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_STACKWALK 117 select ARCH_SUPPORTS_ATOMIC_RMW 118 select ARCH_SUPPORTS_DEBUG_PAGEALLOC 119 select ARCH_SUPPORTS_HUGETLBFS 120 select ARCH_SUPPORTS_INT128 if CC_HAS_INT128 && CC_IS_CLANG 121 select ARCH_SUPPORTS_NUMA_BALANCING 122 select ARCH_SUPPORTS_PER_VMA_LOCK 123 select ARCH_USE_BUILTIN_BSWAP 124 select ARCH_USE_CMPXCHG_LOCKREF 125 select ARCH_USE_SYM_ANNOTATIONS 126 select ARCH_WANTS_DYNAMIC_TASK_STRUCT 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 DMA_OPS if PCI 135 select DYNAMIC_FTRACE if FUNCTION_TRACER 136 select FUNCTION_ALIGNMENT_8B if CC_IS_GCC 137 select FUNCTION_ALIGNMENT_16B if !CC_IS_GCC 138 select GENERIC_ALLOCATOR 139 select GENERIC_CPU_AUTOPROBE 140 select GENERIC_CPU_VULNERABILITIES 141 select GENERIC_ENTRY 142 select GENERIC_GETTIMEOFDAY 143 select GENERIC_PTDUMP 144 select GENERIC_SMP_IDLE_THREAD 145 select GENERIC_TIME_VSYSCALL 146 select GENERIC_VDSO_TIME_NS 147 select GENERIC_IOREMAP if PCI 148 select HAVE_ALIGNED_STRUCT_PAGE if SLUB 149 select HAVE_ARCH_AUDITSYSCALL 150 select HAVE_ARCH_JUMP_LABEL 151 select HAVE_ARCH_JUMP_LABEL_RELATIVE 152 select HAVE_ARCH_KASAN 153 select HAVE_ARCH_KASAN_VMALLOC 154 select HAVE_ARCH_KCSAN 155 select HAVE_ARCH_KFENCE 156 select HAVE_ARCH_RANDOMIZE_KSTACK_OFFSET 157 select HAVE_ARCH_SECCOMP_FILTER 158 select HAVE_ARCH_SOFT_DIRTY 159 select HAVE_ARCH_STACKLEAK 160 select HAVE_ARCH_TRACEHOOK 161 select HAVE_ARCH_TRANSPARENT_HUGEPAGE 162 select HAVE_ARCH_VMAP_STACK 163 select HAVE_ASM_MODVERSIONS 164 select HAVE_CMPXCHG_DOUBLE 165 select HAVE_CMPXCHG_LOCAL 166 select HAVE_DEBUG_KMEMLEAK 167 select HAVE_DMA_CONTIGUOUS 168 select HAVE_DYNAMIC_FTRACE 169 select HAVE_DYNAMIC_FTRACE_WITH_ARGS 170 select HAVE_DYNAMIC_FTRACE_WITH_DIRECT_CALLS 171 select HAVE_DYNAMIC_FTRACE_WITH_REGS 172 select HAVE_EBPF_JIT if HAVE_MARCH_Z196_FEATURES 173 select HAVE_EFFICIENT_UNALIGNED_ACCESS 174 select HAVE_FAST_GUP 175 select HAVE_FENTRY 176 select HAVE_FTRACE_MCOUNT_RECORD 177 select HAVE_FUNCTION_ARG_ACCESS_API 178 select HAVE_FUNCTION_ERROR_INJECTION 179 select HAVE_FUNCTION_GRAPH_RETVAL 180 select HAVE_FUNCTION_GRAPH_TRACER 181 select HAVE_FUNCTION_TRACER 182 select HAVE_GCC_PLUGINS 183 select HAVE_GENERIC_VDSO 184 select HAVE_IOREMAP_PROT if PCI 185 select HAVE_KERNEL_BZIP2 186 select HAVE_KERNEL_GZIP 187 select HAVE_KERNEL_LZ4 188 select HAVE_KERNEL_LZMA 189 select HAVE_KERNEL_LZO 190 select HAVE_KERNEL_UNCOMPRESSED 191 select HAVE_KERNEL_XZ 192 select HAVE_KERNEL_ZSTD 193 select HAVE_KPROBES 194 select HAVE_KPROBES_ON_FTRACE 195 select HAVE_KRETPROBES 196 select HAVE_KVM 197 select HAVE_LIVEPATCH 198 select HAVE_MEMBLOCK_PHYS_MAP 199 select HAVE_MOD_ARCH_SPECIFIC 200 select HAVE_NMI 201 select HAVE_NOP_MCOUNT 202 select HAVE_PCI 203 select HAVE_PERF_EVENTS 204 select HAVE_PERF_REGS 205 select HAVE_PERF_USER_STACK_DUMP 206 select HAVE_REGS_AND_STACK_ACCESS_API 207 select HAVE_RELIABLE_STACKTRACE 208 select HAVE_RETHOOK 209 select HAVE_RSEQ 210 select HAVE_SAMPLE_FTRACE_DIRECT 211 select HAVE_SAMPLE_FTRACE_DIRECT_MULTI 212 select HAVE_SETUP_PER_CPU_AREA 213 select HAVE_SOFTIRQ_ON_OWN_STACK 214 select HAVE_SYSCALL_TRACEPOINTS 215 select HAVE_VIRT_CPU_ACCOUNTING 216 select HAVE_VIRT_CPU_ACCOUNTING_IDLE 217 select IOMMU_HELPER if PCI 218 select IOMMU_SUPPORT if PCI 219 select KEXEC 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 VIRT_CPU_ACCOUNTING 239 select ZONE_DMA 240 # Note: keep the above list sorted alphabetically 241 242config SCHED_OMIT_FRAME_POINTER 243 def_bool y 244 245config PGTABLE_LEVELS 246 int 247 default 5 248 249source "kernel/livepatch/Kconfig" 250 251config ARCH_SUPPORTS_KEXEC 252 def_bool y 253 254config ARCH_SUPPORTS_KEXEC_FILE 255 def_bool y 256 257config ARCH_SUPPORTS_KEXEC_SIG 258 def_bool MODULE_SIG_FORMAT 259 260config ARCH_SUPPORTS_KEXEC_PURGATORY 261 def_bool y 262 263config ARCH_SUPPORTS_CRASH_DUMP 264 def_bool y 265 help 266 Refer to <file:Documentation/arch/s390/zfcpdump.rst> for more details on this. 267 This option also enables s390 zfcpdump. 