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 RWSEM_GENERIC_SPINLOCK
  14         bool
  15
  16 config RWSEM_XCHGADD_ALGORITHM
  17         def_bool y
  18
  19 config ARCH_HAS_ILOG2_U32
  20         def_bool n
  21
  22 config ARCH_HAS_ILOG2_U64
  23         def_bool n
  24
  25 config GENERIC_HWEIGHT
  26         def_bool y
  27
  28 config GENERIC_BUG
  29         def_bool y if BUG
  30
  31 config GENERIC_BUG_RELATIVE_POINTERS
  32         def_bool y
  33
  34 config ARCH_DMA_ADDR_T_64BIT
  35         def_bool y
  36
  37 config GENERIC_LOCKBREAK
  38         def_bool y if SMP && PREEMPT
  39
  40 config PGSTE
  41         def_bool y if KVM
  42
  43 config ARCH_SUPPORTS_DEBUG_PAGEALLOC
  44         def_bool y
  45
  46 config KEXEC
  47         def_bool y
  48         select KEXEC_CORE
  49
  50 config AUDIT_ARCH
  51         def_bool y
  52
  53 config NO_IOPORT_MAP
  54         def_bool y
  55
  56 config PCI_QUIRKS
  57         def_bool n
  58
  59 config ARCH_SUPPORTS_UPROBES
  60         def_bool y
  61
  62 config DEBUG_RODATA
  63         def_bool y
  64
  65 config S390
  66         def_bool y
  67         select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
  68         select ARCH_HAS_DEBUG_STRICT_USER_COPY_CHECKS
  69         select ARCH_HAS_DEVMEM_IS_ALLOWED
  70         select ARCH_HAS_ELF_RANDOMIZE
  71         select ARCH_HAS_GCOV_PROFILE_ALL
  72         select ARCH_HAS_SG_CHAIN
  73         select ARCH_HAVE_NMI_SAFE_CMPXCHG
  74         select ARCH_INLINE_READ_LOCK
  75         select ARCH_INLINE_READ_LOCK_BH
  76         select ARCH_INLINE_READ_LOCK_IRQ
  77         select ARCH_INLINE_READ_LOCK_IRQSAVE
  78         select ARCH_INLINE_READ_TRYLOCK
  79         select ARCH_INLINE_READ_UNLOCK
  80         select ARCH_INLINE_READ_UNLOCK_BH
  81         select ARCH_INLINE_READ_UNLOCK_IRQ
  82         select ARCH_INLINE_READ_UNLOCK_IRQRESTORE
  83         select ARCH_INLINE_SPIN_LOCK
  84         select ARCH_INLINE_SPIN_LOCK_BH
  85         select ARCH_INLINE_SPIN_LOCK_IRQ
  86         select ARCH_INLINE_SPIN_LOCK_IRQSAVE
  87         select ARCH_INLINE_SPIN_TRYLOCK
  88         select ARCH_INLINE_SPIN_TRYLOCK_BH
  89         select ARCH_INLINE_SPIN_UNLOCK
  90         select ARCH_INLINE_SPIN_UNLOCK_BH
  91         select ARCH_INLINE_SPIN_UNLOCK_IRQ
  92         select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE
  93         select ARCH_INLINE_WRITE_LOCK
  94         select ARCH_INLINE_WRITE_LOCK_BH
  95         select ARCH_INLINE_WRITE_LOCK_IRQ
  96         select ARCH_INLINE_WRITE_LOCK_IRQSAVE
  97         select ARCH_INLINE_WRITE_TRYLOCK
  98         select ARCH_INLINE_WRITE_UNLOCK
  99         select ARCH_INLINE_WRITE_UNLOCK_BH
 100         select ARCH_INLINE_WRITE_UNLOCK_IRQ
 101         select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE
 102         select ARCH_SAVE_PAGE_KEYS if HIBERNATION
 103         select ARCH_SUPPORTS_ATOMIC_RMW
 104         select ARCH_SUPPORTS_NUMA_BALANCING
 105         select ARCH_USE_BUILTIN_BSWAP
 106         select ARCH_USE_CMPXCHG_LOCKREF
 107         select ARCH_WANTS_PROT_NUMA_PROT_NONE
 108         select ARCH_WANT_IPC_PARSE_VERSION
 109         select BUILDTIME_EXTABLE_SORT
