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_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_JUMP_LABEL
 126         select HAVE_ARCH_SECCOMP_FILTER
 127         select HAVE_ARCH_SOFT_DIRTY
 128         select HAVE_ARCH_TRACEHOOK
 129         select HAVE_ARCH_TRANSPARENT_HUGEPAGE
 130         select HAVE_EBPF_JIT if PACK_STACK && HAVE_MARCH_Z196_FEATURES
 131         select HAVE_CMPXCHG_DOUBLE
 132         select HAVE_CMPXCHG_LOCAL
 133         select HAVE_DEBUG_KMEMLEAK
 134         select HAVE_DMA_API_DEBUG
 135         select HAVE_DYNAMIC_FTRACE
 136         select HAVE_DYNAMIC_FTRACE_WITH_REGS
 137         select HAVE_FTRACE_MCOUNT_RECORD
 138         select HAVE_FUNCTION_GRAPH_TRACER
 139         select HAVE_FUNCTION_TRACER
 140         select HAVE_FUTEX_CMPXCHG if FUTEX
 141         select HAVE_KERNEL_BZIP2
 142         select HAVE_KERNEL_GZIP
 143         select HAVE_KERNEL_LZ4
 144         select HAVE_KERNEL_LZMA
 145         select HAVE_KERNEL_LZO
 146         select HAVE_KERNEL_XZ
 147         select HAVE_KPROBES
 148         select HAVE_KRETPROBES
 149         select HAVE_KVM
 150         select HAVE_LIVEPATCH
 151         select HAVE_MEMBLOCK
 152         select HAVE_MEMBLOCK_NODE_MAP
 153         select HAVE_MEMBLOCK_PHYS_MAP
 154         select HAVE_MOD_ARCH_SPECIFIC
 155         select HAVE_OPROFILE
 156         select HAVE_PERF_EVENTS
 157         select HAVE_REGS_AND_STACK_ACCESS_API
 158         select HAVE_SYSCALL_TRACEPOINTS
 159         select HAVE_VIRT_CPU_ACCOUNTING
 160         select MODULES_USE_ELF_RELA
 161         select NO_BOOTMEM
 162         select OLD_SIGACTION
 163         select OLD_SIGSUSPEND3
 164         select SYSCTL_EXCEPTION_TRACE
 165         select TTY
 166         select VIRT_CPU_ACCOUNTING
 167         select VIRT_TO_BUS
 168
 169
 170 config SCHED_OMIT_FRAME_POINTER
 171         def_bool y
 172
 173 config PGTABLE_LEVELS
 174         int
 175         default 4
 176
 177 source "init/Kconfig"
 178
 179 source "kernel/Kconfig.freezer"
 180
 181 source "kernel/livepatch/Kconfig"
 182
 183 menu "Processor type and features"
 184
 185 config HAVE_MARCH_Z900_FEATURES
 186         def_bool n
 187
 188 config HAVE_MARCH_Z990_FEATURES
 189         def_bool n
 190         select HAVE_MARCH_Z900_FEATURES
 191
 192 config HAVE_MARCH_Z9_109_FEATURES
 193         def_bool n
 194         select HAVE_MARCH_Z990_FEATURES
 195
 196 config HAVE_MARCH_Z10_FEATURES
 197         def_bool n
 198         select HAVE_MARCH_Z9_109_FEATURES
 199
 200 config HAVE_MARCH_Z196_FEATURES
 201         def_bool n
 202         select HAVE_MARCH_Z10_FEATURES
 203
 204 config HAVE_MARCH_ZEC12_FEATURES
 205         def_bool n
 206         select HAVE_MARCH_Z196_FEATURES
 207
 208 config HAVE_MARCH_Z13_FEATURES
 209         def_bool n
 210         select HAVE_MARCH_ZEC12_FEATURES
 211
 212 choice
 213         prompt "Processor type"
 214         default MARCH_Z196
 215
 216 config MARCH_Z900
 217         bool "IBM zSeries model z800 and z900"
 218         select HAVE_MARCH_Z900_FEATURES
 219         help
 220           Select this to enable optimizations for model z800/z900 (2064 and
 221           2066 series). This will enable some optimizations that are not
 222           available on older ESA/390 (31 Bit) only CPUs.
 223
 224 config MARCH_Z990
 225         bool "IBM zSeries model z890 and z990"
 226         select HAVE_MARCH_Z990_FEATURES
 227         help
 228           Select this to enable optimizations for model z890/z990 (2084 and
 229           2086 series). The kernel will be slightly faster but will not work
 230           on older machines.
