1 # SPDX-License-Identifier: GPL-2.0
2 config MMU
3 def_bool y
4
5 config CPU_BIG_ENDIAN
6 def_bool y
7
8 config LOCKDEP_SUPPORT
9 def_bool y
10
11 config STACKTRACE_SUPPORT
12 def_bool y
13
14 config ARCH_HAS_ILOG2_U32
15 def_bool n
16
17 config ARCH_HAS_ILOG2_U64
18 def_bool n
19
20 config ARCH_PROC_KCORE_TEXT
21 def_bool y
22
23 config GENERIC_HWEIGHT
24 def_bool !HAVE_MARCH_Z196_FEATURES
25
26 config GENERIC_BUG
27 def_bool y if BUG
28
29 config GENERIC_BUG_RELATIVE_POINTERS
30 def_bool y
31
32 config GENERIC_LOCKBREAK
33 def_bool y if PREEMPTION
34
35 config PGSTE
36 def_bool y if KVM
37
38 config AUDIT_ARCH
39 def_bool y
40
41 config NO_IOPORT_MAP
42 def_bool y
43
44 config PCI_QUIRKS
45 def_bool n
46
47 config ARCH_SUPPORTS_UPROBES
48 def_bool y
49
50 config KASAN_SHADOW_OFFSET
51 hex
52 depends on KASAN
53 default 0x1C000000000000
54
55 config S390
56 def_bool y
57 #
58 # Note: keep this list sorted alphabet
59 #
60 imply IMA_SECURE_AND_OR_TRUSTED_BOOT
61 select ALTERNATE_USER_ADDRESS_SPACE
62 select ARCH_32BIT_USTAT_F_TINODE
63 select ARCH_BINFMT_ELF_STATE
64 select ARCH_CORRECT_STACKTRACE_ON_KRET
65 select ARCH_ENABLE_MEMORY_HOTPLUG if S
66 select ARCH_ENABLE_MEMORY_HOTREMOVE
67 select ARCH_ENABLE_SPLIT_PMD_PTLOCK if
68 select ARCH_HAS_CURRENT_STACK_POINTER
69 select ARCH_HAS_DEBUG_VIRTUAL
70 select ARCH_HAS_DEBUG_VM_PGTABLE
71 select ARCH_HAS_DEBUG_WX
72 select ARCH_HAS_DEVMEM_IS_ALLOWED
73 select ARCH_HAS_DMA_OPS if PCI
74 select ARCH_HAS_ELF_RANDOMIZE
75 select ARCH_HAS_FORCE_DMA_UNENCRYPTED
76 select ARCH_HAS_FORTIFY_SOURCE
77 select ARCH_HAS_GCOV_PROFILE_ALL
78 select ARCH_HAS_GIGANTIC_PAGE
79 select ARCH_HAS_KCOV
80 select ARCH_HAS_MEMBARRIER_SYNC_CORE
81 select ARCH_HAS_MEM_ENCRYPT
82 select ARCH_HAS_NMI_SAFE_THIS_CPU_OPS
83 select ARCH_HAS_PTE_SPECIAL
84 select ARCH_HAS_SCALED_CPUTIME
85 select ARCH_HAS_SET_DIRECT_MAP
86 select ARCH_HAS_SET_MEMORY
87 select ARCH_HAS_STRICT_KERNEL_RWX
88 select ARCH_HAS_STRICT_MODULE_RWX
89 select ARCH_HAS_SYSCALL_WRAPPER
90 select ARCH_HAS_UBSAN
91 select ARCH_HAS_VDSO_DATA
92 select ARCH_HAVE_NMI_SAFE_CMPXCHG
93 select ARCH_INLINE_READ_LOCK
94 select ARCH_INLINE_READ_LOCK_BH
95 select ARCH_INLINE_READ_LOCK_IRQ
96 select ARCH_INLINE_READ_LOCK_IRQSAVE
97 select ARCH_INLINE_READ_TRYLOCK
98 select ARCH_INLINE_READ_UNLOCK
99 select ARCH_INLINE_READ_UNLOCK_BH
100 select ARCH_INLINE_READ_UNLOCK_IRQ
101 select ARCH_INLINE_READ_UNLOCK_IRQREST
102 select ARCH_INLINE_SPIN_LOCK
103 select ARCH_INLINE_SPIN_LOCK_BH
104 select ARCH_INLINE_SPIN_LOCK_IRQ
105 select ARCH_INLINE_SPIN_LOCK_IRQSAVE
