1 # SPDX-License-Identifier: GPL-2.0
11 config LOCKDEP_SUPPORT
14 config STACKTRACE_SUPPORT
17 config ARCH_HAS_ILOG2_U32
20 config ARCH_HAS_ILOG2_U64
23 config GENERIC_HWEIGHT
29 config GENERIC_BUG_RELATIVE_POINTERS
32 config GENERIC_LOCKBREAK
38 config ARCH_SUPPORTS_DEBUG_PAGEALLOC
50 config ARCH_SUPPORTS_UPROBES
53 config KASAN_SHADOW_OFFSET
56 default 0x18000000000000 if KASAN_S390_4_LEVEL_PAGING
61 select ARCH_BINFMT_ELF_STATE
62 select ARCH_HAS_DEVMEM_IS_ALLOWED
63 select ARCH_HAS_ELF_RANDOMIZE
64 select ARCH_HAS_FORTIFY_SOURCE
65 select ARCH_HAS_GCOV_PROFILE_ALL
66 select ARCH_HAS_GIGANTIC_PAGE
68 select ARCH_HAS_MEM_ENCRYPT
69 select ARCH_HAS_PTE_SPECIAL
70 select ARCH_HAS_SET_MEMORY
71 select ARCH_HAS_STRICT_KERNEL_RWX
72 select ARCH_HAS_STRICT_MODULE_RWX
73 select ARCH_HAS_SYSCALL_WRAPPER
74 select ARCH_HAS_UBSAN_SANITIZE_ALL
75 select ARCH_HAVE_NMI_SAFE_CMPXCHG
76 select ARCH_INLINE_READ_LOCK
77 select ARCH_INLINE_READ_LOCK_BH
78 select ARCH_INLINE_READ_LOCK_IRQ
79 select ARCH_INLINE_READ_LOCK_IRQSAVE
80 select ARCH_INLINE_READ_TRYLOCK
81 select ARCH_INLINE_READ_UNLOCK
82 select ARCH_INLINE_READ_UNLOCK_BH
83 select ARCH_INLINE_READ_UNLOCK_IRQ
84 select ARCH_INLINE_READ_UNLOCK_IRQRESTORE
85 select ARCH_INLINE_SPIN_LOCK
86 select ARCH_INLINE_SPIN_LOCK_BH
87 select ARCH_INLINE_SPIN_LOCK_IRQ
88 select ARCH_INLINE_SPIN_LOCK_IRQSAVE
89 select ARCH_INLINE_SPIN_TRYLOCK
90 select ARCH_INLINE_SPIN_TRYLOCK_BH
91 select ARCH_INLINE_SPIN_UNLOCK
92 select ARCH_INLINE_SPIN_UNLOCK_BH
93 select ARCH_INLINE_SPIN_UNLOCK_IRQ
94 select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE
95 select ARCH_INLINE_WRITE_LOCK
96 select ARCH_INLINE_WRITE_LOCK_BH
97 select ARCH_INLINE_WRITE_LOCK_IRQ
98 select ARCH_INLINE_WRITE_LOCK_IRQSAVE
99 select ARCH_INLINE_WRITE_TRYLOCK
100 select ARCH_INLINE_WRITE_UNLOCK
101 select ARCH_INLINE_WRITE_UNLOCK_BH
102 select ARCH_INLINE_WRITE_UNLOCK_IRQ
103 select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE
104 select ARCH_KEEP_MEMBLOCK
105 select ARCH_SAVE_PAGE_KEYS if HIBERNATION
106 select ARCH_STACKWALK
107 select ARCH_SUPPORTS_ATOMIC_RMW
108 select ARCH_SUPPORTS_NUMA_BALANCING
109 select ARCH_USE_BUILTIN_BSWAP
110 select ARCH_USE_CMPXCHG_LOCKREF
111 select ARCH_WANTS_DYNAMIC_TASK_STRUCT
112 select ARCH_WANT_IPC_PARSE_VERSION
113 select BUILDTIME_EXTABLE_SORT
114 select CLONE_BACKWARDS2
115 select DYNAMIC_FTRACE if FUNCTION_TRACER
116 select GENERIC_CLOCKEVENTS
117 select GENERIC_CPU_AUTOPROBE
118 select GENERIC_CPU_VULNERABILITIES
