Changes in lsui.h

c43267e6794a36013fd495a4d81bf7f748fe4615 - Merge tag 'arm64-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux

Tue, 14 Apr 2026 23:48:56 +0000

Merge tag 'arm64-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linuxPull arm64 updates from Catalin Marinas: "The biggest changes are MPAM enablement in drivers/resctrl and new PMU support under drivers/perf. On the core side, FEAT_LSUI lets futex atomic operations with EL0 permissions, avoiding PAN toggling. The rest is mostly TLB invalidation refactoring, further generic entry work, sysreg updates and a few fixes. Core features: - Add support for FEAT_LSUI, allowing futex atomic operations without toggling Privileged Access Never (PAN) - Further refactor the arm64 exception handling code towards the generic entry infrastructure - Optimise __READ_ONCE() with CONFIG_LTO=y and allow alias analysis through it Memory management: - Refactor the arm64 TLB invalidation API and implementation for better control over barrier placement and level-hinted invalidation - Enable batched TLB flushes during memory hot-unplug - Fix rodata=full block mapping support for realm guests (when BBML2_NOABORT is available) Perf and PMU: - Add support for a whole bunch of system PMUs featured in NVIDIA's Tegra410 SoC (cspmu extensions for the fabric and PCIe, new drivers for CPU/C2C memory latency PMUs) - Clean up iomem resource handling in the Arm CMN driver - Fix signedness handling of AA64DFR0.{PMUVer,PerfMon} MPAM (Memory Partitioning And Monitoring): - Add architecture context-switch and hiding of the feature from KVM - Add interface to allow MPAM to be exposed to user-space using resctrl - Add errata workaround for some existing platforms - Add documentation for using MPAM and what shape of platforms can use resctrl Miscellaneous: - Check DAIF (and PMR, where relevant) at task-switch time - Skip TFSR_EL1 checks and barriers in synchronous MTE tag check mode (only relevant to asynchronous or asymmetric tag check modes) - Remove a duplicate allocation in the kexec code - Remove redundant save/restore of SCS SP on entry to/from EL0 - Generate the KERNEL_HWCAP_ definitions from the arm64 hwcap descriptions - Add kselftest coverage for cmpbr_sigill() - Update sysreg definitions"* tag 'arm64-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux: (109 commits) arm64: rsi: use linear-map alias for realm config buffer arm64: Kconfig: fix duplicate word in CMDLINE help text arm64: mte: Skip TFSR_EL1 checks and barriers in synchronous tag check mode arm64/sysreg: Update ID_AA64SMFR0_EL1 description to DDI0601 2025-12 arm64/sysreg: Update ID_AA64ZFR0_EL1 description to DDI0601 2025-12 arm64/sysreg: Update ID_AA64FPFR0_EL1 description to DDI0601 2025-12 arm64/sysreg: Update ID_AA64ISAR2_EL1 description to DDI0601 2025-12 arm64/sysreg: Update ID_AA64ISAR0_EL1 description to DDI0601 2025-12 arm64/hwcap: Generate the KERNEL_HWCAP_ definitions for the hwcaps arm64: kexec: Remove duplicate allocation for trans_pgd ACPI: AGDI: fix missing newline in error message arm64: Check DAIF (and PMR) at task-switch time arm64: entry: Use split preemption logic arm64: entry: Use irqentry_{enter_from,exit_to}_kernel_mode() arm64: entry: Consistently prefix arm64-specific wrappers arm64: entry: Don't preempt with SError or Debug masked entry: Split preemption from irqentry_exit_to_kernel_mode() entry: Split kernel mode logic from irqentry_{enter,exit}() entry: Move irqentry_enter() prototype later entry: Remove local_irq_{enable,disable}_exit_to_user() ... List of files: /linux/arch/arm64/include/asm/lsui.h

480a9e57cceaf42db6ff874dbfe91de201935035 - Merge branches 'for-next/misc', 'for-next/tlbflush', 'for-next/ttbr-macros-cleanup', 'for-next/kselftest', 'for-next/feat_lsui', 'for-next/mpam', 'for-next/hotplug-batched-tlbi', 'for-next/bbml2-fixes', 'for-next/sysreg', 'for-next/generic-entry' and 'for-next/acpi', remote-tracking branches 'arm64/for-next/perf' and 'arm64/for-next/read-once' into for-next/core

