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_ENABLE_MEMORY_HOTPLUG if SPARSEMEM
64 select ARCH_ENABLE_MEMORY_HOTREMOVE
65 select ARCH_ENABLE_SPLIT_PMD_PTLOCK
66 select ARCH_HAS_DEBUG_VM_PGTABLE
67 select ARCH_HAS_DEBUG_WX
68 select ARCH_HAS_DEVMEM_IS_ALLOWED
69 select ARCH_HAS_ELF_RANDOMIZE
70 select ARCH_HAS_FORCE_DMA_UNENCRYPTED
71 select ARCH_HAS_FORTIFY_SOURCE
72 select ARCH_HAS_GCOV_PROFILE_ALL
73 select ARCH_HAS_GIGANTIC_PAGE
75 select ARCH_HAS_MEM_ENCRYPT
76 select ARCH_HAS_PTE_SPECIAL
77 select ARCH_HAS_SCALED_CPUTIME
78 select ARCH_HAS_SET_MEMORY
79 select ARCH_HAS_STRICT_KERNEL_RWX
80 select ARCH_HAS_STRICT_MODULE_RWX
81 select ARCH_HAS_SYSCALL_WRAPPER
82 select ARCH_HAS_UBSAN_SANITIZE_ALL
83 select ARCH_HAS_VDSO_DATA
84 select ARCH_HAVE_NMI_SAFE_CMPXCHG
85 select ARCH_INLINE_READ_LOCK
86 select ARCH_INLINE_READ_LOCK_BH
87 select ARCH_INLINE_READ_LOCK_IRQ
88 select ARCH_INLINE_READ_LOCK_IRQSAVE
89 select ARCH_INLINE_READ_TRYLOCK
90 select ARCH_INLINE_READ_UNLOCK
91 select ARCH_INLINE_READ_UNLOCK_BH
92 select ARCH_INLINE_READ_UNLOCK_IRQ
93 select ARCH_INLINE_READ_UNLOCK_IRQRESTORE
94 select ARCH_INLINE_SPIN_LOCK
95 select ARCH_INLINE_SPIN_LOCK_BH
96 select ARCH_INLINE_SPIN_LOCK_IRQ
97 select ARCH_INLINE_SPIN_LOCK_IRQSAVE
98 select ARCH_INLINE_SPIN_TRYLOCK
99 select ARCH_INLINE_SPIN_TRYLOCK_BH
100 select ARCH_INLINE_SPIN_UNLOCK
101 select ARCH_INLINE_SPIN_UNLOCK_BH
102 select ARCH_INLINE_SPIN_UNLOCK_IRQ
103 select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE
104 select ARCH_INLINE_WRITE_LOCK
105 select ARCH_INLINE_WRITE_LOCK_BH
106 select ARCH_INLINE_WRITE_LOCK_IRQ
107 select ARCH_INLINE_WRITE_LOCK_IRQSAVE
108 select ARCH_INLINE_WRITE_TRYLOCK
109 select ARCH_INLINE_WRITE_UNLOCK
110 select ARCH_INLINE_WRITE_UNLOCK_BH
111 select ARCH_INLINE_WRITE_UNLOCK_IRQ
112 select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE
113 select ARCH_STACKWALK
114 select ARCH_SUPPORTS_ATOMIC_RMW
115 select ARCH_SUPPORTS_DEBUG_PAGEALLOC
116 select ARCH_SUPPORTS_NUMA_BALANCING
117 select ARCH_USE_BUILTIN_BSWAP
118 select ARCH_USE_CMPXCHG_LOCKREF
119 select ARCH_WANTS_DYNAMIC_TASK_STRUCT
120 select ARCH_WANT_DEFAULT_BPF_JIT
121 select ARCH_WANT_IPC_PARSE_VERSION
122 select BUILDTIME_TABLE_SORT
123 select CLONE_BACKWARDS2
124 select CPU_NO_EFFICIENT_FFS if !HAVE_MARCH_Z9_109_FEATURES
125 select DMA_OPS if PCI
126 select DYNAMIC_FTRACE if FUNCTION_TRACER
127 select GENERIC_ALLOCATOR
128 select GENERIC_CPU_AUTOPROBE
129 select GENERIC_CPU_VULNERABILITIES
131 select GENERIC_FIND_FIRST_BIT
132 select GENERIC_GETTIMEOFDAY
133 select GENERIC_PTDUMP
134 select GENERIC_SMP_IDLE_THREAD
135 select GENERIC_TIME_VSYSCALL
136 select GENERIC_VDSO_TIME_NS
137 select HAVE_ALIGNED_STRUCT_PAGE if SLUB
138 select HAVE_ARCH_AUDITSYSCALL
139 select HAVE_ARCH_JUMP_LABEL
140 select HAVE_ARCH_JUMP_LABEL_RELATIVE
141 select HAVE_ARCH_KASAN
142 select HAVE_ARCH_KASAN_VMALLOC
143 select HAVE_ARCH_SECCOMP_FILTER
144 select HAVE_ARCH_SOFT_DIRTY
145 select HAVE_ARCH_TRACEHOOK
