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



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


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