"host doesn't support passthrough of host PCI devices" Displayed During NIC Passthrough Configuration

Symptom

The error message "host doesn't support passthrough of host PCI devices" is displayed when SR-IOV NIC passthrough is configured for a VM.

Key Process and Cause Analysis

The system memory management unit (SMMU) or input/output memory management unit (IOMMU) must be enabled for the VM to configure NIC passthrough.

Conclusion and Solution

1. Open the grub2.cfg file:

   vim /etc/grub.cfg

2. Add the following content:

   iommu.passthrough=1

   

3. Press Esc, type :wq!, and press Enter to save the file and exit.
4. Restart the server for the configuration to take effect.