# qemu-system-x86_64 -help
QEMU PC emulator version 0.10.50 (qemu-kvm-devel-88), Copyright (c) 2003-2008 Fabrice Bellard
usage: qemu [options] [disk_image]
'disk_image' is a raw hard image image for IDE hard disk 0
Standard options:
-h or -help display this help and exit
-version display version information and exit
-M machine select emulated machine (-M ? for list)
-cpu cpu select CPU (-cpu ? for list)
-smp n set the number of CPUs to 'n' [default=1]
-numa node[,mem=size][,cpus=cpu[-cpu]][,nodeid=node]
-fda/-fdb file use 'file' as floppy disk 0/1 image
-hda/-hdb file use 'file' as IDE hard disk 0/1 image
-hdc/-hdd file use 'file' as IDE hard disk 2/3 image
-cdrom file use 'file' as IDE cdrom image (cdrom is ide1 master)
-drive [file=file][,if=type][,bus=n][,unit=m][,media=d][,index=i]
[,cyls=c,heads=h,secs=s[,trans=t]][,snapshot=on|off]
[,cache=writethrough|writeback|none][,format=f][,serial=s]
[,addr=A]
[,boot=on|off]
use 'file' as a drive image
-mtdblock file use 'file' as on-board Flash memory image
-sd file use 'file' as SecureDigital card image
-pflash file use 'file' as a parallel flash image
-boot [a|c|d|n] boot on floppy (a), hard disk (c), CD-ROM (d), or network (n)
-snapshot write to temporary files instead of disk image files
-m megs set virtual RAM size to megs MB [default=128]
-k language use keyboard layout (for example 'fr' for French)
-audio-help print list of audio drivers and their options
-soundhw c1,... enable audio support
and only specified sound cards (comma separated list)
use -soundhw ? to get the list of supported cards
use -soundhw all to enable all of them
-usb enable the USB driver (will be the default soon)
-usbdevice name add the host or guest USB device 'name'
-name string set the name of the guest
-uuid %08x-%04x-%04x-%04x-%012x
specify machine UUID
Display options:
-nographic disable graphical output and redirect serial I/Os to console
-curses use a curses/ncurses interface instead of SDL
-portrait rotate graphical output 90 deg left (only PXA LCD)
-vga [std|cirrus|vmware|xenfb|none]
select video card type
-full-screen start in full screen
-vnc display start a VNC server on display
1 target only:
-win2k-hack use it when installing Windows 2000 to avoid a disk full bug
-rtc-td-hack use it to fix time drift in Windows ACPI HAL
-no-fd-bootchk disable boot signature checking for floppy disks
-no-acpi disable ACPI
-no-hpet disable HPET
-balloon none disable balloon device
-balloon virtio[,addr=str]
enable virtio balloon device (default)
-acpitable [sig=str][,rev=n][,oem_id=str][,oem_table_id=str][,oem_rev=n][,asl_compiler_id=str][,asl_compiler_rev=n][,data=file1[:file2]...]
