[one-users] Configure hosts to use qemu without kvm hardware acceleration

[Javier Fontan]

OpenNebula can be configured to use qemu emulation instead of kvm
virtualization but not per VM but in the driver definition. The type
of the VM driver can be changed from "kvm" to "qemu" in oned.conf. For
example:

--8<------
VM_MAD = [
    name       = "kvm",
    executable = "one_vmm_ssh",
    arguments  = "-t 15 -r 0 kvm",
    default    = "vmm_ssh/vmm_ssh_kvm.conf",
    type       = "qemu" ]
------>8--

This is used in the tryout images as they are already virtualized. It
will be also useful for the infrastructure Marco Fanti wants to
create.

Still this is not useful to have mixed virtualized and emulated
machines in the same host. Maybe this parameter can be changed to a VM
setting instead of a driver setting.

On Tue, Mar 25, 2014 at 10:28 AM, Carlo Daffara
<carlo.daffara at cloudweavers.eu> wrote:
> It is nevertheless an interesting feature. For example, when emulating legacy OSes like DOS or Windows 3.11 you
> have to disable KVM anyway, or the OS does not boot. (And yes, we *do* have sometimes to bring legacy operating systems
> into OpenNebula :-))
> Maybe we can add it as a feature? It should be mainly a matter of passing the "-no-kvm" switch....
> cheers,
> Carlo Daffara
>
> ----- Messaggio originale -----
> Da: "Jon" <three18ti at gmail.com>
> A: "Marco Fanti" <marco.fanti at studenti.polito.it>
> Cc: "Users OpenNebula" <users at lists.opennebula.org>
> Inviato: Martedì, 25 marzo 2014 10:20:50
> Oggetto: Re: [one-users] Configure hosts to use qemu without kvm hardware       acceleration
>
>
>
> Shouldn't qemu fallback to "paravitualization" when hardware acceleration isn't available?
>
> http://blog.vmsplice.net/2011/03/should-i-use-qemu-or-kvm.html?m=1
>
> I was confident that qemu could detect on the fly if hardware virtualization was available and would enable it or not as appropriate. until your post...
>
> Are you getting an error with OpenNebula?
>
> Thanks,
> Jon A
> On Mar 25, 2014 1:41 AM, "Marco Fanti" < marco.fanti at studenti.polito.it > wrote:
>
>
>
> Hi all,
> I'm building a testing environment and I need to use some kvm virtual machines as host nodes.
> Since I cannot enable the hardware acceleration inside a virtual machine*, I'd like to know how to configure a host node like the configuration that there is in the kvm sandbox (that actually use qemu-kvm with the parameter -no-kvm).
> As frontend node and host nodes I'm using Debian 7, and opennebula is installed from the .deb packages for Debian 7 downloaded from the opennebula website.
>
> Thank you all,
> Marco Fanti
>
> *I know it is possible to enable nested kvm inside kvm, the guide is http://palexster.wordpress.com/2013/03/06/enable-nested-virtualization-on-kvm/ ,
> BUT this features has a lot of bug, especially in the "old" versions of kvm like the one in Debian Stable, so I'd like a more stable solution, like to use qemu without kvm as in the kvm sandbox
>
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-- 
Javier Fontán Muiños
Developer
OpenNebula - The Open Source Toolkit for Data Center Virtualization
www.OpenNebula.org | @OpenNebula | github.com/jfontan