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_RANDOMIZE_KSTACK_OFFSET
144 select HAVE_ARCH_SECCOMP_FILTER
145 select HAVE_ARCH_SOFT_DIRTY
146 select HAVE_ARCH_TRACEHOOK
147 select HAVE_ARCH_TRANSPARENT_HUGEPAGE
148 select HAVE_ARCH_VMAP_STACK
149 select HAVE_ASM_MODVERSIONS
150 select HAVE_CMPXCHG_DOUBLE
151 select HAVE_CMPXCHG_LOCAL
152 select HAVE_DEBUG_KMEMLEAK
153 select HAVE_DMA_CONTIGUOUS
154 select HAVE_DYNAMIC_FTRACE
155 select HAVE_DYNAMIC_FTRACE_WITH_REGS
156 select HAVE_EBPF_JIT if PACK_STACK && HAVE_MARCH_Z196_FEATURES
157 select HAVE_EFFICIENT_UNALIGNED_ACCESS
160 select HAVE_FTRACE_MCOUNT_RECORD
161 select HAVE_FUNCTION_ERROR_INJECTION
162 select HAVE_FUNCTION_GRAPH_TRACER
163 select HAVE_FUNCTION_TRACER
164 select HAVE_FUTEX_CMPXCHG if FUTEX
165 select HAVE_GCC_PLUGINS
166 select HAVE_GENERIC_VDSO
167 select HAVE_IOREMAP_PROT if PCI
168 select HAVE_KERNEL_BZIP2
169 select HAVE_KERNEL_GZIP
170 select HAVE_KERNEL_LZ4
171 select HAVE_KERNEL_LZMA
172 select HAVE_KERNEL_LZO
173 select HAVE_KERNEL_UNCOMPRESSED
174 select HAVE_KERNEL_XZ
176 select HAVE_KPROBES_ON_FTRACE
177 select HAVE_KRETPROBES
179 select HAVE_LIVEPATCH
180 select HAVE_MEMBLOCK_PHYS_MAP
181 select HAVE_MOD_ARCH_SPECIFIC
183 select HAVE_NOP_MCOUNT
185 select HAVE_PERF_EVENTS
186 select HAVE_PERF_REGS
187 select HAVE_PERF_USER_STACK_DUMP
188 select HAVE_REGS_AND_STACK_ACCESS_API
189 select HAVE_RELIABLE_STACKTRACE
191 select HAVE_SOFTIRQ_ON_OWN_STACK
192 select HAVE_SYSCALL_TRACEPOINTS
193 select HAVE_VIRT_CPU_ACCOUNTING
194 select HAVE_VIRT_CPU_ACCOUNTING_IDLE
195 select IOMMU_HELPER if PCI
196 select IOMMU_SUPPORT if PCI
197 select MMU_GATHER_NO_GATHER
198 select MMU_GATHER_RCU_TABLE_FREE
199 select MODULES_USE_ELF_RELA
200 select NEED_DMA_MAP_STATE if PCI
201 select NEED_SG_DMA_LENGTH if PCI
203 select OLD_SIGSUSPEND3
204 select PCI_DOMAINS if PCI
205 select PCI_MSI if PCI
206 select PCI_MSI_ARCH_FALLBACKS if PCI_MSI
209 select SYSCTL_EXCEPTION_TRACE
210 select THREAD_INFO_IN_TASK
212 select VIRT_CPU_ACCOUNTING
213 # Note: keep the above list sorted alphabetically
215 config SCHED_OMIT_FRAME_POINTER
218 config PGTABLE_LEVELS
222 source "kernel/livepatch/Kconfig"
224 menu "Processor type and features"
226 config HAVE_MARCH_Z900_FEATURES
229 config HAVE_MARCH_Z990_FEATURES
231 select HAVE_MARCH_Z900_FEATURES
233 config HAVE_MARCH_Z9_109_FEATURES
235 select HAVE_MARCH_Z990_FEATURES
237 config HAVE_MARCH_Z10_FEATURES
239 select HAVE_MARCH_Z9_109_FEATURES
241 config HAVE_MARCH_Z196_FEATURES
243 select HAVE_MARCH_Z10_FEATURES
245 config HAVE_MARCH_ZEC12_FEATURES
247 select HAVE_MARCH_Z196_FEATURES
249 config HAVE_MARCH_Z13_FEATURES
251 select HAVE_MARCH_ZEC12_FEATURES
253 config HAVE_MARCH_Z14_FEATURES
255 select HAVE_MARCH_Z13_FEATURES
257 config HAVE_MARCH_Z15_FEATURES
259 select HAVE_MARCH_Z14_FEATURES
262 prompt "Processor type"
266 bool "IBM zSeries model z800 and z900"
267 select HAVE_MARCH_Z900_FEATURES
268 depends on $(cc-option,-march=z900)
270 Select this to enable optimizations for model z800/z900 (2064 and
271 2066 series). This will enable some optimizations that are not
272 available on older ESA/390 (31 Bit) only CPUs.
