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

[Eric Biggers]

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