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

[Joshua West <jwest@xxxxxxxxxxxx>]

Dang, doesn't work in Xen 3.1.3-rc1 (like you said/expected), with or 
without Kurt's patches.
Hmm... I thought 32-bit paravirtualized domU's on 64-bit dom0's were 
supported in Xen 3.1.x?  Or am I mistaken?
Perhaps standard features such as start/shutdown/pause of 32-bit PV 
domU's on 64-bit dom0's are supported, but not the more advanced 
management features like save and migrate - and I was just unclear from 
the beginning?
And of course... the final question that all developers hate... when 
s/could one _hope_ (not expect!) to see save/migrate functionality of 
32-bit PV domU's on 64-bit dom0's? :-D
Our whole reason for moving to 64-bit dom0's was to utilize 32GB of 
memory, instead of the 16GB limitation on 32-bit PAE dom0's.  We can't 
convert all of our virtual machines (100+) to 64-bit linux as its too 
much work and some actually have to be 32-bit due to vendor supplied 
software (Oracle, Zimbra, etc).  I suppose we'll wait to move to 64-bit 
until [live] migration is available, as its used quite frequently in our 
machine rooms.
Thanks for all of your help Keir and Kurt.

Keir Fraser wrote:
> Looking at the issues that need to be handled to support this, it cannot be
> expected to work.
>
>  -- Keir
>
> On 18/1/08 22:13, "Joshua West" <jwest@xxxxxxxxxxxx> wrote:
>
>   
> > Ahh.  Well, I'm building xen-3.1.3-rc1 right now and I'll see how that goes.
> >
> > Keir, have you seen this issue before?  Where one cannot xm save/migrate
> > a 32-bit domU on a 64-bit dom0?  Or is this expected to work and just
> > doesn't go well for me?
> >
> > Keir Fraser wrote:
> >     
> > > On 18/1/08 22:05, "Joshua West" <jwest@xxxxxxxxxxxx> wrote:
> > >
> > >   
> > >       
> > > > 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?
> > > >     
> > > >         
> > > The extent of the patches that Kurt posted indicate its pretty unlikely to
> > > work without considerable code modification. I guess those patches aren't
> > > quite fully baked yet, unfortunately, or haven't been written with your
> > > precise case in mind.
> > >
> > >  -- Keir
> > >
> > >
> > >   
> > >       
>
>   

--
Joshua West
Systems Engineer
Brandeis University
http://www.brandeis.edu


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