arch/s390/Kconfig

   1 config MMU
   2         def_bool y
   3
   4 config ZONE_DMA
   5         def_bool y
   6
   7 config LOCKDEP_SUPPORT
   8         def_bool y
   9
  10 config STACKTRACE_SUPPORT
  11         def_bool y
  12
  13 config HAVE_LATENCYTOP_SUPPORT
  14         def_bool y
  15
  16 config RWSEM_GENERIC_SPINLOCK
  17         bool
  18
  19 config RWSEM_XCHGADD_ALGORITHM
  20         def_bool y
  21
  22 config ARCH_HAS_ILOG2_U32
  23         def_bool n
  24
  25 config ARCH_HAS_ILOG2_U64
  26         def_bool n
  27
  28 config GENERIC_HWEIGHT
  29         def_bool y
  30
  31 config GENERIC_BUG
  32         def_bool y if BUG
  33
  34 config GENERIC_BUG_RELATIVE_POINTERS
  35         def_bool y
  36
  37 config ARCH_DMA_ADDR_T_64BIT
  38         def_bool 64BIT
  39
  40 config GENERIC_LOCKBREAK
  41         def_bool y if SMP && PREEMPT
  42
  43 config PGSTE
  44         def_bool y if KVM
  45
  46 config ARCH_SUPPORTS_DEBUG_PAGEALLOC
  47         def_bool y
  48
  49 config KEXEC
  50         def_bool y
  51
  52 config AUDIT_ARCH
  53         def_bool y
  54
  55 config NO_IOPORT
  56         def_bool y
  57
  58 config PCI_QUIRKS
  59         def_bool n
  60
  61 config S390
  62         def_bool y
  63         select ARCH_DISCARD_MEMBLOCK
  64         select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
  65         select ARCH_HAS_DEBUG_STRICT_USER_COPY_CHECKS
  66         select ARCH_HAVE_NMI_SAFE_CMPXCHG
  67         select ARCH_INLINE_READ_LOCK
  68         select ARCH_INLINE_READ_LOCK_BH
  69         select ARCH_INLINE_READ_LOCK_IRQ
  70         select ARCH_INLINE_READ_LOCK_IRQSAVE
  71         select ARCH_INLINE_READ_TRYLOCK
  72         select ARCH_INLINE_READ_UNLOCK
  73         select ARCH_INLINE_READ_UNLOCK_BH
  74         select ARCH_INLINE_READ_UNLOCK_IRQ
  75         select ARCH_INLINE_READ_UNLOCK_IRQRESTORE
  76         select ARCH_INLINE_SPIN_LOCK
  77         select ARCH_INLINE_SPIN_LOCK_BH
  78         select ARCH_INLINE_SPIN_LOCK_IRQ
  79         select ARCH_INLINE_SPIN_LOCK_IRQSAVE
  80         select ARCH_INLINE_SPIN_TRYLOCK
  81         select ARCH_INLINE_SPIN_TRYLOCK_BH
  82         select ARCH_INLINE_SPIN_UNLOCK
  83         select ARCH_INLINE_SPIN_UNLOCK_BH
  84         select ARCH_INLINE_SPIN_UNLOCK_IRQ
  85         select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE
  86         select ARCH_INLINE_WRITE_LOCK
  87         select ARCH_INLINE_WRITE_LOCK_BH
  88         select ARCH_INLINE_WRITE_LOCK_IRQ
  89         select ARCH_INLINE_WRITE_LOCK_IRQSAVE
  90         select ARCH_INLINE_WRITE_TRYLOCK
  91         select ARCH_INLINE_WRITE_UNLOCK
  92         select ARCH_INLINE_WRITE_UNLOCK_BH
  93         select ARCH_INLINE_WRITE_UNLOCK_IRQ
  94         select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE
  95         select ARCH_SAVE_PAGE_KEYS if HIBERNATION
  96         select ARCH_USE_CMPXCHG_LOCKREF
  97         select ARCH_WANT_IPC_PARSE_VERSION
  98         select BUILDTIME_EXTABLE_SORT
  99         select CLONE_BACKWARDS2
 100         select GENERIC_CLOCKEVENTS
