| blob | 7eeb75d758c196449e6ed90527c731b945e97e49 |
1 config MMU
2 def_bool y
4 config ZONE_DMA
5 def_bool y
7 config CPU_BIG_ENDIAN
8 def_bool y
10 config LOCKDEP_SUPPORT
11 def_bool y
13 config STACKTRACE_SUPPORT
14 def_bool y
16 config RWSEM_GENERIC_SPINLOCK
17 bool
19 config RWSEM_XCHGADD_ALGORITHM
20 def_bool y
22 config ARCH_HAS_ILOG2_U32
23 def_bool n
25 config ARCH_HAS_ILOG2_U64
26 def_bool n
28 config GENERIC_HWEIGHT
29 def_bool y
31 config GENERIC_BUG
32 def_bool y if BUG
34 config GENERIC_BUG_RELATIVE_POINTERS
35 def_bool y
37 config ARCH_DMA_ADDR_T_64BIT
38 def_bool y
40 config GENERIC_LOCKBREAK
41 def_bool y if SMP && PREEMPT
43 config PGSTE
44 def_bool y if KVM
46 config ARCH_SUPPORTS_DEBUG_PAGEALLOC
47 def_bool y
49 config KEXEC
50 def_bool y
51 select KEXEC_CORE
53 config AUDIT_ARCH
54 def_bool y
56 config NO_IOPORT_MAP
57 def_bool y
59 config PCI_QUIRKS
60 def_bool n
62 config ARCH_SUPPORTS_UPROBES
63 def_bool y
65 config S390
66 def_bool y
67 select ARCH_BINFMT_ELF_STATE
68 select ARCH_HAS_DEVMEM_IS_ALLOWED
69 select ARCH_HAS_ELF_RANDOMIZE
70 select ARCH_HAS_GCOV_PROFILE_ALL
71 select ARCH_HAS_GIGANTIC_PAGE if (MEMORY_ISOLATION && COMPACTION) || CMA
72 select ARCH_HAS_KCOV
73 select ARCH_HAS_SET_MEMORY
74 select ARCH_HAS_SG_CHAIN
75 select ARCH_HAS_STRICT_KERNEL_RWX
76 select ARCH_HAS_STRICT_MODULE_RWX
77 select ARCH_HAS_UBSAN_SANITIZE_ALL
78 select ARCH_HAVE_NMI_SAFE_CMPXCHG
79 select ARCH_INLINE_READ_LOCK
80 select ARCH_INLINE_READ_LOCK_BH
81 select ARCH_INLINE_READ_LOCK_IRQ
82 select ARCH_INLINE_READ_LOCK_IRQSAVE
83 select ARCH_INLINE_READ_TRYLOCK
84 select ARCH_INLINE_READ_UNLOCK
85 select ARCH_INLINE_READ_UNLOCK_BH
86 select ARCH_INLINE_READ_UNLOCK_IRQ
87 select ARCH_INLINE_READ_UNLOCK_IRQRESTORE
88 select ARCH_INLINE_SPIN_LOCK
89 select ARCH_INLINE_SPIN_LOCK_BH
90 select ARCH_INLINE_SPIN_LOCK_IRQ
91 select ARCH_INLINE_SPIN_LOCK_IRQSAVE
92 select ARCH_INLINE_SPIN_TRYLOCK
93 select ARCH_INLINE_SPIN_TRYLOCK_BH
94 select ARCH_INLINE_SPIN_UNLOCK
95 select ARCH_INLINE_SPIN_UNLOCK_BH
96 select ARCH_INLINE_SPIN_UNLOCK_IRQ
97 select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE
98 select ARCH_INLINE_WRITE_LOCK
99 select ARCH_INLINE_WRITE_LOCK_BH
100 select ARCH_INLINE_WRITE_LOCK_IRQ
101 select ARCH_INLINE_WRITE_LOCK_IRQSAVE
102 select ARCH_INLINE_WRITE_TRYLOCK
103 select ARCH_INLINE_WRITE_UNLOCK
104 select ARCH_INLINE_WRITE_UNLOCK_BH
105 select ARCH_INLINE_WRITE_UNLOCK_IRQ
106 select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE
107 select ARCH_SAVE_PAGE_KEYS if HIBERNATION
108 select ARCH_SUPPORTS_ATOMIC_RMW
109 select ARCH_SUPPORTS_DEFERRED_STRUCT_PAGE_INIT
110 select ARCH_SUPPORTS_NUMA_BALANCING
111 select ARCH_USE_BUILTIN_BSWAP
112 select ARCH_USE_CMPXCHG_LOCKREF
113 select ARCH_WANTS_DYNAMIC_TASK_STRUCT
114 select ARCH_WANTS_PROT_NUMA_PROT_NONE
115 select ARCH_WANTS_UBSAN_NO_NULL
116 select ARCH_WANT_IPC_PARSE_VERSION
117 select BUILDTIME_EXTABLE_SORT
