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simulate the x86 MMU. It is @emph{fast} but has limitations because
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the whole 4 GB address space cannot be used and some memory mapped
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peripherials cannot be emulated accurately yet. Therefore, a specific
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guest Linux kernel can be used (@xref{linux_compile}) as guest OS.
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guest Linux kernel can be used (@xref{linux_compile}) as guest
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OS.
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Moreover there is no separation between the host and target address


  		





  
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spaces, so it offers no security (the target OS can modify the


  		





  
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@code{qemu-fast} code by writing at the right addresses).


  		





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@item 


  		





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@code{qemu} uses a software MMU. It is about @emph{two times 


  		





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slower} but gives a more accurate emulation. 


  		





  
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@code{qemu} uses a software MMU. It is about @emph{two times slower}


  		





  
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but gives a more accurate emulation and a complete separation between


  		





  
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the host and target address spaces.


  		





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@end enumerate


  		





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