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_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_REGS
156 select HAVE_EBPF_JIT if PACK_STACK && HAVE_MARCH_Z196_FEATURES
157 select HAVE_EFFICIENT_UNALIGNED_ACCESS
160 select HAVE_FTRACE_MCOUNT_RECORD
161 select HAVE_FUNCTION_ERROR_INJECTION
162 select HAVE_FUNCTION_GRAPH_TRACER
163 select HAVE_FUNCTION_TRACER
164 select HAVE_FUTEX_CMPXCHG if FUTEX
165 select HAVE_GCC_PLUGINS
166 select HAVE_GENERIC_VDSO
167 select HAVE_IOREMAP_PROT if PCI
168 select HAVE_KERNEL_BZIP2
169 select HAVE_KERNEL_GZIP
170 select HAVE_KERNEL_LZ4
171 select HAVE_KERNEL_LZMA
172 select HAVE_KERNEL_LZO
173 select HAVE_KERNEL_UNCOMPRESSED
174 select HAVE_KERNEL_XZ
175 select HAVE_KERNEL_ZSTD
177 select HAVE_KPROBES_ON_FTRACE
178 select HAVE_KRETPROBES
180 select HAVE_LIVEPATCH
181 select HAVE_MEMBLOCK_PHYS_MAP
182 select HAVE_MOD_ARCH_SPECIFIC
184 select HAVE_NOP_MCOUNT
186 select HAVE_PERF_EVENTS
187 select HAVE_PERF_REGS
188 select HAVE_PERF_USER_STACK_DUMP
189 select HAVE_REGS_AND_STACK_ACCESS_API
190 select HAVE_RELIABLE_STACKTRACE
192 select HAVE_SOFTIRQ_ON_OWN_STACK
193 select HAVE_SYSCALL_TRACEPOINTS
194 select HAVE_VIRT_CPU_ACCOUNTING
195 select HAVE_VIRT_CPU_ACCOUNTING_IDLE
196 select IOMMU_HELPER if PCI
197 select IOMMU_SUPPORT if PCI
198 select MMU_GATHER_NO_GATHER
199 select MMU_GATHER_RCU_TABLE_FREE
200 select MODULES_USE_ELF_RELA
201 select NEED_DMA_MAP_STATE if PCI
202 select NEED_SG_DMA_LENGTH if PCI
204 select OLD_SIGSUSPEND3
205 select PCI_DOMAINS if PCI
206 select PCI_MSI if PCI
207 select PCI_MSI_ARCH_FALLBACKS if PCI_MSI
210 select SYSCTL_EXCEPTION_TRACE
211 select THREAD_INFO_IN_TASK
213 select VIRT_CPU_ACCOUNTING
215 # Note: keep the above list sorted alphabetically
217 config SCHED_OMIT_FRAME_POINTER
220 config PGTABLE_LEVELS
224 source "kernel/livepatch/Kconfig"
226 menu "Processor type and features"
228 config HAVE_MARCH_Z900_FEATURES
231 config HAVE_MARCH_Z990_FEATURES
233 select HAVE_MARCH_Z900_FEATURES
235 config HAVE_MARCH_Z9_109_FEATURES
237 select HAVE_MARCH_Z990_FEATURES
239 config HAVE_MARCH_Z10_FEATURES
241 select HAVE_MARCH_Z9_109_FEATURES
243 config HAVE_MARCH_Z196_FEATURES
245 select HAVE_MARCH_Z10_FEATURES
247 config HAVE_MARCH_ZEC12_FEATURES
249 select HAVE_MARCH_Z196_FEATURES
251 config HAVE_MARCH_Z13_FEATURES
253 select HAVE_MARCH_ZEC12_FEATURES
255 config HAVE_MARCH_Z14_FEATURES
257 select HAVE_MARCH_Z13_FEATURES
259 config HAVE_MARCH_Z15_FEATURES
261 select HAVE_MARCH_Z14_FEATURES
264 prompt "Processor type"
268 bool "IBM zSeries model z800 and z900"
269 select HAVE_MARCH_Z900_FEATURES
270 depends on $(cc-option,-march=z900)
272 Select this to enable optimizations for model z800/z900 (2064 and
273 2066 series). This will enable some optimizations that are not
274 available on older ESA/390 (31 Bit) only CPUs.
