1 # SPDX-License-Identifier: GPL-2.0
2 config ARCH_HAS_MEM_ENCRYPT
14 config LOCKDEP_SUPPORT
17 config STACKTRACE_SUPPORT
20 config ARCH_HAS_ILOG2_U32
23 config ARCH_HAS_ILOG2_U64
26 config GENERIC_HWEIGHT
32 config GENERIC_BUG_RELATIVE_POINTERS
35 config GENERIC_LOCKBREAK
41 config ARCH_SUPPORTS_DEBUG_PAGEALLOC
53 config ARCH_SUPPORTS_UPROBES
56 config KASAN_SHADOW_OFFSET
59 default 0x18000000000000 if KASAN_S390_4_LEVEL_PAGING
64 select ARCH_BINFMT_ELF_STATE
65 select ARCH_HAS_DEVMEM_IS_ALLOWED
66 select ARCH_HAS_ELF_RANDOMIZE
67 select ARCH_HAS_FORTIFY_SOURCE
68 select ARCH_HAS_GCOV_PROFILE_ALL
69 select ARCH_HAS_GIGANTIC_PAGE
71 select ARCH_HAS_PTE_SPECIAL
72 select ARCH_HAS_SET_MEMORY
73 select ARCH_HAS_STRICT_KERNEL_RWX
74 select ARCH_HAS_STRICT_MODULE_RWX
75 select ARCH_HAS_SYSCALL_WRAPPER
76 select ARCH_HAS_UBSAN_SANITIZE_ALL
77 select ARCH_HAVE_NMI_SAFE_CMPXCHG
78 select ARCH_INLINE_READ_LOCK
79 select ARCH_INLINE_READ_LOCK_BH
80 select ARCH_INLINE_READ_LOCK_IRQ
81 select ARCH_INLINE_READ_LOCK_IRQSAVE
82 select ARCH_INLINE_READ_TRYLOCK
83 select ARCH_INLINE_READ_UNLOCK
84 select ARCH_INLINE_READ_UNLOCK_BH
85 select ARCH_INLINE_READ_UNLOCK_IRQ
86 select ARCH_INLINE_READ_UNLOCK_IRQRESTORE
87 select ARCH_INLINE_SPIN_LOCK
88 select ARCH_INLINE_SPIN_LOCK_BH
89 select ARCH_INLINE_SPIN_LOCK_IRQ
90 select ARCH_INLINE_SPIN_LOCK_IRQSAVE
91 select ARCH_INLINE_SPIN_TRYLOCK
92 select ARCH_INLINE_SPIN_TRYLOCK_BH
93 select ARCH_INLINE_SPIN_UNLOCK
94 select ARCH_INLINE_SPIN_UNLOCK_BH
95 select ARCH_INLINE_SPIN_UNLOCK_IRQ
96 select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE
97 select ARCH_INLINE_WRITE_LOCK
98 select ARCH_INLINE_WRITE_LOCK_BH
99 select ARCH_INLINE_WRITE_LOCK_IRQ
100 select ARCH_INLINE_WRITE_LOCK_IRQSAVE
101 select ARCH_INLINE_WRITE_TRYLOCK
102 select ARCH_INLINE_WRITE_UNLOCK
103 select ARCH_INLINE_WRITE_UNLOCK_BH
104 select ARCH_INLINE_WRITE_UNLOCK_IRQ
105 select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE
106 select ARCH_KEEP_MEMBLOCK
107 select ARCH_SAVE_PAGE_KEYS if HIBERNATION
108 select ARCH_STACKWALK
109 select ARCH_SUPPORTS_ATOMIC_RMW
110 select ARCH_SUPPORTS_NUMA_BALANCING
111 select ARCH_USE_BUILTIN_BSWAP
112 select ARCH_USE_CMPXCHG_LOCKREF
113 select ARCH_WANTS_DYNAMIC_TASK_STRUCT
114 select ARCH_WANT_IPC_PARSE_VERSION
115 select BUILDTIME_EXTABLE_SORT
116 select CLONE_BACKWARDS2
117 select DYNAMIC_FTRACE if FUNCTION_TRACER
118 select GENERIC_CLOCKEVENTS
119 select GENERIC_CPU_AUTOPROBE
120 select GENERIC_CPU_VULNERABILITIES
