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 y
  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 ARCH_SUPPORTS_UPROBES
  62         def_bool y
  63
  64 config S390
  65         def_bool y
  66         select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
  67         select ARCH_HAS_DEBUG_STRICT_USER_COPY_CHECKS
  68         select ARCH_HAS_ELF_RANDOMIZE
  69         select ARCH_HAS_GCOV_PROFILE_ALL
  70         select ARCH_HAS_SG_CHAIN
  71         select ARCH_HAVE_NMI_SAFE_CMPXCHG
  72         select ARCH_INLINE_READ_LOCK
  73         select ARCH_INLINE_READ_LOCK_BH
  74         select ARCH_INLINE_READ_LOCK_IRQ
  75         select ARCH_INLINE_READ_LOCK_IRQSAVE
  76         select ARCH_INLINE_READ_TRYLOCK
  77         select ARCH_INLINE_READ_UNLOCK
  78         select ARCH_INLINE_READ_UNLOCK_BH
  79         select ARCH_INLINE_READ_UNLOCK_IRQ
  80         select ARCH_INLINE_READ_UNLOCK_IRQRESTORE
  81         select ARCH_INLINE_SPIN_LOCK
  82         select ARCH_INLINE_SPIN_LOCK_BH
  83         select ARCH_INLINE_SPIN_LOCK_IRQ
  84         select ARCH_INLINE_SPIN_LOCK_IRQSAVE
  85         select ARCH_INLINE_SPIN_TRYLOCK
  86         select ARCH_INLINE_SPIN_TRYLOCK_BH
  87         select ARCH_INLINE_SPIN_UNLOCK
  88         select ARCH_INLINE_SPIN_UNLOCK_BH
  89         select ARCH_INLINE_SPIN_UNLOCK_IRQ
  90         select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE
  91         select ARCH_INLINE_WRITE_LOCK
  92         select ARCH_INLINE_WRITE_LOCK_BH
  93         select ARCH_INLINE_WRITE_LOCK_IRQ
  94         select ARCH_INLINE_WRITE_LOCK_IRQSAVE
  95         select ARCH_INLINE_WRITE_TRYLOCK
  96         select ARCH_INLINE_WRITE_UNLOCK
  97         select ARCH_INLINE_WRITE_UNLOCK_BH
  98         select ARCH_INLINE_WRITE_UNLOCK_IRQ
  99         select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE
 100         select ARCH_SAVE_PAGE_KEYS if HIBERNATION
 101         select ARCH_SUPPORTS_ATOMIC_RMW
 102         select ARCH_USE_CMPXCHG_LOCKREF
 103         select ARCH_WANT_IPC_PARSE_VERSION
 104         select BUILDTIME_EXTABLE_SORT
 105         select CLONE_BACKWARDS2
 106         select DYNAMIC_FTRACE if FUNCTION_TRACER
 107         select GENERIC_CLOCKEVENTS
 108         select GENERIC_CPU_DEVICES if !SMP
 109         select GENERIC_FIND_FIRST_BIT
 110         select GENERIC_SMP_IDLE_THREAD
 111         select GENERIC_TIME_VSYSCALL
 112         select HAVE_ALIGNED_STRUCT_PAGE if SLUB
 113         select HAVE_ARCH_AUDITSYSCALL
 114         select HAVE_ARCH_JUMP_LABEL
 115         select HAVE_ARCH_SECCOMP_FILTER
 116         select HAVE_ARCH_TRACEHOOK
 117         select HAVE_ARCH_TRANSPARENT_HUGEPAGE
 118         select HAVE_BPF_JIT if PACK_STACK && HAVE_MARCH_Z196_FEATURES
 119         select HAVE_CMPXCHG_DOUBLE
 120         select HAVE_CMPXCHG_LOCAL
 121         select HAVE_DEBUG_KMEMLEAK
 122         select HAVE_DYNAMIC_FTRACE
 123         select HAVE_DYNAMIC_FTRACE_WITH_REGS
 124         select HAVE_FTRACE_MCOUNT_RECORD
 125         select HAVE_FUNCTION_GRAPH_TRACER
 126         select HAVE_FUNCTION_TRACER
 127         select HAVE_FUTEX_CMPXCHG if FUTEX
