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_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_REGS
157 select HAVE_EBPF_JIT if PACK_STACK && HAVE_MARCH_Z196_FEATURES
158 select HAVE_EFFICIENT_UNALIGNED_ACCESS
161 select HAVE_FTRACE_MCOUNT_RECORD
162 select HAVE_FUNCTION_ERROR_INJECTION
163 select HAVE_FUNCTION_GRAPH_TRACER
164 select HAVE_FUNCTION_TRACER
165 select HAVE_FUTEX_CMPXCHG if FUTEX
166 select HAVE_GCC_PLUGINS
167 select HAVE_GENERIC_VDSO
168 select HAVE_IOREMAP_PROT if PCI
169 select HAVE_KERNEL_BZIP2
170 select HAVE_KERNEL_GZIP
171 select HAVE_KERNEL_LZ4
172 select HAVE_KERNEL_LZMA
173 select HAVE_KERNEL_LZO
174 select HAVE_KERNEL_UNCOMPRESSED
175 select HAVE_KERNEL_XZ
176 select HAVE_KERNEL_ZSTD
178 select HAVE_KPROBES_ON_FTRACE
179 select HAVE_KRETPROBES
181 select HAVE_LIVEPATCH
182 select HAVE_MEMBLOCK_PHYS_MAP
183 select HAVE_MOD_ARCH_SPECIFIC
185 select HAVE_NOP_MCOUNT
187 select HAVE_PERF_EVENTS
188 select HAVE_PERF_REGS
189 select HAVE_PERF_USER_STACK_DUMP
190 select HAVE_REGS_AND_STACK_ACCESS_API
191 select HAVE_RELIABLE_STACKTRACE
193 select HAVE_SOFTIRQ_ON_OWN_STACK
194 select HAVE_SYSCALL_TRACEPOINTS
195 select HAVE_VIRT_CPU_ACCOUNTING
196 select HAVE_VIRT_CPU_ACCOUNTING_IDLE
197 select IOMMU_HELPER if PCI
198 select IOMMU_SUPPORT if PCI
199 select MMU_GATHER_NO_GATHER
200 select MMU_GATHER_RCU_TABLE_FREE
201 select MODULES_USE_ELF_RELA
202 select NEED_DMA_MAP_STATE if PCI
203 select NEED_SG_DMA_LENGTH if PCI
205 select OLD_SIGSUSPEND3
206 select PCI_DOMAINS if PCI
207 select PCI_MSI if PCI
208 select PCI_MSI_ARCH_FALLBACKS if PCI_MSI
211 select SYSCTL_EXCEPTION_TRACE
212 select THREAD_INFO_IN_TASK
213 select TRACE_IRQFLAGS_SUPPORT
215 select VIRT_CPU_ACCOUNTING
217 # Note: keep the above list sorted alphabetically
219 config SCHED_OMIT_FRAME_POINTER
222 config PGTABLE_LEVELS
226 source "kernel/livepatch/Kconfig"
228 menu "Processor type and features"
230 config HAVE_MARCH_Z900_FEATURES
233 config HAVE_MARCH_Z990_FEATURES
235 select HAVE_MARCH_Z900_FEATURES
237 config HAVE_MARCH_Z9_109_FEATURES
239 select HAVE_MARCH_Z990_FEATURES
241 config HAVE_MARCH_Z10_FEATURES
243 select HAVE_MARCH_Z9_109_FEATURES
245 config HAVE_MARCH_Z196_FEATURES
247 select HAVE_MARCH_Z10_FEATURES
249 config HAVE_MARCH_ZEC12_FEATURES
251 select HAVE_MARCH_Z196_FEATURES
253 config HAVE_MARCH_Z13_FEATURES
255 select HAVE_MARCH_ZEC12_FEATURES
257 config HAVE_MARCH_Z14_FEATURES
259 select HAVE_MARCH_Z13_FEATURES
261 config HAVE_MARCH_Z15_FEATURES
263 select HAVE_MARCH_Z14_FEATURES
266 prompt "Processor type"
270 bool "IBM zSeries model z800 and z900"
271 select HAVE_MARCH_Z900_FEATURES
272 depends on $(cc-option,-march=z900)
274 Select this to enable optimizations for model z800/z900 (2064 and
275 2066 series). This will enable some optimizations that are not
276 available on older ESA/390 (31 Bit) only CPUs.
