1 # SPDX-License-Identifier: GPL-2.0
11 config LOCKDEP_SUPPORT
14 config STACKTRACE_SUPPORT
17 config RWSEM_GENERIC_SPINLOCK
20 config RWSEM_XCHGADD_ALGORITHM
23 config ARCH_HAS_ILOG2_U32
26 config ARCH_HAS_ILOG2_U64
29 config GENERIC_HWEIGHT
35 config GENERIC_BUG_RELATIVE_POINTERS
38 config ARCH_DMA_ADDR_T_64BIT
41 config GENERIC_LOCKBREAK
42 def_bool y if SMP && PREEMPT
47 config ARCH_SUPPORTS_DEBUG_PAGEALLOC
59 config ARCH_SUPPORTS_UPROBES
64 select ARCH_BINFMT_ELF_STATE
65 select ARCH_HAS_DEVMEM_IS_ALLOWED
66 select ARCH_HAS_ELF_RANDOMIZE
67 select ARCH_HAS_FORTIFY_SOURCE
68 select ARCH_HAS_GCOV_PROFILE_ALL
69 select ARCH_HAS_GIGANTIC_PAGE if (MEMORY_ISOLATION && COMPACTION) || CMA
71 select ARCH_HAS_SET_MEMORY
72 select ARCH_HAS_SG_CHAIN
73 select ARCH_HAS_STRICT_KERNEL_RWX
74 select ARCH_HAS_STRICT_MODULE_RWX
75 select ARCH_HAS_UBSAN_SANITIZE_ALL
76 select ARCH_HAVE_NMI_SAFE_CMPXCHG
77 select ARCH_INLINE_READ_LOCK
78 select ARCH_INLINE_READ_LOCK_BH
79 select ARCH_INLINE_READ_LOCK_IRQ
80 select ARCH_INLINE_READ_LOCK_IRQSAVE
81 select ARCH_INLINE_READ_TRYLOCK
82 select ARCH_INLINE_READ_UNLOCK
83 select ARCH_INLINE_READ_UNLOCK_BH
84 select ARCH_INLINE_READ_UNLOCK_IRQ
85 select ARCH_INLINE_READ_UNLOCK_IRQRESTORE
86 select ARCH_INLINE_SPIN_LOCK
87 select ARCH_INLINE_SPIN_LOCK_BH
88 select ARCH_INLINE_SPIN_LOCK_IRQ
89 select ARCH_INLINE_SPIN_LOCK_IRQSAVE
90 select ARCH_INLINE_SPIN_TRYLOCK
91 select ARCH_INLINE_SPIN_TRYLOCK_BH
92 select ARCH_INLINE_SPIN_UNLOCK
93 select ARCH_INLINE_SPIN_UNLOCK_BH
94 select ARCH_INLINE_SPIN_UNLOCK_IRQ
95 select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE
96 select ARCH_INLINE_WRITE_LOCK
97 select ARCH_INLINE_WRITE_LOCK_BH
98 select ARCH_INLINE_WRITE_LOCK_IRQ
99 select ARCH_INLINE_WRITE_LOCK_IRQSAVE
100 select ARCH_INLINE_WRITE_TRYLOCK
101 select ARCH_INLINE_WRITE_UNLOCK
102 select ARCH_INLINE_WRITE_UNLOCK_BH
103 select ARCH_INLINE_WRITE_UNLOCK_IRQ
104 select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE
105 select ARCH_SAVE_PAGE_KEYS if HIBERNATION
106 select ARCH_SUPPORTS_ATOMIC_RMW
107 select ARCH_SUPPORTS_NUMA_BALANCING
108 select ARCH_USE_BUILTIN_BSWAP
109 select ARCH_USE_CMPXCHG_LOCKREF
110 select ARCH_WANTS_DYNAMIC_TASK_STRUCT
111 select ARCH_WANTS_UBSAN_NO_NULL
112 select ARCH_WANT_IPC_PARSE_VERSION
113 select BUILDTIME_EXTABLE_SORT
114 select CLONE_BACKWARDS2
115 select DYNAMIC_FTRACE if FUNCTION_TRACER
116 select GENERIC_CLOCKEVENTS
117 select GENERIC_CPU_AUTOPROBE
118 select GENERIC_CPU_DEVICES if !SMP
119 select GENERIC_CPU_VULNERABILITIES
120 select GENERIC_FIND_FIRST_BIT
121 select GENERIC_SMP_IDLE_THREAD
122 select GENERIC_TIME_VSYSCALL
123 select HAVE_ALIGNED_STRUCT_PAGE if SLUB
124 select HAVE_ARCH_AUDITSYSCALL
125 select HAVE_ARCH_JUMP_LABEL
126 select CPU_NO_EFFICIENT_FFS if !HAVE_MARCH_Z9_109_FEATURES
127 select HAVE_ARCH_SECCOMP_FILTER
128 select HAVE_ARCH_SOFT_DIRTY
129 select HAVE_ARCH_TRACEHOOK
130 select HAVE_ARCH_TRANSPARENT_HUGEPAGE
131 select HAVE_EBPF_JIT if PACK_STACK && HAVE_MARCH_Z196_FEATURES
132 select HAVE_CMPXCHG_DOUBLE
133 select HAVE_CMPXCHG_LOCAL
134 select HAVE_COPY_THREAD_TLS
135 select HAVE_DEBUG_KMEMLEAK
136 select HAVE_DMA_API_DEBUG
137 select HAVE_DMA_CONTIGUOUS
138 select DMA_DIRECT_OPS
139 select HAVE_DYNAMIC_FTRACE
140 select HAVE_DYNAMIC_FTRACE_WITH_REGS
141 select HAVE_EFFICIENT_UNALIGNED_ACCESS
142 select HAVE_FTRACE_MCOUNT_RECORD
143 select HAVE_FUNCTION_GRAPH_TRACER
144 select HAVE_FUNCTION_TRACER
145 select HAVE_FUTEX_CMPXCHG if FUTEX
146 select HAVE_GCC_PLUGINS
147 select HAVE_KERNEL_BZIP2
148 select HAVE_KERNEL_GZIP
149 select HAVE_KERNEL_LZ4
150 select HAVE_KERNEL_LZMA
151 select HAVE_KERNEL_LZO
152 select HAVE_KERNEL_XZ
154 select HAVE_KRETPROBES
156 select HAVE_LIVEPATCH
157 select HAVE_PERF_REGS
158 select HAVE_PERF_USER_STACK_DUMP
160 select HAVE_MEMBLOCK_NODE_MAP
161 select HAVE_MEMBLOCK_PHYS_MAP
162 select HAVE_MOD_ARCH_SPECIFIC
164 select HAVE_PERF_EVENTS
165 select HAVE_REGS_AND_STACK_ACCESS_API
166 select HAVE_SYSCALL_TRACEPOINTS
167 select HAVE_VIRT_CPU_ACCOUNTING
168 select MODULES_USE_ELF_RELA
171 select OLD_SIGSUSPEND3
173 select SYSCTL_EXCEPTION_TRACE
174 select THREAD_INFO_IN_TASK
176 select VIRT_CPU_ACCOUNTING
177 select ARCH_HAS_SCALED_CPUTIME
182 config SCHED_OMIT_FRAME_POINTER
185 config PGTABLE_LEVELS
189 source "init/Kconfig"
191 source "kernel/Kconfig.freezer"
193 source "kernel/livepatch/Kconfig"
195 menu "Processor type and features"
197 config HAVE_MARCH_Z900_FEATURES
200 config HAVE_MARCH_Z990_FEATURES
202 select HAVE_MARCH_Z900_FEATURES
204 config HAVE_MARCH_Z9_109_FEATURES
206 select HAVE_MARCH_Z990_FEATURES
208 config HAVE_MARCH_Z10_FEATURES
210 select HAVE_MARCH_Z9_109_FEATURES
212 config HAVE_MARCH_Z196_FEATURES
214 select HAVE_MARCH_Z10_FEATURES
216 config HAVE_MARCH_ZEC12_FEATURES
218 select HAVE_MARCH_Z196_FEATURES
220 config HAVE_MARCH_Z13_FEATURES
222 select HAVE_MARCH_ZEC12_FEATURES
224 config HAVE_MARCH_Z14_FEATURES
226 select HAVE_MARCH_Z13_FEATURES
229 prompt "Processor type"
233 bool "IBM zSeries model z800 and z900"
234 select HAVE_MARCH_Z900_FEATURES
236 Select this to enable optimizations for model z800/z900 (2064 and
237 2066 series). This will enable some optimizations that are not
238 available on older ESA/390 (31 Bit) only CPUs.
