Re: [PATCH 0/7] IBRS patch series

[David Woodhouse]

On Fri, 2018-01-05 at 06:25 +0100, Florian Weimer wrote:
> 
> Retpoline also looks incompatible with CET, so future Intel CPUs will
> eventually need a different approach anyway.

CPUs with CET will have the indirect branch problem fixed, so the
retpoline ALTERNATIVE will be used which is a bare 'jmp *%reg'.

That's why we switched the ABI for the retpoline from having the target
address on the stack, to passing it in in a register.

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