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 GENERIC_LOCKBREAK 39 def_bool y if SMP && PREEMPT 40 41config PGSTE 42 def_bool y if KVM 43 44config ARCH_SUPPORTS_DEBUG_PAGEALLOC 45 def_bool y 46 47config AUDIT_ARCH 48 def_bool y 49 50config NO_IOPORT_MAP 51 def_bool y 52 53config PCI_QUIRKS 54 def_bool n 55 56config ARCH_SUPPORTS_UPROBES 57 def_bool y 58 59config KASAN_SHADOW_OFFSET 60 hex 61 depends on KASAN 62 default 0x18000000000000 if KASAN_S390_4_LEVEL_PAGING 63 default 0x30000000000 64 65config S390 66 def_bool y 67 select ARCH_BINFMT_ELF_STATE 68 select ARCH_HAS_DEVMEM_IS_ALLOWED 69 select ARCH_HAS_ELF_RANDOMIZE 70 select ARCH_HAS_FORTIFY_SOURCE 71 select ARCH_HAS_GCOV_PROFILE_ALL 72 select ARCH_HAS_GIGANTIC_PAGE if (MEMORY_ISOLATION && COMPACTION) || CMA 73 select ARCH_HAS_KCOV 74 select ARCH_HAS_PTE_SPECIAL 75 select ARCH_HAS_SET_MEMORY 76 select ARCH_HAS_STRICT_KERNEL_RWX 77 select ARCH_HAS_STRICT_MODULE_RWX 78 select ARCH_HAS_UBSAN_SANITIZE_ALL 79 select ARCH_HAVE_NMI_SAFE_CMPXCHG 80 select ARCH_INLINE_READ_LOCK 81 select ARCH_INLINE_READ_LOCK_BH 82 select ARCH_INLINE_READ_LOCK_IRQ 83 select ARCH_INLINE_READ_LOCK_IRQSAVE 84 select ARCH_INLINE_READ_TRYLOCK 85 select ARCH_INLINE_READ_UNLOCK 86 select ARCH_INLINE_READ_UNLOCK_BH 87 select ARCH_INLINE_READ_UNLOCK_IRQ 88 select ARCH_INLINE_READ_UNLOCK_IRQRESTORE 89 select ARCH_INLINE_SPIN_LOCK 90 select ARCH_INLINE_SPIN_LOCK_BH 91 select ARCH_INLINE_SPIN_LOCK_IRQ 92 select ARCH_INLINE_SPIN_LOCK_IRQSAVE 93 select ARCH_INLINE_SPIN_TRYLOCK 94 select ARCH_INLINE_SPIN_TRYLOCK_BH 95 select ARCH_INLINE_SPIN_UNLOCK 96 select ARCH_INLINE_SPIN_UNLOCK_BH 97 select ARCH_INLINE_SPIN_UNLOCK_IRQ 98 select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE 99 select ARCH_INLINE_WRITE_LOCK 100 select ARCH_INLINE_WRITE_LOCK_BH 101 select ARCH_INLINE_WRITE_LOCK_IRQ 102 select ARCH_INLINE_WRITE_LOCK_IRQSAVE 103 select ARCH_INLINE_WRITE_TRYLOCK 104 select ARCH_INLINE_WRITE_UNLOCK 105 select ARCH_INLINE_WRITE_UNLOCK_BH 106 select ARCH_INLINE_WRITE_UNLOCK_IRQ 107 select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE 108 select ARCH_SAVE_PAGE_KEYS if HIBERNATION 109 select ARCH_SUPPORTS_ATOMIC_RMW 110 select ARCH_SUPPORTS_NUMA_BALANCING 111 select ARCH_USE_BUILTIN_BSWAP 112 select ARCH_USE_CMPXCHG_LOCKREF 113 select ARCH_WANTS_DYNAMIC_TASK_STRUCT 114 select ARCH_WANT_IPC_PARSE_VERSION 115 select BUILDTIME_EXTABLE_SORT 116 select CLONE_BACKWARDS2 117 select DYNAMIC_FTRACE if FUNCTION_TRACER 118 select GENERIC_CLOCKEVENTS 119 select GENERIC_CPU_AUTOPROBE 120 select GENERIC_CPU_DEVICES if !SMP 121 select GENERIC_CPU_VULNERABILITIES 122 select GENERIC_FIND_FIRST_BIT 123 select GENERIC_SMP_IDLE_THREAD 124 select GENERIC_TIME_VSYSCALL 125 select HAVE_ALIGNED_STRUCT_PAGE if SLUB 126 select HAVE_ARCH_AUDITSYSCALL 127 select HAVE_ARCH_JUMP_LABEL 128 select HAVE_ARCH_JUMP_LABEL_RELATIVE 129 select HAVE_ARCH_KASAN 130 select CPU_NO_EFFICIENT_FFS if !HAVE_MARCH_Z9_109_FEATURES 131 select HAVE_ARCH_SECCOMP_FILTER 132 select HAVE_ARCH_SOFT_DIRTY 133 select HAVE_ARCH_TRACEHOOK 134 select HAVE_ARCH_TRANSPARENT_HUGEPAGE 135 select HAVE_ARCH_VMAP_STACK 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_CONTIGUOUS 142 select HAVE_DYNAMIC_FTRACE 143 select HAVE_DYNAMIC_FTRACE_WITH_REGS 144 select HAVE_EFFICIENT_UNALIGNED_ACCESS 145 select HAVE_FENTRY 146 select HAVE_FTRACE_MCOUNT_RECORD 147 select HAVE_FUNCTION_GRAPH_TRACER 148 select HAVE_FUNCTION_TRACER 