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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_CSUM
30 bool
31 default y if KASAN
32
33config GENERIC_LOCKBREAK
34 def_bool y if PREEMPTION
35
36config PGSTE
37 def_bool y if KVM
38
39config AUDIT_ARCH
40 def_bool y
41
42config NO_IOPORT_MAP
43 def_bool y
44
45config PCI_QUIRKS
46 def_bool n
47
48config ARCH_SUPPORTS_UPROBES
49 def_bool y
50
51config KASAN_SHADOW_OFFSET
52 hex
53 depends on KASAN
54 default 0x1C000000000000
55
56config S390
57 def_bool y
58 #
59 # Note: keep this list sorted alphabetically
60 #
61 imply IMA_SECURE_AND_OR_TRUSTED_BOOT
62 select ALTERNATE_USER_ADDRESS_SPACE
63 select ARCH_32BIT_USTAT_F_TINODE
64 select ARCH_BINFMT_ELF_STATE
65 select ARCH_CORRECT_STACKTRACE_ON_KRETPROBE
66 select ARCH_ENABLE_MEMORY_HOTPLUG if SPARSEMEM
67 select ARCH_ENABLE_MEMORY_HOTREMOVE
68 select ARCH_ENABLE_SPLIT_PMD_PTLOCK if PGTABLE_LEVELS > 2
69 select ARCH_HAS_CURRENT_STACK_POINTER
70 select ARCH_HAS_DEBUG_VM_PGTABLE
71 select ARCH_HAS_DEBUG_WX
72 select ARCH_HAS_DEVMEM_IS_ALLOWED
73 select ARCH_HAS_ELF_RANDOMIZE
74 select ARCH_HAS_FORCE_DMA_UNENCRYPTED
75 select ARCH_HAS_FORTIFY_SOURCE
76 select ARCH_HAS_GCOV_PROFILE_ALL
77 select ARCH_HAS_GIGANTIC_PAGE
78 select ARCH_HAS_KCOV
79 select ARCH_HAS_MEM_ENCRYPT
80 select ARCH_HAS_NMI_SAFE_THIS_CPU_OPS
81 select ARCH_HAS_PTE_SPECIAL
82 select ARCH_HAS_SCALED_CPUTIME
83 select ARCH_HAS_SET_MEMORY
84 select ARCH_HAS_STRICT_KERNEL_RWX
85 select ARCH_HAS_STRICT_MODULE_RWX
86 select ARCH_HAS_SYSCALL_WRAPPER
87 select ARCH_HAS_UBSAN_SANITIZE_ALL
88 select ARCH_HAS_VDSO_DATA
89 select ARCH_HAVE_NMI_SAFE_CMPXCHG
90 select ARCH_INLINE_READ_LOCK
91 select ARCH_INLINE_READ_LOCK_BH
92 select ARCH_INLINE_READ_LOCK_IRQ
93 select ARCH_INLINE_READ_LOCK_IRQSAVE
94 select ARCH_INLINE_READ_TRYLOCK
95 select ARCH_INLINE_READ_UNLOCK
96 select ARCH_INLINE_READ_UNLOCK_BH
97 select ARCH_INLINE_READ_UNLOCK_IRQ
98 select ARCH_INLINE_READ_UNLOCK_IRQRESTORE
99 select ARCH_INLINE_SPIN_LOCK
100 select ARCH_INLINE_SPIN_LOCK_BH
101 select ARCH_INLINE_SPIN_LOCK_IRQ
102 select ARCH_INLINE_SPIN_LOCK_IRQSAVE
103 select ARCH_INLINE_SPIN_TRYLOCK
104 select ARCH_INLINE_SPIN_TRYLOCK_BH
105 select ARCH_INLINE_SPIN_UNLOCK
106 select ARCH_INLINE_SPIN_UNLOCK_BH
107 select ARCH_INLINE_SPIN_UNLOCK_IRQ
108 select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE
109 select ARCH_INLINE_WRITE_LOCK
110 select ARCH_INLINE_WRITE_LOCK_BH
111 select ARCH_INLINE_WRITE_LOCK_IRQ
112 select ARCH_INLINE_WRITE_LOCK_IRQSAVE
113 select ARCH_INLINE_WRITE_TRYLOCK
114 select ARCH_INLINE_WRITE_UNLOCK
115 select ARCH_INLINE_WRITE_UNLOCK_BH
116 select ARCH_INLINE_WRITE_UNLOCK_IRQ
117 select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE
118 select ARCH_STACKWALK
119 select ARCH_SUPPORTS_ATOMIC_RMW
120 select ARCH_SUPPORTS_DEBUG_PAGEALLOC
121 select ARCH_SUPPORTS_HUGETLBFS
122 select ARCH_SUPPORTS_NUMA_BALANCING
123 select ARCH_USE_BUILTIN_BSWAP
124 select ARCH_USE_CMPXCHG_LOCKREF
125 select ARCH_WANTS_DYNAMIC_TASK_STRUCT
126 select ARCH_WANTS_NO_INSTR
127 select ARCH_WANT_DEFAULT_BPF_JIT
128 select ARCH_WANT_IPC_PARSE_VERSION
129 select ARCH_WANT_HUGETLB_PAGE_OPTIMIZE_VMEMMAP
130 select BUILDTIME_TABLE_SORT
131 select CLONE_BACKWARDS2
132 select DMA_OPS if PCI
133 select DYNAMIC_FTRACE if FUNCTION_TRACER
134 select GCC12_NO_ARRAY_BOUNDS
135 select GENERIC_ALLOCATOR
136 select GENERIC_CPU_AUTOPROBE
137 select GENERIC_CPU_VULNERABILITIES
138 select GENERIC_ENTRY
139 select GENERIC_GETTIMEOFDAY
140 select GENERIC_PTDUMP
141 select GENERIC_SMP_IDLE_THREAD
142 select GENERIC_TIME_VSYSCALL
143 select GENERIC_VDSO_TIME_NS
144 select HAVE_ALIGNED_STRUCT_PAGE if SLUB
145 select HAVE_ARCH_AUDITSYSCALL
146 select HAVE_ARCH_JUMP_LABEL
147 select HAVE_ARCH_JUMP_LABEL_RELATIVE
148 select HAVE_ARCH_KASAN
149 select HAVE_ARCH_KASAN_VMALLOC
150 select HAVE_ARCH_KCSAN
151 select HAVE_ARCH_KFENCE
152 select HAVE_ARCH_RANDOMIZE_KSTACK_OFFSET
153 select HAVE_ARCH_SECCOMP_FILTER
154 select HAVE_ARCH_SOFT_DIRTY
155 select HAVE_ARCH_TRACEHOOK
156 select HAVE_ARCH_TRANSPARENT_HUGEPAGE
157 select HAVE_ARCH_VMAP_STACK
158 select HAVE_ASM_MODVERSIONS
159 select HAVE_CMPXCHG_DOUBLE
160 select HAVE_CMPXCHG_LOCAL
161 select HAVE_DEBUG_KMEMLEAK
162 select HAVE_DMA_CONTIGUOUS
163 select HAVE_DYNAMIC_FTRACE
164 select HAVE_DYNAMIC_FTRACE_WITH_ARGS
165 select HAVE_DYNAMIC_FTRACE_WITH_DIRECT_CALLS
166 select HAVE_DYNAMIC_FTRACE_WITH_REGS
167 select HAVE_EBPF_JIT if HAVE_MARCH_Z196_FEATURES
168 select HAVE_EFFICIENT_UNALIGNED_ACCESS
169 select HAVE_FAST_GUP
170 select HAVE_FENTRY
171 select HAVE_FTRACE_MCOUNT_RECORD
172 select HAVE_FUNCTION_ARG_ACCESS_API
173 select HAVE_FUNCTION_ERROR_INJECTION
174 select HAVE_FUNCTION_GRAPH_TRACER
175 select HAVE_FUNCTION_TRACER
176 select HAVE_GCC_PLUGINS
177 select HAVE_GENERIC_VDSO
178 select HAVE_IOREMAP_PROT if PCI
179 select HAVE_KERNEL_BZIP2
180 select HAVE_KERNEL_GZIP
181 select HAVE_KERNEL_LZ4
182 select HAVE_KERNEL_LZMA
183 select HAVE_KERNEL_LZO
184 select HAVE_KERNEL_UNCOMPRESSED
185 select HAVE_KERNEL_XZ
186 select HAVE_KERNEL_ZSTD
187 select HAVE_KPROBES
188 select HAVE_KPROBES_ON_FTRACE
189 select HAVE_KRETPROBES
190 select HAVE_KVM
191 select HAVE_LIVEPATCH
192 select HAVE_MEMBLOCK_PHYS_MAP
193 select HAVE_MOD_ARCH_SPECIFIC
194 select HAVE_NMI
195 select HAVE_NOP_MCOUNT
196 select HAVE_PCI
197 select HAVE_PERF_EVENTS
198 select HAVE_PERF_REGS
199 select HAVE_PERF_USER_STACK_DUMP
200 select HAVE_REGS_AND_STACK_ACCESS_API
201 select HAVE_RELIABLE_STACKTRACE
202 select HAVE_RSEQ
203 select HAVE_SAMPLE_FTRACE_DIRECT
204 select HAVE_SAMPLE_FTRACE_DIRECT_MULTI
205 select HAVE_SETUP_PER_CPU_AREA
206 select HAVE_SOFTIRQ_ON_OWN_STACK
