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. 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(+) -- 2.20.1
