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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 CPU_BIG_ENDIAN
8 def_bool y
9
10config LOCKDEP_SUPPORT
11 def_bool y
12
13config STACKTRACE_SUPPORT
14 def_bool y
15
16config RWSEM_GENERIC_SPINLOCK
17 bool
18
19config RWSEM_XCHGADD_ALGORITHM
20 def_bool y
21
22config ARCH_HAS_ILOG2_U32
23 def_bool n
24
25config ARCH_HAS_ILOG2_U64
26 def_bool n
27
28config GENERIC_HWEIGHT
29 def_bool y
30
31config GENERIC_BUG
32 def_bool y if BUG
33
34config GENERIC_BUG_RELATIVE_POINTERS
35 def_bool y
36
37config ARCH_DMA_ADDR_T_64BIT
38 def_bool y
39
40config GENERIC_LOCKBREAK
41 def_bool y if SMP && PREEMPT
42
43config PGSTE
44 def_bool y if KVM
45
46config ARCH_SUPPORTS_DEBUG_PAGEALLOC
47 def_bool y
48
49config KEXEC
50 def_bool y
51 select KEXEC_CORE
52
53config AUDIT_ARCH
54 def_bool y
55
56config NO_IOPORT_MAP
57 def_bool y
58
59config PCI_QUIRKS
60 def_bool n
61
62config ARCH_SUPPORTS_UPROBES
63 def_bool y
64
65config DEBUG_RODATA
66 def_bool y
67
68config S390
69 def_bool y
70 select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
71 select ARCH_HAS_DEBUG_STRICT_USER_COPY_CHECKS
72 select ARCH_HAS_DEVMEM_IS_ALLOWED
73 select ARCH_HAS_ELF_RANDOMIZE
74 select ARCH_HAS_GCOV_PROFILE_ALL
75 select ARCH_HAS_SG_CHAIN
76 select ARCH_HAVE_NMI_SAFE_CMPXCHG
77 select ARCH_INLINE_READ_LOCK
78 select ARCH_INLINE_READ_LOCK_BH
79 select ARCH_INLINE_READ_LOCK_IRQ
80 select ARCH_INLINE_READ_LOCK_IRQSAVE
81 select ARCH_INLINE_READ_TRYLOCK
82 select ARCH_INLINE_READ_UNLOCK
83 select ARCH_INLINE_READ_UNLOCK_BH
84 select ARCH_INLINE_READ_UNLOCK_IRQ
85 select ARCH_INLINE_READ_UNLOCK_IRQRESTORE
86 select ARCH_INLINE_SPIN_LOCK
87 select ARCH_INLINE_SPIN_LOCK_BH
88 select ARCH_INLINE_SPIN_LOCK_IRQ
89 select ARCH_INLINE_SPIN_LOCK_IRQSAVE
90 select ARCH_INLINE_SPIN_TRYLOCK
91 select ARCH_INLINE_SPIN_TRYLOCK_BH
92 select ARCH_INLINE_SPIN_UNLOCK
93 select ARCH_INLINE_SPIN_UNLOCK_BH
94 select ARCH_INLINE_SPIN_UNLOCK_IRQ
95 select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE
96 select ARCH_INLINE_WRITE_LOCK
97 select ARCH_INLINE_WRITE_LOCK_BH
98 select ARCH_INLINE_WRITE_LOCK_IRQ
99 select ARCH_INLINE_WRITE_LOCK_IRQSAVE
100 select ARCH_INLINE_WRITE_TRYLOCK
101 select ARCH_INLINE_WRITE_UNLOCK
102 select ARCH_INLINE_WRITE_UNLOCK_BH
103 select ARCH_INLINE_WRITE_UNLOCK_IRQ
104 select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE
105 select ARCH_SAVE_PAGE_KEYS if HIBERNATION
106 select ARCH_SUPPORTS_ATOMIC_RMW
107 select ARCH_SUPPORTS_NUMA_BALANCING
108 select ARCH_USE_BUILTIN_BSWAP
109 select ARCH_USE_CMPXCHG_LOCKREF
110 select ARCH_WANTS_PROT_NUMA_PROT_NONE
111 select ARCH_WANT_IPC_PARSE_VERSION
112 select BUILDTIME_EXTABLE_SORT
113 select CLONE_BACKWARDS2
114 select DYNAMIC_FTRACE if FUNCTION_TRACER
115 select GENERIC_CLOCKEVENTS
116 select GENERIC_CPU_AUTOPROBE