268 See also <file:Documentation/arch/s390/zfcpdump.rst> 269 270menu "Processor type and features" 271 272config HAVE_MARCH_Z10_FEATURES 273 def_bool n 274 275config HAVE_MARCH_Z196_FEATURES 276 def_bool n 277 select HAVE_MARCH_Z10_FEATURES 278 279config HAVE_MARCH_ZEC12_FEATURES 280 def_bool n 281 select HAVE_MARCH_Z196_FEATURES 282 283config HAVE_MARCH_Z13_FEATURES 284 def_bool n 285 select HAVE_MARCH_ZEC12_FEATURES 286 287config HAVE_MARCH_Z14_FEATURES 288 def_bool n 289 select HAVE_MARCH_Z13_FEATURES 290 291config HAVE_MARCH_Z15_FEATURES 292 def_bool n 293 select HAVE_MARCH_Z14_FEATURES 294 295config HAVE_MARCH_Z16_FEATURES 296 def_bool n 297 select HAVE_MARCH_Z15_FEATURES 298 299choice 300 prompt "Processor type" 301 default MARCH_Z196 302 303config MARCH_Z10 304 bool "IBM System z10" 305 select HAVE_MARCH_Z10_FEATURES 306 depends on $(cc-option,-march=z10) 307 help 308 Select this to enable optimizations for IBM System z10 (2097 and 2098 309 series). This is the oldest machine generation currently supported. 310 311config MARCH_Z196 312 bool "IBM zEnterprise 114 and 196" 313 select HAVE_MARCH_Z196_FEATURES 314 depends on $(cc-option,-march=z196) 315 help 316 Select this to enable optimizations for IBM zEnterprise 114 and 196 317 (2818 and 2817 series). The kernel will be slightly faster but will 318 not work on older machines. 319 320config MARCH_ZEC12 321 bool "IBM zBC12 and zEC12" 322 select HAVE_MARCH_ZEC12_FEATURES 323 depends on $(cc-option,-march=zEC12) 324 help 325 Select this to enable optimizations for IBM zBC12 and zEC12 (2828 and 326 2827 series). The kernel will be slightly faster but will not work on 327 older machines. 328 329config MARCH_Z13 330 bool "IBM z13s and z13" 331 select HAVE_MARCH_Z13_FEATURES 332 depends on $(cc-option,-march=z13) 333 help 334 Select this to enable optimizations for IBM z13s and z13 (2965 and 335 2964 series). The kernel will be slightly faster but will not work on 336 older machines. 337 338config MARCH_Z14 339 bool "IBM z14 ZR1 and z14" 340 select HAVE_MARCH_Z14_FEATURES 341 depends on $(cc-option,-march=z14) 342 help 343 Select this to enable optimizations for IBM z14 ZR1 and z14 (3907 344 and 3906 series). The kernel will be slightly faster but will not 345 work on older machines. 346 347config MARCH_Z15 348 bool "IBM z15" 349 select HAVE_MARCH_Z15_FEATURES 350 depends on $(cc-option,-march=z15) 351 help 352 Select this to enable optimizations for IBM z15 (8562 353 and 8561 series). The kernel will be slightly faster but will not 354 work on older machines. 355 356config MARCH_Z16 357 bool "IBM z16" 358 select HAVE_MARCH_Z16_FEATURES 359 depends on $(cc-option,-march=z16) 360 help 361 Select this to enable optimizations for IBM z16 (3931 and 362 3932 series). 363 364endchoice 365 366config MARCH_Z10_TUNE 367 def_bool TUNE_Z10 || MARCH_Z10 && TUNE_DEFAULT 368 369config MARCH_Z196_TUNE 370 def_bool TUNE_Z196 || MARCH_Z196 && TUNE_DEFAULT 371 372config MARCH_ZEC12_TUNE 373 def_bool TUNE_ZEC12 || MARCH_ZEC12 && TUNE_DEFAULT 374 375config MARCH_Z13_TUNE 376 def_bool TUNE_Z13 || MARCH_Z13 && TUNE_DEFAULT 377 378config MARCH_Z14_TUNE 379 def_bool TUNE_Z14 || MARCH_Z14 && TUNE_DEFAULT 380 381config MARCH_Z15_TUNE 382 def_bool TUNE_Z15 || MARCH_Z15 && TUNE_DEFAULT 383 384config MARCH_Z16_TUNE 385 def_bool TUNE_Z16 || MARCH_Z16 && TUNE_DEFAULT 386 387choice 388 prompt "Tune code generation" 389 default TUNE_DEFAULT 390 help 391 Cause the compiler to tune (-mtune) the generated code for a machine. 