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 S390
  63         def_bool y
  64         select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
  65         select ARCH_HAS_DEBUG_STRICT_USER_COPY_CHECKS
  66         select ARCH_HAS_DEVMEM_IS_ALLOWED
  67         select ARCH_HAS_ELF_RANDOMIZE
  68         select ARCH_HAS_GCOV_PROFILE_ALL
  69         select ARCH_HAS_SG_CHAIN
  70         select ARCH_HAVE_NMI_SAFE_CMPXCHG
  71         select ARCH_INLINE_READ_LOCK
  72         select ARCH_INLINE_READ_LOCK_BH
  73         select ARCH_INLINE_READ_LOCK_IRQ
  74         select ARCH_INLINE_READ_LOCK_IRQSAVE
  75         select ARCH_INLINE_READ_TRYLOCK
  76         select ARCH_INLINE_READ_UNLOCK
  77         select ARCH_INLINE_READ_UNLOCK_BH
  78         select ARCH_INLINE_READ_UNLOCK_IRQ
  79         select ARCH_INLINE_READ_UNLOCK_IRQRESTORE
  80         select ARCH_INLINE_SPIN_LOCK
  81         select ARCH_INLINE_SPIN_LOCK_BH
  82         select ARCH_INLINE_SPIN_LOCK_IRQ
  83         select ARCH_INLINE_SPIN_LOCK_IRQSAVE
  84         select ARCH_INLINE_SPIN_TRYLOCK
  85         select ARCH_INLINE_SPIN_TRYLOCK_BH
  86         select ARCH_INLINE_SPIN_UNLOCK
  87         select ARCH_INLINE_SPIN_UNLOCK_BH
  88         select ARCH_INLINE_SPIN_UNLOCK_IRQ
  89         select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE
  90         select ARCH_INLINE_WRITE_LOCK
  91         select ARCH_INLINE_WRITE_LOCK_BH
  92         select ARCH_INLINE_WRITE_LOCK_IRQ
  93         select ARCH_INLINE_WRITE_LOCK_IRQSAVE
  94         select ARCH_INLINE_WRITE_TRYLOCK
  95         select ARCH_INLINE_WRITE_UNLOCK
  96         select ARCH_INLINE_WRITE_UNLOCK_BH
  97         select ARCH_INLINE_WRITE_UNLOCK_IRQ
  98         select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE
  99         select ARCH_SAVE_PAGE_KEYS if HIBERNATION
 100         select ARCH_SUPPORTS_ATOMIC_RMW
 101         select ARCH_SUPPORTS_NUMA_BALANCING
 102         select ARCH_USE_BUILTIN_BSWAP
 103         select ARCH_USE_CMPXCHG_LOCKREF
 104         select ARCH_WANTS_PROT_NUMA_PROT_NONE
 105         select ARCH_WANT_IPC_PARSE_VERSION
 106         select BUILDTIME_EXTABLE_SORT
 107         select CLONE_BACKWARDS2
 108         select DYNAMIC_FTRACE if FUNCTION_TRACER
 109         select GENERIC_CLOCKEVENTS
 110         select GENERIC_CPU_AUTOPROBE
 111         select GENERIC_CPU_DEVICES if !SMP
 112         select GENERIC_FIND_FIRST_BIT
 113         select GENERIC_SMP_IDLE_THREAD
 114         select GENERIC_TIME_VSYSCALL
 115         select HAVE_ALIGNED_STRUCT_PAGE if SLUB
 116         select HAVE_ARCH_AUDITSYSCALL
 117         select HAVE_ARCH_EARLY_PFN_TO_NID
 118         select HAVE_ARCH_JUMP_LABEL
 119         select HAVE_ARCH_SECCOMP_FILTER
 120         select HAVE_ARCH_SOFT_DIRTY
 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
 168
 169 source "init/Kconfig"
 170
 171 source "kernel/Kconfig.freezer"
 172
 173 source "kernel/livepatch/Kconfig"
 174
 175 menu "Processor type and features"
 176
 177 config HAVE_MARCH_Z900_FEATURES
 178         def_bool n
 179
 180 config HAVE_MARCH_Z990_FEATURES
 181         def_bool n
 182         select HAVE_MARCH_Z900_FEATURES
 183
 184 config HAVE_MARCH_Z9_109_FEATURES
 185         def_bool n
 186         select HAVE_MARCH_Z990_FEATURES
 187
 188 config HAVE_MARCH_Z10_FEATURES
 189         def_bool n
 190         select HAVE_MARCH_Z9_109_FEATURES
 191
 192 config HAVE_MARCH_Z196_FEATURES
