NIOS II memory to access from hardware block

Hello all,

I have a question regarding NIOS II processor. I have some situation where I have to send some allocated memory (By NIOS II software running on it) data to the hardware processing block. I am using on-chip memory as of now as the memory for NIOS II memory.

To get my work done I am thinking that, if I connect another Avalon Master port from my hardware block to the on-chip memory slave port, and then send the start of the memory address I want to copy, to the hardware block(maybe from custom instruction). Then the hardware block would read and write directly from on-chip memory. (Making sure that there are no concurrent access to the same memory locations)
Is there any complications doing this? have anyone tried this before?