Sharing iommu mappings across devices in a dma group

A system comprising:

• a first input/output (I/O) device;
• a second I/O device;
• a physical memory comprising a memory location;
• an I/O memory management unit (MMU) comprising a direct memory access (DMA) group translation table;
• a host operating system (OS) configured to:
• create a DMA group;
• add the first I/O device and the second I/O device to the DMA group;
• instruct the I/O MMU to create a shared virtual DMA address in the DMA group translation table;
• map the memory location to the shared virtual DMA address in the DMA group translation table;
• and
• provide the shared virtual DMA address to the first device driver and the second device driver;
• a first I/O device driver configured to:
• determine that the first I/O device has received DMA group data;
• and
• instruct a first DMA controller to transfer the DMA group data from the first I/O device to the memory location corresponding to the shared virtual DMA address;
• and
• a second I/O device driver configured to:
• determine that the memory location corresponding to the shared virtual DMA address has received the DMA group data;
• and
• instruct a second DMA controller to transfer the DMA group data from the memory location corresponding to the shared virtual DMA address to the second I/O device.

A method for sharing an input/output (I/O) memory management unit translation table comprising:

• creating a direct memory access (DMA) group;
• adding a first input/output (I/O) device port to the DMA group, wherein the first I/O device port is associated with a first I/O device and a first device driver executing on a host;
• adding a second I/O device port to the DMA group, wherein the second I/O device port is associated with a second I/O device and a second device driver executing on the host;
• instructing an I/O memory management unit (MMU) to create a DMA group translation table comprising a shared virtual DMA address;
• mapping a memory location within a physical memory to the shared virtual DMA address in the DMA group translation table;
• providing the shared virtual DMA address to the first device driver and the second device driver;
• determining that the first I/O device port has received DMA group data;
• instructing, by the first device driver, a first DMA controller to transfer the DMA group data from the first I/O device port to the memory location corresponding to the shared virtual DMA address;
• determining that the memory location corresponding to the shared virtual DMA address has received the DMA group data;
• instructing, by the second device driver, a second DMA controller to transfer the DMA group data from the memory location corresponding to the shared virtual DMA address to the second I/O device port.