 101         select GENERIC_CPU_DEVICES if !SMP
 102         select GENERIC_FIND_FIRST_BIT
 103         select GENERIC_SMP_IDLE_THREAD
 104         select GENERIC_TIME_VSYSCALL_OLD
 105         select HAVE_ALIGNED_STRUCT_PAGE if SLUB
 106         select HAVE_ARCH_JUMP_LABEL if !MARCH_G5
 107         select HAVE_ARCH_SECCOMP_FILTER
 108         select HAVE_ARCH_TRACEHOOK
 109         select HAVE_ARCH_TRANSPARENT_HUGEPAGE if 64BIT
 110         select HAVE_BPF_JIT if 64BIT && PACK_STACK
 111         select HAVE_CMPXCHG_DOUBLE
 112         select HAVE_CMPXCHG_LOCAL
 113         select HAVE_C_RECORDMCOUNT
 114         select HAVE_DEBUG_KMEMLEAK
 115         select HAVE_DYNAMIC_FTRACE
 116         select HAVE_FTRACE_MCOUNT_RECORD
 117         select HAVE_FUNCTION_GRAPH_TRACER
 118         select HAVE_FUNCTION_TRACER
 119         select HAVE_FUNCTION_TRACE_MCOUNT_TEST
 120         select HAVE_KERNEL_BZIP2
 121         select HAVE_KERNEL_GZIP
 122         select HAVE_KERNEL_LZ4
 123         select HAVE_KERNEL_LZMA
 124         select HAVE_KERNEL_LZO
 125         select HAVE_KERNEL_XZ
 126         select HAVE_KPROBES
 127         select HAVE_KRETPROBES
 128         select HAVE_KVM if 64BIT
 129         select HAVE_MEMBLOCK
 130         select HAVE_MEMBLOCK_NODE_MAP
 131         select HAVE_MOD_ARCH_SPECIFIC
 132         select HAVE_OPROFILE
 133         select HAVE_PERF_EVENTS
 134         select HAVE_REGS_AND_STACK_ACCESS_API
 135         select HAVE_SYSCALL_TRACEPOINTS
 136         select HAVE_UID16 if 32BIT
 137         select HAVE_VIRT_CPU_ACCOUNTING
 138         select INIT_ALL_POSSIBLE
 139         select KTIME_SCALAR if 32BIT
 140         select MODULES_USE_ELF_RELA
 141         select OLD_SIGACTION
 142         select OLD_SIGSUSPEND3
 143         select SYSCTL_EXCEPTION_TRACE
 144         select USE_GENERIC_SMP_HELPERS if SMP
 145         select VIRT_CPU_ACCOUNTING
 146         select VIRT_TO_BUS
 147
 148 config SCHED_OMIT_FRAME_POINTER
 149         def_bool y
 150
 151 source "init/Kconfig"
 152
 153 source "kernel/Kconfig.freezer"
 154
 155 menu "Processor type and features"
 156
 157 config HAVE_MARCH_Z900_FEATURES
 158         def_bool n
 159
 160 config HAVE_MARCH_Z990_FEATURES
 161         def_bool n
 162         select HAVE_MARCH_Z900_FEATURES
 163
 164 config HAVE_MARCH_Z9_109_FEATURES
 165         def_bool n
 166         select HAVE_MARCH_Z990_FEATURES
 167
 168 config HAVE_MARCH_Z10_FEATURES
 169         def_bool n
 170         select HAVE_MARCH_Z9_109_FEATURES
 171
 172 config HAVE_MARCH_Z196_FEATURES
 173         def_bool n
 174         select HAVE_MARCH_Z10_FEATURES
 175
 176 config HAVE_MARCH_ZEC12_FEATURES
 177         def_bool n
 178         select HAVE_MARCH_Z196_FEATURES
 179
 180 choice
 181         prompt "Processor type"
 182         default MARCH_G5
 183
 184 config MARCH_G5
 185         bool "System/390 model G5 and G6"
 186         depends on !64BIT
 187         help
 188           Select this to build a 31 bit kernel that works
 189           on all ESA/390 and z/Architecture machines.
 190
 191 config MARCH_Z900
 192         bool "IBM zSeries model z800 and z900"
 193         select HAVE_MARCH_Z900_FEATURES if 64BIT
 194         help
 195           Select this to enable optimizations for model z800/z900 (2064 and
 196           2066 series). This will enable some optimizations that are not
 197           available on older ESA/390 (31 Bit) only CPUs.
 198
 199 config MARCH_Z990
 200         bool "IBM zSeries model z890 and z990"
 201         select HAVE_MARCH_Z990_FEATURES if 64BIT
 202         help
 203           Select this to enable optimizations for model z890/z990 (2084 and
 204           2086 series). The kernel will be slightly faster but will not work
 205           on older machines.
 206
 207 config MARCH_Z9_109
 208         bool "IBM System z9"
 209         select HAVE_MARCH_Z9_109_FEATURES if 64BIT
 210         help
 211           Select this to enable optimizations for IBM System z9 (2094 and
 212           2096 series). The kernel will be slightly faster but will not work
 213           on older machines.
 214
 215 config MARCH_Z10
 216         bool "IBM System z10"
 217         select HAVE_MARCH_Z10_FEATURES if 64BIT
 218         help
 219           Select this to enable optimizations for IBM System z10 (2097 and
 220           2098 series). The kernel will be slightly faster but will not work
 221           on older machines.
 222
 223 config MARCH_Z196
 224         bool "IBM zEnterprise 114 and 196"
 225         select HAVE_MARCH_Z196_FEATURES if 64BIT
 226         help
 227           Select this to enable optimizations for IBM zEnterprise 114 and 196
 228           (2818 and 2817 series). The kernel will be slightly faster but will
 229           not work on older machines.
 230
 231 config MARCH_ZEC12
 232         bool "IBM zBC12 and zEC12"
 233         select HAVE_MARCH_ZEC12_FEATURES if 64BIT
 234         help
 235           Select this to enable optimizations for IBM zBC12 and zEC12 (2828 and
 236           2827 series). The kernel will be slightly faster but will not work on
 237           older machines.
 238
 239 endchoice
 240
 241 config MARCH_G5_TUNE
 242         def_bool TUNE_G5 || MARCH_G5 && TUNE_DEFAULT
 243
 244 config MARCH_Z900_TUNE
 245         def_bool TUNE_Z900 || MARCH_Z900 && TUNE_DEFAULT
 246
 247 config MARCH_Z990_TUNE
 248         def_bool TUNE_Z990 || MARCH_Z990 && TUNE_DEFAULT
 249
 250 config MARCH_Z9_109_TUNE
 251         def_bool TUNE_Z9_109 || MARCH_Z9_109 && TUNE_DEFAULT
 252
 253 config MARCH_Z10_TUNE
 254         def_bool TUNE_Z10 || MARCH_Z10 && TUNE_DEFAULT
 255
 256 config MARCH_Z196_TUNE
 257         def_bool TUNE_Z196 || MARCH_Z196 && TUNE_DEFAULT
 258
 259 config MARCH_ZEC12_TUNE
 260         def_bool TUNE_ZEC12 || MARCH_ZEC12 && TUNE_DEFAULT
 261
 262 choice
 263         prompt "Tune code generation"
 264         default TUNE_DEFAULT
 265         help
 266           Cause the compiler to tune (-mtune) the generated code for a machine.
 267           This will make the code run faster on the selected machine but
 268           somewhat slower on other machines.
 269           This option only changes how the compiler emits instructions, not the
 270           selection of instructions itself, so the resulting kernel will run on
 271           all other machines.
 272
 273 config TUNE_DEFAULT
 274         bool "Default"
 275         help
 276           Tune the generated code for the target processor for which the kernel
 277           will be compiled.
 278
 279 config TUNE_G5
 280         bool "System/390 model G5 and G6"
 281
 282 config TUNE_Z900
 283         bool "IBM zSeries model z800 and z900"
 284
 285 config TUNE_Z990
 286         bool "IBM zSeries model z890 and z990"
 287
 288 config TUNE_Z9_109
 289         bool "IBM System z9"
 290
 291 config TUNE_Z10
 292         bool "IBM System z10"
 293
 294 config TUNE_Z196
 295         bool "IBM zEnterprise 114 and 196"
 296
 297 config TUNE_ZEC12
 298         bool "IBM zBC12 and zEC12"
 299
 300 endchoice
 301
 302 config 64BIT
 303         def_bool y
 304         prompt "64 bit kernel"
 305         help
 306           Select this option if you have an IBM z/Architecture machine
 307           and want to use the 64 bit addressing mode.
