arch/s390/Kconfig

   1 config MMU
   2         def_bool y
   3
   4 config ZONE_DMA
   5         def_bool y
   6
   7 config CPU_BIG_ENDIAN
   8         def_bool y
   9
  10 config LOCKDEP_SUPPORT
  11         def_bool y
  12
  13 config STACKTRACE_SUPPORT
  14         def_bool y
  15
  16 config RWSEM_GENERIC_SPINLOCK
  17         bool
  18
  19 config RWSEM_XCHGADD_ALGORITHM
  20         def_bool y
  21
  22 config ARCH_HAS_ILOG2_U32
  23         def_bool n
  24
  25 config ARCH_HAS_ILOG2_U64
  26         def_bool n
  27
  28 config GENERIC_HWEIGHT
  29         def_bool y
  30
  31 config GENERIC_BUG
  32         def_bool y if BUG
  33
  34 config GENERIC_BUG_RELATIVE_POINTERS
  35         def_bool y
  36
  37 config ARCH_DMA_ADDR_T_64BIT
  38         def_bool y
  39
  40 config GENERIC_LOCKBREAK
  41         def_bool y if SMP && PREEMPT
  42
  43 config PGSTE
  44         def_bool y if KVM
  45
  46 config ARCH_SUPPORTS_DEBUG_PAGEALLOC
  47         def_bool y
  48
  49 config KEXEC
  50         def_bool y
  51         select KEXEC_CORE
  52
  53 config AUDIT_ARCH
  54         def_bool y
  55
  56 config NO_IOPORT_MAP
  57         def_bool y
  58
  59 config PCI_QUIRKS
  60         def_bool n
  61
  62 config ARCH_SUPPORTS_UPROBES
  63         def_bool y
  64
  65 config S390
  66         def_bool y
  67         select ARCH_HAS_DEVMEM_IS_ALLOWED
  68         select ARCH_HAS_ELF_RANDOMIZE
  69         select ARCH_HAS_GCOV_PROFILE_ALL
  70         select ARCH_HAS_GIGANTIC_PAGE
  71         select ARCH_HAS_KCOV
  72         select ARCH_HAS_SET_MEMORY
  73         select ARCH_HAS_SG_CHAIN
  74         select ARCH_HAS_STRICT_KERNEL_RWX
  75         select ARCH_HAS_STRICT_MODULE_RWX
  76         select ARCH_HAS_UBSAN_SANITIZE_ALL
  77         select ARCH_HAVE_NMI_SAFE_CMPXCHG
  78         select ARCH_INLINE_READ_LOCK
  79         select ARCH_INLINE_READ_LOCK_BH
  80         select ARCH_INLINE_READ_LOCK_IRQ
  81         select ARCH_INLINE_READ_LOCK_IRQSAVE
  82         select ARCH_INLINE_READ_TRYLOCK
  83         select ARCH_INLINE_READ_UNLOCK
  84         select ARCH_INLINE_READ_UNLOCK_BH
  85         select ARCH_INLINE_READ_UNLOCK_IRQ
  86         select ARCH_INLINE_READ_UNLOCK_IRQRESTORE
  87         select ARCH_INLINE_SPIN_LOCK
  88         select ARCH_INLINE_SPIN_LOCK_BH
  89         select ARCH_INLINE_SPIN_LOCK_IRQ
  90         select ARCH_INLINE_SPIN_LOCK_IRQSAVE
  91         select ARCH_INLINE_SPIN_TRYLOCK
  92         select ARCH_INLINE_SPIN_TRYLOCK_BH
  93         select ARCH_INLINE_SPIN_UNLOCK
  94         select ARCH_INLINE_SPIN_UNLOCK_BH
  95         select ARCH_INLINE_SPIN_UNLOCK_IRQ
  96         select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE
  97         select ARCH_INLINE_WRITE_LOCK
  98         select ARCH_INLINE_WRITE_LOCK_BH
  99         select ARCH_INLINE_WRITE_LOCK_IRQ
 100         select ARCH_INLINE_WRITE_LOCK_IRQSAVE
 101         select ARCH_INLINE_WRITE_TRYLOCK
 102         select ARCH_INLINE_WRITE_UNLOCK
 103         select ARCH_INLINE_WRITE_UNLOCK_BH
 104         select ARCH_INLINE_WRITE_UNLOCK_IRQ
 105         select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE
 106         select ARCH_SAVE_PAGE_KEYS if HIBERNATION
