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_BUILTIN_BSWAP
 105         select ARCH_USE_CMPXCHG_LOCKREF
 106         select ARCH_WANTS_PROT_NUMA_PROT_NONE
 107         select ARCH_WANT_IPC_PARSE_VERSION
 108         select BUILDTIME_EXTABLE_SORT
 109         select CLONE_BACKWARDS2
 110         select DYNAMIC_FTRACE if FUNCTION_TRACER
 111         select GENERIC_CLOCKEVENTS
 112         select GENERIC_CPU_AUTOPROBE
 113         select GENERIC_CPU_DEVICES if !SMP
 114         select GENERIC_FIND_FIRST_BIT
 115         select GENERIC_SMP_IDLE_THREAD
 116         select GENERIC_TIME_VSYSCALL
 117         select HAVE_ALIGNED_STRUCT_PAGE if SLUB
 118         select HAVE_ARCH_AUDITSYSCALL
 119         select HAVE_ARCH_EARLY_PFN_TO_NID
 120         select HAVE_ARCH_JUMP_LABEL
 121         select HAVE_ARCH_SECCOMP_FILTER
 122         select HAVE_ARCH_SOFT_DIRTY
 123         select HAVE_ARCH_TRACEHOOK
 124         select HAVE_ARCH_TRANSPARENT_HUGEPAGE
 125         select HAVE_BPF_JIT if PACK_STACK && HAVE_MARCH_Z196_FEATURES
 126         select HAVE_CMPXCHG_DOUBLE
 127         select HAVE_CMPXCHG_LOCAL
 128         select HAVE_DEBUG_KMEMLEAK
 129         select HAVE_DYNAMIC_FTRACE
 130         select HAVE_DYNAMIC_FTRACE_WITH_REGS
 131         select HAVE_FTRACE_MCOUNT_RECORD
 132         select HAVE_FUNCTION_GRAPH_TRACER
 133         select HAVE_FUNCTION_TRACER
 134         select HAVE_FUTEX_CMPXCHG if FUTEX
 135         select HAVE_KERNEL_BZIP2
 136         select HAVE_KERNEL_GZIP
 137         select HAVE_KERNEL_LZ4
 138         select HAVE_KERNEL_LZMA
 139         select HAVE_KERNEL_LZO
 140         select HAVE_KERNEL_XZ
 141         select HAVE_KPROBES
 142         select HAVE_KRETPROBES
 143         select HAVE_KVM
 144         select HAVE_LIVEPATCH
 145         select HAVE_MEMBLOCK
 146         select HAVE_MEMBLOCK_NODE_MAP
 147         select HAVE_MEMBLOCK_PHYS_MAP
 148         select HAVE_MOD_ARCH_SPECIFIC
 149         select HAVE_OPROFILE
 150         select HAVE_PERF_EVENTS
 151         select HAVE_REGS_AND_STACK_ACCESS_API
 152         select HAVE_SYSCALL_TRACEPOINTS
 153         select HAVE_VIRT_CPU_ACCOUNTING
 154         select MODULES_USE_ELF_RELA
 155         select NO_BOOTMEM
 156         select OLD_SIGACTION
 157         select OLD_SIGSUSPEND3
 158         select SYSCTL_EXCEPTION_TRACE
 159         select TTY
 160         select VIRT_CPU_ACCOUNTING
 161         select VIRT_TO_BUS
 162
 163
 164 config SCHED_OMIT_FRAME_POINTER
 165         def_bool y
 166
 167 config PGTABLE_LEVELS
 168         int
 169         default 4
 170
 171 source "init/Kconfig"
 172
 173 source "kernel/Kconfig.freezer"
 174
 175 source "kernel/livepatch/Kconfig"
 176
 177 menu "Processor type and features"
 178
 179 config HAVE_MARCH_Z900_FEATURES
 180         def_bool n
 181
 182 config HAVE_MARCH_Z990_FEATURES
 183         def_bool n
 184         select HAVE_MARCH_Z900_FEATURES
 185
 186 config HAVE_MARCH_Z9_109_FEATURES
 187         def_bool n
 188         select HAVE_MARCH_Z990_FEATURES
 189
 190 config HAVE_MARCH_Z10_FEATURES
 191         def_bool n
 192         select HAVE_MARCH_Z9_109_FEATURES
 193
 194 config HAVE_MARCH_Z196_FEATURES
 195         def_bool n
 196         select HAVE_MARCH_Z10_FEATURES
 197
 198 config HAVE_MARCH_ZEC12_FEATURES
 199         def_bool n
 200         select HAVE_MARCH_Z196_FEATURES
 201
 202 config HAVE_MARCH_Z13_FEATURES
 203         def_bool n
