Re: [Xen-users] Xen questions (Be kind)

[Jeff Sturm <jeff.sturm@xxxxxxxxxx>]

> -----Original Message-----
> From: mywildimagination@xxxxxxxxx [mailto:mywildimagination@xxxxxxxxx]
> Sent: Monday, February 27, 2012 1:17 PM
> 
> I'm not talking about dom0 (Or maybe I am), I am logging into the host OS, is 
> this the
> same as logging into the dom0 VM?

Yes.

> So if I look at TOP in the host SSH login am I just looking at the resources 
> used by
> dom0?

Correct.

What you have is a Xen hypervisor running on the bare hardware, with two 
guests: A dom0 instance (which must always be running), and a domU 
(unprivileged guest OS that you can start/stop as needed).  The difference 
between the two guests is that the dom0 is privileged--Xen allows it to 
directly access most hardware, in particular the PCI bus.  The hypervisor 
itself does not provide a means for direct interactive commands, so instead  
you log into dom0 to issue hypervisor commands.

The figure in this page may help to explain: 
http://libvirt.org/architecture.html

-Jeff

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