 110         select CLONE_BACKWARDS2
 111         select DYNAMIC_FTRACE if FUNCTION_TRACER
 112         select GENERIC_CLOCKEVENTS
 113         select GENERIC_CPU_AUTOPROBE
 114         select GENERIC_CPU_DEVICES if !SMP
 115         select GENERIC_FIND_FIRST_BIT
 116         select GENERIC_SMP_IDLE_THREAD
 117         select GENERIC_TIME_VSYSCALL
 118         select HAVE_ALIGNED_STRUCT_PAGE if SLUB
 119         select HAVE_ARCH_AUDITSYSCALL
 120         select HAVE_ARCH_EARLY_PFN_TO_NID
 121         select HAVE_ARCH_JUMP_LABEL
 122         select HAVE_ARCH_SECCOMP_FILTER
 123         select HAVE_ARCH_SOFT_DIRTY
 124         select HAVE_ARCH_TRACEHOOK
 125         select HAVE_ARCH_TRANSPARENT_HUGEPAGE
 126         select HAVE_BPF_JIT if PACK_STACK && HAVE_MARCH_Z196_FEATURES
 127         select HAVE_CMPXCHG_DOUBLE
 128         select HAVE_CMPXCHG_LOCAL
 129         select HAVE_DEBUG_KMEMLEAK
 130         select HAVE_DMA_API_DEBUG
 131         select HAVE_DYNAMIC_FTRACE
 132         select HAVE_DYNAMIC_FTRACE_WITH_REGS
 133         select HAVE_FTRACE_MCOUNT_RECORD
 134         select HAVE_FUNCTION_GRAPH_TRACER
 135         select HAVE_FUNCTION_TRACER
 136         select HAVE_FUTEX_CMPXCHG if FUTEX
 137         select HAVE_KERNEL_BZIP2
 138         select HAVE_KERNEL_GZIP
 139         select HAVE_KERNEL_LZ4
 140         select HAVE_KERNEL_LZMA
 141         select HAVE_KERNEL_LZO
 142         select HAVE_KERNEL_XZ
 143         select HAVE_KPROBES
 144         select HAVE_KRETPROBES
 145         select HAVE_KVM
 146         select HAVE_LIVEPATCH
 147         select HAVE_MEMBLOCK
 148         select HAVE_MEMBLOCK_NODE_MAP
 149         select HAVE_MEMBLOCK_PHYS_MAP
 150         select HAVE_MOD_ARCH_SPECIFIC
 151         select HAVE_OPROFILE
 152         select HAVE_PERF_EVENTS
 153         select HAVE_REGS_AND_STACK_ACCESS_API
 154         select HAVE_SYSCALL_TRACEPOINTS
 155         select HAVE_VIRT_CPU_ACCOUNTING
 156         select MODULES_USE_ELF_RELA
 157         select NO_BOOTMEM
 158         select OLD_SIGACTION
 159         select OLD_SIGSUSPEND3
 160         select SYSCTL_EXCEPTION_TRACE
 161         select TTY
 162         select VIRT_CPU_ACCOUNTING
 163         select VIRT_TO_BUS
 164
 165
 166 config SCHED_OMIT_FRAME_POINTER
 167         def_bool y
 168
 169 config PGTABLE_LEVELS
 170         int
 171         default 4
 172
 173 source "init/Kconfig"
 174
 175 source "kernel/Kconfig.freezer"
 176
 177 source "kernel/livepatch/Kconfig"
 178
 179 menu "Processor type and features"
 180
 181 config HAVE_MARCH_Z900_FEATURES
 182         def_bool n
 183
 184 config HAVE_MARCH_Z990_FEATURES
 185         def_bool n
 186         select HAVE_MARCH_Z900_FEATURES
 187
 188 config HAVE_MARCH_Z9_109_FEATURES
 189         def_bool n
 190         select HAVE_MARCH_Z990_FEATURES
 191
 192 config HAVE_MARCH_Z10_FEATURES
 193         def_bool n
 194         select HAVE_MARCH_Z9_109_FEATURES
 195
 196 config HAVE_MARCH_Z196_FEATURES
 197         def_bool n
 198         select HAVE_MARCH_Z10_FEATURES
 199
 200 config HAVE_MARCH_ZEC12_FEATURES
 201         def_bool n
 202         select HAVE_MARCH_Z196_FEATURES
 203
 204 config HAVE_MARCH_Z13_FEATURES
 205         def_bool n
