Speaker
Nikunj Dadhania
Description
TSC value calculations for guests are controlled by the hypervisor. A malicious hypervisor can prevent guests from moving forward. The Secure TSC feature for SEV-SNP allows guests to securely use RDTSC and RDTSCP instructions. This ensures the guest gets a consistent view of time and can prevent a malicious hypervisor from making it appear that time rolls backwards, increments at a ridiculously fast rate, or similar tricks. In this talk we will discuss the Secure TSC changes needed to support hypervisor/guest and current upstreaming status.
