xen/pvcalls: xenbus state handling
Introduce the code to handle xenbus state changes. Implement the probe function for the pvcalls backend. Write the supported versions, max-page-order and function-calls nodes to xenstore, as required by the protocol. Introduce stub functions for disconnecting/connecting to a frontend. Signed-off-by: NStefano Stabellini <stefano@aporeto.com> Reviewed-by: NBoris Ostrovsky <boris.ostrovsky@oracle.com> Reviewed-by: NJuergen Gross <jgross@suse.com> CC: boris.ostrovsky@oracle.com CC: jgross@suse.com Signed-off-by: NBoris Ostrovsky <boris.ostrovsky@oracle.com>
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