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_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_KCSAN
142 select HAVE_ARCH_KFENCE
143 select HAVE_ARCH_RANDOMIZE_KSTACK_OFFSET
144 select HAVE_ARCH_SECCOMP_FILTER
145 select HAVE_ARCH_SOFT_DIRTY
146 select HAVE_ARCH_TRACEHOOK
147 select HAVE_ARCH_TRANSPARENT_HUGEPAGE
148 select HAVE_ARCH_VMAP_STACK
149 select HAVE_ASM_MODVERSIONS
150 select HAVE_CMPXCHG_DOUBLE
151 select HAVE_CMPXCHG_LOCAL
152 select HAVE_DEBUG_KMEMLEAK
153 select HAVE_DMA_CONTIGUOUS
154 select HAVE_DYNAMIC_FTRACE
155 select HAVE_DYNAMIC_FTRACE_WITH_ARGS
156 select HAVE_DYNAMIC_FTRACE_WITH_DIRECT_CALLS
157 select HAVE_DYNAMIC_FTRACE_WITH_REGS
158 select HAVE_EBPF_JIT if PACK_STACK && HAVE_MARCH_Z196_FEATURES
159 select HAVE_EFFICIENT_UNALIGNED_ACCESS
162 select HAVE_FTRACE_MCOUNT_RECORD
163 select HAVE_FUNCTION_ARG_ACCESS_API
164 select HAVE_FUNCTION_ERROR_INJECTION
165 select HAVE_FUNCTION_GRAPH_TRACER
166 select HAVE_FUNCTION_TRACER
167 select HAVE_GCC_PLUGINS
168 select HAVE_GENERIC_VDSO
169 select HAVE_IOREMAP_PROT if PCI
170 select HAVE_KERNEL_BZIP2
171 select HAVE_KERNEL_GZIP
172 select HAVE_KERNEL_LZ4
173 select HAVE_KERNEL_LZMA
174 select HAVE_KERNEL_LZO
175 select HAVE_KERNEL_UNCOMPRESSED
176 select HAVE_KERNEL_XZ
177 select HAVE_KERNEL_ZSTD
179 select HAVE_KPROBES_ON_FTRACE
180 select HAVE_KRETPROBES
182 select HAVE_LIVEPATCH
183 select HAVE_MEMBLOCK_PHYS_MAP
184 select HAVE_MOD_ARCH_SPECIFIC
186 select HAVE_NOP_MCOUNT
188 select HAVE_PERF_EVENTS
189 select HAVE_PERF_REGS
190 select HAVE_PERF_USER_STACK_DUMP
191 select HAVE_REGS_AND_STACK_ACCESS_API
192 select HAVE_RELIABLE_STACKTRACE
194 select HAVE_SAMPLE_FTRACE_DIRECT
195 select HAVE_SAMPLE_FTRACE_DIRECT_MULTI
196 select HAVE_SOFTIRQ_ON_OWN_STACK
197 select HAVE_SYSCALL_TRACEPOINTS
198 select HAVE_VIRT_CPU_ACCOUNTING
199 select HAVE_VIRT_CPU_ACCOUNTING_IDLE
200 select IOMMU_HELPER if PCI
201 select IOMMU_SUPPORT if PCI
202 select MMU_GATHER_NO_GATHER
203 select MMU_GATHER_RCU_TABLE_FREE
204 select MODULES_USE_ELF_RELA
205 select NEED_DMA_MAP_STATE if PCI
206 select NEED_SG_DMA_LENGTH if PCI
208 select OLD_SIGSUSPEND3
209 select PCI_DOMAINS if PCI
210 select PCI_MSI if PCI
211 select PCI_MSI_ARCH_FALLBACKS if PCI_MSI
214 select SYSCTL_EXCEPTION_TRACE
215 select THREAD_INFO_IN_TASK
216 select TRACE_IRQFLAGS_SUPPORT
218 select VIRT_CPU_ACCOUNTING
220 # Note: keep the above list sorted alphabetically
222 config SCHED_OMIT_FRAME_POINTER
225 config PGTABLE_LEVELS
229 source "kernel/livepatch/Kconfig"
231 menu "Processor type and features"
233 config HAVE_MARCH_Z900_FEATURES
236 config HAVE_MARCH_Z990_FEATURES
238 select HAVE_MARCH_Z900_FEATURES
240 config HAVE_MARCH_Z9_109_FEATURES
242 select HAVE_MARCH_Z990_FEATURES
244 config HAVE_MARCH_Z10_FEATURES
246 select HAVE_MARCH_Z9_109_FEATURES
248 config HAVE_MARCH_Z196_FEATURES
250 select HAVE_MARCH_Z10_FEATURES
252 config HAVE_MARCH_ZEC12_FEATURES
254 select HAVE_MARCH_Z196_FEATURES
256 config HAVE_MARCH_Z13_FEATURES
258 select HAVE_MARCH_ZEC12_FEATURES
260 config HAVE_MARCH_Z14_FEATURES
262 select HAVE_MARCH_Z13_FEATURES
264 config HAVE_MARCH_Z15_FEATURES
266 select HAVE_MARCH_Z14_FEATURES
269 prompt "Processor type"
273 bool "IBM zSeries model z800 and z900"
274 select HAVE_MARCH_Z900_FEATURES
275 depends on $(cc-option,-march=z900)
277 Select this to enable optimizations for model z800/z900 (2064 and
278 2066 series). This will enable some optimizations that are not
279 available on older ESA/390 (31 Bit) only CPUs.
