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* Merge tag 's390-6.5-1' of ↵Linus Torvalds2023-06-281-0/+16
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux Pull s390 updates from Alexander Gordeev: - Fix the style of protected key API driver source: use x-mas tree for all local variable declarations - Rework protected key API driver to not use the struct pkey_protkey and pkey_clrkey anymore. Both structures have a fixed size buffer, but with the support of ECC protected key these buffers are not big enough. Use dynamic buffers internally and transparently for userspace - Add support for a new 'non CCA clear key token' with ECC clear keys supported: ECC P256, ECC P384, ECC P521, ECC ED25519 and ECC ED448. This makes it possible to derive a protected key from the ECC clear key input via PKEY_KBLOB2PROTK3 ioctl, while currently the only way to derive is via PCKMO instruction - The s390 PMU of PAI crypto and extension 1 NNPA counters use atomic_t for reference counting. Replace this with the proper data type refcount_t - Select ARCH_SUPPORTS_INT128, but limit this to clang for now, since gcc generates inefficient code, which may lead to stack overflows - Replace one-element array with flexible-array member in struct vfio_ccw_parent and refactor the rest of the code accordingly. Also, prefer struct_size() over sizeof() open- coded versions - Introduce OS_INFO_FLAGS_ENTRY pointing to a flags field and OS_INFO_FLAG_REIPL_CLEAR flag that informs a dumper whether the system memory should be cleared or not once dumped - Fix a hang when a user attempts to remove a VFIO-AP mediated device attached to a guest: add VFIO_DEVICE_GET_IRQ_INFO and VFIO_DEVICE_SET_IRQS IOCTLs and wire up the VFIO bus driver callback to request a release of the device - Fix calculation for R_390_GOTENT relocations for modules - Allow any user space process with CAP_PERFMON capability read and display the CPU Measurement facility counter sets - Rework large statically-defined per-CPU cpu_cf_events data structure and replace it with dynamically allocated structures created when a perf_event_open() system call is invoked or /dev/hwctr device is accessed * tag 's390-6.5-1' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux: s390/cpum_cf: rework PER_CPU_DEFINE of struct cpu_cf_events s390/cpum_cf: open access to hwctr device for CAP_PERFMON privileged process s390/module: fix rela calculation for R_390_GOTENT s390/vfio-ap: wire in the vfio_device_ops request callback s390/vfio-ap: realize the VFIO_DEVICE_SET_IRQS ioctl s390/vfio-ap: realize the VFIO_DEVICE_GET_IRQ_INFO ioctl s390/pkey: add support for ecc clear key s390/pkey: do not use struct pkey_protkey s390/pkey: introduce reverse x-mas trees s390/zcore: conditionally clear memory on reipl s390/ipl: add REIPL_CLEAR flag to os_info vfio/ccw: use struct_size() helper vfio/ccw: replace one-element array with flexible-array member s390: select ARCH_SUPPORTS_INT128 s390/pai_ext: replace atomic_t with refcount_t s390/pai_crypto: replace atomic_t with refcount_t
| * s390/ipl: add REIPL_CLEAR flag to os_infoMikhail Zaslonko2023-06-011-0/+16
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Introduce new OS_INFO_FLAGS_ENTRY to os_info pointing to the field with bit flags. Add OS_INFO_FLAGS_ENTRY upon dump_reipl shutdown action processing and set OS_INFO_FLAG_REIPL_CLEAR flag indicating 'clear' sysfs attribute has been set on the panicked system for specified ipl type. This flag can be used to inform the dumper whether LOAD_CLEAR or LOAD_NORMAL diag308 subcode to be used for ipl after dumping the memory. Signed-off-by: Mikhail Zaslonko <zaslonko@linux.ibm.com> Acked-by: Alexander Gordeev <agordeev@linux.ibm.com> Reviewed-by: Heiko Carstens <hca@linux.ibm.com> Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
* | s390/ipl: fix IPIB virtual vs physical address confusionAlexander Gordeev2023-05-151-2/+1
|/ | | | | | | | | | | | | | The pointer to IPL Parameter Information Block is stored in the absolute lowcore for later use by dump tools. That pointer is a virtual address, though it should be physical instead. Note, this does not fix a real issue, since virtual and physical addresses are currently the same. Suggested-by: Heiko Carstens <hca@linux.ibm.com> Reviewed-by: Heiko Carstens <hca@linux.ibm.com> Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
