[Intel-gfx] refactor the i915 GVT support and move to the modern mdev API v3

[Christoph Hellwig]

On Thu, Apr 14, 2022 at 11:38:59AM -0300, Jason Gunthorpe wrote:
> pull requests can flow through more than one tree concurrently. The
> purpose of the topic branch is to allow all the commits to be in all
> the trees they need to be in at once.
> 
> So you should send this branch as a PR to the next logical upstream
> tree gvt patches normally go through, in the usual way that you send
> PRs. Especially in this case where there is a small merge conflict
> internal to DRM to resolve. I'm assuming this is the drm-intel-next
> tree?
> 
> Once DRM is internally happy then VFIO can merge it as well. You can
> view VFIO as the secondary path to Linus, DRM as primary. Alex will
> mention in his pull request that VFIO has a 'shared branch with DRM
> for gvt'.

Where do we stand here?  The (somewhat misnamed) topic/for-christoph
branch looks fine to me now except for the mіssing "static inline" on
the intel_gvt_iterate_mmio_table stub.

When can we expect it in the i915 tree and linux-next?