Hi Lonnie,
your Qemu output looks quite fine - similar to the output of my (successful) test. Both USB mouse and keyboard are detected by the USB driver. I have to click into the Qemu window to move Genode's mouse cursor though.
Just as a guess regarding your test machine, maybe the failure is caused by the use of the IOMMU, which is enabled for NOVA by default? To rule out this possible problem, could you please try to remove the "iommu" argument from the NOVA hypervisor by editing the line 76 of base-nova/run/env as follows:
puts $fh " module /hypervisor iommu serial" -> puts $fh " module /hypervisor serial"
As another test, you could restrict the USB driver to not touch USB 3.0 by removing the 'xhci="yes"' configuration at ports/run/seoul.inc line 251:
<config uhci="yes" ehci="yes" xhci="yes"> -> <config uhci="yes" ehci="yes">
For getting deeper insights into what does wrong on your test machine, I'd recommend to use Intel AMT to capture the serial output of the machine over the network.
Cheers Norman