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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 ARCH_PROC_KCORE_TEXT
21 def_bool y
22
23config GENERIC_HWEIGHT
24 def_bool !HAVE_MARCH_Z196_FEATURES
25
26config GENERIC_BUG
27 def_bool y if BUG
28
29config GENERIC_BUG_RELATIVE_POINTERS
30 def_bool y
31
32config GENERIC_LOCKBREAK
33 def_bool y if PREEMPTION
34
35config PGSTE
36 def_bool y if KVM
37
38config AUDIT_ARCH
39 def_bool y
40
41config NO_IOPORT_MAP
42 def_bool y
43
44config PCI_QUIRKS
45 def_bool n
46
47config ARCH_SUPPORTS_UPROBES
48 def_bool y
49
50config KASAN_SHADOW_OFFSET
51 hex
52 depends on KASAN
53 default 0x1C000000000000
54
55config GCC_ASM_FLAG_OUTPUT_BROKEN
56 def_bool CC_IS_GCC && GCC_VERSION < 140200
57 help
58 GCC versions before 14.2.0 may die with an internal
59 compiler error in some configurations if flag output
60 operands are used within inline assemblies.
61
62config S390
63 def_bool y
64 #
65 # Note: keep this list sorted alphabetically
66 #
67 imply IMA_SECURE_AND_OR_TRUSTED_BOOT
68 select ALTERNATE_USER_ADDRESS_SPACE
69 select ARCH_32BIT_USTAT_F_TINODE
70 select ARCH_BINFMT_ELF_STATE
71 select ARCH_CORRECT_STACKTRACE_ON_KRETPROBE
72 select ARCH_ENABLE_MEMORY_HOTPLUG if SPARSEMEM
73 select ARCH_ENABLE_MEMORY_HOTREMOVE
74 select ARCH_ENABLE_SPLIT_PMD_PTLOCK if PGTABLE_LEVELS > 2
75 select ARCH_HAS_CPU_FINALIZE_INIT
76 select ARCH_HAS_CURRENT_STACK_POINTER
77 select ARCH_HAS_DEBUG_VIRTUAL
78 select ARCH_HAS_DEBUG_VM_PGTABLE
79 select ARCH_HAS_DEBUG_WX
80 select ARCH_HAS_DEVMEM_IS_ALLOWED
81 select ARCH_HAS_DMA_OPS if PCI
82 select ARCH_HAS_ELF_RANDOMIZE
83 select ARCH_HAS_FORCE_DMA_UNENCRYPTED
84 select ARCH_HAS_FORTIFY_SOURCE
85 select ARCH_HAS_GCOV_PROFILE_ALL
86 select ARCH_HAS_GIGANTIC_PAGE
87 select ARCH_HAS_KCOV
88 select ARCH_HAS_MEMBARRIER_SYNC_CORE
89 select ARCH_HAS_MEM_ENCRYPT
90 select ARCH_HAS_NMI_SAFE_THIS_CPU_OPS
91 select ARCH_HAS_PREEMPT_LAZY
92 select ARCH_HAS_PTE_SPECIAL
93 select ARCH_HAS_SCALED_CPUTIME
94 select ARCH_HAS_SET_DIRECT_MAP
95 select ARCH_HAS_SET_MEMORY
96 select ARCH_HAS_STRICT_KERNEL_RWX
97 select ARCH_HAS_STRICT_MODULE_RWX
98 select ARCH_HAS_SYSCALL_WRAPPER
99 select ARCH_HAS_UBSAN
100 select ARCH_HAS_VDSO_TIME_DATA
101 select ARCH_HAVE_NMI_SAFE_CMPXCHG
102 select ARCH_INLINE_READ_LOCK
103 select ARCH_INLINE_READ_LOCK_BH
104 select ARCH_INLINE_READ_LOCK_IRQ
105 select ARCH_INLINE_READ_LOCK_IRQSAVE
106 select ARCH_INLINE_READ_TRYLOCK
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_SPIN_LOCK
112 select ARCH_INLINE_SPIN_LOCK_BH
113 select ARCH_INLINE_SPIN_LOCK_IRQ
