Re: [libvirt] [Qemu-devel] ask a question

Hi，I meet a problem with vm, my environment is qemu-kvm-2.3, virtio-win-0.1.126, host(centos7.2), guest(windows10). libvirt xml has four virtio-serial channel as follows:

<channel type='spicevmc'> <target type='virtio' name='com.redhat.spice.0' state='connected'/> <alias name='channel0'/> <address type='virtio-serial' controller='0' bus='0' port='1'/> </channel> <channel type='unix'> <source mode='bind' path='/var/lib/libvirt/qemu/e597eab9-95db-46e9-96f0-12a84c692569'/> <target type='virtio' name='pv-mon' state='connected'/> <alias name='channel1'/> <address type='virtio-serial' controller='0' bus='0' port='2'/> </channel> <channel type='unix'> <source mode='bind' path='/var/lib/libvirt/qemu/e597eab9-95db-46e9-96f0-12a84c692569-qga'/> <target type='virtio' name='org.qemu.guest_agent.0' state='connected'/> <alias name='channel2'/> <address type='virtio-serial' controller='0' bus='0' port='3'/> </channel> <channel type='unix'> <source mode='bind' path='/var/lib/libvirt/qemu/e597eab9-95db-46e9-96f0-12a84c692569-report'/> <target type='virtio' name='qga-active-report' state='connected'/> <alias name='channel3'/> <address type='virtio-serial' controller='0' bus='0' port='4'/> </channel> If I hard reboot the vm, it may happen as follows: 2017-08-14T07:51:18.401008Z qemu-kvm: virtio-serial-bus: Unexpected port id 1122983520 for device virtio-serial0.0 2017-08-14T07:51:18.956482Z qemu-kvm: virtio-serial-bus: Guest failure in adding device virtio-serial0.0 2017-08-14T07:51:29.176795Z qemu-kvm: virtio-serial-bus: Guest failure in adding device virtio-serial0.0 2017-08-14T07:51:34.454819Z qemu-kvm: virtio-serial-bus: Unexpected port id 2042451128 for device virtio-serial0.0 2017-08-14T07:51:44.655068Z qemu-kvm: virtio-serial-bus: Guest failure in adding device virtio-serial0.0 2017-08-14T07:51:49.764201Z qemu-kvm: virtio-serial-bus: Unexpected port id 1122983520 for device virtio-serial0.0 2017-08-14T07:51:59.969836Z qemu-kvm: virtio-serial-bus: Guest failure in adding device virtio-serial0.0 2017-08-14T07:52:21.564461Z qemu-kvm: virtio-serial-bus: Unexpected port id 1122983520 for device virtio-serial0.0 2017-08-14T07:52:47.059452Z qemu-kvm: virtio-serial-bus: Guest failure in adding device virtio-serial0.0 2017-08-14T07:53:22.710677Z qemu-kvm: virtio-serial-bus: Unexpected port id 1122983520 for device virtio-serial0.0 2017-08-14T07:53:32.781204Z qemu-kvm: virtio-serial-bus: Guest failure in adding device virtio-serial0.0 2017-08-14T07:53:48.040513Z qemu-kvm: virtio-serial-bus: Unexpected port id 3179968584 for device virtio-serial0.0 2017-08-14T07:54:23.547393Z qemu-kvm: virtio-serial-bus: Unexpected port id 1122983520 for device virtio-serial0.0 2017-08-14T07:55:54.350754Z qemu-kvm: virtio-serial-bus: Unexpected port id 1122983520 for device virtio-serial0.0 2017-08-14T07:56:09.393056Z qemu-kvm: virtio-serial-bus: Unexpected port id 1122983520 for device virtio-serial0.0 2017-08-14T07:57:39.670850Z qemu-kvm: virtio-serial-bus: Unexpected port id 1122983520 for device virtio-serial0.0 2017-08-14T07:58:09.867650Z qemu-kvm: virtio-serial-bus: Unexpected port id 1185792 for device virtio-serial0.0 2017-08-14T07:59:10.053208Z qemu-kvm: virtio-serial-bus: Unexpected port id 1122983520 for device virtio-serial0.0 2017-08-14T08:00:20.235162Z qemu-kvm: virtio-serial-bus: Guest failure in adding device virtio-serial0.0 2017-08-14T08:01:20.394196Z qemu-kvm: virtio-serial-bus: Guest failure in adding device virtio-serial0.0 So, the virtio-serial port will not be available, it cause my program doesn't start in guest(windows10). Can you give me some advices ? Looking forward to your reply.