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         select KEXEC_CORE
  52
  53 config AUDIT_ARCH
  54         def_bool y
  55
  56 config NO_IOPORT_MAP
  57         def_bool y
  58
  59 config PCI_QUIRKS
  60         def_bool n
  61
  62 config ARCH_SUPPORTS_UPROBES
  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_ELF_RANDOMIZE
  70         select ARCH_HAS_GCOV_PROFILE_ALL
  71         select ARCH_HAS_SG_CHAIN
  72         select ARCH_HAVE_NMI_SAFE_CMPXCHG
  73         select ARCH_INLINE_READ_LOCK
  74         select ARCH_INLINE_READ_LOCK_BH
  75         select ARCH_INLINE_READ_LOCK_IRQ
  76         select ARCH_INLINE_READ_LOCK_IRQSAVE
  77         select ARCH_INLINE_READ_TRYLOCK
  78         select ARCH_INLINE_READ_UNLOCK
  79         select ARCH_INLINE_READ_UNLOCK_BH
  80         select ARCH_INLINE_READ_UNLOCK_IRQ
  81         select ARCH_INLINE_READ_UNLOCK_IRQRESTORE
  82         select ARCH_INLINE_SPIN_LOCK
  83         select ARCH_INLINE_SPIN_LOCK_BH
  84         select ARCH_INLINE_SPIN_LOCK_IRQ
  85         select ARCH_INLINE_SPIN_LOCK_IRQSAVE
  86         select ARCH_INLINE_SPIN_TRYLOCK
  87         select ARCH_INLINE_SPIN_TRYLOCK_BH
  88         select ARCH_INLINE_SPIN_UNLOCK
  89         select ARCH_INLINE_SPIN_UNLOCK_BH
  90         select ARCH_INLINE_SPIN_UNLOCK_IRQ
  91         select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE
  92         select ARCH_INLINE_WRITE_LOCK
  93         select ARCH_INLINE_WRITE_LOCK_BH
  94         select ARCH_INLINE_WRITE_LOCK_IRQ
  95         select ARCH_INLINE_WRITE_LOCK_IRQSAVE
  96         select ARCH_INLINE_WRITE_TRYLOCK
  97         select ARCH_INLINE_WRITE_UNLOCK
  98         select ARCH_INLINE_WRITE_UNLOCK_BH
  99         select ARCH_INLINE_WRITE_UNLOCK_IRQ
 100         select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE
 101         select ARCH_SAVE_PAGE_KEYS if HIBERNATION
 102         select ARCH_SUPPORTS_ATOMIC_RMW
 103         select ARCH_SUPPORTS_NUMA_BALANCING
 104         select ARCH_USE_CMPXCHG_LOCKREF
 105         select ARCH_WANTS_PROT_NUMA_PROT_NONE
 106         select ARCH_WANT_IPC_PARSE_VERSION
 107         select BUILDTIME_EXTABLE_SORT
 108         select CLONE_BACKWARDS2
 109         select DYNAMIC_FTRACE if FUNCTION_TRACER
 110         select GENERIC_CLOCKEVENTS
 111         select GENERIC_CPU_AUTOPROBE
 112         select GENERIC_CPU_DEVICES if !SMP
 113         select GENERIC_FIND_FIRST_BIT
 114         select GENERIC_SMP_IDLE_THREAD
 115         select GENERIC_TIME_VSYSCALL
 116         select HAVE_ALIGNED_STRUCT_PAGE if SLUB
 117         select HAVE_ARCH_AUDITSYSCALL
 118         select HAVE_ARCH_EARLY_PFN_TO_NID
 119         select HAVE_ARCH_JUMP_LABEL
 120         select HAVE_ARCH_SECCOMP_FILTER
 121         select HAVE_ARCH_TRACEHOOK
 122         select HAVE_ARCH_TRANSPARENT_HUGEPAGE
 123         select HAVE_BPF_JIT if PACK_STACK && HAVE_MARCH_Z196_FEATURES
 124         select HAVE_CMPXCHG_DOUBLE
 125         select HAVE_CMPXCHG_LOCAL
 126         select HAVE_DEBUG_KMEMLEAK
 127         select HAVE_DYNAMIC_FTRACE
