1config MMU 2 def_bool y 3 4config ZONE_DMA 5 def_bool y 6 7config LOCKDEP_SUPPORT 8 def_bool y 9 10config STACKTRACE_SUPPORT 11 def_bool y 12 13config RWSEM_GENERIC_SPINLOCK 14 bool 15 16config RWSEM_XCHGADD_ALGORITHM 17 def_bool y 18 19config ARCH_HAS_ILOG2_U32 20 def_bool n 21 22config ARCH_HAS_ILOG2_U64 23 def_bool n 24 25config GENERIC_HWEIGHT 26 def_bool y 27 28config GENERIC_BUG 29 def_bool y if BUG 30 31config GENERIC_BUG_RELATIVE_POINTERS 32 def_bool y 33 34config ARCH_DMA_ADDR_T_64BIT 35 def_bool y 36 37config GENERIC_LOCKBREAK 38 def_bool y if SMP && PREEMPT 39 40config PGSTE 41 def_bool y if KVM 42 43config ARCH_SUPPORTS_DEBUG_PAGEALLOC 44 def_bool y 45 46config KEXEC 47 def_bool y 48 select KEXEC_CORE 49 50config AUDIT_ARCH 51 def_bool y 52 53config NO_IOPORT_MAP 54 def_bool y 55 56config PCI_QUIRKS 57 def_bool n 58 59config ARCH_SUPPORTS_UPROBES 60 def_bool y 61 62config S390 63 def_bool y 64 select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE 65 select ARCH_HAS_DEBUG_STRICT_USER_COPY_CHECKS 66 select ARCH_HAS_DEVMEM_IS_ALLOWED 67 select ARCH_HAS_ELF_RANDOMIZE 68 select ARCH_HAS_GCOV_PROFILE_ALL 69 select ARCH_HAS_SG_CHAIN 70 select ARCH_HAVE_NMI_SAFE_CMPXCHG 71 select ARCH_INLINE_READ_LOCK 72 select ARCH_INLINE_READ_LOCK_BH 73 select ARCH_INLINE_READ_LOCK_IRQ 74 select ARCH_INLINE_READ_LOCK_IRQSAVE 75 select ARCH_INLINE_READ_TRYLOCK 76 select ARCH_INLINE_READ_UNLOCK 77 select ARCH_INLINE_READ_UNLOCK_BH 78 select ARCH_INLINE_READ_UNLOCK_IRQ 79 select ARCH_INLINE_READ_UNLOCK_IRQRESTORE 80 select ARCH_INLINE_SPIN_LOCK 81 select ARCH_INLINE_SPIN_LOCK_BH 82 select ARCH_INLINE_SPIN_LOCK_IRQ 83 select ARCH_INLINE_SPIN_LOCK_IRQSAVE 84 select ARCH_INLINE_SPIN_TRYLOCK 85 select ARCH_INLINE_SPIN_TRYLOCK_BH 86 select ARCH_INLINE_SPIN_UNLOCK 87 select ARCH_INLINE_SPIN_UNLOCK_BH 88 select ARCH_INLINE_SPIN_UNLOCK_IRQ 89 select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE 90 select ARCH_INLINE_WRITE_LOCK 91 select ARCH_INLINE_WRITE_LOCK_BH 92 select ARCH_INLINE_WRITE_LOCK_IRQ 93 select ARCH_INLINE_WRITE_LOCK_IRQSAVE 94 select ARCH_INLINE_WRITE_TRYLOCK 95 select ARCH_INLINE_WRITE_UNLOCK 96 select ARCH_INLINE_WRITE_UNLOCK_BH 97 select ARCH_INLINE_WRITE_UNLOCK_IRQ 98 select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE 99 select ARCH_SAVE_PAGE_KEYS if HIBERNATION 100 select ARCH_SUPPORTS_ATOMIC_RMW 101 select ARCH_SUPPORTS_NUMA_BALANCING 102 select ARCH_USE_BUILTIN_BSWAP 103 select ARCH_USE_CMPXCHG_LOCKREF 104 select ARCH_WANTS_PROT_NUMA_PROT_NONE 105 select ARCH_WANT_IPC_PARSE_VERSION 106 select BUILDTIME_EXTABLE_SORT 107 select CLONE_BACKWARDS2 108 select DYNAMIC_FTRACE if FUNCTION_TRACER 109 select GENERIC_CLOCKEVENTS 110 select GENERIC_CPU_AUTOPROBE 111 select GENERIC_CPU_DEVICES if !SMP 112 select GENERIC_FIND_FIRST_BIT 113 select GENERIC_SMP_IDLE_THREAD 114 select GENERIC_TIME_VSYSCALL 115 select HAVE_ALIGNED_STRUCT_PAGE if SLUB 116 select HAVE_ARCH_AUDITSYSCALL 117 select HAVE_ARCH_EARLY_PFN_TO_NID 118 select HAVE_ARCH_JUMP_LABEL 119 select HAVE_ARCH_SECCOMP_FILTER 120 select HAVE_ARCH_SOFT_DIRTY 121 select HAVE_ARCH_TRACEHOOK 122 select HAVE_ARCH_TRANSPARENT_HUGEPAGE 123 select HAVE_BPF_JIT if PACK_STACK && HAVE_MARCH_Z196_FEATURES 124 select HAVE_CMPXCHG_DOUBLE 125 select HAVE_CMPXCHG_LOCAL 126 select HAVE_DEBUG_KMEMLEAK 127 select HAVE_DMA_API_DEBUG 128 select HAVE_DYNAMIC_FTRACE 129 select HAVE_DYNAMIC_FTRACE_WITH_REGS 130 select HAVE_FTRACE_MCOUNT_RECORD 131 select HAVE_FUNCTION_GRAPH_TRACER 132 select HAVE_FUNCTION_TRACER 133 select HAVE_FUTEX_CMPXCHG if FUTEX 134 select