linux-kernel - [PATCH 2/6] arm64/Kconfig: add LSUI Kconfig

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Message-Id: <20250611104916.10636-3-yeoreum.yun@arm.com>
Date: Wed, 11 Jun 2025 11:49:12 +0100
From: Yeoreum Yun <yeoreum.yun@....com>
To: catalin.marinas@....com,
	will@...nel.org,
	broonie@...nel.org,
	maz@...nel.org,
	oliver.upton@...ux.dev,
	ardb@...nel.org,
	frederic@...nel.org,
	james.morse@....com,
	joey.gouly@....com,
	scott@...amperecomputing.com
Cc: linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	Yeoreum Yun <yeoreum.yun@....com>
Subject: [PATCH 2/6] arm64/Kconfig: add LSUI Kconfig

Since Armv9.6, FEAT_LSUI supplies the load/store instructions for
previleged level to access to access user memory without clearing
PSTATE.PAN bit.
It's enough to add CONFIG_AS_HAS_LSUI only because the code for LUSI uses
indiviual `.arch_extension` entries.

Signed-off-by: Yeoreum Yun <yeoreum.yun@....com>
---
 arch/arm64/Kconfig | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 55fc331af337..20f360eef2ac 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -2237,6 +2237,13 @@ config ARM64_GCS
 
 endmenu # "v9.4 architectural features"
 
+menu "v9.6 architectural features"
+
+config AS_HAS_LSUI
+	def_bool $(as-instr,.arch_extension lsui)
+
+endmenu # "v9.6 architectural features"
+
 config ARM64_SVE
 	bool "ARM Scalable Vector Extension support"
 	default y
@@ -2498,4 +2505,3 @@ endmenu # "CPU Power Management"
 source "drivers/acpi/Kconfig"
 
 source "arch/arm64/kvm/Kconfig"
-
-- 
LEVI:{C3F47F37-75D8-414A-A8BA-3980EC8A46D7}