config USERMODE bool default y # XXX: does UM have a mmu/swap? config MMU bool default y mainmenu "Linux/Usermode Kernel Configuration" config ISA bool config SBUS bool config PCI bool config UID16 bool default y config RWSEM_GENERIC_SPINLOCK bool default y menu "UML-specific options" config MODE_TT bool "Tracing thread support" default y help This option controls whether tracing thread support is compiled into UML. Normally, this should be set to Y. If you intend to use only skas mode (and the host has the skas patch applied to it), then it is OK to say N here. config STATIC_LINK bool "Force a static link" default n depends on !MODE_TT help If CONFIG_MODE_TT is disabled, then this option gives you the ability to force a static link of UML. Normally, if only skas mode is built in to UML, it will be linked as a shared binary. This is inconvenient for use in a chroot jail. So, if you intend to run UML inside a chroot, and you disable CONFIG_MODE_TT, you probably want to say Y here. config MODE_SKAS bool "Separate Kernel Address Space support" default y help This option controls whether skas (separate kernel address space) support is compiled in. If you have applied the skas patch to the host, then you certainly want to say Y here (and consider saying N to CONFIG_MODE_TT). Otherwise, it is safe to say Y. Disabling this option will shrink the UML binary slightly. config NET bool "Networking support" 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 . If you'd like to be able to work with files stored on the host, say Y or M here; otherwise say N. config MCONSOLE bool "Management console" 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 config HOST_2G_2G bool "2G/2G host address space split" config UML_SMP bool "Symmetric multi-processing support" help This option enables UML SMP support. 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. CONFIG_SMP will be set to whatever this option is set to. It is safe to leave this unchanged. config SMP bool default UML_SMP config NR_CPUS int "Maximum number of CPUs (2-32)" range 2 32 depends on SMP default "32" config NEST_LEVEL int "Nesting level" default "0" help This is set to the number of layers of UMLs that this UML will be run in. Normally, this is zero, meaning that it will run directly on the host. Setting it to one will build a UML that can run inside a UML that is running on the host. Generally, if you intend this UML to run inside another UML, set CONFIG_NEST_LEVEL to one more than the host UML. Note that if the hosting UML has its CONFIG_KERNEL_HALF_GIGS set to greater than one, then the guest UML should have its CONFIG_NEST_LEVEL set to the host's CONFIG_NEST_LEVEL + CONFIG_KERNEL_HALF_GIGS. Only change this if you are running nested UMLs. config KERNEL_HALF_GIGS int "Kernel address space size (in .5G units)" default "1" help This determines the amount of address space that UML will allocate for its own, measured in half Gigabyte units. The default is 1. Change this only if you need to boot UML with an unusually large amount of physical memory. config HIGHMEM bool "Highmem support" config KERNEL_STACK_ORDER int "Kernel stack size order" default 2 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/base/Kconfig" source "arch/um/Kconfig_char" source "arch/um/Kconfig_block" config NETDEVICES bool default NET source "arch/um/Kconfig_net" source "net/Kconfig" source "fs/Kconfig" source "security/Kconfig" source "crypto/Kconfig" source "lib/Kconfig" menu "SCSI support" config SCSI tristate "SCSI support" # This gives us free_dma, which scsi.c wants. config GENERIC_ISA_DMA bool depends on SCSI default y source "arch/um/Kconfig_scsi" endmenu source "drivers/md/Kconfig" source "drivers/mtd/Kconfig" menu "Kernel hacking" config DEBUG_SLAB bool "Debug memory allocations" config DEBUG_SPINLOCK bool "Debug spinlocks usage" config DEBUG_INFO bool "Enable kernel debugging symbols" help When this is enabled, the User-Mode Linux binary will include debugging symbols. This enlarges the binary by a few megabytes, but aids in tracking down kernel problems in UML. It is required if you intend to do any kernel development. If you're truly short on disk space or don't expect to report any bugs back to the UML developers, say N, otherwise say Y. config FRAME_POINTER bool default y if DEBUG_INFO config PT_PROXY bool "Enable ptrace proxy" depends on XTERM_CHAN && DEBUG_INFO config GPROF bool "Enable gprof support" depends on DEBUG_INFO help This allows profiling of a User-Mode Linux kernel with the gprof utility. See for more details. If you're involved in UML kernel development and want to use gprof, say Y. If you're unsure, say N. config GCOV bool "Enable gcov support" depends on DEBUG_INFO help This option allows developers to retrieve coverage data from a UML session. See for more details. If you're involved in UML kernel development and want to use gcov, say Y. If you're unsure, say N. endmenu