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Linus Torvalds1da177e2005-04-16 15:20:36 -07001config MMU
Martin Schwidefsky61d48c22007-05-10 15:46:00 +02002 def_bool y
Linus Torvalds1da177e2005-04-16 15:20:36 -07003
Christoph Lameter66701b12007-02-10 01:43:09 -08004config ZONE_DMA
Heiko Carstens69dbb2f2011-05-26 09:48:31 +02005 def_bool y
Christoph Lameter66701b12007-02-10 01:43:09 -08006
Ingo Molnar2b105ff2006-07-03 00:25:02 -07007config LOCKDEP_SUPPORT
Martin Schwidefsky61d48c22007-05-10 15:46:00 +02008 def_bool y
Ingo Molnar2b105ff2006-07-03 00:25:02 -07009
Heiko Carstens5bdc9b42006-07-03 00:24:41 -070010config STACKTRACE_SUPPORT
Martin Schwidefsky61d48c22007-05-10 15:46:00 +020011 def_bool y
Heiko Carstens5bdc9b42006-07-03 00:24:41 -070012
Heiko Carstensa3afe702008-02-05 16:50:45 +010013config HAVE_LATENCYTOP_SUPPORT
14 def_bool y
15
Linus Torvalds1da177e2005-04-16 15:20:36 -070016config RWSEM_GENERIC_SPINLOCK
17 bool
18
19config RWSEM_XCHGADD_ALGORITHM
Martin Schwidefsky61d48c22007-05-10 15:46:00 +020020 def_bool y
Linus Torvalds1da177e2005-04-16 15:20:36 -070021
David Howellsf0d1b0b2006-12-08 02:37:49 -080022config ARCH_HAS_ILOG2_U32
Martin Schwidefsky6f9a3c32011-01-05 12:47:15 +010023 def_bool n
David Howellsf0d1b0b2006-12-08 02:37:49 -080024
25config ARCH_HAS_ILOG2_U64
Martin Schwidefsky6f9a3c32011-01-05 12:47:15 +010026 def_bool n
David Howellsf0d1b0b2006-12-08 02:37:49 -080027
Akinobu Mita7e33db42006-03-26 01:39:34 -080028config GENERIC_HWEIGHT
Martin Schwidefsky61d48c22007-05-10 15:46:00 +020029 def_bool y
Akinobu Mita7e33db42006-03-26 01:39:34 -080030
Heiko Carstensc0007f12007-04-27 16:01:42 +020031config GENERIC_BUG
Martin Schwidefsky6f9a3c32011-01-05 12:47:15 +010032 def_bool y if BUG
Heiko Carstensc0007f12007-04-27 16:01:42 +020033
Heiko Carstens52499f42010-02-26 22:37:44 +010034config GENERIC_BUG_RELATIVE_POINTERS
35 def_bool y
36
FUJITA Tomonorieca577e2010-10-25 16:10:50 +020037config ARCH_DMA_ADDR_T_64BIT
Heiko Carstens5a798592015-02-12 13:08:27 +010038 def_bool y
FUJITA Tomonorieca577e2010-10-25 16:10:50 +020039
Martin Schwidefskyb6b40c52008-02-05 16:50:42 +010040config GENERIC_LOCKBREAK
Martin Schwidefsky6f9a3c32011-01-05 12:47:15 +010041 def_bool y if SMP && PREEMPT
Martin Schwidefskyb6b40c52008-02-05 16:50:42 +010042
Carsten Otte402b0862008-03-25 18:47:10 +010043config PGSTE
Martin Schwidefsky6f9a3c32011-01-05 12:47:15 +010044 def_bool y if KVM
Carsten Otte402b0862008-03-25 18:47:10 +010045
Akinobu Mita6a11f752009-03-31 15:23:17 -070046config ARCH_SUPPORTS_DEBUG_PAGEALLOC
47 def_bool y
48
Jan Glauber843c48f2012-08-27 10:55:18 +020049config KEXEC
50 def_bool y
Dave Young2965faa2015-09-09 15:38:55 -070051 select KEXEC_CORE
Jan Glauber843c48f2012-08-27 10:55:18 +020052
53config AUDIT_ARCH
54 def_bool y
55
Uwe Kleine-Königce816fa2014-04-07 15:39:19 -070056config NO_IOPORT_MAP
Jan Glauberc8717a32012-11-29 14:38:46 +010057 def_bool y
58
59config PCI_QUIRKS
60 def_bool n
61
Jan Willeke2a0a5b22014-09-22 16:39:06 +020062config ARCH_SUPPORTS_UPROBES
Heiko Carstens5a798592015-02-12 13:08:27 +010063 def_bool y
Jan Willeke2a0a5b22014-09-22 16:39:06 +020064
Martin Schwidefsky347a8dc2006-01-06 00:19:28 -080065config S390
Martin Schwidefsky61d48c22007-05-10 15:46:00 +020066 def_bool y
Heiko Carstens0e0d04a2013-02-06 10:15:55 +010067 select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
Heiko Carstens93bead42013-09-06 10:03:30 +020068 select ARCH_HAS_DEBUG_STRICT_USER_COPY_CHECKS
Kees Cook2b68f6c2015-04-14 15:48:00 -070069 select ARCH_HAS_ELF_RANDOMIZE
Riku Voipio957e3fa2014-12-12 16:57:44 -080070 select ARCH_HAS_GCOV_PROFILE_ALL
Heiko Carstens47523c92014-12-22 10:07:04 +010071 select ARCH_HAS_SG_CHAIN
Heiko Carstens0e0d04a2013-02-06 10:15:55 +010072 select ARCH_HAVE_NMI_SAFE_CMPXCHG
Thomas Gleixner6beb0002009-11-09 15:21:34 +000073 select ARCH_INLINE_READ_LOCK
74 select ARCH_INLINE_READ_LOCK_BH
75 select ARCH_INLINE_READ_LOCK_IRQ
76 select ARCH_INLINE_READ_LOCK_IRQSAVE
Heiko Carstens0e0d04a2013-02-06 10:15:55 +010077 select ARCH_INLINE_READ_TRYLOCK
Thomas Gleixner6beb0002009-11-09 15:21:34 +000078 select ARCH_INLINE_READ_UNLOCK
