linux-kernel - Re: [PATCH 12/18] Add clock sync request to hardware enable

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Message-ID: <4C3E734D.2020402@redhat.com>
Date:	Wed, 14 Jul 2010 22:32:45 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Zachary Amsden <zamsden@...hat.com>
CC:	KVM <kvm@...r.kernel.org>, Avi Kivity <avi@...hat.com>,
	Marcelo Tosatti <mtosatti@...hat.com>,
	Glauber Costa <glommer@...hat.com>,
	Linux-kernel <linux-kernel@...r.kernel.org>
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 <riel@...hat.com>

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