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_DEFERRED_STRUCT_PAGE_INIT
 109         select ARCH_SUPPORTS_NUMA_BALANCING
 110         select ARCH_USE_BUILTIN_BSWAP
 111         select ARCH_USE_CMPXCHG_LOCKREF
 112         select ARCH_WANTS_DYNAMIC_TASK_STRUCT
 113         select ARCH_WANTS_PROT_NUMA_PROT_NONE
 114         select ARCH_WANTS_UBSAN_NO_NULL
 115         select ARCH_WANT_IPC_PARSE_VERSION
 116         select BUILDTIME_EXTABLE_SORT
 117         select CLONE_BACKWARDS2
 118         select DYNAMIC_FTRACE if FUNCTION_TRACER
 119         select GENERIC_CLOCKEVENTS
 120         select GENERIC_CPU_AUTOPROBE
 121         select GENERIC_CPU_DEVICES if !SMP
 122         select GENERIC_FIND_FIRST_BIT
 123         select GENERIC_SMP_IDLE_THREAD
 124         select GENERIC_TIME_VSYSCALL
 125         select HAVE_ALIGNED_STRUCT_PAGE if SLUB
 126         select HAVE_ARCH_AUDITSYSCALL
 127         select HAVE_ARCH_JUMP_LABEL
 128         select CPU_NO_EFFICIENT_FFS if !HAVE_MARCH_Z9_109_FEATURES
 129         select HAVE_ARCH_SECCOMP_FILTER
 130         select HAVE_ARCH_SOFT_DIRTY
 131         select HAVE_ARCH_TRACEHOOK
 132         select HAVE_ARCH_TRANSPARENT_HUGEPAGE
 133         select HAVE_EBPF_JIT if PACK_STACK && HAVE_MARCH_Z196_FEATURES
 134         select HAVE_CMPXCHG_DOUBLE
 135         select HAVE_CMPXCHG_LOCAL
 136         select HAVE_COPY_THREAD_TLS
 137         select HAVE_DEBUG_KMEMLEAK
 138         select HAVE_DMA_API_DEBUG
 139         select HAVE_DMA_CONTIGUOUS
 140         select DMA_NOOP_OPS
 141         select HAVE_DYNAMIC_FTRACE
 142         select HAVE_DYNAMIC_FTRACE_WITH_REGS
 143         select HAVE_EFFICIENT_UNALIGNED_ACCESS
 144         select HAVE_EXIT_THREAD
 145         select HAVE_FTRACE_MCOUNT_RECORD
 146         select HAVE_FUNCTION_GRAPH_TRACER
 147         select HAVE_FUNCTION_TRACER
 148         select HAVE_FUTEX_CMPXCHG if FUTEX
 149         select HAVE_KERNEL_BZIP2
 150         select HAVE_KERNEL_GZIP
 151         select HAVE_KERNEL_LZ4
 152         select HAVE_KERNEL_LZMA
 153         select HAVE_KERNEL_LZO
 154         select HAVE_KERNEL_XZ
 155         select HAVE_KPROBES
 156         select HAVE_KRETPROBES
 157         select HAVE_KVM
 158         select HAVE_LIVEPATCH
 159         select HAVE_MEMBLOCK
 160         select HAVE_MEMBLOCK_NODE_MAP
 161         select HAVE_MEMBLOCK_PHYS_MAP
 162         select HAVE_MOD_ARCH_SPECIFIC
 163         select HAVE_OPROFILE
 164         select HAVE_PERF_EVENTS
 165         select HAVE_REGS_AND_STACK_ACCESS_API
 166         select HAVE_SYSCALL_TRACEPOINTS
 167         select HAVE_VIRT_CPU_ACCOUNTING
 168         select MODULES_USE_ELF_RELA
 169         select NO_BOOTMEM
 170         select OLD_SIGACTION
 171         select OLD_SIGSUSPEND3
 172         select SPARSE_IRQ
 173         select SYSCTL_EXCEPTION_TRACE
 174         select THREAD_INFO_IN_TASK
 175         select TTY
 176         select VIRT_CPU_ACCOUNTING
 177         select ARCH_HAS_SCALED_CPUTIME
 178         select VIRT_TO_BUS
 179         select HAVE_NMI
 180
 181
 182 config SCHED_OMIT_FRAME_POINTER
 183         def_bool y
 184
 185 config PGTABLE_LEVELS
 186         int
 187         default 4
 188
 189 source "init/Kconfig"
 190
 191 source "kernel/Kconfig.freezer"
