[PATCH v3 00/12] RISC-V: provide some accelerated cryptography implementations using vector extensions

[Eric Biggers]

Hi Jerry,

On Tue, Dec 05, 2023 at 05:27:49PM +0800, Jerry Shih wrote:
> Changelog v2:
>  - Turn to use simd skcipher interface for AES-CBC/CTR/ECB/XTS and
>    Chacha20.

If I understand correctly, the RISC-V kernel-mode vector support now seems to be
heading down the path of supporting softirq context, as I had suggested
originally.  With patches 1-2 of Andy Chiu's latest patchset
"[v7, 00/10] riscv: support kernel-mode Vector"
(https://lore.kernel.org/linux-riscv/20231221134318.28105-1-andy.chiu@sifive.com).
applied, the kernel has basic support for kernel-mode vector, including in
softirq context.

With that being the case, "skcipher" algorithms can just use the RISC-V vector
unit unconditionally, given that skcipher only supports task and softirq
context.  Therefore, can you consider undoing your change that added fallbacks
using the simd helper (crypto/simd.c)?  Thanks!

- Eric