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Add the VDUSE_F_QUEUE_READY feature flag. This allows the kernel module to explicitly signal userspace when a specific virtqueue has been enabled. In scenarios like Live Migration of VirtIO net devices, the dataplane starts after the control virtqueue allowing QEMU to apply configuration in the destination device. Signed-off-by: Eugenio Pérez <eperezma@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Message-ID: <20260707122502.239022-5-eperezma@redhat.com>