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_SOFTIRQ_ON_OWN_STACK
188 select HAVE_SYSCALL_TRACEPOINTS
189 select HAVE_VIRT_CPU_ACCOUNTING
190 select HAVE_VIRT_CPU_ACCOUNTING_IDLE
191 select IOMMU_HELPER if PCI
192 select IOMMU_SUPPORT if PCI
193 select MMU_GATHER_NO_GATHER
194 select MMU_GATHER_RCU_TABLE_FREE
195 select MODULES_USE_ELF_RELA
196 select NEED_DMA_MAP_STATE if PCI
197 select NEED_SG_DMA_LENGTH if PCI
199 select OLD_SIGSUSPEND3
200 select PCI_DOMAINS if PCI
201 select PCI_MSI if PCI
202 select PCI_MSI_ARCH_FALLBACKS if PCI_MSI
205 select SYSCTL_EXCEPTION_TRACE
206 select THREAD_INFO_IN_TASK
208 select VIRT_CPU_ACCOUNTING
209 # Note: keep the above list sorted alphabetically
211 config SCHED_OMIT_FRAME_POINTER
214 config PGTABLE_LEVELS
218 source "kernel/livepatch/Kconfig"
220 menu "Processor type and features"
222 config HAVE_MARCH_Z900_FEATURES
225 config HAVE_MARCH_Z990_FEATURES
227 select HAVE_MARCH_Z900_FEATURES
229 config HAVE_MARCH_Z9_109_FEATURES
231 select HAVE_MARCH_Z990_FEATURES
233 config HAVE_MARCH_Z10_FEATURES
235 select HAVE_MARCH_Z9_109_FEATURES
237 config HAVE_MARCH_Z196_FEATURES
239 select HAVE_MARCH_Z10_FEATURES
241 config HAVE_MARCH_ZEC12_FEATURES
243 select HAVE_MARCH_Z196_FEATURES
245 config HAVE_MARCH_Z13_FEATURES
247 select HAVE_MARCH_ZEC12_FEATURES
249 config HAVE_MARCH_Z14_FEATURES
251 select HAVE_MARCH_Z13_FEATURES
253 config HAVE_MARCH_Z15_FEATURES
255 select HAVE_MARCH_Z14_FEATURES
258 prompt "Processor type"
262 bool "IBM zSeries model z800 and z900"
263 select HAVE_MARCH_Z900_FEATURES
264 depends on $(cc-option,-march=z900)
266 Select this to enable optimizations for model z800/z900 (2064 and
267 2066 series). This will enable some optimizations that are not
268 available on older ESA/390 (31 Bit) only CPUs.
271 bool "IBM zSeries model z890 and z990"
272 select HAVE_MARCH_Z990_FEATURES
273 depends on $(cc-option,-march=z990)
275 Select this to enable optimizations for model z890/z990 (2084 and
276 2086 series). The kernel will be slightly faster but will not work
281 select HAVE_MARCH_Z9_109_FEATURES
282 depends on $(cc-option,-march=z9-109)
284 Select this to enable optimizations for IBM System z9 (2094 and
285 2096 series). The kernel will be slightly faster but will not work
289 bool "IBM System z10"
290 select HAVE_MARCH_Z10_FEATURES
291 depends on $(cc-option,-march=z10)
293 Select this to enable optimizations for IBM System z10 (2097 and
294 2098 series). The kernel will be slightly faster but will not work
298 bool "IBM zEnterprise 114 and 196"
299 select HAVE_MARCH_Z196_FEATURES
300 depends on $(cc-option,-march=z196)
302 Select this to enable optimizations for IBM zEnterprise 114 and 196
303 (2818 and 2817 series). The kernel will be slightly faster but will
304 not work on older machines.
