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