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[2603:6081:7b00:6400:8f6:b38b:1fda:25aa]) by smtp.gmail.com with ESMTPSA id 10-20020a25000a000000b00d1b86efc0ffsm718998yba.6.2023.07.26.12.39.13 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 26 Jul 2023 12:39:14 -0700 (PDT) Date: Wed, 26 Jul 2023 15:39:12 -0400 From: Tom Rini To: Abdellatif El Khlifi , Meenakshi Aggarwal , Priyanka Jain , Wasim Khan Cc: nd@arm.com, u-boot@lists.denx.de, Gowtham Suresh Kumar , Simon Glass , Ilias Apalodimas , Jens Wiklander Subject: Re: [PATCH v16 09/10] arm_ffa: efi: introduce FF-A MM communication Message-ID: <20230726193912.GX3630934@bill-the-cat> References: <20230725185246.GE3630934@bill-the-cat> <20230726094503.100497-1-abdellatif.elkhlifi@arm.com> <20230726094503.100497-10-abdellatif.elkhlifi@arm.com> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="/FU7zvhUo7OsKtup" Content-Disposition: inline In-Reply-To: <20230726094503.100497-10-abdellatif.elkhlifi@arm.com> X-Clacks-Overhead: GNU Terry Pratchett X-BeenThere: u-boot@lists.denx.de X-Mailman-Version: 2.1.39 Precedence: list List-Id: U-Boot discussion List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: u-boot-bounces@lists.denx.de Sender: "U-Boot" X-Virus-Scanned: clamav-milter 0.103.8 at phobos.denx.de X-Virus-Status: Clean --/FU7zvhUo7OsKtup Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Wed, Jul 26, 2023 at 10:45:02AM +0100, Abdellatif El Khlifi wrote: > Add MM communication support using FF-A transport >=20 > This feature allows accessing MM partitions services through > EFI MM communication protocol. MM partitions such as StandAlonneMM > or smm-gateway secure partitions which reside in secure world. >=20 > An MM shared buffer and a door bell event are used to exchange > the data. >=20 > The data is used by EFI services such as GetVariable()/SetVariable() > and copied from the communication buffer to the MM shared buffer. >=20 > The secure partition is notified about availability of data in the > MM shared buffer by an FF-A message (door bell). >=20 > On such event, MM SP can read the data and updates the MM shared > buffer with the response data. >=20 > The response data is copied back to the communication buffer and > consumed by the EFI subsystem. >=20 > MM communication protocol supports FF-A 64-bit direct messaging. >=20 > Signed-off-by: Abdellatif El Khlifi > Tested-by: Gowtham Suresh Kumar > Reviewed-by: Simon Glass > Cc: Tom Rini > Cc: Ilias Apalodimas > Cc: Jens Wiklander So, at this point in the series we impact lx2160ardb_tfa_stmm which is the only config in the tree prior to this series that sets CONFIG_EFI_MM_COMM_TEE. I'm not going to block this series[1] on updating lx2160ardb_tfa_stmm as well, but I do want to make sure the maintainers there are aware and can update the config to support the current state of this technology. [1]: https://patchwork.ozlabs.org/project/uboot/list/?series=3D365876&state= =3D* --=20 Tom --/FU7zvhUo7OsKtup Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQGzBAABCgAdFiEEGjx/cOCPqxcHgJu/FHw5/5Y0tywFAmTBdl0ACgkQFHw5/5Y0 tywA1Av+L+PNvUMOz/Izw1i92mkxsIMQJsPk0lH/KrVe2rrl8U1bNHGv72EAzboX bVYaX6P19gZNGzvv0UmFx3GsPXnrsIxqFbcUh9xs2Llz8XDCXUahpsNYQpqfKajE 9Mfxgz6cgAKz6AVBcPePm7zejTLgKQLxo9FLUaMkxiVesyNw+nEYJR8+nWJjAn1i WJ80MKTvutfobz6kwVGb8I86mn3eUqwVGnZ3M6gQt1wBr2eeEYlfJprReyaiIub5 EkxeXCjNEh8JSmDbzVJ4fvU8KCxNzX/y17ZZJfJCQtqAzLheQwxn0UnZ3+8jUWWV qzP2kZaOix18SeoSt0Fvymeg5l+H1IxtSd2H/D1T1+hwSjWJeat4xQML32t9Z11a JkdBohkrLt2JxzWQZ++HaXohGcjl9QWFwuE1ESRetMHob9MzAt/XdZEcQ4W+Cy90 3kFn2LwtADw+IPxYp+9JWBH2FWHe+z2HNJKY5sDOIfW58pz1CbkFFivNJrlzFSii he+nP8oV =BhRT -----END PGP SIGNATURE----- --/FU7zvhUo7OsKtup--