blob: ec2b8da1aba483acb7e80b20c2c14041c81f4e7c [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001config STATIC_LINK
2 bool "Force a static link"
3 default n
Linus Torvalds1da177e2005-04-16 15:20:36 -07004 help
Jeff Dike4c9e1382007-10-16 01:26:54 -07005 This option gives you the ability to force a static link of UML.
6 Normally, UML is linked as a shared binary. This is inconvenient for
7 use in a chroot jail. So, if you intend to run UML inside a chroot,
8 you probably want to say Y here.
9 Additionally, this option enables using higher memory spaces (up to
10 2.75G) for UML.
Linus Torvalds1da177e2005-04-16 15:20:36 -070011
Dave Hansen3f22ab22005-06-23 00:07:43 -070012source "mm/Kconfig"
Jeff Diked83d2aa2007-10-16 01:27:23 -070013source "kernel/time/Kconfig"
Linus Torvalds1da177e2005-04-16 15:20:36 -070014
15config LD_SCRIPT_STATIC
16 bool
17 default y
Jeff Dike42fda662007-10-16 01:26:50 -070018 depends on STATIC_LINK
Linus Torvalds1da177e2005-04-16 15:20:36 -070019
20config LD_SCRIPT_DYN
21 bool
22 default y
23 depends on !LD_SCRIPT_STATIC
24
Linus Torvalds1da177e2005-04-16 15:20:36 -070025source "fs/Kconfig.binfmt"
26
27config HOSTFS
28 tristate "Host filesystem"
29 help
Jeff Dike4c9e1382007-10-16 01:26:54 -070030 While the User-Mode Linux port uses its own root file system for
31 booting and normal file access, this module lets the UML user
32 access files stored on the host. It does not require any
33 network connection between the Host and UML. An example use of
34 this might be:
Linus Torvalds1da177e2005-04-16 15:20:36 -070035
Jeff Dike4c9e1382007-10-16 01:26:54 -070036 mount none /tmp/fromhost -t hostfs -o /tmp/umlshare
Linus Torvalds1da177e2005-04-16 15:20:36 -070037
Jeff Dike4c9e1382007-10-16 01:26:54 -070038 where /tmp/fromhost is an empty directory inside UML and
39 /tmp/umlshare is a directory on the host with files the UML user
40 wishes to access.
Linus Torvalds1da177e2005-04-16 15:20:36 -070041
Jeff Dike4c9e1382007-10-16 01:26:54 -070042 For more information, see
43 <http://user-mode-linux.sourceforge.net/hostfs.html>.
Linus Torvalds1da177e2005-04-16 15:20:36 -070044
Jeff Dike4c9e1382007-10-16 01:26:54 -070045 If you'd like to be able to work with files stored on the host,
46 say Y or M here; otherwise say N.
Linus Torvalds1da177e2005-04-16 15:20:36 -070047
48config HPPFS
49 tristate "HoneyPot ProcFS (EXPERIMENTAL)"
Paolo 'Blaisorblade' Giarrussoce2d2ae2006-01-18 17:42:59 -080050 depends on EXPERIMENTAL
Linus Torvalds1da177e2005-04-16 15:20:36 -070051 help
Jeff Dike4c9e1382007-10-16 01:26:54 -070052 hppfs (HoneyPot ProcFS) is a filesystem which allows UML /proc
53 entries to be overridden, removed, or fabricated from the host.
54 Its purpose is to allow a UML to appear to be a physical machine
55 by removing or changing anything in /proc which gives away the
56 identity of a UML.
Linus Torvalds1da177e2005-04-16 15:20:36 -070057
Karol Swietlicki0ba9d3f2008-02-04 22:30:38 -080058 See <http://user-mode-linux.sf.net/old/hppfs.html> for more information.
Linus Torvalds1da177e2005-04-16 15:20:36 -070059
Jeff Dike4c9e1382007-10-16 01:26:54 -070060 You only need this if you are setting up a UML honeypot. Otherwise,
61 it is safe to say 'N' here.
Linus Torvalds1da177e2005-04-16 15:20:36 -070062
Linus Torvalds1da177e2005-04-16 15:20:36 -070063config MCONSOLE
64 bool "Management console"
65 default y
66 help
Jeff Dike4c9e1382007-10-16 01:26:54 -070067 The user mode linux management console is a low-level interface to
68 the kernel, somewhat like the i386 SysRq interface. Since there is
69 a full-blown operating system running under every user mode linux
70 instance, there is much greater flexibility possible than with the
71 SysRq mechanism.
Linus Torvalds1da177e2005-04-16 15:20:36 -070072
Jeff Dike4c9e1382007-10-16 01:26:54 -070073 If you answer 'Y' to this option, to use this feature, you need the
74 mconsole client (called uml_mconsole) which is present in CVS in
75 2.4.5-9um and later (path /tools/mconsole), and is also in the
76 distribution RPM package in 2.4.6 and later.
