tree 4fb29b2952266dba664fca208f61530696241175
parent bea64fd5272deaf53111135baf36abb47b73b93e
author Arvind Ram Prakash <arvind.ramprakash@arm.com> 1738942112 +0100
committer Yann Gautier <yann.gautier@st.com> 1738949523 +0100

fix(security): apply SMCCC_ARCH_WORKAROUND_4 to affected cpus

This patch implements SMCCC_ARCH_WORKAROUND_4 and
allows discovery through SMCCC_ARCH_FEATURES.
This mechanism is enabled if CVE_2024_7881 [1] is enabled
by the platform. If CVE_2024_7881 mitigation
is implemented, the discovery call returns 0,
if not -1 (SMC_ARCH_CALL_NOT_SUPPORTED).

For more information about SMCCC_ARCH_WORKAROUND_4 [2], please
refer to the SMCCC Specification reference provided below.

[1]: https://developer.arm.com/Arm%20Security%20Center/Arm%20CPU%20Vulnerability%20CVE-2024-7881
[2]: https://developer.arm.com/documentation/den0028/latest

Signed-off-by: Arvind Ram Prakash <arvind.ramprakash@arm.com>
Change-Id: I1b1ffaa1f806f07472fd79d5525f81764d99bc79
(cherry picked from commit 8ae6b1ad6c9c57b09b6d4e7ae3cbdf3aed6455b1)