From: Konrad Rzeszutek Wilk Date: Wed, 20 Jun 2018 20:42:58 +0000 (-0400) Subject: x86/cpufeatures: Add detection of L1D cache flush support. X-Git-Tag: v5.15~8264^2~51 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=11e34e64e4103955fc4568750914c75d65ea87ee;p=platform%2Fkernel%2Flinux-starfive.git x86/cpufeatures: Add detection of L1D cache flush support. 336996-Speculative-Execution-Side-Channel-Mitigations.pdf defines a new MSR (IA32_FLUSH_CMD) which is detected by CPUID.7.EDX[28]=1 bit being set. This new MSR "gives software a way to invalidate structures with finer granularity than other architectual methods like WBINVD." A copy of this document is available at https://bugzilla.kernel.org/show_bug.cgi?id=199511 Signed-off-by: Konrad Rzeszutek Wilk Signed-off-by: Thomas Gleixner --- diff --git a/arch/x86/include/asm/cpufeatures.h b/arch/x86/include/asm/cpufeatures.h index f41cf9d..64aaa3f 100644 --- a/arch/x86/include/asm/cpufeatures.h +++ b/arch/x86/include/asm/cpufeatures.h @@ -342,6 +342,7 @@ #define X86_FEATURE_PCONFIG (18*32+18) /* Intel PCONFIG */ #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_FLUSH_L1D (18*32+28) /* Flush L1D cache */ #define X86_FEATURE_ARCH_CAPABILITIES (18*32+29) /* IA32_ARCH_CAPABILITIES MSR (Intel) */ #define X86_FEATURE_SPEC_CTRL_SSBD (18*32+31) /* "" Speculative Store Bypass Disable */