A hypervisor that prevents vendor lock-in is:

A proprietary hypervisor is controlled exclusively by one vendor, which is the definition of vendor lock-in - customers become dependent on that vendor's roadmap, pricing, and compatibility decisions.

An integrated hypervisor is typically embedded within a vendor's hardware or platform stack, deepening dependency on that specific vendor's ecosystem rather than reducing it.

Open source hypervisors such as KVM and Xen are freely available and community-developed, meaning organizations are not tied to a specific vendor's licensing, pricing, or support lifecycle. This portability allows workloads to move across different hardware platforms and cloud providers without proprietary dependencies.

A 'framework hypervisor' is not a recognized standard industry classification and does not describe any known hypervisor category associated with portability or open standards.