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5 daysMerge tag 'riscv-for-linus-6.18-mw2' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux Pull more RISC-V updates from Paul Walmsley: - Support for the RISC-V-standardized RPMI interface. RPMI is a platform management communication mechanism between OSes running on application processors, and a remote platform management processor. Similar to ARM SCMI, TI SCI, etc. This includes irqchip, mailbox, and clk changes. - Support for the RISC-V-standardized MPXY SBI extension. MPXY is a RISC-V-specific standard implementing a shared memory mailbox between S-mode operating systems (e.g., Linux) and M-mode firmware (e.g., OpenSBI). It is part of this PR since one of its use cases is to enable M-mode firmware to act as a single RPMI client for all RPMI activity on a core (including S-mode RPMI activity). Includes a mailbox driver. - Some ACPI-related updates to enable the use of RPMI and MPXY. - The addition of Linux-wide memcpy_{from,to}_le32() static inline functions, for RPMI use. - An ACPI Kconfig change to enable boot logos on any ACPI-using architecture (including RISC-V) - A RISC-V defconfig change to add GPIO keyboard and event device support, for front panel shutdown or reboot buttons * tag 'riscv-for-linus-6.18-mw2' of git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux: (26 commits) clk: COMMON_CLK_RPMI should depend on RISCV ACPI: support BGRT table on RISC-V MAINTAINERS: Add entry for RISC-V RPMI and MPXY drivers RISC-V: Enable GPIO keyboard and event device in RV64 defconfig irqchip/riscv-rpmi-sysmsi: Add ACPI support mailbox/riscv-sbi-mpxy: Add ACPI support irqchip/irq-riscv-imsic-early: Export imsic_acpi_get_fwnode() ACPI: RISC-V: Add RPMI System MSI to GSI mapping ACPI: RISC-V: Add support to update gsi range ACPI: RISC-V: Create interrupt controller list in sorted order ACPI: scan: Update honor list for RPMI System MSI ACPI: Add support for nargs_prop in acpi_fwnode_get_reference_args() ACPI: property: Refactor acpi_fwnode_get_reference_args() to support nargs_prop irqchip: Add driver for the RPMI system MSI service group dt-bindings: Add RPMI system MSI interrupt controller bindings dt-bindings: Add RPMI system MSI message proxy bindings clk: Add clock driver for the RISC-V RPMI clock service group dt-bindings: clock: Add RPMI clock service controller bindings dt-bindings: clock: Add RPMI clock service message proxy bindings mailbox: Add RISC-V SBI message proxy (MPXY) based mailbox driver ...
5 daysMerge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvmLinus Torvalds
Pull kvm updates from Paolo Bonzini: "This excludes the bulk of the x86 changes, which I will send separately. They have two not complex but relatively unusual conflicts so I will wait for other dust to settle. guest_memfd: - Add support for host userspace mapping of guest_memfd-backed memory for VM types that do NOT use support KVM_MEMORY_ATTRIBUTE_PRIVATE (which isn't precisely the same thing as CoCo VMs, since x86's SEV-MEM and SEV-ES have no way to detect private vs. shared). This lays the groundwork for removal of guest memory from the kernel direct map, as well as for limited mmap() for guest_memfd-backed memory. For more information see: - commit a6ad54137af9 ("Merge branch 'guest-memfd-mmap' into HEAD") - guest_memfd in Firecracker: https://github.com/firecracker-microvm/firecracker/tree/feature/secret-hiding - direct map removal: https://lore.kernel.org/all/20250221160728.1584559-1-roypat@amazon.co.uk/ - mmap support: https://lore.kernel.org/all/20250328153133.3504118-1-tabba@google.com/ ARM: - Add support for FF-A 1.2 as the secure memory conduit for pKVM, allowing more registers to be used as part of the message payload. - Change the way pKVM allocates its VM handles, making sure that the privileged hypervisor is never tricked into using uninitialised data. - Speed up MMIO range registration by avoiding unnecessary RCU synchronisation, which results in VMs starting much quicker. - Add the dump of the instruction stream when panic-ing in the EL2 payload, just like the rest of the kernel has always done. This will hopefully help debugging non-VHE setups. - Add 52bit PA support to the stage-1 page-table walker, and make use of it to populate the fault level reported to the guest on failing to translate a stage-1 walk. - Add NV support to the GICv3-on-GICv5 emulation code, ensuring feature parity for guests, irrespective of the host platform. - Fix some really ugly architecture problems when dealing with debug in a nested VM. This has some bad performance impacts, but is at least correct. - Add enough infrastructure to be able to disable EL2 features and give effective values to the EL2 control registers. This then allows a bunch of features to be turned off, which helps cross-host migration. - Large rework of the selftest infrastructure to allow most tests to transparently run at EL2. This is the first step towards enabling NV testing. - Various fixes and improvements all over the map, including one BE fix, just in time for the removal of the feature. LoongArch: - Detect page table walk feature on new hardware - Add sign extension with kernel MMIO/IOCSR emulation - Improve in-kernel IPI emulation - Improve in-kernel PCH-PIC emulation - Move kvm_iocsr tracepoint out of generic code RISC-V: - Added SBI FWFT extension for Guest/VM with misaligned delegation and pointer masking PMLEN features - Added ONE_REG interface for SBI FWFT extension - Added Zicbop and bfloat16 extensions for Guest/VM - Enabled more common KVM selftests for RISC-V - Added SBI v3.0 PMU enhancements in KVM and perf driver s390: - Improve interrupt cpu for wakeup, in particular the heuristic to decide which vCPU to deliver a floating interrupt to. - Clear the PTE when discarding a swapped page because of CMMA; this bug was introduced in 6.16 when refactoring gmap code. x86 selftests: - Add #DE coverage in the fastops test (the only exception that's guest- triggerable in fastop-emulated instructions). - Fix PMU selftests errors encountered on Granite Rapids (GNR), Sierra Forest (SRF) and Clearwater Forest (CWF). - Minor cleanups and improvements x86 (guest side): - For the legacy PCI hole (memory between TOLUD and 4GiB) to UC when overriding guest MTRR for TDX/SNP to fix an issue where ACPI auto-mapping could map devices as WB and prevent the device drivers from mapping their devices with UC/UC-. - Make kvm_async_pf_task_wake() a local static helper and remove its export. - Use native qspinlocks when running in a VM with dedicated vCPU=>pCPU bindings even when PV_UNHALT is unsupported. Generic: - Remove a redundant __GFP_NOWARN from kvm_setup_async_pf() as __GFP_NOWARN is now included in GFP_NOWAIT. * tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm: (178 commits) KVM: s390: Fix to clear PTE when discarding a swapped page KVM: arm64: selftests: Cover ID_AA64ISAR3_EL1 in set_id_regs KVM: arm64: selftests: Remove a duplicate register listing in set_id_regs KVM: arm64: selftests: Cope with arch silliness in EL2 selftest KVM: arm64: selftests: Add basic test for running in VHE EL2 KVM: arm64: selftests: Enable EL2 by default KVM: arm64: selftests: Initialize HCR_EL2 KVM: arm64: selftests: Use the vCPU attr for setting nr of PMU counters KVM: arm64: selftests: Use hyp timer IRQs when test runs at EL2 KVM: arm64: selftests: Select SMCCC conduit based on current EL KVM: arm64: selftests: Provide helper for getting default vCPU target KVM: arm64: selftests: Alias EL1 registers to EL2 counterparts KVM: arm64: selftests: Create a VGICv3 for 'default' VMs KVM: arm64: selftests: Add unsanitised helpers for VGICv3 creation KVM: arm64: selftests: Add helper to check for VGICv3 support KVM: arm64: selftests: Initialize VGICv3 only once KVM: arm64: selftests: Provide kvm_arch_vm_post_create() in library code KVM: selftests: Add ex_str() to print human friendly name of exception vectors selftests/kvm: remove stale TODO in xapic_state_test KVM: selftests: Handle Intel Atom errata that leads to PMU event overcount ...