 308
 309 config 32BIT
 310         def_bool y if !64BIT
 311
 312 config COMPAT
 313         def_bool y
 314         prompt "Kernel support for 31 bit emulation"
 315         depends on 64BIT
 316         select COMPAT_BINFMT_ELF if BINFMT_ELF
 317         select ARCH_WANT_OLD_COMPAT_IPC
 318         select COMPAT_OLD_SIGACTION
 319         help
 320           Select this option if you want to enable your system kernel to
 321           handle system-calls from ELF binaries for 31 bit ESA.  This option
 322           (and some other stuff like libraries and such) is needed for
 323           executing 31 bit applications.  It is safe to say "Y".
 324
 325 config SYSVIPC_COMPAT
 326         def_bool y if COMPAT && SYSVIPC
 327
 328 config KEYS_COMPAT
 329         def_bool y if COMPAT && KEYS
 330
 331 config SMP
 332         def_bool y
 333         prompt "Symmetric multi-processing support"
 334         ---help---
 335           This enables support for systems with more than one CPU. If you have
 336           a system with only one CPU, like most personal computers, say N. If
 337           you have a system with more than one CPU, say Y.
 338
 339           If you say N here, the kernel will run on single and multiprocessor
 340           machines, but will use only one CPU of a multiprocessor machine. If
 341           you say Y here, the kernel will run on many, but not all,
 342           singleprocessor machines. On a singleprocessor machine, the kernel
 343           will run faster if you say N here.
 344
 345           See also the SMP-HOWTO available at
 346           <http://www.tldp.org/docs.html#howto>.
 347
 348           Even if you don't know what to do here, say Y.
 349
 350 config NR_CPUS
 351         int "Maximum number of CPUs (2-64)"
 352         range 2 64
 353         depends on SMP
 354         default "32" if !64BIT
 355         default "64" if 64BIT
 356         help
 357           This allows you to specify the maximum number of CPUs which this
 358           kernel will support.  The maximum supported value is 64 and the
 359           minimum value which makes sense is 2.
 360
 361           This is purely to save memory - each supported CPU adds
 362           approximately sixteen kilobytes to the kernel image.
 363
 364 config HOTPLUG_CPU
 365         def_bool y
 366         prompt "Support for hot-pluggable CPUs"
 367         depends on SMP
 368         help
 369           Say Y here to be able to turn CPUs off and on. CPUs
 370           can be controlled through /sys/devices/system/cpu/cpu#.
 371           Say N if you want to disable CPU hotplug.
 372
 373 config SCHED_MC
 374         def_bool n
 375
 376 config SCHED_BOOK
 377         def_bool y
 378         prompt "Book scheduler support"
 379         depends on SMP
 380         select SCHED_MC
 381         help
 382           Book scheduler support improves the CPU scheduler's decision making
 383           when dealing with machines that have several books.
 384
 385 source kernel/Kconfig.preempt
 386
 387 config MATHEMU
 388         def_bool y
 389         prompt "IEEE FPU emulation"
 390         depends on MARCH_G5
 391         help
 392           This option is required for IEEE compliant floating point arithmetic
 393           on older ESA/390 machines. Say Y unless you know your machine doesn't
 394           need this.
