arch/x86: Add missing mem_sharing XSM hooks

This patch adds splits up the mem_sharing and mem_event XSM hooks to
better cover what the code is doing. It also changes the utility
function get_mem_event_op_target to rcu_lock_live_remote_domain_by_id
because there is no mm-specific logic in there.

Signed-off-by: Daniel De Graaf <dgdegra@tycho.nsa.gov>
Acked-by: Tim Deegan <tim@xen.org>
Acked-by: Jan Beulich <jbeulich@suse.com>
Committed-by: Keir Fraser <keir@xen.org>

1 files changed, 15 insertions, 0 deletions

diff --git a/xen/common/domain.c b/xen/common/domain.c
index 2f8ef0070f..ec8efe8a41 100644
--- a/xen/common/domain.c
+++ b/xen/common/domain.c
@@ -475,6 +475,21 @@ int rcu_lock_remote_domain_by_id(domid_t dom, struct domain **d)
     return 0;
 }
 
+int rcu_lock_live_remote_domain_by_id(domid_t dom, struct domain **d)
+{
+    int rv;
+    rv = rcu_lock_remote_domain_by_id(dom, d);
+    if ( rv )
+        return rv;
+    if ( (*d)->is_dying )
+    {
+        rcu_unlock_domain(*d);
+        return -EINVAL;
+    }
+
+    return 0;
+}
+
 int domain_kill(struct domain *d)
 {
     int rc = 0;