s390 patches for the 7.3 merge window

Hello Linus,

Please pull s390 changes for 7.3.

The s390 cpuidle driver series adds a new driver under drivers/cpuidle/ and the corresponding MAINTAINERS entry. The driver was reviewed by Christian Loehle, and the whole series was acked by cpuidle maintainer Rafael J. Wysocki:

https://lore.kernel.org/all/[email protected]/

The series also removes now unused generic arch_needs_cpu() hook:

 include/linux/tick.h                   |   3 -
 kernel/time/tick-sched.c               |   7 +-

which was reviewed by Thomas Gleixner:
https://lore.kernel.org/all/87v7br3fs7.ffs@fw13/

Thank you,
Vasily

The following changes since commit 8cdeaa50eae8dad34885515f62559ee83e7e8dda:

Linux 7.2-rc2 (2026-07-05 14:44:06 -1000)

are available in the Git repository at:

git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux.git tags/s390-7.3-1

for you to fetch changes up to 101782f8945a125044347312d74d488c05741c4a:

s390/percpu: Fix MVIY_PERCPU() with older binutils (2026-08-13 16:56:45 +0200)

----------------------------------------------------------------
s390 updates for 7.3 merge window

- Add a cpuidle driver with polling and enabled wait states using the existing CPU idle infrastructure and idle governor to improve latency for frequent sleep/wakeup cycles. Remove the obsolete tick delay heuristic and generic arch_needs_cpu() hook. Add the corresponding driver entry to MAINTAINERS

- Add kCFI support using the generic support provided by Clang

- Enable Clang CONTEXT_ANALYSIS for various architecture code and for char, PCI, CIO and virtio drivers. Add required lock annotations, exclude unsupported mm helpers and remove conditional PCI locking

- Fix secure storage access exception handling and reintroduce DCACHE_WORD_ACCESS previously removed as a workaround

- Fix cpum_cf perf crashes when CPUs are brought online while per-task events are active. Allocate and remove per-CPU counter data from CPU hotplug callbacks

- Fix a deadlock when an s390dbf debug area is unregistered while one of its debugfs files is being written to

- Fix MVIY_PERCPU() with binutils older than 2.39, where an assembler macro silently omitted an instruction needed to repair interrupted operations after CPU migration

- Remove/replace cond_resched() calls which are no-ops with the supported s390 preemption models

- Fix AP queue depth and maximum message length decoding according to the architecture. Current hardware is not affected, but future hardware could report values which were handled incorrectly

- Reflect the configured CPU state in cpu_enabled_mask so deconfigured CPUs are not presented as available for onlining

- Restore the vDSO GNU_EH_FRAME program header which was lost when the build switched to direct linker invocation, and mark it read-only

- Add SCLP action qualifiers used by Spyre for card initialization, recoverable error and telemetry reporting

- Move KMSAN interrupt flag helpers out of line to fix -Wstatic-in-inline build warnings

- Use level-specific page table entry accessors for hugetlb entries and ptep_get() when accessing crashed kernel memory in kdump

- Make forced AP bus rescans killable so that a user process blocked behind an ongoing scan can still be terminated with SIGKILL

- Rework pkey ioctl error paths to remove duplicated cleanup code and avoid freeing error pointers

- Allow the protected guest SWIOTLB buffer to be allocated outside the first 2GB. Also enable dynamic SWIOTLB growth and the coherent atomic pool fallback to improve I/O behavior when the initial pool is exhausted

- Add program check statistics and spinlock contention tracepoints. Increase the lockdep chain capacity to keep lockdep enabled for complex code paths such as btrfs

- Simplify IPL, trap and syscall code and remove the obsolete unistd_32.h generation entry

----------------------------------------------------------------
Alexander Gordeev (1):
s390/maccess: Use proper PTE accessors for copying old memory

Christian Borntraeger (1):
s390/configs: Increase CONFIG_LOCKDEP_CHAINS_BITS

Ciunas Bennett (1):
s390/spinlock: Add contention tracepoints to lock slowpath

Finn Callies (2):
s390/ap: Fix queue depth field length
s390/ap: Fix MAPML computation

Gerald Schaefer (1):
s390/mm: Use set_pmd() / set_pud() for hugetlb pagetable entries

Harald Freudenberger (2):
s390/ap: Use mutex_lock_killable() in ap_bus_force_rescan() s390/pkey: Rework ioctl functions error paths

