linux-kernel - Re: [PATCH v15 08/13] x86/cpu/amd: Do not print FW

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Message-ID: <20241217111032.GCZ2FcKI9ANjz3Xb4h@fat_crate.local>
Date: Tue, 17 Dec 2024 12:10:32 +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 08/13] x86/cpu/amd: Do not print FW_BUG for Secure TSC

On Tue, Dec 03, 2024 at 02:30:40PM +0530, Nikunj A Dadhania wrote:
> When Secure TSC is enabled and TscInvariant (bit 8) in CPUID_8000_0007_edx
> is set, the kernel complains with the below firmware bug:
> 
> [Firmware Bug]: TSC doesn't count with P0 frequency!

This happens in a normal guest too:

[    0.000000] [Firmware Bug]: TSC doesn't count with P0 frequency!
[    0.000000] BIOS-provided physical RAM map:
[    0.000000] BIOS-e820: [mem 0x0000000000000000-0x000000000009ffff] usable
...
[    0.000000] DMI: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 2023.11-8 02/21/2024
...

If anything, this should check X86_FEATURE_HYPERVISOR but this is just a silly
warning so you don't really need to do anything about it.

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette