[PATCH 3/8] crypto: x86 - Stop using cpu_has_xfeatures()
From: Eric Biggers
Date: Fri Jun 26 2026 - 00:40:38 EST
Checking both boot_cpu_has(X86_FEATURE_AVX*) and cpu_has_xfeatures() has
never really been needed in practice, and it's never been universally
done (e.g., lib/raid/ omits cpu_has_xfeatures()). Nevertheless, both
x86 and UML now explicitly clear the AVX and AVX-512 flags if their
xfeatures are missing, which should remove any remaining doubts.
Thus, remove all the calls to cpu_has_xfeatures(), as well as the
related checks of boot_cpu_has(X86_FEATURE_OSXSAVE).
In a few cases there was no corresponding boot_cpu_has(X86_FEATURE_AVX*)
check, so add the missing ones.
Signed-off-by: Eric Biggers <ebiggers@xxxxxxxxxx>
---
arch/x86/crypto/aegis128-aesni-glue.c | 3 +--
arch/x86/crypto/aesni-intel_glue.c | 7 ++-----
arch/x86/crypto/aria_aesni_avx2_glue.c | 11 +----------
arch/x86/crypto/aria_aesni_avx_glue.c | 11 +----------
arch/x86/crypto/aria_gfni_avx512_glue.c | 11 +----------
arch/x86/crypto/camellia_aesni_avx2_glue.c | 11 +----------
arch/x86/crypto/camellia_aesni_avx_glue.c | 11 +----------
arch/x86/crypto/cast5_avx_glue.c | 7 ++-----
arch/x86/crypto/cast6_avx_glue.c | 7 ++-----
arch/x86/crypto/serpent_avx2_glue.c | 9 +--------
arch/x86/crypto/serpent_avx_glue.c | 7 ++-----
arch/x86/crypto/sm4_aesni_avx2_glue.c | 11 +----------
arch/x86/crypto/sm4_aesni_avx_glue.c | 11 +----------
arch/x86/crypto/twofish_avx_glue.c | 6 ++----
14 files changed, 19 insertions(+), 104 deletions(-)
diff --git a/arch/x86/crypto/aegis128-aesni-glue.c b/arch/x86/crypto/aegis128-aesni-glue.c
index f1adfba1a76e..09fc0b15b0e9 100644
--- a/arch/x86/crypto/aegis128-aesni-glue.c
+++ b/arch/x86/crypto/aegis128-aesni-glue.c
@@ -263,12 +263,11 @@ static struct aead_alg crypto_aegis128_aesni_alg = {
};
static int __init crypto_aegis128_aesni_module_init(void)
{
if (!boot_cpu_has(X86_FEATURE_XMM4_1) ||
- !boot_cpu_has(X86_FEATURE_AES) ||
- !cpu_has_xfeatures(XFEATURE_MASK_SSE, NULL))
+ !boot_cpu_has(X86_FEATURE_AES))
return -ENODEV;
return crypto_register_aead(&crypto_aegis128_aesni_alg);
}
diff --git a/arch/x86/crypto/aesni-intel_glue.c b/arch/x86/crypto/aesni-intel_glue.c
index f522fff9231e..f6f899db7482 100644
--- a/arch/x86/crypto/aesni-intel_glue.c
+++ b/arch/x86/crypto/aesni-intel_glue.c
@@ -1546,12 +1546,11 @@ static int __init register_avx_algs(void)
* For simplicity, just always check for VAES and VPCLMULQDQ together.
