linux-kernel - Re: [RFC PATCH] crypto: riscv: scalar accelerated GHASH

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Message-ID: <20250417165856.GB800@quark.localdomain>
Date: Thu, 17 Apr 2025 09:58:56 -0700
From: Eric Biggers <ebiggers@...nel.org>
To: Qingfang Deng <dqfext@...il.com>
Cc: Ard Biesheuvel <ardb@...nel.org>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	"David S. Miller" <davem@...emloft.net>,
	Paul Walmsley <paul.walmsley@...ive.com>,
	Palmer Dabbelt <palmer@...belt.com>,
	Albert Ou <aou@...s.berkeley.edu>, Alexandre Ghiti <alex@...ti.fr>,
	linux-crypto@...r.kernel.org, linux-riscv@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	Christoph Müllner <christoph.muellner@...ll.eu>,
	Heiko Stuebner <heiko.stuebner@...ll.eu>,
	Qingfang Deng <qingfang.deng@...lower.com.cn>
Subject: Re: [RFC PATCH] crypto: riscv: scalar accelerated GHASH

On Thu, Apr 17, 2025 at 04:42:46PM +0800, Qingfang Deng wrote:
> > I see. But do you have a particular configuration in mind? Does it
> > have scalar AES too? I looked into that a while ago but I was told
> > that nobody actually incorporates that. So what about these
> > extensions? Are they commonly implemented?
> 
> It's aes-generic.c (LUT-based) with accelerated GHASH.

That's an odd combination.  Normally accelerated AES and GHASH go together.
Presumably you're targeting some specific RISC-V CPU.  Is this going to be a
one-off thing for that specific CPU?  Or can we expect many RISC-V CPUs to have
GHASH acceleration without AES?  And if so, why?

- Eric