121 select GENERIC_FIND_FIRST_BIT
122 select GENERIC_SMP_IDLE_THREAD
123 select GENERIC_TIME_VSYSCALL
124 select HAVE_ALIGNED_STRUCT_PAGE if SLUB
125 select HAVE_ARCH_AUDITSYSCALL
126 select HAVE_ARCH_JUMP_LABEL
127 select HAVE_ARCH_JUMP_LABEL_RELATIVE
128 select HAVE_ARCH_KASAN
129 select CPU_NO_EFFICIENT_FFS if !HAVE_MARCH_Z9_109_FEATURES
130 select HAVE_ARCH_SECCOMP_FILTER
131 select HAVE_ARCH_SOFT_DIRTY
132 select HAVE_ARCH_TRACEHOOK
133 select HAVE_ARCH_TRANSPARENT_HUGEPAGE
134 select HAVE_ARCH_VMAP_STACK
135 select HAVE_EBPF_JIT if PACK_STACK && HAVE_MARCH_Z196_FEATURES
136 select HAVE_CMPXCHG_DOUBLE
137 select HAVE_CMPXCHG_LOCAL
138 select HAVE_COPY_THREAD_TLS
139 select HAVE_DEBUG_KMEMLEAK
140 select HAVE_DMA_CONTIGUOUS
141 select HAVE_DYNAMIC_FTRACE
142 select HAVE_DYNAMIC_FTRACE_WITH_REGS
144 select HAVE_EFFICIENT_UNALIGNED_ACCESS
146 select HAVE_FTRACE_MCOUNT_RECORD
147 select HAVE_FUNCTION_GRAPH_TRACER
148 select HAVE_FUNCTION_TRACER
149 select HAVE_FUTEX_CMPXCHG if FUTEX
150 select HAVE_GCC_PLUGINS
151 select HAVE_KERNEL_BZIP2
152 select HAVE_KERNEL_GZIP
153 select HAVE_KERNEL_LZ4
154 select HAVE_KERNEL_LZMA
155 select HAVE_KERNEL_LZO
156 select HAVE_KERNEL_UNCOMPRESSED
157 select HAVE_KERNEL_XZ
159 select HAVE_KRETPROBES
161 select HAVE_LIVEPATCH
162 select HAVE_PERF_REGS
163 select HAVE_PERF_USER_STACK_DUMP
164 select HAVE_MEMBLOCK_NODE_MAP
165 select HAVE_MEMBLOCK_PHYS_MAP
166 select HAVE_MMU_GATHER_NO_GATHER
167 select HAVE_MOD_ARCH_SPECIFIC
168 select HAVE_NOP_MCOUNT
171 select HAVE_PERF_EVENTS
172 select HAVE_RCU_TABLE_FREE
173 select HAVE_REGS_AND_STACK_ACCESS_API
175 select HAVE_SYSCALL_TRACEPOINTS
176 select HAVE_VIRT_CPU_ACCOUNTING
177 select IOMMU_HELPER if PCI
178 select IOMMU_SUPPORT if PCI
179 select MODULES_USE_ELF_RELA
180 select NEED_DMA_MAP_STATE if PCI
181 select NEED_SG_DMA_LENGTH if PCI
183 select OLD_SIGSUSPEND3
184 select PCI_DOMAINS if PCI
185 select PCI_MSI if PCI
187 select SYSCTL_EXCEPTION_TRACE
188 select THREAD_INFO_IN_TASK
190 select VIRT_CPU_ACCOUNTING
191 select ARCH_HAS_SCALED_CPUTIME
193 select ARCH_HAS_FORCE_DMA_UNENCRYPTED
195 select GENERIC_ALLOCATOR
198 config SCHED_OMIT_FRAME_POINTER
201 config PGTABLE_LEVELS
205 source "kernel/livepatch/Kconfig"
207 menu "Processor type and features"
209 config HAVE_MARCH_Z900_FEATURES
212 config HAVE_MARCH_Z990_FEATURES
214 select HAVE_MARCH_Z900_FEATURES
216 config HAVE_MARCH_Z9_109_FEATURES
218 select HAVE_MARCH_Z990_FEATURES
