ETEXI
DEF("smp", HAS_ARG, QEMU_OPTION_smp,
- "-smp n set the number of CPUs to 'n' [default=1]\n")
-STEXI
-@item -smp @var{n}
+ "-smp 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")
+STEXI
+@item -smp @var{n}[,cores=@var{cores}][,threads=@var{threads}][,sockets=@var{sockets}][,maxcpus=@var{maxcpus}]
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,
"-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][,format=f][,serial=s]\n"
- " [,addr=A]\n"
+ " [,addr=A][,id=name][,aio=threads|native]\n"
" use 'file' as a drive image\n")
+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")
STEXI
@item -drive @var{option}[,@var{option}[,@var{option}[,...]]]
Define a new drive. Valid options are:
-@table @code
+@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
@var{snapshot} is "on" or "off" and allows to enable snapshot for given drive (see @option{-snapshot}).
@item cache=@var{cache}
@var{cache} is "none", "writeback", or "writethrough" and controls how the host cache is used to access block data.
+@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 specifiy format=raw to avoid interpreting
"-mtdblock file use 'file' as on-board Flash memory image\n")
STEXI
-@item -mtdblock file
-Use 'file' as on-board Flash memory image.
+@item -mtdblock @var{file}
+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")
STEXI
-@item -sd file
-Use 'file' as SecureDigital card image.
+@item -sd @var{file}
+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")
STEXI
-@item -pflash file
-Use 'file' as a parallel flash image.
+@item -pflash @var{file}
+Use @var{file} as a parallel flash image.
ETEXI
DEF("boot", HAS_ARG, QEMU_OPTION_boot,
- "-boot [a|c|d|n] boot on floppy (a), hard disk (c), CD-ROM (d), or network (n)\n")
+ "-boot [order=drives][,once=drives][,menu=on|off]\n"
+ " 'drives': floppy (a), hard disk (c), CD-ROM (d), network (n)\n")
STEXI
-@item -boot [a|c|d|n]
-Boot on floppy (a), hard disk (c), CD-ROM (d), or Etherboot (n). Hard disk boot
-is the default.
+@item -boot [order=@var{drives}][,once=@var{drives}][,menu=on|off]
+
+Specify boot order @var{drives} as a string of drive letters. Valid
+drive letters depend on the target achitecture. 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}.
+
+Interactive boot menus/prompts can be enabled via @option{menu=on} as far
+as firmware/BIOS supports them. The default is non-interactive boot.
+
+@example
+# try to boot from network first, then from hard disk
+qemu -boot order=nc
+# boot from CD-ROM first, switch back to default order after reboot
+qemu -boot once=d
+@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("snapshot", 0, QEMU_OPTION_snapshot,
@item -usbdevice @var{devname}
Add the USB device @var{devname}. @xref{usb_devices}.
-@table @code
+@table @option
@item mouse
Virtual Mouse. This will override the PS/2 mouse emulation when activated.
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 disk:[format=@var{format}]:file
+@item disk:[format=@var{format}]:@var{file}
Mass storage device based on file. The optional @var{format} argument
will be used rather than detecting the format. Can be used to specifiy
-format=raw to avoid interpreting an untrusted format header.
+@code{format=raw} to avoid interpreting an untrusted format header.
-@item host:bus.addr
-Pass through the host device identified by bus.addr (Linux only).
+@item host:@var{bus}.@var{addr}
+Pass through the host device identified by @var{bus}.@var{addr} (Linux only).
-@item host:vendor_id:product_id
-Pass through the host device identified by vendor_id:product_id (Linux only).
+@item host:@var{vendor_id}:@var{product_id}
+Pass through the host device identified by @var{vendor_id}:@var{product_id}
+(Linux only).
@item serial:[vendorid=@var{vendor_id}][,productid=@var{product_id}]:@var{dev}
Serial converter to host character device @var{dev}, see @code{-serial} for the
Braille device. This will use BrlAPI to display the braille output on a real
or fake device.
-@item net:options
+@item net:@var{options}
Network adapter that supports CDC ethernet and RNDIS protocols.