119 select GENERIC_FIND_FIRST_BIT
120 select GENERIC_SMP_IDLE_THREAD
121 select GENERIC_TIME_VSYSCALL
122 select HAVE_ALIGNED_STRUCT_PAGE if SLUB
123 select HAVE_ARCH_AUDITSYSCALL
124 select HAVE_ARCH_JUMP_LABEL
125 select HAVE_ARCH_JUMP_LABEL_RELATIVE
126 select HAVE_ARCH_KASAN
127 select CPU_NO_EFFICIENT_FFS if !HAVE_MARCH_Z9_109_FEATURES
128 select HAVE_ARCH_SECCOMP_FILTER
129 select HAVE_ARCH_SOFT_DIRTY
130 select HAVE_ARCH_TRACEHOOK
131 select HAVE_ARCH_TRANSPARENT_HUGEPAGE
132 select HAVE_ARCH_VMAP_STACK
133 select HAVE_ASM_MODVERSIONS
134 select HAVE_EBPF_JIT if PACK_STACK && HAVE_MARCH_Z196_FEATURES
135 select HAVE_CMPXCHG_DOUBLE
136 select HAVE_CMPXCHG_LOCAL
137 select HAVE_COPY_THREAD_TLS
138 select HAVE_DEBUG_KMEMLEAK
139 select HAVE_DMA_CONTIGUOUS
140 select HAVE_DYNAMIC_FTRACE
141 select HAVE_DYNAMIC_FTRACE_WITH_REGS
143 select HAVE_EFFICIENT_UNALIGNED_ACCESS
145 select HAVE_FTRACE_MCOUNT_RECORD
146 select HAVE_FUNCTION_GRAPH_TRACER
147 select HAVE_FUNCTION_TRACER
148 select HAVE_FUTEX_CMPXCHG if FUTEX
149 select HAVE_GCC_PLUGINS
150 select HAVE_KERNEL_BZIP2
151 select HAVE_KERNEL_GZIP
152 select HAVE_KERNEL_LZ4
153 select HAVE_KERNEL_LZMA
154 select HAVE_KERNEL_LZO
155 select HAVE_KERNEL_UNCOMPRESSED
156 select HAVE_KERNEL_XZ
158 select HAVE_KRETPROBES
160 select HAVE_LIVEPATCH
161 select HAVE_PERF_REGS
162 select HAVE_PERF_USER_STACK_DUMP
163 select HAVE_MEMBLOCK_NODE_MAP
164 select HAVE_MEMBLOCK_PHYS_MAP
165 select HAVE_MMU_GATHER_NO_GATHER
166 select HAVE_MOD_ARCH_SPECIFIC
167 select HAVE_NOP_MCOUNT
170 select HAVE_PERF_EVENTS
171 select HAVE_RCU_TABLE_FREE
172 select HAVE_REGS_AND_STACK_ACCESS_API
174 select HAVE_SYSCALL_TRACEPOINTS
175 select HAVE_VIRT_CPU_ACCOUNTING
176 select IOMMU_HELPER if PCI
177 select IOMMU_SUPPORT if PCI
178 select MODULES_USE_ELF_RELA
179 select NEED_DMA_MAP_STATE if PCI
180 select NEED_SG_DMA_LENGTH if PCI
182 select OLD_SIGSUSPEND3
183 select PCI_DOMAINS if PCI
184 select PCI_MSI if PCI
186 select SYSCTL_EXCEPTION_TRACE
187 select THREAD_INFO_IN_TASK
189 select VIRT_CPU_ACCOUNTING
190 select ARCH_HAS_SCALED_CPUTIME
192 select ARCH_HAS_FORCE_DMA_UNENCRYPTED
194 select GENERIC_ALLOCATOR
197 config SCHED_OMIT_FRAME_POINTER
200 config PGTABLE_LEVELS
204 source "kernel/livepatch/Kconfig"
206 menu "Processor type and features"
208 config HAVE_MARCH_Z900_FEATURES
211 config HAVE_MARCH_Z990_FEATURES
213 select HAVE_MARCH_Z900_FEATURES
215 config HAVE_MARCH_Z9_109_FEATURES
217 select HAVE_MARCH_Z990_FEATURES
