Nested Virtualization is not a new idea. In fact, we announced our first preview of Nested Virtualization running on Windows way back in 2015. From that Windows Insider preview to now, Nested...
Updated Jun 13, 2020
Version 2.0
Blog Post
I want to give an update to my earlier comments from Oct 06 2021.
I tested again with a released version of Windows 11 (including November updates) as the host. The performance issue on AMD is still there when nesting is enabled and the guest has Hyper-V installed (no nested guest running). Also given the disappointment that AMD has delayed / not launched Threadripper 5000 models, I recently switched to a system with dual socket Intel XEON 4314.
For the test I measured the build time of bullet3 (https://github.com/bulletphysics/bullet3) with VS2019 in the same Hyper-V Windows 10 guest (it was exported from the AMD host and imported on the Intel host).
AMD host, guest without nesting enabled: 33.6 seconds
AMD host, guest with nesting / hyper-v enabled: 45.4 seconds
Intel host, guest without nesting enabled: 29.4 seconds
Intel host, guest with nesting / hyper-v enabled: 30.3 seconds