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[Xen-devel] Re: [PATCH 08/13] xen/pvticketlock: disable interrupts while

from [Avi Kivity] [Permanent Link][Original]
To: Don Zickus <dzickus@xxxxxxxxxx>
Subject: [Xen-devel] Re: [PATCH 08/13] xen/pvticketlock: disable interrupts while blocking
From: Avi Kivity <avi@xxxxxxxxxx>
Date: Wed, 07 Sep 2011 19:25:24 +0300
Cc: Jeremy Fitzhardinge <jeremy@xxxxxxxx>, Marcelo Tosatti <mtosatti@xxxxxxxxxx>, Nick Piggin <npiggin@xxxxxxxxx>, KVM <kvm@xxxxxxxxxxxxxxx>, Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>, Peter Zijlstra <peterz@xxxxxxxxxxxxx>, the arch/x86 maintainers <x86@xxxxxxxxxx>, Linux Kernel Mailing List <linux-kernel@xxxxxxxxxxxxxxx>, Andi Kleen <andi@xxxxxxxxxxxxxx>, Jeremy Fitzhardinge <jeremy.fitzhardinge@xxxxxxxxxx>, "H. Peter Anvin" <hpa@xxxxxxxxx>, Ingo Molnar <mingo@xxxxxxx>, Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>, Xen Devel <xen-devel@xxxxxxxxxxxxxxxxxxx>
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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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