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Re: [Xen-devel] [PATCH v8 28/50] x86emul: support AVX512F floating point manipulation insns


  • To: Jan Beulich <JBeulich@xxxxxxxx>, xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
  • From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
  • Date: Wed, 29 May 2019 05:51:08 -0700
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  • Cc: George Dunlap <George.Dunlap@xxxxxxxxxxxxx>, Wei Liu <wei.liu2@xxxxxxxxxx>, Roger Pau Monne <roger.pau@xxxxxxxxxx>
  • Delivery-date: Wed, 29 May 2019 12:51:19 +0000
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  • List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
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On 15/03/2019 10:56, Jan Beulich wrote:
> @@ -9681,6 +9696,21 @@ x86_emulate(
>          op_bytes = 4;
>          goto simd_imm8_zmm;
>  
> +    case X86EMUL_OPC_EVEX_66(0x0f3a, 0x26): /* vgetmantp{s,d} 
> $imm8,[xyz]mm/mem,[xyz]mm{k} */
> +    case X86EMUL_OPC_EVEX_66(0x0f3a, 0x54): /* vfixupimmp{s,d} 
> $imm8,[xyz]mm/mem,[xyz]mm,[xyz]mm{k} */
> +        host_and_vcpu_must_have(avx512f);
> +        if ( ea.type != OP_REG || !evex.brs )
> +            avx512_vlen_check(false);
> +        goto simd_imm8_zmm;
> +
> +    case X86EMUL_OPC_EVEX_66(0x0f3a, 0x27): /* vgetmants{s,d} 
> $imm8,xmm/mem,xmm,xmm{k} */
> +    case X86EMUL_OPC_EVEX_66(0x0f3a, 0x55): /* vfixupimms{s,d} 
> $imm8,xmm/mem,xmm,xmm{k} */
> +        host_and_vcpu_must_have(avx512f);
> +        generate_exception_if(ea.type != OP_REG && evex.brs, EXC_UD);

Why the ea.type != OP_REG restriction?  These four instructions do take
memory operands.

~Andrew

> +        if ( !evex.brs )
> +            avx512_vlen_check(true);
> +        goto simd_imm8_zmm;
> +
>      case X86EMUL_OPC_VEX_66(0x0f3a, 0x30): /* kshiftr{b,w} $imm8,k,k */
>      case X86EMUL_OPC_VEX_66(0x0f3a, 0x32): /* kshiftl{b,w} $imm8,k,k */
>          if ( !vex.w )
>
>
>


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