linux-kernel - Re: [RFC PATCH 0/3] generic hypercall support

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Message-ID: <4A0335CB.5010408@redhat.com>
Date:	Thu, 07 May 2009 22:26:03 +0300
From:	Avi Kivity <avi@...hat.com>
To:	Chris Wright <chrisw@...s-sol.org>
CC:	Gregory Haskins <ghaskins@...ell.com>,
	Gregory Haskins <gregory.haskins@...il.com>,
	linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
	Anthony Liguori <anthony@...emonkey.ws>
Subject: Re: [RFC PATCH 0/3] generic hypercall support

Chris Wright wrote:
> * Gregory Haskins (ghaskins@...ell.com) wrote:
>   
>> Chris Wright wrote:
>>     
>>> * Avi Kivity (avi@...hat.com) wrote:
>>>       
>>>> Gregory Haskins wrote:
>>>>         
>>>>> Cool,  I will code this up and submit it.  While Im at it, Ill run it
>>>>> through the "nullio" ringer, too. ;)  It would be cool to see the
>>>>> pv-mmio hit that 2.07us number.  I can't think of any reason why this
>>>>> will not be the case.
>>>>>       
>>>>>           
>>>> Don't - it's broken.  It will also catch device assignment mmio and  
>>>> hypercall them.
>>>>         
>>> Not necessarily.  It just needs to be creative w/ IO_COND
>>>       
>> Hi Chris,
>>    Could you elaborate?  How would you know which pages to hypercall and
>> which to let PF?
>>     
>
> Was just thinking of some ugly mangling of the addr (I'm not entirely
> sure what would work best).
>   

I think we just past the "too complicated" threshold.

-- 
Do not meddle in the internals of kernels, for they are subtle and quick to panic.

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