7 daysMerge tag 'mm-stable-2025-10-01-19-00' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm Pull MM updates from Andrew Morton: - "mm, swap: improve cluster scan strategy" from Kairui Song improves performance and reduces the failure rate of swap cluster allocation - "support large align and nid in Rust allocators" from Vitaly Wool permits Rust allocators to set NUMA node and large alignment when perforning slub and vmalloc reallocs - "mm/damon/vaddr: support stat-purpose DAMOS" from Yueyang Pan extend DAMOS_STAT's handling of the DAMON operations sets for virtual address spaces for ops-level DAMOS filters - "execute PROCMAP_QUERY ioctl under per-vma lock" from Suren Baghdasaryan reduces mmap_lock contention during reads of /proc/pid/maps - "mm/mincore: minor clean up for swap cache checking" from Kairui Song performs some cleanup in the swap code - "mm: vm_normal_page*() improvements" from David Hildenbrand provides code cleanup in the pagemap code - "add persistent huge zero folio support" from Pankaj Raghav provides a block layer speedup by optionalls making the huge_zero_pagepersistent, instead of releasing it when its refcount falls to zero - "kho: fixes and cleanups" from Mike Rapoport adds a few touchups to the recently added Kexec Handover feature - "mm: make mm->flags a bitmap and 64-bit on all arches" from Lorenzo Stoakes turns mm_struct.flags into a bitmap. To end the constant struggle with space shortage on 32-bit conflicting with 64-bit's needs - "mm/swapfile.c and swap.h cleanup" from Chris Li cleans up some swap code - "selftests/mm: Fix false positives and skip unsupported tests" from Donet Tom fixes a few things in our selftests code - "prctl: extend PR_SET_THP_DISABLE to only provide THPs when advised" from David Hildenbrand "allows individual processes to opt-out of THP=always into THP=madvise, without affecting other workloads on the system". It's a long story - the [1/N] changelog spells out the considerations - "Add and use memdesc_flags_t" from Matthew Wilcox gets us started on the memdesc project. Please see https://kernelnewbies.org/MatthewWilcox/Memdescs and https://blogs.oracle.com/linux/post/introducing-memdesc - "Tiny optimization for large read operations" from Chi Zhiling improves the efficiency of the pagecache read path - "Better split_huge_page_test result check" from Zi Yan improves our folio splitting selftest code - "test that rmap behaves as expected" from Wei Yang adds some rmap selftests - "remove write_cache_pages()" from Christoph Hellwig removes that function and converts its two remaining callers - "selftests/mm: uffd-stress fixes" from Dev Jain fixes some UFFD selftests issues - "introduce kernel file mapped folios" from Boris Burkov introduces the concept of "kernel file pages". Using these permits btrfs to account its metadata pages to the root cgroup, rather than to the cgroups of random inappropriate tasks - "mm/pageblock: improve readability of some pageblock handling" from Wei Yang provides some readability improvements to the page allocator code - "mm/damon: support ARM32 with LPAE" from SeongJae Park teaches DAMON to understand arm32 highmem - "tools: testing: Use existing atomic.h for vma/maple tests" from Brendan Jackman performs some code cleanups and deduplication under tools/testing/ - "maple_tree: Fix testing for 32bit compiles" from Liam Howlett fixes a couple of 32-bit issues in tools/testing/radix-tree.c - "kasan: unify kasan_enabled() and remove arch-specific implementations" from Sabyrzhan Tasbolatov moves KASAN arch-specific initialization code into a common arch-neutral implementation - "mm: remove zpool" from Johannes Weiner removes zspool - an indirection layer which now only redirects to a single thing (zsmalloc) - "mm: task_stack: Stack handling cleanups" from Pasha Tatashin makes a couple of cleanups in the fork code - "mm: remove nth_page()" from David Hildenbrand makes rather a lot of adjustments at various nth_page() callsites, eventually permitting the removal of that undesirable helper function - "introduce kasan.write_only option in hw-tags" from Yeoreum Yun creates a KASAN read-only mode for ARM, using that architecture's memory tagging feature. It is felt that a read-only mode KASAN is suitable for use in production systems rather than debug-only - "mm: hugetlb: cleanup hugetlb folio allocation" from Kefeng Wang does some tidying in the hugetlb folio allocation code - "mm: establish const-correctness for pointer parameters" from Max Kellermann makes quite a number of the MM API functions more accurate about the constness of their arguments. This was getting in the way of subsystems (in this case CEPH) when they attempt to improving their own const/non-const accuracy - "Cleanup free_pages() misuse" from Vishal Moola fixes a number of code sites which were confused over when to use free_pages() vs __free_pages() - "Add Rust abstraction for Maple Trees" from Alice Ryhl makes the mapletree code accessible to Rust. Required by nouveau and by its forthcoming successor: the new Rust Nova driver - "selftests/mm: split_huge_page_test: split_pte_mapped_thp improvements" from David Hildenbrand adds a fix and some cleanups to the thp selftesting code - "mm, swap: introduce swap table as swap cache (phase I)" from Chris Li and Kairui Song is the first step along the path to implementing "swap tables" - a new approach to swap allocation and state tracking which is expected to yield speed and space improvements. This patchset itself yields a 5-20% performance benefit in some situations - "Some ptdesc cleanups" from Matthew Wilcox utilizes the new memdesc layer to clean up the ptdesc code a little - "Fix va_high_addr_switch.sh test failure" from Chunyu Hu fixes some issues in our 5-level pagetable selftesting code - "Minor fixes for memory allocation profiling" from Suren Baghdasaryan addresses a couple of minor issues in relatively new memory allocation profiling feature - "Small cleanups" from Matthew Wilcox has a few cleanups in preparation for more memdesc work - "mm/damon: add addr_unit for DAMON_LRU_SORT and DAMON_RECLAIM" from Quanmin Yan makes some changes to DAMON in furtherance of supporting arm highmem - "selftests/mm: Add -Wunreachable-code and fix warnings" from Muhammad Anjum adds that compiler check to selftests code and fixes the fallout, by removing dead code - "Improvements to Victim Process Thawing and OOM Reaper Traversal Order" from zhongjinji makes a number of improvements in the OOM killer: mainly thawing a more appropriate group of victim threads so they can release resources - "mm/damon: misc fixups and improvements for 6.18" from SeongJae Park is a bunch of small and unrelated fixups for DAMON - "mm/damon: define and use DAMON initialization check function" from SeongJae Park implement reliability and maintainability improvements to a recently-added bug fix - "mm/damon/stat: expose auto-tuned intervals and non-idle ages" from SeongJae Park provides additional transparency to userspace clients of the DAMON_STAT information - "Expand scope of khugepaged anonymous collapse" from Dev Jain removes some constraints on khubepaged's collapsing of anon VMAs. It also increases the success rate of MADV_COLLAPSE against an anon vma - "mm: do not assume file == vma->vm_file in compat_vma_mmap_prepare()" from Lorenzo Stoakes moves us further towards removal of file_operations.mmap(). This patchset concentrates upon clearing up the treatment of stacked filesystems - "mm: Improve mlock tracking for large folios" from Kiryl Shutsemau provides some fixes and improvements to mlock's tracking of large folios. /proc/meminfo's "Mlocked" field became more accurate - "mm/ksm: Fix incorrect accounting of KSM counters during fork" from Donet Tom fixes several user-visible KSM stats inaccuracies across forks and adds selftest code to verify these counters - "mm_slot: fix the usage of mm_slot_entry" from Wei Yang addresses some potential but presently benign issues in KSM's mm_slot handling * tag 'mm-stable-2025-10-01-19-00' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm: (372 commits) mm: swap: check for stable address space before operating on the VMA mm: convert folio_page() back to a macro mm/khugepaged: use start_addr/addr for improved readability hugetlbfs: skip VMAs without shareable locks in hugetlb_vmdelete_list alloc_tag: fix boot failure due to NULL pointer dereference mm: silence data-race in update_hiwater_rss mm/memory-failure: don't select MEMORY_ISOLATION mm/khugepaged: remove definition of struct khugepaged_mm_slot mm/ksm: get mm_slot by mm_slot_entry() when slot is !NULL hugetlb: increase number of reserving hugepages via cmdline selftests/mm: add fork inheritance test for ksm_merging_pages counter mm/ksm: fix incorrect KSM counter handling in mm_struct during fork drivers/base/node: fix double free in register_one_node() mm: remove PMD alignment constraint in execmem_vmalloc() mm/memory_hotplug: fix typo 'esecially' -> 'especially' mm/rmap: improve mlock tracking for large folios mm/filemap: map entire large folio faultaround mm/fault: try to map the entire file folio in finish_fault() mm/rmap: mlock large folios in try_to_unmap_one() mm/rmap: fix a mlock race condition in folio_referenced_one() ...
9 daysMerge tag 'bpf-next-6.18' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next Pull bpf updates from Alexei Starovoitov: - Support pulling non-linear xdp data with bpf_xdp_pull_data() kfunc (Amery Hung) Applied as a stable branch in bpf-next and net-next trees. - Support reading skb metadata via bpf_dynptr (Jakub Sitnicki) Also a stable branch in bpf-next and net-next trees. - Enforce expected_attach_type for tailcall compatibility (Daniel Borkmann) - Replace path-sensitive with path-insensitive live stack analysis in the verifier (Eduard Zingerman) This is a significant change in the verification logic. More details, motivation, long term plans are in the cover letter/merge commit. - Support signed BPF programs (KP Singh) This is another major feature that took years to materialize. Algorithm details are in the cover letter/marge commit - Add support for may_goto instruction to s390 JIT (Ilya Leoshkevich) - Add support for may_goto instruction to arm64 JIT (Puranjay Mohan) - Fix USDT SIB argument handling in libbpf (Jiawei Zhao) - Allow uprobe-bpf program to change context registers (Jiri Olsa) - Support signed loads from BPF arena (Kumar Kartikeya Dwivedi and Puranjay Mohan) - Allow access to union arguments in tracing programs (Leon Hwang) - Optimize rcu_read_lock() + migrate_disable() combination where it's used in BPF subsystem (Menglong Dong) - Introduce bpf_task_work_schedule*() kfuncs to schedule deferred execution of BPF callback in the context of a specific task using the kernel’s task_work infrastructure (Mykyta Yatsenko) - Enforce RCU protection for KF_RCU_PROTECTED kfuncs (Kumar Kartikeya Dwivedi) - Add stress test for rqspinlock in NMI (Kumar Kartikeya Dwivedi) - Improve the precision of tnum multiplier verifier operation (Nandakumar Edamana) - Use tnums to improve is_branch_taken() logic (Paul Chaignon) - Add support for atomic operations in arena in riscv JIT (Pu Lehui) - Report arena faults to BPF error stream (Puranjay Mohan) - Search for tracefs at /sys/kernel/tracing first in bpftool (Quentin Monnet) - Add bpf_strcasecmp() kfunc (Rong Tao) - Support lookup_and_delete_elem command in BPF_MAP_STACK_TRACE (Tao Chen) * tag 'bpf-next-6.18' of git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next: (197 commits) libbpf: Replace AF_ALG with open coded SHA-256 selftests/bpf: Add stress test for rqspinlock in NMI selftests/bpf: Add test case for different expected_attach_type bpf: Enforce expected_attach_type for tailcall compatibility bpftool: Remove duplicate string.h header bpf: Remove duplicate crypto/sha2.h header libbpf: Fix error when st-prefix_ops and ops from differ btf selftests/bpf: Test changing packet data from kfunc selftests/bpf: Add stacktrace map lookup_and_delete_elem test case selftests/bpf: Refactor stacktrace_map case with skeleton bpf: Add lookup_and_delete_elem for BPF_MAP_STACK_TRACE selftests/bpf: Fix flaky bpf_cookie selftest selftests/bpf: Test changing packet data from global functions with a kfunc bpf: Emit struct bpf_xdp_sock type in vmlinux BTF selftests/bpf: Task_work selftest cleanup fixes MAINTAINERS: Delete inactive maintainers from AF_XDP bpf: Mark kfuncs as __noclone selftests/bpf: Add kprobe multi write ctx attach test selftests/bpf: Add kprobe write ctx attach test selftests/bpf: Add uprobe context ip register change test ...
