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_MAP
  56         def_bool y
  57
  58 config PCI_QUIRKS
  59         def_bool n
  60
  61 config ARCH_SUPPORTS_UPROBES
  62         def_bool 64BIT
  63
  64 config S390
  65         def_bool y
  66         select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
  67         select ARCH_HAS_DEBUG_STRICT_USER_COPY_CHECKS
  68         select ARCH_HAVE_NMI_SAFE_CMPXCHG
  69         select ARCH_INLINE_READ_LOCK
  70         select ARCH_INLINE_READ_LOCK_BH
  71         select ARCH_INLINE_READ_LOCK_IRQ
  72         select ARCH_INLINE_READ_LOCK_IRQSAVE
  73         select ARCH_INLINE_READ_TRYLOCK
  74         select ARCH_INLINE_READ_UNLOCK
  75         select ARCH_INLINE_READ_UNLOCK_BH
  76         select ARCH_INLINE_READ_UNLOCK_IRQ
  77         select ARCH_INLINE_READ_UNLOCK_IRQRESTORE
  78         select ARCH_INLINE_SPIN_LOCK
  79         select ARCH_INLINE_SPIN_LOCK_BH
  80         select ARCH_INLINE_SPIN_LOCK_IRQ
  81         select ARCH_INLINE_SPIN_LOCK_IRQSAVE
  82         select ARCH_INLINE_SPIN_TRYLOCK
  83         select ARCH_INLINE_SPIN_TRYLOCK_BH
  84         select ARCH_INLINE_SPIN_UNLOCK
  85         select ARCH_INLINE_SPIN_UNLOCK_BH
  86         select ARCH_INLINE_SPIN_UNLOCK_IRQ
  87         select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE
  88         select ARCH_INLINE_WRITE_LOCK
  89         select ARCH_INLINE_WRITE_LOCK_BH
  90         select ARCH_INLINE_WRITE_LOCK_IRQ
  91         select ARCH_INLINE_WRITE_LOCK_IRQSAVE
  92         select ARCH_INLINE_WRITE_TRYLOCK
  93         select ARCH_INLINE_WRITE_UNLOCK
  94         select ARCH_INLINE_WRITE_UNLOCK_BH
  95         select ARCH_INLINE_WRITE_UNLOCK_IRQ
  96         select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE
  97         select ARCH_SAVE_PAGE_KEYS if HIBERNATION
  98         select ARCH_SUPPORTS_ATOMIC_RMW
  99         select ARCH_USE_CMPXCHG_LOCKREF
 100         select ARCH_WANT_IPC_PARSE_VERSION
 101         select BUILDTIME_EXTABLE_SORT
 102         select CLONE_BACKWARDS2
 103         select DYNAMIC_FTRACE if FUNCTION_TRACER
 104         select GENERIC_CLOCKEVENTS
 105         select GENERIC_CPU_DEVICES if !SMP
 106         select GENERIC_FIND_FIRST_BIT
 107         select GENERIC_SMP_IDLE_THREAD
 108         select GENERIC_TIME_VSYSCALL
 109         select HAVE_ALIGNED_STRUCT_PAGE if SLUB
 110         select HAVE_ARCH_AUDITSYSCALL
 111         select HAVE_ARCH_JUMP_LABEL if !MARCH_G5
 112         select HAVE_ARCH_SECCOMP_FILTER
 113         select HAVE_ARCH_TRACEHOOK
 114         select HAVE_ARCH_TRANSPARENT_HUGEPAGE if 64BIT
 115         select HAVE_BPF_JIT if 64BIT && PACK_STACK
 116         select HAVE_CMPXCHG_DOUBLE
 117         select HAVE_CMPXCHG_LOCAL
 118         select HAVE_C_RECORDMCOUNT
 119         select HAVE_DEBUG_KMEMLEAK
 120         select HAVE_DYNAMIC_FTRACE if 64BIT
 121         select HAVE_DYNAMIC_FTRACE_WITH_REGS if 64BIT
 122         select HAVE_FTRACE_MCOUNT_RECORD
 123         select HAVE_FUNCTION_GRAPH_TRACER if 64BIT
 124         select HAVE_FUNCTION_TRACER if 64BIT
 125         select HAVE_FUTEX_CMPXCHG if FUTEX
 126         select HAVE_KERNEL_BZIP2
