[PATCH V2 13/14] arm64/mm: Make ARM64_D128 selectable
From: Anshuman Khandual <hidden>
Date: 2026-09-07 03:54:04
Also in:
linux-mm, lkml
Subsystem:
arm64 port (aarch64 architecture), the rest · Maintainers:
Catalin Marinas, Will Deacon, Linus Torvalds
All required changes are already in place including the TLBIP instruction support for enabling D128 translation. Just make this new ARM64_D128 user selectable, after ensuring necessary tools chain support required for the new instructions being used for D128. Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Will Deacon <will@kernel.org> Cc: Ryan Roberts <ryan.roberts@arm.com> Cc: Mark Rutland <mark.rutland@arm.com> Cc: linux-arm-kernel@lists.infradead.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Anshuman Khandual <redacted> --- Changes in V2: - Dropped !KASAN dependency from ARM64_D128 arch/arm64/Kconfig | 15 ++++++++++++++- 1 file changed, 14 insertions(+), 1 deletion(-)
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 306e6c803471..483eb6d75c7a 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig@@ -276,6 +276,10 @@ config GCC_SUPPORTS_DYNAMIC_FTRACE_WITH_ARGS def_bool CC_IS_GCC depends on $(cc-option,-fpatchable-function-entry=2) +config CC_SUPPORTS_LSE128 + def_bool CC_IS_GCC + depends on $(cc-option, -march=armv8.1-a+lse128) + config 64BIT def_bool y
@@ -2305,8 +2309,17 @@ endmenu # "ARMv8.9 architectural features" menu "ARMv9.3 architectural features" +config AS_HAS_ARMV9_3 + def_bool $(cc-option,-Wa$(comma)-march=armv9.3-a) + config ARM64_D128 - bool + bool "Enable support for 128 bit page table (FEAT_D128)" + depends on ARCH_SUPPORTS_INT128 + depends on CC_SUPPORTS_LSE128 + depends on AS_HAS_ARMV9_3 + depends on EXPERT + depends on !VIRTUALIZATION + depends on !UNMAP_KERNEL_AT_EL0 default n help ARMv9.3 introduces FEAT_D128, which provides a 128 bit page
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2.43.0