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Diffstat (limited to '')
| -rw-r--r-- | arch/um/Kconfig | 200 | ||||
| -rw-r--r-- | arch/um/Kconfig.debug | 38 |
2 files changed, 238 insertions, 0 deletions
diff --git a/arch/um/Kconfig b/arch/um/Kconfig new file mode 100644 index 000000000..eb1c6880b --- /dev/null +++ b/arch/um/Kconfig @@ -0,0 +1,200 @@ +# SPDX-License-Identifier: GPL-2.0 + +menu "UML-specific options" + +config UML + bool + default y + select ARCH_HAS_CPU_FINALIZE_INIT + select ARCH_HAS_KCOV + select ARCH_NO_PREEMPT + select HAVE_ARCH_AUDITSYSCALL + select HAVE_ARCH_SECCOMP_FILTER + select HAVE_ASM_MODVERSIONS + select HAVE_UID16 + select HAVE_FUTEX_CMPXCHG if FUTEX + select HAVE_DEBUG_KMEMLEAK + select HAVE_DEBUG_BUGVERBOSE + select NO_DMA + select GENERIC_IRQ_SHOW + select GENERIC_CPU_DEVICES + select GENERIC_CLOCKEVENTS + select HAVE_GCC_PLUGINS + select SET_FS + select TTY # Needed for line.c + +config MMU + bool + default y + +config NO_IOMEM + def_bool y + +config ISA + bool + +config SBUS + bool + +config TRACE_IRQFLAGS_SUPPORT + bool + default y + +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 + +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 + select MODULE_REL_CRCS if MODVERSIONS + +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. + +endmenu + +source "arch/um/drivers/Kconfig" + +config ARCH_SUSPEND_POSSIBLE + def_bool y + +source "kernel/power/Kconfig" diff --git a/arch/um/Kconfig.debug b/arch/um/Kconfig.debug new file mode 100644 index 000000000..1dfb2959c --- /dev/null +++ b/arch/um/Kconfig.debug @@ -0,0 +1,38 @@ +# SPDX-License-Identifier: GPL-2.0 + +config GPROF + bool "Enable gprof support" + depends on DEBUG_INFO && FRAME_POINTER + help + This allows profiling of a User-Mode Linux kernel with the gprof + utility. + + See <http://user-mode-linux.sourceforge.net/old/gprof.html> 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 + depends on !KCOV + depends on !MODULES + help + This option allows developers to retrieve coverage data from a UML + session. + + See <http://user-mode-linux.sourceforge.net/old/gprof.html> for more + details. + + If you're involved in UML kernel development and want to use gcov, + say Y. If you're unsure, say N. + +config EARLY_PRINTK + bool "Early printk" + default y + help + Write kernel log output directly to stdout. + + This is useful for kernel debugging when your machine crashes very + early before the console code is initialized. |