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# SPDX-License-Identifier: GPL-2.0 config MMU def_bool y config ZONE_DMA 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 SMP && PREEMPT 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 if KASAN_S390_4_LEVEL_PAGING default 0x30000000000 config S390 def_bool y select ARCH_BINFMT_ELF_STATE select ARCH_HAS_DEVMEM_IS_ALLOWED select ARCH_HAS_ELF_RANDOMIZE select ARCH_HAS_FORTIFY_SOURCE select ARCH_HAS_GCOV_PROFILE_ALL select ARCH_HAS_GIGANTIC_PAGE if CONTIG_ALLOC select ARCH_HAS_KCOV select ARCH_HAS_MEM_ENCRYPT select ARCH_HAS_PTE_SPECIAL select ARCH_HAS_SET_MEMORY select ARCH_HAS_SG_CHAIN select ARCH_HAS_STRICT_KERNEL_RWX select ARCH_HAS_STRICT_MODULE_RWX select ARCH_HAS_UBSAN_SANITIZE_ALL 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_SAVE_PAGE_KEYS if HIBERNATION 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_WANT_DEFAULT_BPF_JIT select ARCH_WANT_IPC_PARSE_VERSION select BUILDTIME_EXTABLE_SORT select CLONE_BACKWARDS2 select DMA_OPS if PCI select DYNAMIC_FTRACE if FUNCTION_TRACER select GENERIC_CLOCKEVENTS select GENERIC_CPU_AUTOPROBE select GENERIC_CPU_DEVICES if !SMP select GENERIC_CPU_VULNERABILITIES select GENERIC_FIND_FIRST_BIT select GENERIC_SMP_IDLE_THREAD select GENERIC_TIME_VSYSCALL select HAVE_ALIGNED_STRUCT_PAGE if SLUB select HAVE_ARCH_AUDITSYSCALL select HAVE_ARCH_JUMP_LABEL select HAVE_ARCH_KASAN select CPU_NO_EFFICIENT_FFS if !HAVE_MARCH_Z9_109_FEATURES select HAVE_ARCH_SECCOMP_FILTER select HAVE_ARCH_SOFT_DIRTY select HAVE_ARCH_TRACEHOOK select HAVE_ARCH_TRANSPARENT_HUGEPAGE select HAVE_EBPF_JIT if PACK_STACK && HAVE_MARCH_Z196_FEATURES select HAVE_CMPXCHG_DOUBLE select HAVE_CMPXCHG_LOCAL select HAVE_COPY_THREAD_TLS select HAVE_DEBUG_KMEMLEAK select HAVE_DMA_CONTIGUOUS select HAVE_DYNAMIC_FTRACE select HAVE_DYNAMIC_FTRACE_WITH_REGS select HAVE_FAST_GUP select HAVE_EFFICIENT_UNALIGNED_ACCESS select HAVE_FTRACE_MCOUNT_RECORD select HAVE_FUNCTION_GRAPH_TRACER select HAVE_FUNCTION_TRACER select HAVE_FUTEX_CMPXCHG if FUTEX select HAVE_GCC_PLUGINS if BROKEN 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_KPROBES select HAVE_KPROBES_ON_FTRACE select HAVE_KRETPROBES select HAVE_KVM select HAVE_LIVEPATCH select HAVE_PERF_REGS select HAVE_PERF_USER_STACK_DUMP select HAVE_MEMBLOCK_PHYS_MAP select HAVE_MMU_GATHER_NO_GATHER select HAVE_MOD_ARCH_SPECIFIC select HAVE_OPROFILE select HAVE_PERF_EVENTS select HAVE_RCU_TABLE_FREE select HAVE_REGS_AND_STACK_ACCESS_API select HAVE_RSEQ select HAVE_SYSCALL_TRACEPOINTS select HAVE_VIRT_CPU_ACCOUNTING select MODULES_USE_ELF_RELA select OLD_SIGACTION select OLD_SIGSUSPEND3 select SPARSE_IRQ select SYSCTL_EXCEPTION_TRACE select THREAD_INFO_IN_TASK select TTY select VIRT_CPU_ACCOUNTING select ARCH_HAS_SCALED_CPUTIME select VIRT_TO_BUS select HAVE_NMI select ARCH_HAS_FORCE_DMA_UNENCRYPTED select SWIOTLB select GENERIC_ALLOCATOR config SCHED_OMIT_FRAME_POINTER def_bool y config PGTABLE_LEVELS int default 5 source "init/Kconfig" source "kernel/Kconfig.freezer" 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 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 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 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 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 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 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 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 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 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" config TUNE_Z990 bool "IBM zSeries model z890 and z990" config TUNE_Z9_109 bool "IBM System z9" config TUNE_Z10 bool "IBM System z10" config TUNE_Z196 bool "IBM zEnterprise 114 and 196" config TUNE_ZEC12 bool "IBM zBC12 and zEC12" config TUNE_Z13 bool "IBM z13" config TUNE_Z14 bool "IBM z14" config TUNE_Z15 bool "IBM z15" endchoice config 64BIT def_bool y config COMPAT def_bool y prompt "Kernel support for 31 bit emulation" select COMPAT_BINFMT_ELF if BINFMT_ELF select ARCH_WANT_OLD_COMPAT_IPC select COMPAT_OLD_SIGACTION depends on MULTIUSER 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 prompt "Symmetric multi-processing support" ---help--- This enables support for systems with more than one CPU. If you have a system with only one CPU, like most personal computers, say N. If you have a system with more than one CPU, say Y. If you say N here, the kernel will run on uni- and multiprocessor machines, but will use only one CPU of a multiprocessor machine. If you say Y here, the kernel will run on many, but not all, uniprocessor machines. On a uniprocessor machine, the kernel will run faster if you say N here. See also the SMP-HOWTO available at <http://www.tldp.org/docs.html#howto>. Even if you don't know what to do here, say Y. config NR_CPUS int "Maximum number of CPUs (2-512)" range 2 512 depends on SMP 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 prompt "Support for hot-pluggable CPUs" depends on SMP help Say Y here to be able to turn CPUs off and on. CPUs can be controlled through /sys/devices/system/cpu/cpu#. Say N if you want to disable CPU hotplug. # Some NUMA nodes have memory ranges that span # other nodes. Even though a pfn is valid and # between a node's start and end pfns, it may not # reside on that node. See memmap_init_zone() # for details. <- They meant memory holes! config NODES_SPAN_OTHER_NODES def_bool NUMA config NUMA bool "NUMA support" depends on SMP && SCHED_TOPOLOGY default n help Enable NUMA support This option adds NUMA support to the kernel. An operation mode can be selected by appending numa=<method> to the kernel command line. The default behaviour is identical to appending numa=plain to the command line. This will create just one node with all available memory and all CPUs in it. config NODES_SHIFT int "Maximum NUMA nodes (as a power of 2)" range 1 10 depends on NUMA default "4" help Specify the maximum number of NUMA nodes available on the target system. Increases memory reserved to accommodate various tables. menu "Select NUMA modes" depends on NUMA config NUMA_EMU bool "NUMA emulation" default y help Numa emulation mode will split the available system memory into equal chunks which then are distributed over the configured number of nodes in a round-robin manner. The number of fake nodes is limited by the number of available memory chunks (i.e. memory size / fake size) and the number of supported nodes in the kernel. The CPUs are assigned to the nodes in a way that partially respects the original machine topology (if supported by the machine). Fair distribution of the CPUs is not guaranteed. config EMU_SIZE hex "NUMA emulation memory chunk size" default 0x10000000 range 0x400000 0x100000000 depends on NUMA_EMU help Select the default size by which the memory is chopped and then assigned to emulated NUMA nodes. This can be overridden by specifying emu_size=<n> on the kernel command line where also suffixes K, M, G, and T are supported. endmenu 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" depends on SMP 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.preempt 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 ARCH_SELECT_MEMORY_MODEL def_bool y config ARCH_ENABLE_MEMORY_HOTPLUG def_bool y if SPARSEMEM config ARCH_ENABLE_MEMORY_HOTREMOVE def_bool y config ARCH_ENABLE_SPLIT_PMD_PTLOCK def_bool y config FORCE_MAX_ZONEORDER int default "9" source "mm/Kconfig" 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 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. menuconfig PCI bool "PCI support" select PCI_MSI select IOMMU_HELPER select IOMMU_SUPPORT select NEED_DMA_MAP_STATE select NEED_SG_DMA_LENGTH help Enable PCI support. if PCI config PCI_NR_FUNCTIONS int "Maximum number of PCI functions (1-4096)" range 1 4096 default "128" help This allows you to specify the maximum number of PCI functions which this kernel will support. source "drivers/pci/Kconfig" endif # PCI config PCI_DOMAINS def_bool 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_DEVICE && KVM 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" depends on SMP 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 menu "Executable file formats / Emulations" source "fs/Kconfig.binfmt" config SECCOMP def_bool y prompt "Enable seccomp to safely compute untrusted bytecode" depends on PROC_FS help This kernel feature is useful for number crunching applications that may need to compute untrusted bytecode during their execution. By using pipes or other transports made available to the process as file descriptors supporting the read/write syscalls, it's possible to isolate those applications in their own address space using seccomp. Once seccomp is enabled via /proc/<pid>/seccomp, it cannot be disabled and the task is only allowed to execute a few safe syscalls defined by each seccomp mode. If unsure, say Y. endmenu menu "Power Management" config ARCH_HIBERNATION_POSSIBLE def_bool y source "kernel/power/Kconfig" endmenu source "net/Kconfig" config PCMCIA def_bool n config CCW def_bool y source "drivers/Kconfig" config HAVE_PNETID tristate default (SMC || CCWGROUP) source "fs/Kconfig" source "arch/s390/Kconfig.debug" source "security/Kconfig" source "crypto/Kconfig" source "lib/Kconfig" menu "Virtualization" config PROTECTED_VIRTUALIZATION_GUEST def_bool n prompt "Protected virtualization guest support" 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_FS 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