linux-kernel - Re: [PATCH 1/10] lguest: Don't rely on last-linked fallthru when no paravirt handler

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Message-ID: <45CCDE42.2050603@goop.org>
Date:	Fri, 09 Feb 2007 12:49:06 -0800
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Rusty Russell <rusty@...tcorp.com.au>
CC:	Andi Kleen <ak@....de>, virtualization@...ts.osdl.org,
	lkml - Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...l.org>,
	Jeremy Fitzhardinge <jeremy@...source.com>
Subject: Re: [PATCH 1/10] lguest: Don't rely on last-linked fallthru when
 no paravirt handler

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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