qemu-options.hx 177 KB
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HXCOMM Use DEFHEADING() to define headings in both help text and texi
HXCOMM Text between STEXI and ETEXI are copied to texi version and
HXCOMM discarded from C version
HXCOMM DEF(option, HAS_ARG/0, opt_enum, opt_help, arch_mask) is used to
HXCOMM construct option structures, enums and help message for specified
HXCOMM architectures.
HXCOMM HXCOMM can be used for comments, discarded from both texi and C

DEFHEADING(Standard options:)
STEXI
@table @option
ETEXI

DEF("help", 0, QEMU_OPTION_h,
    "-h or -help     display this help and exit\n", QEMU_ARCH_ALL)
STEXI
@item -h
@findex -h
Display help and exit
ETEXI

DEF("version", 0, QEMU_OPTION_version,
    "-version        display version information and exit\n", QEMU_ARCH_ALL)
STEXI
@item -version
@findex -version
Display version information and exit
ETEXI

DEF("machine", HAS_ARG, QEMU_OPTION_machine, \
    "-machine [type=]name[,prop[=value][,...]]\n"
    "                selects emulated machine ('-machine help' for list)\n"
    "                property accel=accel1[:accel2[:...]] selects accelerator\n"
    "                supported accelerators are kvm, xen, hax, hvf, whpx or tcg (default: tcg)\n"
    "                kernel_irqchip=on|off|split controls accelerated irqchip support (default=off)\n"
    "                vmport=on|off|auto controls emulation of vmport (default: auto)\n"
    "                kvm_shadow_mem=size of KVM shadow MMU in bytes\n"
    "                dump-guest-core=on|off include guest memory in a core dump (default=on)\n"
    "                mem-merge=on|off controls memory merge support (default: on)\n"
    "                igd-passthru=on|off controls IGD GFX passthrough support (default=off)\n"
    "                aes-key-wrap=on|off controls support for AES key wrapping (default=on)\n"
    "                dea-key-wrap=on|off controls support for DEA key wrapping (default=on)\n"
    "                suppress-vmdesc=on|off disables self-describing migration (default=off)\n"
    "                nvdimm=on|off controls NVDIMM support (default=off)\n"
    "                enforce-config-section=on|off enforce configuration section migration (default=off)\n"
    "                s390-squash-mcss=on|off (deprecated) controls support for squashing into default css (default=off)\n"
    "                memory-encryption=@var{} memory encryption object to use (default=none)\n",
    QEMU_ARCH_ALL)
STEXI
@item -machine [type=]@var{name}[,prop=@var{value}[,...]]
@findex -machine
Select the emulated machine by @var{name}. Use @code{-machine help} to list
available machines.

For architectures which aim to support live migration compatibility
across releases, each release will introduce a new versioned machine
type. For example, the 2.8.0 release introduced machine types
``pc-i440fx-2.8'' and ``pc-q35-2.8'' for the x86_64/i686 architectures.

To allow live migration of guests from QEMU version 2.8.0, to QEMU
version 2.9.0, the 2.9.0 version must support the ``pc-i440fx-2.8''
and ``pc-q35-2.8'' machines too. To allow users live migrating VMs
to skip multiple intermediate releases when upgrading, new releases
of QEMU will support machine types from many previous versions.

Supported machine properties are:
@table @option
@item accel=@var{accels1}[:@var{accels2}[:...]]
This is used to enable an accelerator. Depending on the target architecture,
kvm, xen, hax, hvf, whpx or tcg can be available. By default, tcg is used. If there is
more than one accelerator specified, the next one is used if the previous one
fails to initialize.
@item kernel_irqchip=on|off
Controls in-kernel irqchip support for the chosen accelerator when available.
@item gfx_passthru=on|off
Enables IGD GFX passthrough support for the chosen machine when available.
@item vmport=on|off|auto
Enables emulation of VMWare IO port, for vmmouse etc. auto says to select the
value based on accel. For accel=xen the default is off otherwise the default
is on.
@item kvm_shadow_mem=size
Defines the size of the KVM shadow MMU.
@item dump-guest-core=on|off
Include guest memory in a core dump. The default is on.
@item mem-merge=on|off
Enables or disables memory merge support. This feature, when supported by
the host, de-duplicates identical memory pages among VMs instances
(enabled by default).
@item aes-key-wrap=on|off
Enables or disables AES key wrapping support on s390-ccw hosts. This feature
controls whether AES wrapping keys will be created to allow
execution of AES cryptographic functions.  The default is on.
@item dea-key-wrap=on|off
Enables or disables DEA key wrapping support on s390-ccw hosts. This feature
controls whether DEA wrapping keys will be created to allow
execution of DEA cryptographic functions.  The default is on.
@item nvdimm=on|off
Enables or disables NVDIMM support. The default is off.
@item s390-squash-mcss=on|off
Enables or disables squashing subchannels into the default css.
The default is off.
NOTE: This property is deprecated and will be removed in future releases.
The ``s390-squash-mcss=on`` property has been obsoleted by allowing the
cssid to be chosen freely. Instead of squashing subchannels into the
default channel subsystem image for guests that do not support multiple
channel subsystems, all devices can be put into the default channel
subsystem image.
@item enforce-config-section=on|off
If @option{enforce-config-section} is set to @var{on}, force migration
code to send configuration section even if the machine-type sets the
@option{migration.send-configuration} property to @var{off}.
NOTE: this parameter is deprecated. Please use @option{-global}
@option{migration.send-configuration}=@var{on|off} instead.
@item memory-encryption=@var{}
Memory encryption object to use. The default is none.
@end table
ETEXI

HXCOMM Deprecated by -machine
DEF("M", HAS_ARG, QEMU_OPTION_M, "", QEMU_ARCH_ALL)

DEF("cpu", HAS_ARG, QEMU_OPTION_cpu,
    "-cpu cpu        select CPU ('-cpu help' for list)\n", QEMU_ARCH_ALL)
STEXI
@item -cpu @var{model}
@findex -cpu
Select CPU model (@code{-cpu help} for list and additional feature selection)
ETEXI

DEF("accel", HAS_ARG, QEMU_OPTION_accel,
    "-accel [accel=]accelerator[,thread=single|multi]\n"
    "                select accelerator (kvm, xen, hax, hvf, whpx or tcg; use 'help' for a list)\n"
    "                thread=single|multi (enable multi-threaded TCG)\n", QEMU_ARCH_ALL)
STEXI
@item -accel @var{name}[,prop=@var{value}[,...]]
@findex -accel
This is used to enable an accelerator. Depending on the target architecture,
kvm, xen, hax, hvf, whpx or tcg can be available. By default, tcg is used. If there is
more than one accelerator specified, the next one is used if the previous one
fails to initialize.
@table @option
@item thread=single|multi
Controls number of TCG threads. When the TCG is multi-threaded there will be one
thread per vCPU therefor taking advantage of additional host cores. The default
is to enable multi-threading where both the back-end and front-ends support it and
no incompatible TCG features have been enabled (e.g. icount/replay).
@end table
ETEXI

DEF("smp", HAS_ARG, QEMU_OPTION_smp,
    "-smp [cpus=]n[,maxcpus=cpus][,cores=cores][,threads=threads][,sockets=sockets]\n"
    "                set the number of CPUs to 'n' [default=1]\n"
    "                maxcpus= maximum number of total cpus, including\n"
    "                offline CPUs for hotplug, etc\n"
    "                cores= number of CPU cores on one socket\n"
    "                threads= number of threads on one CPU core\n"
    "                sockets= number of discrete sockets in the system\n",
        QEMU_ARCH_ALL)
STEXI
@item -smp [cpus=]@var{n}[,cores=@var{cores}][,threads=@var{threads}][,sockets=@var{sockets}][,maxcpus=@var{maxcpus}]
@findex -smp
Simulate an SMP system with @var{n} CPUs. On the PC target, up to 255
CPUs are supported. On Sparc32 target, Linux limits the number of usable CPUs
to 4.
For the PC target, the number of @var{cores} per socket, the number
of @var{threads} per cores and the total number of @var{sockets} can be
specified. Missing values will be computed. If any on the three values is
given, the total number of CPUs @var{n} can be omitted. @var{maxcpus}
specifies the maximum number of hotpluggable CPUs.
ETEXI

DEF("numa", HAS_ARG, QEMU_OPTION_numa,
    "-numa node[,mem=size][,cpus=firstcpu[-lastcpu]][,nodeid=node]\n"
    "-numa node[,memdev=id][,cpus=firstcpu[-lastcpu]][,nodeid=node]\n"
    "-numa dist,src=source,dst=destination,val=distance\n"
    "-numa cpu,node-id=node[,socket-id=x][,core-id=y][,thread-id=z]\n",
    QEMU_ARCH_ALL)
STEXI
@item -numa node[,mem=@var{size}][,cpus=@var{firstcpu}[-@var{lastcpu}]][,nodeid=@var{node}]
@itemx -numa node[,memdev=@var{id}][,cpus=@var{firstcpu}[-@var{lastcpu}]][,nodeid=@var{node}]
@itemx -numa dist,src=@var{source},dst=@var{destination},val=@var{distance}
@itemx -numa cpu,node-id=@var{node}[,socket-id=@var{x}][,core-id=@var{y}][,thread-id=@var{z}]
@findex -numa
Define a NUMA node and assign RAM and VCPUs to it.
Set the NUMA distance from a source node to a destination node.

Legacy VCPU assignment uses @samp{cpus} option where
@var{firstcpu} and @var{lastcpu} are CPU indexes. Each
@samp{cpus} option represent a contiguous range of CPU indexes
(or a single VCPU if @var{lastcpu} is omitted). A non-contiguous
set of VCPUs can be represented by providing multiple @samp{cpus}
options. If @samp{cpus} is omitted on all nodes, VCPUs are automatically
split between them.

For example, the following option assigns VCPUs 0, 1, 2 and 5 to
a NUMA node:
@example
-numa node,cpus=0-2,cpus=5
@end example

@samp{cpu} option is a new alternative to @samp{cpus} option
which uses @samp{socket-id|core-id|thread-id} properties to assign
CPU objects to a @var{node} using topology layout properties of CPU.
The set of properties is machine specific, and depends on used
machine type/@samp{smp} options. It could be queried with
@samp{hotpluggable-cpus} monitor command.
@samp{node-id} property specifies @var{node} to which CPU object
will be assigned, it's required for @var{node} to be declared
with @samp{node} option before it's used with @samp{cpu} option.

For example:
@example
-M pc \
-smp 1,sockets=2,maxcpus=2 \
-numa node,nodeid=0 -numa node,nodeid=1 \
-numa cpu,node-id=0,socket-id=0 -numa cpu,node-id=1,socket-id=1
@end example

@samp{mem} assigns a given RAM amount to a node. @samp{memdev}
assigns RAM from a given memory backend device to a node. If
@samp{mem} and @samp{memdev} are omitted in all nodes, RAM is
split equally between them.

@samp{mem} and @samp{memdev} are mutually exclusive. Furthermore,
if one node uses @samp{memdev}, all of them have to use it.

@var{source} and @var{destination} are NUMA node IDs.
@var{distance} is the NUMA distance from @var{source} to @var{destination}.
The distance from a node to itself is always 10. If any pair of nodes is
given a distance, then all pairs must be given distances. Although, when
distances are only given in one direction for each pair of nodes, then
the distances in the opposite directions are assumed to be the same. If,
however, an asymmetrical pair of distances is given for even one node
pair, then all node pairs must be provided distance values for both
directions, even when they are symmetrical. When a node is unreachable
from another node, set the pair's distance to 255.