207 select HAVE_SYSCALL_TRACEPOINTS
208 select HAVE_VIRT_CPU_ACCOUNTING
209 select HAVE_VIRT_CPU_ACCOUNTING_IDLE
210 select IOMMU_HELPER if PCI
211 select IOMMU_SUPPORT if PCI
212 select MMU_GATHER_NO_GATHER
213 select MMU_GATHER_RCU_TABLE_FREE
214 select MMU_GATHER_MERGE_VMAS
215 select MODULES_USE_ELF_RELA
216 select NEED_DMA_MAP_STATE if PCI
217 select NEED_PER_CPU_EMBED_FIRST_CHUNK
218 select NEED_SG_DMA_LENGTH if PCI
219 select OLD_SIGACTION
220 select OLD_SIGSUSPEND3
221 select PCI_DOMAINS if PCI
222 select PCI_MSI if PCI
223 select PCI_MSI_ARCH_FALLBACKS if PCI_MSI
224 select SPARSE_IRQ
225 select SWIOTLB
226 select SYSCTL_EXCEPTION_TRACE
227 select THREAD_INFO_IN_TASK
228 select TRACE_IRQFLAGS_SUPPORT
229 select TTY
230 select VIRT_CPU_ACCOUNTING
231 select ZONE_DMA
232 # Note: keep the above list sorted alphabetically
233
234config SCHED_OMIT_FRAME_POINTER
235 def_bool y
236
237config PGTABLE_LEVELS
238 int
239 default 5
240
241source "kernel/livepatch/Kconfig"
242
243menu "Processor type and features"
244
245config HAVE_MARCH_Z10_FEATURES
246 def_bool n
247
248config HAVE_MARCH_Z196_FEATURES
249 def_bool n
250 select HAVE_MARCH_Z10_FEATURES
251
252config HAVE_MARCH_ZEC12_FEATURES
253 def_bool n
254 select HAVE_MARCH_Z196_FEATURES
255
256config HAVE_MARCH_Z13_FEATURES
257 def_bool n
258 select HAVE_MARCH_ZEC12_FEATURES
259
260config HAVE_MARCH_Z14_FEATURES
261 def_bool n
262 select HAVE_MARCH_Z13_FEATURES
263
264config HAVE_MARCH_Z15_FEATURES
265 def_bool n
266 select HAVE_MARCH_Z14_FEATURES
267
268config HAVE_MARCH_Z16_FEATURES
269 def_bool n
270 select HAVE_MARCH_Z15_FEATURES
271
272choice
273 prompt "Processor type"
274 default MARCH_Z196
275
276config MARCH_Z10
277 bool "IBM System z10"
278 select HAVE_MARCH_Z10_FEATURES
279 depends on $(cc-option,-march=z10)
280 help
281 Select this to enable optimizations for IBM System z10 (2097 and 2098
282 series). This is the oldest machine generation currently supported.
283
284config MARCH_Z196
285 bool "IBM zEnterprise 114 and 196"
286 select HAVE_MARCH_Z196_FEATURES
287 depends on $(cc-option,-march=z196)
288 help
289 Select this to enable optimizations for IBM zEnterprise 114 and 196
290 (2818 and 2817 series). The kernel will be slightly faster but will
291 not work on older machines.
292
293config MARCH_ZEC12
294 bool "IBM zBC12 and zEC12"
295 select HAVE_MARCH_ZEC12_FEATURES
296 depends on $(cc-option,-march=zEC12)
297 help
298 Select this to enable optimizations for IBM zBC12 and zEC12 (2828 and
299 2827 series). The kernel will be slightly faster but will not work on
300 older machines.
301
302config MARCH_Z13
303 bool "IBM z13s and z13"
304 select HAVE_MARCH_Z13_FEATURES
305 depends on $(cc-option,-march=z13)
306 help
307 Select this to enable optimizations for IBM z13s and z13 (2965 and
308 2964 series). The kernel will be slightly faster but will not work on
309 older machines.
310
311config MARCH_Z14
312 bool "IBM z14 ZR1 and z14"
313 select HAVE_MARCH_Z14_FEATURES
314 depends on $(cc-option,-march=z14)
315 help
316 Select this to enable optimizations for IBM z14 ZR1 and z14 (3907
317 and 3906 series). The kernel will be slightly faster but will not
318 work on older machines.
319
320config MARCH_Z15
321 bool "IBM z15"
322 select HAVE_MARCH_Z15_FEATURES
323 depends on $(cc-option,-march=z15)
324 help
325 Select this to enable optimizations for IBM z15 (8562
326 and 8561 series). The kernel will be slightly faster but will not
327 work on older machines.
328
329config MARCH_Z16
330 bool "IBM z16"
331 select HAVE_MARCH_Z16_FEATURES
332 depends on $(cc-option,-march=z16)
333 help
334 Select this to enable optimizations for IBM z16 (3931 and
335 3932 series).
336
337endchoice
338
339config MARCH_Z10_TUNE
340 def_bool TUNE_Z10 || MARCH_Z10 && TUNE_DEFAULT
341
342config MARCH_Z196_TUNE
343 def_bool TUNE_Z196 || MARCH_Z196 && TUNE_DEFAULT
344
345config MARCH_ZEC12_TUNE
346 def_bool TUNE_ZEC12 || MARCH_ZEC12 && TUNE_DEFAULT
347
348config MARCH_Z13_TUNE
349 def_bool TUNE_Z13 || MARCH_Z13 && TUNE_DEFAULT
350
351config MARCH_Z14_TUNE
352 def_bool TUNE_Z14 || MARCH_Z14 && TUNE_DEFAULT
353
354config MARCH_Z15_TUNE
355 def_bool TUNE_Z15 || MARCH_Z15 && TUNE_DEFAULT
356
357config MARCH_Z16_TUNE
358 def_bool TUNE_Z16 || MARCH_Z16 && TUNE_DEFAULT
359
360choice
361 prompt "Tune code generation"
362 default TUNE_DEFAULT
363 help
364 Cause the compiler to tune (-mtune) the generated code for a machine.
365 This will make the code run faster on the selected machine but
366 somewhat slower on other machines.
367 This option only changes how the compiler emits instructions, not the
368 selection of instructions itself, so the resulting kernel will run on
369 all other machines.
370
371config TUNE_DEFAULT
372 bool "Default"
373 help
374 Tune the generated code for the target processor for which the kernel
375 will be compiled.
376
377config TUNE_Z10
378 bool "IBM System z10"
379
380config TUNE_Z196
381 bool "IBM zEnterprise 114 and 196"
382 depends on $(cc-option,-mtune=z196)
383
384config TUNE_ZEC12
385 bool "IBM zBC12 and zEC12"
386 depends on $(cc-option,-mtune=zEC12)
387
388config TUNE_Z13
389 bool "IBM z13s and z13"
390 depends on $(cc-option,-mtune=z13)
391
392config TUNE_Z14
393 bool "IBM z14 ZR1 and z14"
394 depends on $(cc-option,-mtune=z14)
395
396config TUNE_Z15
397 bool "IBM z15"
398 depends on $(cc-option,-mtune=z15)
399
400config TUNE_Z16
401 bool "IBM z16"
402 depends on $(cc-option,-mtune=z16)
403
404endchoice
405
406config 64BIT
407 def_bool y
408
409config COMMAND_LINE_SIZE
410 int "Maximum size of kernel command line"
411 default 4096
412 range 896 1048576
413 help
414 This allows you to specify the maximum length of the kernel command
415 line.
