arch/s390/Kconfig

   1 config MMU
   2         def_bool y
   3
   4 config ZONE_DMA
   5         def_bool y
   6
   7 config CPU_BIG_ENDIAN
   8         def_bool y
   9
  10 config LOCKDEP_SUPPORT
  11         def_bool y
  12
  13 config STACKTRACE_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_DEVMEM_IS_ALLOWED
  68         select ARCH_HAS_ELF_RANDOMIZE
  69         select ARCH_HAS_GCOV_PROFILE_ALL
  70         select ARCH_HAS_GIGANTIC_PAGE
  71         select ARCH_HAS_KCOV
  72         select ARCH_HAS_SET_MEMORY
  73         select ARCH_HAS_SG_CHAIN
  74         select ARCH_HAS_STRICT_KERNEL_RWX
  75         select ARCH_HAS_STRICT_MODULE_RWX
  76         select ARCH_HAS_UBSAN_SANITIZE_ALL
  77         select ARCH_HAVE_NMI_SAFE_CMPXCHG
  78         select ARCH_INLINE_READ_LOCK
  79         select ARCH_INLINE_READ_LOCK_BH
  80         select ARCH_INLINE_READ_LOCK_IRQ
  81         select ARCH_INLINE_READ_LOCK_IRQSAVE
  82         select ARCH_INLINE_READ_TRYLOCK
  83         select ARCH_INLINE_READ_UNLOCK
  84         select ARCH_INLINE_READ_UNLOCK_BH
  85         select ARCH_INLINE_READ_UNLOCK_IRQ
  86         select ARCH_INLINE_READ_UNLOCK_IRQRESTORE
  87         select ARCH_INLINE_SPIN_LOCK
  88         select ARCH_INLINE_SPIN_LOCK_BH
  89         select ARCH_INLINE_SPIN_LOCK_IRQ
  90         select ARCH_INLINE_SPIN_LOCK_IRQSAVE
  91         select ARCH_INLINE_SPIN_TRYLOCK
  92         select ARCH_INLINE_SPIN_TRYLOCK_BH
  93         select ARCH_INLINE_SPIN_UNLOCK
  94         select ARCH_INLINE_SPIN_UNLOCK_BH
  95         select ARCH_INLINE_SPIN_UNLOCK_IRQ
  96         select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE
  97         select ARCH_INLINE_WRITE_LOCK
  98         select ARCH_INLINE_WRITE_LOCK_BH
  99         select ARCH_INLINE_WRITE_LOCK_IRQ
 100         select ARCH_INLINE_WRITE_LOCK_IRQSAVE
 101         select ARCH_INLINE_WRITE_TRYLOCK
 102         select ARCH_INLINE_WRITE_UNLOCK
 103         select ARCH_INLINE_WRITE_UNLOCK_BH
 104         select ARCH_INLINE_WRITE_UNLOCK_IRQ
 105         select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE
 106         select ARCH_SAVE_PAGE_KEYS if HIBERNATION
 107         select ARCH_SUPPORTS_ATOMIC_RMW
 108         select ARCH_SUPPORTS_NUMA_BALANCING
 109         select ARCH_USE_BUILTIN_BSWAP
 110         select ARCH_USE_CMPXCHG_LOCKREF
 111         select ARCH_WANTS_DYNAMIC_TASK_STRUCT
 112         select ARCH_WANTS_PROT_NUMA_PROT_NONE
 113         select ARCH_WANTS_UBSAN_NO_NULL
 114         select ARCH_WANT_IPC_PARSE_VERSION
 115         select BUILDTIME_EXTABLE_SORT
 116         select CLONE_BACKWARDS2
 117         select DYNAMIC_FTRACE if FUNCTION_TRACER
 118         select GENERIC_CLOCKEVENTS
 119         select GENERIC_CPU_AUTOPROBE
 120         select GENERIC_CPU_DEVICES if !SMP
 121         select GENERIC_FIND_FIRST_BIT
 122         select GENERIC_SMP_IDLE_THREAD
 123         select GENERIC_TIME_VSYSCALL
 124         select HAVE_ALIGNED_STRUCT_PAGE if SLUB
 125         select HAVE_ARCH_AUDITSYSCALL
 126         select HAVE_ARCH_EARLY_PFN_TO_NID
 127         select HAVE_ARCH_HARDENED_USERCOPY
 128         select HAVE_ARCH_JUMP_LABEL
 129         select CPU_NO_EFFICIENT_FFS if !HAVE_MARCH_Z9_109_FEATURES
