| # SPDX-License-Identifier: GPL-2.0 |
| config MMU |
| def_bool y |
| |
| config CPU_BIG_ENDIAN |
| def_bool y |
| |
| config LOCKDEP_SUPPORT |
| def_bool y |
| |
| config STACKTRACE_SUPPORT |
| def_bool y |
| |
| config ARCH_HAS_ILOG2_U32 |
| def_bool n |
| |
| config ARCH_HAS_ILOG2_U64 |
| def_bool n |
| |
| config GENERIC_HWEIGHT |
| def_bool y |
| |
| config GENERIC_BUG |
| def_bool y if BUG |
| |
| config GENERIC_BUG_RELATIVE_POINTERS |
| def_bool y |
| |
| config GENERIC_LOCKBREAK |
| def_bool y if PREEMPTION |
| |
| config PGSTE |
| def_bool y if KVM |
| |
| config AUDIT_ARCH |
| def_bool y |
| |
| config NO_IOPORT_MAP |
| def_bool y |
| |
| config PCI_QUIRKS |
| def_bool n |
| |
| config ARCH_SUPPORTS_UPROBES |
| def_bool y |
| |
| config KASAN_SHADOW_OFFSET |
| hex |
| depends on KASAN |
| default 0x18000000000000 |
| |
| config S390 |
| def_bool y |
| # |
| # Note: keep this list sorted alphabetically |
| # |
| imply IMA_SECURE_AND_OR_TRUSTED_BOOT |
| select ARCH_32BIT_USTAT_F_TINODE |
| select ARCH_BINFMT_ELF_STATE |
| select ARCH_ENABLE_MEMORY_HOTPLUG if SPARSEMEM |
| select ARCH_ENABLE_MEMORY_HOTREMOVE |
| select ARCH_ENABLE_SPLIT_PMD_PTLOCK if PGTABLE_LEVELS > 2 |
| select ARCH_HAS_DEBUG_VM_PGTABLE |
| select ARCH_HAS_DEBUG_WX |
| select ARCH_HAS_DEVMEM_IS_ALLOWED |
| select ARCH_HAS_ELF_RANDOMIZE |
| select ARCH_HAS_FORCE_DMA_UNENCRYPTED |
| select ARCH_HAS_FORTIFY_SOURCE |
| select ARCH_HAS_GCOV_PROFILE_ALL |
| select ARCH_HAS_GIGANTIC_PAGE |
| select ARCH_HAS_KCOV |
| select ARCH_HAS_MEM_ENCRYPT |
| select ARCH_HAS_PTE_SPECIAL |
| select ARCH_HAS_SCALED_CPUTIME |
| select ARCH_HAS_SET_MEMORY |
| select ARCH_HAS_STRICT_KERNEL_RWX |
| select ARCH_HAS_STRICT_MODULE_RWX |
| select ARCH_HAS_SYSCALL_WRAPPER |
| select ARCH_HAS_UBSAN_SANITIZE_ALL |
| select ARCH_HAS_VDSO_DATA |
| select ARCH_HAVE_NMI_SAFE_CMPXCHG |
| select ARCH_INLINE_READ_LOCK |
| select ARCH_INLINE_READ_LOCK_BH |
| select ARCH_INLINE_READ_LOCK_IRQ |
| select ARCH_INLINE_READ_LOCK_IRQSAVE |
| select ARCH_INLINE_READ_TRYLOCK |
| select ARCH_INLINE_READ_UNLOCK |
| select ARCH_INLINE_READ_UNLOCK_BH |
| select ARCH_INLINE_READ_UNLOCK_IRQ |
| select ARCH_INLINE_READ_UNLOCK_IRQRESTORE |
| select ARCH_INLINE_SPIN_LOCK |
| select ARCH_INLINE_SPIN_LOCK_BH |
| select ARCH_INLINE_SPIN_LOCK_IRQ |
| select ARCH_INLINE_SPIN_LOCK_IRQSAVE |
| select ARCH_INLINE_SPIN_TRYLOCK |
| select ARCH_INLINE_SPIN_TRYLOCK_BH |
| select ARCH_INLINE_SPIN_UNLOCK |
| select ARCH_INLINE_SPIN_UNLOCK_BH |
| select ARCH_INLINE_SPIN_UNLOCK_IRQ |
| select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE |
| select ARCH_INLINE_WRITE_LOCK |
| select ARCH_INLINE_WRITE_LOCK_BH |
| select ARCH_INLINE_WRITE_LOCK_IRQ |
| select ARCH_INLINE_WRITE_LOCK_IRQSAVE |
| select ARCH_INLINE_WRITE_TRYLOCK |
| select ARCH_INLINE_WRITE_UNLOCK |
| select ARCH_INLINE_WRITE_UNLOCK_BH |
| select ARCH_INLINE_WRITE_UNLOCK_IRQ |
| select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE |
| select ARCH_STACKWALK |
| select ARCH_SUPPORTS_ATOMIC_RMW |
| select ARCH_SUPPORTS_DEBUG_PAGEALLOC |
| select ARCH_SUPPORTS_NUMA_BALANCING |
| select ARCH_USE_BUILTIN_BSWAP |
| select ARCH_USE_CMPXCHG_LOCKREF |
| select ARCH_WANTS_DYNAMIC_TASK_STRUCT |
| select ARCH_WANTS_NO_INSTR |
| select ARCH_WANT_DEFAULT_BPF_JIT |
| select ARCH_WANT_IPC_PARSE_VERSION |
| select BUILDTIME_TABLE_SORT |
| select CLONE_BACKWARDS2 |
| select CPU_NO_EFFICIENT_FFS if !HAVE_MARCH_Z9_109_FEATURES |
| select DMA_OPS if PCI |
| select DYNAMIC_FTRACE if FUNCTION_TRACER |
| select GENERIC_ALLOCATOR |
| select GENERIC_CPU_AUTOPROBE |
| select GENERIC_CPU_VULNERABILITIES |
