arch/s390/Kconfig

   1 config MMU
   2         def_bool y
   3
   4 config ZONE_DMA
   5         def_bool y
   6
   7 config LOCKDEP_SUPPORT
   8         def_bool y
   9
  10 config STACKTRACE_SUPPORT
  11         def_bool y
  12
  13 config HAVE_LATENCYTOP_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 64BIT
  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
  52 config AUDIT_ARCH
  53         def_bool y
  54
  55 config NO_IOPORT
  56         def_bool y
  57
  58 config PCI_QUIRKS
  59         def_bool n
  60
  61 config S390
  62         def_bool y
  63         select ARCH_DISCARD_MEMBLOCK
  64         select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
  65         select ARCH_HAVE_NMI_SAFE_CMPXCHG
  66         select ARCH_INLINE_READ_LOCK
  67         select ARCH_INLINE_READ_LOCK_BH
  68         select ARCH_INLINE_READ_LOCK_IRQ
  69         select ARCH_INLINE_READ_LOCK_IRQSAVE
  70         select ARCH_INLINE_READ_TRYLOCK
  71         select ARCH_INLINE_READ_UNLOCK
  72         select ARCH_INLINE_READ_UNLOCK_BH
  73         select ARCH_INLINE_READ_UNLOCK_IRQ
  74         select ARCH_INLINE_READ_UNLOCK_IRQRESTORE
  75         select ARCH_INLINE_SPIN_LOCK
  76         select ARCH_INLINE_SPIN_LOCK_BH
  77         select ARCH_INLINE_SPIN_LOCK_IRQ
  78         select ARCH_INLINE_SPIN_LOCK_IRQSAVE
  79         select ARCH_INLINE_SPIN_TRYLOCK
  80         select ARCH_INLINE_SPIN_TRYLOCK_BH
  81         select ARCH_INLINE_SPIN_UNLOCK
  82         select ARCH_INLINE_SPIN_UNLOCK_BH
  83         select ARCH_INLINE_SPIN_UNLOCK_IRQ
  84         select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE
  85         select ARCH_INLINE_WRITE_LOCK
  86         select ARCH_INLINE_WRITE_LOCK_BH
  87         select ARCH_INLINE_WRITE_LOCK_IRQ
  88         select ARCH_INLINE_WRITE_LOCK_IRQSAVE
  89         select ARCH_INLINE_WRITE_TRYLOCK
  90         select ARCH_INLINE_WRITE_UNLOCK
  91         select ARCH_INLINE_WRITE_UNLOCK_BH
  92         select ARCH_INLINE_WRITE_UNLOCK_IRQ
  93         select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE
  94         select ARCH_HAS_DEBUG_STRICT_USER_COPY_CHECKS
  95         select ARCH_SAVE_PAGE_KEYS if HIBERNATION
  96         select ARCH_WANT_IPC_PARSE_VERSION
  97         select BUILDTIME_EXTABLE_SORT
  98         select CLONE_BACKWARDS2
  99         select GENERIC_CLOCKEVENTS
 100         select GENERIC_CPU_DEVICES if !SMP
 101         select GENERIC_SMP_IDLE_THREAD
 102         select GENERIC_TIME_VSYSCALL_OLD
 103         select HAVE_ALIGNED_STRUCT_PAGE if SLUB
 104         select HAVE_ARCH_JUMP_LABEL if !MARCH_G5
 105         select HAVE_ARCH_MUTEX_CPU_RELAX
 106         select HAVE_ARCH_SECCOMP_FILTER
 107         select HAVE_ARCH_TRACEHOOK
 108         select HAVE_ARCH_TRANSPARENT_HUGEPAGE if 64BIT
 109         select HAVE_BPF_JIT if 64BIT && PACK_STACK
 110         select HAVE_CMPXCHG_DOUBLE
 111         select HAVE_CMPXCHG_LOCAL
 112         select HAVE_C_RECORDMCOUNT
 113         select HAVE_DEBUG_KMEMLEAK
 114         select HAVE_DYNAMIC_FTRACE
 115         select HAVE_FTRACE_MCOUNT_RECORD
 116         select HAVE_FUNCTION_GRAPH_TRACER
 117         select HAVE_FUNCTION_TRACER
 118         select HAVE_FUNCTION_TRACE_MCOUNT_TEST
 119         select HAVE_KERNEL_BZIP2
 120         select HAVE_KERNEL_GZIP
 121         select HAVE_KERNEL_LZMA
 122         select HAVE_KERNEL_LZO
