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

[Michael liu]

Public bug reported:

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

** Affects: qemu
     Importance: Undecided
         Status: New

** Summary changed:

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

** Summary changed:

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

** Description changed:

- I give a host usb device to guest in the way of passthrough,use "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）.
+ 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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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,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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