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_MEMBARRIER_SYNC_CORE 76 select ARCH_HAS_MEM_ENCRYPT 77 select ARCH_HAS_NMI_SAFE_THIS_CPU_OPS 78 select ARCH_HAS_PTE_SPECIAL 79 select ARCH_HAS_SCALED_CPUTIME 80 select ARCH_HAS_SET_DIRECT_MAP 81 select ARCH_HAS_SET_MEMORY 82 select ARCH_HAS_STRICT_KERNEL_RWX 83 select ARCH_HAS_STRICT_MODULE_RWX 84 select ARCH_HAS_SYSCALL_WRAPPER 85 select ARCH_HAS_UBSAN_SANITIZE_ALL 86 select ARCH_HAS_VDSO_DATA 87 select ARCH_HAVE_NMI_SAFE_CMPXCHG 88 select ARCH_INLINE_READ_LOCK 89 select ARCH_INLINE_READ_LOCK_BH 90 select ARCH_INLINE_READ_LOCK_IRQ 91 select ARCH_INLINE_READ_LOCK_IRQSAVE 92 select ARCH_INLINE_READ_TRYLOCK 93 select ARCH_INLINE_READ_UNLOCK 94 select ARCH_INLINE_READ_UNLOCK_BH 95 select ARCH_INLINE_READ_UNLOCK_IRQ 96 select ARCH_INLINE_READ_UNLOCK_IRQRESTORE 97 select ARCH_INLINE_SPIN_LOCK 98 select ARCH_INLINE_SPIN_LOCK_BH 99 select ARCH_INLINE_SPIN_LOCK_IRQ 100 select ARCH_INLINE_SPIN_LOCK_IRQSAVE 101 select ARCH_INLINE_SPIN_TRYLOCK 102 select ARCH_INLINE_SPIN_TRYLOCK_BH 103 select ARCH_INLINE_SPIN_UNLOCK 104 select ARCH_INLINE_SPIN_UNLOCK_BH 105 select ARCH_INLINE_SPIN_UNLOCK_IRQ 106 select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE 107 select ARCH_INLINE_WRITE_LOCK 108 select ARCH_INLINE_WRITE_LOCK_BH 109 select ARCH_INLINE_WRITE_LOCK_IRQ 110 select ARCH_INLINE_WRITE_LOCK_IRQSAVE 111 select ARCH_INLINE_WRITE_TRYLOCK 112 select ARCH_INLINE_WRITE_UNLOCK 113 select ARCH_INLINE_WRITE_UNLOCK_BH 114 select ARCH_INLINE_WRITE_UNLOCK_IRQ 115 select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE 116 select ARCH_MHP_MEMMAP_ON_MEMORY_ENABLE 117 select ARCH_STACKWALK 118 select ARCH_SUPPORTS_ATOMIC_RMW 119 select ARCH_SUPPORTS_DEBUG_PAGEALLOC 120 select ARCH_SUPPORTS_HUGETLBFS 121 select ARCH_SUPPORTS_INT128 if CC_HAS_INT128 && CC_IS_CLANG 122 select ARCH_SUPPORTS_NUMA_BALANCING 123 select ARCH_SUPPORTS_PER_VMA_LOCK 124 select ARCH_USE_BUILTIN_BSWAP 125 select ARCH_USE_CMPXCHG_LOCKREF 126 select ARCH_USE_SYM_ANNOTATIONS 127 select ARCH_WANTS_NO_INSTR 128 select ARCH_WANT_DEFAULT_BPF_JIT 129 select ARCH_WANT_IPC_PARSE_VERSION 130 select ARCH_WANT_KERNEL_PMD_MKWRITE 131 select ARCH_WANT_OPTIMIZE_HUGETLB_VMEMMAP 132 select BUILDTIME_TABLE_SORT 133 select CLONE_BACKWARDS2 134 select DCACHE_WORD_ACCESS if !KMSAN 135 select DMA_OPS if PCI 136 select DYNAMIC_FTRACE if FUNCTION_TRACER 137 select FUNCTION_ALIGNMENT_8B if CC_IS_GCC 138 select FUNCTION_ALIGNMENT_16B if !CC_IS_GCC 139 select GENERIC_ALLOCATOR 140 select GENERIC_CPU_AUTOPROBE 141 select GENERIC_CPU_VULNERABILITIES 142 select GENERIC_ENTRY 143 select GENERIC_GETTIMEOFDAY 144 select GENERIC_PTDUMP 145 select GENERIC_SMP_IDLE_THREAD 146 select GENERIC_TIME_VSYSCALL 147 select GENERIC_VDSO_TIME_NS 148 select GENERIC_IOREMAP if PCI 149 select HAVE_ALIGNED_STRUCT_PAGE 150 select HAVE_ARCH_AUDITSYSCALL 151 select HAVE_ARCH_JUMP_LABEL 152 select HAVE_ARCH_JUMP_LABEL_RELATIVE 153 select HAVE_ARCH_KASAN 154 select HAVE_ARCH_KASAN_VMALLOC 155 select HAVE_ARCH_KCSAN 156 select HAVE_ARCH_KFENCE 157 select HAVE_ARCH_RANDOMIZE_KSTACK_OFFSET 158 select HAVE_ARCH_SECCOMP_FILTER 159 select HAVE_ARCH_SOFT_DIRTY 160 select HAVE_ARCH_STACKLEAK 161 select HAVE_ARCH_TRACEHOOK 162 select HAVE_ARCH_TRANSPARENT_HUGEPAGE 163 select HAVE_ARCH_VMAP_STACK 164 select