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_KFENCE
142 select HAVE_ARCH_RANDOMIZE_KSTACK_OFFSET
143 select HAVE_ARCH_SECCOMP_FILTER
144 select HAVE_ARCH_SOFT_DIRTY
145 select HAVE_ARCH_TRACEHOOK
146 select HAVE_ARCH_TRANSPARENT_HUGEPAGE
147 select HAVE_ARCH_VMAP_STACK
148 select HAVE_ASM_MODVERSIONS
149 select HAVE_CMPXCHG_DOUBLE
150 select HAVE_CMPXCHG_LOCAL
151 select HAVE_DEBUG_KMEMLEAK
152 select HAVE_DMA_CONTIGUOUS
153 select HAVE_DYNAMIC_FTRACE
154 select HAVE_DYNAMIC_FTRACE_WITH_REGS
155 select HAVE_EBPF_JIT if PACK_STACK && HAVE_MARCH_Z196_FEATURES
156 select HAVE_EFFICIENT_UNALIGNED_ACCESS
159 select HAVE_FTRACE_MCOUNT_RECORD
160 select HAVE_FUNCTION_ERROR_INJECTION
161 select HAVE_FUNCTION_GRAPH_TRACER
162 select HAVE_FUNCTION_TRACER
163 select HAVE_FUTEX_CMPXCHG if FUTEX
164 select HAVE_GCC_PLUGINS
165 select HAVE_GENERIC_VDSO
166 select HAVE_IOREMAP_PROT if PCI
167 select HAVE_KERNEL_BZIP2
168 select HAVE_KERNEL_GZIP
169 select HAVE_KERNEL_LZ4
170 select HAVE_KERNEL_LZMA
171 select HAVE_KERNEL_LZO
172 select HAVE_KERNEL_UNCOMPRESSED
173 select HAVE_KERNEL_XZ
174 select HAVE_KERNEL_ZSTD
176 select HAVE_KPROBES_ON_FTRACE
177 select HAVE_KRETPROBES
179 select HAVE_LIVEPATCH
180 select HAVE_MEMBLOCK_PHYS_MAP
181 select HAVE_MOD_ARCH_SPECIFIC
183 select HAVE_NOP_MCOUNT
185 select HAVE_PERF_EVENTS
186 select HAVE_PERF_REGS
187 select HAVE_PERF_USER_STACK_DUMP
188 select HAVE_REGS_AND_STACK_ACCESS_API
189 select HAVE_RELIABLE_STACKTRACE
191 select HAVE_SOFTIRQ_ON_OWN_STACK
192 select HAVE_SYSCALL_TRACEPOINTS
193 select HAVE_VIRT_CPU_ACCOUNTING
194 select HAVE_VIRT_CPU_ACCOUNTING_IDLE
195 select IOMMU_HELPER if PCI
196 select IOMMU_SUPPORT if PCI
197 select MMU_GATHER_NO_GATHER
198 select MMU_GATHER_RCU_TABLE_FREE
199 select MODULES_USE_ELF_RELA
200 select NEED_DMA_MAP_STATE if PCI
201 select NEED_SG_DMA_LENGTH if PCI
203 select OLD_SIGSUSPEND3
204 select PCI_DOMAINS if PCI
205 select PCI_MSI if PCI
206 select PCI_MSI_ARCH_FALLBACKS if PCI_MSI
209 select SYSCTL_EXCEPTION_TRACE
210 select THREAD_INFO_IN_TASK
212 select VIRT_CPU_ACCOUNTING
214 # Note: keep the above list sorted alphabetically
216 config SCHED_OMIT_FRAME_POINTER
219 config PGTABLE_LEVELS
223 source "kernel/livepatch/Kconfig"
225 menu "Processor type and features"
227 config HAVE_MARCH_Z900_FEATURES
230 config HAVE_MARCH_Z990_FEATURES
232 select HAVE_MARCH_Z900_FEATURES
234 config HAVE_MARCH_Z9_109_FEATURES
236 select HAVE_MARCH_Z990_FEATURES
238 config HAVE_MARCH_Z10_FEATURES
240 select HAVE_MARCH_Z9_109_FEATURES
242 config HAVE_MARCH_Z196_FEATURES
244 select HAVE_MARCH_Z10_FEATURES
246 config HAVE_MARCH_ZEC12_FEATURES
248 select HAVE_MARCH_Z196_FEATURES
250 config HAVE_MARCH_Z13_FEATURES
252 select HAVE_MARCH_ZEC12_FEATURES
254 config HAVE_MARCH_Z14_FEATURES
256 select HAVE_MARCH_Z13_FEATURES
258 config HAVE_MARCH_Z15_FEATURES
260 select HAVE_MARCH_Z14_FEATURES
263 prompt "Processor type"
267 bool "IBM zSeries model z800 and z900"
268 select HAVE_MARCH_Z900_FEATURES
269 depends on $(cc-option,-march=z900)
271 Select this to enable optimizations for model z800/z900 (2064 and
272 2066 series). This will enable some optimizations that are not
273 available on older ESA/390 (31 Bit) only CPUs.
