[PATCH v13 8/8] arm64: Kconfig: add support for LSUI

[Yeoreum Yun <yeoreum.yun@arm.com>]

Since Armv9.6, FEAT_LSUI supplies the load/store instructions for
previleged level to access to access user memory without clearing
PSTATE.PAN bit.

Add Kconfig option entry for FEAT_LSUI.

Signed-off-by: Yeoreum Yun <yeoreum.yun@arm.com>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
---
 arch/arm64/Kconfig | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 38dba5f7e4d2..890a1bedbf4a 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -2215,6 +2215,26 @@ config ARM64_GCS
 
 endmenu # "ARMv9.4 architectural features"
 
+config AS_HAS_LSUI
+	def_bool $(as-instr,.arch_extension lsui)
+	help
+	  Supported by LLVM 20+ and binutils 2.45+.
+
+menu "ARMv9.6 architectural features"
+
+config ARM64_LSUI
+	bool "Support Unprivileged Load Store Instructions (LSUI)"
+	default y
+	depends on AS_HAS_LSUI && !CPU_BIG_ENDIAN
+	help
+	  The Unprivileged Load Store Instructions (LSUI) provides
+	  variants load/store instructions that access user-space memory
+	  from the kernel without clearing PSTATE.PAN bit.
+
+	  This feature is supported by LLVM 20+ and binutils 2.45+.
+
+endmenu # "ARMv9.6 architectural feature"
+
 config ARM64_SVE
 	bool "ARM Scalable Vector Extension support"
 	default y
-- 
LEVI:{C3F47F37-75D8-414A-A8BA-3980EC8A46D7}