 * 2) Someone changed the affinity on this irq behind our
325 * backs and we are now holding the wrong ap_list_lock.
327 * In both cases, drop the locks and retry.
330 if (unlikely(irq
->vcpu
|| vcpu
!= vgic_target_oracle(irq
))) {
331 spin_unlock(&irq
->irq_lock
);
332 spin_unlock_irqrestore(&vcpu
->arch
.vgic_cpu
.ap_list_lock
, flags
);
334 spin_lock_irqsave(&irq
->irq_lock
, flags
);
339 * Grab a reference to the irq to reflect the fact that it is
340 * now in the ap_list.
342 vgic_get_irq_kref(irq
);
343 list_add_tail(&irq
->ap_list
, &vcpu
->arch
.vgic_cpu
.ap_list_head
);
346 spin_unlock(&irq
->irq_lock
);
347 spin_unlock_irqrestore(&vcpu
->arch
.vgic_cpu
.ap_list_lock
, flags
);
349 kvm_make_request(KVM_REQ_IRQ_PENDING
, vcpu
);
356 * kvm_vgic_inject_irq - Inject an IRQ from a device to the vgic
357 * @kvm: The VM structure pointer
358 * @cpuid: The CPU for PPIs
359 * @intid: The INTID to inject a new state to.
360 * @level: Edge-triggered: true: to trigger the interrupt
361 * false: to ignore the call
362 * Level-sensitive true: raise the input signal
363 * false: lower the input signal
364 * @owner: The opaque pointer to the owner of the IRQ being raised to verify
365 * that the caller is allowed to inject this IRQ. Userspace
366 * injections will have owner == NULL.
368 * The VGIC is not concerned with devices being active-LOW or active-HIGH for
369 * level-sensitive interrupts. You can think of the level parameter as 1
370 * being HIGH and 0 being LOW and all devices being active-HIGH.
372 int kvm_vgic_inject_irq(struct kvm
*kvm
, int cpuid
, unsigned int intid
,
373 bool level
, void *owner
)
375 struct kvm_vcpu
*vcpu
;
376 struct vgic_irq
*irq
;
380 trace_vgic_update_irq_pending(cpuid
, intid
, level
);
382 ret
= vgic_lazy_init(kvm
);
386 vcpu
= kvm_get_vcpu(kvm
, cpuid
);
387 if (!vcpu
&& intid
< VGIC_NR_PRIVATE_IRQS
)
390 irq
= vgic_get_irq(kvm
, vcpu
, intid
);
394 spin_lock_irqsave(&irq
->irq_lock
, flags
);
396 if (!vgic_validate_injection(irq
, level
, owner
)) {
397 /* Nothing to see here, move along... */
398 spin_unlock_irqrestore(&irq
->irq_lock
, flags
);
399 vgic_put_irq(kvm
, irq
);
403 if (irq
->config
== VGIC_CONFIG_LEVEL
)
404 irq
->line_level
= level
;
406 irq
->pending_latch
= true;
408 vgic_queue_irq_unlock(kvm
, irq
, flags
);
409 vgic_put_irq(kvm
, irq
);
414 /* @irq->irq_lock must be held */
415 static int kvm_vgic_map_irq(struct kvm_vcpu
*vcpu
, struct vgic_irq
*irq
,
416 unsigned int host_irq
)
418 struct irq_desc
*desc
;
419 struct irq_data
*data
;
422 * Find the physical IRQ number corresponding to @host_irq
424 desc
= irq_to_desc(host_irq
);
426 kvm_err("%s: no interrupt descriptor\n", __func__
);
429 data
= irq_desc_get_irq_data(desc
);
430 while (data
->parent_data
)
431 data
= data
->parent_data
;
434 irq
->host_irq
= host_irq
;
435 irq
->hwintid
= data
->hwirq
;
439 /* @irq->irq_lock must be held */
440 static inline void kvm_vgic_unmap_irq(struct vgic_irq
*irq
)
446 int kvm_vgic_map_phys_irq(struct kvm_vcpu
*vcpu
, unsigned int host_irq
,
449 struct vgic_irq
*irq
= vgic_get_irq(vcpu
->kvm
, vcpu
, vintid
);
455 spin_lock_irqsave(&irq
->irq_lock
, flags
);
456 ret
= kvm_vgic_map_irq(vcpu
, irq
, host_irq
);
457 spin_unlock_irqrestore(&irq
->irq_lock
, flags
);
458 vgic_put_irq(vcpu
->kvm
, irq
);
464 * kvm_vgic_reset_mapped_irq - Reset a mapped IRQ
465 * @vcpu: The VCPU pointer
466 * @vintid: The INTID of the interrupt
468 * Reset the active and pending states of a mapped interrupt. Kernel
469 * subsystems injecting mapped interrupts should reset their interrupt lines
470 * when we are doing a reset of the VM.