276 bool "IBM zSeries model z890 and z990"
277 select HAVE_MARCH_Z990_FEATURES
278 depends on $(cc-option,-march=z990)
280 Select this to enable optimizations for model z890/z990 (2084 and
281 2086 series). The kernel will be slightly faster but will not work
286 select HAVE_MARCH_Z9_109_FEATURES
287 depends on $(cc-option,-march=z9-109)
289 Select this to enable optimizations for IBM System z9 (2094 and
290 2096 series). The kernel will be slightly faster but will not work
294 bool "IBM System z10"
295 select HAVE_MARCH_Z10_FEATURES
296 depends on $(cc-option,-march=z10)
298 Select this to enable optimizations for IBM System z10 (2097 and
299 2098 series). The kernel will be slightly faster but will not work
303 bool "IBM zEnterprise 114 and 196"
304 select HAVE_MARCH_Z196_FEATURES
305 depends on $(cc-option,-march=z196)
307 Select this to enable optimizations for IBM zEnterprise 114 and 196
308 (2818 and 2817 series). The kernel will be slightly faster but will
309 not work on older machines.
312 bool "IBM zBC12 and zEC12"
313 select HAVE_MARCH_ZEC12_FEATURES
314 depends on $(cc-option,-march=zEC12)
316 Select this to enable optimizations for IBM zBC12 and zEC12 (2828 and
317 2827 series). The kernel will be slightly faster but will not work on
321 bool "IBM z13s and z13"
322 select HAVE_MARCH_Z13_FEATURES
323 depends on $(cc-option,-march=z13)
325 Select this to enable optimizations for IBM z13s and z13 (2965 and
326 2964 series). The kernel will be slightly faster but will not work on
330 bool "IBM z14 ZR1 and z14"
331 select HAVE_MARCH_Z14_FEATURES
332 depends on $(cc-option,-march=z14)
334 Select this to enable optimizations for IBM z14 ZR1 and z14 (3907
335 and 3906 series). The kernel will be slightly faster but will not
336 work on older machines.
340 select HAVE_MARCH_Z15_FEATURES
341 depends on $(cc-option,-march=z15)
343 Select this to enable optimizations for IBM z15 (8562
344 and 8561 series). The kernel will be slightly faster but will not
345 work on older machines.
349 config MARCH_Z900_TUNE
350 def_bool TUNE_Z900 || MARCH_Z900 && TUNE_DEFAULT
352 config MARCH_Z990_TUNE
353 def_bool TUNE_Z990 || MARCH_Z990 && TUNE_DEFAULT
355 config MARCH_Z9_109_TUNE
356 def_bool TUNE_Z9_109 || MARCH_Z9_109 && TUNE_DEFAULT
358 config MARCH_Z10_TUNE
359 def_bool TUNE_Z10 || MARCH_Z10 && TUNE_DEFAULT
361 config MARCH_Z196_TUNE
362 def_bool TUNE_Z196 || MARCH_Z196 && TUNE_DEFAULT
364 config MARCH_ZEC12_TUNE
365 def_bool TUNE_ZEC12 || MARCH_ZEC12 && TUNE_DEFAULT
367 config MARCH_Z13_TUNE
368 def_bool TUNE_Z13 || MARCH_Z13 && TUNE_DEFAULT
370 config MARCH_Z14_TUNE
371 def_bool TUNE_Z14 || MARCH_Z14 && TUNE_DEFAULT
373 config MARCH_Z15_TUNE
374 def_bool TUNE_Z15 || MARCH_Z15 && TUNE_DEFAULT
377 prompt "Tune code generation"
380 Cause the compiler to tune (-mtune) the generated code for a machine.
381 This will make the code run faster on the selected machine but
382 somewhat slower on other machines.
