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_NO_INSTR 127 select ARCH_WANT_DEFAULT_BPF_JIT 128 select ARCH_WANT_IPC_PARSE_VERSION 129 select ARCH_WANT_KERNEL_PMD_MKWRITE 130 select ARCH_WANT_OPTIMIZE_HUGETLB_VMEMMAP 131 select BUILDTIME_TABLE_SORT 132 select CLONE_BACKWARDS2 133 select DCACHE_WORD_ACCESS if !KMSAN 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 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 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 y 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. It is safe to say "Y". 458 459config SMP 460 def_bool y 461 462config NR_CPUS 463 int "Maximum number of CPUs (2-512)" 464 range 2 512 465 default "64" 466 help 467 This allows you to specify the maximum number of CPUs which this 468 kernel will support. The maximum supported value is 512 and the 469 minimum value which makes sense is 2. 470 471 This is purely to save memory - each supported CPU adds 472 approximately sixteen kilobytes to the kernel image. 473 474config HOTPLUG_CPU 475 def_bool y 476 477config NUMA 478 bool "NUMA support" 479 depends on SCHED_TOPOLOGY 480 default n 481 help 482 Enable NUMA support 483 484 This option adds NUMA support to the kernel. 485 486config NODES_SHIFT 487 int 488 depends on NUMA 489 default "1" 490 491config SCHED_SMT 492 def_bool n 493 494config SCHED_MC 495 def_bool n 496 497config SCHED_TOPOLOGY 498 def_bool y 499 prompt "Topology scheduler support" 500 select SCHED_SMT 501 select SCHED_MC 502 help 503 Topology scheduler support improves the CPU scheduler's decision 504 making when dealing with machines that have multi-threading, 505 multiple cores or multiple books. 506 507source "kernel/Kconfig.hz" 508 509config CERT_STORE 510 bool "Get user certificates via DIAG320" 511 depends on KEYS 512 select CRYPTO_LIB_SHA256 513 help 514 Enable this option if you want to access user-provided secure boot 515 certificates via DIAG 0x320. 516 517 These certificates will be made available via the keyring named 518 'cert_store'. 519 520config KERNEL_NOBP 521 def_bool n 522 prompt "Enable modified branch prediction for the kernel by default" 523 help 524 If this option is selected the kernel will switch to a modified 525 branch prediction mode if the firmware interface is available. 526 The modified branch prediction mode improves the behaviour in 527 regard to speculative execution. 528 529 With the option enabled the kernel parameter "nobp=0" or "nospec" 530 can be used to run the kernel in the normal branch prediction mode. 531 532 With the option disabled the modified branch prediction mode is 533 enabled with the "nobp=1" kernel parameter. 534 535 If unsure, say N. 536 537config EXPOLINE 538 def_bool n 539 depends on $(cc-option,-mindirect-branch=thunk) 540 prompt "Avoid speculative indirect branches in the kernel" 541 help 542 Compile the kernel with the expoline compiler options to guard 543 against kernel-to-user data leaks by avoiding speculative indirect 544 branches. 545 Requires a compiler with -mindirect-branch=thunk support for full 546 protection. The kernel may run slower. 547 548 If unsure, say N. 549 550config EXPOLINE_EXTERN 551 def_bool n 552 depends on EXPOLINE 553 depends on CC_IS_GCC && GCC_VERSION >= 110200 554 depends on $(success,$(srctree)/arch/s390/tools/gcc-thunk-extern.sh $(CC)) 555 prompt "Generate expolines as extern functions." 556 help 557 This option is required for some tooling like kpatch. The kernel is 558 compiled with -mindirect-branch=thunk-extern and requires a newer 559 compiler. 560 561 If unsure, say N. 562 563choice 564 prompt "Expoline default" 565 depends on EXPOLINE 566 default EXPOLINE_FULL 567 568config EXPOLINE_OFF 569 bool "spectre_v2=off" 570 571config EXPOLINE_AUTO 572 bool "spectre_v2=auto" 573 574config EXPOLINE_FULL 575 bool "spectre_v2=on" 576 577endchoice 578 579config RELOCATABLE 580 def_bool y 581 help 582 This builds a kernel image that retains relocation information 583 so it can be loaded at an arbitrary address. 584 The kernel is linked as a position-independent executable (PIE) 585 and contains dynamic relocations which are processed early in the 586 bootup process. 587 The relocations make the kernel image about 15% larger (compressed 588 10%), but are discarded at runtime. 589 Note: this option exists only for documentation purposes, please do 590 not remove it. 591 592config RANDOMIZE_BASE 593 bool "Randomize the address of the kernel image (KASLR)" 594 default y 595 help 596 In support of Kernel Address Space Layout Randomization (KASLR), 597 this randomizes the address at which the kernel image is loaded, 598 as a security feature that deters exploit attempts relying on 599 knowledge of the location of kernel internals. 600 601endmenu 602 603menu "Memory setup" 604 605config ARCH_SPARSEMEM_ENABLE 606 def_bool y 607 select SPARSEMEM_VMEMMAP_ENABLE 608 select SPARSEMEM_VMEMMAP 609 610config ARCH_SPARSEMEM_DEFAULT 611 def_bool y 612 613config MAX_PHYSMEM_BITS 614 int "Maximum size of supported physical memory in bits (42-53)" 615 range 42 53 616 default "46" 617 help 618 This option specifies the maximum supported size of physical memory 619 in bits. Supported is any size between 2^42 (4TB) and 2^53 (8PB). 