 192
 193 source "kernel/livepatch/Kconfig"
 194
 195 menu "Processor type and features"
 196
 197 config HAVE_MARCH_Z900_FEATURES
 198         def_bool n
 199
 200 config HAVE_MARCH_Z990_FEATURES
 201         def_bool n
 202         select HAVE_MARCH_Z900_FEATURES
 203
 204 config HAVE_MARCH_Z9_109_FEATURES
 205         def_bool n
 206         select HAVE_MARCH_Z990_FEATURES
 207
 208 config HAVE_MARCH_Z10_FEATURES
 209         def_bool n
 210         select HAVE_MARCH_Z9_109_FEATURES
 211
 212 config HAVE_MARCH_Z196_FEATURES
 213         def_bool n
 214         select HAVE_MARCH_Z10_FEATURES
 215
 216 config HAVE_MARCH_ZEC12_FEATURES
 217         def_bool n
 218         select HAVE_MARCH_Z196_FEATURES
 219
 220 config HAVE_MARCH_Z13_FEATURES
 221         def_bool n
 222         select HAVE_MARCH_ZEC12_FEATURES
 223
 224 choice
 225         prompt "Processor type"
 226         default MARCH_Z196
 227
 228 config MARCH_Z900
 229         bool "IBM zSeries model z800 and z900"
 230         select HAVE_MARCH_Z900_FEATURES
 231         help
 232           Select this to enable optimizations for model z800/z900 (2064 and
 233           2066 series). This will enable some optimizations that are not
 234           available on older ESA/390 (31 Bit) only CPUs.
 235
 236 config MARCH_Z990
 237         bool "IBM zSeries model z890 and z990"
 238         select HAVE_MARCH_Z990_FEATURES
 239         help
 240           Select this to enable optimizations for model z890/z990 (2084 and
 241           2086 series). The kernel will be slightly faster but will not work
 242           on older machines.
 243
 244 config MARCH_Z9_109
 245         bool "IBM System z9"
 246         select HAVE_MARCH_Z9_109_FEATURES
 247         help
 248           Select this to enable optimizations for IBM System z9 (2094 and
 249           2096 series). The kernel will be slightly faster but will not work
 250           on older machines.
 251
 252 config MARCH_Z10
 253         bool "IBM System z10"
 254         select HAVE_MARCH_Z10_FEATURES
 255         help
 256           Select this to enable optimizations for IBM System z10 (2097 and
 257           2098 series). The kernel will be slightly faster but will not work
 258           on older machines.
 259
 260 config MARCH_Z196
 261         bool "IBM zEnterprise 114 and 196"
 262         select HAVE_MARCH_Z196_FEATURES
 263         help
 264           Select this to enable optimizations for IBM zEnterprise 114 and 196
 265           (2818 and 2817 series). The kernel will be slightly faster but will
 266           not work on older machines.
 267
 268 config MARCH_ZEC12
 269         bool "IBM zBC12 and zEC12"
 270         select HAVE_MARCH_ZEC12_FEATURES
 271         help
 272           Select this to enable optimizations for IBM zBC12 and zEC12 (2828 and
 273           2827 series). The kernel will be slightly faster but will not work on
 274           older machines.
 275
 276 config MARCH_Z13
 277         bool "IBM z13s and z13"
 278         select HAVE_MARCH_Z13_FEATURES
 279         help
 280           Select this to enable optimizations for IBM z13s and z13 (2965 and
 281           2964 series). The kernel will be slightly faster but will not work on
 282           older machines.
