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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 07:50:09 -0000 |
I found that when I attached an usb device to the VM, the VM would add an
usb-hub automatically if there was no usb-hub.
After adding an usb-hub,the VM assigned a port to the actual usb device. When
detaching the usb device,the qemu only detach the port,without detaching the
usb-hub.So when doing action like migrating or suspending/resumming,the VM will
fail.
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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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