Installation guide

Troubleshooting SR-IOV

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Device pci_0000_0b_10_0 dettached

10. Add the Virtual Function to the guest

a. Shut down the guest.

b. Use the output from the virsh nodedev-dumpxml pci_8086_10ca_0 command to

calculate the values for the configuration file. Convert slot and function values to hexadecimal

values (from decimal) to get the PCI bus addresses. Append "0x" to the beginning of the

output to tell the computer that the value is a hexadecimal number.

The example device has the following values: bus = 3, slot = 16 and function = 1. Use the

printf utility to convert decimal values to hexadecimal values.

$ printf %x 3

$ printf %x 16

$ printf %x 1

This example would use the following values in the configuration file:

bus='0x03'

slot='0x10'

function='0x01'

c. Open the XML configuration file with the virsh edit command. This example edits a guest

named MyGuest.

# virsh edit MyGuest

d. The default text editor will open the libvirt configuration file for the guest. Add the new device

to the devices section of the XML configuration file.

</source>

</hostdev>

e. Save the configuration.

11. Restart

Restart the guest to complete the installation.

# virsh start MyGuest

The guest should start successfully and detect a new network interface card. This new card is the

Virtual Function of the SR-IOV device.

13.3. Troubleshooting SR-IOV

This section contains some issues and solutions for problems which may affect SR-IOV.