9 daysMerge tag 'core-core-2025-09-29' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip Pull TIF bit unification updates from Thomas Gleixner: "A set of changes to consolidate the generic TIF (thread info flag) bits accross architectures. All architectures define the same set of generic TIF bits. This makes it pointlessly hard to add a new generic TIF bit or to change an existing one. Provide a generic variant and convert the architectures which utilize the generic entry code over to use it. The TIF space is divided into 16 generic bits and 16 architecture specific bits, which turned out to provide enough space on both sides" * tag 'core-core-2025-09-29' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: LoongArch: Fix bitflag conflict for TIF_FIXADE riscv: Use generic TIF bits loongarch: Use generic TIF bits s390/entry: Remove unused TIF flags s390: Use generic TIF bits x86: Use generic TIF bits asm-generic: Provide generic TIF infrastructure
10 daysMerge tag 'riscv-for-linus-6.18-mw1' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux Pull RISC-V updates from Paul Walmsley - Replacement of __ASSEMBLY__ with __ASSEMBLER__ in header files (other architectures have already merged this type of cleanup) - The introduction of ioremap_wc() for RISC-V - Cleanup of the RISC-V kprobes code to use mostly-extant macros rather than open code - A RISC-V kprobes unit test - An architecture-specific endianness swap macro set implementation, leveraging some dedicated RISC-V instructions for this purpose if they are available - The ability to identity and communicate to userspace the presence of a MIPS P8700-specific ISA extension, and to leverage its MIPS-specific PAUSE implementation in cpu_relax() - Several other miscellaneous cleanups * tag 'riscv-for-linus-6.18-mw1' of git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux: (39 commits) riscv: errata: Fix the PAUSE Opcode for MIPS P8700 riscv: hwprobe: Document MIPS xmipsexectl vendor extension riscv: hwprobe: Add MIPS vendor extension probing riscv: Add xmipsexectl instructions riscv: Add xmipsexectl as a vendor extension dt-bindings: riscv: Add xmipsexectl ISA extension description riscv: cpufeature: add validation for zfa, zfh and zfhmin perf: riscv: skip empty batches in counter start selftests: riscv: Add README for RISC-V KSelfTest riscv: sbi: Switch to new sys-off handler API riscv: Move vendor errata definitions to new header RISC-V: ACPI: enable parsing the BGRT table riscv: Enable ARCH_HAVE_NMI_SAFE_CMPXCHG riscv: pi: use 'targets' instead of extra-y in Makefile riscv: introduce asm/swab.h riscv: mmap(): use unsigned offset type in riscv_sys_mmap drivers/perf: riscv: Remove redundant ternary operators riscv: mm: Use mmu-type from FDT to limit SATP mode riscv: mm: Return intended SATP mode for noXlvl options riscv: kprobes: Remove duplication of RV_EXTRACT_ITYPE_IMM ...
10 daysMerge tag 'hardening-v6.18-rc1' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux Pull hardening updates from Kees Cook: "One notable addition is the creation of the 'transitional' keyword for kconfig so CONFIG renaming can go more smoothly. This has been a long-standing deficiency, and with the renaming of CONFIG_CFI_CLANG to CONFIG_CFI (since GCC will soon have KCFI support), this came up again. The breadth of the diffstat is mainly this renaming. - Clean up usage of TRAILING_OVERLAP() (Gustavo A. R. Silva) - lkdtm: fortify: Fix potential NULL dereference on kmalloc failure (Junjie Cao) - Add str_assert_deassert() helper (Lad Prabhakar) - gcc-plugins: Remove TODO_verify_il for GCC >= 16 - kconfig: Fix BrokenPipeError warnings in selftests - kconfig: Add transitional symbol attribute for migration support - kcfi: Rename CONFIG_CFI_CLANG to CONFIG_CFI" * tag 'hardening-v6.18-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux: lib/string_choices: Add str_assert_deassert() helper kcfi: Rename CONFIG_CFI_CLANG to CONFIG_CFI kconfig: Add transitional symbol attribute for migration support kconfig: Fix BrokenPipeError warnings in selftests gcc-plugins: Remove TODO_verify_il for GCC >= 16 stddef: Introduce __TRAILING_OVERLAP() stddef: Remove token-pasting in TRAILING_OVERLAP() lkdtm: fortify: Fix potential NULL dereference on kmalloc failure
10 daysMerge tag 'ffs-const-v6.18-rc1' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux Pull ffs const-attribute cleanups from Kees Cook: "While working on various hardening refactoring a while back we encountered inconsistencies in the application of __attribute_const__ on the ffs() family of functions. This series fixes this across all archs and adds KUnit tests. Notably, this found a theoretical underflow in PCI (also fixed here) and uncovered an inefficiency in ARC (fixed in the ARC arch PR). I kept the series separate from the general hardening PR since it is a stand-alone "topic". - PCI: Fix theoretical underflow in use of ffs(). - Universally apply __attribute_const__ to all architecture's ffs()-family of functions. - Add KUnit tests for ffs() behavior and const-ness" * tag 'ffs-const-v6.18-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux: KUnit: ffs: Validate all the __attribute_const__ annotations sparc: Add __attribute_const__ to ffs()-family implementations xtensa: Add __attribute_const__ to ffs()-family implementations s390: Add __attribute_const__ to ffs()-family implementations parisc: Add __attribute_const__ to ffs()-family implementations mips: Add __attribute_const__ to ffs()-family implementations m68k: Add __attribute_const__ to ffs()-family implementations openrisc: Add __attribute_const__ to ffs()-family implementations riscv: Add __attribute_const__ to ffs()-family implementations hexagon: Add __attribute_const__ to ffs()-family implementations alpha: Add __attribute_const__ to ffs()-family implementations sh: Add __attribute_const__ to ffs()-family implementations powerpc: Add __attribute_const__ to ffs()-family implementations x86: Add __attribute_const__ to ffs()-family implementations csky: Add __attribute_const__ to ffs()-family implementations bitops: Add __attribute_const__ to generic ffs()-family implementations KUnit: Introduce ffs()-family tests PCI: Test for bit underflow in pcie_set_readrq()
14 daysACPI: RISC-V: Add RPMI System MSI to GSI mappingSunil V L
The RPMI System MSI device will provide GSIs to downstream devices (such as GED) so add it to the RISC-V GSI to fwnode mapping. Signed-off-by: Sunil V L <sunilvl@ventanamicro.com> Signed-off-by: Anup Patel <apatel@ventanamicro.com> Acked-by: Jassi Brar <jassisinghbrar@gmail.com> Link: https://lore.kernel.org/r/20250818040920.272664-20-apatel@ventanamicro.com Signed-off-by: Paul Walmsley <pjw@kernel.org>
14 daysACPI: RISC-V: Add support to update gsi rangeSunil V L
Some RISC-V interrupt controllers like RPMI based system MSI interrupt controllers do not have MADT entry defined. These interrupt controllers exist only in the namespace. ACPI spec defines _GSB method to get the GSI base of the interrupt controller, However, there is no such standard method to get the GSI range. To support such interrupt controllers, set the GSI range of such interrupt controllers to non-overlapping range and provide API for interrupt controller driver to update it with proper value. Signed-off-by: Sunil V L <sunilvl@ventanamicro.com> Signed-off-by: Anup Patel <apatel@ventanamicro.com> Acked-by: Jassi Brar <jassisinghbrar@gmail.com> Link: https://lore.kernel.org/r/20250818040920.272664-19-apatel@ventanamicro.com Signed-off-by: Paul Walmsley <pjw@kernel.org>
2025-09-24RISC-V: Add defines for the SBI message proxy extensionAnup Patel
Add defines for the new SBI message proxy extension which is part of the SBI v3.0 specification. Reviewed-by: Atish Patra <atishp@rivosinc.com> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Co-developed-by: Rahul Pathak <rpathak@ventanamicro.com> Signed-off-by: Rahul Pathak <rpathak@ventanamicro.com> Signed-off-by: Anup Patel <apatel@ventanamicro.com> Link: https://lore.kernel.org/r/20250818040920.272664-4-apatel@ventanamicro.com Signed-off-by: Paul Walmsley <pjw@kernel.org>
2025-09-24kcfi: Rename CONFIG_CFI_CLANG to CONFIG_CFIKees Cook
The kernel's CFI implementation uses the KCFI ABI specifically, and is not strictly tied to a particular compiler. In preparation for GCC supporting KCFI, rename CONFIG_CFI_CLANG to CONFIG_CFI (along with associated options). Use new "transitional" Kconfig option for old CONFIG_CFI_CLANG that will enable CONFIG_CFI during olddefconfig. Reviewed-by: Linus Walleij <linus.walleij@linaro.org> Reviewed-by: Nathan Chancellor <nathan@kernel.org> Link: https://lore.kernel.org/r/20250923213422.1105654-3-kees@kernel.org Signed-off-by: Kees Cook <kees@kernel.org>
2025-09-23riscv: Use an atomic xchg in pudp_huge_get_and_clear()Alexandre Ghiti
Make sure we return the right pud value and not a value that could have been overwritten in between by a different core. Fixes: c3cc2a4a3a23 ("riscv: Add support for PUD THP") Cc: stable@vger.kernel.org Signed-off-by: Alexandre Ghiti <alexghiti@rivosinc.com> Link: https://lore.kernel.org/r/20250814-dev-alex-thp_pud_xchg-v1-1-b4704dfae206@rivosinc.com [pjw@kernel.org: use xchg rather than atomic_long_xchg; avoid atomic op for !CONFIG_SMP like x86] Signed-off-by: Paul Walmsley <pjw@kernel.org>
