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_KERNEL_THREAD
 102         select GENERIC_SMP_IDLE_THREAD
 103         select GENERIC_TIME_VSYSCALL_OLD
 104         select HAVE_ALIGNED_STRUCT_PAGE if SLUB
 105         select HAVE_ARCH_JUMP_LABEL if !MARCH_G5
 106         select HAVE_ARCH_MUTEX_CPU_RELAX
 107         select HAVE_ARCH_SECCOMP_FILTER
 108         select HAVE_ARCH_TRACEHOOK
 109         select HAVE_ARCH_TRANSPARENT_HUGEPAGE if 64BIT
 110         select HAVE_BPF_JIT if 64BIT && PACK_STACK
 111         select HAVE_CMPXCHG_DOUBLE
 112         select HAVE_CMPXCHG_LOCAL
 113         select HAVE_C_RECORDMCOUNT
 114         select HAVE_DEBUG_KMEMLEAK
 115         select HAVE_DYNAMIC_FTRACE
 116         select HAVE_FTRACE_MCOUNT_RECORD
 117         select HAVE_FUNCTION_GRAPH_TRACER
 118         select HAVE_FUNCTION_TRACER
 119         select HAVE_FUNCTION_TRACE_MCOUNT_TEST
 120         select HAVE_KERNEL_BZIP2
 121         select HAVE_KERNEL_GZIP
 122         select HAVE_KERNEL_LZMA
 123         select HAVE_KERNEL_LZO
 124         select HAVE_KERNEL_XZ
 125         select HAVE_KPROBES
 126         select HAVE_KRETPROBES
 127         select HAVE_KVM if 64BIT
 128         select HAVE_MEMBLOCK
 129         select HAVE_MEMBLOCK_NODE_MAP
 130         select HAVE_MOD_ARCH_SPECIFIC
 131         select HAVE_OPROFILE
 132         select HAVE_PERF_EVENTS
 133         select HAVE_REGS_AND_STACK_ACCESS_API
 134         select HAVE_SYSCALL_TRACEPOINTS
 135         select HAVE_UID16 if 32BIT
 136         select HAVE_VIRT_CPU_ACCOUNTING
 137         select VIRT_TO_BUS
 138         select INIT_ALL_POSSIBLE
 139         select KTIME_SCALAR if 32BIT
 140         select MODULES_USE_ELF_RELA
 141         select OLD_SIGSUSPEND3
 142         select OLD_SIGACTION
 143         select SYSCTL_EXCEPTION_TRACE
 144         select USE_GENERIC_SMP_HELPERS if SMP
 145         select VIRT_CPU_ACCOUNTING
 146
 147 config SCHED_OMIT_FRAME_POINTER
 148         def_bool y
 149
 150 source "init/Kconfig"
 151
 152 source "kernel/Kconfig.freezer"
 153
 154 menu "Processor type and features"
 155
 156 config HAVE_MARCH_Z900_FEATURES
 157         def_bool n
 158
 159 config HAVE_MARCH_Z990_FEATURES
 160         def_bool n
 161         select HAVE_MARCH_Z900_FEATURES
 162
 163 config HAVE_MARCH_Z9_109_FEATURES
 164         def_bool n
 165         select HAVE_MARCH_Z990_FEATURES
 166
 167 config HAVE_MARCH_Z10_FEATURES
 168         def_bool n
 169         select HAVE_MARCH_Z9_109_FEATURES
 170
 171 config HAVE_MARCH_Z196_FEATURES
 172         def_bool n
 173         select HAVE_MARCH_Z10_FEATURES
 174
 175 config HAVE_MARCH_ZEC12_FEATURES
 176         def_bool n
 177         select HAVE_MARCH_Z196_FEATURES
 178
 179 choice
 180         prompt "Processor type"
 181         default MARCH_G5
 182
 183 config MARCH_G5
 184         bool "System/390 model G5 and G6"
 185         depends on !64BIT
 186         help
 187           Select this to build a 31 bit kernel that works
 188           on all ESA/390 and z/Architecture machines.
 189
 190 config MARCH_Z900
 191         bool "IBM zSeries model z800 and z900"
 192         select HAVE_MARCH_Z900_FEATURES if 64BIT
 193         help
 194           Select this to enable optimizations for model z800/z900 (2064 and
 195           2066 series). This will enable some optimizations that are not
 196           available on older ESA/390 (31 Bit) only CPUs.
