1# SPDX-License-Identifier: GPL-2.0 2config MMU 3 def_bool y 4 5config ZONE_DMA 6 def_bool y 7 8config CPU_BIG_ENDIAN 9 def_bool y 10 11config LOCKDEP_SUPPORT 12 def_bool y 13 14config STACKTRACE_SUPPORT 15 def_bool y 16 17config RWSEM_GENERIC_SPINLOCK 18 bool 19 20config RWSEM_XCHGADD_ALGORITHM 21 def_bool y 22 23config ARCH_HAS_ILOG2_U32 24 def_bool n 25 26config ARCH_HAS_ILOG2_U64 27 def_bool n 28 29config GENERIC_HWEIGHT 30 def_bool y 31 32config GENERIC_BUG 33 def_bool y if BUG 34 35config GENERIC_BUG_RELATIVE_POINTERS 36 def_bool y 37 38config ARCH_DMA_ADDR_T_64BIT 39 def_bool y 40 41config GENERIC_LOCKBREAK 42 def_bool y if SMP && PREEMPT 43 44config PGSTE 45 def_bool y if KVM 46 47config ARCH_SUPPORTS_DEBUG_PAGEALLOC 48 def_bool y 49 50config KEXEC 51 def_bool y 52 select KEXEC_CORE 53 54config AUDIT_ARCH 55 def_bool y 56 57config NO_IOPORT_MAP 58 def_bool y 59 60config PCI_QUIRKS 61 def_bool n 62 63config ARCH_SUPPORTS_UPROBES 64 def_bool y 65 66config S390 67 def_bool y 68 select ARCH_BINFMT_ELF_STATE 69 select ARCH_HAS_DEVMEM_IS_ALLOWED 70 select ARCH_HAS_ELF_RANDOMIZE 71 select ARCH_HAS_FORTIFY_SOURCE 72 select ARCH_HAS_GCOV_PROFILE_ALL 73 select ARCH_HAS_GIGANTIC_PAGE if (MEMORY_ISOLATION && COMPACTION) || CMA 74 select ARCH_HAS_KCOV 75 select ARCH_HAS_SET_MEMORY 76 select ARCH_HAS_SG_CHAIN 77 select ARCH_HAS_STRICT_KERNEL_RWX 78 select ARCH_HAS_STRICT_MODULE_RWX 79 select ARCH_HAS_UBSAN_SANITIZE_ALL 80 select ARCH_HAVE_NMI_SAFE_CMPXCHG 81 select ARCH_INLINE_READ_LOCK 82 select ARCH_INLINE_READ_LOCK_BH 83 select ARCH_INLINE_READ_LOCK_IRQ 84 select ARCH_INLINE_READ_LOCK_IRQSAVE 85 select ARCH_INLINE_READ_TRYLOCK 86 select ARCH_INLINE_READ_UNLOCK 87 select ARCH_INLINE_READ_UNLOCK_BH 88 select ARCH_INLINE_READ_UNLOCK_IRQ 89 select ARCH_INLINE_READ_UNLOCK_IRQRESTORE 90 select ARCH_INLINE_SPIN_LOCK 91 select ARCH_INLINE_SPIN_LOCK_BH 92 select ARCH_INLINE_SPIN_LOCK_IRQ 93 select ARCH_INLINE_SPIN_LOCK_IRQSAVE 94 select ARCH_INLINE_SPIN_TRYLOCK 95 select ARCH_INLINE_SPIN_TRYLOCK_BH 96 select ARCH_INLINE_SPIN_UNLOCK 97 select ARCH_INLINE_SPIN_UNLOCK_BH 98 select ARCH_INLINE_SPIN_UNLOCK_IRQ 99 select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE 100 select ARCH_INLINE_WRITE_LOCK 101 select ARCH_INLINE_WRITE_LOCK_BH 102 select ARCH_INLINE_WRITE_LOCK_IRQ 103 select ARCH_INLINE_WRITE_LOCK_IRQSAVE 104 select ARCH_INLINE_WRITE_TRYLOCK 105 select ARCH_INLINE_WRITE_UNLOCK 106 select ARCH_INLINE_WRITE_UNLOCK_BH 107 select ARCH_INLINE_WRITE_UNLOCK_IRQ 108 select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE 109 select ARCH_SAVE_PAGE_KEYS if HIBERNATION 110 select ARCH_SUPPORTS_ATOMIC_RMW 111 select ARCH_SUPPORTS_DEFERRED_STRUCT_PAGE_INIT 112 select ARCH_SUPPORTS_NUMA_BALANCING 113 select ARCH_USE_BUILTIN_BSWAP 114 select ARCH_USE_CMPXCHG_LOCKREF 115 select ARCH_WANTS_DYNAMIC_TASK_STRUCT 116 select ARCH_WANTS_PROT_NUMA_PROT_NONE 117 select ARCH_WANTS_UBSAN_NO_NULL 118 select ARCH_WANT_IPC_PARSE_VERSION 119 select BUILDTIME_EXTABLE_SORT 120 select CLONE_BACKWARDS2 121 select DYNAMIC_FTRACE if FUNCTION_TRACER 122 select GENERIC_CLOCKEVENTS 123 select GENERIC_CPU_AUTOPROBE 124 select GENERIC_CPU_DEVICES if !SMP 125 select GENERIC_FIND_FIRST_BIT 126 select GENERIC_SMP_IDLE_THREAD 127 select GENERIC_TIME_VSYSCALL 128 select HAVE_ALIGNED_STRUCT_PAGE if SLUB 129 select HAVE_ARCH_AUDITSYSCALL 130 select HAVE_ARCH_JUMP_LABEL 131 