4 default "arch/$ARCH/defconfig"
6 # UML uses the generic IRQ subsystem
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
62 config GENERIC_CLOCKEVENTS
66 # Used in kernel/irq/manage.c and include/linux/irq.h
67 config IRQ_RELEASE_METHOD
71 menu "UML-specific options"
74 bool "Force a static link"
77 This option gives you the ability to force a static link of UML.
78 Normally, UML is linked as a shared binary. This is inconvenient for
79 use in a chroot jail. So, if you intend to run UML inside a chroot,
80 you probably want to say Y here.
81 Additionally, this option enables using higher memory spaces (up to
84 source "arch/um/Kconfig.arch"
86 source "kernel/time/Kconfig"
88 config LD_SCRIPT_STATIC
91 depends on STATIC_LINK
96 depends on !LD_SCRIPT_STATIC
99 bool "Networking support"
101 Unless you really know what you are doing, you should say Y here.
102 The reason is that some programs need kernel networking support even
103 when running on a stand-alone machine that isn't connected to any
104 other computer. If you are upgrading from an older kernel, you
105 should consider updating your networking tools too because changes
106 in the kernel and the tools often go hand in hand. The tools are
107 contained in the package net-tools, the location and version number
108 of which are given in <file:Documentation/Changes>.
110 For a general introduction to Linux networking, it is highly
111 recommended to read the NET-HOWTO, available from
112 <http://www.tldp.org/docs.html#howto>.
115 source "fs/Kconfig.binfmt"
118 tristate "Host filesystem"
120 While the User-Mode Linux port uses its own root file system for
121 booting and normal file access, this module lets the UML user
122 access files stored on the host. It does not require any
123 network connection between the Host and UML. An example use of
126 mount none /tmp/fromhost -t hostfs -o /tmp/umlshare
128 where /tmp/fromhost is an empty directory inside UML and
129 /tmp/umlshare is a directory on the host with files the UML user
132 For more information, see
133 <http://user-mode-linux.sourceforge.net/hostfs.html>.
135 If you'd like to be able to work with files stored on the host,
136 say Y or M here; otherwise say N.
139 tristate "HoneyPot ProcFS (EXPERIMENTAL)"
140 depends on EXPERIMENTAL
142 hppfs (HoneyPot ProcFS) is a filesystem which allows UML /proc
143 entries to be overridden, removed, or fabricated from the host.
144 Its purpose is to allow a UML to appear to be a physical machine
145 by removing or changing anything in /proc which gives away the
148 See <http://user-mode-linux.sf.net/old/hppfs.html> for more information.
150 You only need this if you are setting up a UML honeypot. Otherwise,
151 it is safe to say 'N' here.
154 bool "Management console"
157 The user mode linux management console is a low-level interface to
158 the kernel, somewhat like the i386 SysRq interface. Since there is
159 a full-blown operating system running under every user mode linux
160 instance, there is much greater flexibility possible than with the
163 If you answer 'Y' to this option, to use this feature, you need the
164 mconsole client (called uml_mconsole) which is present in CVS in
165 2.4.5-9um and later (path /tools/mconsole), and is also in the
166 distribution RPM package in 2.4.6 and later.
168 It is safe to say 'Y' here.
171 bool "Magic SysRq key"
174 If you say Y here, you will have some control over the system even
175 if the system crashes for example during kernel debugging (e.g., you
176 will be able to flush the buffer cache to disk, reboot the system
177 immediately or dump some status information). A key for each of the
178 possible requests is provided.
180 This is the feature normally accomplished by pressing a key
181 while holding SysRq (Alt+PrintScreen).
183 On UML, this is accomplished by sending a "sysrq" command with
184 mconsole, followed by the letter for the requested command.
186 The keys are documented in <file:Documentation/sysrq.txt>. Don't say Y
187 unless you really know what this hack does.
190 bool "Symmetric multi-processing support (EXPERIMENTAL)"
194 This option enables UML SMP support.
195 It is NOT related to having a real SMP box. Not directly, at least.
197 UML implements virtual SMP by allowing as many processes to run
198 simultaneously on the host as there are virtual processors configured.
200 Obviously, if the host is a uniprocessor, those processes will
201 timeshare, but, inside UML, will appear to be running simultaneously.
202 If the host is a multiprocessor, then UML processes may run
203 simultaneously, depending on the host scheduler.
205 This, however, is supported only in TT mode. So, if you use the SKAS
206 patch on your host, switching to TT mode and enabling SMP usually
207 gives you worse performances.
208 Also, since the support for SMP has been under-developed, there could
209 be some bugs being exposed by enabling SMP.
211 If you don't know what to do, say N.
214 int "Maximum number of CPUs (2-32)"
223 This is set to the number of layers of UMLs that this UML will be run
224 in. Normally, this is zero, meaning that it will run directly on the
225 host. Setting it to one will build a UML that can run inside a UML
226 that is running on the host. Generally, if you intend this UML to run
227 inside another UML, set CONFIG_NEST_LEVEL to one more than the host
231 bool "Highmem support (EXPERIMENTAL)"
232 depends on !64BIT && EXPERIMENTAL
235 This was used to allow UML to run with big amounts of memory.
236 Currently it is unstable, so if unsure say N.
238 To use big amounts of memory, it is recommended enable static
239 linking (i.e. CONFIG_STATIC_LINK) - this should allow the
240 guest to use up to 2.75G of memory.
242 config KERNEL_STACK_ORDER
243 int "Kernel stack size order"
248 This option determines the size of UML kernel stacks. They will
249 be 1 << order pages. The default is OK unless you're running Valgrind
250 on UML, in which case, set this to 3.
254 source "init/Kconfig"
256 source "drivers/block/Kconfig"
258 source "arch/um/Kconfig.char"
260 source "drivers/base/Kconfig"
264 source "arch/um/Kconfig.net"
266 source "drivers/net/Kconfig"
268 source "drivers/connector/Kconfig"
272 source "security/Kconfig"
274 source "crypto/Kconfig"
278 source "drivers/scsi/Kconfig"
280 source "drivers/md/Kconfig"
283 source "drivers/mtd/Kconfig"
286 #This is just to shut up some Kconfig warnings, so no prompt.
291 source "arch/um/Kconfig.debug"