117 select GENERIC_CPU_DEVICES if !SMP
118 select GENERIC_FIND_FIRST_BIT
119 select GENERIC_SMP_IDLE_THREAD
120 select GENERIC_TIME_VSYSCALL
121 select HAVE_ALIGNED_STRUCT_PAGE if SLUB
122 select HAVE_ARCH_AUDITSYSCALL
123 select HAVE_ARCH_EARLY_PFN_TO_NID
124 select HAVE_ARCH_JUMP_LABEL
125 select HAVE_ARCH_SECCOMP_FILTER
126 select HAVE_ARCH_SOFT_DIRTY
127 select HAVE_ARCH_TRACEHOOK
128 select HAVE_ARCH_TRANSPARENT_HUGEPAGE
129 select HAVE_BPF_JIT if PACK_STACK && HAVE_MARCH_Z196_FEATURES
130 select HAVE_CMPXCHG_DOUBLE
131 select HAVE_CMPXCHG_LOCAL
132 select HAVE_DEBUG_KMEMLEAK
133 select HAVE_DMA_API_DEBUG
134 select HAVE_DYNAMIC_FTRACE
135 select HAVE_DYNAMIC_FTRACE_WITH_REGS
136 select HAVE_FTRACE_MCOUNT_RECORD
137 select HAVE_FUNCTION_GRAPH_TRACER
138 select HAVE_FUNCTION_TRACER
139 select HAVE_FUTEX_CMPXCHG if FUTEX
140 select HAVE_KERNEL_BZIP2
141 select HAVE_KERNEL_GZIP
142 select HAVE_KERNEL_LZ4
143 select HAVE_KERNEL_LZMA
144 select HAVE_KERNEL_LZO
145 select HAVE_KERNEL_XZ
146 select HAVE_KPROBES
147 select HAVE_KRETPROBES
148 select HAVE_KVM
149 select HAVE_LIVEPATCH
150 select HAVE_MEMBLOCK
151 select HAVE_MEMBLOCK_NODE_MAP
152 select HAVE_MEMBLOCK_PHYS_MAP
153 select HAVE_MOD_ARCH_SPECIFIC
154 select HAVE_OPROFILE
155 select HAVE_PERF_EVENTS
156 select HAVE_REGS_AND_STACK_ACCESS_API
157 select HAVE_SYSCALL_TRACEPOINTS
158 select HAVE_VIRT_CPU_ACCOUNTING
159 select MODULES_USE_ELF_RELA
160 select NO_BOOTMEM
161 select OLD_SIGACTION
162 select OLD_SIGSUSPEND3
163 select SYSCTL_EXCEPTION_TRACE
164 select TTY
165 select VIRT_CPU_ACCOUNTING
166 select VIRT_TO_BUS
167
168
169config SCHED_OMIT_FRAME_POINTER
170 def_bool y
171
172config PGTABLE_LEVELS
173 int
174 default 4
175
176source "init/Kconfig"
177
178source "kernel/Kconfig.freezer"
179
180source "kernel/livepatch/Kconfig"
181
182menu "Processor type and features"
183
184config HAVE_MARCH_Z900_FEATURES
185 def_bool n
186
187config HAVE_MARCH_Z990_FEATURES
188 def_bool n
189 select HAVE_MARCH_Z900_FEATURES
190
191config HAVE_MARCH_Z9_109_FEATURES
192 def_bool n
193 select HAVE_MARCH_Z990_FEATURES
194
195config HAVE_MARCH_Z10_FEATURES
196 def_bool n
197 select HAVE_MARCH_Z9_109_FEATURES
198
199config HAVE_MARCH_Z196_FEATURES
200 def_bool n
201 select HAVE_MARCH_Z10_FEATURES
202
203config HAVE_MARCH_ZEC12_FEATURES
204 def_bool n
205 select HAVE_MARCH_Z196_FEATURES
206
207config HAVE_MARCH_Z13_FEATURES
208 def_bool n
209 select HAVE_MARCH_ZEC12_FEATURES
210
211choice
212 prompt "Processor type"
213 default MARCH_Z900
214
215config MARCH_Z900
216 bool "IBM zSeries model z800 and z900"
217 select HAVE_MARCH_Z900_FEATURES
218 help
219 Select this to enable optimizations for model z800/z900 (2064 and
220 2066 series). This will enable some optimizations that are not
221 available on older ESA/390 (31 Bit) only CPUs.