select CPU_NO_EFFICIENT_FFS if !HAVE_MARCH_Z9_109_FEATURES 132 select HAVE_ARCH_SECCOMP_FILTER 133 select HAVE_ARCH_SOFT_DIRTY 134 select HAVE_ARCH_TRACEHOOK 135 select HAVE_ARCH_TRANSPARENT_HUGEPAGE 136 select HAVE_EBPF_JIT if PACK_STACK && HAVE_MARCH_Z196_FEATURES 137 select HAVE_CMPXCHG_DOUBLE 138 select HAVE_CMPXCHG_LOCAL 139 select HAVE_COPY_THREAD_TLS 140 select HAVE_DEBUG_KMEMLEAK 141 select HAVE_DMA_API_DEBUG 142 select HAVE_DMA_CONTIGUOUS 143 select DMA_NOOP_OPS 144 select HAVE_DYNAMIC_FTRACE 145 select HAVE_DYNAMIC_FTRACE_WITH_REGS 146 select HAVE_EFFICIENT_UNALIGNED_ACCESS 147 select HAVE_FTRACE_MCOUNT_RECORD 148 select HAVE_FUNCTION_GRAPH_TRACER 149 select HAVE_FUNCTION_TRACER 150 select HAVE_FUTEX_CMPXCHG if FUTEX 151 select HAVE_KERNEL_BZIP2 152 select HAVE_KERNEL_GZIP 153 select HAVE_KERNEL_LZ4 154 select HAVE_KERNEL_LZMA 155 select HAVE_KERNEL_LZO 156 select HAVE_KERNEL_XZ 157 select HAVE_KPROBES 158 select HAVE_KRETPROBES 159 select HAVE_KVM 160 select HAVE_LIVEPATCH 161 select HAVE_MEMBLOCK 162 select HAVE_MEMBLOCK_NODE_MAP 163 select HAVE_MEMBLOCK_PHYS_MAP 164 select HAVE_MOD_ARCH_SPECIFIC 165 select HAVE_OPROFILE 166 select HAVE_PERF_EVENTS 167 select HAVE_REGS_AND_STACK_ACCESS_API 168 select HAVE_SYSCALL_TRACEPOINTS 169 select HAVE_VIRT_CPU_ACCOUNTING 170 select MODULES_USE_ELF_RELA 171 select NO_BOOTMEM 172 select OLD_SIGACTION 173 select OLD_SIGSUSPEND3 174 select SPARSE_IRQ 175 select SYSCTL_EXCEPTION_TRACE 176 select THREAD_INFO_IN_TASK 177 select TTY 178 select VIRT_CPU_ACCOUNTING 179 select ARCH_HAS_SCALED_CPUTIME 180 select VIRT_TO_BUS 181 select HAVE_NMI 182 183 184config SCHED_OMIT_FRAME_POINTER 185 def_bool y 186 187config PGTABLE_LEVELS 188 int 189 default 5 190 191source "init/Kconfig" 192 193source "kernel/Kconfig.freezer" 194 195source "kernel/livepatch/Kconfig" 196 197menu "Processor type and features" 198 199config HAVE_MARCH_Z900_FEATURES 200 def_bool n 201 202config HAVE_MARCH_Z990_FEATURES 203 def_bool n 204 select HAVE_MARCH_Z900_FEATURES 205 206config HAVE_MARCH_Z9_109_FEATURES 207 def_bool n 208 select HAVE_MARCH_Z990_FEATURES 209 210config HAVE_MARCH_Z10_FEATURES 211 def_bool n 212 select HAVE_MARCH_Z9_109_FEATURES 213 214config HAVE_MARCH_Z196_FEATURES 215 def_bool n 216 select HAVE_MARCH_Z10_FEATURES 217 218config HAVE_MARCH_ZEC12_FEATURES 219 def_bool n 220 select HAVE_MARCH_Z196_FEATURES 221 222config HAVE_MARCH_Z13_FEATURES 223 def_bool n 224 select HAVE_MARCH_ZEC12_FEATURES 225 226config HAVE_MARCH_Z14_FEATURES 227 def_bool n 228 select HAVE_MARCH_Z13_FEATURES 229 230choice 231 prompt "Processor type" 232 default MARCH_Z196 233 234config MARCH_Z900 235 bool "IBM zSeries model z800 and z900" 236 select HAVE_MARCH_Z900_FEATURES 237 help 238 Select this to enable optimizations for model z800/z900 (2064 and 239 2066 series). This will enable some optimizations that are not 240 available on older ESA/390 (31 Bit) only CPUs. 241 242config MARCH_Z990 243 bool "IBM zSeries model z890 and z990" 244 select HAVE_MARCH_Z990_FEATURES 245 help 246 Select this to enable optimizations for model z890/z990 (2084 and 247 2086 series). The kernel will be slightly faster but will not work 248 on older machines. 249 250config MARCH_Z9_109 251 bool "IBM System z9" 252 select HAVE_MARCH_Z9_109_FEATURES 253 help 254 Select this to enable optimizations for IBM System z9 (2094 and 255 2096 series). The kernel will be slightly faster but will not work 256 on older machines. 