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 ALTERNATE_USER_ADDRESS_SPACE
59 select ARCH_32BIT_USTAT_F_TINODE
60 select ARCH_BINFMT_ELF_STATE
61 select ARCH_ENABLE_MEMORY_HOTPLUG if SPARSEMEM
62 select ARCH_ENABLE_MEMORY_HOTREMOVE
63 select ARCH_ENABLE_SPLIT_PMD_PTLOCK if PGTABLE_LEVELS > 2
64 select ARCH_HAS_CURRENT_STACK_POINTER
65 select ARCH_HAS_DEBUG_VM_PGTABLE
66 select ARCH_HAS_DEBUG_WX
67 select ARCH_HAS_DEVMEM_IS_ALLOWED
68 select ARCH_HAS_ELF_RANDOMIZE
69 select ARCH_HAS_FORCE_DMA_UNENCRYPTED
70 select ARCH_HAS_FORTIFY_SOURCE
71 select ARCH_HAS_GCOV_PROFILE_ALL
72 select ARCH_HAS_GIGANTIC_PAGE
74 select ARCH_HAS_MEM_ENCRYPT
75 select ARCH_HAS_PTE_SPECIAL
76 select ARCH_HAS_SCALED_CPUTIME
77 select ARCH_HAS_SET_MEMORY
78 select ARCH_HAS_STRICT_KERNEL_RWX
79 select ARCH_HAS_STRICT_MODULE_RWX
80 select ARCH_HAS_SYSCALL_WRAPPER
81 select ARCH_HAS_UBSAN_SANITIZE_ALL
82 select ARCH_HAS_VDSO_DATA
83 select ARCH_HAVE_NMI_SAFE_CMPXCHG
84 select ARCH_INLINE_READ_LOCK
85 select ARCH_INLINE_READ_LOCK_BH
86 select ARCH_INLINE_READ_LOCK_IRQ
87 select ARCH_INLINE_READ_LOCK_IRQSAVE
88 select ARCH_INLINE_READ_TRYLOCK
89 select ARCH_INLINE_READ_UNLOCK
90 select ARCH_INLINE_READ_UNLOCK_BH
91 select ARCH_INLINE_READ_UNLOCK_IRQ
92 select ARCH_INLINE_READ_UNLOCK_IRQRESTORE
93 select ARCH_INLINE_SPIN_LOCK
94 select ARCH_INLINE_SPIN_LOCK_BH
95 select ARCH_INLINE_SPIN_LOCK_IRQ
96 select ARCH_INLINE_SPIN_LOCK_IRQSAVE
97 select ARCH_INLINE_SPIN_TRYLOCK
98 select ARCH_INLINE_SPIN_TRYLOCK_BH
99 select ARCH_INLINE_SPIN_UNLOCK
100 select ARCH_INLINE_SPIN_UNLOCK_BH
101 select ARCH_INLINE_SPIN_UNLOCK_IRQ
102 select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE
103 select ARCH_INLINE_WRITE_LOCK
104 select ARCH_INLINE_WRITE_LOCK_BH
105 select ARCH_INLINE_WRITE_LOCK_IRQ
106 select ARCH_INLINE_WRITE_LOCK_IRQSAVE
107 select ARCH_INLINE_WRITE_TRYLOCK
108 select ARCH_INLINE_WRITE_UNLOCK
109 select ARCH_INLINE_WRITE_UNLOCK_BH
110 select ARCH_INLINE_WRITE_UNLOCK_IRQ
111 select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE
112 select ARCH_STACKWALK
113 select ARCH_SUPPORTS_ATOMIC_RMW
114 select ARCH_SUPPORTS_DEBUG_PAGEALLOC
115 select ARCH_SUPPORTS_HUGETLBFS
116 select ARCH_SUPPORTS_NUMA_BALANCING
117 select ARCH_USE_BUILTIN_BSWAP
118 select ARCH_USE_CMPXCHG_LOCKREF
119 select ARCH_WANTS_DYNAMIC_TASK_STRUCT
120 select ARCH_WANTS_NO_INSTR
121 select ARCH_WANT_DEFAULT_BPF_JIT
122 select ARCH_WANT_IPC_PARSE_VERSION
123 select BUILDTIME_TABLE_SORT
124 select CLONE_BACKWARDS2
