On Fri, 31 May 2019, Andy Lutomirski wrote: > For that matter, what actually happens if we get an SMI while halted? > Does RSM go directly to sleep or does it re-fetch the HLT?
Our mails just crossed, I replied to Josh's mwait() proposal patch a minute ago. HLT is guaranteed to be re-entered if SMM interrupted it, while MWAIT is not. So as a short-term fix for 5.2, I still believe in v4 of my patch that does the mwait->hlt->mwait transition across hibernate/resume, and for 5.3 I can look into forcing it to wait-for-SIPI proper. -- Jiri Kosina SUSE Labs