 193         def_bool n
 194         select HAVE_MARCH_Z10_FEATURES
 195
 196 config HAVE_MARCH_ZEC12_FEATURES
 197         def_bool n
 198         select HAVE_MARCH_Z196_FEATURES
 199
 200 config HAVE_MARCH_Z13_FEATURES
 201         def_bool n
 202         select HAVE_MARCH_ZEC12_FEATURES
 203
 204 choice
 205         prompt "Processor type"
 206         default MARCH_Z900
 207
 208 config MARCH_Z900
 209         bool "IBM zSeries model z800 and z900"
 210         select HAVE_MARCH_Z900_FEATURES
 211         help
 212           Select this to enable optimizations for model z800/z900 (2064 and
 213           2066 series). This will enable some optimizations that are not
 214           available on older ESA/390 (31 Bit) only CPUs.
 215
 216 config MARCH_Z990
 217         bool "IBM zSeries model z890 and z990"
 218         select HAVE_MARCH_Z990_FEATURES
 219         help
 220           Select this to enable optimizations for model z890/z990 (2084 and
 221           2086 series). The kernel will be slightly faster but will not work
 222           on older machines.
 223
 224 config MARCH_Z9_109
 225         bool "IBM System z9"
 226         select HAVE_MARCH_Z9_109_FEATURES
 227         help
 228           Select this to enable optimizations for IBM System z9 (2094 and
 229           2096 series). The kernel will be slightly faster but will not work
 230           on older machines.
 231
 232 config MARCH_Z10
 233         bool "IBM System z10"
 234         select HAVE_MARCH_Z10_FEATURES
 235         help
 236           Select this to enable optimizations for IBM System z10 (2097 and
 237           2098 series). The kernel will be slightly faster but will not work
 238           on older machines.
 239
 240 config MARCH_Z196
 241         bool "IBM zEnterprise 114 and 196"
 242         select HAVE_MARCH_Z196_FEATURES
 243         help
 244           Select this to enable optimizations for IBM zEnterprise 114 and 196
 245           (2818 and 2817 series). The kernel will be slightly faster but will
 246           not work on older machines.
 247
 248 config MARCH_ZEC12
 249         bool "IBM zBC12 and zEC12"
 250         select HAVE_MARCH_ZEC12_FEATURES
 251         help
 252           Select this to enable optimizations for IBM zBC12 and zEC12 (2828 and
 253           2827 series). The kernel will be slightly faster but will not work on
 254           older machines.
 255
 256 config MARCH_Z13
 257         bool "IBM z13"
 258         select HAVE_MARCH_Z13_FEATURES
 259         help
 260           Select this to enable optimizations for IBM z13 (2964 series).
 261           The kernel will be slightly faster but will not work on older
 262           machines.
 263
 264 endchoice
 265
 266 config MARCH_Z900_TUNE
 267         def_bool TUNE_Z900 || MARCH_Z900 && TUNE_DEFAULT
 268
 269 config MARCH_Z990_TUNE
 270         def_bool TUNE_Z990 || MARCH_Z990 && TUNE_DEFAULT
 271
 272 config MARCH_Z9_109_TUNE
 273         def_bool TUNE_Z9_109 || MARCH_Z9_109 && TUNE_DEFAULT
 274
 275 config MARCH_Z10_TUNE
 276         def_bool TUNE_Z10 || MARCH_Z10 && TUNE_DEFAULT
 277
 278 config MARCH_Z196_TUNE
 279         def_bool TUNE_Z196 || MARCH_Z196 && TUNE_DEFAULT
 280
 281 config MARCH_ZEC12_TUNE
 282         def_bool TUNE_ZEC12 || MARCH_ZEC12 && TUNE_DEFAULT
 283
 284 config MARCH_Z13_TUNE
 285         def_bool TUNE_Z13 || MARCH_Z13 && TUNE_DEFAULT
 286
 287 choice
 288         prompt "Tune code generation"
