linux-kernel - Re: Merge Xen (the hypervisor) into Linux

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Message-ID: <4A263DD3.3090901@redhat.com>
Date:	Wed, 03 Jun 2009 11:09:39 +0200
From:	Gerd Hoffmann <kraxel@...hat.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
CC:	Theodore Tso <tytso@....edu>,
	Dan Magenheimer <dan.magenheimer@...cle.com>,
	Ingo Molnar <mingo@...e.hu>,
	Steven Rostedt <rostedt@...dmis.org>,
	George Dunlap <george.dunlap@...citrix.com>,
	David Miller <davem@...emloft.net>, jeremy@...p.org,
	avi@...hat.com, xen-devel@...ts.xensource.com, x86@...nel.org,
	linux-kernel@...r.kernel.org,
	Keir Fraser <Keir.Fraser@...citrix.com>,
	torvalds@...ux-foundation.org, gregkh@...e.de,
	kurt.hackel@...cle.com, Ian Pratt <Ian.Pratt@...citrix.com>,
	xen-users@...ts.xensource.com,
	ksrinivasan <ksrinivasan@...ell.com>, EAnderson@...ell.com,
	wimcoekaerts@...mekes.net,
	Stephen Spector <stephen.spector@...rix.com>,
	jens.axboe@...cle.com, npiggin@...e.de
Subject: Re: Merge Xen (the hypervisor) into Linux

On 06/03/09 10:47, Alan Cox wrote:
>> Linux is not the only player here.  NetBSD can run as dom0 guest.
>> Solaris can run as dom0 guest too.  Thus making the dom0/xen interface
>> private to linux and xen isn't going to fly.
>
> It does not however preclude fixing the dom0 interface.

It wasn't my intention to imply that.  The interface can be extended 
when needed.  PAT support will probably be such a case.  Changing it in 
incompatible ways isn't going to work though.

> MTRR, PAE etc can all be turned off for the purpose an initial merge.

s/PAE/PAT/?  PAE is mandatory ...

Having not-yet supported stuff disabled initially is sensible IMHO.  Can 
be done for MTRR and PAT.  Is already done for MSI ;)

The lapic/ioapic stuff must be sorted though because otherwise you can't 
boot the box at all.  I think the same is true for the swiotlb bits.

cheers,
   Gerd
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