Do not build Intel content restriction modules #705
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DemiMarie
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INTEL_MEI_HDCP and DRM_AMD_DC_PDCP are for High-bandwidth Digital Content Protection (HDCP), and INTEL_MEI_PXP is for Protected Xe Path (PXP). Since the Intel CSME and AMD Secure Processor must never be passed through to a VM, these are only usable if there is an Intel or AMD GPU attached to dom0. However, dom0 does not include any programs that can use these modules, so the modules are unused. Worse, if HDCP *was* used, it would, it would allow external displays (which are not trusted) to communicate with the (closed-source and often out-of-date) Intel CSME or AMD SP firmware, which is even more privileged than dom0.
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These kernel modules are only usable if the GPU is attached to dom0. However, dom0 never has the userspace programs needed to use these modules, so the modules are unused.