[PATCH v5 18/26] KVM: arm/arm64: GICv4: Use pending_last as a scheduling hint

Marc Zyngier
2017-10-27T14:28:38Z

When a vPE exits, the pending_last flag is set when there are
pending VLPIs stored in the pending table. Similarily, we set
this flag when a doorbell interrupt fires, as it indicates the
same condition.

Let's update kvm_vgic_vcpu_pending_irq() to account for that
flag as well, making a vcpu runnable when set.

Acked-by: Christoffer Dall <cdall@linaro.org>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
---
virt/kvm/arm/vgic/vgic.c | 3 +++
1 file changed, 3 insertions(+)

diff --git a/virt/kvm/arm/vgic/vgic.c b/virt/kvm/arm/vgic/vgic.c
index 9d557efd1f7d..0691a2250949 100644
--- a/virt/kvm/arm/vgic/vgic.c
+++ b/virt/kvm/arm/vgic/vgic.c
@@ -769,6 +769,9 @@ int kvm_vgic_vcpu_pending_irq(struct kvm_vcpu *vcpu)
if (!vcpu->kvm->arch.vgic.enabled)
return false;

+ if (vcpu->arch.vgic_cpu.vgic_v3.its_vpe.pending_last)
+ return true;
+
spin_lock(&vgic_cpu->ap_list_lock);

list_for_each_entry(irq, &vgic_cpu->ap_list_head, ap_list) {
--
2.11.0