VirtualBox

Ticket #2107 (new enhancement)

Opened 6 years ago

Last modified 5 years ago

Feature request: Predefined absolute time for Guest

Reported by: A20_user Owned by:
Priority: minor Component: VMM
Version: VirtualBox 2.0.0 Keywords: absolute time
Cc: Guest type: Windows
Host type: Windows

Description

Please add an option to set Guest time to a fixed value at startup. This is a feature for repeatable software tests.

Change History

comment:1 Changed 6 years ago by sandervl73

  • Summary changed from Predefined absolute time for Guest to Feature request: Predefined absolute time for Guest

comment:2 Changed 6 years ago by sandervl73

There is a -biossystemtimeoffset option in VBoxManage that should do the trick too.

comment:3 Changed 6 years ago by A20_user

The biossystemtimeoffset is an inconvenient but possible workaround. It requires to compute a new offset before every start.

comment:4 Changed 5 years ago by TerryE

See topic  Data in guest and host for a background discussion. ghr pointed out that installing GA cancels out any biossystemtimeoffset parameter setting. Looking at the code for vboxadd-timesync.c and VBoxDev.cpp, the vmmdevTimesyncBackdoorRead just picks up host system time without applying the time offset stored in the BIOS. This isn't a feature enhancement. Surely this is a bug.

comment:5 Changed 5 years ago by vbox4me2

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