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: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>

diff --git a/arch/x86/include/asm/cpufeatures.h b/arch/x86/include/asm/cpufeatures.h
index 61c34c1a525cfa0652f1e41e49910d117bfe83b4..8099be4fc3e1f3be0cf8748e0d635d62a76327fc 100644 (file)
--- a/arch/x86/include/asm/cpufeatures.h
+++ b/arch/x86/include/asm/cpufeatures.h
@@ -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 */

diff --git a/arch/x86/kernel/cpu/amd.c b/arch/x86/kernel/cpu/amd.c
index 2d2d8985654b290d75001e3edea24c79ee8eced5..1b18be3f35a8e8fdb34db6feff1ee8e416a73c96 100644 (file)
--- a/arch/x86/kernel/cpu/amd.c
+++ b/arch/x86/kernel/cpu/amd.c
@@ -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.