1# SPDX-License-Identifier: GPL-2.0 2config MMU 3 def_bool y 4 5config CPU_BIG_ENDIAN 6 def_bool y 7 8config LOCKDEP_SUPPORT 9 def_bool y 10 11config STACKTRACE_SUPPORT 12 def_bool y 13 14config ARCH_HAS_ILOG2_U32 15 def_bool n 16 17config ARCH_HAS_ILOG2_U64 18 def_bool n 19 20config GENERIC_HWEIGHT 21 def_bool y 22 23config GENERIC_BUG 24 def_bool y if BUG 25 26config GENERIC_BUG_RELATIVE_POINTERS 27 def_bool y 28 29config GENERIC_CSUM 30 bool 31 default y if KASAN 32 33config GENERIC_LOCKBREAK 34 def_bool y if PREEMPTION 35 36config PGSTE 37 def_bool y if KVM 38 39config AUDIT_ARCH 40 def_bool y 41 42config NO_IOPORT_MAP 43 def_bool y 44 45config PCI_QUIRKS 46 def_bool n 47 48config ARCH_SUPPORTS_UPROBES 49 def_bool y 50 51config KASAN_SHADOW_OFFSET 52 hex 53 depends on KASAN 54 default 0x1C000000000000 55 56config S390 57 def_bool y 58 # 59 # Note: keep this list sorted alphabetically 60 # 61 imply IMA_SECURE_AND_OR_TRUSTED_BOOT 62 select ALTERNATE_USER_ADDRESS_SPACE 63 select ARCH_32BIT_USTAT_F_TINODE 64 select ARCH_BINFMT_ELF_STATE 65 select ARCH_CORRECT_STACKTRACE_ON_KRETPROBE 66 select ARCH_ENABLE_MEMORY_HOTPLUG if SPARSEMEM 67 select ARCH_ENABLE_MEMORY_HOTREMOVE 68 select ARCH_ENABLE_SPLIT_PMD_PTLOCK if PGTABLE_LEVELS > 2 69 select ARCH_HAS_CURRENT_STACK_POINTER 70 select ARCH_HAS_DEBUG_VM_PGTABLE 71 select ARCH_HAS_DEBUG_WX 72 select ARCH_HAS_DEVMEM_IS_ALLOWED 73 select ARCH_HAS_ELF_RANDOMIZE 74 select ARCH_HAS_FORCE_DMA_UNENCRYPTED 75 select ARCH_HAS_FORTIFY_SOURCE 76 select ARCH_HAS_GCOV_PROFILE_ALL 77 select ARCH_HAS_GIGANTIC_PAGE 78 select ARCH_HAS_KCOV 79 select ARCH_HAS_MEM_ENCRYPT 80 select ARCH_HAS_NMI_SAFE_THIS_CPU_OPS 81 select ARCH_HAS_PTE_SPECIAL 82 select ARCH_HAS_SCALED_CPUTIME 83 select ARCH_HAS_SET_MEMORY 84 select ARCH_HAS_STRICT_KERNEL_RWX 85 select ARCH_HAS_STRICT_MODULE_RWX 86 select ARCH_HAS_SYSCALL_WRAPPER 87 select ARCH_HAS_UBSAN_SANITIZE_ALL 88 select ARCH_HAS_VDSO_DATA 89 select ARCH_HAVE_NMI_SAFE_CMPXCHG 90 select ARCH_INLINE_READ_LOCK 91 select ARCH_INLINE_READ_LOCK_BH 92 select ARCH_INLINE_READ_LOCK_IRQ 93 select ARCH_INLINE_READ_LOCK_IRQSAVE 94 select ARCH_INLINE_READ_TRYLOCK 95 select ARCH_INLINE_READ_UNLOCK 96 select ARCH_INLINE_READ_UNLOCK_BH 97 select ARCH_INLINE_READ_UNLOCK_IRQ 98 select ARCH_INLINE_READ_UNLOCK_IRQRESTORE 99 select ARCH_INLINE_SPIN_LOCK 100 select ARCH_INLINE_SPIN_LOCK_BH 101 select ARCH_INLINE_SPIN_LOCK_IRQ 102 select ARCH_INLINE_SPIN_LOCK_IRQSAVE 103 select ARCH_INLINE_SPIN_TRYLOCK 104 select ARCH_INLINE_SPIN_TRYLOCK_BH 105 select ARCH_INLINE_SPIN_UNLOCK 106 select ARCH_INLINE_SPIN_UNLOCK_BH 107 select ARCH_INLINE_SPIN_UNLOCK_IRQ 108 select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE 109 select ARCH_INLINE_WRITE_LOCK 110 select ARCH_INLINE_WRITE_LOCK_BH 111 select ARCH_INLINE_WRITE_LOCK_IRQ 112 select ARCH_INLINE_WRITE_LOCK_IRQSAVE 113 select ARCH_INLINE_WRITE_TRYLOCK 114 select ARCH_INLINE_WRITE_UNLOCK 115 select ARCH_INLINE_WRITE_UNLOCK_BH 116 select ARCH_INLINE_WRITE_UNLOCK_IRQ 117 select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE 118 select ARCH_STACKWALK 119 select ARCH_SUPPORTS_ATOMIC_RMW 120 select ARCH_SUPPORTS_DEBUG_PAGEALLOC 121 select ARCH_SUPPORTS_HUGETLBFS 122 select ARCH_SUPPORTS_NUMA_BALANCING 123 select ARCH_USE_BUILTIN_BSWAP 124 select ARCH_USE_CMPXCHG_LOCKREF 125 select ARCH_WANTS_DYNAMIC_TASK_STRUCT 126 select ARCH_WANTS_NO_INSTR 127 select ARCH_WANT_DEFAULT_BPF_JIT 128 select ARCH_WANT_IPC_PARSE_VERSION 129 select