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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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