Message-ID: <45CCDE42.2050603@goop.org>
Date: Fri, 09 Feb 2007 12:49:06 -0800
From: Jeremy Fitzhardinge <jeremy@goop.org>
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To: Rusty Russell <rusty@rustcorp.com.au>
CC: Andi Kleen <ak@muc.de>, virtualization@lists.osdl.org,
       lkml - Kernel Mailing List <linux-kernel@vger.kernel.org>,
       Andrew Morton <akpm@osdl.org>,
       Jeremy Fitzhardinge <jeremy@xensource.com>
Subject: Re: [PATCH 1/10] lguest: Don't rely on last-linked fallthru when
 no paravirt handler
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Rusty Russell wrote:
> If we make it thought early_fault, this will do just that.
>
> Given this is a "never happens" situation, however... if you're actually
> under Xen or lguest, you won't make it that far (lguest, at least, will
> kill you on the cr2 load in early_fault, but it doesn't matter because
> we won't get anywhere with early_printk anyway).
>
> Actually, if we did BUG() here at least lguest would print something...
> I wonder what Xen would do...

Xen would print a complete register dump and backtrace.  There's not a
lot else you can do here; you could try early_printk, but if we're in a
strange virtual environment, there may be no device on which the output
could appear.

    J

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