summaryrefslogtreecommitdiff
path: root/arch/x86/kernel/cpu/cpuid-deps.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/x86/kernel/cpu/cpuid-deps.c')
-rw-r--r--arch/x86/kernel/cpu/cpuid-deps.c149
1 files changed, 110 insertions, 39 deletions
diff --git a/arch/x86/kernel/cpu/cpuid-deps.c b/arch/x86/kernel/cpu/cpuid-deps.c
index 2c0bd38a44ab..146f6f8b0650 100644
--- a/arch/x86/kernel/cpu/cpuid-deps.c
+++ b/arch/x86/kernel/cpu/cpuid-deps.c
@@ -20,45 +20,78 @@ struct cpuid_dep {
* but it's difficult to tell that to the init reference checker.
*/
static const struct cpuid_dep cpuid_deps[] = {
- { X86_FEATURE_XSAVEOPT, X86_FEATURE_XSAVE },
- { X86_FEATURE_XSAVEC, X86_FEATURE_XSAVE },
- { X86_FEATURE_XSAVES, X86_FEATURE_XSAVE },
- { X86_FEATURE_AVX, X86_FEATURE_XSAVE },
- { X86_FEATURE_PKU, X86_FEATURE_XSAVE },
- { X86_FEATURE_MPX, X86_FEATURE_XSAVE },
- { X86_FEATURE_XGETBV1, X86_FEATURE_XSAVE },
- { X86_FEATURE_FXSR_OPT, X86_FEATURE_FXSR },
- { X86_FEATURE_XMM, X86_FEATURE_FXSR },
- { X86_FEATURE_XMM2, X86_FEATURE_XMM },
- { X86_FEATURE_XMM3, X86_FEATURE_XMM2 },
- { X86_FEATURE_XMM4_1, X86_FEATURE_XMM2 },
- { X86_FEATURE_XMM4_2, X86_FEATURE_XMM2 },
- { X86_FEATURE_XMM3, X86_FEATURE_XMM2 },
- { X86_FEATURE_PCLMULQDQ, X86_FEATURE_XMM2 },
- { X86_FEATURE_SSSE3, X86_FEATURE_XMM2, },
- { X86_FEATURE_F16C, X86_FEATURE_XMM2, },
- { X86_FEATURE_AES, X86_FEATURE_XMM2 },
- { X86_FEATURE_SHA_NI, X86_FEATURE_XMM2 },
- { X86_FEATURE_FMA, X86_FEATURE_AVX },
- { X86_FEATURE_AVX2, X86_FEATURE_AVX, },
- { X86_FEATURE_AVX512F, X86_FEATURE_AVX, },
- { X86_FEATURE_AVX512IFMA, X86_FEATURE_AVX512F },
- { X86_FEATURE_AVX512PF, X86_FEATURE_AVX512F },
- { X86_FEATURE_AVX512ER, X86_FEATURE_AVX512F },
- { X86_FEATURE_AVX512CD, X86_FEATURE_AVX512F },
- { X86_FEATURE_AVX512DQ, X86_FEATURE_AVX512F },
- { X86_FEATURE_AVX512BW, X86_FEATURE_AVX512F },
- { X86_FEATURE_AVX512VL, X86_FEATURE_AVX512F },
- { X86_FEATURE_AVX512VBMI, X86_FEATURE_AVX512F },
- { X86_FEATURE_AVX512_VBMI2, X86_FEATURE_AVX512VL },
- { X86_FEATURE_GFNI, X86_FEATURE_AVX512VL },
- { X86_FEATURE_VAES, X86_FEATURE_AVX512VL },
- { X86_FEATURE_VPCLMULQDQ, X86_FEATURE_AVX512VL },
- { X86_FEATURE_AVX512_VNNI, X86_FEATURE_AVX512VL },
- { X86_FEATURE_AVX512_BITALG, X86_FEATURE_AVX512VL },
- { X86_FEATURE_AVX512_4VNNIW, X86_FEATURE_AVX512F },
- { X86_FEATURE_AVX512_4FMAPS, X86_FEATURE_AVX512F },
- { X86_FEATURE_AVX512_VPOPCNTDQ, X86_FEATURE_AVX512F },
