Version:  2.0.40 2.2.26 2.4.37 3.8 3.9 3.10 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

Linux/arch/s390/Kconfig

  1 config MMU
  2         def_bool y
  3 
  4 config ZONE_DMA
  5         def_bool y
  6 
  7 config LOCKDEP_SUPPORT
  8         def_bool y
  9 
 10 config STACKTRACE_SUPPORT
 11         def_bool y
 12 
 13 config HAVE_LATENCYTOP_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 S390
 66         def_bool y
 67         select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
 68         select ARCH_HAS_DEBUG_STRICT_USER_COPY_CHECKS
 69         select ARCH_HAS_ELF_RANDOMIZE
 70         select ARCH_HAS_GCOV_PROFILE_ALL
 71         select ARCH_HAS_SG_CHAIN
 72         select ARCH_HAVE_NMI_SAFE_CMPXCHG
 73         select ARCH_INLINE_READ_LOCK
 74         select ARCH_INLINE_READ_LOCK_BH
 75         select ARCH_INLINE_READ_LOCK_IRQ
 76         select ARCH_INLINE_READ_LOCK_IRQSAVE
 77         select ARCH_INLINE_READ_TRYLOCK
 78         select ARCH_INLINE_READ_UNLOCK
 79         select ARCH_INLINE_READ_UNLOCK_BH
 80         select ARCH_INLINE_READ_UNLOCK_IRQ
 81         select ARCH_INLINE_READ_UNLOCK_IRQRESTORE
 82         select ARCH_INLINE_SPIN_LOCK
 83         select ARCH_INLINE_SPIN_LOCK_BH
 84         select ARCH_INLINE_SPIN_LOCK_IRQ
 85         select ARCH_INLINE_SPIN_LOCK_IRQSAVE
 86         select ARCH_INLINE_SPIN_TRYLOCK
 87         select ARCH_INLINE_SPIN_TRYLOCK_BH
 88         select ARCH_INLINE_SPIN_UNLOCK
 89         select ARCH_INLINE_SPIN_UNLOCK_BH
 90         select ARCH_INLINE_SPIN_UNLOCK_IRQ
 91         select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE
 92         select ARCH_INLINE_WRITE_LOCK
 93         select ARCH_INLINE_WRITE_LOCK_BH
 94         select ARCH_INLINE_WRITE_LOCK_IRQ
 95         select ARCH_INLINE_WRITE_LOCK_IRQSAVE
 96         select ARCH_INLINE_WRITE_TRYLOCK
 97         select ARCH_INLINE_WRITE_UNLOCK
 98         select ARCH_INLINE_WRITE_UNLOCK_BH
 99         select ARCH_INLINE_WRITE_UNLOCK_IRQ
100         select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE
101         select ARCH_SAVE_PAGE_KEYS if HIBERNATION
102         select ARCH_SUPPORTS_ATOMIC_RMW
103         select ARCH_SUPPORTS_NUMA_BALANCING
104         select ARCH_USE_BUILTIN_BSWAP
105         select ARCH_USE_CMPXCHG_LOCKREF
106         select ARCH_WANTS_PROT_NUMA_PROT_NONE
107         select ARCH_WANT_IPC_PARSE_VERSION
108         select BUILDTIME_EXTABLE_SORT
109         select CLONE_BACKWARDS2
110         select DYNAMIC_FTRACE if FUNCTION_TRACER
111         select GENERIC_CLOCKEVENTS
112         select GENERIC_CPU_AUTOPROBE
113         select GENERIC_CPU_DEVICES if !SMP
114         select GENERIC_FIND_FIRST_BIT
115         select GENERIC_SMP_IDLE_THREAD
116         select GENERIC_TIME_VSYSCALL
117         select HAVE_ALIGNED_STRUCT_PAGE if SLUB
118         select HAVE_ARCH_AUDITSYSCALL
119         select HAVE_ARCH_EARLY_PFN_TO_NID
120         select HAVE_ARCH_JUMP_LABEL
121         select HAVE_ARCH_SECCOMP_FILTER
122         select HAVE_ARCH_SOFT_DIRTY
123         select HAVE_ARCH_TRACEHOOK
124         select HAVE_ARCH_TRANSPARENT_HUGEPAGE
125         select HAVE_BPF_JIT if PACK_STACK && HAVE_MARCH_Z196_FEATURES
