** Description changed:
- VM hang because of pening interrups not reinjected.
+ [Impact]
+
+ After the VM(Guest OS is Windows Server 2012R2) has been live-migrated
+ several times, the screen is blacked out or freeze when the VM is
+ connected via VNC.
+
+ The Windows Guest OS Server has been investigated that all of kernel
+ threads of Windows Server OS are waiting(idle state) for interrupt
+ request(IRQ) from hypervisor.
+
+ The following environment is tested:
+ * Host OS: Ubuntu 14.04(kernel 3.13.0-40.69)
+ * qemu-kvm_2.0.0+dfsg-2ubuntu1.22
+ * libvert-bin_1.2.2-0ubuntu13.1.5
+ * nova-compute_1:2014.2.3-0ubuntu1.2~cloud0
+ * GuestOS: Windows Server 2012R2
+ * virtio-win-0.1.126
+
+
+ [Fix]
+
+ The patch set is needed:
+
+ 673f7b4257a1 KVM: ioapic: reinject pending interrupts on KVM_SET_IRQCHIP
+ 44847dea7975 KVM: ioapic: extract body of kvm_ioapic_set_irq
+ 0bc830b05c66 KVM: ioapic: clear IRR for edge-triggered interrupts at delivery
+ 0b10a1c87a2b KVM: ioapic: merge ioapic_deliver into ioapic_service
+
+
+ [Test]
+
+ Prepare two machines with the same environment mentioned above and run
+ the following script.
+
+ #!/bin/bash
+ INSTANCE="test"
+
+ FROM="elite"
+ virsh -c qemu+ssh://ubuntu@${FROM}/system list| grep -q ${INSTANCE}
+ if [[ $? != 0 ]]; then
+ FROM="dixie";
+ TO="elite";
+ else
+ TO="dixie"
+ fi
+
+ echo "= Migrating ${INSTANCE} from ${FROM} to ${TO} ="
+ ssh ubuntu@${FROM} -- virsh migrate --live --domain ${INSTANCE}
+ --desturi qemu+ssh://ubuntu@${TO}/system
+
+
+ The VNC script I use to keep track of the VNC console is:
+
+ #!/bin/bash
+ INSTANCE="test"
+
+ while true; do
+ HOST="elite"
+ virsh -c qemu+ssh://ubuntu@${HOST}/system list| grep -q ${INSTANCE}
+ if [[ $? != 0 ]]; then HOST="dixie"; fi
+
+ virt-viewer -c qemu+ssh://ubuntu@${HOST}/system test
+ sleep 3
+ done
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https://bugs.launchpad.net/bugs/1791286
Title:
The VM hang happens because of pending interrupts not reinjected when
migrating the VM several times
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