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 ARCH_PROC_KCORE_TEXT 21 def_bool y 22 23config GENERIC_HWEIGHT 24 def_bool !HAVE_MARCH_Z196_FEATURES 25 26config GENERIC_BUG 27 def_bool y if BUG 28 29config GENERIC_BUG_RELATIVE_POINTERS 30 def_bool y 31 32config GENERIC_LOCKBREAK 33 def_bool y if PREEMPTION 34 35config PGSTE 36 def_bool y if KVM 37 38config AUDIT_ARCH 39 def_bool y 40 41config NO_IOPORT_MAP 42 def_bool y 43 44config PCI_QUIRKS 45 def_bool n 46 47config ARCH_SUPPORTS_UPROBES 48 def_bool y 49 50config KASAN_SHADOW_OFFSET 51 hex 52 depends on KASAN 53 default 0x1C000000000000 54 55config CC_ASM_FLAG_OUTPUT_BROKEN 56 def_bool CC_IS_GCC && GCC_VERSION < 140200 57 help 58 GCC versions before 14.2.0 may die with an internal 59 compiler error in some configurations if flag output 60 operands are used within inline assemblies. 61 62config CC_HAS_ASM_AOR_FORMAT_FLAGS 63 def_bool !(CC_IS_CLANG && CLANG_VERSION < 190100) 64 help 65 Clang versions before 19.1.0 do not support A, 66 O, and R inline assembly format flags. 67 68config S390 69 def_bool y 70 # 71 # Note: keep this list sorted alphabetically 72 # 73 imply IMA_SECURE_AND_OR_TRUSTED_BOOT 74 select ALTERNATE_USER_ADDRESS_SPACE 75 select ARCH_32BIT_USTAT_F_TINODE 76 select ARCH_BINFMT_ELF_STATE 77 select ARCH_CORRECT_STACKTRACE_ON_KRETPROBE 78 select ARCH_ENABLE_MEMORY_HOTPLUG if SPARSEMEM 79 select ARCH_ENABLE_MEMORY_HOTREMOVE 80 select ARCH_ENABLE_SPLIT_PMD_PTLOCK if PGTABLE_LEVELS > 2 81 select ARCH_HAS_CPU_FINALIZE_INIT 82 select ARCH_HAS_CRC32 83 select ARCH_HAS_CURRENT_STACK_POINTER 84 select ARCH_HAS_DEBUG_VIRTUAL 85 select ARCH_HAS_DEBUG_VM_PGTABLE 86 select ARCH_HAS_DEBUG_WX 87 select ARCH_HAS_DEVMEM_IS_ALLOWED 88 select ARCH_HAS_DMA_OPS if PCI 89 select ARCH_HAS_ELF_RANDOMIZE 90 select ARCH_HAS_FORCE_DMA_UNENCRYPTED 91 select ARCH_HAS_FORTIFY_SOURCE 92 select ARCH_HAS_GCOV_PROFILE_ALL 93 select ARCH_HAS_GIGANTIC_PAGE 94 select ARCH_HAS_KCOV 95 select ARCH_HAS_MEMBARRIER_SYNC_CORE 96 select ARCH_HAS_MEM_ENCRYPT 97 select ARCH_HAS_NMI_SAFE_THIS_CPU_OPS 98 select ARCH_HAS_PREEMPT_LAZY 99 select ARCH_HAS_PTE_SPECIAL 100 select ARCH_HAS_SCALED_CPUTIME 101 select ARCH_HAS_SET_DIRECT_MAP 102 select ARCH_HAS_SET_MEMORY 103 select ARCH_HAS_STRICT_KERNEL_RWX 104 select ARCH_HAS_STRICT_MODULE_RWX 105 select ARCH_HAS_SYSCALL_WRAPPER 106 select ARCH_HAS_UBSAN 107 select ARCH_HAS_VDSO_TIME_DATA 108 select ARCH_HAVE_NMI_SAFE_CMPXCHG 109 select ARCH_INLINE_READ_LOCK 110 select ARCH_INLINE_READ_LOCK_BH 111 select ARCH_INLINE_READ_LOCK_IRQ 112 select ARCH_INLINE_READ_LOCK_IRQSAVE 113 select ARCH_INLINE_READ_TRYLOCK 114 select ARCH_INLINE_READ_UNLOCK 115 select ARCH_INLINE_READ_UNLOCK_BH 116 select ARCH_INLINE_READ_UNLOCK_IRQ 117 select ARCH_INLINE_READ_UNLOCK_IRQRESTORE 118 select ARCH_INLINE_SPIN_LOCK 119 select ARCH_INLINE_SPIN_LOCK_BH 120 select ARCH_INLINE_SPIN_LOCK_IRQ 121 select ARCH_INLINE_SPIN_LOCK_IRQSAVE 122 select ARCH_INLINE_SPIN_TRYLOCK 123 select ARCH_INLINE_SPIN_TRYLOCK_BH 124 select ARCH_INLINE_SPIN_UNLOCK 125 select ARCH_INLINE_SPIN_UNLOCK_BH 126 select ARCH_INLINE_SPIN_UNLOCK_IRQ 127 select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE 128 select ARCH_INLINE_WRITE_LOCK 129 select ARCH_INLINE_WRITE_LOCK_BH 130 select ARCH_INLINE_WRITE_LOCK_IRQ 131 select ARCH_INLINE_WRITE_LOCK_IRQSAVE 132 select ARCH_INLINE_WRITE_TRYLOCK 133 select ARCH_INLINE_WRITE_UNLOCK 134 select ARCH_INLINE_WRITE_UNLOCK_BH 135 select ARCH_INLINE_WRITE_UNLOCK_IRQ 136 select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE 137 select ARCH_MHP_MEMMAP_ON_MEMORY_ENABLE 138 select ARCH_STACKWALK 139 select ARCH_SUPPORTS_ATOMIC_RMW 140 select ARCH_SUPPORTS_DEBUG_PAGEALLOC 141 select ARCH_SUPPORTS_HUGETLBFS 142 select ARCH_SUPPORTS_INT128 