[SLOF] [PATCH 00/16] Add vTPM support to SLOF

Nikunj A Dadhania nikunj at linux.vnet.ibm.com
Tue Sep 29 18:45:31 AEST 2015

Hi Stefan,

Stefan Berger <stefanb at linux.vnet.ibm.com> writes:

> The following series of patches adds TPM support to SLOF.
> In particular it adds the following:
> - TPM drivers for hardware interface and CRQ interface
> - TPM initialization
> - TPM logging area and firmware API to transfer it to the OS
>   (measurements are visible in sysfs)
> - Some measurement code (Static Core Root Of Trust)
> - TPM menu (accessible via 't' key during boot if TPM is available)
> - Firmware API extensions following Power Firmware Doc
>   (to make trusted grub work)

How much impact does this have on the boot time of the guest? Can you
share some measurements with and without this patches.

> Necessarily, some of its parts are written in Forth, many are written
> in 'C'. The extensions are known to work with QEMU for ppc64 running Linux.
> Patches 4-6 will eventually need to be merged to avoid compiler warnings
> related to unused functions.
> Regards,
>     Stefan


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