Patch "crypto: x86/sha256-avx2 - add missing vzeroupper" has been added to the 6.6-stable tree

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This is a note to let you know that I've just added the patch titled

    crypto: x86/sha256-avx2 - add missing vzeroupper

to the 6.6-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-sha256-avx2-add-missing-vzeroupper.patch
and it can be found in the queue-6.6 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 6b65931059801c4d152a40e32a041d4376f1d7ce
Author: Eric Biggers <ebiggers@xxxxxxxxxx>
Date:   Fri Apr 5 20:26:09 2024 -0400

    crypto: x86/sha256-avx2 - add missing vzeroupper
    
    [ Upstream commit 57ce8a4e162599cf9adafef1f29763160a8e5564 ]
    
    Since sha256_transform_rorx() uses ymm registers, execute vzeroupper
    before returning from it.  This is necessary to avoid reducing the
    performance of SSE code.
    
    Fixes: d34a460092d8 ("crypto: sha256 - Optimized sha256 x86_64 routine using AVX2's RORX 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/sha256-avx2-asm.S b/arch/x86/crypto/sha256-avx2-asm.S
index 9918212faf914..0ffb072be9561 100644
--- a/arch/x86/crypto/sha256-avx2-asm.S
+++ b/arch/x86/crypto/sha256-avx2-asm.S
@@ -716,6 +716,7 @@ SYM_TYPED_FUNC_START(sha256_transform_rorx)
 	popq	%r13
 	popq	%r12
 	popq	%rbx
+	vzeroupper
 	RET
 SYM_FUNC_END(sha256_transform_rorx)
 




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