 206         select HAVE_MARCH_ZEC12_FEATURES
 207
 208 choice
 209         prompt "Processor type"
 210         default MARCH_Z900
 211
 212 config MARCH_Z900
 213         bool "IBM zSeries model z800 and z900"
 214         select HAVE_MARCH_Z900_FEATURES
 215         help
 216           Select this to enable optimizations for model z800/z900 (2064 and
 217           2066 series). This will enable some optimizations that are not
 218           available on older ESA/390 (31 Bit) only CPUs.
 219
 220 config MARCH_Z990
 221         bool "IBM zSeries model z890 and z990"
 222         select HAVE_MARCH_Z990_FEATURES
 223         help
 224           Select this to enable optimizations for model z890/z990 (2084 and
 225           2086 series). The kernel will be slightly faster but will not work
 226           on older machines.
 227
 228 config MARCH_Z9_109
 229         bool "IBM System z9"
 230         select HAVE_MARCH_Z9_109_FEATURES
 231         help
 232           Select this to enable optimizations for IBM System z9 (2094 and
 233           2096 series). The kernel will be slightly faster but will not work
 234           on older machines.
 235
 236 config MARCH_Z10
 237         bool "IBM System z10"
 238         select HAVE_MARCH_Z10_FEATURES
 239         help
 240           Select this to enable optimizations for IBM System z10 (2097 and
 241           2098 series). The kernel will be slightly faster but will not work
 242           on older machines.
 243
 244 config MARCH_Z196
 245         bool "IBM zEnterprise 114 and 196"
 246         select HAVE_MARCH_Z196_FEATURES
 247         help
 248           Select this to enable optimizations for IBM zEnterprise 114 and 196
 249           (2818 and 2817 series). The kernel will be slightly faster but will
 250           not work on older machines.
 251
 252 config MARCH_ZEC12
 253         bool "IBM zBC12 and zEC12"
 254         select HAVE_MARCH_ZEC12_FEATURES
 255         help
 256           Select this to enable optimizations for IBM zBC12 and zEC12 (2828 and
 257           2827 series). The kernel will be slightly faster but will not work on
 258           older machines.
 259
 260 config MARCH_Z13
 261         bool "IBM z13s and z13"
 262         select HAVE_MARCH_Z13_FEATURES
 263         help
 264           Select this to enable optimizations for IBM z13s and z13 (2965 and
 265           2964 series). The kernel will be slightly faster but will not work on
 266           older machines.
 267
 268 endchoice
 269
 270 config MARCH_Z900_TUNE
 271         def_bool TUNE_Z900 || MARCH_Z900 && TUNE_DEFAULT
 272
 273 config MARCH_Z990_TUNE
 274         def_bool TUNE_Z990 || MARCH_Z990 && TUNE_DEFAULT
 275
 276 config MARCH_Z9_109_TUNE
 277         def_bool TUNE_Z9_109 || MARCH_Z9_109 && TUNE_DEFAULT
 278
 279 config MARCH_Z10_TUNE
 280         def_bool TUNE_Z10 || MARCH_Z10 && TUNE_DEFAULT
 281
 282 config MARCH_Z196_TUNE
 283         def_bool TUNE_Z196 || MARCH_Z196 && TUNE_DEFAULT
 284
 285 config MARCH_ZEC12_TUNE
 286         def_bool TUNE_ZEC12 || MARCH_ZEC12 && TUNE_DEFAULT
 287
 288 config MARCH_Z13_TUNE
 289         def_bool TUNE_Z13 || MARCH_Z13 && TUNE_DEFAULT
 290
 291 choice
 292         prompt "Tune code generation"
 293         default TUNE_DEFAULT
 294         help
 295           Cause the compiler to tune (-mtune) the generated code for a machine.
 296           This will make the code run faster on the selected machine but
 297           somewhat slower on other machines.
 298           This option only changes how the compiler emits instructions, not the
 299           selection of instructions itself, so the resulting kernel will run on
 300           all other machines.
 301
 302 config TUNE_DEFAULT
 303         bool "Default"
 304         help
 305           Tune the generated code for the target processor for which the kernel
 306           will be compiled.
 307
 308 config TUNE_Z900
 309         bool "IBM zSeries model z800 and z900"
 310
 311 config TUNE_Z990
 312         bool "IBM zSeries model z890 and z990"
 313
 314 config TUNE_Z9_109
 315         bool "IBM System z9"
 316
 317 config TUNE_Z10
 318         bool "IBM System z10"
 319
 320 config TUNE_Z196
 321         bool "IBM zEnterprise 114 and 196"
 322
 323 config TUNE_ZEC12
 324         bool "IBM zBC12 and zEC12"
 325
 326 config TUNE_Z13
 327         bool "IBM z13"
 328
 329 endchoice
 330
 331 config 64BIT
 332         def_bool y
 333
 334 config COMPAT
 335         def_bool y
 336         prompt "Kernel support for 31 bit emulation"
 337         select COMPAT_BINFMT_ELF if BINFMT_ELF
 338         select ARCH_WANT_OLD_COMPAT_IPC
 339         select COMPAT_OLD_SIGACTION
 340         depends on MULTIUSER
 341         help
 342           Select this option if you want to enable your system kernel to
 343           handle system-calls from ELF binaries for 31 bit ESA.  This option
 344           (and some other stuff like libraries and such) is needed for
 345           executing 31 bit applications.  It is safe to say "Y".
 346
 347 config SYSVIPC_COMPAT
 348         def_bool y if COMPAT && SYSVIPC
 349
 350 config KEYS_COMPAT
 351         def_bool y if COMPAT && KEYS
 352
 353 config SMP
 354         def_bool y
 355         prompt "Symmetric multi-processing support"
 356         ---help---
 357           This enables support for systems with more than one CPU. If you have
 358           a system with only one CPU, like most personal computers, say N. If
 359           you have a system with more than one CPU, say Y.
 360
 361           If you say N here, the kernel will run on uni- and multiprocessor
 362           machines, but will use only one CPU of a multiprocessor machine. If
 363           you say Y here, the kernel will run on many, but not all,
 364           uniprocessor machines. On a uniprocessor machine, the kernel
 365           will run faster if you say N here.
 366
 367           See also the SMP-HOWTO available at
 368           <http://www.tldp.org/docs.html#howto>.
 369
 370           Even if you don't know what to do here, say Y.
 371
 372 config NR_CPUS
 373         int "Maximum number of CPUs (2-512)"
 374         range 2 512
 375         depends on SMP
 376         default "64"
 377         help
 378           This allows you to specify the maximum number of CPUs which this
 379           kernel will support. The maximum supported value is 512 and the
 380           minimum value which makes sense is 2.
 381
 382           This is purely to save memory - each supported CPU adds
 383           approximately sixteen kilobytes to the kernel image.
 384
 385 config HOTPLUG_CPU
 386         def_bool y
 387         prompt "Support for hot-pluggable CPUs"
 388         depends on SMP
 389         help
 390           Say Y here to be able to turn CPUs off and on. CPUs
 391           can be controlled through /sys/devices/system/cpu/cpu#.
 392           Say N if you want to disable CPU hotplug.
 393
 394 # Some NUMA nodes have memory ranges that span
 395 # other nodes.  Even though a pfn is valid and
 396 # between a node's start and end pfns, it may not
 397 # reside on that node.  See memmap_init_zone()
 398 # for details. <- They meant memory holes!
 399 config NODES_SPAN_OTHER_NODES
 400         def_bool NUMA
 401
 402 config NUMA
 403         bool "NUMA support"
 404         depends on SMP && SCHED_TOPOLOGY
 405         default n
 406         help
 407           Enable NUMA support
 408
 409           This option adds NUMA support to the kernel.
 410
 411           An operation mode can be selected by appending
 412           numa=<method> to the kernel command line.
 413
 414           The default behaviour is identical to appending numa=plain to
 415           the command line. This will create just one node with all
 416           available memory and all CPUs in it.
 417
 418 config NODES_SHIFT
 419         int "Maximum NUMA nodes (as a power of 2)"
 420         range 1 10
 421         depends on NUMA
 422         default "4"
 423         help
 424           Specify the maximum number of NUMA nodes available on the target
 425           system. Increases memory reserved to accommodate various tables.
 426
 427 menu "Select NUMA modes"
 428         depends on NUMA
 429
 430 config NUMA_EMU
 431         bool "NUMA emulation"
 432         default y
 433         help
 434           Numa emulation mode will split the available system memory into
 435           equal chunks which then are distributed over the configured number
 436           of nodes in a round-robin manner.
 437
 438           The number of fake nodes is limited by the number of available memory
 439           chunks (i.e. memory size / fake size) and the number of supported
 440           nodes in the kernel.
 441
 442           The CPUs are assigned to the nodes in a way that partially respects
 443           the original machine topology (if supported by the machine).
 444           Fair distribution of the CPUs is not guaranteed.
 445
 446 config EMU_SIZE
 447         hex "NUMA emulation memory chunk size"
 448         default 0x10000000
 449         range 0x400000 0x100000000
 450         depends on NUMA_EMU
 451         help
 452           Select the default size by which the memory is chopped and then
 453           assigned to emulated NUMA nodes.
 454
 455           This can be overridden by specifying
 456
 457           emu_size=<n>
 458
 459           on the kernel command line where also suffixes K, M, G, and T are
 460           supported.
 461
 462 endmenu
 463
 464 config SCHED_SMT
 465         def_bool n
 466
 467 config SCHED_MC
 468         def_bool n
 469
 470 config SCHED_BOOK
 471         def_bool n
 472
 473 config SCHED_TOPOLOGY
 474         def_bool y
 475         prompt "Topology scheduler support"
 476         depends on SMP
 477         select SCHED_SMT
 478         select SCHED_MC
 479         select SCHED_BOOK
 480         help
 481           Topology scheduler support improves the CPU scheduler's decision
 482           making when dealing with machines that have multi-threading,
 483           multiple cores or multiple books.
 484
 485 source kernel/Kconfig.preempt
 486
 487 source kernel/Kconfig.hz
 488
 489 endmenu
 490
 491 menu "Memory setup"
 492
 493 config ARCH_SPARSEMEM_ENABLE
 494         def_bool y
 495         select SPARSEMEM_VMEMMAP_ENABLE
 496         select SPARSEMEM_VMEMMAP
 497
 498 config ARCH_SPARSEMEM_DEFAULT
 499         def_bool y
 500
 501 config ARCH_SELECT_MEMORY_MODEL
 502         def_bool y
 503
 504 config ARCH_ENABLE_MEMORY_HOTPLUG
 505         def_bool y if SPARSEMEM
 506
 507 config ARCH_ENABLE_MEMORY_HOTREMOVE
 508         def_bool y
 509
 510 config ARCH_ENABLE_SPLIT_PMD_PTLOCK
 511         def_bool y
 512
 513 config FORCE_MAX_ZONEORDER
 514         int
 515         default "9"
 516
 517 source "mm/Kconfig"
 518
 519 config PACK_STACK
 520         def_bool y
 521         prompt "Pack kernel stack"
 522         help
 523           This option enables the compiler option -mkernel-backchain if it
 524           is available. If the option is available the compiler supports
 525           the new stack layout which dramatically reduces the minimum stack
 526           frame size. With an old compiler a non-leaf function needs a
 527           minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
 528           -mkernel-backchain the minimum size drops to 16 byte on 31 bit
 529           and 24 byte on 64 bit.
