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_BINFMT_ELF_STATE
62 select ARCH_HAS_DEBUG_VM_PGTABLE
63 select ARCH_HAS_DEBUG_WX
64 select ARCH_HAS_DEVMEM_IS_ALLOWED
65 select ARCH_HAS_ELF_RANDOMIZE
66 select ARCH_HAS_FORCE_DMA_UNENCRYPTED
67 select ARCH_HAS_FORTIFY_SOURCE
68 select ARCH_HAS_GCOV_PROFILE_ALL
69 select ARCH_HAS_GIGANTIC_PAGE
71 select ARCH_HAS_MEM_ENCRYPT
72 select ARCH_HAS_PTE_SPECIAL
73 select ARCH_HAS_SCALED_CPUTIME
74 select ARCH_HAS_SET_MEMORY
75 select ARCH_HAS_STRICT_KERNEL_RWX
76 select ARCH_HAS_STRICT_MODULE_RWX
77 select ARCH_HAS_SYSCALL_WRAPPER
78 select ARCH_HAS_UBSAN_SANITIZE_ALL
79 select ARCH_HAS_VDSO_DATA
80 select ARCH_HAVE_NMI_SAFE_CMPXCHG
81 select ARCH_INLINE_READ_LOCK
82 select ARCH_INLINE_READ_LOCK_BH
83 select ARCH_INLINE_READ_LOCK_IRQ
84 select ARCH_INLINE_READ_LOCK_IRQSAVE
85 select ARCH_INLINE_READ_TRYLOCK
86 select ARCH_INLINE_READ_UNLOCK
87 select ARCH_INLINE_READ_UNLOCK_BH
88 select ARCH_INLINE_READ_UNLOCK_IRQ
89 select ARCH_INLINE_READ_UNLOCK_IRQRESTORE
90 select ARCH_INLINE_SPIN_LOCK
91 select ARCH_INLINE_SPIN_LOCK_BH
92 select ARCH_INLINE_SPIN_LOCK_IRQ
93 select ARCH_INLINE_SPIN_LOCK_IRQSAVE
94 select ARCH_INLINE_SPIN_TRYLOCK
95 select ARCH_INLINE_SPIN_TRYLOCK_BH
96 select ARCH_INLINE_SPIN_UNLOCK
97 select ARCH_INLINE_SPIN_UNLOCK_BH
98 select ARCH_INLINE_SPIN_UNLOCK_IRQ
99 select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE
100 select ARCH_INLINE_WRITE_LOCK
101 select ARCH_INLINE_WRITE_LOCK_BH
102 select ARCH_INLINE_WRITE_LOCK_IRQ
103 select ARCH_INLINE_WRITE_LOCK_IRQSAVE
104 select ARCH_INLINE_WRITE_TRYLOCK
105 select ARCH_INLINE_WRITE_UNLOCK
106 select ARCH_INLINE_WRITE_UNLOCK_BH
107 select ARCH_INLINE_WRITE_UNLOCK_IRQ
108 select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE
109 select ARCH_STACKWALK
110 select ARCH_SUPPORTS_ATOMIC_RMW
111 select ARCH_SUPPORTS_DEBUG_PAGEALLOC
112 select ARCH_SUPPORTS_NUMA_BALANCING
113 select ARCH_USE_BUILTIN_BSWAP
114 select ARCH_USE_CMPXCHG_LOCKREF
115 select ARCH_WANTS_DYNAMIC_TASK_STRUCT
116 select ARCH_WANT_DEFAULT_BPF_JIT
117 select ARCH_WANT_IPC_PARSE_VERSION
118 select BUILDTIME_TABLE_SORT
119 select CLONE_BACKWARDS2
120 select CPU_NO_EFFICIENT_FFS if !HAVE_MARCH_Z9_109_FEATURES
121 select DMA_OPS if PCI
122 select DYNAMIC_FTRACE if FUNCTION_TRACER
123 select GENERIC_ALLOCATOR
124 select GENERIC_CPU_AUTOPROBE
125 select GENERIC_CPU_VULNERABILITIES
126 select GENERIC_FIND_FIRST_BIT
127 select GENERIC_GETTIMEOFDAY
128 select GENERIC_PTDUMP
129 select GENERIC_SMP_IDLE_THREAD
130 select GENERIC_TIME_VSYSCALL
131 select HAVE_ALIGNED_STRUCT_PAGE if SLUB
132 select HAVE_ARCH_AUDITSYSCALL
133 select HAVE_ARCH_JUMP_LABEL
134 select HAVE_ARCH_JUMP_LABEL_RELATIVE
135 select HAVE_ARCH_KASAN
136 select HAVE_ARCH_KASAN_VMALLOC
137 select HAVE_ARCH_SECCOMP_FILTER
138 select HAVE_ARCH_SOFT_DIRTY
139 select HAVE_ARCH_TRACEHOOK
140 select HAVE_ARCH_TRANSPARENT_HUGEPAGE
