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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 |
87a4c375 | 10 | select ARCH_NO_PREEMPT |
f163977d CH |
11 | select HAVE_ARCH_AUDITSYSCALL |
12 | select HAVE_ARCH_SECCOMP_FILTER | |
2ff2b7ec | 13 | select HAVE_ASM_MODVERSIONS |
f163977d CH |
14 | select HAVE_UID16 |
15 | select HAVE_FUTEX_CMPXCHG if FUTEX | |
16 | select HAVE_DEBUG_KMEMLEAK | |
0d76433c | 17 | select HAVE_DEBUG_BUGVERBOSE |
68f5d3f3 | 18 | select NO_DMA if !UML_DMA_EMULATION |
f163977d CH |
19 | select GENERIC_IRQ_SHOW |
20 | select GENERIC_CPU_DEVICES | |
f163977d | 21 | select HAVE_GCC_PLUGINS |
5e6e9852 | 22 | select SET_FS |
f163977d CH |
23 | select TTY # Needed for line.c |
24 | ||
25 | config MMU | |
26 | bool | |
27 | default y | |
28 | ||
68f5d3f3 JB |
29 | config UML_DMA_EMULATION |
30 | bool | |
31 | ||
f163977d | 32 | config NO_IOMEM |
0bbadafd | 33 | bool "disable IOMEM" if EXPERT |
68f5d3f3 | 34 | depends on !INDIRECT_IOMEM |
0bbadafd JB |
35 | default y |
36 | ||
68f5d3f3 JB |
37 | config UML_IOMEM_EMULATION |
38 | bool | |
39 | select INDIRECT_IOMEM | |
40 | select GENERIC_PCI_IOMAP | |
41 | select GENERIC_IOMAP | |
42 | select NO_GENERIC_PCI_IOPORT_MAP | |
43 | ||
0bbadafd | 44 | config NO_IOPORT_MAP |
f163977d CH |
45 | def_bool y |
46 | ||
47 | config ISA | |
48 | bool | |
49 | ||
50 | config SBUS | |
51 | bool | |
52 | ||
f163977d CH |
53 | config TRACE_IRQFLAGS_SUPPORT |
54 | bool | |
55 | default y | |
56 | ||
57 | config LOCKDEP_SUPPORT | |
58 | bool | |
59 | default y | |
60 | ||
61 | config STACKTRACE_SUPPORT | |
62 | bool | |
63 | default y | |
64 | select STACKTRACE | |
65 | ||
66 | config GENERIC_CALIBRATE_DELAY | |
67 | bool | |
68 | default y | |
69 | ||
70 | config HZ | |
71 | int | |
72 | default 100 | |
73 | ||
74 | config NR_CPUS | |
75 | int | |
76 | range 1 1 | |
77 | default 1 | |
78 | ||
79b05c1f | 79 | source "arch/$(HEADER_ARCH)/um/Kconfig" |
f163977d | 80 | |
730586ff IK |
81 | config MAY_HAVE_RUNTIME_DEPS |
82 | bool | |
33631793 | 83 | |
f163977d CH |
84 | config STATIC_LINK |
85 | bool "Force a static link" | |
730586ff | 86 | depends on CC_CAN_LINK_STATIC_NO_RUNTIME_DEPS || !MAY_HAVE_RUNTIME_DEPS |
f163977d CH |
87 | help |
88 | This option gives you the ability to force a static link of UML. | |
89 | Normally, UML is linked as a shared binary. This is inconvenient for | |
90 | use in a chroot jail. So, if you intend to run UML inside a chroot, | |
91 | you probably want to say Y here. | |
92 | Additionally, this option enables using higher memory spaces (up to | |
93 | 2.75G) for UML. | |
94 | ||
33631793 BH |
95 | NOTE: This option is incompatible with some networking features which |
96 | depend on features that require being dynamically loaded (like NSS). | |
97 | ||
f163977d CH |
98 | config LD_SCRIPT_STATIC |
99 | bool | |
100 | default y | |
101 | depends on STATIC_LINK | |
102 | ||
103 | config LD_SCRIPT_DYN | |
104 | bool | |
105 | default y | |
106 | depends on !LD_SCRIPT_STATIC | |
37606596 | 107 | select MODULE_REL_CRCS if MODVERSIONS |
f163977d | 108 | |
386093c6 JB |
109 | config LD_SCRIPT_DYN_RPATH |
110 | bool "set rpath in the binary" if EXPERT | |
111 | default y | |
112 | depends on LD_SCRIPT_DYN | |
113 | help | |
114 | Add /lib (and /lib64 for 64-bit) to the linux binary's rpath | |
115 | explicitly. | |
116 | ||
117 | You may need to turn this off if compiling for nix systems | |
118 | that have their libraries in random /nix directories and | |
119 | might otherwise unexpected use libraries from /lib or /lib64 | |
120 | instead of the desired ones. | |
121 | ||
f163977d CH |
122 | config HOSTFS |
123 | tristate "Host filesystem" | |
124 | help | |
37606596 EWI |
125 | While the User-Mode Linux port uses its own root file system for |
126 | booting and normal file access, this module lets the UML user | |
127 | access files stored on the host. It does not require any | |
128 | network connection between the Host and UML. An example use of | |
129 | this might be: | |
f163977d | 130 | |
37606596 | 131 | mount none /tmp/fromhost -t hostfs -o /tmp/umlshare |
f163977d | 132 | |
