1config MMU
2 def_bool y
3
4config ZONE_DMA
5 def_bool y
6
7config CPU_BIG_ENDIAN
8 def_bool y
9
10config LOCKDEP_SUPPORT
11 def_bool y
12
13config STACKTRACE_SUPPORT
14 def_bool y
15
16config RWSEM_GENERIC_SPINLOCK
17 bool
18
19config RWSEM_XCHGADD_ALGORITHM
20 def_bool y
21
22config ARCH_HAS_ILOG2_U32
23 def_bool n
24
25config ARCH_HAS_ILOG2_U64
26 def_bool n
27
28config GENERIC_HWEIGHT
29 def_bool y
30
31config GENERIC_BUG
32 def_bool y if BUG
33
34config GENERIC_BUG_RELATIVE_POINTERS
35 def_bool y
36
37config ARCH_DMA_ADDR_T_64BIT
38 def_bool y
39
40config GENERIC_LOCKBREAK
41 def_bool y if SMP && PREEMPT
42
43config PGSTE
44 def_bool y if KVM
45
46config ARCH_SUPPORTS_DEBUG_PAGEALLOC
47 def_bool y
48
49config KEXEC
50 def_bool y
51 select KEXEC_CORE
52
53config AUDIT_ARCH
54 def_bool y
55
56config NO_IOPORT_MAP
57 def_bool y
58
59config PCI_QUIRKS
60 def_bool n
61
62config ARCH_SUPPORTS_UPROBES
63 def_bool y
64
65config S390
66 def_bool y
67 select ARCH_HAS_DEVMEM_IS_ALLOWED
68 select ARCH_HAS_ELF_RANDOMIZE
69 select ARCH_HAS_GCOV_PROFILE_ALL
70 select ARCH_HAS_GIGANTIC_PAGE
71 select ARCH_HAS_KCOV
72 select ARCH_HAS_SET_MEMORY
73 select ARCH_HAS_SG_CHAIN
74 select ARCH_HAS_STRICT_KERNEL_RWX
75 select ARCH_HAS_STRICT_MODULE_RWX
76 select ARCH_HAS_UBSAN_SANITIZE_ALL
77 select ARCH_HAVE_NMI_SAFE_CMPXCHG
78 select ARCH_INLINE_READ_LOCK
79 select ARCH_INLINE_READ_LOCK_BH
80 select ARCH_INLINE_READ_LOCK_IRQ
81 select ARCH_INLINE_READ_LOCK_IRQSAVE
82 select ARCH_INLINE_READ_TRYLOCK
83 select ARCH_INLINE_READ_UNLOCK
84 select ARCH_INLINE_READ_UNLOCK_BH
85 select ARCH_INLINE_READ_UNLOCK_IRQ
86 select ARCH_INLINE_READ_UNLOCK_IRQRESTORE
87 select ARCH_INLINE_SPIN_LOCK
88 select ARCH_INLINE_SPIN_LOCK_BH
89 select ARCH_INLINE_SPIN_LOCK_IRQ
90 select ARCH_INLINE_SPIN_LOCK_IRQSAVE
91 select ARCH_INLINE_SPIN_TRYLOCK
92 select ARCH_INLINE_SPIN_TRYLOCK_BH
93 select ARCH_INLINE_SPIN_UNLOCK
94 select ARCH_INLINE_SPIN_UNLOCK_BH
95 select ARCH_INLINE_SPIN_UNLOCK_IRQ
96 select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE
97 select ARCH_INLINE_WRITE_LOCK
98 select ARCH_INLINE_WRITE_LOCK_BH
99 select ARCH_INLINE_WRITE_LOCK_IRQ
100 select ARCH_INLINE_WRITE_LOCK_IRQSAVE
101 select ARCH_INLINE_WRITE_TRYLOCK
102 select ARCH_INLINE_WRITE_UNLOCK
103 select ARCH_INLINE_WRITE_UNLOCK_BH
104 select ARCH_INLINE_WRITE_UNLOCK_IRQ
105 select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE
106 select ARCH_SAVE_PAGE_KEYS if HIBERNATION
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_WANTS_PROT_NUMA_PROT_NONE
113 select ARCH_WANTS_UBSAN_NO_NULL
114 select ARCH_WANT_IPC_PARSE_VERSION
115 select BUILDTIME_EXTABLE_SORT
116 select CLONE_BACKWARDS2
117 select DYNAMIC_FTRACE if FUNCTION_TRACER
118 select GENERIC_CLOCKEVENTS
119 select GENERIC_CPU_AUTOPROBE
120 select GENERIC_CPU_DEVICES if !SMP
121 select GENERIC_FIND_FIRST_BIT
122 select GENERIC_SMP_IDLE_THREAD
123 select GENERIC_TIME_VSYSCALL