 395
 396 source kernel/Kconfig.hz
 397
 398 endmenu
 399
 400 menu "Memory setup"
 401
 402 config ARCH_SPARSEMEM_ENABLE
 403         def_bool y
 404         select SPARSEMEM_VMEMMAP_ENABLE
 405         select SPARSEMEM_VMEMMAP
 406         select SPARSEMEM_STATIC if !64BIT
 407
 408 config ARCH_SPARSEMEM_DEFAULT
 409         def_bool y
 410
 411 config ARCH_SELECT_MEMORY_MODEL
 412         def_bool y
 413
 414 config ARCH_ENABLE_MEMORY_HOTPLUG
 415         def_bool y if SPARSEMEM
 416
 417 config ARCH_ENABLE_MEMORY_HOTREMOVE
 418         def_bool y
 419
 420 config FORCE_MAX_ZONEORDER
 421         int
 422         default "9"
 423
 424 source "mm/Kconfig"
 425
 426 config PACK_STACK
 427         def_bool y
 428         prompt "Pack kernel stack"
 429         help
 430           This option enables the compiler option -mkernel-backchain if it
 431           is available. If the option is available the compiler supports
 432           the new stack layout which dramatically reduces the minimum stack
 433           frame size. With an old compiler a non-leaf function needs a
 434           minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
 435           -mkernel-backchain the minimum size drops to 16 byte on 31 bit
 436           and 24 byte on 64 bit.
 437
 438           Say Y if you are unsure.
 439
 440 config CHECK_STACK
 441         def_bool y
 442         prompt "Detect kernel stack overflow"
 443         help
 444           This option enables the compiler option -mstack-guard and
 445           -mstack-size if they are available. If the compiler supports them
 446           it will emit additional code to each function prolog to trigger
 447           an illegal operation if the kernel stack is about to overflow.
 448
 449           Say N if you are unsure.
 450
 451 config STACK_GUARD
 452         int "Size of the guard area (128-1024)"
 453         range 128 1024
 454         depends on CHECK_STACK
 455         default "256"
 456         help
 457           This allows you to specify the size of the guard area at the lower
 458           end of the kernel stack. If the kernel stack points into the guard
 459           area on function entry an illegal operation is triggered. The size
 460           needs to be a power of 2. Please keep in mind that the size of an
 461           interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
 462           The minimum size for the stack guard should be 256 for 31 bit and
 463           512 for 64 bit.
 464
 465 config WARN_DYNAMIC_STACK
 466         def_bool n
 467         prompt "Emit compiler warnings for function with dynamic stack usage"
 468         help
 469           This option enables the compiler option -mwarn-dynamicstack. If the
 470           compiler supports this options generates warnings for functions
 471           that dynamically allocate stack space using alloca.
 472
 473           Say N if you are unsure.
 474
 475 endmenu
 476
 477 menu "I/O subsystem"
 478
 479 config QDIO
 480         def_tristate y
 481         prompt "QDIO support"
 482         ---help---
 483           This driver provides the Queued Direct I/O base support for
 484           IBM System z.
 485
 486           To compile this driver as a module, choose M here: the
 487           module will be called qdio.
 488
 489           If unsure, say Y.
 490
 491 menuconfig PCI
 492         bool "PCI support"
 493         default n
 494         depends on 64BIT
 495         select PCI_MSI
 496         help
 497           Enable PCI support.
 498
 499 if PCI
 500
 501 config PCI_NR_FUNCTIONS
 502         int "Maximum number of PCI functions (1-4096)"
 503         range 1 4096
 504         default "64"
 505         help
 506           This allows you to specify the maximum number of PCI functions which
 507           this kernel will support.
 508
 509 config PCI_NR_MSI
 510         int "Maximum number of MSI interrupts (64-32768)"
 511         range 64 32768
 512         default "256"
 513         help
 514           This defines the number of virtual interrupts the kernel will
 515           provide for MSI interrupts. If you configure your system to have
 516           too few drivers will fail to allocate MSI interrupts for all
 517           PCI devices.
 518
 519 source "drivers/pci/Kconfig"
 520 source "drivers/pci/pcie/Kconfig"
 521 source "drivers/pci/hotplug/Kconfig"
 522
 523 endif   # PCI
 524
 525 config PCI_DOMAINS
 526         def_bool PCI
 527
 528 config HAS_IOMEM
 529         def_bool PCI
 530
 531 config IOMMU_HELPER
 532         def_bool PCI
 533
 534 config HAS_DMA
 535         def_bool PCI
 536         select HAVE_DMA_API_DEBUG
 537
 538 config NEED_SG_DMA_LENGTH
 539         def_bool PCI
 540
 541 config HAVE_DMA_ATTRS
 542         def_bool PCI
 543
 544 config NEED_DMA_MAP_STATE
 545         def_bool PCI
 546
 547 config CHSC_SCH
 548         def_tristate m
 549         prompt "Support for CHSC subchannels"
 550         help
 551           This driver allows usage of CHSC subchannels. A CHSC subchannel
 552           is usually present on LPAR only.
