KVM: ignore msi request if !level
Irqfd sets level for interrupt to 1 and then to 0.
For MSI, check level so that a single message is sent.
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
diff --git a/virt/kvm/irq_comm.c b/virt/kvm/irq_comm.c
index 56e6961..a9d7fd1 100644
--- a/virt/kvm/irq_comm.c
+++ b/virt/kvm/irq_comm.c
@@ -139,7 +139,9 @@
else
clear_bit(irq_source_id, irq_state);
sig_level = !!(*irq_state);
- } else /* Deal with MSI/MSI-X */
+ } else if (!level)
+ return ret;
+ else /* Deal with MSI/MSI-X */
sig_level = 1;
/* Not possible to detect if the guest uses the PIC or the