1HXCOMM Use DEFHEADING() to define headings in both help text and texi 2HXCOMM Text between STEXI and ETEXI are copied to texi version and 3HXCOMM discarded from C version 4HXCOMM DEF(option, HAS_ARG/0, opt_enum, opt_help, arch_mask) is used to 5HXCOMM construct option structures, enums and help message for specified 6HXCOMM architectures. 7HXCOMM HXCOMM can be used for comments, discarded from both texi and C 8 9DEFHEADING(Standard options:) 10STEXI 11@table @option 12ETEXI 13 14DEF("help", 0, QEMU_OPTION_h, 15 "-h or -help display this help and exit\n", QEMU_ARCH_ALL) 16STEXI 17@item -h 18@findex -h 19Display help and exit 20ETEXI 21 22DEF("version", 0, QEMU_OPTION_version, 23 "-version display version information and exit\n", QEMU_ARCH_ALL) 24STEXI 25@item -version 26@findex -version 27Display version information and exit 28ETEXI 29 30DEF("machine", HAS_ARG, QEMU_OPTION_machine, \ 31 "-machine [type=]name[,prop[=value][,...]]\n" 32 " selects emulated machine ('-machine help' for list)\n" 33 " property accel=accel1[:accel2[:...]] selects accelerator\n" 34 " supported accelerators are kvm, xen, hax, hvf, whpx or tcg (default: tcg)\n" 35 " kernel_irqchip=on|off|split controls accelerated irqchip support (default=off)\n" 36 " vmport=on|off|auto controls emulation of vmport (default: auto)\n" 37 " kvm_shadow_mem=size of KVM shadow MMU in bytes\n" 38 " dump-guest-core=on|off include guest memory in a core dump (default=on)\n" 39 " mem-merge=on|off controls memory merge support (default: on)\n" 40 " igd-passthru=on|off controls IGD GFX passthrough support (default=off)\n" 41 " aes-key-wrap=on|off controls support for AES key wrapping (default=on)\n" 42 " dea-key-wrap=on|off controls support for DEA key wrapping (default=on)\n" 43 " suppress-vmdesc=on|off disables self-describing migration (default=off)\n" 44 " nvdimm=on|off controls NVDIMM support (default=off)\n" 45 " enforce-config-section=on|off enforce configuration section migration (default=off)\n" 46 " memory-encryption=@var{} memory encryption object to use (default=none)\n", 47 QEMU_ARCH_ALL) 48STEXI 49@item -machine [type=]@var{name}[,prop=@var{value}[,...]] 50@findex -machine 51Select the emulated machine by @var{name}. Use @code{-machine help} to list 52available machines. 53 54For architectures which aim to support live migration compatibility 55across releases, each release will introduce a new versioned machine 56type. For example, the 2.8.0 release introduced machine types 57``pc-i440fx-2.8'' and ``pc-q35-2.8'' for the x86_64/i686 architectures. 58 59To allow live migration of guests from QEMU version 2.8.0, to QEMU 60version 2.9.0, the 2.9.0 version must support the ``pc-i440fx-2.8'' 61and ``pc-q35-2.8'' machines too. To allow users live migrating VMs 62to skip multiple intermediate releases when upgrading, new releases 63of QEMU will support machine types from many previous versions. 64 65Supported machine properties are: 66@table @option 67@item accel=@var{accels1}[:@var{accels2}[:...]] 68This is used to enable an accelerator. Depending on the target architecture, 69kvm, xen, hax, hvf, whpx or tcg can be available. By default, tcg is used. If there is 70more than one accelerator specified, the next one is used if the previous one 71fails to initialize. 72@item kernel_irqchip=on|off 73Controls in-kernel irqchip support for the chosen accelerator when available. 74@item gfx_passthru=on|off 75Enables IGD GFX passthrough support for the chosen machine when available. 76@item vmport=on|off|auto 77Enables emulation of VMWare IO port, for vmmouse etc. auto says to select the 78value based on accel. For accel=xen the default is off otherwise the default 79is on. 80@item kvm_shadow_mem=size 81Defines the size of the KVM shadow MMU. 82@item dump-guest-core=on|off 83Include guest memory in a core dump. The default is on. 84@item mem-merge=on|off 85Enables or disables memory merge support. This feature, when supported by 86the host, de-duplicates identical memory pages among VMs instances 87(enabled by default). 88@item aes-key-wrap=on|off 89Enables or disables AES key wrapping support on s390-ccw hosts. This feature 90controls whether AES wrapping keys will be created to allow 91execution of AES cryptographic functions. The default is on. 92@item dea-key-wrap=on|off 93Enables or disables DEA key wrapping support on s390-ccw hosts. This feature 94controls whether DEA wrapping keys will be created to allow 95execution of DEA cryptographic functions. The default is on. 96@item nvdimm=on|off 97Enables or disables NVDIMM support. The default is off. 98@item enforce-config-section=on|off 99If @option{enforce-config-section} is set to @var{on}, force migration 100code to send configuration section even if the machine-type sets the 101@option{migration.send-configuration} property to @var{off}. 102NOTE: this parameter is deprecated. Please use @option{-global} 103@option{migration.send-configuration}=@var{on|off} instead. 104@item memory-encryption=@var{} 105Memory encryption object to use. The default is none. 106@end table 107ETEXI 108 109HXCOMM Deprecated by -machine 110DEF("M", HAS_ARG, QEMU_OPTION_M, "", QEMU_ARCH_ALL) 111 112DEF("cpu", HAS_ARG, QEMU_OPTION_cpu, 113 "-cpu cpu select CPU ('-cpu help' for list)\n", QEMU_ARCH_ALL) 114STEXI 115@item -cpu @var{model} 116@findex -cpu 117Select CPU model (@code{-cpu help} for list and additional feature selection) 118ETEXI 119 120DEF("accel", HAS_ARG, QEMU_OPTION_accel, 121 "-accel [accel=]accelerator[,thread=single|multi]\n" 122 " select accelerator (kvm, xen, hax, hvf, whpx or tcg; use 'help' for a list)\n" 123 " thread=single|multi (enable multi-threaded TCG)\n", QEMU_ARCH_ALL) 124STEXI 125@item -accel @var{name}[,prop=@var{value}[,...]] 126@findex -accel 127This is used to enable an accelerator. Depending on the target architecture, 128kvm, xen, hax, hvf, whpx or tcg can be available. By default, tcg is used. If there is 129more than one accelerator specified, the next one is used if the previous one 130fails to initialize. 131@table @option 132@item thread=single|multi 133Controls number of TCG threads. When the TCG is multi-threaded there will be one 134thread per vCPU therefor taking advantage of additional host cores. The default 135is to enable multi-threading where both the back-end and front-ends support it and 136no incompatible TCG features have been enabled (e.g. icount/replay). 137@end table 138ETEXI 139 140DEF("smp", HAS_ARG, QEMU_OPTION_smp, 141 "-smp [cpus=]n[,maxcpus=cpus][,cores=cores][,threads=threads][,sockets=sockets]\n" 142 " set the number of CPUs to 'n' [default=1]\n" 143 " maxcpus= maximum number of total cpus, including\n" 144 " offline CPUs for hotplug, etc\n" 145 " cores= number of CPU cores on one socket\n" 146 " threads= number of threads on one CPU core\n" 147 " sockets= number of discrete sockets in the system\n", 148 QEMU_ARCH_ALL) 149STEXI 150@item -smp [cpus=]@var{n}[,cores=@var{cores}][,threads=@var{threads}][,sockets=@var{sockets}][,maxcpus=@var{maxcpus}] 151@findex -smp 152Simulate an SMP system with @var{n} CPUs. On the PC target, up to 255 153CPUs are supported. On Sparc32 target, Linux limits the number of usable CPUs 154to 4. 155For the PC target, the number of @var{cores} per socket, the number 156of @var{threads} per cores and the total number of @var{sockets} can be 157specified. Missing values will be computed. If any on the three values is 158given, the total number of CPUs @var{n} can be omitted. @var{maxcpus} 159specifies the maximum number of hotpluggable CPUs. 160ETEXI 161 162DEF("numa", HAS_ARG, QEMU_OPTION_numa, 163 "-numa node[,mem=size][,cpus=firstcpu[-lastcpu]][,nodeid=node]\n" 164 "-numa node[,memdev=id][,cpus=firstcpu[-lastcpu]][,nodeid=node]\n" 165 "-numa dist,src=source,dst=destination,val=distance\n" 166 "-numa cpu,node-id=node[,socket-id=x][,core-id=y][,thread-id=z]\n", 167 QEMU_ARCH_ALL) 168STEXI 169@item -numa node[,mem=@var{size}][,cpus=@var{firstcpu}[-@var{lastcpu}]][,nodeid=@var{node}] 170@itemx -numa node[,memdev=@var{id}][,cpus=@var{firstcpu}[-@var{lastcpu}]][,nodeid=@var{node}] 171@itemx -numa dist,src=@var{source},dst=@var{destination},val=@var{distance} 172@itemx -numa cpu,node-id=@var{node}[,socket-id=@var{x}][,core-id=@var{y}][,thread-id=@var{z}] 173@findex -numa 174Define a NUMA node and assign RAM and VCPUs to it. 175Set the NUMA distance from a source node to a destination node. 176 177Legacy VCPU assignment uses @samp{cpus} option where 178@var{firstcpu} and @var{lastcpu} are CPU indexes. Each 179@samp{cpus} option represent a contiguous range of CPU indexes 180(or a single VCPU if @var{lastcpu} is omitted). A non-contiguous 181set of VCPUs can be represented by providing multiple @samp{cpus} 182options. If @samp{cpus} is omitted on all nodes, VCPUs are automatically 183split between them. 184 185For example, the following option assigns VCPUs 0, 1, 2 and 5 to 186a NUMA node: 187@example 188-numa node,cpus=0-2,cpus=5 189@end example 190 191@samp{cpu} option is a new alternative to @samp{cpus} option 192which uses @samp{socket-id|core-id|thread-id} properties to assign 193CPU objects to a @var{node} using topology layout properties of CPU. 194The set of properties is machine specific, and depends on used 195machine type/@samp{smp} options. It could be queried with 196@samp{hotpluggable-cpus} monitor command. 197@samp{node-id} property specifies @var{node} to which CPU object 198will be assigned, it's required for @var{node} to be declared 199with @samp{node} option before it's used with @samp{cpu} option. 200 201For example: 202@example 203-M pc \ 204-smp 1,sockets=2,maxcpus=2 \ 205-numa node,nodeid=0 -numa node,nodeid=1 \ 206-numa cpu,node-id=0,socket-id=0 -numa cpu,node-id=1,socket-id=1 207@end example 208 209@samp{mem} assigns a given RAM amount to a node. @samp{memdev} 210assigns RAM from a given memory backend device to a node. If 211@samp{mem} and @samp{memdev} are omitted in all nodes, RAM is 212split equally between them. 213 214@samp{mem} and @samp{memdev} are mutually exclusive. Furthermore, 215if one node uses @samp{memdev}, all of them have to use it. 216 217@var{source} and @var{destination} are NUMA node IDs. 218@var{distance} is the NUMA distance from @var{source} to @var{destination}. 219The distance from a node to itself is always 10. If any pair of nodes is 220given a distance, then all pairs must be given distances. Although, when 221distances are only given in one direction for each pair of nodes, then 222the distances in the opposite directions are assumed to be the same. If, 223however, an asymmetrical pair of distances is given for even one node 224pair, then all node pairs must be provided distance values for both 225directions, even when they are symmetrical. When a node is unreachable 226from another node, set the pair's distance to 255. 227 228Note that the -@option{numa} option doesn't allocate any of the 229specified resources, it just assigns existing resources to NUMA 230nodes. This means that one still has to use the @option{-m}, 231@option{-smp} options to allocate RAM and VCPUs respectively. 232 233ETEXI 234 235DEF("add-fd", HAS_ARG, QEMU_OPTION_add_fd, 236 "-add-fd fd=fd,set=set[,opaque=opaque]\n" 237 " Add 'fd' to fd 'set'\n", QEMU_ARCH_ALL) 238STEXI 239@item -add-fd fd=@var{fd},set=@var{set}[,opaque=@var{opaque}] 240@findex -add-fd 241 242Add a file descriptor to an fd set. Valid options are: 243 244@table @option 245@item fd=@var{fd} 246This option defines the file descriptor of which a duplicate is added to fd set. 247The file descriptor cannot be stdin, stdout, or stderr. 248@item set=@var{set} 249This option defines the ID of the fd set to add the file descriptor to. 250@item opaque=@var{opaque} 251This option defines a free-form string that can be used to describe @var{fd}. 252@end table 253 254You can open an image using pre-opened file descriptors from an fd set: 255@example 256qemu-system-i386 257-add-fd fd=3,set=2,opaque="rdwr:/path/to/file" 258-add-fd fd=4,set=2,opaque="rdonly:/path/to/file" 259-drive file=/dev/fdset/2,index=0,media=disk 260@end example 261ETEXI 262 263DEF("set", HAS_ARG, QEMU_OPTION_set, 264 "-set group.id.arg=value\n" 265 " set <arg> parameter for item <id> of type <group>\n" 266 " i.e. -set drive.$id.file=/path/to/image\n", QEMU_ARCH_ALL) 267STEXI 268@item -set @var{group}.@var{id}.@var{arg}=@var{value} 269@findex -set 270Set parameter @var{arg} for item @var{id} of type @var{group} 271ETEXI 272 273DEF("global", HAS_ARG, QEMU_OPTION_global, 274 "-global driver.property=value\n" 275 "-global driver=driver,property=property,value=value\n" 276 " set a global default for a driver property\n", 277 QEMU_ARCH_ALL) 278STEXI 279@item -global @var{driver}.@var{prop}=@var{value} 280@itemx -global driver=@var{driver},property=@var{property},value=@var{value} 281@findex -global 282Set default value of @var{driver}'s property @var{prop} to @var{value}, e.g.: 283 284@example 285qemu-system-i386 -global ide-hd.physical_block_size=4096 disk-image.img 286@end example 287 288In particular, you can use this to set driver properties for devices which are 289created automatically by the machine model. To create a device which is not 290created automatically and set properties on it, use -@option{device}. 291 292-global @var{driver}.@var{prop}=@var{value} is shorthand for -global 293driver=@var{driver},property=@var{prop},value=@var{value}. The 294longhand syntax works even when @var{driver} contains a dot. 295ETEXI 296 297DEF("boot", HAS_ARG, QEMU_OPTION_boot, 298 "-boot [order=drives][,once=drives][,menu=on|off]\n" 299 " [,splash=sp_name][,splash-time=sp_time][,reboot-timeout=rb_time][,strict=on|off]\n" 300 " 'drives': floppy (a), hard disk (c), CD-ROM (d), network (n)\n" 301 " 'sp_name': the file's name that would be passed to bios as logo picture, if menu=on\n" 302 " 'sp_time': the period that splash picture last if menu=on, unit is ms\n" 303 " 'rb_timeout': the timeout before guest reboot when boot failed, unit is ms\n", 304 QEMU_ARCH_ALL) 305STEXI 306@item -boot [order=@var{drives}][,once=@var{drives}][,menu=on|off][,splash=@var{sp_name}][,splash-time=@var{sp_time}][,reboot-timeout=@var{rb_timeout}][,strict=on|off] 307@findex -boot 308Specify boot order @var{drives} as a string of drive letters. Valid 309drive letters depend on the target architecture. The x86 PC uses: a, b 310(floppy 1 and 2), c (first hard disk), d (first CD-ROM), n-p (Etherboot 311from network adapter 1-4), hard disk boot is the default. To apply a 312particular boot order only on the first startup, specify it via 313@option{once}. Note that the @option{order} or @option{once} parameter 314should not be used together with the @option{bootindex} property of 315devices, since the firmware implementations normally do not support both 316at the same time. 317 318Interactive boot menus/prompts can be enabled via @option{menu=on} as far 319as firmware/BIOS supports them. The default is non-interactive boot. 320 321A splash picture could be passed to bios, enabling user to show it as logo, 322when option splash=@var{sp_name} is given and menu=on, If firmware/BIOS 323supports them. Currently Seabios for X86 system support it. 324limitation: The splash file could be a jpeg file or a BMP file in 24 BPP 325format(true color). The resolution should be supported by the SVGA mode, so 326the recommended is 320x240, 640x480, 800x640. 327 328A timeout could be passed to bios, guest will pause for @var{rb_timeout} ms 329when boot failed, then reboot. If @var{rb_timeout} is '-1', guest will not 330reboot, qemu passes '-1' to bios by default. Currently Seabios for X86 331system support it. 332 333Do strict boot via @option{strict=on} as far as firmware/BIOS 334supports it. This only effects when boot priority is changed by 335bootindex options. The default is non-strict boot. 336 337@example 338# try to boot from network first, then from hard disk 339qemu-system-i386 -boot order=nc 340# boot from CD-ROM first, switch back to default order after reboot 341qemu-system-i386 -boot once=d 342# boot with a splash picture for 5 seconds. 343qemu-system-i386 -boot menu=on,splash=/root/boot.bmp,splash-time=5000 344@end example 345 346Note: The legacy format '-boot @var{drives}' is still supported but its 347use is discouraged as it may be removed from future versions. 348ETEXI 349 350DEF("m", HAS_ARG, QEMU_OPTION_m, 351 "-m [size=]megs[,slots=n,maxmem=size]\n" 352 " configure guest RAM\n" 353 " size: initial amount of guest memory\n" 354 " slots: number of hotplug slots (default: none)\n" 355 " maxmem: maximum amount of guest memory (default: none)\n" 356 "NOTE: Some architectures might enforce a specific granularity\n", 357 QEMU_ARCH_ALL) 358STEXI 359@item -m [size=]@var{megs}[,slots=n,maxmem=size] 360@findex -m 361Sets guest startup RAM size to @var{megs} megabytes. Default is 128 MiB. 362Optionally, a suffix of ``M'' or ``G'' can be used to signify a value in 363megabytes or gigabytes respectively. Optional pair @var{slots}, @var{maxmem} 364could be used to set amount of hotpluggable memory slots and maximum amount of 365memory. Note that @var{maxmem} must be aligned to the page size. 366 367For example, the following command-line sets the guest startup RAM size to 3681GB, creates 3 slots to hotplug additional memory and sets the maximum 369memory the guest can reach to 4GB: 370 371@example 372qemu-system-x86_64 -m 1G,slots=3,maxmem=4G 373@end example 374 375If @var{slots} and @var{maxmem} are not specified, memory hotplug won't 376be enabled and the guest startup RAM will never increase. 377ETEXI 378 379DEF("mem-path", HAS_ARG, QEMU_OPTION_mempath, 380 "-mem-path FILE provide backing storage for guest RAM\n", QEMU_ARCH_ALL) 381STEXI 382@item -mem-path @var{path} 383@findex -mem-path 384Allocate guest RAM from a temporarily created file in @var{path}. 385ETEXI 386 387DEF("mem-prealloc", 0, QEMU_OPTION_mem_prealloc, 388 "-mem-prealloc preallocate guest memory (use with -mem-path)\n", 389 QEMU_ARCH_ALL) 390STEXI 391@item -mem-prealloc 392@findex -mem-prealloc 393Preallocate memory when using -mem-path. 394ETEXI 395 396DEF("k", HAS_ARG, QEMU_OPTION_k, 397 "-k language use keyboard layout (for example 'fr' for French)\n", 398 QEMU_ARCH_ALL) 399STEXI 400@item -k @var{language} 401@findex -k 402Use keyboard layout @var{language} (for example @code{fr} for 403French). This option is only needed where it is not easy to get raw PC 404keycodes (e.g. on Macs, with some X11 servers or with a VNC or curses 405display). You don't normally need to use it on PC/Linux or PC/Windows 406hosts. 407 408The available layouts are: 409@example 410ar de-ch es fo fr-ca hu ja mk no pt-br sv 411da en-gb et fr fr-ch is lt nl pl ru th 412de en-us fi fr-be hr it lv nl-be pt sl tr 413@end example 414 415The default is @code{en-us}. 416ETEXI 417 418 419DEF("audio-help", 0, QEMU_OPTION_audio_help, 420 "-audio-help print list of audio drivers and their options\n", 421 QEMU_ARCH_ALL) 422STEXI 423@item -audio-help 424@findex -audio-help 425Will show the audio subsystem help: list of drivers, tunable 426parameters. 427ETEXI 428 429DEF("soundhw", HAS_ARG, QEMU_OPTION_soundhw, 430 "-soundhw c1,... enable audio support\n" 431 " and only specified sound cards (comma separated list)\n" 432 " use '-soundhw help' to get the list of supported cards\n" 433 " use '-soundhw all' to enable all of them\n", QEMU_ARCH_ALL) 434STEXI 435@item -soundhw @var{card1}[,@var{card2},...] or -soundhw all 436@findex -soundhw 437Enable audio and selected sound hardware. Use 'help' to print all 438available sound hardware. 439 440@example 441qemu-system-i386 -soundhw sb16,adlib disk.img 442qemu-system-i386 -soundhw es1370 disk.img 443qemu-system-i386 -soundhw ac97 disk.img 444qemu-system-i386 -soundhw hda disk.img 445qemu-system-i386 -soundhw all disk.img 446qemu-system-i386 -soundhw help 447@end example 448 449Note that Linux's i810_audio OSS kernel (for AC97) module might 450require manually specifying clocking. 451 452@example 453modprobe i810_audio clocking=48000 454@end example 455ETEXI 456 457DEF("device", HAS_ARG, QEMU_OPTION_device, 458 "-device driver[,prop[=value][,...]]\n" 459 " add device (based on driver)\n" 460 " prop=value,... sets driver properties\n" 461 " use '-device help' to print all possible drivers\n" 462 " use '-device driver,help' to print all possible properties\n", 463 QEMU_ARCH_ALL) 464STEXI 465@item -device @var{driver}[,@var{prop}[=@var{value}][,...]] 466@findex -device 467Add device @var{driver}. @var{prop}=@var{value} sets driver 468properties. Valid properties depend on the driver. To get help on 469possible drivers and properties, use @code{-device help} and 470@code{-device @var{driver},help}. 471 472Some drivers are: 473@item -device ipmi-bmc-sim,id=@var{id}[,slave_addr=@var{val}][,sdrfile=@var{file}][,furareasize=@var{val}][,furdatafile=@var{file}] 474 475Add an IPMI BMC. This is a simulation of a hardware management 476interface processor that normally sits on a system. It provides 477a watchdog and the ability to reset and power control the system. 478You need to connect this to an IPMI interface to make it useful 479 480The IPMI slave address to use for the BMC. The default is 0x20. 481This address is the BMC's address on the I2C network of management 482controllers. If you don't know what this means, it is safe to ignore 483it. 484 485@table @option 486@item bmc=@var{id} 487The BMC to connect to, one of ipmi-bmc-sim or ipmi-bmc-extern above. 488@item slave_addr=@var{val} 489Define slave address to use for the BMC. The default is 0x20. 490@item sdrfile=@var{file} 491file containing raw Sensor Data Records (SDR) data. The default is none. 492@item fruareasize=@var{val} 493size of a Field Replaceable Unit (FRU) area. The default is 1024. 494@item frudatafile=@var{file} 495file containing raw Field Replaceable Unit (FRU) inventory data. The default is none. 496@end table 497 498@item -device ipmi-bmc-extern,id=@var{id},chardev=@var{id}[,slave_addr=@var{val}] 499 500Add a connection to an external IPMI BMC simulator. Instead of 501locally emulating the BMC like the above item, instead connect 502to an external entity that provides the IPMI services. 503 504A connection is made to an external BMC simulator. If you do this, it 505is strongly recommended that you use the "reconnect=" chardev option 506to reconnect to the simulator if the connection is lost. Note that if 507this is not used carefully, it can be a security issue, as the 508interface has the ability to send resets, NMIs, and power off the VM. 509It's best if QEMU makes a connection to an external simulator running 510on a secure port on localhost, so neither the simulator nor QEMU is 511exposed to any outside network. 512 513See the "lanserv/README.vm" file in the OpenIPMI library for more 514details on the external interface. 515 516@item -device isa-ipmi-kcs,bmc=@var{id}[,ioport=@var{val}][,irq=@var{val}] 517 518Add a KCS IPMI interafce on the ISA bus. This also adds a 519corresponding ACPI and SMBIOS entries, if appropriate. 520 521@table @option 522@item bmc=@var{id} 523The BMC to connect to, one of ipmi-bmc-sim or ipmi-bmc-extern above. 524@item ioport=@var{val} 525Define the I/O address of the interface. The default is 0xca0 for KCS. 526@item irq=@var{val} 527Define the interrupt to use. The default is 5. To disable interrupts, 528set this to 0. 