 128         select HAVE_KERNEL_BZIP2
 129         select HAVE_KERNEL_GZIP
 130         select HAVE_KERNEL_LZ4
 131         select HAVE_KERNEL_LZMA
 132         select HAVE_KERNEL_LZO
 133         select HAVE_KERNEL_XZ
 134         select HAVE_KPROBES
 135         select HAVE_KRETPROBES
 136         select HAVE_KVM
 137         select HAVE_LIVEPATCH
 138         select HAVE_MEMBLOCK
 139         select HAVE_MEMBLOCK_NODE_MAP
 140         select HAVE_MEMBLOCK_PHYS_MAP
 141         select HAVE_MOD_ARCH_SPECIFIC
 142         select HAVE_OPROFILE
 143         select HAVE_PERF_EVENTS
 144         select HAVE_REGS_AND_STACK_ACCESS_API
 145         select HAVE_SYSCALL_TRACEPOINTS
 146         select HAVE_VIRT_CPU_ACCOUNTING
 147         select MODULES_USE_ELF_RELA
 148         select NO_BOOTMEM
 149         select OLD_SIGACTION
 150         select OLD_SIGSUSPEND3
 151         select SYSCTL_EXCEPTION_TRACE
 152         select TTY
 153         select VIRT_CPU_ACCOUNTING
 154         select VIRT_TO_BUS
 155
 156 config SCHED_OMIT_FRAME_POINTER
 157         def_bool y
 158
 159 config PGTABLE_LEVELS
 160         int
 161         default 4 if 64BIT
 162         default 2
 163
 164 source "init/Kconfig"
 165
 166 source "kernel/Kconfig.freezer"
 167
 168 source "kernel/livepatch/Kconfig"
 169
 170 menu "Processor type and features"
 171
 172 config HAVE_MARCH_Z900_FEATURES
 173         def_bool n
 174
 175 config HAVE_MARCH_Z990_FEATURES
 176         def_bool n
 177         select HAVE_MARCH_Z900_FEATURES
 178
 179 config HAVE_MARCH_Z9_109_FEATURES
 180         def_bool n
 181         select HAVE_MARCH_Z990_FEATURES
 182
 183 config HAVE_MARCH_Z10_FEATURES
 184         def_bool n
 185         select HAVE_MARCH_Z9_109_FEATURES
 186
 187 config HAVE_MARCH_Z196_FEATURES
 188         def_bool n
 189         select HAVE_MARCH_Z10_FEATURES
 190
 191 config HAVE_MARCH_ZEC12_FEATURES
 192         def_bool n
 193         select HAVE_MARCH_Z196_FEATURES
 194
 195 config HAVE_MARCH_Z13_FEATURES
 196         def_bool n
 197         select HAVE_MARCH_ZEC12_FEATURES
 198
 199 choice
 200         prompt "Processor type"
 201         default MARCH_Z900
 202
 203 config MARCH_Z900
 204         bool "IBM zSeries model z800 and z900"
 205         select HAVE_MARCH_Z900_FEATURES
 206         help
 207           Select this to enable optimizations for model z800/z900 (2064 and
 208           2066 series). This will enable some optimizations that are not
 209           available on older ESA/390 (31 Bit) only CPUs.
 210
 211 config MARCH_Z990
 212         bool "IBM zSeries model z890 and z990"
 213         select HAVE_MARCH_Z990_FEATURES
 214         help
 215           Select this to enable optimizations for model z890/z990 (2084 and
 216           2086 series). The kernel will be slightly faster but will not work
 217           on older machines.
 218
 219 config MARCH_Z9_109
 220         bool "IBM System z9"
 221         select HAVE_MARCH_Z9_109_FEATURES
 222         help
 223           Select this to enable optimizations for IBM System z9 (2094 and
 224           2096 series). The kernel will be slightly faster but will not work
 225           on older machines.