241 bool "IBM zSeries model z890 and z990"
242 select HAVE_MARCH_Z990_FEATURES
244 Select this to enable optimizations for model z890/z990 (2084 and
245 2086 series). The kernel will be slightly faster but will not work
250 select HAVE_MARCH_Z9_109_FEATURES
252 Select this to enable optimizations for IBM System z9 (2094 and
253 2096 series). The kernel will be slightly faster but will not work
257 bool "IBM System z10"
258 select HAVE_MARCH_Z10_FEATURES
260 Select this to enable optimizations for IBM System z10 (2097 and
261 2098 series). The kernel will be slightly faster but will not work
265 bool "IBM zEnterprise 114 and 196"
266 select HAVE_MARCH_Z196_FEATURES
268 Select this to enable optimizations for IBM zEnterprise 114 and 196
269 (2818 and 2817 series). The kernel will be slightly faster but will
270 not work on older machines.
273 bool "IBM zBC12 and zEC12"
274 select HAVE_MARCH_ZEC12_FEATURES
276 Select this to enable optimizations for IBM zBC12 and zEC12 (2828 and
277 2827 series). The kernel will be slightly faster but will not work on
281 bool "IBM z13s and z13"
282 select HAVE_MARCH_Z13_FEATURES
284 Select this to enable optimizations for IBM z13s and z13 (2965 and
285 2964 series). The kernel will be slightly faster but will not work on
289 bool "IBM z14 ZR1 and z14"
290 select HAVE_MARCH_Z14_FEATURES
292 Select this to enable optimizations for IBM z14 ZR1 and z14 (3907
293 and 3906 series). The kernel will be slightly faster but will not
294 work on older machines.
298 config MARCH_Z900_TUNE
299 def_bool TUNE_Z900 || MARCH_Z900 && TUNE_DEFAULT
301 config MARCH_Z990_TUNE
302 def_bool TUNE_Z990 || MARCH_Z990 && TUNE_DEFAULT
304 config MARCH_Z9_109_TUNE
305 def_bool TUNE_Z9_109 || MARCH_Z9_109 && TUNE_DEFAULT
307 config MARCH_Z10_TUNE
308 def_bool TUNE_Z10 || MARCH_Z10 && TUNE_DEFAULT
310 config MARCH_Z196_TUNE
311 def_bool TUNE_Z196 || MARCH_Z196 && TUNE_DEFAULT
313 config MARCH_ZEC12_TUNE
314 def_bool TUNE_ZEC12 || MARCH_ZEC12 && TUNE_DEFAULT
316 config MARCH_Z13_TUNE
317 def_bool TUNE_Z13 || MARCH_Z13 && TUNE_DEFAULT
319 config MARCH_Z14_TUNE
320 def_bool TUNE_Z14 || MARCH_Z14 && TUNE_DEFAULT
323 prompt "Tune code generation"
326 Cause the compiler to tune (-mtune) the generated code for a machine.
327 This will make the code run faster on the selected machine but
328 somewhat slower on other machines.
329 This option only changes how the compiler emits instructions, not the
330 selection of instructions itself, so the resulting kernel will run on
336 Tune the generated code for the target processor for which the kernel
340 bool "IBM zSeries model z800 and z900"
343 bool "IBM zSeries model z890 and z990"
349 bool "IBM System z10"
352 bool "IBM zEnterprise 114 and 196"
355 bool "IBM zBC12 and zEC12"
370 prompt "Kernel support for 31 bit emulation"
371 select COMPAT_BINFMT_ELF if BINFMT_ELF
372 select ARCH_WANT_OLD_COMPAT_IPC
373 select COMPAT_OLD_SIGACTION
376 Select this option if you want to enable your system kernel to
377 handle system-calls from ELF binaries for 31 bit ESA. This option
378 (and some other stuff like libraries and such) is needed for
379 executing 31 bit applications. It is safe to say "Y".
381 config SYSVIPC_COMPAT
382 def_bool y if COMPAT && SYSVIPC
386 prompt "Symmetric multi-processing support"
388 This enables support for systems with more than one CPU. If you have
389 a system with only one CPU, like most personal computers, say N. If
390 you have a system with more than one CPU, say Y.
