linux-kernel - Re: [PATCH v4 00/12] RISC-V: support some cryptography accelerations

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Message-Id: <AB98E114-A8DE-492E-B078-7394EE4FA83E@sifive.com>
Date:   Tue, 31 Oct 2023 10:17:11 +0800
From:   Jerry Shih <jerry.shih@...ive.com>
To:     Eric Biggers <ebiggers@...nel.org>
Cc:     Charlie Jenkins <charlie@...osinc.com>,
        Heiko Stuebner <heiko@...ech.de>, palmer@...belt.com,
        paul.walmsley@...ive.com, aou@...s.berkeley.edu,
        herbert@...dor.apana.org.au, davem@...emloft.net,
        conor.dooley@...rochip.com, linux-riscv@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-crypto@...r.kernel.org,
        christoph.muellner@...ll.eu,
        Heiko Stuebner <heiko.stuebner@...ll.eu>
Subject: Re: [PATCH v4 00/12] RISC-V: support some cryptography accelerations

On Oct 7, 2023, at 03:47, Eric Biggers <ebiggers@...nel.org> wrote:
> On Fri, Sep 15, 2023 at 11:21:28AM +0800, Jerry Shih wrote:
>> On Sep 15, 2023, at 09:48, He-Jie Shih <bignose1007@...il.com> wrote:
>> 
>> The OpenSSL PR is at [1].
>> And we are from SiFive.
>> 
>> -Jerry
>> 
>> [1]
>> https://github.com/openssl/openssl/pull/21923
> 
> Hi Jerry, I'm wondering if you have an update on this?  Do you need any help?

The RISC-V vector crypto OpenSSL pr[1] is merged.
And we also sent the vector-crypto patch based on Heiko's and OpenSSL
works.
Here is the link:
https://lore.kernel.org/all/20231025183644.8735-1-jerry.shih@sifive.com/

[1]
https://github.com/openssl/openssl/pull/21923

> I'm also wondering about riscv.pm and the choice of generating the crypto
> instructions from .words instead of using the assembler.  It makes it
> significantly harder to review the code, IMO.  Can we depend on assembler
> support for these instructions, or is that just not ready yet?
> 
> - Eric

There is no public assembler supports the vector-crypto asm mnemonics.
We should still use `opcode` for vector-crypto instructions. But we might
use asm for standard rvv parts.
In order to reuse the codes in OpenSSL as much as possible,  we still use
the `riscv.pm` for all standard rvv and vector-crypto instructions. If the asm
mnemonic is still a better approach,  I will `rewrite` all standard rvv parts
with asm mnemonics in next patch.

-Jerry