virtual SME 8.1 64bit Kernel panic - not syncing: IO-APIC + timer doesn't work!

I just had this happen with a recent update in SME (which didn't resolve all dependancies for some reason).I was originally using the CPU qemu64, but when I got this error, I changed the CPU to kvm64.I am using dual E5520, and for most of my KVM's I have to set CPU to Nehalm, but it seems that may not have been the right thing to do.Whatever the case, my SME is up and running. I just need to find the purpose and understand the reasoning behind the other CPU types.