Recently a security researcher made the following claim via Twitter (emphasis added):
If you're running Windows, I'm about to publish a tool that checks if you have the "Variant 3: rogue data cache load (CVE-2017-5754)" aka #Meltdown patches applied, and if you have newer Intel hardware that seems to mitigate at the hardware level. This uses a new undocumented API https://t.co/6sA8tehceg
They also expanded on this a bit to say:
There’s a new CPUID bit and MSR on models 0x36 and later, looks like.
I'm not sure if/how I can verify this researchers possible discovery, so I don't know if this is true.
Does recent Intel hardware mitigate Meltdown at the hardware level? If so, how and how well, and on what hardware?