 107         select ARCH_SUPPORTS_ATOMIC_RMW
 108         select ARCH_SUPPORTS_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_WANTS_UBSAN_NO_NULL
 114         select ARCH_WANT_IPC_PARSE_VERSION
 115         select BUILDTIME_EXTABLE_SORT
 116         select CLONE_BACKWARDS2
 117         select DYNAMIC_FTRACE if FUNCTION_TRACER
 118         select GENERIC_CLOCKEVENTS
 119         select GENERIC_CPU_AUTOPROBE
 120         select GENERIC_CPU_DEVICES if !SMP
 121         select GENERIC_FIND_FIRST_BIT
 122         select GENERIC_SMP_IDLE_THREAD
 123         select GENERIC_TIME_VSYSCALL
 124         select HAVE_ALIGNED_STRUCT_PAGE if SLUB
 125         select HAVE_ARCH_AUDITSYSCALL
 126         select HAVE_ARCH_EARLY_PFN_TO_NID
 127         select HAVE_ARCH_HARDENED_USERCOPY
 128         select HAVE_ARCH_JUMP_LABEL
 129         select CPU_NO_EFFICIENT_FFS if !HAVE_MARCH_Z9_109_FEATURES
 130         select HAVE_ARCH_SECCOMP_FILTER
 131         select HAVE_ARCH_SOFT_DIRTY
 132         select HAVE_ARCH_TRACEHOOK
 133         select HAVE_ARCH_TRANSPARENT_HUGEPAGE
 134         select HAVE_EBPF_JIT if PACK_STACK && HAVE_MARCH_Z196_FEATURES
 135         select HAVE_CMPXCHG_DOUBLE
 136         select HAVE_CMPXCHG_LOCAL
 137         select HAVE_DEBUG_KMEMLEAK
 138         select HAVE_DMA_API_DEBUG
 139         select HAVE_DMA_CONTIGUOUS
 140         select DMA_NOOP_OPS
 141         select HAVE_DYNAMIC_FTRACE
 142         select HAVE_DYNAMIC_FTRACE_WITH_REGS
 143         select HAVE_EFFICIENT_UNALIGNED_ACCESS
 144         select HAVE_EXIT_THREAD
 145         select HAVE_FTRACE_MCOUNT_RECORD
 146         select HAVE_FUNCTION_GRAPH_TRACER
 147         select HAVE_FUNCTION_TRACER
 148         select HAVE_FUTEX_CMPXCHG if FUTEX
 149         select HAVE_KERNEL_BZIP2
 150         select HAVE_KERNEL_GZIP
 151         select HAVE_KERNEL_LZ4
 152         select HAVE_KERNEL_LZMA
 153         select HAVE_KERNEL_LZO
 154         select HAVE_KERNEL_XZ
 155         select HAVE_KPROBES
 156         select HAVE_KRETPROBES
 157         select HAVE_KVM
 158         select HAVE_LIVEPATCH
 159         select HAVE_MEMBLOCK
 160         select HAVE_MEMBLOCK_NODE_MAP
 161         select HAVE_MEMBLOCK_PHYS_MAP
 162         select HAVE_MOD_ARCH_SPECIFIC
 163         select HAVE_OPROFILE
 164         select HAVE_PERF_EVENTS
 165         select HAVE_REGS_AND_STACK_ACCESS_API
 166         select HAVE_SYSCALL_TRACEPOINTS
 167         select HAVE_VIRT_CPU_ACCOUNTING
 168         select MODULES_USE_ELF_RELA
 169         select NO_BOOTMEM
 170         select OLD_SIGACTION
 171         select OLD_SIGSUSPEND3
 172         select SPARSE_IRQ
 173         select SYSCTL_EXCEPTION_TRACE
 174         select THREAD_INFO_IN_TASK
 175         select TTY
 176         select VIRT_CPU_ACCOUNTING
 177         select ARCH_HAS_SCALED_CPUTIME
 178         select VIRT_TO_BUS
 179         select HAVE_NMI
 180
 181
 182 config SCHED_OMIT_FRAME_POINTER
 183         def_bool y
 184
 185 config PGTABLE_LEVELS
 186         int
 187         default 4
 188
 189 source "init/Kconfig"
 190
 191 source "kernel/Kconfig.freezer"
 192
 193 source "kernel/livepatch/Kconfig"
 194
