Patch "KVM: arm/arm64: vgic-v3: Do not use Active+Pending state for a HW interrupt" has been added to the 4.9-stable tree

This is a note to let you know that I've just added the patch titled

KVM: arm/arm64: vgic-v3: Do not use Active+Pending state for a HW interrupt

to the 4.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
kvm-arm-arm64-vgic-v3-do-not-use-active-pending-state-for-a-hw-interrupt.patch
and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Marc Zyngier <[email protected]>
Date: Tue, 2 May 2017 14:30:40 +0100
Subject: KVM: arm/arm64: vgic-v3: Do not use Active+Pending state for a HW interrupt

From: Marc Zyngier <[email protected]>

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).

---
 virt/kvm/arm/vgic/vgic-v3.c |    7 +++++++
 1 file changed, 7 insertions(+)

@@ -151,6 +151,13 @@ void vgic_v3_populate_lr(struct kvm_vcpu
 	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;

Patches currently in stable-queue which might be from [email protected] are

queue-4.9/arm64-kvm-allow-unaligned-accesses-at-el2.patch queue-4.9/arm-kvm-allow-unaligned-accesses-at-hyp.patch queue-4.9/kvm-arm-arm64-vgic-v3-do-not-use-active-pending-state-for-a-hw-interrupt.patch queue-4.9/arm64-kvm-preserve-res1-bits-in-sctlr_el2.patch queue-4.9/kvm-arm-arm64-vgic-v2-do-not-use-active-pending-state-for-a-hw-interrupt.patch