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Date:	Wed, 14 Sep 2011 10:00:07 +0300
From:	Avi Kivity <avi@...hat.com>
To:	Don Zickus <dzickus@...hat.com>
CC:	Andi Kleen <andi@...stfloor.org>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	Peter Zijlstra <peterz@...radead.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	the arch/x86 maintainers <x86@...nel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Nick Piggin <npiggin@...nel.dk>,
	Marcelo Tosatti <mtosatti@...hat.com>,
	KVM <kvm@...r.kernel.org>,
	Xen Devel <xen-devel@...ts.xensource.com>,
	Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>,
	Stefano Stabellini <stefano.stabellini@...citrix.com>
Subject: Re: [PATCH 08/13] xen/pvticketlock: disable interrupts while blocking

On 09/13/2011 10:21 PM, Don Zickus wrote:
> Or are you saying an NMI in an idle system will have the same %rip thus
> falsely detecting a back-to-back NMI?
>
>

That's easy to avoid - insert an instruction zeroing the last nmi_rip 
somewhere before or after hlt.  It's always okay to execute such an 
instruction (outside the nmi handler itself), since nmi_rip is meant to 
detect a "no instructions executed" condition.

-- 
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.

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