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

[Luc, Piotr]

On Sat, 2016-10-29 at 08:21 -0400, Paolo Bonzini wrote:
> 
> Currently none of the bits in CPUID[7,0].edx is ever masked by the
> host, so
> this would be enough.ÂÂIf we ever need to do some masking, I guess
> I'll
> practice my puss-in-boots look and submit a patch to add CPUID[7,0]
> back
> as a separate cpufeature entr.

I think that in v4.9-rc2 theÂCPUID[7,0].edx bits can be masked out by
applying noxsave to cmdline. Using directly cpu_count will result in
passing the bits in edx to a guest directly while the xsaveopt and rest
of AVX512 features bits will be cleared.Â

Thx
Piotr