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179 lines
8.2 KiB
179 lines
8.2 KiB
9 months ago
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commit 04bba1e5d84b6fd8d3a3b006bc240cd5d241ee30
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Author: H.J. Lu <hjl.tools@gmail.com>
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Date: Wed Aug 5 13:51:56 2020 -0700
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x86: Set CPU usable feature bits conservatively [BZ #26552]
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Set CPU usable feature bits only for CPU features which are usable in
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user space and whose usability can be detected from user space, excluding
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features like FSGSBASE whose enable bit can only be checked in the kernel.
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diff --git a/sysdeps/x86/cpu-features.c b/sysdeps/x86/cpu-features.c
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index f13a1df4555c7000..6954728c47d0126b 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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@@ -44,107 +44,55 @@ extern void TUNABLE_CALLBACK (set_x86_shstk) (tunable_val_t *)
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static void
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update_usable (struct cpu_features *cpu_features)
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{
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- /* Before COMMON_CPUID_INDEX_80000001, copy the cpuid array elements to
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- the usable array. */
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- unsigned int i;
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- for (i = 0; i < COMMON_CPUID_INDEX_80000001; i++)
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- cpu_features->features[i].usable = cpu_features->features[i].cpuid;
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-
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- /* Before COMMON_CPUID_INDEX_80000001, clear the unknown usable bits
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- and the always zero bits. */
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- CPU_FEATURE_UNSET (cpu_features, INDEX_1_ECX_16);
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- CPU_FEATURE_UNSET (cpu_features, INDEX_1_ECX_31);
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- CPU_FEATURE_UNSET (cpu_features, INDEX_1_EDX_10);
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- CPU_FEATURE_UNSET (cpu_features, INDEX_1_EDX_20);
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- CPU_FEATURE_UNSET (cpu_features, INDEX_1_EDX_30);
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- CPU_FEATURE_UNSET (cpu_features, INDEX_7_EBX_6);
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- CPU_FEATURE_UNSET (cpu_features, INDEX_7_EBX_22);
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- CPU_FEATURE_UNSET (cpu_features, INDEX_7_ECX_13);
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- CPU_FEATURE_UNSET (cpu_features, INDEX_7_ECX_15);
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- CPU_FEATURE_UNSET (cpu_features, INDEX_7_ECX_16);
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- CPU_FEATURE_UNSET (cpu_features, INDEX_7_ECX_23);
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- CPU_FEATURE_UNSET (cpu_features, INDEX_7_ECX_24);
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- CPU_FEATURE_UNSET (cpu_features, INDEX_7_ECX_26);
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- CPU_FEATURE_UNSET (cpu_features, INDEX_7_EDX_0);
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- CPU_FEATURE_UNSET (cpu_features, INDEX_7_EDX_1);
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- CPU_FEATURE_UNSET (cpu_features, INDEX_7_EDX_5);
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- CPU_FEATURE_UNSET (cpu_features, INDEX_7_EDX_6);
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- CPU_FEATURE_UNSET (cpu_features, INDEX_7_EDX_7);
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- CPU_FEATURE_UNSET (cpu_features, INDEX_7_EDX_9);
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- CPU_FEATURE_UNSET (cpu_features, INDEX_7_EDX_11);
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- CPU_FEATURE_UNSET (cpu_features, INDEX_7_EDX_12);
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- CPU_FEATURE_UNSET (cpu_features, INDEX_7_EDX_13);
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- CPU_FEATURE_UNSET (cpu_features, INDEX_7_EDX_17);
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- CPU_FEATURE_UNSET (cpu_features, INDEX_7_EDX_19);
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- CPU_FEATURE_UNSET (cpu_features, INDEX_7_EDX_21);
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- CPU_FEATURE_UNSET (cpu_features, INDEX_7_EDX_23);
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-
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- /* EAX/EBX from COMMON_CPUID_INDEX_1 and EAX from COMMON_CPUID_INDEX_7
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- aren't used for CPU feature detection. */
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- cpu_features->features[COMMON_CPUID_INDEX_1].usable.eax = 0;
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- cpu_features->features[COMMON_CPUID_INDEX_1].usable.ebx = 0;
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- cpu_features->features[COMMON_CPUID_INDEX_7].usable.eax = 0;
