Re: [Embedded-pv-devel] [PATCH] drmif: add ABI for para-virtual DRM/KMS

From: "Jan Beulich" <JBeulich@suse.com>
To: Oleksandr Andrushchenko <andr2000@gmail.com>
Cc: Lars Kurth <lars.kurth@citrix.com>,
	Iurii Konovalenko <iurii.konovalenko@globallogic.com>,
	xen-devel@lists.xensource.com,
	Volodymyr Babchuk <vlad.babchuk@gmail.com>,
	Tim Deegan <tim@xen.org>,
	Dario Faggioli <dario.faggioli@citrix.com>,
	ian.jackson@eu.citrix.com, al1img@gmail.com,
	Andrii Anisov <andrii.anisov@gmail.com>,
	Oleksandr Tyshchenko <olekstysh@gmail.com>,
	embedded-pv-devel <embedded-pv-devel@lists.xenproject.org>,
	Julien Grall <julien.grall@arm.com>,
	David Vrabel <david.vrabel@citrix.com>,
	Oleksandr Dmytryshyn <oleksandr.dmytryshyn@globallogic.com>,
	Mygaiev Artem <joculator@gmail.com>
Subject: Re: [Embedded-pv-devel] [PATCH] drmif: add ABI for para-virtual DRM/KMS
Date: Thu, 24 Nov 2016 09:06:26 -0700	[thread overview]
Message-ID: <58371E120200007800121E08@prv-mh.provo.novell.com> (raw)
In-Reply-To: <CANY+8dcWSK=afgJfLN2RMFT+iQH=qBZh2F2Wuqz82r5eV5XVdA@mail.gmail.com>

>>> On 24.11.16 at 16:44, <andr2000@gmail.com> wrote:
>>  One thing which I think you should have clarified up front is why
>> the existing fbfront is neither sufficient nor possible to extend
>> suitably.
> Framebuffer device is rather outdated way for Linux user-space
> to draw. All modern software expects DRM/KMS drivers and as
> a fallback *may* use fbdev. For that reason, there is a demand
> on DRM support for guests. So, it doesn't replace fbdev, but rather extend
>> Which gets me to a second aspect: The chosen name is
>> rather Linux centric - DRM has quite different a meaning in the
>> Windows world afaik.
>>
> Well, that was my intent: define ABI for *Linux DRM/KMS* protocol
> That said, it is still possible to implement back or front on Windows
> with this protocol if need be

Hmm, I think you want a PV Linux DRM/KMS driver, but that doesn't
mean you want/need a protocol by that name. The interface has
to describe virtual hardware, and I don't think you'd call a graphics
card "DRM/KMS card"? Hence also the question whether the existing
fbfront protocol couldn't be extended - after all modern graphics
(3D) cards have also evolved from simple frame buffer (2D) ones.

Jan

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