Sorry, it was back ported to 4.9.75 :-) On Mon, Jan 8, 2018 at 12:34 PM, Nick Lowe <nick.lowe at gmail.com> wrote: > It looks like PCID and INVPCID support is likely to be back ported to > the 4.9.76 Linux Kernel: https://patchwork.kernel.org/patch/10143225/