Re: [Xen-users] how to create a full-virtualization xen VM with autoyast

[Alexandre Kouznetsov <alk@xxxxxxxxxx>]

Hello.

El 19/03/13 19:00, Jing Chen escribió:
> Can you help to clarify what is difference between vmlinuz-xenpae.sles11.sp2
> and hvmloader? can full-virtualization VM be create using
> vmlinuz-xenpae.sles11.sp2  and initrd like Para-virtualization VM.
A fully virtualized DomU does not care about guest system's kernel or 
initrd. It does not even provide a boot loader for it. It attempts to 
emulate a whole computer, and the guest system is booted as if it where 
on a normal host. So, a fully virtualized DomU can not be created using 
a kernel and initrd files, as PV DomU.
In case of a PV DomU, the guest kernel interacts directly with Xen's low 
level hypervisor.
In case of HVM DomU, there is an additional layer between guest kernel 
and the hypervisor: qemu. Hvmloader's job is "to load all the necessary 
information that qemu will use to build the necessary environment that 
will "fool" an unmodified guest that he is in fact on a physical machine 
is needed by qemu".
http://wiki.xen.org/wiki/Hvmloader

As you may see, PV and HVM guests works in a quite different manner. If, 
by chance, they are configured and run in a similar way, that is because 
there is wrapper for that.
(If I'm wrong, please somebody correct me.)

Greetings.

--
Alexandre Kouznetsov


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