118 select CLONE_BACKWARDS2
119 select DYNAMIC_FTRACE if FUNCTION_TRACER
120 select GENERIC_CLOCKEVENTS
121 select GENERIC_CPU_AUTOPROBE
122 select GENERIC_CPU_DEVICES if !SMP
123 select GENERIC_FIND_FIRST_BIT
124 select GENERIC_SMP_IDLE_THREAD
125 select GENERIC_TIME_VSYSCALL
126 select HAVE_ALIGNED_STRUCT_PAGE if SLUB
127 select HAVE_ARCH_AUDITSYSCALL
128 select HAVE_ARCH_JUMP_LABEL
129 select CPU_NO_EFFICIENT_FFS if !HAVE_MARCH_Z9_109_FEATURES
130 select HAVE_ARCH_SECCOMP_FILTER
131 select HAVE_ARCH_SOFT_DIRTY
132 select HAVE_ARCH_TRACEHOOK
133 select HAVE_ARCH_TRANSPARENT_HUGEPAGE
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_API_DEBUG
140 select HAVE_DMA_CONTIGUOUS
141 select DMA_NOOP_OPS
142 select HAVE_DYNAMIC_FTRACE
143 select HAVE_DYNAMIC_FTRACE_WITH_REGS
144 select HAVE_EFFICIENT_UNALIGNED_ACCESS
145 select HAVE_EXIT_THREAD
146 select HAVE_FTRACE_MCOUNT_RECORD
147 select HAVE_FUNCTION_GRAPH_TRACER
148 select HAVE_FUNCTION_TRACER
149 select HAVE_FUTEX_CMPXCHG if FUTEX
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_XZ
156 select HAVE_KPROBES
157 select HAVE_KRETPROBES
158 select HAVE_KVM
159 select HAVE_LIVEPATCH
160 select HAVE_MEMBLOCK
161 select HAVE_MEMBLOCK_NODE_MAP
162 select HAVE_MEMBLOCK_PHYS_MAP
163 select HAVE_MOD_ARCH_SPECIFIC
164 select HAVE_OPROFILE
165 select HAVE_PERF_EVENTS
166 select HAVE_REGS_AND_STACK_ACCESS_API
167 select HAVE_SYSCALL_TRACEPOINTS
168 select HAVE_VIRT_CPU_ACCOUNTING
169 select MODULES_USE_ELF_RELA
170 select NO_BOOTMEM
171 select OLD_SIGACTION
172 select OLD_SIGSUSPEND3
173 select SPARSE_IRQ
174 select SYSCTL_EXCEPTION_TRACE
175 select THREAD_INFO_IN_TASK
176 select TTY
177 select VIRT_CPU_ACCOUNTING
178 select ARCH_HAS_SCALED_CPUTIME
179 select VIRT_TO_BUS
180 select HAVE_NMI
183 config SCHED_OMIT_FRAME_POINTER
184 def_bool y
186 config PGTABLE_LEVELS
187 int
188 default 5
190 source "init/Kconfig"
192 source "kernel/Kconfig.freezer"
194 source "kernel/livepatch/Kconfig"
196 menu "Processor type and features"
198 config HAVE_MARCH_Z900_FEATURES
199 def_bool n
201 config HAVE_MARCH_Z990_FEATURES
202 def_bool n
203 select HAVE_MARCH_Z900_FEATURES
205 config HAVE_MARCH_Z9_109_FEATURES
206 def_bool n
207 select HAVE_MARCH_Z990_FEATURES
209 config HAVE_MARCH_Z10_FEATURES
210 def_bool n
211 select HAVE_MARCH_Z9_109_FEATURES
213 config HAVE_MARCH_Z196_FEATURES
214 def_bool n
215 select HAVE_MARCH_Z10_FEATURES
217 config HAVE_MARCH_ZEC12_FEATURES
218 def_bool n
219 select HAVE_MARCH_Z196_FEATURES
221 config HAVE_MARCH_Z13_FEATURES
222 def_bool n
223 select HAVE_MARCH_ZEC12_FEATURES
225 choice
226 prompt "Processor type"
227 default MARCH_Z196
229 config MARCH_Z900
230 bool "IBM zSeries model z800 and z900"
231 select HAVE_MARCH_Z900_FEATURES
232 help
233 Select this to enable optimizations for model z800/z900 (2064 and
234 2066 series). This will enable some optimizations that are not
235 available on older ESA/390 (31 Bit) only CPUs.
