[Xen-devel] [PATCH v2 3/3] x86emul: CMPXCHG16B requires an aligned operand

["Jan Beulich" <JBeulich@xxxxxxxx>]

This distinguishes it from CMPXCHG8B.

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
@@ -5372,6 +5372,9 @@ x86_emulate(
         if ( rex_prefix & REX_W )
         {
             host_and_vcpu_must_have(cx16);
+            generate_exception_if(!is_aligned(ea.mem.seg, ea.mem.off, 16,
+                                              ctxt, ops),
+                                  EXC_GP, 0);
             op_bytes = 16;
         }
         else

Attachment: x86emul-CMPXCHG16B-alignment.patch
Description: Text document

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