Re: [XEN PATCH] xen/arm: Relax GIC version check

[Julien Grall <julien@xxxxxxx>]

Hi Ian,

On 20/01/2021 15:34, Ian Jackson wrote:
> Julien Grall writes ("Re: [XEN PATCH] xen/arm: Relax GIC version check"):
> > On 20/01/2021 11:26, Vladimir Murzin wrote:
> > > Supported values are
> > >
> > > 0b0000 GIC CPU interface system registers not implemented.
> > >
> > > 0b0001 System register interface to versions 3.0 and 4.0 of the GIC
> > >          CPU interface is supported.
> > >
> > > 0b0011 System register interface to version 4.1 of the GIC CPU
> > >          interface is supported.
> > >
> > > 4.1 is still backward compatible with 4.0/3.0, moreover ARM ARM
> > > guarantees that future versions of the GIC CPU interface retain
> > > backwards compatible.
> > >
> > > Signed-off-by: Vladimir Murzin <vladimir.murzin@xxxxxxx>
> > Acked-by: Julien Grall <jgrall@xxxxxxxxxx>
> >
> > @Ian: I would like your put as the RM for 4.15.
> >
> > Technically, it could be consider as a new "feature" because Xen would
> > fail to boot on such HW.
> >
> > However, I think the change is small enough and doesn't introduce risk
> > on existing supported HW.
> >
> > Therefore, I would like to merge it for 4.15. @Ian does it sounds good
> > to you?
> Thank you for this analysis.  I think it does need a freeze
> exception.  But your argument is convincing, so
>
> Release-Acked-by: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
Thank you!

I have committed the patch.

Cheers,

--
Julien Grall