529@end table 530 531@item -device isa-ipmi-bt,bmc=@var{id}[,ioport=@var{val}][,irq=@var{val}] 532 533Like the KCS interface, but defines a BT interface. The default port is 5340xe4 and the default interrupt is 5. 535 536ETEXI 537 538DEF("name", HAS_ARG, QEMU_OPTION_name, 539 "-name string1[,process=string2][,debug-threads=on|off]\n" 540 " set the name of the guest\n" 541 " string1 sets the window title and string2 the process name\n" 542 " When debug-threads is enabled, individual threads are given a separate name\n" 543 " NOTE: The thread names are for debugging and not a stable API.\n", 544 QEMU_ARCH_ALL) 545STEXI 546@item -name @var{name} 547@findex -name 548Sets the @var{name} of the guest. 549This name will be displayed in the SDL window caption. 550The @var{name} will also be used for the VNC server. 551Also optionally set the top visible process name in Linux. 552Naming of individual threads can also be enabled on Linux to aid debugging. 553ETEXI 554 555DEF("uuid", HAS_ARG, QEMU_OPTION_uuid, 556 "-uuid %08x-%04x-%04x-%04x-%012x\n" 557 " specify machine UUID\n", QEMU_ARCH_ALL) 558STEXI 559@item -uuid @var{uuid} 560@findex -uuid 561Set system UUID. 562ETEXI 563 564STEXI 565@end table 566ETEXI 567DEFHEADING() 568 569DEFHEADING(Block device options:) 570STEXI 571@table @option 572ETEXI 573 574DEF("fda", HAS_ARG, QEMU_OPTION_fda, 575 "-fda/-fdb file use 'file' as floppy disk 0/1 image\n", QEMU_ARCH_ALL) 576DEF("fdb", HAS_ARG, QEMU_OPTION_fdb, "", QEMU_ARCH_ALL) 577STEXI 578@item -fda @var{file} 579@itemx -fdb @var{file} 580@findex -fda 581@findex -fdb 582Use @var{file} as floppy disk 0/1 image (@pxref{disk_images}). 583ETEXI 584 585DEF("hda", HAS_ARG, QEMU_OPTION_hda, 586 "-hda/-hdb file use 'file' as IDE hard disk 0/1 image\n", QEMU_ARCH_ALL) 587DEF("hdb", HAS_ARG, QEMU_OPTION_hdb, "", QEMU_ARCH_ALL) 588DEF("hdc", HAS_ARG, QEMU_OPTION_hdc, 589 "-hdc/-hdd file use 'file' as IDE hard disk 2/3 image\n", QEMU_ARCH_ALL) 590DEF("hdd", HAS_ARG, QEMU_OPTION_hdd, "", QEMU_ARCH_ALL) 591STEXI 592@item -hda @var{file} 593@itemx -hdb @var{file} 594@itemx -hdc @var{file} 595@itemx -hdd @var{file} 596@findex -hda 597@findex -hdb 598@findex -hdc 599@findex -hdd 600Use @var{file} as hard disk 0, 1, 2 or 3 image (@pxref{disk_images}). 601ETEXI 602 603DEF("cdrom", HAS_ARG, QEMU_OPTION_cdrom, 604 "-cdrom file use 'file' as IDE cdrom image (cdrom is ide1 master)\n", 605 QEMU_ARCH_ALL) 606STEXI 607@item -cdrom @var{file} 608@findex -cdrom 609Use @var{file} as CD-ROM image (you cannot use @option{-hdc} and 610@option{-cdrom} at the same time). You can use the host CD-ROM by 611using @file{/dev/cdrom} as filename (@pxref{host_drives}). 612ETEXI 613 614DEF("blockdev", HAS_ARG, QEMU_OPTION_blockdev, 615 "-blockdev [driver=]driver[,node-name=N][,discard=ignore|unmap]\n" 616 " [,cache.direct=on|off][,cache.no-flush=on|off]\n" 617 " [,read-only=on|off][,detect-zeroes=on|off|unmap]\n" 618 " [,driver specific parameters...]\n" 619 " configure a block backend\n", QEMU_ARCH_ALL) 620STEXI 621@item -blockdev @var{option}[,@var{option}[,@var{option}[,...]]] 622@findex -blockdev 623 624Define a new block driver node. Some of the options apply to all block drivers, 625other options are only accepted for a specific block driver. See below for a 626list of generic options and options for the most common block drivers. 627 628Options that expect a reference to another node (e.g. @code{file}) can be 629given in two ways. Either you specify the node name of an already existing node 630(file=@var{node-name}), or you define a new node inline, adding options 631for the referenced node after a dot (file.filename=@var{path},file.aio=native). 632 633A block driver node created with @option{-blockdev} can be used for a guest 634device by specifying its node name for the @code{drive} property in a 635@option{-device} argument that defines a block device. 636 637@table @option 638@item Valid options for any block driver node: 639 640@table @code 641@item driver 642Specifies the block driver to use for the given node. 643@item node-name 644This defines the name of the block driver node by which it will be referenced 645later. The name must be unique, i.e. it must not match the name of a different 646block driver node, or (if you use @option{-drive} as well) the ID of a drive. 647 648If no node name is specified, it is automatically generated. The generated node 649name is not intended to be predictable and changes between QEMU invocations. 650For the top level, an explicit node name must be specified. 651@item read-only 652Open the node read-only. Guest write attempts will fail. 653@item cache.direct 654The host page cache can be avoided with @option{cache.direct=on}. This will 655attempt to do disk IO directly to the guest's memory. QEMU may still perform an 656internal copy of the data. 657@item cache.no-flush 658In case you don't care about data integrity over host failures, you can use 659@option{cache.no-flush=on}. This option tells QEMU that it never needs to write 660any data to the disk but can instead keep things in cache. If anything goes 661wrong, like your host losing power, the disk storage getting disconnected 662accidentally, etc. your image will most probably be rendered unusable. 663@item discard=@var{discard} 664@var{discard} is one of "ignore" (or "off") or "unmap" (or "on") and controls 665whether @code{discard} (also known as @code{trim} or @code{unmap}) requests are 666ignored or passed to the filesystem. Some machine types may not support 667discard requests. 668@item detect-zeroes=@var{detect-zeroes} 669@var{detect-zeroes} is "off", "on" or "unmap" and enables the automatic 670conversion of plain zero writes by the OS to driver specific optimized 671zero write commands. You may even choose "unmap" if @var{discard} is set 672to "unmap" to allow a zero write to be converted to an @code{unmap} operation. 673@end table 674 675@item Driver-specific options for @code{file} 676 677This is the protocol-level block driver for accessing regular files. 678 679@table @code 680@item filename 681The path to the image file in the local filesystem 682@item aio 683Specifies the AIO backend (threads/native, default: threads) 684@item locking 685Specifies whether the image file is protected with Linux OFD / POSIX locks. The 686default is to use the Linux Open File Descriptor API if available, otherwise no 687lock is applied. (auto/on/off, default: auto) 688@end table 689Example: 690@example 691-blockdev driver=file,node-name=disk,filename=disk.img 692@end example 693 694@item Driver-specific options for @code{raw} 695 696This is the image format block driver for raw images. It is usually 697stacked on top of a protocol level block driver such as @code{file}. 698 699@table @code 700@item file 701Reference to or definition of the data source block driver node 702(e.g. a @code{file} driver node) 703@end table 704Example 1: 705@example 706-blockdev driver=file,node-name=disk_file,filename=disk.img 707-blockdev driver=raw,node-name=disk,file=disk_file 708@end example 709Example 2: 710@example 711-blockdev driver=raw,node-name=disk,file.driver=file,file.filename=disk.img 712@end example 713 714@item Driver-specific options for @code{qcow2} 715 716This is the image format block driver for qcow2 images. It is usually 717stacked on top of a protocol level block driver such as @code{file}. 718 719@table @code 720@item file 721Reference to or definition of the data source block driver node 722(e.g. a @code{file} driver node) 723 724@item backing 725Reference to or definition of the backing file block device (default is taken 726from the image file). It is allowed to pass @code{null} here in order to disable 727the default backing file. 728 729@item lazy-refcounts 730Whether to enable the lazy refcounts feature (on/off; default is taken from the 731image file) 732 733@item cache-size 734The maximum total size of the L2 table and refcount block caches in bytes 735(default: the sum of l2-cache-size and refcount-cache-size) 736 737@item l2-cache-size 738The maximum size of the L2 table cache in bytes 739(default: if cache-size is not specified - 32M on Linux platforms, and 8M on 740non-Linux platforms; otherwise, as large as possible within the cache-size, 741while permitting the requested or the minimal refcount cache size) 742 743@item refcount-cache-size 744The maximum size of the refcount block cache in bytes 745(default: 4 times the cluster size; or if cache-size is specified, the part of 746it which is not used for the L2 cache) 747 748@item cache-clean-interval 749Clean unused entries in the L2 and refcount caches. The interval is in seconds. 750The default value is 600 on supporting platforms, and 0 on other platforms. 751Setting it to 0 disables this feature. 752 753@item pass-discard-request 754Whether discard requests to the qcow2 device should be forwarded to the data 755source (on/off; default: on if discard=unmap is specified, off otherwise) 756 757@item pass-discard-snapshot 758Whether discard requests for the data source should be issued when a snapshot 759operation (e.g. deleting a snapshot) frees clusters in the qcow2 file (on/off; 760default: on) 761 762@item pass-discard-other 763Whether discard requests for the data source should be issued on other 764occasions where a cluster gets freed (on/off; default: off) 765 766@item overlap-check 767Which overlap checks to perform for writes to the image 768(none/constant/cached/all; default: cached). For details or finer 769granularity control refer to the QAPI documentation of @code{blockdev-add}. 770@end table 771 772Example 1: 773@example 774-blockdev driver=file,node-name=my_file,filename=/tmp/disk.qcow2 775-blockdev driver=qcow2,node-name=hda,file=my_file,overlap-check=none,cache-size=16777216 776@end example 777Example 2: 778@example 779-blockdev driver=qcow2,node-name=disk,file.driver=http,file.filename=http://example.com/image.qcow2 780@end example 781 782@item Driver-specific options for other drivers 783Please refer to the QAPI documentation of the @code{blockdev-add} QMP command. 784 785@end table 786 787ETEXI 788 789DEF("drive", HAS_ARG, QEMU_OPTION_drive, 790 "-drive [file=file][,if=type][,bus=n][,unit=m][,media=d][,index=i]\n" 791 " [,cache=writethrough|writeback|none|directsync|unsafe][,format=f]\n" 792 " [,snapshot=on|off][,rerror=ignore|stop|report]\n" 793 " [,werror=ignore|stop|report|enospc][,id=name][,aio=threads|native]\n" 794 " [,readonly=on|off][,copy-on-read=on|off]\n" 795 " [,discard=ignore|unmap][,detect-zeroes=on|off|unmap]\n" 796 " [[,bps=b]|[[,bps_rd=r][,bps_wr=w]]]\n" 797 " [[,iops=i]|[[,iops_rd=r][,iops_wr=w]]]\n" 798 " [[,bps_max=bm]|[[,bps_rd_max=rm][,bps_wr_max=wm]]]\n" 799 " [[,iops_max=im]|[[,iops_rd_max=irm][,iops_wr_max=iwm]]]\n" 800 " [[,iops_size=is]]\n" 801 " [[,group=g]]\n" 802 " use 'file' as a drive image\n", QEMU_ARCH_ALL) 803STEXI 804@item -drive @var{option}[,@var{option}[,@var{option}[,...]]] 805@findex -drive 806 807Define a new drive. This includes creating a block driver node (the backend) as 808well as a guest device, and is mostly a shortcut for defining the corresponding 809@option{-blockdev} and @option{-device} options. 810 811@option{-drive} accepts all options that are accepted by @option{-blockdev}. In 812addition, it knows the following options: 813 814@table @option 815@item file=@var{file} 816This option defines which disk image (@pxref{disk_images}) to use with 817this drive. If the filename contains comma, you must double it 818(for instance, "file=my,,file" to use file "my,file"). 819 820Special files such as iSCSI devices can be specified using protocol 821specific URLs. See the section for "Device URL Syntax" for more information. 822@item if=@var{interface} 823This option defines on which type on interface the drive is connected. 824Available types are: ide, scsi, sd, mtd, floppy, pflash, virtio, none. 825@item bus=@var{bus},unit=@var{unit} 826These options define where is connected the drive by defining the bus number and 827the unit id. 828@item index=@var{index} 829This option defines where is connected the drive by using an index in the list 830of available connectors of a given interface type. 831@item media=@var{media} 832This option defines the type of the media: disk or cdrom. 833@item snapshot=@var{snapshot} 834@var{snapshot} is "on" or "off" and controls snapshot mode for the given drive 835(see @option{-snapshot}). 836@item cache=@var{cache} 837@var{cache} is "none", "writeback", "unsafe", "directsync" or "writethrough" 838and controls how the host cache is used to access block data. This is a 839shortcut that sets the @option{cache.direct} and @option{cache.no-flush} 840options (as in @option{-blockdev}), and additionally @option{cache.writeback}, 841which provides a default for the @option{write-cache} option of block guest 842devices (as in @option{-device}). The modes correspond to the following 843settings: 844 845@c Our texi2pod.pl script doesn't support @multitable, so fall back to using 846@c plain ASCII art (well, UTF-8 art really). This looks okay both in the manpage 847@c and the HTML output. 848@example 849@ │ cache.writeback cache.direct cache.no-flush 850─────────────┼───────────────────────────────────────────────── 851writeback │ on off off 852none │ on on off 853writethrough │ off off off 854directsync │ off on off 855unsafe │ on off on 856@end example 857 858The default mode is @option{cache=writeback}. 859 860@item aio=@var{aio} 861@var{aio} is "threads", or "native" and selects between pthread based disk I/O and native Linux AIO. 862@item format=@var{format} 863Specify which disk @var{format} will be used rather than detecting 864the format. Can be used to specify format=raw to avoid interpreting 865an untrusted format header. 866@item werror=@var{action},rerror=@var{action} 867Specify which @var{action} to take on write and read errors. Valid actions are: 868"ignore" (ignore the error and try to continue), "stop" (pause QEMU), 869"report" (report the error to the guest), "enospc" (pause QEMU only if the 870host disk is full; report the error to the guest otherwise). 871The default setting is @option{werror=enospc} and @option{rerror=report}. 872@item copy-on-read=@var{copy-on-read} 873@var{copy-on-read} is "on" or "off" and enables whether to copy read backing 874file sectors into the image file. 875@item bps=@var{b},bps_rd=@var{r},bps_wr=@var{w} 876Specify bandwidth throttling limits in bytes per second, either for all request 877types or for reads or writes only. Small values can lead to timeouts or hangs 878inside the guest. A safe minimum for disks is 2 MB/s. 879@item bps_max=@var{bm},bps_rd_max=@var{rm},bps_wr_max=@var{wm} 880Specify bursts in bytes per second, either for all request types or for reads 881or writes only. Bursts allow the guest I/O to spike above the limit 882temporarily. 883@item iops=@var{i},iops_rd=@var{r},iops_wr=@var{w} 884Specify request rate limits in requests per second, either for all request 885types or for reads or writes only. 886@item iops_max=@var{bm},iops_rd_max=@var{rm},iops_wr_max=@var{wm} 887Specify bursts in requests per second, either for all request types or for reads 888or writes only. Bursts allow the guest I/O to spike above the limit 889temporarily. 890@item iops_size=@var{is} 891Let every @var{is} bytes of a request count as a new request for iops 892throttling purposes. Use this option to prevent guests from circumventing iops 893limits by sending fewer but larger requests. 894@item group=@var{g} 895Join a throttling quota group with given name @var{g}. All drives that are 896members of the same group are accounted for together. Use this option to 897prevent guests from circumventing throttling limits by using many small disks 898instead of a single larger disk. 899@end table 900 901By default, the @option{cache.writeback=on} mode is used. It will report data 902writes as completed as soon as the data is present in the host page cache. 903This is safe as long as your guest OS makes sure to correctly flush disk caches 904where needed. If your guest OS does not handle volatile disk write caches 905correctly and your host crashes or loses power, then the guest may experience 906data corruption. 907 908For such guests, you should consider using @option{cache.writeback=off}. This 909means that the host page cache will be used to read and write data, but write 910notification will be sent to the guest only after QEMU has made sure to flush 911each write to the disk. Be aware that this has a major impact on performance. 912 913When using the @option{-snapshot} option, unsafe caching is always used. 914 915Copy-on-read avoids accessing the same backing file sectors repeatedly and is 916useful when the backing file is over a slow network. By default copy-on-read 917is off. 918 919Instead of @option{-cdrom} you can use: 920@example 921qemu-system-i386 -drive file=file,index=2,media=cdrom 922@end example 923 924Instead of @option{-hda}, @option{-hdb}, @option{-hdc}, @option{-hdd}, you can 925use: 926@example 927qemu-system-i386 -drive file=file,index=0,media=disk 928qemu-system-i386 -drive file=file,index=1,media=disk 929qemu-system-i386 -drive file=file,index=2,media=disk 930qemu-system-i386 -drive file=file,index=3,media=disk 931@end example 932 933You can open an image using pre-opened file descriptors from an fd set: 934@example 935qemu-system-i386 936-add-fd fd=3,set=2,opaque="rdwr:/path/to/file" 937-add-fd fd=4,set=2,opaque="rdonly:/path/to/file" 938-drive file=/dev/fdset/2,index=0,media=disk 939@end example 940 941You can connect a CDROM to the slave of ide0: 942@example 943qemu-system-i386 -drive file=file,if=ide,index=1,media=cdrom 944@end example 945 946If you don't specify the "file=" argument, you define an empty drive: 947@example 948qemu-system-i386 -drive if=ide,index=1,media=cdrom 949@end example 950 951Instead of @option{-fda}, @option{-fdb}, you can use: 952@example 953qemu-system-i386 -drive file=file,index=0,if=floppy 954qemu-system-i386 -drive file=file,index=1,if=floppy 955@end example 956 957By default, @var{interface} is "ide" and @var{index} is automatically 958incremented: 959@example 960qemu-system-i386 -drive file=a -drive file=b" 961@end example 962is interpreted like: 963@example 964qemu-system-i386 -hda a -hdb b 965@end example 966ETEXI 967 968DEF("mtdblock", HAS_ARG, QEMU_OPTION_mtdblock, 969 "-mtdblock file use 'file' as on-board Flash memory image\n", 970 QEMU_ARCH_ALL) 971STEXI 972@item -mtdblock @var{file} 973@findex -mtdblock 974Use @var{file} as on-board Flash memory image. 975ETEXI 976 977DEF("sd", HAS_ARG, QEMU_OPTION_sd, 978 "-sd file use 'file' as SecureDigital card image\n", QEMU_ARCH_ALL) 979STEXI 980@item -sd @var{file} 981@findex -sd 982Use @var{file} as SecureDigital card image. 983ETEXI 984 985DEF("pflash", HAS_ARG, QEMU_OPTION_pflash, 986 "-pflash file use 'file' as a parallel flash image\n", QEMU_ARCH_ALL) 987STEXI 988@item -pflash @var{file} 989@findex -pflash 990Use @var{file} as a parallel flash image. 991ETEXI 992 993DEF("snapshot", 0, QEMU_OPTION_snapshot, 994 "-snapshot write to temporary files instead of disk image files\n", 995 QEMU_ARCH_ALL) 996STEXI 997@item -snapshot 998@findex -snapshot 999Write to temporary files instead of disk image files. In this case, 1000the raw disk image you use is not written back. You can however force 1001the write back by pressing @key{C-a s} (@pxref{disk_images}). 1002ETEXI 1003 1004DEF("fsdev", HAS_ARG, QEMU_OPTION_fsdev, 1005 "-fsdev fsdriver,id=id[,path=path,][security_model={mapped-xattr|mapped-file|passthrough|none}]\n" 1006 " [,writeout=immediate][,readonly][,socket=socket|sock_fd=sock_fd][,fmode=fmode][,dmode=dmode]\n" 1007 " [[,throttling.bps-total=b]|[[,throttling.bps-read=r][,throttling.bps-write=w]]]\n" 1008 " [[,throttling.iops-total=i]|[[,throttling.iops-read=r][,throttling.iops-write=w]]]\n" 1009 " [[,throttling.bps-total-max=bm]|[[,throttling.bps-read-max=rm][,throttling.bps-write-max=wm]]]\n" 1010 " [[,throttling.iops-total-max=im]|[[,throttling.iops-read-max=irm][,throttling.iops-write-max=iwm]]]\n" 1011 " [[,throttling.iops-size=is]]\n", 1012 QEMU_ARCH_ALL) 1013 1014STEXI 1015 1016@item -fsdev @var{fsdriver},id=@var{id},path=@var{path},[security_model=@var{security_model}][,writeout=@var{writeout}][,readonly][,socket=@var{socket}|sock_fd=@var{sock_fd}][,fmode=@var{fmode}][,dmode=@var{dmode}] 1017@findex -fsdev 1018Define a new file system device. Valid options are: 1019@table @option 1020@item @var{fsdriver} 1021This option specifies the fs driver backend to use. 1022Currently "local" and "proxy" file system drivers are supported. 1023@item id=@var{id} 1024Specifies identifier for this device 1025@item path=@var{path} 1026Specifies the export path for the file system device. Files under 1027this path will be available to the 9p client on the guest. 1028@item security_model=@var{security_model} 1029Specifies the security model to be used for this export path. 1030Supported security models are "passthrough", "mapped-xattr", "mapped-file" and "none". 1031In "passthrough" security model, files are stored using the same 1032credentials as they are created on the guest. This requires QEMU 1033to run as root. In "mapped-xattr" security model, some of the file 1034attributes like uid, gid, mode bits and link target are stored as 1035file attributes. For "mapped-file" these attributes are stored in the 1036hidden .virtfs_metadata directory. Directories exported by this security model cannot 1037interact with other unix tools. "none" security model is same as 1038passthrough except the sever won't report failures if it fails to 1039set file attributes like ownership. Security model is mandatory 1040only for local fsdriver. Other fsdrivers (like proxy) don't take 1041security model as a parameter. 1042@item writeout=@var{writeout} 1043This is an optional argument. The only supported value is "immediate". 1044This means that host page cache will be used to read and write data but 1045write notification will be sent to the guest only when the data has been 1046reported as written by the storage subsystem. 1047@item readonly 1048Enables exporting 9p share as a readonly mount for guests. By default 1049read-write access is given. 1050@item socket=@var{socket} 1051Enables proxy filesystem driver to use passed socket file for communicating 1052with virtfs-proxy-helper 1053@item sock_fd=@var{sock_fd} 1054Enables proxy filesystem driver to use passed socket descriptor for 1055communicating with virtfs-proxy-helper. Usually a helper like libvirt 1056will create socketpair and pass one of the fds as sock_fd 1057@item fmode=@var{fmode} 1058Specifies the default mode for newly created files on the host. Works only 1059with security models "mapped-xattr" and "mapped-file". 1060@item dmode=@var{dmode} 1061Specifies the default mode for newly created directories on the host. Works 1062only with security models "mapped-xattr" and "mapped-file". 1063@end table 1064 1065-fsdev option is used along with -device driver "virtio-9p-pci". 1066@item -device virtio-9p-pci,fsdev=@var{id},mount_tag=@var{mount_tag} 1067Options for virtio-9p-pci driver are: 1068@table @option 1069@item fsdev=@var{id} 1070Specifies the id value specified along with -fsdev option 1071@item mount_tag=@var{mount_tag} 1072Specifies the tag name to be used by the guest to mount this export point 1073@end table 1074 1075ETEXI 1076 1077DEF("virtfs", HAS_ARG, QEMU_OPTION_virtfs, 1078 "-virtfs local,path=path,mount_tag=tag,security_model=[mapped-xattr|mapped-file|passthrough|none]\n" 1079 " [,id=id][,writeout=immediate][,readonly][,socket=socket|sock_fd=sock_fd][,fmode=fmode][,dmode=dmode]\n", 1080 QEMU_ARCH_ALL) 1081 1082STEXI 1083 1084@item -virtfs @var{fsdriver}[,path=@var{path}],mount_tag=@var{mount_tag}[,security_model=@var{security_model}][,writeout=@var{writeout}][,readonly][,socket=@var{socket}|sock_fd=@var{sock_fd}][,fmode=@var{fmode}][,dmode=@var{dmode}] 1085@findex -virtfs 1086 1087The general form of a Virtual File system pass-through options are: 1088@table @option 1089@item @var{fsdriver} 1090This option specifies the fs driver backend to use. 1091Currently "local" and "proxy" file system drivers are supported. 1092@item id=@var{id} 1093Specifies identifier for this device 1094@item path=@var{path} 1095Specifies the export path for the file system device. Files under 1096this path will be available to the 9p client on the guest. 1097@item security_model=@var{security_model} 1098Specifies the security model to be used for this export path. 1099Supported security models are "passthrough", "mapped-xattr", "mapped-file" and "none". 1100In "passthrough" security model, files are stored using the same 1101credentials as they are created on the guest. This requires QEMU 1102to run as root. In "mapped-xattr" security model, some of the file 1103attributes like uid, gid, mode bits and link target are stored as 1104file attributes. For "mapped-file" these attributes are stored in the 1105hidden .virtfs_metadata directory. Directories exported by this security model cannot 1106interact with other unix tools. "none" security model is same as 1107passthrough except the sever won't report failures if it fails to 1108set file attributes like ownership. Security model is mandatory only 1109for local fsdriver. Other fsdrivers (like proxy) don't take security 1110model as a parameter. 1111@item writeout=@var{writeout} 1112This is an optional argument. The only supported value is "immediate". 1113This means that host page cache will be used to read and write data but 1114write notification will be sent to the guest only when the data has been 1115reported as written by the storage subsystem. 1116@item readonly 1117Enables exporting 9p share as a readonly mount for guests. By default 1118read-write access is given. 1119@item socket=@var{socket} 1120Enables proxy filesystem driver to use passed socket file for 1121communicating with virtfs-proxy-helper. Usually a helper like libvirt 1122will create socketpair and pass one of the fds as sock_fd 1123@item sock_fd 1124Enables proxy filesystem driver to use passed 'sock_fd' as the socket 1125descriptor for interfacing with virtfs-proxy-helper 1126@item fmode=@var{fmode} 1127Specifies the default mode for newly created files on the host. Works only 1128with security models "mapped-xattr" and "mapped-file". 1129@item dmode=@var{dmode} 1130Specifies the default mode for newly created directories on the host. Works 1131only with security models "mapped-xattr" and "mapped-file". 1132@end table 1133ETEXI 1134 1135DEF("virtfs_synth", 0, QEMU_OPTION_virtfs_synth, 1136 "-virtfs_synth Create synthetic file system image\n", 1137 QEMU_ARCH_ALL) 1138STEXI 1139@item -virtfs_synth 1140@findex -virtfs_synth 1141Create synthetic file system image 1142ETEXI 1143 1144DEF("iscsi", HAS_ARG, QEMU_OPTION_iscsi, 1145 "-iscsi [user=user][,password=password]\n" 1146 " [,header-digest=CRC32C|CR32C-NONE|NONE-CRC32C|NONE\n" 1147 " [,initiator-name=initiator-iqn][,id=target-iqn]\n" 1148 " [,timeout=timeout]\n" 1149 " iSCSI session parameters\n", QEMU_ARCH_ALL) 1150 1151STEXI 1152@item -iscsi 1153@findex -iscsi 1154Configure iSCSI session parameters. 1155ETEXI 1156 1157STEXI 1158@end table 1159ETEXI 1160DEFHEADING() 1161 1162DEFHEADING(USB options:) 1163STEXI 1164@table @option 1165ETEXI 1166 1167DEF("usb", 0, QEMU_OPTION_usb, 1168 "-usb enable the USB driver (if it is not used by default yet)\n", 1169 QEMU_ARCH_ALL) 1170STEXI 1171@item -usb 1172@findex -usb 1173Enable the USB driver (if it is not used by default yet). 1174ETEXI 1175 1176DEF("usbdevice", HAS_ARG, QEMU_OPTION_usbdevice, 1177 "-usbdevice name add the host or guest USB device 'name'\n", 1178 QEMU_ARCH_ALL) 1179STEXI 1180 1181@item -usbdevice @var{devname} 1182@findex -usbdevice 1183Add the USB device @var{devname}. Note that this option is deprecated, 1184please use @code{-device usb-...} instead. @xref{usb_devices}. 1185 1186@table @option 1187 1188@item mouse 1189Virtual Mouse. This will override the PS/2 mouse emulation when activated. 1190 1191@item tablet 1192Pointer device that uses absolute coordinates (like a touchscreen). This 1193means QEMU is able to report the mouse position without having to grab the 1194mouse. Also overrides the PS/2 mouse emulation when activated. 1195 1196@item braille 1197Braille device. This will use BrlAPI to display the braille output on a real 1198or fake device. 1199 1200@end table 1201ETEXI 1202 1203STEXI 1204@end table 1205ETEXI 1206DEFHEADING() 1207 1208DEFHEADING(Display options:) 1209STEXI 1210@table @option 1211ETEXI 1212 1213DEF("display", HAS_ARG, QEMU_OPTION_display, 1214 "-display sdl[,frame=on|off][,alt_grab=on|off][,ctrl_grab=on|off]\n" 1215 " [,window_close=on|off][,gl=on|core|es|off]\n" 1216 "-display gtk[,grab_on_hover=on|off][,gl=on|off]|\n" 1217 "-display vnc=<display>[,<optargs>]\n" 1218 "-display curses\n" 1219 "-display none\n" 1220 "-display egl-headless[,rendernode=<file>]" 1221 " select display type\n" 1222 "The default display is equivalent to\n" 1223#if defined(CONFIG_GTK) 1224 "\t\"-display gtk\"\n" 1225#elif defined(CONFIG_SDL) 1226 "\t\"-display sdl\"\n" 1227#elif defined(CONFIG_COCOA) 1228 "\t\"-display cocoa\"\n" 1229#elif defined(CONFIG_VNC) 1230 "\t\"-vnc localhost:0,to=99,id=default\"\n" 1231#else 1232 "\t\"-display none\"\n" 1233#endif 1234 , QEMU_ARCH_ALL) 1235STEXI 1236@item -display @var{type} 1237@findex -display 1238Select type of display to use. This option is a replacement for the 1239old style -sdl/-curses/... options. Valid values for @var{type} are 1240@table @option 1241@item sdl 1242Display video output via SDL (usually in a separate graphics 1243window; see the SDL documentation for other possibilities). 1244@item curses 1245Display video output via curses. For graphics device models which 1246support a text mode, QEMU can display this output using a 1247curses/ncurses interface. Nothing is displayed when the graphics 1248device is in graphical mode or if the graphics device does not support 1249a text mode. Generally only the VGA device models support text mode. 1250@item none 1251Do not display video output. The guest will still see an emulated 1252graphics card, but its output will not be displayed to the QEMU 1253user. This option differs from the -nographic option in that it 1254only affects what is done with video output; -nographic also changes 1255the destination of the serial and parallel port data. 1256@item gtk 1257Display video output in a GTK window. This interface provides drop-down 1258menus and other UI elements to configure and control the VM during 1259runtime. 1260@item vnc 1261Start a VNC server on display <arg> 1262@item egl-headless 1263Offload all OpenGL operations to a local DRI device. For any graphical display, 1264this display needs to be paired with either VNC or SPICE displays. 1265@end table 1266ETEXI 1267 1268DEF("nographic", 0, QEMU_OPTION_nographic, 1269 "-nographic disable graphical output and redirect serial I/Os to console\n", 1270 QEMU_ARCH_ALL) 1271STEXI 1272@item -nographic 1273@findex -nographic 1274Normally, if QEMU is compiled with graphical window support, it displays 1275output such as guest graphics, guest console, and the QEMU monitor in a 1276window. With this option, you can totally disable graphical output so 1277that QEMU is a simple command line application. The emulated serial port 1278is redirected on the console and muxed with the monitor (unless 1279redirected elsewhere explicitly). Therefore, you can still use QEMU to 1280debug a Linux kernel with a serial console. Use @key{C-a h} for help on 1281switching between the console and monitor. 1282ETEXI 1283 1284DEF("curses", 0, QEMU_OPTION_curses, 1285 "-curses shorthand for -display curses\n", 1286 QEMU_ARCH_ALL) 1287STEXI 1288@item -curses 1289@findex -curses 1290Normally, if QEMU is compiled with graphical window support, it displays 1291output such as guest graphics, guest console, and the QEMU monitor in a 1292window. With this option, QEMU can display the VGA output when in text 1293mode using a curses/ncurses interface. Nothing is displayed in graphical 1294mode. 1295ETEXI 1296 1297DEF("alt-grab", 0, QEMU_OPTION_alt_grab, 1298 "-alt-grab use Ctrl-Alt-Shift to grab mouse (instead of Ctrl-Alt)\n", 1299 QEMU_ARCH_ALL) 1300STEXI 1301@item -alt-grab 1302@findex -alt-grab 1303Use Ctrl-Alt-Shift to grab mouse (instead of Ctrl-Alt). Note that this also 1304affects the special keys (for fullscreen, monitor-mode switching, etc). 1305ETEXI 1306 1307DEF("ctrl-grab", 0, QEMU_OPTION_ctrl_grab, 1308 "-ctrl-grab use Right-Ctrl to grab mouse (instead of Ctrl-Alt)\n", 1309 QEMU_ARCH_ALL) 1310STEXI 1311@item -ctrl-grab 1312@findex -ctrl-grab 1313Use Right-Ctrl to grab mouse (instead of Ctrl-Alt). Note that this also 1314affects the special keys (for fullscreen, monitor-mode switching, etc). 1315ETEXI 1316 1317DEF("no-quit", 0, QEMU_OPTION_no_quit, 1318 "-no-quit disable SDL window close capability\n", QEMU_ARCH_ALL) 1319STEXI 1320@item -no-quit 1321@findex -no-quit 1322Disable SDL window close capability. 1323ETEXI 1324 1325DEF("sdl", 0, QEMU_OPTION_sdl, 1326 "-sdl shorthand for -display sdl\n", QEMU_ARCH_ALL) 1327STEXI 1328@item -sdl 1329@findex -sdl 1330Enable SDL. 1331ETEXI 1332 1333DEF("spice", HAS_ARG, QEMU_OPTION_spice, 1334 "-spice [port=port][,tls-port=secured-port][,x509-dir=<dir>]\n" 1335 " [,x509-key-file=<file>][,x509-key-password=<file>]\n" 1336 " [,x509-cert-file=<file>][,x509-cacert-file=<file>]\n" 1337 " [,x509-dh-key-file=<file>][,addr=addr][,ipv4|ipv6|unix]\n" 1338 " [,tls-ciphers=<list>]\n" 1339 " [,tls-channel=[main|display|cursor|inputs|record|playback]]\n" 1340 " [,plaintext-channel=[main|display|cursor|inputs|record|playback]]\n" 1341 " [,sasl][,password=<secret>][,disable-ticketing]\n" 1342 " [,image-compression=[auto_glz|auto_lz|quic|glz|lz|off]]\n" 1343 " [,jpeg-wan-compression=[auto|never|always]]\n" 1344 " [,zlib-glz-wan-compression=[auto|never|always]]\n" 1345 " [,streaming-video=[off|all|filter]][,disable-copy-paste]\n" 1346 " [,disable-agent-file-xfer][,agent-mouse=[on|off]]\n" 1347 " [,playback-compression=[on|off]][,seamless-migration=[on|off]]\n" 1348 " [,gl=[on|off]][,rendernode=<file>]\n" 1349 " enable spice\n" 1350 " at least one of {port, tls-port} is mandatory\n", 1351 QEMU_ARCH_ALL) 1352STEXI 1353@item -spice @var{option}[,@var{option}[,...]] 1354@findex -spice 1355Enable the spice remote desktop protocol. Valid options are 1356 1357@table @option 1358 1359@item port=<nr> 1360Set the TCP port spice is listening on for plaintext channels. 1361 1362@item addr=<addr> 1363Set the IP address spice is listening on. Default is any address. 1364 1365@item ipv4 1366@itemx ipv6 1367@itemx unix 1368Force using the specified IP version. 1369 1370@item password=<secret> 1371Set the password you need to authenticate. 1372 1373@item sasl 1374Require that the client use SASL to authenticate with the spice. 1375The exact choice of authentication method used is controlled from the 1376system / user's SASL configuration file for the 'qemu' service. This 1377is typically found in /etc/sasl2/qemu.conf. If running QEMU as an 1378unprivileged user, an environment variable SASL_CONF_PATH can be used 1379to make it search alternate locations for the service config. 1380While some SASL auth methods can also provide data encryption (eg GSSAPI), 1381it is recommended that SASL always be combined with the 'tls' and 1382'x509' settings to enable use of SSL and server certificates. This 1383ensures a data encryption preventing compromise of authentication 1384credentials. 1385 1386@item disable-ticketing 1387Allow client connects without authentication. 1388 1389@item disable-copy-paste 1390Disable copy paste between the client and the guest. 1391 1392@item disable-agent-file-xfer 1393Disable spice-vdagent based file-xfer between the client and the guest. 1394 1395@item tls-port=<nr> 1396Set the TCP port spice is listening on for encrypted channels. 1397 1398@item x509-dir=<dir> 1399Set the x509 file directory. Expects same filenames as -vnc $display,x509=$dir 1400 1401@item x509-key-file=<file> 1402@itemx x509-key-password=<file> 1403@itemx x509-cert-file=<file> 1404@itemx x509-cacert-file=<file> 1405@itemx x509-dh-key-file=<file> 1406The x509 file names can also be configured individually. 1407 1408@item tls-ciphers=<list> 1409Specify which ciphers to use. 1410 1411@item tls-channel=[main|display|cursor|inputs|record|playback] 1412@itemx plaintext-channel=[main|display|cursor|inputs|record|playback] 1413Force specific channel to be used with or without TLS encryption. The 1414options can be specified multiple times to configure multiple 1415channels. The special name "default" can be used to set the default 1416mode. For channels which are not explicitly forced into one mode the 1417spice client is allowed to pick tls/plaintext as he pleases. 1418 1419@item image-compression=[auto_glz|auto_lz|quic|glz|lz|off] 1420Configure image compression (lossless). 1421Default is auto_glz. 1422 1423@item jpeg-wan-compression=[auto|never|always] 1424@itemx zlib-glz-wan-compression=[auto|never|always] 1425Configure wan image compression (lossy for slow links). 1426Default is auto. 1427 1428@item streaming-video=[off|all|filter] 1429Configure video stream detection. Default is off. 1430 1431@item agent-mouse=[on|off] 1432Enable/disable passing mouse events via vdagent. Default is on. 1433 1434@item playback-compression=[on|off] 1435Enable/disable audio stream compression (using celt 0.5.1). Default is on. 1436 1437@item seamless-migration=[on|off] 1438Enable/disable spice seamless migration. Default is off. 1439 1440@item gl=[on|off] 1441Enable/disable OpenGL context. Default is off. 1442 1443@item rendernode=<file> 1444DRM render node for OpenGL rendering. If not specified, it will pick 1445the first available. (Since 2.9) 1446 1447@end table 1448ETEXI 1449 1450DEF("portrait", 0, QEMU_OPTION_portrait, 1451 "-portrait rotate graphical output 90 deg left (only PXA LCD)\n", 1452 QEMU_ARCH_ALL) 1453STEXI 1454@item -portrait 1455@findex -portrait 1456Rotate graphical output 90 deg left (only PXA LCD). 1457ETEXI 1458 1459DEF("rotate", HAS_ARG, QEMU_OPTION_rotate, 1460 "-rotate <deg> rotate graphical output some deg left (only PXA LCD)\n", 1461 QEMU_ARCH_ALL) 1462STEXI 1463@item -rotate @var{deg} 1464@findex -rotate 1465Rotate graphical output some deg left (only PXA LCD). 1466ETEXI 1467 1468DEF("vga", HAS_ARG, QEMU_OPTION_vga, 1469 "-vga [std|cirrus|vmware|qxl|xenfb|tcx|cg3|virtio|none]\n" 1470 " select video card type\n", QEMU_ARCH_ALL) 1471STEXI 1472@item -vga @var{type} 1473@findex -vga 1474Select type of VGA card to emulate. Valid values for @var{type} are 1475@table @option 1476@item cirrus 1477Cirrus Logic GD5446 Video card. All Windows versions starting from 1478Windows 95 should recognize and use this graphic card. For optimal 1479performances, use 16 bit color depth in the guest and the host OS. 1480(This card was the default before QEMU 2.2) 1481@item std 1482Standard VGA card with Bochs VBE extensions. If your guest OS 1483supports the VESA 2.0 VBE extensions (e.g. Windows XP) and if you want 1484to use high resolution modes (>= 1280x1024x16) then you should use 1485this option. (This card is the default since QEMU 2.2) 1486@item vmware 1487VMWare SVGA-II compatible adapter. Use it if you have sufficiently 1488recent XFree86/XOrg server or Windows guest with a driver for this 1489card. 1490@item qxl 1491QXL paravirtual graphic card. It is VGA compatible (including VESA 14922.0 VBE support). Works best with qxl guest drivers installed though. 1493Recommended choice when using the spice protocol. 1494@item tcx 1495(sun4m only) Sun TCX framebuffer. This is the default framebuffer for 1496sun4m machines and offers both 8-bit and 24-bit colour depths at a 1497fixed resolution of 1024x768. 1498@item cg3 1499(sun4m only) Sun cgthree framebuffer. This is a simple 8-bit framebuffer 1500for sun4m machines available in both 1024x768 (OpenBIOS) and 1152x900 (OBP) 1501resolutions aimed at people wishing to run older Solaris versions. 1502@item virtio 1503Virtio VGA card. 1504@item none 1505Disable VGA card. 1506@end table 1507ETEXI 1508 1509DEF("full-screen", 0, QEMU_OPTION_full_screen, 1510 "-full-screen start in full screen\n", QEMU_ARCH_ALL) 1511STEXI 1512@item -full-screen 1513@findex -full-screen 1514Start in full screen. 1515ETEXI 1516 1517DEF("g", 1, QEMU_OPTION_g , 1518 "-g WxH[xDEPTH] Set the initial graphical resolution and depth\n", 1519 QEMU_ARCH_PPC | QEMU_ARCH_SPARC) 1520STEXI 1521@item -g @var{width}x@var{height}[x@var{depth}] 1522@findex -g 1523Set the initial graphical resolution and depth (PPC, SPARC only). 1524ETEXI 1525 1526DEF("vnc", HAS_ARG, QEMU_OPTION_vnc , 1527 "-vnc <display> shorthand for -display vnc=<display>\n", QEMU_ARCH_ALL) 1528STEXI 1529@item -vnc @var{display}[,@var{option}[,@var{option}[,...]]] 1530@findex -vnc 1531Normally, if QEMU is compiled with graphical window support, it displays 1532output such as guest graphics, guest console, and the QEMU monitor in a 1533window. With this option, you can have QEMU listen on VNC display 1534@var{display} and redirect the VGA display over the VNC session. It is 1535very useful to enable the usb tablet device when using this option 1536(option @option{-device usb-tablet}). When using the VNC display, you 1537must use the @option{-k} parameter to set the keyboard layout if you are 1538not using en-us. Valid syntax for the @var{display} is 1539 1540@table @option 1541 1542@item to=@var{L} 1543 1544With this option, QEMU will try next available VNC @var{display}s, until the 1545number @var{L}, if the origianlly defined "-vnc @var{display}" is not 1546available, e.g. port 5900+@var{display} is already used by another 1547application. By default, to=0. 1548 1549@item @var{host}:@var{d} 1550 1551TCP connections will only be allowed from @var{host} on display @var{d}. 1552By convention the TCP port is 5900+@var{d}. Optionally, @var{host} can 1553be omitted in which case the server will accept connections from any host. 1554 1555@item unix:@var{path} 1556 1557Connections will be allowed over UNIX domain sockets where @var{path} is the 1558location of a unix socket to listen for connections on. 1559 1560@item none 1561 1562VNC is initialized but not started. The monitor @code{change} command 1563can be used to later start the VNC server. 1564 1565@end table 1566 1567Following the @var{display} value there may be one or more @var{option} flags 1568separated by commas. Valid options are 1569 1570@table @option 1571 1572@item reverse 1573 1574Connect to a listening VNC client via a ``reverse'' connection. The 1575client is specified by the @var{display}. For reverse network 1576connections (@var{host}:@var{d},@code{reverse}), the @var{d} argument 1577is a TCP port number, not a display number. 1578 1579@item websocket 1580 1581Opens an additional TCP listening port dedicated to VNC Websocket connections. 1582If a bare @var{websocket} option is given, the Websocket port is 15835700+@var{display}. An alternative port can be specified with the 1584syntax @code{websocket}=@var{port}. 1585 1586If @var{host} is specified connections will only be allowed from this host. 1587It is possible to control the websocket listen address independently, using 1588the syntax @code{websocket}=@var{host}:@var{port}. 1589 1590If no TLS credentials are provided, the websocket connection runs in 1591unencrypted mode. If TLS credentials are provided, the websocket connection 1592requires encrypted client connections. 1593 1594@item password 1595 1596Require that password based authentication is used for client connections. 1597 1598The password must be set separately using the @code{set_password} command in 1599the @ref{pcsys_monitor}. The syntax to change your password is: 1600@code{set_password <protocol> <password>} where <protocol> could be either 1601"vnc" or "spice". 1602 1603If you would like to change <protocol> password expiration, you should use 1604@code{expire_password <protocol> <expiration-time>} where expiration time could 1605be one of the following options: now, never, +seconds or UNIX time of 1606expiration, e.g. +60 to make password expire in 60 seconds, or 1335196800 1607to make password expire on "Mon Apr 23 12:00:00 EDT 2012" (UNIX time for this 1608date and time). 1609 1610You can also use keywords "now" or "never" for the expiration time to 1611allow <protocol> password to expire immediately or never expire. 1612 1613@item tls-creds=@var{ID} 1614 1615Provides the ID of a set of TLS credentials to use to secure the 1616VNC server. They will apply to both the normal VNC server socket 1617and the websocket socket (if enabled). Setting TLS credentials 1618will cause the VNC server socket to enable the VeNCrypt auth 1619mechanism. The credentials should have been previously created 1620using the @option{-object tls-creds} argument. 1621 1622@item sasl 1623 1624Require that the client use SASL to authenticate with the VNC server. 1625The exact choice of authentication method used is controlled from the 1626system / user's SASL configuration file for the 'qemu' service. This 1627is typically found in /etc/sasl2/qemu.conf. If running QEMU as an 1628unprivileged user, an environment variable SASL_CONF_PATH can be used 1629to make it search alternate locations for the service config. 1630While some SASL auth methods can also provide data encryption (eg GSSAPI), 1631it is recommended that SASL always be combined with the 'tls' and 1632'x509' settings to enable use of SSL and server certificates. This 1633ensures a data encryption preventing compromise of authentication 1634credentials. See the @ref{vnc_security} section for details on using 1635SASL authentication. 1636 1637@item acl 1638 1639Turn on access control lists for checking of the x509 client certificate 1640and SASL party. For x509 certs, the ACL check is made against the 1641certificate's distinguished name. This is something that looks like 1642@code{C=GB,O=ACME,L=Boston,CN=bob}. For SASL party, the ACL check is 1643made against the username, which depending on the SASL plugin, may 1644include a realm component, eg @code{bob} or @code{bob@@EXAMPLE.COM}. 1645When the @option{acl} flag is set, the initial access list will be 1646empty, with a @code{deny} policy. Thus no one will be allowed to 1647use the VNC server until the ACLs have been loaded. This can be 1648achieved using the @code{acl} monitor command. 1649 1650@item lossy 1651 1652Enable lossy compression methods (gradient, JPEG, ...). If this 1653option is set, VNC client may receive lossy framebuffer updates 1654depending on its encoding settings. Enabling this option can save 1655a lot of bandwidth at the expense of quality. 