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 CPU_NO_EFFICIENT_FFS if !HAVE_MARCH_Z9_109_FEATURES
 127         select HAVE_ARCH_SECCOMP_FILTER
 128         select HAVE_ARCH_SOFT_DIRTY
 129         select HAVE_ARCH_TRACEHOOK
 130         select HAVE_ARCH_TRANSPARENT_HUGEPAGE
 131         select HAVE_EBPF_JIT if PACK_STACK && HAVE_MARCH_Z196_FEATURES
 132         select HAVE_CMPXCHG_DOUBLE
 133         select HAVE_CMPXCHG_LOCAL
 134         select HAVE_DEBUG_KMEMLEAK
 135         select HAVE_DMA_API_DEBUG
 136         select HAVE_DYNAMIC_FTRACE
 137         select HAVE_DYNAMIC_FTRACE_WITH_REGS
 138         select HAVE_EXIT_THREAD
 139         select HAVE_FTRACE_MCOUNT_RECORD
 140         select HAVE_FUNCTION_GRAPH_TRACER
 141         select HAVE_FUNCTION_TRACER
 142         select HAVE_FUTEX_CMPXCHG if FUTEX
 143         select HAVE_KERNEL_BZIP2
 144         select HAVE_KERNEL_GZIP
 145         select HAVE_KERNEL_LZ4
 146         select HAVE_KERNEL_LZMA
 147         select HAVE_KERNEL_LZO
 148         select HAVE_KERNEL_XZ
 149         select HAVE_KPROBES
 150         select HAVE_KRETPROBES
 151         select HAVE_KVM
 152         select HAVE_LIVEPATCH
 153         select HAVE_MEMBLOCK
 154         select HAVE_MEMBLOCK_NODE_MAP
 155         select HAVE_MEMBLOCK_PHYS_MAP
 156         select HAVE_MOD_ARCH_SPECIFIC
 157         select HAVE_OPROFILE
 158         select HAVE_PERF_EVENTS
 159         select HAVE_REGS_AND_STACK_ACCESS_API
 160         select HAVE_SYSCALL_TRACEPOINTS
 161         select HAVE_VIRT_CPU_ACCOUNTING
 162         select MODULES_USE_ELF_RELA
 163         select NO_BOOTMEM
 164         select OLD_SIGACTION
 165         select OLD_SIGSUSPEND3
 166         select SYSCTL_EXCEPTION_TRACE
 167         select TTY
 168         select VIRT_CPU_ACCOUNTING
 169         select VIRT_TO_BUS
 170         select HAVE_NMI
 171
 172
 173 config SCHED_OMIT_FRAME_POINTER
 174         def_bool y
 175
 176 config PGTABLE_LEVELS
 177         int
 178         default 4
 179
 180 source "init/Kconfig"
 181
 182 source "kernel/Kconfig.freezer"
 183
 184 source "kernel/livepatch/Kconfig"
 185
 186 menu "Processor type and features"
 187
 188 config HAVE_MARCH_Z900_FEATURES
 189         def_bool n
 190
 191 config HAVE_MARCH_Z990_FEATURES
 192         def_bool n
 193         select HAVE_MARCH_Z900_FEATURES
 194
 195 config HAVE_MARCH_Z9_109_FEATURES
 196         def_bool n
 197         select HAVE_MARCH_Z990_FEATURES
 198
 199 config HAVE_MARCH_Z10_FEATURES
 200         def_bool n
 201         select HAVE_MARCH_Z9_109_FEATURES
 202
 203 config HAVE_MARCH_Z196_FEATURES
 204         def_bool n
 205         select HAVE_MARCH_Z10_FEATURES
 206
 207 config HAVE_MARCH_ZEC12_FEATURES
 208         def_bool n
 209         select HAVE_MARCH_Z196_FEATURES
 210
 211 config HAVE_MARCH_Z13_FEATURES
 212         def_bool n
 213         select HAVE_MARCH_ZEC12_FEATURES
 214
 215 choice
 216         prompt "Processor type"
 217         default MARCH_Z196
 218
 219 config MARCH_Z900
 220         bool "IBM zSeries model z800 and z900"
 221         select HAVE_MARCH_Z900_FEATURES
 222         help
 223           Select this to enable optimizations for model z800/z900 (2064 and
 224           2066 series). This will enable some optimizations that are not
 225           available on older ESA/390 (31 Bit) only CPUs.
