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 0x1C000000000000
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_HUGETLBFS
114 select ARCH_SUPPORTS_NUMA_BALANCING
115 select ARCH_USE_BUILTIN_BSWAP
116 select ARCH_USE_CMPXCHG_LOCKREF
117 select ARCH_WANTS_DYNAMIC_TASK_STRUCT
118 select ARCH_WANTS_NO_INSTR
119 select ARCH_WANT_DEFAULT_BPF_JIT
120 select ARCH_WANT_IPC_PARSE_VERSION
121 select BUILDTIME_TABLE_SORT
122 select CLONE_BACKWARDS2
123 select CPU_NO_EFFICIENT_FFS if !HAVE_MARCH_Z9_109_FEATURES
124 select DMA_OPS if PCI
125 select DYNAMIC_FTRACE if FUNCTION_TRACER
126 select GENERIC_ALLOCATOR
127 select GENERIC_CPU_AUTOPROBE
128 select GENERIC_CPU_VULNERABILITIES
130 select GENERIC_FIND_FIRST_BIT
131 select GENERIC_GETTIMEOFDAY
132 select GENERIC_PTDUMP
133 select GENERIC_SMP_IDLE_THREAD
134 select GENERIC_TIME_VSYSCALL
135 select GENERIC_VDSO_TIME_NS
136 select HAVE_ALIGNED_STRUCT_PAGE if SLUB
137 select HAVE_ARCH_AUDITSYSCALL
138 select HAVE_ARCH_JUMP_LABEL
139 select HAVE_ARCH_JUMP_LABEL_RELATIVE
140 select HAVE_ARCH_KASAN
141 select HAVE_ARCH_KASAN_VMALLOC
142 select HAVE_ARCH_KCSAN
143 select HAVE_ARCH_KFENCE
144 select HAVE_ARCH_RANDOMIZE_KSTACK_OFFSET
145 select HAVE_ARCH_SECCOMP_FILTER
146 select HAVE_ARCH_SOFT_DIRTY
147 select HAVE_ARCH_TRACEHOOK
148 select HAVE_ARCH_TRANSPARENT_HUGEPAGE
149 select HAVE_ARCH_VMAP_STACK
150 select HAVE_ASM_MODVERSIONS
151 select HAVE_CMPXCHG_DOUBLE
152 select HAVE_CMPXCHG_LOCAL
153 select HAVE_DEBUG_KMEMLEAK
154 select HAVE_DMA_CONTIGUOUS
155 select HAVE_DYNAMIC_FTRACE
156 select HAVE_DYNAMIC_FTRACE_WITH_ARGS
157 select HAVE_DYNAMIC_FTRACE_WITH_DIRECT_CALLS
158 select HAVE_DYNAMIC_FTRACE_WITH_REGS
159 select HAVE_EBPF_JIT if PACK_STACK && HAVE_MARCH_Z196_FEATURES
160 select HAVE_EFFICIENT_UNALIGNED_ACCESS
163 select HAVE_FTRACE_MCOUNT_RECORD
164 select HAVE_FUNCTION_ARG_ACCESS_API
165 select HAVE_FUNCTION_ERROR_INJECTION
166 select HAVE_FUNCTION_GRAPH_TRACER
167 select HAVE_FUNCTION_TRACER
168 select HAVE_FUTEX_CMPXCHG if FUTEX
169 select HAVE_GCC_PLUGINS
170 select HAVE_GENERIC_VDSO
171 select HAVE_IOREMAP_PROT if PCI
172 select HAVE_KERNEL_BZIP2
173 select HAVE_KERNEL_GZIP
174 select HAVE_KERNEL_LZ4
175 select HAVE_KERNEL_LZMA
176 select HAVE_KERNEL_LZO
177 select HAVE_KERNEL_UNCOMPRESSED
178 select HAVE_KERNEL_XZ
179 select HAVE_KERNEL_ZSTD
181 select HAVE_KPROBES_ON_FTRACE
182 select HAVE_KRETPROBES
184 select HAVE_LIVEPATCH
185 select HAVE_MEMBLOCK_PHYS_MAP
186 select HAVE_MOD_ARCH_SPECIFIC
188 select HAVE_NOP_MCOUNT
190 select HAVE_PERF_EVENTS
191 select HAVE_PERF_REGS
192 select HAVE_PERF_USER_STACK_DUMP
193 select HAVE_REGS_AND_STACK_ACCESS_API
194 select HAVE_RELIABLE_STACKTRACE
196 select HAVE_SAMPLE_FTRACE_DIRECT
197 select HAVE_SOFTIRQ_ON_OWN_STACK
198 select HAVE_SYSCALL_TRACEPOINTS
199 select HAVE_VIRT_CPU_ACCOUNTING
200 select HAVE_VIRT_CPU_ACCOUNTING_IDLE
201 select IOMMU_HELPER if PCI
202 select IOMMU_SUPPORT if PCI
203 select MMU_GATHER_NO_GATHER
204 select MMU_GATHER_RCU_TABLE_FREE
205 select MODULES_USE_ELF_RELA
206 select NEED_DMA_MAP_STATE if PCI
207 select NEED_SG_DMA_LENGTH if PCI
209 select OLD_SIGSUSPEND3
210 select PCI_DOMAINS if PCI
211 select PCI_MSI if PCI
212 select PCI_MSI_ARCH_FALLBACKS if PCI_MSI
215 select SYSCTL_EXCEPTION_TRACE
216 select THREAD_INFO_IN_TASK
217 select TRACE_IRQFLAGS_SUPPORT
219 select VIRT_CPU_ACCOUNTING
221 # Note: keep the above list sorted alphabetically
223 config SCHED_OMIT_FRAME_POINTER
226 config PGTABLE_LEVELS
230 source "kernel/livepatch/Kconfig"
232 menu "Processor type and features"
234 config HAVE_MARCH_Z900_FEATURES
237 config HAVE_MARCH_Z990_FEATURES
239 select HAVE_MARCH_Z900_FEATURES
241 config HAVE_MARCH_Z9_109_FEATURES
243 select HAVE_MARCH_Z990_FEATURES
245 config HAVE_MARCH_Z10_FEATURES
247 select HAVE_MARCH_Z9_109_FEATURES
249 config HAVE_MARCH_Z196_FEATURES
251 select HAVE_MARCH_Z10_FEATURES
253 config HAVE_MARCH_ZEC12_FEATURES
255 select HAVE_MARCH_Z196_FEATURES
257 config HAVE_MARCH_Z13_FEATURES
259 select HAVE_MARCH_ZEC12_FEATURES
261 config HAVE_MARCH_Z14_FEATURES
263 select HAVE_MARCH_Z13_FEATURES
265 config HAVE_MARCH_Z15_FEATURES
267 select HAVE_MARCH_Z14_FEATURES
270 prompt "Processor type"
274 bool "IBM zSeries model z800 and z900"
275 select HAVE_MARCH_Z900_FEATURES
276 depends on $(cc-option,-march=z900)
278 Select this to enable optimizations for model z800/z900 (2064 and
279 2066 series). This will enable some optimizations that are not
280 available on older ESA/390 (31 Bit) only CPUs.
283 bool "IBM zSeries model z890 and z990"
284 select HAVE_MARCH_Z990_FEATURES
285 depends on $(cc-option,-march=z990)
287 Select this to enable optimizations for model z890/z990 (2084 and
288 2086 series). The kernel will be slightly faster but will not work
293 select HAVE_MARCH_Z9_109_FEATURES
294 depends on $(cc-option,-march=z9-109)
296 Select this to enable optimizations for IBM System z9 (2094 and
297 2096 series). The kernel will be slightly faster but will not work
301 bool "IBM System z10"
302 select HAVE_MARCH_Z10_FEATURES
303 depends on $(cc-option,-march=z10)
305 Select this to enable optimizations for IBM System z10 (2097 and
306 2098 series). The kernel will be slightly faster but will not work
310 bool "IBM zEnterprise 114 and 196"
311 select HAVE_MARCH_Z196_FEATURES
312 depends on $(cc-option,-march=z196)
314 Select this to enable optimizations for IBM zEnterprise 114 and 196
315 (2818 and 2817 series). The kernel will be slightly faster but will
316 not work on older machines.
