Commit 89b94df9 authored by Vincenzo Frascino's avatar Vincenzo Frascino Committed by Catalin Marinas
Browse files

arm64: mte: Kconfig entry 



Add Memory Tagging Extension support to the arm64 kbuild.

Signed-off-by: default avatarVincenzo Frascino <vincenzo.frascino@arm.com>
Co-developed-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
Signed-off-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will@kernel.org>
parent ee11f332

arch/arm64/Kconfig

+33 −0
Original line number Diff line number Diff line
@@ -1664,6 +1664,39 @@ config ARCH_RANDOM 
	  provides a high bandwidth, cryptographically secure

	  hardware random number generator.



config ARM64_AS_HAS_MTE

	# Initial support for MTE went in binutils 2.32.0, checked with

	# ".arch armv8.5-a+memtag" below. However, this was incomplete

	# as a late addition to the final architecture spec (LDGM/STGM)

	# is only supported in the newer 2.32.x and 2.33 binutils

	# versions, hence the extra "stgm" instruction check below.

	def_bool $(as-instr,.arch armv8.5-a+memtag\nstgm xzr$(comma)[x0])



config ARM64_MTE

	bool "Memory Tagging Extension support"

	default y

	depends on ARM64_AS_HAS_MTE && ARM64_TAGGED_ADDR_ABI

	select ARCH_USES_HIGH_VMA_FLAGS

	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

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