Re: [Qemu-devel] [PATCH v18 13/14] memory backend: fill memory backend ram fields

[Paolo Bonzini]

Il 26/02/2014 10:10, Igor Mammedov ha scritto:
> if we assume that NUMA policies apply to every hostmem derived backend,
> then we could realize() approach used by DEVICE. i.e.
> set NUMA policies in hostmem.c:hostmemory_backend_memory_init()
>
> Add parent_complete field to ram-backend class and store there parent's
> complete pointer. Then we can do:
>
> ram_backend_memory_init(UserCreatable *uc, Error **errp) {
>     memory_region_init_ram();
>     ...
>     MEMORY_BACKEND_RAM_CLASS(uc)->parent_complete(uc, errp);
>     ...
> }

The problem is that some backends might not be handled the same way. 
For example, not all backends might produce a single void*/size_t pair 
for the entire region.  Think of a "composite" backend that produces a 
large memory region from two smaller ones.

Paolo