79 select ARCH_INLINE_READ_UNLOCK_BH
80 select ARCH_INLINE_READ_UNLOCK_IRQ
81 select ARCH_INLINE_READ_UNLOCK_IRQRESTORE
Heiko Carstens0e0d04a2013-02-06 10:15:55 +010082 select ARCH_INLINE_SPIN_LOCK
83 select ARCH_INLINE_SPIN_LOCK_BH
84 select ARCH_INLINE_SPIN_LOCK_IRQ
85 select ARCH_INLINE_SPIN_LOCK_IRQSAVE
86 select ARCH_INLINE_SPIN_TRYLOCK
87 select ARCH_INLINE_SPIN_TRYLOCK_BH
88 select ARCH_INLINE_SPIN_UNLOCK
89 select ARCH_INLINE_SPIN_UNLOCK_BH
90 select ARCH_INLINE_SPIN_UNLOCK_IRQ
91 select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE
Thomas Gleixner6beb0002009-11-09 15:21:34 +000092 select ARCH_INLINE_WRITE_LOCK
93 select ARCH_INLINE_WRITE_LOCK_BH
94 select ARCH_INLINE_WRITE_LOCK_IRQ
95 select ARCH_INLINE_WRITE_LOCK_IRQSAVE
Heiko Carstens0e0d04a2013-02-06 10:15:55 +010096 select ARCH_INLINE_WRITE_TRYLOCK
Thomas Gleixner6beb0002009-11-09 15:21:34 +000097 select ARCH_INLINE_WRITE_UNLOCK
98 select ARCH_INLINE_WRITE_UNLOCK_BH
99 select ARCH_INLINE_WRITE_UNLOCK_IRQ
100 select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE
Heiko Carstens0e0d04a2013-02-06 10:15:55 +0100101 select ARCH_SAVE_PAGE_KEYS if HIBERNATION
Christian Borntraeger36e7fda2014-08-05 09:57:51 +0200102 select ARCH_SUPPORTS_ATOMIC_RMW
Philipp Hachtmanna763bc82015-05-08 17:40:44 +0200103 select ARCH_SUPPORTS_NUMA_BALANCING
Christian Borntraeger295d8fa2015-10-29 01:16:04 +0100104 select ARCH_USE_BUILTIN_BSWAP
Heiko Carstensefc1d232013-09-05 13:26:17 +0200105 select ARCH_USE_CMPXCHG_LOCKREF
Philipp Hachtmanna763bc82015-05-08 17:40:44 +0200106 select ARCH_WANTS_PROT_NUMA_PROT_NONE
Will Deaconc1d7e012012-07-30 14:42:46 -0700107 select ARCH_WANT_IPC_PARSE_VERSION
Heiko Carstens0e0d04a2013-02-06 10:15:55 +0100108 select BUILDTIME_EXTABLE_SORT
109 select CLONE_BACKWARDS2
Heiko Carstens5d6a0162014-08-15 13:16:09 +0200110 select DYNAMIC_FTRACE if FUNCTION_TRACER
Heiko Carstens0e0d04a2013-02-06 10:15:55 +0100111 select GENERIC_CLOCKEVENTS
Hendrik Brueckner8f00b3e2015-02-19 12:22:02 +0100112 select GENERIC_CPU_AUTOPROBE
Heiko Carstens0e0d04a2013-02-06 10:15:55 +0100113 select GENERIC_CPU_DEVICES if !SMP
Heiko Carstens746479c2013-09-18 11:45:36 +0200114 select GENERIC_FIND_FIRST_BIT
Thomas Gleixnere80e7812012-04-20 13:05:52 +0000115 select GENERIC_SMP_IDLE_THREAD
Martin Schwidefsky79c74ec2013-11-22 10:04:53 +0100116 select GENERIC_TIME_VSYSCALL
Heiko Carstens0e0d04a2013-02-06 10:15:55 +0100117 select HAVE_ALIGNED_STRUCT_PAGE if SLUB
AKASHI Takahiro7a017722014-02-25 18:16:24 +0900118 select HAVE_ARCH_AUDITSYSCALL
Philipp Hachtmanna763bc82015-05-08 17:40:44 +0200119 select HAVE_ARCH_EARLY_PFN_TO_NID
Heiko Carstens5a798592015-02-12 13:08:27 +0100120 select HAVE_ARCH_JUMP_LABEL
Heiko Carstensc63cb462012-07-31 15:37:13 +0200121 select HAVE_ARCH_SECCOMP_FILTER
Martin Schwidefsky5614dd92015-04-22 14:47:42 +0200122 select HAVE_ARCH_SOFT_DIRTY
Heiko Carstens0e0d04a2013-02-06 10:15:55 +0100123 select HAVE_ARCH_TRACEHOOK
Heiko Carstens5a798592015-02-12 13:08:27 +0100124 select HAVE_ARCH_TRANSPARENT_HUGEPAGE
Heiko Carstens77a87f02015-04-21 16:50:08 +0200125 select HAVE_BPF_JIT if PACK_STACK && HAVE_MARCH_Z196_FEATURES
Heiko Carstens0e0d04a2013-02-06 10:15:55 +0100126 select HAVE_CMPXCHG_DOUBLE
127 select HAVE_CMPXCHG_LOCAL
Heiko Carstens0e0d04a2013-02-06 10:15:55 +0100128 select HAVE_DEBUG_KMEMLEAK
Heiko Carstens5a798592015-02-12 13:08:27 +0100129 select HAVE_DYNAMIC_FTRACE
130 select HAVE_DYNAMIC_FTRACE_WITH_REGS
Heiko Carstens0e0d04a2013-02-06 10:15:55 +0100131 select HAVE_FTRACE_MCOUNT_RECORD
Heiko Carstens5a798592015-02-12 13:08:27 +0100132 select HAVE_FUNCTION_GRAPH_TRACER
133 select HAVE_FUNCTION_TRACER
Heiko Carstens03b8c7b2014-03-02 13:09:47 +0100134 select HAVE_FUTEX_CMPXCHG if FUTEX
Heiko Carstens0e0d04a2013-02-06 10:15:55 +0100135 select HAVE_KERNEL_BZIP2
136 select HAVE_KERNEL_GZIP
Heiko Carstens8e2872c2013-07-18 15:18:24 +0200137 select HAVE_KERNEL_LZ4
Heiko Carstens0e0d04a2013-02-06 10:15:55 +0100138 select HAVE_KERNEL_LZMA
139 select HAVE_KERNEL_LZO
140 select HAVE_KERNEL_XZ
141 select HAVE_KPROBES
142 select HAVE_KRETPROBES
