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 GENERIC_LOCKBREAK
39 def_bool y if SMP && PREEMPT
44 config ARCH_SUPPORTS_DEBUG_PAGEALLOC
56 config ARCH_SUPPORTS_UPROBES
61 select ARCH_BINFMT_ELF_STATE
62 select ARCH_HAS_DEVMEM_IS_ALLOWED
63 select ARCH_HAS_ELF_RANDOMIZE
64 select ARCH_HAS_FORTIFY_SOURCE
65 select ARCH_HAS_GCOV_PROFILE_ALL
66 select ARCH_HAS_GIGANTIC_PAGE if (MEMORY_ISOLATION && COMPACTION) || CMA
68 select ARCH_HAS_PTE_SPECIAL
69 select ARCH_HAS_SET_MEMORY
70 select ARCH_HAS_SG_CHAIN
71 select ARCH_HAS_STRICT_KERNEL_RWX
72 select ARCH_HAS_STRICT_MODULE_RWX
73 select ARCH_HAS_UBSAN_SANITIZE_ALL
74 select ARCH_HAVE_NMI_SAFE_CMPXCHG
75 select ARCH_INLINE_READ_LOCK
76 select ARCH_INLINE_READ_LOCK_BH
77 select ARCH_INLINE_READ_LOCK_IRQ
78 select ARCH_INLINE_READ_LOCK_IRQSAVE
79 select ARCH_INLINE_READ_TRYLOCK
80 select ARCH_INLINE_READ_UNLOCK
81 select ARCH_INLINE_READ_UNLOCK_BH
82 select ARCH_INLINE_READ_UNLOCK_IRQ
83 select ARCH_INLINE_READ_UNLOCK_IRQRESTORE
84 select ARCH_INLINE_SPIN_LOCK
85 select ARCH_INLINE_SPIN_LOCK_BH
86 select ARCH_INLINE_SPIN_LOCK_IRQ
87 select ARCH_INLINE_SPIN_LOCK_IRQSAVE
88 select ARCH_INLINE_SPIN_TRYLOCK
89 select ARCH_INLINE_SPIN_TRYLOCK_BH
90 select ARCH_INLINE_SPIN_UNLOCK
91 select ARCH_INLINE_SPIN_UNLOCK_BH
92 select ARCH_INLINE_SPIN_UNLOCK_IRQ
93 select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE
94 select ARCH_INLINE_WRITE_LOCK
95 select ARCH_INLINE_WRITE_LOCK_BH
96 select ARCH_INLINE_WRITE_LOCK_IRQ
97 select ARCH_INLINE_WRITE_LOCK_IRQSAVE
98 select ARCH_INLINE_WRITE_TRYLOCK
99 select ARCH_INLINE_WRITE_UNLOCK
100 select ARCH_INLINE_WRITE_UNLOCK_BH
101 select ARCH_INLINE_WRITE_UNLOCK_IRQ
102 select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE
103 select ARCH_SAVE_PAGE_KEYS if HIBERNATION
104 select ARCH_SUPPORTS_ATOMIC_RMW
105 select ARCH_SUPPORTS_NUMA_BALANCING
106 select ARCH_USE_BUILTIN_BSWAP
107 select ARCH_USE_CMPXCHG_LOCKREF
108 select ARCH_WANTS_DYNAMIC_TASK_STRUCT
109 select ARCH_WANT_IPC_PARSE_VERSION
110 select BUILDTIME_EXTABLE_SORT
111 select CLONE_BACKWARDS2
112 select DYNAMIC_FTRACE if FUNCTION_TRACER
113 select GENERIC_CLOCKEVENTS
114 select GENERIC_CPU_AUTOPROBE
115 select GENERIC_CPU_DEVICES if !SMP
116 select GENERIC_CPU_VULNERABILITIES
117 select GENERIC_FIND_FIRST_BIT
118 select GENERIC_SMP_IDLE_THREAD
119 select GENERIC_TIME_VSYSCALL
120 select HAVE_ALIGNED_STRUCT_PAGE if SLUB
121 select HAVE_ARCH_AUDITSYSCALL
122 select HAVE_ARCH_JUMP_LABEL