 530
 531           Say Y if you are unsure.
 532
 533 config CHECK_STACK
 534         def_bool y
 535         prompt "Detect kernel stack overflow"
 536         help
 537           This option enables the compiler option -mstack-guard and
 538           -mstack-size if they are available. If the compiler supports them
 539           it will emit additional code to each function prolog to trigger
 540           an illegal operation if the kernel stack is about to overflow.
 541
 542           Say N if you are unsure.
 543
 544 config STACK_GUARD
 545         int "Size of the guard area (128-1024)"
 546         range 128 1024
 547         depends on CHECK_STACK
 548         default "256"
 549         help
 550           This allows you to specify the size of the guard area at the lower
 551           end of the kernel stack. If the kernel stack points into the guard
 552           area on function entry an illegal operation is triggered. The size
 553           needs to be a power of 2. Please keep in mind that the size of an
 554           interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
 555           The minimum size for the stack guard should be 256 for 31 bit and
 556           512 for 64 bit.
 557
 558 config WARN_DYNAMIC_STACK
 559         def_bool n
 560         prompt "Emit compiler warnings for function with dynamic stack usage"
 561         help
 562           This option enables the compiler option -mwarn-dynamicstack. If the
 563           compiler supports this options generates warnings for functions
 564           that dynamically allocate stack space using alloca.
 565
 566           Say N if you are unsure.
 567
 568 endmenu
 569
 570 menu "I/O subsystem"
 571
 572 config QDIO
 573         def_tristate y
 574         prompt "QDIO support"
 575         ---help---
 576           This driver provides the Queued Direct I/O base support for
 577           IBM System z.
 578
 579           To compile this driver as a module, choose M here: the
 580           module will be called qdio.
 581
 582           If unsure, say Y.
 583
 584 menuconfig PCI
 585         bool "PCI support"
 586         select PCI_MSI
 587         select IOMMU_SUPPORT
 588         help
 589           Enable PCI support.
 590
 591 if PCI
 592
 593 config PCI_NR_FUNCTIONS
 594         int "Maximum number of PCI functions (1-4096)"
 595         range 1 4096
 596         default "64"
 597         help
 598           This allows you to specify the maximum number of PCI functions which
 599           this kernel will support.
 600
 601 config PCI_NR_MSI
 602         int "Maximum number of MSI interrupts (64-32768)"
 603         range 64 32768
 604         default "256"
 605         help
 606           This defines the number of virtual interrupts the kernel will
 607           provide for MSI interrupts. If you configure your system to have
 608           too few drivers will fail to allocate MSI interrupts for all
 609           PCI devices.
 610
 611 source "drivers/pci/Kconfig"
 612
 613 endif   # PCI
 614
 615 config PCI_DOMAINS
 616         def_bool PCI
 617
 618 config HAS_IOMEM
 619         def_bool PCI
 620
 621 config IOMMU_HELPER
 622         def_bool PCI
 623
 624 config NEED_SG_DMA_LENGTH
 625         def_bool PCI
 626
 627 config NEED_DMA_MAP_STATE
 628         def_bool PCI
 629
 630 config CHSC_SCH
 631         def_tristate m
 632         prompt "Support for CHSC subchannels"
 633         help
 634           This driver allows usage of CHSC subchannels. A CHSC subchannel
 635           is usually present on LPAR only.