if CC_HAS_INT128 && CC_IS_CLANG 143 select ARCH_SUPPORTS_NUMA_BALANCING 144 select ARCH_SUPPORTS_PER_VMA_LOCK 145 select ARCH_USE_BUILTIN_BSWAP 146 select ARCH_USE_CMPXCHG_LOCKREF 147 select ARCH_USE_SYM_ANNOTATIONS 148 select ARCH_WANTS_NO_INSTR 149 select ARCH_WANT_DEFAULT_BPF_JIT 150 select ARCH_WANT_IPC_PARSE_VERSION 151 select ARCH_WANT_KERNEL_PMD_MKWRITE 152 select ARCH_WANT_LD_ORPHAN_WARN 153 select ARCH_WANT_OPTIMIZE_HUGETLB_VMEMMAP 154 select BUILDTIME_TABLE_SORT 155 select CLONE_BACKWARDS2 156 select DCACHE_WORD_ACCESS if !KMSAN 157 select DYNAMIC_FTRACE if FUNCTION_TRACER 158 select FUNCTION_ALIGNMENT_8B if CC_IS_GCC 159 select FUNCTION_ALIGNMENT_16B if !CC_IS_GCC 160 select GENERIC_ALLOCATOR 161 select GENERIC_CPU_DEVICES 162 select GENERIC_CPU_AUTOPROBE 163 select GENERIC_CPU_VULNERABILITIES 164 select GENERIC_ENTRY 165 select GENERIC_GETTIMEOFDAY 166 select GENERIC_PTDUMP 167 select GENERIC_SMP_IDLE_THREAD 168 select GENERIC_TIME_VSYSCALL 169 select GENERIC_VDSO_TIME_NS 170 select GENERIC_IOREMAP if PCI 171 select HAVE_ALIGNED_STRUCT_PAGE 172 select HAVE_ARCH_AUDITSYSCALL 173 select HAVE_ARCH_JUMP_LABEL 174 select HAVE_ARCH_JUMP_LABEL_RELATIVE 175 select HAVE_ARCH_KASAN 176 select HAVE_ARCH_KASAN_VMALLOC 177 select HAVE_ARCH_KCSAN 178 select HAVE_ARCH_KMSAN 179 select HAVE_ARCH_KFENCE 180 select HAVE_ARCH_RANDOMIZE_KSTACK_OFFSET 181 select HAVE_ARCH_SECCOMP_FILTER 182 select HAVE_ARCH_SOFT_DIRTY 183 select HAVE_ARCH_STACKLEAK 184 select HAVE_ARCH_TRACEHOOK 185 select HAVE_ARCH_TRANSPARENT_HUGEPAGE 186 select HAVE_ARCH_VMAP_STACK 187 select HAVE_ASM_MODVERSIONS 188 select HAVE_CMPXCHG_DOUBLE 189 select HAVE_CMPXCHG_LOCAL 190 select HAVE_DEBUG_KMEMLEAK 191 select HAVE_DMA_CONTIGUOUS 192 select HAVE_DYNAMIC_FTRACE 193 select HAVE_DYNAMIC_FTRACE_WITH_ARGS 194 select HAVE_FTRACE_REGS_HAVING_PT_REGS 195 select HAVE_DYNAMIC_FTRACE_WITH_DIRECT_CALLS 196 select HAVE_DYNAMIC_FTRACE_WITH_REGS 197 select HAVE_EBPF_JIT if HAVE_MARCH_Z196_FEATURES 198 select HAVE_EFFICIENT_UNALIGNED_ACCESS 199 select HAVE_GUP_FAST 200 select HAVE_FENTRY 201 select HAVE_FTRACE_GRAPH_FUNC 202 select HAVE_FTRACE_MCOUNT_RECORD 203 select HAVE_FUNCTION_ARG_ACCESS_API 204 select HAVE_FUNCTION_ERROR_INJECTION 205 select HAVE_FUNCTION_GRAPH_FREGS 206 select HAVE_FUNCTION_GRAPH_TRACER 207 select HAVE_FUNCTION_TRACER 208 select HAVE_GCC_PLUGINS 209 select HAVE_GENERIC_VDSO 210 select HAVE_IOREMAP_PROT if PCI 211 select HAVE_KERNEL_BZIP2 212 select HAVE_KERNEL_GZIP 213 select HAVE_KERNEL_LZ4 214 select HAVE_KERNEL_LZMA 215 select HAVE_KERNEL_LZO 216 select HAVE_KERNEL_UNCOMPRESSED 217 select HAVE_KERNEL_XZ 218 select HAVE_KERNEL_ZSTD 219 select HAVE_KPROBES 220 select HAVE_KPROBES_ON_FTRACE 221 select HAVE_KRETPROBES 222 select HAVE_LIVEPATCH 223 select HAVE_MEMBLOCK_PHYS_MAP 224 select HAVE_MOD_ARCH_SPECIFIC 225 select HAVE_NMI 226 select HAVE_NOP_MCOUNT 227 select HAVE_PAGE_SIZE_4KB 228 select HAVE_PCI 229 select HAVE_PERF_EVENTS 230 select HAVE_PERF_REGS 231 select HAVE_PERF_USER_STACK_DUMP 232 select HAVE_PREEMPT_DYNAMIC_KEY 233 select HAVE_REGS_AND_STACK_ACCESS_API 234 select HAVE_RELIABLE_STACKTRACE 235 select HAVE_RETHOOK 236 select HAVE_RSEQ 237 select HAVE_SAMPLE_FTRACE_DIRECT 238 select HAVE_SAMPLE_FTRACE_DIRECT_MULTI 239 select HAVE_SETUP_PER_CPU_AREA 240 select HAVE_SOFTIRQ_ON_OWN_STACK 241 select HAVE_SYSCALL_TRACEPOINTS 242 select HAVE_VIRT_CPU_ACCOUNTING 243 select HAVE_VIRT_CPU_ACCOUNTING_IDLE 244 select IOMMU_HELPER if PCI 245 select IOMMU_SUPPORT if PCI 246 select KASAN_VMALLOC if KASAN 247 select LOCK_MM_AND_FIND_VMA 248 select MMU_GATHER_MERGE_VMAS 249 select MMU_GATHER_NO_GATHER 250 select MMU_GATHER_RCU_TABLE_FREE 251 select MODULES_USE_ELF_RELA 252 select NEED_DMA_MAP_STATE if