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1config MMU
2 def_bool y
3
4config ZONE_DMA
5 def_bool y
6
7config LOCKDEP_SUPPORT
8 def_bool y
9
10config STACKTRACE_SUPPORT
11 def_bool y
12
13config HAVE_LATENCYTOP_SUPPORT
14 def_bool y
15
16config RWSEM_GENERIC_SPINLOCK
17 bool
18
19config RWSEM_XCHGADD_ALGORITHM
20 def_bool y
21
22config ARCH_HAS_ILOG2_U32
23 def_bool n
24
25config ARCH_HAS_ILOG2_U64
26 def_bool n
27
28config GENERIC_HWEIGHT
29 def_bool y
30
31config GENERIC_BUG
32 def_bool y if BUG
33
34config GENERIC_BUG_RELATIVE_POINTERS
35 def_bool y
36
37config NO_IOMEM
38 def_bool y
39
40config NO_DMA
41 def_bool y
42
43config ARCH_DMA_ADDR_T_64BIT
44 def_bool 64BIT
45
46config GENERIC_LOCKBREAK
47 def_bool y if SMP && PREEMPT
48
49config PGSTE
50 def_bool y if KVM
51
52config VIRT_CPU_ACCOUNTING
53 def_bool y
54
55config ARCH_SUPPORTS_DEBUG_PAGEALLOC
56 def_bool y
57
58config S390
59 def_bool y
60 select USE_GENERIC_SMP_HELPERS if SMP
61 select GENERIC_CPU_DEVICES if !SMP
62 select HAVE_SYSCALL_WRAPPERS
63 select HAVE_FUNCTION_TRACER
64 select HAVE_FUNCTION_TRACE_MCOUNT_TEST
65 select HAVE_FTRACE_MCOUNT_RECORD
66 select HAVE_C_RECORDMCOUNT
67 select HAVE_SYSCALL_TRACEPOINTS
68 select HAVE_DYNAMIC_FTRACE
69 select HAVE_FUNCTION_GRAPH_TRACER
70 select HAVE_REGS_AND_STACK_ACCESS_API
71 select HAVE_OPROFILE
72 select HAVE_KPROBES
73 select HAVE_KRETPROBES
74 select HAVE_KVM if 64BIT
75 select HAVE_ARCH_TRACEHOOK
76 select INIT_ALL_POSSIBLE
77 select HAVE_IRQ_WORK
78 select HAVE_PERF_EVENTS
79 select ARCH_HAVE_NMI_SAFE_CMPXCHG
80 select HAVE_KERNEL_GZIP
81 select HAVE_KERNEL_BZIP2
82 select HAVE_KERNEL_LZMA
83 select HAVE_KERNEL_LZO
84 select HAVE_KERNEL_XZ
85 select HAVE_ARCH_MUTEX_CPU_RELAX
86 select HAVE_ARCH_JUMP_LABEL if !MARCH_G5
87 select ARCH_SAVE_PAGE_KEYS if HIBERNATION
88 select HAVE_MEMBLOCK
89 select HAVE_MEMBLOCK_NODE_MAP
90 select HAVE_CMPXCHG_LOCAL
91 select ARCH_DISCARD_MEMBLOCK
92 select ARCH_INLINE_SPIN_TRYLOCK
93 select ARCH_INLINE_SPIN_TRYLOCK_BH
94 select ARCH_INLINE_SPIN_LOCK
95 select ARCH_INLINE_SPIN_LOCK_BH
96 select ARCH_INLINE_SPIN_LOCK_IRQ
97 select ARCH_INLINE_SPIN_LOCK_IRQSAVE
98 select ARCH_INLINE_SPIN_UNLOCK
99 select ARCH_INLINE_SPIN_UNLOCK_BH
100 select ARCH_INLINE_SPIN_UNLOCK_IRQ
101 select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE
102 select ARCH_INLINE_READ_TRYLOCK
103 select ARCH_INLINE_READ_LOCK
104 select ARCH_INLINE_READ_LOCK_BH
105 select ARCH_INLINE_READ_LOCK_IRQ
106 select ARCH_INLINE_READ_LOCK_IRQSAVE
107 select ARCH_INLINE_READ_UNLOCK
108 select ARCH_INLINE_READ_UNLOCK_BH
109 select ARCH_INLINE_READ_UNLOCK_IRQ
110 select ARCH_INLINE_READ_UNLOCK_IRQRESTORE
111 select ARCH_INLINE_WRITE_TRYLOCK
112 select ARCH_INLINE_WRITE_LOCK
113 select ARCH_INLINE_WRITE_LOCK_BH
114 select ARCH_INLINE_WRITE_LOCK_IRQ
115 select ARCH_INLINE_WRITE_LOCK_IRQSAVE
116 select ARCH_INLINE_WRITE_UNLOCK
117 select ARCH_INLINE_WRITE_UNLOCK_BH
118 select ARCH_INLINE_WRITE_UNLOCK_IRQ
119 select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE
120 select GENERIC_SMP_IDLE_THREAD
121 select GENERIC_TIME_VSYSCALL
122 select GENERIC_CLOCKEVENTS
123 select KTIME_SCALAR if 32BIT
124
125config SCHED_OMIT_FRAME_POINTER
126 def_bool y
127
128source "init/Kconfig"
129
130source "kernel/Kconfig.freezer"
131
132menu "Base setup"
133
134comment "Processor type and features"
135
136config 64BIT
137 def_bool y
138 prompt "64 bit kernel"
139 help
140 Select this option if you have an IBM z/Architecture machine
141 and want to use the 64 bit addressing mode.
142
143config 32BIT
144 def_bool y if !64BIT
145
146config SMP
147 def_bool y
148 prompt "Symmetric multi-processing support"
149 ---help---
150 This enables support for systems with more than one CPU. If you have
151 a system with only one CPU, like most personal computers, say N. If
152 you have a system with more than one CPU, say Y.
153
154 If you say N here, the kernel will run on single and multiprocessor
155 machines, but will use only one CPU of a multiprocessor machine. If
156 you say Y here, the kernel will run on many, but not all,
157 singleprocessor machines. On a singleprocessor machine, the kernel
158 will run faster if you say N here.
159
160 See also the SMP-HOWTO available at
161 <http://www.tldp.org/docs.html#howto>.
162
163 Even if you don't know what to do here, say Y.
164
165config NR_CPUS
166 int "Maximum number of CPUs (2-64)"
167 range 2 64
168 depends on SMP
169 default "32" if !64BIT
170 default "64" if 64BIT
171 help
172 This allows you to specify the maximum number of CPUs which this
173 kernel will support. The maximum supported value is 64 and the
174 minimum value which makes sense is 2.
175
176 This is purely to save memory - each supported CPU adds
177 approximately sixteen kilobytes to the kernel image.