Note that the -@option{numa} option doesn't allocate any of the
specified resources, it just assigns existing resources to NUMA
nodes. This means that one still has to use the @option{-m},
@option{-smp} options to allocate RAM and VCPUs respectively.

ETEXI

DEF("add-fd", HAS_ARG, QEMU_OPTION_add_fd,
    "-add-fd fd=fd,set=set[,opaque=opaque]\n"
    "                Add 'fd' to fd 'set'\n", QEMU_ARCH_ALL)
STEXI
@item -add-fd fd=@var{fd},set=@var{set}[,opaque=@var{opaque}]
@findex -add-fd

Add a file descriptor to an fd set.  Valid options are:

@table @option
@item fd=@var{fd}
This option defines the file descriptor of which a duplicate is added to fd set.
The file descriptor cannot be stdin, stdout, or stderr.
@item set=@var{set}
This option defines the ID of the fd set to add the file descriptor to.
@item opaque=@var{opaque}
This option defines a free-form string that can be used to describe @var{fd}.
@end table

You can open an image using pre-opened file descriptors from an fd set:
@example
qemu-system-i386
-add-fd fd=3,set=2,opaque="rdwr:/path/to/file"
-add-fd fd=4,set=2,opaque="rdonly:/path/to/file"
-drive file=/dev/fdset/2,index=0,media=disk
@end example
ETEXI

DEF("set", HAS_ARG, QEMU_OPTION_set,
    "-set group.id.arg=value\n"
    "                set <arg> parameter for item <id> of type <group>\n"
    "                i.e. -set drive.$id.file=/path/to/image\n", QEMU_ARCH_ALL)
STEXI
@item -set @var{group}.@var{id}.@var{arg}=@var{value}
@findex -set
Set parameter @var{arg} for item @var{id} of type @var{group}
ETEXI

DEF("global", HAS_ARG, QEMU_OPTION_global,
    "-global driver.property=value\n"
    "-global driver=driver,property=property,value=value\n"
    "                set a global default for a driver property\n",
    QEMU_ARCH_ALL)
STEXI
@item -global @var{driver}.@var{prop}=@var{value}
@itemx -global driver=@var{driver},property=@var{property},value=@var{value}
@findex -global
Set default value of @var{driver}'s property @var{prop} to @var{value}, e.g.:

@example
qemu-system-i386 -global ide-hd.physical_block_size=4096 disk-image.img
@end example

In particular, you can use this to set driver properties for devices which are
created automatically by the machine model. To create a device which is not
created automatically and set properties on it, use -@option{device}.

-global @var{driver}.@var{prop}=@var{value} is shorthand for -global
driver=@var{driver},property=@var{prop},value=@var{value}.  The
longhand syntax works even when @var{driver} contains a dot.
ETEXI

DEF("boot", HAS_ARG, QEMU_OPTION_boot,
    "-boot [order=drives][,once=drives][,menu=on|off]\n"
    "      [,splash=sp_name][,splash-time=sp_time][,reboot-timeout=rb_time][,strict=on|off]\n"
    "                'drives': floppy (a), hard disk (c), CD-ROM (d), network (n)\n"
    "                'sp_name': the file's name that would be passed to bios as logo picture, if menu=on\n"
    "                'sp_time': the period that splash picture last if menu=on, unit is ms\n"
    "                'rb_timeout': the timeout before guest reboot when boot failed, unit is ms\n",
    QEMU_ARCH_ALL)
STEXI
@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]
@findex -boot
Specify boot order @var{drives} as a string of drive letters. Valid
drive letters depend on the target architecture. The x86 PC uses: a, b
(floppy 1 and 2), c (first hard disk), d (first CD-ROM), n-p (Etherboot
from network adapter 1-4), hard disk boot is the default. To apply a
particular boot order only on the first startup, specify it via
@option{once}. Note that the @option{order} or @option{once} parameter
should not be used together with the @option{bootindex} property of
devices, since the firmware implementations normally do not support both
at the same time.

Interactive boot menus/prompts can be enabled via @option{menu=on} as far
as firmware/BIOS supports them. The default is non-interactive boot.

A splash picture could be passed to bios, enabling user to show it as logo,
when option splash=@var{sp_name} is given and menu=on, If firmware/BIOS
supports them. Currently Seabios for X86 system support it.
limitation: The splash file could be a jpeg file or a BMP file in 24 BPP
format(true color). The resolution should be supported by the SVGA mode, so
the recommended is 320x240, 640x480, 800x640.

A timeout could be passed to bios, guest will pause for @var{rb_timeout} ms
when boot failed, then reboot. If @var{rb_timeout} is '-1', guest will not
reboot, qemu passes '-1' to bios by default. Currently Seabios for X86
system support it.

Do strict boot via @option{strict=on} as far as firmware/BIOS
supports it. This only effects when boot priority is changed by
bootindex options. The default is non-strict boot.

@example
# try to boot from network first, then from hard disk
qemu-system-i386 -boot order=nc
# boot from CD-ROM first, switch back to default order after reboot
qemu-system-i386 -boot once=d
# boot with a splash picture for 5 seconds.
qemu-system-i386 -boot menu=on,splash=/root/boot.bmp,splash-time=5000
@end example

Note: The legacy format '-boot @var{drives}' is still supported but its
use is discouraged as it may be removed from future versions.
ETEXI

DEF("m", HAS_ARG, QEMU_OPTION_m,
    "-m [size=]megs[,slots=n,maxmem=size]\n"
    "                configure guest RAM\n"
    "                size: initial amount of guest memory\n"
    "                slots: number of hotplug slots (default: none)\n"
    "                maxmem: maximum amount of guest memory (default: none)\n"
    "NOTE: Some architectures might enforce a specific granularity\n",
    QEMU_ARCH_ALL)
STEXI
@item -m [size=]@var{megs}[,slots=n,maxmem=size]
@findex -m
Sets guest startup RAM size to @var{megs} megabytes. Default is 128 MiB.
Optionally, a suffix of ``M'' or ``G'' can be used to signify a value in
megabytes or gigabytes respectively. Optional pair @var{slots}, @var{maxmem}
could be used to set amount of hotpluggable memory slots and maximum amount of
memory. Note that @var{maxmem} must be aligned to the page size.

For example, the following command-line sets the guest startup RAM size to
1GB, creates 3 slots to hotplug additional memory and sets the maximum
memory the guest can reach to 4GB:

@example
qemu-system-x86_64 -m 1G,slots=3,maxmem=4G
@end example

If @var{slots} and @var{maxmem} are not specified, memory hotplug won't
be enabled and the guest startup RAM will never increase.
ETEXI

DEF("mem-path", HAS_ARG, QEMU_OPTION_mempath,
    "-mem-path FILE  provide backing storage for guest RAM\n", QEMU_ARCH_ALL)
STEXI
@item -mem-path @var{path}
@findex -mem-path
Allocate guest RAM from a temporarily created file in @var{path}.
ETEXI

DEF("mem-prealloc", 0, QEMU_OPTION_mem_prealloc,
    "-mem-prealloc   preallocate guest memory (use with -mem-path)\n",
    QEMU_ARCH_ALL)
STEXI
@item -mem-prealloc
@findex -mem-prealloc
Preallocate memory when using -mem-path.
ETEXI

DEF("k", HAS_ARG, QEMU_OPTION_k,
    "-k language     use keyboard layout (for example 'fr' for French)\n",
    QEMU_ARCH_ALL)
STEXI
@item -k @var{language}
@findex -k
Use keyboard layout @var{language} (for example @code{fr} for
French). This option is only needed where it is not easy to get raw PC
keycodes (e.g. on Macs, with some X11 servers or with a VNC or curses
display). You don't normally need to use it on PC/Linux or PC/Windows
hosts.

The available layouts are:
@example
ar  de-ch  es  fo     fr-ca  hu  ja  mk     no  pt-br  sv
da  en-gb  et  fr     fr-ch  is  lt  nl     pl  ru     th
de  en-us  fi  fr-be  hr     it  lv  nl-be  pt  sl     tr
@end example

The default is @code{en-us}.
ETEXI


DEF("audio-help", 0, QEMU_OPTION_audio_help,
    "-audio-help     print list of audio drivers and their options\n",
    QEMU_ARCH_ALL)
STEXI
@item -audio-help
@findex -audio-help
Will show the audio subsystem help: list of drivers, tunable
parameters.
ETEXI

DEF("soundhw", HAS_ARG, QEMU_OPTION_soundhw,
    "-soundhw c1,... enable audio support\n"
    "                and only specified sound cards (comma separated list)\n"
    "                use '-soundhw help' to get the list of supported cards\n"
    "                use '-soundhw all' to enable all of them\n", QEMU_ARCH_ALL)
STEXI
@item -soundhw @var{card1}[,@var{card2},...] or -soundhw all
@findex -soundhw
Enable audio and selected sound hardware. Use 'help' to print all
available sound hardware.

@example
qemu-system-i386 -soundhw sb16,adlib disk.img
qemu-system-i386 -soundhw es1370 disk.img
qemu-system-i386 -soundhw ac97 disk.img
qemu-system-i386 -soundhw hda disk.img
qemu-system-i386 -soundhw all disk.img
qemu-system-i386 -soundhw help
@end example

Note that Linux's i810_audio OSS kernel (for AC97) module might
require manually specifying clocking.

@example
modprobe i810_audio clocking=48000
@end example
ETEXI

DEF("balloon", HAS_ARG, QEMU_OPTION_balloon,
    "-balloon virtio[,addr=str]\n"
    "                enable virtio balloon device (deprecated)\n", QEMU_ARCH_ALL)
STEXI
@item -balloon virtio[,addr=@var{addr}]
@findex -balloon
Enable virtio balloon device, optionally with PCI address @var{addr}. This
option is deprecated, use @option{-device virtio-balloon} instead.
ETEXI

DEF("device", HAS_ARG, QEMU_OPTION_device,
    "-device driver[,prop[=value][,...]]\n"
    "                add device (based on driver)\n"
    "                prop=value,... sets driver properties\n"
    "                use '-device help' to print all possible drivers\n"
    "                use '-device driver,help' to print all possible properties\n",
    QEMU_ARCH_ALL)
STEXI
@item -device @var{driver}[,@var{prop}[=@var{value}][,...]]
@findex -device
Add device @var{driver}.  @var{prop}=@var{value} sets driver
properties.  Valid properties depend on the driver.  To get help on
possible drivers and properties, use @code{-device help} and
@code{-device @var{driver},help}.

Some drivers are:
@item -device ipmi-bmc-sim,id=@var{id}[,slave_addr=@var{val}][,sdrfile=@var{file}][,furareasize=@var{val}][,furdatafile=@var{file}]

Add an IPMI BMC.  This is a simulation of a hardware management
interface processor that normally sits on a system.  It provides
a watchdog and the ability to reset and power control the system.
You need to connect this to an IPMI interface to make it useful

The IPMI slave address to use for the BMC.  The default is 0x20.
This address is the BMC's address on the I2C network of management
controllers.  If you don't know what this means, it is safe to ignore
it.

