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