In 2020 ARM announced CVE-2020-13844 (https://developer.arm.com/support/arm-security-updates/speculative-processor-vulnerability) which allows malevolent code to obtain secret data via a similar mechanism to Spectre. This vulnerability does not affect the Cortex R5 used in the AMD UltraScale™ and AMD Versal™ RPUs, and also does not affect the Cortex A53 used in the UltraScale+.
The mitigation for this vulnerability is to add the compiler option "-mharden-sls=all" to the build flags for the open-amp and libmetal libraries, and to the build flags for any application which is linked to them. This results in 2-5% larger executable code and probably a slight performance decrease.
Note: This compiler option is only available in 2022.2 and
after.