Full System Emulation

QEMU has two operation modes, User Mode Emulation and Full system emulation.

In Full system emulation mode, QEMU emulates a full system (for example a PC), including one or several processors and various peripherals. It can be used to launch different Operating Systems without rebooting the PC or to debug system code.

 |~~~~~~~~~~~~~~~~~~~~~|
 |                     |
 |    Applications     |
 |                     |
 +---------------------+ 
 |                     |
 |      Kernel/OS      |
 |                     |
 +---------------------+  ^^^ QEMU full system emulation ^^^
 |                     |
 |       Hardware      | 
 | (CPU & Peripherals) |
 |                     |
 +---------------------+

Examples

Because Full System Emulation is the most common mode QEMU is used for, there are a lot of examples. Some examples where full system emulation is used:

Emulate one x86 system on another x86 system
Emulate an ARM system on an x86 system

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