HAVE_ASM_MODVERSIONS 165 select HAVE_CMPXCHG_DOUBLE 166 select HAVE_CMPXCHG_LOCAL 167 select HAVE_DEBUG_KMEMLEAK 168 select HAVE_DMA_CONTIGUOUS 169 select HAVE_DYNAMIC_FTRACE 170 select HAVE_DYNAMIC_FTRACE_WITH_ARGS 171 select HAVE_DYNAMIC_FTRACE_WITH_DIRECT_CALLS 172 select HAVE_DYNAMIC_FTRACE_WITH_REGS 173 select HAVE_EBPF_JIT if HAVE_MARCH_Z196_FEATURES 174 select HAVE_EFFICIENT_UNALIGNED_ACCESS 175 select HAVE_FAST_GUP 176 select HAVE_FENTRY 177 select HAVE_FTRACE_MCOUNT_RECORD 178 select HAVE_FUNCTION_ARG_ACCESS_API 179 select HAVE_FUNCTION_ERROR_INJECTION 180 select HAVE_FUNCTION_GRAPH_RETVAL 181 select HAVE_FUNCTION_GRAPH_TRACER 182 select HAVE_FUNCTION_TRACER 183 select HAVE_GCC_PLUGINS 184 select HAVE_GENERIC_VDSO 185 select HAVE_IOREMAP_PROT if PCI 186 select HAVE_KERNEL_BZIP2 187 select HAVE_KERNEL_GZIP 188 select HAVE_KERNEL_LZ4 189 select HAVE_KERNEL_LZMA 190 select HAVE_KERNEL_LZO 191 select HAVE_KERNEL_UNCOMPRESSED 192 select HAVE_KERNEL_XZ 193 select HAVE_KERNEL_ZSTD 194 select HAVE_KPROBES 195 select HAVE_KPROBES_ON_FTRACE 196 select HAVE_KRETPROBES 197 select HAVE_KVM 198 select HAVE_LIVEPATCH 199 select HAVE_MEMBLOCK_PHYS_MAP 200 select HAVE_MOD_ARCH_SPECIFIC 201 select HAVE_NMI 202 select HAVE_NOP_MCOUNT 203 select HAVE_PCI 204 select HAVE_PERF_EVENTS 205 select HAVE_PERF_REGS 206 select HAVE_PERF_USER_STACK_DUMP 207 select HAVE_REGS_AND_STACK_ACCESS_API 208 select HAVE_RELIABLE_STACKTRACE 209 select HAVE_RETHOOK 210 select HAVE_RSEQ 211 select HAVE_SAMPLE_FTRACE_DIRECT 212 select HAVE_SAMPLE_FTRACE_DIRECT_MULTI 213 select HAVE_SETUP_PER_CPU_AREA 214 select HAVE_SOFTIRQ_ON_OWN_STACK 215 select HAVE_SYSCALL_TRACEPOINTS 216 select HAVE_VIRT_CPU_ACCOUNTING 217 select HAVE_VIRT_CPU_ACCOUNTING_IDLE 218 select IOMMU_HELPER if PCI 219 select IOMMU_SUPPORT if PCI 220 select MMU_GATHER_MERGE_VMAS 221 select MMU_GATHER_NO_GATHER 222 select MMU_GATHER_RCU_TABLE_FREE 223 select MODULES_USE_ELF_RELA 224 select NEED_DMA_MAP_STATE if PCI 225 select NEED_PER_CPU_EMBED_FIRST_CHUNK 226 select NEED_SG_DMA_LENGTH if PCI 227 select OLD_SIGACTION 228 select OLD_SIGSUSPEND3 229 select PCI_DOMAINS if PCI 230 select PCI_MSI if PCI 231 select PCI_MSI_ARCH_FALLBACKS if PCI_MSI 232 select SPARSE_IRQ 233 select SWIOTLB 234 select SYSCTL_EXCEPTION_TRACE 235 select THREAD_INFO_IN_TASK 236 select TRACE_IRQFLAGS_SUPPORT 237 select TTY 238 select USER_STACKTRACE_SUPPORT 239 select VIRT_CPU_ACCOUNTING 240 select ZONE_DMA 241 # Note: keep the above list sorted alphabetically 242 243config SCHED_OMIT_FRAME_POINTER 244 def_bool y 245 246config PGTABLE_LEVELS 247 int 248 default 5 249 250source "kernel/livepatch/Kconfig" 251 252config ARCH_SUPPORTS_KEXEC 253 def_bool y 254 255config ARCH_SUPPORTS_KEXEC_FILE 256 def_bool y 257 258config ARCH_SUPPORTS_KEXEC_SIG 259 def_bool MODULE_SIG_FORMAT 260 261config ARCH_SUPPORTS_KEXEC_PURGATORY 262 def_bool y 263 264config ARCH_SUPPORTS_CRASH_DUMP 265 def_bool y 266 help 267 Refer to <file:Documentation/arch/s390/zfcpdump.rst> for more details on this. 268 This option also enables s390 zfcpdump. 