ACPI table description
-smbios file=binary
Load SMBIOS entry from binary file
-smbios type=0[,vendor=str][,version=str][,date=str][,release=%d.%d]
Specify SMBIOS type 0 fields
-smbios type=1[,manufacturer=str][,product=str][,version=str][,serial=str]
[,uuid=uuid][,sku=str][,family=str]
Specify SMBIOS type 1 fields
Network options:
-net nic[,vlan=n][,macaddr=mac][,model=type][,name=str][,addr=str][,vectors=v]
create a new Network Interface Card and connect it to VLAN 'n'
-net user[,vlan=n][,name=str][,net=addr[/mask]][,host=addr][,restrict=y|n]
[,hostname=host][,dhcpstart=addr][,dns=addr][,tftp=dir][,bootfile=f]
[,hostfwd=rule][,guestfwd=rule][,smb=dir[,smbserver=addr]]
connect the user mode network stack to VLAN 'n', configure its
DHCP server and enabled optional services
-net tap[,vlan=n][,name=str][,fd=h][,ifname=name][,script=file][,downscript=dfile]
connect the host TAP network interface to VLAN 'n' and use the
network scripts 'file' (default=/etc/qemu-ifup)
and 'dfile' (default=/etc/qemu-ifdown);
use '[down]script=no' to disable script execution;
use 'fd=h' to connect to an already opened TAP interface
-net socket[,vlan=n][,name=str][,fd=h][,listen=[host]:port][,connect=host:port]
connect the vlan 'n' to another VLAN using a socket connection
-net socket[,vlan=n][,name=str][,fd=h][,mcast=maddr:port]
connect the vlan 'n' to multicast maddr and port
-net dump[,vlan=n][,file=f][,len=n]
dump traffic on vlan 'n' to file 'f' (max n bytes per packet)
-net none use it alone to have zero network devices; if no -net option
is provided, the default is '-net nic -net user'
-bt hci,null dumb bluetooth HCI - doesn't respond to commands
-bt hci,host[:id]
use host's HCI with the given name
-bt hci[,vlan=n]
emulate a standard HCI in virtual scatternet 'n'
-bt vhci[,vlan=n]
add host computer to virtual scatternet 'n' using VHCI
-bt device:dev[,vlan=n]
emulate a bluetooth device 'dev' in scatternet 'n'
Linux/Multiboot boot specific:
-kernel bzImage use 'bzImage' as kernel image
-append cmdline use 'cmdline' as kernel command line
-initrd file use 'file' as initial ram disk
Debug/Expert options:
-serial dev redirect the serial port to char device 'dev'
-parallel dev redirect the parallel port to char device 'dev'
-monitor dev redirect the monitor to char device 'dev'
-pidfile file write PID to 'file'
-singlestep always run in singlestep mode
-S freeze CPU at startup (use 'c' to start execution)
-gdb dev wait for gdb connection on 'dev'
-s shorthand for -gdb tcp::1234
-d item1,... output log to /tmp/qemu.log (use -d ? for a list of log items)
-hdachs c,h,s[,t]
force hard disk 0 physical geometry and the optional BIOS
translation (t=none or lba) (usually qemu can guess them)
-L path set the directory for the BIOS, VGA BIOS and keymaps
-bios file set the filename for the BIOS
-no-reboot exit instead of rebooting
-no-shutdown stop before shutdown
-loadvm [tag|id]
start right away with a saved state (loadvm in monitor)
-daemonize daemonize QEMU after initializing
-option-rom rom load a file, rom, into the option ROM space
-clock force the use of the given methods for timer alarm.
To see what timers are available use -clock ?
-localtime set the real time clock to local time [default=utc]
-startdate select initial date of the clock
-icount [N|auto]
enable virtual instruction counter with 2^N clock ticks per
instruction
-watchdog i6300esb|ib700
enable virtual hardware watchdog [default=none]
-watchdog-action reset|shutdown|poweroff|pause|debug|none
action when watchdog fires [default=reset]
-echr chr set terminal escape character instead of ctrl-a
-virtioconsole c
set virtio console
-show-cursor show cursor
-tb-size n set TB size
-incoming p prepare for incoming migration, listen on port p
-chroot dir Chroot to dir just before starting the VM.
-runas user Change to user id user just before starting the VM.
-no-kvm disable KVM hardware virtualization
-no-kvm-irqchip disable KVM kernel mode PIC/IOAPIC/LAPIC
-no-kvm-pit disable KVM kernel mode PIT
-no-kvm-pit-reinjection disable KVM kernel mode PIT interrupt reinjection
-pcidevice host=bus:dev.func[,dma=none][,name=string]
expose a PCI device to the guest OS.
dma=none: don't perform any dma translations (default is to use an iommu)
'string' is used in log output.
-enable-nesting enable support for running a VM inside the VM (AMD only)
-nvram FILE provide ia64 nvram contents
-tdf enable guest time drift compensation
-kvm-shadow-memory MEGABYTES
allocate MEGABYTES for kvm mmu shadowing
-mem-path FILE provide backing storage for guest RAM
-mem-prealloc preallocate guest memory (use with -mempath)
During emulation, the following keys are useful:
ctrl-alt-f toggle full screen
ctrl-alt-n switch to virtual console 'n'
ctrl-alt toggle mouse and keyboard grab
When using -nographic, press 'ctrl-a h' to get some help.
