linux-kernel - Re: [stable] [PATCH 00/12] xen/paravirt

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Date:	Mon, 15 Oct 2007 16:48:44 -0700
From:	Zachary Amsden <zach@...are.com>
To:	Andi Kleen <ak@...e.de>
Cc:	Jeremy Fitzhardinge <jeremy@...p.org>,
	xen-devel@...ts.xensource.com, Greg KH <greg@...ah.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Stable Kernel <stable@...nel.org>,
	Chris Wright <chrisw@...s-sol.org>,
	virtualization@...ts.osdl.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Keir Fraser <keir@...source.com>
Subject: Re: [stable] [PATCH 00/12] xen/paravirt_ops patches for 2.6.24

On Tue, 2007-10-16 at 00:03 +0200, Andi Kleen wrote:
> > Subject: [PATCH 12/12] xfs: eagerly remove vmap mappings to avoid
> > upsetting Xen
> 
> This should be probably done unconditionally because it's a undefined
> dangerous condition everywhere.

Should be done unconditionally.  One could remap the underlying physical
space to include an MMIO region, and speculative reads from the
cacheable virtual mapping of that region could move the robot arm,
destroying the world.

Zach

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