linux-kernel - Re: [PATCH 12/12] RISC-V: crypto: add Zvkb accelerated ChaCha20 implementation

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Message-ID: <20231120191856.GA964@sol.localdomain>
Date:   Mon, 20 Nov 2023 11:18:56 -0800
From:   Eric Biggers <ebiggers@...nel.org>
To:     Jerry Shih <jerry.shih@...ive.com>
Cc:     Paul Walmsley <paul.walmsley@...ive.com>, palmer@...belt.com,
        Albert Ou <aou@...s.berkeley.edu>, herbert@...dor.apana.org.au,
        davem@...emloft.net, andy.chiu@...ive.com, greentime.hu@...ive.com,
        conor.dooley@...rochip.com, guoren@...nel.org, bjorn@...osinc.com,
        heiko@...ech.de, ardb@...nel.org, phoebe.chen@...ive.com,
        hongrong.hsu@...ive.com, linux-riscv@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-crypto@...r.kernel.org
Subject: Re: [PATCH 12/12] RISC-V: crypto: add Zvkb accelerated ChaCha20
 implementation

Hi Jerry!

On Mon, Nov 20, 2023 at 10:55:15AM +0800, Jerry Shih wrote:
> >> +# - RV64I
> >> +# - RISC-V Vector ('V') with VLEN >= 128
> >> +# - RISC-V Vector Cryptography Bit-manipulation extension ('Zvkb')
> >> +# - RISC-V Zicclsm(Main memory supports misaligned loads/stores)
> > 
> > How is the presence of the Zicclsm extension guaranteed?
> > 
> > - Eric
> 
> I have the addition extension parser for `Zicclsm` in the v2 patch set.

First, I can see your updated patchset at branch
"dev/jerrys/vector-crypto-upstream-v2" of https://github.com/JerryShih/linux,
but I haven't seen it on the mailing list yet.  Are you planning to send it out?

Second, with your updated patchset, I'm not seeing any of the RISC-V optimized
algorithms be registered when I boot the kernel in QEMU.  This is caused by the
new check 'riscv_isa_extension_available(NULL, ZICCLSM)' not passing.  Is
checking for "Zicclsm" the correct way to determine whether unaligned memory
accesses are supported?

I'm using 'qemu-system-riscv64 -cpu max -machine virt', with the very latest
QEMU commit (af9264da80073435), so it should have all the CPU features.

- Eric