416
417config COMPAT
418 def_bool y
419 prompt "Kernel support for 31 bit emulation"
420 select ARCH_WANT_OLD_COMPAT_IPC
421 select COMPAT_OLD_SIGACTION
422 select HAVE_UID16
423 depends on MULTIUSER
424 depends on !CC_IS_CLANG
425 help
426 Select this option if you want to enable your system kernel to
427 handle system-calls from ELF binaries for 31 bit ESA. This option
428 (and some other stuff like libraries and such) is needed for
429 executing 31 bit applications. It is safe to say "Y".
430
431config SMP
432 def_bool y
433
434config NR_CPUS
435 int "Maximum number of CPUs (2-512)"
436 range 2 512
437 default "64"
438 help
439 This allows you to specify the maximum number of CPUs which this
440 kernel will support. The maximum supported value is 512 and the
441 minimum value which makes sense is 2.
442
443 This is purely to save memory - each supported CPU adds
444 approximately sixteen kilobytes to the kernel image.
445
446config HOTPLUG_CPU
447 def_bool y
448
449config NUMA
450 bool "NUMA support"
451 depends on SCHED_TOPOLOGY
452 default n
453 help
454 Enable NUMA support
455
456 This option adds NUMA support to the kernel.
457
458config NODES_SHIFT
459 int
460 depends on NUMA
461 default "1"
462
463config SCHED_SMT
464 def_bool n
465
466config SCHED_MC
467 def_bool n
468
469config SCHED_BOOK
470 def_bool n
471
472config SCHED_DRAWER
473 def_bool n
474
475config SCHED_TOPOLOGY
476 def_bool y
477 prompt "Topology scheduler support"
478 select SCHED_SMT
479 select SCHED_MC
480 select SCHED_BOOK
481 select SCHED_DRAWER
482 help
483 Topology scheduler support improves the CPU scheduler's decision
484 making when dealing with machines that have multi-threading,
485 multiple cores or multiple books.
486
487source "kernel/Kconfig.hz"
488
489config KEXEC
490 def_bool y
491 select KEXEC_CORE
492
493config KEXEC_FILE
494 bool "kexec file based system call"
495 select KEXEC_CORE
496 depends on CRYPTO
497 depends on CRYPTO_SHA256
498 depends on CRYPTO_SHA256_S390
499 help
500 Enable the kexec file based system call. In contrast to the normal
501 kexec system call this system call takes file descriptors for the
502 kernel and initramfs as arguments.
503
504config ARCH_HAS_KEXEC_PURGATORY
505 def_bool y
506 depends on KEXEC_FILE
507
508config KEXEC_SIG
509 bool "Verify kernel signature during kexec_file_load() syscall"
510 depends on KEXEC_FILE && MODULE_SIG_FORMAT
511 help
512 This option makes kernel signature verification mandatory for
513 the kexec_file_load() syscall.
514
515 In addition to that option, you need to enable signature
516 verification for the corresponding kernel image type being
517 loaded in order for this to work.
518
519config KERNEL_NOBP
520 def_bool n
521 prompt "Enable modified branch prediction for the kernel by default"
522 help
523 If this option is selected the kernel will switch to a modified
524 branch prediction mode if the firmware interface is available.
525 The modified branch prediction mode improves the behaviour in
526 regard to speculative execution.
527
528 With the option enabled the kernel parameter "nobp=0" or "nospec"
529 can be used to run the kernel in the normal branch prediction mode.
530
531 With the option disabled the modified branch prediction mode is
532 enabled with the "nobp=1" kernel parameter.
533
534 If unsure, say N.
535
536config EXPOLINE
537 def_bool n
538 depends on $(cc-option,-mindirect-branch=thunk)
539 prompt "Avoid speculative indirect branches in the kernel"
540 help
541 Compile the kernel with the expoline compiler options to guard
542 against kernel-to-user data leaks by avoiding speculative indirect
543 branches.
544 Requires a compiler with -mindirect-branch=thunk support for full
545 protection. The kernel may run slower.
546
547 If unsure, say N.
548
549config EXPOLINE_EXTERN
550 def_bool n
551 depends on EXPOLINE
552 depends on CC_IS_GCC && GCC_VERSION >= 110200
553 depends on $(success,$(srctree)/arch/s390/tools/gcc-thunk-extern.sh $(CC))
554 prompt "Generate expolines as extern functions."
555 help
556 This option is required for some tooling like kpatch. The kernel is
557 compiled with -mindirect-branch=thunk-extern and requires a newer
558 compiler.
559
560 If unsure, say N.
561
562choice
563 prompt "Expoline default"
564 depends on EXPOLINE
565 default EXPOLINE_FULL
566
567config EXPOLINE_OFF
568 bool "spectre_v2=off"
569
570config EXPOLINE_AUTO
571 bool "spectre_v2=auto"
572
573config EXPOLINE_FULL
574 bool "spectre_v2=on"
575
576endchoice
577
578config RELOCATABLE
579 def_bool y
580 help
581 This builds a kernel image that retains relocation information
582 so it can be loaded at an arbitrary address.
583 The kernel is linked as a position-independent executable (PIE)
584 and contains dynamic relocations which are processed early in the
585 bootup process.
586 The relocations make the kernel image about 15% larger (compressed
587 10%), but are discarded at runtime.
588 Note: this option exists only for documentation purposes, please do
589 not remove it.
590
591config RANDOMIZE_BASE
592 bool "Randomize the address of the kernel image (KASLR)"
593 default y
594 help
595 In support of Kernel Address Space Layout Randomization (KASLR),
596 this randomizes the address at which the kernel image is loaded,
597 as a security feature that deters exploit attempts relying on
598 knowledge of the location of kernel internals.
599
600endmenu
601
602menu "Memory setup"
603
604config ARCH_SPARSEMEM_ENABLE
605 def_bool y
606 select SPARSEMEM_VMEMMAP_ENABLE
607 select SPARSEMEM_VMEMMAP
608
609config ARCH_SPARSEMEM_DEFAULT
610 def_bool y
611
612config MAX_PHYSMEM_BITS
613 int "Maximum size of supported physical memory in bits (42-53)"
614 range 42 53
615 default "46"
616 help
617 This option specifies the maximum supported size of physical memory
618 in bits. Supported is any size between 2^42 (4TB) and 2^53 (8PB).
619 Increasing the number of bits also increases the kernel image size.
620 By default 46 bits (64TB) are supported.
621
622config CHECK_STACK
623 def_bool y
624 depends on !VMAP_STACK
625 prompt "Detect kernel stack overflow"
626 help
627 This option enables the compiler option -mstack-guard and
628 -mstack-size if they are available. If the compiler supports them
629 it will emit additional code to each function prolog to trigger
630 an illegal operation if the kernel stack is about to overflow.
631
632 Say N if you are unsure.
633
634config STACK_GUARD
635 int "Size of the guard area (128-1024)"
636 range 128 1024
637 depends on CHECK_STACK
638 default "256"
639 help
640 This allows you to specify the size of the guard area at the lower
641 end of the kernel stack. If the kernel stack points into the guard
642 area on function entry an illegal operation is triggered. The size
643 needs to be a power of 2. Please keep in mind that the size of an
644 interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
645 The minimum size for the stack guard should be 256 for 31 bit and
646 512 for 64 bit.
647
648endmenu
649
650menu "I/O subsystem"
651
652config QDIO
653 def_tristate y
654 prompt "QDIO support"
655 help
656 This driver provides the Queued Direct I/O base support for
657 IBM System z.
658
659 To compile this driver as a module, choose M here: the
660 module will be called qdio.
661
662 If unsure, say Y.
663
664if PCI
665
666config PCI_NR_FUNCTIONS
667 int "Maximum number of PCI functions (1-4096)"
668 range 1 4096
669 default "512"
670 help
671 This allows you to specify the maximum number of PCI functions which
672 this kernel will support.
