path: root/virt/kvm/arm/vgic/vgic.c
diff options
authorChristoffer Dall <christoffer.dall@linaro.org>2017-10-27 19:30:09 +0200
committerChristoffer Dall <christoffer.dall@linaro.org>2018-01-02 10:05:46 +0100
commitb6909a659f8d5de2df36cabb1c0505d262996a24 (patch)
treee0aa8769ddd5f3203a071b9fc90331c08d5cec73 /virt/kvm/arm/vgic/vgic.c
parente40cc57bac792713ff6a1b80a1f67b54c05e5e21 (diff)
KVM: arm/arm64: Support a vgic interrupt line level sample function
The GIC sometimes need to sample the physical line of a mapped interrupt. As we know this to be notoriously slow, provide a callback function for devices (such as the timer) which can do this much faster than talking to the distributor, for example by comparing a few in-memory values. Fall back to the good old method of poking the physical GIC if no callback is provided. Reviewed-by: Marc Zyngier <marc.zyngier@arm.com> Reviewed-by: Eric Auger <eric.auger@redhat.com> Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
Diffstat (limited to 'virt/kvm/arm/vgic/vgic.c')
1 files changed, 9 insertions, 4 deletions
diff --git a/virt/kvm/arm/vgic/vgic.c b/virt/kvm/arm/vgic/vgic.c
index 4318e9edd075..d57b3bf8eb36 100644
--- a/virt/kvm/arm/vgic/vgic.c
+++ b/virt/kvm/arm/vgic/vgic.c
@@ -144,13 +144,15 @@ void vgic_put_irq(struct kvm *kvm, struct vgic_irq *irq)
-/* Get the input level of a mapped IRQ directly from the physical GIC */
bool vgic_get_phys_line_level(struct vgic_irq *irq)
bool line_level;
+ if (irq->get_input_level)
+ return irq->get_input_level(irq->intid);
@@ -436,7 +438,8 @@ int kvm_vgic_inject_irq(struct kvm *kvm, int cpuid, unsigned int intid,
/* @irq->irq_lock must be held */
static int kvm_vgic_map_irq(struct kvm_vcpu *vcpu, struct vgic_irq *irq,
- unsigned int host_irq)
+ unsigned int host_irq,
+ bool (*get_input_level)(int vindid))
struct irq_desc *desc;
struct irq_data *data;
@@ -456,6 +459,7 @@ static int kvm_vgic_map_irq(struct kvm_vcpu *vcpu, struct vgic_irq *irq,
irq->hw = true;
irq->host_irq = host_irq;
irq->hwintid = data->hwirq;
+ irq->get_input_level = get_input_level;
return 0;
@@ -464,10 +468,11 @@ static inline void kvm_vgic_unmap_irq(struct vgic_irq *irq)
irq->hw = false;
irq->hwintid = 0;
+ irq->get_input_level = NULL;
int kvm_vgic_map_phys_irq(struct kvm_vcpu *vcpu, unsigned int host_irq,
- u32 vintid)
+ u32 vintid, bool (*get_input_level)(int vindid))
struct vgic_irq *irq = vgic_get_irq(vcpu->kvm, vcpu, vintid);
unsigned long flags;
@@ -476,7 +481,7 @@ int kvm_vgic_map_phys_irq(struct kvm_vcpu *vcpu, unsigned int host_irq,
spin_lock_irqsave(&irq->irq_lock, flags);
- ret = kvm_vgic_map_irq(vcpu, irq, host_irq);
+ ret = kvm_vgic_map_irq(vcpu, irq, host_irq, get_input_level);
spin_unlock_irqrestore(&irq->irq_lock, flags);
vgic_put_irq(vcpu->kvm, irq);