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Xen 3.0 Virtualization Interface Guide
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6.1.1 Grant table manipulation

Creating and destroying grant references is done by direct access to the grant table. This removes the need to involve Xen when creating grant references, modifying access permissions, etc. The grantee domain will invoke hypercalls to use the grant references. Four main operations can be accomplished by directly manipulating the table:

Grant foreign access
allocate a new entry in the grant table and fill out the access permissions accordingly. The access permissions will be looked up by Xen when the grantee attempts to use the reference to map the granted frame.
End foreign access
check that the grant reference is not currently in use, then remove the mapping permissions for the frame. This prevents further mappings from taking place but does not allow forced revocations of existing mappings.
Grant foreign transfer
allocate a new entry in the table specifying transfer permissions for the grantee. Xen will look up this entry when the grantee attempts to transfer a frame to the granter.
End foreign transfer
remove permissions to prevent a transfer occurring in future. If the transfer is already committed, modifying the grant table cannot prevent it from completing.

Xen 3.0 Virtualization Interface Guide
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  Published under the terms of the GNU General Public License Design by Interspire