2025-09-19riscv: errata: Fix the PAUSE Opcode for MIPS P8700Djordje Todorovic
Add ERRATA_MIPS and ERRATA_MIPS_P8700_PAUSE_OPCODE configs. Handle errata for the MIPS PAUSE instruction. Signed-off-by: Djordje Todorovic <djordje.todorovic@htecgroup.com> Signed-off-by: Aleksandar Rikalo <arikalo@gmail.com> Signed-off-by: Raj Vishwanathan4 <rvishwanathan@mips.com> Signed-off-by: Aleksa Paunovic <aleksa.paunovic@htecgroup.com> Reviewed-by: Alexandre Ghiti <alexghiti@rivosinc.com> Link: https://lore.kernel.org/r/20250724-p8700-pause-v5-7-a6cbbe1c3412@htecgroup.com [pjw@kernel.org: updated to apply and compile; fixed a checkpatch issue] Signed-off-by: Paul Walmsley <pjw@kernel.org>
2025-09-19riscv: hwprobe: Add MIPS vendor extension probingAleksa Paunovic
Add a new hwprobe key "RISCV_HWPROBE_KEY_VENDOR_EXT_MIPS_0" which allows userspace to probe for the new xmipsexectl vendor extension. Signed-off-by: Aleksa Paunovic <aleksa.paunovic@htecgroup.com> Reviewed-by: Alexandre Ghiti <alexghiti@rivosinc.com> Link: https://lore.kernel.org/r/20250724-p8700-pause-v5-4-a6cbbe1c3412@htecgroup.com [pjw@kernel.org: fixed some checkpatch issues] Signed-off-by: Paul Walmsley <pjw@kernel.org>
2025-09-19riscv: Add xmipsexectl instructionsAleksa Paunovic
Add xmipsexectl instruction opcodes. This includes the MIPS.PAUSE, MIPS.EHB, and MIPS.IHB instructions. Signed-off-by: Aleksa Paunovic <aleksa.paunovic@htecgroup.com> Reviewed-by: Alexandre Ghiti <alexghiti@rivosinc.com> Link: https://lore.kernel.org/r/20250724-p8700-pause-v5-3-a6cbbe1c3412@htecgroup.com Signed-off-by: Paul Walmsley <pjw@kernel.org>
2025-09-18riscv: Add xmipsexectl as a vendor extensionAleksa Paunovic
Add support for MIPS vendor extensions. Add support for the xmipsexectl vendor extension. Signed-off-by: Aleksa Paunovic <aleksa.paunovic@htecgroup.com> Reviewed-by: Alexandre Ghiti <alexghiti@rivosinc.com> Link: https://lore.kernel.org/r/20250724-p8700-pause-v5-2-a6cbbe1c3412@htecgroup.com [pjw@kernel.org: added the MIPS vendor ID from another patch to fix the build] Signed-off-by: Paul Walmsley <pjw@kernel.org>
2025-09-18riscv: Move vendor errata definitions to new headerGuo Ren (Alibaba DAMO Academy)
Move vendor errata definitions into errata_list_vendors.h. Signed-off-by: Guo Ren (Alibaba DAMO Academy) <guoren@kernel.org> Reviewed-by: Alexandre Ghiti <alexghiti@rivosinc.com> Tested-by: Han Gao <rabenda.cn@gmail.com> Link: https://lore.kernel.org/r/20250713155321.2064856-2-guoren@kernel.org [pjw@kernel.org: updated to apply and to make the whitespace consistent] Signed-off-by: Paul Walmsley <pjw@kernel.org>
2025-09-18riscv: introduce asm/swab.hIgnacio Encinas
Implement endianness swap macros for RISC-V. Use the rev8 instruction when Zbb is available. Otherwise, rely on the default mask-and-shift implementation. Acked-by: Palmer Dabbelt <palmer@rivosinc.com> Reviewed-by: Alexandre Ghiti <alexghiti@rivosinc.com> Tested-by: Alexandre Ghiti <alexghiti@rivosinc.com> Signed-off-by: Ignacio Encinas <ignacio@iencinas.com> Link: https://lore.kernel.org/r/20250723-riscv-swab-v6-1-fc11e9a2efc9@iencinas.com Signed-off-by: Paul Walmsley <pjw@kernel.org>
2025-09-17riscv: Use generic TIF bitsThomas Gleixner
No point in defining generic items and the upcoming RSEQ optimizations are only available with this _and_ the generic entry infrastructure, which is already used by RISCV. So no further action required here. Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2025-09-16riscv: kprobes: Move branch_funct3 to insn.hNam Cao
Similar to other instruction-processing macros/functions, branch_funct3 should be in insn.h. Move it into insn.h as RV_EXTRACT_FUNCT3. This new name matches the style in insn.h. Signed-off-by: Nam Cao <namcao@linutronix.de> Reviewed-by: Alexandre Ghiti <alexghiti@rivosinc.com> Link: https://lore.kernel.org/linux-riscv/200c29a26338f19d09963fa02562787e8cfa06f2.1747215274.git.namcao@linutronix.de/ [pjw@kernel.org: updated to use RV_X_MASK and to apply] Signed-off-by: Paul Walmsley <pjw@kernel.org>
2025-09-16riscv: kprobes: Move branch_rs2_idx to insn.hNam Cao
Similar to other instruction-processing macros/functions, branch_rs2_idx should be in insn.h. Move it into insn.h as RV_EXTRACT_RS2_REG. This new name matches the style in insn.h. Signed-off-by: Nam Cao <namcao@linutronix.de> Reviewed-by: Alexandre Ghiti <alexghiti@rivosinc.com> Link: https://lore.kernel.org/linux-riscv/107d4a6c1818bf169be2407b273a0483e6d55bbb.1747215274.git.namcao@linutronix.de/ [pjw@kernel.org: updated to use RV_X_MASK and to apply] Signed-off-by: Paul Walmsley <pjw@kernel.org>
2025-09-16riscv: Move all duplicate insn parsing macros into asm/insn.hAlexandre Ghiti
kernel/traps_misaligned.c and kvm/vcpu_insn.c define the same macros to extract information from the instructions. Let's move the definitions into asm/insn.h to avoid this duplication. Reviewed-by: Andrew Jones <ajones@ventanamicro.com> Signed-off-by: Alexandre Ghiti <alexghiti@rivosinc.com> Reviewed-by: Clément Léger <cleger@rivosinc.com> Link: https://lore.kernel.org/r/20250620-dev-alex-insn_duplicate_v5_manual-v5-3-d865dc9ad180@rivosinc.com [pjw@kernel.org: updated to apply] Signed-off-by: Paul Walmsley <pjw@kernel.org>
2025-09-16riscv: Strengthen duplicate and inconsistent definition of RV_X()Alexandre Ghiti
RV_X() macro is defined in two different ways which is error prone. So harmonize its first definition and add another macro RV_X_MASK() for the second one. Reviewed-by: Andrew Jones <ajones@ventanamicro.com> Signed-off-by: Alexandre Ghiti <alexghiti@rivosinc.com> Link: https://lore.kernel.org/r/20250620-dev-alex-insn_duplicate_v5_manual-v5-2-d865dc9ad180@rivosinc.com [pjw@kernel.org: upcase the macro name to conform with previous practice] Signed-off-by: Paul Walmsley <pjw@kernel.org>
2025-09-16riscv: Fix typo EXRACT -> EXTRACTAlexandre Ghiti
Simply fix a typo. Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org> Reviewed-by: Andrew Jones <ajones@ventanamicro.com> Signed-off-by: Alexandre Ghiti <alexghiti@rivosinc.com> Reviewed-by: Clément Léger <cleger@rivosinc.com> Link: https://lore.kernel.org/r/20250620-dev-alex-insn_duplicate_v5_manual-v5-1-d865dc9ad180@rivosinc.com Signed-off-by: Paul Walmsley <pjw@kernel.org>
2025-09-16riscv: Replace __ASSEMBLY__ with __ASSEMBLER__ in non-uapi headersThomas Huth
While the GCC and Clang compilers already define __ASSEMBLER__ automatically when compiling assembly code, __ASSEMBLY__ is a macro that only gets defined by the Makefiles in the kernel. This can be very confusing when switching between userspace and kernelspace coding, or when dealing with uapi headers that rather should use __ASSEMBLER__ instead. So let's standardize on the __ASSEMBLER__ macro that is provided by the compilers now. This originally was a completely mechanical patch (done with a simple "sed -i" statement), with some manual fixups during rebasing of the patch later. Cc: Paul Walmsley <paul.walmsley@sifive.com> Cc: Palmer Dabbelt <palmer@dabbelt.com> Cc: Albert Ou <aou@eecs.berkeley.edu> Cc: Alexandre Ghiti <alex@ghiti.fr> Cc: linux-riscv@lists.infradead.org Signed-off-by: Thomas Huth <thuth@redhat.com> Link: https://lore.kernel.org/r/20250606070952.498274-3-thuth@redhat.com Signed-off-by: Paul Walmsley <pjw@kernel.org>
2025-09-16riscv: introduce ioremap_wc()Yunhui Cui
Compared with IO attributes, NC attributes can improve performance, specifically in these aspects: Relaxed Order, Gathering, Supports Read Speculation, Supports Unaligned Access. Signed-off-by: Yunhui Cui <cuiyunhui@bytedance.com> Signed-off-by: Qingfang Deng <qingfang.deng@siflower.com.cn> Reviewed-by: Alexandre Ghiti <alexghiti@rivosinc.com> Link: https://lore.kernel.org/r/20250722091504.45974-2-cuiyunhui@bytedance.com Signed-off-by: Paul Walmsley <pjw@kernel.org>
2025-09-16RISC-V: KVM: Upgrade the supported SBI version to 3.0Atish Patra
Upgrade the SBI version to v3.0 so that corresponding features can be enabled in the guest. Reviewed-by: Anup Patel <anup@brainfault.org> Signed-off-by: Atish Patra <atishp@rivosinc.com> Acked-by: Paul Walmsley <pjw@kernel.org> Link: https://lore.kernel.org/r/20250909-pmu_event_info-v6-8-d8f80cacb884@rivosinc.com Signed-off-by: Anup Patel <anup@brainfault.org>
2025-09-16RISC-V: KVM: Implement get event info functionAtish Patra
The new get_event_info funciton allows the guest to query the presence of multiple events with single SBI call. Currently, the perf driver in linux guest invokes it for all the standard SBI PMU events. Support the SBI function implementation in KVM as well. Reviewed-by: Anup Patel <anup@brainfault.org> Signed-off-by: Atish Patra <atishp@rivosinc.com> Acked-by: Paul Walmsley <pjw@kernel.org> Link: https://lore.kernel.org/r/20250909-pmu_event_info-v6-7-d8f80cacb884@rivosinc.com Signed-off-by: Anup Patel <anup@brainfault.org>
2025-09-16drivers/perf: riscv: Implement PMU event info functionAtish Patra
