Re: [Xen-devel] [PATCH 3/3] libxl: add new pvusb backend "qusb" provided by qemu

[Juergen Gross <jgross@xxxxxxxx>]

On 24/03/16 21:07, Wei Liu wrote:
> On Fri, Mar 18, 2016 at 09:24:26AM +0100, Juergen Gross wrote:
>> On 17/03/16 17:55, George Dunlap wrote:
>>> On Thu, Mar 10, 2016 at 3:00 PM, Juergen Gross <jgross@xxxxxxxx> wrote:
>>>> Add a new pvusb backend type "qusb" which is provided by qemu. It can
>>>> be selected either by specifying the type directly in the configuration
>>>> or it is selected automatically by libxl in case there is no "usbback"
>>>> driver loaded.
>>>>
>>>> Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
>>>
>>> Oh, last thing -- shouldn't we have a way for libxl to tell whether
>>> qemu can provide a qusb backend before we offer to start it up?
>>
>> How? Is this possible for qdisk? Or for an emulated frame buffer?
>>
> 
> I don't think it is  possible at the moment. But I think you might be
> able to do it either via qmp command or parsing qemu help string. The
> latter functionality is implemented in Ian's device model deprivilege
> patch series IIRC -- but it is not yet merged either.

Won't help for qusb, as there is no qemu parameter or help text related
to the backend. It would be possible to add a qmp command to print the
supported backend types, of course.

Juergen


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