179b05c1fSChristoph Hellwig# SPDX-License-Identifier: GPL-2.0 279b05c1fSChristoph Hellwig 3f163977dSChristoph Hellwigmenu "UML-specific options" 4f163977dSChristoph Hellwig 5f163977dSChristoph Hellwigconfig UML 6f163977dSChristoph Hellwig bool 7f163977dSChristoph Hellwig default y 8f163977dSChristoph Hellwig select ARCH_HAS_KCOV 987a4c375SChristoph Hellwig select ARCH_NO_PREEMPT 10f163977dSChristoph Hellwig select HAVE_ARCH_AUDITSYSCALL 11f163977dSChristoph Hellwig select HAVE_ARCH_SECCOMP_FILTER 122ff2b7ecSMasahiro Yamada select HAVE_ASM_MODVERSIONS 13f163977dSChristoph Hellwig select HAVE_UID16 14f163977dSChristoph Hellwig select HAVE_FUTEX_CMPXCHG if FUTEX 15f163977dSChristoph Hellwig select HAVE_DEBUG_KMEMLEAK 160d76433cSHernán Gonzalez select HAVE_DEBUG_BUGVERBOSE 17846f9e1fSChristoph Hellwig select NO_DMA 18f163977dSChristoph Hellwig select GENERIC_IRQ_SHOW 19f163977dSChristoph Hellwig select GENERIC_CPU_DEVICES 20f163977dSChristoph Hellwig select GENERIC_CLOCKEVENTS 21f163977dSChristoph Hellwig select HAVE_GCC_PLUGINS 225e6e9852SChristoph Hellwig select SET_FS 23f163977dSChristoph Hellwig select TTY # Needed for line.c 24f163977dSChristoph Hellwig 25f163977dSChristoph Hellwigconfig MMU 26f163977dSChristoph Hellwig bool 27f163977dSChristoph Hellwig default y 28f163977dSChristoph Hellwig 29f163977dSChristoph Hellwigconfig NO_IOMEM 30f163977dSChristoph Hellwig def_bool y 31f163977dSChristoph Hellwig 32f163977dSChristoph Hellwigconfig ISA 33f163977dSChristoph Hellwig bool 34f163977dSChristoph Hellwig 35f163977dSChristoph Hellwigconfig SBUS 36f163977dSChristoph Hellwig bool 37f163977dSChristoph Hellwig 38f163977dSChristoph Hellwigconfig TRACE_IRQFLAGS_SUPPORT 39f163977dSChristoph Hellwig bool 40f163977dSChristoph Hellwig default y 41f163977dSChristoph Hellwig 42f163977dSChristoph Hellwigconfig LOCKDEP_SUPPORT 43f163977dSChristoph Hellwig bool 44f163977dSChristoph Hellwig default y 45f163977dSChristoph Hellwig 46f163977dSChristoph Hellwigconfig STACKTRACE_SUPPORT 47f163977dSChristoph Hellwig bool 48f163977dSChristoph Hellwig default y 49f163977dSChristoph Hellwig select STACKTRACE 50f163977dSChristoph Hellwig 51f163977dSChristoph Hellwigconfig GENERIC_CALIBRATE_DELAY 52f163977dSChristoph Hellwig bool 53f163977dSChristoph Hellwig default y 54f163977dSChristoph Hellwig 55f163977dSChristoph Hellwigconfig HZ 56f163977dSChristoph Hellwig int 57f163977dSChristoph Hellwig default 100 58f163977dSChristoph Hellwig 59f163977dSChristoph Hellwigconfig NR_CPUS 60f163977dSChristoph Hellwig int 61f163977dSChristoph Hellwig range 1 1 62f163977dSChristoph Hellwig default 1 63f163977dSChristoph Hellwig 6479b05c1fSChristoph Hellwigsource "arch/$(HEADER_ARCH)/um/Kconfig" 65f163977dSChristoph Hellwig 66730586ffSIgnat Korchaginconfig MAY_HAVE_RUNTIME_DEPS 6733631793SBrendan Higgins bool 6833631793SBrendan Higgins 69f163977dSChristoph Hellwigconfig STATIC_LINK 70f163977dSChristoph Hellwig bool "Force a static link" 71730586ffSIgnat Korchagin depends on CC_CAN_LINK_STATIC_NO_RUNTIME_DEPS || !MAY_HAVE_RUNTIME_DEPS 72f163977dSChristoph Hellwig help 73f163977dSChristoph Hellwig This option gives you the ability to force a static link of UML. 74f163977dSChristoph Hellwig Normally, UML is linked as a shared binary. This is inconvenient for 75f163977dSChristoph Hellwig use in a chroot jail. So, if you intend to run UML inside a chroot, 76f163977dSChristoph Hellwig you probably want to say Y here. 77f163977dSChristoph Hellwig Additionally, this option enables using higher memory spaces (up to 78f163977dSChristoph Hellwig 2.75G) for UML. 79f163977dSChristoph Hellwig 8033631793SBrendan Higgins NOTE: This option is incompatible with some networking features which 8133631793SBrendan Higgins depend on features that require being dynamically loaded (like NSS). 