* s390/ipl: fix physical-virtual confusion for diag308Nico Boehr2023-04-131-3/+3
| | | | | | | | | | | | | | | | | | Diag 308 subcodes expect a physical address as their parameter. This currently is not a bug, but in the future physical and virtual addresses might differ. Fix the confusion by doing a virtual-to-physical conversion in the exported diag308() and leave the assembly wrapper __diag308() alone. Note that several callers pass NULL as addr, so check for the case when NULL is passed and pass 0 to hardware since virt_to_phys(0) might be nonzero. Suggested-by: Marc Hartmayer <mhartmay@linux.ibm.com> Signed-off-by: Nico Boehr <nrb@linux.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
* s390/bp: remove __bpon()Heiko Carstens2023-03-131-1/+0
| | | | | | | | | | There is no point in changing branch prediction state of a cpu shortly before it enters stop state. Therefore remove __bpon(). Acked-by: Alexander Gordeev <agordeev@linux.ibm.com> Reviewed-by: Sven Schnelle <svens@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
* s390/ipl: add loadparm parameter to eckd ipl/reipl dataSven Schnelle2023-02-061-0/+3
| | | | | | | | | | | commit 87fd22e0ae92 ("s390/ipl: add eckd support") missed to add the loadparm attribute to the new eckd ipl/reipl data. Fixes: 87fd22e0ae92 ("s390/ipl: add eckd support") Cc: <stable@vger.kernel.org> Signed-off-by: Sven Schnelle <svens@linux.ibm.com> Reviewed-by: Heiko Carstens <hca@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
* s390/ipl: add DEFINE_GENERIC_LOADPARM()Sven Schnelle2023-02-061-71/+20
| | | | | | | | | | | In the current code each reipl type implements its own pair of loadparm show/store functions. Add a macro to deduplicate the code a bit. Reviewed-by: Heiko Carstens <hca@linux.ibm.com> Signed-off-by: Sven Schnelle <svens@linux.ibm.com> Fixes: 87fd22e0ae92 ("s390/ipl: add eckd support") Cc: <stable@vger.kernel.org> Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
* s390/ipl: use kstrtobool() instead of strtobool()Christophe JAILLET2023-01-221-1/+1
| | | | | | | | | | | | strtobool() is the same as kstrtobool(). However, the latter is more used within the kernel. In order to remove strtobool() and slightly simplify kstrtox.h, switch to the other function name. Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr> Link: https://lore.kernel.org/r/58a3ed2e21903a93dfd742943b1e6936863ca037.1673708887.git.christophe.jaillet@wanadoo.fr Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
* s390/mm: allocate Absolute Lowcore Area in decompressorAlexander Gordeev2023-01-131-3/+2
| | | | | | | | | | | Move Absolute Lowcore Area allocation to the decompressor. As result, get_abs_lowcore() and put_abs_lowcore() access brackets become really straight and do not require complex execution context analysis and LAP and interrupts tackling. Reviewed-by: Heiko Carstens <hca@linux.ibm.com> Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
* s390/ipl: use octal values instead of S_* macrosSven Schnelle2022-12-061-36/+30
| | | | | | | | | octal values are easier to read and checkpatch also recommends to use them, so replace all the S_* macros with their counterparts. Signed-off-by: Sven Schnelle <svens@linux.ibm.com> Reviewed-by: Heiko Carstens <hca@linux.ibm.com> Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
* s390/ipl: add eckd dump supportSven Schnelle2022-12-061-1/+71
| | | | | | | | | | This adds support to use ECKD disks as dump device to linux. The new dump type is called 'eckd_dump', parameters are the same as for eckd ipl. Signed-off-by: Sven Schnelle <svens@linux.ibm.com> Reviewed-by: Vasily Gorbik <gor@linux.ibm.com> Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
* s390/ipl: add eckd supportSven Schnelle2022-12-061-0/+282
| | | | | | | | | | | | | | | | | | | This adds support to IPL from ECKD DASDs to linux. It introduces a few sysfs files in /sys/firmware/reipl/eckd: bootprog: the boot program selector clear: whether to issue a diag308 LOAD_NORMAL or LOAD_CLEAR device: the device to ipl from br_chr: Cylinder/Head/Record number to read the bootrecord from. Might be '0' or 'auto' if it should be read from the volume label. scpdata: data to be passed to the ipl'd program. The new ipl type is called 'eckd'. Signed-off-by: Sven Schnelle <svens@linux.ibm.com> Reviewed-by: Vasily Gorbik <gor@linux.ibm.com> Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
