1# UML uses the generic IRQ sugsystem 2config GENERIC_HARDIRQS 3 bool 4 default y 5 6config UML 7 bool 8 default y 9 10config MMU 11 bool 12 default y 13 14mainmenu "Linux/Usermode Kernel Configuration" 15 16config ISA 17 bool 18 19config SBUS 20 bool 21 22config PCI 23 bool 24 25config UID16 26 bool 27 default y 28 29config GENERIC_CALIBRATE_DELAY 30 bool 31 default y 32 33# Used in kernel/irq/manage.c and include/linux/irq.h 34config IRQ_RELEASE_METHOD 35 bool 36 default y 37 38menu "UML-specific options" 39 40config MODE_TT 41 bool "Tracing thread support" 42 default y 43 help 44 This option controls whether tracing thread support is compiled 45 into UML. Normally, this should be set to Y. If you intend to 46 use only skas mode (and the host has the skas patch applied to it), 47 then it is OK to say N here. 48 49config STATIC_LINK 50 bool "Force a static link" 51 default n 52 depends on !MODE_TT 53 help 54 If CONFIG_MODE_TT is disabled, then this option gives you the ability 55 to force a static link of UML. Normally, if only skas mode is built 56 in to UML, it will be linked as a shared binary. This is inconvenient 57 for use in a chroot jail. So, if you intend to run UML inside a 58 chroot, and you disable CONFIG_MODE_TT, you probably want to say Y 59 here. 60 61config HOST_2G_2G 62 bool "2G/2G host address space split" 63 default n 64 depends on MODE_TT 65 help 66 This is needed when the host on which you run has a 2G/2G memory 67 split, instead of the customary 3G/1G. 68 69 Note that to enable such a host 70 configuration, which makes sense only in some cases, you need special 71 host patches. 72 73 So, if you do not know what to do here, say 'N'. 74 75config KERNEL_HALF_GIGS 76 int "Kernel address space size (in .5G units)" 77 default "1" 78 depends on MODE_TT 79 help 80 This determines the amount of address space that UML will allocate for 81 its own, measured in half Gigabyte units. The default is 1. 82 Change this only if you need to boot UML with an unusually large amount 83 of physical memory. 84 85config MODE_SKAS 86 bool "Separate Kernel Address Space support" 87 default y 88 help 89 This option controls whether skas (separate kernel address space) 90 support is compiled in. If you have applied the skas patch to the 91 host, then you certainly want to say Y here (and consider saying N 92 to CONFIG_MODE_TT). Otherwise, it is safe to say Y. Disabling this 93 option will shrink the UML binary slightly. 94 95source "arch/um/Kconfig.arch" 96source "mm/Kconfig" 97 98config LD_SCRIPT_STATIC 99 bool 100 default y 101 depends on MODE_TT || STATIC_LINK 102 103config LD_SCRIPT_DYN 104 bool 105 default y 106 depends on !LD_SCRIPT_STATIC 107 108config NET 109 bool "Networking support" 110 help 111 Unless you really know what you are doing, you should say Y here. 112 The reason is that some programs need kernel networking support even 113 when running on a stand-alone machine that isn't connected to any 114 other computer. If you are upgrading from an older kernel, you 115 should consider updating your networking tools too because changes 116 in the kernel and the tools often go hand in hand. The tools are 117 contained in the package net-tools, the location and version number 118 of which are given in <file:Documentation/Changes>. 119 120 For a general introduction to Linux networking, it is highly 121 recommended to read the NET-HOWTO, available from 122 <http://www.tldp.org/docs.html#howto>. 123 124 125source "fs/Kconfig.binfmt" 126 127config HOSTFS 128 tristate "Host filesystem" 129 help 130 While the User-Mode Linux port uses its own root file system for 131 booting and normal file access, this module lets the UML user 132 access files stored on the host. It does not require any 133 network connection between the Host and UML. An example use of 134 this might be: 135 136 mount none /tmp/fromhost -t hostfs -o /tmp/umlshare 137 138 where /tmp/fromhost is an empty directory inside UML and 139 /tmp/umlshare is a directory on the host with files the UML user 140 wishes to access. 141 142 For more information, see 143 <http://user-mode-linux.sourceforge.net/hostfs.html>. 144 145 If you'd like to be able to work with files stored on the host, 146 say Y or M here; otherwise say N. 147 148config HPPFS 149 tristate "HoneyPot ProcFS (EXPERIMENTAL)" 150 help 151 hppfs (HoneyPot ProcFS) is a filesystem which allows UML /proc 152 entries to be overridden, removed, or fabricated from the host. 153 Its purpose is to allow a UML to appear to be a physical machine 154 by removing or changing anything in /proc which gives away the 155 identity of a UML. 156 157 See <http://user-mode-linux.sf.net/hppfs.html> for more information. 158 159 You only need this if you are setting up a UML honeypot. Otherwise, 160 it is safe to say 'N' here. 161 162 If you are actively using it, please report any problems, since it's 163 getting fixed. In this moment, it is experimental on 2.6 (it works on 164 2.4). 