269 See also <file:Documentation/arch/s390/zfcpdump.rst> 270 271menu "Processor type and features" 272 273config HAVE_MARCH_Z10_FEATURES 274 def_bool n 275 276config HAVE_MARCH_Z196_FEATURES 277 def_bool n 278 select HAVE_MARCH_Z10_FEATURES 279 280config HAVE_MARCH_ZEC12_FEATURES 281 def_bool n 282 select HAVE_MARCH_Z196_FEATURES 283 284config HAVE_MARCH_Z13_FEATURES 285 def_bool n 286 select HAVE_MARCH_ZEC12_FEATURES 287 288config HAVE_MARCH_Z14_FEATURES 289 def_bool n 290 select HAVE_MARCH_Z13_FEATURES 291 292config HAVE_MARCH_Z15_FEATURES 293 def_bool n 294 select HAVE_MARCH_Z14_FEATURES 295 296config HAVE_MARCH_Z16_FEATURES 297 def_bool n 298 select HAVE_MARCH_Z15_FEATURES 299 300choice 301 prompt "Processor type" 302 default MARCH_Z196 303 304config MARCH_Z10 305 bool "IBM System z10" 306 select HAVE_MARCH_Z10_FEATURES 307 depends on $(cc-option,-march=z10) 308 help 309 Select this to enable optimizations for IBM System z10 (2097 and 2098 310 series). This is the oldest machine generation currently supported. 311 312config MARCH_Z196 313 bool "IBM zEnterprise 114 and 196" 314 select HAVE_MARCH_Z196_FEATURES 315 depends on $(cc-option,-march=z196) 316 help 317 Select this to enable optimizations for IBM zEnterprise 114 and 196 318 (2818 and 2817 series). The kernel will be slightly faster but will 319 not work on older machines. 320 321config MARCH_ZEC12 322 bool "IBM zBC12 and zEC12" 323 select HAVE_MARCH_ZEC12_FEATURES 324 depends on $(cc-option,-march=zEC12) 325 help 326 Select this to enable optimizations for IBM zBC12 and zEC12 (2828 and 327 2827 series). The kernel will be slightly faster but will not work on 328 older machines. 329 330config MARCH_Z13 331 bool "IBM z13s and z13" 332 select HAVE_MARCH_Z13_FEATURES 333 depends on $(cc-option,-march=z13) 334 help 335 Select this to enable optimizations for IBM z13s and z13 (2965 and 336 2964 series). The kernel will be slightly faster but will not work on 337 older machines. 338 339config MARCH_Z14 340 bool "IBM z14 ZR1 and z14" 341 select HAVE_MARCH_Z14_FEATURES 342 depends on $(cc-option,-march=z14) 343 help 344 Select this to enable optimizations for IBM z14 ZR1 and z14 (3907 345 and 3906 series). The kernel will be slightly faster but will not 346 work on older machines. 347 348config MARCH_Z15 349 bool "IBM z15" 350 select HAVE_MARCH_Z15_FEATURES 351 depends on $(cc-option,-march=z15) 352 help 353 Select this to enable optimizations for IBM z15 (8562 354 and 8561 series). The kernel will be slightly faster but will not 355 work on older machines. 356 357config MARCH_Z16 358 bool "IBM z16" 359 select HAVE_MARCH_Z16_FEATURES 360 depends on $(cc-option,-march=z16) 361 help 362 Select this to enable optimizations for IBM z16 (3931 and 363 3932 series). 364 365endchoice 366 367config MARCH_Z10_TUNE 368 def_bool TUNE_Z10 || MARCH_Z10 && TUNE_DEFAULT 369 370config MARCH_Z196_TUNE 371 def_bool TUNE_Z196 || MARCH_Z196 && TUNE_DEFAULT 372 373config MARCH_ZEC12_TUNE 374 def_bool TUNE_ZEC12 || MARCH_ZEC12 && TUNE_DEFAULT 375 376config MARCH_Z13_TUNE 377 def_bool TUNE_Z13 || MARCH_Z13 && TUNE_DEFAULT 378 379config MARCH_Z14_TUNE 380 def_bool TUNE_Z14 || MARCH_Z14 && TUNE_DEFAULT 381 382config MARCH_Z15_TUNE 383 def_bool TUNE_Z15 || MARCH_Z15 && TUNE_DEFAULT 384 385config MARCH_Z16_TUNE 386 def_bool TUNE_Z16 || MARCH_Z16 && TUNE_DEFAULT 387 388choice 389 prompt "Tune code generation" 390 default TUNE_DEFAULT 391 help 392 Cause the compiler to tune (-mtune) the generated code for a machine. 