126         select HAVE_CMPXCHG_DOUBLE
127         select HAVE_CMPXCHG_LOCAL
128         select HAVE_DEBUG_KMEMLEAK
129         select HAVE_DYNAMIC_FTRACE
130         select HAVE_DYNAMIC_FTRACE_WITH_REGS
131         select HAVE_FTRACE_MCOUNT_RECORD
132         select HAVE_FUNCTION_GRAPH_TRACER
133         select HAVE_FUNCTION_TRACER
134         select HAVE_FUTEX_CMPXCHG if FUTEX
135         select HAVE_KERNEL_BZIP2
136         select HAVE_KERNEL_GZIP
137         select HAVE_KERNEL_LZ4
138         select HAVE_KERNEL_LZMA
139         select HAVE_KERNEL_LZO
140         select HAVE_KERNEL_XZ
141         select HAVE_KPROBES
142         select HAVE_KRETPROBES
143         select HAVE_KVM
144         select HAVE_LIVEPATCH
145         select HAVE_MEMBLOCK
146         select HAVE_MEMBLOCK_NODE_MAP
147         select HAVE_MEMBLOCK_PHYS_MAP
148         select HAVE_MOD_ARCH_SPECIFIC
149         select HAVE_OPROFILE
150         select HAVE_PERF_EVENTS
151         select HAVE_REGS_AND_STACK_ACCESS_API
152         select HAVE_SYSCALL_TRACEPOINTS
153         select HAVE_VIRT_CPU_ACCOUNTING
154         select MODULES_USE_ELF_RELA
155         select NO_BOOTMEM
156         select OLD_SIGACTION
157         select OLD_SIGSUSPEND3
158         select SYSCTL_EXCEPTION_TRACE
159         select TTY
160         select VIRT_CPU_ACCOUNTING
161         select VIRT_TO_BUS
162 
163 
164 config SCHED_OMIT_FRAME_POINTER
165         def_bool y
166 
167 config PGTABLE_LEVELS
168         int
169         default 4 if 64BIT
170         default 2
171 
172 source "init/Kconfig"
173 
174 source "kernel/Kconfig.freezer"
175 
176 source "kernel/livepatch/Kconfig"
177 
178 menu "Processor type and features"
179 
180 config HAVE_MARCH_Z900_FEATURES
181         def_bool n
182 
183 config HAVE_MARCH_Z990_FEATURES
184         def_bool n
185         select HAVE_MARCH_Z900_FEATURES
186 
187 config HAVE_MARCH_Z9_109_FEATURES
188         def_bool n
189         select HAVE_MARCH_Z990_FEATURES
190 
191 config HAVE_MARCH_Z10_FEATURES
192         def_bool n
193         select HAVE_MARCH_Z9_109_FEATURES
194 
195 config HAVE_MARCH_Z196_FEATURES
196         def_bool n
197         select HAVE_MARCH_Z10_FEATURES
198 
199 config HAVE_MARCH_ZEC12_FEATURES
200         def_bool n
201         select HAVE_MARCH_Z196_FEATURES
202 
203 config HAVE_MARCH_Z13_FEATURES
204         def_bool n
205         select HAVE_MARCH_ZEC12_FEATURES
206 
207 choice
208         prompt "Processor type"
209         default MARCH_Z900
210 
211 config MARCH_Z900
212         bool "IBM zSeries model z800 and z900"
213         select HAVE_MARCH_Z900_FEATURES
214         help
215           Select this to enable optimizations for model z800/z900 (2064 and
216           2066 series). This will enable some optimizations that are not
217           available on older ESA/390 (31 Bit) only CPUs.
218 
219 config MARCH_Z990
220         bool "IBM zSeries model z890 and z990"
221         select HAVE_MARCH_Z990_FEATURES
222         help
223           Select this to enable optimizations for model z890/z990 (2084 and
224           2086 series). The kernel will be slightly faster but will not work
225           on older machines.
