On Sat, 14 Mar 2026 17:51:25 +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.
>
> This patchset support FEAT_LSUI and applies it mainly in
> futex atomic operation and others.
>
> [...]
Applied to arm64 (for-next/feat_lsui), thanks!
I decided to drop patch [6/8] (arm64: armv8_deprecated: disable swp
emulation when FEAT_LSUI present). The way FEAT_LSUI support looks now,
we still have uaccess_enable_privileged() working properly and we could
even support SWP emulation using exclusives. While it's highly unlikely
to see both 32-bit EL0 and FEAT_LSUI in practice, models may support the
combination and disabling SWP emulation feels pretty artificial.
[1/8] arm64: cpufeature: add FEAT_LSUI
https://git.kernel.org/arm64/c/7181f718cb0f
[2/8] KVM: arm64: expose FEAT_LSUI to guest
https://git.kernel.org/arm64/c/f6bff18d05ed
[3/8] KVM: arm64: kselftest: set_id_regs: add test for FEAT_LSUI
https://git.kernel.org/arm64/c/42550d7d8aa6
[4/8] arm64: futex: refactor futex atomic operation
https://git.kernel.org/arm64/c/eaa3babcceaa
[5/8] arm64: futex: support futex with FEAT_LSUI
https://git.kernel.org/arm64/c/44adf2bf40ef
[7/8] KVM: arm64: use CAST instruction for swapping guest descriptor
https://git.kernel.org/arm64/c/16dbe77a5be2
[8/8] arm64: Kconfig: add support for LSUI
https://git.kernel.org/arm64/c/377609ae8b6a
--
Catalin