149 select HAVE_FUTEX_CMPXCHG if FUTEX 150 select HAVE_GCC_PLUGINS 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_UNCOMPRESSED 157 select HAVE_KERNEL_XZ 158 select HAVE_KPROBES 159 select HAVE_KRETPROBES 160 select HAVE_KVM 161 select HAVE_LIVEPATCH 162 select HAVE_PERF_REGS 163 select HAVE_PERF_USER_STACK_DUMP 164 select HAVE_MEMBLOCK_NODE_MAP 165 select HAVE_MEMBLOCK_PHYS_MAP 166 select HAVE_MOD_ARCH_SPECIFIC 167 select HAVE_NOP_MCOUNT 168 select HAVE_OPROFILE 169 select HAVE_PCI 170 select HAVE_PERF_EVENTS 171 select HAVE_REGS_AND_STACK_ACCESS_API 172 select HAVE_RSEQ 173 select HAVE_SYSCALL_TRACEPOINTS 174 select HAVE_VIRT_CPU_ACCOUNTING 175 select IOMMU_HELPER if PCI 176 select IOMMU_SUPPORT if PCI 177 select MODULES_USE_ELF_RELA 178 select NEED_DMA_MAP_STATE if PCI 179 select NEED_SG_DMA_LENGTH if PCI 180 select OLD_SIGACTION 181 select OLD_SIGSUSPEND3 182 select PCI_DOMAINS if PCI 183 select PCI_MSI if PCI 184 select SPARSE_IRQ 185 select SYSCTL_EXCEPTION_TRACE 186 select THREAD_INFO_IN_TASK 187 select TTY 188 select VIRT_CPU_ACCOUNTING 189 select ARCH_HAS_SCALED_CPUTIME 190 select VIRT_TO_BUS 191 select HAVE_NMI 192 193 194config SCHED_OMIT_FRAME_POINTER 195 def_bool y 196 197config PGTABLE_LEVELS 198 int 199 default 5 200 201source "kernel/livepatch/Kconfig" 202 203menu "Processor type and features" 204 205config HAVE_MARCH_Z900_FEATURES 206 def_bool n 207 208config HAVE_MARCH_Z990_FEATURES 209 def_bool n 210 select HAVE_MARCH_Z900_FEATURES 211 212config HAVE_MARCH_Z9_109_FEATURES 213 def_bool n 214 select HAVE_MARCH_Z990_FEATURES 215 216config HAVE_MARCH_Z10_FEATURES 217 def_bool n 218 select HAVE_MARCH_Z9_109_FEATURES 219 220config HAVE_MARCH_Z196_FEATURES 221 def_bool n 222 select HAVE_MARCH_Z10_FEATURES 223 224config HAVE_MARCH_ZEC12_FEATURES 225 def_bool n 226 select HAVE_MARCH_Z196_FEATURES 227 228config HAVE_MARCH_Z13_FEATURES 229 def_bool n 230 select HAVE_MARCH_ZEC12_FEATURES 231 232config HAVE_MARCH_Z14_FEATURES 233 def_bool n 234 select HAVE_MARCH_Z13_FEATURES 235 236choice 237 prompt "Processor type" 238 default MARCH_Z196 239 240config MARCH_Z900 241 bool "IBM zSeries model z800 and z900" 242 select HAVE_MARCH_Z900_FEATURES 243 help 244 Select this to enable optimizations for model z800/z900 (2064 and 245 2066 series). This will enable some optimizations that are not 246 available on older ESA/390 (31 Bit) only CPUs. 247 248config MARCH_Z990 249 bool "IBM zSeries model z890 and z990" 250 select HAVE_MARCH_Z990_FEATURES 251 help 252 Select this to enable optimizations for model z890/z990 (2084 and 253 2086 series). The kernel will be slightly faster but will not work 254 on older machines. 255 256config MARCH_Z9_109 257 bool "IBM System z9" 258 select HAVE_MARCH_Z9_109_FEATURES 259 help 260 Select this to enable optimizations for IBM System z9 (2094 and 261 2096 series). The kernel will be slightly faster but will not work 262 on older machines. 263 264config MARCH_Z10 265 bool "IBM System z10" 266 select HAVE_MARCH_Z10_FEATURES 267 help 268 Select this to enable optimizations for IBM System z10 (2097 and 269 2098 series). The kernel will be slightly faster but will not work 270 on older machines. 271 272config MARCH_Z196 273 bool "IBM zEnterprise 114 and 196" 274 select HAVE_MARCH_Z196_FEATURES 275 help 276 Select this to enable optimizations for IBM zEnterprise 114 and 196 277 (2818 and 2817 series). The kernel will be slightly faster but will 278 not work on older machines. 