Are there any plans to support Memory Ballooning ?

[ihexon]

As time goes by, the memory allocated to the virtual machine will not be returned to the host. It would be better if the user could manually release this memory

[slp]

libkrun does implement virtio-balloon's free page reporting but, according to various reports from people developing memory allocators, macOS's behavior with MADV_DONTNEED is quite particular, and while it does mark the pages are reclaimable it doesn't really release them until they're really needed (that is, there's memory pressure on the system).

I've also tried with MADV_FREE_REUSABLE and it behaved in exactly the same way.