 289         default TUNE_DEFAULT
 290         help
 291           Cause the compiler to tune (-mtune) the generated code for a machine.
 292           This will make the code run faster on the selected machine but
 293           somewhat slower on other machines.
 294           This option only changes how the compiler emits instructions, not the
 295           selection of instructions itself, so the resulting kernel will run on
 296           all other machines.
 297
 298 config TUNE_DEFAULT
 299         bool "Default"
 300         help
 301           Tune the generated code for the target processor for which the kernel
 302           will be compiled.
 303
 304 config TUNE_Z900
 305         bool "IBM zSeries model z800 and z900"
 306
 307 config TUNE_Z990
 308         bool "IBM zSeries model z890 and z990"
 309
 310 config TUNE_Z9_109
 311         bool "IBM System z9"
 312
 313 config TUNE_Z10
 314         bool "IBM System z10"
 315
 316 config TUNE_Z196
 317         bool "IBM zEnterprise 114 and 196"
 318
 319 config TUNE_ZEC12
 320         bool "IBM zBC12 and zEC12"
 321
 322 config TUNE_Z13
 323         bool "IBM z13"
 324
 325 endchoice
 326
 327 config 64BIT
 328         def_bool y
 329
 330 config COMPAT
 331         def_bool y
 332         prompt "Kernel support for 31 bit emulation"
 333         select COMPAT_BINFMT_ELF if BINFMT_ELF
 334         select ARCH_WANT_OLD_COMPAT_IPC
 335         select COMPAT_OLD_SIGACTION
 336         depends on MULTIUSER
 337         help
 338           Select this option if you want to enable your system kernel to
 339           handle system-calls from ELF binaries for 31 bit ESA.  This option
 340           (and some other stuff like libraries and such) is needed for
 341           executing 31 bit applications.  It is safe to say "Y".
 342
 343 config SYSVIPC_COMPAT
 344         def_bool y if COMPAT && SYSVIPC
 345
 346 config KEYS_COMPAT
 347         def_bool y if COMPAT && KEYS
 348
 349 config SMP
 350         def_bool y
 351         prompt "Symmetric multi-processing support"
 352         ---help---
 353           This enables support for systems with more than one CPU. If you have
 354           a system with only one CPU, like most personal computers, say N. If
 355           you have a system with more than one CPU, say Y.
 356
 357           If you say N here, the kernel will run on uni- and multiprocessor
 358           machines, but will use only one CPU of a multiprocessor machine. If
 359           you say Y here, the kernel will run on many, but not all,
 360           uniprocessor machines. On a uniprocessor machine, the kernel
 361           will run faster if you say N here.
 362
 363           See also the SMP-HOWTO available at
 364           <http://www.tldp.org/docs.html#howto>.
 365
 366           Even if you don't know what to do here, say Y.
 367
 368 config NR_CPUS
 369         int "Maximum number of CPUs (2-512)"
 370         range 2 512
 371         depends on SMP
 372         default "64"
 373         help
 374           This allows you to specify the maximum number of CPUs which this
 375           kernel will support. The maximum supported value is 512 and the
 376           minimum value which makes sense is 2.
 377
 378           This is purely to save memory - each supported CPU adds
 379           approximately sixteen kilobytes to the kernel image.
 380
 381 config HOTPLUG_CPU
 382         def_bool y
 383         prompt "Support for hot-pluggable CPUs"
 384         depends on SMP
 385         help
 386           Say Y here to be able to turn CPUs off and on. CPUs
 387           can be controlled through /sys/devices/system/cpu/cpu#.
