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RE: [Xen-devel] treatment grant frames during save/restore

To: Jan Beulich <JBeulich@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxx
Subject: RE: [Xen-devel] treatment grant frames during save/restore
From: Dan Magenheimer <dan.magenheimer@xxxxxxxxxx>
Date: Thu, 27 May 2010 08:50:01 -0700 (PDT)
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> -----Original Message-----
> From: Jan Beulich [mailto:JBeulich@xxxxxxxxxx]
> Sent: Thursday, May 27, 2010 9:38 AM
> To: xen-devel@xxxxxxxxxxxxxxxxxxx
> Subject: Re: [Xen-devel] treatment grant frames during save/restore
> >>> On 27.05.10 at 17:27, "Jan Beulich" <JBeulich@xxxxxxxxxx> wrote:
> > From what I can tell, grant frames get no special treatment by the
> tools
> > during save, and hence get treated as normal memory during restore.
> > If that's correct, it would seem that there's an accounting issue,
> since
> > during restore a normal RAM page will be allocated by the tools for
> each
> > grant frame, hence a domain that prior to save was below its limit
> > could now end up crossing that limit, and thus unexpectedly fail to
> > restore. If that's not a possibility, what am I missing?
> Ooops, just noticed that I didn't say explicitly that this is for HVM
> guests.

There was some discussion about this last September.  Here's one link:


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