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 PREEMPTTION
38 config ARCH_SUPPORTS_DEBUG_PAGEALLOC
50 config ARCH_SUPPORTS_UPROBES
53 config KASAN_SHADOW_OFFSET
56 default 0x18000000000000 if KASAN_S390_4_LEVEL_PAGING
61 select ARCH_BINFMT_ELF_STATE
62 select ARCH_HAS_DEBUG_VM_PGTABLE
63 select ARCH_HAS_DEVMEM_IS_ALLOWED
64 select ARCH_HAS_ELF_RANDOMIZE
65 select ARCH_HAS_FORTIFY_SOURCE
66 select ARCH_HAS_GCOV_PROFILE_ALL
67 select ARCH_HAS_GIGANTIC_PAGE
69 select ARCH_HAS_MEM_ENCRYPT
70 select ARCH_HAS_PTE_SPECIAL
71 select ARCH_HAS_SET_MEMORY
72 select ARCH_HAS_STRICT_KERNEL_RWX
73 select ARCH_HAS_STRICT_MODULE_RWX
74 select ARCH_HAS_SYSCALL_WRAPPER
75 select ARCH_HAS_UBSAN_SANITIZE_ALL
76 select ARCH_HAVE_NMI_SAFE_CMPXCHG
77 select ARCH_INLINE_READ_LOCK
78 select ARCH_INLINE_READ_LOCK_BH
79 select ARCH_INLINE_READ_LOCK_IRQ
80 select ARCH_INLINE_READ_LOCK_IRQSAVE
81 select ARCH_INLINE_READ_TRYLOCK
82 select ARCH_INLINE_READ_UNLOCK
83 select ARCH_INLINE_READ_UNLOCK_BH
84 select ARCH_INLINE_READ_UNLOCK_IRQ
85 select ARCH_INLINE_READ_UNLOCK_IRQRESTORE
86 select ARCH_INLINE_SPIN_LOCK
87 select ARCH_INLINE_SPIN_LOCK_BH
88 select ARCH_INLINE_SPIN_LOCK_IRQ
89 select ARCH_INLINE_SPIN_LOCK_IRQSAVE
90 select ARCH_INLINE_SPIN_TRYLOCK
91 select ARCH_INLINE_SPIN_TRYLOCK_BH
92 select ARCH_INLINE_SPIN_UNLOCK
93 select ARCH_INLINE_SPIN_UNLOCK_BH
94 select ARCH_INLINE_SPIN_UNLOCK_IRQ
95 select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE
96 select ARCH_INLINE_WRITE_LOCK
97 select ARCH_INLINE_WRITE_LOCK_BH
98 select ARCH_INLINE_WRITE_LOCK_IRQ
99 select ARCH_INLINE_WRITE_LOCK_IRQSAVE
100 select ARCH_INLINE_WRITE_TRYLOCK
101 select ARCH_INLINE_WRITE_UNLOCK
102 select ARCH_INLINE_WRITE_UNLOCK_BH
103 select ARCH_INLINE_WRITE_UNLOCK_IRQ
104 select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE
105 select ARCH_STACKWALK
106 select ARCH_SUPPORTS_ATOMIC_RMW
107 select ARCH_SUPPORTS_NUMA_BALANCING
108 select ARCH_USE_BUILTIN_BSWAP
109 select ARCH_USE_CMPXCHG_LOCKREF
110 select ARCH_WANTS_DYNAMIC_TASK_STRUCT
111 select ARCH_WANT_DEFAULT_BPF_JIT
112 select ARCH_WANT_IPC_PARSE_VERSION
113 select BUILDTIME_TABLE_SORT
114 select CLONE_BACKWARDS2
115 select DMA_OPS if PCI
116 select DYNAMIC_FTRACE if FUNCTION_TRACER
117 select GENERIC_CLOCKEVENTS
118 select GENERIC_CPU_AUTOPROBE
119 select GENERIC_CPU_VULNERABILITIES
120 select GENERIC_FIND_FIRST_BIT
121 select GENERIC_SMP_IDLE_THREAD
122 select GENERIC_TIME_VSYSCALL
123 select HAVE_ALIGNED_STRUCT_PAGE if SLUB
124 select HAVE_ARCH_AUDITSYSCALL
125 select HAVE_ARCH_JUMP_LABEL
126 select HAVE_ARCH_JUMP_LABEL_RELATIVE
127 select HAVE_ARCH_KASAN
128 select HAVE_ARCH_KASAN_VMALLOC
129 select CLOCKSOURCE_VALIDATE_LAST_CYCLE
130 select CPU_NO_EFFICIENT_FFS if !HAVE_MARCH_Z9_109_FEATURES
131 select HAVE_ARCH_SECCOMP_FILTER
132 select HAVE_ARCH_SOFT_DIRTY
133 select HAVE_ARCH_TRACEHOOK
