Re: [PATCH v4] x86/power: Fix 'nosmt' vs. hibernation triple fault during resume

[Jiri Kosina]

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