673
674endif # PCI
675
676config HAS_IOMEM
677 def_bool PCI
678
679config CHSC_SCH
680 def_tristate m
681 prompt "Support for CHSC subchannels"
682 help
683 This driver allows usage of CHSC subchannels. A CHSC subchannel
684 is usually present on LPAR only.
685 The driver creates a device /dev/chsc, which may be used to
686 obtain I/O configuration information about the machine and
687 to issue asynchronous chsc commands (DANGEROUS).
688 You will usually only want to use this interface on a special
689 LPAR designated for system management.
690
691 To compile this driver as a module, choose M here: the
692 module will be called chsc_sch.
693
694 If unsure, say N.
695
696config SCM_BUS
697 def_bool y
698 prompt "SCM bus driver"
699 help
700 Bus driver for Storage Class Memory.
701
702config EADM_SCH
703 def_tristate m
704 prompt "Support for EADM subchannels"
705 depends on SCM_BUS
706 help
707 This driver allows usage of EADM subchannels. EADM subchannels act
708 as a communication vehicle for SCM increments.
709
710 To compile this driver as a module, choose M here: the
711 module will be called eadm_sch.
712
713config VFIO_CCW
714 def_tristate n
715 prompt "Support for VFIO-CCW subchannels"
716 depends on S390_CCW_IOMMU && VFIO_MDEV
717 help
718 This driver allows usage of I/O subchannels via VFIO-CCW.
719
720 To compile this driver as a module, choose M here: the
721 module will be called vfio_ccw.
722
723config VFIO_AP
724 def_tristate n
725 prompt "VFIO support for AP devices"
726 depends on S390_AP_IOMMU && VFIO_MDEV && KVM
727 depends on ZCRYPT
728 help
729 This driver grants access to Adjunct Processor (AP) devices
730 via the VFIO mediated device interface.
731
732 To compile this driver as a module, choose M here: the module
733 will be called vfio_ap.
734
735endmenu
736
737menu "Dump support"
738
739config CRASH_DUMP
740 bool "kernel crash dumps"
741 select KEXEC
742 help
743 Generate crash dump after being started by kexec.
744 Crash dump kernels are loaded in the main kernel with kexec-tools
745 into a specially reserved region and then later executed after
746 a crash by kdump/kexec.
747 Refer to <file:Documentation/s390/zfcpdump.rst> for more details on this.
748 This option also enables s390 zfcpdump.
749 See also <file:Documentation/s390/zfcpdump.rst>
750
751endmenu
752
753config CCW
754 def_bool y
755
756config HAVE_PNETID
757 tristate
758 default (SMC || CCWGROUP)
759
760menu "Virtualization"
761
762config PROTECTED_VIRTUALIZATION_GUEST
763 def_bool n
764 prompt "Protected virtualization guest support"
765 help
766 Select this option, if you want to be able to run this
767 kernel as a protected virtualization KVM guest.
768 Protected virtualization capable machines have a mini hypervisor
769 located at machine level (an ultravisor). With help of the
770 Ultravisor, KVM will be able to run "protected" VMs, special
771 VMs whose memory and management data are unavailable to KVM.
772
773config PFAULT
774 def_bool y
775 prompt "Pseudo page fault support"
776 help
777 Select this option, if you want to use PFAULT pseudo page fault
778 handling under VM. If running native or in LPAR, this option
779 has no effect. If your VM does not support PFAULT, PAGEEX
780 pseudo page fault handling will be used.
781 Note that VM 4.2 supports PFAULT but has a bug in its
782 implementation that causes some problems.
783 Everybody who wants to run Linux under VM != VM4.2 should select
784 this option.
785
786config CMM
787 def_tristate n
788 prompt "Cooperative memory management"
789 help
790 Select this option, if you want to enable the kernel interface
791 to reduce the memory size of the system. This is accomplished
792 by allocating pages of memory and put them "on hold". This only
793 makes sense for a system running under VM where the unused pages
794 will be reused by VM for other guest systems. The interface
795 allows an external monitor to balance memory of many systems.
796 Everybody who wants to run Linux under VM should select this
797 option.
798
799config CMM_IUCV
800 def_bool y
801 prompt "IUCV special message interface to cooperative memory management"
802 depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
803 help
804 Select this option to enable the special message interface to
805 the cooperative memory management.
806
807config APPLDATA_BASE
808 def_bool n
809 prompt "Linux - VM Monitor Stream, base infrastructure"
810 depends on PROC_SYSCTL
811 help
812 This provides a kernel interface for creating and updating z/VM APPLDATA
813 monitor records. The monitor records are updated at certain time
814 intervals, once the timer is started.
815 Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
816 i.e. enables or disables monitoring on the Linux side.
817 A custom interval value (in seconds) can be written to
818 /proc/appldata/interval.
819
820 Defaults are 60 seconds interval and timer off.
821 The /proc entries can also be read from, showing the current settings.
822
823config APPLDATA_MEM
824 def_tristate m
825 prompt "Monitor memory management statistics"
826 depends on APPLDATA_BASE && VM_EVENT_COUNTERS
827 help
828 This provides memory management related data to the Linux - VM Monitor
829 Stream, like paging/swapping rate, memory utilisation, etc.
830 Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
831 APPLDATA monitor record, i.e. enables or disables monitoring this record
832 on the z/VM side.
833
834 Default is disabled.
835 The /proc entry can also be read from, showing the current settings.
836
837 This can also be compiled as a module, which will be called
838 appldata_mem.o.
839
840config APPLDATA_OS
841 def_tristate m
842 prompt "Monitor OS statistics"
843 depends on APPLDATA_BASE
844 help
845 This provides OS related data to the Linux - VM Monitor Stream, like
846 CPU utilisation, etc.
847 Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
848 APPLDATA monitor record, i.e. enables or disables monitoring this record
849 on the z/VM side.
850
851 Default is disabled.
852 This can also be compiled as a module, which will be called
853 appldata_os.o.
854
855config APPLDATA_NET_SUM
856 def_tristate m
857 prompt "Monitor overall network statistics"
858 depends on APPLDATA_BASE && NET
859 help
860 This provides network related data to the Linux - VM Monitor Stream,
861 currently there is only a total sum of network I/O statistics, no
862 per-interface data.
863 Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
864 APPLDATA monitor record, i.e. enables or disables monitoring this record
865 on the z/VM side.
866
867 Default is disabled.
868 This can also be compiled as a module, which will be called
869 appldata_net_sum.o.
870
871config S390_HYPFS_FS
872 def_bool y
873 prompt "s390 hypervisor file system support"
874 select SYS_HYPERVISOR
875 help
876 This is a virtual file system intended to provide accounting
877 information in an s390 hypervisor environment.