* s390/ipl: Use kstrtobool() instead of strtobool()Christophe JAILLET2022-11-231-3/+4
| | | | | | | | | | | | | | strtobool() is the same as kstrtobool(). However, the latter is more used within the kernel. In order to remove strtobool() and slightly simplify kstrtox.h, switch to the other function name. While at it, include the corresponding header file (<linux/kstrtox.h>) Link: https://lore.kernel.org/all/cover.1667336095.git.christophe.jaillet@wanadoo.fr/ Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr> Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
* s390/smp: rework absolute lowcore accessAlexander Gordeev2022-09-141-2/+7
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Temporary unsetting of the prefix page in memcpy_absolute() routine poses a risk of executing code path with unexpectedly disabled prefix page. This rework avoids the prefix page uninstalling and disabling of normal and machine check interrupts when accessing the absolute zero memory. Although memcpy_absolute() routine can access the whole memory, it is only used to update the absolute zero lowcore. This rework therefore introduces a new mechanism for the absolute zero lowcore access and scraps memcpy_absolute() routine for good. Instead, an area is reserved in the virtual memory that is used for the absolute lowcore access only. That area holds an array of 8KB virtual mappings - one per CPU. Whenever a CPU is brought online, the corresponding item is mapped to the real address of the previously installed prefix page. The absolute zero lowcore access works like this: a CPU calls the new primitive get_abs_lowcore() to obtain its 8KB mapping as a pointer to the struct lowcore. Virtual address references to that pointer get translated to the real addresses of the prefix page, which in turn gets swapped with the absolute zero memory addresses due to prefixing. Once the pointer is not needed it must be released with put_abs_lowcore() primitive: struct lowcore *abs_lc; unsigned long flags; abs_lc = get_abs_lowcore(&flags); abs_lc->... = ...; put_abs_lowcore(abs_lc, flags); To ensure the described mechanism works large segment- and region- table entries must be avoided for the 8KB mappings. Failure to do so results in usage of Region-Frame Absolute Address (RFAA) or Segment-Frame Absolute Address (SFAA) large page fields. In that case absolute addresses would be used to address the prefix page instead of the real ones and the prefixing would get bypassed. Reviewed-by: Heiko Carstens <hca@linux.ibm.com> Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
* s390/maccess: rework absolute lowcore accessorsAlexander Gordeev2022-03-271-2/+2
| | | | | | | | | | | | Macro mem_assign_absolute() is able to access the whole memory, but is only used and makes sense when updating the absolute lowcore. Instead, introduce get_abs_lowcore() and put_abs_lowcore() macros that limit access to absolute lowcore addresses only. Suggested-by: Heiko Carstens <hca@linux.ibm.com> Reviewed-by: Heiko Carstens <hca@linux.ibm.com> Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
* s390/extable: move EX_TABLE define to asm-extable.hHeiko Carstens2022-03-081-0/+1
| | | | | | | | | | | | | | Follow arm64 and riscv and move the EX_TABLE define to asm-extable.h which is a lot less generic than the current linkage.h. Also make sure that all files which contain EX_TABLE usages actually include the new header file. This should make sure that the files always compile and there won't be any random compile breakage due to other header file dependencies. Reviewed-by: Alexander Gordeev <agordeev@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
* s390: remove invalid email address of Heiko CarstensHeiko Carstens2022-02-061-1/+0
| | | | | | | | | | | Remove my old invalid email address which can be found in a couple of files. Instead of updating it, just remove my contact data completely from source files. We have git and other tools which allow to figure out who is responsible for what with recent contact data. Signed-off-by: Heiko Carstens <hca@linux.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
* s390/kexec: fix return code handlingHeiko Carstens2021-11-181-1/+2