178
179config HOTPLUG_CPU
180 def_bool y
181 prompt "Support for hot-pluggable CPUs"
182 depends on SMP
183 select HOTPLUG
184 help
185 Say Y here to be able to turn CPUs off and on. CPUs
186 can be controlled through /sys/devices/system/cpu/cpu#.
187 Say N if you want to disable CPU hotplug.
188
189config SCHED_MC
190 def_bool n
191
192config SCHED_BOOK
193 def_bool y
194 prompt "Book scheduler support"
195 depends on SMP
196 select SCHED_MC
197 help
198 Book scheduler support improves the CPU scheduler's decision making
199 when dealing with machines that have several books.
200
201config MATHEMU
202 def_bool y
203 prompt "IEEE FPU emulation"
204 depends on MARCH_G5
205 help
206 This option is required for IEEE compliant floating point arithmetic
207 on older ESA/390 machines. Say Y unless you know your machine doesn't
208 need this.
209
210config COMPAT
211 def_bool y
212 prompt "Kernel support for 31 bit emulation"
213 depends on 64BIT
214 select COMPAT_BINFMT_ELF if BINFMT_ELF
215 select ARCH_WANT_OLD_COMPAT_IPC
216 help
217 Select this option if you want to enable your system kernel to
218 handle system-calls from ELF binaries for 31 bit ESA. This option
219 (and some other stuff like libraries and such) is needed for
220 executing 31 bit applications. It is safe to say "Y".
221
222config SYSVIPC_COMPAT
223 def_bool y if COMPAT && SYSVIPC
224
225config KEYS_COMPAT
226 def_bool y if COMPAT && KEYS
227
228config AUDIT_ARCH
229 def_bool y
230
231config HAVE_MARCH_Z900_FEATURES
232 def_bool n
233
234config HAVE_MARCH_Z990_FEATURES
235 def_bool n
236 select HAVE_MARCH_Z900_FEATURES
237
238config HAVE_MARCH_Z9_109_FEATURES
239 def_bool n
240 select HAVE_MARCH_Z990_FEATURES
241
242config HAVE_MARCH_Z10_FEATURES
243 def_bool n
244 select HAVE_MARCH_Z9_109_FEATURES
245
246config HAVE_MARCH_Z196_FEATURES
247 def_bool n
248 select HAVE_MARCH_Z10_FEATURES
249
250comment "Code generation options"
251
252choice
253 prompt "Processor type"
254 default MARCH_G5
255
256config MARCH_G5
257 bool "System/390 model G5 and G6"
258 depends on !64BIT
259 help
260 Select this to build a 31 bit kernel that works
261 on all ESA/390 and z/Architecture machines.
262
263config MARCH_Z900
264 bool "IBM zSeries model z800 and z900"
265 select HAVE_MARCH_Z900_FEATURES if 64BIT
266 help
267 Select this to enable optimizations for model z800/z900 (2064 and
268 2066 series). This will enable some optimizations that are not
269 available on older ESA/390 (31 Bit) only CPUs.
270
271config MARCH_Z990
272 bool "IBM zSeries model z890 and z990"
273 select HAVE_MARCH_Z990_FEATURES if 64BIT
274 help
275 Select this to enable optimizations for model z890/z990 (2084 and
276 2086 series). The kernel will be slightly faster but will not work
277 on older machines.
278
279config MARCH_Z9_109
280 bool "IBM System z9"
281 select HAVE_MARCH_Z9_109_FEATURES if 64BIT
282 help
283 Select this to enable optimizations for IBM System z9 (2094 and
284 2096 series). The kernel will be slightly faster but will not work
285 on older machines.
286
287config MARCH_Z10
288 bool "IBM System z10"
289 select HAVE_MARCH_Z10_FEATURES if 64BIT
290 help
291 Select this to enable optimizations for IBM System z10 (2097 and
292 2098 series). The kernel will be slightly faster but will not work
293 on older machines.
294
295config MARCH_Z196
296 bool "IBM zEnterprise 114 and 196"
297 select HAVE_MARCH_Z196_FEATURES if 64BIT
298 help
299 Select this to enable optimizations for IBM zEnterprise 114 and 196
300 (2818 and 2817 series). The kernel will be slightly faster but will
301 not work on older machines.
302
303endchoice
304
305config PACK_STACK
306 def_bool y
307 prompt "Pack kernel stack"
308 help
309 This option enables the compiler option -mkernel-backchain if it
310 is available. If the option is available the compiler supports
311 the new stack layout which dramatically reduces the minimum stack
312 frame size. With an old compiler a non-leaf function needs a
313 minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
314 -mkernel-backchain the minimum size drops to 16 byte on 31 bit
315 and 24 byte on 64 bit.
316
317 Say Y if you are unsure.
318
319config SMALL_STACK
320 def_bool n
321 prompt "Use 8kb for kernel stack instead of 16kb"
322 depends on PACK_STACK && 64BIT && !LOCKDEP
323 help
324 If you say Y here and the compiler supports the -mkernel-backchain
325 option the kernel will use a smaller kernel stack size. The reduced
326 size is 8kb instead of 16kb. This allows to run more threads on a
327 system and reduces the pressure on the memory management for higher
328 order page allocations.
329
330 Say N if you are unsure.
331
332config CHECK_STACK
333 def_bool y
334 prompt "Detect kernel stack overflow"
335 help
336 This option enables the compiler option -mstack-guard and
337 -mstack-size if they are available. If the compiler supports them
338 it will emit additional code to each function prolog to trigger
339 an illegal operation if the kernel stack is about to overflow.
340
341 Say N if you are unsure.
342
343config STACK_GUARD
344 int "Size of the guard area (128-1024)"
345 range 128 1024
346 depends on CHECK_STACK
347 default "256"
348 help
349 This allows you to specify the size of the guard area at the lower
350 end of the kernel stack. If the kernel stack points into the guard
351 area on function entry an illegal operation is triggered. The size
352 needs to be a power of 2. Please keep in mind that the size of an
353 interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
354 The minimum size for the stack guard should be 256 for 31 bit and
355 512 for 64 bit.
356
357config WARN_DYNAMIC_STACK
358 def_bool n
359 prompt "Emit compiler warnings for function with dynamic stack usage"
360 help
361 This option enables the compiler option -mwarn-dynamicstack. If the
362 compiler supports this options generates warnings for functions
363 that dynamically allocate stack space using alloca.
