There’s mte and emte (it’s actually way more complicated than that). Mte was shown to be vulnerable to some exploit which is partly why emte got released. The graphene os people were saying the whole time they need a new platform with emte not just mte.

Which is one reason why only the elite version of whatever qualcomm soc qualifies.

Your pixel 8 supports mte, not emte.

I don’t have a pixel 8 in front of me to perform this check on but you could easily disprove what I just said by checking proc/cpuinfo for ID_AA64PFR1_EL1.MTEX, ID_AA64PFR2_EL1.MTESTOREONLY and ID_AA64PFR2_EL1.MTEFAR or however cpuinfo reports them.

Those are the baseline implementation of enhanced memory tagging extensions, although there are more, and they’re completely optional silicon. Defined by a standard the tensor g3 processor in your pixel 8 adheres to but not required to be present.

E: I might be using some of the wrong language here for arm stuff. I spend more time in the esp world.