KVM: Fix coalesced interrupt reporting in IOAPIC

This bug was introduced by b4a2f5e723e4f7df467.

Cc: stable@kernel.org
Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/virt/kvm/ioapic.c b/virt/kvm/ioapic.c
index fa05f67423ab..9fe140bb38ec 100644
--- a/virt/kvm/ioapic.c
+++ b/virt/kvm/ioapic.c
@@ -193,6 +193,8 @@ int kvm_ioapic_set_irq(struct kvm_ioapic *ioapic, int irq, int level)
                         if ((edge && old_irr != ioapic->irr) ||
                             (!edge && !entry.fields.remote_irr))
                                 ret = ioapic_service(ioapic, irq);
+                        else
+                                ret = 0; /* report coalesced interrupt */
                 }
                 trace_kvm_ioapic_set_irq(entry.bits, irq, ret == 0);
         }