165 166config MCONSOLE 167 bool "Management console" 168 default y 169 help 170 The user mode linux management console is a low-level interface to 171 the kernel, somewhat like the i386 SysRq interface. Since there is 172 a full-blown operating system running under every user mode linux 173 instance, there is much greater flexibility possible than with the 174 SysRq mechanism. 175 176 If you answer 'Y' to this option, to use this feature, you need the 177 mconsole client (called uml_mconsole) which is present in CVS in 178 2.4.5-9um and later (path /tools/mconsole), and is also in the 179 distribution RPM package in 2.4.6 and later. 180 181 It is safe to say 'Y' here. 182 183config MAGIC_SYSRQ 184 bool "Magic SysRq key" 185 depends on MCONSOLE 186 ---help--- 187 If you say Y here, you will have some control over the system even 188 if the system crashes for example during kernel debugging (e.g., you 189 will be able to flush the buffer cache to disk, reboot the system 190 immediately or dump some status information). A key for each of the 191 possible requests is provided. 192 193 This is the feature normally accomplished by pressing a key 194 while holding SysRq (Alt+PrintScreen). 195 196 On UML, this is accomplished by sending a "sysrq" command with 197 mconsole, followed by the letter for the requested command. 198 199 The keys are documented in <file:Documentation/sysrq.txt>. Don't say Y 200 unless you really know what this hack does. 201 202config SMP 203 bool "Symmetric multi-processing support (EXPERIMENTAL)" 204 default n 205 #SMP_BROKEN is for x86_64. 206 depends on MODE_TT && EXPERIMENTAL && (!SMP_BROKEN || (BROKEN && SMP_BROKEN)) 207 help 208 This option enables UML SMP support. 209 It is NOT related to having a real SMP box. Not directly, at least. 210 211 UML implements virtual SMP by allowing as many processes to run 212 simultaneously on the host as there are virtual processors configured. 213 214 Obviously, if the host is a uniprocessor, those processes will 215 timeshare, but, inside UML, will appear to be running simultaneously. 216 If the host is a multiprocessor, then UML processes may run 217 simultaneously, depending on the host scheduler. 218 219 This, however, is supported only in TT mode. So, if you use the SKAS 220 patch on your host, switching to TT mode and enabling SMP usually gives 221 you worse performances. 222 Also, since the support for SMP has been under-developed, there could 223 be some bugs being exposed by enabling SMP. 224 225 If you don't know what to do, say N. 226 227config NR_CPUS 228 int "Maximum number of CPUs (2-32)" 229 range 2 32 230 depends on SMP 231 default "32" 232 233config NEST_LEVEL 234 int "Nesting level" 235 default "0" 236 help 237 This is set to the number of layers of UMLs that this UML will be run 238 in. Normally, this is zero, meaning that it will run directly on the 239 host. Setting it to one will build a UML that can run inside a UML 240 that is running on the host. Generally, if you intend this UML to run 241 inside another UML, set CONFIG_NEST_LEVEL to one more than the host 242 UML. 243 244 Note that if the hosting UML has its CONFIG_KERNEL_HALF_GIGS set to 245 greater than one, then the guest UML should have its CONFIG_NEST_LEVEL 246 set to the host's CONFIG_NEST_LEVEL + CONFIG_KERNEL_HALF_GIGS. 247 Only change this if you are running nested UMLs. 248 249config HIGHMEM 250 bool "Highmem support" 251 depends on !64BIT 252 253config KERNEL_STACK_ORDER 254 int "Kernel stack size order" 255 default 2 256 help 257 This option determines the size of UML kernel stacks. They will 258 be 1 << order pages. The default is OK unless you're running Valgrind 259 on UML, in which case, set this to 3. 260 261config UML_REAL_TIME_CLOCK 262 bool "Real-time Clock" 263 default y 264 help 265 This option makes UML time deltas match wall clock deltas. This should 266 normally be enabled. The exception would be if you are debugging with 267 UML and spend long times with UML stopped at a breakpoint. In this 268 case, when UML is restarted, it will call the timer enough times to make 269 up for the time spent at the breakpoint. This could result in a 270 noticable lag. If this is a problem, then disable this option. 271 272endmenu 273 274source "init/Kconfig" 275 276source "net/Kconfig" 277 278source "drivers/base/Kconfig" 279 280source "arch/um/Kconfig.char" 281 282source "drivers/block/Kconfig" 283 284config NETDEVICES 285 bool 286 default NET 287 288source "arch/um/Kconfig.net" 289 290source "drivers/net/Kconfig" 291 292source "fs/Kconfig" 293 294source "security/Kconfig" 295 296source "crypto/Kconfig" 297 298source "lib/Kconfig" 299 300menu "SCSI support" 301depends on BROKEN 302 303config SCSI 304 tristate "SCSI support" 305 306# This gives us free_dma, which scsi.c wants. 307config GENERIC_ISA_DMA 308 bool 309 depends on SCSI 310 default y 311 312source "arch/um/Kconfig.scsi" 313 314endmenu 315 316source "drivers/md/Kconfig" 317 318if BROKEN 319 source "drivers/mtd/Kconfig" 320endif 321 322#This is just to shut up some Kconfig warnings, so no prompt. 323config INPUT 324 bool 325 default n 326 327source "arch/um/Kconfig.debug" 328