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_SAMPLE_FTRACE_DIRECT_MULTI
198 select HAVE_SOFTIRQ_ON_OWN_STACK
199 select HAVE_SYSCALL_TRACEPOINTS
200 select HAVE_VIRT_CPU_ACCOUNTING
201 select HAVE_VIRT_CPU_ACCOUNTING_IDLE
202 select IOMMU_HELPER if PCI
203 select IOMMU_SUPPORT if PCI
204 select MMU_GATHER_NO_GATHER
205 select MMU_GATHER_RCU_TABLE_FREE
206 select MODULES_USE_ELF_RELA
207 select NEED_DMA_MAP_STATE if PCI
208 select NEED_SG_DMA_LENGTH if PCI
210 select OLD_SIGSUSPEND3
211 select PCI_DOMAINS if PCI
212 select PCI_MSI if PCI
213 select PCI_MSI_ARCH_FALLBACKS if PCI_MSI
216 select SYSCTL_EXCEPTION_TRACE
217 select THREAD_INFO_IN_TASK
218 select TRACE_IRQFLAGS_SUPPORT
220 select VIRT_CPU_ACCOUNTING
222 # Note: keep the above list sorted alphabetically
224 config SCHED_OMIT_FRAME_POINTER
227 config PGTABLE_LEVELS
231 source "kernel/livepatch/Kconfig"
233 menu "Processor type and features"
235 config HAVE_MARCH_Z900_FEATURES
238 config HAVE_MARCH_Z990_FEATURES
240 select HAVE_MARCH_Z900_FEATURES
242 config HAVE_MARCH_Z9_109_FEATURES
244 select HAVE_MARCH_Z990_FEATURES
246 config HAVE_MARCH_Z10_FEATURES
248 select HAVE_MARCH_Z9_109_FEATURES
250 config HAVE_MARCH_Z196_FEATURES
252 select HAVE_MARCH_Z10_FEATURES
254 config HAVE_MARCH_ZEC12_FEATURES
256 select HAVE_MARCH_Z196_FEATURES
258 config HAVE_MARCH_Z13_FEATURES
260 select HAVE_MARCH_ZEC12_FEATURES
262 config HAVE_MARCH_Z14_FEATURES
264 select HAVE_MARCH_Z13_FEATURES
266 config HAVE_MARCH_Z15_FEATURES
268 select HAVE_MARCH_Z14_FEATURES
271 prompt "Processor type"
275 bool "IBM zSeries model z800 and z900"
276 select HAVE_MARCH_Z900_FEATURES
277 depends on $(cc-option,-march=z900)
279 Select this to enable optimizations for model z800/z900 (2064 and
280 2066 series). This will enable some optimizations that are not
281 available on older ESA/390 (31 Bit) only CPUs.
284 bool "IBM zSeries model z890 and z990"
285 select HAVE_MARCH_Z990_FEATURES
286 depends on $(cc-option,-march=z990)
288 Select this to enable optimizations for model z890/z990 (2084 and
289 2086 series). The kernel will be slightly faster but will not work
294 select HAVE_MARCH_Z9_109_FEATURES
295 depends on $(cc-option,-march=z9-109)
297 Select this to enable optimizations for IBM System z9 (2094 and
298 2096 series). The kernel will be slightly faster but will not work
302 bool "IBM System z10"
303 select HAVE_MARCH_Z10_FEATURES
304 depends on $(cc-option,-march=z10)
306 Select this to enable optimizations for IBM System z10 (2097 and
307 2098 series). The kernel will be slightly faster but will not work
311 bool "IBM zEnterprise 114 and 196"
312 select HAVE_MARCH_Z196_FEATURES
313 depends on $(cc-option,-march=z196)
315 Select this to enable optimizations for IBM zEnterprise 114 and 196
316 (2818 and 2817 series). The kernel will be slightly faster but will
317 not work on older machines.