Heiko Carstens5a798592015-02-12 13:08:27 +0100143 select HAVE_KVM
Jiri Slaby21042d42015-03-26 10:10:17 +0100144 select HAVE_LIVEPATCH
Heiko Carstens0e0d04a2013-02-06 10:15:55 +0100145 select HAVE_MEMBLOCK
146 select HAVE_MEMBLOCK_NODE_MAP
Philipp Hachtmann50be6342014-01-29 18:16:01 +0100147 select HAVE_MEMBLOCK_PHYS_MAP
David Howells786d35d2012-09-28 14:31:03 +0930148 select HAVE_MOD_ARCH_SPECIFIC
Heiko Carstens0e0d04a2013-02-06 10:15:55 +0100149 select HAVE_OPROFILE
150 select HAVE_PERF_EVENTS
151 select HAVE_REGS_AND_STACK_ACCESS_API
152 select HAVE_SYSCALL_TRACEPOINTS
Heiko Carstens0e0d04a2013-02-06 10:15:55 +0100153 select HAVE_VIRT_CPU_ACCOUNTING
David Howells786d35d2012-09-28 14:31:03 +0930154 select MODULES_USE_ELF_RELA
Philipp Hachtmann50be6342014-01-29 18:16:01 +0100155 select NO_BOOTMEM
Al Viro7eddd992012-12-25 19:26:12 -0500156 select OLD_SIGACTION
Heiko Carstens93bead42013-09-06 10:03:30 +0200157 select OLD_SIGSUSPEND3
Heiko Carstens0e0d04a2013-02-06 10:15:55 +0100158 select SYSCTL_EXCEPTION_TRACE
Josh Triplett05634162014-02-26 18:13:06 -0800159 select TTY
Heiko Carstens0e0d04a2013-02-06 10:15:55 +0100160 select VIRT_CPU_ACCOUNTING
Heiko Carstens93bead42013-09-06 10:03:30 +0200161 select VIRT_TO_BUS
Philipp Hachtmann3a368f72014-03-06 18:25:13 +0100162
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163
Martin Schwidefskyfca3e352009-07-07 16:37:10 +0200164config SCHED_OMIT_FRAME_POINTER
Martin Schwidefsky6f9a3c32011-01-05 12:47:15 +0100165 def_bool y
Martin Schwidefskyfca3e352009-07-07 16:37:10 +0200166
Kirill A. Shutemovc81956c2015-04-14 15:46:00 -0700167config PGTABLE_LEVELS
168 int
169 default 4 if 64BIT
170 default 2
171
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172source "init/Kconfig"
173
Matt Helsleydc52ddc2008-10-18 20:27:21 -0700174source "kernel/Kconfig.freezer"
175
Jiri Slaby21042d42015-03-26 10:10:17 +0100176source "kernel/livepatch/Kconfig"
177
Jan Glauber843c48f2012-08-27 10:55:18 +0200178menu "Processor type and features"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179
Jan Glauber843c48f2012-08-27 10:55:18 +0200180config HAVE_MARCH_Z900_FEATURES
181 def_bool n
182
183config HAVE_MARCH_Z990_FEATURES
184 def_bool n
185 select HAVE_MARCH_Z900_FEATURES
186
187config HAVE_MARCH_Z9_109_FEATURES
188 def_bool n
189 select HAVE_MARCH_Z990_FEATURES
190
191config HAVE_MARCH_Z10_FEATURES
192 def_bool n
193 select HAVE_MARCH_Z9_109_FEATURES
194
195config HAVE_MARCH_Z196_FEATURES
196 def_bool n
197 select HAVE_MARCH_Z10_FEATURES
198
Heiko Carstens991c15052012-11-13 10:26:37 +0200199config HAVE_MARCH_ZEC12_FEATURES
200 def_bool n
201 select HAVE_MARCH_Z196_FEATURES
202
Martin Schwidefskyf8b2dcb2015-01-14 17:50:19 +0100203config HAVE_MARCH_Z13_FEATURES
204 def_bool n
205 select HAVE_MARCH_ZEC12_FEATURES
206
Jan Glauber843c48f2012-08-27 10:55:18 +0200207choice
208 prompt "Processor type"
Heiko Carstens5a798592015-02-12 13:08:27 +0100209 default MARCH_Z900
Jan Glauber843c48f2012-08-27 10:55:18 +0200210
211config MARCH_Z900
212 bool "IBM zSeries model z800 and z900"
Heiko Carstens5a798592015-02-12 13:08:27 +0100213 select HAVE_MARCH_Z900_FEATURES
Jan Glauber843c48f2012-08-27 10:55:18 +0200214 help
215 Select this to enable optimizations for model z800/z900 (2064 and
216 2066 series). This will enable some optimizations that are not
217 available on older ESA/390 (31 Bit) only CPUs.
218
219config MARCH_Z990
220 bool "IBM zSeries model z890 and z990"
Heiko Carstens5a798592015-02-12 13:08:27 +0100221 select HAVE_MARCH_Z990_FEATURES
Jan Glauber843c48f2012-08-27 10:55:18 +0200222 help
223 Select this to enable optimizations for model z890/z990 (2084 and
224 2086 series). The kernel will be slightly faster but will not work
225 on older machines.
226
227config MARCH_Z9_109
228 bool "IBM System z9"
Heiko Carstens5a798592015-02-12 13:08:27 +0100229 select HAVE_MARCH_Z9_109_FEATURES
Jan Glauber843c48f2012-08-27 10:55:18 +0200230 help
231 Select this to enable optimizations for IBM System z9 (2094 and
232 2096 series). The kernel will be slightly faster but will not work
233 on older machines.