 130         select HAVE_ARCH_SECCOMP_FILTER
 131         select HAVE_ARCH_SOFT_DIRTY
 132         select HAVE_ARCH_TRACEHOOK
 133         select HAVE_ARCH_TRANSPARENT_HUGEPAGE
 134         select HAVE_EBPF_JIT if PACK_STACK && HAVE_MARCH_Z196_FEATURES
 135         select HAVE_CMPXCHG_DOUBLE
 136         select HAVE_CMPXCHG_LOCAL
 137         select HAVE_COPY_THREAD_TLS
 138         select HAVE_DEBUG_KMEMLEAK
 139         select HAVE_DMA_API_DEBUG
 140         select HAVE_DMA_CONTIGUOUS
 141         select DMA_NOOP_OPS
 142         select HAVE_DYNAMIC_FTRACE
 143         select HAVE_DYNAMIC_FTRACE_WITH_REGS
 144         select HAVE_EFFICIENT_UNALIGNED_ACCESS
 145         select HAVE_EXIT_THREAD
 146         select HAVE_FTRACE_MCOUNT_RECORD
 147         select HAVE_FUNCTION_GRAPH_TRACER
 148         select HAVE_FUNCTION_TRACER
 149         select HAVE_FUTEX_CMPXCHG if FUTEX
 150         select HAVE_KERNEL_BZIP2
 151         select HAVE_KERNEL_GZIP
 152         select HAVE_KERNEL_LZ4
 153         select HAVE_KERNEL_LZMA
 154         select HAVE_KERNEL_LZO
 155         select HAVE_KERNEL_XZ
 156         select HAVE_KPROBES
 157         select HAVE_KRETPROBES
 158         select HAVE_KVM
 159         select HAVE_LIVEPATCH
 160         select HAVE_MEMBLOCK
 161         select HAVE_MEMBLOCK_NODE_MAP
 162         select HAVE_MEMBLOCK_PHYS_MAP
 163         select HAVE_MOD_ARCH_SPECIFIC
 164         select HAVE_OPROFILE
 165         select HAVE_PERF_EVENTS
 166         select HAVE_REGS_AND_STACK_ACCESS_API
 167         select HAVE_SYSCALL_TRACEPOINTS
 168         select HAVE_VIRT_CPU_ACCOUNTING
 169         select MODULES_USE_ELF_RELA
 170         select NO_BOOTMEM
 171         select OLD_SIGACTION
 172         select OLD_SIGSUSPEND3
 173         select SPARSE_IRQ
 174         select SYSCTL_EXCEPTION_TRACE
 175         select THREAD_INFO_IN_TASK
 176         select TTY
 177         select VIRT_CPU_ACCOUNTING
 178         select ARCH_HAS_SCALED_CPUTIME
 179         select VIRT_TO_BUS
 180         select HAVE_NMI
 181
 182
 183 config SCHED_OMIT_FRAME_POINTER
 184         def_bool y
 185
 186 config PGTABLE_LEVELS
 187         int
 188         default 4
 189
 190 source "init/Kconfig"
 191
 192 source "kernel/Kconfig.freezer"
 193
 194 source "kernel/livepatch/Kconfig"
 195
 196 menu "Processor type and features"
 197
 198 config HAVE_MARCH_Z900_FEATURES
 199         def_bool n
 200
 201 config HAVE_MARCH_Z990_FEATURES
 202         def_bool n
 203         select HAVE_MARCH_Z900_FEATURES
 204
 205 config HAVE_MARCH_Z9_109_FEATURES
 206         def_bool n
 207         select HAVE_MARCH_Z990_FEATURES
 208
 209 config HAVE_MARCH_Z10_FEATURES
 210         def_bool n
 211         select HAVE_MARCH_Z9_109_FEATURES
 212
 213 config HAVE_MARCH_Z196_FEATURES
 214         def_bool n
 215         select HAVE_MARCH_Z10_FEATURES
 216
 217 config HAVE_MARCH_ZEC12_FEATURES
 218         def_bool n
 219         select HAVE_MARCH_Z196_FEATURES
 220
 221 config HAVE_MARCH_Z13_FEATURES
 222         def_bool n
 223         select HAVE_MARCH_ZEC12_FEATURES
 224
 225 choice
 226         prompt "Processor type"
 227         default MARCH_Z196
 228
 229 config MARCH_Z900
 230         bool "IBM zSeries model z800 and z900"
 231         select HAVE_MARCH_Z900_FEATURES