320 bool "IBM zBC12 and zEC12"
321 select HAVE_MARCH_ZEC12_FEATURES
322 depends on $(cc-option,-march=zEC12)
324 Select this to enable optimizations for IBM zBC12 and zEC12 (2828 and
325 2827 series). The kernel will be slightly faster but will not work on
329 bool "IBM z13s and z13"
330 select HAVE_MARCH_Z13_FEATURES
331 depends on $(cc-option,-march=z13)
333 Select this to enable optimizations for IBM z13s and z13 (2965 and
334 2964 series). The kernel will be slightly faster but will not work on
338 bool "IBM z14 ZR1 and z14"
339 select HAVE_MARCH_Z14_FEATURES
340 depends on $(cc-option,-march=z14)
342 Select this to enable optimizations for IBM z14 ZR1 and z14 (3907
343 and 3906 series). The kernel will be slightly faster but will not
344 work on older machines.
348 select HAVE_MARCH_Z15_FEATURES
349 depends on $(cc-option,-march=z15)
351 Select this to enable optimizations for IBM z15 (8562
352 and 8561 series). The kernel will be slightly faster but will not
353 work on older machines.
357 config MARCH_Z900_TUNE
358 def_bool TUNE_Z900 || MARCH_Z900 && TUNE_DEFAULT
360 config MARCH_Z990_TUNE
361 def_bool TUNE_Z990 || MARCH_Z990 && TUNE_DEFAULT
363 config MARCH_Z9_109_TUNE
364 def_bool TUNE_Z9_109 || MARCH_Z9_109 && TUNE_DEFAULT
366 config MARCH_Z10_TUNE
367 def_bool TUNE_Z10 || MARCH_Z10 && TUNE_DEFAULT
369 config MARCH_Z196_TUNE
370 def_bool TUNE_Z196 || MARCH_Z196 && TUNE_DEFAULT
372 config MARCH_ZEC12_TUNE
373 def_bool TUNE_ZEC12 || MARCH_ZEC12 && TUNE_DEFAULT
375 config MARCH_Z13_TUNE
376 def_bool TUNE_Z13 || MARCH_Z13 && TUNE_DEFAULT
378 config MARCH_Z14_TUNE
379 def_bool TUNE_Z14 || MARCH_Z14 && TUNE_DEFAULT
381 config MARCH_Z15_TUNE
382 def_bool TUNE_Z15 || MARCH_Z15 && TUNE_DEFAULT
385 prompt "Tune code generation"
388 Cause the compiler to tune (-mtune) the generated code for a machine.
389 This will make the code run faster on the selected machine but
390 somewhat slower on other machines.
391 This option only changes how the compiler emits instructions, not the
392 selection of instructions itself, so the resulting kernel will run on
398 Tune the generated code for the target processor for which the kernel
402 bool "IBM zSeries model z800 and z900"
403 depends on $(cc-option,-mtune=z900)
406 bool "IBM zSeries model z890 and z990"
407 depends on $(cc-option,-mtune=z990)
411 depends on $(cc-option,-mtune=z9-109)
414 bool "IBM System z10"
415 depends on $(cc-option,-mtune=z10)
418 bool "IBM zEnterprise 114 and 196"
419 depends on $(cc-option,-mtune=z196)
422 bool "IBM zBC12 and zEC12"
423 depends on $(cc-option,-mtune=zEC12)
426 bool "IBM z13s and z13"
427 depends on $(cc-option,-mtune=z13)
430 bool "IBM z14 ZR1 and z14"
431 depends on $(cc-option,-mtune=z14)
435 depends on $(cc-option,-mtune=z15)
442 config COMMAND_LINE_SIZE
443 int "Maximum size of kernel command line"
447 This allows you to specify the maximum length of the kernel command
452 prompt "Kernel support for 31 bit emulation"
453 select ARCH_WANT_OLD_COMPAT_IPC
454 select COMPAT_OLD_SIGACTION
457 depends on !CC_IS_CLANG
459 Select this option if you want to enable your system kernel to
460 handle system-calls from ELF binaries for 31 bit ESA. This option
461 (and some other stuff like libraries and such) is needed for
462 executing 31 bit applications. It is safe to say "Y".