234
235config MARCH_Z10
236 bool "IBM System z10"
Heiko Carstens5a798592015-02-12 13:08:27 +0100237 select HAVE_MARCH_Z10_FEATURES
Jan Glauber843c48f2012-08-27 10:55:18 +0200238 help
239 Select this to enable optimizations for IBM System z10 (2097 and
240 2098 series). The kernel will be slightly faster but will not work
241 on older machines.
242
243config MARCH_Z196
244 bool "IBM zEnterprise 114 and 196"
Heiko Carstens5a798592015-02-12 13:08:27 +0100245 select HAVE_MARCH_Z196_FEATURES
Jan Glauber843c48f2012-08-27 10:55:18 +0200246 help
247 Select this to enable optimizations for IBM zEnterprise 114 and 196
248 (2818 and 2817 series). The kernel will be slightly faster but will
249 not work on older machines.
250
Heiko Carstens991c15052012-11-13 10:26:37 +0200251config MARCH_ZEC12
Heiko Carstens59471222013-07-24 10:35:33 +0200252 bool "IBM zBC12 and zEC12"
Heiko Carstens5a798592015-02-12 13:08:27 +0100253 select HAVE_MARCH_ZEC12_FEATURES
Heiko Carstens991c15052012-11-13 10:26:37 +0200254 help
Heiko Carstens59471222013-07-24 10:35:33 +0200255 Select this to enable optimizations for IBM zBC12 and zEC12 (2828 and
256 2827 series). The kernel will be slightly faster but will not work on
257 older machines.
Heiko Carstens991c15052012-11-13 10:26:37 +0200258
Martin Schwidefskyf8b2dcb2015-01-14 17:50:19 +0100259config MARCH_Z13
260 bool "IBM z13"
Heiko Carstens5a798592015-02-12 13:08:27 +0100261 select HAVE_MARCH_Z13_FEATURES
Martin Schwidefskyf8b2dcb2015-01-14 17:50:19 +0100262 help
263 Select this to enable optimizations for IBM z13 (2964 series).
264 The kernel will be slightly faster but will not work on older
265 machines.
266
Jan Glauber843c48f2012-08-27 10:55:18 +0200267endchoice
Linus Torvalds1da177e2005-04-16 15:20:36 -0700268
Heiko Carstens1db9e052013-10-30 12:12:50 +0100269config MARCH_Z900_TUNE
270 def_bool TUNE_Z900 || MARCH_Z900 && TUNE_DEFAULT
271
272config MARCH_Z990_TUNE
273 def_bool TUNE_Z990 || MARCH_Z990 && TUNE_DEFAULT
274
275config MARCH_Z9_109_TUNE
276 def_bool TUNE_Z9_109 || MARCH_Z9_109 && TUNE_DEFAULT
277
278config MARCH_Z10_TUNE
279 def_bool TUNE_Z10 || MARCH_Z10 && TUNE_DEFAULT
280
281config MARCH_Z196_TUNE
282 def_bool TUNE_Z196 || MARCH_Z196 && TUNE_DEFAULT
283
284config MARCH_ZEC12_TUNE
285 def_bool TUNE_ZEC12 || MARCH_ZEC12 && TUNE_DEFAULT
286
Martin Schwidefskyf8b2dcb2015-01-14 17:50:19 +0100287config MARCH_Z13_TUNE
288 def_bool TUNE_Z13 || MARCH_Z13 && TUNE_DEFAULT
289
Heiko Carstens1db9e052013-10-30 12:12:50 +0100290choice
291 prompt "Tune code generation"
292 default TUNE_DEFAULT
293 help
294 Cause the compiler to tune (-mtune) the generated code for a machine.
295 This will make the code run faster on the selected machine but
296 somewhat slower on other machines.
297 This option only changes how the compiler emits instructions, not the
298 selection of instructions itself, so the resulting kernel will run on
299 all other machines.
300
301config TUNE_DEFAULT
302 bool "Default"
303 help
304 Tune the generated code for the target processor for which the kernel
305 will be compiled.
306
Heiko Carstens1db9e052013-10-30 12:12:50 +0100307config TUNE_Z900
308 bool "IBM zSeries model z800 and z900"
309
310config TUNE_Z990
311 bool "IBM zSeries model z890 and z990"
312
313config TUNE_Z9_109
314 bool "IBM System z9"
315
316config TUNE_Z10
317 bool "IBM System z10"
318
319config TUNE_Z196
320 bool "IBM zEnterprise 114 and 196"
321
322config TUNE_ZEC12
323 bool "IBM zBC12 and zEC12"
324
Martin Schwidefskyf8b2dcb2015-01-14 17:50:19 +0100325config TUNE_Z13
326 bool "IBM z13"
327
Heiko Carstens1db9e052013-10-30 12:12:50 +0100328endchoice
329
Martin Schwidefsky347a8dc2006-01-06 00:19:28 -0800330config 64BIT
Martin Schwidefsky6f9a3c32011-01-05 12:47:15 +0100331 def_bool y
Martin Schwidefskyd9f7a742006-09-28 16:55:39 +0200332
Jan Glauber843c48f2012-08-27 10:55:18 +0200333config COMPAT
334 def_bool y
335 prompt "Kernel support for 31 bit emulation"
Jan Glauber843c48f2012-08-27 10:55:18 +0200336 select COMPAT_BINFMT_ELF if BINFMT_ELF
337 select ARCH_WANT_OLD_COMPAT_IPC
Al Viro7eddd992012-12-25 19:26:12 -0500338 select COMPAT_OLD_SIGACTION
Iulia Manda28138932015-04-15 16:16:41 -0700339 depends on MULTIUSER
Jan Glauber843c48f2012-08-27 10:55:18 +0200340 help
341 Select this option if you want to enable your system kernel to
342 handle system-calls from ELF binaries for 31 bit ESA. This option
343 (and some other stuff like libraries and such) is needed for
344 executing 31 bit applications. It is safe to say "Y".
345
346config SYSVIPC_COMPAT
347 def_bool y if COMPAT && SYSVIPC
348
349config KEYS_COMPAT
350 def_bool y if COMPAT && KEYS
351
Linus Torvalds1da177e2005-04-16 15:20:36 -0700352config SMP
Martin Schwidefsky6f9a3c32011-01-05 12:47:15 +0100353 def_bool y
354 prompt "Symmetric multi-processing support"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700355 ---help---
356 This enables support for systems with more than one CPU. If you have
357 a system with only one CPU, like most personal computers, say N. If
358 you have a system with more than one CPU, say Y.
