linux/arch/arm64/kernel/probes, branch master

Merge tag 'perf-core-2026-02-09' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2026-02-10T20:00:46Z

Pull performance event updates from Ingo Molnar: "x86 PMU driver updates: - Add support for the core PMU for Intel Diamond Rapids (DMR) CPUs (Dapeng Mi) Compared to previous iterations of the Intel PMU code, there's been a lot of changes, which center around three main areas: - Introduce the OFF-MODULE RESPONSE (OMR) facility to replace the Off-Core Response (OCR) facility - New PEBS data source encoding layout - Support the new "RDPMC user disable" feature - Likewise, a large series adds uncore PMU support for Intel Diamond Rapids (DMR) CPUs (Zide Chen) This centers around these four main areas: - DMR may have two Integrated I/O and Memory Hub (IMH) dies, separate from the compute tile (CBB) dies. Each CBB and each IMH die has its own discovery domain. - Unlike prior CPUs that retrieve the global discovery table portal exclusively via PCI or MSR, DMR uses PCI for IMH PMON discovery and MSR for CBB PMON discovery. - DMR introduces several new PMON types: SCA, HAMVF, D2D_ULA, UBR, PCIE4, CRS, CPC, ITC, OTC, CMS, and PCIE6. - IIO free-running counters in DMR are MMIO-based, unlike SPR. - Also add support for Add missing PMON units for Intel Panther Lake, and support Nova Lake (NVL), which largely maps to Panther Lake. (Zide Chen) - KVM integration: Add support for mediated vPMUs (by Kan Liang and Sean Christopherson, with fixes and cleanups by Peter Zijlstra, Sandipan Das and Mingwei Zhang) - Add Intel cstate driver to support for Wildcat Lake (WCL) CPUs, which are a low-power variant of Panther Lake (Zide Chen) - Add core, cstate and MSR PMU support for the Airmont NP Intel CPU (aka MaxLinear Lightning Mountain), which maps to the existing Airmont code (Martin Schiller) Performance enhancements: - Speed up kexec shutdown by avoiding unnecessary cross CPU calls (Jan H. Schönherr) - Fix slow perf_event_task_exit() with LBR callstacks (Namhyung Kim) User-space stack unwinding support: - Various cleanups and refactorings in preparation to generalize the unwinding code for other architectures (Jens Remus) Uprobes updates: - Transition from kmap_atomic to kmap_local_page (Keke Ming) - Fix incorrect lockdep condition in filter_chain() (Breno Leitao) - Fix XOL allocation failure for 32-bit tasks (Oleg Nesterov) Misc fixes and cleanups: - s390: Remove kvm_types.h from Kbuild (Randy Dunlap) - x86/intel/uncore: Convert comma to semicolon (Chen Ni) - x86/uncore: Clean up const mismatch (Greg Kroah-Hartman) - x86/ibs: Fix typo in dc_l2tlb_miss comment (Xiang-Bin Shi)" * tag 'perf-core-2026-02-09' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (58 commits) s390: remove kvm_types.h from Kbuild uprobes: Fix incorrect lockdep condition in filter_chain() x86/ibs: Fix typo in dc_l2tlb_miss comment x86/uprobes: Fix XOL allocation failure for 32-bit tasks perf/x86/intel/uncore: Convert comma to semicolon perf/x86/intel: Add support for rdpmc user disable feature perf/x86: Use macros to replace magic numbers in attr_rdpmc perf/x86/intel: Add core PMU support for Novalake perf/x86/intel: Add support for PEBS memory auxiliary info field in NVL perf/x86/intel: Add core PMU support for DMR perf/x86/intel: Add support for PEBS memory auxiliary info field in DMR perf/x86/intel: Support the 4 new OMR MSRs introduced in DMR and NVL perf/core: Fix slow perf_event_task_exit() with LBR callstacks perf/core: Speed up kexec shutdown by avoiding unnecessary cross CPU calls uprobes: use kmap_local_page() for temporary page mappings arm/uprobes: use kmap_local_page() in arch_uprobe_copy_ixol() mips/uprobes: use kmap_local_page() in arch_uprobe_copy_ixol() arm64/uprobes: use kmap_local_page() in arch_uprobe_copy_ixol() riscv/uprobes: use kmap_local_page() in arch_uprobe_copy_ixol() perf/x86/intel/uncore: Add Nova Lake support ...

