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

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Message-ID: <4A033281.8050002@novell.com>
Date:	Thu, 07 May 2009 15:12:01 -0400
From:	Gregory Haskins <ghaskins@...ell.com>
To:	Chris Wright <chrisw@...s-sol.org>
CC:	Avi Kivity <avi@...hat.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:
> * 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?

-Greg


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