With the new SBI PMU event info function, we can query the availability of the all standard SBI PMU events at boot time with a single ecall. This improves the bootime by avoiding making an SBI call for each standard PMU event. Since this function is defined only in SBI v3.0, invoke this only if the underlying SBI implementation is v3.0 or higher. Signed-off-by: Atish Patra <atishp@rivosinc.com> Reviewed-by: Anup Patel <anup@brainfault.org> Acked-by: Paul Walmsley <pjw@kernel.org> Link: https://lore.kernel.org/r/20250909-pmu_event_info-v6-4-d8f80cacb884@rivosinc.com Signed-off-by: Anup Patel <anup@brainfault.org>
2025-09-16drivers/perf: riscv: Add raw event v2 supportAtish Patra
SBI v3.0 introduced a new raw event type that allows wider mhpmeventX width to be programmed via CFG_MATCH. Use the raw event v2 if SBI v3.0 is available. Reviewed-by: Anup Patel <anup@brainfault.org> Signed-off-by: Atish Patra <atishp@rivosinc.com> Acked-by: Paul Walmsley <pjw@kernel.org> Link: https://lore.kernel.org/r/20250909-pmu_event_info-v6-2-d8f80cacb884@rivosinc.com Signed-off-by: Anup Patel <anup@brainfault.org>
2025-09-16RISC-V: KVM: Implement ONE_REG interface for SBI FWFT stateAnup Patel
The KVM user-space needs a way to save/restore the state of SBI FWFT features so implement SBI extension ONE_REG callbacks. Signed-off-by: Anup Patel <apatel@ventanamicro.com> Reviewed-by: Andrew Jones <ajones@ventanamicro.com> Link: https://lore.kernel.org/r/20250823155947.1354229-6-apatel@ventanamicro.com Signed-off-by: Anup Patel <anup@brainfault.org>
2025-09-16RISC-V: KVM: Move copy_sbi_ext_reg_indices() to SBI implementationAnup Patel
The ONE_REG handling of SBI extension enable/disable registers and SBI extension state registers is already under SBI implementation. On similar lines, let's move copy_sbi_ext_reg_indices() under SBI implementation. Signed-off-by: Anup Patel <apatel@ventanamicro.com> Reviewed-by: Andrew Jones <ajones@ventanamicro.com> Link: https://lore.kernel.org/r/20250823155947.1354229-5-apatel@ventanamicro.com Signed-off-by: Anup Patel <anup@brainfault.org>
2025-09-16RISC-V: KVM: Introduce optional ONE_REG callbacks for SBI extensionsAnup Patel
SBI extensions can have per-VCPU state which needs to be saved/restored through ONE_REG interface for Guest/VM migration. Introduce optional ONE_REG callbacks for SBI extensions so that ONE_REG implementation for an SBI extenion is part of the extension sources. Signed-off-by: Anup Patel <apatel@ventanamicro.com> Reviewed-by: Andrew Jones <ajones@ventanamicro.com> Link: https://lore.kernel.org/r/20250823155947.1354229-4-apatel@ventanamicro.com Signed-off-by: Anup Patel <anup@brainfault.org>
2025-09-16RISC-V: KVM: Add support for SBI_FWFT_POINTER_MASKING_PMLENSamuel Holland
Pointer masking is controlled through a WARL field in henvcfg. Expose the feature only if at least one PMLEN value is supported for VS-mode. Allow the VMM to block access to the feature by disabling the Smnpm ISA extension in the guest. Signed-off-by: Samuel Holland <samuel.holland@sifive.com> Reviewed-by: Anup Patel <anup@brainfault.org> Reviewed-by: Andrew Jones <ajones@ventanamicro.com> Link: https://lore.kernel.org/r/20250111004702.2813013-3-samuel.holland@sifive.com Signed-off-by: Anup Patel <anup@brainfault.org>
2025-09-13mm: introduce memdesc_flags_tMatthew Wilcox (Oracle)
Patch series "Add and use memdesc_flags_t". At some point struct page will be separated from struct slab and struct folio. This is a step towards that by introducing a type for the 'flags' word of all three structures. This gives us a certain amount of type safety by establishing that some of these unsigned longs are different from other unsigned longs in that they contain things like node ID, section number and zone number in the upper bits. That lets us have functions that can be easily called by anyone who has a slab, folio or page (but not easily by anyone else) to get the node or zone. There's going to be some unusual merge problems with this as some odd bits of the kernel decide they want to print out the flags value or something similar by writing page->flags and now they'll need to write page->flags.f instead. That's most of the churn here. Maybe we should be removing these things from the debug output? This patch (of 11): Wrap the unsigned long flags in a typedef. In upcoming patches, this will provide a strong hint that you can't just pass a random unsigned long to functions which take this as an argument. [willy@infradead.org: s/flags/flags.f/ in several architectures] Link: https://lkml.kernel.org/r/aKMgPRLD-WnkPxYm@casper.infradead.org [nicola.vetrini@gmail.com: mips: fix compilation error] Link: https://lore.kernel.org/lkml/CA+G9fYvkpmqGr6wjBNHY=dRp71PLCoi2341JxOudi60yqaeUdg@mail.gmail.com/ Link: https://lkml.kernel.org/r/20250825214245.1838158-1-nicola.vetrini@gmail.com Link: https://lkml.kernel.org/r/20250805172307.1302730-1-willy@infradead.org Link: https://lkml.kernel.org/r/20250805172307.1302730-2-willy@infradead.org Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org> Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org> Acked-by: Zi Yan <ziy@nvidia.com> Cc: Shakeel Butt <shakeel.butt@linux.dev> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
2025-09-13riscv: use an atomic xchg in pudp_huge_get_and_clear()Alexandre Ghiti
Make sure we return the right pud value and not a value that could have been overwritten in between by a different core. Link: https://lkml.kernel.org/r/20250814-dev-alex-thp_pud_xchg-v1-1-b4704dfae206@rivosinc.com Fixes: c3cc2a4a3a23 ("riscv: Add support for PUD THP") Signed-off-by: Alexandre Ghiti <alexghiti@rivosinc.com> Cc: Andrew Donnellan <ajd@linux.ibm.com> Cc: <stable@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
2025-09-11Merge git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf after rc5Alexei Starovoitov
Cross-merge BPF and other fixes after downstream PR. No conflicts. Signed-off-by: Alexei Starovoitov <ast@kernel.org>
2025-09-08riscv: Add __attribute_const__ to ffs()-family implementationsKees Cook
While tracking down a problem where constant expressions used by BUILD_BUG_ON() suddenly stopped working[1], we found that an added static initializer was convincing the compiler that it couldn't track the state of the prior statically initialized value. Tracing this down found that ffs() was used in the initializer macro, but since it wasn't marked with __attribute__const__, the compiler had to assume the function might change variable states as a side-effect (which is not true for ffs(), which provides deterministic math results). Add missing __attribute_const__ annotations to RISC-V's implementations of variable__ffs(), variable__fls(), and variable_ffs() functions. These are pure mathematical functions that always return the same result for the same input with no side effects, making them eligible for compiler optimization. Build tested ARCH=riscv defconfig with GCC riscv64-linux-gnu 14.2.0. Link: https://github.com/KSPP/linux/issues/364 [1] Tested-by: Alexandre Ghiti <alexghiti@rivosinc.com> Acked-by: Alexandre Ghiti <alexghiti@rivosinc.com> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Link: https://lore.kernel.org/r/20250804164417.1612371-9-kees@kernel.org Signed-off-by: Kees Cook <kees@kernel.org>
2025-09-08RISC-V: KVM: add support for FWFT SBI extensionClément Léger
Add basic infrastructure to support the FWFT extension in KVM. Signed-off-by: Clément Léger <cleger@rivosinc.com> Reviewed-by: Andrew Jones <ajones@ventanamicro.com> Reviewed-by: Atish Patra <atishp@rivosinc.com> Link: https://lore.kernel.org/r/20250523101932.1594077-14-cleger@rivosinc.com Signed-off-by: Anup Patel <anup@brainfault.org>
2025-09-05riscv: Fix sparse warning about different address spacesAlexandre Ghiti
We did not propagate the __user attribute of the pointers in __get_kernel_nofault() and __put_kernel_nofault(), which results in sparse complaining: >> mm/maccess.c:41:17: sparse: sparse: incorrect type in argument 2 (different address spaces) @@ expected void const [noderef] __user *from @@ got unsigned long long [usertype] * @@ mm/maccess.c:41:17: sparse: expected void const [noderef] __user *from mm/maccess.c:41:17: sparse: got unsigned long long [usertype] * So fix this by correctly casting those pointers. Reported-by: kernel test robot <lkp@intel.com> Closes: https://lore.kernel.org/oe-kbuild-all/202508161713.RWu30Lv1-lkp@intel.com/ Suggested-by: Al Viro <viro@zeniv.linux.org.uk> Fixes: f6bff7827a48 ("riscv: uaccess: use 'asm_goto_output' for get_user()") Cc: stable@vger.kernel.org Signed-off-by: Alexandre Ghiti <alexghiti@rivosinc.com> Reviewed-by: Cyril Bur <cyrilbur@tenstorrent.com> Link: https://lore.kernel.org/r/20250903-dev-alex-sparse_warnings_v1-v1-2-7e6350beb700@rivosinc.com Signed-off-by: Paul Walmsley <pjw@kernel.org>
2025-09-05riscv: Fix sparse warning in __get_user_error()Alexandre Ghiti
