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| -rw-r--r-- | qemu-doc.texi | 12 |
1 files changed, 9 insertions, 3 deletions
diff --git a/qemu-doc.texi b/qemu-doc.texi index e74e793edb..d3c0a1625b 100644 --- a/qemu-doc.texi +++ b/qemu-doc.texi @@ -89,11 +89,17 @@ available: 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 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 -@code{qemu} uses a software MMU. It is about @emph{two times -slower} but gives a more accurate emulation. +@code{qemu} uses a software MMU. It is about @emph{two times slower} +but gives a more accurate emulation and a complete separation between +the host and target address spaces. @end enumerate |