linux-kernel - [PATCH] x86/CPU/AMD: Add X86_FEATURE

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Date:   Sat, 2 Dec 2023 13:49:01 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     Tom Lendacky <thomas.lendacky@....com>,
        Brian Gerst <brgerst@...il.com>
Cc:     X86 ML <x86@...nel.org>, LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH] x86/CPU/AMD: Add X86_FEATURE_ZEN1

From: "Borislav Petkov (AMD)" <bp@...en8.de>
Date: Sat, 2 Dec 2023 12:50:23 +0100

Add a synthetic feature flag specifically for first generation Zen
machines. There's need to have a generic flag for all Zen generations so
make X86_FEATURE_ZEN be that flag.

Fixes: 30fa92832f40 ("x86/CPU/AMD: Add ZenX generations flags")
Suggested-by: Brian Gerst <brgerst@...il.com>
Suggested-by: Tom Lendacky <thomas.lendacky@....com>
Signed-off-by: Borislav Petkov (AMD) <bp@...en8.de>
Link: https://lore.kernel.org/r/dc3835e3-0731-4230-bbb9-336bbe3d042b@amd.com
---
 arch/x86/include/asm/cpufeatures.h       | 3 ++-
 arch/x86/kernel/cpu/amd.c                | 7 ++++---
 tools/arch/x86/include/asm/cpufeatures.h | 2 +-
 3 files changed, 7 insertions(+), 5 deletions(-)

diff --git a/arch/x86/include/asm/cpufeatures.h b/arch/x86/include/asm/cpufeatures.h
index 149cc5d5c2ae..632c26cdeeda 100644
--- a/arch/x86/include/asm/cpufeatures.h
+++ b/arch/x86/include/asm/cpufeatures.h
@@ -218,7 +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 based on Zen microarchitecture */
+#define X86_FEATURE_ZEN			( 7*32+28) /* "" Generic flag for all Zen and newer */
 #define X86_FEATURE_L1TF_PTEINV		( 7*32+29) /* "" L1TF workaround PTE inversion */
 #define X86_FEATURE_IBRS_ENHANCED	( 7*32+30) /* Enhanced IBRS */
 #define X86_FEATURE_MSR_IA32_FEAT_CTL	( 7*32+31) /* "" MSR IA32_FEAT_CTL configured */
@@ -315,6 +315,7 @@
 #define X86_FEATURE_ZEN2		(11*32+28) /* "" CPU based on Zen2 microarchitecture */
 #define X86_FEATURE_ZEN3		(11*32+29) /* "" CPU based on Zen3 microarchitecture */
 #define X86_FEATURE_ZEN4		(11*32+30) /* "" CPU based on Zen4 microarchitecture */
+#define X86_FEATURE_ZEN1		(11*32+31) /* "" CPU based on Zen1 microarchitecture */
 
 /* Intel-defined CPU features, CPUID level 0x00000007:1 (EAX), word 12 */
 #define X86_FEATURE_AVX_VNNI		(12*32+ 4) /* AVX VNNI instructions */
diff --git a/arch/x86/kernel/cpu/amd.c b/arch/x86/kernel/cpu/amd.c
index 9a2e0ec8d0f9..68669158faa4 100644
--- a/arch/x86/kernel/cpu/amd.c
+++ b/arch/x86/kernel/cpu/amd.c
@@ -542,7 +542,7 @@ static void bsp_init_amd(struct cpuinfo_x86 *c)
 		switch (c->x86_model) {
 		case 0x00 ... 0x2f:
 		case 0x50 ... 0x5f:
-			setup_force_cpu_cap(X86_FEATURE_ZEN);
+			setup_force_cpu_cap(X86_FEATURE_ZEN1);
 			break;
 		case 0x30 ... 0x4f:
 		case 0x60 ... 0x7f:
@@ -948,6 +948,7 @@ void init_spectral_chicken(struct cpuinfo_x86 *c)
 
 static void init_amd_zen_common(void)
 {
+	setup_force_cpu_cap(X86_FEATURE_ZEN);
 #ifdef CONFIG_NUMA
 	node_reclaim_distance = 32;
 #endif
@@ -1075,7 +1076,7 @@ static void init_amd(struct cpuinfo_x86 *c)
 	case 0x16: init_amd_jg(c); break;
 	}
 
-	if (boot_cpu_has(X86_FEATURE_ZEN))
+	if (boot_cpu_has(X86_FEATURE_ZEN1))
 		init_amd_zen(c);
 	else if (boot_cpu_has(X86_FEATURE_ZEN2))
 		init_amd_zen2(c);
@@ -1143,7 +1144,7 @@ static void init_amd(struct cpuinfo_x86 *c)
 	 * Counter May Be Inaccurate".
 	 */
 	if (cpu_has(c, X86_FEATURE_IRPERF) &&
-	    (boot_cpu_has(X86_FEATURE_ZEN) && c->x86_model > 0x2f))
+	    (boot_cpu_has(X86_FEATURE_ZEN1) && c->x86_model > 0x2f))
 		msr_set_bit(MSR_K7_HWCR, MSR_K7_HWCR_IRPERF_EN_BIT);
 
 	check_null_seg_clears_base(c);
diff --git a/tools/arch/x86/include/asm/cpufeatures.h b/tools/arch/x86/include/asm/cpufeatures.h
index 4af140cf5719..f4542d2718f4 100644
--- a/tools/arch/x86/include/asm/cpufeatures.h
+++ b/tools/arch/x86/include/asm/cpufeatures.h
@@ -218,7 +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 based on Zen microarchitecture */
+#define X86_FEATURE_ZEN			( 7*32+28) /* "" Generic flag for all Zen and newer */
 #define X86_FEATURE_L1TF_PTEINV		( 7*32+29) /* "" L1TF workaround PTE inversion */
 #define X86_FEATURE_IBRS_ENHANCED	( 7*32+30) /* Enhanced IBRS */
 #define X86_FEATURE_MSR_IA32_FEAT_CTL	( 7*32+31) /* "" MSR IA32_FEAT_CTL configured */
-- 
2.42.0.rc0.25.ga82fb66fed25


-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette