From 3a54c6f81a0d8c8e7f29d1f161e1e863f44dd611 Mon Sep 17 00:00:00 2001 From: Andre Przywara Date: Tue, 17 Apr 2018 11:23:49 +0100 Subject: [PATCH] KVM: arm/arm64: vgic: Kick new VCPU on interrupt migration When vgic_prune_ap_list() finds an interrupt that needs to be migrated to a new VCPU, we should notify this VCPU of the pending interrupt, since it requires immediate action. Kick this VCPU once we have added the new IRQ to the list, but only after dropping the locks. Reported-by: Stefano Stabellini Reviewed-by: Christoffer Dall Signed-off-by: Andre Przywara Signed-off-by: Marc Zyngier --- virt/kvm/arm/vgic/vgic.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/virt/kvm/arm/vgic/vgic.c b/virt/kvm/arm/vgic/vgic.c index e74baec763613..4b6d72939c428 100644 --- a/virt/kvm/arm/vgic/vgic.c +++ b/virt/kvm/arm/vgic/vgic.c @@ -594,6 +594,7 @@ retry: list_for_each_entry_safe(irq, tmp, &vgic_cpu->ap_list_head, ap_list) { struct kvm_vcpu *target_vcpu, *vcpuA, *vcpuB; + bool target_vcpu_needs_kick = false; spin_lock(&irq->irq_lock); @@ -664,11 +665,18 @@ retry: list_del(&irq->ap_list); irq->vcpu = target_vcpu; list_add_tail(&irq->ap_list, &new_cpu->ap_list_head); + target_vcpu_needs_kick = true; } spin_unlock(&irq->irq_lock); spin_unlock(&vcpuB->arch.vgic_cpu.ap_list_lock); spin_unlock_irqrestore(&vcpuA->arch.vgic_cpu.ap_list_lock, flags); + + if (target_vcpu_needs_kick) { + kvm_make_request(KVM_REQ_IRQ_PENDING, target_vcpu); + kvm_vcpu_kick(target_vcpu); + } + goto retry; } -- 2.39.5