linux-kernel - Re: [PATCH] Add I/O hypercalls for i386 paravirt

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Date:	Thu, 23 Aug 2007 15:34:56 +1000
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	Andi Kleen <ak@...e.de>, Zachary Amsden <zach@...are.com>,
	Andrew Morton <akpm@...l.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Virtualization Mailing List <virtualization@...ts.osdl.org>,
	Chris Wright <chrisw@...s-sol.org>,
	Avi Kivity <avi@...ranet.com>,
	Jeremy Fitzhardinge <jeremy@...p.org>
Subject: Re: [PATCH] Add I/O hypercalls for i386 paravirt

On Wed, 2007-08-22 at 22:25 +0100, Alan Cox wrote:
> > I still think it's preferable to change some drivers than everybody.
> > 
> > AFAIK BusLogic as real hardware is pretty much dead anyways,
> > so you're probably the only primary user of it anyways.
> > Go wild on it!
> 
> I don't believe anyone is materially maintaining the buslogic driver and
> in time its going to break completely.
> 
> > Well that might be. I just think it would be a mistake
> > to design paravirt_ops based on someone's short term release engineering
> > considerations.
> 
> Agreed, especially as an interface where each in or out traps into the
> hypervisor is broken even for the model of virtualising hardware. 

I'd really like lguest guests not to do ins and outs, but that's likely
to be more invasive a change than this.  We do it to find the PCI bus
IIRC, and a couple of other early probe bits.

It's just unfortunate that it's the one place lguest has to emulate
because of lack of paravirt_ops coverage.

Rusty.

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