359
Robert Graffham4a474152014-01-23 15:55:29 -0800360 If you say N here, the kernel will run on uni- and multiprocessor
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361 machines, but will use only one CPU of a multiprocessor machine. If
362 you say Y here, the kernel will run on many, but not all,
Robert Graffham4a474152014-01-23 15:55:29 -0800363 uniprocessor machines. On a uniprocessor machine, the kernel
Linus Torvalds1da177e2005-04-16 15:20:36 -0700364 will run faster if you say N here.
365
Adrian Bunk03502fa2008-02-03 15:50:21 +0200366 See also the SMP-HOWTO available at
367 <http://www.tldp.org/docs.html#howto>.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700368
369 Even if you don't know what to do here, say Y.
370
371config NR_CPUS
Heiko Carstens5c75a0d2015-01-28 16:52:01 +0100372 int "Maximum number of CPUs (2-512)"
373 range 2 512
Linus Torvalds1da177e2005-04-16 15:20:36 -0700374 depends on SMP
Heiko Carstens5a798592015-02-12 13:08:27 +0100375 default "64"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700376 help
377 This allows you to specify the maximum number of CPUs which this
Heiko Carstens5c75a0d2015-01-28 16:52:01 +0100378 kernel will support. The maximum supported value is 512 and the
Linus Torvalds1da177e2005-04-16 15:20:36 -0700379 minimum value which makes sense is 2.
380
381 This is purely to save memory - each supported CPU adds
382 approximately sixteen kilobytes to the kernel image.
383
384config HOTPLUG_CPU
Martin Schwidefsky6f9a3c32011-01-05 12:47:15 +0100385 def_bool y
386 prompt "Support for hot-pluggable CPUs"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700387 depends on SMP
Linus Torvalds1da177e2005-04-16 15:20:36 -0700388 help
389 Say Y here to be able to turn CPUs off and on. CPUs
390 can be controlled through /sys/devices/system/cpu/cpu#.
391 Say N if you want to disable CPU hotplug.
392
Martin Schwidefsky10ad34b2015-01-14 17:52:10 +0100393config SCHED_SMT
394 def_bool n
395
Philipp Hachtmann3a368f72014-03-06 18:25:13 +0100396# Some NUMA nodes have memory ranges that span
397# other nodes. Even though a pfn is valid and
398# between a node's start and end pfns, it may not
399# reside on that node. See memmap_init_zone()
400# for details. <- They meant memory holes!
401config NODES_SPAN_OTHER_NODES
402 def_bool NUMA
403
404config NUMA
405 bool "NUMA support"
406 depends on SMP && 64BIT && SCHED_TOPOLOGY
407 default n
408 help
409 Enable NUMA support
410
411 This option adds NUMA support to the kernel.
412
413 An operation mode can be selected by appending
414 numa=<method> to the kernel command line.
415
416 The default behaviour is identical to appending numa=plain to
417 the command line. This will create just one node with all
418 available memory and all CPUs in it.
419
420config NODES_SHIFT
421 int "Maximum NUMA nodes (as a power of 2)"
422 range 1 10
423 depends on NUMA
424 default "4"
425 help
426 Specify the maximum number of NUMA nodes available on the target
427 system. Increases memory reserved to accommodate various tables.
428
Michael Holzheuc29a7ba2014-03-06 18:47:21 +0100429menu "Select NUMA modes"
430 depends on NUMA
431
432config NUMA_EMU
433 bool "NUMA emulation"
434 default y
435 help
436 Numa emulation mode will split the available system memory into
437 equal chunks which then are distributed over the configured number
438 of nodes in a round-robin manner.
439
440 The number of fake nodes is limited by the number of available memory
441 chunks (i.e. memory size / fake size) and the number of supported
442 nodes in the kernel.
443
444 The CPUs are assigned to the nodes in a way that partially respects
445 the original machine topology (if supported by the machine).
446 Fair distribution of the CPUs is not guaranteed.
447
448config EMU_SIZE
449 hex "NUMA emulation memory chunk size"
450 default 0x10000000
451 range 0x400000 0x100000000
452 depends on NUMA_EMU
453 help
454 Select the default size by which the memory is chopped and then
455 assigned to emulated NUMA nodes.
456
457 This can be overridden by specifying
458
459 emu_size=<n>
460
461 on the kernel command line where also suffixes K, M, G, and T are
462 supported.
463
464endmenu
465
Heiko Carstens8d11e022010-10-29 16:50:37 +0200466config SCHED_MC
Heiko Carstens83a24e32011-12-27 11:27:09 +0100467 def_bool n
Heiko Carstens8d11e022010-10-29 16:50:37 +0200468
Heiko Carstens4cb14bc2010-08-31 10:28:18 +0200469config SCHED_BOOK
Martin Schwidefsky10ad34b2015-01-14 17:52:10 +0100470 def_bool n
471
472config SCHED_TOPOLOGY
Martin Schwidefsky6f9a3c32011-01-05 12:47:15 +0100473 def_bool y
Martin Schwidefsky10ad34b2015-01-14 17:52:10 +0100474 prompt "Topology scheduler support"
Heiko Carstens83a24e32011-12-27 11:27:09 +0100475 depends on SMP
Martin Schwidefsky10ad34b2015-01-14 17:52:10 +0100476 select SCHED_SMT
Heiko Carstens83a24e32011-12-27 11:27:09 +0100477 select SCHED_MC
Martin Schwidefsky10ad34b2015-01-14 17:52:10 +0100478 select SCHED_BOOK
Heiko Carstens4cb14bc2010-08-31 10:28:18 +0200479 help
Martin Schwidefsky10ad34b2015-01-14 17:52:10 +0100480 Topology scheduler support improves the CPU scheduler's decision
481 making when dealing with machines that have multi-threading,
482 multiple cores or multiple books.
