Sun Microsystems VIRTUALBOX VERSION 3.1.0_BETA2 - Manual (Page 115)

8 VBoxManage reference
• --synthcpu on|off: This setting determines whether VirtualBox will expose
a synthetic CPU to the guest to allow live migration between host systems that
differ significantly.
• --pae on|off: This enables/disables PAE (see chapter 3.4.2 , “Processor” tab ,
page 48 ).
• --hwvirtex on|off|default: This enables or disables the use of hardware
virtualization extensions (Intel VT-x or AMD-V) in the processor of your host sys-
tem; see chapter
3.4.3 , “Acceleration” tab: hardware vs. software virtualization ,
page 49 .
• --hwvirtexexcl on|off: This specifies whether VirtualBox will make exclu-
sive use of the hardware virtualization extensions (Intel VT-x or AMD-V) in the
processor of your host system; see chapter
3.4.3 , “Acceleration” tab: hardware
vs. software virtualization , page 49 . If you wish to simultaneously share these
extensions with other hypervisors, then you must disable this setting. Doing so
has negative performance implications.
• --nestedpaging on|off: If hardware virtualization is enabled, this addi-
tional setting enables or disables the use of the nested paging feature in the
processor of your host system; see chapter
3.4.3 , “Acceleration” tab: hardware vs.
software virtualization , page 49 .
• --vtxvpid on|off: If hardware virtualization is enabled, for Intel VT-x only,
this additional setting enables or disables the use of the tagged TLB (VPID) fea-
ture in the processor of your host system; see chapter
3.4.3 , “Acceleration” tab:
hardware vs. software virtualization , page 49 .
• --accelerate3d on|off: This enables, if the Guest Additions are installed,
whether hardware 3D acceleration should be available; see chapter 4.9 , Hard-
ware 3D acceleration (OpenGL and Direct3D 8/9) , page 72 .
• You can influence the BIOS logo that is displayed when a virtual machine starts
up with a number of settings. Per default, a VirtualBox logo is displayed.
With --bioslogofadein on|off and --bioslogofadeout on|off, you
can determine whether the logo should fade in and out, respectively.
With --bioslogodisplaytime you can set how long the logo
should be visible, in milliseconds.
With --bioslogoimagepath you can, if you are so inclined,
replace the image that is shown, with your own logo. The image must be an
uncompressed 256 color BMP file.
• --biosbootmenu disabled|menuonly|messageandmenu: This specifies
whether the BIOS allows the user to select a temporary boot device. menuonly
suppresses the message, but the user can still press F12 to select a temporary
boot device.
115