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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.
 12source "mm/Kconfig"
 13source "kernel/time/Kconfig"
 16	bool
 17	default y
 18	depends on STATIC_LINK
 20config LD_SCRIPT_DYN
 21	bool
 22	default y
 23	depends on !LD_SCRIPT_STATIC
 25source "fs/Kconfig.binfmt"
 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:
 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
 40          wishes to access.
 42          For more information, see
 43          <>.
 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.
 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.
 58	  See <> for more information.
 60	  You only need this if you are setting up a UML honeypot.  Otherwise,
 61	  it is safe to say 'N' here.
 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.
 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.
 78          It is safe to say 'Y' here.
 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.
 90	  This is the feature normally accomplished by pressing a key
 91	  while holding SysRq (Alt+PrintScreen).
 93	  On UML, this is accomplished by sending a "sysrq" command with
 94	  mconsole, followed by the letter for the requested command.
 96	  The keys are documented in <file:Documentation/sysrq.txt>. Don't say Y
 97	  unless you really know what this hack does.
 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.
107	  UML implements virtual SMP by allowing as many processes to run
108	  simultaneously on the host as there are virtual processors configured.
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.
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.
121	  If you don't know what to do, say N.
123config NR_CPUS
124	int "Maximum number of CPUs (2-32)"
125	range 2 32
126	depends on SMP
127	default "32"
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.
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.
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.