[PATCH] KVM: arm64: ITS: return 1 on successful MSI injection

[Andre Przywara <andre.przywara@arm.com>]

According to the KVM API documentation a successful MSI injection
should return a value > 0 on success.
Since we pass the return value of vgic_its_inject_msi() directly on
to upper layers and userland, we need to use the same semantics here.
Briefly tested with QEMU and kvmtool on GICv3 hardware and the model.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
---
Applies on top of next-20160728. Let me know if I should use a
different base.

Cheers,
Andre.

 virt/kvm/arm/vgic/vgic-its.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/virt/kvm/arm/vgic/vgic-its.c b/virt/kvm/arm/vgic/vgic-its.c
index 07411cf..3268250 100644
--- a/virt/kvm/arm/vgic/vgic-its.c
+++ b/virt/kvm/arm/vgic/vgic-its.c
@@ -468,6 +468,7 @@ static void vgic_its_trigger_msi(struct kvm *kvm, struct vgic_its *its,
  * Queries the KVM IO bus framework to get the ITS pointer from the given
  * doorbell address.
  * We then call vgic_its_trigger_msi() with the decoded data.
+ * According to the KVM_SIGNAL_MSI API description returns > 0 on success.
  */
 int vgic_its_inject_msi(struct kvm *kvm, struct kvm_msi *msi)
 {
@@ -493,7 +494,7 @@ int vgic_its_inject_msi(struct kvm *kvm, struct kvm_msi *msi)
 	vgic_its_trigger_msi(kvm, iodev->its, msi->devid, msi->data);
 	mutex_unlock(&iodev->its->its_lock);
 
-	return 0;
+	return 1;
 }
 
 /* Requires the its_lock to be held. */
-- 
2.9.0