114 select ARCH_INLINE_SPIN_LOCK_IRQSAVE
115 select ARCH_INLINE_SPIN_TRYLOCK
116 select ARCH_INLINE_SPIN_TRYLOCK_BH
117 select ARCH_INLINE_SPIN_UNLOCK
118 select ARCH_INLINE_SPIN_UNLOCK_BH
119 select ARCH_INLINE_SPIN_UNLOCK_IRQ
120 select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE
121 select ARCH_INLINE_WRITE_LOCK
122 select ARCH_INLINE_WRITE_LOCK_BH
123 select ARCH_INLINE_WRITE_LOCK_IRQ
124 select ARCH_INLINE_WRITE_LOCK_IRQSAVE
125 select ARCH_INLINE_WRITE_TRYLOCK
126 select ARCH_INLINE_WRITE_UNLOCK
127 select ARCH_INLINE_WRITE_UNLOCK_BH
128 select ARCH_INLINE_WRITE_UNLOCK_IRQ
129 select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE
130 select ARCH_MHP_MEMMAP_ON_MEMORY_ENABLE
131 select ARCH_STACKWALK
132 select ARCH_SUPPORTS_ATOMIC_RMW
133 select ARCH_SUPPORTS_DEBUG_PAGEALLOC
134 select ARCH_SUPPORTS_HUGETLBFS
135 select ARCH_SUPPORTS_INT128 if CC_HAS_INT128 && CC_IS_CLANG
136 select ARCH_SUPPORTS_NUMA_BALANCING
137 select ARCH_SUPPORTS_PER_VMA_LOCK
138 select ARCH_USE_BUILTIN_BSWAP
139 select ARCH_USE_CMPXCHG_LOCKREF
140 select ARCH_USE_SYM_ANNOTATIONS
141 select ARCH_WANTS_NO_INSTR
142 select ARCH_WANT_DEFAULT_BPF_JIT
143 select ARCH_WANT_IPC_PARSE_VERSION
144 select ARCH_WANT_KERNEL_PMD_MKWRITE
145 select ARCH_WANT_LD_ORPHAN_WARN
146 select ARCH_WANT_OPTIMIZE_HUGETLB_VMEMMAP
147 select BUILDTIME_TABLE_SORT
148 select CLONE_BACKWARDS2
149 select DCACHE_WORD_ACCESS if !KMSAN
150 select DYNAMIC_FTRACE if FUNCTION_TRACER
151 select FUNCTION_ALIGNMENT_8B if CC_IS_GCC
152 select FUNCTION_ALIGNMENT_16B if !CC_IS_GCC
153 select GENERIC_ALLOCATOR
154 select GENERIC_CPU_DEVICES
155 select GENERIC_CPU_AUTOPROBE
156 select GENERIC_CPU_VULNERABILITIES
157 select GENERIC_ENTRY
158 select GENERIC_GETTIMEOFDAY
159 select GENERIC_PTDUMP
160 select GENERIC_SMP_IDLE_THREAD
161 select GENERIC_TIME_VSYSCALL
162 select GENERIC_VDSO_TIME_NS
163 select GENERIC_IOREMAP if PCI
164 select HAVE_ALIGNED_STRUCT_PAGE
165 select HAVE_ARCH_AUDITSYSCALL
166 select HAVE_ARCH_JUMP_LABEL
167 select HAVE_ARCH_JUMP_LABEL_RELATIVE
168 select HAVE_ARCH_KASAN
169 select HAVE_ARCH_KASAN_VMALLOC
170 select HAVE_ARCH_KCSAN
171 select HAVE_ARCH_KMSAN
172 select HAVE_ARCH_KFENCE
173 select HAVE_ARCH_RANDOMIZE_KSTACK_OFFSET
174 select HAVE_ARCH_SECCOMP_FILTER
175 select HAVE_ARCH_SOFT_DIRTY
176 select HAVE_ARCH_STACKLEAK
177 select HAVE_ARCH_TRACEHOOK
178 select HAVE_ARCH_TRANSPARENT_HUGEPAGE
179 select HAVE_ARCH_VMAP_STACK
180 select HAVE_ASM_MODVERSIONS
181 select HAVE_CMPXCHG_DOUBLE
182 select HAVE_CMPXCHG_LOCAL
183 select HAVE_DEBUG_KMEMLEAK
184 select HAVE_DMA_CONTIGUOUS