 204         select HAVE_MARCH_ZEC12_FEATURES
 205
 206 choice
 207         prompt "Processor type"
 208         default MARCH_Z900
 209
 210 config MARCH_Z900
 211         bool "IBM zSeries model z800 and z900"
 212         select HAVE_MARCH_Z900_FEATURES
 213         help
 214           Select this to enable optimizations for model z800/z900 (2064 and
 215           2066 series). This will enable some optimizations that are not
 216           available on older ESA/390 (31 Bit) only CPUs.
 217
 218 config MARCH_Z990
 219         bool "IBM zSeries model z890 and z990"
 220         select HAVE_MARCH_Z990_FEATURES
 221         help
 222           Select this to enable optimizations for model z890/z990 (2084 and
 223           2086 series). The kernel will be slightly faster but will not work
 224           on older machines.
 225
 226 config MARCH_Z9_109
 227         bool "IBM System z9"
 228         select HAVE_MARCH_Z9_109_FEATURES
 229         help
 230           Select this to enable optimizations for IBM System z9 (2094 and
 231           2096 series). The kernel will be slightly faster but will not work
 232           on older machines.
 233
 234 config MARCH_Z10
 235         bool "IBM System z10"
 236         select HAVE_MARCH_Z10_FEATURES
 237         help
 238           Select this to enable optimizations for IBM System z10 (2097 and
 239           2098 series). The kernel will be slightly faster but will not work
 240           on older machines.
 241
 242 config MARCH_Z196
 243         bool "IBM zEnterprise 114 and 196"
 244         select HAVE_MARCH_Z196_FEATURES
 245         help
 246           Select this to enable optimizations for IBM zEnterprise 114 and 196
 247           (2818 and 2817 series). The kernel will be slightly faster but will
 248           not work on older machines.
 249
 250 config MARCH_ZEC12
 251         bool "IBM zBC12 and zEC12"
 252         select HAVE_MARCH_ZEC12_FEATURES
 253         help
 254           Select this to enable optimizations for IBM zBC12 and zEC12 (2828 and
 255           2827 series). The kernel will be slightly faster but will not work on
 256           older machines.
 257
 258 config MARCH_Z13
 259         bool "IBM z13"
 260         select HAVE_MARCH_Z13_FEATURES
 261         help
 262           Select this to enable optimizations for IBM z13 (2964 series).
 263           The kernel will be slightly faster but will not work on older
 264           machines.
 265
 266 endchoice
 267
 268 config MARCH_Z900_TUNE
 269         def_bool TUNE_Z900 || MARCH_Z900 && TUNE_DEFAULT
 270
 271 config MARCH_Z990_TUNE
 272         def_bool TUNE_Z990 || MARCH_Z990 && TUNE_DEFAULT
 273
 274 config MARCH_Z9_109_TUNE
 275         def_bool TUNE_Z9_109 || MARCH_Z9_109 && TUNE_DEFAULT
 276
 277 config MARCH_Z10_TUNE
 278         def_bool TUNE_Z10 || MARCH_Z10 && TUNE_DEFAULT
 279
 280 config MARCH_Z196_TUNE
 281         def_bool TUNE_Z196 || MARCH_Z196 && TUNE_DEFAULT
 282
 283 config MARCH_ZEC12_TUNE
 284         def_bool TUNE_ZEC12 || MARCH_ZEC12 && TUNE_DEFAULT
 285
 286 config MARCH_Z13_TUNE
 287         def_bool TUNE_Z13 || MARCH_Z13 && TUNE_DEFAULT
 288
 289 choice
 290         prompt "Tune code generation"
 291         default TUNE_DEFAULT
 292         help
 293           Cause the compiler to tune (-mtune) the generated code for a machine.
 294           This will make the code run faster on the selected machine but
 295           somewhat slower on other machines.