*/
if (!boot_cpu_has(X86_FEATURE_AVX2) ||
!boot_cpu_has(X86_FEATURE_VAES) ||
!boot_cpu_has(X86_FEATURE_VPCLMULQDQ) ||
- !boot_cpu_has(X86_FEATURE_PCLMULQDQ) ||
- !cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM, NULL))
+ !boot_cpu_has(X86_FEATURE_PCLMULQDQ))
return 0;
err = crypto_register_skciphers(skcipher_algs_vaes_avx2,
ARRAY_SIZE(skcipher_algs_vaes_avx2));
if (err)
return err;
@@ -1560,13 +1559,11 @@ static int __init register_avx_algs(void)
if (err)
return err;
if (!boot_cpu_has(X86_FEATURE_AVX512BW) ||
!boot_cpu_has(X86_FEATURE_AVX512VL) ||
- !boot_cpu_has(X86_FEATURE_BMI2) ||
- !cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM |
- XFEATURE_MASK_AVX512, NULL))
+ !boot_cpu_has(X86_FEATURE_BMI2))
return 0;
if (boot_cpu_has(X86_FEATURE_PREFER_YMM)) {
int i;
diff --git a/arch/x86/crypto/aria_aesni_avx2_glue.c b/arch/x86/crypto/aria_aesni_avx2_glue.c
index 1487a49bfbac..371be2fb6469 100644
--- a/arch/x86/crypto/aria_aesni_avx2_glue.c
+++ b/arch/x86/crypto/aria_aesni_avx2_glue.c
@@ -193,26 +193,17 @@ static struct skcipher_alg aria_algs[] = {
}
};
static int __init aria_avx2_init(void)
{
- const char *feature_name;
-
if (!boot_cpu_has(X86_FEATURE_AVX) ||
!boot_cpu_has(X86_FEATURE_AVX2) ||
- !boot_cpu_has(X86_FEATURE_AES) ||
- !boot_cpu_has(X86_FEATURE_OSXSAVE)) {
+ !boot_cpu_has(X86_FEATURE_AES)) {
pr_info("AVX2 or AES-NI instructions are not detected.\n");
return -ENODEV;
}
- if (!cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM,
- &feature_name)) {
- pr_info("CPU feature '%s' is not supported.\n", feature_name);
- return -ENODEV;
- }
-
if (boot_cpu_has(X86_FEATURE_GFNI)) {
aria_ops.aria_encrypt_16way = aria_aesni_avx_gfni_encrypt_16way;
aria_ops.aria_decrypt_16way = aria_aesni_avx_gfni_decrypt_16way;
aria_ops.aria_ctr_crypt_16way = aria_aesni_avx_gfni_ctr_crypt_16way;
aria_ops.aria_encrypt_32way = aria_aesni_avx2_gfni_encrypt_32way;
diff --git a/arch/x86/crypto/aria_aesni_avx_glue.c b/arch/x86/crypto/aria_aesni_avx_glue.c
index e4e3d78915a5..d23fc91c0ebd 100644
--- a/arch/x86/crypto/aria_aesni_avx_glue.c
+++ b/arch/x86/crypto/aria_aesni_avx_glue.c
@@ -180,25 +180,16 @@ static struct skcipher_alg aria_algs[] = {
}
};
static int __init aria_avx_init(void)
{
- const char *feature_name;
-
if (!boot_cpu_has(X86_FEATURE_AVX) ||
- !boot_cpu_has(X86_FEATURE_AES) ||
- !boot_cpu_has(X86_FEATURE_OSXSAVE)) {
+ !boot_cpu_has(X86_FEATURE_AES)) {
pr_info("AVX or AES-NI instructions are not detected.\n");
return -ENODEV;
}
- if (!cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM,
- &feature_name)) {
- pr_info("CPU feature '%s' is not supported.\n", feature_name);
- return -ENODEV;
- }
-
if (boot_cpu_has(X86_FEATURE_GFNI)) {
aria_ops.aria_encrypt_16way = aria_aesni_avx_gfni_encrypt_16way;
aria_ops.aria_decrypt_16way = aria_aesni_avx_gfni_decrypt_16way;
aria_ops.aria_ctr_crypt_16way = aria_aesni_avx_gfni_ctr_crypt_16way;
} else {
diff --git a/arch/x86/crypto/aria_gfni_avx512_glue.c b/arch/x86/crypto/aria_gfni_avx512_glue.c
index 363cbf4399cc..e05bbeb22d4a 100644
--- a/arch/x86/crypto/aria_gfni_avx512_glue.c
+++ b/arch/x86/crypto/aria_gfni_avx512_glue.c
@@ -194,28 +194,19 @@ static struct skcipher_alg aria_algs[] = {
}
};
static int __init aria_avx512_init(void)
{
- const char *feature_name;
-
if (!boot_cpu_has(X86_FEATURE_AVX) ||
!boot_cpu_has(X86_FEATURE_AVX2) ||
!boot_cpu_has(X86_FEATURE_AVX512F) ||
!boot_cpu_has(X86_FEATURE_AVX512VL) ||
- !boot_cpu_has(X86_FEATURE_GFNI) ||
- !boot_cpu_has(X86_FEATURE_OSXSAVE)) {
+ !boot_cpu_has(X86_FEATURE_GFNI)) {
pr_info("AVX512/GFNI instructions are not detected.\n");
return -ENODEV;
}
- if (!cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM |
- XFEATURE_MASK_AVX512, &feature_name)) {
- pr_info("CPU feature '%s' is not supported.\n", feature_name);
