linux-kernel - Re: [PATCH 15/17] lib/crypto: s390/sha3: Migrate optimized code into library

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Message-ID: <b9094694cb5bc3ec0f479f3c6df909c9@linux.ibm.com>
Date: Fri, 24 Oct 2025 16:24:00 +0200
From: Harald Freudenberger <freude@...ux.ibm.com>
To: Eric Biggers <ebiggers@...nel.org>
Cc: Holger Dengler <dengler@...ux.ibm.com>,
        David Howells
 <dhowells@...hat.com>, Ard Biesheuvel <ardb@...nel.org>,
        "Jason A .
 Donenfeld" <Jason@...c4.com>, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-s390@...r.kernel.org,
        linux-crypto@...r.kernel.org
Subject: Re: [PATCH 15/17] lib/crypto: s390/sha3: Migrate optimized code into
 library

On 2025-10-21 17:49, Eric Biggers wrote:
> On Tue, Oct 21, 2025 at 10:43:00AM +0200, Holger Dengler wrote:
>> Hi Eric,
>> 
>> On 21/10/2025 09:24, Holger Dengler wrote:
>> > On 20/10/2025 19:57, Eric Biggers wrote:
>> [...]>> - Risk of bugs.  QEMU doesn't support the s390 SHA-3 
>> instructions, so no
>> >>   one except the s390 folks can test the code.  I can try to write code
>> >>   for you, but I can't test it.  And the s390 SHA-3 code has had bugs;
>> >>   see commits 992b7066800f, 68279380266a5, 73c2437109c3.
>> >>
>> >>   The first priority should be correctness.
>> >
>> > Let me figure out, if me and my colleagues can do the testing for you.
>> > Unfortunately, I'll be unavailable for the next two weeks. But I'll come back
>> > with a solution for the testing.
>> 
>> I talked to Harald: we can do the testing for you on our development 
>> machines.
>> Please send new series to us or provide them in your git repo.
> 
> Thanks!  I'll Cc both of you on v2 when I send it later.  For now, this
> series (v1) can be found in lore at
> https://lore.kernel.org/linux-crypto/20251020005038.661542-1-ebiggers@kernel.org/T/#u
> And as mentioned in the cover letter it's also retrievable from git:
> 
>     git fetch
> https://git.kernel.org/pub/scm/linux/kernel/git/ebiggers/linux.git
> sha3-lib-v1
> 
> v1 already has the s390 optimized implementations of
> sha3_absorb_blocks() and sha3_keccakf().  If you could enable the
> following:
> 
>     CONFIG_CRYPTO_LIB_SHA3_KUNIT_TEST=y
>     CONFIG_CRYPTO_LIB_BENCHMARK=y
> 
> ... and then show the results for sha3_kunit before and after the 
> commit
> "lib/crypto: s390/sha3: Migrate optimized code into library", that 
> would
> be helpful.
> 
> In v2, I'll look into providing overrides for the one-shot functions
> sha3_{224,256,384,512}() too.  If it works out, I'll ask you to re-test
> with that additional change as well.
> 
> - Eric

I pulled your repository and checked out the branch sha3-lib-v1 and
while the kernel build runs I get link errors:

ld: crypto/sha3.o: in function `crypto_sha3_512_digest':
/root/ebiggers-linux/crypto/sha3.c:80:(.text+0xaa): undefined reference 
to `sha3_512'
ld: crypto/sha3.o: in function `crypto_sha3_384_digest':
/root/ebiggers-linux/crypto/sha3.c:73:(.text+0xea): undefined reference 
to `sha3_384'
ld: crypto/sha3.o: in function `crypto_sha3_256_digest':
/root/ebiggers-linux/crypto/sha3.c:66:(.text+0x12a): undefined reference 
to `sha3_256'
ld: crypto/sha3.o: in function `crypto_sha3_224_digest':
/root/ebiggers-linux/crypto/sha3.c:59:(.text+0x1aa): undefined reference 
to `sha3_224'
ld: crypto/sha3.o: in function `sha3_final':
/root/ebiggers-linux/./include/crypto/sha3.h:188:(.text+0x1f0): 
undefined reference to `__sha3_squeeze'
ld: crypto/sha3.o: in function `sha3_update':
/root/ebiggers-linux/./include/crypto/sha3.h:172:(.text+0x232): 
undefined reference to `__sha3_update'

with a s390 defconfig kernel configuration an a s390 debug_defconfig 
kernel configuration.