472 void kvm_vgic_reset_mapped_irq(struct kvm_vcpu
*vcpu
, u32 vintid
)
474 struct vgic_irq
*irq
= vgic_get_irq(vcpu
->kvm
, vcpu
, vintid
);
480 spin_lock_irqsave(&irq
->irq_lock
, flags
);
482 irq
->pending_latch
= false;
483 irq
->line_level
= false;
484 spin_unlock_irqrestore(&irq
->irq_lock
, flags
);
486 vgic_put_irq(vcpu
->kvm
, irq
);
489 int kvm_vgic_unmap_phys_irq(struct kvm_vcpu
*vcpu
, unsigned int vintid
)
491 struct vgic_irq
*irq
;
494 if (!vgic_initialized(vcpu
->kvm
))
497 irq
= vgic_get_irq(vcpu
->kvm
, vcpu
, vintid
);
500 spin_lock_irqsave(&irq
->irq_lock
, flags
);
501 kvm_vgic_unmap_irq(irq
);
502 spin_unlock_irqrestore(&irq
->irq_lock
, flags
);
503 vgic_put_irq(vcpu
->kvm
, irq
);
509 * kvm_vgic_set_owner - Set the owner of an interrupt for a VM
511 * @vcpu: Pointer to the VCPU (used for PPIs)
512 * @intid: The virtual INTID identifying the interrupt (PPI or SPI)
513 * @owner: Opaque pointer to the owner
515 * Returns 0 if intid is not already used by another in-kernel device and the
516 * owner is set, otherwise returns an error code.
518 int kvm_vgic_set_owner(struct kvm_vcpu
*vcpu
, unsigned int intid
, void *owner
)
520 struct vgic_irq
*irq
;
524 if (!vgic_initialized(vcpu
->kvm
))
527 /* SGIs and LPIs cannot be wired up to any device */
528 if (!irq_is_ppi(intid
) && !vgic_valid_spi(vcpu
->kvm
, intid
))
531 irq
= vgic_get_irq(vcpu
->kvm
, vcpu
, intid
);
532 spin_lock_irqsave(&irq
->irq_lock
, flags
);
533 if (irq
->owner
&& irq
->owner
!= owner
)
537 spin_unlock_irqrestore(&irq
->irq_lock
, flags
);
543 * vgic_prune_ap_list - Remove non-relevant interrupts from the list
545 * @vcpu: The VCPU pointer
547 * Go over the list of "interesting" interrupts, and prune those that we
548 * won't have to consider in the near future.
550 static void vgic_prune_ap_list(struct kvm_vcpu
*vcpu
)
552 struct vgic_cpu
*vgic_cpu
= &vcpu
->arch
.vgic_cpu
;
553 struct vgic_irq
*irq
, *tmp
;
557 spin_lock_irqsave(&vgic_cpu
->ap_list_lock
, flags
);
559 list_for_each_entry_safe(irq
, tmp
, &vgic_cpu
->ap_list_head
, ap_list
) {
560 struct kvm_vcpu
*target_vcpu
, *vcpuA
, *vcpuB
;
562 spin_lock(&irq
->irq_lock
);
564 BUG_ON(vcpu
!= irq
->vcpu
);
566 target_vcpu
= vgic_target_oracle(irq
);
570 * We don't need to process this interrupt any
571 * further, move it off the list.
573 list_del(&irq
->ap_list
);
575 spin_unlock(&irq
->irq_lock
);
578 * This vgic_put_irq call matches the
579 * vgic_get_irq_kref in vgic_queue_irq_unlock,
580 * where we added the LPI to the ap_list. As
581 * we remove the irq from the list, we drop
582 * also drop the refcount.
584 vgic_put_irq(vcpu
->kvm
, irq
);
588 if (target_vcpu
== vcpu
) {
589 /* We're on the right CPU */
590 spin_unlock(&irq
->irq_lock
);
594 /* This interrupt looks like it has to be migrated. */
596 spin_unlock(&irq
->irq_lock
);
597 spin_unlock_irqrestore(&vgic_cpu
->ap_list_lock
, flags
);
600 * Ensure locking order by always locking the smallest
603 if (vcpu
->vcpu_id
< target_vcpu
->vcpu_id
) {
611 spin_lock_irqsave(&vcpuA
->arch
.vgic_cpu
.ap_list_lock
, flags
);
612 spin_lock_nested(&vcpuB
->arch
.vgic_cpu
.ap_list_lock
,
613 SINGLE_DEPTH_NESTING
);
614 spin_lock(&irq
->irq_lock
);
617 * If the affinity has been preserved, move the
618 * interrupt around. Otherwise, it means things have
619 * changed while the interrupt was unlocked, and we
620 * need to replay this.
