[XEN] New event-channel reset operation.

Plumbed through libxenctrl to python.

From: Andrei Petrov <andrei.petrov@xensource.com>
Signed-off-by: Keir Fraser <keir@xensource.com>

1 files changed, 31 insertions, 0 deletions

diff --git a/xen/common/event_channel.c b/xen/common/event_channel.c
index 70665a7e78..0116a9aa91 100644
--- a/xen/common/event_channel.c
+++ b/xen/common/event_channel.c
@@ -735,6 +735,29 @@ static long evtchn_unmask(evtchn_unmask_t *unmask)
 }
 
 
+static long evtchn_reset(evtchn_reset_t *r)
+{
+    domid_t dom = r->dom;
+    struct domain *d;
+    int i;
+
+    if ( dom == DOMID_SELF )
+        dom = current->domain->domain_id;
+    else if ( !IS_PRIV(current->domain) )
+        return -EPERM;
+
+    if ( (d = find_domain_by_id(dom)) == NULL )
+        return -ESRCH;
+
+    for ( i = 0; port_is_valid(d, i); i++ )
+        (void)__evtchn_close(d, i);
+
+    put_domain(d);
+
+    return 0;
+}
+
+
 long do_event_channel_op(int cmd, XEN_GUEST_HANDLE(void) arg)
 {
     long rc;
@@ -833,6 +856,14 @@ long do_event_channel_op(int cmd, XEN_GUEST_HANDLE(void) arg)
         break;
     }
 
+    case EVTCHNOP_reset: {
+        struct evtchn_reset reset;
+        if ( copy_from_guest(&reset, arg, 1) != 0 )
+            return -EFAULT;
+        rc = evtchn_reset(&reset);
+        break;
+    }
+
     default:
         rc = -ENOSYS;
         break;