linux-kernel - [PATCH v5 5/7] x86/boot: Drop USE_EARLY_PGTABLE

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Message-ID: <20250520104138.2734372-14-ardb+git@google.com>
Date: Tue, 20 May 2025 12:41:44 +0200
From: Ard Biesheuvel <ardb+git@...gle.com>
To: linux-kernel@...r.kernel.org
Cc: x86@...nel.org, Ard Biesheuvel <ardb@...nel.org>, Ingo Molnar <mingo@...nel.org>, 
	Linus Torvalds <torvalds@...ux-foundation.org>, Brian Gerst <brgerst@...il.com>, 
	"Kirill A. Shutemov" <kirill@...temov.name>, Borislav Petkov <bp@...en8.de>
Subject: [PATCH v5 5/7] x86/boot: Drop USE_EARLY_PGTABLE_L5 definitions

From: Ard Biesheuvel <ardb@...nel.org>

Drop USE_EARLY_PGTABLE_L5 definitions, which no longer have any effect.

Signed-off-by: Ard Biesheuvel <ardb@...nel.org>
---
 arch/x86/boot/compressed/misc.h | 3 ---
 arch/x86/boot/startup/sme.c     | 9 ---------
 arch/x86/kernel/cpu/common.c    | 3 ---
 arch/x86/kernel/head64.c        | 3 ---
 arch/x86/mm/kasan_init_64.c     | 3 ---
 5 files changed, 21 deletions(-)

diff --git a/arch/x86/boot/compressed/misc.h b/arch/x86/boot/compressed/misc.h
index 3157f2fbc593..7f79c426f542 100644
--- a/arch/x86/boot/compressed/misc.h
+++ b/arch/x86/boot/compressed/misc.h
@@ -16,9 +16,6 @@
 
 #define __NO_FORTIFY
 
-/* cpu_feature_enabled() cannot be used this early */
-#define USE_EARLY_PGTABLE_L5
-
 /*
  * Boot stub deals with identity mappings, physical and virtual addresses are
  * the same, so override these defines.
diff --git a/arch/x86/boot/startup/sme.c b/arch/x86/boot/startup/sme.c
index 70ea1748c0a7..a6c25d005991 100644
--- a/arch/x86/boot/startup/sme.c
+++ b/arch/x86/boot/startup/sme.c
@@ -25,15 +25,6 @@
 #undef CONFIG_PARAVIRT_XXL
 #undef CONFIG_PARAVIRT_SPINLOCKS
 
-/*
- * This code runs before CPU feature bits are set. By default, the
- * pgtable_l5_enabled() function uses bit X86_FEATURE_LA57 to determine if
- * 5-level paging is active, so that won't work here. USE_EARLY_PGTABLE_L5
- * is provided to handle this situation and, instead, use a variable that
- * has been set by the early boot code.
- */
-#define USE_EARLY_PGTABLE_L5
-
 #include <linux/kernel.h>
 #include <linux/mm.h>
 #include <linux/mem_encrypt.h>
diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
index 8feb8fd2957a..256613b24bd4 100644
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -1,7 +1,4 @@
 // SPDX-License-Identifier: GPL-2.0-only
-/* cpu_feature_enabled() cannot be used this early */
-#define USE_EARLY_PGTABLE_L5
-
 #include <linux/memblock.h>
 #include <linux/linkage.h>
 #include <linux/bitops.h>
diff --git a/arch/x86/kernel/head64.c b/arch/x86/kernel/head64.c
index fe0770f468c3..5e5da6574a83 100644
--- a/arch/x86/kernel/head64.c
+++ b/arch/x86/kernel/head64.c
@@ -5,9 +5,6 @@
  *  Copyright (C) 2000 Andrea Arcangeli <andrea@...e.de> SuSE
  */
 
-/* cpu_feature_enabled() cannot be used this early */
-#define USE_EARLY_PGTABLE_L5
-
 #include <linux/init.h>
 #include <linux/linkage.h>
 #include <linux/types.h>
diff --git a/arch/x86/mm/kasan_init_64.c b/arch/x86/mm/kasan_init_64.c
index 0539efd0d216..7c4fafbd52cc 100644
--- a/arch/x86/mm/kasan_init_64.c
+++ b/arch/x86/mm/kasan_init_64.c
@@ -1,9 +1,6 @@
 // SPDX-License-Identifier: GPL-2.0
 #define pr_fmt(fmt) "kasan: " fmt
 
-/* cpu_feature_enabled() cannot be used this early */
-#define USE_EARLY_PGTABLE_L5
-
 #include <linux/memblock.h>
 #include <linux/kasan.h>
 #include <linux/kdebug.h>
-- 
2.49.0.1101.gccaa498523-goog