275 bool "IBM zSeries model z890 and z990"
276 select HAVE_MARCH_Z990_FEATURES
277 depends on $(cc-option,-march=z990)
279 Select this to enable optimizations for model z890/z990 (2084 and
280 2086 series). The kernel will be slightly faster but will not work
285 select HAVE_MARCH_Z9_109_FEATURES
286 depends on $(cc-option,-march=z9-109)
288 Select this to enable optimizations for IBM System z9 (2094 and
289 2096 series). The kernel will be slightly faster but will not work
293 bool "IBM System z10"
294 select HAVE_MARCH_Z10_FEATURES
295 depends on $(cc-option,-march=z10)
297 Select this to enable optimizations for IBM System z10 (2097 and
298 2098 series). The kernel will be slightly faster but will not work
302 bool "IBM zEnterprise 114 and 196"
303 select HAVE_MARCH_Z196_FEATURES
304 depends on $(cc-option,-march=z196)
306 Select this to enable optimizations for IBM zEnterprise 114 and 196
307 (2818 and 2817 series). The kernel will be slightly faster but will
308 not work on older machines.
311 bool "IBM zBC12 and zEC12"
312 select HAVE_MARCH_ZEC12_FEATURES
313 depends on $(cc-option,-march=zEC12)
315 Select this to enable optimizations for IBM zBC12 and zEC12 (2828 and
316 2827 series). The kernel will be slightly faster but will not work on
320 bool "IBM z13s and z13"
321 select HAVE_MARCH_Z13_FEATURES
322 depends on $(cc-option,-march=z13)
324 Select this to enable optimizations for IBM z13s and z13 (2965 and
325 2964 series). The kernel will be slightly faster but will not work on
329 bool "IBM z14 ZR1 and z14"
330 select HAVE_MARCH_Z14_FEATURES
331 depends on $(cc-option,-march=z14)
333 Select this to enable optimizations for IBM z14 ZR1 and z14 (3907
334 and 3906 series). The kernel will be slightly faster but will not
335 work on older machines.
339 select HAVE_MARCH_Z15_FEATURES
340 depends on $(cc-option,-march=z15)
342 Select this to enable optimizations for IBM z15 (8562
343 and 8561 series). The kernel will be slightly faster but will not
344 work on older machines.
348 config MARCH_Z900_TUNE
349 def_bool TUNE_Z900 || MARCH_Z900 && TUNE_DEFAULT
351 config MARCH_Z990_TUNE
352 def_bool TUNE_Z990 || MARCH_Z990 && TUNE_DEFAULT
354 config MARCH_Z9_109_TUNE
355 def_bool TUNE_Z9_109 || MARCH_Z9_109 && TUNE_DEFAULT
357 config MARCH_Z10_TUNE
358 def_bool TUNE_Z10 || MARCH_Z10 && TUNE_DEFAULT
360 config MARCH_Z196_TUNE
361 def_bool TUNE_Z196 || MARCH_Z196 && TUNE_DEFAULT
363 config MARCH_ZEC12_TUNE
364 def_bool TUNE_ZEC12 || MARCH_ZEC12 && TUNE_DEFAULT
366 config MARCH_Z13_TUNE
367 def_bool TUNE_Z13 || MARCH_Z13 && TUNE_DEFAULT
369 config MARCH_Z14_TUNE
370 def_bool TUNE_Z14 || MARCH_Z14 && TUNE_DEFAULT
372 config MARCH_Z15_TUNE
373 def_bool TUNE_Z15 || MARCH_Z15 && TUNE_DEFAULT
376 prompt "Tune code generation"
379 Cause the compiler to tune (-mtune) the generated code for a machine.
380 This will make the code run faster on the selected machine but
381 somewhat slower on other machines.
