On Fri, Jan 8, 2016 at 3:36 PM, Andy Lutomirski [off-list ref] wrote:

quoted

Either things have changed (newer hardware with more pcids perhaps?)
or you did a better job at it.

On my Skylake laptop, all of the PCID bits appear to have at least
some effect.  Whether this means it gets hashed or whether this means
that all of the bits are real, I don't know.

They have always gotten hashed, and no the bits aren't real - hardware
doesn't actually have as many bits in the pcid as there are in cr3.

              Linus

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