277 bool "IBM zSeries model z890 and z990"
278 select HAVE_MARCH_Z990_FEATURES
279 depends on $(cc-option,-march=z990)
281 Select this to enable optimizations for model z890/z990 (2084 and
282 2086 series). The kernel will be slightly faster but will not work
287 select HAVE_MARCH_Z9_109_FEATURES
288 depends on $(cc-option,-march=z9-109)
290 Select this to enable optimizations for IBM System z9 (2094 and
291 2096 series). The kernel will be slightly faster but will not work
295 bool "IBM System z10"
296 select HAVE_MARCH_Z10_FEATURES
297 depends on $(cc-option,-march=z10)
299 Select this to enable optimizations for IBM System z10 (2097 and
300 2098 series). The kernel will be slightly faster but will not work
304 bool "IBM zEnterprise 114 and 196"
305 select HAVE_MARCH_Z196_FEATURES
306 depends on $(cc-option,-march=z196)
308 Select this to enable optimizations for IBM zEnterprise 114 and 196
309 (2818 and 2817 series). The kernel will be slightly faster but will
310 not work on older machines.
313 bool "IBM zBC12 and zEC12"
314 select HAVE_MARCH_ZEC12_FEATURES
315 depends on $(cc-option,-march=zEC12)
317 Select this to enable optimizations for IBM zBC12 and zEC12 (2828 and
318 2827 series). The kernel will be slightly faster but will not work on
322 bool "IBM z13s and z13"
323 select HAVE_MARCH_Z13_FEATURES
324 depends on $(cc-option,-march=z13)
326 Select this to enable optimizations for IBM z13s and z13 (2965 and
327 2964 series). The kernel will be slightly faster but will not work on
331 bool "IBM z14 ZR1 and z14"
332 select HAVE_MARCH_Z14_FEATURES
333 depends on $(cc-option,-march=z14)
335 Select this to enable optimizations for IBM z14 ZR1 and z14 (3907
336 and 3906 series). The kernel will be slightly faster but will not
337 work on older machines.
341 select HAVE_MARCH_Z15_FEATURES
342 depends on $(cc-option,-march=z15)
344 Select this to enable optimizations for IBM z15 (8562
345 and 8561 series). The kernel will be slightly faster but will not
346 work on older machines.
350 config MARCH_Z900_TUNE
351 def_bool TUNE_Z900 || MARCH_Z900 && TUNE_DEFAULT
353 config MARCH_Z990_TUNE
354 def_bool TUNE_Z990 || MARCH_Z990 && TUNE_DEFAULT
356 config MARCH_Z9_109_TUNE
357 def_bool TUNE_Z9_109 || MARCH_Z9_109 && TUNE_DEFAULT
359 config MARCH_Z10_TUNE
360 def_bool TUNE_Z10 || MARCH_Z10 && TUNE_DEFAULT
362 config MARCH_Z196_TUNE
363 def_bool TUNE_Z196 || MARCH_Z196 && TUNE_DEFAULT
365 config MARCH_ZEC12_TUNE
366 def_bool TUNE_ZEC12 || MARCH_ZEC12 && TUNE_DEFAULT
368 config MARCH_Z13_TUNE
369 def_bool TUNE_Z13 || MARCH_Z13 && TUNE_DEFAULT
371 config MARCH_Z14_TUNE
372 def_bool TUNE_Z14 || MARCH_Z14 && TUNE_DEFAULT
374 config MARCH_Z15_TUNE
375 def_bool TUNE_Z15 || MARCH_Z15 && TUNE_DEFAULT
378 prompt "Tune code generation"
381 Cause the compiler to tune (-mtune) the generated code for a machine.
382 This will make the code run faster on the selected machine but
383 somewhat slower on other machines.
