13.3. Troubleshooting SR-IOV
This section contains solutions for problems which may affect SR-IOV.
- Error starting the guest
- When starting a configured virtual machine, an error occurs as follows:
# virsh start test error: Failed to start domain test error: internal error unable to start guest: char device redirected to /dev/pts/2 get_real_device: /sys/bus/pci/devices/0000:03:10.0/config: Permission denied init_assigned_device: Error: Couldn't get real device (03:10.0)! Failed to initialize assigned device host=03:10.0
This error is often caused by a device that is already assigned to another guest or to the host itself. - Error migrating, saving, or dumping the guest
- Attempts to migrate and dump the virtual machine cause an error similar to the following:
# virsh dump --crash 5 /tmp/vmcore error: Failed to core dump domain 5 to /tmp/vmcore error: internal error unable to execute QEMU command 'migrate': An undefined error has occurred
Because device assignment uses hardware on the specific host where the virtual machine was started, guest migration and save are not supported when device assignment is in use. Currently, the same limitation also applies to core-dumping a guest; this may change in the future.
