536788fe2d
Calculate TASK_SIZE at run-time by figuring out the host's VMSPLIT - this is needed on i386 if UML is to run on hosts with varying VMSPLITs without recompilation. TASK_SIZE is now defined in terms of a variable, task_size. This gets rid of an include of pgtable.h from processor.h, which can cause include loops. On i386, task_size is calculated early in boot by probing the address space in a binary search to figure out where the boundary between usable and non-usable memory is. This tries to make sure that a page that is considered to be in userspace is, or can be made, read-write. I'm concerned about a system-global VDSO page in kernel memory being hit and considered to be a userspace page. On x86_64, task_size is just the old value of CONFIG_TOP_ADDR. A bunch of config variable are gone now. CONFIG_TOP_ADDR is directly replaced by TASK_SIZE. NEST_LEVEL is gone since the relocation of the stubs makes it irrelevant. All the HOST_VMSPLIT stuff is gone. All references to these in arch/um/Makefile are also gone. I noticed and fixed a missing extern in os.h when adding os_get_task_size. Note: This has been revised to fix the 32-bit UML on 64-bit host bug that Miklos ran into. Signed-off-by: Jeff Dike <jdike@linux.intel.com> Cc: Miklos Szeredi <miklos@szeredi.hu> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
268 lines
6.5 KiB
Plaintext
268 lines
6.5 KiB
Plaintext
config DEFCONFIG_LIST
|
|
string
|
|
option defconfig_list
|
|
default "arch/$ARCH/defconfig"
|
|
|
|
# UML uses the generic IRQ subsystem
|
|
config GENERIC_HARDIRQS
|
|
bool
|
|
default y
|
|
|
|
config UML
|
|
bool
|
|
default y
|
|
|
|
config MMU
|
|
bool
|
|
default y
|
|
|
|
config NO_IOMEM
|
|
def_bool y
|
|
|
|
mainmenu "Linux/Usermode Kernel Configuration"
|
|
|
|
config ISA
|
|
bool
|
|
|
|
config SBUS
|
|
bool
|
|
|
|
config PCI
|
|
bool
|
|
|
|
config PCMCIA
|
|
bool
|
|
|
|
# Yet to do!
|
|
config TRACE_IRQFLAGS_SUPPORT
|
|
bool
|
|
default n
|
|
|
|
config LOCKDEP_SUPPORT
|
|
bool
|
|
default y
|
|
|
|
config STACKTRACE_SUPPORT
|
|
bool
|
|
default n
|
|
|
|
config GENERIC_CALIBRATE_DELAY
|
|
bool
|
|
default y
|
|
|
|
config GENERIC_BUG
|
|
bool
|
|
default y
|
|
depends on BUG
|
|
|
|
config GENERIC_TIME
|
|
bool
|
|
default y
|
|
|
|
config GENERIC_CLOCKEVENTS
|
|
bool
|
|
default y
|
|
|
|
# Used in kernel/irq/manage.c and include/linux/irq.h
|
|
config IRQ_RELEASE_METHOD
|
|
bool
|
|
default y
|
|
|
|
config HZ
|
|
int
|
|
default 100
|
|
|
|
menu "UML-specific options"
|
|
|
|
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 "arch/um/Kconfig.arch"
|
|
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.
|
|
|
|
endmenu
|
|
|
|
source "init/Kconfig"
|
|
|
|
source "drivers/block/Kconfig"
|
|
|
|
source "arch/um/Kconfig.char"
|
|
|
|
source "drivers/base/Kconfig"
|
|
|
|
source "net/Kconfig"
|
|
|
|
source "arch/um/Kconfig.net"
|
|
|
|
source "drivers/net/Kconfig"
|
|
|
|
source "drivers/connector/Kconfig"
|
|
|
|
source "fs/Kconfig"
|
|
|
|
source "security/Kconfig"
|
|
|
|
source "crypto/Kconfig"
|
|
|
|
source "lib/Kconfig"
|
|
|
|
source "drivers/scsi/Kconfig"
|
|
|
|
source "drivers/md/Kconfig"
|
|
|
|
if BROKEN
|
|
source "drivers/mtd/Kconfig"
|
|
endif
|
|
|
|
#This is just to shut up some Kconfig warnings, so no prompt.
|
|
config INPUT
|
|
bool
|
|
default n
|
|
|
|
source "arch/um/Kconfig.debug"
|