On Mon, Mar 17, 2025 at 12:28:48PM +0100, Michal Privoznik via Devel wrote:
If a guest changes MAC address on its vNIC, then QEMU emits NIC_RX_FILTER_CHANGED event (the event is emitted in other cases too, but that's not important right now). Now, domain XML allows users to chose whether to trust these events or not: <interface trustGuestRxFilters='yes|no'/> For the 'no' case no action is performed and the event is ignored. But for the 'yes' case, some host side features of corresponding vNIC (well tap/macvtap device) are tweaked to reflect changed MAC address. But what is missing is reflecting this new MAC address in domain XML. Basically, what happens is: the host sees traffic with new MAC address, all tools inside the guest see the new MAC address (including 'virsh domifaddr --source agent') which makes it harder to match device in the guest with the one in the domain XML. Therefore, report this new MAC address as another attribute of the <mac/> element: <mac address="52:54:00:a4:6f:91" guestAddress="00:11:22:33:44:55"/> Signed-off-by: Michal Privoznik <mprivozn@xxxxxxxxxx>
Reviewed-by: Martin Kletzander <mkletzan@xxxxxxxxxx>
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