 195 menu "Processor type and features"
 196
 197 config HAVE_MARCH_Z900_FEATURES
 198         def_bool n
 199
 200 config HAVE_MARCH_Z990_FEATURES
 201         def_bool n
 202         select HAVE_MARCH_Z900_FEATURES
 203
 204 config HAVE_MARCH_Z9_109_FEATURES
 205         def_bool n
 206         select HAVE_MARCH_Z990_FEATURES
 207
 208 config HAVE_MARCH_Z10_FEATURES
 209         def_bool n
 210         select HAVE_MARCH_Z9_109_FEATURES
 211
 212 config HAVE_MARCH_Z196_FEATURES
 213         def_bool n
 214         select HAVE_MARCH_Z10_FEATURES
 215
 216 config HAVE_MARCH_ZEC12_FEATURES
 217         def_bool n
 218         select HAVE_MARCH_Z196_FEATURES
 219
 220 config HAVE_MARCH_Z13_FEATURES
 221         def_bool n
 222         select HAVE_MARCH_ZEC12_FEATURES
 223
 224 choice
 225         prompt "Processor type"
 226         default MARCH_Z196
 227
 228 config MARCH_Z900
 229         bool "IBM zSeries model z800 and z900"
 230         select HAVE_MARCH_Z900_FEATURES
 231         help
 232           Select this to enable optimizations for model z800/z900 (2064 and
 233           2066 series). This will enable some optimizations that are not
 234           available on older ESA/390 (31 Bit) only CPUs.
 235
 236 config MARCH_Z990
 237         bool "IBM zSeries model z890 and z990"
 238         select HAVE_MARCH_Z990_FEATURES
 239         help
 240           Select this to enable optimizations for model z890/z990 (2084 and
 241           2086 series). The kernel will be slightly faster but will not work
 242           on older machines.
 243
 244 config MARCH_Z9_109
 245         bool "IBM System z9"
 246         select HAVE_MARCH_Z9_109_FEATURES
 247         help
 248           Select this to enable optimizations for IBM System z9 (2094 and
 249           2096 series). The kernel will be slightly faster but will not work
 250           on older machines.
 251
 252 config MARCH_Z10
 253         bool "IBM System z10"
 254         select HAVE_MARCH_Z10_FEATURES
 255         help
 256           Select this to enable optimizations for IBM System z10 (2097 and
 257           2098 series). The kernel will be slightly faster but will not work
 258           on older machines.
 259
 260 config MARCH_Z196
 261         bool "IBM zEnterprise 114 and 196"
 262         select HAVE_MARCH_Z196_FEATURES
 263         help
 264           Select this to enable optimizations for IBM zEnterprise 114 and 196
 265           (2818 and 2817 series). The kernel will be slightly faster but will
 266           not work on older machines.
 267
 268 config MARCH_ZEC12
 269         bool "IBM zBC12 and zEC12"
 270         select HAVE_MARCH_ZEC12_FEATURES
 271         help
 272           Select this to enable optimizations for IBM zBC12 and zEC12 (2828 and
 273           2827 series). The kernel will be slightly faster but will not work on
 274           older machines.
 275
 276 config MARCH_Z13
 277         bool "IBM z13s and z13"
 278         select HAVE_MARCH_Z13_FEATURES
 279         help
 280           Select this to enable optimizations for IBM z13s and z13 (2965 and
 281           2964 series). The kernel will be slightly faster but will not work on
 282           older machines.
