Version:  2.0.40 2.2.26 2.4.37 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8

Linux/arch/s390/Kconfig

  1 config MMU
  2         def_bool y
  3 
  4 config ZONE_DMA
  5         def_bool y
  6 
  7 config CPU_BIG_ENDIAN
  8         def_bool y
  9 
 10 config LOCKDEP_SUPPORT
 11         def_bool y
 12 
 13 config STACKTRACE_SUPPORT
 14         def_bool y
 15 
 16 config RWSEM_GENERIC_SPINLOCK
 17         bool
 18 
 19 config RWSEM_XCHGADD_ALGORITHM
 20         def_bool y
 21 
 22 config ARCH_HAS_ILOG2_U32
 23         def_bool n
 24 
 25 config ARCH_HAS_ILOG2_U64
 26         def_bool n
 27 
 28 config GENERIC_HWEIGHT
 29         def_bool y
 30 
 31 config GENERIC_BUG
 32         def_bool y if BUG
 33 
 34 config GENERIC_BUG_RELATIVE_POINTERS
 35         def_bool y
 36 
 37 config ARCH_DMA_ADDR_T_64BIT
 38         def_bool y
 39 
 40 config GENERIC_LOCKBREAK
 41         def_bool y if SMP && PREEMPT
 42 
 43 config PGSTE
 44         def_bool y if KVM
 45 
 46 config ARCH_SUPPORTS_DEBUG_PAGEALLOC
 47         def_bool y
 48 
 49 config KEXEC
 50         def_bool y
 51         select KEXEC_CORE
 52 
 53 config AUDIT_ARCH
 54         def_bool y
 55 
 56 config NO_IOPORT_MAP
 57         def_bool y
 58 
 59 config PCI_QUIRKS
 60         def_bool n
 61 
 62 config ARCH_SUPPORTS_UPROBES
 63         def_bool y
 64 
 65 config DEBUG_RODATA
 66         def_bool y
 67 
 68 config S390
 69         def_bool y
 70         select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
 71         select ARCH_HAS_DEVMEM_IS_ALLOWED
 72         select ARCH_HAS_ELF_RANDOMIZE
 73         select ARCH_HAS_GCOV_PROFILE_ALL
 74         select ARCH_HAS_KCOV
 75         select ARCH_HAS_SG_CHAIN
 76         select ARCH_HAVE_NMI_SAFE_CMPXCHG
 77         select ARCH_INLINE_READ_LOCK
 78         select ARCH_INLINE_READ_LOCK_BH
 79         select ARCH_INLINE_READ_LOCK_IRQ
 80         select ARCH_INLINE_READ_LOCK_IRQSAVE
 81         select ARCH_INLINE_READ_TRYLOCK
 82         select ARCH_INLINE_READ_UNLOCK
 83         select ARCH_INLINE_READ_UNLOCK_BH
 84         select ARCH_INLINE_READ_UNLOCK_IRQ
 85         select ARCH_INLINE_READ_UNLOCK_IRQRESTORE
 86         select ARCH_INLINE_SPIN_LOCK
 87         select ARCH_INLINE_SPIN_LOCK_BH
 88         select ARCH_INLINE_SPIN_LOCK_IRQ
 89         select ARCH_INLINE_SPIN_LOCK_IRQSAVE
 90         select ARCH_INLINE_SPIN_TRYLOCK
 91         select ARCH_INLINE_SPIN_TRYLOCK_BH
 92         select ARCH_INLINE_SPIN_UNLOCK
 93         select ARCH_INLINE_SPIN_UNLOCK_BH
 94         select ARCH_INLINE_SPIN_UNLOCK_IRQ
 95         select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE
 96         select ARCH_INLINE_WRITE_LOCK
 97         select ARCH_INLINE_WRITE_LOCK_BH
 98         select ARCH_INLINE_WRITE_LOCK_IRQ
 99         select ARCH_INLINE_WRITE_LOCK_IRQSAVE
100         select ARCH_INLINE_WRITE_TRYLOCK
101         select ARCH_INLINE_WRITE_UNLOCK
102         select ARCH_INLINE_WRITE_UNLOCK_BH
103         select ARCH_INLINE_WRITE_UNLOCK_IRQ
104         select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE
