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
33 def_bool y if PREEMPTION
47 config ARCH_SUPPORTS_UPROBES
50 config KASAN_SHADOW_OFFSET
53 default 0x18000000000000
58 # Note: keep this list sorted alphabetically
60 imply IMA_SECURE_AND_OR_TRUSTED_BOOT
61 select ARCH_32BIT_USTAT_F_TINODE
62 select ARCH_BINFMT_ELF_STATE
63 select ARCH_HAS_DEBUG_VM_PGTABLE
64 select ARCH_HAS_DEBUG_WX
65 select ARCH_HAS_DEVMEM_IS_ALLOWED
66 select ARCH_HAS_ELF_RANDOMIZE
67 select ARCH_HAS_FORCE_DMA_UNENCRYPTED
68 select ARCH_HAS_FORTIFY_SOURCE
69 select ARCH_HAS_GCOV_PROFILE_ALL
70 select ARCH_HAS_GIGANTIC_PAGE
72 select ARCH_HAS_MEM_ENCRYPT
73 select ARCH_HAS_PTE_SPECIAL
74 select ARCH_HAS_SCALED_CPUTIME
75 select ARCH_HAS_SET_MEMORY
76 select ARCH_HAS_STRICT_KERNEL_RWX
77 select ARCH_HAS_STRICT_MODULE_RWX
78 select ARCH_HAS_SYSCALL_WRAPPER
79 select ARCH_HAS_UBSAN_SANITIZE_ALL
80 select ARCH_HAS_VDSO_DATA
81 select ARCH_HAVE_NMI_SAFE_CMPXCHG
82 select ARCH_INLINE_READ_LOCK
83 select ARCH_INLINE_READ_LOCK_BH
84 select ARCH_INLINE_READ_LOCK_IRQ
85 select ARCH_INLINE_READ_LOCK_IRQSAVE
86 select ARCH_INLINE_READ_TRYLOCK
87 select ARCH_INLINE_READ_UNLOCK
88 select ARCH_INLINE_READ_UNLOCK_BH
89 select ARCH_INLINE_READ_UNLOCK_IRQ
90 select ARCH_INLINE_READ_UNLOCK_IRQRESTORE
91 select ARCH_INLINE_SPIN_LOCK
92 select ARCH_INLINE_SPIN_LOCK_BH
93 select ARCH_INLINE_SPIN_LOCK_IRQ
94 select ARCH_INLINE_SPIN_LOCK_IRQSAVE
95 select ARCH_INLINE_SPIN_TRYLOCK
96 select ARCH_INLINE_SPIN_TRYLOCK_BH
97 select ARCH_INLINE_SPIN_UNLOCK
98 select ARCH_INLINE_SPIN_UNLOCK_BH
99 select ARCH_INLINE_SPIN_UNLOCK_IRQ
100 select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE
101 select ARCH_INLINE_WRITE_LOCK
102 select ARCH_INLINE_WRITE_LOCK_BH
103 select ARCH_INLINE_WRITE_LOCK_IRQ
104 select ARCH_INLINE_WRITE_LOCK_IRQSAVE
105 select ARCH_INLINE_WRITE_TRYLOCK
106 select ARCH_INLINE_WRITE_UNLOCK
107 select ARCH_INLINE_WRITE_UNLOCK_BH
108 select ARCH_INLINE_WRITE_UNLOCK_IRQ
109 select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE
110 select ARCH_STACKWALK
111 select ARCH_SUPPORTS_ATOMIC_RMW
112 select ARCH_SUPPORTS_DEBUG_PAGEALLOC
113 select ARCH_SUPPORTS_NUMA_BALANCING
114 select ARCH_USE_BUILTIN_BSWAP
115 select ARCH_USE_CMPXCHG_LOCKREF
116 select ARCH_WANTS_DYNAMIC_TASK_STRUCT
117 select ARCH_WANT_DEFAULT_BPF_JIT
118 select ARCH_WANT_IPC_PARSE_VERSION
119 select BUILDTIME_TABLE_SORT
120 select CLONE_BACKWARDS2
121 select CPU_NO_EFFICIENT_FFS if !HAVE_MARCH_Z9_109_FEATURES
122 select DMA_OPS if PCI
123 select DYNAMIC_FTRACE if FUNCTION_TRACER
124 select GENERIC_ALLOCATOR
125 select GENERIC_CPU_AUTOPROBE