Heiko Carstens4cb14bc2010-08-31 10:28:18 +0200483
Jan Glauber843c48f2012-08-27 10:55:18 +0200484source kernel/Kconfig.preempt
485
Jan Glauber843c48f2012-08-27 10:55:18 +0200486source kernel/Kconfig.hz
487
488endmenu
489
490menu "Memory setup"
491
492config ARCH_SPARSEMEM_ENABLE
Martin Schwidefsky6f9a3c32011-01-05 12:47:15 +0100493 def_bool y
Jan Glauber843c48f2012-08-27 10:55:18 +0200494 select SPARSEMEM_VMEMMAP_ENABLE
495 select SPARSEMEM_VMEMMAP
Linus Torvalds1da177e2005-04-16 15:20:36 -0700496
Jan Glauber843c48f2012-08-27 10:55:18 +0200497config ARCH_SPARSEMEM_DEFAULT
Martin Schwidefsky6f9a3c32011-01-05 12:47:15 +0100498 def_bool y
Al Viroe65e1fc2006-09-12 03:04:40 -0400499
Jan Glauber843c48f2012-08-27 10:55:18 +0200500config ARCH_SELECT_MEMORY_MODEL
501 def_bool y
Heiko Carstens05445162012-05-14 10:12:41 +0200502
Jan Glauber843c48f2012-08-27 10:55:18 +0200503config ARCH_ENABLE_MEMORY_HOTPLUG
504 def_bool y if SPARSEMEM
Heiko Carstens05445162012-05-14 10:12:41 +0200505
Jan Glauber843c48f2012-08-27 10:55:18 +0200506config ARCH_ENABLE_MEMORY_HOTREMOVE
507 def_bool y
Heiko Carstens05445162012-05-14 10:12:41 +0200508
Martin Schwidefskyec66ad62014-02-12 14:16:18 +0100509config ARCH_ENABLE_SPLIT_PMD_PTLOCK
510 def_bool y
Martin Schwidefskyec66ad62014-02-12 14:16:18 +0100511
Jan Glauber843c48f2012-08-27 10:55:18 +0200512config FORCE_MAX_ZONEORDER
513 int
514 default "9"
Heiko Carstens05445162012-05-14 10:12:41 +0200515
Jan Glauber843c48f2012-08-27 10:55:18 +0200516source "mm/Kconfig"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700517
518config PACK_STACK
Martin Schwidefsky6f9a3c32011-01-05 12:47:15 +0100519 def_bool y
520 prompt "Pack kernel stack"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700521 help
522 This option enables the compiler option -mkernel-backchain if it
523 is available. If the option is available the compiler supports
524 the new stack layout which dramatically reduces the minimum stack
525 frame size. With an old compiler a non-leaf function needs a
526 minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With
527 -mkernel-backchain the minimum size drops to 16 byte on 31 bit
528 and 24 byte on 64 bit.
529
530 Say Y if you are unsure.
531
Linus Torvalds1da177e2005-04-16 15:20:36 -0700532config CHECK_STACK
Martin Schwidefsky6f9a3c32011-01-05 12:47:15 +0100533 def_bool y
534 prompt "Detect kernel stack overflow"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700535 help
536 This option enables the compiler option -mstack-guard and
537 -mstack-size if they are available. If the compiler supports them
538 it will emit additional code to each function prolog to trigger
539 an illegal operation if the kernel stack is about to overflow.
540
541 Say N if you are unsure.
542
543config STACK_GUARD
544 int "Size of the guard area (128-1024)"
545 range 128 1024
546 depends on CHECK_STACK
547 default "256"
548 help
549 This allows you to specify the size of the guard area at the lower
550 end of the kernel stack. If the kernel stack points into the guard
551 area on function entry an illegal operation is triggered. The size
552 needs to be a power of 2. Please keep in mind that the size of an
553 interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit.
554 The minimum size for the stack guard should be 256 for 31 bit and
555 512 for 64 bit.
556
Jan Glauber2c190da2011-03-15 17:08:19 +0100557config WARN_DYNAMIC_STACK
Martin Schwidefsky6f9a3c32011-01-05 12:47:15 +0100558 def_bool n
Jan Glauber2c190da2011-03-15 17:08:19 +0100559 prompt "Emit compiler warnings for function with dynamic stack usage"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700560 help
Jan Glauber2c190da2011-03-15 17:08:19 +0100561 This option enables the compiler option -mwarn-dynamicstack. If the
562 compiler supports this options generates warnings for functions
563 that dynamically allocate stack space using alloca.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700564
565 Say N if you are unsure.
566
Jan Glauber843c48f2012-08-27 10:55:18 +0200567endmenu
Martin Schwidefsky61d48c22007-05-10 15:46:00 +0200568
Jan Glauber843c48f2012-08-27 10:55:18 +0200569menu "I/O subsystem"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700570
Linus Torvalds1da177e2005-04-16 15:20:36 -0700571config QDIO
Martin Schwidefsky6f9a3c32011-01-05 12:47:15 +0100572 def_tristate y
573 prompt "QDIO support"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700574 ---help---
Frank Pavlic8129ee12006-01-06 00:19:20 -0800575 This driver provides the Queued Direct I/O base support for
Ursula Braunefca13b2008-04-17 07:46:19 +0200576 IBM System z.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700577
578 To compile this driver as a module, choose M here: the
579 module will be called qdio.
580
581 If unsure, say Y.
582
Jan Glauberc8717a32012-11-29 14:38:46 +0100583menuconfig PCI
584 bool "PCI support"
Thierry Reding90114d62014-08-25 13:02:52 +0200585 select HAVE_DMA_ATTRS
Jan Glauberc8717a32012-11-29 14:38:46 +0100586 select PCI_MSI
Gerald Schaefer8128f23c2015-08-27 15:33:03 +0200587 select IOMMU_SUPPORT
Jan Glauberc8717a32012-11-29 14:38:46 +0100588 help
589 Enable PCI support.
590
591if PCI
592
593config PCI_NR_FUNCTIONS
594 int "Maximum number of PCI functions (1-4096)"
595 range 1 4096
596 default "64"
597 help
598 This allows you to specify the maximum number of PCI functions which
599 this kernel will support.
