diff mbox series

[v2,18/19] arm64: mte: Kconfig entry

Message ID 20200226180526.3272848-19-catalin.marinas@arm.com (mailing list archive)
State New, archived
Headers show
Series arm64: Memory Tagging Extension user-space support | expand

Commit Message

Catalin Marinas Feb. 26, 2020, 6:05 p.m. UTC 
From: Vincenzo Frascino <vincenzo.frascino@arm.com>

Add Memory Tagging Extension support to the arm64 kbuild.

Signed-off-by: Vincenzo Frascino <vincenzo.frascino@arm.com>
Co-developed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
---
 arch/arm64/Kconfig | 32 ++++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)
diff mbox series

Patch

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