106 select ARCH_INLINE_SPIN_TRYLOCK
107 select ARCH_INLINE_SPIN_TRYLOCK_BH
108 select ARCH_INLINE_SPIN_UNLOCK
109 select ARCH_INLINE_SPIN_UNLOCK_BH
110 select ARCH_INLINE_SPIN_UNLOCK_IRQ
111 select ARCH_INLINE_SPIN_UNLOCK_IRQREST
112 select ARCH_INLINE_WRITE_LOCK
113 select ARCH_INLINE_WRITE_LOCK_BH
114 select ARCH_INLINE_WRITE_LOCK_IRQ
115 select ARCH_INLINE_WRITE_LOCK_IRQSAVE
116 select ARCH_INLINE_WRITE_TRYLOCK
117 select ARCH_INLINE_WRITE_UNLOCK
118 select ARCH_INLINE_WRITE_UNLOCK_BH
119 select ARCH_INLINE_WRITE_UNLOCK_IRQ
120 select ARCH_INLINE_WRITE_UNLOCK_IRQRES
121 select ARCH_MHP_MEMMAP_ON_MEMORY_ENABL
122 select ARCH_STACKWALK
123 select ARCH_SUPPORTS_ATOMIC_RMW
124 select ARCH_SUPPORTS_DEBUG_PAGEALLOC
125 select ARCH_SUPPORTS_HUGETLBFS
126 select ARCH_SUPPORTS_INT128 if CC_HAS_
127 select ARCH_SUPPORTS_NUMA_BALANCING
128 select ARCH_SUPPORTS_PER_VMA_LOCK
129 select ARCH_USE_BUILTIN_BSWAP
130 select ARCH_USE_CMPXCHG_LOCKREF
131 select ARCH_USE_SYM_ANNOTATIONS
132 select ARCH_WANTS_NO_INSTR
133 select ARCH_WANT_DEFAULT_BPF_JIT
134 select ARCH_WANT_IPC_PARSE_VERSION
135 select ARCH_WANT_KERNEL_PMD_MKWRITE
136 select ARCH_WANT_LD_ORPHAN_WARN
137 select ARCH_WANT_OPTIMIZE_HUGETLB_VMEM
138 select BUILDTIME_TABLE_SORT
139 select CLONE_BACKWARDS2
140 select DCACHE_WORD_ACCESS if !KMSAN
141 select DYNAMIC_FTRACE if FUNCTION_TRAC
142 select FUNCTION_ALIGNMENT_8B if CC_IS_
143 select FUNCTION_ALIGNMENT_16B if !CC_I
144 select GENERIC_ALLOCATOR
145 select GENERIC_CPU_DEVICES
146 select GENERIC_CPU_AUTOPROBE
147 select GENERIC_CPU_VULNERABILITIES
148 select GENERIC_ENTRY
149 select GENERIC_GETTIMEOFDAY
150 select GENERIC_PTDUMP
151 select GENERIC_SMP_IDLE_THREAD
152 select GENERIC_TIME_VSYSCALL
153 select GENERIC_VDSO_TIME_NS
154 select GENERIC_IOREMAP if PCI
155 select HAVE_ALIGNED_STRUCT_PAGE
156 select HAVE_ARCH_AUDITSYSCALL
157 select HAVE_ARCH_JUMP_LABEL
158 select HAVE_ARCH_JUMP_LABEL_RELATIVE
159 select HAVE_ARCH_KASAN
160 select HAVE_ARCH_KASAN_VMALLOC
161 select HAVE_ARCH_KCSAN
162 select HAVE_ARCH_KMSAN
163 select HAVE_ARCH_KFENCE
164 select HAVE_ARCH_RANDOMIZE_KSTACK_OFFS
165 select HAVE_ARCH_SECCOMP_FILTER
166 select HAVE_ARCH_SOFT_DIRTY
167 select HAVE_ARCH_STACKLEAK
168 select HAVE_ARCH_TRACEHOOK
169 select HAVE_ARCH_TRANSPARENT_HUGEPAGE
170 select HAVE_ARCH_VMAP_STACK
171 select HAVE_ASM_MODVERSIONS
172 select HAVE_CMPXCHG_DOUBLE
173 select HAVE_CMPXCHG_LOCAL
174 select HAVE_DEBUG_KMEMLEAK
175 select HAVE_DMA_CONTIGUOUS
176 select HAVE_DYNAMIC_FTRACE
177 select HAVE_DYNAMIC_FTRACE_WITH_ARGS
178 select HAVE_DYNAMIC_FTRACE_WITH_DIRECT