 226
 227 config MARCH_Z10
 228         bool "IBM System z10"
 229         select HAVE_MARCH_Z10_FEATURES
 230         help
 231           Select this to enable optimizations for IBM System z10 (2097 and
 232           2098 series). The kernel will be slightly faster but will not work
 233           on older machines.
 234
 235 config MARCH_Z196
 236         bool "IBM zEnterprise 114 and 196"
 237         select HAVE_MARCH_Z196_FEATURES
 238         help
 239           Select this to enable optimizations for IBM zEnterprise 114 and 196
 240           (2818 and 2817 series). The kernel will be slightly faster but will
 241           not work on older machines.
 242
 243 config MARCH_ZEC12
 244         bool "IBM zBC12 and zEC12"
 245         select HAVE_MARCH_ZEC12_FEATURES
 246         help
 247           Select this to enable optimizations for IBM zBC12 and zEC12 (2828 and
 248           2827 series). The kernel will be slightly faster but will not work on
 249           older machines.
 250
 251 config MARCH_Z13
 252         bool "IBM z13"
 253         select HAVE_MARCH_Z13_FEATURES
 254         help
 255           Select this to enable optimizations for IBM z13 (2964 series).
 256           The kernel will be slightly faster but will not work on older
 257           machines.
 258
 259 endchoice
 260
 261 config MARCH_Z900_TUNE
 262         def_bool TUNE_Z900 || MARCH_Z900 && TUNE_DEFAULT
 263
 264 config MARCH_Z990_TUNE
 265         def_bool TUNE_Z990 || MARCH_Z990 && TUNE_DEFAULT
 266
 267 config MARCH_Z9_109_TUNE
 268         def_bool TUNE_Z9_109 || MARCH_Z9_109 && TUNE_DEFAULT
 269
 270 config MARCH_Z10_TUNE
 271         def_bool TUNE_Z10 || MARCH_Z10 && TUNE_DEFAULT
 272
 273 config MARCH_Z196_TUNE
 274         def_bool TUNE_Z196 || MARCH_Z196 && TUNE_DEFAULT
 275
 276 config MARCH_ZEC12_TUNE
 277         def_bool TUNE_ZEC12 || MARCH_ZEC12 && TUNE_DEFAULT
 278
 279 config MARCH_Z13_TUNE
 280         def_bool TUNE_Z13 || MARCH_Z13 && TUNE_DEFAULT
 281
 282 choice
 283         prompt "Tune code generation"
 284         default TUNE_DEFAULT
 285         help
 286           Cause the compiler to tune (-mtune) the generated code for a machine.
 287           This will make the code run faster on the selected machine but
 288           somewhat slower on other machines.
 289           This option only changes how the compiler emits instructions, not the
 290           selection of instructions itself, so the resulting kernel will run on
 291           all other machines.
 292
 293 config TUNE_DEFAULT
 294         bool "Default"
 295         help
 296           Tune the generated code for the target processor for which the kernel
 297           will be compiled.
 298
 299 config TUNE_Z900
 300         bool "IBM zSeries model z800 and z900"
 301
 302 config TUNE_Z990
 303         bool "IBM zSeries model z890 and z990"
 304
 305 config TUNE_Z9_109
 306         bool "IBM System z9"
 307
 308 config TUNE_Z10
 309         bool "IBM System z10"
 310
 311 config TUNE_Z196
 312         bool "IBM zEnterprise 114 and 196"
 313
 314 config TUNE_ZEC12
 315         bool "IBM zBC12 and zEC12"
 316
 317 config TUNE_Z13
 318         bool "IBM z13"
 319
 320 endchoice
 321
 322 config 64BIT
 323         def_bool y
 324
 325 config COMPAT
 326         def_bool y
 327         prompt "Kernel support for 31 bit emulation"
 328         select COMPAT_BINFMT_ELF if BINFMT_ELF
 329         select ARCH_WANT_OLD_COMPAT_IPC
 330         select COMPAT_OLD_SIGACTION
 331         depends on MULTIUSER
 332         help
 333           Select this option if you want to enable your system kernel to
 334           handle system-calls from ELF binaries for 31 bit ESA.  This option
 335           (and some other stuff like libraries and such) is needed for
 336           executing 31 bit applications.  It is safe to say "Y".
