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qemu-doc.texi
| @@ -89,11 +89,17 @@ available: | @@ -89,11 +89,17 @@ available: | ||
| 89 | simulate the x86 MMU. It is @emph{fast} but has limitations because | 89 | simulate the x86 MMU. It is @emph{fast} but has limitations because |
| 90 | the whole 4 GB address space cannot be used and some memory mapped | 90 | the whole 4 GB address space cannot be used and some memory mapped |
| 91 | peripherials cannot be emulated accurately yet. Therefore, a specific | 91 | peripherials cannot be emulated accurately yet. Therefore, a specific |
| 92 | -guest Linux kernel can be used (@xref{linux_compile}) as guest OS. | 92 | +guest Linux kernel can be used (@xref{linux_compile}) as guest |
| 93 | +OS. | ||
| 94 | + | ||
| 95 | +Moreover there is no separation between the host and target address | ||
| 96 | +spaces, so it offers no security (the target OS can modify the | ||
| 97 | +@code{qemu-fast} code by writing at the right addresses). | ||
| 93 | 98 | ||
| 94 | @item | 99 | @item |
| 95 | -@code{qemu} uses a software MMU. It is about @emph{two times | ||
| 96 | -slower} but gives a more accurate emulation. | 100 | +@code{qemu} uses a software MMU. It is about @emph{two times slower} |
| 101 | +but gives a more accurate emulation and a complete separation between | ||
| 102 | +the host and target address spaces. | ||
| 97 | 103 | ||
| 98 | @end enumerate | 104 | @end enumerate |
| 99 | 105 |