> Unfortunately, that's all we have right now in the official > documentation. > > I've put up some notes in > https://amitshah.net/2024/11/eraps-reduces-software-tax-for-hardware-bugs/ I appreciate the attempt to get a few details out, but this is very confused on bunch of details. Most importantly, you've described Intel RSB underflows, but named it AMD BTC. "Retbleed" is two totally different things. I begged the discoverers to give it two names, and I also begged the x86 maintainers to not alias them in Linux's view of the world, but alas. AMD's BTC comes from a bad branch type prediction, and a late resteer from the ret uop executing. It has nothing to do with RAS/RSB underflow conditions. ~Andrew
