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

diff --git a/arch/Kconfig b/arch/Kconfig
index a3308a220f86413085cdd101611b689078b998be..7d8a4e7066a6ca91d7b536e705319b0d46e4e5cc 100644 (file)
--- 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 71dfe7d7c786e0c7ccef54c202662605c097341a..6c20adb0fe7c3561cb38d576f8fb4509db93e965 100644 (file)
--- 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