HAVE_KERNEL_BZIP2 135 select HAVE_KERNEL_GZIP 136 select HAVE_KERNEL_LZ4 137 select HAVE_KERNEL_LZMA 138 select HAVE_KERNEL_LZO 139 select HAVE_KERNEL_XZ 140 select HAVE_KPROBES 141 select HAVE_KRETPROBES 142 select HAVE_KVM 143 select HAVE_LIVEPATCH 144 select HAVE_MEMBLOCK 145 select HAVE_MEMBLOCK_NODE_MAP 146 select HAVE_MEMBLOCK_PHYS_MAP 147 select HAVE_MOD_ARCH_SPECIFIC 148 select HAVE_OPROFILE 149 select HAVE_PERF_EVENTS 150 select HAVE_REGS_AND_STACK_ACCESS_API 151 select HAVE_SYSCALL_TRACEPOINTS 152 select HAVE_VIRT_CPU_ACCOUNTING 153 select MODULES_USE_ELF_RELA 154 select NO_BOOTMEM 155 select OLD_SIGACTION 156 select OLD_SIGSUSPEND3 157 select SYSCTL_EXCEPTION_TRACE 158 select TTY 159 select VIRT_CPU_ACCOUNTING 160 select VIRT_TO_BUS 161 162 163config SCHED_OMIT_FRAME_POINTER 164 def_bool y 165 166config PGTABLE_LEVELS 167 int 168 default 4 169 170source "init/Kconfig" 171 172source "kernel/Kconfig.freezer" 173 174source "kernel/livepatch/Kconfig" 175 176menu "Processor type and features" 177 178config HAVE_MARCH_Z900_FEATURES 179 def_bool n 180 181config HAVE_MARCH_Z990_FEATURES 182 def_bool n 183 select HAVE_MARCH_Z900_FEATURES 184 185config HAVE_MARCH_Z9_109_FEATURES 186 def_bool n 187 select HAVE_MARCH_Z990_FEATURES 188 189config HAVE_MARCH_Z10_FEATURES 190 def_bool n 191 select HAVE_MARCH_Z9_109_FEATURES 192 193config HAVE_MARCH_Z196_FEATURES 194 def_bool n 195 select HAVE_MARCH_Z10_FEATURES 196 197config HAVE_MARCH_ZEC12_FEATURES 198 def_bool n 199 select HAVE_MARCH_Z196_FEATURES 200 201config HAVE_MARCH_Z13_FEATURES 202 def_bool n 203 select HAVE_MARCH_ZEC12_FEATURES 204 205choice 206 prompt "Processor type" 207 default MARCH_Z900 208 209config MARCH_Z900 210 bool "IBM zSeries model z800 and z900" 211 select HAVE_MARCH_Z900_FEATURES 212 help 213 Select this to enable optimizations for model z800/z900 (2064 and 214 2066 series). This will enable some optimizations that are not 215 available on older ESA/390 (31 Bit) only CPUs. 216 217config MARCH_Z990 218 bool "IBM zSeries model z890 and z990" 219 select HAVE_MARCH_Z990_FEATURES 220 help 221 Select this to enable optimizations for model z890/z990 (2084 and 222 2086 series). The kernel will be slightly faster but will not work 223 on older machines. 224 225config MARCH_Z9_109 226 bool "IBM System z9" 227 select HAVE_MARCH_Z9_109_FEATURES 228 help 229 Select this to enable optimizations for IBM System z9 (2094 and 230 2096 series). The kernel will be slightly faster but will not work 231 on older machines. 232 233config MARCH_Z10 234 bool "IBM System z10" 235 select HAVE_MARCH_Z10_FEATURES 236 help 237 Select this to enable optimizations for IBM System z10 (2097 and 238 2098 series). The kernel will be slightly faster but will not work 239 on older machines. 240 241config MARCH_Z196 242 bool "IBM zEnterprise 114 and 196" 243 select HAVE_MARCH_Z196_FEATURES 244 help 245 Select this to enable optimizations for IBM zEnterprise 114 and 196 246 (2818 and 2817 series). The kernel will be slightly faster but will 247 not work on older machines. 248 249config MARCH_ZEC12 250 bool "IBM zBC12 and zEC12" 251 select HAVE_MARCH_ZEC12_FEATURES 252 help 253 Select this to enable optimizations for IBM zBC12 and zEC12 (2828 and 254 2827 series). The kernel will be slightly faster but will not work on 255 older machines. 256 257config MARCH_Z13 258 bool "IBM z13s and z13" 259 select HAVE_MARCH_Z13_FEATURES 260 help 261 Select this to enable optimizations for IBM z13s and z13 (2965 and 262 2964 series). The kernel will be slightly faster but will not work on 263 older machines. 