linux-kernel - Re: [PATCH 08/13] xen/pvticketlock: disable interrupts while blocking

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Message-ID: <4E70FFDD.80405@redhat.com>
Date:	Wed, 14 Sep 2011 22:26:21 +0300
From:	Avi Kivity <avi@...hat.com>
To:	Andi Kleen <andi@...stfloor.org>
CC:	Don Zickus <dzickus@...hat.com>,
	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 09/14/2011 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?

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

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