[PATCH 4/8] xen/evtchn: modify evtchn_bind_interdomain to pass domain as argument

[Rahul Singh <rahul.singh@xxxxxxx>]

evtchn_bind_interdomain() finds the local domain from "current->domain"
pointer.

evtchn_bind_interdomain() will be called from the XEN to support static
event channel during domain creation. "current" pointer is not valid at
that time, therefore modify the evtchn_bind_interdomain() to pass
domain as an argument.

Signed-off-by: Rahul Singh <rahul.singh@xxxxxxx>
---
 xen/common/event_channel.c | 6 +++---
 xen/include/xen/event.h    | 1 +
 2 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/xen/common/event_channel.c b/xen/common/event_channel.c
index bf5dc2c8ad..84f0055a5a 100644
--- a/xen/common/event_channel.c
+++ b/xen/common/event_channel.c
@@ -367,11 +367,11 @@ static void double_evtchn_unlock(struct evtchn *lchn, 
struct evtchn *rchn)
  * If lport is zero get the next free port and allocate. If port is non-zero
  * allocate the specified lport.
  */
-int evtchn_bind_interdomain(evtchn_bind_interdomain_t *bind,
+int evtchn_bind_interdomain(evtchn_bind_interdomain_t *bind, struct domain *ld,
                             evtchn_port_t lport)
 {
     struct evtchn *lchn, *rchn;
-    struct domain *ld = current->domain, *rd;
+    struct domain *rd;
     int            rc;
     evtchn_port_t  rport = bind->remote_port;
     domid_t        rdom = bind->remote_dom;
@@ -1248,7 +1248,7 @@ long cf_check do_event_channel_op(int cmd, 
XEN_GUEST_HANDLE_PARAM(void) arg)
         struct evtchn_bind_interdomain bind_interdomain;
         if ( copy_from_guest(&bind_interdomain, arg, 1) != 0 )
             return -EFAULT;
-        rc = evtchn_bind_interdomain(&bind_interdomain, 0);
+        rc = evtchn_bind_interdomain(&bind_interdomain, current->domain, 0);
         if ( !rc && __copy_to_guest(arg, &bind_interdomain, 1) )
             rc = -EFAULT; /* Cleaning up here would be a mess! */
         break;
diff --git a/xen/include/xen/event.h b/xen/include/xen/event.h
index 6e26879793..8eae9984a9 100644
--- a/xen/include/xen/event.h
+++ b/xen/include/xen/event.h
@@ -77,6 +77,7 @@ int __must_check evtchn_alloc_unbound(evtchn_alloc_unbound_t 
*alloc,
 
 /* Bind an event channel port to interdomain */
 int __must_check evtchn_bind_interdomain(evtchn_bind_interdomain_t *bind,
+                                         struct domain *ld,
                                          evtchn_port_t port);
 
 /* Unmask a local event-channel port. */
-- 
2.25.1