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Greg Kroah-Hartmanb2441312017-11-01 15:07:57 +01001# SPDX-License-Identifier: GPL-2.0
Linus Torvalds1da177e2005-04-16 15:20:36 -07002config MMU
Martin Schwidefsky61d48c22007-05-10 15:46:00 +02003 def_bool y
Linus Torvalds1da177e2005-04-16 15:20:36 -07004
Christoph Lameter66701b12007-02-10 01:43:09 -08005config ZONE_DMA
Heiko Carstens69dbb2f2011-05-26 09:48:31 +02006 def_bool y
Christoph Lameter66701b12007-02-10 01:43:09 -08007
Heiko Carstens2fd92272016-04-14 09:00:27 +02008config CPU_BIG_ENDIAN
9 def_bool y
10
Ingo Molnar2b105ff2006-07-03 00:25:02 -070011config LOCKDEP_SUPPORT
Martin Schwidefsky61d48c22007-05-10 15:46:00 +020012 def_bool y
Ingo Molnar2b105ff2006-07-03 00:25:02 -070013
Heiko Carstens5bdc9b42006-07-03 00:24:41 -070014config STACKTRACE_SUPPORT
Martin Schwidefsky61d48c22007-05-10 15:46:00 +020015 def_bool y
Heiko Carstens5bdc9b42006-07-03 00:24:41 -070016
David Howellsf0d1b0b2006-12-08 02:37:49 -080017config ARCH_HAS_ILOG2_U32
Martin Schwidefsky6f9a3c32011-01-05 12:47:15 +010018 def_bool n
David Howellsf0d1b0b2006-12-08 02:37:49 -080019
20config ARCH_HAS_ILOG2_U64
Martin Schwidefsky6f9a3c32011-01-05 12:47:15 +010021 def_bool n
David Howellsf0d1b0b2006-12-08 02:37:49 -080022
Akinobu Mita7e33db42006-03-26 01:39:34 -080023config GENERIC_HWEIGHT
Martin Schwidefsky61d48c22007-05-10 15:46:00 +020024 def_bool y
Akinobu Mita7e33db42006-03-26 01:39:34 -080025
Heiko Carstensc0007f12007-04-27 16:01:42 +020026config GENERIC_BUG
Martin Schwidefsky6f9a3c32011-01-05 12:47:15 +010027 def_bool y if BUG
Heiko Carstensc0007f12007-04-27 16:01:42 +020028
Heiko Carstens52499f42010-02-26 22:37:44 +010029config GENERIC_BUG_RELATIVE_POINTERS
30 def_bool y
31
Martin Schwidefskyb6b40c52008-02-05 16:50:42 +010032config GENERIC_LOCKBREAK
Martin Schwidefsky6f9a3c32011-01-05 12:47:15 +010033 def_bool y if SMP && PREEMPT
Martin Schwidefskyb6b40c52008-02-05 16:50:42 +010034
Carsten Otte402b0862008-03-25 18:47:10 +010035config PGSTE
Martin Schwidefsky6f9a3c32011-01-05 12:47:15 +010036 def_bool y if KVM
Carsten Otte402b0862008-03-25 18:47:10 +010037
Akinobu Mita6a11f752009-03-31 15:23:17 -070038config ARCH_SUPPORTS_DEBUG_PAGEALLOC
39 def_bool y
40
Jan Glauber843c48f2012-08-27 10:55:18 +020041config AUDIT_ARCH
42 def_bool y
43
Uwe Kleine-Königce816fa2014-04-07 15:39:19 -070044config NO_IOPORT_MAP
Jan Glauberc8717a32012-11-29 14:38:46 +010045 def_bool y
46
47config PCI_QUIRKS
48 def_bool n
49
Jan Willeke2a0a5b22014-09-22 16:39:06 +020050config ARCH_SUPPORTS_UPROBES
Heiko Carstens5a79859a2015-02-12 13:08:27 +010051 def_bool y
Jan Willeke2a0a5b22014-09-22 16:39:06 +020052
Vasily Gorbik5e785962017-11-19 11:39:39 +010053config KASAN_SHADOW_OFFSET
54 hex
55 depends on KASAN
Vasily Gorbik5dff0382017-11-19 11:54:14 +010056 default 0x18000000000000 if KASAN_S390_4_LEVEL_PAGING
Vasily Gorbik5e785962017-11-19 11:39:39 +010057 default 0x30000000000
58
Martin Schwidefsky347a8dc2006-01-06 00:19:28 -080059config S390
Martin Schwidefsky61d48c22007-05-10 15:46:00 +020060 def_bool y
Martin Schwidefsky23fefe12017-06-07 14:10:24 +020061 select ARCH_BINFMT_ELF_STATE
Dan Williams21266be2015-11-19 18:19:29 -080062 select ARCH_HAS_DEVMEM_IS_ALLOWED
Kees Cook2b68f6c2015-04-14 15:48:00 -070063 select ARCH_HAS_ELF_RANDOMIZE
Heiko Carstens79962032017-09-12 13:49:57 +020064 select ARCH_HAS_FORTIFY_SOURCE
Riku Voipio957e3fa2014-12-12 16:57:44 -080065 select ARCH_HAS_GCOV_PROFILE_ALL
Alexandre Ghiti4eb07162019-05-13 17:19:04 -070066 select ARCH_HAS_GIGANTIC_PAGE
Heiko Carstens907fa062016-06-20 14:08:32 +020067 select ARCH_HAS_KCOV
Laurent Dufour3010a5e2018-06-07 17:06:08 -070068 select ARCH_HAS_PTE_SPECIAL
Daniel Borkmannd2852a22017-02-21 16:09:33 +010069 select ARCH_HAS_SET_MEMORY
Laura Abbottad21fc42017-02-06 16:31:57 -080070 select ARCH_HAS_STRICT_KERNEL_RWX
71 select ARCH_HAS_STRICT_MODULE_RWX
Arnd Bergmannaa0d6e72019-01-16 14:15:22 +010072 select ARCH_HAS_SYSCALL_WRAPPER
Christian Borntraegerc42d8c72016-09-12 14:37:20 +020073 select ARCH_HAS_UBSAN_SANITIZE_ALL
Heiko Carstens0e0d04a2013-02-06 10:15:55 +010074 select ARCH_HAVE_NMI_SAFE_CMPXCHG
Thomas Gleixner6beb0002009-11-09 15:21:34 +000075 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
Heiko Carstens0e0d04a2013-02-06 10:15:55 +010079 select ARCH_INLINE_READ_TRYLOCK
Thomas Gleixner6beb0002009-11-09 15:21:34 +000080 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
Heiko Carstens0e0d04a2013-02-06 10:15:55 +010084 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
Thomas Gleixner6beb0002009-11-09 15:21:34 +000094 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
Heiko Carstens0e0d04a2013-02-06 10:15:55 +010098 select ARCH_INLINE_WRITE_TRYLOCK
Thomas Gleixner6beb0002009-11-09 15:21:34 +000099 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
Mike Rapoport350e88b2019-05-13 17:22:59 -0700103 select ARCH_KEEP_MEMBLOCK
Heiko Carstens0e0d04a2013-02-06 10:15:55 +0100104 select ARCH_SAVE_PAGE_KEYS if HIBERNATION
Christian Borntraeger36e7fda2014-08-05 09:57:51 +0200105 select ARCH_SUPPORTS_ATOMIC_RMW
