[Qemu-devel] [Bug 1586611] Re: usb-hub can not be detached when detach usb device from VM

[Gerd Hoffmann]

Use a newer libvirt version which manages usb addressing and assigns usb
devices to usb ports.  This is required to make sure the physical device
tree is the same after vmsave/vmload or live migration.

** Changed in: qemu
       Status: New => Invalid

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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:
  Invalid

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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