126 select GENERIC_CPU_VULNERABILITIES
128 select GENERIC_FIND_FIRST_BIT
129 select GENERIC_GETTIMEOFDAY
130 select GENERIC_PTDUMP
131 select GENERIC_SMP_IDLE_THREAD
132 select GENERIC_TIME_VSYSCALL
133 select GENERIC_VDSO_TIME_NS
134 select HAVE_ALIGNED_STRUCT_PAGE if SLUB
135 select HAVE_ARCH_AUDITSYSCALL
136 select HAVE_ARCH_JUMP_LABEL
137 select HAVE_ARCH_JUMP_LABEL_RELATIVE
138 select HAVE_ARCH_KASAN
139 select HAVE_ARCH_KASAN_VMALLOC
140 select HAVE_ARCH_SECCOMP_FILTER
141 select HAVE_ARCH_SOFT_DIRTY
142 select HAVE_ARCH_TRACEHOOK
143 select HAVE_ARCH_TRANSPARENT_HUGEPAGE
144 select HAVE_ARCH_VMAP_STACK
145 select HAVE_ASM_MODVERSIONS
146 select HAVE_CMPXCHG_DOUBLE
147 select HAVE_CMPXCHG_LOCAL
148 select HAVE_DEBUG_KMEMLEAK
149 select HAVE_DMA_CONTIGUOUS
150 select HAVE_DYNAMIC_FTRACE
151 select HAVE_DYNAMIC_FTRACE_WITH_REGS
152 select HAVE_EBPF_JIT if PACK_STACK && HAVE_MARCH_Z196_FEATURES
153 select HAVE_EFFICIENT_UNALIGNED_ACCESS
156 select HAVE_FTRACE_MCOUNT_RECORD
157 select HAVE_FUNCTION_ERROR_INJECTION
158 select HAVE_FUNCTION_GRAPH_TRACER
159 select HAVE_FUNCTION_TRACER
160 select HAVE_FUTEX_CMPXCHG if FUTEX
161 select HAVE_GCC_PLUGINS
162 select HAVE_GENERIC_VDSO
163 select HAVE_IRQ_EXIT_ON_IRQ_STACK
164 select HAVE_KERNEL_BZIP2
165 select HAVE_KERNEL_GZIP
166 select HAVE_KERNEL_LZ4
167 select HAVE_KERNEL_LZMA
168 select HAVE_KERNEL_LZO
169 select HAVE_KERNEL_UNCOMPRESSED
170 select HAVE_KERNEL_XZ
172 select HAVE_KPROBES_ON_FTRACE
173 select HAVE_KRETPROBES
175 select HAVE_LIVEPATCH
176 select HAVE_MEMBLOCK_PHYS_MAP
177 select HAVE_MOD_ARCH_SPECIFIC
179 select HAVE_NOP_MCOUNT
181 select HAVE_PERF_EVENTS
182 select HAVE_PERF_REGS
183 select HAVE_PERF_USER_STACK_DUMP
184 select HAVE_REGS_AND_STACK_ACCESS_API
185 select HAVE_RELIABLE_STACKTRACE
187 select HAVE_SYSCALL_TRACEPOINTS
188 select HAVE_VIRT_CPU_ACCOUNTING
189 select HAVE_VIRT_CPU_ACCOUNTING_IDLE
190 select IOMMU_HELPER if PCI
191 select IOMMU_SUPPORT if PCI
192 select MMU_GATHER_NO_GATHER
193 select MMU_GATHER_RCU_TABLE_FREE
194 select MODULES_USE_ELF_RELA
195 select NEED_DMA_MAP_STATE if PCI
196 select NEED_SG_DMA_LENGTH if PCI
198 select OLD_SIGSUSPEND3
199 select PCI_DOMAINS if PCI
200 select PCI_MSI if PCI
201 select PCI_MSI_ARCH_FALLBACKS if PCI_MSI
204 select SYSCTL_EXCEPTION_TRACE
205 select THREAD_INFO_IN_TASK
207 select VIRT_CPU_ACCOUNTING
208 # Note: keep the above list sorted alphabetically
210 config SCHED_OMIT_FRAME_POINTER
213 config PGTABLE_LEVELS
217 source "kernel/livepatch/Kconfig"
219 menu "Processor type and features"
221 config HAVE_MARCH_Z900_FEATURES
224 config HAVE_MARCH_Z990_FEATURES
226 select HAVE_MARCH_Z900_FEATURES
