1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (C) 2015, 2016 ARM Ltd.
6 #include <linux/interrupt.h>
9 #include <linux/kvm_host.h>
10 #include <linux/list_sort.h>
11 #include <linux/nospec.h>
13 #include <asm/kvm_hyp.h>
17 #define CREATE_TRACE_POINTS
20 struct vgic_global kvm_vgic_global_state __ro_after_init = {
21 .gicv3_cpuif = STATIC_KEY_FALSE_INIT,
25 * Locking order is always:
27 * its->cmd_lock (mutex)
28 * its->its_lock (mutex)
29 * vgic_cpu->ap_list_lock must be taken with IRQs disabled
30 * kvm->lpi_list_lock must be taken with IRQs disabled
31 * vgic_irq->irq_lock must be taken with IRQs disabled
33 * As the ap_list_lock might be taken from the timer interrupt handler,
34 * we have to disable IRQs before taking this lock and everything lower
37 * If you need to take multiple locks, always take the upper lock first,
38 * then the lower ones, e.g. first take the its_lock, then the irq_lock.
39 * If you are already holding a lock and need to take a higher one, you
40 * have to drop the lower ranking lock first and re-aquire it after having
41 * taken the upper one.
43 * When taking more than one ap_list_lock at the same time, always take the
44 * lowest numbered VCPU's ap_list_lock first, so:
45 * vcpuX->vcpu_id < vcpuY->vcpu_id:
46 * raw_spin_lock(vcpuX->arch.vgic_cpu.ap_list_lock);
47 * raw_spin_lock(vcpuY->arch.vgic_cpu.ap_list_lock);
49 * Since the VGIC must support injecting virtual interrupts from ISRs, we have
50 * to use the raw_spin_lock_irqsave/raw_spin_unlock_irqrestore versions of outer
51 * spinlocks for any lock that may be taken while injecting an interrupt.
55 * Iterate over the VM's list of mapped LPIs to find the one with a
56 * matching interrupt ID and return a reference to the IRQ structure.
58 static struct vgic_irq *vgic_get_lpi(struct kvm *kvm, u32 intid)
60 struct vgic_dist *dist = &kvm->arch.vgic;
61 struct vgic_irq *irq = NULL;
64 raw_spin_lock_irqsave(&dist->lpi_list_lock, flags);
66 list_for_each_entry(irq, &dist->lpi_list_head, lpi_list) {
67 if (irq->intid != intid)
71 * This increases the refcount, the caller is expected to
72 * call vgic_put_irq() later once it's finished with the IRQ.
74 vgic_get_irq_kref(irq);
80 raw_spin_unlock_irqrestore(&dist->lpi_list_lock, flags);
86 * This looks up the virtual interrupt ID to get the corresponding
87 * struct vgic_irq. It also increases the refcount, so any caller is expected
88 * to call vgic_put_irq() once it's finished with this IRQ.
90 struct vgic_irq *vgic_get_irq(struct kvm *kvm, struct kvm_vcpu *vcpu,
94 if (intid <= VGIC_MAX_PRIVATE) {
95 intid = array_index_nospec(intid, VGIC_MAX_PRIVATE + 1);
96 return &vcpu->arch.vgic_cpu.private_irqs[intid];
100 if (intid < (kvm->arch.vgic.nr_spis + VGIC_NR_PRIVATE_IRQS)) {
101 intid = array_index_nospec(intid, kvm->arch.vgic.nr_spis + VGIC_NR_PRIVATE_IRQS);
102 return &kvm->arch.vgic.spis[intid - VGIC_NR_PRIVATE_IRQS];
106 if (intid >= VGIC_MIN_LPI)
107 return vgic_get_lpi(kvm, intid);
109 WARN(1, "Looking up struct vgic_irq for reserved INTID");
114 * We can't do anything in here, because we lack the kvm pointer to
115 * lock and remove the item from the lpi_list. So we keep this function
116 * empty and use the return value of kref_put() to trigger the freeing.