382 This option only changes how the compiler emits instructions, not the
383 selection of instructions itself, so the resulting kernel will run on
389 Tune the generated code for the target processor for which the kernel
393 bool "IBM zSeries model z800 and z900"
394 depends on $(cc-option,-mtune=z900)
397 bool "IBM zSeries model z890 and z990"
398 depends on $(cc-option,-mtune=z990)
402 depends on $(cc-option,-mtune=z9-109)
405 bool "IBM System z10"
406 depends on $(cc-option,-mtune=z10)
409 bool "IBM zEnterprise 114 and 196"
410 depends on $(cc-option,-mtune=z196)
413 bool "IBM zBC12 and zEC12"
414 depends on $(cc-option,-mtune=zEC12)
417 bool "IBM z13s and z13"
418 depends on $(cc-option,-mtune=z13)
421 bool "IBM z14 ZR1 and z14"
422 depends on $(cc-option,-mtune=z14)
426 depends on $(cc-option,-mtune=z15)
435 prompt "Kernel support for 31 bit emulation"
436 select ARCH_WANT_OLD_COMPAT_IPC
437 select COMPAT_OLD_SIGACTION
441 Select this option if you want to enable your system kernel to
442 handle system-calls from ELF binaries for 31 bit ESA. This option
443 (and some other stuff like libraries and such) is needed for
444 executing 31 bit applications. It is safe to say "Y".
446 config SYSVIPC_COMPAT
447 def_bool y if COMPAT && SYSVIPC
453 int "Maximum number of CPUs (2-512)"
457 This allows you to specify the maximum number of CPUs which this
458 kernel will support. The maximum supported value is 512 and the
459 minimum value which makes sense is 2.
461 This is purely to save memory - each supported CPU adds
462 approximately sixteen kilobytes to the kernel image.
469 depends on SCHED_TOPOLOGY
474 This option adds NUMA support to the kernel.
478 depends on NEED_MULTIPLE_NODES
493 config SCHED_TOPOLOGY
495 prompt "Topology scheduler support"
501 Topology scheduler support improves the CPU scheduler's decision
502 making when dealing with machines that have multi-threading,
503 multiple cores or multiple books.
505 source "kernel/Kconfig.hz"
512 bool "kexec file based system call"
516 depends on CRYPTO_SHA256
517 depends on CRYPTO_SHA256_S390
519 Enable the kexec file based system call. In contrast to the normal
520 kexec system call this system call takes file descriptors for the
521 kernel and initramfs as arguments.
523 config ARCH_HAS_KEXEC_PURGATORY
525 depends on KEXEC_FILE
528 bool "Verify kernel signature during kexec_file_load() syscall"
529 depends on KEXEC_FILE && MODULE_SIG_FORMAT
531 This option makes kernel signature verification mandatory for
532 the kexec_file_load() syscall.
534 In addition to that option, you need to enable signature
535 verification for the corresponding kernel image type being
536 loaded in order for this to work.
540 prompt "s390 architectural random number generation API"
542 Enable the s390 architectural random number generation API
543 to provide random data for all consumers within the Linux
546 When enabled the arch_random_* functions declared in linux/random.h
547 are implemented. The implementation is based on the s390 CPACF
548 instruction subfunction TRNG which provides a real true random
555 prompt "Enable modified branch prediction for the kernel by default"
557 If this option is selected the kernel will switch to a modified
558 branch prediction mode if the firmware interface is available.
559 The modified branch prediction mode improves the behaviour in
560 regard to speculative execution.
562 With the option enabled the kernel parameter "nobp=0" or "nospec"
563 can be used to run the kernel in the normal branch prediction mode.
565 With the option disabled the modified branch prediction mode is
566 enabled with the "nobp=1" kernel parameter.
572 prompt "Avoid speculative indirect branches in the kernel"
574 Compile the kernel with the expoline compiler options to guard
575 against kernel-to-user data leaks by avoiding speculative indirect
577 Requires a compiler with -mindirect-branch=thunk support for full
578 protection. The kernel may run slower.
583 prompt "Expoline default"
585 default EXPOLINE_FULL
588 bool "spectre_v2=off"
591 bool "spectre_v2=auto"
599 bool "Build a relocatable kernel"
600 select MODULE_REL_CRCS if MODVERSIONS
603 This builds a kernel image that retains relocation information
604 so it can be loaded at an arbitrary address.
