From: Vincenzo Frascino <vincenzo.frascino@xxxxxxx> Add Memory Tagging Extension support to the arm64 kbuild. Signed-off-by: Vincenzo Frascino <vincenzo.frascino@xxxxxxx> Co-developed-by: Catalin Marinas <catalin.marinas@xxxxxxx> Signed-off-by: Catalin Marinas <catalin.marinas@xxxxxxx> --- arch/arm64/Kconfig | 32 ++++++++++++++++++++++++++++++++ 1 file changed, 32 insertions(+) diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index 0b30e884e088..ed20f5b0e122 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -1541,6 +1541,38 @@ config ARCH_RANDOM endmenu +menu "ARMv8.5 architectural features" + +config ARM64_AS_HAS_MTE + def_bool $(as-instr,.arch armv8.5-a+memtag) + +config ARM64_MTE + bool "Memory Tagging Extension support" + depends on ARM64_AS_HAS_MTE && ARM64_TAGGED_ADDR_ABI + select ARCH_USES_HIGH_VMA_FLAGS + select ARCH_NO_SWAP + help + Memory Tagging (part of the ARMv8.5 Extensions) provides + architectural support for run-time, always-on detection of + various classes of memory error to aid with software debugging + to eliminate vulnerabilities arising from memory-unsafe + languages. + + This option enables the support for the Memory Tagging + Extension at EL0 (i.e. for userspace). + + Selecting this option allows the feature to be detected at + runtime. Any secondary CPU not implementing this feature will + not be allowed a late bring-up. + + Userspace binaries that want to use this feature must + explicitly opt in. The mechanism for the userspace is + described in: + + Documentation/arm64/memory-tagging-extension.rst. + +endmenu + config ARM64_SVE bool "ARM Scalable Vector Extension support" default y
