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This patch fills in the functionality of processNicRxFilterChangedEvent(). It now checks if it is appropriate to respond to the NIC_RX_FILTER_CHANGED event (based on device type and configuration) and takes appropriate action. Currently it checks if the guest interface has been configured with trustGuestRxFilters='yes', and if the host side device is macvtap. If so, and the MAC address on the guest has changed, the MAC address of the macvtap device is changed to match. The result of this is that networking from the guest will continue to work if the mac address of a macvtap-connected network device is changed from within the guest, as long as trustGuestRxFilters='yes' (previously changing the MAC address in the guest would break networking).
LibVirt : simple API for virtualization
Libvirt is a C toolkit to interact with the virtualization capabilities
of recent versions of Linux (and other OSes). It is free software
available under the GNU Lesser General Public License. Virtualization of
the Linux Operating System means the ability to run multiple instances of
Operating Systems concurrently on a single hardware system where the basic
resources are driven by a Linux instance. The library aim at providing
long term stable C API initially for the Xen paravirtualization but
should be able to integrate other virtualization mechanisms if needed.
Daniel Veillard <veillard@redhat.com>