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1# SPDX-License-Identifier: GPL-2.0
2config MMU
3 def_bool y
4
5config CPU_BIG_ENDIAN
6 def_bool y
7
8config LOCKDEP_SUPPORT
9 def_bool y
10
11config STACKTRACE_SUPPORT
12 def_bool y
13
14config ARCH_HAS_ILOG2_U32
15 def_bool n
16
17config ARCH_HAS_ILOG2_U64
18 def_bool n
19
20config GENERIC_HWEIGHT
21 def_bool y
22
23config GENERIC_BUG
24 def_bool y if BUG
25
26config GENERIC_BUG_RELATIVE_POINTERS
27 def_bool y
28
29config GENERIC_LOCKBREAK
30 def_bool y if PREEMPTION
31
32config PGSTE
33 def_bool y if KVM
34
35config AUDIT_ARCH
36 def_bool y
37
38config NO_IOPORT_MAP
39 def_bool y
40
41config PCI_QUIRKS
42 def_bool n
43
44config ARCH_SUPPORTS_UPROBES
45 def_bool y
46
47config KASAN_SHADOW_OFFSET
48 hex
49 depends on KASAN
50 default 0x1C000000000000
51
52config S390
53 def_bool y
54 #
55 # Note: keep this list sorted alphabetically
56 #
57 imply IMA_SECURE_AND_OR_TRUSTED_BOOT
58 select ALTERNATE_USER_ADDRESS_SPACE
59 select ARCH_32BIT_USTAT_F_TINODE
60 select ARCH_BINFMT_ELF_STATE
61 select ARCH_CORRECT_STACKTRACE_ON_KRETPROBE
62 select ARCH_ENABLE_MEMORY_HOTPLUG if SPARSEMEM
63 select ARCH_ENABLE_MEMORY_HOTREMOVE
64 select ARCH_ENABLE_SPLIT_PMD_PTLOCK if PGTABLE_LEVELS > 2
65 select ARCH_HAS_CURRENT_STACK_POINTER
66 select ARCH_HAS_DEBUG_VM_PGTABLE
67 select ARCH_HAS_DEBUG_WX
68 select ARCH_HAS_DEVMEM_IS_ALLOWED
69 select ARCH_HAS_ELF_RANDOMIZE
70 select ARCH_HAS_FORCE_DMA_UNENCRYPTED
71 select ARCH_HAS_FORTIFY_SOURCE
72 select ARCH_HAS_GCOV_PROFILE_ALL
73 select ARCH_HAS_GIGANTIC_PAGE
74 select ARCH_HAS_KCOV
75 select ARCH_HAS_MEMBARRIER_SYNC_CORE
76 select ARCH_HAS_MEM_ENCRYPT
77 select ARCH_HAS_NMI_SAFE_THIS_CPU_OPS
78 select ARCH_HAS_PTE_SPECIAL
79 select ARCH_HAS_SCALED_CPUTIME
80 select ARCH_HAS_SET_DIRECT_MAP
81 select ARCH_HAS_SET_MEMORY
82 select ARCH_HAS_STRICT_KERNEL_RWX
83 select ARCH_HAS_STRICT_MODULE_RWX
84 select ARCH_HAS_SYSCALL_WRAPPER
85 select ARCH_HAS_UBSAN_SANITIZE_ALL
86 select ARCH_HAS_VDSO_DATA
87 select ARCH_HAVE_NMI_SAFE_CMPXCHG
88 select ARCH_INLINE_READ_LOCK
89 select ARCH_INLINE_READ_LOCK_BH
90 select ARCH_INLINE_READ_LOCK_IRQ
91 select ARCH_INLINE_READ_LOCK_IRQSAVE
92 select ARCH_INLINE_READ_TRYLOCK
93 select ARCH_INLINE_READ_UNLOCK
94 select ARCH_INLINE_READ_UNLOCK_BH
95 select ARCH_INLINE_READ_UNLOCK_IRQ
96 select ARCH_INLINE_READ_UNLOCK_IRQRESTORE
97 select ARCH_INLINE_SPIN_LOCK
98 select ARCH_INLINE_SPIN_LOCK_BH
99 select ARCH_INLINE_SPIN_LOCK_IRQ
100 select ARCH_INLINE_SPIN_LOCK_IRQSAVE
101 select ARCH_INLINE_SPIN_TRYLOCK
102 select ARCH_INLINE_SPIN_TRYLOCK_BH
103 select ARCH_INLINE_SPIN_UNLOCK
104 select ARCH_INLINE_SPIN_UNLOCK_BH
105 select ARCH_INLINE_SPIN_UNLOCK_IRQ
106 select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE
107 select ARCH_INLINE_WRITE_LOCK
108 select ARCH_INLINE_WRITE_LOCK_BH
109 select ARCH_INLINE_WRITE_LOCK_IRQ
110 select ARCH_INLINE_WRITE_LOCK_IRQSAVE
111 select ARCH_INLINE_WRITE_TRYLOCK
112 select ARCH_INLINE_WRITE_UNLOCK
113 select ARCH_INLINE_WRITE_UNLOCK_BH
114 select ARCH_INLINE_WRITE_UNLOCK_IRQ
115 select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE
116 select ARCH_STACKWALK
117 select ARCH_SUPPORTS_ATOMIC_RMW
118 select ARCH_SUPPORTS_DEBUG_PAGEALLOC
119 select ARCH_SUPPORTS_HUGETLBFS
120 select ARCH_SUPPORTS_INT128 if CC_HAS_INT128 && CC_IS_CLANG
121 select ARCH_SUPPORTS_NUMA_BALANCING
122 select ARCH_SUPPORTS_PER_VMA_LOCK
123 select ARCH_USE_BUILTIN_BSWAP
124 select ARCH_USE_CMPXCHG_LOCKREF
125 select ARCH_USE_SYM_ANNOTATIONS
126 select ARCH_WANTS_NO_INSTR
127 select ARCH_WANT_DEFAULT_BPF_JIT
128 select ARCH_WANT_IPC_PARSE_VERSION
129 select ARCH_WANT_KERNEL_PMD_MKWRITE
130 select ARCH_WANT_OPTIMIZE_HUGETLB_VMEMMAP
131 select BUILDTIME_TABLE_SORT
132 select CLONE_BACKWARDS2
133 select DCACHE_WORD_ACCESS if !KMSAN
134 select DMA_OPS if PCI
135 select DYNAMIC_FTRACE if FUNCTION_TRACER
136 select FUNCTION_ALIGNMENT_8B if CC_IS_GCC
137 select FUNCTION_ALIGNMENT_16B if !CC_IS_GCC
138 select GENERIC_ALLOCATOR
139 select GENERIC_CPU_AUTOPROBE
140 select GENERIC_CPU_VULNERABILITIES
141 select GENERIC_ENTRY
142 select GENERIC_GETTIMEOFDAY
143 select GENERIC_PTDUMP
144 select GENERIC_SMP_IDLE_THREAD
145 select GENERIC_TIME_VSYSCALL
146 select GENERIC_VDSO_TIME_NS
147 select GENERIC_IOREMAP if PCI
148 select HAVE_ALIGNED_STRUCT_PAGE
149 select HAVE_ARCH_AUDITSYSCALL
150 select HAVE_ARCH_JUMP_LABEL
151 select HAVE_ARCH_JUMP_LABEL_RELATIVE
152 select HAVE_ARCH_KASAN
