9 Advanced topics
"Host BIOS Version"
VBoxManage setextradata "My VM" "VBoxInternal/Devices/pcbios/0/Config/DmiBIOSReleaseDate" "Host BIOS Release Date"
VBoxManage setextradata "My VM" "VBoxInternal/Devices/pcbios/0/Config/DmiBIOSReleaseMajor" 1
VBoxManage setextradata "My VM" "VBoxInternal/Devices/pcbios/0/Config/DmiBIOSReleaseMinor" 2
VBoxManage setextradata "My VM" "VBoxInternal/Devices/pcbios/0/Config/DmiBIOSFirmwareMajor" 3
VBoxManage setextradata "My VM" "VBoxInternal/Devices/pcbios/0/Config/DmiBIOSFirmwareMinor" 4
If a DMI string is not set, the default value of VirtualBox is used. To set an empty string use "<EMPTY>".
Changing this information can be necessary to provide the DMI information of the host to the guest to prevent Windows from asking for a new product key. On Linux hosts the DMI BIOS information can be obtained with
dmidecode
and the DMI system information can be obtained with
dmidecode
9.15Configuring the guest time stamp counter (TSC) to reflect guest execution
By default, VirtualBox keeps all sources of time visible to the guest synchronized to a single time source, the monotonic host time. This reflects the assumptions of many guest operating systems, which expect all time sources to reflect “wall clock” time. In special circumstances it may be useful however to make the TSC (time stamp counter) in the guest reflect the time actually spent executing the guest.
This special TSC handling mode can be enabled on a
VBoxManage setextradata "My VM" "VBoxInternal/TM/TSCTiedToExecution" 1
To revert to the default TSC handling mode use:
VBoxManage setextradata "My VM" "VBoxInternal/TM/TSCTiedToExecution"
Note that if you use the special TSC handling mode with a guest operating system which is very strict about the consistency of time sources you may get a warning or error message about the timing inconsistency. It may also cause clocks to become unreliable with some guest operating systems depending on they use the TSC.
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