Root/arch/um/Kconfig.um

1config STATIC_LINK
2    bool "Force a static link"
3    default n
4    help
5      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.
11
12source "mm/Kconfig"
13source "kernel/time/Kconfig"
14
15config LD_SCRIPT_STATIC
16    bool
17    default y
18    depends on STATIC_LINK
19
20config LD_SCRIPT_DYN
21    bool
22    default y
23    depends on !LD_SCRIPT_STATIC
24
25source "fs/Kconfig.binfmt"
26
27config HOSTFS
28    tristate "Host filesystem"
29    help
30          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:
35
36          mount none /tmp/fromhost -t hostfs -o /tmp/umlshare
37
38          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.
41
42          For more information, see
43          <http://user-mode-linux.sourceforge.net/hostfs.html>.
44
45          If you'd like to be able to work with files stored on the host,
46          say Y or M here; otherwise say N.
47
48config HPPFS
49    tristate "HoneyPot ProcFS (EXPERIMENTAL)"
50    depends on EXPERIMENTAL
51    help
52      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.
57
58      See <http://user-mode-linux.sf.net/old/hppfs.html> for more information.
59
60      You only need this if you are setting up a UML honeypot. Otherwise,
61      it is safe to say 'N' here.
62
63config MCONSOLE
64    bool "Management console"
65    default y
66    help
67          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.
72
73          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.
77
78          It is safe to say 'Y' here.
79
80config MAGIC_SYSRQ
81    bool "Magic SysRq key"
82    depends on MCONSOLE
83    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.
89
90      This is the feature normally accomplished by pressing a key
91      while holding SysRq (Alt+PrintScreen).
92
93      On UML, this is accomplished by sending a "sysrq" command with
94      mconsole, followed by the letter for the requested command.
95
96      The keys are documented in <file:Documentation/sysrq.txt>. Don't say Y
97      unless you really know what this hack does.
98
99config SMP
100    bool "Symmetric multi-processing support (EXPERIMENTAL)"
101    default n
102    depends on BROKEN
103    help
104      This option enables UML SMP support.
105      It is NOT related to having a real SMP box. Not directly, at least.
106
107      UML implements virtual SMP by allowing as many processes to run
108      simultaneously on the host as there are virtual processors configured.
109
110      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.
114
115      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.
120
121      If you don't know what to do, say N.
122
123config NR_CPUS
124    int "Maximum number of CPUs (2-32)"
125    range 2 32
126    depends on SMP
127    default "32"
128
129config HIGHMEM
130    bool "Highmem support (EXPERIMENTAL)"
131    depends on !64BIT && BROKEN
132    default n
133    help
134      This was used to allow UML to run with big amounts of memory.
135      Currently it is unstable, so if unsure say N.
136
137      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.
140
141config KERNEL_STACK_ORDER
142    int "Kernel stack size order"
143    default 1 if 64BIT
144    range 1 10 if 64BIT
145    default 0 if !64BIT
146    help
147      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.
150
151config NO_DMA
152    def_bool y
153

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