@table @option
@item bmc=@var{id}
The BMC to connect to, one of ipmi-bmc-sim or ipmi-bmc-extern above.
@item slave_addr=@var{val}
Define slave address to use for the BMC.  The default is 0x20.
@item sdrfile=@var{file}
file containing raw Sensor Data Records (SDR) data. The default is none.
@item fruareasize=@var{val}
size of a Field Replaceable Unit (FRU) area.  The default is 1024.
@item frudatafile=@var{file}
file containing raw Field Replaceable Unit (FRU) inventory data. The default is none.
@end table

@item -device ipmi-bmc-extern,id=@var{id},chardev=@var{id}[,slave_addr=@var{val}]

Add a connection to an external IPMI BMC simulator.  Instead of
locally emulating the BMC like the above item, instead connect
to an external entity that provides the IPMI services.

A connection is made to an external BMC simulator.  If you do this, it
is strongly recommended that you use the "reconnect=" chardev option
to reconnect to the simulator if the connection is lost.  Note that if
this is not used carefully, it can be a security issue, as the
interface has the ability to send resets, NMIs, and power off the VM.
It's best if QEMU makes a connection to an external simulator running
on a secure port on localhost, so neither the simulator nor QEMU is
exposed to any outside network.

See the "lanserv/README.vm" file in the OpenIPMI library for more
details on the external interface.

@item -device isa-ipmi-kcs,bmc=@var{id}[,ioport=@var{val}][,irq=@var{val}]

Add a KCS IPMI interafce on the ISA bus.  This also adds a
corresponding ACPI and SMBIOS entries, if appropriate.

@table @option
@item bmc=@var{id}
The BMC to connect to, one of ipmi-bmc-sim or ipmi-bmc-extern above.
@item ioport=@var{val}
Define the I/O address of the interface.  The default is 0xca0 for KCS.
@item irq=@var{val}
Define the interrupt to use.  The default is 5.  To disable interrupts,
set this to 0.
@end table

@item -device isa-ipmi-bt,bmc=@var{id}[,ioport=@var{val}][,irq=@var{val}]

Like the KCS interface, but defines a BT interface.  The default port is
0xe4 and the default interrupt is 5.

ETEXI

DEF("name", HAS_ARG, QEMU_OPTION_name,
    "-name string1[,process=string2][,debug-threads=on|off]\n"
    "                set the name of the guest\n"
    "                string1 sets the window title and string2 the process name (on Linux)\n"
    "                When debug-threads is enabled, individual threads are given a separate name (on Linux)\n"
    "                NOTE: The thread names are for debugging and not a stable API.\n",
    QEMU_ARCH_ALL)
STEXI
@item -name @var{name}
@findex -name
Sets the @var{name} of the guest.
This name will be displayed in the SDL window caption.
The @var{name} will also be used for the VNC server.
Also optionally set the top visible process name in Linux.
Naming of individual threads can also be enabled on Linux to aid debugging.
ETEXI

DEF("uuid", HAS_ARG, QEMU_OPTION_uuid,
    "-uuid %08x-%04x-%04x-%04x-%012x\n"
    "                specify machine UUID\n", QEMU_ARCH_ALL)
STEXI
@item -uuid @var{uuid}
@findex -uuid
Set system UUID.
ETEXI

STEXI
@end table
ETEXI
DEFHEADING()

DEFHEADING(Block device options:)
STEXI
@table @option
ETEXI

DEF("fda", HAS_ARG, QEMU_OPTION_fda,
    "-fda/-fdb file  use 'file' as floppy disk 0/1 image\n", QEMU_ARCH_ALL)
DEF("fdb", HAS_ARG, QEMU_OPTION_fdb, "", QEMU_ARCH_ALL)
STEXI
@item -fda @var{file}
@itemx -fdb @var{file}
@findex -fda
@findex -fdb
Use @var{file} as floppy disk 0/1 image (@pxref{disk_images}).
ETEXI

DEF("hda", HAS_ARG, QEMU_OPTION_hda,
    "-hda/-hdb file  use 'file' as IDE hard disk 0/1 image\n", QEMU_ARCH_ALL)
DEF("hdb", HAS_ARG, QEMU_OPTION_hdb, "", QEMU_ARCH_ALL)
DEF("hdc", HAS_ARG, QEMU_OPTION_hdc,
    "-hdc/-hdd file  use 'file' as IDE hard disk 2/3 image\n", QEMU_ARCH_ALL)
DEF("hdd", HAS_ARG, QEMU_OPTION_hdd, "", QEMU_ARCH_ALL)
STEXI
@item -hda @var{file}
@itemx -hdb @var{file}
@itemx -hdc @var{file}
@itemx -hdd @var{file}
@findex -hda
@findex -hdb
@findex -hdc
@findex -hdd
Use @var{file} as hard disk 0, 1, 2 or 3 image (@pxref{disk_images}).
ETEXI

DEF("cdrom", HAS_ARG, QEMU_OPTION_cdrom,
    "-cdrom file     use 'file' as IDE cdrom image (cdrom is ide1 master)\n",
    QEMU_ARCH_ALL)
STEXI
@item -cdrom @var{file}
@findex -cdrom
Use @var{file} as CD-ROM image (you cannot use @option{-hdc} and
@option{-cdrom} at the same time). You can use the host CD-ROM by
using @file{/dev/cdrom} as filename (@pxref{host_drives}).
ETEXI

DEF("blockdev", HAS_ARG, QEMU_OPTION_blockdev,
    "-blockdev [driver=]driver[,node-name=N][,discard=ignore|unmap]\n"
    "          [,cache.direct=on|off][,cache.no-flush=on|off]\n"
    "          [,read-only=on|off][,detect-zeroes=on|off|unmap]\n"
    "          [,driver specific parameters...]\n"
    "                configure a block backend\n", QEMU_ARCH_ALL)
STEXI
@item -blockdev @var{option}[,@var{option}[,@var{option}[,...]]]
@findex -blockdev

Define a new block driver node. Some of the options apply to all block drivers,
other options are only accepted for a specific block driver. See below for a
list of generic options and options for the most common block drivers.

Options that expect a reference to another node (e.g. @code{file}) can be
given in two ways. Either you specify the node name of an already existing node
(file=@var{node-name}), or you define a new node inline, adding options
for the referenced node after a dot (file.filename=@var{path},file.aio=native).

A block driver node created with @option{-blockdev} can be used for a guest
device by specifying its node name for the @code{drive} property in a
@option{-device} argument that defines a block device.

@table @option
@item Valid options for any block driver node:

@table @code
@item driver
Specifies the block driver to use for the given node.
@item node-name
This defines the name of the block driver node by which it will be referenced
later. The name must be unique, i.e. it must not match the name of a different
block driver node, or (if you use @option{-drive} as well) the ID of a drive.

If no node name is specified, it is automatically generated. The generated node
name is not intended to be predictable and changes between QEMU invocations.
For the top level, an explicit node name must be specified.
@item read-only
Open the node read-only. Guest write attempts will fail.
@item cache.direct
The host page cache can be avoided with @option{cache.direct=on}. This will
attempt to do disk IO directly to the guest's memory. QEMU may still perform an
internal copy of the data.
@item cache.no-flush
In case you don't care about data integrity over host failures, you can use
@option{cache.no-flush=on}. This option tells QEMU that it never needs to write
any data to the disk but can instead keep things in cache. If anything goes
wrong, like your host losing power, the disk storage getting disconnected
accidentally, etc. your image will most probably be rendered unusable.
@item discard=@var{discard}
@var{discard} is one of "ignore" (or "off") or "unmap" (or "on") and controls
whether @code{discard} (also known as @code{trim} or @code{unmap}) requests are
ignored or passed to the filesystem. Some machine types may not support
discard requests.
@item detect-zeroes=@var{detect-zeroes}
@var{detect-zeroes} is "off", "on" or "unmap" and enables the automatic
conversion of plain zero writes by the OS to driver specific optimized
zero write commands. You may even choose "unmap" if @var{discard} is set
to "unmap" to allow a zero write to be converted to an @code{unmap} operation.
@end table

@item Driver-specific options for @code{file}

This is the protocol-level block driver for accessing regular files.

@table @code
@item filename
The path to the image file in the local filesystem
@item aio
Specifies the AIO backend (threads/native, default: threads)
@item locking
Specifies whether the image file is protected with Linux OFD / POSIX locks. The
default is to use the Linux Open File Descriptor API if available, otherwise no
lock is applied.  (auto/on/off, default: auto)
@end table
Example:
@example
-blockdev driver=file,node-name=disk,filename=disk.img
@end example

@item Driver-specific options for @code{raw}

This is the image format block driver for raw images. It is usually
stacked on top of a protocol level block driver such as @code{file}.

@table @code
@item file
Reference to or definition of the data source block driver node
(e.g. a @code{file} driver node)
@end table
Example 1:
@example
-blockdev driver=file,node-name=disk_file,filename=disk.img
-blockdev driver=raw,node-name=disk,file=disk_file
@end example
Example 2:
@example
-blockdev driver=raw,node-name=disk,file.driver=file,file.filename=disk.img
@end example

@item Driver-specific options for @code{qcow2}

This is the image format block driver for qcow2 images. It is usually
stacked on top of a protocol level block driver such as @code{file}.

@table @code
@item file
Reference to or definition of the data source block driver node
(e.g. a @code{file} driver node)

@item backing
Reference to or definition of the backing file block device (default is taken
from the image file). It is allowed to pass @code{null} here in order to disable
the default backing file.

@item lazy-refcounts
Whether to enable the lazy refcounts feature (on/off; default is taken from the
image file)

@item cache-size
The maximum total size of the L2 table and refcount block caches in bytes
(default: 1048576 bytes or 8 clusters, whichever is larger)

@item l2-cache-size
The maximum size of the L2 table cache in bytes
(default: 4/5 of the total cache size)

@item refcount-cache-size
The maximum size of the refcount block cache in bytes
(default: 1/5 of the total cache size)

@item cache-clean-interval
Clean unused entries in the L2 and refcount caches. The interval is in seconds.
The default value is 0 and it disables this feature.

@item pass-discard-request
Whether discard requests to the qcow2 device should be forwarded to the data
source (on/off; default: on if discard=unmap is specified, off otherwise)

@item pass-discard-snapshot
Whether discard requests for the data source should be issued when a snapshot
operation (e.g. deleting a snapshot) frees clusters in the qcow2 file (on/off;
default: on)

@item pass-discard-other
Whether discard requests for the data source should be issued on other
occasions where a cluster gets freed (on/off; default: off)

@item overlap-check
Which overlap checks to perform for writes to the image
(none/constant/cached/all; default: cached). For details or finer
granularity control refer to the QAPI documentation of @code{blockdev-add}.
@end table

Example 1:
@example
-blockdev driver=file,node-name=my_file,filename=/tmp/disk.qcow2
-blockdev driver=qcow2,node-name=hda,file=my_file,overlap-check=none,cache-size=16777216
@end example
Example 2:
@example
-blockdev driver=qcow2,node-name=disk,file.driver=http,file.filename=http://example.com/image.qcow2
@end example

@item Driver-specific options for other drivers
Please refer to the QAPI documentation of the @code{blockdev-add} QMP command.