605 The kernel is linked as a position-independent executable (PIE)
606 and contains dynamic relocations which are processed early in the
608 The relocations make the kernel image about 15% larger (compressed
609 10%), but are discarded at runtime.
611 config RANDOMIZE_BASE
612 bool "Randomize the address of the kernel image (KASLR)"
613 depends on RELOCATABLE
616 In support of Kernel Address Space Layout Randomization (KASLR),
617 this randomizes the address at which the kernel image is loaded,
618 as a security feature that deters exploit attempts relying on
619 knowledge of the location of kernel internals.
625 config ARCH_SPARSEMEM_ENABLE
627 select SPARSEMEM_VMEMMAP_ENABLE
628 select SPARSEMEM_VMEMMAP
630 config ARCH_SPARSEMEM_DEFAULT
633 config MAX_PHYSMEM_BITS
634 int "Maximum size of supported physical memory in bits (42-53)"
638 This option specifies the maximum supported size of physical memory
639 in bits. Supported is any size between 2^42 (4TB) and 2^53 (8PB).
640 Increasing the number of bits also increases the kernel image size.
641 By default 46 bits (64TB) are supported.
645 prompt "Pack kernel stack"
647 This option enables the compiler option -mkernel-backchain if it
648 is available. If the option is available the compiler supports
649 the new stack layout which dramatically reduces the minimum stack
650 frame size. With an old compiler a non-leaf function needs a
651 minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
652 -mkernel-backchain the minimum size drops to 16 byte on 31 bit
653 and 24 byte on 64 bit.
655 Say Y if you are unsure.
659 depends on !VMAP_STACK
660 prompt "Detect kernel stack overflow"
662 This option enables the compiler option -mstack-guard and
663 -mstack-size if they are available. If the compiler supports them
664 it will emit additional code to each function prolog to trigger
665 an illegal operation if the kernel stack is about to overflow.
667 Say N if you are unsure.
670 int "Size of the guard area (128-1024)"
672 depends on CHECK_STACK
675 This allows you to specify the size of the guard area at the lower
676 end of the kernel stack. If the kernel stack points into the guard
677 area on function entry an illegal operation is triggered. The size
678 needs to be a power of 2. Please keep in mind that the size of an
679 interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
680 The minimum size for the stack guard should be 256 for 31 bit and
683 config WARN_DYNAMIC_STACK
685 prompt "Emit compiler warnings for function with dynamic stack usage"
687 This option enables the compiler option -mwarn-dynamicstack. If the
688 compiler supports this options generates warnings for functions
689 that dynamically allocate stack space using alloca.
691 Say N if you are unsure.
699 prompt "QDIO support"
701 This driver provides the Queued Direct I/O base support for
704 To compile this driver as a module, choose M here: the
705 module will be called qdio.
711 config PCI_NR_FUNCTIONS
712 int "Maximum number of PCI functions (1-4096)"
716 This allows you to specify the maximum number of PCI functions which
717 this kernel will support.
726 prompt "Support for CHSC subchannels"
728 This driver allows usage of CHSC subchannels. A CHSC subchannel
729 is usually present on LPAR only.
730 The driver creates a device /dev/chsc, which may be used to
731 obtain I/O configuration information about the machine and
732 to issue asynchronous chsc commands (DANGEROUS).
733 You will usually only want to use this interface on a special
734 LPAR designated for system management.
736 To compile this driver as a module, choose M here: the
737 module will be called chsc_sch.
743 prompt "SCM bus driver"
745 Bus driver for Storage Class Memory.
749 prompt "Support for EADM subchannels"
752 This driver allows usage of EADM subchannels. EADM subchannels act
753 as a communication vehicle for SCM increments.
755 To compile this driver as a module, choose M here: the
756 module will be called eadm_sch.
760 prompt "Support for VFIO-CCW subchannels"
761 depends on S390_CCW_IOMMU && VFIO_MDEV
763 This driver allows usage of I/O subchannels via VFIO-CCW.
765 To compile this driver as a module, choose M here: the
766 module will be called vfio_ccw.
770 prompt "VFIO support for AP devices"
771 depends on S390_AP_IOMMU && VFIO_MDEV_DEVICE && KVM
774 This driver grants access to Adjunct Processor (AP) devices
775 via the VFIO mediated device interface.
777 To compile this driver as a module, choose M here: the module
778 will be called vfio_ap.