146 select HAVE_ARCH_TRANSPARENT_HUGEPAGE
147 select HAVE_ARCH_VMAP_STACK
148 select HAVE_ASM_MODVERSIONS
149 select HAVE_CMPXCHG_DOUBLE
150 select HAVE_CMPXCHG_LOCAL
151 select HAVE_DEBUG_KMEMLEAK
152 select HAVE_DMA_CONTIGUOUS
153 select HAVE_DYNAMIC_FTRACE
154 select HAVE_DYNAMIC_FTRACE_WITH_REGS
155 select HAVE_EBPF_JIT if PACK_STACK && HAVE_MARCH_Z196_FEATURES
156 select HAVE_EFFICIENT_UNALIGNED_ACCESS
159 select HAVE_FTRACE_MCOUNT_RECORD
160 select HAVE_FUNCTION_ERROR_INJECTION
161 select HAVE_FUNCTION_GRAPH_TRACER
162 select HAVE_FUNCTION_TRACER
163 select HAVE_FUTEX_CMPXCHG if FUTEX
164 select HAVE_GCC_PLUGINS
165 select HAVE_GENERIC_VDSO
166 select HAVE_IRQ_EXIT_ON_IRQ_STACK
167 select HAVE_KERNEL_BZIP2
168 select HAVE_KERNEL_GZIP
169 select HAVE_KERNEL_LZ4
170 select HAVE_KERNEL_LZMA
171 select HAVE_KERNEL_LZO
172 select HAVE_KERNEL_UNCOMPRESSED
173 select HAVE_KERNEL_XZ
175 select HAVE_KPROBES_ON_FTRACE
176 select HAVE_KRETPROBES
178 select HAVE_LIVEPATCH
179 select HAVE_MEMBLOCK_PHYS_MAP
180 select HAVE_MOD_ARCH_SPECIFIC
182 select HAVE_NOP_MCOUNT
184 select HAVE_PERF_EVENTS
185 select HAVE_PERF_REGS
186 select HAVE_PERF_USER_STACK_DUMP
187 select HAVE_REGS_AND_STACK_ACCESS_API
188 select HAVE_RELIABLE_STACKTRACE
190 select HAVE_SOFTIRQ_ON_OWN_STACK
191 select HAVE_SYSCALL_TRACEPOINTS
192 select HAVE_VIRT_CPU_ACCOUNTING
193 select HAVE_VIRT_CPU_ACCOUNTING_IDLE
194 select IOMMU_HELPER if PCI
195 select IOMMU_SUPPORT if PCI
196 select MMU_GATHER_NO_GATHER
197 select MMU_GATHER_RCU_TABLE_FREE
198 select MODULES_USE_ELF_RELA
199 select NEED_DMA_MAP_STATE if PCI
200 select NEED_SG_DMA_LENGTH if PCI
202 select OLD_SIGSUSPEND3
203 select PCI_DOMAINS if PCI
204 select PCI_MSI if PCI
205 select PCI_MSI_ARCH_FALLBACKS if PCI_MSI
208 select SYSCTL_EXCEPTION_TRACE
209 select THREAD_INFO_IN_TASK
211 select VIRT_CPU_ACCOUNTING
212 # Note: keep the above list sorted alphabetically
214 config SCHED_OMIT_FRAME_POINTER
217 config PGTABLE_LEVELS
221 source "kernel/livepatch/Kconfig"
223 menu "Processor type and features"
225 config HAVE_MARCH_Z900_FEATURES
228 config HAVE_MARCH_Z990_FEATURES
230 select HAVE_MARCH_Z900_FEATURES
232 config HAVE_MARCH_Z9_109_FEATURES
234 select HAVE_MARCH_Z990_FEATURES
236 config HAVE_MARCH_Z10_FEATURES
238 select HAVE_MARCH_Z9_109_FEATURES
240 config HAVE_MARCH_Z196_FEATURES
242 select HAVE_MARCH_Z10_FEATURES
244 config HAVE_MARCH_ZEC12_FEATURES
246 select HAVE_MARCH_Z196_FEATURES
248 config HAVE_MARCH_Z13_FEATURES
250 select HAVE_MARCH_ZEC12_FEATURES
252 config HAVE_MARCH_Z14_FEATURES
254 select HAVE_MARCH_Z13_FEATURES
256 config HAVE_MARCH_Z15_FEATURES
258 select HAVE_MARCH_Z14_FEATURES
261 prompt "Processor type"
265 bool "IBM zSeries model z800 and z900"
266 select HAVE_MARCH_Z900_FEATURES
267 depends on $(cc-option,-march=z900)
269 Select this to enable optimizations for model z800/z900 (2064 and
270 2066 series). This will enable some optimizations that are not
271 available on older ESA/390 (31 Bit) only CPUs.
