Originally posted by trivialfis
The PSP can read and write to the system RAM, L1&2 Caches, CPU registers and PCI-e bus, but the rest of the CPU cannot read or write to it. So the PSP can be used for DRM or security.
For example on an EYPC server running ESXi and 5 VMs. The PSP can encrypt the memory of each VM and the hypervisor separately, so the VM's cannot read each others RAM or the Hypervisor's RAM, and the Hypervisor cannot read the VM's RAM, this closes all sorts of security holes.
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