Way back in the early days of SU the tag kvm was synonymized to kvm-switch apparently without a whole lot of discussion. But this is resulting in a lot of confusion, as most people seem to expect the tag to refer to linux-kvm.
I just glanced through the tags.
I found that linux-kvm has 281 questions and kvm-switch has 260 questions. However, from a quick glance perhaps a quarter of those questions are actually about linux-kvm and should be retagged.
I also propose that the tag kvm be made a synonym of linux-kvm to direct the majority of people asking about "KVM" to the correct tag.