linux-kernel - Re: [PATCH UPDATE] x86: ignore spurious faults

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Message-Id: <200801251938.39231.nickpiggin@yahoo.com.au>
Date:	Fri, 25 Jan 2008 19:38:38 +1100
From:	Nick Piggin <nickpiggin@...oo.com.au>
To:	"Jan Beulich" <jbeulich@...ell.com>
Cc:	"Keir Fraser" <Keir.Fraser@...cam.ac.uk>,
	"Jeremy Fitzhardinge" <jeremy@...p.org>,
	"Ingo Molnar" <mingo@...e.hu>,
	"Harvey Harrison" <harvey.harrison@...il.com>,
	"Matt Mackall" <mpm@...enic.com>, "Andi Kleen" <ak@...e.de>,
	"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH UPDATE] x86: ignore spurious faults

On Friday 25 January 2008 19:15, Jan Beulich wrote:
> Actually, another thought: permitting (and handling) spurious faults for
> kernel mappings conflicts with NMI handling, i.e. great care would be
> needed to ensure the NMI path cannot touch any such mapping. So
> even the present Xen/Linux Dom0 implementation may have some
> (perhaps unlikely) problems here, and it would get worse if we added
> e.g. a virtual watchdog NMI (something I am considering, which would
> then extend the problem to DomU-s).

Can you explain how they conflict?

Thanks,
Nick
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