[inkyoto]

> […] freeze it's state right after the boot and clone it afterwards.

You can't do that easily as devices can be attached, detached or reattached dynamically whilst the VM is running and when it is shut down.

In lieu of the hardware / VM support for device trees, with the existing design, the kernel has to probe each device upon every boot.

[alexey-salmin]

Well it's not an ordinary boot of course, it's a clone and the state on both side of the fence should be faithfully cloned including virtual devices. The guest kernel will have no way of knowing whether it was resumed once or twice.

Applicability is limited, but works well to spin up serverless compute on-demand.