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Linux/arch/um/Kconfig.um

  1 config 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 
 12 source "mm/Kconfig"
 13 
 14 config LD_SCRIPT_STATIC
 15         bool
 16         default y
 17         depends on STATIC_LINK
 18 
 19 config LD_SCRIPT_DYN
 20         bool
 21         default y
 22         depends on !LD_SCRIPT_STATIC
 23 
 24 source "fs/Kconfig.binfmt"
 25 
 26 config 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 
 47 config 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 
 62 config 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 
 79 config 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 
 98 config 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 
122 config NR_CPUS
123         int "Maximum number of CPUs (2-32)"
124         range 2 32
125         depends on SMP
126         default "32"
127 
128 config 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 
140 config 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 
150 config 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 
156 config NO_DMA
157         def_bool y

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