Version:  2.0.40 2.2.26 2.4.37 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 4.9

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_DEVMEM_IS_ALLOWED
 71         select ARCH_HAS_ELF_RANDOMIZE
 72         select ARCH_HAS_GCOV_PROFILE_ALL
 73         select ARCH_HAS_GIGANTIC_PAGE
 74         select ARCH_HAS_KCOV
 75         select ARCH_HAS_SG_CHAIN
 76         select ARCH_HAS_UBSAN_SANITIZE_ALL
 77         select ARCH_HAVE_NMI_SAFE_CMPXCHG
 78         select ARCH_INLINE_READ_LOCK
 79         select ARCH_INLINE_READ_LOCK_BH
 80         select ARCH_INLINE_READ_LOCK_IRQ
 81         select ARCH_INLINE_READ_LOCK_IRQSAVE
 82         select ARCH_INLINE_READ_TRYLOCK
 83         select ARCH_INLINE_READ_UNLOCK
 84         select ARCH_INLINE_READ_UNLOCK_BH
 85         select ARCH_INLINE_READ_UNLOCK_IRQ
 86         select ARCH_INLINE_READ_UNLOCK_IRQRESTORE
 87         select ARCH_INLINE_SPIN_LOCK
 88         select ARCH_INLINE_SPIN_LOCK_BH
 89         select ARCH_INLINE_SPIN_LOCK_IRQ
 90         select ARCH_INLINE_SPIN_LOCK_IRQSAVE
 91         select ARCH_INLINE_SPIN_TRYLOCK
 92         select ARCH_INLINE_SPIN_TRYLOCK_BH
 93         select ARCH_INLINE_SPIN_UNLOCK
 94         select ARCH_INLINE_SPIN_UNLOCK_BH
 95         select ARCH_INLINE_SPIN_UNLOCK_IRQ
 96         select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE
 97         select ARCH_INLINE_WRITE_LOCK
 98         select ARCH_INLINE_WRITE_LOCK_BH
 99         select ARCH_INLINE_WRITE_LOCK_IRQ
100         select ARCH_INLINE_WRITE_LOCK_IRQSAVE
101         select ARCH_INLINE_WRITE_TRYLOCK
102         select ARCH_INLINE_WRITE_UNLOCK
103         select ARCH_INLINE_WRITE_UNLOCK_BH
104         select ARCH_INLINE_WRITE_UNLOCK_IRQ
105         select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE
106         select ARCH_SAVE_PAGE_KEYS if HIBERNATION
107         select ARCH_SUPPORTS_ATOMIC_RMW
108         select ARCH_SUPPORTS_NUMA_BALANCING
109         select ARCH_USE_BUILTIN_BSWAP
110         select ARCH_USE_CMPXCHG_LOCKREF
111         select ARCH_WANTS_DYNAMIC_TASK_STRUCT
112         select ARCH_WANTS_PROT_NUMA_PROT_NONE
113         select ARCH_WANTS_UBSAN_NO_NULL
114         select ARCH_WANT_IPC_PARSE_VERSION
115         select BUILDTIME_EXTABLE_SORT
116         select CLONE_BACKWARDS2
117         select DYNAMIC_FTRACE if FUNCTION_TRACER
118         select GENERIC_CLOCKEVENTS
119         select GENERIC_CPU_AUTOPROBE
120         select GENERIC_CPU_DEVICES if !SMP
121         select GENERIC_FIND_FIRST_BIT
122         select GENERIC_SMP_IDLE_THREAD
123         select GENERIC_TIME_VSYSCALL
124         select HAVE_ALIGNED_STRUCT_PAGE if SLUB
125         select HAVE_ARCH_AUDITSYSCALL
126         select HAVE_ARCH_EARLY_PFN_TO_NID
127         select HAVE_ARCH_HARDENED_USERCOPY
128         select HAVE_ARCH_JUMP_LABEL
129         select CPU_NO_EFFICIENT_FFS if !HAVE_MARCH_Z9_109_FEATURES
130         select HAVE_ARCH_SECCOMP_FILTER
131         select HAVE_ARCH_SOFT_DIRTY
132         select HAVE_ARCH_TRACEHOOK
133         select HAVE_ARCH_TRANSPARENT_HUGEPAGE
134         select HAVE_EBPF_JIT if PACK_STACK && HAVE_MARCH_Z196_FEATURES
135         select HAVE_CMPXCHG_DOUBLE
136         select HAVE_CMPXCHG_LOCAL
137         select HAVE_DEBUG_KMEMLEAK
138         select HAVE_DMA_API_DEBUG
139         select HAVE_DYNAMIC_FTRACE
140         select HAVE_DYNAMIC_FTRACE_WITH_REGS
