Hi there, I write a piece of code to test the action of Accessed and Dirty bit of EPT in Intel(R) Core(TM) i3-4130 CPU @ 3.40GHz. Firstly I build a totally new EPT paging structure with A/D logging on, then run some operating system codes and log all the EPT violation (say trap log). At some point I paused the OS, parse the EPT paging structure and log all the entries built in the past period (say A/D log).
Here I get some interesting points: 1. Some EPT entries are built without either Accessed or Dirty bit set, does this mean that CPU only construct these entries but doesn't touch them? 2. Some entries only exist in A/D log. Does A/D logging module has some bias or some mistake? These two logs (trap log and A/D log) should be the same according to my understanding, and when I tried in the previous CPU without A/D bit supporting, these two logs are exactly the same, though I just parse the EPT paging structure and cannot distinguish Accessed or Dirty in it. Thanks ahead, Arthur -- Arthur Chunqi Li Department of Computer Science School of EECS Peking University Beijing, China -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
