[Xen-devel] Re: Trivial patch to fix logging level output by XendCheckpoint.py

["Daniel P. Berrange" <berrange@xxxxxxxxxx>]

On Mon, Nov 20, 2006 at 04:34:22PM -0600, Anthony Liguori wrote:
> Daniel P. Berrange wrote:
> >On Mon, Nov 20, 2006 at 04:34:25PM -0500, Graham, Simon wrote:
> >>Signed-off by: Simon Graham <Simon.Graham@xxxxxxxxxxx>
> 
> >And even more importantly, once we get the error reporting patches 
> >integrated
> >into libxc, having the xc_linux_save/restore calls made by XenD directly
> >would ensure we get reliable error handling for save/restore operations.
> 
> It used to work that way.  xc_linux_save/restore were factored out of 
> Xend late in the 3.0 dev process.  I believe the idea was that they 
> should be executed with lower privileges (which is why they take file 
> descriptors as command line arguments instead of just calling 
> xc_interface_open() like you would expect).
>
> I believe it was Christian who was driving this.  Perhaps he has a few 
> more details?

Ok, looking back at the HG logs it appears  # 5099 

 "Execute xc_linux_restore in a seperate process so that it can't
  crash xend.  Also handle errors passed from xc_linux_restore and
  log info messages from xc_linux_restore."

and # 5121:

 "Implement the parts of vm save which need interaction with xend
  as part of xend, instead of using xfrd.
  Execute xc_linux_save in a seperate process so that it can't
  crash xend. Also handle errors passed from xc_linux_save.

are where these programs came into existance.

Regards,
Dan.
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