Philipp Hachtmanna763bc82015-05-08 17:40:44 +0200106 select ARCH_SUPPORTS_NUMA_BALANCING
Christian Borntraeger295d8fa2015-10-29 01:16:04 +0100107 select ARCH_USE_BUILTIN_BSWAP
Heiko Carstensefc1d232013-09-05 13:26:17 +0200108 select ARCH_USE_CMPXCHG_LOCKREF
Martin Schwidefsky3f6813b2016-04-01 15:42:15 +0200109 select ARCH_WANTS_DYNAMIC_TASK_STRUCT
Will Deaconc1d7e012012-07-30 14:42:46 -0700110 select ARCH_WANT_IPC_PARSE_VERSION
Heiko Carstens0e0d04a2013-02-06 10:15:55 +0100111 select BUILDTIME_EXTABLE_SORT
112 select CLONE_BACKWARDS2
Heiko Carstens5d6a0162014-08-15 13:16:09 +0200113 select DYNAMIC_FTRACE if FUNCTION_TRACER
Heiko Carstens0e0d04a2013-02-06 10:15:55 +0100114 select GENERIC_CLOCKEVENTS
Hendrik Brueckner8f00b3e2015-02-19 12:22:02 +0100115 select GENERIC_CPU_AUTOPROBE
Heiko Carstens0e0d04a2013-02-06 10:15:55 +0100116 select GENERIC_CPU_DEVICES if !SMP
Martin Schwidefskyd4249862018-03-21 09:38:21 +0100117 select GENERIC_CPU_VULNERABILITIES
Heiko Carstens746479c2013-09-18 11:45:36 +0200118 select GENERIC_FIND_FIRST_BIT
Thomas Gleixnere80e7812012-04-20 13:05:52 +0000119 select GENERIC_SMP_IDLE_THREAD
Martin Schwidefsky79c74ec2013-11-22 10:04:53 +0100120 select GENERIC_TIME_VSYSCALL
Heiko Carstens0e0d04a2013-02-06 10:15:55 +0100121 select HAVE_ALIGNED_STRUCT_PAGE if SLUB
AKASHI Takahiro7a017722014-02-25 18:16:24 +0900122 select HAVE_ARCH_AUDITSYSCALL
Heiko Carstens5a79859a2015-02-12 13:08:27 +0100123 select HAVE_ARCH_JUMP_LABEL
Heiko Carstens13ddb522018-09-18 23:51:44 -0700124 select HAVE_ARCH_JUMP_LABEL_RELATIVE
Vasily Gorbik42db5ed2017-11-17 14:29:13 +0100125 select HAVE_ARCH_KASAN
Zhaoxiu Zengfff7fb02016-05-20 17:03:57 -0700126 select CPU_NO_EFFICIENT_FFS if !HAVE_MARCH_Z9_109_FEATURES
Heiko Carstensc63cb462012-07-31 15:37:13 +0200127 select HAVE_ARCH_SECCOMP_FILTER
Martin Schwidefsky5614dd92015-04-22 14:47:42 +0200128 select HAVE_ARCH_SOFT_DIRTY
Heiko Carstens0e0d04a2013-02-06 10:15:55 +0100129 select HAVE_ARCH_TRACEHOOK
Heiko Carstens5a79859a2015-02-12 13:08:27 +0100130 select HAVE_ARCH_TRANSPARENT_HUGEPAGE
Martin Schwidefskyce3dc442017-09-12 16:37:33 +0200131 select HAVE_ARCH_VMAP_STACK
Daniel Borkmann60777762016-05-13 19:08:28 +0200132 select HAVE_EBPF_JIT if PACK_STACK && HAVE_MARCH_Z196_FEATURES
Heiko Carstens0e0d04a2013-02-06 10:15:55 +0100133 select HAVE_CMPXCHG_DOUBLE
134 select HAVE_CMPXCHG_LOCAL
Heiko Carstensf50c0e62017-02-20 09:38:42 +0100135 select HAVE_COPY_THREAD_TLS
Heiko Carstens0e0d04a2013-02-06 10:15:55 +0100136 select HAVE_DEBUG_KMEMLEAK
Heiko Carstense1231b02016-11-14 13:57:03 +0100137 select HAVE_DMA_CONTIGUOUS
Heiko Carstens5a79859a2015-02-12 13:08:27 +0100138 select HAVE_DYNAMIC_FTRACE
139 select HAVE_DYNAMIC_FTRACE_WITH_REGS
Christian Borntraeger9078a542016-09-12 13:13:38 +0200140 select HAVE_EFFICIENT_UNALIGNED_ACCESS
Vasily Gorbikd983c892018-08-06 15:17:47 +0200141 select HAVE_FENTRY
Heiko Carstens0e0d04a2013-02-06 10:15:55 +0100142 select HAVE_FTRACE_MCOUNT_RECORD
Heiko Carstens5a79859a2015-02-12 13:08:27 +0100143 select HAVE_FUNCTION_GRAPH_TRACER
144 select HAVE_FUNCTION_TRACER
Heiko Carstens03b8c7b2014-03-02 13:09:47 +0100145 select HAVE_FUTEX_CMPXCHG if FUTEX
Heiko Carstensbc00b3e2018-08-14 13:29:11 +0200146 select HAVE_GCC_PLUGINS
Martin Schwidefsky1a420102019-04-23 10:53:21 +0200147 select HAVE_GENERIC_GUP
Heiko Carstens0e0d04a2013-02-06 10:15:55 +0100148 select HAVE_KERNEL_BZIP2
149 select HAVE_KERNEL_GZIP
Heiko Carstens8e2872c2013-07-18 15:18:24 +0200150 select HAVE_KERNEL_LZ4
Heiko Carstens0e0d04a2013-02-06 10:15:55 +0100151 select HAVE_KERNEL_LZMA
152 select HAVE_KERNEL_LZO
Vasily Gorbik89b52022018-06-13 00:00:25 +0200153 select HAVE_KERNEL_UNCOMPRESSED
Heiko Carstens0e0d04a2013-02-06 10:15:55 +0100154 select HAVE_KERNEL_XZ
155 select HAVE_KPROBES
156 select HAVE_KRETPROBES
Heiko Carstens5a79859a2015-02-12 13:08:27 +0100157 select HAVE_KVM
Jiri Slaby21042d42015-03-26 10:10:17 +0100158 select HAVE_LIVEPATCH
Heiko Carstensc33eff62015-06-06 12:44:25 +0200159 select HAVE_PERF_REGS
160 select HAVE_PERF_USER_STACK_DUMP
Heiko Carstens0e0d04a2013-02-06 10:15:55 +0100161 select HAVE_MEMBLOCK_NODE_MAP
Philipp Hachtmann50be6342014-01-29 18:16:01 +0100162 select HAVE_MEMBLOCK_PHYS_MAP
Martin Schwidefsky9de7d832018-09-18 14:51:51 +0200163 select HAVE_MMU_GATHER_NO_GATHER
David Howells786d35d2012-09-28 14:31:03 +0930164 select HAVE_MOD_ARCH_SPECIFIC
Vasily Gorbikd983c892018-08-06 15:17:47 +0200165 select HAVE_NOP_MCOUNT
Heiko Carstens0e0d04a2013-02-06 10:15:55 +0100166 select HAVE_OPROFILE
Christoph Hellwigeb01d422018-11-15 20:05:32 +0100167 select HAVE_PCI
Heiko Carstens0e0d04a2013-02-06 10:15:55 +0100168 select HAVE_PERF_EVENTS
Martin Schwidefsky9de7d832018-09-18 14:51:51 +0200169 select HAVE_RCU_TABLE_FREE
Heiko Carstens0e0d04a2013-02-06 10:15:55 +0100170 select HAVE_REGS_AND_STACK_ACCESS_API
Heiko Carstens9d6d99e2018-06-30 10:54:15 +0200171 select HAVE_RSEQ
Heiko Carstens0e0d04a2013-02-06 10:15:55 +0100172 select HAVE_SYSCALL_TRACEPOINTS