 296           This option only changes how the compiler emits instructions, not the
 297           selection of instructions itself, so the resulting kernel will run on
 298           all other machines.
 299
 300 config TUNE_DEFAULT
 301         bool "Default"
 302         help
 303           Tune the generated code for the target processor for which the kernel
 304           will be compiled.
 305
 306 config TUNE_Z900
 307         bool "IBM zSeries model z800 and z900"
 308
 309 config TUNE_Z990
 310         bool "IBM zSeries model z890 and z990"
 311
 312 config TUNE_Z9_109
 313         bool "IBM System z9"
 314
 315 config TUNE_Z10
 316         bool "IBM System z10"
 317
 318 config TUNE_Z196
 319         bool "IBM zEnterprise 114 and 196"
 320
 321 config TUNE_ZEC12
 322         bool "IBM zBC12 and zEC12"
 323
 324 config TUNE_Z13
 325         bool "IBM z13"
 326
 327 endchoice
 328
 329 config 64BIT
 330         def_bool y
 331
 332 config COMPAT
 333         def_bool y
 334         prompt "Kernel support for 31 bit emulation"
 335         select COMPAT_BINFMT_ELF if BINFMT_ELF
 336         select ARCH_WANT_OLD_COMPAT_IPC
 337         select COMPAT_OLD_SIGACTION
 338         depends on MULTIUSER
 339         help
 340           Select this option if you want to enable your system kernel to
 341           handle system-calls from ELF binaries for 31 bit ESA.  This option
 342           (and some other stuff like libraries and such) is needed for
 343           executing 31 bit applications.  It is safe to say "Y".
 344
 345 config SYSVIPC_COMPAT
 346         def_bool y if COMPAT && SYSVIPC
 347
 348 config KEYS_COMPAT
 349         def_bool y if COMPAT && KEYS
 350
 351 config SMP
 352         def_bool y
 353         prompt "Symmetric multi-processing support"
 354         ---help---
 355           This enables support for systems with more than one CPU. If you have
 356           a system with only one CPU, like most personal computers, say N. If
 357           you have a system with more than one CPU, say Y.
 358
 359           If you say N here, the kernel will run on uni- and multiprocessor
 360           machines, but will use only one CPU of a multiprocessor machine. If
 361           you say Y here, the kernel will run on many, but not all,
 362           uniprocessor machines. On a uniprocessor machine, the kernel
 363           will run faster if you say N here.
 364
 365           See also the SMP-HOWTO available at
 366           <http://www.tldp.org/docs.html#howto>.
 367
 368           Even if you don't know what to do here, say Y.
 369
 370 config NR_CPUS
 371         int "Maximum number of CPUs (2-512)"
 372         range 2 512
 373         depends on SMP
 374         default "64"
 375         help
 376           This allows you to specify the maximum number of CPUs which this
 377           kernel will support. The maximum supported value is 512 and the
 378           minimum value which makes sense is 2.
 379
 380           This is purely to save memory - each supported CPU adds
 381           approximately sixteen kilobytes to the kernel image.
 382
 383 config HOTPLUG_CPU
 384         def_bool y
 385         prompt "Support for hot-pluggable CPUs"
 386         depends on SMP
 387         help
 388           Say Y here to be able to turn CPUs off and on. CPUs
 389           can be controlled through /sys/devices/system/cpu/cpu#.
