On Fri, 22 Apr 2022 11:58:15 -0300 Jason Gunthorpe <jgg@xxxxxxxxxx> wrote: > > I don't see IOMMU_IOAS_IOVA_RANGES called at all, that seems like a > problem.. Not as much as you might think. Note that you also won't find QEMU testing VFIO_IOMMU_TYPE1_INFO_CAP_IOVA_RANGE in the QEMU vfio-pci driver either. The vfio-nvme driver does because it has control of the address space it chooses to use, but for vfio-pci the address space is dictated by the VM and there's not a lot of difference between knowing in advance that a mapping conflicts with a reserved range or just trying add the mapping and taking appropriate action if it fails. Thanks, Alex