105         select ARCH_SAVE_PAGE_KEYS if HIBERNATION
106         select ARCH_SUPPORTS_ATOMIC_RMW
107         select ARCH_SUPPORTS_NUMA_BALANCING
108         select ARCH_USE_BUILTIN_BSWAP
109         select ARCH_USE_CMPXCHG_LOCKREF
110         select ARCH_WANTS_DYNAMIC_TASK_STRUCT
111         select ARCH_WANTS_PROT_NUMA_PROT_NONE
112         select ARCH_WANT_IPC_PARSE_VERSION
113         select BUILDTIME_EXTABLE_SORT
114         select CLONE_BACKWARDS2
115         select DYNAMIC_FTRACE if FUNCTION_TRACER
116         select GENERIC_CLOCKEVENTS
117         select GENERIC_CPU_AUTOPROBE
118         select GENERIC_CPU_DEVICES if !SMP
119         select GENERIC_FIND_FIRST_BIT
120         select GENERIC_SMP_IDLE_THREAD
121         select GENERIC_TIME_VSYSCALL
122         select HAVE_ALIGNED_STRUCT_PAGE if SLUB
123         select HAVE_ARCH_AUDITSYSCALL
124         select HAVE_ARCH_EARLY_PFN_TO_NID
125         select HAVE_ARCH_HARDENED_USERCOPY
126         select HAVE_ARCH_JUMP_LABEL
127         select CPU_NO_EFFICIENT_FFS if !HAVE_MARCH_Z9_109_FEATURES
128         select HAVE_ARCH_SECCOMP_FILTER
129         select HAVE_ARCH_SOFT_DIRTY
130         select HAVE_ARCH_TRACEHOOK
131         select HAVE_ARCH_TRANSPARENT_HUGEPAGE
132         select HAVE_EBPF_JIT if PACK_STACK && HAVE_MARCH_Z196_FEATURES
133         select HAVE_CMPXCHG_DOUBLE
134         select HAVE_CMPXCHG_LOCAL
135         select HAVE_DEBUG_KMEMLEAK
136         select HAVE_DMA_API_DEBUG
137         select HAVE_DYNAMIC_FTRACE
138         select HAVE_DYNAMIC_FTRACE_WITH_REGS
139         select HAVE_EXIT_THREAD
140         select HAVE_FTRACE_MCOUNT_RECORD
141         select HAVE_FUNCTION_GRAPH_TRACER
142         select HAVE_FUNCTION_TRACER
143         select HAVE_FUTEX_CMPXCHG if FUTEX
144         select HAVE_KERNEL_BZIP2
145         select HAVE_KERNEL_GZIP
146         select HAVE_KERNEL_LZ4
147         select HAVE_KERNEL_LZMA
148         select HAVE_KERNEL_LZO
149         select HAVE_KERNEL_XZ
150         select HAVE_KPROBES
151         select HAVE_KRETPROBES
152         select HAVE_KVM
153         select HAVE_LIVEPATCH
154         select HAVE_MEMBLOCK
155         select HAVE_MEMBLOCK_NODE_MAP
156         select HAVE_MEMBLOCK_PHYS_MAP
157         select HAVE_MOD_ARCH_SPECIFIC
158         select HAVE_OPROFILE
159         select HAVE_PERF_EVENTS
160         select HAVE_REGS_AND_STACK_ACCESS_API
161         select HAVE_SYSCALL_TRACEPOINTS
162         select HAVE_VIRT_CPU_ACCOUNTING
163         select MODULES_USE_ELF_RELA
164         select NO_BOOTMEM
165         select OLD_SIGACTION
166         select OLD_SIGSUSPEND3
167         select SPARSE_IRQ
168         select SYSCTL_EXCEPTION_TRACE
169         select TTY
170         select VIRT_CPU_ACCOUNTING
171         select VIRT_TO_BUS
172         select HAVE_NMI
173 
174 
175 config SCHED_OMIT_FRAME_POINTER
176         def_bool y
177 
178 config PGTABLE_LEVELS
179         int
180         default 4
181 
182 source "init/Kconfig"
183 
184 source "kernel/Kconfig.freezer"
185 
186 source "kernel/livepatch/Kconfig"
187 
188 menu "Processor type and features"
189 
190 config HAVE_MARCH_Z900_FEATURES
191         def_bool n
192 
193 config HAVE_MARCH_Z990_FEATURES
194         def_bool n
195         select HAVE_MARCH_Z900_FEATURES
196 
197 config HAVE_MARCH_Z9_109_FEATURES
198         def_bool n
199         select HAVE_MARCH_Z990_FEATURES
200 
201 config HAVE_MARCH_Z10_FEATURES
202         def_bool n
203         select HAVE_MARCH_Z9_109_FEATURES
204 
205 config HAVE_MARCH_Z196_FEATURES
206         def_bool n
207         select HAVE_MARCH_Z10_FEATURES
208 
209 config HAVE_MARCH_ZEC12_FEATURES
210         def_bool n
211         select HAVE_MARCH_Z196_FEATURES
212 
213 config HAVE_MARCH_Z13_FEATURES
214         def_bool n
215         select HAVE_MARCH_ZEC12_FEATURES
216 
217 choice
218         prompt "Processor type"
219         default MARCH_Z196
220 
221 config MARCH_Z900
222         bool "IBM zSeries model z800 and z900"
223         select HAVE_MARCH_Z900_FEATURES
224         help
225           Select this to enable optimizations for model z800/z900 (2064 and
226           2066 series). This will enable some optimizations that are not
227           available on older ESA/390 (31 Bit) only CPUs.
228 
229 config MARCH_Z990
230         bool "IBM zSeries model z890 and z990"
231         select HAVE_MARCH_Z990_FEATURES
232         help
233           Select this to enable optimizations for model z890/z990 (2084 and
234           2086 series). The kernel will be slightly faster but will not work
235           on older machines.
236 
237 config MARCH_Z9_109
238         bool "IBM System z9"
239         select HAVE_MARCH_Z9_109_FEATURES
240         help
241           Select this to enable optimizations for IBM System z9 (2094 and
242           2096 series). The kernel will be slightly faster but will not work
243           on older machines.
244 
245 config MARCH_Z10
246         bool "IBM System z10"
247         select HAVE_MARCH_Z10_FEATURES
248         help
249           Select this to enable optimizations for IBM System z10 (2097 and
250           2098 series). The kernel will be slightly faster but will not work
251           on older machines.
252 
253 config MARCH_Z196
254         bool "IBM zEnterprise 114 and 196"
255         select HAVE_MARCH_Z196_FEATURES
256         help
257           Select this to enable optimizations for IBM zEnterprise 114 and 196
258           (2818 and 2817 series). The kernel will be slightly faster but will
259           not work on older machines.
260 
261 config MARCH_ZEC12
262         bool "IBM zBC12 and zEC12"
263         select HAVE_MARCH_ZEC12_FEATURES
264         help
265           Select this to enable optimizations for IBM zBC12 and zEC12 (2828 and
266           2827 series). The kernel will be slightly faster but will not work on
267           older machines.
268 
269 config MARCH_Z13
270         bool "IBM z13s and z13"
271         select HAVE_MARCH_Z13_FEATURES
272         help
273           Select this to enable optimizations for IBM z13s and z13 (2965 and
274           2964 series). The kernel will be slightly faster but will not work on
275           older machines.