264 265endchoice 266 267config MARCH_Z900_TUNE 268 def_bool TUNE_Z900 || MARCH_Z900 && TUNE_DEFAULT 269 270config MARCH_Z990_TUNE 271 def_bool TUNE_Z990 || MARCH_Z990 && TUNE_DEFAULT 272 273config MARCH_Z9_109_TUNE 274 def_bool TUNE_Z9_109 || MARCH_Z9_109 && TUNE_DEFAULT 275 276config MARCH_Z10_TUNE 277 def_bool TUNE_Z10 || MARCH_Z10 && TUNE_DEFAULT 278 279config MARCH_Z196_TUNE 280 def_bool TUNE_Z196 || MARCH_Z196 && TUNE_DEFAULT 281 282config MARCH_ZEC12_TUNE 283 def_bool TUNE_ZEC12 || MARCH_ZEC12 && TUNE_DEFAULT 284 285config MARCH_Z13_TUNE 286 def_bool TUNE_Z13 || MARCH_Z13 && TUNE_DEFAULT 287 288choice 289 prompt "Tune code generation" 290 default TUNE_DEFAULT 291 help 292 Cause the compiler to tune (-mtune) the generated code for a machine. 293 This will make the code run faster on the selected machine but 294 somewhat slower on other machines. 295 This option only changes how the compiler emits instructions, not the 296 selection of instructions itself, so the resulting kernel will run on 297 all other machines. 298 299config TUNE_DEFAULT 300 bool "Default" 301 help 302 Tune the generated code for the target processor for which the kernel 303 will be compiled. 304 305config TUNE_Z900 306 bool "IBM zSeries model z800 and z900" 307 308config TUNE_Z990 309 bool "IBM zSeries model z890 and z990" 310 311config TUNE_Z9_109 312 bool "IBM System z9" 313 314config TUNE_Z10 315 bool "IBM System z10" 316 317config TUNE_Z196 318 bool "IBM zEnterprise 114 and 196" 319 320config TUNE_ZEC12 321 bool "IBM zBC12 and zEC12" 322 323config TUNE_Z13 324 bool "IBM z13" 325 326endchoice 327 328config 64BIT 329 def_bool y 330 331config COMPAT 332 def_bool y 333 prompt "Kernel support for 31 bit emulation" 334 select COMPAT_BINFMT_ELF if BINFMT_ELF 335 select ARCH_WANT_OLD_COMPAT_IPC 336 select COMPAT_OLD_SIGACTION 337 depends on MULTIUSER 338 help 339 Select this option if you want to enable your system kernel to 340 handle system-calls from ELF binaries for 31 bit ESA. This option 341 (and some other stuff like libraries and such) is needed for 342 executing 31 bit applications. It is safe to say "Y". 343 344config SYSVIPC_COMPAT 345 def_bool y if COMPAT && SYSVIPC 346 347config KEYS_COMPAT 348 def_bool y if COMPAT && KEYS 349 350config SMP 351 def_bool y 352 prompt "Symmetric multi-processing support" 353 ---help--- 354 This enables support for systems with more than one CPU. If you have 355 a system with only one CPU, like most personal computers, say N. If 356 you have a system with more than one CPU, say Y. 357 358 If you say N here, the kernel will run on uni- and multiprocessor 359 machines, but will use only one CPU of a multiprocessor machine. If 360 you say Y here, the kernel will run on many, but not all, 361 uniprocessor machines. On a uniprocessor machine, the kernel 362 will run faster if you say N here. 363 364 See also the SMP-HOWTO available at 365 <http://www.tldp.org/docs.html#howto>. 366 367 Even if you don't know what to do here, say Y. 368 369config NR_CPUS 370 int "Maximum number of CPUs (2-512)" 371 range 2 512 372 depends on SMP 373 default "64" 374 help 375 This allows you to specify the maximum number of CPUs which this 376 kernel will support. The maximum supported value is 512 and the 377 minimum value which makes sense is 2. 378 379 This is purely to save memory - each supported CPU adds 380 approximately sixteen kilobytes to the kernel image. 381 382config HOTPLUG_CPU 383 def_bool y 384 prompt "Support for hot-pluggable CPUs" 385 depends on SMP 386 help 387 Say Y here to be able to turn CPUs off and on. CPUs 388 can be controlled through /sys/devices/system/cpu/cpu#. 