237 config MARCH_Z990
238 bool "IBM zSeries model z890 and z990"
239 select HAVE_MARCH_Z990_FEATURES
240 help
241 Select this to enable optimizations for model z890/z990 (2084 and
242 2086 series). The kernel will be slightly faster but will not work
243 on older machines.
245 config MARCH_Z9_109
246 bool "IBM System z9"
247 select HAVE_MARCH_Z9_109_FEATURES
248 help
249 Select this to enable optimizations for IBM System z9 (2094 and
250 2096 series). The kernel will be slightly faster but will not work
251 on older machines.
253 config MARCH_Z10
254 bool "IBM System z10"
255 select HAVE_MARCH_Z10_FEATURES
256 help
257 Select this to enable optimizations for IBM System z10 (2097 and
258 2098 series). The kernel will be slightly faster but will not work
259 on older machines.
261 config MARCH_Z196
262 bool "IBM zEnterprise 114 and 196"
263 select HAVE_MARCH_Z196_FEATURES
264 help
265 Select this to enable optimizations for IBM zEnterprise 114 and 196
266 (2818 and 2817 series). The kernel will be slightly faster but will
267 not work on older machines.
269 config MARCH_ZEC12
270 bool "IBM zBC12 and zEC12"
271 select HAVE_MARCH_ZEC12_FEATURES
272 help
273 Select this to enable optimizations for IBM zBC12 and zEC12 (2828 and
274 2827 series). The kernel will be slightly faster but will not work on
275 older machines.
277 config MARCH_Z13
278 bool "IBM z13s and z13"
279 select HAVE_MARCH_Z13_FEATURES
280 help
281 Select this to enable optimizations for IBM z13s and z13 (2965 and
282 2964 series). The kernel will be slightly faster but will not work on
283 older machines.
285 endchoice
287 config MARCH_Z900_TUNE
288 def_bool TUNE_Z900 || MARCH_Z900 && TUNE_DEFAULT
290 config MARCH_Z990_TUNE
291 def_bool TUNE_Z990 || MARCH_Z990 && TUNE_DEFAULT
293 config MARCH_Z9_109_TUNE
294 def_bool TUNE_Z9_109 || MARCH_Z9_109 && TUNE_DEFAULT
296 config MARCH_Z10_TUNE
297 def_bool TUNE_Z10 || MARCH_Z10 && TUNE_DEFAULT
299 config MARCH_Z196_TUNE
300 def_bool TUNE_Z196 || MARCH_Z196 && TUNE_DEFAULT
302 config MARCH_ZEC12_TUNE
303 def_bool TUNE_ZEC12 || MARCH_ZEC12 && TUNE_DEFAULT
305 config MARCH_Z13_TUNE
306 def_bool TUNE_Z13 || MARCH_Z13 && TUNE_DEFAULT
308 choice
309 prompt "Tune code generation"
310 default TUNE_DEFAULT
311 help
312 Cause the compiler to tune (-mtune) the generated code for a machine.
313 This will make the code run faster on the selected machine but
314 somewhat slower on other machines.
315 This option only changes how the compiler emits instructions, not the
316 selection of instructions itself, so the resulting kernel will run on
317 all other machines.
319 config TUNE_DEFAULT
320 bool "Default"
321 help
322 Tune the generated code for the target processor for which the kernel
323 will be compiled.
