Chris123NT's Blog

Where I rant and rave about all things tech

Windows 8.1 “Blue” Build 9369 Hyper-V UEFI

I’m finally getting around to posting this, but I discovered a rather nifty new feature in Hyper-V in Windows 8.1.

Some of you might recall I put up some pictures on Twitter showcasing new functionality called “Generation 2” Virtual Machines.  These new VMs support UEFI to enable fast boot and secure boot functionality in VMs.  The client OS for these VMs must be x64 and Windows 8 or later.  Here is a screenshot of the VM Creation screen showing the generation selection:



As you can see you have the two options.  One for Gen 1 which is the way things currently are in Hyper-V, and the other for Gen 2 which is the new functionality available through Hyper-V in Windows 8.1.

And here is a screenshot of the HD Partition screen within a VM that shows it is indeed in UEFI mode.  The partition structure is the dead giveaway as it’s GPT.



As you can see, this new feature is fully functional in this build of Windows 8.1.  I have been using it for various test VMs for a few days now and have not noticed any problems with the functionality.  I am very happy with the fact that these VMs boot in half the time as the older style ones did.

Anyway that’s it for now.  Stay tuned for a few more “Blue” related posts I will be doing in the coming days.

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  • Nilay Patel

    about time you post something ;P

  • Josh

    I’m unable to enable HyperV in 8.1. Is there a known trick?

    • Kris

      Maybe your processor doesn’t support SLAT?

      • Josh

        “Add Windows Features” seems to be disabled in the build

        • Chris123NT

          What Build is this? Is this the official preview? If so it works fine here, can you post a screenshot?

April 2013
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