Hi Renzo
The patch seems to work for multicast interface between multiple VM.
vmlinux mem=128M eth0=mcast,,239.0.1.1
...
Configured mcast device: 239.0.1.1:1102-1
Choosing a random ethernet address for device eth0
Netdevice 0 (d6:26:50:fd:f8:ef) : mcast backend multicast address:
239.0.1.1:1102,
User-Mode Linux 2.6.29-rc* gives a lot of warnings during the boot:
IRQ 2/console: IRQF_DISABLED is not guaranteed on shared IRQs
IRQ 3/console-write: IRQF_DISABLED is not guaranteed on shared IRQs
IRQ 5/eth0: IRQF_DISABLED is not guaranteed on shared IRQs
IRQ 6/ssl: IRQF_DISABLED is not guarantee
