On Tue, Feb 11, 2025 at 03:31:54PM -0800, Dave Hansen wrote: > On 2/11/25 13:18, Huang, Kai wrote: > >>> This requires low-level SGX implementation knowledge to fully > >>> understand. Both what "ETRACK, EBLOCK and EWB" are in the first place, > >>> how they are involved in reclaim and also why EREMOVE doesn't lead to > >>> the same fate. > >> > >> Does it? [I'll dig up Intel SDM to check this] > >> > > I just did. 🙂 > > > > It seems EREMOVE only reads and updates the EPCM entry for the target > > EPC page but won't actually access that EPC page. > > Actually, now that I think about it even more, why would ETRACK or > EBLOCK access the page itself? They seem superficially like they'd be > metadata-only too.
Did a sanity check to SDM. I think you're correct, and also there's zero rational reason them use anything but EPCM (no legit reason to access payload itself). BR, Jarkko