141 select HAVE_ARCH_VMAP_STACK
142 select HAVE_ASM_MODVERSIONS
143 select HAVE_CMPXCHG_DOUBLE
144 select HAVE_CMPXCHG_LOCAL
145 select HAVE_DEBUG_KMEMLEAK
146 select HAVE_DMA_CONTIGUOUS
147 select HAVE_DYNAMIC_FTRACE
148 select HAVE_DYNAMIC_FTRACE_WITH_REGS
149 select HAVE_EBPF_JIT if PACK_STACK && HAVE_MARCH_Z196_FEATURES
150 select HAVE_EFFICIENT_UNALIGNED_ACCESS
153 select HAVE_FTRACE_MCOUNT_RECORD
154 select HAVE_FUNCTION_ERROR_INJECTION
155 select HAVE_FUNCTION_GRAPH_TRACER
156 select HAVE_FUNCTION_TRACER
157 select HAVE_FUTEX_CMPXCHG if FUTEX
158 select HAVE_GCC_PLUGINS
159 select HAVE_GENERIC_VDSO
160 select HAVE_IRQ_EXIT_ON_IRQ_STACK
161 select HAVE_KERNEL_BZIP2
162 select HAVE_KERNEL_GZIP
163 select HAVE_KERNEL_LZ4
164 select HAVE_KERNEL_LZMA
165 select HAVE_KERNEL_LZO
166 select HAVE_KERNEL_UNCOMPRESSED
167 select HAVE_KERNEL_XZ
169 select HAVE_KPROBES_ON_FTRACE
170 select HAVE_KRETPROBES
172 select HAVE_LIVEPATCH
173 select HAVE_MEMBLOCK_PHYS_MAP
174 select HAVE_MOD_ARCH_SPECIFIC
176 select HAVE_NOP_MCOUNT
178 select HAVE_PERF_EVENTS
179 select HAVE_PERF_REGS
180 select HAVE_PERF_USER_STACK_DUMP
181 select HAVE_REGS_AND_STACK_ACCESS_API
182 select HAVE_RELIABLE_STACKTRACE
184 select HAVE_SYSCALL_TRACEPOINTS
185 select HAVE_VIRT_CPU_ACCOUNTING
186 select HAVE_VIRT_CPU_ACCOUNTING_IDLE
187 select IOMMU_HELPER if PCI
188 select IOMMU_SUPPORT if PCI
189 select MMU_GATHER_NO_GATHER
190 select MMU_GATHER_RCU_TABLE_FREE
191 select MODULES_USE_ELF_RELA
192 select NEED_DMA_MAP_STATE if PCI
193 select NEED_SG_DMA_LENGTH if PCI
195 select OLD_SIGSUSPEND3
196 select PCI_DOMAINS if PCI
197 select PCI_MSI if PCI
198 select PCI_MSI_ARCH_FALLBACKS if PCI_MSI
201 select SYSCTL_EXCEPTION_TRACE
202 select THREAD_INFO_IN_TASK
204 select VIRT_CPU_ACCOUNTING
205 # Note: keep the above list sorted alphabetically
207 config SCHED_OMIT_FRAME_POINTER
210 config PGTABLE_LEVELS
214 source "kernel/livepatch/Kconfig"
216 menu "Processor type and features"
218 config HAVE_MARCH_Z900_FEATURES
221 config HAVE_MARCH_Z990_FEATURES
223 select HAVE_MARCH_Z900_FEATURES
225 config HAVE_MARCH_Z9_109_FEATURES
227 select HAVE_MARCH_Z990_FEATURES
229 config HAVE_MARCH_Z10_FEATURES
231 select HAVE_MARCH_Z9_109_FEATURES
233 config HAVE_MARCH_Z196_FEATURES
235 select HAVE_MARCH_Z10_FEATURES
237 config HAVE_MARCH_ZEC12_FEATURES
239 select HAVE_MARCH_Z196_FEATURES
241 config HAVE_MARCH_Z13_FEATURES
243 select HAVE_MARCH_ZEC12_FEATURES
245 config HAVE_MARCH_Z14_FEATURES
247 select HAVE_MARCH_Z13_FEATURES
249 config HAVE_MARCH_Z15_FEATURES
251 select HAVE_MARCH_Z14_FEATURES
254 prompt "Processor type"
258 bool "IBM zSeries model z800 and z900"
259 select HAVE_MARCH_Z900_FEATURES
260 depends on $(cc-option,-march=z900)
262 Select this to enable optimizations for model z800/z900 (2064 and
263 2066 series). This will enable some optimizations that are not
264 available on older ESA/390 (31 Bit) only CPUs.
