Are all virtualization (OS/above-OS) utilities DevOps utilities?
I'd say you have touched another, far more fundamental question - what makes a utility a "DevOps" one? That is, how do you measure the "DevOpsness" of a tool and formalize facts in this context?

Possibly, my wish list for DevOpsness of a tool, virtualization tools or other, if they fulfill further criteria down on this list:


Open and interoperable API, both for operational and intelligence needs
Optimized workflows, see "developer experience"
Machine readable configuration as code
User community
Short release cycles
Certificate of software quality which is nowadays yet very ambigous