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    SubjectRE: [Xen-devel] Regressions in v3.3-rc1 introduced by "xen/granttable: Grant tables V2 implementation"
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    On Wed, 2012-01-25 at 15:16 +0000, Paul Durrant wrote:
    > > -----Original Message-----
    > >
    > > On HVM for gnttab_shared we make an add_to_physmap call with
    > > XENMAPSPACE_grant_table (in gnttab_map). I don't see any support call to
    > > do something similar for the status array though and I don't see a
    > > XENMAPSPACE_* specifically for that case either in the hypervisor either.
    > >
    >
    > There is no map-space for the status pages. To map them you use the
    > standard map space but OR a bit (top bit IIRC) into in the idx. It's a
    > bit icky, but that's how it is.

    I can't see that happening anywhere in the current Linux tree, there's
    only one call to XENMAPSPACE_grant_table and it doesn't set the top bit,
    so presumably this is at least part of the problem.

    I hope that "top bit" is consistent for 32 and 64 bit domains....

    Ian.



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