1 # SPDX-License-Identifier: GPL-2.0
11 config STACKTRACE_SUPPORT
14 config ARCH_HAS_ILOG2_U32
17 config ARCH_HAS_ILOG2_U64
20 config GENERIC_HWEIGHT
26 config GENERIC_BUG_RELATIVE_POINTERS
29 config GENERIC_LOCKBREAK
30 def_bool y if PREEMPTION
44 config ARCH_SUPPORTS_UPROBES
47 config KASAN_SHADOW_OFFSET
50 default 0x18000000000000
55 # Note: keep this list sorted alphabetically
57 imply IMA_SECURE_AND_OR_TRUSTED_BOOT
58 select ARCH_32BIT_USTAT_F_TINODE
59 select ARCH_BINFMT_ELF_STATE
60 select ARCH_ENABLE_MEMORY_HOTPLUG if SPARSEMEM
61 select ARCH_ENABLE_MEMORY_HOTREMOVE
62 select ARCH_ENABLE_SPLIT_PMD_PTLOCK if PGTABLE_LEVELS > 2
63 select ARCH_HAS_DEBUG_VM_PGTABLE
64 select ARCH_HAS_DEBUG_WX
65 select ARCH_HAS_DEVMEM_IS_ALLOWED
66 select ARCH_HAS_ELF_RANDOMIZE
67 select ARCH_HAS_FORCE_DMA_UNENCRYPTED
68 select ARCH_HAS_FORTIFY_SOURCE
69 select ARCH_HAS_GCOV_PROFILE_ALL
70 select ARCH_HAS_GIGANTIC_PAGE
72 select ARCH_HAS_MEM_ENCRYPT
73 select ARCH_HAS_PTE_SPECIAL
74 select ARCH_HAS_SCALED_CPUTIME
75 select ARCH_HAS_SET_MEMORY
76 select ARCH_HAS_STRICT_KERNEL_RWX
77 select ARCH_HAS_STRICT_MODULE_RWX
78 select ARCH_HAS_SYSCALL_WRAPPER
79 select ARCH_HAS_UBSAN_SANITIZE_ALL
80 select ARCH_HAS_VDSO_DATA
81 select ARCH_HAVE_NMI_SAFE_CMPXCHG
82 select ARCH_INLINE_READ_LOCK
83 select ARCH_INLINE_READ_LOCK_BH
84 select ARCH_INLINE_READ_LOCK_IRQ
85 select ARCH_INLINE_READ_LOCK_IRQSAVE
86 select ARCH_INLINE_READ_TRYLOCK
87 select ARCH_INLINE_READ_UNLOCK
88 select ARCH_INLINE_READ_UNLOCK_BH
89 select ARCH_INLINE_READ_UNLOCK_IRQ
90 select ARCH_INLINE_READ_UNLOCK_IRQRESTORE
91 select ARCH_INLINE_SPIN_LOCK
92 select ARCH_INLINE_SPIN_LOCK_BH
93 select ARCH_INLINE_SPIN_LOCK_IRQ
94 select ARCH_INLINE_SPIN_LOCK_IRQSAVE
95 select ARCH_INLINE_SPIN_TRYLOCK
96 select ARCH_INLINE_SPIN_TRYLOCK_BH
97 select ARCH_INLINE_SPIN_UNLOCK
98 select ARCH_INLINE_SPIN_UNLOCK_BH
99 select ARCH_INLINE_SPIN_UNLOCK_IRQ
100 select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE
101 select ARCH_INLINE_WRITE_LOCK
102 select ARCH_INLINE_WRITE_LOCK_BH
103 select ARCH_INLINE_WRITE_LOCK_IRQ
104 select ARCH_INLINE_WRITE_LOCK_IRQSAVE
105 select ARCH_INLINE_WRITE_TRYLOCK
106 select ARCH_INLINE_WRITE_UNLOCK
107 select ARCH_INLINE_WRITE_UNLOCK_BH
108 select ARCH_INLINE_WRITE_UNLOCK_IRQ
109 select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE
110 select ARCH_STACKWALK
111 select ARCH_SUPPORTS_ATOMIC_RMW
112 select ARCH_SUPPORTS_DEBUG_PAGEALLOC
