Messages in this thread | | | Date | Mon, 31 Oct 2016 11:30:50 +0100 | From | Borislav Petkov <> | Subject | Re: [PATCH] x86/cpuid: expose AVX512_4VNNIW and AVX512_4FMAPS features to kvm guest |
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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.
ECO tip #101: Trim your mails when you reply.
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