[Xen-devel] [PATCH] x86emul: don't read mask register on AVX512F-incapable platforms

["Jan Beulich" <JBeulich@xxxxxxxx>]

Reported-by: George Dunlap <george.dunlap@xxxxxxxxxx>
Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
---
This is surely a stable tree candidate, unless it could still make it
into 4.12 before the release.

--- a/xen/arch/x86/x86_emulate/x86_emulate.c
+++ b/xen/arch/x86/x86_emulate/x86_emulate.c
@@ -3511,7 +3511,7 @@ x86_emulate(
     }
 
     /* With a memory operand, fetch the mask register in use (if any). */
-    if ( ea.type == OP_MEM && evex.opmsk )
+    if ( ea.type == OP_MEM && cpu_has_avx512f && evex.opmsk )
     {
         uint8_t *stb = get_stub(stub);
 



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