319 bool "IBM zBC12 and zEC12"
320 select HAVE_MARCH_ZEC12_FEATURES
321 depends on $(cc-option,-march=zEC12)
323 Select this to enable optimizations for IBM zBC12 and zEC12 (2828 and
324 2827 series). The kernel will be slightly faster but will not work on
328 bool "IBM z13s and z13"
329 select HAVE_MARCH_Z13_FEATURES
330 depends on $(cc-option,-march=z13)
332 Select this to enable optimizations for IBM z13s and z13 (2965 and
333 2964 series). The kernel will be slightly faster but will not work on
337 bool "IBM z14 ZR1 and z14"
338 select HAVE_MARCH_Z14_FEATURES
339 depends on $(cc-option,-march=z14)
341 Select this to enable optimizations for IBM z14 ZR1 and z14 (3907
342 and 3906 series). The kernel will be slightly faster but will not
343 work on older machines.
347 select HAVE_MARCH_Z15_FEATURES
348 depends on $(cc-option,-march=z15)
350 Select this to enable optimizations for IBM z15 (8562
351 and 8561 series). The kernel will be slightly faster but will not
352 work on older machines.
356 config MARCH_Z900_TUNE
357 def_bool TUNE_Z900 || MARCH_Z900 && TUNE_DEFAULT
359 config MARCH_Z990_TUNE
360 def_bool TUNE_Z990 || MARCH_Z990 && TUNE_DEFAULT
362 config MARCH_Z9_109_TUNE
363 def_bool TUNE_Z9_109 || MARCH_Z9_109 && TUNE_DEFAULT
365 config MARCH_Z10_TUNE
366 def_bool TUNE_Z10 || MARCH_Z10 && TUNE_DEFAULT
368 config MARCH_Z196_TUNE
369 def_bool TUNE_Z196 || MARCH_Z196 && TUNE_DEFAULT
371 config MARCH_ZEC12_TUNE
372 def_bool TUNE_ZEC12 || MARCH_ZEC12 && TUNE_DEFAULT
374 config MARCH_Z13_TUNE
375 def_bool TUNE_Z13 || MARCH_Z13 && TUNE_DEFAULT
377 config MARCH_Z14_TUNE
378 def_bool TUNE_Z14 || MARCH_Z14 && TUNE_DEFAULT
380 config MARCH_Z15_TUNE
381 def_bool TUNE_Z15 || MARCH_Z15 && TUNE_DEFAULT
384 prompt "Tune code generation"
387 Cause the compiler to tune (-mtune) the generated code for a machine.
388 This will make the code run faster on the selected machine but
389 somewhat slower on other machines.
390 This option only changes how the compiler emits instructions, not the
391 selection of instructions itself, so the resulting kernel will run on
397 Tune the generated code for the target processor for which the kernel
401 bool "IBM zSeries model z800 and z900"
402 depends on $(cc-option,-mtune=z900)
405 bool "IBM zSeries model z890 and z990"
406 depends on $(cc-option,-mtune=z990)
410 depends on $(cc-option,-mtune=z9-109)
413 bool "IBM System z10"
414 depends on $(cc-option,-mtune=z10)
417 bool "IBM zEnterprise 114 and 196"
418 depends on $(cc-option,-mtune=z196)
421 bool "IBM zBC12 and zEC12"
422 depends on $(cc-option,-mtune=zEC12)
425 bool "IBM z13s and z13"
426 depends on $(cc-option,-mtune=z13)
429 bool "IBM z14 ZR1 and z14"
430 depends on $(cc-option,-mtune=z14)
434 depends on $(cc-option,-mtune=z15)
441 config COMMAND_LINE_SIZE
442 int "Maximum size of kernel command line"
446 This allows you to specify the maximum length of the kernel command
451 prompt "Kernel support for 31 bit emulation"
452 select ARCH_WANT_OLD_COMPAT_IPC
453 select COMPAT_OLD_SIGACTION
456 depends on !CC_IS_CLANG
458 Select this option if you want to enable your system kernel to
459 handle system-calls from ELF binaries for 31 bit ESA. This option
460 (and some other stuff like libraries and such) is needed for
461 executing 31 bit applications. It is safe to say "Y".
