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TF-A Tech Forum
Thursday Oct 5, 2023 ⋅ 5pm – 6pm
Central European Time - Paris
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Hi All,
We are currently in the process of preparing for an upcoming release v2.10 [1] and are actively seeking out any deprecated platforms within the TF-A source code. We kindly request all platform owners and contributors to dedicate some time to review the TF-A source code for any platforms that may have been deprecated.
If you encounter any platforms that require deprecation but have not yet been labelled as such, we kindly request that you contribute by submitting the required changes to officially mark them as deprecated. You can follow the example provided in [2].
Thank you for your cooperation.
[1]: https://trustedfirmware-a.readthedocs.io/en/latest/about/release-informatio…
[2]: https://review.trustedfirmware.org/c/TF-A/trusted-firmware-a/+/17710
Regards,
Manish Badarkhe
Hi ,
When I grep for PLAT_XLAT_TABLES_DYNAMIC in /lib/lib/xlat_tables_v2/ ,
I see most references for PLAT_XLAT_TABLES_DYNAMIC are enclosed in #if directive.
Is there any specific reason why only below mentioned reference for PLAT_XLAT_TABLES_DYNAMIC
is covered with #ifdef and not under #if .
https://github.com/Xilinx/arm-trusted-firmware/blob/master/lib/xlat_tables_…
#ifdef PLAT_XLAT_TABLES_DYNAMIC
#define MAX_PHYS_ADDR tf_xlat_ctx.pa_max_address
#else
#define MAX_PHYS_ADDR tf_xlat_ctx.max_pa
#endif
Regards
Amit
Hi,
I am writing this email to find out any legacy platforms supports in TF-A (upstream or downstream) which does not have any NS-EL2 component running.
Because NS-EL2 is present but unused EL3 also need to do a minimal initialization of EL2. The side effect of this is, TF-A currently has extra code in generic path (e.g. cm_prepare_el3_exit() ) to cater for these platforms which is not required for most others.
The most likely reason why TF-A introduced support for systems without NS-EL2 was because of UEFI implementation for Windows which didn't initialize NS-EL2 properly. Given that the UEFI spec has said "Use the highest 64 bit non secure privilege level available" for a long time now we are safe to assume that any UEFI implementation will handover to windows at NS-EL2. (similar to Linux)
Considering that there are very few platforms which need this code and to keep backward compatibility, we propose to introduce a macro like "INIT_UNUSED_NS_EL2" and guard the code under this[1]. Keep this flag default disabled and get rid of it( along with code) altogether in next couple of releases, if we are certain that none of the platforms using it.
Please let me know if you are aware of any such platform configuration.
[1] https://review.trustedfirmware.org/c/TF-A/trusted-firmware-a/+/22716
Thanks
Manish
Hello,
Are EHF and OP-TEE (opteed) designed to work together? I'm seeing some strange behavior when NS interrupts are routed to EL3 as FIQs (due to EHF), but before I dig into it further I wanted to confirm if EHF + OP-TEE is a valid combination.
Some background: Our system, which uses OP-TEE, has some "aggregated interrupts" that contain both secure and non-secure sources, for which we wanted to use SDEI to filter and dispatch to Linux (and SDEI requires EHF).
Thanks!
-Brian
Hi everyone,
As you may know, console drivers in TF-A are required to provide a
number of callbacks. One of them is getc() (to read a character from the
console). Even though most platform ports provide a valid implementation
of it, it does not seem to be called anywhere in the code base today,
effectively qualifying it as dead code.
I did a bit of git history digging and from what I've seen, the very
first public version of TF-A (v0.2!) already had a getc() callback in
the Arm PL011 UART driver. So my guess is that all subsequent UART
drivers added after that followed the same approach. When the
multi-console framework was introduced, it naturally catered for this
feature as well.
However, taking a step back, I wonder why we introduced getc() in the
first place... Unlike other firmwares (like U-boot or EDK2), TF-A does
not implement any kind of interactive user shell. And from a security
point of view, getc() constitutes an attack vector into TF-A, which
might allow an attacker to inject arbitrary data. So keeping this
functionality without any valid use case sounds like a bad idea to me.
Now, even though getc() is not used in upstream TF-A code right now, I
realize there might be downstream / internal test setups which need it.
For example, for firmware recovery purposes (receiving a backup firmware
over a serial interface) or automated tests setups (some script driving
a test session using some communication protocol over a serial interface).
Is anyone depending on such use cases?
If not, then I suggest we consider removing getc() feature altogether.
We could always bring it back when there is a real use case for it (it
will survive through git history).
At the very least, I would like to disable getc() by default. Enabling
it would require setting a build flag.
Any thoughts or concerns?
Best regards,
Sandrine
Hello,
We use fiptool extensively to generate the FIP blobs for NVIDIA platforms. But, we encountered the following issues during deployment.
1. fiptool has a dependency on the host machine for OpenSSL and gcc.
2. fiptool resides under the TF-A repo and is used by Hafnium and SPs. This creates a cross-repository dependency.
As a workaround, we ship a prebuilt fiptool. But, due to OS dependency, this approach is not scalable across OS versions. E.g. One OS distribution might be using a lower OpenSSL version compared another, creating an incompatibility.
I was thinking if converting fiptool to a python script might help resolve these issues. Sptool was converted into a Python script, so was wondering if anyone has tried converting fiptool to a Python script too.
-Varun
Hi,
the code is still incorrect after half a year. It has been changed twice, without fixing it. There was no response to the report I created [1].
If there is no interest / lack of response I may get the impression that my contributions are not welcomed at TF-A. Thus, I decided to not report any issues in the future. Sadly, this is how the open source idea dies - at least for this project.
Best Regards,
Matthias
[1] https://lists.trustedfirmware.org/archives/list/tf-a@lists.trustedfirmware.…
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Hi All,
Please review the patch-set that adds the functionality in RMM to manage Scalable Matrix Extension (SME) context. If the CPU supports SME and if Realm accesses FPU/SVE functionality then NS SME state is saved to allow Realm to use FPU/SVE register state.
https://review.trustedfirmware.org/q/topic:%22rmm_sme%22+(status:open%20OR%…
Brief summary of changes made in different components:
RMM:
- Introduces SIMD context and exports APIs to the runtime component of RMM to initialize, save, restore, and switch SIMD context.
- Adds SME support in RMM to manage NS SME context. Supports SVE+SME config and SME only config.
- Handles SVE hint bit passed in RMI SMCs
- Handles SME exceptions from Realms
https://review.trustedfirmware.org/q/topic:%22rmm_sme%22+(status:open%20OR%…
TF-A:
- Enables FEAT_SME for RMM
- Passes SMCCCv1.3 SVE hint bit in SMC function ID to RMM
tf-a-tests:
- There are changes in common lib routines for sve, sme so that testcases running in NS-EL2, S-EL1, R-EL1 can use these helper routines.
- Adds helper routines to read, write, compare FPU and SVE Z, P, FFR registers
- Adds SMCCCv1.3 SVE hint bit support in TFTF framework
- Enables SME/SME2 during arch init
- Adds SME helper routines and extends SVE lib routines to support streaming SVE mode.
https://review.trustedfirmware.org/q/topic:%22rmm_sme%22+(status:open%20OR%…
Thanks,
Arun