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
1# SPDX-License-Identifier: GPL-2.0
2config MMU
3 def_bool y
4
5config ZONE_DMA
6 def_bool y
7
8config CPU_BIG_ENDIAN
9 def_bool y
10
11config LOCKDEP_SUPPORT
12 def_bool y
13
14config STACKTRACE_SUPPORT
15 def_bool y
16
17config ARCH_HAS_ILOG2_U32
18 def_bool n
19
20config ARCH_HAS_ILOG2_U64
21 def_bool n
22
23config GENERIC_HWEIGHT
24 def_bool y
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 PREEMPT
34
35config PGSTE
36 def_bool y if KVM
37
38config ARCH_SUPPORTS_DEBUG_PAGEALLOC
39 def_bool y
40
41config AUDIT_ARCH
42 def_bool y
43
44config NO_IOPORT_MAP
45 def_bool y
46
47config PCI_QUIRKS
48 def_bool n
49
50config ARCH_SUPPORTS_UPROBES
51 def_bool y
52
53config KASAN_SHADOW_OFFSET
54 hex
55 depends on KASAN
56 default 0x18000000000000 if KASAN_S390_4_LEVEL_PAGING
57 default 0x30000000000
58
59config S390
60 def_bool y
61 select ARCH_BINFMT_ELF_STATE
62 select ARCH_HAS_DEVMEM_IS_ALLOWED
63 select ARCH_HAS_ELF_RANDOMIZE
64 select ARCH_HAS_FORTIFY_SOURCE
65 select ARCH_HAS_GCOV_PROFILE_ALL
66 select ARCH_HAS_GIGANTIC_PAGE
67 select ARCH_HAS_KCOV
68 select ARCH_HAS_MEM_ENCRYPT
69 select ARCH_HAS_PTE_SPECIAL
70 select ARCH_HAS_SET_MEMORY
71 select ARCH_HAS_STRICT_KERNEL_RWX
72 select ARCH_HAS_STRICT_MODULE_RWX
73 select ARCH_HAS_SYSCALL_WRAPPER
74 select ARCH_HAS_UBSAN_SANITIZE_ALL
75 select ARCH_HAVE_NMI_SAFE_CMPXCHG
76 select ARCH_INLINE_READ_LOCK
77 select ARCH_INLINE_READ_LOCK_BH
78 select ARCH_INLINE_READ_LOCK_IRQ
79 select ARCH_INLINE_READ_LOCK_IRQSAVE
80 select ARCH_INLINE_READ_TRYLOCK
81 select ARCH_INLINE_READ_UNLOCK
82 select ARCH_INLINE_READ_UNLOCK_BH
83 select ARCH_INLINE_READ_UNLOCK_IRQ
84 select ARCH_INLINE_READ_UNLOCK_IRQRESTORE
85 select ARCH_INLINE_SPIN_LOCK
86 select ARCH_INLINE_SPIN_LOCK_BH
87 select ARCH_INLINE_SPIN_LOCK_IRQ
88 select ARCH_INLINE_SPIN_LOCK_IRQSAVE
89 select ARCH_INLINE_SPIN_TRYLOCK
90 select ARCH_INLINE_SPIN_TRYLOCK_BH
91 select ARCH_INLINE_SPIN_UNLOCK
92 select ARCH_INLINE_SPIN_UNLOCK_BH
93 select ARCH_INLINE_SPIN_UNLOCK_IRQ
94 select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE
95 select ARCH_INLINE_WRITE_LOCK
96 select ARCH_INLINE_WRITE_LOCK_BH
97 select ARCH_INLINE_WRITE_LOCK_IRQ
98 select ARCH_INLINE_WRITE_LOCK_IRQSAVE
99 select ARCH_INLINE_WRITE_TRYLOCK
100 select ARCH_INLINE_WRITE_UNLOCK
101 select ARCH_INLINE_WRITE_UNLOCK_BH
102 select ARCH_INLINE_WRITE_UNLOCK_IRQ
103 select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE
104 select ARCH_KEEP_MEMBLOCK
105 select ARCH_SAVE_PAGE_KEYS if HIBERNATION
106 select ARCH_STACKWALK
107 select ARCH_SUPPORTS_ATOMIC_RMW
108 select ARCH_SUPPORTS_NUMA_BALANCING
109 select ARCH_USE_BUILTIN_BSWAP
110 select ARCH_USE_CMPXCHG_LOCKREF
111 select ARCH_WANTS_DYNAMIC_TASK_STRUCT
112 select ARCH_WANT_IPC_PARSE_VERSION
113 select BUILDTIME_EXTABLE_SORT
114 select CLONE_BACKWARDS2
115 select DYNAMIC_FTRACE if FUNCTION_TRACER
116 select GENERIC_CLOCKEVENTS
117 select GENERIC_CPU_AUTOPROBE
118 select GENERIC_CPU_VULNERABILITIES
119 select GENERIC_FIND_FIRST_BIT
120 select GENERIC_SMP_IDLE_THREAD
121 select GENERIC_TIME_VSYSCALL
122 select HAVE_ALIGNED_STRUCT_PAGE if SLUB
123 select HAVE_ARCH_AUDITSYSCALL
124 select HAVE_ARCH_JUMP_LABEL
125 select HAVE_ARCH_JUMP_LABEL_RELATIVE
126 select HAVE_ARCH_KASAN
127 select CPU_NO_EFFICIENT_FFS if !HAVE_MARCH_Z9_109_FEATURES
128 select HAVE_ARCH_SECCOMP_FILTER
129 select HAVE_ARCH_SOFT_DIRTY
130 select HAVE_ARCH_TRACEHOOK
131 select HAVE_ARCH_TRANSPARENT_HUGEPAGE
132 select HAVE_ARCH_VMAP_STACK
133 select HAVE_ASM_MODVERSIONS
134 select HAVE_EBPF_JIT if PACK_STACK && HAVE_MARCH_Z196_FEATURES
135 select HAVE_CMPXCHG_DOUBLE
136 select HAVE_CMPXCHG_LOCAL
137 select HAVE_COPY_THREAD_TLS
138 select HAVE_DEBUG_KMEMLEAK
139 select HAVE_DMA_CONTIGUOUS
140 select HAVE_DYNAMIC_FTRACE
141 select HAVE_DYNAMIC_FTRACE_WITH_REGS
142 select HAVE_FAST_GUP
143 select HAVE_EFFICIENT_UNALIGNED_ACCESS
144 select HAVE_FENTRY
145 select HAVE_FTRACE_MCOUNT_RECORD
146 select HAVE_FUNCTION_GRAPH_TRACER
147 select HAVE_FUNCTION_TRACER
148 select HAVE_FUTEX_CMPXCHG if FUTEX
149 select HAVE_GCC_PLUGINS
150 select HAVE_KERNEL_BZIP2
151 select HAVE_KERNEL_GZIP
152 select HAVE_KERNEL_LZ4
153 select HAVE_KERNEL_LZMA
154 select HAVE_KERNEL_LZO
155 select HAVE_KERNEL_UNCOMPRESSED
156 select HAVE_KERNEL_XZ
157 select HAVE_KPROBES
158 select HAVE_KRETPROBES
159 select HAVE_KVM
160 select HAVE_LIVEPATCH
161 select HAVE_PERF_REGS
162 select HAVE_PERF_USER_STACK_DUMP
163 select HAVE_MEMBLOCK_NODE_MAP
164 select HAVE_MEMBLOCK_PHYS_MAP
165 select HAVE_MMU_GATHER_NO_GATHER
166 select HAVE_MOD_ARCH_SPECIFIC
167 select HAVE_NOP_MCOUNT
168 select HAVE_OPROFILE
169 select HAVE_PCI
170 select HAVE_PERF_EVENTS
171 select HAVE_RCU_TABLE_FREE
172 select HAVE_REGS_AND_STACK_ACCESS_API
173 select HAVE_RSEQ
174 select HAVE_SYSCALL_TRACEPOINTS
175 select HAVE_VIRT_CPU_ACCOUNTING
176 select IOMMU_HELPER if PCI
177 select IOMMU_SUPPORT if PCI
178 select MODULES_USE_ELF_RELA
179 select NEED_DMA_MAP_STATE if PCI
180 select NEED_SG_DMA_LENGTH if PCI
181 select OLD_SIGACTION
182 select OLD_SIGSUSPEND3
183 select PCI_DOMAINS if PCI
184 select PCI_MSI if PCI
185 select SPARSE_IRQ
186 select SYSCTL_EXCEPTION_TRACE
187 select THREAD_INFO_IN_TASK
188 select TTY
189 select VIRT_CPU_ACCOUNTING
190 select ARCH_HAS_SCALED_CPUTIME
191 select HAVE_NMI
192 select ARCH_HAS_FORCE_DMA_UNENCRYPTED
193 select SWIOTLB
194 select GENERIC_ALLOCATOR
195
196
197config SCHED_OMIT_FRAME_POINTER
198 def_bool y
199
200config PGTABLE_LEVELS
201 int
202 default 5
203
204source "kernel/livepatch/Kconfig"
205
206menu "Processor type and features"
207
208config HAVE_MARCH_Z900_FEATURES
209 def_bool n
210
211config HAVE_MARCH_Z990_FEATURES
212 def_bool n
213 select HAVE_MARCH_Z900_FEATURES
214
215config HAVE_MARCH_Z9_109_FEATURES
216 def_bool n
217 select HAVE_MARCH_Z990_FEATURES
218
219config HAVE_MARCH_Z10_FEATURES
220 def_bool n
221 select HAVE_MARCH_Z9_109_FEATURES
222
223config HAVE_MARCH_Z196_FEATURES
224 def_bool n
225 select HAVE_MARCH_Z10_FEATURES
226
227config HAVE_MARCH_ZEC12_FEATURES
228 def_bool n
229 select HAVE_MARCH_Z196_FEATURES
230
231config HAVE_MARCH_Z13_FEATURES
232 def_bool n
233 select HAVE_MARCH_ZEC12_FEATURES
234
235config HAVE_MARCH_Z14_FEATURES
236 def_bool n
237 select HAVE_MARCH_Z13_FEATURES
238
239config HAVE_MARCH_Z15_FEATURES
240 def_bool n
241 select HAVE_MARCH_Z14_FEATURES
242
243choice
244 prompt "Processor type"
245 default MARCH_Z196
246
247config MARCH_Z900
248 bool "IBM zSeries model z800 and z900"
249 depends on !CC_IS_CLANG
250 select HAVE_MARCH_Z900_FEATURES
251 help
252 Select this to enable optimizations for model z800/z900 (2064 and
253 2066 series). This will enable some optimizations that are not
254 available on older ESA/390 (31 Bit) only CPUs.
