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Re: [Qemu-devel] [PATCH] kvmclock: Ensure time in migration never goes b

From: Marcelo Tosatti
Subject: Re: [Qemu-devel] [PATCH] kvmclock: Ensure time in migration never goes backward
Date: Mon, 5 May 2014 20:27:10 -0300
User-agent: Mutt/1.5.21 (2010-09-15)

On Mon, May 05, 2014 at 08:26:04PM +0200, Marcin Gibuła wrote:
> >>is it possible to have kvmclock jumping forward?
> >>
> >>Because I've reproducible case when at about 1 per 20 vm restores, VM 
> >>freezes for couple of hours and then resumes with date few hundreds years 
> >>ahead. Happens only with kvmclock.
> >>
> >>And this patch seems to fix very similar issue so maybe it's all the same 
> >>bug.
> >
> >I'm fairly sure it is the exact same bug. Jumping backward is like jumping 
> >forward by a biiiiig amount :)
> Hi,
> I've tested your path on my test VM... don't know if it's pure luck
> or not, but it didn't hang with over 70 restores.
> The message "KVM Clock migrated backwards, using later time" fires
> every time, but VM is healthy after resume.

What is the host clocksource? (cat

And kernel version?

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