Hi, Recent changes in pseries code (not yet pushed, available at David's ppc-for-6.0) are using the QAPI event MEM_UNPLUG_ERROR to report memory hotunplug errors in the pseries machine.
The pseries machine is also using a timeout to cancel CPU hotunplugs that takes too long to finish (in which we're assuming a guest side error) and it would be desirable to also send a QAPI event for this case as well. At this moment, there is no "CPU_UNPLUG_ERROR" in QAPI (guess ACPI doesn't need it). Before sending patches to implement this new event I had a talk with David Gibson and he suggested that, instead of adding a new CPU_UNPLUG_ERROR event, we could add a generic event (e.g. DEVICE_UNPLUG_ERROR) that can be used by the pseries machine in both error scenarios (MEM and CPU). This could also be used by x86 as well, although I believe the use of MEM_UNPLUG_ERROR would need to be kept for awhile to avoid breaking ABI. Any suggestions/comments? Thanks, DHB
