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79b05c1f CH |
1 | # SPDX-License-Identifier: GPL-2.0 |
2 | ||
f163977d CH |
3 | menu "UML-specific options" |
4 | ||
5 | config UML | |
6 | bool | |
7 | default y | |
cb2c7d1a | 8 | select ARCH_EPHEMERAL_INODES |
f163977d | 9 | select ARCH_HAS_KCOV |
e6226997 AB |
10 | select ARCH_HAS_STRNCPY_FROM_USER |
11 | select ARCH_HAS_STRNLEN_USER | |
87a4c375 | 12 | select ARCH_NO_PREEMPT |
f163977d CH |
13 | select HAVE_ARCH_AUDITSYSCALL |
14 | select HAVE_ARCH_SECCOMP_FILTER | |
2ff2b7ec | 15 | select HAVE_ASM_MODVERSIONS |
f163977d | 16 | select HAVE_UID16 |
f163977d | 17 | select HAVE_DEBUG_KMEMLEAK |
0d76433c | 18 | select HAVE_DEBUG_BUGVERBOSE |
68f5d3f3 | 19 | select NO_DMA if !UML_DMA_EMULATION |
b31297f0 | 20 | select OF_EARLY_FLATTREE if OF |
f163977d CH |
21 | select GENERIC_IRQ_SHOW |
22 | select GENERIC_CPU_DEVICES | |
f163977d | 23 | select HAVE_GCC_PLUGINS |
4aae683f | 24 | select TRACE_IRQFLAGS_SUPPORT |
f163977d | 25 | select TTY # Needed for line.c |
bc5c49d7 | 26 | select HAVE_ARCH_VMAP_STACK |
f163977d CH |
27 | |
28 | config MMU | |
29 | bool | |
30 | default y | |
31 | ||
68f5d3f3 JB |
32 | config UML_DMA_EMULATION |
33 | bool | |
34 | ||
f163977d | 35 | config NO_IOMEM |
0bbadafd | 36 | bool "disable IOMEM" if EXPERT |
68f5d3f3 | 37 | depends on !INDIRECT_IOMEM |
0bbadafd JB |
38 | default y |
39 | ||
68f5d3f3 JB |
40 | config UML_IOMEM_EMULATION |
41 | bool | |
42 | select INDIRECT_IOMEM | |
43 | select GENERIC_PCI_IOMAP | |
44 | select GENERIC_IOMAP | |
45 | select NO_GENERIC_PCI_IOPORT_MAP | |
46 | ||
0bbadafd | 47 | config NO_IOPORT_MAP |
f163977d CH |
48 | def_bool y |
49 | ||
50 | config ISA | |
51 | bool | |
52 | ||
53 | config SBUS | |
54 | bool | |
55 | ||
f163977d CH |
56 | config LOCKDEP_SUPPORT |
57 | bool | |
58 | default y | |
59 | ||
60 | config STACKTRACE_SUPPORT | |
61 | bool | |
62 | default y | |
63 | select STACKTRACE | |
64 | ||
65 | config GENERIC_CALIBRATE_DELAY | |
66 | bool | |
67 | default y | |
68 | ||
69 | config HZ | |
70 | int | |
71 | default 100 | |
72 | ||
73 | config NR_CPUS | |
74 | int | |
75 | range 1 1 | |
76 | default 1 | |
77 | ||
d8fb32f4 AI |
78 | config ARCH_HAS_CACHE_LINE_SIZE |
79 | def_bool y | |
80 | ||
79b05c1f | 81 | source "arch/$(HEADER_ARCH)/um/Kconfig" |
f163977d | 82 | |
730586ff IK |
83 | config MAY_HAVE_RUNTIME_DEPS |
84 | bool | |
33631793 | 85 | |
f163977d CH |
86 | config STATIC_LINK |
87 | bool "Force a static link" | |
730586ff | 88 | depends on CC_CAN_LINK_STATIC_NO_RUNTIME_DEPS || !MAY_HAVE_RUNTIME_DEPS |
f163977d CH |
89 | help |
90 | This option gives you the ability to force a static link of UML. | |
91 | Normally, UML is linked as a shared binary. This is inconvenient for | |
92 | use in a chroot jail. So, if you intend to run UML inside a chroot, | |
93 | you probably want to say Y here. | |
94 | Additionally, this option enables using higher memory spaces (up to | |
95 | 2.75G) for UML. | |
96 | ||
33631793 BH |
97 | NOTE: This option is incompatible with some networking features which |
98 | depend on features that require being dynamically loaded (like NSS). | |
99 | ||
f163977d CH |
100 | config LD_SCRIPT_STATIC |
101 | bool | |
102 | default y | |
103 | depends on STATIC_LINK | |
104 | ||
105 | config LD_SCRIPT_DYN | |
106 | bool | |
107 | default y | |
108 | depends on !LD_SCRIPT_STATIC | |
37606596 | 109 | select MODULE_REL_CRCS if MODVERSIONS |
f163977d | 110 | |
386093c6 JB |
111 | config LD_SCRIPT_DYN_RPATH |
112 | bool "set rpath in the binary" if EXPERT | |
113 | default y | |
114 | depends on LD_SCRIPT_DYN | |
115 | help | |
116 | Add /lib (and /lib64 for 64-bit) to the linux binary's rpath | |
117 | explicitly. | |
118 | ||
119 | You may need to turn this off if compiling for nix systems | |
120 | that have their libraries in random /nix directories and | |
121 | might otherwise unexpected use libraries from /lib or /lib64 | |
122 | instead of the desired ones. | |
123 | ||
f163977d CH |
124 | config HOSTFS |
125 | tristate "Host filesystem" | |
126 | help | |
37606596 EWI |
127 | While the User-Mode Linux port uses its own root file system for |
128 | booting and normal file access, this module lets the UML user | |
129 | access files stored on the host. It does not require any | |