125 select DMA_OPS if PCI
126 select DYNAMIC_FTRACE if FUNCTION_TRACER
127 select GENERIC_ALLOCATOR
128 select GENERIC_CPU_AUTOPROBE
129 select GENERIC_CPU_VULNERABILITIES
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 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_GCC_PLUGINS
169 select HAVE_GENERIC_VDSO
170 select HAVE_IOREMAP_PROT if PCI
171 select HAVE_KERNEL_BZIP2
172 select HAVE_KERNEL_GZIP
173 select HAVE_KERNEL_LZ4
174 select HAVE_KERNEL_LZMA
175 select HAVE_KERNEL_LZO
176 select HAVE_KERNEL_UNCOMPRESSED
177 select HAVE_KERNEL_XZ
178 select HAVE_KERNEL_ZSTD
180 select HAVE_KPROBES_ON_FTRACE
181 select HAVE_KRETPROBES
183 select HAVE_LIVEPATCH
184 select HAVE_MEMBLOCK_PHYS_MAP
185 select HAVE_MOD_ARCH_SPECIFIC
187 select HAVE_NOP_MCOUNT
189 select HAVE_PERF_EVENTS
190 select HAVE_PERF_REGS
191 select HAVE_PERF_USER_STACK_DUMP
192 select HAVE_REGS_AND_STACK_ACCESS_API
193 select HAVE_RELIABLE_STACKTRACE
195 select HAVE_SAMPLE_FTRACE_DIRECT
196 select HAVE_SAMPLE_FTRACE_DIRECT_MULTI
197 select HAVE_SOFTIRQ_ON_OWN_STACK
198 select HAVE_SYSCALL_TRACEPOINTS
199 select HAVE_VIRT_CPU_ACCOUNTING
200 select HAVE_VIRT_CPU_ACCOUNTING_IDLE
201 select IOMMU_HELPER if PCI
202 select IOMMU_SUPPORT if PCI
203 select MMU_GATHER_NO_GATHER
204 select MMU_GATHER_RCU_TABLE_FREE
205 select MODULES_USE_ELF_RELA
206 select NEED_DMA_MAP_STATE if PCI
207 select NEED_SG_DMA_LENGTH if PCI
209 select OLD_SIGSUSPEND3
210 select PCI_DOMAINS if PCI
211 select PCI_MSI if PCI
212 select PCI_MSI_ARCH_FALLBACKS if PCI_MSI
215 select SYSCTL_EXCEPTION_TRACE
216 select THREAD_INFO_IN_TASK
217 select TRACE_IRQFLAGS_SUPPORT
219 select VIRT_CPU_ACCOUNTING
221 # Note: keep the above list sorted alphabetically
223 config SCHED_OMIT_FRAME_POINTER
226 config PGTABLE_LEVELS
230 source "kernel/livepatch/Kconfig"
232 menu "Processor type and features"
234 config HAVE_MARCH_Z10_FEATURES
237 config HAVE_MARCH_Z196_FEATURES
239 select HAVE_MARCH_Z10_FEATURES
241 config HAVE_MARCH_ZEC12_FEATURES
243 select HAVE_MARCH_Z196_FEATURES
245 config HAVE_MARCH_Z13_FEATURES
247 select HAVE_MARCH_ZEC12_FEATURES
249 config HAVE_MARCH_Z14_FEATURES
251 select HAVE_MARCH_Z13_FEATURES
253 config HAVE_MARCH_Z15_FEATURES
255 select HAVE_MARCH_Z14_FEATURES
258 prompt "Processor type"
262 bool "IBM System z10"
263 select HAVE_MARCH_Z10_FEATURES
264 depends on $(cc-option,-march=z10)
266 Select this to enable optimizations for IBM System z10 (2097 and 2098
267 series). This is the oldest machine generation currently supported.
