PPGTT: Dynamic page table allocations, 64 bit addressing, GPU mirroring (2014)

PPGTT is short for the Per-Process Graphics Translation Tables. [1]

It is a feature supported by Intel's Ivy Bridge+, enabling GPU process isolation. This enhances the security by providing a per file descriptor address space / context.

Phoronix has been covering the process of PPGTT development [2]

[1] https://www.phoronix.com/scan.php?page=news_item&px=MTUzNzQ

[2] http://www.phoronix.com/scan.php?page=search&q=PPGTT