I think this should solve a current issue I have with virtualbox dealing with nested VMs. For example, nested QEMU VM running in a Virtualbox Linux guest causes

I think this should solve a current issue I have with virtualbox dealing with nested VMs. For example, nested QEMU VM running in a Virtualbox Linux guest causes the guest to lock up. According to virtualbox forum thread, only virtualbox-in-virtualbox nesting is supported, so to get around this I use virt-manager. But I think this kvm backend should solve it.