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

To: Don Zickus <dzickus@xxxxxxxxxx>
Subject: [Xen-devel] Re: [PATCH 08/13] xen/pvticketlock: disable interrupts while blocking
From: Andi Kleen <andi@xxxxxxxxxxxxxx>
Date: Tue, 13 Sep 2011 21:58:38 +0200
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>, Avi Kivity <avi@xxxxxxxxxx>, 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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> Or are you saying an NMI in an idle system will have the same %rip thus
> falsely detecting a back-to-back NMI?

Yup.

Another problem is very long running instructions, like WBINVD and some others.
If there's a high frequency NMI it may well hit multiple times in a single
 instance.

-Andi

-- 
ak@xxxxxxxxxxxxxxx -- Speaking for myself only.

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