393 This will make the code run faster on the selected machine but 394 somewhat slower on other machines. 395 This option only changes how the compiler emits instructions, not the 396 selection of instructions itself, so the resulting kernel will run on 397 all other machines. 398 399config TUNE_DEFAULT 400 bool "Default" 401 help 402 Tune the generated code for the target processor for which the kernel 403 will be compiled. 404 405config TUNE_Z10 406 bool "IBM System z10" 407 408config TUNE_Z196 409 bool "IBM zEnterprise 114 and 196" 410 depends on $(cc-option,-mtune=z196) 411 412config TUNE_ZEC12 413 bool "IBM zBC12 and zEC12" 414 depends on $(cc-option,-mtune=zEC12) 415 416config TUNE_Z13 417 bool "IBM z13s and z13" 418 depends on $(cc-option,-mtune=z13) 419 420config TUNE_Z14 421 bool "IBM z14 ZR1 and z14" 422 depends on $(cc-option,-mtune=z14) 423 424config TUNE_Z15 425 bool "IBM z15" 426 depends on $(cc-option,-mtune=z15) 427 428config TUNE_Z16 429 bool "IBM z16" 430 depends on $(cc-option,-mtune=z16) 431 432endchoice 433 434config 64BIT 435 def_bool y 436 437config COMMAND_LINE_SIZE 438 int "Maximum size of kernel command line" 439 default 4096 440 range 896 1048576 441 help 442 This allows you to specify the maximum length of the kernel command 443 line. 444 445config COMPAT 446 def_bool n 447 prompt "Kernel support for 31 bit emulation" 448 select ARCH_WANT_OLD_COMPAT_IPC 449 select COMPAT_OLD_SIGACTION 450 select HAVE_UID16 451 depends on MULTIUSER 452 depends on !CC_IS_CLANG 453 help 454 Select this option if you want to enable your system kernel to 455 handle system-calls from ELF binaries for 31 bit ESA. This option 456 (and some other stuff like libraries and such) is needed for 457 executing 31 bit applications. 458 459 If unsure say N. 460 461config SMP 462 def_bool y 463 464config NR_CPUS 465 int "Maximum number of CPUs (2-512)" 466 range 2 512 467 default "64" 468 help 469 This allows you to specify the maximum number of CPUs which this 470 kernel will support. The maximum supported value is 512 and the 471 minimum value which makes sense is 2. 472 473 This is purely to save memory - each supported CPU adds 474 approximately sixteen kilobytes to the kernel image. 475 476config HOTPLUG_CPU 477 def_bool y 478 479config NUMA 480 bool "NUMA support" 481 depends on SCHED_TOPOLOGY 482 default n 483 help 484 Enable NUMA support 485 486 This option adds NUMA support to the kernel. 487 488config NODES_SHIFT 489 int 490 depends on NUMA 491 default "1" 492 493config SCHED_SMT 494 def_bool n 495 496config SCHED_MC 497 def_bool n 498 499config SCHED_TOPOLOGY 500 def_bool y 501 prompt "Topology scheduler support" 502 select SCHED_SMT 503 select SCHED_MC 504 help 505 Topology scheduler support improves the CPU scheduler's decision 506 making when dealing with machines that have multi-threading, 507 multiple cores or multiple books. 508 509source "kernel/Kconfig.hz" 510 511config CERT_STORE 512 bool "Get user certificates via DIAG320" 513 depends on KEYS 514 select CRYPTO_LIB_SHA256 515 help 516 Enable this option if you want to access user-provided secure boot 517 certificates via DIAG 0x320. 518 519 These certificates will be made available via the keyring named 520 'cert_store'. 