364
365 Say N if you are unsure.
366
367comment "Kernel preemption"
368
369source "kernel/Kconfig.preempt"
370
371config ARCH_SPARSEMEM_ENABLE
372 def_bool y
373 select SPARSEMEM_VMEMMAP_ENABLE
374 select SPARSEMEM_VMEMMAP
375 select SPARSEMEM_STATIC if !64BIT
376
377config ARCH_SPARSEMEM_DEFAULT
378 def_bool y
379
380config ARCH_SELECT_MEMORY_MODEL
381 def_bool y
382
383config ARCH_ENABLE_MEMORY_HOTPLUG
384 def_bool y if SPARSEMEM
385
386config ARCH_ENABLE_MEMORY_HOTREMOVE
387 def_bool y
388
389config ARCH_HIBERNATION_POSSIBLE
390 def_bool y if 64BIT
391
392source "mm/Kconfig"
393
394comment "I/O subsystem configuration"
395
396config QDIO
397 def_tristate y
398 prompt "QDIO support"
399 ---help---
400 This driver provides the Queued Direct I/O base support for
401 IBM System z.
402
403 To compile this driver as a module, choose M here: the
404 module will be called qdio.
405
406 If unsure, say Y.
407
408config CHSC_SCH
409 def_tristate m
410 prompt "Support for CHSC subchannels"
411 help
412 This driver allows usage of CHSC subchannels. A CHSC subchannel
413 is usually present on LPAR only.
414 The driver creates a device /dev/chsc, which may be used to
415 obtain I/O configuration information about the machine and
416 to issue asynchronous chsc commands (DANGEROUS).
417 You will usually only want to use this interface on a special
418 LPAR designated for system management.
419
420 To compile this driver as a module, choose M here: the
421 module will be called chsc_sch.
422
423 If unsure, say N.
424
425comment "Misc"
426
427source "fs/Kconfig.binfmt"
428
429config FORCE_MAX_ZONEORDER
430 int
431 default "9"
432
433config PFAULT
434 def_bool y
435 prompt "Pseudo page fault support"
436 help
437 Select this option, if you want to use PFAULT pseudo page fault
438 handling under VM. If running native or in LPAR, this option
439 has no effect. If your VM does not support PFAULT, PAGEEX
440 pseudo page fault handling will be used.
441 Note that VM 4.2 supports PFAULT but has a bug in its
442 implementation that causes some problems.
443 Everybody who wants to run Linux under VM != VM4.2 should select
444 this option.
445
446config SHARED_KERNEL
447 def_bool y
448 prompt "VM shared kernel support"
449 help
450 Select this option, if you want to share the text segment of the
451 Linux kernel between different VM guests. This reduces memory
452 usage with lots of guests but greatly increases kernel size.
453 Also if a kernel was IPL'ed from a shared segment the kexec system
454 call will not work.
455 You should only select this option if you know what you are
456 doing and want to exploit this feature.
457
458config CMM
459 def_tristate n
460 prompt "Cooperative memory management"
461 help
462 Select this option, if you want to enable the kernel interface
463 to reduce the memory size of the system. This is accomplished
464 by allocating pages of memory and put them "on hold". This only
465 makes sense for a system running under VM where the unused pages
466 will be reused by VM for other guest systems. The interface
467 allows an external monitor to balance memory of many systems.
468 Everybody who wants to run Linux under VM should select this
469 option.
470
471config CMM_IUCV
472 def_bool y
473 prompt "IUCV special message interface to cooperative memory management"
474 depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
475 help
476 Select this option to enable the special message interface to
477 the cooperative memory management.
478
479config APPLDATA_BASE
480 def_bool n
481 prompt "Linux - VM Monitor Stream, base infrastructure"
482 depends on PROC_FS
483 help
484 This provides a kernel interface for creating and updating z/VM APPLDATA
485 monitor records. The monitor records are updated at certain time
486 intervals, once the timer is started.
487 Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
488 i.e. enables or disables monitoring on the Linux side.
489 A custom interval value (in seconds) can be written to
490 /proc/appldata/interval.
491
492 Defaults are 60 seconds interval and timer off.
493 The /proc entries can also be read from, showing the current settings.
494
495config APPLDATA_MEM
496 def_tristate m
497 prompt "Monitor memory management statistics"
498 depends on APPLDATA_BASE && VM_EVENT_COUNTERS
499 help
500 This provides memory management related data to the Linux - VM Monitor
501 Stream, like paging/swapping rate, memory utilisation, etc.
502 Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
503 APPLDATA monitor record, i.e. enables or disables monitoring this record
504 on the z/VM side.
505
506 Default is disabled.
507 The /proc entry can also be read from, showing the current settings.
508
509 This can also be compiled as a module, which will be called
510 appldata_mem.o.
511
512config APPLDATA_OS
513 def_tristate m
514 prompt "Monitor OS statistics"
515 depends on APPLDATA_BASE
516 help
517 This provides OS related data to the Linux - VM Monitor Stream, like
518 CPU utilisation, etc.
519 Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
520 APPLDATA monitor record, i.e. enables or disables monitoring this record
521 on the z/VM side.
522
523 Default is disabled.
524 This can also be compiled as a module, which will be called
525 appldata_os.o.
526
527config APPLDATA_NET_SUM
528 def_tristate m
529 prompt "Monitor overall network statistics"
530 depends on APPLDATA_BASE && NET
531 help
532 This provides network related data to the Linux - VM Monitor Stream,
533 currently there is only a total sum of network I/O statistics, no
534 per-interface data.
535 Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
536 APPLDATA monitor record, i.e. enables or disables monitoring this record
537 on the z/VM side.
538
539 Default is disabled.
540 This can also be compiled as a module, which will be called
541 appldata_net_sum.o.
542
543source kernel/Kconfig.hz
544
545config S390_HYPFS_FS
546 def_bool y
547 prompt "s390 hypervisor file system support"
548 select SYS_HYPERVISOR
549 help
550 This is a virtual file system intended to provide accounting
551 information in an s390 hypervisor environment.
552
553config KEXEC
554 def_bool n
555 prompt "kexec system call"
556 help
557 kexec is a system call that implements the ability to shutdown your
558 current kernel, and to start another kernel. It is like a reboot
559 but is independent of hardware/microcode support.
560
561config CRASH_DUMP
562 bool "kernel crash dumps"
563 depends on 64BIT && SMP
564 select KEXEC
565 help
566 Generate crash dump after being started by kexec.
567 Crash dump kernels are loaded in the main kernel with kexec-tools
568 into a specially reserved region and then later executed after
569 a crash by kdump/kexec.
570 For more details see Documentation/kdump/kdump.txt
571
572config ZFCPDUMP
573 def_bool n
574 prompt "zfcpdump support"
575 select SMP
576 help
577 Select this option if you want to build an zfcpdump enabled kernel.
578 Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this.
579
580config S390_GUEST
581 def_bool y
582 prompt "s390 guest support for KVM (EXPERIMENTAL)"
583 depends on 64BIT && EXPERIMENTAL
584 select VIRTUALIZATION
585 select VIRTIO
586 select VIRTIO_RING
587 select VIRTIO_CONSOLE
588 help
589 Select this option if you want to run the kernel as a guest under
590 the KVM hypervisor. This will add detection for KVM as well as a
591 virtio transport. If KVM is detected, the virtio console will be
592 the default console.