383 This option only changes how the compiler emits instructions, not the
384 selection of instructions itself, so the resulting kernel will run on
390 Tune the generated code for the target processor for which the kernel
394 bool "IBM zSeries model z800 and z900"
395 depends on $(cc-option,-mtune=z900)
398 bool "IBM zSeries model z890 and z990"
399 depends on $(cc-option,-mtune=z990)
403 depends on $(cc-option,-mtune=z9-109)
406 bool "IBM System z10"
407 depends on $(cc-option,-mtune=z10)
410 bool "IBM zEnterprise 114 and 196"
411 depends on $(cc-option,-mtune=z196)
414 bool "IBM zBC12 and zEC12"
415 depends on $(cc-option,-mtune=zEC12)
418 bool "IBM z13s and z13"
419 depends on $(cc-option,-mtune=z13)
422 bool "IBM z14 ZR1 and z14"
423 depends on $(cc-option,-mtune=z14)
427 depends on $(cc-option,-mtune=z15)
436 prompt "Kernel support for 31 bit emulation"
437 select ARCH_WANT_OLD_COMPAT_IPC
438 select COMPAT_OLD_SIGACTION
441 depends on !CC_IS_CLANG
443 Select this option if you want to enable your system kernel to
444 handle system-calls from ELF binaries for 31 bit ESA. This option
445 (and some other stuff like libraries and such) is needed for
446 executing 31 bit applications. It is safe to say "Y".
448 config SYSVIPC_COMPAT
449 def_bool y if COMPAT && SYSVIPC
455 int "Maximum number of CPUs (2-512)"
459 This allows you to specify the maximum number of CPUs which this
460 kernel will support. The maximum supported value is 512 and the
461 minimum value which makes sense is 2.
463 This is purely to save memory - each supported CPU adds
464 approximately sixteen kilobytes to the kernel image.
471 depends on SCHED_TOPOLOGY
476 This option adds NUMA support to the kernel.
495 config SCHED_TOPOLOGY
497 prompt "Topology scheduler support"
503 Topology scheduler support improves the CPU scheduler's decision
504 making when dealing with machines that have multi-threading,
505 multiple cores or multiple books.
507 source "kernel/Kconfig.hz"
514 bool "kexec file based system call"
518 depends on CRYPTO_SHA256
519 depends on CRYPTO_SHA256_S390
521 Enable the kexec file based system call. In contrast to the normal
522 kexec system call this system call takes file descriptors for the
523 kernel and initramfs as arguments.
525 config ARCH_HAS_KEXEC_PURGATORY
527 depends on KEXEC_FILE
530 bool "Verify kernel signature during kexec_file_load() syscall"
531 depends on KEXEC_FILE && MODULE_SIG_FORMAT
533 This option makes kernel signature verification mandatory for
534 the kexec_file_load() syscall.
536 In addition to that option, you need to enable signature
537 verification for the corresponding kernel image type being
538 loaded in order for this to work.
542 prompt "s390 architectural random number generation API"
544 Enable the s390 architectural random number generation API
545 to provide random data for all consumers within the Linux
548 When enabled the arch_random_* functions declared in linux/random.h
549 are implemented. The implementation is based on the s390 CPACF
550 instruction subfunction TRNG which provides a real true random
557 prompt "Enable modified branch prediction for the kernel by default"
559 If this option is selected the kernel will switch to a modified
560 branch prediction mode if the firmware interface is available.
561 The modified branch prediction mode improves the behaviour in
562 regard to speculative execution.
564 With the option enabled the kernel parameter "nobp=0" or "nospec"
565 can be used to run the kernel in the normal branch prediction mode.
567 With the option disabled the modified branch prediction mode is
568 enabled with the "nobp=1" kernel parameter.
574 prompt "Avoid speculative indirect branches in the kernel"
576 Compile the kernel with the expoline compiler options to guard
577 against kernel-to-user data leaks by avoiding speculative indirect
579 Requires a compiler with -mindirect-branch=thunk support for full
580 protection. The kernel may run slower.
585 prompt "Expoline default"
587 default EXPOLINE_FULL
590 bool "spectre_v2=off"
593 bool "spectre_v2=auto"
601 bool "Build a relocatable kernel"
602 select MODULE_REL_CRCS if MODVERSIONS
605 This builds a kernel image that retains relocation information
606 so it can be loaded at an arbitrary address.
