On Sun, Jan 21, 2018 at 06:54:22PM +0000, David Woodhouse wrote:
> Because we're backporting this to every stable kernel under the sun,
> and they don't already require asm-goto.
Considering the cost of the barrier, I'd simplify the whole endeavor
*considerably* for backporting:
if (boot_cpu_has(X86_FEATURE_IBPB))
wrmsr(MSR_IA32_PRED_CMD, PRED_CMD_IBPB, 0);
Problem solved.
Upstream can then do static_cpu_has() if it wants to.
--
Regards/Gruss,
Boris.
Good mailing practices for 400: avoid top-posting and trim the reply.
