KVM extra features

[fwsGonzo]

https://www.kernel.org/doc/Documentation/virtual/kvm/cpuid.txt I'm currently implementing paravirtualized EOI now.

Also some interesting info here on detecting sandboxes: https://github.com/a0rtega/pafish/blob/master/pafish/cpu.c

Some KVM-only features, such as clocksource: https://www.kernel.org/doc/Documentation/virtual/kvm/cpuid.txt

[fwsGonzo]

PV-EOI simply won't activate even with x2APIC enabled. Something in qemu is not turning the feature on during startup, but the feature is still shown as present, and it can even be enabled. It could simply be broken for 32-bit. Shame, because it's such a necessary feature.