270 bool "IBM zEnterprise 114 and 196"
271 select HAVE_MARCH_Z196_FEATURES
272 depends on $(cc-option,-march=z196)
274 Select this to enable optimizations for IBM zEnterprise 114 and 196
275 (2818 and 2817 series). The kernel will be slightly faster but will
276 not work on older machines.
279 bool "IBM zBC12 and zEC12"
280 select HAVE_MARCH_ZEC12_FEATURES
281 depends on $(cc-option,-march=zEC12)
283 Select this to enable optimizations for IBM zBC12 and zEC12 (2828 and
284 2827 series). The kernel will be slightly faster but will not work on
288 bool "IBM z13s and z13"
289 select HAVE_MARCH_Z13_FEATURES
290 depends on $(cc-option,-march=z13)
292 Select this to enable optimizations for IBM z13s and z13 (2965 and
293 2964 series). The kernel will be slightly faster but will not work on
297 bool "IBM z14 ZR1 and z14"
298 select HAVE_MARCH_Z14_FEATURES
299 depends on $(cc-option,-march=z14)
301 Select this to enable optimizations for IBM z14 ZR1 and z14 (3907
302 and 3906 series). The kernel will be slightly faster but will not
303 work on older machines.
307 select HAVE_MARCH_Z15_FEATURES
308 depends on $(cc-option,-march=z15)
310 Select this to enable optimizations for IBM z15 (8562
311 and 8561 series). The kernel will be slightly faster but will not
312 work on older machines.
316 config MARCH_Z10_TUNE
317 def_bool TUNE_Z10 || MARCH_Z10 && TUNE_DEFAULT
319 config MARCH_Z196_TUNE
320 def_bool TUNE_Z196 || MARCH_Z196 && TUNE_DEFAULT
322 config MARCH_ZEC12_TUNE
323 def_bool TUNE_ZEC12 || MARCH_ZEC12 && TUNE_DEFAULT
325 config MARCH_Z13_TUNE
326 def_bool TUNE_Z13 || MARCH_Z13 && TUNE_DEFAULT
328 config MARCH_Z14_TUNE
329 def_bool TUNE_Z14 || MARCH_Z14 && TUNE_DEFAULT
331 config MARCH_Z15_TUNE
332 def_bool TUNE_Z15 || MARCH_Z15 && TUNE_DEFAULT
335 prompt "Tune code generation"
338 Cause the compiler to tune (-mtune) the generated code for a machine.
339 This will make the code run faster on the selected machine but
340 somewhat slower on other machines.
341 This option only changes how the compiler emits instructions, not the
342 selection of instructions itself, so the resulting kernel will run on
348 Tune the generated code for the target processor for which the kernel
352 bool "IBM System z10"
355 bool "IBM zEnterprise 114 and 196"
356 depends on $(cc-option,-mtune=z196)
359 bool "IBM zBC12 and zEC12"
360 depends on $(cc-option,-mtune=zEC12)
363 bool "IBM z13s and z13"
364 depends on $(cc-option,-mtune=z13)
367 bool "IBM z14 ZR1 and z14"
368 depends on $(cc-option,-mtune=z14)
372 depends on $(cc-option,-mtune=z15)
379 config COMMAND_LINE_SIZE
380 int "Maximum size of kernel command line"
384 This allows you to specify the maximum length of the kernel command
389 prompt "Kernel support for 31 bit emulation"
390 select ARCH_WANT_OLD_COMPAT_IPC
391 select COMPAT_OLD_SIGACTION
394 depends on !CC_IS_CLANG
396 Select this option if you want to enable your system kernel to
397 handle system-calls from ELF binaries for 31 bit ESA. This option
398 (and some other stuff like libraries and such) is needed for
399 executing 31 bit applications. It is safe to say "Y".
401 config SYSVIPC_COMPAT
402 def_bool y if COMPAT && SYSVIPC
408 int "Maximum number of CPUs (2-512)"
412 This allows you to specify the maximum number of CPUs which this
413 kernel will support. The maximum supported value is 512 and the
414 minimum value which makes sense is 2.
