Commit b9b9d72d authored by Joey Gouly's avatar Joey Gouly Committed by Will Deacon
Browse files

arm64: add Permission Overlay Extension Kconfig 



Now that support for POE and Protection Keys has been implemented, add a
config to allow users to actually enable it.

Signed-off-by: default avatarJoey Gouly <joey.gouly@arm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will@kernel.org>
Reviewed-by: default avatarAnshuman Khandual <anshuman.khandual@arm.com>
Acked-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
Link: https://lore.kernel.org/r/20240822151113.1479789-24-joey.gouly@arm.com


Signed-off-by: default avatarWill Deacon <will@kernel.org>
parent 4afd0064

arch/arm64/Kconfig

+23 −0
Original line number Diff line number Diff line
@@ -2137,6 +2137,29 @@ config ARM64_EPAN 
	  if the cpu does not implement the feature.

endmenu # "ARMv8.7 architectural features"



menu "ARMv8.9 architectural features"



config ARM64_POE

	prompt "Permission Overlay Extension"

	def_bool y

	select ARCH_USES_HIGH_VMA_FLAGS

	select ARCH_HAS_PKEYS

	help

	  The Permission Overlay Extension is used to implement Memory

	  Protection Keys. Memory Protection Keys provides a mechanism for

	  enforcing page-based protections, but without requiring modification

	  of the page tables when an application changes protection domains.



	  For details, see Documentation/core-api/protection-keys.rst



	  If unsure, say y.



config ARCH_PKEY_BITS

	int

	default 3



endmenu # "ARMv8.9 architectural features"



config ARM64_SVE

	bool "ARM Scalable Vector Extension support"

	default y