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authorMarc Zyngier <marc.zyngier@arm.com>2017-05-02 16:30:39 +0300
committerChristoffer Dall <cdall@linaro.org>2017-05-15 12:31:43 +0300
commitddf42d068f8802de122bb7efdfcb3179336053f1 (patch)
tree3b9667a892f676fb3cd552749dd7e9beb4ee8092 /virt
parent501ad27c67ed0b90df465f23d33e9aed64058a47 (diff)
downloadlinux-ddf42d068f8802de122bb7efdfcb3179336053f1.tar.xz
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: 140b086dd197 ("KVM: arm/arm64: vgic-new: Add GICv2 world switch backend") Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Reviewed-by: Christoffer Dall <cdall@linaro.org> Signed-off-by: Christoffer Dall <cdall@linaro.org>
Diffstat (limited to 'virt')
-rw-r--r--virt/kvm/arm/vgic/vgic-v2.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/virt/kvm/arm/vgic/vgic-v2.c b/virt/kvm/arm/vgic/vgic-v2.c
index a65757aab6d3..504b4bd0d651 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;