| select GENERIC_ENTRY |
| select GENERIC_FIND_FIRST_BIT |
| select GENERIC_GETTIMEOFDAY |
| select GENERIC_PTDUMP |
| select GENERIC_SMP_IDLE_THREAD |
| select GENERIC_TIME_VSYSCALL |
| select GENERIC_VDSO_TIME_NS |
| select HAVE_ALIGNED_STRUCT_PAGE if SLUB |
| select HAVE_ARCH_AUDITSYSCALL |
| select HAVE_ARCH_JUMP_LABEL |
| select HAVE_ARCH_JUMP_LABEL_RELATIVE |
| select HAVE_ARCH_KASAN |
| select HAVE_ARCH_KASAN_VMALLOC |
| select HAVE_ARCH_RANDOMIZE_KSTACK_OFFSET |
| select HAVE_ARCH_SECCOMP_FILTER |
| select HAVE_ARCH_SOFT_DIRTY |
| select HAVE_ARCH_TRACEHOOK |
| select HAVE_ARCH_TRANSPARENT_HUGEPAGE |
| select HAVE_ARCH_VMAP_STACK |
| select HAVE_ASM_MODVERSIONS |
| select HAVE_CMPXCHG_DOUBLE |
| select HAVE_CMPXCHG_LOCAL |
| select HAVE_DEBUG_KMEMLEAK |
| select HAVE_DMA_CONTIGUOUS |
| select HAVE_DYNAMIC_FTRACE |
| select HAVE_DYNAMIC_FTRACE_WITH_REGS |
| select HAVE_EBPF_JIT if PACK_STACK && HAVE_MARCH_Z196_FEATURES |
| select HAVE_EFFICIENT_UNALIGNED_ACCESS |
| select HAVE_FAST_GUP |
| select HAVE_FENTRY |
| select HAVE_FTRACE_MCOUNT_RECORD |
| select HAVE_FUNCTION_ERROR_INJECTION |
| select HAVE_FUNCTION_GRAPH_TRACER |
| select HAVE_FUNCTION_TRACER |
| select HAVE_FUTEX_CMPXCHG if FUTEX |
| select HAVE_GCC_PLUGINS |
| select HAVE_GENERIC_VDSO |
| select HAVE_IOREMAP_PROT if PCI |
| select HAVE_KERNEL_BZIP2 |
| select HAVE_KERNEL_GZIP |
| select HAVE_KERNEL_LZ4 |
| select HAVE_KERNEL_LZMA |
| select HAVE_KERNEL_LZO |
| select HAVE_KERNEL_UNCOMPRESSED |
| select HAVE_KERNEL_XZ |
| select HAVE_KERNEL_ZSTD |
| select HAVE_KPROBES |
| select HAVE_KPROBES_ON_FTRACE |
| select HAVE_KRETPROBES |
| select HAVE_KVM |
| select HAVE_LIVEPATCH |
| select HAVE_MEMBLOCK_PHYS_MAP |
| select HAVE_MOD_ARCH_SPECIFIC |
| select HAVE_NMI |
| select HAVE_NOP_MCOUNT |
| select HAVE_PCI |
| select HAVE_PERF_EVENTS |
| select HAVE_PERF_REGS |
| select HAVE_PERF_USER_STACK_DUMP |
| select HAVE_REGS_AND_STACK_ACCESS_API |
| select HAVE_RELIABLE_STACKTRACE |
| select HAVE_RSEQ |
| select HAVE_SOFTIRQ_ON_OWN_STACK |
| select HAVE_SYSCALL_TRACEPOINTS |
| select HAVE_VIRT_CPU_ACCOUNTING |
| select HAVE_VIRT_CPU_ACCOUNTING_IDLE |
| select IOMMU_HELPER if PCI |
| select IOMMU_SUPPORT if PCI |
| select MMU_GATHER_NO_GATHER |
| select MMU_GATHER_RCU_TABLE_FREE |
| select MODULES_USE_ELF_RELA |
| select NEED_DMA_MAP_STATE if PCI |
| select NEED_SG_DMA_LENGTH if PCI |
| select OLD_SIGACTION |
| select OLD_SIGSUSPEND3 |
| select PCI_DOMAINS if PCI |
| select PCI_MSI if PCI |
| select PCI_MSI_ARCH_FALLBACKS if PCI_MSI |
| select SPARSE_IRQ |
| select SWIOTLB |
| select SYSCTL_EXCEPTION_TRACE |
| select THREAD_INFO_IN_TASK |
| select TTY |
| select VIRT_CPU_ACCOUNTING |
| select ZONE_DMA |
| # Note: keep the above list sorted alphabetically |
| |
| config SCHED_OMIT_FRAME_POINTER |
| def_bool y |
| |
| config PGTABLE_LEVELS |
| int |
| default 5 |
| |
| source "kernel/livepatch/Kconfig" |
| |
| menu "Processor type and features" |
| |
| config HAVE_MARCH_Z900_FEATURES |
| def_bool n |
| |
| config HAVE_MARCH_Z990_FEATURES |
| def_bool n |
| select HAVE_MARCH_Z900_FEATURES |
| |
| config HAVE_MARCH_Z9_109_FEATURES |
| def_bool n |
| select HAVE_MARCH_Z990_FEATURES |
| |
| config HAVE_MARCH_Z10_FEATURES |
| def_bool n |
| select HAVE_MARCH_Z9_109_FEATURES |
| |
| config HAVE_MARCH_Z196_FEATURES |
| def_bool n |
| select HAVE_MARCH_Z10_FEATURES |
| |
| config HAVE_MARCH_ZEC12_FEATURES |
| def_bool n |
| select HAVE_MARCH_Z196_FEATURES |
| |
| config HAVE_MARCH_Z13_FEATURES |
| def_bool n |
| select HAVE_MARCH_ZEC12_FEATURES |
| |
| config HAVE_MARCH_Z14_FEATURES |