274 bool "IBM zSeries model z890 and z990"
275 select HAVE_MARCH_Z990_FEATURES
276 depends on $(cc-option,-march=z990)
278 Select this to enable optimizations for model z890/z990 (2084 and
279 2086 series). The kernel will be slightly faster but will not work
284 select HAVE_MARCH_Z9_109_FEATURES
285 depends on $(cc-option,-march=z9-109)
287 Select this to enable optimizations for IBM System z9 (2094 and
288 2096 series). The kernel will be slightly faster but will not work
292 bool "IBM System z10"
293 select HAVE_MARCH_Z10_FEATURES
294 depends on $(cc-option,-march=z10)
296 Select this to enable optimizations for IBM System z10 (2097 and
297 2098 series). The kernel will be slightly faster but will not work
301 bool "IBM zEnterprise 114 and 196"
302 select HAVE_MARCH_Z196_FEATURES
303 depends on $(cc-option,-march=z196)
305 Select this to enable optimizations for IBM zEnterprise 114 and 196
306 (2818 and 2817 series). The kernel will be slightly faster but will
307 not work on older machines.
310 bool "IBM zBC12 and zEC12"
311 select HAVE_MARCH_ZEC12_FEATURES
312 depends on $(cc-option,-march=zEC12)
314 Select this to enable optimizations for IBM zBC12 and zEC12 (2828 and
315 2827 series). The kernel will be slightly faster but will not work on
319 bool "IBM z13s and z13"
320 select HAVE_MARCH_Z13_FEATURES
321 depends on $(cc-option,-march=z13)
323 Select this to enable optimizations for IBM z13s and z13 (2965 and
324 2964 series). The kernel will be slightly faster but will not work on
328 bool "IBM z14 ZR1 and z14"
329 select HAVE_MARCH_Z14_FEATURES
330 depends on $(cc-option,-march=z14)
332 Select this to enable optimizations for IBM z14 ZR1 and z14 (3907
333 and 3906 series). The kernel will be slightly faster but will not
334 work on older machines.
338 select HAVE_MARCH_Z15_FEATURES
339 depends on $(cc-option,-march=z15)
341 Select this to enable optimizations for IBM z15 (8562
342 and 8561 series). The kernel will be slightly faster but will not
343 work on older machines.
347 config MARCH_Z900_TUNE
348 def_bool TUNE_Z900 || MARCH_Z900 && TUNE_DEFAULT
350 config MARCH_Z990_TUNE
351 def_bool TUNE_Z990 || MARCH_Z990 && TUNE_DEFAULT
353 config MARCH_Z9_109_TUNE
354 def_bool TUNE_Z9_109 || MARCH_Z9_109 && TUNE_DEFAULT
356 config MARCH_Z10_TUNE
357 def_bool TUNE_Z10 || MARCH_Z10 && TUNE_DEFAULT
359 config MARCH_Z196_TUNE
360 def_bool TUNE_Z196 || MARCH_Z196 && TUNE_DEFAULT
362 config MARCH_ZEC12_TUNE
363 def_bool TUNE_ZEC12 || MARCH_ZEC12 && TUNE_DEFAULT
365 config MARCH_Z13_TUNE
366 def_bool TUNE_Z13 || MARCH_Z13 && TUNE_DEFAULT
368 config MARCH_Z14_TUNE
369 def_bool TUNE_Z14 || MARCH_Z14 && TUNE_DEFAULT
371 config MARCH_Z15_TUNE
372 def_bool TUNE_Z15 || MARCH_Z15 && TUNE_DEFAULT
375 prompt "Tune code generation"
378 Cause the compiler to tune (-mtune) the generated code for a machine.
379 This will make the code run faster on the selected machine but
380 somewhat slower on other machines.