521 522config KERNEL_NOBP 523 def_bool n 524 prompt "Enable modified branch prediction for the kernel by default" 525 help 526 If this option is selected the kernel will switch to a modified 527 branch prediction mode if the firmware interface is available. 528 The modified branch prediction mode improves the behaviour in 529 regard to speculative execution. 530 531 With the option enabled the kernel parameter "nobp=0" or "nospec" 532 can be used to run the kernel in the normal branch prediction mode. 533 534 With the option disabled the modified branch prediction mode is 535 enabled with the "nobp=1" kernel parameter. 536 537 If unsure, say N. 538 539config EXPOLINE 540 def_bool n 541 depends on $(cc-option,-mindirect-branch=thunk) 542 prompt "Avoid speculative indirect branches in the kernel" 543 help 544 Compile the kernel with the expoline compiler options to guard 545 against kernel-to-user data leaks by avoiding speculative indirect 546 branches. 547 Requires a compiler with -mindirect-branch=thunk support for full 548 protection. The kernel may run slower. 549 550 If unsure, say N. 551 552config EXPOLINE_EXTERN 553 def_bool n 554 depends on EXPOLINE 555 depends on CC_IS_GCC && GCC_VERSION >= 110200 556 depends on $(success,$(srctree)/arch/s390/tools/gcc-thunk-extern.sh $(CC)) 557 prompt "Generate expolines as extern functions." 558 help 559 This option is required for some tooling like kpatch. The kernel is 560 compiled with -mindirect-branch=thunk-extern and requires a newer 561 compiler. 562 563 If unsure, say N. 564 565choice 566 prompt "Expoline default" 567 depends on EXPOLINE 568 default EXPOLINE_FULL 569 570config EXPOLINE_OFF 571 bool "spectre_v2=off" 572 573config EXPOLINE_AUTO 574 bool "spectre_v2=auto" 575 576config EXPOLINE_FULL 577 bool "spectre_v2=on" 578 579endchoice 580 581config RELOCATABLE 582 def_bool y 583 help 584 This builds a kernel image that retains relocation information 585 so it can be loaded at an arbitrary address. 586 The kernel is linked as a position-independent executable (PIE) 587 and contains dynamic relocations which are processed early in the 588 bootup process. 589 The relocations make the kernel image about 15% larger (compressed 590 10%), but are discarded at runtime. 591 Note: this option exists only for documentation purposes, please do 592 not remove it. 593 594config RANDOMIZE_BASE 595 bool "Randomize the address of the kernel image (KASLR)" 596 default y 597 help 598 In support of Kernel Address Space Layout Randomization (KASLR), 599 this randomizes the address at which the kernel image is loaded, 600 as a security feature that deters exploit attempts relying on 601 knowledge of the location of kernel internals. 602 603endmenu 604 605menu "Memory setup" 606 607config ARCH_SPARSEMEM_ENABLE 608 def_bool y 609 select SPARSEMEM_VMEMMAP_ENABLE 610 select SPARSEMEM_VMEMMAP 611 612config ARCH_SPARSEMEM_DEFAULT 613 def_bool y 614 615config MAX_PHYSMEM_BITS 616 int "Maximum size of supported physical memory in bits (42-53)" 617 range 42 53 618 default "46" 619 help 620 This option specifies the maximum supported size of physical memory 621 in bits. Supported is any size between 2^42 (4TB) and 2^53 (8PB). 622 Increasing the number of bits also increases the kernel image size. 623 By default 46 bits (64TB) are supported. 