Heiko Carstens (29):
KVM: s390: pv: Use VM_SPARSE area for guest variable storage area s390/mm: Add missing mm check to do_secure_storage_access() s390/mm: Use lock_mm_and_find_vma() in do_secure_storage_access() s390/mm: Fix handling of vmalloc area in do_secure_storage_access() s390/mm: Remove folio handling for kernel faults in do_secure_storage_access() s390/mm: Use handle_fault_error() in do_secure_storage_access() s390/mm: Use goto statement in do_secure_storage_access()
s390: Add support for DCACHE_WORD_ACCESS (again)
s390/tools: Pass symbol name to do_relocs()
s390/tools/relocs: Ignore __kcfi_typeid_ relocations
s390: Add ftrace_stub_graph
s390/diag: Generate CFI type information for assembly functions s390/bpf: Add kCFI support
s390/Kconfig: Select ARCH_SUPPORTS_CFI
KVM: s390: Remove cond_resched() calls
s390: Remove cond_resched() calls
s390/cio: Remove cond_resched() calls
s390/con3215: Add __must_hold() attribute to raw3215_make_room() s390/char: Enable CONTEXT_ANALYSIS
s390/pci: Rework __zpci_event_error() to remove conditional locking s390/pci: Rework __zpci_event_availability() to remove conditional locking s390/pci: Enable CONTEXT_ANALYSIS
s390/vfio_ccw: Add __must_hold() attribute to vfio_ccw_sch_quiesce() s390/cio: Enable CONTEXT_ANALYSIS
s390/virtio: Enable CONTEXT_ANALYSIS
s390/sysinfo: Add context analysis attributes
s390/mm: Add __context_unsafe() attribute to do_secure_storage_access() s390/mm: Add __context_unsafe() attribute to gmap helper functions
s390: Enable CONTEXT_ANALYSIS for various directories

Ilya Leoshkevich (1):
s390/irqflags: Add out-of-line definitions of arch_local_irq_*() for KMSAN

Jaehoon Kim (2):
s390/pv: Enable SWIOTLB_ANY for s390 PV
s390: Select SWIOTLB_DYNAMIC and DMA_COHERENT_POOL

Jens Remus (2):
s390/vdso: Pass --eh-frame-hdr to the linker s390/vdso: Use symbolic constants for the PHDR permission flags

Karl Mehltretter (1):
s390/percpu: Fix MVIY_PERCPU() with older binutils

Mete Durlu (8):
s390/tick: Remove CIF_NOHZ_DELAY flag
tick: Remove arch_needs_cpu
s390: Enable TIF_POLLING_NRFLAG
s390/idle: Introduce cpuidle for s390 s390/configs: Enable cpuidle driver on s390 s390/ipl: Use ARRAY_SIZE macro
s390/ipl: Improve readability
s390/smp: Reflect (de)configured CPUs to cpu_enabled_mask

Niklas Schnelle (1):
s390/sclp: Allow SCLP Action Qualifiers for Spyre card status reporting

Peter Oberparleiter (1):
s390/debug: Fix deadlock during unregister

Peter Zijlstra (1):
s390/crypto: Replace cond_resched() with msleep(1)

Sven Schnelle (3):
s390/traps: Add exception statistics
s390/traps: Remove PIF_GUEST_FAULT
s390/syscalls: Use define instead of '1' to indicate PER trap