785 bool "kernel crash dumps"
788 Generate crash dump after being started by kexec.
789 Crash dump kernels are loaded in the main kernel with kexec-tools
790 into a specially reserved region and then later executed after
791 a crash by kdump/kexec.
792 Refer to <file:Documentation/s390/zfcpdump.rst> for more details on this.
793 This option also enables s390 zfcpdump.
794 See also <file:Documentation/s390/zfcpdump.rst>
803 default (SMC || CCWGROUP)
805 menu "Virtualization"
807 config PROTECTED_VIRTUALIZATION_GUEST
809 prompt "Protected virtualization guest support"
810 select ARCH_HAS_RESTRICTED_VIRTIO_MEMORY_ACCESS
812 Select this option, if you want to be able to run this
813 kernel as a protected virtualization KVM guest.
814 Protected virtualization capable machines have a mini hypervisor
815 located at machine level (an ultravisor). With help of the
816 Ultravisor, KVM will be able to run "protected" VMs, special
817 VMs whose memory and management data are unavailable to KVM.
821 prompt "Pseudo page fault support"
823 Select this option, if you want to use PFAULT pseudo page fault
824 handling under VM. If running native or in LPAR, this option
825 has no effect. If your VM does not support PFAULT, PAGEEX
826 pseudo page fault handling will be used.
827 Note that VM 4.2 supports PFAULT but has a bug in its
828 implementation that causes some problems.
829 Everybody who wants to run Linux under VM != VM4.2 should select
834 prompt "Cooperative memory management"
836 Select this option, if you want to enable the kernel interface
837 to reduce the memory size of the system. This is accomplished
838 by allocating pages of memory and put them "on hold". This only
839 makes sense for a system running under VM where the unused pages
840 will be reused by VM for other guest systems. The interface
841 allows an external monitor to balance memory of many systems.
842 Everybody who wants to run Linux under VM should select this
847 prompt "IUCV special message interface to cooperative memory management"
848 depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
850 Select this option to enable the special message interface to
851 the cooperative memory management.
855 prompt "Linux - VM Monitor Stream, base infrastructure"
856 depends on PROC_SYSCTL
858 This provides a kernel interface for creating and updating z/VM APPLDATA
859 monitor records. The monitor records are updated at certain time
860 intervals, once the timer is started.
861 Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
862 i.e. enables or disables monitoring on the Linux side.
863 A custom interval value (in seconds) can be written to
864 /proc/appldata/interval.
866 Defaults are 60 seconds interval and timer off.
867 The /proc entries can also be read from, showing the current settings.
871 prompt "Monitor memory management statistics"
872 depends on APPLDATA_BASE && VM_EVENT_COUNTERS
874 This provides memory management related data to the Linux - VM Monitor
875 Stream, like paging/swapping rate, memory utilisation, etc.
876 Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
877 APPLDATA monitor record, i.e. enables or disables monitoring this record
881 The /proc entry can also be read from, showing the current settings.
883 This can also be compiled as a module, which will be called
888 prompt "Monitor OS statistics"
889 depends on APPLDATA_BASE
891 This provides OS related data to the Linux - VM Monitor Stream, like
892 CPU utilisation, etc.
893 Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
894 APPLDATA monitor record, i.e. enables or disables monitoring this record
898 This can also be compiled as a module, which will be called
901 config APPLDATA_NET_SUM
903 prompt "Monitor overall network statistics"
904 depends on APPLDATA_BASE && NET
906 This provides network related data to the Linux - VM Monitor Stream,
907 currently there is only a total sum of network I/O statistics, no
909 Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
910 APPLDATA monitor record, i.e. enables or disables monitoring this record
914 This can also be compiled as a module, which will be called
919 prompt "s390 hypervisor file system support"
920 select SYS_HYPERVISOR
922 This is a virtual file system intended to provide accounting
923 information in an s390 hypervisor environment.
925 source "arch/s390/kvm/Kconfig"
929 prompt "s390 support for virtio devices"
931 select VIRTUALIZATION
934 Enabling this option adds support for virtio based paravirtual device
937 Select this option if you want to run the kernel as a guest under
944 config S390_UNWIND_SELFTEST
946 prompt "Test unwind functions"
948 This option enables s390 specific stack unwinder testing kernel
949 module. This option is not useful for distributions or general
950 kernels, but only for kernel developers working on architecture code.
952 Say N if you are unsure.