279 280config MARCH_ZEC12 281 bool "IBM zBC12 and zEC12" 282 select HAVE_MARCH_ZEC12_FEATURES 283 help 284 Select this to enable optimizations for IBM zBC12 and zEC12 (2828 and 285 2827 series). The kernel will be slightly faster but will not work on 286 older machines. 287 288config MARCH_Z13 289 bool "IBM z13s and z13" 290 select HAVE_MARCH_Z13_FEATURES 291 help 292 Select this to enable optimizations for IBM z13s and z13 (2965 and 293 2964 series). The kernel will be slightly faster but will not work on 294 older machines. 295 296config MARCH_Z14 297 bool "IBM z14 ZR1 and z14" 298 select HAVE_MARCH_Z14_FEATURES 299 help 300 Select this to enable optimizations for IBM z14 ZR1 and z14 (3907 301 and 3906 series). The kernel will be slightly faster but will not 302 work on older machines. 303 304endchoice 305 306config MARCH_Z900_TUNE 307 def_bool TUNE_Z900 || MARCH_Z900 && TUNE_DEFAULT 308 309config MARCH_Z990_TUNE 310 def_bool TUNE_Z990 || MARCH_Z990 && TUNE_DEFAULT 311 312config MARCH_Z9_109_TUNE 313 def_bool TUNE_Z9_109 || MARCH_Z9_109 && TUNE_DEFAULT 314 315config MARCH_Z10_TUNE 316 def_bool TUNE_Z10 || MARCH_Z10 && TUNE_DEFAULT 317 318config MARCH_Z196_TUNE 319 def_bool TUNE_Z196 || MARCH_Z196 && TUNE_DEFAULT 320 321config MARCH_ZEC12_TUNE 322 def_bool TUNE_ZEC12 || MARCH_ZEC12 && TUNE_DEFAULT 323 324config MARCH_Z13_TUNE 325 def_bool TUNE_Z13 || MARCH_Z13 && TUNE_DEFAULT 326 327config MARCH_Z14_TUNE 328 def_bool TUNE_Z14 || MARCH_Z14 && TUNE_DEFAULT 329 330choice 331 prompt "Tune code generation" 332 default TUNE_DEFAULT 333 help 334 Cause the compiler to tune (-mtune) the generated code for a machine. 335 This will make the code run faster on the selected machine but 336 somewhat slower on other machines. 337 This option only changes how the compiler emits instructions, not the 338 selection of instructions itself, so the resulting kernel will run on 339 all other machines. 340 341config TUNE_DEFAULT 342 bool "Default" 343 help 344 Tune the generated code for the target processor for which the kernel 345 will be compiled. 346 347config TUNE_Z900 348 bool "IBM zSeries model z800 and z900" 349 350config TUNE_Z990 351 bool "IBM zSeries model z890 and z990" 352 353config TUNE_Z9_109 354 bool "IBM System z9" 355 356config TUNE_Z10 357 bool "IBM System z10" 358 359config TUNE_Z196 360 bool "IBM zEnterprise 114 and 196" 361 362config TUNE_ZEC12 363 bool "IBM zBC12 and zEC12" 364 365config TUNE_Z13 366 bool "IBM z13" 367 368config TUNE_Z14 369 bool "IBM z14" 370 371endchoice 372 373config 64BIT 374 def_bool y 375 376config COMPAT 377 def_bool y 378 prompt "Kernel support for 31 bit emulation" 379 select COMPAT_BINFMT_ELF if BINFMT_ELF 380 select ARCH_WANT_OLD_COMPAT_IPC 381 select COMPAT_OLD_SIGACTION 382 depends on MULTIUSER 383 help 384 Select this option if you want to enable your system kernel to 385 handle system-calls from ELF binaries for 31 bit ESA. This option 386 (and some other stuff like libraries and such) is needed for 387 executing 31 bit applications. It is safe to say "Y". 388 389config SYSVIPC_COMPAT 390 def_bool y if COMPAT && SYSVIPC 391 392config SMP 393 def_bool y 394 prompt "Symmetric multi-processing support" 395 ---help--- 396 This enables support for systems with more than one CPU. If you have 397 a system with only one CPU, like most personal computers, say N. If 398 you have a system with more than one CPU, say Y. 399 400 If you say N here, the kernel will run on uni- and multiprocessor 401 machines, but will use only one CPU of a multiprocessor machine. If 402 you say Y here, the kernel will run on many, but not all, 403 uniprocessor machines. On a uniprocessor machine, the kernel 404 will run faster if you say N here. 405 406 See also the SMP-HOWTO available at 407 <http://www.tldp.org/docs.html#howto>. 