Re: Migrate/Save of 32-bit domU Broken on Xen 3.1.2 64-bit dom0

[Joshua West <jwest@brandeis.edu>]

Hi Kurt & Xen Developers,

I applied those two patches to Xen 3.1.3-rc1.  Unfortunately, the issue 
still persists.  xc_save fails and therefore save/migrate doesn't work.  
However, I did receive a different error message this time.  Here's the 
snippit from /var/log/xen/xend.log:

#----------------------------------------------------------#
[2008-01-18 16:57:06 6774] DEBUG (XendCheckpoint:88) [xc_save]: 
/usr/lib64/xen/bin/xc_save 24 1 0 0 0
[2008-01-18 16:57:06 6774] DEBUG (XendCheckpoint:333) suspend
[2008-01-18 16:57:06 6774] DEBUG (XendCheckpoint:91) In saveInputHandler 
suspend
[2008-01-18 16:57:06 6774] DEBUG (XendCheckpoint:93) Suspending 1 ...
[2008-01-18 16:57:06 6774] DEBUG (XendDomainInfo:451) 
XendDomainInfo.shutdown(suspend)
[2008-01-18 16:57:06 6774] DEBUG (XendDomainInfo:991) 
XendDomainInfo.handleShutdownWatch
[2008-01-18 16:57:06 6774] DEBUG (XendDomainInfo:991) 
XendDomainInfo.handleShutdownWatch
[2008-01-18 16:57:06 6774] INFO (XendDomainInfo:1179) Domain has 
shutdown: name=migrating-rhel5-test id=1 reason=suspend.
[2008-01-18 16:57:06 6774] INFO (XendCheckpoint:98) Domain 1 suspended.
[2008-01-18 16:57:06 6774] DEBUG (XendCheckpoint:107) Written done
[2008-01-18 16:57:06 6774] INFO (XendCheckpoint:362) Had 0 unexplained 
entries in p2m table
[2008-01-18 16:57:08 6774] INFO (XendCheckpoint:362) Saving memory 
pages: iter 1  15%ERROR Internal error: Fatal PT race (pfn 853, type 
20000000)
[2008-01-18 16:57:08 6774] INFO (XendCheckpoint:362) Save exit rc=1
[2008-01-18 16:57:08 6774] ERROR (XendCheckpoint:140) Save failed on 
domain rhel5-test (1).
Traceback (most recent call last):
  File "/usr/lib64/python2.4/site-packages/xen/xend/XendCheckpoint.py", 
line 109, in save
    forkHelper(cmd, fd, saveInputHandler, False)
  File "/usr/lib64/python2.4/site-packages/xen/xend/XendCheckpoint.py", 
line 350, in forkHelper
    raise XendError("%s failed" % string.join(cmd))
XendError: /usr/lib64/xen/bin/xc_save 24 1 0 0 0 failed
[2008-01-18 16:57:08 6774] DEBUG (XendDomainInfo:1802) 
XendDomainInfo.resumeDomain(1)
[2008-01-18 16:57:08 6774] DEBUG (XendCheckpoint:143) 
XendCheckpoint.save: resumeDomain
#----------------------------------------------------------#

Just to make sure the patches aren't the cause of this new error 
message, I'm going to see what happens with Xen 3.1.3-rc1 w/o patches.

Kurt, Keir, everybody else... any ideas as to why "xm save" (and thus 
"xm migrate") of 32-bit domU's does not work on 64-bit dom0's?  Has 
anybody found this to be successful in the past?

Thanks.

Kurt Hackel wrote:
> Hi Joshua,
>
> Can you try the two attached patches?  This should apply to 3.1.3-pre.
> These take care of the 32-bit dom0/64-bit domU case, but also should
> have some affect on your 64-bit dom0/32-bit domU.  
>
> Thanks
> kurt
>
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>
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-- 
Joshua West
Systems Engineer
Brandeis University
http://www.brandeis.edu