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authorMarc Zyngier <marc.zyngier@arm.com>2017-05-02 16:30:40 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2017-06-14 16:05:56 +0300
commit2a5c08a4d3fef6bc645c2ae0607f00672e367f75 (patch)
tree240e6e2b6ffcb475d16bf9505ef6b9988070abf6 /virt
parent81555e45852a69389a71167e913722714c91fd3f (diff)
downloadlinux-2a5c08a4d3fef6bc645c2ae0607f00672e367f75.tar.xz
KVM: arm/arm64: vgic-v3: Do not use Active+Pending state for a HW interrupt
commit 3d6e77ad1489650afa20da92bb589c8778baa8da upstream. 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). Fixes: 59529f69f504 ("KVM: arm/arm64: vgic-new: Add GICv3 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> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'virt')
-rw-r--r--virt/kvm/arm/vgic/vgic-v3.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/virt/kvm/arm/vgic/vgic-v3.c b/virt/kvm/arm/vgic/vgic-v3.c
index e6b03fd8c374..f1320063db28 100644
--- a/virt/kvm/arm/vgic/vgic-v3.c
+++ b/virt/kvm/arm/vgic/vgic-v3.c
@@ -151,6 +151,13 @@ void vgic_v3_populate_lr(struct kvm_vcpu *vcpu, struct vgic_irq *irq, int lr)
if (irq->hw) {
val |= ICH_LR_HW;
val |= ((u64)irq->hwintid) << ICH_LR_PHYS_ID_SHIFT;
+ /*
+ * Never set pending+active on a HW interrupt, as the
+ * pending state is kept at the physical distributor
+ * level.
+ */
+ if (irq->active && irq->pending)
+ val &= ~ICH_LR_PENDING_BIT;
} else {
if (irq->config == VGIC_CONFIG_LEVEL)
val |= ICH_LR_EOI;