185 select HAVE_DYNAMIC_FTRACE
186 select HAVE_DYNAMIC_FTRACE_WITH_ARGS
187 select HAVE_DYNAMIC_FTRACE_WITH_DIRECT_CALLS
188 select HAVE_DYNAMIC_FTRACE_WITH_REGS
189 select HAVE_EBPF_JIT if HAVE_MARCH_Z196_FEATURES
190 select HAVE_EFFICIENT_UNALIGNED_ACCESS
191 select HAVE_GUP_FAST
192 select HAVE_FENTRY
193 select HAVE_FTRACE_MCOUNT_RECORD
194 select HAVE_FUNCTION_ARG_ACCESS_API
195 select HAVE_FUNCTION_ERROR_INJECTION
196 select HAVE_FUNCTION_GRAPH_RETVAL
197 select HAVE_FUNCTION_GRAPH_TRACER
198 select HAVE_FUNCTION_TRACER
199 select HAVE_GCC_PLUGINS
200 select HAVE_GENERIC_VDSO
201 select HAVE_IOREMAP_PROT if PCI
202 select HAVE_KERNEL_BZIP2
203 select HAVE_KERNEL_GZIP
204 select HAVE_KERNEL_LZ4
205 select HAVE_KERNEL_LZMA
206 select HAVE_KERNEL_LZO
207 select HAVE_KERNEL_UNCOMPRESSED
208 select HAVE_KERNEL_XZ
209 select HAVE_KERNEL_ZSTD
210 select HAVE_KPROBES
211 select HAVE_KPROBES_ON_FTRACE
212 select HAVE_KRETPROBES
213 select HAVE_LIVEPATCH
214 select HAVE_MEMBLOCK_PHYS_MAP
215 select HAVE_MOD_ARCH_SPECIFIC
216 select HAVE_NMI
217 select HAVE_NOP_MCOUNT
218 select HAVE_PAGE_SIZE_4KB
219 select HAVE_PCI
220 select HAVE_PERF_EVENTS
221 select HAVE_PERF_REGS
222 select HAVE_PERF_USER_STACK_DUMP
223 select HAVE_PREEMPT_DYNAMIC_KEY
224 select HAVE_REGS_AND_STACK_ACCESS_API
225 select HAVE_RELIABLE_STACKTRACE
226 select HAVE_RETHOOK
227 select HAVE_RSEQ
228 select HAVE_SAMPLE_FTRACE_DIRECT
229 select HAVE_SAMPLE_FTRACE_DIRECT_MULTI
230 select HAVE_SETUP_PER_CPU_AREA
231 select HAVE_SOFTIRQ_ON_OWN_STACK
232 select HAVE_SYSCALL_TRACEPOINTS
233 select HAVE_VIRT_CPU_ACCOUNTING
234 select HAVE_VIRT_CPU_ACCOUNTING_IDLE
235 select IOMMU_HELPER if PCI
236 select IOMMU_SUPPORT if PCI
237 select LOCK_MM_AND_FIND_VMA
238 select MMU_GATHER_MERGE_VMAS
239 select MMU_GATHER_NO_GATHER
240 select MMU_GATHER_RCU_TABLE_FREE
241 select MODULES_USE_ELF_RELA
242 select NEED_DMA_MAP_STATE if PCI
243 select NEED_PER_CPU_EMBED_FIRST_CHUNK
244 select NEED_SG_DMA_LENGTH if PCI
245 select OLD_SIGACTION
246 select OLD_SIGSUSPEND3
247 select PCI_DOMAINS if PCI
248 select PCI_MSI if PCI
249 select PCI_MSI_ARCH_FALLBACKS if PCI_MSI
250 select SPARSE_IRQ
251 select SWIOTLB
252 select SYSCTL_EXCEPTION_TRACE
253 select THREAD_INFO_IN_TASK
254 select TRACE_IRQFLAGS_SUPPORT
255 select TTY
256 select USER_STACKTRACE_SUPPORT
257 select VDSO_GETRANDOM
258 select VIRT_CPU_ACCOUNTING
259 select ZONE_DMA
260 # Note: keep the above list sorted alphabetically
261
262config SCHED_OMIT_FRAME_POINTER
263 def_bool y
264
265config PGTABLE_LEVELS
266 int
267 default 5
268
269source "kernel/livepatch/Kconfig"