PCI 253 select NEED_PER_CPU_EMBED_FIRST_CHUNK 254 select NEED_PROC_VMCORE_DEVICE_RAM if PROC_VMCORE 255 select NEED_SG_DMA_LENGTH if PCI 256 select OLD_SIGACTION 257 select OLD_SIGSUSPEND3 258 select PCI_DOMAINS if PCI 259 select PCI_MSI if PCI 260 select PCI_MSI_ARCH_FALLBACKS if PCI_MSI 261 select SPARSE_IRQ 262 select SWIOTLB 263 select SYSCTL_EXCEPTION_TRACE 264 select THREAD_INFO_IN_TASK 265 select TRACE_IRQFLAGS_SUPPORT 266 select TTY 267 select USER_STACKTRACE_SUPPORT 268 select VDSO_GETRANDOM 269 select VIRT_CPU_ACCOUNTING 270 select VMAP_STACK 271 select ZONE_DMA 272 # Note: keep the above list sorted alphabetically 273 274config SCHED_OMIT_FRAME_POINTER 275 def_bool y 276 277config PGTABLE_LEVELS 278 int 279 default 5 280 281source "kernel/livepatch/Kconfig" 282 283config ARCH_SUPPORTS_KEXEC 284 def_bool y 285 286config ARCH_SUPPORTS_KEXEC_FILE 287 def_bool y 288 289config ARCH_SUPPORTS_KEXEC_SIG 290 def_bool MODULE_SIG_FORMAT 291 292config ARCH_SUPPORTS_KEXEC_PURGATORY 293 def_bool y 294 295config ARCH_SUPPORTS_CRASH_DUMP 296 def_bool y 297 help 298 Refer to <file:Documentation/arch/s390/zfcpdump.rst> for more details on this. 299 This option also enables s390 zfcpdump. 300 See also <file:Documentation/arch/s390/zfcpdump.rst> 301 302config ARCH_DEFAULT_CRASH_DUMP 303 def_bool y 304 305menu "Processor type and features" 306 307config HAVE_MARCH_Z10_FEATURES 308 def_bool n 309 310config HAVE_MARCH_Z196_FEATURES 311 def_bool n 312 select HAVE_MARCH_Z10_FEATURES 313 314config HAVE_MARCH_ZEC12_FEATURES 315 def_bool n 316 select HAVE_MARCH_Z196_FEATURES 317 318config HAVE_MARCH_Z13_FEATURES 319 def_bool n 320 select HAVE_MARCH_ZEC12_FEATURES 321 322config HAVE_MARCH_Z14_FEATURES 323 def_bool n 324 select HAVE_MARCH_Z13_FEATURES 325 326config HAVE_MARCH_Z15_FEATURES 327 def_bool n 328 select HAVE_MARCH_Z14_FEATURES 329 330config HAVE_MARCH_Z16_FEATURES 331 def_bool n 332 select HAVE_MARCH_Z15_FEATURES 333 334choice 335 prompt "Processor type" 336 default MARCH_Z196 337 338config MARCH_Z10 339 bool "IBM System z10" 340 select HAVE_MARCH_Z10_FEATURES 341 depends on $(cc-option,-march=z10) 342 help 343 Select this to enable optimizations for IBM System z10 (2097 and 2098 344 series). This is the oldest machine generation currently supported. 345 346config MARCH_Z196 347 bool "IBM zEnterprise 114 and 196" 348 select HAVE_MARCH_Z196_FEATURES 349 depends on $(cc-option,-march=z196) 350 help 351 Select this to enable optimizations for IBM zEnterprise 114 and 196 352 (2818 and 2817 series). The kernel will be slightly faster but will 353 not work on older machines. 354 355config MARCH_ZEC12 356 bool "IBM zBC12 and zEC12" 357 select HAVE_MARCH_ZEC12_FEATURES 358 depends on $(cc-option,-march=zEC12) 359 help 360 Select this to enable optimizations for IBM zBC12 and zEC12 (2828 and 361 2827 series). The kernel will be slightly faster but will not work on 362 older machines. 363 364config MARCH_Z13 365 bool "IBM z13s and z13" 366 select HAVE_MARCH_Z13_FEATURES 367 depends on $(cc-option,-march=z13) 368 help 369 Select this to enable optimizations for IBM z13s and z13 (2965 and 370 2964 series). The kernel will be slightly faster but will not work on 371 older machines. 372 373config MARCH_Z14 374 bool "IBM z14 ZR1 and z14" 375 select HAVE_MARCH_Z14_FEATURES 376 depends on $(cc-option,-march=z14) 377 help 378 Select this to enable optimizations for IBM z14 ZR1 and z14 (3907 379 and 3906 series). The kernel will be slightly faster but will not 380 work on older machines. 381 382config MARCH_Z15 383 bool "IBM z15" 384 select HAVE_MARCH_Z15_FEATURES 385 depends on $(cc-option,-march=z15) 386 help 387 Select this to enable optimizations for IBM z15 (8562 388 and 8561 series). The kernel will be slightly faster but will not 389 work on older machines. 