Just as a FYI, according to: * https://lkml.org/lkml/2018/1/4/432 https://lkml.org/lkml/2018/1/4/432 * http://xenbits.xen.org/gitweb/?p=people/andrewcoop/xen.g

Just as a FYI, according to: * https://lkml.org/lkml/2018/1/4/432 https://lkml.org/lkml/2018/1/4/432 * http://xenbits.xen.org/gitweb/?p=people/andrewcoop/xen.git;a=blob;f=xen/arch/x86/spec_ctrl.c;h=79aedf774a390293dfd564ce978500085344e305;hb=refs/heads/sp2-mitigations-v6.5#l168 http://xenbits.xen.org/gitweb/?p=people/andrewcoop/xen.git;a... It appears that Skylake and later can actually predict retpolines? Some hardware features called IBRS, IBPB, STIBP (not a lot of details on this are out there) are supposedly coming in a microcode update.