624 625config CHECK_STACK 626 def_bool y 627 depends on !VMAP_STACK 628 prompt "Detect kernel stack overflow" 629 help 630 This option enables the compiler option -mstack-guard and 631 -mstack-size if they are available. If the compiler supports them 632 it will emit additional code to each function prolog to trigger 633 an illegal operation if the kernel stack is about to overflow. 634 635 Say N if you are unsure. 636 637config STACK_GUARD 638 int "Size of the guard area (128-1024)" 639 range 128 1024 640 depends on CHECK_STACK 641 default "256" 642 help 643 This allows you to specify the size of the guard area at the lower 644 end of the kernel stack. If the kernel stack points into the guard 645 area on function entry an illegal operation is triggered. The size 646 needs to be a power of 2. Please keep in mind that the size of an 647 interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit. 648 The minimum size for the stack guard should be 256 for 31 bit and 649 512 for 64 bit. 650 651endmenu 652 653menu "I/O subsystem" 654 655config QDIO 656 def_tristate y 657 prompt "QDIO support" 658 help 659 This driver provides the Queued Direct I/O base support for 660 IBM System z. 661 662 To compile this driver as a module, choose M here: the 663 module will be called qdio. 664 665 If unsure, say Y. 666 667if PCI 668 669config PCI_NR_FUNCTIONS 670 int "Maximum number of PCI functions (1-4096)" 671 range 1 4096 672 default "512" 673 help 674 This allows you to specify the maximum number of PCI functions which 675 this kernel will support. 676 677endif # PCI 678 679config HAS_IOMEM 680 def_bool PCI 681 682config CHSC_SCH 683 def_tristate m 684 prompt "Support for CHSC subchannels" 685 help 686 This driver allows usage of CHSC subchannels. A CHSC subchannel 687 is usually present on LPAR only. 688 The driver creates a device /dev/chsc, which may be used to 689 obtain I/O configuration information about the machine and 690 to issue asynchronous chsc commands (DANGEROUS). 691 You will usually only want to use this interface on a special 692 LPAR designated for system management. 693 694 To compile this driver as a module, choose M here: the 695 module will be called chsc_sch. 696 697 If unsure, say N. 698 699config SCM_BUS 700 def_bool y 701 prompt "SCM bus driver" 702 help 703 Bus driver for Storage Class Memory. 704 705config EADM_SCH 706 def_tristate m 707 prompt "Support for EADM subchannels" 708 depends on SCM_BUS 709 help 710 This driver allows usage of EADM subchannels. EADM subchannels act 711 as a communication vehicle for SCM increments. 712 713 To compile this driver as a module, choose M here: the 714 module will be called eadm_sch. 715 716config VFIO_CCW 717 def_tristate n 718 prompt "Support for VFIO-CCW subchannels" 719 depends on VFIO 720 select VFIO_MDEV 721 help 722 This driver allows usage of I/O subchannels via VFIO-CCW. 723 724 To compile this driver as a module, choose M here: the 725 module will be called vfio_ccw. 726 727config VFIO_AP 728 def_tristate n 729 prompt "VFIO support for AP devices" 730 depends on KVM 731 depends on VFIO 732 depends on ZCRYPT 733 select VFIO_MDEV 734 help 735 This driver grants access to Adjunct Processor (AP) devices 736 via the VFIO mediated device interface. 