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Message-Id: <20250722121956.1509403-1-yeoreum.yun@arm.com>
Date: Tue, 22 Jul 2025 13:19:51 +0100
From: Yeoreum Yun <yeoreum.yun@....com>
To: catalin.marinas@....com,
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Cc: linux-arm-kernel@...ts.infradead.org,
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Yeoreum Yun <yeoreum.yun@....com>
Subject: [PATCH v5 0/5] support FEAT_LSUI and apply it on futex atomic ops
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 in futex atomic operation
where can replace from ldxr/stlxr pair implmentation with clearing
PSTATE.PAN bit to correspondant load/store unprevileged atomic operation
without clearing PSTATE.PAN bit.
Patch Sequences
================
Patch #1 adds cpufeature for FEAT_LSUI
Patch #2 expose FEAT_LSUI to guest
Patch #3 adds Kconfig for FEAT_LSUI
Patch #4 refactor former futex atomic-op implmentation with ll/sc &
clearing PSTATE.PAN
Patch #5 support futext atomic-op with FEAT_LSUI
Patch History
==============
from v4 to v5:
- remove futex_ll_sc.h futext_lsui and lsui.h and move them to futex.h
- reorganize the patches.
- https://lore.kernel.org/all/20250721083618.2743569-1-yeoreum.yun@arm.com/
from v3 to v4:
- rebase to v6.16-rc7
- modify some patch's title.
- https://lore.kernel.org/all/20250617183635.1266015-1-yeoreum.yun@arm.com/
from v2 to v3:
- expose FEAT_LUSI to guest
- add help section for LUSI Kconfig
- https://lore.kernel.org/all/20250611151154.46362-1-yeoreum.yun@arm.com/
from v1 to v2:
- remove empty v9.6 menu entry
- locate HAS_LUSI in cpucaps in order
- https://lore.kernel.org/all/20250611104916.10636-1-yeoreum.yun@arm.com/
Yeoreum Yun (5):
arm64: cpufeature: add FEAT_LSUI
KVM: arm64: expose FEAT_LSUI to guest
arm64: Kconfig: add LSUI Kconfig
arm64: futex: refactor futex atomic operation
arm64: futex: support futex with FEAT_LSUI
arch/arm64/Kconfig | 5 +
arch/arm64/include/asm/futex.h | 323 +++++++++++++++++++++++++++------
arch/arm64/kernel/cpufeature.c | 8 +
arch/arm64/kvm/sys_regs.c | 5 +-
arch/arm64/tools/cpucaps | 1 +
5 files changed, 281 insertions(+), 61 deletions(-)
--
LEVI:{C3F47F37-75D8-414A-A8BA-3980EC8A46D7}
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