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

[Juergen Gross <jgross@xxxxxxxx>]

On 13/09/17 12:48, Julien Grall wrote:
> 
> 
> On 09/13/2017 11:42 AM, Juergen Gross wrote:
>> On 13/09/17 12:33, Roger Quadros wrote:
>>> I resolved this issue by backporting the xen-hcd kernel patches to
>>> v3.14 and running the v3.14
>>> kernel in domU. Although I see this message in dom0. but it doesn't
>>> seem to cause any problems
>>> with the USB device in domU in my limited tests.
>>>
>>> [ 3495.812130] xhci-hcd xhci-hcd.1.auto: Setup ERROR: setup context
>>> command for slot 1.
>>> [ 3495.932104] xhci-hcd xhci-hcd.1.auto: Setup ERROR: setup context
>>> command for slot 1.
>>>
>>> One more question. Did I understand correctly that it is not possible
>>> to use full USB host emulation
>>> (usbctrl type=devicemodel) with a PV guest like Linux? If this
>>> understanding is wrong then some pointers
>>> on how to do that would be geat.
>>
>> I don't think this is supported by Xen on ARM.
>>
>> On x86 this is working with HVM or PV guests.
> 
> I am not sure to follow here. By fully emulated, I understand as no-PV
> driver but trapping MMIO access. So how can it work for PV on x86?

You are right, of course. Sorry for the noise.


Juergen


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