From 3eb2619fe55aa7b040aba4fbf9242c50d0a9672e Mon Sep 17 00:00:00 2001 From: bellard Date: Wed, 14 Jul 2004 19:20:07 +0000 Subject: [PATCH] update git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@1029 c046a42c-6fe2-441c-8c8c-71466251a162 --- qemu-doc.texi | 12 +++++++++--- 1 file 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