255
256config MARCH_Z990
257 bool "IBM zSeries model z890 and z990"
258 depends on !CC_IS_CLANG
259 select HAVE_MARCH_Z990_FEATURES
260 help
261 Select this to enable optimizations for model z890/z990 (2084 and
262 2086 series). The kernel will be slightly faster but will not work
263 on older machines.
264
265config MARCH_Z9_109
266 bool "IBM System z9"
267 depends on !CC_IS_CLANG
268 select HAVE_MARCH_Z9_109_FEATURES
269 help
270 Select this to enable optimizations for IBM System z9 (2094 and
271 2096 series). The kernel will be slightly faster but will not work
272 on older machines.
273
274config MARCH_Z10
275 bool "IBM System z10"
276 select HAVE_MARCH_Z10_FEATURES
277 help
278 Select this to enable optimizations for IBM System z10 (2097 and
279 2098 series). The kernel will be slightly faster but will not work
280 on older machines.
281
282config MARCH_Z196
283 bool "IBM zEnterprise 114 and 196"
284 select HAVE_MARCH_Z196_FEATURES
285 help
286 Select this to enable optimizations for IBM zEnterprise 114 and 196
287 (2818 and 2817 series). The kernel will be slightly faster but will
288 not work on older machines.
289
290config MARCH_ZEC12
291 bool "IBM zBC12 and zEC12"
292 select HAVE_MARCH_ZEC12_FEATURES
293 help
294 Select this to enable optimizations for IBM zBC12 and zEC12 (2828 and
295 2827 series). The kernel will be slightly faster but will not work on
296 older machines.
297
298config MARCH_Z13
299 bool "IBM z13s and z13"
300 select HAVE_MARCH_Z13_FEATURES
301 help
302 Select this to enable optimizations for IBM z13s and z13 (2965 and
303 2964 series). The kernel will be slightly faster but will not work on
304 older machines.
305
306config MARCH_Z14
307 bool "IBM z14 ZR1 and z14"
308 select HAVE_MARCH_Z14_FEATURES
309 help
310 Select this to enable optimizations for IBM z14 ZR1 and z14 (3907
311 and 3906 series). The kernel will be slightly faster but will not
312 work on older machines.
313
314config MARCH_Z15
315 bool "IBM z15"
316 select HAVE_MARCH_Z15_FEATURES
317 help
318 Select this to enable optimizations for IBM z15 (8562
319 and 8561 series). The kernel will be slightly faster but will not
320 work on older machines.
321
322endchoice
323
324config MARCH_Z900_TUNE
325 def_bool TUNE_Z900 || MARCH_Z900 && TUNE_DEFAULT
326
327config MARCH_Z990_TUNE
328 def_bool TUNE_Z990 || MARCH_Z990 && TUNE_DEFAULT
329
330config MARCH_Z9_109_TUNE
331 def_bool TUNE_Z9_109 || MARCH_Z9_109 && TUNE_DEFAULT
332
333config MARCH_Z10_TUNE
334 def_bool TUNE_Z10 || MARCH_Z10 && TUNE_DEFAULT
335
336config MARCH_Z196_TUNE
337 def_bool TUNE_Z196 || MARCH_Z196 && TUNE_DEFAULT
338
339config MARCH_ZEC12_TUNE
340 def_bool TUNE_ZEC12 || MARCH_ZEC12 && TUNE_DEFAULT
341
342config MARCH_Z13_TUNE
343 def_bool TUNE_Z13 || MARCH_Z13 && TUNE_DEFAULT
344
345config MARCH_Z14_TUNE
346 def_bool TUNE_Z14 || MARCH_Z14 && TUNE_DEFAULT
347
348config MARCH_Z15_TUNE
349 def_bool TUNE_Z15 || MARCH_Z15 && TUNE_DEFAULT
350
351choice
352 prompt "Tune code generation"
353 default TUNE_DEFAULT
354 help
355 Cause the compiler to tune (-mtune) the generated code for a machine.
356 This will make the code run faster on the selected machine but
357 somewhat slower on other machines.
358 This option only changes how the compiler emits instructions, not the
359 selection of instructions itself, so the resulting kernel will run on
360 all other machines.
361
362config TUNE_DEFAULT
363 bool "Default"
364 help
365 Tune the generated code for the target processor for which the kernel
366 will be compiled.
367
368config TUNE_Z900
369 bool "IBM zSeries model z800 and z900"
370 depends on !CC_IS_CLANG
371
372config TUNE_Z990
373 bool "IBM zSeries model z890 and z990"
374 depends on !CC_IS_CLANG
375
376config TUNE_Z9_109
377 bool "IBM System z9"
378 depends on !CC_IS_CLANG
379
380config TUNE_Z10
381 bool "IBM System z10"
382
383config TUNE_Z196
384 bool "IBM zEnterprise 114 and 196"
385
386config TUNE_ZEC12
387 bool "IBM zBC12 and zEC12"
388
389config TUNE_Z13
390 bool "IBM z13"
391
392config TUNE_Z14
393 bool "IBM z14"
394
395config TUNE_Z15
396 bool "IBM z15"
397
398endchoice
399
400config 64BIT
401 def_bool y
402
403config COMPAT
404 def_bool y
405 prompt "Kernel support for 31 bit emulation"
406 select COMPAT_BINFMT_ELF if BINFMT_ELF
407 select ARCH_WANT_OLD_COMPAT_IPC
408 select COMPAT_OLD_SIGACTION
409 select HAVE_UID16
410 depends on MULTIUSER
411 help
412 Select this option if you want to enable your system kernel to
413 handle system-calls from ELF binaries for 31 bit ESA. This option
414 (and some other stuff like libraries and such) is needed for
415 executing 31 bit applications. It is safe to say "Y".
416
417config COMPAT_VDSO
418 def_bool COMPAT && !CC_IS_CLANG
419
420config SYSVIPC_COMPAT
421 def_bool y if COMPAT && SYSVIPC
422
423config SMP
424 def_bool y
425
426config NR_CPUS
427 int "Maximum number of CPUs (2-512)"
428 range 2 512
429 default "64"
430 help
431 This allows you to specify the maximum number of CPUs which this
432 kernel will support. The maximum supported value is 512 and the
433 minimum value which makes sense is 2.
434
435 This is purely to save memory - each supported CPU adds
436 approximately sixteen kilobytes to the kernel image.
437
438config HOTPLUG_CPU
439 def_bool y
440
441# Some NUMA nodes have memory ranges that span
442# other nodes. Even though a pfn is valid and
443# between a node's start and end pfns, it may not
444# reside on that node. See memmap_init_zone()
445# for details. <- They meant memory holes!
446config NODES_SPAN_OTHER_NODES
447 def_bool NUMA
448
449config NUMA
450 bool "NUMA support"
451 depends on SCHED_TOPOLOGY
452 default n
453 help
454 Enable NUMA support
455
456 This option adds NUMA support to the kernel.
457
458 An operation mode can be selected by appending
459 numa=<method> to the kernel command line.
460
461 The default behaviour is identical to appending numa=plain to
462 the command line. This will create just one node with all
463 available memory and all CPUs in it.
464
465config NODES_SHIFT
466 int "Maximum NUMA nodes (as a power of 2)"
467 range 1 10
468 depends on NUMA
469 default "4"
470 help
471 Specify the maximum number of NUMA nodes available on the target
472 system. Increases memory reserved to accommodate various tables.
473
474menu "Select NUMA modes"
475 depends on NUMA
476
477config NUMA_EMU
478 bool "NUMA emulation"
479 default y
480 help
481 Numa emulation mode will split the available system memory into
482 equal chunks which then are distributed over the configured number
483 of nodes in a round-robin manner.
