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[Qemu-devel] QVM86, SKAS.. many modules, one vision?
From: |
Ian Rogers |
Subject: |
[Qemu-devel] QVM86, SKAS.. many modules, one vision? |
Date: |
Mon, 09 May 2005 10:09:35 +0100 |
User-agent: |
Mozilla Thunderbird 0.8 (X11/20040913) |
Hi,
I recently spent some effort working out what Separate Kernel Address
Space (SKAS) did for user-mode-linux (UML). The results of this keen be
seen here:
http://news.gmane.org/group/gmane.linux.uml.devel/last=/force_load=t
on the thread "Using SKAS, any examples?"
the conclusion to this is that with SKAS you can create separate address
spaces and map pages (possibly shared) into them. You can then use
ptrace to control the execution of something in that separate address space.
This is all well and good, but when emulating one instruction set on
another the executing code needs to peek and poke the separate address
space. With SKAS this can only be done by using a page with a shared
mapping, or by executing some host machine code in the separate address
space.
What would be good is if multi-segments could be enabled and then
cs/ds/es could be used by the emulator and fs/gs could map to higher in
the linear address space and onto the separate address spaces. These
address spaces would then be addressable with just a segment over-ride.
It seems these goals are likely in part to be shared by qvm86 and kqemu.
Is it worth working toward a unified Linux module specifically for
emulation?
Regards,
Ian Rogers
- http://www.cs.manchester.ac.uk/apt/projects/jamaica
- http://www.binarytranslator.org/
- [Qemu-devel] QVM86, SKAS.. many modules, one vision?,
Ian Rogers <=