From 36c70bee14056418dee30b76b0f49720d5cb1ccd Mon Sep 17 00:00:00 2001
From: Eric Biggers <ebiggers@google.com>
Date: Fri, 5 Apr 2024 20:26:08 -0400
Subject: [PATCH] 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>
---
 arch/x86/crypto/nh-avx2-x86_64.S | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/x86/crypto/nh-avx2-x86_64.S b/arch/x86/crypto/nh-avx2-x86_64.S
index 6a0b15e71..54c0ee412 100755
--- 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)