593
594config SECCOMP
595 def_bool y
596 prompt "Enable seccomp to safely compute untrusted bytecode"
597 depends on PROC_FS
598 help
599 This kernel feature is useful for number crunching applications
600 that may need to compute untrusted bytecode during their
601 execution. By using pipes or other transports made available to
602 the process as file descriptors supporting the read/write
603 syscalls, it's possible to isolate those applications in
604 their own address space using seccomp. Once seccomp is
605 enabled via /proc/<pid>/seccomp, it cannot be disabled
606 and the task is only allowed to execute a few safe syscalls
607 defined by each seccomp mode.
608
609 If unsure, say Y.
610
611endmenu
612
613menu "Power Management"
614
615source "kernel/power/Kconfig"
616
617endmenu
618
619source "net/Kconfig"
620
621config PCMCIA
622 def_bool n
623
624config CCW
625 def_bool y
626
627source "drivers/Kconfig"
628
629source "fs/Kconfig"
630
631source "arch/s390/Kconfig.debug"
632
633source "security/Kconfig"
634
635source "crypto/Kconfig"
636
637source "lib/Kconfig"
638
639source "arch/s390/kvm/Kconfig"
1# SPDX-License-Identifier: GPL-2.0
2config MMU
3 def_bool y
4
5config ZONE_DMA
6 def_bool y
7
8config CPU_BIG_ENDIAN
9 def_bool y
10
11config LOCKDEP_SUPPORT
12 def_bool y
13
14config STACKTRACE_SUPPORT
15 def_bool y
16
17config RWSEM_GENERIC_SPINLOCK
18 bool
19
20config RWSEM_XCHGADD_ALGORITHM
21 def_bool y
22
23config ARCH_HAS_ILOG2_U32
24 def_bool n
25
26config ARCH_HAS_ILOG2_U64
27 def_bool n
28
29config GENERIC_HWEIGHT
30 def_bool y
31
32config GENERIC_BUG
33 def_bool y if BUG
34
35config GENERIC_BUG_RELATIVE_POINTERS
36 def_bool y
37
38config ARCH_DMA_ADDR_T_64BIT
39 def_bool y
40
41config GENERIC_LOCKBREAK
42 def_bool y if SMP && PREEMPT
43
44config PGSTE
45 def_bool y if KVM
46
47config ARCH_SUPPORTS_DEBUG_PAGEALLOC
48 def_bool y
49
50config AUDIT_ARCH
51 def_bool y
52
53config NO_IOPORT_MAP
54 def_bool y
55
56config PCI_QUIRKS
57 def_bool n
58
59config ARCH_SUPPORTS_UPROBES
60 def_bool y
61
62config S390
63 def_bool y
64 select ARCH_BINFMT_ELF_STATE
65 select ARCH_HAS_DEVMEM_IS_ALLOWED
66 select ARCH_HAS_ELF_RANDOMIZE
67 select ARCH_HAS_FORTIFY_SOURCE
68 select ARCH_HAS_GCOV_PROFILE_ALL
69 select ARCH_HAS_GIGANTIC_PAGE if (MEMORY_ISOLATION && COMPACTION) || CMA
70 select ARCH_HAS_KCOV
71 select ARCH_HAS_SET_MEMORY
72 select ARCH_HAS_SG_CHAIN
73 select ARCH_HAS_STRICT_KERNEL_RWX
74 select ARCH_HAS_STRICT_MODULE_RWX
75 select ARCH_HAS_UBSAN_SANITIZE_ALL
76 select ARCH_HAVE_NMI_SAFE_CMPXCHG
77 select ARCH_INLINE_READ_LOCK
78 select ARCH_INLINE_READ_LOCK_BH
79 select ARCH_INLINE_READ_LOCK_IRQ
80 select ARCH_INLINE_READ_LOCK_IRQSAVE
81 select ARCH_INLINE_READ_TRYLOCK
82 select ARCH_INLINE_READ_UNLOCK
83 select ARCH_INLINE_READ_UNLOCK_BH
84 select ARCH_INLINE_READ_UNLOCK_IRQ
85 select ARCH_INLINE_READ_UNLOCK_IRQRESTORE
86 select ARCH_INLINE_SPIN_LOCK
87 select ARCH_INLINE_SPIN_LOCK_BH
88 select ARCH_INLINE_SPIN_LOCK_IRQ
89 select ARCH_INLINE_SPIN_LOCK_IRQSAVE
90 select ARCH_INLINE_SPIN_TRYLOCK
91 select ARCH_INLINE_SPIN_TRYLOCK_BH
92 select ARCH_INLINE_SPIN_UNLOCK
93 select ARCH_INLINE_SPIN_UNLOCK_BH
94 select ARCH_INLINE_SPIN_UNLOCK_IRQ
95 select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE
96 select ARCH_INLINE_WRITE_LOCK
97 select ARCH_INLINE_WRITE_LOCK_BH
98 select ARCH_INLINE_WRITE_LOCK_IRQ
99 select ARCH_INLINE_WRITE_LOCK_IRQSAVE
100 select ARCH_INLINE_WRITE_TRYLOCK
101 select ARCH_INLINE_WRITE_UNLOCK
102 select ARCH_INLINE_WRITE_UNLOCK_BH
103 select ARCH_INLINE_WRITE_UNLOCK_IRQ
104 select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE
105 select ARCH_SAVE_PAGE_KEYS if HIBERNATION
106 select ARCH_SUPPORTS_ATOMIC_RMW
107 select ARCH_SUPPORTS_NUMA_BALANCING
108 select ARCH_USE_BUILTIN_BSWAP
109 select ARCH_USE_CMPXCHG_LOCKREF
110 select ARCH_WANTS_DYNAMIC_TASK_STRUCT
111 select ARCH_WANTS_UBSAN_NO_NULL
112 select ARCH_WANT_IPC_PARSE_VERSION
113 select BUILDTIME_EXTABLE_SORT
114 select CLONE_BACKWARDS2
115 select DYNAMIC_FTRACE if FUNCTION_TRACER
116 select GENERIC_CLOCKEVENTS
117 select GENERIC_CPU_AUTOPROBE
118 select GENERIC_CPU_DEVICES if !SMP
119 select GENERIC_CPU_VULNERABILITIES
120 select GENERIC_FIND_FIRST_BIT
121 select GENERIC_SMP_IDLE_THREAD
122 select GENERIC_TIME_VSYSCALL
123 select HAVE_ALIGNED_STRUCT_PAGE if SLUB
124 select HAVE_ARCH_AUDITSYSCALL
125 select HAVE_ARCH_JUMP_LABEL
126 select CPU_NO_EFFICIENT_FFS if !HAVE_MARCH_Z9_109_FEATURES
127 select HAVE_ARCH_SECCOMP_FILTER
128 select HAVE_ARCH_SOFT_DIRTY