We used to assign 0 to x without an appropriate cast which results in sparse complaining when x is a pointer: >> block/ioctl.c:72:39: sparse: sparse: Using plain integer as NULL pointer So fix this by casting 0 to the correct type of x. Reported-by: kernel test robot <lkp@intel.com> Closes: https://lore.kernel.org/oe-kbuild-all/202508062321.gHv4kvuY-lkp@intel.com/ Fixes: f6bff7827a48 ("riscv: uaccess: use 'asm_goto_output' for get_user()") Cc: stable@vger.kernel.org Signed-off-by: Alexandre Ghiti <alexghiti@rivosinc.com> Reviewed-by: Clément Léger <cleger@rivosinc.com> Reviewed-by: Cyril Bur <cyrilbur@tenstorrent.com> Link: https://lore.kernel.org/r/20250903-dev-alex-sparse_warnings_v1-v1-1-7e6350beb700@rivosinc.com Signed-off-by: Paul Walmsley <pjw@kernel.org>
2025-09-05riscv: use lw when reading int cpu in asm_per_cpuRadim Krčmář
REG_L is wrong, because thread_info.cpu is 32-bit, not xlen-bit wide. The struct currently has a hole after cpu, so little endian accesses seemed fine. Fixes: be97d0db5f44 ("riscv: VMAP_STACK overflow detection thread-safe") Cc: stable@vger.kernel.org Reviewed-by: Alexandre Ghiti <alexghiti@rivosinc.com> Signed-off-by: Radim Krčmář <rkrcmar@ventanamicro.com> Link: https://lore.kernel.org/r/20250725165410.2896641-5-rkrcmar@ventanamicro.com Signed-off-by: Paul Walmsley <pjw@kernel.org>
2025-09-05riscv: uaccess: fix __put_user_nocheck for unaligned accessesAurelien Jarno
The type of the value to write should be determined by the size of the destination, not by the value itself, which may be a constant. This aligns the behavior with x86_64, where __typeof__(*(__gu_ptr)) is used to infer the correct type. This fixes an issue in put_cmsg, which was only writing 4 out of 8 bytes to the cmsg_len field, causing the glibc tst-socket-timestamp test to fail. Fixes: ca1a66cdd685 ("riscv: uaccess: do not do misaligned accesses in get/put_user()") Signed-off-by: Aurelien Jarno <aurelien@aurel32.net> Reviewed-by: Alexandre Ghiti <alexghiti@rivosinc.com> Cc: stable@vger.kernel.org Link: https://lore.kernel.org/r/20250724220853.1969954-1-aurelien@aurel32.net Signed-off-by: Paul Walmsley <pjw@kernel.org>
2025-08-15riscv: Separate toolchain support dependency from RISCV_ISA_ZACASPu Lehui
RV64 bpf is going to support ZACAS instructions. Let's separate toolchain support dependency from RISCV_ISA_ZACAS. Signed-off-by: Pu Lehui <pulehui@huawei.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Tested-by: Björn Töpel <bjorn@rivosinc.com> Reviewed-by: Björn Töpel <bjorn@rivosinc.com> Acked-by: Björn Töpel <bjorn@kernel.org> Link: https://lore.kernel.org/bpf/20250719091730.2660197-5-pulehui@huaweicloud.com
2025-08-03Merge tag 'rust-6.17' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/ojeda/linux Pull Rust updates from Miguel Ojeda: "Toolchain and infrastructure: - Enable a set of Clippy lints: 'ptr_as_ptr', 'ptr_cast_constness', 'as_ptr_cast_mut', 'as_underscore', 'cast_lossless' and 'ref_as_ptr' These are intended to avoid type casts with the 'as' operator, which are quite powerful, into restricted variants that are less powerful and thus should help to avoid mistakes - Remove the 'author' key now that most instances were moved to the plural one in the previous cycle 'kernel' crate: - New 'bug' module: add 'warn_on!' macro which reuses the existing 'BUG'/'WARN' infrastructure, i.e. it respects the usual sysctls and kernel parameters: warn_on!(value == 42); To avoid duplicating the assembly code, the same strategy is followed as for the static branch code in order to share the assembly between both C and Rust This required a few rearrangements on C arch headers -- the existing C macros should still generate the same outputs, thus no functional change expected there - 'workqueue' module: add delayed work items, including a 'DelayedWork' struct, a 'impl_has_delayed_work!' macro and an 'enqueue_delayed' method, e.g.: /// Enqueue the struct for execution on the system workqueue, /// where its value will be printed 42 jiffies later. fn print_later(value: Arc<MyStruct>) { let _ = workqueue::system().enqueue_delayed(value, 42); } - New 'bits' module: add support for 'bit' and 'genmask' functions, with runtime- and compile-time variants, e.g.: static_assert!(0b00010000 == bit_u8(4)); static_assert!(0b00011110 == genmask_u8(1..=4)); assert!(checked_bit_u32(u32::BITS).is_none()); - 'uaccess' module: add 'UserSliceReader::strcpy_into_buf', which reads NUL-terminated strings from userspace into a '&CStr' Introduce 'UserPtr' newtype, similar in purpose to '__user' in C, to minimize mistakes handling userspace pointers, including mixing them up with integers and leaking them via the 'Debug' trait. Add it to the prelude, too - Start preparations for the replacement of our custom 'CStr' type with the analogous type in the 'core' standard library. This will take place across several cycles to make it easier. For this one, it includes a new 'fmt' module, using upstream method names and some other cleanups Replace 'fmt!' with a re-export, which helps Clippy lint properly, and clean up the found 'uninlined-format-args' instances - 'dma' module: - Clarify wording and be consistent in 'coherent' nomenclature - Convert the 'read!()' and 'write!()' macros to return a 'Result' - Add 'as_slice()', 'write()' methods in 'CoherentAllocation' - Expose 'count()' and 'size()' in 'CoherentAllocation' and add the corresponding type invariants - Implement 'CoherentAllocation::dma_handle_with_offset()' - 'time' module: - Make 'Instant' generic over clock source. This allows the compiler to assert that arithmetic expressions involving the 'Instant' use 'Instants' based on the same clock source - Make 'HrTimer' generic over the timer mode. 'HrTimer' timers take a 'Duration' or an 'Instant' when setting the expiry time, depending on the timer mode. With this change, the compiler can check the type matches the timer mode - Add an abstraction for 'fsleep'. 'fsleep' is a flexible sleep function that will select an appropriate sleep method depending on the requested sleep time - Avoid 64-bit divisions on 32-bit hardware when calculating timestamps - Seal the 'HrTimerMode' trait. This prevents users of the 'HrTimerMode' from implementing the trait on their own types - Pass the correct timer mode ID to 'hrtimer_start_range_ns()' - 'list' module: remove 'OFFSET' constants, allowing to remove pointer arithmetic; now 'impl_list_item!' invokes 'impl_has_list_links!' or 'impl_has_list_links_self_ptr!'. Other simplifications too - 'types' module: remove 'ForeignOwnable::PointedTo' in favor of a constant, which avoids exposing the type of the opaque pointer, and require 'into_foreign' to return non-null Remove the 'Either<L, R>' type as well. It is unused, and we want to encourage the use of custom enums for concrete use cases - 'sync' module: implement 'Borrow' and 'BorrowMut' for 'Arc' types to allow them to be used in generic APIs - 'alloc' module: implement 'Borrow' and 'BorrowMut' for 'Box<T, A>'; and 'Borrow', 'BorrowMut' and 'Default' for 'Vec<T, A>' - 'Opaque' type: add 'cast_from' method to perform a restricted cast that cannot change the inner type and use it in callers of 'container_of!'. Rename 'raw_get' to 'cast_into' to match it - 'rbtree' module: add 'is_empty' method - 'sync' module: new 'aref' submodule to hold 'AlwaysRefCounted' and 'ARef', which are moved from the too general 'types' module which we want to reduce or eventually remove. Also fix a safety comment in 'static_lock_class' 'pin-init' crate: - Add 'impl<T, E> [Pin]Init<T, E> for Result<T, E>', so results are now (pin-)initializers - Add 'Zeroable::init_zeroed()' that delegates to 'init_zeroed()' - New 'zeroed()', a safe version of 'mem::zeroed()' and also provide it via 'Zeroable::zeroed()' - Implement 'Zeroable' for 'Option<&T>', 'Option<&mut T>' and for 'Option<[unsafe] [extern "abi"] fn(...args...) -> ret>' for '"Rust"' and '"C"' ABIs and up to 20 arguments - Changed blanket impls of 'Init' and 'PinInit' from 'impl<T, E> [Pin]Init<T, E> for T' to 'impl<T> [Pin]Init<T> for T' - Renamed 'zeroed()' to 'init_zeroed()' - Upstream dev news: improve CI more to deny warnings, use '--all-targets'. Check the synchronization status of the two '-next' branches in upstream and the kernel MAINTAINERS: - Add Vlastimil Babka, Liam R. Howlett, Uladzislau Rezki and Lorenzo Stoakes as reviewers (thanks everyone) And a few other cleanups and improvements" * tag 'rust-6.17' of git://git.kernel.org/pub/scm/linux/kernel/git/ojeda/linux: (76 commits) rust: Add warn_on macro arm64/bug: Add ARCH_WARN_ASM macro for BUG/WARN asm code sharing with Rust riscv/bug: Add ARCH_WARN_ASM macro for BUG/WARN asm code sharing with Rust x86/bug: Add ARCH_WARN_ASM macro for BUG/WARN asm code sharing with Rust rust: kernel: move ARef and AlwaysRefCounted to sync::aref rust: sync: fix safety comment for `static_lock_class` rust: types: remove `Either<L, R>` rust: kernel: use `core::ffi::CStr` method names rust: str: add `CStr` methods matching `core::ffi::CStr` rust: str: remove unnecessary qualification rust: use `kernel::{fmt,prelude::fmt!}` rust: kernel: add `fmt` module rust: kernel: remove `fmt!`, fix clippy::uninlined-format-args scripts: rust: emit path candidates in panic message scripts: rust: replace length checks with match rust: list: remove nonexistent generic parameter in link rust: bits: add support for bits/genmask macros rust: list: remove OFFSET constants rust: list: add `impl_list_item!` examples rust: list: use fully qualified path ...
