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Re: [libvirt] [PATCH] Set a sensible default master start port for ehci companion controllers

On Tue, May 15, 2012 at 05:25:23AM -0400, Oved Ourfalli wrote:
> -device piix3-usb-uhci,id=usb,bus=pci.0,addr=0x1.0x2
> -device ich9-usb-ehci1,id=usb,bus=pci.0,addr=0x4.0x7
> -device ich9-usb-uhci1,masterbus=usb.0,firstport=0,bus=pci.0,multifunction=on,addr=0x4
> -device ich9-usb-uhci2,masterbus=usb.0,firstport=2,bus=pci.0,addr=0x4.0x1
> -device ich9-usb-uhci3,masterbus=usb.0,firstport=4,bus=pci.0,addr=0x4.0x2

Here we see the problem - we have a USB1 controller (piix3-usb0-uhci)
and the USB2 controller + companions.

Both the USB1 & USB2 controller are getting the same name.

>                 <controller type="usb">
>                         <address  domain="0x0000"  function="0x2"  slot="0x01"  type="pci" bus="0x00"/>
>                 </controller>

Here you have requested the USB1 controller (defaults to piix3-usb-uhci)
but ommitted the index= attribute, so it defaults to 0.

>                 <controller index="0" model="ich9-ehci1" type="usb"/>

And here you have requested USB2 controller also with index=0.

>                 <controller index="0" model="ich9-uhci1" type="usb">
>                         <master startport="0"/>
>                 </controller>
>                 <controller index="0" model="ich9-uhci2" type="usb">
>                         <master startport="2"/>
>                 </controller>
>                 <controller index="0" model="ich9-uhci3" type="usb">
>                         <master startport="4"/>
>                 </controller>

And these are the companions - it is correct that these have the same
index as the master controller.

Libvirt really ought to have raised an error about your XML with the
duplicated index for USB1 and USB2 controllers. Of course you can
just remove the USB1 controller from your XML and avoid the issue,
since the companions provide USB1 compatibility

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