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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
1# SPDX-License-Identifier: GPL-2.0
2config MMU
3 def_bool y
4
5config CPU_BIG_ENDIAN
6 def_bool y
7
8config LOCKDEP_SUPPORT
9 def_bool y
10
11config STACKTRACE_SUPPORT
12 def_bool y
13
14config ARCH_HAS_ILOG2_U32
15 def_bool n
16
17config ARCH_HAS_ILOG2_U64
18 def_bool n
19
20config ARCH_PROC_KCORE_TEXT
21 def_bool y
22
23config GENERIC_HWEIGHT
24 def_bool !HAVE_MARCH_Z196_FEATURES
25
26config GENERIC_BUG
27 def_bool y if BUG
28
29config GENERIC_BUG_RELATIVE_POINTERS
30 def_bool y
31
32config GENERIC_LOCKBREAK
33 def_bool y if PREEMPTION
34
35config PGSTE
36 def_bool y if KVM
37
38config AUDIT_ARCH
39 def_bool y
40
41config NO_IOPORT_MAP
42 def_bool y
43
44config PCI_QUIRKS
45 def_bool n
46
47config ARCH_SUPPORTS_UPROBES
48 def_bool y
49
50config KASAN_SHADOW_OFFSET
51 hex
52 depends on KASAN
53 default 0x1C000000000000
54
55config GCC_ASM_FLAG_OUTPUT_BROKEN
56 def_bool CC_IS_GCC && GCC_VERSION < 140200
57 help
58 GCC versions before 14.2.0 may die with an internal
59 compiler error in some configurations if flag output
60 operands are used within inline assemblies.
61
62config S390
63 def_bool y
64 #
65 # Note: keep this list sorted alphabetically
66 #
67 imply IMA_SECURE_AND_OR_TRUSTED_BOOT
68 select ALTERNATE_USER_ADDRESS_SPACE
69 select ARCH_32BIT_USTAT_F_TINODE
70 select ARCH_BINFMT_ELF_STATE
71 select ARCH_CORRECT_STACKTRACE_ON_KRETPROBE
72 select ARCH_ENABLE_MEMORY_HOTPLUG if SPARSEMEM
73 select ARCH_ENABLE_MEMORY_HOTREMOVE
74 select ARCH_ENABLE_SPLIT_PMD_PTLOCK if PGTABLE_LEVELS > 2
75 select ARCH_HAS_CPU_FINALIZE_INIT
76 select ARCH_HAS_CURRENT_STACK_POINTER
77 select ARCH_HAS_DEBUG_VIRTUAL
78 select ARCH_HAS_DEBUG_VM_PGTABLE
79 select ARCH_HAS_DEBUG_WX
80 select ARCH_HAS_DEVMEM_IS_ALLOWED
81 select ARCH_HAS_DMA_OPS if PCI
82 select ARCH_HAS_ELF_RANDOMIZE
83 select ARCH_HAS_FORCE_DMA_UNENCRYPTED
84 select ARCH_HAS_FORTIFY_SOURCE
85 select ARCH_HAS_GCOV_PROFILE_ALL
86 select ARCH_HAS_GIGANTIC_PAGE
87 select ARCH_HAS_KCOV
88 select ARCH_HAS_MEMBARRIER_SYNC_CORE
89 select ARCH_HAS_MEM_ENCRYPT
90 select ARCH_HAS_NMI_SAFE_THIS_CPU_OPS
91 select ARCH_HAS_PREEMPT_LAZY
92 select ARCH_HAS_PTE_SPECIAL
93 select ARCH_HAS_SCALED_CPUTIME
94 select ARCH_HAS_SET_DIRECT_MAP
95 select ARCH_HAS_SET_MEMORY
96 select ARCH_HAS_STRICT_KERNEL_RWX
97 select ARCH_HAS_STRICT_MODULE_RWX
98 select ARCH_HAS_SYSCALL_WRAPPER
99 select ARCH_HAS_UBSAN
100 select ARCH_HAS_VDSO_TIME_DATA
101 select ARCH_HAVE_NMI_SAFE_CMPXCHG
102 select ARCH_INLINE_READ_LOCK
103 select ARCH_INLINE_READ_LOCK_BH
104 select ARCH_INLINE_READ_LOCK_IRQ
105 select ARCH_INLINE_READ_LOCK_IRQSAVE
106 select ARCH_INLINE_READ_TRYLOCK
