@@ -73,7 +73,6 @@ static unsigned short xsave_cpuid_features[] __initdata = {
[XFEATURE_PT_UNIMPLEMENTED_SO_FAR] = X86_FEATURE_INTEL_PT,
[XFEATURE_PKRU] = X86_FEATURE_OSPKE,
[XFEATURE_PASID] = X86_FEATURE_ENQCMD,
- [XFEATURE_CET_USER] = X86_FEATURE_SHSTK,
[XFEATURE_XTILE_CFG] = X86_FEATURE_AMX_TILE,
[XFEATURE_XTILE_DATA] = X86_FEATURE_AMX_TILE,
};
@@ -798,6 +797,14 @@ void __init fpu__init_system_xstate(unsigned int legacy_size)
fpu_kernel_cfg.max_features &= ~BIT_ULL(i);
}
+ /*
+ * CET user mode xstate bit has been cleared by above sanity check.
+ * Now pick it up if either SHSTK or IBT is available. Either feature
+ * depends on the xstate bit to save/restore user mode states.
+ */
+ if (boot_cpu_has(X86_FEATURE_SHSTK) || boot_cpu_has(X86_FEATURE_IBT))
+ fpu_kernel_cfg.max_features |= BIT_ULL(XFEATURE_CET_USER);
+
if (!cpu_feature_enabled(X86_FEATURE_XFD))
fpu_kernel_cfg.max_features &= ~XFEATURE_MASK_USER_DYNAMIC;