linux-kernel - Re: [PATCH 1/6] x86: add kconfig symbols for assembler VAES and VPCLMULQDQ support

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Date: Tue, 26 Mar 2024 09:10:13 +0100
From: Ingo Molnar <mingo@...nel.org>
To: Eric Biggers <ebiggers@...nel.org>
Cc: linux-crypto@...r.kernel.org, x86@...nel.org,
	linux-kernel@...r.kernel.org, Ard Biesheuvel <ardb@...nel.org>,
	Andy Lutomirski <luto@...nel.org>,
	"Chang S . Bae" <chang.seok.bae@...el.com>
Subject: Re: [PATCH 1/6] x86: add kconfig symbols for assembler VAES and
 VPCLMULQDQ support


* Eric Biggers <ebiggers@...nel.org> wrote:

> From: Eric Biggers <ebiggers@...gle.com>
> 
> Add config symbols AS_VAES and AS_VPCLMULQDQ that expose whether the
> assembler supports the vector AES and carryless multiplication
> cryptographic extensions.
> 
> Signed-off-by: Eric Biggers <ebiggers@...gle.com>
> ---
>  arch/x86/Kconfig.assembler | 10 ++++++++++
>  1 file changed, 10 insertions(+)
> 
> diff --git a/arch/x86/Kconfig.assembler b/arch/x86/Kconfig.assembler
> index 8ad41da301e5..59aedf32c4ea 100644
> --- a/arch/x86/Kconfig.assembler
> +++ b/arch/x86/Kconfig.assembler
> @@ -23,9 +23,19 @@ config AS_TPAUSE
>  config AS_GFNI
>  	def_bool $(as-instr,vgf2p8mulb %xmm0$(comma)%xmm1$(comma)%xmm2)
>  	help
>  	  Supported by binutils >= 2.30 and LLVM integrated assembler
>  
> +config AS_VAES
> +	def_bool $(as-instr,vaesenc %ymm0$(comma)%ymm1$(comma)%ymm2)
> +	help
> +	  Supported by binutils >= 2.30 and LLVM integrated assembler

Nit: any reason it isn't called AS_VAESENC, like the instruction itself?

The other new AS_ Kconfig symbols follow the same nomenclature:

> +config AS_VPCLMULQDQ
> +	def_bool $(as-instr,vpclmulqdq \$0x10$(comma)%ymm0$(comma)%ymm1$(comma)%ymm2)
> +	help
> +	  Supported by binutils >= 2.30 and LLVM integrated assembler
> +
>  config AS_WRUSS
>  	def_bool $(as-instr,wrussq %rax$(comma)(%rbx))
>  	help
>  	  Supported by binutils >= 2.31 and LLVM integrated assembler

With the nit above fixed:

  Reviewed-by: Ingo Molnar <mingo@...nel.org>

Thanks,

	Ingo