[Qemu-devel] [Question] memory: AddressSpace backed by single IO MemoryRegion

[Marcel Apfelbaum <marcel.apfelbaum@gmail.com>]

Hi all,

I have an AddressSpace backed by a single MemoryRegion which is
initiated using memory_region_init_io (has ops).
Once I enable it, I get an assertion:
    exec.c:806: register_subpage: Assertion `existing->mr->subpage || existing->mr == &io_mem_unassigned' failed.


Here is the pseudo-code:
    memory_region_init_io(my_reg, owner, my_ops, my_obj, "my region", INT64_MAX);
    memory_region_set_enabled(my_reg, false);
    address_space_init(my_as, my_reg, name);
    memory_region_set_enabled(my_reg, true);
Receives:
    exec.c:806: register_subpage: Assertion `existing->mr->subpage || existing->mr == &io_mem_unassigned' failed.

Any idea why? Any suggestion would be appreciated.
Thanks,
Marcel