226 
227 config MARCH_Z9_109
228         bool "IBM System z9"
229         select HAVE_MARCH_Z9_109_FEATURES
230         help
231           Select this to enable optimizations for IBM System z9 (2094 and
232           2096 series). The kernel will be slightly faster but will not work
233           on older machines.
234 
235 config MARCH_Z10
236         bool "IBM System z10"
237         select HAVE_MARCH_Z10_FEATURES
238         help
239           Select this to enable optimizations for IBM System z10 (2097 and
240           2098 series). The kernel will be slightly faster but will not work
241           on older machines.
242 
243 config MARCH_Z196
244         bool "IBM zEnterprise 114 and 196"
245         select HAVE_MARCH_Z196_FEATURES
246         help
247           Select this to enable optimizations for IBM zEnterprise 114 and 196
248           (2818 and 2817 series). The kernel will be slightly faster but will
249           not work on older machines.
250 
251 config MARCH_ZEC12
252         bool "IBM zBC12 and zEC12"
253         select HAVE_MARCH_ZEC12_FEATURES
254         help
255           Select this to enable optimizations for IBM zBC12 and zEC12 (2828 and
256           2827 series). The kernel will be slightly faster but will not work on
257           older machines.
258 
259 config MARCH_Z13
260         bool "IBM z13"
261         select HAVE_MARCH_Z13_FEATURES
262         help
263           Select this to enable optimizations for IBM z13 (2964 series).
264           The kernel will be slightly faster but will not work on older
265           machines.
266 
267 endchoice
268 
269 config MARCH_Z900_TUNE
270         def_bool TUNE_Z900 || MARCH_Z900 && TUNE_DEFAULT
271 
272 config MARCH_Z990_TUNE
273         def_bool TUNE_Z990 || MARCH_Z990 && TUNE_DEFAULT
274 
275 config MARCH_Z9_109_TUNE
276         def_bool TUNE_Z9_109 || MARCH_Z9_109 && TUNE_DEFAULT
277 
278 config MARCH_Z10_TUNE
279         def_bool TUNE_Z10 || MARCH_Z10 && TUNE_DEFAULT
280 
281 config MARCH_Z196_TUNE
282         def_bool TUNE_Z196 || MARCH_Z196 && TUNE_DEFAULT
283 
284 config MARCH_ZEC12_TUNE
285         def_bool TUNE_ZEC12 || MARCH_ZEC12 && TUNE_DEFAULT
286 
287 config MARCH_Z13_TUNE
288         def_bool TUNE_Z13 || MARCH_Z13 && TUNE_DEFAULT
289 
290 choice
291         prompt "Tune code generation"
292         default TUNE_DEFAULT
293         help
294           Cause the compiler to tune (-mtune) the generated code for a machine.
295           This will make the code run faster on the selected machine but
296           somewhat slower on other machines.
297           This option only changes how the compiler emits instructions, not the
298           selection of instructions itself, so the resulting kernel will run on
299           all other machines.
300 
301 config TUNE_DEFAULT
302         bool "Default"
303         help
304           Tune the generated code for the target processor for which the kernel
305           will be compiled.
306 
307 config TUNE_Z900
308         bool "IBM zSeries model z800 and z900"
309 
310 config TUNE_Z990
311         bool "IBM zSeries model z890 and z990"
312 
313 config TUNE_Z9_109
314         bool "IBM System z9"
315 
316 config TUNE_Z10
317         bool "IBM System z10"
318 
319 config TUNE_Z196
320         bool "IBM zEnterprise 114 and 196"
321 
322 config TUNE_ZEC12
323         bool "IBM zBC12 and zEC12"
324 
325 config TUNE_Z13
326         bool "IBM z13"
327 
328 endchoice
329 
330 config 64BIT
331         def_bool y
332 
333 config COMPAT
334         def_bool y
335         prompt "Kernel support for 31 bit emulation"
336         select COMPAT_BINFMT_ELF if BINFMT_ELF
337         select ARCH_WANT_OLD_COMPAT_IPC
338         select COMPAT_OLD_SIGACTION
339         depends on MULTIUSER
340         help
341           Select this option if you want to enable your system kernel to
342           handle system-calls from ELF binaries for 31 bit ESA.  This option
343           (and some other stuff like libraries and such) is needed for
344           executing 31 bit applications.  It is safe to say "Y".
