First, 'intel_iommu=on' has to be added to the kernel cmdline.
Secondly, libvirt gives a message what the error is: no IOMMU.
Third, the Virtualization Guide states that for Intel-based machines with IOMMU support (a requirement for passthrough/device-assignment), you have to add 'intel_iommu=on' to the kernel cmdline.
First, 'intel_iommu=on' has to be added to the kernel cmdline. device- assignment) , you have to add 'intel_iommu=on' to the kernel cmdline.
Secondly, libvirt gives a message what the error is: no IOMMU.
Third, the Virtualization Guide states that for Intel-based machines with IOMMU support (a requirement for passthrough/