484
485 The number of fake nodes is limited by the number of available memory
486 chunks (i.e. memory size / fake size) and the number of supported
487 nodes in the kernel.
488
489 The CPUs are assigned to the nodes in a way that partially respects
490 the original machine topology (if supported by the machine).
491 Fair distribution of the CPUs is not guaranteed.
492
493config EMU_SIZE
494 hex "NUMA emulation memory chunk size"
495 default 0x10000000
496 range 0x400000 0x100000000
497 depends on NUMA_EMU
498 help
499 Select the default size by which the memory is chopped and then
500 assigned to emulated NUMA nodes.
501
502 This can be overridden by specifying
503
504 emu_size=<n>
505
506 on the kernel command line where also suffixes K, M, G, and T are
507 supported.
508
509endmenu
510
511config SCHED_SMT
512 def_bool n
513
514config SCHED_MC
515 def_bool n
516
517config SCHED_BOOK
518 def_bool n
519
520config SCHED_DRAWER
521 def_bool n
522
523config SCHED_TOPOLOGY
524 def_bool y
525 prompt "Topology scheduler support"
526 select SCHED_SMT
527 select SCHED_MC
528 select SCHED_BOOK
529 select SCHED_DRAWER
530 help
531 Topology scheduler support improves the CPU scheduler's decision
532 making when dealing with machines that have multi-threading,
533 multiple cores or multiple books.
534
535source "kernel/Kconfig.hz"
536
537config KEXEC
538 def_bool y
539 select KEXEC_CORE
540
541config KEXEC_FILE
542 bool "kexec file based system call"
543 select KEXEC_CORE
544 select BUILD_BIN2C
545 depends on CRYPTO
546 depends on CRYPTO_SHA256
547 depends on CRYPTO_SHA256_S390
548 help
549 Enable the kexec file based system call. In contrast to the normal
550 kexec system call this system call takes file descriptors for the
551 kernel and initramfs as arguments.
552
553config ARCH_HAS_KEXEC_PURGATORY
554 def_bool y
555 depends on KEXEC_FILE
556
557config KEXEC_SIG
558 bool "Verify kernel signature during kexec_file_load() syscall"
559 depends on KEXEC_FILE && MODULE_SIG_FORMAT
560 help
561 This option makes kernel signature verification mandatory for
562 the kexec_file_load() syscall.
563
564 In addition to that option, you need to enable signature
565 verification for the corresponding kernel image type being
566 loaded in order for this to work.
567
568config ARCH_RANDOM
569 def_bool y
570 prompt "s390 architectural random number generation API"
571 help
572 Enable the s390 architectural random number generation API
573 to provide random data for all consumers within the Linux
574 kernel.
575
576 When enabled the arch_random_* functions declared in linux/random.h
577 are implemented. The implementation is based on the s390 CPACF
578 instruction subfunction TRNG which provides a real true random
579 number generator.
580
581 If unsure, say Y.
582
583config KERNEL_NOBP
584 def_bool n
585 prompt "Enable modified branch prediction for the kernel by default"
586 help
587 If this option is selected the kernel will switch to a modified
588 branch prediction mode if the firmware interface is available.
589 The modified branch prediction mode improves the behaviour in
590 regard to speculative execution.
591
592 With the option enabled the kernel parameter "nobp=0" or "nospec"
593 can be used to run the kernel in the normal branch prediction mode.
594
595 With the option disabled the modified branch prediction mode is
596 enabled with the "nobp=1" kernel parameter.
597
598 If unsure, say N.
599
600config EXPOLINE
601 def_bool n
602 prompt "Avoid speculative indirect branches in the kernel"
603 help
604 Compile the kernel with the expoline compiler options to guard
605 against kernel-to-user data leaks by avoiding speculative indirect
606 branches.
607 Requires a compiler with -mindirect-branch=thunk support for full
608 protection. The kernel may run slower.
609
610 If unsure, say N.
611
612choice
613 prompt "Expoline default"
614 depends on EXPOLINE
615 default EXPOLINE_FULL
616
617config EXPOLINE_OFF
618 bool "spectre_v2=off"
619
620config EXPOLINE_AUTO
621 bool "spectre_v2=auto"
622
623config EXPOLINE_FULL
624 bool "spectre_v2=on"
625
626endchoice
627
628config RELOCATABLE
629 bool "Build a relocatable kernel"
630 select MODULE_REL_CRCS if MODVERSIONS
631 default y
632 help
633 This builds a kernel image that retains relocation information
634 so it can be loaded at an arbitrary address.
635 The kernel is linked as a position-independent executable (PIE)
636 and contains dynamic relocations which are processed early in the
637 bootup process.
638 The relocations make the kernel image about 15% larger (compressed
639 10%), but are discarded at runtime.
640
641config RANDOMIZE_BASE
642 bool "Randomize the address of the kernel image (KASLR)"
643 depends on RELOCATABLE
644 default y
645 help
646 In support of Kernel Address Space Layout Randomization (KASLR),
647 this randomizes the address at which the kernel image is loaded,
648 as a security feature that deters exploit attempts relying on
649 knowledge of the location of kernel internals.
650
651endmenu
652
653menu "Memory setup"
654
655config ARCH_SPARSEMEM_ENABLE
656 def_bool y
657 select SPARSEMEM_VMEMMAP_ENABLE
658 select SPARSEMEM_VMEMMAP
659
660config ARCH_SPARSEMEM_DEFAULT
661 def_bool y
662
663config ARCH_ENABLE_MEMORY_HOTPLUG
664 def_bool y if SPARSEMEM
665
666config ARCH_ENABLE_MEMORY_HOTREMOVE
667 def_bool y
668
669config ARCH_ENABLE_SPLIT_PMD_PTLOCK
670 def_bool y
671
672config FORCE_MAX_ZONEORDER
673 int
674 default "9"
675
676config MAX_PHYSMEM_BITS
677 int "Maximum size of supported physical memory in bits (42-53)"
678 range 42 53
679 default "46"
680 help
681 This option specifies the maximum supported size of physical memory
682 in bits. Supported is any size between 2^42 (4TB) and 2^53 (8PB).
683 Increasing the number of bits also increases the kernel image size.
684 By default 46 bits (64TB) are supported.
685
686config PACK_STACK
687 def_bool y
688 prompt "Pack kernel stack"
689 help
690 This option enables the compiler option -mkernel-backchain if it
691 is available. If the option is available the compiler supports
692 the new stack layout which dramatically reduces the minimum stack
693 frame size. With an old compiler a non-leaf function needs a
694 minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
695 -mkernel-backchain the minimum size drops to 16 byte on 31 bit
696 and 24 byte on 64 bit.
697
698 Say Y if you are unsure.
699
700config CHECK_STACK
701 def_bool y
702 depends on !VMAP_STACK
703 prompt "Detect kernel stack overflow"
704 help
705 This option enables the compiler option -mstack-guard and
706 -mstack-size if they are available. If the compiler supports them
707 it will emit additional code to each function prolog to trigger
708 an illegal operation if the kernel stack is about to overflow.
709
710 Say N if you are unsure.
711
712config STACK_GUARD
713 int "Size of the guard area (128-1024)"
714 range 128 1024
715 depends on CHECK_STACK
716 default "256"
717 help
718 This allows you to specify the size of the guard area at the lower
719 end of the kernel stack. If the kernel stack points into the guard
720 area on function entry an illegal operation is triggered. The size
721 needs to be a power of 2. Please keep in mind that the size of an
722 interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
723 The minimum size for the stack guard should be 256 for 31 bit and
724 512 for 64 bit.
725
726config WARN_DYNAMIC_STACK
727 def_bool n
728 prompt "Emit compiler warnings for function with dynamic stack usage"
729 help
730 This option enables the compiler option -mwarn-dynamicstack. If the
731 compiler supports this options generates warnings for functions
732 that dynamically allocate stack space using alloca.
733
734 Say N if you are unsure.
735
736endmenu
737
738menu "I/O subsystem"
739
740config QDIO
741 def_tristate y
742 prompt "QDIO support"
743 ---help---
744 This driver provides the Queued Direct I/O base support for
745 IBM System z.
746
747 To compile this driver as a module, choose M here: the
748 module will be called qdio.