282 bool "IBM zSeries model z890 and z990"
283 select HAVE_MARCH_Z990_FEATURES
284 depends on $(cc-option,-march=z990)
286 Select this to enable optimizations for model z890/z990 (2084 and
287 2086 series). The kernel will be slightly faster but will not work
292 select HAVE_MARCH_Z9_109_FEATURES
293 depends on $(cc-option,-march=z9-109)
295 Select this to enable optimizations for IBM System z9 (2094 and
296 2096 series). The kernel will be slightly faster but will not work
300 bool "IBM System z10"
301 select HAVE_MARCH_Z10_FEATURES
302 depends on $(cc-option,-march=z10)
304 Select this to enable optimizations for IBM System z10 (2097 and
305 2098 series). The kernel will be slightly faster but will not work
309 bool "IBM zEnterprise 114 and 196"
310 select HAVE_MARCH_Z196_FEATURES
311 depends on $(cc-option,-march=z196)
313 Select this to enable optimizations for IBM zEnterprise 114 and 196
314 (2818 and 2817 series). The kernel will be slightly faster but will
315 not work on older machines.
318 bool "IBM zBC12 and zEC12"
319 select HAVE_MARCH_ZEC12_FEATURES
320 depends on $(cc-option,-march=zEC12)
322 Select this to enable optimizations for IBM zBC12 and zEC12 (2828 and
323 2827 series). The kernel will be slightly faster but will not work on
327 bool "IBM z13s and z13"
328 select HAVE_MARCH_Z13_FEATURES
329 depends on $(cc-option,-march=z13)
331 Select this to enable optimizations for IBM z13s and z13 (2965 and
332 2964 series). The kernel will be slightly faster but will not work on
336 bool "IBM z14 ZR1 and z14"
337 select HAVE_MARCH_Z14_FEATURES
338 depends on $(cc-option,-march=z14)
340 Select this to enable optimizations for IBM z14 ZR1 and z14 (3907
341 and 3906 series). The kernel will be slightly faster but will not
342 work on older machines.
346 select HAVE_MARCH_Z15_FEATURES
347 depends on $(cc-option,-march=z15)
349 Select this to enable optimizations for IBM z15 (8562
350 and 8561 series). The kernel will be slightly faster but will not
351 work on older machines.
355 config MARCH_Z900_TUNE
356 def_bool TUNE_Z900 || MARCH_Z900 && TUNE_DEFAULT
358 config MARCH_Z990_TUNE
359 def_bool TUNE_Z990 || MARCH_Z990 && TUNE_DEFAULT
361 config MARCH_Z9_109_TUNE
362 def_bool TUNE_Z9_109 || MARCH_Z9_109 && TUNE_DEFAULT
364 config MARCH_Z10_TUNE
365 def_bool TUNE_Z10 || MARCH_Z10 && TUNE_DEFAULT
367 config MARCH_Z196_TUNE
368 def_bool TUNE_Z196 || MARCH_Z196 && TUNE_DEFAULT
370 config MARCH_ZEC12_TUNE
371 def_bool TUNE_ZEC12 || MARCH_ZEC12 && TUNE_DEFAULT
373 config MARCH_Z13_TUNE
374 def_bool TUNE_Z13 || MARCH_Z13 && TUNE_DEFAULT
376 config MARCH_Z14_TUNE
377 def_bool TUNE_Z14 || MARCH_Z14 && TUNE_DEFAULT
379 config MARCH_Z15_TUNE
380 def_bool TUNE_Z15 || MARCH_Z15 && TUNE_DEFAULT
383 prompt "Tune code generation"
386 Cause the compiler to tune (-mtune) the generated code for a machine.
387 This will make the code run faster on the selected machine but
388 somewhat slower on other machines.
