> How many of these 500,000 servers running Xen can't run KVM? And aren't those on a schedule to be retired, for other reasons (e.g. power consumption, increasing failure rate, etc.) soon?
When I bought my laptop, January 2008, I shopped explicitly for one with virtualization capability. However, for a long time I just was not able to use it as such - Because of the lack of support in Xen for core features I want a laptop to support, such as ACPI (which is mainly useful for laptops, granted, but that could be very well used everywhere, leading to sensible power savings). Virtualization does not only work at the server farm, it can also be very useful at desktops.