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x86/cpufeatures: Add X86_FEATURE_RDS

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Add the CPU feature bit CPUID.7.0.EDX[31] which indicates whether the CPU
supports Reduced Data Speculation.

[ tglx: Split it out from a later patch ]

Signed-off-by: Konrad Rzeszutek Wilk <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
Reviewed-by: Ingo Molnar <[email protected]>
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Konrad Rzeszutek Wilk authored and Thomas Gleixner committed 2018-05-03 13:55:48 +02:00
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commit 0cc5fa00b0
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arch/x86/include/asm/cpufeatures.h
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@@ -334,6 +334,7 @@
#define X86_FEATURE_SPEC_CTRL (18*32+26) /* "" Speculation Control (IBRS + IBPB) */
#define X86_FEATURE_INTEL_STIBP (18*32+27) /* "" Single Thread Indirect Branch Predictors */
#define X86_FEATURE_ARCH_CAPABILITIES (18*32+29) /* IA32_ARCH_CAPABILITIES MSR (Intel) */
#define X86_FEATURE_RDS (18*32+31) /* Reduced Data Speculation */
/*
* BUG word(s)