kernel/git/stable/linux-stable.git/drivers/s390, branch master

s390/zcrypt: Remove the empty file

2026-07-08T15:02:47+00:00

The files has no real user because CEX2 and CEX3 device drivers are removed, also remove these empty files. Fixes: 5ac8c72462cd ("s390/zcrypt: remove CEX2 and CEX3 device drivers") Signed-off-by: Rongguang Wei Reviewed-by: Holger Dengler Signed-off-by: Vasily Gorbik

Merge tag 's390-7.2-3' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux

2026-07-04T16:28:45+00:00

Pull s390 fixes from Vasily Gorbik: - Fix PKEY_VERIFYPROTK ioctl key type handling by removing the generic key-length based type check with its wrong bit-size calculation, and leaving protected key verification to the pkey handler - Fix monwriter buffer reuse by rejecting records that change the data length, preventing out of bounds user copy into the kernel buffer * tag 's390-7.2-3' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux: s390/monwriter: Reject buffer reuse with different data length pkey: Move keytype check from pkey api to handler

Replace by more specific (c files)

2026-07-03T05:38:17+00:00

Replace the #include of by the more specific where applicable. For most cases the include can be dropped completely, only a few drivers need one or two headers added. Acked-by: Danilo Krummrich Acked-by: Takashi Sakamoto Acked-by: Bjorn Helgaas Link: https://patch.msgid.link/1a3f2007c5c5dcf555c09a4035ce3ae8ef1b6c49.1782808461.git.u.kleine-koenig@baylibre.com Signed-off-by: Uwe Kleine-König (The Capable Hub)

s390/monwriter: Reject buffer reuse with different data length

2026-07-02T14:51:06+00:00

When data buffers are reused, e.g. for interval sample records, the first record determines the data length, and the size of the buffer for user copy. Current monwriter code does not check if the data length was changed for subsequent records, which also would never happen for valid user programs. However, a malicious user could change the data length, resulting in out of bounds user copy to the kernel buffer, and memory corruption. By default, the monwriter misc device is created with root-only permissions, so practical impact is typically low. Fix this by checking for changed data length and rejecting such records. Cc: stable@vger.kernel.org Signed-off-by: Gerald Schaefer Reviewed-by: Christian Borntraeger Signed-off-by: Vasily Gorbik

pkey: Move keytype check from pkey api to handler

2026-07-01T15:10:53+00:00

The PKEY_VERIFYPROTK ioctl takes data from user-space and verifies the contained protected key. While checking the integrity of the ioctl request structure is the responsibility of the generic pkey_api code, the verification of the contained protected key is the responsibility of the pkey handler. The keytype verification (based on the calculated bitsize of the key) is part of the protected key verification and therefore the responsibility of the pkey handler (which already verifies it). Therefore the keytype verification is removed from the generic pkey_api code. As the calculation of the key bitsize is currently wrong, the removal of the keytype check in pkey_api also removes this wrong calculation. For this reason, the commit is flagged with the Fixes: tag. Cc: stable@kernel.org # 6.12+ Fixes: 8fcc231ce3be ("s390/pkey: Introduce pkey base with handler registry and handler modules") Reviewed-by: Ingo Franzki Reviewed-by: Harald Freudenberger Signed-off-by: Holger Dengler Signed-off-by: Alexander Gordeev Signed-off-by: Vasily Gorbik

Merge tag 's390-7.2-2' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux

2026-06-22T14:43:48+00:00

Pull more s390 updates from Alexander Gordeev: - consolidate s390 idle time accounting by moving all CPU time tracking to the architecture backend and eliminate the mix of architecture- specific and common code accounting - Add missing EXPORT_SYMBOL_GPL() to kcpustat_field_idle() and kcpustat_field_iowait() functions - Finalize ptep_get() conversion by replacing direct page table entry dereferencing with proper accessors (ptep_get(), pmdp_get(), etc.) - Explicitly check the buffer length in PKEY_VERIFYPROTK ioctl and pkey_pckmo implementations and fail if the length is exceeded * tag 's390-7.2-2' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux: s390/pkey: Check length in pkey_pckmo handler implementation s390/pkey: Check length in PKEY_VERIFYPROTK ioctl s390/idle: Add missing EXPORT_SYMBOL_GPL() s390/mm: Complete ptep_get() conversion s390/idle: Remove idle time and count sysfs files s390/idle: Provide arch specific kcpustat_field_idle()/kcpustat_field_iowait() s390/irq/idle: Use stcke instead of stckf for time stamps s390/timex: Move union tod_clock type to separate header

