Re: [PATCH v3 3/5] x86/enter: Use IBRS on syscall and interrupts

[Woodhouse, David]

On Tue, 2018-01-09 at 18:26 -0800, Tim Chen wrote:
> Set IBRS upon kernel entrance via syscall and interrupts. Clear it
> upon exit.Â

In the former set of sites, you're going to want to stuff the RSB too.
The patch I sent out this morning adds the infrastructure you want for
that; we'll just want to shift it from being dependent on RETPOLINE
(both CONFIG_RETPOLINE and X86_FEATURE_RETPOLINE).

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