1656 1657@item non-adaptive 1658 1659Disable adaptive encodings. Adaptive encodings are enabled by default. 1660An adaptive encoding will try to detect frequently updated screen regions, 1661and send updates in these regions using a lossy encoding (like JPEG). 1662This can be really helpful to save bandwidth when playing videos. Disabling 1663adaptive encodings restores the original static behavior of encodings 1664like Tight. 1665 1666@item share=[allow-exclusive|force-shared|ignore] 1667 1668Set display sharing policy. 'allow-exclusive' allows clients to ask 1669for exclusive access. As suggested by the rfb spec this is 1670implemented by dropping other connections. Connecting multiple 1671clients in parallel requires all clients asking for a shared session 1672(vncviewer: -shared switch). This is the default. 'force-shared' 1673disables exclusive client access. Useful for shared desktop sessions, 1674where you don't want someone forgetting specify -shared disconnect 1675everybody else. 'ignore' completely ignores the shared flag and 1676allows everybody connect unconditionally. Doesn't conform to the rfb 1677spec but is traditional QEMU behavior. 1678 1679@item key-delay-ms 1680 1681Set keyboard delay, for key down and key up events, in milliseconds. 1682Default is 10. Keyboards are low-bandwidth devices, so this slowdown 1683can help the device and guest to keep up and not lose events in case 1684events are arriving in bulk. Possible causes for the latter are flaky 1685network connections, or scripts for automated testing. 1686 1687@end table 1688ETEXI 1689 1690STEXI 1691@end table 1692ETEXI 1693ARCHHEADING(, QEMU_ARCH_I386) 1694 1695ARCHHEADING(i386 target only:, QEMU_ARCH_I386) 1696STEXI 1697@table @option 1698ETEXI 1699 1700DEF("win2k-hack", 0, QEMU_OPTION_win2k_hack, 1701 "-win2k-hack use it when installing Windows 2000 to avoid a disk full bug\n", 1702 QEMU_ARCH_I386) 1703STEXI 1704@item -win2k-hack 1705@findex -win2k-hack 1706Use it when installing Windows 2000 to avoid a disk full bug. After 1707Windows 2000 is installed, you no longer need this option (this option 1708slows down the IDE transfers). 1709ETEXI 1710 1711DEF("no-fd-bootchk", 0, QEMU_OPTION_no_fd_bootchk, 1712 "-no-fd-bootchk disable boot signature checking for floppy disks\n", 1713 QEMU_ARCH_I386) 1714STEXI 1715@item -no-fd-bootchk 1716@findex -no-fd-bootchk 1717Disable boot signature checking for floppy disks in BIOS. May 1718be needed to boot from old floppy disks. 1719ETEXI 1720 1721DEF("no-acpi", 0, QEMU_OPTION_no_acpi, 1722 "-no-acpi disable ACPI\n", QEMU_ARCH_I386 | QEMU_ARCH_ARM) 1723STEXI 1724@item -no-acpi 1725@findex -no-acpi 1726Disable ACPI (Advanced Configuration and Power Interface) support. Use 1727it if your guest OS complains about ACPI problems (PC target machine 1728only). 1729ETEXI 1730 1731DEF("no-hpet", 0, QEMU_OPTION_no_hpet, 1732 "-no-hpet disable HPET\n", QEMU_ARCH_I386) 1733STEXI 1734@item -no-hpet 1735@findex -no-hpet 1736Disable HPET support. 1737ETEXI 1738 1739DEF("acpitable", HAS_ARG, QEMU_OPTION_acpitable, 1740 "-acpitable [sig=str][,rev=n][,oem_id=str][,oem_table_id=str][,oem_rev=n][,asl_compiler_id=str][,asl_compiler_rev=n][,{data|file}=file1[:file2]...]\n" 1741 " ACPI table description\n", QEMU_ARCH_I386) 1742STEXI 1743@item -acpitable [sig=@var{str}][,rev=@var{n}][,oem_id=@var{str}][,oem_table_id=@var{str}][,oem_rev=@var{n}] [,asl_compiler_id=@var{str}][,asl_compiler_rev=@var{n}][,data=@var{file1}[:@var{file2}]...] 1744@findex -acpitable 1745Add ACPI table with specified header fields and context from specified files. 1746For file=, take whole ACPI table from the specified files, including all 1747ACPI headers (possible overridden by other options). 1748For data=, only data 1749portion of the table is used, all header information is specified in the 1750command line. 1751If a SLIC table is supplied to QEMU, then the SLIC's oem_id and oem_table_id 1752fields will override the same in the RSDT and the FADT (a.k.a. FACP), in order 1753to ensure the field matches required by the Microsoft SLIC spec and the ACPI 1754spec. 1755ETEXI 1756 1757DEF("smbios", HAS_ARG, QEMU_OPTION_smbios, 1758 "-smbios file=binary\n" 1759 " load SMBIOS entry from binary file\n" 1760 "-smbios type=0[,vendor=str][,version=str][,date=str][,release=%d.%d]\n" 1761 " [,uefi=on|off]\n" 1762 " specify SMBIOS type 0 fields\n" 1763 "-smbios type=1[,manufacturer=str][,product=str][,version=str][,serial=str]\n" 1764 " [,uuid=uuid][,sku=str][,family=str]\n" 1765 " specify SMBIOS type 1 fields\n" 1766 "-smbios type=2[,manufacturer=str][,product=str][,version=str][,serial=str]\n" 1767 " [,asset=str][,location=str]\n" 1768 " specify SMBIOS type 2 fields\n" 1769 "-smbios type=3[,manufacturer=str][,version=str][,serial=str][,asset=str]\n" 1770 " [,sku=str]\n" 1771 " specify SMBIOS type 3 fields\n" 1772 "-smbios type=4[,sock_pfx=str][,manufacturer=str][,version=str][,serial=str]\n" 1773 " [,asset=str][,part=str]\n" 1774 " specify SMBIOS type 4 fields\n" 1775 "-smbios type=17[,loc_pfx=str][,bank=str][,manufacturer=str][,serial=str]\n" 1776 " [,asset=str][,part=str][,speed=%d]\n" 1777 " specify SMBIOS type 17 fields\n", 1778 QEMU_ARCH_I386 | QEMU_ARCH_ARM) 1779STEXI 1780@item -smbios file=@var{binary} 1781@findex -smbios 1782Load SMBIOS entry from binary file. 1783 1784@item -smbios type=0[,vendor=@var{str}][,version=@var{str}][,date=@var{str}][,release=@var{%d.%d}][,uefi=on|off] 1785Specify SMBIOS type 0 fields 1786 1787@item -smbios type=1[,manufacturer=@var{str}][,product=@var{str}][,version=@var{str}][,serial=@var{str}][,uuid=@var{uuid}][,sku=@var{str}][,family=@var{str}] 1788Specify SMBIOS type 1 fields 1789 1790@item -smbios type=2[,manufacturer=@var{str}][,product=@var{str}][,version=@var{str}][,serial=@var{str}][,asset=@var{str}][,location=@var{str}][,family=@var{str}] 1791Specify SMBIOS type 2 fields 1792 1793@item -smbios type=3[,manufacturer=@var{str}][,version=@var{str}][,serial=@var{str}][,asset=@var{str}][,sku=@var{str}] 1794Specify SMBIOS type 3 fields 1795 1796@item -smbios type=4[,sock_pfx=@var{str}][,manufacturer=@var{str}][,version=@var{str}][,serial=@var{str}][,asset=@var{str}][,part=@var{str}] 1797Specify SMBIOS type 4 fields 1798 1799@item -smbios type=17[,loc_pfx=@var{str}][,bank=@var{str}][,manufacturer=@var{str}][,serial=@var{str}][,asset=@var{str}][,part=@var{str}][,speed=@var{%d}] 1800Specify SMBIOS type 17 fields 1801ETEXI 1802 1803STEXI 1804@end table 1805ETEXI 1806DEFHEADING() 1807 1808DEFHEADING(Network options:) 1809STEXI 1810@table @option 1811ETEXI 1812 1813DEF("netdev", HAS_ARG, QEMU_OPTION_netdev, 1814#ifdef CONFIG_SLIRP 1815 "-netdev user,id=str[,ipv4[=on|off]][,net=addr[/mask]][,host=addr]\n" 1816 " [,ipv6[=on|off]][,ipv6-net=addr[/int]][,ipv6-host=addr]\n" 1817 " [,restrict=on|off][,hostname=host][,dhcpstart=addr]\n" 1818 " [,dns=addr][,ipv6-dns=addr][,dnssearch=domain][,domainname=domain]\n" 1819 " [,tftp=dir][,tftp-server-name=name][,bootfile=f][,hostfwd=rule][,guestfwd=rule]" 1820#ifndef _WIN32 1821 "[,smb=dir[,smbserver=addr]]\n" 1822#endif 1823 " configure a user mode network backend with ID 'str',\n" 1824 " its DHCP server and optional services\n" 1825#endif 1826#ifdef _WIN32 1827 "-netdev tap,id=str,ifname=name\n" 1828 " configure a host TAP network backend with ID 'str'\n" 1829#else 1830 "-netdev tap,id=str[,fd=h][,fds=x:y:...:z][,ifname=name][,script=file][,downscript=dfile]\n" 1831 " [,br=bridge][,helper=helper][,sndbuf=nbytes][,vnet_hdr=on|off][,vhost=on|off]\n" 1832 " [,vhostfd=h][,vhostfds=x:y:...:z][,vhostforce=on|off][,queues=n]\n" 1833 " [,poll-us=n]\n" 1834 " configure a host TAP network backend with ID 'str'\n" 1835 " connected to a bridge (default=" DEFAULT_BRIDGE_INTERFACE ")\n" 1836 " use network scripts 'file' (default=" DEFAULT_NETWORK_SCRIPT ")\n" 1837 " to configure it and 'dfile' (default=" DEFAULT_NETWORK_DOWN_SCRIPT ")\n" 1838 " to deconfigure it\n" 1839 " use '[down]script=no' to disable script execution\n" 1840 " use network helper 'helper' (default=" DEFAULT_BRIDGE_HELPER ") to\n" 1841 " configure it\n" 1842 " use 'fd=h' to connect to an already opened TAP interface\n" 1843 " use 'fds=x:y:...:z' to connect to already opened multiqueue capable TAP interfaces\n" 1844 " use 'sndbuf=nbytes' to limit the size of the send buffer (the\n" 1845 " default is disabled 'sndbuf=0' to enable flow control set 'sndbuf=1048576')\n" 1846 " use vnet_hdr=off to avoid enabling the IFF_VNET_HDR tap flag\n" 1847 " use vnet_hdr=on to make the lack of IFF_VNET_HDR support an error condition\n" 1848 " use vhost=on to enable experimental in kernel accelerator\n" 1849 " (only has effect for virtio guests which use MSIX)\n" 1850 " use vhostforce=on to force vhost on for non-MSIX virtio guests\n" 1851 " use 'vhostfd=h' to connect to an already opened vhost net device\n" 1852 " use 'vhostfds=x:y:...:z to connect to multiple already opened vhost net devices\n" 1853 " use 'queues=n' to specify the number of queues to be created for multiqueue TAP\n" 1854 " use 'poll-us=n' to speciy the maximum number of microseconds that could be\n" 1855 " spent on busy polling for vhost net\n" 1856 "-netdev bridge,id=str[,br=bridge][,helper=helper]\n" 1857 " configure a host TAP network backend with ID 'str' that is\n" 1858 " connected to a bridge (default=" DEFAULT_BRIDGE_INTERFACE ")\n" 1859 " using the program 'helper (default=" DEFAULT_BRIDGE_HELPER ")\n" 1860#endif 1861#ifdef __linux__ 1862 "-netdev l2tpv3,id=str,src=srcaddr,dst=dstaddr[,srcport=srcport][,dstport=dstport]\n" 1863 " [,rxsession=rxsession],txsession=txsession[,ipv6=on/off][,udp=on/off]\n" 1864 " [,cookie64=on/off][,counter][,pincounter][,txcookie=txcookie]\n" 1865 " [,rxcookie=rxcookie][,offset=offset]\n" 1866 " configure a network backend with ID 'str' connected to\n" 1867 " an Ethernet over L2TPv3 pseudowire.\n" 1868 " Linux kernel 3.3+ as well as most routers can talk\n" 1869 " L2TPv3. This transport allows connecting a VM to a VM,\n" 1870 " VM to a router and even VM to Host. It is a nearly-universal\n" 1871 " standard (RFC3391). Note - this implementation uses static\n" 1872 " pre-configured tunnels (same as the Linux kernel).\n" 1873 " use 'src=' to specify source address\n" 1874 " use 'dst=' to specify destination address\n" 1875 " use 'udp=on' to specify udp encapsulation\n" 1876 " use 'srcport=' to specify source udp port\n" 1877 " use 'dstport=' to specify destination udp port\n" 1878 " use 'ipv6=on' to force v6\n" 1879 " L2TPv3 uses cookies to prevent misconfiguration as\n" 1880 " well as a weak security measure\n" 1881 " use 'rxcookie=0x012345678' to specify a rxcookie\n" 1882 " use 'txcookie=0x012345678' to specify a txcookie\n" 1883 " use 'cookie64=on' to set cookie size to 64 bit, otherwise 32\n" 1884 " use 'counter=off' to force a 'cut-down' L2TPv3 with no counter\n" 1885 " use 'pincounter=on' to work around broken counter handling in peer\n" 1886 " use 'offset=X' to add an extra offset between header and data\n" 1887#endif 1888 "-netdev socket,id=str[,fd=h][,listen=[host]:port][,connect=host:port]\n" 1889 " configure a network backend to connect to another network\n" 1890 " using a socket connection\n" 1891 "-netdev socket,id=str[,fd=h][,mcast=maddr:port[,localaddr=addr]]\n" 1892 " configure a network backend to connect to a multicast maddr and port\n" 1893 " use 'localaddr=addr' to specify the host address to send packets from\n" 1894 "-netdev socket,id=str[,fd=h][,udp=host:port][,localaddr=host:port]\n" 1895 " configure a network backend to connect to another network\n" 1896 " using an UDP tunnel\n" 1897#ifdef CONFIG_VDE 1898 "-netdev vde,id=str[,sock=socketpath][,port=n][,group=groupname][,mode=octalmode]\n" 1899 " configure a network backend to connect to port 'n' of a vde switch\n" 1900 " running on host and listening for incoming connections on 'socketpath'.\n" 1901 " Use group 'groupname' and mode 'octalmode' to change default\n" 1902 " ownership and permissions for communication port.\n" 1903#endif 1904#ifdef CONFIG_NETMAP 1905 "-netdev netmap,id=str,ifname=name[,devname=nmname]\n" 1906 " attach to the existing netmap-enabled network interface 'name', or to a\n" 1907 " VALE port (created on the fly) called 'name' ('nmname' is name of the \n" 1908 " netmap device, defaults to '/dev/netmap')\n" 1909#endif 1910#ifdef CONFIG_POSIX 1911 "-netdev vhost-user,id=str,chardev=dev[,vhostforce=on|off]\n" 1912 " configure a vhost-user network, backed by a chardev 'dev'\n" 1913#endif 1914 "-netdev hubport,id=str,hubid=n[,netdev=nd]\n" 1915 " configure a hub port on the hub with ID 'n'\n", QEMU_ARCH_ALL) 1916DEF("nic", HAS_ARG, QEMU_OPTION_nic, 1917 "-nic [tap|bridge|" 1918#ifdef CONFIG_SLIRP 1919 "user|" 1920#endif 1921#ifdef __linux__ 1922 "l2tpv3|" 1923#endif 1924#ifdef CONFIG_VDE 1925 "vde|" 1926#endif 1927#ifdef CONFIG_NETMAP 1928 "netmap|" 1929#endif 1930#ifdef CONFIG_POSIX 1931 "vhost-user|" 1932#endif 1933 "socket][,option][,...][mac=macaddr]\n" 1934 " initialize an on-board / default host NIC (using MAC address\n" 1935 " macaddr) and connect it to the given host network backend\n" 1936 "-nic none use it alone to have zero network devices (the default is to\n" 1937 " provided a 'user' network connection)\n", 1938 QEMU_ARCH_ALL) 1939DEF("net", HAS_ARG, QEMU_OPTION_net, 1940 "-net nic[,macaddr=mac][,model=type][,name=str][,addr=str][,vectors=v]\n" 1941 " configure or create an on-board (or machine default) NIC and\n" 1942 " connect it to hub 0 (please use -nic unless you need a hub)\n" 1943 "-net [" 1944#ifdef CONFIG_SLIRP 1945 "user|" 1946#endif 1947 "tap|" 1948 "bridge|" 1949#ifdef CONFIG_VDE 1950 "vde|" 1951#endif 1952#ifdef CONFIG_NETMAP 1953 "netmap|" 1954#endif 1955 "socket][,option][,option][,...]\n" 1956 " old way to initialize a host network interface\n" 1957 " (use the -netdev option if possible instead)\n", QEMU_ARCH_ALL) 1958STEXI 1959@item -nic [tap|bridge|user|l2tpv3|vde|netmap|vhost-user|socket][,...][,mac=macaddr][,model=mn] 1960@findex -nic 1961This option is a shortcut for configuring both the on-board (default) guest 1962NIC hardware and the host network backend in one go. The host backend options 1963are the same as with the corresponding @option{-netdev} options below. 1964The guest NIC model can be set with @option{model=@var{modelname}}. 1965Use @option{model=help} to list the available device types. 1966The hardware MAC address can be set with @option{mac=@var{macaddr}}. 1967 1968The following two example do exactly the same, to show how @option{-nic} can 1969be used to shorten the command line length (note that the e1000 is the default 1970on i386, so the @option{model=e1000} parameter could even be omitted here, too): 1971@example 1972qemu-system-i386 -netdev user,id=n1,ipv6=off -device e1000,netdev=n1,mac=52:54:98:76:54:32 1973qemu-system-i386 -nic user,ipv6=off,model=e1000,mac=52:54:98:76:54:32 1974@end example 1975 1976@item -nic none 1977Indicate that no network devices should be configured. It is used to override 1978the default configuration (default NIC with ``user'' host network backend) 1979which is activated if no other networking options are provided. 1980 1981@item -netdev user,id=@var{id}[,@var{option}][,@var{option}][,...] 1982@findex -netdev 1983Configure user mode host network backend which requires no administrator 1984privilege to run. Valid options are: 1985 1986@table @option 1987@item id=@var{id} 1988Assign symbolic name for use in monitor commands. 1989 1990@item ipv4=on|off and ipv6=on|off 1991Specify that either IPv4 or IPv6 must be enabled. If neither is specified 1992both protocols are enabled. 1993 1994@item net=@var{addr}[/@var{mask}] 1995Set IP network address the guest will see. Optionally specify the netmask, 1996either in the form a.b.c.d or as number of valid top-most bits. Default is 199710.0.2.0/24. 1998 1999@item host=@var{addr} 2000Specify the guest-visible address of the host. Default is the 2nd IP in the 2001guest network, i.e. x.x.x.2. 2002 2003@item ipv6-net=@var{addr}[/@var{int}] 2004Set IPv6 network address the guest will see (default is fec0::/64). The 2005network prefix is given in the usual hexadecimal IPv6 address 2006notation. The prefix size is optional, and is given as the number of 2007valid top-most bits (default is 64). 2008 2009@item ipv6-host=@var{addr} 2010Specify the guest-visible IPv6 address of the host. Default is the 2nd IPv6 in 2011the guest network, i.e. xxxx::2. 2012 2013@item restrict=on|off 2014If this option is enabled, the guest will be isolated, i.e. it will not be 2015able to contact the host and no guest IP packets will be routed over the host 2016to the outside. This option does not affect any explicitly set forwarding rules. 2017 2018@item hostname=@var{name} 2019Specifies the client hostname reported by the built-in DHCP server. 2020 2021@item dhcpstart=@var{addr} 2022Specify the first of the 16 IPs the built-in DHCP server can assign. Default 2023is the 15th to 31st IP in the guest network, i.e. x.x.x.15 to x.x.x.31. 2024 2025@item dns=@var{addr} 2026Specify the guest-visible address of the virtual nameserver. The address must 2027be different from the host address. Default is the 3rd IP in the guest network, 2028i.e. x.x.x.3. 2029 2030@item ipv6-dns=@var{addr} 2031Specify the guest-visible address of the IPv6 virtual nameserver. The address 2032must be different from the host address. Default is the 3rd IP in the guest 2033network, i.e. xxxx::3. 2034 2035@item dnssearch=@var{domain} 2036Provides an entry for the domain-search list sent by the built-in 2037DHCP server. More than one domain suffix can be transmitted by specifying 2038this option multiple times. If supported, this will cause the guest to 2039automatically try to append the given domain suffix(es) in case a domain name 2040can not be resolved. 2041 2042Example: 2043@example 2044qemu-system-i386 -nic user,dnssearch=mgmt.example.org,dnssearch=example.org 2045@end example 2046 2047@item domainname=@var{domain} 2048Specifies the client domain name reported by the built-in DHCP server. 2049 2050@item tftp=@var{dir} 2051When using the user mode network stack, activate a built-in TFTP 2052server. The files in @var{dir} will be exposed as the root of a TFTP server. 2053The TFTP client on the guest must be configured in binary mode (use the command 2054@code{bin} of the Unix TFTP client). 2055 2056@item tftp-server-name=@var{name} 2057In BOOTP reply, broadcast @var{name} as the "TFTP server name" (RFC2132 option 205866). This can be used to advise the guest to load boot files or configurations 2059from a different server than the host address. 2060 2061@item bootfile=@var{file} 2062When using the user mode network stack, broadcast @var{file} as the BOOTP 2063filename. In conjunction with @option{tftp}, this can be used to network boot 2064a guest from a local directory. 2065 2066Example (using pxelinux): 2067@example 2068qemu-system-i386 -hda linux.img -boot n -device e1000,netdev=n1 \ 2069 -netdev user,id=n1,tftp=/path/to/tftp/files,bootfile=/pxelinux.0 2070@end example 2071 2072@item smb=@var{dir}[,smbserver=@var{addr}] 2073When using the user mode network stack, activate a built-in SMB 2074server so that Windows OSes can access to the host files in @file{@var{dir}} 2075transparently. The IP address of the SMB server can be set to @var{addr}. By 2076default the 4th IP in the guest network is used, i.e. x.x.x.4. 2077 2078In the guest Windows OS, the line: 2079@example 208010.0.2.4 smbserver 2081@end example 2082must be added in the file @file{C:\WINDOWS\LMHOSTS} (for windows 9x/Me) 2083or @file{C:\WINNT\SYSTEM32\DRIVERS\ETC\LMHOSTS} (Windows NT/2000). 2084 2085Then @file{@var{dir}} can be accessed in @file{\\smbserver\qemu}. 2086 2087Note that a SAMBA server must be installed on the host OS. 2088 2089@item hostfwd=[tcp|udp]:[@var{hostaddr}]:@var{hostport}-[@var{guestaddr}]:@var{guestport} 2090Redirect incoming TCP or UDP connections to the host port @var{hostport} to 2091the guest IP address @var{guestaddr} on guest port @var{guestport}. If 2092@var{guestaddr} is not specified, its value is x.x.x.15 (default first address 2093given by the built-in DHCP server). By specifying @var{hostaddr}, the rule can 2094be bound to a specific host interface. If no connection type is set, TCP is 2095used. This option can be given multiple times. 2096 2097For example, to redirect host X11 connection from screen 1 to guest 2098screen 0, use the following: 2099 2100@example 2101# on the host 2102qemu-system-i386 -nic user,hostfwd=tcp:127.0.0.1:6001-:6000 2103# this host xterm should open in the guest X11 server 2104xterm -display :1 2105@end example 2106 2107To redirect telnet connections from host port 5555 to telnet port on 2108the guest, use the following: 2109 2110@example 2111# on the host 2112qemu-system-i386 -nic user,hostfwd=tcp::5555-:23 2113telnet localhost 5555 2114@end example 2115 2116Then when you use on the host @code{telnet localhost 5555}, you 2117connect to the guest telnet server. 2118 2119@item guestfwd=[tcp]:@var{server}:@var{port}-@var{dev} 2120@itemx guestfwd=[tcp]:@var{server}:@var{port}-@var{cmd:command} 2121Forward guest TCP connections to the IP address @var{server} on port @var{port} 2122to the character device @var{dev} or to a program executed by @var{cmd:command} 2123which gets spawned for each connection. This option can be given multiple times. 2124 2125You can either use a chardev directly and have that one used throughout QEMU's 2126lifetime, like in the following example: 2127 2128@example 2129# open 10.10.1.1:4321 on bootup, connect 10.0.2.100:1234 to it whenever 2130# the guest accesses it 2131qemu-system-i386 -nic user,guestfwd=tcp:10.0.2.100:1234-tcp:10.10.1.1:4321 2132@end example 2133 2134Or you can execute a command on every TCP connection established by the guest, 2135so that QEMU behaves similar to an inetd process for that virtual server: 2136 2137@example 2138# call "netcat 10.10.1.1 4321" on every TCP connection to 10.0.2.100:1234 2139# and connect the TCP stream to its stdin/stdout 2140qemu-system-i386 -nic 'user,id=n1,guestfwd=tcp:10.0.2.100:1234-cmd:netcat 10.10.1.1 4321' 2141@end example 2142 2143@end table 2144 2145@item -netdev tap,id=@var{id}[,fd=@var{h}][,ifname=@var{name}][,script=@var{file}][,downscript=@var{dfile}][,br=@var{bridge}][,helper=@var{helper}] 2146Configure a host TAP network backend with ID @var{id}. 2147 2148Use the network script @var{file} to configure it and the network script 2149@var{dfile} to deconfigure it. If @var{name} is not provided, the OS 2150automatically provides one. The default network configure script is 2151@file{/etc/qemu-ifup} and the default network deconfigure script is 2152@file{/etc/qemu-ifdown}. Use @option{script=no} or @option{downscript=no} 2153to disable script execution. 2154 2155If running QEMU as an unprivileged user, use the network helper 2156@var{helper} to configure the TAP interface and attach it to the bridge. 2157The default network helper executable is @file{/path/to/qemu-bridge-helper} 2158and the default bridge device is @file{br0}. 2159 2160@option{fd}=@var{h} can be used to specify the handle of an already 2161opened host TAP interface. 