Kernel panic on `vagrant up` using `qemu64` CPU model

[Patrick Nawracay]

Issuing a `vagrant up` on the notebook I use results in a kernel panic, when I use libvirt as provider for Vagrant.

Changing the CPU model from 'qemu64' (default) to 'kvm64' works, but has to be configured in the Vagrantfile manually. The same problem occurs if I start the VM using the virt-manager and without using Vagrant.

I don't have the same problem on another machine. It might be related to the hardware I use on my notebook.