[PATCH v4 00/25] x86: Enhance MTRR functionality to support multiple CPUs

Simon Glass sjg at chromium.org
Fri Jul 17 05:24:22 CEST 2020

Hi Bin,

On Tue, 7 Jul 2020 at 19:36, Simon Glass <sjg at chromium.org> wrote:
> At present MTRRs are mirrored to the secondary CPUs only once, as those
> CPUs are started up. But U-Boot may add more MTRRs later, e.g. if it
> decides that a video console must be set up.
> This series enhances the x86 multi-processor support to allow MTRRs to
> be updated at any time. It also updates the 'mtrr' command to support
> setting the MTRRs on CPUs other than the boot CPU.
> Changes in v4:
> - Update get_bsp() to return zero when SMP is not inited
> - Add a Kconfig to control this feature, enabled only on APL
> - Only enable this feature of CONFIG_SMP_AP_WORK is enabled
> - Allow running on the BSP if SMP is not enabled
> - Update mp_next_cpu() to stop if CONFIG_SMP_AP_WORK is not enabled

Is anything else needed with this series?


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