118 static void vgic_irq_release(struct kref *ref)
122 void vgic_put_irq(struct kvm *kvm, struct vgic_irq *irq)
124 struct vgic_dist *dist = &kvm->arch.vgic;
127 if (irq->intid < VGIC_MIN_LPI)
130 raw_spin_lock_irqsave(&dist->lpi_list_lock, flags);
131 if (!kref_put(&irq->refcount, vgic_irq_release)) {
132 raw_spin_unlock_irqrestore(&dist->lpi_list_lock, flags);
136 list_del(&irq->lpi_list);
137 dist->lpi_list_count--;
138 raw_spin_unlock_irqrestore(&dist->lpi_list_lock, flags);
143 void vgic_flush_pending_lpis(struct kvm_vcpu *vcpu)
145 struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu;
146 struct vgic_irq *irq, *tmp;
149 raw_spin_lock_irqsave(&vgic_cpu->ap_list_lock, flags);
151 list_for_each_entry_safe(irq, tmp, &vgic_cpu->ap_list_head, ap_list) {
152 if (irq->intid >= VGIC_MIN_LPI) {
153 raw_spin_lock(&irq->irq_lock);
154 list_del(&irq->ap_list);
156 raw_spin_unlock(&irq->irq_lock);
157 vgic_put_irq(vcpu->kvm, irq);
161 raw_spin_unlock_irqrestore(&vgic_cpu->ap_list_lock, flags);
164 void vgic_irq_set_phys_pending(struct vgic_irq *irq, bool pending)
166 WARN_ON(irq_set_irqchip_state(irq->host_irq,
167 IRQCHIP_STATE_PENDING,
171 bool vgic_get_phys_line_level(struct vgic_irq *irq)
177 if (irq->get_input_level)
178 return irq->get_input_level(irq->intid);
180 WARN_ON(irq_get_irqchip_state(irq->host_irq,
181 IRQCHIP_STATE_PENDING,
186 /* Set/Clear the physical active state */
187 void vgic_irq_set_phys_active(struct vgic_irq *irq, bool active)
191 WARN_ON(irq_set_irqchip_state(irq->host_irq,
192 IRQCHIP_STATE_ACTIVE,
197 * kvm_vgic_target_oracle - compute the target vcpu for an irq
199 * @irq: The irq to route. Must be already locked.
201 * Based on the current state of the interrupt (enabled, pending,
202 * active, vcpu and target_vcpu), compute the next vcpu this should be
203 * given to. Return NULL if this shouldn't be injected at all.
205 * Requires the IRQ lock to be held.
207 static struct kvm_vcpu *vgic_target_oracle(struct vgic_irq *irq)
209 lockdep_assert_held(&irq->irq_lock);
211 /* If the interrupt is active, it must stay on the current vcpu */
213 return irq->vcpu ? : irq->target_vcpu;
216 * If the IRQ is not active but enabled and pending, we should direct
217 * it to its configured target VCPU.
218 * If the distributor is disabled, pending interrupts shouldn't be
221 if (irq->enabled && irq_is_pending(irq)) {
222 if (unlikely(irq->target_vcpu &&
223 !irq->target_vcpu->kvm->arch.vgic.enabled))
226 return irq->target_vcpu;
229 /* If neither active nor pending and enabled, then this IRQ should not
230 * be queued to any VCPU.
236 * The order of items in the ap_lists defines how we'll pack things in LRs as
237 * well, the first items in the list being the first things populated in the
240 * A hard rule is that active interrupts can never be pushed out of the LRs
241 * (and therefore take priority) since we cannot reliably trap on deactivation
242 * of IRQs and therefore they have to be present in the LRs.
244 * Otherwise things should be sorted by the priority field and the GIC
245 * hardware support will take care of preemption of priority groups etc.