 337
 338 config SYSVIPC_COMPAT
 339         def_bool y if COMPAT && SYSVIPC
 340
 341 config KEYS_COMPAT
 342         def_bool y if COMPAT && KEYS
 343
 344 config SMP
 345         def_bool y
 346         prompt "Symmetric multi-processing support"
 347         ---help---
 348           This enables support for systems with more than one CPU. If you have
 349           a system with only one CPU, like most personal computers, say N. If
 350           you have a system with more than one CPU, say Y.
 351
 352           If you say N here, the kernel will run on uni- and multiprocessor
 353           machines, but will use only one CPU of a multiprocessor machine. If
 354           you say Y here, the kernel will run on many, but not all,
 355           uniprocessor machines. On a uniprocessor machine, the kernel
 356           will run faster if you say N here.
 357
 358           See also the SMP-HOWTO available at
 359           <http://www.tldp.org/docs.html#howto>.
 360
 361           Even if you don't know what to do here, say Y.
 362
 363 config NR_CPUS
 364         int "Maximum number of CPUs (2-512)"
 365         range 2 512
 366         depends on SMP
 367         default "64"
 368         help
 369           This allows you to specify the maximum number of CPUs which this
 370           kernel will support. The maximum supported value is 512 and the
 371           minimum value which makes sense is 2.
 372
 373           This is purely to save memory - each supported CPU adds
 374           approximately sixteen kilobytes to the kernel image.
 375
 376 config HOTPLUG_CPU
 377         def_bool y
 378         prompt "Support for hot-pluggable CPUs"
 379         depends on SMP
 380         help
 381           Say Y here to be able to turn CPUs off and on. CPUs
 382           can be controlled through /sys/devices/system/cpu/cpu#.
 383           Say N if you want to disable CPU hotplug.
 384
 385 config SCHED_SMT
 386         def_bool n
 387
 388 config SCHED_MC
 389         def_bool n
 390
 391 config SCHED_BOOK
 392         def_bool n
 393
 394 config SCHED_TOPOLOGY
 395         def_bool y
 396         prompt "Topology scheduler support"
 397         depends on SMP
 398         select SCHED_SMT
 399         select SCHED_MC
 400         select SCHED_BOOK
 401         help
 402           Topology scheduler support improves the CPU scheduler's decision
 403           making when dealing with machines that have multi-threading,
 404           multiple cores or multiple books.
 405
 406 source kernel/Kconfig.preempt
 407
 408 source kernel/Kconfig.hz
 409
 410 endmenu
 411
 412 menu "Memory setup"
 413
 414 config ARCH_SPARSEMEM_ENABLE
 415         def_bool y
 416         select SPARSEMEM_VMEMMAP_ENABLE
 417         select SPARSEMEM_VMEMMAP
 418
 419 config ARCH_SPARSEMEM_DEFAULT
 420         def_bool y
 421
 422 config ARCH_SELECT_MEMORY_MODEL
 423         def_bool y
 424
 425 config ARCH_ENABLE_MEMORY_HOTPLUG
 426         def_bool y if SPARSEMEM
 427
 428 config ARCH_ENABLE_MEMORY_HOTREMOVE
 429         def_bool y
 430
 431 config ARCH_ENABLE_SPLIT_PMD_PTLOCK
 432         def_bool y
 433
 434 config FORCE_MAX_ZONEORDER
 435         int
 436         default "9"
 437
 438 source "mm/Kconfig"
 439
 440 config PACK_STACK
 441         def_bool y
 442         prompt "Pack kernel stack"
 443         help
 444           This option enables the compiler option -mkernel-backchain if it
 445           is available. If the option is available the compiler supports
 446           the new stack layout which dramatically reduces the minimum stack
 447           frame size. With an old compiler a non-leaf function needs a
 448           minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
 449           -mkernel-backchain the minimum size drops to 16 byte on 31 bit
 450           and 24 byte on 64 bit.
