linux-kernel - [PATCH v5 03/20] x86/Kconfig: Add arch attack vector support

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Message-ID: <20250509162839.3057217-4-david.kaplan@amd.com>
Date: Fri, 9 May 2025 11:28:22 -0500
From: David Kaplan <david.kaplan@....com>
To: Thomas Gleixner <tglx@...utronix.de>, Borislav Petkov <bp@...en8.de>,
	Peter Zijlstra <peterz@...radead.org>, Josh Poimboeuf <jpoimboe@...nel.org>,
	Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>, Ingo Molnar
	<mingo@...hat.com>, Dave Hansen <dave.hansen@...ux.intel.com>,
	<x86@...nel.org>, "H . Peter Anvin" <hpa@...or.com>
CC: <linux-kernel@...r.kernel.org>
Subject: [PATCH v5 03/20] x86/Kconfig: Add arch attack vector support

ARCH_HAS_CPU_ATTACK_VECTORS should be set for architectures which implement
the new attack-vector based controls for CPU mitigations.  If an arch does
not support attack-vector based controls then an attempt to use them
results in a warning.

Signed-off-by: David Kaplan <david.kaplan@....com>
---
 arch/Kconfig     | 3 +++
 arch/x86/Kconfig | 1 +
 2 files changed, 4 insertions(+)

diff --git a/arch/Kconfig b/arch/Kconfig
index b0adb665041f..a900f7a5baae 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -1755,4 +1755,7 @@ config ARCH_WANTS_PRE_LINK_VMLINUX
 	  An architecture can select this if it provides arch/<arch>/tools/Makefile
 	  with .arch.vmlinux.o target to be linked into vmlinux.
 
+config ARCH_HAS_CPU_ATTACK_VECTORS
+	bool
+
 endmenu
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 4c33c644b92d..af6350f056ae 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -74,6 +74,7 @@ config X86
 	select ARCH_ENABLE_SPLIT_PMD_PTLOCK if (PGTABLE_LEVELS > 2) && (X86_64 || X86_PAE)
 	select ARCH_ENABLE_THP_MIGRATION if X86_64 && TRANSPARENT_HUGEPAGE
 	select ARCH_HAS_ACPI_TABLE_UPGRADE	if ACPI
+	select ARCH_HAS_CPU_ATTACK_VECTORS	if CPU_MITIGATIONS
 	select ARCH_HAS_CACHE_LINE_SIZE
 	select ARCH_HAS_CPU_CACHE_INVALIDATE_MEMREGION
 	select ARCH_HAS_CPU_FINALIZE_INIT
-- 
2.34.1