[Engine-devel] [libvirt]Supporting native USB in oVirt

[Hans de Goede]

Hi,

On 05/10/2012 02:12 PM, Hans de Goede wrote:
> Hi,
>
> On 05/10/2012 01:39 PM, Oved Ourfalli wrote:
>> Rephrasing my question a bit, to make it more clear.
>> We are now working on adding the support for native USB devices on oVirt.
>>
>> This requires adding composite PCI devices to a VM (details below), requiring specific set of restrictions on the addresses of these devices, and the connections between them.
>> Is it possible to add such a composite set of devices to a VM while using automatic address assignment, as we do today on the other PCI devices?
>
> To be clear, what the ovirt-engine people want to do (AFAIK), is add an EHCI controller
> with UHCI companion controllers to a vm, which would normally be done in the xml file
> like this:
>
> <controller type='usb' index='0' model='ich9-ehci1'>
> <address type='pci' domain='0x0000' bus='0x00' slot='0x08' function='0x7'/>
> </controller>
> <controller type='usb' index='0' model='ich9-uhci1'>
> <master startport='0'/>
> <address type='pci' domain='0x0000' bus='0x00' slot='0x08' function='0x0' multifunction='on'/>
> </controller>
> <controller type='usb' index='0' model='ich9-uhci2'>
> <master startport='2'/>
> <address type='pci' domain='0x0000' bus='0x00' slot='0x08' function='0x1'/>
> </controller>
> <controller type='usb' index='0' model='ich9-uhci3'>
> <master startport='4'/>
> <address type='pci' domain='0x0000' bus='0x00' slot='0x08' function='0x2'/>
> </controller>
>
> Without manually specifying the addresses, ie they want to be able to write
> something like:
>
> <controller type='usb' index='0' model='ich9-ehci1'>
> </controller>
> <controller type='usb' index='0' model='ich9-uhci1'>
> <master startport='0'/>
> </controller>
> <controller type='usb' index='0' model='ich9-uhci2'>
> <master startport='2'/>
> </controller>
> <controller type='usb' index='0' model='ich9-uhci3'>
> <master startport='4'/>
> </controller>
>

As indicated by danpb in a follow up mail fixing this so that the following:

<controller type='usb' index='0' model='ich9-ehci1'>
</controller>
<controller type='usb' index='0' model='ich9-uhci1'>
</controller>
<controller type='usb' index='0' model='ich9-uhci2'>
</controller>
<controller type='usb' index='0' model='ich9-uhci3'>
</controller>

Will work should be doable, a bug has been filed for tracking this:
https://bugzilla.redhat.com/show_bug.cgi?id=820869

Regards,

Hans