| | | | | | | | | | kexec_file_add_ipl_report ignores that ipl_report_finish may fail and can return an error pointer instead of a valid pointer. Fix this and simplify by returning NULL in case of an error and let the only caller handle this case. Fixes: 99feaa717e55 ("s390/kexec_file: Create ipl report and pass to next kernel") Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
* s390/smp: enable DAT before CPU restart callback is calledAlexander Gordeev2021-08-261-3/+0
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The restart interrupt is triggered whenever a secondary CPU is brought online, a remote function call dispatched from another CPU or a manual PSW restart is initiated and causes the system to kdump. The handling routine is always called with DAT turned off. It then initializes the stack frame and invokes a callback. The existing callbacks handle DAT as follows: * __do_restart() and __machine_kexec() turn in on upon entry; * __ipl_run(), __reipl_run() and __dump_run() do not turn it right away, but all of them call diag308() - which turns DAT on, but only if kasan is enabled; In addition to the described complexity all callbacks (and the functions they call) should avoid kasan instrumentation while DAT is off. This update enables DAT in the assembler restart handler and relieves any callbacks (which are mostly C functions) from dealing with DAT altogether. There are four types of CPU restart that initialize control registers in different ways: 1. Start of secondary CPU on boot - control registers are inherited from the IPL CPU; 2. Restart of online CPU - control registers of the CPU being restarted are kept; 3. Hotplug of offline CPU - control registers are inherited from the starting CPU; 4. Start of offline CPU triggered by manual PSW restart - the control registers are read from the absolute lowcore and contain the boot time IPL CPU values updated with all follow-up calls of smp_ctl_set_bit() and smp_ctl_clear_bit() routines; In first three cases contents of the control registers is the most recent. In the latter case control registers are good enough to facilitate successful completion of kdump operation. Suggested-by: Heiko Carstens <hca@linux.ibm.com> Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
* s390: rename dma section to amode31Heiko Carstens2021-08-051-1/+1
| | | | | | | | | | | | | | | | | | | The dma section name is confusing, since the code which resides within that section has nothing to do with direct memory access. Instead the limitation is that the code has to run in 31 bit addressing mode, and therefore has to reside below 2GB. So the name was chosen since ZONE_DMA is the same region. To reduce confusion rename the section to amode31, which hopefully describes better what this is about. Note: this will also change vmcoreinfo strings - SDMA=... gets renamed to SAMODE31=... - EDMA=... gets renamed to EAMODE31=... Acked-by: Vasily Gorbik <gor@linux.ibm.com> Reviewed-by: Alexander Egorenkov <egorenar@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
* Merge tag 's390-5.14-1' of ↵Linus Torvalds2021-07-041-6/+8
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux Pull s390 updates from Vasily Gorbik: - Rework inline asm to get rid of error prone "register asm" constructs, which are problematic especially when code instrumentation is enabled. In particular introduce and use register pair union to allocate even/odd register pairs. Unfortunately this breaks compatibility with older clang compilers and minimum clang version for s390 has been raised to 13. https://lore.kernel.org/linux-next/CAK7LNARuSmPCEy-ak0erPrPTgZdGVypBROFhtw+=3spoGoYsyw@mail.gmail.com/ - Fix gcc 11 warnings, which triggered various minor reworks all over the code. - Add zstd kernel image compression support. - Rework boot CPU lowcore handling. - De-duplicate and move kernel memory layout setup logic earlier. - Few fixes in preparation for FORTIFY_SOURCE performing compile-time and run-time field bounds checking for mem functions. - Remove broken and unused power management support leftovers in s390 drivers. - Disable stack-protector for decompressor and purgatory to fix buildroot build. - Fix vt220 sclp console name to match the char device name. - Enable HAVE_IOREMAP_PROT and add zpci_set_irq()/zpci_clear_irq() in zPCI code. - Remove some implausible WARN_ON_ONCEs and remove arch specific counter transaction call backs