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    SubjectRe: [kvm-devel] [PATCH] export notifier #1
    On Wed, Jan 23, 2008 at 03:12:36PM +0100, Gerd Hoffmann wrote:
    > Hi,
    > >> That would render the notifies useless for Xen too. Xen needs to
    > >> intercept the actual pte clear and instead of just zapping it use the
    > >> hypercall to do the unmap and release the grant.
    > >
    > > We are tackling that by having our own page table hanging off the
    > > structure representing our seg (thing created when we do the equiv of
    > > your grant call).
    > --verbose please. I don't understand that "own page table" trick. Is
    > that page table actually used by the processor or is it just used to
    > maintain some sort of page list?

    We have a seg structure which is similar to some structure you probably
    have which describes the grant. One of the things hanging off that
    seg structure is essentially a page table containing PFNs with their
    respective flags (XPMEM specific and not the same as the pfn flags in
    the processor page tables).


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