[PATCH v12 1/7] arm64: Kconfig: add support for LSUI

Yeoreum Yun
2026-01-21T19:06:31Z

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}