600
Martin Schwidefsky1f44a222013-06-27 09:01:09 +0200601config PCI_NR_MSI
602 int "Maximum number of MSI interrupts (64-32768)"
603 range 64 32768
604 default "256"
605 help
606 This defines the number of virtual interrupts the kernel will
607 provide for MSI interrupts. If you configure your system to have
608 too few drivers will fail to allocate MSI interrupts for all
609 PCI devices.
610
Jan Glauberc8717a32012-11-29 14:38:46 +0100611source "drivers/pci/Kconfig"
612source "drivers/pci/pcie/Kconfig"
613source "drivers/pci/hotplug/Kconfig"
614
615endif # PCI
616
617config PCI_DOMAINS
618 def_bool PCI
619
620config HAS_IOMEM
621 def_bool PCI
622
623config IOMMU_HELPER
624 def_bool PCI
625
626config HAS_DMA
627 def_bool PCI
628 select HAVE_DMA_API_DEBUG
629
630config NEED_SG_DMA_LENGTH
631 def_bool PCI
632
Jan Glauber91630032012-12-05 15:06:01 +0100633config NEED_DMA_MAP_STATE
634 def_bool PCI
635
Cornelia Huck9d92a7e2008-07-14 09:59:05 +0200636config CHSC_SCH
Sebastian Ottd9c11b12011-01-31 11:30:09 +0100637 def_tristate m
Martin Schwidefsky6f9a3c32011-01-05 12:47:15 +0100638 prompt "Support for CHSC subchannels"
Cornelia Huck9d92a7e2008-07-14 09:59:05 +0200639 help
640 This driver allows usage of CHSC subchannels. A CHSC subchannel
641 is usually present on LPAR only.
642 The driver creates a device /dev/chsc, which may be used to
643 obtain I/O configuration information about the machine and
644 to issue asynchronous chsc commands (DANGEROUS).
645 You will usually only want to use this interface on a special
646 LPAR designated for system management.
647
648 To compile this driver as a module, choose M here: the
649 module will be called chsc_sch.
650
651 If unsure, say N.
652
Sebastian Ott1d1c8f72012-08-28 16:46:26 +0200653config SCM_BUS
654 def_bool y
Sebastian Ott1d1c8f72012-08-28 16:46:26 +0200655 prompt "SCM bus driver"
656 help
657 Bus driver for Storage Class Memory.
658
Sebastian Otteadb86a2012-08-28 16:48:16 +0200659config EADM_SCH
660 def_tristate m
661 prompt "Support for EADM subchannels"
662 depends on SCM_BUS
663 help
664 This driver allows usage of EADM subchannels. EADM subchannels act
665 as a communication vehicle for SCM increments.
666
667 To compile this driver as a module, choose M here: the
668 module will be called eadm_sch.
669
Jan Glauber843c48f2012-08-27 10:55:18 +0200670endmenu
671
672menu "Dump support"
673
674config CRASH_DUMP
675 bool "kernel crash dumps"
Heiko Carstens5a798592015-02-12 13:08:27 +0100676 depends on SMP
Jan Glauber843c48f2012-08-27 10:55:18 +0200677 select KEXEC
678 help
679 Generate crash dump after being started by kexec.
680 Crash dump kernels are loaded in the main kernel with kexec-tools
681 into a specially reserved region and then later executed after
682 a crash by kdump/kexec.
Jan Glauber843c48f2012-08-27 10:55:18 +0200683 Refer to <file:Documentation/s390/zfcpdump.txt> for more details on this.
Michael Holzheubf28a592014-04-14 10:38:05 +0200684 This option also enables s390 zfcpdump.
685 See also <file:Documentation/s390/zfcpdump.txt>
Jan Glauber843c48f2012-08-27 10:55:18 +0200686
687endmenu
688
689menu "Executable file formats / Emulations"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700690
Linus Torvalds1da177e2005-04-16 15:20:36 -0700691source "fs/Kconfig.binfmt"
692
Jan Glauber843c48f2012-08-27 10:55:18 +0200693config SECCOMP
694 def_bool y
695 prompt "Enable seccomp to safely compute untrusted bytecode"
696 depends on PROC_FS
697 help
698 This kernel feature is useful for number crunching applications
699 that may need to compute untrusted bytecode during their
700 execution. By using pipes or other transports made available to
701 the process as file descriptors supporting the read/write
702 syscalls, it's possible to isolate those applications in
703 their own address space using seccomp. Once seccomp is
704 enabled via /proc/<pid>/seccomp, it cannot be disabled
705 and the task is only allowed to execute a few safe syscalls
706 defined by each seccomp mode.
707
708 If unsure, say Y.
709
710endmenu
711
712menu "Power Management"
713
714config ARCH_HIBERNATION_POSSIBLE
Heiko Carstens5a798592015-02-12 13:08:27 +0100715 def_bool y
Jan Glauber843c48f2012-08-27 10:55:18 +0200716
717source "kernel/power/Kconfig"
718
719endmenu
720
721source "net/Kconfig"
722
723config PCMCIA
724 def_bool n
725
726config CCW
727 def_bool y
728
729source "drivers/Kconfig"
730
731source "fs/Kconfig"
732
733source "arch/s390/Kconfig.debug"
734
735source "security/Kconfig"
736
737source "crypto/Kconfig"
738
739source "lib/Kconfig"
740
741menu "Virtualization"
Heiko Carstens684de392008-03-05 12:37:14 +0100742
Linus Torvalds1da177e2005-04-16 15:20:36 -0700743config PFAULT
Martin Schwidefsky6f9a3c32011-01-05 12:47:15 +0100744 def_bool y
745 prompt "Pseudo page fault support"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700746 help
747 Select this option, if you want to use PFAULT pseudo page fault
748 handling under VM. If running native or in LPAR, this option
749 has no effect. If your VM does not support PFAULT, PAGEEX
750 pseudo page fault handling will be used.
751 Note that VM 4.2 supports PFAULT but has a bug in its
752 implementation that causes some problems.
753 Everybody who wants to run Linux under VM != VM4.2 should select
754 this option.
755
756config SHARED_KERNEL
Heiko Carstens0eccc782012-09-25 14:53:15 +0200757 bool "VM shared kernel support"
758 depends on !JUMP_LABEL
Linus Torvalds1da177e2005-04-16 15:20:36 -0700759 help
760 Select this option, if you want to share the text segment of the
761 Linux kernel between different VM guests. This reduces memory
762 usage with lots of guests but greatly increases kernel size.