622 * In all cases, we cannot trust the list not to have
623 * changed, so we restart from the beginning.
625 if (target_vcpu
== vgic_target_oracle(irq
)) {
626 struct vgic_cpu
*new_cpu
= &target_vcpu
->arch
.vgic_cpu
;
628 list_del(&irq
->ap_list
);
629 irq
->vcpu
= target_vcpu
;
630 list_add_tail(&irq
->ap_list
, &new_cpu
->ap_list_head
);
633 spin_unlock(&irq
->irq_lock
);
634 spin_unlock(&vcpuB
->arch
.vgic_cpu
.ap_list_lock
);
635 spin_unlock_irqrestore(&vcpuA
->arch
.vgic_cpu
.ap_list_lock
, flags
);
639 spin_unlock_irqrestore(&vgic_cpu
->ap_list_lock
, flags
);
642 static inline void vgic_fold_lr_state(struct kvm_vcpu
*vcpu
)
644 if (kvm_vgic_global_state
.type
== VGIC_V2
)
645 vgic_v2_fold_lr_state(vcpu
);
647 vgic_v3_fold_lr_state(vcpu
);
650 /* Requires the irq_lock to be held. */
651 static inline void vgic_populate_lr(struct kvm_vcpu
*vcpu
,
652 struct vgic_irq
*irq
, int lr
)
654 DEBUG_SPINLOCK_BUG_ON(!spin_is_locked(&irq
->irq_lock
));
656 if (kvm_vgic_global_state
.type
== VGIC_V2
)
657 vgic_v2_populate_lr(vcpu
, irq
, lr
);
659 vgic_v3_populate_lr(vcpu
, irq
, lr
);
662 static inline void vgic_clear_lr(struct kvm_vcpu
*vcpu
, int lr
)
664 if (kvm_vgic_global_state
.type
== VGIC_V2
)
665 vgic_v2_clear_lr(vcpu
, lr
);
667 vgic_v3_clear_lr(vcpu
, lr
);
670 static inline void vgic_set_underflow(struct kvm_vcpu
*vcpu
)
672 if (kvm_vgic_global_state
.type
== VGIC_V2
)
673 vgic_v2_set_underflow(vcpu
);
675 vgic_v3_set_underflow(vcpu
);
678 static inline void vgic_set_npie(struct kvm_vcpu
*vcpu
)
680 if (kvm_vgic_global_state
.type
== VGIC_V2
)
681 vgic_v2_set_npie(vcpu
);
683 vgic_v3_set_npie(vcpu
);
686 /* Requires the ap_list_lock to be held. */
687 static int compute_ap_list_depth(struct kvm_vcpu
*vcpu
,
690 struct vgic_cpu
*vgic_cpu
= &vcpu
->arch
.vgic_cpu
;
691 struct vgic_irq
*irq
;
696 DEBUG_SPINLOCK_BUG_ON(!spin_is_locked(&vgic_cpu
->ap_list_lock
));
698 list_for_each_entry(irq
, &vgic_cpu
->ap_list_head
, ap_list
) {
699 spin_lock(&irq
->irq_lock
);
700 /* GICv2 SGIs can count for more than one... */
701 if (vgic_irq_is_sgi(irq
->intid
) && irq
->source
) {
702 int w
= hweight8(irq
->source
);
705 *multi_sgi
|= (w
> 1);
709 spin_unlock(&irq
->irq_lock
);
714 /* Requires the VCPU's ap_list_lock to be held. */
715 static void vgic_flush_lr_state(struct kvm_vcpu
*vcpu
)
717 struct vgic_cpu
*vgic_cpu
= &vcpu
->arch
.vgic_cpu
;
718 struct vgic_irq
*irq
;
724 DEBUG_SPINLOCK_BUG_ON(!spin_is_locked(&vgic_cpu
->ap_list_lock
));
726 count
= compute_ap_list_depth(vcpu
, &multi_sgi
);
727 if (count
> kvm_vgic_global_state
.nr_lr
|| multi_sgi
)
728 vgic_sort_ap_list(vcpu
);
732 list_for_each_entry(irq
, &vgic_cpu
->ap_list_head
, ap_list
) {
733 spin_lock(&irq
->irq_lock
);
736 * If we have multi-SGIs in the pipeline, we need to
737 * guarantee that they are all seen before any IRQ of
738 * lower priority. In that case, we need to filter out
739 * these interrupts by exiting early. This is easy as
740 * the AP list has been sorted already.