 226
 227 config MARCH_Z990
 228         bool "IBM zSeries model z890 and z990"
 229         select HAVE_MARCH_Z990_FEATURES
 230         help
 231           Select this to enable optimizations for model z890/z990 (2084 and
 232           2086 series). The kernel will be slightly faster but will not work
 233           on older machines.
 234
 235 config MARCH_Z9_109
 236         bool "IBM System z9"
 237         select HAVE_MARCH_Z9_109_FEATURES
 238         help
 239           Select this to enable optimizations for IBM System z9 (2094 and
 240           2096 series). The kernel will be slightly faster but will not work
 241           on older machines.
 242
 243 config MARCH_Z10
 244         bool "IBM System z10"
 245         select HAVE_MARCH_Z10_FEATURES
 246         help
 247           Select this to enable optimizations for IBM System z10 (2097 and
 248           2098 series). The kernel will be slightly faster but will not work
 249           on older machines.
 250
 251 config MARCH_Z196
 252         bool "IBM zEnterprise 114 and 196"
 253         select HAVE_MARCH_Z196_FEATURES
 254         help
 255           Select this to enable optimizations for IBM zEnterprise 114 and 196
 256           (2818 and 2817 series). The kernel will be slightly faster but will
 257           not work on older machines.
 258
 259 config MARCH_ZEC12
 260         bool "IBM zBC12 and zEC12"
 261         select HAVE_MARCH_ZEC12_FEATURES
 262         help
 263           Select this to enable optimizations for IBM zBC12 and zEC12 (2828 and
 264           2827 series). The kernel will be slightly faster but will not work on
 265           older machines.
 266
 267 config MARCH_Z13
 268         bool "IBM z13s and z13"
 269         select HAVE_MARCH_Z13_FEATURES
 270         help
 271           Select this to enable optimizations for IBM z13s and z13 (2965 and
 272           2964 series). The kernel will be slightly faster but will not work on
 273           older machines.
 274
 275 endchoice
 276
 277 config MARCH_Z900_TUNE
 278         def_bool TUNE_Z900 || MARCH_Z900 && TUNE_DEFAULT
 279
 280 config MARCH_Z990_TUNE
 281         def_bool TUNE_Z990 || MARCH_Z990 && TUNE_DEFAULT
 282
 283 config MARCH_Z9_109_TUNE
 284         def_bool TUNE_Z9_109 || MARCH_Z9_109 && TUNE_DEFAULT
 285
 286 config MARCH_Z10_TUNE
 287         def_bool TUNE_Z10 || MARCH_Z10 && TUNE_DEFAULT
 288
 289 config MARCH_Z196_TUNE
 290         def_bool TUNE_Z196 || MARCH_Z196 && TUNE_DEFAULT
 291
 292 config MARCH_ZEC12_TUNE
 293         def_bool TUNE_ZEC12 || MARCH_ZEC12 && TUNE_DEFAULT
 294
 295 config MARCH_Z13_TUNE
 296         def_bool TUNE_Z13 || MARCH_Z13 && TUNE_DEFAULT
 297
 298 choice
 299         prompt "Tune code generation"
 300         default TUNE_DEFAULT
 301         help
 302           Cause the compiler to tune (-mtune) the generated code for a machine.
 303           This will make the code run faster on the selected machine but
 304           somewhat slower on other machines.
 305           This option only changes how the compiler emits instructions, not the
 306           selection of instructions itself, so the resulting kernel will run on
 307           all other machines.
 308
 309 config TUNE_DEFAULT
 310         bool "Default"
 311         help
 312           Tune the generated code for the target processor for which the kernel
 313           will be compiled.
 314
 315 config TUNE_Z900
 316         bool "IBM zSeries model z800 and z900"
 317
 318 config TUNE_Z990
 319         bool "IBM zSeries model z890 and z990"
 320
 321 config TUNE_Z9_109
 322         bool "IBM System z9"
 323
 324 config TUNE_Z10
 325         bool "IBM System z10"
 326
 327 config TUNE_Z196
 328         bool "IBM zEnterprise 114 and 196"
 329
 330 config TUNE_ZEC12
 331         bool "IBM zBC12 and zEC12"
 332
 333 config TUNE_Z13
 334         bool "IBM z13"
 335
 336 endchoice
 337
 338 config 64BIT
 339         def_bool y
 340
 341 config COMPAT
 342         def_bool y
 343         prompt "Kernel support for 31 bit emulation"
 344         select COMPAT_BINFMT_ELF if BINFMT_ELF
 345         select ARCH_WANT_OLD_COMPAT_IPC
 346         select COMPAT_OLD_SIGACTION
 347         depends on MULTIUSER
 348         help
 349           Select this option if you want to enable your system kernel to
 350           handle system-calls from ELF binaries for 31 bit ESA.  This option
 351           (and some other stuff like libraries and such) is needed for
 352           executing 31 bit applications.  It is safe to say "Y".