 127         select HAVE_KERNEL_GZIP
 128         select HAVE_KERNEL_LZ4
 129         select HAVE_KERNEL_LZMA
 130         select HAVE_KERNEL_LZO
 131         select HAVE_KERNEL_XZ
 132         select HAVE_KPROBES
 133         select HAVE_KRETPROBES
 134         select HAVE_KVM if 64BIT
 135         select HAVE_MEMBLOCK
 136         select HAVE_MEMBLOCK_NODE_MAP
 137         select HAVE_MEMBLOCK_PHYS_MAP
 138         select HAVE_MOD_ARCH_SPECIFIC
 139         select HAVE_OPROFILE
 140         select HAVE_PERF_EVENTS
 141         select HAVE_REGS_AND_STACK_ACCESS_API
 142         select HAVE_SYSCALL_TRACEPOINTS
 143         select HAVE_UID16 if 32BIT
 144         select HAVE_VIRT_CPU_ACCOUNTING
 145         select MODULES_USE_ELF_RELA
 146         select NO_BOOTMEM
 147         select OLD_SIGACTION
 148         select OLD_SIGSUSPEND3
 149         select SYSCTL_EXCEPTION_TRACE
 150         select TTY
 151         select VIRT_CPU_ACCOUNTING
 152         select VIRT_TO_BUS
 153         select ARCH_HAS_SG_CHAIN
 154
 155 config SCHED_OMIT_FRAME_POINTER
 156         def_bool y
 157
 158 source "init/Kconfig"
 159
 160 source "kernel/Kconfig.freezer"
 161
 162 menu "Processor type and features"
 163
 164 config HAVE_MARCH_Z900_FEATURES
 165         def_bool n
 166
 167 config HAVE_MARCH_Z990_FEATURES
 168         def_bool n
 169         select HAVE_MARCH_Z900_FEATURES
 170
 171 config HAVE_MARCH_Z9_109_FEATURES
 172         def_bool n
 173         select HAVE_MARCH_Z990_FEATURES
 174
 175 config HAVE_MARCH_Z10_FEATURES
 176         def_bool n
 177         select HAVE_MARCH_Z9_109_FEATURES
 178
 179 config HAVE_MARCH_Z196_FEATURES
 180         def_bool n
 181         select HAVE_MARCH_Z10_FEATURES
 182
 183 config HAVE_MARCH_ZEC12_FEATURES
 184         def_bool n
 185         select HAVE_MARCH_Z196_FEATURES
 186
 187 choice
 188         prompt "Processor type"
 189         default MARCH_G5
 190
 191 config MARCH_G5
 192         bool "System/390 model G5 and G6"
 193         depends on !64BIT
 194         help
 195           Select this to build a 31 bit kernel that works
 196           on all ESA/390 and z/Architecture machines.
 197
 198 config MARCH_Z900
 199         bool "IBM zSeries model z800 and z900"
 200         select HAVE_MARCH_Z900_FEATURES if 64BIT
 201         help
 202           Select this to enable optimizations for model z800/z900 (2064 and
 203           2066 series). This will enable some optimizations that are not
 204           available on older ESA/390 (31 Bit) only CPUs.
 205
 206 config MARCH_Z990
 207         bool "IBM zSeries model z890 and z990"
 208         select HAVE_MARCH_Z990_FEATURES if 64BIT
 209         help
 210           Select this to enable optimizations for model z890/z990 (2084 and
 211           2086 series). The kernel will be slightly faster but will not work
 212           on older machines.
 213
 214 config MARCH_Z9_109
 215         bool "IBM System z9"
 216         select HAVE_MARCH_Z9_109_FEATURES if 64BIT
 217         help
 218           Select this to enable optimizations for IBM System z9 (2094 and
 219           2096 series). The kernel will be slightly faster but will not work
 220           on older machines.