220 config HAVE_MARCH_Z10_FEATURES
222 select HAVE_MARCH_Z9_109_FEATURES
224 config HAVE_MARCH_Z196_FEATURES
226 select HAVE_MARCH_Z10_FEATURES
228 config HAVE_MARCH_ZEC12_FEATURES
230 select HAVE_MARCH_Z196_FEATURES
232 config HAVE_MARCH_Z13_FEATURES
234 select HAVE_MARCH_ZEC12_FEATURES
236 config HAVE_MARCH_Z14_FEATURES
238 select HAVE_MARCH_Z13_FEATURES
240 config HAVE_MARCH_Z15_FEATURES
242 select HAVE_MARCH_Z14_FEATURES
245 prompt "Processor type"
249 bool "IBM zSeries model z800 and z900"
250 depends on !CC_IS_CLANG
251 select HAVE_MARCH_Z900_FEATURES
253 Select this to enable optimizations for model z800/z900 (2064 and
254 2066 series). This will enable some optimizations that are not
255 available on older ESA/390 (31 Bit) only CPUs.
258 bool "IBM zSeries model z890 and z990"
259 depends on !CC_IS_CLANG
260 select HAVE_MARCH_Z990_FEATURES
262 Select this to enable optimizations for model z890/z990 (2084 and
263 2086 series). The kernel will be slightly faster but will not work
268 depends on !CC_IS_CLANG
269 select HAVE_MARCH_Z9_109_FEATURES
271 Select this to enable optimizations for IBM System z9 (2094 and
272 2096 series). The kernel will be slightly faster but will not work
276 bool "IBM System z10"
277 select HAVE_MARCH_Z10_FEATURES
279 Select this to enable optimizations for IBM System z10 (2097 and
280 2098 series). The kernel will be slightly faster but will not work
284 bool "IBM zEnterprise 114 and 196"
285 select HAVE_MARCH_Z196_FEATURES
287 Select this to enable optimizations for IBM zEnterprise 114 and 196
288 (2818 and 2817 series). The kernel will be slightly faster but will
289 not work on older machines.
292 bool "IBM zBC12 and zEC12"
293 select HAVE_MARCH_ZEC12_FEATURES
295 Select this to enable optimizations for IBM zBC12 and zEC12 (2828 and
296 2827 series). The kernel will be slightly faster but will not work on
300 bool "IBM z13s and z13"
301 select HAVE_MARCH_Z13_FEATURES
303 Select this to enable optimizations for IBM z13s and z13 (2965 and
304 2964 series). The kernel will be slightly faster but will not work on
308 bool "IBM z14 ZR1 and z14"
309 select HAVE_MARCH_Z14_FEATURES
311 Select this to enable optimizations for IBM z14 ZR1 and z14 (3907
312 and 3906 series). The kernel will be slightly faster but will not
313 work on older machines.
317 select HAVE_MARCH_Z15_FEATURES
319 Select this to enable optimizations for IBM z15 (8562
320 and 8561 series). The kernel will be slightly faster but will not
321 work on older machines.