 390           Say N if you want to disable CPU hotplug.
 391
 392 # Some NUMA nodes have memory ranges that span
 393 # other nodes.  Even though a pfn is valid and
 394 # between a node's start and end pfns, it may not
 395 # reside on that node.  See memmap_init_zone()
 396 # for details. <- They meant memory holes!
 397 config NODES_SPAN_OTHER_NODES
 398         def_bool NUMA
 399
 400 config NUMA
 401         bool "NUMA support"
 402         depends on SMP && SCHED_TOPOLOGY
 403         default n
 404         help
 405           Enable NUMA support
 406
 407           This option adds NUMA support to the kernel.
 408
 409           An operation mode can be selected by appending
 410           numa=<method> to the kernel command line.
 411
 412           The default behaviour is identical to appending numa=plain to
 413           the command line. This will create just one node with all
 414           available memory and all CPUs in it.
 415
 416 config NODES_SHIFT
 417         int "Maximum NUMA nodes (as a power of 2)"
 418         range 1 10
 419         depends on NUMA
 420         default "4"
 421         help
 422           Specify the maximum number of NUMA nodes available on the target
 423           system. Increases memory reserved to accommodate various tables.
 424
 425 menu "Select NUMA modes"
 426         depends on NUMA
 427
 428 config NUMA_EMU
 429         bool "NUMA emulation"
 430         default y
 431         help
 432           Numa emulation mode will split the available system memory into
 433           equal chunks which then are distributed over the configured number
 434           of nodes in a round-robin manner.
 435
 436           The number of fake nodes is limited by the number of available memory
 437           chunks (i.e. memory size / fake size) and the number of supported
 438           nodes in the kernel.
 439
 440           The CPUs are assigned to the nodes in a way that partially respects
 441           the original machine topology (if supported by the machine).
 442           Fair distribution of the CPUs is not guaranteed.
 443
 444 config EMU_SIZE
 445         hex "NUMA emulation memory chunk size"
 446         default 0x10000000
 447         range 0x400000 0x100000000
 448         depends on NUMA_EMU
 449         help
 450           Select the default size by which the memory is chopped and then
 451           assigned to emulated NUMA nodes.
 452
 453           This can be overridden by specifying
 454
 455           emu_size=<n>
 456
 457           on the kernel command line where also suffixes K, M, G, and T are
 458           supported.
 459
 460 endmenu
 461
 462 config SCHED_SMT
 463         def_bool n
 464
 465 config SCHED_MC
 466         def_bool n
 467
 468 config SCHED_BOOK
 469         def_bool n
 470
 471 config SCHED_TOPOLOGY
 472         def_bool y
 473         prompt "Topology scheduler support"
 474         depends on SMP
 475         select SCHED_SMT
 476         select SCHED_MC
 477         select SCHED_BOOK
 478         help
 479           Topology scheduler support improves the CPU scheduler's decision
 480           making when dealing with machines that have multi-threading,
 481           multiple cores or multiple books.
 482
 483 source kernel/Kconfig.preempt
 484
 485 source kernel/Kconfig.hz
 486
 487 endmenu
 488
 489 menu "Memory setup"
 490
 491 config ARCH_SPARSEMEM_ENABLE
 492         def_bool y
 493         select SPARSEMEM_VMEMMAP_ENABLE
 494         select SPARSEMEM_VMEMMAP
 495
 496 config ARCH_SPARSEMEM_DEFAULT
 497         def_bool y
 498
 499 config ARCH_SELECT_MEMORY_MODEL
 500         def_bool y
 501
 502 config ARCH_ENABLE_MEMORY_HOTPLUG
 503         def_bool y if SPARSEMEM
 504
 505 config ARCH_ENABLE_MEMORY_HOTREMOVE
 506         def_bool y
 507
 508 config ARCH_ENABLE_SPLIT_PMD_PTLOCK
 509         def_bool y
 510
 511 config FORCE_MAX_ZONEORDER
 512         int
 513         default "9"
 514
 515 source "mm/Kconfig"
 516
 517 config PACK_STACK
 518         def_bool y
 519         prompt "Pack kernel stack"
 520         help
 521           This option enables the compiler option -mkernel-backchain if it
 522           is available. If the option is available the compiler supports
 523           the new stack layout which dramatically reduces the minimum stack
 524           frame size. With an old compiler a non-leaf function needs a
 525           minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
 526           -mkernel-backchain the minimum size drops to 16 byte on 31 bit
 527           and 24 byte on 64 bit.
