Re: [libvirt] [PATCH 4/4] qemu: support live change of all netdev hostside config

This is the final patch to resolve: https://bugzilla.redhat.com/show_bug.cgi?id=805071 This patch finalizes support live change of any/all hostside config of a network device as part of the public virDomainUpdateDeviceFlags API. The changes are done without detaching the device from the guest, so hopefully disruptions are kept to a minimum. Two new functions are created for the task - qemuDomainDetachNetHostSide() and qemuDomainAttachHostSide() - which detach and reattach just the host side of a network device, while leaving the PCI device on the guest side still attached. Calling these two functions in sequence allows us to completely change the host side of the device, including type of tap device, where the tap is connected, bandwidth/vlan/virtualport settings, etc.