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-
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- /* Starting from COMMON_CPUID_INDEX_80000001, copy the cpuid bits to
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- usable bits. */
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+ /* Copy the cpuid bits to usable bits for CPU featuress whose usability
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+ in user space can be detected without additonal OS support. */
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+ CPU_FEATURE_SET_USABLE (cpu_features, SSE3);
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+ CPU_FEATURE_SET_USABLE (cpu_features, PCLMULQDQ);
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+ CPU_FEATURE_SET_USABLE (cpu_features, SSSE3);
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+ CPU_FEATURE_SET_USABLE (cpu_features, CMPXCHG16B);
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+ CPU_FEATURE_SET_USABLE (cpu_features, SSE4_1);
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+ CPU_FEATURE_SET_USABLE (cpu_features, SSE4_2);
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+ CPU_FEATURE_SET_USABLE (cpu_features, MOVBE);
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+ CPU_FEATURE_SET_USABLE (cpu_features, POPCNT);
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+ CPU_FEATURE_SET_USABLE (cpu_features, AES);
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+ CPU_FEATURE_SET_USABLE (cpu_features, OSXSAVE);
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+ CPU_FEATURE_SET_USABLE (cpu_features, TSC);
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+ CPU_FEATURE_SET_USABLE (cpu_features, CX8);
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+ CPU_FEATURE_SET_USABLE (cpu_features, CMOV);
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+ CPU_FEATURE_SET_USABLE (cpu_features, CLFSH);
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+ CPU_FEATURE_SET_USABLE (cpu_features, MMX);
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+ CPU_FEATURE_SET_USABLE (cpu_features, FXSR);
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+ CPU_FEATURE_SET_USABLE (cpu_features, SSE);
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+ CPU_FEATURE_SET_USABLE (cpu_features, SSE2);
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+ CPU_FEATURE_SET_USABLE (cpu_features, HTT);
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+ CPU_FEATURE_SET_USABLE (cpu_features, BMI1);
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+ CPU_FEATURE_SET_USABLE (cpu_features, HLE);
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+ CPU_FEATURE_SET_USABLE (cpu_features, BMI2);
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+ CPU_FEATURE_SET_USABLE (cpu_features, ERMS);
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+ CPU_FEATURE_SET_USABLE (cpu_features, RTM);
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+ CPU_FEATURE_SET_USABLE (cpu_features, RDSEED);
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+ CPU_FEATURE_SET_USABLE (cpu_features, ADX);
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+ CPU_FEATURE_SET_USABLE (cpu_features, CLFLUSHOPT);
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+ CPU_FEATURE_SET_USABLE (cpu_features, CLWB);
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+ CPU_FEATURE_SET_USABLE (cpu_features, SHA);
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+ CPU_FEATURE_SET_USABLE (cpu_features, PREFETCHWT1);
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+ CPU_FEATURE_SET_USABLE (cpu_features, OSPKE);
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+ CPU_FEATURE_SET_USABLE (cpu_features, WAITPKG);
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+ CPU_FEATURE_SET_USABLE (cpu_features, GFNI);
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+ CPU_FEATURE_SET_USABLE (cpu_features, RDPID);
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+ CPU_FEATURE_SET_USABLE (cpu_features, CLDEMOTE);
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+ CPU_FEATURE_SET_USABLE (cpu_features, MOVDIRI);
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+ CPU_FEATURE_SET_USABLE (cpu_features, MOVDIR64B);
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+ CPU_FEATURE_SET_USABLE (cpu_features, FSRM);
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+ CPU_FEATURE_SET_USABLE (cpu_features, SERIALIZE);
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+ CPU_FEATURE_SET_USABLE (cpu_features, TSXLDTRK);
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CPU_FEATURE_SET_USABLE (cpu_features, LAHF64_SAHF64);
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- CPU_FEATURE_SET_USABLE (cpu_features, SVM);
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CPU_FEATURE_SET_USABLE (cpu_features, LZCNT);
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CPU_FEATURE_SET_USABLE (cpu_features, SSE4A);
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CPU_FEATURE_SET_USABLE (cpu_features, PREFETCHW);
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- CPU_FEATURE_SET_USABLE (cpu_features, XOP);
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- CPU_FEATURE_SET_USABLE (cpu_features, LWP);
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- CPU_FEATURE_SET_USABLE (cpu_features, FMA4);
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CPU_FEATURE_SET_USABLE (cpu_features, TBM);
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- CPU_FEATURE_SET_USABLE (cpu_features, SYSCALL_SYSRET);
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- CPU_FEATURE_SET_USABLE (cpu_features, NX);
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- CPU_FEATURE_SET_USABLE (cpu_features, PAGE1GB);
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CPU_FEATURE_SET_USABLE (cpu_features, RDTSCP);
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- CPU_FEATURE_SET_USABLE (cpu_features, LM);
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- CPU_FEATURE_SET_USABLE (cpu_features, XSAVEOPT);
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- CPU_FEATURE_SET_USABLE (cpu_features, XSAVEC);
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- CPU_FEATURE_SET_USABLE (cpu_features, XGETBV_ECX_1);
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- CPU_FEATURE_SET_USABLE (cpu_features, XSAVES);
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- CPU_FEATURE_SET_USABLE (cpu_features, XFD);
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- CPU_FEATURE_SET_USABLE (cpu_features, INVARIANT_TSC);
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CPU_FEATURE_SET_USABLE (cpu_features, WBNOINVD);
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- CPU_FEATURE_SET_USABLE (cpu_features, AVX512_BF16);
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-
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- /* MPX has been deprecated. */
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- CPU_FEATURE_UNSET (cpu_features, MPX);
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-
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- /* Clear the usable bits which require OS support. */
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- CPU_FEATURE_UNSET (cpu_features, FMA);
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- CPU_FEATURE_UNSET (cpu_features, AVX);
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- CPU_FEATURE_UNSET (cpu_features, F16C);
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- CPU_FEATURE_UNSET (cpu_features, AVX2);
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- CPU_FEATURE_UNSET (cpu_features, AVX512F);
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- CPU_FEATURE_UNSET (cpu_features, AVX512DQ);
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- CPU_FEATURE_UNSET (cpu_features, AVX512_IFMA);
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- CPU_FEATURE_UNSET (cpu_features, AVX512PF);
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- CPU_FEATURE_UNSET (cpu_features, AVX512ER);
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- CPU_FEATURE_UNSET (cpu_features, AVX512CD);
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- CPU_FEATURE_UNSET (cpu_features, AVX512BW);
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- CPU_FEATURE_UNSET (cpu_features, AVX512VL);
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- CPU_FEATURE_UNSET (cpu_features, AVX512_VBMI);
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- CPU_FEATURE_UNSET (cpu_features, PKU);
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- CPU_FEATURE_UNSET (cpu_features, AVX512_VBMI2);
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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, AVX512_VNNI);
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- CPU_FEATURE_UNSET (cpu_features, AVX512_BITALG);
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- CPU_FEATURE_UNSET (cpu_features, AVX512_VPOPCNTDQ);
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- CPU_FEATURE_UNSET (cpu_features, AVX512_4VNNIW);
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- CPU_FEATURE_UNSET (cpu_features, AVX512_4FMAPS);
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- CPU_FEATURE_UNSET (cpu_features, AVX512_VP2INTERSECT);
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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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- CPU_FEATURE_UNSET (cpu_features, XOP);
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- CPU_FEATURE_UNSET (cpu_features, FMA4);
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- CPU_FEATURE_UNSET (cpu_features, XSAVEC);
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- CPU_FEATURE_UNSET (cpu_features, XFD);
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- CPU_FEATURE_UNSET (cpu_features, AVX512_BF16);
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/* Can we call xgetbv? */
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if (CPU_FEATURES_CPU_P (cpu_features, OSXSAVE))
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@@ -243,8 +191,11 @@ update_usable (struct cpu_features *cpu_features)
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CPU_FEATURE_SET_USABLE (cpu_features, AMX_INT8);
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}
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-
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- /* XFD is usable only when OSXSAVE is enabled. */
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+ /* These features are usable only when OSXSAVE is enabled. */
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+ CPU_FEATURE_SET (cpu_features, XSAVE);
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+ CPU_FEATURE_SET_USABLE (cpu_features, XSAVEOPT);
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+ CPU_FEATURE_SET_USABLE (cpu_features, XSAVEC);
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+ CPU_FEATURE_SET_USABLE (cpu_features, XGETBV_ECX_1);
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CPU_FEATURE_SET_USABLE (cpu_features, XFD);
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/* For _dl_runtime_resolve, set xsave_state_size to xsave area
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