Direct I/O access for system co-processors

A method comprising:

• receiving a notification of an access request message at a virtual address mapped to one of a memory of a remote direct access (RDMA) device and a memory of a peripheral device further including a central processing unit (CPU);
• in response to receiving the access request message at a virtual address mapped to the memory of the RDMA device:
• utilizing the virtual address mapped to the memory of the RDMA device as an RDMA parameter;
• and
• transmitting an RDMA access request to the RDMA device based on the access request message for the memory of the RDMA device from the peripheral device and including a virtual address RDMA parameter;
• and
• in response to receiving the access request message at a virtual address mapped to the memory of the peripheral device, transmitting an access request message to the memory of the peripheral device.

An apparatus comprising:

• a first interconnect link communicatively coupled to a remote direct memory access (RDMA) device;
• a second interconnect link communicatively coupled to a peripheral device including a central processing unit (CPU) and a memory;
• and
• a platform controller hub (PCH) to:
• receive a notification of an access request message at a virtual address included in the PCH and mapped to one of the memory of the peripheral device or a memory of the RDMA device;
• in response to receiving the access request message at a virtual address mapped to a memory of the RDMA device, transmit an RDMA access request to the RDMA device based on the access request message for the memory of the RDMA device from the peripheral device, the RDMA access request message to include a virtual address RDMA parameter;
• and
• in response to receiving the access request message at a virtual address mapped to the memory of the RDMA device, transmit an access request message to the memory of the peripheral device.