Description of problem: Can't hotplug direct network interface Version-Release number of selected component (if applicable): libvirt-daemon-6.3.0-1.module+el8.3.0+6478+69f490bb.x86_64 qemu-kvm-5.0.0-0.module+el8.3.0+6612+6b86f0c9.x86_64 How reproducible: 100% Steps to Reproduce: 1. virsh start avocado-vt-vm1 2. virsh attach-interface --domain avocado-vt-vm1 --type 'direct' --source 'enp1s0' --mac '9a:cb:0c:26:ed:c0' --target 'test' --model 'virtio' --inbound '100,200,100' --outbound '200,300,200' Actual results: error: Failed to attach interface error: internal error: unable to execute QEMU command 'netdev_add': Invalid parameter type for 'vhost', expected: boolean Expected results: Interface attached successfully Additional info: 1. I believe Version should be 8.3 but wasn't available in drop-down. 2. Related commit in qemu https://github.com/qemu/qemu/commit/db2a380c84574d8c76d7193b8af8535234fe5156 3. libvirtd debug log ... 2020-05-13 14:49:03.768+0000: 12393: info : qemuMonitorSend:935 : QEMU_MONITOR_SEND_MSG: mon=0x7fef18033200 msg={"execute":"netdev_add","arguments":{"type":"tap","fd":"fd-net10","id":"hostnet1","vhost":"on","vhostfd":"vhostfd-net10"},"id":"libvirt-372"}^M fd=-1 2020-05-13 14:49:03.768+0000: 12536: info : qemuMonitorIOWrite:431 : QEMU_MONITOR_IO_WRITE: mon=0x7fef18033200 buf={"execute":"netdev_add","arguments":{"type":"tap","fd":"fd-net10","id":"hostnet1","vhost":"on","vhostfd":"vhostfd-net10"},"id":"libvirt-372"}^M len=143 ret=143 errno=0 2020-05-13 14:49:03.769+0000: 12536: debug : qemuMonitorJSONIOProcessLine:220 : Line [{"id": "libvirt-372", "error": {"class": "GenericError", "desc": "Invalid parameter type for 'vhost', expected: boolean"}}] 2020-05-13 14:49:03.769+0000: 12536: info : qemuMonitorJSONIOProcessLine:240 : QEMU_MONITOR_RECV_REPLY: mon=0x7fef18033200 reply={"id": "libvirt-372", "error": {"class": "GenericError", "desc": "Invalid parameter type for 'vhost', expected: boolean"}} 2020-05-13 14:49:03.769+0000: 12393: debug : qemuMonitorJSONCheckErrorFull:402 : unable to execute QEMU command {"execute":"netdev_add","arguments":{"type":"tap","fd":"fd-net10","id":"hostnet1","vhost":"on","vhostfd":"vhostfd-net10"},"id":"libvirt-372"}: {"id":"libvirt-372","error":{"class":"GenericError","desc":"Invalid parameter type for 'vhost', expected: boolean"}} 2020-05-13 14:49:03.769+0000: 12393: error : qemuMonitorJSONCheckErrorFull:416 : internal error: unable to execute QEMU command 'netdev_add': Invalid parameter 4. Reproduced with libvirt-daemon-6.0.0-17.module+el8.3.0+6423+e4cb6418.s390x qemu-kvm-4.2.0-19.module+el8.3.0+6473+93e27135.s390x 5. Not reproduced with libvirt-daemon-6.0.0-17.module+el8.3.0+6423+e4cb6418.x86_64 qemu-kvm-4.2.0-19.module+el8.3.0+6473+93e27135.x86_64 6. Possibly related https://bugzilla.redhat.com/show_bug.cgi?id=1832710
*** This bug has been marked as a duplicate of bug 1832710 ***