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[Xen-devel] Re: [PATCH 1/5] Add a global synchronization point for pvclo

To: Jeremy Fitzhardinge <jeremy@xxxxxxxx>
Subject: [Xen-devel] Re: [PATCH 1/5] Add a global synchronization point for pvclock
From: Avi Kivity <avi@xxxxxxxxxx>
Date: Tue, 26 Oct 2010 10:14:25 +0200
Cc: Marcelo Tosatti <mtosatti@xxxxxxxxxx>, kvm@xxxxxxxxxxxxxxx, Glauber Costa <glommer@xxxxxxxxxx>, Zachary Amsden <zamsden@xxxxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx, "Xen-devel@xxxxxxxxxxxxxxxxxxx" <Xen-devel@xxxxxxxxxxxxxxxxxxx>
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 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

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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