2162 2163Examples: 2164 2165@example 2166#launch a QEMU instance with the default network script 2167qemu-system-i386 linux.img -nic tap 2168@end example 2169 2170@example 2171#launch a QEMU instance with two NICs, each one connected 2172#to a TAP device 2173qemu-system-i386 linux.img \ 2174 -netdev tap,id=nd0,ifname=tap0 -device e1000,netdev=nd0 \ 2175 -netdev tap,id=nd1,ifname=tap1 -device rtl8139,netdev=nd1 2176@end example 2177 2178@example 2179#launch a QEMU instance with the default network helper to 2180#connect a TAP device to bridge br0 2181qemu-system-i386 linux.img -device virtio-net-pci,netdev=n1 \ 2182 -netdev tap,id=n1,"helper=/path/to/qemu-bridge-helper" 2183@end example 2184 2185@item -netdev bridge,id=@var{id}[,br=@var{bridge}][,helper=@var{helper}] 2186Connect a host TAP network interface to a host bridge device. 2187 2188Use the network helper @var{helper} to configure the TAP interface and 2189attach it to the bridge. The default network helper executable is 2190@file{/path/to/qemu-bridge-helper} and the default bridge 2191device is @file{br0}. 2192 2193Examples: 2194 2195@example 2196#launch a QEMU instance with the default network helper to 2197#connect a TAP device to bridge br0 2198qemu-system-i386 linux.img -netdev bridge,id=n1 -device virtio-net,netdev=n1 2199@end example 2200 2201@example 2202#launch a QEMU instance with the default network helper to 2203#connect a TAP device to bridge qemubr0 2204qemu-system-i386 linux.img -netdev bridge,br=qemubr0,id=n1 -device virtio-net,netdev=n1 2205@end example 2206 2207@item -netdev socket,id=@var{id}[,fd=@var{h}][,listen=[@var{host}]:@var{port}][,connect=@var{host}:@var{port}] 2208 2209This host network backend can be used to connect the guest's network to 2210another QEMU virtual machine using a TCP socket connection. If @option{listen} 2211is specified, QEMU waits for incoming connections on @var{port} 2212(@var{host} is optional). @option{connect} is used to connect to 2213another QEMU instance using the @option{listen} option. @option{fd}=@var{h} 2214specifies an already opened TCP socket. 2215 2216Example: 2217@example 2218# launch a first QEMU instance 2219qemu-system-i386 linux.img \ 2220 -device e1000,netdev=n1,mac=52:54:00:12:34:56 \ 2221 -netdev socket,id=n1,listen=:1234 2222# connect the network of this instance to the network of the first instance 2223qemu-system-i386 linux.img \ 2224 -device e1000,netdev=n2,mac=52:54:00:12:34:57 \ 2225 -netdev socket,id=n2,connect=127.0.0.1:1234 2226@end example 2227 2228@item -netdev socket,id=@var{id}[,fd=@var{h}][,mcast=@var{maddr}:@var{port}[,localaddr=@var{addr}]] 2229 2230Configure a socket host network backend to share the guest's network traffic 2231with another QEMU virtual machines using a UDP multicast socket, effectively 2232making a bus for every QEMU with same multicast address @var{maddr} and @var{port}. 2233NOTES: 2234@enumerate 2235@item 2236Several QEMU can be running on different hosts and share same bus (assuming 2237correct multicast setup for these hosts). 2238@item 2239mcast support is compatible with User Mode Linux (argument @option{eth@var{N}=mcast}), see 2240@url{http://user-mode-linux.sf.net}. 2241@item 2242Use @option{fd=h} to specify an already opened UDP multicast socket. 2243@end enumerate 2244 2245Example: 2246@example 2247# launch one QEMU instance 2248qemu-system-i386 linux.img \ 2249 -device e1000,netdev=n1,mac=52:54:00:12:34:56 \ 2250 -netdev socket,id=n1,mcast=230.0.0.1:1234 2251# launch another QEMU instance on same "bus" 2252qemu-system-i386 linux.img \ 2253 -device e1000,netdev=n2,mac=52:54:00:12:34:57 \ 2254 -netdev socket,id=n2,mcast=230.0.0.1:1234 2255# launch yet another QEMU instance on same "bus" 2256qemu-system-i386 linux.img \ 2257 -device e1000,netdev=n3,mac=52:54:00:12:34:58 \ 2258 -netdev socket,id=n3,mcast=230.0.0.1:1234 2259@end example 2260 2261Example (User Mode Linux compat.): 2262@example 2263# launch QEMU instance (note mcast address selected is UML's default) 2264qemu-system-i386 linux.img \ 2265 -device e1000,netdev=n1,mac=52:54:00:12:34:56 \ 2266 -netdev socket,id=n1,mcast=239.192.168.1:1102 2267# launch UML 2268/path/to/linux ubd0=/path/to/root_fs eth0=mcast 2269@end example 2270 2271Example (send packets from host's 1.2.3.4): 2272@example 2273qemu-system-i386 linux.img \ 2274 -device e1000,netdev=n1,mac=52:54:00:12:34:56 \ 2275 -netdev socket,id=n1,mcast=239.192.168.1:1102,localaddr=1.2.3.4 2276@end example 2277 2278@item -netdev l2tpv3,id=@var{id},src=@var{srcaddr},dst=@var{dstaddr}[,srcport=@var{srcport}][,dstport=@var{dstport}],txsession=@var{txsession}[,rxsession=@var{rxsession}][,ipv6][,udp][,cookie64][,counter][,pincounter][,txcookie=@var{txcookie}][,rxcookie=@var{rxcookie}][,offset=@var{offset}] 2279Configure a L2TPv3 pseudowire host network backend. L2TPv3 (RFC3391) is a 2280popular protocol to transport Ethernet (and other Layer 2) data frames between 2281two systems. It is present in routers, firewalls and the Linux kernel 2282(from version 3.3 onwards). 2283 2284This transport allows a VM to communicate to another VM, router or firewall directly. 2285 2286@table @option 2287@item src=@var{srcaddr} 2288 source address (mandatory) 2289@item dst=@var{dstaddr} 2290 destination address (mandatory) 2291@item udp 2292 select udp encapsulation (default is ip). 2293@item srcport=@var{srcport} 2294 source udp port. 2295@item dstport=@var{dstport} 2296 destination udp port. 2297@item ipv6 2298 force v6, otherwise defaults to v4. 2299@item rxcookie=@var{rxcookie} 2300@itemx txcookie=@var{txcookie} 2301 Cookies are a weak form of security in the l2tpv3 specification. 2302Their function is mostly to prevent misconfiguration. By default they are 32 2303bit. 2304@item cookie64 2305 Set cookie size to 64 bit instead of the default 32 2306@item counter=off 2307 Force a 'cut-down' L2TPv3 with no counter as in 2308draft-mkonstan-l2tpext-keyed-ipv6-tunnel-00 2309@item pincounter=on 2310 Work around broken counter handling in peer. This may also help on 2311networks which have packet reorder. 2312@item offset=@var{offset} 2313 Add an extra offset between header and data 2314@end table 2315 2316For example, to attach a VM running on host 4.3.2.1 via L2TPv3 to the bridge br-lan 2317on the remote Linux host 1.2.3.4: 2318@example 2319# Setup tunnel on linux host using raw ip as encapsulation 2320# on 1.2.3.4 2321ip l2tp add tunnel remote 4.3.2.1 local 1.2.3.4 tunnel_id 1 peer_tunnel_id 1 \ 2322 encap udp udp_sport 16384 udp_dport 16384 2323ip l2tp add session tunnel_id 1 name vmtunnel0 session_id \ 2324 0xFFFFFFFF peer_session_id 0xFFFFFFFF 2325ifconfig vmtunnel0 mtu 1500 2326ifconfig vmtunnel0 up 2327brctl addif br-lan vmtunnel0 2328 2329 2330# on 4.3.2.1 2331# launch QEMU instance - if your network has reorder or is very lossy add ,pincounter 2332 2333qemu-system-i386 linux.img -device e1000,netdev=n1 \ 2334 -netdev l2tpv3,id=n1,src=4.2.3.1,dst=1.2.3.4,udp,srcport=16384,dstport=16384,rxsession=0xffffffff,txsession=0xffffffff,counter 2335 2336@end example 2337 2338@item -netdev vde,id=@var{id}[,sock=@var{socketpath}][,port=@var{n}][,group=@var{groupname}][,mode=@var{octalmode}] 2339Configure VDE backend to connect to PORT @var{n} of a vde switch running on host and 2340listening for incoming connections on @var{socketpath}. Use GROUP @var{groupname} 2341and MODE @var{octalmode} to change default ownership and permissions for 2342communication port. This option is only available if QEMU has been compiled 2343with vde support enabled. 2344 2345Example: 2346@example 2347# launch vde switch 2348vde_switch -F -sock /tmp/myswitch 2349# launch QEMU instance 2350qemu-system-i386 linux.img -nic vde,sock=/tmp/myswitch 2351@end example 2352 2353@item -netdev vhost-user,chardev=@var{id}[,vhostforce=on|off][,queues=n] 2354 2355Establish a vhost-user netdev, backed by a chardev @var{id}. The chardev should 2356be a unix domain socket backed one. The vhost-user uses a specifically defined 2357protocol to pass vhost ioctl replacement messages to an application on the other 2358end of the socket. On non-MSIX guests, the feature can be forced with 2359@var{vhostforce}. Use 'queues=@var{n}' to specify the number of queues to 2360be created for multiqueue vhost-user. 2361 2362Example: 2363@example 2364qemu -m 512 -object memory-backend-file,id=mem,size=512M,mem-path=/hugetlbfs,share=on \ 2365 -numa node,memdev=mem \ 2366 -chardev socket,id=chr0,path=/path/to/socket \ 2367 -netdev type=vhost-user,id=net0,chardev=chr0 \ 2368 -device virtio-net-pci,netdev=net0 2369@end example 2370 2371@item -netdev hubport,id=@var{id},hubid=@var{hubid}[,netdev=@var{nd}] 2372 2373Create a hub port on the emulated hub with ID @var{hubid}. 2374 2375The hubport netdev lets you connect a NIC to a QEMU emulated hub instead of a 2376single netdev. Alternatively, you can also connect the hubport to another 2377netdev with ID @var{nd} by using the @option{netdev=@var{nd}} option. 2378 2379@item -net nic[,netdev=@var{nd}][,macaddr=@var{mac}][,model=@var{type}] [,name=@var{name}][,addr=@var{addr}][,vectors=@var{v}] 2380@findex -net 2381Legacy option to configure or create an on-board (or machine default) Network 2382Interface Card(NIC) and connect it either to the emulated hub with ID 0 (i.e. 2383the default hub), or to the netdev @var{nd}. 2384The NIC is an e1000 by default on the PC target. Optionally, the MAC address 2385can be changed to @var{mac}, the device address set to @var{addr} (PCI cards 2386only), and a @var{name} can be assigned for use in monitor commands. 2387Optionally, for PCI cards, you can specify the number @var{v} of MSI-X vectors 2388that the card should have; this option currently only affects virtio cards; set 2389@var{v} = 0 to disable MSI-X. If no @option{-net} option is specified, a single 2390NIC is created. QEMU can emulate several different models of network card. 2391Use @code{-net nic,model=help} for a list of available devices for your target. 2392 2393@item -net user|tap|bridge|socket|l2tpv3|vde[,...][,name=@var{name}] 2394Configure a host network backend (with the options corresponding to the same 2395@option{-netdev} option) and connect it to the emulated hub 0 (the default 2396hub). Use @var{name} to specify the name of the hub port. 2397ETEXI 2398 2399STEXI 2400@end table 2401ETEXI 2402DEFHEADING() 2403 2404DEFHEADING(Character device options:) 2405 2406DEF("chardev", HAS_ARG, QEMU_OPTION_chardev, 2407 "-chardev help\n" 2408 "-chardev null,id=id[,mux=on|off][,logfile=PATH][,logappend=on|off]\n" 2409 "-chardev socket,id=id[,host=host],port=port[,to=to][,ipv4][,ipv6][,nodelay][,reconnect=seconds]\n" 2410 " [,server][,nowait][,telnet][,websocket][,reconnect=seconds][,mux=on|off]\n" 2411 " [,logfile=PATH][,logappend=on|off][,tls-creds=ID] (tcp)\n" 2412 "-chardev socket,id=id,path=path[,server][,nowait][,telnet][,websocket][,reconnect=seconds]\n" 2413 " [,mux=on|off][,logfile=PATH][,logappend=on|off] (unix)\n" 2414 "-chardev udp,id=id[,host=host],port=port[,localaddr=localaddr]\n" 2415 " [,localport=localport][,ipv4][,ipv6][,mux=on|off]\n" 2416 " [,logfile=PATH][,logappend=on|off]\n" 2417 "-chardev msmouse,id=id[,mux=on|off][,logfile=PATH][,logappend=on|off]\n" 2418 "-chardev vc,id=id[[,width=width][,height=height]][[,cols=cols][,rows=rows]]\n" 2419 " [,mux=on|off][,logfile=PATH][,logappend=on|off]\n" 2420 "-chardev ringbuf,id=id[,size=size][,logfile=PATH][,logappend=on|off]\n" 2421 "-chardev file,id=id,path=path[,mux=on|off][,logfile=PATH][,logappend=on|off]\n" 2422 "-chardev pipe,id=id,path=path[,mux=on|off][,logfile=PATH][,logappend=on|off]\n" 2423#ifdef _WIN32 2424 "-chardev console,id=id[,mux=on|off][,logfile=PATH][,logappend=on|off]\n" 2425 "-chardev serial,id=id,path=path[,mux=on|off][,logfile=PATH][,logappend=on|off]\n" 2426#else 2427 "-chardev pty,id=id[,mux=on|off][,logfile=PATH][,logappend=on|off]\n" 2428 "-chardev stdio,id=id[,mux=on|off][,signal=on|off][,logfile=PATH][,logappend=on|off]\n" 2429#endif 2430#ifdef CONFIG_BRLAPI 2431 "-chardev braille,id=id[,mux=on|off][,logfile=PATH][,logappend=on|off]\n" 2432#endif 2433#if defined(__linux__) || defined(__sun__) || defined(__FreeBSD__) \ 2434 || defined(__NetBSD__) || defined(__OpenBSD__) || defined(__DragonFly__) 2435 "-chardev serial,id=id,path=path[,mux=on|off][,logfile=PATH][,logappend=on|off]\n" 2436 "-chardev tty,id=id,path=path[,mux=on|off][,logfile=PATH][,logappend=on|off]\n" 2437#endif 2438#if defined(__linux__) || defined(__FreeBSD__) || defined(__DragonFly__) 2439 "-chardev parallel,id=id,path=path[,mux=on|off][,logfile=PATH][,logappend=on|off]\n" 2440 "-chardev parport,id=id,path=path[,mux=on|off][,logfile=PATH][,logappend=on|off]\n" 2441#endif 2442#if defined(CONFIG_SPICE) 2443 "-chardev spicevmc,id=id,name=name[,debug=debug][,logfile=PATH][,logappend=on|off]\n" 2444 "-chardev spiceport,id=id,name=name[,debug=debug][,logfile=PATH][,logappend=on|off]\n" 2445#endif 2446 , QEMU_ARCH_ALL 2447) 2448 2449STEXI 2450 2451The general form of a character device option is: 2452@table @option 2453@item -chardev @var{backend},id=@var{id}[,mux=on|off][,@var{options}] 2454@findex -chardev 2455Backend is one of: 2456@option{null}, 2457@option{socket}, 2458@option{udp}, 2459@option{msmouse}, 2460@option{vc}, 2461@option{ringbuf}, 2462@option{file}, 2463@option{pipe}, 2464@option{console}, 2465@option{serial}, 2466@option{pty}, 2467@option{stdio}, 2468@option{braille}, 2469@option{tty}, 2470@option{parallel}, 2471@option{parport}, 2472@option{spicevmc}, 2473@option{spiceport}. 2474The specific backend will determine the applicable options. 2475 2476Use @code{-chardev help} to print all available chardev backend types. 2477 2478All devices must have an id, which can be any string up to 127 characters long. 2479It is used to uniquely identify this device in other command line directives. 2480 2481A character device may be used in multiplexing mode by multiple front-ends. 2482Specify @option{mux=on} to enable this mode. 2483A multiplexer is a "1:N" device, and here the "1" end is your specified chardev 2484backend, and the "N" end is the various parts of QEMU that can talk to a chardev. 2485If you create a chardev with @option{id=myid} and @option{mux=on}, QEMU will 2486create a multiplexer with your specified ID, and you can then configure multiple 2487front ends to use that chardev ID for their input/output. Up to four different 2488front ends can be connected to a single multiplexed chardev. (Without 2489multiplexing enabled, a chardev can only be used by a single front end.) 2490For instance you could use this to allow a single stdio chardev to be used by 2491two serial ports and the QEMU monitor: 2492 2493@example 2494-chardev stdio,mux=on,id=char0 \ 2495-mon chardev=char0,mode=readline \ 2496-serial chardev:char0 \ 2497-serial chardev:char0 2498@end example 2499 2500You can have more than one multiplexer in a system configuration; for instance 2501you could have a TCP port multiplexed between UART 0 and UART 1, and stdio 2502multiplexed between the QEMU monitor and a parallel port: 2503 2504@example 2505-chardev stdio,mux=on,id=char0 \ 2506-mon chardev=char0,mode=readline \ 2507-parallel chardev:char0 \ 2508-chardev tcp,...,mux=on,id=char1 \ 2509-serial chardev:char1 \ 2510-serial chardev:char1 2511@end example 2512 2513When you're using a multiplexed character device, some escape sequences are 2514interpreted in the input. @xref{mux_keys, Keys in the character backend 2515multiplexer}. 2516 2517Note that some other command line options may implicitly create multiplexed 2518character backends; for instance @option{-serial mon:stdio} creates a 2519multiplexed stdio backend connected to the serial port and the QEMU monitor, 2520and @option{-nographic} also multiplexes the console and the monitor to 2521stdio. 2522 2523There is currently no support for multiplexing in the other direction 2524(where a single QEMU front end takes input and output from multiple chardevs). 2525 2526Every backend supports the @option{logfile} option, which supplies the path 2527to a file to record all data transmitted via the backend. The @option{logappend} 2528option controls whether the log file will be truncated or appended to when 2529opened. 2530 2531@end table 2532 2533The available backends are: 2534 2535@table @option 2536@item -chardev null,id=@var{id} 2537A void device. This device will not emit any data, and will drop any data it 2538receives. The null backend does not take any options. 2539 2540@item -chardev socket,id=@var{id}[,@var{TCP options} or @var{unix options}][,server][,nowait][,telnet][,websocket][,reconnect=@var{seconds}][,tls-creds=@var{id}] 2541 2542Create a two-way stream socket, which can be either a TCP or a unix socket. A 2543unix socket will be created if @option{path} is specified. Behaviour is 2544undefined if TCP options are specified for a unix socket. 2545 2546@option{server} specifies that the socket shall be a listening socket. 2547 2548@option{nowait} specifies that QEMU should not block waiting for a client to 2549connect to a listening socket. 2550 2551@option{telnet} specifies that traffic on the socket should interpret telnet 2552escape sequences. 2553 2554@option{websocket} specifies that the socket uses WebSocket protocol for 2555communication. 2556 2557@option{reconnect} sets the timeout for reconnecting on non-server sockets when 2558the remote end goes away. qemu will delay this many seconds and then attempt 2559to reconnect. Zero disables reconnecting, and is the default. 2560 2561@option{tls-creds} requests enablement of the TLS protocol for encryption, 2562and specifies the id of the TLS credentials to use for the handshake. The 2563credentials must be previously created with the @option{-object tls-creds} 2564argument. 2565 2566TCP and unix socket options are given below: 2567 2568@table @option 2569 2570@item TCP options: port=@var{port}[,host=@var{host}][,to=@var{to}][,ipv4][,ipv6][,nodelay] 2571 2572@option{host} for a listening socket specifies the local address to be bound. 2573For a connecting socket species the remote host to connect to. @option{host} is 2574optional for listening sockets. If not specified it defaults to @code{0.0.0.0}. 2575 2576@option{port} for a listening socket specifies the local port to be bound. For a 2577connecting socket specifies the port on the remote host to connect to. 2578@option{port} can be given as either a port number or a service name. 2579@option{port} is required. 2580 2581@option{to} is only relevant to listening sockets. If it is specified, and 2582@option{port} cannot be bound, QEMU will attempt to bind to subsequent ports up 2583to and including @option{to} until it succeeds. @option{to} must be specified 2584as a port number. 2585 2586@option{ipv4} and @option{ipv6} specify that either IPv4 or IPv6 must be used. 2587If neither is specified the socket may use either protocol. 2588 2589@option{nodelay} disables the Nagle algorithm. 2590 2591@item unix options: path=@var{path} 2592 2593@option{path} specifies the local path of the unix socket. @option{path} is 2594required. 2595 2596@end table 2597 2598@item -chardev udp,id=@var{id}[,host=@var{host}],port=@var{port}[,localaddr=@var{localaddr}][,localport=@var{localport}][,ipv4][,ipv6] 2599 2600Sends all traffic from the guest to a remote host over UDP. 2601 2602@option{host} specifies the remote host to connect to. If not specified it 2603defaults to @code{localhost}. 2604 2605@option{port} specifies the port on the remote host to connect to. @option{port} 2606is required. 2607 2608@option{localaddr} specifies the local address to bind to. If not specified it 2609defaults to @code{0.0.0.0}. 2610 2611@option{localport} specifies the local port to bind to. If not specified any 2612available local port will be used. 2613 2614@option{ipv4} and @option{ipv6} specify that either IPv4 or IPv6 must be used. 2615If neither is specified the device may use either protocol. 2616 2617@item -chardev msmouse,id=@var{id} 2618 2619Forward QEMU's emulated msmouse events to the guest. @option{msmouse} does not 2620take any options. 2621 2622@item -chardev vc,id=@var{id}[[,width=@var{width}][,height=@var{height}]][[,cols=@var{cols}][,rows=@var{rows}]] 2623 2624Connect to a QEMU text console. @option{vc} may optionally be given a specific 2625size. 2626 2627@option{width} and @option{height} specify the width and height respectively of 2628the console, in pixels. 2629 2630@option{cols} and @option{rows} specify that the console be sized to fit a text 2631console with the given dimensions. 2632 2633@item -chardev ringbuf,id=@var{id}[,size=@var{size}] 2634 2635Create a ring buffer with fixed size @option{size}. 2636@var{size} must be a power of two and defaults to @code{64K}. 2637 2638@item -chardev file,id=@var{id},path=@var{path} 2639 2640Log all traffic received from the guest to a file. 2641 2642@option{path} specifies the path of the file to be opened. This file will be 2643created if it does not already exist, and overwritten if it does. @option{path} 2644is required. 2645 2646@item -chardev pipe,id=@var{id},path=@var{path} 2647 2648Create a two-way connection to the guest. The behaviour differs slightly between 2649Windows hosts and other hosts: 2650 2651On Windows, a single duplex pipe will be created at 2652@file{\\.pipe\@option{path}}. 2653 2654On other hosts, 2 pipes will be created called @file{@option{path}.in} and 2655@file{@option{path}.out}. Data written to @file{@option{path}.in} will be 2656received by the guest. Data written by the guest can be read from 2657@file{@option{path}.out}. QEMU will not create these fifos, and requires them to 2658be present. 2659 2660@option{path} forms part of the pipe path as described above. @option{path} is 2661required. 2662 2663@item -chardev console,id=@var{id} 2664 2665Send traffic from the guest to QEMU's standard output. @option{console} does not 2666take any options. 2667 2668@option{console} is only available on Windows hosts. 2669 2670@item -chardev serial,id=@var{id},path=@option{path} 2671 2672Send traffic from the guest to a serial device on the host. 2673 2674On Unix hosts serial will actually accept any tty device, 2675not only serial lines. 2676 2677@option{path} specifies the name of the serial device to open. 2678 2679@item -chardev pty,id=@var{id} 2680 2681Create a new pseudo-terminal on the host and connect to it. @option{pty} does 2682not take any options. 2683 2684@option{pty} is not available on Windows hosts. 2685 2686@item -chardev stdio,id=@var{id}[,signal=on|off] 2687Connect to standard input and standard output of the QEMU process. 2688 2689@option{signal} controls if signals are enabled on the terminal, that includes 2690exiting QEMU with the key sequence @key{Control-c}. This option is enabled by 2691default, use @option{signal=off} to disable it. 2692 2693@item -chardev braille,id=@var{id} 2694 2695Connect to a local BrlAPI server. @option{braille} does not take any options. 2696 2697@item -chardev tty,id=@var{id},path=@var{path} 2698 2699@option{tty} is only available on Linux, Sun, FreeBSD, NetBSD, OpenBSD and 2700DragonFlyBSD hosts. It is an alias for @option{serial}. 2701 2702@option{path} specifies the path to the tty. @option{path} is required. 2703 2704@item -chardev parallel,id=@var{id},path=@var{path} 2705@itemx -chardev parport,id=@var{id},path=@var{path} 2706 2707@option{parallel} is only available on Linux, FreeBSD and DragonFlyBSD hosts. 2708 2709Connect to a local parallel port. 2710 2711@option{path} specifies the path to the parallel port device. @option{path} is 2712required. 