Re: [PATCH v7 1/2] fTPM: firmware TPM running in TEE

From: Ilias Apalodimas <ilias.apalodimas@linaro.org>
To: Thirupathaiah Annapureddy <thiruan@microsoft.com>
Cc: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>,
	Sasha Levin <sashal@kernel.org>,
	"peterhuewe@gmx.de" <peterhuewe@gmx.de>,
	"jgg@ziepe.ca" <jgg@ziepe.ca>, "corbet@lwn.net" <corbet@lwn.net>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"linux-doc@vger.kernel.org" <linux-doc@vger.kernel.org>,
	"linux-integrity@vger.kernel.org"
	<linux-integrity@vger.kernel.org>,
	Microsoft Linux Kernel List <linux-kernel@microsoft.com>,
	"Bryan Kelly (CSI)" <bryankel@microsoft.com>,
	"tee-dev@lists.linaro.org" <tee-dev@lists.linaro.org>,
	"sumit.garg@linaro.org" <sumit.garg@linaro.org>,
	"rdunlap@infradead.org" <rdunlap@infradead.org>,
	Joakim Bech <joakim.bech@linaro.org>
Subject: Re: [PATCH v7 1/2] fTPM: firmware TPM running in TEE
Date: Wed, 10 Jul 2019 15:13:58 +0300	[thread overview]
Message-ID: <20190710121358.GA12965@apalos> (raw)
In-Reply-To: <CY4PR21MB027937ADCEBF85826FF3516FBCF50@CY4PR21MB0279.namprd21.prod.outlook.com>

Hi Thirupathaiah

Apologies for tha lte reply, i somehow misplaced this mail.

[...]
> > 
> > Please check the previous mail from Sumit. It explains exaclty what's going on.
> > The tl;dr version is that the storage is up only when the supplicant is
> > running.
> 
> I definitely know that OP-TEE can access storage only when the "user mode" supplicant 
> is running :). But fTPM NV storage should have been initialized in 
> in the preboot environment (UEFI/U-boot). 
> 
> It would also be helpful to understand the overall use case/scenario (Measured boot?)you
> are trying to exercise with the fTPM. 

In the future yesm measured boot/ For now it's more like like try running it in
QEMU to demonstrate firmware TPM makes sense and has use cases. 

> 
> I also want to emphasize that this discussion is turning into more of how 
> fTPM gets integrated/enabled in a new HW platform.  
> fTPM is hosted in github and you definitely bring any issues/feature requests there. 
> 

Ok

> 
> > 
> > > If you let me know the HW platform details, I am happy to work with you to
> > enable/integrate
> > > fTPM TA on that HW platform.
> > >
> > Thanks,
> > The hardware i am waiting for for has an eMMC RPMB. In theory the U-Boot
> > supplicant support will be there so i'll be able to test it.
> Can you give me the details of HW so that I can order one for myself? 

It's QEMU for now. We plan on doing something similar in an ST disco board
though.

> Is it one of the 96boards? 

stm32mp157c-dk2 is one of our targets.

> The reason for the ask is that we have not upstreamd u-boot fTPM stack yet, 
> although we have future plans for it. 
> 
> --Thiru
> 

Thanks
/Ilias