129 select HAVE_ARCH_TRACEHOOK
130 select HAVE_ARCH_TRANSPARENT_HUGEPAGE
131 select HAVE_EBPF_JIT if PACK_STACK && HAVE_MARCH_Z196_FEATURES
132 select HAVE_CMPXCHG_DOUBLE
133 select HAVE_CMPXCHG_LOCAL
134 select HAVE_COPY_THREAD_TLS
135 select HAVE_DEBUG_KMEMLEAK
136 select HAVE_DMA_API_DEBUG
137 select HAVE_DMA_CONTIGUOUS
138 select DMA_DIRECT_OPS
139 select HAVE_DYNAMIC_FTRACE
140 select HAVE_DYNAMIC_FTRACE_WITH_REGS
141 select HAVE_EFFICIENT_UNALIGNED_ACCESS
142 select HAVE_FTRACE_MCOUNT_RECORD
143 select HAVE_FUNCTION_GRAPH_TRACER
144 select HAVE_FUNCTION_TRACER
145 select HAVE_FUTEX_CMPXCHG if FUTEX
146 select HAVE_GCC_PLUGINS
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_PERF_REGS
158 select HAVE_PERF_USER_STACK_DUMP
159 select HAVE_MEMBLOCK
160 select HAVE_MEMBLOCK_NODE_MAP
161 select HAVE_MEMBLOCK_PHYS_MAP
162 select HAVE_MOD_ARCH_SPECIFIC
163 select HAVE_OPROFILE
164 select HAVE_PERF_EVENTS
165 select HAVE_REGS_AND_STACK_ACCESS_API
166 select HAVE_SYSCALL_TRACEPOINTS
167 select HAVE_VIRT_CPU_ACCOUNTING
168 select MODULES_USE_ELF_RELA
169 select NO_BOOTMEM
170 select OLD_SIGACTION
171 select OLD_SIGSUSPEND3
172 select SPARSE_IRQ
173 select SYSCTL_EXCEPTION_TRACE
174 select THREAD_INFO_IN_TASK
175 select TTY
176 select VIRT_CPU_ACCOUNTING
177 select ARCH_HAS_SCALED_CPUTIME
178 select VIRT_TO_BUS
179 select HAVE_NMI
180
181
182config SCHED_OMIT_FRAME_POINTER
183 def_bool y
184
185config PGTABLE_LEVELS
186 int
187 default 5
188
189source "init/Kconfig"
190
191source "kernel/Kconfig.freezer"
192
193source "kernel/livepatch/Kconfig"
194
195menu "Processor type and features"
196
197config HAVE_MARCH_Z900_FEATURES
198 def_bool n
199
200config HAVE_MARCH_Z990_FEATURES
201 def_bool n
202 select HAVE_MARCH_Z900_FEATURES
203
204config HAVE_MARCH_Z9_109_FEATURES
205 def_bool n
206 select HAVE_MARCH_Z990_FEATURES
207
208config HAVE_MARCH_Z10_FEATURES
209 def_bool n
210 select HAVE_MARCH_Z9_109_FEATURES
211
212config HAVE_MARCH_Z196_FEATURES
213 def_bool n
214 select HAVE_MARCH_Z10_FEATURES
215
216config HAVE_MARCH_ZEC12_FEATURES
217 def_bool n
218 select HAVE_MARCH_Z196_FEATURES
219
220config HAVE_MARCH_Z13_FEATURES
221 def_bool n
222 select HAVE_MARCH_ZEC12_FEATURES
223
224config HAVE_MARCH_Z14_FEATURES
225 def_bool n
226 select HAVE_MARCH_Z13_FEATURES
227
228choice
229 prompt "Processor type"
230 default MARCH_Z196
231
232config MARCH_Z900
233 bool "IBM zSeries model z800 and z900"
234 select HAVE_MARCH_Z900_FEATURES
235 help
236 Select this to enable optimizations for model z800/z900 (2064 and
237 2066 series). This will enable some optimizations that are not
238 available on older ESA/390 (31 Bit) only CPUs.
239
240config MARCH_Z990
241 bool "IBM zSeries model z890 and z990"
242 select HAVE_MARCH_Z990_FEATURES
243 help
244 Select this to enable optimizations for model z890/z990 (2084 and
245 2086 series). The kernel will be slightly faster but will not work
246 on older machines.
247
248config MARCH_Z9_109
249 bool "IBM System z9"
250 select HAVE_MARCH_Z9_109_FEATURES
251 help
252 Select this to enable optimizations for IBM System z9 (2094 and
253 2096 series). The kernel will be slightly faster but will not work
254 on older machines.
255
256config MARCH_Z10
257 bool "IBM System z10"
258 select HAVE_MARCH_Z10_FEATURES
259 help
260 Select this to enable optimizations for IBM System z10 (2097 and
261 2098 series). The kernel will be slightly faster but will not work
262 on older machines.
263
264config MARCH_Z196
265 bool "IBM zEnterprise 114 and 196"
266 select HAVE_MARCH_Z196_FEATURES
267 help
268 Select this to enable optimizations for IBM zEnterprise 114 and 196
269 (2818 and 2817 series). The kernel will be slightly faster but will
270 not work on older machines.
271
272config MARCH_ZEC12
273 bool "IBM zBC12 and zEC12"
274 select HAVE_MARCH_ZEC12_FEATURES
275 help
276 Select this to enable optimizations for IBM zBC12 and zEC12 (2828 and
277 2827 series). The kernel will be slightly faster but will not work on
278 older machines.
279
280config MARCH_Z13
281 bool "IBM z13s and z13"
282 select HAVE_MARCH_Z13_FEATURES
283 help
284 Select this to enable optimizations for IBM z13s and z13 (2965 and
285 2964 series). The kernel will be slightly faster but will not work on
286 older machines.
287
288config MARCH_Z14
289 bool "IBM z14 ZR1 and z14"
290 select HAVE_MARCH_Z14_FEATURES
291 help
292 Select this to enable optimizations for IBM z14 ZR1 and z14 (3907
293 and 3906 series). The kernel will be slightly faster but will not
294 work on older machines.