@end table
ETEXI
+DEF("device", HAS_ARG, QEMU_OPTION_device,
+ "-device driver[,options] add device\n")
DEF("name", HAS_ARG, QEMU_OPTION_name,
- "-name string set the name of the guest\n")
+ "-name string1[,process=string2] set the name of the guest\n"
+ " string1 sets the window title and string2 the process name (on Linux)\n")
STEXI
@item -name @var{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.
ETEXI
DEF("uuid", HAS_ARG, QEMU_OPTION_uuid,
Use Ctrl-Alt-Shift to grab mouse (instead of Ctrl-Alt).
ETEXI
+#ifdef CONFIG_SDL
+DEF("ctrl-grab", 0, QEMU_OPTION_ctrl_grab,
+ "-ctrl-grab use Right-Ctrl to grab mouse (instead of Ctrl-Alt)\n")
+#endif
+STEXI
+@item -ctrl-grab
+
+Use Right-Ctrl to grab mouse (instead of Ctrl-Alt).
+ETEXI
+
#ifdef CONFIG_SDL
DEF("no-quit", 0, QEMU_OPTION_no_quit,
"-no-quit disable SDL window close capability\n")
STEXI
@item -vga @var{type}
Select type of VGA card to emulate. Valid values for @var{type} are
-@table @code
+@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
parameter to set the keyboard layout if you are not using en-us. Valid
syntax for the @var{display} is
-@table @code
+@table @option
@item @var{host}:@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 @code{unix}:@var{path}
+@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.
Following the @var{display} value there may be one or more @var{option} flags
separated by commas. Valid options are
-@table @code
+@table @option
@item reverse
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
-@var{x509} or @var{x509verify} options.
+@option{x509} or @option{x509verify} options.
@item x509=@var{/path/to/certificate/dir}
ETEXI
#ifdef TARGET_I386
-DEF("rtc-td-hack", 0, QEMU_OPTION_rtc_td_hack,
- "-rtc-td-hack use it to fix time drift in Windows ACPI HAL\n")
+HXCOMM Deprecated by -rtc
+DEF("rtc-td-hack", 0, QEMU_OPTION_rtc_td_hack, "")
#endif
-STEXI
-@item -rtc-td-hack
-Use it if you experience time drift problem in Windows with ACPI HAL.
-This option will try to figure out how many timer interrupts were not
-processed by the Windows guest and will re-inject them.
-ETEXI
#ifdef TARGET_I386
DEF("no-fd-bootchk", 0, QEMU_OPTION_no_fd_bootchk,
"-net tap[,vlan=n][,name=str],ifname=name\n"
" connect the host TAP network interface to VLAN 'n'\n"
#else
- "-net tap[,vlan=n][,name=str][,fd=h][,ifname=name][,script=file][,downscript=dfile]"
-#ifdef TUNSETSNDBUF
- "[,sndbuf=nbytes]"
-#endif
- "\n"
+ "-net tap[,vlan=n][,name=str][,fd=h][,ifname=name][,script=file][,downscript=dfile][,sndbuf=nbytes][,vnet_hdr=on|off]\n"
" connect the host TAP network interface to VLAN 'n' and use the\n"
" network scripts 'file' (default=%s)\n"
" and 'dfile' (default=%s);\n"
" use '[down]script=no' to disable script execution;\n"
" use 'fd=h' to connect to an already opened TAP interface\n"
-#ifdef TUNSETSNDBUF
" use 'sndbuf=nbytes' to limit the size of the send buffer; the\n"
" default of 'sndbuf=1048576' can be disabled using 'sndbuf=0'\n"
-#endif
+ " use vnet_hdr=off to avoid enabling the IFF_VNET_HDR tap flag; use\n"
+ " vnet_hdr=on to make the lack of IFF_VNET_HDR support an error condition\n"
#endif
"-net socket[,vlan=n][,name=str][,fd=h][,listen=[host]:port][,connect=host:port]\n"
" connect the vlan 'n' to another VLAN using a socket connection\n"
" dump traffic on vlan 'n' to file 'f' (max n bytes per packet)\n"
"-net none use it alone to have zero network devices; if no -net option\n"
" is provided, the default is '-net nic -net user'\n")
+DEF("netdev", HAS_ARG, QEMU_OPTION_netdev,
+ "-netdev ["
+#ifdef CONFIG_SLIRP
+ "user|"
+#endif
+ "tap|"
+#ifdef CONFIG_VDE
+ "vde|"
+#endif
+ "socket],id=str[,option][,option][,...]\n")
STEXI
@item -net nic[,vlan=@var{n}][,macaddr=@var{mac}][,model=@var{type}][,name=@var{name}][,addr=@var{addr}][,vectors=@var{v}]
Create a new Network Interface Card and connect it to VLAN @var{n} (@var{n}
-= 0 is the default). The NIC is an ne2k_pci by default on the PC
+= 0 is the default). The NIC is an e1000 by default on the PC
target. Optionally, the MAC address can be changed to @var{mac}, the
device address set to @var{addr} (PCI cards only),
and a @var{name} can be assigned for use in monitor commands.
