Re: [PATCH v4 05/23] arm64: Add ARM64_HAS_VIRT_HOST_EXTN feature

From: Will Deacon
Date: Mon Feb 15 2016 - 11:10:47 EST


On Thu, Feb 11, 2016 at 06:39:46PM +0000, Marc Zyngier wrote:
> Add a new ARM64_HAS_VIRT_HOST_EXTN features to indicate that the
> CPU has the ARMv8.1 VHE capability.
>
> This will be used to trigger kernel patching in KVM.
>
> Acked-by: Christoffer Dall <christoffer.dall@xxxxxxxxxx>
> Acked-by: Catalin Marinas <catalin.marinas@xxxxxxx>
> Signed-off-by: Marc Zyngier <marc.zyngier@xxxxxxx>
> ---
> arch/arm64/include/asm/cpufeature.h | 3 ++-
> arch/arm64/kernel/cpufeature.c | 11 +++++++++++
> 2 files changed, 13 insertions(+), 1 deletion(-)
>
> diff --git a/arch/arm64/include/asm/cpufeature.h b/arch/arm64/include/asm/cpufeature.h
> index 8f271b8..c705d6a 100644
> --- a/arch/arm64/include/asm/cpufeature.h
> +++ b/arch/arm64/include/asm/cpufeature.h
> @@ -30,8 +30,9 @@
> #define ARM64_HAS_LSE_ATOMICS 5
> #define ARM64_WORKAROUND_CAVIUM_23154 6
> #define ARM64_WORKAROUND_834220 7
> +#define ARM64_HAS_VIRT_HOST_EXTN 8
>
> -#define ARM64_NCAPS 8
> +#define ARM64_NCAPS 9

Just a heads up, but this conflicts with the for-next/core branch, where
I used cap 8 to identify the absence of a h/w prefetcher.

Will