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"Nested Hyper-V" is finally officially available even in client OS environments equipped with AMD CPUs became possible.
Nested Hyper-V is a technology that uses Hyper-V to run a virtual machine in a virtual machine created in a Hyper-V environment.
Microsoft's documentation calls it "nested virtualization," but it's a feature already supported by the client OS since the Windows 10 Anniversary Update provided in August 2016.
However, as described in the document below, as a prerequisite, "Nesting is currently supported only by Intel", it was not available on machines with AMD CPUs.
The above document was published in 2016, and in 2020 Nested Hyper-V for AMD was provided as a preview for Windows Insiders. Hyper-V is now officially available for AMD CPUs.
Nested Hyper-V was originally developed for Hyper-V containers, but it is often used for verification purposes. In terms of Windows 11, if you want to verify WSL2 or support Android apps, which will be a new function to be installed in the future, if you can use Nested Hyper-V, verification can be completed in a virtual machine.
Of course, it is also useful for corporate users when verifying migration of servers to Hyper-V environment, and for general users who want to try the functions of Windows 11, hypothetically, a virtual environment is necessary. Even so, I am grateful that the test can be completed only in the virtual environment on the client PC at hand without preparing the actual machine.