VMX_DMA_KVA
ring->txd = VMX_DMA_KVA(&ring->dmamem);
comp_ring->txcd = VMX_DMA_KVA(&comp_ring->dmamem);
ring->rxd = VMX_DMA_KVA(&ring->dmamem);
comp_ring->rxcd = VMX_DMA_KVA(&comp_ring->dmamem);
memset(VMX_DMA_KVA(&ring->dmamem), 0,
memset(VMX_DMA_KVA(&comp_ring->dmamem), 0,
memset(VMX_DMA_KVA(&ring->dmamem), 0,
memset(VMX_DMA_KVA(&comp_ring->dmamem), 0,