[PVE-User] Proxmox 3.0 - unable to run pfSense

[Lex Rivera]

Hello. 
I recently upgraded one of lab machines to Proxmox 3.0 and found out
that it can't run pfsense anymore.
ATM i solved it by extracting bios from pve-qemu-kvm-1.3.0, setting path
to that bios via -bios in VM .conf, and disabling KVM hardware
virtualization. That way it works.
With recent PVE and default settings booting just hangs (no kernel
trace) babbling something about being unable to allocate IRQ.