virtio-gpu: Mapping blob resources

[Antonio Caggiano]

Hi,

I am trying to implement blob resource mapping support, but there is 
something I still did not manage to figure out.

According to the spec, VIRTIO_GPU_CMD_RESOURCE_MAP_BLOB maps a host-only 
blob resource into an offset in the host visible memory region. So, I 
believe I will need something like:

> void *data = g->hotstmem[mblob.offset]; // pseudo-code
> virgl_renderer_resource_map(..., &data, ...);

Questions:
- Does my approach make sense?
- How do I get an address to the host visible memory region?


Best regards,
Antonio