345 
346 config SYSVIPC_COMPAT
347         def_bool y if COMPAT && SYSVIPC
348 
349 config KEYS_COMPAT
350         def_bool y if COMPAT && KEYS
351 
352 config SMP
353         def_bool y
354         prompt "Symmetric multi-processing support"
355         ---help---
356           This enables support for systems with more than one CPU. If you have
357           a system with only one CPU, like most personal computers, say N. If
358           you have a system with more than one CPU, say Y.
359 
360           If you say N here, the kernel will run on uni- and multiprocessor
361           machines, but will use only one CPU of a multiprocessor machine. If
362           you say Y here, the kernel will run on many, but not all,
363           uniprocessor machines. On a uniprocessor machine, the kernel
364           will run faster if you say N here.
365 
366           See also the SMP-HOWTO available at
367           <http://www.tldp.org/docs.html#howto>.
368 
369           Even if you don't know what to do here, say Y.
370 
371 config NR_CPUS
372         int "Maximum number of CPUs (2-512)"
373         range 2 512
374         depends on SMP
375         default "64"
376         help
377           This allows you to specify the maximum number of CPUs which this
378           kernel will support. The maximum supported value is 512 and the
379           minimum value which makes sense is 2.
380 
381           This is purely to save memory - each supported CPU adds
382           approximately sixteen kilobytes to the kernel image.
383 
384 config HOTPLUG_CPU
385         def_bool y
386         prompt "Support for hot-pluggable CPUs"
387         depends on SMP
388         help
389           Say Y here to be able to turn CPUs off and on. CPUs
390           can be controlled through /sys/devices/system/cpu/cpu#.
391           Say N if you want to disable CPU hotplug.
392 
393 config SCHED_SMT
394         def_bool n
395 
396 # Some NUMA nodes have memory ranges that span
397 # other nodes.  Even though a pfn is valid and
398 # between a node's start and end pfns, it may not
399 # reside on that node.  See memmap_init_zone()
400 # for details. <- They meant memory holes!
401 config NODES_SPAN_OTHER_NODES
402         def_bool NUMA
403 
404 config NUMA
405         bool "NUMA support"
406         depends on SMP && 64BIT && SCHED_TOPOLOGY
407         default n
408         help
409           Enable NUMA support
410 
411           This option adds NUMA support to the kernel.
412 
413           An operation mode can be selected by appending
414           numa=<method> to the kernel command line.
415 
416           The default behaviour is identical to appending numa=plain to
417           the command line. This will create just one node with all
418           available memory and all CPUs in it.
419 
420 config NODES_SHIFT
421         int "Maximum NUMA nodes (as a power of 2)"
422         range 1 10
423         depends on NUMA
424         default "4"
425         help
426           Specify the maximum number of NUMA nodes available on the target
427           system. Increases memory reserved to accommodate various tables.
428 
429 menu "Select NUMA modes"
430         depends on NUMA
431 
432 config NUMA_EMU
433         bool "NUMA emulation"
434         default y
435         help
436           Numa emulation mode will split the available system memory into
437           equal chunks which then are distributed over the configured number
438           of nodes in a round-robin manner.
439 
440           The number of fake nodes is limited by the number of available memory
441           chunks (i.e. memory size / fake size) and the number of supported
442           nodes in the kernel.
443 
444           The CPUs are assigned to the nodes in a way that partially respects
445           the original machine topology (if supported by the machine).
446           Fair distribution of the CPUs is not guaranteed.
447 
448 config EMU_SIZE
449         hex "NUMA emulation memory chunk size"
450         default 0x10000000
451         range 0x400000 0x100000000
452         depends on NUMA_EMU
453         help
454           Select the default size by which the memory is chopped and then
455           assigned to emulated NUMA nodes.
456 
457           This can be overridden by specifying
458 
459           emu_size=<n>
460 
461           on the kernel command line where also suffixes K, M, G, and T are
462           supported.
