Difference between revisions of "Nova/USB device hot cold plug"

Revision as of 09:04, 4 March 2014

USB device hot/cold plug features

Background

Adding usb devices to a exist vm is a necessary supplement features to usb device passthrough.

User scenarios

When a user transfers money online, him may need to attach a usb-key provided by bank to vm for authentication.

Technical verification

1. Test case

   (1)Attaching different type and number usb controllers and usb devices to vm when vm in diffrent status(running, stopped and so on).
   (2)Detaching usb devices from vm when vm in diffrent status(running, stopped and so on).

2. Xml definition

   (1)Sample of usb controller:
  <controller type='usb' index='2' model='piix3-uhci'/>
  <controller type='usb' index='1' model='ehci'/>

  (2)Sample of pass-through usb devices
  <hostdev mode='subsystem' type='usb'>
   < source>
    <vendor id='0x136b'/>
    <product id='0x0003'/>
    <address bus='2' device='2'/>
   </source>
   <address type='usb' bus='1' port='1'/>
  </hostdev>

  (3)Command of adding usb controller:
       virsh attach-device vm usb.xml --config
       virsh attach-device vm usb.xml

  (4)Command of removing usb controller:
       virsh detach-device vm usb.xml --config
       virsh detach-device vm usb.xml

3. The test results

Proposed solution

1. Use cases

2. System requirements and things should be considered(An optional Implementation):