107 select ARCH_INLINE_READ_UNLOCK
108 select ARCH_INLINE_READ_UNLOCK_BH
109 select ARCH_INLINE_READ_UNLOCK_IRQ
110 select ARCH_INLINE_READ_UNLOCK_IRQRESTORE
111 select ARCH_INLINE_SPIN_LOCK
112 select ARCH_INLINE_SPIN_LOCK_BH
113 select ARCH_INLINE_SPIN_LOCK_IRQ
114 select ARCH_INLINE_SPIN_LOCK_IRQSAVE
115 select ARCH_INLINE_SPIN_TRYLOCK
116 select ARCH_INLINE_SPIN_TRYLOCK_BH
117 select ARCH_INLINE_SPIN_UNLOCK
118 select ARCH_INLINE_SPIN_UNLOCK_BH
119 select ARCH_INLINE_SPIN_UNLOCK_IRQ
120 select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE
121 select ARCH_INLINE_WRITE_LOCK
122 select ARCH_INLINE_WRITE_LOCK_BH
123 select ARCH_INLINE_WRITE_LOCK_IRQ
124 select ARCH_INLINE_WRITE_LOCK_IRQSAVE
125 select ARCH_INLINE_WRITE_TRYLOCK
126 select ARCH_INLINE_WRITE_UNLOCK
127 select ARCH_INLINE_WRITE_UNLOCK_BH
128 select ARCH_INLINE_WRITE_UNLOCK_IRQ
129 select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE
130 select ARCH_MHP_MEMMAP_ON_MEMORY_ENABLE
131 select ARCH_STACKWALK
132 select ARCH_SUPPORTS_ATOMIC_RMW
133 select ARCH_SUPPORTS_DEBUG_PAGEALLOC
134 select ARCH_SUPPORTS_HUGETLBFS
135 select ARCH_SUPPORTS_INT128 if CC_HAS_INT128 && CC_IS_CLANG
136 select ARCH_SUPPORTS_NUMA_BALANCING
137 select ARCH_SUPPORTS_PER_VMA_LOCK
138 select ARCH_USE_BUILTIN_BSWAP
139 select ARCH_USE_CMPXCHG_LOCKREF
140 select ARCH_USE_SYM_ANNOTATIONS
141 select ARCH_WANTS_NO_INSTR
142 select ARCH_WANT_DEFAULT_BPF_JIT
143 select ARCH_WANT_IPC_PARSE_VERSION
144 select ARCH_WANT_KERNEL_PMD_MKWRITE
145 select ARCH_WANT_LD_ORPHAN_WARN
146 select ARCH_WANT_OPTIMIZE_HUGETLB_VMEMMAP
147 select BUILDTIME_TABLE_SORT
148 select CLONE_BACKWARDS2
149 select DCACHE_WORD_ACCESS if !KMSAN
150 select DYNAMIC_FTRACE if FUNCTION_TRACER
151 select FUNCTION_ALIGNMENT_8B if CC_IS_GCC
152 select FUNCTION_ALIGNMENT_16B if !CC_IS_GCC
153 select GENERIC_ALLOCATOR
154 select GENERIC_CPU_DEVICES
155 select GENERIC_CPU_AUTOPROBE
156 select GENERIC_CPU_VULNERABILITIES
157 select GENERIC_ENTRY
158 select GENERIC_GETTIMEOFDAY
159 select GENERIC_PTDUMP
160 select GENERIC_SMP_IDLE_THREAD
161 select GENERIC_TIME_VSYSCALL
162 select GENERIC_VDSO_TIME_NS
163 select GENERIC_IOREMAP if PCI
164 select HAVE_ALIGNED_STRUCT_PAGE
165 select HAVE_ARCH_AUDITSYSCALL
166 select HAVE_ARCH_JUMP_LABEL
167 select HAVE_ARCH_JUMP_LABEL_RELATIVE
168 select HAVE_ARCH_KASAN
169 select HAVE_ARCH_KASAN_VMALLOC
170 select HAVE_ARCH_KCSAN
171 select HAVE_ARCH_KMSAN
172 select HAVE_ARCH_KFENCE
173 select HAVE_ARCH_RANDOMIZE_KSTACK_OFFSET
174 select HAVE_ARCH_SECCOMP_FILTER
175 select HAVE_ARCH_SOFT_DIRTY
176 select HAVE_ARCH_STACKLEAK
177 select HAVE_ARCH_TRACEHOOK
178 select HAVE_ARCH_TRANSPARENT_HUGEPAGE
179 select HAVE_ARCH_VMAP_STACK
180 select HAVE_ASM_MODVERSIONS
