On Tue, May 30, 2023 at 06:59:25PM +0100, Joao Martins wrote: > Much like pci_device_iommu_address_space() fetches the IOMMU AS, add a > pci_device_iommu_memory_region() which lets it return an the IOMMU MR > associated with it. The IOMMU MR is returned correctly for vIOMMUs using > pci_setup_iommu_info(). Note that today most vIOMMUs create the address > space and IOMMU MR at the same time, it's just mainly that there's API > to make the latter available.
Have you looked into other archs outside x86? IIRC on some other arch one address space can have >1 IOMMU memory regions.. at least with such AS and MR layering it seems always possible? Thanks, -- Peter Xu
