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Diffstat (limited to 'arch/um/Kconfig.um')
| -rw-r--r-- | arch/um/Kconfig.um | 149 |
1 files changed, 149 insertions, 0 deletions
diff --git a/arch/um/Kconfig.um b/arch/um/Kconfig.um new file mode 100644 index 000000000000..ec2b8da1aba4 --- /dev/null +++ b/arch/um/Kconfig.um @@ -0,0 +1,149 @@ +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" +source "kernel/time/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 (EXPERIMENTAL)" + depends on EXPERIMENTAL + 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 (EXPERIMENTAL)" + 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 (EXPERIMENTAL)" + depends on !64BIT && EXPERIMENTAL + 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. |