 283
 284 endchoice
 285
 286 config MARCH_Z900_TUNE
 287         def_bool TUNE_Z900 || MARCH_Z900 && TUNE_DEFAULT
 288
 289 config MARCH_Z990_TUNE
 290         def_bool TUNE_Z990 || MARCH_Z990 && TUNE_DEFAULT
 291
 292 config MARCH_Z9_109_TUNE
 293         def_bool TUNE_Z9_109 || MARCH_Z9_109 && TUNE_DEFAULT
 294
 295 config MARCH_Z10_TUNE
 296         def_bool TUNE_Z10 || MARCH_Z10 && TUNE_DEFAULT
 297
 298 config MARCH_Z196_TUNE
 299         def_bool TUNE_Z196 || MARCH_Z196 && TUNE_DEFAULT
 300
 301 config MARCH_ZEC12_TUNE
 302         def_bool TUNE_ZEC12 || MARCH_ZEC12 && TUNE_DEFAULT
 303
 304 config MARCH_Z13_TUNE
 305         def_bool TUNE_Z13 || MARCH_Z13 && TUNE_DEFAULT
 306
 307 choice
 308         prompt "Tune code generation"
 309         default TUNE_DEFAULT
 310         help
 311           Cause the compiler to tune (-mtune) the generated code for a machine.
 312           This will make the code run faster on the selected machine but
 313           somewhat slower on other machines.
 314           This option only changes how the compiler emits instructions, not the
 315           selection of instructions itself, so the resulting kernel will run on
 316           all other machines.
 317
 318 config TUNE_DEFAULT
 319         bool "Default"
 320         help
 321           Tune the generated code for the target processor for which the kernel
 322           will be compiled.
 323
 324 config TUNE_Z900
 325         bool "IBM zSeries model z800 and z900"
 326
 327 config TUNE_Z990
 328         bool "IBM zSeries model z890 and z990"
 329
 330 config TUNE_Z9_109
 331         bool "IBM System z9"
 332
 333 config TUNE_Z10
 334         bool "IBM System z10"
 335
 336 config TUNE_Z196
 337         bool "IBM zEnterprise 114 and 196"
 338
 339 config TUNE_ZEC12
 340         bool "IBM zBC12 and zEC12"
 341
 342 config TUNE_Z13
 343         bool "IBM z13"
 344
 345 endchoice
 346
 347 config 64BIT
 348         def_bool y
 349
 350 config COMPAT
 351         def_bool y
 352         prompt "Kernel support for 31 bit emulation"
 353         select COMPAT_BINFMT_ELF if BINFMT_ELF
 354         select ARCH_WANT_OLD_COMPAT_IPC
 355         select COMPAT_OLD_SIGACTION
 356         depends on MULTIUSER
 357         help
 358           Select this option if you want to enable your system kernel to
 359           handle system-calls from ELF binaries for 31 bit ESA.  This option
 360           (and some other stuff like libraries and such) is needed for
 361           executing 31 bit applications.  It is safe to say "Y".
 362
 363 config SYSVIPC_COMPAT
 364         def_bool y if COMPAT && SYSVIPC
 365
 366 config SMP
 367         def_bool y
 368         prompt "Symmetric multi-processing support"
 369         ---help---
 370           This enables support for systems with more than one CPU. If you have
 371           a system with only one CPU, like most personal computers, say N. If
 372           you have a system with more than one CPU, say Y.
 373
 374           If you say N here, the kernel will run on uni- and multiprocessor
 375           machines, but will use only one CPU of a multiprocessor machine. If
 376           you say Y here, the kernel will run on many, but not all,
 377           uniprocessor machines. On a uniprocessor machine, the kernel
 378           will run faster if you say N here.
 379
 380           See also the SMP-HOWTO available at
 381           <http://www.tldp.org/docs.html#howto>.
 382
 383           Even if you don't know what to do here, say Y.
 384
 385 config NR_CPUS
 386         int "Maximum number of CPUs (2-512)"
 387         range 2 512
 388         depends on SMP
 389         default "64"
 390         help
 391           This allows you to specify the maximum number of CPUs which this
 392           kernel will support. The maximum supported value is 512 and the
 393           minimum value which makes sense is 2.
 394
 395           This is purely to save memory - each supported CPU adds
 396           approximately sixteen kilobytes to the kernel image.
 397
 398 config HOTPLUG_CPU
 399         def_bool y
 400         prompt "Support for hot-pluggable CPUs"
 401         depends on SMP
 402         help
 403           Say Y here to be able to turn CPUs off and on. CPUs
 404           can be controlled through /sys/devices/system/cpu/cpu#.
 405           Say N if you want to disable CPU hotplug.
 406
 407 # Some NUMA nodes have memory ranges that span
 408 # other nodes.  Even though a pfn is valid and
 409 # between a node's start and end pfns, it may not
 410 # reside on that node.  See memmap_init_zone()
 411 # for details. <- They meant memory holes!