@end table

ETEXI

DEF("drive", HAS_ARG, QEMU_OPTION_drive,
    "-drive [file=file][,if=type][,bus=n][,unit=m][,media=d][,index=i]\n"
    "       [,cyls=c,heads=h,secs=s[,trans=t]][,snapshot=on|off]\n"
    "       [,cache=writethrough|writeback|none|directsync|unsafe][,format=f]\n"
    "       [,serial=s][,addr=A][,rerror=ignore|stop|report]\n"
    "       [,werror=ignore|stop|report|enospc][,id=name][,aio=threads|native]\n"
    "       [,readonly=on|off][,copy-on-read=on|off]\n"
    "       [,discard=ignore|unmap][,detect-zeroes=on|off|unmap]\n"
    "       [[,bps=b]|[[,bps_rd=r][,bps_wr=w]]]\n"
    "       [[,iops=i]|[[,iops_rd=r][,iops_wr=w]]]\n"
    "       [[,bps_max=bm]|[[,bps_rd_max=rm][,bps_wr_max=wm]]]\n"
    "       [[,iops_max=im]|[[,iops_rd_max=irm][,iops_wr_max=iwm]]]\n"
    "       [[,iops_size=is]]\n"
    "       [[,group=g]]\n"
    "                use 'file' as a drive image\n", QEMU_ARCH_ALL)
STEXI
@item -drive @var{option}[,@var{option}[,@var{option}[,...]]]
@findex -drive

Define a new drive. This includes creating a block driver node (the backend) as
well as a guest device, and is mostly a shortcut for defining the corresponding
@option{-blockdev} and @option{-device} options.

@option{-drive} accepts all options that are accepted by @option{-blockdev}. In
addition, it knows the following options:

@table @option
@item file=@var{file}
This option defines which disk image (@pxref{disk_images}) to use with
this drive. If the filename contains comma, you must double it
(for instance, "file=my,,file" to use file "my,file").

Special files such as iSCSI devices can be specified using protocol
specific URLs. See the section for "Device URL Syntax" for more information.
@item if=@var{interface}
This option defines on which type on interface the drive is connected.
Available types are: ide, scsi, sd, mtd, floppy, pflash, virtio, none.
@item bus=@var{bus},unit=@var{unit}
These options define where is connected the drive by defining the bus number and
the unit id.
@item index=@var{index}
This option defines where is connected the drive by using an index in the list
of available connectors of a given interface type.
@item media=@var{media}
This option defines the type of the media: disk or cdrom.
@item cyls=@var{c},heads=@var{h},secs=@var{s}[,trans=@var{t}]
Force disk physical geometry and the optional BIOS translation (trans=none or
lba). These parameters are deprecated, use the corresponding parameters
of @code{-device} instead.
@item snapshot=@var{snapshot}
@var{snapshot} is "on" or "off" and controls snapshot mode for the given drive
(see @option{-snapshot}).
@item cache=@var{cache}
@var{cache} is "none", "writeback", "unsafe", "directsync" or "writethrough"
and controls how the host cache is used to access block data. This is a
shortcut that sets the @option{cache.direct} and @option{cache.no-flush}
options (as in @option{-blockdev}), and additionally @option{cache.writeback},
which provides a default for the @option{write-cache} option of block guest
devices (as in @option{-device}). The modes correspond to the following
settings:

@c Our texi2pod.pl script doesn't support @multitable, so fall back to using
@c plain ASCII art (well, UTF-8 art really). This looks okay both in the manpage
@c and the HTML output.
@example
@              cache.writeback   cache.direct   cache.no-flush
─────────────┼─────────────────────────────────────────────────
writeback     on                off            off
none          on                on             off
writethrough  off               off            off
directsync    off               on             off
unsafe        on                off            on
@end example

The default mode is @option{cache=writeback}.

@item aio=@var{aio}
@var{aio} is "threads", or "native" and selects between pthread based disk I/O and native Linux AIO.
@item format=@var{format}
Specify which disk @var{format} will be used rather than detecting
the format.  Can be used to specify format=raw to avoid interpreting
an untrusted format header.
@item serial=@var{serial}
This option specifies the serial number to assign to the device. This
parameter is deprecated, use the corresponding parameter of @code{-device}
instead.
@item addr=@var{addr}
Specify the controller's PCI address (if=virtio only). This parameter is
deprecated, use the corresponding parameter of @code{-device} instead.
@item werror=@var{action},rerror=@var{action}
Specify which @var{action} to take on write and read errors. Valid actions are:
"ignore" (ignore the error and try to continue), "stop" (pause QEMU),
"report" (report the error to the guest), "enospc" (pause QEMU only if the
host disk is full; report the error to the guest otherwise).
The default setting is @option{werror=enospc} and @option{rerror=report}.
@item copy-on-read=@var{copy-on-read}
@var{copy-on-read} is "on" or "off" and enables whether to copy read backing
file sectors into the image file.
@item bps=@var{b},bps_rd=@var{r},bps_wr=@var{w}
Specify bandwidth throttling limits in bytes per second, either for all request
types or for reads or writes only.  Small values can lead to timeouts or hangs
inside the guest.  A safe minimum for disks is 2 MB/s.
@item bps_max=@var{bm},bps_rd_max=@var{rm},bps_wr_max=@var{wm}
Specify bursts in bytes per second, either for all request types or for reads
or writes only.  Bursts allow the guest I/O to spike above the limit
temporarily.
@item iops=@var{i},iops_rd=@var{r},iops_wr=@var{w}
Specify request rate limits in requests per second, either for all request
types or for reads or writes only.
@item iops_max=@var{bm},iops_rd_max=@var{rm},iops_wr_max=@var{wm}
Specify bursts in requests per second, either for all request types or for reads
or writes only.  Bursts allow the guest I/O to spike above the limit
temporarily.
@item iops_size=@var{is}
Let every @var{is} bytes of a request count as a new request for iops
throttling purposes.  Use this option to prevent guests from circumventing iops
limits by sending fewer but larger requests.
@item group=@var{g}
Join a throttling quota group with given name @var{g}.  All drives that are
members of the same group are accounted for together.  Use this option to
prevent guests from circumventing throttling limits by using many small disks
instead of a single larger disk.
@end table

By default, the @option{cache.writeback=on} mode is used. It will report data
writes as completed as soon as the data is present in the host page cache.
This is safe as long as your guest OS makes sure to correctly flush disk caches
where needed. If your guest OS does not handle volatile disk write caches
correctly and your host crashes or loses power, then the guest may experience
data corruption.

For such guests, you should consider using @option{cache.writeback=off}. This
means that the host page cache will be used to read and write data, but write
notification will be sent to the guest only after QEMU has made sure to flush
each write to the disk. Be aware that this has a major impact on performance.

When using the @option{-snapshot} option, unsafe caching is always used.

Copy-on-read avoids accessing the same backing file sectors repeatedly and is
useful when the backing file is over a slow network.  By default copy-on-read
is off.

Instead of @option{-cdrom} you can use:
@example
qemu-system-i386 -drive file=file,index=2,media=cdrom
@end example

Instead of @option{-hda}, @option{-hdb}, @option{-hdc}, @option{-hdd}, you can
use:
@example
qemu-system-i386 -drive file=file,index=0,media=disk
qemu-system-i386 -drive file=file,index=1,media=disk
qemu-system-i386 -drive file=file,index=2,media=disk
qemu-system-i386 -drive file=file,index=3,media=disk
@end example

You can open an image using pre-opened file descriptors from an fd set:
@example
qemu-system-i386
-add-fd fd=3,set=2,opaque="rdwr:/path/to/file"
-add-fd fd=4,set=2,opaque="rdonly:/path/to/file"
-drive file=/dev/fdset/2,index=0,media=disk
@end example

You can connect a CDROM to the slave of ide0:
@example
qemu-system-i386 -drive file=file,if=ide,index=1,media=cdrom
@end example

If you don't specify the "file=" argument, you define an empty drive:
@example
qemu-system-i386 -drive if=ide,index=1,media=cdrom
@end example

Instead of @option{-fda}, @option{-fdb}, you can use:
@example
qemu-system-i386 -drive file=file,index=0,if=floppy
qemu-system-i386 -drive file=file,index=1,if=floppy
@end example

By default, @var{interface} is "ide" and @var{index} is automatically
incremented:
@example
qemu-system-i386 -drive file=a -drive file=b"
@end example
is interpreted like:
@example
qemu-system-i386 -hda a -hdb b
@end example
ETEXI

DEF("mtdblock", HAS_ARG, QEMU_OPTION_mtdblock,
    "-mtdblock file  use 'file' as on-board Flash memory image\n",
    QEMU_ARCH_ALL)
STEXI
@item -mtdblock @var{file}
@findex -mtdblock
Use @var{file} as on-board Flash memory image.
ETEXI

DEF("sd", HAS_ARG, QEMU_OPTION_sd,
    "-sd file        use 'file' as SecureDigital card image\n", QEMU_ARCH_ALL)
STEXI
@item -sd @var{file}
@findex -sd
Use @var{file} as SecureDigital card image.
ETEXI

DEF("pflash", HAS_ARG, QEMU_OPTION_pflash,
    "-pflash file    use 'file' as a parallel flash image\n", QEMU_ARCH_ALL)
STEXI
@item -pflash @var{file}
@findex -pflash
Use @var{file} as a parallel flash image.
ETEXI

DEF("snapshot", 0, QEMU_OPTION_snapshot,
    "-snapshot       write to temporary files instead of disk image files\n",
    QEMU_ARCH_ALL)
STEXI
@item -snapshot
@findex -snapshot
Write to temporary files instead of disk image files. In this case,
the raw disk image you use is not written back. You can however force
the write back by pressing @key{C-a s} (@pxref{disk_images}).
ETEXI

DEF("fsdev", HAS_ARG, QEMU_OPTION_fsdev,
    "-fsdev fsdriver,id=id[,path=path,][security_model={mapped-xattr|mapped-file|passthrough|none}]\n"
    " [,writeout=immediate][,readonly][,socket=socket|sock_fd=sock_fd][,fmode=fmode][,dmode=dmode]\n"
    " [[,throttling.bps-total=b]|[[,throttling.bps-read=r][,throttling.bps-write=w]]]\n"
    " [[,throttling.iops-total=i]|[[,throttling.iops-read=r][,throttling.iops-write=w]]]\n"
    " [[,throttling.bps-total-max=bm]|[[,throttling.bps-read-max=rm][,throttling.bps-write-max=wm]]]\n"
    " [[,throttling.iops-total-max=im]|[[,throttling.iops-read-max=irm][,throttling.iops-write-max=iwm]]]\n"
    " [[,throttling.iops-size=is]]\n",
    QEMU_ARCH_ALL)

STEXI

@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}]
@findex -fsdev
Define a new file system device. Valid options are:
@table @option
@item @var{fsdriver}
This option specifies the fs driver backend to use.
Currently "local", "handle" and "proxy" file system drivers are supported.
@item id=@var{id}
Specifies identifier for this device
@item path=@var{path}
Specifies the export path for the file system device. Files under
this path will be available to the 9p client on the guest.
@item security_model=@var{security_model}
Specifies the security model to be used for this export path.
Supported security models are "passthrough", "mapped-xattr", "mapped-file" and "none".
In "passthrough" security model, files are stored using the same
credentials as they are created on the guest. This requires QEMU
to run as root. In "mapped-xattr" security model, some of the file
attributes like uid, gid, mode bits and link target are stored as
file attributes. For "mapped-file" these attributes are stored in the
hidden .virtfs_metadata directory. Directories exported by this security model cannot
interact with other unix tools. "none" security model is same as
passthrough except the sever won't report failures if it fails to
set file attributes like ownership. Security model is mandatory
only for local fsdriver. Other fsdrivers (like handle, proxy) don't take
security model as a parameter.
@item writeout=@var{writeout}
This is an optional argument. The only supported value is "immediate".
This means that host page cache will be used to read and write data but
write notification will be sent to the guest only when the data has been
reported as written by the storage subsystem.
@item readonly
Enables exporting 9p share as a readonly mount for guests. By default
read-write access is given.
@item socket=@var{socket}
Enables proxy filesystem driver to use passed socket file for communicating
with virtfs-proxy-helper
@item sock_fd=@var{sock_fd}
Enables proxy filesystem driver to use passed socket descriptor for
communicating with virtfs-proxy-helper. Usually a helper like libvirt
will create socketpair and pass one of the fds as sock_fd
@item fmode=@var{fmode}
Specifies the default mode for newly created files on the host. Works only
with security models "mapped-xattr" and "mapped-file".
@item dmode=@var{dmode}
Specifies the default mode for newly created directories on the host. Works
only with security models "mapped-xattr" and "mapped-file".
@end table