37606596 EWI |
133 | where /tmp/fromhost is an empty directory inside UML and |
134 | /tmp/umlshare is a directory on the host with files the UML user | |
135 | wishes to access. | |
f163977d | 136 | |
37606596 EWI |
137 | For more information, see |
138 | <http://user-mode-linux.sourceforge.net/hostfs.html>. | |
f163977d | 139 | |
37606596 EWI |
140 | If you'd like to be able to work with files stored on the host, |
141 | say Y or M here; otherwise say N. | |
f163977d CH |
142 | |
143 | config MCONSOLE | |
144 | bool "Management console" | |
145 | depends on PROC_FS | |
146 | default y | |
147 | help | |
37606596 EWI |
148 | The user mode linux management console is a low-level interface to |
149 | the kernel, somewhat like the i386 SysRq interface. Since there is | |
150 | a full-blown operating system running under every user mode linux | |
151 | instance, there is much greater flexibility possible than with the | |
152 | SysRq mechanism. | |
153 | ||
154 | If you answer 'Y' to this option, to use this feature, you need the | |
155 | mconsole client (called uml_mconsole) which is present in CVS in | |
156 | 2.4.5-9um and later (path /tools/mconsole), and is also in the | |
157 | distribution RPM package in 2.4.6 and later. | |
158 | ||
159 | It is safe to say 'Y' here. | |
f163977d CH |
160 | |
161 | config MAGIC_SYSRQ | |
162 | bool "Magic SysRq key" | |
163 | depends on MCONSOLE | |
164 | help | |
165 | If you say Y here, you will have some control over the system even | |
166 | if the system crashes for example during kernel debugging (e.g., you | |
167 | will be able to flush the buffer cache to disk, reboot the system | |
168 | immediately or dump some status information). A key for each of the | |
169 | possible requests is provided. | |
170 | ||
171 | This is the feature normally accomplished by pressing a key | |
172 | while holding SysRq (Alt+PrintScreen). | |
173 | ||
174 | On UML, this is accomplished by sending a "sysrq" command with | |
175 | mconsole, followed by the letter for the requested command. | |
176 | ||
177 | The keys are documented in <file:Documentation/admin-guide/sysrq.rst>. Don't say Y | |
178 | unless you really know what this hack does. | |
179 | ||
180 | config KERNEL_STACK_ORDER | |
181 | int "Kernel stack size order" | |
5c2ffce1 AI |
182 | default 2 if 64BIT |
183 | range 2 10 if 64BIT | |
184 | default 1 if !64BIT | |
f163977d CH |
185 | help |
186 | This option determines the size of UML kernel stacks. They will | |
187 | be 1 << order pages. The default is OK unless you're running Valgrind | |
188 | on UML, in which case, set this to 3. | |
5c2ffce1 AI |
189 | It is possible to reduce the stack to 1 for 64BIT and 0 for 32BIT on |
190 | older (pre-2017) CPUs. It is not recommended on newer CPUs due to the | |
191 | increase in the size of the state which needs to be saved when handling | |
7d8093a5 | 192 | signals. |
f163977d CH |
193 | |
194 | config MMAPPER | |
195 | tristate "iomem emulation driver" | |
196 | help | |
197 | This driver allows a host file to be used as emulated IO memory inside | |
198 | UML. | |
199 | ||
f163977d CH |
200 | config PGTABLE_LEVELS |
201 | int | |
202 | default 3 if 3_LEVEL_PGTABLES | |
203 | default 2 | |
204 | ||
06503870 JB |
205 | config UML_TIME_TRAVEL_SUPPORT |
206 | bool | |
207 | prompt "Support time-travel mode (e.g. for test execution)" | |
d65197ad JB |
208 | # inf-cpu mode is incompatible with the benchmarking |
209 | depends on !RAID6_PQ_BENCHMARK | |
4b786e24 | 210 | depends on !SMP |
06503870 JB |
211 | help |
212 | Enable this option to support time travel inside the UML instance. | |
213 | ||
214 | After enabling this option, two modes are accessible at runtime | |
215 | (selected by the kernel command line), see the kernel's command- | |
216 | line help for more details. | |
217 | ||
218 | It is safe to say Y, but you probably don't need this. | |
219 | ||
f163977d CH |
220 | endmenu |
221 | ||
9bea1801 | 222 | source "arch/um/drivers/Kconfig" |
92dcd3d3 JB |
223 | |
224 | config ARCH_SUSPEND_POSSIBLE | |
225 | def_bool y | |
226 | ||
227 | source "kernel/power/Kconfig" |