[Xen-devel] x86_emulate(): Upon LOCK prefix for MOV, should inject #UD rather than #GP?

["Liu, Eric E" <eric.e.liu@xxxxxxxxx>]

Hi all,
        The Intel SDM(2A) says that if the LOCK prefix is used with some
instructions such as "mov" and the souce  operand is a memory operand, a
#UD may be generated, but in the x86_emulate.c there are places such as
:
             942     /* Lock prefix is allowed only on RMW instructions.
*/
             943     generate_exception_if((d & Mov) && lock_prefix,
EXC_GP);
here we inject EXC_GP but not EXC_UD, is it a bug?

--Eric (Liu, Feng)

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