179 select HAVE_DYNAMIC_FTRACE_WITH_REGS
180 select HAVE_EBPF_JIT if HAVE_MARCH_Z19
181 select HAVE_EFFICIENT_UNALIGNED_ACCESS
182 select HAVE_GUP_FAST
183 select HAVE_FENTRY
184 select HAVE_FTRACE_MCOUNT_RECORD
185 select HAVE_FUNCTION_ARG_ACCESS_API
186 select HAVE_FUNCTION_ERROR_INJECTION
187 select HAVE_FUNCTION_GRAPH_RETVAL
188 select HAVE_FUNCTION_GRAPH_TRACER
189 select HAVE_FUNCTION_TRACER
190 select HAVE_GCC_PLUGINS
191 select HAVE_GENERIC_VDSO
192 select HAVE_IOREMAP_PROT if PCI
193 select HAVE_KERNEL_BZIP2
194 select HAVE_KERNEL_GZIP
195 select HAVE_KERNEL_LZ4
196 select HAVE_KERNEL_LZMA
197 select HAVE_KERNEL_LZO
198 select HAVE_KERNEL_UNCOMPRESSED
199 select HAVE_KERNEL_XZ
200 select HAVE_KERNEL_ZSTD
201 select HAVE_KPROBES
202 select HAVE_KPROBES_ON_FTRACE
203 select HAVE_KRETPROBES
204 select HAVE_LIVEPATCH
205 select HAVE_MEMBLOCK_PHYS_MAP
206 select HAVE_MOD_ARCH_SPECIFIC
207 select HAVE_NMI
208 select HAVE_NOP_MCOUNT
209 select HAVE_PAGE_SIZE_4KB
210 select HAVE_PCI
211 select HAVE_PERF_EVENTS
212 select HAVE_PERF_REGS
213 select HAVE_PERF_USER_STACK_DUMP
214 select HAVE_REGS_AND_STACK_ACCESS_API
215 select HAVE_RELIABLE_STACKTRACE
216 select HAVE_RETHOOK
217 select HAVE_RSEQ
218 select HAVE_SAMPLE_FTRACE_DIRECT
219 select HAVE_SAMPLE_FTRACE_DIRECT_MULTI
220 select HAVE_SETUP_PER_CPU_AREA
221 select HAVE_SOFTIRQ_ON_OWN_STACK
222 select HAVE_SYSCALL_TRACEPOINTS
223 select HAVE_VIRT_CPU_ACCOUNTING
224 select HAVE_VIRT_CPU_ACCOUNTING_IDLE
225 select IOMMU_HELPER if PCI
226 select IOMMU_SUPPORT if PCI
227 select MMU_GATHER_MERGE_VMAS
228 select MMU_GATHER_NO_GATHER
229 select MMU_GATHER_RCU_TABLE_FREE
230 select MODULES_USE_ELF_RELA
231 select NEED_DMA_MAP_STATE if PCI
232 select NEED_PER_CPU_EMBED_FIRST_CHUNK
233 select NEED_SG_DMA_LENGTH if PCI
234 select OLD_SIGACTION
235 select OLD_SIGSUSPEND3
236 select PCI_DOMAINS if PCI
237 select PCI_MSI if PCI
238 select PCI_MSI_ARCH_FALLBACKS if PCI
239 select SPARSE_IRQ
240 select SWIOTLB
241 select SYSCTL_EXCEPTION_TRACE
242 select THREAD_INFO_IN_TASK
243 select TRACE_IRQFLAGS_SUPPORT
244 select TTY
245 select USER_STACKTRACE_SUPPORT
246 select VDSO_GETRANDOM
247 select VIRT_CPU_ACCOUNTING
248 select ZONE_DMA
249 # Note: keep the above list sorted alp
250
251 config SCHED_OMIT_FRAME_POINTER
252 def_bool y
253
254 config PGTABLE_LEVELS
255 int
256 default 5
257
258 source "kernel/livepatch/Kconfig"
259
260 config ARCH_SUPPORTS_KEXEC
261 def_bool y
262
263 config ARCH_SUPPORTS_KEXEC_FILE
264 def_bool y
265
266 config ARCH_SUPPORTS_KEXEC_SIG
267 def_bool MODULE_SIG_FORMAT