276 
277 endchoice
278 
279 config MARCH_Z900_TUNE
280         def_bool TUNE_Z900 || MARCH_Z900 && TUNE_DEFAULT
281 
282 config MARCH_Z990_TUNE
283         def_bool TUNE_Z990 || MARCH_Z990 && TUNE_DEFAULT
284 
285 config MARCH_Z9_109_TUNE
286         def_bool TUNE_Z9_109 || MARCH_Z9_109 && TUNE_DEFAULT
287 
288 config MARCH_Z10_TUNE
289         def_bool TUNE_Z10 || MARCH_Z10 && TUNE_DEFAULT
290 
291 config MARCH_Z196_TUNE
292         def_bool TUNE_Z196 || MARCH_Z196 && TUNE_DEFAULT
293 
294 config MARCH_ZEC12_TUNE
295         def_bool TUNE_ZEC12 || MARCH_ZEC12 && TUNE_DEFAULT
296 
297 config MARCH_Z13_TUNE
298         def_bool TUNE_Z13 || MARCH_Z13 && TUNE_DEFAULT
299 
300 choice
301         prompt "Tune code generation"
302         default TUNE_DEFAULT
303         help
304           Cause the compiler to tune (-mtune) the generated code for a machine.
305           This will make the code run faster on the selected machine but
306           somewhat slower on other machines.
307           This option only changes how the compiler emits instructions, not the
308           selection of instructions itself, so the resulting kernel will run on
309           all other machines.
310 
311 config TUNE_DEFAULT
312         bool "Default"
313         help
314           Tune the generated code for the target processor for which the kernel
315           will be compiled.
316 
317 config TUNE_Z900
318         bool "IBM zSeries model z800 and z900"
319 
320 config TUNE_Z990
321         bool "IBM zSeries model z890 and z990"
322 
323 config TUNE_Z9_109
324         bool "IBM System z9"
325 
326 config TUNE_Z10
327         bool "IBM System z10"
328 
329 config TUNE_Z196
330         bool "IBM zEnterprise 114 and 196"
331 
332 config TUNE_ZEC12
333         bool "IBM zBC12 and zEC12"
334 
335 config TUNE_Z13
336         bool "IBM z13"
337 
338 endchoice
339 
340 config 64BIT
341         def_bool y
342 
343 config COMPAT
344         def_bool y
345         prompt "Kernel support for 31 bit emulation"
346         select COMPAT_BINFMT_ELF if BINFMT_ELF
347         select ARCH_WANT_OLD_COMPAT_IPC
348         select COMPAT_OLD_SIGACTION
349         depends on MULTIUSER
350         help
351           Select this option if you want to enable your system kernel to
352           handle system-calls from ELF binaries for 31 bit ESA.  This option
353           (and some other stuff like libraries and such) is needed for
354           executing 31 bit applications.  It is safe to say "Y".
355 
356 config SYSVIPC_COMPAT
357         def_bool y if COMPAT && SYSVIPC
358 
359 config KEYS_COMPAT
360         def_bool y if COMPAT && KEYS
361 
362 config SMP
363         def_bool y
364         prompt "Symmetric multi-processing support"
365         ---help---
366           This enables support for systems with more than one CPU. If you have
367           a system with only one CPU, like most personal computers, say N. If
368           you have a system with more than one CPU, say Y.
369 
370           If you say N here, the kernel will run on uni- and multiprocessor
371           machines, but will use only one CPU of a multiprocessor machine. If
372           you say Y here, the kernel will run on many, but not all,
373           uniprocessor machines. On a uniprocessor machine, the kernel
374           will run faster if you say N here.
375 
376           See also the SMP-HOWTO available at
377           <http://www.tldp.org/docs.html#howto>.
378 
379           Even if you don't know what to do here, say Y.
380 
381 config NR_CPUS
382         int "Maximum number of CPUs (2-512)"
383         range 2 512
384         depends on SMP
385         default "64"
386         help
387           This allows you to specify the maximum number of CPUs which this
388           kernel will support. The maximum supported value is 512 and the
389           minimum value which makes sense is 2.
