2017-01-03 22:50, Walker, Benjamin: > 1) Physical addresses cannot be exposed to unprivileged users due to security > concerns (the fallout of rowhammer). Therefore, systems without an IOMMU can > only support privileged users. I think this is probably fine. > 2) The IOCTL from vfio to pin the memory is tied to specifying the DMA address > and programming the IOMMU. This is unfortunate - systems without an IOMMU > still > want to do the pinning, but they need to be given the physical address instead > of specifying a DMA address. > 3) Not all device types, particularly in virtualization environments, support > vfio today. These devices have no way to explicitly pin memory.
In VM we can use VFIO-noiommu. Is it helping for mapping?