 123         select HAVE_KERNEL_XZ
 124         select HAVE_KPROBES
 125         select HAVE_KRETPROBES
 126         select HAVE_KVM if 64BIT
 127         select HAVE_MEMBLOCK
 128         select HAVE_MEMBLOCK_NODE_MAP
 129         select HAVE_MOD_ARCH_SPECIFIC
 130         select HAVE_OPROFILE
 131         select HAVE_PERF_EVENTS
 132         select HAVE_REGS_AND_STACK_ACCESS_API
 133         select HAVE_SYSCALL_TRACEPOINTS
 134         select HAVE_UID16 if 32BIT
 135         select HAVE_VIRT_CPU_ACCOUNTING
 136         select VIRT_TO_BUS
 137         select INIT_ALL_POSSIBLE
 138         select KTIME_SCALAR if 32BIT
 139         select MODULES_USE_ELF_RELA
 140         select OLD_SIGSUSPEND3
 141         select OLD_SIGACTION
 142         select SYSCTL_EXCEPTION_TRACE
 143         select USE_GENERIC_SMP_HELPERS if SMP
 144         select VIRT_CPU_ACCOUNTING
 145
 146 config SCHED_OMIT_FRAME_POINTER
 147         def_bool y
 148
 149 source "init/Kconfig"
 150
 151 source "kernel/Kconfig.freezer"
 152
 153 menu "Processor type and features"
 154
 155 config HAVE_MARCH_Z900_FEATURES
 156         def_bool n
 157
 158 config HAVE_MARCH_Z990_FEATURES
 159         def_bool n
 160         select HAVE_MARCH_Z900_FEATURES
 161
 162 config HAVE_MARCH_Z9_109_FEATURES
 163         def_bool n
 164         select HAVE_MARCH_Z990_FEATURES
 165
 166 config HAVE_MARCH_Z10_FEATURES
 167         def_bool n
 168         select HAVE_MARCH_Z9_109_FEATURES
 169
 170 config HAVE_MARCH_Z196_FEATURES
 171         def_bool n
 172         select HAVE_MARCH_Z10_FEATURES
 173
 174 config HAVE_MARCH_ZEC12_FEATURES
 175         def_bool n
 176         select HAVE_MARCH_Z196_FEATURES
 177
 178 choice
 179         prompt "Processor type"
 180         default MARCH_G5
 181
 182 config MARCH_G5
 183         bool "System/390 model G5 and G6"
 184         depends on !64BIT
 185         help
 186           Select this to build a 31 bit kernel that works
 187           on all ESA/390 and z/Architecture machines.
 188
 189 config MARCH_Z900
 190         bool "IBM zSeries model z800 and z900"
 191         select HAVE_MARCH_Z900_FEATURES if 64BIT
 192         help
 193           Select this to enable optimizations for model z800/z900 (2064 and
 194           2066 series). This will enable some optimizations that are not
 195           available on older ESA/390 (31 Bit) only CPUs.
 196
 197 config MARCH_Z990
 198         bool "IBM zSeries model z890 and z990"
 199         select HAVE_MARCH_Z990_FEATURES if 64BIT
 200         help
 201           Select this to enable optimizations for model z890/z990 (2084 and
 202           2086 series). The kernel will be slightly faster but will not work
 203           on older machines.
 204
 205 config MARCH_Z9_109
 206         bool "IBM System z9"
 207         select HAVE_MARCH_Z9_109_FEATURES if 64BIT
 208         help
 209           Select this to enable optimizations for IBM System z9 (2094 and
 210           2096 series). The kernel will be slightly faster but will not work
 211           on older machines.
 212
 213 config MARCH_Z10
 214         bool "IBM System z10"
 215         select HAVE_MARCH_Z10_FEATURES if 64BIT
 216         help
 217           Select this to enable optimizations for IBM System z10 (2097 and
 218           2098 series). The kernel will be slightly faster but will not work
 219           on older machines.
