Kernel is old. QEMU is old. Please burn whatever instructions caused you to arrive at that <qemu:commandline> abomination. If you need to do that, it suggests your libvirt is also old. There's a good change dmesg is filled with errors indicating insufficient locked memory limits for the user precisely because the assigned device is hidden from libvirt inside the <qemu:arg> parameters. Those would lead to the memory listener errors in QEMU.
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