153 select HAVE_ARCH_KASAN_VMALLOC
154 select HAVE_ARCH_KCSAN
155 select HAVE_ARCH_KFENCE
156 select HAVE_ARCH_RANDOMIZE_KSTACK_OFFSET
157 select HAVE_ARCH_SECCOMP_FILTER
158 select HAVE_ARCH_SOFT_DIRTY
159 select HAVE_ARCH_STACKLEAK
160 select HAVE_ARCH_TRACEHOOK
161 select HAVE_ARCH_TRANSPARENT_HUGEPAGE
162 select HAVE_ARCH_VMAP_STACK
163 select HAVE_ASM_MODVERSIONS
164 select HAVE_CMPXCHG_DOUBLE
165 select HAVE_CMPXCHG_LOCAL
166 select HAVE_DEBUG_KMEMLEAK
167 select HAVE_DMA_CONTIGUOUS
168 select HAVE_DYNAMIC_FTRACE
169 select HAVE_DYNAMIC_FTRACE_WITH_ARGS
170 select HAVE_DYNAMIC_FTRACE_WITH_DIRECT_CALLS
171 select HAVE_DYNAMIC_FTRACE_WITH_REGS
172 select HAVE_EBPF_JIT if HAVE_MARCH_Z196_FEATURES
173 select HAVE_EFFICIENT_UNALIGNED_ACCESS
174 select HAVE_FAST_GUP
175 select HAVE_FENTRY
176 select HAVE_FTRACE_MCOUNT_RECORD
177 select HAVE_FUNCTION_ARG_ACCESS_API
178 select HAVE_FUNCTION_ERROR_INJECTION
179 select HAVE_FUNCTION_GRAPH_RETVAL
180 select HAVE_FUNCTION_GRAPH_TRACER
181 select HAVE_FUNCTION_TRACER
182 select HAVE_GCC_PLUGINS
183 select HAVE_GENERIC_VDSO
184 select HAVE_IOREMAP_PROT if PCI
185 select HAVE_KERNEL_BZIP2
186 select HAVE_KERNEL_GZIP
187 select HAVE_KERNEL_LZ4
188 select HAVE_KERNEL_LZMA
189 select HAVE_KERNEL_LZO
190 select HAVE_KERNEL_UNCOMPRESSED
191 select HAVE_KERNEL_XZ
192 select HAVE_KERNEL_ZSTD
193 select HAVE_KPROBES
194 select HAVE_KPROBES_ON_FTRACE
195 select HAVE_KRETPROBES
196 select HAVE_KVM
197 select HAVE_LIVEPATCH
198 select HAVE_MEMBLOCK_PHYS_MAP
199 select HAVE_MOD_ARCH_SPECIFIC
200 select HAVE_NMI
201 select HAVE_NOP_MCOUNT
202 select HAVE_PCI
203 select HAVE_PERF_EVENTS
204 select HAVE_PERF_REGS
205 select HAVE_PERF_USER_STACK_DUMP
206 select HAVE_REGS_AND_STACK_ACCESS_API
207 select HAVE_RELIABLE_STACKTRACE
208 select HAVE_RETHOOK
209 select HAVE_RSEQ
210 select HAVE_SAMPLE_FTRACE_DIRECT
211 select HAVE_SAMPLE_FTRACE_DIRECT_MULTI
212 select HAVE_SETUP_PER_CPU_AREA
213 select HAVE_SOFTIRQ_ON_OWN_STACK
214 select HAVE_SYSCALL_TRACEPOINTS
215 select HAVE_VIRT_CPU_ACCOUNTING
216 select HAVE_VIRT_CPU_ACCOUNTING_IDLE
217 select IOMMU_HELPER if PCI
218 select IOMMU_SUPPORT if PCI
219 select MMU_GATHER_MERGE_VMAS
220 select MMU_GATHER_NO_GATHER
221 select MMU_GATHER_RCU_TABLE_FREE
222 select MODULES_USE_ELF_RELA
223 select NEED_DMA_MAP_STATE if PCI
224 select NEED_PER_CPU_EMBED_FIRST_CHUNK
225 select NEED_SG_DMA_LENGTH if PCI
226 select OLD_SIGACTION
227 select OLD_SIGSUSPEND3
228 select PCI_DOMAINS if PCI
229 select PCI_MSI if PCI
230 select PCI_MSI_ARCH_FALLBACKS if PCI_MSI
231 select SPARSE_IRQ
232 select SWIOTLB
233 select SYSCTL_EXCEPTION_TRACE
234 select THREAD_INFO_IN_TASK
235 select TRACE_IRQFLAGS_SUPPORT
236 select TTY
237 select USER_STACKTRACE_SUPPORT
238 select VIRT_CPU_ACCOUNTING
239 select ZONE_DMA
240 # Note: keep the above list sorted alphabetically
241
242config SCHED_OMIT_FRAME_POINTER
243 def_bool y
244
245config PGTABLE_LEVELS
246 int
247 default 5
248
249source "kernel/livepatch/Kconfig"
250
251config ARCH_SUPPORTS_KEXEC
252 def_bool y
253
254config ARCH_SUPPORTS_KEXEC_FILE
255 def_bool y
256
257config ARCH_SUPPORTS_KEXEC_SIG
258 def_bool MODULE_SIG_FORMAT
259
260config ARCH_SUPPORTS_KEXEC_PURGATORY
261 def_bool y
262
263config ARCH_SUPPORTS_CRASH_DUMP
264 def_bool y
265 help
266 Refer to <file:Documentation/arch/s390/zfcpdump.rst> for more details on this.
267 This option also enables s390 zfcpdump.
268 See also <file:Documentation/arch/s390/zfcpdump.rst>
269
270menu "Processor type and features"
271
272config HAVE_MARCH_Z10_FEATURES
273 def_bool n
274
275config HAVE_MARCH_Z196_FEATURES
276 def_bool n
277 select HAVE_MARCH_Z10_FEATURES
278
279config HAVE_MARCH_ZEC12_FEATURES
280 def_bool n
281 select HAVE_MARCH_Z196_FEATURES
282
283config HAVE_MARCH_Z13_FEATURES
284 def_bool n
285 select HAVE_MARCH_ZEC12_FEATURES
286
287config HAVE_MARCH_Z14_FEATURES
288 def_bool n
289 select HAVE_MARCH_Z13_FEATURES
290
291config HAVE_MARCH_Z15_FEATURES
292 def_bool n
293 select HAVE_MARCH_Z14_FEATURES
294
295config HAVE_MARCH_Z16_FEATURES
296 def_bool n
297 select HAVE_MARCH_Z15_FEATURES
298
299choice
300 prompt "Processor type"
301 default MARCH_Z196
302
303config MARCH_Z10
304 bool "IBM System z10"
305 select HAVE_MARCH_Z10_FEATURES
306 depends on $(cc-option,-march=z10)
307 help
308 Select this to enable optimizations for IBM System z10 (2097 and 2098
309 series). This is the oldest machine generation currently supported.