408 409 Even if you don't know what to do here, say Y. 410 411config NR_CPUS 412 int "Maximum number of CPUs (2-512)" 413 range 2 512 414 depends on SMP 415 default "64" 416 help 417 This allows you to specify the maximum number of CPUs which this 418 kernel will support. The maximum supported value is 512 and the 419 minimum value which makes sense is 2. 420 421 This is purely to save memory - each supported CPU adds 422 approximately sixteen kilobytes to the kernel image. 423 424config HOTPLUG_CPU 425 def_bool y 426 prompt "Support for hot-pluggable CPUs" 427 depends on SMP 428 help 429 Say Y here to be able to turn CPUs off and on. CPUs 430 can be controlled through /sys/devices/system/cpu/cpu#. 431 Say N if you want to disable CPU hotplug. 432 433# Some NUMA nodes have memory ranges that span 434# other nodes. Even though a pfn is valid and 435# between a node's start and end pfns, it may not 436# reside on that node. See memmap_init_zone() 437# for details. <- They meant memory holes! 438config NODES_SPAN_OTHER_NODES 439 def_bool NUMA 440 441config NUMA 442 bool "NUMA support" 443 depends on SMP && SCHED_TOPOLOGY 444 default n 445 help 446 Enable NUMA support 447 448 This option adds NUMA support to the kernel. 449 450 An operation mode can be selected by appending 451 numa=<method> to the kernel command line. 452 453 The default behaviour is identical to appending numa=plain to 454 the command line. This will create just one node with all 455 available memory and all CPUs in it. 456 457config NODES_SHIFT 458 int "Maximum NUMA nodes (as a power of 2)" 459 range 1 10 460 depends on NUMA 461 default "4" 462 help 463 Specify the maximum number of NUMA nodes available on the target 464 system. Increases memory reserved to accommodate various tables. 465 466menu "Select NUMA modes" 467 depends on NUMA 468 469config NUMA_EMU 470 bool "NUMA emulation" 471 default y 472 help 473 Numa emulation mode will split the available system memory into 474 equal chunks which then are distributed over the configured number 475 of nodes in a round-robin manner. 476 477 The number of fake nodes is limited by the number of available memory 478 chunks (i.e. memory size / fake size) and the number of supported 479 nodes in the kernel. 480 481 The CPUs are assigned to the nodes in a way that partially respects 482 the original machine topology (if supported by the machine). 483 Fair distribution of the CPUs is not guaranteed. 484 485config EMU_SIZE 486 hex "NUMA emulation memory chunk size" 487 default 0x10000000 488 range 0x400000 0x100000000 489 depends on NUMA_EMU 490 help 491 Select the default size by which the memory is chopped and then 492 assigned to emulated NUMA nodes. 493 494 This can be overridden by specifying 495 496 emu_size=<n> 497 498 on the kernel command line where also suffixes K, M, G, and T are 499 supported. 