kvm-kmod-2.6.33-rc6

The update queue for 2.6.33 is empty, so it's time to role out the first
kvm-kmod -rc package for this upcoming kernel. Find the list of KVM
enhancements below, but also the two feature reductions of kvm-kmod that this step required. However, they are not expected to cause any pain for
the vast majority of users.

The download is available at

https://sourceforge.net/projects/kvm/files/kvm-kmod/2.6.33-rc6/kvm-kmod-2.6.33-rc6.tar.bz2/download

Major KVM changes since kvm-kmod-2.6.32.7:
- improved kernel context switching speed
- better interoperation with other users of virtualization extensions
- improved irq scaling
- nested SVM improvements
- improved cpufreq integration
- spin loop detection on newer hardware
- adjustable paravirtual clock
- Xen PV-on-HVM guest support
- paravitual MMU is no longer advertised
- further improvements of x86 emulator

kvm-kmod changes:
- Drop workaround for !CONFIG_PREEMPT_NOTIFIERS for >= 2.6.33 (due to technical conflict, but upcoming distro kernels are likely shipping with CONFIG_KVM=m which enables them)
- Disable ioeventfd and irqfd for host kernels < 2.6.33 (no users expected + there is an unfixable race in older kernels)

Jan