linux-kernel - [PATCH v2] x86/apic: Drop useless CXL/CPX row from the TSC deadline errata table

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Message-Id: <20260106181434.710599-1-andrew.cooper3@citrix.com>
Date: Tue,  6 Jan 2026 18:14:34 +0000
From: Andrew Cooper <andrew.cooper3@...rix.com>
To: LKML <linux-kernel@...r.kernel.org>
Cc: Andrew Cooper <andrew.cooper3@...rix.com>,
	Sohil Mehta <sohil.mehta@...el.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	Borislav Petkov <bp@...en8.de>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	x86@...nel.org,
	"H. Peter Anvin" <hpa@...or.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Yuntao Wang <yuntao.wang@...ux.dev>,
	Zhang Rui <rui.zhang@...el.com>
Subject: [PATCH v2] x86/apic: Drop useless CXL/CPX row from the TSC deadline errata table

This erratum is fixed in later steppings.

Instead of including the fixed steppings in the table in a way that will
unconditionally cause apic_validate_deadline_timer() to decide "not
vulnerable", simply omit the row.

No functional change.

Reviewed-by: Sohil Mehta <sohil.mehta@...el.com>
Signed-off-by: Andrew Cooper <andrew.cooper3@...rix.com>
---
CC: Thomas Gleixner <tglx@...utronix.de>
CC: Ingo Molnar <mingo@...hat.com>
CC: Borislav Petkov <bp@...en8.de>
CC: Dave Hansen <dave.hansen@...ux.intel.com>
CC: x86@...nel.org
CC: "H. Peter Anvin" <hpa@...or.com>
CC: Peter Zijlstra <peterz@...radead.org>
CC: Sohil Mehta <sohil.mehta@...el.com>
CC: Yuntao Wang <yuntao.wang@...ux.dev>
CC: Zhang Rui <rui.zhang@...el.com>
CC: linux-kernel@...r.kernel.org

v2:
 * Adjust the commit message.

Strictly speaking, this is:

  Fixes: 66abf2388331 ("x86/apic: Convert the TSC deadline timer matching to steppings macro")

but I really don't think it's interesting to backport.
---
 arch/x86/kernel/apic/apic.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c
index d93f87f29d03..829c8efce1c1 100644
--- a/arch/x86/kernel/apic/apic.c
+++ b/arch/x86/kernel/apic/apic.c
@@ -524,7 +524,6 @@ static const struct x86_cpu_id deadline_match[] __initconst = {
 
 	X86_MATCH_VFM_STEPS(INTEL_SKYLAKE_X,   0x3, 0x3, 0x01000136),
 	X86_MATCH_VFM_STEPS(INTEL_SKYLAKE_X,   0x4, 0x4, 0x02000014),
-	X86_MATCH_VFM_STEPS(INTEL_SKYLAKE_X,   0x5, 0xf, 0),
 
 	X86_MATCH_VFM(INTEL_HASWELL,		0x22),
 	X86_MATCH_VFM(INTEL_HASWELL_L,		0x20),

base-commit: 7f98ab9da046865d57c102fd3ca9669a29845f67
-- 
2.39.5