325 config MARCH_Z900_TUNE
326 def_bool TUNE_Z900 || MARCH_Z900 && TUNE_DEFAULT
328 config MARCH_Z990_TUNE
329 def_bool TUNE_Z990 || MARCH_Z990 && TUNE_DEFAULT
331 config MARCH_Z9_109_TUNE
332 def_bool TUNE_Z9_109 || MARCH_Z9_109 && TUNE_DEFAULT
334 config MARCH_Z10_TUNE
335 def_bool TUNE_Z10 || MARCH_Z10 && TUNE_DEFAULT
337 config MARCH_Z196_TUNE
338 def_bool TUNE_Z196 || MARCH_Z196 && TUNE_DEFAULT
340 config MARCH_ZEC12_TUNE
341 def_bool TUNE_ZEC12 || MARCH_ZEC12 && TUNE_DEFAULT
343 config MARCH_Z13_TUNE
344 def_bool TUNE_Z13 || MARCH_Z13 && TUNE_DEFAULT
346 config MARCH_Z14_TUNE
347 def_bool TUNE_Z14 || MARCH_Z14 && TUNE_DEFAULT
349 config MARCH_Z15_TUNE
350 def_bool TUNE_Z15 || MARCH_Z15 && TUNE_DEFAULT
353 prompt "Tune code generation"
356 Cause the compiler to tune (-mtune) the generated code for a machine.
357 This will make the code run faster on the selected machine but
358 somewhat slower on other machines.
359 This option only changes how the compiler emits instructions, not the
360 selection of instructions itself, so the resulting kernel will run on
366 Tune the generated code for the target processor for which the kernel
370 bool "IBM zSeries model z800 and z900"
371 depends on !CC_IS_CLANG
374 bool "IBM zSeries model z890 and z990"
375 depends on !CC_IS_CLANG
379 depends on !CC_IS_CLANG
382 bool "IBM System z10"
385 bool "IBM zEnterprise 114 and 196"
388 bool "IBM zBC12 and zEC12"
406 prompt "Kernel support for 31 bit emulation"
407 select COMPAT_BINFMT_ELF if BINFMT_ELF
408 select ARCH_WANT_OLD_COMPAT_IPC
409 select COMPAT_OLD_SIGACTION
413 Select this option if you want to enable your system kernel to
414 handle system-calls from ELF binaries for 31 bit ESA. This option
415 (and some other stuff like libraries and such) is needed for
416 executing 31 bit applications. It is safe to say "Y".
419 def_bool COMPAT && !CC_IS_CLANG
421 config SYSVIPC_COMPAT
422 def_bool y if COMPAT && SYSVIPC
428 int "Maximum number of CPUs (2-512)"
432 This allows you to specify the maximum number of CPUs which this
433 kernel will support. The maximum supported value is 512 and the
434 minimum value which makes sense is 2.
436 This is purely to save memory - each supported CPU adds
437 approximately sixteen kilobytes to the kernel image.
442 # Some NUMA nodes have memory ranges that span
443 # other nodes. Even though a pfn is valid and
444 # between a node's start and end pfns, it may not
445 # reside on that node. See memmap_init_zone()
446 # for details. <- They meant memory holes!
447 config NODES_SPAN_OTHER_NODES
452 depends on SCHED_TOPOLOGY
457 This option adds NUMA support to the kernel.
459 An operation mode can be selected by appending
460 numa=<method> to the kernel command line.
462 The default behaviour is identical to appending numa=plain to
463 the command line. This will create just one node with all
464 available memory and all CPUs in it.
467 int "Maximum NUMA nodes (as a power of 2)"
472 Specify the maximum number of NUMA nodes available on the target
473 system. Increases memory reserved to accommodate various tables.
475 menu "Select NUMA modes"
479 bool "NUMA emulation"
482 Numa emulation mode will split the available system memory into
483 equal chunks which then are distributed over the configured number
484 of nodes in a round-robin manner.
486 The number of fake nodes is limited by the number of available memory
487 chunks (i.e. memory size / fake size) and the number of supported
490 The CPUs are assigned to the nodes in a way that partially respects
491 the original machine topology (if supported by the machine).
492 Fair distribution of the CPUs is not guaranteed.
495 hex "NUMA emulation memory chunk size"
497 range 0x400000 0x100000000
500 Select the default size by which the memory is chopped and then
501 assigned to emulated NUMA nodes.