307 bool "IBM zBC12 and zEC12"
308 select HAVE_MARCH_ZEC12_FEATURES
309 depends on $(cc-option,-march=zEC12)
311 Select this to enable optimizations for IBM zBC12 and zEC12 (2828 and
312 2827 series). The kernel will be slightly faster but will not work on
316 bool "IBM z13s and z13"
317 select HAVE_MARCH_Z13_FEATURES
318 depends on $(cc-option,-march=z13)
320 Select this to enable optimizations for IBM z13s and z13 (2965 and
321 2964 series). The kernel will be slightly faster but will not work on
325 bool "IBM z14 ZR1 and z14"
326 select HAVE_MARCH_Z14_FEATURES
327 depends on $(cc-option,-march=z14)
329 Select this to enable optimizations for IBM z14 ZR1 and z14 (3907
330 and 3906 series). The kernel will be slightly faster but will not
331 work on older machines.
335 select HAVE_MARCH_Z15_FEATURES
336 depends on $(cc-option,-march=z15)
338 Select this to enable optimizations for IBM z15 (8562
339 and 8561 series). The kernel will be slightly faster but will not
340 work on older machines.
344 config MARCH_Z900_TUNE
345 def_bool TUNE_Z900 || MARCH_Z900 && TUNE_DEFAULT
347 config MARCH_Z990_TUNE
348 def_bool TUNE_Z990 || MARCH_Z990 && TUNE_DEFAULT
350 config MARCH_Z9_109_TUNE
351 def_bool TUNE_Z9_109 || MARCH_Z9_109 && TUNE_DEFAULT
353 config MARCH_Z10_TUNE
354 def_bool TUNE_Z10 || MARCH_Z10 && TUNE_DEFAULT
356 config MARCH_Z196_TUNE
357 def_bool TUNE_Z196 || MARCH_Z196 && TUNE_DEFAULT
359 config MARCH_ZEC12_TUNE
360 def_bool TUNE_ZEC12 || MARCH_ZEC12 && TUNE_DEFAULT
362 config MARCH_Z13_TUNE
363 def_bool TUNE_Z13 || MARCH_Z13 && TUNE_DEFAULT
365 config MARCH_Z14_TUNE
366 def_bool TUNE_Z14 || MARCH_Z14 && TUNE_DEFAULT
368 config MARCH_Z15_TUNE
369 def_bool TUNE_Z15 || MARCH_Z15 && TUNE_DEFAULT
372 prompt "Tune code generation"
375 Cause the compiler to tune (-mtune) the generated code for a machine.
376 This will make the code run faster on the selected machine but
377 somewhat slower on other machines.
378 This option only changes how the compiler emits instructions, not the
379 selection of instructions itself, so the resulting kernel will run on
385 Tune the generated code for the target processor for which the kernel
389 bool "IBM zSeries model z800 and z900"
390 depends on $(cc-option,-mtune=z900)
393 bool "IBM zSeries model z890 and z990"
394 depends on $(cc-option,-mtune=z990)
398 depends on $(cc-option,-mtune=z9-109)
401 bool "IBM System z10"
402 depends on $(cc-option,-mtune=z10)
405 bool "IBM zEnterprise 114 and 196"
406 depends on $(cc-option,-mtune=z196)
409 bool "IBM zBC12 and zEC12"
410 depends on $(cc-option,-mtune=zEC12)
413 bool "IBM z13s and z13"
414 depends on $(cc-option,-mtune=z13)
417 bool "IBM z14 ZR1 and z14"
418 depends on $(cc-option,-mtune=z14)
422 depends on $(cc-option,-mtune=z15)
431 prompt "Kernel support for 31 bit emulation"
432 select ARCH_WANT_OLD_COMPAT_IPC
433 select COMPAT_OLD_SIGACTION
437 Select this option if you want to enable your system kernel to
438 handle system-calls from ELF binaries for 31 bit ESA. This option
439 (and some other stuff like libraries and such) is needed for
440 executing 31 bit applications. It is safe to say "Y".