463 
464 endmenu
465 
466 config SCHED_MC
467         def_bool n
468 
469 config SCHED_BOOK
470         def_bool n
471 
472 config SCHED_TOPOLOGY
473         def_bool y
474         prompt "Topology scheduler support"
475         depends on SMP
476         select SCHED_SMT
477         select SCHED_MC
478         select SCHED_BOOK
479         help
480           Topology scheduler support improves the CPU scheduler's decision
481           making when dealing with machines that have multi-threading,
482           multiple cores or multiple books.
483 
484 source kernel/Kconfig.preempt
485 
486 source kernel/Kconfig.hz
487 
488 endmenu
489 
490 menu "Memory setup"
491 
492 config ARCH_SPARSEMEM_ENABLE
493         def_bool y
494         select SPARSEMEM_VMEMMAP_ENABLE
495         select SPARSEMEM_VMEMMAP
496 
497 config ARCH_SPARSEMEM_DEFAULT
498         def_bool y
499 
500 config ARCH_SELECT_MEMORY_MODEL
501         def_bool y
502 
503 config ARCH_ENABLE_MEMORY_HOTPLUG
504         def_bool y if SPARSEMEM
505 
506 config ARCH_ENABLE_MEMORY_HOTREMOVE
507         def_bool y
508 
509 config ARCH_ENABLE_SPLIT_PMD_PTLOCK
510         def_bool y
511 
512 config FORCE_MAX_ZONEORDER
513         int
514         default "9"
515 
516 source "mm/Kconfig"
517 
518 config PACK_STACK
519         def_bool y
520         prompt "Pack kernel stack"
521         help
522           This option enables the compiler option -mkernel-backchain if it
523           is available. If the option is available the compiler supports
524           the new stack layout which dramatically reduces the minimum stack
525           frame size. With an old compiler a non-leaf function needs a
526           minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
527           -mkernel-backchain the minimum size drops to 16 byte on 31 bit
528           and 24 byte on 64 bit.
529 
530           Say Y if you are unsure.
531 
532 config CHECK_STACK
533         def_bool y
534         prompt "Detect kernel stack overflow"
535         help
536           This option enables the compiler option -mstack-guard and
537           -mstack-size if they are available. If the compiler supports them
538           it will emit additional code to each function prolog to trigger
539           an illegal operation if the kernel stack is about to overflow.
540 
541           Say N if you are unsure.
542 
543 config STACK_GUARD
544         int "Size of the guard area (128-1024)"
545         range 128 1024
546         depends on CHECK_STACK
547         default "256"
548         help
549           This allows you to specify the size of the guard area at the lower
550           end of the kernel stack. If the kernel stack points into the guard
551           area on function entry an illegal operation is triggered. The size
552           needs to be a power of 2. Please keep in mind that the size of an
553           interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
554           The minimum size for the stack guard should be 256 for 31 bit and
555           512 for 64 bit.
556 
557 config WARN_DYNAMIC_STACK
558         def_bool n
559         prompt "Emit compiler warnings for function with dynamic stack usage"
560         help
561           This option enables the compiler option -mwarn-dynamicstack. If the
562           compiler supports this options generates warnings for functions
563           that dynamically allocate stack space using alloca.
564 
565           Say N if you are unsure.
566 
567 endmenu
568 
569 menu "I/O subsystem"
570 
571 config QDIO
572         def_tristate y
573         prompt "QDIO support"
574         ---help---
575           This driver provides the Queued Direct I/O base support for
576           IBM System z.
577 
578           To compile this driver as a module, choose M here: the
579           module will be called qdio.
580 
581           If unsure, say Y.
582 
583 menuconfig PCI
584         bool "PCI support"
585         select HAVE_DMA_ATTRS
586         select PCI_MSI
587         select IOMMU_SUPPORT
588         help
589           Enable PCI support.
590 
591 if PCI
592 
593 config PCI_NR_FUNCTIONS
594         int "Maximum number of PCI functions (1-4096)"
595         range 1 4096
596         default "64"
597         help
598           This allows you to specify the maximum number of PCI functions which
599           this kernel will support.