 412 config NODES_SPAN_OTHER_NODES
 413         def_bool NUMA
 414
 415 config NUMA
 416         bool "NUMA support"
 417         depends on SMP && SCHED_TOPOLOGY
 418         default n
 419         help
 420           Enable NUMA support
 421
 422           This option adds NUMA support to the kernel.
 423
 424           An operation mode can be selected by appending
 425           numa=<method> to the kernel command line.
 426
 427           The default behaviour is identical to appending numa=plain to
 428           the command line. This will create just one node with all
 429           available memory and all CPUs in it.
 430
 431 config NODES_SHIFT
 432         int "Maximum NUMA nodes (as a power of 2)"
 433         range 1 10
 434         depends on NUMA
 435         default "4"
 436         help
 437           Specify the maximum number of NUMA nodes available on the target
 438           system. Increases memory reserved to accommodate various tables.
 439
 440 menu "Select NUMA modes"
 441         depends on NUMA
 442
 443 config NUMA_EMU
 444         bool "NUMA emulation"
 445         default y
 446         help
 447           Numa emulation mode will split the available system memory into
 448           equal chunks which then are distributed over the configured number
 449           of nodes in a round-robin manner.
 450
 451           The number of fake nodes is limited by the number of available memory
 452           chunks (i.e. memory size / fake size) and the number of supported
 453           nodes in the kernel.
 454
 455           The CPUs are assigned to the nodes in a way that partially respects
 456           the original machine topology (if supported by the machine).
 457           Fair distribution of the CPUs is not guaranteed.
 458
 459 config EMU_SIZE
 460         hex "NUMA emulation memory chunk size"
 461         default 0x10000000
 462         range 0x400000 0x100000000
 463         depends on NUMA_EMU
 464         help
 465           Select the default size by which the memory is chopped and then
 466           assigned to emulated NUMA nodes.
 467
 468           This can be overridden by specifying
 469
 470           emu_size=<n>
 471
 472           on the kernel command line where also suffixes K, M, G, and T are
 473           supported.
 474
 475 endmenu
 476
 477 config SCHED_SMT
 478         def_bool n
 479
 480 config SCHED_MC
 481         def_bool n
 482
 483 config SCHED_BOOK
 484         def_bool n
 485
 486 config SCHED_DRAWER
 487         def_bool n
 488
 489 config SCHED_TOPOLOGY
 490         def_bool y
 491         prompt "Topology scheduler support"
 492         depends on SMP
 493         select SCHED_SMT
 494         select SCHED_MC
 495         select SCHED_BOOK
 496         select SCHED_DRAWER
 497         help
 498           Topology scheduler support improves the CPU scheduler's decision
 499           making when dealing with machines that have multi-threading,
 500           multiple cores or multiple books.
 501
 502 source kernel/Kconfig.preempt
 503
 504 source kernel/Kconfig.hz
 505
 506 config ARCH_RANDOM
 507         def_bool y
 508         prompt "s390 architectural random number generation API"
 509         help
 510           Enable the s390 architectural random number generation API
 511           to provide random data for all consumers within the Linux
 512           kernel.
 513
 514           When enabled the arch_random_* functions declared in linux/random.h
 515           are implemented. The implementation is based on the s390 CPACF
 516           instruction subfunction TRNG which provides a real true random
 517           number generator.
 518
 519           If unsure, say Y.
 520
 521 endmenu
 522
 523 menu "Memory setup"
 524
 525 config ARCH_SPARSEMEM_ENABLE
 526         def_bool y
 527         select SPARSEMEM_VMEMMAP_ENABLE
 528         select SPARSEMEM_VMEMMAP
 529
 530 config ARCH_SPARSEMEM_DEFAULT
 531         def_bool y
 532
 533 config ARCH_SELECT_MEMORY_MODEL
 534         def_bool y
 535
 536 config ARCH_ENABLE_MEMORY_HOTPLUG
 537         def_bool y if SPARSEMEM
 538
 539 config ARCH_ENABLE_MEMORY_HOTREMOVE
 540         def_bool y
 541
 542 config ARCH_ENABLE_SPLIT_PMD_PTLOCK
 543         def_bool y
 544
 545 config FORCE_MAX_ZONEORDER
 546         int
 547         default "9"
 548
 549 source "mm/Kconfig"
 550
 551 config MAX_PHYSMEM_BITS
 552         int "Maximum size of supported physical memory in bits (42-53)"
 553         range 42 53
 554         default "46"
 555         help
 556           This option specifies the maximum supported size of physical memory
 557           in bits. Supported is any size between 2^42 (4TB) and 2^53 (8PB).
