Re: [PATCH v1 0/2] libxl: add PV display device driver interface

[Ian Jackson <ian.jackson@eu.citrix.com>]

al1img . writes ("Re: [PATCH v1 0/2] libxl: add PV display device driver interface"):
> On Wed, Apr 5, 2017 at 2:05 PM, Ian Jackson <ian.jackson@eu.citrix.com> wrote:
> > Sorry to show my ignorance, but what is a "PV display device" ?
> > Where is the backend ?  What protocol do the frontend/backend speak ?
> 
> This is PV display device which provides virtual screens for frontends.
> We are working on the backend and frontend. They are currently under
> development.

Thanks for the reference to
   http://marc.info/?l=xen-devel&m=149137266022490&w=2
which was very helpful.

I think you should combine this series with that patch.  That patch
will need wider review and ack from Konrad (as our PV interface tsar);
AFAICT you're working on that, but I would like to be CC'd on the
mails too.

> > What are the parameters ?
> 
> It has two parameters:
>     * backend - specifies domain where the backend is running;
>     * beAlloc - indicated where display buffers should be allocated
> (see Backend buffer allocation in [3]);

I don't understand that, I'm afraid.  I guess what I'm missing in this
area is: the guest sees a virtual display device.  But how is this
presented/accessed/named/whatever on the host ?  I would expect to see
some configuraton for this in the libxl idl.

Thanks,
Ian.

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