442 config SYSVIPC_COMPAT
443 def_bool y if COMPAT && SYSVIPC
449 int "Maximum number of CPUs (2-512)"
453 This allows you to specify the maximum number of CPUs which this
454 kernel will support. The maximum supported value is 512 and the
455 minimum value which makes sense is 2.
457 This is purely to save memory - each supported CPU adds
458 approximately sixteen kilobytes to the kernel image.
465 depends on SCHED_TOPOLOGY
470 This option adds NUMA support to the kernel.
474 depends on NEED_MULTIPLE_NODES
489 config SCHED_TOPOLOGY
491 prompt "Topology scheduler support"
497 Topology scheduler support improves the CPU scheduler's decision
498 making when dealing with machines that have multi-threading,
499 multiple cores or multiple books.
501 source "kernel/Kconfig.hz"
508 bool "kexec file based system call"
512 depends on CRYPTO_SHA256
513 depends on CRYPTO_SHA256_S390
515 Enable the kexec file based system call. In contrast to the normal
516 kexec system call this system call takes file descriptors for the
517 kernel and initramfs as arguments.
519 config ARCH_HAS_KEXEC_PURGATORY
521 depends on KEXEC_FILE
524 bool "Verify kernel signature during kexec_file_load() syscall"
525 depends on KEXEC_FILE && MODULE_SIG_FORMAT
527 This option makes kernel signature verification mandatory for
528 the kexec_file_load() syscall.
530 In addition to that option, you need to enable signature
531 verification for the corresponding kernel image type being
532 loaded in order for this to work.
536 prompt "s390 architectural random number generation API"
538 Enable the s390 architectural random number generation API
539 to provide random data for all consumers within the Linux
542 When enabled the arch_random_* functions declared in linux/random.h
543 are implemented. The implementation is based on the s390 CPACF
544 instruction subfunction TRNG which provides a real true random
551 prompt "Enable modified branch prediction for the kernel by default"
553 If this option is selected the kernel will switch to a modified
554 branch prediction mode if the firmware interface is available.
555 The modified branch prediction mode improves the behaviour in
556 regard to speculative execution.
558 With the option enabled the kernel parameter "nobp=0" or "nospec"
559 can be used to run the kernel in the normal branch prediction mode.
561 With the option disabled the modified branch prediction mode is
562 enabled with the "nobp=1" kernel parameter.
568 prompt "Avoid speculative indirect branches in the kernel"
570 Compile the kernel with the expoline compiler options to guard
571 against kernel-to-user data leaks by avoiding speculative indirect
573 Requires a compiler with -mindirect-branch=thunk support for full
574 protection. The kernel may run slower.
579 prompt "Expoline default"
581 default EXPOLINE_FULL
584 bool "spectre_v2=off"
587 bool "spectre_v2=auto"
595 bool "Build a relocatable kernel"
596 select MODULE_REL_CRCS if MODVERSIONS
599 This builds a kernel image that retains relocation information
600 so it can be loaded at an arbitrary address.
601 The kernel is linked as a position-independent executable (PIE)
602 and contains dynamic relocations which are processed early in the
604 The relocations make the kernel image about 15% larger (compressed
605 10%), but are discarded at runtime.
607 config RANDOMIZE_BASE
608 bool "Randomize the address of the kernel image (KASLR)"
609 depends on RELOCATABLE
612 In support of Kernel Address Space Layout Randomization (KASLR),
613 this randomizes the address at which the kernel image is loaded,
614 as a security feature that deters exploit attempts relying on
615 knowledge of the location of kernel internals.
621 config ARCH_SPARSEMEM_ENABLE
623 select SPARSEMEM_VMEMMAP_ENABLE
624 select SPARSEMEM_VMEMMAP
626 config ARCH_SPARSEMEM_DEFAULT
629 config ARCH_ENABLE_MEMORY_HOTPLUG
630 def_bool y if SPARSEMEM
632 config ARCH_ENABLE_MEMORY_HOTREMOVE
635 config ARCH_ENABLE_SPLIT_PMD_PTLOCK
638 config MAX_PHYSMEM_BITS
639 int "Maximum size of supported physical memory in bits (42-53)"
643 This option specifies the maximum supported size of physical memory
644 in bits. Supported is any size between 2^42 (4TB) and 2^53 (8PB).
