linux-kernel - Re: [patch 00/21] Xen-paravirt: Xen guest implementation for paravirt

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Message-ID: <Pine.LNX.4.64.0702161356380.29218@schroedinger.engr.sgi.com>
Date:	Fri, 16 Feb 2007 13:59:44 -0800 (PST)
From:	Christoph Lameter <clameter@....com>
To:	Zachary Amsden <zach@...are.com>
cc:	Jeremy Fitzhardinge <jeremy@...p.org>, Andi Kleen <ak@....de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, virtualization@...ts.osdl.org,
	xen-devel@...ts.xensource.com, Chris Wright <chrisw@...s-sol.org>,
	Rusty Russell <rusty@...tcorp.com.au>
Subject: Re: [patch 00/21] Xen-paravirt: Xen guest implementation for
 paravirt_ops interface

On Fri, 16 Feb 2007, Zachary Amsden wrote:

> Yes, but that is just because the Xen hooks happens to be near the last part
> of the merge.  VMI required some special hooks, as do both Xen and lhype (I
> think ... Rusty can correct me if lhype's puppy's have precluded the addition
> of new hooks).  Xen page table handling is very different, mostly it is trap
> and emulate so writable page tables can work, which means they don't always
> issue hypercalls for PTE updates, although they do have that option, should
> the hypervisor MMU model change, or performance concerns prompt a different
> model (or perhaps, migration?)

Well looks like there are still some major design issues to be ironed out. 
What is proposed here is to make paravirt_ops a fake generic 
API and then tunnel through it to vendor specific kernel mods.

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