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Commit 416efba0 authored by Stefano Stabellini's avatar Stefano Stabellini Committed by Boris Ostrovsky
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xen/pvcalls: introduce the pvcalls xenbus frontend 

Introduce a xenbus frontend for the pvcalls protocol, as defined by
https://xenbits.xen.org/docs/unstable/misc/pvcalls.html

.

This patch only adds the stubs, the code will be added by the following
patches.

Signed-off-by: default avatarStefano Stabellini <stefano@aporeto.com>
Reviewed-by: default avatarBoris Ostrovsky <boris.ostrovsky@oracle.com>
CC: boris.ostrovsky@oracle.com
CC: jgross@suse.com
Signed-off-by: default avatarBoris Ostrovsky <boris.ostrovsky@oracle.com>
parent 0b07194b

drivers/xen/pvcalls-front.c

0 → 100644
+61 −0
Original line number Original line Diff line number Diff line 
/*

 * (c) 2017 Stefano Stabellini <stefano@aporeto.com>

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; either version 2 of the License, or

 * (at your option) any later version.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 */



#include <linux/module.h>



#include <xen/events.h>

#include <xen/grant_table.h>

#include <xen/xen.h>

#include <xen/xenbus.h>

#include <xen/interface/io/pvcalls.h>



static const struct xenbus_device_id pvcalls_front_ids[] = {

	{ "pvcalls" },

	{ "" }

};



static int pvcalls_front_remove(struct xenbus_device *dev)

{

	return 0;

}



static int pvcalls_front_probe(struct xenbus_device *dev,

			  const struct xenbus_device_id *id)

{

	return 0;

}



static void pvcalls_front_changed(struct xenbus_device *dev,

			    enum xenbus_state backend_state)

{

}



static struct xenbus_driver pvcalls_front_driver = {

	.ids = pvcalls_front_ids,

	.probe = pvcalls_front_probe,

	.remove = pvcalls_front_remove,

	.otherend_changed = pvcalls_front_changed,

};



static int __init pvcalls_frontend_init(void)

{

	if (!xen_domain())

		return -ENODEV;



	pr_info("Initialising Xen pvcalls frontend driver\n");



	return xenbus_register_frontend(&pvcalls_front_driver);

}



module_init(pvcalls_frontend_init);