Re: [PATCH 1/7] x86/feature: Detect the x86 feature to control Speculation

Thomas Gleixner
2018-01-05T13:51:48Z

On Fri, 5 Jan 2018, Andrea Arcangeli wrote:
> On Fri, Jan 05, 2018 at 02:09:43PM +0100, Thomas Gleixner wrote:
> Now about the late microcode my preference is not for static_cpu_has
> and forcing the early microcode, but my long term preference is to
> start with this/boot_cpu_has() and then turn static_cpu_has in a true
> static key so that setup_force_cpu_cap shall also flip the static key
> for all static_cpu_has(X86_FEATURE_IBPB_SUPPORT) also if run any time
> after boot and not only if run before the static_cpu_has alternative
> is patched in.

Fair enough. We can avoid the static_cpu_has() to begin with and fix it
later.

Thanks,

tglx