Thomas Huth (1):
s390/uapi: Remove obsolete unistd_32.h from Kbuild file

Thomas Richter (1):
s390/cpum_cf: Handle CPU hotplug via prepare/dead callbacks

 MAINTAINERS                            |   8 +
 arch/s390/Kconfig                      |  10 ++
 arch/s390/appldata/Makefile            |   2 +
 arch/s390/configs/debug_defconfig      |   4 +-
 arch/s390/configs/defconfig            |   2 +
 arch/s390/crypto/paes_s390.c           |  44 +----
 arch/s390/crypto/phmac_s390.c          |  25 +--
 arch/s390/hypfs/Makefile               |   2 +
 arch/s390/include/asm/ap.h             |   4 +-
 arch/s390/include/asm/asm-extable.h    |   4 +
 arch/s390/include/asm/cfi.h            |   7 +
 arch/s390/include/asm/hugetlb.h        |   4 +-
 arch/s390/include/asm/irqflags.h       |  20 ++-
 arch/s390/include/asm/percpu.h         |   4 +-
 arch/s390/include/asm/pkey.h           |  16 ++
 arch/s390/include/asm/processor.h      |   4 -
 arch/s390/include/asm/ptrace.h         |   4 +-
 arch/s390/include/asm/sclp.h           |   3 +
 arch/s390/include/asm/thread_info.h    |   1 +
 arch/s390/include/asm/uv.h             |  18 +-
 arch/s390/include/asm/word-at-a-time.h |  22 +++
 arch/s390/include/uapi/asm/Kbuild      |   1 -
 arch/s390/kernel/Makefile              |   3 +
 arch/s390/kernel/debug.c               |  10 +-
 arch/s390/kernel/entry.S               |   9 +-
 arch/s390/kernel/entry.h               |  10 +-
 arch/s390/kernel/idle.c                |   1 -
 arch/s390/kernel/ipl.c                 |  58 ++++---
 arch/s390/kernel/irq.c                 |   4 -
 arch/s390/kernel/irqflags.c            |  28 ++++
 arch/s390/kernel/mcount.S              |   9 +-
 arch/s390/kernel/perf_cpum_cf.c        | 222 ++++++++++++++++---------
 arch/s390/kernel/smp.c                 |   6 +-
 arch/s390/kernel/syscall.c             |   4 +-
 arch/s390/kernel/sysinfo.c             |   2 +
 arch/s390/kernel/text_amode31.S        |  13 +-
 arch/s390/kernel/traps.c               |  45 ++++-
 arch/s390/kernel/uv.c                  |  67 +++++++-
 arch/s390/kernel/vdso/Makefile         |   3 +-
 arch/s390/kernel/vdso/vdso.lds.S       |  11 +-
 arch/s390/kvm/gaccess.c                |   8 +-
 arch/s390/kvm/gmap.c                   |   4 -
 arch/s390/kvm/kvm-s390.c               |   1 -
 arch/s390/kvm/pv.c                     |  17 +-
 arch/s390/kvm/vsie.c                   |   1 -
 arch/s390/lib/Makefile                 |   2 +
 arch/s390/lib/spinlock.c               |   3 +
 arch/s390/mm/Makefile                  |   2 +
 arch/s390/mm/cmm.c                     |   2 -
 arch/s390/mm/extable.c                 |  18 ++
 arch/s390/mm/fault.c                   |  36 ++--
 arch/s390/mm/gmap_helpers.c            |   4 +-
 arch/s390/mm/hugetlbpage.c             |  10 +-
 arch/s390/mm/init.c                    |   2 +-
 arch/s390/mm/maccess.c                 |   2 +-
 arch/s390/mm/pageattr.c                |   5 -
 arch/s390/mm/pgalloc.c                 |   1 -
 arch/s390/net/Makefile                 |   3 +
 arch/s390/net/bpf_jit_comp.c           |  28 +++-
 arch/s390/pci/Makefile                 |   2 +
 arch/s390/pci/pci.c                    |   4 +-
 arch/s390/pci/pci_event.c              | 205 ++++++++++++-----------
 arch/s390/purgatory/Makefile           |   2 +
 arch/s390/tools/relocs.c               | 158 +++++++++++++++++-
 drivers/cpuidle/Kconfig                |   5 +
 drivers/cpuidle/Kconfig.s390           |  11 ++
 drivers/cpuidle/Makefile               |   4 +
 drivers/cpuidle/cpuidle-s390.c         | 115 +++++++++++++
 drivers/s390/char/Makefile             |   2 +
 drivers/s390/char/con3215.c            |   1 +
 drivers/s390/char/sclp_pci.c           |   3 +
 drivers/s390/char/uvdevice.c           |   6 +-
 drivers/s390/cio/Makefile              |   2 +
 drivers/s390/cio/css.c                 |   8 -
 drivers/s390/cio/vfio_ccw_drv.c        |   1 +
 drivers/s390/cio/vfio_ccw_private.h    |   3 +-
 drivers/s390/crypto/ap_bus.c           |   4 +-
 drivers/s390/crypto/ap_bus.h           |   2 +-
 drivers/s390/crypto/ap_card.c          |   2 +-
 drivers/s390/crypto/pkey_api.c         | 290 ++++++++++++++++++---------------
 drivers/s390/virtio/Makefile           |   2 +
 include/linux/tick.h                   |   3 -
 kernel/time/tick-sched.c               |   7 +-
 83 files changed, 1159 insertions(+), 546 deletions(-)
 create mode 100644 arch/s390/include/asm/cfi.h
 create mode 100644 arch/s390/kernel/irqflags.c
 create mode 100644 drivers/cpuidle/Kconfig.s390
 create mode 100644 drivers/cpuidle/cpuidle-s390.c