463 config SYSVIPC_COMPAT
464 def_bool y if COMPAT && SYSVIPC
470 int "Maximum number of CPUs (2-512)"
474 This allows you to specify the maximum number of CPUs which this
475 kernel will support. The maximum supported value is 512 and the
476 minimum value which makes sense is 2.
478 This is purely to save memory - each supported CPU adds
479 approximately sixteen kilobytes to the kernel image.
486 depends on SCHED_TOPOLOGY
491 This option adds NUMA support to the kernel.
510 config SCHED_TOPOLOGY
512 prompt "Topology scheduler support"
518 Topology scheduler support improves the CPU scheduler's decision
519 making when dealing with machines that have multi-threading,
520 multiple cores or multiple books.
522 source "kernel/Kconfig.hz"
529 bool "kexec file based system call"
533 depends on CRYPTO_SHA256
534 depends on CRYPTO_SHA256_S390
536 Enable the kexec file based system call. In contrast to the normal
537 kexec system call this system call takes file descriptors for the
538 kernel and initramfs as arguments.
540 config ARCH_HAS_KEXEC_PURGATORY
542 depends on KEXEC_FILE
545 bool "Verify kernel signature during kexec_file_load() syscall"
546 depends on KEXEC_FILE && MODULE_SIG_FORMAT
548 This option makes kernel signature verification mandatory for
549 the kexec_file_load() syscall.
551 In addition to that option, you need to enable signature
552 verification for the corresponding kernel image type being
553 loaded in order for this to work.
557 prompt "s390 architectural random number generation API"
559 Enable the s390 architectural random number generation API
560 to provide random data for all consumers within the Linux
563 When enabled the arch_random_* functions declared in linux/random.h
564 are implemented. The implementation is based on the s390 CPACF
565 instruction subfunction TRNG which provides a real true random
572 prompt "Enable modified branch prediction for the kernel by default"
574 If this option is selected the kernel will switch to a modified
575 branch prediction mode if the firmware interface is available.
576 The modified branch prediction mode improves the behaviour in
577 regard to speculative execution.
579 With the option enabled the kernel parameter "nobp=0" or "nospec"
580 can be used to run the kernel in the normal branch prediction mode.
582 With the option disabled the modified branch prediction mode is
583 enabled with the "nobp=1" kernel parameter.
589 prompt "Avoid speculative indirect branches in the kernel"
591 Compile the kernel with the expoline compiler options to guard
592 against kernel-to-user data leaks by avoiding speculative indirect
594 Requires a compiler with -mindirect-branch=thunk support for full
595 protection. The kernel may run slower.
600 prompt "Expoline default"
602 default EXPOLINE_FULL
605 bool "spectre_v2=off"
608 bool "spectre_v2=auto"
616 bool "Build a relocatable kernel"
617 select MODULE_REL_CRCS if MODVERSIONS
620 This builds a kernel image that retains relocation information
621 so it can be loaded at an arbitrary address.
622 The kernel is linked as a position-independent executable (PIE)
623 and contains dynamic relocations which are processed early in the
625 The relocations make the kernel image about 15% larger (compressed
626 10%), but are discarded at runtime.
628 config RANDOMIZE_BASE
629 bool "Randomize the address of the kernel image (KASLR)"
630 depends on RELOCATABLE
633 In support of Kernel Address Space Layout Randomization (KASLR),
634 this randomizes the address at which the kernel image is loaded,
635 as a security feature that deters exploit attempts relying on
636 knowledge of the location of kernel internals.
