Version:  2.0.40 2.2.26 2.4.37 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 4.5 4.6

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_DEBUG_STRICT_USER_COPY_CHECKS
 72         select ARCH_HAS_DEVMEM_IS_ALLOWED
 73         select ARCH_HAS_ELF_RANDOMIZE
 74         select ARCH_HAS_GCOV_PROFILE_ALL
 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_PROT_NUMA_PROT_NONE
111         select ARCH_WANT_IPC_PARSE_VERSION
112         select BUILDTIME_EXTABLE_SORT
113         select CLONE_BACKWARDS2
114         select DYNAMIC_FTRACE if FUNCTION_TRACER
115         select GENERIC_CLOCKEVENTS
116         select GENERIC_CPU_AUTOPROBE
117         select GENERIC_CPU_DEVICES if !SMP
118         select GENERIC_FIND_FIRST_BIT
119         select GENERIC_SMP_IDLE_THREAD
120         select GENERIC_TIME_VSYSCALL
121         select HAVE_ALIGNED_STRUCT_PAGE if SLUB
122         select HAVE_ARCH_AUDITSYSCALL
123         select HAVE_ARCH_EARLY_PFN_TO_NID
124         select HAVE_ARCH_JUMP_LABEL
125         select HAVE_ARCH_SECCOMP_FILTER
126         select HAVE_ARCH_SOFT_DIRTY
127         select HAVE_ARCH_TRACEHOOK
128         select HAVE_ARCH_TRANSPARENT_HUGEPAGE
129         select HAVE_BPF_JIT if PACK_STACK && HAVE_MARCH_Z196_FEATURES
130         select HAVE_CMPXCHG_DOUBLE
131         select HAVE_CMPXCHG_LOCAL
132         select HAVE_DEBUG_KMEMLEAK
133         select HAVE_DMA_API_DEBUG
134         select HAVE_DYNAMIC_FTRACE
135         select HAVE_DYNAMIC_FTRACE_WITH_REGS
136         select HAVE_FTRACE_MCOUNT_RECORD
137         select HAVE_FUNCTION_GRAPH_TRACER
138         select HAVE_FUNCTION_TRACER
139         select HAVE_FUTEX_CMPXCHG if FUTEX
140         select HAVE_KERNEL_BZIP2
141         select HAVE_KERNEL_GZIP
142         select HAVE_KERNEL_LZ4
143         select HAVE_KERNEL_LZMA
144         select HAVE_KERNEL_LZO
145         select HAVE_KERNEL_XZ
146         select HAVE_KPROBES
147         select HAVE_KRETPROBES
148         select HAVE_KVM
149         select HAVE_LIVEPATCH
150         select HAVE_MEMBLOCK
151         select HAVE_MEMBLOCK_NODE_MAP
152         select HAVE_MEMBLOCK_PHYS_MAP
153         select HAVE_MOD_ARCH_SPECIFIC
154         select HAVE_OPROFILE
155         select HAVE_PERF_EVENTS
156         select HAVE_REGS_AND_STACK_ACCESS_API
157         select HAVE_SYSCALL_TRACEPOINTS
158         select HAVE_VIRT_CPU_ACCOUNTING
159         select MODULES_USE_ELF_RELA
160         select NO_BOOTMEM
161         select OLD_SIGACTION
162         select OLD_SIGSUSPEND3
163         select SYSCTL_EXCEPTION_TRACE
164         select TTY
165         select VIRT_CPU_ACCOUNTING
166         select VIRT_TO_BUS
167 
168 
169 config SCHED_OMIT_FRAME_POINTER
170         def_bool y
171 
172 config PGTABLE_LEVELS
173         int
174         default 4
175 
176 source "init/Kconfig"
177 
178 source "kernel/Kconfig.freezer"
179 
180 source "kernel/livepatch/Kconfig"
181 
182 menu "Processor type and features"
183 
184 config HAVE_MARCH_Z900_FEATURES
185         def_bool n
186 
187 config HAVE_MARCH_Z990_FEATURES
188         def_bool n
189         select HAVE_MARCH_Z900_FEATURES
190 
191 config HAVE_MARCH_Z9_109_FEATURES
192         def_bool n
193         select HAVE_MARCH_Z990_FEATURES
194 
195 config HAVE_MARCH_Z10_FEATURES
196         def_bool n
197         select HAVE_MARCH_Z9_109_FEATURES
198 
199 config HAVE_MARCH_Z196_FEATURES
200         def_bool n
201         select HAVE_MARCH_Z10_FEATURES
202 
203 config HAVE_MARCH_ZEC12_FEATURES
204         def_bool n
205         select HAVE_MARCH_Z196_FEATURES
206 
207 config HAVE_MARCH_Z13_FEATURES
208         def_bool n
209         select HAVE_MARCH_ZEC12_FEATURES
210 
211 choice
212         prompt "Processor type"
213         default MARCH_Z900
214 
215 config MARCH_Z900
216         bool "IBM zSeries model z800 and z900"
217         select HAVE_MARCH_Z900_FEATURES
218         help
219           Select this to enable optimizations for model z800/z900 (2064 and
220           2066 series). This will enable some optimizations that are not
221           available on older ESA/390 (31 Bit) only CPUs.