in favour of default transaction handling in perf code. - Extend/add new uevents for online/config/mode state changes of AP card / queue device in zcrypt. - Minor entry and ccwgroup code improvements. - Other small various fixes and improvements all over the code. * tag 's390-5.14-1' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux: (91 commits) s390/dasd: use register pair instead of register asm s390/qdio: get rid of register asm s390/ioasm: use symbolic names for asm operands s390/ioasm: get rid of register asm s390/cmf: get rid of register asm s390/lib,string: get rid of register asm s390/lib,uaccess: get rid of register asm s390/string: get rid of register asm s390/cmpxchg: use register pair instead of register asm s390/mm,pages-states: get rid of register asm s390/lib,xor: get rid of register asm s390/timex: get rid of register asm s390/hypfs: use register pair instead of register asm s390/zcrypt: Switch to flexible array member s390/speculation: Use statically initialized const for instructions virtio/s390: get rid of open-coded kvm hypercall s390/pci: add zpci_set_irq()/zpci_clear_irq() scripts/min-tool-version.sh: Raise minimum clang version to 13.0.0 for s390 s390/ipl: use register pair instead of register asm s390/mem_detect: fix tprot() program check new psw handling ...
| * s390/ipl: use register pair instead of register asmHeiko Carstens2021-06-181-6/+8
| | | | | | | | | | Signed-off-by: Heiko Carstens <hca@linux.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
* | kernel.h: split out panic and oops helpersAndy Shevchenko2021-07-011-0/+1
|/ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | kernel.h is being used as a dump for all kinds of stuff for a long time. Here is the attempt to start cleaning it up by splitting out panic and oops helpers. There are several purposes of doing this: - dropping dependency in bug.h - dropping a loop by moving out panic_notifier.h - unload kernel.h from something which has its own domain At the same time convert users tree-wide to use new headers, although for the time being include new header back to kernel.h to avoid twisted indirected includes for existing users. [akpm@linux-foundation.org: thread_info.h needs limits.h] [andriy.shevchenko@linux.intel.com: ia64 fix] Link: https://lkml.kernel.org/r/20210520130557.55277-1-andriy.shevchenko@linux.intel.com Link: https://lkml.kernel.org/r/20210511074137.33666-1-andriy.shevchenko@linux.intel.com Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org> Co-developed-by: Andrew Morton <akpm@linux-foundation.org> Acked-by: Mike Rapoport <rppt@linux.ibm.com> Acked-by: Corey Minyard <cminyard@mvista.com> Acked-by: Christian Brauner <christian.brauner@ubuntu.com> Acked-by: Arnd Bergmann <arnd@arndb.de> Acked-by: Kees Cook <keescook@chromium.org> Acked-by: Wei Liu <wei.liu@kernel.org> Acked-by: Rasmus Villemoes <linux@rasmusvillemoes.dk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Acked-by: Sebastian Reichel <sre@kernel.org> Acked-by: Luis Chamberlain <mcgrof@kernel.org> Acked-by: Stephen Boyd <sboyd@kernel.org> Acked-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de> Acked-by: Helge Deller <deller@gmx.de> # parisc Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* s390/smp: fix do_restart() prototypeAlexander Gordeev2021-04-181-2/+2
| | | | | | | | Funciton do_restart() is a callback invoked from the restart CPU routine and passed a single parameter. Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
* s390/delay: remove udelay_simple()Heiko Carstens2020-12-161-1/+1
| | | | | | | udelay_simple() callers can make use of the now simplified udelay() implementation. No need to keep it. Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
* s390/ipl: add support to control memory clearing for nvme re-IPLGerald Schaefer2020-10-021-6/+42
| | | | | | | | | | | | | | | | | | | Re-IPL for nvme is currently done by using diag 308 with the "Load Clear" subcode, which means that all memory will be cleared. This can increase re-IPL duration considerably on very large machines. For list-directed IPL like nvme or fcp IPL, a "Load Normal" subcode was introduced with z14. The "Load Normal" diag 308 subcode allows to re-IPL without clearing memory. This patch adds a new "clear" sysfs attribute to /sys/firmware/reipl/nvme, which can be set to either "0" or "1" to disable or enable re-IPL with memory clearing. The default value is "0", which disables memory clearing. Signed-off-by: Gerald Schaefer <gerald.schaefer@de.ibm.com> Reviewed-by: Vasily Gorbik <gor@linux.ibm.com> Tested-by: Alexander Egorenkov <egorenar@linux.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