389 Say N if you want to disable CPU hotplug. 390 391# Some NUMA nodes have memory ranges that span 392# other nodes. Even though a pfn is valid and 393# between a node's start and end pfns, it may not 394# reside on that node. See memmap_init_zone() 395# for details. <- They meant memory holes! 396config NODES_SPAN_OTHER_NODES 397 def_bool NUMA 398 399config NUMA 400 bool "NUMA support" 401 depends on SMP && SCHED_TOPOLOGY 402 default n 403 help 404 Enable NUMA support 405 406 This option adds NUMA support to the kernel. 407 408 An operation mode can be selected by appending 409 numa=<method> to the kernel command line. 410 411 The default behaviour is identical to appending numa=plain to 412 the command line. This will create just one node with all 413 available memory and all CPUs in it. 414 415config NODES_SHIFT 416 int "Maximum NUMA nodes (as a power of 2)" 417 range 1 10 418 depends on NUMA 419 default "4" 420 help 421 Specify the maximum number of NUMA nodes available on the target 422 system. Increases memory reserved to accommodate various tables. 423 424menu "Select NUMA modes" 425 depends on NUMA 426 427config NUMA_EMU 428 bool "NUMA emulation" 429 default y 430 help 431 Numa emulation mode will split the available system memory into 432 equal chunks which then are distributed over the configured number 433 of nodes in a round-robin manner. 434 435 The number of fake nodes is limited by the number of available memory 436 chunks (i.e. memory size / fake size) and the number of supported 437 nodes in the kernel. 438 439 The CPUs are assigned to the nodes in a way that partially respects 440 the original machine topology (if supported by the machine). 441 Fair distribution of the CPUs is not guaranteed. 442 443config EMU_SIZE 444 hex "NUMA emulation memory chunk size" 445 default 0x10000000 446 range 0x400000 0x100000000 447 depends on NUMA_EMU 448 help 449 Select the default size by which the memory is chopped and then 450 assigned to emulated NUMA nodes. 451 452 This can be overridden by specifying 453 454 emu_size=<n> 455 456 on the kernel command line where also suffixes K, M, G, and T are 457 supported. 458 459endmenu 460 461config SCHED_SMT 462 def_bool n 463 464config SCHED_MC 465 def_bool n 466 467config SCHED_BOOK 468 def_bool n 469 470config SCHED_TOPOLOGY 471 def_bool y 472 prompt "Topology scheduler support" 473 depends on SMP 474 select SCHED_SMT 475 select SCHED_MC 476 select SCHED_BOOK 477 help 478 Topology scheduler support improves the CPU scheduler's decision 479 making when dealing with machines that have multi-threading, 480 multiple cores or multiple books. 481 482source kernel/Kconfig.preempt 483 484source kernel/Kconfig.hz 485 486endmenu 487 488menu "Memory setup" 489 490config ARCH_SPARSEMEM_ENABLE 491 def_bool y 492 select SPARSEMEM_VMEMMAP_ENABLE 493 select SPARSEMEM_VMEMMAP 494 495config ARCH_SPARSEMEM_DEFAULT 496 def_bool y 497 498config ARCH_SELECT_MEMORY_MODEL 499 def_bool y 500 501config ARCH_ENABLE_MEMORY_HOTPLUG 502 def_bool y if SPARSEMEM 503 504config ARCH_ENABLE_MEMORY_HOTREMOVE 505 def_bool y 506 507config ARCH_ENABLE_SPLIT_PMD_PTLOCK 508 def_bool y 509 510config FORCE_MAX_ZONEORDER 511 int 512 default "9" 513 514source "mm/Kconfig" 515 516config PACK_STACK 517 def_bool y 518 prompt "Pack kernel stack" 519 help 520 This option enables the compiler option -mkernel-backchain if it 521 is available. If the option is available the compiler supports 522 the new stack layout which dramatically reduces the minimum stack 523 frame size. With an old compiler a non-leaf function needs a 524 minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With 525 -mkernel-backchain the minimum size drops to 16 byte on 31 bit 526 and 24 byte on 64 bit. 527 528 Say Y if you are unsure. 