Re: [Qemu-devel] [PATCH 0/2] rdma: Utilize ibv_reg_mr_iova for memory registration

[Marcel Apfelbaum]

Hi Yuval,

On 8/18/19 4:21 PM, Yuval Shaia wrote:
> The virtual address that is provided by the guest in post_send and
> post_recv operations is related to the guest address space. This
> address
> space is unknown to the HCA resides on host so extra step in these
> operations is needed to adjust the address to host virtual address.
>
> This step, which is done in data-path affects performances.
>
> An enhanced verion of MR registration introduced here
> https://patchwork.kernel.org/patch/11044467/ can be used so that the
> guest virtual address space for this MR is known to the HCA in host.

Nice work on kernel side !
Thanks,
Marcel

> This will save the data-path adjustment.
>
> patch #1 deals with what is needed to detect if the library installed in
> the host supports this function
> patch #2 enhance the data-path ops by utilizing the new function
>
> Yuval Shaia (2):
>    configure: Check if we can use ibv_reg_mr_iova
>    hw/rdma: Utilize ibv_reg_mr_iova for memory registration
>
>   configure                 | 28 ++++++++++++++++++++++++++++
>   hw/rdma/rdma_backend.c    | 13 +++++++++++++
>   hw/rdma/rdma_backend.h    |  5 +++++
>   hw/rdma/rdma_rm.c         |  5 +++++
>   hw/rdma/vmw/pvrdma_main.c |  6 ++++++
>   5 files changed, 57 insertions(+)