257 258config MARCH_Z10 259 bool "IBM System z10" 260 select HAVE_MARCH_Z10_FEATURES 261 help 262 Select this to enable optimizations for IBM System z10 (2097 and 263 2098 series). The kernel will be slightly faster but will not work 264 on older machines. 265 266config MARCH_Z196 267 bool "IBM zEnterprise 114 and 196" 268 select HAVE_MARCH_Z196_FEATURES 269 help 270 Select this to enable optimizations for IBM zEnterprise 114 and 196 271 (2818 and 2817 series). The kernel will be slightly faster but will 272 not work on older machines. 273 274config MARCH_ZEC12 275 bool "IBM zBC12 and zEC12" 276 select HAVE_MARCH_ZEC12_FEATURES 277 help 278 Select this to enable optimizations for IBM zBC12 and zEC12 (2828 and 279 2827 series). The kernel will be slightly faster but will not work on 280 older machines. 281 282config MARCH_Z13 283 bool "IBM z13s and z13" 284 select HAVE_MARCH_Z13_FEATURES 285 help 286 Select this to enable optimizations for IBM z13s and z13 (2965 and 287 2964 series). The kernel will be slightly faster but will not work on 288 older machines. 289 290config MARCH_Z14 291 bool "IBM z14" 292 select HAVE_MARCH_Z14_FEATURES 293 help 294 Select this to enable optimizations for IBM z14 (3906 series). 295 The kernel will be slightly faster but will not work on older 296 machines. 297 298endchoice 299 300config MARCH_Z900_TUNE 301 def_bool TUNE_Z900 || MARCH_Z900 && TUNE_DEFAULT 302 303config MARCH_Z990_TUNE 304 def_bool TUNE_Z990 || MARCH_Z990 && TUNE_DEFAULT 305 306config MARCH_Z9_109_TUNE 307 def_bool TUNE_Z9_109 || MARCH_Z9_109 && TUNE_DEFAULT 308 309config MARCH_Z10_TUNE 310 def_bool TUNE_Z10 || MARCH_Z10 && TUNE_DEFAULT 311 312config MARCH_Z196_TUNE 313 def_bool TUNE_Z196 || MARCH_Z196 && TUNE_DEFAULT 314 315config MARCH_ZEC12_TUNE 316 def_bool TUNE_ZEC12 || MARCH_ZEC12 && TUNE_DEFAULT 317 318config MARCH_Z13_TUNE 319 def_bool TUNE_Z13 || MARCH_Z13 && TUNE_DEFAULT 320 321config MARCH_Z14_TUNE 322 def_bool TUNE_Z14 || MARCH_Z14 && TUNE_DEFAULT 323 324choice 325 prompt "Tune code generation" 326 default TUNE_DEFAULT 327 help 328 Cause the compiler to tune (-mtune) the generated code for a machine. 329 This will make the code run faster on the selected machine but 330 somewhat slower on other machines. 331 This option only changes how the compiler emits instructions, not the 332 selection of instructions itself, so the resulting kernel will run on 333 all other machines. 334 335config TUNE_DEFAULT 336 bool "Default" 337 help 338 Tune the generated code for the target processor for which the kernel 339 will be compiled. 340 341config TUNE_Z900 342 bool "IBM zSeries model z800 and z900" 343 344config TUNE_Z990 345 bool "IBM zSeries model z890 and z990" 346 347config TUNE_Z9_109 348 bool "IBM System z9" 349 350config TUNE_Z10 351 bool "IBM System z10" 352 353config TUNE_Z196 354 bool "IBM zEnterprise 114 and 196" 355 356config TUNE_ZEC12 357 bool "IBM zBC12 and zEC12" 358 359config TUNE_Z13 360 bool "IBM z13" 361 362config TUNE_Z14 363 bool "IBM z14" 364 365endchoice 366 367config 64BIT 368 def_bool y 369 370config COMPAT 371 def_bool y 372 prompt "Kernel support for 31 bit emulation" 373 select COMPAT_BINFMT_ELF if BINFMT_ELF 374 select ARCH_WANT_OLD_COMPAT_IPC 375 select COMPAT_OLD_SIGACTION 376 depends on MULTIUSER 377 help 378 Select this option if you want to enable your system kernel to 379 handle system-calls from ELF binaries for 31 bit ESA. This option 380 (and some other stuff like libraries and such) is needed for 381 executing 31 bit applications. It is safe to say "Y". 