Sorry for coming late to the party on this... I only read qemu-devel
through a filter so I missed all the discussions on the new memory
API. I have a question as to how it works and how it's supposed to
work in certain scenarios.
It's a question of flow. I'm following the code path through the
creation of a new memory subregion. If I'm reading this properly, it
would seem that a MemoryRegion - for example the ones used by VGA - go
through the following flow:
memory_region_init_ram() - (mr->destructor is set to
memory_region_destructor_ram)
memory_region_add_subregion(system_memory, ...) ->
memory_region_update_topology() ->
address_space_update_topology()
address_space_update_topology_part()
as_memory_range_add() - through the ops vector
memory_region_prepare_ram_addr()
At this point it seems that the destructor is overwritten with the
memory_region_destructor_iomem(), and it loses track of the proper way
to ever free the memory region. Is this correct, or am I missing
something?
Or does it not matter because nobody ever calls memory_region_destroy
for system memory regions?
Thanks,
-John