In particular, this means that you will be able to run 64-bit nested guests under VMware guest hypervisors. With virtualized HV enabled for the outer guest, you should be able to run any guest hypervisor that requires hardware-assisted virtualization. However, Workstation 8, Player 4, Fusion 4, and ESXi 5.0 (or later) offer virtualized HV, so that you can run guest hypervisors which require hardware-assisted virtualization. The hardware-assisted virtualization features of the physical CPU are not typically available in a VM, because most hypervisors (from VMware or others) do not virtualize HV. When running as a guest hypervisor, VMware products also require hardware-assisted virtualization for 64-bit guests on AMD hardware. VMware products require hardware-assisted virtualization for 64-bit guests on Intel hardware. Most hypervisors require hardware-assisted virtualization (HV).

Running Guest Hypervisors with Virtualized HV (See for VMware's official policy on running ESXi as a guest hypervisor.) In particular, ESXi is not supported as a guest operating system, and VMware discourages running ESXi as a guest hypervisor in production environments. Note that no Type 1 hypervisors are supported as guest operating systems under any VMware product. To avoid confusion, we will not consider deeper levels of nesting here. The guest hypervisor is the hypervisor that runs within a VM. The host hypervisor is the hypervisor that runs on the physical hardware.

The inner guest (or nested guest) is the VM that runs within another VM. The outer guest is the VM that runs on physical hardware. The phrase 'running nested VMs' refers to running a VM inside another VM.

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