384 This option only changes how the compiler emits instructions, not the
385 selection of instructions itself, so the resulting kernel will run on
391 Tune the generated code for the target processor for which the kernel
395 bool "IBM zSeries model z800 and z900"
396 depends on $(cc-option,-mtune=z900)
399 bool "IBM zSeries model z890 and z990"
400 depends on $(cc-option,-mtune=z990)
404 depends on $(cc-option,-mtune=z9-109)
407 bool "IBM System z10"
408 depends on $(cc-option,-mtune=z10)
411 bool "IBM zEnterprise 114 and 196"
412 depends on $(cc-option,-mtune=z196)
415 bool "IBM zBC12 and zEC12"
416 depends on $(cc-option,-mtune=zEC12)
419 bool "IBM z13s and z13"
420 depends on $(cc-option,-mtune=z13)
423 bool "IBM z14 ZR1 and z14"
424 depends on $(cc-option,-mtune=z14)
428 depends on $(cc-option,-mtune=z15)
437 prompt "Kernel support for 31 bit emulation"
438 select ARCH_WANT_OLD_COMPAT_IPC
439 select COMPAT_OLD_SIGACTION
442 depends on !CC_IS_CLANG
444 Select this option if you want to enable your system kernel to
445 handle system-calls from ELF binaries for 31 bit ESA. This option
446 (and some other stuff like libraries and such) is needed for
447 executing 31 bit applications. It is safe to say "Y".
449 config SYSVIPC_COMPAT
450 def_bool y if COMPAT && SYSVIPC
456 int "Maximum number of CPUs (2-512)"
460 This allows you to specify the maximum number of CPUs which this
461 kernel will support. The maximum supported value is 512 and the
462 minimum value which makes sense is 2.
464 This is purely to save memory - each supported CPU adds
465 approximately sixteen kilobytes to the kernel image.
472 depends on SCHED_TOPOLOGY
477 This option adds NUMA support to the kernel.
496 config SCHED_TOPOLOGY
498 prompt "Topology scheduler support"
504 Topology scheduler support improves the CPU scheduler's decision
505 making when dealing with machines that have multi-threading,
506 multiple cores or multiple books.
508 source "kernel/Kconfig.hz"
515 bool "kexec file based system call"
519 depends on CRYPTO_SHA256
520 depends on CRYPTO_SHA256_S390
522 Enable the kexec file based system call. In contrast to the normal
523 kexec system call this system call takes file descriptors for the
524 kernel and initramfs as arguments.
526 config ARCH_HAS_KEXEC_PURGATORY
528 depends on KEXEC_FILE
531 bool "Verify kernel signature during kexec_file_load() syscall"
532 depends on KEXEC_FILE && MODULE_SIG_FORMAT
534 This option makes kernel signature verification mandatory for
535 the kexec_file_load() syscall.
537 In addition to that option, you need to enable signature
538 verification for the corresponding kernel image type being
539 loaded in order for this to work.
543 prompt "s390 architectural random number generation API"
545 Enable the s390 architectural random number generation API
546 to provide random data for all consumers within the Linux
549 When enabled the arch_random_* functions declared in linux/random.h
550 are implemented. The implementation is based on the s390 CPACF
551 instruction subfunction TRNG which provides a real true random
558 prompt "Enable modified branch prediction for the kernel by default"
560 If this option is selected the kernel will switch to a modified
561 branch prediction mode if the firmware interface is available.
562 The modified branch prediction mode improves the behaviour in
563 regard to speculative execution.
565 With the option enabled the kernel parameter "nobp=0" or "nospec"
566 can be used to run the kernel in the normal branch prediction mode.
568 With the option disabled the modified branch prediction mode is
569 enabled with the "nobp=1" kernel parameter.
575 prompt "Avoid speculative indirect branches in the kernel"
577 Compile the kernel with the expoline compiler options to guard
578 against kernel-to-user data leaks by avoiding speculative indirect
580 Requires a compiler with -mindirect-branch=thunk support for full
581 protection. The kernel may run slower.
586 prompt "Expoline default"
588 default EXPOLINE_FULL
591 bool "spectre_v2=off"
594 bool "spectre_v2=auto"
602 bool "Build a relocatable kernel"
603 select MODULE_REL_CRCS if MODVERSIONS
606 This builds a kernel image that retains relocation information
607 so it can be loaded at an arbitrary address.
608 The kernel is linked as a position-independent executable (PIE)
609 and contains dynamic relocations which are processed early in the
611 The relocations make the kernel image about 15% larger (compressed
612 10%), but are discarded at runtime.