 128         select HAVE_DYNAMIC_FTRACE_WITH_REGS
 129         select HAVE_FTRACE_MCOUNT_RECORD
 130         select HAVE_FUNCTION_GRAPH_TRACER
 131         select HAVE_FUNCTION_TRACER
 132         select HAVE_FUTEX_CMPXCHG if FUTEX
 133         select HAVE_KERNEL_BZIP2
 134         select HAVE_KERNEL_GZIP
 135         select HAVE_KERNEL_LZ4
 136         select HAVE_KERNEL_LZMA
 137         select HAVE_KERNEL_LZO
 138         select HAVE_KERNEL_XZ
 139         select HAVE_KPROBES
 140         select HAVE_KRETPROBES
 141         select HAVE_KVM
 142         select HAVE_LIVEPATCH
 143         select HAVE_MEMBLOCK
 144         select HAVE_MEMBLOCK_NODE_MAP
 145         select HAVE_MEMBLOCK_PHYS_MAP
 146         select HAVE_MOD_ARCH_SPECIFIC
 147         select HAVE_OPROFILE
 148         select HAVE_PERF_EVENTS
 149         select HAVE_REGS_AND_STACK_ACCESS_API
 150         select HAVE_SYSCALL_TRACEPOINTS
 151         select HAVE_VIRT_CPU_ACCOUNTING
 152         select MODULES_USE_ELF_RELA
 153         select NO_BOOTMEM
 154         select OLD_SIGACTION
 155         select OLD_SIGSUSPEND3
 156         select SYSCTL_EXCEPTION_TRACE
 157         select TTY
 158         select VIRT_CPU_ACCOUNTING
 159         select VIRT_TO_BUS
 160
 161
 162 config SCHED_OMIT_FRAME_POINTER
 163         def_bool y
 164
 165 config PGTABLE_LEVELS
 166         int
 167         default 4 if 64BIT
 168         default 2
 169
 170 source "init/Kconfig"
 171
 172 source "kernel/Kconfig.freezer"
 173
 174 source "kernel/livepatch/Kconfig"
 175
 176 menu "Processor type and features"
 177
 178 config HAVE_MARCH_Z900_FEATURES
 179         def_bool n
 180
 181 config HAVE_MARCH_Z990_FEATURES
 182         def_bool n
 183         select HAVE_MARCH_Z900_FEATURES
 184
 185 config HAVE_MARCH_Z9_109_FEATURES
 186         def_bool n
 187         select HAVE_MARCH_Z990_FEATURES
 188
 189 config HAVE_MARCH_Z10_FEATURES
 190         def_bool n
 191         select HAVE_MARCH_Z9_109_FEATURES
 192
 193 config HAVE_MARCH_Z196_FEATURES
 194         def_bool n
 195         select HAVE_MARCH_Z10_FEATURES
 196
 197 config HAVE_MARCH_ZEC12_FEATURES
 198         def_bool n
 199         select HAVE_MARCH_Z196_FEATURES
 200
 201 config HAVE_MARCH_Z13_FEATURES
 202         def_bool n
 203         select HAVE_MARCH_ZEC12_FEATURES
 204
 205 choice
 206         prompt "Processor type"
 207         default MARCH_Z900
 208
 209 config MARCH_Z900
 210         bool "IBM zSeries model z800 and z900"
 211         select HAVE_MARCH_Z900_FEATURES
 212         help
 213           Select this to enable optimizations for model z800/z900 (2064 and
 214           2066 series). This will enable some optimizations that are not
 215           available on older ESA/390 (31 Bit) only CPUs.
 216
 217 config MARCH_Z990
 218         bool "IBM zSeries model z890 and z990"
 219         select HAVE_MARCH_Z990_FEATURES
 220         help
 221           Select this to enable optimizations for model z890/z990 (2084 and
 222           2086 series). The kernel will be slightly faster but will not work
 223           on older machines.
