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From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
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Subject: Re: [Qemu-devel] [RFC PATCH 0/3] x86: Add support for guest DMA
 dirty page tracking
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To: "Michael S. Tsirkin" <mst@redhat.com>
Cc: Lan Tianyu <tianyu.lan@intel.com>, Yang Zhang <yang.zhang.wz@gmail.com>, Alex Williamson <alex.williamson@redhat.com>, kvm@vger.kernel.org, qemu-devel@nongnu.org, "linux-pci@vger.kernel.org" <linux-pci@vger.kernel.org>, x86@kernel.org, "Dr. David Alan Gilbert" <dgilbert@redhat.com>, Alexander Duyck <alexander.duyck@gmail.com>, "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>, Alexander Graf <agraf@suse.de>, Alexander Duyck <aduyck@mirantis.com>

> You can create a dummy device in guest for the duration of migration.
> Use guest agent to move IP address there and that should be enough to trick most guests.

If you are doing this  - why not bond the physical NIC with an virtual device
and unplug the physical NIC?