* s390: nvme dump supportJason J. Herne2020-10-021-1/+70
| | | | | | | | Add the nvme dump ipl type, associated data, and sysfs entries. This allows booting into a stand alone dump environment that resides on an nvme device. Signed-off-by: Jason J. Herne <jjherne@linux.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
* s390: use scnprintf() in sys_##_prefix##_##_name##_showChen Zhou2020-06-161-1/+1
| | | | | | | | | | | | | snprintf() returns the number of bytes that would be written, which may be greater than the the actual length to be written. show() methods should return the number of bytes printed into the buffer. This is the return value of scnprintf(). Link: https://lkml.kernel.org/r/20200509085608.41061-3-chenzhou10@huawei.com Signed-off-by: Chen Zhou <chenzhou10@huawei.com> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
* s390: nvme reiplJason J. Herne2020-05-061-1/+147
| | | | | | | | Populate sysfs and structs with reipl entries for nvme ipl type. This allows specifying a target nvme device when rebooting/reipling. Signed-off-by: Jason J. Herne <jjherne@linux.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
* s390: nvme iplJason J. Herne2020-05-061-0/+63
| | | | | | | | Recognize IPL Block's Ipl Type of "nvme". Populate related structs and sysfs entries. Signed-off-by: Jason J. Herne <jjherne@linux.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
* s390/ipl: add support to control memory clearing for FCP and CCW re-IPLGerald Schaefer2020-03-231-7/+66
| | | | | | | | | | | | | | | | | | | | Re-IPL for both CCW and FCP is currently done by using diag 308 with the "Load Clear" subcode, which means that all memory will be cleared. This can increase re-IPL duration considerably on very large machines. For CCW devices, there is also a "Load Normal" subcode that was only used for dump kernels so far. For FCP devices, a similar "Load Normal" subcode was introduced with z14. The "Load Normal" diag 308 subcode allows to re-IPL without clearing memory. This patch adds a new "clear" sysfs attribute to /sys/firmware/reipl for both the ccw and fcp subdirectories, which can be set to either "0" or "1" to disable or enable re-IPL with memory clearing. The default value is "0", which disables memory clearing. Signed-off-by: Gerald Schaefer <gerald.schaefer@de.ibm.com> Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
* s390/protvirt: avoid memory sharing for diag 308 set/storeVasily Gorbik2019-08-061-9/+0
| | | | | | | | | | This reverts commit db9492cef45e ("s390/protvirt: add memory sharing for diag 308 set/store") which due to ultravisor implementation change is not needed after all. Fixes: db9492cef45e ("s390/protvirt: add memory sharing for diag 308 set/store") Reviewed-by: Janosch Frank <frankja@linux.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
* s390/ipl: Fix detection of has_secure attributePhilipp Rudo2019-07-111-6/+1
| | | | | | | | | | | | | | Use the correct bit for detection of the machine capability associated with the has_secure attribute. It is expected that the underlying platform (including hypervisors) unsets the bit when they don't provide secure ipl for their guests. Fixes: c9896acc7851 ("s390/ipl: Provide has_secure sysfs attribute") Cc: stable@vger.kernel.org # 5.2 Signed-off-by: Philipp Rudo <prudo@linux.ibm.com> Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com> Reviewed-by: Peter Oberparleiter <oberpar@linux.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
* s390: simplify disabled_waitMartin Schwidefsky2019-05-021-2/+2
| | | | | | | | | | | | | | | | | | | The disabled_wait() function uses its argument as the PSW address when it stops the CPU with a wait PSW that is disabled for interrupts. The different callers sometimes use a specific number like 0xdeadbeef to indicate a specific failure, the early boot code uses 0 and some other calls sites use __builtin_return_address(0). At the time a dump is created the current PSW and the registers of a CPU are written to lowcore to make them avaiable to the dump analysis tool. For a CPU stopped with disabled_wait the PSW and the registers do not really make sense together, the PSW address does not point to the function the registers belong to. Simplify disabled_wait() by using _THIS_IP_ for the PSW address and drop the argument to the function. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* s390/kernel: introduce .dma sectionsGerald Schaefer2019-04-291-1/+1