742 if (multi_sgi
&& irq
->priority
> prio
) {
743 spin_unlock(&irq
->irq_lock
);
747 if (likely(vgic_target_oracle(irq
) == vcpu
)) {
748 vgic_populate_lr(vcpu
, irq
, count
++);
752 prio
= irq
->priority
;
756 spin_unlock(&irq
->irq_lock
);
758 if (count
== kvm_vgic_global_state
.nr_lr
) {
759 if (!list_is_last(&irq
->ap_list
,
760 &vgic_cpu
->ap_list_head
))
761 vgic_set_underflow(vcpu
);
769 vcpu
->arch
.vgic_cpu
.used_lrs
= count
;
771 /* Nuke remaining LRs */
772 for ( ; count
< kvm_vgic_global_state
.nr_lr
; count
++)
773 vgic_clear_lr(vcpu
, count
);
776 /* Sync back the hardware VGIC state into our emulation after a guest's run. */
777 void kvm_vgic_sync_hwstate(struct kvm_vcpu
*vcpu
)
779 struct vgic_cpu
*vgic_cpu
= &vcpu
->arch
.vgic_cpu
;
781 WARN_ON(vgic_v4_sync_hwstate(vcpu
));
783 /* An empty ap_list_head implies used_lrs == 0 */
784 if (list_empty(&vcpu
->arch
.vgic_cpu
.ap_list_head
))
787 if (vgic_cpu
->used_lrs
)
788 vgic_fold_lr_state(vcpu
);
789 vgic_prune_ap_list(vcpu
);
792 /* Flush our emulation state into the GIC hardware before entering the guest. */
793 void kvm_vgic_flush_hwstate(struct kvm_vcpu
*vcpu
)
795 WARN_ON(vgic_v4_flush_hwstate(vcpu
));
798 * If there are no virtual interrupts active or pending for this
799 * VCPU, then there is no work to do and we can bail out without
800 * taking any lock. There is a potential race with someone injecting
801 * interrupts to the VCPU, but it is a benign race as the VCPU will
802 * either observe the new interrupt before or after doing this check,
803 * and introducing additional synchronization mechanism doesn't change
806 if (list_empty(&vcpu
->arch
.vgic_cpu
.ap_list_head
))
809 DEBUG_SPINLOCK_BUG_ON(!irqs_disabled());
811 spin_lock(&vcpu
->arch
.vgic_cpu
.ap_list_lock
);
812 vgic_flush_lr_state(vcpu
);
813 spin_unlock(&vcpu
->arch
.vgic_cpu
.ap_list_lock
);
816 void kvm_vgic_load(struct kvm_vcpu
*vcpu
)
818 if (unlikely(!vgic_initialized(vcpu
->kvm
)))
821 if (kvm_vgic_global_state
.type
== VGIC_V2
)
827 void kvm_vgic_put(struct kvm_vcpu
*vcpu
)
829 if (unlikely(!vgic_initialized(vcpu
->kvm
)))
832 if (kvm_vgic_global_state
.type
== VGIC_V2
)
838 int kvm_vgic_vcpu_pending_irq(struct kvm_vcpu
*vcpu
)
840 struct vgic_cpu
*vgic_cpu
= &vcpu
->arch
.vgic_cpu
;
841 struct vgic_irq
*irq
;
842 bool pending
= false;
845 if (!vcpu
->kvm
->arch
.vgic
.enabled
)
848 if (vcpu
->arch
.vgic_cpu
.vgic_v3
.its_vpe
.pending_last
)
851 spin_lock_irqsave(&vgic_cpu
->ap_list_lock
, flags
);
853 list_for_each_entry(irq
, &vgic_cpu
->ap_list_head
, ap_list
) {
854 spin_lock(&irq
->irq_lock
);
855 pending
= irq_is_pending(irq
) && irq
->enabled
;
856 spin_unlock(&irq
->irq_lock
);
862 spin_unlock_irqrestore(&vgic_cpu
->ap_list_lock
, flags
);
867 void vgic_kick_vcpus(struct kvm
*kvm
)
869 struct kvm_vcpu
*vcpu
;
873 * We've injected an interrupt, time to find out who deserves
876 kvm_for_each_vcpu(c
, vcpu
, kvm
) {
877 if (kvm_vgic_vcpu_pending_irq(vcpu
)) {
878 kvm_make_request(KVM_REQ_IRQ_PENDING
, vcpu
);
884 bool kvm_vgic_map_is_active(struct kvm_vcpu
*vcpu
, unsigned int vintid
)
886 struct vgic_irq
*irq
;
890 if (!vgic_initialized(vcpu
->kvm
))
893 irq
= vgic_get_irq(vcpu
->kvm
, vcpu
, vintid
);
894 spin_lock_irqsave(&irq
->irq_lock
, flags
);
895 map_is_active
= irq
->hw
&& irq
->active
;
896 spin_unlock_irqrestore(&irq
->irq_lock
, flags
);
897 vgic_put_irq(vcpu
->kvm
, irq
);
899 return map_is_active
;