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Re: [Qemu-devel] The QEMU Accelerator Module
From: |
Jim C. Brown |
Subject: |
Re: [Qemu-devel] The QEMU Accelerator Module |
Date: |
Fri, 11 Feb 2005 12:17:16 -0500 |
User-agent: |
Mutt/1.4i |
On Fri, Feb 11, 2005 at 04:09:10PM +0000, Derek Fawcus wrote:
> Well,
> rather than whinging because Fabrice has not chosen to distribute his
> work under your preferred licence. People could simply reimplement it.
Or do as I am, and figure out how to mix plex86 with the open source part.
Or even better, dig deep in your pockets and sponser Fabrice to completely
open it up.
>
> Mind - this involves effort on their behalf, and some thinking. So it's
> certainly easier to moan. However I suggest that such moaning is simply
> a waste of time and effort.
>
> Now I don't know how Fabrice has done the kqemu module, but the obvious
> approach that springs to mind is simply moving the qemu-fast processing
> into the kernel with checks for the address boundary. So if I was to
> attempt to reimplement it, my starting point would be to approach it
> in that fashion.
>
> Namely placing a version of cpu_exec() and/or main_loop() into the kernel
> together with the use of the USE_CODE_COPY facility and some bounds checks
> such that if the machine being emulated attempted to have accessable memory
> above 0xc0000000 it would fall back to the user-space SOFT_MMU emulation.
> One could then manipulate the process space such that while the kernel
> module was running user space code, it's process address space (< 0xc0000000)
> reflected the emulated machine space.
That wouldn't be complete, as kqemu uses virtalization as well. Also, it seems
that a lot of the kernel MMU support is in the open source code. Only
kqemu_delete, kqemu_exec, kqemu_get_cpu_state, and kqemu_init need to be
reimplemented.
--
Infinite complexity begets infinite beauty.
Infinite precision begets infinite perfection.
- [Qemu-devel] KQemu logic and marketing goals, (continued)
- [Qemu-devel] KQemu logic and marketing goals, Jean-Michel POURE, 2005/02/11
- Re: [Qemu-devel] KQemu logic and marketing goals, Lionel Ulmer, 2005/02/11
- Re: [Qemu-devel] KQemu logic and marketing goals, Julian Seward, 2005/02/11
- Re: [Qemu-devel] KQemu logic and marketing goals, Lennert Buytenhek, 2005/02/11
- Re: [Qemu-devel] KQemu logic and marketing goals, Johannes Schindelin, 2005/02/11
- Re: [Qemu-devel] KQemu logic and marketing goals, Lennert Buytenhek, 2005/02/11
- Re: [Qemu-devel] KQemu logic and marketing goals, Jean-Michel POURE, 2005/02/11
Re: [Qemu-devel] The QEMU Accelerator Module, Johannes Schindelin, 2005/02/11
Re: [Qemu-devel] The QEMU Accelerator Module, Derek Fawcus, 2005/02/11
- Re: [Qemu-devel] The QEMU Accelerator Module,
Jim C. Brown <=
[Qemu-devel] Re: The QEMU Accelerator Module, Alexander E. Patrakov, 2005/02/11
[Qemu-devel] Re: The QEMU Accelerator Module, Anand Kumria, 2005/02/11
- Re: [Qemu-devel] Re: The QEMU Accelerator Module, Antti-Juhani Kaijanaho, 2005/02/11
- Re: [Qemu-devel] Re: The QEMU Accelerator Module, Johannes Schindelin, 2005/02/11
- [Qemu-devel] Re: Re: The QEMU Accelerator Module, Anand Kumria, 2005/02/12
- Re: [Qemu-devel] Re: Re: The QEMU Accelerator Module, Natalia Portillo, 2005/02/12
- Re: [Qemu-devel] Re: Re: The QEMU Accelerator Module, Jean-Christian de Rivaz, 2005/02/12
- Re: [Qemu-devel] Re: Re: The QEMU Accelerator Module, René Korthaus, 2005/02/12