[RFC PATCH V5 13/14] xen: introduce xen_event_channel_register_extended

[Wei Liu <wei.liu2@citrix.com>]

Signed-off-by: Wei Liu <wei.liu2@citrix.com>
---
 drivers/xen/events.c |   26 ++++++++++++++++++++++++++
 include/xen/events.h |    6 ++++++
 2 files changed, 32 insertions(+)

diff --git a/drivers/xen/events.c b/drivers/xen/events.c
index 6bb9a47..6f21f27 100644
--- a/drivers/xen/events.c
+++ b/drivers/xen/events.c
@@ -2265,6 +2265,32 @@ static int xen_event_channel_register_3level(void)
 	return rc;
 }
 
+int xen_event_channel_register_extended(uint64_t abi)
+{
+	int rc = -EINVAL;
+
+	switch (abi) {
+	case EVTCHN_EXTENDED_L3:
+		rc = xen_event_channel_register_3level();
+		if (rc == 0)
+			printk(KERN_INFO
+			       "Register 3-level event channel succeed.\n");
+		else
+			printk(KERN_INFO
+			       "Register 3-level event channel failed: %d\n",
+			       rc);
+		break;
+	default:
+		printk(KERN_EMERG
+		       "Trying to register unsupported event channel ABI %llx\n",
+		       abi);
+		BUG();
+	}
+
+	return rc;
+}
+
+
 const struct evtchn_ops evtchn_l2_ops = {
 	.unmask = __unmask_local_port_l2,
 	.debug_interrupt = xen_debug_interrupt_l2,
diff --git a/include/xen/events.h b/include/xen/events.h
index 49d54ac..a6a6024 100644
--- a/include/xen/events.h
+++ b/include/xen/events.h
@@ -117,4 +117,10 @@ extern uint64_t xen_evtchn_extended;
 /* Query hypervisor for supported / enabled extended event channel ABIs. */
 uint64_t xen_event_channel_query_extended_abis(void);
 
+/* Set extended event channel to "abi". */
+void xen_set_event_channel_extended(uint64_t abi);
+
+/* Register extended event channel. */
+int xen_event_channel_register_extended(uint64_t abi);
+
 #endif	/* _XEN_EVENTS_H */
-- 
1.7.10.4