Re: [PATCH] xen/pt: fix igd passthrough for pc machine with xen accelerator

[Stefano Stabellini]

On Wed, 17 May 2023, Michael Tokarev wrote:
> 17.05.2023 12:47, Chuck Zmudzinski wrote:
> > On 5/17/2023 2:39 AM, Michael Tokarev wrote:
> > > 08.02.2023 05:03, Chuck Zmudzinski wrote:...
> > > > Fixes: 998250e97661 ("xen, gfx passthrough: register host bridge
> > > > specific to passthrough")
> > > > Signed-off-by: Chuck Zmudzinski <brchuckz@aol.com>
> > > 
> > > Has this change been forgotten?  Is it not needed anymore?
> > 
> > Short answer:
> > 
> > After 4f67543b ("xen/pt: reserve PCI slot 2 for Intel igd-passthru ") was
> > applied, I was inclined to think this change is not needed anymore, but
> > it would not hurt to add this change also, and now I think it might be
> > more correct to also add this change.
> ...
> 
> Well, there were two machines with broken IDG passthrough in xen, now
> there's one machine with broken IDG passthrough. Let's fix them all :)
> Note this patch is tagged -stable as well.
> 
> > If you want to add this change also, let's make sure recent changes to the
> > xen header files do not require the patch to be rebased before committing
> > it.
> 
> It doesn't require rebasing, it looks like, - just built 8.0 and current
> master
> qemu with it applied.  I haven't tried the actual IDG passthrough, though.
> 
> It just neeeds to be picked up the usual way as all other qemu changes goes
> in.

Hi Michal,

I am OK with this patch and acked it. However, I think it also needs an
ack from one if the i386 maintainers, Michal T or Marcel.