Re: [PATCH] Add virtio gpu driver.

[Michael S. Tsirkin]

On Wed, Mar 25, 2015 at 04:37:16PM +0100, Gerd Hoffmann wrote:
>   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

OK - you are saying all VGA cards use bar #2 for this
functionality, so we are just following
established practice here?

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