270
271config ARCH_SUPPORTS_KEXEC
272 def_bool y
273
274config ARCH_SUPPORTS_KEXEC_FILE
275 def_bool y
276
277config ARCH_SUPPORTS_KEXEC_SIG
278 def_bool MODULE_SIG_FORMAT
279
280config ARCH_SUPPORTS_KEXEC_PURGATORY
281 def_bool y
282
283config ARCH_SUPPORTS_CRASH_DUMP
284 def_bool y
285 help
286 Refer to <file:Documentation/arch/s390/zfcpdump.rst> for more details on this.
287 This option also enables s390 zfcpdump.
288 See also <file:Documentation/arch/s390/zfcpdump.rst>
289
290config ARCH_DEFAULT_CRASH_DUMP
291 def_bool y
292
293menu "Processor type and features"
294
295config HAVE_MARCH_Z10_FEATURES
296 def_bool n
297
298config HAVE_MARCH_Z196_FEATURES
299 def_bool n
300 select HAVE_MARCH_Z10_FEATURES
301
302config HAVE_MARCH_ZEC12_FEATURES
303 def_bool n
304 select HAVE_MARCH_Z196_FEATURES
305
306config HAVE_MARCH_Z13_FEATURES
307 def_bool n
308 select HAVE_MARCH_ZEC12_FEATURES
309
310config HAVE_MARCH_Z14_FEATURES
311 def_bool n
312 select HAVE_MARCH_Z13_FEATURES
313
314config HAVE_MARCH_Z15_FEATURES
315 def_bool n
316 select HAVE_MARCH_Z14_FEATURES
317
318config HAVE_MARCH_Z16_FEATURES
319 def_bool n
320 select HAVE_MARCH_Z15_FEATURES
321
322choice
323 prompt "Processor type"
324 default MARCH_Z196
325
326config MARCH_Z10
327 bool "IBM System z10"
328 select HAVE_MARCH_Z10_FEATURES
329 depends on $(cc-option,-march=z10)
330 help
331 Select this to enable optimizations for IBM System z10 (2097 and 2098
332 series). This is the oldest machine generation currently supported.
333
334config MARCH_Z196
335 bool "IBM zEnterprise 114 and 196"
336 select HAVE_MARCH_Z196_FEATURES
337 depends on $(cc-option,-march=z196)
338 help
339 Select this to enable optimizations for IBM zEnterprise 114 and 196
340 (2818 and 2817 series). The kernel will be slightly faster but will
341 not work on older machines.
342
343config MARCH_ZEC12
344 bool "IBM zBC12 and zEC12"
345 select HAVE_MARCH_ZEC12_FEATURES
346 depends on $(cc-option,-march=zEC12)
347 help
348 Select this to enable optimizations for IBM zBC12 and zEC12 (2828 and
349 2827 series). The kernel will be slightly faster but will not work on
350 older machines.
351
352config MARCH_Z13
353 bool "IBM z13s and z13"
354 select HAVE_MARCH_Z13_FEATURES
355 depends on $(cc-option,-march=z13)
356 help
357 Select this to enable optimizations for IBM z13s and z13 (2965 and
358 2964 series). The kernel will be slightly faster but will not work on
359 older machines.
360
361config MARCH_Z14
362 bool "IBM z14 ZR1 and z14"
363 select HAVE_MARCH_Z14_FEATURES
364 depends on $(cc-option,-march=z14)
365 help
366 Select this to enable optimizations for IBM z14 ZR1 and z14 (3907
367 and 3906 series). The kernel will be slightly faster but will not
368 work on older machines.
369
370config MARCH_Z15
371 bool "IBM z15"
372 select HAVE_MARCH_Z15_FEATURES
373 depends on $(cc-option,-march=z15)
374 help
375 Select this to enable optimizations for IBM z15 (8562
376 and 8561 series). The kernel will be slightly faster but will not
377 work on older machines.
378
379config MARCH_Z16
380 bool "IBM z16"
381 select HAVE_MARCH_Z16_FEATURES
382 depends on $(cc-option,-march=z16)
383 help
384 Select this to enable optimizations for IBM z16 (3931 and
385 3932 series).
386
387endchoice
388
389config MARCH_Z10_TUNE
390 def_bool TUNE_Z10 || MARCH_Z10 && TUNE_DEFAULT
391
392config MARCH_Z196_TUNE
393 def_bool TUNE_Z196 || MARCH_Z196 && TUNE_DEFAULT
394
395config MARCH_ZEC12_TUNE
396 def_bool TUNE_ZEC12 || MARCH_ZEC12 && TUNE_DEFAULT
397
398config MARCH_Z13_TUNE
399 def_bool TUNE_Z13 || MARCH_Z13 && TUNE_DEFAULT
400
401config MARCH_Z14_TUNE
402 def_bool TUNE_Z14 || MARCH_Z14 && TUNE_DEFAULT
403
404config MARCH_Z15_TUNE
405 def_bool TUNE_Z15 || MARCH_Z15 && TUNE_DEFAULT
406
407config MARCH_Z16_TUNE
408 def_bool TUNE_Z16 || MARCH_Z16 && TUNE_DEFAULT
409
410choice
411 prompt "Tune code generation"
412 default TUNE_DEFAULT
413 help
414 Cause the compiler to tune (-mtune) the generated code for a machine.
415 This will make the code run faster on the selected machine but
416 somewhat slower on other machines.
417 This option only changes how the compiler emits instructions, not the
418 selection of instructions itself, so the resulting kernel will run on
419 all other machines.
420
421config TUNE_DEFAULT
422 bool "Default"
423 help
424 Tune the generated code for the target processor for which the kernel
425 will be compiled.
