Re: https://firmwaresecurity.com/2018/03/17/intel-publishes-pcie-device-security-enhancements-spec/
The PHY Interface for the PCI Express* (PIPE) Architecture Revision 5.1 is an updated version of the PIPE spec that supports PCI Express, SATA, USB, DisplayPort, and Converged I/O architectures.
The review draft PCI Express* Device Security Enhancements Specification Revision 0.7 defines PCIe* Device Firmware Measurement and PCIe* Device Authentication that enable a Host to query and verify the identity and capability of a PCIe* Device, to improve system security.
Firmware Security 