529 530config CHECK_STACK 531 def_bool y 532 prompt "Detect kernel stack overflow" 533 help 534 This option enables the compiler option -mstack-guard and 535 -mstack-size if they are available. If the compiler supports them 536 it will emit additional code to each function prolog to trigger 537 an illegal operation if the kernel stack is about to overflow. 538 539 Say N if you are unsure. 540 541config STACK_GUARD 542 int "Size of the guard area (128-1024)" 543 range 128 1024 544 depends on CHECK_STACK 545 default "256" 546 help 547 This allows you to specify the size of the guard area at the lower 548 end of the kernel stack. If the kernel stack points into the guard 549 area on function entry an illegal operation is triggered. The size 550 needs to be a power of 2. Please keep in mind that the size of an 551 interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit. 552 The minimum size for the stack guard should be 256 for 31 bit and 553 512 for 64 bit. 554 555config WARN_DYNAMIC_STACK 556 def_bool n 557 prompt "Emit compiler warnings for function with dynamic stack usage" 558 help 559 This option enables the compiler option -mwarn-dynamicstack. If the 560 compiler supports this options generates warnings for functions 561 that dynamically allocate stack space using alloca. 562 563 Say N if you are unsure. 564 565endmenu 566 567menu "I/O subsystem" 568 569config QDIO 570 def_tristate y 571 prompt "QDIO support" 572 ---help--- 573 This driver provides the Queued Direct I/O base support for 574 IBM System z. 575 576 To compile this driver as a module, choose M here: the 577 module will be called qdio. 578 579 If unsure, say Y. 580 581menuconfig PCI 582 bool "PCI support" 583 select PCI_MSI 584 select IOMMU_SUPPORT 585 help 586 Enable PCI support. 587 588if PCI 589 590config PCI_NR_FUNCTIONS 591 int "Maximum number of PCI functions (1-4096)" 592 range 1 4096 593 default "64" 594 help 595 This allows you to specify the maximum number of PCI functions which 596 this kernel will support. 597 598config PCI_NR_MSI 599 int "Maximum number of MSI interrupts (64-32768)" 600 range 64 32768 601 default "256" 602 help 603 This defines the number of virtual interrupts the kernel will 604 provide for MSI interrupts. If you configure your system to have 605 too few drivers will fail to allocate MSI interrupts for all 606 PCI devices. 607 608source "drivers/pci/Kconfig" 609 610endif # PCI 611 612config PCI_DOMAINS 613 def_bool PCI 614 615config HAS_IOMEM 616 def_bool PCI 617 618config IOMMU_HELPER 619 def_bool PCI 620 621config NEED_SG_DMA_LENGTH 622 def_bool PCI 623 624config NEED_DMA_MAP_STATE 625 def_bool PCI 626 627config CHSC_SCH 628 def_tristate m 629 prompt "Support for CHSC subchannels" 630 help 631 This driver allows usage of CHSC subchannels. A CHSC subchannel 632 is usually present on LPAR only. 633 The driver creates a device /dev/chsc, which may be used to 634 obtain I/O configuration information about the machine and 635 to issue asynchronous chsc commands (DANGEROUS). 636 You will usually only want to use this interface on a special 637 LPAR designated for system management. 638 639 To compile this driver as a module, choose M here: the 640 module will be called chsc_sch. 641 642 If unsure, say N. 643 644config SCM_BUS 645 def_bool y 646 prompt "SCM bus driver" 647 help 648 Bus driver for Storage Class Memory. 