+ { X86_FEATURE_FXSR, X86_FEATURE_FPU },
+ { X86_FEATURE_XSAVEOPT, X86_FEATURE_XSAVE },
+ { X86_FEATURE_XSAVEC, X86_FEATURE_XSAVE },
+ { X86_FEATURE_XSAVES, X86_FEATURE_XSAVE },
+ { X86_FEATURE_AVX, X86_FEATURE_XSAVE },
+ { X86_FEATURE_PKU, X86_FEATURE_XSAVE },
+ { X86_FEATURE_MPX, X86_FEATURE_XSAVE },
+ { X86_FEATURE_XGETBV1, X86_FEATURE_XSAVE },
+ { X86_FEATURE_APX, X86_FEATURE_XSAVE },
+ { X86_FEATURE_CMOV, X86_FEATURE_FXSR },
+ { X86_FEATURE_MMX, X86_FEATURE_FXSR },
+ { X86_FEATURE_MMXEXT, X86_FEATURE_MMX },
+ { X86_FEATURE_FXSR_OPT, X86_FEATURE_FXSR },
+ { X86_FEATURE_XSAVE, X86_FEATURE_FXSR },
+ { X86_FEATURE_XMM, X86_FEATURE_FXSR },
+ { X86_FEATURE_XMM2, X86_FEATURE_XMM },
+ { X86_FEATURE_XMM3, X86_FEATURE_XMM2 },
+ { X86_FEATURE_XMM4_1, X86_FEATURE_XMM2 },
+ { X86_FEATURE_XMM4_2, X86_FEATURE_XMM2 },
+ { X86_FEATURE_XMM3, X86_FEATURE_XMM2 },
+ { X86_FEATURE_PCLMULQDQ, X86_FEATURE_XMM2 },
+ { X86_FEATURE_SSSE3, X86_FEATURE_XMM2, },
+ { X86_FEATURE_F16C, X86_FEATURE_XMM2, },
+ { X86_FEATURE_AES, X86_FEATURE_XMM2 },
+ { X86_FEATURE_SHA_NI, X86_FEATURE_XMM2 },
+ { X86_FEATURE_GFNI, X86_FEATURE_XMM2 },
+ { X86_FEATURE_AVX_VNNI, X86_FEATURE_AVX },
+ { X86_FEATURE_FMA, X86_FEATURE_AVX },
+ { X86_FEATURE_VAES, X86_FEATURE_AVX },
+ { X86_FEATURE_VPCLMULQDQ, X86_FEATURE_AVX },
+ { X86_FEATURE_AVX2, X86_FEATURE_AVX, },
+ { X86_FEATURE_AVX512F, X86_FEATURE_AVX, },
+ { X86_FEATURE_AVX512IFMA, X86_FEATURE_AVX512F },
+ { X86_FEATURE_AVX512PF, X86_FEATURE_AVX512F },
+ { X86_FEATURE_AVX512ER, X86_FEATURE_AVX512F },
+ { X86_FEATURE_AVX512CD, X86_FEATURE_AVX512F },
+ { X86_FEATURE_AVX512DQ, X86_FEATURE_AVX512F },
+ { X86_FEATURE_AVX512BW, X86_FEATURE_AVX512F },
+ { X86_FEATURE_AVX512VL, X86_FEATURE_AVX512F },
+ { X86_FEATURE_AVX512VBMI, X86_FEATURE_AVX512F },
+ { X86_FEATURE_AVX512_VBMI2, X86_FEATURE_AVX512VL },
+ { X86_FEATURE_AVX512_VNNI, X86_FEATURE_AVX512VL },
+ { X86_FEATURE_AVX512_BITALG, X86_FEATURE_AVX512VL },
+ { X86_FEATURE_AVX512_4VNNIW, X86_FEATURE_AVX512F },
+ { X86_FEATURE_AVX512_4FMAPS, X86_FEATURE_AVX512F },
+ { X86_FEATURE_AVX512_VPOPCNTDQ, X86_FEATURE_AVX512F },
+ { X86_FEATURE_AVX512_VP2INTERSECT, X86_FEATURE_AVX512VL },
+ { X86_FEATURE_CQM_OCCUP_LLC, X86_FEATURE_CQM_LLC },
+ { X86_FEATURE_CQM_MBM_TOTAL, X86_FEATURE_CQM_LLC },
+ { X86_FEATURE_CQM_MBM_LOCAL, X86_FEATURE_CQM_LLC },
+ { X86_FEATURE_BMEC, X86_FEATURE_CQM_MBM_TOTAL },
+ { X86_FEATURE_BMEC, X86_FEATURE_CQM_MBM_LOCAL },