141         select HAVE_EFFICIENT_UNALIGNED_ACCESS
142         select HAVE_EXIT_THREAD
143         select HAVE_FTRACE_MCOUNT_RECORD
144         select HAVE_FUNCTION_GRAPH_TRACER
145         select HAVE_FUNCTION_TRACER
146         select HAVE_FUTEX_CMPXCHG if FUTEX
147         select HAVE_KERNEL_BZIP2
148         select HAVE_KERNEL_GZIP
149         select HAVE_KERNEL_LZ4
150         select HAVE_KERNEL_LZMA
151         select HAVE_KERNEL_LZO
152         select HAVE_KERNEL_XZ
153         select HAVE_KPROBES
154         select HAVE_KRETPROBES
155         select HAVE_KVM
156         select HAVE_LIVEPATCH
157         select HAVE_MEMBLOCK
158         select HAVE_MEMBLOCK_NODE_MAP
159         select HAVE_MEMBLOCK_PHYS_MAP
160         select HAVE_MOD_ARCH_SPECIFIC
161         select HAVE_OPROFILE
162         select HAVE_PERF_EVENTS
163         select HAVE_REGS_AND_STACK_ACCESS_API
164         select HAVE_SYSCALL_TRACEPOINTS
165         select HAVE_VIRT_CPU_ACCOUNTING
166         select MODULES_USE_ELF_RELA
167         select NO_BOOTMEM
168         select OLD_SIGACTION
169         select OLD_SIGSUSPEND3
170         select SPARSE_IRQ
171         select SYSCTL_EXCEPTION_TRACE
172         select TTY
173         select VIRT_CPU_ACCOUNTING
174         select VIRT_TO_BUS
175         select HAVE_NMI
176 
177 
178 config SCHED_OMIT_FRAME_POINTER
179         def_bool y
180 
181 config PGTABLE_LEVELS
182         int
183         default 4
184 
185 source "init/Kconfig"
186 
187 source "kernel/Kconfig.freezer"
188 
189 source "kernel/livepatch/Kconfig"
190 
191 menu "Processor type and features"
192 
193 config HAVE_MARCH_Z900_FEATURES
194         def_bool n
195 
196 config HAVE_MARCH_Z990_FEATURES
197         def_bool n
198         select HAVE_MARCH_Z900_FEATURES
199 
200 config HAVE_MARCH_Z9_109_FEATURES
201         def_bool n
202         select HAVE_MARCH_Z990_FEATURES
203 
204 config HAVE_MARCH_Z10_FEATURES
205         def_bool n
206         select HAVE_MARCH_Z9_109_FEATURES
207 
208 config HAVE_MARCH_Z196_FEATURES
209         def_bool n
210         select HAVE_MARCH_Z10_FEATURES
211 
212 config HAVE_MARCH_ZEC12_FEATURES
213         def_bool n
214         select HAVE_MARCH_Z196_FEATURES
215 
216 config HAVE_MARCH_Z13_FEATURES
217         def_bool n
218         select HAVE_MARCH_ZEC12_FEATURES
219 
220 choice
221         prompt "Processor type"
222         default MARCH_Z196
223 
224 config MARCH_Z900
225         bool "IBM zSeries model z800 and z900"
226         select HAVE_MARCH_Z900_FEATURES
227         help
228           Select this to enable optimizations for model z800/z900 (2064 and
229           2066 series). This will enable some optimizations that are not
230           available on older ESA/390 (31 Bit) only CPUs.
231 
232 config MARCH_Z990
233         bool "IBM zSeries model z890 and z990"
234         select HAVE_MARCH_Z990_FEATURES
235         help
236           Select this to enable optimizations for model z890/z990 (2084 and
237           2086 series). The kernel will be slightly faster but will not work
238           on older machines.
239 
240 config MARCH_Z9_109
241         bool "IBM System z9"
242         select HAVE_MARCH_Z9_109_FEATURES
243         help
244           Select this to enable optimizations for IBM System z9 (2094 and
245           2096 series). The kernel will be slightly faster but will not work
246           on older machines.
