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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 15:23 +0000, Paul Durrant wrote:
    > > -----Original Message-----
    > > From: Paul Durrant
    > > Sent: 25 January 2012 07:17
    > > To: Ian Campbell; Konrad Rzeszutek Wilk
    > > Cc: annie.li@oracle.com; xen-devel@lists.xensource.com; linux-
    > > kernel@vger.kernel.org
    > > Subject: RE: [Xen-devel] Regressions in v3.3-rc1 introduced by
    > > "xen/granttable: Grant tables V2 implementation"
    > >
    > > > -----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 fixed a bug in xen-unstable a few weeks back that prevented mapping
    > of the status frames so I guess the bug is possibly due to trying to
    > use gnttab 2 on 4.1, where this bug would hit, but failing to check
    > the return code from the status mapping hypercall?

    That bit in the Linux code seems to be correct, at least by inspection.

    Ian.




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