130 | network connection between the Host and UML. An example use of | |
131 | this might be: | |
f163977d | 132 | |
37606596 | 133 | mount none /tmp/fromhost -t hostfs -o /tmp/umlshare |
f163977d | 134 | |
37606596 EWI |
135 | where /tmp/fromhost is an empty directory inside UML and |
136 | /tmp/umlshare is a directory on the host with files the UML user | |
137 | wishes to access. | |
f163977d | 138 | |
37606596 EWI |
139 | For more information, see |
140 | <http://user-mode-linux.sourceforge.net/hostfs.html>. | |
f163977d | 141 | |
37606596 EWI |
142 | If you'd like to be able to work with files stored on the host, |
143 | say Y or M here; otherwise say N. | |
f163977d CH |
144 | |
145 | config MCONSOLE | |
146 | bool "Management console" | |
147 | depends on PROC_FS | |
148 | default y | |
149 | help | |
37606596 EWI |
150 | The user mode linux management console is a low-level interface to |
151 | the kernel, somewhat like the i386 SysRq interface. Since there is | |
152 | a full-blown operating system running under every user mode linux | |
153 | instance, there is much greater flexibility possible than with the | |
154 | SysRq mechanism. | |
155 | ||
156 | If you answer 'Y' to this option, to use this feature, you need the | |
157 | mconsole client (called uml_mconsole) which is present in CVS in | |
158 | 2.4.5-9um and later (path /tools/mconsole), and is also in the | |
159 | distribution RPM package in 2.4.6 and later. | |
160 | ||
161 | It is safe to say 'Y' here. | |
f163977d CH |
162 | |
163 | config MAGIC_SYSRQ | |
164 | bool "Magic SysRq key" | |
165 | depends on MCONSOLE | |
166 | help | |
167 | If you say Y here, you will have some control over the system even | |
168 | if the system crashes for example during kernel debugging (e.g., you | |
169 | will be able to flush the buffer cache to disk, reboot the system | |
170 | immediately or dump some status information). A key for each of the | |
171 | possible requests is provided. | |
172 | ||
173 | This is the feature normally accomplished by pressing a key | |
174 | while holding SysRq (Alt+PrintScreen). | |
175 | ||
176 | On UML, this is accomplished by sending a "sysrq" command with | |
177 | mconsole, followed by the letter for the requested command. | |
178 | ||
179 | The keys are documented in <file:Documentation/admin-guide/sysrq.rst>. Don't say Y | |
180 | unless you really know what this hack does. | |
181 | ||
182 | config KERNEL_STACK_ORDER | |
183 | int "Kernel stack size order" | |
5c2ffce1 AI |
184 | default 2 if 64BIT |
185 | range 2 10 if 64BIT | |
186 | default 1 if !64BIT | |
f163977d CH |
187 | help |
188 | This option determines the size of UML kernel stacks. They will | |
189 | be 1 << order pages. The default is OK unless you're running Valgrind | |
190 | on UML, in which case, set this to 3. | |
5c2ffce1 AI |
191 | It is possible to reduce the stack to 1 for 64BIT and 0 for 32BIT on |
192 | older (pre-2017) CPUs. It is not recommended on newer CPUs due to the | |
193 | increase in the size of the state which needs to be saved when handling | |
7d8093a5 | 194 | signals. |
f163977d CH |
195 | |
196 | config MMAPPER | |
197 | tristate "iomem emulation driver" | |
198 | help | |
199 | This driver allows a host file to be used as emulated IO memory inside | |
200 | UML. | |
201 | ||
f163977d CH |
202 | config PGTABLE_LEVELS |
203 | int | |
204 | default 3 if 3_LEVEL_PGTABLES | |
205 | default 2 | |
206 | ||
06503870 JB |
207 | config UML_TIME_TRAVEL_SUPPORT |
208 | bool | |
209 | prompt "Support time-travel mode (e.g. for test execution)" | |
d65197ad JB |
210 | # inf-cpu mode is incompatible with the benchmarking |
211 | depends on !RAID6_PQ_BENCHMARK | |
4b786e24 | 212 | depends on !SMP |
06503870 JB |
213 | help |
214 | Enable this option to support time travel inside the UML instance. | |
215 | ||
216 | After enabling this option, two modes are accessible at runtime | |
217 | (selected by the kernel command line), see the kernel's command- | |
218 | line help for more details. | |
219 | ||
220 | It is safe to say Y, but you probably don't need this. | |
221 | ||
f163977d CH |
222 | endmenu |
223 | ||
9bea1801 | 224 | source "arch/um/drivers/Kconfig" |
92dcd3d3 JB |
225 | |
226 | config ARCH_SUSPEND_POSSIBLE | |
227 | def_bool y | |
228 | ||
229 | source "kernel/power/Kconfig" |