247 
248 config MARCH_Z10
249         bool "IBM System z10"
250         select HAVE_MARCH_Z10_FEATURES
251         help
252           Select this to enable optimizations for IBM System z10 (2097 and
253           2098 series). The kernel will be slightly faster but will not work
254           on older machines.
255 
256 config MARCH_Z196
257         bool "IBM zEnterprise 114 and 196"
258         select HAVE_MARCH_Z196_FEATURES
259         help
260           Select this to enable optimizations for IBM zEnterprise 114 and 196
261           (2818 and 2817 series). The kernel will be slightly faster but will
262           not work on older machines.
263 
264 config MARCH_ZEC12
265         bool "IBM zBC12 and zEC12"
266         select HAVE_MARCH_ZEC12_FEATURES
267         help
268           Select this to enable optimizations for IBM zBC12 and zEC12 (2828 and
269           2827 series). The kernel will be slightly faster but will not work on
270           older machines.
271 
272 config MARCH_Z13
273         bool "IBM z13s and z13"
274         select HAVE_MARCH_Z13_FEATURES
275         help
276           Select this to enable optimizations for IBM z13s and z13 (2965 and
277           2964 series). The kernel will be slightly faster but will not work on
278           older machines.
279 
280 endchoice
281 
282 config MARCH_Z900_TUNE
283         def_bool TUNE_Z900 || MARCH_Z900 && TUNE_DEFAULT
284 
285 config MARCH_Z990_TUNE
286         def_bool TUNE_Z990 || MARCH_Z990 && TUNE_DEFAULT
287 
288 config MARCH_Z9_109_TUNE
289         def_bool TUNE_Z9_109 || MARCH_Z9_109 && TUNE_DEFAULT
290 
291 config MARCH_Z10_TUNE
292         def_bool TUNE_Z10 || MARCH_Z10 && TUNE_DEFAULT
293 
294 config MARCH_Z196_TUNE
295         def_bool TUNE_Z196 || MARCH_Z196 && TUNE_DEFAULT
296 
297 config MARCH_ZEC12_TUNE
298         def_bool TUNE_ZEC12 || MARCH_ZEC12 && TUNE_DEFAULT
299 
300 config MARCH_Z13_TUNE
301         def_bool TUNE_Z13 || MARCH_Z13 && TUNE_DEFAULT
302 
303 choice
304         prompt "Tune code generation"
305         default TUNE_DEFAULT
306         help
307           Cause the compiler to tune (-mtune) the generated code for a machine.
308           This will make the code run faster on the selected machine but
309           somewhat slower on other machines.
310           This option only changes how the compiler emits instructions, not the
311           selection of instructions itself, so the resulting kernel will run on
312           all other machines.
313 
314 config TUNE_DEFAULT
315         bool "Default"
316         help
317           Tune the generated code for the target processor for which the kernel
318           will be compiled.
319 
320 config TUNE_Z900
321         bool "IBM zSeries model z800 and z900"
322 
323 config TUNE_Z990
324         bool "IBM zSeries model z890 and z990"
325 
326 config TUNE_Z9_109
327         bool "IBM System z9"
328 
329 config TUNE_Z10
330         bool "IBM System z10"
331 
332 config TUNE_Z196
333         bool "IBM zEnterprise 114 and 196"
334 
335 config TUNE_ZEC12
336         bool "IBM zBC12 and zEC12"
337 
338 config TUNE_Z13
339         bool "IBM z13"
340 
341 endchoice
342 
343 config 64BIT
344         def_bool y
345 
346 config COMPAT
347         def_bool y
348         prompt "Kernel support for 31 bit emulation"
349         select COMPAT_BINFMT_ELF if BINFMT_ELF
350         select ARCH_WANT_OLD_COMPAT_IPC
351         select COMPAT_OLD_SIGACTION
352         depends on MULTIUSER
353         help
354           Select this option if you want to enable your system kernel to
355           handle system-calls from ELF binaries for 31 bit ESA.  This option
356           (and some other stuff like libraries and such) is needed for
357           executing 31 bit applications.  It is safe to say "Y".