295
296endchoice
297
298config MARCH_Z900_TUNE
299 def_bool TUNE_Z900 || MARCH_Z900 && TUNE_DEFAULT
300
301config MARCH_Z990_TUNE
302 def_bool TUNE_Z990 || MARCH_Z990 && TUNE_DEFAULT
303
304config MARCH_Z9_109_TUNE
305 def_bool TUNE_Z9_109 || MARCH_Z9_109 && TUNE_DEFAULT
306
307config MARCH_Z10_TUNE
308 def_bool TUNE_Z10 || MARCH_Z10 && TUNE_DEFAULT
309
310config MARCH_Z196_TUNE
311 def_bool TUNE_Z196 || MARCH_Z196 && TUNE_DEFAULT
312
313config MARCH_ZEC12_TUNE
314 def_bool TUNE_ZEC12 || MARCH_ZEC12 && TUNE_DEFAULT
315
316config MARCH_Z13_TUNE
317 def_bool TUNE_Z13 || MARCH_Z13 && TUNE_DEFAULT
318
319config MARCH_Z14_TUNE
320 def_bool TUNE_Z14 || MARCH_Z14 && TUNE_DEFAULT
321
322choice
323 prompt "Tune code generation"
324 default TUNE_DEFAULT
325 help
326 Cause the compiler to tune (-mtune) the generated code for a machine.
327 This will make the code run faster on the selected machine but
328 somewhat slower on other machines.
329 This option only changes how the compiler emits instructions, not the
330 selection of instructions itself, so the resulting kernel will run on
331 all other machines.
332
333config TUNE_DEFAULT
334 bool "Default"
335 help
336 Tune the generated code for the target processor for which the kernel
337 will be compiled.
338
339config TUNE_Z900
340 bool "IBM zSeries model z800 and z900"
341
342config TUNE_Z990
343 bool "IBM zSeries model z890 and z990"
344
345config TUNE_Z9_109
346 bool "IBM System z9"
347
348config TUNE_Z10
349 bool "IBM System z10"
350
351config TUNE_Z196
352 bool "IBM zEnterprise 114 and 196"
353
354config TUNE_ZEC12
355 bool "IBM zBC12 and zEC12"
356
357config TUNE_Z13
358 bool "IBM z13"
359
360config TUNE_Z14
361 bool "IBM z14"
362
363endchoice
364
365config 64BIT
366 def_bool y
367
368config COMPAT
369 def_bool y
370 prompt "Kernel support for 31 bit emulation"
371 select COMPAT_BINFMT_ELF if BINFMT_ELF
372 select ARCH_WANT_OLD_COMPAT_IPC
373 select COMPAT_OLD_SIGACTION
374 depends on MULTIUSER
375 help
376 Select this option if you want to enable your system kernel to
377 handle system-calls from ELF binaries for 31 bit ESA. This option
378 (and some other stuff like libraries and such) is needed for
379 executing 31 bit applications. It is safe to say "Y".
380
381config SYSVIPC_COMPAT
382 def_bool y if COMPAT && SYSVIPC
383
384config SMP
385 def_bool y
386 prompt "Symmetric multi-processing support"
387 ---help---
388 This enables support for systems with more than one CPU. If you have
389 a system with only one CPU, like most personal computers, say N. If
390 you have a system with more than one CPU, say Y.
391
392 If you say N here, the kernel will run on uni- and multiprocessor
393 machines, but will use only one CPU of a multiprocessor machine. If
394 you say Y here, the kernel will run on many, but not all,
395 uniprocessor machines. On a uniprocessor machine, the kernel
396 will run faster if you say N here.
397
398 See also the SMP-HOWTO available at
399 <http://www.tldp.org/docs.html#howto>.
400
401 Even if you don't know what to do here, say Y.
402
403config NR_CPUS
404 int "Maximum number of CPUs (2-512)"
405 range 2 512
406 depends on SMP
407 default "64"
408 help
409 This allows you to specify the maximum number of CPUs which this
410 kernel will support. The maximum supported value is 512 and the
411 minimum value which makes sense is 2.
412
413 This is purely to save memory - each supported CPU adds
414 approximately sixteen kilobytes to the kernel image.
415
416config HOTPLUG_CPU
417 def_bool y
418 prompt "Support for hot-pluggable CPUs"
419 depends on SMP
420 help
421 Say Y here to be able to turn CPUs off and on. CPUs
422 can be controlled through /sys/devices/system/cpu/cpu#.
423 Say N if you want to disable CPU hotplug.
424
425# Some NUMA nodes have memory ranges that span
426# other nodes. Even though a pfn is valid and
427# between a node's start and end pfns, it may not
428# reside on that node. See memmap_init_zone()
429# for details. <- They meant memory holes!
430config NODES_SPAN_OTHER_NODES
431 def_bool NUMA
432
433config NUMA
434 bool "NUMA support"
435 depends on SMP && SCHED_TOPOLOGY
436 default n
437 help
438 Enable NUMA support
439
440 This option adds NUMA support to the kernel.
441
442 An operation mode can be selected by appending
443 numa=<method> to the kernel command line.
444
445 The default behaviour is identical to appending numa=plain to
446 the command line. This will create just one node with all
447 available memory and all CPUs in it.
448
449config NODES_SHIFT
450 int "Maximum NUMA nodes (as a power of 2)"
451 range 1 10
452 depends on NUMA
453 default "4"
454 help
455 Specify the maximum number of NUMA nodes available on the target
456 system. Increases memory reserved to accommodate various tables.
457
458menu "Select NUMA modes"
459 depends on NUMA
460
461config NUMA_EMU
462 bool "NUMA emulation"
463 default y
464 help
465 Numa emulation mode will split the available system memory into
466 equal chunks which then are distributed over the configured number
467 of nodes in a round-robin manner.
468
469 The number of fake nodes is limited by the number of available memory
470 chunks (i.e. memory size / fake size) and the number of supported
471 nodes in the kernel.
472
473 The CPUs are assigned to the nodes in a way that partially respects
474 the original machine topology (if supported by the machine).
475 Fair distribution of the CPUs is not guaranteed.
476
477config EMU_SIZE
478 hex "NUMA emulation memory chunk size"
479 default 0x10000000
480 range 0x400000 0x100000000
481 depends on NUMA_EMU
482 help
483 Select the default size by which the memory is chopped and then
484 assigned to emulated NUMA nodes.
485
486 This can be overridden by specifying
487
488 emu_size=<n>
489
490 on the kernel command line where also suffixes K, M, G, and T are
491 supported.
492
493endmenu
494
495config SCHED_SMT
496 def_bool n
497
498config SCHED_MC
499 def_bool n
500
501config SCHED_BOOK
502 def_bool n
503
504config SCHED_DRAWER
505 def_bool n
506
507config SCHED_TOPOLOGY
508 def_bool y
509 prompt "Topology scheduler support"
510 depends on SMP
511 select SCHED_SMT
512 select SCHED_MC
513 select SCHED_BOOK
514 select SCHED_DRAWER
515 help
516 Topology scheduler support improves the CPU scheduler's decision
517 making when dealing with machines that have multi-threading,
518 multiple cores or multiple books.
519
520source kernel/Kconfig.preempt
521
522source kernel/Kconfig.hz
523
524config KEXEC
525 def_bool y
526 select KEXEC_CORE
527
528config KEXEC_FILE
529 bool "kexec file based system call"
530 select KEXEC_CORE
531 select BUILD_BIN2C
532 depends on CRYPTO
533 depends on CRYPTO_SHA256
534 depends on CRYPTO_SHA256_S390
535 help
536 Enable the kexec file based system call. In contrast to the normal
537 kexec system call this system call takes file descriptors for the
538 kernel and initramfs as arguments.
