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Re: [Xen-devel] RFC: [0/2] Remove netloop by lazy copying in netback

To: Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>
Subject: Re: [Xen-devel] RFC: [0/2] Remove netloop by lazy copying in netback
From: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
Date: Tue, 20 Mar 2007 21:11:40 +1100
Cc: Xen Development Mailing List <xen-devel@xxxxxxxxxxxxxxxxxxx>, Keir Fraser <keir@xxxxxxxxxxxxx>
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On Tue, Mar 20, 2007 at 07:10:27AM +0000, Keir Fraser wrote:
> Sounds good. I'm not sure about putting this in for 3.0.5 since that's only
> a couple of weeks away. Also I'm loathe to add yet another darned
> grant-table operation if we can avoid it. In this case I have my doubts it's
> required, if we're prepared to hook off a slow path in the page-fault
> handler (unhandled kernel fault). If we could get a callback into netback in
> that case for some range of kernel virtual addresses then we could fix up

Yes that's a good idea and would avoid the grant table addition.

My only concern would be future acceptance into the mainstream
Linux kernel, especially on the domU side since I'd like to see
this idea used for dom0 => domU as well.

However, I'm certainly happy to explore doing it in the way you

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