linux-kernel - Re: [PATCH v15 06/13] x86/sev: Prevent GUEST_TSC_FREQ MSR interception for Secure TSC enabled guests

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Message-ID: <20241210171858.GKZ1h4Apb2kWr6KAyL@fat_crate.local>
Date: Tue, 10 Dec 2024 18:18:58 +0100
From: Borislav Petkov <bp@...en8.de>
To: Nikunj A Dadhania <nikunj@....com>
Cc: linux-kernel@...r.kernel.org, thomas.lendacky@....com, x86@...nel.org,
	kvm@...r.kernel.org, mingo@...hat.com, tglx@...utronix.de,
	dave.hansen@...ux.intel.com, pgonda@...gle.com, seanjc@...gle.com,
	pbonzini@...hat.com
Subject: Re: [PATCH v15 06/13] x86/sev: Prevent GUEST_TSC_FREQ MSR
 interception for Secure TSC enabled guests

On Tue, Dec 10, 2024 at 10:43:05PM +0530, Nikunj A Dadhania wrote:
> This is incorrect, for a non-Secure TSC guest, a read of intercepted 
> MSR_AMD64_GUEST_TSC_FREQ will return value of rdtsc_ordered(). This is an invalid 
> MSR when SecureTSC is not enabled.

So how would you change this diff to fix this?

-- 
Regards/Gruss,
    Boris.

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