 224
 225 config MARCH_Z9_109
 226         bool "IBM System z9"
 227         select HAVE_MARCH_Z9_109_FEATURES
 228         help
 229           Select this to enable optimizations for IBM System z9 (2094 and
 230           2096 series). The kernel will be slightly faster but will not work
 231           on older machines.
 232
 233 config MARCH_Z10
 234         bool "IBM System z10"
 235         select HAVE_MARCH_Z10_FEATURES
 236         help
 237           Select this to enable optimizations for IBM System z10 (2097 and
 238           2098 series). The kernel will be slightly faster but will not work
 239           on older machines.
 240
 241 config MARCH_Z196
 242         bool "IBM zEnterprise 114 and 196"
 243         select HAVE_MARCH_Z196_FEATURES
 244         help
 245           Select this to enable optimizations for IBM zEnterprise 114 and 196
 246           (2818 and 2817 series). The kernel will be slightly faster but will
 247           not work on older machines.
 248
 249 config MARCH_ZEC12
 250         bool "IBM zBC12 and zEC12"
 251         select HAVE_MARCH_ZEC12_FEATURES
 252         help
 253           Select this to enable optimizations for IBM zBC12 and zEC12 (2828 and
 254           2827 series). The kernel will be slightly faster but will not work on
 255           older machines.
 256
 257 config MARCH_Z13
 258         bool "IBM z13"
 259         select HAVE_MARCH_Z13_FEATURES
 260         help
 261           Select this to enable optimizations for IBM z13 (2964 series).
 262           The kernel will be slightly faster but will not work on older
 263           machines.
 264
 265 endchoice
 266
 267 config MARCH_Z900_TUNE
 268         def_bool TUNE_Z900 || MARCH_Z900 && TUNE_DEFAULT
 269
 270 config MARCH_Z990_TUNE
 271         def_bool TUNE_Z990 || MARCH_Z990 && TUNE_DEFAULT
 272
 273 config MARCH_Z9_109_TUNE
 274         def_bool TUNE_Z9_109 || MARCH_Z9_109 && TUNE_DEFAULT
 275
 276 config MARCH_Z10_TUNE
 277         def_bool TUNE_Z10 || MARCH_Z10 && TUNE_DEFAULT
 278
 279 config MARCH_Z196_TUNE
 280         def_bool TUNE_Z196 || MARCH_Z196 && TUNE_DEFAULT
 281
 282 config MARCH_ZEC12_TUNE
 283         def_bool TUNE_ZEC12 || MARCH_ZEC12 && TUNE_DEFAULT
 284
 285 config MARCH_Z13_TUNE
 286         def_bool TUNE_Z13 || MARCH_Z13 && TUNE_DEFAULT
 287
 288 choice
 289         prompt "Tune code generation"
 290         default TUNE_DEFAULT
 291         help
 292           Cause the compiler to tune (-mtune) the generated code for a machine.
 293           This will make the code run faster on the selected machine but
 294           somewhat slower on other machines.
 295           This option only changes how the compiler emits instructions, not the
 296           selection of instructions itself, so the resulting kernel will run on
 297           all other machines.
 298
 299 config TUNE_DEFAULT
 300         bool "Default"
 301         help
 302           Tune the generated code for the target processor for which the kernel
 303           will be compiled.
 304
 305 config TUNE_Z900
 306         bool "IBM zSeries model z800 and z900"
 307
 308 config TUNE_Z990
 309         bool "IBM zSeries model z890 and z990"
 310
 311 config TUNE_Z9_109
 312         bool "IBM System z9"
 313
 314 config TUNE_Z10
 315         bool "IBM System z10"
 316
 317 config TUNE_Z196
 318         bool "IBM zEnterprise 114 and 196"
 319
 320 config TUNE_ZEC12
 321         bool "IBM zBC12 and zEC12"
 322
 323 config TUNE_Z13
 324         bool "IBM z13"
 325
 326 endchoice
 327
 328 config 64BIT
 329         def_bool y
 330
 331 config COMPAT
 332         def_bool y
 333         prompt "Kernel support for 31 bit emulation"
 334         select COMPAT_BINFMT_ELF if BINFMT_ELF
 335         select ARCH_WANT_OLD_COMPAT_IPC
 336         select COMPAT_OLD_SIGACTION
 337         depends on MULTIUSER
 338         help
 339           Select this option if you want to enable your system kernel to
 340           handle system-calls from ELF binaries for 31 bit ESA.  This option
 341           (and some other stuff like libraries and such) is needed for
 342           executing 31 bit applications.  It is safe to say "Y".