382 383config SYSVIPC_COMPAT 384 def_bool y if COMPAT && SYSVIPC 385 386config SMP 387 def_bool y 388 prompt "Symmetric multi-processing support" 389 ---help--- 390 This enables support for systems with more than one CPU. If you have 391 a system with only one CPU, like most personal computers, say N. If 392 you have a system with more than one CPU, say Y. 393 394 If you say N here, the kernel will run on uni- and multiprocessor 395 machines, but will use only one CPU of a multiprocessor machine. If 396 you say Y here, the kernel will run on many, but not all, 397 uniprocessor machines. On a uniprocessor machine, the kernel 398 will run faster if you say N here. 399 400 See also the SMP-HOWTO available at 401 <http://www.tldp.org/docs.html#howto>. 402 403 Even if you don't know what to do here, say Y. 404 405config NR_CPUS 406 int "Maximum number of CPUs (2-512)" 407 range 2 512 408 depends on SMP 409 default "64" 410 help 411 This allows you to specify the maximum number of CPUs which this 412 kernel will support. The maximum supported value is 512 and the 413 minimum value which makes sense is 2. 414 415 This is purely to save memory - each supported CPU adds 416 approximately sixteen kilobytes to the kernel image. 417 418config HOTPLUG_CPU 419 def_bool y 420 prompt "Support for hot-pluggable CPUs" 421 depends on SMP 422 help 423 Say Y here to be able to turn CPUs off and on. CPUs 424 can be controlled through /sys/devices/system/cpu/cpu#. 425 Say N if you want to disable CPU hotplug. 426 427# Some NUMA nodes have memory ranges that span 428# other nodes. Even though a pfn is valid and 429# between a node's start and end pfns, it may not 430# reside on that node. See memmap_init_zone() 431# for details. <- They meant memory holes! 432config NODES_SPAN_OTHER_NODES 433 def_bool NUMA 434 435config NUMA 436 bool "NUMA support" 437 depends on SMP && SCHED_TOPOLOGY 438 default n 439 help 440 Enable NUMA support 441 442 This option adds NUMA support to the kernel. 443 444 An operation mode can be selected by appending 445 numa=<method> to the kernel command line. 446 447 The default behaviour is identical to appending numa=plain to 448 the command line. This will create just one node with all 449 available memory and all CPUs in it. 450 451config NODES_SHIFT 452 int "Maximum NUMA nodes (as a power of 2)" 453 range 1 10 454 depends on NUMA 455 default "4" 456 help 457 Specify the maximum number of NUMA nodes available on the target 458 system. Increases memory reserved to accommodate various tables. 459 460menu "Select NUMA modes" 461 depends on NUMA 462 463config NUMA_EMU 464 bool "NUMA emulation" 465 default y 466 help 467 Numa emulation mode will split the available system memory into 468 equal chunks which then are distributed over the configured number 469 of nodes in a round-robin manner. 470 471 The number of fake nodes is limited by the number of available memory 472 chunks (i.e. memory size / fake size) and the number of supported 473 nodes in the kernel. 474 475 The CPUs are assigned to the nodes in a way that partially respects 476 the original machine topology (if supported by the machine). 