 283
 284 endchoice
 285
 286 config MARCH_Z900_TUNE
 287         def_bool TUNE_Z900 || MARCH_Z900 && TUNE_DEFAULT
 288
 289 config MARCH_Z990_TUNE
 290         def_bool TUNE_Z990 || MARCH_Z990 && TUNE_DEFAULT
 291
 292 config MARCH_Z9_109_TUNE
 293         def_bool TUNE_Z9_109 || MARCH_Z9_109 && TUNE_DEFAULT
 294
 295 config MARCH_Z10_TUNE
 296         def_bool TUNE_Z10 || MARCH_Z10 && TUNE_DEFAULT
 297
 298 config MARCH_Z196_TUNE
 299         def_bool TUNE_Z196 || MARCH_Z196 && TUNE_DEFAULT
 300
 301 config MARCH_ZEC12_TUNE
 302         def_bool TUNE_ZEC12 || MARCH_ZEC12 && TUNE_DEFAULT
 303
 304 config MARCH_Z13_TUNE
 305         def_bool TUNE_Z13 || MARCH_Z13 && TUNE_DEFAULT
 306
 307 choice
 308         prompt "Tune code generation"
 309         default TUNE_DEFAULT
 310         help
 311           Cause the compiler to tune (-mtune) the generated code for a machine.
 312           This will make the code run faster on the selected machine but
 313           somewhat slower on other machines.
 314           This option only changes how the compiler emits instructions, not the
 315           selection of instructions itself, so the resulting kernel will run on
 316           all other machines.
 317
 318 config TUNE_DEFAULT
 319         bool "Default"
 320         help
 321           Tune the generated code for the target processor for which the kernel
 322           will be compiled.
 323
 324 config TUNE_Z900
 325         bool "IBM zSeries model z800 and z900"
 326
 327 config TUNE_Z990
 328         bool "IBM zSeries model z890 and z990"
 329
 330 config TUNE_Z9_109
 331         bool "IBM System z9"
 332
 333 config TUNE_Z10
 334         bool "IBM System z10"
 335
 336 config TUNE_Z196
 337         bool "IBM zEnterprise 114 and 196"
 338
 339 config TUNE_ZEC12
 340         bool "IBM zBC12 and zEC12"
 341
 342 config TUNE_Z13
 343         bool "IBM z13"
 344
 345 endchoice
 346
 347 config 64BIT
 348         def_bool y
 349
 350 config COMPAT
 351         def_bool y
 352         prompt "Kernel support for 31 bit emulation"
 353         select COMPAT_BINFMT_ELF if BINFMT_ELF
 354         select ARCH_WANT_OLD_COMPAT_IPC
 355         select COMPAT_OLD_SIGACTION
 356         depends on MULTIUSER
 357         help
 358           Select this option if you want to enable your system kernel to
 359           handle system-calls from ELF binaries for 31 bit ESA.  This option
 360           (and some other stuff like libraries and such) is needed for
 361           executing 31 bit applications.  It is safe to say "Y".
 362
 363 config SYSVIPC_COMPAT
 364         def_bool y if COMPAT && SYSVIPC
 365
 366 config KEYS_COMPAT
 367         def_bool y if COMPAT && KEYS
 368
 369 config SMP
 370         def_bool y
 371         prompt "Symmetric multi-processing support"
 372         ---help---
 373           This enables support for systems with more than one CPU. If you have
 374           a system with only one CPU, like most personal computers, say N. If
 375           you have a system with more than one CPU, say Y.
 376
 377           If you say N here, the kernel will run on uni- and multiprocessor
 378           machines, but will use only one CPU of a multiprocessor machine. If
 379           you say Y here, the kernel will run on many, but not all,
 380           uniprocessor machines. On a uniprocessor machine, the kernel
 381           will run faster if you say N here.
 382
 383           See also the SMP-HOWTO available at
 384           <http://www.tldp.org/docs.html#howto>.
 385
 386           Even if you don't know what to do here, say Y.
 387
 388 config NR_CPUS
 389         int "Maximum number of CPUs (2-512)"
 390         range 2 512
 391         depends on SMP
 392         default "64"
 393         help
 394           This allows you to specify the maximum number of CPUs which this
 395           kernel will support. The maximum supported value is 512 and the
 396           minimum value which makes sense is 2.