390 
391           This is purely to save memory - each supported CPU adds
392           approximately sixteen kilobytes to the kernel image.
393 
394 config HOTPLUG_CPU
395         def_bool y
396         prompt "Support for hot-pluggable CPUs"
397         depends on SMP
398         help
399           Say Y here to be able to turn CPUs off and on. CPUs
400           can be controlled through /sys/devices/system/cpu/cpu#.
401           Say N if you want to disable CPU hotplug.
402 
403 # Some NUMA nodes have memory ranges that span
404 # other nodes.  Even though a pfn is valid and
405 # between a node's start and end pfns, it may not
406 # reside on that node.  See memmap_init_zone()
407 # for details. <- They meant memory holes!
408 config NODES_SPAN_OTHER_NODES
409         def_bool NUMA
410 
411 config NUMA
412         bool "NUMA support"
413         depends on SMP && SCHED_TOPOLOGY
414         default n
415         help
416           Enable NUMA support
417 
418           This option adds NUMA support to the kernel.
419 
420           An operation mode can be selected by appending
421           numa=<method> to the kernel command line.
422 
423           The default behaviour is identical to appending numa=plain to
424           the command line. This will create just one node with all
425           available memory and all CPUs in it.
426 
427 config NODES_SHIFT
428         int "Maximum NUMA nodes (as a power of 2)"
429         range 1 10
430         depends on NUMA
431         default "4"
432         help
433           Specify the maximum number of NUMA nodes available on the target
434           system. Increases memory reserved to accommodate various tables.
435 
436 menu "Select NUMA modes"
437         depends on NUMA
438 
439 config NUMA_EMU
440         bool "NUMA emulation"
441         default y
442         help
443           Numa emulation mode will split the available system memory into
444           equal chunks which then are distributed over the configured number
445           of nodes in a round-robin manner.
446 
447           The number of fake nodes is limited by the number of available memory
448           chunks (i.e. memory size / fake size) and the number of supported
449           nodes in the kernel.
450 
451           The CPUs are assigned to the nodes in a way that partially respects
452           the original machine topology (if supported by the machine).
453           Fair distribution of the CPUs is not guaranteed.
454 
455 config EMU_SIZE
456         hex "NUMA emulation memory chunk size"
457         default 0x10000000
458         range 0x400000 0x100000000
459         depends on NUMA_EMU
460         help
461           Select the default size by which the memory is chopped and then
462           assigned to emulated NUMA nodes.
463 
464           This can be overridden by specifying
465 
466           emu_size=<n>
467 
468           on the kernel command line where also suffixes K, M, G, and T are
469           supported.
470 
471 endmenu
472 
473 config SCHED_SMT
474         def_bool n
475 
476 config SCHED_MC
477         def_bool n
478 
479 config SCHED_BOOK
480         def_bool n
481 
482 config SCHED_DRAWER
483         def_bool n
484 
485 config SCHED_TOPOLOGY
486         def_bool y
487         prompt "Topology scheduler support"
488         depends on SMP
489         select SCHED_SMT
490         select SCHED_MC
491         select SCHED_BOOK
492         select SCHED_DRAWER
493         help
494           Topology scheduler support improves the CPU scheduler's decision
495           making when dealing with machines that have multi-threading,
496           multiple cores or multiple books.
