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

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Date:	Wed, 22 Aug 2007 22:25:28 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Andi Kleen <ak@...e.de>
Cc:	Zachary Amsden <zach@...are.com>, Andi Kleen <ak@...e.de>,
	Andrew Morton <akpm@...l.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Virtualization Mailing List <virtualization@...ts.osdl.org>,
	Rusty Russell <rusty@...tcorp.com.au>,
	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

> 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 thought we had that already?  But can't find it now :/

pci_iomap() and friends. 

Alan
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