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

From Paolo Bonzini <pbonzini@redhat.com>
Newsgroups linux.kernel
Subject Re: [PATCH] x86/cpuid: expose AVX512_4VNNIW and AVX512_4FMAPS features to kvm guest
Date 2016-10-28 14:10 +0200
Message-ID <sxe8W-885-21@gated-at.bofh.it> (permalink)
References <sxbup-6lx-17@gated-at.bofh.it> <sxcqt-6Y9-11@gated-at.bofh.it> <sxcqt-6Y9-21@gated-at.bofh.it> <sxdcR-7xJ-29@gated-at.bofh.it>
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On 28/10/2016 13:08, Borislav Petkov wrote:
> On Fri, Oct 28, 2016 at 12:17:02PM +0200, Paolo Bonzini wrote:
>> Otherwise, if you add a cpuid_count_edx function to processor.h then one
>> can do:
>>
>> 	entry_>edx &= cpuid_count_edx(7, 0);
>>
>> which is decent too.
> 
> If you think of iterating over the cpuid_bits[] array and recreating the
> CPUID leaf for KVM, sure, why not...
> 

cpuid_count_edx would be just

static inline unsigned int cpuid_count_edx(unsigned op, unsigned count)
{
        unsigned int eax, ebx, ecx, edx;

        cpuid_count(op, count, &eax, &ebx, &ecx, &edx);

        return edx;
}

Paolo

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[PATCH] x86/cpuid: expose AVX512_4VNNIW and AVX512_4FMAPS features to kvm guest He Chen <he.chen@linux.intel.com> - 2016-10-28 11:20 +0200
  Re: [PATCH] x86/cpuid: expose AVX512_4VNNIW and AVX512_4FMAPS  features to kvm guest Paolo Bonzini <pbonzini@redhat.com> - 2016-10-28 11:40 +0200
    Re: [PATCH] x86/cpuid: expose AVX512_4VNNIW and AVX512_4FMAPS  features to kvm guest He Chen <he.chen@linux.intel.com> - 2016-10-28 11:50 +0200
      Re: [PATCH] x86/cpuid: expose AVX512_4VNNIW and AVX512_4FMAPS  features to kvm guest He Chen <he.chen@linux.intel.com> - 2016-10-28 12:00 +0200
      Re: [PATCH] x86/cpuid: expose AVX512_4VNNIW and AVX512_4FMAPS  features to kvm guest Paolo Bonzini <pbonzini@redhat.com> - 2016-10-28 12:00 +0200
  Re: [PATCH] x86/cpuid: expose AVX512_4VNNIW and AVX512_4FMAPS  features to kvm guest "Luc, Piotr" <Piotr.Luc@intel.com> - 2016-10-28 12:20 +0200
    Re: [PATCH] x86/cpuid: expose AVX512_4VNNIW and AVX512_4FMAPS  features to kvm guest Paolo Bonzini <pbonzini@redhat.com> - 2016-10-28 12:20 +0200
      Re: [PATCH] x86/cpuid: expose AVX512_4VNNIW and AVX512_4FMAPS  features to kvm guest Borislav Petkov <bp@alien8.de> - 2016-10-28 13:10 +0200
        Re: [PATCH] x86/cpuid: expose AVX512_4VNNIW and AVX512_4FMAPS  features to kvm guest Paolo Bonzini <pbonzini@redhat.com> - 2016-10-28 14:10 +0200
          Re: [PATCH] x86/cpuid: expose AVX512_4VNNIW and AVX512_4FMAPS  features to kvm guest Borislav Petkov <bp@alien8.de> - 2016-10-28 14:30 +0200
            Re: [PATCH] x86/cpuid: expose AVX512_4VNNIW and AVX512_4FMAPS  features to kvm guest Borislav Petkov <bp@alien8.de> - 2016-10-29 14:30 +0200
              Re: [PATCH] x86/cpuid: expose AVX512_4VNNIW and AVX512_4FMAPS  features to kvm guest Paolo Bonzini <pbonzini@redhat.com> - 2016-10-29 14:50 +0200
                Re: [PATCH] x86/cpuid: expose AVX512_4VNNIW and AVX512_4FMAPS  features to kvm guest Borislav Petkov <bp@alien8.de> - 2016-10-29 15:00 +0200
                Re: [PATCH] x86/cpuid: expose AVX512_4VNNIW and AVX512_4FMAPS  features to kvm guest Paolo Bonzini <pbonzini@redhat.com> - 2016-10-29 15:30 +0200
            Re: [PATCH] x86/cpuid: expose AVX512_4VNNIW and AVX512_4FMAPS  features to kvm guest Paolo Bonzini <pbonzini@redhat.com> - 2016-10-29 14:30 +0200
              Re: [PATCH] x86/cpuid: expose AVX512_4VNNIW and AVX512_4FMAPS  features to kvm guest "Luc, Piotr" <Piotr.Luc@intel.com> - 2016-10-31 10:20 +0100
                Re: [PATCH] x86/cpuid: expose AVX512_4VNNIW and AVX512_4FMAPS  features to kvm guest Borislav Petkov <bp@alien8.de> - 2016-10-31 11:00 +0100
                Re: [PATCH] x86/cpuid: expose AVX512_4VNNIW and AVX512_4FMAPS  features to kvm guest "Luc, Piotr" <Piotr.Luc@intel.com> - 2016-10-31 11:20 +0100
                Re: [PATCH] x86/cpuid: expose AVX512_4VNNIW and AVX512_4FMAPS  features to kvm guest Borislav Petkov <bp@alien8.de> - 2016-10-31 11:40 +0100
                Re: [PATCH] x86/cpuid: expose AVX512_4VNNIW and AVX512_4FMAPS  features to kvm guest Paolo Bonzini <pbonzini@redhat.com> - 2016-10-31 11:50 +0100
                Re: [PATCH] x86/cpuid: expose AVX512_4VNNIW and AVX512_4FMAPS  features to kvm guest Borislav Petkov <bp@alien8.de> - 2016-10-31 12:10 +0100
                Re: [PATCH] x86/cpuid: expose AVX512_4VNNIW and AVX512_4FMAPS  features to kvm guest Paolo Bonzini <pbonzini@redhat.com> - 2016-10-31 12:50 +0100
                Re: [PATCH] x86/cpuid: expose AVX512_4VNNIW and AVX512_4FMAPS  features to kvm guest He Chen <he.chen@linux.intel.com> - 2016-11-01 08:50 +0100
                Re: [PATCH] x86/cpuid: expose AVX512_4VNNIW and AVX512_4FMAPS  features to kvm guest Borislav Petkov <bp@alien8.de> - 2016-11-01 09:50 +0100

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