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git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@1029 c046a42c-6fe2-441c-8c8c-71466251a162
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bellard 2004-07-14 19:20:07 +00:00
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qemu-doc.texi
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@ -89,11 +89,17 @@ available:
simulate the x86 MMU. It is @emph{fast} but has limitations because simulate the x86 MMU. It is @emph{fast} but has limitations because
the whole 4 GB address space cannot be used and some memory mapped the whole 4 GB address space cannot be used and some memory mapped
peripherials cannot be emulated accurately yet. Therefore, a specific peripherials cannot be emulated accurately yet. Therefore, a specific
guest Linux kernel can be used (@xref{linux_compile}) as guest OS. guest Linux kernel can be used (@xref{linux_compile}) as guest
OS.
Moreover there is no separation between the host and target address
spaces, so it offers no security (the target OS can modify the
@code{qemu-fast} code by writing at the right addresses).
@item @item
@code{qemu} uses a software MMU. It is about @emph{two times @code{qemu} uses a software MMU. It is about @emph{two times slower}
slower} but gives a more accurate emulation. but gives a more accurate emulation and a complete separation between
the host and target address spaces.
@end enumerate @end enumerate