500 501endmenu 502 503config SCHED_SMT 504 def_bool n 505 506config SCHED_MC 507 def_bool n 508 509config SCHED_BOOK 510 def_bool n 511 512config SCHED_DRAWER 513 def_bool n 514 515config SCHED_TOPOLOGY 516 def_bool y 517 prompt "Topology scheduler support" 518 depends on SMP 519 select SCHED_SMT 520 select SCHED_MC 521 select SCHED_BOOK 522 select SCHED_DRAWER 523 help 524 Topology scheduler support improves the CPU scheduler's decision 525 making when dealing with machines that have multi-threading, 526 multiple cores or multiple books. 527 528source "kernel/Kconfig.hz" 529 530config KEXEC 531 def_bool y 532 select KEXEC_CORE 533 534config KEXEC_FILE 535 bool "kexec file based system call" 536 select KEXEC_CORE 537 select BUILD_BIN2C 538 depends on CRYPTO 539 depends on CRYPTO_SHA256 540 depends on CRYPTO_SHA256_S390 541 help 542 Enable the kexec file based system call. In contrast to the normal 543 kexec system call this system call takes file descriptors for the 544 kernel and initramfs as arguments. 545 546config ARCH_HAS_KEXEC_PURGATORY 547 def_bool y 548 depends on KEXEC_FILE 549 550config ARCH_RANDOM 551 def_bool y 552 prompt "s390 architectural random number generation API" 553 help 554 Enable the s390 architectural random number generation API 555 to provide random data for all consumers within the Linux 556 kernel. 557 558 When enabled the arch_random_* functions declared in linux/random.h 559 are implemented. The implementation is based on the s390 CPACF 560 instruction subfunction TRNG which provides a real true random 561 number generator. 562 563 If unsure, say Y. 564 565config KERNEL_NOBP 566 def_bool n 567 prompt "Enable modified branch prediction for the kernel by default" 568 help 569 If this option is selected the kernel will switch to a modified 570 branch prediction mode if the firmware interface is available. 571 The modified branch prediction mode improves the behaviour in 572 regard to speculative execution. 573 574 With the option enabled the kernel parameter "nobp=0" or "nospec" 575 can be used to run the kernel in the normal branch prediction mode. 576 577 With the option disabled the modified branch prediction mode is 578 enabled with the "nobp=1" kernel parameter. 579 580 If unsure, say N. 581 582config EXPOLINE 583 def_bool n 584 prompt "Avoid speculative indirect branches in the kernel" 585 help 586 Compile the kernel with the expoline compiler options to guard 587 against kernel-to-user data leaks by avoiding speculative indirect 588 branches. 589 Requires a compiler with -mindirect-branch=thunk support for full 590 protection. The kernel may run slower. 591 592 If unsure, say N. 593 594choice 595 prompt "Expoline default" 596 depends on EXPOLINE 597 default EXPOLINE_FULL 598 599config EXPOLINE_OFF 600 bool "spectre_v2=off" 601 602config EXPOLINE_AUTO 603 bool "spectre_v2=auto" 604 605config EXPOLINE_FULL 606 bool "spectre_v2=on" 607 608endchoice 609 610endmenu 611 612menu "Memory setup" 613 614config ARCH_SPARSEMEM_ENABLE 615 def_bool y 616 select SPARSEMEM_VMEMMAP_ENABLE 617 select SPARSEMEM_VMEMMAP 618 619config ARCH_SPARSEMEM_DEFAULT 620 def_bool y 621 622config ARCH_SELECT_MEMORY_MODEL 623 def_bool y 624 625config ARCH_ENABLE_MEMORY_HOTPLUG 626 def_bool y if SPARSEMEM 627 628config ARCH_ENABLE_MEMORY_HOTREMOVE 629 def_bool y 630 631config ARCH_ENABLE_SPLIT_PMD_PTLOCK 632 def_bool y 633 634config FORCE_MAX_ZONEORDER 635 int 636 default "9" 637 638config MAX_PHYSMEM_BITS 639 int "Maximum size of supported physical memory in bits (42-53)" 640 range 42 53 641 default "46" 642 help 643 This option specifies the maximum supported size of physical memory 644 in bits. Supported is any size between 2^42 (4TB) and 2^53 (8PB). 