268
269 config ARCH_SUPPORTS_KEXEC_PURGATORY
270 def_bool y
271
272 config ARCH_SUPPORTS_CRASH_DUMP
273 def_bool y
274 help
275 Refer to <file:Documentation/arch/s3
276 This option also enables s390 zfcpdu
277 See also <file:Documentation/arch/s3
278
279 menu "Processor type and features"
280
281 config HAVE_MARCH_Z10_FEATURES
282 def_bool n
283
284 config HAVE_MARCH_Z196_FEATURES
285 def_bool n
286 select HAVE_MARCH_Z10_FEATURES
287
288 config HAVE_MARCH_ZEC12_FEATURES
289 def_bool n
290 select HAVE_MARCH_Z196_FEATURES
291
292 config HAVE_MARCH_Z13_FEATURES
293 def_bool n
294 select HAVE_MARCH_ZEC12_FEATURES
295
296 config HAVE_MARCH_Z14_FEATURES
297 def_bool n
298 select HAVE_MARCH_Z13_FEATURES
299
300 config HAVE_MARCH_Z15_FEATURES
301 def_bool n
302 select HAVE_MARCH_Z14_FEATURES
303
304 config HAVE_MARCH_Z16_FEATURES
305 def_bool n
306 select HAVE_MARCH_Z15_FEATURES
307
308 choice
309 prompt "Processor type"
310 default MARCH_Z196
311
312 config MARCH_Z10
313 bool "IBM System z10"
314 select HAVE_MARCH_Z10_FEATURES
315 depends on $(cc-option,-march=z10)
316 help
317 Select this to enable optimizations
318 series). This is the oldest machine
319
320 config MARCH_Z196
321 bool "IBM zEnterprise 114 and 196"
322 select HAVE_MARCH_Z196_FEATURES
323 depends on $(cc-option,-march=z196)
324 help
325 Select this to enable optimizations
326 (2818 and 2817 series). The kernel w
327 not work on older machines.
328
329 config MARCH_ZEC12
330 bool "IBM zBC12 and zEC12"
331 select HAVE_MARCH_ZEC12_FEATURES
332 depends on $(cc-option,-march=zEC12)
333 help
334 Select this to enable optimizations
335 2827 series). The kernel will be sli
336 older machines.
337
338 config MARCH_Z13
339 bool "IBM z13s and z13"
340 select HAVE_MARCH_Z13_FEATURES
341 depends on $(cc-option,-march=z13)
342 help
343 Select this to enable optimizations
344 2964 series). The kernel will be sli
345 older machines.
346
347 config MARCH_Z14
348 bool "IBM z14 ZR1 and z14"
349 select HAVE_MARCH_Z14_FEATURES
350 depends on $(cc-option,-march=z14)
351 help
352 Select this to enable optimizations
353 and 3906 series). The kernel will be
354 work on older machines.
355
356 config MARCH_Z15
357 bool "IBM z15"
358 select HAVE_MARCH_Z15_FEATURES
359 depends on $(cc-option,-march=z15)
360 help
361 Select this to enable optimizations
362 and 8561 series). The kernel will be
363 work on older machines.
364
365 config MARCH_Z16
366 bool "IBM z16"
367 select HAVE_MARCH_Z16_FEATURES
368 depends on $(cc-option,-march=z16)
369 help
370 Select this to enable optimizations
371 3932 series).
