Re: [PATCH] Use a table to dispatch IO requests in kvmctl

[Anthony Liguori <aliguori-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org>]

Avi Kivity wrote:
> Anthony Liguori wrote:
>> Avi Kivity wrote:
>>> Anthony Liguori wrote:
>>>  
>>>> This patch attempts to clean up kvmctl so that it can be more 
>>>> easily made to
>>>> work for multiple architectures and to support more emulation.
>>>>
>>>> It introduces a io dispatch mechanism.  This mechanism supports 
>>>> subpage
>>>> granularity but is optimized to efficiently cover regions of pages 
>>>> too.  It's
>>>> a 64-bit address space that's structured as a 5-level table.
>>>>       
>>>
>>>
>>> Why not use a simple array?
>>>   
>>
>> For MMIO too?
>
> Yes.
>
>>
>> QEMU uses an array for PIO but a table for MMIO.  I figured it would 
>> be best to just use the same table.
>
> Or the same array?

Indexed by the address or just sorted and searchable?  MMIO addresses 
are rather sparse so the former seems like the only sane thing.  It also 
has to support subpage granularity.

Regards,

Anthony Liguori


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