Messages in this thread | | | Subject | Re: [PATCH] x86/cpuid: expose AVX512_4VNNIW and AVX512_4FMAPS features to kvm guest | From | Paolo Bonzini <> | Date | Fri, 28 Oct 2016 11:31:05 +0200 |
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On 28/10/2016 11:12, He Chen wrote: > The spec can be found in Intel Software Developer Manual or in > Instruction Set Extensions Programming Reference. > > Signed-off-by: Luwei Kang <luwei.kang@intel.com> > Signed-off-by: He Chen <he.chen@linux.intel.com> > --- > arch/x86/kvm/cpuid.c | 7 ++++++- > 1 file changed, 6 insertions(+), 1 deletion(-) > > diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c > index afa7bbb..328b169 100644 > --- a/arch/x86/kvm/cpuid.c > +++ b/arch/x86/kvm/cpuid.c > @@ -376,6 +376,10 @@ static inline int __do_cpuid_ent(struct kvm_cpuid_entry2 *entry, u32 function, > /* cpuid 7.0.ecx*/ > const u32 kvm_cpuid_7_0_ecx_x86_features = F(PKU) | 0 /*OSPKE*/; > > + /* cpuid 7.0.edx*/ > + const u32 kvm_cpuid_7_0_edx_x86_features = > + 0x4 /* AVX512-4VNNIW */ | 0x8 /* AVX512-4FMAPS */;
Please define the new features in cpufeature.h first.
Thanks,
Paolo
> /* all calls to cpuid_count() should be made on the same cpu */ > get_cpu(); > > @@ -458,12 +462,13 @@ static inline int __do_cpuid_ent(struct kvm_cpuid_entry2 *entry, u32 function, > /* PKU is not yet implemented for shadow paging. */ > if (!tdp_enabled) > entry->ecx &= ~F(PKU); > + entry->edx &= kvm_cpuid_7_0_edx_x86_features; > } else { > entry->ebx = 0; > entry->ecx = 0; > + entry->edx = 0; > } > entry->eax = 0; > - entry->edx = 0; > break; > } > case 9: >
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