Re: [Xen-devel] USB passthrough with Xen on ARM

[Julien Grall <julien.grall@xxxxxxx>]

Hi,

On 12/09/17 11:00, Juergen Gross wrote:
> On 12/09/17 10:13, Roger Quadros wrote:
> > Hi,
> >
> > I'm running Xen v4.9 on DRA7 (OMAP5/ArmV7) with Linux kernel v3.14 (yikes!!) on 
> > dom0 and domU.
> > I'm struggling to get USB passthrough working using pvUSB.
> >
> > My domU config file contains
> >     usb = 1
> >     usbctrl = ['type=qusb,version=2,ports=4', 'type=qusb,version=1, ports=4', ]
> >
> > I can see the vusb-0 and vusb-1 platform devices in /sys/devices
> >
> > And the following message on domU kernel log
> > [    1.849572] xenbus_probe_frontend: Device with no driver: device/vusb/0
> > [    1.849627] xenbus_probe_frontend: Device with no driver: device/vusb/1
> >
> > This means that there is no device driver for the vusb host controllers.
> >
> > What is the way forward? Do I need to apply some patches to the domU kernel to
> > add support for the USB frontend HCD drivers?
> This is one mandatory step, yes. You'll need:
>
> https://lkml.org/lkml/2015/6/23/34
> https://lkml.org/lkml/2015/6/23/36
>
> The question is whether this will be enough for you to make it work: the
> pvusb backend is qemu based. I'm not sure this will just work on ARM.
Backends in QEMU should just work with ARM. Although, I haven't tried 
the PVUSB one.
Cheers,

--
Julien Grall

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