Heiko Carstens0e0d04a2013-02-06 10:15:55 +0100173 select HAVE_VIRT_CPU_ACCOUNTING
Christoph Hellwigeb01d422018-11-15 20:05:32 +0100174 select IOMMU_HELPER if PCI
175 select IOMMU_SUPPORT if PCI
David Howells786d35d2012-09-28 14:31:03 +0930176 select MODULES_USE_ELF_RELA
Christoph Hellwigeb01d422018-11-15 20:05:32 +0100177 select NEED_DMA_MAP_STATE if PCI
178 select NEED_SG_DMA_LENGTH if PCI
Al Viro7eddd992012-12-25 19:26:12 -0500179 select OLD_SIGACTION
Heiko Carstens93bead42013-09-06 10:03:30 +0200180 select OLD_SIGSUSPEND3
Christoph Hellwig2eac9c22018-11-15 20:05:33 +0100181 select PCI_DOMAINS if PCI
Christoph Hellwigeb01d422018-11-15 20:05:32 +0100182 select PCI_MSI if PCI
Sebastian Ottbb98f392016-06-02 14:57:17 +0200183 select SPARSE_IRQ
Heiko Carstens0e0d04a2013-02-06 10:15:55 +0100184 select SYSCTL_EXCEPTION_TRACE
Heiko Carstensd5c352c2016-11-08 11:08:26 +0100185 select THREAD_INFO_IN_TASK
Josh Triplett05634162014-02-26 18:13:06 -0800186 select TTY
Heiko Carstens0e0d04a2013-02-06 10:15:55 +0100187 select VIRT_CPU_ACCOUNTING
Stanislaw Gruszka40565b52016-11-15 03:06:51 +0100188 select ARCH_HAS_SCALED_CPUTIME
Petr Mladek42a0bb32016-05-20 17:00:33 -0700189 select HAVE_NMI
Philipp Hachtmann3a368f72014-03-06 18:25:13 +0100190
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191
Martin Schwidefskyfca3e352009-07-07 16:37:10 +0200192config SCHED_OMIT_FRAME_POINTER
Martin Schwidefsky6f9a3c32011-01-05 12:47:15 +0100193 def_bool y
Martin Schwidefskyfca3e352009-07-07 16:37:10 +0200194
Kirill A. Shutemovc81956c2015-04-14 15:46:00 -0700195config PGTABLE_LEVELS
196 int
Martin Schwidefsky1aea9b32017-04-24 18:19:10 +0200197 default 5
Kirill A. Shutemovc81956c2015-04-14 15:46:00 -0700198
Jiri Slaby21042d42015-03-26 10:10:17 +0100199source "kernel/livepatch/Kconfig"
200
Jan Glauber843c48f2012-08-27 10:55:18 +0200201menu "Processor type and features"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202
Jan Glauber843c48f2012-08-27 10:55:18 +0200203config HAVE_MARCH_Z900_FEATURES
204 def_bool n
205
206config HAVE_MARCH_Z990_FEATURES
207 def_bool n
208 select HAVE_MARCH_Z900_FEATURES
209
210config HAVE_MARCH_Z9_109_FEATURES
211 def_bool n
212 select HAVE_MARCH_Z990_FEATURES
213
214config HAVE_MARCH_Z10_FEATURES
215 def_bool n
216 select HAVE_MARCH_Z9_109_FEATURES
217
218config HAVE_MARCH_Z196_FEATURES
219 def_bool n
220 select HAVE_MARCH_Z10_FEATURES
221
Heiko Carstens991c15052012-11-13 10:26:37 +0200222config HAVE_MARCH_ZEC12_FEATURES
223 def_bool n
224 select HAVE_MARCH_Z196_FEATURES
225
Martin Schwidefskyf8b2dcb2015-01-14 17:50:19 +0100226config HAVE_MARCH_Z13_FEATURES
227 def_bool n
228 select HAVE_MARCH_ZEC12_FEATURES
229
Martin Schwidefsky6997c322017-04-12 14:17:25 +0200230config HAVE_MARCH_Z14_FEATURES
231 def_bool n
232 select HAVE_MARCH_Z13_FEATURES
233
Jan Glauber843c48f2012-08-27 10:55:18 +0200234choice
235 prompt "Processor type"
Martin Schwidefsky7072276e2016-04-18 17:10:16 +0200236 default MARCH_Z196
Jan Glauber843c48f2012-08-27 10:55:18 +0200237
238config MARCH_Z900
239 bool "IBM zSeries model z800 and z900"
Arnd Bergmannc263a4e2019-04-15 10:35:51 +0200240 depends on !CC_IS_CLANG
Heiko Carstens5a79859a2015-02-12 13:08:27 +0100241 select HAVE_MARCH_Z900_FEATURES
Jan Glauber843c48f2012-08-27 10:55:18 +0200242 help
243 Select this to enable optimizations for model z800/z900 (2064 and
244 2066 series). This will enable some optimizations that are not
245 available on older ESA/390 (31 Bit) only CPUs.
246
247config MARCH_Z990
248 bool "IBM zSeries model z890 and z990"
Arnd Bergmannc263a4e2019-04-15 10:35:51 +0200249 depends on !CC_IS_CLANG
Heiko Carstens5a79859a2015-02-12 13:08:27 +0100250 select HAVE_MARCH_Z990_FEATURES
Jan Glauber843c48f2012-08-27 10:55:18 +0200251 help
252 Select this to enable optimizations for model z890/z990 (2084 and
253 2086 series). The kernel will be slightly faster but will not work
254 on older machines.
255
256config MARCH_Z9_109
257 bool "IBM System z9"
Arnd Bergmannc263a4e2019-04-15 10:35:51 +0200258 depends on !CC_IS_CLANG
Heiko Carstens5a79859a2015-02-12 13:08:27 +0100259 select HAVE_MARCH_Z9_109_FEATURES
Jan Glauber843c48f2012-08-27 10:55:18 +0200260 help
261 Select this to enable optimizations for IBM System z9 (2094 and
262 2096 series). The kernel will be slightly faster but will not work
263 on older machines.
264
265config MARCH_Z10
266 bool "IBM System z10"
Heiko Carstens5a79859a2015-02-12 13:08:27 +0100267 select HAVE_MARCH_Z10_FEATURES
Jan Glauber843c48f2012-08-27 10:55:18 +0200268 help
269 Select this to enable optimizations for IBM System z10 (2097 and
270 2098 series). The kernel will be slightly faster but will not work
271 on older machines.
272
273config MARCH_Z196
274 bool "IBM zEnterprise 114 and 196"
Heiko Carstens5a79859a2015-02-12 13:08:27 +0100275 select HAVE_MARCH_Z196_FEATURES
Jan Glauber843c48f2012-08-27 10:55:18 +0200276 help
277 Select this to enable optimizations for IBM zEnterprise 114 and 196
278 (2818 and 2817 series). The kernel will be slightly faster but will
279 not work on older machines.