 558           Increasing the number of bits also increases the kernel image size.
 559           By default 46 bits (64TB) are supported.
 560
 561 config PACK_STACK
 562         def_bool y
 563         prompt "Pack kernel stack"
 564         help
 565           This option enables the compiler option -mkernel-backchain if it
 566           is available. If the option is available the compiler supports
 567           the new stack layout which dramatically reduces the minimum stack
 568           frame size. With an old compiler a non-leaf function needs a
 569           minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
 570           -mkernel-backchain the minimum size drops to 16 byte on 31 bit
 571           and 24 byte on 64 bit.
 572
 573           Say Y if you are unsure.
 574
 575 config CHECK_STACK
 576         def_bool y
 577         prompt "Detect kernel stack overflow"
 578         help
 579           This option enables the compiler option -mstack-guard and
 580           -mstack-size if they are available. If the compiler supports them
 581           it will emit additional code to each function prolog to trigger
 582           an illegal operation if the kernel stack is about to overflow.
 583
 584           Say N if you are unsure.
 585
 586 config STACK_GUARD
 587         int "Size of the guard area (128-1024)"
 588         range 128 1024
 589         depends on CHECK_STACK
 590         default "256"
 591         help
 592           This allows you to specify the size of the guard area at the lower
 593           end of the kernel stack. If the kernel stack points into the guard
 594           area on function entry an illegal operation is triggered. The size
 595           needs to be a power of 2. Please keep in mind that the size of an
 596           interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
 597           The minimum size for the stack guard should be 256 for 31 bit and
 598           512 for 64 bit.
 599
 600 config WARN_DYNAMIC_STACK
 601         def_bool n
 602         prompt "Emit compiler warnings for function with dynamic stack usage"
 603         help
 604           This option enables the compiler option -mwarn-dynamicstack. If the
 605           compiler supports this options generates warnings for functions
 606           that dynamically allocate stack space using alloca.
 607
 608           Say N if you are unsure.
 609
 610 endmenu
 611
 612 menu "I/O subsystem"
 613
 614 config QDIO
 615         def_tristate y
 616         prompt "QDIO support"
 617         ---help---
 618           This driver provides the Queued Direct I/O base support for
 619           IBM System z.
 620
 621           To compile this driver as a module, choose M here: the
 622           module will be called qdio.
 623
 624           If unsure, say Y.
 625
 626 menuconfig PCI
 627         bool "PCI support"
 628         select PCI_MSI
 629         select IOMMU_SUPPORT
 630         help
 631           Enable PCI support.
 632
 633 if PCI
 634
 635 config PCI_NR_FUNCTIONS
 636         int "Maximum number of PCI functions (1-4096)"
 637         range 1 4096
 638         default "128"
 639         help
 640           This allows you to specify the maximum number of PCI functions which
 641           this kernel will support.
 642
 643 source "drivers/pci/Kconfig"
 644
 645 endif   # PCI
 646
 647 config PCI_DOMAINS
 648         def_bool PCI
 649
 650 config HAS_IOMEM
 651         def_bool PCI
 652
 653 config IOMMU_HELPER
 654         def_bool PCI
 655
 656 config NEED_SG_DMA_LENGTH
 657         def_bool PCI
 658
 659 config NEED_DMA_MAP_STATE
 660         def_bool PCI
 661
 662 config CHSC_SCH
 663         def_tristate m
 664         prompt "Support for CHSC subchannels"
 665         help
 666           This driver allows usage of CHSC subchannels. A CHSC subchannel
 667           is usually present on LPAR only.
 668           The driver creates a device /dev/chsc, which may be used to
 669           obtain I/O configuration information about the machine and
 670           to issue asynchronous chsc commands (DANGEROUS).
 671           You will usually only want to use this interface on a special
 672           LPAR designated for system management.
 673
 674           To compile this driver as a module, choose M here: the
 675           module will be called chsc_sch.
