On Wed, Feb 12, 2025 at 01:56:55PM +0000, Robin Murphy wrote: > On 2025-02-07 2:46 pm, Jason Gunthorpe wrote: > > virtio-iommu has a mode where the IDENTITY domain is actually a paging > > domain with an identity mapping covering some of the system address > > space manually created. > > > > To support this add a new domain_alloc_identity() op that accepts > > the struct device so that virtio can allocate and fully finalize a > > paging domain to return. > > Oh, I'd already managed to forget this idea - this could be convenient for > DART to implement per-instance identity domain support as well. If we are going to broaden this someday then I suggest the core code should implement it entirely buy asking the driver for a paging domain and then mapping all of system memory into it. There is nothing special here that needs to be in driver code. Jason