464 config SYSVIPC_COMPAT
465 def_bool y if COMPAT && SYSVIPC
471 int "Maximum number of CPUs (2-512)"
475 This allows you to specify the maximum number of CPUs which this
476 kernel will support. The maximum supported value is 512 and the
477 minimum value which makes sense is 2.
479 This is purely to save memory - each supported CPU adds
480 approximately sixteen kilobytes to the kernel image.
487 depends on SCHED_TOPOLOGY
492 This option adds NUMA support to the kernel.
511 config SCHED_TOPOLOGY
513 prompt "Topology scheduler support"
519 Topology scheduler support improves the CPU scheduler's decision
520 making when dealing with machines that have multi-threading,
521 multiple cores or multiple books.
523 source "kernel/Kconfig.hz"
530 bool "kexec file based system call"
534 depends on CRYPTO_SHA256
535 depends on CRYPTO_SHA256_S390
537 Enable the kexec file based system call. In contrast to the normal
538 kexec system call this system call takes file descriptors for the
539 kernel and initramfs as arguments.
541 config ARCH_HAS_KEXEC_PURGATORY
543 depends on KEXEC_FILE
546 bool "Verify kernel signature during kexec_file_load() syscall"
547 depends on KEXEC_FILE && MODULE_SIG_FORMAT
549 This option makes kernel signature verification mandatory for
550 the kexec_file_load() syscall.
552 In addition to that option, you need to enable signature
553 verification for the corresponding kernel image type being
554 loaded in order for this to work.
558 prompt "s390 architectural random number generation API"
560 Enable the s390 architectural random number generation API
561 to provide random data for all consumers within the Linux
564 When enabled the arch_random_* functions declared in linux/random.h
565 are implemented. The implementation is based on the s390 CPACF
566 instruction subfunction TRNG which provides a real true random
573 prompt "Enable modified branch prediction for the kernel by default"
575 If this option is selected the kernel will switch to a modified
576 branch prediction mode if the firmware interface is available.
577 The modified branch prediction mode improves the behaviour in
578 regard to speculative execution.
580 With the option enabled the kernel parameter "nobp=0" or "nospec"
581 can be used to run the kernel in the normal branch prediction mode.
583 With the option disabled the modified branch prediction mode is
584 enabled with the "nobp=1" kernel parameter.
590 prompt "Avoid speculative indirect branches in the kernel"
592 Compile the kernel with the expoline compiler options to guard
593 against kernel-to-user data leaks by avoiding speculative indirect
595 Requires a compiler with -mindirect-branch=thunk support for full
596 protection. The kernel may run slower.
601 prompt "Expoline default"
603 default EXPOLINE_FULL
606 bool "spectre_v2=off"
609 bool "spectre_v2=auto"
617 bool "Build a relocatable kernel"
618 select MODULE_REL_CRCS if MODVERSIONS
621 This builds a kernel image that retains relocation information
622 so it can be loaded at an arbitrary address.
623 The kernel is linked as a position-independent executable (PIE)
624 and contains dynamic relocations which are processed early in the
626 The relocations make the kernel image about 15% larger (compressed
627 10%), but are discarded at runtime.
629 config RANDOMIZE_BASE
630 bool "Randomize the address of the kernel image (KASLR)"
631 depends on RELOCATABLE
634 In support of Kernel Address Space Layout Randomization (KASLR),
635 this randomizes the address at which the kernel image is loaded,
636 as a security feature that deters exploit attempts relying on
637 knowledge of the location of kernel internals.
643 config ARCH_SPARSEMEM_ENABLE
645 select SPARSEMEM_VMEMMAP_ENABLE
646 select SPARSEMEM_VMEMMAP
648 config ARCH_SPARSEMEM_DEFAULT
651 config MAX_PHYSMEM_BITS
652 int "Maximum size of supported physical memory in bits (42-53)"
656 This option specifies the maximum supported size of physical memory
657 in bits. Supported is any size between 2^42 (4TB) and 2^53 (8PB).
