linux-kernel - Re: [PATCH] Add virtio gpu driver.

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Message-ID: <1427297836.23304.29.camel@nilsson.home.kraxel.org>
Date:	Wed, 25 Mar 2015 16:37:16 +0100
From:	Gerd Hoffmann <kraxel@...hat.com>
To:	"Michael S. Tsirkin" <mst@...hat.com>
Cc:	virtio-dev@...ts.oasis-open.org, Dave Airlie <airlied@...il.com>,
	Dave Airlie <airlied@...hat.com>,
	David Airlie <airlied@...ux.ie>,
	Rusty Russell <rusty@...tcorp.com.au>,
	open list <linux-kernel@...r.kernel.org>,
	"open list:DRM DRIVERS" <dri-devel@...ts.freedesktop.org>,
	"open list:VIRTIO CORE, NET..." 
	<virtualization@...ts.linux-foundation.org>,
	"open list:ABI/API" <linux-api@...r.kernel.org>
Subject: Re: [PATCH] Add virtio gpu driver.

  Hi,

> BTW can we teach virtio-gpu to look for framebuffer using
> virtio pci caps?

The virtio-gpu driver doesn't matter much here, it doesn't use it
anyway.

>  Or are there limitations such as only
> using IO port BARs, or compatibility with
> BIOS code etc that limit us to specific BARs anyway?

Yes, vgabios code needs to know.  Currently it has bar #2 for the vga
framebuffer bar hardcoded.  It's 16bit code.  I don't feel like making
the probing more complicated ...

cheers,
  Gerd

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