Enabling Nested KVM In Devstack on Fusion

There are times (like when you’re figuring out a post like this) that you will need to fire up devstack in a VM, and in said VM ensure KVM is running. Here’s how to do that:

1. Add ‘vmv.allow = TRUE’ to the VMX file. I do this in vagrant like so:

# VMware Fusion
config.vm.provider "vmware_fusion" do |vmware, override|
    override.vm.box = "trusty64_fusion"
    ... snip ...
    vmware.vmx["memsize"] = "6144"
    vmware.vmx["numvcpus"] = "2"
    vmware.vmx["vhv.enable"] = "TRUE"
end

1. Install KVM into the VM:

sudo apt-get update && sudo apt-get install -y kvm libvirt-bin virtinst

1. Run kvm-ok

~# kvm-ok
INFO: /dev/kvm exists
KVM acceleration can be used

1. Finally, run ./stack.sh