PCI pass though (Ethernet port)

Virtualization , Comments 
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ifconfig

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[root@SMC-KVM ~]# ethtool -i eno2
driver: ixgbe
version: 4.18.0-305.10.2.el8_4.x86_64
firmware-version: 0x800007f6, 1.1747.0
expansion-rom-version:
bus-info: 0000:01:00.1
supports-statistics: yes
supports-test: yes
supports-eeprom-access: yes
supports-register-dump: yes
supports-priv-flags: yes

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# vim /etc/grub2-efi.cfg
# vim /etc/grub2.cfg
set kernelopts="...iommu.passthrough=1"

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Enable intel iommu:

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vim /etc/default/grub

GRUB_CMDLINE_LINUX="... intel_iommu=on iommu=pt
#GRUB_CMDLINE_LINUX=" ... amd_iommu=on

If intel_iommu=on or amd_iommu=on works, you can try replacing them with iommu=pt or amd_iommu=pt.

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grub2-mkconfig -o /boot/grub2/grub.cfg
cat /etc/grub2.cfg | grep 'set kernelopt' # 这时候上面的设置已经被映射过来了
reboot
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dmesg | grep IOMMU

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Modify VM’s specification:

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cp /etc/libvirt/qemu/cjl-test.xml /etc/libvirt/qemu/cjl-test.xml.bak
vim /etc/libvirt/qemu/cjl-test.xml
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<hostdev mode='subsystem' type='pci' managed='yes'>
<source>
<address domain='0x0000' bus='0x01' slot='0x00' function='0x1'/>
</source>
##<address type='pci' domain='0x0000' bus='0x01' slot='0x02' function='0x0'/>
</hostdev>

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virsh define &VMname
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ethtool -i eno2
ethtool -i eno1

Guest (VM)

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[root@localhost ~]# lspci | grep Ethernet
00:02.0 Ethernet controller: Intel Corporation Ethernet Controller 10G X550T (rev 01)
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[root@localhost ~]# ethtool -i ens2
driver: ixgbe
version: 4.18.0-305.10.2.el8_4.x86_64
firmware-version: 0x800007f6, 1.1747.0
expansion-rom-version:
bus-info: 0000:00:02.0
supports-statistics: yes
supports-test: yes
supports-eeprom-access: yes
supports-register-dump: yes
supports-priv-flags: yes