From: Marc Zyngier <marc.zyngier@arm.com>
Date: Thu, 16 Nov 2017 17:58:19 +0000
Subject: KVM: arm/arm64: vgic-v4: Only perform an unmap for valid vLPIs
Patch-mainline: v4.15-rc3
Git-commit: a05d1c0d03fd60ed487991e73850421e735c0135
References: bsc#1077761

Before performing an unmap, let's check that what we have was
really mapped the first place.

Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
Acked-by: Alexander Graf <agraf@suse.de>
---
 virt/kvm/arm/vgic/vgic-v4.c |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

--- a/virt/kvm/arm/vgic/vgic-v4.c
+++ b/virt/kvm/arm/vgic/vgic-v4.c
@@ -337,8 +337,10 @@
 		goto out;
 
 	WARN_ON(!(irq->hw && irq->host_irq == virq));
-	irq->hw = false;
-	ret = its_unmap_vlpi(virq);
+	if (irq->hw) {
+		irq->hw = false;
+		ret = its_unmap_vlpi(virq);
+	}
 
 out:
 	mutex_unlock(&its->its_lock);