 221
 222 config MARCH_Z10
 223         bool "IBM System z10"
 224         select HAVE_MARCH_Z10_FEATURES if 64BIT
 225         help
 226           Select this to enable optimizations for IBM System z10 (2097 and
 227           2098 series). The kernel will be slightly faster but will not work
 228           on older machines.
 229
 230 config MARCH_Z196
 231         bool "IBM zEnterprise 114 and 196"
 232         select HAVE_MARCH_Z196_FEATURES if 64BIT
 233         help
 234           Select this to enable optimizations for IBM zEnterprise 114 and 196
 235           (2818 and 2817 series). The kernel will be slightly faster but will
 236           not work on older machines.
 237
 238 config MARCH_ZEC12
 239         bool "IBM zBC12 and zEC12"
 240         select HAVE_MARCH_ZEC12_FEATURES if 64BIT
 241         help
 242           Select this to enable optimizations for IBM zBC12 and zEC12 (2828 and
 243           2827 series). The kernel will be slightly faster but will not work on
 244           older machines.
 245
 246 endchoice
 247
 248 config MARCH_G5_TUNE
 249         def_bool TUNE_G5 || MARCH_G5 && TUNE_DEFAULT
 250
 251 config MARCH_Z900_TUNE
 252         def_bool TUNE_Z900 || MARCH_Z900 && TUNE_DEFAULT
 253
 254 config MARCH_Z990_TUNE
 255         def_bool TUNE_Z990 || MARCH_Z990 && TUNE_DEFAULT
 256
 257 config MARCH_Z9_109_TUNE
 258         def_bool TUNE_Z9_109 || MARCH_Z9_109 && TUNE_DEFAULT
 259
 260 config MARCH_Z10_TUNE
 261         def_bool TUNE_Z10 || MARCH_Z10 && TUNE_DEFAULT
 262
 263 config MARCH_Z196_TUNE
 264         def_bool TUNE_Z196 || MARCH_Z196 && TUNE_DEFAULT
 265
 266 config MARCH_ZEC12_TUNE
 267         def_bool TUNE_ZEC12 || MARCH_ZEC12 && TUNE_DEFAULT
 268
 269 choice
 270         prompt "Tune code generation"
 271         default TUNE_DEFAULT
 272         help
 273           Cause the compiler to tune (-mtune) the generated code for a machine.
 274           This will make the code run faster on the selected machine but
 275           somewhat slower on other machines.
 276           This option only changes how the compiler emits instructions, not the
 277           selection of instructions itself, so the resulting kernel will run on
 278           all other machines.
 279
 280 config TUNE_DEFAULT
 281         bool "Default"
 282         help
 283           Tune the generated code for the target processor for which the kernel
 284           will be compiled.
 285
 286 config TUNE_G5
 287         bool "System/390 model G5 and G6"
 288
 289 config TUNE_Z900
 290         bool "IBM zSeries model z800 and z900"
 291
 292 config TUNE_Z990
 293         bool "IBM zSeries model z890 and z990"
 294
 295 config TUNE_Z9_109
 296         bool "IBM System z9"
 297
 298 config TUNE_Z10
 299         bool "IBM System z10"
 300
 301 config TUNE_Z196
 302         bool "IBM zEnterprise 114 and 196"
 303
 304 config TUNE_ZEC12
 305         bool "IBM zBC12 and zEC12"
 306
 307 endchoice
 308
 309 config 64BIT
 310         def_bool y
 311         prompt "64 bit kernel"
 312         help
 313           Select this option if you have an IBM z/Architecture machine
 314           and want to use the 64 bit addressing mode.
