[openstack-dev] [third-party][ci] openstack CI VM template

Daniel P. Berrange berrange at redhat.com
Tue Feb 28 13:59:16 UTC 2017

On Tue, Feb 28, 2017 at 07:49:01AM -0600, Mikhail Medvedev wrote:
> On Tue, Feb 28, 2017 at 2:52 AM, Guo, Ruijing <ruijing.guo at intel.com> wrote:
> > Hi, CI Team,
> >
> >
> >
> > I’d like to know if openstack CI VM support nested virtualization.
> >
> OpenStack CI infrastructure is using nested visualization inside of
> devstack VMs to perform tempest testing. But at the moment accel=tcg
> is used (emulation) for second level virt. IIRC it is done because
> some of the provider clouds had problems with KVM acceleration.

FYI, the QEMU & KVM maintainers still recommend *against* use of
nested-KVM in any production deployment, since they are not confident
of the security at this time. ie risk a level-2 guest could potentially
break out into either the level-1 guest or the physical host. This is
why the kvm kernel module requires an explicit opt-in to enable nested-KVM
on a host.

nested-KVM is improving, but there's no target date when it will
be considered ready for production use.

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