Send a hotplug notification that a region of memory is going to be disconnected. The kernel will stop making allocations there, and eventually it won't be in us

Send a hotplug notification that a region of memory is going to be disconnected. The kernel will stop making allocations there, and eventually it won't be in use. (This could take a while for a heavy system with long-running processes.) Then you send the hotplug physical disconnect notification. If it fails, you'll need to wait longer. If it succeeds, the host system can reclaim the memory.