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 <stef...@aporeto.com>
CC: boris.ostrov...@oracle.com
CC: jgr...@suse.com
---
drivers/xen/pvcalls-front.c | 68 +++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 68 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..173e204
--- /dev/null
+++ b/drivers/xen/pvcalls-front.c
@@ -0,0 +1,68 @@
+/*
+ * (c) 2017 Stefano Stabellini <stef...@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 int pvcalls_front_resume(struct xenbus_device *dev)
+{
+ dev_warn(&dev->dev, "suspsend/resume unsupported\n");
+ 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,
+ .resume = pvcalls_front_resume,
+ .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
_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xen.org
https://lists.xen.org/xen-devel