247 * Return negative if "a" sorts before "b", 0 to preserve order, and positive
248 * to sort "b" before "a".
250 static int vgic_irq_cmp(void *priv, struct list_head *a, struct list_head *b)
252 struct vgic_irq *irqa = container_of(a, struct vgic_irq, ap_list);
253 struct vgic_irq *irqb = container_of(b, struct vgic_irq, ap_list);
257 raw_spin_lock(&irqa->irq_lock);
258 raw_spin_lock_nested(&irqb->irq_lock, SINGLE_DEPTH_NESTING);
260 if (irqa->active || irqb->active) {
261 ret = (int)irqb->active - (int)irqa->active;
265 penda = irqa->enabled && irq_is_pending(irqa);
266 pendb = irqb->enabled && irq_is_pending(irqb);
268 if (!penda || !pendb) {
269 ret = (int)pendb - (int)penda;
273 /* Both pending and enabled, sort by priority */
274 ret = irqa->priority - irqb->priority;
276 raw_spin_unlock(&irqb->irq_lock);
277 raw_spin_unlock(&irqa->irq_lock);
281 /* Must be called with the ap_list_lock held */
282 static void vgic_sort_ap_list(struct kvm_vcpu *vcpu)
284 struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu;
286 lockdep_assert_held(&vgic_cpu->ap_list_lock);
288 list_sort(NULL, &vgic_cpu->ap_list_head, vgic_irq_cmp);
292 * Only valid injection if changing level for level-triggered IRQs or for a
293 * rising edge, and in-kernel connected IRQ lines can only be controlled by
296 static bool vgic_validate_injection(struct vgic_irq *irq, bool level, void *owner)
298 if (irq->owner != owner)
301 switch (irq->config) {
302 case VGIC_CONFIG_LEVEL:
303 return irq->line_level != level;
304 case VGIC_CONFIG_EDGE:
312 * Check whether an IRQ needs to (and can) be queued to a VCPU's ap list.
313 * Do the queuing if necessary, taking the right locks in the right order.
314 * Returns true when the IRQ was queued, false otherwise.
316 * Needs to be entered with the IRQ lock already held, but will return
317 * with all locks dropped.
319 bool vgic_queue_irq_unlock(struct kvm *kvm, struct vgic_irq *irq,
322 struct kvm_vcpu *vcpu;
324 lockdep_assert_held(&irq->irq_lock);
327 vcpu = vgic_target_oracle(irq);
328 if (irq->vcpu || !vcpu) {
330 * If this IRQ is already on a VCPU's ap_list, then it
331 * cannot be moved or modified and there is no more work for
334 * Otherwise, if the irq is not pending and enabled, it does
335 * not need to be inserted into an ap_list and there is also
336 * no more work for us to do.
338 raw_spin_unlock_irqrestore(&irq->irq_lock, flags);
341 * We have to kick the VCPU here, because we could be
342 * queueing an edge-triggered interrupt for which we
343 * get no EOI maintenance interrupt. In that case,
344 * while the IRQ is already on the VCPU's AP list, the
345 * VCPU could have EOI'ed the original interrupt and
346 * won't see this one until it exits for some other
350 kvm_make_request(KVM_REQ_IRQ_PENDING, vcpu);
357 * We must unlock the irq lock to take the ap_list_lock where
358 * we are going to insert this new pending interrupt.
360 raw_spin_unlock_irqrestore(&irq->irq_lock, flags);
362 /* someone can do stuff here, which we re-check below */
364 raw_spin_lock_irqsave(&vcpu->arch.vgic_cpu.ap_list_lock, flags);
365 raw_spin_lock(&irq->irq_lock);
368 * Did something change behind our backs?
370 * There are two cases:
371 * 1) The irq lost its pending state or was disabled behind our
372 * backs and/or it was queued to another VCPU's ap_list.
373 * 2) Someone changed the affinity on this irq behind our
374 * backs and we are now holding the wrong ap_list_lock.