181 select HAVE_CMPXCHG_DOUBLE
182 select HAVE_CMPXCHG_LOCAL
183 select HAVE_DEBUG_KMEMLEAK
184 select HAVE_DMA_CONTIGUOUS
185 select HAVE_DYNAMIC_FTRACE
186 select HAVE_DYNAMIC_FTRACE_WITH_ARGS
187 select HAVE_DYNAMIC_FTRACE_WITH_DIRECT_CALLS
188 select HAVE_DYNAMIC_FTRACE_WITH_REGS
189 select HAVE_EBPF_JIT if HAVE_MARCH_Z196_FEATURES
190 select HAVE_EFFICIENT_UNALIGNED_ACCESS
191 select HAVE_GUP_FAST
192 select HAVE_FENTRY
193 select HAVE_FTRACE_MCOUNT_RECORD
194 select HAVE_FUNCTION_ARG_ACCESS_API
195 select HAVE_FUNCTION_ERROR_INJECTION
196 select HAVE_FUNCTION_GRAPH_RETVAL
197 select HAVE_FUNCTION_GRAPH_TRACER
198 select HAVE_FUNCTION_TRACER
199 select HAVE_GCC_PLUGINS
200 select HAVE_GENERIC_VDSO
201 select HAVE_IOREMAP_PROT if PCI
202 select HAVE_KERNEL_BZIP2
203 select HAVE_KERNEL_GZIP
204 select HAVE_KERNEL_LZ4
205 select HAVE_KERNEL_LZMA
206 select HAVE_KERNEL_LZO
207 select HAVE_KERNEL_UNCOMPRESSED
208 select HAVE_KERNEL_XZ
209 select HAVE_KERNEL_ZSTD
210 select HAVE_KPROBES
211 select HAVE_KPROBES_ON_FTRACE
212 select HAVE_KRETPROBES
213 select HAVE_LIVEPATCH
214 select HAVE_MEMBLOCK_PHYS_MAP
215 select HAVE_MOD_ARCH_SPECIFIC
216 select HAVE_NMI
217 select HAVE_NOP_MCOUNT
218 select HAVE_PAGE_SIZE_4KB
219 select HAVE_PCI
220 select HAVE_PERF_EVENTS
221 select HAVE_PERF_REGS
222 select HAVE_PERF_USER_STACK_DUMP
223 select HAVE_PREEMPT_DYNAMIC_KEY
224 select HAVE_REGS_AND_STACK_ACCESS_API
225 select HAVE_RELIABLE_STACKTRACE
226 select HAVE_RETHOOK
227 select HAVE_RSEQ
228 select HAVE_SAMPLE_FTRACE_DIRECT
229 select HAVE_SAMPLE_FTRACE_DIRECT_MULTI
230 select HAVE_SETUP_PER_CPU_AREA
231 select HAVE_SOFTIRQ_ON_OWN_STACK
232 select HAVE_SYSCALL_TRACEPOINTS
233 select HAVE_VIRT_CPU_ACCOUNTING
234 select HAVE_VIRT_CPU_ACCOUNTING_IDLE
235 select IOMMU_HELPER if PCI
236 select IOMMU_SUPPORT if PCI
237 select LOCK_MM_AND_FIND_VMA
238 select MMU_GATHER_MERGE_VMAS
239 select MMU_GATHER_NO_GATHER
240 select MMU_GATHER_RCU_TABLE_FREE
241 select MODULES_USE_ELF_RELA
242 select NEED_DMA_MAP_STATE if PCI
243 select NEED_PER_CPU_EMBED_FIRST_CHUNK
244 select NEED_SG_DMA_LENGTH if PCI
245 select OLD_SIGACTION
246 select OLD_SIGSUSPEND3
247 select PCI_DOMAINS if PCI
248 select PCI_MSI if PCI
249 select PCI_MSI_ARCH_FALLBACKS if PCI_MSI
250 select SPARSE_IRQ
251 select SWIOTLB
252 select SYSCTL_EXCEPTION_TRACE
253 select THREAD_INFO_IN_TASK
254 select TRACE_IRQFLAGS_SUPPORT
255 select TTY
256 select USER_STACKTRACE_SUPPORT
257 select VDSO_GETRANDOM
258 select VIRT_CPU_ACCOUNTING
259 select ZONE_DMA
260 # Note: keep the above list sorted alphabetically
261
262config SCHED_OMIT_FRAME_POINTER
263 def_bool y
264
265config PGTABLE_LEVELS
266 int
267 default 5
268
269source "kernel/livepatch/Kconfig"