 636           The driver creates a device /dev/chsc, which may be used to
 637           obtain I/O configuration information about the machine and
 638           to issue asynchronous chsc commands (DANGEROUS).
 639           You will usually only want to use this interface on a special
 640           LPAR designated for system management.
 641
 642           To compile this driver as a module, choose M here: the
 643           module will be called chsc_sch.
 644
 645           If unsure, say N.
 646
 647 config SCM_BUS
 648         def_bool y
 649         prompt "SCM bus driver"
 650         help
 651           Bus driver for Storage Class Memory.
 652
 653 config EADM_SCH
 654         def_tristate m
 655         prompt "Support for EADM subchannels"
 656         depends on SCM_BUS
 657         help
 658           This driver allows usage of EADM subchannels. EADM subchannels act
 659           as a communication vehicle for SCM increments.
 660
 661           To compile this driver as a module, choose M here: the
 662           module will be called eadm_sch.
 663
 664 endmenu
 665
 666 menu "Dump support"
 667
 668 config CRASH_DUMP
 669         bool "kernel crash dumps"
 670         depends on SMP
 671         select KEXEC
 672         help
 673           Generate crash dump after being started by kexec.
 674           Crash dump kernels are loaded in the main kernel with kexec-tools
 675           into a specially reserved region and then later executed after
 676           a crash by kdump/kexec.
 677           Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this.
 678           This option also enables s390 zfcpdump.
 679           See also <file:Documentation/s390/zfcpdump.txt>
 680
 681 endmenu
 682
 683 menu "Executable file formats / Emulations"
 684
 685 source "fs/Kconfig.binfmt"
 686
 687 config SECCOMP
 688         def_bool y
 689         prompt "Enable seccomp to safely compute untrusted bytecode"
 690         depends on PROC_FS
 691         help
 692           This kernel feature is useful for number crunching applications
 693           that may need to compute untrusted bytecode during their
 694           execution. By using pipes or other transports made available to
 695           the process as file descriptors supporting the read/write
 696           syscalls, it's possible to isolate those applications in
 697           their own address space using seccomp. Once seccomp is
 698           enabled via /proc/<pid>/seccomp, it cannot be disabled
 699           and the task is only allowed to execute a few safe syscalls
 700           defined by each seccomp mode.
 701
 702           If unsure, say Y.
 703
 704 endmenu
 705
 706 menu "Power Management"
 707
 708 config ARCH_HIBERNATION_POSSIBLE
 709         def_bool y
 710
 711 source "kernel/power/Kconfig"
 712
 713 endmenu
 714
 715 source "net/Kconfig"
 716
 717 config PCMCIA
 718         def_bool n
 719
 720 config CCW
 721         def_bool y
 722
 723 source "drivers/Kconfig"
 724
 725 source "fs/Kconfig"
 726
 727 source "arch/s390/Kconfig.debug"
 728
 729 source "security/Kconfig"
 730
 731 source "crypto/Kconfig"
 732
 733 source "lib/Kconfig"
 734
 735 menu "Virtualization"
 736
 737 config PFAULT
 738         def_bool y
 739         prompt "Pseudo page fault support"
 740         help
 741           Select this option, if you want to use PFAULT pseudo page fault
 742           handling under VM. If running native or in LPAR, this option
 743           has no effect. If your VM does not support PFAULT, PAGEEX
 744           pseudo page fault handling will be used.
 745           Note that VM 4.2 supports PFAULT but has a bug in its
 746           implementation that causes some problems.
 747           Everybody who wants to run Linux under VM != VM4.2 should select
 748           this option.
 749
 750 config SHARED_KERNEL
 751         bool "VM shared kernel support"
 752         depends on !JUMP_LABEL
 753         help
 754           Select this option, if you want to share the text segment of the
 755           Linux kernel between different VM guests. This reduces memory
 756           usage with lots of guests but greatly increases kernel size.
 757           Also if a kernel was IPL'ed from a shared segment the kexec system
 758           call will not work.
