Okay, the error came back... (can't go unnoticed, it was painfully slow again)
open /dev/kvm: Permission denied
Could not initialize KVM, will disable KVM support
Turns out that the ownership is reset after 'qemu-kvm' is restarted. As a workaround I added 'chgrp kvm /dev/kvm' in the 'pre-start script' section of /etc/init/qemu-kvm.conf.
Okay, the error came back... (can't go unnoticed, it was painfully slow again)
open /dev/kvm: Permission denied
Could not initialize KVM, will disable KVM support
Turns out that the ownership is reset after 'qemu-kvm' is restarted. As a workaround I added 'chgrp kvm /dev/kvm' in the 'pre-start script' section of /etc/init/ qemu-kvm. conf.