389 This option only changes how the compiler emits instructions, not the
390 selection of instructions itself, so the resulting kernel will run on
396 Tune the generated code for the target processor for which the kernel
400 bool "IBM zSeries model z800 and z900"
401 depends on $(cc-option,-mtune=z900)
404 bool "IBM zSeries model z890 and z990"
405 depends on $(cc-option,-mtune=z990)
409 depends on $(cc-option,-mtune=z9-109)
412 bool "IBM System z10"
413 depends on $(cc-option,-mtune=z10)
416 bool "IBM zEnterprise 114 and 196"
417 depends on $(cc-option,-mtune=z196)
420 bool "IBM zBC12 and zEC12"
421 depends on $(cc-option,-mtune=zEC12)
424 bool "IBM z13s and z13"
425 depends on $(cc-option,-mtune=z13)
428 bool "IBM z14 ZR1 and z14"
429 depends on $(cc-option,-mtune=z14)
433 depends on $(cc-option,-mtune=z15)
440 config COMMAND_LINE_SIZE
441 int "Maximum size of kernel command line"
445 This allows you to specify the maximum length of the kernel command
450 prompt "Kernel support for 31 bit emulation"
451 select ARCH_WANT_OLD_COMPAT_IPC
452 select COMPAT_OLD_SIGACTION
455 depends on !CC_IS_CLANG
457 Select this option if you want to enable your system kernel to
458 handle system-calls from ELF binaries for 31 bit ESA. This option
459 (and some other stuff like libraries and such) is needed for
460 executing 31 bit applications. It is safe to say "Y".
462 config SYSVIPC_COMPAT
463 def_bool y if COMPAT && SYSVIPC
469 int "Maximum number of CPUs (2-512)"
473 This allows you to specify the maximum number of CPUs which this
474 kernel will support. The maximum supported value is 512 and the
475 minimum value which makes sense is 2.
477 This is purely to save memory - each supported CPU adds
478 approximately sixteen kilobytes to the kernel image.
485 depends on SCHED_TOPOLOGY
490 This option adds NUMA support to the kernel.
509 config SCHED_TOPOLOGY
511 prompt "Topology scheduler support"
517 Topology scheduler support improves the CPU scheduler's decision
518 making when dealing with machines that have multi-threading,
519 multiple cores or multiple books.
521 source "kernel/Kconfig.hz"
528 bool "kexec file based system call"
532 depends on CRYPTO_SHA256
533 depends on CRYPTO_SHA256_S390
535 Enable the kexec file based system call. In contrast to the normal
536 kexec system call this system call takes file descriptors for the
537 kernel and initramfs as arguments.
539 config ARCH_HAS_KEXEC_PURGATORY
541 depends on KEXEC_FILE
544 bool "Verify kernel signature during kexec_file_load() syscall"
545 depends on KEXEC_FILE && MODULE_SIG_FORMAT
547 This option makes kernel signature verification mandatory for
548 the kexec_file_load() syscall.
550 In addition to that option, you need to enable signature
551 verification for the corresponding kernel image type being
552 loaded in order for this to work.
556 prompt "s390 architectural random number generation API"
558 Enable the s390 architectural random number generation API
559 to provide random data for all consumers within the Linux
562 When enabled the arch_random_* functions declared in linux/random.h
563 are implemented. The implementation is based on the s390 CPACF
564 instruction subfunction TRNG which provides a real true random
571 prompt "Enable modified branch prediction for the kernel by default"
573 If this option is selected the kernel will switch to a modified
574 branch prediction mode if the firmware interface is available.
575 The modified branch prediction mode improves the behaviour in
576 regard to speculative execution.
578 With the option enabled the kernel parameter "nobp=0" or "nospec"
579 can be used to run the kernel in the normal branch prediction mode.
581 With the option disabled the modified branch prediction mode is
582 enabled with the "nobp=1" kernel parameter.
588 prompt "Avoid speculative indirect branches in the kernel"
590 Compile the kernel with the expoline compiler options to guard
591 against kernel-to-user data leaks by avoiding speculative indirect
593 Requires a compiler with -mindirect-branch=thunk support for full
594 protection. The kernel may run slower.
599 prompt "Expoline default"
601 default EXPOLINE_FULL
604 bool "spectre_v2=off"
607 bool "spectre_v2=auto"
615 bool "Build a relocatable kernel"
616 select MODULE_REL_CRCS if MODVERSIONS
619 This builds a kernel image that retains relocation information
620 so it can be loaded at an arbitrary address.
