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 DEBUG_RODATA
  66         def_bool y
  67
  68 config S390
  69         def_bool y
  70         select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
  71         select ARCH_HAS_DEVMEM_IS_ALLOWED
  72         select ARCH_HAS_ELF_RANDOMIZE
  73         select ARCH_HAS_GCOV_PROFILE_ALL
  74         select ARCH_HAS_KCOV
  75         select ARCH_HAS_SG_CHAIN
  76         select ARCH_HAVE_NMI_SAFE_CMPXCHG
  77         select ARCH_INLINE_READ_LOCK
  78         select ARCH_INLINE_READ_LOCK_BH
  79         select ARCH_INLINE_READ_LOCK_IRQ
  80         select ARCH_INLINE_READ_LOCK_IRQSAVE
  81         select ARCH_INLINE_READ_TRYLOCK
  82         select ARCH_INLINE_READ_UNLOCK
  83         select ARCH_INLINE_READ_UNLOCK_BH
  84         select ARCH_INLINE_READ_UNLOCK_IRQ
  85         select ARCH_INLINE_READ_UNLOCK_IRQRESTORE
  86         select ARCH_INLINE_SPIN_LOCK
  87         select ARCH_INLINE_SPIN_LOCK_BH
  88         select ARCH_INLINE_SPIN_LOCK_IRQ
  89         select ARCH_INLINE_SPIN_LOCK_IRQSAVE
  90         select ARCH_INLINE_SPIN_TRYLOCK
  91         select ARCH_INLINE_SPIN_TRYLOCK_BH
  92         select ARCH_INLINE_SPIN_UNLOCK
  93         select ARCH_INLINE_SPIN_UNLOCK_BH
  94         select ARCH_INLINE_SPIN_UNLOCK_IRQ
  95         select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE
  96         select ARCH_INLINE_WRITE_LOCK
  97         select ARCH_INLINE_WRITE_LOCK_BH
  98         select ARCH_INLINE_WRITE_LOCK_IRQ
  99         select ARCH_INLINE_WRITE_LOCK_IRQSAVE
 100         select ARCH_INLINE_WRITE_TRYLOCK
 101         select ARCH_INLINE_WRITE_UNLOCK
 102         select ARCH_INLINE_WRITE_UNLOCK_BH
 103         select ARCH_INLINE_WRITE_UNLOCK_IRQ
 104         select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE
 105         select ARCH_SAVE_PAGE_KEYS if HIBERNATION
 106         select ARCH_SUPPORTS_ATOMIC_RMW
 107         select ARCH_SUPPORTS_NUMA_BALANCING
 108         select ARCH_USE_BUILTIN_BSWAP
 109         select ARCH_USE_CMPXCHG_LOCKREF
 110         select ARCH_WANTS_DYNAMIC_TASK_STRUCT
 111         select ARCH_WANTS_PROT_NUMA_PROT_NONE
 112         select ARCH_WANT_IPC_PARSE_VERSION
 113         select BUILDTIME_EXTABLE_SORT
 114         select CLONE_BACKWARDS2
 115         select DYNAMIC_FTRACE if FUNCTION_TRACER
 116         select GENERIC_CLOCKEVENTS
 117         select GENERIC_CPU_AUTOPROBE
 118         select GENERIC_CPU_DEVICES if !SMP
 119         select GENERIC_FIND_FIRST_BIT
 120         select GENERIC_SMP_IDLE_THREAD
 121         select GENERIC_TIME_VSYSCALL
 122         select HAVE_ALIGNED_STRUCT_PAGE if SLUB
 123         select HAVE_ARCH_AUDITSYSCALL
 124         select HAVE_ARCH_EARLY_PFN_TO_NID
 125         select HAVE_ARCH_HARDENED_USERCOPY
 126         select HAVE_ARCH_JUMP_LABEL
 127         select CPU_NO_EFFICIENT_FFS if !HAVE_MARCH_Z9_109_FEATURES
 128         select HAVE_ARCH_SECCOMP_FILTER
 129         select HAVE_ARCH_SOFT_DIRTY
 130         select HAVE_ARCH_TRACEHOOK
 131         select HAVE_ARCH_TRANSPARENT_HUGEPAGE
 132         select HAVE_EBPF_JIT if PACK_STACK && HAVE_MARCH_Z196_FEATURES
 133         select HAVE_CMPXCHG_DOUBLE
 134         select HAVE_CMPXCHG_LOCAL
 135         select HAVE_DEBUG_KMEMLEAK
 136         select HAVE_DMA_API_DEBUG
 137         select HAVE_DYNAMIC_FTRACE
 138         select HAVE_DYNAMIC_FTRACE_WITH_REGS
 139         select HAVE_EXIT_THREAD
 140         select HAVE_FTRACE_MCOUNT_RECORD
 141         select HAVE_FUNCTION_GRAPH_TRACER
 142         select HAVE_FUNCTION_TRACER
 143         select HAVE_FUTEX_CMPXCHG if FUTEX
 144         select HAVE_KERNEL_BZIP2
 145         select HAVE_KERNEL_GZIP
 146         select HAVE_KERNEL_LZ4
 147         select HAVE_KERNEL_LZMA
 148         select HAVE_KERNEL_LZO
 149         select HAVE_KERNEL_XZ
 150         select HAVE_KPROBES
 151         select HAVE_KRETPROBES
 152         select HAVE_KVM
 153         select HAVE_LIVEPATCH
 154         select HAVE_MEMBLOCK
 155         select HAVE_MEMBLOCK_NODE_MAP
 156         select HAVE_MEMBLOCK_PHYS_MAP
 157         select HAVE_MOD_ARCH_SPECIFIC
 158         select HAVE_OPROFILE
 159         select HAVE_PERF_EVENTS
 160         select HAVE_REGS_AND_STACK_ACCESS_API
 161         select HAVE_SYSCALL_TRACEPOINTS
 162         select HAVE_VIRT_CPU_ACCOUNTING
 163         select MODULES_USE_ELF_RELA
 164         select NO_BOOTMEM
 165         select OLD_SIGACTION
 166         select OLD_SIGSUSPEND3
 167         select SPARSE_IRQ
 168         select SYSCTL_EXCEPTION_TRACE
 169         select TTY
 170         select VIRT_CPU_ACCOUNTING
 171         select VIRT_TO_BUS
 172         select HAVE_NMI
 173
 174
 175 config SCHED_OMIT_FRAME_POINTER
 176         def_bool y
 177
 178 config PGTABLE_LEVELS
 179         int
 180         default 4
 181
 182 source "init/Kconfig"
 183
 184 source "kernel/Kconfig.freezer"
 185
 186 source "kernel/livepatch/Kconfig"
 187
 188 menu "Processor type and features"
 189
 190 config HAVE_MARCH_Z900_FEATURES
 191         def_bool n
 192
 193 config HAVE_MARCH_Z990_FEATURES
 194         def_bool n
 195         select HAVE_MARCH_Z900_FEATURES
 196
 197 config HAVE_MARCH_Z9_109_FEATURES
 198         def_bool n
 199         select HAVE_MARCH_Z990_FEATURES
 200
 201 config HAVE_MARCH_Z10_FEATURES
 202         def_bool n
 203         select HAVE_MARCH_Z9_109_FEATURES
 204
 205 config HAVE_MARCH_Z196_FEATURES
 206         def_bool n
 207         select HAVE_MARCH_Z10_FEATURES
 208
 209 config HAVE_MARCH_ZEC12_FEATURES
 210         def_bool n
 211         select HAVE_MARCH_Z196_FEATURES
 212
 213 config HAVE_MARCH_Z13_FEATURES
 214         def_bool n
 215         select HAVE_MARCH_ZEC12_FEATURES
 216
 217 choice
 218         prompt "Processor type"
 219         default MARCH_Z196
 220
 221 config MARCH_Z900
 222         bool "IBM zSeries model z800 and z900"
 223         select HAVE_MARCH_Z900_FEATURES
 224         help
 225           Select this to enable optimizations for model z800/z900 (2064 and
 226           2066 series). This will enable some optimizations that are not
 227           available on older ESA/390 (31 Bit) only CPUs.
