This is a note to let you know that I've just added the patch titled
crypto: x86/sha512-avx2 - add missing vzeroupper
to the 6.8-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
crypto-x86-sha512-avx2-add-missing-vzeroupper.patch
and it can be found in the queue-6.8 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 7924c8d0221de2bab55826c27abea59814ed866f
Author: Eric Biggers <ebiggers@xxxxxxxxxx>
Date: Fri Apr 5 20:26:10 2024 -0400
crypto: x86/sha512-avx2 - add missing vzeroupper
[ Upstream commit 6a24fdfe1edbafacdacd53516654d99068f20eec ]
Since sha512_transform_rorx() uses ymm registers, execute vzeroupper
before returning from it. This is necessary to avoid reducing the
performance of SSE code.
Fixes: e01d69cb0195 ("crypto: sha512 - Optimized SHA512 x86_64 assembly routine using AVX instructions.")
Signed-off-by: Eric Biggers <ebiggers@xxxxxxxxxx>
Acked-by: Tim Chen <tim.c.chen@xxxxxxxxxxxxxxx>
Signed-off-by: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/arch/x86/crypto/sha512-avx2-asm.S b/arch/x86/crypto/sha512-avx2-asm.S
index f08496cd68708..24973f42c43ff 100644
--- a/arch/x86/crypto/sha512-avx2-asm.S
+++ b/arch/x86/crypto/sha512-avx2-asm.S
@@ -680,6 +680,7 @@ SYM_TYPED_FUNC_START(sha512_transform_rorx)
pop %r12
pop %rbx
+ vzeroupper
RET
SYM_FUNC_END(sha512_transform_rorx)
