With the new features of Hyper-V in Server 2012 R2 one of those is the Generation 2 VM. There is a lot to be said on this topic but here is a caveat when using Gen2 VM’s for systems older then Windows 8 or Server 2012.
Let’s start with a spoiler:
It doesn’t work for Windows 7 SP1!
If you create a VM the first question will be: a Generation 1 or Generation 2 VM
As you can see it cannot be changed…well it can 😉 (see http://blogs.technet.com/b/jhoward/archive/2013/11/06/hyper-v-generation-2-virtual-machines-part-8.aspx and http://blogs.technet.com/b/jhoward/archive/2013/11/14/hyper-v-generation-2-virtual-machines-part-10.aspx)
So you create a Gen2 VM and want to install Windows 7. Well oké, the installation is going fine. UEFI gets recognized. Everything is good. Then comes the restart…
Hmm not so good. But this is to be expected. Windows 7 does not support Secure Boot! This will be turned off:
Now we try again and see this:
And here is stays, forever.
In the Hyper-V management console we see a lot of CPU Usage so it is doing something 😉
So WHY is this? Windows 7 DOES support UEFI boot. After a search I found this:
Q: Why doesn’t Microsoft support 64-bit Windows 7 or Windows Server 2008 R2 as a guest operating system in generation 2 virtual machines?
A: Certainly it is true that Windows 7 support UEFI, the first requirement for generation 2 virtual machines. However, Windows 7 has a hardware dependency on a Programmable Interrupt Controller (PIC) which is not present in generation 2 virtual machines. Even if Secure Boot is disabled, an attempt to install Windows 7 will result in an apparent hang at “Starting Windows” shortly after boot, consuming high CPU utilization. A similar effect to this will be seen if attempting a network install from a WDS server which has a Windows 7 era boot PE image – network boot will appear to hang as well. For that reason (along with the keyboard issue in Windows 8 PE) I strongly recommend any WDS server are upgraded to the Windows 8.1 PE boot image.
That is pretty clear, NO Windows 7 Generation 2 VM in Hyper-V!
P.S. DO try this with Windows 8.1 – it is incredibly FAST J