376 * In both cases, drop the locks and retry.
379 if (unlikely(irq->vcpu || vcpu != vgic_target_oracle(irq))) {
380 raw_spin_unlock(&irq->irq_lock);
381 raw_spin_unlock_irqrestore(&vcpu->arch.vgic_cpu.ap_list_lock,
384 raw_spin_lock_irqsave(&irq->irq_lock, flags);
389 * Grab a reference to the irq to reflect the fact that it is
390 * now in the ap_list.
392 vgic_get_irq_kref(irq);
393 list_add_tail(&irq->ap_list, &vcpu->arch.vgic_cpu.ap_list_head);
396 raw_spin_unlock(&irq->irq_lock);
397 raw_spin_unlock_irqrestore(&vcpu->arch.vgic_cpu.ap_list_lock, flags);
399 kvm_make_request(KVM_REQ_IRQ_PENDING, vcpu);
406 * kvm_vgic_inject_irq - Inject an IRQ from a device to the vgic
407 * @kvm: The VM structure pointer
408 * @cpuid: The CPU for PPIs
409 * @intid: The INTID to inject a new state to.
410 * @level: Edge-triggered: true: to trigger the interrupt
411 * false: to ignore the call
412 * Level-sensitive true: raise the input signal
413 * false: lower the input signal
414 * @owner: The opaque pointer to the owner of the IRQ being raised to verify
415 * that the caller is allowed to inject this IRQ. Userspace
416 * injections will have owner == NULL.
418 * The VGIC is not concerned with devices being active-LOW or active-HIGH for
419 * level-sensitive interrupts. You can think of the level parameter as 1
420 * being HIGH and 0 being LOW and all devices being active-HIGH.
422 int kvm_vgic_inject_irq(struct kvm *kvm, int cpuid, unsigned int intid,
423 bool level, void *owner)
425 struct kvm_vcpu *vcpu;
426 struct vgic_irq *irq;
430 trace_vgic_update_irq_pending(cpuid, intid, level);
432 ret = vgic_lazy_init(kvm);
436 vcpu = kvm_get_vcpu(kvm, cpuid);
437 if (!vcpu && intid < VGIC_NR_PRIVATE_IRQS)
440 irq = vgic_get_irq(kvm, vcpu, intid);
444 raw_spin_lock_irqsave(&irq->irq_lock, flags);
446 if (!vgic_validate_injection(irq, level, owner)) {
447 /* Nothing to see here, move along... */
448 raw_spin_unlock_irqrestore(&irq->irq_lock, flags);
449 vgic_put_irq(kvm, irq);
453 if (irq->config == VGIC_CONFIG_LEVEL)
454 irq->line_level = level;
456 irq->pending_latch = true;
458 vgic_queue_irq_unlock(kvm, irq, flags);
459 vgic_put_irq(kvm, irq);
464 /* @irq->irq_lock must be held */
465 static int kvm_vgic_map_irq(struct kvm_vcpu *vcpu, struct vgic_irq *irq,
466 unsigned int host_irq,
467 bool (*get_input_level)(int vindid))
469 struct irq_desc *desc;
470 struct irq_data *data;
473 * Find the physical IRQ number corresponding to @host_irq
475 desc = irq_to_desc(host_irq);
477 kvm_err("%s: no interrupt descriptor\n", __func__);
480 data = irq_desc_get_irq_data(desc);
481 while (data->parent_data)
482 data = data->parent_data;
485 irq->host_irq = host_irq;
486 irq->hwintid = data->hwirq;
487 irq->get_input_level = get_input_level;
491 /* @irq->irq_lock must be held */
492 static inline void kvm_vgic_unmap_irq(struct vgic_irq *irq)
496 irq->get_input_level = NULL;
499 int kvm_vgic_map_phys_irq(struct kvm_vcpu *vcpu, unsigned int host_irq,
500 u32 vintid, bool (*get_input_level)(int vindid))
502 struct vgic_irq *irq = vgic_get_irq(vcpu->kvm, vcpu, vintid);
508 raw_spin_lock_irqsave(&irq->irq_lock, flags);
509 ret = kvm_vgic_map_irq(vcpu, irq, host_irq, get_input_level);
510 raw_spin_unlock_irqrestore(&irq->irq_lock, flags);
511 vgic_put_irq(vcpu->kvm, irq);
517 * kvm_vgic_reset_mapped_irq - Reset a mapped IRQ
518 * @vcpu: The VCPU pointer
519 * @vintid: The INTID of the interrupt
521 * Reset the active and pending states of a mapped interrupt. Kernel
522 * subsystems injecting mapped interrupts should reset their interrupt lines
523 * when we are doing a reset of the VM.