390 391config MARCH_Z16 392 bool "IBM z16" 393 select HAVE_MARCH_Z16_FEATURES 394 depends on $(cc-option,-march=z16) 395 help 396 Select this to enable optimizations for IBM z16 (3931 and 397 3932 series). 398 399endchoice 400 401config MARCH_Z10_TUNE 402 def_bool TUNE_Z10 || MARCH_Z10 && TUNE_DEFAULT 403 404config MARCH_Z196_TUNE 405 def_bool TUNE_Z196 || MARCH_Z196 && TUNE_DEFAULT 406 407config MARCH_ZEC12_TUNE 408 def_bool TUNE_ZEC12 || MARCH_ZEC12 && TUNE_DEFAULT 409 410config MARCH_Z13_TUNE 411 def_bool TUNE_Z13 || MARCH_Z13 && TUNE_DEFAULT 412 413config MARCH_Z14_TUNE 414 def_bool TUNE_Z14 || MARCH_Z14 && TUNE_DEFAULT 415 416config MARCH_Z15_TUNE 417 def_bool TUNE_Z15 || MARCH_Z15 && TUNE_DEFAULT 418 419config MARCH_Z16_TUNE 420 def_bool TUNE_Z16 || MARCH_Z16 && TUNE_DEFAULT 421 422choice 423 prompt "Tune code generation" 424 default TUNE_DEFAULT 425 help 426 Cause the compiler to tune (-mtune) the generated code for a machine. 427 This will make the code run faster on the selected machine but 428 somewhat slower on other machines. 429 This option only changes how the compiler emits instructions, not the 430 selection of instructions itself, so the resulting kernel will run on 431 all other machines. 432 433config TUNE_DEFAULT 434 bool "Default" 435 help 436 Tune the generated code for the target processor for which the kernel 437 will be compiled. 438 439config TUNE_Z10 440 bool "IBM System z10" 441 442config TUNE_Z196 443 bool "IBM zEnterprise 114 and 196" 444 depends on $(cc-option,-mtune=z196) 445 446config TUNE_ZEC12 447 bool "IBM zBC12 and zEC12" 448 depends on $(cc-option,-mtune=zEC12) 449 450config TUNE_Z13 451 bool "IBM z13s and z13" 452 depends on $(cc-option,-mtune=z13) 453 454config TUNE_Z14 455 bool "IBM z14 ZR1 and z14" 456 depends on $(cc-option,-mtune=z14) 457 458config TUNE_Z15 459 bool "IBM z15" 460 depends on $(cc-option,-mtune=z15) 461 462config TUNE_Z16 463 bool "IBM z16" 464 depends on $(cc-option,-mtune=z16) 465 466endchoice 467 468config 64BIT 469 def_bool y 470 471config COMMAND_LINE_SIZE 472 int "Maximum size of kernel command line" 473 default 4096 474 range 896 1048576 475 help 476 This allows you to specify the maximum length of the kernel command 477 line. 478 479config COMPAT 480 def_bool n 481 prompt "Kernel support for 31 bit emulation" 482 select ARCH_WANT_OLD_COMPAT_IPC 483 select COMPAT_OLD_SIGACTION 484 select HAVE_UID16 485 depends on MULTIUSER 486 depends on !CC_IS_CLANG && !LD_IS_LLD 487 help 488 Select this option if you want to enable your system kernel to 489 handle system-calls from ELF binaries for 31 bit ESA. This option 490 (and some other stuff like libraries and such) is needed for 491 executing 31 bit applications. 492 493 If unsure say N. 494 495config SMP 496 def_bool y 497 498config NR_CPUS 499 int "Maximum number of CPUs (2-512)" 500 range 2 512 501 default "64" 502 help 503 This allows you to specify the maximum number of CPUs which this 504 kernel will support. The maximum supported value is 512 and the 505 minimum value which makes sense is 2. 506 507 This is purely to save memory - each supported CPU adds 508 approximately sixteen kilobytes to the kernel image. 509 510config HOTPLUG_CPU 511 def_bool y 512 513config NUMA 514 bool "NUMA support" 515 depends on SCHED_TOPOLOGY 516 default n 517 help 518 Enable NUMA support 519 520 This option adds NUMA support to the kernel. 521 522config NODES_SHIFT 523 int 524 depends on NUMA 525 default "1" 526 527config SCHED_SMT 528 def_bool n 529 530config SCHED_MC 531 def_bool n 532 533config SCHED_TOPOLOGY 534 def_bool y 535 prompt "Topology scheduler support" 536 select SCHED_SMT 537 select SCHED_MC 538 help 539 Topology scheduler support improves the CPU scheduler's decision 540 making when dealing with machines that have multi-threading, 541 multiple cores or multiple books. 