Just be aware that there are two issues at hand, Meltdown and Spectre.
Meltdown impacts only the Intel CPUs and ARM64 (
Cortex-A75 only). It is more severe, for example javascript in browser could read kernel memory. This is the big one as it is problem with the actual Intel architecture and can be only fixed in software by significant performance penalties or by a hardware change (moving to AMD CPU).
Spectre on the other hand includes several possible attacks. It is not as severe as it is more difficult to exploit but also more difficult to fix. It affects all CPUs. However, it is worth noting that the newer AMD CPUs (Ryzen and Epyc) employ a hardware neural network for branch prediction. This is much less predictable but, in theory, still possible to exploit.
Also note that Intel propaganda machine is trying hard to confuse the issue and minimise the damage by mixing up two exploits (Meltdown and Spectre) and trying to make it look like all CPUs are affected. In reality one type of exploit with less severity is general while the severe one is Intel specific.
