Found this in the
Meltdown PDF
page 13, bottom right, 6.4
Please read the entire paragraph. I read it that AMD and ARM are NOT susceptible to meltdown:
6.4 Limitations on ARM and AMD
We also tried to reproduce the Meltdown bug on several
ARM and AMD CPUs. However, we did not manage
to successfully leak kernel memory with the attack de-
scribed in Section 5, neither on ARM nor on AMD. The
reasons for this can be manifold. First of all, our im-
plementation might simply be too slow and a more opti-
mized version might succeed. For instance, a more shal-
low out-of-order execution pipeline could tip the race
condition towards against the data leakage. Similarly,
if the processor lacks certain features, e.g., no re-order
buffer, our current implementation might not be able to
leak data. However, for both ARM and AMD, the toy
example as described in Section 3 works reliably, indi-
cating that out-of-order execution generally occurs and
instructions past illegal memory accesses are also per-
formed.