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

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Message-ID: <20190531121820.GA3722@amd>
Date:   Fri, 31 May 2019 14:18:20 +0200
From:   Pavel Machek <pavel@....cz>
To:     Jiri Kosina <jikos@...nel.org>
Cc:     Josh Poimboeuf <jpoimboe@...hat.com>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        the arch/x86 maintainers <x86@...nel.org>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Linux PM <linux-pm@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4] x86/power: Fix 'nosmt' vs. hibernation triple fault
 during resume

On Fri 2019-05-31 01:42:02, Jiri Kosina wrote:
> On Thu, 30 May 2019, Josh Poimboeuf wrote:
> 
> > > >     Reviewed-by: Thomas Gleixner <tglx@...utronix.de>
> > > 
> > > Yes, it is, thanks!
> > 
> > I still think changing monitor/mwait to use a fixmap address would be a
> > much cleaner way to fix this.  I can try to work up a patch tomorrow.
> 
> I disagree with that from the backwards compatibility point of view.
> 
> I personally am quite frequently using differnet combinations of 
> resumer/resumee kernels, and I've never been biten by it so far. I'd guess 
> I am not the only one.
> Fixmap sort of breaks that invariant.

If we get less tricky code, it may be worth it...
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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