280
Heiko Carstens991c15052012-11-13 10:26:37 +0200281config MARCH_ZEC12
Heiko Carstens59471222013-07-24 10:35:33 +0200282 bool "IBM zBC12 and zEC12"
Heiko Carstens5a79859a2015-02-12 13:08:27 +0100283 select HAVE_MARCH_ZEC12_FEATURES
Heiko Carstens991c15052012-11-13 10:26:37 +0200284 help
Heiko Carstens59471222013-07-24 10:35:33 +0200285 Select this to enable optimizations for IBM zBC12 and zEC12 (2828 and
286 2827 series). The kernel will be slightly faster but will not work on
287 older machines.
Heiko Carstens991c15052012-11-13 10:26:37 +0200288
Martin Schwidefskyf8b2dcb2015-01-14 17:50:19 +0100289config MARCH_Z13
Heiko Carstensbb3aa612016-02-19 10:46:08 +0100290 bool "IBM z13s and z13"
Heiko Carstens5a79859a2015-02-12 13:08:27 +0100291 select HAVE_MARCH_Z13_FEATURES
Martin Schwidefskyf8b2dcb2015-01-14 17:50:19 +0100292 help
Heiko Carstensbb3aa612016-02-19 10:46:08 +0100293 Select this to enable optimizations for IBM z13s and z13 (2965 and
294 2964 series). The kernel will be slightly faster but will not work on
295 older machines.
Martin Schwidefskyf8b2dcb2015-01-14 17:50:19 +0100296
Martin Schwidefsky6997c322017-04-12 14:17:25 +0200297config MARCH_Z14
Heiko Carstens451239e2018-04-13 14:04:24 +0200298 bool "IBM z14 ZR1 and z14"
Martin Schwidefsky6997c322017-04-12 14:17:25 +0200299 select HAVE_MARCH_Z14_FEATURES
300 help
Heiko Carstens451239e2018-04-13 14:04:24 +0200301 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.
Martin Schwidefsky6997c322017-04-12 14:17:25 +0200304
Jan Glauber843c48f2012-08-27 10:55:18 +0200305endchoice
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306
Heiko Carstens1db9e052013-10-30 12:12:50 +0100307config MARCH_Z900_TUNE
308 def_bool TUNE_Z900 || MARCH_Z900 && TUNE_DEFAULT
309
310config MARCH_Z990_TUNE
311 def_bool TUNE_Z990 || MARCH_Z990 && TUNE_DEFAULT
312
313config MARCH_Z9_109_TUNE
314 def_bool TUNE_Z9_109 || MARCH_Z9_109 && TUNE_DEFAULT
315
316config MARCH_Z10_TUNE
317 def_bool TUNE_Z10 || MARCH_Z10 && TUNE_DEFAULT
318
319config MARCH_Z196_TUNE
320 def_bool TUNE_Z196 || MARCH_Z196 && TUNE_DEFAULT
321
322config MARCH_ZEC12_TUNE
323 def_bool TUNE_ZEC12 || MARCH_ZEC12 && TUNE_DEFAULT
324
Martin Schwidefskyf8b2dcb2015-01-14 17:50:19 +0100325config MARCH_Z13_TUNE
326 def_bool TUNE_Z13 || MARCH_Z13 && TUNE_DEFAULT
327
Martin Schwidefsky6997c322017-04-12 14:17:25 +0200328config MARCH_Z14_TUNE
329 def_bool TUNE_Z14 || MARCH_Z14 && TUNE_DEFAULT
330
Heiko Carstens1db9e052013-10-30 12:12:50 +0100331choice
332 prompt "Tune code generation"
333 default TUNE_DEFAULT
334 help
335 Cause the compiler to tune (-mtune) the generated code for a machine.
336 This will make the code run faster on the selected machine but
337 somewhat slower on other machines.
338 This option only changes how the compiler emits instructions, not the
339 selection of instructions itself, so the resulting kernel will run on
340 all other machines.
341
342config TUNE_DEFAULT
343 bool "Default"
344 help
345 Tune the generated code for the target processor for which the kernel
346 will be compiled.
347
Heiko Carstens1db9e052013-10-30 12:12:50 +0100348config TUNE_Z900
349 bool "IBM zSeries model z800 and z900"
Arnd Bergmannc263a4e2019-04-15 10:35:51 +0200350 depends on !CC_IS_CLANG
Heiko Carstens1db9e052013-10-30 12:12:50 +0100351
352config TUNE_Z990
353 bool "IBM zSeries model z890 and z990"
Arnd Bergmannc263a4e2019-04-15 10:35:51 +0200354 depends on !CC_IS_CLANG
Heiko Carstens1db9e052013-10-30 12:12:50 +0100355
356config TUNE_Z9_109
357 bool "IBM System z9"
Arnd Bergmannc263a4e2019-04-15 10:35:51 +0200358 depends on !CC_IS_CLANG
Heiko Carstens1db9e052013-10-30 12:12:50 +0100359
360config TUNE_Z10
361 bool "IBM System z10"
362
363config TUNE_Z196
364 bool "IBM zEnterprise 114 and 196"
365
366config TUNE_ZEC12
367 bool "IBM zBC12 and zEC12"
368
Martin Schwidefskyf8b2dcb2015-01-14 17:50:19 +0100369config TUNE_Z13
370 bool "IBM z13"
371
Martin Schwidefsky6997c322017-04-12 14:17:25 +0200372config TUNE_Z14
373 bool "IBM z14"
374
Heiko Carstens1db9e052013-10-30 12:12:50 +0100375endchoice
376
Martin Schwidefsky347a8dc2006-01-06 00:19:28 -0800377config 64BIT
Martin Schwidefsky6f9a3c32011-01-05 12:47:15 +0100378 def_bool y
Martin Schwidefskyd9f7a742006-09-28 16:55:39 +0200379
Jan Glauber843c48f2012-08-27 10:55:18 +0200380config COMPAT
381 def_bool y
382 prompt "Kernel support for 31 bit emulation"
Jan Glauber843c48f2012-08-27 10:55:18 +0200383 select COMPAT_BINFMT_ELF if BINFMT_ELF
384 select ARCH_WANT_OLD_COMPAT_IPC
Al Viro7eddd992012-12-25 19:26:12 -0500385 select COMPAT_OLD_SIGACTION
Arnd Bergmannfef747b2019-01-16 14:15:21 +0100386 select HAVE_UID16
Iulia Manda28138932015-04-15 16:16:41 -0700387 depends on MULTIUSER
Jan Glauber843c48f2012-08-27 10:55:18 +0200388 help
389 Select this option if you want to enable your system kernel to
390 handle system-calls from ELF binaries for 31 bit ESA. This option
391 (and some other stuff like libraries and such) is needed for
392 executing 31 bit applications. It is safe to say "Y".
393
Arnd Bergmann96ca7672019-04-08 23:26:15 +0200394config COMPAT_VDSO
395 def_bool COMPAT && !CC_IS_CLANG
396
Jan Glauber843c48f2012-08-27 10:55:18 +0200397config SYSVIPC_COMPAT
398 def_bool y if COMPAT && SYSVIPC
399
Linus Torvalds1da177e2005-04-16 15:20:36 -0700400config SMP
Martin Schwidefsky6f9a3c32011-01-05 12:47:15 +0100401 def_bool y
402 prompt "Symmetric multi-processing support"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700403 ---help---
404 This enables support for systems with more than one CPU. If you have
405 a system with only one CPU, like most personal computers, say N. If
406 you have a system with more than one CPU, say Y.