270
271config ARCH_SUPPORTS_KEXEC
272 def_bool y
273
274config ARCH_SUPPORTS_KEXEC_FILE
275 def_bool y
276
277config ARCH_SUPPORTS_KEXEC_SIG
278 def_bool MODULE_SIG_FORMAT
279
280config ARCH_SUPPORTS_KEXEC_PURGATORY
281 def_bool y
282
283config ARCH_SUPPORTS_CRASH_DUMP
284 def_bool y
285 help
286 Refer to <file:Documentation/arch/s390/zfcpdump.rst> for more details on this.
287 This option also enables s390 zfcpdump.
288 See also <file:Documentation/arch/s390/zfcpdump.rst>
289
290config ARCH_DEFAULT_CRASH_DUMP
291 def_bool y
292
293menu "Processor type and features"
294
295config HAVE_MARCH_Z10_FEATURES
296 def_bool n
297
298config HAVE_MARCH_Z196_FEATURES
299 def_bool n
300 select HAVE_MARCH_Z10_FEATURES
301
302config HAVE_MARCH_ZEC12_FEATURES
303 def_bool n
304 select HAVE_MARCH_Z196_FEATURES
305
306config HAVE_MARCH_Z13_FEATURES
307 def_bool n
308 select HAVE_MARCH_ZEC12_FEATURES
309
310config HAVE_MARCH_Z14_FEATURES
311 def_bool n
312 select HAVE_MARCH_Z13_FEATURES
313
314config HAVE_MARCH_Z15_FEATURES
315 def_bool n
316 select HAVE_MARCH_Z14_FEATURES
317
318config HAVE_MARCH_Z16_FEATURES
319 def_bool n
320 select HAVE_MARCH_Z15_FEATURES
321
322choice
323 prompt "Processor type"
324 default MARCH_Z196
325
326config MARCH_Z10
327 bool "IBM System z10"
328 select HAVE_MARCH_Z10_FEATURES
329 depends on $(cc-option,-march=z10)
330 help
331 Select this to enable optimizations for IBM System z10 (2097 and 2098
332 series). This is the oldest machine generation currently supported.
333
334config MARCH_Z196
335 bool "IBM zEnterprise 114 and 196"
336 select HAVE_MARCH_Z196_FEATURES
337 depends on $(cc-option,-march=z196)
338 help
339 Select this to enable optimizations for IBM zEnterprise 114 and 196
340 (2818 and 2817 series). The kernel will be slightly faster but will
341 not work on older machines.
342
343config MARCH_ZEC12
344 bool "IBM zBC12 and zEC12"
345 select HAVE_MARCH_ZEC12_FEATURES
346 depends on $(cc-option,-march=zEC12)
347 help
348 Select this to enable optimizations for IBM zBC12 and zEC12 (2828 and
349 2827 series). The kernel will be slightly faster but will not work on
350 older machines.
351
352config MARCH_Z13
353 bool "IBM z13s and z13"
354 select HAVE_MARCH_Z13_FEATURES
355 depends on $(cc-option,-march=z13)
356 help
357 Select this to enable optimizations for IBM z13s and z13 (2965 and
358 2964 series). The kernel will be slightly faster but will not work on
359 older machines.
360
361config MARCH_Z14
362 bool "IBM z14 ZR1 and z14"
363 select HAVE_MARCH_Z14_FEATURES
364 depends on $(cc-option,-march=z14)
365 help
366 Select this to enable optimizations for IBM z14 ZR1 and z14 (3907
367 and 3906 series). The kernel will be slightly faster but will not
368 work on older machines.
369
370config MARCH_Z15
371 bool "IBM z15"
372 select HAVE_MARCH_Z15_FEATURES
373 depends on $(cc-option,-march=z15)
374 help
375 Select this to enable optimizations for IBM z15 (8562
376 and 8561 series). The kernel will be slightly faster but will not
377 work on older machines.
378
379config MARCH_Z16
380 bool "IBM z16"
381 select HAVE_MARCH_Z16_FEATURES
382 depends on $(cc-option,-march=z16)
383 help
384 Select this to enable optimizations for IBM z16 (3931 and
385 3932 series).
386
387endchoice
388
389config MARCH_Z10_TUNE
390 def_bool TUNE_Z10 || MARCH_Z10 && TUNE_DEFAULT
391
392config MARCH_Z196_TUNE
393 def_bool TUNE_Z196 || MARCH_Z196 && TUNE_DEFAULT
394
395config MARCH_ZEC12_TUNE
396 def_bool TUNE_ZEC12 || MARCH_ZEC12 && TUNE_DEFAULT
397
398config MARCH_Z13_TUNE
399 def_bool TUNE_Z13 || MARCH_Z13 && TUNE_DEFAULT
400
401config MARCH_Z14_TUNE
402 def_bool TUNE_Z14 || MARCH_Z14 && TUNE_DEFAULT
403
404config MARCH_Z15_TUNE
405 def_bool TUNE_Z15 || MARCH_Z15 && TUNE_DEFAULT
406
407config MARCH_Z16_TUNE
408 def_bool TUNE_Z16 || MARCH_Z16 && TUNE_DEFAULT
409
410choice
411 prompt "Tune code generation"
412 default TUNE_DEFAULT
413 help
414 Cause the compiler to tune (-mtune) the generated code for a machine.
415 This will make the code run faster on the selected machine but
416 somewhat slower on other machines.
417 This option only changes how the compiler emits instructions, not the
418 selection of instructions itself, so the resulting kernel will run on
419 all other machines.