ARCH_WANT_HUGETLB_PAGE_OPTIMIZE_VMEMMAP 130 select BUILDTIME_TABLE_SORT 131 select CLONE_BACKWARDS2 132 select DMA_OPS if PCI 133 select DYNAMIC_FTRACE if FUNCTION_TRACER 134 select GCC12_NO_ARRAY_BOUNDS 135 select GENERIC_ALLOCATOR 136 select GENERIC_CPU_AUTOPROBE 137 select GENERIC_CPU_VULNERABILITIES 138 select GENERIC_ENTRY 139 select GENERIC_GETTIMEOFDAY 140 select GENERIC_PTDUMP 141 select GENERIC_SMP_IDLE_THREAD 142 select GENERIC_TIME_VSYSCALL 143 select GENERIC_VDSO_TIME_NS 144 select HAVE_ALIGNED_STRUCT_PAGE if SLUB 145 select HAVE_ARCH_AUDITSYSCALL 146 select HAVE_ARCH_JUMP_LABEL 147 select HAVE_ARCH_JUMP_LABEL_RELATIVE 148 select HAVE_ARCH_KASAN 149 select HAVE_ARCH_KASAN_VMALLOC 150 select HAVE_ARCH_KCSAN 151 select HAVE_ARCH_KFENCE 152 select HAVE_ARCH_RANDOMIZE_KSTACK_OFFSET 153 select HAVE_ARCH_SECCOMP_FILTER 154 select HAVE_ARCH_SOFT_DIRTY 155 select HAVE_ARCH_TRACEHOOK 156 select HAVE_ARCH_TRANSPARENT_HUGEPAGE 157 select HAVE_ARCH_VMAP_STACK 158 select HAVE_ASM_MODVERSIONS 159 select HAVE_CMPXCHG_DOUBLE 160 select HAVE_CMPXCHG_LOCAL 161 select HAVE_DEBUG_KMEMLEAK 162 select HAVE_DMA_CONTIGUOUS 163 select HAVE_DYNAMIC_FTRACE 164 select HAVE_DYNAMIC_FTRACE_WITH_ARGS 165 select HAVE_DYNAMIC_FTRACE_WITH_DIRECT_CALLS 166 select HAVE_DYNAMIC_FTRACE_WITH_REGS 167 select HAVE_EBPF_JIT if HAVE_MARCH_Z196_FEATURES 168 select HAVE_EFFICIENT_UNALIGNED_ACCESS 169 select HAVE_FAST_GUP 170 select HAVE_FENTRY 171 select HAVE_FTRACE_MCOUNT_RECORD 172 select HAVE_FUNCTION_ARG_ACCESS_API 173 select HAVE_FUNCTION_ERROR_INJECTION 174 select HAVE_FUNCTION_GRAPH_TRACER 175 select HAVE_FUNCTION_TRACER 176 select HAVE_GCC_PLUGINS 177 select HAVE_GENERIC_VDSO 178 select HAVE_IOREMAP_PROT if PCI 179 select HAVE_KERNEL_BZIP2 180 select HAVE_KERNEL_GZIP 181 select HAVE_KERNEL_LZ4 182 select HAVE_KERNEL_LZMA 183 select HAVE_KERNEL_LZO 184 select HAVE_KERNEL_UNCOMPRESSED 185 select HAVE_KERNEL_XZ 186 select HAVE_KERNEL_ZSTD 187 select HAVE_KPROBES 188 select HAVE_KPROBES_ON_FTRACE 189 select HAVE_KRETPROBES 190 select HAVE_KVM 191 select HAVE_LIVEPATCH 192 select HAVE_MEMBLOCK_PHYS_MAP 193 select HAVE_MOD_ARCH_SPECIFIC 194 select HAVE_NMI 195 select HAVE_NOP_MCOUNT 196 select HAVE_PCI 197 select HAVE_PERF_EVENTS 198 select HAVE_PERF_REGS 199 select HAVE_PERF_USER_STACK_DUMP 200 select HAVE_REGS_AND_STACK_ACCESS_API 201 select HAVE_RELIABLE_STACKTRACE 202 select HAVE_RSEQ 203 select HAVE_SAMPLE_FTRACE_DIRECT 204 select HAVE_SAMPLE_FTRACE_DIRECT_MULTI 205 select HAVE_SETUP_PER_CPU_AREA 206 select HAVE_SOFTIRQ_ON_OWN_STACK 207 select HAVE_SYSCALL_TRACEPOINTS 208 select HAVE_VIRT_CPU_ACCOUNTING 209 select HAVE_VIRT_CPU_ACCOUNTING_IDLE 210 select IOMMU_HELPER if PCI 211 select IOMMU_SUPPORT if PCI 212 select MMU_GATHER_NO_GATHER 213 select MMU_GATHER_RCU_TABLE_FREE 214 select MMU_GATHER_MERGE_VMAS 215 select MODULES_USE_ELF_RELA 216 select NEED_DMA_MAP_STATE if PCI 217 select NEED_PER_CPU_EMBED_FIRST_CHUNK 218 select NEED_SG_DMA_LENGTH if PCI 219 select OLD_SIGACTION 220 select OLD_SIGSUSPEND3 221 select PCI_DOMAINS if PCI 222 select PCI_MSI if PCI 223 select PCI_MSI_ARCH_FALLBACKS if PCI_MSI 224 select SPARSE_IRQ 225 select SWIOTLB 226 select SYSCTL_EXCEPTION_TRACE 227 select THREAD_INFO_IN_TASK 228 select TRACE_IRQFLAGS_SUPPORT 229 select TTY 230 select VIRT_CPU_ACCOUNTING 231 select ZONE_DMA 232 # Note: keep the above list sorted alphabetically 233 234config SCHED_OMIT_FRAME_POINTER 235 def_bool y 236 237config PGTABLE_LEVELS 238 int 239 default 5 240 241source "kernel/livepatch/Kconfig" 242 243menu "Processor type and features" 244 245config HAVE_MARCH_Z10_FEATURES 246 def_bool n 247 248config HAVE_MARCH_Z196_FEATURES 249 def_bool n 250 select HAVE_MARCH_Z10_FEATURES 251 252config HAVE_MARCH_ZEC12_FEATURES 253 def_bool n 254 select HAVE_MARCH_Z196_FEATURES 255 256config HAVE_MARCH_Z13_FEATURES 257 def_bool n 258 select HAVE_MARCH_ZEC12_FEATURES 259 260config HAVE_MARCH_Z14_FEATURES 261 def_bool n 262 select HAVE_MARCH_Z13_FEATURES 263 264config HAVE_MARCH_Z15_FEATURES 265 def_bool n 266 select HAVE_MARCH_Z14_FEATURES 267 268config HAVE_MARCH_Z16_FEATURES 269 def_bool n 270 select HAVE_MARCH_Z15_FEATURES 271 272choice 273 prompt "Processor type" 274 default MARCH_Z196 275 276config MARCH_Z10 277 bool "IBM System z10" 278 select HAVE_MARCH_Z10_FEATURES 279 depends on $(cc-option,-march=z10) 280 help 281 Select this to enable optimizations for IBM System z10 (2097 and 2098 282 series). This is the oldest machine generation currently supported. 283 284config MARCH_Z196 285 bool "IBM zEnterprise 114 and 196" 286 select HAVE_MARCH_Z196_FEATURES 287 depends on $(cc-option,-march=z196) 288 help 289 Select this to enable optimizations for IBM zEnterprise 114 and 196 290 (2818 and 2817 series). The kernel will be slightly faster but will 291 not work on older machines. 292 293config MARCH_ZEC12 294 bool "IBM zBC12 and zEC12" 295 select HAVE_MARCH_ZEC12_FEATURES 296 depends on $(cc-option,-march=zEC12) 297 help 298 Select this to enable optimizations for IBM zBC12 and zEC12 (2828 and 299 2827 series). The kernel will be slightly faster but will not work on 300 older machines. 301 302config MARCH_Z13 303 bool "IBM z13s and z13" 304 select HAVE_MARCH_Z13_FEATURES 305 depends on $(cc-option,-march=z13) 306 help 307 Select this to enable optimizations for IBM z13s and z13 (2965 and 308 2964 series). The kernel will be slightly faster but will not work on 309 older machines. 310 311config MARCH_Z14 312 bool "IBM z14 ZR1 and z14" 313 select HAVE_MARCH_Z14_FEATURES 314 depends on $(cc-option,-march=z14) 315 help 316 Select this to enable optimizations for IBM z14 ZR1 and z14 (3907 317 and 3906 series). The kernel will be slightly faster but will not 318 work on older machines. 319 320config MARCH_Z15 321 bool "IBM z15" 322 select HAVE_MARCH_Z15_FEATURES 323 depends on $(cc-option,-march=z15) 324 help 325 Select this to enable optimizations for IBM z15 (8562 326 and 8561 series). The kernel will be slightly faster but will not 327 work on older machines. 328 329config MARCH_Z16 330 bool "IBM z16" 331 select HAVE_MARCH_Z16_FEATURES 332 depends on $(cc-option,-march=z16) 333 help 334 Select this to enable optimizations for IBM z16 (3931 and 335 3932 series). 336 337endchoice 338 339config MARCH_Z10_TUNE 340 def_bool TUNE_Z10 || MARCH_Z10 && TUNE_DEFAULT 341 342config MARCH_Z196_TUNE 343 def_bool TUNE_Z196 || MARCH_Z196 && TUNE_DEFAULT 344 345config MARCH_ZEC12_TUNE 346 def_bool TUNE_ZEC12 || MARCH_ZEC12 && TUNE_DEFAULT 347 348config MARCH_Z13_TUNE 349 def_bool TUNE_Z13 || MARCH_Z13 && TUNE_DEFAULT 350 351config MARCH_Z14_TUNE 352 def_bool TUNE_Z14 || MARCH_Z14 && TUNE_DEFAULT 353 354config MARCH_Z15_TUNE 355 def_bool TUNE_Z15 || MARCH_Z15 && TUNE_DEFAULT 356 357config MARCH_Z16_TUNE 358 def_bool TUNE_Z16 || MARCH_Z16 && TUNE_DEFAULT 359 360choice 361 prompt "Tune code generation" 362 default TUNE_DEFAULT 363 help 364 Cause the compiler to tune (-mtune) the generated code for a machine. 