222
223config MARCH_Z990
224 bool "IBM zSeries model z890 and z990"
225 select HAVE_MARCH_Z990_FEATURES
226 help
227 Select this to enable optimizations for model z890/z990 (2084 and
228 2086 series). The kernel will be slightly faster but will not work
229 on older machines.
230
231config MARCH_Z9_109
232 bool "IBM System z9"
233 select HAVE_MARCH_Z9_109_FEATURES
234 help
235 Select this to enable optimizations for IBM System z9 (2094 and
236 2096 series). The kernel will be slightly faster but will not work
237 on older machines.
238
239config MARCH_Z10
240 bool "IBM System z10"
241 select HAVE_MARCH_Z10_FEATURES
242 help
243 Select this to enable optimizations for IBM System z10 (2097 and
244 2098 series). The kernel will be slightly faster but will not work
245 on older machines.
246
247config MARCH_Z196
248 bool "IBM zEnterprise 114 and 196"
249 select HAVE_MARCH_Z196_FEATURES
250 help
251 Select this to enable optimizations for IBM zEnterprise 114 and 196
252 (2818 and 2817 series). The kernel will be slightly faster but will
253 not work on older machines.
254
255config MARCH_ZEC12
256 bool "IBM zBC12 and zEC12"
257 select HAVE_MARCH_ZEC12_FEATURES
258 help
259 Select this to enable optimizations for IBM zBC12 and zEC12 (2828 and
260 2827 series). The kernel will be slightly faster but will not work on
261 older machines.
262
263config MARCH_Z13
264 bool "IBM z13s and z13"
265 select HAVE_MARCH_Z13_FEATURES
266 help
267 Select this to enable optimizations for IBM z13s and z13 (2965 and
268 2964 series). The kernel will be slightly faster but will not work on
269 older machines.
270
271endchoice
272
273config MARCH_Z900_TUNE
274 def_bool TUNE_Z900 || MARCH_Z900 && TUNE_DEFAULT
275
276config MARCH_Z990_TUNE
277 def_bool TUNE_Z990 || MARCH_Z990 && TUNE_DEFAULT
278
279config MARCH_Z9_109_TUNE
280 def_bool TUNE_Z9_109 || MARCH_Z9_109 && TUNE_DEFAULT
281
282config MARCH_Z10_TUNE
283 def_bool TUNE_Z10 || MARCH_Z10 && TUNE_DEFAULT
284
285config MARCH_Z196_TUNE
286 def_bool TUNE_Z196 || MARCH_Z196 && TUNE_DEFAULT
287
288config MARCH_ZEC12_TUNE
289 def_bool TUNE_ZEC12 || MARCH_ZEC12 && TUNE_DEFAULT
290
291config MARCH_Z13_TUNE
292 def_bool TUNE_Z13 || MARCH_Z13 && TUNE_DEFAULT
293
294choice
295 prompt "Tune code generation"
296 default TUNE_DEFAULT
297 help
298 Cause the compiler to tune (-mtune) the generated code for a machine.
299 This will make the code run faster on the selected machine but
300 somewhat slower on other machines.
301 This option only changes how the compiler emits instructions, not the
302 selection of instructions itself, so the resulting kernel will run on
303 all other machines.
304
305config TUNE_DEFAULT
306 bool "Default"
307 help
308 Tune the generated code for the target processor for which the kernel
309 will be compiled.
