Hi Marc, In TF-A, the FF-A version is currently set to v1.2, but I am unable to find the corresponding implementation for EL3 SPMC configuration. I'm particularly interested in the support for FF-A Notification Mechanism. Could you please provide the timeline for when this will be added to the TF-A EL3 SPMC configuration?
Thank You! Akshay Belsare
Hi Akshay,
We've had an internal discussion and here's a digest (Marc and others, please chime in if required):
-Arm doesn't plan to implement FF-A notifications in the EL3 SPMC. Partner contributions are welcome.
-There are WIP changes [1] that may be of interest. Note, if those progress, final changes may support the spec only partially (e.g. no support for per vCPU notifications).
-The observation about EL3 SPMC returning FF-A v1.2 support per FFA_VERSION [2] may have to be fixed indeed. It should more likely return v1.1 with limitations that would have to be documented similarly to how the OP-TEE SPMC does [3].
-For the record, admitted this applies to recent chipsets implementing Armv8.4 FEAT_SEL2, Hafnium/S-EL2 SPMC implements the full FF-A notifications support [4].
Regards, Olivier.
[1] https://review.trustedfirmware.org/c/TF-A/trusted-firmware-a/+/26591/ [2] https://git.trustedfirmware.org/plugins/gitiles/TF-A/trusted-firmware-a/+/re... [3] https://optee.readthedocs.io/en/latest/architecture/spmc.html#ff-a-complianc... [4] https://hafnium.readthedocs.io/en/latest/secure-partition-manager/secure-par...
________________________________ From: Belsare, Akshay via TF-A tf-a@lists.trustedfirmware.org Sent: 17 September 2024 10:01 To: Marc Bonnici Marc.Bonnici@arm.com; tf-a@lists.trustedfirmware.org tf-a@lists.trustedfirmware.org Cc: Simek, Michal michal.simek@amd.com; Nagal, Amit amit.nagal@amd.com; Bollapalli, Maheedhar Sai MaheedharSai.Bollapalli@amd.com; Gudipalli, Sugadeesh sugadeesh.gudipalli@amd.com Subject: [TF-A] TF-A EL3 SPMC upgrade to FF-A Spec v1.2
Hi Marc,
In TF-A, the FF-A version is currently set to v1.2, but I am unable to find the corresponding implementation for EL3 SPMC configuration.
I'm particularly interested in the support for FF-A Notification Mechanism. Could you please provide the timeline for when this will be added to the TF-A EL3 SPMC configuration?
Thank You!
Akshay Belsare
Thank you, Oliver! The information you provided is helpful to us.
Regards, Akshay Belsare
From: Olivier Deprez Olivier.Deprez@arm.com Sent: Monday, September 23, 2024 6:31 PM To: Marc Bonnici Marc.Bonnici@arm.com; tf-a@lists.trustedfirmware.org; Belsare, Akshay akshay.belsare@amd.com Cc: Simek, Michal michal.simek@amd.com; Nagal, Amit amit.nagal@amd.com; Bollapalli, Maheedhar Sai MaheedharSai.Bollapalli@amd.com; Gudipalli, Sugadeesh sugadeesh.gudipalli@amd.com Subject: Re: TF-A EL3 SPMC upgrade to FF-A Spec v1.2
Hi Akshay,
We've had an internal discussion and here's a digest (Marc and others, please chime in if required):
-Arm doesn't plan to implement FF-A notifications in the EL3 SPMC. Partner contributions are welcome.
-There are WIP changes [1] that may be of interest. Note, if those progress, final changes may support the spec only partially (e.g. no support for per vCPU notifications).
-The observation about EL3 SPMC returning FF-A v1.2 support per FFA_VERSION [2] may have to be fixed indeed. It should more likely return v1.1 with limitations that would have to be documented similarly to how the OP-TEE SPMC does [3].
-For the record, admitted this applies to recent chipsets implementing Armv8.4 FEAT_SEL2, Hafnium/S-EL2 SPMC implements the full FF-A notifications support [4].
Regards, Olivier.
[1] https://review.trustedfirmware.org/c/TF-A/trusted-firmware-a/+/26591/ [2] https://git.trustedfirmware.org/plugins/gitiles/TF-A/trusted-firmware-a/+/re... [3] https://optee.readthedocs.io/en/latest/architecture/spmc.html#ff-a-complianc... [4] https://hafnium.readthedocs.io/en/latest/secure-partition-manager/secure-par...
________________________________ From: Belsare, Akshay via TF-A <tf-a@lists.trustedfirmware.orgmailto:tf-a@lists.trustedfirmware.org> Sent: 17 September 2024 10:01 To: Marc Bonnici <Marc.Bonnici@arm.commailto:Marc.Bonnici@arm.com>; tf-a@lists.trustedfirmware.orgmailto:tf-a@lists.trustedfirmware.org <tf-a@lists.trustedfirmware.orgmailto:tf-a@lists.trustedfirmware.org> Cc: Simek, Michal <michal.simek@amd.commailto:michal.simek@amd.com>; Nagal, Amit <amit.nagal@amd.commailto:amit.nagal@amd.com>; Bollapalli, Maheedhar Sai <MaheedharSai.Bollapalli@amd.commailto:MaheedharSai.Bollapalli@amd.com>; Gudipalli, Sugadeesh <sugadeesh.gudipalli@amd.commailto:sugadeesh.gudipalli@amd.com> Subject: [TF-A] TF-A EL3 SPMC upgrade to FF-A Spec v1.2
Hi Marc,
In TF-A, the FF-A version is currently set to v1.2, but I am unable to find the corresponding implementation for EL3 SPMC configuration.
I'm particularly interested in the support for FF-A Notification Mechanism. Could you please provide the timeline for when this will be added to the TF-A EL3 SPMC configuration?
Thank You!
Akshay Belsare
tf-a@lists.trustedfirmware.org
-
Belsare, Akshay -
Olivier Deprez