Messages in this thread | | | Date | Fri, 23 Apr 2010 11:41:18 -1000 | From | Zachary Amsden <> | Subject | Re: [PATCH 1/5] Add a global synchronization point for pvclock |
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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
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