2713 2714@item -chardev spicevmc,id=@var{id},debug=@var{debug},name=@var{name} 2715 2716@option{spicevmc} is only available when spice support is built in. 2717 2718@option{debug} debug level for spicevmc 2719 2720@option{name} name of spice channel to connect to 2721 2722Connect to a spice virtual machine channel, such as vdiport. 2723 2724@item -chardev spiceport,id=@var{id},debug=@var{debug},name=@var{name} 2725 2726@option{spiceport} is only available when spice support is built in. 2727 2728@option{debug} debug level for spicevmc 2729 2730@option{name} name of spice port to connect to 2731 2732Connect to a spice port, allowing a Spice client to handle the traffic 2733identified by a name (preferably a fqdn). 2734ETEXI 2735 2736STEXI 2737@end table 2738ETEXI 2739DEFHEADING() 2740 2741DEFHEADING(Bluetooth(R) options:) 2742STEXI 2743@table @option 2744ETEXI 2745 2746DEF("bt", HAS_ARG, QEMU_OPTION_bt, \ 2747 "-bt hci,null dumb bluetooth HCI - doesn't respond to commands\n" \ 2748 "-bt hci,host[:id]\n" \ 2749 " use host's HCI with the given name\n" \ 2750 "-bt hci[,vlan=n]\n" \ 2751 " emulate a standard HCI in virtual scatternet 'n'\n" \ 2752 "-bt vhci[,vlan=n]\n" \ 2753 " add host computer to virtual scatternet 'n' using VHCI\n" \ 2754 "-bt device:dev[,vlan=n]\n" \ 2755 " emulate a bluetooth device 'dev' in scatternet 'n'\n", 2756 QEMU_ARCH_ALL) 2757STEXI 2758@item -bt hci[...] 2759@findex -bt 2760Defines the function of the corresponding Bluetooth HCI. -bt options 2761are matched with the HCIs present in the chosen machine type. For 2762example when emulating a machine with only one HCI built into it, only 2763the first @code{-bt hci[...]} option is valid and defines the HCI's 2764logic. The Transport Layer is decided by the machine type. Currently 2765the machines @code{n800} and @code{n810} have one HCI and all other 2766machines have none. 2767 2768Note: This option and the whole bluetooth subsystem is considered as deprecated. 2769If you still use it, please send a mail to @email{qemu-devel@@nongnu.org} where 2770you describe your usecase. 2771 2772@anchor{bt-hcis} 2773The following three types are recognized: 2774 2775@table @option 2776@item -bt hci,null 2777(default) The corresponding Bluetooth HCI assumes no internal logic 2778and will not respond to any HCI commands or emit events. 2779 2780@item -bt hci,host[:@var{id}] 2781(@code{bluez} only) The corresponding HCI passes commands / events 2782to / from the physical HCI identified by the name @var{id} (default: 2783@code{hci0}) on the computer running QEMU. Only available on @code{bluez} 2784capable systems like Linux. 2785 2786@item -bt hci[,vlan=@var{n}] 2787Add a virtual, standard HCI that will participate in the Bluetooth 2788scatternet @var{n} (default @code{0}). Similarly to @option{-net} 2789VLANs, devices inside a bluetooth network @var{n} can only communicate 2790with other devices in the same network (scatternet). 2791@end table 2792 2793@item -bt vhci[,vlan=@var{n}] 2794(Linux-host only) Create a HCI in scatternet @var{n} (default 0) attached 2795to the host bluetooth stack instead of to the emulated target. This 2796allows the host and target machines to participate in a common scatternet 2797and communicate. Requires the Linux @code{vhci} driver installed. Can 2798be used as following: 2799 2800@example 2801qemu-system-i386 [...OPTIONS...] -bt hci,vlan=5 -bt vhci,vlan=5 2802@end example 2803 2804@item -bt device:@var{dev}[,vlan=@var{n}] 2805Emulate a bluetooth device @var{dev} and place it in network @var{n} 2806(default @code{0}). QEMU can only emulate one type of bluetooth devices 2807currently: 2808 2809@table @option 2810@item keyboard 2811Virtual wireless keyboard implementing the HIDP bluetooth profile. 2812@end table 2813ETEXI 2814 2815STEXI 2816@end table 2817ETEXI 2818DEFHEADING() 2819 2820#ifdef CONFIG_TPM 2821DEFHEADING(TPM device options:) 2822 2823DEF("tpmdev", HAS_ARG, QEMU_OPTION_tpmdev, \ 2824 "-tpmdev passthrough,id=id[,path=path][,cancel-path=path]\n" 2825 " use path to provide path to a character device; default is /dev/tpm0\n" 2826 " use cancel-path to provide path to TPM's cancel sysfs entry; if\n" 2827 " not provided it will be searched for in /sys/class/misc/tpm?/device\n" 2828 "-tpmdev emulator,id=id,chardev=dev\n" 2829 " configure the TPM device using chardev backend\n", 2830 QEMU_ARCH_ALL) 2831STEXI 2832 2833The general form of a TPM device option is: 2834@table @option 2835 2836@item -tpmdev @var{backend},id=@var{id}[,@var{options}] 2837@findex -tpmdev 2838 2839The specific backend type will determine the applicable options. 2840The @code{-tpmdev} option creates the TPM backend and requires a 2841@code{-device} option that specifies the TPM frontend interface model. 2842 2843Use @code{-tpmdev help} to print all available TPM backend types. 2844 2845@end table 2846 2847The available backends are: 2848 2849@table @option 2850 2851@item -tpmdev passthrough,id=@var{id},path=@var{path},cancel-path=@var{cancel-path} 2852 2853(Linux-host only) Enable access to the host's TPM using the passthrough 2854driver. 2855 2856@option{path} specifies the path to the host's TPM device, i.e., on 2857a Linux host this would be @code{/dev/tpm0}. 2858@option{path} is optional and by default @code{/dev/tpm0} is used. 2859 2860@option{cancel-path} specifies the path to the host TPM device's sysfs 2861entry allowing for cancellation of an ongoing TPM command. 2862@option{cancel-path} is optional and by default QEMU will search for the 2863sysfs entry to use. 2864 2865Some notes about using the host's TPM with the passthrough driver: 2866 2867The TPM device accessed by the passthrough driver must not be 2868used by any other application on the host. 2869 2870Since the host's firmware (BIOS/UEFI) has already initialized the TPM, 2871the VM's firmware (BIOS/UEFI) will not be able to initialize the 2872TPM again and may therefore not show a TPM-specific menu that would 2873otherwise allow the user to configure the TPM, e.g., allow the user to 2874enable/disable or activate/deactivate the TPM. 2875Further, if TPM ownership is released from within a VM then the host's TPM 2876will get disabled and deactivated. To enable and activate the 2877TPM again afterwards, the host has to be rebooted and the user is 2878required to enter the firmware's menu to enable and activate the TPM. 2879If the TPM is left disabled and/or deactivated most TPM commands will fail. 2880 2881To create a passthrough TPM use the following two options: 2882@example 2883-tpmdev passthrough,id=tpm0 -device tpm-tis,tpmdev=tpm0 2884@end example 2885Note that the @code{-tpmdev} id is @code{tpm0} and is referenced by 2886@code{tpmdev=tpm0} in the device option. 2887 2888@item -tpmdev emulator,id=@var{id},chardev=@var{dev} 2889 2890(Linux-host only) Enable access to a TPM emulator using Unix domain socket based 2891chardev backend. 2892 2893@option{chardev} specifies the unique ID of a character device backend that provides connection to the software TPM server. 2894 2895To create a TPM emulator backend device with chardev socket backend: 2896@example 2897 2898-chardev socket,id=chrtpm,path=/tmp/swtpm-sock -tpmdev emulator,id=tpm0,chardev=chrtpm -device tpm-tis,tpmdev=tpm0 2899 2900@end example 2901 2902ETEXI 2903 2904STEXI 2905@end table 2906ETEXI 2907DEFHEADING() 2908 2909#endif 2910 2911DEFHEADING(Linux/Multiboot boot specific:) 2912STEXI 2913 2914When using these options, you can use a given Linux or Multiboot 2915kernel without installing it in the disk image. It can be useful 2916for easier testing of various kernels. 2917 2918@table @option 2919ETEXI 2920 2921DEF("kernel", HAS_ARG, QEMU_OPTION_kernel, \ 2922 "-kernel bzImage use 'bzImage' as kernel image\n", QEMU_ARCH_ALL) 2923STEXI 2924@item -kernel @var{bzImage} 2925@findex -kernel 2926Use @var{bzImage} as kernel image. The kernel can be either a Linux kernel 2927or in multiboot format. 2928ETEXI 2929 2930DEF("append", HAS_ARG, QEMU_OPTION_append, \ 2931 "-append cmdline use 'cmdline' as kernel command line\n", QEMU_ARCH_ALL) 2932STEXI 2933@item -append @var{cmdline} 2934@findex -append 2935Use @var{cmdline} as kernel command line 2936ETEXI 2937 2938DEF("initrd", HAS_ARG, QEMU_OPTION_initrd, \ 2939 "-initrd file use 'file' as initial ram disk\n", QEMU_ARCH_ALL) 2940STEXI 2941@item -initrd @var{file} 2942@findex -initrd 2943Use @var{file} as initial ram disk. 2944 2945@item -initrd "@var{file1} arg=foo,@var{file2}" 2946 2947This syntax is only available with multiboot. 2948 2949Use @var{file1} and @var{file2} as modules and pass arg=foo as parameter to the 2950first module. 2951ETEXI 2952 2953DEF("dtb", HAS_ARG, QEMU_OPTION_dtb, \ 2954 "-dtb file use 'file' as device tree image\n", QEMU_ARCH_ALL) 2955STEXI 2956@item -dtb @var{file} 2957@findex -dtb 2958Use @var{file} as a device tree binary (dtb) image and pass it to the kernel 2959on boot. 2960ETEXI 2961 2962STEXI 2963@end table 2964ETEXI 2965DEFHEADING() 2966 2967DEFHEADING(Debug/Expert options:) 2968STEXI 2969@table @option 2970ETEXI 2971 2972DEF("fw_cfg", HAS_ARG, QEMU_OPTION_fwcfg, 2973 "-fw_cfg [name=]<name>,file=<file>\n" 2974 " add named fw_cfg entry with contents from file\n" 2975 "-fw_cfg [name=]<name>,string=<str>\n" 2976 " add named fw_cfg entry with contents from string\n", 2977 QEMU_ARCH_ALL) 2978STEXI 2979 2980@item -fw_cfg [name=]@var{name},file=@var{file} 2981@findex -fw_cfg 2982Add named fw_cfg entry with contents from file @var{file}. 2983 2984@item -fw_cfg [name=]@var{name},string=@var{str} 2985Add named fw_cfg entry with contents from string @var{str}. 2986 2987The terminating NUL character of the contents of @var{str} will not be 2988included as part of the fw_cfg item data. To insert contents with 2989embedded NUL characters, you have to use the @var{file} parameter. 2990 2991The fw_cfg entries are passed by QEMU through to the guest. 2992 2993Example: 2994@example 2995 -fw_cfg name=opt/com.mycompany/blob,file=./my_blob.bin 2996@end example 2997creates an fw_cfg entry named opt/com.mycompany/blob with contents 2998from ./my_blob.bin. 2999 3000ETEXI 3001 3002DEF("serial", HAS_ARG, QEMU_OPTION_serial, \ 3003 "-serial dev redirect the serial port to char device 'dev'\n", 3004 QEMU_ARCH_ALL) 3005STEXI 3006@item -serial @var{dev} 3007@findex -serial 3008Redirect the virtual serial port to host character device 3009@var{dev}. The default device is @code{vc} in graphical mode and 3010@code{stdio} in non graphical mode. 3011 3012This option can be used several times to simulate up to 4 serial 3013ports. 3014 3015Use @code{-serial none} to disable all serial ports. 3016 3017Available character devices are: 3018@table @option 3019@item vc[:@var{W}x@var{H}] 3020Virtual console. Optionally, a width and height can be given in pixel with 3021@example 3022vc:800x600 3023@end example 3024It is also possible to specify width or height in characters: 3025@example 3026vc:80Cx24C 3027@end example 3028@item pty 3029[Linux only] Pseudo TTY (a new PTY is automatically allocated) 3030@item none 3031No device is allocated. 3032@item null 3033void device 3034@item chardev:@var{id} 3035Use a named character device defined with the @code{-chardev} option. 3036@item /dev/XXX 3037[Linux only] Use host tty, e.g. @file{/dev/ttyS0}. The host serial port 3038parameters are set according to the emulated ones. 3039@item /dev/parport@var{N} 3040[Linux only, parallel port only] Use host parallel port 3041@var{N}. Currently SPP and EPP parallel port features can be used. 3042@item file:@var{filename} 3043Write output to @var{filename}. No character can be read. 3044@item stdio 3045[Unix only] standard input/output 3046@item pipe:@var{filename} 3047name pipe @var{filename} 3048@item COM@var{n} 3049[Windows only] Use host serial port @var{n} 3050@item udp:[@var{remote_host}]:@var{remote_port}[@@[@var{src_ip}]:@var{src_port}] 3051This implements UDP Net Console. 3052When @var{remote_host} or @var{src_ip} are not specified 3053they default to @code{0.0.0.0}. 3054When not using a specified @var{src_port} a random port is automatically chosen. 3055 3056If you just want a simple readonly console you can use @code{netcat} or 3057@code{nc}, by starting QEMU with: @code{-serial udp::4555} and nc as: 3058@code{nc -u -l -p 4555}. Any time QEMU writes something to that port it 3059will appear in the netconsole session. 3060 3061If you plan to send characters back via netconsole or you want to stop 3062and start QEMU a lot of times, you should have QEMU use the same 3063source port each time by using something like @code{-serial 3064udp::4555@@:4556} to QEMU. Another approach is to use a patched 3065version of netcat which can listen to a TCP port and send and receive 3066characters via udp. If you have a patched version of netcat which 3067activates telnet remote echo and single char transfer, then you can 3068use the following options to set up a netcat redirector to allow 3069telnet on port 5555 to access the QEMU port. 3070@table @code 3071@item QEMU Options: 3072-serial udp::4555@@:4556 3073@item netcat options: 3074-u -P 4555 -L 0.0.0.0:4556 -t -p 5555 -I -T 3075@item telnet options: 3076localhost 5555 3077@end table 3078 3079@item tcp:[@var{host}]:@var{port}[,@var{server}][,nowait][,nodelay][,reconnect=@var{seconds}] 3080The TCP Net Console has two modes of operation. It can send the serial 3081I/O to a location or wait for a connection from a location. By default 3082the TCP Net Console is sent to @var{host} at the @var{port}. If you use 3083the @var{server} option QEMU will wait for a client socket application 3084to connect to the port before continuing, unless the @code{nowait} 3085option was specified. The @code{nodelay} option disables the Nagle buffering 3086algorithm. The @code{reconnect} option only applies if @var{noserver} is 3087set, if the connection goes down it will attempt to reconnect at the 3088given interval. If @var{host} is omitted, 0.0.0.0 is assumed. Only 3089one TCP connection at a time is accepted. You can use @code{telnet} to 3090connect to the corresponding character device. 3091@table @code 3092@item Example to send tcp console to 192.168.0.2 port 4444 3093-serial tcp:192.168.0.2:4444 3094@item Example to listen and wait on port 4444 for connection 3095-serial tcp::4444,server 3096@item Example to not wait and listen on ip 192.168.0.100 port 4444 3097-serial tcp:192.168.0.100:4444,server,nowait 3098@end table 3099 3100@item telnet:@var{host}:@var{port}[,server][,nowait][,nodelay] 3101The telnet protocol is used instead of raw tcp sockets. The options 3102work the same as if you had specified @code{-serial tcp}. The 3103difference is that the port acts like a telnet server or client using 3104telnet option negotiation. This will also allow you to send the 3105MAGIC_SYSRQ sequence if you use a telnet that supports sending the break 3106sequence. Typically in unix telnet you do it with Control-] and then 3107type "send break" followed by pressing the enter key. 3108 3109@item websocket:@var{host}:@var{port},server[,nowait][,nodelay] 3110The WebSocket protocol is used instead of raw tcp socket. The port acts as 3111a WebSocket server. Client mode is not supported. 3112 3113@item unix:@var{path}[,server][,nowait][,reconnect=@var{seconds}] 3114A unix domain socket is used instead of a tcp socket. The option works the 3115same as if you had specified @code{-serial tcp} except the unix domain socket 3116@var{path} is used for connections. 3117 3118@item mon:@var{dev_string} 3119This is a special option to allow the monitor to be multiplexed onto 3120another serial port. The monitor is accessed with key sequence of 3121@key{Control-a} and then pressing @key{c}. 3122@var{dev_string} should be any one of the serial devices specified 3123above. An example to multiplex the monitor onto a telnet server 3124listening on port 4444 would be: 3125@table @code 3126@item -serial mon:telnet::4444,server,nowait 3127@end table 3128When the monitor is multiplexed to stdio in this way, Ctrl+C will not terminate 3129QEMU any more but will be passed to the guest instead. 3130 3131@item braille 3132Braille device. This will use BrlAPI to display the braille output on a real 3133or fake device. 3134 3135@item msmouse 3136Three button serial mouse. Configure the guest to use Microsoft protocol. 3137@end table 3138ETEXI 3139 3140DEF("parallel", HAS_ARG, QEMU_OPTION_parallel, \ 3141 "-parallel dev redirect the parallel port to char device 'dev'\n", 3142 QEMU_ARCH_ALL) 3143STEXI 3144@item -parallel @var{dev} 3145@findex -parallel 3146Redirect the virtual parallel port to host device @var{dev} (same 3147devices as the serial port). On Linux hosts, @file{/dev/parportN} can 3148be used to use hardware devices connected on the corresponding host 3149parallel port. 3150 3151This option can be used several times to simulate up to 3 parallel 3152ports. 3153 3154Use @code{-parallel none} to disable all parallel ports. 3155ETEXI 3156 3157DEF("monitor", HAS_ARG, QEMU_OPTION_monitor, \ 3158 "-monitor dev redirect the monitor to char device 'dev'\n", 3159 QEMU_ARCH_ALL) 3160STEXI 3161@item -monitor @var{dev} 3162@findex -monitor 3163Redirect the monitor to host device @var{dev} (same devices as the 3164serial port). 3165The default device is @code{vc} in graphical mode and @code{stdio} in 3166non graphical mode. 3167Use @code{-monitor none} to disable the default monitor. 3168ETEXI 3169DEF("qmp", HAS_ARG, QEMU_OPTION_qmp, \ 3170 "-qmp dev like -monitor but opens in 'control' mode\n", 3171 QEMU_ARCH_ALL) 3172STEXI 3173@item -qmp @var{dev} 3174@findex -qmp 3175Like -monitor but opens in 'control' mode. 3176ETEXI 3177DEF("qmp-pretty", HAS_ARG, QEMU_OPTION_qmp_pretty, \ 3178 "-qmp-pretty dev like -qmp but uses pretty JSON formatting\n", 3179 QEMU_ARCH_ALL) 3180STEXI 3181@item -qmp-pretty @var{dev} 3182@findex -qmp-pretty 3183Like -qmp but uses pretty JSON formatting. 3184ETEXI 3185 3186DEF("mon", HAS_ARG, QEMU_OPTION_mon, \ 3187 "-mon [chardev=]name[,mode=readline|control][,pretty[=on|off]]\n", QEMU_ARCH_ALL) 3188STEXI 3189@item -mon [chardev=]name[,mode=readline|control][,pretty[=on|off]] 3190@findex -mon 3191Setup monitor on chardev @var{name}. @code{pretty} turns on JSON pretty printing 3192easing human reading and debugging. 3193ETEXI 3194 3195DEF("debugcon", HAS_ARG, QEMU_OPTION_debugcon, \ 3196 "-debugcon dev redirect the debug console to char device 'dev'\n", 3197 QEMU_ARCH_ALL) 3198STEXI 3199@item -debugcon @var{dev} 3200@findex -debugcon 3201Redirect the debug console to host device @var{dev} (same devices as the 3202serial port). The debug console is an I/O port which is typically port 32030xe9; writing to that I/O port sends output to this device. 3204The default device is @code{vc} in graphical mode and @code{stdio} in 3205non graphical mode. 3206ETEXI 3207 3208DEF("pidfile", HAS_ARG, QEMU_OPTION_pidfile, \ 3209 "-pidfile file write PID to 'file'\n", QEMU_ARCH_ALL) 3210STEXI 3211@item -pidfile @var{file} 3212@findex -pidfile 3213Store the QEMU process PID in @var{file}. It is useful if you launch QEMU 3214from a script. 3215ETEXI 3216 3217DEF("singlestep", 0, QEMU_OPTION_singlestep, \ 3218 "-singlestep always run in singlestep mode\n", QEMU_ARCH_ALL) 3219STEXI 3220@item -singlestep 3221@findex -singlestep 3222Run the emulation in single step mode. 3223ETEXI 3224 3225DEF("preconfig", 0, QEMU_OPTION_preconfig, \ 3226 "--preconfig pause QEMU before machine is initialized (experimental)\n", 3227 QEMU_ARCH_ALL) 3228STEXI 3229@item --preconfig 3230@findex --preconfig 3231Pause QEMU for interactive configuration before the machine is created, 3232which allows querying and configuring properties that will affect 3233machine initialization. Use QMP command 'x-exit-preconfig' to exit 3234the preconfig state and move to the next state (i.e. run guest if -S 3235isn't used or pause the second time if -S is used). This option is 3236experimental. 3237ETEXI 3238 3239DEF("S", 0, QEMU_OPTION_S, \ 3240 "-S freeze CPU at startup (use 'c' to start execution)\n", 3241 QEMU_ARCH_ALL) 3242STEXI 3243@item -S 3244@findex -S 3245Do not start CPU at startup (you must type 'c' in the monitor). 3246ETEXI 3247 3248DEF("realtime", HAS_ARG, QEMU_OPTION_realtime, 3249 "-realtime [mlock=on|off]\n" 3250 " run qemu with realtime features\n" 3251 " mlock=on|off controls mlock support (default: on)\n", 3252 QEMU_ARCH_ALL) 3253STEXI 3254@item -realtime mlock=on|off 3255@findex -realtime 3256Run qemu with realtime features. 3257mlocking qemu and guest memory can be enabled via @option{mlock=on} 3258(enabled by default). 3259ETEXI 3260 3261DEF("overcommit", HAS_ARG, QEMU_OPTION_overcommit, 3262 "-overcommit [mem-lock=on|off][cpu-pm=on|off]\n" 3263 " run qemu with overcommit hints\n" 3264 " mem-lock=on|off controls memory lock support (default: off)\n" 3265 " cpu-pm=on|off controls cpu power management (default: off)\n", 3266 QEMU_ARCH_ALL) 3267STEXI 3268@item -overcommit mem-lock=on|off 3269@item -overcommit cpu-pm=on|off 3270@findex -overcommit 3271Run qemu with hints about host resource overcommit. The default is 3272to assume that host overcommits all resources. 3273 3274Locking qemu and guest memory can be enabled via @option{mem-lock=on} (disabled 3275by default). This works when host memory is not overcommitted and reduces the 3276worst-case latency for guest. This is equivalent to @option{realtime}. 3277 3278Guest ability to manage power state of host cpus (increasing latency for other 3279processes on the same host cpu, but decreasing latency for guest) can be 3280enabled via @option{cpu-pm=on} (disabled by default). This works best when 3281host CPU is not overcommitted. When used, host estimates of CPU cycle and power 3282utilization will be incorrect, not taking into account guest idle time. 3283ETEXI 3284 3285DEF("gdb", HAS_ARG, QEMU_OPTION_gdb, \ 3286 "-gdb dev wait for gdb connection on 'dev'\n", QEMU_ARCH_ALL) 3287STEXI 3288@item -gdb @var{dev} 3289@findex -gdb 3290Wait for gdb connection on device @var{dev} (@pxref{gdb_usage}). Typical 3291connections will likely be TCP-based, but also UDP, pseudo TTY, or even 3292stdio are reasonable use case. The latter is allowing to start QEMU from 3293within gdb and establish the connection via a pipe: 3294@example 3295(gdb) target remote | exec qemu-system-i386 -gdb stdio ... 3296@end example 3297ETEXI 3298 3299DEF("s", 0, QEMU_OPTION_s, \ 3300 "-s shorthand for -gdb tcp::" DEFAULT_GDBSTUB_PORT "\n", 3301 QEMU_ARCH_ALL) 3302STEXI 3303@item -s 3304@findex -s 3305Shorthand for -gdb tcp::1234, i.e. open a gdbserver on TCP port 1234 3306(@pxref{gdb_usage}). 3307ETEXI 3308 3309DEF("d", HAS_ARG, QEMU_OPTION_d, \ 3310 "-d item1,... enable logging of specified items (use '-d help' for a list of log items)\n", 3311 QEMU_ARCH_ALL) 3312STEXI 3313@item -d @var{item1}[,...] 3314@findex -d 3315Enable logging of specified items. Use '-d help' for a list of log items. 3316ETEXI 3317 3318DEF("D", HAS_ARG, QEMU_OPTION_D, \ 3319 "-D logfile output log to logfile (default stderr)\n", 3320 QEMU_ARCH_ALL) 3321STEXI 3322@item -D @var{logfile} 3323@findex -D 3324Output log in @var{logfile} instead of to stderr 3325ETEXI 3326 3327DEF("dfilter", HAS_ARG, QEMU_OPTION_DFILTER, \ 3328 "-dfilter range,.. filter debug output to range of addresses (useful for -d cpu,exec,etc..)\n", 3329 QEMU_ARCH_ALL) 3330STEXI 3331@item -dfilter @var{range1}[,...] 