426
427config TUNE_Z10
428 bool "IBM System z10"
429
430config TUNE_Z196
431 bool "IBM zEnterprise 114 and 196"
432 depends on $(cc-option,-mtune=z196)
433
434config TUNE_ZEC12
435 bool "IBM zBC12 and zEC12"
436 depends on $(cc-option,-mtune=zEC12)
437
438config TUNE_Z13
439 bool "IBM z13s and z13"
440 depends on $(cc-option,-mtune=z13)
441
442config TUNE_Z14
443 bool "IBM z14 ZR1 and z14"
444 depends on $(cc-option,-mtune=z14)
445
446config TUNE_Z15
447 bool "IBM z15"
448 depends on $(cc-option,-mtune=z15)
449
450config TUNE_Z16
451 bool "IBM z16"
452 depends on $(cc-option,-mtune=z16)
453
454endchoice
455
456config 64BIT
457 def_bool y
458
459config COMMAND_LINE_SIZE
460 int "Maximum size of kernel command line"
461 default 4096
462 range 896 1048576
463 help
464 This allows you to specify the maximum length of the kernel command
465 line.
466
467config COMPAT
468 def_bool n
469 prompt "Kernel support for 31 bit emulation"
470 select ARCH_WANT_OLD_COMPAT_IPC
471 select COMPAT_OLD_SIGACTION
472 select HAVE_UID16
473 depends on MULTIUSER
474 depends on !CC_IS_CLANG && !LD_IS_LLD
475 help
476 Select this option if you want to enable your system kernel to
477 handle system-calls from ELF binaries for 31 bit ESA. This option
478 (and some other stuff like libraries and such) is needed for
479 executing 31 bit applications.
480
481 If unsure say N.
482
483config SMP
484 def_bool y
485
486config NR_CPUS
487 int "Maximum number of CPUs (2-512)"
488 range 2 512
489 default "64"
490 help
491 This allows you to specify the maximum number of CPUs which this
492 kernel will support. The maximum supported value is 512 and the
493 minimum value which makes sense is 2.
494
495 This is purely to save memory - each supported CPU adds
496 approximately sixteen kilobytes to the kernel image.
497
498config HOTPLUG_CPU
499 def_bool y
500
501config NUMA
502 bool "NUMA support"
503 depends on SCHED_TOPOLOGY
504 default n
505 help
506 Enable NUMA support
507
508 This option adds NUMA support to the kernel.
509
510config NODES_SHIFT
511 int
512 depends on NUMA
513 default "1"
514
515config SCHED_SMT
516 def_bool n
517
518config SCHED_MC
519 def_bool n
520
521config SCHED_TOPOLOGY
522 def_bool y
523 prompt "Topology scheduler support"
524 select SCHED_SMT
525 select SCHED_MC
526 help
527 Topology scheduler support improves the CPU scheduler's decision
528 making when dealing with machines that have multi-threading,
529 multiple cores or multiple books.
530
531config SCHED_TOPOLOGY_VERTICAL
532 def_bool y
533 bool "Use vertical CPU polarization by default"
534 depends on SCHED_TOPOLOGY
535 help
536 Use vertical CPU polarization by default if available.
537 The default CPU polarization is horizontal.
538
539config HIPERDISPATCH_ON
540 def_bool y
541 bool "Use hiperdispatch on vertical polarization by default"
542 depends on SCHED_TOPOLOGY
543 depends on PROC_SYSCTL
544 help
545 Hiperdispatch aims to improve the CPU scheduler's decision
546 making when using vertical polarization by adjusting CPU
547 capacities dynamically. Set this option to use hiperdispatch
548 on vertical polarization by default. This can be overwritten
549 by sysctl's s390.hiperdispatch attribute later on.
550
551source "kernel/Kconfig.hz"
552
553config CERT_STORE
554 bool "Get user certificates via DIAG320"
555 depends on KEYS
556 select CRYPTO_LIB_SHA256
557 help
558 Enable this option if you want to access user-provided secure boot
559 certificates via DIAG 0x320.
560
561 These certificates will be made available via the keyring named
562 'cert_store'.
563
564config KERNEL_NOBP
565 def_bool n
566 prompt "Enable modified branch prediction for the kernel by default"
567 help
568 If this option is selected the kernel will switch to a modified
569 branch prediction mode if the firmware interface is available.
570 The modified branch prediction mode improves the behaviour in
571 regard to speculative execution.
572
573 With the option enabled the kernel parameter "nobp=0" or "nospec"
574 can be used to run the kernel in the normal branch prediction mode.
575
576 With the option disabled the modified branch prediction mode is
577 enabled with the "nobp=1" kernel parameter.