 353
 354 config SYSVIPC_COMPAT
 355         def_bool y if COMPAT && SYSVIPC
 356
 357 config KEYS_COMPAT
 358         def_bool y if COMPAT && KEYS
 359
 360 config SMP
 361         def_bool y
 362         prompt "Symmetric multi-processing support"
 363         ---help---
 364           This enables support for systems with more than one CPU. If you have
 365           a system with only one CPU, like most personal computers, say N. If
 366           you have a system with more than one CPU, say Y.
 367
 368           If you say N here, the kernel will run on uni- and multiprocessor
 369           machines, but will use only one CPU of a multiprocessor machine. If
 370           you say Y here, the kernel will run on many, but not all,
 371           uniprocessor machines. On a uniprocessor machine, the kernel
 372           will run faster if you say N here.
 373
 374           See also the SMP-HOWTO available at
 375           <http://www.tldp.org/docs.html#howto>.
 376
 377           Even if you don't know what to do here, say Y.
 378
 379 config NR_CPUS
 380         int "Maximum number of CPUs (2-512)"
 381         range 2 512
 382         depends on SMP
 383         default "64"
 384         help
 385           This allows you to specify the maximum number of CPUs which this
 386           kernel will support. The maximum supported value is 512 and the
 387           minimum value which makes sense is 2.
 388
 389           This is purely to save memory - each supported CPU adds
 390           approximately sixteen kilobytes to the kernel image.
 391
 392 config HOTPLUG_CPU
 393         def_bool y
 394         prompt "Support for hot-pluggable CPUs"
 395         depends on SMP
 396         help
 397           Say Y here to be able to turn CPUs off and on. CPUs
 398           can be controlled through /sys/devices/system/cpu/cpu#.
 399           Say N if you want to disable CPU hotplug.
 400
 401 # Some NUMA nodes have memory ranges that span
 402 # other nodes.  Even though a pfn is valid and
 403 # between a node's start and end pfns, it may not
 404 # reside on that node.  See memmap_init_zone()
 405 # for details. <- They meant memory holes!
 406 config NODES_SPAN_OTHER_NODES
 407         def_bool NUMA
 408
 409 config NUMA
 410         bool "NUMA support"
 411         depends on SMP && SCHED_TOPOLOGY
 412         default n
 413         help
 414           Enable NUMA support
 415
 416           This option adds NUMA support to the kernel.
 417
 418           An operation mode can be selected by appending
 419           numa=<method> to the kernel command line.
 420
 421           The default behaviour is identical to appending numa=plain to
 422           the command line. This will create just one node with all
 423           available memory and all CPUs in it.
 424
 425 config NODES_SHIFT
 426         int "Maximum NUMA nodes (as a power of 2)"
 427         range 1 10
 428         depends on NUMA
 429         default "4"
 430         help
 431           Specify the maximum number of NUMA nodes available on the target
 432           system. Increases memory reserved to accommodate various tables.
 433
 434 menu "Select NUMA modes"
 435         depends on NUMA
 436
 437 config NUMA_EMU
 438         bool "NUMA emulation"
 439         default y
 440         help
 441           Numa emulation mode will split the available system memory into
 442           equal chunks which then are distributed over the configured number
 443           of nodes in a round-robin manner.
 444
 445           The number of fake nodes is limited by the number of available memory
 446           chunks (i.e. memory size / fake size) and the number of supported
 447           nodes in the kernel.
 448
 449           The CPUs are assigned to the nodes in a way that partially respects
 450           the original machine topology (if supported by the machine).
 451           Fair distribution of the CPUs is not guaranteed.
 452
 453 config EMU_SIZE
 454         hex "NUMA emulation memory chunk size"
 455         default 0x10000000
 456         range 0x400000 0x100000000
 457         depends on NUMA_EMU
 458         help
 459           Select the default size by which the memory is chopped and then
 460           assigned to emulated NUMA nodes.
 461
 462           This can be overridden by specifying
 463
 464           emu_size=<n>
 465
 466           on the kernel command line where also suffixes K, M, G, and T are
 467           supported.
