4 default "arch/$ARCH/defconfig"
6 # UML uses the generic IRQ sugsystem
7 config GENERIC_HARDIRQS
22 mainmenu "Linux/Usermode Kernel Configuration"
37 config TRACE_IRQFLAGS_SUPPORT
41 config LOCKDEP_SUPPORT
45 config STACKTRACE_SUPPORT
49 config GENERIC_CALIBRATE_DELAY
58 # Used in kernel/irq/manage.c and include/linux/irq.h
59 config IRQ_RELEASE_METHOD
63 menu "UML-specific options"
66 bool "Force a static link"
69 This option gives you the ability to force a static link of UML.
70 Normally, UML is linked as a shared binary. This is inconvenient for
71 use in a chroot jail. So, if you intend to run UML inside a chroot,
72 you probably want to say Y here.
73 Additionally, this option enables using higher memory spaces (up to
76 source "arch/um/Kconfig.arch"
79 config LD_SCRIPT_STATIC
82 depends on STATIC_LINK
87 depends on !LD_SCRIPT_STATIC
90 bool "Networking support"
92 Unless you really know what you are doing, you should say Y here.
93 The reason is that some programs need kernel networking support even
94 when running on a stand-alone machine that isn't connected to any
95 other computer. If you are upgrading from an older kernel, you
96 should consider updating your networking tools too because changes
97 in the kernel and the tools often go hand in hand. The tools are
98 contained in the package net-tools, the location and version number
99 of which are given in <file:Documentation/Changes>.
101 For a general introduction to Linux networking, it is highly
102 recommended to read the NET-HOWTO, available from
103 <http://www.tldp.org/docs.html#howto>.
106 source "fs/Kconfig.binfmt"
109 tristate "Host filesystem"
111 While the User-Mode Linux port uses its own root file system for
112 booting and normal file access, this module lets the UML user
113 access files stored on the host. It does not require any
114 network connection between the Host and UML. An example use of
117 mount none /tmp/fromhost -t hostfs -o /tmp/umlshare
119 where /tmp/fromhost is an empty directory inside UML and
120 /tmp/umlshare is a directory on the host with files the UML user
123 For more information, see
124 <http://user-mode-linux.sourceforge.net/hostfs.html>.
126 If you'd like to be able to work with files stored on the host,
127 say Y or M here; otherwise say N.
130 tristate "HoneyPot ProcFS (EXPERIMENTAL)"
131 depends on EXPERIMENTAL
133 hppfs (HoneyPot ProcFS) is a filesystem which allows UML /proc
134 entries to be overridden, removed, or fabricated from the host.
135 Its purpose is to allow a UML to appear to be a physical machine
136 by removing or changing anything in /proc which gives away the
139 See <http://user-mode-linux.sf.net/hppfs.html> for more information.
141 You only need this if you are setting up a UML honeypot. Otherwise,
142 it is safe to say 'N' here.
145 bool "Management console"
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
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.
159 It is safe to say 'Y' here.
162 bool "Magic SysRq key"
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.
171 This is the feature normally accomplished by pressing a key
172 while holding SysRq (Alt+PrintScreen).
174 On UML, this is accomplished by sending a "sysrq" command with
175 mconsole, followed by the letter for the requested command.
177 The keys are documented in <file:Documentation/sysrq.txt>. Don't say Y
178 unless you really know what this hack does.
181 bool "Symmetric multi-processing support (EXPERIMENTAL)"
183 #SMP_BROKEN is for x86_64.
184 depends on EXPERIMENTAL && (!SMP_BROKEN || (BROKEN && SMP_BROKEN))
186 This option enables UML SMP support.
187 It is NOT related to having a real SMP box. Not directly, at least.
189 UML implements virtual SMP by allowing as many processes to run
190 simultaneously on the host as there are virtual processors configured.
192 Obviously, if the host is a uniprocessor, those processes will
193 timeshare, but, inside UML, will appear to be running simultaneously.
194 If the host is a multiprocessor, then UML processes may run
195 simultaneously, depending on the host scheduler.
197 This, however, is supported only in TT mode. So, if you use the SKAS
198 patch on your host, switching to TT mode and enabling SMP usually gives
199 you worse performances.
200 Also, since the support for SMP has been under-developed, there could
201 be some bugs being exposed by enabling SMP.
203 If you don't know what to do, say N.
206 int "Maximum number of CPUs (2-32)"
215 This is set to the number of layers of UMLs that this UML will be run
216 in. Normally, this is zero, meaning that it will run directly on the
217 host. Setting it to one will build a UML that can run inside a UML
218 that is running on the host. Generally, if you intend this UML to run
219 inside another UML, set CONFIG_NEST_LEVEL to one more than the host
223 bool "Highmem support (EXPERIMENTAL)"
224 depends on !64BIT && EXPERIMENTAL
227 This was used to allow UML to run with big amounts of memory.
228 Currently it is unstable, so if unsure say N.
230 To use big amounts of memory, it is recommended enable static
231 linking (i.e. CONFIG_STATIC_LINK) - this should allow the
232 guest to use up to 2.75G of memory.
234 config KERNEL_STACK_ORDER
235 int "Kernel stack size order"
240 This option determines the size of UML kernel stacks. They will
241 be 1 << order pages. The default is OK unless you're running Valgrind
242 on UML, in which case, set this to 3.
244 config UML_REAL_TIME_CLOCK
245 bool "Real-time Clock"
248 This option makes UML time deltas match wall clock deltas. This should
249 normally be enabled. The exception would be if you are debugging with
250 UML and spend long times with UML stopped at a breakpoint. In this
251 case, when UML is restarted, it will call the timer enough times to make
252 up for the time spent at the breakpoint. This could result in a
253 noticeable lag. If this is a problem, then disable this option.
257 source "init/Kconfig"
259 source "drivers/block/Kconfig"
261 source "arch/um/Kconfig.char"
263 source "drivers/base/Kconfig"
267 source "arch/um/Kconfig.net"
269 source "drivers/net/Kconfig"
271 source "drivers/connector/Kconfig"
275 source "security/Kconfig"
277 source "crypto/Kconfig"
281 source "drivers/scsi/Kconfig"
283 source "drivers/md/Kconfig"
286 source "drivers/mtd/Kconfig"
289 #This is just to shut up some Kconfig warnings, so no prompt.
294 source "arch/um/Kconfig.debug"