Host to Host DMA

Hello,

Can somebody point me to a reference example that does a Host to Host DMA, if it exists?

I've come across the Avalon Memory Mapped DMA that does host to FPGA, and FPGA to host DMA.

I've also found reference examples with MSGDMA being controlled by NIOS.

I have not found anything that does a round-trip DMA, either Avalon MM or MSGDMA.

Any pointers will be appreciated.

Thanks,

~S.