503 This can be overridden by specifying
507 on the kernel command line where also suffixes K, M, G, and T are
524 config SCHED_TOPOLOGY
526 prompt "Topology scheduler support"
532 Topology scheduler support improves the CPU scheduler's decision
533 making when dealing with machines that have multi-threading,
534 multiple cores or multiple books.
536 source "kernel/Kconfig.hz"
543 bool "kexec file based system call"
547 depends on CRYPTO_SHA256
548 depends on CRYPTO_SHA256_S390
550 Enable the kexec file based system call. In contrast to the normal
551 kexec system call this system call takes file descriptors for the
552 kernel and initramfs as arguments.
554 config ARCH_HAS_KEXEC_PURGATORY
556 depends on KEXEC_FILE
558 config KEXEC_VERIFY_SIG
559 bool "Verify kernel signature during kexec_file_load() syscall"
560 depends on KEXEC_FILE && SYSTEM_DATA_VERIFICATION
562 This option makes kernel signature verification mandatory for
563 the kexec_file_load() syscall.
565 In addition to that option, you need to enable signature
566 verification for the corresponding kernel image type being
567 loaded in order for this to work.
571 prompt "s390 architectural random number generation API"
573 Enable the s390 architectural random number generation API
574 to provide random data for all consumers within the Linux
577 When enabled the arch_random_* functions declared in linux/random.h
578 are implemented. The implementation is based on the s390 CPACF
579 instruction subfunction TRNG which provides a real true random
586 prompt "Enable modified branch prediction for the kernel by default"
588 If this option is selected the kernel will switch to a modified
589 branch prediction mode if the firmware interface is available.
590 The modified branch prediction mode improves the behaviour in
591 regard to speculative execution.
593 With the option enabled the kernel parameter "nobp=0" or "nospec"
594 can be used to run the kernel in the normal branch prediction mode.
596 With the option disabled the modified branch prediction mode is
597 enabled with the "nobp=1" kernel parameter.
603 prompt "Avoid speculative indirect branches in the kernel"
605 Compile the kernel with the expoline compiler options to guard
606 against kernel-to-user data leaks by avoiding speculative indirect
608 Requires a compiler with -mindirect-branch=thunk support for full
609 protection. The kernel may run slower.
614 prompt "Expoline default"
616 default EXPOLINE_FULL
619 bool "spectre_v2=off"
622 bool "spectre_v2=auto"
630 bool "Build a relocatable kernel"
631 select MODULE_REL_CRCS if MODVERSIONS
634 This builds a kernel image that retains relocation information
635 so it can be loaded at an arbitrary address.
636 The kernel is linked as a position-independent executable (PIE)
637 and contains dynamic relocations which are processed early in the
639 The relocations make the kernel image about 15% larger (compressed
640 10%), but are discarded at runtime.
642 config RANDOMIZE_BASE
643 bool "Randomize the address of the kernel image (KASLR)"
644 depends on RELOCATABLE
647 In support of Kernel Address Space Layout Randomization (KASLR),
648 this randomizes the address at which the kernel image is loaded,
649 as a security feature that deters exploit attempts relying on
650 knowledge of the location of kernel internals.
656 config ARCH_SPARSEMEM_ENABLE
658 select SPARSEMEM_VMEMMAP_ENABLE
659 select SPARSEMEM_VMEMMAP
661 config ARCH_SPARSEMEM_DEFAULT
664 config ARCH_ENABLE_MEMORY_HOTPLUG
665 def_bool y if SPARSEMEM
667 config ARCH_ENABLE_MEMORY_HOTREMOVE
670 config ARCH_ENABLE_SPLIT_PMD_PTLOCK
673 config FORCE_MAX_ZONEORDER
677 config MAX_PHYSMEM_BITS
678 int "Maximum size of supported physical memory in bits (42-53)"
682 This option specifies the maximum supported size of physical memory
683 in bits. Supported is any size between 2^42 (4TB) and 2^53 (8PB).