 553           The driver creates a device /dev/chsc, which may be used to
 554           obtain I/O configuration information about the machine and
 555           to issue asynchronous chsc commands (DANGEROUS).
 556           You will usually only want to use this interface on a special
 557           LPAR designated for system management.
 558
 559           To compile this driver as a module, choose M here: the
 560           module will be called chsc_sch.
 561
 562           If unsure, say N.
 563
 564 config SCM_BUS
 565         def_bool y
 566         depends on 64BIT
 567         prompt "SCM bus driver"
 568         help
 569           Bus driver for Storage Class Memory.
 570
 571 config EADM_SCH
 572         def_tristate m
 573         prompt "Support for EADM subchannels"
 574         depends on SCM_BUS
 575         help
 576           This driver allows usage of EADM subchannels. EADM subchannels act
 577           as a communication vehicle for SCM increments.
 578
 579           To compile this driver as a module, choose M here: the
 580           module will be called eadm_sch.
 581
 582 endmenu
 583
 584 menu "Dump support"
 585
 586 config CRASH_DUMP
 587         bool "kernel crash dumps"
 588         depends on 64BIT && SMP
 589         select KEXEC
 590         select ZFCPDUMP
 591         help
 592           Generate crash dump after being started by kexec.
 593           Crash dump kernels are loaded in the main kernel with kexec-tools
 594           into a specially reserved region and then later executed after
 595           a crash by kdump/kexec.
 596           For more details see Documentation/kdump/kdump.txt
 597
 598 config ZFCPDUMP
 599         def_bool n
 600         prompt "zfcpdump support"
 601         depends on SMP
 602         help
 603           Select this option if you want to build an zfcpdump enabled kernel.
 604           Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this.
 605
 606 endmenu
 607
 608 menu "Executable file formats / Emulations"
 609
 610 source "fs/Kconfig.binfmt"
 611
 612 config SECCOMP
 613         def_bool y
 614         prompt "Enable seccomp to safely compute untrusted bytecode"
 615         depends on PROC_FS
 616         help
 617           This kernel feature is useful for number crunching applications
 618           that may need to compute untrusted bytecode during their
 619           execution. By using pipes or other transports made available to
 620           the process as file descriptors supporting the read/write
 621           syscalls, it's possible to isolate those applications in
 622           their own address space using seccomp. Once seccomp is
 623           enabled via /proc/<pid>/seccomp, it cannot be disabled
 624           and the task is only allowed to execute a few safe syscalls
 625           defined by each seccomp mode.
 626
 627           If unsure, say Y.
 628
 629 endmenu
 630
 631 menu "Power Management"
 632
 633 config ARCH_HIBERNATION_POSSIBLE
 634         def_bool y if 64BIT
 635
 636 source "kernel/power/Kconfig"
 637
 638 endmenu
 639
 640 source "net/Kconfig"
 641
 642 config PCMCIA
 643         def_bool n
 644
 645 config CCW
 646         def_bool y
 647
 648 source "drivers/Kconfig"
 649
 650 source "fs/Kconfig"
 651
 652 source "arch/s390/Kconfig.debug"
 653
 654 source "security/Kconfig"
 655
 656 source "crypto/Kconfig"
 657
 658 source "lib/Kconfig"
 659
 660 menu "Virtualization"
 661
 662 config PFAULT
 663         def_bool y
 664         prompt "Pseudo page fault support"
 665         help
 666           Select this option, if you want to use PFAULT pseudo page fault
 667           handling under VM. If running native or in LPAR, this option
 668           has no effect. If your VM does not support PFAULT, PAGEEX
 669           pseudo page fault handling will be used.
 670           Note that VM 4.2 supports PFAULT but has a bug in its
 671           implementation that causes some problems.
 672           Everybody who wants to run Linux under VM != VM4.2 should select
 673           this option.
 674
 675 config SHARED_KERNEL
 676         bool "VM shared kernel support"
 677         depends on !JUMP_LABEL
 678         help
 679           Select this option, if you want to share the text segment of the
 680           Linux kernel between different VM guests. This reduces memory
 681           usage with lots of guests but greatly increases kernel size.
