KVM-86 not exposing 64 bits CPU anymore, NICE

[Gilles PIETRI <contact+dev@gilouweb.com>]

Hi,

I'm quite pissed off. I just upgraded to kvm-86 on a host that has 
worked nicely on kvm-78 for quite some time. But since I was fearing the 
qcow2 corruption issues, I wanted to upgrade kvm-86. After testing the 
performance, I decided to switch. How stupid that was. That was really 
putting too much trust in KVM.

Now I can't have 64 bits CPUs on my guests.
My host is running a 2.6.27.7 kernel, and is x86_64 enabled.
Until the upgrade, guests were running x86_64 fine.
Now, it says long mode can't be used or something like that, and I can 
only have 32 bits guests.

Looks really like the bug explained here: 
http://www.mail-archive.com/kvm@vger.kernel.org/msg09431.html

If I use -no-kvm, it works, but obviously, I want to be able to have kvm 
support enabled.

Now, I really am happy about this upgrade, and I'm gonna have to roll it 
back. I really would appreciate some help on this..

Gilles