Re: [Bug] PVUSB, Ubuntu 12.04, Xen 4.1.2

[Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>]

On Wed, May 29, 2013 at 05:14:08PM +0100, George Dunlap wrote:
> On Wed, May 29, 2013 at 4:08 PM, Erwan PILLET
> <erwan.pillet@telecom-bretagne.eu> wrote:
> > On 29 May 2013 15:25, George Dunlap <George.Dunlap@eu.citrix.com> wrote:
> >>
> >> On Wed, May 29, 2013 at 2:11 PM, Erwan PILLET
> >> <erwan.pillet@telecom-bretagne.eu> wrote:
> >> > Hi everyone,
> >> >
> >> > I installed xen from packages on Ubuntu 12.04, getting the version 4.1.2
> >> > .
> >> > I wanted to use pvusb which I understand was functional on this version
> >> > to
> >> > pass an USB hard drive to my DomU, but I only manage to get this error
> >> > trying to attach the device to a domain.
> >> >
> >> > It may also be worth mentionning that "xm usb-hc-destroy mydomu 0"
> >> > doesn't
> >> > have any effect, so it doesn't give back any error (I get one if I try
> >> > on an
> >> > unregistered devId) but don't remove the host controller.
> >> >
> >> > So should pvusb be fonctionnal on this version of xen/xm ? If yes, any
> >> > help
> >> > would be highly appreciated.
> >>
> >> PVUSB requires support both from the toolstack and from the dom0
> >> kernel.  I believe PVUSB is only available in "classic Xen" kernels
> >> such as those supported by SuSE; I'm pretty sure that Ubuntu does not
> >> have one.
> >>
> >> To see if usbback is present, you can do the following:
> >>
> >> ls /sys/bus/usb/drivers/usbback
> >>
> >> If it gives you an error, then the problem is that your Ubuntu dom0
> >> kernel doesn't have PVUSB support.
> >>
> >>  -George
> >
> >
> >
> > First, thanks for your help !
> > Indeed, there is no such file on my hypervisor, so I guess this kernel
> > doesn't support PVUSB.
> > Do you know if there is a way to patch the kernel to include this feature ?
> 
> I think there are some trees with PVUSB, but I don't think it's very
> reliable.  Konrad will know more.

There is devel/xen-usb.v1.1 in  git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen.git
but it is so old that I fear it has many bugs in it.

> 
>  -George