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Re: [PATCH] x86/spec-ctrl: More MSR_ARCH_CAPS enumerations
- To: Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Andrew Cooper <Andrew.Cooper3@xxxxxxxxxx>
- Date: Fri, 10 Jun 2022 17:13:35 +0000
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- Cc: Jan Beulich <JBeulich@xxxxxxxx>, Roger Pau Monne <roger.pau@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>
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- Thread-topic: [PATCH] x86/spec-ctrl: More MSR_ARCH_CAPS enumerations
On 10/06/2022 17:00, Andrew Cooper wrote:
> https://www.intel.com/content/www/us/en/developer/articles/technical/software-security-guidance/best-practices/data-operand-independent-timing-isa-guidance.html
> https://www.intel.com/content/www/us/en/developer/articles/technical/software-security-guidance/advisory-guidance/running-average-power-limit-energy-reporting.html
>
> Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
> ---
> CC: Jan Beulich <JBeulich@xxxxxxxx>
> CC: Roger Pau Monné <roger.pau@xxxxxxxxxx>
> CC: Wei Liu <wl@xxxxxxx>
>
> The SDM also lists
>
> #define ARCH_CAPS_OVERCLOCKING_STATUS (_AC(1, ULL) << 23)
>
> but I've got no idea what this is, nor the index of MSR_OVERCLOCKING_STATUS
> which is the thing allegedly enumerated by this.
Found it. There's an OVER{C}CLOCKING typo in the SDM. It's MSR 0x195
and new in AlderLake it seems.
~Andrew
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