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Commit 53c434e7 authored by Thomas Gleixner's avatar Thomas Gleixner Committed by Greg Kroah-Hartman
Browse files

x86/cpufeatures: Add FEATURE_ZEN 



commit d1035d971829dcf80e8686ccde26f94b0a069472 upstream

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>
Signed-off-by: default avatarDavid Woodhouse <dwmw@amazon.co.uk>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 5a63725c

arch/x86/include/asm/cpufeatures.h

+2 −0
Original line number Diff line number Diff line
@@ -212,6 +212,8 @@ 
#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
@@ -751,6 +751,7 @@ 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.