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

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Message-ID: <20231206074155.GA43833@sol.localdomain>
Date:   Tue, 5 Dec 2023 23:41:55 -0800
From:   Eric Biggers <ebiggers@...nel.org>
To:     Jerry Shih <jerry.shih@...ive.com>,
        Andy Chiu <andy.chiu@...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, conor.dooley@...rochip.com, ardb@...nel.org,
        conor@...nel.org, heiko@...ech.de, 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 v3 00/12] RISC-V: provide some accelerated cryptography
 implementations using vector extensions

Hi Jerry,

On Wed, Dec 06, 2023 at 03:02:40PM +0800, Jerry Shih wrote:
> On Dec 6, 2023, at 08:46, Eric Biggers <ebiggers@...nel.org> wrote:
> > On Tue, Dec 05, 2023 at 05:27:49PM +0800, Jerry Shih wrote:
> >> This series depend on:
> >> 2. support kernel-mode vector
> >> Link: https://lore.kernel.org/all/20230721112855.1006-1-andy.chiu@sifive.com/
> >> 3. vector crypto extensions detection
> >> Link: https://lore.kernel.org/lkml/20231017131456.2053396-1-cleger@rivosinc.com/
> > 
> > What's the status of getting these prerequisites merged?
> > 
> > - Eric
> 
> The latest extension detection patch version is v5.
> Link: https://lore.kernel.org/lkml/20231114141256.126749-1-cleger@rivosinc.com/
> It's still under reviewing.
> But I think the checking codes used in this crypto patch series will not change.
> We could just wait and rebase when it's merged.
> 
> The latest kernel-mode vector patch version is v3.
> Link: https://lore.kernel.org/all/20231019154552.23351-1-andy.chiu@sifive.com/
> This patch doesn't work with qemu(hit kernel panic when using vector). It's not
> clear for the status. Could we still do the reviewing process for the gluing code and
> the crypto asm parts?

I'm almost ready to give my Reviewed-by for this whole series.  The problem is
that it can't be merged until its prerequisites are merged.

Andy Chiu's last patchset "riscv: support kernel-mode Vector" was 2 months ago,
but he also gave a talk at Plumbers about it more recently
(https://www.youtube.com/watch?v=eht3PccEn5o).  So I assume he's still working
on it.  It sounds like he's also going to include support for preemption, and
optimizations to memcpy, memset, memmove, and copy_{to,from}_user.

I think it would be a good idea to split out the basic support for
kernel_vector_{begin,end} so that the users of them, as well as the preemption
support, can be considered and merged separately.  Maybe patch 1 of the series
(https://lore.kernel.org/r/20231019154552.23351-2-andy.chiu@sifive.com) is all
that's needed initially?

Andy, what do you think?

- Eric