From: Michael S. Tsirkin <mst@redhat.com>
Date: Sun, 5 Jul 2009 18:27:58 +0000 (+0300)
Subject: KVM: ignore msi request if !level
X-Git-Tag: firefly_0821_release~12973^2~92
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=07fb8bb29f5269f30afa6f1b3d941406677f6ad2;p=firefly-linux-kernel-4.4.55.git

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 56e696104d43..a9d7fd1f1d6a 100644
--- a/virt/kvm/irq_comm.c
+++ b/virt/kvm/irq_comm.c
@@ -139,7 +139,9 @@ int kvm_set_irq(struct kvm *kvm, int irq_source_id, int irq, int level)
 		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