Merge tag 'mm-stable-2026-06-18-09-26' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

2026-06-19T17:14:34+00:00

Pull MM updates from Andrew Morton: - "selftests/mm: clean up build output and verbosity" (Li Wang) Remove some noise from the MM selftests build - "mm: Free contiguous order-0 pages efficiently" (Ryan Roberts) Speed up the freeing of a batch of 0-order pages by first scanning them for coalescing opportunities. This is applicable to vfree() and to the releasing of frozen pages - "mm/damon: introduce DAMOS failed region quota charge ratio" (SeongJae Park) Address a DAMOS usability issue: The DAMOS quota often exhausts prematurely because it charges for all memory attempted, causing slow and inconsistent performance when actions fail on unreclaimable memory. To fix this, a new feature lets users set a smaller, flexible quota charge ratio (via a numerator and denominator) for failed regions. Since failed actions cause less overhead, reducing their quota cost ensures more predictable and efficient DAMOS processing - "selftests/cgroup: improve zswap tests robustness and support large page sizes" (Li Wang) Fix various spurious failures and improves the overall robustness of the cgroup zswap selftests - "fix MAP_DROPPABLE not supported errno" (Anthony Yznaga) Fix an issue in the mlock selftests on arm32 - "mm: huge_memory: clean up defrag sysfs with shared" (Breno Leitao) Some maintenance work in the huge_memory code - "treewide: fixup gfp_t printks" (Brendan Jackman) Use the special vprintf() gfp_t conversion in various places - "mm: Fix vmemmap optimization accounting and initialization" (Muchun Song) Fix several bugs in the vmemmap optimization, mainly around incorrect page accounting and memmap initialization in the DAX and memory hotplug paths. It also fixes pageblock migratetype initialization and struct page initialization for ZONE_DEVICE compound pages - "mm/damon: repost non-hotfix reviewed patches in damon/next tree" A sprinkle of unrelated minor bugfixes for DAMON - "mm: remove page_mapped()" (David Hildenbrand) Remove this function from the tree, replacing it with folio_mapped() - "mm/damon: let DAMON be paused and resumed" (SeongJae Park) Allow DAMON to be paused and resumed without losing its current state - "kasan: hw_tags: Disable tagging for stack and page-tables" (Muhammad Usama Anjum) Simplify and speed up kasan by removing its ineffective tagging of stacks and page tables - "mm/damon/reclaim,lru_sort: monitor all system rams by default" (SeongJae Park) Simplify deployment on diverse hardware like NUMA systems by updating DAMON_RECLAIM and DAMON_LRU_SORT to automatically monitor the physical address range covering all System RAM areas by default, replacing the overly restrictive behavior that only targeted the single largest memory block to save on negligible overhead - "mm/damon/sysfs: document filters/ directory as deprecated" (SeongJae Park) Update some DAMON docs - "mm: use spinlock guards for zone lock" (Dmitry Ilvokhin) Switch zone->lock handling over to using the guard() mechanisms - "mm/filemap: tighten mmap_miss hit accounting" (fujunjie) Fix a flaw where the mmap_miss counter over-credited page cache hits during fault-arounds and page-fault retries. This results in significant reduction of redundant synchronous mmap readahead I/O, drastically cutting down execution time and gigabytes read for sparse random or strided memory access workloads - "selftests/cgroup: Fix false positive failures in test_percpu_basic" (Li Wang) Fix a couple of false-positives in the cgroup kmem selftests - "mm/damon/reclaim: support monitoring intervals auto-tuning" (SeongJae Park) Add a new parameter to DAMON permitting DAMON_RECLAIM to automatically tune DAMON's sampling and aggregation intervals - "mm/damon/stat: add kdamond_pid parameter" (SeongJae Park) Change DAMON_STAT to provide the pid of its kdamond - "mm/kmemleak: dedupe verbose scan output" (Breno Leitao) Remove large amounts of duplicated backtraces from the verbose-mode kmemleak output - "mm: remove CONFIG_HAVE_BOOTMEM_INFO_NODE (Part 1)" (David Hildenbrand) Reduce our use of CONFIG_HAVE_BOOTMEM_INFO_NODE, with a view to removing it entirely in a later series - "mm/damon: validate min_region_size to be power of 2" (Liew Rui Yan) Prevent users from passing a non-power-of-2 value of `addr_unit', as this later results in undesirable behavior - "mm: document read_pages and simplify usage" (Frederick Mayle) - "tools/mm/page-types: Fix misc bugs" (Ye Liu) Fix three issues in tools/mm/page-types.c - "mm: misc cleanups from __GFP_UNMAPPED series" (Brendan Jackman) Implement several cleanups in the page allocator and related code - "mm, swap: swap table phase IV: unify allocation" (Kairui Song) Unify the allocation and charging of anon and shmem