 197
 198 config MARCH_Z990
 199         bool "IBM zSeries model z890 and z990"
 200         select HAVE_MARCH_Z990_FEATURES if 64BIT
 201         help
 202           Select this to enable optimizations for model z890/z990 (2084 and
 203           2086 series). The kernel will be slightly faster but will not work
 204           on older machines.
 205
 206 config MARCH_Z9_109
 207         bool "IBM System z9"
 208         select HAVE_MARCH_Z9_109_FEATURES if 64BIT
 209         help
 210           Select this to enable optimizations for IBM System z9 (2094 and
 211           2096 series). The kernel will be slightly faster but will not work
 212           on older machines.
 213
 214 config MARCH_Z10
 215         bool "IBM System z10"
 216         select HAVE_MARCH_Z10_FEATURES if 64BIT
 217         help
 218           Select this to enable optimizations for IBM System z10 (2097 and
 219           2098 series). The kernel will be slightly faster but will not work
 220           on older machines.
 221
 222 config MARCH_Z196
 223         bool "IBM zEnterprise 114 and 196"
 224         select HAVE_MARCH_Z196_FEATURES if 64BIT
 225         help
 226           Select this to enable optimizations for IBM zEnterprise 114 and 196
 227           (2818 and 2817 series). The kernel will be slightly faster but will
 228           not work on older machines.
 229
 230 config MARCH_ZEC12
 231         bool "IBM zEC12"
 232         select HAVE_MARCH_ZEC12_FEATURES if 64BIT
 233         help
 234           Select this to enable optimizations for IBM zEC12 (2827 series). The
 235           kernel will be slightly faster but will not work on older machines.
 236
 237 endchoice
 238
 239 config 64BIT
 240         def_bool y
 241         prompt "64 bit kernel"
 242         help
 243           Select this option if you have an IBM z/Architecture machine
 244           and want to use the 64 bit addressing mode.
 245
 246 config 32BIT
 247         def_bool y if !64BIT
 248
 249 config COMPAT
 250         def_bool y
 251         prompt "Kernel support for 31 bit emulation"
 252         depends on 64BIT
 253         select COMPAT_BINFMT_ELF if BINFMT_ELF
 254         select ARCH_WANT_OLD_COMPAT_IPC
 255         select COMPAT_OLD_SIGACTION
 256         help
 257           Select this option if you want to enable your system kernel to
 258           handle system-calls from ELF binaries for 31 bit ESA.  This option
 259           (and some other stuff like libraries and such) is needed for
 260           executing 31 bit applications.  It is safe to say "Y".
 261
 262 config SYSVIPC_COMPAT
 263         def_bool y if COMPAT && SYSVIPC
 264
 265 config KEYS_COMPAT
 266         def_bool y if COMPAT && KEYS
 267
 268 config SMP
 269         def_bool y
 270         prompt "Symmetric multi-processing support"
 271         ---help---
 272           This enables support for systems with more than one CPU. If you have
 273           a system with only one CPU, like most personal computers, say N. If
 274           you have a system with more than one CPU, say Y.
 275
 276           If you say N here, the kernel will run on single and multiprocessor
 277           machines, but will use only one CPU of a multiprocessor machine. If
 278           you say Y here, the kernel will run on many, but not all,
 279           singleprocessor machines. On a singleprocessor machine, the kernel
 280           will run faster if you say N here.
 281
 282           See also the SMP-HOWTO available at
 283           <http://www.tldp.org/docs.html#howto>.
 284
 285           Even if you don't know what to do here, say Y.
 286
 287 config NR_CPUS
 288         int "Maximum number of CPUs (2-64)"
 289         range 2 64
 290         depends on SMP
 291         default "32" if !64BIT
 292         default "64" if 64BIT
 293         help
 294           This allows you to specify the maximum number of CPUs which this
 295           kernel will support.  The maximum supported value is 64 and the
 296           minimum value which makes sense is 2.
 297
 298           This is purely to save memory - each supported CPU adds
 299           approximately sixteen kilobytes to the kernel image.
 300
 301 config HOTPLUG_CPU
 302         def_bool y
 303         prompt "Support for hot-pluggable CPUs"
 304         depends on SMP
 305         select HOTPLUG
 306         help
 307           Say Y here to be able to turn CPUs off and on. CPUs
 308           can be controlled through /sys/devices/system/cpu/cpu#.
 309           Say N if you want to disable CPU hotplug.
 310
 311 config SCHED_MC
 312         def_bool n
 313
 314 config SCHED_BOOK
 315         def_bool y
 316         prompt "Book scheduler support"
 317         depends on SMP
 318         select SCHED_MC
 319         help
 320           Book scheduler support improves the CPU scheduler's decision making
 321           when dealing with machines that have several books.