539
540config ARCH_HAS_KEXEC_PURGATORY
541 def_bool y
542 depends on KEXEC_FILE
543
544config ARCH_RANDOM
545 def_bool y
546 prompt "s390 architectural random number generation API"
547 help
548 Enable the s390 architectural random number generation API
549 to provide random data for all consumers within the Linux
550 kernel.
551
552 When enabled the arch_random_* functions declared in linux/random.h
553 are implemented. The implementation is based on the s390 CPACF
554 instruction subfunction TRNG which provides a real true random
555 number generator.
556
557 If unsure, say Y.
558
559config KERNEL_NOBP
560 def_bool n
561 prompt "Enable modified branch prediction for the kernel by default"
562 help
563 If this option is selected the kernel will switch to a modified
564 branch prediction mode if the firmware interface is available.
565 The modified branch prediction mode improves the behaviour in
566 regard to speculative execution.
567
568 With the option enabled the kernel parameter "nobp=0" or "nospec"
569 can be used to run the kernel in the normal branch prediction mode.
570
571 With the option disabled the modified branch prediction mode is
572 enabled with the "nobp=1" kernel parameter.
573
574 If unsure, say N.
575
576config EXPOLINE
577 def_bool n
578 prompt "Avoid speculative indirect branches in the kernel"
579 help
580 Compile the kernel with the expoline compiler options to guard
581 against kernel-to-user data leaks by avoiding speculative indirect
582 branches.
583 Requires a compiler with -mindirect-branch=thunk support for full
584 protection. The kernel may run slower.
585
586 If unsure, say N.
587
588choice
589 prompt "Expoline default"
590 depends on EXPOLINE
591 default EXPOLINE_FULL
592
593config EXPOLINE_OFF
594 bool "spectre_v2=off"
595
596config EXPOLINE_AUTO
597 bool "spectre_v2=auto"
598
599config EXPOLINE_FULL
600 bool "spectre_v2=on"
601
602endchoice
603
604endmenu
605
606menu "Memory setup"
607
608config ARCH_SPARSEMEM_ENABLE
609 def_bool y
610 select SPARSEMEM_VMEMMAP_ENABLE
611 select SPARSEMEM_VMEMMAP
612
613config ARCH_SPARSEMEM_DEFAULT
614 def_bool y
615
616config ARCH_SELECT_MEMORY_MODEL
617 def_bool y
618
619config ARCH_ENABLE_MEMORY_HOTPLUG
620 def_bool y if SPARSEMEM
621
622config ARCH_ENABLE_MEMORY_HOTREMOVE
623 def_bool y
624
625config ARCH_ENABLE_SPLIT_PMD_PTLOCK
626 def_bool y
627
628config FORCE_MAX_ZONEORDER
629 int
630 default "9"
631
632source "mm/Kconfig"
633
634config MAX_PHYSMEM_BITS
635 int "Maximum size of supported physical memory in bits (42-53)"
636 range 42 53
637 default "46"
638 help
639 This option specifies the maximum supported size of physical memory
640 in bits. Supported is any size between 2^42 (4TB) and 2^53 (8PB).
641 Increasing the number of bits also increases the kernel image size.
642 By default 46 bits (64TB) are supported.
643
644config PACK_STACK
645 def_bool y
646 prompt "Pack kernel stack"
647 help
648 This option enables the compiler option -mkernel-backchain if it
649 is available. If the option is available the compiler supports
650 the new stack layout which dramatically reduces the minimum stack
651 frame size. With an old compiler a non-leaf function needs a
652 minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
653 -mkernel-backchain the minimum size drops to 16 byte on 31 bit
654 and 24 byte on 64 bit.
655
656 Say Y if you are unsure.
657
658config CHECK_STACK
659 def_bool y
660 prompt "Detect kernel stack overflow"
661 help
662 This option enables the compiler option -mstack-guard and
663 -mstack-size if they are available. If the compiler supports them
664 it will emit additional code to each function prolog to trigger
665 an illegal operation if the kernel stack is about to overflow.
666
667 Say N if you are unsure.
668
669config STACK_GUARD
670 int "Size of the guard area (128-1024)"
671 range 128 1024
672 depends on CHECK_STACK
673 default "256"
674 help
675 This allows you to specify the size of the guard area at the lower
676 end of the kernel stack. If the kernel stack points into the guard
677 area on function entry an illegal operation is triggered. The size
678 needs to be a power of 2. Please keep in mind that the size of an
679 interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
680 The minimum size for the stack guard should be 256 for 31 bit and
681 512 for 64 bit.
682
683config WARN_DYNAMIC_STACK
684 def_bool n
685 prompt "Emit compiler warnings for function with dynamic stack usage"
686 help
687 This option enables the compiler option -mwarn-dynamicstack. If the
688 compiler supports this options generates warnings for functions
689 that dynamically allocate stack space using alloca.
690
691 Say N if you are unsure.
692
693endmenu
694
695menu "I/O subsystem"
696
697config QDIO
698 def_tristate y
699 prompt "QDIO support"
700 ---help---
701 This driver provides the Queued Direct I/O base support for
702 IBM System z.
703
704 To compile this driver as a module, choose M here: the
705 module will be called qdio.
706
707 If unsure, say Y.
708
709menuconfig PCI
710 bool "PCI support"
711 select PCI_MSI
712 select IOMMU_SUPPORT
713 help
714 Enable PCI support.
715
716if PCI
717
718config PCI_NR_FUNCTIONS
719 int "Maximum number of PCI functions (1-4096)"
720 range 1 4096
721 default "128"
722 help
723 This allows you to specify the maximum number of PCI functions which
724 this kernel will support.
725
726source "drivers/pci/Kconfig"
727
728endif # PCI
729
730config PCI_DOMAINS
731 def_bool PCI
732
733config HAS_IOMEM
734 def_bool PCI
735
736config IOMMU_HELPER
737 def_bool PCI
738
739config NEED_SG_DMA_LENGTH
740 def_bool PCI
741
742config NEED_DMA_MAP_STATE
743 def_bool PCI
744
745config CHSC_SCH
746 def_tristate m
747 prompt "Support for CHSC subchannels"
748 help
749 This driver allows usage of CHSC subchannels. A CHSC subchannel
750 is usually present on LPAR only.
751 The driver creates a device /dev/chsc, which may be used to
752 obtain I/O configuration information about the machine and
753 to issue asynchronous chsc commands (DANGEROUS).
754 You will usually only want to use this interface on a special
755 LPAR designated for system management.
756
757 To compile this driver as a module, choose M here: the
758 module will be called chsc_sch.