| def_bool n |
| select HAVE_MARCH_Z13_FEATURES |
| |
| config HAVE_MARCH_Z15_FEATURES |
| def_bool n |
| select HAVE_MARCH_Z14_FEATURES |
| |
| choice |
| prompt "Processor type" |
| default MARCH_Z196 |
| |
| config MARCH_Z900 |
| bool "IBM zSeries model z800 and z900" |
| select HAVE_MARCH_Z900_FEATURES |
| depends on $(cc-option,-march=z900) |
| help |
| Select this to enable optimizations for model z800/z900 (2064 and |
| 2066 series). This will enable some optimizations that are not |
| available on older ESA/390 (31 Bit) only CPUs. |
| |
| config MARCH_Z990 |
| bool "IBM zSeries model z890 and z990" |
| select HAVE_MARCH_Z990_FEATURES |
| depends on $(cc-option,-march=z990) |
| help |
| Select this to enable optimizations for model z890/z990 (2084 and |
| 2086 series). The kernel will be slightly faster but will not work |
| on older machines. |
| |
| config MARCH_Z9_109 |
| bool "IBM System z9" |
| select HAVE_MARCH_Z9_109_FEATURES |
| depends on $(cc-option,-march=z9-109) |
| help |
| Select this to enable optimizations for IBM System z9 (2094 and |
| 2096 series). The kernel will be slightly faster but will not work |
| on older machines. |
| |
| config MARCH_Z10 |
| bool "IBM System z10" |
| select HAVE_MARCH_Z10_FEATURES |
| depends on $(cc-option,-march=z10) |
| help |
| Select this to enable optimizations for IBM System z10 (2097 and |
| 2098 series). The kernel will be slightly faster but will not work |
| on older machines. |
| |
| config MARCH_Z196 |
| bool "IBM zEnterprise 114 and 196" |
| select HAVE_MARCH_Z196_FEATURES |
| depends on $(cc-option,-march=z196) |
| help |
| Select this to enable optimizations for IBM zEnterprise 114 and 196 |
| (2818 and 2817 series). The kernel will be slightly faster but will |
| not work on older machines. |
| |
| config MARCH_ZEC12 |
| bool "IBM zBC12 and zEC12" |
| select HAVE_MARCH_ZEC12_FEATURES |
| depends on $(cc-option,-march=zEC12) |
| help |
| Select this to enable optimizations for IBM zBC12 and zEC12 (2828 and |
| 2827 series). The kernel will be slightly faster but will not work on |
| older machines. |
| |
| config MARCH_Z13 |
| bool "IBM z13s and z13" |
| select HAVE_MARCH_Z13_FEATURES |
| depends on $(cc-option,-march=z13) |
| help |
| Select this to enable optimizations for IBM z13s and z13 (2965 and |
| 2964 series). The kernel will be slightly faster but will not work on |
| older machines. |
| |
| config MARCH_Z14 |
| bool "IBM z14 ZR1 and z14" |
| select HAVE_MARCH_Z14_FEATURES |
| depends on $(cc-option,-march=z14) |
| help |
| Select this to enable optimizations for IBM z14 ZR1 and z14 (3907 |
| and 3906 series). The kernel will be slightly faster but will not |
| work on older machines. |
| |
| config MARCH_Z15 |
| bool "IBM z15" |
| select HAVE_MARCH_Z15_FEATURES |
| depends on $(cc-option,-march=z15) |
| help |
| Select this to enable optimizations for IBM z15 (8562 |
| and 8561 series). The kernel will be slightly faster but will not |
| work on older machines. |
| |
| endchoice |
| |
| config MARCH_Z900_TUNE |
| def_bool TUNE_Z900 || MARCH_Z900 && TUNE_DEFAULT |
| |
| config MARCH_Z990_TUNE |
| def_bool TUNE_Z990 || MARCH_Z990 && TUNE_DEFAULT |
| |
| config MARCH_Z9_109_TUNE |
| def_bool TUNE_Z9_109 || MARCH_Z9_109 && TUNE_DEFAULT |
| |
| config MARCH_Z10_TUNE |
| def_bool TUNE_Z10 || MARCH_Z10 && TUNE_DEFAULT |
| |
| config MARCH_Z196_TUNE |
| def_bool TUNE_Z196 || MARCH_Z196 && TUNE_DEFAULT |
| |
| config MARCH_ZEC12_TUNE |
| def_bool TUNE_ZEC12 || MARCH_ZEC12 && TUNE_DEFAULT |
| |
| config MARCH_Z13_TUNE |
| def_bool TUNE_Z13 || MARCH_Z13 && TUNE_DEFAULT |
| |
| config MARCH_Z14_TUNE |