614 config RANDOMIZE_BASE
615 bool "Randomize the address of the kernel image (KASLR)"
616 depends on RELOCATABLE
619 In support of Kernel Address Space Layout Randomization (KASLR),
620 this randomizes the address at which the kernel image is loaded,
621 as a security feature that deters exploit attempts relying on
622 knowledge of the location of kernel internals.
628 config ARCH_SPARSEMEM_ENABLE
630 select SPARSEMEM_VMEMMAP_ENABLE
631 select SPARSEMEM_VMEMMAP
633 config ARCH_SPARSEMEM_DEFAULT
636 config MAX_PHYSMEM_BITS
637 int "Maximum size of supported physical memory in bits (42-53)"
641 This option specifies the maximum supported size of physical memory
642 in bits. Supported is any size between 2^42 (4TB) and 2^53 (8PB).
643 Increasing the number of bits also increases the kernel image size.
644 By default 46 bits (64TB) are supported.
648 prompt "Pack kernel stack"
650 This option enables the compiler option -mkernel-backchain if it
651 is available. If the option is available the compiler supports
652 the new stack layout which dramatically reduces the minimum stack
653 frame size. With an old compiler a non-leaf function needs a
654 minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
655 -mkernel-backchain the minimum size drops to 16 byte on 31 bit
656 and 24 byte on 64 bit.
658 Say Y if you are unsure.
662 depends on !VMAP_STACK
663 prompt "Detect kernel stack overflow"
665 This option enables the compiler option -mstack-guard and
666 -mstack-size if they are available. If the compiler supports them
667 it will emit additional code to each function prolog to trigger
668 an illegal operation if the kernel stack is about to overflow.
670 Say N if you are unsure.
673 int "Size of the guard area (128-1024)"
675 depends on CHECK_STACK
678 This allows you to specify the size of the guard area at the lower
679 end of the kernel stack. If the kernel stack points into the guard
680 area on function entry an illegal operation is triggered. The size
681 needs to be a power of 2. Please keep in mind that the size of an
682 interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
683 The minimum size for the stack guard should be 256 for 31 bit and
686 config WARN_DYNAMIC_STACK
688 prompt "Emit compiler warnings for function with dynamic stack usage"
690 This option enables the compiler option -mwarn-dynamicstack. If the
691 compiler supports this options generates warnings for functions
692 that dynamically allocate stack space using alloca.
694 Say N if you are unsure.
702 prompt "QDIO support"
704 This driver provides the Queued Direct I/O base support for
707 To compile this driver as a module, choose M here: the
708 module will be called qdio.
714 config PCI_NR_FUNCTIONS
715 int "Maximum number of PCI functions (1-4096)"
719 This allows you to specify the maximum number of PCI functions which
720 this kernel will support.
729 prompt "Support for CHSC subchannels"
731 This driver allows usage of CHSC subchannels. A CHSC subchannel
732 is usually present on LPAR only.
733 The driver creates a device /dev/chsc, which may be used to
734 obtain I/O configuration information about the machine and
735 to issue asynchronous chsc commands (DANGEROUS).
736 You will usually only want to use this interface on a special
737 LPAR designated for system management.
739 To compile this driver as a module, choose M here: the
740 module will be called chsc_sch.
746 prompt "SCM bus driver"
748 Bus driver for Storage Class Memory.
752 prompt "Support for EADM subchannels"
755 This driver allows usage of EADM subchannels. EADM subchannels act
756 as a communication vehicle for SCM increments.
758 To compile this driver as a module, choose M here: the
759 module will be called eadm_sch.
763 prompt "Support for VFIO-CCW subchannels"
764 depends on S390_CCW_IOMMU && VFIO_MDEV
766 This driver allows usage of I/O subchannels via VFIO-CCW.
768 To compile this driver as a module, choose M here: the
769 module will be called vfio_ccw.
773 prompt "VFIO support for AP devices"
774 depends on S390_AP_IOMMU && VFIO_MDEV && KVM
777 This driver grants access to Adjunct Processor (AP) devices
778 via the VFIO mediated device interface.
780 To compile this driver as a module, choose M here: the module
781 will be called vfio_ap.
788 bool "kernel crash dumps"
791 Generate crash dump after being started by kexec.
792 Crash dump kernels are loaded in the main kernel with kexec-tools
793 into a specially reserved region and then later executed after
794 a crash by kdump/kexec.