607 The kernel is linked as a position-independent executable (PIE)
608 and contains dynamic relocations which are processed early in the
610 The relocations make the kernel image about 15% larger (compressed
611 10%), but are discarded at runtime.
613 config RANDOMIZE_BASE
614 bool "Randomize the address of the kernel image (KASLR)"
615 depends on RELOCATABLE
618 In support of Kernel Address Space Layout Randomization (KASLR),
619 this randomizes the address at which the kernel image is loaded,
620 as a security feature that deters exploit attempts relying on
621 knowledge of the location of kernel internals.
627 config ARCH_SPARSEMEM_ENABLE
629 select SPARSEMEM_VMEMMAP_ENABLE
630 select SPARSEMEM_VMEMMAP
632 config ARCH_SPARSEMEM_DEFAULT
635 config MAX_PHYSMEM_BITS
636 int "Maximum size of supported physical memory in bits (42-53)"
640 This option specifies the maximum supported size of physical memory
641 in bits. Supported is any size between 2^42 (4TB) and 2^53 (8PB).
642 Increasing the number of bits also increases the kernel image size.
643 By default 46 bits (64TB) are supported.
647 prompt "Pack kernel stack"
649 This option enables the compiler option -mkernel-backchain if it
650 is available. If the option is available the compiler supports
651 the new stack layout which dramatically reduces the minimum stack
652 frame size. With an old compiler a non-leaf function needs a
653 minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
654 -mkernel-backchain the minimum size drops to 16 byte on 31 bit
655 and 24 byte on 64 bit.
657 Say Y if you are unsure.
661 depends on !VMAP_STACK
662 prompt "Detect kernel stack overflow"
664 This option enables the compiler option -mstack-guard and
665 -mstack-size if they are available. If the compiler supports them
666 it will emit additional code to each function prolog to trigger
667 an illegal operation if the kernel stack is about to overflow.
669 Say N if you are unsure.
672 int "Size of the guard area (128-1024)"
674 depends on CHECK_STACK
677 This allows you to specify the size of the guard area at the lower
678 end of the kernel stack. If the kernel stack points into the guard
679 area on function entry an illegal operation is triggered. The size
680 needs to be a power of 2. Please keep in mind that the size of an
681 interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
682 The minimum size for the stack guard should be 256 for 31 bit and
685 config WARN_DYNAMIC_STACK
687 prompt "Emit compiler warnings for function with dynamic stack usage"
689 This option enables the compiler option -mwarn-dynamicstack. If the
690 compiler supports this options generates warnings for functions
691 that dynamically allocate stack space using alloca.
693 Say N if you are unsure.
701 prompt "QDIO support"
703 This driver provides the Queued Direct I/O base support for
706 To compile this driver as a module, choose M here: the
707 module will be called qdio.
713 config PCI_NR_FUNCTIONS
714 int "Maximum number of PCI functions (1-4096)"
718 This allows you to specify the maximum number of PCI functions which
719 this kernel will support.
728 prompt "Support for CHSC subchannels"
730 This driver allows usage of CHSC subchannels. A CHSC subchannel
731 is usually present on LPAR only.
732 The driver creates a device /dev/chsc, which may be used to
733 obtain I/O configuration information about the machine and
734 to issue asynchronous chsc commands (DANGEROUS).
735 You will usually only want to use this interface on a special
736 LPAR designated for system management.
738 To compile this driver as a module, choose M here: the
739 module will be called chsc_sch.
745 prompt "SCM bus driver"
747 Bus driver for Storage Class Memory.
751 prompt "Support for EADM subchannels"
754 This driver allows usage of EADM subchannels. EADM subchannels act
755 as a communication vehicle for SCM increments.
757 To compile this driver as a module, choose M here: the
758 module will be called eadm_sch.
762 prompt "Support for VFIO-CCW subchannels"
763 depends on S390_CCW_IOMMU && VFIO_MDEV
765 This driver allows usage of I/O subchannels via VFIO-CCW.
767 To compile this driver as a module, choose M here: the
768 module will be called vfio_ccw.
772 prompt "VFIO support for AP devices"
773 depends on S390_AP_IOMMU && VFIO_MDEV && KVM
776 This driver grants access to Adjunct Processor (AP) devices
777 via the VFIO mediated device interface.
779 To compile this driver as a module, choose M here: the module
780 will be called vfio_ap.
