kernel/linux.git/Documentation/arch, branch v7.0.13

arm64: errata: Mitigate TLBI errata on Microsoft Azure Cobalt 100 CPU

2026-06-19T11:48:13+00:00

commit 1940e70a8144bf75e6df26bf6f600862ea7f7ea1 upstream. Commit fb091ff39479 ("arm64: Subscribe Microsoft Azure Cobalt 100 to ARM Neoverse N2 errata") states that Microsoft Azure Cobalt 100 CPU "is a Microsoft implemented CPU based on r0p0 of the ARM Neoverse N2 CPU, and therefore suffers from all the same errata.". So enable the workaround for the latest broadcast TLB invalidation bug on these parts. Signed-off-by: Will Deacon [Mark: backport to v7.0.y] Signed-off-by: Mark Rutland Signed-off-by: Greg Kroah-Hartman

arm64: errata: Mitigate TLBI errata on NVIDIA Olympus CPU

2026-06-19T11:48:13+00:00

commit ec7216f92e4ebd485b1c6dc6aa3f6064b71a5768 upstream. NVIDIA Olympus cores are affected by the TLBI completion issue tracked as CVE-2025-10263. The existing ARM64_ERRATUM_4118414 handling already uses ARM64_WORKAROUND_REPEAT_TLBI to issue an additional broadcast TLBI;DSB sequence and ensure affected memory write effects are globally observed. Add MIDR_NVIDIA_OLYMPUS to the repeat-TLBI match list so the same mitigation is enabled on affected Olympus systems. Also document the NVIDIA Olympus erratum in the arm64 silicon errata table and list it in the Kconfig help text. Signed-off-by: Shanker Donthineni Cc: Catalin Marinas Cc: Will Deacon Cc: Mark Rutland Acked-by: Mark Rutland Signed-off-by: Will Deacon [Mark: backport to v7.0.y] Signed-off-by: Mark Rutland Signed-off-by: Greg Kroah-Hartman

arm64: errata: Mitigate TLBI errata on various Arm CPUs

2026-06-19T11:48:13+00:00

commit cfd391e74134db664feb499d43af286380b10ba8 upstream. A number of CPUs developed by Arm suffer from errata whereby a broadcast TLBI;DSB sequence may complete before the global observation of writes which are translated by an affected TLB entry. These errata ONLY affect the completion of memory accesses which have been translated by an invalidated TLB entry, and these errata DO NOT affect the actual invalidation of TLB entries. TLB entries are removed correctly. This issue has been assigned CVE ID CVE-2025-10263. To mitigate this issue, Arm recommends that software follows any affected TLBI;DSB sequence with an additional TLBI;DSB, which will ensure that all memory write effects affected by the first TLBI have been globally observed. The additional TLBI can use any operation that is broadcast to affected CPUs, and the additional DSB can use any option that is sufficient to complete the additional TLBI. The ARM64_WORKAROUND_REPEAT_TLBI workaround is sufficient to mitigate the issue. Enable this workaround for affected CPUs, and update the silicon errata documentation accordingly. Note that due to the manner in which Arm develops IP and tracks errata, some CPUs share a common erratum number. Signed-off-by: Mark Rutland Cc: Catalin Marinas Cc: Will Deacon Signed-off-by: Will Deacon [Mark: backport to v7.0.y] Signed-off-by: Mark Rutland Signed-off-by: Greg Kroah-Hartman

riscv: Docs: fix unmatched quote warning

2026-06-01T15:54:43+00:00

[ Upstream commit 50da1c9ccb70fc5250c37ac474b54ee072732ea3 ] 'make htmldocs' complains about ``prctrl` -- so add a second '`' to avoid the warning. Documentation/arch/riscv/zicfilp.rst:79: WARNING: Inline literal start-string without end-string. [docutils] Fixes: 08ee1559052b ("prctl: cfi: change the branch landing pad prctl()s to be more descriptive") Signed-off-by: Randy Dunlap Link: https://patch.msgid.link/20260406232304.1892528-1-rdunlap@infradead.org Signed-off-by: Paul Walmsley Signed-off-by: Sasha Levin

