[libvirt] [PATCH 0/5] macvtap support for Qemu/KVM VMs via libvirt

[Stefan Berger]

Daniel,

  some of this code doesn't build anymore due to the recent changes with 
the conn parameter being removed. 
Do you want me to re-submit?
  I actually liked the conn parameter for error reporting and handling in 
the return path. Any function
where the conn parameter was needed, I anticipated a simple return code 
for success and failure with the 
error already attached to the 'conn' parameter via one of the error 
reporting functions. Other functions 
where the conn parameter was not passed, the return value was anticipated 
to have an 'errno meaning'. Now 
that meaning seems lost. I am wondering whether I can still leave the conn 
parameter as an ATTRIBUTE_UNUSED
for those functions where I only anticipate a success/failure return and 
error already being reported
via a function?

Regards,
   Stefan


libvir-list-bounces at redhat.com wrote on 02/08/2010 02:35:43 PM:

> 
> Hello!
> 
>   This is a re-post of previously posted patches following Daniel
> Berrange's request for changes along with other fixes.
> 
>   The following patches provide support for making the macvtap
> networking device type available to Qemu/KVM VMs. The patches rely on
> the macvtap driver that just became available through the Linux net-next
> tree (fixes still may be necessary) and make the device available to
> Qemu/KVM via a tap file descriptor similar to a 'regular' tap device.
>   Following up on previous discussions, the libvirt patches allow using
> the following XML in the domain description to enable qemu network
> connectivity via this type of device:
> 
>     <interface type='direct'>
>       <source dev='eth1' mode='vepa'/>
>       <model type='virtio'/>
>     </interface>
> 
>   The above XML indicates that eth1 is the Ethernet interface to link
> the macvtap device to and communicate to the network. As a consequence,
> libvirt will create an instance of a macvtap device, assign it the same
> MAC address as the VM's interface has and open a file descriptor of the
> associated character device /dev/tap%d and pass it via command line to
> Qemu/kvm. In the above XML the mode can be chosen as 'vepa', 'private'
> or 'bridge' and is by default set to 'vepa'(by the driver) if omitted.
> 
> Attachment and detachment of macvtap to/from a running VM also works.
> 
> Regards,
>    Stefan
> 
> 
> 
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