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