Re: [PATCH v6 10/90] x86/cpu: Rescan CPUID table after disabling PSN

Borislav Petkov <[email protected]> Wed, 13 May 2026 19:09:32 +0200

Newsgroups	dev.linux.lists.x86-cpuid,org.kernel.vger.linux-kernel
Message-ID	<20260513170932.GIagSwTN4oawRCcEYw@fat_crate.local>

On Wed, May 13, 2026 at 06:51:28PM +0200, Borislav Petkov wrote:
> I guess we need to know which leaf changes when a MSR bit is toggled and
> rescan only that leaf alone.

And looking at the current code there:

        /* Disabling the serial number may affect the cpuid level */
        c->cpuid_level = cpuid_eax(0);

So why do you need to rescan leafs at all?

We don't have to do them now...

-- 
Regards/Gruss,
    Boris.

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