 228
 229 config MARCH_Z990
 230         bool "IBM zSeries model z890 and z990"
 231         select HAVE_MARCH_Z990_FEATURES
 232         help
 233           Select this to enable optimizations for model z890/z990 (2084 and
 234           2086 series). The kernel will be slightly faster but will not work
 235           on older machines.
 236
 237 config MARCH_Z9_109
 238         bool "IBM System z9"
 239         select HAVE_MARCH_Z9_109_FEATURES
 240         help
 241           Select this to enable optimizations for IBM System z9 (2094 and
 242           2096 series). The kernel will be slightly faster but will not work
 243           on older machines.
 244
 245 config MARCH_Z10
 246         bool "IBM System z10"
 247         select HAVE_MARCH_Z10_FEATURES
 248         help
 249           Select this to enable optimizations for IBM System z10 (2097 and
 250           2098 series). The kernel will be slightly faster but will not work
 251           on older machines.
 252
 253 config MARCH_Z196
 254         bool "IBM zEnterprise 114 and 196"
 255         select HAVE_MARCH_Z196_FEATURES
 256         help
 257           Select this to enable optimizations for IBM zEnterprise 114 and 196
 258           (2818 and 2817 series). The kernel will be slightly faster but will
 259           not work on older machines.
 260
 261 config MARCH_ZEC12
 262         bool "IBM zBC12 and zEC12"
 263         select HAVE_MARCH_ZEC12_FEATURES
 264         help
 265           Select this to enable optimizations for IBM zBC12 and zEC12 (2828 and
 266           2827 series). The kernel will be slightly faster but will not work on
 267           older machines.
 268
 269 config MARCH_Z13
 270         bool "IBM z13s and z13"
 271         select HAVE_MARCH_Z13_FEATURES
 272         help
 273           Select this to enable optimizations for IBM z13s and z13 (2965 and
 274           2964 series). The kernel will be slightly faster but will not work on
 275           older machines.
 276
 277 endchoice
 278
 279 config MARCH_Z900_TUNE
 280         def_bool TUNE_Z900 || MARCH_Z900 && TUNE_DEFAULT
 281
 282 config MARCH_Z990_TUNE
 283         def_bool TUNE_Z990 || MARCH_Z990 && TUNE_DEFAULT
 284
 285 config MARCH_Z9_109_TUNE
 286         def_bool TUNE_Z9_109 || MARCH_Z9_109 && TUNE_DEFAULT
 287
 288 config MARCH_Z10_TUNE
 289         def_bool TUNE_Z10 || MARCH_Z10 && TUNE_DEFAULT
 290
 291 config MARCH_Z196_TUNE
 292         def_bool TUNE_Z196 || MARCH_Z196 && TUNE_DEFAULT
 293
 294 config MARCH_ZEC12_TUNE
 295         def_bool TUNE_ZEC12 || MARCH_ZEC12 && TUNE_DEFAULT
 296
 297 config MARCH_Z13_TUNE
 298         def_bool TUNE_Z13 || MARCH_Z13 && TUNE_DEFAULT
 299
 300 choice
 301         prompt "Tune code generation"
 302         default TUNE_DEFAULT
 303         help
 304           Cause the compiler to tune (-mtune) the generated code for a machine.
 305           This will make the code run faster on the selected machine but
 306           somewhat slower on other machines.
