Patch "KVM: arm/arm64: vgic: Don't notify EOI for non-SPIs" has been added to the 4.8-stable tree

Patch "KVM: arm/arm64: vgic: Don't notify EOI for non-SPIs" has been added to the 4.8-stable tree

[gregkh]

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

    KVM: arm/arm64: vgic: Don't notify EOI for non-SPIs

to the 4.8-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-don-t-notify-eoi-for-non-spis.patch
and it can be found in the queue-4.8 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 8ca18eec2b2276b449c1dc86b98bf083c5fe4e09 Mon Sep 17 00:00:00 2001
From: Marc Zyngier <marc.zyngier@arm.com>
Date: Wed, 23 Nov 2016 10:11:21 +0000
Subject: KVM: arm/arm64: vgic: Don't notify EOI for non-SPIs

From: Marc Zyngier <marc.zyngier@arm.com>

commit 8ca18eec2b2276b449c1dc86b98bf083c5fe4e09 upstream.

When we inject a level triggerered interrupt (and unless it
is backed by the physical distributor - timer style), we request
a maintenance interrupt. Part of the processing for that interrupt
is to feed to the rest of KVM (and to the eventfd subsystem) the
information that the interrupt has been EOIed.

But that notification only makes sense for SPIs, and not PPIs
(such as the PMU interrupt). Skip over the notification if
the interrupt is not an SPI.

Fixes: 140b086dd197 ("KVM: arm/arm64: vgic-new: Add GICv2 world switch backend")
Fixes: 59529f69f504 ("KVM: arm/arm64: vgic-new: Add GICv3 world switch backend")
Reported-by: Catalin Marinas <catalin.marinas@arm.com>
Tested-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 virt/kvm/arm/vgic/vgic-v2.c |    6 ++++--
 virt/kvm/arm/vgic/vgic-v3.c |    6 ++++--
 2 files changed, 8 insertions(+), 4 deletions(-)

--- a/virt/kvm/arm/vgic/vgic-v2.c
+++ b/virt/kvm/arm/vgic/vgic-v2.c
@@ -50,8 +50,10 @@ void vgic_v2_process_maintenance(struct
 
 			WARN_ON(cpuif->vgic_lr[lr] & GICH_LR_STATE);
 
-			kvm_notify_acked_irq(vcpu->kvm, 0,
-					     intid - VGIC_NR_PRIVATE_IRQS);
+			/* Only SPIs require notification */
+			if (vgic_valid_spi(vcpu->kvm, intid))
+				kvm_notify_acked_irq(vcpu->kvm, 0,
+						     intid - VGIC_NR_PRIVATE_IRQS);
 		}
 	}
 
--- a/virt/kvm/arm/vgic/vgic-v3.c
+++ b/virt/kvm/arm/vgic/vgic-v3.c
@@ -41,8 +41,10 @@ void vgic_v3_process_maintenance(struct
 
 			WARN_ON(cpuif->vgic_lr[lr] & ICH_LR_STATE);
 
-			kvm_notify_acked_irq(vcpu->kvm, 0,
-					     intid - VGIC_NR_PRIVATE_IRQS);
+			/* Only SPIs require notification */
+			if (vgic_valid_spi(vcpu->kvm, intid))
+				kvm_notify_acked_irq(vcpu->kvm, 0,
+						     intid - VGIC_NR_PRIVATE_IRQS);
 		}
 
 		/*


Patches currently in stable-queue which might be from marc.zyngier@arm.com are

queue-4.8/kvm-arm-arm64-vgic-don-t-notify-eoi-for-non-spis.patch