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Date:	Wed, 14 Jul 2010 22:32:45 -0400
From:	Rik van Riel <>
To:	Zachary Amsden <>
CC:	KVM <>, Avi Kivity <>,
	Marcelo Tosatti <>,
	Glauber Costa <>,
	Linux-kernel <>
Subject: Re: [PATCH 12/18] Add clock sync request to hardware enable

On 07/12/2010 10:25 PM, Zachary Amsden wrote:
> If there are active VCPUs which are marked as belonging to
> a particular hardware CPU, request a clock sync for them when
> enabling hardware; the TSC could be desynchronized on a newly
> arriving CPU, and we need to recompute guests system time
> relative to boot after a suspend event.
> This covers both cases.
> Note that it is acceptable to take the spinlock, as either
> no other tasks will be running and no locks held (BSP after
> resume), or other tasks will be guaranteed to drop the lock
> relatively quickly (AP on CPU_STARTING).

Acked-by: Rik van Riel <>

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