linux-kernel - Re: [PATCH] x86, nmi: workaround sti; hlt race vs nmi; intr

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Message-ID: <4CA06147.7080805@redhat.com>
Date:	Mon, 27 Sep 2010 11:17:59 +0200
From:	Avi Kivity <avi@...hat.com>
To:	Alexander Graf <agraf@...e.de>
CC:	x86@...nel.org, linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Subject: Re: [PATCH] x86, nmi: workaround sti; hlt race vs nmi; intr

  On 09/27/2010 11:15 AM, Alexander Graf wrote:
> >
> >  Wow, this is incredibly ugly :). Can't we just mask NMIs when the interrupt shadow is active?

I plan to do that, for all the code that's out there relying on on STI 
interrupt shadow masking NMIs.

> Yeah, that's me writing without thinking. So this means that the race can also happen on real hardware?
>

Yes.  At least on documented hardware.  Some (most? all?) hardware does 
mask NMIs after STI.

-- 
error compiling committee.c: too many arguments to function

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