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Re: [Xen-devel] Control tools work

  • To: Charles Coffing <ccoffing@xxxxxxxxxx>
  • From: Christian Limpach <christian.limpach@xxxxxxxxx>
  • Date: Tue, 31 May 2005 22:07:54 +0100
  • Cc: xen-devel@xxxxxxxxxxxxxxxxxxx
  • Delivery-date: Tue, 31 May 2005 21:07:13 +0000
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On 5/31/05, Charles Coffing <ccoffing@xxxxxxxxxx> wrote:

> 1.  Providing a higher-level consistent API for domain actions
> (create, save, migrate, restore, pause, etc).

I'm no longer convinced there is a much higher API to have.  Except
for create and migrate, all the actions you list are already single
functions in libxc, migrate is save | restore.  It might be useful to
group several functions together for create, but it's not quite clear
how/where device configuration fits in there.

> I'm refactoring / rewriting / writing code in xutil, libxc, and xfrd
> (although it wouldn't be hard to slip libxen in there instead of libxc
> if that is the ultimate direction).  I hope to have something to show
> in a week or two.

Please note that xfrd does no longer exist in -unstable.  Also we
don't use libxutil anymore.
Xend handles the first half of a relocation itself and then runs the
xc_save or xc_restore helper programs to do the second part. During
the first part of a relocation, the xend domain configuration is
exchanged and the format of this part is specific to xend.  The
xc_save and xc_restore helpers are merely wrappers for the
xc_linux_save and xc_linux_restore functions and use pipes to
communicate with xend and write/read the virtual machine image to/from
a file handle or socket.


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