 528
 529           Say Y if you are unsure.
 530
 531 config CHECK_STACK
 532         def_bool y
 533         prompt "Detect kernel stack overflow"
 534         help
 535           This option enables the compiler option -mstack-guard and
 536           -mstack-size if they are available. If the compiler supports them
 537           it will emit additional code to each function prolog to trigger
 538           an illegal operation if the kernel stack is about to overflow.
 539
 540           Say N if you are unsure.
 541
 542 config STACK_GUARD
 543         int "Size of the guard area (128-1024)"
 544         range 128 1024
 545         depends on CHECK_STACK
 546         default "256"
 547         help
 548           This allows you to specify the size of the guard area at the lower
 549           end of the kernel stack. If the kernel stack points into the guard
 550           area on function entry an illegal operation is triggered. The size
 551           needs to be a power of 2. Please keep in mind that the size of an
 552           interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
 553           The minimum size for the stack guard should be 256 for 31 bit and
 554           512 for 64 bit.
 555
 556 config WARN_DYNAMIC_STACK
 557         def_bool n
 558         prompt "Emit compiler warnings for function with dynamic stack usage"
 559         help
 560           This option enables the compiler option -mwarn-dynamicstack. If the
 561           compiler supports this options generates warnings for functions
 562           that dynamically allocate stack space using alloca.
 563
 564           Say N if you are unsure.
 565
 566 endmenu
 567
 568 menu "I/O subsystem"
 569
 570 config QDIO
 571         def_tristate y
 572         prompt "QDIO support"
 573         ---help---
 574           This driver provides the Queued Direct I/O base support for
 575           IBM System z.
 576
 577           To compile this driver as a module, choose M here: the
 578           module will be called qdio.
 579
 580           If unsure, say Y.
 581
 582 menuconfig PCI
 583         bool "PCI support"
 584         select HAVE_DMA_ATTRS
 585         select PCI_MSI
 586         select IOMMU_SUPPORT
 587         help
 588           Enable PCI support.
 589
 590 if PCI
 591
 592 config PCI_NR_FUNCTIONS
 593         int "Maximum number of PCI functions (1-4096)"
 594         range 1 4096
 595         default "64"
 596         help
 597           This allows you to specify the maximum number of PCI functions which
 598           this kernel will support.
 599
 600 config PCI_NR_MSI
 601         int "Maximum number of MSI interrupts (64-32768)"
 602         range 64 32768
 603         default "256"
 604         help
 605           This defines the number of virtual interrupts the kernel will
 606           provide for MSI interrupts. If you configure your system to have
 607           too few drivers will fail to allocate MSI interrupts for all
 608           PCI devices.
 609
 610 source "drivers/pci/Kconfig"
 611 source "drivers/pci/pcie/Kconfig"
 612 source "drivers/pci/hotplug/Kconfig"
 613
 614 endif   # PCI
 615
 616 config PCI_DOMAINS
 617         def_bool PCI
 618
 619 config HAS_IOMEM
 620         def_bool PCI
 621
 622 config IOMMU_HELPER
 623         def_bool PCI
 624
 625 config HAS_DMA
 626         def_bool PCI
 627         select HAVE_DMA_API_DEBUG
 628
 629 config NEED_SG_DMA_LENGTH
 630         def_bool PCI
 631
 632 config NEED_DMA_MAP_STATE
 633         def_bool PCI
 634
 635 config CHSC_SCH
 636         def_tristate m
 637         prompt "Support for CHSC subchannels"
 638         help
 639           This driver allows usage of CHSC subchannels. A CHSC subchannel
 640           is usually present on LPAR only.
