Re: [PATCH v15 08/13] x86/cpu/amd: Do not print FW_BUG for Secure TSC

Borislav Petkov
2024-12-17T11:10:54Z

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.