Ok here are my results: First I installed vista x86_64 on kvm-72. The installation went fine, and when it rebooted for the first time to complete the installation, it worked like a charm. After the installation, I shut down the vm and tried to launch it again. Result: doesn't boot (again, shows this screen with random characters and eats 100% cpu)
I tried to upgrade to kvm-79 from experimental, but still the same problem, although it looks a bit different. The resulting random-character screen looks different and it doesn't eat cpu at all while it shows it. (Notice: "random" is not really random... the screen is the same every time I try to boot it, but what I mean is that it just doesn't show something specific. I am attaching a screenshot....) Then I installed vista x86 on kvm-79. Again, the installation works, it reboots for the first time just fine and then it doesn't work. Same problem. It's strange, because with kvm-69 vista x86_64 was working perfectly... Too bad I can't find the kvm-69 .deb anymore :( PS: Note that I tried vista service pack 1, just in case it matters...
<<attachment: kvm-vista64.png>>