Re: [Xen-devel] [PATCH] Intel(R) Trusted Execution Technology su

To:	"Cihula, Joseph" <joseph.cihula@xxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxx>, <xense-devel@xxxxxxxxxxxxxxxxxxx>
Subject:	Re: [Xen-devel] [PATCH] Intel(R) Trusted Execution Technology support
From:	Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>
Date:	Mon, 29 Oct 2007 18:04:56 +0000
Cc:	"Xu, James" <james.xu@xxxxxxxxx>, "Wang, Shane" <shane.wang@xxxxxxxxx>, "Wei, Gang" <gang.wei@xxxxxxxxx>
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On 29/10/07 18:00, "Cihula, Joseph" <joseph.cihula@xxxxxxxxx> wrote:

>> By low memory, do you mean the signature is in the bottom megabyte of
>> memory? If that's guaranteed then can we just scan the whole lot
>> 0x00000-0xfffff (excluding VGA hole)?
> 
> Yes, it's in the lower 1MB and that is where dom0 has problems with
> gaps.  But I think that the UNUSABLE->RESERVED approach will be just as
> effective and reduce the amount of memory to scan as well.

Okay, we should limit the scan to page-aligned addresses in UNUSABLE regions
below 1MB. It makes sense to put the UNUSABLE->RESERVED hack in Xen itself,
rather than in tboot. Once the interface is baked into 3.2.0 it's not
changing on our side.

 -- Keir

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