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Re: [Qemu-devel] x86-64 port

From: Gwenole Beauchesne
Subject: Re: [Qemu-devel] x86-64 port
Date: Wed, 17 Mar 2004 23:17:06 +0100


Nick Snellock wrote:
Is anyone working on an x86-64 port?

Not me :-) An x86-64 host port would be very interesting because the 64 bit host MMU could be used to remap the whole emulated 4GB address space.

Fabrice, remember that I posted AMD64 support bits to the list some time ago? ;-) This works for user mode applications. As for the soft mmu, the current code is not 64-bit clean. I had some patches but they were not enough and are in a dormant state since. So remapping the whole 4GB address space is probably a faster and simpler fix indeed.

I think that there is also a lot of potential for a "code-copy" mode converting x86-32 to x86-64 code (look at what I did for . Along with the 4GB space remapping, it would give close to native performances without requiring any potentially unsafe kernel module (unlike the popular virtualizers).

The popular virtualizers don't officially support AMD64 host systems yet. Vmware 4.5 is expected to do so though.

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