Re: [Qemu-devel] [RFC PATCH RDMA support v3: 03/10] documentation of RDMA protocol in docs/rdma.txt

[Michael R. Hines]

On 03/11/2013 01:05 PM, Michael S. Tsirkin wrote:
> Well that's exactly the question. As far as I remember the RDMA memory 
> model, you need to know a key and address to execute RDMA writes. 
> Remote memory also needs to be locked, so you need some mechanism to 
> lock chunks of memory, do RDMA write and unlock when done. 

Yes, memory is registered before the write occurs - that's is all taken 
care of in rdma.c (patch #04/10)

Same answer for the SEND messages: memory for each send must be 
registered before you send.

The pinning (mlock()) is already handled by libibverbs (by calling the 
function ibv_reg_mr()) - standard infiniband protocol initialization.

- Michael