365 This will make the code run faster on the selected machine but 366 somewhat slower on other machines. 367 This option only changes how the compiler emits instructions, not the 368 selection of instructions itself, so the resulting kernel will run on 369 all other machines. 370 371config TUNE_DEFAULT 372 bool "Default" 373 help 374 Tune the generated code for the target processor for which the kernel 375 will be compiled. 376 377config TUNE_Z10 378 bool "IBM System z10" 379 380config TUNE_Z196 381 bool "IBM zEnterprise 114 and 196" 382 depends on $(cc-option,-mtune=z196) 383 384config TUNE_ZEC12 385 bool "IBM zBC12 and zEC12" 386 depends on $(cc-option,-mtune=zEC12) 387 388config TUNE_Z13 389 bool "IBM z13s and z13" 390 depends on $(cc-option,-mtune=z13) 391 392config TUNE_Z14 393 bool "IBM z14 ZR1 and z14" 394 depends on $(cc-option,-mtune=z14) 395 396config TUNE_Z15 397 bool "IBM z15" 398 depends on $(cc-option,-mtune=z15) 399 400config TUNE_Z16 401 bool "IBM z16" 402 depends on $(cc-option,-mtune=z16) 403 404endchoice 405 406config 64BIT 407 def_bool y 408 409config COMMAND_LINE_SIZE 410 int "Maximum size of kernel command line" 411 default 4096 412 range 896 1048576 413 help 414 This allows you to specify the maximum length of the kernel command 415 line. 416 417config COMPAT 418 def_bool y 419 prompt "Kernel support for 31 bit emulation" 420 select ARCH_WANT_OLD_COMPAT_IPC 421 select COMPAT_OLD_SIGACTION 422 select HAVE_UID16 423 depends on MULTIUSER 424 depends on !CC_IS_CLANG 425 help 426 Select this option if you want to enable your system kernel to 427 handle system-calls from ELF binaries for 31 bit ESA. This option 428 (and some other stuff like libraries and such) is needed for 429 executing 31 bit applications. It is safe to say "Y". 430 431config SMP 432 def_bool y 433 434config NR_CPUS 435 int "Maximum number of CPUs (2-512)" 436 range 2 512 437 default "64" 438 help 439 This allows you to specify the maximum number of CPUs which this 440 kernel will support. The maximum supported value is 512 and the 441 minimum value which makes sense is 2. 442 443 This is purely to save memory - each supported CPU adds 444 approximately sixteen kilobytes to the kernel image. 445 446config HOTPLUG_CPU 447 def_bool y 448 449config NUMA 450 bool "NUMA support" 451 depends on SCHED_TOPOLOGY 452 default n 453 help 454 Enable NUMA support 455 456 This option adds NUMA support to the kernel. 457 458config NODES_SHIFT 459 int 460 depends on NUMA 461 default "1" 462 463config SCHED_SMT 464 def_bool n 465 466config SCHED_MC 467 def_bool n 468 469config SCHED_BOOK 470 def_bool n 471 472config SCHED_DRAWER 473 def_bool n 474 475config SCHED_TOPOLOGY 476 def_bool y 477 prompt "Topology scheduler support" 478 select SCHED_SMT 479 select SCHED_MC 480 select SCHED_BOOK 481 select SCHED_DRAWER 482 help 483 Topology scheduler support improves the CPU scheduler's decision 484 making when dealing with machines that have multi-threading, 485 multiple cores or multiple books. 486 487source "kernel/Kconfig.hz" 488 489config KEXEC 490 def_bool y 491 select KEXEC_CORE 492 493config KEXEC_FILE 494 bool "kexec file based system call" 495 select KEXEC_CORE 496 depends on CRYPTO 497 depends on CRYPTO_SHA256 498 depends on CRYPTO_SHA256_S390 499 help 500 Enable the kexec file based system call. In contrast to the normal 501 kexec system call this system call takes file descriptors for the 502 kernel and initramfs as arguments. 