On 2013-05-08, Matthew Garrett wrote:
> On Tue, 2013-05-07 at 22:55 +0800, Qiaowei Ren wrote:
>
>> +What: /sys/devices/platform/intel_txt/log/log_header
>> +Date: May 2013
>> +KernelVersion: 3.9
>
> How different are these logs to the TPM measurements exported via
> securityfs?
These logs come from tboot (Trusted Boot, an open source, pre-kernel/VMM module that uses Intel® Trusted Execution Technology (Intel® TXT) to perform a measured and verified launch of an OS kernel/VMM.), and should be different from those TPM measurements (from BIOS?) exported via security.
>> +What: /sys/devices/platform/intel_txt/log/block_index
>> +Date: May 2013
>> +KernelVersion: 3.9
>> +Contact: "Qiaowei Ren" <qiaowei.ren@xxxxxxxxx>
>> +Description: The "block_index" property allows you to set the block
>> + index for output.
>
> So I write a value here and then I see different chunks of log? This
> doesn't seem like an optimal interface. What do these logs actually
> contain? How do I know which block I should be reading?
Yes. Since total log size is bigger than one page 4K, the log have to be displayed in 4K-block indexed by block_index.
These logs will be very helpful for txt related debugging.
Thanks,
Qiaowei
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