prctl: cfi: change the branch landing pad prctl()s to be more descriptive

2026-04-05T00:40:58+00:00

Per Linus' comments requesting the replacement of "INDIR_BR_LP" in the indirect branch tracking prctl()s with something more readable, and suggesting the use of the speculation control prctl()s as an exemplar, reimplement the prctl()s and related constants that control per-task forward-edge control flow integrity. This primarily involves two changes. First, the prctls are restructured to resemble the style of the speculative execution workaround control prctls PR_{GET,SET}_SPECULATION_CTRL, to make them easier to extend in the future. Second, the "indir_br_lp" abbrevation is expanded to "branch_landing_pads" to be less telegraphic. The kselftest and documentation is adjusted accordingly. Link: https://lore.kernel.org/linux-riscv/CAHk-=whhSLGZAx3N5jJpb4GLFDqH_QvS07D+6BnkPWmCEzTAgw@mail.gmail.com/ Cc: Deepak Gupta Cc: Linus Torvalds Cc: Mark Brown Signed-off-by: Paul Walmsley

Merge tag 'riscv-for-linus-7.0-mw1' of git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux

2026-02-13T03:17:44+00:00

Pull RISC-V updates from Paul Walmsley: - Add support for control flow integrity for userspace processes. This is based on the standard RISC-V ISA extensions Zicfiss and Zicfilp - Improve ptrace behavior regarding vector registers, and add some selftests - Optimize our strlen() assembly - Enable the ISO-8859-1 code page as built-in, similar to ARM64, for EFI volume mounting - Clean up some code slightly, including defining copy_user_page() as copy_page() rather than memcpy(), aligning us with other architectures; and using max3() to slightly simplify an expression in riscv_iommu_init_check() * tag 'riscv-for-linus-7.0-mw1' of git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux: (42 commits) riscv: lib: optimize strlen loop efficiency selftests: riscv: vstate_exec_nolibc: Use the regular prctl() function selftests: riscv: verify ptrace accepts valid vector csr values selftests: riscv: verify ptrace rejects invalid vector csr inputs selftests: riscv: verify syscalls discard vector context selftests: riscv: verify initial vector state with ptrace selftests: riscv: test ptrace vector interface riscv: ptrace: validate input vector csr registers riscv: csr: define vtype register elements riscv: vector: init vector context with proper vlenb riscv: ptrace: return ENODATA for inactive vector extension kselftest/riscv: add kselftest for user mode CFI riscv: add documentation for shadow stack riscv: add documentation for landing pad / indirect branch tracking riscv: create a Kconfig fragment for shadow stack and landing pad support arch/riscv: add dual vdso creation logic and select vdso based on hw arch/riscv: compile vdso with landing pad and shadow stack note riscv: enable kernel access to shadow stack memory via the FWFT SBI call riscv: add kernel command line option to opt out of user CFI riscv/hwprobe: add zicfilp / zicfiss enumeration in hwprobe ...