503 504config ARCH_HAS_KEXEC_PURGATORY 505 def_bool y 506 depends on KEXEC_FILE 507 508config KEXEC_SIG 509 bool "Verify kernel signature during kexec_file_load() syscall" 510 depends on KEXEC_FILE && MODULE_SIG_FORMAT 511 help 512 This option makes kernel signature verification mandatory for 513 the kexec_file_load() syscall. 514 515 In addition to that option, you need to enable signature 516 verification for the corresponding kernel image type being 517 loaded in order for this to work. 518 519config KERNEL_NOBP 520 def_bool n 521 prompt "Enable modified branch prediction for the kernel by default" 522 help 523 If this option is selected the kernel will switch to a modified 524 branch prediction mode if the firmware interface is available. 525 The modified branch prediction mode improves the behaviour in 526 regard to speculative execution. 527 528 With the option enabled the kernel parameter "nobp=0" or "nospec" 529 can be used to run the kernel in the normal branch prediction mode. 530 531 With the option disabled the modified branch prediction mode is 532 enabled with the "nobp=1" kernel parameter. 533 534 If unsure, say N. 535 536config EXPOLINE 537 def_bool n 538 depends on $(cc-option,-mindirect-branch=thunk) 539 prompt "Avoid speculative indirect branches in the kernel" 540 help 541 Compile the kernel with the expoline compiler options to guard 542 against kernel-to-user data leaks by avoiding speculative indirect 543 branches. 544 Requires a compiler with -mindirect-branch=thunk support for full 545 protection. The kernel may run slower. 546 547 If unsure, say N. 548 549config EXPOLINE_EXTERN 550 def_bool n 551 depends on EXPOLINE 552 depends on CC_IS_GCC && GCC_VERSION >= 110200 553 depends on $(success,$(srctree)/arch/s390/tools/gcc-thunk-extern.sh $(CC)) 554 prompt "Generate expolines as extern functions." 555 help 556 This option is required for some tooling like kpatch. The kernel is 557 compiled with -mindirect-branch=thunk-extern and requires a newer 558 compiler. 559 560 If unsure, say N. 561 562choice 563 prompt "Expoline default" 564 depends on EXPOLINE 565 default EXPOLINE_FULL 566 567config EXPOLINE_OFF 568 bool "spectre_v2=off" 569 570config EXPOLINE_AUTO 571 bool "spectre_v2=auto" 572 573config EXPOLINE_FULL 574 bool "spectre_v2=on" 575 576endchoice 577 578config RELOCATABLE 579 def_bool y 580 help 581 This builds a kernel image that retains relocation information 582 so it can be loaded at an arbitrary address. 583 The kernel is linked as a position-independent executable (PIE) 584 and contains dynamic relocations which are processed early in the 585 bootup process. 586 The relocations make the kernel image about 15% larger (compressed 587 10%), but are discarded at runtime. 588 Note: this option exists only for documentation purposes, please do 589 not remove it. 590 591config RANDOMIZE_BASE 592 bool "Randomize the address of the kernel image (KASLR)" 593 default y 594 help 595 In support of Kernel Address Space Layout Randomization (KASLR), 596 this randomizes the address at which the kernel image is loaded, 597 as a security feature that deters exploit attempts relying on 598 knowledge of the location of kernel internals. 599 600endmenu 601 602menu "Memory setup" 603 604config ARCH_SPARSEMEM_ENABLE 605 def_bool y 606 select SPARSEMEM_VMEMMAP_ENABLE 607 select SPARSEMEM_VMEMMAP 608 609config ARCH_SPARSEMEM_DEFAULT 610 def_bool y 611 612config MAX_PHYSMEM_BITS 613 int "Maximum size of supported physical memory in bits (42-53)" 614 range 42 53 615 default "46" 616 help 617 This option specifies the maximum supported size of physical memory 618 in bits. Supported is any size between 2^42 (4TB) and 2^53 (8PB). 