drm/virtio: not pin pages on demand

[Gerd Hoffmann]

On Thu, Oct 21, 2021 at 09:44:45AM +0200, Maksym Wezdecki wrote:
> From: mwezdeck <maksym.wezdecki at collabora.co.uk>
> 
> The idea behind the commit:
>   1. when resource is created, let user space decide
>      if resource should be pinned or not
>   2. transfer_*_host needs pinned memory. If it is not
>      pinned, then pin it.
>   3. during execbuffer, decide which bo handles should
>      be pinned based on the list provided by user space

When you never need cpu access to your gpu object there is
no need to create a resource in the first place.

take care,
  Gerd