 220
 221 config MARCH_Z196
 222         bool "IBM zEnterprise 114 and 196"
 223         select HAVE_MARCH_Z196_FEATURES if 64BIT
 224         help
 225           Select this to enable optimizations for IBM zEnterprise 114 and 196
 226           (2818 and 2817 series). The kernel will be slightly faster but will
 227           not work on older machines.
 228
 229 config MARCH_ZEC12
 230         bool "IBM zEC12"
 231         select HAVE_MARCH_ZEC12_FEATURES if 64BIT
 232         help
 233           Select this to enable optimizations for IBM zEC12 (2827 series). The
 234           kernel will be slightly faster but will not work on older machines.
 235
 236 endchoice
 237
 238 config 64BIT
 239         def_bool y
 240         prompt "64 bit kernel"
 241         help
 242           Select this option if you have an IBM z/Architecture machine
 243           and want to use the 64 bit addressing mode.
 244
 245 config 32BIT
 246         def_bool y if !64BIT
 247
 248 config COMPAT
 249         def_bool y
 250         prompt "Kernel support for 31 bit emulation"
 251         depends on 64BIT
 252         select COMPAT_BINFMT_ELF if BINFMT_ELF
 253         select ARCH_WANT_OLD_COMPAT_IPC
 254         select COMPAT_OLD_SIGACTION
 255         help
 256           Select this option if you want to enable your system kernel to
 257           handle system-calls from ELF binaries for 31 bit ESA.  This option
 258           (and some other stuff like libraries and such) is needed for
 259           executing 31 bit applications.  It is safe to say "Y".
 260
 261 config SYSVIPC_COMPAT
 262         def_bool y if COMPAT && SYSVIPC
 263
 264 config KEYS_COMPAT
 265         def_bool y if COMPAT && KEYS
 266
 267 config SMP
 268         def_bool y
 269         prompt "Symmetric multi-processing support"
 270         ---help---
 271           This enables support for systems with more than one CPU. If you have
 272           a system with only one CPU, like most personal computers, say N. If
 273           you have a system with more than one CPU, say Y.
 274
 275           If you say N here, the kernel will run on single and multiprocessor
 276           machines, but will use only one CPU of a multiprocessor machine. If
 277           you say Y here, the kernel will run on many, but not all,
 278           singleprocessor machines. On a singleprocessor machine, the kernel
 279           will run faster if you say N here.
 280
 281           See also the SMP-HOWTO available at
 282           <http://www.tldp.org/docs.html#howto>.
 283
 284           Even if you don't know what to do here, say Y.
 285
 286 config NR_CPUS
 287         int "Maximum number of CPUs (2-64)"
 288         range 2 64
 289         depends on SMP
 290         default "32" if !64BIT
 291         default "64" if 64BIT
 292         help
 293           This allows you to specify the maximum number of CPUs which this
 294           kernel will support.  The maximum supported value is 64 and the
 295           minimum value which makes sense is 2.
 296
 297           This is purely to save memory - each supported CPU adds
 298           approximately sixteen kilobytes to the kernel image.
 299
 300 config HOTPLUG_CPU
 301         def_bool y
 302         prompt "Support for hot-pluggable CPUs"
 303         depends on SMP
 304         help
 305           Say Y here to be able to turn CPUs off and on. CPUs
 306           can be controlled through /sys/devices/system/cpu/cpu#.
 307           Say N if you want to disable CPU hotplug.
 308
 309 config SCHED_MC
 310         def_bool n
 311
 312 config SCHED_BOOK
 313         def_bool y
 314         prompt "Book scheduler support"
 315         depends on SMP
 316         select SCHED_MC
 317         help
 318           Book scheduler support improves the CPU scheduler's decision making
 319           when dealing with machines that have several books.
 320
 321 source kernel/Kconfig.preempt
 322
 323 config MATHEMU
 324         def_bool y
 325         prompt "IEEE FPU emulation"
 326         depends on MARCH_G5
 327         help
 328           This option is required for IEEE compliant floating point arithmetic
 329           on older ESA/390 machines. Say Y unless you know your machine doesn't
 330           need this.