219 config HAVE_MARCH_Z10_FEATURES
221 select HAVE_MARCH_Z9_109_FEATURES
223 config HAVE_MARCH_Z196_FEATURES
225 select HAVE_MARCH_Z10_FEATURES
227 config HAVE_MARCH_ZEC12_FEATURES
229 select HAVE_MARCH_Z196_FEATURES
231 config HAVE_MARCH_Z13_FEATURES
233 select HAVE_MARCH_ZEC12_FEATURES
235 config HAVE_MARCH_Z14_FEATURES
237 select HAVE_MARCH_Z13_FEATURES
239 config HAVE_MARCH_Z15_FEATURES
241 select HAVE_MARCH_Z14_FEATURES
244 prompt "Processor type"
248 bool "IBM zSeries model z800 and z900"
249 depends on !CC_IS_CLANG
250 select HAVE_MARCH_Z900_FEATURES
252 Select this to enable optimizations for model z800/z900 (2064 and
253 2066 series). This will enable some optimizations that are not
254 available on older ESA/390 (31 Bit) only CPUs.
257 bool "IBM zSeries model z890 and z990"
258 depends on !CC_IS_CLANG
259 select HAVE_MARCH_Z990_FEATURES
261 Select this to enable optimizations for model z890/z990 (2084 and
262 2086 series). The kernel will be slightly faster but will not work
267 depends on !CC_IS_CLANG
268 select HAVE_MARCH_Z9_109_FEATURES
270 Select this to enable optimizations for IBM System z9 (2094 and
271 2096 series). The kernel will be slightly faster but will not work
275 bool "IBM System z10"
276 select HAVE_MARCH_Z10_FEATURES
278 Select this to enable optimizations for IBM System z10 (2097 and
279 2098 series). The kernel will be slightly faster but will not work
283 bool "IBM zEnterprise 114 and 196"
284 select HAVE_MARCH_Z196_FEATURES
286 Select this to enable optimizations for IBM zEnterprise 114 and 196
287 (2818 and 2817 series). The kernel will be slightly faster but will
288 not work on older machines.
291 bool "IBM zBC12 and zEC12"
292 select HAVE_MARCH_ZEC12_FEATURES
294 Select this to enable optimizations for IBM zBC12 and zEC12 (2828 and
295 2827 series). The kernel will be slightly faster but will not work on
299 bool "IBM z13s and z13"
300 select HAVE_MARCH_Z13_FEATURES
302 Select this to enable optimizations for IBM z13s and z13 (2965 and
303 2964 series). The kernel will be slightly faster but will not work on
307 bool "IBM z14 ZR1 and z14"
308 select HAVE_MARCH_Z14_FEATURES
310 Select this to enable optimizations for IBM z14 ZR1 and z14 (3907
311 and 3906 series). The kernel will be slightly faster but will not
312 work on older machines.
316 select HAVE_MARCH_Z15_FEATURES
318 Select this to enable optimizations for IBM z15 (8562
319 and 8561 series). The kernel will be slightly faster but will not
320 work on older machines.