497 
498 source kernel/Kconfig.preempt
499 
500 source kernel/Kconfig.hz
501 
502 endmenu
503 
504 menu "Memory setup"
505 
506 config ARCH_SPARSEMEM_ENABLE
507         def_bool y
508         select SPARSEMEM_VMEMMAP_ENABLE
509         select SPARSEMEM_VMEMMAP
510 
511 config ARCH_SPARSEMEM_DEFAULT
512         def_bool y
513 
514 config ARCH_SELECT_MEMORY_MODEL
515         def_bool y
516 
517 config ARCH_ENABLE_MEMORY_HOTPLUG
518         def_bool y if SPARSEMEM
519 
520 config ARCH_ENABLE_MEMORY_HOTREMOVE
521         def_bool y
522 
523 config ARCH_ENABLE_SPLIT_PMD_PTLOCK
524         def_bool y
525 
526 config FORCE_MAX_ZONEORDER
527         int
528         default "9"
529 
530 source "mm/Kconfig"
531 
532 config PACK_STACK
533         def_bool y
534         prompt "Pack kernel stack"
535         help
536           This option enables the compiler option -mkernel-backchain if it
537           is available. If the option is available the compiler supports
538           the new stack layout which dramatically reduces the minimum stack
539           frame size. With an old compiler a non-leaf function needs a
540           minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
541           -mkernel-backchain the minimum size drops to 16 byte on 31 bit
542           and 24 byte on 64 bit.
543 
544           Say Y if you are unsure.
545 
546 config CHECK_STACK
547         def_bool y
548         prompt "Detect kernel stack overflow"
549         help
550           This option enables the compiler option -mstack-guard and
551           -mstack-size if they are available. If the compiler supports them
552           it will emit additional code to each function prolog to trigger
553           an illegal operation if the kernel stack is about to overflow.
554 
555           Say N if you are unsure.
556 
557 config STACK_GUARD
558         int "Size of the guard area (128-1024)"
559         range 128 1024
560         depends on CHECK_STACK
561         default "256"
562         help
563           This allows you to specify the size of the guard area at the lower
564           end of the kernel stack. If the kernel stack points into the guard
565           area on function entry an illegal operation is triggered. The size
566           needs to be a power of 2. Please keep in mind that the size of an
567           interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
568           The minimum size for the stack guard should be 256 for 31 bit and
569           512 for 64 bit.
570 
571 config WARN_DYNAMIC_STACK
572         def_bool n
573         prompt "Emit compiler warnings for function with dynamic stack usage"
574         help
575           This option enables the compiler option -mwarn-dynamicstack. If the
576           compiler supports this options generates warnings for functions
577           that dynamically allocate stack space using alloca.
578 
579           Say N if you are unsure.
580 
581 endmenu
582 
583 menu "I/O subsystem"
584 
585 config QDIO
586         def_tristate y
587         prompt "QDIO support"
588         ---help---
589           This driver provides the Queued Direct I/O base support for
590           IBM System z.
591 
592           To compile this driver as a module, choose M here: the
593           module will be called qdio.
594 
595           If unsure, say Y.
596 
597 menuconfig PCI
598         bool "PCI support"
599         select PCI_MSI
600         select IOMMU_SUPPORT
601         help
602           Enable PCI support.
603 
604 if PCI
605 
606 config PCI_NR_FUNCTIONS
607         int "Maximum number of PCI functions (1-4096)"
608         range 1 4096
609         default "64"
610         help
611           This allows you to specify the maximum number of PCI functions which
612           this kernel will support.
613 
614 source "drivers/pci/Kconfig"
615 
616 endif   # PCI
617 
618 config PCI_DOMAINS
619         def_bool PCI
620 
621 config HAS_IOMEM
622         def_bool PCI
623 
624 config IOMMU_HELPER
625         def_bool PCI
626 
627 config NEED_SG_DMA_LENGTH
628         def_bool PCI
629 
630 config NEED_DMA_MAP_STATE
631         def_bool PCI
632 
633 config CHSC_SCH
634         def_tristate m
635         prompt "Support for CHSC subchannels"
636         help
637           This driver allows usage of CHSC subchannels. A CHSC subchannel
638           is usually present on LPAR only.
639           The driver creates a device /dev/chsc, which may be used to
640           obtain I/O configuration information about the machine and
641           to issue asynchronous chsc commands (DANGEROUS).
