Re: [Xen-devel] Re: Next steps with pv_ops for Xen

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 5/12/07 20:15, "Jeremy Fitzhardinge" <jeremy@xxxxxxxx> wrote:

> In 2.6.18-xen the only two implementations of zap_pte are
> blktap_clear_pte and gntdev_clear_pte.  Given a ptep with the
> grant-mapping bit set, could we determine which of these need calling
> and do the appropriate thing?  Do we even need separate implementations
> of the core pte-clearing functionality?  Could we just say something like:
> 
> if (pte & _PAGE_XEN_FOREIGN)
> HYPERVISOR_grant_table_op(GNTTABOP_unmap_grant_ref, ...);
> else
> xen_set_pte_at(...);

You'd need to track pte->grant_handle mappings somewhere, but it could
certainly be done this way, yes.

 -- Keir



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