If you're like me, you'll sometimes forget to tweak one area of the BIOS or another on a server once you've racked it and are ready to install applications. This can also happen if you are repurposing servers after a P-V migration, or upgrading applications. (I have a tendency to forget VT-X enablement, myself) Now, this can mean either a trip back to the datacenter, or into the server room, which, depending on where that is located, could be quite the hike. If you have a truly remote datacenter - you may be stuck for a while.
Luckily, with Dell hardware, there's a way to do this without leaving the comfort of your desk chair. I use the Dell OpenManage software to keep tabs on most the PowerEdge hardware I look after. If you're lucky enough to have this problem on a Dell server, there's a command line bios tool that you can use to edit things that take effect on reboot.
First, ensure that you have OpenManage installed - I generally download and install from Dell directly: v7.2.0 is the latest
Once OpenManage is installed, navigate to the following directory:
omconfig.exe is your savior. Using this program, you can set most BIOS options from within your OS. For BIOS settings, you can get all your options via the following:
This will list all your settable attributes.
The one I'm looking for right now, is :
Now that you know what you're looking for - it's easy to script! in my case of forgetting VT-x, all I needed was the following:
Reboot, and just like that I have a hypervisor-capable processor.