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 ef73a3ab87263e4637e5fcbbe92a11632c83fe42..791386d9a83aa16e7911df277b6a30310d64a0b6 100644 (file)
--- 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)