 343
 344 config SYSVIPC_COMPAT
 345         def_bool y if COMPAT && SYSVIPC
 346
 347 config KEYS_COMPAT
 348         def_bool y if COMPAT && KEYS
 349
 350 config SMP
 351         def_bool y
 352         prompt "Symmetric multi-processing support"
 353         ---help---
 354           This enables support for systems with more than one CPU. If you have
 355           a system with only one CPU, like most personal computers, say N. If
 356           you have a system with more than one CPU, say Y.
 357
 358           If you say N here, the kernel will run on uni- and multiprocessor
 359           machines, but will use only one CPU of a multiprocessor machine. If
 360           you say Y here, the kernel will run on many, but not all,
 361           uniprocessor machines. On a uniprocessor machine, the kernel
 362           will run faster if you say N here.
 363
 364           See also the SMP-HOWTO available at
 365           <http://www.tldp.org/docs.html#howto>.
 366
 367           Even if you don't know what to do here, say Y.
 368
 369 config NR_CPUS
 370         int "Maximum number of CPUs (2-512)"
 371         range 2 512
 372         depends on SMP
 373         default "64"
 374         help
 375           This allows you to specify the maximum number of CPUs which this
 376           kernel will support. The maximum supported value is 512 and the
 377           minimum value which makes sense is 2.
 378
 379           This is purely to save memory - each supported CPU adds
 380           approximately sixteen kilobytes to the kernel image.
 381
 382 config HOTPLUG_CPU
 383         def_bool y
 384         prompt "Support for hot-pluggable CPUs"
 385         depends on SMP
 386         help
 387           Say Y here to be able to turn CPUs off and on. CPUs
 388           can be controlled through /sys/devices/system/cpu/cpu#.
 389           Say N if you want to disable CPU hotplug.
 390
 391 config SCHED_SMT
 392         def_bool n
 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 && 64BIT && 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_MC
 465         def_bool n
 466
 467 config SCHED_BOOK
 468         def_bool n
 469
 470 config SCHED_TOPOLOGY
 471         def_bool y
 472         prompt "Topology scheduler support"
 473         depends on SMP
 474         select SCHED_SMT
 475         select SCHED_MC
 476         select SCHED_BOOK
 477         help
 478           Topology scheduler support improves the CPU scheduler's decision
 479           making when dealing with machines that have multi-threading,
 480           multiple cores or multiple books.
 481
 482 source kernel/Kconfig.preempt
 483
 484 source kernel/Kconfig.hz
 485
 486 endmenu
 487
 488 menu "Memory setup"
 489
 490 config ARCH_SPARSEMEM_ENABLE
 491         def_bool y
 492         select SPARSEMEM_VMEMMAP_ENABLE
 493         select SPARSEMEM_VMEMMAP
 494
 495 config ARCH_SPARSEMEM_DEFAULT
 496         def_bool y
 497
 498 config ARCH_SELECT_MEMORY_MODEL
 499         def_bool y
 500
 501 config ARCH_ENABLE_MEMORY_HOTPLUG
 502         def_bool y if SPARSEMEM
 503
 504 config ARCH_ENABLE_MEMORY_HOTREMOVE
 505         def_bool y
 506
 507 config ARCH_ENABLE_SPLIT_PMD_PTLOCK
 508         def_bool y
 509
 510 config FORCE_MAX_ZONEORDER
 511         int
 512         default "9"
 513
 514 source "mm/Kconfig"
 515
 516 config PACK_STACK
 517         def_bool y
 518         prompt "Pack kernel stack"
 519         help
 520           This option enables the compiler option -mkernel-backchain if it
 521           is available. If the option is available the compiler supports
 522           the new stack layout which dramatically reduces the minimum stack
 523           frame size. With an old compiler a non-leaf function needs a
 524           minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
 525           -mkernel-backchain the minimum size drops to 16 byte on 31 bit
 526           and 24 byte on 64 bit.
