1 # SPDX-License-Identifier: GPL-2.0
2
3 menu "UML-specific options"
4
5 config UML
6 bool
7 default y
8 select ARCH_HAS_CPU_FINALIZE_INIT
9 select ARCH_HAS_FORTIFY_SOURCE
10 select ARCH_HAS_GCOV_PROFILE_ALL
11 select ARCH_HAS_KCOV
12 select ARCH_HAS_STRNCPY_FROM_USER
13 select ARCH_HAS_STRNLEN_USER
14 select HAVE_ARCH_AUDITSYSCALL
15 select HAVE_ARCH_KASAN if X86_64
16 select HAVE_ARCH_KASAN_VMALLOC if HAVE
17 select HAVE_ARCH_SECCOMP_FILTER
18 select HAVE_ASM_MODVERSIONS
19 select HAVE_UID16
20 select HAVE_DEBUG_KMEMLEAK
21 select HAVE_DEBUG_BUGVERBOSE
22 select HAVE_PAGE_SIZE_4KB
23 select NO_DMA if !UML_DMA_EMULATION
24 select OF_EARLY_FLATTREE if OF
25 select GENERIC_IRQ_SHOW
26 select GENERIC_CPU_DEVICES
27 select HAVE_GCC_PLUGINS
28 select ARCH_SUPPORTS_LTO_CLANG
29 select ARCH_SUPPORTS_LTO_CLANG_THIN
30 select TRACE_IRQFLAGS_SUPPORT
31 select TTY # Needed for line.c
32 select HAVE_ARCH_VMAP_STACK
33 select HAVE_RUST
34 select ARCH_HAS_UBSAN
35
36 config MMU
37 bool
38 default y
39
40 config UML_DMA_EMULATION
41 bool
42
43 config NO_IOMEM
44 bool "disable IOMEM" if EXPERT
45 depends on !INDIRECT_IOMEM
46 default y
47
48 config UML_IOMEM_EMULATION
49 bool
50 select INDIRECT_IOMEM
51 select HAS_IOPORT
52 select GENERIC_PCI_IOMAP
53 select GENERIC_IOMAP
54 select NO_GENERIC_PCI_IOPORT_MAP
55
56 config NO_IOPORT_MAP
57 def_bool !UML_IOMEM_EMULATION
58
59 config ISA
60 bool
61
62 config SBUS
63 bool
64
65 config LOCKDEP_SUPPORT
66 bool
67 default y
68
69 config STACKTRACE_SUPPORT
70 bool
71 default y
72 select STACKTRACE
73
74 config GENERIC_CALIBRATE_DELAY
75 bool
76 default y
77
78 config HZ
79 int
80 default 100
81
82 config NR_CPUS
83 int
84 range 1 1
85 default 1
86
87 config ARCH_HAS_CACHE_LINE_SIZE
88 def_bool y
89
90 source "arch/$(HEADER_ARCH)/um/Kconfig"
91
92 config MAY_HAVE_RUNTIME_DEPS
93 bool
94
95 config STATIC_LINK
96 bool "Force a static link"
97 depends on CC_CAN_LINK_STATIC_NO_RUNTI
98 help
99 This option gives you the ability to
100 Normally, UML is linked as a shared
101 use in a chroot jail. So, if you in
102 you probably want to say Y here.
103 Additionally, this option enables us
104 2.75G) for UML.
105
106 NOTE: This option is incompatible wi
107 depend on features that require bein
108
109 config LD_SCRIPT_STATIC
110 bool
111 default y
112 depends on STATIC_LINK
113
114 config LD_SCRIPT_DYN
115 bool
116 default y
117 depends on !LD_SCRIPT_STATIC
118
119 config LD_SCRIPT_DYN_RPATH
120 bool "set rpath in the binary" if EXPE
121 default y
122 depends on LD_SCRIPT_DYN
123 help
124 Add /lib (and /lib64 for 64-bit) to
125 explicitly.
126
127 You may need to turn this off if com
128 that have their libraries in random
129 might otherwise unexpected use libra
130 instead of the desired ones.
131
132 config HOSTFS
133 tristate "Host filesystem"
134 help
135 While the User-Mode Linux port uses
136 booting and normal file access, this
137 access files stored on the host. It
138 network connection between the Host
139 this might be:
140
141 mount none /tmp/fromhost -t hostfs -
142
143 where /tmp/fromhost is an empty dire
144 /tmp/umlshare is a directory on the
145 wishes to access.
146
147 For more information, see
148 <http://user-mode-linux.sourceforge.
149
150 If you'd like to be able to work wit
151 say Y or M here; otherwise say N.
152
153 config MCONSOLE
154 bool "Management console"
155 depends on PROC_FS
156 default y
157 help
158 The user mode linux management conso
159 the kernel, somewhat like the i386 S
160 a full-blown operating system runnin
161 instance, there is much greater flex
162 SysRq mechanism.
163
164 If you answer 'Y' to this option, to
165 mconsole client (called uml_mconsole
166 2.4.5-9um and later (path /tools/mco
167 distribution RPM package in 2.4.6 an
168
169 It is safe to say 'Y' here.
170
171 config MAGIC_SYSRQ
172 bool "Magic SysRq key"
173 depends on MCONSOLE
174 help
175 If you say Y here, you will have som
176 if the system crashes for example du
177 will be able to flush the buffer cac
178 immediately or dump some status info
179 possible requests is provided.
180
181 This is the feature normally accompl
182 while holding SysRq (Alt+PrintScreen
183
184 On UML, this is accomplished by send
185 mconsole, followed by the letter for
186
187 The keys are documented in <file:Doc
188 unless you really know what this hac
189
190 config KERNEL_STACK_ORDER
191 int "Kernel stack size order"
192 default 2 if 64BIT
193 range 2 10 if 64BIT
194 default 1 if !64BIT
195 help
196 This option determines the size of U
197 be 1 << order pages. The default is
198 on UML, in which case, set this to 3
199 It is possible to reduce the stack t
200 older (pre-2017) CPUs. It is not rec
201 increase in the size of the state wh
202 signals.
203
204 config MMAPPER
205 tristate "iomem emulation driver"
206 help
207 This driver allows a host file to be
208 UML.
209
210 config PGTABLE_LEVELS
211 int
212 default 3 if 3_LEVEL_PGTABLES
213 default 2
214
215 config UML_TIME_TRAVEL_SUPPORT
216 bool
217 prompt "Support time-travel mode (e.g.
218 # inf-cpu mode is incompatible with th
219 depends on !RAID6_PQ_BENCHMARK
220 depends on !SMP
221 help
222 Enable this option to support time t
223
224 After enabling this option, two mode
225 (selected by the kernel command line
226 line help for more details.
227
228 It is safe to say Y, but you probabl
229
230 config KASAN_SHADOW_OFFSET
231 hex
232 depends on KASAN
233 default 0x100000000000
234 help
235 This is the offset at which the ~16T
236 mapped and used by KASAN for memory
237 address that has at least KASAN_SHAD
238 by 8) amount of space so that the KA
239 with anything. The default is 0x1000
240 set to a large value. On low-memory
241 into the immediate of most instructi
242
243 endmenu
244
245 source "arch/um/drivers/Kconfig"
246
247 config ARCH_SUSPEND_POSSIBLE
248 def_bool y
249
250 menu "Power management options"
251
252 source "kernel/power/Kconfig"
253
254 endmenu
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