Re: [PATCH v2 1/1] x86/rdrand: disable RDSEED on AMD Cyan Skillfish

[Dave Hansen]

On 6/17/25 13:05, Borislav Petkov wrote:
> +	/* Disable RDSEED on AMD Cyan Skillfish because of an error. */
> +	if (c->x86_model == 0x47 && c->x86_stepping == 0x0) {
> +		clear_cpu_cap(c, X86_FEATURE_RDSEED);
> +		msr_clear_bit(MSR_AMD64_CPUID_FN_7, 18);
> +		pr_emerg("RDSEED is not reliable on this platform; disabling.\n");
> +	}

Heh, maybe if x86_init_rdrand() did RDSEED too, this wouldn't have
slipped through QA.