324 config MARCH_Z900_TUNE
325 def_bool TUNE_Z900 || MARCH_Z900 && TUNE_DEFAULT
327 config MARCH_Z990_TUNE
328 def_bool TUNE_Z990 || MARCH_Z990 && TUNE_DEFAULT
330 config MARCH_Z9_109_TUNE
331 def_bool TUNE_Z9_109 || MARCH_Z9_109 && TUNE_DEFAULT
333 config MARCH_Z10_TUNE
334 def_bool TUNE_Z10 || MARCH_Z10 && TUNE_DEFAULT
336 config MARCH_Z196_TUNE
337 def_bool TUNE_Z196 || MARCH_Z196 && TUNE_DEFAULT
339 config MARCH_ZEC12_TUNE
340 def_bool TUNE_ZEC12 || MARCH_ZEC12 && TUNE_DEFAULT
342 config MARCH_Z13_TUNE
343 def_bool TUNE_Z13 || MARCH_Z13 && TUNE_DEFAULT
345 config MARCH_Z14_TUNE
346 def_bool TUNE_Z14 || MARCH_Z14 && TUNE_DEFAULT
348 config MARCH_Z15_TUNE
349 def_bool TUNE_Z15 || MARCH_Z15 && TUNE_DEFAULT
352 prompt "Tune code generation"
355 Cause the compiler to tune (-mtune) the generated code for a machine.
356 This will make the code run faster on the selected machine but
357 somewhat slower on other machines.
358 This option only changes how the compiler emits instructions, not the
359 selection of instructions itself, so the resulting kernel will run on
365 Tune the generated code for the target processor for which the kernel
369 bool "IBM zSeries model z800 and z900"
370 depends on !CC_IS_CLANG
373 bool "IBM zSeries model z890 and z990"
374 depends on !CC_IS_CLANG
378 depends on !CC_IS_CLANG
381 bool "IBM System z10"
384 bool "IBM zEnterprise 114 and 196"
387 bool "IBM zBC12 and zEC12"
405 prompt "Kernel support for 31 bit emulation"
406 select COMPAT_BINFMT_ELF if BINFMT_ELF
407 select ARCH_WANT_OLD_COMPAT_IPC
408 select COMPAT_OLD_SIGACTION
412 Select this option if you want to enable your system kernel to
413 handle system-calls from ELF binaries for 31 bit ESA. This option
414 (and some other stuff like libraries and such) is needed for
415 executing 31 bit applications. It is safe to say "Y".
418 def_bool COMPAT && !CC_IS_CLANG
420 config SYSVIPC_COMPAT
421 def_bool y if COMPAT && SYSVIPC
427 int "Maximum number of CPUs (2-512)"
431 This allows you to specify the maximum number of CPUs which this
432 kernel will support. The maximum supported value is 512 and the
433 minimum value which makes sense is 2.
435 This is purely to save memory - each supported CPU adds
436 approximately sixteen kilobytes to the kernel image.
441 # Some NUMA nodes have memory ranges that span
442 # other nodes. Even though a pfn is valid and
443 # between a node's start and end pfns, it may not
444 # reside on that node. See memmap_init_zone()
445 # for details. <- They meant memory holes!
446 config NODES_SPAN_OTHER_NODES
451 depends on SCHED_TOPOLOGY
456 This option adds NUMA support to the kernel.
458 An operation mode can be selected by appending
459 numa=<method> to the kernel command line.
461 The default behaviour is identical to appending numa=plain to
462 the command line. This will create just one node with all
463 available memory and all CPUs in it.
466 int "Maximum NUMA nodes (as a power of 2)"
471 Specify the maximum number of NUMA nodes available on the target
472 system. Increases memory reserved to accommodate various tables.
474 menu "Select NUMA modes"
478 bool "NUMA emulation"
481 Numa emulation mode will split the available system memory into
482 equal chunks which then are distributed over the configured number
483 of nodes in a round-robin manner.
485 The number of fake nodes is limited by the number of available memory
486 chunks (i.e. memory size / fake size) and the number of supported
489 The CPUs are assigned to the nodes in a way that partially respects
490 the original machine topology (if supported by the machine).
491 Fair distribution of the CPUs is not guaranteed.
494 hex "NUMA emulation memory chunk size"
496 range 0x400000 0x100000000
499 Select the default size by which the memory is chopped and then
500 assigned to emulated NUMA nodes.
