<driver> as child element of <controller>

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Specifies details that are related to the user space process used to implement the controller.

Text content

None.

Selected attributes

iothread=<IOthread-ID>
Assigns a certain I/O thread to the user space process. Use this attribute to ensure best performance.

<IOthread-ID> is a value between 1 and the number of I/O threads which is specified by the iothreads element.

iommu="on"
For virtio devices on guests that are to run in IBM® Secure Execution mode: with this attribute, you enable the device to use the guest's bounce buffer. Use this attribute only if the launchSecurity element at the virtual server level is not an option.

With the preferred launchSecurity element, you enable all virtio devices to use the bounce buffer by default, see Preparing the virtual server.

Usage

Parent elements

<controller>

Child elements

None.

Example

<domain>
    ...
    <iothreads>2</iothreads>
    ...
    <devices>
         <controller type="scsi" model="virtio-scsi" index="0">
            <driver iothread="2"/>
            ..
        </controller>
    </devices>
    ....
</domain>