> Running that PoC on the machine while in -current and even 6.1 (no > patches) returns that the system is not vulnerable to meltdown. This > processor was made in 2016 and everything I've read indicates that it > should be vulnerable.
Such a low-grade processor may not have sufficient speculative prefetch to cause the problem, but it is very strange to see the bit set which indicates it is invulnerable. Did someone know ahead of time about this problem and a speculative-prefetch bit already existed and Intel did bravado to indicate it was the new checking mechanism? Or was the bit already there and reused to indicate this?
