xen_backend: add grant table helpers
This patch adds grant table helper functions to the xen_backend code to localize error reporting and use of xen_domid. The patch also defers the call to xengnttab_open() until just before the initialise method in XenDevOps is invoked. This method is responsible for mapping the shared ring. No prior method requires access to the grant table. Signed-off-by: NPaul Durrant <paul.durrant@citrix.com> Acked-by: NAnthony PERARD <anthony.perard@citrix.com> Signed-off-by: NStefano Stabellini <sstabellini@kernel.org>
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