222 
223 config MARCH_Z990
224         bool "IBM zSeries model z890 and z990"
225         select HAVE_MARCH_Z990_FEATURES
226         help
227           Select this to enable optimizations for model z890/z990 (2084 and
228           2086 series). The kernel will be slightly faster but will not work
229           on older machines.
230 
231 config MARCH_Z9_109
232         bool "IBM System z9"
233         select HAVE_MARCH_Z9_109_FEATURES
234         help
235           Select this to enable optimizations for IBM System z9 (2094 and
236           2096 series). The kernel will be slightly faster but will not work
237           on older machines.
238 
239 config MARCH_Z10
240         bool "IBM System z10"
241         select HAVE_MARCH_Z10_FEATURES
242         help
243           Select this to enable optimizations for IBM System z10 (2097 and
244           2098 series). The kernel will be slightly faster but will not work
245           on older machines.
246 
247 config MARCH_Z196
248         bool "IBM zEnterprise 114 and 196"
249         select HAVE_MARCH_Z196_FEATURES
250         help
251           Select this to enable optimizations for IBM zEnterprise 114 and 196
252           (2818 and 2817 series). The kernel will be slightly faster but will
253           not work on older machines.
254 
255 config MARCH_ZEC12
256         bool "IBM zBC12 and zEC12"
257         select HAVE_MARCH_ZEC12_FEATURES
258         help
259           Select this to enable optimizations for IBM zBC12 and zEC12 (2828 and
260           2827 series). The kernel will be slightly faster but will not work on
261           older machines.
262 
263 config MARCH_Z13
264         bool "IBM z13s and z13"
265         select HAVE_MARCH_Z13_FEATURES
266         help
267           Select this to enable optimizations for IBM z13s and z13 (2965 and
268           2964 series). The kernel will be slightly faster but will not work on
269           older machines.
270 
271 endchoice
272 
273 config MARCH_Z900_TUNE
274         def_bool TUNE_Z900 || MARCH_Z900 && TUNE_DEFAULT
275 
276 config MARCH_Z990_TUNE
277         def_bool TUNE_Z990 || MARCH_Z990 && TUNE_DEFAULT
278 
279 config MARCH_Z9_109_TUNE
280         def_bool TUNE_Z9_109 || MARCH_Z9_109 && TUNE_DEFAULT
281 
282 config MARCH_Z10_TUNE
283         def_bool TUNE_Z10 || MARCH_Z10 && TUNE_DEFAULT
284 
285 config MARCH_Z196_TUNE
286         def_bool TUNE_Z196 || MARCH_Z196 && TUNE_DEFAULT
287 
288 config MARCH_ZEC12_TUNE
289         def_bool TUNE_ZEC12 || MARCH_ZEC12 && TUNE_DEFAULT
290 
291 config MARCH_Z13_TUNE
292         def_bool TUNE_Z13 || MARCH_Z13 && TUNE_DEFAULT
293 
294 choice
295         prompt "Tune code generation"
296         default TUNE_DEFAULT
297         help
298           Cause the compiler to tune (-mtune) the generated code for a machine.
299           This will make the code run faster on the selected machine but
300           somewhat slower on other machines.
301           This option only changes how the compiler emits instructions, not the
302           selection of instructions itself, so the resulting kernel will run on
303           all other machines.
304 
305 config TUNE_DEFAULT
306         bool "Default"
307         help
308           Tune the generated code for the target processor for which the kernel
309           will be compiled.