578
579 If unsure, say N.
580
581config EXPOLINE
582 def_bool n
583 depends on $(cc-option,-mindirect-branch=thunk)
584 prompt "Avoid speculative indirect branches in the kernel"
585 help
586 Compile the kernel with the expoline compiler options to guard
587 against kernel-to-user data leaks by avoiding speculative indirect
588 branches.
589 Requires a compiler with -mindirect-branch=thunk support for full
590 protection. The kernel may run slower.
591
592 If unsure, say N.
593
594config EXPOLINE_EXTERN
595 def_bool EXPOLINE && CC_IS_GCC && GCC_VERSION >= 110200 && \
596 $(success,$(srctree)/arch/s390/tools/gcc-thunk-extern.sh $(CC))
597 help
598 Generate expolines as external functions if the compiler supports it.
599 This option is required for some tooling like kpatch, if expolines
600 are enabled. The kernel is compiled with
601 -mindirect-branch=thunk-extern, which requires a newer compiler.
602
603choice
604 prompt "Expoline default"
605 depends on EXPOLINE
606 default EXPOLINE_FULL
607
608config EXPOLINE_OFF
609 bool "spectre_v2=off"
610
611config EXPOLINE_AUTO
612 bool "spectre_v2=auto"
613
614config EXPOLINE_FULL
615 bool "spectre_v2=on"
616
617endchoice
618
619config RELOCATABLE
620 def_bool y
621 help
622 This builds a kernel image that retains relocation information
623 so it can be loaded at an arbitrary address.
624 The relocations make the kernel image about 15% larger (compressed
625 10%), but are discarded at runtime.
626 Note: this option exists only for documentation purposes, please do
627 not remove it.
628
629config RANDOMIZE_BASE
630 bool "Randomize the address of the kernel image (KASLR)"
631 default y
632 help
633 In support of Kernel Address Space Layout Randomization (KASLR),
634 this randomizes the address at which the kernel image is loaded,
635 as a security feature that deters exploit attempts relying on
636 knowledge of the location of kernel internals.
637
638config RANDOMIZE_IDENTITY_BASE
639 bool "Randomize the address of the identity mapping base"
640 depends on RANDOMIZE_BASE
641 default DEBUG_VM
642 help
643 The identity mapping base address is pinned to zero by default.
644 Allow randomization of that base to expose otherwise missed
645 notion of physical and virtual addresses of data structures.
646 That does not have any impact on the base address at which the
647 kernel image is loaded.
648
649 If unsure, say N
650
651config KERNEL_IMAGE_BASE
652 hex "Kernel image base address"
653 range 0x100000 0x1FFFFFE0000000 if !KASAN
654 range 0x100000 0x1BFFFFE0000000 if KASAN
655 default 0x3FFE0000000 if !KASAN
656 default 0x7FFFE0000000 if KASAN
657 help
658 This is the address at which the kernel image is loaded in case
659 Kernel Address Space Layout Randomization (KASLR) is disabled.
660
661 In case the Protected virtualization guest support is enabled the
662 Ultravisor imposes a virtual address limit. If the value of this
663 option leads to the kernel image exceeding the Ultravisor limit,
664 this option is ignored and the image is loaded below the limit.
665
666 If the value of this option leads to the kernel image overlapping
667 the virtual memory where other data structures are located, this
668 option is ignored and the image is loaded above the structures.
669
670endmenu
671
672menu "Memory setup"
673
674config ARCH_SPARSEMEM_ENABLE
675 def_bool y
676 select SPARSEMEM_VMEMMAP_ENABLE
677 select SPARSEMEM_VMEMMAP
678
679config ARCH_SPARSEMEM_DEFAULT
680 def_bool y
681
682config MAX_PHYSMEM_BITS
683 int "Maximum size of supported physical memory in bits (42-53)"
684 range 42 53
685 default "46"
686 help
687 This option specifies the maximum supported size of physical memory
688 in bits. Supported is any size between 2^42 (4TB) and 2^53 (8PB).
689 Increasing the number of bits also increases the kernel image size.
690 By default 46 bits (64TB) are supported.
691
692config CHECK_STACK
693 def_bool y
694 depends on !VMAP_STACK
695 prompt "Detect kernel stack overflow"
696 help
697 This option enables the compiler option -mstack-guard and
698 -mstack-size if they are available. If the compiler supports them
699 it will emit additional code to each function prolog to trigger
700 an illegal operation if the kernel stack is about to overflow.
701
702 Say N if you are unsure.
703
704config STACK_GUARD
705 int "Size of the guard area (128-1024)"
706 range 128 1024
707 depends on CHECK_STACK
708 default "256"
709 help
710 This allows you to specify the size of the guard area at the lower
711 end of the kernel stack. If the kernel stack points into the guard
712 area on function entry an illegal operation is triggered. The size
713 needs to be a power of 2. Please keep in mind that the size of an
714 interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
715 The minimum size for the stack guard should be 256 for 31 bit and
716 512 for 64 bit.