392 If you say N here, the kernel will run on uni- and multiprocessor
393 machines, but will use only one CPU of a multiprocessor machine. If
394 you say Y here, the kernel will run on many, but not all,
395 uniprocessor machines. On a uniprocessor machine, the kernel
396 will run faster if you say N here.
398 See also the SMP-HOWTO available at
399 <http://www.tldp.org/docs.html#howto>.
401 Even if you don't know what to do here, say Y.
404 int "Maximum number of CPUs (2-512)"
409 This allows you to specify the maximum number of CPUs which this
410 kernel will support. The maximum supported value is 512 and the
411 minimum value which makes sense is 2.
413 This is purely to save memory - each supported CPU adds
414 approximately sixteen kilobytes to the kernel image.
418 prompt "Support for hot-pluggable CPUs"
421 Say Y here to be able to turn CPUs off and on. CPUs
422 can be controlled through /sys/devices/system/cpu/cpu#.
423 Say N if you want to disable CPU hotplug.
425 # Some NUMA nodes have memory ranges that span
426 # other nodes. Even though a pfn is valid and
427 # between a node's start and end pfns, it may not
428 # reside on that node. See memmap_init_zone()
429 # for details. <- They meant memory holes!
430 config NODES_SPAN_OTHER_NODES
435 depends on SMP && SCHED_TOPOLOGY
440 This option adds NUMA support to the kernel.
442 An operation mode can be selected by appending
443 numa=<method> to the kernel command line.
445 The default behaviour is identical to appending numa=plain to
446 the command line. This will create just one node with all
447 available memory and all CPUs in it.
450 int "Maximum NUMA nodes (as a power of 2)"
455 Specify the maximum number of NUMA nodes available on the target
456 system. Increases memory reserved to accommodate various tables.
458 menu "Select NUMA modes"
462 bool "NUMA emulation"
465 Numa emulation mode will split the available system memory into
466 equal chunks which then are distributed over the configured number
467 of nodes in a round-robin manner.
469 The number of fake nodes is limited by the number of available memory
470 chunks (i.e. memory size / fake size) and the number of supported
473 The CPUs are assigned to the nodes in a way that partially respects
474 the original machine topology (if supported by the machine).
475 Fair distribution of the CPUs is not guaranteed.
478 hex "NUMA emulation memory chunk size"
480 range 0x400000 0x100000000
483 Select the default size by which the memory is chopped and then
484 assigned to emulated NUMA nodes.
486 This can be overridden by specifying
490 on the kernel command line where also suffixes K, M, G, and T are
507 config SCHED_TOPOLOGY
509 prompt "Topology scheduler support"
516 Topology scheduler support improves the CPU scheduler's decision
517 making when dealing with machines that have multi-threading,
518 multiple cores or multiple books.
520 source kernel/Kconfig.preempt
522 source kernel/Kconfig.hz
529 bool "kexec file based system call"
533 depends on CRYPTO_SHA256
534 depends on CRYPTO_SHA256_S390
536 Enable the kexec file based system call. In contrast to the normal
537 kexec system call this system call takes file descriptors for the
538 kernel and initramfs as arguments.
540 config ARCH_HAS_KEXEC_PURGATORY
542 depends on KEXEC_FILE
546 prompt "s390 architectural random number generation API"
548 Enable the s390 architectural random number generation API
549 to provide random data for all consumers within the Linux
552 When enabled the arch_random_* functions declared in linux/random.h
553 are implemented. The implementation is based on the s390 CPACF
554 instruction subfunction TRNG which provides a real true random
561 prompt "Enable modified branch prediction for the kernel by default"
563 If this option is selected the kernel will switch to a modified
564 branch prediction mode if the firmware interface is available.
565 The modified branch prediction mode improves the behaviour in
566 regard to speculative execution.
568 With the option enabled the kernel parameter "nobp=0" or "nospec"
569 can be used to run the kernel in the normal branch prediction mode.
571 With the option disabled the modified branch prediction mode is
572 enabled with the "nobp=1" kernel parameter.
578 prompt "Avoid speculative indirect branches in the kernel"
580 Compile the kernel with the expoline compiler options to guard
581 against kernel-to-user data leaks by avoiding speculative indirect
583 Requires a compiler with -mindirect-branch=thunk support for full
584 protection. The kernel may run slower.