 676
 677           If unsure, say N.
 678
 679 config SCM_BUS
 680         def_bool y
 681         prompt "SCM bus driver"
 682         help
 683           Bus driver for Storage Class Memory.
 684
 685 config EADM_SCH
 686         def_tristate m
 687         prompt "Support for EADM subchannels"
 688         depends on SCM_BUS
 689         help
 690           This driver allows usage of EADM subchannels. EADM subchannels act
 691           as a communication vehicle for SCM increments.
 692
 693           To compile this driver as a module, choose M here: the
 694           module will be called eadm_sch.
 695
 696 config VFIO_CCW
 697         def_tristate n
 698         prompt "Support for VFIO-CCW subchannels"
 699         depends on S390_CCW_IOMMU && VFIO_MDEV
 700         help
 701           This driver allows usage of I/O subchannels via VFIO-CCW.
 702
 703           To compile this driver as a module, choose M here: the
 704           module will be called vfio_ccw.
 705
 706 endmenu
 707
 708 menu "Dump support"
 709
 710 config CRASH_DUMP
 711         bool "kernel crash dumps"
 712         depends on SMP
 713         select KEXEC
 714         help
 715           Generate crash dump after being started by kexec.
 716           Crash dump kernels are loaded in the main kernel with kexec-tools
 717           into a specially reserved region and then later executed after
 718           a crash by kdump/kexec.
 719           Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this.
 720           This option also enables s390 zfcpdump.
 721           See also <file:Documentation/s390/zfcpdump.txt>
 722
 723 endmenu
 724
 725 menu "Executable file formats / Emulations"
 726
 727 source "fs/Kconfig.binfmt"
 728
 729 config SECCOMP
 730         def_bool y
 731         prompt "Enable seccomp to safely compute untrusted bytecode"
 732         depends on PROC_FS
 733         help
 734           This kernel feature is useful for number crunching applications
 735           that may need to compute untrusted bytecode during their
 736           execution. By using pipes or other transports made available to
 737           the process as file descriptors supporting the read/write
 738           syscalls, it's possible to isolate those applications in
 739           their own address space using seccomp. Once seccomp is
 740           enabled via /proc/<pid>/seccomp, it cannot be disabled
 741           and the task is only allowed to execute a few safe syscalls
 742           defined by each seccomp mode.
 743
 744           If unsure, say Y.
 745
 746 endmenu
 747
 748 menu "Power Management"
 749
 750 config ARCH_HIBERNATION_POSSIBLE
 751         def_bool y
 752
 753 source "kernel/power/Kconfig"
 754
 755 endmenu
 756
 757 source "net/Kconfig"
 758
 759 config PCMCIA
 760         def_bool n
 761
 762 config CCW
 763         def_bool y
 764
 765 source "drivers/Kconfig"
 766
 767 source "fs/Kconfig"
 768
 769 source "arch/s390/Kconfig.debug"
 770
 771 source "security/Kconfig"
 772
 773 source "crypto/Kconfig"
 774
 775 source "lib/Kconfig"
 776
 777 menu "Virtualization"
 778
 779 config PFAULT
 780         def_bool y
 781         prompt "Pseudo page fault support"
 782         help
 783           Select this option, if you want to use PFAULT pseudo page fault
 784           handling under VM. If running native or in LPAR, this option
 785           has no effect. If your VM does not support PFAULT, PAGEEX
 786           pseudo page fault handling will be used.
 787           Note that VM 4.2 supports PFAULT but has a bug in its
 788           implementation that causes some problems.
 789           Everybody who wants to run Linux under VM != VM4.2 should select
 790           this option.
 791
 792 config SHARED_KERNEL
 793         bool "VM shared kernel support"
 794         depends on !JUMP_LABEL
 795         help
 796           Select this option, if you want to share the text segment of the
 797           Linux kernel between different VM guests. This reduces memory
 798           usage with lots of guests but greatly increases kernel size.
 799           Also if a kernel was IPL'ed from a shared segment the kexec system
 800           call will not work.
 801           You should only select this option if you know what you are
 802           doing and want to exploit this feature.