124 select HAVE_ALIGNED_STRUCT_PAGE if SLUB
125 select HAVE_ARCH_AUDITSYSCALL
126 select HAVE_ARCH_EARLY_PFN_TO_NID
127 select HAVE_ARCH_HARDENED_USERCOPY
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
181
182
183config SCHED_OMIT_FRAME_POINTER
184 def_bool y
185
186config PGTABLE_LEVELS
187 int
188 default 4
189
190source "init/Kconfig"
191
192source "kernel/Kconfig.freezer"
193
194source "kernel/livepatch/Kconfig"
195
196menu "Processor type and features"
197
198config HAVE_MARCH_Z900_FEATURES
199 def_bool n
200
201config HAVE_MARCH_Z990_FEATURES
202 def_bool n
203 select HAVE_MARCH_Z900_FEATURES
204
205config HAVE_MARCH_Z9_109_FEATURES
206 def_bool n
207 select HAVE_MARCH_Z990_FEATURES
208
209config HAVE_MARCH_Z10_FEATURES
210 def_bool n
211 select HAVE_MARCH_Z9_109_FEATURES
212
213config HAVE_MARCH_Z196_FEATURES
214 def_bool n
215 select HAVE_MARCH_Z10_FEATURES
216
217config HAVE_MARCH_ZEC12_FEATURES
218 def_bool n
219 select HAVE_MARCH_Z196_FEATURES
220
221config HAVE_MARCH_Z13_FEATURES
222 def_bool n
223 select HAVE_MARCH_ZEC12_FEATURES
224
225choice
226 prompt "Processor type"
227 default MARCH_Z196
228
229config 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.
236
237config 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.
244
245config 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.
252
253config 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.
260
261config 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.
268
269config 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.
276
277config 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.
284
285endchoice
286
287config MARCH_Z900_TUNE
288 def_bool TUNE_Z900 || MARCH_Z900 && TUNE_DEFAULT
289
290config MARCH_Z990_TUNE
291 def_bool TUNE_Z990 || MARCH_Z990 && TUNE_DEFAULT
292
293config MARCH_Z9_109_TUNE
294 def_bool TUNE_Z9_109 || MARCH_Z9_109 && TUNE_DEFAULT
295
296config MARCH_Z10_TUNE
297 def_bool TUNE_Z10 || MARCH_Z10 && TUNE_DEFAULT
298
299config MARCH_Z196_TUNE
300 def_bool TUNE_Z196 || MARCH_Z196 && TUNE_DEFAULT
301
302config MARCH_ZEC12_TUNE
303 def_bool TUNE_ZEC12 || MARCH_ZEC12 && TUNE_DEFAULT
304
305config MARCH_Z13_TUNE
306 def_bool TUNE_Z13 || MARCH_Z13 && TUNE_DEFAULT
307
308choice
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.
318
319config TUNE_DEFAULT
320 bool "Default"
321 help
322 Tune the generated code for the target processor for which the kernel
323 will be compiled.
324
325config TUNE_Z900
326 bool "IBM zSeries model z800 and z900"
327
328config TUNE_Z990
329 bool "IBM zSeries model z890 and z990"
330
331config TUNE_Z9_109
332 bool "IBM System z9"
333
334config TUNE_Z10
335 bool "IBM System z10"
336
337config TUNE_Z196
338 bool "IBM zEnterprise 114 and 196"
339
340config TUNE_ZEC12
341 bool "IBM zBC12 and zEC12"
342
343config TUNE_Z13
344 bool "IBM z13"
345
346endchoice
347
348config 64BIT
349 def_bool y
350
351config 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".
