[PATCH v3 02/16] iommufd/viommu: Add a default_viommu_ops for IOMMU_VIOMMU_TYPE_DEFAULT

[Nicolin Chen]

On Thu, Oct 17, 2024 at 03:47:29PM -0300, Jason Gunthorpe wrote:
> On Wed, Oct 09, 2024 at 09:38:14AM -0700, Nicolin Chen wrote:
> > An IOMMU_VIOMMU_TYPE_DEFAULT doesn't need a free() op since the core can
> > free everything in the destroy(). Now with the new vDEVICE structure, it
> > might want to allocate its own vDEVICEs.
> > 
> > Add a default_viommu_ops for driver to hook ops for default vIOMMUs.
> 
> Why? arm_smmu is now creating its own viommu object, so who will use
> this?
> 
> Do we have any use for the default mode? It is already a bit
> confusing, can we just drop it?

Hmm, that would make the default model completely useless..

Should we unsupport a default viommu allocation?

Nicolin