Re: [PATCH v3 01/41] x86/tsc: Add a standalone helpers for getting TSC info from CPUID.0x15

[David Woodhouse]

On Fri, 2026-05-15 at 12:19 -0700, Sean Christopherson wrote:
> Extract retrieval of TSC frequency information from CPUID into standalone
> helpers so that TDX guest support can reuse the logic.  Provide a version
> that includes the multiplier math as TDX does NOT want to use
> native_calibrate_tsc()'s fallback logic that derives the TSC frequency
> based on CPUID.0x16, when the core crystal frequency isn't known.
> 
> Opportunsitically drop native_calibrate_tsc()'s "== 0" and "!= 0" checks
> in favor of the kernel's preferred style.

"Opportunistically" ? Now that looks wrong too... 

> No functional change intended.
> 
> Signed-off-by: Sean Christopherson <seanjc@xxxxxxxxxx>

Reviewed-by: David Woodhouse <dwmw@xxxxxxxxxxxx>

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