645 Increasing the number of bits also increases the kernel image size.
646 By default 46 bits (64TB) are supported.
650 prompt "Pack kernel stack"
652 This option enables the compiler option -mkernel-backchain if it
653 is available. If the option is available the compiler supports
654 the new stack layout which dramatically reduces the minimum stack
655 frame size. With an old compiler a non-leaf function needs a
656 minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
657 -mkernel-backchain the minimum size drops to 16 byte on 31 bit
658 and 24 byte on 64 bit.
660 Say Y if you are unsure.
664 depends on !VMAP_STACK
665 prompt "Detect kernel stack overflow"
667 This option enables the compiler option -mstack-guard and
668 -mstack-size if they are available. If the compiler supports them
669 it will emit additional code to each function prolog to trigger
670 an illegal operation if the kernel stack is about to overflow.
672 Say N if you are unsure.
675 int "Size of the guard area (128-1024)"
677 depends on CHECK_STACK
680 This allows you to specify the size of the guard area at the lower
681 end of the kernel stack. If the kernel stack points into the guard
682 area on function entry an illegal operation is triggered. The size
683 needs to be a power of 2. Please keep in mind that the size of an
684 interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
685 The minimum size for the stack guard should be 256 for 31 bit and
688 config WARN_DYNAMIC_STACK
690 prompt "Emit compiler warnings for function with dynamic stack usage"
692 This option enables the compiler option -mwarn-dynamicstack. If the
693 compiler supports this options generates warnings for functions
694 that dynamically allocate stack space using alloca.
696 Say N if you are unsure.
704 prompt "QDIO support"
706 This driver provides the Queued Direct I/O base support for
709 To compile this driver as a module, choose M here: the
710 module will be called qdio.
716 config PCI_NR_FUNCTIONS
717 int "Maximum number of PCI functions (1-4096)"
721 This allows you to specify the maximum number of PCI functions which
722 this kernel will support.
731 prompt "Support for CHSC subchannels"
733 This driver allows usage of CHSC subchannels. A CHSC subchannel
734 is usually present on LPAR only.
735 The driver creates a device /dev/chsc, which may be used to
736 obtain I/O configuration information about the machine and
737 to issue asynchronous chsc commands (DANGEROUS).
738 You will usually only want to use this interface on a special
739 LPAR designated for system management.
741 To compile this driver as a module, choose M here: the
742 module will be called chsc_sch.
748 prompt "SCM bus driver"
750 Bus driver for Storage Class Memory.
754 prompt "Support for EADM subchannels"
757 This driver allows usage of EADM subchannels. EADM subchannels act
758 as a communication vehicle for SCM increments.
760 To compile this driver as a module, choose M here: the
761 module will be called eadm_sch.
765 prompt "Support for VFIO-CCW subchannels"
766 depends on S390_CCW_IOMMU && VFIO_MDEV
768 This driver allows usage of I/O subchannels via VFIO-CCW.
770 To compile this driver as a module, choose M here: the
771 module will be called vfio_ccw.
775 prompt "VFIO support for AP devices"
776 depends on S390_AP_IOMMU && VFIO_MDEV_DEVICE && KVM
779 This driver grants access to Adjunct Processor (AP) devices
780 via the VFIO mediated device interface.
782 To compile this driver as a module, choose M here: the module
783 will be called vfio_ap.
790 bool "kernel crash dumps"
793 Generate crash dump after being started by kexec.
794 Crash dump kernels are loaded in the main kernel with kexec-tools
795 into a specially reserved region and then later executed after
796 a crash by kdump/kexec.
