Re: [Qemu-devel] Re: [PATCH v2] qemu-kvm: Speed up of the dirty-bitmap-traveling

[Avi Kivity]

On 02/10/2010 06:47 PM, Alexander Graf wrote:
>>> Because on PPC, you usually run PPC32 userspace code on a PPC64 kernel.
>>> Unlike with x86, there's no real benefit in using 64 bit userspace.
>>>   
>>>     
>>>       
>> btw, does 32-bit ppc qemu support large memory guests? It doesn't on
>> x86, and I don't remember any hacks to support large memory guests
>> elsewhere.
>>   
>>     
>
> It doesn't :-). In fact, the guest we virtualize wouldn't work with > 2
> GB anyways, because that needs an iommu implementation.
>   

Oh, so you may want to revisit the "there's no real benefit in using 64
bit userspace".

Seriously, that looks like a big deficiency. What would it take to
implement an iommu?

I imagine Anthony's latest patches are a first step in that journey.

-- 
error compiling committee.c: too many arguments to function