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

[Michael liu <ztehypervisor@zte.com.cn>]

** Description changed:

  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,and the process of detaching usb-hub has already been executed,but failed.With adding print information,error as follows:
- libusbx: error [do_close] Device handle closed while transfer was still being processed, but the device is still connected as far as we know
- libusbx: warning [do_close] A cancellation for an in-flight transfer hasn't completed but closing the device handle
+ 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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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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