 231
 232 config MARCH_Z9_109
 233         bool "IBM System z9"
 234         select HAVE_MARCH_Z9_109_FEATURES
 235         help
 236           Select this to enable optimizations for IBM System z9 (2094 and
 237           2096 series). The kernel will be slightly faster but will not work
 238           on older machines.
 239
 240 config MARCH_Z10
 241         bool "IBM System z10"
 242         select HAVE_MARCH_Z10_FEATURES
 243         help
 244           Select this to enable optimizations for IBM System z10 (2097 and
 245           2098 series). The kernel will be slightly faster but will not work
 246           on older machines.
 247
 248 config MARCH_Z196
 249         bool "IBM zEnterprise 114 and 196"
 250         select HAVE_MARCH_Z196_FEATURES
 251         help
 252           Select this to enable optimizations for IBM zEnterprise 114 and 196
 253           (2818 and 2817 series). The kernel will be slightly faster but will
 254           not work on older machines.
 255
 256 config MARCH_ZEC12
 257         bool "IBM zBC12 and zEC12"
 258         select HAVE_MARCH_ZEC12_FEATURES
 259         help
 260           Select this to enable optimizations for IBM zBC12 and zEC12 (2828 and
 261           2827 series). The kernel will be slightly faster but will not work on
 262           older machines.
 263
 264 config MARCH_Z13
 265         bool "IBM z13s and z13"
 266         select HAVE_MARCH_Z13_FEATURES
 267         help
 268           Select this to enable optimizations for IBM z13s and z13 (2965 and
 269           2964 series). The kernel will be slightly faster but will not work on
 270           older machines.
 271
 272 endchoice
 273
 274 config MARCH_Z900_TUNE
 275         def_bool TUNE_Z900 || MARCH_Z900 && TUNE_DEFAULT
 276
 277 config MARCH_Z990_TUNE
 278         def_bool TUNE_Z990 || MARCH_Z990 && TUNE_DEFAULT
 279
 280 config MARCH_Z9_109_TUNE
 281         def_bool TUNE_Z9_109 || MARCH_Z9_109 && TUNE_DEFAULT
 282
 283 config MARCH_Z10_TUNE
 284         def_bool TUNE_Z10 || MARCH_Z10 && TUNE_DEFAULT
 285
 286 config MARCH_Z196_TUNE
 287         def_bool TUNE_Z196 || MARCH_Z196 && TUNE_DEFAULT
 288
 289 config MARCH_ZEC12_TUNE
 290         def_bool TUNE_ZEC12 || MARCH_ZEC12 && TUNE_DEFAULT
 291
 292 config MARCH_Z13_TUNE
 293         def_bool TUNE_Z13 || MARCH_Z13 && TUNE_DEFAULT
 294
 295 choice
 296         prompt "Tune code generation"
 297         default TUNE_DEFAULT
 298         help
 299           Cause the compiler to tune (-mtune) the generated code for a machine.
 300           This will make the code run faster on the selected machine but
 301           somewhat slower on other machines.
 302           This option only changes how the compiler emits instructions, not the
 303           selection of instructions itself, so the resulting kernel will run on
 304           all other machines.
 305
 306 config TUNE_DEFAULT
 307         bool "Default"
 308         help
 309           Tune the generated code for the target processor for which the kernel
 310           will be compiled.
 311
 312 config TUNE_Z900
 313         bool "IBM zSeries model z800 and z900"
 314
 315 config TUNE_Z990
 316         bool "IBM zSeries model z890 and z990"
 317
 318 config TUNE_Z9_109
 319         bool "IBM System z9"
 320
 321 config TUNE_Z10
 322         bool "IBM System z10"
 323
 324 config TUNE_Z196
 325         bool "IBM zEnterprise 114 and 196"
 326
 327 config TUNE_ZEC12
 328         bool "IBM zBC12 and zEC12"
 329
 330 config TUNE_Z13
 331         bool "IBM z13"
 332
 333 endchoice
 334
 335 config 64BIT
 336         def_bool y
 337
 338 config COMPAT
 339         def_bool y
 340         prompt "Kernel support for 31 bit emulation"
 341         select COMPAT_BINFMT_ELF if BINFMT_ELF
 342         select ARCH_WANT_OLD_COMPAT_IPC
 343         select COMPAT_OLD_SIGACTION
 344         depends on MULTIUSER
 345         help
 346           Select this option if you want to enable your system kernel to
 347           handle system-calls from ELF binaries for 31 bit ESA.  This option
 348           (and some other stuff like libraries and such) is needed for
 349           executing 31 bit applications.  It is safe to say "Y".