619 Increasing the number of bits also increases the kernel image size. 620 By default 46 bits (64TB) are supported. 621 622config CHECK_STACK 623 def_bool y 624 depends on !VMAP_STACK 625 prompt "Detect kernel stack overflow" 626 help 627 This option enables the compiler option -mstack-guard and 628 -mstack-size if they are available. If the compiler supports them 629 it will emit additional code to each function prolog to trigger 630 an illegal operation if the kernel stack is about to overflow. 631 632 Say N if you are unsure. 633 634config STACK_GUARD 635 int "Size of the guard area (128-1024)" 636 range 128 1024 637 depends on CHECK_STACK 638 default "256" 639 help 640 This allows you to specify the size of the guard area at the lower 641 end of the kernel stack. If the kernel stack points into the guard 642 area on function entry an illegal operation is triggered. The size 643 needs to be a power of 2. Please keep in mind that the size of an 644 interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit. 645 The minimum size for the stack guard should be 256 for 31 bit and 646 512 for 64 bit. 647 648endmenu 649 650menu "I/O subsystem" 651 652config QDIO 653 def_tristate y 654 prompt "QDIO support" 655 help 656 This driver provides the Queued Direct I/O base support for 657 IBM System z. 658 659 To compile this driver as a module, choose M here: the 660 module will be called qdio. 661 662 If unsure, say Y. 663 664if PCI 665 666config PCI_NR_FUNCTIONS 667 int "Maximum number of PCI functions (1-4096)" 668 range 1 4096 669 default "512" 670 help 671 This allows you to specify the maximum number of PCI functions which 672 this kernel will support. 673 674endif # PCI 675 676config HAS_IOMEM 677 def_bool PCI 678 679config CHSC_SCH 680 def_tristate m 681 prompt "Support for CHSC subchannels" 682 help 683 This driver allows usage of CHSC subchannels. A CHSC subchannel 684 is usually present on LPAR only. 685 The driver creates a device /dev/chsc, which may be used to 686 obtain I/O configuration information about the machine and 687 to issue asynchronous chsc commands (DANGEROUS). 688 You will usually only want to use this interface on a special 689 LPAR designated for system management. 690 691 To compile this driver as a module, choose M here: the 692 module will be called chsc_sch. 693 694 If unsure, say N. 695 696config SCM_BUS 697 def_bool y 698 prompt "SCM bus driver" 699 help 700 Bus driver for Storage Class Memory. 701 702config EADM_SCH 703 def_tristate m 704 prompt "Support for EADM subchannels" 705 depends on SCM_BUS 706 help 707 This driver allows usage of EADM subchannels. EADM subchannels act 708 as a communication vehicle for SCM increments. 709 710 To compile this driver as a module, choose M here: the 711 module will be called eadm_sch. 712 713config VFIO_CCW 714 def_tristate n 715 prompt "Support for VFIO-CCW subchannels" 716 depends on S390_CCW_IOMMU && VFIO_MDEV 717 help 718 This driver allows usage of I/O subchannels via VFIO-CCW. 719 720 To compile this driver as a module, choose M here: the 721 module will be called vfio_ccw. 722 723config VFIO_AP 724 def_tristate n 725 prompt "VFIO support for AP devices" 726 depends on S390_AP_IOMMU && VFIO_MDEV && KVM 727 depends on ZCRYPT 728 help 729 This driver grants access to Adjunct Processor (AP) devices 730 via the VFIO mediated device interface. 