310
311config MARCH_Z196
312 bool "IBM zEnterprise 114 and 196"
313 select HAVE_MARCH_Z196_FEATURES
314 depends on $(cc-option,-march=z196)
315 help
316 Select this to enable optimizations for IBM zEnterprise 114 and 196
317 (2818 and 2817 series). The kernel will be slightly faster but will
318 not work on older machines.
319
320config MARCH_ZEC12
321 bool "IBM zBC12 and zEC12"
322 select HAVE_MARCH_ZEC12_FEATURES
323 depends on $(cc-option,-march=zEC12)
324 help
325 Select this to enable optimizations for IBM zBC12 and zEC12 (2828 and
326 2827 series). The kernel will be slightly faster but will not work on
327 older machines.
328
329config MARCH_Z13
330 bool "IBM z13s and z13"
331 select HAVE_MARCH_Z13_FEATURES
332 depends on $(cc-option,-march=z13)
333 help
334 Select this to enable optimizations for IBM z13s and z13 (2965 and
335 2964 series). The kernel will be slightly faster but will not work on
336 older machines.
337
338config MARCH_Z14
339 bool "IBM z14 ZR1 and z14"
340 select HAVE_MARCH_Z14_FEATURES
341 depends on $(cc-option,-march=z14)
342 help
343 Select this to enable optimizations for IBM z14 ZR1 and z14 (3907
344 and 3906 series). The kernel will be slightly faster but will not
345 work on older machines.
346
347config MARCH_Z15
348 bool "IBM z15"
349 select HAVE_MARCH_Z15_FEATURES
350 depends on $(cc-option,-march=z15)
351 help
352 Select this to enable optimizations for IBM z15 (8562
353 and 8561 series). The kernel will be slightly faster but will not
354 work on older machines.
355
356config MARCH_Z16
357 bool "IBM z16"
358 select HAVE_MARCH_Z16_FEATURES
359 depends on $(cc-option,-march=z16)
360 help
361 Select this to enable optimizations for IBM z16 (3931 and
362 3932 series).
363
364endchoice
365
366config MARCH_Z10_TUNE
367 def_bool TUNE_Z10 || MARCH_Z10 && TUNE_DEFAULT
368
369config MARCH_Z196_TUNE
370 def_bool TUNE_Z196 || MARCH_Z196 && TUNE_DEFAULT
371
372config MARCH_ZEC12_TUNE
373 def_bool TUNE_ZEC12 || MARCH_ZEC12 && TUNE_DEFAULT
374
375config MARCH_Z13_TUNE
376 def_bool TUNE_Z13 || MARCH_Z13 && TUNE_DEFAULT
377
378config MARCH_Z14_TUNE
379 def_bool TUNE_Z14 || MARCH_Z14 && TUNE_DEFAULT
380
381config MARCH_Z15_TUNE
382 def_bool TUNE_Z15 || MARCH_Z15 && TUNE_DEFAULT
383
384config MARCH_Z16_TUNE
385 def_bool TUNE_Z16 || MARCH_Z16 && TUNE_DEFAULT
386
387choice
388 prompt "Tune code generation"
389 default TUNE_DEFAULT
390 help
391 Cause the compiler to tune (-mtune) the generated code for a machine.
392 This will make the code run faster on the selected machine but
393 somewhat slower on other machines.
394 This option only changes how the compiler emits instructions, not the
395 selection of instructions itself, so the resulting kernel will run on
396 all other machines.
397
398config TUNE_DEFAULT
399 bool "Default"
400 help
401 Tune the generated code for the target processor for which the kernel
402 will be compiled.
403
404config TUNE_Z10
405 bool "IBM System z10"
406
407config TUNE_Z196
408 bool "IBM zEnterprise 114 and 196"
409 depends on $(cc-option,-mtune=z196)
410
411config TUNE_ZEC12
412 bool "IBM zBC12 and zEC12"
413 depends on $(cc-option,-mtune=zEC12)
414
415config TUNE_Z13
416 bool "IBM z13s and z13"
417 depends on $(cc-option,-mtune=z13)
418
419config TUNE_Z14
420 bool "IBM z14 ZR1 and z14"
421 depends on $(cc-option,-mtune=z14)
422
423config TUNE_Z15
424 bool "IBM z15"
425 depends on $(cc-option,-mtune=z15)
426
427config TUNE_Z16
428 bool "IBM z16"
429 depends on $(cc-option,-mtune=z16)
430
431endchoice
432
433config 64BIT
434 def_bool y
435
436config COMMAND_LINE_SIZE
437 int "Maximum size of kernel command line"
438 default 4096
439 range 896 1048576
440 help
441 This allows you to specify the maximum length of the kernel command
442 line.
443
444config COMPAT
445 def_bool n
446 prompt "Kernel support for 31 bit emulation"
447 select ARCH_WANT_OLD_COMPAT_IPC
448 select COMPAT_OLD_SIGACTION
449 select HAVE_UID16
450 depends on MULTIUSER
451 depends on !CC_IS_CLANG
452 help
453 Select this option if you want to enable your system kernel to
454 handle system-calls from ELF binaries for 31 bit ESA. This option
455 (and some other stuff like libraries and such) is needed for
456 executing 31 bit applications.
457
458 If unsure say N.
459
460config SMP
461 def_bool y
462
463config NR_CPUS
464 int "Maximum number of CPUs (2-512)"
465 range 2 512
466 default "64"
467 help
468 This allows you to specify the maximum number of CPUs which this
469 kernel will support. The maximum supported value is 512 and the
470 minimum value which makes sense is 2.
471
472 This is purely to save memory - each supported CPU adds
473 approximately sixteen kilobytes to the kernel image.
