To successfully use the DIO feature, you must be running the appropriate software and assign only the PCIe cards that are supported by the DIO feature to I/O domains. For the hardware and software requirements, see Direct I/O Hardware and Software Requirements in Oracle VM Server for SPARC 18.104.22.168, 3.1.1, and 3.1 Release Notes .
To add or remove PCIe endpoint devices by using the direct I/O feature, you must first enable I/O virtualization on the PCIe bus itself.
You can use the ldm set-io or ldm add-io command to set the iov property to on. You can also use the ldm add-domain or ldm set-domain command to set the rc-add-policy property to iov. See the ldm(1M) man page.
Rebooting the root domain affects direct I/O, so carefully plan your direct I/O configuration changes to maximize the direct I/O-related changes to the root domain and to minimize root domain reboots.