For using KQEmu, you processor must have the VT (for Intel processors) or the AMD-V (obviously, for AMD processor) instruction set to work properly. If you got one of these two technologies, you may enable the KQEmu by loading the KVM kernel's module:
And now, you may start QEmu again without seeing the error message.
If you don't have processor with any of these two instructions set, you may still using QEmu, but with little performance. And the message you continue to show every time you start QEmu.