Real time input/output address translation for virtualized systems

A device, comprising:

• a routing circuit adapted to be coupled to a peripheral device;
• a system memory management unit (SMMU) coupled to the routing circuit, the SMMU comprising a translation buffer unit (TBU) and a translation control unit (TCU);
• a physical address table (PAT) coupled to the routing circuit;
• a peripheral virtualization unit (PVU) coupled to the routing circuit;
• and
• a memory coupled to the routing circuit, to the SMMU, to the PAT, and to the PVU;
• wherein the routing circuit is configured to:
• receive a request comprising an address;
• send the request to an instance of the PAT in accordance with the address;
• and
• wherein the instance of the PAT is configured to cross reference the address with a translated address, the address and the translated address are both one of intermediate physical addresses or physical addresses.

A method comprising:

• receiving, by a routing circuit, a request, from a peripheral device, the request comprising an address and an attribute;
• in response to determining that the attribute is a first type, forwarding, by the routing circuit, the request to a system memory management unit (SMMU);
• in response to determining that the address matches an address in a physical address table (PAT), forwarding, by the routing circuit, the request to the PAT;
• and
• in response to determining that the address does not match an address in the PAT and that the attribute is a second type, selecting, by the routing circuit, a peripheral virtualization unit (PVU) instance from PVU instances.