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

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Message-ID: <4A032390.6030100@gmail.com>
Date:	Thu, 07 May 2009 14:08:16 -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:
>> I completed the resurrection of the test and wrote up a little wiki on
>> the subject, which you can find here:
>>
>> http://developer.novell.com/wiki/index.php/WhyHypercalls
>>
>> Hopefully this answers Chris' "show me the numbers" and Anthony's "Why
>> reinvent the wheel?" questions.
>>
>> I will include this information when I publish the updated v2 series
>> with the s/hypercall/dynhc changes.
>>
>> Let me know if you have any questions.
>>   
>
> Well, 420 ns is not to be sneezed at.
>
> What do you think of my mmio hypercall?  That will speed up all mmio
> to be as fast as a hypercall, and then we can use ordinary mmio/pio
> writes to trigger things.
>
I like it!

Bigger question is what kind of work goes into making mmio a pv_op (or
is this already done)?

-Greg


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