Re: Error connecting USB-device to DomU, kernel 2.6.32-5-xen-amd64, Xen 4.0.1

["Pasi Kärkkäinen" <pasik@iki.fi>]

On Tue, Mar 01, 2011 at 10:45:53AM +0200, Pasi Kärkkäinen wrote:
> On Tue, Mar 01, 2011 at 09:07:08AM +0100, Hans van Zijst wrote:
> > 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@lists.xensource.com
> > 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?
> > 
> 
> I don't think Debian Squeeze 2.6.32 kernel includes Xen PVUSB support/patches.
> 

Basicly you need xen-usbback driver in the dom0 kernel and 
xen-usbfront driver in the domU kernel.

http://wiki.xen.org/xenwiki/XenUSBPassthrough

See here for a pvusb patch for 2.6.32 pvops kernel: http://lists.xensource.com/archives/html/xen-devel/2011-01/msg00354.html

-- Pasi