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

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Message-ID: <45D61C74.2000601@vmware.com>
Date:	Fri, 16 Feb 2007 13:04:52 -0800
From:	Zachary Amsden <zach@...are.com>
To:	Christoph Lameter <clameter@....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>
Subject: Re: [patch 00/21] Xen-paravirt: Xen guest implementation for paravirt_ops
 interface

Christoph Lameter wrote:
> On Thu, 15 Feb 2007, Jeremy Fitzhardinge wrote:
>
>   
>> This patch series implements the Linux Xen guest in terms of the
>> paravirt-ops interface.  The features in implemented this patch series
>>     
>
> I am thoroughly confused. Maybe that is because I have not been following 
> this issue closely but it seems that you are using the paravirt interface 
> as an API for Xen code in the guest? I thought the idea of paravirt was to 
> have an API that is generic? This patchset seems to be mostly realizing 
> Xen specific functionality? How does the code here interact with KVM, 
> VMWare and other hypervisors?
>   

For the most part, it doesn't disturb VMware or KVM.  Xen does need some 
additional functionality in paravirt-ops because they took a different 
design choice - direct page tables instead of shadow page tables.  This 
is where all the requirements for the new Xen paravirt-ops hooks come from.

Zach
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