Re: [Qemu-devel] [RFC][PATCH 1/1] libxl: add one machine property to support IGD GFX passthrough

[Chen, Tiejun]

On 2015/1/21 21:48, Gerd Hoffmann wrote:
> On Mi, 2015-01-21 at 11:37 +0000, Ian Jackson wrote:
> > Tiejun Chen writes ("[RFC][PATCH 1/1] libxl: add one machine property to support IGD 
> > GFX passthrough"):
> > > When we're working to support IGD GFX passthrough with qemu
> > > upstream, instead of "-gfx_passthru" we'd like to make that
> > > a machine option, "-machine xxx,gfx_passthru=on". This need
> > > to bring several changes on tool side.
> >
> > Has the corresponding patch to qemu-upstream been accepted yet ?
> >
> > I'd like to see a confirmation from the qemu side that this is going
> > into their tree and that the command-line option syntax has been
> > agreed.
>
> Suggested at patch review, not merged (guess thats why it is tagged
> 'rfc', to get both qemu+xen on the same page).

Yeah, this is exactly what I intended to do here :)

> While being at it:  Should we name this 'igd-passthru' instead of
> 'gfx-passthru'?  The hostbridge / isabridge quirks needed are actually
> specific to igd and are not needed for -- say -- nvidia gfx cards.

At this point I just concern here if we still use 'gfx_passthrou', at 
least it may look like a backward compatibility with older versions of 
qemu in Xen side, qemu-xen-traditional. But I'd like to follow your 
final option.

Thanks
Tiejun