- return -ENODEV;
- }
-
aria_ops.aria_encrypt_16way = aria_aesni_avx_gfni_encrypt_16way;
aria_ops.aria_decrypt_16way = aria_aesni_avx_gfni_decrypt_16way;
aria_ops.aria_ctr_crypt_16way = aria_aesni_avx_gfni_ctr_crypt_16way;
aria_ops.aria_encrypt_32way = aria_aesni_avx2_gfni_encrypt_32way;
aria_ops.aria_decrypt_32way = aria_aesni_avx2_gfni_decrypt_32way;
diff --git a/arch/x86/crypto/camellia_aesni_avx2_glue.c b/arch/x86/crypto/camellia_aesni_avx2_glue.c
index 2d2f4e16537c..073fa3bb8388 100644
--- a/arch/x86/crypto/camellia_aesni_avx2_glue.c
+++ b/arch/x86/crypto/camellia_aesni_avx2_glue.c
@@ -95,26 +95,17 @@ static struct skcipher_alg camellia_algs[] = {
},
};
static int __init camellia_aesni_init(void)
{
- const char *feature_name;
-
if (!boot_cpu_has(X86_FEATURE_AVX) ||
!boot_cpu_has(X86_FEATURE_AVX2) ||
- !boot_cpu_has(X86_FEATURE_AES) ||
- !boot_cpu_has(X86_FEATURE_OSXSAVE)) {
+ !boot_cpu_has(X86_FEATURE_AES)) {
pr_info("AVX2 or AES-NI instructions are not detected.\n");
return -ENODEV;
}
- if (!cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM,
- &feature_name)) {
- pr_info("CPU feature '%s' is not supported.\n", feature_name);
- return -ENODEV;
- }
-
return crypto_register_skciphers(camellia_algs,
ARRAY_SIZE(camellia_algs));
}
static void __exit camellia_aesni_fini(void)
diff --git a/arch/x86/crypto/camellia_aesni_avx_glue.c b/arch/x86/crypto/camellia_aesni_avx_glue.c
index 5c321f255eb7..872e5e07220f 100644
--- a/arch/x86/crypto/camellia_aesni_avx_glue.c
+++ b/arch/x86/crypto/camellia_aesni_avx_glue.c
@@ -96,25 +96,16 @@ static struct skcipher_alg camellia_algs[] = {
}
};
static int __init camellia_aesni_init(void)
{
- const char *feature_name;
-
if (!boot_cpu_has(X86_FEATURE_AVX) ||
- !boot_cpu_has(X86_FEATURE_AES) ||
- !boot_cpu_has(X86_FEATURE_OSXSAVE)) {
+ !boot_cpu_has(X86_FEATURE_AES)) {
pr_info("AVX or AES-NI instructions are not detected.\n");
return -ENODEV;
}
- if (!cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM,
- &feature_name)) {
- pr_info("CPU feature '%s' is not supported.\n", feature_name);
- return -ENODEV;
- }
-
return crypto_register_skciphers(camellia_algs,
ARRAY_SIZE(camellia_algs));
}
static void __exit camellia_aesni_fini(void)
diff --git a/arch/x86/crypto/cast5_avx_glue.c b/arch/x86/crypto/cast5_avx_glue.c
index 3aca04d43b34..5de35e863370 100644
--- a/arch/x86/crypto/cast5_avx_glue.c
+++ b/arch/x86/crypto/cast5_avx_glue.c
@@ -90,15 +90,12 @@ static struct skcipher_alg cast5_algs[] = {
}
};
static int __init cast5_init(void)
{
- const char *feature_name;
-
- if (!cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM,
- &feature_name)) {
- pr_info("CPU feature '%s' is not supported.\n", feature_name);
+ if (!boot_cpu_has(X86_FEATURE_AVX)) {
+ pr_info("AVX instructions are not detected.\n");
return -ENODEV;
}
return crypto_register_skciphers(cast5_algs,
ARRAY_SIZE(cast5_algs));
diff --git a/arch/x86/crypto/cast6_avx_glue.c b/arch/x86/crypto/cast6_avx_glue.c
index c4dd28c30303..3d7ea48007bc 100644
--- a/arch/x86/crypto/cast6_avx_glue.c
+++ b/arch/x86/crypto/cast6_avx_glue.c
@@ -90,15 +90,12 @@ static struct skcipher_alg cast6_algs[] = {
},
};
static int __init cast6_init(void)
{
- const char *feature_name;
-
- if (!cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM,
- &feature_name)) {
- pr_info("CPU feature '%s' is not supported.\n", feature_name);
+ if (!boot_cpu_has(X86_FEATURE_AVX)) {
+ pr_info("AVX instructions are not detected.\n");
return -ENODEV;
}
return crypto_register_skciphers(cast6_algs, ARRAY_SIZE(cast6_algs));
}
diff --git a/arch/x86/crypto/serpent_avx2_glue.c b/arch/x86/crypto/serpent_avx2_glue.c
index f5f2121b7956..72a9e2b306d6 100644
--- a/arch/x86/crypto/serpent_avx2_glue.c
+++ b/arch/x86/crypto/serpent_avx2_glue.c