228 config HAVE_MARCH_Z9_109_FEATURES
230 select HAVE_MARCH_Z990_FEATURES
232 config HAVE_MARCH_Z10_FEATURES
234 select HAVE_MARCH_Z9_109_FEATURES
236 config HAVE_MARCH_Z196_FEATURES
238 select HAVE_MARCH_Z10_FEATURES
240 config HAVE_MARCH_ZEC12_FEATURES
242 select HAVE_MARCH_Z196_FEATURES
244 config HAVE_MARCH_Z13_FEATURES
246 select HAVE_MARCH_ZEC12_FEATURES
248 config HAVE_MARCH_Z14_FEATURES
250 select HAVE_MARCH_Z13_FEATURES
252 config HAVE_MARCH_Z15_FEATURES
254 select HAVE_MARCH_Z14_FEATURES
257 prompt "Processor type"
261 bool "IBM zSeries model z800 and z900"
262 select HAVE_MARCH_Z900_FEATURES
263 depends on $(cc-option,-march=z900)
265 Select this to enable optimizations for model z800/z900 (2064 and
266 2066 series). This will enable some optimizations that are not
267 available on older ESA/390 (31 Bit) only CPUs.
270 bool "IBM zSeries model z890 and z990"
271 select HAVE_MARCH_Z990_FEATURES
272 depends on $(cc-option,-march=z990)
274 Select this to enable optimizations for model z890/z990 (2084 and
275 2086 series). The kernel will be slightly faster but will not work
280 select HAVE_MARCH_Z9_109_FEATURES
281 depends on $(cc-option,-march=z9-109)
283 Select this to enable optimizations for IBM System z9 (2094 and
284 2096 series). The kernel will be slightly faster but will not work
288 bool "IBM System z10"
289 select HAVE_MARCH_Z10_FEATURES
290 depends on $(cc-option,-march=z10)
292 Select this to enable optimizations for IBM System z10 (2097 and
293 2098 series). The kernel will be slightly faster but will not work
297 bool "IBM zEnterprise 114 and 196"
298 select HAVE_MARCH_Z196_FEATURES
299 depends on $(cc-option,-march=z196)
301 Select this to enable optimizations for IBM zEnterprise 114 and 196
302 (2818 and 2817 series). The kernel will be slightly faster but will
303 not work on older machines.
306 bool "IBM zBC12 and zEC12"
307 select HAVE_MARCH_ZEC12_FEATURES
308 depends on $(cc-option,-march=zEC12)
310 Select this to enable optimizations for IBM zBC12 and zEC12 (2828 and
311 2827 series). The kernel will be slightly faster but will not work on
315 bool "IBM z13s and z13"
316 select HAVE_MARCH_Z13_FEATURES
317 depends on $(cc-option,-march=z13)
319 Select this to enable optimizations for IBM z13s and z13 (2965 and
320 2964 series). The kernel will be slightly faster but will not work on
324 bool "IBM z14 ZR1 and z14"
325 select HAVE_MARCH_Z14_FEATURES
326 depends on $(cc-option,-march=z14)
328 Select this to enable optimizations for IBM z14 ZR1 and z14 (3907
329 and 3906 series). The kernel will be slightly faster but will not
330 work on older machines.
