Xen devel - Apr 2007 - Is live migrate a guest from 32bit platform to 64bit platform a supported feature?

Hi,

I tried to live migrate a 32bit guest from 32bit platform to 64bit
platform, but met failure, so I''d like to consult that is this a
supported feature?

Xend.log shows:

[2007-04-27 14:45:30 10353] DEBUG (XendCheckpoint:88) [xc_save]:
/usr/lib/xen/bin/xc_save 25 5 0 0 5

[2007-04-27 14:45:31 8565] DEBUG (XendDomainInfo:825) Storing domain
details: {''console/port'': ''4'',
''name'': ''migrating-ExampleHVMDomain'',
''console/limit'': ''1048576'',
''vm'':
''/vm/535353a2-9a02-c2dc-f352-d8b5b4f02c7d'',
''domid'': ''5'',
''image/suspend-cancel'': ''1'',
''cpu/0/availability'': ''online'',
''memory/target'': ''524288'',
''control/platform-feature-multiprocessor-suspend'':
''1'',
''store/ring-ref'': ''131070'',
''cpu/1/availability'': ''online'',
''store/port'': ''3''}

[2007-04-27 14:45:31 10356] INFO (XendCheckpoint:329) Saving memory
pages: iter 1   0%ERROR Internal error: Error when writing to state file
(5) (errno 2)

[2007-04-27 14:45:31 10356] INFO (XendCheckpoint:329) Save exit rc=1

[2007-04-27 14:45:31 10353] ERROR (XendCheckpoint:140) Save failed on
domain ExampleHVMDomain (5).

Traceback (most recent call last):

  File "/usr/lib/python/xen/xend/XendCheckpoint.py", line 109, in save

    forkHelper(cmd, fd, saveInputHandler, False)

  File "/usr/lib/python/xen/xend/XendCheckpoint.py", line 317, in
forkHelper

    raise XendError("%s failed" % string.join(cmd))

XendError: /usr/lib/xen/bin/xc_save 25 5 0 0 5 failed

[2007-04-27 14:45:31 10353] DEBUG (XendDomainInfo:1691)
XendDomainInfo.resumeDomain(5)

[2007-04-27 14:45:31 10353] DEBUG (XendCheckpoint:143)
XendCheckpoint.save: resumeDomain

[2007-04-27 14:45:31 8565] DEBUG (XendDomainInfo:825) Storing domain
details: {''console/port'': ''4'',
''name'': ''ExampleHVMDomain'',
''console/limit'': ''1048576'',
''vm'':
''/vm/535353a2-9a02-c2dc-f352-d8b5b4f02c7d'',
''domid'': ''5'',
''image/suspend-cancel'': ''1'',
''cpu/0/availability'': ''online'',
''memory/target'': ''524288'',
''control/platform-feature-multiprocessor-suspend'':
''1'',
''store/ring-ref'': ''131070'',
''cpu/1/availability'': ''online'',
''store/port'': ''3''}

 

Best regards,

Fan

 



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On 27/4/07 06:59, "Zhao, Fan" <fan.zhao@intel.com> wrote:
> Hi,
> I tried to live migrate a 32bit guest from 32bit platform to 64bit
platform,
> but met failure, so I¹d like to consult that is this a supported feature?
No, you cannot save/restore/migrate between 32-bit dom0 and 64-bit dom0
currently.

 -- Keir



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> I tried to live migrate a 32bit guest from 32bit platform to 64bit
> platform, but met failure, so I''d like to consult that is this a
> supported feature?
No, this is not (yet) supported. For the time beeing the kernel must
use the same bitsize as the hypervisor. So you need a 64bit kernel when
using a 64bit hypervisor. The migrated 32bit kernel still is 32bit.

The upcomming 3.0.5 is supposed to support 32bit kernel (pae only) on
64bit. So it might be possible to migrate a 32bit-pae domu to a 64bit
hypervisor.
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