Re: [RFC/DISCUSSION] x86/tsc: Handling legacy PIT fallback calibration on modern platforms

[Sean Christopherson]

On Tue, Oct 06, 2026, Matthias Hahn wrote:
> (sorry, resending as plain text)
> 
> Hi everyone,
> 
> We have recently observed an issue regarding TSC calibration fallback on
> modern client/server platforms (specifically Raptor Lake and newer) when
> running inside restricted virtualized environments.

Can you give this Linux-as-a-guest TSC cleanup series a spin?  Among other things,
it addresses the problem of a constant, stable TSC being marked unstable because
the thing being used to calibrate the TSC is itself unstable.

https://lore.kernel.org/all/20260806233609.212337-1-seanjc@xxxxxxxxxx