502 This can be overridden by specifying
506 on the kernel command line where also suffixes K, M, G, and T are
523 config SCHED_TOPOLOGY
525 prompt "Topology scheduler support"
531 Topology scheduler support improves the CPU scheduler's decision
532 making when dealing with machines that have multi-threading,
533 multiple cores or multiple books.
535 source "kernel/Kconfig.hz"
542 bool "kexec file based system call"
546 depends on CRYPTO_SHA256
547 depends on CRYPTO_SHA256_S390
549 Enable the kexec file based system call. In contrast to the normal
550 kexec system call this system call takes file descriptors for the
551 kernel and initramfs as arguments.
553 config ARCH_HAS_KEXEC_PURGATORY
555 depends on KEXEC_FILE
558 bool "Verify kernel signature during kexec_file_load() syscall"
559 depends on KEXEC_FILE && MODULE_SIG_FORMAT
561 This option makes kernel signature verification mandatory for
562 the kexec_file_load() syscall.
564 In addition to that option, you need to enable signature
565 verification for the corresponding kernel image type being
566 loaded in order for this to work.
570 prompt "s390 architectural random number generation API"
572 Enable the s390 architectural random number generation API
573 to provide random data for all consumers within the Linux
576 When enabled the arch_random_* functions declared in linux/random.h
577 are implemented. The implementation is based on the s390 CPACF
578 instruction subfunction TRNG which provides a real true random
585 prompt "Enable modified branch prediction for the kernel by default"
587 If this option is selected the kernel will switch to a modified
588 branch prediction mode if the firmware interface is available.
589 The modified branch prediction mode improves the behaviour in
590 regard to speculative execution.
592 With the option enabled the kernel parameter "nobp=0" or "nospec"
593 can be used to run the kernel in the normal branch prediction mode.
595 With the option disabled the modified branch prediction mode is
596 enabled with the "nobp=1" kernel parameter.
602 prompt "Avoid speculative indirect branches in the kernel"
604 Compile the kernel with the expoline compiler options to guard
605 against kernel-to-user data leaks by avoiding speculative indirect
607 Requires a compiler with -mindirect-branch=thunk support for full
608 protection. The kernel may run slower.
613 prompt "Expoline default"
615 default EXPOLINE_FULL
618 bool "spectre_v2=off"
621 bool "spectre_v2=auto"
629 bool "Build a relocatable kernel"
630 select MODULE_REL_CRCS if MODVERSIONS
633 This builds a kernel image that retains relocation information
634 so it can be loaded at an arbitrary address.
635 The kernel is linked as a position-independent executable (PIE)
636 and contains dynamic relocations which are processed early in the
638 The relocations make the kernel image about 15% larger (compressed
639 10%), but are discarded at runtime.
641 config RANDOMIZE_BASE
642 bool "Randomize the address of the kernel image (KASLR)"
643 depends on RELOCATABLE
646 In support of Kernel Address Space Layout Randomization (KASLR),
647 this randomizes the address at which the kernel image is loaded,
648 as a security feature that deters exploit attempts relying on
649 knowledge of the location of kernel internals.
655 config ARCH_SPARSEMEM_ENABLE
657 select SPARSEMEM_VMEMMAP_ENABLE
658 select SPARSEMEM_VMEMMAP
660 config ARCH_SPARSEMEM_DEFAULT
663 config ARCH_ENABLE_MEMORY_HOTPLUG
664 def_bool y if SPARSEMEM
666 config ARCH_ENABLE_MEMORY_HOTREMOVE
669 config ARCH_ENABLE_SPLIT_PMD_PTLOCK
672 config FORCE_MAX_ZONEORDER
676 config MAX_PHYSMEM_BITS
677 int "Maximum size of supported physical memory in bits (42-53)"
681 This option specifies the maximum supported size of physical memory
682 in bits. Supported is any size between 2^42 (4TB) and 2^53 (8PB).
