From 0880fa2082c85c393eb2ac28aeaaa83236196617 Mon Sep 17 00:00:00 2001 From: Marc Zyngier Date: Tue, 2 May 2017 14:30:39 +0100 Subject: [PATCH] KVM: arm/arm64: vgic-v2: Do not use Active+Pending state for a HW interrupt When an interrupt is injected with the HW bit set (indicating that deactivation should be propagated to the physical distributor), special care must be taken so that we never mark the corresponding LR with the Active+Pending state (as the pending state is kept in the physycal distributor). Cc: stable@vger.kernel.org Fixes: 12c7421915e2 ("KVM: arm/arm64: vgic-new: Add GICv2 world switch backend") Signed-off-by: Marc Zyngier Reviewed-by: Christoffer Dall Signed-off-by: Christoffer Dall --- virt/kvm/arm/vgic/vgic-v2.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/virt/kvm/arm/vgic/vgic-v2.c b/virt/kvm/arm/vgic/vgic-v2.c index a65757aab6d32..504b4bd0d651c 100644 --- a/virt/kvm/arm/vgic/vgic-v2.c +++ b/virt/kvm/arm/vgic/vgic-v2.c @@ -149,6 +149,13 @@ void vgic_v2_populate_lr(struct kvm_vcpu *vcpu, struct vgic_irq *irq, int lr) if (irq->hw) { val |= GICH_LR_HW; val |= irq->hwintid << GICH_LR_PHYSID_CPUID_SHIFT; + /* + * Never set pending+active on a HW interrupt, as the + * pending state is kept at the physical distributor + * level. + */ + if (irq->active && irq_is_pending(irq)) + val &= ~GICH_LR_PENDING_BIT; } else { if (irq->config == VGIC_CONFIG_LEVEL) val |= GICH_LR_EOI; -- 2.39.5