linux-kernel - [tip: x86/cpu] x86/mm/pat: Replace Intel x86

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Message-ID: <174232406675.14745.16839508278274331287.tip-bot2@tip-bot2>
Date: Tue, 18 Mar 2025 18:54:26 -0000
From: "tip-bot2 for Sohil Mehta" <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc: Sohil Mehta <sohil.mehta@...el.com>, Ingo Molnar <mingo@...nel.org>,
 Andy Lutomirski <luto@...nel.org>, Peter Zijlstra <peterz@...radead.org>,
 Rik van Riel <riel@...riel.com>, Borislav Petkov <bp@...en8.de>,
 "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
 linux-kernel@...r.kernel.org
Subject:
 [tip: x86/cpu] x86/mm/pat: Replace Intel x86_model checks with VFM ones

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

Commit-ID:     aa3e8239d8a2aa4dce2750968964afb5cdd424f8
Gitweb:        https://git.kernel.org/tip/aa3e8239d8a2aa4dce2750968964afb5cdd424f8
Author:        Sohil Mehta <sohil.mehta@...el.com>
AuthorDate:    Wed, 19 Feb 2025 18:41:30 
Committer:     Ingo Molnar <mingo@...nel.org>
CommitterDate: Tue, 18 Mar 2025 19:33:47 +01:00

x86/mm/pat: Replace Intel x86_model checks with VFM ones

Introduce markers and names for some Family 6 and Family 15 models and
replace x86_model checks with VFM ones.

Since the VFM checks are closed ended and only applicable to Intel, get
rid of the explicit Intel vendor check as well.

Signed-off-by: Sohil Mehta <sohil.mehta@...el.com>
Signed-off-by: Ingo Molnar <mingo@...nel.org>
Cc: Andy Lutomirski <luto@...nel.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Rik van Riel <riel@...riel.com>
Cc: Borislav Petkov <bp@...en8.de>
Cc: "H. Peter Anvin" <hpa@...or.com>
Link: https://lore.kernel.org/r/20250219184133.816753-13-sohil.mehta@intel.com
---
 arch/x86/include/asm/intel-family.h | 1 +
 arch/x86/mm/pat/memtype.c           | 6 +++---
 2 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/arch/x86/include/asm/intel-family.h b/arch/x86/include/asm/intel-family.h
index 51ea366..6cd08da 100644
--- a/arch/x86/include/asm/intel-family.h
+++ b/arch/x86/include/asm/intel-family.h
@@ -193,6 +193,7 @@
 /* Family 15 - NetBurst */
 #define INTEL_P4_WILLAMETTE		IFM(15, 0x01) /* Also Xeon Foster */
 #define INTEL_P4_PRESCOTT		IFM(15, 0x03)
+#define INTEL_P4_CEDARMILL		IFM(15, 0x06) /* Also Xeon Dempsey */
 
 /* Family 19 */
 #define INTEL_PANTHERCOVE_X		IFM(19, 0x01) /* Diamond Rapids */
diff --git a/arch/x86/mm/pat/memtype.c b/arch/x86/mm/pat/memtype.c
index 3a9e6dd..fff9617 100644
--- a/arch/x86/mm/pat/memtype.c
+++ b/arch/x86/mm/pat/memtype.c
@@ -43,6 +43,7 @@
 #include <linux/fs.h>
 #include <linux/rbtree.h>
 
+#include <asm/cpu_device_id.h>
 #include <asm/cacheflush.h>
 #include <asm/cacheinfo.h>
 #include <asm/processor.h>
@@ -290,9 +291,8 @@ void __init pat_bp_init(void)
 		return;
 	}
 
-	if ((c->x86_vendor == X86_VENDOR_INTEL) &&
-	    (((c->x86 == 0x6) && (c->x86_model <= 0xd)) ||
-	     ((c->x86 == 0xf) && (c->x86_model <= 0x6)))) {
+	if ((c->x86_vfm >= INTEL_PENTIUM_PRO   && c->x86_vfm <= INTEL_PENTIUM_M_DOTHAN) ||
+	    (c->x86_vfm >= INTEL_P4_WILLAMETTE && c->x86_vfm <= INTEL_P4_CEDARMILL)) {
 		/*
 		 * PAT support with the lower four entries. Intel Pentium 2,
 		 * 3, M, and 4 are affected by PAT errata, which makes the