Heiko Carstens9c9c1762007-03-05 23:35:45 +0100763 Also if a kernel was IPL'ed from a shared segment the kexec system
764 call will not work.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700765 You should only select this option if you know what you are
766 doing and want to exploit this feature.
767
768config CMM
Martin Schwidefsky6f9a3c32011-01-05 12:47:15 +0100769 def_tristate n
770 prompt "Cooperative memory management"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700771 help
772 Select this option, if you want to enable the kernel interface
773 to reduce the memory size of the system. This is accomplished
774 by allocating pages of memory and put them "on hold". This only
775 makes sense for a system running under VM where the unused pages
776 will be reused by VM for other guest systems. The interface
777 allows an external monitor to balance memory of many systems.
778 Everybody who wants to run Linux under VM should select this
779 option.
780
Linus Torvalds1da177e2005-04-16 15:20:36 -0700781config CMM_IUCV
Martin Schwidefsky6f9a3c32011-01-05 12:47:15 +0100782 def_bool y
783 prompt "IUCV special message interface to cooperative memory management"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700784 depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV)
785 help
786 Select this option to enable the special message interface to
787 the cooperative memory management.
788
Linus Torvalds1da177e2005-04-16 15:20:36 -0700789config APPLDATA_BASE
Martin Schwidefsky6f9a3c32011-01-05 12:47:15 +0100790 def_bool n
791 prompt "Linux - VM Monitor Stream, base infrastructure"
Martin Schwidefskyc185b782008-12-25 13:39:25 +0100792 depends on PROC_FS
Linus Torvalds1da177e2005-04-16 15:20:36 -0700793 help
794 This provides a kernel interface for creating and updating z/VM APPLDATA
795 monitor records. The monitor records are updated at certain time
796 intervals, once the timer is started.
797 Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer,
798 i.e. enables or disables monitoring on the Linux side.
799 A custom interval value (in seconds) can be written to
800 /proc/appldata/interval.
801
802 Defaults are 60 seconds interval and timer off.
803 The /proc entries can also be read from, showing the current settings.
804
805config APPLDATA_MEM
Martin Schwidefsky6f9a3c32011-01-05 12:47:15 +0100806 def_tristate m
807 prompt "Monitor memory management statistics"
Al Viro62fb2ba2006-12-13 00:34:59 -0800808 depends on APPLDATA_BASE && VM_EVENT_COUNTERS
Linus Torvalds1da177e2005-04-16 15:20:36 -0700809 help
810 This provides memory management related data to the Linux - VM Monitor
811 Stream, like paging/swapping rate, memory utilisation, etc.
812 Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM
813 APPLDATA monitor record, i.e. enables or disables monitoring this record
814 on the z/VM side.
815
816 Default is disabled.
817 The /proc entry can also be read from, showing the current settings.
818
819 This can also be compiled as a module, which will be called
820 appldata_mem.o.
821
822config APPLDATA_OS
Martin Schwidefsky6f9a3c32011-01-05 12:47:15 +0100823 def_tristate m
824 prompt "Monitor OS statistics"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700825 depends on APPLDATA_BASE
826 help
827 This provides OS related data to the Linux - VM Monitor Stream, like
828 CPU utilisation, etc.
829 Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM
830 APPLDATA monitor record, i.e. enables or disables monitoring this record
831 on the z/VM side.
832
833 Default is disabled.
834 This can also be compiled as a module, which will be called
835 appldata_os.o.
836
837config APPLDATA_NET_SUM
Martin Schwidefsky6f9a3c32011-01-05 12:47:15 +0100838 def_tristate m
839 prompt "Monitor overall network statistics"
Sachin Sant70193af2009-03-26 15:24:00 +0100840 depends on APPLDATA_BASE && NET
Linus Torvalds1da177e2005-04-16 15:20:36 -0700841 help
842 This provides network related data to the Linux - VM Monitor Stream,
843 currently there is only a total sum of network I/O statistics, no
844 per-interface data.
845 Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM
846 APPLDATA monitor record, i.e. enables or disables monitoring this record
847 on the z/VM side.
848
849 Default is disabled.
850 This can also be compiled as a module, which will be called
851 appldata_net_sum.o.
852
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700853config S390_HYPFS_FS
Martin Schwidefsky6f9a3c32011-01-05 12:47:15 +0100854 def_bool y
855 prompt "s390 hypervisor file system support"
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700856 select SYS_HYPERVISOR
Michael Holzheu24bbb1f2006-06-23 02:05:06 -0700857 help
858 This is a virtual file system intended to provide accounting
859 information in an s390 hypervisor environment.
860
Jan Glauber843c48f2012-08-27 10:55:18 +0200861source "arch/s390/kvm/Kconfig"
Michael Holzheu411ed322007-04-27 16:01:49 +0200862
Carsten Ottefa587742008-03-25 18:47:44 +0100863config S390_GUEST
Martin Schwidefsky6f9a3c32011-01-05 12:47:15 +0100864 def_bool y
Kees Cook510cf5a2012-10-02 11:16:42 -0700865 prompt "s390 support for virtio devices"
Chen Gang79b6f7f2013-07-23 16:26:08 +0800866 select TTY
Christian Borntraeger80629b02011-06-22 16:24:07 +0200867 select VIRTUALIZATION
Carsten Ottefa587742008-03-25 18:47:44 +0100868 select VIRTIO
Christian Borntraegerfaeba8302008-06-20 15:24:18 +0200869 select VIRTIO_CONSOLE
Carsten Ottefa587742008-03-25 18:47:44 +0100870 help
Cornelia Huckbdd1fc22012-08-27 12:56:48 +0200871 Enabling this option adds support for virtio based paravirtual device
872 drivers on s390.
873
Christian Borntraeger20766c02008-08-29 13:30:56 +0200874 Select this option if you want to run the kernel as a guest under
Cornelia Huckbdd1fc22012-08-27 12:56:48 +0200875 the KVM hypervisor.
Heiko Carstensbcf5cef2009-06-12 10:26:26 +0200876
Linus Torvalds1da177e2005-04-16 15:20:36 -0700877endmenu