Use the user mode network stack which requires no administrator
privilege to run. Valid options are:
-@table @code
+@table @option
@item vlan=@var{n}
Connect user mode stack to VLAN @var{n} (@var{n} = 0 is the default).
@end table
ETEXI
+DEFHEADING()
+
+DEFHEADING(Character device options:)
+
+DEF("chardev", HAS_ARG, QEMU_OPTION_chardev,
+ "-chardev null,id=id\n"
+ "-chardev socket,id=id[,host=host],port=host[,to=to][,ipv4][,ipv6][,nodelay]\n"
+ " [,server][,nowait][,telnet] (tcp)\n"
+ "-chardev socket,id=id,path=path[,server][,nowait][,telnet] (unix)\n"
+ "-chardev udp,id=id[,host=host],port=port[,localaddr=localaddr]\n"
+ " [,localport=localport][,ipv4][,ipv6]\n"
+ "-chardev msmouse,id=id\n"
+ "-chardev vc,id=id[[,width=width][,height=height]][[,cols=cols][,rows=rows]]\n"
+ "-chardev file,id=id,path=path\n"
+ "-chardev pipe,id=id,path=path\n"
+#ifdef _WIN32
+ "-chardev console,id=id\n"
+ "-chardev serial,id=id,path=path\n"
+#else
+ "-chardev pty,id=id\n"
+ "-chardev stdio,id=id\n"
+#endif
+#ifdef CONFIG_BRLAPI
+ "-chardev braille,id=id\n"
+#endif
+#if defined(__linux__) || defined(__sun__) || defined(__FreeBSD__) \
+ || defined(__NetBSD__) || defined(__OpenBSD__) || defined(__DragonFly__)
+ "-chardev tty,id=id,path=path\n"
+#endif
+#if defined(__linux__) || defined(__FreeBSD__) || defined(__DragonFly__)
+ "-chardev parport,id=id,path=path\n"
+#endif
+)
+
+STEXI
+
+The general form of a character device option is:
+@table @option
+
+@item -chardev @var{backend} ,id=@var{id} [,@var{options}]
+
+Backend is one of:
+@option{null},
+@option{socket},
+@option{udp},
+@option{msmouse},
+@option{vc},
+@option{file},
+@option{pipe},
+@option{console},
+@option{serial},
+@option{pty},
+@option{stdio},
+@option{braille},
+@option{tty},
+@option{parport}.
+The specific backend will determine the applicable options.
+
+All devices must have an id, which can be any string up to 127 characters long.
+It is used to uniquely identify this device in other command line directives.
+
+Options to each backend are described below.
+
+@item -chardev null ,id=@var{id}
+A void device. This device will not emit any data, and will drop any data it
+receives. The null backend does not take any options.
+
+@item -chardev socket ,id=@var{id} [@var{TCP options} or @var{unix options}] [,server] [,nowait] [,telnet]
+
+Create a two-way stream socket, which can be either a TCP or a unix socket. A
+unix socket will be created if @option{path} is specified. Behaviour is
+undefined if TCP options are specified for a unix socket.
+
+@option{server} specifies that the socket shall be a listening socket.
+
+@option{nowait} specifies that QEMU should not block waiting for a client to
+connect to a listening socket.
+
+@option{telnet} specifies that traffic on the socket should interpret telnet
+escape sequences.
+
+TCP and unix socket options are given below:
+
+@table @option
+
+@item TCP options: port=@var{host} [,host=@var{host}] [,to=@var{to}] [,ipv4] [,ipv6] [,nodelay]
+
+@option{host} for a listening socket specifies the local address to be bound.
