Xen devel - Sep 2005 - Live Migration algorithm in Xen Unstable ; tracing pre-copying stage

Hi,

I want to understand Migration and Live Migration in Xen and to trace the 
code
which implements it.

I had read the "Live Migration of Virtual Machines" doc 
from the Architecture page of Xen WebSite.
http://www.cl.cam.ac.uk/netos/papers/2005-migration-nsdi-pre.pdf

Two Migrations methods are being dealt with: Managed Migration and Self 
Migration.

The work of Managed Migration is done with daemons weheras the work of Self 
Migration is being done mostly on the OS which is being migrated.

I remeber I saw in some 2.0.* version an xfrd daemon which handled live 
migration (if I am not wrong). I assume that it was a implementation of 
Managed Migration.

In xen-unstable the xfrd it is removed.

I have two questions:

1) Is the live migration in xen-unstable implemented via Managed Migration
or Self Migration ? In case it is a Managed Migration - what is the daemon
who is managing this ? 

2) Show me the code: 
As I understand , much of the live migration process is based on using 
shadow pages and a dirty bitmap vector (shadow.c, shadow_guest32.c 
,shadow_public in arch/x86 in the case of intel x386). 

Where is the migration implementation in Xen-unstable ? I mean , for a 
start, where is the code for the pre-copying stage ,which is the first stage 
in migration, 
and is used by both methods, Managed and Self Migration ? 

Regards,
Rami Rosen


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Rami Rosen wrote:
> Hi,
> 
>    I want to understand Migration and Live Migration in Xen and to trace
> the code
> which implements it.
> 
>   I had read the "Live Migration of Virtual Machines" doc
> from the  Architecture page of Xen WebSite.
> http://www.cl.cam.ac.uk/netos/papers/2005-migration-nsdi-pre.pdf
> 
>  Two Migrations methods are being dealt with: Managed Migration and Self
> Migration.
Hi,

I am currently rewriting self-migration in Linux for Xen 3. Right now it
is at a stage where it can live-checkpoint itself to disk, and resume
from the checkpoint with my cstrap bootloader. I will post the code when
it is ready.

The managed migration is (if it works right now) in the normal Xen tree.

Jacob

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