linux-kernel - [PATCH] x86/mce: Use ZENx features for Zen IF quirk

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-ID: <20250811-wip-mca-reduce-if-quirk-v1-1-4e0f24d94872@amd.com>
Date: Mon, 11 Aug 2025 16:34:08 -0400
From: Yazen Ghannam <yazen.ghannam@....com>
To: <x86@...nel.org>, Tony Luck <tony.luck@...el.com>
CC: <linux-edac@...r.kernel.org>, <linux-kernel@...r.kernel.org>, "Yazen
 Ghannam" <yazen.ghannam@....com>
Subject: [PATCH] x86/mce: Use ZENx features for Zen IF quirk

Zen1 through Zen5 systems have a quirk related to Instruction Fetch
poison consumption.

Currently, the quirk is applied to families 17h, 18h, 19h, and 1Ah.
However, family numbers don't apply directly to Zen CPU revisions.

Update the quirk check to use the "X86_FEATURE_ZEN" CPU features to
apply only to affected CPU revisions.

Signed-off-by: Yazen Ghannam <yazen.ghannam@....com>
---
 arch/x86/kernel/cpu/mce/core.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kernel/cpu/mce/core.c b/arch/x86/kernel/cpu/mce/core.c
index 4da4eab56c81..0ef164568077 100644
--- a/arch/x86/kernel/cpu/mce/core.c
+++ b/arch/x86/kernel/cpu/mce/core.c
@@ -1951,8 +1951,11 @@ static void apply_quirks_amd(struct cpuinfo_x86 *c)
 	if (c->x86 == 0x15 && c->x86_model <= 0xf)
 		mce_flags.overflow_recov = 1;
 
-	if (c->x86 >= 0x17 && c->x86 <= 0x1A)
-		mce_flags.zen_ifu_quirk = 1;
+	mce_flags.zen_ifu_quirk = cpu_feature_enabled(X86_FEATURE_ZEN1) ||
+				  cpu_feature_enabled(X86_FEATURE_ZEN2) ||
+				  cpu_feature_enabled(X86_FEATURE_ZEN3) ||
+				  cpu_feature_enabled(X86_FEATURE_ZEN4) ||
+				  cpu_feature_enabled(X86_FEATURE_ZEN5);
 }
 
 static void apply_quirks_intel(struct cpuinfo_x86 *c)

---
base-commit: 8f5ae30d69d7543eee0d70083daf4de8fe15d585
change-id: 20250811-wip-mca-reduce-if-quirk-83a9744fa057