linux-kernel - Re: [PATCH 1/5] Add a global synchronization point for pvclock

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Message-ID: <4BD213FE.2000800@redhat.com>
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
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