795 Refer to <file:Documentation/s390/zfcpdump.rst> for more details on this.
796 This option also enables s390 zfcpdump.
797 See also <file:Documentation/s390/zfcpdump.rst>
806 default (SMC || CCWGROUP)
808 menu "Virtualization"
810 config PROTECTED_VIRTUALIZATION_GUEST
812 prompt "Protected virtualization guest support"
813 select ARCH_HAS_RESTRICTED_VIRTIO_MEMORY_ACCESS
815 Select this option, if you want to be able to run this
816 kernel as a protected virtualization KVM guest.
817 Protected virtualization capable machines have a mini hypervisor
818 located at machine level (an ultravisor). With help of the
819 Ultravisor, KVM will be able to run "protected" VMs, special
820 VMs whose memory and management data are unavailable to KVM.
824 prompt "Pseudo page fault support"
826 Select this option, if you want to use PFAULT pseudo page fault
827 handling under VM. If running native or in LPAR, this option
828 has no effect. If your VM does not support PFAULT, PAGEEX
829 pseudo page fault handling will be used.
830 Note that VM 4.2 supports PFAULT but has a bug in its
831 implementation that causes some problems.
832 Everybody who wants to run Linux under VM != VM4.2 should select
837 prompt "Cooperative memory management"
839 Select this option, if you want to enable the kernel interface
840 to reduce the memory size of the system. This is accomplished
841 by allocating pages of memory and put them "on hold". This only
842 makes sense for a system running under VM where the unused pages
843 will be reused by VM for other guest systems. The interface
844 allows an external monitor to balance memory of many systems.
845 Everybody who wants to run Linux under VM should select this
850 prompt "IUCV special message interface to cooperative memory management"
851 depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
853 Select this option to enable the special message interface to
854 the cooperative memory management.
858 prompt "Linux - VM Monitor Stream, base infrastructure"
859 depends on PROC_SYSCTL
861 This provides a kernel interface for creating and updating z/VM APPLDATA
862 monitor records. The monitor records are updated at certain time
863 intervals, once the timer is started.
864 Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
865 i.e. enables or disables monitoring on the Linux side.
866 A custom interval value (in seconds) can be written to
867 /proc/appldata/interval.
869 Defaults are 60 seconds interval and timer off.
870 The /proc entries can also be read from, showing the current settings.
874 prompt "Monitor memory management statistics"
875 depends on APPLDATA_BASE && VM_EVENT_COUNTERS
877 This provides memory management related data to the Linux - VM Monitor
878 Stream, like paging/swapping rate, memory utilisation, etc.
879 Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
880 APPLDATA monitor record, i.e. enables or disables monitoring this record
884 The /proc entry can also be read from, showing the current settings.
886 This can also be compiled as a module, which will be called
891 prompt "Monitor OS statistics"
892 depends on APPLDATA_BASE
894 This provides OS related data to the Linux - VM Monitor Stream, like
895 CPU utilisation, etc.
896 Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
897 APPLDATA monitor record, i.e. enables or disables monitoring this record
901 This can also be compiled as a module, which will be called
904 config APPLDATA_NET_SUM
906 prompt "Monitor overall network statistics"
907 depends on APPLDATA_BASE && NET
909 This provides network related data to the Linux - VM Monitor Stream,
910 currently there is only a total sum of network I/O statistics, no
912 Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
913 APPLDATA monitor record, i.e. enables or disables monitoring this record
917 This can also be compiled as a module, which will be called
922 prompt "s390 hypervisor file system support"
923 select SYS_HYPERVISOR
925 This is a virtual file system intended to provide accounting
926 information in an s390 hypervisor environment.
928 source "arch/s390/kvm/Kconfig"
932 prompt "s390 support for virtio devices"
934 select VIRTUALIZATION
937 Enabling this option adds support for virtio based paravirtual device
940 Select this option if you want to run the kernel as a guest under
947 config S390_UNWIND_SELFTEST
949 prompt "Test unwind functions"
951 This option enables s390 specific stack unwinder testing kernel
952 module. This option is not useful for distributions or general
953 kernels, but only for kernel developers working on architecture code.
955 Say N if you are unsure.