 451
 452           Say Y if you are unsure.
 453
 454 config CHECK_STACK
 455         def_bool y
 456         prompt "Detect kernel stack overflow"
 457         help
 458           This option enables the compiler option -mstack-guard and
 459           -mstack-size if they are available. If the compiler supports them
 460           it will emit additional code to each function prolog to trigger
 461           an illegal operation if the kernel stack is about to overflow.
 462
 463           Say N if you are unsure.
 464
 465 config STACK_GUARD
 466         int "Size of the guard area (128-1024)"
 467         range 128 1024
 468         depends on CHECK_STACK
 469         default "256"
 470         help
 471           This allows you to specify the size of the guard area at the lower
 472           end of the kernel stack. If the kernel stack points into the guard
 473           area on function entry an illegal operation is triggered. The size
 474           needs to be a power of 2. Please keep in mind that the size of an
 475           interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
 476           The minimum size for the stack guard should be 256 for 31 bit and
 477           512 for 64 bit.
 478
 479 config WARN_DYNAMIC_STACK
 480         def_bool n
 481         prompt "Emit compiler warnings for function with dynamic stack usage"
 482         help
 483           This option enables the compiler option -mwarn-dynamicstack. If the
 484           compiler supports this options generates warnings for functions
 485           that dynamically allocate stack space using alloca.
 486
 487           Say N if you are unsure.
 488
 489 endmenu
 490
 491 menu "I/O subsystem"
 492
 493 config QDIO
 494         def_tristate y
 495         prompt "QDIO support"
 496         ---help---
 497           This driver provides the Queued Direct I/O base support for
 498           IBM System z.
 499
 500           To compile this driver as a module, choose M here: the
 501           module will be called qdio.
 502
 503           If unsure, say Y.
 504
 505 menuconfig PCI
 506         bool "PCI support"
 507         select HAVE_DMA_ATTRS
 508         select PCI_MSI
 509         help
 510           Enable PCI support.
 511
 512 if PCI
 513
 514 config PCI_NR_FUNCTIONS
 515         int "Maximum number of PCI functions (1-4096)"
 516         range 1 4096
 517         default "64"
 518         help
 519           This allows you to specify the maximum number of PCI functions which
 520           this kernel will support.
 521
 522 config PCI_NR_MSI
 523         int "Maximum number of MSI interrupts (64-32768)"
 524         range 64 32768
 525         default "256"
 526         help
 527           This defines the number of virtual interrupts the kernel will
 528           provide for MSI interrupts. If you configure your system to have
 529           too few drivers will fail to allocate MSI interrupts for all
 530           PCI devices.
 531
 532 source "drivers/pci/Kconfig"
 533 source "drivers/pci/pcie/Kconfig"
 534 source "drivers/pci/hotplug/Kconfig"
 535
 536 endif   # PCI
 537
 538 config PCI_DOMAINS
 539         def_bool PCI
 540
 541 config HAS_IOMEM
 542         def_bool PCI
 543
 544 config IOMMU_HELPER
 545         def_bool PCI
 546
 547 config HAS_DMA
 548         def_bool PCI
 549         select HAVE_DMA_API_DEBUG
 550
 551 config NEED_SG_DMA_LENGTH
 552         def_bool PCI
 553
 554 config NEED_DMA_MAP_STATE
 555         def_bool PCI
 556
 557 config CHSC_SCH
 558         def_tristate m
 559         prompt "Support for CHSC subchannels"
 560         help
 561           This driver allows usage of CHSC subchannels. A CHSC subchannel
 562           is usually present on LPAR only.