 322
 323 source kernel/Kconfig.preempt
 324
 325 config MATHEMU
 326         def_bool y
 327         prompt "IEEE FPU emulation"
 328         depends on MARCH_G5
 329         help
 330           This option is required for IEEE compliant floating point arithmetic
 331           on older ESA/390 machines. Say Y unless you know your machine doesn't
 332           need this.
 333
 334 source kernel/Kconfig.hz
 335
 336 endmenu
 337
 338 menu "Memory setup"
 339
 340 config ARCH_SPARSEMEM_ENABLE
 341         def_bool y
 342         select SPARSEMEM_VMEMMAP_ENABLE
 343         select SPARSEMEM_VMEMMAP
 344         select SPARSEMEM_STATIC if !64BIT
 345
 346 config ARCH_SPARSEMEM_DEFAULT
 347         def_bool y
 348
 349 config ARCH_SELECT_MEMORY_MODEL
 350         def_bool y
 351
 352 config ARCH_ENABLE_MEMORY_HOTPLUG
 353         def_bool y if SPARSEMEM
 354
 355 config ARCH_ENABLE_MEMORY_HOTREMOVE
 356         def_bool y
 357
 358 config FORCE_MAX_ZONEORDER
 359         int
 360         default "9"
 361
 362 source "mm/Kconfig"
 363
 364 config PACK_STACK
 365         def_bool y
 366         prompt "Pack kernel stack"
 367         help
 368           This option enables the compiler option -mkernel-backchain if it
 369           is available. If the option is available the compiler supports
 370           the new stack layout which dramatically reduces the minimum stack
 371           frame size. With an old compiler a non-leaf function needs a
 372           minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
 373           -mkernel-backchain the minimum size drops to 16 byte on 31 bit
 374           and 24 byte on 64 bit.
 375
 376           Say Y if you are unsure.
 377
 378 config CHECK_STACK
 379         def_bool y
 380         prompt "Detect kernel stack overflow"
 381         help
 382           This option enables the compiler option -mstack-guard and
 383           -mstack-size if they are available. If the compiler supports them
 384           it will emit additional code to each function prolog to trigger
 385           an illegal operation if the kernel stack is about to overflow.
 386
 387           Say N if you are unsure.
 388
 389 config STACK_GUARD
 390         int "Size of the guard area (128-1024)"
 391         range 128 1024
 392         depends on CHECK_STACK
 393         default "256"
 394         help
 395           This allows you to specify the size of the guard area at the lower
 396           end of the kernel stack. If the kernel stack points into the guard
 397           area on function entry an illegal operation is triggered. The size
 398           needs to be a power of 2. Please keep in mind that the size of an
 399           interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
 400           The minimum size for the stack guard should be 256 for 31 bit and
 401           512 for 64 bit.
 402
 403 config WARN_DYNAMIC_STACK
 404         def_bool n
 405         prompt "Emit compiler warnings for function with dynamic stack usage"
 406         help
 407           This option enables the compiler option -mwarn-dynamicstack. If the
 408           compiler supports this options generates warnings for functions
 409           that dynamically allocate stack space using alloca.
 410
 411           Say N if you are unsure.
 412
 413 endmenu
 414
 415 menu "I/O subsystem"
 416
 417 config QDIO
 418         def_tristate y
 419         prompt "QDIO support"
 420         ---help---
 421           This driver provides the Queued Direct I/O base support for
 422           IBM System z.
 423
 424           To compile this driver as a module, choose M here: the
 425           module will be called qdio.
 426
 427           If unsure, say Y.
 428
 429 menuconfig PCI
 430         bool "PCI support"
 431         default n
 432         depends on 64BIT
 433         select ARCH_SUPPORTS_MSI
 434         select PCI_MSI
 435         help
 436           Enable PCI support.
 437
 438 if PCI
 439
 440 config PCI_NR_FUNCTIONS
 441         int "Maximum number of PCI functions (1-4096)"
 442         range 1 4096
 443         default "64"
 444         help
 445           This allows you to specify the maximum number of PCI functions which
 446           this kernel will support.