372
373 endchoice
374
375 config MARCH_Z10_TUNE
376 def_bool TUNE_Z10 || MARCH_Z10 && TUNE
377
378 config MARCH_Z196_TUNE
379 def_bool TUNE_Z196 || MARCH_Z196 && TU
380
381 config MARCH_ZEC12_TUNE
382 def_bool TUNE_ZEC12 || MARCH_ZEC12 &&
383
384 config MARCH_Z13_TUNE
385 def_bool TUNE_Z13 || MARCH_Z13 && TUNE
386
387 config MARCH_Z14_TUNE
388 def_bool TUNE_Z14 || MARCH_Z14 && TUNE
389
390 config MARCH_Z15_TUNE
391 def_bool TUNE_Z15 || MARCH_Z15 && TUNE
392
393 config MARCH_Z16_TUNE
394 def_bool TUNE_Z16 || MARCH_Z16 && TUNE
395
396 choice
397 prompt "Tune code generation"
398 default TUNE_DEFAULT
399 help
400 Cause the compiler to tune (-mtune)
401 This will make the code run faster o
402 somewhat slower on other machines.
403 This option only changes how the com
404 selection of instructions itself, so
405 all other machines.
406
407 config TUNE_DEFAULT
408 bool "Default"
409 help
410 Tune the generated code for the targ
411 will be compiled.
412
413 config TUNE_Z10
414 bool "IBM System z10"
415
416 config TUNE_Z196
417 bool "IBM zEnterprise 114 and 196"
418 depends on $(cc-option,-mtune=z196)
419
420 config TUNE_ZEC12
421 bool "IBM zBC12 and zEC12"
422 depends on $(cc-option,-mtune=zEC12)
423
424 config TUNE_Z13
425 bool "IBM z13s and z13"
426 depends on $(cc-option,-mtune=z13)
427
428 config TUNE_Z14
429 bool "IBM z14 ZR1 and z14"
430 depends on $(cc-option,-mtune=z14)
431
432 config TUNE_Z15
433 bool "IBM z15"
434 depends on $(cc-option,-mtune=z15)
435
436 config TUNE_Z16
437 bool "IBM z16"
438 depends on $(cc-option,-mtune=z16)
439
440 endchoice
441
442 config 64BIT
443 def_bool y
444
445 config COMMAND_LINE_SIZE
446 int "Maximum size of kernel command li
447 default 4096
448 range 896 1048576
449 help
450 This allows you to specify the maxim
451 line.
452
453 config COMPAT
454 def_bool n
455 prompt "Kernel support for 31 bit emul
456 select ARCH_WANT_OLD_COMPAT_IPC
457 select COMPAT_OLD_SIGACTION
458 select HAVE_UID16
459 depends on MULTIUSER
460 depends on !CC_IS_CLANG && !LD_IS_LLD
461 help
462 Select this option if you want to en
463 handle system-calls from ELF binarie
464 (and some other stuff like libraries
465 executing 31 bit applications.
466
467 If unsure say N.
468
469 config SMP
470 def_bool y
471
472 config NR_CPUS
473 int "Maximum number of CPUs (2-512)"
474 range 2 512
475 default "64"
476 help
477 This allows you to specify the maxim
478 kernel will support. The maximum sup
479 minimum value which makes sense is 2
480
481 This is purely to save memory - each
482 approximately sixteen kilobytes to t
483
484 config HOTPLUG_CPU
485 def_bool y
486
487 config NUMA
488 bool "NUMA support"
489 depends on SCHED_TOPOLOGY
490 default n
491 help
492 Enable NUMA support
493
494 This option adds NUMA support to the
495
496 config NODES_SHIFT
497 int
498 depends on NUMA
499 default "1"
500
501 config SCHED_SMT
502 def_bool n
503
504 config SCHED_MC
505 def_bool n
506
507 config SCHED_TOPOLOGY
508 def_bool y
509 prompt "Topology scheduler support"
510 select SCHED_SMT
511 select SCHED_MC
512 help
513 Topology scheduler support improves
514 making when dealing with machines th
515 multiple cores or multiple books.
516
517 config SCHED_TOPOLOGY_VERTICAL
518 def_bool y
519 bool "Use vertical CPU polarization by
520 depends on SCHED_TOPOLOGY
521 help
522 Use vertical CPU polarization by def
523 The default CPU polarization is hori
524
525 config HIPERDISPATCH_ON
526 def_bool y
527 bool "Use hiperdispatch on vertical po
528 depends on SCHED_TOPOLOGY
529 depends on PROC_SYSCTL
530 help
531 Hiperdispatch aims to improve the CP
532 making when using vertical polarizat
533 capacities dynamically. Set this opt
534 on vertical polarization by default.