474
475config HOTPLUG_CPU
476 def_bool y
477
478config NUMA
479 bool "NUMA support"
480 depends on SCHED_TOPOLOGY
481 default n
482 help
483 Enable NUMA support
484
485 This option adds NUMA support to the kernel.
486
487config NODES_SHIFT
488 int
489 depends on NUMA
490 default "1"
491
492config SCHED_SMT
493 def_bool n
494
495config SCHED_MC
496 def_bool n
497
498config SCHED_TOPOLOGY
499 def_bool y
500 prompt "Topology scheduler support"
501 select SCHED_SMT
502 select SCHED_MC
503 help
504 Topology scheduler support improves the CPU scheduler's decision
505 making when dealing with machines that have multi-threading,
506 multiple cores or multiple books.
507
508source "kernel/Kconfig.hz"
509
510config CERT_STORE
511 bool "Get user certificates via DIAG320"
512 depends on KEYS
513 select CRYPTO_LIB_SHA256
514 help
515 Enable this option if you want to access user-provided secure boot
516 certificates via DIAG 0x320.
517
518 These certificates will be made available via the keyring named
519 'cert_store'.
520
521config KERNEL_NOBP
522 def_bool n
523 prompt "Enable modified branch prediction for the kernel by default"
524 help
525 If this option is selected the kernel will switch to a modified
526 branch prediction mode if the firmware interface is available.
527 The modified branch prediction mode improves the behaviour in
528 regard to speculative execution.
529
530 With the option enabled the kernel parameter "nobp=0" or "nospec"
531 can be used to run the kernel in the normal branch prediction mode.
532
533 With the option disabled the modified branch prediction mode is
534 enabled with the "nobp=1" kernel parameter.
535
536 If unsure, say N.
537
538config EXPOLINE
539 def_bool n
540 depends on $(cc-option,-mindirect-branch=thunk)
541 prompt "Avoid speculative indirect branches in the kernel"
542 help
543 Compile the kernel with the expoline compiler options to guard
544 against kernel-to-user data leaks by avoiding speculative indirect
545 branches.
546 Requires a compiler with -mindirect-branch=thunk support for full
547 protection. The kernel may run slower.
548
549 If unsure, say N.
550
551config EXPOLINE_EXTERN
552 def_bool n
553 depends on EXPOLINE
554 depends on CC_IS_GCC && GCC_VERSION >= 110200
555 depends on $(success,$(srctree)/arch/s390/tools/gcc-thunk-extern.sh $(CC))
556 prompt "Generate expolines as extern functions."
557 help
558 This option is required for some tooling like kpatch. The kernel is
559 compiled with -mindirect-branch=thunk-extern and requires a newer
560 compiler.
561
562 If unsure, say N.
563
564choice
565 prompt "Expoline default"
566 depends on EXPOLINE
567 default EXPOLINE_FULL
568
569config EXPOLINE_OFF
570 bool "spectre_v2=off"
571
572config EXPOLINE_AUTO
573 bool "spectre_v2=auto"
574
575config EXPOLINE_FULL
576 bool "spectre_v2=on"
577
578endchoice
579
580config RELOCATABLE
581 def_bool y
582 help
583 This builds a kernel image that retains relocation information
584 so it can be loaded at an arbitrary address.
585 The kernel is linked as a position-independent executable (PIE)
586 and contains dynamic relocations which are processed early in the
587 bootup process.
588 The relocations make the kernel image about 15% larger (compressed
589 10%), but are discarded at runtime.
590 Note: this option exists only for documentation purposes, please do
591 not remove it.
592
593config RANDOMIZE_BASE
594 bool "Randomize the address of the kernel image (KASLR)"
595 default y
596 help
597 In support of Kernel Address Space Layout Randomization (KASLR),
598 this randomizes the address at which the kernel image is loaded,
599 as a security feature that deters exploit attempts relying on
600 knowledge of the location of kernel internals.
601
602endmenu
603
604menu "Memory setup"
605
606config ARCH_SPARSEMEM_ENABLE
607 def_bool y
608 select SPARSEMEM_VMEMMAP_ENABLE
609 select SPARSEMEM_VMEMMAP
610
611config ARCH_SPARSEMEM_DEFAULT
612 def_bool y
613
614config MAX_PHYSMEM_BITS
615 int "Maximum size of supported physical memory in bits (42-53)"
616 range 42 53
617 default "46"
618 help
619 This option specifies the maximum supported size of physical memory
620 in bits. Supported is any size between 2^42 (4TB) and 2^53 (8PB).
621 Increasing the number of bits also increases the kernel image size.
622 By default 46 bits (64TB) are supported.
623
624config CHECK_STACK
625 def_bool y
626 depends on !VMAP_STACK
627 prompt "Detect kernel stack overflow"
628 help
629 This option enables the compiler option -mstack-guard and
630 -mstack-size if they are available. If the compiler supports them
631 it will emit additional code to each function prolog to trigger
632 an illegal operation if the kernel stack is about to overflow.
633
634 Say N if you are unsure.
635
636config STACK_GUARD
637 int "Size of the guard area (128-1024)"
638 range 128 1024
639 depends on CHECK_STACK
640 default "256"
641 help
642 This allows you to specify the size of the guard area at the lower
643 end of the kernel stack. If the kernel stack points into the guard
644 area on function entry an illegal operation is triggered. The size
645 needs to be a power of 2. Please keep in mind that the size of an
646 interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
647 The minimum size for the stack guard should be 256 for 31 bit and
648 512 for 64 bit.
649
650endmenu
651
652menu "I/O subsystem"
653
654config QDIO
655 def_tristate y
656 prompt "QDIO support"
657 help
658 This driver provides the Queued Direct I/O base support for
659 IBM System z.
660
661 To compile this driver as a module, choose M here: the
662 module will be called qdio.
663
664 If unsure, say Y.
665
666if PCI
667
668config PCI_NR_FUNCTIONS
669 int "Maximum number of PCI functions (1-4096)"
670 range 1 4096
671 default "512"
672 help
673 This allows you to specify the maximum number of PCI functions which
674 this kernel will support.
675
676endif # PCI
677
678config HAS_IOMEM
679 def_bool PCI
680
681config CHSC_SCH
682 def_tristate m
683 prompt "Support for CHSC subchannels"
684 help
685 This driver allows usage of CHSC subchannels. A CHSC subchannel
686 is usually present on LPAR only.
687 The driver creates a device /dev/chsc, which may be used to
688 obtain I/O configuration information about the machine and
689 to issue asynchronous chsc commands (DANGEROUS).
690 You will usually only want to use this interface on a special
691 LPAR designated for system management.
692
693 To compile this driver as a module, choose M here: the
694 module will be called chsc_sch.
695
696 If unsure, say N.
697
698config SCM_BUS
699 def_bool y
700 prompt "SCM bus driver"
701 help
702 Bus driver for Storage Class Memory.
703
704config EADM_SCH
705 def_tristate m
706 prompt "Support for EADM subchannels"
707 depends on SCM_BUS
708 help
709 This driver allows usage of EADM subchannels. EADM subchannels act
710 as a communication vehicle for SCM increments.