 397
 398           This is purely to save memory - each supported CPU adds
 399           approximately sixteen kilobytes to the kernel image.
 400
 401 config HOTPLUG_CPU
 402         def_bool y
 403         prompt "Support for hot-pluggable CPUs"
 404         depends on SMP
 405         help
 406           Say Y here to be able to turn CPUs off and on. CPUs
 407           can be controlled through /sys/devices/system/cpu/cpu#.
 408           Say N if you want to disable CPU hotplug.
 409
 410 # Some NUMA nodes have memory ranges that span
 411 # other nodes.  Even though a pfn is valid and
 412 # between a node's start and end pfns, it may not
 413 # reside on that node.  See memmap_init_zone()
 414 # for details. <- They meant memory holes!
 415 config NODES_SPAN_OTHER_NODES
 416         def_bool NUMA
 417
 418 config NUMA
 419         bool "NUMA support"
 420         depends on SMP && SCHED_TOPOLOGY
 421         default n
 422         help
 423           Enable NUMA support
 424
 425           This option adds NUMA support to the kernel.
 426
 427           An operation mode can be selected by appending
 428           numa=<method> to the kernel command line.
 429
 430           The default behaviour is identical to appending numa=plain to
 431           the command line. This will create just one node with all
 432           available memory and all CPUs in it.
 433
 434 config NODES_SHIFT
 435         int "Maximum NUMA nodes (as a power of 2)"
 436         range 1 10
 437         depends on NUMA
 438         default "4"
 439         help
 440           Specify the maximum number of NUMA nodes available on the target
 441           system. Increases memory reserved to accommodate various tables.
 442
 443 menu "Select NUMA modes"
 444         depends on NUMA
 445
 446 config NUMA_EMU
 447         bool "NUMA emulation"
 448         default y
 449         help
 450           Numa emulation mode will split the available system memory into
 451           equal chunks which then are distributed over the configured number
 452           of nodes in a round-robin manner.
 453
 454           The number of fake nodes is limited by the number of available memory
 455           chunks (i.e. memory size / fake size) and the number of supported
 456           nodes in the kernel.
 457
 458           The CPUs are assigned to the nodes in a way that partially respects
 459           the original machine topology (if supported by the machine).
 460           Fair distribution of the CPUs is not guaranteed.
 461
 462 config EMU_SIZE
 463         hex "NUMA emulation memory chunk size"
 464         default 0x10000000
 465         range 0x400000 0x100000000
 466         depends on NUMA_EMU
 467         help
 468           Select the default size by which the memory is chopped and then
 469           assigned to emulated NUMA nodes.
 470
 471           This can be overridden by specifying
 472
 473           emu_size=<n>
 474
 475           on the kernel command line where also suffixes K, M, G, and T are
 476           supported.
 477
 478 endmenu
 479
 480 config SCHED_SMT
 481         def_bool n
 482
 483 config SCHED_MC
 484         def_bool n
 485
 486 config SCHED_BOOK
 487         def_bool n
 488
 489 config SCHED_DRAWER
 490         def_bool n
 491
 492 config SCHED_TOPOLOGY
 493         def_bool y
 494         prompt "Topology scheduler support"
 495         depends on SMP
 496         select SCHED_SMT
 497         select SCHED_MC
 498         select SCHED_BOOK
 499         select SCHED_DRAWER
 500         help
 501           Topology scheduler support improves the CPU scheduler's decision
 502           making when dealing with machines that have multi-threading,
 503           multiple cores or multiple books.