 307           This option only changes how the compiler emits instructions, not the
 308           selection of instructions itself, so the resulting kernel will run on
 309           all other machines.
 310
 311 config TUNE_DEFAULT
 312         bool "Default"
 313         help
 314           Tune the generated code for the target processor for which the kernel
 315           will be compiled.
 316
 317 config TUNE_Z900
 318         bool "IBM zSeries model z800 and z900"
 319
 320 config TUNE_Z990
 321         bool "IBM zSeries model z890 and z990"
 322
 323 config TUNE_Z9_109
 324         bool "IBM System z9"
 325
 326 config TUNE_Z10
 327         bool "IBM System z10"
 328
 329 config TUNE_Z196
 330         bool "IBM zEnterprise 114 and 196"
 331
 332 config TUNE_ZEC12
 333         bool "IBM zBC12 and zEC12"
 334
 335 config TUNE_Z13
 336         bool "IBM z13"
 337
 338 endchoice
 339
 340 config 64BIT
 341         def_bool y
 342
 343 config COMPAT
 344         def_bool y
 345         prompt "Kernel support for 31 bit emulation"
 346         select COMPAT_BINFMT_ELF if BINFMT_ELF
 347         select ARCH_WANT_OLD_COMPAT_IPC
 348         select COMPAT_OLD_SIGACTION
 349         depends on MULTIUSER
 350         help
 351           Select this option if you want to enable your system kernel to
 352           handle system-calls from ELF binaries for 31 bit ESA.  This option
 353           (and some other stuff like libraries and such) is needed for
 354           executing 31 bit applications.  It is safe to say "Y".
 355
 356 config SYSVIPC_COMPAT
 357         def_bool y if COMPAT && SYSVIPC
 358
 359 config KEYS_COMPAT
 360         def_bool y if COMPAT && KEYS
 361
 362 config SMP
 363         def_bool y
 364         prompt "Symmetric multi-processing support"
 365         ---help---
 366           This enables support for systems with more than one CPU. If you have
 367           a system with only one CPU, like most personal computers, say N. If
 368           you have a system with more than one CPU, say Y.
 369
 370           If you say N here, the kernel will run on uni- and multiprocessor
 371           machines, but will use only one CPU of a multiprocessor machine. If
 372           you say Y here, the kernel will run on many, but not all,
 373           uniprocessor machines. On a uniprocessor machine, the kernel
 374           will run faster if you say N here.
 375
 376           See also the SMP-HOWTO available at
 377           <http://www.tldp.org/docs.html#howto>.
 378
 379           Even if you don't know what to do here, say Y.
 380
 381 config NR_CPUS
 382         int "Maximum number of CPUs (2-512)"
 383         range 2 512
 384         depends on SMP
 385         default "64"
 386         help
 387           This allows you to specify the maximum number of CPUs which this
 388           kernel will support. The maximum supported value is 512 and the
 389           minimum value which makes sense is 2.
 390
 391           This is purely to save memory - each supported CPU adds
 392           approximately sixteen kilobytes to the kernel image.
 393
 394 config HOTPLUG_CPU
 395         def_bool y
 396         prompt "Support for hot-pluggable CPUs"
 397         depends on SMP
 398         help
 399           Say Y here to be able to turn CPUs off and on. CPUs
 400           can be controlled through /sys/devices/system/cpu/cpu#.
 401           Say N if you want to disable CPU hotplug.
 402
 403 # Some NUMA nodes have memory ranges that span
 404 # other nodes.  Even though a pfn is valid and
 405 # between a node's start and end pfns, it may not
 406 # reside on that node.  See memmap_init_zone()
 407 # for details. <- They meant memory holes!
 408 config NODES_SPAN_OTHER_NODES
 409         def_bool NUMA
 410
 411 config NUMA
 412         bool "NUMA support"
 413         depends on SMP && SCHED_TOPOLOGY
 414         default n
 415         help
 416           Enable NUMA support
 417
 418           This option adds NUMA support to the kernel.
 419
 420           An operation mode can be selected by appending
 421           numa=<method> to the kernel command line.