334 select HAVE_MARCH_Z15_FEATURES
335 depends on $(cc-option,-march=z15)
337 Select this to enable optimizations for IBM z15 (8562
338 and 8561 series). The kernel will be slightly faster but will not
339 work on older machines.
343 config MARCH_Z900_TUNE
344 def_bool TUNE_Z900 || MARCH_Z900 && TUNE_DEFAULT
346 config MARCH_Z990_TUNE
347 def_bool TUNE_Z990 || MARCH_Z990 && TUNE_DEFAULT
349 config MARCH_Z9_109_TUNE
350 def_bool TUNE_Z9_109 || MARCH_Z9_109 && TUNE_DEFAULT
352 config MARCH_Z10_TUNE
353 def_bool TUNE_Z10 || MARCH_Z10 && TUNE_DEFAULT
355 config MARCH_Z196_TUNE
356 def_bool TUNE_Z196 || MARCH_Z196 && TUNE_DEFAULT
358 config MARCH_ZEC12_TUNE
359 def_bool TUNE_ZEC12 || MARCH_ZEC12 && TUNE_DEFAULT
361 config MARCH_Z13_TUNE
362 def_bool TUNE_Z13 || MARCH_Z13 && TUNE_DEFAULT
364 config MARCH_Z14_TUNE
365 def_bool TUNE_Z14 || MARCH_Z14 && TUNE_DEFAULT
367 config MARCH_Z15_TUNE
368 def_bool TUNE_Z15 || MARCH_Z15 && TUNE_DEFAULT
371 prompt "Tune code generation"
374 Cause the compiler to tune (-mtune) the generated code for a machine.
375 This will make the code run faster on the selected machine but
376 somewhat slower on other machines.
377 This option only changes how the compiler emits instructions, not the
378 selection of instructions itself, so the resulting kernel will run on
384 Tune the generated code for the target processor for which the kernel
388 bool "IBM zSeries model z800 and z900"
389 depends on $(cc-option,-mtune=z900)
392 bool "IBM zSeries model z890 and z990"
393 depends on $(cc-option,-mtune=z990)
397 depends on $(cc-option,-mtune=z9-109)
400 bool "IBM System z10"
401 depends on $(cc-option,-mtune=z10)
404 bool "IBM zEnterprise 114 and 196"
405 depends on $(cc-option,-mtune=z196)
408 bool "IBM zBC12 and zEC12"
409 depends on $(cc-option,-mtune=zEC12)
412 bool "IBM z13s and z13"
413 depends on $(cc-option,-mtune=z13)
416 bool "IBM z14 ZR1 and z14"
417 depends on $(cc-option,-mtune=z14)
421 depends on $(cc-option,-mtune=z15)
430 prompt "Kernel support for 31 bit emulation"
431 select ARCH_WANT_OLD_COMPAT_IPC
432 select COMPAT_OLD_SIGACTION
436 Select this option if you want to enable your system kernel to
437 handle system-calls from ELF binaries for 31 bit ESA. This option
438 (and some other stuff like libraries and such) is needed for
439 executing 31 bit applications. It is safe to say "Y".
441 config SYSVIPC_COMPAT
442 def_bool y if COMPAT && SYSVIPC
448 int "Maximum number of CPUs (2-512)"
452 This allows you to specify the maximum number of CPUs which this
453 kernel will support. The maximum supported value is 512 and the
454 minimum value which makes sense is 2.