363
364config SYSVIPC_COMPAT
365 def_bool y if COMPAT && SYSVIPC
366
367config KEYS_COMPAT
368 def_bool y if COMPAT && KEYS
369
370config SMP
371 def_bool y
372 prompt "Symmetric multi-processing support"
373 ---help---
374 This enables support for systems with more than one CPU. If you have
375 a system with only one CPU, like most personal computers, say N. If
376 you have a system with more than one CPU, say Y.
377
378 If you say N here, the kernel will run on uni- and multiprocessor
379 machines, but will use only one CPU of a multiprocessor machine. If
380 you say Y here, the kernel will run on many, but not all,
381 uniprocessor machines. On a uniprocessor machine, the kernel
382 will run faster if you say N here.
383
384 See also the SMP-HOWTO available at
385 <http://www.tldp.org/docs.html
386
387 Even if you don't know what to do here, say Y.
388
389config NR_CPUS
390 int "Maximum number of CPUs (2-512)"
391 range 2 512
392 depends on SMP
393 default "64"
394 help
395 This allows you to specify the maximum number of CPUs which this
396 kernel will support. The maximum supported value is 512 and the
397 minimum value which makes sense is 2.
398
399 This is purely to save memory - each supported CPU adds
400 approximately sixteen kilobytes to the kernel image.
401
402config HOTPLUG_CPU
403 def_bool y
404 prompt "Support for hot-pluggable CPUs"
405 depends on SMP
406 help
407 Say Y here to be able to turn CPUs off and on. CPUs
408 can be controlled through /sys/devices/system/cpu/cpu#.
409 Say N if you want to disable CPU hotplug.
410
411
412
413
414
415
416config NODES_SPAN_OTHER_NODES
417 def_bool NUMA
418
419config NUMA
420 bool "NUMA support"
421 depends on SMP && SCHED_TOPOLOGY
422 default n
423 help
424 Enable NUMA support
425
426 This option adds NUMA support to the kernel.
427
428 An operation mode can be selected by appending
429 numa=<method> to the kernel command line.
430
431 The default behaviour is identical to appending numa=plain to
432 the command line. This will create just one node with all
433 available memory and all CPUs in it.
434
435config NODES_SHIFT
436 int "Maximum NUMA nodes (as a power of 2)"
437 range 1 10
438 depends on NUMA
439 default "4"
440 help
441 Specify the maximum number of NUMA nodes available on the target
442 system. Increases memory reserved to accommodate various tables.
443
444menu "Select NUMA modes"
445 depends on NUMA
446
447config NUMA_EMU
448 bool "NUMA emulation"
449 default y
450 help
451 Numa emulation mode will split the available system memory into
452 equal chunks which then are distributed over the configured number
453 of nodes in a round-robin manner.
454
455 The number of fake nodes is limited by the number of available memory
456 chunks (i.e. memory size / fake size) and the number of supported
457 nodes in the kernel.
458
459 The CPUs are assigned to the nodes in a way that partially respects
460 the original machine topology (if supported by the machine).
461 Fair distribution of the CPUs is not guaranteed.
462
463config EMU_SIZE
464 hex "NUMA emulation memory chunk size"
465 default 0x10000000
466 range 0x400000 0x100000000
467 depends on NUMA_EMU
468 help
469 Select the default size by which the memory is chopped and then
470 assigned to emulated NUMA nodes.
471
472 This can be overridden by specifying
473
474 emu_size=<n>
475
476 on the kernel command line where also suffixes K, M, G, and T are
477 supported.