 315
 316 config 32BIT
 317         def_bool y if !64BIT
 318
 319 config COMPAT
 320         def_bool y
 321         prompt "Kernel support for 31 bit emulation"
 322         depends on 64BIT
 323         select COMPAT_BINFMT_ELF if BINFMT_ELF
 324         select ARCH_WANT_OLD_COMPAT_IPC
 325         select COMPAT_OLD_SIGACTION
 326         help
 327           Select this option if you want to enable your system kernel to
 328           handle system-calls from ELF binaries for 31 bit ESA.  This option
 329           (and some other stuff like libraries and such) is needed for
 330           executing 31 bit applications.  It is safe to say "Y".
 331
 332 config SYSVIPC_COMPAT
 333         def_bool y if COMPAT && SYSVIPC
 334
 335 config KEYS_COMPAT
 336         def_bool y if COMPAT && KEYS
 337
 338 config SMP
 339         def_bool y
 340         prompt "Symmetric multi-processing support"
 341         ---help---
 342           This enables support for systems with more than one CPU. If you have
 343           a system with only one CPU, like most personal computers, say N. If
 344           you have a system with more than one CPU, say Y.
 345
 346           If you say N here, the kernel will run on uni- and multiprocessor
 347           machines, but will use only one CPU of a multiprocessor machine. If
 348           you say Y here, the kernel will run on many, but not all,
 349           uniprocessor machines. On a uniprocessor machine, the kernel
 350           will run faster if you say N here.
 351
 352           See also the SMP-HOWTO available at
 353           <http://www.tldp.org/docs.html#howto>.
 354
 355           Even if you don't know what to do here, say Y.
 356
 357 config NR_CPUS
 358         int "Maximum number of CPUs (2-256)"
 359         range 2 256
 360         depends on SMP
 361         default "32" if !64BIT
 362         default "64" if 64BIT
 363         help
 364           This allows you to specify the maximum number of CPUs which this
 365           kernel will support. The maximum supported value is 256 and the
 366           minimum value which makes sense is 2.
 367
 368           This is purely to save memory - each supported CPU adds
 369           approximately sixteen kilobytes to the kernel image.
 370
 371 config HOTPLUG_CPU
 372         def_bool y
 373         prompt "Support for hot-pluggable CPUs"
 374         depends on SMP
 375         help
 376           Say Y here to be able to turn CPUs off and on. CPUs
 377           can be controlled through /sys/devices/system/cpu/cpu#.
 378           Say N if you want to disable CPU hotplug.
 379
 380 config SCHED_MC
 381         def_bool n
 382
 383 config SCHED_BOOK
 384         def_bool y
 385         prompt "Book scheduler support"
 386         depends on SMP
 387         select SCHED_MC
 388         help
 389           Book scheduler support improves the CPU scheduler's decision making
 390           when dealing with machines that have several books.
 391
 392 source kernel/Kconfig.preempt
 393
 394 config MATHEMU
 395         def_bool y
 396         prompt "IEEE FPU emulation"
 397         depends on MARCH_G5
 398         help
 399           This option is required for IEEE compliant floating point arithmetic
 400           on older ESA/390 machines. Say Y unless you know your machine doesn't
 401           need this.
 402
 403 source kernel/Kconfig.hz
 404
 405 endmenu
 406
 407 menu "Memory setup"
 408
 409 config ARCH_SPARSEMEM_ENABLE
 410         def_bool y
 411         select SPARSEMEM_VMEMMAP_ENABLE
 412         select SPARSEMEM_VMEMMAP
 413         select SPARSEMEM_STATIC if !64BIT
 414
 415 config ARCH_SPARSEMEM_DEFAULT
 416         def_bool y
 417
 418 config ARCH_SELECT_MEMORY_MODEL
 419         def_bool y
 420
 421 config ARCH_ENABLE_MEMORY_HOTPLUG
 422         def_bool y if SPARSEMEM
 423
 424 config ARCH_ENABLE_MEMORY_HOTREMOVE
 425         def_bool y
 426
 427 config ARCH_ENABLE_SPLIT_PMD_PTLOCK
 428         def_bool y
 429         depends on 64BIT
 430
 431 config FORCE_MAX_ZONEORDER
 432         int
 433         default "9"
 434
 435 source "mm/Kconfig"
 436
 437 config PACK_STACK
 438         def_bool y
 439         prompt "Pack kernel stack"
 440         help
 441           This option enables the compiler option -mkernel-backchain if it
 442           is available. If the option is available the compiler supports
 443           the new stack layout which dramatically reduces the minimum stack
 444           frame size. With an old compiler a non-leaf function needs a
 445           minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
 446           -mkernel-backchain the minimum size drops to 16 byte on 31 bit
 447           and 24 byte on 64 bit.