279 bool "IBM zSeries model z890 and z990"
280 select HAVE_MARCH_Z990_FEATURES
281 depends on $(cc-option,-march=z990)
283 Select this to enable optimizations for model z890/z990 (2084 and
284 2086 series). The kernel will be slightly faster but will not work
289 select HAVE_MARCH_Z9_109_FEATURES
290 depends on $(cc-option,-march=z9-109)
292 Select this to enable optimizations for IBM System z9 (2094 and
293 2096 series). The kernel will be slightly faster but will not work
297 bool "IBM System z10"
298 select HAVE_MARCH_Z10_FEATURES
299 depends on $(cc-option,-march=z10)
301 Select this to enable optimizations for IBM System z10 (2097 and
302 2098 series). The kernel will be slightly faster but will not work
306 bool "IBM zEnterprise 114 and 196"
307 select HAVE_MARCH_Z196_FEATURES
308 depends on $(cc-option,-march=z196)
310 Select this to enable optimizations for IBM zEnterprise 114 and 196
311 (2818 and 2817 series). The kernel will be slightly faster but will
312 not work on older machines.
315 bool "IBM zBC12 and zEC12"
316 select HAVE_MARCH_ZEC12_FEATURES
317 depends on $(cc-option,-march=zEC12)
319 Select this to enable optimizations for IBM zBC12 and zEC12 (2828 and
320 2827 series). The kernel will be slightly faster but will not work on
324 bool "IBM z13s and z13"
325 select HAVE_MARCH_Z13_FEATURES
326 depends on $(cc-option,-march=z13)
328 Select this to enable optimizations for IBM z13s and z13 (2965 and
329 2964 series). The kernel will be slightly faster but will not work on
333 bool "IBM z14 ZR1 and z14"
334 select HAVE_MARCH_Z14_FEATURES
335 depends on $(cc-option,-march=z14)
337 Select this to enable optimizations for IBM z14 ZR1 and z14 (3907
338 and 3906 series). The kernel will be slightly faster but will not
339 work on older machines.
343 select HAVE_MARCH_Z15_FEATURES
344 depends on $(cc-option,-march=z15)
346 Select this to enable optimizations for IBM z15 (8562
347 and 8561 series). The kernel will be slightly faster but will not
348 work on older machines.
352 config MARCH_Z900_TUNE
353 def_bool TUNE_Z900 || MARCH_Z900 && TUNE_DEFAULT
355 config MARCH_Z990_TUNE
356 def_bool TUNE_Z990 || MARCH_Z990 && TUNE_DEFAULT
358 config MARCH_Z9_109_TUNE
359 def_bool TUNE_Z9_109 || MARCH_Z9_109 && TUNE_DEFAULT
361 config MARCH_Z10_TUNE
362 def_bool TUNE_Z10 || MARCH_Z10 && TUNE_DEFAULT
364 config MARCH_Z196_TUNE
365 def_bool TUNE_Z196 || MARCH_Z196 && TUNE_DEFAULT
367 config MARCH_ZEC12_TUNE
368 def_bool TUNE_ZEC12 || MARCH_ZEC12 && TUNE_DEFAULT
370 config MARCH_Z13_TUNE
371 def_bool TUNE_Z13 || MARCH_Z13 && TUNE_DEFAULT
373 config MARCH_Z14_TUNE
374 def_bool TUNE_Z14 || MARCH_Z14 && TUNE_DEFAULT
376 config MARCH_Z15_TUNE
377 def_bool TUNE_Z15 || MARCH_Z15 && TUNE_DEFAULT
380 prompt "Tune code generation"
383 Cause the compiler to tune (-mtune) the generated code for a machine.
384 This will make the code run faster on the selected machine but
385 somewhat slower on other machines.