| | | | | | | | | | | | | | | | | | | | | | | With a relocatable kernel that could reside at any place in memory, code and data that has to stay below 2 GB needs special handling. This patch introduces .dma sections for such text, data and ex_table. The sections will be part of the decompressor kernel, so they will not be relocated and stay below 2 GB. Their location is passed over to the decompressed / relocated kernel via the .boot.preserved.data section. The duald and aste for control register setup also need to stay below 2 GB, so move the setup code from arch/s390/kernel/head64.S to arch/s390/boot/head.S. The duct and linkage_stack could reside above 2 GB, but their content has to be preserved for the decompresed kernel, so they are also moved into the .dma section. The start and end address of the .dma sections is added to vmcoreinfo, for crash support, to help debugging in case the kernel crashed there. Signed-off-by: Gerald Schaefer <gerald.schaefer@de.ibm.com> Reviewed-by: Philipp Rudo <prudo@linux.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* s390/ipl: Provide has_secure sysfs attributePhilipp Rudo2019-04-291-0/+17
| | | | | | | | | Provide an interface for userspace so it can find out if a machine is capeable of doing secure boot. The interface is, for example, needed for zipl so it can find out which file format it can/should write to disk. Signed-off-by: Philipp Rudo <prudo@linux.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* s390/ipl: add helper functions to create an IPL reportMartin Schwidefsky2019-04-261-0/+134
| | | | | | | | PR: Adjusted to the use in kexec_file later. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Philipp Rudo <prudo@linux.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* s390/ipl: read IPL report at early bootMartin Schwidefsky2019-04-261-0/+19
| | | | | | | | | | | | | Read the IPL Report block provided by secure-boot, add the entries of the certificate list to the system key ring and print the list of components. PR: Adjust to Vasilys bootdata_preserved patch set. Preserve ipl_cert_list for later use in kexec_file. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Philipp Rudo <prudo@linux.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* s390/ipl: provide uapi header for list directed IPLMartin Schwidefsky2019-04-261-41/+39
| | | | | | | | | | The IPL parameter block is used as an interface between Linux and the machine to query and change the boot device and boot options. To be able to create IPL parameter block in user space and pass it as segment to kexec provide an uapi header with proper structure definitions for the block. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* s390/ipl: make ipl_info less confusingMartin Schwidefsky2019-04-261-56/+54
| | | | | | | | | | The ipl_info union in struct ipl_parameter_block has the same name as the struct ipl_info. This does not help while reading the code and the union in struct ipl_parameter_block does not need to be named. Drop the name from the union. Reviewed-by: Hendrik Brueckner <brueckner@linux.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* s390/protvirt: add memory sharing for diag 308 set/storeVasily Gorbik2019-04-101-0/+9
| | | | | | | | Add sharing of ipl parameter block for diag 308 set/store calls to allow kvm access in protected virtualization environment. Signed-off-by: Vasily Gorbik <gor@linux.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* s390: move ipl block to .boot.preserved.data sectionVasily Gorbik2019-04-101-13/+2
| | | | | | | | | | .boot.preserved.data is a better fit for ipl block than .boot.data which is discarded after init. Reusing .boot.preserved.data allows to simplify code a little bit and avoid copying data from .boot.data to persistent variables. Signed-off-by: Vasily Gorbik <gor@linux.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* s390/kasan: reipl and kexec supportVasily Gorbik2018-10-091-0/+2
