[xen stable-4.16] x86emul: fix VPBLENDMW with mask and memory operand

[patchbot@xxxxxxx]

commit 0941d6cb2383c4e87d7f53f1df74e8850e1649bc
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Wed Feb 16 15:54:12 2022 +0100
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Wed Feb 16 15:54:12 2022 +0100

    x86emul: fix VPBLENDMW with mask and memory operand
    
    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 <jbeulich@xxxxxxxx>
    Reviewed-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
    master commit: eddf13b5e9401f6871dcce1ce61c80cff62079ed
    master date: 2022-02-14 10:08:38 +0100
---
 xen/arch/x86/x86_emulate/x86_emulate.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/xen/arch/x86/x86_emulate/x86_emulate.c 
b/xen/arch/x86/x86_emulate/x86_emulate.c
index f71015ffa1..e3667cb1a3 100644
--- 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 = 1 << (b & 1);
@@ -9558,6 +9557,9 @@ x86_emulate(
         /* fall through */
     case X86EMUL_OPC_EVEX_66(0x0f38, 0x54): /* vpopcnt{b,w} 
[xyz]mm/mem,[xyz]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 = 1 << evex.w;
         goto avx512f_no_sae;
--
generated by git-patchbot for /home/xen/git/xen.git#stable-4.16