Re: [PATCH] x86/CPU/AMD: Clear RDRAND CPUID if Built-In-Self-Test failed on boot

[Borislav Petkov]

On Tue, Apr 28, 2026 at 06:35:31PM +0100, Dmitry Safonov via B4 Relay wrote:
> Yet, CPUID gets cleared only for previously known broken
> implementations, see i.e., commit c49a0a80137c ("x86/CPU/AMD: Clear
> RDRAND CPUID bit on AMD family 15h/16h"), that disabled RDRAND on
> the same CPU family, where it was broken only after suspend-resume.
> 
> As RDRAND is not masked in CPUID, some userspace may attempt using it,

So why aren't you clearing the MSR bit even if our internal X86_FEATURE
representation is cleared?

-- 
Regards/Gruss,
    Boris.

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