Merge tag 'powerpc-7.0-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux

2026-02-11T05:46:12+00:00

Pull powerpc updates for 7.0 - Implement masked user access - Add bpf support for internal only per-CPU instructions and inline the bpf_get_smp_processor_id() and bpf_get_current_task() functions - Fix pSeries MSI-X allocation failure when quota is exceeded - Fix recursive pci_lock_rescan_remove locking in EEH event handling - Support tailcalls with subprogs & BPF exceptions on 64bit - Extend "trusted" keys to support the PowerVM Key Wrapping Module (PKWM) Thanks to Abhishek Dubey, Christophe Leroy, Gaurav Batra, Guangshuo Li, Jarkko Sakkinen, Mahesh Salgaonkar, Mimi Zohar, Miquel Sabaté Solà, Nam Cao, Narayana Murty N, Nayna Jain, Nilay Shroff, Puranjay Mohan, Saket Kumar Bhaskar, Sourabh Jain, Srish Srinivasan, and Venkat Rao Bagalkote. * tag 'powerpc-7.0-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux: (27 commits) powerpc/pseries: plpks: export plpks_wrapping_is_supported docs: trusted-encryped: add PKWM as a new trust source keys/trusted_keys: establish PKWM as a trusted source pseries/plpks: add HCALLs for PowerVM Key Wrapping Module pseries/plpks: expose PowerVM wrapping features via the sysfs powerpc/pseries: move the PLPKS config inside its own sysfs directory pseries/plpks: fix kernel-doc comment inconsistencies powerpc/smp: Add check for kcalloc() failure in parse_thread_groups() powerpc: kgdb: Remove OUTBUFMAX constant powerpc64/bpf: Additional NVR handling for bpf_throw powerpc64/bpf: Support exceptions powerpc64/bpf: Add arch_bpf_stack_walk() for BPF JIT powerpc64/bpf: Avoid tailcall restore from trampoline powerpc64/bpf: Support tailcalls with subprogs powerpc64/bpf: Moving tail_call_cnt to bottom of frame powerpc/eeh: fix recursive pci_lock_rescan_remove locking in EEH event handling powerpc/pseries: Fix MSI-X allocation failure when quota is exceeded powerpc/iommu: bypass DMA APIs for coherent allocations for pre-mapped memory powerpc64/bpf: Inline bpf_get_smp_processor_id() and bpf_get_current_task/_btf() powerpc64/bpf: Support internal-only MOV instruction to resolve per-CPU addrs ...

Merge tag 'x86_misc_for_7.0-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2026-02-11T03:52:18+00:00

Pull misc x86 updates from Dave Hansen: "The usual smattering of x86/misc changes. The IPv6 patch in here surprised me in a couple of ways. First, the function it inlines is able to eat a lot more CPU time than I would have expected. Second, the inlining does not seem to bloat the kernel, at least in the configs folks have tested. - Inline x86-specific IPv6 checksum helper - Update IOMMU docs to use stable identifiers - Print unhashed pointers on fatal stack overflows" * tag 'x86_misc_for_7.0-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: x86/traps: Print unhashed pointers on stack overflow Documentation/x86: Update IOMMU spec references to use stable identifiers x86/lib: Inline csum_ipv6_magic()

Merge tag 'docs-7.0' of git://git.kernel.org/pub/scm/linux/kernel/git/docs/linux

2026-02-10T04:53:18+00:00

Pull documentation updates from Jonathan Corbet: "A slightly calmer cycle for docs this time around, though there is still a fair amount going on, including: - Some signs of life on the long-moribund Japanese translation - Documentation on policies around the use of generative tools for patch submissions, and a separate document intended for consumption by generative tools - The completion of the move of the documentation tools to tools/docs. For now we're leaving a /scripts/kernel-doc symlink behind to avoid breaking scripts - Ongoing build-system work includes the incorporation of documentation in Python code, better support for documenting variables, and lots of improvements and fixes - Automatic linking of man-page references -- cat(1), for example -- to the online pages in the HTML build ...and the usual array of typo fixes and such" * tag 'docs-7.0' of git://git.kernel.org/pub/scm/linux/kernel/git/docs/linux: (107 commits) doc: development-process: add notice on testing tools: sphinx-build-wrapper: improve its help message docs: sphinx-build-wrapper: allow -v override -q docs: kdoc: Fix pdfdocs build for tools docs: ja_JP: process: translate 'Obtain a current source tree' docs: fix 're-use' -> 'reuse' in documentation docs: ioctl-number: fix a typo in ioctl-number.rst docs: filesystems: ensure proc pid substitutable is complete docs: automarkup.py: Skip common English words as C identifiers Documentation: use a source-read extension for the index link boilerplate docs: parse_features: make documentation more consistent docs: add parse_features module documentation docs: jobserver: do some documentation improvements docs: add jobserver module documentation docs: kabi: helpers: add documentation for each "enum" value docs: kabi: helpers: add helper for debug bits 7 and 8 docs: kabi: system_symbols: end docstring phrases with a dot docs: python: abi_regex: do some improvements at documentation docs: python: abi_parser: do some improvements at documentation docs: add kabi modules documentation ...