535 by sysctl's s390.hiperdispatch attri
536
537 source "kernel/Kconfig.hz"
538
539 config CERT_STORE
540 bool "Get user certificates via DIAG32
541 depends on KEYS
542 select CRYPTO_LIB_SHA256
543 help
544 Enable this option if you want to ac
545 certificates via DIAG 0x320.
546
547 These certificates will be made avai
548 'cert_store'.
549
550 config KERNEL_NOBP
551 def_bool n
552 prompt "Enable modified branch predict
553 help
554 If this option is selected the kerne
555 branch prediction mode if the firmwa
556 The modified branch prediction mode
557 regard to speculative execution.
558
559 With the option enabled the kernel p
560 can be used to run the kernel in the
561
562 With the option disabled the modifie
563 enabled with the "nobp=1" kernel par
564
565 If unsure, say N.
566
567 config EXPOLINE
568 def_bool n
569 depends on $(cc-option,-mindirect-bran
570 prompt "Avoid speculative indirect bra
571 help
572 Compile the kernel with the expoline
573 against kernel-to-user data leaks by
574 branches.
575 Requires a compiler with -mindirect-
576 protection. The kernel may run slowe
577
578 If unsure, say N.
579
580 config EXPOLINE_EXTERN
581 def_bool EXPOLINE && CC_IS_GCC && GCC_
582 $(success,$(srctree)/arch/s39
583 help
584 Generate expolines as external funct
585 This option is required for some too
586 are enabled. The kernel is compiled
587 -mindirect-branch=thunk-extern, whic
588
589 choice
590 prompt "Expoline default"
591 depends on EXPOLINE
592 default EXPOLINE_FULL
593
594 config EXPOLINE_OFF
595 bool "spectre_v2=off"
596
597 config EXPOLINE_AUTO
598 bool "spectre_v2=auto"
599
600 config EXPOLINE_FULL
601 bool "spectre_v2=on"
602
603 endchoice
604
605 config RELOCATABLE
606 def_bool y
607 help
608 This builds a kernel image that reta
609 so it can be loaded at an arbitrary
610 The relocations make the kernel imag
611 10%), but are discarded at runtime.
612 Note: this option exists only for do
613 not remove it.
614
615 config RANDOMIZE_BASE
616 bool "Randomize the address of the ker
617 default y
618 help
619 In support of Kernel Address Space L
620 this randomizes the address at which
621 as a security feature that deters ex
622 knowledge of the location of kernel
623
624 config RANDOMIZE_IDENTITY_BASE
625 bool "Randomize the address of the ide
626 depends on RANDOMIZE_BASE
627 default DEBUG_VM
628 help
629 The identity mapping base address is
630 Allow randomization of that base to
631 notion of physical and virtual addre
632 That does not have any impact on the
633 kernel image is loaded.
634
635 If unsure, say N
636
637 config KERNEL_IMAGE_BASE
638 hex "Kernel image base address"
639 range 0x100000 0x1FFFFFE0000000 if !KA
640 range 0x100000 0x1BFFFFE0000000 if KAS
641 default 0x3FFE0000000 if !KASAN
642 default 0x7FFFE0000000 if KASAN
643 help
644 This is the address at which the ker
645 Kernel Address Space Layout Randomiz
646
647 In case the Protected virtualization
648 Ultravisor imposes a virtual address
649 option leads to the kernel image exc
650 this option is ignored and the image
651
652 If the value of this option leads to
653 the virtual memory where other data
654 option is ignored and the image is l
655
656 endmenu
657
658 menu "Memory setup"
659
660 config ARCH_SPARSEMEM_ENABLE
661 def_bool y
662 select SPARSEMEM_VMEMMAP_ENABLE
663 select SPARSEMEM_VMEMMAP
664
665 config ARCH_SPARSEMEM_DEFAULT
666 def_bool y
667
668 config MAX_PHYSMEM_BITS
669 int "Maximum size of supported physica
670 range 42 53
671 default "46"
672 help
673 This option specifies the maximum su
674 in bits. Supported is any size betwe
675 Increasing the number of bits also i
676 By default 46 bits (64TB) are suppor
677
678 config CHECK_STACK
679 def_bool y
680 depends on !VMAP_STACK
681 prompt "Detect kernel stack overflow"
682 help
683 This option enables the compiler opt
684 -mstack-size if they are available.