477 Fair distribution of the CPUs is not guaranteed. 478 479config EMU_SIZE 480 hex "NUMA emulation memory chunk size" 481 default 0x10000000 482 range 0x400000 0x100000000 483 depends on NUMA_EMU 484 help 485 Select the default size by which the memory is chopped and then 486 assigned to emulated NUMA nodes. 487 488 This can be overridden by specifying 489 490 emu_size=<n> 491 492 on the kernel command line where also suffixes K, M, G, and T are 493 supported. 494 495endmenu 496 497config SCHED_SMT 498 def_bool n 499 500config SCHED_MC 501 def_bool n 502 503config SCHED_BOOK 504 def_bool n 505 506config SCHED_DRAWER 507 def_bool n 508 509config SCHED_TOPOLOGY 510 def_bool y 511 prompt "Topology scheduler support" 512 depends on SMP 513 select SCHED_SMT 514 select SCHED_MC 515 select SCHED_BOOK 516 select SCHED_DRAWER 517 help 518 Topology scheduler support improves the CPU scheduler's decision 519 making when dealing with machines that have multi-threading, 520 multiple cores or multiple books. 521 522source kernel/Kconfig.preempt 523 524source kernel/Kconfig.hz 525 526config ARCH_RANDOM 527 def_bool y 528 prompt "s390 architectural random number generation API" 529 help 530 Enable the s390 architectural random number generation API 531 to provide random data for all consumers within the Linux 532 kernel. 533 534 When enabled the arch_random_* functions declared in linux/random.h 535 are implemented. The implementation is based on the s390 CPACF 536 instruction subfunction TRNG which provides a real true random 537 number generator. 538 539 If unsure, say Y. 540 541config ALTERNATIVES 542 def_bool y 543 prompt "Patch optimized instructions for running CPU type" 544 help 545 When enabled the kernel code is compiled with additional 546 alternative instructions blocks optimized for newer CPU types. 547 These alternative instructions blocks are patched at kernel boot 548 time when running CPU supports them. This mechanism is used to 549 optimize some critical code paths (i.e. spinlocks) for newer CPUs 550 even if kernel is build to support older machine generations. 551 552 This mechanism could be disabled by appending "noaltinstr" 553 option to the kernel command line. 554 555 If unsure, say Y. 556 557endmenu 558 559menu "Memory setup" 560 561config ARCH_SPARSEMEM_ENABLE 562 def_bool y 563 select SPARSEMEM_VMEMMAP_ENABLE 564 select SPARSEMEM_VMEMMAP 565 566config ARCH_SPARSEMEM_DEFAULT 567 def_bool y 568 569config ARCH_SELECT_MEMORY_MODEL 570 def_bool y 571 572config ARCH_ENABLE_MEMORY_HOTPLUG 573 def_bool y if SPARSEMEM 574 575config ARCH_ENABLE_MEMORY_HOTREMOVE 576 def_bool y 577 578config ARCH_ENABLE_SPLIT_PMD_PTLOCK 579 def_bool y 580 581config FORCE_MAX_ZONEORDER 582 int 583 default "9" 584 585source "mm/Kconfig" 586 587config MAX_PHYSMEM_BITS 588 int "Maximum size of supported physical memory in bits (42-53)" 589 range 42 53 590 default "46" 591 help 592 This option specifies the maximum supported size of physical memory 593 in bits. Supported is any size between 2^42 (4TB) and 2^53 (8PB). 594 Increasing the number of bits also increases the kernel image size. 595 By default 46 bits (64TB) are supported. 