On Wed, Nov 4, 2020 at 5:30 AM Roja Eswaran <reswa...@binghamton.edu> wrote: > > I am using Jetson Xavier NX which integrates a Realtek RTL8211FDI Gigabit > Ethernet controller. The on-module Ethernet controller supports 10/100/1000 > Gigabit Ethernet IEEE 802.3u Media Access Controller (MAC). > I am trying to assign Non-PCI NIC mentioned above directly to the Vanilla > VM. As it's not a PCI device, I have no idea how I can achieve this. > > 1) Is it possible to do a direct assignment on Non-PCI devise to VM using > VFIO drivers?
I don't see any mention of an IOMMU in any of these 3 DT files: https://elixir.bootlin.com/linux/latest/source/arch/arm64/boot/dts/nvidia/tegra194-p2972-0000.dts https://elixir.bootlin.com/linux/latest/source/arch/arm64/boot/dts/nvidia/tegra194-p2888.dtsi https://elixir.bootlin.com/linux/latest/source/arch/arm64/boot/dts/nvidia/tegra194.dtsi Does the Jetson Xavier NX board have an iommu? If not, this is the most fundamental reason you wouldn't be able to use VFIO for assignment on that board -- especially if the ethernet controller is DMA-capable, since you won't be able to ensure the ethernet device's DMAs operate on the memory assigned to the guest. You could check for this by doing "dmesg | grep -i -e iommu -e smmu" on the device and seeing if it prints anything, or looking at /sys/kernel/iommu_groups to see if that dir exists. Beyond the IOMMU, vfio-platform/QEMU in their current state wouldn't be able to handle the embedded PHY device here: https://elixir.bootlin.com/linux/latest/source/arch/arm64/boot/dts/nvidia/tegra194-p2888.dtsi#L43 , which would be another hurdle. > 2) If not, are there any other drivers that would help me achieve the direct > assignment? > The direct assignment is important because we are trying to reduce the CPU > utilization even though virtio drivers give us a very small network latency > overhead. Any comments or insights are really appreciated. Thank you so much > for your time! > > > -- > Thanks, > Roja Eswaran > Ph.D. Student, Operating Systems and Networks Laboratory > State University of New York, Binghamton > _______________________________________________ > vfio-users mailing list > vfio-users@redhat.com > https://www.redhat.com/mailman/listinfo/vfio-users _______________________________________________ vfio-users mailing list vfio-users@redhat.com https://www.redhat.com/mailman/listinfo/vfio-users
