When having problems with deploying Virtual Machine the firs step is to troubleshoot it as normal Pods. If it doesn't help then you need to check Virtlet logs. You can do it manually or by using virtletctl diag command:

mkdir dump_data
virtletctl diag dump dump_data/

It will download all required logs and statuses from all nodes where Virtlet is installed:

ls dump_data/nodes

For more info, see Diagnostics in Virtlet Reference.