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Date: Wed, 14 Sep 2011 10:00:07 +0300 From: Avi Kivity <avi@...hat.com> To: Don Zickus <dzickus@...hat.com> CC: Andi Kleen <andi@...stfloor.org>, 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 09/13/2011 10:21 PM, Don Zickus wrote: > Or are you saying an NMI in an idle system will have the same %rip thus > falsely detecting a back-to-back NMI? > > That's easy to avoid - insert an instruction zeroing the last nmi_rip somewhere before or after hlt. It's always okay to execute such an instruction (outside the nmi handler itself), since nmi_rip is meant to detect a "no instructions executed" condition. -- I have a truly marvellous patch that fixes the bug which this signature is too narrow to contain. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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