 232         help
 233           Select this to enable optimizations for model z800/z900 (2064 and
 234           2066 series). This will enable some optimizations that are not
 235           available on older ESA/390 (31 Bit) only CPUs.
 236
 237 config MARCH_Z990
 238         bool "IBM zSeries model z890 and z990"
 239         select HAVE_MARCH_Z990_FEATURES
 240         help
 241           Select this to enable optimizations for model z890/z990 (2084 and
 242           2086 series). The kernel will be slightly faster but will not work
 243           on older machines.
 244
 245 config MARCH_Z9_109
 246         bool "IBM System z9"
 247         select HAVE_MARCH_Z9_109_FEATURES
 248         help
 249           Select this to enable optimizations for IBM System z9 (2094 and
 250           2096 series). The kernel will be slightly faster but will not work
 251           on older machines.
 252
 253 config MARCH_Z10
 254         bool "IBM System z10"
 255         select HAVE_MARCH_Z10_FEATURES
 256         help
 257           Select this to enable optimizations for IBM System z10 (2097 and
 258           2098 series). The kernel will be slightly faster but will not work
 259           on older machines.
 260
 261 config MARCH_Z196
 262         bool "IBM zEnterprise 114 and 196"
 263         select HAVE_MARCH_Z196_FEATURES
 264         help
 265           Select this to enable optimizations for IBM zEnterprise 114 and 196
 266           (2818 and 2817 series). The kernel will be slightly faster but will
 267           not work on older machines.
 268
 269 config MARCH_ZEC12
 270         bool "IBM zBC12 and zEC12"
 271         select HAVE_MARCH_ZEC12_FEATURES
 272         help
 273           Select this to enable optimizations for IBM zBC12 and zEC12 (2828 and
 274           2827 series). The kernel will be slightly faster but will not work on
 275           older machines.
 276
 277 config MARCH_Z13
 278         bool "IBM z13s and z13"
 279         select HAVE_MARCH_Z13_FEATURES
 280         help
 281           Select this to enable optimizations for IBM z13s and z13 (2965 and
 282           2964 series). The kernel will be slightly faster but will not work on
 283           older machines.
 284
 285 endchoice
 286
 287 config MARCH_Z900_TUNE
 288         def_bool TUNE_Z900 || MARCH_Z900 && TUNE_DEFAULT
 289
 290 config MARCH_Z990_TUNE
 291         def_bool TUNE_Z990 || MARCH_Z990 && TUNE_DEFAULT
 292
 293 config MARCH_Z9_109_TUNE
 294         def_bool TUNE_Z9_109 || MARCH_Z9_109 && TUNE_DEFAULT
 295
 296 config MARCH_Z10_TUNE
 297         def_bool TUNE_Z10 || MARCH_Z10 && TUNE_DEFAULT
 298
 299 config MARCH_Z196_TUNE
 300         def_bool TUNE_Z196 || MARCH_Z196 && TUNE_DEFAULT
 301
 302 config MARCH_ZEC12_TUNE
 303         def_bool TUNE_ZEC12 || MARCH_ZEC12 && TUNE_DEFAULT
 304
 305 config MARCH_Z13_TUNE
 306         def_bool TUNE_Z13 || MARCH_Z13 && TUNE_DEFAULT
 307
 308 choice
 309         prompt "Tune code generation"
 310         default TUNE_DEFAULT
 311         help
 312           Cause the compiler to tune (-mtune) the generated code for a machine.
 313           This will make the code run faster on the selected machine but
 314           somewhat slower on other machines.