420
421config TUNE_DEFAULT
422 bool "Default"
423 help
424 Tune the generated code for the target processor for which the kernel
425 will be compiled.
426
427config TUNE_Z10
428 bool "IBM System z10"
429
430config TUNE_Z196
431 bool "IBM zEnterprise 114 and 196"
432 depends on $(cc-option,-mtune=z196)
433
434config TUNE_ZEC12
435 bool "IBM zBC12 and zEC12"
436 depends on $(cc-option,-mtune=zEC12)
437
438config TUNE_Z13
439 bool "IBM z13s and z13"
440 depends on $(cc-option,-mtune=z13)
441
442config TUNE_Z14
443 bool "IBM z14 ZR1 and z14"
444 depends on $(cc-option,-mtune=z14)
445
446config TUNE_Z15
447 bool "IBM z15"
448 depends on $(cc-option,-mtune=z15)
449
450config TUNE_Z16
451 bool "IBM z16"
452 depends on $(cc-option,-mtune=z16)
453
454endchoice
455
456config 64BIT
457 def_bool y
458
459config COMMAND_LINE_SIZE
460 int "Maximum size of kernel command line"
461 default 4096
462 range 896 1048576
463 help
464 This allows you to specify the maximum length of the kernel command
465 line.
466
467config COMPAT
468 def_bool n
469 prompt "Kernel support for 31 bit emulation"
470 select ARCH_WANT_OLD_COMPAT_IPC
471 select COMPAT_OLD_SIGACTION
472 select HAVE_UID16
473 depends on MULTIUSER
474 depends on !CC_IS_CLANG && !LD_IS_LLD
475 help
476 Select this option if you want to enable your system kernel to
477 handle system-calls from ELF binaries for 31 bit ESA. This option
478 (and some other stuff like libraries and such) is needed for
479 executing 31 bit applications.
480
481 If unsure say N.
482
483config SMP
484 def_bool y
485
486config NR_CPUS
487 int "Maximum number of CPUs (2-512)"
488 range 2 512
489 default "64"
490 help
491 This allows you to specify the maximum number of CPUs which this
492 kernel will support. The maximum supported value is 512 and the
493 minimum value which makes sense is 2.
494
495 This is purely to save memory - each supported CPU adds
496 approximately sixteen kilobytes to the kernel image.
497
498config HOTPLUG_CPU
499 def_bool y
500
501config NUMA
502 bool "NUMA support"
503 depends on SCHED_TOPOLOGY
504 default n
505 help
506 Enable NUMA support
507
508 This option adds NUMA support to the kernel.
509
510config NODES_SHIFT
511 int
512 depends on NUMA
513 default "1"
514
515config SCHED_SMT
516 def_bool n
517
518config SCHED_MC
519 def_bool n
520
521config SCHED_TOPOLOGY
522 def_bool y
523 prompt "Topology scheduler support"
524 select SCHED_SMT
525 select SCHED_MC
526 help
527 Topology scheduler support improves the CPU scheduler's decision
528 making when dealing with machines that have multi-threading,
529 multiple cores or multiple books.
530
531config SCHED_TOPOLOGY_VERTICAL
532 def_bool y
533 bool "Use vertical CPU polarization by default"
534 depends on SCHED_TOPOLOGY
535 help
536 Use vertical CPU polarization by default if available.
537 The default CPU polarization is horizontal.
538
539config HIPERDISPATCH_ON
540 def_bool y
541 bool "Use hiperdispatch on vertical polarization by default"
542 depends on SCHED_TOPOLOGY
543 depends on PROC_SYSCTL
544 help
545 Hiperdispatch aims to improve the CPU scheduler's decision
546 making when using vertical polarization by adjusting CPU
547 capacities dynamically. Set this option to use hiperdispatch
548 on vertical polarization by default. This can be overwritten
549 by sysctl's s390.hiperdispatch attribute later on.
550
551source "kernel/Kconfig.hz"
552
553config CERT_STORE
554 bool "Get user certificates via DIAG320"
555 depends on KEYS
556 select CRYPTO_LIB_SHA256
557 help
558 Enable this option if you want to access user-provided secure boot
559 certificates via DIAG 0x320.
560
561 These certificates will be made available via the keyring named
562 'cert_store'.
563
564config KERNEL_NOBP
565 def_bool n
566 prompt "Enable modified branch prediction for the kernel by default"
567 help
568 If this option is selected the kernel will switch to a modified
569 branch prediction mode if the firmware interface is available.
570 The modified branch prediction mode improves the behaviour in
571 regard to speculative execution.
572
573 With the option enabled the kernel parameter "nobp=0" or "nospec"
574 can be used to run the kernel in the normal branch prediction mode.
575
576 With the option disabled the modified branch prediction mode is
577 enabled with the "nobp=1" kernel parameter.