 331
 332 source kernel/Kconfig.hz
 333
 334 endmenu
 335
 336 menu "Memory setup"
 337
 338 config ARCH_SPARSEMEM_ENABLE
 339         def_bool y
 340         select SPARSEMEM_VMEMMAP_ENABLE
 341         select SPARSEMEM_VMEMMAP
 342         select SPARSEMEM_STATIC if !64BIT
 343
 344 config ARCH_SPARSEMEM_DEFAULT
 345         def_bool y
 346
 347 config ARCH_SELECT_MEMORY_MODEL
 348         def_bool y
 349
 350 config ARCH_ENABLE_MEMORY_HOTPLUG
 351         def_bool y if SPARSEMEM
 352
 353 config ARCH_ENABLE_MEMORY_HOTREMOVE
 354         def_bool y
 355
 356 config FORCE_MAX_ZONEORDER
 357         int
 358         default "9"
 359
 360 source "mm/Kconfig"
 361
 362 config PACK_STACK
 363         def_bool y
 364         prompt "Pack kernel stack"
 365         help
 366           This option enables the compiler option -mkernel-backchain if it
 367           is available. If the option is available the compiler supports
 368           the new stack layout which dramatically reduces the minimum stack
 369           frame size. With an old compiler a non-leaf function needs a
 370           minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
 371           -mkernel-backchain the minimum size drops to 16 byte on 31 bit
 372           and 24 byte on 64 bit.
 373
 374           Say Y if you are unsure.
 375
 376 config CHECK_STACK
 377         def_bool y
 378         prompt "Detect kernel stack overflow"
 379         help
 380           This option enables the compiler option -mstack-guard and
 381           -mstack-size if they are available. If the compiler supports them
 382           it will emit additional code to each function prolog to trigger
 383           an illegal operation if the kernel stack is about to overflow.
 384
 385           Say N if you are unsure.
 386
 387 config STACK_GUARD
 388         int "Size of the guard area (128-1024)"
 389         range 128 1024
 390         depends on CHECK_STACK
 391         default "256"
 392         help
 393           This allows you to specify the size of the guard area at the lower
 394           end of the kernel stack. If the kernel stack points into the guard
 395           area on function entry an illegal operation is triggered. The size
 396           needs to be a power of 2. Please keep in mind that the size of an
 397           interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
 398           The minimum size for the stack guard should be 256 for 31 bit and
 399           512 for 64 bit.
 400
 401 config WARN_DYNAMIC_STACK
 402         def_bool n
 403         prompt "Emit compiler warnings for function with dynamic stack usage"
 404         help
 405           This option enables the compiler option -mwarn-dynamicstack. If the
 406           compiler supports this options generates warnings for functions
 407           that dynamically allocate stack space using alloca.
 408
 409           Say N if you are unsure.
 410
 411 endmenu
 412
 413 menu "I/O subsystem"
 414
 415 config QDIO
 416         def_tristate y
 417         prompt "QDIO support"
 418         ---help---
 419           This driver provides the Queued Direct I/O base support for
 420           IBM System z.
 421
 422           To compile this driver as a module, choose M here: the
 423           module will be called qdio.
 424
 425           If unsure, say Y.
 426
 427 menuconfig PCI
 428         bool "PCI support"
 429         default n
 430         depends on 64BIT
 431         select ARCH_SUPPORTS_MSI
 432         select PCI_MSI
 433         help
 434           Enable PCI support.
 435
 436 if PCI
 437
 438 config PCI_NR_FUNCTIONS
 439         int "Maximum number of PCI functions (1-4096)"
 440         range 1 4096
 441         default "64"
 442         help
 443           This allows you to specify the maximum number of PCI functions which
 444           this kernel will support.
 445
 446 source "drivers/pci/Kconfig"
 447 source "drivers/pci/pcie/Kconfig"
 448 source "drivers/pci/hotplug/Kconfig"
 449
 450 endif   # PCI
 451
 452 config PCI_DOMAINS
 453         def_bool PCI
 454
 455 config HAS_IOMEM
 456         def_bool PCI
 457
 458 config IOMMU_HELPER
 459         def_bool PCI
 460
 461 config HAS_DMA
 462         def_bool PCI
 463         select HAVE_DMA_API_DEBUG
 464
 465 config NEED_SG_DMA_LENGTH
 466         def_bool PCI
 467
 468 config HAVE_DMA_ATTRS
 469         def_bool PCI
 470
 471 config NEED_DMA_MAP_STATE
 472         def_bool PCI
 473
 474 config CHSC_SCH
 475         def_tristate m
 476         prompt "Support for CHSC subchannels"
 477         help
 478           This driver allows usage of CHSC subchannels. A CHSC subchannel
 479           is usually present on LPAR only.