123 select CPU_NO_EFFICIENT_FFS if !HAVE_MARCH_Z9_109_FEATURES
124 select HAVE_ARCH_SECCOMP_FILTER
125 select HAVE_ARCH_SOFT_DIRTY
126 select HAVE_ARCH_TRACEHOOK
127 select HAVE_ARCH_TRANSPARENT_HUGEPAGE
128 select HAVE_EBPF_JIT if PACK_STACK && HAVE_MARCH_Z196_FEATURES
129 select HAVE_CMPXCHG_DOUBLE
130 select HAVE_CMPXCHG_LOCAL
131 select HAVE_COPY_THREAD_TLS
132 select HAVE_DEBUG_KMEMLEAK
133 select HAVE_DMA_CONTIGUOUS
134 select DMA_DIRECT_OPS
135 select HAVE_DYNAMIC_FTRACE
136 select HAVE_DYNAMIC_FTRACE_WITH_REGS
137 select HAVE_EFFICIENT_UNALIGNED_ACCESS
138 select HAVE_FTRACE_MCOUNT_RECORD
139 select HAVE_FUNCTION_GRAPH_TRACER
140 select HAVE_FUNCTION_TRACER
141 select HAVE_FUTEX_CMPXCHG if FUTEX
142 select HAVE_GCC_PLUGINS if BROKEN
143 select HAVE_KERNEL_BZIP2
144 select HAVE_KERNEL_GZIP
145 select HAVE_KERNEL_LZ4
146 select HAVE_KERNEL_LZMA
147 select HAVE_KERNEL_LZO
148 select HAVE_KERNEL_UNCOMPRESSED
149 select HAVE_KERNEL_XZ
151 select HAVE_KRETPROBES
153 select HAVE_LIVEPATCH
154 select HAVE_PERF_REGS
155 select HAVE_PERF_USER_STACK_DUMP
157 select HAVE_MEMBLOCK_NODE_MAP
158 select HAVE_MEMBLOCK_PHYS_MAP
159 select HAVE_MOD_ARCH_SPECIFIC
161 select HAVE_PERF_EVENTS
162 select HAVE_REGS_AND_STACK_ACCESS_API
164 select HAVE_SYSCALL_TRACEPOINTS
165 select HAVE_VIRT_CPU_ACCOUNTING
166 select MODULES_USE_ELF_RELA
169 select OLD_SIGSUSPEND3
171 select SYSCTL_EXCEPTION_TRACE
172 select THREAD_INFO_IN_TASK
174 select VIRT_CPU_ACCOUNTING
175 select ARCH_HAS_SCALED_CPUTIME
180 config SCHED_OMIT_FRAME_POINTER
183 config PGTABLE_LEVELS
187 source "kernel/livepatch/Kconfig"
189 menu "Processor type and features"
191 config HAVE_MARCH_Z900_FEATURES
194 config HAVE_MARCH_Z990_FEATURES
196 select HAVE_MARCH_Z900_FEATURES
198 config HAVE_MARCH_Z9_109_FEATURES
200 select HAVE_MARCH_Z990_FEATURES
202 config HAVE_MARCH_Z10_FEATURES
204 select HAVE_MARCH_Z9_109_FEATURES
206 config HAVE_MARCH_Z196_FEATURES
208 select HAVE_MARCH_Z10_FEATURES
210 config HAVE_MARCH_ZEC12_FEATURES
212 select HAVE_MARCH_Z196_FEATURES
214 config HAVE_MARCH_Z13_FEATURES
216 select HAVE_MARCH_ZEC12_FEATURES
218 config HAVE_MARCH_Z14_FEATURES
220 select HAVE_MARCH_Z13_FEATURES
223 prompt "Processor type"
227 bool "IBM zSeries model z800 and z900"
228 select HAVE_MARCH_Z900_FEATURES
230 Select this to enable optimizations for model z800/z900 (2064 and
231 2066 series). This will enable some optimizations that are not
232 available on older ESA/390 (31 Bit) only CPUs.
235 bool "IBM zSeries model z890 and z990"
236 select HAVE_MARCH_Z990_FEATURES
238 Select this to enable optimizations for model z890/z990 (2084 and
239 2086 series). The kernel will be slightly faster but will not work
244 select HAVE_MARCH_Z9_109_FEATURES
246 Select this to enable optimizations for IBM System z9 (2094 and
247 2096 series). The kernel will be slightly faster but will not work
251 bool "IBM System z10"
252 select HAVE_MARCH_Z10_FEATURES
254 Select this to enable optimizations for IBM System z10 (2097 and
255 2098 series). The kernel will be slightly faster but will not work
259 bool "IBM zEnterprise 114 and 196"
260 select HAVE_MARCH_Z196_FEATURES
262 Select this to enable optimizations for IBM zEnterprise 114 and 196
263 (2818 and 2817 series). The kernel will be slightly faster but will
264 not work on older machines.
267 bool "IBM zBC12 and zEC12"
268 select HAVE_MARCH_ZEC12_FEATURES
270 Select this to enable optimizations for IBM zBC12 and zEC12 (2828 and
271 2827 series). The kernel will be slightly faster but will not work on
275 bool "IBM z13s and z13"
276 select HAVE_MARCH_Z13_FEATURES
278 Select this to enable optimizations for IBM z13s and z13 (2965 and
279 2964 series). The kernel will be slightly faster but will not work on
283 bool "IBM z14 ZR1 and z14"
284 select HAVE_MARCH_Z14_FEATURES
286 Select this to enable optimizations for IBM z14 ZR1 and z14 (3907
287 and 3906 series). The kernel will be slightly faster but will not
288 work on older machines.
292 config MARCH_Z900_TUNE
293 def_bool TUNE_Z900 || MARCH_Z900 && TUNE_DEFAULT
295 config MARCH_Z990_TUNE
296 def_bool TUNE_Z990 || MARCH_Z990 && TUNE_DEFAULT
298 config MARCH_Z9_109_TUNE
299 def_bool TUNE_Z9_109 || MARCH_Z9_109 && TUNE_DEFAULT
301 config MARCH_Z10_TUNE
302 def_bool TUNE_Z10 || MARCH_Z10 && TUNE_DEFAULT
304 config MARCH_Z196_TUNE
305 def_bool TUNE_Z196 || MARCH_Z196 && TUNE_DEFAULT
307 config MARCH_ZEC12_TUNE
308 def_bool TUNE_ZEC12 || MARCH_ZEC12 && TUNE_DEFAULT
310 config MARCH_Z13_TUNE
311 def_bool TUNE_Z13 || MARCH_Z13 && TUNE_DEFAULT
313 config MARCH_Z14_TUNE
314 def_bool TUNE_Z14 || MARCH_Z14 && TUNE_DEFAULT
317 prompt "Tune code generation"
320 Cause the compiler to tune (-mtune) the generated code for a machine.
321 This will make the code run faster on the selected machine but
322 somewhat slower on other machines.
323 This option only changes how the compiler emits instructions, not the
324 selection of instructions itself, so the resulting kernel will run on
330 Tune the generated code for the target processor for which the kernel
334 bool "IBM zSeries model z800 and z900"
337 bool "IBM zSeries model z890 and z990"
343 bool "IBM System z10"
346 bool "IBM zEnterprise 114 and 196"
349 bool "IBM zBC12 and zEC12"
364 prompt "Kernel support for 31 bit emulation"
365 select COMPAT_BINFMT_ELF if BINFMT_ELF
366 select ARCH_WANT_OLD_COMPAT_IPC
367 select COMPAT_OLD_SIGACTION
370 Select this option if you want to enable your system kernel to
371 handle system-calls from ELF binaries for 31 bit ESA. This option
372 (and some other stuff like libraries and such) is needed for
373 executing 31 bit applications. It is safe to say "Y".
375 config SYSVIPC_COMPAT
376 def_bool y if COMPAT && SYSVIPC
380 prompt "Symmetric multi-processing support"
382 This enables support for systems with more than one CPU. If you have
383 a system with only one CPU, like most personal computers, say N. If
384 you have a system with more than one CPU, say Y.
