2005-04-16 16:20:36 -06:00
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config STATIC_LINK
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bool "Force a static link"
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default n
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help
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2007-10-16 02:26:54 -06:00
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This option gives you the ability to force a static link of UML.
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Normally, UML is linked as a shared binary. This is inconvenient for
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use in a chroot jail. So, if you intend to run UML inside a chroot,
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you probably want to say Y here.
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Additionally, this option enables using higher memory spaces (up to
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2.75G) for UML.
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2005-04-16 16:20:36 -06:00
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2005-06-23 01:07:43 -06:00
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source "mm/Kconfig"
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2005-04-16 16:20:36 -06:00
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config LD_SCRIPT_STATIC
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bool
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default y
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uml: throw out CONFIG_MODE_TT
This patchset throws out tt mode, which has been non-functional for a while.
This is done in phases, interspersed with code cleanups on the affected files.
The removal is done as follows:
remove all code, config options, and files which depend on
CONFIG_MODE_TT
get rid of the CHOOSE_MODE macro, which decided whether to
call tt-mode or skas-mode code, and replace invocations with their
skas portions
replace all now-trivial procedures with their skas equivalents
There are now a bunch of now-redundant pieces of data structures, including
mode-specific pieces of the thread structure, pt_regs, and mm_context. These
are all replaced with their skas-specific contents.
As part of the ongoing style compliance project, I made a style pass over all
files that were changed. There are three such patches, one for each phase,
covering the files affected by that phase but no later ones.
I noticed that we weren't freeing the LDT state associated with a process when
it exited, so that's fixed in one of the later patches.
The last patch is a tidying patch which I've had for a while, but which caused
inexplicable crashes under tt mode. Since that is no longer a problem, this
can now go in.
This patch:
Start getting rid of tt mode support.
This patch throws out CONFIG_MODE_TT and all config options, code, and files
which depend on it.
CONFIG_MODE_SKAS is gone and everything that depends on it is included
unconditionally.
The few changed lines are in re-written Kconfig help, lines which needed
something skas-related removed from them, and a few more which weren't
strictly deletions.
Signed-off-by: Jeff Dike <jdike@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-16 02:26:50 -06:00
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depends on STATIC_LINK
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2005-04-16 16:20:36 -06:00
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config LD_SCRIPT_DYN
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bool
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default y
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depends on !LD_SCRIPT_STATIC
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source "fs/Kconfig.binfmt"
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config HOSTFS
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tristate "Host filesystem"
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help
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2007-10-16 02:26:54 -06:00
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While the User-Mode Linux port uses its own root file system for
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booting and normal file access, this module lets the UML user
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access files stored on the host. It does not require any
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network connection between the Host and UML. An example use of
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this might be:
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2005-04-16 16:20:36 -06:00
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2007-10-16 02:26:54 -06:00
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mount none /tmp/fromhost -t hostfs -o /tmp/umlshare
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2005-04-16 16:20:36 -06:00
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2007-10-16 02:26:54 -06:00
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where /tmp/fromhost is an empty directory inside UML and
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/tmp/umlshare is a directory on the host with files the UML user
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wishes to access.
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2005-04-16 16:20:36 -06:00
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2007-10-16 02:26:54 -06:00
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For more information, see
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<http://user-mode-linux.sourceforge.net/hostfs.html>.
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2005-04-16 16:20:36 -06:00
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2007-10-16 02:26:54 -06:00
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If you'd like to be able to work with files stored on the host,
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say Y or M here; otherwise say N.
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2005-04-16 16:20:36 -06:00
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config MCONSOLE
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bool "Management console"
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2015-05-31 15:27:26 -06:00
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depends on PROC_FS
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2005-04-16 16:20:36 -06:00
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default y
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help
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2007-10-16 02:26:54 -06:00
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The user mode linux management console is a low-level interface to
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the kernel, somewhat like the i386 SysRq interface. Since there is
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a full-blown operating system running under every user mode linux
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instance, there is much greater flexibility possible than with the
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SysRq mechanism.
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2005-04-16 16:20:36 -06:00
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2007-10-16 02:26:54 -06:00
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If you answer 'Y' to this option, to use this feature, you need the
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mconsole client (called uml_mconsole) which is present in CVS in
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2.4.5-9um and later (path /tools/mconsole), and is also in the
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distribution RPM package in 2.4.6 and later.
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2005-04-16 16:20:36 -06:00
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2007-10-16 02:26:54 -06:00
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It is safe to say 'Y' here.
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2005-04-16 16:20:36 -06:00
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config MAGIC_SYSRQ
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bool "Magic SysRq key"
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depends on MCONSOLE
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2007-10-16 02:26:54 -06:00
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help
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If you say Y here, you will have some control over the system even
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if the system crashes for example during kernel debugging (e.g., you
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will be able to flush the buffer cache to disk, reboot the system
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immediately or dump some status information). A key for each of the
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possible requests is provided.
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2005-04-16 16:20:36 -06:00
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2007-10-16 02:26:54 -06:00
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This is the feature normally accomplished by pressing a key
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while holding SysRq (Alt+PrintScreen).
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2005-04-16 16:20:36 -06:00
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2007-10-16 02:26:54 -06:00
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On UML, this is accomplished by sending a "sysrq" command with
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mconsole, followed by the letter for the requested command.
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2005-04-16 16:20:36 -06:00
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2007-10-16 02:26:54 -06:00
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The keys are documented in <file:Documentation/sysrq.txt>. Don't say Y
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unless you really know what this hack does.
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2005-04-16 16:20:36 -06:00
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config KERNEL_STACK_ORDER
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int "Kernel stack size order"
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2007-05-10 23:22:35 -06:00
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default 1 if 64BIT
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2007-06-08 14:46:49 -06:00
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range 1 10 if 64BIT
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2007-05-10 23:22:35 -06:00
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default 0 if !64BIT
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2005-04-16 16:20:36 -06:00
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help
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2007-10-16 02:26:54 -06:00
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This option determines the size of UML kernel stacks. They will
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be 1 << order pages. The default is OK unless you're running Valgrind
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on UML, in which case, set this to 3.
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2010-10-26 15:22:18 -06:00
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2011-08-18 13:13:00 -06:00
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config MMAPPER
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tristate "iomem emulation driver"
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help
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This driver allows a host file to be used as emulated IO memory inside
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UML.
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2010-10-26 15:22:18 -06:00
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config NO_DMA
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def_bool y
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2015-04-14 16:46:11 -06:00
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config PGTABLE_LEVELS
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int
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default 3 if 3_LEVEL_PGTABLES
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default 2
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2015-12-29 13:35:47 -07:00
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config SECCOMP
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def_bool y
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prompt "Enable seccomp to safely compute untrusted bytecode"
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---help---
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This kernel feature is useful for number crunching applications
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that may need to compute untrusted bytecode during their
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execution. By using pipes or other transports made available to
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the process as file descriptors supporting the read/write
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syscalls, it's possible to isolate those applications in
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their own address space using seccomp. Once seccomp is
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enabled via prctl(PR_SET_SECCOMP), it cannot be disabled
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and the task is only allowed to execute a few safe syscalls
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defined by each seccomp mode.
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If unsure, say Y.
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