 563           The driver creates a device /dev/chsc, which may be used to
 564           obtain I/O configuration information about the machine and
 565           to issue asynchronous chsc commands (DANGEROUS).
 566           You will usually only want to use this interface on a special
 567           LPAR designated for system management.
 568
 569           To compile this driver as a module, choose M here: the
 570           module will be called chsc_sch.
 571
 572           If unsure, say N.
 573
 574 config SCM_BUS
 575         def_bool y
 576         prompt "SCM bus driver"
 577         help
 578           Bus driver for Storage Class Memory.
 579
 580 config EADM_SCH
 581         def_tristate m
 582         prompt "Support for EADM subchannels"
 583         depends on SCM_BUS
 584         help
 585           This driver allows usage of EADM subchannels. EADM subchannels act
 586           as a communication vehicle for SCM increments.
 587
 588           To compile this driver as a module, choose M here: the
 589           module will be called eadm_sch.
 590
 591 endmenu
 592
 593 menu "Dump support"
 594
 595 config CRASH_DUMP
 596         bool "kernel crash dumps"
 597         depends on SMP
 598         select KEXEC
 599         help
 600           Generate crash dump after being started by kexec.
 601           Crash dump kernels are loaded in the main kernel with kexec-tools
 602           into a specially reserved region and then later executed after
 603           a crash by kdump/kexec.
 604           Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this.
 605           This option also enables s390 zfcpdump.
 606           See also <file:Documentation/s390/zfcpdump.txt>
 607
 608 endmenu
 609
 610 menu "Executable file formats / Emulations"
 611
 612 source "fs/Kconfig.binfmt"
 613
 614 config SECCOMP
 615         def_bool y
 616         prompt "Enable seccomp to safely compute untrusted bytecode"
 617         depends on PROC_FS
 618         help
 619           This kernel feature is useful for number crunching applications
 620           that may need to compute untrusted bytecode during their
 621           execution. By using pipes or other transports made available to
 622           the process as file descriptors supporting the read/write
 623           syscalls, it's possible to isolate those applications in
 624           their own address space using seccomp. Once seccomp is
 625           enabled via /proc/<pid>/seccomp, it cannot be disabled
 626           and the task is only allowed to execute a few safe syscalls
 627           defined by each seccomp mode.
 628
 629           If unsure, say Y.
 630
 631 endmenu
 632
 633 menu "Power Management"
 634
 635 config ARCH_HIBERNATION_POSSIBLE
 636         def_bool y
 637
 638 source "kernel/power/Kconfig"
 639
 640 endmenu
 641
 642 source "net/Kconfig"
 643
 644 config PCMCIA
 645         def_bool n
 646
 647 config CCW
 648         def_bool y
 649
 650 source "drivers/Kconfig"
 651
 652 source "fs/Kconfig"
 653
 654 source "arch/s390/Kconfig.debug"
 655
 656 source "security/Kconfig"
 657
 658 source "crypto/Kconfig"
 659
 660 source "lib/Kconfig"
 661
 662 menu "Virtualization"
 663
 664 config PFAULT
 665         def_bool y
 666         prompt "Pseudo page fault support"
 667         help
 668           Select this option, if you want to use PFAULT pseudo page fault
 669           handling under VM. If running native or in LPAR, this option
 670           has no effect. If your VM does not support PFAULT, PAGEEX
 671           pseudo page fault handling will be used.
 672           Note that VM 4.2 supports PFAULT but has a bug in its
 673           implementation that causes some problems.
 674           Everybody who wants to run Linux under VM != VM4.2 should select
 675           this option.
 676
 677 config SHARED_KERNEL
 678         bool "VM shared kernel support"
 679         depends on !JUMP_LABEL
 680         help
 681           Select this option, if you want to share the text segment of the
 682           Linux kernel between different VM guests. This reduces memory
 683           usage with lots of guests but greatly increases kernel size.
 684           Also if a kernel was IPL'ed from a shared segment the kexec system
 685           call will not work.
