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Re: [Xen-devel] Re: [PATCH] Xen Guest Kexec
On Mon, Mar 06, 2006 at 03:15:00PM +0100, Gerd Hoffmann wrote:
> * Which events can change the p2m map? I think for domU that is only
> ballooning, right? For dom0 additionally the backend drivers (when
> mapping foreign pages). Anything else?
Networking as well, since network packet reception involves flipping
pages between domains.
> * Is there some way to rebuild the p2m map from scratch using
As far as I know not completely reliably, since the P2M map is
maintained by the guest and Xen is almost entirely uninvolved.
You could probably get most of the way there by retrieving a list of
pages belonging to the guest (not sure if this can be done from within
an unprivileged guest though, or only in Domain-0), then building a
reverse map of entries in the M2P table. This will only work if all
pages have accurate M2P entries (certainly won't work for domain-0,
since it maps foreign pages, but might work for unprivileged domains).
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