[libvirt-users] Can't get PCI passthrough working

I'm trying to get PCI passthrough working by passing through a DVB-T TV card to a VM running MythTV. When I assign the PCI devices in virt-manager and attempt to start the VM I get this error: Error starting domain: internal error: process exited while connecting to monitor: 2015-09-06T12:41:09.725990Z qemu-kvm: -device vfio-pci,host=05:02.0,id=hostdev0,bus=pci.0,addr=0x9: vfio: error, group 11 is not viable, please ensure all devices within the iommu_group are bound to their vfio bus driver. 2015-09-06T12:41:09.726034Z qemu-kvm: -device vfio-pci,host=05:02.0,id=hostdev0,bus=pci.0,addr=0x9: vfio: failed to get group 11 2015-09-06T12:41:09.726049Z qemu-kvm: -device vfio-pci,host=05:02.0,id=hostdev0,bus=pci.0,addr=0x9: Device initialization failed. 2015-09-06T12:41:09.726064Z qemu-kvm: -device vfio-pci,host=05:02.0,id=hostdev0,bus=pci.0,addr=0x9: Device 'vfio-pci' could not be initialized I've followed a whole load of instructions and made teh settings below: - Updated /etc/sysconfig/grub tp add intel_iommu=on: GRUB_CMDLINE_LINUX="rd.lvm.lv=centos/root rd.lvm.lv=centos/swap rhgb quiet intel_iommu=on" - Allowed unsafe interrupts in /etc/modprobe.d/PME-vfio_iommu_type1.conf: options vfio_iommu_type1 allow_unsafe_interrupts=1 - Blacklisted the PCI card's drivers in /etc/modprobe.d/blacklist.conf so they don't get grabbed by the CentOS hypervisor host: blacklist cx8800 blacklist cx8802 blacklist cx88_dvb blacklist cx88-mpeg Can anyone please advise why I'm getting that error preventing the VM from booting?