2025-08-01Merge tag 'bpf-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpfLinus Torvalds
Pull bpf fixes from Alexei Starovoitov: - Fix kCFI failures in JITed BPF code on arm64 (Sami Tolvanen, Puranjay Mohan, Mark Rutland, Maxwell Bland) - Disallow tail calls between BPF programs that use different cgroup local storage maps to prevent out-of-bounds access (Daniel Borkmann) - Fix unaligned access in flow_dissector and netfilter BPF programs (Paul Chaignon) - Avoid possible use of uninitialized mod_len in libbpf (Achill Gilgenast) * tag 'bpf-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf: selftests/bpf: Test for unaligned flow_dissector ctx access bpf: Improve ctx access verifier error message bpf: Check netfilter ctx accesses are aligned bpf: Check flow_dissector ctx accesses are aligned arm64/cfi,bpf: Support kCFI + BPF on arm64 cfi: Move BPF CFI types and helpers to generic code cfi: add C CFI type macro libbpf: Avoid possible use of uninitialized mod_len bpf: Fix oob access in cgroup local storage bpf: Move cgroup iterator helpers to bpf.h bpf: Move bpf map owner out of common struct bpf: Add cookie object to bpf maps
2025-07-31cfi: Move BPF CFI types and helpers to generic codeSami Tolvanen
Instead of duplicating the same code for each architecture, move the CFI type hash variables for BPF function types and related helper functions to generic CFI code, and allow architectures to override the function definitions if needed. Signed-off-by: Sami Tolvanen <samitolvanen@google.com> Link: https://lore.kernel.org/r/20250801001004.1859976-7-samitolvanen@google.com Signed-off-by: Alexei Starovoitov <ast@kernel.org>
2025-07-31Merge tag 'mm-stable-2025-07-30-15-25' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm Pull MM updates from Andrew Morton: "As usual, many cleanups. The below blurbiage describes 42 patchsets. 21 of those are partially or fully cleanup work. "cleans up", "cleanup", "maintainability", "rationalizes", etc. I never knew the MM code was so dirty. "mm: ksm: prevent KSM from breaking merging of new VMAs" (Lorenzo Stoakes) addresses an issue with KSM's PR_SET_MEMORY_MERGE mode: newly mapped VMAs were not eligible for merging with existing adjacent VMAs. "mm/damon: introduce DAMON_STAT for simple and practical access monitoring" (SeongJae Park) adds a new kernel module which simplifies the setup and usage of DAMON in production environments. "stop passing a writeback_control to swap/shmem writeout" (Christoph Hellwig) is a cleanup to the writeback code which removes a couple of pointers from struct writeback_control. "drivers/base/node.c: optimization and cleanups" (Donet Tom) contains largely uncorrelated cleanups to the NUMA node setup and management code. "mm: userfaultfd: assorted fixes and cleanups" (Tal Zussman) does some maintenance work on the userfaultfd code. "Readahead tweaks for larger folios" (Ryan Roberts) implements some tuneups for pagecache readahead when it is reading into order>0 folios. "selftests/mm: Tweaks to the cow test" (Mark Brown) provides some cleanups and consistency improvements to the selftests code. "Optimize mremap() for large folios" (Dev Jain) does that. A 37% reduction in execution time was measured in a memset+mremap+munmap microbenchmark. "Remove zero_user()" (Matthew Wilcox) expunges zero_user() in favor of the more modern memzero_page(). "mm/huge_memory: vmf_insert_folio_*() and vmf_insert_pfn_pud() fixes" (David Hildenbrand) addresses some warts which David noticed in the huge page code. These were not known to be causing any issues at this time. "mm/damon: use alloc_migrate_target() for DAMOS_MIGRATE_{HOT,COLD" (SeongJae Park) provides some cleanup and consolidation work in DAMON. "use vm_flags_t consistently" (Lorenzo Stoakes) uses vm_flags_t in places where we were inappropriately using other types. "mm/memfd: Reserve hugetlb folios before allocation" (Vivek Kasireddy) increases the reliability of large page allocation in the memfd code. "mm: Remove pXX_devmap page table bit and pfn_t type" (Alistair Popple) removes several now-unneeded PFN_* flags. "mm/damon: decouple sysfs from core" (SeongJae Park) implememnts some cleanup and maintainability work in the DAMON sysfs layer. "madvise cleanup" (Lorenzo Stoakes) does quite a lot of cleanup/maintenance work in the madvise() code. "madvise anon_name cleanups" (Vlastimil Babka) provides additional cleanups on top or Lorenzo's effort. "Implement numa node notifier" (Oscar Salvador) creates a standalone notifier for NUMA node memory state changes. Previously these were lumped under the more general memory on/offline notifier. "Make MIGRATE_ISOLATE a standalone bit" (Zi Yan) cleans up the pageblock isolation code and fixes a potential issue which doesn't seem to cause any problems in practice. "selftests/damon: add python and drgn based DAMON sysfs functionality tests" (SeongJae Park) adds additional drgn- and python-based DAMON selftests which are more comprehensive than the existing selftest suite. "Misc rework on hugetlb faulting path" (Oscar Salvador) fixes a rather obscure deadlock in the hugetlb fault code and follows that fix with a series of cleanups. "cma: factor out allocation logic from __cma_declare_contiguous_nid" (Mike Rapoport) rationalizes and cleans up the highmem-specific code in the CMA allocator. "mm/migration: rework movable_ops page migration (part 1)" (David Hildenbrand) provides cleanups and future-preparedness to the migration code. "mm/damon: add trace events for auto-tuned monitoring intervals and DAMOS quota" (SeongJae Park) adds some tracepoints to some DAMON auto-tuning code. "mm/damon: fix misc bugs in DAMON modules" (SeongJae Park) does that. "mm/damon: misc cleanups" (SeongJae Park) also does what it claims. "mm: folio_pte_batch() improvements" (David Hildenbrand) cleans up the large folio PTE batching code. "mm/damon/vaddr: Allow interleaving in migrate_{hot,cold} actions" (SeongJae Park) facilitates dynamic alteration of DAMON's inter-node allocation policy. "Remove unmap_and_put_page()" (Vishal Moola) provides a couple of page->folio conversions. "mm: per-node proactive reclaim" (Davidlohr Bueso) implements a per-node control of proactive reclaim - beyond the current memcg-based implementation. "mm/damon: remove damon_callback" (SeongJae Park) replaces the damon_callback interface with a more general and powerful damon_call()+damos_walk() interface. "mm/mremap: permit mremap() move of multiple VMAs" (Lorenzo Stoakes) implements a number of mremap cleanups (of course) in preparation for adding new mremap() functionality: newly permit the remapping of multiple VMAs when the user is specifying MREMAP_FIXED. It still excludes some specialized situations where this cannot be performed reliably. "drop hugetlb_free_pgd_range()" (Anthony Yznaga) switches some sparc hugetlb code over to the generic version and removes the thus-unneeded hugetlb_free_pgd_range(). "mm/damon/sysfs: support periodic and automated stats update" (SeongJae Park) augments the present userspace-requested update of DAMON sysfs monitoring files. Automatic update is now provided, along with a tunable to control the update interval. "Some randome fixes and cleanups to swapfile" (Kemeng Shi) does what is claims. "mm: introduce snapshot_page" (Luiz Capitulino and David Hildenbrand) provides (and uses) a means by which debug-style functions can grab a copy of a pageframe and inspect it locklessly without tripping over the races inherent in operating on the live pageframe directly. "use per-vma locks for /proc/pid/maps reads" (Suren Baghdasaryan) addresses the large contention issues which can be triggered by reads from that procfs file. Latencies are reduced by more than half in some situations. The series also introduces several new selftests for the /proc/pid/maps interface. "__folio_split() clean up" (Zi Yan) cleans up __folio_split()! "Optimize mprotect() for large folios" (Dev Jain) provides some quite large (>3x) speedups to mprotect() when dealing with large folios. "selftests/mm: reuse FORCE_READ to replace "asm volatile("" : "+r" (XXX));" and some cleanup" (wang lian) does some cleanup work in the selftests code. "tools/testing: expand mremap testing" (Lorenzo Stoakes) extends the mremap() selftest in several ways, including adding more checking of Lorenzo's recently added "permit mremap() move of multiple VMAs" feature. "selftests/damon/sysfs.py: test all parameters" (SeongJae Park) extends the DAMON sysfs interface selftest so that it tests all possible user-requested parameters. Rather than the present minimal subset" * tag 'mm-stable-2025-07-30-15-25' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm: (370 commits) MAINTAINERS: add missing headers to mempory policy & migration section MAINTAINERS: add missing file to cgroup section MAINTAINERS: add MM MISC section, add missing files to MISC and CORE MAINTAINERS: add missing zsmalloc file MAINTAINERS: add missing files to page alloc section MAINTAINERS: add missing shrinker files MAINTAINERS: move memremap.[ch] to hotplug section MAINTAINERS: add missing mm_slot.h file THP section MAINTAINERS: add missing interval_tree.c to memory mapping section MAINTAINERS: add missing percpu-internal.h file to per-cpu section mm/page_alloc: remove trace_mm_alloc_contig_migrate_range_info() selftests/damon: introduce _common.sh to host shared function selftests/damon/sysfs.py: test runtime reduction of DAMON parameters selftests/damon/sysfs.py: test non-default parameters runtime commit selftests/damon/sysfs.py: generalize DAMON context commit assertion selftests/damon/sysfs.py: generalize monitoring attributes commit assertion selftests/damon/sysfs.py: generalize DAMOS schemes commit assertion selftests/damon/sysfs.py: test DAMOS filters commitment selftests/damon/sysfs.py: generalize DAMOS scheme commit assertion selftests/damon/sysfs.py: test DAMOS destinations commitment ...