 480           The driver creates a device /dev/chsc, which may be used to
 481           obtain I/O configuration information about the machine and
 482           to issue asynchronous chsc commands (DANGEROUS).
 483           You will usually only want to use this interface on a special
 484           LPAR designated for system management.
 485
 486           To compile this driver as a module, choose M here: the
 487           module will be called chsc_sch.
 488
 489           If unsure, say N.
 490
 491 config SCM_BUS
 492         def_bool y
 493         depends on 64BIT
 494         prompt "SCM bus driver"
 495         help
 496           Bus driver for Storage Class Memory.
 497
 498 config EADM_SCH
 499         def_tristate m
 500         prompt "Support for EADM subchannels"
 501         depends on SCM_BUS
 502         help
 503           This driver allows usage of EADM subchannels. EADM subchannels act
 504           as a communication vehicle for SCM increments.
 505
 506           To compile this driver as a module, choose M here: the
 507           module will be called eadm_sch.
 508
 509 endmenu
 510
 511 menu "Dump support"
 512
 513 config CRASH_DUMP
 514         bool "kernel crash dumps"
 515         depends on 64BIT && SMP
 516         select KEXEC
 517         help
 518           Generate crash dump after being started by kexec.
 519           Crash dump kernels are loaded in the main kernel with kexec-tools
 520           into a specially reserved region and then later executed after
 521           a crash by kdump/kexec.
 522           For more details see Documentation/kdump/kdump.txt
 523
 524 config ZFCPDUMP
 525         def_bool n
 526         prompt "zfcpdump support"
 527         select SMP
 528         help
 529           Select this option if you want to build an zfcpdump enabled kernel.
 530           Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this.
 531
 532 endmenu
 533
 534 menu "Executable file formats / Emulations"
 535
 536 source "fs/Kconfig.binfmt"
 537
 538 config SECCOMP
 539         def_bool y
 540         prompt "Enable seccomp to safely compute untrusted bytecode"
 541         depends on PROC_FS
 542         help
 543           This kernel feature is useful for number crunching applications
 544           that may need to compute untrusted bytecode during their
 545           execution. By using pipes or other transports made available to
 546           the process as file descriptors supporting the read/write
 547           syscalls, it's possible to isolate those applications in
 548           their own address space using seccomp. Once seccomp is
 549           enabled via /proc/<pid>/seccomp, it cannot be disabled
 550           and the task is only allowed to execute a few safe syscalls
 551           defined by each seccomp mode.
 552
 553           If unsure, say Y.
 554
 555 endmenu
 556
 557 menu "Power Management"
 558
 559 config ARCH_HIBERNATION_POSSIBLE
 560         def_bool y if 64BIT
 561
 562 source "kernel/power/Kconfig"
 563
 564 endmenu
 565
 566 source "net/Kconfig"
 567
 568 config PCMCIA
 569         def_bool n
 570
 571 config CCW
 572         def_bool y
 573
 574 source "drivers/Kconfig"
 575
 576 source "fs/Kconfig"
 577
 578 source "arch/s390/Kconfig.debug"
 579
 580 source "security/Kconfig"
 581
 582 source "crypto/Kconfig"
 583
 584 source "lib/Kconfig"
 585
 586 menu "Virtualization"
 587
 588 config PFAULT
 589         def_bool y
 590         prompt "Pseudo page fault support"
 591         help
 592           Select this option, if you want to use PFAULT pseudo page fault
 593           handling under VM. If running native or in LPAR, this option
 594           has no effect. If your VM does not support PFAULT, PAGEEX
 595           pseudo page fault handling will be used.
 596           Note that VM 4.2 supports PFAULT but has a bug in its
 597           implementation that causes some problems.
 598           Everybody who wants to run Linux under VM != VM4.2 should select
 599           this option.