381 This option only changes how the compiler emits instructions, not the
382 selection of instructions itself, so the resulting kernel will run on
388 Tune the generated code for the target processor for which the kernel
392 bool "IBM zSeries model z800 and z900"
393 depends on $(cc-option,-mtune=z900)
396 bool "IBM zSeries model z890 and z990"
397 depends on $(cc-option,-mtune=z990)
401 depends on $(cc-option,-mtune=z9-109)
404 bool "IBM System z10"
405 depends on $(cc-option,-mtune=z10)
408 bool "IBM zEnterprise 114 and 196"
409 depends on $(cc-option,-mtune=z196)
412 bool "IBM zBC12 and zEC12"
413 depends on $(cc-option,-mtune=zEC12)
416 bool "IBM z13s and z13"
417 depends on $(cc-option,-mtune=z13)
420 bool "IBM z14 ZR1 and z14"
421 depends on $(cc-option,-mtune=z14)
425 depends on $(cc-option,-mtune=z15)
434 prompt "Kernel support for 31 bit emulation"
435 select ARCH_WANT_OLD_COMPAT_IPC
436 select COMPAT_OLD_SIGACTION
440 Select this option if you want to enable your system kernel to
441 handle system-calls from ELF binaries for 31 bit ESA. This option
442 (and some other stuff like libraries and such) is needed for
443 executing 31 bit applications. It is safe to say "Y".
445 config SYSVIPC_COMPAT
446 def_bool y if COMPAT && SYSVIPC
452 int "Maximum number of CPUs (2-512)"
456 This allows you to specify the maximum number of CPUs which this
457 kernel will support. The maximum supported value is 512 and the
458 minimum value which makes sense is 2.
460 This is purely to save memory - each supported CPU adds
461 approximately sixteen kilobytes to the kernel image.
468 depends on SCHED_TOPOLOGY
473 This option adds NUMA support to the kernel.
477 depends on NEED_MULTIPLE_NODES
492 config SCHED_TOPOLOGY
494 prompt "Topology scheduler support"
500 Topology scheduler support improves the CPU scheduler's decision
501 making when dealing with machines that have multi-threading,
502 multiple cores or multiple books.
504 source "kernel/Kconfig.hz"
511 bool "kexec file based system call"
515 depends on CRYPTO_SHA256
516 depends on CRYPTO_SHA256_S390
518 Enable the kexec file based system call. In contrast to the normal
519 kexec system call this system call takes file descriptors for the
520 kernel and initramfs as arguments.
522 config ARCH_HAS_KEXEC_PURGATORY
524 depends on KEXEC_FILE
527 bool "Verify kernel signature during kexec_file_load() syscall"
528 depends on KEXEC_FILE && MODULE_SIG_FORMAT
530 This option makes kernel signature verification mandatory for
531 the kexec_file_load() syscall.
533 In addition to that option, you need to enable signature
534 verification for the corresponding kernel image type being
535 loaded in order for this to work.
539 prompt "s390 architectural random number generation API"
541 Enable the s390 architectural random number generation API
542 to provide random data for all consumers within the Linux
545 When enabled the arch_random_* functions declared in linux/random.h
546 are implemented. The implementation is based on the s390 CPACF
547 instruction subfunction TRNG which provides a real true random
554 prompt "Enable modified branch prediction for the kernel by default"
556 If this option is selected the kernel will switch to a modified
557 branch prediction mode if the firmware interface is available.
558 The modified branch prediction mode improves the behaviour in
559 regard to speculative execution.
561 With the option enabled the kernel parameter "nobp=0" or "nospec"
562 can be used to run the kernel in the normal branch prediction mode.
564 With the option disabled the modified branch prediction mode is
565 enabled with the "nobp=1" kernel parameter.
571 prompt "Avoid speculative indirect branches in the kernel"
573 Compile the kernel with the expoline compiler options to guard
574 against kernel-to-user data leaks by avoiding speculative indirect
576 Requires a compiler with -mindirect-branch=thunk support for full
577 protection. The kernel may run slower.
