Re: [Xen-devel] [PATCH v2] arm/gic-v3: Fix ACPI probe fail on GICv4 hardware

[Julien Grall <julien.grall@xxxxxxx>]

Hello Shanker,

On 27/05/16 16:00, Shanker Donthineni wrote:
> The current driver ACPI probe fails on hardware which has GICv4
> version, even though it is fully compatible to GICv3. This patch
> fixes the issue by registering the same probe function for GICv4
> hardware.
>
> Signed-off-by: Shanker Donthineni <shankerd@xxxxxxxxxxxxxx>
> ---
> Changes since v1:
>     - Edit commit text.
>     - Fix BUG() in xen/arch/arm/domain.c
Please see my latest comment on the previous version [1].

To go further, the ACPI tables may not represent the actual hardware. It 
is possible to have ACPI tables describing a GICv2 whilst the real 
hardware is a GICv3.
Xen will use the GICv2 driver and not the GICv3. So the helper will 
return GIC_V2 (and not GIC_V3).
Regards,

[1] https://www.mail-archive.com/xen-devel@xxxxxxxxxxxxx/msg69273.html

--
Julien Grall

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