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198 lines
5.1 KiB
198 lines
5.1 KiB
# SPDX-License-Identifier: GPL-2.0 |
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menu "UML-specific options" |
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config UML |
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bool |
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default y |
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select ARCH_HAS_KCOV |
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select ARCH_NO_PREEMPT |
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select HAVE_ARCH_AUDITSYSCALL |
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select HAVE_ARCH_SECCOMP_FILTER |
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select HAVE_ASM_MODVERSIONS |
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select HAVE_UID16 |
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select HAVE_FUTEX_CMPXCHG if FUTEX |
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select HAVE_DEBUG_KMEMLEAK |
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select HAVE_DEBUG_BUGVERBOSE |
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select NO_DMA |
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select GENERIC_IRQ_SHOW |
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select GENERIC_CPU_DEVICES |
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select HAVE_GCC_PLUGINS |
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select SET_FS |
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select TTY # Needed for line.c |
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config MMU |
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bool |
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default y |
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config NO_IOMEM |
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def_bool y |
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config ISA |
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bool |
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config SBUS |
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bool |
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config TRACE_IRQFLAGS_SUPPORT |
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bool |
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default y |
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config LOCKDEP_SUPPORT |
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bool |
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default y |
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config STACKTRACE_SUPPORT |
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bool |
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default y |
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select STACKTRACE |
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config GENERIC_CALIBRATE_DELAY |
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bool |
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default y |
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config HZ |
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int |
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default 100 |
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config NR_CPUS |
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int |
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range 1 1 |
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default 1 |
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source "arch/$(HEADER_ARCH)/um/Kconfig" |
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config MAY_HAVE_RUNTIME_DEPS |
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bool |
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config STATIC_LINK |
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bool "Force a static link" |
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depends on CC_CAN_LINK_STATIC_NO_RUNTIME_DEPS || !MAY_HAVE_RUNTIME_DEPS |
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help |
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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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NOTE: This option is incompatible with some networking features which |
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depend on features that require being dynamically loaded (like NSS). |
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config LD_SCRIPT_STATIC |
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bool |
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default y |
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depends on STATIC_LINK |
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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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select MODULE_REL_CRCS if MODVERSIONS |
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config HOSTFS |
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tristate "Host filesystem" |
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help |
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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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mount none /tmp/fromhost -t hostfs -o /tmp/umlshare |
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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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For more information, see |
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<http://user-mode-linux.sourceforge.net/hostfs.html>. |
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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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config MCONSOLE |
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bool "Management console" |
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depends on PROC_FS |
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default y |
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help |
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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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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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It is safe to say 'Y' here. |
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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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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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This is the feature normally accomplished by pressing a key |
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while holding SysRq (Alt+PrintScreen). |
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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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The keys are documented in <file:Documentation/admin-guide/sysrq.rst>. Don't say Y |
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unless you really know what this hack does. |
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config KERNEL_STACK_ORDER |
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int "Kernel stack size order" |
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default 2 if 64BIT |
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range 2 10 if 64BIT |
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default 1 if !64BIT |
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help |
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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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It is possible to reduce the stack to 1 for 64BIT and 0 for 32BIT on |
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older (pre-2017) CPUs. It is not recommended on newer CPUs due to the |
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increase in the size of the state which needs to be saved when handling |
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signals. |
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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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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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config UML_TIME_TRAVEL_SUPPORT |
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bool |
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prompt "Support time-travel mode (e.g. for test execution)" |
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# inf-cpu mode is incompatible with the benchmarking |
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depends on !RAID6_PQ_BENCHMARK |
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depends on !SMP |
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help |
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Enable this option to support time travel inside the UML instance. |
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After enabling this option, two modes are accessible at runtime |
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(selected by the kernel command line), see the kernel's command- |
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line help for more details. |
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It is safe to say Y, but you probably don't need this. |
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endmenu |
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source "arch/um/drivers/Kconfig" |
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config ARCH_SUSPEND_POSSIBLE |
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def_bool y |
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source "kernel/power/Kconfig"
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