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