From: Eric Biggers <ebiggers@google.com>
Date: Sat, 6 Apr 2024 00:26:08 +0000 (-0400)
Subject: crypto: x86/nh-avx2 - add missing vzeroupper
X-Git-Tag: v5.10.219~273
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=0ceb0a40c5ecc563764128f67bfceea3fb7d3ada;p=thirdparty%2Fkernel%2Fstable.git

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@google.com>
Acked-by: Tim Chen <tim.c.chen@linux.intel.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---

diff --git a/arch/x86/crypto/nh-avx2-x86_64.S b/arch/x86/crypto/nh-avx2-x86_64.S
index 6a0b15e7196a8..54c0ee41209d5 100644
--- a/arch/x86/crypto/nh-avx2-x86_64.S
+++ b/arch/x86/crypto/nh-avx2-x86_64.S
@@ -153,5 +153,6 @@ SYM_FUNC_START(nh_avx2)
 	vpaddq		T1, T0, T0
 	vpaddq		T4, T0, T0
 	vmovdqu		T0, (HASH)
+	vzeroupper
 	RET
 SYM_FUNC_END(nh_avx2)