582 prompt "Expoline default"
584 default EXPOLINE_FULL
587 bool "spectre_v2=off"
590 bool "spectre_v2=auto"
598 bool "Build a relocatable kernel"
599 select MODULE_REL_CRCS if MODVERSIONS
602 This builds a kernel image that retains relocation information
603 so it can be loaded at an arbitrary address.
604 The kernel is linked as a position-independent executable (PIE)
605 and contains dynamic relocations which are processed early in the
607 The relocations make the kernel image about 15% larger (compressed
608 10%), but are discarded at runtime.
610 config RANDOMIZE_BASE
611 bool "Randomize the address of the kernel image (KASLR)"
612 depends on RELOCATABLE
615 In support of Kernel Address Space Layout Randomization (KASLR),
616 this randomizes the address at which the kernel image is loaded,
617 as a security feature that deters exploit attempts relying on
618 knowledge of the location of kernel internals.
624 config ARCH_SPARSEMEM_ENABLE
626 select SPARSEMEM_VMEMMAP_ENABLE
627 select SPARSEMEM_VMEMMAP
629 config ARCH_SPARSEMEM_DEFAULT
632 config MAX_PHYSMEM_BITS
633 int "Maximum size of supported physical memory in bits (42-53)"
637 This option specifies the maximum supported size of physical memory
638 in bits. Supported is any size between 2^42 (4TB) and 2^53 (8PB).
639 Increasing the number of bits also increases the kernel image size.
640 By default 46 bits (64TB) are supported.
644 prompt "Pack kernel stack"
646 This option enables the compiler option -mkernel-backchain if it
647 is available. If the option is available the compiler supports
648 the new stack layout which dramatically reduces the minimum stack
649 frame size. With an old compiler a non-leaf function needs a
650 minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
651 -mkernel-backchain the minimum size drops to 16 byte on 31 bit
652 and 24 byte on 64 bit.
654 Say Y if you are unsure.
658 depends on !VMAP_STACK
659 prompt "Detect kernel stack overflow"
661 This option enables the compiler option -mstack-guard and
662 -mstack-size if they are available. If the compiler supports them
663 it will emit additional code to each function prolog to trigger
664 an illegal operation if the kernel stack is about to overflow.
666 Say N if you are unsure.
669 int "Size of the guard area (128-1024)"
671 depends on CHECK_STACK
674 This allows you to specify the size of the guard area at the lower
675 end of the kernel stack. If the kernel stack points into the guard
676 area on function entry an illegal operation is triggered. The size
677 needs to be a power of 2. Please keep in mind that the size of an
678 interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
679 The minimum size for the stack guard should be 256 for 31 bit and
682 config WARN_DYNAMIC_STACK
684 prompt "Emit compiler warnings for function with dynamic stack usage"
686 This option enables the compiler option -mwarn-dynamicstack. If the
687 compiler supports this options generates warnings for functions
688 that dynamically allocate stack space using alloca.
690 Say N if you are unsure.
698 prompt "QDIO support"
700 This driver provides the Queued Direct I/O base support for
703 To compile this driver as a module, choose M here: the
704 module will be called qdio.
710 config PCI_NR_FUNCTIONS
711 int "Maximum number of PCI functions (1-4096)"
715 This allows you to specify the maximum number of PCI functions which
716 this kernel will support.
725 prompt "Support for CHSC subchannels"
727 This driver allows usage of CHSC subchannels. A CHSC subchannel
728 is usually present on LPAR only.
729 The driver creates a device /dev/chsc, which may be used to
730 obtain I/O configuration information about the machine and
731 to issue asynchronous chsc commands (DANGEROUS).
732 You will usually only want to use this interface on a special
733 LPAR designated for system management.
735 To compile this driver as a module, choose M here: the
736 module will be called chsc_sch.
742 prompt "SCM bus driver"
744 Bus driver for Storage Class Memory.
748 prompt "Support for EADM subchannels"
751 This driver allows usage of EADM subchannels. EADM subchannels act
752 as a communication vehicle for SCM increments.
754 To compile this driver as a module, choose M here: the
755 module will be called eadm_sch.
759 prompt "Support for VFIO-CCW subchannels"
760 depends on S390_CCW_IOMMU && VFIO_MDEV
762 This driver allows usage of I/O subchannels via VFIO-CCW.
764 To compile this driver as a module, choose M here: the
765 module will be called vfio_ccw.
769 prompt "VFIO support for AP devices"
770 depends on S390_AP_IOMMU && VFIO_MDEV_DEVICE && KVM
773 This driver grants access to Adjunct Processor (AP) devices
774 via the VFIO mediated device interface.
