2 bool "Force a static link"
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
14 config LD_SCRIPT_STATIC
17 depends on STATIC_LINK
22 depends on !LD_SCRIPT_STATIC
23 select MODULE_REL_CRCS if MODVERSIONS
25 source "fs/Kconfig.binfmt"
28 tristate "Host filesystem"
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
36 mount none /tmp/fromhost -t hostfs -o /tmp/umlshare
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
42 For more information, see
43 <http://user-mode-linux.sourceforge.net/hostfs.html>.
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.
49 bool "Management console"
53 The user mode linux management console is a low-level interface to
54 the kernel, somewhat like the i386 SysRq interface. Since there is
55 a full-blown operating system running under every user mode linux
56 instance, there is much greater flexibility possible than with the
59 If you answer 'Y' to this option, to use this feature, you need the
60 mconsole client (called uml_mconsole) which is present in CVS in
61 2.4.5-9um and later (path /tools/mconsole), and is also in the
62 distribution RPM package in 2.4.6 and later.
64 It is safe to say 'Y' here.
67 bool "Magic SysRq key"
70 If you say Y here, you will have some control over the system even
71 if the system crashes for example during kernel debugging (e.g., you
72 will be able to flush the buffer cache to disk, reboot the system
73 immediately or dump some status information). A key for each of the
74 possible requests is provided.
76 This is the feature normally accomplished by pressing a key
77 while holding SysRq (Alt+PrintScreen).
79 On UML, this is accomplished by sending a "sysrq" command with
80 mconsole, followed by the letter for the requested command.
82 The keys are documented in <file:Documentation/sysrq.txt>. Don't say Y
83 unless you really know what this hack does.
85 config KERNEL_STACK_ORDER
86 int "Kernel stack size order"
91 This option determines the size of UML kernel stacks. They will
92 be 1 << order pages. The default is OK unless you're running Valgrind
93 on UML, in which case, set this to 3.
96 tristate "iomem emulation driver"
98 This driver allows a host file to be used as emulated IO memory inside
104 config PGTABLE_LEVELS
106 default 3 if 3_LEVEL_PGTABLES
111 prompt "Enable seccomp to safely compute untrusted bytecode"
113 This kernel feature is useful for number crunching applications
114 that may need to compute untrusted bytecode during their
115 execution. By using pipes or other transports made available to
116 the process as file descriptors supporting the read/write
117 syscalls, it's possible to isolate those applications in
118 their own address space using seccomp. Once seccomp is
119 enabled via prctl(PR_SET_SECCOMP), it cannot be disabled
120 and the task is only allowed to execute a few safe syscalls
121 defined by each seccomp mode.