3332@findex -dfilter 3333Filter debug output to that relevant to a range of target addresses. The filter 3334spec can be either @var{start}+@var{size}, @var{start}-@var{size} or 3335@var{start}..@var{end} where @var{start} @var{end} and @var{size} are the 3336addresses and sizes required. For example: 3337@example 3338 -dfilter 0x8000..0x8fff,0xffffffc000080000+0x200,0xffffffc000060000-0x1000 3339@end example 3340Will dump output for any code in the 0x1000 sized block starting at 0x8000 and 3341the 0x200 sized block starting at 0xffffffc000080000 and another 0x1000 sized 3342block starting at 0xffffffc00005f000. 3343ETEXI 3344 3345DEF("L", HAS_ARG, QEMU_OPTION_L, \ 3346 "-L path set the directory for the BIOS, VGA BIOS and keymaps\n", 3347 QEMU_ARCH_ALL) 3348STEXI 3349@item -L @var{path} 3350@findex -L 3351Set the directory for the BIOS, VGA BIOS and keymaps. 3352 3353To list all the data directories, use @code{-L help}. 3354ETEXI 3355 3356DEF("bios", HAS_ARG, QEMU_OPTION_bios, \ 3357 "-bios file set the filename for the BIOS\n", QEMU_ARCH_ALL) 3358STEXI 3359@item -bios @var{file} 3360@findex -bios 3361Set the filename for the BIOS. 3362ETEXI 3363 3364DEF("enable-kvm", 0, QEMU_OPTION_enable_kvm, \ 3365 "-enable-kvm enable KVM full virtualization support\n", QEMU_ARCH_ALL) 3366STEXI 3367@item -enable-kvm 3368@findex -enable-kvm 3369Enable KVM full virtualization support. This option is only available 3370if KVM support is enabled when compiling. 3371ETEXI 3372 3373DEF("xen-domid", HAS_ARG, QEMU_OPTION_xen_domid, 3374 "-xen-domid id specify xen guest domain id\n", QEMU_ARCH_ALL) 3375DEF("xen-attach", 0, QEMU_OPTION_xen_attach, 3376 "-xen-attach attach to existing xen domain\n" 3377 " libxl will use this when starting QEMU\n", 3378 QEMU_ARCH_ALL) 3379DEF("xen-domid-restrict", 0, QEMU_OPTION_xen_domid_restrict, 3380 "-xen-domid-restrict restrict set of available xen operations\n" 3381 " to specified domain id. (Does not affect\n" 3382 " xenpv machine type).\n", 3383 QEMU_ARCH_ALL) 3384STEXI 3385@item -xen-domid @var{id} 3386@findex -xen-domid 3387Specify xen guest domain @var{id} (XEN only). 3388@item -xen-attach 3389@findex -xen-attach 3390Attach to existing xen domain. 3391libxl will use this when starting QEMU (XEN only). 3392@findex -xen-domid-restrict 3393Restrict set of available xen operations to specified domain id (XEN only). 3394ETEXI 3395 3396DEF("no-reboot", 0, QEMU_OPTION_no_reboot, \ 3397 "-no-reboot exit instead of rebooting\n", QEMU_ARCH_ALL) 3398STEXI 3399@item -no-reboot 3400@findex -no-reboot 3401Exit instead of rebooting. 3402ETEXI 3403 3404DEF("no-shutdown", 0, QEMU_OPTION_no_shutdown, \ 3405 "-no-shutdown stop before shutdown\n", QEMU_ARCH_ALL) 3406STEXI 3407@item -no-shutdown 3408@findex -no-shutdown 3409Don't exit QEMU on guest shutdown, but instead only stop the emulation. 3410This allows for instance switching to monitor to commit changes to the 3411disk image. 3412ETEXI 3413 3414DEF("loadvm", HAS_ARG, QEMU_OPTION_loadvm, \ 3415 "-loadvm [tag|id]\n" \ 3416 " start right away with a saved state (loadvm in monitor)\n", 3417 QEMU_ARCH_ALL) 3418STEXI 3419@item -loadvm @var{file} 3420@findex -loadvm 3421Start right away with a saved state (@code{loadvm} in monitor) 3422ETEXI 3423 3424#ifndef _WIN32 3425DEF("daemonize", 0, QEMU_OPTION_daemonize, \ 3426 "-daemonize daemonize QEMU after initializing\n", QEMU_ARCH_ALL) 3427#endif 3428STEXI 3429@item -daemonize 3430@findex -daemonize 3431Daemonize the QEMU process after initialization. QEMU will not detach from 3432standard IO until it is ready to receive connections on any of its devices. 3433This option is a useful way for external programs to launch QEMU without having 3434to cope with initialization race conditions. 3435ETEXI 3436 3437DEF("option-rom", HAS_ARG, QEMU_OPTION_option_rom, \ 3438 "-option-rom rom load a file, rom, into the option ROM space\n", 3439 QEMU_ARCH_ALL) 3440STEXI 3441@item -option-rom @var{file} 3442@findex -option-rom 3443Load the contents of @var{file} as an option ROM. 3444This option is useful to load things like EtherBoot. 3445ETEXI 3446 3447HXCOMM Silently ignored for compatibility 3448DEF("clock", HAS_ARG, QEMU_OPTION_clock, "", QEMU_ARCH_ALL) 3449 3450DEF("rtc", HAS_ARG, QEMU_OPTION_rtc, \ 3451 "-rtc [base=utc|localtime|<datetime>][,clock=host|rt|vm][,driftfix=none|slew]\n" \ 3452 " set the RTC base and clock, enable drift fix for clock ticks (x86 only)\n", 3453 QEMU_ARCH_ALL) 3454 3455STEXI 3456 3457@item -rtc [base=utc|localtime|@var{datetime}][,clock=host|rt|vm][,driftfix=none|slew] 3458@findex -rtc 3459Specify @option{base} as @code{utc} or @code{localtime} to let the RTC start at the current 3460UTC or local time, respectively. @code{localtime} is required for correct date in 3461MS-DOS or Windows. To start at a specific point in time, provide @var{datetime} in the 3462format @code{2006-06-17T16:01:21} or @code{2006-06-17}. The default base is UTC. 3463 3464By default the RTC is driven by the host system time. This allows using of the 3465RTC as accurate reference clock inside the guest, specifically if the host 3466time is smoothly following an accurate external reference clock, e.g. via NTP. 3467If you want to isolate the guest time from the host, you can set @option{clock} 3468to @code{rt} instead, which provides a host monotonic clock if host support it. 3469To even prevent the RTC from progressing during suspension, you can set @option{clock} 3470to @code{vm} (virtual clock). @samp{clock=vm} is recommended especially in 3471icount mode in order to preserve determinism; however, note that in icount mode 3472the speed of the virtual clock is variable and can in general differ from the 3473host clock. 3474 3475Enable @option{driftfix} (i386 targets only) if you experience time drift problems, 3476specifically with Windows' ACPI HAL. This option will try to figure out how 3477many timer interrupts were not processed by the Windows guest and will 3478re-inject them. 3479ETEXI 3480 3481DEF("icount", HAS_ARG, QEMU_OPTION_icount, \ 3482 "-icount [shift=N|auto][,align=on|off][,sleep=on|off,rr=record|replay,rrfile=<filename>,rrsnapshot=<snapshot>]\n" \ 3483 " enable virtual instruction counter with 2^N clock ticks per\n" \ 3484 " instruction, enable aligning the host and virtual clocks\n" \ 3485 " or disable real time cpu sleeping\n", QEMU_ARCH_ALL) 3486STEXI 3487@item -icount [shift=@var{N}|auto][,rr=record|replay,rrfile=@var{filename},rrsnapshot=@var{snapshot}] 3488@findex -icount 3489Enable virtual instruction counter. The virtual cpu will execute one 3490instruction every 2^@var{N} ns of virtual time. If @code{auto} is specified 3491then the virtual cpu speed will be automatically adjusted to keep virtual 3492time within a few seconds of real time. 3493 3494When the virtual cpu is sleeping, the virtual time will advance at default 3495speed unless @option{sleep=on|off} is specified. 3496With @option{sleep=on|off}, the virtual time will jump to the next timer deadline 3497instantly whenever the virtual cpu goes to sleep mode and will not advance 3498if no timer is enabled. This behavior give deterministic execution times from 3499the guest point of view. 3500 3501Note that while this option can give deterministic behavior, it does not 3502provide cycle accurate emulation. Modern CPUs contain superscalar out of 3503order cores with complex cache hierarchies. The number of instructions 3504executed often has little or no correlation with actual performance. 3505 3506@option{align=on} will activate the delay algorithm which will try 3507to synchronise the host clock and the virtual clock. The goal is to 3508have a guest running at the real frequency imposed by the shift option. 3509Whenever the guest clock is behind the host clock and if 3510@option{align=on} is specified then we print a message to the user 3511to inform about the delay. 3512Currently this option does not work when @option{shift} is @code{auto}. 3513Note: The sync algorithm will work for those shift values for which 3514the guest clock runs ahead of the host clock. Typically this happens 3515when the shift value is high (how high depends on the host machine). 3516 3517When @option{rr} option is specified deterministic record/replay is enabled. 3518Replay log is written into @var{filename} file in record mode and 3519read from this file in replay mode. 3520 3521Option rrsnapshot is used to create new vm snapshot named @var{snapshot} 3522at the start of execution recording. In replay mode this option is used 3523to load the initial VM state. 3524ETEXI 3525 3526DEF("watchdog", HAS_ARG, QEMU_OPTION_watchdog, \ 3527 "-watchdog model\n" \ 3528 " enable virtual hardware watchdog [default=none]\n", 3529 QEMU_ARCH_ALL) 3530STEXI 3531@item -watchdog @var{model} 3532@findex -watchdog 3533Create a virtual hardware watchdog device. Once enabled (by a guest 3534action), the watchdog must be periodically polled by an agent inside 3535the guest or else the guest will be restarted. Choose a model for 3536which your guest has drivers. 3537 3538The @var{model} is the model of hardware watchdog to emulate. Use 3539@code{-watchdog help} to list available hardware models. Only one 3540watchdog can be enabled for a guest. 3541 3542The following models may be available: 3543@table @option 3544@item ib700 3545iBASE 700 is a very simple ISA watchdog with a single timer. 3546@item i6300esb 3547Intel 6300ESB I/O controller hub is a much more featureful PCI-based 3548dual-timer watchdog. 3549@item diag288 3550A virtual watchdog for s390x backed by the diagnose 288 hypercall 3551(currently KVM only). 3552@end table 3553ETEXI 3554 3555DEF("watchdog-action", HAS_ARG, QEMU_OPTION_watchdog_action, \ 3556 "-watchdog-action reset|shutdown|poweroff|inject-nmi|pause|debug|none\n" \ 3557 " action when watchdog fires [default=reset]\n", 3558 QEMU_ARCH_ALL) 3559STEXI 3560@item -watchdog-action @var{action} 3561@findex -watchdog-action 3562 3563The @var{action} controls what QEMU will do when the watchdog timer 3564expires. 3565The default is 3566@code{reset} (forcefully reset the guest). 3567Other possible actions are: 3568@code{shutdown} (attempt to gracefully shutdown the guest), 3569@code{poweroff} (forcefully poweroff the guest), 3570@code{inject-nmi} (inject a NMI into the guest), 3571@code{pause} (pause the guest), 3572@code{debug} (print a debug message and continue), or 3573@code{none} (do nothing). 3574 3575Note that the @code{shutdown} action requires that the guest responds 3576to ACPI signals, which it may not be able to do in the sort of 3577situations where the watchdog would have expired, and thus 3578@code{-watchdog-action shutdown} is not recommended for production use. 3579 3580Examples: 3581 3582@table @code 3583@item -watchdog i6300esb -watchdog-action pause 3584@itemx -watchdog ib700 3585@end table 3586ETEXI 3587 3588DEF("echr", HAS_ARG, QEMU_OPTION_echr, \ 3589 "-echr chr set terminal escape character instead of ctrl-a\n", 3590 QEMU_ARCH_ALL) 3591STEXI 3592 3593@item -echr @var{numeric_ascii_value} 3594@findex -echr 3595Change the escape character used for switching to the monitor when using 3596monitor and serial sharing. The default is @code{0x01} when using the 3597@code{-nographic} option. @code{0x01} is equal to pressing 3598@code{Control-a}. You can select a different character from the ascii 3599control keys where 1 through 26 map to Control-a through Control-z. For 3600instance you could use the either of the following to change the escape 3601character to Control-t. 3602@table @code 3603@item -echr 0x14 3604@itemx -echr 20 3605@end table 3606ETEXI 3607 3608DEF("show-cursor", 0, QEMU_OPTION_show_cursor, \ 3609 "-show-cursor show cursor\n", QEMU_ARCH_ALL) 3610STEXI 3611@item -show-cursor 3612@findex -show-cursor 3613Show cursor. 3614ETEXI 3615 3616DEF("tb-size", HAS_ARG, QEMU_OPTION_tb_size, \ 3617 "-tb-size n set TB size\n", QEMU_ARCH_ALL) 3618STEXI 3619@item -tb-size @var{n} 3620@findex -tb-size 3621Set TB size. 3622ETEXI 3623 3624DEF("incoming", HAS_ARG, QEMU_OPTION_incoming, \ 3625 "-incoming tcp:[host]:port[,to=maxport][,ipv4][,ipv6]\n" \ 3626 "-incoming rdma:host:port[,ipv4][,ipv6]\n" \ 3627 "-incoming unix:socketpath\n" \ 3628 " prepare for incoming migration, listen on\n" \ 3629 " specified protocol and socket address\n" \ 3630 "-incoming fd:fd\n" \ 3631 "-incoming exec:cmdline\n" \ 3632 " accept incoming migration on given file descriptor\n" \ 3633 " or from given external command\n" \ 3634 "-incoming defer\n" \ 3635 " wait for the URI to be specified via migrate_incoming\n", 3636 QEMU_ARCH_ALL) 3637STEXI 3638@item -incoming tcp:[@var{host}]:@var{port}[,to=@var{maxport}][,ipv4][,ipv6] 3639@itemx -incoming rdma:@var{host}:@var{port}[,ipv4][,ipv6] 3640@findex -incoming 3641Prepare for incoming migration, listen on a given tcp port. 3642 3643@item -incoming unix:@var{socketpath} 3644Prepare for incoming migration, listen on a given unix socket. 3645 3646@item -incoming fd:@var{fd} 3647Accept incoming migration from a given filedescriptor. 3648 3649@item -incoming exec:@var{cmdline} 3650Accept incoming migration as an output from specified external command. 3651 3652@item -incoming defer 3653Wait for the URI to be specified via migrate_incoming. The monitor can 3654be used to change settings (such as migration parameters) prior to issuing 3655the migrate_incoming to allow the migration to begin. 3656ETEXI 3657 3658DEF("only-migratable", 0, QEMU_OPTION_only_migratable, \ 3659 "-only-migratable allow only migratable devices\n", QEMU_ARCH_ALL) 3660STEXI 3661@item -only-migratable 3662@findex -only-migratable 3663Only allow migratable devices. Devices will not be allowed to enter an 3664unmigratable state. 3665ETEXI 3666 3667DEF("nodefaults", 0, QEMU_OPTION_nodefaults, \ 3668 "-nodefaults don't create default devices\n", QEMU_ARCH_ALL) 3669STEXI 3670@item -nodefaults 3671@findex -nodefaults 3672Don't create default devices. Normally, QEMU sets the default devices like serial 3673port, parallel port, virtual console, monitor device, VGA adapter, floppy and 3674CD-ROM drive and others. The @code{-nodefaults} option will disable all those 3675default devices. 3676ETEXI 3677 3678#ifndef _WIN32 3679DEF("chroot", HAS_ARG, QEMU_OPTION_chroot, \ 3680 "-chroot dir chroot to dir just before starting the VM\n", 3681 QEMU_ARCH_ALL) 3682#endif 3683STEXI 3684@item -chroot @var{dir} 3685@findex -chroot 3686Immediately before starting guest execution, chroot to the specified 3687directory. Especially useful in combination with -runas. 3688ETEXI 3689 3690#ifndef _WIN32 3691DEF("runas", HAS_ARG, QEMU_OPTION_runas, \ 3692 "-runas user change to user id user just before starting the VM\n" \ 3693 " user can be numeric uid:gid instead\n", 3694 QEMU_ARCH_ALL) 3695#endif 3696STEXI 3697@item -runas @var{user} 3698@findex -runas 3699Immediately before starting guest execution, drop root privileges, switching 3700to the specified user. 3701ETEXI 3702 3703DEF("prom-env", HAS_ARG, QEMU_OPTION_prom_env, 3704 "-prom-env variable=value\n" 3705 " set OpenBIOS nvram variables\n", 3706 QEMU_ARCH_PPC | QEMU_ARCH_SPARC) 3707STEXI 3708@item -prom-env @var{variable}=@var{value} 3709@findex -prom-env 3710Set OpenBIOS nvram @var{variable} to given @var{value} (PPC, SPARC only). 3711ETEXI 3712DEF("semihosting", 0, QEMU_OPTION_semihosting, 3713 "-semihosting semihosting mode\n", 3714 QEMU_ARCH_ARM | QEMU_ARCH_M68K | QEMU_ARCH_XTENSA | QEMU_ARCH_LM32 | 3715 QEMU_ARCH_MIPS) 3716STEXI 3717@item -semihosting 3718@findex -semihosting 3719Enable semihosting mode (ARM, M68K, Xtensa, MIPS only). 3720ETEXI 3721DEF("semihosting-config", HAS_ARG, QEMU_OPTION_semihosting_config, 3722 "-semihosting-config [enable=on|off][,target=native|gdb|auto][,arg=str[,...]]\n" \ 3723 " semihosting configuration\n", 3724QEMU_ARCH_ARM | QEMU_ARCH_M68K | QEMU_ARCH_XTENSA | QEMU_ARCH_LM32 | 3725QEMU_ARCH_MIPS) 3726STEXI 3727@item -semihosting-config [enable=on|off][,target=native|gdb|auto][,arg=str[,...]] 3728@findex -semihosting-config 3729Enable and configure semihosting (ARM, M68K, Xtensa, MIPS only). 3730@table @option 3731@item target=@code{native|gdb|auto} 3732Defines where the semihosting calls will be addressed, to QEMU (@code{native}) 3733or to GDB (@code{gdb}). The default is @code{auto}, which means @code{gdb} 3734during debug sessions and @code{native} otherwise. 3735@item arg=@var{str1},arg=@var{str2},... 3736Allows the user to pass input arguments, and can be used multiple times to build 3737up a list. The old-style @code{-kernel}/@code{-append} method of passing a 3738command line is still supported for backward compatibility. If both the 3739@code{--semihosting-config arg} and the @code{-kernel}/@code{-append} are 3740specified, the former is passed to semihosting as it always takes precedence. 3741@end table 3742ETEXI 3743DEF("old-param", 0, QEMU_OPTION_old_param, 3744 "-old-param old param mode\n", QEMU_ARCH_ARM) 3745STEXI 3746@item -old-param 3747@findex -old-param (ARM) 3748Old param mode (ARM only). 3749ETEXI 3750 3751DEF("sandbox", HAS_ARG, QEMU_OPTION_sandbox, \ 3752 "-sandbox on[,obsolete=allow|deny][,elevateprivileges=allow|deny|children]\n" \ 3753 " [,spawn=allow|deny][,resourcecontrol=allow|deny]\n" \ 3754 " Enable seccomp mode 2 system call filter (default 'off').\n" \ 3755 " use 'obsolete' to allow obsolete system calls that are provided\n" \ 3756 " by the kernel, but typically no longer used by modern\n" \ 3757 " C library implementations.\n" \ 3758 " use 'elevateprivileges' to allow or deny QEMU process to elevate\n" \ 3759 " its privileges by blacklisting all set*uid|gid system calls.\n" \ 3760 " The value 'children' will deny set*uid|gid system calls for\n" \ 3761 " main QEMU process but will allow forks and execves to run unprivileged\n" \ 3762 " use 'spawn' to avoid QEMU to spawn new threads or processes by\n" \ 3763 " blacklisting *fork and execve\n" \ 3764 " use 'resourcecontrol' to disable process affinity and schedular priority\n", 3765 QEMU_ARCH_ALL) 3766STEXI 3767@item -sandbox @var{arg}[,obsolete=@var{string}][,elevateprivileges=@var{string}][,spawn=@var{string}][,resourcecontrol=@var{string}] 3768@findex -sandbox 3769Enable Seccomp mode 2 system call filter. 'on' will enable syscall filtering and 'off' will 3770disable it. The default is 'off'. 3771@table @option 3772@item obsolete=@var{string} 3773Enable Obsolete system calls 3774@item elevateprivileges=@var{string} 3775Disable set*uid|gid system calls 3776@item spawn=@var{string} 3777Disable *fork and execve 3778@item resourcecontrol=@var{string} 3779Disable process affinity and schedular priority 3780@end table 3781ETEXI 3782 3783DEF("readconfig", HAS_ARG, QEMU_OPTION_readconfig, 3784 "-readconfig <file>\n", QEMU_ARCH_ALL) 3785STEXI 3786@item -readconfig @var{file} 3787@findex -readconfig 3788Read device configuration from @var{file}. This approach is useful when you want to spawn 3789QEMU process with many command line options but you don't want to exceed the command line 3790character limit. 3791ETEXI 3792DEF("writeconfig", HAS_ARG, QEMU_OPTION_writeconfig, 3793 "-writeconfig <file>\n" 3794 " read/write config file\n", QEMU_ARCH_ALL) 3795STEXI 3796@item -writeconfig @var{file} 3797@findex -writeconfig 3798Write device configuration to @var{file}. The @var{file} can be either filename to save 3799command line and device configuration into file or dash @code{-}) character to print the 3800output to stdout. This can be later used as input file for @code{-readconfig} option. 3801ETEXI 3802 3803DEF("no-user-config", 0, QEMU_OPTION_nouserconfig, 3804 "-no-user-config\n" 3805 " do not load default user-provided config files at startup\n", 3806 QEMU_ARCH_ALL) 3807STEXI 3808@item -no-user-config 3809@findex -no-user-config 3810The @code{-no-user-config} option makes QEMU not load any of the user-provided 3811config files on @var{sysconfdir}. 3812ETEXI 3813 3814DEF("trace", HAS_ARG, QEMU_OPTION_trace, 3815 "-trace [[enable=]<pattern>][,events=<file>][,file=<file>]\n" 3816 " specify tracing options\n", 3817 QEMU_ARCH_ALL) 3818STEXI 3819HXCOMM This line is not accurate, as some sub-options are backend-specific but 3820HXCOMM HX does not support conditional compilation of text. 3821@item -trace [[enable=]@var{pattern}][,events=@var{file}][,file=@var{file}] 3822@findex -trace 3823@include qemu-option-trace.texi 3824ETEXI 3825 3826HXCOMM Internal use 3827DEF("qtest", HAS_ARG, QEMU_OPTION_qtest, "", QEMU_ARCH_ALL) 3828DEF("qtest-log", HAS_ARG, QEMU_OPTION_qtest_log, "", QEMU_ARCH_ALL) 3829 3830#ifdef __linux__ 3831DEF("enable-fips", 0, QEMU_OPTION_enablefips, 3832 "-enable-fips enable FIPS 140-2 compliance\n", 3833 QEMU_ARCH_ALL) 3834#endif 3835STEXI 3836@item -enable-fips 3837@findex -enable-fips 3838Enable FIPS 140-2 compliance mode. 3839ETEXI 3840 3841HXCOMM Deprecated by -machine accel=tcg property 3842DEF("no-kvm", 0, QEMU_OPTION_no_kvm, "", QEMU_ARCH_I386) 3843 3844DEF("msg", HAS_ARG, QEMU_OPTION_msg, 3845 "-msg timestamp[=on|off]\n" 3846 " change the format of messages\n" 3847 " on|off controls leading timestamps (default:on)\n", 3848 QEMU_ARCH_ALL) 3849STEXI 3850@item -msg timestamp[=on|off] 3851@findex -msg 3852prepend a timestamp to each log message.(default:on) 3853ETEXI 3854 3855DEF("dump-vmstate", HAS_ARG, QEMU_OPTION_dump_vmstate, 3856 "-dump-vmstate <file>\n" 3857 " Output vmstate information in JSON format to file.\n" 3858 " Use the scripts/vmstate-static-checker.py file to\n" 3859 " check for possible regressions in migration code\n" 3860 " by comparing two such vmstate dumps.\n", 3861 QEMU_ARCH_ALL) 3862STEXI 3863@item -dump-vmstate @var{file} 3864@findex -dump-vmstate 3865Dump json-encoded vmstate information for current machine type to file 3866in @var{file} 3867ETEXI 3868 3869DEF("enable-sync-profile", 0, QEMU_OPTION_enable_sync_profile, 3870 "-enable-sync-profile\n" 3871 " enable synchronization profiling\n", 3872 QEMU_ARCH_ALL) 3873STEXI 3874@item -enable-sync-profile 3875@findex -enable-sync-profile 3876Enable synchronization profiling. 3877ETEXI 3878 3879STEXI 3880@end table 3881ETEXI 3882DEFHEADING() 3883 3884DEFHEADING(Generic object creation:) 3885STEXI 3886@table @option 3887ETEXI 3888 3889DEF("object", HAS_ARG, QEMU_OPTION_object, 3890 "-object TYPENAME[,PROP1=VALUE1,...]\n" 3891 " create a new object of type TYPENAME setting properties\n" 3892 " in the order they are specified. Note that the 'id'\n" 3893 " property must be set. These objects are placed in the\n" 3894 " '/objects' path.\n", 3895 QEMU_ARCH_ALL) 3896STEXI 3897@item -object @var{typename}[,@var{prop1}=@var{value1},...] 3898@findex -object 3899Create a new object of type @var{typename} setting properties 3900in the order they are specified. Note that the 'id' 3901property must be set. These objects are placed in the 3902'/objects' path. 3903 3904@table @option 3905 3906@item -object memory-backend-file,id=@var{id},size=@var{size},mem-path=@var{dir},share=@var{on|off},discard-data=@var{on|off},merge=@var{on|off},dump=@var{on|off},prealloc=@var{on|off},host-nodes=@var{host-nodes},policy=@var{default|preferred|bind|interleave},align=@var{align} 3907 3908Creates a memory file backend object, which can be used to back 3909the guest RAM with huge pages. 3910 3911The @option{id} parameter is a unique ID that will be used to reference this 3912memory region when configuring the @option{-numa} argument. 