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Re: [Xen-devel] [PATCH] x86emul: add support for missing {, V}PMADDWD insns


  • To: Jan Beulich <JBeulich@xxxxxxxx>, xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
  • From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
  • Date: Wed, 15 May 2019 11:17:50 +0100
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  • Cc: Wei Liu <wei.liu2@xxxxxxxxxx>, Razvan Cojocaru <rcojocaru@xxxxxxxxxxxxxxx>, Roger Pau Monne <roger.pau@xxxxxxxxxx>
  • Delivery-date: Wed, 15 May 2019 10:18:04 +0000
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On 15/05/2019 09:23, Jan Beulich wrote:
> Their pre-AVX512 incarnations have clearly been overlooked during much
> earlier work. Their memory access pattern is entirely standard, so no
> specific tests get added to the harness.
>
> Reported-by: Razvan Cojocaru <rcojocaru@xxxxxxxxxxxxxxx>
> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
>
> --- a/xen/arch/x86/x86_emulate/x86_emulate.c
> +++ b/xen/arch/x86/x86_emulate/x86_emulate.c
> @@ -6624,6 +6624,8 @@ x86_emulate(
>      case X86EMUL_OPC_VEX_66(0x0f, 0xf3): /* vpsllq xmm/m128,{x,y}mm,{x,y}mm 
> */
>      case X86EMUL_OPC_66(0x0f, 0xf4):     /* pmuludq xmm/m128,xmm */
>      case X86EMUL_OPC_VEX_66(0x0f, 0xf4): /* vpmuludq 
> {x,y}mm/mem,{x,y}mm,{x,y}mm */
> +    CASE_SIMD_PACKED_INT(0x0f, 0xf5):    /* pmaddwd {,x}mm/mem,{,x}mm */
> +    case X86EMUL_OPC_VEX_66(0x0f, 0xf5): /* vpmaddwd 
> {x,y}mm/mem,{x,y}mm,{x,y}mm */

Nothing on this path checks for SSSE3, AFAICT.

~Andrew

>      case X86EMUL_OPC_66(0x0f, 0xf6):     /* psadbw xmm/m128,xmm */
>      case X86EMUL_OPC_VEX_66(0x0f, 0xf6): /* vpsadbw 
> {x,y}mm/mem,{x,y}mm,{x,y}mm */
>      CASE_SIMD_PACKED_INT(0x0f, 0xf8):    /* psubb {,x}mm/mem,{,x}mm */
>
>


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