Hi Okash,
Introduced build option [1] limits to MTE1 that supports MTE related instructions, but does not offer any functional usage in terms of detecting tag check faults. That's why memory is not configured as normal tagged (which is an MTE2 feature) in BL31, and
support for
MTE2 for BL31 is a topic for technical debt.
Thanks,
Manish Badarkhe
From:
Okash Khawaja <okash@google.com>
Date: Tuesday, 5 April 2022 at 16:13
To: Manish Badarkhe <Manish.Badarkhe@arm.com>
Cc: tf-a@lists.trustedfirmware.org <tf-a@lists.trustedfirmware.org>
Subject: Re: [TF-A] Status of MTE for bl31
Hi Manish,
That's another question I wanted to follow up with. Is there any real benefit of MTE for BL31 given that it doesn't allocate memory dynamically. I guess stack tagging is the only use of MTE in BL31?
The concern in the original email is whether the support is incomplete. Can you confirm?
Thanks,
Okash
On Tue, Apr 5, 2022 at 3:27 PM Manish Badarkhe <Manish.Badarkhe@arm.com> wrote:
Hi Okash,
Could you please let us know the real use case/requirement where you want MTE to be available at EL3?
Thanks,
Manish Badarkhe
From: Okash Khawaja via TF-A <tf-a@lists.trustedfirmware.org>
Date: Friday, 1 April 2022 at 19:51
To: tf-a@lists.trustedfirmware.org <tf-a@lists.trustedfirmware.org>
Subject: [TF-A] Status of MTE for bl31Hi,
I wanted to check the status of MTE support for bl31 itself. It seems
like the support was added [1] for clang and armclang but I couldn't
find the memory attribute to map pages as tag checked [2]. Is there
something I missed?
Thanks,
Okash
[1] https://review.trustedfirmware.org/plugins/gitiles/TF-A/trusted-firmware-a/+/fd32deeed9914a33341c821e18a1ced29bbe2185
[2] https://review.trustedfirmware.org/plugins/gitiles/TF-A/trusted-firmware-a/+/refs/tags/v2.6/lib/xlat_tables_v2/aarch64/xlat_tables_arch.c#254
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