| def_bool TUNE_Z14 || MARCH_Z14 && TUNE_DEFAULT |
| |
| config MARCH_Z15_TUNE |
| def_bool TUNE_Z15 || MARCH_Z15 && TUNE_DEFAULT |
| |
| choice |
| prompt "Tune code generation" |
| default TUNE_DEFAULT |
| help |
| Cause the compiler to tune (-mtune) the generated code for a machine. |
| This will make the code run faster on the selected machine but |
| somewhat slower on other machines. |
| This option only changes how the compiler emits instructions, not the |
| selection of instructions itself, so the resulting kernel will run on |
| all other machines. |
| |
| config TUNE_DEFAULT |
| bool "Default" |
| help |
| Tune the generated code for the target processor for which the kernel |
| will be compiled. |
| |
| config TUNE_Z900 |
| bool "IBM zSeries model z800 and z900" |
| depends on $(cc-option,-mtune=z900) |
| |
| config TUNE_Z990 |
| bool "IBM zSeries model z890 and z990" |
| depends on $(cc-option,-mtune=z990) |
| |
| config TUNE_Z9_109 |
| bool "IBM System z9" |
| depends on $(cc-option,-mtune=z9-109) |
| |
| config TUNE_Z10 |
| bool "IBM System z10" |
| depends on $(cc-option,-mtune=z10) |
| |
| config TUNE_Z196 |
| bool "IBM zEnterprise 114 and 196" |
| depends on $(cc-option,-mtune=z196) |
| |
| config TUNE_ZEC12 |
| bool "IBM zBC12 and zEC12" |
| depends on $(cc-option,-mtune=zEC12) |
| |
| config TUNE_Z13 |
| bool "IBM z13s and z13" |
| depends on $(cc-option,-mtune=z13) |
| |
| config TUNE_Z14 |
| bool "IBM z14 ZR1 and z14" |
| depends on $(cc-option,-mtune=z14) |
| |
| config TUNE_Z15 |
| bool "IBM z15" |
| depends on $(cc-option,-mtune=z15) |
| |
| endchoice |
| |
| config 64BIT |
| def_bool y |
| |
| config COMPAT |
| def_bool y |
| prompt "Kernel support for 31 bit emulation" |
| select ARCH_WANT_OLD_COMPAT_IPC |
| select COMPAT_OLD_SIGACTION |
| select HAVE_UID16 |
| depends on MULTIUSER |
| depends on !CC_IS_CLANG |
| help |
| Select this option if you want to enable your system kernel to |
| handle system-calls from ELF binaries for 31 bit ESA. This option |
| (and some other stuff like libraries and such) is needed for |
| executing 31 bit applications. It is safe to say "Y". |
| |
| config SYSVIPC_COMPAT |
| def_bool y if COMPAT && SYSVIPC |
| |
| config SMP |
| def_bool y |
| |
| config NR_CPUS |
| int "Maximum number of CPUs (2-512)" |
| range 2 512 |
| default "64" |
| help |
| This allows you to specify the maximum number of CPUs which this |
| kernel will support. The maximum supported value is 512 and the |
| minimum value which makes sense is 2. |
| |
| This is purely to save memory - each supported CPU adds |
| approximately sixteen kilobytes to the kernel image. |
| |
| config HOTPLUG_CPU |
| def_bool y |
| |
| config NUMA |
| bool "NUMA support" |
| depends on SCHED_TOPOLOGY |
| default n |
| help |
| Enable NUMA support |
| |
| This option adds NUMA support to the kernel. |
| |
| config NODES_SHIFT |
| int |
| depends on NUMA |
| default "1" |
| |
| config SCHED_SMT |
| def_bool n |
| |
| config SCHED_MC |
| def_bool n |
| |
| config SCHED_BOOK |
| def_bool n |
| |
| config SCHED_DRAWER |
| def_bool n |
| |
| config SCHED_TOPOLOGY |
| def_bool y |
| prompt "Topology scheduler support" |
| select SCHED_SMT |
| select SCHED_MC |
| select SCHED_BOOK |
| select SCHED_DRAWER |
| help |
| Topology scheduler support improves the CPU scheduler's decision |
| making when dealing with machines that have multi-threading, |
| multiple cores or multiple books. |
| |
| source "kernel/Kconfig.hz" |
| |
| config KEXEC |
| def_bool y |
| select KEXEC_CORE |
| |
| config KEXEC_FILE |
| bool "kexec file based system call" |
