8VBoxManage reference
•--synthcpu onoff: This setting determines whether VirtualBox will expose a synthetic CPU to the guest to allow live migration between host systems that differ significantly.
•--pae onoff: This enables/disables PAE (see chapter 3.4.2, “Processor” tab, page 48).
•--hwvirtex onoffdefault: 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 onoff: 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 onoff: 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 onoff: 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 onoff: 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 onoff and --bioslogofadeout onoff, you can determine whether the logo should fade in and out, respectively.
With --bioslogodisplaytime <msec> you can set how long the logo should be visible, in milliseconds.
With --bioslogoimagepath <imagepath> 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 disabledmenuonlymessageandmenu: 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.
