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

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Message-ID: <4A033101.8050106@gmail.com>
Date:	Thu, 07 May 2009 15:05:37 -0400
From:	Gregory Haskins <gregory.haskins@...il.com>
To:	Avi Kivity <avi@...hat.com>
CC:	Gregory Haskins <ghaskins@...ell.com>,
	Chris Wright <chrisw@...s-sol.org>,
	linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
	Anthony Liguori <anthony@...emonkey.ws>
Subject: Re: [RFC PATCH 0/3] generic hypercall support

Avi Kivity wrote:
> Gregory Haskins wrote:
>> Avi Kivity wrote:
>>  
>>> Gregory Haskins wrote:
>>>    
>>>> I guess technically mmio can just be a simple access of the page which
>>>> would be problematic to trap locally without a PF.  However it seems
>>>> that most mmio always passes through a ioread()/iowrite() call so this
>>>> is perhaps the hook point.  If we set the stake in the ground that
>>>> mmios
>>>> that go through some other mechanism like PFs can just hit the "slow
>>>> path" are an acceptable casualty, I think we can make that work.
>>>>         
>>> That's my thinking exactly.
>>>     
>>
>> 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.
>
Ah.  Crap.

Would you be conducive if I continue along with the dynhc() approach then?

-Greg


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