+For a connecting socket species the remote host to connect to. @option{host} is
+optional for listening sockets. If not specified it defaults to @code{0.0.0.0}.
+
+@option{port} for a listening socket specifies the local port to be bound. For a
+connecting socket specifies the port on the remote host to connect to.
+@option{port} can be given as either a port number or a service name.
+@option{port} is required.
+
+@option{to} is only relevant to listening sockets. If it is specified, and
+@option{port} cannot be bound, QEMU will attempt to bind to subsequent ports up
+to and including @option{to} until it succeeds. @option{to} must be specified
+as a port number.
+
+@option{ipv4} and @option{ipv6} specify that either IPv4 or IPv6 must be used.
+If neither is specified the socket may use either protocol.
+
+@option{nodelay} disables the Nagle algorithm.
+
+@item unix options: path=@var{path}
+
+@option{path} specifies the local path of the unix socket. @option{path} is
+required.
+
+@end table
+
+@item -chardev udp ,id=@var{id} [,host=@var{host}] ,port=@var{port} [,localaddr=@var{localaddr}] [,localport=@var{localport}] [,ipv4] [,ipv6]
+
+Sends all traffic from the guest to a remote host over UDP.
+
+@option{host} specifies the remote host to connect to. If not specified it
+defaults to @code{localhost}.
+
+@option{port} specifies the port on the remote host to connect to. @option{port}
+is required.
+
+@option{localaddr} specifies the local address to bind to. If not specified it
+defaults to @code{0.0.0.0}.
+
+@option{localport} specifies the local port to bind to. If not specified any
+available local port will be used.
+
+@option{ipv4} and @option{ipv6} specify that either IPv4 or IPv6 must be used.
+If neither is specified the device may use either protocol.
+
+@item -chardev msmouse ,id=@var{id}
+
+Forward QEMU's emulated msmouse events to the guest. @option{msmouse} does not
+take any options.
+
+@item -chardev vc ,id=@var{id} [[,width=@var{width}] [,height=@var{height}]] [[,cols=@var{cols}] [,rows=@var{rows}]]
+
+Connect to a QEMU text console. @option{vc} may optionally be given a specific
+size.
+
+@option{width} and @option{height} specify the width and height respectively of
+the console, in pixels.
+
+@option{cols} and @option{rows} specify that the console be sized to fit a text
+console with the given dimensions.
+
+@item -chardev file ,id=@var{id} ,path=@var{path}
+
+Log all traffic received from the guest to a file.
+
+@option{path} specifies the path of the file to be opened. This file will be
+created if it does not already exist, and overwritten if it does. @option{path}
+is required.
+
+@item -chardev pipe ,id=@var{id} ,path=@var{path}
+
+Create a two-way connection to the guest. The behaviour differs slightly between
+Windows hosts and other hosts:
+
+On Windows, a single duplex pipe will be created at
+@file{\\.pipe\@option{path}}.
+
+On other hosts, 2 pipes will be created called @file{@option{path}.in} and
+@file{@option{path}.out}. Data written to @file{@option{path}.in} will be
+received by the guest. Data written by the guest can be read from
+@file{@option{path}.out}. QEMU will not create these fifos, and requires them to
+be present.
+
+@option{path} forms part of the pipe path as described above. @option{path} is
+required.
+
+@item -chardev console ,id=@var{id}
+
+Send traffic from the guest to QEMU's standard output. @option{console} does not
+take any options.
+
+@option{console} is only available on Windows hosts.
+
+@item -chardev serial ,id=@var{id} ,path=@option{path}
+
+Send traffic from the guest to a serial device on the host.
+
+@option{serial} is
+only available on Windows hosts.
+
+@option{path} specifies the name of the serial device to open.
+
+@item -chardev pty ,id=@var{id}
+
+Create a new pseudo-terminal on the host and connect to it. @option{pty} does
+not take any options.
+
+@option{pty} is not available on Windows hosts.
+
+@item -chardev stdio ,id=@var{id}
+Connect to standard input and standard output of the qemu process.
+@option{stdio} does not take any options. @option{stdio} is not available on
+Windows hosts.
+
+@item -chardev braille ,id=@var{id}
+
+Connect to a local BrlAPI server. @option{braille} does not take any options.