 422
 423           The default behaviour is identical to appending numa=plain to
 424           the command line. This will create just one node with all
 425           available memory and all CPUs in it.
 426
 427 config NODES_SHIFT
 428         int "Maximum NUMA nodes (as a power of 2)"
 429         range 1 10
 430         depends on NUMA
 431         default "4"
 432         help
 433           Specify the maximum number of NUMA nodes available on the target
 434           system. Increases memory reserved to accommodate various tables.
 435
 436 menu "Select NUMA modes"
 437         depends on NUMA
 438
 439 config NUMA_EMU
 440         bool "NUMA emulation"
 441         default y
 442         help
 443           Numa emulation mode will split the available system memory into
 444           equal chunks which then are distributed over the configured number
 445           of nodes in a round-robin manner.
 446
 447           The number of fake nodes is limited by the number of available memory
 448           chunks (i.e. memory size / fake size) and the number of supported
 449           nodes in the kernel.
 450
 451           The CPUs are assigned to the nodes in a way that partially respects
 452           the original machine topology (if supported by the machine).
 453           Fair distribution of the CPUs is not guaranteed.
 454
 455 config EMU_SIZE
 456         hex "NUMA emulation memory chunk size"
 457         default 0x10000000
 458         range 0x400000 0x100000000
 459         depends on NUMA_EMU
 460         help
 461           Select the default size by which the memory is chopped and then
 462           assigned to emulated NUMA nodes.
 463
 464           This can be overridden by specifying
 465
 466           emu_size=<n>
 467
 468           on the kernel command line where also suffixes K, M, G, and T are
 469           supported.
 470
 471 endmenu
 472
 473 config SCHED_SMT
 474         def_bool n
 475
 476 config SCHED_MC
 477         def_bool n
 478
 479 config SCHED_BOOK
 480         def_bool n
 481
 482 config SCHED_DRAWER
 483         def_bool n
 484
 485 config SCHED_TOPOLOGY
 486         def_bool y
 487         prompt "Topology scheduler support"
 488         depends on SMP
 489         select SCHED_SMT
 490         select SCHED_MC
 491         select SCHED_BOOK
 492         select SCHED_DRAWER
 493         help
 494           Topology scheduler support improves the CPU scheduler's decision
 495           making when dealing with machines that have multi-threading,
 496           multiple cores or multiple books.
 497
 498 source kernel/Kconfig.preempt
 499
 500 source kernel/Kconfig.hz
 501
 502 endmenu
 503
 504 menu "Memory setup"
 505
 506 config ARCH_SPARSEMEM_ENABLE
 507         def_bool y
 508         select SPARSEMEM_VMEMMAP_ENABLE
 509         select SPARSEMEM_VMEMMAP
 510
 511 config ARCH_SPARSEMEM_DEFAULT
 512         def_bool y
 513
 514 config ARCH_SELECT_MEMORY_MODEL
 515         def_bool y
 516
 517 config ARCH_ENABLE_MEMORY_HOTPLUG
 518         def_bool y if SPARSEMEM
 519
 520 config ARCH_ENABLE_MEMORY_HOTREMOVE
 521         def_bool y
 522
 523 config ARCH_ENABLE_SPLIT_PMD_PTLOCK
 524         def_bool y
 525
 526 config FORCE_MAX_ZONEORDER
 527         int
 528         default "9"
 529
 530 source "mm/Kconfig"
 531
 532 config PACK_STACK
 533         def_bool y
 534         prompt "Pack kernel stack"
 535         help
 536           This option enables the compiler option -mkernel-backchain if it
 537           is available. If the option is available the compiler supports
 538           the new stack layout which dramatically reduces the minimum stack
 539           frame size. With an old compiler a non-leaf function needs a
 540           minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
 541           -mkernel-backchain the minimum size drops to 16 byte on 31 bit
 542           and 24 byte on 64 bit.
