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>
---
 arch/arm64/Kconfig | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 93173f0a09c7..af70778e966c 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -2227,6 +2227,26 @@ 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}

On Wed, Jan 21, 2026 at 07:06:16PM +0000, Yeoreum Yun wrote:
> 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>

In general we should move the Kconfig addition last for bisectability,
unless all the other patches introduced are ok on their own.

-- 
Catalin