600 
601 config PCI_NR_MSI
602         int "Maximum number of MSI interrupts (64-32768)"
603         range 64 32768
604         default "256"
605         help
606           This defines the number of virtual interrupts the kernel will
607           provide for MSI interrupts. If you configure your system to have
608           too few drivers will fail to allocate MSI interrupts for all
609           PCI devices.
610 
611 source "drivers/pci/Kconfig"
612 source "drivers/pci/pcie/Kconfig"
613 source "drivers/pci/hotplug/Kconfig"
614 
615 endif   # PCI
616 
617 config PCI_DOMAINS
618         def_bool PCI
619 
620 config HAS_IOMEM
621         def_bool PCI
622 
623 config IOMMU_HELPER
624         def_bool PCI
625 
626 config HAS_DMA
627         def_bool PCI
628         select HAVE_DMA_API_DEBUG
629 
630 config NEED_SG_DMA_LENGTH
631         def_bool PCI
632 
633 config NEED_DMA_MAP_STATE
634         def_bool PCI
635 
636 config CHSC_SCH
637         def_tristate m
638         prompt "Support for CHSC subchannels"
639         help
640           This driver allows usage of CHSC subchannels. A CHSC subchannel
641           is usually present on LPAR only.
642           The driver creates a device /dev/chsc, which may be used to
643           obtain I/O configuration information about the machine and
644           to issue asynchronous chsc commands (DANGEROUS).
645           You will usually only want to use this interface on a special
646           LPAR designated for system management.
647 
648           To compile this driver as a module, choose M here: the
649           module will be called chsc_sch.
650 
651           If unsure, say N.
652 
653 config SCM_BUS
654         def_bool y
655         prompt "SCM bus driver"
656         help
657           Bus driver for Storage Class Memory.
658 
659 config EADM_SCH
660         def_tristate m
661         prompt "Support for EADM subchannels"
662         depends on SCM_BUS
663         help
664           This driver allows usage of EADM subchannels. EADM subchannels act
665           as a communication vehicle for SCM increments.
666 
667           To compile this driver as a module, choose M here: the
668           module will be called eadm_sch.
669 
670 endmenu
671 
672 menu "Dump support"
673 
674 config CRASH_DUMP
675         bool "kernel crash dumps"
676         depends on SMP
677         select KEXEC
678         help
679           Generate crash dump after being started by kexec.
680           Crash dump kernels are loaded in the main kernel with kexec-tools
681           into a specially reserved region and then later executed after
682           a crash by kdump/kexec.
683           Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this.
684           This option also enables s390 zfcpdump.
685           See also <file:Documentation/s390/zfcpdump.txt>
686 
687 endmenu
688 
689 menu "Executable file formats / Emulations"
690 
691 source "fs/Kconfig.binfmt"
692 
693 config SECCOMP
694         def_bool y
695         prompt "Enable seccomp to safely compute untrusted bytecode"
696         depends on PROC_FS
697         help
698           This kernel feature is useful for number crunching applications
699           that may need to compute untrusted bytecode during their
700           execution. By using pipes or other transports made available to
701           the process as file descriptors supporting the read/write
702           syscalls, it's possible to isolate those applications in
703           their own address space using seccomp. Once seccomp is
704           enabled via /proc/<pid>/seccomp, it cannot be disabled
705           and the task is only allowed to execute a few safe syscalls
706           defined by each seccomp mode.
707 
708           If unsure, say Y.
709 
710 endmenu
711 
712 menu "Power Management"
713 
714 config ARCH_HIBERNATION_POSSIBLE
715         def_bool y
716 
717 source "kernel/power/Kconfig"
718 
719 endmenu
720 
721 source "net/Kconfig"
722 
723 config PCMCIA
724         def_bool n
725 
726 config CCW
727         def_bool y
728 
729 source "drivers/Kconfig"
730 
731 source "fs/Kconfig"
732 
733 source "arch/s390/Kconfig.debug"
734 
735 source "security/Kconfig"
736 
737 source "crypto/Kconfig"
738 
739 source "lib/Kconfig"
740 
741 menu "Virtualization"
742 
743 config PFAULT
744         def_bool y
745         prompt "Pseudo page fault support"
746         help
747           Select this option, if you want to use PFAULT pseudo page fault
748           handling under VM. If running native or in LPAR, this option
749           has no effect. If your VM does not support PFAULT, PAGEEX
750           pseudo page fault handling will be used.
751           Note that VM 4.2 supports PFAULT but has a bug in its
752           implementation that causes some problems.
