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



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



 


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