Re: [PATCH v15 04/13] x86/sev: Change TSC MSR behavior for Secure TSC enabled guests

Borislav Petkov
2024-12-11T19:00:41Z

On Tue, Dec 10, 2024 at 08:29:31AM -0600, Tom Lendacky wrote:
> > This is changing the behavior for SEV-ES and SNP guests(non SECURE_TSC), TSC MSR
> > reads are converted to RDTSC. This is a good optimization. But just wanted to
> > bring up the subtle impact.
>
> Right, I think it should still flow through the GHCB MSR request for
> non-Secure TSC guests.

Why?

I'm trying to think of a reason but I'm getting confused by what needs to
happen where and when... :-\

--
Regards/Gruss,
Boris.