On Mon, 19 Feb 2018, David Woodhouse wrote: > Retpoline means the kernel is safe because it has no indirect branches. > But firmware isn't, so use IBRS for firmware calls if it's available. > > Block preemption while IBRS is set, although in practice the call sites > already had to be doing that. > > Ignore hpwdt.c for now. It's taking spinlocks and calling into firmware > code, from an NMI handler. I don't want to touch that with a bargepole. > > Signed-off-by: David Woodhouse <dwmw@xxxxxxxxxxxx> Reviewed-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