 527
 528           Say Y if you are unsure.
 529
 530 config CHECK_STACK
 531         def_bool y
 532         prompt "Detect kernel stack overflow"
 533         help
 534           This option enables the compiler option -mstack-guard and
 535           -mstack-size if they are available. If the compiler supports them
 536           it will emit additional code to each function prolog to trigger
 537           an illegal operation if the kernel stack is about to overflow.
 538
 539           Say N if you are unsure.
 540
 541 config STACK_GUARD
 542         int "Size of the guard area (128-1024)"
 543         range 128 1024
 544         depends on CHECK_STACK
 545         default "256"
 546         help
 547           This allows you to specify the size of the guard area at the lower
 548           end of the kernel stack. If the kernel stack points into the guard
 549           area on function entry an illegal operation is triggered. The size
 550           needs to be a power of 2. Please keep in mind that the size of an
 551           interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
 552           The minimum size for the stack guard should be 256 for 31 bit and
 553           512 for 64 bit.
 554
 555 config WARN_DYNAMIC_STACK
 556         def_bool n
 557         prompt "Emit compiler warnings for function with dynamic stack usage"
 558         help
 559           This option enables the compiler option -mwarn-dynamicstack. If the
 560           compiler supports this options generates warnings for functions
 561           that dynamically allocate stack space using alloca.
 562
 563           Say N if you are unsure.
 564
 565 endmenu
 566
 567 menu "I/O subsystem"
 568
 569 config QDIO
 570         def_tristate y
 571         prompt "QDIO support"
 572         ---help---
 573           This driver provides the Queued Direct I/O base support for
 574           IBM System z.
 575
 576           To compile this driver as a module, choose M here: the
 577           module will be called qdio.
 578
 579           If unsure, say Y.
 580
 581 menuconfig PCI
 582         bool "PCI support"
 583         select HAVE_DMA_ATTRS
 584         select PCI_MSI
 585         help
 586           Enable PCI support.
 587
 588 if PCI
 589
 590 config PCI_NR_FUNCTIONS
 591         int "Maximum number of PCI functions (1-4096)"
 592         range 1 4096
 593         default "64"
 594         help
 595           This allows you to specify the maximum number of PCI functions which
 596           this kernel will support.
 597
 598 config PCI_NR_MSI
 599         int "Maximum number of MSI interrupts (64-32768)"
 600         range 64 32768
 601         default "256"
 602         help
 603           This defines the number of virtual interrupts the kernel will
 604           provide for MSI interrupts. If you configure your system to have
 605           too few drivers will fail to allocate MSI interrupts for all
 606           PCI devices.
 607
 608 source "drivers/pci/Kconfig"
 609 source "drivers/pci/pcie/Kconfig"
 610 source "drivers/pci/hotplug/Kconfig"
 611
 612 endif   # PCI
 613
 614 config PCI_DOMAINS
 615         def_bool PCI
 616
 617 config HAS_IOMEM
 618         def_bool PCI
 619
 620 config IOMMU_HELPER
 621         def_bool PCI
 622
 623 config HAS_DMA
 624         def_bool PCI
 625         select HAVE_DMA_API_DEBUG
 626
 627 config NEED_SG_DMA_LENGTH
 628         def_bool PCI
 629
 630 config NEED_DMA_MAP_STATE
 631         def_bool PCI
 632
 633 config CHSC_SCH
 634         def_tristate m
 635         prompt "Support for CHSC subchannels"
 636         help
 637           This driver allows usage of CHSC subchannels. A CHSC subchannel
 638           is usually present on LPAR only.