525 void kvm_vgic_reset_mapped_irq(struct kvm_vcpu *vcpu, u32 vintid)
527 struct vgic_irq *irq = vgic_get_irq(vcpu->kvm, vcpu, vintid);
533 raw_spin_lock_irqsave(&irq->irq_lock, flags);
535 irq->pending_latch = false;
536 irq->line_level = false;
537 raw_spin_unlock_irqrestore(&irq->irq_lock, flags);
539 vgic_put_irq(vcpu->kvm, irq);
542 int kvm_vgic_unmap_phys_irq(struct kvm_vcpu *vcpu, unsigned int vintid)
544 struct vgic_irq *irq;
547 if (!vgic_initialized(vcpu->kvm))
550 irq = vgic_get_irq(vcpu->kvm, vcpu, vintid);
553 raw_spin_lock_irqsave(&irq->irq_lock, flags);
554 kvm_vgic_unmap_irq(irq);
555 raw_spin_unlock_irqrestore(&irq->irq_lock, flags);
556 vgic_put_irq(vcpu->kvm, irq);
562 * kvm_vgic_set_owner - Set the owner of an interrupt for a VM
564 * @vcpu: Pointer to the VCPU (used for PPIs)
565 * @intid: The virtual INTID identifying the interrupt (PPI or SPI)
566 * @owner: Opaque pointer to the owner
568 * Returns 0 if intid is not already used by another in-kernel device and the
569 * owner is set, otherwise returns an error code.
571 int kvm_vgic_set_owner(struct kvm_vcpu *vcpu, unsigned int intid, void *owner)
573 struct vgic_irq *irq;
577 if (!vgic_initialized(vcpu->kvm))
580 /* SGIs and LPIs cannot be wired up to any device */
581 if (!irq_is_ppi(intid) && !vgic_valid_spi(vcpu->kvm, intid))
584 irq = vgic_get_irq(vcpu->kvm, vcpu, intid);
585 raw_spin_lock_irqsave(&irq->irq_lock, flags);
586 if (irq->owner && irq->owner != owner)
590 raw_spin_unlock_irqrestore(&irq->irq_lock, flags);
596 * vgic_prune_ap_list - Remove non-relevant interrupts from the list
598 * @vcpu: The VCPU pointer
600 * Go over the list of "interesting" interrupts, and prune those that we
601 * won't have to consider in the near future.
603 static void vgic_prune_ap_list(struct kvm_vcpu *vcpu)
605 struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu;
606 struct vgic_irq *irq, *tmp;
608 DEBUG_SPINLOCK_BUG_ON(!irqs_disabled());
611 raw_spin_lock(&vgic_cpu->ap_list_lock);
613 list_for_each_entry_safe(irq, tmp, &vgic_cpu->ap_list_head, ap_list) {
614 struct kvm_vcpu *target_vcpu, *vcpuA, *vcpuB;
615 bool target_vcpu_needs_kick = false;
617 raw_spin_lock(&irq->irq_lock);
619 BUG_ON(vcpu != irq->vcpu);
621 target_vcpu = vgic_target_oracle(irq);
625 * We don't need to process this interrupt any
626 * further, move it off the list.