642           You will usually only want to use this interface on a special
643           LPAR designated for system management.
644 
645           To compile this driver as a module, choose M here: the
646           module will be called chsc_sch.
647 
648           If unsure, say N.
649 
650 config SCM_BUS
651         def_bool y
652         prompt "SCM bus driver"
653         help
654           Bus driver for Storage Class Memory.
655 
656 config EADM_SCH
657         def_tristate m
658         prompt "Support for EADM subchannels"
659         depends on SCM_BUS
660         help
661           This driver allows usage of EADM subchannels. EADM subchannels act
662           as a communication vehicle for SCM increments.
663 
664           To compile this driver as a module, choose M here: the
665           module will be called eadm_sch.
666 
667 endmenu
668 
669 menu "Dump support"
670 
671 config CRASH_DUMP
672         bool "kernel crash dumps"
673         depends on SMP
674         select KEXEC
675         help
676           Generate crash dump after being started by kexec.
677           Crash dump kernels are loaded in the main kernel with kexec-tools
678           into a specially reserved region and then later executed after
679           a crash by kdump/kexec.
680           Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this.
681           This option also enables s390 zfcpdump.
682           See also <file:Documentation/s390/zfcpdump.txt>
683 
684 endmenu
685 
686 menu "Executable file formats / Emulations"
687 
688 source "fs/Kconfig.binfmt"
689 
690 config SECCOMP
691         def_bool y
692         prompt "Enable seccomp to safely compute untrusted bytecode"
693         depends on PROC_FS
694         help
695           This kernel feature is useful for number crunching applications
696           that may need to compute untrusted bytecode during their
697           execution. By using pipes or other transports made available to
698           the process as file descriptors supporting the read/write
699           syscalls, it's possible to isolate those applications in
700           their own address space using seccomp. Once seccomp is
701           enabled via /proc/<pid>/seccomp, it cannot be disabled
702           and the task is only allowed to execute a few safe syscalls
703           defined by each seccomp mode.
704 
705           If unsure, say Y.
706 
707 endmenu
708 
709 menu "Power Management"
710 
711 config ARCH_HIBERNATION_POSSIBLE
712         def_bool y
713 
714 source "kernel/power/Kconfig"
715 
716 endmenu
717 
718 source "net/Kconfig"
719 
720 config PCMCIA
721         def_bool n
722 
723 config CCW
724         def_bool y
725 
726 source "drivers/Kconfig"
727 
728 source "fs/Kconfig"
729 
730 source "arch/s390/Kconfig.debug"
731 
732 source "security/Kconfig"
733 
734 source "crypto/Kconfig"
735 
736 source "lib/Kconfig"
737 
738 menu "Virtualization"
739 
740 config PFAULT
741         def_bool y
742         prompt "Pseudo page fault support"
743         help
744           Select this option, if you want to use PFAULT pseudo page fault
745           handling under VM. If running native or in LPAR, this option
746           has no effect. If your VM does not support PFAULT, PAGEEX
747           pseudo page fault handling will be used.
748           Note that VM 4.2 supports PFAULT but has a bug in its
749           implementation that causes some problems.
750           Everybody who wants to run Linux under VM != VM4.2 should select
751           this option.
752 
753 config SHARED_KERNEL
754         bool "VM shared kernel support"
755         depends on !JUMP_LABEL
756         help
757           Select this option, if you want to share the text segment of the
758           Linux kernel between different VM guests. This reduces memory
759           usage with lots of guests but greatly increases kernel size.
760           Also if a kernel was IPL'ed from a shared segment the kexec system
761           call will not work.
762           You should only select this option if you know what you are
763           doing and want to exploit this feature.
764 
765 config CMM
766         def_tristate n
767         prompt "Cooperative memory management"
768         help
769           Select this option, if you want to enable the kernel interface
770           to reduce the memory size of the system. This is accomplished
771           by allocating pages of memory and put them "on hold". This only
772           makes sense for a system running under VM where the unused pages
773           will be reused by VM for other guest systems. The interface
774           allows an external monitor to balance memory of many systems.
