RE: [Xen-devel] [RFC] save image file format CHANGE (minor, but feedback appreciated)

[Dan Magenheimer <dan.magenheimer@xxxxxxxxxx>]

Well for PV guests, the p2m table is definitely assumed
to be first.  Are you saying, I can/should put the tmem
stuff between the p2m table and the mapped data pages?
If so, cool, I will give that a try.   Thanks!

Dan

> -----Original Message-----
> From: Keir Fraser [mailto:keir.fraser@xxxxxxxxxxxxx]
> Sent: Thursday, July 30, 2009 4:42 PM
> To: Dan Magenheimer; Xen-Devel (E-mail)
> Cc: Tim Deegan; Gianluca Guida; Stefano Stabellini; John Levon;
> Stefano@xxxxxxxxxxxxxxxxxxxx
> Subject: Re: [Xen-devel] [RFC] save image file format CHANGE 
> (minor, but
> feedback appreciated)
> 
> 
> On 30/07/2009 23:05, "Dan Magenheimer" 
> <dan.magenheimer@xxxxxxxxxx> wrote:
> 
> > It appears that the "next negative number as marker"
> > mechanism only works for data that trails the last
> > iteration of (mapped) pages, and thus works only after
> > the domain has been suspended.  (True?)
> 
> No. It so happens that all such markers are emitted after 
> saved pages right
> now, but you can see in xc_domain_restore.c that markers are 
> detected right
> at the top of the read pages loop. You could add a new marker, emit it
> before any pages in xc_domain_save.c, and pick it up just fine in the
> restore loop. You'd read the rest of your stuff and act on 
> it, then do a C
> 'continue' to kick off the next loop iteration, which would 
> presumably start
> reading ordinary saved memory pages.
> 
> Your patch is definitely not required.
> 
>  -- Keir
> 
> 
> 
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