658 Increasing the number of bits also increases the kernel image size.
659 By default 46 bits (64TB) are supported.
663 prompt "Pack kernel stack"
665 This option enables the compiler option -mkernel-backchain if it
666 is available. If the option is available the compiler supports
667 the new stack layout which dramatically reduces the minimum stack
668 frame size. With an old compiler a non-leaf function needs a
669 minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
670 -mkernel-backchain the minimum size drops to 16 byte on 31 bit
671 and 24 byte on 64 bit.
673 Say Y if you are unsure.
677 depends on !VMAP_STACK
678 prompt "Detect kernel stack overflow"
680 This option enables the compiler option -mstack-guard and
681 -mstack-size if they are available. If the compiler supports them
682 it will emit additional code to each function prolog to trigger
683 an illegal operation if the kernel stack is about to overflow.
685 Say N if you are unsure.
688 int "Size of the guard area (128-1024)"
690 depends on CHECK_STACK
693 This allows you to specify the size of the guard area at the lower
694 end of the kernel stack. If the kernel stack points into the guard
695 area on function entry an illegal operation is triggered. The size
696 needs to be a power of 2. Please keep in mind that the size of an
697 interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
698 The minimum size for the stack guard should be 256 for 31 bit and
707 prompt "QDIO support"
709 This driver provides the Queued Direct I/O base support for
712 To compile this driver as a module, choose M here: the
713 module will be called qdio.
719 config PCI_NR_FUNCTIONS
720 int "Maximum number of PCI functions (1-4096)"
724 This allows you to specify the maximum number of PCI functions which
725 this kernel will support.
734 prompt "Support for CHSC subchannels"
736 This driver allows usage of CHSC subchannels. A CHSC subchannel
737 is usually present on LPAR only.
738 The driver creates a device /dev/chsc, which may be used to
739 obtain I/O configuration information about the machine and
740 to issue asynchronous chsc commands (DANGEROUS).
741 You will usually only want to use this interface on a special
742 LPAR designated for system management.
744 To compile this driver as a module, choose M here: the
745 module will be called chsc_sch.
751 prompt "SCM bus driver"
753 Bus driver for Storage Class Memory.
757 prompt "Support for EADM subchannels"
760 This driver allows usage of EADM subchannels. EADM subchannels act
761 as a communication vehicle for SCM increments.
763 To compile this driver as a module, choose M here: the
764 module will be called eadm_sch.
768 prompt "Support for VFIO-CCW subchannels"
769 depends on S390_CCW_IOMMU && VFIO_MDEV
771 This driver allows usage of I/O subchannels via VFIO-CCW.
773 To compile this driver as a module, choose M here: the
774 module will be called vfio_ccw.
778 prompt "VFIO support for AP devices"
779 depends on S390_AP_IOMMU && VFIO_MDEV && KVM
782 This driver grants access to Adjunct Processor (AP) devices
783 via the VFIO mediated device interface.
785 To compile this driver as a module, choose M here: the module
786 will be called vfio_ap.
793 bool "kernel crash dumps"
796 Generate crash dump after being started by kexec.
797 Crash dump kernels are loaded in the main kernel with kexec-tools
798 into a specially reserved region and then later executed after
799 a crash by kdump/kexec.
800 Refer to <file:Documentation/s390/zfcpdump.rst> for more details on this.
801 This option also enables s390 zfcpdump.
802 See also <file:Documentation/s390/zfcpdump.rst>
811 default (SMC || CCWGROUP)
813 menu "Virtualization"
815 config PROTECTED_VIRTUALIZATION_GUEST
817 prompt "Protected virtualization guest support"
818 select ARCH_HAS_RESTRICTED_VIRTIO_MEMORY_ACCESS
820 Select this option, if you want to be able to run this
821 kernel as a protected virtualization KVM guest.
