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Re: [XEN PATCH] xen/arm: Relax GIC version check
- To: Vladimir Murzin <Vladimir.Murzin@xxxxxxx>
- From: Bertrand Marquis <Bertrand.Marquis@xxxxxxx>
- Date: Wed, 20 Jan 2021 13:49:17 +0000
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- Delivery-date: Wed, 20 Jan 2021 13:49:42 +0000
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- Thread-topic: [XEN PATCH] xen/arm: Relax GIC version check
Hi Vladimir,
> On 20 Jan 2021, at 11:26, Vladimir Murzin <Vladimir.Murzin@xxxxxxx> 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>
Reviewed-by: Bertrand Marquis <bertrand.marquis@xxxxxxx>
Thanks a lot
Cheers
Bertrand
> ---
> xen/include/asm-arm/cpufeature.h | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/xen/include/asm-arm/cpufeature.h
> b/xen/include/asm-arm/cpufeature.h
> index 13a2739a6..c6e5711b2 100644
> --- a/xen/include/asm-arm/cpufeature.h
> +++ b/xen/include/asm-arm/cpufeature.h
> @@ -17,7 +17,7 @@
> #define cpu_has_el3_64 (boot_cpu_feature64(el3) >= 1)
> #define cpu_has_fp (boot_cpu_feature64(fp) < 8)
> #define cpu_has_simd (boot_cpu_feature64(simd) < 8)
> -#define cpu_has_gicv3 (boot_cpu_feature64(gic) == 1)
> +#define cpu_has_gicv3 (boot_cpu_feature64(gic) >= 1)
> #endif
>
> #define cpu_feature32(c, feat) ((c)->pfr32.feat)
> --
> 2.24.0
>
>
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