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.

Daniel -- |: Red Hat, Engineering, London -o- http://people.redhat.com/berrange/:| |: http://libvirt.org -o- http://virt-manager.org -o- http://ovirt.org:| |: http://autobuild.org -o- http://search.cpan.org/~danberr/<http://search.cpan.org/%7Edanberr/>:| |: GnuPG: 7D3B9505 -o- F3C9 553F A1DA 4AC2 5648 23C1 B3DF F742 7D3B 9505 :|

On Wed, Apr 15, 2009 at 02:35:41PM +0400, Anton Protopopov wrote: > 2009/4/7 Daniel P. Berrange <berrange(a)redhat.com&gt; > > > 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. > > > And what about attaching a device to stopped machine? > Stop, attach, and start. Just as temporary decision. You can already add devices to stopped machines just by defining a new config file for them. We do need to make the attach/detach APIs for with inactive guests too for QEMU driver, since we allow this in the Xen driver already and there's no particular reason to deny it.

Regards, Daniel -- |: Red Hat, Engineering, London -o- http://people.redhat.com/berrange/:| |: http://libvirt.org -o- http://virt-manager.org -o- http://ovirt.org:| |: http://autobuild.org -o- http://search.cpan.org/~danberr/<http://search.cpan.org/%7Edanberr/>:| |: GnuPG: 7D3B9505 -o- F3C9 553F A1DA 4AC2 5648 23C1 B3DF F742 7D3B 9505 :|