Re: [Qemu-devel] x86-64 port

[Fabrice Bellard <fabrice@bellard.org>]

Gwenole Beauchesne wrote:
> Hi,
> 
>> 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.

Sorry - I should have merged it before ! If you can generate a new patch 
against the current CVS I'll merge it (if you don't have time I can 
begin to look at it - I am looking now at the version you posted). If 
the user mode is working, most of the work is done.

>> 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.

OK. So this is even better for QEMU :-)

Fabrice.