-fsdev option is used along with -device driver "virtio-9p-pci".
@item -device virtio-9p-pci,fsdev=@var{id},mount_tag=@var{mount_tag}
Options for virtio-9p-pci driver are:
@table @option
@item fsdev=@var{id}
Specifies the id value specified along with -fsdev option
@item mount_tag=@var{mount_tag}
Specifies the tag name to be used by the guest to mount this export point
@end table

ETEXI

DEF("virtfs", HAS_ARG, QEMU_OPTION_virtfs,
    "-virtfs local,path=path,mount_tag=tag,security_model=[mapped-xattr|mapped-file|passthrough|none]\n"
    "        [,id=id][,writeout=immediate][,readonly][,socket=socket|sock_fd=sock_fd][,fmode=fmode][,dmode=dmode]\n",
    QEMU_ARCH_ALL)

STEXI

@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}]
@findex -virtfs

The general form of a Virtual File system pass-through options are:
@table @option
@item @var{fsdriver}
This option specifies the fs driver backend to use.
Currently "local", "handle" and "proxy" file system drivers are supported.
@item id=@var{id}
Specifies identifier for this device
@item path=@var{path}
Specifies the export path for the file system device. Files under
this path will be available to the 9p client on the guest.
@item security_model=@var{security_model}
Specifies the security model to be used for this export path.
Supported security models are "passthrough", "mapped-xattr", "mapped-file" and "none".
In "passthrough" security model, files are stored using the same
credentials as they are created on the guest. This requires QEMU
to run as root. In "mapped-xattr" security model, some of the file
attributes like uid, gid, mode bits and link target are stored as
file attributes. For "mapped-file" these attributes are stored in the
hidden .virtfs_metadata directory. Directories exported by this security model cannot
interact with other unix tools. "none" security model is same as
passthrough except the sever won't report failures if it fails to
set file attributes like ownership. Security model is mandatory only
for local fsdriver. Other fsdrivers (like handle, proxy) don't take security
model as a parameter.
@item writeout=@var{writeout}
This is an optional argument. The only supported value is "immediate".
This means that host page cache will be used to read and write data but
write notification will be sent to the guest only when the data has been
reported as written by the storage subsystem.
@item readonly
Enables exporting 9p share as a readonly mount for guests. By default
read-write access is given.
@item socket=@var{socket}
Enables proxy filesystem driver to use passed socket file for
communicating with virtfs-proxy-helper. Usually a helper like libvirt
will create socketpair and pass one of the fds as sock_fd
@item sock_fd
Enables proxy filesystem driver to use passed 'sock_fd' as the socket
descriptor for interfacing with virtfs-proxy-helper
@item fmode=@var{fmode}
Specifies the default mode for newly created files on the host. Works only
with security models "mapped-xattr" and "mapped-file".
@item dmode=@var{dmode}
Specifies the default mode for newly created directories on the host. Works
only with security models "mapped-xattr" and "mapped-file".
@end table
ETEXI

DEF("virtfs_synth", 0, QEMU_OPTION_virtfs_synth,
    "-virtfs_synth Create synthetic file system image\n",
    QEMU_ARCH_ALL)
STEXI
@item -virtfs_synth
@findex -virtfs_synth
Create synthetic file system image
ETEXI

DEF("iscsi", HAS_ARG, QEMU_OPTION_iscsi,
    "-iscsi [user=user][,password=password]\n"
    "       [,header-digest=CRC32C|CR32C-NONE|NONE-CRC32C|NONE\n"
    "       [,initiator-name=initiator-iqn][,id=target-iqn]\n"
    "       [,timeout=timeout]\n"
    "                iSCSI session parameters\n", QEMU_ARCH_ALL)

STEXI
@item -iscsi
@findex -iscsi
Configure iSCSI session parameters.
ETEXI

STEXI
@end table
ETEXI
DEFHEADING()

DEFHEADING(USB options:)
STEXI
@table @option
ETEXI

DEF("usb", 0, QEMU_OPTION_usb,
    "-usb            enable the USB driver (if it is not used by default yet)\n",
    QEMU_ARCH_ALL)
STEXI
@item -usb
@findex -usb
Enable the USB driver (if it is not used by default yet).
ETEXI

DEF("usbdevice", HAS_ARG, QEMU_OPTION_usbdevice,
    "-usbdevice name add the host or guest USB device 'name'\n",
    QEMU_ARCH_ALL)
STEXI

@item -usbdevice @var{devname}
@findex -usbdevice
Add the USB device @var{devname}. Note that this option is deprecated,
please use @code{-device usb-...} instead. @xref{usb_devices}.

@table @option

@item mouse
Virtual Mouse. This will override the PS/2 mouse emulation when activated.

@item tablet
Pointer device that uses absolute coordinates (like a touchscreen). This
means QEMU is able to report the mouse position without having to grab the
mouse. Also overrides the PS/2 mouse emulation when activated.

@item braille
Braille device.  This will use BrlAPI to display the braille output on a real
or fake device.

@end table
ETEXI

STEXI
@end table
ETEXI
DEFHEADING()

DEFHEADING(Display options:)
STEXI
@table @option
ETEXI

DEF("display", HAS_ARG, QEMU_OPTION_display,
    "-display sdl[,frame=on|off][,alt_grab=on|off][,ctrl_grab=on|off]\n"
    "            [,window_close=on|off][,gl=on|core|es|off]\n"
    "-display gtk[,grab_on_hover=on|off][,gl=on|off]|\n"
    "-display vnc=<display>[,<optargs>]\n"
    "-display curses\n"
    "-display none"
    "                select display type\n"
    "The default display is equivalent to\n"
#if defined(CONFIG_GTK)
            "\t\"-display gtk\"\n"
#elif defined(CONFIG_SDL)
            "\t\"-display sdl\"\n"
#elif defined(CONFIG_COCOA)
            "\t\"-display cocoa\"\n"
#elif defined(CONFIG_VNC)
            "\t\"-vnc localhost:0,to=99,id=default\"\n"
#else
            "\t\"-display none\"\n"
#endif
    , QEMU_ARCH_ALL)
STEXI
@item -display @var{type}
@findex -display
Select type of display to use. This option is a replacement for the
old style -sdl/-curses/... options. Valid values for @var{type} are
@table @option
@item sdl
Display video output via SDL (usually in a separate graphics
window; see the SDL documentation for other possibilities).
@item curses
Display video output via curses. For graphics device models which
support a text mode, QEMU can display this output using a
curses/ncurses interface. Nothing is displayed when the graphics
device is in graphical mode or if the graphics device does not support
a text mode. Generally only the VGA device models support text mode.
@item none
Do not display video output. The guest will still see an emulated
graphics card, but its output will not be displayed to the QEMU
user. This option differs from the -nographic option in that it
only affects what is done with video output; --nographic also changes
the destination of the serial and parallel port data.
@item gtk
Display video output in a GTK window. This interface provides drop-down
menus and other UI elements to configure and control the VM during
runtime.
@item vnc
Start a VNC server on display <arg>
@end table
ETEXI

DEF("nographic", 0, QEMU_OPTION_nographic,
    "-nographic      disable graphical output and redirect serial I/Os to console\n",
    QEMU_ARCH_ALL)
STEXI
@item -nographic
@findex -nographic
Normally, if QEMU is compiled with graphical window support, it displays
output such as guest graphics, guest console, and the QEMU monitor in a
window. With this option, you can totally disable graphical output so
that QEMU is a simple command line application. The emulated serial port
is redirected on the console and muxed with the monitor (unless
redirected elsewhere explicitly). Therefore, you can still use QEMU to
debug a Linux kernel with a serial console. Use @key{C-a h} for help on
switching between the console and monitor.
ETEXI

DEF("curses", 0, QEMU_OPTION_curses,
    "-curses         shorthand for -display curses\n",
    QEMU_ARCH_ALL)
STEXI
@item -curses
@findex -curses
Normally, if QEMU is compiled with graphical window support, it displays
output such as guest graphics, guest console, and the QEMU monitor in a
window. With this option, QEMU can display the VGA output when in text
mode using a curses/ncurses interface. Nothing is displayed in graphical
mode.
ETEXI

DEF("no-frame", 0, QEMU_OPTION_no_frame,
    "-no-frame       open SDL window without a frame and window decorations\n",
    QEMU_ARCH_ALL)
STEXI
@item -no-frame
@findex -no-frame
Do not use decorations for SDL windows and start them using the whole
available screen space. This makes the using QEMU in a dedicated desktop
workspace more convenient.
ETEXI

DEF("alt-grab", 0, QEMU_OPTION_alt_grab,
    "-alt-grab       use Ctrl-Alt-Shift to grab mouse (instead of Ctrl-Alt)\n",
    QEMU_ARCH_ALL)
STEXI
@item -alt-grab
@findex -alt-grab
Use Ctrl-Alt-Shift to grab mouse (instead of Ctrl-Alt). Note that this also
affects the special keys (for fullscreen, monitor-mode switching, etc).
ETEXI

DEF("ctrl-grab", 0, QEMU_OPTION_ctrl_grab,
    "-ctrl-grab      use Right-Ctrl to grab mouse (instead of Ctrl-Alt)\n",
    QEMU_ARCH_ALL)
STEXI
@item -ctrl-grab
@findex -ctrl-grab
Use Right-Ctrl to grab mouse (instead of Ctrl-Alt). Note that this also
affects the special keys (for fullscreen, monitor-mode switching, etc).
ETEXI

DEF("no-quit", 0, QEMU_OPTION_no_quit,
    "-no-quit        disable SDL window close capability\n", QEMU_ARCH_ALL)
STEXI
@item -no-quit
@findex -no-quit
Disable SDL window close capability.
ETEXI

DEF("sdl", 0, QEMU_OPTION_sdl,
    "-sdl            shorthand for -display sdl\n", QEMU_ARCH_ALL)
STEXI
@item -sdl
@findex -sdl
Enable SDL.
ETEXI

DEF("spice", HAS_ARG, QEMU_OPTION_spice,
    "-spice [port=port][,tls-port=secured-port][,x509-dir=<dir>]\n"
    "       [,x509-key-file=<file>][,x509-key-password=<file>]\n"
    "       [,x509-cert-file=<file>][,x509-cacert-file=<file>]\n"
    "       [,x509-dh-key-file=<file>][,addr=addr][,ipv4|ipv6|unix]\n"
    "       [,tls-ciphers=<list>]\n"
    "       [,tls-channel=[main|display|cursor|inputs|record|playback]]\n"
    "       [,plaintext-channel=[main|display|cursor|inputs|record|playback]]\n"
    "       [,sasl][,password=<secret>][,disable-ticketing]\n"
    "       [,image-compression=[auto_glz|auto_lz|quic|glz|lz|off]]\n"
    "       [,jpeg-wan-compression=[auto|never|always]]\n"
    "       [,zlib-glz-wan-compression=[auto|never|always]]\n"
    "       [,streaming-video=[off|all|filter]][,disable-copy-paste]\n"
    "       [,disable-agent-file-xfer][,agent-mouse=[on|off]]\n"
    "       [,playback-compression=[on|off]][,seamless-migration=[on|off]]\n"
    "       [,gl=[on|off]][,rendernode=<file>]\n"
    "   enable spice\n"
    "   at least one of {port, tls-port} is mandatory\n",
    QEMU_ARCH_ALL)
STEXI
@item -spice @var{option}[,@var{option}[,...]]
@findex -spice
Enable the spice remote desktop protocol. Valid options are

@table @option

@item port=<nr>
Set the TCP port spice is listening on for plaintext channels.