 388           Say N if you want to disable CPU hotplug.
 389
 390 # Some NUMA nodes have memory ranges that span
 391 # other nodes.  Even though a pfn is valid and
 392 # between a node's start and end pfns, it may not
 393 # reside on that node.  See memmap_init_zone()
 394 # for details. <- They meant memory holes!
 395 config NODES_SPAN_OTHER_NODES
 396         def_bool NUMA
 397
 398 config NUMA
 399         bool "NUMA support"
 400         depends on SMP && SCHED_TOPOLOGY
 401         default n
 402         help
 403           Enable NUMA support
 404
 405           This option adds NUMA support to the kernel.
 406
 407           An operation mode can be selected by appending
 408           numa=<method> to the kernel command line.
 409
 410           The default behaviour is identical to appending numa=plain to
 411           the command line. This will create just one node with all
 412           available memory and all CPUs in it.
 413
 414 config NODES_SHIFT
 415         int "Maximum NUMA nodes (as a power of 2)"
 416         range 1 10
 417         depends on NUMA
 418         default "4"
 419         help
 420           Specify the maximum number of NUMA nodes available on the target
 421           system. Increases memory reserved to accommodate various tables.
 422
 423 menu "Select NUMA modes"
 424         depends on NUMA
 425
 426 config NUMA_EMU
 427         bool "NUMA emulation"
 428         default y
 429         help
 430           Numa emulation mode will split the available system memory into
 431           equal chunks which then are distributed over the configured number
 432           of nodes in a round-robin manner.
 433
 434           The number of fake nodes is limited by the number of available memory
 435           chunks (i.e. memory size / fake size) and the number of supported
 436           nodes in the kernel.
 437
 438           The CPUs are assigned to the nodes in a way that partially respects
 439           the original machine topology (if supported by the machine).
 440           Fair distribution of the CPUs is not guaranteed.
 441
 442 config EMU_SIZE
 443         hex "NUMA emulation memory chunk size"
 444         default 0x10000000
 445         range 0x400000 0x100000000
 446         depends on NUMA_EMU
 447         help
 448           Select the default size by which the memory is chopped and then
 449           assigned to emulated NUMA nodes.
 450
 451           This can be overridden by specifying
 452
 453           emu_size=<n>
 454
 455           on the kernel command line where also suffixes K, M, G, and T are
 456           supported.
 457
 458 endmenu
 459
 460 config SCHED_SMT
 461         def_bool n
 462
 463 config SCHED_MC
 464         def_bool n
 465
 466 config SCHED_BOOK
 467         def_bool n
 468
 469 config SCHED_TOPOLOGY
 470         def_bool y
 471         prompt "Topology scheduler support"
 472         depends on SMP
 473         select SCHED_SMT
 474         select SCHED_MC
 475         select SCHED_BOOK
 476         help
 477           Topology scheduler support improves the CPU scheduler's decision
 478           making when dealing with machines that have multi-threading,
 479           multiple cores or multiple books.
 480
 481 source kernel/Kconfig.preempt
 482
 483 source kernel/Kconfig.hz
 484
 485 endmenu
 486
 487 menu "Memory setup"
 488
 489 config ARCH_SPARSEMEM_ENABLE
 490         def_bool y
 491         select SPARSEMEM_VMEMMAP_ENABLE
 492         select SPARSEMEM_VMEMMAP
 493
 494 config ARCH_SPARSEMEM_DEFAULT
 495         def_bool y
 496
 497 config ARCH_SELECT_MEMORY_MODEL
 498         def_bool y
 499
 500 config ARCH_ENABLE_MEMORY_HOTPLUG
 501         def_bool y if SPARSEMEM
 502
 503 config ARCH_ENABLE_MEMORY_HOTREMOVE
 504         def_bool y
 505
 506 config ARCH_ENABLE_SPLIT_PMD_PTLOCK
 507         def_bool y
 508
 509 config FORCE_MAX_ZONEORDER
 510         int
 511         default "9"
 512
 513 source "mm/Kconfig"
 514
 515 config PACK_STACK
 516         def_bool y
 517         prompt "Pack kernel stack"
 518         help
 519           This option enables the compiler option -mkernel-backchain if it
 520           is available. If the option is available the compiler supports
 521           the new stack layout which dramatically reduces the minimum stack
 522           frame size. With an old compiler a non-leaf function needs a
 523           minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
 524           -mkernel-backchain the minimum size drops to 16 byte on 31 bit
 525           and 24 byte on 64 bit.