310
311config TUNE_Z900
312 bool "IBM zSeries model z800 and z900"
313
314config TUNE_Z990
315 bool "IBM zSeries model z890 and z990"
316
317config TUNE_Z9_109
318 bool "IBM System z9"
319
320config TUNE_Z10
321 bool "IBM System z10"
322
323config TUNE_Z196
324 bool "IBM zEnterprise 114 and 196"
325
326config TUNE_ZEC12
327 bool "IBM zBC12 and zEC12"
328
329config TUNE_Z13
330 bool "IBM z13"
331
332endchoice
333
334config 64BIT
335 def_bool y
336
337config COMPAT
338 def_bool y
339 prompt "Kernel support for 31 bit emulation"
340 select COMPAT_BINFMT_ELF if BINFMT_ELF
341 select ARCH_WANT_OLD_COMPAT_IPC
342 select COMPAT_OLD_SIGACTION
343 depends on MULTIUSER
344 help
345 Select this option if you want to enable your system kernel to
346 handle system-calls from ELF binaries for 31 bit ESA. This option
347 (and some other stuff like libraries and such) is needed for
348 executing 31 bit applications. It is safe to say "Y".
349
350config SYSVIPC_COMPAT
351 def_bool y if COMPAT && SYSVIPC
352
353config KEYS_COMPAT
354 def_bool y if COMPAT && KEYS
355
356config SMP
357 def_bool y
358 prompt "Symmetric multi-processing support"
359 ---help---
360 This enables support for systems with more than one CPU. If you have
361 a system with only one CPU, like most personal computers, say N. If
362 you have a system with more than one CPU, say Y.
363
364 If you say N here, the kernel will run on uni- and multiprocessor
365 machines, but will use only one CPU of a multiprocessor machine. If
366 you say Y here, the kernel will run on many, but not all,
367 uniprocessor machines. On a uniprocessor machine, the kernel
368 will run faster if you say N here.
369
370 See also the SMP-HOWTO available at
371 <http://www.tldp.org/docs.html#howto>.
372
373 Even if you don't know what to do here, say Y.
374
375config NR_CPUS
376 int "Maximum number of CPUs (2-512)"
377 range 2 512
378 depends on SMP
379 default "64"
380 help
381 This allows you to specify the maximum number of CPUs which this
382 kernel will support. The maximum supported value is 512 and the
383 minimum value which makes sense is 2.
384
385 This is purely to save memory - each supported CPU adds
386 approximately sixteen kilobytes to the kernel image.
387
388config HOTPLUG_CPU
389 def_bool y
390 prompt "Support for hot-pluggable CPUs"
391 depends on SMP
392 help
393 Say Y here to be able to turn CPUs off and on. CPUs
394 can be controlled through /sys/devices/system/cpu/cpu#.
395 Say N if you want to disable CPU hotplug.
396
397# Some NUMA nodes have memory ranges that span
398# other nodes. Even though a pfn is valid and
399# between a node's start and end pfns, it may not
400# reside on that node. See memmap_init_zone()
401# for details. <- They meant memory holes!
402config NODES_SPAN_OTHER_NODES
403 def_bool NUMA
404
405config NUMA
406 bool "NUMA support"
407 depends on SMP && SCHED_TOPOLOGY
408 default n
409 help
410 Enable NUMA support
411
412 This option adds NUMA support to the kernel.
413
414 An operation mode can be selected by appending
415 numa=<method> to the kernel command line.
416
417 The default behaviour is identical to appending numa=plain to
418 the command line. This will create just one node with all
419 available memory and all CPUs in it.
420
421config NODES_SHIFT
422 int "Maximum NUMA nodes (as a power of 2)"
423 range 1 10
424 depends on NUMA
425 default "4"
426 help
427 Specify the maximum number of NUMA nodes available on the target
428 system. Increases memory reserved to accommodate various tables.
429
430menu "Select NUMA modes"
431 depends on NUMA
432
433config NUMA_EMU
434 bool "NUMA emulation"
435 default y
436 help
437 Numa emulation mode will split the available system memory into
438 equal chunks which then are distributed over the configured number
439 of nodes in a round-robin manner.
440
441 The number of fake nodes is limited by the number of available memory
442 chunks (i.e. memory size / fake size) and the number of supported
443 nodes in the kernel.
444
445 The CPUs are assigned to the nodes in a way that partially respects
446 the original machine topology (if supported by the machine).