386 If you say N here, the kernel will run on uni- and multiprocessor
387 machines, but will use only one CPU of a multiprocessor machine. If
388 you say Y here, the kernel will run on many, but not all,
389 uniprocessor machines. On a uniprocessor machine, the kernel
390 will run faster if you say N here.
392 See also the SMP-HOWTO available at
393 <http://www.tldp.org/docs.html#howto>.
395 Even if you don't know what to do here, say Y.
398 int "Maximum number of CPUs (2-512)"
403 This allows you to specify the maximum number of CPUs which this
404 kernel will support. The maximum supported value is 512 and the
405 minimum value which makes sense is 2.
407 This is purely to save memory - each supported CPU adds
408 approximately sixteen kilobytes to the kernel image.
412 prompt "Support for hot-pluggable CPUs"
415 Say Y here to be able to turn CPUs off and on. CPUs
416 can be controlled through /sys/devices/system/cpu/cpu#.
417 Say N if you want to disable CPU hotplug.
419 # Some NUMA nodes have memory ranges that span
420 # other nodes. Even though a pfn is valid and
421 # between a node's start and end pfns, it may not
422 # reside on that node. See memmap_init_zone()
423 # for details. <- They meant memory holes!
424 config NODES_SPAN_OTHER_NODES
429 depends on SMP && SCHED_TOPOLOGY
434 This option adds NUMA support to the kernel.
436 An operation mode can be selected by appending
437 numa=<method> to the kernel command line.
439 The default behaviour is identical to appending numa=plain to
440 the command line. This will create just one node with all
441 available memory and all CPUs in it.
444 int "Maximum NUMA nodes (as a power of 2)"
449 Specify the maximum number of NUMA nodes available on the target
450 system. Increases memory reserved to accommodate various tables.
452 menu "Select NUMA modes"
456 bool "NUMA emulation"
459 Numa emulation mode will split the available system memory into
460 equal chunks which then are distributed over the configured number
461 of nodes in a round-robin manner.
463 The number of fake nodes is limited by the number of available memory
464 chunks (i.e. memory size / fake size) and the number of supported
467 The CPUs are assigned to the nodes in a way that partially respects
468 the original machine topology (if supported by the machine).
469 Fair distribution of the CPUs is not guaranteed.
472 hex "NUMA emulation memory chunk size"
474 range 0x400000 0x100000000
477 Select the default size by which the memory is chopped and then
478 assigned to emulated NUMA nodes.
480 This can be overridden by specifying
484 on the kernel command line where also suffixes K, M, G, and T are
501 config SCHED_TOPOLOGY
503 prompt "Topology scheduler support"
510 Topology scheduler support improves the CPU scheduler's decision
511 making when dealing with machines that have multi-threading,
512 multiple cores or multiple books.
514 source kernel/Kconfig.hz
521 bool "kexec file based system call"
525 depends on CRYPTO_SHA256
526 depends on CRYPTO_SHA256_S390
528 Enable the kexec file based system call. In contrast to the normal
529 kexec system call this system call takes file descriptors for the
530 kernel and initramfs as arguments.
532 config ARCH_HAS_KEXEC_PURGATORY
534 depends on KEXEC_FILE
538 prompt "s390 architectural random number generation API"
540 Enable the s390 architectural random number generation API
541 to provide random data for all consumers within the Linux
544 When enabled the arch_random_* functions declared in linux/random.h
545 are implemented. The implementation is based on the s390 CPACF
546 instruction subfunction TRNG which provides a real true random
553 prompt "Enable modified branch prediction for the kernel by default"
555 If this option is selected the kernel will switch to a modified
556 branch prediction mode if the firmware interface is available.
557 The modified branch prediction mode improves the behaviour in
558 regard to speculative execution.
560 With the option enabled the kernel parameter "nobp=0" or "nospec"
561 can be used to run the kernel in the normal branch prediction mode.
563 With the option disabled the modified branch prediction mode is
564 enabled with the "nobp=1" kernel parameter.
570 prompt "Avoid speculative indirect branches in the kernel"
572 Compile the kernel with the expoline compiler options to guard
573 against kernel-to-user data leaks by avoiding speculative indirect
575 Requires a compiler with -mindirect-branch=thunk support for full
576 protection. The kernel may run slower.
