Re: [Xen-devel] [PATCH] libxc: refactor memory allocation functions

[Ian Campbell <ian.campbell@xxxxxxxxxx>]

On Tue, 2015-12-01 at 12:03 +0000, Wei Liu wrote:
>Â
> > > We don't have INVALID_PFN, maybe we need one?
> > 
> > We have INVALID_MFN and INVALID_P2M_ENTRY, not sure if the latter fits the
> > bill (or if not how it is distinct from the former).
> > 
> 
> Yeah, I'm aware of those but they don't seem to fit because they are
> used in MFN space.

Right, I wasn't sure about the latter, since given a P2M_ENTRY is an MFN I
then don't see how/why it is distinct from INVALID_MFN. Perhaps I'm missing
something (guest p2m width perhaps?), or maybe it's just historical
baggage.

Ian.

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