+
+@item -chardev tty ,id=@var{id} ,path=@var{path}
+
+Connect to a local tty device.
+
+@option{tty} is only available on Linux, Sun, FreeBSD, NetBSD, OpenBSD and
+DragonFlyBSD hosts.
+
+@option{path} specifies the path to the tty. @option{path} is required.
+
+@item -chardev parport ,id=@var{id} ,path=@var{path}
+
+@option{parport} is only available on Linux, FreeBSD and DragonFlyBSD hosts.
+
+Connect to a local parallel port.
+
+@option{path} specifies the path to the parallel port device. @option{path} is
+required.
+
+@end table
+ETEXI
+
+DEFHEADING()
+
+DEFHEADING(Bluetooth(R) options:)
+
DEF("bt", HAS_ARG, QEMU_OPTION_bt, \
- "\n" \
"-bt hci,null dumb bluetooth HCI - doesn't respond to commands\n" \
"-bt hci,host[:id]\n" \
" use host's HCI with the given name\n" \
"-bt device:dev[,vlan=n]\n" \
" emulate a bluetooth device 'dev' in scatternet 'n'\n")
STEXI
-Bluetooth(R) options:
@table @option
@item -bt hci[...]
@anchor{bt-hcis}
The following three types are recognized:
-@table @code
+@table @option
@item -bt hci,null
(default) The corresponding Bluetooth HCI assumes no internal logic
and will not respond to any HCI commands or emit events.
(default @code{0}). QEMU can only emulate one type of bluetooth devices
currently:
-@table @code
+@table @option
@item keyboard
Virtual wireless keyboard implementing the HIDP bluetooth profile.
@end table
Use @code{-serial none} to disable all serial ports.
Available character devices are:
-@table @code
-@item vc[:WxH]
+@table @option
+@item vc[:@var{W}x@var{H}]
Virtual console. Optionally, a width and height can be given in pixel with
@example
vc:800x600
When @var{remote_host} or @var{src_ip} are not specified
they default to @code{0.0.0.0}.
When not using a specified @var{src_port} a random port is automatically chosen.
-@item msmouse
-Three button serial mouse. Configure the guest to use Microsoft protocol.
If you just want a simple readonly console you can use @code{netcat} or
@code{nc}, by starting qemu with: @code{-serial udp::4555} and nc as:
Braille device. This will use BrlAPI to display the braille output on a real
or fake device.
+@item msmouse
+Three button serial mouse. Configure the guest to use Microsoft protocol.
@end table
ETEXI
ETEXI
DEF("monitor", HAS_ARG, QEMU_OPTION_monitor, \
- "-monitor dev redirect the monitor to char device 'dev'\n")
+ "-monitor [control,]dev redirect the monitor to char device 'dev'\n")
STEXI
-@item -monitor @var{dev}
+@item -monitor [@var{control},]@var{dev}
Redirect the monitor to host device @var{dev} (same devices as the
serial port).
The default device is @code{vc} in graphical mode and @code{stdio} in
non graphical mode.
+The option @var{control} enables the QEMU Monitor Protocol.
ETEXI
DEF("pidfile", HAS_ARG, QEMU_OPTION_pidfile, \
Set the filename for the BIOS.
ETEXI
-#ifdef CONFIG_KQEMU
-DEF("kernel-kqemu", 0, QEMU_OPTION_kernel_kqemu, \
- "-kernel-kqemu enable KQEMU full virtualization (default is user mode only)\n")
-#endif
-STEXI
-@item -kernel-kqemu
-Enable KQEMU full virtualization (default is user mode only).
-ETEXI
-
-#ifdef CONFIG_KQEMU
-DEF("no-kqemu", 0, QEMU_OPTION_no_kqemu, \
- "-no-kqemu disable KQEMU kernel module usage\n")
-#endif
-STEXI
-@item -no-kqemu
-Disable KQEMU kernel module usage. KQEMU options are only available if
-KQEMU support is enabled when compiling.
-ETEXI
-
#ifdef CONFIG_KVM
DEF("enable-kvm", 0, QEMU_OPTION_enable_kvm, \
"-enable-kvm enable KVM full virtualization support\n")
are available use -clock ?.