581 prompt "Expoline default"
583 default EXPOLINE_FULL
586 bool "spectre_v2=off"
589 bool "spectre_v2=auto"
600 config ARCH_SPARSEMEM_ENABLE
602 select SPARSEMEM_VMEMMAP_ENABLE
603 select SPARSEMEM_VMEMMAP
605 config ARCH_SPARSEMEM_DEFAULT
608 config ARCH_SELECT_MEMORY_MODEL
611 config ARCH_ENABLE_MEMORY_HOTPLUG
612 def_bool y if SPARSEMEM
614 config ARCH_ENABLE_MEMORY_HOTREMOVE
617 config ARCH_ENABLE_SPLIT_PMD_PTLOCK
620 config FORCE_MAX_ZONEORDER
624 config MAX_PHYSMEM_BITS
625 int "Maximum size of supported physical memory in bits (42-53)"
629 This option specifies the maximum supported size of physical memory
630 in bits. Supported is any size between 2^42 (4TB) and 2^53 (8PB).
631 Increasing the number of bits also increases the kernel image size.
632 By default 46 bits (64TB) are supported.
636 prompt "Pack kernel stack"
638 This option enables the compiler option -mkernel-backchain if it
639 is available. If the option is available the compiler supports
640 the new stack layout which dramatically reduces the minimum stack
641 frame size. With an old compiler a non-leaf function needs a
642 minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
643 -mkernel-backchain the minimum size drops to 16 byte on 31 bit
644 and 24 byte on 64 bit.
646 Say Y if you are unsure.
650 prompt "Detect kernel stack overflow"
652 This option enables the compiler option -mstack-guard and
653 -mstack-size if they are available. If the compiler supports them
654 it will emit additional code to each function prolog to trigger
655 an illegal operation if the kernel stack is about to overflow.
657 Say N if you are unsure.
660 int "Size of the guard area (128-1024)"
662 depends on CHECK_STACK
665 This allows you to specify the size of the guard area at the lower
666 end of the kernel stack. If the kernel stack points into the guard
667 area on function entry an illegal operation is triggered. The size
668 needs to be a power of 2. Please keep in mind that the size of an
669 interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
670 The minimum size for the stack guard should be 256 for 31 bit and
673 config WARN_DYNAMIC_STACK
675 prompt "Emit compiler warnings for function with dynamic stack usage"
677 This option enables the compiler option -mwarn-dynamicstack. If the
678 compiler supports this options generates warnings for functions
679 that dynamically allocate stack space using alloca.
681 Say N if you are unsure.
689 prompt "QDIO support"
691 This driver provides the Queued Direct I/O base support for
694 To compile this driver as a module, choose M here: the
695 module will be called qdio.
704 select NEED_DMA_MAP_STATE
705 select NEED_SG_DMA_LENGTH
712 config PCI_NR_FUNCTIONS
713 int "Maximum number of PCI functions (1-4096)"
717 This allows you to specify the maximum number of PCI functions which
718 this kernel will support.
720 source "drivers/pci/Kconfig"
732 prompt "Support for CHSC subchannels"
734 This driver allows usage of CHSC subchannels. A CHSC subchannel
735 is usually present on LPAR only.
736 The driver creates a device /dev/chsc, which may be used to
737 obtain I/O configuration information about the machine and
738 to issue asynchronous chsc commands (DANGEROUS).
739 You will usually only want to use this interface on a special
740 LPAR designated for system management.
742 To compile this driver as a module, choose M here: the
743 module will be called chsc_sch.
749 prompt "SCM bus driver"
751 Bus driver for Storage Class Memory.
755 prompt "Support for EADM subchannels"
758 This driver allows usage of EADM subchannels. EADM subchannels act
759 as a communication vehicle for SCM increments.
761 To compile this driver as a module, choose M here: the
762 module will be called eadm_sch.
766 prompt "Support for VFIO-CCW subchannels"
767 depends on S390_CCW_IOMMU && VFIO_MDEV
769 This driver allows usage of I/O subchannels via VFIO-CCW.
771 To compile this driver as a module, choose M here: the
772 module will be called vfio_ccw.
