linux-dev/drivers/s390/char, branch master

s390/vmur: generate uevent on unsolicited device end

2022-10-10T08:15:10Z

When a traditional channel-attached device transitions from not-ready to ready state, an unsolicited DEVICE END I/O interrupt is raised. This happens for example when a new file arrives in the z/VM virtual reader device. Change the Linux kernel to generate a change uevent when such an interrupt occurs for any online unit record devices supported by the vmur driver. This can be useful to automatically trigger processing of files as they arrive in the reader device. A sample udev rule for running a program when this event occurs looks as follows: ENV{DRIVER}=="vmur", ACTION=="change", ENV{EVENT}=="unsol_de", \ RUN{program}="/path/to/program" The rule can be tested using the following steps: 1. Set reader device online (assuming default reader device number 000c) $ chzdev -ea 0.0.000c 2. Force a ready-state transition using z/VM's READY CP command $ vmcp ready 000c Suggested-by: Alan Altmark Reviewed-by: Heiko Carstens Reviewed-by: Sven Schnelle Signed-off-by: Peter Oberparleiter Signed-off-by: Vasily Gorbik

s390/vmur: remove unnecessary BUG statement

2022-10-10T08:15:10Z

An existing BUG statement in vmur's interrupt handler triggers if: 1. An online vmur device is removed (e.g. due to driver unload, manual unbind or channel-report words indicating hypervisor-side device removal) 2. Device deactivation fails due to firmware/hypervisor error, leaving subchannel enabled for interrupts + drvdata=NULL 3. Interrupt occurs This situation is highly unlikely and not a clear indication of a general system error that would warrant stopping the full Linux system. Also it can be prevented completely by clearing the interrupt handler when unsetting a vmur device's drvdata. Replace the BUG statement in vmur's interrupt handler by clearing the interrupt handler callback during device removal. Also move the initial setting of the interrupt handler callback under lock for consistency reasons. Reviewed-by: Sven Schnelle Reviewed-by: Heiko Carstens Signed-off-by: Peter Oberparleiter Signed-off-by: Vasily Gorbik

Merge tag 's390-6.1-1' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux

2022-10-09T20:51:40Z

Pull s390 updates from Vasily Gorbik: - Make use of the IBM z16 processor activity instrumentation facility extension to count neural network processor assist operations: add a new PMU device driver so that perf can make use of this. - Rework memcpy_real() to avoid DAT-off mode. - Rework absolute lowcore access code. - Various small fixes and improvements all over the code. * tag 's390-6.1-1' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux: s390/pci: remove unused bus_next field from struct zpci_dev s390/cio: remove unused ccw_device_force_console() declaration s390/pai: Add support for PAI Extension 1 NNPA counters s390/mm: fix no previous prototype warnings in maccess.c s390/mm: uninline copy_oldmem_kernel() function s390/mm,ptdump: add real memory copy page markers s390/mm: rework memcpy_real() to avoid DAT-off mode s390/dump: save IPL CPU registers once DAT is available s390/pci: convert high_memory to physical address s390/smp,ptdump: add absolute lowcore markers s390/smp: rework absolute lowcore access s390/smp: call smp_reinit_ipl_cpu() before scheduler is available s390/ptdump: add missing amode31 markers s390/mm: split lowcore pages with set_memory_4k() s390/mm: remove unused access parameter from do_fault_error() s390/delay: sync comment within __delay() with reality s390: move from strlcpy with unused retval to strscpy

s390/mm: rework memcpy_real() to avoid DAT-off mode

2022-09-14T14:46:01Z

Function memcpy_real() is an univeral data mover that does not require DAT mode to be able reading from a physical address. Its advantage is an ability to read from any address, even those for which no kernel virtual mapping exists. Although memcpy_real() is interrupt-safe, there are no handlers that make use of this function. The compiler instrumentation have to be disabled and separate no-DAT stack used to allow execution of the function once DAT mode is disabled. Rework memcpy_real() to overcome these shortcomings. As result, data copying (which is primarily reading out a crashed system memory by a user process) is executed on a regular stack with enabled interrupts. Also, use of memcpy_real_buf swap buffer becomes unnecessary and the swapping is eliminated. The above is achieved by using a fixed virtual address range that spans a single page and remaps that page repeatedly when memcpy_real() is called for a particular physical address. Reviewed-by: Heiko Carstens Signed-off-by: Alexander Gordeev Signed-off-by: Vasily Gorbik

s390: move from strlcpy with unused retval to strscpy

2022-08-30T20:00:33Z

Follow the advice of the below link and prefer 'strscpy' in this subsystem. Conversion is 1:1 because the return value is not used. Generated by a coccinelle script. Link: https://lore.kernel.org/r/CAHk-=wgfRnXz0W3D37d01q3JFkr_i_uTL=V6A6G1oUZcprmknw@mail.gmail.com/ Signed-off-by: Wolfram Sang Acked-by: Jakub Kicinski Acked-by: Benjamin Block Acked-by: Alexandra Winter Link: https://lore.kernel.org/r/20220818205948.6360-1-wsa+renesas@sang-engineering.com Link: https://lore.kernel.org/r/20220818210102.7301-1-wsa+renesas@sang-engineering.com [gor@linux.ibm.com: squashed two changes linked above together] Signed-off-by: Vasily Gorbik

tty: Make ->set_termios() old ktermios const

2022-08-30T12:22:35Z

There should be no reason to adjust old ktermios which is going to get discarded anyway. Reviewed-by: Andy Shevchenko Signed-off-by: Ilpo Järvinen Link: https://lore.kernel.org/r/20220816115739.10928-9-ilpo.jarvinen@linux.intel.com Signed-off-by: Greg Kroah-Hartman

