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[Qemu-devel] [Bug 1586613] [NEW] usb-hub can not be detached when detach


From: Michael liu
Subject: [Qemu-devel] [Bug 1586613] [NEW] usb-hub can not be detached when detach usbdevice VM
Date: Sat, 28 May 2016 09:38:51 -0000

Public bug reported:

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).
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

-- 
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https://bugs.launchpad.net/bugs/1586613

Title:
  usb-hub can not be detached when detach usbdevice  VM

Status in QEMU:
  New

Bug description:
  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).
  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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