blaster4385/linux-IllusionX/arch/s390/kernel/vdso64, branch v6.13

s390/vdso: Drop LBASE_VDSO

2024-11-02T11:37:32Z

This constant is always "0", providing no value and making the logic harder to understand. Also prepare for a consolidation of the vdso linkerscript logic by aligning it with other architectures. Signed-off-by: Thomas Weißschuh Signed-off-by: Thomas Gleixner Acked-by: Heiko Carstens Link: https://lore.kernel.org/all/20241010-vdso-generic-base-v1-3-b64f0842d512@linutronix.de

s390/vdso: Use one large alternative instead of an alternative branch

2024-09-23T15:57:04Z

Replace the alternative branch with a larger alternative that contains both paths. That way the two paths are closer together and it is easier to change both paths if the need should arise. Signed-off-by: Heiko Carstens Reviewed-by: Jens Remus Signed-off-by: Vasily Gorbik

s390/vdso: Use SYM_DATA_START_LOCAL()/SYM_DATA_END() for data objects

2024-09-23T15:57:04Z

Use SYM_DATA_START_LOCAL()/SYM_DATA_END() in vgetrandom-chacha.S so that the constants end up in an object with correct size: readelf -Ws vgetrandom-chacha.o Num: Value Size Type Bind Vis Ndx Name ... 5: 0000000000000000 32 OBJECT LOCAL DEFAULT 5 chacha20_constants Signed-off-by: Heiko Carstens Reviewed-by: Jens Remus Signed-off-by: Vasily Gorbik

s390/vdso: Use macros for annotation of asm functions

2024-09-23T15:57:04Z

Use the macros SYM_FUNC_START() and SYM_FUNC_END() to annotate the functions in assembly. Signed-off-by: Jens Remus Signed-off-by: Heiko Carstens Acked-by: Vasily Gorbik Signed-off-by: Vasily Gorbik

s390/vdso: Add CFI annotations to __arch_chacha20_blocks_nostack()

2024-09-23T15:57:04Z

This allows proper unwinding, for instance when using a debugger such as GDB. Signed-off-by: Jens Remus Signed-off-by: Heiko Carstens Acked-by: Vasily Gorbik Signed-off-by: Vasily Gorbik

s390/vdso: Fix comment within __arch_chacha20_blocks_nostack()

2024-09-23T15:57:04Z

Fix comment within __arch_chacha20_blocks_nostack() so the comment reflects what the code is doing. Signed-off-by: Heiko Carstens Reviewed-by: Jens Remus Signed-off-by: Vasily Gorbik

s390/vdso: Get rid of permutation constants

2024-09-23T15:57:04Z

The three byte masks for VECTOR PERMUTE are not needed, since the instruction VECTOR SHIFT LEFT DOUBLE BY BYTE can be used to implement the required "rotate left" easily. Signed-off-by: Heiko Carstens Reviewed-by: Jens Remus Signed-off-by: Vasily Gorbik

s390/vdso: Wire up getrandom() vdso implementation

2024-09-13T18:57:31Z

Provide the s390 specific vdso getrandom() architecture backend. _vdso_rng_data required data is placed within the _vdso_data vvar page, by using a hardcoded offset larger than vdso_data. As required the chacha20 implementation does not write to the stack. The implementation follows more or less the arm64 implementations and makes use of vector instructions. It has a fallback to the getrandom() system call for machines where the vector facility is not installed. The check if the vector facility is installed, as well as an optimization for machines with the vector-enhancements facility 2, is implemented with alternatives, avoiding runtime checks. Note that __kernel_getrandom() is implemented without the vdso user wrapper which would setup a stack frame for odd cases (aka very old glibc variants) where the caller has not done that. All callers of __kernel_getrandom() are required to setup a stack frame, like the C ABI requires it. The vdso testcases vdso_test_getrandom and vdso_test_chacha pass. Benchmark on a z16: $ ./vdso_test_getrandom bench-single vdso: 25000000 times in 0.493703559 seconds syscall: 25000000 times in 6.584025337 seconds Signed-off-by: Heiko Carstens Reviewed-by: Harald Freudenberger Signed-off-by: Jason A. Donenfeld

s390/vdso: Allow alternatives in vdso code

2024-09-13T15:28:36Z

Implement the infrastructure required to allow alternatives in vdso code. Signed-off-by: Heiko Carstens Signed-off-by: Jason A. Donenfeld

