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Date: Fri, 23 Apr 2010 11:41:18 -1000 From: Zachary Amsden <zamsden@...hat.com> To: Jeremy Fitzhardinge <jeremy@...p.org> CC: Avi Kivity <avi@...hat.com>, Glauber Costa <glommer@...hat.com>, Peter Zijlstra <peterz@...radead.org>, kvm@...r.kernel.org, linux-kernel@...r.kernel.org, Marcelo Tosatti <mtosatti@...hat.com> Subject: Re: [PATCH 1/5] Add a global synchronization point for pvclock On 04/23/2010 11:35 AM, Jeremy Fitzhardinge wrote: > On 04/23/2010 02:31 PM, Zachary Amsden wrote: > >> Does lfence / mfence actually serialize? I thought there was some >> great confusion about that not being the case on all AMD processors, >> and possibly not at all on Intel. >> >> A trap, however is a great way to serialize. >> >> I think, there is no serializing instruction which can be used from >> userspace which does not trap, at least, I don't know one off the top >> of my head. >> > rsm is not technically privileged... but not quite usable from usermode ;) > rsm under hardware virtualization makes my head hurt -- 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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