 315           This option only changes how the compiler emits instructions, not the
 316           selection of instructions itself, so the resulting kernel will run on
 317           all other machines.
 318
 319 config TUNE_DEFAULT
 320         bool "Default"
 321         help
 322           Tune the generated code for the target processor for which the kernel
 323           will be compiled.
 324
 325 config TUNE_Z900
 326         bool "IBM zSeries model z800 and z900"
 327
 328 config TUNE_Z990
 329         bool "IBM zSeries model z890 and z990"
 330
 331 config TUNE_Z9_109
 332         bool "IBM System z9"
 333
 334 config TUNE_Z10
 335         bool "IBM System z10"
 336
 337 config TUNE_Z196
 338         bool "IBM zEnterprise 114 and 196"
 339
 340 config TUNE_ZEC12
 341         bool "IBM zBC12 and zEC12"
 342
 343 config TUNE_Z13
 344         bool "IBM z13"
 345
 346 endchoice
 347
 348 config 64BIT
 349         def_bool y
 350
 351 config COMPAT
 352         def_bool y
 353         prompt "Kernel support for 31 bit emulation"
 354         select COMPAT_BINFMT_ELF if BINFMT_ELF
 355         select ARCH_WANT_OLD_COMPAT_IPC
 356         select COMPAT_OLD_SIGACTION
 357         depends on MULTIUSER
 358         help
 359           Select this option if you want to enable your system kernel to
 360           handle system-calls from ELF binaries for 31 bit ESA.  This option
 361           (and some other stuff like libraries and such) is needed for
 362           executing 31 bit applications.  It is safe to say "Y".
 363
 364 config SYSVIPC_COMPAT
 365         def_bool y if COMPAT && SYSVIPC
 366
 367 config KEYS_COMPAT
 368         def_bool y if COMPAT && KEYS
 369
 370 config SMP
 371         def_bool y
 372         prompt "Symmetric multi-processing support"
 373         ---help---
 374           This enables support for systems with more than one CPU. If you have
 375           a system with only one CPU, like most personal computers, say N. If
 376           you have a system with more than one CPU, say Y.
 377
 378           If you say N here, the kernel will run on uni- and multiprocessor
 379           machines, but will use only one CPU of a multiprocessor machine. If
 380           you say Y here, the kernel will run on many, but not all,
 381           uniprocessor machines. On a uniprocessor machine, the kernel
 382           will run faster if you say N here.
 383
 384           See also the SMP-HOWTO available at
 385           <http://www.tldp.org/docs.html#howto>.
 386
 387           Even if you don't know what to do here, say Y.
 388
 389 config NR_CPUS
 390         int "Maximum number of CPUs (2-512)"
 391         range 2 512
 392         depends on SMP
 393         default "64"
 394         help
 395           This allows you to specify the maximum number of CPUs which this
 396           kernel will support. The maximum supported value is 512 and the
 397           minimum value which makes sense is 2.
 398
 399           This is purely to save memory - each supported CPU adds
 400           approximately sixteen kilobytes to the kernel image.
 401
 402 config HOTPLUG_CPU
 403         def_bool y
 404         prompt "Support for hot-pluggable CPUs"
 405         depends on SMP
 406         help
 407           Say Y here to be able to turn CPUs off and on. CPUs
 408           can be controlled through /sys/devices/system/cpu/cpu#.