822 Protected virtualization capable machines have a mini hypervisor
823 located at machine level (an ultravisor). With help of the
824 Ultravisor, KVM will be able to run "protected" VMs, special
825 VMs whose memory and management data are unavailable to KVM.
829 prompt "Pseudo page fault support"
831 Select this option, if you want to use PFAULT pseudo page fault
832 handling under VM. If running native or in LPAR, this option
833 has no effect. If your VM does not support PFAULT, PAGEEX
834 pseudo page fault handling will be used.
835 Note that VM 4.2 supports PFAULT but has a bug in its
836 implementation that causes some problems.
837 Everybody who wants to run Linux under VM != VM4.2 should select
842 prompt "Cooperative memory management"
844 Select this option, if you want to enable the kernel interface
845 to reduce the memory size of the system. This is accomplished
846 by allocating pages of memory and put them "on hold". This only
847 makes sense for a system running under VM where the unused pages
848 will be reused by VM for other guest systems. The interface
849 allows an external monitor to balance memory of many systems.
850 Everybody who wants to run Linux under VM should select this
855 prompt "IUCV special message interface to cooperative memory management"
856 depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
858 Select this option to enable the special message interface to
859 the cooperative memory management.
863 prompt "Linux - VM Monitor Stream, base infrastructure"
864 depends on PROC_SYSCTL
866 This provides a kernel interface for creating and updating z/VM APPLDATA
867 monitor records. The monitor records are updated at certain time
868 intervals, once the timer is started.
869 Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
870 i.e. enables or disables monitoring on the Linux side.
871 A custom interval value (in seconds) can be written to
872 /proc/appldata/interval.
874 Defaults are 60 seconds interval and timer off.
875 The /proc entries can also be read from, showing the current settings.
879 prompt "Monitor memory management statistics"
880 depends on APPLDATA_BASE && VM_EVENT_COUNTERS
882 This provides memory management related data to the Linux - VM Monitor
883 Stream, like paging/swapping rate, memory utilisation, etc.
884 Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
885 APPLDATA monitor record, i.e. enables or disables monitoring this record
889 The /proc entry can also be read from, showing the current settings.
891 This can also be compiled as a module, which will be called
896 prompt "Monitor OS statistics"
897 depends on APPLDATA_BASE
899 This provides OS related data to the Linux - VM Monitor Stream, like
900 CPU utilisation, etc.
901 Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
902 APPLDATA monitor record, i.e. enables or disables monitoring this record
906 This can also be compiled as a module, which will be called
909 config APPLDATA_NET_SUM
911 prompt "Monitor overall network statistics"
912 depends on APPLDATA_BASE && NET
914 This provides network related data to the Linux - VM Monitor Stream,
915 currently there is only a total sum of network I/O statistics, no
917 Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
918 APPLDATA monitor record, i.e. enables or disables monitoring this record
922 This can also be compiled as a module, which will be called
927 prompt "s390 hypervisor file system support"
928 select SYS_HYPERVISOR
930 This is a virtual file system intended to provide accounting
931 information in an s390 hypervisor environment.
933 source "arch/s390/kvm/Kconfig"
937 prompt "s390 support for virtio devices"
939 select VIRTUALIZATION
942 Enabling this option adds support for virtio based paravirtual device
945 Select this option if you want to run the kernel as a guest under
952 config S390_UNWIND_SELFTEST
955 default KUNIT_ALL_TESTS
956 prompt "Test unwind functions"
958 This option enables s390 specific stack unwinder testing kernel
959 module. This option is not useful for distributions or general
960 kernels, but only for kernel developers working on architecture code.
962 Say N if you are unsure.
964 config S390_KPROBES_SANITY_TEST
966 prompt "Enable s390 specific kprobes tests"
970 This option enables an s390 specific kprobes test module. This option
971 is not useful for distributions or general kernels, but only for kernel
972 developers working on architecture code.
974 Say N if you are unsure.