731 732 To compile this driver as a module, choose M here: the module 733 will be called vfio_ap. 734 735endmenu 736 737menu "Dump support" 738 739config CRASH_DUMP 740 bool "kernel crash dumps" 741 select KEXEC 742 help 743 Generate crash dump after being started by kexec. 744 Crash dump kernels are loaded in the main kernel with kexec-tools 745 into a specially reserved region and then later executed after 746 a crash by kdump/kexec. 747 Refer to <file:Documentation/s390/zfcpdump.rst> for more details on this. 748 This option also enables s390 zfcpdump. 749 See also <file:Documentation/s390/zfcpdump.rst> 750 751endmenu 752 753config CCW 754 def_bool y 755 756config HAVE_PNETID 757 tristate 758 default (SMC || CCWGROUP) 759 760menu "Virtualization" 761 762config PROTECTED_VIRTUALIZATION_GUEST 763 def_bool n 764 prompt "Protected virtualization guest support" 765 help 766 Select this option, if you want to be able to run this 767 kernel as a protected virtualization KVM guest. 768 Protected virtualization capable machines have a mini hypervisor 769 located at machine level (an ultravisor). With help of the 770 Ultravisor, KVM will be able to run "protected" VMs, special 771 VMs whose memory and management data are unavailable to KVM. 772 773config PFAULT 774 def_bool y 775 prompt "Pseudo page fault support" 776 help 777 Select this option, if you want to use PFAULT pseudo page fault 778 handling under VM. If running native or in LPAR, this option 779 has no effect. If your VM does not support PFAULT, PAGEEX 780 pseudo page fault handling will be used. 781 Note that VM 4.2 supports PFAULT but has a bug in its 782 implementation that causes some problems. 783 Everybody who wants to run Linux under VM != VM4.2 should select 784 this option. 785 786config CMM 787 def_tristate n 788 prompt "Cooperative memory management" 789 help 790 Select this option, if you want to enable the kernel interface 791 to reduce the memory size of the system. This is accomplished 792 by allocating pages of memory and put them "on hold". This only 793 makes sense for a system running under VM where the unused pages 794 will be reused by VM for other guest systems. The interface 795 allows an external monitor to balance memory of many systems. 796 Everybody who wants to run Linux under VM should select this 797 option. 798 799config CMM_IUCV 800 def_bool y 801 prompt "IUCV special message interface to cooperative memory management" 802 depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV) 803 help 804 Select this option to enable the special message interface to 805 the cooperative memory management. 806 807config APPLDATA_BASE 808 def_bool n 809 prompt "Linux - VM Monitor Stream, base infrastructure" 810 depends on PROC_SYSCTL 811 help 812 This provides a kernel interface for creating and updating z/VM APPLDATA 813 monitor records. The monitor records are updated at certain time 814 intervals, once the timer is started. 815 Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer, 816 i.e. enables or disables monitoring on the Linux side. 817 A custom interval value (in seconds) can be written to 818 /proc/appldata/interval. 819 820 Defaults are 60 seconds interval and timer off. 821 The /proc entries can also be read from, showing the current settings. 