 641           The driver creates a device /dev/chsc, which may be used to
 642           obtain I/O configuration information about the machine and
 643           to issue asynchronous chsc commands (DANGEROUS).
 644           You will usually only want to use this interface on a special
 645           LPAR designated for system management.
 646
 647           To compile this driver as a module, choose M here: the
 648           module will be called chsc_sch.
 649
 650           If unsure, say N.
 651
 652 config SCM_BUS
 653         def_bool y
 654         prompt "SCM bus driver"
 655         help
 656           Bus driver for Storage Class Memory.
 657
 658 config EADM_SCH
 659         def_tristate m
 660         prompt "Support for EADM subchannels"
 661         depends on SCM_BUS
 662         help
 663           This driver allows usage of EADM subchannels. EADM subchannels act
 664           as a communication vehicle for SCM increments.
 665
 666           To compile this driver as a module, choose M here: the
 667           module will be called eadm_sch.
 668
 669 endmenu
 670
 671 menu "Dump support"
 672
 673 config CRASH_DUMP
 674         bool "kernel crash dumps"
 675         depends on SMP
 676         select KEXEC
 677         help
 678           Generate crash dump after being started by kexec.
 679           Crash dump kernels are loaded in the main kernel with kexec-tools
 680           into a specially reserved region and then later executed after
 681           a crash by kdump/kexec.
 682           Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this.
 683           This option also enables s390 zfcpdump.
 684           See also <file:Documentation/s390/zfcpdump.txt>
 685
 686 endmenu
 687
 688 menu "Executable file formats / Emulations"
 689
 690 source "fs/Kconfig.binfmt"
 691
 692 config SECCOMP
 693         def_bool y
 694         prompt "Enable seccomp to safely compute untrusted bytecode"
 695         depends on PROC_FS
 696         help
 697           This kernel feature is useful for number crunching applications
 698           that may need to compute untrusted bytecode during their
 699           execution. By using pipes or other transports made available to
 700           the process as file descriptors supporting the read/write
 701           syscalls, it's possible to isolate those applications in
 702           their own address space using seccomp. Once seccomp is
 703           enabled via /proc/<pid>/seccomp, it cannot be disabled
 704           and the task is only allowed to execute a few safe syscalls
 705           defined by each seccomp mode.
 706
 707           If unsure, say Y.
 708
 709 endmenu
 710
 711 menu "Power Management"
 712
 713 config ARCH_HIBERNATION_POSSIBLE
 714         def_bool y
 715
 716 source "kernel/power/Kconfig"
 717
 718 endmenu
 719
 720 source "net/Kconfig"
 721
 722 config PCMCIA
 723         def_bool n
 724
 725 config CCW
 726         def_bool y
 727
 728 source "drivers/Kconfig"
 729
 730 source "fs/Kconfig"
 731
 732 source "arch/s390/Kconfig.debug"
 733
 734 source "security/Kconfig"
 735
 736 source "crypto/Kconfig"
 737
 738 source "lib/Kconfig"
 739
 740 menu "Virtualization"
 741
 742 config PFAULT
 743         def_bool y
 744         prompt "Pseudo page fault support"
 745         help
 746           Select this option, if you want to use PFAULT pseudo page fault
 747           handling under VM. If running native or in LPAR, this option
 748           has no effect. If your VM does not support PFAULT, PAGEEX
 749           pseudo page fault handling will be used.
 750           Note that VM 4.2 supports PFAULT but has a bug in its
 751           implementation that causes some problems.
 752           Everybody who wants to run Linux under VM != VM4.2 should select
 753           this option.
 754
 755 config SHARED_KERNEL
 756         bool "VM shared kernel support"
 757         depends on !JUMP_LABEL
 758         help
 759           Select this option, if you want to share the text segment of the
 760           Linux kernel between different VM guests. This reduces memory
 761           usage with lots of guests but greatly increases kernel size.
 762           Also if a kernel was IPL'ed from a shared segment the kexec system
 763           call will not work.
