While I'm sure they are off-topic there
The first thing, which I cannot stress enough, are what is considered topical on StackOverflow:
- a specific programming problem
- a software algorithm
- software tools commonly used by programmers
- practical, answerable problems that are unique to software development
Remember that development tools are perfectly on-topic on SO. If they question relates to, say, debugging in a VM, then it is on-topic on SO. We get far too many migrations from people who don't seem to know that.
The second thing is the general "don't migrate crap" policy - keep in mind that you don't have to migrate, and some questions are better off being closed straight away.
That said, if it is a question about the general usage of a VM, and is good enough to migrate, you may find yourself having to decide whether it belongs on SU or SF. In most cases, general usage would end up on SU.
SF also has a specific line on virtualisation:
- Business/Enterprise grade virtualization
For what this means, you really should consult their meta, which of course has differing opinions. Generally, you're looking at either bare-metal hypervisors or deployment across many machines - running a single hosted hypervisor VM probably won't be received well.
Of course, there is no public migration path from SO to SF anymore.