 543
 544           Say Y if you are unsure.
 545
 546 config CHECK_STACK
 547         def_bool y
 548         prompt "Detect kernel stack overflow"
 549         help
 550           This option enables the compiler option -mstack-guard and
 551           -mstack-size if they are available. If the compiler supports them
 552           it will emit additional code to each function prolog to trigger
 553           an illegal operation if the kernel stack is about to overflow.
 554
 555           Say N if you are unsure.
 556
 557 config STACK_GUARD
 558         int "Size of the guard area (128-1024)"
 559         range 128 1024
 560         depends on CHECK_STACK
 561         default "256"
 562         help
 563           This allows you to specify the size of the guard area at the lower
 564           end of the kernel stack. If the kernel stack points into the guard
 565           area on function entry an illegal operation is triggered. The size
 566           needs to be a power of 2. Please keep in mind that the size of an
 567           interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
 568           The minimum size for the stack guard should be 256 for 31 bit and
 569           512 for 64 bit.
 570
 571 config WARN_DYNAMIC_STACK
 572         def_bool n
 573         prompt "Emit compiler warnings for function with dynamic stack usage"
 574         help
 575           This option enables the compiler option -mwarn-dynamicstack. If the
 576           compiler supports this options generates warnings for functions
 577           that dynamically allocate stack space using alloca.
 578
 579           Say N if you are unsure.
 580
 581 endmenu
 582
 583 menu "I/O subsystem"
 584
 585 config QDIO
 586         def_tristate y
 587         prompt "QDIO support"
 588         ---help---
 589           This driver provides the Queued Direct I/O base support for
 590           IBM System z.
 591
 592           To compile this driver as a module, choose M here: the
 593           module will be called qdio.
 594
 595           If unsure, say Y.
 596
 597 menuconfig PCI
 598         bool "PCI support"
 599         select PCI_MSI
 600         select IOMMU_SUPPORT
 601         help
 602           Enable PCI support.
 603
 604 if PCI
 605
 606 config PCI_NR_FUNCTIONS
 607         int "Maximum number of PCI functions (1-4096)"
 608         range 1 4096
 609         default "64"
 610         help
 611           This allows you to specify the maximum number of PCI functions which
 612           this kernel will support.
 613
 614 source "drivers/pci/Kconfig"
 615
 616 endif   # PCI
 617
 618 config PCI_DOMAINS
 619         def_bool PCI
 620
 621 config HAS_IOMEM
 622         def_bool PCI
 623
 624 config IOMMU_HELPER
 625         def_bool PCI
 626
 627 config NEED_SG_DMA_LENGTH
 628         def_bool PCI
 629
 630 config NEED_DMA_MAP_STATE
 631         def_bool PCI
 632
 633 config CHSC_SCH
 634         def_tristate m
 635         prompt "Support for CHSC subchannels"
 636         help
 637           This driver allows usage of CHSC subchannels. A CHSC subchannel
 638           is usually present on LPAR only.
 639           The driver creates a device /dev/chsc, which may be used to
 640           obtain I/O configuration information about the machine and
 641           to issue asynchronous chsc commands (DANGEROUS).
 642           You will usually only want to use this interface on a special
 643           LPAR designated for system management.
 644
 645           To compile this driver as a module, choose M here: the
 646           module will be called chsc_sch.
 647
 648           If unsure, say N.
 649
 650 config SCM_BUS
 651         def_bool y
 652         prompt "SCM bus driver"
 653         help
 654           Bus driver for Storage Class Memory.
 655
 656 config EADM_SCH
 657         def_tristate m
 658         prompt "Support for EADM subchannels"
 659         depends on SCM_BUS
 660         help
 661           This driver allows usage of EADM subchannels. EADM subchannels act
 662           as a communication vehicle for SCM increments.