 409           Say N if you want to disable CPU hotplug.
 410
 411 # Some NUMA nodes have memory ranges that span
 412 # other nodes.  Even though a pfn is valid and
 413 # between a node's start and end pfns, it may not
 414 # reside on that node.  See memmap_init_zone()
 415 # for details. <- They meant memory holes!
 416 config NODES_SPAN_OTHER_NODES
 417         def_bool NUMA
 418
 419 config NUMA
 420         bool "NUMA support"
 421         depends on SMP && SCHED_TOPOLOGY
 422         default n
 423         help
 424           Enable NUMA support
 425
 426           This option adds NUMA support to the kernel.
 427
 428           An operation mode can be selected by appending
 429           numa=<method> to the kernel command line.
 430
 431           The default behaviour is identical to appending numa=plain to
 432           the command line. This will create just one node with all
 433           available memory and all CPUs in it.
 434
 435 config NODES_SHIFT
 436         int "Maximum NUMA nodes (as a power of 2)"
 437         range 1 10
 438         depends on NUMA
 439         default "4"
 440         help
 441           Specify the maximum number of NUMA nodes available on the target
 442           system. Increases memory reserved to accommodate various tables.
 443
 444 menu "Select NUMA modes"
 445         depends on NUMA
 446
 447 config NUMA_EMU
 448         bool "NUMA emulation"
 449         default y
 450         help
 451           Numa emulation mode will split the available system memory into
 452           equal chunks which then are distributed over the configured number
 453           of nodes in a round-robin manner.
 454
 455           The number of fake nodes is limited by the number of available memory
 456           chunks (i.e. memory size / fake size) and the number of supported
 457           nodes in the kernel.
 458
 459           The CPUs are assigned to the nodes in a way that partially respects
 460           the original machine topology (if supported by the machine).
 461           Fair distribution of the CPUs is not guaranteed.
 462
 463 config EMU_SIZE
 464         hex "NUMA emulation memory chunk size"
 465         default 0x10000000
 466         range 0x400000 0x100000000
 467         depends on NUMA_EMU
 468         help
 469           Select the default size by which the memory is chopped and then
 470           assigned to emulated NUMA nodes.
 471
 472           This can be overridden by specifying
 473
 474           emu_size=<n>
 475
 476           on the kernel command line where also suffixes K, M, G, and T are
 477           supported.
 478
 479 endmenu
 480
 481 config SCHED_SMT
 482         def_bool n
 483
 484 config SCHED_MC
 485         def_bool n
 486
 487 config SCHED_BOOK
 488         def_bool n
 489
 490 config SCHED_DRAWER
 491         def_bool n
 492
 493 config SCHED_TOPOLOGY
 494         def_bool y
 495         prompt "Topology scheduler support"
 496         depends on SMP
 497         select SCHED_SMT
 498         select SCHED_MC
 499         select SCHED_BOOK
 500         select SCHED_DRAWER
 501         help
 502           Topology scheduler support improves the CPU scheduler's decision
 503           making when dealing with machines that have multi-threading,
 504           multiple cores or multiple books.
 505
 506 source kernel/Kconfig.preempt
 507
 508 source kernel/Kconfig.hz
 509
 510 endmenu
 511
 512 menu "Memory setup"
 513
 514 config ARCH_SPARSEMEM_ENABLE
 515         def_bool y
 516         select SPARSEMEM_VMEMMAP_ENABLE
 517         select SPARSEMEM_VMEMMAP
 518
 519 config ARCH_SPARSEMEM_DEFAULT
 520         def_bool y
 521
 522 config ARCH_SELECT_MEMORY_MODEL
 523         def_bool y
 524
 525 config ARCH_ENABLE_MEMORY_HOTPLUG
 526         def_bool y if SPARSEMEM
 527
 528 config ARCH_ENABLE_MEMORY_HOTREMOVE
 529         def_bool y
 530
 531 config ARCH_ENABLE_SPLIT_PMD_PTLOCK
 532         def_bool y
 533
 534 config FORCE_MAX_ZONEORDER
 535         int
 536         default "9"
 537
 538 source "mm/Kconfig"
 539
 540 config PACK_STACK
 541         def_bool y
 542         prompt "Pack kernel stack"
 543         help
 544           This option enables the compiler option -mkernel-backchain if it
 545           is available. If the option is available the compiler supports
 546           the new stack layout which dramatically reduces the minimum stack
 547           frame size. With an old compiler a non-leaf function needs a
 548           minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
 549           -mkernel-backchain the minimum size drops to 16 byte on 31 bit
 550           and 24 byte on 64 bit.