596 597config PACK_STACK 598 def_bool y 599 prompt "Pack kernel stack" 600 help 601 This option enables the compiler option -mkernel-backchain if it 602 is available. If the option is available the compiler supports 603 the new stack layout which dramatically reduces the minimum stack 604 frame size. With an old compiler a non-leaf function needs a 605 minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With 606 -mkernel-backchain the minimum size drops to 16 byte on 31 bit 607 and 24 byte on 64 bit. 608 609 Say Y if you are unsure. 610 611config CHECK_STACK 612 def_bool y 613 prompt "Detect kernel stack overflow" 614 help 615 This option enables the compiler option -mstack-guard and 616 -mstack-size if they are available. If the compiler supports them 617 it will emit additional code to each function prolog to trigger 618 an illegal operation if the kernel stack is about to overflow. 619 620 Say N if you are unsure. 621 622config STACK_GUARD 623 int "Size of the guard area (128-1024)" 624 range 128 1024 625 depends on CHECK_STACK 626 default "256" 627 help 628 This allows you to specify the size of the guard area at the lower 629 end of the kernel stack. If the kernel stack points into the guard 630 area on function entry an illegal operation is triggered. The size 631 needs to be a power of 2. Please keep in mind that the size of an 632 interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit. 633 The minimum size for the stack guard should be 256 for 31 bit and 634 512 for 64 bit. 635 636config WARN_DYNAMIC_STACK 637 def_bool n 638 prompt "Emit compiler warnings for function with dynamic stack usage" 639 help 640 This option enables the compiler option -mwarn-dynamicstack. If the 641 compiler supports this options generates warnings for functions 642 that dynamically allocate stack space using alloca. 643 644 Say N if you are unsure. 645 646endmenu 647 648menu "I/O subsystem" 649 650config QDIO 651 def_tristate y 652 prompt "QDIO support" 653 ---help--- 654 This driver provides the Queued Direct I/O base support for 655 IBM System z. 656 657 To compile this driver as a module, choose M here: the 658 module will be called qdio. 659 660 If unsure, say Y. 661 662menuconfig PCI 663 bool "PCI support" 664 select PCI_MSI 665 select IOMMU_SUPPORT 666 help 667 Enable PCI support. 668 669if PCI 670 671config PCI_NR_FUNCTIONS 672 int "Maximum number of PCI functions (1-4096)" 673 range 1 4096 674 default "128" 675 help 676 This allows you to specify the maximum number of PCI functions which 677 this kernel will support. 678 679source "drivers/pci/Kconfig" 680 681endif # PCI 682 683config PCI_DOMAINS 684 def_bool PCI 685 686config HAS_IOMEM 687 def_bool PCI 688 689config IOMMU_HELPER 690 def_bool PCI 691 692config NEED_SG_DMA_LENGTH 693 def_bool PCI 694 695config NEED_DMA_MAP_STATE 696 def_bool PCI 697 698config CHSC_SCH 699 def_tristate m 700 prompt "Support for CHSC subchannels" 701 help 702 This driver allows usage of CHSC subchannels. A CHSC subchannel 703 is usually present on LPAR only. 704 The driver creates a device /dev/chsc, which may be used to 705 obtain I/O configuration information about the machine and 706 to issue asynchronous chsc commands (DANGEROUS). 707 You will usually only want to use this interface on a special 708 LPAR designated for system management. 709 710 To compile this driver as a module, choose M here: the 711 module will be called chsc_sch. 712 713 If unsure, say N. 714 715config SCM_BUS 716 def_bool y 717 prompt "SCM bus driver" 718 help 719 Bus driver for Storage Class Memory. 