407
Robert Graffham4a474152014-01-23 15:55:29 -0800408 If you say N here, the kernel will run on uni- and multiprocessor
Linus Torvalds1da177e2005-04-16 15:20:36 -0700409 machines, but will use only one CPU of a multiprocessor machine. If
410 you say Y here, the kernel will run on many, but not all,
Robert Graffham4a474152014-01-23 15:55:29 -0800411 uniprocessor machines. On a uniprocessor machine, the kernel
Linus Torvalds1da177e2005-04-16 15:20:36 -0700412 will run faster if you say N here.
413
Adrian Bunk03502fa2008-02-03 15:50:21 +0200414 See also the SMP-HOWTO available at
415 <http://www.tldp.org/docs.html#howto>.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700416
417 Even if you don't know what to do here, say Y.
418
419config NR_CPUS
Heiko Carstens5c75a0d2015-01-28 16:52:01 +0100420 int "Maximum number of CPUs (2-512)"
421 range 2 512
Linus Torvalds1da177e2005-04-16 15:20:36 -0700422 depends on SMP
Heiko Carstens5a79859a2015-02-12 13:08:27 +0100423 default "64"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700424 help
425 This allows you to specify the maximum number of CPUs which this
Heiko Carstens5c75a0d2015-01-28 16:52:01 +0100426 kernel will support. The maximum supported value is 512 and the
Linus Torvalds1da177e2005-04-16 15:20:36 -0700427 minimum value which makes sense is 2.
428
429 This is purely to save memory - each supported CPU adds
430 approximately sixteen kilobytes to the kernel image.
431
432config HOTPLUG_CPU
Martin Schwidefsky6f9a3c32011-01-05 12:47:15 +0100433 def_bool y
434 prompt "Support for hot-pluggable CPUs"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700435 depends on SMP
Linus Torvalds1da177e2005-04-16 15:20:36 -0700436 help
437 Say Y here to be able to turn CPUs off and on. CPUs
438 can be controlled through /sys/devices/system/cpu/cpu#.
439 Say N if you want to disable CPU hotplug.
440
Philipp Hachtmann3a368f72014-03-06 18:25:13 +0100441# Some NUMA nodes have memory ranges that span
442# other nodes. Even though a pfn is valid and
443# between a node's start and end pfns, it may not
444# reside on that node. See memmap_init_zone()
445# for details. <- They meant memory holes!
446config NODES_SPAN_OTHER_NODES
447 def_bool NUMA
448
449config NUMA
450 bool "NUMA support"
Heiko Carstensc095a942015-12-28 12:53:51 +0100451 depends on SMP && SCHED_TOPOLOGY
Philipp Hachtmann3a368f72014-03-06 18:25:13 +0100452 default n
453 help
454 Enable NUMA support
455
456 This option adds NUMA support to the kernel.
457
458 An operation mode can be selected by appending
459 numa=<method> to the kernel command line.
460
461 The default behaviour is identical to appending numa=plain to
462 the command line. This will create just one node with all
463 available memory and all CPUs in it.
464
465config NODES_SHIFT
466 int "Maximum NUMA nodes (as a power of 2)"
467 range 1 10
468 depends on NUMA
469 default "4"
470 help
471 Specify the maximum number of NUMA nodes available on the target
472 system. Increases memory reserved to accommodate various tables.
473
Michael Holzheuc29a7ba2014-03-06 18:47:21 +0100474menu "Select NUMA modes"
475 depends on NUMA
476
477config NUMA_EMU
478 bool "NUMA emulation"
479 default y
480 help
481 Numa emulation mode will split the available system memory into
482 equal chunks which then are distributed over the configured number
483 of nodes in a round-robin manner.
484
485 The number of fake nodes is limited by the number of available memory
486 chunks (i.e. memory size / fake size) and the number of supported
487 nodes in the kernel.
488
489 The CPUs are assigned to the nodes in a way that partially respects
490 the original machine topology (if supported by the machine).
491 Fair distribution of the CPUs is not guaranteed.
492
493config EMU_SIZE
494 hex "NUMA emulation memory chunk size"
495 default 0x10000000
496 range 0x400000 0x100000000
497 depends on NUMA_EMU
498 help
499 Select the default size by which the memory is chopped and then
500 assigned to emulated NUMA nodes.
501
502 This can be overridden by specifying
503
504 emu_size=<n>
505
506 on the kernel command line where also suffixes K, M, G, and T are
507 supported.
508
509endmenu
510
Heiko Carstens9236b4d2015-12-28 13:20:43 +0100511config SCHED_SMT
512 def_bool n
513
Heiko Carstens8d11e022010-10-29 16:50:37 +0200514config SCHED_MC
Heiko Carstens83a24e32011-12-27 11:27:09 +0100515 def_bool n
Heiko Carstens8d11e022010-10-29 16:50:37 +0200516
Heiko Carstens4cb14bc2010-08-31 10:28:18 +0200517config SCHED_BOOK
Martin Schwidefsky10ad34b2015-01-14 17:52:10 +0100518 def_bool n
519
Heiko Carstensadac0f12016-05-25 10:25:50 +0200520config SCHED_DRAWER
521 def_bool n
522
Martin Schwidefsky10ad34b2015-01-14 17:52:10 +0100523config SCHED_TOPOLOGY
Martin Schwidefsky6f9a3c32011-01-05 12:47:15 +0100524 def_bool y
Martin Schwidefsky10ad34b2015-01-14 17:52:10 +0100525 prompt "Topology scheduler support"
Heiko Carstens83a24e32011-12-27 11:27:09 +0100526 depends on SMP
Martin Schwidefsky10ad34b2015-01-14 17:52:10 +0100527 select SCHED_SMT
Heiko Carstens83a24e32011-12-27 11:27:09 +0100528 select SCHED_MC
Martin Schwidefsky10ad34b2015-01-14 17:52:10 +0100529 select SCHED_BOOK
Heiko Carstensadac0f12016-05-25 10:25:50 +0200530 select SCHED_DRAWER
Heiko Carstens4cb14bc2010-08-31 10:28:18 +0200531 help
Martin Schwidefsky10ad34b2015-01-14 17:52:10 +0100532 Topology scheduler support improves the CPU scheduler's decision
533 making when dealing with machines that have multi-threading,
534 multiple cores or multiple books.
Heiko Carstens4cb14bc2010-08-31 10:28:18 +0200535
Masahiro Yamada8636a1f2018-12-11 20:01:04 +0900536source "kernel/Kconfig.hz"
Jan Glauber843c48f2012-08-27 10:55:18 +0200537
Philipp Rudobdea9f62018-03-27 13:14:12 +0200538config KEXEC
539 def_bool y
540 select KEXEC_CORE
541
542config KEXEC_FILE
543 bool "kexec file based system call"
544 select KEXEC_CORE
545 select BUILD_BIN2C
546 depends on CRYPTO
547 depends on CRYPTO_SHA256
548 depends on CRYPTO_SHA256_S390
549 help
550 Enable the kexec file based system call. In contrast to the normal
551 kexec system call this system call takes file descriptors for the
552 kernel and initramfs as arguments.