swap in folios, provides better synchronization, consolidates the metadata management, hence dropping the static array and map, and improves performance - "mm/damon: introduce data attributes monitoring" (SeongJae Park( Extend DAMON to monitor general data attributes other than accesses - "mm/vmalloc: free unused pages on vrealloc() shrink" (Shivam Kalra) Implement the TODO in vrealloc() to unmap and free unused pages when shrinking across a page boundary - "mm/damon: documentation and comment fixes" (niecheng) - "remove mmap_action success, error hooks" (Lorenzo Stoakes) Eliminate custom hooks from mmap_action by removing the problematic success_hook which allowed drivers to improperly access uninitialized VMAs. It replaces the error_hook with a simple error-code field and updates the memory char driver accordingly - "mm/damon: minor improvements for code readability and tests" (SeongJae Park) - "mm/damon: fix macro arguments and clarify quota goals doc" (Maksym Shcherba) - "userfaultfd: merge fs/userfaultfd.c into mm/userfaultfd.c" (Mike Rapoport) - "mm/mglru: improve reclaim loop and dirty folio" (Kairui Song and others) Clean up and slightly improves MGLRU's reclaim loop and dirty writeback handling. Large performance improvements are measured - "use vma locks for proc/pid/{smaps|numa_maps} reads" (Suren Baghdasaryan) Use per-vma locks when reading /proc/pid/smaps and numa_maps similar to reduce contention on central mmap_lock - "refactors thpsize_shmem_enabled_store() and thpsize_shmem_enabled_show()" (Ran Xiaokai) Some cleanup work in the THP code - "selftests/memfd: fix compilation warnings" (Konstantin Khorenko) Fix a few build glitches in the memfd selftest code. - "memcg: shrink obj_stock_pcp and cache multiple objcgs" (Shakeel Butt) Resolve a 68% performance regression caused by NUMA-node cache thrashing around struct obj_stock_pcp by shrinking its existing fields and expanding it into a multi-slot array that caches up to five obj_cgroup pointers per CPU, allowing per-node variants of the same memcg to coexist within a single 64-byte cache line. - "zram: writeback fixes" (Sergey Senozhatsky) address a couple of unrelated zram writeback issues - "mm: switch THP shrinker to list_lru" (Johannes Weiner) Resolve NUMA-awareness issues and streamlines callsite interaction by refactoring and extending the list_lru API to completely replace the complex, open-coded deferred split queue for Transparent Huge Pages - "mm: improve large folio readahead for exec memory" (Usama Arif) Improve large-folio readahead on systems like 64K-page arm64 by preventing the mmap_miss check from permanently disabling target-oriented VM_EXEC readahead, and by generalizing the force_thp_readahead gate to support mappings with any usefully large maximum folio order under the cache cap. - "userfaultfd/pagemap: pre-existing fixes" (Kiryl Shutsemau) Fix a bunch of minor issues in the userfaultfd/pagemap, all of which were flagged by Sashiko review of proposed new material - "mm/sparse-vmemmap: Provide generic vmemmap_set_pmd() and vmemmap_check_pmd()" (Muchun Song) Provide generic versions of these two functions so the four arch-specific implementations can be removed. - "mm/swap, PM: hibernate: fix swapoff race in uswsusp by pinning swap device" (Youngjun Park) Address a uswsusp-vs-swapoff race and reduces the swap device reference taking/releasing frequency. - "mm/hmm: A fix and a selftest" (Dev Jain) * tag 'mm-stable-2026-06-18-09-26' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm: (321 commits) selftests/mm/hmm-tests: test pagemap reads of PMD device-private entries fs/proc/task_mmu: do not warn on seeing non-migration pmd entry lib/test_hmm: check alloc_page_vma() return value and handle OOM mm/compaction: cap compact_gap() at COMPACT_CLUSTER_MAX mm/swap: remove redundant swap device reference in alloc/free mm/swap, PM: hibernate: fix swapoff race in uswsusp by pinning swap device mm/filemap: use folio_next_index() for start vmalloc: fix NULL pointer dereference in is_vm_area_hugepages() sparc/mm: drop vmemmap_check_pmd helper and use generic code loongarch/mm: drop vmemmap_check_pmd helper and use generic code riscv/mm: drop vmemmap_pmd helpers and use generic code arm64/mm: drop vmemmap_pmd helpers and use generic code mm/sparse-vmemmap: provide generic vmemmap_set_pmd() and vmemmap_check_pmd() rust: page: mark Page::nid as inline userfaultfd: build __VMA_UFFD_FLAGS from config-gated masks userfaultfd: gate must_wait writability check on pte_present() mm/huge_memory: preserve pmd_swp_uffd_wp on device-private PMD downgrade fs/proc/task_mmu: fix hugetlb self-deadlock in pagemap_scan_pte_hole() fs/proc/task_mmu: use huge_page_size() in pagemap_scan_hugetlb_entry() fs/proc/task_mmu: fix make_uffd_wp_huge_pte() prot-update race ...

Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm

2026-06-19T15:56:49+00:00

Pull kvm updates from Paolo Bonzini: "arm64: This is a bit of an odd merge window on the KVM/arm64 front. There is absolutely no new feature in the pull request. It is purely fixes, because it is simply becoming too hard to review new stuff when so many AI-fuelled fixes hit the list. - Significant cleanup of the vgic-v5 PPI support which was merged in 7.1. This makes the code more maintainable, and squashes a couple of bugs in the meantime - Set of fixes for the handling of the MMU in an NV context, particularly VNCR-triggered faults. S1POE support is fixed as well - Large set of pKVM fixes, mostly addressing recurring issues around hypervisor tracking of donated pages in obscure cases where the donation could fail and leave things in a bizarre state - Fixes for the so-called "lazy vgic init", which resulted in sleeping operations in non-preemptible sections. This turned out to be far more invasive than initially expected.. - Reduce the overhead of L1/L2 context switch by not touching the FP registers - Fix the way non-implemented page sizes are dealt with when a guest insist on using them for S2 translation - The usual set of low-impact fixes and cleanups all over the map Loongarch: - On a request for lazy FPU load, load all FPU state that the VM supports instead of enabling only the part (FPU, LSX or LASX) that caused the FPU load request - Some enhancements about interrupt injection - Some bug fixes and other small changes RISC-V: - Batch G-stage TLB flushes for GPA range based page table updates - Convert HGEI line management to fully per-HART - Fix missing CSR dirty marking when FWFT state updated via ONE_REG - Fix stale FWFT feature exposure to Guest/VM - Speed up dirty logging write faults using MMU rwlock and atomic PTE updates using cmpxchg() for permission-only changes - Use flexible array for APLIC IRQ state - Use kvm_slot_dirty_track_enabled() for logging enable check on a memslot - Avoid skipping valid pages in kvm_riscv_gstage_wp_range() - Avoid skipping valid pages in kvm_riscv_gstage_unmap_range() - Use endian-specific __lelong for NACL shared memory S390: - KVM_PRE_FAULT_MEMORY support - Support for 2G hugepages - Support for the ASTFLEIE 2 facility - Support for fast inject using kvm_arch_set_irq_inatomic - Fix potential leak of uninitialized bytes - A few more misc gmap fixes x86: - Generic support for the more granular permissions allowed by EPT, namely "read" (which was previously usurping the U bit) and separate execution bits for kernel and userspace - Do not assume that all page tables start with U=1/W=1/NX=0 at the root, as AMD GMET needs to have U=0 at the root - Introduce common assembly macros for use within Intel and AMD vendor-specific vmentry code. This touches the SPEC_CTRL handling, which is now entirely done in assembly for Intel (by reusing the AMD code that already existed), and register save/restore which uses some macro magic to compute the offsets in the struct. Both of these are preparatory changes for upcoming APX support - Clean up KVM's register tracking and storage, primarily to prepare for APX support, which expands the maximum number of GPRs from 16 to 32 - Keep a single copy of the PDPTRs rather than two, since architecturally there is just one - Handle EXIT_FASTPATH_EXIT_USERSPACE