Re: [Xen-devel] [PATCH] [HVM] [TPM] [1/3] Add TPM TIS type of device toACPI device list

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 27/10/06 6:02 pm, "Stefan Berger" <stefanb@xxxxxxxxxx> wrote:

> To solve this we would need one of the following 
> - a BIOS that probes for such devices and dynamically appends the info to the (static) ACPI tables 
> - a tool that builds and compiles the ACPI tables according to the desired configuration of the HVM VM before the HVM is started 
>
> A later version (2.6.18) of the corresponding Linux driver allows you to modprobe the module with a '-force' parameter for platforms where the correct ACPI information is not available. [In that case if the vTPM facility is not available, the /dev/tpm0 won't become available.] 
>
> I am not sure what the right solution is. 

I think your above proposed solution is correct: either dynamically append info to a static spartan ACPI table, or dynamically trim down a static ‘christmas tree’ ACPI table. Probably the former is best, and done in hvmloader.

 -- Keir



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