711
712 To compile this driver as a module, choose M here: the
713 module will be called eadm_sch.
714
715config VFIO_CCW
716 def_tristate n
717 prompt "Support for VFIO-CCW subchannels"
718 depends on VFIO
719 select VFIO_MDEV
720 help
721 This driver allows usage of I/O subchannels via VFIO-CCW.
722
723 To compile this driver as a module, choose M here: the
724 module will be called vfio_ccw.
725
726config VFIO_AP
727 def_tristate n
728 prompt "VFIO support for AP devices"
729 depends on KVM
730 depends on VFIO
731 depends on ZCRYPT
732 select VFIO_MDEV
733 help
734 This driver grants access to Adjunct Processor (AP) devices
735 via the VFIO mediated device interface.
736
737 To compile this driver as a module, choose M here: the module
738 will be called vfio_ap.
739
740endmenu
741
742config CCW
743 def_bool y
744
745config HAVE_PNETID
746 tristate
747 default (SMC || CCWGROUP)
748
749menu "Virtualization"
750
751config PROTECTED_VIRTUALIZATION_GUEST
752 def_bool n
753 prompt "Protected virtualization guest support"
754 help
755 Select this option, if you want to be able to run this
756 kernel as a protected virtualization KVM guest.
757 Protected virtualization capable machines have a mini hypervisor
758 located at machine level (an ultravisor). With help of the
759 Ultravisor, KVM will be able to run "protected" VMs, special
760 VMs whose memory and management data are unavailable to KVM.
761
762config PFAULT
763 def_bool y
764 prompt "Pseudo page fault support"
765 help
766 Select this option, if you want to use PFAULT pseudo page fault
767 handling under VM. If running native or in LPAR, this option
768 has no effect. If your VM does not support PFAULT, PAGEEX
769 pseudo page fault handling will be used.
770 Note that VM 4.2 supports PFAULT but has a bug in its
771 implementation that causes some problems.
772 Everybody who wants to run Linux under VM != VM4.2 should select
773 this option.
774
775config CMM
776 def_tristate n
777 prompt "Cooperative memory management"
778 help
779 Select this option, if you want to enable the kernel interface
780 to reduce the memory size of the system. This is accomplished
781 by allocating pages of memory and put them "on hold". This only
782 makes sense for a system running under VM where the unused pages
783 will be reused by VM for other guest systems. The interface
784 allows an external monitor to balance memory of many systems.
785 Everybody who wants to run Linux under VM should select this
786 option.
787
788config CMM_IUCV
789 def_bool y
790 prompt "IUCV special message interface to cooperative memory management"
791 depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
792 help
793 Select this option to enable the special message interface to
794 the cooperative memory management.
795
796config APPLDATA_BASE
797 def_bool n
798 prompt "Linux - VM Monitor Stream, base infrastructure"
799 depends on PROC_SYSCTL
800 help
801 This provides a kernel interface for creating and updating z/VM APPLDATA
802 monitor records. The monitor records are updated at certain time
803 intervals, once the timer is started.
804 Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
805 i.e. enables or disables monitoring on the Linux side.
806 A custom interval value (in seconds) can be written to
807 /proc/appldata/interval.
808
809 Defaults are 60 seconds interval and timer off.
810 The /proc entries can also be read from, showing the current settings.
811
812config APPLDATA_MEM
813 def_tristate m
814 prompt "Monitor memory management statistics"
815 depends on APPLDATA_BASE && VM_EVENT_COUNTERS
816 help
817 This provides memory management related data to the Linux - VM Monitor
818 Stream, like paging/swapping rate, memory utilisation, etc.
819 Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
820 APPLDATA monitor record, i.e. enables or disables monitoring this record
821 on the z/VM side.
822
823 Default is disabled.
824 The /proc entry can also be read from, showing the current settings.
825
826 This can also be compiled as a module, which will be called
827 appldata_mem.o.
828
829config APPLDATA_OS
830 def_tristate m
831 prompt "Monitor OS statistics"
832 depends on APPLDATA_BASE
833 help
834 This provides OS related data to the Linux - VM Monitor Stream, like
835 CPU utilisation, etc.
836 Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
837 APPLDATA monitor record, i.e. enables or disables monitoring this record
838 on the z/VM side.
839
840 Default is disabled.
841 This can also be compiled as a module, which will be called
842 appldata_os.o.
843
844config APPLDATA_NET_SUM
845 def_tristate m
846 prompt "Monitor overall network statistics"
847 depends on APPLDATA_BASE && NET
848 help
849 This provides network related data to the Linux - VM Monitor Stream,
850 currently there is only a total sum of network I/O statistics, no
851 per-interface data.
852 Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
853 APPLDATA monitor record, i.e. enables or disables monitoring this record
854 on the z/VM side.
855
856 Default is disabled.
857 This can also be compiled as a module, which will be called
858 appldata_net_sum.o.
859
860config S390_HYPFS
861 def_bool y
862 prompt "s390 hypervisor information"
863 help
864 This provides several binary files at (debugfs)/s390_hypfs/ to
865 provide accounting information in an s390 hypervisor environment.
866
867config S390_HYPFS_FS
868 def_bool n
869 prompt "s390 hypervisor file system support"
870 select SYS_HYPERVISOR
871 depends on S390_HYPFS
872 help
873 This is a virtual file system intended to provide accounting
874 information in an s390 hypervisor environment. This file system
875 is deprecated and should not be used.
876
877 Say N if you are unsure.
878
879source "arch/s390/kvm/Kconfig"
880
881config S390_GUEST
882 def_bool y
883 prompt "s390 support for virtio devices"
884 select TTY
885 select VIRTUALIZATION
886 select VIRTIO
887 help
888 Enabling this option adds support for virtio based paravirtual device
889 drivers on s390.
890
891 Select this option if you want to run the kernel as a guest under
892 the KVM hypervisor.
893
894endmenu
895
896config S390_MODULES_SANITY_TEST_HELPERS
897 def_bool n
898
899menu "Selftests"
900
901config S390_UNWIND_SELFTEST
902 def_tristate n
903 depends on KUNIT
904 default KUNIT_ALL_TESTS
905 prompt "Test unwind functions"
906 help
907 This option enables s390 specific stack unwinder testing kernel
908 module. This option is not useful for distributions or general
909 kernels, but only for kernel developers working on architecture code.
910
911 Say N if you are unsure.
912
913config S390_KPROBES_SANITY_TEST
914 def_tristate n
915 prompt "Enable s390 specific kprobes tests"
916 depends on KPROBES
917 depends on KUNIT
918 help
919 This option enables an s390 specific kprobes test module. This option
920 is not useful for distributions or general kernels, but only for kernel
921 developers working on architecture code.