628 list_del(&irq->ap_list);
630 raw_spin_unlock(&irq->irq_lock);
633 * This vgic_put_irq call matches the
634 * vgic_get_irq_kref in vgic_queue_irq_unlock,
635 * where we added the LPI to the ap_list. As
636 * we remove the irq from the list, we drop
637 * also drop the refcount.
639 vgic_put_irq(vcpu->kvm, irq);
643 if (target_vcpu == vcpu) {
644 /* We're on the right CPU */
645 raw_spin_unlock(&irq->irq_lock);
649 /* This interrupt looks like it has to be migrated. */
651 raw_spin_unlock(&irq->irq_lock);
652 raw_spin_unlock(&vgic_cpu->ap_list_lock);
655 * Ensure locking order by always locking the smallest
658 if (vcpu->vcpu_id < target_vcpu->vcpu_id) {
666 raw_spin_lock(&vcpuA->arch.vgic_cpu.ap_list_lock);
667 raw_spin_lock_nested(&vcpuB->arch.vgic_cpu.ap_list_lock,
668 SINGLE_DEPTH_NESTING);
669 raw_spin_lock(&irq->irq_lock);
672 * If the affinity has been preserved, move the
673 * interrupt around. Otherwise, it means things have
674 * changed while the interrupt was unlocked, and we
675 * need to replay this.
677 * In all cases, we cannot trust the list not to have
678 * changed, so we restart from the beginning.
680 if (target_vcpu == vgic_target_oracle(irq)) {
681 struct vgic_cpu *new_cpu = &target_vcpu->arch.vgic_cpu;
683 list_del(&irq->ap_list);
684 irq->vcpu = target_vcpu;
685 list_add_tail(&irq->ap_list, &new_cpu->ap_list_head);
686 target_vcpu_needs_kick = true;
689 raw_spin_unlock(&irq->irq_lock);
690 raw_spin_unlock(&vcpuB->arch.vgic_cpu.ap_list_lock);
691 raw_spin_unlock(&vcpuA->arch.vgic_cpu.ap_list_lock);
693 if (target_vcpu_needs_kick) {
694 kvm_make_request(KVM_REQ_IRQ_PENDING, target_vcpu);
695 kvm_vcpu_kick(target_vcpu);
701 raw_spin_unlock(&vgic_cpu->ap_list_lock);
704 static inline void vgic_fold_lr_state(struct kvm_vcpu *vcpu)
706 if (kvm_vgic_global_state.type == VGIC_V2)
707 vgic_v2_fold_lr_state(vcpu);
709 vgic_v3_fold_lr_state(vcpu);
712 /* Requires the irq_lock to be held. */
713 static inline void vgic_populate_lr(struct kvm_vcpu *vcpu,
714 struct vgic_irq *irq, int lr)
716 lockdep_assert_held(&irq->irq_lock);
718 if (kvm_vgic_global_state.type == VGIC_V2)
719 vgic_v2_populate_lr(vcpu, irq, lr);
721 vgic_v3_populate_lr(vcpu, irq, lr);
724 static inline void vgic_clear_lr(struct kvm_vcpu *vcpu, int lr)
726 if (kvm_vgic_global_state.type == VGIC_V2)
727 vgic_v2_clear_lr(vcpu, lr);
729 vgic_v3_clear_lr(vcpu, lr);
732 static inline void vgic_set_underflow(struct kvm_vcpu *vcpu)
734 if (kvm_vgic_global_state.type == VGIC_V2)
735 vgic_v2_set_underflow(vcpu);
737 vgic_v3_set_underflow(vcpu);
740 /* Requires the ap_list_lock to be held. */
741 static int compute_ap_list_depth(struct kvm_vcpu *vcpu,
744 struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu;
745 struct vgic_irq *irq;
750 lockdep_assert_held(&vgic_cpu->ap_list_lock);
752 list_for_each_entry(irq, &vgic_cpu->ap_list_head, ap_list) {
755 raw_spin_lock(&irq->irq_lock);
756 /* GICv2 SGIs can count for more than one... */
757 w = vgic_irq_get_lr_count(irq);
758 raw_spin_unlock(&irq->irq_lock);
761 *multi_sgi |= (w > 1);
766 /* Requires the VCPU's ap_list_lock to be held. */