310 
311 config TUNE_Z900
312         bool "IBM zSeries model z800 and z900"
313 
314 config TUNE_Z990
315         bool "IBM zSeries model z890 and z990"
316 
317 config TUNE_Z9_109
318         bool "IBM System z9"
319 
320 config TUNE_Z10
321         bool "IBM System z10"
322 
323 config TUNE_Z196
324         bool "IBM zEnterprise 114 and 196"
325 
326 config TUNE_ZEC12
327         bool "IBM zBC12 and zEC12"
328 
329 config TUNE_Z13
330         bool "IBM z13"
331 
332 endchoice
333 
334 config 64BIT
335         def_bool y
336 
337 config COMPAT
338         def_bool y
339         prompt "Kernel support for 31 bit emulation"
340         select COMPAT_BINFMT_ELF if BINFMT_ELF
341         select ARCH_WANT_OLD_COMPAT_IPC
342         select COMPAT_OLD_SIGACTION
343         depends on MULTIUSER
344         help
345           Select this option if you want to enable your system kernel to
346           handle system-calls from ELF binaries for 31 bit ESA.  This option
347           (and some other stuff like libraries and such) is needed for
348           executing 31 bit applications.  It is safe to say "Y".
349 
350 config SYSVIPC_COMPAT
351         def_bool y if COMPAT && SYSVIPC
352 
353 config KEYS_COMPAT
354         def_bool y if COMPAT && KEYS
355 
356 config SMP
357         def_bool y
358         prompt "Symmetric multi-processing support"
359         ---help---
360           This enables support for systems with more than one CPU. If you have
361           a system with only one CPU, like most personal computers, say N. If
362           you have a system with more than one CPU, say Y.
363 
364           If you say N here, the kernel will run on uni- and multiprocessor
365           machines, but will use only one CPU of a multiprocessor machine. If
366           you say Y here, the kernel will run on many, but not all,
367           uniprocessor machines. On a uniprocessor machine, the kernel
368           will run faster if you say N here.
369 
370           See also the SMP-HOWTO available at
371           <http://www.tldp.org/docs.html#howto>.
372 
373           Even if you don't know what to do here, say Y.
374 
375 config NR_CPUS
376         int "Maximum number of CPUs (2-512)"
377         range 2 512
378         depends on SMP
379         default "64"
380         help
381           This allows you to specify the maximum number of CPUs which this
382           kernel will support. The maximum supported value is 512 and the
383           minimum value which makes sense is 2.
384 
385           This is purely to save memory - each supported CPU adds
386           approximately sixteen kilobytes to the kernel image.
387 
388 config HOTPLUG_CPU
389         def_bool y
390         prompt "Support for hot-pluggable CPUs"
391         depends on SMP
392         help
393           Say Y here to be able to turn CPUs off and on. CPUs
394           can be controlled through /sys/devices/system/cpu/cpu#.
395           Say N if you want to disable CPU hotplug.
396 
397 # Some NUMA nodes have memory ranges that span
398 # other nodes.  Even though a pfn is valid and
399 # between a node's start and end pfns, it may not
400 # reside on that node.  See memmap_init_zone()
401 # for details. <- They meant memory holes!
402 config NODES_SPAN_OTHER_NODES
403         def_bool NUMA
404 
405 config NUMA
406         bool "NUMA support"
407         depends on SMP && SCHED_TOPOLOGY
408         default n
409         help
410           Enable NUMA support
411 
412           This option adds NUMA support to the kernel.
413 
414           An operation mode can be selected by appending
415           numa=<method> to the kernel command line.
416 
417           The default behaviour is identical to appending numa=plain to
418           the command line. This will create just one node with all
419           available memory and all CPUs in it.
420 
421 config NODES_SHIFT
422         int "Maximum NUMA nodes (as a power of 2)"
423         range 1 10
424         depends on NUMA
425         default "4"
426         help
427           Specify the maximum number of NUMA nodes available on the target
428           system. Increases memory reserved to accommodate various tables.
429 
430 menu "Select NUMA modes"
431         depends on NUMA
432 
433 config NUMA_EMU
434         bool "NUMA emulation"
435         default y
436         help
437           Numa emulation mode will split the available system memory into
438           equal chunks which then are distributed over the configured number
439           of nodes in a round-robin manner.
440 
441           The number of fake nodes is limited by the number of available memory
442           chunks (i.e. memory size / fake size) and the number of supported
443           nodes in the kernel.
444 
445           The CPUs are assigned to the nodes in a way that partially respects
446           the original machine topology (if supported by the machine).
447           Fair distribution of the CPUs is not guaranteed.
448 
449 config EMU_SIZE
450         hex "NUMA emulation memory chunk size"
451         default 0x10000000
452         range 0x400000 0x100000000
453         depends on NUMA_EMU
454         help
455           Select the default size by which the memory is chopped and then
456           assigned to emulated NUMA nodes.
457 
458           This can be overridden by specifying
459 
460           emu_size=<n>
461 
462           on the kernel command line where also suffixes K, M, G, and T are
463           supported.