325 config TUNE_Z900
326 bool "IBM zSeries model z800 and z900"
328 config TUNE_Z990
329 bool "IBM zSeries model z890 and z990"
331 config TUNE_Z9_109
332 bool "IBM System z9"
334 config TUNE_Z10
335 bool "IBM System z10"
337 config TUNE_Z196
338 bool "IBM zEnterprise 114 and 196"
340 config TUNE_ZEC12
341 bool "IBM zBC12 and zEC12"
343 config TUNE_Z13
344 bool "IBM z13"
346 endchoice
348 config 64BIT
349 def_bool y
351 config COMPAT
352 def_bool y
353 prompt "Kernel support for 31 bit emulation"
354 select COMPAT_BINFMT_ELF if BINFMT_ELF
355 select ARCH_WANT_OLD_COMPAT_IPC
356 select COMPAT_OLD_SIGACTION
357 depends on MULTIUSER
358 help
359 Select this option if you want to enable your system kernel to
360 handle system-calls from ELF binaries for 31 bit ESA. This option
361 (and some other stuff like libraries and such) is needed for
362 executing 31 bit applications. It is safe to say "Y".
364 config SYSVIPC_COMPAT
365 def_bool y if COMPAT && SYSVIPC
367 config SMP
368 def_bool y
369 prompt "Symmetric multi-processing support"
370 ---help---
371 This enables support for systems with more than one CPU. If you have
372 a system with only one CPU, like most personal computers, say N. If
373 you have a system with more than one CPU, say Y.
375 If you say N here, the kernel will run on uni- and multiprocessor
376 machines, but will use only one CPU of a multiprocessor machine. If
377 you say Y here, the kernel will run on many, but not all,
378 uniprocessor machines. On a uniprocessor machine, the kernel
379 will run faster if you say N here.
381 See also the SMP-HOWTO available at
382 <http://www.tldp.org/docs.html#howto>.
384 Even if you don't know what to do here, say Y.
386 config NR_CPUS
387 int "Maximum number of CPUs (2-512)"
388 range 2 512
389 depends on SMP
390 default "64"
391 help
392 This allows you to specify the maximum number of CPUs which this
393 kernel will support. The maximum supported value is 512 and the
394 minimum value which makes sense is 2.
396 This is purely to save memory - each supported CPU adds
397 approximately sixteen kilobytes to the kernel image.
399 config HOTPLUG_CPU
400 def_bool y
401 prompt "Support for hot-pluggable CPUs"
402 depends on SMP
403 help
404 Say Y here to be able to turn CPUs off and on. CPUs
405 can be controlled through /sys/devices/system/cpu/cpu#.
406 Say N if you want to disable CPU hotplug.
408 # Some NUMA nodes have memory ranges that span
409 # other nodes. Even though a pfn is valid and
410 # between a node's start and end pfns, it may not
411 # reside on that node. See memmap_init_zone()
412 # for details. <- They meant memory holes!
413 config NODES_SPAN_OTHER_NODES
414 def_bool NUMA
416 config NUMA
417 bool "NUMA support"
418 depends on SMP && SCHED_TOPOLOGY
419 default n
420 help
421 Enable NUMA support
423 This option adds NUMA support to the kernel.
425 An operation mode can be selected by appending
426 numa=<method> to the kernel command line.
428 The default behaviour is identical to appending numa=plain to
429 the command line. This will create just one node with all
430 available memory and all CPUs in it.
432 config NODES_SHIFT
433 int "Maximum NUMA nodes (as a power of 2)"
434 range 1 10
435 depends on NUMA
436 default "4"
437 help
438 Specify the maximum number of NUMA nodes available on the target
439 system. Increases memory reserved to accommodate various tables.
441 menu "Select NUMA modes"
442 depends on NUMA
444 config NUMA_EMU
445 bool "NUMA emulation"
446 default y
447 help
448 Numa emulation mode will split the available system memory into
449 equal chunks which then are distributed over the configured number
450 of nodes in a round-robin manner.
452 The number of fake nodes is limited by the number of available memory
453 chunks (i.e. memory size / fake size) and the number of supported
454 nodes in the kernel.
456 The CPUs are assigned to the nodes in a way that partially respects
457 the original machine topology (if supported by the machine).
458 Fair distribution of the CPUs is not guaranteed.
460 config EMU_SIZE
461 hex "NUMA emulation memory chunk size"
462 default 0x10000000
463 range 0x400000 0x100000000
464 depends on NUMA_EMU
465 help
466 Select the default size by which the memory is chopped and then
467 assigned to emulated NUMA nodes.
469 This can be overridden by specifying
471 emu_size=<n>
473 on the kernel command line where also suffixes K, M, G, and T are
474 supported.