456 This is purely to save memory - each supported CPU adds
457 approximately sixteen kilobytes to the kernel image.
464 depends on SCHED_TOPOLOGY
469 This option adds NUMA support to the kernel.
473 depends on NEED_MULTIPLE_NODES
488 config SCHED_TOPOLOGY
490 prompt "Topology scheduler support"
496 Topology scheduler support improves the CPU scheduler's decision
497 making when dealing with machines that have multi-threading,
498 multiple cores or multiple books.
500 source "kernel/Kconfig.hz"
507 bool "kexec file based system call"
511 depends on CRYPTO_SHA256
512 depends on CRYPTO_SHA256_S390
514 Enable the kexec file based system call. In contrast to the normal
515 kexec system call this system call takes file descriptors for the
516 kernel and initramfs as arguments.
518 config ARCH_HAS_KEXEC_PURGATORY
520 depends on KEXEC_FILE
523 bool "Verify kernel signature during kexec_file_load() syscall"
524 depends on KEXEC_FILE && MODULE_SIG_FORMAT
526 This option makes kernel signature verification mandatory for
527 the kexec_file_load() syscall.
529 In addition to that option, you need to enable signature
530 verification for the corresponding kernel image type being
531 loaded in order for this to work.
535 prompt "s390 architectural random number generation API"
537 Enable the s390 architectural random number generation API
538 to provide random data for all consumers within the Linux
541 When enabled the arch_random_* functions declared in linux/random.h
542 are implemented. The implementation is based on the s390 CPACF
543 instruction subfunction TRNG which provides a real true random
550 prompt "Enable modified branch prediction for the kernel by default"
552 If this option is selected the kernel will switch to a modified
553 branch prediction mode if the firmware interface is available.
554 The modified branch prediction mode improves the behaviour in
555 regard to speculative execution.
557 With the option enabled the kernel parameter "nobp=0" or "nospec"
558 can be used to run the kernel in the normal branch prediction mode.
560 With the option disabled the modified branch prediction mode is
561 enabled with the "nobp=1" kernel parameter.
567 prompt "Avoid speculative indirect branches in the kernel"
569 Compile the kernel with the expoline compiler options to guard
570 against kernel-to-user data leaks by avoiding speculative indirect
572 Requires a compiler with -mindirect-branch=thunk support for full
573 protection. The kernel may run slower.
578 prompt "Expoline default"
580 default EXPOLINE_FULL
583 bool "spectre_v2=off"
586 bool "spectre_v2=auto"
594 bool "Build a relocatable kernel"
595 select MODULE_REL_CRCS if MODVERSIONS
598 This builds a kernel image that retains relocation information
599 so it can be loaded at an arbitrary address.
600 The kernel is linked as a position-independent executable (PIE)
601 and contains dynamic relocations which are processed early in the
603 The relocations make the kernel image about 15% larger (compressed
604 10%), but are discarded at runtime.
606 config RANDOMIZE_BASE
607 bool "Randomize the address of the kernel image (KASLR)"
608 depends on RELOCATABLE
611 In support of Kernel Address Space Layout Randomization (KASLR),
612 this randomizes the address at which the kernel image is loaded,
613 as a security feature that deters exploit attempts relying on
614 knowledge of the location of kernel internals.
620 config ARCH_SPARSEMEM_ENABLE
622 select SPARSEMEM_VMEMMAP_ENABLE
623 select SPARSEMEM_VMEMMAP
625 config ARCH_SPARSEMEM_DEFAULT
628 config ARCH_ENABLE_MEMORY_HOTPLUG
629 def_bool y if SPARSEMEM
631 config ARCH_ENABLE_MEMORY_HOTREMOVE
634 config ARCH_ENABLE_SPLIT_PMD_PTLOCK
637 config MAX_PHYSMEM_BITS
638 int "Maximum size of supported physical memory in bits (42-53)"
642 This option specifies the maximum supported size of physical memory
643 in bits. Supported is any size between 2^42 (4TB) and 2^53 (8PB).