478
479endmenu
480
481config SCHED_SMT
482 def_bool n
483
484config SCHED_MC
485 def_bool n
486
487config SCHED_BOOK
488 def_bool n
489
490config SCHED_DRAWER
491 def_bool n
492
493config SCHED_TOPOLOGY
494 def_bool y
495 prompt "Topology scheduler support"
496 depends on SMP
497 select SCHED_SMT
498 select SCHED_MC
499 select SCHED_BOOK
500 select SCHED_DRAWER
501 help
502 Topology scheduler support improves the CPU scheduler's decision
503 making when dealing with machines that have multi-threading,
504 multiple cores or multiple books.
505
506source kernel/Kconfig.preempt
507
508source kernel/Kconfig.hz
509
510endmenu
511
512menu "Memory setup"
513
514config ARCH_SPARSEMEM_ENABLE
515 def_bool y
516 select SPARSEMEM_VMEMMAP_ENABLE
517 select SPARSEMEM_VMEMMAP
518
519config ARCH_SPARSEMEM_DEFAULT
520 def_bool y
521
522config ARCH_SELECT_MEMORY_MODEL
523 def_bool y
524
525config ARCH_ENABLE_MEMORY_HOTPLUG
526 def_bool y if SPARSEMEM
527
528config ARCH_ENABLE_MEMORY_HOTREMOVE
529 def_bool y
530
531config ARCH_ENABLE_SPLIT_PMD_PTLOCK
532 def_bool y
533
534config FORCE_MAX_ZONEORDER
535 int
536 default "9"
537
538source "mm/Kconfig"
539
540config PACK_STACK
541 def_bool y
542 prompt "Pack kernel stack"
543 help
544 This option enables the compiler option -mkernel-backchain if it
545 is available. If the option is available the compiler supports
546 the new stack layout which dramatically reduces the minimum stack
547 frame size. With an old compiler a non-leaf function needs a
548 minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
549 -mkernel-backchain the minimum size drops to 16 byte on 31 bit
550 and 24 byte on 64 bit.
551
552 Say Y if you are unsure.
553
554config CHECK_STACK
555 def_bool y
556 prompt "Detect kernel stack overflow"
557 help
558 This option enables the compiler option -mstack-guard and
559 -mstack-size if they are available. If the compiler supports them
560 it will emit additional code to each function prolog to trigger
561 an illegal operation if the kernel stack is about to overflow.
562
563 Say N if you are unsure.
564
565config STACK_GUARD
566 int "Size of the guard area (128-1024)"
567 range 128 1024
568 depends on CHECK_STACK
569 default "256"
570 help
571 This allows you to specify the size of the guard area at the lower
572 end of the kernel stack. If the kernel stack points into the guard
573 area on function entry an illegal operation is triggered. The size
574 needs to be a power of 2. Please keep in mind that the size of an
575 interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
576 The minimum size for the stack guard should be 256 for 31 bit and
577 512 for 64 bit.
578
579config WARN_DYNAMIC_STACK
580 def_bool n
581 prompt "Emit compiler warnings for function with dynamic stack usage"
582 help
583 This option enables the compiler option -mwarn-dynamicstack. If the
584 compiler supports this options generates warnings for functions
585 that dynamically allocate stack space using alloca.
586
587 Say N if you are unsure.
588
589endmenu
590
591menu "I/O subsystem"
592
593config QDIO
594 def_tristate y
595 prompt "QDIO support"
596 ---help---
597 This driver provides the Queued Direct I/O base support for
598 IBM System z.
599
600 To compile this driver as a module, choose M here: the
601 module will be called qdio.
602
603 If unsure, say Y.
604
605menuconfig PCI
606 bool "PCI support"
607 select PCI_MSI
608 select IOMMU_SUPPORT
609 help
610 Enable PCI support.
611
612if PCI
613
614config PCI_NR_FUNCTIONS
615 int "Maximum number of PCI functions (1-4096)"
616 range 1 4096
617 default "64"
618 help
619 This allows you to specify the maximum number of PCI functions which
620 this kernel will support.
621
622source "drivers/pci/Kconfig"
623
624endif
625
626config PCI_DOMAINS
627 def_bool PCI
628
629config HAS_IOMEM
630 def_bool PCI
631
632config IOMMU_HELPER
633 def_bool PCI
634
635config NEED_SG_DMA_LENGTH
636 def_bool PCI
637
638config NEED_DMA_MAP_STATE
639 def_bool PCI
640
641config CHSC_SCH
642 def_tristate m
643 prompt "Support for CHSC subchannels"
644 help
645 This driver allows usage of CHSC subchannels. A CHSC subchannel
646 is usually present on LPAR only.
