Does Tart support nested virtualization?

[jonathandieu]

I'd like to be able to run Docker Desktop when running workflows with these runners- is that something that's possible using Tart / Cirrus runners?

Thanks in advance

[fkorotkov]

Unfortunately, it's not supported at the moment by the Virtualization.Framework that Tart depends on even though M1/M2/M3 chips have the hardware capabilities.

[jonathandieu]

Thanks for the speedy response! 🙇

[rpendleton]

Looks like Virtualization.framework might be adding support for nested virtualization starting in macOS 15:

https://developer.apple.com/documentation/virtualization/vzgenericplatformconfiguration/4360552-isnestedvirtualizationenabled?changes=latest_minor

[fkorotkov]

Unfortunately only for Linux VMs. Nothing for macOS 😢

[sorenbs]

Does Tart support running a Linux guest with nested virtualization?

[edigaryev]

Please see #933.

[fkorotkov]

As of version 2.20.0 you can enable nested virtualization for Linux VMs by passing --nested flag to tart run.

[sorenbs]

This is great news!

Are you aware of any benchmarks of the overhead of nested virtualization on Apple silicon?