476 endmenu
478 config SCHED_SMT
479 def_bool n
481 config SCHED_MC
482 def_bool n
484 config SCHED_BOOK
485 def_bool n
487 config SCHED_DRAWER
488 def_bool n
490 config SCHED_TOPOLOGY
491 def_bool y
492 prompt "Topology scheduler support"
493 depends on SMP
494 select SCHED_SMT
495 select SCHED_MC
496 select SCHED_BOOK
497 select SCHED_DRAWER
498 help
499 Topology scheduler support improves the CPU scheduler's decision
500 making when dealing with machines that have multi-threading,
501 multiple cores or multiple books.
503 source kernel/Kconfig.preempt
505 source kernel/Kconfig.hz
507 config ARCH_RANDOM
508 def_bool y
509 prompt "s390 architectural random number generation API"
510 help
511 Enable the s390 architectural random number generation API
512 to provide random data for all consumers within the Linux
513 kernel.
515 When enabled the arch_random_* functions declared in linux/random.h
516 are implemented. The implementation is based on the s390 CPACF
517 instruction subfunction TRNG which provides a real true random
518 number generator.
520 If unsure, say Y.
522 endmenu
524 menu "Memory setup"
526 config ARCH_SPARSEMEM_ENABLE
527 def_bool y
528 select SPARSEMEM_VMEMMAP_ENABLE
529 select SPARSEMEM_VMEMMAP
531 config ARCH_SPARSEMEM_DEFAULT
532 def_bool y
534 config ARCH_SELECT_MEMORY_MODEL
535 def_bool y
537 config ARCH_ENABLE_MEMORY_HOTPLUG
538 def_bool y if SPARSEMEM
540 config ARCH_ENABLE_MEMORY_HOTREMOVE
541 def_bool y
543 config ARCH_ENABLE_SPLIT_PMD_PTLOCK
544 def_bool y
546 config FORCE_MAX_ZONEORDER
547 int
548 default "9"
550 source "mm/Kconfig"
552 config MAX_PHYSMEM_BITS
553 int "Maximum size of supported physical memory in bits (42-53)"
554 range 42 53
555 default "46"
556 help
557 This option specifies the maximum supported size of physical memory
558 in bits. Supported is any size between 2^42 (4TB) and 2^53 (8PB).
559 Increasing the number of bits also increases the kernel image size.
560 By default 46 bits (64TB) are supported.
562 config PACK_STACK
563 def_bool y
564 prompt "Pack kernel stack"
565 help
566 This option enables the compiler option -mkernel-backchain if it
567 is available. If the option is available the compiler supports
568 the new stack layout which dramatically reduces the minimum stack
569 frame size. With an old compiler a non-leaf function needs a
570 minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
571 -mkernel-backchain the minimum size drops to 16 byte on 31 bit
572 and 24 byte on 64 bit.
574 Say Y if you are unsure.
576 config CHECK_STACK
577 def_bool y
578 prompt "Detect kernel stack overflow"
579 help
580 This option enables the compiler option -mstack-guard and
581 -mstack-size if they are available. If the compiler supports them
582 it will emit additional code to each function prolog to trigger
583 an illegal operation if the kernel stack is about to overflow.
585 Say N if you are unsure.
587 config STACK_GUARD
588 int "Size of the guard area (128-1024)"
589 range 128 1024
590 depends on CHECK_STACK
591 default "256"
592 help
593 This allows you to specify the size of the guard area at the lower
594 end of the kernel stack. If the kernel stack points into the guard
595 area on function entry an illegal operation is triggered. The size
596 needs to be a power of 2. Please keep in mind that the size of an
597 interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
598 The minimum size for the stack guard should be 256 for 31 bit and
599 512 for 64 bit.
601 config WARN_DYNAMIC_STACK
602 def_bool n
603 prompt "Emit compiler warnings for function with dynamic stack usage"
604 help
605 This option enables the compiler option -mwarn-dynamicstack. If the
606 compiler supports this options generates warnings for functions
607 that dynamically allocate stack space using alloca.
609 Say N if you are unsure.
611 endmenu
613 menu "I/O subsystem"
615 config QDIO
616 def_tristate y
617 prompt "QDIO support"
618 ---help---
619 This driver provides the Queued Direct I/O base support for
620 IBM System z.
622 To compile this driver as a module, choose M here: the
623 module will be called qdio.
625 If unsure, say Y.
627 menuconfig PCI
628 bool "PCI support"
629 select PCI_MSI
630 select IOMMU_SUPPORT
631 help
632 Enable PCI support.
634 if PCI
636 config PCI_NR_FUNCTIONS
637 int "Maximum number of PCI functions (1-4096)"
638 range 1 4096
639 default "128"
640 help
641 This allows you to specify the maximum number of PCI functions which
642 this kernel will support.
