Re: [Qemu-devel] [RFC v2 4/6] hostmem: return recreated MemoryRegion if current can't be reused

[Paolo Bonzini]

On 08/06/2015 17:19, Igor Mammedov wrote:
>  MemoryRegion *
>  host_memory_backend_get_memory(HostMemoryBackend *backend, Error **errp)
>  {
> +    UserCreatableClass *ucc = USER_CREATABLE_GET_CLASS(backend);
> +
> +    if (memory_region_is_hva_mapped(&backend->mr)) {
> +        object_unparent(OBJECT(&backend->mr));
> +        ucc->complete(USER_CREATABLE(backend), errp);
> +    }

I'm not sure I understand this, and the commit message... doesn't help.

Is it for the case where you unplug memory and then reuse the old
backend?  Can we just outlaw this, forcing each memory backend to be
used only once?

Paolo