542 543config SCHED_TOPOLOGY_VERTICAL 544 def_bool y 545 bool "Use vertical CPU polarization by default" 546 depends on SCHED_TOPOLOGY 547 help 548 Use vertical CPU polarization by default if available. 549 The default CPU polarization is horizontal. 550 551config HIPERDISPATCH_ON 552 def_bool y 553 bool "Use hiperdispatch on vertical polarization by default" 554 depends on SCHED_TOPOLOGY 555 depends on PROC_SYSCTL 556 help 557 Hiperdispatch aims to improve the CPU scheduler's decision 558 making when using vertical polarization by adjusting CPU 559 capacities dynamically. Set this option to use hiperdispatch 560 on vertical polarization by default. This can be overwritten 561 by sysctl's s390.hiperdispatch attribute later on. 562 563source "kernel/Kconfig.hz" 564 565config CERT_STORE 566 bool "Get user certificates via DIAG320" 567 depends on KEYS 568 select CRYPTO_LIB_SHA256 569 help 570 Enable this option if you want to access user-provided secure boot 571 certificates via DIAG 0x320. 572 573 These certificates will be made available via the keyring named 574 'cert_store'. 575 576config KERNEL_NOBP 577 def_bool n 578 prompt "Enable modified branch prediction for the kernel by default" 579 help 580 If this option is selected the kernel will switch to a modified 581 branch prediction mode if the firmware interface is available. 582 The modified branch prediction mode improves the behaviour in 583 regard to speculative execution. 584 585 With the option enabled the kernel parameter "nobp=0" or "nospec" 586 can be used to run the kernel in the normal branch prediction mode. 587 588 With the option disabled the modified branch prediction mode is 589 enabled with the "nobp=1" kernel parameter. 590 591 If unsure, say N. 592 593config EXPOLINE 594 def_bool n 595 depends on $(cc-option,-mindirect-branch=thunk) 596 prompt "Avoid speculative indirect branches in the kernel" 597 help 598 Compile the kernel with the expoline compiler options to guard 599 against kernel-to-user data leaks by avoiding speculative indirect 600 branches. 601 Requires a compiler with -mindirect-branch=thunk support for full 602 protection. The kernel may run slower. 603 604 If unsure, say N. 605 606config EXPOLINE_EXTERN 607 def_bool EXPOLINE && CC_IS_GCC && GCC_VERSION >= 110200 && \ 608 $(success,$(srctree)/arch/s390/tools/gcc-thunk-extern.sh $(CC)) 609 help 610 Generate expolines as external functions if the compiler supports it. 611 This option is required for some tooling like kpatch, if expolines 612 are enabled. The kernel is compiled with 613 -mindirect-branch=thunk-extern, which requires a newer compiler. 614 615choice 616 prompt "Expoline default" 617 depends on EXPOLINE 618 default EXPOLINE_FULL 619 620config EXPOLINE_OFF 621 bool "spectre_v2=off" 622 623config EXPOLINE_AUTO 624 bool "spectre_v2=auto" 625 626config EXPOLINE_FULL 627 bool "spectre_v2=on" 628 629endchoice 630 631config RELOCATABLE 632 def_bool y 633 help 634 This builds a kernel image that retains relocation information 635 so it can be loaded at an arbitrary address. 636 The relocations make the kernel image about 15% larger (compressed 637 10%), but are discarded at runtime. 638 Note: this option exists only for documentation purposes, please do 639 not remove it. 640 641config RANDOMIZE_BASE 642 bool "Randomize the address of the kernel image (KASLR)" 643 default y 644 help 645 In support of Kernel Address Space Layout Randomization (KASLR), 646 this randomizes the address at which the kernel image is loaded, 647 as a security feature that deters exploit attempts relying on 648 knowledge of the location of kernel internals. 