767 static void vgic_flush_lr_state(struct kvm_vcpu *vcpu)
769 struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu;
770 struct vgic_irq *irq;
775 lockdep_assert_held(&vgic_cpu->ap_list_lock);
777 count = compute_ap_list_depth(vcpu, &multi_sgi);
778 if (count > kvm_vgic_global_state.nr_lr || multi_sgi)
779 vgic_sort_ap_list(vcpu);
783 list_for_each_entry(irq, &vgic_cpu->ap_list_head, ap_list) {
784 raw_spin_lock(&irq->irq_lock);
787 * If we have multi-SGIs in the pipeline, we need to
788 * guarantee that they are all seen before any IRQ of
789 * lower priority. In that case, we need to filter out
790 * these interrupts by exiting early. This is easy as
791 * the AP list has been sorted already.
793 if (multi_sgi && irq->priority > prio) {
794 _raw_spin_unlock(&irq->irq_lock);
798 if (likely(vgic_target_oracle(irq) == vcpu)) {
799 vgic_populate_lr(vcpu, irq, count++);
802 prio = irq->priority;
805 raw_spin_unlock(&irq->irq_lock);
807 if (count == kvm_vgic_global_state.nr_lr) {
808 if (!list_is_last(&irq->ap_list,
809 &vgic_cpu->ap_list_head))
810 vgic_set_underflow(vcpu);
815 vcpu->arch.vgic_cpu.used_lrs = count;
817 /* Nuke remaining LRs */
818 for ( ; count < kvm_vgic_global_state.nr_lr; count++)
819 vgic_clear_lr(vcpu, count);
822 static inline bool can_access_vgic_from_kernel(void)
825 * GICv2 can always be accessed from the kernel because it is
826 * memory-mapped, and VHE systems can access GICv3 EL2 system
829 return !static_branch_unlikely(&kvm_vgic_global_state.gicv3_cpuif) || has_vhe();
832 static inline void vgic_save_state(struct kvm_vcpu *vcpu)
834 if (!static_branch_unlikely(&kvm_vgic_global_state.gicv3_cpuif))
835 vgic_v2_save_state(vcpu);
837 __vgic_v3_save_state(vcpu);
840 /* Sync back the hardware VGIC state into our emulation after a guest's run. */
841 void kvm_vgic_sync_hwstate(struct kvm_vcpu *vcpu)
843 struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu;
845 WARN_ON(vgic_v4_sync_hwstate(vcpu));
847 /* An empty ap_list_head implies used_lrs == 0 */
848 if (list_empty(&vcpu->arch.vgic_cpu.ap_list_head))
851 if (can_access_vgic_from_kernel())
852 vgic_save_state(vcpu);
854 if (vgic_cpu->used_lrs)
855 vgic_fold_lr_state(vcpu);
856 vgic_prune_ap_list(vcpu);
859 static inline void vgic_restore_state(struct kvm_vcpu *vcpu)
861 if (!static_branch_unlikely(&kvm_vgic_global_state.gicv3_cpuif))
862 vgic_v2_restore_state(vcpu);
864 __vgic_v3_restore_state(vcpu);
867 /* Flush our emulation state into the GIC hardware before entering the guest. */
868 void kvm_vgic_flush_hwstate(struct kvm_vcpu *vcpu)
870 WARN_ON(vgic_v4_flush_hwstate(vcpu));
873 * If there are no virtual interrupts active or pending for this
874 * VCPU, then there is no work to do and we can bail out without
875 * taking any lock. There is a potential race with someone injecting
876 * interrupts to the VCPU, but it is a benign race as the VCPU will
877 * either observe the new interrupt before or after doing this check,
878 * and introducing additional synchronization mechanism doesn't change
881 * Note that we still need to go through the whole thing if anything
882 * can be directly injected (GICv4).