644 source "drivers/pci/Kconfig"
646 endif # PCI
648 config PCI_DOMAINS
649 def_bool PCI
651 config HAS_IOMEM
652 def_bool PCI
654 config IOMMU_HELPER
655 def_bool PCI
657 config NEED_SG_DMA_LENGTH
658 def_bool PCI
660 config NEED_DMA_MAP_STATE
661 def_bool PCI
663 config CHSC_SCH
664 def_tristate m
665 prompt "Support for CHSC subchannels"
666 help
667 This driver allows usage of CHSC subchannels. A CHSC subchannel
668 is usually present on LPAR only.
669 The driver creates a device /dev/chsc, which may be used to
670 obtain I/O configuration information about the machine and
671 to issue asynchronous chsc commands (DANGEROUS).
672 You will usually only want to use this interface on a special
673 LPAR designated for system management.
675 To compile this driver as a module, choose M here: the
676 module will be called chsc_sch.
678 If unsure, say N.
680 config SCM_BUS
681 def_bool y
682 prompt "SCM bus driver"
683 help
684 Bus driver for Storage Class Memory.
686 config EADM_SCH
687 def_tristate m
688 prompt "Support for EADM subchannels"
689 depends on SCM_BUS
690 help
691 This driver allows usage of EADM subchannels. EADM subchannels act
692 as a communication vehicle for SCM increments.
694 To compile this driver as a module, choose M here: the
695 module will be called eadm_sch.
697 config VFIO_CCW
698 def_tristate n
699 prompt "Support for VFIO-CCW subchannels"
700 depends on S390_CCW_IOMMU && VFIO_MDEV
701 help
702 This driver allows usage of I/O subchannels via VFIO-CCW.
704 To compile this driver as a module, choose M here: the
705 module will be called vfio_ccw.
707 endmenu
709 menu "Dump support"
711 config CRASH_DUMP
712 bool "kernel crash dumps"
713 depends on SMP
714 select KEXEC
715 help
716 Generate crash dump after being started by kexec.
717 Crash dump kernels are loaded in the main kernel with kexec-tools
718 into a specially reserved region and then later executed after
719 a crash by kdump/kexec.
720 Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this.
721 This option also enables s390 zfcpdump.
722 See also <file:Documentation/s390/zfcpdump.txt>
724 endmenu
726 menu "Executable file formats / Emulations"
728 source "fs/Kconfig.binfmt"
730 config SECCOMP
731 def_bool y
732 prompt "Enable seccomp to safely compute untrusted bytecode"
733 depends on PROC_FS
734 help
735 This kernel feature is useful for number crunching applications
736 that may need to compute untrusted bytecode during their
737 execution. By using pipes or other transports made available to
738 the process as file descriptors supporting the read/write
739 syscalls, it's possible to isolate those applications in
740 their own address space using seccomp. Once seccomp is
741 enabled via /proc/<pid>/seccomp, it cannot be disabled
742 and the task is only allowed to execute a few safe syscalls
743 defined by each seccomp mode.
745 If unsure, say Y.
747 endmenu
749 menu "Power Management"
751 config ARCH_HIBERNATION_POSSIBLE
752 def_bool y
754 source "kernel/power/Kconfig"
756 endmenu
758 source "net/Kconfig"
760 config PCMCIA
761 def_bool n
763 config CCW
764 def_bool y
766 source "drivers/Kconfig"
768 source "fs/Kconfig"
770 source "arch/s390/Kconfig.debug"
772 source "security/Kconfig"
774 source "crypto/Kconfig"
776 source "lib/Kconfig"
778 menu "Virtualization"
780 config PFAULT
781 def_bool y
782 prompt "Pseudo page fault support"
783 help
784 Select this option, if you want to use PFAULT pseudo page fault
785 handling under VM. If running native or in LPAR, this option
786 has no effect. If your VM does not support PFAULT, PAGEEX
787 pseudo page fault handling will be used.
788 Note that VM 4.2 supports PFAULT but has a bug in its
789 implementation that causes some problems.
790 Everybody who wants to run Linux under VM != VM4.2 should select
791 this option.
793 config SHARED_KERNEL
794 bool "VM shared kernel support"
795 depends on !JUMP_LABEL
796 help
797 Select this option, if you want to share the text segment of the
798 Linux kernel between different VM guests. This reduces memory
799 usage with lots of guests but greatly increases kernel size.
