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

[Roger Quadros <rogerq@xxxxxx>]



Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki. 
Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki

On 12/09/17 13:00, 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

Thanks, I'll give these a try. Looks like the kernel folks didn't take this in 
yet.
Are there some alternative plans to get this or something alternate upstream?

> 
> 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.

OK, this looks like a roadblock then. So it is possible to get this to
work but just needs some development or is this something that is not practical?

What are the alternatives for USB passthrough on ARM guest?

> 
> 
> Juergen
> 

-- 
cheers,
-roger


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