arm64/uprobes: use kmap_local_page() in arch_uprobe_copy_ixol()

2026-01-06T15:34:27Z

Replace deprecated kmap_atomic() with kmap_local_page(). Signed-off-by: Keke Ming Signed-off-by: Peter Zijlstra (Intel) Acked-by: Oleg Nesterov Link: https://patch.msgid.link/20260103084243.195125-3-ming.jvle@gmail.com

arm64: simplify arch_uprobe_xol_was_trapped return

2026-01-05T16:42:59Z

convert arch_uprobe_xol_was_trapped() from explicit if/return true return false pattern to direct boolean expression return in arch/arm64/kernel/probes/uprobes.c Signed-off-by: Osama Abdelkader Reviewed-by: Anshuman Khandual Acked-by: Masami Hiramatsu (Google) Signed-off-by: Will Deacon

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

2025-12-03T01:03:55Z

Pull arm64 updates from Catalin Marinas: "These are the arm64 updates for 6.19. The biggest part is the Arm MPAM driver under drivers/resctrl/. There's a patch touching mm/ to handle spurious faults for huge pmd (similar to the pte version). The corresponding arm64 part allows us to avoid the TLB maintenance if a (huge) page is reused after a write fault. There's EFI refactoring to allow runtime services with preemption enabled and the rest is the usual perf/PMU updates and several cleanups/typos. Summary: Core features: - Basic Arm MPAM (Memory system resource Partitioning And Monitoring) driver under drivers/resctrl/ which makes use of the fs/rectrl/ API Perf and PMU: - Avoid cycle counter on multi-threaded CPUs - Extend CSPMU device probing and add additional filtering support for NVIDIA implementations - Add support for the PMUs on the NoC S3 interconnect - Add additional compatible strings for new Cortex and C1 CPUs - Add support for data source filtering to the SPE driver - Add support for i.MX8QM and "DB" PMU in the imx PMU driver Memory managemennt: - Avoid broadcast TLBI if page reused in write fault - Elide TLB invalidation if the old PTE was not valid - Drop redundant cpu_set_*_tcr_t0sz() macros - Propagate pgtable_alloc() errors outside of __create_pgd_mapping() - Propagate return value from __change_memory_common() ACPI and EFI: - Call EFI runtime services without disabling preemption - Remove unused ACPI function Miscellaneous: - ptrace support to disable streaming on SME-only systems - Improve sysreg generation to include a 'Prefix' descriptor - Replace __ASSEMBLY__ with __ASSEMBLER__ - Align register dumps in the kselftest zt-test - Remove some no longer used macros/functions - Various spelling corrections" * tag 'arm64-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux: (94 commits) arm64/mm: Document why linear map split failure upon vm_reset_perms is not problematic arm64/pageattr: Propagate return value from __change_memory_common arm64/sysreg: Remove unused define ARM64_FEATURE_FIELD_BITS KVM: arm64: selftests: Consider all 7 possible levels of cache KVM: arm64: selftests: Remove ARM64_FEATURE_FIELD_BITS and its last user arm64: atomics: lse: Remove unused parameters from ATOMIC_FETCH_OP_AND macros Documentation/arm64: Fix the typo of register names ACPI: GTDT: Get rid of acpi_arch_timer_mem_init() perf: arm_spe: Add support for filtering on data source perf: Add perf_event_attr::config4 perf/imx_ddr: Add support for PMU in DB (system interconnects) perf/imx_ddr: Get and enable optional clks perf/imx_ddr: Move ida_alloc() from ddr_perf_init() to ddr_perf_probe() dt-bindings: perf: fsl-imx-ddr: Add compatible string for i.MX8QM, i.MX8QXP and i.MX8DXL arm64: remove duplicate ARCH_HAS_MEM_ENCRYPT arm64: mm: use untagged address to calculate page index MAINTAINERS: new entry for MPAM Driver arm_mpam: Add kunit tests for props_mismatch() arm_mpam: Add kunit test for bitmap reset arm_mpam: Add helper to reset saved mbwu state ...

