Shouldn't this get a kernel option, sysctl, test app...? https://www.amd.com/system/files/documents/security-analysis-predictive-store-forwarding.pdf AMD advised customers last week to disable a new performance feature if they plan to use CPUs for sensitive operations, as this feature is vulnerable to Spectre-like side-channel attacks. Called Predictive Store Forwarding (PSF), this feature was added to AMD CPUs part of the company's Zen 3 core architecture.