 448
 449           Say Y if you are unsure.
 450
 451 config CHECK_STACK
 452         def_bool y
 453         prompt "Detect kernel stack overflow"
 454         help
 455           This option enables the compiler option -mstack-guard and
 456           -mstack-size if they are available. If the compiler supports them
 457           it will emit additional code to each function prolog to trigger
 458           an illegal operation if the kernel stack is about to overflow.
 459
 460           Say N if you are unsure.
 461
 462 config STACK_GUARD
 463         int "Size of the guard area (128-1024)"
 464         range 128 1024
 465         depends on CHECK_STACK
 466         default "256"
 467         help
 468           This allows you to specify the size of the guard area at the lower
 469           end of the kernel stack. If the kernel stack points into the guard
 470           area on function entry an illegal operation is triggered. The size
 471           needs to be a power of 2. Please keep in mind that the size of an
 472           interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
 473           The minimum size for the stack guard should be 256 for 31 bit and
 474           512 for 64 bit.
 475
 476 config WARN_DYNAMIC_STACK
 477         def_bool n
 478         prompt "Emit compiler warnings for function with dynamic stack usage"
 479         help
 480           This option enables the compiler option -mwarn-dynamicstack. If the
 481           compiler supports this options generates warnings for functions
 482           that dynamically allocate stack space using alloca.
 483
 484           Say N if you are unsure.
 485
 486 endmenu
 487
 488 menu "I/O subsystem"
 489
 490 config QDIO
 491         def_tristate y
 492         prompt "QDIO support"
 493         ---help---
 494           This driver provides the Queued Direct I/O base support for
 495           IBM System z.
 496
 497           To compile this driver as a module, choose M here: the
 498           module will be called qdio.
 499
 500           If unsure, say Y.
 501
 502 menuconfig PCI
 503         bool "PCI support"
 504         depends on 64BIT
 505         select HAVE_DMA_ATTRS
 506         select PCI_MSI
 507         help
 508           Enable PCI support.
 509
 510 if PCI
 511
 512 config PCI_NR_FUNCTIONS
 513         int "Maximum number of PCI functions (1-4096)"
 514         range 1 4096
 515         default "64"
 516         help
 517           This allows you to specify the maximum number of PCI functions which
 518           this kernel will support.
 519
 520 config PCI_NR_MSI
 521         int "Maximum number of MSI interrupts (64-32768)"
 522         range 64 32768
 523         default "256"
 524         help
 525           This defines the number of virtual interrupts the kernel will
 526           provide for MSI interrupts. If you configure your system to have
 527           too few drivers will fail to allocate MSI interrupts for all
 528           PCI devices.
 529
 530 source "drivers/pci/Kconfig"
 531 source "drivers/pci/pcie/Kconfig"
 532 source "drivers/pci/hotplug/Kconfig"
 533
 534 endif   # PCI
 535
 536 config PCI_DOMAINS
 537         def_bool PCI
 538
 539 config HAS_IOMEM
 540         def_bool PCI
 541
 542 config IOMMU_HELPER
 543         def_bool PCI
 544
 545 config HAS_DMA
 546         def_bool PCI
 547         select HAVE_DMA_API_DEBUG
 548
 549 config NEED_SG_DMA_LENGTH
 550         def_bool PCI
 551
 552 config NEED_DMA_MAP_STATE
 553         def_bool PCI
 554
 555 config CHSC_SCH
 556         def_tristate m
 557         prompt "Support for CHSC subchannels"
 558         help
 559           This driver allows usage of CHSC subchannels. A CHSC subchannel
 560           is usually present on LPAR only.
