[Xen-changelog] [xen stable-4.8] x86emul: LOCK check adjustments

[patchbot@xxxxxxx]

commit ba7e250cc48d068b3777ffddc2bb8b2f43d05e53
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Thu Feb 9 10:22:28 2017 +0100
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Thu Feb 9 10:22:28 2017 +0100

    x86emul: LOCK check adjustments
    
    BT, being encoded as DstBitBase just like BT{C,R,S}, nevertheless does
    not write its (register or memory) operand and hence also doesn't allow
    a LOCK prefix to be used.
    
    Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
    Reviewed-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
    master commit: f2d4f4ba80de8a03a1b0f300d271715a88a8433d
    master date: 2017-01-20 14:37:33 +0100
---
 xen/arch/x86/x86_emulate/x86_emulate.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/xen/arch/x86/x86_emulate/x86_emulate.c 
b/xen/arch/x86/x86_emulate/x86_emulate.c
index 651506c..8e9d36c 100644
--- a/xen/arch/x86/x86_emulate/x86_emulate.c
+++ b/xen/arch/x86/x86_emulate/x86_emulate.c
@@ -5065,6 +5065,7 @@ x86_emulate(
     }
 
     case X86EMUL_OPC(0x0f, 0xa3): bt: /* bt */
+        generate_exception_if(lock_prefix, EXC_UD, 0);
         emulate_2op_SrcV_nobyte("bt", src, dst, _regs.eflags);
         dst.type = OP_NONE;
         break;
--
generated by git-patchbot for /home/xen/git/xen.git#stable-4.8

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