 468
 469 endmenu
 470
 471 config SCHED_SMT
 472         def_bool n
 473
 474 config SCHED_MC
 475         def_bool n
 476
 477 config SCHED_BOOK
 478         def_bool n
 479
 480 config SCHED_TOPOLOGY
 481         def_bool y
 482         prompt "Topology scheduler support"
 483         depends on SMP
 484         select SCHED_SMT
 485         select SCHED_MC
 486         select SCHED_BOOK
 487         help
 488           Topology scheduler support improves the CPU scheduler's decision
 489           making when dealing with machines that have multi-threading,
 490           multiple cores or multiple books.
 491
 492 source kernel/Kconfig.preempt
 493
 494 source kernel/Kconfig.hz
 495
 496 endmenu
 497
 498 menu "Memory setup"
 499
 500 config ARCH_SPARSEMEM_ENABLE
 501         def_bool y
 502         select SPARSEMEM_VMEMMAP_ENABLE
 503         select SPARSEMEM_VMEMMAP
 504
 505 config ARCH_SPARSEMEM_DEFAULT
 506         def_bool y
 507
 508 config ARCH_SELECT_MEMORY_MODEL
 509         def_bool y
 510
 511 config ARCH_ENABLE_MEMORY_HOTPLUG
 512         def_bool y if SPARSEMEM
 513
 514 config ARCH_ENABLE_MEMORY_HOTREMOVE
 515         def_bool y
 516
 517 config ARCH_ENABLE_SPLIT_PMD_PTLOCK
 518         def_bool y
 519
 520 config FORCE_MAX_ZONEORDER
 521         int
 522         default "9"
 523
 524 source "mm/Kconfig"
 525
 526 config PACK_STACK
 527         def_bool y
 528         prompt "Pack kernel stack"
 529         help
 530           This option enables the compiler option -mkernel-backchain if it
 531           is available. If the option is available the compiler supports
 532           the new stack layout which dramatically reduces the minimum stack
 533           frame size. With an old compiler a non-leaf function needs a
 534           minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
 535           -mkernel-backchain the minimum size drops to 16 byte on 31 bit
 536           and 24 byte on 64 bit.
 537
 538           Say Y if you are unsure.
 539
 540 config CHECK_STACK
 541         def_bool y
 542         prompt "Detect kernel stack overflow"
 543         help
 544           This option enables the compiler option -mstack-guard and
 545           -mstack-size if they are available. If the compiler supports them
 546           it will emit additional code to each function prolog to trigger
 547           an illegal operation if the kernel stack is about to overflow.
 548
 549           Say N if you are unsure.
 550
 551 config STACK_GUARD
 552         int "Size of the guard area (128-1024)"
 553         range 128 1024
 554         depends on CHECK_STACK
 555         default "256"
 556         help
 557           This allows you to specify the size of the guard area at the lower
 558           end of the kernel stack. If the kernel stack points into the guard
 559           area on function entry an illegal operation is triggered. The size
 560           needs to be a power of 2. Please keep in mind that the size of an
 561           interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
 562           The minimum size for the stack guard should be 256 for 31 bit and
 563           512 for 64 bit.
 564
 565 config WARN_DYNAMIC_STACK
 566         def_bool n
 567         prompt "Emit compiler warnings for function with dynamic stack usage"
 568         help
 569           This option enables the compiler option -mwarn-dynamicstack. If the
 570           compiler supports this options generates warnings for functions
 571           that dynamically allocate stack space using alloca.
 572
 573           Say N if you are unsure.
 574
 575 endmenu
 576
 577 menu "I/O subsystem"
 578
 579 config QDIO
 580         def_tristate y
 581         prompt "QDIO support"
 582         ---help---
 583           This driver provides the Queued Direct I/O base support for
 584           IBM System z.
 585
 586           To compile this driver as a module, choose M here: the
 587           module will be called qdio.
 588
 589           If unsure, say Y.
 590
 591 menuconfig PCI
 592         bool "PCI support"
 593         select PCI_MSI
 594         select IOMMU_SUPPORT
 595         help
 596           Enable PCI support.
 597
 598 if PCI
 599
 600 config PCI_NR_FUNCTIONS
 601         int "Maximum number of PCI functions (1-4096)"
 602         range 1 4096
 603         default "64"
 604         help
 605           This allows you to specify the maximum number of PCI functions which
 606           this kernel will support.