392 This will make the code run faster on the selected machine but 393 somewhat slower on other machines. 394 This option only changes how the compiler emits instructions, not the 395 selection of instructions itself, so the resulting kernel will run on 396 all other machines. 397 398config TUNE_DEFAULT 399 bool "Default" 400 help 401 Tune the generated code for the target processor for which the kernel 402 will be compiled. 403 404config TUNE_Z10 405 bool "IBM System z10" 406 407config TUNE_Z196 408 bool "IBM zEnterprise 114 and 196" 409 depends on $(cc-option,-mtune=z196) 410 411config TUNE_ZEC12 412 bool "IBM zBC12 and zEC12" 413 depends on $(cc-option,-mtune=zEC12) 414 415config TUNE_Z13 416 bool "IBM z13s and z13" 417 depends on $(cc-option,-mtune=z13) 418 419config TUNE_Z14 420 bool "IBM z14 ZR1 and z14" 421 depends on $(cc-option,-mtune=z14) 422 423config TUNE_Z15 424 bool "IBM z15" 425 depends on $(cc-option,-mtune=z15) 426 427config TUNE_Z16 428 bool "IBM z16" 429 depends on $(cc-option,-mtune=z16) 430 431endchoice 432 433config 64BIT 434 def_bool y 435 436config COMMAND_LINE_SIZE 437 int "Maximum size of kernel command line" 438 default 4096 439 range 896 1048576 440 help 441 This allows you to specify the maximum length of the kernel command 442 line. 443 444config COMPAT 445 def_bool y 446 prompt "Kernel support for 31 bit emulation" 447 select ARCH_WANT_OLD_COMPAT_IPC 448 select COMPAT_OLD_SIGACTION 449 select HAVE_UID16 450 depends on MULTIUSER 451 depends on !CC_IS_CLANG 452 help 453 Select this option if you want to enable your system kernel to 454 handle system-calls from ELF binaries for 31 bit ESA. This option 455 (and some other stuff like libraries and such) is needed for 456 executing 31 bit applications. It is safe to say "Y". 457 458config SMP 459 def_bool y 460 461config NR_CPUS 462 int "Maximum number of CPUs (2-512)" 463 range 2 512 464 default "64" 465 help 466 This allows you to specify the maximum number of CPUs which this 467 kernel will support. The maximum supported value is 512 and the 468 minimum value which makes sense is 2. 469 470 This is purely to save memory - each supported CPU adds 471 approximately sixteen kilobytes to the kernel image. 472 473config HOTPLUG_CPU 474 def_bool y 475 476config NUMA 477 bool "NUMA support" 478 depends on SCHED_TOPOLOGY 479 default n 480 help 481 Enable NUMA support 482 483 This option adds NUMA support to the kernel. 484 485config NODES_SHIFT 486 int 487 depends on NUMA 488 default "1" 489 490config SCHED_SMT 491 def_bool n 492 493config SCHED_MC 494 def_bool n 495 496config SCHED_TOPOLOGY 497 def_bool y 498 prompt "Topology scheduler support" 499 select SCHED_SMT 500 select SCHED_MC 501 help 502 Topology scheduler support improves the CPU scheduler's decision 503 making when dealing with machines that have multi-threading, 504 multiple cores or multiple books. 505 506source "kernel/Kconfig.hz" 507 508config CERT_STORE 509 bool "Get user certificates via DIAG320" 510 depends on KEYS 511 select CRYPTO_LIB_SHA256 512 help 513 Enable this option if you want to access user-provided secure boot 514 certificates via DIAG 0x320. 515 516 These certificates will be made available via the keyring named 517 'cert_store'. 