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

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Message-ID: <4E679AF4.50209@redhat.com>
Date:	Wed, 07 Sep 2011 19:25:24 +0300
From:	Avi Kivity <avi@...hat.com>
To:	Don Zickus <dzickus@...hat.com>
CC:	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>, Andi Kleen <andi@...stfloor.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 09/07/2011 06:56 PM, Don Zickus wrote:
> >
> >  And hope that no other NMI was generated while we're handling this
> >  one.  It's a little... fragile?
>
> No.  If another NMI is generated while we are processing the current one
> it should get latched.  Upon completion of the current one, the cpu should
> jump right back into the nmi exception routine again.  The only downside
> is when multiple NMIs come in during the processing of the current one.
> Only one can be latched, so the others get dropped.

Ah, yes, I remember now.

> But we are addressing
> that.
>

May I ask how?  Detecting a back-to-back NMI?

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

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