Re: [Xen-devel] [PATCH] x86/setup: don't relocate the VGA hole

[Ian Campbell <ian.campbell@xxxxxxxxxx>]

On Thu, 2013-02-07 at 21:38 +0000, Keir Fraser wrote:

> > The poisoning was to protect against stray pointers out of the low 1MB
> > region? I assumed it was against pointers into it...
> 
> I mean any stray pointers into that region are only going to see garbage at
> the relocated highmem address anyway, as contents of 0-1MB are no longer
> being copied. So deliberate poisoning seems even more paranoid than it
> already was (it was already really quite paranoid).

Right, I assumed the idea was that you could recognise the 0x55...55 as
being something more specific than random garbage. It is indeed quite
paranoid ;-)

Ian.



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