Re: [Embedded-pv-devel] [Xen-devel] [PATCH v1] displif: add ABI for para-virtual display

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 05.01.17 at 17:03, <andr2000@xxxxxxxxx> wrote:
> On 01/05/2017 05:45 PM, Jan Beulich wrote:
>>>>> On 22.12.16 at 09:12, <andr2000@xxxxxxxxx> wrote:
>> Other than that the primary thing I'm missing (as I think I've
>> mentioned elsewhere already) is a rationale of why this new
>> protocol is needed (and the existing xenfb one can't be extended).
> "This protocol aims to provide a unified protocol which fits more
> 
> sophisticated use-cases than a framebuffer device can handle. At the
> moment basic functionality is supported with the intention to extend:
>   o multiple dynamically allocated/destroyed framebuffers
>   o buffers of arbitrary sizes
>   o better configuration options including multiple display support"

Well, that's all stuff you had spelled out in the accompanying mail,
but that's all items which could be taken care of by a protocol
extension too.

> I tried to evaluate what would it be like to extend existing fbif...
> It looks like having 2 different protocols in a single file.

This is what I'd like you to expand on.

> What is more fbif can be used together with displif running at the
> same time, e.g. on Linux one provides framebuffer and another DRM

And this is certainly a valid argument (which hence should be
spelled out in the description).

Jan


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