642 config ARCH_SPARSEMEM_ENABLE
644 select SPARSEMEM_VMEMMAP_ENABLE
645 select SPARSEMEM_VMEMMAP
647 config ARCH_SPARSEMEM_DEFAULT
650 config MAX_PHYSMEM_BITS
651 int "Maximum size of supported physical memory in bits (42-53)"
655 This option specifies the maximum supported size of physical memory
656 in bits. Supported is any size between 2^42 (4TB) and 2^53 (8PB).
657 Increasing the number of bits also increases the kernel image size.
658 By default 46 bits (64TB) are supported.
662 prompt "Pack kernel stack"
664 This option enables the compiler option -mkernel-backchain if it
665 is available. If the option is available the compiler supports
666 the new stack layout which dramatically reduces the minimum stack
667 frame size. With an old compiler a non-leaf function needs a
668 minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
669 -mkernel-backchain the minimum size drops to 16 byte on 31 bit
670 and 24 byte on 64 bit.
672 Say Y if you are unsure.
676 depends on !VMAP_STACK
677 prompt "Detect kernel stack overflow"
679 This option enables the compiler option -mstack-guard and
680 -mstack-size if they are available. If the compiler supports them
681 it will emit additional code to each function prolog to trigger
682 an illegal operation if the kernel stack is about to overflow.
684 Say N if you are unsure.
687 int "Size of the guard area (128-1024)"
689 depends on CHECK_STACK
692 This allows you to specify the size of the guard area at the lower
693 end of the kernel stack. If the kernel stack points into the guard
694 area on function entry an illegal operation is triggered. The size
695 needs to be a power of 2. Please keep in mind that the size of an
696 interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
697 The minimum size for the stack guard should be 256 for 31 bit and
706 prompt "QDIO support"
708 This driver provides the Queued Direct I/O base support for
711 To compile this driver as a module, choose M here: the
712 module will be called qdio.
718 config PCI_NR_FUNCTIONS
719 int "Maximum number of PCI functions (1-4096)"
723 This allows you to specify the maximum number of PCI functions which
724 this kernel will support.
733 prompt "Support for CHSC subchannels"
735 This driver allows usage of CHSC subchannels. A CHSC subchannel
736 is usually present on LPAR only.
737 The driver creates a device /dev/chsc, which may be used to
738 obtain I/O configuration information about the machine and
739 to issue asynchronous chsc commands (DANGEROUS).
740 You will usually only want to use this interface on a special
741 LPAR designated for system management.
743 To compile this driver as a module, choose M here: the
744 module will be called chsc_sch.
750 prompt "SCM bus driver"
752 Bus driver for Storage Class Memory.
756 prompt "Support for EADM subchannels"
759 This driver allows usage of EADM subchannels. EADM subchannels act
760 as a communication vehicle for SCM increments.
762 To compile this driver as a module, choose M here: the
763 module will be called eadm_sch.
767 prompt "Support for VFIO-CCW subchannels"
768 depends on S390_CCW_IOMMU && VFIO_MDEV
770 This driver allows usage of I/O subchannels via VFIO-CCW.
772 To compile this driver as a module, choose M here: the
773 module will be called vfio_ccw.
777 prompt "VFIO support for AP devices"
778 depends on S390_AP_IOMMU && VFIO_MDEV && KVM
781 This driver grants access to Adjunct Processor (AP) devices
782 via the VFIO mediated device interface.
784 To compile this driver as a module, choose M here: the module
785 will be called vfio_ap.
792 bool "kernel crash dumps"
795 Generate crash dump after being started by kexec.
796 Crash dump kernels are loaded in the main kernel with kexec-tools
797 into a specially reserved region and then later executed after
798 a crash by kdump/kexec.
799 Refer to <file:Documentation/s390/zfcpdump.rst> for more details on this.
800 This option also enables s390 zfcpdump.
801 See also <file:Documentation/s390/zfcpdump.rst>
810 default (SMC || CCWGROUP)
812 menu "Virtualization"
814 config PROTECTED_VIRTUALIZATION_GUEST
816 prompt "Protected virtualization guest support"
817 select ARCH_HAS_RESTRICTED_VIRTIO_MEMORY_ACCESS
819 Select this option, if you want to be able to run this
820 kernel as a protected virtualization KVM guest.