386 This option only changes how the compiler emits instructions, not the
387 selection of instructions itself, so the resulting kernel will run on
393 Tune the generated code for the target processor for which the kernel
397 bool "IBM zSeries model z800 and z900"
398 depends on $(cc-option,-mtune=z900)
401 bool "IBM zSeries model z890 and z990"
402 depends on $(cc-option,-mtune=z990)
406 depends on $(cc-option,-mtune=z9-109)
409 bool "IBM System z10"
410 depends on $(cc-option,-mtune=z10)
413 bool "IBM zEnterprise 114 and 196"
414 depends on $(cc-option,-mtune=z196)
417 bool "IBM zBC12 and zEC12"
418 depends on $(cc-option,-mtune=zEC12)
421 bool "IBM z13s and z13"
422 depends on $(cc-option,-mtune=z13)
425 bool "IBM z14 ZR1 and z14"
426 depends on $(cc-option,-mtune=z14)
430 depends on $(cc-option,-mtune=z15)
439 prompt "Kernel support for 31 bit emulation"
440 select ARCH_WANT_OLD_COMPAT_IPC
441 select COMPAT_OLD_SIGACTION
444 depends on !CC_IS_CLANG
446 Select this option if you want to enable your system kernel to
447 handle system-calls from ELF binaries for 31 bit ESA. This option
448 (and some other stuff like libraries and such) is needed for
449 executing 31 bit applications. It is safe to say "Y".
451 config SYSVIPC_COMPAT
452 def_bool y if COMPAT && SYSVIPC
458 int "Maximum number of CPUs (2-512)"
462 This allows you to specify the maximum number of CPUs which this
463 kernel will support. The maximum supported value is 512 and the
464 minimum value which makes sense is 2.
466 This is purely to save memory - each supported CPU adds
467 approximately sixteen kilobytes to the kernel image.
474 depends on SCHED_TOPOLOGY
479 This option adds NUMA support to the kernel.
498 config SCHED_TOPOLOGY
500 prompt "Topology scheduler support"
506 Topology scheduler support improves the CPU scheduler's decision
507 making when dealing with machines that have multi-threading,
508 multiple cores or multiple books.
510 source "kernel/Kconfig.hz"
517 bool "kexec file based system call"
521 depends on CRYPTO_SHA256
522 depends on CRYPTO_SHA256_S390
524 Enable the kexec file based system call. In contrast to the normal
525 kexec system call this system call takes file descriptors for the
526 kernel and initramfs as arguments.
528 config ARCH_HAS_KEXEC_PURGATORY
530 depends on KEXEC_FILE
533 bool "Verify kernel signature during kexec_file_load() syscall"
534 depends on KEXEC_FILE && MODULE_SIG_FORMAT
536 This option makes kernel signature verification mandatory for
537 the kexec_file_load() syscall.
539 In addition to that option, you need to enable signature
540 verification for the corresponding kernel image type being
541 loaded in order for this to work.
545 prompt "s390 architectural random number generation API"
547 Enable the s390 architectural random number generation API
548 to provide random data for all consumers within the Linux
551 When enabled the arch_random_* functions declared in linux/random.h
552 are implemented. The implementation is based on the s390 CPACF
553 instruction subfunction TRNG which provides a real true random
560 prompt "Enable modified branch prediction for the kernel by default"
562 If this option is selected the kernel will switch to a modified
563 branch prediction mode if the firmware interface is available.
564 The modified branch prediction mode improves the behaviour in
565 regard to speculative execution.
567 With the option enabled the kernel parameter "nobp=0" or "nospec"
568 can be used to run the kernel in the normal branch prediction mode.
570 With the option disabled the modified branch prediction mode is
571 enabled with the "nobp=1" kernel parameter.
577 prompt "Avoid speculative indirect branches in the kernel"
579 Compile the kernel with the expoline compiler options to guard
580 against kernel-to-user data leaks by avoiding speculative indirect
582 Requires a compiler with -mindirect-branch=thunk support for full
583 protection. The kernel may run slower.
588 prompt "Expoline default"
590 default EXPOLINE_FULL
593 bool "spectre_v2=off"
596 bool "spectre_v2=auto"
604 bool "Build a relocatable kernel"
605 select MODULE_REL_CRCS if MODVERSIONS
608 This builds a kernel image that retains relocation information
609 so it can be loaded at an arbitrary address.
610 The kernel is linked as a position-independent executable (PIE)
611 and contains dynamic relocations which are processed early in the
613 The relocations make the kernel image about 15% larger (compressed
614 10%), but are discarded at runtime.