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 VFIO 717 select VFIO_MDEV 718 help 719 This driver allows usage of I/O subchannels via VFIO-CCW. 720 721 To compile this driver as a module, choose M here: the 722 module will be called vfio_ccw. 723 724config VFIO_AP 725 def_tristate n 726 prompt "VFIO support for AP devices" 727 depends on KVM 728 depends on VFIO 729 depends on ZCRYPT 730 select VFIO_MDEV 731 help 732 This driver grants access to Adjunct Processor (AP) devices 733 via the VFIO mediated device interface. 734 735 To compile this driver as a module, choose M here: the module 736 will be called vfio_ap. 737 738endmenu 739 740config CCW 741 def_bool y 742 743config HAVE_PNETID 744 tristate 745 default (SMC || CCWGROUP) 746 747menu "Virtualization" 748 749config PROTECTED_VIRTUALIZATION_GUEST 750 def_bool n 751 prompt "Protected virtualization guest support" 752 help 753 Select this option, if you want to be able to run this 754 kernel as a protected virtualization KVM guest. 755 Protected virtualization capable machines have a mini hypervisor 756 located at machine level (an ultravisor). With help of the 757 Ultravisor, KVM will be able to run "protected" VMs, special 758 VMs whose memory and management data are unavailable to KVM. 759 760config PFAULT 761 def_bool y 762 prompt "Pseudo page fault support" 763 help 764 Select this option, if you want to use PFAULT pseudo page fault 765 handling under VM. If running native or in LPAR, this option 766 has no effect. If your VM does not support PFAULT, PAGEEX 767 pseudo page fault handling will be used. 768 Note that VM 4.2 supports PFAULT but has a bug in its 769 implementation that causes some problems. 770 Everybody who wants to run Linux under VM != VM4.2 should select 771 this option. 772 773config CMM 774 def_tristate n 775 prompt "Cooperative memory management" 776 help 777 Select this option, if you want to enable the kernel interface 778 to reduce the memory size of the system. This is accomplished 779 by allocating pages of memory and put them "on hold". This only 780 makes sense for a system running under VM where the unused pages 781 will be reused by VM for other guest systems. The interface 782 allows an external monitor to balance memory of many systems. 783 Everybody who wants to run Linux under VM should select this 784 option. 785 786config CMM_IUCV 787 def_bool y 788 prompt "IUCV special message interface to cooperative memory management" 789 depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV) 790 help 791 Select this option to enable the special message interface to 792 the cooperative memory management. 793 794config APPLDATA_BASE 795 def_bool n 796 prompt "Linux - VM Monitor Stream, base infrastructure" 797 depends on PROC_SYSCTL 798 help 799 This provides a kernel interface for creating and updating z/VM APPLDATA 800 monitor records. The monitor records are updated at certain time 801 intervals, once the timer is started. 802 Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer, 803 i.e. enables or disables monitoring on the Linux side. 804 A custom interval value (in seconds) can be written to 805 /proc/appldata/interval. 806 807 Defaults are 60 seconds interval and timer off. 808 The /proc entries can also be read from, showing the current settings. 809 810config APPLDATA_MEM 811 def_tristate m 812 prompt "Monitor memory management statistics" 813 depends on APPLDATA_BASE && VM_EVENT_COUNTERS 814 help 815 This provides memory management related data to the Linux - VM Monitor 816 Stream, like paging/swapping rate, memory utilisation, etc. 817 Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM 818 APPLDATA monitor record, i.e. enables or disables monitoring this record 819 on the z/VM side. 820 821 Default is disabled. 