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    Subject[PATCH v4 01/13] xen/pvcalls: introduce the pvcalls xenbus frontend
    Date
    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
    ---
    drivers/xen/pvcalls-front.c | 61 +++++++++++++++++++++++++++++++++++++++++++++
    1 file changed, 61 insertions(+)
    create mode 100644 drivers/xen/pvcalls-front.c

    diff --git a/drivers/xen/pvcalls-front.c b/drivers/xen/pvcalls-front.c
    new file mode 100644
    index 0000000..a8d38c2
    --- /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);
    --
    1.9.1
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