[root@Centos72 libvirt]#qemu-kvm -h

QEMU emulator version 1.5. (qemu-kvm-1.5.-.el7_5.), Copyright (c) - Fabrice Bellard

WARNING: Direct use of qemu-kvm from the command line is not supported by Red Hat.

WARNING: Use libvirt as the stable management interface.

WARNING: Some command line options listed here may not be available in future releases.

usage: qemu-kvm [options] [disk_image]

'disk_image' is a raw hard disk image for IDE hard disk 

Standard options:        #标准选项

-h or -help     display this help and exit

-version        display version information and exit

-machine [type=]name[,prop[=value][,...]]

                selects emulated machine ('-machine help' for list)

                property accel=accel1[:accel2[:...]] selects accelerator

                supported accelerators are kvm, xen, tcg (default: tcg)

                kernel_irqchip=on|off controls accelerated irqchip support

                kvm_shadow_mem=size of KVM shadow MMU

                dump-guest-core=on|off include guest memory in a core dump (default=on)

                mem-merge=on|off controls memory merge support (default: on)

-cpu cpu        select CPU ('-cpu help' for list)

-smp n[,maxcpus=cpus][,cores=cores][,threads=threads][,sockets=sockets]

                set the number of CPUs to 'n' [default=]

                maxcpus= maximum number of total cpus, including

                offline CPUs for hotplug, etc

                cores= number of CPU cores on one socket

                threads= number of threads on one CPU core

                sockets= number of discrete sockets in the system

-numa node[,mem=size][,cpus=cpu[-cpu]][,nodeid=node]

-add-fd fd=fd,set=set[,opaque=opaque]

                Add 'fd' to fd 'set'

-set group.id.arg=value

                set <arg> parameter for item <id> of type <group>

                i.e. -set drive.$id.file=/path/to/image

-global driver.prop=value

                set a global default for a driver property

-boot [order=drives][,once=drives][,menu=on|off]

      [,splash=sp_name][,splash-time=sp_time][,reboot-timeout=rb_time][,strict=on|off]

                'drives': floppy (a), hard disk (c), CD-ROM (d), network (n)

                'sp_name': the file's name that would be passed to bios as logo picture, if menu=on

                'sp_time': the period that splash picture last if menu=on, unit is ms

                'rb_timeout': the timeout before guest reboot when boot failed, unit is ms

-m megs         set virtual RAM size to megs MB [default=]

-mem-path FILE  provide backing storage for guest RAM

-mem-prealloc   preallocate guest memory (use with -mem-path)

-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 help' to get the list of supported cards

                use '-soundhw all' to enable all of them

-balloon none   disable balloon device

-balloon virtio[,addr=str]

                enable virtio balloon device (default)

-device driver[,prop[=value][,...]]

                add device (based on driver)

                prop=value,... sets driver properties

                use '-device help' to print all possible drivers

                use '-device driver,help' to print all possible properties

-name string1[,process=string2]

                set the name of the guest

                string1 sets the window title and string2 the process name (on Linux)

-uuid %08x-%04x-%04x-%04x-%012x

                specify machine UUID

Block device options:   #块设备选项

-fda/-fdb file  use 'file' as floppy disk / image

-hda/-hdb file  use 'file' as IDE hard disk / image

-hdc/-hdd file  use 'file' as IDE hard disk / 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|directsync|unsafe][,format=f]

       [,serial=s][,addr=A][,id=name][,aio=threads|native]

       [,readonly=on|off][,copy-on-read=on|off]

       [[,bps=b]|[[,bps_rd=r][,bps_wr=w]]][[,iops=i]|[[,iops_rd=r][,iops_wr=w]]

                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

-snapshot       write to temporary files instead of disk image files

-hdachs c,h,s[,t]

                force hard disk  physical geometry and the optional BIOS

                translation (t=none or lba) (usually QEMU can guess them)

-fsdev fsdriver,id=id[,path=path,][security_model={mapped-xattr|mapped-file|passthrough|none}]

 [,writeout=immediate][,readonly][,socket=socket|sock_fd=sock_fd]

-virtfs local,path=path,mount_tag=tag,security_model=[mapped-xattr|mapped-file|passthrough|none]

        [,writeout=immediate][,readonly][,socket=socket|sock_fd=sock_fd]

-virtfs_synth Create synthetic file system image

USB options:　　　　　　# usb选项

-usb            enable the USB driver (will be the default soon)

-usbdevice name add the host or guest USB device 'name'

Display options:

-display sdl[,frame=on|off][,alt_grab=on|off][,ctrl_grab=on|off]

            [,window_close=on|off]|curses|none|

            vnc=<display>[,<optargs>]

                select display type

-nographic      disable graphical output and redirect serial I/Os to console

-curses         use a curses/ncurses interface instead of SDL

-no-frame       open SDL window without a frame and window decorations

-alt-grab       use Ctrl-Alt-Shift to grab mouse (instead of Ctrl-Alt)

-ctrl-grab      use Right-Ctrl to grab mouse (instead of Ctrl-Alt)

-no-quit        disable SDL window close capability

-sdl            enable SDL

-spice [port=port][,tls-port=secured-port][,x509-dir=<dir>]

       [,x509-key-file=<file>][,x509-key-password=<file>]

       [,x509-cert-file=<file>][,x509-cacert-file=<file>]

       [,x509-dh-key-file=<file>][,addr=addr][,ipv4|ipv6]

       [,tls-ciphers=<list>]

       [,tls-channel=[main|display|cursor|inputs|record|playback]]

       [,plaintext-channel=[main|display|cursor|inputs|record|playback]]

       [,sasl][,password=<secret>][,disable-ticketing]

       [,image-compression=[auto_glz|auto_lz|quic|glz|lz|off]]

       [,jpeg-wan-compression=[auto|never|always]]

       [,zlib-glz-wan-compression=[auto|never|always]]

       [,streaming-video=[off|all|filter]][,disable-copy-paste]

       [,agent-mouse=[on|off]][,playback-compression=[on|off]]

       [,seamless-migration=[on|off]]

   enable spice

   at least one of {port, tls-port} is mandatory

-portrait       rotate graphical output  deg left (only PXA LCD)

-rotate <deg>   rotate graphical output some deg left (only PXA LCD)

-vga [std|cirrus|vmware|qxl|xenfb|none]

                select video card type

-full-screen    start in full screen

-vnc display    start a VNC server on display

i386 target only:

-win2k-hack     use it when installing Windows  to avoid a disk full bug

-no-fd-bootchk  disable boot signature checking for floppy disks

-no-acpi        disable ACPI

-no-hpet        disable HPET

-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]...]

                ACPI table description

-smbios file=binary

                load SMBIOS entry from binary file

-smbios type=[,vendor=str][,version=str][,date=str][,release=%d.%d]

                specify SMBIOS type  fields

-smbios type=[,manufacturer=str][,product=str][,version=str][,serial=str]

              [,uuid=uuid][,sku=str][,family=str]

                specify SMBIOS type  fields

Network options:　　　　　　# 网络选项

-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=on|off]

         [,hostname=host][,dhcpstart=addr][,dns=addr][,dnssearch=domain][,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][,fds=x:y:...:z][,ifname=name][,script=file][,downscript=dfile][,helper=helper][,sndbuf=nbytes][,vnet_hdr=on|off][,vhost=on|off][,vhostfd=h][,vhostfds=x:y:...:z][,vhostforce=on|off][,queues=n]

                connect the host TAP network interface to VLAN 'n'

                use network scripts 'file' (default=/etc/qemu-ifup)

                to configure it and 'dfile' (default=/etc/qemu-ifdown)

                to deconfigure it

                use '[down]script=no' to disable script execution

                use network helper 'helper' (default=/usr/libexec/qemu-bridge-helper) to

                configure it

                use 'fd=h' to connect to an already opened TAP interface

                use 'fds=x:y:...:z' to connect to already opened multiqueue capable TAP interfaces

                use 'sndbuf=nbytes' to limit the size of the send buffer (the

                default is disabled 'sndbuf=0' to enable flow control set 'sndbuf=1048576')

                use vnet_hdr=off to avoid enabling the IFF_VNET_HDR tap flag

                use vnet_hdr=on to make the lack of IFF_VNET_HDR support an error condition

                use vhost=on to enable experimental in kernel accelerator

                    (only has effect for virtio guests which use MSIX)

                use vhostforce=on to force vhost on for non-MSIX virtio guests

                use 'vhostfd=h' to connect to an already opened vhost net device

                use 'vhostfds=x:y:...:z to connect to multiple already opened vhost net devices

                use 'queues=n' to specify the number of queues to be created for multiqueue TAP

-net bridge[,vlan=n][,name=str][,br=bridge][,helper=helper]

                connects a host TAP network interface to a host bridge device 'br'

                (default=br0) using the program 'helper'

                (default=/usr/libexec/qemu-bridge-helper)

-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[,localaddr=addr]]

                connect the vlan 'n' to multicast maddr and port

                use 'localaddr=addr' to specify the host address to send packets from

-net socket[,vlan=n][,name=str][,fd=h][,udp=host:port][,localaddr=host:port]

                connect the vlan 'n' to another VLAN using an UDP tunnel

-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'

-netdev [user|tap|bridge|socket|hubport],id=str[,option][,option][,...]