779 bool "kernel crash dumps"
783 Generate crash dump after being started by kexec.
784 Crash dump kernels are loaded in the main kernel with kexec-tools
785 into a specially reserved region and then later executed after
786 a crash by kdump/kexec.
787 Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this.
788 This option also enables s390 zfcpdump.
789 See also <file:Documentation/s390/zfcpdump.txt>
795 prompt "Enable seccomp to safely compute untrusted bytecode"
798 This kernel feature is useful for number crunching applications
799 that may need to compute untrusted bytecode during their
800 execution. By using pipes or other transports made available to
801 the process as file descriptors supporting the read/write
802 syscalls, it's possible to isolate those applications in
803 their own address space using seccomp. Once seccomp is
804 enabled via /proc/<pid>/seccomp, it cannot be disabled
805 and the task is only allowed to execute a few safe syscalls
806 defined by each seccomp mode.
810 menu "Power Management"
812 config ARCH_HIBERNATION_POSSIBLE
815 source "kernel/power/Kconfig"
827 default (SMC || CCWGROUP)
829 menu "Virtualization"
833 prompt "Pseudo page fault support"
835 Select this option, if you want to use PFAULT pseudo page fault
836 handling under VM. If running native or in LPAR, this option
837 has no effect. If your VM does not support PFAULT, PAGEEX
838 pseudo page fault handling will be used.
839 Note that VM 4.2 supports PFAULT but has a bug in its
840 implementation that causes some problems.
841 Everybody who wants to run Linux under VM != VM4.2 should select
846 prompt "Cooperative memory management"
848 Select this option, if you want to enable the kernel interface
849 to reduce the memory size of the system. This is accomplished
850 by allocating pages of memory and put them "on hold". This only
851 makes sense for a system running under VM where the unused pages
852 will be reused by VM for other guest systems. The interface
853 allows an external monitor to balance memory of many systems.
854 Everybody who wants to run Linux under VM should select this
859 prompt "IUCV special message interface to cooperative memory management"
860 depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
862 Select this option to enable the special message interface to
863 the cooperative memory management.
867 prompt "Linux - VM Monitor Stream, base infrastructure"
870 This provides a kernel interface for creating and updating z/VM APPLDATA
871 monitor records. The monitor records are updated at certain time
872 intervals, once the timer is started.
873 Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
874 i.e. enables or disables monitoring on the Linux side.
875 A custom interval value (in seconds) can be written to
876 /proc/appldata/interval.
878 Defaults are 60 seconds interval and timer off.
879 The /proc entries can also be read from, showing the current settings.
883 prompt "Monitor memory management statistics"
884 depends on APPLDATA_BASE && VM_EVENT_COUNTERS
886 This provides memory management related data to the Linux - VM Monitor
887 Stream, like paging/swapping rate, memory utilisation, etc.
888 Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
889 APPLDATA monitor record, i.e. enables or disables monitoring this record
893 The /proc entry can also be read from, showing the current settings.
895 This can also be compiled as a module, which will be called
900 prompt "Monitor OS statistics"
901 depends on APPLDATA_BASE
903 This provides OS related data to the Linux - VM Monitor Stream, like
904 CPU utilisation, etc.
905 Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
906 APPLDATA monitor record, i.e. enables or disables monitoring this record
910 This can also be compiled as a module, which will be called
913 config APPLDATA_NET_SUM
915 prompt "Monitor overall network statistics"
916 depends on APPLDATA_BASE && NET
918 This provides network related data to the Linux - VM Monitor Stream,
919 currently there is only a total sum of network I/O statistics, no
921 Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
922 APPLDATA monitor record, i.e. enables or disables monitoring this record
926 This can also be compiled as a module, which will be called
931 prompt "s390 hypervisor file system support"
932 select SYS_HYPERVISOR
934 This is a virtual file system intended to provide accounting
935 information in an s390 hypervisor environment.
937 source "arch/s390/kvm/Kconfig"
941 prompt "s390 support for virtio devices"
943 select VIRTUALIZATION
945 select VIRTIO_CONSOLE
947 Enabling this option adds support for virtio based paravirtual device
950 Select this option if you want to run the kernel as a guest under