[libvirt] How can I attach a network interface to KVM machine

Daniel P. Berrange berrange at redhat.com
Tue Apr 7 19:23:43 UTC 2009

On Tue, Apr 07, 2009 at 05:30:02PM +0400, Anton Protopopov wrote:
> Hi.
> When I am trying to attach an interface
>     <interface type='bridge'>
>       <mac address='52:54:00:db:1a:bb'/>
>       <source bridge='mkvebr0'/>
>     </interface>
> libvirt reports me, that
>      libvirt.libvirtError: this function is not supported by the hypervisor:
> this device type cannot be attached
> Is there a legal way to attach a network interface to QEMU/KVM machine?

Not at this time. The QEMU monitor interface doesn't provide sufficient
functionality to be able todo this, because there's no way to pass have
libvirt create & setup the TAP device, and then pass it to QEMU. The
QEMU monitor needs to gain the ability to do SCM_RIGHTS to accept an
open file handle before we can hotplug NICs in any useful manner.

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