134 select HAVE_ARCH_TRANSPARENT_HUGEPAGE
135 select HAVE_ARCH_VMAP_STACK
136 select HAVE_ASM_MODVERSIONS
137 select HAVE_EBPF_JIT if PACK_STACK && HAVE_MARCH_Z196_FEATURES
138 select HAVE_CMPXCHG_DOUBLE
139 select HAVE_CMPXCHG_LOCAL
140 select HAVE_DEBUG_KMEMLEAK
141 select HAVE_DMA_CONTIGUOUS
142 select HAVE_DYNAMIC_FTRACE
143 select HAVE_DYNAMIC_FTRACE_WITH_REGS
145 select HAVE_EFFICIENT_UNALIGNED_ACCESS
147 select HAVE_FTRACE_MCOUNT_RECORD
148 select HAVE_FUNCTION_ERROR_INJECTION
149 select HAVE_FUNCTION_GRAPH_TRACER
150 select HAVE_FUNCTION_TRACER
151 select HAVE_FUTEX_CMPXCHG if FUTEX
152 select HAVE_GCC_PLUGINS
153 select HAVE_KERNEL_BZIP2
154 select HAVE_KERNEL_GZIP
155 select HAVE_KERNEL_LZ4
156 select HAVE_KERNEL_LZMA
157 select HAVE_KERNEL_LZO
158 select HAVE_KERNEL_UNCOMPRESSED
159 select HAVE_KERNEL_XZ
161 select HAVE_KPROBES_ON_FTRACE
162 select HAVE_KRETPROBES
164 select HAVE_LIVEPATCH
165 select HAVE_PERF_REGS
166 select HAVE_PERF_USER_STACK_DUMP
167 select HAVE_MEMBLOCK_PHYS_MAP
168 select MMU_GATHER_NO_GATHER
169 select HAVE_MOD_ARCH_SPECIFIC
170 select HAVE_NOP_MCOUNT
173 select HAVE_PERF_EVENTS
174 select MMU_GATHER_RCU_TABLE_FREE
175 select HAVE_REGS_AND_STACK_ACCESS_API
176 select HAVE_RELIABLE_STACKTRACE
178 select HAVE_SYSCALL_TRACEPOINTS
179 select HAVE_VIRT_CPU_ACCOUNTING
180 select IOMMU_HELPER if PCI
181 select IOMMU_SUPPORT if PCI
182 select MODULES_USE_ELF_RELA
183 select NEED_DMA_MAP_STATE if PCI
184 select NEED_SG_DMA_LENGTH if PCI
186 select OLD_SIGSUSPEND3
187 select PCI_DOMAINS if PCI
188 select PCI_MSI if PCI
190 select SYSCTL_EXCEPTION_TRACE
191 select THREAD_INFO_IN_TASK
193 select VIRT_CPU_ACCOUNTING
194 select ARCH_HAS_SCALED_CPUTIME
196 select ARCH_HAS_FORCE_DMA_UNENCRYPTED
198 select GENERIC_ALLOCATOR
199 imply IMA_SECURE_AND_OR_TRUSTED_BOOT
202 config SCHED_OMIT_FRAME_POINTER
205 config PGTABLE_LEVELS
209 source "kernel/livepatch/Kconfig"
211 menu "Processor type and features"
213 config HAVE_MARCH_Z900_FEATURES
216 config HAVE_MARCH_Z990_FEATURES
218 select HAVE_MARCH_Z900_FEATURES
220 config HAVE_MARCH_Z9_109_FEATURES
222 select HAVE_MARCH_Z990_FEATURES
224 config HAVE_MARCH_Z10_FEATURES
226 select HAVE_MARCH_Z9_109_FEATURES
228 config HAVE_MARCH_Z196_FEATURES
230 select HAVE_MARCH_Z10_FEATURES
232 config HAVE_MARCH_ZEC12_FEATURES
234 select HAVE_MARCH_Z196_FEATURES
236 config HAVE_MARCH_Z13_FEATURES
238 select HAVE_MARCH_ZEC12_FEATURES
240 config HAVE_MARCH_Z14_FEATURES
242 select HAVE_MARCH_Z13_FEATURES
244 config HAVE_MARCH_Z15_FEATURES
246 select HAVE_MARCH_Z14_FEATURES
249 prompt "Processor type"
253 bool "IBM zSeries model z800 and z900"
254 select HAVE_MARCH_Z900_FEATURES
255 depends on $(cc-option,-march=z900)
257 Select this to enable optimizations for model z800/z900 (2064 and
258 2066 series). This will enable some optimizations that are not
259 available on older ESA/390 (31 Bit) only CPUs.
