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xense-devel
Re: [Xen-devel] [PATCH] Intel(R) Trusted Execution Technology support
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To: |
"Cihula, Joseph" <joseph.cihula@xxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxx>, <xense-devel@xxxxxxxxxxxxxxxxxxx> |
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Subject: |
Re: [Xen-devel] [PATCH] Intel(R) Trusted Execution Technology support |
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From: |
Keir Fraser <Keir.Fraser@xxxxxxxxxxxx> |
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Date: |
Sun, 28 Oct 2007 06:24:49 +0000 |
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Cc: |
"Xu, James" <james.xu@xxxxxxxxx>, "Wang, Shane" <shane.wang@xxxxxxxxx>, "Wei, Gang" <gang.wei@xxxxxxxxx> |
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Sat, 27 Oct 2007 23:20:08 -0700 |
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[Xen-devel] [PATCH] Intel(R) Trusted Execution Technology support |
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On 27/10/07 20:39, "Cihula, Joseph" <joseph.cihula@xxxxxxxxx> wrote:
>> If that's the only reason, we could add another command-line option,
> or a
>> multiboot info flag, to prevent just the e820 part of real-mode
> execution.
>> Then you could still set video mode and get disc EDD info even when
> running
>> on tboot.
>
> It isn't the only reason: the current tboot code will measure and
> verify xen and dom0; if we let xen call into BIOS then we will be
> transferring control to code that has not been verified.
>
> If it is very important to initialize the video and disc from BIOS, we
> could copy that code into tboot and execute it before tboot launches the
> measured environment. Is this necessary on current model systems (since
> TXT is only available on Intel Core 2 -based systems)?
It'd be nice to have, but it's not essential.
-- Keir
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