** Changed in: qemu
Assignee: (unassigned) => Michael liu (ztehypervisor)
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https://bugs.launchpad.net/bugs/1586611
Title:
usb-hub can not be detached when detach usb device from VM
Status in QEMU:
New
Bug description:
I give a host usb device to guest in the way of using "virsh attach-device"
cmd. In guest os,use "lsusb" cmd I can see two devices have been added,one is
usb device and the other is usb-hub（0409:55aa NEC Corp. Hub）.
when I use "virsh detach-device" detach the usb device,in guest os the
usb-hub was still exists.
It can create a bad impression when operating the VM,for example,suspend and
resume the VM,qemu would report that:
2016-05-24T12:03:54.434369Z qemu-kvm: Unknown savevm section or
instance '0000:00:01.2/2/usb-hub' 0
2016-05-24T12:03:54.434742Z qemu-kvm: load of migration failed:
Invalid argument
From qemu's code,it can be sure that the usb-hub is generated by
qemu,but could not be seen in xml file of libvirt. So when executing
the migration of VM or resuming VM after suspended,it report error
like "Unknown savevm section or instance '0000:00:01.2/2/usb-hub' 0"
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