262 bool "IBM zSeries model z890 and z990"
263 select HAVE_MARCH_Z990_FEATURES
264 depends on $(cc-option,-march=z990)
266 Select this to enable optimizations for model z890/z990 (2084 and
267 2086 series). The kernel will be slightly faster but will not work
272 select HAVE_MARCH_Z9_109_FEATURES
273 depends on $(cc-option,-march=z9-109)
275 Select this to enable optimizations for IBM System z9 (2094 and
276 2096 series). The kernel will be slightly faster but will not work
280 bool "IBM System z10"
281 select HAVE_MARCH_Z10_FEATURES
282 depends on $(cc-option,-march=z10)
284 Select this to enable optimizations for IBM System z10 (2097 and
285 2098 series). The kernel will be slightly faster but will not work
289 bool "IBM zEnterprise 114 and 196"
290 select HAVE_MARCH_Z196_FEATURES
291 depends on $(cc-option,-march=z196)
293 Select this to enable optimizations for IBM zEnterprise 114 and 196
294 (2818 and 2817 series). The kernel will be slightly faster but will
295 not work on older machines.
298 bool "IBM zBC12 and zEC12"
299 select HAVE_MARCH_ZEC12_FEATURES
300 depends on $(cc-option,-march=zEC12)
302 Select this to enable optimizations for IBM zBC12 and zEC12 (2828 and
303 2827 series). The kernel will be slightly faster but will not work on
307 bool "IBM z13s and z13"
308 select HAVE_MARCH_Z13_FEATURES
309 depends on $(cc-option,-march=z13)
311 Select this to enable optimizations for IBM z13s and z13 (2965 and
312 2964 series). The kernel will be slightly faster but will not work on
316 bool "IBM z14 ZR1 and z14"
317 select HAVE_MARCH_Z14_FEATURES
318 depends on $(cc-option,-march=z14)
320 Select this to enable optimizations for IBM z14 ZR1 and z14 (3907
321 and 3906 series). The kernel will be slightly faster but will not
322 work on older machines.
326 select HAVE_MARCH_Z15_FEATURES
327 depends on $(cc-option,-march=z15)
329 Select this to enable optimizations for IBM z15 (8562
330 and 8561 series). The kernel will be slightly faster but will not
331 work on older machines.
335 config MARCH_Z900_TUNE
336 def_bool TUNE_Z900 || MARCH_Z900 && TUNE_DEFAULT
338 config MARCH_Z990_TUNE
339 def_bool TUNE_Z990 || MARCH_Z990 && TUNE_DEFAULT
341 config MARCH_Z9_109_TUNE
342 def_bool TUNE_Z9_109 || MARCH_Z9_109 && TUNE_DEFAULT
344 config MARCH_Z10_TUNE
345 def_bool TUNE_Z10 || MARCH_Z10 && TUNE_DEFAULT
347 config MARCH_Z196_TUNE
348 def_bool TUNE_Z196 || MARCH_Z196 && TUNE_DEFAULT
350 config MARCH_ZEC12_TUNE
351 def_bool TUNE_ZEC12 || MARCH_ZEC12 && TUNE_DEFAULT
353 config MARCH_Z13_TUNE
354 def_bool TUNE_Z13 || MARCH_Z13 && TUNE_DEFAULT
356 config MARCH_Z14_TUNE
357 def_bool TUNE_Z14 || MARCH_Z14 && TUNE_DEFAULT
359 config MARCH_Z15_TUNE
360 def_bool TUNE_Z15 || MARCH_Z15 && TUNE_DEFAULT
363 prompt "Tune code generation"
366 Cause the compiler to tune (-mtune) the generated code for a machine.
367 This will make the code run faster on the selected machine but
368 somewhat slower on other machines.
