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author | Stefano Stabellini <sstabellini@kernel.org> | 2017-10-30 15:40:51 -0700 |
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committer | Boris Ostrovsky <boris.ostrovsky@oracle.com> | 2017-10-31 09:05:53 -0400 |
commit | 416efba0bd69b2f57da95049d505fff289269c11 (patch) | |
tree | 6e0bff1d7da0b2fc50edec3c9f435784be69af0d | |
parent | 0b07194bb55ed836c2cc7c22e866b87a14681984 (diff) | |
download | linux-stable-416efba0bd69b2f57da95049d505fff289269c11.tar.gz linux-stable-416efba0bd69b2f57da95049d505fff289269c11.tar.bz2 linux-stable-416efba0bd69b2f57da95049d505fff289269c11.zip |
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: Stefano Stabellini <stefano@aporeto.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
CC: boris.ostrovsky@oracle.com
CC: jgross@suse.com
Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
-rw-r--r-- | drivers/xen/pvcalls-front.c | 61 |
1 files changed, 61 insertions, 0 deletions
diff --git a/drivers/xen/pvcalls-front.c b/drivers/xen/pvcalls-front.c new file mode 100644 index 000000000000..a8d38c283014 --- /dev/null +++ b/drivers/xen/pvcalls-front.c @@ -0,0 +1,61 @@ +/* + * (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); |