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

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Message-ID: <ZgKHFY/XaN2di1zy@gmail.com>
Date: Tue, 26 Mar 2024 09:28:05 +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:

> On Tue, Mar 26, 2024 at 09:10:13AM +0100, Ingo Molnar wrote:
> > 
> > * 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:
> 
> The CPU feature flag is called VAES.  It guards the vaesenc, vaesenclast,
> vaesdec, and vaesdeclast instructions when used on ymm and zmm registers.

I see - fair enough:

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

Thanks,

	Ingo