649 650config EADM_SCH 651 def_tristate m 652 prompt "Support for EADM subchannels" 653 depends on SCM_BUS 654 help 655 This driver allows usage of EADM subchannels. EADM subchannels act 656 as a communication vehicle for SCM increments. 657 658 To compile this driver as a module, choose M here: the 659 module will be called eadm_sch. 660 661endmenu 662 663menu "Dump support" 664 665config CRASH_DUMP 666 bool "kernel crash dumps" 667 depends on SMP 668 select KEXEC 669 help 670 Generate crash dump after being started by kexec. 671 Crash dump kernels are loaded in the main kernel with kexec-tools 672 into a specially reserved region and then later executed after 673 a crash by kdump/kexec. 674 Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this. 675 This option also enables s390 zfcpdump. 676 See also <file:Documentation/s390/zfcpdump.txt> 677 678endmenu 679 680menu "Executable file formats / Emulations" 681 682source "fs/Kconfig.binfmt" 683 684config SECCOMP 685 def_bool y 686 prompt "Enable seccomp to safely compute untrusted bytecode" 687 depends on PROC_FS 688 help 689 This kernel feature is useful for number crunching applications 690 that may need to compute untrusted bytecode during their 691 execution. By using pipes or other transports made available to 692 the process as file descriptors supporting the read/write 693 syscalls, it's possible to isolate those applications in 694 their own address space using seccomp. Once seccomp is 695 enabled via /proc/<pid>/seccomp, it cannot be disabled 696 and the task is only allowed to execute a few safe syscalls 697 defined by each seccomp mode. 698 699 If unsure, say Y. 700 701endmenu 702 703menu "Power Management" 704 705config ARCH_HIBERNATION_POSSIBLE 706 def_bool y 707 708source "kernel/power/Kconfig" 709 710endmenu 711 712source "net/Kconfig" 713 714config PCMCIA 715 def_bool n 716 717config CCW 718 def_bool y 719 720source "drivers/Kconfig" 721 722source "fs/Kconfig" 723 724source "arch/s390/Kconfig.debug" 725 726source "security/Kconfig" 727 728source "crypto/Kconfig" 729 730source "lib/Kconfig" 731 732menu "Virtualization" 733 734config PFAULT 735 def_bool y 736 prompt "Pseudo page fault support" 737 help 738 Select this option, if you want to use PFAULT pseudo page fault 739 handling under VM. If running native or in LPAR, this option 740 has no effect. If your VM does not support PFAULT, PAGEEX 741 pseudo page fault handling will be used. 742 Note that VM 4.2 supports PFAULT but has a bug in its 743 implementation that causes some problems. 744 Everybody who wants to run Linux under VM != VM4.2 should select 745 this option. 746 747config SHARED_KERNEL 748 bool "VM shared kernel support" 749 depends on !JUMP_LABEL 750 help 751 Select this option, if you want to share the text segment of the 752 Linux kernel between different VM guests. This reduces memory 753 usage with lots of guests but greatly increases kernel size. 754 Also if a kernel was IPL'ed from a shared segment the kexec system 755 call will not work. 756 You should only select this option if you know what you are 757 doing and want to exploit this feature. 758 759config CMM 760 def_tristate n 761 prompt "Cooperative memory management" 762 help 763 Select this option, if you want to enable the kernel interface 764 to reduce the memory size of the system. This is accomplished 765 by allocating pages of memory and put them "on hold". This only 766 makes sense for a system running under VM where the unused pages 767 will be reused by VM for other guest systems. The interface 768 allows an external monitor to balance memory of many systems. 