 663
 664           To compile this driver as a module, choose M here: the
 665           module will be called eadm_sch.
 666
 667 endmenu
 668
 669 menu "Dump support"
 670
 671 config CRASH_DUMP
 672         bool "kernel crash dumps"
 673         depends on SMP
 674         select KEXEC
 675         help
 676           Generate crash dump after being started by kexec.
 677           Crash dump kernels are loaded in the main kernel with kexec-tools
 678           into a specially reserved region and then later executed after
 679           a crash by kdump/kexec.
 680           Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this.
 681           This option also enables s390 zfcpdump.
 682           See also <file:Documentation/s390/zfcpdump.txt>
 683
 684 endmenu
 685
 686 menu "Executable file formats / Emulations"
 687
 688 source "fs/Kconfig.binfmt"
 689
 690 config SECCOMP
 691         def_bool y
 692         prompt "Enable seccomp to safely compute untrusted bytecode"
 693         depends on PROC_FS
 694         help
 695           This kernel feature is useful for number crunching applications
 696           that may need to compute untrusted bytecode during their
 697           execution. By using pipes or other transports made available to
 698           the process as file descriptors supporting the read/write
 699           syscalls, it's possible to isolate those applications in
 700           their own address space using seccomp. Once seccomp is
 701           enabled via /proc/<pid>/seccomp, it cannot be disabled
 702           and the task is only allowed to execute a few safe syscalls
 703           defined by each seccomp mode.
 704
 705           If unsure, say Y.
 706
 707 endmenu
 708
 709 menu "Power Management"
 710
 711 config ARCH_HIBERNATION_POSSIBLE
 712         def_bool y
 713
 714 source "kernel/power/Kconfig"
 715
 716 endmenu
 717
 718 source "net/Kconfig"
 719
 720 config PCMCIA
 721         def_bool n
 722
 723 config CCW
 724         def_bool y
 725
 726 source "drivers/Kconfig"
 727
 728 source "fs/Kconfig"
 729
 730 source "arch/s390/Kconfig.debug"
 731
 732 source "security/Kconfig"
 733
 734 source "crypto/Kconfig"
 735
 736 source "lib/Kconfig"
 737
 738 menu "Virtualization"
 739
 740 config PFAULT
 741         def_bool y
 742         prompt "Pseudo page fault support"
 743         help
 744           Select this option, if you want to use PFAULT pseudo page fault
 745           handling under VM. If running native or in LPAR, this option
 746           has no effect. If your VM does not support PFAULT, PAGEEX
 747           pseudo page fault handling will be used.
 748           Note that VM 4.2 supports PFAULT but has a bug in its
 749           implementation that causes some problems.
 750           Everybody who wants to run Linux under VM != VM4.2 should select
 751           this option.
 752
 753 config SHARED_KERNEL
 754         bool "VM shared kernel support"
 755         depends on !JUMP_LABEL
 756         help
 757           Select this option, if you want to share the text segment of the
 758           Linux kernel between different VM guests. This reduces memory
 759           usage with lots of guests but greatly increases kernel size.
 760           Also if a kernel was IPL'ed from a shared segment the kexec system
 761           call will not work.
 762           You should only select this option if you know what you are
 763           doing and want to exploit this feature.
 764
 765 config CMM
 766         def_tristate n
 767         prompt "Cooperative memory management"
 768         help
 769           Select this option, if you want to enable the kernel interface
 770           to reduce the memory size of the system. This is accomplished
 771           by allocating pages of memory and put them "on hold". This only
 772           makes sense for a system running under VM where the unused pages
 773           will be reused by VM for other guest systems. The interface
 774           allows an external monitor to balance memory of many systems.
 775           Everybody who wants to run Linux under VM should select this
 776           option.
 777
 778 config CMM_IUCV
 779         def_bool y
 780         prompt "IUCV special message interface to cooperative memory management"
 781         depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
 782         help
 783           Select this option to enable the special message interface to
 784           the cooperative memory management.
