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+# SPDX-License-Identifier: GPL-2.0
+
+menu "UML-specific options"
+
+config UML
+ bool
+ default y
+ select ARCH_HAS_CPU_FINALIZE_INIT
+ select ARCH_HAS_FORTIFY_SOURCE
+ select ARCH_HAS_GCOV_PROFILE_ALL
+ select ARCH_HAS_KCOV
+ select ARCH_HAS_STRNCPY_FROM_USER
+ select ARCH_HAS_STRNLEN_USER
+ select ARCH_NO_PREEMPT
+ select HAVE_ARCH_AUDITSYSCALL
+ select HAVE_ARCH_KASAN if X86_64
+ select HAVE_ARCH_KASAN_VMALLOC if HAVE_ARCH_KASAN
+ select HAVE_ARCH_SECCOMP_FILTER
+ select HAVE_ASM_MODVERSIONS
+ select HAVE_UID16
+ select HAVE_DEBUG_KMEMLEAK
+ select HAVE_DEBUG_BUGVERBOSE
+ select NO_DMA if !UML_DMA_EMULATION
+ select OF_EARLY_FLATTREE if OF
+ select GENERIC_IRQ_SHOW
+ select GENERIC_CPU_DEVICES
+ select HAVE_GCC_PLUGINS
+ select ARCH_SUPPORTS_LTO_CLANG
+ select ARCH_SUPPORTS_LTO_CLANG_THIN
+ select TRACE_IRQFLAGS_SUPPORT
+ select TTY # Needed for line.c
+ select HAVE_ARCH_VMAP_STACK
+ select HAVE_RUST if X86_64
+
+config MMU
+ bool
+ default y
+
+config UML_DMA_EMULATION
+ bool
+
+config NO_IOMEM
+ bool "disable IOMEM" if EXPERT
+ depends on !INDIRECT_IOMEM
+ default y
+
+config UML_IOMEM_EMULATION
+ bool
+ select INDIRECT_IOMEM
+ select GENERIC_PCI_IOMAP
+ select GENERIC_IOMAP
+ select NO_GENERIC_PCI_IOPORT_MAP
+
+config NO_IOPORT_MAP
+ def_bool y
+
+config ISA
+ bool
+
+config SBUS
+ bool
+
+config LOCKDEP_SUPPORT
+ bool
+ default y
+
+config STACKTRACE_SUPPORT
+ bool
+ default y
+ select STACKTRACE
+
+config GENERIC_CALIBRATE_DELAY
+ bool
+ default y
+
+config HZ
+ int
+ default 100
+
+config NR_CPUS
+ int
+ range 1 1
+ default 1
+
+config ARCH_HAS_CACHE_LINE_SIZE
+ def_bool y
+
+source "arch/$(HEADER_ARCH)/um/Kconfig"
+
+config MAY_HAVE_RUNTIME_DEPS
+ bool
+
+config STATIC_LINK
+ bool "Force a static link"
+ depends on CC_CAN_LINK_STATIC_NO_RUNTIME_DEPS || !MAY_HAVE_RUNTIME_DEPS
+ 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.
+
+ NOTE: This option is incompatible with some networking features which
+ depend on features that require being dynamically loaded (like NSS).
+
+config LD_SCRIPT_STATIC
+ bool
+ default y
+ depends on STATIC_LINK
+
+config LD_SCRIPT_DYN
+ bool
+ default y
+ depends on !LD_SCRIPT_STATIC
+
+config LD_SCRIPT_DYN_RPATH
+ bool "set rpath in the binary" if EXPERT
+ default y
+ depends on LD_SCRIPT_DYN
+ help
+ Add /lib (and /lib64 for 64-bit) to the linux binary's rpath
+ explicitly.
+
+ You may need to turn this off if compiling for nix systems
+ that have their libraries in random /nix directories and
+ might otherwise unexpected use libraries from /lib or /lib64
+ instead of the desired ones.
+
+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 MCONSOLE
+ bool "Management console"
+ depends on PROC_FS
+ 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/admin-guide/sysrq.rst>. Don't say Y
+ unless you really know what this hack does.
+
+config KERNEL_STACK_ORDER
+ int "Kernel stack size order"
+ default 2 if 64BIT
+ range 2 10 if 64BIT
+ default 1 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.
+ It is possible to reduce the stack to 1 for 64BIT and 0 for 32BIT on
+ older (pre-2017) CPUs. It is not recommended on newer CPUs due to the
+ increase in the size of the state which needs to be saved when handling
+ signals.
+
+config MMAPPER
+ tristate "iomem emulation driver"
+ help
+ This driver allows a host file to be used as emulated IO memory inside
+ UML.
+
+config PGTABLE_LEVELS
+ int
+ default 3 if 3_LEVEL_PGTABLES
+ default 2
+
+config UML_TIME_TRAVEL_SUPPORT
+ bool
+ prompt "Support time-travel mode (e.g. for test execution)"
+ # inf-cpu mode is incompatible with the benchmarking
+ depends on !RAID6_PQ_BENCHMARK
+ depends on !SMP
+ help
+ Enable this option to support time travel inside the UML instance.
+
+ After enabling this option, two modes are accessible at runtime
+ (selected by the kernel command line), see the kernel's command-
+ line help for more details.
+
+ It is safe to say Y, but you probably don't need this.
+
+config KASAN_SHADOW_OFFSET
+ hex
+ depends on KASAN
+ default 0x100000000000
+ help
+ This is the offset at which the ~16TB of shadow memory is
+ mapped and used by KASAN for memory debugging. This can be any
+ address that has at least KASAN_SHADOW_SIZE (total address space divided
+ by 8) amount of space so that the KASAN shadow memory does not conflict
+ with anything. The default is 0x100000000000, which works even if mem is
+ set to a large value. On low-memory systems, try 0x7fff8000, as it fits
+ into the immediate of most instructions, improving performance.
+
+endmenu
+
+source "arch/um/drivers/Kconfig"
+
+config ARCH_SUSPEND_POSSIBLE
+ def_bool y
+
+menu "Power management options"
+
+source "kernel/power/Kconfig"
+
+endmenu