 639           The driver creates a device /dev/chsc, which may be used to
 640           obtain I/O configuration information about the machine and
 641           to issue asynchronous chsc commands (DANGEROUS).
 642           You will usually only want to use this interface on a special
 643           LPAR designated for system management.
 644
 645           To compile this driver as a module, choose M here: the
 646           module will be called chsc_sch.
 647
 648           If unsure, say N.
 649
 650 config SCM_BUS
 651         def_bool y
 652         prompt "SCM bus driver"
 653         help
 654           Bus driver for Storage Class Memory.
 655
 656 config EADM_SCH
 657         def_tristate m
 658         prompt "Support for EADM subchannels"
 659         depends on SCM_BUS
 660         help
 661           This driver allows usage of EADM subchannels. EADM subchannels act
 662           as a communication vehicle for SCM increments.
 663
 664           To compile this driver as a module, choose M here: the
 665           module will be called eadm_sch.
 666
 667 endmenu
 668
 669 menu "Dump support"
 670
 671 config CRASH_DUMP
 672         bool "kernel crash dumps"
 673         depends on SMP
 674         select KEXEC
 675         help
 676           Generate crash dump after being started by kexec.
 677           Crash dump kernels are loaded in the main kernel with kexec-tools
 678           into a specially reserved region and then later executed after
 679           a crash by kdump/kexec.
 680           Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this.
 681           This option also enables s390 zfcpdump.
 682           See also <file:Documentation/s390/zfcpdump.txt>
 683
 684 endmenu
 685
 686 menu "Executable file formats / Emulations"
 687
 688 source "fs/Kconfig.binfmt"
 689
 690 config SECCOMP
 691         def_bool y
 692         prompt "Enable seccomp to safely compute untrusted bytecode"
 693         depends on PROC_FS
 694         help
 695           This kernel feature is useful for number crunching applications
 696           that may need to compute untrusted bytecode during their
 697           execution. By using pipes or other transports made available to
 698           the process as file descriptors supporting the read/write
 699           syscalls, it's possible to isolate those applications in
 700           their own address space using seccomp. Once seccomp is
 701           enabled via /proc/<pid>/seccomp, it cannot be disabled
 702           and the task is only allowed to execute a few safe syscalls
 703           defined by each seccomp mode.
 704
 705           If unsure, say Y.
 706
 707 endmenu
 708
 709 menu "Power Management"
 710
 711 config ARCH_HIBERNATION_POSSIBLE
 712         def_bool y
 713
 714 source "kernel/power/Kconfig"
 715
 716 endmenu
 717
 718 source "net/Kconfig"
 719
 720 config PCMCIA
 721         def_bool n
 722
 723 config CCW
 724         def_bool y
 725
 726 source "drivers/Kconfig"
 727
 728 source "fs/Kconfig"
 729
 730 source "arch/s390/Kconfig.debug"
 731
 732 source "security/Kconfig"
 733
 734 source "crypto/Kconfig"
 735
 736 source "lib/Kconfig"
 737
 738 menu "Virtualization"
 739
 740 config PFAULT
 741         def_bool y
 742         prompt "Pseudo page fault support"
 743         help
 744           Select this option, if you want to use PFAULT pseudo page fault
 745           handling under VM. If running native or in LPAR, this option
 746           has no effect. If your VM does not support PFAULT, PAGEEX
 747           pseudo page fault handling will be used.
 748           Note that VM 4.2 supports PFAULT but has a bug in its
 749           implementation that causes some problems.
 750           Everybody who wants to run Linux under VM != VM4.2 should select
 751           this option.
 752
 753 config SHARED_KERNEL
 754         bool "VM shared kernel support"
 755         depends on !JUMP_LABEL
 756         help
 757           Select this option, if you want to share the text segment of the
 758           Linux kernel between different VM guests. This reduces memory
 759           usage with lots of guests but greatly increases kernel size.
 760           Also if a kernel was IPL'ed from a shared segment the kexec system
 761           call will not work.
 762           You should only select this option if you know what you are
 763           doing and want to exploit this feature.
 764
 765 config CMM
 766         def_tristate n
 767         prompt "Cooperative memory management"
 768         help
 769           Select this option, if you want to enable the kernel interface
 770           to reduce the memory size of the system. This is accomplished
 771           by allocating pages of memory and put them "on hold". This only
 772           makes sense for a system running under VM where the unused pages
 773           will be reused by VM for other guest systems. The interface
 774           allows an external monitor to balance memory of many systems.
 775           Everybody who wants to run Linux under VM should select this
 776           option.
 777
 778 config CMM_IUCV
 779         def_bool y
 780         prompt "IUCV special message interface to cooperative memory management"
 781         depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
 782         help
 783           Select this option to enable the special message interface to
 784           the cooperative memory management.
 785
 786 config APPLDATA_BASE
 787         def_bool n
 788         prompt "Linux - VM Monitor Stream, base infrastructure"
 789         depends on PROC_FS
 790         help
 791           This provides a kernel interface for creating and updating z/VM APPLDATA
 792           monitor records. The monitor records are updated at certain time
 793           intervals, once the timer is started.
 794           Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
 795           i.e. enables or disables monitoring on the Linux side.
 796           A custom interval value (in seconds) can be written to
 797           /proc/appldata/interval.
 798
 799           Defaults are 60 seconds interval and timer off.
 800           The /proc entries can also be read from, showing the current settings.
 801
 802 config APPLDATA_MEM
 803         def_tristate m
 804         prompt "Monitor memory management statistics"
 805         depends on APPLDATA_BASE && VM_EVENT_COUNTERS
 806         help
 807           This provides memory management related data to the Linux - VM Monitor
 808           Stream, like paging/swapping rate, memory utilisation, etc.
 809           Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
 810           APPLDATA monitor record, i.e. enables or disables monitoring this record
 811           on the z/VM side.
 812
 813           Default is disabled.
 814           The /proc entry can also be read from, showing the current settings.
 815
 816           This can also be compiled as a module, which will be called
 817           appldata_mem.o.
 818
 819 config APPLDATA_OS
 820         def_tristate m
 821         prompt "Monitor OS statistics"
 822         depends on APPLDATA_BASE
 823         help
 824           This provides OS related data to the Linux - VM Monitor Stream, like
 825           CPU utilisation, etc.
 826           Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
 827           APPLDATA monitor record, i.e. enables or disables monitoring this record
 828           on the z/VM side.
 829
 830           Default is disabled.
 831           This can also be compiled as a module, which will be called
 832           appldata_os.o.
 833
 834 config APPLDATA_NET_SUM
 835         def_tristate m
 836         prompt "Monitor overall network statistics"
 837         depends on APPLDATA_BASE && NET
 838         help
 839           This provides network related data to the Linux - VM Monitor Stream,
 840           currently there is only a total sum of network I/O statistics, no
 841           per-interface data.
 842           Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
 843           APPLDATA monitor record, i.e. enables or disables monitoring this record
 844           on the z/VM side.
 845
 846           Default is disabled.
 847           This can also be compiled as a module, which will be called
 848           appldata_net_sum.o.
 849
 850 config S390_HYPFS_FS
 851         def_bool y
 852         prompt "s390 hypervisor file system support"
 853         select SYS_HYPERVISOR
 854         help
 855           This is a virtual file system intended to provide accounting
 856           information in an s390 hypervisor environment.
 857
 858 source "arch/s390/kvm/Kconfig"
 859
 860 config S390_GUEST
 861         def_bool y
 862         prompt "s390 support for virtio devices"
 863         select TTY
 864         select VIRTUALIZATION
 865         select VIRTIO
 866         select VIRTIO_CONSOLE
 867         help
 868           Enabling this option adds support for virtio based paravirtual device
 869           drivers on s390.
 870
 871           Select this option if you want to run the kernel as a guest under
 872           the KVM hypervisor.
 873
 874 endmenu