I do in fact mention this idea in the article. In fact userfaultfd was added to the kernel so that CRIU and KVM live migration could implement exactly this.
Another cool project that does something like this is https://github.com/gamozolabs/chocolate_milk which is a fuzzing hypervisor kernel which can back a VM snapshot memory mapping over the network to only pull down the pages that the VM actually reads during the fuzz case.
Another cool project that does something like this is https://github.com/gamozolabs/chocolate_milk which is a fuzzing hypervisor kernel which can back a VM snapshot memory mapping over the network to only pull down the pages that the VM actually reads during the fuzz case.