 686           You should only select this option if you know what you are
 687           doing and want to exploit this feature.
 688
 689 config CMM
 690         def_tristate n
 691         prompt "Cooperative memory management"
 692         help
 693           Select this option, if you want to enable the kernel interface
 694           to reduce the memory size of the system. This is accomplished
 695           by allocating pages of memory and put them "on hold". This only
 696           makes sense for a system running under VM where the unused pages
 697           will be reused by VM for other guest systems. The interface
 698           allows an external monitor to balance memory of many systems.
 699           Everybody who wants to run Linux under VM should select this
 700           option.
 701
 702 config CMM_IUCV
 703         def_bool y
 704         prompt "IUCV special message interface to cooperative memory management"
 705         depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
 706         help
 707           Select this option to enable the special message interface to
 708           the cooperative memory management.
 709
 710 config APPLDATA_BASE
 711         def_bool n
 712         prompt "Linux - VM Monitor Stream, base infrastructure"
 713         depends on PROC_FS
 714         help
 715           This provides a kernel interface for creating and updating z/VM APPLDATA
 716           monitor records. The monitor records are updated at certain time
 717           intervals, once the timer is started.
 718           Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
 719           i.e. enables or disables monitoring on the Linux side.
 720           A custom interval value (in seconds) can be written to
 721           /proc/appldata/interval.
 722
 723           Defaults are 60 seconds interval and timer off.
 724           The /proc entries can also be read from, showing the current settings.
 725
 726 config APPLDATA_MEM
 727         def_tristate m
 728         prompt "Monitor memory management statistics"
 729         depends on APPLDATA_BASE && VM_EVENT_COUNTERS
 730         help
 731           This provides memory management related data to the Linux - VM Monitor
 732           Stream, like paging/swapping rate, memory utilisation, etc.
 733           Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
 734           APPLDATA monitor record, i.e. enables or disables monitoring this record
 735           on the z/VM side.
 736
 737           Default is disabled.
 738           The /proc entry can also be read from, showing the current settings.
 739
 740           This can also be compiled as a module, which will be called
 741           appldata_mem.o.
 742
 743 config APPLDATA_OS
 744         def_tristate m
 745         prompt "Monitor OS statistics"
 746         depends on APPLDATA_BASE
 747         help
 748           This provides OS related data to the Linux - VM Monitor Stream, like
 749           CPU utilisation, etc.
 750           Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
 751           APPLDATA monitor record, i.e. enables or disables monitoring this record
 752           on the z/VM side.
 753
 754           Default is disabled.
 755           This can also be compiled as a module, which will be called
 756           appldata_os.o.
 757
 758 config APPLDATA_NET_SUM
 759         def_tristate m
 760         prompt "Monitor overall network statistics"
 761         depends on APPLDATA_BASE && NET
 762         help
 763           This provides network related data to the Linux - VM Monitor Stream,
 764           currently there is only a total sum of network I/O statistics, no
 765           per-interface data.
 766           Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
 767           APPLDATA monitor record, i.e. enables or disables monitoring this record
 768           on the z/VM side.
 769
 770           Default is disabled.
 771           This can also be compiled as a module, which will be called
 772           appldata_net_sum.o.
 773
 774 config S390_HYPFS_FS
 775         def_bool y
 776         prompt "s390 hypervisor file system support"
 777         select SYS_HYPERVISOR
 778         help
 779           This is a virtual file system intended to provide accounting
 780           information in an s390 hypervisor environment.
 781
 782 source "arch/s390/kvm/Kconfig"
 783
 784 config S390_GUEST
 785         def_bool y
 786         prompt "s390 support for virtio devices"
 787         select TTY
 788         select VIRTUALIZATION
 789         select VIRTIO
 790         select VIRTIO_CONSOLE
 791         help
 792           Enabling this option adds support for virtio based paravirtual device
 793           drivers on s390.
 794
 795           Select this option if you want to run the kernel as a guest under
 796           the KVM hypervisor.
 797
 798 endmenu