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