Hi all,
The Xend has a problem that it often fails to restore/migrate
a PV domain whose device backends are partly a driver domain.
Because a checkpoint of the PV domain has device backend value as
domain id, you can restore/migrate the PV domain only when a driver
domain is the same id as device backend value in the checkpoint.
I attached a patch to fix it by renaming device backend value in a
checkpoint from domain id to domain name when xm save/migrate.
This patch doesn't rename device backend value if the value is 0,
which is Domain-0, so the checkpoint format is compatible if you use
only Domain-0 as device backend.
Signed-off-by: Rikiya Ayukawa <ayukawa.rikiya@xxxxxxxxxxxxxx>
Diffstat:
 XendCheckpoint.py | 14 ++++++++++++++
 1 file changed, 14 insertions(+)
Best Regards,
--
Rikiya Ayukawa

diff -r 68e8b8379244 tools/python/xen/xend/XendCheckpoint.py
--- a/tools/python/xen/xend/XendCheckpoint.py Sun Aug 02 13:43:15 2009 +0100
+++ b/tools/python/xen/xend/XendCheckpoint.py Thu Aug 06 17:02:23 2009 +0900
@@ -66,6 +66,8 @@
 
 
 def save(fd, dominfo, network, live, dst, checkpoint=False, node=-1):
+ from xen.xend import XendDomain
+
 try:
 if not os.path.isdir("/var/lib/xen"):
 os.makedirs("/var/lib/xen")
@@ -80,6 +82,18 @@
 if node > -1:
 insert_after(sxprep,'vcpus',['node', str(node)])
 
+ for device_sxp in sxp.children(sxprep, 'device'):
+ backend = sxp.child(device_sxp[1], 'backend')
+ if backend == None:
+ continue
+ bkdominfo = XendDomain.instance().domain_lookup_nr(backend[1])
+ if bkdominfo == None:
+ raise XendError("Could not find backend: %s" % backend[1])
+ if bkdominfo.getDomid() == XendDomain.DOM0_ID:
+ # Skip for compatibility of checkpoint data format
+ continue
+ backend[1] = bkdominfo.getName()
+ 
 config = sxp.to_string(sxprep)
 
 domain_name = dominfo.getName()

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