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Possible License(s): LGPL-2.0, AGPL-1.0, GPL-2.0
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 && EXPERIMENTAL 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.