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I have installed ubuntu alongside windows 7/8 on my machine. Is it possible to run my windows instance as a KVM virtual machine?

Do I have to install windows again in KVM?

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You need specific drivers inside KVM during installation of a windows system or else the system won't recognise the virtual harddrive. So you presumably need to reinstall it in KVM. – chaos Oct 16 '13 at 20:06

According to KVM's documentation Windows 7 and 8 are both supported, but may need extra drivers for the virtual disks, depending on what options you use (virtio is advantageous, but often requires drivers).

You will have to reinstall Windows again to run it in KVM.

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