113 select ARCH_SUPPORTS_NUMA_BALANCING
114 select ARCH_USE_BUILTIN_BSWAP
115 select ARCH_USE_CMPXCHG_LOCKREF
116 select ARCH_WANTS_DYNAMIC_TASK_STRUCT
117 select ARCH_WANTS_NO_INSTR
118 select ARCH_WANT_DEFAULT_BPF_JIT
119 select ARCH_WANT_IPC_PARSE_VERSION
120 select BUILDTIME_TABLE_SORT
121 select CLONE_BACKWARDS2
122 select CPU_NO_EFFICIENT_FFS if !HAVE_MARCH_Z9_109_FEATURES
123 select DMA_OPS if PCI
124 select DYNAMIC_FTRACE if FUNCTION_TRACER
125 select GENERIC_ALLOCATOR
126 select GENERIC_CPU_AUTOPROBE
127 select GENERIC_CPU_VULNERABILITIES
129 select GENERIC_FIND_FIRST_BIT
130 select GENERIC_GETTIMEOFDAY
131 select GENERIC_PTDUMP
132 select GENERIC_SMP_IDLE_THREAD
133 select GENERIC_TIME_VSYSCALL
134 select GENERIC_VDSO_TIME_NS
135 select HAVE_ALIGNED_STRUCT_PAGE if SLUB
136 select HAVE_ARCH_AUDITSYSCALL
137 select HAVE_ARCH_JUMP_LABEL
138 select HAVE_ARCH_JUMP_LABEL_RELATIVE
139 select HAVE_ARCH_KASAN
140 select HAVE_ARCH_KASAN_VMALLOC
141 select HAVE_ARCH_RANDOMIZE_KSTACK_OFFSET
142 select HAVE_ARCH_SECCOMP_FILTER
143 select HAVE_ARCH_SOFT_DIRTY
144 select HAVE_ARCH_TRACEHOOK
145 select HAVE_ARCH_TRANSPARENT_HUGEPAGE
146 select HAVE_ARCH_VMAP_STACK
147 select HAVE_ASM_MODVERSIONS
148 select HAVE_CMPXCHG_DOUBLE
149 select HAVE_CMPXCHG_LOCAL
150 select HAVE_DEBUG_KMEMLEAK
151 select HAVE_DMA_CONTIGUOUS
152 select HAVE_DYNAMIC_FTRACE
153 select HAVE_DYNAMIC_FTRACE_WITH_REGS
154 select HAVE_EBPF_JIT if PACK_STACK && HAVE_MARCH_Z196_FEATURES
155 select HAVE_EFFICIENT_UNALIGNED_ACCESS
158 select HAVE_FTRACE_MCOUNT_RECORD
159 select HAVE_FUNCTION_ERROR_INJECTION
160 select HAVE_FUNCTION_GRAPH_TRACER
161 select HAVE_FUNCTION_TRACER
162 select HAVE_FUTEX_CMPXCHG if FUTEX
163 select HAVE_GCC_PLUGINS
164 select HAVE_GENERIC_VDSO
165 select HAVE_IOREMAP_PROT if PCI
166 select HAVE_KERNEL_BZIP2
167 select HAVE_KERNEL_GZIP
168 select HAVE_KERNEL_LZ4
169 select HAVE_KERNEL_LZMA
170 select HAVE_KERNEL_LZO
171 select HAVE_KERNEL_UNCOMPRESSED
172 select HAVE_KERNEL_XZ
173 select HAVE_KERNEL_ZSTD
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
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
440 depends on !CC_IS_CLANG
442 Select this option if you want to enable your system kernel to
443 handle system-calls from ELF binaries for 31 bit ESA. This option
444 (and some other stuff like libraries and such) is needed for
445 executing 31 bit applications. It is safe to say "Y".