 561           The driver creates a device /dev/chsc, which may be used to
 562           obtain I/O configuration information about the machine and
 563           to issue asynchronous chsc commands (DANGEROUS).
 564           You will usually only want to use this interface on a special
 565           LPAR designated for system management.
 566
 567           To compile this driver as a module, choose M here: the
 568           module will be called chsc_sch.
 569
 570           If unsure, say N.
 571
 572 config SCM_BUS
 573         def_bool y
 574         depends on 64BIT
 575         prompt "SCM bus driver"
 576         help
 577           Bus driver for Storage Class Memory.
 578
 579 config EADM_SCH
 580         def_tristate m
 581         prompt "Support for EADM subchannels"
 582         depends on SCM_BUS
 583         help
 584           This driver allows usage of EADM subchannels. EADM subchannels act
 585           as a communication vehicle for SCM increments.
 586
 587           To compile this driver as a module, choose M here: the
 588           module will be called eadm_sch.
 589
 590 endmenu
 591
 592 menu "Dump support"
 593
 594 config CRASH_DUMP
 595         bool "kernel crash dumps"
 596         depends on 64BIT && SMP
 597         select KEXEC
 598         help
 599           Generate crash dump after being started by kexec.
 600           Crash dump kernels are loaded in the main kernel with kexec-tools
 601           into a specially reserved region and then later executed after
 602           a crash by kdump/kexec.
 603           Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this.
 604           This option also enables s390 zfcpdump.
 605           See also <file:Documentation/s390/zfcpdump.txt>
 606
 607 endmenu
 608
 609 menu "Executable file formats / Emulations"
 610
 611 source "fs/Kconfig.binfmt"
 612
 613 config SECCOMP
 614         def_bool y
 615         prompt "Enable seccomp to safely compute untrusted bytecode"
 616         depends on PROC_FS
 617         help
 618           This kernel feature is useful for number crunching applications
 619           that may need to compute untrusted bytecode during their
 620           execution. By using pipes or other transports made available to
 621           the process as file descriptors supporting the read/write
 622           syscalls, it's possible to isolate those applications in
 623           their own address space using seccomp. Once seccomp is
 624           enabled via /proc/<pid>/seccomp, it cannot be disabled
 625           and the task is only allowed to execute a few safe syscalls
 626           defined by each seccomp mode.
 627
 628           If unsure, say Y.
 629
 630 endmenu
 631
 632 menu "Power Management"
 633
 634 config ARCH_HIBERNATION_POSSIBLE
 635         def_bool y if 64BIT
 636
 637 source "kernel/power/Kconfig"
 638
 639 endmenu
 640
 641 source "net/Kconfig"
 642
 643 config PCMCIA
 644         def_bool n
 645
 646 config CCW
 647         def_bool y
 648
 649 source "drivers/Kconfig"
 650
 651 source "fs/Kconfig"
 652
 653 source "arch/s390/Kconfig.debug"
 654
 655 source "security/Kconfig"
 656
 657 source "crypto/Kconfig"
 658
 659 source "lib/Kconfig"
 660
 661 menu "Virtualization"
 662
 663 config PFAULT
 664         def_bool y
 665         prompt "Pseudo page fault support"
 666         help
 667           Select this option, if you want to use PFAULT pseudo page fault
 668           handling under VM. If running native or in LPAR, this option
 669           has no effect. If your VM does not support PFAULT, PAGEEX
 670           pseudo page fault handling will be used.
 671           Note that VM 4.2 supports PFAULT but has a bug in its
 672           implementation that causes some problems.
 673           Everybody who wants to run Linux under VM != VM4.2 should select
 674           this option.
 675
 676 config SHARED_KERNEL
 677         bool "VM shared kernel support"
 678         depends on !JUMP_LABEL
 679         help
 680           Select this option, if you want to share the text segment of the
 681           Linux kernel between different VM guests. This reduces memory
 682           usage with lots of guests but greatly increases kernel size.
 683           Also if a kernel was IPL'ed from a shared segment the kexec system
 684           call will not work.