 504
 505 source kernel/Kconfig.preempt
 506
 507 source kernel/Kconfig.hz
 508
 509 endmenu
 510
 511 menu "Memory setup"
 512
 513 config ARCH_SPARSEMEM_ENABLE
 514         def_bool y
 515         select SPARSEMEM_VMEMMAP_ENABLE
 516         select SPARSEMEM_VMEMMAP
 517
 518 config ARCH_SPARSEMEM_DEFAULT
 519         def_bool y
 520
 521 config ARCH_SELECT_MEMORY_MODEL
 522         def_bool y
 523
 524 config ARCH_ENABLE_MEMORY_HOTPLUG
 525         def_bool y if SPARSEMEM
 526
 527 config ARCH_ENABLE_MEMORY_HOTREMOVE
 528         def_bool y
 529
 530 config ARCH_ENABLE_SPLIT_PMD_PTLOCK
 531         def_bool y
 532
 533 config FORCE_MAX_ZONEORDER
 534         int
 535         default "9"
 536
 537 source "mm/Kconfig"
 538
 539 config PACK_STACK
 540         def_bool y
 541         prompt "Pack kernel stack"
 542         help
 543           This option enables the compiler option -mkernel-backchain if it
 544           is available. If the option is available the compiler supports
 545           the new stack layout which dramatically reduces the minimum stack
 546           frame size. With an old compiler a non-leaf function needs a
 547           minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
 548           -mkernel-backchain the minimum size drops to 16 byte on 31 bit
 549           and 24 byte on 64 bit.
 550
 551           Say Y if you are unsure.
 552
 553 config CHECK_STACK
 554         def_bool y
 555         prompt "Detect kernel stack overflow"
 556         help
 557           This option enables the compiler option -mstack-guard and
 558           -mstack-size if they are available. If the compiler supports them
 559           it will emit additional code to each function prolog to trigger
 560           an illegal operation if the kernel stack is about to overflow.
 561
 562           Say N if you are unsure.
 563
 564 config STACK_GUARD
 565         int "Size of the guard area (128-1024)"
 566         range 128 1024
 567         depends on CHECK_STACK
 568         default "256"
 569         help
 570           This allows you to specify the size of the guard area at the lower
 571           end of the kernel stack. If the kernel stack points into the guard
 572           area on function entry an illegal operation is triggered. The size
 573           needs to be a power of 2. Please keep in mind that the size of an
 574           interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
 575           The minimum size for the stack guard should be 256 for 31 bit and
 576           512 for 64 bit.
 577
 578 config WARN_DYNAMIC_STACK
 579         def_bool n
 580         prompt "Emit compiler warnings for function with dynamic stack usage"
 581         help
 582           This option enables the compiler option -mwarn-dynamicstack. If the
 583           compiler supports this options generates warnings for functions
 584           that dynamically allocate stack space using alloca.
 585
 586           Say N if you are unsure.
 587
 588 endmenu
 589
 590 menu "I/O subsystem"
 591
 592 config QDIO
 593         def_tristate y
 594         prompt "QDIO support"
 595         ---help---
 596           This driver provides the Queued Direct I/O base support for
 597           IBM System z.
 598
 599           To compile this driver as a module, choose M here: the
 600           module will be called qdio.
 601
 602           If unsure, say Y.
 603
 604 menuconfig PCI
 605         bool "PCI support"
 606         select PCI_MSI
 607         select IOMMU_SUPPORT
 608         help
 609           Enable PCI support.
 610
 611 if PCI
 612
 613 config PCI_NR_FUNCTIONS
 614         int "Maximum number of PCI functions (1-4096)"
 615         range 1 4096
 616         default "64"
 617         help
 618           This allows you to specify the maximum number of PCI functions which
 619           this kernel will support.
 620
 621 source "drivers/pci/Kconfig"
 622
 623 endif   # PCI
 624
 625 config PCI_DOMAINS
 626         def_bool PCI
 627
 628 config HAS_IOMEM
 629         def_bool PCI
 630
 631 config IOMMU_HELPER
 632         def_bool PCI
 633
 634 config NEED_SG_DMA_LENGTH
 635         def_bool PCI
 636
 637 config NEED_DMA_MAP_STATE
 638         def_bool PCI
 639
 640 config CHSC_SCH
 641         def_tristate m
 642         prompt "Support for CHSC subchannels"
 643         help
 644           This driver allows usage of CHSC subchannels. A CHSC subchannel
 645           is usually present on LPAR only.
 646           The driver creates a device /dev/chsc, which may be used to
 647           obtain I/O configuration information about the machine and
 648           to issue asynchronous chsc commands (DANGEROUS).
 649           You will usually only want to use this interface on a special
 650           LPAR designated for system management.
 651
 652           To compile this driver as a module, choose M here: the
 653           module will be called chsc_sch.
