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

[Julien Grall <julien.grall@xxxxxxx>]

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?
Cheers,

--
Julien Grall

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