800 Also if a kernel was IPL'ed from a shared segment the kexec system
801 call will not work.
802 You should only select this option if you know what you are
803 doing and want to exploit this feature.
805 config CMM
806 def_tristate n
807 prompt "Cooperative memory management"
808 help
809 Select this option, if you want to enable the kernel interface
810 to reduce the memory size of the system. This is accomplished
811 by allocating pages of memory and put them "on hold". This only
812 makes sense for a system running under VM where the unused pages
813 will be reused by VM for other guest systems. The interface
814 allows an external monitor to balance memory of many systems.
815 Everybody who wants to run Linux under VM should select this
816 option.
818 config CMM_IUCV
819 def_bool y
820 prompt "IUCV special message interface to cooperative memory management"
821 depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
822 help
823 Select this option to enable the special message interface to
824 the cooperative memory management.
826 config APPLDATA_BASE
827 def_bool n
828 prompt "Linux - VM Monitor Stream, base infrastructure"
829 depends on PROC_FS
830 help
831 This provides a kernel interface for creating and updating z/VM APPLDATA
832 monitor records. The monitor records are updated at certain time
833 intervals, once the timer is started.
834 Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
835 i.e. enables or disables monitoring on the Linux side.
836 A custom interval value (in seconds) can be written to
837 /proc/appldata/interval.
839 Defaults are 60 seconds interval and timer off.
840 The /proc entries can also be read from, showing the current settings.
842 config APPLDATA_MEM
843 def_tristate m
844 prompt "Monitor memory management statistics"
845 depends on APPLDATA_BASE && VM_EVENT_COUNTERS
846 help
847 This provides memory management related data to the Linux - VM Monitor
848 Stream, like paging/swapping rate, memory utilisation, etc.
849 Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
850 APPLDATA monitor record, i.e. enables or disables monitoring this record
851 on the z/VM side.
853 Default is disabled.
854 The /proc entry can also be read from, showing the current settings.
856 This can also be compiled as a module, which will be called
857 appldata_mem.o.
859 config APPLDATA_OS
860 def_tristate m
861 prompt "Monitor OS statistics"
862 depends on APPLDATA_BASE
863 help
864 This provides OS related data to the Linux - VM Monitor Stream, like
865 CPU utilisation, etc.
866 Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
867 APPLDATA monitor record, i.e. enables or disables monitoring this record
868 on the z/VM side.
870 Default is disabled.
871 This can also be compiled as a module, which will be called
872 appldata_os.o.
874 config APPLDATA_NET_SUM
875 def_tristate m
876 prompt "Monitor overall network statistics"
877 depends on APPLDATA_BASE && NET
878 help
879 This provides network related data to the Linux - VM Monitor Stream,
880 currently there is only a total sum of network I/O statistics, no
881 per-interface data.
882 Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
883 APPLDATA monitor record, i.e. enables or disables monitoring this record
884 on the z/VM side.
886 Default is disabled.
887 This can also be compiled as a module, which will be called
888 appldata_net_sum.o.
890 config S390_HYPFS_FS
891 def_bool y
892 prompt "s390 hypervisor file system support"
893 select SYS_HYPERVISOR
894 help
895 This is a virtual file system intended to provide accounting
896 information in an s390 hypervisor environment.
898 source "arch/s390/kvm/Kconfig"
900 config S390_GUEST
901 def_bool y
902 prompt "s390 support for virtio devices"
903 select TTY
904 select VIRTUALIZATION
905 select VIRTIO
906 select VIRTIO_CONSOLE
907 help
908 Enabling this option adds support for virtio based paravirtual device
909 drivers on s390.
911 Select this option if you want to run the kernel as a guest under
912 the KVM hypervisor.
914 config S390_GUEST_OLD_TRANSPORT
915 def_bool y
916 prompt "Guest support for old s390 virtio transport (DEPRECATED)"
917 depends on S390_GUEST
918 help
919 Enable this option to add support for the old s390-virtio
920 transport (i.e. virtio devices NOT based on virtio-ccw). This
921 type of virtio devices is only available on the experimental
922 kuli userspace or with old (< 2.6) qemu. If you are running
923 with a modern version of qemu (which supports virtio-ccw since
924 1.4 and uses it by default since version 2.4), you probably won't
925 need this.
927 endmenu