On Linux you can use KVM, and this is the oldest and best tested of the 'use the host CPU's hardware virtualization. The QEMU command line option '-accel help' will tell you which ones have been compiled into a particular QEMU binary, and you can use '-accel name-of-accelerator' to enable the one you want.
QEMU can also do emulation for user-level. QEMU is a free and open-source hypervisor.It emulates the machine's processor through dynamic binary translation and provides a set of different hardware and device models for the machine, enabling it to run a variety of guest operating systems.It could interoperate with Kernel-based Virtual Machine (KVM) to run virtual machines at near-native speed.
