this patch discards MSR writes to the Performance Event-Select 
Registers, this is the first issue why vista seems to fail although now 
vista ends up in an endless loop a bit later.
Qemu currently also discards those writes.

Signed-off-by: Joerg Roedel <joerg.roedel-5C7GfCeVMHo@public.gmane.org>
Signed-off-by: Markus Rechberger <markus.rechberger-5C7GfCeVMHo@public.gmane.org>