 447
 448 source "drivers/pci/Kconfig"
 449 source "drivers/pci/pcie/Kconfig"
 450 source "drivers/pci/hotplug/Kconfig"
 451
 452 endif   # PCI
 453
 454 config PCI_DOMAINS
 455         def_bool PCI
 456
 457 config HAS_IOMEM
 458         def_bool PCI
 459
 460 config IOMMU_HELPER
 461         def_bool PCI
 462
 463 config HAS_DMA
 464         def_bool PCI
 465         select HAVE_DMA_API_DEBUG
 466
 467 config NEED_SG_DMA_LENGTH
 468         def_bool PCI
 469
 470 config HAVE_DMA_ATTRS
 471         def_bool PCI
 472
 473 config NEED_DMA_MAP_STATE
 474         def_bool PCI
 475
 476 config CHSC_SCH
 477         def_tristate m
 478         prompt "Support for CHSC subchannels"
 479         help
 480           This driver allows usage of CHSC subchannels. A CHSC subchannel
 481           is usually present on LPAR only.
 482           The driver creates a device /dev/chsc, which may be used to
 483           obtain I/O configuration information about the machine and
 484           to issue asynchronous chsc commands (DANGEROUS).
 485           You will usually only want to use this interface on a special
 486           LPAR designated for system management.
 487
 488           To compile this driver as a module, choose M here: the
 489           module will be called chsc_sch.
 490
 491           If unsure, say N.
 492
 493 config SCM_BUS
 494         def_bool y
 495         depends on 64BIT
 496         prompt "SCM bus driver"
 497         help
 498           Bus driver for Storage Class Memory.
 499
 500 config EADM_SCH
 501         def_tristate m
 502         prompt "Support for EADM subchannels"
 503         depends on SCM_BUS
 504         help
 505           This driver allows usage of EADM subchannels. EADM subchannels act
 506           as a communication vehicle for SCM increments.
 507
 508           To compile this driver as a module, choose M here: the
 509           module will be called eadm_sch.
 510
 511 endmenu
 512
 513 menu "Dump support"
 514
 515 config CRASH_DUMP
 516         bool "kernel crash dumps"
 517         depends on 64BIT && SMP
 518         select KEXEC
 519         help
 520           Generate crash dump after being started by kexec.
 521           Crash dump kernels are loaded in the main kernel with kexec-tools
 522           into a specially reserved region and then later executed after
 523           a crash by kdump/kexec.
 524           For more details see Documentation/kdump/kdump.txt
 525
 526 config ZFCPDUMP
 527         def_bool n
 528         prompt "zfcpdump support"
 529         select SMP
 530         help
 531           Select this option if you want to build an zfcpdump enabled kernel.
 532           Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this.
 533
 534 endmenu
 535
 536 menu "Executable file formats / Emulations"
 537
 538 source "fs/Kconfig.binfmt"
 539
 540 config SECCOMP
 541         def_bool y
 542         prompt "Enable seccomp to safely compute untrusted bytecode"
 543         depends on PROC_FS
 544         help
 545           This kernel feature is useful for number crunching applications
 546           that may need to compute untrusted bytecode during their
 547           execution. By using pipes or other transports made available to
 548           the process as file descriptors supporting the read/write
 549           syscalls, it's possible to isolate those applications in
 550           their own address space using seccomp. Once seccomp is
 551           enabled via /proc/<pid>/seccomp, it cannot be disabled
 552           and the task is only allowed to execute a few safe syscalls
 553           defined by each seccomp mode.
 554
 555           If unsure, say Y.
 556
 557 endmenu
 558
 559 menu "Power Management"
 560
 561 config ARCH_HIBERNATION_POSSIBLE
 562         def_bool y if 64BIT
 563
 564 source "kernel/power/Kconfig"
 565
 566 endmenu
 567
 568 source "net/Kconfig"
 569
 570 config PCMCIA
 571         def_bool n
 572
 573 config CCW
 574         def_bool y
 575
 576 source "drivers/Kconfig"
 577
 578 source "fs/Kconfig"
 579
 580 source "arch/s390/Kconfig.debug"
 581
 582 source "security/Kconfig"
 583
 584 source "crypto/Kconfig"
 585
 586 source "lib/Kconfig"
 587
 588 menu "Virtualization"
 589
 590 config PFAULT
 591         def_bool y
 592         prompt "Pseudo page fault support"
 593         help
 594           Select this option, if you want to use PFAULT pseudo page fault
 595           handling under VM. If running native or in LPAR, this option
 596           has no effect. If your VM does not support PFAULT, PAGEEX
 597           pseudo page fault handling will be used.
 598           Note that VM 4.2 supports PFAULT but has a bug in its
 599           implementation that causes some problems.
