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RE: [Xen-devel] Error restoring DomU when using GPLPV

To: "Keir Fraser" <keir.fraser@xxxxxxxxxxxxx>, "ANNIE LI" <annie.li@xxxxxxxxxx>
Subject: RE: [Xen-devel] Error restoring DomU when using GPLPV
From: "James Harper" <james.harper@xxxxxxxxxxxxxxxx>
Date: Thu, 20 Aug 2009 19:42:31 +1000
Cc: Joshua West <jwest@xxxxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxx
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Thread-topic: [Xen-devel] Error restoring DomU when using GPLPV
> On 20/08/2009 09:17, "ANNIE LI" <annie.li@xxxxxxxxxx> wrote:
> >> Like I said before -- unmapping the gnttab pages I think will not
help you
> >> for live migration, but I suppose it is a reasonable thing to do
> For
> >> live migration I think xc_domain_save needs t get a bit smarter
> >> Xenheap pages in HVM guests.
> > Yes. The live migration of windows domu with pv driver failed again
> > after we added unmapping gnttab and shinfo pages in suspending
> > The save process is OK, but the restore hit the similar problem. So
> > should we do in windows pv driver to avoid this problem? Any
> > for this issue?
> Balloon down by (#gnttab+#shinfo) pages when PV drivers first load.
> could do this instead of unmapping gnttab+shinfo pages on suspend, or
> well as.
> Ultimately the 'right' fix will need to be implemented in Xen and dom0
> tools. But the above kludge would work perfectly well I believe.

Kludgy, as you say, but if it works then so be it.

Is there a future proof way for the drivers to know if they are running
under a future version of xen that isn't broken in this way? I'm
guessing not...


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