787 bool "kernel crash dumps"
790 Generate crash dump after being started by kexec.
791 Crash dump kernels are loaded in the main kernel with kexec-tools
792 into a specially reserved region and then later executed after
793 a crash by kdump/kexec.
794 Refer to <file:Documentation/s390/zfcpdump.rst> for more details on this.
795 This option also enables s390 zfcpdump.
796 See also <file:Documentation/s390/zfcpdump.rst>
805 default (SMC || CCWGROUP)
807 menu "Virtualization"
809 config PROTECTED_VIRTUALIZATION_GUEST
811 prompt "Protected virtualization guest support"
812 select ARCH_HAS_RESTRICTED_VIRTIO_MEMORY_ACCESS
814 Select this option, if you want to be able to run this
815 kernel as a protected virtualization KVM guest.
816 Protected virtualization capable machines have a mini hypervisor
817 located at machine level (an ultravisor). With help of the
818 Ultravisor, KVM will be able to run "protected" VMs, special
819 VMs whose memory and management data are unavailable to KVM.
823 prompt "Pseudo page fault support"
825 Select this option, if you want to use PFAULT pseudo page fault
826 handling under VM. If running native or in LPAR, this option
827 has no effect. If your VM does not support PFAULT, PAGEEX
828 pseudo page fault handling will be used.
829 Note that VM 4.2 supports PFAULT but has a bug in its
830 implementation that causes some problems.
831 Everybody who wants to run Linux under VM != VM4.2 should select
836 prompt "Cooperative memory management"
838 Select this option, if you want to enable the kernel interface
839 to reduce the memory size of the system. This is accomplished
840 by allocating pages of memory and put them "on hold". This only
841 makes sense for a system running under VM where the unused pages
842 will be reused by VM for other guest systems. The interface
843 allows an external monitor to balance memory of many systems.
844 Everybody who wants to run Linux under VM should select this
849 prompt "IUCV special message interface to cooperative memory management"
850 depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
852 Select this option to enable the special message interface to
853 the cooperative memory management.
857 prompt "Linux - VM Monitor Stream, base infrastructure"
858 depends on PROC_SYSCTL
860 This provides a kernel interface for creating and updating z/VM APPLDATA
861 monitor records. The monitor records are updated at certain time
862 intervals, once the timer is started.
863 Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
864 i.e. enables or disables monitoring on the Linux side.
865 A custom interval value (in seconds) can be written to
866 /proc/appldata/interval.
868 Defaults are 60 seconds interval and timer off.
869 The /proc entries can also be read from, showing the current settings.
873 prompt "Monitor memory management statistics"
874 depends on APPLDATA_BASE && VM_EVENT_COUNTERS
876 This provides memory management related data to the Linux - VM Monitor
877 Stream, like paging/swapping rate, memory utilisation, etc.
878 Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
879 APPLDATA monitor record, i.e. enables or disables monitoring this record
883 The /proc entry can also be read from, showing the current settings.
885 This can also be compiled as a module, which will be called
890 prompt "Monitor OS statistics"
891 depends on APPLDATA_BASE
893 This provides OS related data to the Linux - VM Monitor Stream, like
894 CPU utilisation, etc.
895 Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
896 APPLDATA monitor record, i.e. enables or disables monitoring this record
900 This can also be compiled as a module, which will be called
903 config APPLDATA_NET_SUM
905 prompt "Monitor overall network statistics"
906 depends on APPLDATA_BASE && NET
908 This provides network related data to the Linux - VM Monitor Stream,
909 currently there is only a total sum of network I/O statistics, no
911 Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
912 APPLDATA monitor record, i.e. enables or disables monitoring this record
916 This can also be compiled as a module, which will be called
921 prompt "s390 hypervisor file system support"
922 select SYS_HYPERVISOR
924 This is a virtual file system intended to provide accounting
925 information in an s390 hypervisor environment.
927 source "arch/s390/kvm/Kconfig"
931 prompt "s390 support for virtio devices"
933 select VIRTUALIZATION
936 Enabling this option adds support for virtio based paravirtual device
939 Select this option if you want to run the kernel as a guest under
946 config S390_UNWIND_SELFTEST
948 prompt "Test unwind functions"
950 This option enables s390 specific stack unwinder testing kernel
951 module. This option is not useful for distributions or general
952 kernels, but only for kernel developers working on architecture code.
954 Say N if you are unsure.