416 This is purely to save memory - each supported CPU adds
417 approximately sixteen kilobytes to the kernel image.
424 depends on SCHED_TOPOLOGY
429 This option adds NUMA support to the kernel.
448 config SCHED_TOPOLOGY
450 prompt "Topology scheduler support"
456 Topology scheduler support improves the CPU scheduler's decision
457 making when dealing with machines that have multi-threading,
458 multiple cores or multiple books.
460 source "kernel/Kconfig.hz"
467 bool "kexec file based system call"
471 depends on CRYPTO_SHA256
472 depends on CRYPTO_SHA256_S390
474 Enable the kexec file based system call. In contrast to the normal
475 kexec system call this system call takes file descriptors for the
476 kernel and initramfs as arguments.
478 config ARCH_HAS_KEXEC_PURGATORY
480 depends on KEXEC_FILE
483 bool "Verify kernel signature during kexec_file_load() syscall"
484 depends on KEXEC_FILE && MODULE_SIG_FORMAT
486 This option makes kernel signature verification mandatory for
487 the kexec_file_load() syscall.
489 In addition to that option, you need to enable signature
490 verification for the corresponding kernel image type being
491 loaded in order for this to work.
495 prompt "s390 architectural random number generation API"
497 Enable the s390 architectural random number generation API
498 to provide random data for all consumers within the Linux
501 When enabled the arch_random_* functions declared in linux/random.h
502 are implemented. The implementation is based on the s390 CPACF
503 instruction subfunction TRNG which provides a real true random
510 prompt "Enable modified branch prediction for the kernel by default"
512 If this option is selected the kernel will switch to a modified
513 branch prediction mode if the firmware interface is available.
514 The modified branch prediction mode improves the behaviour in
515 regard to speculative execution.
517 With the option enabled the kernel parameter "nobp=0" or "nospec"
518 can be used to run the kernel in the normal branch prediction mode.
520 With the option disabled the modified branch prediction mode is
521 enabled with the "nobp=1" kernel parameter.
527 depends on $(cc-option,-mindirect-branch=thunk)
528 prompt "Avoid speculative indirect branches in the kernel"
530 Compile the kernel with the expoline compiler options to guard
531 against kernel-to-user data leaks by avoiding speculative indirect
533 Requires a compiler with -mindirect-branch=thunk support for full
534 protection. The kernel may run slower.
538 config EXPOLINE_EXTERN
541 depends on CC_IS_GCC && GCC_VERSION >= 110200
542 depends on $(success,$(srctree)/arch/s390/tools/gcc-thunk-extern.sh $(CC))
543 prompt "Generate expolines as extern functions."
545 This option is required for some tooling like kpatch. The kernel is
546 compiled with -mindirect-branch=thunk-extern and requires a newer
552 prompt "Expoline default"
554 default EXPOLINE_FULL
557 bool "spectre_v2=off"
560 bool "spectre_v2=auto"
568 bool "Build a relocatable kernel"
569 select MODULE_REL_CRCS if MODVERSIONS
572 This builds a kernel image that retains relocation information
573 so it can be loaded at an arbitrary address.
574 The kernel is linked as a position-independent executable (PIE)
575 and contains dynamic relocations which are processed early in the
577 The relocations make the kernel image about 15% larger (compressed
578 10%), but are discarded at runtime.
580 config RANDOMIZE_BASE
581 bool "Randomize the address of the kernel image (KASLR)"
582 depends on RELOCATABLE
585 In support of Kernel Address Space Layout Randomization (KASLR),
586 this randomizes the address at which the kernel image is loaded,
587 as a security feature that deters exploit attempts relying on
588 knowledge of the location of kernel internals.
