linux-kernel - Re: [PATCH] xen: core dom0 support

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Message-ID: <49ABD05C.3010906@redhat.com>
Date:	Mon, 02 Mar 2009 13:26:04 +0100
From:	Gerd Hoffmann <kraxel@...hat.com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Jeremy Fitzhardinge <jeremy@...p.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	the arch/x86 maintainers <x86@...nel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Xen-devel <xen-devel@...ts.xensource.com>
Subject: Re: [PATCH] xen: core dom0 support

Ingo Molnar wrote:
> * Gerd Hoffmann <kraxel@...hat.com> wrote:
>> The current, out-of-tree xen kernel stuff is based on 2.6.18. 
>> [...]
> 
> Sure, but what i'm pointing out is the following aspect of 
> communication:
> 
>>>> [...] At the moment its all running on massive out-of-tree 
>>>> patches, which doesn't make anyone happy.  It's best that it 
>>>> be in the mainline kernel.  You know, like we argue for 
>>>> everything else.
> 
> Comparing it to a 2.6.18 base is simply misleading when it comes 
> to upstreaming something. Enterprise distros will rebase, and 
> their out-of-tree pile of patches will shrink.

I think Jeremy refers to the 2.6.18 kernel though.  And IMHO it isn't
misleading as this is the only option for a dom0 kernel.  Well, was
until very recently, now you can also run the latest pv_ops bits with
dom0 support.  That is still very young code though and I wouldn't use
that (yet) for production systems.  Works fine on my development box though.

The bits needed for pv_ops based dom0 support in arch/x86 is small
compared to what is already there for domU support.

cheers,
  Gerd
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