https://www.theregister.co.uk/2018/05/25/researchers_crack_open_amds_server_vm_encryption/

A group of German researchers have devised a method to thwart the VM security in AMD's server chips.

Dubbed SEVered (PDF), the attack would potentially allow an attacker, or malicious admin who had access to the hypervisor, the ability to bypass AMD's Secure Encrypted Virtualization (SEV) protections.