358 
359 config SYSVIPC_COMPAT
360         def_bool y if COMPAT && SYSVIPC
361 
362 config KEYS_COMPAT
363         def_bool y if COMPAT && KEYS
364 
365 config SMP
366         def_bool y
367         prompt "Symmetric multi-processing support"
368         ---help---
369           This enables support for systems with more than one CPU. If you have
370           a system with only one CPU, like most personal computers, say N. If
371           you have a system with more than one CPU, say Y.
372 
373           If you say N here, the kernel will run on uni- and multiprocessor
374           machines, but will use only one CPU of a multiprocessor machine. If
375           you say Y here, the kernel will run on many, but not all,
376           uniprocessor machines. On a uniprocessor machine, the kernel
377           will run faster if you say N here.
378 
379           See also the SMP-HOWTO available at
380           <http://www.tldp.org/docs.html#howto>.
381 
382           Even if you don't know what to do here, say Y.
383 
384 config NR_CPUS
385         int "Maximum number of CPUs (2-512)"
386         range 2 512
387         depends on SMP
388         default "64"
389         help
390           This allows you to specify the maximum number of CPUs which this
391           kernel will support. The maximum supported value is 512 and the
392           minimum value which makes sense is 2.
393 
394           This is purely to save memory - each supported CPU adds
395           approximately sixteen kilobytes to the kernel image.
396 
397 config HOTPLUG_CPU
398         def_bool y
399         prompt "Support for hot-pluggable CPUs"
400         depends on SMP
401         help
402           Say Y here to be able to turn CPUs off and on. CPUs
403           can be controlled through /sys/devices/system/cpu/cpu#.
404           Say N if you want to disable CPU hotplug.
405 
406 # Some NUMA nodes have memory ranges that span
407 # other nodes.  Even though a pfn is valid and
408 # between a node's start and end pfns, it may not
409 # reside on that node.  See memmap_init_zone()
410 # for details. <- They meant memory holes!
411 config NODES_SPAN_OTHER_NODES
412         def_bool NUMA
413 
414 config NUMA
415         bool "NUMA support"
416         depends on SMP && SCHED_TOPOLOGY
417         default n
418         help
419           Enable NUMA support
420 
421           This option adds NUMA support to the kernel.
422 
423           An operation mode can be selected by appending
424           numa=<method> to the kernel command line.
425 
426           The default behaviour is identical to appending numa=plain to
427           the command line. This will create just one node with all
428           available memory and all CPUs in it.
429 
430 config NODES_SHIFT
431         int "Maximum NUMA nodes (as a power of 2)"
432         range 1 10
433         depends on NUMA
434         default "4"
435         help
436           Specify the maximum number of NUMA nodes available on the target
437           system. Increases memory reserved to accommodate various tables.
438 
439 menu "Select NUMA modes"
440         depends on NUMA
441 
442 config NUMA_EMU
443         bool "NUMA emulation"
444         default y
445         help
446           Numa emulation mode will split the available system memory into
447           equal chunks which then are distributed over the configured number
448           of nodes in a round-robin manner.
449 
450           The number of fake nodes is limited by the number of available memory
451           chunks (i.e. memory size / fake size) and the number of supported
452           nodes in the kernel.
453 
454           The CPUs are assigned to the nodes in a way that partially respects
455           the original machine topology (if supported by the machine).
456           Fair distribution of the CPUs is not guaranteed.
457 
458 config EMU_SIZE
459         hex "NUMA emulation memory chunk size"
460         default 0x10000000
461         range 0x400000 0x100000000
462         depends on NUMA_EMU
463         help
464           Select the default size by which the memory is chopped and then
465           assigned to emulated NUMA nodes.
466 
467           This can be overridden by specifying
468 
469           emu_size=<n>
470 
471           on the kernel command line where also suffixes K, M, G, and T are
472           supported.
473 
474 endmenu
475 
476 config SCHED_SMT
477         def_bool n
478 
479 config SCHED_MC
480         def_bool n
481 
482 config SCHED_BOOK
483         def_bool n
484 
485 config SCHED_DRAWER
486         def_bool n
487 
488 config SCHED_TOPOLOGY
489         def_bool y
490         prompt "Topology scheduler support"
491         depends on SMP
492         select SCHED_SMT
493         select SCHED_MC
494         select SCHED_BOOK
495         select SCHED_DRAWER
496         help
497           Topology scheduler support improves the CPU scheduler's decision
498           making when dealing with machines that have multi-threading,
499           multiple cores or multiple books.