| select KEXEC_CORE |
| select BUILD_BIN2C |
| depends on CRYPTO |
| depends on CRYPTO_SHA256 |
| depends on CRYPTO_SHA256_S390 |
| help |
| Enable the kexec file based system call. In contrast to the normal |
| kexec system call this system call takes file descriptors for the |
| kernel and initramfs as arguments. |
| |
| config ARCH_HAS_KEXEC_PURGATORY |
| def_bool y |
| depends on KEXEC_FILE |
| |
| config KEXEC_SIG |
| bool "Verify kernel signature during kexec_file_load() syscall" |
| depends on KEXEC_FILE && MODULE_SIG_FORMAT |
| help |
| This option makes kernel signature verification mandatory for |
| the kexec_file_load() syscall. |
| |
| In addition to that option, you need to enable signature |
| verification for the corresponding kernel image type being |
| loaded in order for this to work. |
| |
| config ARCH_RANDOM |
| def_bool y |
| prompt "s390 architectural random number generation API" |
| help |
| Enable the s390 architectural random number generation API |
| to provide random data for all consumers within the Linux |
| kernel. |
| |
| When enabled the arch_random_* functions declared in linux/random.h |
| are implemented. The implementation is based on the s390 CPACF |
| instruction subfunction TRNG which provides a real true random |
| number generator. |
| |
| If unsure, say Y. |
| |
| config KERNEL_NOBP |
| def_bool n |
| prompt "Enable modified branch prediction for the kernel by default" |
| help |
| If this option is selected the kernel will switch to a modified |
| branch prediction mode if the firmware interface is available. |
| The modified branch prediction mode improves the behaviour in |
| regard to speculative execution. |
| |
| With the option enabled the kernel parameter "nobp=0" or "nospec" |
| can be used to run the kernel in the normal branch prediction mode. |
| |
| With the option disabled the modified branch prediction mode is |
| enabled with the "nobp=1" kernel parameter. |
| |
| If unsure, say N. |
| |
| config EXPOLINE |
| def_bool n |
| prompt "Avoid speculative indirect branches in the kernel" |
| help |
| Compile the kernel with the expoline compiler options to guard |
| against kernel-to-user data leaks by avoiding speculative indirect |
| branches. |
| Requires a compiler with -mindirect-branch=thunk support for full |
| protection. The kernel may run slower. |
| |
| If unsure, say N. |
| |
| choice |
| prompt "Expoline default" |
| depends on EXPOLINE |
| default EXPOLINE_FULL |
| |
| config EXPOLINE_OFF |
| bool "spectre_v2=off" |
| |
| config EXPOLINE_AUTO |
| bool "spectre_v2=auto" |
| |
| config EXPOLINE_FULL |
| bool "spectre_v2=on" |
| |
| endchoice |
| |
| config RELOCATABLE |
| bool "Build a relocatable kernel" |
| select MODULE_REL_CRCS if MODVERSIONS |
| default y |
| help |
| This builds a kernel image that retains relocation information |
| so it can be loaded at an arbitrary address. |
| The kernel is linked as a position-independent executable (PIE) |
| and contains dynamic relocations which are processed early in the |
| bootup process. |
| The relocations make the kernel image about 15% larger (compressed |
| 10%), but are discarded at runtime. |
| |
| config RANDOMIZE_BASE |
| bool "Randomize the address of the kernel image (KASLR)" |
| depends on RELOCATABLE |
| default y |
| help |
| In support of Kernel Address Space Layout Randomization (KASLR), |
| this randomizes the address at which the kernel image is loaded, |
| as a security feature that deters exploit attempts relying on |
| knowledge of the location of kernel internals. |
| |
| endmenu |
| |
| menu "Memory setup" |
