Re: [PATCH] x86/cpuid: expose AVX512_4VNNIW and AVX512_4FMAPS features to kvm guest

[Borislav Petkov]

On Mon, Oct 31, 2016 at 10:18:41AM +0000, Luc, Piotr wrote:
> The cpuid_mask function, which usually used in kvm, read bit from this
> x86_capabity and mask out. This prevents passing disabled features to
> guest. If we use cpu_count instead, which reports bits directly from

Ah, you mean cpuid_count().

> CPU, then the bits of features that are disabled in host are passed to
> guest as enabled. This seems be inconsistent.

Ok, I see what you mean.

So I guess we'll have to iterate over the cpuid_bits[] array and
recreate the CPUID leaf for KVM instead, as I suggested earlier.

-- 
Regards/Gruss,
    Boris.

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