[tip: x86/bugs] x86/Kconfig: Add arch attack vector support

["tip-bot2 for David Kaplan" <tip-bot2@linutronix.de>]

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

Commit-ID:     735e59204b5eb5aa55ba64be5d8ff4223b197816
Gitweb:        https://git.kernel.org/tip/735e59204b5eb5aa55ba64be5d8ff4223b197816
Author:        David Kaplan <david.kaplan@amd.com>
AuthorDate:    Mon, 07 Jul 2025 13:32:58 -05:00
Committer:     Borislav Petkov (AMD) <bp@alien8.de>
CommitterDate: Fri, 11 Jul 2025 17:56:40 +02:00

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@amd.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/20250707183316.1349127-4-david.kaplan@amd.com
---
 arch/Kconfig     | 3 +++
 arch/x86/Kconfig | 1 +
 2 files changed, 4 insertions(+)

diff --git a/arch/Kconfig b/arch/Kconfig
index a3308a2..7d8a4e7 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -1763,4 +1763,7 @@ 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 71dfe7d..6c20adb 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -75,6 +75,7 @@ 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