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Re: [Xen-devel] [PATCH v8 41/50] x86emul: support AVX512_4FMAPS insns


  • To: Jan Beulich <JBeulich@xxxxxxxx>, xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
  • From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
  • Date: Wed, 19 Jun 2019 15:58:13 +0100
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  • Cc: George Dunlap <George.Dunlap@xxxxxxxxxxxxx>, Wei Liu <wei.liu2@xxxxxxxxxx>, Roger Pau Monne <roger.pau@xxxxxxxxxx>
  • Delivery-date: Wed, 19 Jun 2019 14:58:25 +0000
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  • List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
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On 15/03/2019 11:04, Jan Beulich wrote:
> --- a/xen/arch/x86/x86_emulate/x86_emulate.c
> +++ b/xen/arch/x86/x86_emulate/x86_emulate.c
> @@ -1924,6 +1924,7 @@ static bool vcpu_has(
>  #define vcpu_has_avx512_bitalg() vcpu_has(       7, ECX, 12, ctxt, ops)
>  #define vcpu_has_avx512_vpopcntdq() vcpu_has(    7, ECX, 14, ctxt, ops)
>  #define vcpu_has_rdpid()       vcpu_has(         7, ECX, 22, ctxt, ops)
> +#define vcpu_has_avx512_4fmaps() vcpu_has(       7, EDX,  3, ctxt, ops)
>  #define vcpu_has_clzero()      vcpu_has(0x80000008, EBX,  0, ctxt, ops)
>  
>  #define vcpu_must_have(feat) \
> @@ -3205,6 +3206,18 @@ x86_decode(
>                                                     state);
>                      state->simd_size = simd_other;
>                  }
> +
> +                switch ( b )
> +                {
> +                /* v4f{,n}madd{p,s}s need special casing */

Why?  Given that this isn't boilerplate addition of new instructions, it
needs a discussion in the commit message.

~Andrew

> +                case 0x9a: case 0x9b: case 0xaa: case 0xab:
> +                    if ( evex.pfx == vex_f2 )
> +                    {
> +                        disp8scale = 4;
> +                        state->simd_size = simd_128;
> +                    }
> +                    break;
> +                }
>              }
>              break;
>  


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