[Xen-devel] Error connecting USB-device to DomU

[Hans van Zijst <hans@xxxxxxxxxxx>]

Hi,

When trying to connect my USB printer to the DomU that has CUPS
installed, I run into an error:

Unexpected error: <class 'xen.util.vusb_util.UsbDeviceParseError'>

Please report to xen-devel@xxxxxxxxxxxxxxxxxxx
Traceback (most recent call last):
  File "/usr/lib/xen-4.0/bin/xm", line 8, in <module>
    main.main(sys.argv)
  File "/usr/lib/xen-4.0/lib/python/xen/xm/main.py", line 3620, in main
    _, rc = _run_cmd(cmd, cmd_name, args)
  File "/usr/lib/xen-4.0/lib/python/xen/xm/main.py", line 3644, in _run_cmd
    return True, cmd(args)
  File "/usr/lib/xen-4.0/lib/python/xen/xm/main.py", line 2868, in
xm_usb_attach
    if vusb_util.bus_is_assigned(bus):
  File "/usr/lib/xen-4.0/lib/python/xen/util/vusb_util.py", line 275, in
bus_is_assigned
    raise UsbDeviceParseError("Can't get assignment status: (%s)." % bus)
xen.util.vusb_util.UsbDeviceParseError: vusb: Error parsing USB device
info: Can't get assignment status: (5-2).


I'm running Xen 4.0.1 on Debian Wheezy, kernel 2.6.32-5-xen-amd64, both
on Dom0 and the DomU.

I tried adding this line to the DomU's configuration:

vusb = [ 'usbver=2,numports=2,port_1=5-2,port_2=5-3' ]

which supposedly creates 2 USB ports on the DomU (I found a document on
the Internet describing PV-USB, but I can't find it anymore...). The
first port, 5-2, is the one to which the printer is connected.

After the DomU has booted, I issue "xm list-usb domu" on Dom0, which
gives me:

Idx BE  state usb-ver  BE-path
0   0   1     USB2.0  /local/domain/0/backend/vusb/14/0
port 1: 5-2 [ID 03f0:5511 HP Deskjet F300 series]
port 2: 5-3

So far, so good. The Dom0 seems to hand the printer to the DomU.
However, DomU doesn't seem to notice anything. When I do "lsusb" on it,
it bails out with:

unable to initialize libusb: -99

Manually loading the usbcore module and its friends doesn't help.

Now, if I explicitly connect this thing with:

xm usb-attach DomU 0 1 5-2

I get the error mentioned above.

Any ideas?

Kind regards,

Hans

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