 526
 527           Say Y if you are unsure.
 528
 529 config CHECK_STACK
 530         def_bool y
 531         prompt "Detect kernel stack overflow"
 532         help
 533           This option enables the compiler option -mstack-guard and
 534           -mstack-size if they are available. If the compiler supports them
 535           it will emit additional code to each function prolog to trigger
 536           an illegal operation if the kernel stack is about to overflow.
 537
 538           Say N if you are unsure.
 539
 540 config STACK_GUARD
 541         int "Size of the guard area (128-1024)"
 542         range 128 1024
 543         depends on CHECK_STACK
 544         default "256"
 545         help
 546           This allows you to specify the size of the guard area at the lower
 547           end of the kernel stack. If the kernel stack points into the guard
 548           area on function entry an illegal operation is triggered. The size
 549           needs to be a power of 2. Please keep in mind that the size of an
 550           interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
 551           The minimum size for the stack guard should be 256 for 31 bit and
 552           512 for 64 bit.
 553
 554 config WARN_DYNAMIC_STACK
 555         def_bool n
 556         prompt "Emit compiler warnings for function with dynamic stack usage"
 557         help
 558           This option enables the compiler option -mwarn-dynamicstack. If the
 559           compiler supports this options generates warnings for functions
 560           that dynamically allocate stack space using alloca.
 561
 562           Say N if you are unsure.
 563
 564 endmenu
 565
 566 menu "I/O subsystem"
 567
 568 config QDIO
 569         def_tristate y
 570         prompt "QDIO support"
 571         ---help---
 572           This driver provides the Queued Direct I/O base support for
 573           IBM System z.
 574
 575           To compile this driver as a module, choose M here: the
 576           module will be called qdio.
 577
 578           If unsure, say Y.
 579
 580 menuconfig PCI
 581         bool "PCI support"
 582         select PCI_MSI
 583         select IOMMU_SUPPORT
 584         help
 585           Enable PCI support.
 586
 587 if PCI
 588
 589 config PCI_NR_FUNCTIONS
 590         int "Maximum number of PCI functions (1-4096)"
 591         range 1 4096
 592         default "64"
 593         help
 594           This allows you to specify the maximum number of PCI functions which
 595           this kernel will support.
 596
 597 config PCI_NR_MSI
 598         int "Maximum number of MSI interrupts (64-32768)"
 599         range 64 32768
 600         default "256"
 601         help
 602           This defines the number of virtual interrupts the kernel will
 603           provide for MSI interrupts. If you configure your system to have
 604           too few drivers will fail to allocate MSI interrupts for all
 605           PCI devices.
 606
 607 source "drivers/pci/Kconfig"
 608 source "drivers/pci/pcie/Kconfig"
 609 source "drivers/pci/hotplug/Kconfig"
 610
 611 endif   # PCI
 612
 613 config PCI_DOMAINS
 614         def_bool PCI
 615
 616 config HAS_IOMEM
 617         def_bool PCI
 618
 619 config IOMMU_HELPER
 620         def_bool PCI
 621
 622 config HAS_DMA
 623         def_bool PCI
 624         select HAVE_DMA_API_DEBUG
 625
 626 config NEED_SG_DMA_LENGTH
 627         def_bool PCI
 628
 629 config NEED_DMA_MAP_STATE
 630         def_bool PCI
 631
 632 config CHSC_SCH
 633         def_tristate m
 634         prompt "Support for CHSC subchannels"
 635         help
 636           This driver allows usage of CHSC subchannels. A CHSC subchannel
 637           is usually present on LPAR only.
