Win7 Guest Host CPU ?

Hi, thanks for the info.
I found a recent patch on kvm 1.1 rc4
Expose CPUID leaf 7 only for -cpu host (Eduardo Habkost)
https://lists.gnu.org/archive/html/qemu-devel/2012-05/msg02351.html

seem to be related.
Not sure, But i'm think it's limiting leaf to 7 if kernel don't support it.

proxmox testing repo is at 1.1 rc-3, but rc-4 is coming soon, so maybe can you try to test it when it will be release ?