267 bool "IBM zSeries model z890 and z990"
268 select HAVE_MARCH_Z990_FEATURES
269 depends on $(cc-option,-march=z990)
271 Select this to enable optimizations for model z890/z990 (2084 and
272 2086 series). The kernel will be slightly faster but will not work
277 select HAVE_MARCH_Z9_109_FEATURES
278 depends on $(cc-option,-march=z9-109)
280 Select this to enable optimizations for IBM System z9 (2094 and
281 2096 series). The kernel will be slightly faster but will not work
285 bool "IBM System z10"
286 select HAVE_MARCH_Z10_FEATURES
287 depends on $(cc-option,-march=z10)
289 Select this to enable optimizations for IBM System z10 (2097 and
290 2098 series). The kernel will be slightly faster but will not work
294 bool "IBM zEnterprise 114 and 196"
295 select HAVE_MARCH_Z196_FEATURES
296 depends on $(cc-option,-march=z196)
298 Select this to enable optimizations for IBM zEnterprise 114 and 196
299 (2818 and 2817 series). The kernel will be slightly faster but will
300 not work on older machines.
303 bool "IBM zBC12 and zEC12"
304 select HAVE_MARCH_ZEC12_FEATURES
305 depends on $(cc-option,-march=zEC12)
307 Select this to enable optimizations for IBM zBC12 and zEC12 (2828 and
308 2827 series). The kernel will be slightly faster but will not work on
312 bool "IBM z13s and z13"
313 select HAVE_MARCH_Z13_FEATURES
314 depends on $(cc-option,-march=z13)
316 Select this to enable optimizations for IBM z13s and z13 (2965 and
317 2964 series). The kernel will be slightly faster but will not work on
321 bool "IBM z14 ZR1 and z14"
322 select HAVE_MARCH_Z14_FEATURES
323 depends on $(cc-option,-march=z14)
325 Select this to enable optimizations for IBM z14 ZR1 and z14 (3907
326 and 3906 series). The kernel will be slightly faster but will not
327 work on older machines.
331 select HAVE_MARCH_Z15_FEATURES
332 depends on $(cc-option,-march=z15)
334 Select this to enable optimizations for IBM z15 (8562
335 and 8561 series). The kernel will be slightly faster but will not
336 work on older machines.
340 config MARCH_Z900_TUNE
341 def_bool TUNE_Z900 || MARCH_Z900 && TUNE_DEFAULT
343 config MARCH_Z990_TUNE
344 def_bool TUNE_Z990 || MARCH_Z990 && TUNE_DEFAULT
346 config MARCH_Z9_109_TUNE
347 def_bool TUNE_Z9_109 || MARCH_Z9_109 && TUNE_DEFAULT
349 config MARCH_Z10_TUNE
350 def_bool TUNE_Z10 || MARCH_Z10 && TUNE_DEFAULT
352 config MARCH_Z196_TUNE
353 def_bool TUNE_Z196 || MARCH_Z196 && TUNE_DEFAULT
355 config MARCH_ZEC12_TUNE
356 def_bool TUNE_ZEC12 || MARCH_ZEC12 && TUNE_DEFAULT
358 config MARCH_Z13_TUNE
359 def_bool TUNE_Z13 || MARCH_Z13 && TUNE_DEFAULT
361 config MARCH_Z14_TUNE
362 def_bool TUNE_Z14 || MARCH_Z14 && TUNE_DEFAULT
364 config MARCH_Z15_TUNE
365 def_bool TUNE_Z15 || MARCH_Z15 && TUNE_DEFAULT
368 prompt "Tune code generation"
371 Cause the compiler to tune (-mtune) the generated code for a machine.
372 This will make the code run faster on the selected machine but
373 somewhat slower on other machines.