717
718endmenu
719
720menu "I/O subsystem"
721
722config QDIO
723 def_tristate y
724 prompt "QDIO support"
725 help
726 This driver provides the Queued Direct I/O base support for
727 IBM System z.
728
729 To compile this driver as a module, choose M here: the
730 module will be called qdio.
731
732 If unsure, say Y.
733
734if PCI
735
736config PCI_NR_FUNCTIONS
737 int "Maximum number of PCI functions (1-4096)"
738 range 1 4096
739 default "512"
740 help
741 This allows you to specify the maximum number of PCI functions which
742 this kernel will support.
743
744endif # PCI
745
746config HAS_IOMEM
747 def_bool PCI
748
749config CHSC_SCH
750 def_tristate m
751 prompt "Support for CHSC subchannels"
752 help
753 This driver allows usage of CHSC subchannels. A CHSC subchannel
754 is usually present on LPAR only.
755 The driver creates a device /dev/chsc, which may be used to
756 obtain I/O configuration information about the machine and
757 to issue asynchronous chsc commands (DANGEROUS).
758 You will usually only want to use this interface on a special
759 LPAR designated for system management.
760
761 To compile this driver as a module, choose M here: the
762 module will be called chsc_sch.
763
764 If unsure, say N.
765
766config SCM_BUS
767 def_bool y
768 prompt "SCM bus driver"
769 help
770 Bus driver for Storage Class Memory.
771
772config EADM_SCH
773 def_tristate m
774 prompt "Support for EADM subchannels"
775 depends on SCM_BUS
776 help
777 This driver allows usage of EADM subchannels. EADM subchannels act
778 as a communication vehicle for SCM increments.
779
780 To compile this driver as a module, choose M here: the
781 module will be called eadm_sch.
782
783config AP
784 def_tristate y
785 prompt "Support for Adjunct Processors (ap)"
786 help
787 This driver allows usage to Adjunct Processor (AP) devices via
788 the ap bus, cards and queues. Supported Adjunct Processors are
789 the CryptoExpress Cards (CEX).
790
791 To compile this driver as a module, choose M here: the
792 module will be called ap.
793
794 If unsure, say Y (default).
795
796config AP_DEBUG
797 def_bool n
798 prompt "Enable debug features for Adjunct Processor (ap) devices"
799 depends on AP
800 help
801 Say 'Y' here to enable some additional debug features for Adjunct
802 Processor (ap) devices.
803
804 There will be some more sysfs attributes displayed for ap queues.
805
806 Do not enable on production level kernel build.
807
808 If unsure, say N.
809
810config VFIO_CCW
811 def_tristate n
812 prompt "Support for VFIO-CCW subchannels"
813 depends on VFIO
814 select VFIO_MDEV
815 help
816 This driver allows usage of I/O subchannels via VFIO-CCW.
817
818 To compile this driver as a module, choose M here: the
819 module will be called vfio_ccw.
820
821config VFIO_AP
822 def_tristate n
823 prompt "VFIO support for AP devices"
824 depends on KVM
825 depends on VFIO
826 depends on AP
827 select VFIO_MDEV
828 help
829 This driver grants access to Adjunct Processor (AP) devices
830 via the VFIO mediated device interface.
831
832 To compile this driver as a module, choose M here: the module
833 will be called vfio_ap.
834
835endmenu
836
837config CCW
838 def_bool y
839
840config HAVE_PNETID
841 tristate
842 default (SMC || CCWGROUP)
843
844menu "Virtualization"
845
846config PFAULT
847 def_bool y
848 prompt "Pseudo page fault support"
849 help
850 Select this option, if you want to use PFAULT pseudo page fault
851 handling under VM. If running native or in LPAR, this option
852 has no effect. If your VM does not support PFAULT, PAGEEX
853 pseudo page fault handling will be used.
854 Note that VM 4.2 supports PFAULT but has a bug in its
855 implementation that causes some problems.
856 Everybody who wants to run Linux under VM != VM4.2 should select
857 this option.
858
859config CMM
860 def_tristate n
861 prompt "Cooperative memory management"
862 help
863 Select this option, if you want to enable the kernel interface
864 to reduce the memory size of the system. This is accomplished
865 by allocating pages of memory and put them "on hold". This only
866 makes sense for a system running under VM where the unused pages
867 will be reused by VM for other guest systems. The interface
868 allows an external monitor to balance memory of many systems.
869 Everybody who wants to run Linux under VM should select this
870 option.