685 it will emit additional code to each
686 an illegal operation if the kernel s
687
688 Say N if you are unsure.
689
690 config STACK_GUARD
691 int "Size of the guard area (128-1024)
692 range 128 1024
693 depends on CHECK_STACK
694 default "256"
695 help
696 This allows you to specify the size
697 end of the kernel stack. If the kern
698 area on function entry an illegal op
699 needs to be a power of 2. Please kee
700 interrupt frame is 184 bytes for 31
701 The minimum size for the stack guard
702 512 for 64 bit.
703
704 endmenu
705
706 menu "I/O subsystem"
707
708 config QDIO
709 def_tristate y
710 prompt "QDIO support"
711 help
712 This driver provides the Queued Dire
713 IBM System z.
714
715 To compile this driver as a module,
716 module will be called qdio.
717
718 If unsure, say Y.
719
720 if PCI
721
722 config PCI_NR_FUNCTIONS
723 int "Maximum number of PCI functions (
724 range 1 4096
725 default "512"
726 help
727 This allows you to specify the maxim
728 this kernel will support.
729
730 endif # PCI
731
732 config HAS_IOMEM
733 def_bool PCI
734
735 config CHSC_SCH
736 def_tristate m
737 prompt "Support for CHSC subchannels"
738 help
739 This driver allows usage of CHSC sub
740 is usually present on LPAR only.
741 The driver creates a device /dev/chs
742 obtain I/O configuration information
743 to issue asynchronous chsc commands
744 You will usually only want to use th
745 LPAR designated for system managemen
746
747 To compile this driver as a module,
748 module will be called chsc_sch.
749
750 If unsure, say N.
751
752 config SCM_BUS
753 def_bool y
754 prompt "SCM bus driver"
755 help
756 Bus driver for Storage Class Memory.
757
758 config EADM_SCH
759 def_tristate m
760 prompt "Support for EADM subchannels"
761 depends on SCM_BUS
762 help
763 This driver allows usage of EADM sub
764 as a communication vehicle for SCM i
765
766 To compile this driver as a module,
767 module will be called eadm_sch.
768
769 config AP
770 def_tristate y
771 prompt "Support for Adjunct Processors
772 help
773 This driver allows usage to Adjunct
774 the ap bus, cards and queues. Suppor
775 the CryptoExpress Cards (CEX).
776
777 To compile this driver as a module,
778 module will be called ap.
779
780 If unsure, say Y (default).
781
782 config AP_DEBUG
783 def_bool n
784 prompt "Enable debug features for Adju
785 depends on AP
786 help
787 Say 'Y' here to enable some addition
788 Processor (ap) devices.
789
790 There will be some more sysfs attrib
791
792 Do not enable on production level ke
793
794 If unsure, say N.
795
796 config VFIO_CCW
797 def_tristate n
798 prompt "Support for VFIO-CCW subchanne
799 depends on VFIO
800 select VFIO_MDEV
801 help
802 This driver allows usage of I/O subc
803
804 To compile this driver as a module,
805 module will be called vfio_ccw.
806
807 config VFIO_AP
808 def_tristate n
809 prompt "VFIO support for AP devices"
810 depends on KVM
811 depends on VFIO
812 depends on AP
813 select VFIO_MDEV
814 help
815 This driver grants access to Adjunct
816 via the VFIO mediated device interfa
817
818 To compile this driver as a module,
819 will be called vfio_ap.
820
821 endmenu
822
823 config CCW
824 def_bool y
825
826 config HAVE_PNETID
827 tristate
828 default (SMC || CCWGROUP)
829
830 menu "Virtualization"
831
832 config PFAULT
833 def_bool y
834 prompt "Pseudo page fault support"
835 help
836 Select this option, if you want to u
837 handling under VM. If running native
838 has no effect. If your VM does not s
839 pseudo page fault handling will be u
840 Note that VM 4.2 supports PFAULT but
841 implementation that causes some prob
842 Everybody who wants to run Linux und
843 this option.
844
845 config CMM
846 def_tristate n
847 prompt "Cooperative memory management"
848 help
849 Select this option, if you want to e
850 to reduce the memory size of the sys
851 by allocating pages of memory and pu
852 makes sense for a system running und
853 will be reused by VM for other guest
854 allows an external monitor to balanc
855 Everybody who wants to run Linux und
856 option.