 600           Everybody who wants to run Linux under VM != VM4.2 should select
 601           this option.
 602
 603 config SHARED_KERNEL
 604         bool "VM shared kernel support"
 605         depends on !JUMP_LABEL
 606         help
 607           Select this option, if you want to share the text segment of the
 608           Linux kernel between different VM guests. This reduces memory
 609           usage with lots of guests but greatly increases kernel size.
 610           Also if a kernel was IPL'ed from a shared segment the kexec system
 611           call will not work.
 612           You should only select this option if you know what you are
 613           doing and want to exploit this feature.
 614
 615 config CMM
 616         def_tristate n
 617         prompt "Cooperative memory management"
 618         help
 619           Select this option, if you want to enable the kernel interface
 620           to reduce the memory size of the system. This is accomplished
 621           by allocating pages of memory and put them "on hold". This only
 622           makes sense for a system running under VM where the unused pages
 623           will be reused by VM for other guest systems. The interface
 624           allows an external monitor to balance memory of many systems.
 625           Everybody who wants to run Linux under VM should select this
 626           option.
 627
 628 config CMM_IUCV
 629         def_bool y
 630         prompt "IUCV special message interface to cooperative memory management"
 631         depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
 632         help
 633           Select this option to enable the special message interface to
 634           the cooperative memory management.
 635
 636 config APPLDATA_BASE
 637         def_bool n
 638         prompt "Linux - VM Monitor Stream, base infrastructure"
 639         depends on PROC_FS
 640         help
 641           This provides a kernel interface for creating and updating z/VM APPLDATA
 642           monitor records. The monitor records are updated at certain time
 643           intervals, once the timer is started.
 644           Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
 645           i.e. enables or disables monitoring on the Linux side.
 646           A custom interval value (in seconds) can be written to
 647           /proc/appldata/interval.
 648
 649           Defaults are 60 seconds interval and timer off.
 650           The /proc entries can also be read from, showing the current settings.
 651
 652 config APPLDATA_MEM
 653         def_tristate m
 654         prompt "Monitor memory management statistics"
 655         depends on APPLDATA_BASE && VM_EVENT_COUNTERS
 656         help
 657           This provides memory management related data to the Linux - VM Monitor
 658           Stream, like paging/swapping rate, memory utilisation, etc.
 659           Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
 660           APPLDATA monitor record, i.e. enables or disables monitoring this record
 661           on the z/VM side.
 662
 663           Default is disabled.
 664           The /proc entry can also be read from, showing the current settings.
 665
 666           This can also be compiled as a module, which will be called
 667           appldata_mem.o.
 668
 669 config APPLDATA_OS
 670         def_tristate m
 671         prompt "Monitor OS statistics"
 672         depends on APPLDATA_BASE
 673         help
 674           This provides OS related data to the Linux - VM Monitor Stream, like
 675           CPU utilisation, etc.
 676           Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
 677           APPLDATA monitor record, i.e. enables or disables monitoring this record
 678           on the z/VM side.
 679
 680           Default is disabled.
 681           This can also be compiled as a module, which will be called
 682           appldata_os.o.
 683
 684 config APPLDATA_NET_SUM
 685         def_tristate m
 686         prompt "Monitor overall network statistics"
 687         depends on APPLDATA_BASE && NET
 688         help
 689           This provides network related data to the Linux - VM Monitor Stream,
 690           currently there is only a total sum of network I/O statistics, no
 691           per-interface data.
 692           Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
 693           APPLDATA monitor record, i.e. enables or disables monitoring this record
 694           on the z/VM side.
 695
 696           Default is disabled.
 697           This can also be compiled as a module, which will be called
 698           appldata_net_sum.o.
 699
 700 config S390_HYPFS_FS
 701         def_bool y
 702         prompt "s390 hypervisor file system support"
 703         select SYS_HYPERVISOR
 704         help
 705           This is a virtual file system intended to provide accounting
 706           information in an s390 hypervisor environment.
 707
 708 source "arch/s390/kvm/Kconfig"
 709
 710 config S390_GUEST
 711         def_bool y
 712         prompt "s390 support for virtio devices"
 713         depends on 64BIT
 714         select VIRTUALIZATION
 715         select VIRTIO
 716         select VIRTIO_CONSOLE
 717         help
 718           Enabling this option adds support for virtio based paravirtual device
 719           drivers on s390.
 720
 721           Select this option if you want to run the kernel as a guest under
 722           the KVM hypervisor.
 723
 724 endmenu