620 Increasing the number of bits also increases the kernel image size. 621 By default 46 bits (64TB) are supported. 622 623config CHECK_STACK 624 def_bool y 625 depends on !VMAP_STACK 626 prompt "Detect kernel stack overflow" 627 help 628 This option enables the compiler option -mstack-guard and 629 -mstack-size if they are available. If the compiler supports them 630 it will emit additional code to each function prolog to trigger 631 an illegal operation if the kernel stack is about to overflow. 632 633 Say N if you are unsure. 634 635config STACK_GUARD 636 int "Size of the guard area (128-1024)" 637 range 128 1024 638 depends on CHECK_STACK 639 default "256" 640 help 641 This allows you to specify the size of the guard area at the lower 642 end of the kernel stack. If the kernel stack points into the guard 643 area on function entry an illegal operation is triggered. The size 644 needs to be a power of 2. Please keep in mind that the size of an 645 interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit. 646 The minimum size for the stack guard should be 256 for 31 bit and 647 512 for 64 bit. 648 649endmenu 650 651menu "I/O subsystem" 652 653config QDIO 654 def_tristate y 655 prompt "QDIO support" 656 help 657 This driver provides the Queued Direct I/O base support for 658 IBM System z. 659 660 To compile this driver as a module, choose M here: the 661 module will be called qdio. 662 663 If unsure, say Y. 664 665if PCI 666 667config PCI_NR_FUNCTIONS 668 int "Maximum number of PCI functions (1-4096)" 669 range 1 4096 670 default "512" 671 help 672 This allows you to specify the maximum number of PCI functions which 673 this kernel will support. 674 675endif # PCI 676 677config HAS_IOMEM 678 def_bool PCI 679 680config CHSC_SCH 681 def_tristate m 682 prompt "Support for CHSC subchannels" 683 help 684 This driver allows usage of CHSC subchannels. A CHSC subchannel 685 is usually present on LPAR only. 686 The driver creates a device /dev/chsc, which may be used to 687 obtain I/O configuration information about the machine and 688 to issue asynchronous chsc commands (DANGEROUS). 689 You will usually only want to use this interface on a special 690 LPAR designated for system management. 691 692 To compile this driver as a module, choose M here: the 693 module will be called chsc_sch. 694 695 If unsure, say N. 696 697config SCM_BUS 698 def_bool y 699 prompt "SCM bus driver" 700 help 701 Bus driver for Storage Class Memory. 702 703config EADM_SCH 704 def_tristate m 705 prompt "Support for EADM subchannels" 706 depends on SCM_BUS 707 help 708 This driver allows usage of EADM subchannels. EADM subchannels act 709 as a communication vehicle for SCM increments. 710 711 To compile this driver as a module, choose M here: the 712 module will be called eadm_sch. 713 714config VFIO_CCW 715 def_tristate n 716 prompt "Support for VFIO-CCW subchannels" 717 depends on VFIO 718 select VFIO_MDEV 719 help 720 This driver allows usage of I/O subchannels via VFIO-CCW. 721 722 To compile this driver as a module, choose M here: the 723 module will be called vfio_ccw. 724 725config VFIO_AP 726 def_tristate n 727 prompt "VFIO support for AP devices" 728 depends on KVM 729 depends on VFIO 730 depends on ZCRYPT 731 select VFIO_MDEV 732 help 733 This driver grants access to Adjunct Processor (AP) devices 734 via the VFIO mediated device interface. 735 736 To compile this driver as a module, choose M here: the module 737 will be called vfio_ap. 738 739endmenu 740 741config CCW 742 def_bool y 743 744config HAVE_PNETID 745 tristate 746 default (SMC || CCWGROUP) 747 748menu "Virtualization" 749 750config PROTECTED_VIRTUALIZATION_GUEST 751 def_bool n 752 prompt "Protected virtualization guest support" 753 help 754 Select this option, if you want to be able to run this 755 kernel as a protected virtualization KVM guest. 756 Protected virtualization capable machines have a mini hypervisor 757 located at machine level (an ultravisor). With help of the 758 Ultravisor, KVM will be able to run "protected" VMs, special 759 VMs whose memory and management data are unavailable to KVM. 760 761config PFAULT 762 def_bool y 763 prompt "Pseudo page fault support" 764 help 765 Select this option, if you want to use PFAULT pseudo page fault 766 handling under VM. If running native or in LPAR, this option 767 has no effect. If your VM does not support PFAULT, PAGEEX 768 pseudo page fault handling will be used. 769 Note that VM 4.2 supports PFAULT but has a bug in its 770 implementation that causes some problems. 771 Everybody who wants to run Linux under VM != VM4.2 should select 772 this option. 773 774config CMM 775 def_tristate n 776 prompt "Cooperative memory management" 777 help 778 Select this option, if you want to enable the kernel interface 779 to reduce the memory size of the system. This is accomplished 780 by allocating pages of memory and put them "on hold". This only 781 makes sense for a system running under VM where the unused pages 782 will be reused by VM for other guest systems. The interface 783 allows an external monitor to balance memory of many systems. 