The Intel Hardware Accelerated Execution Manager provides hardware-assisted virtualization. It should (hopefully) work the same with more recent versions of the Android emulator. Use the Android SDK Manager to download the KitKat x86 emulator.
Here's a more recent Intel document: http://software.intel.com/en-us/android/articles/speeding-up-the-android-emulator-on-intel-architecture
and Google's documentation: http://developer.android.com/tools/devices/emulator.html
Do follow those instructions.
If it still doesn't work for you, there are many possible causes such as: not having an Intel CPU, not installed properly, need to set BIOS settings, need to reboot, need to allocate lots of memory to HAXM, need to keep the AVD memory size down, attempting to configure the emulator to use the host GPU, ...
What are the specific symptoms? Do try searching for them on Google.
Also search for Hardware Accelerated Execution Manager linux for more documentation and experience reports.