SLAM: Spectre based on Linear Address Masking

[taggart]

This one is sort of weird, it's a vulnerability that researchers have found in features planned for future CPU designs (but also some existing).

According to the list on the SLAM page:

• Future Intel CPUs supporting LAM (both 4- and 5-level paging);
• Future AMD CPUs supporting UAI and 5-level paging;
• Future Arm CPUs supporting TBI and 5-level paging. but also
• Existing AMD CPUs vulnerable to CVE-2020-12965;

Intel/AMD/ARM have been advised and linux patches are being developed to disable these CPU features until more is known.

But accoding to the above the existing AMD Zen+ and Zen2 may be vulnerable, so SMC should probably report that for those cpus.