Merge tag 's390-6.10-2' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux

2024-05-21T19:09:36Z

Pull more s390 updates from Alexander Gordeev: - Switch read and write software bits for PUDs - Add missing hardware bits for PUDs and PMDs - Generate unwind information for C modules to fix GDB unwind error for vDSO functions - Create .build-id links for unstripped vDSO files to enable vDSO debugging with symbols - Use standard stack frame layout for vDSO generated stack frames to manually walk stack frames without DWARF information - Rework perf_callchain_user() and arch_stack_walk_user() functions to reduce code duplication - Skip first stack frame when walking user stack - Add basic checks to identify invalid instruction pointers when walking stack frames - Introduce and use struct stack_frame_vdso_wrapper within vDSO user wrapper code to automatically generate an asm-offset define. Also use STACK_FRAME_USER_OVERHEAD instead of STACK_FRAME_OVERHEAD to document that the code works with user space stack - Clear the backchain of the extra stack frame added by the vDSO user wrapper code. This allows the user stack walker to detect and skip the non-standard stack frame. Without this an incorrect instruction pointer would be added to stack traces. - Rewrite psw_idle() function in C to ease maintenance and further enhancements - Remove get_vtimer() function and use get_cpu_timer() instead - Mark psw variable in __load_psw_mask() as __unitialized to avoid superfluous clearing of PSW - Remove obsolete and superfluous comment about removed TIF_FPU flag - Replace memzero_explicit() and kfree() with kfree_sensitive() to fix warnings reported by Coccinelle - Wipe sensitive data and all copies of protected- or secure-keys from stack when an IOCTL fails - Both do_airq_interrupt() and do_io_interrupt() functions set CIF_NOHZ_DELAY flag. Move it in do_io_irq() to simplify the code - Provide iucv_alloc_device() and iucv_release_device() helpers, which can be used to deduplicate more or less identical IUCV device allocation and release code in four different drivers - Make use of iucv_alloc_device() and iucv_release_device() helpers to get rid of quite some code and also remove a cast to an incompatible function (clang W=1) - There is no user of iucv_root outside of the core IUCV code left. Therefore remove the EXPORT_SYMBOL - __apply_alternatives() contains a runtime check which verifies that the size of the to be patched code area is even. Convert this to a compile time check - Increase size of buffers for sending z/VM CP DIAGNOSE X'008' commands from 128 to 240 - Do not accept z/VM CP DIAGNOSE X'008' commands longer than maximally allowed - Use correct defines IPL_BP_NVME_LEN and IPL_BP0_NVME_LEN instead of IPL_BP_FCP_LEN and IPL_BP0_FCP_LEN ones to initialize NVMe reIPL block on 'scp_data' sysfs attribute update - Initialize the correct fields of the NVMe dump block, which were confused with FCP fields - Refactor macros for 'scp_data' (re-)IPL sysfs attribute to reduce code duplication - Introduce 'scp_data' sysfs attribute for dump IPL to allow tools such as dumpconf passing additional kernel command line parameters to a stand-alone dumper - Rework the CPACF query functions to use the correct RRE or RRF instruction formats and set instruction register fields correctly - Instead of calling BUG() at runtime force a link error during compile when a unsupported opcode is used with __cpacf_query() or __cpacf_check_opcode() functions - Fix a crash in ap_parse_bitmap_str() function on /sys/bus/ap/apmask or /sys/bus/ap/aqmask sysfs file update with a relative mask value - Fix "bindings complete" udev event which should be sent once all AP devices have been bound to device drivers and again when unbind/bind actions take place and all AP devices are bound again - Facility list alt_stfle_fac_list is nowhere used in the decompressor, therefore remove it there - Remove custom kprobes insn slot allocator in favour of the standard module_alloc() one, since kernel image and module areas are located within 4GB - Use kvcalloc() instead of kvmalloc_array() in zcrypt driver to avoid calling memset() with a large byte count and get rid of the sparse warning as result * tag 's390-6.10-2' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux: (39 commits) s390/zcrypt: Use kvcalloc() instead of kvmalloc_array() s390/kprobes: Remove custom insn slot allocator s390/boot: Remove alt_stfle_fac_list from decompressor s390/ap: Fix bind complete udev event sent after each AP bus scan s390/ap: Fix crash in AP internal function modify_bitmap() s390/cpacf: Make use of invalid opcode produce a link error s390/cpacf: Split and rework cpacf query functions s390/ipl: Introduce sysfs attribute 'scp_data' for dump ipl s390/ipl: Introduce macros for (re)ipl sysfs attribute 'scp_data' s390/ipl: Fix incorrect initialization of nvme dump block s390/ipl: Fix incorrect initialization of len fields in nvme reipl block s390/ipl: Do not accept z/VM CP diag X'008' cmds longer than max length s390/ipl: Fix size of vmcmd buffers for sending z/VM CP diag X'008' cmds s390/alternatives: Convert runtime sanity check into compile time check s390/iucv: Unexport iucv_root tty: hvc-iucv: Make use of iucv_alloc_device() s390/smsgiucv_app: Make use of iucv_alloc_device() s390/netiucv: Make use of iucv_alloc_device() s390/vmlogrdr: Make use of iucv_alloc_device() s390/iucv: Provide iucv_alloc_device() / iucv_release_device() ...