Re: [Xen-devel] pfn to mfn mapping for HVM domains?

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 29/11/06 5:54 am, "Bryan D. Payne" <bryan@xxxxxxxxxxxx> wrote:

> It turns out that the problem I ran into relates to how the value
> "swapper_pg_dir" from the System map is used.  For PV domains, this
> value points to a location in memory that holds the virtual address
> of the base of the kpgd.  For HVM domains, this value points to the
> base of the kpgd.  I'm not sure why the difference exists (I'd
> certainly be interested in learning if someone could explain it), but
> this was the key insight that fixed my problems.

It's the difference between 'pgd_t *' and 'pgd_t []'. PV guests get their
swapper_pgdir from the domain builder rather than having it defined as an
array in their static data section.

 -- Keir



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