3913 3914The @option{size} option provides the size of the memory region, and accepts 3915common suffixes, eg @option{500M}. 3916 3917The @option{mem-path} provides the path to either a shared memory or huge page 3918filesystem mount. 3919 3920The @option{share} boolean option determines whether the memory 3921region is marked as private to QEMU, or shared. The latter allows 3922a co-operating external process to access the QEMU memory region. 3923 3924The @option{share} is also required for pvrdma devices due to 3925limitations in the RDMA API provided by Linux. 3926 3927Setting share=on might affect the ability to configure NUMA 3928bindings for the memory backend under some circumstances, see 3929Documentation/vm/numa_memory_policy.txt on the Linux kernel 3930source tree for additional details. 3931 3932Setting the @option{discard-data} boolean option to @var{on} 3933indicates that file contents can be destroyed when QEMU exits, 3934to avoid unnecessarily flushing data to the backing file. Note 3935that @option{discard-data} is only an optimization, and QEMU 3936might not discard file contents if it aborts unexpectedly or is 3937terminated using SIGKILL. 3938 3939The @option{merge} boolean option enables memory merge, also known as 3940MADV_MERGEABLE, so that Kernel Samepage Merging will consider the pages for 3941memory deduplication. 3942 3943Setting the @option{dump} boolean option to @var{off} excludes the memory from 3944core dumps. This feature is also known as MADV_DONTDUMP. 3945 3946The @option{prealloc} boolean option enables memory preallocation. 3947 3948The @option{host-nodes} option binds the memory range to a list of NUMA host 3949nodes. 3950 3951The @option{policy} option sets the NUMA policy to one of the following values: 3952 3953@table @option 3954@item @var{default} 3955default host policy 3956 3957@item @var{preferred} 3958prefer the given host node list for allocation 3959 3960@item @var{bind} 3961restrict memory allocation to the given host node list 3962 3963@item @var{interleave} 3964interleave memory allocations across the given host node list 3965@end table 3966 3967The @option{align} option specifies the base address alignment when 3968QEMU mmap(2) @option{mem-path}, and accepts common suffixes, eg 3969@option{2M}. Some backend store specified by @option{mem-path} 3970requires an alignment different than the default one used by QEMU, eg 3971the device DAX /dev/dax0.0 requires 2M alignment rather than 4K. In 3972such cases, users can specify the required alignment via this option. 3973 3974The @option{pmem} option specifies whether the backing file specified 3975by @option{mem-path} is in host persistent memory that can be accessed 3976using the SNIA NVM programming model (e.g. Intel NVDIMM). 3977If @option{pmem} is set to 'on', QEMU will take necessary operations to 3978guarantee the persistence of its own writes to @option{mem-path} 3979(e.g. in vNVDIMM label emulation and live migration). 3980 3981@item -object memory-backend-ram,id=@var{id},merge=@var{on|off},dump=@var{on|off},share=@var{on|off},prealloc=@var{on|off},size=@var{size},host-nodes=@var{host-nodes},policy=@var{default|preferred|bind|interleave} 3982 3983Creates a memory backend object, which can be used to back the guest RAM. 3984Memory backend objects offer more control than the @option{-m} option that is 3985traditionally used to define guest RAM. Please refer to 3986@option{memory-backend-file} for a description of the options. 3987 3988@item -object memory-backend-memfd,id=@var{id},merge=@var{on|off},dump=@var{on|off},share=@var{on|off},prealloc=@var{on|off},size=@var{size},host-nodes=@var{host-nodes},policy=@var{default|preferred|bind|interleave},seal=@var{on|off},hugetlb=@var{on|off},hugetlbsize=@var{size} 3989 3990Creates an anonymous memory file backend object, which allows QEMU to 3991share the memory with an external process (e.g. when using 3992vhost-user). The memory is allocated with memfd and optional 3993sealing. (Linux only) 3994 3995The @option{seal} option creates a sealed-file, that will block 3996further resizing the memory ('on' by default). 3997 3998The @option{hugetlb} option specify the file to be created resides in 3999the hugetlbfs filesystem (since Linux 4.14). Used in conjunction with 4000the @option{hugetlb} option, the @option{hugetlbsize} option specify 4001the hugetlb page size on systems that support multiple hugetlb page 4002sizes (it must be a power of 2 value supported by the system). 4003 4004In some versions of Linux, the @option{hugetlb} option is incompatible 4005with the @option{seal} option (requires at least Linux 4.16). 4006 4007Please refer to @option{memory-backend-file} for a description of the 4008other options. 4009 4010The @option{share} boolean option is @var{on} by default with memfd. 4011 4012@item -object rng-random,id=@var{id},filename=@var{/dev/random} 4013 4014Creates a random number generator backend which obtains entropy from 4015a device on the host. The @option{id} parameter is a unique ID that 4016will be used to reference this entropy backend from the @option{virtio-rng} 4017device. The @option{filename} parameter specifies which file to obtain 4018entropy from and if omitted defaults to @option{/dev/random}. 4019 4020@item -object rng-egd,id=@var{id},chardev=@var{chardevid} 4021 4022Creates a random number generator backend which obtains entropy from 4023an external daemon running on the host. The @option{id} parameter is 4024a unique ID that will be used to reference this entropy backend from 4025the @option{virtio-rng} device. The @option{chardev} parameter is 4026the unique ID of a character device backend that provides the connection 4027to the RNG daemon. 4028 4029@item -object tls-creds-anon,id=@var{id},endpoint=@var{endpoint},dir=@var{/path/to/cred/dir},verify-peer=@var{on|off} 4030 4031Creates a TLS anonymous credentials object, which can be used to provide 4032TLS support on network backends. The @option{id} parameter is a unique 4033ID which network backends will use to access the credentials. The 4034@option{endpoint} is either @option{server} or @option{client} depending 4035on whether the QEMU network backend that uses the credentials will be 4036acting as a client or as a server. If @option{verify-peer} is enabled 4037(the default) then once the handshake is completed, the peer credentials 4038will be verified, though this is a no-op for anonymous credentials. 4039 4040The @var{dir} parameter tells QEMU where to find the credential 4041files. For server endpoints, this directory may contain a file 4042@var{dh-params.pem} providing diffie-hellman parameters to use 4043for the TLS server. If the file is missing, QEMU will generate 4044a set of DH parameters at startup. This is a computationally 4045expensive operation that consumes random pool entropy, so it is 4046recommended that a persistent set of parameters be generated 4047upfront and saved. 4048 4049@item -object tls-creds-psk,id=@var{id},endpoint=@var{endpoint},dir=@var{/path/to/keys/dir}[,username=@var{username}] 4050 4051Creates a TLS Pre-Shared Keys (PSK) credentials object, which can be used to provide 4052TLS support on network backends. The @option{id} parameter is a unique 4053ID which network backends will use to access the credentials. The 4054@option{endpoint} is either @option{server} or @option{client} depending 4055on whether the QEMU network backend that uses the credentials will be 4056acting as a client or as a server. For clients only, @option{username} 4057is the username which will be sent to the server. If omitted 4058it defaults to ``qemu''. 4059 4060The @var{dir} parameter tells QEMU where to find the keys file. 4061It is called ``@var{dir}/keys.psk'' and contains ``username:key'' 4062pairs. This file can most easily be created using the GnuTLS 4063@code{psktool} program. 4064 4065For server endpoints, @var{dir} may also contain a file 4066@var{dh-params.pem} providing diffie-hellman parameters to use 4067for the TLS server. If the file is missing, QEMU will generate 4068a set of DH parameters at startup. This is a computationally 4069expensive operation that consumes random pool entropy, so it is 4070recommended that a persistent set of parameters be generated 4071up front and saved. 4072 4073@item -object tls-creds-x509,id=@var{id},endpoint=@var{endpoint},dir=@var{/path/to/cred/dir},priority=@var{priority},verify-peer=@var{on|off},passwordid=@var{id} 4074 4075Creates a TLS anonymous credentials object, which can be used to provide 4076TLS support on network backends. The @option{id} parameter is a unique 4077ID which network backends will use to access the credentials. The 4078@option{endpoint} is either @option{server} or @option{client} depending 4079on whether the QEMU network backend that uses the credentials will be 4080acting as a client or as a server. If @option{verify-peer} is enabled 4081(the default) then once the handshake is completed, the peer credentials 4082will be verified. With x509 certificates, this implies that the clients 4083must be provided with valid client certificates too. 4084 4085The @var{dir} parameter tells QEMU where to find the credential 4086files. For server endpoints, this directory may contain a file 4087@var{dh-params.pem} providing diffie-hellman parameters to use 4088for the TLS server. If the file is missing, QEMU will generate 4089a set of DH parameters at startup. This is a computationally 4090expensive operation that consumes random pool entropy, so it is 4091recommended that a persistent set of parameters be generated 4092upfront and saved. 4093 4094For x509 certificate credentials the directory will contain further files 4095providing the x509 certificates. The certificates must be stored 4096in PEM format, in filenames @var{ca-cert.pem}, @var{ca-crl.pem} (optional), 4097@var{server-cert.pem} (only servers), @var{server-key.pem} (only servers), 4098@var{client-cert.pem} (only clients), and @var{client-key.pem} (only clients). 4099 4100For the @var{server-key.pem} and @var{client-key.pem} files which 4101contain sensitive private keys, it is possible to use an encrypted 4102version by providing the @var{passwordid} parameter. This provides 4103the ID of a previously created @code{secret} object containing the 4104password for decryption. 4105 4106The @var{priority} parameter allows to override the global default 4107priority used by gnutls. This can be useful if the system administrator 4108needs to use a weaker set of crypto priorities for QEMU without 4109potentially forcing the weakness onto all applications. Or conversely 4110if one wants wants a stronger default for QEMU than for all other 4111applications, they can do this through this parameter. Its format is 4112a gnutls priority string as described at 4113@url{https://gnutls.org/manual/html_node/Priority-Strings.html}. 4114 4115@item -object filter-buffer,id=@var{id},netdev=@var{netdevid},interval=@var{t}[,queue=@var{all|rx|tx}][,status=@var{on|off}] 4116 4117Interval @var{t} can't be 0, this filter batches the packet delivery: all 4118packets arriving in a given interval on netdev @var{netdevid} are delayed 4119until the end of the interval. Interval is in microseconds. 4120@option{status} is optional that indicate whether the netfilter is 4121on (enabled) or off (disabled), the default status for netfilter will be 'on'. 4122 4123queue @var{all|rx|tx} is an option that can be applied to any netfilter. 4124 4125@option{all}: the filter is attached both to the receive and the transmit 4126 queue of the netdev (default). 4127 4128@option{rx}: the filter is attached to the receive queue of the netdev, 4129 where it will receive packets sent to the netdev. 4130 4131@option{tx}: the filter is attached to the transmit queue of the netdev, 4132 where it will receive packets sent by the netdev. 4133 4134@item -object filter-mirror,id=@var{id},netdev=@var{netdevid},outdev=@var{chardevid},queue=@var{all|rx|tx}[,vnet_hdr_support] 4135 4136filter-mirror on netdev @var{netdevid},mirror net packet to chardev@var{chardevid}, if it has the vnet_hdr_support flag, filter-mirror will mirror packet with vnet_hdr_len. 4137 4138@item -object filter-redirector,id=@var{id},netdev=@var{netdevid},indev=@var{chardevid},outdev=@var{chardevid},queue=@var{all|rx|tx}[,vnet_hdr_support] 4139 4140filter-redirector on netdev @var{netdevid},redirect filter's net packet to chardev 4141@var{chardevid},and redirect indev's packet to filter.if it has the vnet_hdr_support flag, 4142filter-redirector will redirect packet with vnet_hdr_len. 4143Create a filter-redirector we need to differ outdev id from indev id, id can not 4144be the same. we can just use indev or outdev, but at least one of indev or outdev 4145need to be specified. 4146 4147@item -object filter-rewriter,id=@var{id},netdev=@var{netdevid},queue=@var{all|rx|tx},[vnet_hdr_support] 4148 4149Filter-rewriter is a part of COLO project.It will rewrite tcp packet to 4150secondary from primary to keep secondary tcp connection,and rewrite 4151tcp packet to primary from secondary make tcp packet can be handled by 4152client.if it has the vnet_hdr_support flag, we can parse packet with vnet header. 4153 4154usage: 4155colo secondary: 4156-object filter-redirector,id=f1,netdev=hn0,queue=tx,indev=red0 4157-object filter-redirector,id=f2,netdev=hn0,queue=rx,outdev=red1 4158-object filter-rewriter,id=rew0,netdev=hn0,queue=all 4159 4160@item -object filter-dump,id=@var{id},netdev=@var{dev}[,file=@var{filename}][,maxlen=@var{len}] 4161 4162Dump the network traffic on netdev @var{dev} to the file specified by 4163@var{filename}. At most @var{len} bytes (64k by default) per packet are stored. 4164The file format is libpcap, so it can be analyzed with tools such as tcpdump 4165or Wireshark. 4166 4167@item -object colo-compare,id=@var{id},primary_in=@var{chardevid},secondary_in=@var{chardevid},outdev=@var{chardevid}[,vnet_hdr_support] 4168 4169Colo-compare gets packet from primary_in@var{chardevid} and secondary_in@var{chardevid}, than compare primary packet with 4170secondary packet. If the packets are same, we will output primary 4171packet to outdev@var{chardevid}, else we will notify colo-frame 4172do checkpoint and send primary packet to outdev@var{chardevid}. 4173if it has the vnet_hdr_support flag, colo compare will send/recv packet with vnet_hdr_len. 4174 4175we must use it with the help of filter-mirror and filter-redirector. 4176 4177@example 4178 4179primary: 4180-netdev tap,id=hn0,vhost=off,script=/etc/qemu-ifup,downscript=/etc/qemu-ifdown 4181-device e1000,id=e0,netdev=hn0,mac=52:a4:00:12:78:66 4182-chardev socket,id=mirror0,host=3.3.3.3,port=9003,server,nowait 4183-chardev socket,id=compare1,host=3.3.3.3,port=9004,server,nowait 4184-chardev socket,id=compare0,host=3.3.3.3,port=9001,server,nowait 4185-chardev socket,id=compare0-0,host=3.3.3.3,port=9001 4186-chardev socket,id=compare_out,host=3.3.3.3,port=9005,server,nowait 4187-chardev socket,id=compare_out0,host=3.3.3.3,port=9005 4188-object filter-mirror,id=m0,netdev=hn0,queue=tx,outdev=mirror0 4189-object filter-redirector,netdev=hn0,id=redire0,queue=rx,indev=compare_out 4190-object filter-redirector,netdev=hn0,id=redire1,queue=rx,outdev=compare0 4191-object colo-compare,id=comp0,primary_in=compare0-0,secondary_in=compare1,outdev=compare_out0 4192 4193secondary: 4194-netdev tap,id=hn0,vhost=off,script=/etc/qemu-ifup,down script=/etc/qemu-ifdown 4195-device e1000,netdev=hn0,mac=52:a4:00:12:78:66 4196-chardev socket,id=red0,host=3.3.3.3,port=9003 4197-chardev socket,id=red1,host=3.3.3.3,port=9004 4198-object filter-redirector,id=f1,netdev=hn0,queue=tx,indev=red0 4199-object filter-redirector,id=f2,netdev=hn0,queue=rx,outdev=red1 4200 4201@end example 4202 4203If you want to know the detail of above command line, you can read 4204the colo-compare git log. 4205 4206@item -object cryptodev-backend-builtin,id=@var{id}[,queues=@var{queues}] 4207 4208Creates a cryptodev backend which executes crypto opreation from 4209the QEMU cipher APIS. The @var{id} parameter is 4210a unique ID that will be used to reference this cryptodev backend from 4211the @option{virtio-crypto} device. The @var{queues} parameter is optional, 4212which specify the queue number of cryptodev backend, the default of 4213@var{queues} is 1. 4214 4215@example 4216 4217 # qemu-system-x86_64 \ 4218 [...] \ 4219 -object cryptodev-backend-builtin,id=cryptodev0 \ 4220 -device virtio-crypto-pci,id=crypto0,cryptodev=cryptodev0 \ 4221 [...] 4222@end example 4223 4224@item -object cryptodev-vhost-user,id=@var{id},chardev=@var{chardevid}[,queues=@var{queues}] 4225 4226Creates a vhost-user cryptodev backend, backed by a chardev @var{chardevid}. 4227The @var{id} parameter is a unique ID that will be used to reference this 4228cryptodev backend from the @option{virtio-crypto} device. 4229The chardev should be a unix domain socket backed one. The vhost-user uses 4230a specifically defined protocol to pass vhost ioctl replacement messages 4231to an application on the other end of the socket. 4232The @var{queues} parameter is optional, which specify the queue number 4233of cryptodev backend for multiqueue vhost-user, the default of @var{queues} is 1. 4234 4235@example 4236 4237 # qemu-system-x86_64 \ 4238 [...] \ 4239 -chardev socket,id=chardev0,path=/path/to/socket \ 4240 -object cryptodev-vhost-user,id=cryptodev0,chardev=chardev0 \ 4241 -device virtio-crypto-pci,id=crypto0,cryptodev=cryptodev0 \ 4242 [...] 4243@end example 4244 4245@item -object secret,id=@var{id},data=@var{string},format=@var{raw|base64}[,keyid=@var{secretid},iv=@var{string}] 4246@item -object secret,id=@var{id},file=@var{filename},format=@var{raw|base64}[,keyid=@var{secretid},iv=@var{string}] 4247 4248Defines a secret to store a password, encryption key, or some other sensitive 4249data. The sensitive data can either be passed directly via the @var{data} 4250parameter, or indirectly via the @var{file} parameter. Using the @var{data} 4251parameter is insecure unless the sensitive data is encrypted. 4252 4253The sensitive data can be provided in raw format (the default), or base64. 4254When encoded as JSON, the raw format only supports valid UTF-8 characters, 4255so base64 is recommended for sending binary data. QEMU will convert from 4256which ever format is provided to the format it needs internally. eg, an 4257RBD password can be provided in raw format, even though it will be base64 4258encoded when passed onto the RBD sever. 4259 4260For added protection, it is possible to encrypt the data associated with 4261a secret using the AES-256-CBC cipher. Use of encryption is indicated 4262by providing the @var{keyid} and @var{iv} parameters. The @var{keyid} 4263parameter provides the ID of a previously defined secret that contains 4264the AES-256 decryption key. This key should be 32-bytes long and be 4265base64 encoded. The @var{iv} parameter provides the random initialization 4266vector used for encryption of this particular secret and should be a 4267base64 encrypted string of the 16-byte IV. 4268 4269The simplest (insecure) usage is to provide the secret inline 4270 4271@example 4272 4273 # $QEMU -object secret,id=sec0,data=letmein,format=raw 4274 4275@end example 4276 4277The simplest secure usage is to provide the secret via a file 4278 4279 # printf "letmein" > mypasswd.txt 4280 # $QEMU -object secret,id=sec0,file=mypasswd.txt,format=raw 4281 4282For greater security, AES-256-CBC should be used. To illustrate usage, 4283consider the openssl command line tool which can encrypt the data. Note 4284that when encrypting, the plaintext must be padded to the cipher block 4285size (32 bytes) using the standard PKCS#5/6 compatible padding algorithm. 4286 4287First a master key needs to be created in base64 encoding: 4288 4289@example 4290 # openssl rand -base64 32 > key.b64 4291 # KEY=$(base64 -d key.b64 | hexdump -v -e '/1 "%02X"') 4292@end example 4293 4294Each secret to be encrypted needs to have a random initialization vector 4295generated. These do not need to be kept secret 4296 4297@example 4298 # openssl rand -base64 16 > iv.b64 4299 # IV=$(base64 -d iv.b64 | hexdump -v -e '/1 "%02X"') 4300@end example 4301 4302The secret to be defined can now be encrypted, in this case we're 4303telling openssl to base64 encode the result, but it could be left 4304as raw bytes if desired. 4305 4306@example 4307 # SECRET=$(printf "letmein" | 4308 openssl enc -aes-256-cbc -a -K $KEY -iv $IV) 4309@end example 4310 4311When launching QEMU, create a master secret pointing to @code{key.b64} 4312and specify that to be used to decrypt the user password. Pass the 4313contents of @code{iv.b64} to the second secret 4314 4315@example 4316 # $QEMU \ 4317 -object secret,id=secmaster0,format=base64,file=key.b64 \ 4318 -object secret,id=sec0,keyid=secmaster0,format=base64,\ 4319 data=$SECRET,iv=$(<iv.b64) 4320@end example 4321 4322@item -object sev-guest,id=@var{id},cbitpos=@var{cbitpos},reduced-phys-bits=@var{val},[sev-device=@var{string},policy=@var{policy},handle=@var{handle},dh-cert-file=@var{file},session-file=@var{file}] 4323 4324Create a Secure Encrypted Virtualization (SEV) guest object, which can be used 4325to provide the guest memory encryption support on AMD processors. 4326 4327When memory encryption is enabled, one of the physical address bit (aka the 4328C-bit) is utilized to mark if a memory page is protected. The @option{cbitpos} 4329is used to provide the C-bit position. The C-bit position is Host family dependent 4330hence user must provide this value. On EPYC, the value should be 47. 4331 4332When memory encryption is enabled, we loose certain bits in physical address space. 4333The @option{reduced-phys-bits} is used to provide the number of bits we loose in 4334physical address space. Similar to C-bit, the value is Host family dependent. 4335On EPYC, the value should be 5. 4336 4337The @option{sev-device} provides the device file to use for communicating with 4338the SEV firmware running inside AMD Secure Processor. The default device is 4339'/dev/sev'. If hardware supports memory encryption then /dev/sev devices are 4340created by CCP driver. 4341 4342The @option{policy} provides the guest policy to be enforced by the SEV firmware 4343and restrict what configuration and operational commands can be performed on this 4344guest by the hypervisor. The policy should be provided by the guest owner and is 4345bound to the guest and cannot be changed throughout the lifetime of the guest. 4346The default is 0. 4347 4348If guest @option{policy} allows sharing the key with another SEV guest then 4349@option{handle} can be use to provide handle of the guest from which to share 4350the key. 4351 4352The @option{dh-cert-file} and @option{session-file} provides the guest owner's 4353Public Diffie-Hillman key defined in SEV spec. The PDH and session parameters 4354are used for establishing a cryptographic session with the guest owner to 4355negotiate keys used for attestation. The file must be encoded in base64. 4356 4357e.g to launch a SEV guest 4358@example 4359 # $QEMU \ 4360 ...... 4361 -object sev-guest,id=sev0,cbitpos=47,reduced-phys-bits=5 \ 4362 -machine ...,memory-encryption=sev0 4363 ..... 4364 4365@end example 4366@end table 4367 4368ETEXI 4369 4370 4371HXCOMM This is the last statement. Insert new options before this line! 4372STEXI 4373@end table 4374ETEXI 4375
