On 28.06.2010, at 10:15, Avi Kivity wrote:

> On 06/28/2010 09:33 AM, Alexander Graf wrote:
>> 
>>> Could you do something similar in module_finalize() to patch loaded 
>>> modules' .text sections?
>>>     
>> I could, but do we need it? I objdump -d | grep'ed all my modules and didn't 
>> find any need to do so.
>>   
> 
> You mean even kvm.ko doesn't use privileged instructions?

It does, but I don't think it's worth speeding those up. There are only a 
couple. Most of the privileged instructions in PPC KVM are statically compiled 
into the kernel because we need to guarantee they're in the RMO (first 8MB for 
the PS3).

Even with the magic page in use, trapping instructions still works exactly as 
before, so we're only talking about a speed difference.


Alex

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