447 config SYSVIPC_COMPAT
448 def_bool y if COMPAT && SYSVIPC
454 int "Maximum number of CPUs (2-512)"
458 This allows you to specify the maximum number of CPUs which this
459 kernel will support. The maximum supported value is 512 and the
460 minimum value which makes sense is 2.
462 This is purely to save memory - each supported CPU adds
463 approximately sixteen kilobytes to the kernel image.
470 depends on SCHED_TOPOLOGY
475 This option adds NUMA support to the kernel.
494 config SCHED_TOPOLOGY
496 prompt "Topology scheduler support"
502 Topology scheduler support improves the CPU scheduler's decision
503 making when dealing with machines that have multi-threading,
504 multiple cores or multiple books.
506 source "kernel/Kconfig.hz"
513 bool "kexec file based system call"
517 depends on CRYPTO_SHA256
518 depends on CRYPTO_SHA256_S390
520 Enable the kexec file based system call. In contrast to the normal
521 kexec system call this system call takes file descriptors for the
522 kernel and initramfs as arguments.
524 config ARCH_HAS_KEXEC_PURGATORY
526 depends on KEXEC_FILE
529 bool "Verify kernel signature during kexec_file_load() syscall"
530 depends on KEXEC_FILE && MODULE_SIG_FORMAT
532 This option makes kernel signature verification mandatory for
533 the kexec_file_load() syscall.
535 In addition to that option, you need to enable signature
536 verification for the corresponding kernel image type being
537 loaded in order for this to work.
541 prompt "s390 architectural random number generation API"
543 Enable the s390 architectural random number generation API
544 to provide random data for all consumers within the Linux
547 When enabled the arch_random_* functions declared in linux/random.h
548 are implemented. The implementation is based on the s390 CPACF
549 instruction subfunction TRNG which provides a real true random
556 prompt "Enable modified branch prediction for the kernel by default"
558 If this option is selected the kernel will switch to a modified
559 branch prediction mode if the firmware interface is available.
560 The modified branch prediction mode improves the behaviour in
561 regard to speculative execution.
563 With the option enabled the kernel parameter "nobp=0" or "nospec"
564 can be used to run the kernel in the normal branch prediction mode.
566 With the option disabled the modified branch prediction mode is
567 enabled with the "nobp=1" kernel parameter.
573 prompt "Avoid speculative indirect branches in the kernel"
575 Compile the kernel with the expoline compiler options to guard
576 against kernel-to-user data leaks by avoiding speculative indirect
578 Requires a compiler with -mindirect-branch=thunk support for full
579 protection. The kernel may run slower.
584 prompt "Expoline default"
586 default EXPOLINE_FULL
589 bool "spectre_v2=off"
592 bool "spectre_v2=auto"
600 bool "Build a relocatable kernel"
601 select MODULE_REL_CRCS if MODVERSIONS
604 This builds a kernel image that retains relocation information
605 so it can be loaded at an arbitrary address.
606 The kernel is linked as a position-independent executable (PIE)
607 and contains dynamic relocations which are processed early in the
609 The relocations make the kernel image about 15% larger (compressed
610 10%), but are discarded at runtime.
612 config RANDOMIZE_BASE
613 bool "Randomize the address of the kernel image (KASLR)"
614 depends on RELOCATABLE
617 In support of Kernel Address Space Layout Randomization (KASLR),
618 this randomizes the address at which the kernel image is loaded,
619 as a security feature that deters exploit attempts relying on
620 knowledge of the location of kernel internals.
626 config ARCH_SPARSEMEM_ENABLE
628 select SPARSEMEM_VMEMMAP_ENABLE
629 select SPARSEMEM_VMEMMAP
631 config ARCH_SPARSEMEM_DEFAULT
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 && 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"
857 depends on PROC_SYSCTL
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.