369 This option only changes how the compiler emits instructions, not the
370 selection of instructions itself, so the resulting kernel will run on
376 Tune the generated code for the target processor for which the kernel
380 bool "IBM zSeries model z800 and z900"
381 depends on $(cc-option,-mtune=z900)
384 bool "IBM zSeries model z890 and z990"
385 depends on $(cc-option,-mtune=z990)
389 depends on $(cc-option,-mtune=z9-109)
392 bool "IBM System z10"
393 depends on $(cc-option,-mtune=z10)
396 bool "IBM zEnterprise 114 and 196"
397 depends on $(cc-option,-mtune=z196)
400 bool "IBM zBC12 and zEC12"
401 depends on $(cc-option,-mtune=zEC12)
404 bool "IBM z13s and z13"
405 depends on $(cc-option,-mtune=z13)
408 bool "IBM z14 ZR1 and z14"
409 depends on $(cc-option,-mtune=z14)
413 depends on $(cc-option,-mtune=z15)
422 prompt "Kernel support for 31 bit emulation"
423 select COMPAT_BINFMT_ELF if BINFMT_ELF
424 select ARCH_WANT_OLD_COMPAT_IPC
425 select COMPAT_OLD_SIGACTION
429 Select this option if you want to enable your system kernel to
430 handle system-calls from ELF binaries for 31 bit ESA. This option
431 (and some other stuff like libraries and such) is needed for
432 executing 31 bit applications. It is safe to say "Y".
434 config SYSVIPC_COMPAT
435 def_bool y if COMPAT && SYSVIPC
441 int "Maximum number of CPUs (2-512)"
445 This allows you to specify the maximum number of CPUs which this
446 kernel will support. The maximum supported value is 512 and the
447 minimum value which makes sense is 2.
449 This is purely to save memory - each supported CPU adds
450 approximately sixteen kilobytes to the kernel image.
457 depends on SCHED_TOPOLOGY
462 This option adds NUMA support to the kernel.
466 depends on NEED_MULTIPLE_NODES
481 config SCHED_TOPOLOGY
483 prompt "Topology scheduler support"
489 Topology scheduler support improves the CPU scheduler's decision
490 making when dealing with machines that have multi-threading,
491 multiple cores or multiple books.
493 source "kernel/Kconfig.hz"
500 bool "kexec file based system call"
504 depends on CRYPTO_SHA256
505 depends on CRYPTO_SHA256_S390
507 Enable the kexec file based system call. In contrast to the normal
508 kexec system call this system call takes file descriptors for the
509 kernel and initramfs as arguments.
511 config ARCH_HAS_KEXEC_PURGATORY
513 depends on KEXEC_FILE
516 bool "Verify kernel signature during kexec_file_load() syscall"
517 depends on KEXEC_FILE && MODULE_SIG_FORMAT
519 This option makes kernel signature verification mandatory for
520 the kexec_file_load() syscall.
522 In addition to that option, you need to enable signature
523 verification for the corresponding kernel image type being
524 loaded in order for this to work.
528 prompt "s390 architectural random number generation API"
530 Enable the s390 architectural random number generation API
531 to provide random data for all consumers within the Linux
534 When enabled the arch_random_* functions declared in linux/random.h
535 are implemented. The implementation is based on the s390 CPACF
536 instruction subfunction TRNG which provides a real true random
543 prompt "Enable modified branch prediction for the kernel by default"
545 If this option is selected the kernel will switch to a modified
546 branch prediction mode if the firmware interface is available.
547 The modified branch prediction mode improves the behaviour in
548 regard to speculative execution.
550 With the option enabled the kernel parameter "nobp=0" or "nospec"
551 can be used to run the kernel in the normal branch prediction mode.
553 With the option disabled the modified branch prediction mode is
554 enabled with the "nobp=1" kernel parameter.
560 prompt "Avoid speculative indirect branches in the kernel"
562 Compile the kernel with the expoline compiler options to guard
563 against kernel-to-user data leaks by avoiding speculative indirect
565 Requires a compiler with -mindirect-branch=thunk support for full
566 protection. The kernel may run slower.
571 prompt "Expoline default"
573 default EXPOLINE_FULL
576 bool "spectre_v2=off"
579 bool "spectre_v2=auto"
587 bool "Build a relocatable kernel"
588 select MODULE_REL_CRCS if MODVERSIONS
591 This builds a kernel image that retains relocation information
592 so it can be loaded at an arbitrary address.
593 The kernel is linked as a position-independent executable (PIE)
594 and contains dynamic relocations which are processed early in the
596 The relocations make the kernel image about 15% larger (compressed
597 10%), but are discarded at runtime.
