Re: [PATCH] x86/microcode/AMD: Limit Entrysign signature checking to known generations

[Andrew Cooper]

> Limit Entrysign sha256 signature checking to CPUs in the range Zen1-Zen5.
>
> ...
> +static bool cpu_has_entrysign(void) +{ + unsigned int fam =
> x86_family(bsp_cpuid_1_eax); + unsigned int model =
> x86_model(bsp_cpuid_1_eax); + + if (fam == 0x17) + return true; + + if
> (fam == 0x19) { + if (model <= 0x2f || + (0x40 <= model && model <=
> 0x4f) || + (0x60 <= model && model <= 0x6f)) + return true; + } + +
> return false; +}

That's Zen1-3.  It's Fam 0x1a you need to split to separate Zen5 and 6.

~Andrew