[Xen-devel] [PATCH v9 15/23] x86emul: support AVX512_4VNNIW insns

[Jan Beulich <JBeulich@xxxxxxxx>]

As in a few cases before, since the insns here and in particular their
memory access patterns follow the AVX512_4FMAPS scheme, I didn't think
it was necessary to add contrived tests specifically for them, beyond
the Disp8 scaling ones.

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
Acked-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
---
v9: Re-base.
v8: Correct vcpu_has_*() insertion point.
v7: Re-base.
v6: New.

--- a/tools/tests/x86_emulator/evex-disp8.c
+++ b/tools/tests/x86_emulator/evex-disp8.c
@@ -545,6 +545,11 @@ static const struct test avx512_4fmaps_5
      INSN(4fnmaddss, f2, 0f38, ab, el_4, d, vl),
  };
  
+static const struct test avx512_4vnniw_512[] = {
+    INSN(p4dpwssd,  f2, 0f38, 52, el_4, d, vl),
+    INSN(p4dpwssds, f2, 0f38, 53, el_4, d, vl),
+};
+
  static const struct test avx512_bitalg_all[] = {
      INSN(popcnt,      66, 0f38, 54, vl, bw, vl),
      INSN(pshufbitqmb, 66, 0f38, 8f, vl,  b, vl),
@@ -949,6 +954,7 @@ void evex_disp8_test(void *instr, struct
  #define cpu_has_avx512pf cpu_has_avx512f
      RUN(avx512pf, 512);
      RUN(avx512_4fmaps, 512);
+    RUN(avx512_4vnniw, 512);
      RUN(avx512_bitalg, all);
      RUN(avx512_ifma, all);
      RUN(avx512_vbmi, all);
--- a/tools/tests/x86_emulator/x86-emulate.h
+++ b/tools/tests/x86_emulator/x86-emulate.h
@@ -146,6 +146,7 @@ static inline bool xcr0_mask(uint64_t ma
  #define cpu_has_avx512_vbmi2 (cp.feat.avx512_vbmi2 && xcr0_mask(0xe6))
  #define cpu_has_avx512_bitalg (cp.feat.avx512_bitalg && xcr0_mask(0xe6))
  #define cpu_has_avx512_vpopcntdq (cp.feat.avx512_vpopcntdq && xcr0_mask(0xe6))
+#define cpu_has_avx512_4vnniw (cp.feat.avx512_4vnniw && xcr0_mask(0xe6))
  #define cpu_has_avx512_4fmaps (cp.feat.avx512_4fmaps && xcr0_mask(0xe6))
  
  #define cpu_has_xgetbv1   (cpu_has_xsave && cp.xstate.xgetbv1)
--- a/xen/arch/x86/x86_emulate/x86_emulate.c
+++ b/xen/arch/x86/x86_emulate/x86_emulate.c
@@ -479,6 +479,7 @@ static const struct ext0f38_table {
      [0x4d] = { .simd_size = simd_scalar_vexw, .d8s = d8s_dq },
      [0x4e] = { .simd_size = simd_packed_fp, .two_op = 1, .d8s = d8s_vl },
      [0x4f] = { .simd_size = simd_scalar_vexw, .d8s = d8s_dq },
+    [0x52 ... 0x53] = { .simd_size = simd_128, .d8s = 4 },
      [0x54 ... 0x55] = { .simd_size = simd_packed_int, .two_op = 1, .d8s = 
d8s_vl },
      [0x58] = { .simd_size = simd_other, .two_op = 1, .d8s = 2 },
      [0x59] = { .simd_size = simd_other, .two_op = 1, .d8s = 3 },
@@ -1892,6 +1893,7 @@ in_protmode(
  #define vcpu_has_avx512_bitalg() (ctxt->cpuid->feat.avx512_bitalg)
  #define vcpu_has_avx512_vpopcntdq() (ctxt->cpuid->feat.avx512_vpopcntdq)
  #define vcpu_has_rdpid()       (ctxt->cpuid->feat.rdpid)
+#define vcpu_has_avx512_4vnniw() (ctxt->cpuid->feat.avx512_4vnniw)
  #define vcpu_has_avx512_4fmaps() (ctxt->cpuid->feat.avx512_4fmaps)
  
  #define vcpu_must_have(feat) \
@@ -8920,6 +8922,15 @@ x86_emulate(
          generate_exception_if(vex.l, EXC_UD);
          goto simd_0f_avx;
  
+    case X86EMUL_OPC_EVEX_F2(0x0f38, 0x52): /* vp4dpwssd m128,zmm+3,zmm{k} */
+    case X86EMUL_OPC_EVEX_F2(0x0f38, 0x53): /* vp4dpwssds m128,zmm+3,zmm{k} */
+        host_and_vcpu_must_have(avx512_4vnniw);
+        generate_exception_if((ea.type != OP_MEM || evex.w || evex.brs ||
+                               evex.lr != 2),
+                              EXC_UD);
+        op_mask = op_mask & 0xffff ? 0xf : 0;
+        goto simd_zmm;
+
      case X86EMUL_OPC_EVEX_66(0x0f38, 0x8f): /* vpshufbitqmb 
[xyz]mm/mem,[xyz]mm,k{k} */
          generate_exception_if(evex.w || !evex.r || !evex.R || evex.z, EXC_UD);
          /* fall through */
--- a/xen/include/asm-x86/cpufeature.h
+++ b/xen/include/asm-x86/cpufeature.h
@@ -119,6 +119,7 @@
  #define cpu_has_itsc            boot_cpu_has(X86_FEATURE_ITSC)
  
  /* CPUID level 0x00000007:0.edx */
+#define cpu_has_avx512_4vnniw   boot_cpu_has(X86_FEATURE_AVX512_4VNNIW)
  #define cpu_has_avx512_4fmaps   boot_cpu_has(X86_FEATURE_AVX512_4FMAPS)
  #define cpu_has_tsx_force_abort boot_cpu_has(X86_FEATURE_TSX_FORCE_ABORT)
  

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