578
579 If unsure, say N.
580
581config EXPOLINE
582 def_bool n
583 depends on $(cc-option,-mindirect-branch=thunk)
584 prompt "Avoid speculative indirect branches in the kernel"
585 help
586 Compile the kernel with the expoline compiler options to guard
587 against kernel-to-user data leaks by avoiding speculative indirect
588 branches.
589 Requires a compiler with -mindirect-branch=thunk support for full
590 protection. The kernel may run slower.
591
592 If unsure, say N.
593
594config EXPOLINE_EXTERN
595 def_bool EXPOLINE && CC_IS_GCC && GCC_VERSION >= 110200 && \
596 $(success,$(srctree)/arch/s390/tools/gcc-thunk-extern.sh $(CC))
597 help
598 Generate expolines as external functions if the compiler supports it.
599 This option is required for some tooling like kpatch, if expolines
600 are enabled. The kernel is compiled with
601 -mindirect-branch=thunk-extern, which requires a newer compiler.
602
603choice
604 prompt "Expoline default"
605 depends on EXPOLINE
606 default EXPOLINE_FULL
607
608config EXPOLINE_OFF
609 bool "spectre_v2=off"
610
611config EXPOLINE_AUTO
612 bool "spectre_v2=auto"
613
614config EXPOLINE_FULL
615 bool "spectre_v2=on"
616
617endchoice
618
619config RELOCATABLE
620 def_bool y
621 help
622 This builds a kernel image that retains relocation information
623 so it can be loaded at an arbitrary address.
624 The relocations make the kernel image about 15% larger (compressed
625 10%), but are discarded at runtime.
626 Note: this option exists only for documentation purposes, please do
627 not remove it.
628
629config RANDOMIZE_BASE
630 bool "Randomize the address of the kernel image (KASLR)"
631 default y
632 help
633 In support of Kernel Address Space Layout Randomization (KASLR),
634 this randomizes the address at which the kernel image is loaded,
635 as a security feature that deters exploit attempts relying on
636 knowledge of the location of kernel internals.
637
638config RANDOMIZE_IDENTITY_BASE
639 bool "Randomize the address of the identity mapping base"
640 depends on RANDOMIZE_BASE
641 default DEBUG_VM
642 help
643 The identity mapping base address is pinned to zero by default.
644 Allow randomization of that base to expose otherwise missed
645 notion of physical and virtual addresses of data structures.
646 That does not have any impact on the base address at which the
647 kernel image is loaded.
648
649 If unsure, say N
650
651config KERNEL_IMAGE_BASE
652 hex "Kernel image base address"
653 range 0x100000 0x1FFFFFE0000000 if !KASAN
654 range 0x100000 0x1BFFFFE0000000 if KASAN
655 default 0x3FFE0000000 if !KASAN
656 default 0x7FFFE0000000 if KASAN
657 help
658 This is the address at which the kernel image is loaded in case
659 Kernel Address Space Layout Randomization (KASLR) is disabled.
660
661 In case the Protected virtualization guest support is enabled the
662 Ultravisor imposes a virtual address limit. If the value of this
663 option leads to the kernel image exceeding the Ultravisor limit,
664 this option is ignored and the image is loaded below the limit.
665
666 If the value of this option leads to the kernel image overlapping
667 the virtual memory where other data structures are located, this
668 option is ignored and the image is loaded above the structures.
669
670endmenu
671
672menu "Memory setup"
673
674config ARCH_SPARSEMEM_ENABLE
675 def_bool y
676 select SPARSEMEM_VMEMMAP_ENABLE
677 select SPARSEMEM_VMEMMAP
678
679config ARCH_SPARSEMEM_DEFAULT
680 def_bool y
681
682config MAX_PHYSMEM_BITS
683 int "Maximum size of supported physical memory in bits (42-53)"
684 range 42 53
685 default "46"
686 help
687 This option specifies the maximum supported size of physical memory
688 in bits. Supported is any size between 2^42 (4TB) and 2^53 (8PB).
689 Increasing the number of bits also increases the kernel image size.
690 By default 46 bits (64TB) are supported.
691
692config CHECK_STACK
693 def_bool y
694 depends on !VMAP_STACK
695 prompt "Detect kernel stack overflow"
696 help
697 This option enables the compiler option -mstack-guard and
698 -mstack-size if they are available. If the compiler supports them
699 it will emit additional code to each function prolog to trigger
700 an illegal operation if the kernel stack is about to overflow.
701
702 Say N if you are unsure.
703
704config STACK_GUARD
705 int "Size of the guard area (128-1024)"
706 range 128 1024
707 depends on CHECK_STACK
708 default "256"
709 help
710 This allows you to specify the size of the guard area at the lower
711 end of the kernel stack. If the kernel stack points into the guard
712 area on function entry an illegal operation is triggered. The size
713 needs to be a power of 2. Please keep in mind that the size of an
714 interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
715 The minimum size for the stack guard should be 256 for 31 bit and
716 512 for 64 bit.