621 The kernel is linked as a position-independent executable (PIE)
622 and contains dynamic relocations which are processed early in the
624 The relocations make the kernel image about 15% larger (compressed
625 10%), but are discarded at runtime.
627 config RANDOMIZE_BASE
628 bool "Randomize the address of the kernel image (KASLR)"
629 depends on RELOCATABLE
632 In support of Kernel Address Space Layout Randomization (KASLR),
633 this randomizes the address at which the kernel image is loaded,
634 as a security feature that deters exploit attempts relying on
635 knowledge of the location of kernel internals.
641 config ARCH_SPARSEMEM_ENABLE
643 select SPARSEMEM_VMEMMAP_ENABLE
644 select SPARSEMEM_VMEMMAP
646 config ARCH_SPARSEMEM_DEFAULT
649 config MAX_PHYSMEM_BITS
650 int "Maximum size of supported physical memory in bits (42-53)"
654 This option specifies the maximum supported size of physical memory
655 in bits. Supported is any size between 2^42 (4TB) and 2^53 (8PB).
656 Increasing the number of bits also increases the kernel image size.
657 By default 46 bits (64TB) are supported.
661 prompt "Pack kernel stack"
663 This option enables the compiler option -mkernel-backchain if it
664 is available. If the option is available the compiler supports
665 the new stack layout which dramatically reduces the minimum stack
666 frame size. With an old compiler a non-leaf function needs a
667 minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
668 -mkernel-backchain the minimum size drops to 16 byte on 31 bit
669 and 24 byte on 64 bit.
671 Say Y if you are unsure.
675 depends on !VMAP_STACK
676 prompt "Detect kernel stack overflow"
678 This option enables the compiler option -mstack-guard and
679 -mstack-size if they are available. If the compiler supports them
680 it will emit additional code to each function prolog to trigger
681 an illegal operation if the kernel stack is about to overflow.
683 Say N if you are unsure.
686 int "Size of the guard area (128-1024)"
688 depends on CHECK_STACK
691 This allows you to specify the size of the guard area at the lower
692 end of the kernel stack. If the kernel stack points into the guard
693 area on function entry an illegal operation is triggered. The size
694 needs to be a power of 2. Please keep in mind that the size of an
695 interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
696 The minimum size for the stack guard should be 256 for 31 bit and
705 prompt "QDIO support"
707 This driver provides the Queued Direct I/O base support for
710 To compile this driver as a module, choose M here: the
711 module will be called qdio.
717 config PCI_NR_FUNCTIONS
718 int "Maximum number of PCI functions (1-4096)"
722 This allows you to specify the maximum number of PCI functions which
723 this kernel will support.
732 prompt "Support for CHSC subchannels"
734 This driver allows usage of CHSC subchannels. A CHSC subchannel
735 is usually present on LPAR only.
736 The driver creates a device /dev/chsc, which may be used to
737 obtain I/O configuration information about the machine and
738 to issue asynchronous chsc commands (DANGEROUS).
739 You will usually only want to use this interface on a special
740 LPAR designated for system management.
742 To compile this driver as a module, choose M here: the
743 module will be called chsc_sch.
749 prompt "SCM bus driver"
751 Bus driver for Storage Class Memory.
755 prompt "Support for EADM subchannels"
758 This driver allows usage of EADM subchannels. EADM subchannels act
759 as a communication vehicle for SCM increments.
761 To compile this driver as a module, choose M here: the
762 module will be called eadm_sch.
766 prompt "Support for VFIO-CCW subchannels"
767 depends on S390_CCW_IOMMU && VFIO_MDEV
769 This driver allows usage of I/O subchannels via VFIO-CCW.
771 To compile this driver as a module, choose M here: the
772 module will be called vfio_ccw.
776 prompt "VFIO support for AP devices"
777 depends on S390_AP_IOMMU && VFIO_MDEV && KVM
780 This driver grants access to Adjunct Processor (AP) devices
781 via the VFIO mediated device interface.
783 To compile this driver as a module, choose M here: the module
784 will be called vfio_ap.
791 bool "kernel crash dumps"
794 Generate crash dump after being started by kexec.
795 Crash dump kernels are loaded in the main kernel with kexec-tools
796 into a specially reserved region and then later executed after
797 a crash by kdump/kexec.
798 Refer to <file:Documentation/s390/zfcpdump.rst> for more details on this.
799 This option also enables s390 zfcpdump.
800 See also <file:Documentation/s390/zfcpdump.rst>
809 default (SMC || CCWGROUP)
811 menu "Virtualization"
813 config PROTECTED_VIRTUALIZATION_GUEST
815 prompt "Protected virtualization guest support"
816 select ARCH_HAS_RESTRICTED_VIRTIO_MEMORY_ACCESS
818 Select this option, if you want to be able to run this
819 kernel as a protected virtualization KVM guest.