775           Everybody who wants to run Linux under VM should select this
776           option.
777 
778 config CMM_IUCV
779         def_bool y
780         prompt "IUCV special message interface to cooperative memory management"
781         depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
782         help
783           Select this option to enable the special message interface to
784           the cooperative memory management.
785 
786 config APPLDATA_BASE
787         def_bool n
788         prompt "Linux - VM Monitor Stream, base infrastructure"
789         depends on PROC_FS
790         help
791           This provides a kernel interface for creating and updating z/VM APPLDATA
792           monitor records. The monitor records are updated at certain time
793           intervals, once the timer is started.
794           Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
795           i.e. enables or disables monitoring on the Linux side.
796           A custom interval value (in seconds) can be written to
797           /proc/appldata/interval.
798 
799           Defaults are 60 seconds interval and timer off.
800           The /proc entries can also be read from, showing the current settings.
801 
802 config APPLDATA_MEM
803         def_tristate m
804         prompt "Monitor memory management statistics"
805         depends on APPLDATA_BASE && VM_EVENT_COUNTERS
806         help
807           This provides memory management related data to the Linux - VM Monitor
808           Stream, like paging/swapping rate, memory utilisation, etc.
809           Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
810           APPLDATA monitor record, i.e. enables or disables monitoring this record
811           on the z/VM side.
812 
813           Default is disabled.
814           The /proc entry can also be read from, showing the current settings.
815 
816           This can also be compiled as a module, which will be called
817           appldata_mem.o.
818 
819 config APPLDATA_OS
820         def_tristate m
821         prompt "Monitor OS statistics"
822         depends on APPLDATA_BASE
823         help
824           This provides OS related data to the Linux - VM Monitor Stream, like
825           CPU utilisation, etc.
826           Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
827           APPLDATA monitor record, i.e. enables or disables monitoring this record
828           on the z/VM side.
829 
830           Default is disabled.
831           This can also be compiled as a module, which will be called
832           appldata_os.o.
833 
834 config APPLDATA_NET_SUM
835         def_tristate m
836         prompt "Monitor overall network statistics"
837         depends on APPLDATA_BASE && NET
838         help
839           This provides network related data to the Linux - VM Monitor Stream,
840           currently there is only a total sum of network I/O statistics, no
841           per-interface data.
842           Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
843           APPLDATA monitor record, i.e. enables or disables monitoring this record
844           on the z/VM side.
845 
846           Default is disabled.
847           This can also be compiled as a module, which will be called
848           appldata_net_sum.o.
849 
850 config S390_HYPFS_FS
851         def_bool y
852         prompt "s390 hypervisor file system support"
853         select SYS_HYPERVISOR
854         help
855           This is a virtual file system intended to provide accounting
856           information in an s390 hypervisor environment.
857 
858 source "arch/s390/kvm/Kconfig"
859 
860 config S390_GUEST
861         def_bool y
862         prompt "s390 support for virtio devices"
863         select TTY
864         select VIRTUALIZATION
865         select VIRTIO
866         select VIRTIO_CONSOLE
867         help
868           Enabling this option adds support for virtio based paravirtual device
869           drivers on s390.
870 
871           Select this option if you want to run the kernel as a guest under
872           the KVM hypervisor.
873 
874 config S390_GUEST_OLD_TRANSPORT
875         def_bool y
876         prompt "Guest support for old s390 virtio transport (DEPRECATED)"
877         depends on S390_GUEST
878         help
879           Enable this option to add support for the old s390-virtio
880           transport (i.e. virtio devices NOT based on virtio-ccw). This
881           type of virtio devices is only available on the experimental
882           kuli userspace or with old (< 2.6) qemu. If you are running
883           with a modern version of qemu (which supports virtio-ccw since
884           1.4 and uses it by default since version 2.4), you probably won't
885           need this.
886 
887 endmenu

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