649 650config RANDOMIZE_IDENTITY_BASE 651 bool "Randomize the address of the identity mapping base" 652 depends on RANDOMIZE_BASE 653 default DEBUG_VM 654 help 655 The identity mapping base address is pinned to zero by default. 656 Allow randomization of that base to expose otherwise missed 657 notion of physical and virtual addresses of data structures. 658 That does not have any impact on the base address at which the 659 kernel image is loaded. 660 661 If unsure, say N 662 663config KERNEL_IMAGE_BASE 664 hex "Kernel image base address" 665 range 0x100000 0x1FFFFFE0000000 if !KASAN 666 range 0x100000 0x1BFFFFE0000000 if KASAN 667 default 0x3FFE0000000 if !KASAN 668 default 0x7FFFE0000000 if KASAN 669 help 670 This is the address at which the kernel image is loaded in case 671 Kernel Address Space Layout Randomization (KASLR) is disabled. 672 673 In case the Protected virtualization guest support is enabled the 674 Ultravisor imposes a virtual address limit. If the value of this 675 option leads to the kernel image exceeding the Ultravisor limit, 676 this option is ignored and the image is loaded below the limit. 677 678 If the value of this option leads to the kernel image overlapping 679 the virtual memory where other data structures are located, this 680 option is ignored and the image is loaded above the structures. 681 682endmenu 683 684menu "Memory setup" 685 686config ARCH_SPARSEMEM_ENABLE 687 def_bool y 688 select SPARSEMEM_VMEMMAP_ENABLE 689 select SPARSEMEM_VMEMMAP 690 691config ARCH_SPARSEMEM_DEFAULT 692 def_bool y 693 694config MAX_PHYSMEM_BITS 695 int "Maximum size of supported physical memory in bits (42-53)" 696 range 42 53 697 default "46" 698 help 699 This option specifies the maximum supported size of physical memory 700 in bits. Supported is any size between 2^42 (4TB) and 2^53 (8PB). 701 Increasing the number of bits also increases the kernel image size. 702 By default 46 bits (64TB) are supported. 703 704endmenu 705 706menu "I/O subsystem" 707 708config QDIO 709 def_tristate y 710 prompt "QDIO support" 711 help 712 This driver provides the Queued Direct I/O base support for 713 IBM System z. 714 715 To compile this driver as a module, choose M here: the 716 module will be called qdio. 717 718 If unsure, say Y. 719 720if PCI 721 722config PCI_NR_FUNCTIONS 723 int "Maximum number of PCI functions (1-4096)" 724 range 1 4096 725 default "512" 726 help 727 This allows you to specify the maximum number of PCI functions which 728 this kernel will support. 729 730endif # PCI 731 732config HAS_IOMEM 733 def_bool PCI 734 735config CHSC_SCH 736 def_tristate m 737 prompt "Support for CHSC subchannels" 738 help 739 This driver allows usage of CHSC subchannels. A CHSC subchannel 740 is usually present on LPAR only. 741 The driver creates a device /dev/chsc, which may be used to 742 obtain I/O configuration information about the machine and 743 to issue asynchronous chsc commands (DANGEROUS). 744 You will usually only want to use this interface on a special 745 LPAR designated for system management. 746 747 To compile this driver as a module, choose M here: the 748 module will be called chsc_sch. 749 750 If unsure, say N. 751 752config SCM_BUS 753 def_bool y 754 prompt "SCM bus driver" 755 help 756 Bus driver for Storage Class Memory. 757 758config EADM_SCH 759 def_tristate m 760 prompt "Support for EADM subchannels" 761 depends on SCM_BUS 762 help 763 This driver allows usage of EADM subchannels. EADM subchannels act 764 as a communication vehicle for SCM increments. 