linux-kernel - [tip: x86/cpu] x86/CPU/AMD: Do the common init on future Zens too

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Date: Fri, 16 Feb 2024 12:35:11 -0000
From: "tip-bot2 for Borislav Petkov (AMD)" <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc: "Borislav Petkov (AMD)" <bp@...en8.de>,
 Tom Lendacky <thomas.lendacky@....com>, x86@...nel.org,
 linux-kernel@...r.kernel.org
Subject: [tip: x86/cpu] x86/CPU/AMD: Do the common init on future Zens too

The following commit has been merged into the x86/cpu branch of tip:

Commit-ID:     03ceaf678d444e67fb9c1a372458ba869aa37a60
Gitweb:        https://git.kernel.org/tip/03ceaf678d444e67fb9c1a372458ba869aa37a60
Author:        Borislav Petkov (AMD) <bp@...en8.de>
AuthorDate:    Thu, 01 Feb 2024 17:10:24 +01:00
Committer:     Borislav Petkov (AMD) <bp@...en8.de>
CommitterDate: Fri, 16 Feb 2024 13:15:12 +01:00

x86/CPU/AMD: Do the common init on future Zens too

There's no need to enable the common Zen init stuff for each new family
- just do it by default on everything >= 0x17 family.

Signed-off-by: Borislav Petkov (AMD) <bp@...en8.de>
Reviewed-by: Tom Lendacky <thomas.lendacky@....com>
Link: https://lore.kernel.org/r/20240201161024.30839-1-bp@alien8.de
---
 arch/x86/kernel/cpu/amd.c | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/arch/x86/kernel/cpu/amd.c b/arch/x86/kernel/cpu/amd.c
index f3abca3..fc042af 100644
--- a/arch/x86/kernel/cpu/amd.c
+++ b/arch/x86/kernel/cpu/amd.c
@@ -969,7 +969,6 @@ static void init_amd_zen_common(void)
 
 static void init_amd_zen1(struct cpuinfo_x86 *c)
 {
-	init_amd_zen_common();
 	fix_erratum_1386(c);
 
 	/* Fix up CPUID bits, but only if not virtualised. */
@@ -1023,7 +1022,6 @@ static void zen2_zenbleed_check(struct cpuinfo_x86 *c)
 
 static void init_amd_zen2(struct cpuinfo_x86 *c)
 {
-	init_amd_zen_common();
 	init_spectral_chicken(c);
 	fix_erratum_1386(c);
 	zen2_zenbleed_check(c);
@@ -1031,8 +1029,6 @@ static void init_amd_zen2(struct cpuinfo_x86 *c)
 
 static void init_amd_zen3(struct cpuinfo_x86 *c)
 {
-	init_amd_zen_common();
-
 	if (!cpu_has(c, X86_FEATURE_HYPERVISOR)) {
 		/*
 		 * Zen3 (Fam19 model < 0x10) parts are not susceptible to
@@ -1046,15 +1042,12 @@ static void init_amd_zen3(struct cpuinfo_x86 *c)
 
 static void init_amd_zen4(struct cpuinfo_x86 *c)
 {
-	init_amd_zen_common();
-
 	if (!cpu_has(c, X86_FEATURE_HYPERVISOR))
 		msr_set_bit(MSR_ZEN4_BP_CFG, MSR_ZEN4_BP_CFG_SHARED_BTB_FIX_BIT);
 }
 
 static void init_amd_zen5(struct cpuinfo_x86 *c)
 {
-	init_amd_zen_common();
 }
 
 static void init_amd(struct cpuinfo_x86 *c)
@@ -1094,6 +1087,13 @@ static void init_amd(struct cpuinfo_x86 *c)
 	case 0x16: init_amd_jg(c); break;
 	}
 
+	/*
+	 * Save up on some future enablement work and do common Zen
+	 * settings.
+	 */
+	if (c->x86 >= 0x17)
+		init_amd_zen_common();
+
 	if (boot_cpu_has(X86_FEATURE_ZEN1))
 		init_amd_zen1(c);
 	else if (boot_cpu_has(X86_FEATURE_ZEN2))