+ { X86_FEATURE_SDCIAE, X86_FEATURE_CAT_L3 },
+ { X86_FEATURE_AVX512_BF16, X86_FEATURE_AVX512VL },
+ { X86_FEATURE_AVX512_FP16, X86_FEATURE_AVX512BW },
+ { X86_FEATURE_ENQCMD, X86_FEATURE_XSAVES },
+ { X86_FEATURE_PER_THREAD_MBA, X86_FEATURE_MBA },
+ { X86_FEATURE_SGX_LC, X86_FEATURE_SGX },
+ { X86_FEATURE_SGX1, X86_FEATURE_SGX },
+ { X86_FEATURE_SGX2, X86_FEATURE_SGX1 },
+ { X86_FEATURE_SGX_EUPDATESVN, X86_FEATURE_SGX1 },
+ { X86_FEATURE_SGX_EDECCSSA, X86_FEATURE_SGX1 },
+ { X86_FEATURE_XFD, X86_FEATURE_XSAVES },
+ { X86_FEATURE_XFD, X86_FEATURE_XGETBV1 },
+ { X86_FEATURE_AMX_TILE, X86_FEATURE_XFD },
+ { X86_FEATURE_AMX_FP16, X86_FEATURE_AMX_TILE },
+ { X86_FEATURE_AMX_BF16, X86_FEATURE_AMX_TILE },
+ { X86_FEATURE_AMX_INT8, X86_FEATURE_AMX_TILE },
+ { X86_FEATURE_SHSTK, X86_FEATURE_XSAVES },
+ { X86_FEATURE_FRED, X86_FEATURE_LKGS },
+ { X86_FEATURE_SPEC_CTRL_SSBD, X86_FEATURE_SPEC_CTRL },
+ { X86_FEATURE_LASS, X86_FEATURE_SMAP },
{}
};
@@ -89,6 +122,9 @@ static void do_clear_cpu_cap(struct cpuinfo_x86 *c, unsigned int feature)
if (WARN_ON(feature >= MAX_FEATURE_BITS))
return;
+ if (boot_cpu_has(feature))
+ WARN_ON(alternatives_patched);
+
clear_feature(c, feature);
/* Collect all features to disable, handling dependencies */
@@ -119,3 +155,38 @@ void setup_clear_cpu_cap(unsigned int feature)
{
do_clear_cpu_cap(NULL, feature);
}
+
+/*
+ * Return the feature "name" if available, otherwise return
+ * the X86_FEATURE_* numerals to make it easier to identify
+ * the feature.
+ */
+static const char *x86_feature_name(unsigned int feature, char *buf)
+{
+ if (x86_cap_flags[feature])
+ return x86_cap_flags[feature];
+
+ snprintf(buf, 16, "%d*32+%2d", feature / 32, feature % 32);
+
+ return buf;
+}
+
+void check_cpufeature_deps(struct cpuinfo_x86 *c)
+{
+ char feature_buf[16], depends_buf[16];
+ const struct cpuid_dep *d;
+
+ for (d = cpuid_deps; d->feature; d++) {
+ if (cpu_has(c, d->feature) && !cpu_has(c, d->depends)) {
+ /*
+ * Only warn about the first unmet dependency on the
+ * first CPU where it is encountered to avoid spamming
+ * the kernel log.
+ */
+ pr_warn_once("x86 CPU feature dependency check failure: CPU%d has '%s' enabled but '%s' disabled. Kernel might be fine, but no guarantees.\n",
+ smp_processor_id(),
+ x86_feature_name(d->feature, feature_buf),
+ x86_feature_name(d->depends, depends_buf));
+ }
+ }
+}
generated by cgit (git 2.34.1) at 2025-12-24 23:06:12 +0000