You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
91 lines
3.7 KiB
91 lines
3.7 KiB
Based on the following commit, adjusted for glibc-2.28 in RHEL-8:
|
|
|
|
commit 27f74636752d0c4438cf8346cf2a76b6fcf3be16
|
|
Author: H.J. Lu <hjl.tools@gmail.com>
|
|
Date: Fri Mar 19 06:15:37 2021 -0700
|
|
|
|
x86: Properly disable XSAVE related features [BZ #27605]
|
|
|
|
1. Support GLIBC_TUNABLES=glibc.cpu.hwcaps=-XSAVE.
|
|
2. Disable all features which depend on XSAVE:
|
|
a. If OSXSAVE is disabled by glibc tunables. Or
|
|
b. If both XSAVE and XSAVEC aren't usable.
|
|
|
|
diff --git a/sysdeps/x86/cpu-features.c b/sysdeps/x86/cpu-features.c
|
|
index 805d00a43309fc23..910425053d9e226f 100644
|
|
--- a/sysdeps/x86/cpu-features.c
|
|
+++ b/sysdeps/x86/cpu-features.c
|
|
@@ -654,6 +654,60 @@ no_cpuid:
|
|
= TUNABLE_GET (x86_data_cache_size, long int, NULL);
|
|
cpu_features->shared_cache_size
|
|
= TUNABLE_GET (x86_shared_cache_size, long int, NULL);
|
|
+
|
|
+ bool disable_xsave_features = false;
|
|
+
|
|
+ if (!CPU_FEATURE_USABLE_P (cpu_features, OSXSAVE))
|
|
+ {
|
|
+ /* These features are usable only if OSXSAVE is usable. */
|
|
+ CPU_FEATURE_UNSET (cpu_features, XSAVE);
|
|
+ CPU_FEATURE_UNSET (cpu_features, XSAVEOPT);
|
|
+ CPU_FEATURE_UNSET (cpu_features, XSAVEC);
|
|
+ CPU_FEATURE_UNSET (cpu_features, XGETBV_ECX_1);
|
|
+ CPU_FEATURE_UNSET (cpu_features, XFD);
|
|
+
|
|
+ disable_xsave_features = true;
|
|
+ }
|
|
+
|
|
+ if (disable_xsave_features
|
|
+ || (!CPU_FEATURE_USABLE_P (cpu_features, XSAVE)
|
|
+ && !CPU_FEATURE_USABLE_P (cpu_features, XSAVEC)))
|
|
+ {
|
|
+ /* Clear xsave_state_size if both XSAVE and XSAVEC aren't usable. */
|
|
+ cpu_features->xsave_state_size = 0;
|
|
+
|
|
+ CPU_FEATURE_UNSET (cpu_features, AVX);
|
|
+ CPU_FEATURE_UNSET (cpu_features, AVX2);
|
|
+ CPU_FEATURE_UNSET (cpu_features, AVX_VNNI);
|
|
+ CPU_FEATURE_UNSET (cpu_features, FMA);
|
|
+ CPU_FEATURE_UNSET (cpu_features, VAES);
|
|
+ CPU_FEATURE_UNSET (cpu_features, VPCLMULQDQ);
|
|
+ CPU_FEATURE_UNSET (cpu_features, XOP);
|
|
+ CPU_FEATURE_UNSET (cpu_features, F16C);
|
|
+ CPU_FEATURE_UNSET (cpu_features, AVX512F);
|
|
+ CPU_FEATURE_UNSET (cpu_features, AVX512CD);
|
|
+ CPU_FEATURE_UNSET (cpu_features, AVX512ER);
|
|
+ CPU_FEATURE_UNSET (cpu_features, AVX512PF);
|
|
+ CPU_FEATURE_UNSET (cpu_features, AVX512VL);
|
|
+ CPU_FEATURE_UNSET (cpu_features, AVX512DQ);
|
|
+ CPU_FEATURE_UNSET (cpu_features, AVX512BW);
|
|
+ CPU_FEATURE_UNSET (cpu_features, AVX512_4FMAPS);
|
|
+ CPU_FEATURE_UNSET (cpu_features, AVX512_4VNNIW);
|
|
+ CPU_FEATURE_UNSET (cpu_features, AVX512_BITALG);
|
|
+ CPU_FEATURE_UNSET (cpu_features, AVX512_IFMA);
|
|
+ CPU_FEATURE_UNSET (cpu_features, AVX512_VBMI);
|
|
+ CPU_FEATURE_UNSET (cpu_features, AVX512_VBMI2);
|
|
+ CPU_FEATURE_UNSET (cpu_features, AVX512_VNNI);
|
|
+ CPU_FEATURE_UNSET (cpu_features, AVX512_VPOPCNTDQ);
|
|
+ CPU_FEATURE_UNSET (cpu_features, AVX512_VP2INTERSECT);
|
|
+ CPU_FEATURE_UNSET (cpu_features, AVX512_BF16);
|
|
+ CPU_FEATURE_UNSET (cpu_features, AVX512_FP16);
|
|
+ CPU_FEATURE_UNSET (cpu_features, AMX_BF16);
|
|
+ CPU_FEATURE_UNSET (cpu_features, AMX_TILE);
|
|
+ CPU_FEATURE_UNSET (cpu_features, AMX_INT8);
|
|
+
|
|
+ CPU_FEATURE_UNSET (cpu_features, FMA4);
|
|
+ }
|
|
#endif
|
|
|
|
/* Reuse dl_platform, dl_hwcap and dl_hwcap_mask for x86. */
|
|
diff --git a/sysdeps/x86/cpu-tunables.c b/sysdeps/x86/cpu-tunables.c
|
|
index 0728023007a0f423..3173b2b959ca88f9 100644
|
|
--- a/sysdeps/x86/cpu-tunables.c
|
|
+++ b/sysdeps/x86/cpu-tunables.c
|
|
@@ -168,6 +168,7 @@ TUNABLE_CALLBACK (set_hwcaps) (tunable_val_t *valp)
|
|
CHECK_GLIBC_IFUNC_CPU_OFF (n, cpu_features, MOVBE, 5);
|
|
CHECK_GLIBC_IFUNC_CPU_OFF (n, cpu_features, SHSTK, 5);
|
|
CHECK_GLIBC_IFUNC_CPU_OFF (n, cpu_features, SSSE3, 5);
|
|
+ CHECK_GLIBC_IFUNC_CPU_OFF (n, cpu_features, XSAVE, 5);
|
|
}
|
|
break;
|
|
case 6:
|