647 The driver creates a device /dev/chsc, which may be used to
648 obtain I/O configuration information about the machine and
649 to issue asynchronous chsc commands (DANGEROUS).
650 You will usually only want to use this interface on a special
651 LPAR designated for system management.
652
653 To compile this driver as a module, choose M here: the
654 module will be called chsc_sch.
655
656 If unsure, say N.
657
658config SCM_BUS
659 def_bool y
660 prompt "SCM bus driver"
661 help
662 Bus driver for Storage Class Memory.
663
664config EADM_SCH
665 def_tristate m
666 prompt "Support for EADM subchannels"
667 depends on SCM_BUS
668 help
669 This driver allows usage of EADM subchannels. EADM subchannels act
670 as a communication vehicle for SCM increments.
671
672 To compile this driver as a module, choose M here: the
673 module will be called eadm_sch.
674
675endmenu
676
677menu "Dump support"
678
679config CRASH_DUMP
680 bool "kernel crash dumps"
681 depends on SMP
682 select KEXEC
683 help
684 Generate crash dump after being started by kexec.
685 Crash dump kernels are loaded in the main kernel with kexec-tools
686 into a specially reserved region and then later executed after
687 a crash by kdump/kexec.
688 Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this.
689 This option also enables s390 zfcpdump.
690 See also <file:Documentation/s390/zfcpdump.txt>
691
692endmenu
693
694menu "Executable file formats / Emulations"
695
696source "fs/Kconfig.binfmt"
697
698config SECCOMP
699 def_bool y
700 prompt "Enable seccomp to safely compute untrusted bytecode"
701 depends on PROC_FS
702 help
703 This kernel feature is useful for number crunching applications
704 that may need to compute untrusted bytecode during their
705 execution. By using pipes or other transports made available to
706 the process as file descriptors supporting the read/write
707 syscalls, it's possible to isolate those applications in
708 their own address space using seccomp. Once seccomp is
709 enabled via /proc/<pid>/seccomp, it cannot be disabled
710 and the task is only allowed to execute a few safe syscalls
711 defined by each seccomp mode.
712
713 If unsure, say Y.
714
715endmenu
716
717menu "Power Management"
718
719config ARCH_HIBERNATION_POSSIBLE
720 def_bool y
721
722source "kernel/power/Kconfig"
723
724endmenu
725
726source "net/Kconfig"
727
728config PCMCIA
729 def_bool n
730
731config CCW
732 def_bool y
733
734source "drivers/Kconfig"
735
736source "fs/Kconfig"
737
738source "arch/s390/Kconfig.debug"
739
740source "security/Kconfig"
741
742source "crypto/Kconfig"
743
744source "lib/Kconfig"
745
746menu "Virtualization"
747
748config PFAULT
749 def_bool y
750 prompt "Pseudo page fault support"
751 help
752 Select this option, if you want to use PFAULT pseudo page fault
753 handling under VM. If running native or in LPAR, this option
754 has no effect. If your VM does not support PFAULT, PAGEEX
755 pseudo page fault handling will be used.
756 Note that VM 4.2 supports PFAULT but has a bug in its
757 implementation that causes some problems.
758 Everybody who wants to run Linux under VM != VM4.2 should select
759 this option.
760
761config SHARED_KERNEL
762 bool "VM shared kernel support"
763 depends on !JUMP_LABEL
764 help
765 Select this option, if you want to share the text segment of the
766 Linux kernel between different VM guests. This reduces memory
767 usage with lots of guests but greatly increases kernel size.
768 Also if a kernel was IPL'ed from a shared segment the kexec system
769 call will not work.
770 You should only select this option if you know what you are
771 doing and want to exploit this feature.
