2011
08.22

I just noticed a new patch was added to the list on the TechNet wiki for Hyper-V on Windows Server 2008 R2 Service Pack 1 (W2008 R2 SP1).  There are 2 scenarios:

Issue 1

  • You have an AMD CPU that supports the Advanced Vector Extensions (AVX) feature on a computer that is running Windows Server 2008 R2 RTM.
    Note AMD introduced support for the AVX feature in Bulldozer-based multicore processors.
  • You install the Hyper-V server role on the computer.
  • You create a virtual machine on the computer, and then you try to start the virtual machine.

In this scenario, the virtual machine does not start, and you receive an error message that resembles the following:`

<Virtual machine name> could not initialize.

This issue occurs because Windows Server 2008 R2 RTM does not support the AVX feature.

Issue 2

  • You have an AMD CPU that supports the AVX feature on a computer that is running Windows Server 2008 R2 Service Pack 1 (SP1). 
    Note AMD introduced support for the AVX feature in Bulldozer-based multicore processors.
  • You install the Hyper-V server role on the computer.
  • You create a virtual machine on the computer, and then you try to start the virtual machine.

In this scenario, the virtual machine does not start, and you receive the following error message:

Virtual machine could not start because the hypervisor is not running.

Additionally, the following event is added to the Microsoft-Windows-Hyper-V-Worker-Admin log:

Source: Microsoft-Windows-Hyper-V-Worker
Event ID: 3112
Level: Error
Description:
The virtual machine could not be started because the hypervisor is not running

This issue occurs because Windows Server 2008 R2 SP1 does not support the AVX feature on AMD processors.

You can download the hotfix to resolve this issue.

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