[PATCH v3 00/25] x86: Enhance MTRR functionality to support multiple CPUs

Bin Meng bmeng.cn at gmail.com
Tue Jul 7 10:54:31 CEST 2020

Hi Simon,

On Mon, Jul 6, 2020 at 11:37 AM 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.

Testing this series on Minnowmax, the "mtrr" command fails:

=> mtrr
CPU 0:
Failed to read CPU 0 (err=-110)

Could you please take a look?


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