717
718endmenu
719
720menu "I/O subsystem"
721
722config QDIO
723 def_tristate y
724 prompt "QDIO support"
725 help
726 This driver provides the Queued Direct I/O base support for
727 IBM System z.
728
729 To compile this driver as a module, choose M here: the
730 module will be called qdio.
731
732 If unsure, say Y.
733
734if PCI
735
736config PCI_NR_FUNCTIONS
737 int "Maximum number of PCI functions (1-4096)"
738 range 1 4096
739 default "512"
740 help
741 This allows you to specify the maximum number of PCI functions which
742 this kernel will support.
743
744endif # PCI
745
746config HAS_IOMEM
747 def_bool PCI
748
749config CHSC_SCH
750 def_tristate m
751 prompt "Support for CHSC subchannels"
752 help
753 This driver allows usage of CHSC subchannels. A CHSC subchannel
754 is usually present on LPAR only.
755 The driver creates a device /dev/chsc, which may be used to
756 obtain I/O configuration information about the machine and
757 to issue asynchronous chsc commands (DANGEROUS).
758 You will usually only want to use this interface on a special
759 LPAR designated for system management.
760
761 To compile this driver as a module, choose M here: the
762 module will be called chsc_sch.
763
764 If unsure, say N.
765
766config SCM_BUS
767 def_bool y
768 prompt "SCM bus driver"
769 help
770 Bus driver for Storage Class Memory.
771
772config EADM_SCH
773 def_tristate m
774 prompt "Support for EADM subchannels"
775 depends on SCM_BUS
776 help
777 This driver allows usage of EADM subchannels. EADM subchannels act
778 as a communication vehicle for SCM increments.
779
780 To compile this driver as a module, choose M here: the
781 module will be called eadm_sch.
782
783config AP
784 def_tristate y
785 prompt "Support for Adjunct Processors (ap)"
786 help
787 This driver allows usage to Adjunct Processor (AP) devices via
788 the ap bus, cards and queues. Supported Adjunct Processors are
789 the CryptoExpress Cards (CEX).
790
791 To compile this driver as a module, choose M here: the
792 module will be called ap.
793
794 If unsure, say Y (default).
795
796config AP_DEBUG
797 def_bool n
798 prompt "Enable debug features for Adjunct Processor (ap) devices"
799 depends on AP
800 help
801 Say 'Y' here to enable some additional debug features for Adjunct
802 Processor (ap) devices.
803
804 There will be some more sysfs attributes displayed for ap queues.
805
806 Do not enable on production level kernel build.
807
808 If unsure, say N.
809
810config VFIO_CCW
811 def_tristate n
812 prompt "Support for VFIO-CCW subchannels"
813 depends on VFIO
814 select VFIO_MDEV
815 help
816 This driver allows usage of I/O subchannels via VFIO-CCW.
817
818 To compile this driver as a module, choose M here: the
819 module will be called vfio_ccw.
820
821config VFIO_AP
822 def_tristate n
823 prompt "VFIO support for AP devices"
824 depends on KVM
825 depends on VFIO
826 depends on AP
827 select VFIO_MDEV
828 help
829 This driver grants access to Adjunct Processor (AP) devices
830 via the VFIO mediated device interface.
831
832 To compile this driver as a module, choose M here: the module
833 will be called vfio_ap.
834
835endmenu
836
837config CCW
838 def_bool y
839
840config HAVE_PNETID
841 tristate
842 default (SMC || CCWGROUP)
843
844menu "Virtualization"
845
846config PFAULT
847 def_bool y
848 prompt "Pseudo page fault support"
849 help
850 Select this option, if you want to use PFAULT pseudo page fault
851 handling under VM. If running native or in LPAR, this option
852 has no effect. If your VM does not support PFAULT, PAGEEX
853 pseudo page fault handling will be used.
854 Note that VM 4.2 supports PFAULT but has a bug in its
855 implementation that causes some problems.
856 Everybody who wants to run Linux under VM != VM4.2 should select
857 this option.
858
859config CMM
860 def_tristate n
861 prompt "Cooperative memory management"
862 help
863 Select this option, if you want to enable the kernel interface
864 to reduce the memory size of the system. This is accomplished
865 by allocating pages of memory and put them "on hold". This only
866 makes sense for a system running under VM where the unused pages
867 will be reused by VM for other guest systems. The interface
868 allows an external monitor to balance memory of many systems.
869 Everybody who wants to run Linux under VM should select this
870 option.