in vendor code to ensure vendor code gets a chance to handle things like reaping the PML buffer - Update KVM's view of PV async enabling if and only if the MSR write fully succeeds - Fix a variety of issues where the emulator doesn't honor guest-debug state, and clean up related code along the way - Synthesize EPT Violation and #NPF "error code" bits when injecting faults into L1 that didn't originate in hardware (in which case the VMCS/VMCB doesn't hold relevant information) - Add support for virtualizing (well, emulating) AMD's flavor of CPL>0 CPUID faulting - Clean up the GPR APIs so that KVM's use of "raw" is consistent, and fix a variety of minor bugs along the way - Fix an OOB memory access due to not checking the VP ID when handling a Hyper-V PV TLB flush for L2 - Fix a bug in the mediated PMU's handling of fixed counters that allowed the guest to bypass the PMU event filter - Allow userspace to return EAGAIN when handling SNP and TDX hypercalls, so the KVM can forward a "retry" status code to the guest, and reserve all unused error codes for future usage - Overhaul the TDP MMU => S-EPT code to move as much S-EPT specific logic as possible into the TDX code, and to funnel (almost) all S-EPT updates into a single chokepoint. The motivation is largely to prepare for upcoming Dynamic PAMT support, but the cleanups are nice to have on their own - Plug a hole in shadow page table handling, where KVM fails to recursively zap nested EPT/NPT shadow page tables when the nested hypervisor tears down its own EPT/NPT page tables from the bottom up x86 (Intel): - Support for nested MBEC (Mode-Based Execute Control), see above in the generic section; also run with MBEC enabled even for non-nested mode - Use the kernel's "enum pg_level" in the TDX APIs instead of the TDX-Module's level definitions (which are 0-based) - Rework the TDX memory APIs to not require/assume that guest memory is backed by "struct page" (in prepartion for guest_memfd hugepage support) - Fix a largely benign bug where KVM TDX would incorrectly state it could emulate several x2APIC MSRs - Use the "safe" WRMSR API when proxying LBR MSR writes as the to-be-written value is guest controlled and completely unvalidated x86 (AMD): - Support for nested GMET (Guest Mode Execution Trap), see above in the generic section; also run with GMET enabled even for non-nested mode - Fixes and minor cleanups to GHCB handling, on top of the earlier work already merged into 7.1-rc - Ensure KVM's copy of CR0 and CR3 are up-to-date prior to invoking fastpath handlers - Add support for virtualizing gPAT (KVM previously just used L1's PAT when running L2) - Fix goofs where KVM mishandles side effects (e.g. single-step and PMC updates) when emulating VMRUN - Fix a variety of bugs in AVIC's handling of x2APIC MSR interception, most notably where KVM didn't disable interception of IRR, ISR, and TMR regs - Add support for virtualizing Host-Only/Guest-Only bits in the mediated PMU - Don't advertise support for unusable VM types, and account for VM types that are disabled by firmware, e.g. to mitigate security vulnerabilities - Rewrite the SEV {en,de}crypt debug ioctls as they were riddle with bugs and unnecessarily complicated, and add comprehensive tests - Clean up and deduplicate the SEV page pinning code - Fix minor goofs related to writing back CPUID information