 654
 655           If unsure, say N.
 656
 657 config SCM_BUS
 658         def_bool y
 659         prompt "SCM bus driver"
 660         help
 661           Bus driver for Storage Class Memory.
 662
 663 config EADM_SCH
 664         def_tristate m
 665         prompt "Support for EADM subchannels"
 666         depends on SCM_BUS
 667         help
 668           This driver allows usage of EADM subchannels. EADM subchannels act
 669           as a communication vehicle for SCM increments.
 670
 671           To compile this driver as a module, choose M here: the
 672           module will be called eadm_sch.
 673
 674 endmenu
 675
 676 menu "Dump support"
 677
 678 config CRASH_DUMP
 679         bool "kernel crash dumps"
 680         depends on SMP
 681         select KEXEC
 682         help
 683           Generate crash dump after being started by kexec.
 684           Crash dump kernels are loaded in the main kernel with kexec-tools
 685           into a specially reserved region and then later executed after
 686           a crash by kdump/kexec.
 687           Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this.
 688           This option also enables s390 zfcpdump.
 689           See also <file:Documentation/s390/zfcpdump.txt>
 690
 691 endmenu
 692
 693 menu "Executable file formats / Emulations"
 694
 695 source "fs/Kconfig.binfmt"
 696
 697 config SECCOMP
 698         def_bool y
 699         prompt "Enable seccomp to safely compute untrusted bytecode"
 700         depends on PROC_FS
 701         help
 702           This kernel feature is useful for number crunching applications
 703           that may need to compute untrusted bytecode during their
 704           execution. By using pipes or other transports made available to
 705           the process as file descriptors supporting the read/write
 706           syscalls, it's possible to isolate those applications in
 707           their own address space using seccomp. Once seccomp is
 708           enabled via /proc/<pid>/seccomp, it cannot be disabled
 709           and the task is only allowed to execute a few safe syscalls
 710           defined by each seccomp mode.
 711
 712           If unsure, say Y.
 713
 714 endmenu
 715
 716 menu "Power Management"
 717
 718 config ARCH_HIBERNATION_POSSIBLE
 719         def_bool y
 720
 721 source "kernel/power/Kconfig"
 722
 723 endmenu
 724
 725 source "net/Kconfig"
 726
 727 config PCMCIA
 728         def_bool n
 729
 730 config CCW
 731         def_bool y
 732
 733 source "drivers/Kconfig"
 734
 735 source "fs/Kconfig"
 736
 737 source "arch/s390/Kconfig.debug"
 738
 739 source "security/Kconfig"
 740
 741 source "crypto/Kconfig"
 742
 743 source "lib/Kconfig"
 744
 745 menu "Virtualization"
 746
 747 config PFAULT
 748         def_bool y
 749         prompt "Pseudo page fault support"
 750         help
 751           Select this option, if you want to use PFAULT pseudo page fault
 752           handling under VM. If running native or in LPAR, this option
 753           has no effect. If your VM does not support PFAULT, PAGEEX
 754           pseudo page fault handling will be used.
 755           Note that VM 4.2 supports PFAULT but has a bug in its
 756           implementation that causes some problems.
 757           Everybody who wants to run Linux under VM != VM4.2 should select
 758           this option.
 759
 760 config SHARED_KERNEL
 761         bool "VM shared kernel support"
 762         depends on !JUMP_LABEL
 763         help
 764           Select this option, if you want to share the text segment of the
 765           Linux kernel between different VM guests. This reduces memory
 766           usage with lots of guests but greatly increases kernel size.
 767           Also if a kernel was IPL'ed from a shared segment the kexec system
 768           call will not work.
 769           You should only select this option if you know what you are
 770           doing and want to exploit this feature.
 771
 772 config CMM
 773         def_tristate n
 774         prompt "Cooperative memory management"
 775         help
 776           Select this option, if you want to enable the kernel interface
 777           to reduce the memory size of the system. This is accomplished
 778           by allocating pages of memory and put them "on hold". This only
 779           makes sense for a system running under VM where the unused pages
 780           will be reused by VM for other guest systems. The interface
 781           allows an external monitor to balance memory of many systems.