| | | | | | | | | | | | | | | | Some functions from both arch/s390/kernel/ipl.c and arch/s390/kernel/machine_kexec.c are called without DAT enabled (or with and without DAT enabled code paths). There is no easy way to partially disable kasan for those files without a substantial rework. Disable kasan for both files for now. To avoid disabling kasan for arch/s390/kernel/diag.c DAT flag is enabled in diag308 call. pcpu_delegate which disables DAT is marked with __no_sanitize_address to disable instrumentation for that one function. Signed-off-by: Vasily Gorbik <gor@linux.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* s390: move ipl block and cmd line handling to early boot phaseVasily Gorbik2018-10-091-106/+11
| | | | | | | | | | | | | | | | To distinguish zfcpdump case and to be able to parse some of the kernel command line arguments early (e.g. mem=) ipl block retrieval and command line construction code is moved to the early boot phase. "memory_end" is set up correctly respecting "mem=" and hsa_size in case of the zfcpdump. arch/s390/boot/string.c is introduced to provide string handling and command line parsing functions to early boot phase code for the compressed kernel image case. Signed-off-by: Vasily Gorbik <gor@linux.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* s390/ipl: remove reipl_method and dump_methodVasily Gorbik2018-04-101-46/+11
| | | | | | | | | | | | | reipl_method and dump_method have been used in addition to reipl_type and dump_type, because a single reipl_type could be achieved with multiple reipl_method (same for dump_type/method). After dropping non-diag308_set based reipl methods, there is a single method per reipl_type/dump_type and reipl_method and dump_method could be simply removed. Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* s390/ipl: correct kdump reipl block checksum calculationVasily Gorbik2018-04-101-6/+5
| | | | | | | | | | | | | | | | | | | | | | s390 kdump reipl implementation relies on os_info kernel structure residing in old memory being dumped. os_info contains reipl block, which is used (if valid) by the kdump kernel for reipl parameters. The problem is that the reipl block and its checksum inside os_info is updated only when /sys/firmware/reipl/reipl_type is written. This sets an offset of a reipl block for "reipl_type" and re-calculates reipl block checksum. Any further alteration of values under /sys/firmware/reipl/{reipl_type}/ without subsequent write to /sys/firmware/reipl/reipl_type lead to incorrect os_info reipl block checksum. In such a case kdump kernel ignores it and reboots using default logic. To fix this, os_info reipl block update is moved right before kdump execution. Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* s390: assume diag308 set always worksVasily Gorbik2018-04-101-198/+11
| | | | | | | | | | | | | | diag308 set has been available for many machine generations, and alternative reipl code paths has not been exercised and seems to be broken without noticing for a while now. So, cleaning up all obsolete reipl methods except currently used ones, assuming that diag308 set always works. Also removing not longer needed reset callbacks. Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* s390/ipl: avoid adding scpdata to cmdline during ftp/dvd bootVasily Gorbik2018-04-101-1/+1
| | | | | | | | Add missing ipl parmblock validity check to append_ipl_scpdata. Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* s390/ipl: correct ipl parmblock valid checksVasily Gorbik2018-04-101-6/+4
| | | | | | | | | | | In some cases diag308_set_works used to be misused as "we have valid ipl parmblock", which is not the case when diag308 set works, but there is no ipl parmblock (diag308 store returns DIAG308_RC_NOCONFIG). Such checks are adjusted to reuse ipl_block_valid instead of diag308_set_works. Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* s390/ipl: rely on diag308 store to get ipl infoVasily Gorbik2018-04-101-38/+15
| | | | | | | | | | For both ccw and fcp boot retrieve ipl info from ipl block received via diag308 store. Old scsi ipl parm block handling and cio_get_iplinfo are removed. Ipl type is deducted from ipl block (if valid). Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
generated by cgit v1.2.3 (git 2.39.1) at 2025-01-14 14:51:58 +0100