683 Increasing the number of bits also increases the kernel image size.
684 By default 46 bits (64TB) are supported.
688 prompt "Pack kernel stack"
690 This option enables the compiler option -mkernel-backchain if it
691 is available. If the option is available the compiler supports
692 the new stack layout which dramatically reduces the minimum stack
693 frame size. With an old compiler a non-leaf function needs a
694 minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
695 -mkernel-backchain the minimum size drops to 16 byte on 31 bit
696 and 24 byte on 64 bit.
698 Say Y if you are unsure.
702 depends on !VMAP_STACK
703 prompt "Detect kernel stack overflow"
705 This option enables the compiler option -mstack-guard and
706 -mstack-size if they are available. If the compiler supports them
707 it will emit additional code to each function prolog to trigger
708 an illegal operation if the kernel stack is about to overflow.
710 Say N if you are unsure.
713 int "Size of the guard area (128-1024)"
715 depends on CHECK_STACK
718 This allows you to specify the size of the guard area at the lower
719 end of the kernel stack. If the kernel stack points into the guard
720 area on function entry an illegal operation is triggered. The size
721 needs to be a power of 2. Please keep in mind that the size of an
722 interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
723 The minimum size for the stack guard should be 256 for 31 bit and
726 config WARN_DYNAMIC_STACK
728 prompt "Emit compiler warnings for function with dynamic stack usage"
730 This option enables the compiler option -mwarn-dynamicstack. If the
731 compiler supports this options generates warnings for functions
732 that dynamically allocate stack space using alloca.
734 Say N if you are unsure.
742 prompt "QDIO support"
744 This driver provides the Queued Direct I/O base support for
747 To compile this driver as a module, choose M here: the
748 module will be called qdio.
754 config PCI_NR_FUNCTIONS
755 int "Maximum number of PCI functions (1-4096)"
759 This allows you to specify the maximum number of PCI functions which
760 this kernel will support.
769 prompt "Support for CHSC subchannels"
771 This driver allows usage of CHSC subchannels. A CHSC subchannel
772 is usually present on LPAR only.
773 The driver creates a device /dev/chsc, which may be used to
774 obtain I/O configuration information about the machine and
775 to issue asynchronous chsc commands (DANGEROUS).
776 You will usually only want to use this interface on a special
777 LPAR designated for system management.
779 To compile this driver as a module, choose M here: the
780 module will be called chsc_sch.
786 prompt "SCM bus driver"
788 Bus driver for Storage Class Memory.
792 prompt "Support for EADM subchannels"
795 This driver allows usage of EADM subchannels. EADM subchannels act
796 as a communication vehicle for SCM increments.
798 To compile this driver as a module, choose M here: the
799 module will be called eadm_sch.
803 prompt "Support for VFIO-CCW subchannels"
804 depends on S390_CCW_IOMMU && VFIO_MDEV
806 This driver allows usage of I/O subchannels via VFIO-CCW.
808 To compile this driver as a module, choose M here: the
809 module will be called vfio_ccw.
813 prompt "VFIO support for AP devices"
814 depends on S390_AP_IOMMU && VFIO_MDEV_DEVICE && KVM
816 This driver grants access to Adjunct Processor (AP) devices
817 via the VFIO mediated device interface.
819 To compile this driver as a module, choose M here: the module
820 will be called vfio_ap.
827 bool "kernel crash dumps"
830 Generate crash dump after being started by kexec.
831 Crash dump kernels are loaded in the main kernel with kexec-tools
832 into a specially reserved region and then later executed after
833 a crash by kdump/kexec.
834 Refer to <file:Documentation/s390/zfcpdump.rst> for more details on this.
835 This option also enables s390 zfcpdump.
836 See also <file:Documentation/s390/zfcpdump.rst>
842 prompt "Enable seccomp to safely compute untrusted bytecode"
845 This kernel feature is useful for number crunching applications
846 that may need to compute untrusted bytecode during their
847 execution. By using pipes or other transports made available to
848 the process as file descriptors supporting the read/write
849 syscalls, it's possible to isolate those applications in
850 their own address space using seccomp. Once seccomp is
851 enabled via /proc/<pid>/seccomp, it cannot be disabled
852 and the task is only allowed to execute a few safe syscalls
853 defined by each seccomp mode.