| |
| config ARCH_SPARSEMEM_ENABLE |
| def_bool y |
| select SPARSEMEM_VMEMMAP_ENABLE |
| select SPARSEMEM_VMEMMAP |
| |
| config ARCH_SPARSEMEM_DEFAULT |
| def_bool y |
| |
| config MAX_PHYSMEM_BITS |
| int "Maximum size of supported physical memory in bits (42-53)" |
| range 42 53 |
| default "46" |
| help |
| This option specifies the maximum supported size of physical memory |
| in bits. Supported is any size between 2^42 (4TB) and 2^53 (8PB). |
| Increasing the number of bits also increases the kernel image size. |
| By default 46 bits (64TB) are supported. |
| |
| config PACK_STACK |
| def_bool y |
| prompt "Pack kernel stack" |
| help |
| This option enables the compiler option -mkernel-backchain if it |
| is available. If the option is available the compiler supports |
| the new stack layout which dramatically reduces the minimum stack |
| frame size. With an old compiler a non-leaf function needs a |
| minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With |
| -mkernel-backchain the minimum size drops to 16 byte on 31 bit |
| and 24 byte on 64 bit. |
| |
| Say Y if you are unsure. |
| |
| config CHECK_STACK |
| def_bool y |
| depends on !VMAP_STACK |
| prompt "Detect kernel stack overflow" |
| help |
| This option enables the compiler option -mstack-guard and |
| -mstack-size if they are available. If the compiler supports them |
| it will emit additional code to each function prolog to trigger |
| an illegal operation if the kernel stack is about to overflow. |
| |
| Say N if you are unsure. |
| |
| config STACK_GUARD |
| int "Size of the guard area (128-1024)" |
| range 128 1024 |
| depends on CHECK_STACK |
| default "256" |
| help |
| This allows you to specify the size of the guard area at the lower |
| end of the kernel stack. If the kernel stack points into the guard |
| area on function entry an illegal operation is triggered. The size |
| needs to be a power of 2. Please keep in mind that the size of an |
| interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit. |
| The minimum size for the stack guard should be 256 for 31 bit and |
| 512 for 64 bit. |
| |
| config WARN_DYNAMIC_STACK |
| def_bool n |
| prompt "Emit compiler warnings for function with dynamic stack usage" |
| help |
| This option enables the compiler option -mwarn-dynamicstack. If the |
| compiler supports this options generates warnings for functions |
| that dynamically allocate stack space using alloca. |
| |
| Say N if you are unsure. |
| |
| endmenu |
| |
| menu "I/O subsystem" |
| |
| config QDIO |
| def_tristate y |
| prompt "QDIO support" |
| help |
| This driver provides the Queued Direct I/O base support for |
| IBM System z. |
| |
| To compile this driver as a module, choose M here: the |
| module will be called qdio. |
| |
| If unsure, say Y. |
| |
| if PCI |
| |
| config PCI_NR_FUNCTIONS |
| int "Maximum number of PCI functions (1-4096)" |
| range 1 4096 |
| default "512" |
| help |
| This allows you to specify the maximum number of PCI functions which |
| this kernel will support. |
| |
| endif # PCI |
| |
| config HAS_IOMEM |
| def_bool PCI |
| |
| config CHSC_SCH |
| def_tristate m |
| prompt "Support for CHSC subchannels" |
| help |
| This driver allows usage of CHSC subchannels. A CHSC subchannel |
| is usually present on LPAR only. |
| The driver creates a device /dev/chsc, which may be used to |
| obtain I/O configuration information about the machine and |
| to issue asynchronous chsc commands (DANGEROUS). |
| You will usually only want to use this interface on a special |
| LPAR designated for system management. |
| |