 600
 601 config SHARED_KERNEL
 602         bool "VM shared kernel support"
 603         depends on !JUMP_LABEL
 604         help
 605           Select this option, if you want to share the text segment of the
 606           Linux kernel between different VM guests. This reduces memory
 607           usage with lots of guests but greatly increases kernel size.
 608           Also if a kernel was IPL'ed from a shared segment the kexec system
 609           call will not work.
 610           You should only select this option if you know what you are
 611           doing and want to exploit this feature.
 612
 613 config CMM
 614         def_tristate n
 615         prompt "Cooperative memory management"
 616         help
 617           Select this option, if you want to enable the kernel interface
 618           to reduce the memory size of the system. This is accomplished
 619           by allocating pages of memory and put them "on hold". This only
 620           makes sense for a system running under VM where the unused pages
 621           will be reused by VM for other guest systems. The interface
 622           allows an external monitor to balance memory of many systems.
 623           Everybody who wants to run Linux under VM should select this
 624           option.
 625
 626 config CMM_IUCV
 627         def_bool y
 628         prompt "IUCV special message interface to cooperative memory management"
 629         depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
 630         help
 631           Select this option to enable the special message interface to
 632           the cooperative memory management.
 633
 634 config APPLDATA_BASE
 635         def_bool n
 636         prompt "Linux - VM Monitor Stream, base infrastructure"
 637         depends on PROC_FS
 638         help
 639           This provides a kernel interface for creating and updating z/VM APPLDATA
 640           monitor records. The monitor records are updated at certain time
 641           intervals, once the timer is started.
 642           Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
 643           i.e. enables or disables monitoring on the Linux side.
 644           A custom interval value (in seconds) can be written to
 645           /proc/appldata/interval.
 646
 647           Defaults are 60 seconds interval and timer off.
 648           The /proc entries can also be read from, showing the current settings.
 649
 650 config APPLDATA_MEM
 651         def_tristate m
 652         prompt "Monitor memory management statistics"
 653         depends on APPLDATA_BASE && VM_EVENT_COUNTERS
 654         help
 655           This provides memory management related data to the Linux - VM Monitor
 656           Stream, like paging/swapping rate, memory utilisation, etc.
 657           Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
 658           APPLDATA monitor record, i.e. enables or disables monitoring this record
 659           on the z/VM side.
 660
 661           Default is disabled.
 662           The /proc entry can also be read from, showing the current settings.
 663
 664           This can also be compiled as a module, which will be called
 665           appldata_mem.o.
 666
 667 config APPLDATA_OS
 668         def_tristate m
 669         prompt "Monitor OS statistics"
 670         depends on APPLDATA_BASE
 671         help
 672           This provides OS related data to the Linux - VM Monitor Stream, like
 673           CPU utilisation, etc.
 674           Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
 675           APPLDATA monitor record, i.e. enables or disables monitoring this record
 676           on the z/VM side.
 677
 678           Default is disabled.
 679           This can also be compiled as a module, which will be called
 680           appldata_os.o.
 681
 682 config APPLDATA_NET_SUM
 683         def_tristate m
 684         prompt "Monitor overall network statistics"
 685         depends on APPLDATA_BASE && NET
 686         help
 687           This provides network related data to the Linux - VM Monitor Stream,
 688           currently there is only a total sum of network I/O statistics, no
 689           per-interface data.
 690           Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
 691           APPLDATA monitor record, i.e. enables or disables monitoring this record
 692           on the z/VM side.
 693
 694           Default is disabled.
 695           This can also be compiled as a module, which will be called
 696           appldata_net_sum.o.
 697
 698 config S390_HYPFS_FS
 699         def_bool y
 700         prompt "s390 hypervisor file system support"
 701         select SYS_HYPERVISOR
 702         help
 703           This is a virtual file system intended to provide accounting
 704           information in an s390 hypervisor environment.
 705
 706 source "arch/s390/kvm/Kconfig"
 707
 708 config S390_GUEST
 709         def_bool y
 710         prompt "s390 support for virtio devices"
 711         depends on 64BIT
 712         select VIRTUALIZATION
 713         select VIRTIO
 714         select VIRTIO_CONSOLE
 715         help
 716           Enabling this option adds support for virtio based paravirtual device
 717           drivers on s390.
 718
 719           Select this option if you want to run the kernel as a guest under
 720           the KVM hypervisor.
 721
 722 endmenu