857
858 config CMM_IUCV
859 def_bool y
860 prompt "IUCV special message interface
861 depends on CMM && (SMSGIUCV=y || CMM=S
862 help
863 Select this option to enable the spe
864 the cooperative memory management.
865
866 config APPLDATA_BASE
867 def_bool n
868 prompt "Linux - VM Monitor Stream, bas
869 depends on PROC_SYSCTL
870 help
871 This provides a kernel interface for
872 monitor records. The monitor records
873 intervals, once the timer is started
874 Writing 1 or 0 to /proc/appldata/tim
875 i.e. enables or disables monitoring
876 A custom interval value (in seconds)
877 /proc/appldata/interval.
878
879 Defaults are 60 seconds interval and
880 The /proc entries can also be read f
881
882 config APPLDATA_MEM
883 def_tristate m
884 prompt "Monitor memory management stat
885 depends on APPLDATA_BASE && VM_EVENT_C
886 help
887 This provides memory management rela
888 Stream, like paging/swapping rate, m
889 Writing 1 or 0 to /proc/appldata/mem
890 APPLDATA monitor record, i.e. enable
891 on the z/VM side.
892
893 Default is disabled.
894 The /proc entry can also be read fro
895
896 This can also be compiled as a modul
897 appldata_mem.o.
898
899 config APPLDATA_OS
900 def_tristate m
901 prompt "Monitor OS statistics"
902 depends on APPLDATA_BASE
903 help
904 This provides OS related data to the
905 CPU utilisation, etc.
906 Writing 1 or 0 to /proc/appldata/os
907 APPLDATA monitor record, i.e. enable
908 on the z/VM side.
909
910 Default is disabled.
911 This can also be compiled as a modul
912 appldata_os.o.
913
914 config APPLDATA_NET_SUM
915 def_tristate m
916 prompt "Monitor overall network statis
917 depends on APPLDATA_BASE && NET
918 help
919 This provides network related data t
920 currently there is only a total sum
921 per-interface data.
922 Writing 1 or 0 to /proc/appldata/net
923 APPLDATA monitor record, i.e. enable
924 on the z/VM side.
925
926 Default is disabled.
927 This can also be compiled as a modul
928 appldata_net_sum.o.
929
930 config S390_HYPFS
931 def_bool y
932 prompt "s390 hypervisor information"
933 help
934 This provides several binary files a
935 provide accounting information in an
936
937 config S390_HYPFS_FS
938 def_bool n
939 prompt "s390 hypervisor file system su
940 select SYS_HYPERVISOR
941 depends on S390_HYPFS
942 help
943 This is a virtual file system intend
944 information in an s390 hypervisor en
945 is deprecated and should not be used
946
947 Say N if you are unsure.
948
949 source "arch/s390/kvm/Kconfig"
950
951 config S390_GUEST
952 def_bool y
953 prompt "s390 support for virtio device
954 select TTY
955 select VIRTUALIZATION
956 select VIRTIO
957 help
958 Enabling this option adds support fo
959 drivers on s390.
960
961 Select this option if you want to ru
962 the KVM hypervisor.
963
964 endmenu
965
966 config S390_MODULES_SANITY_TEST_HELPERS
967 def_bool n
968
969 menu "Selftests"
970
971 config S390_UNWIND_SELFTEST
972 def_tristate n
973 depends on KUNIT
974 default KUNIT_ALL_TESTS
975 prompt "Test unwind functions"
976 help
977 This option enables s390 specific st
978 module. This option is not useful fo
979 kernels, but only for kernel develop
980
981 Say N if you are unsure.
982
983 config S390_KPROBES_SANITY_TEST
984 def_tristate n
985 prompt "Enable s390 specific kprobes t
986 depends on KPROBES
987 depends on KUNIT
988 help
989 This option enables an s390 specific
990 is not useful for distributions or g
991 developers working on architecture c
992
993 Say N if you are unsure.
994
995 config S390_MODULES_SANITY_TEST
996 def_tristate n
997 depends on KUNIT
998 default KUNIT_ALL_TESTS
999 prompt "Enable s390 specific modules t
1000 select S390_MODULES_SANITY_TEST_HELPE
1001 help
1002 This option enables an s390 specifi
1003 not useful for distributions or gen
1004 kernel developers working on archit
1005
1006 Say N if you are unsure.
1007 endmenu
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