[PATCH v2 4/9] iommufd: Convert to alloc_domain_paging()

[Tian, Kevin]

> From: Jason Gunthorpe <jgg at nvidia.com>
> Sent: Thursday, September 28, 2023 7:48 AM
> 
> Move the global static blocked domain to the ops and convert the
> unmanaged
> domain to domain_alloc_paging.
> 
> Signed-off-by: Jason Gunthorpe <jgg at nvidia.com>

Reviewed-by: Kevin Tian <kevin.tian at intel.com>