ETEXI
-DEF("localtime", 0, QEMU_OPTION_localtime, \
- "-localtime set the real time clock to local time [default=utc]\n")
-STEXI
-@item -localtime
-Set the real time clock to local time (the default is to UTC
-time). This option is needed to have correct date in MS-DOS or
-Windows.
-ETEXI
+HXCOMM Options deprecated by -rtc
+DEF("localtime", 0, QEMU_OPTION_localtime, "")
+DEF("startdate", HAS_ARG, QEMU_OPTION_startdate, "")
+
+#ifdef TARGET_I386
+DEF("rtc", HAS_ARG, QEMU_OPTION_rtc, \
+ "-rtc [base=utc|localtime|date][,clock=host|vm][,driftfix=none|slew]\n" \
+ " set the RTC base and clock, enable drift fix for clock ticks\n")
+#else
+DEF("rtc", HAS_ARG, QEMU_OPTION_rtc, \
+ "-rtc [base=utc|localtime|date][,clock=host|vm]\n" \
+ " set the RTC base and clock\n")
+#endif
-DEF("startdate", HAS_ARG, QEMU_OPTION_startdate, \
- "-startdate select initial date of the clock\n")
STEXI
-@item -startdate @var{date}
-Set the initial date of the real time clock. Valid formats for
-@var{date} are: @code{now} or @code{2006-06-17T16:01:21} or
-@code{2006-06-17}. The default value is @code{now}.
+@item -rtc [base=utc|localtime|@var{date}][,clock=host|vm][,driftfix=none|slew]
+Specify @option{base} as @code{utc} or @code{localtime} to let the RTC start at the current
+UTC or local time, respectively. @code{localtime} is required for correct date in
+MS-DOS or Windows. To start at a specific point in time, provide @var{date} in the
+format @code{2006-06-17T16:01:21} or @code{2006-06-17}. The default base is UTC.
+
+By default the RTC is driven by the host system time. This allows to use the
+RTC as accurate reference clock inside the guest, specifically if the host
+time is smoothly following an accurate external reference clock, e.g. via NTP.
+If you want to isolate the guest time from the host, even prevent it from
+progressing during suspension, you can set @option{clock} to @code{vm} instead.
+
+Enable @option{driftfix} (i386 targets only) if you experience time drift problems,
+specifically with Windows' ACPI HAL. This option will try to figure out how
+many timer interrupts were not processed by the Windows guest and will
+re-inject them.
ETEXI
DEF("icount", HAS_ARG, QEMU_OPTION_icount, \
" enable virtual instruction counter with 2^N clock ticks per\n" \
" instruction\n")
STEXI
-@item -icount [N|auto]
+@item -icount [@var{N}|auto]
Enable virtual instruction counter. The virtual cpu will execute one
-instruction every 2^N ns of virtual time. If @code{auto} is specified
+instruction every 2^@var{N} ns of virtual time. If @code{auto} is specified
then the virtual cpu speed will be automatically adjusted to keep virtual
time within a few seconds of real time.
"-echr chr set terminal escape character instead of ctrl-a\n")
STEXI
-@item -echr numeric_ascii_value
+@item -echr @var{numeric_ascii_value}
Change the escape character used for switching to the monitor when using
monitor and serial sharing. The default is @code{0x01} when using the
@code{-nographic} option. @code{0x01} is equal to pressing
"-chroot dir Chroot to dir just before starting the VM.\n")
#endif
STEXI
-@item -chroot dir
+@item -chroot @var{dir}
Immediately before starting guest execution, chroot to the specified
directory. Especially useful in combination with -runas.
ETEXI
"-runas user Change to user id user just before starting the VM.\n")
#endif
STEXI
-@item -runas user
+@item -runas @var{user}
Immediately before starting guest execution, drop root privileges, switching
to the specified user.
ETEXI
DEF("old-param", 0, QEMU_OPTION_old_param,
"-old-param old param mode\n")
#endif
+DEF("readconfig", HAS_ARG, QEMU_OPTION_readconfig,
+ "-readconfig <file>\n")
+DEF("writeconfig", HAS_ARG, QEMU_OPTION_writeconfig,
+ "-writeconfig <file>\n"
+ " read/write config file")
projects / qemu.git / blobdiff