[PATCH v6 0/13] Migration Stream v2

[Andrew Cooper <andrew.cooper3@citrix.com>]

Hello,

Presented here for review is v6 of the Migration Stream v2 work.

v6 follows the integration of this code into XenServer, and having the full
suite of XenRT tests being run.  Included in these tests are live migrations
from 32bit toolstacks to 64bit toolstacks, using the python conversion script.
Several corruption issues have been located and fixed, as well as many minor
improvements.

In addition, performance tests have been performed.  After finding an initial
regression, the code uas been tweaked to use writev() in preference to
write() which vastly reduces the number of system calls performed.  The
performance is now better than the legacy code for all sizes of VM.

This series depends on several prerequisites which are still floating around
on the xen-devel mailing list.  These patches can be found in the
"saverestore2-v6" branch of:
  git://xenbits.xen.org/people/andrewcoop/xen.git
  http://xenbits.xen.org/git-http/people/andrewcoop/xen.git


The next area of work is the libxl integration, which will seek to undo the
current layering violations.  It will involve introducing a new libxl framing
format (which will happen to look curiously similar to the libxc framing
format), as well as providing legacy compatibility using the legacy conversion
scripts so migrations from older libxl/libxc toolstacks will continue to work.


The code is presented here for comment/query/critism.

~Andrew