Added ' args: -cpu kvm64 ' to VM's conf file and networking is operational again. Options in ps output look rather strange now: ..... -cpu kvm64,+x2apic,+sep -k en-us -m 2048 -cpuunits 1000 -cpu kvm64 ..... but it works.
Hi, last proxmox update include a new "solaris" ostype, no more trick needed
http://forum.proxmox.com/threads/16191-New-Kernel-for-Proxmox-VE-3-1-and-bug-fixes