[KVM] Failed to start the KVM guest with "No IOMMU found. Unable to assign device "hostdev0" " error message.

Issue

• Failed to start the KVM guest vm with the following messages.

Error: Domain rhel6-vm could not be started
Error: internal error process exited while connecting to monitor: char device redirected to / dev/pts/2
No IOMMU found. Unable to assign device "hostdev0"
qemu-kvm:-device pci-assign, host = 04:10.0, id = hostdev0, configfd = 27, bus = pci.0, addr = 0x6: Device 'pci-assign' could not be initialized