Re: tap and xvif devices

[Christoph Egger <Christoph_Egger%gmx.de@localhost>]

Goran wrote:
> Hi all,
> 
> when I start a HVM enabled VM I got for every xvif nic one tap nic. One
> of my VM config files shows the line:
> 
> vif = [ 'type=ioemu, bridge=bridge0' ]
> 
> I can't connect by the xvif devices anyway. The tap devices are working.
> 
> My question: Why do xvifX.Y devices exist when using "type=ioemu"?

HVM guests may use paravirtualized (PV) drivers. The xvifX.Y devices
are used for the guest's PV drivers.

The Dom0 can't know if the HVM guest has PV drivers or not. Therefore,
you always see both xvifX.Y and tap devices.

Christoph