Appendix – Host OS Configuration

1.0

With Linux environment on host OS, additional kernel boot parameters may be required to support SNAP related features:

  • To use SR-IOV:

    • For Intel, "intel_iommu=on iommu=pt" must be added

    • For AMD, "amd_iommu=on iommu=pt" must be added

  • To use PCIe hotplug, pci=realloc must be added

  • modprobe.blacklist=virtio_blk for non-built in virtio-blk driver

To view boot parameter values, use the command cat /proc/cmdline.

It is recommended to use the following with virtio-blk:

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[dpu] cat /proc/cmdline BOOT_IMAGE … pci=realloc modprobe.blacklist=virtio_blk

To enable VFs (virtio_blk/NVMe):

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echo 125 > /sys/bus/pci/devices/0000\:27\:00.4/sriov_numvfs

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cat /proc/cmdline BOOT_IMAGE=(hd0,msdos1)/vmlinuz-5.15.0_mlnx root=UUID=91528e6a-b7d3-4e78-9d2e-9d5ad60e8273 ro crashkernel=auto resume=UUID=06ff0f35-0282-4812-894e-111ae8d76768 rhgb quiet iommu=pt intel_iommu=on pci=realloc modprobe.blacklist=virtio_blk

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cat /proc/cmdline cat /proc/cmdline BOOT_IMAGE=(hd0,msdos1)/vmlinuz-5.15.0_mlnx root=UUID=91528e6a-b7d3-4e78-9d2e-9d5ad60e8273 ro crashkernel=auto resume=UUID=06ff0f35-0282-4812-894e-111ae8d76768 rhgb quiet iommu=pt amd_iommu=on pci=realloc modprobe.blacklist=virtio_blk

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