@@ -91,21 +91,14 @@ static struct skcipher_alg serpent_algs[] = {
},
};
static int __init serpent_avx2_init(void)
{
- const char *feature_name;
-
- if (!boot_cpu_has(X86_FEATURE_AVX2) || !boot_cpu_has(X86_FEATURE_OSXSAVE)) {
+ if (!boot_cpu_has(X86_FEATURE_AVX2)) {
pr_info("AVX2 instructions are not detected.\n");
return -ENODEV;
}
- if (!cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM,
- &feature_name)) {
- pr_info("CPU feature '%s' is not supported.\n", feature_name);
- return -ENODEV;
- }
return crypto_register_skciphers(serpent_algs,
ARRAY_SIZE(serpent_algs));
}
diff --git a/arch/x86/crypto/serpent_avx_glue.c b/arch/x86/crypto/serpent_avx_glue.c
index 9c8b3a335d5c..42c4e1569674 100644
--- a/arch/x86/crypto/serpent_avx_glue.c
+++ b/arch/x86/crypto/serpent_avx_glue.c
@@ -98,15 +98,12 @@ static struct skcipher_alg serpent_algs[] = {
},
};
static int __init serpent_init(void)
{
- const char *feature_name;
-
- if (!cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM,
- &feature_name)) {
- pr_info("CPU feature '%s' is not supported.\n", feature_name);
+ if (!boot_cpu_has(X86_FEATURE_AVX)) {
+ pr_info("AVX instructions are not detected.\n");
return -ENODEV;
}
return crypto_register_skciphers(serpent_algs,
ARRAY_SIZE(serpent_algs));
diff --git a/arch/x86/crypto/sm4_aesni_avx2_glue.c b/arch/x86/crypto/sm4_aesni_avx2_glue.c
index fec0ab7a63dd..eef73894e777 100644
--- a/arch/x86/crypto/sm4_aesni_avx2_glue.c
+++ b/arch/x86/crypto/sm4_aesni_avx2_glue.c
@@ -96,26 +96,17 @@ static struct skcipher_alg sm4_aesni_avx2_skciphers[] = {
}
};
static int __init sm4_init(void)
{
- const char *feature_name;
-
if (!boot_cpu_has(X86_FEATURE_AVX) ||
!boot_cpu_has(X86_FEATURE_AVX2) ||
- !boot_cpu_has(X86_FEATURE_AES) ||
- !boot_cpu_has(X86_FEATURE_OSXSAVE)) {
+ !boot_cpu_has(X86_FEATURE_AES)) {
pr_info("AVX2 or AES-NI instructions are not detected.\n");
return -ENODEV;
}
- if (!cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM,
- &feature_name)) {
- pr_info("CPU feature '%s' is not supported.\n", feature_name);
- return -ENODEV;
- }
-
return crypto_register_skciphers(sm4_aesni_avx2_skciphers,
ARRAY_SIZE(sm4_aesni_avx2_skciphers));
}
static void __exit sm4_exit(void)
diff --git a/arch/x86/crypto/sm4_aesni_avx_glue.c b/arch/x86/crypto/sm4_aesni_avx_glue.c
index 88caf418a06f..ed383da5ff46 100644
--- a/arch/x86/crypto/sm4_aesni_avx_glue.c
+++ b/arch/x86/crypto/sm4_aesni_avx_glue.c
@@ -312,25 +312,16 @@ static struct skcipher_alg sm4_aesni_avx_skciphers[] = {
}
};
static int __init sm4_init(void)
{
- const char *feature_name;
-
if (!boot_cpu_has(X86_FEATURE_AVX) ||
- !boot_cpu_has(X86_FEATURE_AES) ||
- !boot_cpu_has(X86_FEATURE_OSXSAVE)) {
+ !boot_cpu_has(X86_FEATURE_AES)) {
pr_info("AVX or AES-NI instructions are not detected.\n");
return -ENODEV;
}
- if (!cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM,
- &feature_name)) {
- pr_info("CPU feature '%s' is not supported.\n", feature_name);
- return -ENODEV;
- }
-
return crypto_register_skciphers(sm4_aesni_avx_skciphers,
ARRAY_SIZE(sm4_aesni_avx_skciphers));
}
static void __exit sm4_exit(void)
diff --git a/arch/x86/crypto/twofish_avx_glue.c b/arch/x86/crypto/twofish_avx_glue.c
index 9e20db013750..985bc54a2340 100644
--- a/arch/x86/crypto/twofish_avx_glue.c
+++ b/arch/x86/crypto/twofish_avx_glue.c
@@ -100,14 +100,12 @@ static struct skcipher_alg twofish_algs[] = {
},
};
static int __init twofish_init(void)
{
- const char *feature_name;
-
- if (!cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM, &feature_name)) {
- pr_info("CPU feature '%s' is not supported.\n", feature_name);
+ if (!boot_cpu_has(X86_FEATURE_AVX)) {
+ pr_info("AVX instructions are not detected.\n");
return -ENODEV;
}
return crypto_register_skciphers(twofish_algs,
ARRAY_SIZE(twofish_algs));
--
2.54.0