684 Increasing the number of bits also increases the kernel image size.
685 By default 46 bits (64TB) are supported.
689 prompt "Pack kernel stack"
691 This option enables the compiler option -mkernel-backchain if it
692 is available. If the option is available the compiler supports
693 the new stack layout which dramatically reduces the minimum stack
694 frame size. With an old compiler a non-leaf function needs a
695 minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
696 -mkernel-backchain the minimum size drops to 16 byte on 31 bit
697 and 24 byte on 64 bit.
699 Say Y if you are unsure.
703 depends on !VMAP_STACK
704 prompt "Detect kernel stack overflow"
706 This option enables the compiler option -mstack-guard and
707 -mstack-size if they are available. If the compiler supports them
708 it will emit additional code to each function prolog to trigger
709 an illegal operation if the kernel stack is about to overflow.
711 Say N if you are unsure.
714 int "Size of the guard area (128-1024)"
716 depends on CHECK_STACK
719 This allows you to specify the size of the guard area at the lower
720 end of the kernel stack. If the kernel stack points into the guard
721 area on function entry an illegal operation is triggered. The size
722 needs to be a power of 2. Please keep in mind that the size of an
723 interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
724 The minimum size for the stack guard should be 256 for 31 bit and
727 config WARN_DYNAMIC_STACK
729 prompt "Emit compiler warnings for function with dynamic stack usage"
731 This option enables the compiler option -mwarn-dynamicstack. If the
732 compiler supports this options generates warnings for functions
733 that dynamically allocate stack space using alloca.
735 Say N if you are unsure.
743 prompt "QDIO support"
745 This driver provides the Queued Direct I/O base support for
748 To compile this driver as a module, choose M here: the
749 module will be called qdio.
755 config PCI_NR_FUNCTIONS
756 int "Maximum number of PCI functions (1-4096)"
760 This allows you to specify the maximum number of PCI functions which
761 this kernel will support.
770 prompt "Support for CHSC subchannels"
772 This driver allows usage of CHSC subchannels. A CHSC subchannel
773 is usually present on LPAR only.
774 The driver creates a device /dev/chsc, which may be used to
775 obtain I/O configuration information about the machine and
776 to issue asynchronous chsc commands (DANGEROUS).
777 You will usually only want to use this interface on a special
778 LPAR designated for system management.
780 To compile this driver as a module, choose M here: the
781 module will be called chsc_sch.
787 prompt "SCM bus driver"
789 Bus driver for Storage Class Memory.
793 prompt "Support for EADM subchannels"
796 This driver allows usage of EADM subchannels. EADM subchannels act
797 as a communication vehicle for SCM increments.
799 To compile this driver as a module, choose M here: the
800 module will be called eadm_sch.
804 prompt "Support for VFIO-CCW subchannels"
805 depends on S390_CCW_IOMMU && VFIO_MDEV
807 This driver allows usage of I/O subchannels via VFIO-CCW.
809 To compile this driver as a module, choose M here: the
810 module will be called vfio_ccw.
814 prompt "VFIO support for AP devices"
815 depends on S390_AP_IOMMU && VFIO_MDEV_DEVICE && KVM
817 This driver grants access to Adjunct Processor (AP) devices
818 via the VFIO mediated device interface.
820 To compile this driver as a module, choose M here: the module
821 will be called vfio_ap.
828 bool "kernel crash dumps"
831 Generate crash dump after being started by kexec.
832 Crash dump kernels are loaded in the main kernel with kexec-tools
833 into a specially reserved region and then later executed after
834 a crash by kdump/kexec.
835 Refer to <file:Documentation/s390/zfcpdump.rst> for more details on this.
836 This option also enables s390 zfcpdump.
837 See also <file:Documentation/s390/zfcpdump.rst>
843 prompt "Enable seccomp to safely compute untrusted bytecode"
846 This kernel feature is useful for number crunching applications
847 that may need to compute untrusted bytecode during their
848 execution. By using pipes or other transports made available to
849 the process as file descriptors supporting the read/write
850 syscalls, it's possible to isolate those applications in
851 their own address space using seccomp. Once seccomp is
852 enabled via /proc/<pid>/seccomp, it cannot be disabled
853 and the task is only allowed to execute a few safe syscalls
854 defined by each seccomp mode.