765 766 To compile this driver as a module, choose M here: the 767 module will be called eadm_sch. 768 769config AP 770 def_tristate y 771 prompt "Support for Adjunct Processors (ap)" 772 help 773 This driver allows usage to Adjunct Processor (AP) devices via 774 the ap bus, cards and queues. Supported Adjunct Processors are 775 the CryptoExpress Cards (CEX). 776 777 To compile this driver as a module, choose M here: the 778 module will be called ap. 779 780 If unsure, say Y (default). 781 782config AP_DEBUG 783 def_bool n 784 prompt "Enable debug features for Adjunct Processor (ap) devices" 785 depends on AP 786 help 787 Say 'Y' here to enable some additional debug features for Adjunct 788 Processor (ap) devices. 789 790 There will be some more sysfs attributes displayed for ap queues. 791 792 Do not enable on production level kernel build. 793 794 If unsure, say N. 795 796config VFIO_CCW 797 def_tristate n 798 prompt "Support for VFIO-CCW subchannels" 799 depends on VFIO 800 select VFIO_MDEV 801 help 802 This driver allows usage of I/O subchannels via VFIO-CCW. 803 804 To compile this driver as a module, choose M here: the 805 module will be called vfio_ccw. 806 807config VFIO_AP 808 def_tristate n 809 prompt "VFIO support for AP devices" 810 depends on KVM 811 depends on VFIO 812 depends on AP 813 select VFIO_MDEV 814 help 815 This driver grants access to Adjunct Processor (AP) devices 816 via the VFIO mediated device interface. 817 818 To compile this driver as a module, choose M here: the module 819 will be called vfio_ap. 820 821endmenu 822 823config CCW 824 def_bool y 825 826config HAVE_PNETID 827 tristate 828 default (SMC || CCWGROUP) 829 830menu "Virtualization" 831 832config PFAULT 833 def_bool y 834 prompt "Pseudo page fault support" 835 help 836 Select this option, if you want to use PFAULT pseudo page fault 837 handling under VM. If running native or in LPAR, this option 838 has no effect. If your VM does not support PFAULT, PAGEEX 839 pseudo page fault handling will be used. 840 Note that VM 4.2 supports PFAULT but has a bug in its 841 implementation that causes some problems. 842 Everybody who wants to run Linux under VM != VM4.2 should select 843 this option. 844 845config CMM 846 def_tristate n 847 prompt "Cooperative memory management" 848 help 849 Select this option, if you want to enable the kernel interface 850 to reduce the memory size of the system. This is accomplished 851 by allocating pages of memory and put them "on hold". This only 852 makes sense for a system running under VM where the unused pages 853 will be reused by VM for other guest systems. The interface 854 allows an external monitor to balance memory of many systems. 855 Everybody who wants to run Linux under VM should select this 856 option. 857 858config CMM_IUCV 859 def_bool y 860 prompt "IUCV special message interface to cooperative memory management" 861 depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV) 862 help 863 Select this option to enable the special message interface to 864 the cooperative memory management. 865 866config APPLDATA_BASE 867 def_bool n 868 prompt "Linux - VM Monitor Stream, base infrastructure" 869 depends on PROC_SYSCTL 870 help 871 This provides a kernel interface for creating and updating z/VM APPLDATA 872 monitor records. The monitor records are updated at certain time 873 intervals, once the timer is started. 874 Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer, 875 i.e. enables or disables monitoring on the Linux side. 876 A custom interval value (in seconds) can be written to 877 /proc/appldata/interval. 878 879 Defaults are 60 seconds interval and timer off. 880 The /proc entries can also be read from, showing the current settings. 