822 823config APPLDATA_MEM 824 def_tristate m 825 prompt "Monitor memory management statistics" 826 depends on APPLDATA_BASE && VM_EVENT_COUNTERS 827 help 828 This provides memory management related data to the Linux - VM Monitor 829 Stream, like paging/swapping rate, memory utilisation, etc. 830 Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM 831 APPLDATA monitor record, i.e. enables or disables monitoring this record 832 on the z/VM side. 833 834 Default is disabled. 835 The /proc entry can also be read from, showing the current settings. 836 837 This can also be compiled as a module, which will be called 838 appldata_mem.o. 839 840config APPLDATA_OS 841 def_tristate m 842 prompt "Monitor OS statistics" 843 depends on APPLDATA_BASE 844 help 845 This provides OS related data to the Linux - VM Monitor Stream, like 846 CPU utilisation, etc. 847 Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM 848 APPLDATA monitor record, i.e. enables or disables monitoring this record 849 on the z/VM side. 850 851 Default is disabled. 852 This can also be compiled as a module, which will be called 853 appldata_os.o. 854 855config APPLDATA_NET_SUM 856 def_tristate m 857 prompt "Monitor overall network statistics" 858 depends on APPLDATA_BASE && NET 859 help 860 This provides network related data to the Linux - VM Monitor Stream, 861 currently there is only a total sum of network I/O statistics, no 862 per-interface data. 863 Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM 864 APPLDATA monitor record, i.e. enables or disables monitoring this record 865 on the z/VM side. 866 867 Default is disabled. 868 This can also be compiled as a module, which will be called 869 appldata_net_sum.o. 870 871config S390_HYPFS_FS 872 def_bool y 873 prompt "s390 hypervisor file system support" 874 select SYS_HYPERVISOR 875 help 876 This is a virtual file system intended to provide accounting 877 information in an s390 hypervisor environment. 878 879source "arch/s390/kvm/Kconfig" 880 881config S390_GUEST 882 def_bool y 883 prompt "s390 support for virtio devices" 884 select TTY 885 select VIRTUALIZATION 886 select VIRTIO 887 help 888 Enabling this option adds support for virtio based paravirtual device 889 drivers on s390. 890 891 Select this option if you want to run the kernel as a guest under 892 the KVM hypervisor. 893 894endmenu 895 896config S390_MODULES_SANITY_TEST_HELPERS 897 def_bool n 898 899menu "Selftests" 900 901config S390_UNWIND_SELFTEST 902 def_tristate n 903 depends on KUNIT 904 default KUNIT_ALL_TESTS 905 prompt "Test unwind functions" 906 help 907 This option enables s390 specific stack unwinder testing kernel 908 module. This option is not useful for distributions or general 909 kernels, but only for kernel developers working on architecture code. 910 911 Say N if you are unsure. 912 913config S390_KPROBES_SANITY_TEST 914 def_tristate n 915 prompt "Enable s390 specific kprobes tests" 916 depends on KPROBES 917 depends on KUNIT 918 help 919 This option enables an s390 specific kprobes test module. This option 920 is not useful for distributions or general kernels, but only for kernel 921 developers working on architecture code. 922 923 Say N if you are unsure. 924 925config S390_MODULES_SANITY_TEST 926 def_tristate n 927 depends on KUNIT 928 default KUNIT_ALL_TESTS 929 prompt "Enable s390 specific modules tests" 930 select S390_MODULES_SANITY_TEST_HELPERS 931 help 932 This option enables an s390 specific modules test. This option is 933 not useful for distributions or general kernels, but only for 934 kernel developers working on architecture code. 935 936 Say N if you are unsure. 937endmenu 938