stoney cloud: Nested virtualization
From stoney cloud
Abstract
This document describes how to set up nested virtualization on a default installation (until it gets enabled by default).
Nested virtualization permits to start another hypervisor (in our case KVM) inside a virtual machine.
With the current version of Qemu/KVM you can expect a performance of about 25% of the host performance (concerning CPU and Memory access) in a guest within a guest (L2). In the future Qemu/KVM should support Intels Virtual EPT which should give 80% of the host performance for L2.
See:
- http://events.linuxfoundation.org/sites/events/files/cojp13_nakajima.pdf
- https://docs.google.com/file/d/0BzyAwvVlQckedmpobUY1Sm0zNWc/edit