8233631793SBrendan Higgins 83f163977dSChristoph Hellwigconfig LD_SCRIPT_STATIC 84f163977dSChristoph Hellwig bool 85f163977dSChristoph Hellwig default y 86f163977dSChristoph Hellwig depends on STATIC_LINK 87f163977dSChristoph Hellwig 88f163977dSChristoph Hellwigconfig LD_SCRIPT_DYN 89f163977dSChristoph Hellwig bool 90f163977dSChristoph Hellwig default y 91f163977dSChristoph Hellwig depends on !LD_SCRIPT_STATIC 92f163977dSChristoph Hellwig select MODULE_REL_CRCS if MODVERSIONS 93f163977dSChristoph Hellwig 94f163977dSChristoph Hellwigconfig HOSTFS 95f163977dSChristoph Hellwig tristate "Host filesystem" 96f163977dSChristoph Hellwig help 97f163977dSChristoph Hellwig While the User-Mode Linux port uses its own root file system for 98f163977dSChristoph Hellwig booting and normal file access, this module lets the UML user 99f163977dSChristoph Hellwig access files stored on the host. It does not require any 100f163977dSChristoph Hellwig network connection between the Host and UML. An example use of 101f163977dSChristoph Hellwig this might be: 102f163977dSChristoph Hellwig 103f163977dSChristoph Hellwig mount none /tmp/fromhost -t hostfs -o /tmp/umlshare 104f163977dSChristoph Hellwig 105f163977dSChristoph Hellwig where /tmp/fromhost is an empty directory inside UML and 106f163977dSChristoph Hellwig /tmp/umlshare is a directory on the host with files the UML user 107f163977dSChristoph Hellwig wishes to access. 108f163977dSChristoph Hellwig 109f163977dSChristoph Hellwig For more information, see 110f163977dSChristoph Hellwig <http://user-mode-linux.sourceforge.net/hostfs.html>. 111f163977dSChristoph Hellwig 112f163977dSChristoph Hellwig If you'd like to be able to work with files stored on the host, 113f163977dSChristoph Hellwig say Y or M here; otherwise say N. 114f163977dSChristoph Hellwig 115f163977dSChristoph Hellwigconfig MCONSOLE 116f163977dSChristoph Hellwig bool "Management console" 117f163977dSChristoph Hellwig depends on PROC_FS 118f163977dSChristoph Hellwig default y 119f163977dSChristoph Hellwig help 120f163977dSChristoph Hellwig The user mode linux management console is a low-level interface to 121f163977dSChristoph Hellwig the kernel, somewhat like the i386 SysRq interface. Since there is 122f163977dSChristoph Hellwig a full-blown operating system running under every user mode linux 123f163977dSChristoph Hellwig instance, there is much greater flexibility possible than with the 124f163977dSChristoph Hellwig SysRq mechanism. 125f163977dSChristoph Hellwig 126f163977dSChristoph Hellwig If you answer 'Y' to this option, to use this feature, you need the 127f163977dSChristoph Hellwig mconsole client (called uml_mconsole) which is present in CVS in 128f163977dSChristoph Hellwig 2.4.5-9um and later (path /tools/mconsole), and is also in the 129f163977dSChristoph Hellwig distribution RPM package in 2.4.6 and later. 130f163977dSChristoph Hellwig 131f163977dSChristoph Hellwig It is safe to say 'Y' here. 132f163977dSChristoph Hellwig 133f163977dSChristoph Hellwigconfig MAGIC_SYSRQ 134f163977dSChristoph Hellwig bool "Magic SysRq key" 135f163977dSChristoph Hellwig depends on MCONSOLE 136f163977dSChristoph Hellwig help 137f163977dSChristoph Hellwig If you say Y here, you will have some control over the system even 138f163977dSChristoph Hellwig if the system crashes for example during kernel debugging (e.g., you 139f163977dSChristoph Hellwig will be able to flush the buffer cache to disk, reboot the system 140f163977dSChristoph Hellwig immediately or dump some status information). A key for each of the 141f163977dSChristoph Hellwig possible requests is provided. 