Re: [Xen-devel] [PATCH V3 3/6] libxl: add pvusb API

[George Dunlap <George.Dunlap@xxxxxxxxxxxxx>]

On Tue, May 19, 2015 at 4:20 AM, Chun Yan Liu <cyliu@xxxxxxxx> wrote:
>>
>> > +static int libxl__device_usbctrl_setdefault(libxl__gc *gc, uint32_t domid,
>> > +                                            libxl_device_usbctrl *usbctrl)
>> > +{
>> > +    int rc;
>> > +
>> > +    if (!usbctrl->version)
>> > +        usbctrl->version = 2;
>> > +
>>
>> How hard would it be to implement USB 3? I assume this depends on QEMU's
>> support? I.e. we just need to specify the version to 3 and it should
>> just work? Just curious.
>
> This implementation is coworked with PVUSB  driver, so it depends on PVUSB
> driver's support. If PVUSB driver supports that, just specify the version to 
> 3 and
> can work.

I sort of got the idea that from the pvusb driver's perspective, the
1/2/3 thing was mostly just a number -- one that's important to the
USB device itself and the USB driver for those devices in the guest,
but less so for the pvusb layer.  Is that not the case?

 -George

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