797 Refer to <file:Documentation/s390/zfcpdump.rst> for more details on this.
798 This option also enables s390 zfcpdump.
799 See also <file:Documentation/s390/zfcpdump.rst>
808 default (SMC || CCWGROUP)
810 menu "Virtualization"
812 config PROTECTED_VIRTUALIZATION_GUEST
814 prompt "Protected virtualization guest support"
815 select ARCH_HAS_RESTRICTED_VIRTIO_MEMORY_ACCESS
817 Select this option, if you want to be able to run this
818 kernel as a protected virtualization KVM guest.
819 Protected virtualization capable machines have a mini hypervisor
820 located at machine level (an ultravisor). With help of the
821 Ultravisor, KVM will be able to run "protected" VMs, special
822 VMs whose memory and management data are unavailable to KVM.
826 prompt "Pseudo page fault support"
828 Select this option, if you want to use PFAULT pseudo page fault
829 handling under VM. If running native or in LPAR, this option
830 has no effect. If your VM does not support PFAULT, PAGEEX
831 pseudo page fault handling will be used.
832 Note that VM 4.2 supports PFAULT but has a bug in its
833 implementation that causes some problems.
834 Everybody who wants to run Linux under VM != VM4.2 should select
839 prompt "Cooperative memory management"
841 Select this option, if you want to enable the kernel interface
842 to reduce the memory size of the system. This is accomplished
843 by allocating pages of memory and put them "on hold". This only
844 makes sense for a system running under VM where the unused pages
845 will be reused by VM for other guest systems. The interface
846 allows an external monitor to balance memory of many systems.
847 Everybody who wants to run Linux under VM should select this
852 prompt "IUCV special message interface to cooperative memory management"
853 depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
855 Select this option to enable the special message interface to
856 the cooperative memory management.
860 prompt "Linux - VM Monitor Stream, base infrastructure"
863 This provides a kernel interface for creating and updating z/VM APPLDATA
864 monitor records. The monitor records are updated at certain time
865 intervals, once the timer is started.
866 Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
867 i.e. enables or disables monitoring on the Linux side.
868 A custom interval value (in seconds) can be written to
869 /proc/appldata/interval.
871 Defaults are 60 seconds interval and timer off.
872 The /proc entries can also be read from, showing the current settings.
876 prompt "Monitor memory management statistics"
877 depends on APPLDATA_BASE && VM_EVENT_COUNTERS
879 This provides memory management related data to the Linux - VM Monitor
880 Stream, like paging/swapping rate, memory utilisation, etc.
881 Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
882 APPLDATA monitor record, i.e. enables or disables monitoring this record
886 The /proc entry can also be read from, showing the current settings.
888 This can also be compiled as a module, which will be called
893 prompt "Monitor OS statistics"
894 depends on APPLDATA_BASE
896 This provides OS related data to the Linux - VM Monitor Stream, like
897 CPU utilisation, etc.
898 Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
899 APPLDATA monitor record, i.e. enables or disables monitoring this record
903 This can also be compiled as a module, which will be called
906 config APPLDATA_NET_SUM
908 prompt "Monitor overall network statistics"
909 depends on APPLDATA_BASE && NET
911 This provides network related data to the Linux - VM Monitor Stream,
912 currently there is only a total sum of network I/O statistics, no
914 Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
915 APPLDATA monitor record, i.e. enables or disables monitoring this record
919 This can also be compiled as a module, which will be called
924 prompt "s390 hypervisor file system support"
925 select SYS_HYPERVISOR
927 This is a virtual file system intended to provide accounting
928 information in an s390 hypervisor environment.
930 source "arch/s390/kvm/Kconfig"
934 prompt "s390 support for virtio devices"
936 select VIRTUALIZATION
939 Enabling this option adds support for virtio based paravirtual device
942 Select this option if you want to run the kernel as a guest under
949 config S390_UNWIND_SELFTEST
951 prompt "Test unwind functions"
953 This option enables s390 specific stack unwinder testing kernel
954 module. This option is not useful for distributions or general
955 kernels, but only for kernel developers working on architecture code.
957 Say N if you are unsure.