447 Fair distribution of the CPUs is not guaranteed.
448
449config EMU_SIZE
450 hex "NUMA emulation memory chunk size"
451 default 0x10000000
452 range 0x400000 0x100000000
453 depends on NUMA_EMU
454 help
455 Select the default size by which the memory is chopped and then
456 assigned to emulated NUMA nodes.
457
458 This can be overridden by specifying
459
460 emu_size=<n>
461
462 on the kernel command line where also suffixes K, M, G, and T are
463 supported.
464
465endmenu
466
467config SCHED_SMT
468 def_bool n
469
470config SCHED_MC
471 def_bool n
472
473config SCHED_BOOK
474 def_bool n
475
476config SCHED_TOPOLOGY
477 def_bool y
478 prompt "Topology scheduler support"
479 depends on SMP
480 select SCHED_SMT
481 select SCHED_MC
482 select SCHED_BOOK
483 help
484 Topology scheduler support improves the CPU scheduler's decision
485 making when dealing with machines that have multi-threading,
486 multiple cores or multiple books.
487
488source kernel/Kconfig.preempt
489
490source kernel/Kconfig.hz
491
492endmenu
493
494menu "Memory setup"
495
496config ARCH_SPARSEMEM_ENABLE
497 def_bool y
498 select SPARSEMEM_VMEMMAP_ENABLE
499 select SPARSEMEM_VMEMMAP
500
501config ARCH_SPARSEMEM_DEFAULT
502 def_bool y
503
504config ARCH_SELECT_MEMORY_MODEL
505 def_bool y
506
507config ARCH_ENABLE_MEMORY_HOTPLUG
508 def_bool y if SPARSEMEM
509
510config ARCH_ENABLE_MEMORY_HOTREMOVE
511 def_bool y
512
513config ARCH_ENABLE_SPLIT_PMD_PTLOCK
514 def_bool y
515
516config FORCE_MAX_ZONEORDER
517 int
518 default "9"
519
520source "mm/Kconfig"
521
522config PACK_STACK
523 def_bool y
524 prompt "Pack kernel stack"
525 help
526 This option enables the compiler option -mkernel-backchain if it
527 is available. If the option is available the compiler supports
528 the new stack layout which dramatically reduces the minimum stack
529 frame size. With an old compiler a non-leaf function needs a
530 minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
531 -mkernel-backchain the minimum size drops to 16 byte on 31 bit
532 and 24 byte on 64 bit.
533
534 Say Y if you are unsure.
535
536config CHECK_STACK
537 def_bool y
538 prompt "Detect kernel stack overflow"
539 help
540 This option enables the compiler option -mstack-guard and
541 -mstack-size if they are available. If the compiler supports them
542 it will emit additional code to each function prolog to trigger
543 an illegal operation if the kernel stack is about to overflow.
544
545 Say N if you are unsure.
546
547config STACK_GUARD
548 int "Size of the guard area (128-1024)"
549 range 128 1024
550 depends on CHECK_STACK
551 default "256"
552 help
553 This allows you to specify the size of the guard area at the lower
554 end of the kernel stack. If the kernel stack points into the guard
555 area on function entry an illegal operation is triggered. The size
556 needs to be a power of 2. Please keep in mind that the size of an
557 interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
558 The minimum size for the stack guard should be 256 for 31 bit and
559 512 for 64 bit.
560
561config WARN_DYNAMIC_STACK
562 def_bool n
563 prompt "Emit compiler warnings for function with dynamic stack usage"
564 help
565 This option enables the compiler option -mwarn-dynamicstack. If the
566 compiler supports this options generates warnings for functions
567 that dynamically allocate stack space using alloca.
568
569 Say N if you are unsure.
570
571endmenu
572
573menu "I/O subsystem"
574
575config QDIO
576 def_tristate y
577 prompt "QDIO support"
578 ---help---
579 This driver provides the Queued Direct I/O base support for
580 IBM System z.
581
582 To compile this driver as a module, choose M here: the
583 module will be called qdio.
584
585 If unsure, say Y.
586
587menuconfig PCI
588 bool "PCI support"
589 select PCI_MSI
590 select IOMMU_SUPPORT
591 help
592 Enable PCI support.
593
594if PCI
595
596config PCI_NR_FUNCTIONS
597 int "Maximum number of PCI functions (1-4096)"
598 range 1 4096
599 default "64"
600 help
601 This allows you to specify the maximum number of PCI functions which
602 this kernel will support.