 638           The driver creates a device /dev/chsc, which may be used to
 639           obtain I/O configuration information about the machine and
 640           to issue asynchronous chsc commands (DANGEROUS).
 641           You will usually only want to use this interface on a special
 642           LPAR designated for system management.
 643
 644           To compile this driver as a module, choose M here: the
 645           module will be called chsc_sch.
 646
 647           If unsure, say N.
 648
 649 config SCM_BUS
 650         def_bool y
 651         prompt "SCM bus driver"
 652         help
 653           Bus driver for Storage Class Memory.
 654
 655 config EADM_SCH
 656         def_tristate m
 657         prompt "Support for EADM subchannels"
 658         depends on SCM_BUS
 659         help
 660           This driver allows usage of EADM subchannels. EADM subchannels act
 661           as a communication vehicle for SCM increments.
 662
 663           To compile this driver as a module, choose M here: the
 664           module will be called eadm_sch.
 665
 666 endmenu
 667
 668 menu "Dump support"
 669
 670 config CRASH_DUMP
 671         bool "kernel crash dumps"
 672         depends on SMP
 673         select KEXEC
 674         help
 675           Generate crash dump after being started by kexec.
 676           Crash dump kernels are loaded in the main kernel with kexec-tools
 677           into a specially reserved region and then later executed after
 678           a crash by kdump/kexec.
 679           Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this.
 680           This option also enables s390 zfcpdump.
 681           See also <file:Documentation/s390/zfcpdump.txt>
 682
 683 endmenu
 684
 685 menu "Executable file formats / Emulations"
 686
 687 source "fs/Kconfig.binfmt"
 688
 689 config SECCOMP
 690         def_bool y
 691         prompt "Enable seccomp to safely compute untrusted bytecode"
 692         depends on PROC_FS
 693         help
 694           This kernel feature is useful for number crunching applications
 695           that may need to compute untrusted bytecode during their
 696           execution. By using pipes or other transports made available to
 697           the process as file descriptors supporting the read/write
 698           syscalls, it's possible to isolate those applications in
 699           their own address space using seccomp. Once seccomp is
 700           enabled via /proc/<pid>/seccomp, it cannot be disabled
 701           and the task is only allowed to execute a few safe syscalls
 702           defined by each seccomp mode.
 703
 704           If unsure, say Y.
 705
 706 endmenu
 707
 708 menu "Power Management"
 709
 710 config ARCH_HIBERNATION_POSSIBLE
 711         def_bool y
 712
 713 source "kernel/power/Kconfig"
 714
 715 endmenu
 716
 717 source "net/Kconfig"
 718
 719 config PCMCIA
 720         def_bool n
 721
 722 config CCW
 723         def_bool y
 724
 725 source "drivers/Kconfig"
 726
 727 source "fs/Kconfig"
 728
 729 source "arch/s390/Kconfig.debug"
 730
 731 source "security/Kconfig"
 732
 733 source "crypto/Kconfig"
 734
 735 source "lib/Kconfig"
 736
 737 menu "Virtualization"
 738
 739 config PFAULT
 740         def_bool y
 741         prompt "Pseudo page fault support"
 742         help
 743           Select this option, if you want to use PFAULT pseudo page fault
 744           handling under VM. If running native or in LPAR, this option
 745           has no effect. If your VM does not support PFAULT, PAGEEX
 746           pseudo page fault handling will be used.
 747           Note that VM 4.2 supports PFAULT but has a bug in its
 748           implementation that causes some problems.
 749           Everybody who wants to run Linux under VM != VM4.2 should select
 750           this option.
 751
 752 config SHARED_KERNEL
 753         bool "VM shared kernel support"
 754         depends on !JUMP_LABEL
 755         help
 756           Select this option, if you want to share the text segment of the
 757           Linux kernel between different VM guests. This reduces memory
 758           usage with lots of guests but greatly increases kernel size.
 759           Also if a kernel was IPL'ed from a shared segment the kexec system
 760           call will not work.
