The Svadu extension modifies the existing verbiage in the Priv Spec around A/D bits in PTEs where the hardware modifies those fields. It further adds control fields to the menvcfg and henvcfg csrs, each named HADE that determine the behavior of A/D bit updates.

Spec author: Aaron Durbin, Ved Shanbhogue

Legacy documents:

• Ratification plan: https://docs.google.com/document/d/1oQnaGGDHvprh-jQyEPebhrqWyiGZ73ub4ElechaS600/
• Status checklist: https://docs.google.com/spreadsheets/d/1sfW_PzKHOSpSkXz2bHSllg5bsp0naLjpKQChIE41LNQ/