Reset of single root PCI manager and physical functions within a fabric

A method of managing reset of a single-root PCI manager that includes at least one physical function of an I/O device in a computing system, the method comprising:

• determining whether a physical function included within the single-root PCI manager is associated with a virtual function;
• upon determining that the physical function is associated with a virtual function, resetting the single-root PCI manager without resetting the physical function;
• after resetting the single-root PCI manager, monitoring whether any active virtual functions are associated with the physical function;
• and
• upon determining that no active virtual functions are associated with the physical function, resetting the physical function.

A system for managing I/O operations in a multi-partition virtualization system implemented at least in part in a computing device, the system comprising:

• a first partition within the multi-partition virtualization system, the first partition residing in a first memory location within the computing device and including a single-root PCI manager, the single-root PCI manager including a physical function associated with an I/O device;
• a second partition within the multi-partition virtualization system, the second partition residing in a second memory location within the computing device and including a virtual function associated with the physical function;
• and
• a trusted control block stored in a third memory location separate from each of the first and second partitions, the trusted control block allowing reset of the single-root PCI manager without allowing;
• reset of the physical function if the virtual function is active, the trusted control block including instructions which allow the physical function to be reset, after the single-root PCI manager is reset, upon determining that no active virtual functions are associated with the physical function;
• wherein the trusted control block associates the configuration memory space with the reset physical function, thereby maintaining association between the physical function and the virtual function.