Computer, device control system, and device control method for direct memory access

A device control method comprising:

• executing, by a host computer, a first direct memory access (DMA) transfer based on a DMA transfer request received from a driver, the first DMA transfer transferring data to a transfer destination address, and
• executing, by the host computer, a second DMA transfer to transfer data existing at the transfer destination address of a first memory of the host computer to a second memory of a second computer, the transfer destination address being detected as a result of executing the first DMA transfer, wherein
• the host computer is communicably connected with the second computer,
• the host computer includes a first memory and a driver for controlling a device of the second computer,
• the second computer further comprises an input/output (I/O) memory management unit and a second driver,
• a record is recorded by a storage unit which the I/O memory management unit manages,
• the second driver acquires the transfer destination address by executing retrieval in the storage unit, and
• the second driver:
• requests the second DMA to transfer,
• receives an interrupt from the device when the second DMA is completed, and
• initiates a data transfer between the first memory and the second memory using receipt of the interrupt as a trigger.