On Fri, Jun 23, 2023 at 03:05:06PM -0700, Suthikulpanit, Suravee wrote: > For example, an AMD IOMMU hardware is normally listed as a PCI device (e.g. > PCI ID 00:00.2). To setup IOMMU PAS for this IOMMU instance, the IOMMU > driver allocate an IOMMU v1 page table for this device, which contains PAS > mapping. So it is just system dram? > The IOMMU hardware use the PAS for storing Guest IOMMU information such as > Guest MMIOs, DevID Mapping Table, DomID Mapping Table, and Guest > Command/Event/PPR logs. Why does it have to be in kernel memory? Why not store the whole thing in user mapped memory and have the VMM manipulate it directly? Jason
