This is a note to let you know that I've just added the patch titled
crypto: x86/nh-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-nh-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 b2bfa84c34c5826d6c83e96d271de7594847b17e
Author: Eric Biggers <ebiggers@xxxxxxxxxx>
Date: Fri Apr 5 20:26:08 2024 -0400
crypto: x86/nh-avx2 - add missing vzeroupper
[ Upstream commit 4ad096cca942959871d8ff73826d30f81f856f6e ]
Since nh_avx2() uses ymm registers, execute vzeroupper before returning
from it. This is necessary to avoid reducing the performance of SSE
code.
Fixes: 0f961f9f670e ("crypto: x86/nhpoly1305 - add AVX2 accelerated NHPoly1305")
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/nh-avx2-x86_64.S b/arch/x86/crypto/nh-avx2-x86_64.S
index ef73a3ab87263..791386d9a83aa 100644
--- a/arch/x86/crypto/nh-avx2-x86_64.S
+++ b/arch/x86/crypto/nh-avx2-x86_64.S
@@ -154,5 +154,6 @@ SYM_TYPED_FUNC_START(nh_avx2)
vpaddq T1, T0, T0
vpaddq T4, T0, T0
vmovdqu T0, (HASH)
+ vzeroupper
RET
SYM_FUNC_END(nh_avx2)
