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Re: [Xen-devel] ACPI-Tables corrupted?

To: Jan Beulich <JBeulich@xxxxxxxxxx>, Juergen Gross <juergen.gross@xxxxxxxxxxxxxx>
Subject: Re: [Xen-devel] ACPI-Tables corrupted?
From: Keir Fraser <keir.fraser@xxxxxxxxxxxxx>
Date: Fri, 6 Aug 2010 15:04:45 +0100
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On 06/08/2010 14:39, "Jan Beulich" <JBeulich@xxxxxxxxxx> wrote:

>> If we don't zap the DMAR then every existing dom0 kernel will fail with new
>> hypervisor.
> Who decided that this zapping is going to work on all systems in the
> future?

Someone at Intel.

> E.g. I can't see why a BIOS shouldn't decide to put most of
> the ACPI tables in chipset write protected memory, if a chipset offers
> such? In such an environment, Dom0 would still see the original
> signature - shouldn't we thus correct the original mistake of fiddling
> with the ACPI tables as we now have to touch that code anyway?

Well it's harmless to try zapping it I think, now we reinstate it on kexec.
Trying to be smarter in dom0 *as well* is plausible I guess.

 -- Keir

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