 682           Also if a kernel was IPL'ed from a shared segment the kexec system
 683           call will not work.
 684           You should only select this option if you know what you are
 685           doing and want to exploit this feature.
 686
 687 config CMM
 688         def_tristate n
 689         prompt "Cooperative memory management"
 690         help
 691           Select this option, if you want to enable the kernel interface
 692           to reduce the memory size of the system. This is accomplished
 693           by allocating pages of memory and put them "on hold". This only
 694           makes sense for a system running under VM where the unused pages
 695           will be reused by VM for other guest systems. The interface
 696           allows an external monitor to balance memory of many systems.
 697           Everybody who wants to run Linux under VM should select this
 698           option.
 699
 700 config CMM_IUCV
 701         def_bool y
 702         prompt "IUCV special message interface to cooperative memory management"
 703         depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
 704         help
 705           Select this option to enable the special message interface to
 706           the cooperative memory management.
 707
 708 config APPLDATA_BASE
 709         def_bool n
 710         prompt "Linux - VM Monitor Stream, base infrastructure"
 711         depends on PROC_FS
 712         help
 713           This provides a kernel interface for creating and updating z/VM APPLDATA
 714           monitor records. The monitor records are updated at certain time
 715           intervals, once the timer is started.
 716           Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
 717           i.e. enables or disables monitoring on the Linux side.
 718           A custom interval value (in seconds) can be written to
 719           /proc/appldata/interval.
 720
 721           Defaults are 60 seconds interval and timer off.
 722           The /proc entries can also be read from, showing the current settings.
 723
 724 config APPLDATA_MEM
 725         def_tristate m
 726         prompt "Monitor memory management statistics"
 727         depends on APPLDATA_BASE && VM_EVENT_COUNTERS
 728         help
 729           This provides memory management related data to the Linux - VM Monitor
 730           Stream, like paging/swapping rate, memory utilisation, etc.
 731           Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
 732           APPLDATA monitor record, i.e. enables or disables monitoring this record
 733           on the z/VM side.
 734
 735           Default is disabled.
 736           The /proc entry can also be read from, showing the current settings.
 737
 738           This can also be compiled as a module, which will be called
 739           appldata_mem.o.
 740
 741 config APPLDATA_OS
 742         def_tristate m
 743         prompt "Monitor OS statistics"
 744         depends on APPLDATA_BASE
 745         help
 746           This provides OS related data to the Linux - VM Monitor Stream, like
 747           CPU utilisation, etc.
 748           Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
 749           APPLDATA monitor record, i.e. enables or disables monitoring this record
 750           on the z/VM side.
 751
 752           Default is disabled.
 753           This can also be compiled as a module, which will be called
 754           appldata_os.o.
 755
 756 config APPLDATA_NET_SUM
 757         def_tristate m
 758         prompt "Monitor overall network statistics"
 759         depends on APPLDATA_BASE && NET
 760         help
 761           This provides network related data to the Linux - VM Monitor Stream,
 762           currently there is only a total sum of network I/O statistics, no
 763           per-interface data.
 764           Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
 765           APPLDATA monitor record, i.e. enables or disables monitoring this record
 766           on the z/VM side.
 767
 768           Default is disabled.
 769           This can also be compiled as a module, which will be called
 770           appldata_net_sum.o.
 771
 772 config S390_HYPFS_FS
 773         def_bool y
 774         prompt "s390 hypervisor file system support"
 775         select SYS_HYPERVISOR
 776         help
 777           This is a virtual file system intended to provide accounting
 778           information in an s390 hypervisor environment.
 779
 780 source "arch/s390/kvm/Kconfig"
 781
 782 config S390_GUEST
 783         def_bool y
 784         prompt "s390 support for virtio devices"
 785         depends on 64BIT
 786         select TTY
 787         select VIRTUALIZATION
 788         select VIRTIO
 789         select VIRTIO_CONSOLE
 790         help
 791           Enabling this option adds support for virtio based paravirtual device
 792           drivers on s390.
 793
 794           Select this option if you want to run the kernel as a guest under
 795           the KVM hypervisor.
 796
 797 endmenu