Most of the time will be spend on undocumented corner cases of third party hardware and dealing with various race conditions. Even though the PCIe protocol is r

Most of the time will be spend on undocumented corner cases of third party hardware and dealing with various race conditions. Even though the PCIe protocol is reasonably simple the devices attached to it are not. Since this feature is only viable if it works 100% reliable the rule of thumb is the last 20% of problems will cost you 80% of the time.