>https://www.phoronix.com/scan.php?page=news_item&px=x86-PTI-EPYC-Linux-4.15-Test
>
>Phoronix is reporting that AMD is also insecure.

That's not really what they're reporting. What they found is that Linux code implementing KPTI is forced to run on all x86-64 architectures at this time; they're all considered "insecure" by default. So slowdowns caused by KPTI are found on all x86-64 processors running these Linux kernels. It remains to be seen which CPUs actually need these mitigations.

Looks like some of the major players have released findings:

Google Project Zero overview: https://security.googleblog.com/2018/01/todays-cpu-vulnerability-what-you-need.html

Google Project Zero technical background: https://googleprojectzero.blogspot.ca/2018/01/reading-privileged-memory-with-side.html

AMD response: http://www.amd.com/en/corporate/speculative-execution

I haven't seen any official Intel response so far.

At this particular nanosecond it looks like AMD, ARM and Intel all have some problems. Intel has the most exploitable issues at least with the Haswell Xeon the Google team was testing. AMD claims to have fewer issues than Intel.

I expect other researchers will test in the near future. Findings may or may not be reported depending on whether they're at 3-letter agencies.