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