871
872config CMM_IUCV
873 def_bool y
874 prompt "IUCV special message interface to cooperative memory management"
875 depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
876 help
877 Select this option to enable the special message interface to
878 the cooperative memory management.
879
880config APPLDATA_BASE
881 def_bool n
882 prompt "Linux - VM Monitor Stream, base infrastructure"
883 depends on PROC_SYSCTL
884 help
885 This provides a kernel interface for creating and updating z/VM APPLDATA
886 monitor records. The monitor records are updated at certain time
887 intervals, once the timer is started.
888 Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
889 i.e. enables or disables monitoring on the Linux side.
890 A custom interval value (in seconds) can be written to
891 /proc/appldata/interval.
892
893 Defaults are 60 seconds interval and timer off.
894 The /proc entries can also be read from, showing the current settings.
895
896config APPLDATA_MEM
897 def_tristate m
898 prompt "Monitor memory management statistics"
899 depends on APPLDATA_BASE && VM_EVENT_COUNTERS
900 help
901 This provides memory management related data to the Linux - VM Monitor
902 Stream, like paging/swapping rate, memory utilisation, etc.
903 Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
904 APPLDATA monitor record, i.e. enables or disables monitoring this record
905 on the z/VM side.
906
907 Default is disabled.
908 The /proc entry can also be read from, showing the current settings.
909
910 This can also be compiled as a module, which will be called
911 appldata_mem.o.
912
913config APPLDATA_OS
914 def_tristate m
915 prompt "Monitor OS statistics"
916 depends on APPLDATA_BASE
917 help
918 This provides OS related data to the Linux - VM Monitor Stream, like
919 CPU utilisation, etc.
920 Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
921 APPLDATA monitor record, i.e. enables or disables monitoring this record
922 on the z/VM side.
923
924 Default is disabled.
925 This can also be compiled as a module, which will be called
926 appldata_os.o.
927
928config APPLDATA_NET_SUM
929 def_tristate m
930 prompt "Monitor overall network statistics"
931 depends on APPLDATA_BASE && NET
932 help
933 This provides network related data to the Linux - VM Monitor Stream,
934 currently there is only a total sum of network I/O statistics, no
935 per-interface data.
936 Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
937 APPLDATA monitor record, i.e. enables or disables monitoring this record
938 on the z/VM side.
939
940 Default is disabled.
941 This can also be compiled as a module, which will be called
942 appldata_net_sum.o.
943
944config S390_HYPFS
945 def_bool y
946 prompt "s390 hypervisor information"
947 help
948 This provides several binary files at (debugfs)/s390_hypfs/ to
949 provide accounting information in an s390 hypervisor environment.
950
951config S390_HYPFS_FS
952 def_bool n
953 prompt "s390 hypervisor file system support"
954 select SYS_HYPERVISOR
955 depends on S390_HYPFS
956 help
957 This is a virtual file system intended to provide accounting
958 information in an s390 hypervisor environment. This file system
959 is deprecated and should not be used.
960
961 Say N if you are unsure.
962
963source "arch/s390/kvm/Kconfig"
964
965config S390_GUEST
966 def_bool y
967 prompt "s390 support for virtio devices"
968 select TTY
969 select VIRTUALIZATION
970 select VIRTIO
971 help
972 Enabling this option adds support for virtio based paravirtual device
973 drivers on s390.
974
975 Select this option if you want to run the kernel as a guest under
976 the KVM hypervisor.
977
978endmenu
979
980config S390_MODULES_SANITY_TEST_HELPERS
981 def_bool n
982
983menu "Selftests"
984
985config S390_UNWIND_SELFTEST
986 def_tristate n
987 depends on KUNIT
988 default KUNIT_ALL_TESTS
989 prompt "Test unwind functions"
990 help
991 This option enables s390 specific stack unwinder testing kernel
992 module. This option is not useful for distributions or general
993 kernels, but only for kernel developers working on architecture code.
994
995 Say N if you are unsure.
996
997config S390_KPROBES_SANITY_TEST
998 def_tristate n
999 prompt "Enable s390 specific kprobes tests"
1000 depends on KPROBES
1001 depends on KUNIT
1002 help
1003 This option enables an s390 specific kprobes test module. This option
1004 is not useful for distributions or general kernels, but only for kernel
1005 developers working on architecture code.
1006
1007 Say N if you are unsure.
1008
1009config S390_MODULES_SANITY_TEST
1010 def_tristate n
1011 depends on KUNIT
1012 default KUNIT_ALL_TESTS
1013 prompt "Enable s390 specific modules tests"
1014 select S390_MODULES_SANITY_TEST_HELPERS
1015 help
1016 This option enables an s390 specific modules test. This option is
1017 not useful for distributions or general kernels, but only for
1018 kernel developers working on architecture code.
1019
1020 Say N if you are unsure.
1021endmenu