599 config RANDOMIZE_BASE
600 bool "Randomize the address of the kernel image (KASLR)"
601 depends on RELOCATABLE
604 In support of Kernel Address Space Layout Randomization (KASLR),
605 this randomizes the address at which the kernel image is loaded,
606 as a security feature that deters exploit attempts relying on
607 knowledge of the location of kernel internals.
613 config ARCH_SPARSEMEM_ENABLE
615 select SPARSEMEM_VMEMMAP_ENABLE
616 select SPARSEMEM_VMEMMAP
618 config ARCH_SPARSEMEM_DEFAULT
621 config ARCH_ENABLE_MEMORY_HOTPLUG
622 def_bool y if SPARSEMEM
624 config ARCH_ENABLE_MEMORY_HOTREMOVE
627 config ARCH_ENABLE_SPLIT_PMD_PTLOCK
630 config MAX_PHYSMEM_BITS
631 int "Maximum size of supported physical memory in bits (42-53)"
635 This option specifies the maximum supported size of physical memory
636 in bits. Supported is any size between 2^42 (4TB) and 2^53 (8PB).
637 Increasing the number of bits also increases the kernel image size.
638 By default 46 bits (64TB) are supported.
642 prompt "Pack kernel stack"
644 This option enables the compiler option -mkernel-backchain if it
645 is available. If the option is available the compiler supports
646 the new stack layout which dramatically reduces the minimum stack
647 frame size. With an old compiler a non-leaf function needs a
648 minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
649 -mkernel-backchain the minimum size drops to 16 byte on 31 bit
650 and 24 byte on 64 bit.
652 Say Y if you are unsure.
656 depends on !VMAP_STACK
657 prompt "Detect kernel stack overflow"
659 This option enables the compiler option -mstack-guard and
660 -mstack-size if they are available. If the compiler supports them
661 it will emit additional code to each function prolog to trigger
662 an illegal operation if the kernel stack is about to overflow.
664 Say N if you are unsure.
667 int "Size of the guard area (128-1024)"
669 depends on CHECK_STACK
672 This allows you to specify the size of the guard area at the lower
673 end of the kernel stack. If the kernel stack points into the guard
674 area on function entry an illegal operation is triggered. The size
675 needs to be a power of 2. Please keep in mind that the size of an
676 interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
677 The minimum size for the stack guard should be 256 for 31 bit and
680 config WARN_DYNAMIC_STACK
682 prompt "Emit compiler warnings for function with dynamic stack usage"
684 This option enables the compiler option -mwarn-dynamicstack. If the
685 compiler supports this options generates warnings for functions
686 that dynamically allocate stack space using alloca.
688 Say N if you are unsure.
696 prompt "QDIO support"
698 This driver provides the Queued Direct I/O base support for
701 To compile this driver as a module, choose M here: the
702 module will be called qdio.
708 config PCI_NR_FUNCTIONS
709 int "Maximum number of PCI functions (1-4096)"
713 This allows you to specify the maximum number of PCI functions which
714 this kernel will support.
723 prompt "Support for CHSC subchannels"
725 This driver allows usage of CHSC subchannels. A CHSC subchannel
726 is usually present on LPAR only.
727 The driver creates a device /dev/chsc, which may be used to
728 obtain I/O configuration information about the machine and
729 to issue asynchronous chsc commands (DANGEROUS).
730 You will usually only want to use this interface on a special
731 LPAR designated for system management.
733 To compile this driver as a module, choose M here: the
734 module will be called chsc_sch.
740 prompt "SCM bus driver"
742 Bus driver for Storage Class Memory.
746 prompt "Support for EADM subchannels"
749 This driver allows usage of EADM subchannels. EADM subchannels act
750 as a communication vehicle for SCM increments.
752 To compile this driver as a module, choose M here: the
753 module will be called eadm_sch.
757 prompt "Support for VFIO-CCW subchannels"
758 depends on S390_CCW_IOMMU && VFIO_MDEV
760 This driver allows usage of I/O subchannels via VFIO-CCW.
762 To compile this driver as a module, choose M here: the
763 module will be called vfio_ccw.
767 prompt "VFIO support for AP devices"
768 depends on S390_AP_IOMMU && VFIO_MDEV_DEVICE && KVM
770 This driver grants access to Adjunct Processor (AP) devices
771 via the VFIO mediated device interface.
773 To compile this driver as a module, choose M here: the module
774 will be called vfio_ap.
781 bool "kernel crash dumps"
784 Generate crash dump after being started by kexec.
785 Crash dump kernels are loaded in the main kernel with kexec-tools
786 into a specially reserved region and then later executed after
787 a crash by kdump/kexec.