645 Increasing the number of bits also increases the kernel image size. 646 By default 46 bits (64TB) are supported. 647 648config PACK_STACK 649 def_bool y 650 prompt "Pack kernel stack" 651 help 652 This option enables the compiler option -mkernel-backchain if it 653 is available. If the option is available the compiler supports 654 the new stack layout which dramatically reduces the minimum stack 655 frame size. With an old compiler a non-leaf function needs a 656 minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With 657 -mkernel-backchain the minimum size drops to 16 byte on 31 bit 658 and 24 byte on 64 bit. 659 660 Say Y if you are unsure. 661 662config CHECK_STACK 663 def_bool y 664 depends on !VMAP_STACK 665 prompt "Detect kernel stack overflow" 666 help 667 This option enables the compiler option -mstack-guard and 668 -mstack-size if they are available. If the compiler supports them 669 it will emit additional code to each function prolog to trigger 670 an illegal operation if the kernel stack is about to overflow. 671 672 Say N if you are unsure. 673 674config STACK_GUARD 675 int "Size of the guard area (128-1024)" 676 range 128 1024 677 depends on CHECK_STACK 678 default "256" 679 help 680 This allows you to specify the size of the guard area at the lower 681 end of the kernel stack. If the kernel stack points into the guard 682 area on function entry an illegal operation is triggered. The size 683 needs to be a power of 2. Please keep in mind that the size of an 684 interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit. 685 The minimum size for the stack guard should be 256 for 31 bit and 686 512 for 64 bit. 687 688config WARN_DYNAMIC_STACK 689 def_bool n 690 prompt "Emit compiler warnings for function with dynamic stack usage" 691 help 692 This option enables the compiler option -mwarn-dynamicstack. If the 693 compiler supports this options generates warnings for functions 694 that dynamically allocate stack space using alloca. 695 696 Say N if you are unsure. 697 698endmenu 699 700menu "I/O subsystem" 701 702config QDIO 703 def_tristate y 704 prompt "QDIO support" 705 ---help--- 706 This driver provides the Queued Direct I/O base support for 707 IBM System z. 708 709 To compile this driver as a module, choose M here: the 710 module will be called qdio. 711 712 If unsure, say Y. 713 714if PCI 715 716config PCI_NR_FUNCTIONS 717 int "Maximum number of PCI functions (1-4096)" 718 range 1 4096 719 default "128" 720 help 721 This allows you to specify the maximum number of PCI functions which 722 this kernel will support. 723 724endif # PCI 725 726config HAS_IOMEM 727 def_bool PCI 728 729config CHSC_SCH 730 def_tristate m 731 prompt "Support for CHSC subchannels" 732 help 733 This driver allows usage of CHSC subchannels. A CHSC subchannel 734 is usually present on LPAR only. 735 The driver creates a device /dev/chsc, which may be used to 736 obtain I/O configuration information about the machine and 737 to issue asynchronous chsc commands (DANGEROUS). 738 You will usually only want to use this interface on a special 739 LPAR designated for system management. 740 741 To compile this driver as a module, choose M here: the 742 module will be called chsc_sch. 743 744 If unsure, say N. 745 746config SCM_BUS 747 def_bool y 748 prompt "SCM bus driver" 749 help 750 Bus driver for Storage Class Memory. 