@item addr=<addr>
Set the IP address spice is listening on.  Default is any address.

@item ipv4
@itemx ipv6
@itemx unix
Force using the specified IP version.

@item password=<secret>
Set the password you need to authenticate.

@item sasl
Require that the client use SASL to authenticate with the spice.
The exact choice of authentication method used is controlled from the
system / user's SASL configuration file for the 'qemu' service. This
is typically found in /etc/sasl2/qemu.conf. If running QEMU as an
unprivileged user, an environment variable SASL_CONF_PATH can be used
to make it search alternate locations for the service config.
While some SASL auth methods can also provide data encryption (eg GSSAPI),
it is recommended that SASL always be combined with the 'tls' and
'x509' settings to enable use of SSL and server certificates. This
ensures a data encryption preventing compromise of authentication
credentials.

@item disable-ticketing
Allow client connects without authentication.

@item disable-copy-paste
Disable copy paste between the client and the guest.

@item disable-agent-file-xfer
Disable spice-vdagent based file-xfer between the client and the guest.

@item tls-port=<nr>
Set the TCP port spice is listening on for encrypted channels.

@item x509-dir=<dir>
Set the x509 file directory. Expects same filenames as -vnc $display,x509=$dir

@item x509-key-file=<file>
@itemx x509-key-password=<file>
@itemx x509-cert-file=<file>
@itemx x509-cacert-file=<file>
@itemx x509-dh-key-file=<file>
The x509 file names can also be configured individually.

@item tls-ciphers=<list>
Specify which ciphers to use.

@item tls-channel=[main|display|cursor|inputs|record|playback]
@itemx plaintext-channel=[main|display|cursor|inputs|record|playback]
Force specific channel to be used with or without TLS encryption.  The
options can be specified multiple times to configure multiple
channels.  The special name "default" can be used to set the default
mode.  For channels which are not explicitly forced into one mode the
spice client is allowed to pick tls/plaintext as he pleases.

@item image-compression=[auto_glz|auto_lz|quic|glz|lz|off]
Configure image compression (lossless).
Default is auto_glz.

@item jpeg-wan-compression=[auto|never|always]
@itemx zlib-glz-wan-compression=[auto|never|always]
Configure wan image compression (lossy for slow links).
Default is auto.

@item streaming-video=[off|all|filter]
Configure video stream detection.  Default is off.

@item agent-mouse=[on|off]
Enable/disable passing mouse events via vdagent.  Default is on.

@item playback-compression=[on|off]
Enable/disable audio stream compression (using celt 0.5.1).  Default is on.

@item seamless-migration=[on|off]
Enable/disable spice seamless migration. Default is off.

@item gl=[on|off]
Enable/disable OpenGL context. Default is off.

@item rendernode=<file>
DRM render node for OpenGL rendering. If not specified, it will pick
the first available. (Since 2.9)

@end table
ETEXI

DEF("portrait", 0, QEMU_OPTION_portrait,
    "-portrait       rotate graphical output 90 deg left (only PXA LCD)\n",
    QEMU_ARCH_ALL)
STEXI
@item -portrait
@findex -portrait
Rotate graphical output 90 deg left (only PXA LCD).
ETEXI

DEF("rotate", HAS_ARG, QEMU_OPTION_rotate,
    "-rotate <deg>   rotate graphical output some deg left (only PXA LCD)\n",
    QEMU_ARCH_ALL)
STEXI
@item -rotate @var{deg}
@findex -rotate
Rotate graphical output some deg left (only PXA LCD).
ETEXI

DEF("vga", HAS_ARG, QEMU_OPTION_vga,
    "-vga [std|cirrus|vmware|qxl|xenfb|tcx|cg3|virtio|none]\n"
    "                select video card type\n", QEMU_ARCH_ALL)
STEXI
@item -vga @var{type}
@findex -vga
Select type of VGA card to emulate. Valid values for @var{type} are
@table @option
@item cirrus
Cirrus Logic GD5446 Video card. All Windows versions starting from
Windows 95 should recognize and use this graphic card. For optimal
performances, use 16 bit color depth in the guest and the host OS.
(This card was the default before QEMU 2.2)
@item std
Standard VGA card with Bochs VBE extensions.  If your guest OS
supports the VESA 2.0 VBE extensions (e.g. Windows XP) and if you want
to use high resolution modes (>= 1280x1024x16) then you should use
this option. (This card is the default since QEMU 2.2)
@item vmware
VMWare SVGA-II compatible adapter. Use it if you have sufficiently
recent XFree86/XOrg server or Windows guest with a driver for this
card.
@item qxl
QXL paravirtual graphic card.  It is VGA compatible (including VESA
2.0 VBE support).  Works best with qxl guest drivers installed though.
Recommended choice when using the spice protocol.
@item tcx
(sun4m only) Sun TCX framebuffer. This is the default framebuffer for
sun4m machines and offers both 8-bit and 24-bit colour depths at a
fixed resolution of 1024x768.
@item cg3
(sun4m only) Sun cgthree framebuffer. This is a simple 8-bit framebuffer
for sun4m machines available in both 1024x768 (OpenBIOS) and 1152x900 (OBP)
resolutions aimed at people wishing to run older Solaris versions.
@item virtio
Virtio VGA card.
@item none
Disable VGA card.
@end table
ETEXI

DEF("full-screen", 0, QEMU_OPTION_full_screen,
    "-full-screen    start in full screen\n", QEMU_ARCH_ALL)
STEXI
@item -full-screen
@findex -full-screen
Start in full screen.
ETEXI

DEF("g", 1, QEMU_OPTION_g ,
    "-g WxH[xDEPTH]  Set the initial graphical resolution and depth\n",
    QEMU_ARCH_PPC | QEMU_ARCH_SPARC)
STEXI
@item -g @var{width}x@var{height}[x@var{depth}]
@findex -g
Set the initial graphical resolution and depth (PPC, SPARC only).
ETEXI

DEF("vnc", HAS_ARG, QEMU_OPTION_vnc ,
    "-vnc <display>  shorthand for -display vnc=<display>\n", QEMU_ARCH_ALL)
STEXI
@item -vnc @var{display}[,@var{option}[,@var{option}[,...]]]
@findex -vnc
Normally, if QEMU is compiled with graphical window support, it displays
output such as guest graphics, guest console, and the QEMU monitor in a
window. With this option, you can have QEMU listen on VNC display
@var{display} and redirect the VGA display over the VNC session. It is
very useful to enable the usb tablet device when using this option
(option @option{-device usb-tablet}). When using the VNC display, you
must use the @option{-k} parameter to set the keyboard layout if you are
not using en-us. Valid syntax for the @var{display} is

@table @option

@item to=@var{L}

With this option, QEMU will try next available VNC @var{display}s, until the
number @var{L}, if the origianlly defined "-vnc @var{display}" is not
available, e.g. port 5900+@var{display} is already used by another
application. By default, to=0.

@item @var{host}:@var{d}

TCP connections will only be allowed from @var{host} on display @var{d}.
By convention the TCP port is 5900+@var{d}. Optionally, @var{host} can
be omitted in which case the server will accept connections from any host.

@item unix:@var{path}

Connections will be allowed over UNIX domain sockets where @var{path} is the
location of a unix socket to listen for connections on.

@item none

VNC is initialized but not started. The monitor @code{change} command
can be used to later start the VNC server.

@end table

Following the @var{display} value there may be one or more @var{option} flags
separated by commas. Valid options are

@table @option

@item reverse

Connect to a listening VNC client via a ``reverse'' connection. The
client is specified by the @var{display}. For reverse network
connections (@var{host}:@var{d},@code{reverse}), the @var{d} argument
is a TCP port number, not a display number.

@item websocket

Opens an additional TCP listening port dedicated to VNC Websocket connections.
If a bare @var{websocket} option is given, the Websocket port is
5700+@var{display}. An alternative port can be specified with the
syntax @code{websocket}=@var{port}.

If @var{host} is specified connections will only be allowed from this host.
It is possible to control the websocket listen address independently, using
the syntax @code{websocket}=@var{host}:@var{port}.

If no TLS credentials are provided, the websocket connection runs in
unencrypted mode. If TLS credentials are provided, the websocket connection
requires encrypted client connections.

@item password

Require that password based authentication is used for client connections.

The password must be set separately using the @code{set_password} command in
the @ref{pcsys_monitor}. The syntax to change your password is:
@code{set_password <protocol> <password>} where <protocol> could be either
"vnc" or "spice".

If you would like to change <protocol> password expiration, you should use
@code{expire_password <protocol> <expiration-time>} where expiration time could
be one of the following options: now, never, +seconds or UNIX time of
expiration, e.g. +60 to make password expire in 60 seconds, or 1335196800
to make password expire on "Mon Apr 23 12:00:00 EDT 2012" (UNIX time for this
date and time).

You can also use keywords "now" or "never" for the expiration time to
allow <protocol> password to expire immediately or never expire.

@item tls-creds=@var{ID}

Provides the ID of a set of TLS credentials to use to secure the
VNC server. They will apply to both the normal VNC server socket
and the websocket socket (if enabled). Setting TLS credentials
will cause the VNC server socket to enable the VeNCrypt auth
mechanism.  The credentials should have been previously created
using the @option{-object tls-creds} argument.

The @option{tls-creds} parameter obsoletes the @option{tls},
@option{x509}, and @option{x509verify} options, and as such
it is not permitted to set both new and old type options at
the same time.

@item tls

Require that client use TLS when communicating with the VNC server. This
uses anonymous TLS credentials so is susceptible to a man-in-the-middle
attack. It is recommended that this option be combined with either the
@option{x509} or @option{x509verify} options.

This option is now deprecated in favor of using the @option{tls-creds}
argument.

@item x509=@var{/path/to/certificate/dir}

Valid if @option{tls} is specified. Require that x509 credentials are used
for negotiating the TLS session. The server will send its x509 certificate
to the client. It is recommended that a password be set on the VNC server
to provide authentication of the client when this is used. The path following
this option specifies where the x509 certificates are to be loaded from.
See the @ref{vnc_security} section for details on generating certificates.

This option is now deprecated in favour of using the @option{tls-creds}
argument.

@item x509verify=@var{/path/to/certificate/dir}

Valid if @option{tls} is specified. Require that x509 credentials are used
for negotiating the TLS session. The server will send its x509 certificate
to the client, and request that the client send its own x509 certificate.
The server will validate the client's certificate against the CA certificate,
and reject clients when validation fails. If the certificate authority is
trusted, this is a sufficient authentication mechanism. You may still wish
to set a password on the VNC server as a second authentication layer. The
path following this option specifies where the x509 certificates are to
be loaded from. See the @ref{vnc_security} section for details on generating
certificates.

This option is now deprecated in favour of using the @option{tls-creds}
argument.