Fri, 10 Apr 2026 13:22:24 +0000

Merge branches 'for-next/misc', 'for-next/tlbflush', 'for-next/ttbr-macros-cleanup', 'for-next/kselftest', 'for-next/feat_lsui', 'for-next/mpam', 'for-next/hotplug-batched-tlbi', 'for-next/bbml2-fixes', 'for-next/sysreg', 'for-next/generic-entry' and 'for-next/acpi', remote-tracking branches 'arm64/for-next/perf' and 'arm64/for-next/read-once' into for-next/core* arm64/for-next/perf: : Perf updates perf/arm-cmn: Fix resource_size_t printk specifier in arm_cmn_init_dtc() perf/arm-cmn: Fix incorrect error check for devm_ioremap() perf: add NVIDIA Tegra410 C2C PMU perf: add NVIDIA Tegra410 CPU Memory Latency PMU perf/arm_cspmu: nvidia: Add Tegra410 PCIE-TGT PMU perf/arm_cspmu: nvidia: Add Tegra410 PCIE PMU perf/arm_cspmu: Add arm_cspmu_acpi_dev_get perf/arm_cspmu: nvidia: Add Tegra410 UCF PMU perf/arm_cspmu: nvidia: Rename doc to Tegra241 perf/arm-cmn: Stop claiming entire iomem region arm64: cpufeature: Use pmuv3_implemented() function arm64: cpufeature: Make PMUVer and PerfMon unsigned KVM: arm64: Read PMUVer as unsigned* arm64/for-next/read-once: : Fixes for __READ_ONCE() with CONFIG_LTO=y arm64, compiler-context-analysis: Permit alias analysis through __READ_ONCE() with CONFIG_LTO=y arm64: Optimize __READ_ONCE() with CONFIG_LTO=y* for-next/misc: : Miscellaneous cleanups/fixes arm64: rsi: use linear-map alias for realm config buffer arm64: Kconfig: fix duplicate word in CMDLINE help text arm64: mte: Skip TFSR_EL1 checks and barriers in synchronous tag check mode arm64/hwcap: Generate the KERNEL_HWCAP_ definitions for the hwcaps arm64: kexec: Remove duplicate allocation for trans_pgd arm64: mm: Use generic enum pgtable_level arm64: scs: Remove redundant save/restore of SCS SP on entry to/from EL0 arm64: remove ARCH_INLINE_** for-next/tlbflush: : Refactor the arm64 TLB invalidation API and implementation arm64: mm: __ptep_set_access_flags must hint correct TTL arm64: mm: Provide level hint for flush_tlb_page() arm64: mm: Wrap flush_tlb_page() around __do_flush_tlb_range() arm64: mm: More flags for __flush_tlb_range() arm64: mm: Refactor __flush_tlb_range() to take flags arm64: mm: Refactor flush_tlb_page() to use __tlbi_level_asid() arm64: mm: Simplify __flush_tlb_range_limit_excess() arm64: mm: Simplify __TLBI_RANGE_NUM() macro arm64: mm: Re-implement the __flush_tlb_range_op macro in C arm64: mm: Inline __TLBI_VADDR_RANGE() into __tlbi_range() arm64: mm: Push __TLBI_VADDR() into __tlbi_level() arm64: mm: Implicitly invalidate user ASID based on TLBI operation arm64: mm: Introduce a C wrapper for by-range TLB invalidation arm64: mm: Re-implement the __tlbi_level macro as a C function* for-next/ttbr-macros-cleanup: : Cleanups of the TTBR1_* macros arm64/mm: Directly use TTBRx_EL1_CnP arm64/mm: Directly use TTBRx_EL1_ASID_MASK arm64/mm: Describe TTBR1_BADDR_4852_OFFSET* for-next/kselftest: : arm64 kselftest updates selftests/arm64: Implement cmpbr_sigill() to hwcap test* for-next/feat_lsui: : Futex support using FEAT_LSUI instructions to avoid toggling PAN arm64: armv8_deprecated: Disable swp emulation when FEAT_LSUI present arm64: Kconfig: Add support for LSUI KVM: arm64: Use CAST instruction for swapping guest descriptor arm64: futex: Support futex with FEAT_LSUI arm64: futex: Refactor futex atomic operation KVM: arm64: kselftest: set_id_regs: Add test for FEAT_LSUI KVM: arm64: Expose FEAT_LSUI to guests arm64: cpufeature: Add FEAT_LSUI* for-next/mpam: (40 commits) : Expose MPAM to user-space via resctrl: : - Add architecture context-switch and hiding of the feature from KVM. : - Add interface to allow MPAM to be exposed to user-space using resctrl. : - Add errata