616 config RANDOMIZE_BASE
617 bool "Randomize the address of the kernel image (KASLR)"
618 depends on RELOCATABLE
621 In support of Kernel Address Space Layout Randomization (KASLR),
622 this randomizes the address at which the kernel image is loaded,
623 as a security feature that deters exploit attempts relying on
624 knowledge of the location of kernel internals.
630 config ARCH_SPARSEMEM_ENABLE
632 select SPARSEMEM_VMEMMAP_ENABLE
633 select SPARSEMEM_VMEMMAP
635 config ARCH_SPARSEMEM_DEFAULT
638 config MAX_PHYSMEM_BITS
639 int "Maximum size of supported physical memory in bits (42-53)"
643 This option specifies the maximum supported size of physical memory
644 in bits. Supported is any size between 2^42 (4TB) and 2^53 (8PB).
645 Increasing the number of bits also increases the kernel image size.
646 By default 46 bits (64TB) are supported.
650 prompt "Pack kernel stack"
652 This option enables the compiler option -mkernel-backchain if it
653 is available. If the option is available the compiler supports
654 the new stack layout which dramatically reduces the minimum stack
655 frame size. With an old compiler a non-leaf function needs a
656 minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
657 -mkernel-backchain the minimum size drops to 16 byte on 31 bit
658 and 24 byte on 64 bit.
660 Say Y if you are unsure.
664 depends on !VMAP_STACK
665 prompt "Detect kernel stack overflow"
667 This option enables the compiler option -mstack-guard and
668 -mstack-size if they are available. If the compiler supports them
669 it will emit additional code to each function prolog to trigger
670 an illegal operation if the kernel stack is about to overflow.
672 Say N if you are unsure.
675 int "Size of the guard area (128-1024)"
677 depends on CHECK_STACK
680 This allows you to specify the size of the guard area at the lower
681 end of the kernel stack. If the kernel stack points into the guard
682 area on function entry an illegal operation is triggered. The size
683 needs to be a power of 2. Please keep in mind that the size of an
684 interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
685 The minimum size for the stack guard should be 256 for 31 bit and
688 config WARN_DYNAMIC_STACK
690 prompt "Emit compiler warnings for function with dynamic stack usage"
692 This option enables the compiler option -mwarn-dynamicstack. If the
693 compiler supports this options generates warnings for functions
694 that dynamically allocate stack space using alloca.
696 Say N if you are unsure.
704 prompt "QDIO support"
706 This driver provides the Queued Direct I/O base support for
709 To compile this driver as a module, choose M here: the
710 module will be called qdio.
716 config PCI_NR_FUNCTIONS
717 int "Maximum number of PCI functions (1-4096)"
721 This allows you to specify the maximum number of PCI functions which
722 this kernel will support.
731 prompt "Support for CHSC subchannels"
733 This driver allows usage of CHSC subchannels. A CHSC subchannel
734 is usually present on LPAR only.
735 The driver creates a device /dev/chsc, which may be used to
736 obtain I/O configuration information about the machine and
737 to issue asynchronous chsc commands (DANGEROUS).
738 You will usually only want to use this interface on a special
739 LPAR designated for system management.
741 To compile this driver as a module, choose M here: the
742 module will be called chsc_sch.
748 prompt "SCM bus driver"
750 Bus driver for Storage Class Memory.
754 prompt "Support for EADM subchannels"
757 This driver allows usage of EADM subchannels. EADM subchannels act
758 as a communication vehicle for SCM increments.
760 To compile this driver as a module, choose M here: the
761 module will be called eadm_sch.
765 prompt "Support for VFIO-CCW subchannels"
766 depends on S390_CCW_IOMMU && VFIO_MDEV
768 This driver allows usage of I/O subchannels via VFIO-CCW.
770 To compile this driver as a module, choose M here: the
771 module will be called vfio_ccw.
775 prompt "VFIO support for AP devices"
776 depends on S390_AP_IOMMU && VFIO_MDEV && KVM
779 This driver grants access to Adjunct Processor (AP) devices
780 via the VFIO mediated device interface.
782 To compile this driver as a module, choose M here: the module
783 will be called vfio_ap.
790 bool "kernel crash dumps"
793 Generate crash dump after being started by kexec.
794 Crash dump kernels are loaded in the main kernel with kexec-tools
795 into a specially reserved region and then later executed after
796 a crash by kdump/kexec.
