Libvirt is just a wrapper that controls the hypervisor. With KVM hosts, we look for the kvm_intel or kvm_amd modules, signifying that there's hardware support for paravirtualization. We don't see it in virtualbox, because it doesn't support nested paravirtualization (It's the vmx flag that you see in /proc/cpuinfo, missing in virtualbox guests but not in fusion or KVM guests). KVM and fusion do support it, hence we can run devcloud there.
Xen devcloud doesn't require the vmx flag to be present on the cpu, so we can run it in virtualbox. On Thu, May 2, 2013 at 2:41 PM, kel...@backbonetechnology.com < kel...@backbonetechnology.com> wrote: > Hate to be that guy, but it's the other way around.. Xen does provide > paravirtualization, KVM does not, but libvirt does with Qemu. > > Virtualbox is PV only not HAV > > http://en.m.wikipedia.org/wiki/Paravirtualization > > :) > > Sent from my HTC > > ----- Reply message ----- > From: "Marcus Sorensen" <shadow...@gmail.com> > To: "dev@cloudstack.apache.org" <dev@cloudstack.apache.org> > Subject: Dev/Test Environment > Date: Thu, May 2, 2013 1:22 PM > > Virtualbox doesn't support nested virtualization (unless they just barely > added it), which is why we have to use fusion (or KVM if you run linux) for > the KVM version of devcloud. Vbox works for the Xen devcloud though > because it doesn't require the Xen guests to have paravirtualization, > whereas cloudstack KVM guests do. > > > On Thu, May 2, 2013 at 2:17 PM, Joe Brockmeier <j...@zonker.net> wrote: > > > On Thu, May 2, 2013, at 03:16 PM, Joe Brockmeier wrote: > > > On Thu, May 2, 2013, at 01:44 PM, Soheil Eizadi wrote: > > > > The wiki is organized around VirtualBox, assuming it works, I think > it > > is > > > > a better choice than Fusion since it free and easy to setup. I don't > > have > > > > much experience with VirtualBox, does it not support nested > > hypervisors? > > > > > > If you've gotten something working in Fusion, it would be worth putting > > > that on the wiki for folks who aren't a fan of VirtualBox. (Or folks > who > > > already use Fusion and don't want to run two desktop virt. products...) > > > > Didn't complete my thought - would be worth putting on the wiki *on a > > new page* so that it's not conflicting with the "standard" DevCloud > > info. > > > > Best, > > > > jzb > > -- > > Joe Brockmeier > > j...@zonker.net > > Twitter: @jzb > > http://www.dissociatedpress.net/ > > >