 607
 608 config PCI_NR_MSI
 609         int "Maximum number of MSI interrupts (64-32768)"
 610         range 64 32768
 611         default "256"
 612         help
 613           This defines the number of virtual interrupts the kernel will
 614           provide for MSI interrupts. If you configure your system to have
 615           too few drivers will fail to allocate MSI interrupts for all
 616           PCI devices.
 617
 618 source "drivers/pci/Kconfig"
 619
 620 endif   # PCI
 621
 622 config PCI_DOMAINS
 623         def_bool PCI
 624
 625 config HAS_IOMEM
 626         def_bool PCI
 627
 628 config IOMMU_HELPER
 629         def_bool PCI
 630
 631 config NEED_SG_DMA_LENGTH
 632         def_bool PCI
 633
 634 config NEED_DMA_MAP_STATE
 635         def_bool PCI
 636
 637 config CHSC_SCH
 638         def_tristate m
 639         prompt "Support for CHSC subchannels"
 640         help
 641           This driver allows usage of CHSC subchannels. A CHSC subchannel
 642           is usually present on LPAR only.
 643           The driver creates a device /dev/chsc, which may be used to
 644           obtain I/O configuration information about the machine and
 645           to issue asynchronous chsc commands (DANGEROUS).
 646           You will usually only want to use this interface on a special
 647           LPAR designated for system management.
 648
 649           To compile this driver as a module, choose M here: the
 650           module will be called chsc_sch.
 651
 652           If unsure, say N.
 653
 654 config SCM_BUS
 655         def_bool y
 656         prompt "SCM bus driver"
 657         help
 658           Bus driver for Storage Class Memory.
 659
 660 config EADM_SCH
 661         def_tristate m
 662         prompt "Support for EADM subchannels"
 663         depends on SCM_BUS
 664         help
 665           This driver allows usage of EADM subchannels. EADM subchannels act
 666           as a communication vehicle for SCM increments.
 667
 668           To compile this driver as a module, choose M here: the
 669           module will be called eadm_sch.
 670
 671 endmenu
 672
 673 menu "Dump support"
 674
 675 config CRASH_DUMP
 676         bool "kernel crash dumps"
 677         depends on SMP
 678         select KEXEC
 679         help
 680           Generate crash dump after being started by kexec.
 681           Crash dump kernels are loaded in the main kernel with kexec-tools
 682           into a specially reserved region and then later executed after
 683           a crash by kdump/kexec.
 684           Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this.
 685           This option also enables s390 zfcpdump.
 686           See also <file:Documentation/s390/zfcpdump.txt>
 687
 688 endmenu
 689
 690 menu "Executable file formats / Emulations"
 691
 692 source "fs/Kconfig.binfmt"
 693
 694 config SECCOMP
 695         def_bool y
 696         prompt "Enable seccomp to safely compute untrusted bytecode"
 697         depends on PROC_FS
 698         help
 699           This kernel feature is useful for number crunching applications
 700           that may need to compute untrusted bytecode during their
 701           execution. By using pipes or other transports made available to
 702           the process as file descriptors supporting the read/write
 703           syscalls, it's possible to isolate those applications in
 704           their own address space using seccomp. Once seccomp is
 705           enabled via /proc/<pid>/seccomp, it cannot be disabled
 706           and the task is only allowed to execute a few safe syscalls
 707           defined by each seccomp mode.
 708
 709           If unsure, say Y.
 710
 711 endmenu
 712
 713 menu "Power Management"
 714
 715 config ARCH_HIBERNATION_POSSIBLE
 716         def_bool y
 717
 718 source "kernel/power/Kconfig"
 719
 720 endmenu
 721
 722 source "net/Kconfig"
 723
 724 config PCMCIA
 725         def_bool n
 726
 727 config CCW
 728         def_bool y
 729
 730 source "drivers/Kconfig"
 731
 732 source "fs/Kconfig"
 733
 734 source "arch/s390/Kconfig.debug"
 735
 736 source "security/Kconfig"
 737
 738 source "crypto/Kconfig"
 739
 740 source "lib/Kconfig"
 741
 742 menu "Virtualization"
 743
 744 config PFAULT
 745         def_bool y
 746         prompt "Pseudo page fault support"
 747         help
 748           Select this option, if you want to use PFAULT pseudo page fault
 749           handling under VM. If running native or in LPAR, this option
 750           has no effect. If your VM does not support PFAULT, PAGEEX
 751           pseudo page fault handling will be used.
 752           Note that VM 4.2 supports PFAULT but has a bug in its
 753           implementation that causes some problems.
