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charset="utf-8" Element size for this opcode depends on EVEX.W, not the low opcode bit. Make use of AVX512BW being a prereq to AVX512_BITALG and move the case label there, adding an AVX512BW feature check. Signed-off-by: Jan Beulich Reviewed-by: Andrew Cooper --- a/xen/arch/x86/x86_emulate/x86_emulate.c +++ b/xen/arch/x86/x86_emulate/x86_emulate.c @@ -7401,7 +7401,6 @@ x86_emulate( case X86EMUL_OPC_EVEX_66(0x0f38, 0x0b): /* vpmulhrsw [xyz]mm/mem,[xyz]= mm,[xyz]mm{k} */ case X86EMUL_OPC_EVEX_66(0x0f38, 0x1c): /* vpabsb [xyz]mm/mem,[xyz]mm{= k} */ case X86EMUL_OPC_EVEX_66(0x0f38, 0x1d): /* vpabsw [xyz]mm/mem,[xyz]mm{= k} */ - case X86EMUL_OPC_EVEX_66(0x0f38, 0x66): /* vpblendm{b,w} [xyz]mm/mem,[= xyz]mm,[xyz]mm{k} */ host_and_vcpu_must_have(avx512bw); generate_exception_if(evex.brs, EXC_UD); elem_bytes =3D 1 << (b & 1); @@ -9558,6 +9557,9 @@ x86_emulate( /* fall through */ case X86EMUL_OPC_EVEX_66(0x0f38, 0x54): /* vpopcnt{b,w} [xyz]mm/mem,[x= yz]mm{k} */ host_and_vcpu_must_have(avx512_bitalg); + /* fall through */ + case X86EMUL_OPC_EVEX_66(0x0f38, 0x66): /* vpblendm{b,w} [xyz]mm/mem,[= xyz]mm,[xyz]mm{k} */ + host_and_vcpu_must_have(avx512bw); generate_exception_if(evex.brs, EXC_UD); elem_bytes =3D 1 << evex.w; goto avx512f_no_sae;