737 738 To compile this driver as a module, choose M here: the module 739 will be called vfio_ap. 740 741endmenu 742 743config CCW 744 def_bool y 745 746config HAVE_PNETID 747 tristate 748 default (SMC || CCWGROUP) 749 750menu "Virtualization" 751 752config PROTECTED_VIRTUALIZATION_GUEST 753 def_bool n 754 prompt "Protected virtualization guest support" 755 help 756 Select this option, if you want to be able to run this 757 kernel as a protected virtualization KVM guest. 758 Protected virtualization capable machines have a mini hypervisor 759 located at machine level (an ultravisor). With help of the 760 Ultravisor, KVM will be able to run "protected" VMs, special 761 VMs whose memory and management data are unavailable to KVM. 762 763config PFAULT 764 def_bool y 765 prompt "Pseudo page fault support" 766 help 767 Select this option, if you want to use PFAULT pseudo page fault 768 handling under VM. If running native or in LPAR, this option 769 has no effect. If your VM does not support PFAULT, PAGEEX 770 pseudo page fault handling will be used. 771 Note that VM 4.2 supports PFAULT but has a bug in its 772 implementation that causes some problems. 773 Everybody who wants to run Linux under VM != VM4.2 should select 774 this option. 775 776config CMM 777 def_tristate n 778 prompt "Cooperative memory management" 779 help 780 Select this option, if you want to enable the kernel interface 781 to reduce the memory size of the system. This is accomplished 782 by allocating pages of memory and put them "on hold". This only 783 makes sense for a system running under VM where the unused pages 784 will be reused by VM for other guest systems. The interface 785 allows an external monitor to balance memory of many systems. 786 Everybody who wants to run Linux under VM should select this 787 option. 788 789config CMM_IUCV 790 def_bool y 791 prompt "IUCV special message interface to cooperative memory management" 792 depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV) 793 help 794 Select this option to enable the special message interface to 795 the cooperative memory management. 796 797config APPLDATA_BASE 798 def_bool n 799 prompt "Linux - VM Monitor Stream, base infrastructure" 800 depends on PROC_SYSCTL 801 help 802 This provides a kernel interface for creating and updating z/VM APPLDATA 803 monitor records. The monitor records are updated at certain time 804 intervals, once the timer is started. 805 Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer, 806 i.e. enables or disables monitoring on the Linux side. 807 A custom interval value (in seconds) can be written to 808 /proc/appldata/interval. 809 810 Defaults are 60 seconds interval and timer off. 811 The /proc entries can also be read from, showing the current settings. 812 813config APPLDATA_MEM 814 def_tristate m 815 prompt "Monitor memory management statistics" 816 depends on APPLDATA_BASE && VM_EVENT_COUNTERS 817 help 818 This provides memory management related data to the Linux - VM Monitor 819 Stream, like paging/swapping rate, memory utilisation, etc. 820 Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM 821 APPLDATA monitor record, i.e. enables or disables monitoring this record 822 on the z/VM side. 823 824 Default is disabled. 825 The /proc entry can also be read from, showing the current settings. 