759
760 If unsure, say N.
761
762config SCM_BUS
763 def_bool y
764 prompt "SCM bus driver"
765 help
766 Bus driver for Storage Class Memory.
767
768config EADM_SCH
769 def_tristate m
770 prompt "Support for EADM subchannels"
771 depends on SCM_BUS
772 help
773 This driver allows usage of EADM subchannels. EADM subchannels act
774 as a communication vehicle for SCM increments.
775
776 To compile this driver as a module, choose M here: the
777 module will be called eadm_sch.
778
779config VFIO_CCW
780 def_tristate n
781 prompt "Support for VFIO-CCW subchannels"
782 depends on S390_CCW_IOMMU && VFIO_MDEV
783 help
784 This driver allows usage of I/O subchannels via VFIO-CCW.
785
786 To compile this driver as a module, choose M here: the
787 module will be called vfio_ccw.
788
789endmenu
790
791menu "Dump support"
792
793config CRASH_DUMP
794 bool "kernel crash dumps"
795 depends on SMP
796 select KEXEC
797 help
798 Generate crash dump after being started by kexec.
799 Crash dump kernels are loaded in the main kernel with kexec-tools
800 into a specially reserved region and then later executed after
801 a crash by kdump/kexec.
802 Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this.
803 This option also enables s390 zfcpdump.
804 See also <file:Documentation/s390/zfcpdump.txt>
805
806endmenu
807
808menu "Executable file formats / Emulations"
809
810source "fs/Kconfig.binfmt"
811
812config SECCOMP
813 def_bool y
814 prompt "Enable seccomp to safely compute untrusted bytecode"
815 depends on PROC_FS
816 help
817 This kernel feature is useful for number crunching applications
818 that may need to compute untrusted bytecode during their
819 execution. By using pipes or other transports made available to
820 the process as file descriptors supporting the read/write
821 syscalls, it's possible to isolate those applications in
822 their own address space using seccomp. Once seccomp is
823 enabled via /proc/<pid>/seccomp, it cannot be disabled
824 and the task is only allowed to execute a few safe syscalls
825 defined by each seccomp mode.
826
827 If unsure, say Y.
828
829endmenu
830
831menu "Power Management"
832
833config ARCH_HIBERNATION_POSSIBLE
834 def_bool y
835
836source "kernel/power/Kconfig"
837
838endmenu
839
840source "net/Kconfig"
841
842config PCMCIA
843 def_bool n
844
845config CCW
846 def_bool y
847
848source "drivers/Kconfig"
849
850source "fs/Kconfig"
851
852source "arch/s390/Kconfig.debug"
853
854source "security/Kconfig"
855
856source "crypto/Kconfig"
857
858source "lib/Kconfig"
859
860menu "Virtualization"
861
862config PFAULT
863 def_bool y
864 prompt "Pseudo page fault support"
865 help
866 Select this option, if you want to use PFAULT pseudo page fault
867 handling under VM. If running native or in LPAR, this option
868 has no effect. If your VM does not support PFAULT, PAGEEX
869 pseudo page fault handling will be used.
870 Note that VM 4.2 supports PFAULT but has a bug in its
871 implementation that causes some problems.
872 Everybody who wants to run Linux under VM != VM4.2 should select
873 this option.
874
875config CMM
876 def_tristate n
877 prompt "Cooperative memory management"
878 help
879 Select this option, if you want to enable the kernel interface
880 to reduce the memory size of the system. This is accomplished
881 by allocating pages of memory and put them "on hold". This only
882 makes sense for a system running under VM where the unused pages
883 will be reused by VM for other guest systems. The interface
884 allows an external monitor to balance memory of many systems.
885 Everybody who wants to run Linux under VM should select this
886 option.
887
888config CMM_IUCV
889 def_bool y
890 prompt "IUCV special message interface to cooperative memory management"
891 depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
892 help
893 Select this option to enable the special message interface to
894 the cooperative memory management.
895
896config APPLDATA_BASE
897 def_bool n
898 prompt "Linux - VM Monitor Stream, base infrastructure"
899 depends on PROC_FS
900 help
901 This provides a kernel interface for creating and updating z/VM APPLDATA
902 monitor records. The monitor records are updated at certain time
903 intervals, once the timer is started.
904 Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
905 i.e. enables or disables monitoring on the Linux side.
906 A custom interval value (in seconds) can be written to
907 /proc/appldata/interval.
908
909 Defaults are 60 seconds interval and timer off.
910 The /proc entries can also be read from, showing the current settings.
911
912config APPLDATA_MEM
913 def_tristate m
914 prompt "Monitor memory management statistics"
915 depends on APPLDATA_BASE && VM_EVENT_COUNTERS
916 help
917 This provides memory management related data to the Linux - VM Monitor
918 Stream, like paging/swapping rate, memory utilisation, etc.
919 Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
920 APPLDATA monitor record, i.e. enables or disables monitoring this record
921 on the z/VM side.
922
923 Default is disabled.
924 The /proc entry can also be read from, showing the current settings.
925
926 This can also be compiled as a module, which will be called
927 appldata_mem.o.
928
929config APPLDATA_OS
930 def_tristate m
931 prompt "Monitor OS statistics"
932 depends on APPLDATA_BASE
933 help
934 This provides OS related data to the Linux - VM Monitor Stream, like
935 CPU utilisation, etc.
936 Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
937 APPLDATA monitor record, i.e. enables or disables monitoring this record
938 on the z/VM side.
939
940 Default is disabled.
941 This can also be compiled as a module, which will be called
942 appldata_os.o.
943
944config APPLDATA_NET_SUM
945 def_tristate m
946 prompt "Monitor overall network statistics"
947 depends on APPLDATA_BASE && NET
948 help
949 This provides network related data to the Linux - VM Monitor Stream,
950 currently there is only a total sum of network I/O statistics, no
951 per-interface data.
952 Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
953 APPLDATA monitor record, i.e. enables or disables monitoring this record
954 on the z/VM side.
955
956 Default is disabled.
957 This can also be compiled as a module, which will be called
958 appldata_net_sum.o.
959
960config S390_HYPFS_FS
961 def_bool y
962 prompt "s390 hypervisor file system support"
963 select SYS_HYPERVISOR
964 help
965 This is a virtual file system intended to provide accounting
966 information in an s390 hypervisor environment.
967
968source "arch/s390/kvm/Kconfig"
969
970config S390_GUEST
971 def_bool y
972 prompt "s390 support for virtio devices"
973 select TTY
974 select VIRTUALIZATION
975 select VIRTIO
976 select VIRTIO_CONSOLE
977 help
978 Enabling this option adds support for virtio based paravirtual device
979 drivers on s390.
980
981 Select this option if you want to run the kernel as a guest under
982 the KVM hypervisor.
983
984endmenu