https://www.bleepingcomputer.com/news/security/researchers-bypass-amd-s-sev-virtual-machine-encryption/

Four researchers from the Fraunhofer Institute for Applied and Integrated Safety in Munich, Germany have published a research paper this week detailing a method of recovering data that is normally encrypted by AMD's Secure Encrypted Virtualization (SEV), a safety mechanism designed to encrypt the data of virtual machines running on servers with AMD CPUs.

The research team says their attack, which they named SEVered, is capable of recovering plaintext memory data from guest VMs running on the same server as the VM that's under attack.