753           Everybody who wants to run Linux under VM != VM4.2 should select
754           this option.
755 
756 config SHARED_KERNEL
757         bool "VM shared kernel support"
758         depends on !JUMP_LABEL
759         help
760           Select this option, if you want to share the text segment of the
761           Linux kernel between different VM guests. This reduces memory
762           usage with lots of guests but greatly increases kernel size.
763           Also if a kernel was IPL'ed from a shared segment the kexec system
764           call will not work.
765           You should only select this option if you know what you are
766           doing and want to exploit this feature.
767 
768 config CMM
769         def_tristate n
770         prompt "Cooperative memory management"
771         help
772           Select this option, if you want to enable the kernel interface
773           to reduce the memory size of the system. This is accomplished
774           by allocating pages of memory and put them "on hold". This only
775           makes sense for a system running under VM where the unused pages
776           will be reused by VM for other guest systems. The interface
777           allows an external monitor to balance memory of many systems.
778           Everybody who wants to run Linux under VM should select this
779           option.
780 
781 config CMM_IUCV
782         def_bool y
783         prompt "IUCV special message interface to cooperative memory management"
784         depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
785         help
786           Select this option to enable the special message interface to
787           the cooperative memory management.
788 
789 config APPLDATA_BASE
790         def_bool n
791         prompt "Linux - VM Monitor Stream, base infrastructure"
792         depends on PROC_FS
793         help
794           This provides a kernel interface for creating and updating z/VM APPLDATA
795           monitor records. The monitor records are updated at certain time
796           intervals, once the timer is started.
797           Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
798           i.e. enables or disables monitoring on the Linux side.
799           A custom interval value (in seconds) can be written to
800           /proc/appldata/interval.
801 
802           Defaults are 60 seconds interval and timer off.
803           The /proc entries can also be read from, showing the current settings.
804 
805 config APPLDATA_MEM
806         def_tristate m
807         prompt "Monitor memory management statistics"
808         depends on APPLDATA_BASE && VM_EVENT_COUNTERS
809         help
810           This provides memory management related data to the Linux - VM Monitor
811           Stream, like paging/swapping rate, memory utilisation, etc.
812           Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
813           APPLDATA monitor record, i.e. enables or disables monitoring this record
814           on the z/VM side.
815 
816           Default is disabled.
817           The /proc entry can also be read from, showing the current settings.
818 
819           This can also be compiled as a module, which will be called
820           appldata_mem.o.
821 
822 config APPLDATA_OS
823         def_tristate m
824         prompt "Monitor OS statistics"
825         depends on APPLDATA_BASE
826         help
827           This provides OS related data to the Linux - VM Monitor Stream, like
828           CPU utilisation, etc.
829           Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
830           APPLDATA monitor record, i.e. enables or disables monitoring this record
831           on the z/VM side.
832 
833           Default is disabled.
834           This can also be compiled as a module, which will be called
835           appldata_os.o.
836 
837 config APPLDATA_NET_SUM
838         def_tristate m
839         prompt "Monitor overall network statistics"
840         depends on APPLDATA_BASE && NET
841         help
842           This provides network related data to the Linux - VM Monitor Stream,
843           currently there is only a total sum of network I/O statistics, no
844           per-interface data.
845           Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
846           APPLDATA monitor record, i.e. enables or disables monitoring this record
847           on the z/VM side.
848 
849           Default is disabled.
850           This can also be compiled as a module, which will be called
851           appldata_net_sum.o.
852 
853 config S390_HYPFS_FS
854         def_bool y
855         prompt "s390 hypervisor file system support"
856         select SYS_HYPERVISOR
857         help
858           This is a virtual file system intended to provide accounting
859           information in an s390 hypervisor environment.
860 
861 source "arch/s390/kvm/Kconfig"
862 
863 config S390_GUEST
864         def_bool y
865         prompt "s390 support for virtio devices"
866         select TTY
867         select VIRTUALIZATION
868         select VIRTIO
869         select VIRTIO_CONSOLE
870         help
871           Enabling this option adds support for virtio based paravirtual device
872           drivers on s390.
873 
874           Select this option if you want to run the kernel as a guest under
875           the KVM hypervisor.
876 
877 endmenu

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