System and method for system firmware causing an operating system to idle a processor

1. A method comprising:

detecting loss of lockstep (LOL) for a processor module in a system;

responsive to said detecting LOL for the processor module system firmware instructing the system's operating system to idle the processor module and return control over the processor module to the system firmware; and

continuing operation of the processor module without lockstep protection, while awaiting for the operating system to idle the processor module and return control over the processor module to the system firmware.

2. The method of claim 1 further comprising:

determining if the LOL is immediately fatal.

3. The method of claim 2 further comprising:

performing said continuing operation if determined that the LOL is not immediately fatal.

4. The method of claim 3 further comprising:

if determined that the LOL is immediately fatal, ceasing operation of the processor module.

5. The method of claim 1 further comprising:

determining if lockstep can be recovered for the processor module without shutting down the system's operating system.

6. The method of claim 5 further comprising:

performing said continuing operation if determined that lockstep can be recovered for the processor module without shutting down the system's operating system.

7. The method of claim 6 further comprising:

ceasing operation of the processor module if determined that lockstep cannot be recovered for the processor module without shutting down the system's operating system.

8. The method of claim 1 further comprising:

said operating system idling the processor module and returning control over the processor module to the system firmware.

9. The method of claim 8 further comprising:

said system firmware reestablishing lockstep for the processor module, wherein said operating system is not shut down for said reestablishing.