Merge tag 's390-5.20-1' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux

2022-08-07T00:05:21Z

Pull s390 updates from Alexander Gordeev: - Rework copy_oldmem_page() callback to take an iov_iter. This includes a few prerequisite updates and fixes to the oldmem reading code. - Rework cpufeature implementation to allow for various CPU feature indications, which is not only limited to hardware capabilities, but also allows CPU facilities. - Use the cpufeature rework to autoload Ultravisor module when CPU facility 158 is available. - Add ELF note type for encrypted CPU state of a protected virtual CPU. The zgetdump tool from s390-tools package will decrypt the CPU state using a Customer Communication Key and overwrite respective notes to make the data accessible for crash and other debugging tools. - Use vzalloc() instead of vmalloc() + memset() in ChaCha20 crypto test. - Fix incorrect recovery of kretprobe modified return address in stacktrace. - Switch the NMI handler to use generic irqentry_nmi_enter() and irqentry_nmi_exit() helper functions. - Rework the cryptographic Adjunct Processors (AP) pass-through design to support dynamic changes to the AP matrix of a running guest as well as to implement more of the AP architecture. - Minor boot code cleanups. - Grammar and typo fixes to hmcdrv and tape drivers. * tag 's390-5.20-1' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux: (46 commits) Revert "s390/smp: enforce lowcore protection on CPU restart" Revert "s390/smp: rework absolute lowcore access" Revert "s390/smp,ptdump: add absolute lowcore markers" s390/unwind: fix fgraph return address recovery s390/nmi: use irqentry_nmi_enter()/irqentry_nmi_exit() s390: add ELF note type for encrypted CPU state of a PV VCPU s390/smp,ptdump: add absolute lowcore markers s390/smp: rework absolute lowcore access s390/setup: rearrange absolute lowcore initialization s390/boot: cleanup adjust_to_uv_max() function s390/smp: enforce lowcore protection on CPU restart s390/tape: fix comment typo s390/hmcdrv: fix Kconfig "its" grammar s390/docs: fix warnings for vfio_ap driver doc s390/docs: fix warnings for vfio_ap driver lock usage doc s390/crash: support multi-segment iterators s390/crash: use static swap buffer for copy_to_user_real() s390/crash: move copy_to_user_real() to crash_dump.c s390/zcore: fix race when reading from hardware system area s390/crash: fix incorrect number of bytes to copy to user space ...

Merge remote-tracking branch 'kvm/next' into kvm-next-5.20

2022-08-01T07:21:00Z

KVM/s390, KVM/x86 and common infrastructure changes for 5.20 x86: * Permit guests to ignore single-bit ECC errors * Fix races in gfn->pfn cache refresh; do not pin pages tracked by the cache * Intel IPI virtualization * Allow getting/setting pending triple fault with KVM_GET/SET_VCPU_EVENTS * PEBS virtualization * Simplify PMU emulation by just using PERF_TYPE_RAW events * More accurate event reinjection on SVM (avoid retrying instructions) * Allow getting/setting the state of the speaker port data bit * Refuse starting the kvm-intel module if VM-Entry/VM-Exit controls are inconsistent * "Notify" VM exit (detect microarchitectural hangs) for Intel * Cleanups for MCE MSR emulation s390: * add an interface to provide a hypervisor dump for secure guests * improve selftests to use TAP interface * enable interpretive execution of zPCI instructions (for PCI passthrough) * First part of deferred teardown * CPU Topology * PV attestation * Minor fixes Generic: * new selftests API using struct kvm_vcpu instead of a (vm, id) tuple x86: * Use try_cmpxchg64 instead of cmpxchg64 * Bugfixes * Ignore benign host accesses to PMU MSRs when PMU is disabled * Allow disabling KVM's "MONITOR/MWAIT are NOPs!" behavior * x86/MMU: Allow NX huge pages to be disabled on a per-vm basis * Port eager page splitting to shadow MMU as well * Enable CMCI capability by default and handle injected UCNA errors * Expose pid of vcpu threads in debugfs * x2AVIC support for AMD * cleanup PIO emulation * Fixes for LLDT/LTR emulation * Don't require refcounted "struct page" to create huge SPTEs x86 cleanups: * Use separate namespaces for guest PTEs and shadow PTEs bitmasks * PIO emulation * Reorganize rmap API, mostly around rmap destruction * Do not workaround very old KVM bugs for L0 that runs with nesting enabled * new selftests API for CPUID

s390/tape: fix comment typo

2022-07-28T16:05:23Z

Remove duplicated `that' in a comment Signed-off-by: Jason Wang Link: https://lore.kernel.org/r/20220715053838.5005-1-wangborong@cdjrlc.com [agordeev@linux.ibm.com rephrased commit message] Signed-off-by: Alexander Gordeev

s390/hmcdrv: fix Kconfig "its" grammar

2022-07-28T16:05:22Z

Use the possessive "its" instead of the contraction "it's" where appropriate. Signed-off-by: Randy Dunlap Cc: Heiko Carstens Cc: Vasily Gorbik Cc: Alexander Gordeev Cc: linux-s390@vger.kernel.org Link: https://lore.kernel.org/r/20220715020010.12678-1-rdunlap@infradead.org Signed-off-by: Alexander Gordeev