594 config ARCH_SPARSEMEM_ENABLE
596 select SPARSEMEM_VMEMMAP_ENABLE
597 select SPARSEMEM_VMEMMAP
599 config ARCH_SPARSEMEM_DEFAULT
602 config MAX_PHYSMEM_BITS
603 int "Maximum size of supported physical memory in bits (42-53)"
607 This option specifies the maximum supported size of physical memory
608 in bits. Supported is any size between 2^42 (4TB) and 2^53 (8PB).
609 Increasing the number of bits also increases the kernel image size.
610 By default 46 bits (64TB) are supported.
614 depends on !VMAP_STACK
615 prompt "Detect kernel stack overflow"
617 This option enables the compiler option -mstack-guard and
618 -mstack-size if they are available. If the compiler supports them
619 it will emit additional code to each function prolog to trigger
620 an illegal operation if the kernel stack is about to overflow.
622 Say N if you are unsure.
625 int "Size of the guard area (128-1024)"
627 depends on CHECK_STACK
630 This allows you to specify the size of the guard area at the lower
631 end of the kernel stack. If the kernel stack points into the guard
632 area on function entry an illegal operation is triggered. The size
633 needs to be a power of 2. Please keep in mind that the size of an
634 interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
635 The minimum size for the stack guard should be 256 for 31 bit and
644 prompt "QDIO support"
646 This driver provides the Queued Direct I/O base support for
649 To compile this driver as a module, choose M here: the
650 module will be called qdio.
656 config PCI_NR_FUNCTIONS
657 int "Maximum number of PCI functions (1-4096)"
661 This allows you to specify the maximum number of PCI functions which
662 this kernel will support.
671 prompt "Support for CHSC subchannels"
673 This driver allows usage of CHSC subchannels. A CHSC subchannel
674 is usually present on LPAR only.
675 The driver creates a device /dev/chsc, which may be used to
676 obtain I/O configuration information about the machine and
677 to issue asynchronous chsc commands (DANGEROUS).
678 You will usually only want to use this interface on a special
679 LPAR designated for system management.
681 To compile this driver as a module, choose M here: the
682 module will be called chsc_sch.
688 prompt "SCM bus driver"
690 Bus driver for Storage Class Memory.
694 prompt "Support for EADM subchannels"
697 This driver allows usage of EADM subchannels. EADM subchannels act
698 as a communication vehicle for SCM increments.
700 To compile this driver as a module, choose M here: the
701 module will be called eadm_sch.
705 prompt "Support for VFIO-CCW subchannels"
706 depends on S390_CCW_IOMMU && VFIO_MDEV
708 This driver allows usage of I/O subchannels via VFIO-CCW.
710 To compile this driver as a module, choose M here: the
711 module will be called vfio_ccw.
715 prompt "VFIO support for AP devices"
716 depends on S390_AP_IOMMU && VFIO_MDEV && KVM
719 This driver grants access to Adjunct Processor (AP) devices
720 via the VFIO mediated device interface.
722 To compile this driver as a module, choose M here: the module
723 will be called vfio_ap.
730 bool "kernel crash dumps"
733 Generate crash dump after being started by kexec.
734 Crash dump kernels are loaded in the main kernel with kexec-tools
735 into a specially reserved region and then later executed after
736 a crash by kdump/kexec.
737 Refer to <file:Documentation/s390/zfcpdump.rst> for more details on this.
738 This option also enables s390 zfcpdump.
739 See also <file:Documentation/s390/zfcpdump.rst>
748 default (SMC || CCWGROUP)
750 menu "Virtualization"
752 config PROTECTED_VIRTUALIZATION_GUEST
754 prompt "Protected virtualization guest support"
755 select ARCH_HAS_RESTRICTED_VIRTIO_MEMORY_ACCESS
757 Select this option, if you want to be able to run this
758 kernel as a protected virtualization KVM guest.
759 Protected virtualization capable machines have a mini hypervisor
760 located at machine level (an ultravisor). With help of the
761 Ultravisor, KVM will be able to run "protected" VMs, special
762 VMs whose memory and management data are unavailable to KVM.
766 prompt "Pseudo page fault support"
768 Select this option, if you want to use PFAULT pseudo page fault
769 handling under VM. If running native or in LPAR, this option
770 has no effect. If your VM does not support PFAULT, PAGEEX
771 pseudo page fault handling will be used.