 764           You should only select this option if you know what you are
 765           doing and want to exploit this feature.
 766
 767 config CMM
 768         def_tristate n
 769         prompt "Cooperative memory management"
 770         help
 771           Select this option, if you want to enable the kernel interface
 772           to reduce the memory size of the system. This is accomplished
 773           by allocating pages of memory and put them "on hold". This only
 774           makes sense for a system running under VM where the unused pages
 775           will be reused by VM for other guest systems. The interface
 776           allows an external monitor to balance memory of many systems.
 777           Everybody who wants to run Linux under VM should select this
 778           option.
 779
 780 config CMM_IUCV
 781         def_bool y
 782         prompt "IUCV special message interface to cooperative memory management"
 783         depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
 784         help
 785           Select this option to enable the special message interface to
 786           the cooperative memory management.
 787
 788 config APPLDATA_BASE
 789         def_bool n
 790         prompt "Linux - VM Monitor Stream, base infrastructure"
 791         depends on PROC_FS
 792         help
 793           This provides a kernel interface for creating and updating z/VM APPLDATA
 794           monitor records. The monitor records are updated at certain time
 795           intervals, once the timer is started.
 796           Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
 797           i.e. enables or disables monitoring on the Linux side.
 798           A custom interval value (in seconds) can be written to
 799           /proc/appldata/interval.
 800
 801           Defaults are 60 seconds interval and timer off.
 802           The /proc entries can also be read from, showing the current settings.
 803
 804 config APPLDATA_MEM
 805         def_tristate m
 806         prompt "Monitor memory management statistics"
 807         depends on APPLDATA_BASE && VM_EVENT_COUNTERS
 808         help
 809           This provides memory management related data to the Linux - VM Monitor
 810           Stream, like paging/swapping rate, memory utilisation, etc.
 811           Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
 812           APPLDATA monitor record, i.e. enables or disables monitoring this record
 813           on the z/VM side.
 814
 815           Default is disabled.
 816           The /proc entry can also be read from, showing the current settings.
 817
 818           This can also be compiled as a module, which will be called
 819           appldata_mem.o.
 820
 821 config APPLDATA_OS
 822         def_tristate m
 823         prompt "Monitor OS statistics"
 824         depends on APPLDATA_BASE
 825         help
 826           This provides OS related data to the Linux - VM Monitor Stream, like
 827           CPU utilisation, etc.
 828           Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
 829           APPLDATA monitor record, i.e. enables or disables monitoring this record
 830           on the z/VM side.
 831
 832           Default is disabled.
 833           This can also be compiled as a module, which will be called
 834           appldata_os.o.
 835
 836 config APPLDATA_NET_SUM
 837         def_tristate m
 838         prompt "Monitor overall network statistics"
 839         depends on APPLDATA_BASE && NET
 840         help
 841           This provides network related data to the Linux - VM Monitor Stream,
 842           currently there is only a total sum of network I/O statistics, no
 843           per-interface data.
 844           Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
 845           APPLDATA monitor record, i.e. enables or disables monitoring this record
 846           on the z/VM side.
 847
 848           Default is disabled.
 849           This can also be compiled as a module, which will be called
 850           appldata_net_sum.o.
 851
 852 config S390_HYPFS_FS
 853         def_bool y
 854         prompt "s390 hypervisor file system support"
 855         select SYS_HYPERVISOR
 856         help
 857           This is a virtual file system intended to provide accounting
 858           information in an s390 hypervisor environment.
 859
 860 source "arch/s390/kvm/Kconfig"
 861
 862 config S390_GUEST
 863         def_bool y
 864         prompt "s390 support for virtio devices"
 865         select TTY
 866         select VIRTUALIZATION
 867         select VIRTIO
 868         select VIRTIO_CONSOLE
 869         help
 870           Enabling this option adds support for virtio based paravirtual device
 871           drivers on s390.
 872
 873           Select this option if you want to run the kernel as a guest under
 874           the KVM hypervisor.
 875
 876 endmenu