884 if (list_empty(&vcpu->arch.vgic_cpu.ap_list_head) &&
885 !vgic_supports_direct_msis(vcpu->kvm))
888 DEBUG_SPINLOCK_BUG_ON(!irqs_disabled());
890 if (!list_empty(&vcpu->arch.vgic_cpu.ap_list_head)) {
891 raw_spin_lock(&vcpu->arch.vgic_cpu.ap_list_lock);
892 vgic_flush_lr_state(vcpu);
893 raw_spin_unlock(&vcpu->arch.vgic_cpu.ap_list_lock);
896 if (can_access_vgic_from_kernel())
897 vgic_restore_state(vcpu);
900 void kvm_vgic_load(struct kvm_vcpu *vcpu)
902 if (unlikely(!vgic_initialized(vcpu->kvm)))
905 if (kvm_vgic_global_state.type == VGIC_V2)
911 void kvm_vgic_put(struct kvm_vcpu *vcpu)
913 if (unlikely(!vgic_initialized(vcpu->kvm)))
916 if (kvm_vgic_global_state.type == VGIC_V2)
922 void kvm_vgic_vmcr_sync(struct kvm_vcpu *vcpu)
924 if (unlikely(!irqchip_in_kernel(vcpu->kvm)))
927 if (kvm_vgic_global_state.type == VGIC_V2)
928 vgic_v2_vmcr_sync(vcpu);
930 vgic_v3_vmcr_sync(vcpu);
933 int kvm_vgic_vcpu_pending_irq(struct kvm_vcpu *vcpu)
935 struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu;
936 struct vgic_irq *irq;
937 bool pending = false;
939 struct vgic_vmcr vmcr;
941 if (!vcpu->kvm->arch.vgic.enabled)
944 if (vcpu->arch.vgic_cpu.vgic_v3.its_vpe.pending_last)
947 vgic_get_vmcr(vcpu, &vmcr);
949 raw_spin_lock_irqsave(&vgic_cpu->ap_list_lock, flags);
951 list_for_each_entry(irq, &vgic_cpu->ap_list_head, ap_list) {
952 raw_spin_lock(&irq->irq_lock);
953 pending = irq_is_pending(irq) && irq->enabled &&
955 irq->priority < vmcr.pmr;
956 raw_spin_unlock(&irq->irq_lock);
962 raw_spin_unlock_irqrestore(&vgic_cpu->ap_list_lock, flags);
967 void vgic_kick_vcpus(struct kvm *kvm)
969 struct kvm_vcpu *vcpu;
973 * We've injected an interrupt, time to find out who deserves
976 kvm_for_each_vcpu(c, vcpu, kvm) {
977 if (kvm_vgic_vcpu_pending_irq(vcpu)) {
978 kvm_make_request(KVM_REQ_IRQ_PENDING, vcpu);
984 bool kvm_vgic_map_is_active(struct kvm_vcpu *vcpu, unsigned int vintid)
986 struct vgic_irq *irq;
990 if (!vgic_initialized(vcpu->kvm))
993 irq = vgic_get_irq(vcpu->kvm, vcpu, vintid);
994 raw_spin_lock_irqsave(&irq->irq_lock, flags);
995 map_is_active = irq->hw && irq->active;
996 raw_spin_unlock_irqrestore(&irq->irq_lock, flags);
997 vgic_put_irq(vcpu->kvm, irq);
999 return map_is_active;