xen/grant-table: pre-populate kernel unmap ops for xen_gnttab_unmap_refs()
When unmapping grants, instead of converting the kernel map ops to unmap ops on the fly, pre-populate the set of unmap ops. This allows the grant unmap for the kernel mappings to be trivially batched in the future. Signed-off-by: NDavid Vrabel <david.vrabel@citrix.com> Reviewed-by: NStefano Stabellini <stefano.stabellini@eu.citrix.com>
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