751 752config EADM_SCH 753 def_tristate m 754 prompt "Support for EADM subchannels" 755 depends on SCM_BUS 756 help 757 This driver allows usage of EADM subchannels. EADM subchannels act 758 as a communication vehicle for SCM increments. 759 760 To compile this driver as a module, choose M here: the 761 module will be called eadm_sch. 762 763config VFIO_CCW 764 def_tristate n 765 prompt "Support for VFIO-CCW subchannels" 766 depends on S390_CCW_IOMMU && VFIO_MDEV 767 help 768 This driver allows usage of I/O subchannels via VFIO-CCW. 769 770 To compile this driver as a module, choose M here: the 771 module will be called vfio_ccw. 772 773config VFIO_AP 774 def_tristate n 775 prompt "VFIO support for AP devices" 776 depends on S390_AP_IOMMU && VFIO_MDEV_DEVICE && KVM 777 help 778 This driver grants access to Adjunct Processor (AP) devices 779 via the VFIO mediated device interface. 780 781 To compile this driver as a module, choose M here: the module 782 will be called vfio_ap. 783 784endmenu 785 786menu "Dump support" 787 788config CRASH_DUMP 789 bool "kernel crash dumps" 790 depends on SMP 791 select KEXEC 792 help 793 Generate crash dump after being started by kexec. 794 Crash dump kernels are loaded in the main kernel with kexec-tools 795 into a specially reserved region and then later executed after 796 a crash by kdump/kexec. 797 Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this. 798 This option also enables s390 zfcpdump. 799 See also <file:Documentation/s390/zfcpdump.txt> 800 801endmenu 802 803config SECCOMP 804 def_bool y 805 prompt "Enable seccomp to safely compute untrusted bytecode" 806 depends on PROC_FS 807 help 808 This kernel feature is useful for number crunching applications 809 that may need to compute untrusted bytecode during their 810 execution. By using pipes or other transports made available to 811 the process as file descriptors supporting the read/write 812 syscalls, it's possible to isolate those applications in 813 their own address space using seccomp. Once seccomp is 814 enabled via /proc/<pid>/seccomp, it cannot be disabled 815 and the task is only allowed to execute a few safe syscalls 816 defined by each seccomp mode. 817 818 If unsure, say Y. 819 820menu "Power Management" 821 822config ARCH_HIBERNATION_POSSIBLE 823 def_bool y 824 825source "kernel/power/Kconfig" 826 827endmenu 828 829config CCW 830 def_bool y 831 832config HAVE_PNETID 833 tristate 834 default (SMC || CCWGROUP) 835 836menu "Virtualization" 837 838config PFAULT 839 def_bool y 840 prompt "Pseudo page fault support" 841 help 842 Select this option, if you want to use PFAULT pseudo page fault 843 handling under VM. If running native or in LPAR, this option 844 has no effect. If your VM does not support PFAULT, PAGEEX 845 pseudo page fault handling will be used. 846 Note that VM 4.2 supports PFAULT but has a bug in its 847 implementation that causes some problems. 848 Everybody who wants to run Linux under VM != VM4.2 should select 849 this option. 850 851config CMM 852 def_tristate n 853 prompt "Cooperative memory management" 854 help 855 Select this option, if you want to enable the kernel interface 856 to reduce the memory size of the system. This is accomplished 857 by allocating pages of memory and put them "on hold". This only 858 makes sense for a system running under VM where the unused pages 859 will be reused by VM for other guest systems. The interface 860 allows an external monitor to balance memory of many systems. 