diff --git a/arch/x86/include/asm/fpu/xstate.h b/arch/x86/include/asm/fpu/xstate.h index d91df71f60fb..3bc08b5313b0 100644 --- a/arch/x86/include/asm/fpu/xstate.h +++ b/arch/x86/include/asm/fpu/xstate.h @@ -85,6 +85,7 @@ #endif extern u64 xfeatures_mask_all; +extern u64 xfeatures_mask_indep; static inline u64 xfeatures_mask_supervisor(void) { @@ -124,9 +125,9 @@ static inline u64 xfeatures_mask_fpstate(void) static inline u64 xfeatures_mask_independent(void) { if (!boot_cpu_has(X86_FEATURE_ARCH_LBR)) - return XFEATURE_MASK_INDEPENDENT & ~XFEATURE_MASK_LBR; + return xfeatures_mask_indep & ~XFEATURE_MASK_LBR; - return XFEATURE_MASK_INDEPENDENT; + return xfeatures_mask_indep; } extern u64 xstate_fx_sw_bytes[USER_XSTATE_FX_SW_WORDS]; diff --git a/arch/x86/kernel/fpu/xstate.c b/arch/x86/kernel/fpu/xstate.c index 81891f0fff6f..3772577462a0 100644 --- a/arch/x86/kernel/fpu/xstate.c +++ b/arch/x86/kernel/fpu/xstate.c @@ -60,6 +60,11 @@ static short xsave_cpuid_features[] __initdata = { * XSAVE buffer, both supervisor and user xstates. */ u64 xfeatures_mask_all __ro_after_init; +/* + * This represents the "independent" xfeatures that are supported by XSAVES, but not managed as part + * of the FPU core, such as LBR. + */ +u64 xfeatures_mask_indep __ro_after_init; EXPORT_SYMBOL_GPL(xfeatures_mask_all); static unsigned int xstate_offsets[XFEATURE_MAX] __ro_after_init = @@ -768,6 +773,8 @@ void __init fpu__init_system_xstate(void) goto out_disable; } + xfeatures_mask_indep = xfeatures_mask_all & XFEATURE_MASK_INDEPENDENT; + /* * Clear XSAVE features that are disabled in the normal CPUID. */