922
923 Say N if you are unsure.
924
925config S390_MODULES_SANITY_TEST
926 def_tristate n
927 depends on KUNIT
928 default KUNIT_ALL_TESTS
929 prompt "Enable s390 specific modules tests"
930 select S390_MODULES_SANITY_TEST_HELPERS
931 help
932 This option enables an s390 specific modules test. This option is
933 not useful for distributions or general kernels, but only for
934 kernel developers working on architecture code.
935
936 Say N if you are unsure.
937endmenu
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_TIME_VSYSCALL
32 def_bool y
33
34config GENERIC_CLOCKEVENTS
35 def_bool y
36
37config GENERIC_BUG
38 def_bool y if BUG
39
40config GENERIC_BUG_RELATIVE_POINTERS
41 def_bool y
42
43config NO_IOMEM
44 def_bool y
45
46config NO_DMA
47 def_bool y
48
49config ARCH_DMA_ADDR_T_64BIT
50 def_bool 64BIT
51
52config GENERIC_LOCKBREAK
53 def_bool y if SMP && PREEMPT
54
55config PGSTE
56 def_bool y if KVM
57
58config VIRT_CPU_ACCOUNTING
59 def_bool y
60
61config ARCH_SUPPORTS_DEBUG_PAGEALLOC
62 def_bool y
63
64config S390
65 def_bool y
66 select USE_GENERIC_SMP_HELPERS if SMP
67 select HAVE_SYSCALL_WRAPPERS
68 select HAVE_FUNCTION_TRACER
69 select HAVE_FUNCTION_TRACE_MCOUNT_TEST
70 select HAVE_FTRACE_MCOUNT_RECORD
71 select HAVE_C_RECORDMCOUNT
72 select HAVE_SYSCALL_TRACEPOINTS
73 select HAVE_DYNAMIC_FTRACE
74 select HAVE_FUNCTION_GRAPH_TRACER
75 select HAVE_REGS_AND_STACK_ACCESS_API
76 select HAVE_OPROFILE
77 select HAVE_KPROBES
78 select HAVE_KRETPROBES
79 select HAVE_KVM if 64BIT
80 select HAVE_ARCH_TRACEHOOK
81 select INIT_ALL_POSSIBLE
82 select HAVE_IRQ_WORK
83 select HAVE_PERF_EVENTS
84 select ARCH_HAVE_NMI_SAFE_CMPXCHG
85 select HAVE_KERNEL_GZIP
86 select HAVE_KERNEL_BZIP2
87 select HAVE_KERNEL_LZMA
88 select HAVE_KERNEL_LZO
89 select HAVE_KERNEL_XZ
90 select HAVE_GET_USER_PAGES_FAST
91 select HAVE_ARCH_MUTEX_CPU_RELAX
92 select HAVE_ARCH_JUMP_LABEL if !MARCH_G5
93 select HAVE_RCU_TABLE_FREE if SMP
94 select ARCH_INLINE_SPIN_TRYLOCK
95 select ARCH_INLINE_SPIN_TRYLOCK_BH
96 select ARCH_INLINE_SPIN_LOCK
97 select ARCH_INLINE_SPIN_LOCK_BH
98 select ARCH_INLINE_SPIN_LOCK_IRQ
99 select ARCH_INLINE_SPIN_LOCK_IRQSAVE
100 select ARCH_INLINE_SPIN_UNLOCK
101 select ARCH_INLINE_SPIN_UNLOCK_BH
102 select ARCH_INLINE_SPIN_UNLOCK_IRQ
103 select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE
104 select ARCH_INLINE_READ_TRYLOCK
105 select ARCH_INLINE_READ_LOCK
106 select ARCH_INLINE_READ_LOCK_BH
107 select ARCH_INLINE_READ_LOCK_IRQ
108 select ARCH_INLINE_READ_LOCK_IRQSAVE
109 select ARCH_INLINE_READ_UNLOCK
110 select ARCH_INLINE_READ_UNLOCK_BH
111 select ARCH_INLINE_READ_UNLOCK_IRQ
112 select ARCH_INLINE_READ_UNLOCK_IRQRESTORE
113 select ARCH_INLINE_WRITE_TRYLOCK
114 select ARCH_INLINE_WRITE_LOCK
115 select ARCH_INLINE_WRITE_LOCK_BH
116 select ARCH_INLINE_WRITE_LOCK_IRQ
117 select ARCH_INLINE_WRITE_LOCK_IRQSAVE
118 select ARCH_INLINE_WRITE_UNLOCK
119 select ARCH_INLINE_WRITE_UNLOCK_BH
120 select ARCH_INLINE_WRITE_UNLOCK_IRQ
121 select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE
122
123config SCHED_OMIT_FRAME_POINTER
124 def_bool y
125
126source "init/Kconfig"
127
128source "kernel/Kconfig.freezer"
129
130menu "Base setup"
131
132comment "Processor type and features"
133
134source "kernel/time/Kconfig"
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 KTIME_SCALAR
147 def_bool 32BIT
148
149config SMP
150 def_bool y
151 prompt "Symmetric multi-processing support"
152 ---help---
153 This enables support for systems with more than one CPU. If you have
154 a system with only one CPU, like most personal computers, say N. If
155 you have a system with more than one CPU, say Y.
156
157 If you say N here, the kernel will run on single and multiprocessor
158 machines, but will use only one CPU of a multiprocessor machine. If
159 you say Y here, the kernel will run on many, but not all,
160 singleprocessor machines. On a singleprocessor machine, the kernel
161 will run faster if you say N here.
162
163 See also the SMP-HOWTO available at
164 <http://www.tldp.org/docs.html#howto>.
165
166 Even if you don't know what to do here, say Y.
167
168config NR_CPUS
169 int "Maximum number of CPUs (2-64)"
170 range 2 64
171 depends on SMP
172 default "32" if !64BIT
173 default "64" if 64BIT
174 help
175 This allows you to specify the maximum number of CPUs which this
176 kernel will support. The maximum supported value is 64 and the
177 minimum value which makes sense is 2.
178
179 This is purely to save memory - each supported CPU adds
180 approximately sixteen kilobytes to the kernel image.
181
182config HOTPLUG_CPU
183 def_bool y
184 prompt "Support for hot-pluggable CPUs"
185 depends on SMP
186 select HOTPLUG
187 help
188 Say Y here to be able to turn CPUs off and on. CPUs
189 can be controlled through /sys/devices/system/cpu/cpu#.
190 Say N if you want to disable CPU hotplug.
191
192config SCHED_MC
193 def_bool y
194 prompt "Multi-core scheduler support"
195 depends on SMP
196 help
197 Multi-core scheduler support improves the CPU scheduler's decision
198 making when dealing with multi-core CPU chips at a cost of slightly
199 increased overhead in some places.