374 This option only changes how the compiler emits instructions, not the
375 selection of instructions itself, so the resulting kernel will run on
381 Tune the generated code for the target processor for which the kernel
385 bool "IBM zSeries model z800 and z900"
386 depends on $(cc-option,-mtune=z900)
389 bool "IBM zSeries model z890 and z990"
390 depends on $(cc-option,-mtune=z990)
394 depends on $(cc-option,-mtune=z9-109)
397 bool "IBM System z10"
398 depends on $(cc-option,-mtune=z10)
401 bool "IBM zEnterprise 114 and 196"
402 depends on $(cc-option,-mtune=z196)
405 bool "IBM zBC12 and zEC12"
406 depends on $(cc-option,-mtune=zEC12)
409 bool "IBM z13s and z13"
410 depends on $(cc-option,-mtune=z13)
413 bool "IBM z14 ZR1 and z14"
414 depends on $(cc-option,-mtune=z14)
418 depends on $(cc-option,-mtune=z15)
427 prompt "Kernel support for 31 bit emulation"
428 select ARCH_WANT_OLD_COMPAT_IPC
429 select COMPAT_OLD_SIGACTION
433 Select this option if you want to enable your system kernel to
434 handle system-calls from ELF binaries for 31 bit ESA. This option
435 (and some other stuff like libraries and such) is needed for
436 executing 31 bit applications. It is safe to say "Y".
438 config SYSVIPC_COMPAT
439 def_bool y if COMPAT && SYSVIPC
445 int "Maximum number of CPUs (2-512)"
449 This allows you to specify the maximum number of CPUs which this
450 kernel will support. The maximum supported value is 512 and the
451 minimum value which makes sense is 2.
453 This is purely to save memory - each supported CPU adds
454 approximately sixteen kilobytes to the kernel image.
461 depends on SCHED_TOPOLOGY
466 This option adds NUMA support to the kernel.
470 depends on NEED_MULTIPLE_NODES
485 config SCHED_TOPOLOGY
487 prompt "Topology scheduler support"
493 Topology scheduler support improves the CPU scheduler's decision
494 making when dealing with machines that have multi-threading,
495 multiple cores or multiple books.
497 source "kernel/Kconfig.hz"
504 bool "kexec file based system call"
508 depends on CRYPTO_SHA256
509 depends on CRYPTO_SHA256_S390
511 Enable the kexec file based system call. In contrast to the normal
512 kexec system call this system call takes file descriptors for the
513 kernel and initramfs as arguments.
515 config ARCH_HAS_KEXEC_PURGATORY
517 depends on KEXEC_FILE
520 bool "Verify kernel signature during kexec_file_load() syscall"
521 depends on KEXEC_FILE && MODULE_SIG_FORMAT
523 This option makes kernel signature verification mandatory for
524 the kexec_file_load() syscall.
526 In addition to that option, you need to enable signature
527 verification for the corresponding kernel image type being
528 loaded in order for this to work.
532 prompt "s390 architectural random number generation API"
534 Enable the s390 architectural random number generation API
535 to provide random data for all consumers within the Linux
538 When enabled the arch_random_* functions declared in linux/random.h
539 are implemented. The implementation is based on the s390 CPACF
540 instruction subfunction TRNG which provides a real true random
547 prompt "Enable modified branch prediction for the kernel by default"
549 If this option is selected the kernel will switch to a modified
550 branch prediction mode if the firmware interface is available.
551 The modified branch prediction mode improves the behaviour in
552 regard to speculative execution.
554 With the option enabled the kernel parameter "nobp=0" or "nospec"
555 can be used to run the kernel in the normal branch prediction mode.
557 With the option disabled the modified branch prediction mode is
558 enabled with the "nobp=1" kernel parameter.
564 prompt "Avoid speculative indirect branches in the kernel"
566 Compile the kernel with the expoline compiler options to guard
567 against kernel-to-user data leaks by avoiding speculative indirect
569 Requires a compiler with -mindirect-branch=thunk support for full
570 protection. The kernel may run slower.
575 prompt "Expoline default"
577 default EXPOLINE_FULL
580 bool "spectre_v2=off"
583 bool "spectre_v2=auto"
591 bool "Build a relocatable kernel"
592 select MODULE_REL_CRCS if MODVERSIONS
595 This builds a kernel image that retains relocation information
596 so it can be loaded at an arbitrary address.