464 
465 endmenu
466 
467 config SCHED_SMT
468         def_bool n
469 
470 config SCHED_MC
471         def_bool n
472 
473 config SCHED_BOOK
474         def_bool n
475 
476 config SCHED_TOPOLOGY
477         def_bool y
478         prompt "Topology scheduler support"
479         depends on SMP
480         select SCHED_SMT
481         select SCHED_MC
482         select SCHED_BOOK
483         help
484           Topology scheduler support improves the CPU scheduler's decision
485           making when dealing with machines that have multi-threading,
486           multiple cores or multiple books.
487 
488 source kernel/Kconfig.preempt
489 
490 source kernel/Kconfig.hz
491 
492 endmenu
493 
494 menu "Memory setup"
495 
496 config ARCH_SPARSEMEM_ENABLE
497         def_bool y
498         select SPARSEMEM_VMEMMAP_ENABLE
499         select SPARSEMEM_VMEMMAP
500 
501 config ARCH_SPARSEMEM_DEFAULT
502         def_bool y
503 
504 config ARCH_SELECT_MEMORY_MODEL
505         def_bool y
506 
507 config ARCH_ENABLE_MEMORY_HOTPLUG
508         def_bool y if SPARSEMEM
509 
510 config ARCH_ENABLE_MEMORY_HOTREMOVE
511         def_bool y
512 
513 config ARCH_ENABLE_SPLIT_PMD_PTLOCK
514         def_bool y
515 
516 config FORCE_MAX_ZONEORDER
517         int
518         default "9"
519 
520 source "mm/Kconfig"
521 
522 config PACK_STACK
523         def_bool y
524         prompt "Pack kernel stack"
525         help
526           This option enables the compiler option -mkernel-backchain if it
527           is available. If the option is available the compiler supports
528           the new stack layout which dramatically reduces the minimum stack
529           frame size. With an old compiler a non-leaf function needs a
530           minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
531           -mkernel-backchain the minimum size drops to 16 byte on 31 bit
532           and 24 byte on 64 bit.
533 
534           Say Y if you are unsure.
535 
536 config CHECK_STACK
537         def_bool y
538         prompt "Detect kernel stack overflow"
539         help
540           This option enables the compiler option -mstack-guard and
541           -mstack-size if they are available. If the compiler supports them
542           it will emit additional code to each function prolog to trigger
543           an illegal operation if the kernel stack is about to overflow.
544 
545           Say N if you are unsure.
546 
547 config STACK_GUARD
548         int "Size of the guard area (128-1024)"
549         range 128 1024
550         depends on CHECK_STACK
551         default "256"
552         help
553           This allows you to specify the size of the guard area at the lower
554           end of the kernel stack. If the kernel stack points into the guard
555           area on function entry an illegal operation is triggered. The size
556           needs to be a power of 2. Please keep in mind that the size of an
557           interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
558           The minimum size for the stack guard should be 256 for 31 bit and
559           512 for 64 bit.
560 
561 config WARN_DYNAMIC_STACK
562         def_bool n
563         prompt "Emit compiler warnings for function with dynamic stack usage"
564         help
565           This option enables the compiler option -mwarn-dynamicstack. If the
566           compiler supports this options generates warnings for functions
567           that dynamically allocate stack space using alloca.
568 
569           Say N if you are unsure.
570 
571 endmenu
572 
573 menu "I/O subsystem"
574 
575 config QDIO
576         def_tristate y
577         prompt "QDIO support"
578         ---help---
579           This driver provides the Queued Direct I/O base support for
580           IBM System z.
581 
582           To compile this driver as a module, choose M here: the
583           module will be called qdio.
584 
585           If unsure, say Y.
586 
587 menuconfig PCI
588         bool "PCI support"
589         select PCI_MSI
590         select IOMMU_SUPPORT
591         help
592           Enable PCI support.
593 
594 if PCI
595 
596 config PCI_NR_FUNCTIONS
597         int "Maximum number of PCI functions (1-4096)"
598         range 1 4096
599         default "64"
600         help
601           This allows you to specify the maximum number of PCI functions which
602           this kernel will support.
603 
604 config PCI_NR_MSI
605         int "Maximum number of MSI interrupts (64-32768)"
606         range 64 32768
607         default "256"
608         help
609           This defines the number of virtual interrupts the kernel will
610           provide for MSI interrupts. If you configure your system to have
611           too few drivers will fail to allocate MSI interrupts for all
612           PCI devices.
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 endmenu

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