603
604config PCI_NR_MSI
605 int "Maximum number of MSI interrupts (64-32768)"
606 range 64 32768
607 default "256"
608 help
609 This defines the number of virtual interrupts the kernel will
610 provide for MSI interrupts. If you configure your system to have
611 too few drivers will fail to allocate MSI interrupts for all
612 PCI devices.
613
614source "drivers/pci/Kconfig"
615
616endif # PCI
617
618config PCI_DOMAINS
619 def_bool PCI
620
621config HAS_IOMEM
622 def_bool PCI
623
624config IOMMU_HELPER
625 def_bool PCI
626
627config NEED_SG_DMA_LENGTH
628 def_bool PCI
629
630config NEED_DMA_MAP_STATE
631 def_bool PCI
632
633config CHSC_SCH
634 def_tristate m
635 prompt "Support for CHSC subchannels"
636 help
637 This driver allows usage of CHSC subchannels. A CHSC subchannel
638 is usually present on LPAR only.
639 The driver creates a device /dev/chsc, which may be used to
640 obtain I/O configuration information about the machine and
641 to issue asynchronous chsc commands (DANGEROUS).
642 You will usually only want to use this interface on a special
643 LPAR designated for system management.
644
645 To compile this driver as a module, choose M here: the
646 module will be called chsc_sch.
647
648 If unsure, say N.
649
650config SCM_BUS
651 def_bool y
652 prompt "SCM bus driver"
653 help
654 Bus driver for Storage Class Memory.
655
656config EADM_SCH
657 def_tristate m
658 prompt "Support for EADM subchannels"
659 depends on SCM_BUS
660 help
661 This driver allows usage of EADM subchannels. EADM subchannels act
662 as a communication vehicle for SCM increments.
663
664 To compile this driver as a module, choose M here: the
665 module will be called eadm_sch.
666
667endmenu
668
669menu "Dump support"
670
671config CRASH_DUMP
672 bool "kernel crash dumps"
673 depends on SMP
674 select KEXEC
675 help
676 Generate crash dump after being started by kexec.
677 Crash dump kernels are loaded in the main kernel with kexec-tools
678 into a specially reserved region and then later executed after
679 a crash by kdump/kexec.
680 Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this.
681 This option also enables s390 zfcpdump.
682 See also <file:Documentation/s390/zfcpdump.txt>
683
684endmenu
685
686menu "Executable file formats / Emulations"
687
688source "fs/Kconfig.binfmt"
689
690config SECCOMP
691 def_bool y
692 prompt "Enable seccomp to safely compute untrusted bytecode"
693 depends on PROC_FS
694 help
695 This kernel feature is useful for number crunching applications
696 that may need to compute untrusted bytecode during their
697 execution. By using pipes or other transports made available to
698 the process as file descriptors supporting the read/write
699 syscalls, it's possible to isolate those applications in
700 their own address space using seccomp. Once seccomp is
701 enabled via /proc/<pid>/seccomp, it cannot be disabled
702 and the task is only allowed to execute a few safe syscalls
703 defined by each seccomp mode.
704
705 If unsure, say Y.
706
707endmenu
708
709menu "Power Management"
710
711config ARCH_HIBERNATION_POSSIBLE
712 def_bool y
713
714source "kernel/power/Kconfig"
715
716endmenu
717
718source "net/Kconfig"
719
720config PCMCIA
721 def_bool n
722
723config CCW
724 def_bool y
725
726source "drivers/Kconfig"
727
728source "fs/Kconfig"
729
730source "arch/s390/Kconfig.debug"
731
732source "security/Kconfig"
733
734source "crypto/Kconfig"
735
736source "lib/Kconfig"
737
738menu "Virtualization"
739
740config PFAULT
741 def_bool y
742 prompt "Pseudo page fault support"
743 help
744 Select this option, if you want to use PFAULT pseudo page fault
745 handling under VM. If running native or in LPAR, this option
746 has no effect. If your VM does not support PFAULT, PAGEEX
747 pseudo page fault handling will be used.