Character device options:

-chardev null,id=id[,mux=on|off]

-chardev socket,id=id[,host=host],port=host[,to=to][,ipv4][,ipv6][,nodelay]

         [,server][,nowait][,telnet][,mux=on|off] (tcp)

-chardev socket,id=id,path=path[,server][,nowait][,telnet],[mux=on|off] (unix)

-chardev udp,id=id[,host=host],port=port[,localaddr=localaddr]

         [,localport=localport][,ipv4][,ipv6][,mux=on|off]

-chardev msmouse,id=id[,mux=on|off]

-chardev vc,id=id[[,width=width][,height=height]][[,cols=cols][,rows=rows]]

         [,mux=on|off]

-chardev ringbuf,id=id[,size=size]

-chardev file,id=id,path=path[,mux=on|off]

-chardev pipe,id=id,path=path[,mux=on|off]

-chardev pty,id=id[,mux=on|off]

-chardev stdio,id=id[,mux=on|off][,signal=on|off]

-chardev serial,id=id,path=path[,mux=on|off]

-chardev tty,id=id,path=path[,mux=on|off]

-chardev parallel,id=id,path=path[,mux=on|off]

-chardev parport,id=id,path=path[,mux=on|off]

-chardev spicevmc,id=id,name=name[,debug=debug]

-chardev spiceport,id=id,name=name[,debug=debug]

Device URL Syntax:

-iscsi [user=user][,password=password]

       [,header-digest=CRC32C|CR32C-NONE|NONE-CRC32C|NONE

       [,initiator-name=initiator-iqn][,id=target-iqn]

                iSCSI session parameters

Bluetooth(R) options:

-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

-dtb    file    use 'file' as device tree image

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'

-qmp dev        like -monitor but opens in 'control' mode

-mon chardev=[name][,mode=readline|control][,default]

-debugcon dev   redirect the debug console 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)

-realtime [mlock=on|off]

                run qemu-kvm with realtime features

                mlock=on|off controls mlock support (default: on)

-gdb dev        wait for gdb connection on 'dev'

-s              shorthand for -gdb tcp::

-d item1,...    enable logging of specified items (use '-d help' for a list of log items)

-D logfile      output log to logfile (default stderr)

-L path         set the directory for the BIOS, VGA BIOS and keymaps

-bios file      set the filename for the BIOS

-enable-kvm     enable KVM full virtualization support

-xen-domid id   specify xen guest domain id

-xen-create     create domain using xen hypercalls, bypassing xend

                warning: should not be used when xend is in use

-xen-attach     attach to existing xen domain

                xend will use this when starting QEMU

-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 help'

-rtc [base=utc|localtime|date][,clock=host|rt|vm][,driftfix=none|slew]

                set the RTC base and clock, enable drift fix for clock ticks (x86 only)

-icount [N|auto]

                enable virtual instruction counter with ^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

-nodefaults     don't create default devices

-chroot dir     chroot to dir just before starting the VM

-runas user     change to user id user just before starting the VM

-sandbox <arg>  Enable seccomp mode  system call filter (default 'off').

-readconfig <file>

-writeconfig <file>

                read/write config file

-nodefconfig

                do not load default config files at startup

-no-user-config

                do not load user-provided config files at startup

-trace [events=<file>][,file=<file>]

                specify tracing options

-enable-fips    enable FIPS - compliance

-object TYPENAME[,PROP1=VALUE1,...]

                create an new object of type TYPENAME setting properties

                in the order they are specified.  Note that the 'id'

                property must be set.  These objects are placed in the

                '/objects' path.

-msg timestamp[=on|off]

                change the format of messages

                on|off controls leading timestamps (default:on)

-dump-vmstate <file>

                Output vmstate information in JSON format to file.

                Use the scripts/vmstate-static-checker.py file to

                check for possible regressions in migration code

                by comparing two such vmstate dumps.

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.

WARNING: Direct use of qemu-kvm from the command line is not supported by Red Hat.

WARNING: Use libvirt as the stable management interface.

WARNING: Some command line options listed here may not be available in future releases.