597 The kernel is linked as a position-independent executable (PIE)
598 and contains dynamic relocations which are processed early in the
600 The relocations make the kernel image about 15% larger (compressed
601 10%), but are discarded at runtime.
603 config RANDOMIZE_BASE
604 bool "Randomize the address of the kernel image (KASLR)"
605 depends on RELOCATABLE
608 In support of Kernel Address Space Layout Randomization (KASLR),
609 this randomizes the address at which the kernel image is loaded,
610 as a security feature that deters exploit attempts relying on
611 knowledge of the location of kernel internals.
617 config ARCH_SPARSEMEM_ENABLE
619 select SPARSEMEM_VMEMMAP_ENABLE
620 select SPARSEMEM_VMEMMAP
622 config ARCH_SPARSEMEM_DEFAULT
625 config ARCH_ENABLE_MEMORY_HOTPLUG
626 def_bool y if SPARSEMEM
628 config ARCH_ENABLE_MEMORY_HOTREMOVE
631 config ARCH_ENABLE_SPLIT_PMD_PTLOCK
634 config MAX_PHYSMEM_BITS
635 int "Maximum size of supported physical memory in bits (42-53)"
639 This option specifies the maximum supported size of physical memory
640 in bits. Supported is any size between 2^42 (4TB) and 2^53 (8PB).
641 Increasing the number of bits also increases the kernel image size.
642 By default 46 bits (64TB) are supported.
646 prompt "Pack kernel stack"
648 This option enables the compiler option -mkernel-backchain if it
649 is available. If the option is available the compiler supports
650 the new stack layout which dramatically reduces the minimum stack
651 frame size. With an old compiler a non-leaf function needs a
652 minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
653 -mkernel-backchain the minimum size drops to 16 byte on 31 bit
654 and 24 byte on 64 bit.
656 Say Y if you are unsure.
660 depends on !VMAP_STACK
661 prompt "Detect kernel stack overflow"
663 This option enables the compiler option -mstack-guard and
664 -mstack-size if they are available. If the compiler supports them
665 it will emit additional code to each function prolog to trigger
666 an illegal operation if the kernel stack is about to overflow.
668 Say N if you are unsure.
671 int "Size of the guard area (128-1024)"
673 depends on CHECK_STACK
676 This allows you to specify the size of the guard area at the lower
677 end of the kernel stack. If the kernel stack points into the guard
678 area on function entry an illegal operation is triggered. The size
679 needs to be a power of 2. Please keep in mind that the size of an
680 interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
681 The minimum size for the stack guard should be 256 for 31 bit and
684 config WARN_DYNAMIC_STACK
686 prompt "Emit compiler warnings for function with dynamic stack usage"
688 This option enables the compiler option -mwarn-dynamicstack. If the
689 compiler supports this options generates warnings for functions
690 that dynamically allocate stack space using alloca.
692 Say N if you are unsure.
700 prompt "QDIO support"
702 This driver provides the Queued Direct I/O base support for
705 To compile this driver as a module, choose M here: the
706 module will be called qdio.
712 config PCI_NR_FUNCTIONS
713 int "Maximum number of PCI functions (1-4096)"
717 This allows you to specify the maximum number of PCI functions which
718 this kernel will support.
727 prompt "Support for CHSC subchannels"
729 This driver allows usage of CHSC subchannels. A CHSC subchannel
730 is usually present on LPAR only.
731 The driver creates a device /dev/chsc, which may be used to
732 obtain I/O configuration information about the machine and
733 to issue asynchronous chsc commands (DANGEROUS).
734 You will usually only want to use this interface on a special
735 LPAR designated for system management.
737 To compile this driver as a module, choose M here: the
738 module will be called chsc_sch.
744 prompt "SCM bus driver"
746 Bus driver for Storage Class Memory.
750 prompt "Support for EADM subchannels"
753 This driver allows usage of EADM subchannels. EADM subchannels act
754 as a communication vehicle for SCM increments.
756 To compile this driver as a module, choose M here: the
757 module will be called eadm_sch.
761 prompt "Support for VFIO-CCW subchannels"
762 depends on S390_CCW_IOMMU && VFIO_MDEV
764 This driver allows usage of I/O subchannels via VFIO-CCW.
766 To compile this driver as a module, choose M here: the
767 module will be called vfio_ccw.
771 prompt "VFIO support for AP devices"
772 depends on S390_AP_IOMMU && VFIO_MDEV_DEVICE && KVM
775 This driver grants access to Adjunct Processor (AP) devices
776 via the VFIO mediated device interface.
