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

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Message-ID: <4A0322F1.2000905@redhat.com>
Date:	Thu, 07 May 2009 21:05:37 +0300
From:	Avi Kivity <avi@...hat.com>
To:	Gregory Haskins <ghaskins@...ell.com>
CC:	Chris Wright <chrisw@...s-sol.org>,
	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

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 have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.

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