553
554config ARCH_HAS_KEXEC_PURGATORY
555 def_bool y
556 depends on KEXEC_FILE
557
Philipp Rudoe23a8022019-02-26 10:50:39 +0100558config KEXEC_VERIFY_SIG
559 bool "Verify kernel signature during kexec_file_load() syscall"
560 depends on KEXEC_FILE && SYSTEM_DATA_VERIFICATION
561 help
562 This option makes kernel signature verification mandatory for
563 the kexec_file_load() syscall.
564
565 In addition to that option, you need to enable signature
566 verification for the corresponding kernel image type being
567 loaded in order for this to work.
568
Harald Freudenberger4c637cd2017-03-17 10:46:31 +0100569config ARCH_RANDOM
570 def_bool y
571 prompt "s390 architectural random number generation API"
572 help
573 Enable the s390 architectural random number generation API
574 to provide random data for all consumers within the Linux
575 kernel.
576
577 When enabled the arch_random_* functions declared in linux/random.h
578 are implemented. The implementation is based on the s390 CPACF
579 instruction subfunction TRNG which provides a real true random
580 number generator.
581
582 If unsure, say Y.
583
Martin Schwidefskyd768bd82018-01-16 07:11:45 +0100584config KERNEL_NOBP
585 def_bool n
586 prompt "Enable modified branch prediction for the kernel by default"
587 help
588 If this option is selected the kernel will switch to a modified
589 branch prediction mode if the firmware interface is available.
590 The modified branch prediction mode improves the behaviour in
591 regard to speculative execution.
592
593 With the option enabled the kernel parameter "nobp=0" or "nospec"
594 can be used to run the kernel in the normal branch prediction mode.
595
596 With the option disabled the modified branch prediction mode is
597 enabled with the "nobp=1" kernel parameter.
598
599 If unsure, say N.
600
Martin Schwidefskyf19fbd52018-01-26 12:46:47 +0100601config EXPOLINE
602 def_bool n
603 prompt "Avoid speculative indirect branches in the kernel"
604 help
605 Compile the kernel with the expoline compiler options to guard
606 against kernel-to-user data leaks by avoiding speculative indirect
607 branches.
608 Requires a compiler with -mindirect-branch=thunk support for full
609 protection. The kernel may run slower.
610
611 If unsure, say N.
612
613choice
614 prompt "Expoline default"
615 depends on EXPOLINE
616 default EXPOLINE_FULL
617
618config EXPOLINE_OFF
619 bool "spectre_v2=off"
620
Martin Schwidefsky6e179d62018-03-23 13:04:49 +0100621config EXPOLINE_AUTO
Martin Schwidefskyf19fbd52018-01-26 12:46:47 +0100622 bool "spectre_v2=auto"
623
624config EXPOLINE_FULL
625 bool "spectre_v2=on"
626
627endchoice
628
Gerald Schaefer805bc0b2019-02-03 21:35:45 +0100629config RELOCATABLE
630 bool "Build a relocatable kernel"
631 select MODULE_REL_CRCS if MODVERSIONS
632 default y
633 help
634 This builds a kernel image that retains relocation information
635 so it can be loaded at an arbitrary address.
636 The kernel is linked as a position-independent executable (PIE)
637 and contains dynamic relocations which are processed early in the
638 bootup process.
639 The relocations make the kernel image about 15% larger (compressed
640 10%), but are discarded at runtime.
641
Gerald Schaeferb2d24b92019-02-03 21:37:20 +0100642config RANDOMIZE_BASE
643 bool "Randomize the address of the kernel image (KASLR)"
644 depends on RELOCATABLE
645 default y
646 help
647 In support of Kernel Address Space Layout Randomization (KASLR),
648 this randomizes the address at which the kernel image is loaded,
649 as a security feature that deters exploit attempts relying on
650 knowledge of the location of kernel internals.
651
Jan Glauber843c48f2012-08-27 10:55:18 +0200652endmenu
653
654menu "Memory setup"
655
656config ARCH_SPARSEMEM_ENABLE
Martin Schwidefsky6f9a3c32011-01-05 12:47:15 +0100657 def_bool y
Jan Glauber843c48f2012-08-27 10:55:18 +0200658 select SPARSEMEM_VMEMMAP_ENABLE
659 select SPARSEMEM_VMEMMAP
Linus Torvalds1da177e2005-04-16 15:20:36 -0700660
Jan Glauber843c48f2012-08-27 10:55:18 +0200661config ARCH_SPARSEMEM_DEFAULT
Martin Schwidefsky6f9a3c32011-01-05 12:47:15 +0100662 def_bool y
Al Viroe65e1fc2006-09-12 03:04:40 -0400663
Jan Glauber843c48f2012-08-27 10:55:18 +0200664config ARCH_SELECT_MEMORY_MODEL
665 def_bool y
Heiko Carstens05445162012-05-14 10:12:41 +0200666
Jan Glauber843c48f2012-08-27 10:55:18 +0200667config ARCH_ENABLE_MEMORY_HOTPLUG
668 def_bool y if SPARSEMEM
Heiko Carstens05445162012-05-14 10:12:41 +0200669
Jan Glauber843c48f2012-08-27 10:55:18 +0200670config ARCH_ENABLE_MEMORY_HOTREMOVE
671 def_bool y
Heiko Carstens05445162012-05-14 10:12:41 +0200672
Martin Schwidefskyec66ad62014-02-12 14:16:18 +0100673config ARCH_ENABLE_SPLIT_PMD_PTLOCK
674 def_bool y
Martin Schwidefskyec66ad62014-02-12 14:16:18 +0100675
Jan Glauber843c48f2012-08-27 10:55:18 +0200676config FORCE_MAX_ZONEORDER
677 int
678 default "9"
Heiko Carstens05445162012-05-14 10:12:41 +0200679
Heiko Carstensb8402b92017-03-27 15:36:20 +0200680config MAX_PHYSMEM_BITS
681 int "Maximum size of supported physical memory in bits (42-53)"
682 range 42 53
683 default "46"
684 help
685 This option specifies the maximum supported size of physical memory
686 in bits. Supported is any size between 2^42 (4TB) and 2^53 (8PB).
687 Increasing the number of bits also increases the kernel image size.
688 By default 46 bits (64TB) are supported.
689
Linus Torvalds1da177e2005-04-16 15:20:36 -0700690config PACK_STACK
Martin Schwidefsky6f9a3c32011-01-05 12:47:15 +0100691 def_bool y
692 prompt "Pack kernel stack"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700693 help
694 This option enables the compiler option -mkernel-backchain if it
695 is available. If the option is available the compiler supports
696 the new stack layout which dramatically reduces the minimum stack
697 frame size. With an old compiler a non-leaf function needs a
698 minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
699 -mkernel-backchain the minimum size drops to 16 byte on 31 bit
700 and 24 byte on 64 bit.
701
702 Say Y if you are unsure.
703
Linus Torvalds1da177e2005-04-16 15:20:36 -0700704config CHECK_STACK
Martin Schwidefsky6f9a3c32011-01-05 12:47:15 +0100705 def_bool y
Martin Schwidefskyce3dc442017-09-12 16:37:33 +0200706 depends on !VMAP_STACK
Martin Schwidefsky6f9a3c32011-01-05 12:47:15 +0100707 prompt "Detect kernel stack overflow"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700708 help
709 This option enables the compiler option -mstack-guard and
710 -mstack-size if they are available. If the compiler supports them
711 it will emit additional code to each function prolog to trigger
712 an illegal operation if the kernel stack is about to overflow.
