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Description of problem: Update the interface trustGuestRxFilters and backend setting return succeed but no changes Version-Release number of selected component (if applicable): libvirt-8.5.0-1.el9.x86_64 How reproducible: 100% Steps to Reproduce: 1. Start a vm with direct type interface as below: # virsh start vm2 Domain 'vm2' started # virsh dumpxml vm2 | grep /interface -B7 <interface type='direct' trustGuestRxFilters='yes'> <mac address='52:54:00:65:52:cb'/> <source dev='eno2' mode='bridge'/> <target dev='macvtap0'/> <model type='virtio'/> <alias name='net0'/> <address type='pci' domain='0x0000' bus='0x01' slot='0x00' function='0x0'/> </interface> 2. update the trustGuestRxFilters setting from "yes" to "no" by update-device: # cat direct.xml <interface type='direct' trustGuestRxFilters='no'> <mac address='52:54:00:65:52:cb'/> <source dev='eno2' mode='bridge'/> <target dev='macvtap0'/> <model type='virtio'/> <alias name='net0'/> <address type='pci' domain='0x0000' bus='0x01' slot='0x00' function='0x0'/> </interface> # virsh update-device vm2 direct.xml Device updated successfully 3. the update-device command succeed, but the live xml do not changes: # virsh dumpxml vm2 | grep /interface -B7 <interface type='direct' trustGuestRxFilters='yes'> <mac address='52:54:00:65:52:cb'/> <source dev='eno2' mode='bridge'/> <target dev='macvtap0'/> <model type='virtio'/> <alias name='net0'/> <address type='pci' domain='0x0000' bus='0x01' slot='0x00' function='0x0'/> </interface> Another scenario for backend: # virsh dumpxml vm2 | grep /interface -B8 <interface type='network'> <mac address='52:54:00:cf:af:c6'/> <source network='default' portid='1c06f82e-fa6c-4de9-9cac-8973b1db1eec' bridge='virbr0'/> <target dev='vnet1'/> <model type='virtio'/> <backend tap='/dev/net/tun' vhost='/dev/vhost-net'/> <alias name='net0'/> <address type='pci' domain='0x0000' bus='0x01' slot='0x00' function='0x0'/> </interface> # cat backend.xml <interface type='network'> <mac address='52:54:00:cf:af:c6'/> <source network='default' portid='1c06f82e-fa6c-4de9-9cac-8973b1db1eec' bridge='virbr0'/> <target dev='vnet1'/> <model type='virtio'/> <backend tap='/dev/net/tun1' vhost='/dev/vhost-net2'/> <alias name='net0'/> <address type='pci' domain='0x0000' bus='0x01' slot='0x00' function='0x0'/> </interface> # virsh update-device vm2 backend.xml Device updated successfully # virsh dumpxml vm2 | grep backend <backend tap='/dev/net/tun' vhost='/dev/vhost-net'/> Actual results: Use update-device to update trustGuestRxFilters attribute or backend elements, the command returns succeed, but the live xml does not update accordingly. Expected results: libvirt should return unsupported error if such elements can not be live updated Additional info: