In preparation for supporting already-introduced domain, only call
xs_introduce_domain() if a domain is not already introduced.  Their
xenstore entries will be written, but the xenstore introduction is
skipped.

Signed-off-by: Jason Andryuk <jason.andryuk@amd.com>
---
v3:
Reordered
---
 tools/helpers/init-dom0less.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/tools/helpers/init-dom0less.c b/tools/helpers/init-dom0less.c
index 8de8e44ad3..3906c4b61a 100644
--- a/tools/helpers/init-dom0less.c
+++ b/tools/helpers/init-dom0less.c
@@ -319,9 +319,13 @@ static int init_domain(libxl_dominfo *info)
     if (rc)
         err(1, "writing to xenstore");
 
-    rc = xs_introduce_domain(xsh, info->domid, xenstore_pfn, xenstore_evtchn);
-    if (!rc)
-        err(1, "xs_introduce_domain");
+    if (!xs_is_domain_introduced(xsh, info->domid)) {
+        rc = xs_introduce_domain(xsh, info->domid, xenstore_pfn,
+                                 xenstore_evtchn);
+        if (!rc)
+            err(1, "xs_introduce_domain");
+    }
+
     return 0;
 }
 
-- 
2.50.1