778 To compile this driver as a module, choose M here: the module
779 will be called vfio_ap.
786 bool "kernel crash dumps"
789 Generate crash dump after being started by kexec.
790 Crash dump kernels are loaded in the main kernel with kexec-tools
791 into a specially reserved region and then later executed after
792 a crash by kdump/kexec.
793 Refer to <file:Documentation/s390/zfcpdump.rst> for more details on this.
794 This option also enables s390 zfcpdump.
795 See also <file:Documentation/s390/zfcpdump.rst>
804 default (SMC || CCWGROUP)
806 menu "Virtualization"
808 config PROTECTED_VIRTUALIZATION_GUEST
810 prompt "Protected virtualization guest support"
811 select ARCH_HAS_RESTRICTED_VIRTIO_MEMORY_ACCESS
813 Select this option, if you want to be able to run this
814 kernel as a protected virtualization KVM guest.
815 Protected virtualization capable machines have a mini hypervisor
816 located at machine level (an ultravisor). With help of the
817 Ultravisor, KVM will be able to run "protected" VMs, special
818 VMs whose memory and management data are unavailable to KVM.
822 prompt "Pseudo page fault support"
824 Select this option, if you want to use PFAULT pseudo page fault
825 handling under VM. If running native or in LPAR, this option
826 has no effect. If your VM does not support PFAULT, PAGEEX
827 pseudo page fault handling will be used.
828 Note that VM 4.2 supports PFAULT but has a bug in its
829 implementation that causes some problems.
830 Everybody who wants to run Linux under VM != VM4.2 should select
835 prompt "Cooperative memory management"
837 Select this option, if you want to enable the kernel interface
838 to reduce the memory size of the system. This is accomplished
839 by allocating pages of memory and put them "on hold". This only
840 makes sense for a system running under VM where the unused pages
841 will be reused by VM for other guest systems. The interface
842 allows an external monitor to balance memory of many systems.
843 Everybody who wants to run Linux under VM should select this
848 prompt "IUCV special message interface to cooperative memory management"
849 depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
851 Select this option to enable the special message interface to
852 the cooperative memory management.
856 prompt "Linux - VM Monitor Stream, base infrastructure"
859 This provides a kernel interface for creating and updating z/VM APPLDATA
860 monitor records. The monitor records are updated at certain time
861 intervals, once the timer is started.
862 Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
863 i.e. enables or disables monitoring on the Linux side.
864 A custom interval value (in seconds) can be written to
865 /proc/appldata/interval.
867 Defaults are 60 seconds interval and timer off.
868 The /proc entries can also be read from, showing the current settings.
872 prompt "Monitor memory management statistics"
873 depends on APPLDATA_BASE && VM_EVENT_COUNTERS
875 This provides memory management related data to the Linux - VM Monitor
876 Stream, like paging/swapping rate, memory utilisation, etc.
877 Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
878 APPLDATA monitor record, i.e. enables or disables monitoring this record
882 The /proc entry can also be read from, showing the current settings.
884 This can also be compiled as a module, which will be called
889 prompt "Monitor OS statistics"
890 depends on APPLDATA_BASE
892 This provides OS related data to the Linux - VM Monitor Stream, like
893 CPU utilisation, etc.
894 Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
895 APPLDATA monitor record, i.e. enables or disables monitoring this record
899 This can also be compiled as a module, which will be called
902 config APPLDATA_NET_SUM
904 prompt "Monitor overall network statistics"
905 depends on APPLDATA_BASE && NET
907 This provides network related data to the Linux - VM Monitor Stream,
908 currently there is only a total sum of network I/O statistics, no
910 Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
911 APPLDATA monitor record, i.e. enables or disables monitoring this record
915 This can also be compiled as a module, which will be called
920 prompt "s390 hypervisor file system support"
921 select SYS_HYPERVISOR
923 This is a virtual file system intended to provide accounting
924 information in an s390 hypervisor environment.
926 source "arch/s390/kvm/Kconfig"
930 prompt "s390 support for virtio devices"
932 select VIRTUALIZATION
935 Enabling this option adds support for virtio based paravirtual device
938 Select this option if you want to run the kernel as a guest under
945 config S390_UNWIND_SELFTEST
947 prompt "Test unwind functions"
949 This option enables s390 specific stack unwinder testing kernel
950 module. This option is not useful for distributions or general
951 kernels, but only for kernel developers working on architecture code.
953 Say N if you are unsure.