| To compile this driver as a module, choose M here: the |
| module will be called chsc_sch. |
| |
| If unsure, say N. |
| |
| config SCM_BUS |
| def_bool y |
| prompt "SCM bus driver" |
| help |
| Bus driver for Storage Class Memory. |
| |
| config EADM_SCH |
| def_tristate m |
| prompt "Support for EADM subchannels" |
| depends on SCM_BUS |
| help |
| This driver allows usage of EADM subchannels. EADM subchannels act |
| as a communication vehicle for SCM increments. |
| |
| To compile this driver as a module, choose M here: the |
| module will be called eadm_sch. |
| |
| config VFIO_CCW |
| def_tristate n |
| prompt "Support for VFIO-CCW subchannels" |
| depends on S390_CCW_IOMMU && VFIO_MDEV |
| help |
| This driver allows usage of I/O subchannels via VFIO-CCW. |
| |
| To compile this driver as a module, choose M here: the |
| module will be called vfio_ccw. |
| |
| config VFIO_AP |
| def_tristate n |
| prompt "VFIO support for AP devices" |
| depends on S390_AP_IOMMU && VFIO_MDEV && KVM |
| depends on ZCRYPT |
| help |
| This driver grants access to Adjunct Processor (AP) devices |
| via the VFIO mediated device interface. |
| |
| To compile this driver as a module, choose M here: the module |
| will be called vfio_ap. |
| |
| endmenu |
| |
| menu "Dump support" |
| |
| config CRASH_DUMP |
| bool "kernel crash dumps" |
| select KEXEC |
| help |
| Generate crash dump after being started by kexec. |
| Crash dump kernels are loaded in the main kernel with kexec-tools |
| into a specially reserved region and then later executed after |
| a crash by kdump/kexec. |
| Refer to <file:Documentation/s390/zfcpdump.rst> for more details on this. |
| This option also enables s390 zfcpdump. |
| See also <file:Documentation/s390/zfcpdump.rst> |
| |
| endmenu |
| |
| config CCW |
| def_bool y |
| |
| config HAVE_PNETID |
| tristate |
| default (SMC || CCWGROUP) |
| |
| menu "Virtualization" |
| |
| config PROTECTED_VIRTUALIZATION_GUEST |
| def_bool n |
| prompt "Protected virtualization guest support" |
| select ARCH_HAS_RESTRICTED_VIRTIO_MEMORY_ACCESS |
| help |
| Select this option, if you want to be able to run this |
| kernel as a protected virtualization KVM guest. |
| Protected virtualization capable machines have a mini hypervisor |
| located at machine level (an ultravisor). With help of the |
| Ultravisor, KVM will be able to run "protected" VMs, special |
| VMs whose memory and management data are unavailable to KVM. |
| |
| config PFAULT |
| def_bool y |
| prompt "Pseudo page fault support" |
| help |
| Select this option, if you want to use PFAULT pseudo page fault |
| handling under VM. If running native or in LPAR, this option |
| has no effect. If your VM does not support PFAULT, PAGEEX |
| pseudo page fault handling will be used. |
| Note that VM 4.2 supports PFAULT but has a bug in its |
| implementation that causes some problems. |
| Everybody who wants to run Linux under VM != VM4.2 should select |
| this option. |
| |
| config CMM |
| def_tristate n |
| prompt "Cooperative memory management" |
| help |
| Select this option, if you want to enable the kernel interface |
| to reduce the memory size of the system. This is accomplished |
| by allocating pages of memory and put them "on hold". This only |
| makes sense for a system running under VM where the unused pages |
| will be reused by VM for other guest systems. The interface |
| allows an external monitor to balance memory of many systems. |
| Everybody who wants to run Linux under VM should select this |
| option. |
| |
| config CMM_IUCV |
| def_bool y |
| prompt "IUCV special message interface to cooperative memory management" |
| depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV) |
| help |
| Select this option to enable the special message interface to |
| the cooperative memory management. |
| |
| config APPLDATA_BASE |
| def_bool n |
| prompt "Linux - VM Monitor Stream, base infrastructure" |
| depends on PROC_SYSCTL |
| help |
| This provides a kernel interface for creating and updating z/VM APPLDATA |
| monitor records. The monitor records are updated at certain time |
| intervals, once the timer is started. |
| Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer, |
| i.e. enables or disables monitoring on the Linux side. |
| A custom interval value (in seconds) can be written to |
| /proc/appldata/interval. |
| |
| Defaults are 60 seconds interval and timer off. |
| The /proc entries can also be read from, showing the current settings. |
| |
| config APPLDATA_MEM |
| def_tristate m |
| prompt "Monitor memory management statistics" |
| depends on APPLDATA_BASE && VM_EVENT_COUNTERS |
| help |
| This provides memory management related data to the Linux - VM Monitor |
| Stream, like paging/swapping rate, memory utilisation, etc. |
| Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM |
| APPLDATA monitor record, i.e. enables or disables monitoring this record |
| on the z/VM side. |
| |
| Default is disabled. |
| The /proc entry can also be read from, showing the current settings. |
| |
| This can also be compiled as a module, which will be called |
| appldata_mem.o. |
| |
| config APPLDATA_OS |
| def_tristate m |
| prompt "Monitor OS statistics" |
| depends on APPLDATA_BASE |
| help |
| This provides OS related data to the Linux - VM Monitor Stream, like |
| CPU utilisation, etc. |
| Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM |
| APPLDATA monitor record, i.e. enables or disables monitoring this record |
| on the z/VM side. |
| |
| Default is disabled. |
| This can also be compiled as a module, which will be called |
| appldata_os.o. |
| |
| config APPLDATA_NET_SUM |
| def_tristate m |
| prompt "Monitor overall network statistics" |
| depends on APPLDATA_BASE && NET |
| help |
| This provides network related data to the Linux - VM Monitor Stream, |
| currently there is only a total sum of network I/O statistics, no |
| per-interface data. |
| Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM |
| APPLDATA monitor record, i.e. enables or disables monitoring this record |
| on the z/VM side. |
| |
| Default is disabled. |
| This can also be compiled as a module, which will be called |
| appldata_net_sum.o. |
| |
| config S390_HYPFS_FS |
| def_bool y |
| prompt "s390 hypervisor file system support" |
| select SYS_HYPERVISOR |
| help |
| This is a virtual file system intended to provide accounting |
| information in an s390 hypervisor environment. |
| |
| source "arch/s390/kvm/Kconfig" |
| |
| config S390_GUEST |
| def_bool y |
| prompt "s390 support for virtio devices" |
| select TTY |
| select VIRTUALIZATION |
| select VIRTIO |
| help |
| Enabling this option adds support for virtio based paravirtual device |
| drivers on s390. |
| |
| Select this option if you want to run the kernel as a guest under |
| the KVM hypervisor. |
| |
| endmenu |
| |
| menu "Selftests" |
| |
| config S390_UNWIND_SELFTEST |
| def_tristate n |
| prompt "Test unwind functions" |
| help |
| This option enables s390 specific stack unwinder testing kernel |
| module. This option is not useful for distributions or general |
| kernels, but only for kernel developers working on architecture code. |
| |
| Say N if you are unsure. |
| |
| endmenu |