 803
 804 config CMM
 805         def_tristate n
 806         prompt "Cooperative memory management"
 807         help
 808           Select this option, if you want to enable the kernel interface
 809           to reduce the memory size of the system. This is accomplished
 810           by allocating pages of memory and put them "on hold". This only
 811           makes sense for a system running under VM where the unused pages
 812           will be reused by VM for other guest systems. The interface
 813           allows an external monitor to balance memory of many systems.
 814           Everybody who wants to run Linux under VM should select this
 815           option.
 816
 817 config CMM_IUCV
 818         def_bool y
 819         prompt "IUCV special message interface to cooperative memory management"
 820         depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
 821         help
 822           Select this option to enable the special message interface to
 823           the cooperative memory management.
 824
 825 config APPLDATA_BASE
 826         def_bool n
 827         prompt "Linux - VM Monitor Stream, base infrastructure"
 828         depends on PROC_FS
 829         help
 830           This provides a kernel interface for creating and updating z/VM APPLDATA
 831           monitor records. The monitor records are updated at certain time
 832           intervals, once the timer is started.
 833           Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
 834           i.e. enables or disables monitoring on the Linux side.
 835           A custom interval value (in seconds) can be written to
 836           /proc/appldata/interval.
 837
 838           Defaults are 60 seconds interval and timer off.
 839           The /proc entries can also be read from, showing the current settings.
 840
 841 config APPLDATA_MEM
 842         def_tristate m
 843         prompt "Monitor memory management statistics"
 844         depends on APPLDATA_BASE && VM_EVENT_COUNTERS
 845         help
 846           This provides memory management related data to the Linux - VM Monitor
 847           Stream, like paging/swapping rate, memory utilisation, etc.
 848           Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
 849           APPLDATA monitor record, i.e. enables or disables monitoring this record
 850           on the z/VM side.
 851
 852           Default is disabled.
 853           The /proc entry can also be read from, showing the current settings.
 854
 855           This can also be compiled as a module, which will be called
 856           appldata_mem.o.
 857
 858 config APPLDATA_OS
 859         def_tristate m
 860         prompt "Monitor OS statistics"
 861         depends on APPLDATA_BASE
 862         help
 863           This provides OS related data to the Linux - VM Monitor Stream, like
 864           CPU utilisation, etc.
 865           Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
 866           APPLDATA monitor record, i.e. enables or disables monitoring this record
 867           on the z/VM side.
 868
 869           Default is disabled.
 870           This can also be compiled as a module, which will be called
 871           appldata_os.o.
 872
 873 config APPLDATA_NET_SUM
 874         def_tristate m
 875         prompt "Monitor overall network statistics"
 876         depends on APPLDATA_BASE && NET
 877         help
 878           This provides network related data to the Linux - VM Monitor Stream,
 879           currently there is only a total sum of network I/O statistics, no
 880           per-interface data.
 881           Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
 882           APPLDATA monitor record, i.e. enables or disables monitoring this record
 883           on the z/VM side.
 884
 885           Default is disabled.
 886           This can also be compiled as a module, which will be called
 887           appldata_net_sum.o.
 888
 889 config S390_HYPFS_FS
 890         def_bool y
 891         prompt "s390 hypervisor file system support"
 892         select SYS_HYPERVISOR
 893         help
 894           This is a virtual file system intended to provide accounting
 895           information in an s390 hypervisor environment.
 896
 897 source "arch/s390/kvm/Kconfig"
 898
 899 config S390_GUEST
 900         def_bool y
 901         prompt "s390 support for virtio devices"
 902         select TTY
 903         select VIRTUALIZATION
 904         select VIRTIO
 905         select VIRTIO_CONSOLE
 906         help
 907           Enabling this option adds support for virtio based paravirtual device
 908           drivers on s390.
 909
 910           Select this option if you want to run the kernel as a guest under
 911           the KVM hypervisor.
 912
 913 config S390_GUEST_OLD_TRANSPORT
 914         def_bool y
 915         prompt "Guest support for old s390 virtio transport (DEPRECATED)"
 916         depends on S390_GUEST
 917         help
 918           Enable this option to add support for the old s390-virtio
 919           transport (i.e. virtio devices NOT based on virtio-ccw). This
 920           type of virtio devices is only available on the experimental
 921           kuli userspace or with old (< 2.6) qemu. If you are running
 922           with a modern version of qemu (which supports virtio-ccw since
 923           1.4 and uses it by default since version 2.4), you probably won't
 924           need this.
 925
 926 endmenu