784 Everybody who wants to run Linux under VM should select this 785 option. 786 787config CMM_IUCV 788 def_bool y 789 prompt "IUCV special message interface to cooperative memory management" 790 depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV) 791 help 792 Select this option to enable the special message interface to 793 the cooperative memory management. 794 795config APPLDATA_BASE 796 def_bool n 797 prompt "Linux - VM Monitor Stream, base infrastructure" 798 depends on PROC_SYSCTL 799 help 800 This provides a kernel interface for creating and updating z/VM APPLDATA 801 monitor records. The monitor records are updated at certain time 802 intervals, once the timer is started. 803 Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer, 804 i.e. enables or disables monitoring on the Linux side. 805 A custom interval value (in seconds) can be written to 806 /proc/appldata/interval. 807 808 Defaults are 60 seconds interval and timer off. 809 The /proc entries can also be read from, showing the current settings. 810 811config APPLDATA_MEM 812 def_tristate m 813 prompt "Monitor memory management statistics" 814 depends on APPLDATA_BASE && VM_EVENT_COUNTERS 815 help 816 This provides memory management related data to the Linux - VM Monitor 817 Stream, like paging/swapping rate, memory utilisation, etc. 818 Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM 819 APPLDATA monitor record, i.e. enables or disables monitoring this record 820 on the z/VM side. 821 822 Default is disabled. 823 The /proc entry can also be read from, showing the current settings. 824 825 This can also be compiled as a module, which will be called 826 appldata_mem.o. 827 828config APPLDATA_OS 829 def_tristate m 830 prompt "Monitor OS statistics" 831 depends on APPLDATA_BASE 832 help 833 This provides OS related data to the Linux - VM Monitor Stream, like 834 CPU utilisation, etc. 835 Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM 836 APPLDATA monitor record, i.e. enables or disables monitoring this record 837 on the z/VM side. 838 839 Default is disabled. 840 This can also be compiled as a module, which will be called 841 appldata_os.o. 842 843config APPLDATA_NET_SUM 844 def_tristate m 845 prompt "Monitor overall network statistics" 846 depends on APPLDATA_BASE && NET 847 help 848 This provides network related data to the Linux - VM Monitor Stream, 849 currently there is only a total sum of network I/O statistics, no 850 per-interface data. 851 Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM 852 APPLDATA monitor record, i.e. enables or disables monitoring this record 853 on the z/VM side. 854 855 Default is disabled. 856 This can also be compiled as a module, which will be called 857 appldata_net_sum.o. 858 859config S390_HYPFS 860 def_bool y 861 prompt "s390 hypervisor information" 862 help 863 This provides several binary files at (debugfs)/s390_hypfs/ to 864 provide accounting information in an s390 hypervisor environment. 865 866config S390_HYPFS_FS 867 def_bool n 868 prompt "s390 hypervisor file system support" 869 select SYS_HYPERVISOR 870 depends on S390_HYPFS 871 help 872 This is a virtual file system intended to provide accounting 873 information in an s390 hypervisor environment. This file system 874 is deprecated and should not be used. 875 876 Say N if you are unsure. 877 878source "arch/s390/kvm/Kconfig" 879 880config S390_GUEST 881 def_bool y 882 prompt "s390 support for virtio devices" 883 select TTY 884 select VIRTUALIZATION 885 select VIRTIO 886 help 887 Enabling this option adds support for virtio based paravirtual device 888 drivers on s390. 889 890 Select this option if you want to run the kernel as a guest under 891 the KVM hypervisor. 892 893endmenu 894 895config S390_MODULES_SANITY_TEST_HELPERS 896 def_bool n 897 898menu "Selftests" 899 900config S390_UNWIND_SELFTEST 901 def_tristate n 902 depends on KUNIT 903 default KUNIT_ALL_TESTS 904 prompt "Test unwind functions" 905 help 906 This option enables s390 specific stack unwinder testing kernel 907 module. This option is not useful for distributions or general 908 kernels, but only for kernel developers working on architecture code. 909 910 Say N if you are unsure. 911 912config S390_KPROBES_SANITY_TEST 913 def_tristate n 914 prompt "Enable s390 specific kprobes tests" 915 depends on KPROBES 916 depends on KUNIT 917 help 918 This option enables an s390 specific kprobes test module. This option 919 is not useful for distributions or general kernels, but only for kernel 920 developers working on architecture code. 921 922 Say N if you are unsure. 923 924config S390_MODULES_SANITY_TEST 925 def_tristate n 926 depends on KUNIT 927 default KUNIT_ALL_TESTS 928 prompt "Enable s390 specific modules tests" 929 select S390_MODULES_SANITY_TEST_HELPERS 930 help 931 This option enables an s390 specific modules test. This option is 932 not useful for distributions or general kernels, but only for 933 kernel developers working on architecture code. 934 935 Say N if you are unsure. 936endmenu 937