769 Everybody who wants to run Linux under VM should select this 770 option. 771 772config CMM_IUCV 773 def_bool y 774 prompt "IUCV special message interface to cooperative memory management" 775 depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV) 776 help 777 Select this option to enable the special message interface to 778 the cooperative memory management. 779 780config APPLDATA_BASE 781 def_bool n 782 prompt "Linux - VM Monitor Stream, base infrastructure" 783 depends on PROC_FS 784 help 785 This provides a kernel interface for creating and updating z/VM APPLDATA 786 monitor records. The monitor records are updated at certain time 787 intervals, once the timer is started. 788 Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer, 789 i.e. enables or disables monitoring on the Linux side. 790 A custom interval value (in seconds) can be written to 791 /proc/appldata/interval. 792 793 Defaults are 60 seconds interval and timer off. 794 The /proc entries can also be read from, showing the current settings. 795 796config APPLDATA_MEM 797 def_tristate m 798 prompt "Monitor memory management statistics" 799 depends on APPLDATA_BASE && VM_EVENT_COUNTERS 800 help 801 This provides memory management related data to the Linux - VM Monitor 802 Stream, like paging/swapping rate, memory utilisation, etc. 803 Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM 804 APPLDATA monitor record, i.e. enables or disables monitoring this record 805 on the z/VM side. 806 807 Default is disabled. 808 The /proc entry can also be read from, showing the current settings. 809 810 This can also be compiled as a module, which will be called 811 appldata_mem.o. 812 813config APPLDATA_OS 814 def_tristate m 815 prompt "Monitor OS statistics" 816 depends on APPLDATA_BASE 817 help 818 This provides OS related data to the Linux - VM Monitor Stream, like 819 CPU utilisation, etc. 820 Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM 821 APPLDATA monitor record, i.e. enables or disables monitoring this record 822 on the z/VM side. 823 824 Default is disabled. 825 This can also be compiled as a module, which will be called 826 appldata_os.o. 827 828config APPLDATA_NET_SUM 829 def_tristate m 830 prompt "Monitor overall network statistics" 831 depends on APPLDATA_BASE && NET 832 help 833 This provides network related data to the Linux - VM Monitor Stream, 834 currently there is only a total sum of network I/O statistics, no 835 per-interface data. 836 Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM 837 APPLDATA monitor record, i.e. enables or disables monitoring this record 838 on the z/VM side. 839 840 Default is disabled. 841 This can also be compiled as a module, which will be called 842 appldata_net_sum.o. 843 844config S390_HYPFS_FS 845 def_bool y 846 prompt "s390 hypervisor file system support" 847 select SYS_HYPERVISOR 848 help 849 This is a virtual file system intended to provide accounting 850 information in an s390 hypervisor environment. 851 852source "arch/s390/kvm/Kconfig" 853 854config S390_GUEST 855 def_bool y 856 prompt "s390 support for virtio devices" 857 select TTY 858 select VIRTUALIZATION 859 select VIRTIO 860 select VIRTIO_CONSOLE 861 help 862 Enabling this option adds support for virtio based paravirtual device 863 drivers on s390. 864 865 Select this option if you want to run the kernel as a guest under 866 the KVM hypervisor. 867 868endmenu 869