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authorShanker Donthineni <shankerd@codeaurora.org>2017-02-02 20:30:03 -0600
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2017-03-12 06:41:48 +0100
commitd408d23addbaa9af9e0db492f774d3245ecfeefd (patch)
tree56edca2a74ba4bf2811c20114e8b438d7ab9b79c
parent7127d43e1843400658e42c0b21dc598a59d603e4 (diff)
KVM: arm/arm64: vgic: Stop injecting the MSI occurrence twice
commit 0bdbf3b071986ba80731203683cf623d5c0cacb1 upstream. The IRQFD framework calls the architecture dependent function twice if the corresponding GSI type is edge triggered. For ARM, the function kvm_set_msi() is getting called twice whenever the IRQFD receives the event signal. The rest of the code path is trying to inject the MSI without any validation checks. No need to call the function vgic_its_inject_msi() second time to avoid an unnecessary overhead in IRQ queue logic. It also avoids the possibility of VM seeing the MSI twice. Simple fix, return -1 if the argument 'level' value is zero. Reviewed-by: Eric Auger <eric.auger@redhat.com> Reviewed-by: Christoffer Dall <cdall@linaro.org> Signed-off-by: Shanker Donthineni <shankerd@codeaurora.org> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--virt/kvm/arm/vgic/vgic-irqfd.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/virt/kvm/arm/vgic/vgic-irqfd.c b/virt/kvm/arm/vgic/vgic-irqfd.c
index d918dcf26a5a..f138ed2e9c63 100644
--- a/virt/kvm/arm/vgic/vgic-irqfd.c
+++ b/virt/kvm/arm/vgic/vgic-irqfd.c
@@ -99,6 +99,9 @@ int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e,
if (!vgic_has_its(kvm))
return -ENODEV;
+ if (!level)
+ return -1;
+
return vgic_its_inject_msi(kvm, &msi);
}