826 827 This can also be compiled as a module, which will be called 828 appldata_mem.o. 829 830config APPLDATA_OS 831 def_tristate m 832 prompt "Monitor OS statistics" 833 depends on APPLDATA_BASE 834 help 835 This provides OS related data to the Linux - VM Monitor Stream, like 836 CPU utilisation, etc. 837 Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM 838 APPLDATA monitor record, i.e. enables or disables monitoring this record 839 on the z/VM side. 840 841 Default is disabled. 842 This can also be compiled as a module, which will be called 843 appldata_os.o. 844 845config APPLDATA_NET_SUM 846 def_tristate m 847 prompt "Monitor overall network statistics" 848 depends on APPLDATA_BASE && NET 849 help 850 This provides network related data to the Linux - VM Monitor Stream, 851 currently there is only a total sum of network I/O statistics, no 852 per-interface data. 853 Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM 854 APPLDATA monitor record, i.e. enables or disables monitoring this record 855 on the z/VM side. 856 857 Default is disabled. 858 This can also be compiled as a module, which will be called 859 appldata_net_sum.o. 860 861config S390_HYPFS 862 def_bool y 863 prompt "s390 hypervisor information" 864 help 865 This provides several binary files at (debugfs)/s390_hypfs/ to 866 provide accounting information in an s390 hypervisor environment. 867 868config S390_HYPFS_FS 869 def_bool n 870 prompt "s390 hypervisor file system support" 871 select SYS_HYPERVISOR 872 depends on S390_HYPFS 873 help 874 This is a virtual file system intended to provide accounting 875 information in an s390 hypervisor environment. This file system 876 is deprecated and should not be used. 877 878 Say N if you are unsure. 879 880source "arch/s390/kvm/Kconfig" 881 882config S390_GUEST 883 def_bool y 884 prompt "s390 support for virtio devices" 885 select TTY 886 select VIRTUALIZATION 887 select VIRTIO 888 help 889 Enabling this option adds support for virtio based paravirtual device 890 drivers on s390. 891 892 Select this option if you want to run the kernel as a guest under 893 the KVM hypervisor. 894 895endmenu 896 897config S390_MODULES_SANITY_TEST_HELPERS 898 def_bool n 899 900menu "Selftests" 901 902config S390_UNWIND_SELFTEST 903 def_tristate n 904 depends on KUNIT 905 default KUNIT_ALL_TESTS 906 prompt "Test unwind functions" 907 help 908 This option enables s390 specific stack unwinder testing kernel 909 module. This option is not useful for distributions or general 910 kernels, but only for kernel developers working on architecture code. 911 912 Say N if you are unsure. 913 914config S390_KPROBES_SANITY_TEST 915 def_tristate n 916 prompt "Enable s390 specific kprobes tests" 917 depends on KPROBES 918 depends on KUNIT 919 help 920 This option enables an s390 specific kprobes test module. This option 921 is not useful for distributions or general kernels, but only for kernel 922 developers working on architecture code. 923 924 Say N if you are unsure. 925 926config S390_MODULES_SANITY_TEST 927 def_tristate n 928 depends on KUNIT 929 default KUNIT_ALL_TESTS 930 prompt "Enable s390 specific modules tests" 931 select S390_MODULES_SANITY_TEST_HELPERS 932 help 933 This option enables an s390 specific modules test. This option is 934 not useful for distributions or general kernels, but only for 935 kernel developers working on architecture code. 936 937 Say N if you are unsure. 938endmenu 939