 551
 552           Say Y if you are unsure.
 553
 554 config CHECK_STACK
 555         def_bool y
 556         prompt "Detect kernel stack overflow"
 557         help
 558           This option enables the compiler option -mstack-guard and
 559           -mstack-size if they are available. If the compiler supports them
 560           it will emit additional code to each function prolog to trigger
 561           an illegal operation if the kernel stack is about to overflow.
 562
 563           Say N if you are unsure.
 564
 565 config STACK_GUARD
 566         int "Size of the guard area (128-1024)"
 567         range 128 1024
 568         depends on CHECK_STACK
 569         default "256"
 570         help
 571           This allows you to specify the size of the guard area at the lower
 572           end of the kernel stack. If the kernel stack points into the guard
 573           area on function entry an illegal operation is triggered. The size
 574           needs to be a power of 2. Please keep in mind that the size of an
 575           interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
 576           The minimum size for the stack guard should be 256 for 31 bit and
 577           512 for 64 bit.
 578
 579 config WARN_DYNAMIC_STACK
 580         def_bool n
 581         prompt "Emit compiler warnings for function with dynamic stack usage"
 582         help
 583           This option enables the compiler option -mwarn-dynamicstack. If the
 584           compiler supports this options generates warnings for functions
 585           that dynamically allocate stack space using alloca.
 586
 587           Say N if you are unsure.
 588
 589 endmenu
 590
 591 menu "I/O subsystem"
 592
 593 config QDIO
 594         def_tristate y
 595         prompt "QDIO support"
 596         ---help---
 597           This driver provides the Queued Direct I/O base support for
 598           IBM System z.
 599
 600           To compile this driver as a module, choose M here: the
 601           module will be called qdio.
 602
 603           If unsure, say Y.
 604
 605 menuconfig PCI
 606         bool "PCI support"
 607         select PCI_MSI
 608         select IOMMU_SUPPORT
 609         help
 610           Enable PCI support.
 611
 612 if PCI
 613
 614 config PCI_NR_FUNCTIONS
 615         int "Maximum number of PCI functions (1-4096)"
 616         range 1 4096
 617         default "64"
 618         help
 619           This allows you to specify the maximum number of PCI functions which
 620           this kernel will support.
 621
 622 source "drivers/pci/Kconfig"
 623
 624 endif   # PCI
 625
 626 config PCI_DOMAINS
 627         def_bool PCI
 628
 629 config HAS_IOMEM
 630         def_bool PCI
 631
 632 config IOMMU_HELPER
 633         def_bool PCI
 634
 635 config NEED_SG_DMA_LENGTH
 636         def_bool PCI
 637
 638 config NEED_DMA_MAP_STATE
 639         def_bool PCI
 640
 641 config CHSC_SCH
 642         def_tristate m
 643         prompt "Support for CHSC subchannels"
 644         help
 645           This driver allows usage of CHSC subchannels. A CHSC subchannel
 646           is usually present on LPAR only.
 647           The driver creates a device /dev/chsc, which may be used to
 648           obtain I/O configuration information about the machine and
 649           to issue asynchronous chsc commands (DANGEROUS).
 650           You will usually only want to use this interface on a special
 651           LPAR designated for system management.
 652
 653           To compile this driver as a module, choose M here: the
 654           module will be called chsc_sch.