822 The /proc entry can also be read from, showing the current settings. 823 824 This can also be compiled as a module, which will be called 825 appldata_mem.o. 826 827config APPLDATA_OS 828 def_tristate m 829 prompt "Monitor OS statistics" 830 depends on APPLDATA_BASE 831 help 832 This provides OS related data to the Linux - VM Monitor Stream, like 833 CPU utilisation, etc. 834 Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM 835 APPLDATA monitor record, i.e. enables or disables monitoring this record 836 on the z/VM side. 837 838 Default is disabled. 839 This can also be compiled as a module, which will be called 840 appldata_os.o. 841 842config APPLDATA_NET_SUM 843 def_tristate m 844 prompt "Monitor overall network statistics" 845 depends on APPLDATA_BASE && NET 846 help 847 This provides network related data to the Linux - VM Monitor Stream, 848 currently there is only a total sum of network I/O statistics, no 849 per-interface data. 850 Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM 851 APPLDATA monitor record, i.e. enables or disables monitoring this record 852 on the z/VM side. 853 854 Default is disabled. 855 This can also be compiled as a module, which will be called 856 appldata_net_sum.o. 857 858config S390_HYPFS 859 def_bool y 860 prompt "s390 hypervisor information" 861 help 862 This provides several binary files at (debugfs)/s390_hypfs/ to 863 provide accounting information in an s390 hypervisor environment. 864 865config S390_HYPFS_FS 866 def_bool n 867 prompt "s390 hypervisor file system support" 868 select SYS_HYPERVISOR 869 depends on S390_HYPFS 870 help 871 This is a virtual file system intended to provide accounting 872 information in an s390 hypervisor environment. This file system 873 is deprecated and should not be used. 874 875 Say N if you are unsure. 876 877source "arch/s390/kvm/Kconfig" 878 879config S390_GUEST 880 def_bool y 881 prompt "s390 support for virtio devices" 882 select TTY 883 select VIRTUALIZATION 884 select VIRTIO 885 help 886 Enabling this option adds support for virtio based paravirtual device 887 drivers on s390. 888 889 Select this option if you want to run the kernel as a guest under 890 the KVM hypervisor. 891 892endmenu 893 894config S390_MODULES_SANITY_TEST_HELPERS 895 def_bool n 896 897menu "Selftests" 898 899config S390_UNWIND_SELFTEST 900 def_tristate n 901 depends on KUNIT 902 default KUNIT_ALL_TESTS 903 prompt "Test unwind functions" 904 help 905 This option enables s390 specific stack unwinder testing kernel 906 module. This option is not useful for distributions or general 907 kernels, but only for kernel developers working on architecture code. 908 909 Say N if you are unsure. 910 911config S390_KPROBES_SANITY_TEST 912 def_tristate n 913 prompt "Enable s390 specific kprobes tests" 914 depends on KPROBES 915 depends on KUNIT 916 help 917 This option enables an s390 specific kprobes test module. This option 918 is not useful for distributions or general kernels, but only for kernel 919 developers working on architecture code. 920 921 Say N if you are unsure. 922 923config S390_MODULES_SANITY_TEST 924 def_tristate n 925 depends on KUNIT 926 default KUNIT_ALL_TESTS 927 prompt "Enable s390 specific modules tests" 928 select S390_MODULES_SANITY_TEST_HELPERS 929 help 930 This option enables an s390 specific modules test. This option is 931 not useful for distributions or general kernels, but only for 932 kernel developers working on architecture code. 933 934 Say N if you are unsure. 935endmenu 936