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Commit d1035d97 authored by Thomas Gleixner's avatar Thomas Gleixner
Browse files

x86/cpufeatures: Add FEATURE_ZEN 



Add a ZEN feature bit so family-dependent static_cpu_has() optimizations
can be built for ZEN.

Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
Reviewed-by: default avatarBorislav Petkov <bp@suse.de>
Reviewed-by: default avatarKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>
parent 52817587

arch/x86/include/asm/cpufeatures.h

+1 −0
Original line number Diff line number Diff line
@@ -218,6 +218,7 @@ 
#define X86_FEATURE_IBRS		( 7*32+25) /* Indirect Branch Restricted Speculation */

#define X86_FEATURE_IBPB		( 7*32+26) /* Indirect Branch Prediction Barrier */

#define X86_FEATURE_STIBP		( 7*32+27) /* Single Thread Indirect Branch Predictors */

#define X86_FEATURE_ZEN			( 7*32+28) /* "" CPU is AMD family 0x17 (Zen) */



/* Virtualization flags: Linux defined, word 8 */

#define X86_FEATURE_TPR_SHADOW		( 8*32+ 0) /* Intel TPR Shadow */

arch/x86/kernel/cpu/amd.c

+1 −0
Original line number Diff line number Diff line
@@ -812,6 +812,7 @@ static void init_amd_bd(struct cpuinfo_x86 *c) 


static void init_amd_zn(struct cpuinfo_x86 *c)

{

	set_cpu_cap(c, X86_FEATURE_ZEN);

	/*

	 * Fix erratum 1076: CPB feature bit not being set in CPUID. It affects

	 * all up to and including B1.