[Xen-devel] [PATCH] xend: resume a guest domain after an unsuccessful live migration

["Elena V. Titova" <andia@xxxxxxxxxxxx>]

Hello.

We use debian sarge, linux-image-3.2.0-3-amd64 and xen-4.1.3 on our
servers.
When a live migration is run the guest domain may not resume on a
destination
host and is destroyed on a source host.
This patch fixes it by resuming the guest domain on a source host when a
start of
the guest domain was failed.

git diff tools/python/xen/xend/XendCheckpoint.py
diff --git a/tools/python/xen/xend/XendCheckpoint.py
b/tools/python/xen/xend/XendCheckpoint.py
index fa09757..6b8765f 100644
--- a/tools/python/xen/xend/XendCheckpoint.py
+++ b/tools/python/xen/xend/XendCheckpoint.py
@@ -163,12 +163,16 @@ def save(fd, dominfo, network, live, dst,
checkpoint=False, node=-1,sock=None):
             dominfo.resumeDomain()
         else:
             if live and sock != None:
+                status = os.read(fd, 64) 
                 try:
                     sock.shutdown(2)
                 except:
                     pass
                 sock.close()

+                if status == "FAIL":
+                    raise XendError("Restore failed")
+
             dominfo.destroy()
             dominfo.testDeviceComplete()
         try:
@@ -351,8 +355,14 @@ def restore(xd, fd, dominfo = None, paused = False,
relocating = False):
         if not paused:
             dominfo.unpause()

+        if relocating:
+            os.write(fd, "SUCCESS")
+
         return dominfo
     except Exception, exn:
+        if relocating:
+            os.write(fd, "FAIL")
+
         dominfo.destroy()
         log.exception(exn)
         raise exn 

--
Elena Titova


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