200
201config SCHED_BOOK
202 def_bool y
203 prompt "Book scheduler support"
204 depends on SMP && SCHED_MC
205 help
206 Book scheduler support improves the CPU scheduler's decision making
207 when dealing with machines that have several books.
208
209config MATHEMU
210 def_bool y
211 prompt "IEEE FPU emulation"
212 depends on MARCH_G5
213 help
214 This option is required for IEEE compliant floating point arithmetic
215 on older ESA/390 machines. Say Y unless you know your machine doesn't
216 need this.
217
218config COMPAT
219 def_bool y
220 prompt "Kernel support for 31 bit emulation"
221 depends on 64BIT
222 select COMPAT_BINFMT_ELF
223 help
224 Select this option if you want to enable your system kernel to
225 handle system-calls from ELF binaries for 31 bit ESA. This option
226 (and some other stuff like libraries and such) is needed for
227 executing 31 bit applications. It is safe to say "Y".
228
229config SYSVIPC_COMPAT
230 def_bool y if COMPAT && SYSVIPC
231
232config AUDIT_ARCH
233 def_bool y
234
235comment "Code generation options"
236
237choice
238 prompt "Processor type"
239 default MARCH_G5
240
241config MARCH_G5
242 bool "System/390 model G5 and G6"
243 depends on !64BIT
244 help
245 Select this to build a 31 bit kernel that works
246 on all ESA/390 and z/Architecture machines.
247
248config MARCH_Z900
249 bool "IBM zSeries model z800 and z900"
250 help
251 Select this to enable optimizations for model z800/z900 (2064 and
252 2066 series). This will enable some optimizations that are not
253 available on older ESA/390 (31 Bit) only CPUs.
254
255config MARCH_Z990
256 bool "IBM zSeries model z890 and z990"
257 help
258 Select this to enable optimizations for model z890/z990 (2084 and
259 2086 series). The kernel will be slightly faster but will not work
260 on older machines.
261
262config MARCH_Z9_109
263 bool "IBM System z9"
264 help
265 Select this to enable optimizations for IBM System z9 (2094 and
266 2096 series). The kernel will be slightly faster but will not work
267 on older machines.
268
269config MARCH_Z10
270 bool "IBM System z10"
271 help
272 Select this to enable optimizations for IBM System z10 (2097 and
273 2098 series). The kernel will be slightly faster but will not work
274 on older machines.
275
276config MARCH_Z196
277 bool "IBM zEnterprise 114 and 196"
278 help
279 Select this to enable optimizations for IBM zEnterprise 114 and 196
280 (2818 and 2817 series). The kernel will be slightly faster but will
281 not work on older machines.
282
283endchoice
284
285config PACK_STACK
286 def_bool y
287 prompt "Pack kernel stack"
288 help
289 This option enables the compiler option -mkernel-backchain if it
290 is available. If the option is available the compiler supports
291 the new stack layout which dramatically reduces the minimum stack
292 frame size. With an old compiler a non-leaf function needs a
293 minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
294 -mkernel-backchain the minimum size drops to 16 byte on 31 bit
295 and 24 byte on 64 bit.
296
297 Say Y if you are unsure.
298
299config SMALL_STACK
300 def_bool n
301 prompt "Use 8kb for kernel stack instead of 16kb"
302 depends on PACK_STACK && 64BIT && !LOCKDEP
303 help
304 If you say Y here and the compiler supports the -mkernel-backchain
305 option the kernel will use a smaller kernel stack size. The reduced
306 size is 8kb instead of 16kb. This allows to run more threads on a
307 system and reduces the pressure on the memory management for higher
308 order page allocations.
309
310 Say N if you are unsure.
311
312config CHECK_STACK
313 def_bool y
314 prompt "Detect kernel stack overflow"
315 help
316 This option enables the compiler option -mstack-guard and
317 -mstack-size if they are available. If the compiler supports them
318 it will emit additional code to each function prolog to trigger
319 an illegal operation if the kernel stack is about to overflow.
320
321 Say N if you are unsure.
322
323config STACK_GUARD
324 int "Size of the guard area (128-1024)"
325 range 128 1024
326 depends on CHECK_STACK
327 default "256"
328 help
329 This allows you to specify the size of the guard area at the lower
330 end of the kernel stack. If the kernel stack points into the guard
331 area on function entry an illegal operation is triggered. The size
332 needs to be a power of 2. Please keep in mind that the size of an
333 interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
334 The minimum size for the stack guard should be 256 for 31 bit and
335 512 for 64 bit.
336
337config WARN_DYNAMIC_STACK
338 def_bool n
339 prompt "Emit compiler warnings for function with dynamic stack usage"
340 help
341 This option enables the compiler option -mwarn-dynamicstack. If the
342 compiler supports this options generates warnings for functions
343 that dynamically allocate stack space using alloca.
344
345 Say N if you are unsure.
346
347config ARCH_POPULATES_NODE_MAP
348 def_bool y
349
350comment "Kernel preemption"
351
352source "kernel/Kconfig.preempt"
353
354config ARCH_SPARSEMEM_ENABLE
355 def_bool y
356 select SPARSEMEM_VMEMMAP_ENABLE
357 select SPARSEMEM_VMEMMAP
358 select SPARSEMEM_STATIC if !64BIT
359
360config ARCH_SPARSEMEM_DEFAULT
361 def_bool y
362
363config ARCH_SELECT_MEMORY_MODEL
364 def_bool y
365
366config ARCH_ENABLE_MEMORY_HOTPLUG
367 def_bool y if SPARSEMEM
368
369config ARCH_ENABLE_MEMORY_HOTREMOVE
370 def_bool y
371
372config ARCH_HIBERNATION_POSSIBLE
373 def_bool y if 64BIT
374
375source "mm/Kconfig"
376
377comment "I/O subsystem configuration"
378
379config QDIO
380 def_tristate y
381 prompt "QDIO support"
382 ---help---
383 This driver provides the Queued Direct I/O base support for
384 IBM System z.
385
386 To compile this driver as a module, choose M here: the
387 module will be called qdio.
388
389 If unsure, say Y.
390
391config CHSC_SCH
392 def_tristate m
393 prompt "Support for CHSC subchannels"
394 help
395 This driver allows usage of CHSC subchannels. A CHSC subchannel
396 is usually present on LPAR only.
397 The driver creates a device /dev/chsc, which may be used to
398 obtain I/O configuration information about the machine and
399 to issue asynchronous chsc commands (DANGEROUS).
400 You will usually only want to use this interface on a special
401 LPAR designated for system management.
402
403 To compile this driver as a module, choose M here: the
404 module will be called chsc_sch.
