[Xen-devel] Intercepting pf type changes

["Mike Sun" <msun@xxxxxxxxxx>]

Hi all,

The log-dirty mechanism allows me to figure out where in the code
(i.e. paging_mark_dirty()) guest pages are written to.  I'm curious if
there's a clean way for me to intercept or locate when an HVM guest's
pages may have their type changed in Xen, e.g. from a normal page to a
pagetable page or from an invalid page to a normal page.

Also, I was trying to use the xc_get_pfn_type_batch() hypercall to get
the page types for a set of pfns for an HVM domain, but am having
problems.  Is this hypercall only for use with mfns?  I was hoping it
worked the same way xc_map_foreign_batch() does, mfns for PV guests
and pfns for HVM guests.

Thanks,
Mike

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