Xen users - Jul 2006 - xm save/restore on a vt enabled machine.

Hello,

I am working with WinXP on xen-unstable and LVM.  I am interested in the
current status of the xm save/restore functionality.  Currently, using
xm save results in a failure.

Using:
# xm save winxp-snap0 winxp-snap0.save

I receive on the console:
Error: /usr/lib/xen/bin/xc_save 10 19 3 0 0 0 failed

Within xend.log the most relevant portion is:
DEBUG (XendCheckpoint:83) [xc_save]: /usr/lib/xen/bin/xc_save 10 19 2 0 0 0
ERROR (XendCheckpoint:234) Couldn''t map p2m_frame_list_list (errno 14):
14
ERROR (XendCheckpoint:234) Save exit rc=1
ERROR (XendCheckpoint:106) Save failed on domain winxp-snap1 (2).

errno 14 is Bad Address.

I have heard that save is broken on VT, and I was wondering whether
there is any rough timeline and what needs to be fixed.  I also heard
that the problem may be in Qemu.  Could someone verify whether this is
the case?

Regards,
John

p.s. should this have gone to xen-devel?

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Save and restore is not implemented for HVM domains.  The error your
seeing is an attempt to do a paravirtual save on an HVM domain (doh!).  We
could probably have a better error message here.

In theory, save/restore won''t be that hard for HVM domains.  Since QEMU
already supports saving/restore the hardware state, adapting that
shouldn''t be that hard.

Unfortunately, save/restore hardware support is broken in some of the
devices QEMU emulates right now.  Specifically, I believe USB and the
Cirrus chipsets are both not working properly.

Regards,

Anthony Liguori

On Mon, 10 Jul 2006 17:03:12 -0700, John McCullough wrote:
> Hello,
> 
> I am working with WinXP on xen-unstable and LVM.  I am interested in the
> current status of the xm save/restore functionality.  Currently, using xm
> save results in a failure.
> 
> Using:
> # xm save winxp-snap0 winxp-snap0.save
> 
> I receive on the console:
> Error: /usr/lib/xen/bin/xc_save 10 19 3 0 0 0 failed
> 
> Within xend.log the most relevant portion is: DEBUG (XendCheckpoint:83)
> [xc_save]: /usr/lib/xen/bin/xc_save 10 19 2 0 0 0 ERROR
> (XendCheckpoint:234) Couldn''t map p2m_frame_list_list (errno 14):
14 ERROR
> (XendCheckpoint:234) Save exit rc=1 ERROR (XendCheckpoint:106) Save failed
> on domain winxp-snap1 (2).
> 
> errno 14 is Bad Address.
> 
> I have heard that save is broken on VT, and I was wondering whether there
> is any rough timeline and what needs to be fixed.  I also heard that the
> problem may be in Qemu.  Could someone verify whether this is the case?
> 
> Regards,
> John
> 
> p.s. should this have gone to xen-devel?


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>
> Save and restore is not implemented for HVM domains.  The error your
> seeing is an attempt to do a paravirtual save on an HVM domain (doh!).  We
> could probably have a better error message here.
>
> In theory, save/restore won''t be that hard for HVM domains.  Since
QEMU
> already supports saving/restore the hardware state, adapting that
> shouldn''t be that hard.
>
> Unfortunately, save/restore hardware support is broken in some of the
> devices QEMU emulates right now.  Specifically, I believe USB and the
> Cirrus chipsets are both not working properly.
>

I''m working with Window 2003 and was hoping to soon begin testing live
migrations.  Is there support for live migration with HVM domains in
Xen-unstable?


Thanks,
Jim



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> I''m working with Window 2003 and was hoping to soon begin testing
live
 > migrations.  Is there support for live migration with HVM domains in
 > Xen-unstable?
no, it''s even mor far away than save/restore, because this will be the 
first step, then migration and then possibly live-migration!
-- 

Chau y hasta luego,

Thorolf

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