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Nested virtualization unbearably slow on Whonix-Host (KVM)

As per version 15.0.1.3.6-developers-only, nested virtualization in Whonix-Host (KVM) is extremely slow.

Meaning booting Whonix VMs in Whonix-Host takes around 3 to 5 minutes. VMs are extremely slow to the point of not being usable at all.

Tested on a i7 processor (4 cores allocated to Whonix-Host) with more than enough RAM.

Nested virtualization is not expected to be fast anyway, but it used to be fast enough for testing purposes.

See https://phabricator.whonix.org/T914 for the related discussion.

@Patrick please advise on how to add the relevant tags here. Couldn’t find the option.

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@HulaHoop any idea?

Answered here just now: abolishing Whonix phabricator issue tracker, moving issue tracking to forums, migrating phabricator.whonix.org to forums.whonix.org

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