Explore the challenges and solutions in implementing remote attestation for AMD SEV-SNP Confidential Virtual Machines. Delve into the role of the Trusted Platform Module (TPM) as a hardware root-of-trust and its limitations in Confidential VM environments. Discover the Secure VM Service Module (SVSM) and its function in providing an isolated environment for privileged modules like virtual TPMs. Examine design and implementation challenges encountered when running a vTPM in the SVSM restricted environment, including aspects of remote attestation, state management, cryptographic support, and execution as a CPL3 module. Gain insights into cutting-edge security measures for confidential computing in this 15-minute conference talk from the Linux Plumbers Conference.