Re: [Xen-devel] pv 2.6.31 (kernel.org) and save/migrate, domU BUG

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Sun, Nov 08, 2009 at 08:54:23AM -0800, Dan Magenheimer wrote:
> > > Ok, so it appears there is something problematic with
> > > saving an upstream kernel.  It might be (partially) fixed
> > > in Fedora 12 or maybe there is some other environmental
> > > difference which makes save fail entirely on my system.
> > > 
> > 
> > Yeah, fedora kernel has some patches, but it should be pretty 
> > close to upstream kernel..
> > 
> > btw was your guest UP or SMP? Mine was UP..
> 
> Mine was SMP... switching to UP I can now save.  BUT...
> restore doesn't seem to quite work.  The restore completes
> but I get no response from the VNC console.  When I
> use a tty console, after restore, I am getting
> an infinite dump of
> 
> WARNING: at arch/x86/time.c:180 xen_sched_clock+0x2b
> 
> (see attached).
> 
> Did you try restore on Fedora 12?
>  

Yeah. save+restore for UP F12 guest works for me 
(except I get that non-fatal BUG on the guest).

SMP guest doesn't work.. save crashes it.

> > > > > The results explain why I can get it to run on
> > > > > one machine (an older laptop) and not run on another
> > > > > machine (a Nehalem system)... looks like this is maybe
> > > > > related to the cpuid-extended-topology-leaf bug that Jeremy
> > > > > sent a fix for upstream recently.
> > > > 
> > > > Did you try with that patch applied? 
> > > 
> > > No, the patch wasn't posted, just a pull request to Linus,
> > > so I don't have the patch (and am not a git expert so
> > > am not sure how to get it).
> > > 
> > > http://lists.xensource.com/archives/html/xen-devel/2009-11/msg00182.html
> > >
> > > So I'll try it again when .6 or .7 is available.
> > 
> > See here for changelog:
> > http://git.kernel.org/?p=linux/kernel/git/jeremy/xen.git;a=shortlog;h=bugfix
> > 
> > You can get the diffs/patches from there using the links..
> 
> Thanks.  Yes, Jeremy's patch allows 2.6.31.5 (in a PV domain)
> to completely boot on my Nehalem box.

Ok. But I guess those doesn't help for the save+restore problem..

-- Pasi



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