589 prompt "Expoline default"
591 default EXPOLINE_FULL
594 bool "spectre_v2=off"
597 bool "spectre_v2=auto"
608 config ARCH_SPARSEMEM_ENABLE
610 select SPARSEMEM_VMEMMAP_ENABLE
611 select SPARSEMEM_VMEMMAP
613 config ARCH_SPARSEMEM_DEFAULT
616 config ARCH_SELECT_MEMORY_MODEL
619 config ARCH_ENABLE_MEMORY_HOTPLUG
620 def_bool y if SPARSEMEM
622 config ARCH_ENABLE_MEMORY_HOTREMOVE
625 config ARCH_ENABLE_SPLIT_PMD_PTLOCK
628 config FORCE_MAX_ZONEORDER
634 config MAX_PHYSMEM_BITS
635 int "Maximum size of supported physical memory in bits (42-53)"
639 This option specifies the maximum supported size of physical memory
640 in bits. Supported is any size between 2^42 (4TB) and 2^53 (8PB).
641 Increasing the number of bits also increases the kernel image size.
642 By default 46 bits (64TB) are supported.
646 prompt "Pack kernel stack"
648 This option enables the compiler option -mkernel-backchain if it
649 is available. If the option is available the compiler supports
650 the new stack layout which dramatically reduces the minimum stack
651 frame size. With an old compiler a non-leaf function needs a
652 minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
653 -mkernel-backchain the minimum size drops to 16 byte on 31 bit
654 and 24 byte on 64 bit.
656 Say Y if you are unsure.
660 prompt "Detect kernel stack overflow"
662 This option enables the compiler option -mstack-guard and
663 -mstack-size if they are available. If the compiler supports them
664 it will emit additional code to each function prolog to trigger
665 an illegal operation if the kernel stack is about to overflow.
667 Say N if you are unsure.
670 int "Size of the guard area (128-1024)"
672 depends on CHECK_STACK
675 This allows you to specify the size of the guard area at the lower
676 end of the kernel stack. If the kernel stack points into the guard
677 area on function entry an illegal operation is triggered. The size
678 needs to be a power of 2. Please keep in mind that the size of an
679 interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
680 The minimum size for the stack guard should be 256 for 31 bit and
683 config WARN_DYNAMIC_STACK
685 prompt "Emit compiler warnings for function with dynamic stack usage"
687 This option enables the compiler option -mwarn-dynamicstack. If the
688 compiler supports this options generates warnings for functions
689 that dynamically allocate stack space using alloca.
691 Say N if you are unsure.
699 prompt "QDIO support"
701 This driver provides the Queued Direct I/O base support for
704 To compile this driver as a module, choose M here: the
705 module will be called qdio.
718 config PCI_NR_FUNCTIONS
719 int "Maximum number of PCI functions (1-4096)"
723 This allows you to specify the maximum number of PCI functions which
724 this kernel will support.
726 source "drivers/pci/Kconfig"
739 config NEED_SG_DMA_LENGTH
742 config NEED_DMA_MAP_STATE
747 prompt "Support for CHSC subchannels"
749 This driver allows usage of CHSC subchannels. A CHSC subchannel
750 is usually present on LPAR only.
751 The driver creates a device /dev/chsc, which may be used to
752 obtain I/O configuration information about the machine and
753 to issue asynchronous chsc commands (DANGEROUS).
754 You will usually only want to use this interface on a special
755 LPAR designated for system management.
757 To compile this driver as a module, choose M here: the
758 module will be called chsc_sch.
764 prompt "SCM bus driver"
766 Bus driver for Storage Class Memory.
770 prompt "Support for EADM subchannels"
773 This driver allows usage of EADM subchannels. EADM subchannels act
774 as a communication vehicle for SCM increments.
776 To compile this driver as a module, choose M here: the
777 module will be called eadm_sch.
781 prompt "Support for VFIO-CCW subchannels"
782 depends on S390_CCW_IOMMU && VFIO_MDEV
784 This driver allows usage of I/O subchannels via VFIO-CCW.
786 To compile this driver as a module, choose M here: the
787 module will be called vfio_ccw.