 655
 656           If unsure, say N.
 657
 658 config SCM_BUS
 659         def_bool y
 660         prompt "SCM bus driver"
 661         help
 662           Bus driver for Storage Class Memory.
 663
 664 config EADM_SCH
 665         def_tristate m
 666         prompt "Support for EADM subchannels"
 667         depends on SCM_BUS
 668         help
 669           This driver allows usage of EADM subchannels. EADM subchannels act
 670           as a communication vehicle for SCM increments.
 671
 672           To compile this driver as a module, choose M here: the
 673           module will be called eadm_sch.
 674
 675 endmenu
 676
 677 menu "Dump support"
 678
 679 config CRASH_DUMP
 680         bool "kernel crash dumps"
 681         depends on SMP
 682         select KEXEC
 683         help
 684           Generate crash dump after being started by kexec.
 685           Crash dump kernels are loaded in the main kernel with kexec-tools
 686           into a specially reserved region and then later executed after
 687           a crash by kdump/kexec.
 688           Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this.
 689           This option also enables s390 zfcpdump.
 690           See also <file:Documentation/s390/zfcpdump.txt>
 691
 692 endmenu
 693
 694 menu "Executable file formats / Emulations"
 695
 696 source "fs/Kconfig.binfmt"
 697
 698 config SECCOMP
 699         def_bool y
 700         prompt "Enable seccomp to safely compute untrusted bytecode"
 701         depends on PROC_FS
 702         help
 703           This kernel feature is useful for number crunching applications
 704           that may need to compute untrusted bytecode during their
 705           execution. By using pipes or other transports made available to
 706           the process as file descriptors supporting the read/write
 707           syscalls, it's possible to isolate those applications in
 708           their own address space using seccomp. Once seccomp is
 709           enabled via /proc/<pid>/seccomp, it cannot be disabled
 710           and the task is only allowed to execute a few safe syscalls
 711           defined by each seccomp mode.
 712
 713           If unsure, say Y.
 714
 715 endmenu
 716
 717 menu "Power Management"
 718
 719 config ARCH_HIBERNATION_POSSIBLE
 720         def_bool y
 721
 722 source "kernel/power/Kconfig"
 723
 724 endmenu
 725
 726 source "net/Kconfig"
 727
 728 config PCMCIA
 729         def_bool n
 730
 731 config CCW
 732         def_bool y
 733
 734 source "drivers/Kconfig"
 735
 736 source "fs/Kconfig"
 737
 738 source "arch/s390/Kconfig.debug"
 739
 740 source "security/Kconfig"
 741
 742 source "crypto/Kconfig"
 743
 744 source "lib/Kconfig"
 745
 746 menu "Virtualization"
 747
 748 config PFAULT
 749         def_bool y
 750         prompt "Pseudo page fault support"
 751         help
 752           Select this option, if you want to use PFAULT pseudo page fault
 753           handling under VM. If running native or in LPAR, this option
 754           has no effect. If your VM does not support PFAULT, PAGEEX
 755           pseudo page fault handling will be used.
 756           Note that VM 4.2 supports PFAULT but has a bug in its
 757           implementation that causes some problems.
 758           Everybody who wants to run Linux under VM != VM4.2 should select
 759           this option.
 760
 761 config SHARED_KERNEL
 762         bool "VM shared kernel support"
 763         depends on !JUMP_LABEL
 764         help
 765           Select this option, if you want to share the text segment of the
 766           Linux kernel between different VM guests. This reduces memory
 767           usage with lots of guests but greatly increases kernel size.
 768           Also if a kernel was IPL'ed from a shared segment the kexec system
 769           call will not work.
 770           You should only select this option if you know what you are
 771           doing and want to exploit this feature.
 772
 773 config CMM
 774         def_tristate n
 775         prompt "Cooperative memory management"
 776         help
 777           Select this option, if you want to enable the kernel interface
 778           to reduce the memory size of the system. This is accomplished
 779           by allocating pages of memory and put them "on hold". This only
 780           makes sense for a system running under VM where the unused pages
 781           will be reused by VM for other guest systems. The interface
 782           allows an external monitor to balance memory of many systems.
 783           Everybody who wants to run Linux under VM should select this
 784           option.
