Xen devel - Dec 2011 - [help] what's the relationship between vif*.* and tap*.* in vm?

Hi everyone,
     A pair of network interface, vif and tap, will connect the bridge when a vm
starts. What's their relationship?
     thanks for reply~
  
 cheers
 bruce

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On 26.12.2011 04:30, ¤終於aware wrote:
> Hi everyone,
>  A pair of network interface, vif and tap, will connect the bridge
> when a vm starts. What's their relationship?
>  thanks for reply~
>
> cheers
> bruce
If I understand correctly, the vif is a virtual interface that works 
with pv drivers in domU.  The tap is a Qemu interface that is used with 
HVMs that don't have pv drivers.  So, if you start a HVM domU, you'll 
have the vif that Xen creates and the tap that Qemu creates, if pv 
drivers are available, then once they are loaded Domu uses them and the 
tap goes away, but if not then both remain, but only the tap interface 
is being used.  Obviously, if you need more detailed explaination, then 
I'm of no further use.:)
Mike

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