From mboxrd@z Thu Jan  1 00:00:00 1970
From: Andi Kleen <andi@firstfloor.org>
Subject: Re: [PATCH 08/13] xen/pvticketlock: disable interrupts
	while blocking
Date: Wed, 14 Sep 2011 21:34:37 +0200
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To: Avi Kivity <avi@redhat.com>
Cc: Don Zickus <dzickus@redhat.com>, Jeremy Fitzhardinge <jeremy@goop.org>, Marcelo Tosatti <mtosatti@redhat.com>, Nick Piggin <npiggin@kernel.dk>, KVM <kvm@vger.kernel.org>, Stefano Stabellini <stefano.stabellini@eu.citrix.com>, Peter Zijlstra <peterz@infradead.org>, the arch/x86 maintainers <x86@kernel.org>, Linux Kernel Mailing List <linux-kernel@vger.kernel.org>, Andi Kleen <andi@firstfloor.org>, Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>, "H. Peter Anvin" <hpa@zytor.com>, Ingo Molnar <mingo@elte.hu>, Linus Torvalds <torvalds@linux-foundation.org>, Xen Devel <xen-devel@lists.xensource.com>
List-Id: xen-devel@lists.xenproject.org

On Wed, Sep 14, 2011 at 10:26:21PM +0300, Avi Kivity wrote:
> On 09/14/2011 08:28 PM, Andi Kleen wrote:
> >>  If an NMI hits in an interrupt handler, or in the "after hlt" section
> >>  before the write-to-last-nmi-rip, then we'll see that %rip has changed.
> >>  If it hits after the write-to-last-nmi-rip instruction (or in the hlt
> >>  itself), then we'll also see that %rip has changed, due to the effect of
> >>  that instruction.
> >
> >It won't handle multiple NMIs in halt. I assume that's reasonable common.
> >
> 
> Why not?

They all have the same original RIPs and there is no way to distingush
them.

-Andi

-- 
ak@linux.intel.com -- Speaking for myself only.