arm64: Fix typos and spelling errors in comments

2025-11-12T17:06:21Z

This patch corrects several minor typographical and spelling errors in comments across multiple arm64 source files. No functional changes. Signed-off-by: mrigendrachaubey Signed-off-by: Catalin Marinas

arm64: kprobes: check the return value of set_memory_rox()

2025-11-07T14:30:22Z

Since commit a166563e7ec3 ("arm64: mm: support large block mapping when rodata=full"), __change_memory_common has more chance to fail due to memory allocation failure when splitting page table. So check the return value of set_memory_rox(), then bail out if it fails otherwise we may have RW memory mapping for kprobes insn page. Fixes: 195a1b7d8388 ("arm64: kprobes: call set_memory_rox() for kprobe page") Reviewed-by: Ryan Roberts Reviewed-by: Dev Jain Signed-off-by: Yang Shi Signed-off-by: Will Deacon

arm64: kprobes: call set_memory_rox() for kprobe page

2025-09-25T12:56:48Z

The kprobe page is allocated by execmem allocator with ROX permission. It needs to call set_memory_rox() to set proper permission for the direct map too. It was missed. Fixes: 10d5e97c1bf8 ("arm64: use PAGE_KERNEL_ROX directly in alloc_insn_page") Cc: Signed-off-by: Yang Shi Reviewed-by: Catalin Marinas Signed-off-by: Will Deacon

arm64: probes: Fix incorrect bl/blr address and register usage

2025-09-18T20:06:59Z

The pt_regs registers are 64-bit on arm64, and should be u64 when manipulated. Correct this so that we aren't truncating the address during br/blr sequences. Fixes: efb07ac534e2 ("arm64: probes: Add GCS support to bl/blr/ret") Signed-off-by: Jeremy Linton Signed-off-by: Will Deacon

arm64: uprobes: Add GCS support to uretprobes

2025-09-16T20:34:06Z

Ret probes work by changing the value in the link register at the probe location to return to the probe rather than the calling routine. Thus the GCS needs to be updated with this address as well. Since its possible to insert probes at locations where the current value of the LR doesn't match the GCS state this needs to be detected and handled in order to maintain the existing no-fault behavior. Co-developed-by: Steve Capper Signed-off-by: Steve Capper Signed-off-by: Jeremy Linton Reviewed-by: Catalin Marinas [will: Add '__force' to gcspr casts in arch_uretprobe_hijack_return_addr()] Signed-off-by: Will Deacon

arm64: probes: Add GCS support to bl/blr/ret

2025-09-16T20:33:25Z

The arm64 probe simulation doesn't currently have logic in place to deal with GCS and this results in core dumps if probes are inserted at control flow locations. Fix-up bl, blr and ret to manipulate the shadow stack as needed. While we manipulate and validate the shadow stack correctly, the hardware provides additional security by only allowing GCS operations against pages which are marked to support GCS. For writing there is gcssttr() which enforces this, but there isn't an equivalent for reading. This means that uprobe users should be aware that probing on control flow instructions which require reading the shadow stack (ex: ret) offers lower security guarantees than what is achieved without the uprobe active. Signed-off-by: Jeremy Linton Reviewed-by: Catalin Marinas Signed-off-by: Will Deacon