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

2026-02-10T04:28:45+00:00

Pull arm64 updates from Will Deacon: "There's a little less than normal, probably due to LPC & Christmas/New Year meaning that a few series weren't quite ready or reviewed in time. It's still useful across the board, despite the only real feature being support for the LS64 feature enabling 64-byte atomic accesses to endpoints that support it. ACPI: - Add interrupt signalling support to the AGDI handler - Add Catalin and myself to the arm64 ACPI MAINTAINERS entry CPU features: - Drop Kconfig options for PAN and LSE (these are detected at runtime) - Add support for 64-byte single-copy atomic instructions (LS64/LS64V) - Reduce MTE overhead when executing in the kernel on Ampere CPUs - Ensure POR_EL0 value exposed via ptrace is up-to-date - Fix error handling on GCS allocation failure CPU frequency: - Add CPU hotplug support to the FIE setup in the AMU driver Entry code: - Minor optimisations and cleanups to the syscall entry path - Preparatory rework for moving to the generic syscall entry code Hardware errata: - Work around Spectre-BHB on TSV110 processors - Work around broken CMO propagation on some systems with the SI-L1 interconnect Miscellaneous: - Disable branch profiling for arch/arm64/ to avoid issues with noinstr - Minor fixes and cleanups (kexec + ubsan, WARN_ONCE() instead of WARN_ON(), reduction of boolean expression) - Fix custom __READ_ONCE() implementation for LTO builds when operating on non-atomic types Perf and PMUs: - Support for CMN-600AE - Be stricter about supported hardware in the CMN driver - Support for DSU-110 and DSU-120 - Support for the cycles event in the DSU driver (alongside the dedicated cycles counter) - Use IRQF_NO_THREAD instead of IRQF_ONESHOT in the cxlpmu driver - Use !bitmap_empty() as a faster alternative to bitmap_weight() - Fix SPE error handling when failing to resume profiling Selftests: - Add support for the FORCE_TARGETS option to the arm64 kselftests - Avoid nolibc-specific my_syscall() function - Add basic test for the LS64 HWCAP - Extend fp-pidbench to cover additional workload patterns" * tag 'arm64-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux: (43 commits) perf/arm-cmn: Reject unsupported hardware configurations perf: arm_spe: Properly set hw.state on failures arm64/gcs: Fix error handling in arch_set_shadow_stack_status() arm64: Fix non-atomic __READ_ONCE() with CONFIG_LTO=y arm64: poe: fix stale POR_EL0 values for ptrace kselftest/arm64: Raise default number of loops in fp-pidbench kselftest/arm64: Add a no-SVE loop after SVE in fp-pidbench perf/cxlpmu: Replace IRQF_ONESHOT with IRQF_NO_THREAD arm64: mte: Set TCMA1 whenever MTE is present in the kernel arm64/ptrace: Return early for ptrace_report_syscall_entry() error arm64/ptrace: Split report_syscall() arm64: Remove unused _TIF_WORK_MASK kselftest/arm64: Add missing file in .gitignore arm64: errata: Workaround for SI L1 downstream coherency issue kselftest/arm64: Add HWCAP test for FEAT_LS64 arm64: Add support for FEAT_{LS64, LS64_V} KVM: arm64: Enable FEAT_{LS64, LS64_V} in the supported guest arm64: Provide basic EL2 setup for FEAT_{LS64, LS64_V} usage at EL0/1 KVM: arm64: Handle DABT caused by LS64* instructions on unsupported memory KVM: arm64: Add documentation for KVM_EXIT_ARM_LDST64B ...