749
750 If unsure, say Y.
751
752if PCI
753
754config PCI_NR_FUNCTIONS
755 int "Maximum number of PCI functions (1-4096)"
756 range 1 4096
757 default "128"
758 help
759 This allows you to specify the maximum number of PCI functions which
760 this kernel will support.
761
762endif # PCI
763
764config HAS_IOMEM
765 def_bool PCI
766
767config CHSC_SCH
768 def_tristate m
769 prompt "Support for CHSC subchannels"
770 help
771 This driver allows usage of CHSC subchannels. A CHSC subchannel
772 is usually present on LPAR only.
773 The driver creates a device /dev/chsc, which may be used to
774 obtain I/O configuration information about the machine and
775 to issue asynchronous chsc commands (DANGEROUS).
776 You will usually only want to use this interface on a special
777 LPAR designated for system management.
778
779 To compile this driver as a module, choose M here: the
780 module will be called chsc_sch.
781
782 If unsure, say N.
783
784config SCM_BUS
785 def_bool y
786 prompt "SCM bus driver"
787 help
788 Bus driver for Storage Class Memory.
789
790config EADM_SCH
791 def_tristate m
792 prompt "Support for EADM subchannels"
793 depends on SCM_BUS
794 help
795 This driver allows usage of EADM subchannels. EADM subchannels act
796 as a communication vehicle for SCM increments.
797
798 To compile this driver as a module, choose M here: the
799 module will be called eadm_sch.
800
801config VFIO_CCW
802 def_tristate n
803 prompt "Support for VFIO-CCW subchannels"
804 depends on S390_CCW_IOMMU && VFIO_MDEV
805 help
806 This driver allows usage of I/O subchannels via VFIO-CCW.
807
808 To compile this driver as a module, choose M here: the
809 module will be called vfio_ccw.
810
811config VFIO_AP
812 def_tristate n
813 prompt "VFIO support for AP devices"
814 depends on S390_AP_IOMMU && VFIO_MDEV_DEVICE && KVM
815 help
816 This driver grants access to Adjunct Processor (AP) devices
817 via the VFIO mediated device interface.
818
819 To compile this driver as a module, choose M here: the module
820 will be called vfio_ap.
821
822endmenu
823
824menu "Dump support"
825
826config CRASH_DUMP
827 bool "kernel crash dumps"
828 select KEXEC
829 help
830 Generate crash dump after being started by kexec.
831 Crash dump kernels are loaded in the main kernel with kexec-tools
832 into a specially reserved region and then later executed after
833 a crash by kdump/kexec.
834 Refer to <file:Documentation/s390/zfcpdump.rst> for more details on this.
835 This option also enables s390 zfcpdump.
836 See also <file:Documentation/s390/zfcpdump.rst>
837
838endmenu
839
840config SECCOMP
841 def_bool y
842 prompt "Enable seccomp to safely compute untrusted bytecode"
843 depends on PROC_FS
844 help
845 This kernel feature is useful for number crunching applications
846 that may need to compute untrusted bytecode during their
847 execution. By using pipes or other transports made available to
848 the process as file descriptors supporting the read/write
849 syscalls, it's possible to isolate those applications in
850 their own address space using seccomp. Once seccomp is
851 enabled via /proc/<pid>/seccomp, it cannot be disabled
852 and the task is only allowed to execute a few safe syscalls
853 defined by each seccomp mode.
854
855 If unsure, say Y.
856
857menu "Power Management"
858
859config ARCH_HIBERNATION_POSSIBLE
860 def_bool y
861
862source "kernel/power/Kconfig"
863
864endmenu
865
866config CCW
867 def_bool y
868
869config HAVE_PNETID
870 tristate
871 default (SMC || CCWGROUP)
872
873menu "Virtualization"
874
875config PROTECTED_VIRTUALIZATION_GUEST
876 def_bool n
877 prompt "Protected virtualization guest support"
878 help
879 Select this option, if you want to be able to run this
880 kernel as a protected virtualization KVM guest.
881 Protected virtualization capable machines have a mini hypervisor
882 located at machine level (an ultravisor). With help of the
883 Ultravisor, KVM will be able to run "protected" VMs, special
884 VMs whose memory and management data are unavailable to KVM.
885
886config PFAULT
887 def_bool y
888 prompt "Pseudo page fault support"
889 help
890 Select this option, if you want to use PFAULT pseudo page fault
891 handling under VM. If running native or in LPAR, this option
892 has no effect. If your VM does not support PFAULT, PAGEEX
893 pseudo page fault handling will be used.
894 Note that VM 4.2 supports PFAULT but has a bug in its
895 implementation that causes some problems.
896 Everybody who wants to run Linux under VM != VM4.2 should select
897 this option.
898
899config CMM
900 def_tristate n
901 prompt "Cooperative memory management"
902 help
903 Select this option, if you want to enable the kernel interface
904 to reduce the memory size of the system. This is accomplished
905 by allocating pages of memory and put them "on hold". This only
906 makes sense for a system running under VM where the unused pages
907 will be reused by VM for other guest systems. The interface
908 allows an external monitor to balance memory of many systems.
909 Everybody who wants to run Linux under VM should select this
910 option.
911
912config CMM_IUCV
913 def_bool y
914 prompt "IUCV special message interface to cooperative memory management"
915 depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
916 help
917 Select this option to enable the special message interface to
918 the cooperative memory management.
919
920config APPLDATA_BASE
921 def_bool n
922 prompt "Linux - VM Monitor Stream, base infrastructure"
923 depends on PROC_FS
924 help
925 This provides a kernel interface for creating and updating z/VM APPLDATA
926 monitor records. The monitor records are updated at certain time
927 intervals, once the timer is started.
928 Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
929 i.e. enables or disables monitoring on the Linux side.
930 A custom interval value (in seconds) can be written to
931 /proc/appldata/interval.
932
933 Defaults are 60 seconds interval and timer off.
934 The /proc entries can also be read from, showing the current settings.
935
936config APPLDATA_MEM
937 def_tristate m
938 prompt "Monitor memory management statistics"
939 depends on APPLDATA_BASE && VM_EVENT_COUNTERS
940 help
941 This provides memory management related data to the Linux - VM Monitor
942 Stream, like paging/swapping rate, memory utilisation, etc.
943 Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
944 APPLDATA monitor record, i.e. enables or disables monitoring this record
945 on the z/VM side.
946
947 Default is disabled.
948 The /proc entry can also be read from, showing the current settings.
949
950 This can also be compiled as a module, which will be called
951 appldata_mem.o.
952
953config APPLDATA_OS
954 def_tristate m
955 prompt "Monitor OS statistics"
956 depends on APPLDATA_BASE
957 help
958 This provides OS related data to the Linux - VM Monitor Stream, like
959 CPU utilisation, etc.
960 Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
961 APPLDATA monitor record, i.e. enables or disables monitoring this record
962 on the z/VM side.
963
964 Default is disabled.
965 This can also be compiled as a module, which will be called
966 appldata_os.o.
967
968config APPLDATA_NET_SUM
969 def_tristate m
970 prompt "Monitor overall network statistics"
971 depends on APPLDATA_BASE && NET
972 help
973 This provides network related data to the Linux - VM Monitor Stream,
974 currently there is only a total sum of network I/O statistics, no
975 per-interface data.
976 Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
977 APPLDATA monitor record, i.e. enables or disables monitoring this record
978 on the z/VM side.
979
980 Default is disabled.
981 This can also be compiled as a module, which will be called
982 appldata_net_sum.o.
983
984config S390_HYPFS_FS
985 def_bool y
986 prompt "s390 hypervisor file system support"
987 select SYS_HYPERVISOR
988 help
989 This is a virtual file system intended to provide accounting
990 information in an s390 hypervisor environment.
991
992source "arch/s390/kvm/Kconfig"
993
994config S390_GUEST
995 def_bool y
996 prompt "s390 support for virtio devices"
997 select TTY
998 select VIRTUALIZATION
999 select VIRTIO
1000 select VIRTIO_CONSOLE
1001 help
1002 Enabling this option adds support for virtio based paravirtual device
1003 drivers on s390.
1004
1005 Select this option if you want to run the kernel as a guest under
1006 the KVM hypervisor.
1007
1008endmenu