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 <d...@amazon.co.uk>

Reviewed-by: Thomas Gleixner <t...@linutronix.de>

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