881 882config APPLDATA_MEM 883 def_tristate m 884 prompt "Monitor memory management statistics" 885 depends on APPLDATA_BASE && VM_EVENT_COUNTERS 886 help 887 This provides memory management related data to the Linux - VM Monitor 888 Stream, like paging/swapping rate, memory utilisation, etc. 889 Writing 1 or 0 to /proc/appldata/memory 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 The /proc entry can also be read from, showing the current settings. 895 896 This can also be compiled as a module, which will be called 897 appldata_mem.o. 898 899config APPLDATA_OS 900 def_tristate m 901 prompt "Monitor OS statistics" 902 depends on APPLDATA_BASE 903 help 904 This provides OS related data to the Linux - VM Monitor Stream, like 905 CPU utilisation, etc. 906 Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM 907 APPLDATA monitor record, i.e. enables or disables monitoring this record 908 on the z/VM side. 909 910 Default is disabled. 911 This can also be compiled as a module, which will be called 912 appldata_os.o. 913 914config APPLDATA_NET_SUM 915 def_tristate m 916 prompt "Monitor overall network statistics" 917 depends on APPLDATA_BASE && NET 918 help 919 This provides network related data to the Linux - VM Monitor Stream, 920 currently there is only a total sum of network I/O statistics, no 921 per-interface data. 922 Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM 923 APPLDATA monitor record, i.e. enables or disables monitoring this record 924 on the z/VM side. 925 926 Default is disabled. 927 This can also be compiled as a module, which will be called 928 appldata_net_sum.o. 929 930config S390_HYPFS 931 def_bool y 932 prompt "s390 hypervisor information" 933 help 934 This provides several binary files at (debugfs)/s390_hypfs/ to 935 provide accounting information in an s390 hypervisor environment. 936 937config S390_HYPFS_FS 938 def_bool n 939 prompt "s390 hypervisor file system support" 940 select SYS_HYPERVISOR 941 depends on S390_HYPFS 942 help 943 This is a virtual file system intended to provide accounting 944 information in an s390 hypervisor environment. This file system 945 is deprecated and should not be used. 946 947 Say N if you are unsure. 948 949source "arch/s390/kvm/Kconfig" 950 951config S390_GUEST 952 def_bool y 953 prompt "s390 support for virtio devices" 954 select TTY 955 select VIRTUALIZATION 956 select VIRTIO 957 help 958 Enabling this option adds support for virtio based paravirtual device 959 drivers on s390. 960 961 Select this option if you want to run the kernel as a guest under 962 the KVM hypervisor. 963 964endmenu 965 966config S390_MODULES_SANITY_TEST_HELPERS 967 def_bool n 968 969menu "Selftests" 970 971config S390_UNWIND_SELFTEST 972 def_tristate n 973 depends on KUNIT 974 default KUNIT_ALL_TESTS 975 prompt "Test unwind functions" 976 help 977 This option enables s390 specific stack unwinder testing kernel 978 module. This option is not useful for distributions or general 979 kernels, but only for kernel developers working on architecture code. 980 981 Say N if you are unsure. 982 983config S390_KPROBES_SANITY_TEST 984 def_tristate n 985 prompt "Enable s390 specific kprobes tests" 986 depends on KPROBES 987 depends on KUNIT 988 help 989 This option enables an s390 specific kprobes test module. This option 990 is not useful for distributions or general kernels, but only for kernel 991 developers working on architecture code. 992 993 Say N if you are unsure. 994 995config S390_MODULES_SANITY_TEST 996 def_tristate n 997 depends on KUNIT 998 default KUNIT_ALL_TESTS 999 prompt "Enable s390 specific modules tests" 1000 select S390_MODULES_SANITY_TEST_HELPERS 1001 help 1002 This option enables an s390 specific modules test. This option is 1003 not useful for distributions or general kernels, but only for 1004 kernel developers working on architecture code. 1005 1006 Say N if you are unsure. 1007endmenu 1008