820 Protected virtualization capable machines have a mini hypervisor
821 located at machine level (an ultravisor). With help of the
822 Ultravisor, KVM will be able to run "protected" VMs, special
823 VMs whose memory and management data are unavailable to KVM.
827 prompt "Pseudo page fault support"
829 Select this option, if you want to use PFAULT pseudo page fault
830 handling under VM. If running native or in LPAR, this option
831 has no effect. If your VM does not support PFAULT, PAGEEX
832 pseudo page fault handling will be used.
833 Note that VM 4.2 supports PFAULT but has a bug in its
834 implementation that causes some problems.
835 Everybody who wants to run Linux under VM != VM4.2 should select
840 prompt "Cooperative memory management"
842 Select this option, if you want to enable the kernel interface
843 to reduce the memory size of the system. This is accomplished
844 by allocating pages of memory and put them "on hold". This only
845 makes sense for a system running under VM where the unused pages
846 will be reused by VM for other guest systems. The interface
847 allows an external monitor to balance memory of many systems.
848 Everybody who wants to run Linux under VM should select this
853 prompt "IUCV special message interface to cooperative memory management"
854 depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
856 Select this option to enable the special message interface to
857 the cooperative memory management.
861 prompt "Linux - VM Monitor Stream, base infrastructure"
862 depends on PROC_SYSCTL
864 This provides a kernel interface for creating and updating z/VM APPLDATA
865 monitor records. The monitor records are updated at certain time
866 intervals, once the timer is started.
867 Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
868 i.e. enables or disables monitoring on the Linux side.
869 A custom interval value (in seconds) can be written to
870 /proc/appldata/interval.
872 Defaults are 60 seconds interval and timer off.
873 The /proc entries can also be read from, showing the current settings.
877 prompt "Monitor memory management statistics"
878 depends on APPLDATA_BASE && VM_EVENT_COUNTERS
880 This provides memory management related data to the Linux - VM Monitor
881 Stream, like paging/swapping rate, memory utilisation, etc.
882 Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
883 APPLDATA monitor record, i.e. enables or disables monitoring this record
887 The /proc entry can also be read from, showing the current settings.
889 This can also be compiled as a module, which will be called
894 prompt "Monitor OS statistics"
895 depends on APPLDATA_BASE
897 This provides OS related data to the Linux - VM Monitor Stream, like
898 CPU utilisation, etc.
899 Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
900 APPLDATA monitor record, i.e. enables or disables monitoring this record
904 This can also be compiled as a module, which will be called
907 config APPLDATA_NET_SUM
909 prompt "Monitor overall network statistics"
910 depends on APPLDATA_BASE && NET
912 This provides network related data to the Linux - VM Monitor Stream,
913 currently there is only a total sum of network I/O statistics, no
915 Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
916 APPLDATA monitor record, i.e. enables or disables monitoring this record
920 This can also be compiled as a module, which will be called
925 prompt "s390 hypervisor file system support"
926 select SYS_HYPERVISOR
928 This is a virtual file system intended to provide accounting
929 information in an s390 hypervisor environment.
931 source "arch/s390/kvm/Kconfig"
935 prompt "s390 support for virtio devices"
937 select VIRTUALIZATION
940 Enabling this option adds support for virtio based paravirtual device
943 Select this option if you want to run the kernel as a guest under
948 config S390_MODULES_SANITY_TEST_HELPERS
953 config S390_UNWIND_SELFTEST
956 default KUNIT_ALL_TESTS
957 prompt "Test unwind functions"
959 This option enables s390 specific stack unwinder testing kernel
960 module. This option is not useful for distributions or general
961 kernels, but only for kernel developers working on architecture code.
963 Say N if you are unsure.
965 config S390_KPROBES_SANITY_TEST
967 prompt "Enable s390 specific kprobes tests"
971 This option enables an s390 specific kprobes test module. This option
972 is not useful for distributions or general kernels, but only for kernel
973 developers working on architecture code.
975 Say N if you are unsure.
977 config S390_MODULES_SANITY_TEST
980 default KUNIT_ALL_TESTS
981 prompt "Enable s390 specific modules tests"
982 select S390_MODULES_SANITY_TEST_HELPERS
984 This option enables an s390 specific modules test. This option is
985 not useful for distributions or general kernels, but only for
986 kernel developers working on architecture code.
988 Say N if you are unsure.