713
714 Say N if you are unsure.
715
716config STACK_GUARD
717 int "Size of the guard area (128-1024)"
718 range 128 1024
719 depends on CHECK_STACK
720 default "256"
721 help
722 This allows you to specify the size of the guard area at the lower
723 end of the kernel stack. If the kernel stack points into the guard
724 area on function entry an illegal operation is triggered. The size
725 needs to be a power of 2. Please keep in mind that the size of an
726 interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
727 The minimum size for the stack guard should be 256 for 31 bit and
728 512 for 64 bit.
729
Jan Glauber2c190da2011-03-15 17:08:19 +0100730config WARN_DYNAMIC_STACK
Martin Schwidefsky6f9a3c32011-01-05 12:47:15 +0100731 def_bool n
Jan Glauber2c190da2011-03-15 17:08:19 +0100732 prompt "Emit compiler warnings for function with dynamic stack usage"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700733 help
Jan Glauber2c190da2011-03-15 17:08:19 +0100734 This option enables the compiler option -mwarn-dynamicstack. If the
735 compiler supports this options generates warnings for functions
736 that dynamically allocate stack space using alloca.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700737
738 Say N if you are unsure.
739
Jan Glauber843c48f2012-08-27 10:55:18 +0200740endmenu
Martin Schwidefsky61d48c22007-05-10 15:46:00 +0200741
Jan Glauber843c48f2012-08-27 10:55:18 +0200742menu "I/O subsystem"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700743
Linus Torvalds1da177e2005-04-16 15:20:36 -0700744config QDIO
Martin Schwidefsky6f9a3c32011-01-05 12:47:15 +0100745 def_tristate y
746 prompt "QDIO support"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700747 ---help---
Frank Pavlic8129ee12006-01-06 00:19:20 -0800748 This driver provides the Queued Direct I/O base support for
Ursula Braunefca13b2008-04-17 07:46:19 +0200749 IBM System z.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700750
751 To compile this driver as a module, choose M here: the
752 module will be called qdio.
753
754 If unsure, say Y.
755
Jan Glauberc8717a32012-11-29 14:38:46 +0100756if PCI
757
758config PCI_NR_FUNCTIONS
759 int "Maximum number of PCI functions (1-4096)"
760 range 1 4096
Sebastian Ottb18601b2017-03-27 19:09:15 +0200761 default "128"
Jan Glauberc8717a32012-11-29 14:38:46 +0100762 help
763 This allows you to specify the maximum number of PCI functions which
764 this kernel will support.
765
Jan Glauberc8717a32012-11-29 14:38:46 +0100766endif # PCI
767
Jan Glauberc8717a32012-11-29 14:38:46 +0100768config HAS_IOMEM
769 def_bool PCI
770
Cornelia Huck9d92a7e2008-07-14 09:59:05 +0200771config CHSC_SCH
Sebastian Ottd9c11b12011-01-31 11:30:09 +0100772 def_tristate m
Martin Schwidefsky6f9a3c32011-01-05 12:47:15 +0100773 prompt "Support for CHSC subchannels"
Cornelia Huck9d92a7e2008-07-14 09:59:05 +0200774 help
775 This driver allows usage of CHSC subchannels. A CHSC subchannel
776 is usually present on LPAR only.
777 The driver creates a device /dev/chsc, which may be used to
778 obtain I/O configuration information about the machine and
779 to issue asynchronous chsc commands (DANGEROUS).
780 You will usually only want to use this interface on a special
781 LPAR designated for system management.
782
783 To compile this driver as a module, choose M here: the
784 module will be called chsc_sch.
785
786 If unsure, say N.
787
Sebastian Ott1d1c8f72012-08-28 16:46:26 +0200788config SCM_BUS
789 def_bool y
Sebastian Ott1d1c8f72012-08-28 16:46:26 +0200790 prompt "SCM bus driver"
791 help
792 Bus driver for Storage Class Memory.
793
Sebastian Otteadb86a2012-08-28 16:48:16 +0200794config EADM_SCH
795 def_tristate m
796 prompt "Support for EADM subchannels"
797 depends on SCM_BUS
798 help
799 This driver allows usage of EADM subchannels. EADM subchannels act
800 as a communication vehicle for SCM increments.
801
802 To compile this driver as a module, choose M here: the
803 module will be called eadm_sch.
804
Dong Jia Shi63f19342017-03-17 04:17:31 +0100805config VFIO_CCW
806 def_tristate n
807 prompt "Support for VFIO-CCW subchannels"
Dong Jia Shi84cd8fc2017-03-17 04:17:33 +0100808 depends on S390_CCW_IOMMU && VFIO_MDEV
Dong Jia Shi63f19342017-03-17 04:17:31 +0100809 help
810 This driver allows usage of I/O subchannels via VFIO-CCW.
811
812 To compile this driver as a module, choose M here: the
813 module will be called vfio_ccw.
814
Tony Krowiak1fde5732018-09-25 19:16:19 -0400815config VFIO_AP
816 def_tristate n
817 prompt "VFIO support for AP devices"
818 depends on S390_AP_IOMMU && VFIO_MDEV_DEVICE && KVM
819 help
820 This driver grants access to Adjunct Processor (AP) devices
821 via the VFIO mediated device interface.
822
823 To compile this driver as a module, choose M here: the module
824 will be called vfio_ap.
825
Jan Glauber843c48f2012-08-27 10:55:18 +0200826endmenu
827
828menu "Dump support"
829
830config CRASH_DUMP
831 bool "kernel crash dumps"
Heiko Carstens5a79859a2015-02-12 13:08:27 +0100832 depends on SMP
Jan Glauber843c48f2012-08-27 10:55:18 +0200833 select KEXEC
834 help
835 Generate crash dump after being started by kexec.
836 Crash dump kernels are loaded in the main kernel with kexec-tools
837 into a specially reserved region and then later executed after
838 a crash by kdump/kexec.
Jan Glauber843c48f2012-08-27 10:55:18 +0200839 Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this.
Michael Holzheubf28a592014-04-14 10:38:05 +0200840 This option also enables s390 zfcpdump.
841 See also <file:Documentation/s390/zfcpdump.txt>
Jan Glauber843c48f2012-08-27 10:55:18 +0200842
843endmenu
844
Jan Glauber843c48f2012-08-27 10:55:18 +0200845config SECCOMP
846 def_bool y
847 prompt "Enable seccomp to safely compute untrusted bytecode"
848 depends on PROC_FS
849 help
850 This kernel feature is useful for number crunching applications
851 that may need to compute untrusted bytecode during their
852 execution. By using pipes or other transports made available to
853 the process as file descriptors supporting the read/write
854 syscalls, it's possible to isolate those applications in
855 their own address space using seccomp. Once seccomp is
856 enabled via /proc/<pid>/seccomp, it cannot be disabled
857 and the task is only allowed to execute a few safe syscalls
858 defined by each seccomp mode.