644 Increasing the number of bits also increases the kernel image size.
645 By default 46 bits (64TB) are supported.
649 prompt "Pack kernel stack"
651 This option enables the compiler option -mkernel-backchain if it
652 is available. If the option is available the compiler supports
653 the new stack layout which dramatically reduces the minimum stack
654 frame size. With an old compiler a non-leaf function needs a
655 minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
656 -mkernel-backchain the minimum size drops to 16 byte on 31 bit
657 and 24 byte on 64 bit.
659 Say Y if you are unsure.
663 depends on !VMAP_STACK
664 prompt "Detect kernel stack overflow"
666 This option enables the compiler option -mstack-guard and
667 -mstack-size if they are available. If the compiler supports them
668 it will emit additional code to each function prolog to trigger
669 an illegal operation if the kernel stack is about to overflow.
671 Say N if you are unsure.
674 int "Size of the guard area (128-1024)"
676 depends on CHECK_STACK
679 This allows you to specify the size of the guard area at the lower
680 end of the kernel stack. If the kernel stack points into the guard
681 area on function entry an illegal operation is triggered. The size
682 needs to be a power of 2. Please keep in mind that the size of an
683 interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
684 The minimum size for the stack guard should be 256 for 31 bit and
687 config WARN_DYNAMIC_STACK
689 prompt "Emit compiler warnings for function with dynamic stack usage"
691 This option enables the compiler option -mwarn-dynamicstack. If the
692 compiler supports this options generates warnings for functions
693 that dynamically allocate stack space using alloca.
695 Say N if you are unsure.
703 prompt "QDIO support"
705 This driver provides the Queued Direct I/O base support for
708 To compile this driver as a module, choose M here: the
709 module will be called qdio.
715 config PCI_NR_FUNCTIONS
716 int "Maximum number of PCI functions (1-4096)"
720 This allows you to specify the maximum number of PCI functions which
721 this kernel will support.
730 prompt "Support for CHSC subchannels"
732 This driver allows usage of CHSC subchannels. A CHSC subchannel
733 is usually present on LPAR only.
734 The driver creates a device /dev/chsc, which may be used to
735 obtain I/O configuration information about the machine and
736 to issue asynchronous chsc commands (DANGEROUS).
737 You will usually only want to use this interface on a special
738 LPAR designated for system management.
740 To compile this driver as a module, choose M here: the
741 module will be called chsc_sch.
747 prompt "SCM bus driver"
749 Bus driver for Storage Class Memory.
753 prompt "Support for EADM subchannels"
756 This driver allows usage of EADM subchannels. EADM subchannels act
757 as a communication vehicle for SCM increments.
759 To compile this driver as a module, choose M here: the
760 module will be called eadm_sch.
764 prompt "Support for VFIO-CCW subchannels"
765 depends on S390_CCW_IOMMU && VFIO_MDEV
767 This driver allows usage of I/O subchannels via VFIO-CCW.
769 To compile this driver as a module, choose M here: the
770 module will be called vfio_ccw.
774 prompt "VFIO support for AP devices"
775 depends on S390_AP_IOMMU && VFIO_MDEV_DEVICE && KVM
778 This driver grants access to Adjunct Processor (AP) devices
779 via the VFIO mediated device interface.
781 To compile this driver as a module, choose M here: the module
782 will be called vfio_ap.
789 bool "kernel crash dumps"
792 Generate crash dump after being started by kexec.
793 Crash dump kernels are loaded in the main kernel with kexec-tools
794 into a specially reserved region and then later executed after
795 a crash by kdump/kexec.
