[Xen-users] HVM Live Migration Troubles - Xen 3.3.1

[Jonathan Dye <jdye@xxxxxxxxxxxxxxxxxxxx>]

I'm having issues with HVM live migration and every xen version I've 
tried - 3.0.1, 3.1.x, 3.3.0 and 3.3.1.  Migrations will fail 
intermittently with messages like this on the receiving hypervisor:
[2009-02-02 11:35:19 12629] DEBUG (XendCheckpoint:264) [xc_restore]: 
/usr/lib64/xen/bin/xc_restore 4 4 2 3 1 1 1
[2009-02-02 11:35:19 12629] INFO (XendCheckpoint:403) xc_domain_restore 
start: p2m_size = 100000
[2009-02-02 11:35:19 12629] INFO (XendCheckpoint:403) Reloading memory 
pages:   0%
[2009-02-02 11:35:23 12629] INFO (XendCheckpoint:403) Received all pages 
(0 races)
[2009-02-02 11:35:23 12629] INFO (XendCheckpoint:403) ERROR Internal 
error: error setting the HVM context
[2009-02-02 11:35:23 12629] INFO (XendCheckpoint:403) Restore exit with rc=1
[2009-02-02 11:35:23 12629] DEBUG (XendDomainInfo:2402) 
XendDomainInfo.destroy: domid=4
[2009-02-02 11:35:23 12629] ERROR (XendDomainInfo:2416) 
XendDomainInfo.destroy: domain destruction failed.
Traceback (most recent call last):
 File "/usr/lib64/python2.4/site-packages/xen/xend/XendDomainInfo.py", 
line 2409, in destroy
   xc.domain_pause(self.domid)
Error: (3, 'No such process')
*xend appears to tear down the failed target vm*
[2009-02-02 11:35:23 12629] ERROR (XendDomain:1145) Restore failed
Traceback (most recent call last):
 File "/usr/lib64/python2.4/site-packages/xen/xend/XendDomain.py", line 
1143, in domain_restore_fd
   return XendCheckpoint.restore(self, fd, paused=paused, 
relocating=relocating)
 File "/usr/lib64/python2.4/site-packages/xen/xend/XendCheckpoint.py", 
line 268, in restore
   forkHelper(cmd, fd, handler.handler, True)
 File "/usr/lib64/python2.4/site-packages/xen/xend/XendCheckpoint.py", 
line 391, in forkHelper
   raise XendError("%s failed" % string.join(cmd))
XendError: /usr/lib64/xen/bin/xc_restore 4 4 2 3 1 1 1 failed

and on the sending hypervisor:

[2009-02-02 11:57:32 11768] ERROR (XendCheckpoint:157) Save failed on 
domain xen20 (13) - r
esuming.
Traceback (most recent call last):
 File "/usr/lib64/python2.4/site-packages/xen/xend/XendCheckpoint.py", 
line 135, in save
   write_exact(fd, buf, "could not write device model state")
 File "/usr/lib64/python2.4/site-packages/xen/xend/XendCheckpoint.py", 
line 44, in write_e
xact
   raise XendError(errmsg)
XendError: could not write device model state

what do "could not write device model state" and  "error setting the HVM 
context" indicate?
- jonathan

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