142f163977dSChristoph Hellwig 143f163977dSChristoph Hellwig This is the feature normally accomplished by pressing a key 144f163977dSChristoph Hellwig while holding SysRq (Alt+PrintScreen). 145f163977dSChristoph Hellwig 146f163977dSChristoph Hellwig On UML, this is accomplished by sending a "sysrq" command with 147f163977dSChristoph Hellwig mconsole, followed by the letter for the requested command. 148f163977dSChristoph Hellwig 149f163977dSChristoph Hellwig The keys are documented in <file:Documentation/admin-guide/sysrq.rst>. Don't say Y 150f163977dSChristoph Hellwig unless you really know what this hack does. 151f163977dSChristoph Hellwig 152f163977dSChristoph Hellwigconfig KERNEL_STACK_ORDER 153f163977dSChristoph Hellwig int "Kernel stack size order" 1545c2ffce1SAnton Ivanov default 2 if 64BIT 1555c2ffce1SAnton Ivanov range 2 10 if 64BIT 1565c2ffce1SAnton Ivanov default 1 if !64BIT 157f163977dSChristoph Hellwig help 158f163977dSChristoph Hellwig This option determines the size of UML kernel stacks. They will 159f163977dSChristoph Hellwig be 1 << order pages. The default is OK unless you're running Valgrind 160f163977dSChristoph Hellwig on UML, in which case, set this to 3. 1615c2ffce1SAnton Ivanov It is possible to reduce the stack to 1 for 64BIT and 0 for 32BIT on 1625c2ffce1SAnton Ivanov older (pre-2017) CPUs. It is not recommended on newer CPUs due to the 1635c2ffce1SAnton Ivanov increase in the size of the state which needs to be saved when handling 1645c2ffce1SAnton Ivanov signals. 165f163977dSChristoph Hellwig 166f163977dSChristoph Hellwigconfig MMAPPER 167f163977dSChristoph Hellwig tristate "iomem emulation driver" 168f163977dSChristoph Hellwig help 169f163977dSChristoph Hellwig This driver allows a host file to be used as emulated IO memory inside 170f163977dSChristoph Hellwig UML. 171f163977dSChristoph Hellwig 172f163977dSChristoph Hellwigconfig PGTABLE_LEVELS 173f163977dSChristoph Hellwig int 174f163977dSChristoph Hellwig default 3 if 3_LEVEL_PGTABLES 175f163977dSChristoph Hellwig default 2 176f163977dSChristoph Hellwig 17706503870SJohannes Bergconfig UML_TIME_TRAVEL_SUPPORT 17806503870SJohannes Berg bool 17906503870SJohannes Berg prompt "Support time-travel mode (e.g. for test execution)" 180d65197adSJohannes Berg # inf-cpu mode is incompatible with the benchmarking 181d65197adSJohannes Berg depends on !RAID6_PQ_BENCHMARK 1824b786e24SJohannes Berg depends on !SMP 18306503870SJohannes Berg help 18406503870SJohannes Berg Enable this option to support time travel inside the UML instance. 18506503870SJohannes Berg 18606503870SJohannes Berg After enabling this option, two modes are accessible at runtime 18706503870SJohannes Berg (selected by the kernel command line), see the kernel's command- 18806503870SJohannes Berg line help for more details. 18906503870SJohannes Berg 19006503870SJohannes Berg It is safe to say Y, but you probably don't need this. 19106503870SJohannes Berg 192f163977dSChristoph Hellwigendmenu 193f163977dSChristoph Hellwig 1949bea1801SChristoph Hellwigsource "arch/um/drivers/Kconfig" 195*92dcd3d3SJohannes Berg 196*92dcd3d3SJohannes Bergconfig ARCH_SUSPEND_POSSIBLE 197*92dcd3d3SJohannes Berg def_bool y 198*92dcd3d3SJohannes Berg 199*92dcd3d3SJohannes Bergsource "kernel/power/Kconfig" 200