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From: Ian Jackson <iwj@xenproject.org>
To: Julien Grall <julien@xen.org>
Cc: Vladimir Murzin <vladimir.murzin@arm.com>,
	xen-devel@lists.xenproject.org, sstabellini@kernel.org,
	Volodymyr_Babchuk@epam.com
Subject: Re: [XEN PATCH] xen/arm: Relax GIC version check
Date: Wed, 20 Jan 2021 15:34:46 +0000	[thread overview]
Message-ID: <24584.19862.22683.273911@mariner.uk.xensource.com> (raw)
In-Reply-To: <5df5270d-216b-3f14-5416-bd3a12da3650@xen.org>

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@arm.com>
> 
> Acked-by: Julien Grall <jgrall@amazon.com>
> 
> @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@eu.citrix.com>



  reply	other threads:[~2021-01-20 15:35 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-01-20 11:26 [XEN PATCH] xen/arm: Relax GIC version check Vladimir Murzin
2021-01-20 13:49 ` Bertrand Marquis
2021-01-20 15:12 ` Julien Grall
2021-01-20 15:34   ` Ian Jackson [this message]
2021-01-20 17:44     ` Julien Grall

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