 685           You should only select this option if you know what you are
 686           doing and want to exploit this feature.
 687
 688 config CMM
 689         def_tristate n
 690         prompt "Cooperative memory management"
 691         help
 692           Select this option, if you want to enable the kernel interface
 693           to reduce the memory size of the system. This is accomplished
 694           by allocating pages of memory and put them "on hold". This only
 695           makes sense for a system running under VM where the unused pages
 696           will be reused by VM for other guest systems. The interface
 697           allows an external monitor to balance memory of many systems.
 698           Everybody who wants to run Linux under VM should select this
 699           option.
 700
 701 config CMM_IUCV
 702         def_bool y
 703         prompt "IUCV special message interface to cooperative memory management"
 704         depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
 705         help
 706           Select this option to enable the special message interface to
 707           the cooperative memory management.
 708
 709 config APPLDATA_BASE
 710         def_bool n
 711         prompt "Linux - VM Monitor Stream, base infrastructure"
 712         depends on PROC_FS
 713         help
 714           This provides a kernel interface for creating and updating z/VM APPLDATA
 715           monitor records. The monitor records are updated at certain time
 716           intervals, once the timer is started.
 717           Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
 718           i.e. enables or disables monitoring on the Linux side.
 719           A custom interval value (in seconds) can be written to
 720           /proc/appldata/interval.
 721
 722           Defaults are 60 seconds interval and timer off.
 723           The /proc entries can also be read from, showing the current settings.
 724
 725 config APPLDATA_MEM
 726         def_tristate m
 727         prompt "Monitor memory management statistics"
 728         depends on APPLDATA_BASE && VM_EVENT_COUNTERS
 729         help
 730           This provides memory management related data to the Linux - VM Monitor
 731           Stream, like paging/swapping rate, memory utilisation, etc.
 732           Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
 733           APPLDATA monitor record, i.e. enables or disables monitoring this record
 734           on the z/VM side.
 735
 736           Default is disabled.
 737           The /proc entry can also be read from, showing the current settings.
 738
 739           This can also be compiled as a module, which will be called
 740           appldata_mem.o.
 741
 742 config APPLDATA_OS
 743         def_tristate m
 744         prompt "Monitor OS statistics"
 745         depends on APPLDATA_BASE
 746         help
 747           This provides OS related data to the Linux - VM Monitor Stream, like
 748           CPU utilisation, etc.
 749           Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
 750           APPLDATA monitor record, i.e. enables or disables monitoring this record
 751           on the z/VM side.
 752
 753           Default is disabled.
 754           This can also be compiled as a module, which will be called
 755           appldata_os.o.
 756
 757 config APPLDATA_NET_SUM
 758         def_tristate m
 759         prompt "Monitor overall network statistics"
 760         depends on APPLDATA_BASE && NET
 761         help
 762           This provides network related data to the Linux - VM Monitor Stream,
 763           currently there is only a total sum of network I/O statistics, no
 764           per-interface data.
 765           Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
 766           APPLDATA monitor record, i.e. enables or disables monitoring this record
 767           on the z/VM side.
 768
 769           Default is disabled.
 770           This can also be compiled as a module, which will be called
 771           appldata_net_sum.o.
 772
 773 config S390_HYPFS_FS
 774         def_bool y
 775         prompt "s390 hypervisor file system support"
 776         select SYS_HYPERVISOR
 777         help
 778           This is a virtual file system intended to provide accounting
 779           information in an s390 hypervisor environment.
 780
 781 source "arch/s390/kvm/Kconfig"
 782
 783 config S390_GUEST
 784         def_bool y
 785         prompt "s390 support for virtio devices"
 786         depends on 64BIT
 787         select TTY
 788         select VIRTUALIZATION
 789         select VIRTIO
 790         select VIRTIO_CONSOLE
 791         help
 792           Enabling this option adds support for virtio based paravirtual device
 793           drivers on s390.
 794
 795           Select this option if you want to run the kernel as a guest under
 796           the KVM hypervisor.
 797
 798 endmenu