提交 89b94df9 编写于 作者: V Vincenzo Frascino 提交者: Catalin Marinas

arm64: mte: Kconfig entry

Add Memory Tagging Extension support to the arm64 kbuild.
Signed-off-by: NVincenzo Frascino <vincenzo.frascino@arm.com>
Co-developed-by: NCatalin Marinas <catalin.marinas@arm.com>
Signed-off-by: NCatalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will@kernel.org>
上级 ee11f332
...@@ -1664,6 +1664,39 @@ config ARCH_RANDOM ...@@ -1664,6 +1664,39 @@ config ARCH_RANDOM
provides a high bandwidth, cryptographically secure provides a high bandwidth, cryptographically secure
hardware random number generator. 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 endmenu
config ARM64_SVE config ARM64_SVE
......
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