Heteromorphic I/O discovery and handshake

A computing device in communication with an input/output (I/O) device providing virtualized hardware resources for use by a plurality of virtual function (VF) drivers of a plurality of virtual machines (VMs), wherein the first computing device executes a virtual machine manager (VMM) that implements a physical function (PF) driver and a plurality of base address registers (BARs) exposed by the I/O device, wherein the PF driver is associated with the plurality of VF drivers implemented by the plurality of VMs, and

• wherein the PF driver is configured to:
• receive a request message from a VF driver of the plurality of VF drivers, the request message including a request to adapt at least one of the BARs exposed by the I/O device;
• adapt the at least one of the BARs exposed by the I/O device according to the request message;
• and
• provide a confirmation message to the VF driver indicating the adaptation to the at least one of the BARs exposed by the I/O device;
• and
• wherein the VF driver is associated with the PF driver and the I/O device for providing virtualized hardware resources, and wherein the VF driver is configured to:
• receive an indication of the plurality of BARs exposed by the I/O device;
• perform an internal probe and analysis to determine a target adaptation of the at least one of the BARs exposed by the I/O device;
• send the request message to the PF driver;
• receive the confirmation message from the PF driver;
• and
• access regions of memory allocated to the plurality of BARs exposed by the I/O device and adapted according to the target adaptation.