 350
 351 config SYSVIPC_COMPAT
 352         def_bool y if COMPAT && SYSVIPC
 353
 354 config KEYS_COMPAT
 355         def_bool y if COMPAT && KEYS
 356
 357 config SMP
 358         def_bool y
 359         prompt "Symmetric multi-processing support"
 360         ---help---
 361           This enables support for systems with more than one CPU. If you have
 362           a system with only one CPU, like most personal computers, say N. If
 363           you have a system with more than one CPU, say Y.
 364
 365           If you say N here, the kernel will run on uni- and multiprocessor
 366           machines, but will use only one CPU of a multiprocessor machine. If
 367           you say Y here, the kernel will run on many, but not all,
 368           uniprocessor machines. On a uniprocessor machine, the kernel
 369           will run faster if you say N here.
 370
 371           See also the SMP-HOWTO available at
 372           <http://www.tldp.org/docs.html#howto>.
 373
 374           Even if you don't know what to do here, say Y.
 375
 376 config NR_CPUS
 377         int "Maximum number of CPUs (2-512)"
 378         range 2 512
 379         depends on SMP
 380         default "64"
 381         help
 382           This allows you to specify the maximum number of CPUs which this
 383           kernel will support. The maximum supported value is 512 and the
 384           minimum value which makes sense is 2.
 385
 386           This is purely to save memory - each supported CPU adds
 387           approximately sixteen kilobytes to the kernel image.
 388
 389 config HOTPLUG_CPU
 390         def_bool y
 391         prompt "Support for hot-pluggable CPUs"
 392         depends on SMP
 393         help
 394           Say Y here to be able to turn CPUs off and on. CPUs
 395           can be controlled through /sys/devices/system/cpu/cpu#.
 396           Say N if you want to disable CPU hotplug.
 397
 398 # Some NUMA nodes have memory ranges that span
 399 # other nodes.  Even though a pfn is valid and
 400 # between a node's start and end pfns, it may not
 401 # reside on that node.  See memmap_init_zone()
 402 # for details. <- They meant memory holes!
 403 config NODES_SPAN_OTHER_NODES
 404         def_bool NUMA
 405
 406 config NUMA
 407         bool "NUMA support"
 408         depends on SMP && SCHED_TOPOLOGY
 409         default n
 410         help
 411           Enable NUMA support
 412
 413           This option adds NUMA support to the kernel.
 414
 415           An operation mode can be selected by appending
 416           numa=<method> to the kernel command line.
 417
 418           The default behaviour is identical to appending numa=plain to
 419           the command line. This will create just one node with all
 420           available memory and all CPUs in it.
 421
 422 config NODES_SHIFT
 423         int "Maximum NUMA nodes (as a power of 2)"
 424         range 1 10
 425         depends on NUMA
 426         default "4"
 427         help
 428           Specify the maximum number of NUMA nodes available on the target
 429           system. Increases memory reserved to accommodate various tables.
 430
 431 menu "Select NUMA modes"
 432         depends on NUMA
 433
 434 config NUMA_EMU
 435         bool "NUMA emulation"
 436         default y
 437         help
 438           Numa emulation mode will split the available system memory into
 439           equal chunks which then are distributed over the configured number
 440           of nodes in a round-robin manner.
 441
 442           The number of fake nodes is limited by the number of available memory
 443           chunks (i.e. memory size / fake size) and the number of supported
 444           nodes in the kernel.
 445
 446           The CPUs are assigned to the nodes in a way that partially respects
 447           the original machine topology (if supported by the machine).
 448           Fair distribution of the CPUs is not guaranteed.
 449
 450 config EMU_SIZE
 451         hex "NUMA emulation memory chunk size"
 452         default 0x10000000
 453         range 0x400000 0x100000000
 454         depends on NUMA_EMU
 455         help
 456           Select the default size by which the memory is chopped and then
 457           assigned to emulated NUMA nodes.
 458
 459           This can be overridden by specifying
 460
 461           emu_size=<n>
 462
 463           on the kernel command line where also suffixes K, M, G, and T are
 464           supported.
