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From: Rusty Russell <rusty@rustcorp.com.au>
To: "H. Peter Anvin" <hpa@zytor.com>
Subject: Re: [BUG] broken ebba638ae723d8a8fc2f7abce5ec18b688b791d7
Date: Thu, 3 Feb 2011 12:30:13 +1030
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Cc: Jeremy Fitzhardinge <jeremy@goop.org>, Kees Cook <kees.cook@canonical.com>,
        matthieu castet <castet.matthieu@free.fr>,
        Linux Kernel list <linux-kernel@vger.kernel.org>,
        Ingo Molnar <mingo@elte.hu>
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On Thu, 3 Feb 2011 11:49:36 am Rusty Russell wrote:
> On Thu, 3 Feb 2011 09:18:21 am H. Peter Anvin wrote:
> > On 01/28/2011 08:58 AM, Jeremy Fitzhardinge wrote:
> > > On 01/27/2011 07:38 PM, H. Peter Anvin wrote:
> > >> [Adding Jeremy]
> > >>
> > >> Jeremy, would this break Xen?  As far as I know, Xen is the main user
> > >> of skipping segment register initialization.
> > > 
> > > Xen doesn't go through head_*.S at all.
> > > 
> > 
> > OK, I guess it's actually lguest which needs this feature?
> 
> Well, we already move __BOOT_DS into every other segment reg, so I don't think
> %ss will break...
> 
> Checking...

Fine here.

Thanks,
Rusty.
PS.  In general, I don't want lguest to interfere with cleanups: I'd rather
     fix up lguest as required until it gets too hard, then kill it.