The XPPU allows protecting peripherals, message buffers, inter-processor interrupts (IPI), communications, and Quad SPI flash memory. To understand more about AMD peripheral protection unit (XPPU) features and functionality, see this link to the “AMD Peripheral Protection Unit” section of the Zynq UltraScale+ Device Technical Reference Manual (UG1085).
For more information on using the XMPU please see Isolation Methods in Zynq UltraScale+ MPSoCs (XAPP1320).