871
872config CMM_IUCV
873 def_bool y
874 prompt "IUCV special message interface to cooperative memory management"
875 depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
876 help
877 Select this option to enable the special message interface to
878 the cooperative memory management.
879
880config APPLDATA_BASE
881 def_bool n
882 prompt "Linux - VM Monitor Stream, base infrastructure"
883 depends on PROC_SYSCTL
884 help
885 This provides a kernel interface for creating and updating z/VM APPLDATA
886 monitor records. The monitor records are updated at certain time
887 intervals, once the timer is started.
888 Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
889 i.e. enables or disables monitoring on the Linux side.
890 A custom interval value (in seconds) can be written to
891 /proc/appldata/interval.
892
893 Defaults are 60 seconds interval and timer off.
894 The /proc entries can also be read from, showing the current settings.
895
896config APPLDATA_MEM
897 def_tristate m
898 prompt "Monitor memory management statistics"
899 depends on APPLDATA_BASE && VM_EVENT_COUNTERS
900 help
901 This provides memory management related data to the Linux - VM Monitor
902 Stream, like paging/swapping rate, memory utilisation, etc.
903 Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
904 APPLDATA monitor record, i.e. enables or disables monitoring this record
905 on the z/VM side.
906
907 Default is disabled.
908 The /proc entry can also be read from, showing the current settings.
909
910 This can also be compiled as a module, which will be called
911 appldata_mem.o.
912
913config APPLDATA_OS
914 def_tristate m
915 prompt "Monitor OS statistics"
916 depends on APPLDATA_BASE
917 help
918 This provides OS related data to the Linux - VM Monitor Stream, like
919 CPU utilisation, etc.
920 Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
921 APPLDATA monitor record, i.e. enables or disables monitoring this record
922 on the z/VM side.
923
924 Default is disabled.
925 This can also be compiled as a module, which will be called
926 appldata_os.o.
927
928config APPLDATA_NET_SUM
929 def_tristate m
930 prompt "Monitor overall network statistics"
931 depends on APPLDATA_BASE && NET
932 help
933 This provides network related data to the Linux - VM Monitor Stream,
934 currently there is only a total sum of network I/O statistics, no
935 per-interface data.
936 Writing 1 or 0 to /proc/appldata/net_sum 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_net_sum.o.
943
944config S390_HYPFS
945 def_bool y
946 prompt "s390 hypervisor information"
947 help
948 This provides several binary files at (debugfs)/s390_hypfs/ to
949 provide accounting information in an s390 hypervisor environment.
950
951config S390_HYPFS_FS
952 def_bool n
953 prompt "s390 hypervisor file system support"
954 select SYS_HYPERVISOR
955 depends on S390_HYPFS
956 help
957 This is a virtual file system intended to provide accounting
958 information in an s390 hypervisor environment. This file system
959 is deprecated and should not be used.
960
961 Say N if you are unsure.
962
963source "arch/s390/kvm/Kconfig"
964
965config S390_GUEST
966 def_bool y
967 prompt "s390 support for virtio devices"
968 select TTY
969 select VIRTUALIZATION
970 select VIRTIO
971 help
972 Enabling this option adds support for virtio based paravirtual device
973 drivers on s390.
974
975 Select this option if you want to run the kernel as a guest under
976 the KVM hypervisor.
977
978endmenu
979
980config S390_MODULES_SANITY_TEST_HELPERS
981 def_bool n
982
983menu "Selftests"
984
985config S390_UNWIND_SELFTEST
986 def_tristate n
987 depends on KUNIT
988 default KUNIT_ALL_TESTS
989 prompt "Test unwind functions"
990 help
991 This option enables s390 specific stack unwinder testing kernel
992 module. This option is not useful for distributions or general
993 kernels, but only for kernel developers working on architecture code.
994
995 Say N if you are unsure.
996
997config S390_KPROBES_SANITY_TEST
998 def_tristate n
999 prompt "Enable s390 specific kprobes tests"
1000 depends on KPROBES
1001 depends on KUNIT
1002 help
1003 This option enables an s390 specific kprobes test module. This option
1004 is not useful for distributions or general kernels, but only for kernel
1005 developers working on architecture code.
1006
1007 Say N if you are unsure.
1008
1009config S390_MODULES_SANITY_TEST
1010 def_tristate n
1011 depends on KUNIT
1012 default KUNIT_ALL_TESTS
1013 prompt "Enable s390 specific modules tests"
1014 select S390_MODULES_SANITY_TEST_HELPERS
1015 help
1016 This option enables an s390 specific modules test. This option is
1017 not useful for distributions or general kernels, but only for
1018 kernel developers working on architecture code.
1019
1020 Say N if you are unsure.
1021endmenu
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"