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

From: Michael liu
Subject: [Qemu-devel] [Bug 1586611] Re: usb-hub can not be detached when detach usb device from VM
Date: Mon, 30 May 2016 08:14:19 -0000

Try detach the usb-hub device by the virsh detach-device usb-hub.xml?

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  usb-hub can not be detached when detach usb  device from VM

Status in QEMU:

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,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

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