Re: [Xen-users] can xen save a 32 bits domU from a 64 bits dom0?

[Mark Williamson <mark.williamson@xxxxxxxxxxxx>]

> I'm testing many xen versions (3.0, 3.1 and 3.2) with 32 and 64 bits
> linux kernel: I read that from the 3.1, xen is able to manage from a
> 64 bit dom0 both 32bits or 64bits domU.
>
> With xen 3.2 and 3.1, when I save or migrate a 32 bit domU on 64 bit
> dom0  the operation fails and I get this error:
>
> Error: /usr/lib64/xen/bin/xc_save 4 2 0 0 0 failed
>
>
> So, I suppose xen is NOT supporting both 32 and 64 bits domU from a 64
> dom0.
>
> Could you confirm it, please?

Xen 3.1 added support for running both 32-bit and 64-bit domUs on a 64-bit 
Xen.  However, save/restore and migration were not supported /when the domU 
had a different mode to dom0/.  So you could run a 64-bit Xen with 32-bit 
dom0 and be able to save/restore/migrate 32-bit domUs only.  Or you could run 
a 64-bit Xen with 64-bit dom0 and be able to save/restore/migrate 64-bit 
domUs only.

For functionality other than save/restore/migrate, all domains should 
generally behave the same.

The reason for this restriction is that some more restructuring is required in 
the dom0 toolset to allow it to manipulate domains running in different mode 
to dom0 itself.

I've not checked the situation for Xen 3.2 but your experience suggests that 
the restriction has still not been lifted.  If not, it should be fixed in a 
future release.  I'm afraid I don't know more specifically than that, 
though :-(

Cheers,
Mark

-- 
Push Me Pull You - Distributed SCM tool (http://www.cl.cam.ac.uk/~maw48/pmpu/)

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