797 Refer to <file:Documentation/s390/zfcpdump.rst> for more details on this.
798 This option also enables s390 zfcpdump.
799 See also <file:Documentation/s390/zfcpdump.rst>
808 default (SMC || CCWGROUP)
810 menu "Virtualization"
812 config PROTECTED_VIRTUALIZATION_GUEST
814 prompt "Protected virtualization guest support"
815 select ARCH_HAS_RESTRICTED_VIRTIO_MEMORY_ACCESS
817 Select this option, if you want to be able to run this
818 kernel as a protected virtualization KVM guest.
819 Protected virtualization capable machines have a mini hypervisor
820 located at machine level (an ultravisor). With help of the
821 Ultravisor, KVM will be able to run "protected" VMs, special
822 VMs whose memory and management data are unavailable to KVM.
826 prompt "Pseudo page fault support"
828 Select this option, if you want to use PFAULT pseudo page fault
829 handling under VM. If running native or in LPAR, this option
830 has no effect. If your VM does not support PFAULT, PAGEEX
831 pseudo page fault handling will be used.
832 Note that VM 4.2 supports PFAULT but has a bug in its
833 implementation that causes some problems.
834 Everybody who wants to run Linux under VM != VM4.2 should select
839 prompt "Cooperative memory management"
841 Select this option, if you want to enable the kernel interface
842 to reduce the memory size of the system. This is accomplished
843 by allocating pages of memory and put them "on hold". This only
844 makes sense for a system running under VM where the unused pages
845 will be reused by VM for other guest systems. The interface
846 allows an external monitor to balance memory of many systems.
847 Everybody who wants to run Linux under VM should select this
852 prompt "IUCV special message interface to cooperative memory management"
853 depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
855 Select this option to enable the special message interface to
856 the cooperative memory management.
860 prompt "Linux - VM Monitor Stream, base infrastructure"
861 depends on PROC_SYSCTL
863 This provides a kernel interface for creating and updating z/VM APPLDATA
864 monitor records. The monitor records are updated at certain time
865 intervals, once the timer is started.
866 Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
867 i.e. enables or disables monitoring on the Linux side.
868 A custom interval value (in seconds) can be written to
869 /proc/appldata/interval.
871 Defaults are 60 seconds interval and timer off.
872 The /proc entries can also be read from, showing the current settings.
876 prompt "Monitor memory management statistics"
877 depends on APPLDATA_BASE && VM_EVENT_COUNTERS
879 This provides memory management related data to the Linux - VM Monitor
880 Stream, like paging/swapping rate, memory utilisation, etc.
881 Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
882 APPLDATA monitor record, i.e. enables or disables monitoring this record
886 The /proc entry can also be read from, showing the current settings.
888 This can also be compiled as a module, which will be called
893 prompt "Monitor OS statistics"
894 depends on APPLDATA_BASE
896 This provides OS related data to the Linux - VM Monitor Stream, like
897 CPU utilisation, etc.
898 Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
899 APPLDATA monitor record, i.e. enables or disables monitoring this record
903 This can also be compiled as a module, which will be called
906 config APPLDATA_NET_SUM
908 prompt "Monitor overall network statistics"
909 depends on APPLDATA_BASE && NET
911 This provides network related data to the Linux - VM Monitor Stream,
912 currently there is only a total sum of network I/O statistics, no
914 Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
915 APPLDATA monitor record, i.e. enables or disables monitoring this record
919 This can also be compiled as a module, which will be called
924 prompt "s390 hypervisor file system support"
925 select SYS_HYPERVISOR
927 This is a virtual file system intended to provide accounting
928 information in an s390 hypervisor environment.
930 source "arch/s390/kvm/Kconfig"
934 prompt "s390 support for virtio devices"
936 select VIRTUALIZATION
939 Enabling this option adds support for virtio based paravirtual device
942 Select this option if you want to run the kernel as a guest under
949 config S390_UNWIND_SELFTEST
951 prompt "Test unwind functions"
953 This option enables s390 specific stack unwinder testing kernel
954 module. This option is not useful for distributions or general
955 kernels, but only for kernel developers working on architecture code.
957 Say N if you are unsure.