776 To compile this driver as a module, choose M here: the module
777 will be called vfio_ap.
784 bool "kernel crash dumps"
787 Generate crash dump after being started by kexec.
788 Crash dump kernels are loaded in the main kernel with kexec-tools
789 into a specially reserved region and then later executed after
790 a crash by kdump/kexec.
791 Refer to <file:Documentation/s390/zfcpdump.rst> for more details on this.
792 This option also enables s390 zfcpdump.
793 See also <file:Documentation/s390/zfcpdump.rst>
802 default (SMC || CCWGROUP)
804 menu "Virtualization"
806 config PROTECTED_VIRTUALIZATION_GUEST
808 prompt "Protected virtualization guest support"
809 select ARCH_HAS_RESTRICTED_VIRTIO_MEMORY_ACCESS
811 Select this option, if you want to be able to run this
812 kernel as a protected virtualization KVM guest.
813 Protected virtualization capable machines have a mini hypervisor
814 located at machine level (an ultravisor). With help of the
815 Ultravisor, KVM will be able to run "protected" VMs, special
816 VMs whose memory and management data are unavailable to KVM.
820 prompt "Pseudo page fault support"
822 Select this option, if you want to use PFAULT pseudo page fault
823 handling under VM. If running native or in LPAR, this option
824 has no effect. If your VM does not support PFAULT, PAGEEX
825 pseudo page fault handling will be used.
826 Note that VM 4.2 supports PFAULT but has a bug in its
827 implementation that causes some problems.
828 Everybody who wants to run Linux under VM != VM4.2 should select
833 prompt "Cooperative memory management"
835 Select this option, if you want to enable the kernel interface
836 to reduce the memory size of the system. This is accomplished
837 by allocating pages of memory and put them "on hold". This only
838 makes sense for a system running under VM where the unused pages
839 will be reused by VM for other guest systems. The interface
840 allows an external monitor to balance memory of many systems.
841 Everybody who wants to run Linux under VM should select this
846 prompt "IUCV special message interface to cooperative memory management"
847 depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
849 Select this option to enable the special message interface to
850 the cooperative memory management.
854 prompt "Linux - VM Monitor Stream, base infrastructure"
857 This provides a kernel interface for creating and updating z/VM APPLDATA
858 monitor records. The monitor records are updated at certain time
859 intervals, once the timer is started.
860 Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
861 i.e. enables or disables monitoring on the Linux side.
862 A custom interval value (in seconds) can be written to
863 /proc/appldata/interval.
865 Defaults are 60 seconds interval and timer off.
866 The /proc entries can also be read from, showing the current settings.
870 prompt "Monitor memory management statistics"
871 depends on APPLDATA_BASE && VM_EVENT_COUNTERS
873 This provides memory management related data to the Linux - VM Monitor
874 Stream, like paging/swapping rate, memory utilisation, etc.
875 Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
876 APPLDATA monitor record, i.e. enables or disables monitoring this record
880 The /proc entry can also be read from, showing the current settings.
882 This can also be compiled as a module, which will be called
887 prompt "Monitor OS statistics"
888 depends on APPLDATA_BASE
890 This provides OS related data to the Linux - VM Monitor Stream, like
891 CPU utilisation, etc.
892 Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
893 APPLDATA monitor record, i.e. enables or disables monitoring this record
897 This can also be compiled as a module, which will be called
900 config APPLDATA_NET_SUM
902 prompt "Monitor overall network statistics"
903 depends on APPLDATA_BASE && NET
905 This provides network related data to the Linux - VM Monitor Stream,
906 currently there is only a total sum of network I/O statistics, no
908 Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
909 APPLDATA monitor record, i.e. enables or disables monitoring this record
913 This can also be compiled as a module, which will be called
918 prompt "s390 hypervisor file system support"
919 select SYS_HYPERVISOR
921 This is a virtual file system intended to provide accounting
922 information in an s390 hypervisor environment.
924 source "arch/s390/kvm/Kconfig"
928 prompt "s390 support for virtio devices"
930 select VIRTUALIZATION
933 Enabling this option adds support for virtio based paravirtual device
936 Select this option if you want to run the kernel as a guest under
943 config S390_UNWIND_SELFTEST
945 prompt "Test unwind functions"
947 This option enables s390 specific stack unwinder testing kernel
948 module. This option is not useful for distributions or general
949 kernels, but only for kernel developers working on architecture code.
951 Say N if you are unsure.