Xen devel - Jan 2008 - Kernels: Xen''s kernel and dom0''s kernel

Hi all,
  Am a lil confused with this. I''m tryin to develop something
that''s supposed to run on the Xen kernel but how sure can I be?
According to a colleague I''m actually coding on dom0''s kernel.
Point me to the right directions please? Thank u.

       
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>   Am a lil confused with this. I''m tryin to develop something
that''s
> supposed to run on the Xen kernel but how sure can I be? According to a
> colleague I''m actually coding on dom0''s kernel. Point me
to the right
> directions please? Thank u.
Xen itself is a hypervisor - it''s a thin "kernel"-like entity
that runs
directly on the hardware in the system and controls access to that hardware 
at a low level.

Instead of running processes, Xen runs "domains".  A domain is a
running guest
operating system.  Dom0 is the first domain to be started, then you may start 
a number of other less privileged domains.

If you''re writing tools, management apps, etc then you would target the
userspace environment of domain 0 - this is usually much the same as a normal 
Linux environment.  It''s insulated from the low level features of Xen
by the
Linux kernel it is running on - Linux itself is what is running on top of 
Xen.

If you''re writing something that would run as a guest operating system,
then
you''re writing a guest operating system kernel to run directly on top
of Xen.

Cheers,
Mark

-- 
Push Me Pull You - Distributed SCM tool (http://www.cl.cam.ac.uk/pmpu/)

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