5 # XXX: does UM have a mmu/swap?
10 mainmenu "Linux/Usermode Kernel Configuration"
25 config RWSEM_GENERIC_SPINLOCK
29 menu "UML-specific options"
32 bool "Tracing thread support"
35 This option controls whether tracing thread support is compiled
36 into UML. Normally, this should be set to Y. If you intend to
37 use only skas mode (and the host has the skas patch applied to it),
38 then it is OK to say N here.
41 bool "Force a static link"
45 If CONFIG_MODE_TT is disabled, then this option gives you the ability
46 to force a static link of UML. Normally, if only skas mode is built
47 in to UML, it will be linked as a shared binary. This is inconvenient
48 for use in a chroot jail. So, if you intend to run UML inside a
49 chroot, and you disable CONFIG_MODE_TT, you probably want to say Y
53 bool "Separate Kernel Address Space support"
56 This option controls whether skas (separate kernel address space)
57 support is compiled in. If you have applied the skas patch to the
58 host, then you certainly want to say Y here (and consider saying N
59 to CONFIG_MODE_TT). Otherwise, it is safe to say Y. Disabling this
60 option will shrink the UML binary slightly.
63 bool "Networking support"
66 tristate "Kernel support for a.out binaries"
69 tristate "Kernel support for ELF binaries"
72 tristate "Kernel support for MISC binaries"
75 tristate "Host filesystem"
77 While the User-Mode Linux port uses its own root file system for
78 booting and normal file access, this module lets the UML user
79 access files stored on the host. It does not require any
80 network connection between the Host and UML. An example use of
83 mount none /tmp/fromhost -t hostfs -o /tmp/umlshare
85 where /tmp/fromhost is an empty directory inside UML and
86 /tmp/umlshare is a directory on the host with files the UML user
89 For more information, see
90 <http://user-mode-linux.sourceforge.net/hostfs.html>.
92 If you'd like to be able to work with files stored on the host,
93 say Y or M here; otherwise say N.
97 bool "Management console"
99 The user mode linux management console is a low-level interface to
100 the kernel, somewhat like the i386 SysRq interface. Since there is
101 a full-blown operating system running under every user mode linux
102 instance, there is much greater flexibility possible than with the
105 If you answer 'Y' to this option, to use this feature, you need the
106 mconsole client (called uml_mconsole) which is present in CVS in
107 2.4.5-9um and later (path /tools/mconsole), and is also in the
108 distribution RPM package in 2.4.6 and later.
110 It is safe to say 'Y' here.
113 bool "Magic SysRq key"
117 bool "2G/2G host address space split"
120 bool "Symmetric multi-processing support"
122 This option enables UML SMP support. UML implements virtual SMP by
123 allowing as many processes to run simultaneously on the host as
124 there are virtual processors configured. Obviously, if the host is
125 a uniprocessor, those processes will timeshare, but, inside UML,
126 will appear to be running simultaneously. If the host is a
127 multiprocessor, then UML processes may run simultaneously, depending
128 on the host scheduler.
129 CONFIG_SMP will be set to whatever this option is set to.
130 It is safe to leave this unchanged.
137 int "Maximum number of CPUs (2-32)"
145 This is set to the number of layers of UMLs that this UML will be run
146 in. Normally, this is zero, meaning that it will run directly on the
147 host. Setting it to one will build a UML that can run inside a UML
148 that is running on the host. Generally, if you intend this UML to run
149 inside another UML, set CONFIG_NEST_LEVEL to one more than the host
152 Note that if the hosting UML has its CONFIG_KERNEL_HALF_GIGS set to
153 greater than one, then the guest UML should have its CONFIG_NEST_LEVEL
154 set to the host's CONFIG_NEST_LEVEL + CONFIG_KERNEL_HALF_GIGS.
155 Only change this if you are running nested UMLs.
157 config KERNEL_HALF_GIGS
158 int "Kernel address space size (in .5G units)"
161 This determines the amount of address space that UML will allocate for
162 its own, measured in half Gigabyte units. The default is 1.
163 Change this only if you need to boot UML with an unusually large amount
167 bool "Highmem support"
169 config KERNEL_STACK_ORDER
170 int "Kernel stack size order"
173 This option determines the size of UML kernel stacks. They will
174 be 1 << order pages. The default is OK unless you're running Valgrind
175 on UML, in which case, set this to 3.
179 source "init/Kconfig"
181 source "arch/um/Kconfig_char"
183 source "arch/um/Kconfig_block"
189 source "arch/um/Kconfig_net"
195 source "security/Kconfig"
197 source "crypto/Kconfig"
204 tristate "SCSI support"
206 # This gives us free_dma, which scsi.c wants.
207 config GENERIC_ISA_DMA
212 source "arch/um/Kconfig_scsi"
216 source "drivers/md/Kconfig"
218 source "drivers/mtd/Kconfig"
221 menu "Kernel hacking"
224 bool "Debug memory allocations"
226 config DEBUG_SPINLOCK
227 bool "Debug spinlocks usage"
230 bool "Enable kernel debugging symbols"
232 When this is enabled, the User-Mode Linux binary will include
233 debugging symbols. This enlarges the binary by a few megabytes,
234 but aids in tracking down kernel problems in UML. It is required
235 if you intend to do any kernel development.
237 If you're truly short on disk space or don't expect to report any
238 bugs back to the UML developers, say N, otherwise say Y.
242 default y if DEBUGSYM
245 bool "Enable ptrace proxy"
246 depends on XTERM_CHAN && DEBUGSYM
249 bool "Enable gprof support"
252 This allows profiling of a User-Mode Linux kernel with the gprof
255 See <http://user-mode-linux.sourceforge.net/gprof.html> for more
258 If you're involved in UML kernel development and want to use gprof,
259 say Y. If you're unsure, say N.
262 bool "Enable gcov support"
265 This option allows developers to retrieve coverage data from a UML
268 See <http://user-mode-linux.sourceforge.net/gcov.html> for more
271 If you're involved in UML kernel development and want to use gcov,
272 say Y. If you're unsure, say N.
276 source "suse/Kconfig"