VMX_DMA_DVA
ts->cmd_ring = VMX_DMA_DVA(&ring->dmamem);
ts->comp_ring = VMX_DMA_DVA(&comp_ring->dmamem);
rs->cmd_ring[0] = VMX_DMA_DVA(&rq->cmd_ring[0].dmamem);
rs->cmd_ring[1] = VMX_DMA_DVA(&rq->cmd_ring[1].dmamem);
rs->comp_ring = VMX_DMA_DVA(&comp_ring->dmamem);