 761           You should only select this option if you know what you are
 762           doing and want to exploit this feature.
 763
 764 config CMM
 765         def_tristate n
 766         prompt "Cooperative memory management"
 767         help
 768           Select this option, if you want to enable the kernel interface
 769           to reduce the memory size of the system. This is accomplished
 770           by allocating pages of memory and put them "on hold". This only
 771           makes sense for a system running under VM where the unused pages
 772           will be reused by VM for other guest systems. The interface
 773           allows an external monitor to balance memory of many systems.
 774           Everybody who wants to run Linux under VM should select this
 775           option.
 776
 777 config CMM_IUCV
 778         def_bool y
 779         prompt "IUCV special message interface to cooperative memory management"
 780         depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
 781         help
 782           Select this option to enable the special message interface to
 783           the cooperative memory management.
 784
 785 config APPLDATA_BASE
 786         def_bool n
 787         prompt "Linux - VM Monitor Stream, base infrastructure"
 788         depends on PROC_FS
 789         help
 790           This provides a kernel interface for creating and updating z/VM APPLDATA
 791           monitor records. The monitor records are updated at certain time
 792           intervals, once the timer is started.
 793           Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
 794           i.e. enables or disables monitoring on the Linux side.
 795           A custom interval value (in seconds) can be written to
 796           /proc/appldata/interval.
 797
 798           Defaults are 60 seconds interval and timer off.
 799           The /proc entries can also be read from, showing the current settings.
 800
 801 config APPLDATA_MEM
 802         def_tristate m
 803         prompt "Monitor memory management statistics"
 804         depends on APPLDATA_BASE && VM_EVENT_COUNTERS
 805         help
 806           This provides memory management related data to the Linux - VM Monitor
 807           Stream, like paging/swapping rate, memory utilisation, etc.
 808           Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
 809           APPLDATA monitor record, i.e. enables or disables monitoring this record
 810           on the z/VM side.
 811
 812           Default is disabled.
 813           The /proc entry can also be read from, showing the current settings.
 814
 815           This can also be compiled as a module, which will be called
 816           appldata_mem.o.
 817
 818 config APPLDATA_OS
 819         def_tristate m
 820         prompt "Monitor OS statistics"
 821         depends on APPLDATA_BASE
 822         help
 823           This provides OS related data to the Linux - VM Monitor Stream, like
 824           CPU utilisation, etc.
 825           Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
 826           APPLDATA monitor record, i.e. enables or disables monitoring this record
 827           on the z/VM side.
 828
 829           Default is disabled.
 830           This can also be compiled as a module, which will be called
 831           appldata_os.o.
 832
 833 config APPLDATA_NET_SUM
 834         def_tristate m
 835         prompt "Monitor overall network statistics"
 836         depends on APPLDATA_BASE && NET
 837         help
 838           This provides network related data to the Linux - VM Monitor Stream,
 839           currently there is only a total sum of network I/O statistics, no
 840           per-interface data.
 841           Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
 842           APPLDATA monitor record, i.e. enables or disables monitoring this record
 843           on the z/VM side.
 844
 845           Default is disabled.
 846           This can also be compiled as a module, which will be called
 847           appldata_net_sum.o.
 848
 849 config S390_HYPFS_FS
 850         def_bool y
 851         prompt "s390 hypervisor file system support"
 852         select SYS_HYPERVISOR
 853         help
 854           This is a virtual file system intended to provide accounting
 855           information in an s390 hypervisor environment.
 856
 857 source "arch/s390/kvm/Kconfig"
 858
 859 config S390_GUEST
 860         def_bool y
 861         prompt "s390 support for virtio devices"
 862         select TTY
 863         select VIRTUALIZATION
 864         select VIRTIO
 865         select VIRTIO_CONSOLE
 866         help
 867           Enabling this option adds support for virtio based paravirtual device
 868           drivers on s390.
 869
 870           Select this option if you want to run the kernel as a guest under
 871           the KVM hypervisor.
 872
 873 endmenu