From: Jan Beulich <jbeulich@suse.com>
Date: Fri, 16 Dec 2016 13:37:11 +0000 (+0100)
Subject: x86emul: CMPXCHG16B requires an aligned operand
X-Git-Tag: archive/raspbian/4.11.1-1+rpi1~1^2~66^2~3116
X-Git-Url: https://dgit.raspbian.org/?a=commitdiff_plain;h=d7d3a82c28a1102ee6c9707071a946164bae0d57;p=xen.git

x86emul: CMPXCHG16B requires an aligned operand

This distinguishes it from CMPXCHG8B.

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com>
---

diff --git a/xen/arch/x86/x86_emulate/x86_emulate.c b/xen/arch/x86/x86_emulate/x86_emulate.c
index 921933c11c..6313b57bf8 100644
--- a/xen/arch/x86/x86_emulate/x86_emulate.c
+++ b/xen/arch/x86/x86_emulate/x86_emulate.c
@@ -5413,6 +5413,9 @@ 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