861 Everybody who wants to run Linux under VM should select this 862 option. 863 864config CMM_IUCV 865 def_bool y 866 prompt "IUCV special message interface to cooperative memory management" 867 depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV) 868 help 869 Select this option to enable the special message interface to 870 the cooperative memory management. 871 872config APPLDATA_BASE 873 def_bool n 874 prompt "Linux - VM Monitor Stream, base infrastructure" 875 depends on PROC_FS 876 help 877 This provides a kernel interface for creating and updating z/VM APPLDATA 878 monitor records. The monitor records are updated at certain time 879 intervals, once the timer is started. 880 Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer, 881 i.e. enables or disables monitoring on the Linux side. 882 A custom interval value (in seconds) can be written to 883 /proc/appldata/interval. 884 885 Defaults are 60 seconds interval and timer off. 886 The /proc entries can also be read from, showing the current settings. 887 888config APPLDATA_MEM 889 def_tristate m 890 prompt "Monitor memory management statistics" 891 depends on APPLDATA_BASE && VM_EVENT_COUNTERS 892 help 893 This provides memory management related data to the Linux - VM Monitor 894 Stream, like paging/swapping rate, memory utilisation, etc. 895 Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM 896 APPLDATA monitor record, i.e. enables or disables monitoring this record 897 on the z/VM side. 898 899 Default is disabled. 900 The /proc entry can also be read from, showing the current settings. 901 902 This can also be compiled as a module, which will be called 903 appldata_mem.o. 904 905config APPLDATA_OS 906 def_tristate m 907 prompt "Monitor OS statistics" 908 depends on APPLDATA_BASE 909 help 910 This provides OS related data to the Linux - VM Monitor Stream, like 911 CPU utilisation, etc. 912 Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM 913 APPLDATA monitor record, i.e. enables or disables monitoring this record 914 on the z/VM side. 915 916 Default is disabled. 917 This can also be compiled as a module, which will be called 918 appldata_os.o. 919 920config APPLDATA_NET_SUM 921 def_tristate m 922 prompt "Monitor overall network statistics" 923 depends on APPLDATA_BASE && NET 924 help 925 This provides network related data to the Linux - VM Monitor Stream, 926 currently there is only a total sum of network I/O statistics, no 927 per-interface data. 928 Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM 929 APPLDATA monitor record, i.e. enables or disables monitoring this record 930 on the z/VM side. 931 932 Default is disabled. 933 This can also be compiled as a module, which will be called 934 appldata_net_sum.o. 935 936config S390_HYPFS_FS 937 def_bool y 938 prompt "s390 hypervisor file system support" 939 select SYS_HYPERVISOR 940 help 941 This is a virtual file system intended to provide accounting 942 information in an s390 hypervisor environment. 943 944source "arch/s390/kvm/Kconfig" 945 946config S390_GUEST 947 def_bool y 948 prompt "s390 support for virtio devices" 949 select TTY 950 select VIRTUALIZATION 951 select VIRTIO 952 select VIRTIO_CONSOLE 953 help 954 Enabling this option adds support for virtio based paravirtual device 955 drivers on s390. 956 957 Select this option if you want to run the kernel as a guest under 958 the KVM hypervisor. 959 960endmenu 961