 759           You should only select this option if you know what you are
 760           doing and want to exploit this feature.
 761
 762 config CMM
 763         def_tristate n
 764         prompt "Cooperative memory management"
 765         help
 766           Select this option, if you want to enable the kernel interface
 767           to reduce the memory size of the system. This is accomplished
 768           by allocating pages of memory and put them "on hold". This only
 769           makes sense for a system running under VM where the unused pages
 770           will be reused by VM for other guest systems. The interface
 771           allows an external monitor to balance memory of many systems.
 772           Everybody who wants to run Linux under VM should select this
 773           option.
 774
 775 config CMM_IUCV
 776         def_bool y
 777         prompt "IUCV special message interface to cooperative memory management"
 778         depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
 779         help
 780           Select this option to enable the special message interface to
 781           the cooperative memory management.
 782
 783 config APPLDATA_BASE
 784         def_bool n
 785         prompt "Linux - VM Monitor Stream, base infrastructure"
 786         depends on PROC_FS
 787         help
 788           This provides a kernel interface for creating and updating z/VM APPLDATA
 789           monitor records. The monitor records are updated at certain time
 790           intervals, once the timer is started.
 791           Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
 792           i.e. enables or disables monitoring on the Linux side.
 793           A custom interval value (in seconds) can be written to
 794           /proc/appldata/interval.
 795
 796           Defaults are 60 seconds interval and timer off.
 797           The /proc entries can also be read from, showing the current settings.
 798
 799 config APPLDATA_MEM
 800         def_tristate m
 801         prompt "Monitor memory management statistics"
 802         depends on APPLDATA_BASE && VM_EVENT_COUNTERS
 803         help
 804           This provides memory management related data to the Linux - VM Monitor
 805           Stream, like paging/swapping rate, memory utilisation, etc.
 806           Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
 807           APPLDATA monitor record, i.e. enables or disables monitoring this record
 808           on the z/VM side.
 809
 810           Default is disabled.
 811           The /proc entry can also be read from, showing the current settings.
 812
 813           This can also be compiled as a module, which will be called
 814           appldata_mem.o.
 815
 816 config APPLDATA_OS
 817         def_tristate m
 818         prompt "Monitor OS statistics"
 819         depends on APPLDATA_BASE
 820         help
 821           This provides OS related data to the Linux - VM Monitor Stream, like
 822           CPU utilisation, etc.
 823           Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
 824           APPLDATA monitor record, i.e. enables or disables monitoring this record
 825           on the z/VM side.
 826
 827           Default is disabled.
 828           This can also be compiled as a module, which will be called
 829           appldata_os.o.
 830
 831 config APPLDATA_NET_SUM
 832         def_tristate m
 833         prompt "Monitor overall network statistics"
 834         depends on APPLDATA_BASE && NET
 835         help
 836           This provides network related data to the Linux - VM Monitor Stream,
 837           currently there is only a total sum of network I/O statistics, no
 838           per-interface data.
 839           Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
 840           APPLDATA monitor record, i.e. enables or disables monitoring this record
 841           on the z/VM side.
 842
 843           Default is disabled.
 844           This can also be compiled as a module, which will be called
 845           appldata_net_sum.o.
 846
 847 config S390_HYPFS_FS
 848         def_bool y
 849         prompt "s390 hypervisor file system support"
 850         select SYS_HYPERVISOR
 851         help
 852           This is a virtual file system intended to provide accounting
 853           information in an s390 hypervisor environment.
 854
 855 source "arch/s390/kvm/Kconfig"
 856
 857 config S390_GUEST
 858         def_bool y
 859         prompt "s390 support for virtio devices"
 860         select TTY
 861         select VIRTUALIZATION
 862         select VIRTIO
 863         select VIRTIO_CONSOLE
 864         help
 865           Enabling this option adds support for virtio based paravirtual device
 866           drivers on s390.
 867
 868           Select this option if you want to run the kernel as a guest under
 869           the KVM hypervisor.
 870
 871 endmenu