 785
 786 config CMM_IUCV
 787         def_bool y
 788         prompt "IUCV special message interface to cooperative memory management"
 789         depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
 790         help
 791           Select this option to enable the special message interface to
 792           the cooperative memory management.
 793
 794 config APPLDATA_BASE
 795         def_bool n
 796         prompt "Linux - VM Monitor Stream, base infrastructure"
 797         depends on PROC_FS
 798         help
 799           This provides a kernel interface for creating and updating z/VM APPLDATA
 800           monitor records. The monitor records are updated at certain time
 801           intervals, once the timer is started.
 802           Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
 803           i.e. enables or disables monitoring on the Linux side.
 804           A custom interval value (in seconds) can be written to
 805           /proc/appldata/interval.
 806
 807           Defaults are 60 seconds interval and timer off.
 808           The /proc entries can also be read from, showing the current settings.
 809
 810 config APPLDATA_MEM
 811         def_tristate m
 812         prompt "Monitor memory management statistics"
 813         depends on APPLDATA_BASE && VM_EVENT_COUNTERS
 814         help
 815           This provides memory management related data to the Linux - VM Monitor
 816           Stream, like paging/swapping rate, memory utilisation, etc.
 817           Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
 818           APPLDATA monitor record, i.e. enables or disables monitoring this record
 819           on the z/VM side.
 820
 821           Default is disabled.
 822           The /proc entry can also be read from, showing the current settings.
 823
 824           This can also be compiled as a module, which will be called
 825           appldata_mem.o.
 826
 827 config APPLDATA_OS
 828         def_tristate m
 829         prompt "Monitor OS statistics"
 830         depends on APPLDATA_BASE
 831         help
 832           This provides OS related data to the Linux - VM Monitor Stream, like
 833           CPU utilisation, etc.
 834           Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
 835           APPLDATA monitor record, i.e. enables or disables monitoring this record
 836           on the z/VM side.
 837
 838           Default is disabled.
 839           This can also be compiled as a module, which will be called
 840           appldata_os.o.
 841
 842 config APPLDATA_NET_SUM
 843         def_tristate m
 844         prompt "Monitor overall network statistics"
 845         depends on APPLDATA_BASE && NET
 846         help
 847           This provides network related data to the Linux - VM Monitor Stream,
 848           currently there is only a total sum of network I/O statistics, no
 849           per-interface data.
 850           Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
 851           APPLDATA monitor record, i.e. enables or disables monitoring this record
 852           on the z/VM side.
 853
 854           Default is disabled.
 855           This can also be compiled as a module, which will be called
 856           appldata_net_sum.o.
 857
 858 config S390_HYPFS_FS
 859         def_bool y
 860         prompt "s390 hypervisor file system support"
 861         select SYS_HYPERVISOR
 862         help
 863           This is a virtual file system intended to provide accounting
 864           information in an s390 hypervisor environment.
 865
 866 source "arch/s390/kvm/Kconfig"
 867
 868 config S390_GUEST
 869         def_bool y
 870         prompt "s390 support for virtio devices"
 871         select TTY
 872         select VIRTUALIZATION
 873         select VIRTIO
 874         select VIRTIO_CONSOLE
 875         help
 876           Enabling this option adds support for virtio based paravirtual device
 877           drivers on s390.
 878
 879           Select this option if you want to run the kernel as a guest under
 880           the KVM hypervisor.
 881
 882 config S390_GUEST_OLD_TRANSPORT
 883         def_bool y
 884         prompt "Guest support for old s390 virtio transport (DEPRECATED)"
 885         depends on S390_GUEST
 886         help
 887           Enable this option to add support for the old s390-virtio
 888           transport (i.e. virtio devices NOT based on virtio-ccw). This
 889           type of virtio devices is only available on the experimental
 890           kuli userspace or with old (< 2.6) qemu. If you are running
 891           with a modern version of qemu (which supports virtio-ccw since
 892           1.4 and uses it by default since version 2.4), you probably won't
 893           need this.
 894
 895 endmenu