720 721config EADM_SCH 722 def_tristate m 723 prompt "Support for EADM subchannels" 724 depends on SCM_BUS 725 help 726 This driver allows usage of EADM subchannels. EADM subchannels act 727 as a communication vehicle for SCM increments. 728 729 To compile this driver as a module, choose M here: the 730 module will be called eadm_sch. 731 732config VFIO_CCW 733 def_tristate n 734 prompt "Support for VFIO-CCW subchannels" 735 depends on S390_CCW_IOMMU && VFIO_MDEV 736 help 737 This driver allows usage of I/O subchannels via VFIO-CCW. 738 739 To compile this driver as a module, choose M here: the 740 module will be called vfio_ccw. 741 742endmenu 743 744menu "Dump support" 745 746config CRASH_DUMP 747 bool "kernel crash dumps" 748 depends on SMP 749 select KEXEC 750 help 751 Generate crash dump after being started by kexec. 752 Crash dump kernels are loaded in the main kernel with kexec-tools 753 into a specially reserved region and then later executed after 754 a crash by kdump/kexec. 755 Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this. 756 This option also enables s390 zfcpdump. 757 See also <file:Documentation/s390/zfcpdump.txt> 758 759endmenu 760 761menu "Executable file formats / Emulations" 762 763source "fs/Kconfig.binfmt" 764 765config SECCOMP 766 def_bool y 767 prompt "Enable seccomp to safely compute untrusted bytecode" 768 depends on PROC_FS 769 help 770 This kernel feature is useful for number crunching applications 771 that may need to compute untrusted bytecode during their 772 execution. By using pipes or other transports made available to 773 the process as file descriptors supporting the read/write 774 syscalls, it's possible to isolate those applications in 775 their own address space using seccomp. Once seccomp is 776 enabled via /proc/<pid>/seccomp, it cannot be disabled 777 and the task is only allowed to execute a few safe syscalls 778 defined by each seccomp mode. 779 780 If unsure, say Y. 781 782endmenu 783 784menu "Power Management" 785 786config ARCH_HIBERNATION_POSSIBLE 787 def_bool y 788 789source "kernel/power/Kconfig" 790 791endmenu 792 793source "net/Kconfig" 794 795config PCMCIA 796 def_bool n 797 798config CCW 799 def_bool y 800 801source "drivers/Kconfig" 802 803source "fs/Kconfig" 804 805source "arch/s390/Kconfig.debug" 806 807source "security/Kconfig" 808 809source "crypto/Kconfig" 810 811source "lib/Kconfig" 812 813menu "Virtualization" 814 815config PFAULT 816 def_bool y 817 prompt "Pseudo page fault support" 818 help 819 Select this option, if you want to use PFAULT pseudo page fault 820 handling under VM. If running native or in LPAR, this option 821 has no effect. If your VM does not support PFAULT, PAGEEX 822 pseudo page fault handling will be used. 823 Note that VM 4.2 supports PFAULT but has a bug in its 824 implementation that causes some problems. 825 Everybody who wants to run Linux under VM != VM4.2 should select 826 this option. 827 828config CMM 829 def_tristate n 830 prompt "Cooperative memory management" 831 help 832 Select this option, if you want to enable the kernel interface 833 to reduce the memory size of the system. This is accomplished 834 by allocating pages of memory and put them "on hold". This only 835 makes sense for a system running under VM where the unused pages 836 will be reused by VM for other guest systems. The interface 837 allows an external monitor to balance memory of many systems. 