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

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Message-ID: <20090507192145.GF3036@sequoia.sous-sol.org>
Date:	Thu, 7 May 2009 12:21:45 -0700
From:	Chris Wright <chrisw@...s-sol.org>
To:	Gregory Haskins <ghaskins@...ell.com>
Cc:	Chris Wright <chrisw@...s-sol.org>, 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

* 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).
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