Pcie peripheral sharing

A controller comprising:

• a single root controller interface configured to couple to a peripheral device that includes a physical function and a plurality of virtual functions;
• a first endpoint interface including a first cloned instance of the physical function and multiple virtual functions;
• a second endpoint interface including a second cloned instance of the physical function;
• and
• a virtualization unit configured to map through the single root controller interface:
• a first virtual function of the plurality of virtual functions to one of the first cloned instance of the physical function, the second cloned instance of the physical function, and the multiple virtual functions.

A method comprising:

• determining, by a controller, that a peripheral device is coupled to a root controller interface of the controller, wherein the peripheral device has a physical function and a plurality of virtual functions associated with the physical function;
• creating a first set of address translation entries to map a first subset of the plurality of virtual functions to a first cloned instance of the physical function at a first endpoint interface of the controller;
• presenting, at the first endpoint interface, the first subset of the plurality of virtual functions, using the first set of address translation entries and a first translation unit associated with the first endpoint interface;
• creating a second set of address translation entries to map a second subset of the plurality of virtual functions to a second cloned instance of the physical function at a second endpoint interface of the controller;
• and
• presenting, at the second endpoint interface, the second subset of the plurality of virtual functions, using the second set of address translation entries and a second translation unit associated with the second endpoint interface.

A method comprising:

• coupling a peripheral device that includes a physical function and a plurality of virtual functions to a single root controller interface of a controller;
• configuring a first endpoint interface of the controller with a first cloned instance of the physical function and multiple virtual functions;
• configuring a second endpoint interface of the controller with a second cloned instance of the physical function;
• and
• mapping through the single root controller interface, using a virtualization unit of the controller, a first virtual function of the plurality of virtual functions to one of the first cloned instance of the physical function, the second cloned instance of the physical function, and the multiple virtual functions.