 785
 786 config APPLDATA_BASE
 787         def_bool n
 788         prompt "Linux - VM Monitor Stream, base infrastructure"
 789         depends on PROC_FS
 790         help
 791           This provides a kernel interface for creating and updating z/VM APPLDATA
 792           monitor records. The monitor records are updated at certain time
 793           intervals, once the timer is started.
 794           Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
 795           i.e. enables or disables monitoring on the Linux side.
 796           A custom interval value (in seconds) can be written to
 797           /proc/appldata/interval.
 798
 799           Defaults are 60 seconds interval and timer off.
 800           The /proc entries can also be read from, showing the current settings.
 801
 802 config APPLDATA_MEM
 803         def_tristate m
 804         prompt "Monitor memory management statistics"
 805         depends on APPLDATA_BASE && VM_EVENT_COUNTERS
 806         help
 807           This provides memory management related data to the Linux - VM Monitor
 808           Stream, like paging/swapping rate, memory utilisation, etc.
 809           Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
 810           APPLDATA monitor record, i.e. enables or disables monitoring this record
 811           on the z/VM side.
 812
 813           Default is disabled.
 814           The /proc entry can also be read from, showing the current settings.
 815
 816           This can also be compiled as a module, which will be called
 817           appldata_mem.o.
 818
 819 config APPLDATA_OS
 820         def_tristate m
 821         prompt "Monitor OS statistics"
 822         depends on APPLDATA_BASE
 823         help
 824           This provides OS related data to the Linux - VM Monitor Stream, like
 825           CPU utilisation, etc.
 826           Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
 827           APPLDATA monitor record, i.e. enables or disables monitoring this record
 828           on the z/VM side.
 829
 830           Default is disabled.
 831           This can also be compiled as a module, which will be called
 832           appldata_os.o.
 833
 834 config APPLDATA_NET_SUM
 835         def_tristate m
 836         prompt "Monitor overall network statistics"
 837         depends on APPLDATA_BASE && NET
 838         help
 839           This provides network related data to the Linux - VM Monitor Stream,
 840           currently there is only a total sum of network I/O statistics, no
 841           per-interface data.
 842           Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
 843           APPLDATA monitor record, i.e. enables or disables monitoring this record
 844           on the z/VM side.
 845
 846           Default is disabled.
 847           This can also be compiled as a module, which will be called
 848           appldata_net_sum.o.
 849
 850 config S390_HYPFS_FS
 851         def_bool y
 852         prompt "s390 hypervisor file system support"
 853         select SYS_HYPERVISOR
 854         help
 855           This is a virtual file system intended to provide accounting
 856           information in an s390 hypervisor environment.
 857
 858 source "arch/s390/kvm/Kconfig"
 859
 860 config S390_GUEST
 861         def_bool y
 862         prompt "s390 support for virtio devices"
 863         select TTY
 864         select VIRTUALIZATION
 865         select VIRTIO
 866         select VIRTIO_CONSOLE
 867         help
 868           Enabling this option adds support for virtio based paravirtual device
 869           drivers on s390.
 870
 871           Select this option if you want to run the kernel as a guest under
 872           the KVM hypervisor.
 873
 874 config S390_GUEST_OLD_TRANSPORT
 875         def_bool y
 876         prompt "Guest support for old s390 virtio transport (DEPRECATED)"
 877         depends on S390_GUEST
 878         help
 879           Enable this option to add support for the old s390-virtio
 880           transport (i.e. virtio devices NOT based on virtio-ccw). This
 881           type of virtio devices is only available on the experimental
 882           kuli userspace or with old (< 2.6) qemu. If you are running
 883           with a modern version of qemu (which supports virtio-ccw since
 884           1.4 and uses it by default since version 2.4), you probably won't
 885           need this.
 886
 887 endmenu