500 
501 source kernel/Kconfig.preempt
502 
503 source kernel/Kconfig.hz
504 
505 endmenu
506 
507 menu "Memory setup"
508 
509 config ARCH_SPARSEMEM_ENABLE
510         def_bool y
511         select SPARSEMEM_VMEMMAP_ENABLE
512         select SPARSEMEM_VMEMMAP
513 
514 config ARCH_SPARSEMEM_DEFAULT
515         def_bool y
516 
517 config ARCH_SELECT_MEMORY_MODEL
518         def_bool y
519 
520 config ARCH_ENABLE_MEMORY_HOTPLUG
521         def_bool y if SPARSEMEM
522 
523 config ARCH_ENABLE_MEMORY_HOTREMOVE
524         def_bool y
525 
526 config ARCH_ENABLE_SPLIT_PMD_PTLOCK
527         def_bool y
528 
529 config FORCE_MAX_ZONEORDER
530         int
531         default "9"
532 
533 source "mm/Kconfig"
534 
535 config PACK_STACK
536         def_bool y
537         prompt "Pack kernel stack"
538         help
539           This option enables the compiler option -mkernel-backchain if it
540           is available. If the option is available the compiler supports
541           the new stack layout which dramatically reduces the minimum stack
542           frame size. With an old compiler a non-leaf function needs a
543           minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
544           -mkernel-backchain the minimum size drops to 16 byte on 31 bit
545           and 24 byte on 64 bit.
546 
547           Say Y if you are unsure.
548 
549 config CHECK_STACK
550         def_bool y
551         prompt "Detect kernel stack overflow"
552         help
553           This option enables the compiler option -mstack-guard and
554           -mstack-size if they are available. If the compiler supports them
555           it will emit additional code to each function prolog to trigger
556           an illegal operation if the kernel stack is about to overflow.
557 
558           Say N if you are unsure.
559 
560 config STACK_GUARD
561         int "Size of the guard area (128-1024)"
562         range 128 1024
563         depends on CHECK_STACK
564         default "256"
565         help
566           This allows you to specify the size of the guard area at the lower
567           end of the kernel stack. If the kernel stack points into the guard
568           area on function entry an illegal operation is triggered. The size
569           needs to be a power of 2. Please keep in mind that the size of an
570           interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
571           The minimum size for the stack guard should be 256 for 31 bit and
572           512 for 64 bit.
573 
574 config WARN_DYNAMIC_STACK
575         def_bool n
576         prompt "Emit compiler warnings for function with dynamic stack usage"
577         help
578           This option enables the compiler option -mwarn-dynamicstack. If the
579           compiler supports this options generates warnings for functions
580           that dynamically allocate stack space using alloca.
581 
582           Say N if you are unsure.
583 
584 endmenu
585 
586 menu "I/O subsystem"
587 
588 config QDIO
589         def_tristate y
590         prompt "QDIO support"
591         ---help---
592           This driver provides the Queued Direct I/O base support for
593           IBM System z.
594 
595           To compile this driver as a module, choose M here: the
596           module will be called qdio.
597 
598           If unsure, say Y.
599 
600 menuconfig PCI
601         bool "PCI support"
602         select PCI_MSI
603         select IOMMU_SUPPORT
604         help
605           Enable PCI support.
606 
607 if PCI
608 
609 config PCI_NR_FUNCTIONS
610         int "Maximum number of PCI functions (1-4096)"
611         range 1 4096
612         default "64"
613         help
614           This allows you to specify the maximum number of PCI functions which
615           this kernel will support.
616 
617 source "drivers/pci/Kconfig"
618 
619 endif   # PCI
620 
621 config PCI_DOMAINS
622         def_bool PCI
623 
624 config HAS_IOMEM
625         def_bool PCI
626 
627 config IOMMU_HELPER
628         def_bool PCI
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 config S390_GUEST_OLD_TRANSPORT
878         def_bool y
879         prompt "Guest support for old s390 virtio transport (DEPRECATED)"
880         depends on S390_GUEST
881         help
882           Enable this option to add support for the old s390-virtio
883           transport (i.e. virtio devices NOT based on virtio-ccw). This
884           type of virtio devices is only available on the experimental
885           kuli userspace or with old (< 2.6) qemu. If you are running
886           with a modern version of qemu (which supports virtio-ccw since
887           1.4 and uses it by default since version 2.4), you probably won't
888           need this.
889 
890 endmenu

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