linux-kernel - Re: [PATCH v15 10/13] tsc: Upgrade TSC clocksource rating

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Message-ID: <20250103120632.GCZ3fSyMiODH8-XBC4@fat_crate.local>
Date: Fri, 3 Jan 2025 13:06:32 +0100
From: Borislav Petkov <bp@...en8.de>
To: "Nikunj A. Dadhania" <nikunj@....com>
Cc: tglx@...utronix.de, linux-kernel@...r.kernel.org,
	thomas.lendacky@....com, x86@...nel.org, kvm@...r.kernel.org,
	mingo@...hat.com, dave.hansen@...ux.intel.com, pgonda@...gle.com,
	seanjc@...gle.com, pbonzini@...hat.com,
	Alexey Makhalov <alexey.makhalov@...adcom.com>,
	Juergen Gross <jgross@...e.com>,
	Boris Ostrovsky <boris.ostrovsky@...cle.com>
Subject: Re: [PATCH v15 10/13] tsc: Upgrade TSC clocksource rating

On Fri, Jan 03, 2025 at 03:39:56PM +0530, Nikunj A. Dadhania wrote:
> Right, let me limit this only to virtualized environments as part of 
> CONFIG_PARAVIRT.

That's not what you do below - you check whether you're running as a guest.

And that's not sufficient as I just said. I think the only somewhat reliable
thing you can do is when you're running as a STSC guest.

-- 
Regards/Gruss,
    Boris.

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