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

[Joshua West <jwest@xxxxxxxxxxxx>]

Hi Kurt,

Awesome -- thanks for the patches!  I'll be testing them later on today 
and I'll let you know what happens.
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
>
>
> On Thu, Jan 17, 2008 at 09:21:41PM -0500, Joshua West wrote:
>   
> > Hey all,
> >
> > So it looks like the xc_save utility has issues saving a 32-bit 
> > paravirtualized domU on a 64-bit dom0.  As a result, live migration of 
> > 32-bit PV VM's (between 64-bit dom0's) also does not work.  However, I am 
> > able to "xm save" and "xm migrate" 64-bit PV domU's on those same 64-bit 
> > dom0's without encountering issues.
> > Has anybody else run into save/migrate issues of 32-bit domU's on 64-bit 
> > dom0's?  Do you know of a fix or workaround?
> > The 32-bit domU's I'm working with have kernels which are compiled with PAE 
> > (HIGHMEM64G=y) support.  Additionally, both of these machines are of 
> > identical hardware configuration (Dell PowerEdge 1950's) and have been 
> > setup exactly the same.
> > Here is a snippit of output from /var/log/xen/xend.log:
> >
> > #----------------------------------------------------------#
> > [2008-01-17 19:18:08 8353] DEBUG (XendCheckpoint:88) [xc_save]: 
> > /usr/lib64/xen/bin/xc_save 30 1 0 0 0
> > [2008-01-17 19:18:08 8353] DEBUG (XendCheckpoint:333) suspend
> > [2008-01-17 19:18:08 8353] DEBUG (XendCheckpoint:91) In saveInputHandler 
> > suspend
> > [2008-01-17 19:18:08 8353] DEBUG (XendCheckpoint:93) Suspending 1 ...
> > [2008-01-17 19:18:08 8353] DEBUG (XendDomainInfo:451) 
> > XendDomainInfo.shutdown(suspend)
> > [2008-01-17 19:18:08 8353] DEBUG (XendDomainInfo:991) 
> > XendDomainInfo.handleShutdownWatch
> > [2008-01-17 19:18:08 8353] DEBUG (XendDomainInfo:991) 
> > XendDomainInfo.handleShutdownWatch
> > [2008-01-17 19:18:08 8353] INFO (XendCheckpoint:98) Domain 1 suspended.
> > [2008-01-17 19:18:08 8353] INFO (XendDomainInfo:1179) Domain has shutdown: 
> > name=migrating-rhel5-test id=1 reason=suspend.
> > [2008-01-17 19:18:08 8353] DEBUG (XendCheckpoint:107) Written done
> > [2008-01-17 19:18:09 8353] INFO (XendCheckpoint:362) ERROR Internal error: 
> > Timed out waiting for frame list updated.
> > [2008-01-17 19:18:09 8353] INFO (XendCheckpoint:362) ERROR Internal error: 
> > Failed to map/save the p2m frame list
> > [2008-01-17 19:18:09 8353] INFO (XendCheckpoint:362) Save exit rc=1
> > [2008-01-17 19:18:09 8353] 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 30 1 0 0 0 failed
> > [2008-01-17 19:18:09 8353] DEBUG (XendDomainInfo:1793) 
> > XendDomainInfo.resumeDomain(1)
> > [2008-01-17 19:18:09 8353] DEBUG (XendCheckpoint:143) XendCheckpoint.save: 
> > resumeDomain
> > #----------------------------------------------------------#
> >
> > I'm not sure if this is related, but I also see messages such as the 
> > following in "xm dmesg":
> > (XEN) event_channel.c:231:d3 EVTCHNOP failure: domain 1, error -17, line 
> > 231
> > (XEN) event_channel.c:231:d4 EVTCHNOP failure: domain 4, error -17, line 
> > 231
> > I suspect they're just a result of the save failures.
> >
> > Any help would be *greatly* appreciated!
> >
> > Thanks!
> >
> > --
> > Joshua West
> > Systems Engineer
> > Brandeis University
> > http://www.brandeis.edu
> >
> >
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> > Xen-devel@xxxxxxxxxxxxxxxxxxx
> > http://lists.xensource.com/xen-devel
> >     
>   
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--
Joshua West
Systems Engineer
Brandeis University
http://www.brandeis.edu


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