858 menu "Power Management"
860 config ARCH_HIBERNATION_POSSIBLE
863 source "kernel/power/Kconfig"
872 default (SMC || CCWGROUP)
874 menu "Virtualization"
876 config PROTECTED_VIRTUALIZATION_GUEST
878 prompt "Protected virtualization guest support"
880 Select this option, if you want to be able to run this
881 kernel as a protected virtualization KVM guest.
882 Protected virtualization capable machines have a mini hypervisor
883 located at machine level (an ultravisor). With help of the
884 Ultravisor, KVM will be able to run "protected" VMs, special
885 VMs whose memory and management data are unavailable to KVM.
889 prompt "Pseudo page fault support"
891 Select this option, if you want to use PFAULT pseudo page fault
892 handling under VM. If running native or in LPAR, this option
893 has no effect. If your VM does not support PFAULT, PAGEEX
894 pseudo page fault handling will be used.
895 Note that VM 4.2 supports PFAULT but has a bug in its
896 implementation that causes some problems.
897 Everybody who wants to run Linux under VM != VM4.2 should select
902 prompt "Cooperative memory management"
904 Select this option, if you want to enable the kernel interface
905 to reduce the memory size of the system. This is accomplished
906 by allocating pages of memory and put them "on hold". This only
907 makes sense for a system running under VM where the unused pages
908 will be reused by VM for other guest systems. The interface
909 allows an external monitor to balance memory of many systems.
910 Everybody who wants to run Linux under VM should select this
915 prompt "IUCV special message interface to cooperative memory management"
916 depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
918 Select this option to enable the special message interface to
919 the cooperative memory management.
923 prompt "Linux - VM Monitor Stream, base infrastructure"
926 This provides a kernel interface for creating and updating z/VM APPLDATA
927 monitor records. The monitor records are updated at certain time
928 intervals, once the timer is started.
929 Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
930 i.e. enables or disables monitoring on the Linux side.
931 A custom interval value (in seconds) can be written to
932 /proc/appldata/interval.
934 Defaults are 60 seconds interval and timer off.
935 The /proc entries can also be read from, showing the current settings.
939 prompt "Monitor memory management statistics"
940 depends on APPLDATA_BASE && VM_EVENT_COUNTERS
942 This provides memory management related data to the Linux - VM Monitor
943 Stream, like paging/swapping rate, memory utilisation, etc.
944 Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
945 APPLDATA monitor record, i.e. enables or disables monitoring this record
949 The /proc entry can also be read from, showing the current settings.
951 This can also be compiled as a module, which will be called
956 prompt "Monitor OS statistics"
957 depends on APPLDATA_BASE
959 This provides OS related data to the Linux - VM Monitor Stream, like
960 CPU utilisation, etc.
961 Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
962 APPLDATA monitor record, i.e. enables or disables monitoring this record
966 This can also be compiled as a module, which will be called
969 config APPLDATA_NET_SUM
971 prompt "Monitor overall network statistics"
972 depends on APPLDATA_BASE && NET
974 This provides network related data to the Linux - VM Monitor Stream,
975 currently there is only a total sum of network I/O statistics, no
977 Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
978 APPLDATA monitor record, i.e. enables or disables monitoring this record
982 This can also be compiled as a module, which will be called
987 prompt "s390 hypervisor file system support"
988 select SYS_HYPERVISOR
990 This is a virtual file system intended to provide accounting
991 information in an s390 hypervisor environment.
993 source "arch/s390/kvm/Kconfig"
997 prompt "s390 support for virtio devices"
999 select VIRTUALIZATION
1001 select VIRTIO_CONSOLE
1003 Enabling this option adds support for virtio based paravirtual device
1006 Select this option if you want to run the kernel as a guest under