796 Refer to <file:Documentation/s390/zfcpdump.rst> for more details on this.
797 This option also enables s390 zfcpdump.
798 See also <file:Documentation/s390/zfcpdump.rst>
807 default (SMC || CCWGROUP)
809 menu "Virtualization"
811 config PROTECTED_VIRTUALIZATION_GUEST
813 prompt "Protected virtualization guest support"
814 select ARCH_HAS_RESTRICTED_VIRTIO_MEMORY_ACCESS
816 Select this option, if you want to be able to run this
817 kernel as a protected virtualization KVM guest.
818 Protected virtualization capable machines have a mini hypervisor
819 located at machine level (an ultravisor). With help of the
820 Ultravisor, KVM will be able to run "protected" VMs, special
821 VMs whose memory and management data are unavailable to KVM.
825 prompt "Pseudo page fault support"
827 Select this option, if you want to use PFAULT pseudo page fault
828 handling under VM. If running native or in LPAR, this option
829 has no effect. If your VM does not support PFAULT, PAGEEX
830 pseudo page fault handling will be used.
831 Note that VM 4.2 supports PFAULT but has a bug in its
832 implementation that causes some problems.
833 Everybody who wants to run Linux under VM != VM4.2 should select
838 prompt "Cooperative memory management"
840 Select this option, if you want to enable the kernel interface
841 to reduce the memory size of the system. This is accomplished
842 by allocating pages of memory and put them "on hold". This only
843 makes sense for a system running under VM where the unused pages
844 will be reused by VM for other guest systems. The interface
845 allows an external monitor to balance memory of many systems.
846 Everybody who wants to run Linux under VM should select this
851 prompt "IUCV special message interface to cooperative memory management"
852 depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
854 Select this option to enable the special message interface to
855 the cooperative memory management.
859 prompt "Linux - VM Monitor Stream, base infrastructure"
862 This provides a kernel interface for creating and updating z/VM APPLDATA
863 monitor records. The monitor records are updated at certain time
864 intervals, once the timer is started.
865 Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
866 i.e. enables or disables monitoring on the Linux side.
867 A custom interval value (in seconds) can be written to
868 /proc/appldata/interval.
870 Defaults are 60 seconds interval and timer off.
871 The /proc entries can also be read from, showing the current settings.
875 prompt "Monitor memory management statistics"
876 depends on APPLDATA_BASE && VM_EVENT_COUNTERS
878 This provides memory management related data to the Linux - VM Monitor
879 Stream, like paging/swapping rate, memory utilisation, etc.
880 Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
881 APPLDATA monitor record, i.e. enables or disables monitoring this record
885 The /proc entry can also be read from, showing the current settings.
887 This can also be compiled as a module, which will be called
892 prompt "Monitor OS statistics"
893 depends on APPLDATA_BASE
895 This provides OS related data to the Linux - VM Monitor Stream, like
896 CPU utilisation, etc.
897 Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
898 APPLDATA monitor record, i.e. enables or disables monitoring this record
902 This can also be compiled as a module, which will be called
905 config APPLDATA_NET_SUM
907 prompt "Monitor overall network statistics"
908 depends on APPLDATA_BASE && NET
910 This provides network related data to the Linux - VM Monitor Stream,
911 currently there is only a total sum of network I/O statistics, no
913 Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
914 APPLDATA monitor record, i.e. enables or disables monitoring this record
918 This can also be compiled as a module, which will be called
923 prompt "s390 hypervisor file system support"
924 select SYS_HYPERVISOR
926 This is a virtual file system intended to provide accounting
927 information in an s390 hypervisor environment.
929 source "arch/s390/kvm/Kconfig"
933 prompt "s390 support for virtio devices"
935 select VIRTUALIZATION
938 Enabling this option adds support for virtio based paravirtual device
941 Select this option if you want to run the kernel as a guest under
948 config S390_UNWIND_SELFTEST
950 prompt "Test unwind functions"
952 This option enables s390 specific stack unwinder testing kernel
953 module. This option is not useful for distributions or general
954 kernels, but only for kernel developers working on architecture code.
956 Say N if you are unsure.