748 Note that VM 4.2 supports PFAULT but has a bug in its
749 implementation that causes some problems.
750 Everybody who wants to run Linux under VM != VM4.2 should select
751 this option.
752
753config SHARED_KERNEL
754 bool "VM shared kernel support"
755 depends on !JUMP_LABEL
756 help
757 Select this option, if you want to share the text segment of the
758 Linux kernel between different VM guests. This reduces memory
759 usage with lots of guests but greatly increases kernel size.
760 Also if a kernel was IPL'ed from a shared segment the kexec system
761 call will not work.
762 You should only select this option if you know what you are
763 doing and want to exploit this feature.
764
765config CMM
766 def_tristate n
767 prompt "Cooperative memory management"
768 help
769 Select this option, if you want to enable the kernel interface
770 to reduce the memory size of the system. This is accomplished
771 by allocating pages of memory and put them "on hold". This only
772 makes sense for a system running under VM where the unused pages
773 will be reused by VM for other guest systems. The interface
774 allows an external monitor to balance memory of many systems.
775 Everybody who wants to run Linux under VM should select this
776 option.
777
778config CMM_IUCV
779 def_bool y
780 prompt "IUCV special message interface to cooperative memory management"
781 depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
782 help
783 Select this option to enable the special message interface to
784 the cooperative memory management.
785
786config APPLDATA_BASE
787 def_bool n
788 prompt "Linux - VM Monitor Stream, base infrastructure"
789 depends on PROC_FS
790 help
791 This provides a kernel interface for creating and updating z/VM APPLDATA
792 monitor records. The monitor records are updated at certain time
793 intervals, once the timer is started.
794 Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
795 i.e. enables or disables monitoring on the Linux side.
796 A custom interval value (in seconds) can be written to
797 /proc/appldata/interval.
798
799 Defaults are 60 seconds interval and timer off.
800 The /proc entries can also be read from, showing the current settings.
801
802config APPLDATA_MEM
803 def_tristate m
804 prompt "Monitor memory management statistics"
805 depends on APPLDATA_BASE && VM_EVENT_COUNTERS
806 help
807 This provides memory management related data to the Linux - VM Monitor
808 Stream, like paging/swapping rate, memory utilisation, etc.
809 Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
810 APPLDATA monitor record, i.e. enables or disables monitoring this record
811 on the z/VM side.
812
813 Default is disabled.
814 The /proc entry can also be read from, showing the current settings.
815
816 This can also be compiled as a module, which will be called
817 appldata_mem.o.
818
819config APPLDATA_OS
820 def_tristate m
821 prompt "Monitor OS statistics"
822 depends on APPLDATA_BASE
823 help
824 This provides OS related data to the Linux - VM Monitor Stream, like
825 CPU utilisation, etc.
826 Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
827 APPLDATA monitor record, i.e. enables or disables monitoring this record
828 on the z/VM side.
829
830 Default is disabled.
831 This can also be compiled as a module, which will be called
832 appldata_os.o.
833
834config APPLDATA_NET_SUM
835 def_tristate m
836 prompt "Monitor overall network statistics"
837 depends on APPLDATA_BASE && NET
838 help
839 This provides network related data to the Linux - VM Monitor Stream,
840 currently there is only a total sum of network I/O statistics, no
841 per-interface data.
842 Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
843 APPLDATA monitor record, i.e. enables or disables monitoring this record
844 on the z/VM side.
845
846 Default is disabled.
847 This can also be compiled as a module, which will be called
848 appldata_net_sum.o.
849
850config S390_HYPFS_FS
851 def_bool y
852 prompt "s390 hypervisor file system support"
853 select SYS_HYPERVISOR
854 help
855 This is a virtual file system intended to provide accounting
856 information in an s390 hypervisor environment.
857
858source "arch/s390/kvm/Kconfig"
859
860config S390_GUEST
861 def_bool y
862 prompt "s390 support for virtio devices"
863 select TTY
864 select VIRTUALIZATION
865 select VIRTIO
866 select VIRTIO_CONSOLE
867 help
868 Enabling this option adds support for virtio based paravirtual device
869 drivers on s390.
870
871 Select this option if you want to run the kernel as a guest under
872 the KVM hypervisor.
873
874endmenu