workaoround for some existing platforms. : - Add documentation for using MPAM and what shape of platforms can use resctrl arm64: mpam: Add initial MPAM documentation arm_mpam: Quirk CMN-650's CSU NRDY behaviour arm_mpam: Add workaround for T241-MPAM-6 arm_mpam: Add workaround for T241-MPAM-4 arm_mpam: Add workaround for T241-MPAM-1 arm_mpam: Add quirk framework arm_mpam: resctrl: Call resctrl_init() on platforms that can support resctrl arm64: mpam: Select ARCH_HAS_CPU_RESCTRL arm_mpam: resctrl: Add empty definitions for assorted resctrl functions arm_mpam: resctrl: Update the rmid reallocation limit arm_mpam: resctrl: Add resctrl_arch_rmid_read() arm_mpam: resctrl: Allow resctrl to allocate monitors arm_mpam: resctrl: Add support for csu counters arm_mpam: resctrl: Add monitor initialisation and domain boilerplate arm_mpam: resctrl: Add kunit test for control format conversions arm_mpam: resctrl: Add support for 'MB' resource arm_mpam: resctrl: Wait for cacheinfo to be ready arm_mpam: resctrl: Add rmid index helpers arm_mpam: resctrl: Convert to/from MPAMs fixed-point formats arm_mpam: resctrl: Hide CDP emulation behind CONFIG_EXPERT ...* for-next/hotplug-batched-tlbi: : arm64/mm: Enable batched TLB flush in unmap_hotplug_range() arm64/mm: Reject memory removal that splits a kernel leaf mapping arm64/mm: Enable batched TLB flush in unmap_hotplug_range()* for-next/bbml2-fixes: : Fixes for realm guest and BBML2_NOABORT arm64: mm: Remove pmd_sect() and pud_sect() arm64: mm: Handle invalid large leaf mappings correctly arm64: mm: Fix rodata=full block mapping support for realm guests* for-next/sysreg: : arm64 sysreg updates arm64/sysreg: Update ID_AA64SMFR0_EL1 description to DDI0601 2025-12 arm64/sysreg: Update ID_AA64ZFR0_EL1 description to DDI0601 2025-12 arm64/sysreg: Update ID_AA64FPFR0_EL1 description to DDI0601 2025-12 arm64/sysreg: Update ID_AA64ISAR2_EL1 description to DDI0601 2025-12 arm64/sysreg: Update ID_AA64ISAR0_EL1 description to DDI0601 2025-12 arm64/sysreg: Update SMIDR_EL1 to DDI0601 2025-06* for-next/generic-entry: : More arm64 refactoring towards using the generic entry code arm64: Check DAIF (and PMR) at task-switch time arm64: entry: Use split preemption logic arm64: entry: Use irqentry_{enter_from,exit_to}_kernel_mode() arm64: entry: Consistently prefix arm64-specific wrappers arm64: entry: Don't preempt with SError or Debug masked entry: Split preemption from irqentry_exit_to_kernel_mode() entry: Split kernel mode logic from irqentry_{enter,exit}() entry: Move irqentry_enter() prototype later entry: Remove local_irq_{enable,disable}_exit_to_user() entry: Fix stale comment for irqentry_enter()* for-next/acpi: : arm64 ACPI updates ACPI: AGDI: fix missing newline in error message List of files: /linux/arch/arm64/include/asm/lsui.h

44adf2bf40efe56c68c1563779ab2047eb0a57ea - arm64: futex: Support futex with FEAT_LSUI

Sat, 14 Mar 2026 17:51:30 +0000

arm64: futex: Support futex with FEAT_LSUICurrent futex atomic operations are implemented using LL/SC instructionswhile temporarily clearing PSTATE.PAN and setting PSTATE.TCO (ifKASAN_HW_TAGS is enabled). With Armv9.6, FEAT_LSUI provides atomicinstructions for user memory access in the kernel without the need forPSTATE bits toggling.Use the FEAT_LSUI instructions to implement the futex atomic operations.Note that some futex operations do not have a matching LSUI instruction,(eor or word-sized cmpxchg). For such cases, use cas{al}t to implementthe operation.Signed-off-by: Yeoreum Yun [catalin.marinas@arm.com: add comment on -EAGAIN in __lsui_futex_cmpxchg()]Signed-off-by: Catalin Marinas List of files: /linux/arch/arm64/include/asm/lsui.h