BSD (Berkeley Software Distribution) operating systems, including FreeBSD, NetBSD, and OpenBSD, primarily support full virtualization using the Kernel-based Virtual Machine (KVM) technology. KVM allows these BSD systems to run as virtual machines (VMs) on a host server.

KVM is a hardware-assisted virtualization technology that utilizes the virtualization extensions present in modern CPUs, such as Intel VT-x and AMD-V. It allows the BSD operating systems to run unmodified on the host server, providing near-native performance and compatibility.

With KVM, BSD systems can leverage the capabilities of the host hardware, including CPU, memory, storage, and network resources. They can be managed and orchestrated using standard KVM management tools, such as libvirt and virt-manager, which provide features like VM creation, configuration, and live migration.

It’s worth noting that BSD operating systems also support other virtualization technologies, such as containerization. FreeBSD, for example, has support for the Jails system, which provides lightweight and secure process isolation similar to Linux’s LXC (Linux Containers). However, full virtualization with KVM is the primary virtualization method used for running BSD systems as VMs.