 782           Everybody who wants to run Linux under VM should select this
 783           option.
 784
 785 config CMM_IUCV
 786         def_bool y
 787         prompt "IUCV special message interface to cooperative memory management"
 788         depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
 789         help
 790           Select this option to enable the special message interface to
 791           the cooperative memory management.
 792
 793 config APPLDATA_BASE
 794         def_bool n
 795         prompt "Linux - VM Monitor Stream, base infrastructure"
 796         depends on PROC_FS
 797         help
 798           This provides a kernel interface for creating and updating z/VM APPLDATA
 799           monitor records. The monitor records are updated at certain time
 800           intervals, once the timer is started.
 801           Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
 802           i.e. enables or disables monitoring on the Linux side.
 803           A custom interval value (in seconds) can be written to
 804           /proc/appldata/interval.
 805
 806           Defaults are 60 seconds interval and timer off.
 807           The /proc entries can also be read from, showing the current settings.
 808
 809 config APPLDATA_MEM
 810         def_tristate m
 811         prompt "Monitor memory management statistics"
 812         depends on APPLDATA_BASE && VM_EVENT_COUNTERS
 813         help
 814           This provides memory management related data to the Linux - VM Monitor
 815           Stream, like paging/swapping rate, memory utilisation, etc.
 816           Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
 817           APPLDATA monitor record, i.e. enables or disables monitoring this record
 818           on the z/VM side.
 819
 820           Default is disabled.
 821           The /proc entry can also be read from, showing the current settings.
 822
 823           This can also be compiled as a module, which will be called
 824           appldata_mem.o.
 825
 826 config APPLDATA_OS
 827         def_tristate m
 828         prompt "Monitor OS statistics"
 829         depends on APPLDATA_BASE
 830         help
 831           This provides OS related data to the Linux - VM Monitor Stream, like
 832           CPU utilisation, etc.
 833           Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
 834           APPLDATA monitor record, i.e. enables or disables monitoring this record
 835           on the z/VM side.
 836
 837           Default is disabled.
 838           This can also be compiled as a module, which will be called
 839           appldata_os.o.
 840
 841 config APPLDATA_NET_SUM
 842         def_tristate m
 843         prompt "Monitor overall network statistics"
 844         depends on APPLDATA_BASE && NET
 845         help
 846           This provides network related data to the Linux - VM Monitor Stream,
 847           currently there is only a total sum of network I/O statistics, no
 848           per-interface data.
 849           Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
 850           APPLDATA monitor record, i.e. enables or disables monitoring this record
 851           on the z/VM side.
 852
 853           Default is disabled.
 854           This can also be compiled as a module, which will be called
 855           appldata_net_sum.o.
 856
 857 config S390_HYPFS_FS
 858         def_bool y
 859         prompt "s390 hypervisor file system support"
 860         select SYS_HYPERVISOR
 861         help
 862           This is a virtual file system intended to provide accounting
 863           information in an s390 hypervisor environment.
 864
 865 source "arch/s390/kvm/Kconfig"
 866
 867 config S390_GUEST
 868         def_bool y
 869         prompt "s390 support for virtio devices"
 870         select TTY
 871         select VIRTUALIZATION
 872         select VIRTIO
 873         select VIRTIO_CONSOLE
 874         help
 875           Enabling this option adds support for virtio based paravirtual device
 876           drivers on s390.
 877
 878           Select this option if you want to run the kernel as a guest under
 879           the KVM hypervisor.
 880
 881 config S390_GUEST_OLD_TRANSPORT
 882         def_bool y
 883         prompt "Guest support for old s390 virtio transport (DEPRECATED)"
 884         depends on S390_GUEST
 885         help
 886           Enable this option to add support for the old s390-virtio
 887           transport (i.e. virtio devices NOT based on virtio-ccw). This
 888           type of virtio devices is only available on the experimental
 889           kuli userspace or with old (< 2.6) qemu. If you are running
 890           with a modern version of qemu (which supports virtio-ccw since
 891           1.4 and uses it by default since version 2.4), you probably won't
 892           need this.
 893
 894 endmenu