 754           Everybody who wants to run Linux under VM != VM4.2 should select
 755           this option.
 756
 757 config SHARED_KERNEL
 758         bool "VM shared kernel support"
 759         depends on !JUMP_LABEL
 760         help
 761           Select this option, if you want to share the text segment of the
 762           Linux kernel between different VM guests. This reduces memory
 763           usage with lots of guests but greatly increases kernel size.
 764           Also if a kernel was IPL'ed from a shared segment the kexec system
 765           call will not work.
 766           You should only select this option if you know what you are
 767           doing and want to exploit this feature.
 768
 769 config CMM
 770         def_tristate n
 771         prompt "Cooperative memory management"
 772         help
 773           Select this option, if you want to enable the kernel interface
 774           to reduce the memory size of the system. This is accomplished
 775           by allocating pages of memory and put them "on hold". This only
 776           makes sense for a system running under VM where the unused pages
 777           will be reused by VM for other guest systems. The interface
 778           allows an external monitor to balance memory of many systems.
 779           Everybody who wants to run Linux under VM should select this
 780           option.
 781
 782 config CMM_IUCV
 783         def_bool y
 784         prompt "IUCV special message interface to cooperative memory management"
 785         depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
 786         help
 787           Select this option to enable the special message interface to
 788           the cooperative memory management.
 789
 790 config APPLDATA_BASE
 791         def_bool n
 792         prompt "Linux - VM Monitor Stream, base infrastructure"
 793         depends on PROC_FS
 794         help
 795           This provides a kernel interface for creating and updating z/VM APPLDATA
 796           monitor records. The monitor records are updated at certain time
 797           intervals, once the timer is started.
 798           Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
 799           i.e. enables or disables monitoring on the Linux side.
 800           A custom interval value (in seconds) can be written to
 801           /proc/appldata/interval.
 802
 803           Defaults are 60 seconds interval and timer off.
 804           The /proc entries can also be read from, showing the current settings.
 805
 806 config APPLDATA_MEM
 807         def_tristate m
 808         prompt "Monitor memory management statistics"
 809         depends on APPLDATA_BASE && VM_EVENT_COUNTERS
 810         help
 811           This provides memory management related data to the Linux - VM Monitor
 812           Stream, like paging/swapping rate, memory utilisation, etc.
 813           Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
 814           APPLDATA monitor record, i.e. enables or disables monitoring this record
 815           on the z/VM side.
 816
 817           Default is disabled.
 818           The /proc entry can also be read from, showing the current settings.
 819
 820           This can also be compiled as a module, which will be called
 821           appldata_mem.o.
 822
 823 config APPLDATA_OS
 824         def_tristate m
 825         prompt "Monitor OS statistics"
 826         depends on APPLDATA_BASE
 827         help
 828           This provides OS related data to the Linux - VM Monitor Stream, like
 829           CPU utilisation, etc.
 830           Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
 831           APPLDATA monitor record, i.e. enables or disables monitoring this record
 832           on the z/VM side.
 833
 834           Default is disabled.
 835           This can also be compiled as a module, which will be called
 836           appldata_os.o.
 837
 838 config APPLDATA_NET_SUM
 839         def_tristate m
 840         prompt "Monitor overall network statistics"
 841         depends on APPLDATA_BASE && NET
 842         help
 843           This provides network related data to the Linux - VM Monitor Stream,
 844           currently there is only a total sum of network I/O statistics, no
 845           per-interface data.
 846           Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
 847           APPLDATA monitor record, i.e. enables or disables monitoring this record
 848           on the z/VM side.
 849
 850           Default is disabled.
 851           This can also be compiled as a module, which will be called
 852           appldata_net_sum.o.
 853
 854 config S390_HYPFS_FS
 855         def_bool y
 856         prompt "s390 hypervisor file system support"
 857         select SYS_HYPERVISOR
 858         help
 859           This is a virtual file system intended to provide accounting
 860           information in an s390 hypervisor environment.
 861
 862 source "arch/s390/kvm/Kconfig"
 863
 864 config S390_GUEST
 865         def_bool y
 866         prompt "s390 support for virtio devices"
 867         select TTY
 868         select VIRTUALIZATION
 869         select VIRTIO
 870         select VIRTIO_CONSOLE
 871         help
 872           Enabling this option adds support for virtio based paravirtual device
 873           drivers on s390.
 874
 875           Select this option if you want to run the kernel as a guest under
 876           the KVM hypervisor.
 877
 878 endmenu