Linus Torvalds1da177e2005-04-16 15:20:36 -070077
Jeff Dike4c9e1382007-10-16 01:26:54 -070078 It is safe to say 'Y' here.
Linus Torvalds1da177e2005-04-16 15:20:36 -070079
80config MAGIC_SYSRQ
81 bool "Magic SysRq key"
82 depends on MCONSOLE
Jeff Dike4c9e1382007-10-16 01:26:54 -070083 help
84 If you say Y here, you will have some control over the system even
85 if the system crashes for example during kernel debugging (e.g., you
86 will be able to flush the buffer cache to disk, reboot the system
87 immediately or dump some status information). A key for each of the
88 possible requests is provided.
Linus Torvalds1da177e2005-04-16 15:20:36 -070089
Jeff Dike4c9e1382007-10-16 01:26:54 -070090 This is the feature normally accomplished by pressing a key
91 while holding SysRq (Alt+PrintScreen).
Linus Torvalds1da177e2005-04-16 15:20:36 -070092
Jeff Dike4c9e1382007-10-16 01:26:54 -070093 On UML, this is accomplished by sending a "sysrq" command with
94 mconsole, followed by the letter for the requested command.
Linus Torvalds1da177e2005-04-16 15:20:36 -070095
Jeff Dike4c9e1382007-10-16 01:26:54 -070096 The keys are documented in <file:Documentation/sysrq.txt>. Don't say Y
97 unless you really know what this hack does.
Linus Torvalds1da177e2005-04-16 15:20:36 -070098
Linus Torvalds1da177e2005-04-16 15:20:36 -070099config SMP
100 bool "Symmetric multi-processing support (EXPERIMENTAL)"
101 default n
Jeff Dike02bff1f2008-02-04 22:30:41 -0800102 depends on BROKEN
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103 help
Jeff Dike4c9e1382007-10-16 01:26:54 -0700104 This option enables UML SMP support.
105 It is NOT related to having a real SMP box. Not directly, at least.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106
Jeff Dike4c9e1382007-10-16 01:26:54 -0700107 UML implements virtual SMP by allowing as many processes to run
108 simultaneously on the host as there are virtual processors configured.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109
Jeff Dike4c9e1382007-10-16 01:26:54 -0700110 Obviously, if the host is a uniprocessor, those processes will
111 timeshare, but, inside UML, will appear to be running simultaneously.
112 If the host is a multiprocessor, then UML processes may run
113 simultaneously, depending on the host scheduler.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114
Jeff Dike4c9e1382007-10-16 01:26:54 -0700115 This, however, is supported only in TT mode. So, if you use the SKAS
116 patch on your host, switching to TT mode and enabling SMP usually
117 gives you worse performances.
118 Also, since the support for SMP has been under-developed, there could
119 be some bugs being exposed by enabling SMP.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120
Jeff Dike4c9e1382007-10-16 01:26:54 -0700121 If you don't know what to do, say N.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122
123config NR_CPUS
124 int "Maximum number of CPUs (2-32)"
125 range 2 32
126 depends on SMP
127 default "32"
128
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129config HIGHMEM
Paolo 'Blaisorblade' Giarrussoce2d2ae2006-01-18 17:42:59 -0800130 bool "Highmem support (EXPERIMENTAL)"
131 depends on !64BIT && EXPERIMENTAL
132 default n
133 help
Jeff Dike4c9e1382007-10-16 01:26:54 -0700134 This was used to allow UML to run with big amounts of memory.
135 Currently it is unstable, so if unsure say N.
Paolo 'Blaisorblade' Giarrussoce2d2ae2006-01-18 17:42:59 -0800136
Jeff Dike4c9e1382007-10-16 01:26:54 -0700137 To use big amounts of memory, it is recommended enable static
138 linking (i.e. CONFIG_STATIC_LINK) - this should allow the
139 guest to use up to 2.75G of memory.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140
141config KERNEL_STACK_ORDER
142 int "Kernel stack size order"
Jeff Dike02239c22007-05-10 22:22:35 -0700143 default 1 if 64BIT
Jeff Dikee80ad9b2007-06-08 13:46:49 -0700144 range 1 10 if 64BIT
Jeff Dike02239c22007-05-10 22:22:35 -0700145 default 0 if !64BIT
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146 help
Jeff Dike4c9e1382007-10-16 01:26:54 -0700147 This option determines the size of UML kernel stacks. They will
148 be 1 << order pages. The default is OK unless you're running Valgrind
149 on UML, in which case, set this to 3.