after firmware rejects a CPUID page for an SNP vCPU Generic: - Rename invalidate_begin() to invalidate_start() throughout KVM to follow the kernel's nomenclature, e.g. for mmu_notifiers - Use guard() to cleanup up various KVM+VFIO flows - Minor cleanups guest_memfd: - Return -EEXIST instead of -EINVAL if userspace attempts to bind a gmem range to multiple memslots, and fix the test that was supposed to ensure KVM returns -EEXIST - Treat memslot binding offsets and sizes as unsigned values to fix a bug where KVM interprets a large "offset + size" as a negative value and allows a nonsensical offset - Use the inode number instead of the page offset for the NUMA interleaving index to fix a bug where the effective index would jump by two for consecutive pages (the caller also adds in the page offset) Selftests: - Randomize the dirty log test's delay when reaping the bitmap on the first pass, as always waiting only 1ms hid a KVM RISC-V bug as the test reaped the bitmap before KVM could build up enough state to hit the bug - A pile of one-off fixes and cleanups" * tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm: (326 commits) KVM: x86/mmu: Ensure hugepage is in by slot before checking max mapping level KVM: x86: Fix shadow paging use-after-free due to unexpected role KVM: s390: Introducing kvm_arch_set_irq_inatomic fast inject KVM: s390: Enable adapter_indicators_set to use mapped pages KVM: s390: Add map/unmap ioctl and clean mappings post-guest riscv: kvm: Use endian-specific __lelong for NACL shared memory KVM: selftests: access_tracking_perf_test: bump number of NUMA nodes to 32 KVM: s390: vsie: Implement ASTFLEIE facility 2 KVM: s390: vsie: Refactor handle_stfle s390/sclp: Detect ASTFLEIE 2 facility KVM: s390: Minor refactor of base/ext facility lists KVM: x86/mmu: move pdptrs out of the MMU KVM: x86: check that kvm_handle_invpcid is only invoked with shadow paging KVM: nSVM: invalidate cached PDPTRs across nested NPT transitions KVM: nVMX: remove unnecessary code in prepare_vmcs02_rare KVM: x86: remove nested_mmu from mmu_is_nested() KVM: arm64: vgic-its: Make ABI commit helpers return void KVM: s390: Initialize KVM_S390_GET_CMMA_BITS memory LoongArch: KVM: Add missing slots_lock for device register/unregister LoongArch: KVM: Validate irqchip index in irqfd routing ...

s390/pkey: Check length in pkey_pckmo handler implementation

2026-06-19T12:51:08+00:00

Explicitly check the length of the target buffer in the pkey_pckmo implementation of the key_to_protkey() handler function. The handler function fails, if the generated output data exceeds the length of the provided target buffer. Cc: stable@vger.kernel.org Fixes: 8fcc231ce3be ("s390/pkey: Introduce pkey base with handler registry and handler modules") Reported-by: Christian Borntraeger Reviewed-by: Harald Freudenberger Signed-off-by: Holger Dengler Signed-off-by: Alexander Gordeev

s390/pkey: Check length in PKEY_VERIFYPROTK ioctl

2026-06-19T12:51:08+00:00

Explicitly check the buffer length request structure provided by user-space and fail, if it exceeds the buffer size. Cc: stable@vger.kernel.org Fixes: 8fcc231ce3be ("s390/pkey: Introduce pkey base with handler registry and handler modules") Reported-by: Christian Borntraeger Reviewed-by: Harald Freudenberger Reviewed-by: Ingo Franzki Signed-off-by: Holger Dengler Signed-off-by: Alexander Gordeev