linux-kernel - Re: [PATCH v6 0/4] introduce tee-based EFI Runtime Variable Service

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Message-ID: <8ce9f761-347d-1e8c-17d7-241d88c82451@siemens.com>
Date:   Thu, 22 Jun 2023 16:56:53 +0200
From:   Jan Kiszka <jan.kiszka@...mens.com>
To:     Masahisa Kojima <masahisa.kojima@...aro.org>,
        Ard Biesheuvel <ardb@...nel.org>,
        Jens Wiklander <jens.wiklander@...aro.org>,
        Sumit Garg <sumit.garg@...aro.org>,
        linux-kernel@...r.kernel.org, op-tee@...ts.trustedfirmware.org
Cc:     Ilias Apalodimas <ilias.apalodimas@...aro.org>,
        Johan Hovold <johan+linaro@...nel.org>
Subject: Re: [PATCH v6 0/4] introduce tee-based EFI Runtime Variable Service

On 22.06.23 10:51, Masahisa Kojima wrote:
> This series introduces the tee based EFI Runtime Variable Service.
> 
> The eMMC device is typically owned by the non-secure world(linux in
> this case). There is an existing solution utilizing eMMC RPMB partition
> for EFI Variables, it is implemented by interacting with
> OP-TEE, StandaloneMM(as EFI Variable Service Pseudo TA), eMMC driver
> and tee-supplicant. The last piece is the tee-based variable access
> driver to interact with OP-TEE and StandaloneMM.
> 
> Changelog:
> v5 -> v6
> - new patch #4 is added in this series, #1-#3 patches are unchanged.
>   automatically update super block flag when the efivarops support
>   SetVariable runtime service, so that user does not need to manually
>   remount the efivarfs as RW.

But that is not yet resolving the architectural problem with that
userspace daemon dependency. What are the next steps for that now?

Thanks,
Jan

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