859
860 If unsure, say Y.
861
Jan Glauber843c48f2012-08-27 10:55:18 +0200862menu "Power Management"
863
864config ARCH_HIBERNATION_POSSIBLE
Heiko Carstens5a79859a2015-02-12 13:08:27 +0100865 def_bool y
Jan Glauber843c48f2012-08-27 10:55:18 +0200866
867source "kernel/power/Kconfig"
868
869endmenu
870
Jan Glauber843c48f2012-08-27 10:55:18 +0200871config CCW
872 def_bool y
873
Ursula Braunb6ef86e2018-05-22 12:42:57 +0200874config HAVE_PNETID
875 tristate
876 default (SMC || CCWGROUP)
877
Jan Glauber843c48f2012-08-27 10:55:18 +0200878menu "Virtualization"
Heiko Carstens684de392008-03-05 12:37:14 +0100879
Vasily Gorbik5abb9352019-04-01 19:11:03 +0200880config PROTECTED_VIRTUALIZATION_GUEST
881 def_bool n
882 prompt "Protected virtualization guest support"
883 help
884 Select this option, if you want to be able to run this
885 kernel as a protected virtualization KVM guest.
886 Protected virtualization capable machines have a mini hypervisor
887 located at machine level (an ultravisor). With help of the
888 Ultravisor, KVM will be able to run "protected" VMs, special
889 VMs whose memory and management data are unavailable to KVM.
890
Linus Torvalds1da177e2005-04-16 15:20:36 -0700891config PFAULT
Martin Schwidefsky6f9a3c32011-01-05 12:47:15 +0100892 def_bool y
893 prompt "Pseudo page fault support"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700894 help
895 Select this option, if you want to use PFAULT pseudo page fault
896 handling under VM. If running native or in LPAR, this option
897 has no effect. If your VM does not support PFAULT, PAGEEX
898 pseudo page fault handling will be used.
899 Note that VM 4.2 supports PFAULT but has a bug in its
900 implementation that causes some problems.
901 Everybody who wants to run Linux under VM != VM4.2 should select
902 this option.
903
Linus Torvalds1da177e2005-04-16 15:20:36 -0700904config CMM
Martin Schwidefsky6f9a3c32011-01-05 12:47:15 +0100905 def_tristate n
906 prompt "Cooperative memory management"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700907 help
908 Select this option, if you want to enable the kernel interface
909 to reduce the memory size of the system. This is accomplished
910 by allocating pages of memory and put them "on hold". This only
911 makes sense for a system running under VM where the unused pages
912 will be reused by VM for other guest systems. The interface
913 allows an external monitor to balance memory of many systems.
914 Everybody who wants to run Linux under VM should select this
915 option.
916
Linus Torvalds1da177e2005-04-16 15:20:36 -0700917config CMM_IUCV
Martin Schwidefsky6f9a3c32011-01-05 12:47:15 +0100918 def_bool y
919 prompt "IUCV special message interface to cooperative memory management"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700920 depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
921 help
922 Select this option to enable the special message interface to
923 the cooperative memory management.
924
Linus Torvalds1da177e2005-04-16 15:20:36 -0700925config APPLDATA_BASE
Martin Schwidefsky6f9a3c32011-01-05 12:47:15 +0100926 def_bool n
927 prompt "Linux - VM Monitor Stream, base infrastructure"
Martin Schwidefskyc185b782008-12-25 13:39:25 +0100928 depends on PROC_FS
Linus Torvalds1da177e2005-04-16 15:20:36 -0700929 help
930 This provides a kernel interface for creating and updating z/VM APPLDATA
931 monitor records. The monitor records are updated at certain time
932 intervals, once the timer is started.
933 Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
934 i.e. enables or disables monitoring on the Linux side.
935 A custom interval value (in seconds) can be written to
936 /proc/appldata/interval.
937
938 Defaults are 60 seconds interval and timer off.
939 The /proc entries can also be read from, showing the current settings.
940
941config APPLDATA_MEM
Martin Schwidefsky6f9a3c32011-01-05 12:47:15 +0100942 def_tristate m
943 prompt "Monitor memory management statistics"
Al Viro62fb2ba2006-12-13 00:34:59 -0800944 depends on APPLDATA_BASE && VM_EVENT_COUNTERS
Linus Torvalds1da177e2005-04-16 15:20:36 -0700945 help
946 This provides memory management related data to the Linux - VM Monitor
947 Stream, like paging/swapping rate, memory utilisation, etc.
948 Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
949 APPLDATA monitor record, i.e. enables or disables monitoring this record
950 on the z/VM side.
951
952 Default is disabled.
953 The /proc entry can also be read from, showing the current settings.
954
955 This can also be compiled as a module, which will be called
956 appldata_mem.o.
957
958config APPLDATA_OS
Martin Schwidefsky6f9a3c32011-01-05 12:47:15 +0100959 def_tristate m
960 prompt "Monitor OS statistics"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700961 depends on APPLDATA_BASE
962 help
963 This provides OS related data to the Linux - VM Monitor Stream, like
964 CPU utilisation, etc.
965 Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
966 APPLDATA monitor record, i.e. enables or disables monitoring this record
967 on the z/VM side.
968
969 Default is disabled.
970 This can also be compiled as a module, which will be called
971 appldata_os.o.
972
973config APPLDATA_NET_SUM
Martin Schwidefsky6f9a3c32011-01-05 12:47:15 +0100974 def_tristate m
975 prompt "Monitor overall network statistics"
Sachin Sant70193af2009-03-26 15:24:00 +0100976 depends on APPLDATA_BASE && NET
Linus Torvalds1da177e2005-04-16 15:20:36 -0700977 help
978 This provides network related data to the Linux - VM Monitor Stream,
979 currently there is only a total sum of network I/O statistics, no
980 per-interface data.
981 Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
982 APPLDATA monitor record, i.e. enables or disables monitoring this record
983 on the z/VM side.
984
985 Default is disabled.
986 This can also be compiled as a module, which will be called
987 appldata_net_sum.o.
988
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700989config S390_HYPFS_FS
Martin Schwidefsky6f9a3c32011-01-05 12:47:15 +0100990 def_bool y
991 prompt "s390 hypervisor file system support"
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700992 select SYS_HYPERVISOR
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700993 help
994 This is a virtual file system intended to provide accounting
995 information in an s390 hypervisor environment.
996
Jan Glauber843c48f2012-08-27 10:55:18 +0200997source "arch/s390/kvm/Kconfig"
Michael Holzheu411ed322007-04-27 16:01:49 +0200998
Carsten Ottefa587742008-03-25 18:47:44 +0100999config S390_GUEST
Martin Schwidefsky6f9a3c32011-01-05 12:47:15 +01001000 def_bool y
Kees Cook510cf5a2012-10-02 11:16:42 -07001001 prompt "s390 support for virtio devices"
Chen Gang79b6f7f2013-07-23 16:26:08 +08001002 select TTY
Christian Borntraeger80629b02011-06-22 16:24:07 +02001003 select VIRTUALIZATION
Carsten Ottefa587742008-03-25 18:47:44 +01001004 select VIRTIO
Christian Borntraegerfaeba8302008-06-20 15:24:18 +02001005 select VIRTIO_CONSOLE
Carsten Ottefa587742008-03-25 18:47:44 +01001006 help
Cornelia Huckbdd1fc22012-08-27 12:56:48 +02001007 Enabling this option adds support for virtio based paravirtual device
1008 drivers on s390.
1009
Christian Borntraeger20766c02008-08-29 13:30:56 +02001010 Select this option if you want to run the kernel as a guest under
Cornelia Huckbdd1fc22012-08-27 12:56:48 +02001011 the KVM hypervisor.
Heiko Carstensbcf5cef2009-06-12 10:26:26 +02001012
Linus Torvalds1da177e2005-04-16 15:20:36 -07001013endmenu