linux/arch/um/Kconfig.um
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   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 (EXPERIMENTAL)"
  49        depends on EXPERIMENTAL && 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 (EXPERIMENTAL)"
 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 (EXPERIMENTAL)"
 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
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