@item sasl

Require that the client use SASL to authenticate with the VNC server.
The exact choice of authentication method used is controlled from the
system / user's SASL configuration file for the 'qemu' service. This
is typically found in /etc/sasl2/qemu.conf. If running QEMU as an
unprivileged user, an environment variable SASL_CONF_PATH can be used
to make it search alternate locations for the service config.
While some SASL auth methods can also provide data encryption (eg GSSAPI),
it is recommended that SASL always be combined with the 'tls' and
'x509' settings to enable use of SSL and server certificates. This
ensures a data encryption preventing compromise of authentication
credentials. See the @ref{vnc_security} section for details on using
SASL authentication.

@item acl

Turn on access control lists for checking of the x509 client certificate
and SASL party. For x509 certs, the ACL check is made against the
certificate's distinguished name. This is something that looks like
@code{C=GB,O=ACME,L=Boston,CN=bob}. For SASL party, the ACL check is
made against the username, which depending on the SASL plugin, may
include a realm component, eg @code{bob} or @code{bob@@EXAMPLE.COM}.
When the @option{acl} flag is set, the initial access list will be
empty, with a @code{deny} policy. Thus no one will be allowed to
use the VNC server until the ACLs have been loaded. This can be
achieved using the @code{acl} monitor command.

@item lossy

Enable lossy compression methods (gradient, JPEG, ...). If this
option is set, VNC client may receive lossy framebuffer updates
depending on its encoding settings. Enabling this option can save
a lot of bandwidth at the expense of quality.

@item non-adaptive

Disable adaptive encodings. Adaptive encodings are enabled by default.
An adaptive encoding will try to detect frequently updated screen regions,
and send updates in these regions using a lossy encoding (like JPEG).
This can be really helpful to save bandwidth when playing videos. Disabling
adaptive encodings restores the original static behavior of encodings
like Tight.

@item share=[allow-exclusive|force-shared|ignore]

Set display sharing policy.  'allow-exclusive' allows clients to ask
for exclusive access.  As suggested by the rfb spec this is
implemented by dropping other connections.  Connecting multiple
clients in parallel requires all clients asking for a shared session
(vncviewer: -shared switch).  This is the default.  'force-shared'
disables exclusive client access.  Useful for shared desktop sessions,
where you don't want someone forgetting specify -shared disconnect
everybody else.  'ignore' completely ignores the shared flag and
allows everybody connect unconditionally.  Doesn't conform to the rfb
spec but is traditional QEMU behavior.

@item key-delay-ms

Set keyboard delay, for key down and key up events, in milliseconds.
Default is 10.  Keyboards are low-bandwidth devices, so this slowdown
can help the device and guest to keep up and not lose events in case
events are arriving in bulk.  Possible causes for the latter are flaky
network connections, or scripts for automated testing.

@end table
ETEXI

STEXI
@end table
ETEXI
ARCHHEADING(, QEMU_ARCH_I386)

ARCHHEADING(i386 target only:, QEMU_ARCH_I386)
STEXI
@table @option
ETEXI

DEF("win2k-hack", 0, QEMU_OPTION_win2k_hack,
    "-win2k-hack     use it when installing Windows 2000 to avoid a disk full bug\n",
    QEMU_ARCH_I386)
STEXI
@item -win2k-hack
@findex -win2k-hack
Use it when installing Windows 2000 to avoid a disk full bug. After
Windows 2000 is installed, you no longer need this option (this option
slows down the IDE transfers).
ETEXI

HXCOMM Deprecated by -rtc
DEF("rtc-td-hack", 0, QEMU_OPTION_rtc_td_hack, "", QEMU_ARCH_I386)

DEF("no-fd-bootchk", 0, QEMU_OPTION_no_fd_bootchk,
    "-no-fd-bootchk  disable boot signature checking for floppy disks\n",
    QEMU_ARCH_I386)
STEXI
@item -no-fd-bootchk
@findex -no-fd-bootchk
Disable boot signature checking for floppy disks in BIOS. May
be needed to boot from old floppy disks.
ETEXI

DEF("no-acpi", 0, QEMU_OPTION_no_acpi,
           "-no-acpi        disable ACPI\n", QEMU_ARCH_I386 | QEMU_ARCH_ARM)
STEXI
@item -no-acpi
@findex -no-acpi
Disable ACPI (Advanced Configuration and Power Interface) support. Use
it if your guest OS complains about ACPI problems (PC target machine
only).
ETEXI

DEF("no-hpet", 0, QEMU_OPTION_no_hpet,
    "-no-hpet        disable HPET\n", QEMU_ARCH_I386)
STEXI
@item -no-hpet
@findex -no-hpet
Disable HPET support.
ETEXI

DEF("acpitable", HAS_ARG, QEMU_OPTION_acpitable,
    "-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"
    "                ACPI table description\n", QEMU_ARCH_I386)
STEXI
@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}]...]
@findex -acpitable
Add ACPI table with specified header fields and context from specified files.
For file=, take whole ACPI table from the specified files, including all
ACPI headers (possible overridden by other options).
For data=, only data
portion of the table is used, all header information is specified in the
command line.
If a SLIC table is supplied to QEMU, then the SLIC's oem_id and oem_table_id
fields will override the same in the RSDT and the FADT (a.k.a. FACP), in order
to ensure the field matches required by the Microsoft SLIC spec and the ACPI
spec.
ETEXI

DEF("smbios", HAS_ARG, QEMU_OPTION_smbios,
    "-smbios file=binary\n"
    "                load SMBIOS entry from binary file\n"
    "-smbios type=0[,vendor=str][,version=str][,date=str][,release=%d.%d]\n"
    "              [,uefi=on|off]\n"
    "                specify SMBIOS type 0 fields\n"
    "-smbios type=1[,manufacturer=str][,product=str][,version=str][,serial=str]\n"
    "              [,uuid=uuid][,sku=str][,family=str]\n"
    "                specify SMBIOS type 1 fields\n"
    "-smbios type=2[,manufacturer=str][,product=str][,version=str][,serial=str]\n"
    "              [,asset=str][,location=str]\n"
    "                specify SMBIOS type 2 fields\n"
    "-smbios type=3[,manufacturer=str][,version=str][,serial=str][,asset=str]\n"
    "              [,sku=str]\n"
    "                specify SMBIOS type 3 fields\n"
    "-smbios type=4[,sock_pfx=str][,manufacturer=str][,version=str][,serial=str]\n"
    "              [,asset=str][,part=str]\n"
    "                specify SMBIOS type 4 fields\n"
    "-smbios type=17[,loc_pfx=str][,bank=str][,manufacturer=str][,serial=str]\n"
    "               [,asset=str][,part=str][,speed=%d]\n"
    "                specify SMBIOS type 17 fields\n",
    QEMU_ARCH_I386 | QEMU_ARCH_ARM)
STEXI
@item -smbios file=@var{binary}
@findex -smbios
Load SMBIOS entry from binary file.

@item -smbios type=0[,vendor=@var{str}][,version=@var{str}][,date=@var{str}][,release=@var{%d.%d}][,uefi=on|off]
Specify SMBIOS type 0 fields

@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}]
Specify SMBIOS type 1 fields

@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}]
Specify SMBIOS type 2 fields

@item -smbios type=3[,manufacturer=@var{str}][,version=@var{str}][,serial=@var{str}][,asset=@var{str}][,sku=@var{str}]
Specify SMBIOS type 3 fields

@item -smbios type=4[,sock_pfx=@var{str}][,manufacturer=@var{str}][,version=@var{str}][,serial=@var{str}][,asset=@var{str}][,part=@var{str}]
Specify SMBIOS type 4 fields

@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}]
Specify SMBIOS type 17 fields
ETEXI

STEXI
@end table
ETEXI
DEFHEADING()

DEFHEADING(Network options:)
STEXI
@table @option
ETEXI

HXCOMM Legacy slirp options (now moved to -net user):
#ifdef CONFIG_SLIRP
DEF("tftp", HAS_ARG, QEMU_OPTION_tftp, "", QEMU_ARCH_ALL)
DEF("bootp", HAS_ARG, QEMU_OPTION_bootp, "", QEMU_ARCH_ALL)
DEF("redir", HAS_ARG, QEMU_OPTION_redir, "", QEMU_ARCH_ALL)
#ifndef _WIN32
DEF("smb", HAS_ARG, QEMU_OPTION_smb, "", QEMU_ARCH_ALL)
#endif
#endif

