Comment 16 for bug 741706

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In , Don (don-redhat-bugs) wrote :

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.