Re: [PATCH] Replace kvm io delay pv-ops with linux magic

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On 20.11.2009, at 02:54, Jeremy Fitzhardinge wrote:

> On 11/20/09 07:58, Alexander Graf wrote:
>>
>> Am 19.11.2009 um 23:55 schrieb Jeremy Fitzhardinge <jeremy@xxxxxxxx>:
>>
>>> On 11/18/09 20:56, Alexander Graf wrote:
>>>> Currently we use pv-ops to tell linux not to do anything on  
>>>> io_delay.
>>>>
>>>> While the basic idea is good IMHO, I don't see why we would need  
>>>> pv-ops
>>>> for that. The io delay function already has a switch that can do
>>>> nothing
>>>> if you're so inclined.
>>>>
>>>> So here's a patch (stacked on top of the previous pv-ops series)  
>>>> that
>>>> removes the io delay pv-ops hook and just sets the native io delay
>>>> variable instead.
>>>>
>>>
>>> Can you just get rid of the io_delay op altogether?  If KVM  
>>> doesn't need
>>> it, then nobody does.
>>
>> Sure, can do. That'd be a separate patch though.
>
> Yep.  A patch each for VMI and Xen to remove the dependency, and a  
> final
> patch to remove the op.  Hm, looks like VMI has a specific ROM call  
> for
> io_delay; I wonder what it does.

Oh so it's actually using it? Feel like doing the removal then? I  
don't really want to mess with VMI code :-)

Alex
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