[Xen-changelog] [xen-3.1-testing] Fix save/restore failure cleanup

["Xen patchbot-3.1-testing" <patchbot-3.1-testing@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User Keir Fraser <keir.fraser@xxxxxxxxxx>
# Date 1202134937 0
# Node ID d537f1a3ed775e9ed4c17147123b41ede5760a0b
# Parent  4616674ead56a8df30f1b8c59f56d2dc3fb6d70c
Fix save/restore failure cleanup

The save failure cleanup introduced in 13543:207523704fb1 is
incorrect: if we didn't get as far as actually suspending the domain,
then the guest domain will not be expecting the devices to be removed
(seen on both Linux and Solaris, which don't expect a 'Closing' state
when they hold the device open). Only re-jig devices if we definitely
shut the domain down.

Signed-off-by: John Levon <john.levon@xxxxxxx>
xen-unstable changeset:   16964:5d84464dc1fc013110c25dc0ff1f99585e699fa3
xen-unstable date:        Sat Feb 02 10:51:54 2008 +0000
---
 tools/python/xen/xend/XendCheckpoint.py |   12 ++++++++++--
 1 files changed, 10 insertions(+), 2 deletions(-)

diff -r 4616674ead56 -r d537f1a3ed77 tools/python/xen/xend/XendCheckpoint.py
--- a/tools/python/xen/xend/XendCheckpoint.py   Mon Feb 04 14:20:07 2008 +0000
+++ b/tools/python/xen/xend/XendCheckpoint.py   Mon Feb 04 14:22:17 2008 +0000
@@ -66,6 +66,8 @@ def save(fd, dominfo, network, live, dst
     # thing is useful for debugging.
     dominfo.setName('migrating-' + domain_name)
 
+    done_suspend = 0
+
     try:
         dominfo.migrateDevices(network, dst, DEV_MIGRATE_STEP1, domain_name)
 
@@ -93,6 +95,7 @@ def save(fd, dominfo, network, live, dst
                 log.debug("Suspending %d ...", dominfo.getDomid())
                 dominfo.shutdown('suspend')
                 dominfo.waitForShutdown()
+                done_suspend = 1
                 dominfo.migrateDevices(network, dst, DEV_MIGRATE_STEP2,
                                        domain_name)
                 log.info("Domain %d suspended.", dominfo.getDomid())
@@ -139,8 +142,13 @@ def save(fd, dominfo, network, live, dst
         log.exception("Save failed on domain %s (%s).", domain_name,
                       dominfo.getDomid())
 
-        dominfo.resumeDomain()
-        log.debug("XendCheckpoint.save: resumeDomain")
+        # If we didn't get as far as suspending the domain (for
+        # example, we couldn't balloon enough memory for the new
+        # domain), then we don't want to re-plumb the devices, as the
+        # domU will not be expecting it.
+        if done_suspend:
+            log.debug("XendCheckpoint.save: resumeDomain")
+            dominfo.resumeDomain()
 
         try:
             dominfo.setName(domain_name)

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