794 bool "kernel crash dumps"
798 Generate crash dump after being started by kexec.
799 Crash dump kernels are loaded in the main kernel with kexec-tools
800 into a specially reserved region and then later executed after
801 a crash by kdump/kexec.
802 Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this.
803 This option also enables s390 zfcpdump.
804 See also <file:Documentation/s390/zfcpdump.txt>
808 menu "Executable file formats / Emulations"
810 source "fs/Kconfig.binfmt"
814 prompt "Enable seccomp to safely compute untrusted bytecode"
817 This kernel feature is useful for number crunching applications
818 that may need to compute untrusted bytecode during their
819 execution. By using pipes or other transports made available to
820 the process as file descriptors supporting the read/write
821 syscalls, it's possible to isolate those applications in
822 their own address space using seccomp. Once seccomp is
823 enabled via /proc/<pid>/seccomp, it cannot be disabled
824 and the task is only allowed to execute a few safe syscalls
825 defined by each seccomp mode.
831 menu "Power Management"
833 config ARCH_HIBERNATION_POSSIBLE
836 source "kernel/power/Kconfig"
848 source "drivers/Kconfig"
852 source "arch/s390/Kconfig.debug"
854 source "security/Kconfig"
856 source "crypto/Kconfig"
860 menu "Virtualization"
864 prompt "Pseudo page fault support"
866 Select this option, if you want to use PFAULT pseudo page fault
867 handling under VM. If running native or in LPAR, this option
868 has no effect. If your VM does not support PFAULT, PAGEEX
869 pseudo page fault handling will be used.
870 Note that VM 4.2 supports PFAULT but has a bug in its
871 implementation that causes some problems.
872 Everybody who wants to run Linux under VM != VM4.2 should select
877 prompt "Cooperative memory management"
879 Select this option, if you want to enable the kernel interface
880 to reduce the memory size of the system. This is accomplished
881 by allocating pages of memory and put them "on hold". This only
882 makes sense for a system running under VM where the unused pages
883 will be reused by VM for other guest systems. The interface
884 allows an external monitor to balance memory of many systems.
885 Everybody who wants to run Linux under VM should select this
890 prompt "IUCV special message interface to cooperative memory management"
891 depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
893 Select this option to enable the special message interface to
894 the cooperative memory management.
898 prompt "Linux - VM Monitor Stream, base infrastructure"
901 This provides a kernel interface for creating and updating z/VM APPLDATA
902 monitor records. The monitor records are updated at certain time
903 intervals, once the timer is started.
904 Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
905 i.e. enables or disables monitoring on the Linux side.
906 A custom interval value (in seconds) can be written to
907 /proc/appldata/interval.
909 Defaults are 60 seconds interval and timer off.
910 The /proc entries can also be read from, showing the current settings.
914 prompt "Monitor memory management statistics"
915 depends on APPLDATA_BASE && VM_EVENT_COUNTERS
917 This provides memory management related data to the Linux - VM Monitor
918 Stream, like paging/swapping rate, memory utilisation, etc.
919 Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
920 APPLDATA monitor record, i.e. enables or disables monitoring this record
924 The /proc entry can also be read from, showing the current settings.
926 This can also be compiled as a module, which will be called
931 prompt "Monitor OS statistics"
932 depends on APPLDATA_BASE
934 This provides OS related data to the Linux - VM Monitor Stream, like
935 CPU utilisation, etc.
936 Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
937 APPLDATA monitor record, i.e. enables or disables monitoring this record
941 This can also be compiled as a module, which will be called
944 config APPLDATA_NET_SUM
946 prompt "Monitor overall network statistics"
947 depends on APPLDATA_BASE && NET
949 This provides network related data to the Linux - VM Monitor Stream,
950 currently there is only a total sum of network I/O statistics, no
952 Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
953 APPLDATA monitor record, i.e. enables or disables monitoring this record
957 This can also be compiled as a module, which will be called
962 prompt "s390 hypervisor file system support"
963 select SYS_HYPERVISOR
965 This is a virtual file system intended to provide accounting
966 information in an s390 hypervisor environment.
968 source "arch/s390/kvm/Kconfig"
972 prompt "s390 support for virtio devices"
974 select VIRTUALIZATION
976 select VIRTIO_CONSOLE
978 Enabling this option adds support for virtio based paravirtual device
981 Select this option if you want to run the kernel as a guest under