821 Protected virtualization capable machines have a mini hypervisor
822 located at machine level (an ultravisor). With help of the
823 Ultravisor, KVM will be able to run "protected" VMs, special
824 VMs whose memory and management data are unavailable to KVM.
828 prompt "Pseudo page fault support"
830 Select this option, if you want to use PFAULT pseudo page fault
831 handling under VM. If running native or in LPAR, this option
832 has no effect. If your VM does not support PFAULT, PAGEEX
833 pseudo page fault handling will be used.
834 Note that VM 4.2 supports PFAULT but has a bug in its
835 implementation that causes some problems.
836 Everybody who wants to run Linux under VM != VM4.2 should select
841 prompt "Cooperative memory management"
843 Select this option, if you want to enable the kernel interface
844 to reduce the memory size of the system. This is accomplished
845 by allocating pages of memory and put them "on hold". This only
846 makes sense for a system running under VM where the unused pages
847 will be reused by VM for other guest systems. The interface
848 allows an external monitor to balance memory of many systems.
849 Everybody who wants to run Linux under VM should select this
854 prompt "IUCV special message interface to cooperative memory management"
855 depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
857 Select this option to enable the special message interface to
858 the cooperative memory management.
862 prompt "Linux - VM Monitor Stream, base infrastructure"
863 depends on PROC_SYSCTL
865 This provides a kernel interface for creating and updating z/VM APPLDATA
866 monitor records. The monitor records are updated at certain time
867 intervals, once the timer is started.
868 Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
869 i.e. enables or disables monitoring on the Linux side.
870 A custom interval value (in seconds) can be written to
871 /proc/appldata/interval.
873 Defaults are 60 seconds interval and timer off.
874 The /proc entries can also be read from, showing the current settings.
878 prompt "Monitor memory management statistics"
879 depends on APPLDATA_BASE && VM_EVENT_COUNTERS
881 This provides memory management related data to the Linux - VM Monitor
882 Stream, like paging/swapping rate, memory utilisation, etc.
883 Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
884 APPLDATA monitor record, i.e. enables or disables monitoring this record
888 The /proc entry can also be read from, showing the current settings.
890 This can also be compiled as a module, which will be called
895 prompt "Monitor OS statistics"
896 depends on APPLDATA_BASE
898 This provides OS related data to the Linux - VM Monitor Stream, like
899 CPU utilisation, etc.
900 Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
901 APPLDATA monitor record, i.e. enables or disables monitoring this record
905 This can also be compiled as a module, which will be called
908 config APPLDATA_NET_SUM
910 prompt "Monitor overall network statistics"
911 depends on APPLDATA_BASE && NET
913 This provides network related data to the Linux - VM Monitor Stream,
914 currently there is only a total sum of network I/O statistics, no
916 Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
917 APPLDATA monitor record, i.e. enables or disables monitoring this record
921 This can also be compiled as a module, which will be called
926 prompt "s390 hypervisor file system support"
927 select SYS_HYPERVISOR
929 This is a virtual file system intended to provide accounting
930 information in an s390 hypervisor environment.
932 source "arch/s390/kvm/Kconfig"
936 prompt "s390 support for virtio devices"
938 select VIRTUALIZATION
941 Enabling this option adds support for virtio based paravirtual device
944 Select this option if you want to run the kernel as a guest under
951 config S390_UNWIND_SELFTEST
954 default KUNIT_ALL_TESTS
955 prompt "Test unwind functions"
957 This option enables s390 specific stack unwinder testing kernel
958 module. This option is not useful for distributions or general
959 kernels, but only for kernel developers working on architecture code.
961 Say N if you are unsure.
963 config S390_KPROBES_SANITY_TEST
965 prompt "Enable s390 specific kprobes tests"
969 This option enables an s390 specific kprobes test module. This option
970 is not useful for distributions or general kernels, but only for kernel
971 developers working on architecture code.
973 Say N if you are unsure.