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

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Message-ID: <4BCD7643.4000102@redhat.com>
Date:	Tue, 20 Apr 2010 12:39:15 +0300
From:	Avi Kivity <avi@...hat.com>
To:	Zachary Amsden <zamsden@...hat.com>
CC:	Peter Zijlstra <peterz@...radead.org>,
	Glauber Costa <glommer@...hat.com>, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	Marcelo Tosatti <mtosatti@...hat.com>
Subject: Re: [PATCH 1/5] Add a global synchronization point for pvclock

On 04/19/2010 09:35 PM, Zachary Amsden wrote:
>>>> Sockets and boards too?  (IOW, how reliable is TSC_RELIABLE)?
>>> Not sure, IIRC we clear that when the TSC sync test fails, eg when we
>>> mark the tsc clocksource unusable.
>>
>> Worrying.  By the time we detect this the guest may already have 
>> gotten confused by clocks going backwards.
>
>
> Upstream, we are marking the TSC unstable preemptively when hardware 
> which will eventually sync test is detected, so this should be fine.

ENOPARSE?

-- 
Do not meddle in the internals of kernels, for they are subtle and quick to panic.

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