DEF("netdev", HAS_ARG, QEMU_OPTION_netdev,
#ifdef CONFIG_SLIRP
    "-netdev user,id=str[,ipv4[=on|off]][,net=addr[/mask]][,host=addr]\n"
    "         [,ipv6[=on|off]][,ipv6-net=addr[/int]][,ipv6-host=addr]\n"
    "         [,restrict=on|off][,hostname=host][,dhcpstart=addr]\n"
    "         [,dns=addr][,ipv6-dns=addr][,dnssearch=domain][,domainname=domain]\n"
    "         [,tftp=dir][,bootfile=f][,hostfwd=rule][,guestfwd=rule]"
#ifndef _WIN32
                                             "[,smb=dir[,smbserver=addr]]\n"
#endif
    "                configure a user mode network backend with ID 'str',\n"
    "                its DHCP server and optional services\n"
#endif
#ifdef _WIN32
    "-netdev tap,id=str,ifname=name\n"
    "                configure a host TAP network backend with ID 'str'\n"
#else
    "-netdev tap,id=str[,fd=h][,fds=x:y:...:z][,ifname=name][,script=file][,downscript=dfile]\n"
    "         [,br=bridge][,helper=helper][,sndbuf=nbytes][,vnet_hdr=on|off][,vhost=on|off]\n"
    "         [,vhostfd=h][,vhostfds=x:y:...:z][,vhostforce=on|off][,queues=n]\n"
    "         [,poll-us=n]\n"
    "                configure a host TAP network backend with ID 'str'\n"
    "                connected to a bridge (default=" DEFAULT_BRIDGE_INTERFACE ")\n"
    "                use network scripts 'file' (default=" DEFAULT_NETWORK_SCRIPT ")\n"
    "                to configure it and 'dfile' (default=" DEFAULT_NETWORK_DOWN_SCRIPT ")\n"
    "                to deconfigure it\n"
    "                use '[down]script=no' to disable script execution\n"
    "                use network helper 'helper' (default=" DEFAULT_BRIDGE_HELPER ") to\n"
    "                configure it\n"
    "                use 'fd=h' to connect to an already opened TAP interface\n"
    "                use 'fds=x:y:...:z' to connect to already opened multiqueue capable TAP interfaces\n"
    "                use 'sndbuf=nbytes' to limit the size of the send buffer (the\n"
    "                default is disabled 'sndbuf=0' to enable flow control set 'sndbuf=1048576')\n"
    "                use vnet_hdr=off to avoid enabling the IFF_VNET_HDR tap flag\n"
    "                use vnet_hdr=on to make the lack of IFF_VNET_HDR support an error condition\n"
    "                use vhost=on to enable experimental in kernel accelerator\n"
    "                    (only has effect for virtio guests which use MSIX)\n"
    "                use vhostforce=on to force vhost on for non-MSIX virtio guests\n"
    "                use 'vhostfd=h' to connect to an already opened vhost net device\n"
    "                use 'vhostfds=x:y:...:z to connect to multiple already opened vhost net devices\n"
    "                use 'queues=n' to specify the number of queues to be created for multiqueue TAP\n"
    "                use 'poll-us=n' to speciy the maximum number of microseconds that could be\n"
    "                spent on busy polling for vhost net\n"
    "-netdev bridge,id=str[,br=bridge][,helper=helper]\n"
    "                configure a host TAP network backend with ID 'str' that is\n"
    "                connected to a bridge (default=" DEFAULT_BRIDGE_INTERFACE ")\n"
    "                using the program 'helper (default=" DEFAULT_BRIDGE_HELPER ")\n"
#endif
#ifdef __linux__
    "-netdev l2tpv3,id=str,src=srcaddr,dst=dstaddr[,srcport=srcport][,dstport=dstport]\n"
    "         [,rxsession=rxsession],txsession=txsession[,ipv6=on/off][,udp=on/off]\n"
    "         [,cookie64=on/off][,counter][,pincounter][,txcookie=txcookie]\n"
    "         [,rxcookie=rxcookie][,offset=offset]\n"
    "                configure a network backend with ID 'str' connected to\n"
    "                an Ethernet over L2TPv3 pseudowire.\n"
    "                Linux kernel 3.3+ as well as most routers can talk\n"
    "                L2TPv3. This transport allows connecting a VM to a VM,\n"
    "                VM to a router and even VM to Host. It is a nearly-universal\n"
    "                standard (RFC3391). Note - this implementation uses static\n"
    "                pre-configured tunnels (same as the Linux kernel).\n"
    "                use 'src=' to specify source address\n"
    "                use 'dst=' to specify destination address\n"
    "                use 'udp=on' to specify udp encapsulation\n"
    "                use 'srcport=' to specify source udp port\n"
    "                use 'dstport=' to specify destination udp port\n"
    "                use 'ipv6=on' to force v6\n"
    "                L2TPv3 uses cookies to prevent misconfiguration as\n"
    "                well as a weak security measure\n"
    "                use 'rxcookie=0x012345678' to specify a rxcookie\n"
    "                use 'txcookie=0x012345678' to specify a txcookie\n"
    "                use 'cookie64=on' to set cookie size to 64 bit, otherwise 32\n"
    "                use 'counter=off' to force a 'cut-down' L2TPv3 with no counter\n"
    "                use 'pincounter=on' to work around broken counter handling in peer\n"
    "                use 'offset=X' to add an extra offset between header and data\n"
#endif
    "-netdev socket,id=str[,fd=h][,listen=[host]:port][,connect=host:port]\n"
    "                configure a network backend to connect to another network\n"
    "                using a socket connection\n"
    "-netdev socket,id=str[,fd=h][,mcast=maddr:port[,localaddr=addr]]\n"
    "                configure a network backend to connect to a multicast maddr and port\n"
    "                use 'localaddr=addr' to specify the host address to send packets from\n"
    "-netdev socket,id=str[,fd=h][,udp=host:port][,localaddr=host:port]\n"
    "                configure a network backend to connect to another network\n"
    "                using an UDP tunnel\n"
#ifdef CONFIG_VDE
    "-netdev vde,id=str[,sock=socketpath][,port=n][,group=groupname][,mode=octalmode]\n"
    "                configure a network backend to connect to port 'n' of a vde switch\n"
    "                running on host and listening for incoming connections on 'socketpath'.\n"
    "                Use group 'groupname' and mode 'octalmode' to change default\n"
    "                ownership and permissions for communication port.\n"
#endif
#ifdef CONFIG_NETMAP
    "-netdev netmap,id=str,ifname=name[,devname=nmname]\n"
    "                attach to the existing netmap-enabled network interface 'name', or to a\n"
    "                VALE port (created on the fly) called 'name' ('nmname' is name of the \n"
    "                netmap device, defaults to '/dev/netmap')\n"
#endif
#ifdef CONFIG_POSIX
    "-netdev vhost-user,id=str,chardev=dev[,vhostforce=on|off]\n"
    "                configure a vhost-user network, backed by a chardev 'dev'\n"
#endif
    "-netdev hubport,id=str,hubid=n[,netdev=nd]\n"
    "                configure a hub port on the hub with ID 'n'\n", QEMU_ARCH_ALL)
DEF("nic", HAS_ARG, QEMU_OPTION_nic,
    "-nic [tap|bridge|"
#ifdef CONFIG_SLIRP
    "user|"
#endif
#ifdef __linux__
    "l2tpv3|"
#endif
#ifdef CONFIG_VDE
    "vde|"
#endif
#ifdef CONFIG_NETMAP
    "netmap|"
#endif
#ifdef CONFIG_POSIX
    "vhost-user|"
#endif
    "socket][,option][,...][mac=macaddr]\n"
    "                initialize an on-board / default host NIC (using MAC address\n"
    "                macaddr) and connect it to the given host network backend\n"
    "-nic none       use it alone to have zero network devices (the default is to\n"
    "                provided a 'user' network connection)\n",
    QEMU_ARCH_ALL)
DEF("net", HAS_ARG, QEMU_OPTION_net,
    "-net nic[,macaddr=mac][,model=type][,name=str][,addr=str][,vectors=v]\n"
    "                configure or create an on-board (or machine default) NIC and\n"
    "                connect it to hub 0 (please use -nic unless you need a hub)\n"
    "-net ["
#ifdef CONFIG_SLIRP
    "user|"
#endif
    "tap|"
    "bridge|"
#ifdef CONFIG_VDE
    "vde|"
#endif
#ifdef CONFIG_NETMAP
    "netmap|"
#endif
    "socket][,option][,option][,...]\n"
    "                old way to initialize a host network interface\n"
    "                (use the -netdev option if possible instead)\n", QEMU_ARCH_ALL)
STEXI
@item -nic [tap|bridge|user|l2tpv3|vde|netmap|vhost-user|socket][,...][,mac=macaddr][,model=mn]
@findex -nic
This option is a shortcut for configuring both the on-board (default) guest
NIC hardware and the host network backend in one go. The host backend options
are the same as with the corresponding @option{-netdev} options below.
The guest NIC model can be set with @option{model=@var{modelname}}.
Use @option{model=help} to list the available device types.
The hardware MAC address can be set with @option{mac=@var{macaddr}}.

The following two example do exactly the same, to show how @option{-nic} can
be used to shorten the command line length (note that the e1000 is the default
on i386, so the @option{model=e1000} parameter could even be omitted here, too):
@example
qemu-system-i386 -netdev user,id=n1,ipv6=off -device e1000,netdev=n1,mac=52:54:98:76:54:32
qemu-system-i386 -nic user,ipv6=off,model=e1000,mac=52:54:98:76:54:32
@end example

@item -nic none
Indicate that no network devices should be configured. It is used to override
the default configuration (default NIC with ``user'' host network backend)
which is activated if no other networking options are provided.

@item -netdev user,id=@var{id}[,@var{option}][,@var{option}][,...]
@findex -netdev
Configure user mode host network backend which requires no administrator
privilege to run. Valid options are:

@table @option
@item id=@var{id}
Assign symbolic name for use in monitor commands.

@item ipv4=on|off and ipv6=on|off
Specify that either IPv4 or IPv6 must be enabled. If neither is specified
both protocols are enabled.

@item net=@var{addr}[/@var{mask}]
Set IP network address the guest will see. Optionally specify the netmask,
either in the form a.b.c.d or as number of valid top-most bits. Default is
10.0.2.0/24.

@item host=@var{addr}
Specify the guest-visible address of the host. Default is the 2nd IP in the
guest network, i.e. x.x.x.2.

@item ipv6-net=@var{addr}[/@var{int}]
Set IPv6 network address the guest will see (default is fec0::/64). The
network prefix is given in the usual hexadecimal IPv6 address
notation. The prefix size is optional, and is given as the number of
valid top-most bits (default is 64).

@item ipv6-host=@var{addr}
Specify the guest-visible IPv6 address of the host. Default is the 2nd IPv6 in
the guest network, i.e. xxxx::2.

@item restrict=on|off
If this option is enabled, the guest will be isolated, i.e. it will not be
able to contact the host and no guest IP packets will be routed over the host
to the outside. This option does not affect any explicitly set forwarding rules.

@item hostname=@var{name}
Specifies the client hostname reported by the built-in DHCP server.

@item dhcpstart=@var{addr}
Specify the first of the 16 IPs the built-in DHCP server can assign. Default
is the 15th to 31st IP in the guest network, i.e. x.x.x.15 to x.x.x.31.

@item dns=@var{addr}
Specify the guest-visible address of the virtual nameserver. The address must
be different from the host address. Default is the 3rd IP in the guest network,
i.e. x.x.x.3.

@item ipv6-dns=@var{addr}
Specify the guest-visible address of the IPv6 virtual nameserver. The address
must be different from the host address. Default is the 3rd IP in the guest
network, i.e. xxxx::3.

@item dnssearch=@var{domain}
Provides an entry for the domain-search list sent by the built-in
DHCP server. More than one domain suffix can be transmitted by specifying
this option multiple times. If supported, this will cause the guest to
automatically try to append the given domain suffix(es) in case a domain name
can not be resolved.

Example:
@example
qemu-system-i386 -nic user,dnssearch=mgmt.example.org,dnssearch=example.org
@end example

@item domainname=@var{domain}
Specifies the client domain name reported by the built-in DHCP server.

@item tftp=@var{dir}
When using the user mode network stack, activate a built-in TFTP
server. The files in @var{dir} will be exposed as the root of a TFTP server.
The TFTP client on the guest must be configured in binary mode (use the command
@code{bin} of the Unix TFTP client).

@item bootfile=@var{file}
When using the user mode network stack, broadcast @var{file} as the BOOTP
filename. In conjunction with @option{tftp}, this can be used to network boot
a guest from a local directory.

Example (using pxelinux):
@example
qemu-system-i386 -hda linux.img -boot n -device e1000,netdev=n1 \
    -netdev user,id=n1,tftp=/path/to/tftp/files,bootfile=/pxelinux.0
@end example

@item smb=@var{dir}[,smbserver=@var{addr}]
When using the user mode network stack, activate a built-in SMB
server so that Windows OSes can access to the host files in @file{@var{dir}}
transparently. The IP address of the SMB server can be set to @var{addr}. By
default the 4th IP in the guest network is used, i.e. x.x.x.4.

In the guest Windows OS, the line:
@example
10.0.2.4 smbserver
@end example
must be added in the file @file{C:\WINDOWS\LMHOSTS} (for windows 9x/Me)
or @file{C:\WINNT\SYSTEM32\DRIVERS\ETC\LMHOSTS} (Windows NT/2000).

Then @file{@var{dir}} can be accessed in @file{\\smbserver\qemu}.

Note that a SAMBA server must be installed on the host OS.

@item hostfwd=[tcp|udp]:[@var{hostaddr}]:@var{hostport}-[@var{guestaddr}]:@var{guestport}
Redirect incoming TCP or UDP connections to the host port @var{hostport} to
the guest IP address @var{guestaddr} on guest port @var{guestport}. If
@var{guestaddr} is not specified, its value is x.x.x.15 (default first address
given by the built-in DHCP server). By specifying @var{hostaddr}, the rule can
be bound to a specific host interface. If no connection type is set, TCP is
used. This option can be given multiple times.

For example, to redirect host X11 connection from screen 1 to guest
screen 0, use the following:

@example
# on the host
qemu-system-i386 -nic user,hostfwd=tcp:127.0.0.1:6001-:6000
# this host xterm should open in the guest X11 server
xterm -display :1
@end example

To redirect telnet connections from host port 5555 to telnet port on
the guest, use the following:

@example
# on the host
qemu-system-i386 -nic user,hostfwd=tcp::5555-:23