2025-07-30Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvmLinus Torvalds
Pull kvm updates from Paolo Bonzini: "ARM: - Host driver for GICv5, the next generation interrupt controller for arm64, including support for interrupt routing, MSIs, interrupt translation and wired interrupts - Use FEAT_GCIE_LEGACY on GICv5 systems to virtualize GICv3 VMs on GICv5 hardware, leveraging the legacy VGIC interface - Userspace control of the 'nASSGIcap' GICv3 feature, allowing userspace to disable support for SGIs w/o an active state on hardware that previously advertised it unconditionally - Map supporting endpoints with cacheable memory attributes on systems with FEAT_S2FWB and DIC where KVM no longer needs to perform cache maintenance on the address range - Nested support for FEAT_RAS and FEAT_DoubleFault2, allowing the guest hypervisor to inject external aborts into an L2 VM and take traps of masked external aborts to the hypervisor - Convert more system register sanitization to the config-driven implementation - Fixes to the visibility of EL2 registers, namely making VGICv3 system registers accessible through the VGIC device instead of the ONE_REG vCPU ioctls - Various cleanups and minor fixes LoongArch: - Add stat information for in-kernel irqchip - Add tracepoints for CPUCFG and CSR emulation exits - Enhance in-kernel irqchip emulation - Various cleanups RISC-V: - Enable ring-based dirty memory tracking - Improve perf kvm stat to report interrupt events - Delegate illegal instruction trap to VS-mode - MMU improvements related to upcoming nested virtualization s390x - Fixes x86: - Add CONFIG_KVM_IOAPIC for x86 to allow disabling support for I/O APIC, PIC, and PIT emulation at compile time - Share device posted IRQ code between SVM and VMX and harden it against bugs and runtime errors - Use vcpu_idx, not vcpu_id, for GA log tag/metadata, to make lookups O(1) instead of O(n) - For MMIO stale data mitigation, track whether or not a vCPU has access to (host) MMIO based on whether the page tables have MMIO pfns mapped; using VFIO is prone to false negatives - Rework the MSR interception code so that the SVM and VMX APIs are more or less identical - Recalculate all MSR intercepts from scratch on MSR filter changes, instead of maintaining shadow bitmaps - Advertise support for LKGS (Load Kernel GS base), a new instruction that's loosely related to FRED, but is supported and enumerated independently - Fix a user-triggerable WARN that syzkaller found by setting the vCPU in INIT_RECEIVED state (aka wait-for-SIPI), and then putting the vCPU into VMX Root Mode (post-VMXON). Trying to detect every possible path leading to architecturally forbidden states is hard and even risks breaking userspace (if it goes from valid to valid state but passes through invalid states), so just wait until KVM_RUN to detect that the vCPU state isn't allowed - Add KVM_X86_DISABLE_EXITS_APERFMPERF to allow disabling interception of APERF/MPERF reads, so that a "properly" configured VM can access APERF/MPERF. This has many caveats (APERF/MPERF cannot be zeroed on vCPU creation or saved/restored on suspend and resume, or preserved over thread migration let alone VM migration) but can be useful whenever you're interested in letting Linux guests see the effective physical CPU frequency in /proc/cpuinfo - Reject KVM_SET_TSC_KHZ for vm file descriptors if vCPUs have been created, as there's no known use case for changing the default frequency for other VM types and it goes counter to the very reason why the ioctl was added to the vm file descriptor. And also, there would be no way to make it work for confidential VMs with a "secure" TSC, so kill two birds with one stone - Dynamically allocation the shadow MMU's hashed page list, and defer allocating the hashed list until it's actually needed (the TDP MMU doesn't use the list) - Extract many of KVM's helpers for accessing architectural local APIC state to common x86 so that they can be shared by guest-side code for Secure AVIC - Various cleanups and fixes x86 (Intel): - Preserve the host's DEBUGCTL.FREEZE_IN_SMM when running the guest. Failure to honor FREEZE_IN_SMM can leak host state into guests - Explicitly check vmcs12.GUEST_DEBUGCTL on nested VM-Enter to prevent L1 from running L2 with features that KVM doesn't support, e.g. BTF x86 (AMD): - WARN and reject loading kvm-amd.ko instead of panicking the kernel if the nested SVM MSRPM offsets tracker can't handle an MSR (which is pretty much a static condition and therefore should never happen, but still) - Fix a variety of flaws and bugs in the AVIC device posted IRQ code - Inhibit AVIC if a vCPU's ID is too big (relative to what hardware supports) instead of rejecting vCPU creation - Extend enable_ipiv module param support to SVM, by simply leaving IsRunning clear in the vCPU's physical ID table entry - Disable IPI virtualization, via enable_ipiv, if the CPU is affected by erratum #1235, to allow (safely) enabling AVIC on such CPUs - Request GA Log interrupts if and only if the target vCPU is blocking, i.e. only if KVM needs a notification in order to wake the vCPU - Intercept SPEC_CTRL on AMD if the MSR shouldn't exist according to the vCPU's CPUID model - Accept any SNP policy that is accepted by the firmware with respect to SMT and single-socket restrictions. An incompatible policy doesn't put the kernel at risk in any way, so there's no reason for KVM to care - Drop a superfluous WBINVD (on all CPUs!) when destroying a VM and use WBNOINVD instead of WBINVD when possible for SEV cache maintenance - When reclaiming memory from an SEV guest, only do cache flushes on CPUs that have ever run a vCPU for the guest, i.e. don't flush the caches for CPUs that can't possibly have cache lines with dirty, encrypted data Generic: - Rework irqbypass to track/match producers and consumers via an xarray instead of a linked list. Using a linked list leads to O(n^2) insertion times, which is hugely problematic for use cases that create large numbers of VMs. Such use cases typically don't actually use irqbypass, but eliminating the pointless registration is a future problem to solve as it likely requires new uAPI - Track irqbypass's "token" as "struct eventfd_ctx *" instead of a "void *", to avoid making a simple concept unnecessarily difficult to understand - Decouple device posted IRQs from VFIO device assignment, as binding a VM to a VFIO group is not a requirement for enabling device posted IRQs - Clean up and document/comment the irqfd assignment code - Disallow binding multiple irqfds to an eventfd with a priority waiter, i.e. ensure an eventfd is bound to at most one irqfd through the entire host, and add a selftest to verify eventfd:irqfd bindings are globally unique - Add a tracepoint for KVM_SET_MEMORY_ATTRIBUTES to help debug issues related to private <=> shared memory conversions - Drop guest_memfd's .getattr() implementation as the VFS layer will call generic_fillattr() if inode_operations.getattr is NULL - Fix issues with dirty ring harvesting where KVM doesn't bound the processing of entries in any way, which allows userspace to keep KVM in a tight loop indefinitely - Kill off kvm_arch_{start,end}_assignment() and x86's associated tracking, now that KVM no longer uses assigned_device_count as a heuristic for either irqbypass usage or MDS mitigation Selftests: - Fix a comment typo - Verify KVM is loaded when getting any KVM module param so that attempting to run a selftest without kvm.ko loaded results in a SKIP message about KVM not being loaded/enabled (versus some random parameter not existing) - Skip tests that hit EACCES when attempting to access a file, and print a "Root required?" help message. In most cases, the test just needs to be run with elevated permissions" * tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm: (340 commits) Documentation: KVM: Use unordered list for pre-init VGIC registers RISC-V: KVM: Avoid re-acquiring memslot in kvm_riscv_gstage_map() RISC-V: KVM: Use find_vma_intersection() to search for intersecting VMAs RISC-V: perf/kvm: Add reporting of interrupt events RISC-V: KVM: Enable ring-based dirty memory tracking RISC-V: KVM: Fix inclusion of Smnpm in the guest ISA bitmap RISC-V: KVM: Delegate illegal instruction fault to VS mode RISC-V: KVM: Pass VMID as parameter to kvm_riscv_hfence_xyz() APIs RISC-V: KVM: Factor-out g-stage page table management RISC-V: KVM: Add vmid field to struct kvm_riscv_hfence RISC-V: KVM: Introduce struct kvm_gstage_mapping RISC-V: KVM: Factor-out MMU related declarations into separate headers RISC-V: KVM: Use ncsr_xyz() in kvm_riscv_vcpu_trap_redirect() RISC-V: KVM: Implement kvm_arch_flush_remote_tlbs_range() RISC-V: KVM: Don't flush TLB when PTE is unchanged RISC-V: KVM: Replace KVM_REQ_HFENCE_GVMA_VMID_ALL with KVM_REQ_TLB_FLUSH RISC-V: KVM: Rename and move kvm_riscv_local_tlb_sanitize() RISC-V: KVM: Drop the return value of kvm_riscv_vcpu_aia_init() RISC-V: KVM: Check kvm_riscv_vcpu_alloc_vector_context() return value KVM: arm64: selftests: Add FEAT_RAS EL2 registers to get-reg-list ...
generated by cgit (git 2.34.1) at 2025-10-09 22:10:18 +0000