772 Note that VM 4.2 supports PFAULT but has a bug in its
773 implementation that causes some problems.
774 Everybody who wants to run Linux under VM != VM4.2 should select
779 prompt "Cooperative memory management"
781 Select this option, if you want to enable the kernel interface
782 to reduce the memory size of the system. This is accomplished
783 by allocating pages of memory and put them "on hold". This only
784 makes sense for a system running under VM where the unused pages
785 will be reused by VM for other guest systems. The interface
786 allows an external monitor to balance memory of many systems.
787 Everybody who wants to run Linux under VM should select this
792 prompt "IUCV special message interface to cooperative memory management"
793 depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
795 Select this option to enable the special message interface to
796 the cooperative memory management.
800 prompt "Linux - VM Monitor Stream, base infrastructure"
801 depends on PROC_SYSCTL
803 This provides a kernel interface for creating and updating z/VM APPLDATA
804 monitor records. The monitor records are updated at certain time
805 intervals, once the timer is started.
806 Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
807 i.e. enables or disables monitoring on the Linux side.
808 A custom interval value (in seconds) can be written to
809 /proc/appldata/interval.
811 Defaults are 60 seconds interval and timer off.
812 The /proc entries can also be read from, showing the current settings.
816 prompt "Monitor memory management statistics"
817 depends on APPLDATA_BASE && VM_EVENT_COUNTERS
819 This provides memory management related data to the Linux - VM Monitor
820 Stream, like paging/swapping rate, memory utilisation, etc.
821 Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
822 APPLDATA monitor record, i.e. enables or disables monitoring this record
826 The /proc entry can also be read from, showing the current settings.
828 This can also be compiled as a module, which will be called
833 prompt "Monitor OS statistics"
834 depends on APPLDATA_BASE
836 This provides OS related data to the Linux - VM Monitor Stream, like
837 CPU utilisation, etc.
838 Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
839 APPLDATA monitor record, i.e. enables or disables monitoring this record
843 This can also be compiled as a module, which will be called
846 config APPLDATA_NET_SUM
848 prompt "Monitor overall network statistics"
849 depends on APPLDATA_BASE && NET
851 This provides network related data to the Linux - VM Monitor Stream,
852 currently there is only a total sum of network I/O statistics, no
854 Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
855 APPLDATA monitor record, i.e. enables or disables monitoring this record
859 This can also be compiled as a module, which will be called
864 prompt "s390 hypervisor file system support"
865 select SYS_HYPERVISOR
867 This is a virtual file system intended to provide accounting
868 information in an s390 hypervisor environment.
870 source "arch/s390/kvm/Kconfig"
874 prompt "s390 support for virtio devices"
876 select VIRTUALIZATION
879 Enabling this option adds support for virtio based paravirtual device
882 Select this option if you want to run the kernel as a guest under
887 config S390_MODULES_SANITY_TEST_HELPERS
892 config S390_UNWIND_SELFTEST
895 default KUNIT_ALL_TESTS
896 prompt "Test unwind functions"
898 This option enables s390 specific stack unwinder testing kernel
899 module. This option is not useful for distributions or general
900 kernels, but only for kernel developers working on architecture code.
902 Say N if you are unsure.
904 config S390_KPROBES_SANITY_TEST
906 prompt "Enable s390 specific kprobes tests"
910 This option enables an s390 specific kprobes test module. This option
911 is not useful for distributions or general kernels, but only for kernel
912 developers working on architecture code.
914 Say N if you are unsure.
916 config S390_MODULES_SANITY_TEST
919 default KUNIT_ALL_TESTS
920 prompt "Enable s390 specific modules tests"
921 select S390_MODULES_SANITY_TEST_HELPERS
923 This option enables an s390 specific modules test. This option is
924 not useful for distributions or general kernels, but only for
925 kernel developers working on architecture code.
927 Say N if you are unsure.