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Implement the suspend callback allowing to suspend the virtqueues so they stop processing descriptors. This is required to allow to query a consistent state of the virtqueue while live migration is taking place. Signed-off-by: Eli Cohen <elic@nvidia.com> Message-Id: <20220714113927.85729-2-elic@nvidia.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>