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SubjectRe: [PATCH] Add virtio gpu driver.
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On Mi, 2015-03-25 at 18:09 +0100, Michael S. Tsirkin wrote:
> 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?

vgabios checks pci ids to figure. qxl+stdvga use bar #0, vmware-vga bar
#1, virtio-vga bar #2.

cheers,
Gerd




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