[Xen-devel] [RFC PATCH V3 18/22] Implement EVTCHNOP_register_extended

[Wei Liu <wei.liu2@xxxxxxxxxx>]

Note: this call always fails as it is not yet completed.

Signed-off-by: Wei Liu <wei.liu2@xxxxxxxxxx>
---
 xen/common/event_channel.c |   56 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 56 insertions(+)

diff --git a/xen/common/event_channel.c b/xen/common/event_channel.c
index 26daa7e..bb6e5f9 100644
--- a/xen/common/event_channel.c
+++ b/xen/common/event_channel.c
@@ -1204,6 +1204,34 @@ static long 
evtchn_register_3level(evtchn_register_3level_t *arg)
     return rc;
 }
 
+/*
+ * NOTE to extneded event channel users:
+ * extended channels are likely to consume lots large global mapping
+ * area in Xen. For example, 3-level event channel consumes 16 +
+ * nr_vcpus pages global mapping area.
+ */
+static long evtchn_register_extended(struct evtchn_register_extended *reg)
+{
+    struct domain *d = current->domain;
+    int rc;
+
+    spin_lock(&d->event_lock);
+
+    switch ( reg->cmd )
+    {
+    case EVTCHN_EXTENDED_NONE:
+    default:
+        rc = -EINVAL;
+    case EVTCHN_EXTENDED_L3:
+        rc = evtchn_register_3level(&reg->u.l3);
+        break;
+    }
+
+    spin_unlock(&d->event_lock);
+
+    return rc;
+}
+
 long do_event_channel_op(int cmd, XEN_GUEST_HANDLE_PARAM(void) arg)
 {
     long rc;
@@ -1312,6 +1340,19 @@ long do_event_channel_op(int cmd, 
XEN_GUEST_HANDLE_PARAM(void) arg)
         break;
     }
 
+    case EVTCHNOP_register_extended: {
+        struct evtchn_register_extended reg;
+
+        if ( copy_from_guest(&reg, arg, 1) != 0 )
+            return -EFAULT;
+        rc = evtchn_register_extended(&reg);
+
+        /* XXX always fails this call because it is not yet completed */
+        rc = -EINVAL;
+
+        break;
+    }
+
     default:
         rc = -ENOSYS;
         break;
@@ -1438,6 +1479,19 @@ int evtchn_init(struct domain *d)
     return 0;
 }
 
+static void evtchn_unmap_extended(struct domain *d)
+{
+    switch ( d->evtchn_extended )
+    {
+    case EVTCHN_EXTENDED_NONE:
+    default:
+        break;
+    case EVTCHN_EXTENDED_L3:
+        __evtchn_unmap_all_3level(d);
+        break;
+    }
+}
+
 
 void evtchn_destroy(struct domain *d)
 {
@@ -1466,6 +1520,8 @@ void evtchn_destroy(struct domain *d)
 
     clear_global_virq_handlers(d);
 
+    evtchn_unmap_extended(d);
+
     free_xenheap_page(d->evtchn);
 }
 
-- 
1.7.10.4


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