857 menu "Power Management"
859 config ARCH_HIBERNATION_POSSIBLE
862 source "kernel/power/Kconfig"
871 default (SMC || CCWGROUP)
873 menu "Virtualization"
875 config PROTECTED_VIRTUALIZATION_GUEST
877 prompt "Protected virtualization guest support"
879 Select this option, if you want to be able to run this
880 kernel as a protected virtualization KVM guest.
881 Protected virtualization capable machines have a mini hypervisor
882 located at machine level (an ultravisor). With help of the
883 Ultravisor, KVM will be able to run "protected" VMs, special
884 VMs whose memory and management data are unavailable to KVM.
888 prompt "Pseudo page fault support"
890 Select this option, if you want to use PFAULT pseudo page fault
891 handling under VM. If running native or in LPAR, this option
892 has no effect. If your VM does not support PFAULT, PAGEEX
893 pseudo page fault handling will be used.
894 Note that VM 4.2 supports PFAULT but has a bug in its
895 implementation that causes some problems.
896 Everybody who wants to run Linux under VM != VM4.2 should select
901 prompt "Cooperative memory management"
903 Select this option, if you want to enable the kernel interface
904 to reduce the memory size of the system. This is accomplished
905 by allocating pages of memory and put them "on hold". This only
906 makes sense for a system running under VM where the unused pages
907 will be reused by VM for other guest systems. The interface
908 allows an external monitor to balance memory of many systems.
909 Everybody who wants to run Linux under VM should select this
914 prompt "IUCV special message interface to cooperative memory management"
915 depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
917 Select this option to enable the special message interface to
918 the cooperative memory management.
922 prompt "Linux - VM Monitor Stream, base infrastructure"
925 This provides a kernel interface for creating and updating z/VM APPLDATA
926 monitor records. The monitor records are updated at certain time
927 intervals, once the timer is started.
928 Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
929 i.e. enables or disables monitoring on the Linux side.
930 A custom interval value (in seconds) can be written to
931 /proc/appldata/interval.
933 Defaults are 60 seconds interval and timer off.
934 The /proc entries can also be read from, showing the current settings.
938 prompt "Monitor memory management statistics"
939 depends on APPLDATA_BASE && VM_EVENT_COUNTERS
941 This provides memory management related data to the Linux - VM Monitor
942 Stream, like paging/swapping rate, memory utilisation, etc.
943 Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
944 APPLDATA monitor record, i.e. enables or disables monitoring this record
948 The /proc entry can also be read from, showing the current settings.
950 This can also be compiled as a module, which will be called
955 prompt "Monitor OS statistics"
956 depends on APPLDATA_BASE
958 This provides OS related data to the Linux - VM Monitor Stream, like
959 CPU utilisation, etc.
960 Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
961 APPLDATA monitor record, i.e. enables or disables monitoring this record
965 This can also be compiled as a module, which will be called
968 config APPLDATA_NET_SUM
970 prompt "Monitor overall network statistics"
971 depends on APPLDATA_BASE && NET
973 This provides network related data to the Linux - VM Monitor Stream,
974 currently there is only a total sum of network I/O statistics, no
976 Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
977 APPLDATA monitor record, i.e. enables or disables monitoring this record
981 This can also be compiled as a module, which will be called
986 prompt "s390 hypervisor file system support"
987 select SYS_HYPERVISOR
989 This is a virtual file system intended to provide accounting
990 information in an s390 hypervisor environment.
992 source "arch/s390/kvm/Kconfig"
996 prompt "s390 support for virtio devices"
998 select VIRTUALIZATION
1000 select VIRTIO_CONSOLE
1002 Enabling this option adds support for virtio based paravirtual device
1005 Select this option if you want to run the kernel as a guest under