| config STATIC_LINK |
| bool "Force a static link" |
| default n |
| help |
| This option gives you the ability to force a static link of UML. |
| Normally, UML is linked as a shared binary. This is inconvenient for |
| use in a chroot jail. So, if you intend to run UML inside a chroot, |
| you probably want to say Y here. |
| Additionally, this option enables using higher memory spaces (up to |
| 2.75G) for UML. |
| |
| source "mm/Kconfig" |
| |
| config LD_SCRIPT_STATIC |
| bool |
| default y |
| depends on STATIC_LINK |
| |
| config LD_SCRIPT_DYN |
| bool |
| default y |
| depends on !LD_SCRIPT_STATIC |
| |
| source "fs/Kconfig.binfmt" |
| |
| config HOSTFS |
| tristate "Host filesystem" |
| help |
| While the User-Mode Linux port uses its own root file system for |
| booting and normal file access, this module lets the UML user |
| access files stored on the host. It does not require any |
| network connection between the Host and UML. An example use of |
| this might be: |
| |
| mount none /tmp/fromhost -t hostfs -o /tmp/umlshare |
| |
| where /tmp/fromhost is an empty directory inside UML and |
| /tmp/umlshare is a directory on the host with files the UML user |
| wishes to access. |
| |
| For more information, see |
| <http://user-mode-linux.sourceforge.net/hostfs.html>. |
| |
| If you'd like to be able to work with files stored on the host, |
| say Y or M here; otherwise say N. |
| |
| config HPPFS |
| tristate "HoneyPot ProcFS" |
| depends on PROC_FS |
| help |
| hppfs (HoneyPot ProcFS) is a filesystem which allows UML /proc |
| entries to be overridden, removed, or fabricated from the host. |
| Its purpose is to allow a UML to appear to be a physical machine |
| by removing or changing anything in /proc which gives away the |
| identity of a UML. |
| |
| See <http://user-mode-linux.sf.net/old/hppfs.html> for more information. |
| |
| You only need this if you are setting up a UML honeypot. Otherwise, |
| it is safe to say 'N' here. |
| |
| config MCONSOLE |
| bool "Management console" |
| default y |
| help |
| The user mode linux management console is a low-level interface to |
| the kernel, somewhat like the i386 SysRq interface. Since there is |
| a full-blown operating system running under every user mode linux |
| instance, there is much greater flexibility possible than with the |
| SysRq mechanism. |
| |
| If you answer 'Y' to this option, to use this feature, you need the |
| mconsole client (called uml_mconsole) which is present in CVS in |
| 2.4.5-9um and later (path /tools/mconsole), and is also in the |
| distribution RPM package in 2.4.6 and later. |
| |
| It is safe to say 'Y' here. |
| |
| config MAGIC_SYSRQ |
| bool "Magic SysRq key" |
| depends on MCONSOLE |
| help |
| If you say Y here, you will have some control over the system even |
| if the system crashes for example during kernel debugging (e.g., you |
| will be able to flush the buffer cache to disk, reboot the system |
| immediately or dump some status information). A key for each of the |
| possible requests is provided. |
| |
| This is the feature normally accomplished by pressing a key |
| while holding SysRq (Alt+PrintScreen). |
| |
| On UML, this is accomplished by sending a "sysrq" command with |
| mconsole, followed by the letter for the requested command. |
| |
| The keys are documented in <file:Documentation/sysrq.txt>. Don't say Y |
| unless you really know what this hack does. |
| |
| config SMP |
| bool "Symmetric multi-processing support" |
| default n |
| depends on BROKEN |
| help |
| This option enables UML SMP support. |
| It is NOT related to having a real SMP box. Not directly, at least. |
| |
| UML implements virtual SMP by allowing as many processes to run |
| simultaneously on the host as there are virtual processors configured. |
| |
| Obviously, if the host is a uniprocessor, those processes will |
| timeshare, but, inside UML, will appear to be running simultaneously. |
| If the host is a multiprocessor, then UML processes may run |
| simultaneously, depending on the host scheduler. |
| |
| This, however, is supported only in TT mode. So, if you use the SKAS |
| patch on your host, switching to TT mode and enabling SMP usually |
| gives you worse performances. |
| Also, since the support for SMP has been under-developed, there could |
| be some bugs being exposed by enabling SMP. |
| |
| If you don't know what to do, say N. |
| |
| config NR_CPUS |
| int "Maximum number of CPUs (2-32)" |
| range 2 32 |
| depends on SMP |
| default "32" |
| |
| config HIGHMEM |
| bool "Highmem support" |
| depends on !64BIT && BROKEN |
| default n |
| help |
| This was used to allow UML to run with big amounts of memory. |
| Currently it is unstable, so if unsure say N. |
| |
| To use big amounts of memory, it is recommended enable static |
| linking (i.e. CONFIG_STATIC_LINK) - this should allow the |
| guest to use up to 2.75G of memory. |
| |
| config KERNEL_STACK_ORDER |
| int "Kernel stack size order" |
| default 1 if 64BIT |
| range 1 10 if 64BIT |
| default 0 if !64BIT |
| help |
| This option determines the size of UML kernel stacks. They will |
| be 1 << order pages. The default is OK unless you're running Valgrind |
| on UML, in which case, set this to 3. |
| |
| config MMAPPER |
| tristate "iomem emulation driver" |
| help |
| This driver allows a host file to be used as emulated IO memory inside |
| UML. |
| |
| config NO_DMA |
| def_bool y |