 465
 466 endmenu
 467
 468 config SCHED_SMT
 469         def_bool n
 470
 471 config SCHED_MC
 472         def_bool n
 473
 474 config SCHED_BOOK
 475         def_bool n
 476
 477 config SCHED_TOPOLOGY
 478         def_bool y
 479         prompt "Topology scheduler support"
 480         depends on SMP
 481         select SCHED_SMT
 482         select SCHED_MC
 483         select SCHED_BOOK
 484         help
 485           Topology scheduler support improves the CPU scheduler's decision
 486           making when dealing with machines that have multi-threading,
 487           multiple cores or multiple books.
 488
 489 source kernel/Kconfig.preempt
 490
 491 source kernel/Kconfig.hz
 492
 493 endmenu
 494
 495 menu "Memory setup"
 496
 497 config ARCH_SPARSEMEM_ENABLE
 498         def_bool y
 499         select SPARSEMEM_VMEMMAP_ENABLE
 500         select SPARSEMEM_VMEMMAP
 501
 502 config ARCH_SPARSEMEM_DEFAULT
 503         def_bool y
 504
 505 config ARCH_SELECT_MEMORY_MODEL
 506         def_bool y
 507
 508 config ARCH_ENABLE_MEMORY_HOTPLUG
 509         def_bool y if SPARSEMEM
 510
 511 config ARCH_ENABLE_MEMORY_HOTREMOVE
 512         def_bool y
 513
 514 config ARCH_ENABLE_SPLIT_PMD_PTLOCK
 515         def_bool y
 516
 517 config FORCE_MAX_ZONEORDER
 518         int
 519         default "9"
 520
 521 source "mm/Kconfig"
 522
 523 config PACK_STACK
 524         def_bool y
 525         prompt "Pack kernel stack"
 526         help
 527           This option enables the compiler option -mkernel-backchain if it
 528           is available. If the option is available the compiler supports
 529           the new stack layout which dramatically reduces the minimum stack
 530           frame size. With an old compiler a non-leaf function needs a
 531           minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
 532           -mkernel-backchain the minimum size drops to 16 byte on 31 bit
 533           and 24 byte on 64 bit.
 534
 535           Say Y if you are unsure.
 536
 537 config CHECK_STACK
 538         def_bool y
 539         prompt "Detect kernel stack overflow"
 540         help
 541           This option enables the compiler option -mstack-guard and
 542           -mstack-size if they are available. If the compiler supports them
 543           it will emit additional code to each function prolog to trigger
 544           an illegal operation if the kernel stack is about to overflow.
 545
 546           Say N if you are unsure.
 547
 548 config STACK_GUARD
 549         int "Size of the guard area (128-1024)"
 550         range 128 1024
 551         depends on CHECK_STACK
 552         default "256"
 553         help
 554           This allows you to specify the size of the guard area at the lower
 555           end of the kernel stack. If the kernel stack points into the guard
 556           area on function entry an illegal operation is triggered. The size
 557           needs to be a power of 2. Please keep in mind that the size of an
 558           interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
 559           The minimum size for the stack guard should be 256 for 31 bit and
 560           512 for 64 bit.
 561
 562 config WARN_DYNAMIC_STACK
 563         def_bool n
 564         prompt "Emit compiler warnings for function with dynamic stack usage"
 565         help
 566           This option enables the compiler option -mwarn-dynamicstack. If the
 567           compiler supports this options generates warnings for functions
 568           that dynamically allocate stack space using alloca.
 569
 570           Say N if you are unsure.
 571
 572 endmenu
 573
 574 menu "I/O subsystem"
 575
 576 config QDIO
 577         def_tristate y
 578         prompt "QDIO support"
 579         ---help---
 580           This driver provides the Queued Direct I/O base support for
 581           IBM System z.
 582
 583           To compile this driver as a module, choose M here: the
 584           module will be called qdio.
 585
 586           If unsure, say Y.
 587
 588 menuconfig PCI
 589         bool "PCI support"
 590         select PCI_MSI
 591         select IOMMU_SUPPORT
 592         help
 593           Enable PCI support.
 594
 595 if PCI
 596
 597 config PCI_NR_FUNCTIONS
 598         int "Maximum number of PCI functions (1-4096)"
 599         range 1 4096
 600         default "64"
 601         help
 602           This allows you to specify the maximum number of PCI functions which
 603           this kernel will support.
 604
 605 config PCI_NR_MSI
 606         int "Maximum number of MSI interrupts (64-32768)"
 607         range 64 32768
 608         default "256"
 609         help
 610           This defines the number of virtual interrupts the kernel will
 611           provide for MSI interrupts. If you configure your system to have
 612           too few drivers will fail to allocate MSI interrupts for all
 613           PCI devices.
 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 endmenu