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

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Message-ID: <4CC68DE1.1060604@redhat.com>
Date:	Tue, 26 Oct 2010 10:14:25 +0200
From:	Avi Kivity <avi@...hat.com>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
CC:	Glauber Costa <glommer@...hat.com>, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Marcelo Tosatti <mtosatti@...hat.com>,
	Zachary Amsden <zamsden@...hat.com>,
	"Xen-devel@...ts.xensource.com" <Xen-devel@...ts.xensource.com>
Subject: Re: [PATCH 1/5] Add a global synchronization point for pvclock

  On 10/26/2010 01:30 AM, Jeremy Fitzhardinge wrote:
> Unfortunately this is breaking Xen save/restore: if you restore on a
> host which was booted more recently than the save host, causing the
> system time to be smaller.  The effect is that the domain's time leaps
> forward to a fixed point, and stays there until the host catches up to
> the source host...

Shouldn't save/restore also save the timebase?

> I guess last_time needs to be reset on this type of event.  I guess the
> cleanest way would be for pvclock.c to register a sysdev suspend/resume
> handler.

Should be for Xen only; kvm save/restore doesn't involve the guest.

-- 
error compiling committee.c: too many arguments to function

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