788 Refer to <file:Documentation/s390/zfcpdump.rst> for more details on this.
789 This option also enables s390 zfcpdump.
790 See also <file:Documentation/s390/zfcpdump.rst>
796 prompt "Enable seccomp to safely compute untrusted bytecode"
799 This kernel feature is useful for number crunching applications
800 that may need to compute untrusted bytecode during their
801 execution. By using pipes or other transports made available to
802 the process as file descriptors supporting the read/write
803 syscalls, it's possible to isolate those applications in
804 their own address space using seccomp. Once seccomp is
805 enabled via /proc/<pid>/seccomp, it cannot be disabled
806 and the task is only allowed to execute a few safe syscalls
807 defined by each seccomp mode.
816 default (SMC || CCWGROUP)
818 menu "Virtualization"
820 config PROTECTED_VIRTUALIZATION_GUEST
822 prompt "Protected virtualization guest support"
824 Select this option, if you want to be able to run this
825 kernel as a protected virtualization KVM guest.
826 Protected virtualization capable machines have a mini hypervisor
827 located at machine level (an ultravisor). With help of the
828 Ultravisor, KVM will be able to run "protected" VMs, special
829 VMs whose memory and management data are unavailable to KVM.
833 prompt "Pseudo page fault support"
835 Select this option, if you want to use PFAULT pseudo page fault
836 handling under VM. If running native or in LPAR, this option
837 has no effect. If your VM does not support PFAULT, PAGEEX
838 pseudo page fault handling will be used.
839 Note that VM 4.2 supports PFAULT but has a bug in its
840 implementation that causes some problems.
841 Everybody who wants to run Linux under VM != VM4.2 should select
846 prompt "Cooperative memory management"
848 Select this option, if you want to enable the kernel interface
849 to reduce the memory size of the system. This is accomplished
850 by allocating pages of memory and put them "on hold". This only
851 makes sense for a system running under VM where the unused pages
852 will be reused by VM for other guest systems. The interface
853 allows an external monitor to balance memory of many systems.
854 Everybody who wants to run Linux under VM should select this
859 prompt "IUCV special message interface to cooperative memory management"
860 depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
862 Select this option to enable the special message interface to
863 the cooperative memory management.
867 prompt "Linux - VM Monitor Stream, base infrastructure"
870 This provides a kernel interface for creating and updating z/VM APPLDATA
871 monitor records. The monitor records are updated at certain time
872 intervals, once the timer is started.
873 Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
874 i.e. enables or disables monitoring on the Linux side.
875 A custom interval value (in seconds) can be written to
876 /proc/appldata/interval.
878 Defaults are 60 seconds interval and timer off.
879 The /proc entries can also be read from, showing the current settings.
883 prompt "Monitor memory management statistics"
884 depends on APPLDATA_BASE && VM_EVENT_COUNTERS
886 This provides memory management related data to the Linux - VM Monitor
887 Stream, like paging/swapping rate, memory utilisation, etc.
888 Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
889 APPLDATA monitor record, i.e. enables or disables monitoring this record
893 The /proc entry can also be read from, showing the current settings.
895 This can also be compiled as a module, which will be called
900 prompt "Monitor OS statistics"
901 depends on APPLDATA_BASE
903 This provides OS related data to the Linux - VM Monitor Stream, like
904 CPU utilisation, etc.
905 Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
906 APPLDATA monitor record, i.e. enables or disables monitoring this record
910 This can also be compiled as a module, which will be called
913 config APPLDATA_NET_SUM
915 prompt "Monitor overall network statistics"
916 depends on APPLDATA_BASE && NET
918 This provides network related data to the Linux - VM Monitor Stream,
919 currently there is only a total sum of network I/O statistics, no
921 Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
922 APPLDATA monitor record, i.e. enables or disables monitoring this record
926 This can also be compiled as a module, which will be called
931 prompt "s390 hypervisor file system support"
932 select SYS_HYPERVISOR
934 This is a virtual file system intended to provide accounting
935 information in an s390 hypervisor environment.
937 source "arch/s390/kvm/Kconfig"
941 prompt "s390 support for virtio devices"
943 select VIRTUALIZATION
946 Enabling this option adds support for virtio based paravirtual device
949 Select this option if you want to run the kernel as a guest under
956 config S390_UNWIND_SELFTEST
958 prompt "Test unwind functions"
960 This option enables s390 specific stack unwinder testing kernel
961 module. This option is not useful for distributions or general
962 kernels, but only for kernel developers working on architecture code.
964 Say N if you are unsure.