772
773config CMM
774 def_tristate n
775 prompt "Cooperative memory management"
776 help
777 Select this option, if you want to enable the kernel interface
778 to reduce the memory size of the system. This is accomplished
779 by allocating pages of memory and put them "on hold". This only
780 makes sense for a system running under VM where the unused pages
781 will be reused by VM for other guest systems. The interface
782 allows an external monitor to balance memory of many systems.
783 Everybody who wants to run Linux under VM should select this
784 option.
785
786config CMM_IUCV
787 def_bool y
788 prompt "IUCV special message interface to cooperative memory management"
789 depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
790 help
791 Select this option to enable the special message interface to
792 the cooperative memory management.
793
794config APPLDATA_BASE
795 def_bool n
796 prompt "Linux - VM Monitor Stream, base infrastructure"
797 depends on PROC_FS
798 help
799 This provides a kernel interface for creating and updating z/VM APPLDATA
800 monitor records. The monitor records are updated at certain time
801 intervals, once the timer is started.
802 Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
803 i.e. enables or disables monitoring on the Linux side.
804 A custom interval value (in seconds) can be written to
805 /proc/appldata/interval.
806
807 Defaults are 60 seconds interval and timer off.
808 The /proc entries can also be read from, showing the current settings.
809
810config APPLDATA_MEM
811 def_tristate m
812 prompt "Monitor memory management statistics"
813 depends on APPLDATA_BASE && VM_EVENT_COUNTERS
814 help
815 This provides memory management related data to the Linux - VM Monitor
816 Stream, like paging/swapping rate, memory utilisation, etc.
817 Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
818 APPLDATA monitor record, i.e. enables or disables monitoring this record
819 on the z/VM side.
820
821 Default is disabled.
822 The /proc entry can also be read from, showing the current settings.
823
824 This can also be compiled as a module, which will be called
825 appldata_mem.o.
826
827config APPLDATA_OS
828 def_tristate m
829 prompt "Monitor OS statistics"
830 depends on APPLDATA_BASE
831 help
832 This provides OS related data to the Linux - VM Monitor Stream, like
833 CPU utilisation, etc.
834 Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
835 APPLDATA monitor record, i.e. enables or disables monitoring this record
836 on the z/VM side.
837
838 Default is disabled.
839 This can also be compiled as a module, which will be called
840 appldata_os.o.
841
842config APPLDATA_NET_SUM
843 def_tristate m
844 prompt "Monitor overall network statistics"
845 depends on APPLDATA_BASE && NET
846 help
847 This provides network related data to the Linux - VM Monitor Stream,
848 currently there is only a total sum of network I/O statistics, no
849 per-interface data.
850 Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
851 APPLDATA monitor record, i.e. enables or disables monitoring this record
852 on the z/VM side.
853
854 Default is disabled.
855 This can also be compiled as a module, which will be called
856 appldata_net_sum.o.
857
858config S390_HYPFS_FS
859 def_bool y
860 prompt "s390 hypervisor file system support"
861 select SYS_HYPERVISOR
862 help
863 This is a virtual file system intended to provide accounting
864 information in an s390 hypervisor environment.
865
866source "arch/s390/kvm/Kconfig"
867
868config S390_GUEST
869 def_bool y
870 prompt "s390 support for virtio devices"
871 select TTY
872 select VIRTUALIZATION
873 select VIRTIO
874 select VIRTIO_CONSOLE
875 help
876 Enabling this option adds support for virtio based paravirtual device
877 drivers on s390.
878
879 Select this option if you want to run the kernel as a guest under
880 the KVM hypervisor.
881
882config S390_GUEST_OLD_TRANSPORT
883 def_bool y
884 prompt "Guest support for old s390 virtio transport (DEPRECATED)"
885 depends on S390_GUEST
886 help
887 Enable this option to add support for the old s390-virtio
888 transport (i.e. virtio devices NOT based on virtio-ccw). This
889 type of virtio devices is only available on the experimental
890 kuli userspace or with old (< 2.6) qemu. If you are running
891 with a modern version of qemu (which supports virtio-ccw since
892 1.4 and uses it by default since version 2.4), you probably won't
893 need this.
894
895endmenu
896