838 Everybody who wants to run Linux under VM should select this 839 option. 840 841config CMM_IUCV 842 def_bool y 843 prompt "IUCV special message interface to cooperative memory management" 844 depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV) 845 help 846 Select this option to enable the special message interface to 847 the cooperative memory management. 848 849config APPLDATA_BASE 850 def_bool n 851 prompt "Linux - VM Monitor Stream, base infrastructure" 852 depends on PROC_FS 853 help 854 This provides a kernel interface for creating and updating z/VM APPLDATA 855 monitor records. The monitor records are updated at certain time 856 intervals, once the timer is started. 857 Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer, 858 i.e. enables or disables monitoring on the Linux side. 859 A custom interval value (in seconds) can be written to 860 /proc/appldata/interval. 861 862 Defaults are 60 seconds interval and timer off. 863 The /proc entries can also be read from, showing the current settings. 864 865config APPLDATA_MEM 866 def_tristate m 867 prompt "Monitor memory management statistics" 868 depends on APPLDATA_BASE && VM_EVENT_COUNTERS 869 help 870 This provides memory management related data to the Linux - VM Monitor 871 Stream, like paging/swapping rate, memory utilisation, etc. 872 Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM 873 APPLDATA monitor record, i.e. enables or disables monitoring this record 874 on the z/VM side. 875 876 Default is disabled. 877 The /proc entry can also be read from, showing the current settings. 878 879 This can also be compiled as a module, which will be called 880 appldata_mem.o. 881 882config APPLDATA_OS 883 def_tristate m 884 prompt "Monitor OS statistics" 885 depends on APPLDATA_BASE 886 help 887 This provides OS related data to the Linux - VM Monitor Stream, like 888 CPU utilisation, etc. 889 Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM 890 APPLDATA monitor record, i.e. enables or disables monitoring this record 891 on the z/VM side. 892 893 Default is disabled. 894 This can also be compiled as a module, which will be called 895 appldata_os.o. 896 897config APPLDATA_NET_SUM 898 def_tristate m 899 prompt "Monitor overall network statistics" 900 depends on APPLDATA_BASE && NET 901 help 902 This provides network related data to the Linux - VM Monitor Stream, 903 currently there is only a total sum of network I/O statistics, no 904 per-interface data. 905 Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM 906 APPLDATA monitor record, i.e. enables or disables monitoring this record 907 on the z/VM side. 908 909 Default is disabled. 910 This can also be compiled as a module, which will be called 911 appldata_net_sum.o. 912 913config S390_HYPFS_FS 914 def_bool y 915 prompt "s390 hypervisor file system support" 916 select SYS_HYPERVISOR 917 help 918 This is a virtual file system intended to provide accounting 919 information in an s390 hypervisor environment. 920 921source "arch/s390/kvm/Kconfig" 922 923config S390_GUEST 924 def_bool y 925 prompt "s390 support for virtio devices" 926 select TTY 927 select VIRTUALIZATION 928 select VIRTIO 929 select VIRTIO_CONSOLE 930 help 931 Enabling this option adds support for virtio based paravirtual device 932 drivers on s390. 933 934 Select this option if you want to run the kernel as a guest under 935 the KVM hypervisor. 936 937endmenu 938