405
406 If unsure, say N.
407
408comment "Misc"
409
410config IPL
411 def_bool y
412 prompt "Builtin IPL record support"
413 help
414 If you want to use the produced kernel to IPL directly from a
415 device, you have to merge a bootsector specific to the device
416 into the first bytes of the kernel. You will have to select the
417 IPL device.
418
419choice
420 prompt "IPL method generated into head.S"
421 depends on IPL
422 default IPL_VM
423 help
424 Select "tape" if you want to IPL the image from a Tape.
425
426 Select "vm_reader" if you are running under VM/ESA and want
427 to IPL the image from the emulated card reader.
428
429config IPL_TAPE
430 bool "tape"
431
432config IPL_VM
433 bool "vm_reader"
434
435endchoice
436
437source "fs/Kconfig.binfmt"
438
439config FORCE_MAX_ZONEORDER
440 int
441 default "9"
442
443config PFAULT
444 def_bool y
445 prompt "Pseudo page fault support"
446 help
447 Select this option, if you want to use PFAULT pseudo page fault
448 handling under VM. If running native or in LPAR, this option
449 has no effect. If your VM does not support PFAULT, PAGEEX
450 pseudo page fault handling will be used.
451 Note that VM 4.2 supports PFAULT but has a bug in its
452 implementation that causes some problems.
453 Everybody who wants to run Linux under VM != VM4.2 should select
454 this option.
455
456config SHARED_KERNEL
457 def_bool y
458 prompt "VM shared kernel support"
459 help
460 Select this option, if you want to share the text segment of the
461 Linux kernel between different VM guests. This reduces memory
462 usage with lots of guests but greatly increases kernel size.
463 Also if a kernel was IPL'ed from a shared segment the kexec system
464 call will not work.
465 You should only select this option if you know what you are
466 doing and want to exploit this feature.
467
468config CMM
469 def_tristate n
470 prompt "Cooperative memory management"
471 help
472 Select this option, if you want to enable the kernel interface
473 to reduce the memory size of the system. This is accomplished
474 by allocating pages of memory and put them "on hold". This only
475 makes sense for a system running under VM where the unused pages
476 will be reused by VM for other guest systems. The interface
477 allows an external monitor to balance memory of many systems.
478 Everybody who wants to run Linux under VM should select this
479 option.
480
481config CMM_IUCV
482 def_bool y
483 prompt "IUCV special message interface to cooperative memory management"
484 depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
485 help
486 Select this option to enable the special message interface to
487 the cooperative memory management.
488
489config APPLDATA_BASE
490 def_bool n
491 prompt "Linux - VM Monitor Stream, base infrastructure"
492 depends on PROC_FS
493 help
494 This provides a kernel interface for creating and updating z/VM APPLDATA
495 monitor records. The monitor records are updated at certain time
496 intervals, once the timer is started.
497 Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
498 i.e. enables or disables monitoring on the Linux side.
499 A custom interval value (in seconds) can be written to
500 /proc/appldata/interval.
501
502 Defaults are 60 seconds interval and timer off.
503 The /proc entries can also be read from, showing the current settings.
504
505config APPLDATA_MEM
506 def_tristate m
507 prompt "Monitor memory management statistics"
508 depends on APPLDATA_BASE && VM_EVENT_COUNTERS
509 help
510 This provides memory management related data to the Linux - VM Monitor
511 Stream, like paging/swapping rate, memory utilisation, etc.
512 Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
513 APPLDATA monitor record, i.e. enables or disables monitoring this record
514 on the z/VM side.
515
516 Default is disabled.
517 The /proc entry can also be read from, showing the current settings.
518
519 This can also be compiled as a module, which will be called
520 appldata_mem.o.
521
522config APPLDATA_OS
523 def_tristate m
524 prompt "Monitor OS statistics"
525 depends on APPLDATA_BASE
526 help
527 This provides OS related data to the Linux - VM Monitor Stream, like
528 CPU utilisation, etc.
529 Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
530 APPLDATA monitor record, i.e. enables or disables monitoring this record
531 on the z/VM side.
532
533 Default is disabled.
534 This can also be compiled as a module, which will be called
535 appldata_os.o.
536
537config APPLDATA_NET_SUM
538 def_tristate m
539 prompt "Monitor overall network statistics"
540 depends on APPLDATA_BASE && NET
541 help
542 This provides network related data to the Linux - VM Monitor Stream,
543 currently there is only a total sum of network I/O statistics, no
544 per-interface data.
545 Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
546 APPLDATA monitor record, i.e. enables or disables monitoring this record
547 on the z/VM side.
548
549 Default is disabled.
550 This can also be compiled as a module, which will be called
551 appldata_net_sum.o.
552
553source kernel/Kconfig.hz
554
555config S390_HYPFS_FS
556 def_bool y
557 prompt "s390 hypervisor file system support"
558 select SYS_HYPERVISOR
559 help
560 This is a virtual file system intended to provide accounting
561 information in an s390 hypervisor environment.
562
563config KEXEC
564 def_bool n
565 prompt "kexec system call"
566 help
567 kexec is a system call that implements the ability to shutdown your
568 current kernel, and to start another kernel. It is like a reboot
569 but is independent of hardware/microcode support.
570
571config ZFCPDUMP
572 def_bool n
573 prompt "zfcpdump support"
574 select SMP
575 help
576 Select this option if you want to build an zfcpdump enabled kernel.
577 Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this.
578
579config S390_GUEST
580 def_bool y
581 prompt "s390 guest support for KVM (EXPERIMENTAL)"
582 depends on 64BIT && EXPERIMENTAL
583 select VIRTUALIZATION
584 select VIRTIO
585 select VIRTIO_RING
586 select VIRTIO_CONSOLE
587 help
588 Select this option if you want to run the kernel as a guest under
589 the KVM hypervisor. This will add detection for KVM as well as a
590 virtio transport. If KVM is detected, the virtio console will be
591 the default console.
592
593config SECCOMP
594 def_bool y
595 prompt "Enable seccomp to safely compute untrusted bytecode"
596 depends on PROC_FS
597 help
598 This kernel feature is useful for number crunching applications
599 that may need to compute untrusted bytecode during their
600 execution. By using pipes or other transports made available to
601 the process as file descriptors supporting the read/write
602 syscalls, it's possible to isolate those applications in
603 their own address space using seccomp. Once seccomp is
604 enabled via /proc/<pid>/seccomp, it cannot be disabled
605 and the task is only allowed to execute a few safe syscalls
606 defined by each seccomp mode.
607
608 If unsure, say Y.
609
610endmenu
611
612menu "Power Management"
613
614source "kernel/power/Kconfig"
615
616endmenu
617
618source "net/Kconfig"
619
620config PCMCIA
621 def_bool n
622
623config CCW
624 def_bool y
625
626source "drivers/Kconfig"
627
628source "fs/Kconfig"
629
630source "arch/s390/Kconfig.debug"
631
632source "security/Kconfig"
633
634source "crypto/Kconfig"
635
636source "lib/Kconfig"
637
638source "arch/s390/kvm/Kconfig"