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" 13 14config LD_SCRIPT_STATIC 15 bool 16 default y 17 depends on STATIC_LINK 18 19config LD_SCRIPT_DYN 20 bool 21 default y 22 depends on !LD_SCRIPT_STATIC 23 24source "fs/Kconfig.binfmt" 25 26config HOSTFS 27 tristate "Host filesystem" 28 help 29 While the User-Mode Linux port uses its own root file system for 30 booting and normal file access, this module lets the UML user 31 access files stored on the host. It does not require any 32 network connection between the Host and UML. An example use of 33 this might be: 34 35 mount none /tmp/fromhost -t hostfs -o /tmp/umlshare 36 37 where /tmp/fromhost is an empty directory inside UML and 38 /tmp/umlshare is a directory on the host with files the UML user 39 wishes to access. 40 41 For more information, see 42 <http://user-mode-linux.sourceforge.net/hostfs.html>. 43 44 If you'd like to be able to work with files stored on the host, 45 say Y or M here; otherwise say N. 46 47config HPPFS 48 tristate "HoneyPot ProcFS" 49 depends on PROC_FS 50 help 51 hppfs (HoneyPot ProcFS) is a filesystem which allows UML /proc 52 entries to be overridden, removed, or fabricated from the host. 53 Its purpose is to allow a UML to appear to be a physical machine 54 by removing or changing anything in /proc which gives away the 55 identity of a UML. 56 57 See <http://user-mode-linux.sf.net/old/hppfs.html> for more information. 58 59 You only need this if you are setting up a UML honeypot. Otherwise, 60 it is safe to say 'N' here. 61 62config MCONSOLE 63 bool "Management console" 64 default y 65 help 66 The user mode linux management console is a low-level interface to 67 the kernel, somewhat like the i386 SysRq interface. Since there is 68 a full-blown operating system running under every user mode linux 69 instance, there is much greater flexibility possible than with the 70 SysRq mechanism. 71 72 If you answer 'Y' to this option, to use this feature, you need the 73 mconsole client (called uml_mconsole) which is present in CVS in 74 2.4.5-9um and later (path /tools/mconsole), and is also in the 75 distribution RPM package in 2.4.6 and later. 76 77 It is safe to say 'Y' here. 78 79config MAGIC_SYSRQ 80 bool "Magic SysRq key" 81 depends on MCONSOLE 82 help 83 If you say Y here, you will have some control over the system even 84 if the system crashes for example during kernel debugging (e.g., you 85 will be able to flush the buffer cache to disk, reboot the system 86 immediately or dump some status information). A key for each of the 87 possible requests is provided. 88 89 This is the feature normally accomplished by pressing a key 90 while holding SysRq (Alt+PrintScreen). 91 92 On UML, this is accomplished by sending a "sysrq" command with 93 mconsole, followed by the letter for the requested command. 94 95 The keys are documented in <file:Documentation/sysrq.txt>. Don't say Y 96 unless you really know what this hack does. 97 98config SMP 99 bool "Symmetric multi-processing support" 100 default n 101 depends on BROKEN 102 help 103 This option enables UML SMP support. 104 It is NOT related to having a real SMP box. Not directly, at least. 105 106 UML implements virtual SMP by allowing as many processes to run 107 simultaneously on the host as there are virtual processors configured. 108 109 Obviously, if the host is a uniprocessor, those processes will 110 timeshare, but, inside UML, will appear to be running simultaneously. 111 If the host is a multiprocessor, then UML processes may run 112 simultaneously, depending on the host scheduler. 113 114 This, however, is supported only in TT mode. So, if you use the SKAS 115 patch on your host, switching to TT mode and enabling SMP usually 116 gives you worse performances. 117 Also, since the support for SMP has been under-developed, there could 118 be some bugs being exposed by enabling SMP. 119 120 If you don't know what to do, say N. 121 122config NR_CPUS 123 int "Maximum number of CPUs (2-32)" 124 range 2 32 125 depends on SMP 126 default "32" 127 128config HIGHMEM 129 bool "Highmem support" 130 depends on !64BIT && BROKEN 131 default n 132 help 133 This was used to allow UML to run with big amounts of memory. 134 Currently it is unstable, so if unsure say N. 135 136 To use big amounts of memory, it is recommended enable static 137 linking (i.e. CONFIG_STATIC_LINK) - this should allow the 138 guest to use up to 2.75G of memory. 139 140config KERNEL_STACK_ORDER 141 int "Kernel stack size order" 142 default 1 if 64BIT 143 range 1 10 if 64BIT 144 default 0 if !64BIT 145 help 146 This option determines the size of UML kernel stacks. They will 147 be 1 << order pages. The default is OK unless you're running Valgrind 148 on UML, in which case, set this to 3. 149 150config MMAPPER 151 tristate "iomem emulation driver" 152 help 153 This driver allows a host file to be used as emulated IO memory inside 154 UML. 155 156config NO_DMA 157 def_bool y 158